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freebsd-dev/sys/netinet/in_pcb.c

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/* -> /*- for license, minor formatting changes
2005-01-07 01:45:51 +00:00
/*-
sys: further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
2017-11-20 19:43:44 +00:00
* SPDX-License-Identifier: BSD-3-Clause
*
Merge 4.4-Lite-2: use M_NOWAIT in in_pcballoc(), and return EACCES rather than EPERM on illegal attempt to bind a reserved port. Obtained from: 4.4BSD-Lite-2
1995-09-21 17:55:49 +00:00
* Copyright (c) 1982, 1986, 1991, 1993, 1995
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
* The Regents of the University of California.
Add INP_INHASHLIST flag for inpcb->inp_flags to indicate whether or not the inpcb is currenty on various hash lookup lists, rather than using (lport != 0) to detect this. This means that the full 4-tuple of a connection can be retained after close, which should lead to more sensible netstat output in the window between TCP close and socket close. MFC after: 2 weeks
2009-03-11 00:29:22 +00:00
* Copyright (c) 2007-2009 Robert N. M. Watson
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
* Copyright (c) 2010-2011 Juniper Networks, Inc.
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
* All rights reserved.
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
*
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
* Portions of this software were developed by Robert N. M. Watson under
* contract to Juniper Networks, Inc.
*
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
Renumber copyright clause 4 Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00
* 3. Neither the name of the University nor the names of its contributors
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
Merge 4.4-Lite-2: use M_NOWAIT in in_pcballoc(), and return EACCES rather than EPERM on illegal attempt to bind a reserved port. Obtained from: 4.4BSD-Lite-2
1995-09-21 17:55:49 +00:00
* @(#)in_pcb.c 8.4 (Berkeley) 5/24/95
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
*/
Add FBSDID to all files in netinet so that people can more easily include file version information in bug reports. Approved by: re (kensmith)
2007-10-07 20:44:24 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
#include "opt_ddb.h"
IPSEC support in the kernel. pr_input() routines prototype is also changed to support IPSEC and IPV6 chained protocol headers. Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-22 19:13:38 +00:00
#include "opt_ipsec.h"
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
#include "opt_inet.h"
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#include "opt_inet6.h"
Implement kernel support for hardware rate limited sockets. - Add RATELIMIT kernel configuration keyword which must be set to enable the new functionality. - Add support for hardware driven, Receive Side Scaling, RSS aware, rate limited sendqueues and expose the functionality through the already established SO_MAX_PACING_RATE setsockopt(). The API support rates in the range from 1 to 4Gbytes/s which are suitable for regular TCP and UDP streams. The setsockopt(2) manual page has been updated. - Add rate limit function callback API to "struct ifnet" which supports the following operations: if_snd_tag_alloc(), if_snd_tag_modify(), if_snd_tag_query() and if_snd_tag_free(). - Add support to ifconfig to view, set and clear the IFCAP_TXRTLMT flag, which tells if a network driver supports rate limiting or not. - This patch also adds support for rate limiting through VLAN and LAGG intermediate network devices. - How rate limiting works: 1) The userspace application calls setsockopt() after accepting or making a new connection to set the rate which is then stored in the socket structure in the kernel. Later on when packets are transmitted a check is made in the transmit path for rate changes. A rate change implies a non-blocking ifp->if_snd_tag_alloc() call will be made to the destination network interface, which then sets up a custom sendqueue with the given rate limitation parameter. A "struct m_snd_tag" pointer is returned which serves as a "snd_tag" hint in the m_pkthdr for the subsequently transmitted mbufs. 2) When the network driver sees the "m->m_pkthdr.snd_tag" different from NULL, it will move the packets into a designated rate limited sendqueue given by the snd_tag pointer. It is up to the individual drivers how the rate limited traffic will be rate limited. 3) Route changes are detected by the NIC drivers in the ifp->if_transmit() routine when the ifnet pointer in the incoming snd_tag mismatches the one of the network interface. The network adapter frees the mbuf and returns EAGAIN which causes the ip_output() to release and clear the send tag. Upon next ip_output() a new "snd_tag" will be tried allocated. 4) When the PCB is detached the custom sendqueue will be released by a non-blocking ifp->if_snd_tag_free() call to the currently bound network interface. Reviewed by: wblock (manpages), adrian, gallatin, scottl (network) Differential Revision: https://reviews.freebsd.org/D3687 Sponsored by: Mellanox Technologies MFC after: 3 months
2017-01-18 13:31:17 +00:00
#include "opt_ratelimit.h"
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#include "opt_pcbgroup.h"
Several years after initial development, merge prototype support for linking NIC Receive Side Scaling (RSS) to the network stack's connection-group implementation. This prototype (and derived patches) are in use at Juniper and several other FreeBSD-using companies, so despite some reservations about its maturity, merge the patch to the base tree so that it can be iteratively refined in collaboration rather than maintained as a set of gradually diverging patch sets. (1) Merge a software implementation of the Toeplitz hash specified in RSS implemented by David Malone. This is used to allow suitable pcbgroup placement of connections before the first packet is received from the NIC. Software hashing is generally avoided, however, due to high cost of the hash on general-purpose CPUs. (2) In in_rss.c, maintain authoritative versions of RSS state intended to be pushed to each NIC, including keying material, hash algorithm/ configuration, and buckets. Provide software-facing interfaces to hash 2- and 4-tuples for IPv4 and IPv6 using both the RSS standardised Toeplitz and a 'naive' variation with a hash efficient in software but with poor distribution properties. Implement rss_m2cpuid()to be used by netisr and other load balancing code to look up the CPU on which an mbuf should be processed. (3) In the Ethernet link layer, allow netisr distribution using RSS as a source of policy as an alternative to source ordering; continue to default to direct dispatch (i.e., don't try and requeue packets for processing on the 'right' CPU if they arrive in a directly dispatchable context). (4) Allow RSS to control tuning of connection groups in order to align groups with RSS buckets. If a packet arrives on a protocol using connection groups, and contains a suitable hardware-generated hash, use that hash value to select the connection group for pcb lookup for both IPv4 and IPv6. If no hardware-generated Toeplitz hash is available, we fall back on regular PCB lookup risking contention rather than pay the cost of Toeplitz in software -- this is a less scalable but, at my last measurement, faster approach. As core counts go up, we may want to revise this strategy despite CPU overhead. Where device drivers suitably configure NICs, and connection groups / RSS are enabled, this should avoid both lock and line contention during connection lookup for TCP. This commit does not modify any device drivers to tune device RSS configuration to the global RSS configuration; patches are in circulation to do this for at least Chelsio T3 and Intel 1G/10G drivers. Currently, the KPI for device drivers is not particularly robust, nor aware of more advanced features such as runtime reconfiguration/rebalancing. This will hopefully prove a useful starting point for refinement. No MFC is scheduled as we will first want to nail down a more mature and maintainable KPI/KBI for device drivers. Sponsored by: Juniper Networks (original work) Sponsored by: EMC/Isilon (patch update and merge)
2014-03-15 00:57:50 +00:00
#include "opt_rss.h"
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/param.h>
#include <sys/systm.h>
Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. Both are used to protect access to IP addresses lists and they can be acquired for reading several times per packet. To reduce lock contention it is better to use rmlock here. Reviewed by: gnn (previous version) Obtained from: Yandex LLC Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D3149
2015-07-29 08:12:05 +00:00
#include <sys/lock.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/malloc.h>
#include <sys/mbuf.h>
MFp4 CH=191470: Move the ipport_tick_callout and related functions from ip_input.c to in_pcb.c. The random source port allocation code has been merged and is now local to in_pcb.c only. Use a SYSINIT to get the callout started and no longer depend on initialization from the inet code, which would not work in an IPv6 only setup. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-20 08:00:29 +00:00
#include <sys/callout.h>
Remove sys/eventhandler.h from net/route.h Reviewed by: ae
2016-01-09 09:34:39 +00:00
#include <sys/eventhandler.h>
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#include <sys/domain.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/protosw.h>
Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. Both are used to protect access to IP addresses lists and they can be acquired for reading several times per packet. To reduce lock contention it is better to use rmlock here. Reviewed by: gnn (previous version) Obtained from: Yandex LLC Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D3149
2015-07-29 08:12:05 +00:00
#include <sys/rmlock.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/socket.h>
#include <sys/socketvar.h>
Implement kernel support for hardware rate limited sockets. - Add RATELIMIT kernel configuration keyword which must be set to enable the new functionality. - Add support for hardware driven, Receive Side Scaling, RSS aware, rate limited sendqueues and expose the functionality through the already established SO_MAX_PACING_RATE setsockopt(). The API support rates in the range from 1 to 4Gbytes/s which are suitable for regular TCP and UDP streams. The setsockopt(2) manual page has been updated. - Add rate limit function callback API to "struct ifnet" which supports the following operations: if_snd_tag_alloc(), if_snd_tag_modify(), if_snd_tag_query() and if_snd_tag_free(). - Add support to ifconfig to view, set and clear the IFCAP_TXRTLMT flag, which tells if a network driver supports rate limiting or not. - This patch also adds support for rate limiting through VLAN and LAGG intermediate network devices. - How rate limiting works: 1) The userspace application calls setsockopt() after accepting or making a new connection to set the rate which is then stored in the socket structure in the kernel. Later on when packets are transmitted a check is made in the transmit path for rate changes. A rate change implies a non-blocking ifp->if_snd_tag_alloc() call will be made to the destination network interface, which then sets up a custom sendqueue with the given rate limitation parameter. A "struct m_snd_tag" pointer is returned which serves as a "snd_tag" hint in the m_pkthdr for the subsequently transmitted mbufs. 2) When the network driver sees the "m->m_pkthdr.snd_tag" different from NULL, it will move the packets into a designated rate limited sendqueue given by the snd_tag pointer. It is up to the individual drivers how the rate limited traffic will be rate limited. 3) Route changes are detected by the NIC drivers in the ifp->if_transmit() routine when the ifnet pointer in the incoming snd_tag mismatches the one of the network interface. The network adapter frees the mbuf and returns EAGAIN which causes the ip_output() to release and clear the send tag. Upon next ip_output() a new "snd_tag" will be tried allocated. 4) When the PCB is detached the custom sendqueue will be released by a non-blocking ifp->if_snd_tag_free() call to the currently bound network interface. Reviewed by: wblock (manpages), adrian, gallatin, scottl (network) Differential Revision: https://reviews.freebsd.org/D3687 Sponsored by: Mellanox Technologies MFC after: 3 months
2017-01-18 13:31:17 +00:00
#include <sys/sockio.h>
Sweep kernel replacing suser(9) calls with priv(9) calls, assigning specific privilege names to a broad range of privileges. These may require some future tweaking. Sponsored by: nCircle Network Security, Inc. Obtained from: TrustedBSD Project Discussed on: arch@ Reviewed (at least in part) by: mlaier, jmg, pjd, bde, ceri, Alex Lyashkov <umka at sevcity dot net>, Skip Ford <skip dot ford at verizon dot net>, Antoine Brodin <antoine dot brodin at laposte dot net>
2006-11-06 13:42:10 +00:00
#include <sys/priv.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/proc.h>
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
#include <sys/refcount.h>
This Implements the mumbled about "Jail" feature. This is a seriously beefed up chroot kind of thing. The process is jailed along the same lines as a chroot does it, but with additional tough restrictions imposed on what the superuser can do. For all I know, it is safe to hand over the root bit inside a prison to the customer living in that prison, this is what it was developed for in fact: "real virtual servers". Each prison has an ip number associated with it, which all IP communications will be coerced to use and each prison has its own hostname. Needless to say, you need more RAM this way, but the advantage is that each customer can run their own particular version of apache and not stomp on the toes of their neighbors. It generally does what one would expect, but setting up a jail still takes a little knowledge. A few notes: I have no scripts for setting up a jail, don't ask me for them. The IP number should be an alias on one of the interfaces. mount a /proc in each jail, it will make ps more useable. /proc/<pid>/status tells the hostname of the prison for jailed processes. Quotas are only sensible if you have a mountpoint per prison. There are no privisions for stopping resource-hogging. Some "#ifdef INET" and similar may be missing (send patches!) If somebody wants to take it from here and develop it into more of a "virtual machine" they should be most welcome! Tools, comments, patches & documentation most welcome. Have fun... Sponsored by: http://www.rndassociates.com/ Run for almost a year by: http://www.servetheweb.com/
1999-04-28 11:38:52 +00:00
#include <sys/jail.h>
Change the default local address range for IP from 1024 through 5000 to 20000 through 30000. These numbers are used for local IP port numbers when an explicit address is not specified. The values are sysctl modifiable under: net.inet.ip.port_{first|last}_auto These numbers do not overlap with any known server addresses, without going above 32768 which are "negative" on some other implementations. 20000 through 30000 is 2.5 times larger than the old range, but some have suggested even that may not be enough... (gasp!) Setting a low address of 10000 should be plenty.. :-)
1996-01-19 08:00:58 +00:00
#include <sys/kernel.h>
#include <sys/sysctl.h>
Fixed style bugs (mostly) in previous commit.
1998-03-28 10:18:26 +00:00
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
#ifdef DDB
#include <ddb/ddb.h>
#endif
Switch vm_zone.h with uma.h. Change over to uma interfaces.
2002-03-20 05:48:55 +00:00
#include <vm/uma.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <net/if.h>
The r48589 promised to remove implicit inclusion of if_var.h soon. Prepare to this event, adding if_var.h to files that do need it. Also, include all includes that now are included due to implicit pollution via if_var.h Sponsored by: Netflix Sponsored by: Nginx, Inc.
2013-10-26 17:58:36 +00:00
#include <net/if_var.h>
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#include <net/if_types.h>
This change re-adds L2 caching for TCP and UDP, as originally added in D4306 but removed due to other changes in the system. Restore the llentry pointer to the "struct route", and use it to cache the L2 lookup (ARP or ND6) as appropriate. Submitted by: Mike Karels Differential Revision: https://reviews.freebsd.org/D6262
2016-06-02 17:51:29 +00:00
#include <net/if_llatbl.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <net/route.h>
Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific bits. The motivation here is to eventually teach netisr and potentially other networking subsystems a bit more about how RSS work queues / buckets are configured so things have a hope of auto-configuring in the future. * net/rss_config.[ch] takes care of the generic bits for doing configuration, hash function selection, etc; * topelitz.[ch] is now in net/ rather than netinet/; * (and would be in libkern if it didn't directly include RSS_KEYSIZE; that's a later thing to fix up.) * netinet/in_rss.[ch] now just contains the IPv4 specific methods; * and netinet/in6_rss.[ch] now just contains the IPv6 specific methods. This should have no functional impact on anyone currently using the RSS support. Differential Revision: D1383 Reviewed by: gnn, jfv (intel driver bits)
2015-01-18 18:06:40 +00:00
#include <net/rss_config.h>
Merge the remainder of kern_vimage.c and vimage.h into vnet.c and vnet.h, we now use jails (rather than vimages) as the abstraction for virtualization management, and what remained was specific to virtual network stacks. Minor cleanups are done in the process, and comments updated to reflect these changes. Reviewed by: bz Approved by: re (vimage blanket)
2009-08-01 19:26:27 +00:00
#include <net/vnet.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Make the PCB code compile without INET support by adding #ifdef INETs and correcting few #includes. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-30 11:04:34 +00:00
#if defined(INET) || defined(INET6)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
Add a TCP TIMEWAIT state which uses less space than a fullblown TCP control block. Allow the socket and tcpcb structures to be freed earlier than inpcb. Update code to understand an inp w/o a socket. Reviewed by: hsu, silby, jayanth Sponsored by: DARPA, NAI Labs
2003-02-19 22:32:43 +00:00
#include <netinet/tcp_var.h>
Port randomization leads to extremely fast port reuse at high connection rates, which is causing problems for some users. To retain the security advantage of random ports and ensure correct operation for high connection rate users, disable port randomization during periods of high connection rates. Whenever the connection rate exceeds randomcps (10 by default), randomization will be disabled for randomtime (45 by default) seconds. These thresholds may be tuned via sysctl. Many thanks to Igor Sysoev, who proved the necessity of this change and tested many preliminary versions of the patch. MFC After: 20 seconds
2005-01-02 01:50:57 +00:00
#include <netinet/udp.h>
#include <netinet/udp_var.h>
Make the PCB code compile without INET support by adding #ifdef INETs and correcting few #includes. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-30 11:04:34 +00:00
#endif
#ifdef INET
#include <netinet/in_var.h>
#endif
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#ifdef INET6
#include <netinet/ip6.h>
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
#include <netinet6/in6_pcb.h>
Make the PCB code compile without INET support by adding #ifdef INETs and correcting few #includes. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-30 11:04:34 +00:00
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#endif /* INET6 */
Merge projects/ipsec into head/. Small summary ------------- o Almost all IPsec releated code was moved into sys/netipsec. o New kernel modules added: ipsec.ko and tcpmd5.ko. New kernel option IPSEC_SUPPORT added. It enables support for loading and unloading of ipsec.ko and tcpmd5.ko kernel modules. o IPSEC_NAT_T option was removed. Now NAT-T support is enabled by default. The UDP_ENCAP_ESPINUDP_NON_IKE encapsulation type support was removed. Added TCP/UDP checksum handling for inbound packets that were decapsulated by transport mode SAs. setkey(8) modified to show run-time NAT-T configuration of SA. o New network pseudo interface if_ipsec(4) added. For now it is build as part of ipsec.ko module (or with IPSEC kernel). It implements IPsec virtual tunnels to create route-based VPNs. o The network stack now invokes IPsec functions using special methods. The only one header file <netipsec/ipsec_support.h> should be included to declare all the needed things to work with IPsec. o All IPsec protocols handlers (ESP/AH/IPCOMP protosw) were removed. Now these protocols are handled directly via IPsec methods. o TCP_SIGNATURE support was reworked to be more close to RFC. o PF_KEY SADB was reworked: - now all security associations stored in the single SPI namespace, and all SAs MUST have unique SPI. - several hash tables added to speed up lookups in SADB. - SADB now uses rmlock to protect access, and concurrent threads can do SA lookups in the same time. - many PF_KEY message handlers were reworked to reflect changes in SADB. - SADB_UPDATE message was extended to support new PF_KEY headers: SADB_X_EXT_NEW_ADDRESS_SRC and SADB_X_EXT_NEW_ADDRESS_DST. They can be used by IKE daemon to change SA addresses. o ipsecrequest and secpolicy structures were cardinally changed to avoid locking protection for ipsecrequest. Now we support only limited number (4) of bundled SAs, but they are supported for both INET and INET6. o INPCB security policy cache was introduced. Each PCB now caches used security policies to avoid SP lookup for each packet. o For inbound security policies added the mode, when the kernel does check for full history of applied IPsec transforms. o References counting rules for security policies and security associations were changed. The proper SA locking added into xform code. o xform code was also changed. Now it is possible to unregister xforms. tdb_xxx structures were changed and renamed to reflect changes in SADB/SPDB, and changed rules for locking and refcounting. Reviewed by: gnn, wblock Obtained from: Yandex LLC Relnotes: yes Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D9352
2017-02-06 08:49:57 +00:00
#include <netipsec/ipsec_support.h>
Tie new "Fast IPsec" code into the build. This involves the usual configuration stuff as well as conditional code in the IPv4 and IPv6 areas. Everything is conditional on FAST_IPSEC which is mutually exclusive with IPSEC (KAME IPsec implmentation). As noted previously, don't use FAST_IPSEC with INET6 at the moment. Reviewed by: KAME, rwatson Approved by: silence Supported by: Vernier Networks
2002-10-16 02:25:05 +00:00
Complete break-out of sys/sys/mac.h into sys/security/mac/mac_framework.h begun with a repo-copy of mac.h to mac_framework.h. sys/mac.h now contains the userspace and user<->kernel API and definitions, with all in-kernel interfaces moved to mac_framework.h, which is now included across most of the kernel instead. This change is the first step in a larger cleanup and sweep of MAC Framework interfaces in the kernel, and will not be MFC'd. Obtained from: TrustedBSD Project Sponsored by: SPARTA
2006-10-22 11:52:19 +00:00
#include <security/mac/mac_framework.h>
MFp4 CH=191470: Move the ipport_tick_callout and related functions from ip_input.c to in_pcb.c. The random source port allocation code has been merged and is now local to in_pcb.c only. Use a SYSINIT to get the callout started and no longer depend on initialization from the inet code, which would not work in an IPv6 only setup. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-20 08:00:29 +00:00
static struct callout ipport_tick_callout;
Change the default local address range for IP from 1024 through 5000 to 20000 through 30000. These numbers are used for local IP port numbers when an explicit address is not specified. The values are sysctl modifiable under: net.inet.ip.port_{first|last}_auto These numbers do not overlap with any known server addresses, without going above 32768 which are "negative" on some other implementations. 20000 through 30000 is 2.5 times larger than the old range, but some have suggested even that may not be enough... (gasp!) Setting a low address of 10000 should be plenty.. :-)
1996-01-19 08:00:58 +00:00
/*
* These configure the range of local port addresses assigned to
* "unspecified" outgoing connections/packets/whatever.
*/
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator (DPCPU), as suggested by Peter Wemm, and implement a new per-virtual network stack memory allocator. Modify vnet to use the allocator instead of monolithic global container structures (vinet, ...). This change solves many binary compatibility problems associated with VIMAGE, and restores ELF symbols for virtualized global variables. Each virtualized global variable exists as a "reference copy", and also once per virtual network stack. Virtualized global variables are tagged at compile-time, placing the in a special linker set, which is loaded into a contiguous region of kernel memory. Virtualized global variables in the base kernel are linked as normal, but those in modules are copied and relocated to a reserved portion of the kernel's vnet region with the help of a the kernel linker. Virtualized global variables exist in per-vnet memory set up when the network stack instance is created, and are initialized statically from the reference copy. Run-time access occurs via an accessor macro, which converts from the current vnet and requested symbol to a per-vnet address. When "options VIMAGE" is not compiled into the kernel, normal global ELF symbols will be used instead and indirection is avoided. This change restores static initialization for network stack global variables, restores support for non-global symbols and types, eliminates the need for many subsystem constructors, eliminates large per-subsystem structures that caused many binary compatibility issues both for monitoring applications (netstat) and kernel modules, removes the per-function INIT_VNET_*() macros throughout the stack, eliminates the need for vnet_symmap ksym(2) munging, and eliminates duplicate definitions of virtualized globals under VIMAGE_GLOBALS. Bump __FreeBSD_version and update UPDATING. Portions submitted by: bz Reviewed by: bz, zec Discussed with: gnn, jamie, jeff, jhb, julian, sam Suggested by: peter Approved by: re (kensmith)
2009-07-14 22:48:30 +00:00
VNET_DEFINE(int, ipport_lowfirstauto) = IPPORT_RESERVED - 1; /* 1023 */
VNET_DEFINE(int, ipport_lowlastauto) = IPPORT_RESERVEDSTART; /* 600 */
VNET_DEFINE(int, ipport_firstauto) = IPPORT_EPHEMERALFIRST; /* 10000 */
VNET_DEFINE(int, ipport_lastauto) = IPPORT_EPHEMERALLAST; /* 65535 */
VNET_DEFINE(int, ipport_hifirstauto) = IPPORT_HIFIRSTAUTO; /* 49152 */
VNET_DEFINE(int, ipport_hilastauto) = IPPORT_HILASTAUTO; /* 65535 */
Change the default local address range for IP from 1024 through 5000 to 20000 through 30000. These numbers are used for local IP port numbers when an explicit address is not specified. The values are sysctl modifiable under: net.inet.ip.port_{first|last}_auto These numbers do not overlap with any known server addresses, without going above 32768 which are "negative" on some other implementations. 20000 through 30000 is 2.5 times larger than the old range, but some have suggested even that may not be enough... (gasp!) Setting a low address of 10000 should be plenty.. :-)
1996-01-19 08:00:58 +00:00
The ancient and outdated concept of "privileged ports" in UNIX-type OSes has probably caused more problems than it ever solved. Allow the user to retire the old behavior by specifying their own privileged range with, net.inet.ip.portrange.reservedhigh default = IPPORT_RESERVED - 1 net.inet.ip.portrange.reservedlo default = 0 Now you can run that webserver without ever needing root at all. Or just imagine, an ftpd that can really drop privileges, rather than just set the euid, and still do PORT data transfers from 20/tcp. Two edge cases to note, # sysctl net.inet.ip.portrange.reservedhigh=0 Opens all ports to everyone, and, # sysctl net.inet.ip.portrange.reservedhigh=65535 Locks all network activity to root only (which could actually have been achieved before with ipfw(8), but is somewhat more complicated). For those who stick to the old religion that 0-1023 belong to root and root alone, don't touch the knobs (or even lock them by raising securelevel(8)), and nothing changes.
2003-02-21 05:28:27 +00:00
/*
* Reserved ports accessible only to root. There are significant
* security considerations that must be accounted for when changing these,
* but the security benefits can be great. Please be careful.
*/
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator (DPCPU), as suggested by Peter Wemm, and implement a new per-virtual network stack memory allocator. Modify vnet to use the allocator instead of monolithic global container structures (vinet, ...). This change solves many binary compatibility problems associated with VIMAGE, and restores ELF symbols for virtualized global variables. Each virtualized global variable exists as a "reference copy", and also once per virtual network stack. Virtualized global variables are tagged at compile-time, placing the in a special linker set, which is loaded into a contiguous region of kernel memory. Virtualized global variables in the base kernel are linked as normal, but those in modules are copied and relocated to a reserved portion of the kernel's vnet region with the help of a the kernel linker. Virtualized global variables exist in per-vnet memory set up when the network stack instance is created, and are initialized statically from the reference copy. Run-time access occurs via an accessor macro, which converts from the current vnet and requested symbol to a per-vnet address. When "options VIMAGE" is not compiled into the kernel, normal global ELF symbols will be used instead and indirection is avoided. This change restores static initialization for network stack global variables, restores support for non-global symbols and types, eliminates the need for many subsystem constructors, eliminates large per-subsystem structures that caused many binary compatibility issues both for monitoring applications (netstat) and kernel modules, removes the per-function INIT_VNET_*() macros throughout the stack, eliminates the need for vnet_symmap ksym(2) munging, and eliminates duplicate definitions of virtualized globals under VIMAGE_GLOBALS. Bump __FreeBSD_version and update UPDATING. Portions submitted by: bz Reviewed by: bz, zec Discussed with: gnn, jamie, jeff, jhb, julian, sam Suggested by: peter Approved by: re (kensmith)
2009-07-14 22:48:30 +00:00
VNET_DEFINE(int, ipport_reservedhigh) = IPPORT_RESERVED - 1; /* 1023 */
VNET_DEFINE(int, ipport_reservedlow);
The ancient and outdated concept of "privileged ports" in UNIX-type OSes has probably caused more problems than it ever solved. Allow the user to retire the old behavior by specifying their own privileged range with, net.inet.ip.portrange.reservedhigh default = IPPORT_RESERVED - 1 net.inet.ip.portrange.reservedlo default = 0 Now you can run that webserver without ever needing root at all. Or just imagine, an ftpd that can really drop privileges, rather than just set the euid, and still do PORT data transfers from 20/tcp. Two edge cases to note, # sysctl net.inet.ip.portrange.reservedhigh=0 Opens all ports to everyone, and, # sysctl net.inet.ip.portrange.reservedhigh=65535 Locks all network activity to root only (which could actually have been achieved before with ipfw(8), but is somewhat more complicated). For those who stick to the old religion that 0-1023 belong to root and root alone, don't touch the knobs (or even lock them by raising securelevel(8)), and nothing changes.
2003-02-21 05:28:27 +00:00
Port randomization leads to extremely fast port reuse at high connection rates, which is causing problems for some users. To retain the security advantage of random ports and ensure correct operation for high connection rate users, disable port randomization during periods of high connection rates. Whenever the connection rate exceeds randomcps (10 by default), randomization will be disabled for randomtime (45 by default) seconds. These thresholds may be tuned via sysctl. Many thanks to Igor Sysoev, who proved the necessity of this change and tested many preliminary versions of the patch. MFC After: 20 seconds
2005-01-02 01:50:57 +00:00
/* Variables dealing with random ephemeral port allocation. */
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator (DPCPU), as suggested by Peter Wemm, and implement a new per-virtual network stack memory allocator. Modify vnet to use the allocator instead of monolithic global container structures (vinet, ...). This change solves many binary compatibility problems associated with VIMAGE, and restores ELF symbols for virtualized global variables. Each virtualized global variable exists as a "reference copy", and also once per virtual network stack. Virtualized global variables are tagged at compile-time, placing the in a special linker set, which is loaded into a contiguous region of kernel memory. Virtualized global variables in the base kernel are linked as normal, but those in modules are copied and relocated to a reserved portion of the kernel's vnet region with the help of a the kernel linker. Virtualized global variables exist in per-vnet memory set up when the network stack instance is created, and are initialized statically from the reference copy. Run-time access occurs via an accessor macro, which converts from the current vnet and requested symbol to a per-vnet address. When "options VIMAGE" is not compiled into the kernel, normal global ELF symbols will be used instead and indirection is avoided. This change restores static initialization for network stack global variables, restores support for non-global symbols and types, eliminates the need for many subsystem constructors, eliminates large per-subsystem structures that caused many binary compatibility issues both for monitoring applications (netstat) and kernel modules, removes the per-function INIT_VNET_*() macros throughout the stack, eliminates the need for vnet_symmap ksym(2) munging, and eliminates duplicate definitions of virtualized globals under VIMAGE_GLOBALS. Bump __FreeBSD_version and update UPDATING. Portions submitted by: bz Reviewed by: bz, zec Discussed with: gnn, jamie, jeff, jhb, julian, sam Suggested by: peter Approved by: re (kensmith)
2009-07-14 22:48:30 +00:00
VNET_DEFINE(int, ipport_randomized) = 1; /* user controlled via sysctl */
VNET_DEFINE(int, ipport_randomcps) = 10; /* user controlled via sysctl */
VNET_DEFINE(int, ipport_randomtime) = 45; /* user controlled via sysctl */
VNET_DEFINE(int, ipport_stoprandom); /* toggled by ipport_tick */
VNET_DEFINE(int, ipport_tcpallocs);
After some off-list discussion, revert a number of changes to the DPCPU_DEFINE and VNET_DEFINE macros, as these cause problems for various people working on the affected files. A better long-term solution is still being considered. This reversal may give some modules empty set_pcpu or set_vnet sections, but these are harmless. Changes reverted: ------------------------------------------------------------------------ r215318 | dim | 2010-11-14 21:40:55 +0100 (Sun, 14 Nov 2010) | 4 lines Instead of unconditionally emitting .globl's for the __start_set_xxx and __stop_set_xxx symbols, only emit them when the set_vnet or set_pcpu sections are actually defined. ------------------------------------------------------------------------ r215317 | dim | 2010-11-14 21:38:11 +0100 (Sun, 14 Nov 2010) | 3 lines Apply the STATIC_VNET_DEFINE and STATIC_DPCPU_DEFINE macros throughout the tree. ------------------------------------------------------------------------ r215316 | dim | 2010-11-14 21:23:02 +0100 (Sun, 14 Nov 2010) | 2 lines Add macros to define static instances of VNET_DEFINE and DPCPU_DEFINE.
2010-11-22 19:32:54 +00:00
static VNET_DEFINE(int, ipport_tcplastcount);
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator (DPCPU), as suggested by Peter Wemm, and implement a new per-virtual network stack memory allocator. Modify vnet to use the allocator instead of monolithic global container structures (vinet, ...). This change solves many binary compatibility problems associated with VIMAGE, and restores ELF symbols for virtualized global variables. Each virtualized global variable exists as a "reference copy", and also once per virtual network stack. Virtualized global variables are tagged at compile-time, placing the in a special linker set, which is loaded into a contiguous region of kernel memory. Virtualized global variables in the base kernel are linked as normal, but those in modules are copied and relocated to a reserved portion of the kernel's vnet region with the help of a the kernel linker. Virtualized global variables exist in per-vnet memory set up when the network stack instance is created, and are initialized statically from the reference copy. Run-time access occurs via an accessor macro, which converts from the current vnet and requested symbol to a per-vnet address. When "options VIMAGE" is not compiled into the kernel, normal global ELF symbols will be used instead and indirection is avoided. This change restores static initialization for network stack global variables, restores support for non-global symbols and types, eliminates the need for many subsystem constructors, eliminates large per-subsystem structures that caused many binary compatibility issues both for monitoring applications (netstat) and kernel modules, removes the per-function INIT_VNET_*() macros throughout the stack, eliminates the need for vnet_symmap ksym(2) munging, and eliminates duplicate definitions of virtualized globals under VIMAGE_GLOBALS. Bump __FreeBSD_version and update UPDATING. Portions submitted by: bz Reviewed by: bz, zec Discussed with: gnn, jamie, jeff, jhb, julian, sam Suggested by: peter Approved by: re (kensmith)
2009-07-14 22:48:30 +00:00
Remove unused VNET_SET() and related macros; only VNET_GET() is ever actually used. Rename VNET_GET() to VNET() to shorten variable references. Discussed with: bz, julian Reviewed by: bz Approved by: re (kensmith, kib)
2009-07-16 21:13:04 +00:00
#define V_ipport_tcplastcount VNET(ipport_tcplastcount)
Simplify random port allocation, and add net.inet.ip.portrange.randomized, which can be used to turn off randomized port allocation if so desired. Requested by: alfred
2004-04-22 08:32:14 +00:00
Unbreak NOINET kernels after r222488. Reviewed by: rwatson Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems! Pointy hat: to myself for missing this during review?
2011-05-30 18:07:35 +00:00
static void in_pcbremlists(struct inpcb *inp);
#ifdef INET
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
static struct inpcb *in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo,
struct in_addr faddr, u_int fport_arg,
struct in_addr laddr, u_int lport_arg,
int lookupflags, struct ifnet *ifp);
Make the PCB code compile without INET support by adding #ifdef INETs and correcting few #includes. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-30 11:04:34 +00:00
Add two more portrange sysctls, which control the area of the below IPPORT_RESERVED that is used for selection when bind() is told to allocate a reserved port. Also, implement simple sanity checking for all the addresses set, to make it a little harder for a user/sysadmin to shoot themselves in the feet.
1996-08-12 14:05:54 +00:00
#define RANGECHK(var, min, max) \
if ((var) < (min)) { (var) = (min); } \
else if ((var) > (max)) { (var) = (max); }
static int
Previous commit changing SYSCTL_HANDLER_ARGS violated KNF. Pointed out by: bde
2000-07-04 11:25:35 +00:00
sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
Add two more portrange sysctls, which control the area of the below IPPORT_RESERVED that is used for selection when bind() is told to allocate a reserved port. Also, implement simple sanity checking for all the addresses set, to make it a little harder for a user/sysadmin to shoot themselves in the feet.
1996-08-12 14:05:54 +00:00
{
Fixed misspelling of IPPORT_MAX as USHRT_MAX. Don't include <sys/limits.h> to implement this mistake. Fixed some nearby style bugs (initialization in declaration, misformatting of this initialization, missing blank line after the declaration, and comparision of the non-boolean result of the initialization with 0 using "!". In KNF, "!" is not even used to compare booleans with 0).
2004-04-06 10:59:11 +00:00
int error;
Permit buiding kernels with options VIMAGE, restricted to only a single active network stack instance. Turning on options VIMAGE at compile time yields the following changes relative to default kernel build: 1) V_ accessor macros for virtualized variables resolve to structure fields via base pointers, instead of being resolved as fields in global structs or plain global variables. As an example, V_ifnet becomes: options VIMAGE: ((struct vnet_net *) vnet_net)->_ifnet default build: vnet_net_0._ifnet options VIMAGE_GLOBALS: ifnet 2) INIT_VNET_* macros will declare and set up base pointers to be used by V_ accessor macros, instead of resolving to whitespace: INIT_VNET_NET(ifp->if_vnet); becomes struct vnet_net *vnet_net = (ifp->if_vnet)->mod_data[VNET_MOD_NET]; 3) Memory for vnet modules registered via vnet_mod_register() is now allocated at run time in sys/kern/kern_vimage.c, instead of per vnet module structs being declared as globals. If required, vnet modules can now request the framework to provide them with allocated bzeroed memory by filling in the vmi_size field in their vmi_modinfo structures. 4) structs socket, ifnet, inpcbinfo, tcpcb and syncache_head are extended to hold a pointer to the parent vnet. options VIMAGE builds will fill in those fields as required. 5) curvnet is introduced as a new global variable in options VIMAGE builds, always pointing to the default and only struct vnet. 6) struct sysctl_oid has been extended with additional two fields to store major and minor virtualization module identifiers, oid_v_subs and oid_v_mod. SYSCTL_V_* family of macros will fill in those fields accordingly, and store the offset in the appropriate vnet container struct in oid_arg1. In sysctl handlers dealing with virtualized sysctls, the SYSCTL_RESOLVE_V_ARG1() macro will compute the address of the target variable and make it available in arg1 variable for further processing. Unused fields in structs vnet_inet, vnet_inet6 and vnet_ipfw have been deleted. Reviewed by: bz, rwatson Approved by: julian (mentor)
2009-04-30 13:36:26 +00:00
error = sysctl_handle_int(oidp, arg1, arg2, req);
Fixed misspelling of IPPORT_MAX as USHRT_MAX. Don't include <sys/limits.h> to implement this mistake. Fixed some nearby style bugs (initialization in declaration, misformatting of this initialization, missing blank line after the declaration, and comparision of the non-boolean result of the initialization with 0 using "!". In KNF, "!" is not even used to compare booleans with 0).
2004-04-06 10:59:11 +00:00
if (error == 0) {
Commit step 1 of the vimage project, (network stack) virtualization work done by Marko Zec (zec@). This is the first in a series of commits over the course of the next few weeks. Mark all uses of global variables to be virtualized with a V_ prefix. Use macros to map them back to their global names for now, so this is a NOP change only. We hope to have caught at least 85-90% of what is needed so we do not invalidate a lot of outstanding patches again. Obtained from: //depot/projects/vimage-commit2/... Reviewed by: brooks, des, ed, mav, julian, jamie, kris, rwatson, zec, ... (various people I forgot, different versions) md5 (with a bit of help) Sponsored by: NLnet Foundation, The FreeBSD Foundation X-MFC after: never V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
RANGECHK(V_ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
RANGECHK(V_ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
RANGECHK(V_ipport_firstauto, IPPORT_RESERVED, IPPORT_MAX);
RANGECHK(V_ipport_lastauto, IPPORT_RESERVED, IPPORT_MAX);
RANGECHK(V_ipport_hifirstauto, IPPORT_RESERVED, IPPORT_MAX);
RANGECHK(V_ipport_hilastauto, IPPORT_RESERVED, IPPORT_MAX);
Add two more portrange sysctls, which control the area of the below IPPORT_RESERVED that is used for selection when bind() is told to allocate a reserved port. Also, implement simple sanity checking for all the addresses set, to make it a little harder for a user/sysadmin to shoot themselves in the feet.
1996-08-12 14:05:54 +00:00
}
Fixed misspelling of IPPORT_MAX as USHRT_MAX. Don't include <sys/limits.h> to implement this mistake. Fixed some nearby style bugs (initialization in declaration, misformatting of this initialization, missing blank line after the declaration, and comparision of the non-boolean result of the initialization with 0 using "!". In KNF, "!" is not even used to compare booleans with 0).
2004-04-06 10:59:11 +00:00
return (error);
Add two more portrange sysctls, which control the area of the below IPPORT_RESERVED that is used for selection when bind() is told to allocate a reserved port. Also, implement simple sanity checking for all the addresses set, to make it a little harder for a user/sysadmin to shoot themselves in the feet.
1996-08-12 14:05:54 +00:00
}
Make the default behavior of local port assignment match traditional systems (my last change did not mix well with some firewall configurations). As much as I dislike firewalls, this is one thing I I was not prepared to break by default.. :-) Allow the user to nominate one of three ranges of port numbers as candidates for selecting a local address to replace a zero port number. The ranges are selected via a setsockopt(s, IPPROTO_IP, IP_PORTRANGE, &arg) call. The three ranges are: default, high (to bypass firewalls) and low (to get a port below 1024). The default and high port ranges are sysctl settable under sysctl net.inet.ip.portrange.* This code also fixes a potential deadlock if the system accidently ran out of local port addresses. It'd drop into an infinite while loop. The secure port selection (for root) should reduce overheads and increase reliability of rlogin/rlogind/rsh/rshd if they are modified to take advantage of it. Partly suggested by: pst Reviewed by: wollman
1996-02-22 21:32:23 +00:00
Add two more portrange sysctls, which control the area of the below IPPORT_RESERVED that is used for selection when bind() is told to allocate a reserved port. Also, implement simple sanity checking for all the addresses set, to make it a little harder for a user/sysadmin to shoot themselves in the feet.
1996-08-12 14:05:54 +00:00
#undef RANGECHK
Change the default local address range for IP from 1024 through 5000 to 20000 through 30000. These numbers are used for local IP port numbers when an explicit address is not specified. The values are sysctl modifiable under: net.inet.ip.port_{first|last}_auto These numbers do not overlap with any known server addresses, without going above 32768 which are "negative" on some other implementations. 20000 through 30000 is 2.5 times larger than the old range, but some have suggested even that may not be enough... (gasp!) Setting a low address of 10000 should be plenty.. :-)
1996-01-19 08:00:58 +00:00
Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs. The SYSCTL_NODE macro defines a list that stores all child-elements of that node. If there's no SYSCTL_DECL macro anywhere else, there's no reason why it shouldn't be static.
2011-11-07 15:43:11 +00:00
static SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0,
"IP Ports");
Add two more portrange sysctls, which control the area of the below IPPORT_RESERVED that is used for selection when bind() is told to allocate a reserved port. Also, implement simple sanity checking for all the addresses set, to make it a little harder for a user/sysadmin to shoot themselves in the feet.
1996-08-12 14:05:54 +00:00
Remove SYSCTL_VNET_* macros, and simply put CTLFLAG_VNET where needed. Sponsored by: Nginx, Inc.
2014-11-07 09:39:05 +00:00
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
&VNET_NAME(ipport_lowfirstauto), 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
&VNET_NAME(ipport_lowlastauto), 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
&VNET_NAME(ipport_firstauto), 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
&VNET_NAME(ipport_lastauto), 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
&VNET_NAME(ipport_hifirstauto), 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
&VNET_NAME(ipport_hilastauto), 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
CTLFLAG_VNET | CTLFLAG_RW | CTLFLAG_SECURE,
&VNET_NAME(ipport_reservedhigh), 0, "");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator (DPCPU), as suggested by Peter Wemm, and implement a new per-virtual network stack memory allocator. Modify vnet to use the allocator instead of monolithic global container structures (vinet, ...). This change solves many binary compatibility problems associated with VIMAGE, and restores ELF symbols for virtualized global variables. Each virtualized global variable exists as a "reference copy", and also once per virtual network stack. Virtualized global variables are tagged at compile-time, placing the in a special linker set, which is loaded into a contiguous region of kernel memory. Virtualized global variables in the base kernel are linked as normal, but those in modules are copied and relocated to a reserved portion of the kernel's vnet region with the help of a the kernel linker. Virtualized global variables exist in per-vnet memory set up when the network stack instance is created, and are initialized statically from the reference copy. Run-time access occurs via an accessor macro, which converts from the current vnet and requested symbol to a per-vnet address. When "options VIMAGE" is not compiled into the kernel, normal global ELF symbols will be used instead and indirection is avoided. This change restores static initialization for network stack global variables, restores support for non-global symbols and types, eliminates the need for many subsystem constructors, eliminates large per-subsystem structures that caused many binary compatibility issues both for monitoring applications (netstat) and kernel modules, removes the per-function INIT_VNET_*() macros throughout the stack, eliminates the need for vnet_symmap ksym(2) munging, and eliminates duplicate definitions of virtualized globals under VIMAGE_GLOBALS. Bump __FreeBSD_version and update UPDATING. Portions submitted by: bz Reviewed by: bz, zec Discussed with: gnn, jamie, jeff, jhb, julian, sam Suggested by: peter Approved by: re (kensmith)
2009-07-14 22:48:30 +00:00
CTLFLAG_RW|CTLFLAG_SECURE, &VNET_NAME(ipport_reservedlow), 0, "");
Remove SYSCTL_VNET_* macros, and simply put CTLFLAG_VNET where needed. Sponsored by: Nginx, Inc.
2014-11-07 09:39:05 +00:00
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized,
CTLFLAG_VNET | CTLFLAG_RW,
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator (DPCPU), as suggested by Peter Wemm, and implement a new per-virtual network stack memory allocator. Modify vnet to use the allocator instead of monolithic global container structures (vinet, ...). This change solves many binary compatibility problems associated with VIMAGE, and restores ELF symbols for virtualized global variables. Each virtualized global variable exists as a "reference copy", and also once per virtual network stack. Virtualized global variables are tagged at compile-time, placing the in a special linker set, which is loaded into a contiguous region of kernel memory. Virtualized global variables in the base kernel are linked as normal, but those in modules are copied and relocated to a reserved portion of the kernel's vnet region with the help of a the kernel linker. Virtualized global variables exist in per-vnet memory set up when the network stack instance is created, and are initialized statically from the reference copy. Run-time access occurs via an accessor macro, which converts from the current vnet and requested symbol to a per-vnet address. When "options VIMAGE" is not compiled into the kernel, normal global ELF symbols will be used instead and indirection is avoided. This change restores static initialization for network stack global variables, restores support for non-global symbols and types, eliminates the need for many subsystem constructors, eliminates large per-subsystem structures that caused many binary compatibility issues both for monitoring applications (netstat) and kernel modules, removes the per-function INIT_VNET_*() macros throughout the stack, eliminates the need for vnet_symmap ksym(2) munging, and eliminates duplicate definitions of virtualized globals under VIMAGE_GLOBALS. Bump __FreeBSD_version and update UPDATING. Portions submitted by: bz Reviewed by: bz, zec Discussed with: gnn, jamie, jeff, jhb, julian, sam Suggested by: peter Approved by: re (kensmith)
2009-07-14 22:48:30 +00:00
&VNET_NAME(ipport_randomized), 0, "Enable random port allocation");
Remove SYSCTL_VNET_* macros, and simply put CTLFLAG_VNET where needed. Sponsored by: Nginx, Inc.
2014-11-07 09:39:05 +00:00
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomcps,
CTLFLAG_VNET | CTLFLAG_RW,
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator (DPCPU), as suggested by Peter Wemm, and implement a new per-virtual network stack memory allocator. Modify vnet to use the allocator instead of monolithic global container structures (vinet, ...). This change solves many binary compatibility problems associated with VIMAGE, and restores ELF symbols for virtualized global variables. Each virtualized global variable exists as a "reference copy", and also once per virtual network stack. Virtualized global variables are tagged at compile-time, placing the in a special linker set, which is loaded into a contiguous region of kernel memory. Virtualized global variables in the base kernel are linked as normal, but those in modules are copied and relocated to a reserved portion of the kernel's vnet region with the help of a the kernel linker. Virtualized global variables exist in per-vnet memory set up when the network stack instance is created, and are initialized statically from the reference copy. Run-time access occurs via an accessor macro, which converts from the current vnet and requested symbol to a per-vnet address. When "options VIMAGE" is not compiled into the kernel, normal global ELF symbols will be used instead and indirection is avoided. This change restores static initialization for network stack global variables, restores support for non-global symbols and types, eliminates the need for many subsystem constructors, eliminates large per-subsystem structures that caused many binary compatibility issues both for monitoring applications (netstat) and kernel modules, removes the per-function INIT_VNET_*() macros throughout the stack, eliminates the need for vnet_symmap ksym(2) munging, and eliminates duplicate definitions of virtualized globals under VIMAGE_GLOBALS. Bump __FreeBSD_version and update UPDATING. Portions submitted by: bz Reviewed by: bz, zec Discussed with: gnn, jamie, jeff, jhb, julian, sam Suggested by: peter Approved by: re (kensmith)
2009-07-14 22:48:30 +00:00
&VNET_NAME(ipport_randomcps), 0, "Maximum number of random port "
Step 1.5 of importing the network stack virtualization infrastructure from the vimage project, as per plan established at devsummit 08/08: http://wiki.freebsd.org/Image/Notes200808DevSummit Introduce INIT_VNET_*() initializer macros, VNET_FOREACH() iterator macros, and CURVNET_SET() context setting macros, all currently resolving to NOPs. Prepare for virtualization of selected SYSCTL objects by introducing a family of SYSCTL_V_*() macros, currently resolving to their global counterparts, i.e. SYSCTL_V_INT() == SYSCTL_INT(). Move selected #defines from sys/sys/vimage.h to newly introduced header files specific to virtualized subsystems (sys/net/vnet.h, sys/netinet/vinet.h etc.). All the changes are verified to have zero functional impact at this point in time by doing MD5 comparision between pre- and post-change object files(*). (*) netipsec/keysock.c did not validate depending on compile time options. Implemented by: julian, bz, brooks, zec Reviewed by: julian, bz, brooks, kris, rwatson, ... Approved by: julian (mentor) Obtained from: //depot/projects/vimage-commit2/... X-MFC after: never Sponsored by: NLnet Foundation, The FreeBSD Foundation
2008-10-02 15:37:58 +00:00
"allocations before switching to a sequental one");
Remove SYSCTL_VNET_* macros, and simply put CTLFLAG_VNET where needed. Sponsored by: Nginx, Inc.
2014-11-07 09:39:05 +00:00
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomtime,
CTLFLAG_VNET | CTLFLAG_RW,
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator (DPCPU), as suggested by Peter Wemm, and implement a new per-virtual network stack memory allocator. Modify vnet to use the allocator instead of monolithic global container structures (vinet, ...). This change solves many binary compatibility problems associated with VIMAGE, and restores ELF symbols for virtualized global variables. Each virtualized global variable exists as a "reference copy", and also once per virtual network stack. Virtualized global variables are tagged at compile-time, placing the in a special linker set, which is loaded into a contiguous region of kernel memory. Virtualized global variables in the base kernel are linked as normal, but those in modules are copied and relocated to a reserved portion of the kernel's vnet region with the help of a the kernel linker. Virtualized global variables exist in per-vnet memory set up when the network stack instance is created, and are initialized statically from the reference copy. Run-time access occurs via an accessor macro, which converts from the current vnet and requested symbol to a per-vnet address. When "options VIMAGE" is not compiled into the kernel, normal global ELF symbols will be used instead and indirection is avoided. This change restores static initialization for network stack global variables, restores support for non-global symbols and types, eliminates the need for many subsystem constructors, eliminates large per-subsystem structures that caused many binary compatibility issues both for monitoring applications (netstat) and kernel modules, removes the per-function INIT_VNET_*() macros throughout the stack, eliminates the need for vnet_symmap ksym(2) munging, and eliminates duplicate definitions of virtualized globals under VIMAGE_GLOBALS. Bump __FreeBSD_version and update UPDATING. Portions submitted by: bz Reviewed by: bz, zec Discussed with: gnn, jamie, jeff, jhb, julian, sam Suggested by: peter Approved by: re (kensmith)
2009-07-14 22:48:30 +00:00
&VNET_NAME(ipport_randomtime), 0,
Step 1.5 of importing the network stack virtualization infrastructure from the vimage project, as per plan established at devsummit 08/08: http://wiki.freebsd.org/Image/Notes200808DevSummit Introduce INIT_VNET_*() initializer macros, VNET_FOREACH() iterator macros, and CURVNET_SET() context setting macros, all currently resolving to NOPs. Prepare for virtualization of selected SYSCTL objects by introducing a family of SYSCTL_V_*() macros, currently resolving to their global counterparts, i.e. SYSCTL_V_INT() == SYSCTL_INT(). Move selected #defines from sys/sys/vimage.h to newly introduced header files specific to virtualized subsystems (sys/net/vnet.h, sys/netinet/vinet.h etc.). All the changes are verified to have zero functional impact at this point in time by doing MD5 comparision between pre- and post-change object files(*). (*) netipsec/keysock.c did not validate depending on compile time options. Implemented by: julian, bz, brooks, zec Reviewed by: julian, bz, brooks, kris, rwatson, ... Approved by: julian (mentor) Obtained from: //depot/projects/vimage-commit2/... X-MFC after: never Sponsored by: NLnet Foundation, The FreeBSD Foundation
2008-10-02 15:37:58 +00:00
"Minimum time to keep sequental port "
"allocation before switching to a random one");
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif /* INET */
New style sysctl & staticize alot of stuff.
1995-11-14 20:34:56 +00:00
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
/*
* in_pcb.c: manage the Protocol Control Blocks.
*
Remove no-op spl references in in_pcb.c, since in_pcb locking has been basically complete for several years now. Update one spl comment to reference the locking strategy. MFC after: 3 days
2005-07-19 12:24:27 +00:00
* NOTE: It is assumed that most of these functions will be called with
* the pcbinfo lock held, and often, the inpcb lock held, as these utility
* functions often modify hash chains or addresses in pcbs.
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
*/
Reduce in_pcbinfo_init() by two params. No users supply any flags to this function (they used to say UMA_ZONE_NOFREE), so flag parameter goes away. The zone_fini parameter also goes away. Previously no protocols (except divert) supplied zone_fini function, so inpcb locks were leaked with slabs. This was okay while zones were allocated with UMA_ZONE_NOFREE flag, but now this is a leak. Fix that by suppling inpcb_fini() function as fini method for all inpcb zones.
2017-05-15 21:58:36 +00:00
/*
* Different protocols initialize their inpcbs differently - giving
* different name to the lock. But they all are disposed the same.
*/
static void
inpcb_fini(void *mem, int size)
{
struct inpcb *inp = mem;
INP_LOCK_DESTROY(inp);
}
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
/*
* Initialize an inpcbinfo -- we should be able to reduce the number of
* arguments in time.
*/
void
in_pcbinfo_init(struct inpcbinfo *pcbinfo, const char *name,
struct inpcbhead *listhead, int hash_nelements, int porthash_nelements,
Reduce in_pcbinfo_init() by two params. No users supply any flags to this function (they used to say UMA_ZONE_NOFREE), so flag parameter goes away. The zone_fini parameter also goes away. Previously no protocols (except divert) supplied zone_fini function, so inpcb locks were leaked with slabs. This was okay while zones were allocated with UMA_ZONE_NOFREE flag, but now this is a leak. Fix that by suppling inpcb_fini() function as fini method for all inpcb zones.
2017-05-15 21:58:36 +00:00
char *inpcbzone_name, uma_init inpcbzone_init, u_int hashfields)
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
{
INP_INFO_LOCK_INIT(pcbinfo, name);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_LOCK_INIT(pcbinfo, "pcbinfohash"); /* XXXRW: argument? */
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_LIST_LOCK_INIT(pcbinfo, "pcbinfolist");
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
#ifdef VIMAGE
pcbinfo->ipi_vnet = curvnet;
#endif
pcbinfo->ipi_listhead = listhead;
LIST_INIT(pcbinfo->ipi_listhead);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
pcbinfo->ipi_count = 0;
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
pcbinfo->ipi_hashbase = hashinit(hash_nelements, M_PCB,
&pcbinfo->ipi_hashmask);
pcbinfo->ipi_porthashbase = hashinit(porthash_nelements, M_PCB,
&pcbinfo->ipi_porthashmask);
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#ifdef PCBGROUP
in_pcbgroup_init(pcbinfo, hashfields, hash_nelements);
#endif
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
pcbinfo->ipi_zone = uma_zcreate(inpcbzone_name, sizeof(struct inpcb),
Reduce in_pcbinfo_init() by two params. No users supply any flags to this function (they used to say UMA_ZONE_NOFREE), so flag parameter goes away. The zone_fini parameter also goes away. Previously no protocols (except divert) supplied zone_fini function, so inpcb locks were leaked with slabs. This was okay while zones were allocated with UMA_ZONE_NOFREE flag, but now this is a leak. Fix that by suppling inpcb_fini() function as fini method for all inpcb zones.
2017-05-15 21:58:36 +00:00
NULL, NULL, inpcbzone_init, inpcb_fini, UMA_ALIGN_PTR, 0);
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
uma_zone_set_max(pcbinfo->ipi_zone, maxsockets);
More warnings for zones that depend on the kern.ipc.maxsockets limit. Obtained from: WHEEL Systems
2012-12-08 12:51:06 +00:00
uma_zone_set_warning(pcbinfo->ipi_zone,
"kern.ipc.maxsockets limit reached");
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
}
/*
* Destroy an inpcbinfo.
*/
void
in_pcbinfo_destroy(struct inpcbinfo *pcbinfo)
{
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
KASSERT(pcbinfo->ipi_count == 0,
("%s: ipi_count = %u", __func__, pcbinfo->ipi_count));
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
hashdestroy(pcbinfo->ipi_hashbase, M_PCB, pcbinfo->ipi_hashmask);
hashdestroy(pcbinfo->ipi_porthashbase, M_PCB,
pcbinfo->ipi_porthashmask);
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#ifdef PCBGROUP
in_pcbgroup_destroy(pcbinfo);
#endif
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
uma_zdestroy(pcbinfo->ipi_zone);
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_LIST_LOCK_DESTROY(pcbinfo);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_LOCK_DESTROY(pcbinfo);
Abstract out initialization of most aspects of struct inpcbinfo from their calling contexts in {IP divert, raw IP sockets, TCP, UDP} and create new helper functions: in_pcbinfo_init() and in_pcbinfo_destroy() to do this work in a central spot. As inpcbinfo becomes more complex due to ongoing work to add connection groups, this will reduce code duplication. MFC after: 1 month Reviewed by: bz Sponsored by: Juniper Networks
2010-03-14 18:59:11 +00:00
INP_INFO_LOCK_DESTROY(pcbinfo);
}
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
/*
* Allocate a PCB and associate it with the socket.
Fix race conditions on enumerating pcb lists by moving the initialization ( and where appropriate the destruction) of the pcb mutex to the init/finit functions of the pcb zones. This allows locking of the pcb entries and race condition free comparison of the generation count. Rearrange locking a bit to avoid extra locking operation to update the generation count in in_pcballoc(). (in_pcballoc now returns the pcb locked) I am planning to convert pcb list handling from a type safe to a reference count model soon. ( As this allows really freeing the PCBs) Reviewed by: rwatson@, mohans@ MFC after: 1 week
2006-07-18 22:34:27 +00:00
* On success return with the PCB locked.
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
*/
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
int
Fix race conditions on enumerating pcb lists by moving the initialization ( and where appropriate the destruction) of the pcb mutex to the init/finit functions of the pcb zones. This allows locking of the pcb entries and race condition free comparison of the generation count. Rearrange locking a bit to avoid extra locking operation to update the generation count in in_pcballoc(). (in_pcballoc now returns the pcb locked) I am planning to convert pcb list handling from a type safe to a reference count model soon. ( As this allows really freeing the PCBs) Reviewed by: rwatson@, mohans@ MFC after: 1 week
2006-07-18 22:34:27 +00:00
in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
struct inpcb *inp;
move ipsec security policy allocation into in_pcballoc, before making pcbs available to the outside world. otherwise, we will see inpcb without ipsec security policy attached (-> panic() in ipsec.c). Obtained from: KAME MFC after: 3 days
2001-07-26 19:19:49 +00:00
int error;
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
#ifdef INVARIANTS
if (pcbinfo == &V_tcbinfo) {
INP_INFO_RLOCK_ASSERT(pcbinfo);
} else {
INP_INFO_WLOCK_ASSERT(pcbinfo);
}
#endif
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
error = 0;
Fix race conditions on enumerating pcb lists by moving the initialization ( and where appropriate the destruction) of the pcb mutex to the init/finit functions of the pcb zones. This allows locking of the pcb entries and race condition free comparison of the generation count. Rearrange locking a bit to avoid extra locking operation to update the generation count in in_pcballoc(). (in_pcballoc now returns the pcb locked) I am planning to convert pcb list handling from a type safe to a reference count model soon. ( As this allows really freeing the PCBs) Reviewed by: rwatson@, mohans@ MFC after: 1 week
2006-07-18 22:34:27 +00:00
inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (inp == NULL)
return (ENOBUFS);
o Rearrange struct inpcb fields to optimize the TCP output code path considering cache line hits and misses. Put the lock and hash list glue into the first cache line, put inp_refcount inp_flags inp_socket into the second cache line. o On allocation zero out entire structure except the lock and list entries, including inp_route inp_lle inp_gencnt. When inp_route and inp_lle were introduced, they were added below inp_zero_size, resulting on not being cleared after free/alloc. This definitely was a source of bugs with route caching. Could be that r315956 has just fixed one of them. The inp_gencnt is reinitialized on every alloc, so it is safe to clear it. This has been proved to improve TCP performance at Netflix. Obtained from: rrs Differential Revision: D10686
2017-05-24 17:47:16 +00:00
bzero(&inp->inp_start_zero, inp_zero_size);
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
inp->inp_pcbinfo = pcbinfo;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
inp->inp_socket = so;
Cache so_cred as inp_cred in the inpcb. This means that inp_cred is always there, even after the socket has gone away. It also means that it is constant for the lifetime of the inp. Both facts lead to simpler code and possibly less locking. Suggested by: rwatson Reviewed by: rwatson MFC after: 6 weeks X-MFC Note: use a inp_pspare for inp_cred
2008-10-04 15:06:34 +00:00
inp->inp_cred = crhold(so->so_cred);
Add code to allow the system to handle multiple routing tables. This particular implementation is designed to be fully backwards compatible and to be MFC-able to 7.x (and 6.x) Currently the only protocol that can make use of the multiple tables is IPv4 Similar functionality exists in OpenBSD and Linux. From my notes: ----- One thing where FreeBSD has been falling behind, and which by chance I have some time to work on is "policy based routing", which allows different packet streams to be routed by more than just the destination address. Constraints: ------------ I want to make some form of this available in the 6.x tree (and by extension 7.x) , but FreeBSD in general needs it so I might as well do it in -current and back port the portions I need. One of the ways that this can be done is to have the ability to instantiate multiple kernel routing tables (which I will now refer to as "Forwarding Information Bases" or "FIBs" for political correctness reasons). Which FIB a particular packet uses to make the next hop decision can be decided by a number of mechanisms. The policies these mechanisms implement are the "Policies" referred to in "Policy based routing". One of the constraints I have if I try to back port this work to 6.x is that it must be implemented as a EXTENSION to the existing ABIs in 6.x so that third party applications do not need to be recompiled in timespan of the branch. This first version will not have some of the bells and whistles that will come with later versions. It will, for example, be limited to 16 tables in the first commit. Implementation method, Compatible version. (part 1) ------------------------------- For this reason I have implemented a "sufficient subset" of a multiple routing table solution in Perforce, and back-ported it to 6.x. (also in Perforce though not always caught up with what I have done in -current/P4). The subset allows a number of FIBs to be defined at compile time (8 is sufficient for my purposes in 6.x) and implements the changes needed to allow IPV4 to use them. I have not done the changes for ipv6 simply because I do not need it, and I do not have enough knowledge of ipv6 (e.g. neighbor discovery) needed to do it. Other protocol families are left untouched and should there be users with proprietary protocol families, they should continue to work and be oblivious to the existence of the extra FIBs. To understand how this is done, one must know that the current FIB code starts everything off with a single dimensional array of pointers to FIB head structures (One per protocol family), each of which in turn points to the trie of routes available to that family. The basic change in the ABI compatible version of the change is to extent that array to be a 2 dimensional array, so that instead of protocol family X looking at rt_tables[X] for the table it needs, it looks at rt_tables[Y][X] when for all protocol families except ipv4 Y is always 0. Code that is unaware of the change always just sees the first row of the table, which of course looks just like the one dimensional array that existed before. The entry points rtrequest(), rtalloc(), rtalloc1(), rtalloc_ign() are all maintained, but refer only to the first row of the array, so that existing callers in proprietary protocols can continue to do the "right thing". Some new entry points are added, for the exclusive use of ipv4 code called in_rtrequest(), in_rtalloc(), in_rtalloc1() and in_rtalloc_ign(), which have an extra argument which refers the code to the correct row. In addition, there are some new entry points (currently called rtalloc_fib() and friends) that check the Address family being looked up and call either rtalloc() (and friends) if the protocol is not IPv4 forcing the action to row 0 or to the appropriate row if it IS IPv4 (and that info is available). These are for calling from code that is not specific to any particular protocol. The way these are implemented would change in the non ABI preserving code to be added later. One feature of the first version of the code is that for ipv4, the interface routes show up automatically on all the FIBs, so that no matter what FIB you select you always have the basic direct attached hosts available to you. (rtinit() does this automatically). You CAN delete an interface route from one FIB should you want to but by default it's there. ARP information is also available in each FIB. It's assumed that the same machine would have the same MAC address, regardless of which FIB you are using to get to it. This brings us as to how the correct FIB is selected for an outgoing IPV4 packet. Firstly, all packets have a FIB associated with them. if nothing has been done to change it, it will be FIB 0. The FIB is changed in the following ways. Packets fall into one of a number of classes. 1/ locally generated packets, coming from a socket/PCB. Such packets select a FIB from a number associated with the socket/PCB. This in turn is inherited from the process, but can be changed by a socket option. The process in turn inherits it on fork. I have written a utility call setfib that acts a bit like nice.. setfib -3 ping target.example.com # will use fib 3 for ping. It is an obvious extension to make it a property of a jail but I have not done so. It can be achieved by combining the setfib and jail commands. 2/ packets received on an interface for forwarding. By default these packets would use table 0, (or possibly a number settable in a sysctl(not yet)). but prior to routing the firewall can inspect them (see below). (possibly in the future you may be able to associate a FIB with packets received on an interface.. An ifconfig arg, but not yet.) 3/ packets inspected by a packet classifier, which can arbitrarily associate a fib with it on a packet by packet basis. A fib assigned to a packet by a packet classifier (such as ipfw) would over-ride a fib associated by a more default source. (such as cases 1 or 2). 4/ a tcp listen socket associated with a fib will generate accept sockets that are associated with that same fib. 5/ Packets generated in response to some other packet (e.g. reset or icmp packets). These should use the FIB associated with the packet being reponded to. 6/ Packets generated during encapsulation. gif, tun and other tunnel interfaces will encapsulate using the FIB that was in effect withthe proces that set up the tunnel. thus setfib 1 ifconfig gif0 [tunnel instructions] will set the fib for the tunnel to use to be fib 1. Routing messages would be associated with their process, and thus select one FIB or another. messages from the kernel would be associated with the fib they refer to and would only be received by a routing socket associated with that fib. (not yet implemented) In addition Netstat has been edited to be able to cope with the fact that the array is now 2 dimensional. (It looks in system memory using libkvm (!)). Old versions of netstat see only the first FIB. In addition two sysctls are added to give: a) the number of FIBs compiled in (active) b) the default FIB of the calling process. Early testing experience: ------------------------- Basically our (IronPort's) appliance does this functionality already using ipfw fwd but that method has some drawbacks. For example, It can't fully simulate a routing table because it can't influence the socket's choice of local address when a connect() is done. Testing during the generating of these changes has been remarkably smooth so far. Multiple tables have co-existed with no notable side effects, and packets have been routes accordingly. ipfw has grown 2 new keywords: setfib N ip from anay to any count ip from any to any fib N In pf there seems to be a requirement to be able to give symbolic names to the fibs but I do not have that capacity. I am not sure if it is required. SCTP has interestingly enough built in support for this, called VRFs in Cisco parlance. it will be interesting to see how that handles it when it suddenly actually does something. Where to next: -------------------- After committing the ABI compatible version and MFCing it, I'd like to proceed in a forward direction in -current. this will result in some roto-tilling in the routing code. Firstly: the current code's idea of having a separate tree per protocol family, all of the same format, and pointed to by the 1 dimensional array is a bit silly. Especially when one considers that there is code that makes assumptions about every protocol having the same internal structures there. Some protocols don't WANT that sort of structure. (for example the whole idea of a netmask is foreign to appletalk). This needs to be made opaque to the external code. My suggested first change is to add routing method pointers to the 'domain' structure, along with information pointing the data. instead of having an array of pointers to uniform structures, there would be an array pointing to the 'domain' structures for each protocol address domain (protocol family), and the methods this reached would be called. The methods would have an argument that gives FIB number, but the protocol would be free to ignore it. When the ABI can be changed it raises the possibilty of the addition of a fib entry into the "struct route". Currently, the structure contains the sockaddr of the desination, and the resulting fib entry. To make this work fully, one could add a fib number so that given an address and a fib, one can find the third element, the fib entry. Interaction with the ARP layer/ LL layer would need to be revisited as well. Qing Li has been working on this already. This work was sponsored by Ironport Systems/Cisco Reviewed by: several including rwatson, bz and mlair (parts each) Obtained from: Ironport systems/Cisco
2008-05-09 23:03:00 +00:00
inp->inp_inc.inc_fibnum = so->so_fibnum;
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
#ifdef MAC
Merge first in a series of TrustedBSD MAC Framework KPI changes from Mac OS X Leopard--rationalize naming for entry points to the following general forms: mac_<object>_<method/action> mac_<object>_check_<method/action> The previous naming scheme was inconsistent and mostly reversed from the new scheme. Also, make object types more consistent and remove spaces from object types that contain multiple parts ("posix_sem" -> "posixsem") to make mechanical parsing easier. Introduce a new "netinet" object type for certain IPv4/IPv6-related methods. Also simplify, slightly, some entry point names. All MAC policy modules will need to be recompiled, and modules not updates as part of this commit will need to be modified to conform to the new KPI. Sponsored by: SPARTA (original patches against Mac OS X) Obtained from: TrustedBSD Project, Apple Computer
2007-10-24 19:04:04 +00:00
error = mac_inpcb_init(inp, M_NOWAIT);
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
if (error != 0)
goto out;
Merge first in a series of TrustedBSD MAC Framework KPI changes from Mac OS X Leopard--rationalize naming for entry points to the following general forms: mac_<object>_<method/action> mac_<object>_check_<method/action> The previous naming scheme was inconsistent and mostly reversed from the new scheme. Also, make object types more consistent and remove spaces from object types that contain multiple parts ("posix_sem" -> "posixsem") to make mechanical parsing easier. Introduce a new "netinet" object type for certain IPv4/IPv6-related methods. Also simplify, slightly, some entry point names. All MAC policy modules will need to be recompiled, and modules not updates as part of this commit will need to be modified to conform to the new KPI. Sponsored by: SPARTA (original patches against Mac OS X) Obtained from: TrustedBSD Project, Apple Computer
2007-10-24 19:04:04 +00:00
mac_inpcb_create(so, inp);
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
#endif
Merge projects/ipsec into head/. Small summary ------------- o Almost all IPsec releated code was moved into sys/netipsec. o New kernel modules added: ipsec.ko and tcpmd5.ko. New kernel option IPSEC_SUPPORT added. It enables support for loading and unloading of ipsec.ko and tcpmd5.ko kernel modules. o IPSEC_NAT_T option was removed. Now NAT-T support is enabled by default. The UDP_ENCAP_ESPINUDP_NON_IKE encapsulation type support was removed. Added TCP/UDP checksum handling for inbound packets that were decapsulated by transport mode SAs. setkey(8) modified to show run-time NAT-T configuration of SA. o New network pseudo interface if_ipsec(4) added. For now it is build as part of ipsec.ko module (or with IPSEC kernel). It implements IPsec virtual tunnels to create route-based VPNs. o The network stack now invokes IPsec functions using special methods. The only one header file <netipsec/ipsec_support.h> should be included to declare all the needed things to work with IPsec. o All IPsec protocols handlers (ESP/AH/IPCOMP protosw) were removed. Now these protocols are handled directly via IPsec methods. o TCP_SIGNATURE support was reworked to be more close to RFC. o PF_KEY SADB was reworked: - now all security associations stored in the single SPI namespace, and all SAs MUST have unique SPI. - several hash tables added to speed up lookups in SADB. - SADB now uses rmlock to protect access, and concurrent threads can do SA lookups in the same time. - many PF_KEY message handlers were reworked to reflect changes in SADB. - SADB_UPDATE message was extended to support new PF_KEY headers: SADB_X_EXT_NEW_ADDRESS_SRC and SADB_X_EXT_NEW_ADDRESS_DST. They can be used by IKE daemon to change SA addresses. o ipsecrequest and secpolicy structures were cardinally changed to avoid locking protection for ipsecrequest. Now we support only limited number (4) of bundled SAs, but they are supported for both INET and INET6. o INPCB security policy cache was introduced. Each PCB now caches used security policies to avoid SP lookup for each packet. o For inbound security policies added the mode, when the kernel does check for full history of applied IPsec transforms. o References counting rules for security policies and security associations were changed. The proper SA locking added into xform code. o xform code was also changed. Now it is possible to unregister xforms. tdb_xxx structures were changed and renamed to reflect changes in SADB/SPDB, and changed rules for locking and refcounting. Reviewed by: gnn, wblock Obtained from: Yandex LLC Relnotes: yes Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D9352
2017-02-06 08:49:57 +00:00
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
error = ipsec_init_pcbpolicy(inp);
When IPSEC fails to allocate policy state for an inpcb, and MAC is in use, free the MAC label on the inpcb before freeing the inpcb. MFC after: 3 days Submitted by: tanyong <tanyong at ercist dot iscas dot ac dot cn>, zhouzhouyi
2007-12-22 10:06:11 +00:00
if (error != 0) {
#ifdef MAC
mac_inpcb_destroy(inp);
#endif
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
goto out;
Fix indentation for a closing brace in in_pcballoc(). MFC after: 3 days
2008-03-17 13:04:56 +00:00
}
Commit the change from FAST_IPSEC to IPSEC. The FAST_IPSEC option is now deprecated, as well as the KAME IPsec code. What was FAST_IPSEC is now IPSEC. Approved by: re Sponsored by: Secure Computing
2007-07-03 12:13:45 +00:00
#endif /*IPSEC*/
Consistently use #ifdef INET6 rather than mixing and matching with #if defined(INET6). Don't comment the end of short #ifdef blocks. Comment cleanup. Line wrap.
2006-11-30 10:54:54 +00:00
#ifdef INET6
Add a TCP TIMEWAIT state which uses less space than a fullblown TCP control block. Allow the socket and tcpcb structures to be freed earlier than inpcb. Update code to understand an inp w/o a socket. Reviewed by: hsu, silby, jayanth Sponsored by: DARPA, NAI Labs
2003-02-19 22:32:43 +00:00
if (INP_SOCKAF(so) == AF_INET6) {
inp->inp_vflag |= INP_IPV6PROTO;
Commit step 1 of the vimage project, (network stack) virtualization work done by Marko Zec (zec@). This is the first in a series of commits over the course of the next few weeks. Mark all uses of global variables to be virtualized with a V_ prefix. Use macros to map them back to their global names for now, so this is a NOP change only. We hope to have caught at least 85-90% of what is needed so we do not invalidate a lot of outstanding patches again. Obtained from: //depot/projects/vimage-commit2/... Reviewed by: brooks, des, ed, mav, julian, jamie, kris, rwatson, zec, ... (various people I forgot, different versions) md5 (with a bit of help) Sponsored by: NLnet Foundation, The FreeBSD Foundation X-MFC after: never V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
if (V_ip6_v6only)
Add a TCP TIMEWAIT state which uses less space than a fullblown TCP control block. Allow the socket and tcpcb structures to be freed earlier than inpcb. Update code to understand an inp w/o a socket. Reviewed by: hsu, silby, jayanth Sponsored by: DARPA, NAI Labs
2003-02-19 22:32:43 +00:00
inp->inp_flags |= IN6P_IPV6_V6ONLY;
}
Try and make the kernel build again without INET6.
2000-04-02 03:49:25 +00:00
#endif
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_WLOCK(inp);
INP_LIST_WLOCK(pcbinfo);
Rename some fields of struct inpcbinfo to have the ipi_ prefix, consistent with the naming of other structure field members, and reducing improper grep matches. Clean up and comment structure fields in structure definition.
2007-04-30 23:12:05 +00:00
LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
Use the zone allocator to allocate inpcbs and tcpcbs. Each protocol creates its own zone; this is used particularly by TCP which allocates both inpcb and tcpcb in a single allocation. (Some hackery ensures that the tcpcb is reasonably aligned.) Also keep track of the number of pcbs of each type allocated, and keep a generation count (instance version number) for future use.
1998-03-24 18:06:34 +00:00
pcbinfo->ipi_count++;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
so->so_pcb = (caddr_t)inp;
Sync with recent KAME. This work was based on kame-20010528-freebsd43-snap.tgz and some critical problem after the snap was out were fixed. There are many many changes since last KAME merge. TODO: - The definitions of SADB_* in sys/net/pfkeyv2.h are still different from RFC2407/IANA assignment because of binary compatibility issue. It should be fixed under 5-CURRENT. - ip6po_m member of struct ip6_pktopts is no longer used. But, it is still there because of binary compatibility issue. It should be removed under 5-CURRENT. Reviewed by: itojun Obtained from: KAME MFC after: 3 weeks
2001-06-11 12:39:29 +00:00
#ifdef INET6
Commit step 1 of the vimage project, (network stack) virtualization work done by Marko Zec (zec@). This is the first in a series of commits over the course of the next few weeks. Mark all uses of global variables to be virtualized with a V_ prefix. Use macros to map them back to their global names for now, so this is a NOP change only. We hope to have caught at least 85-90% of what is needed so we do not invalidate a lot of outstanding patches again. Obtained from: //depot/projects/vimage-commit2/... Reviewed by: brooks, des, ed, mav, julian, jamie, kris, rwatson, zec, ... (various people I forgot, different versions) md5 (with a bit of help) Sponsored by: NLnet Foundation, The FreeBSD Foundation X-MFC after: never V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
if (V_ip6_auto_flowlabel)
Sync with recent KAME. This work was based on kame-20010528-freebsd43-snap.tgz and some critical problem after the snap was out were fixed. There are many many changes since last KAME merge. TODO: - The definitions of SADB_* in sys/net/pfkeyv2.h are still different from RFC2407/IANA assignment because of binary compatibility issue. It should be fixed under 5-CURRENT. - ip6po_m member of struct ip6_pktopts is no longer used. But, it is still there because of binary compatibility issue. It should be removed under 5-CURRENT. Reviewed by: itojun Obtained from: KAME MFC after: 3 weeks
2001-06-11 12:39:29 +00:00
inp->inp_flags |= IN6P_AUTOFLOWLABEL;
#endif
Fix race conditions on enumerating pcb lists by moving the initialization ( and where appropriate the destruction) of the pcb mutex to the init/finit functions of the pcb zones. This allows locking of the pcb entries and race condition free comparison of the generation count. Rearrange locking a bit to avoid extra locking operation to update the generation count in in_pcballoc(). (in_pcballoc now returns the pcb locked) I am planning to convert pcb list handling from a type safe to a reference count model soon. ( As this allows really freeing the PCBs) Reviewed by: rwatson@, mohans@ MFC after: 1 week
2006-07-18 22:34:27 +00:00
inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
refcount_init(&inp->inp_refcount, 1); /* Reference from inpcbinfo */
Fix reference count leak with L2 caching. ip_forward, TCP/IPv6, and probably SCTP leaked references to L2 cache entry because they used their own routes on the stack, not in_pcb routes. The original model for route caching was callers that provided a route structure to ip{,6}input() would keep the route, and this model was used for L2 caching as well. Instead, change L2 caching to be done by default only when using a route structure in the in_pcb; the pcb deallocation code frees L2 as well as L3 cacches. A separate change will add route caching to TCP/IPv6. Another suggestion was to have the transport protocols indicate willingness to use L2 caching, but this approach keeps the changes in the network level Reviewed by: ae gnn MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D10059
2017-03-25 15:06:28 +00:00
/*
* Routes in inpcb's can cache L2 as well; they are guaranteed
* to be cleaned up.
*/
inp->inp_route.ro_flags = RT_LLE_CACHE;
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_LIST_WUNLOCK(pcbinfo);
Add missing check to fix the build with IPSEC_SUPPORT and without MAC. Submitted by: netchild
2017-02-14 21:33:10 +00:00
#if defined(IPSEC) || defined(IPSEC_SUPPORT) || defined(MAC)
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
out:
Cache so_cred as inp_cred in the inpcb. This means that inp_cred is always there, even after the socket has gone away. It also means that it is constant for the lifetime of the inp. Both facts lead to simpler code and possibly less locking. Suggested by: rwatson Reviewed by: rwatson MFC after: 6 weeks X-MFC Note: use a inp_pspare for inp_cred
2008-10-04 15:06:34 +00:00
if (error != 0) {
crfree(inp->inp_cred);
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
uma_zfree(pcbinfo->ipi_zone, inp);
Cache so_cred as inp_cred in the inpcb. This means that inp_cred is always there, even after the socket has gone away. It also means that it is constant for the lifetime of the inp. Both facts lead to simpler code and possibly less locking. Suggested by: rwatson Reviewed by: rwatson MFC after: 6 weeks X-MFC Note: use a inp_pspare for inp_cred
2008-10-04 15:06:34 +00:00
}
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
#endif
return (error);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
Make the PCB code compile without INET support by adding #ifdef INETs and correcting few #includes. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-30 11:04:34 +00:00
#ifdef INET
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
int
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
int anonport, error;
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK_ASSERT(inp);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
add locking assertions Supported by: FreeBSD Foundation
2003-11-08 23:02:36 +00:00
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
return (EINVAL);
Remove redundant test, we know inp_lport is 0. MFC after: 1 week
2013-01-25 20:14:27 +00:00
anonport = nam == NULL || ((struct sockaddr_in *)nam)->sin_port == 0;
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
Reduce 'td' argument to 'cred' (struct ucred) argument in those functions: - in_pcbbind(), - in_pcbbind_setup(), - in_pcbconnect(), - in_pcbconnect_setup(), - in6_pcbbind(), - in6_pcbconnect(), - in6_pcbsetport(). "It should simplify/clarify things a great deal." --rwatson Requested by: rwatson Reviewed by: rwatson, ume
2004-03-27 21:05:46 +00:00
&inp->inp_lport, cred);
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
if (error)
return (error);
if (in_pcbinshash(inp) != 0) {
inp->inp_laddr.s_addr = INADDR_ANY;
inp->inp_lport = 0;
return (EAGAIN);
}
if (anonport)
inp->inp_flags |= INP_ANONPORT;
return (0);
}
Make the PCB code compile without INET support by adding #ifdef INETs and correcting few #includes. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-30 11:04:34 +00:00
#endif
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
Add a comment and while there, fix trailing whitespace.
2014-07-29 23:42:51 +00:00
/*
* Select a local port (number) to use.
*/
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
#if defined(INET) || defined(INET6)
int
Revert r313527 Heh svn is not git
2017-02-10 05:58:16 +00:00
in_pcb_lport(struct inpcb *inp, struct in_addr *laddrp, u_short *lportp,
struct ucred *cred, int lookupflags)
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
{
struct inpcbinfo *pcbinfo;
struct inpcb *tmpinp;
unsigned short *lastport;
int count, dorandom, error;
u_short aux, first, last, lport;
#ifdef INET
struct in_addr laddr;
#endif
pcbinfo = inp->inp_pcbinfo;
/*
* Because no actual state changes occur here, a global write lock on
* the pcbinfo isn't required.
*/
INP_LOCK_ASSERT(inp);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_LOCK_ASSERT(pcbinfo);
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
if (inp->inp_flags & INP_HIGHPORT) {
first = V_ipport_hifirstauto; /* sysctl */
last = V_ipport_hilastauto;
lastport = &pcbinfo->ipi_lasthi;
} else if (inp->inp_flags & INP_LOWPORT) {
error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
if (error)
return (error);
first = V_ipport_lowfirstauto; /* 1023 */
last = V_ipport_lowlastauto; /* 600 */
lastport = &pcbinfo->ipi_lastlow;
} else {
first = V_ipport_firstauto; /* sysctl */
last = V_ipport_lastauto;
lastport = &pcbinfo->ipi_lastport;
}
/*
Add support for UDP-Lite protocol (RFC 3828) to IPv4 and IPv6 stacks. Tested with vlc and a test suite [1]. [1] http://www.erg.abdn.ac.uk/~gerrit/udp-lite/files/udplite_linux.tar.gz Reviewed by: jhb, glebius, adrian
2014-04-07 01:53:03 +00:00
* For UDP(-Lite), use random port allocation as long as the user
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
* allows it. For TCP (and as of yet unknown) connections,
* use random port allocation only if the user allows it AND
* ipport_tick() allows it.
*/
if (V_ipport_randomized &&
Add support for UDP-Lite protocol (RFC 3828) to IPv4 and IPv6 stacks. Tested with vlc and a test suite [1]. [1] http://www.erg.abdn.ac.uk/~gerrit/udp-lite/files/udplite_linux.tar.gz Reviewed by: jhb, glebius, adrian
2014-04-07 01:53:03 +00:00
(!V_ipport_stoprandom || pcbinfo == &V_udbinfo ||
pcbinfo == &V_ulitecbinfo))
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
dorandom = 1;
else
dorandom = 0;
/*
* It makes no sense to do random port allocation if
* we have the only port available.
*/
if (first == last)
dorandom = 0;
Add support for UDP-Lite protocol (RFC 3828) to IPv4 and IPv6 stacks. Tested with vlc and a test suite [1]. [1] http://www.erg.abdn.ac.uk/~gerrit/udp-lite/files/udplite_linux.tar.gz Reviewed by: jhb, glebius, adrian
2014-04-07 01:53:03 +00:00
/* Make sure to not include UDP(-Lite) packets in the count. */
if (pcbinfo != &V_udbinfo || pcbinfo != &V_ulitecbinfo)
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
V_ipport_tcpallocs++;
/*
* Instead of having two loops further down counting up or down
* make sure that first is always <= last and go with only one
* code path implementing all logic.
*/
if (first > last) {
aux = first;
first = last;
last = aux;
}
#ifdef INET
/* Make the compiler happy. */
laddr.s_addr = 0;
Properly check for an IPv4 socket after r219579. In some cases as udp6_connect() without an earlier bind(2) to an address, v4-mapped scokets allowed and a non mapped destination address, we can end up here with both v4 and v6 indicated: inp_vflag = (INP_IPV4|INP_IPV6|INP_IPV6PROTO) In that case however laddrp is NULL as the IPv6 path does not pass in a copy currently. Reported by: Pawel Worach (pawel.worach gmail.com) Tested by: Pawel Worach (pawel.worach gmail.com) MFC after: 6 days X-MFC with: r219579
2011-03-19 19:08:54 +00:00
if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4) {
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
KASSERT(laddrp != NULL, ("%s: laddrp NULL for v4 inp %p",
__func__, inp));
laddr = *laddrp;
}
#endif
Make the PCB code compile without INET support by adding #ifdef INETs and correcting few #includes. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-30 11:04:34 +00:00
tmpinp = NULL; /* Make compiler happy. */
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
lport = *lportp;
if (dorandom)
*lastport = first + (arc4random() % (last - first));
count = last - first;
do {
if (count-- < 0) /* completely used? */
return (EADDRNOTAVAIL);
++*lastport;
if (*lastport < first || *lastport > last)
*lastport = first;
lport = htons(*lastport);
#ifdef INET6
Revert r313527 Heh svn is not git
2017-02-10 05:58:16 +00:00
if ((inp->inp_vflag & INP_IPV6) != 0)
tmpinp = in6_pcblookup_local(pcbinfo,
&inp->in6p_laddr, lport, lookupflags, cred);
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
#endif
#if defined(INET) && defined(INET6)
else
#endif
#ifdef INET
Revert r313527 Heh svn is not git
2017-02-10 05:58:16 +00:00
tmpinp = in_pcblookup_local(pcbinfo, laddr,
lport, lookupflags, cred);
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
#endif
} while (tmpinp != NULL);
#ifdef INET
Properly check for an IPv4 socket after r219579. In some cases as udp6_connect() without an earlier bind(2) to an address, v4-mapped scokets allowed and a non mapped destination address, we can end up here with both v4 and v6 indicated: inp_vflag = (INP_IPV4|INP_IPV6|INP_IPV6PROTO) In that case however laddrp is NULL as the IPv6 path does not pass in a copy currently. Reported by: Pawel Worach (pawel.worach gmail.com) Tested by: Pawel Worach (pawel.worach gmail.com) MFC after: 6 days X-MFC with: r219579
2011-03-19 19:08:54 +00:00
if ((inp->inp_vflag & (INP_IPV4|INP_IPV6)) == INP_IPV4)
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
laddrp->s_addr = laddr.s_addr;
Add a comment and while there, fix trailing whitespace.
2014-07-29 23:42:51 +00:00
#endif
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
*lportp = lport;
return (0);
}
In r227207, to fix the issue with possible NULL inp_socket pointer dereferencing, when checking for SO_REUSEPORT option (and SO_REUSEADDR for multicast), INP_REUSEPORT flag was introduced to cache the socket option. It was decided then that one flag would be enough to cache both SO_REUSEPORT and SO_REUSEADDR: when processing SO_REUSEADDR setsockopt(2), it was checked if it was called for a multicast address and INP_REUSEPORT was set accordingly. Unfortunately that approach does not work when setsockopt(2) is called before binding to a multicast address: the multicast check fails and INP_REUSEPORT is not set. Fix this by adding INP_REUSEADDR flag to unconditionally cache SO_REUSEADDR. PR: 179901 Submitted by: Michael Gmelin freebsd grem.de (initial version) Reviewed by: rwatson MFC after: 1 week
2013-07-04 18:38:00 +00:00
/*
* Return cached socket options.
*/
short
inp_so_options(const struct inpcb *inp)
{
short so_options;
so_options = 0;
if ((inp->inp_flags2 & INP_REUSEPORT) != 0)
so_options |= SO_REUSEPORT;
if ((inp->inp_flags2 & INP_REUSEADDR) != 0)
so_options |= SO_REUSEADDR;
return (so_options);
}
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
#endif /* INET || INET6 */
Implement the first stage of multi-bind listen sockets and RSS socket awareness. * Introduce IP_BINDMULTI - indicating that it's okay to bind multiple sockets on the same bind details. Although the PCB code has been taught about this (see below) this patch doesn't introduce the rest of the PCB changes necessary to distribute lookups among multiple PCB entries in the global wildcard table. * Introduce IP_RSS_LISTEN_BUCKET - placing an listen socket into the given RSS bucket (and thus a single PCBGROUP hash.) * Modify the PCB add path to be aware of IP_BINDMULTI: + Only allow further PCB entries to be added if the owner credentials and IP_BINDMULTI has been specified. Ie, only allow further IP_BINDMULTI sockets to appear if the first bind() was IP_BINDMULTI. * Teach the PCBGROUP code about IP_RSS_LISTE_BUCKET marked PCB entries. Instead of using the wildcard logic and hashing, these sockets are simply placed into the PCBGROUP and _not_ in the wildcard hash. * When doing a PCBGROUP lookup, also do a wildcard match as well. This allows for an RSS bucket PCB entry to appear in a PCBGROUP rather than having to exist in the wildcard list. Tested: * TCP IPv4 server testing with igb(4) * TCP IPv4 server testing with ix(4) TODO: * The pcbgroup lookup code duplicated the wildcard and wildcard-PCB logic. This could be refactored into a single function. * This doesn't yet work for IPv6 (The PCBGROUP code in netinet6/ doesn't yet know about this); nor does it yet fully work for UDP.
2014-07-10 03:10:56 +00:00
/*
* Check if a new BINDMULTI socket is allowed to be created.
*
* ni points to the new inp.
* oi points to the exisitng inp.
*
* This checks whether the existing inp also has BINDMULTI and
* whether the credentials match.
*/
Expose in_pcbbind_check_bindmulti() so the upcoming IPv6 RSS changes can be made to use it.
2014-07-12 05:40:13 +00:00
int
Implement the first stage of multi-bind listen sockets and RSS socket awareness. * Introduce IP_BINDMULTI - indicating that it's okay to bind multiple sockets on the same bind details. Although the PCB code has been taught about this (see below) this patch doesn't introduce the rest of the PCB changes necessary to distribute lookups among multiple PCB entries in the global wildcard table. * Introduce IP_RSS_LISTEN_BUCKET - placing an listen socket into the given RSS bucket (and thus a single PCBGROUP hash.) * Modify the PCB add path to be aware of IP_BINDMULTI: + Only allow further PCB entries to be added if the owner credentials and IP_BINDMULTI has been specified. Ie, only allow further IP_BINDMULTI sockets to appear if the first bind() was IP_BINDMULTI. * Teach the PCBGROUP code about IP_RSS_LISTE_BUCKET marked PCB entries. Instead of using the wildcard logic and hashing, these sockets are simply placed into the PCBGROUP and _not_ in the wildcard hash. * When doing a PCBGROUP lookup, also do a wildcard match as well. This allows for an RSS bucket PCB entry to appear in a PCBGROUP rather than having to exist in the wildcard list. Tested: * TCP IPv4 server testing with igb(4) * TCP IPv4 server testing with ix(4) TODO: * The pcbgroup lookup code duplicated the wildcard and wildcard-PCB logic. This could be refactored into a single function. * This doesn't yet work for IPv6 (The PCBGROUP code in netinet6/ doesn't yet know about this); nor does it yet fully work for UDP.
2014-07-10 03:10:56 +00:00
in_pcbbind_check_bindmulti(const struct inpcb *ni, const struct inpcb *oi)
{
/* Check permissions match */
if ((ni->inp_flags2 & INP_BINDMULTI) &&
(ni->inp_cred->cr_uid !=
oi->inp_cred->cr_uid))
return (0);
/* Check the existing inp has BINDMULTI set */
if ((ni->inp_flags2 & INP_BINDMULTI) &&
((oi->inp_flags2 & INP_BINDMULTI) == 0))
return (0);
/*
* We're okay - either INP_BINDMULTI isn't set on ni, or
* it is and it matches the checks.
*/
return (1);
}
Expose in_pcbbind_check_bindmulti() so the upcoming IPv6 RSS changes can be made to use it.
2014-07-12 05:40:13 +00:00
#ifdef INET
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
/*
* Set up a bind operation on a PCB, performing port allocation
* as required, but do not actually modify the PCB. Callers can
* either complete the bind by setting inp_laddr/inp_lport and
* calling in_pcbinshash(), or they can just use the resulting
* port and address to authorise the sending of a once-off packet.
*
* On error, the values of *laddrp and *lportp are not changed.
*/
int
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
u_short *lportp, struct ucred *cred)
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
{
struct socket *so = inp->inp_socket;
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
struct sockaddr_in *sin;
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
struct in_addr laddr;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
u_short lport = 0;
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
int lookupflags = 0, reuseport = (so->so_options & SO_REUSEPORT);
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
int error;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
/*
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
* No state changes, so read locks are sufficient here.
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
*/
add locking assertions Supported by: FreeBSD Foundation
2003-11-08 23:02:36 +00:00
INP_LOCK_ASSERT(inp);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_LOCK_ASSERT(pcbinfo);
add locking assertions Supported by: FreeBSD Foundation
2003-11-08 23:02:36 +00:00
Commit step 1 of the vimage project, (network stack) virtualization work done by Marko Zec (zec@). This is the first in a series of commits over the course of the next few weeks. Mark all uses of global variables to be virtualized with a V_ prefix. Use macros to map them back to their global names for now, so this is a NOP change only. We hope to have caught at least 85-90% of what is needed so we do not invalidate a lot of outstanding patches again. Obtained from: //depot/projects/vimage-commit2/... Reviewed by: brooks, des, ed, mav, julian, jamie, kris, rwatson, zec, ... (various people I forgot, different versions) md5 (with a bit of help) Sponsored by: NLnet Foundation, The FreeBSD Foundation X-MFC after: never V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
if (TAILQ_EMPTY(&V_in_ifaddrhead)) /* XXX broken! */
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (EADDRNOTAVAIL);
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
laddr.s_addr = *laddrp;
if (nam != NULL && laddr.s_addr != INADDR_ANY)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (EINVAL);
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
lookupflags = INPLOOKUP_WILDCARD;
Revert r313527 Heh svn is not git
2017-02-10 05:58:16 +00:00
if (nam == NULL) {
Remove redundant calls of prison_local_ip4 in in_pcbbind_setup, and of prison_local_ip6 in in6_pcbbind. Approved by: bz (mentor)
2009-02-05 14:25:53 +00:00
if ((error = prison_local_ip4(cred, &laddr)) != 0)
return (error);
} else {
Fix all areas of the system (or at least all those in LINT) to avoid storing socket addresses in mbufs. (Socket buffers are the one exception.) A number of kernel APIs needed to get fixed in order to make this happen. Also, fix three protocol families which kept PCBs in mbufs to not malloc them instead. Delete some old compatibility cruft while we're at it, and add some new routines in the in_cksum family.
1997-08-16 19:16:27 +00:00
sin = (struct sockaddr_in *)nam;
if (nam->sa_len != sizeof (*sin))
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (EINVAL);
#ifdef notdef
/*
* We should check the family, but old programs
* incorrectly fail to initialize it.
*/
if (sin->sin_family != AF_INET)
return (EAFNOSUPPORT);
#endif
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
error = prison_local_ip4(cred, &sin->sin_addr);
if (error)
return (error);
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
if (sin->sin_port != *lportp) {
/* Don't allow the port to change. */
if (*lportp != 0)
return (EINVAL);
lport = sin->sin_port;
}
/* NB: lport is left as 0 if the port isn't being changed. */
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
/*
* Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
* allow complete duplication of binding if
* SO_REUSEPORT is set, or if SO_REUSEADDR is set
* and a multicast address is bound on both
* new and duplicated sockets.
*/
A complete duplication of binding should be allowed if on both new and duplicated sockets a multicast address is bound and either SO_REUSEPORT or SO_REUSEADDR is set. But actually it works for the following combinations: * SO_REUSEPORT is set for the fist socket and SO_REUSEPORT for the new; * SO_REUSEADDR is set for the fist socket and SO_REUSEADDR for the new; * SO_REUSEPORT is set for the fist socket and SO_REUSEADDR for the new; and fails for this: * SO_REUSEADDR is set for the fist socket and SO_REUSEPORT for the new. Fix the last case. PR: 179901 MFC after: 1 month
2013-07-12 19:08:33 +00:00
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
reuseport = SO_REUSEADDR|SO_REUSEPORT;
} else if (sin->sin_addr.s_addr != INADDR_ANY) {
sin->sin_port = 0; /* yech... */
- Fixes non-zero'd out sin_zero field problem so that the padding is used as it is supposed to be. Inspired by: PR #31704 Approved by: jdp Reviewed by: jhb, -net@
2001-11-06 00:48:01 +00:00
bzero(&sin->sin_zero, sizeof(sin->sin_zero));
Comment some potentially confusing logic. Nitpicking by: mlaier MFC after: 2 weeks
2009-01-09 17:16:18 +00:00
/*
* Is the address a local IP address?
- Rename IP_NONLOCALOK IP socket option to IP_BINDANY, to be more consistent with OpenBSD (and BSD/OS originally). We can't easly do it SOL_SOCKET option as there is no more space for more SOL_SOCKET options, but this option also fits better as an IP socket option, it seems. - Implement this functionality also for IPv6 and RAW IP sockets. - Always compile it in (don't use additional kernel options). - Remove sysctl to turn this functionality on and off. - Introduce new privilege - PRIV_NETINET_BINDANY, which allows to use this functionality (currently only unjail root can use it). Discussed with: julian, adrian, jhb, rwatson, kmacy
2009-06-01 10:30:00 +00:00
* If INP_BINDANY is set, then the socket may be bound
Fix fat-fingered comment. Noticed-by: julian
2009-01-09 18:38:57 +00:00
* to any endpoint address, local or not.
Comment some potentially confusing logic. Nitpicking by: mlaier MFC after: 2 weeks
2009-01-09 17:16:18 +00:00
*/
- Rename IP_NONLOCALOK IP socket option to IP_BINDANY, to be more consistent with OpenBSD (and BSD/OS originally). We can't easly do it SOL_SOCKET option as there is no more space for more SOL_SOCKET options, but this option also fits better as an IP socket option, it seems. - Implement this functionality also for IPv6 and RAW IP sockets. - Always compile it in (don't use additional kernel options). - Remove sysctl to turn this functionality on and off. - Introduce new privilege - PRIV_NETINET_BINDANY, which allows to use this functionality (currently only unjail root can use it). Discussed with: julian, adrian, jhb, rwatson, kmacy
2009-06-01 10:30:00 +00:00
if ((inp->inp_flags & INP_BINDANY) == 0 &&
Add a new function, ifa_ifwithaddr_check(), which rather than returning a pointer to an ifaddr matching the passed socket address, returns a boolean indicating whether one was present. In the (near) future, ifa_ifwithaddr() will return a referenced ifaddr rather than a raw ifaddr pointer, and the new wrapper will allow callers that care only about the boolean condition to avoid having to free that reference. MFC after: 3 weeks
2009-06-22 10:59:34 +00:00
ifa_ifwithaddr_check((struct sockaddr *)sin) == 0)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (EADDRNOTAVAIL);
}
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
laddr = sin->sin_addr;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (lport) {
struct inpcb *t;
Before dereferencing intotw() when INP_TIMEWAIT, check for inp_ppcb being NULL. We currently do allow this to happen, but may want to remove that possibility in the future. This case can occur when a socket is left open after TCP wraps up, and the timewait state is recycled. This will be cleaned up in the future. Found by: Kazuaki Oda <kaakun at highway dot ne dot jp> MFC after: 3 months
2006-04-04 12:26:07 +00:00
struct tcptw *tw;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/* GROSS */
Commit step 1 of the vimage project, (network stack) virtualization work done by Marko Zec (zec@). This is the first in a series of commits over the course of the next few weeks. Mark all uses of global variables to be virtualized with a V_ prefix. Use macros to map them back to their global names for now, so this is a NOP change only. We hope to have caught at least 85-90% of what is needed so we do not invalidate a lot of outstanding patches again. Obtained from: //depot/projects/vimage-commit2/... Reviewed by: brooks, des, ed, mav, julian, jamie, kris, rwatson, zec, ... (various people I forgot, different versions) md5 (with a bit of help) Sponsored by: NLnet Foundation, The FreeBSD Foundation X-MFC after: never V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
if (ntohs(lport) <= V_ipport_reservedhigh &&
ntohs(lport) >= V_ipport_reservedlow &&
Sweep kernel replacing suser(9) calls with priv(9) calls, assigning specific privilege names to a broad range of privileges. These may require some future tweaking. Sponsored by: nCircle Network Security, Inc. Obtained from: TrustedBSD Project Discussed on: arch@ Reviewed (at least in part) by: mlaier, jmg, pjd, bde, ceri, Alex Lyashkov <umka at sevcity dot net>, Skip Ford <skip dot ford at verizon dot net>, Antoine Brodin <antoine dot brodin at laposte dot net>
2006-11-06 13:42:10 +00:00
priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
Eliminate now-unused SUSER_ALLOWJAIL arguments to priv_check_cred(); in some cases, move to priv_check() if it was an operation on a thread and no other flags were present. Eliminate caller-side jail exception checking (also now-unused); jail privilege exception code now goes solely in kern_jail.c. We can't yet eliminate suser() due to some cases in the KAME code where a privilege check is performed and then used in many different deferred paths. Do, however, move those prototypes to priv.h. Reviewed by: csjp Obtained from: TrustedBSD Project
2007-06-12 00:12:01 +00:00
0))
Merge 4.4-Lite-2: use M_NOWAIT in in_pcballoc(), and return EACCES rather than EPERM on illegal attempt to bind a reserved port. Obtained from: 4.4BSD-Lite-2
1995-09-21 17:55:49 +00:00
return (EACCES);
- Use suser_cred(9) instead of directly checking cr_uid. - Change the order of conditions to first verify that we actually need to check for privileges and then eventually check them. Reviewed by: rwatson
2006-06-27 11:35:53 +00:00
if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
Cache so_cred as inp_cred in the inpcb. This means that inp_cred is always there, even after the socket has gone away. It also means that it is constant for the lifetime of the inp. Both facts lead to simpler code and possibly less locking. Suggested by: rwatson Reviewed by: rwatson MFC after: 6 weeks X-MFC Note: use a inp_pspare for inp_cred
2008-10-04 15:06:34 +00:00
priv_check_cred(inp->inp_cred,
Eliminate now-unused SUSER_ALLOWJAIL arguments to priv_check_cred(); in some cases, move to priv_check() if it was an operation on a thread and no other flags were present. Eliminate caller-side jail exception checking (also now-unused); jail privilege exception code now goes solely in kern_jail.c. We can't yet eliminate suser() due to some cases in the KAME code where a privilege check is performed and then used in many different deferred paths. Do, however, move those prototypes to priv.h. Reviewed by: csjp Obtained from: TrustedBSD Project
2007-06-12 00:12:01 +00:00
PRIV_NETINET_REUSEPORT, 0) != 0) {
Pass the ucred along into in{,6}_pcblookup_local for upcoming prison checks. Reviewed by: rwatson
2008-07-10 13:31:11 +00:00
t = in_pcblookup_local(pcbinfo, sin->sin_addr,
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
lport, INPLOOKUP_WILDCARD, cred);
Add a TCP TIMEWAIT state which uses less space than a fullblown TCP control block. Allow the socket and tcpcb structures to be freed earlier than inpcb. Update code to understand an inp w/o a socket. Reviewed by: hsu, silby, jayanth Sponsored by: DARPA, NAI Labs
2003-02-19 22:32:43 +00:00
/*
* XXX
* This entire block sorely needs a rewrite.
*/
Back out my lats commit of locking down a socket, it conflicts with hsu's work. Requested by: hsu
2002-05-31 11:52:35 +00:00
if (t &&
Implement the first stage of multi-bind listen sockets and RSS socket awareness. * Introduce IP_BINDMULTI - indicating that it's okay to bind multiple sockets on the same bind details. Although the PCB code has been taught about this (see below) this patch doesn't introduce the rest of the PCB changes necessary to distribute lookups among multiple PCB entries in the global wildcard table. * Introduce IP_RSS_LISTEN_BUCKET - placing an listen socket into the given RSS bucket (and thus a single PCBGROUP hash.) * Modify the PCB add path to be aware of IP_BINDMULTI: + Only allow further PCB entries to be added if the owner credentials and IP_BINDMULTI has been specified. Ie, only allow further IP_BINDMULTI sockets to appear if the first bind() was IP_BINDMULTI. * Teach the PCBGROUP code about IP_RSS_LISTE_BUCKET marked PCB entries. Instead of using the wildcard logic and hashing, these sockets are simply placed into the PCBGROUP and _not_ in the wildcard hash. * When doing a PCBGROUP lookup, also do a wildcard match as well. This allows for an RSS bucket PCB entry to appear in a PCBGROUP rather than having to exist in the wildcard list. Tested: * TCP IPv4 server testing with igb(4) * TCP IPv4 server testing with ix(4) TODO: * The pcbgroup lookup code duplicated the wildcard and wildcard-PCB logic. This could be refactored into a single function. * This doesn't yet work for IPv6 (The PCBGROUP code in netinet6/ doesn't yet know about this); nor does it yet fully work for UDP.
2014-07-10 03:10:56 +00:00
((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
Correct a number of evolved problems with inp_vflag and inp_flags: certain flags that should have been in inp_flags ended up in inp_vflag, meaning that they were inconsistently locked, and in one case, interpreted. Move the following flags from inp_vflag to gaps in the inp_flags space (and clean up the inp_flags constants to make gaps more obvious to future takers): INP_TIMEWAIT INP_SOCKREF INP_ONESBCAST INP_DROPPED Some aspects of this change have no effect on kernel ABI at all, as these are UDP/TCP/IP-internal uses; however, netstat and sockstat detect INP_TIMEWAIT when listing TCP sockets, so any MFC will need to take this into account. MFC after: 1 week (or after dependencies are MFC'd) Reviewed by: bz
2009-03-15 09:58:31 +00:00
((t->inp_flags & INP_TIMEWAIT) == 0) &&
When checking for possible port theft, skip over a TCP inpcb unless it's in the closed or listening state (remote address == INADDR_ANY). If a TCP inpcb is in any other state, it's impossible to steal its local port or use it for port theft. And if there are both closed/listening and connected TCP inpcbs on the same localIP:port couple, the call to in_pcblookup_local() will find the former due to the design of that function. No objections raised in: -net, -arch MFC after: 1 month
2004-05-20 06:35:02 +00:00
(so->so_type != SOCK_STREAM ||
ntohl(t->inp_faddr.s_addr) == INADDR_ANY) &&
Back out my lats commit of locking down a socket, it conflicts with hsu's work. Requested by: hsu
2002-05-31 11:52:35 +00:00
(ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
Cache SO_REUSEPORT socket option in inpcb-layer in order to avoid inp_socket->so_options dereference when we may not acquire the lock on the inpcb. This fixes the crash due to NULL pointer dereference in in_pcbbind_setup() when inp_socket->so_options in a pcb returned by in_pcblookup_local() was checked. Reported by: dave jones <s.dave.jones@gmail.com>, Arnaud Lacombe <lacombar@gmail.com> Suggested by: rwatson Glanced by: rwatson Tested by: dave jones <s.dave.jones@gmail.com>
2011-11-06 10:47:20 +00:00
(t->inp_flags2 & INP_REUSEPORT) == 0) &&
Cache so_cred as inp_cred in the inpcb. This means that inp_cred is always there, even after the socket has gone away. It also means that it is constant for the lifetime of the inp. Both facts lead to simpler code and possibly less locking. Suggested by: rwatson Reviewed by: rwatson MFC after: 6 weeks X-MFC Note: use a inp_pspare for inp_cred
2008-10-04 15:06:34 +00:00
(inp->inp_cred->cr_uid !=
t->inp_cred->cr_uid))
Back out my lats commit of locking down a socket, it conflicts with hsu's work. Requested by: hsu
2002-05-31 11:52:35 +00:00
return (EADDRINUSE);
Implement the first stage of multi-bind listen sockets and RSS socket awareness. * Introduce IP_BINDMULTI - indicating that it's okay to bind multiple sockets on the same bind details. Although the PCB code has been taught about this (see below) this patch doesn't introduce the rest of the PCB changes necessary to distribute lookups among multiple PCB entries in the global wildcard table. * Introduce IP_RSS_LISTEN_BUCKET - placing an listen socket into the given RSS bucket (and thus a single PCBGROUP hash.) * Modify the PCB add path to be aware of IP_BINDMULTI: + Only allow further PCB entries to be added if the owner credentials and IP_BINDMULTI has been specified. Ie, only allow further IP_BINDMULTI sockets to appear if the first bind() was IP_BINDMULTI. * Teach the PCBGROUP code about IP_RSS_LISTE_BUCKET marked PCB entries. Instead of using the wildcard logic and hashing, these sockets are simply placed into the PCBGROUP and _not_ in the wildcard hash. * When doing a PCBGROUP lookup, also do a wildcard match as well. This allows for an RSS bucket PCB entry to appear in a PCBGROUP rather than having to exist in the wildcard list. Tested: * TCP IPv4 server testing with igb(4) * TCP IPv4 server testing with ix(4) TODO: * The pcbgroup lookup code duplicated the wildcard and wildcard-PCB logic. This could be refactored into a single function. * This doesn't yet work for IPv6 (The PCBGROUP code in netinet6/ doesn't yet know about this); nor does it yet fully work for UDP.
2014-07-10 03:10:56 +00:00
/*
* If the socket is a BINDMULTI socket, then
* the credentials need to match and the
* original socket also has to have been bound
* with BINDMULTI.
*/
if (t && (! in_pcbbind_check_bindmulti(inp, t)))
return (EADDRINUSE);
Make sure that you can only bind a more specific address when it is done by the same uid. Obtained from: OpenBSD
1998-03-01 19:39:29 +00:00
}
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
t = in_pcblookup_local(pcbinfo, sin->sin_addr,
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
lport, lookupflags, cred);
Correct a number of evolved problems with inp_vflag and inp_flags: certain flags that should have been in inp_flags ended up in inp_vflag, meaning that they were inconsistently locked, and in one case, interpreted. Move the following flags from inp_vflag to gaps in the inp_flags space (and clean up the inp_flags constants to make gaps more obvious to future takers): INP_TIMEWAIT INP_SOCKREF INP_ONESBCAST INP_DROPPED Some aspects of this change have no effect on kernel ABI at all, as these are UDP/TCP/IP-internal uses; however, netstat and sockstat detect INP_TIMEWAIT when listing TCP sockets, so any MFC will need to take this into account. MFC after: 1 week (or after dependencies are MFC'd) Reviewed by: bz
2009-03-15 09:58:31 +00:00
if (t && (t->inp_flags & INP_TIMEWAIT)) {
Before dereferencing intotw() when INP_TIMEWAIT, check for inp_ppcb being NULL. We currently do allow this to happen, but may want to remove that possibility in the future. This case can occur when a socket is left open after TCP wraps up, and the timewait state is recycled. This will be cleaned up in the future. Found by: Kazuaki Oda <kaakun at highway dot ne dot jp> MFC after: 3 months
2006-04-04 12:26:07 +00:00
/*
* XXXRW: If an incpb has had its timewait
* state recycled, we treat the address as
* being in use (for now). This is better
* than a panic, but not desirable.
*/
Fix the typo made in r157474. MFC after: 3 days
2011-11-06 09:17:48 +00:00
tw = intotw(t);
Before dereferencing intotw() when INP_TIMEWAIT, check for inp_ppcb being NULL. We currently do allow this to happen, but may want to remove that possibility in the future. This case can occur when a socket is left open after TCP wraps up, and the timewait state is recycled. This will be cleaned up in the future. Found by: Kazuaki Oda <kaakun at highway dot ne dot jp> MFC after: 3 months
2006-04-04 12:26:07 +00:00
if (tw == NULL ||
(reuseport & tw->tw_so_options) == 0)
Add a TCP TIMEWAIT state which uses less space than a fullblown TCP control block. Allow the socket and tcpcb structures to be freed earlier than inpcb. Update code to understand an inp w/o a socket. Reviewed by: hsu, silby, jayanth Sponsored by: DARPA, NAI Labs
2003-02-19 22:32:43 +00:00
return (EADDRINUSE);
Implement the first stage of multi-bind listen sockets and RSS socket awareness. * Introduce IP_BINDMULTI - indicating that it's okay to bind multiple sockets on the same bind details. Although the PCB code has been taught about this (see below) this patch doesn't introduce the rest of the PCB changes necessary to distribute lookups among multiple PCB entries in the global wildcard table. * Introduce IP_RSS_LISTEN_BUCKET - placing an listen socket into the given RSS bucket (and thus a single PCBGROUP hash.) * Modify the PCB add path to be aware of IP_BINDMULTI: + Only allow further PCB entries to be added if the owner credentials and IP_BINDMULTI has been specified. Ie, only allow further IP_BINDMULTI sockets to appear if the first bind() was IP_BINDMULTI. * Teach the PCBGROUP code about IP_RSS_LISTE_BUCKET marked PCB entries. Instead of using the wildcard logic and hashing, these sockets are simply placed into the PCBGROUP and _not_ in the wildcard hash. * When doing a PCBGROUP lookup, also do a wildcard match as well. This allows for an RSS bucket PCB entry to appear in a PCBGROUP rather than having to exist in the wildcard list. Tested: * TCP IPv4 server testing with igb(4) * TCP IPv4 server testing with ix(4) TODO: * The pcbgroup lookup code duplicated the wildcard and wildcard-PCB logic. This could be refactored into a single function. * This doesn't yet work for IPv6 (The PCBGROUP code in netinet6/ doesn't yet know about this); nor does it yet fully work for UDP.
2014-07-10 03:10:56 +00:00
} else if (t &&
((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
(reuseport & inp_so_options(t)) == 0) {
Consistently use #ifdef INET6 rather than mixing and matching with #if defined(INET6). Don't comment the end of short #ifdef blocks. Comment cleanup. Line wrap.
2006-11-30 10:54:54 +00:00
#ifdef INET6
Back out my lats commit of locking down a socket, it conflicts with hsu's work. Requested by: hsu
2002-05-31 11:52:35 +00:00
if (ntohl(sin->sin_addr.s_addr) !=
INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) !=
INADDR_ANY ||
Cache SO_REUSEPORT socket option in inpcb-layer in order to avoid inp_socket->so_options dereference when we may not acquire the lock on the inpcb. This fixes the crash due to NULL pointer dereference in in_pcbbind_setup() when inp_socket->so_options in a pcb returned by in_pcblookup_local() was checked. Reported by: dave jones <s.dave.jones@gmail.com>, Arnaud Lacombe <lacombar@gmail.com> Suggested by: rwatson Glanced by: rwatson Tested by: dave jones <s.dave.jones@gmail.com>
2011-11-06 10:47:20 +00:00
(inp->inp_vflag & INP_IPV6PROTO) == 0 ||
(t->inp_vflag & INP_IPV6PROTO) == 0)
Consistently use #ifdef INET6 rather than mixing and matching with #if defined(INET6). Don't comment the end of short #ifdef blocks. Comment cleanup. Line wrap.
2006-11-30 10:54:54 +00:00
#endif
Back out my lats commit of locking down a socket, it conflicts with hsu's work. Requested by: hsu
2002-05-31 11:52:35 +00:00
return (EADDRINUSE);
Implement the first stage of multi-bind listen sockets and RSS socket awareness. * Introduce IP_BINDMULTI - indicating that it's okay to bind multiple sockets on the same bind details. Although the PCB code has been taught about this (see below) this patch doesn't introduce the rest of the PCB changes necessary to distribute lookups among multiple PCB entries in the global wildcard table. * Introduce IP_RSS_LISTEN_BUCKET - placing an listen socket into the given RSS bucket (and thus a single PCBGROUP hash.) * Modify the PCB add path to be aware of IP_BINDMULTI: + Only allow further PCB entries to be added if the owner credentials and IP_BINDMULTI has been specified. Ie, only allow further IP_BINDMULTI sockets to appear if the first bind() was IP_BINDMULTI. * Teach the PCBGROUP code about IP_RSS_LISTE_BUCKET marked PCB entries. Instead of using the wildcard logic and hashing, these sockets are simply placed into the PCBGROUP and _not_ in the wildcard hash. * When doing a PCBGROUP lookup, also do a wildcard match as well. This allows for an RSS bucket PCB entry to appear in a PCBGROUP rather than having to exist in the wildcard list. Tested: * TCP IPv4 server testing with igb(4) * TCP IPv4 server testing with ix(4) TODO: * The pcbgroup lookup code duplicated the wildcard and wildcard-PCB logic. This could be refactored into a single function. * This doesn't yet work for IPv6 (The PCBGROUP code in netinet6/ doesn't yet know about this); nor does it yet fully work for UDP.
2014-07-10 03:10:56 +00:00
if (t && (! in_pcbbind_check_bindmulti(inp, t)))
return (EADDRINUSE);
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
}
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
if (*lportp != 0)
lport = *lportp;
Make the default behavior of local port assignment match traditional systems (my last change did not mix well with some firewall configurations). As much as I dislike firewalls, this is one thing I I was not prepared to break by default.. :-) Allow the user to nominate one of three ranges of port numbers as candidates for selecting a local address to replace a zero port number. The ranges are selected via a setsockopt(s, IPPROTO_IP, IP_PORTRANGE, &arg) call. The three ranges are: default, high (to bypass firewalls) and low (to get a port below 1024). The default and high port ranges are sysctl settable under sysctl net.inet.ip.portrange.* This code also fixes a potential deadlock if the system accidently ran out of local port addresses. It'd drop into an infinite while loop. The secure port selection (for root) should reduce overheads and increase reliability of rlogin/rlogind/rsh/rshd if they are modified to take advantage of it. Partly suggested by: pst Reviewed by: wollman
1996-02-22 21:32:23 +00:00
if (lport == 0) {
Revert r313527 Heh svn is not git
2017-02-10 05:58:16 +00:00
error = in_pcb_lport(inp, &laddr, &lport, cred, lookupflags);
Merge the two identical implementations for local port selections from in_pcbbind_setup() and in6_pcbsetport() in a single in_pcb_lport(). MFC after: 2 weeks
2011-03-12 21:46:37 +00:00
if (error != 0)
return (error);
Change the default port range for outgoing connections by introducing IPPORT_EPHEMERALFIRST and IPPORT_EPHEMERALLAST with values 10000 and 65535 respectively. The rationale behind is that it makes the attacker's life more difficult if he/she wants to guess the ephemeral port range and also lowers the probability of a port colision (described in draft-ietf-tsvwg-port-randomization-01.txt). While there, remove code duplication in in_pcbbind_setup(). Submitted by: Fernando Gont <fernando at gont.com.ar> Approved by: njl (mentor) Reviewed by: silby, bms Discussed on: freebsd-net
2008-03-04 19:16:21 +00:00
Make the default behavior of local port assignment match traditional systems (my last change did not mix well with some firewall configurations). As much as I dislike firewalls, this is one thing I I was not prepared to break by default.. :-) Allow the user to nominate one of three ranges of port numbers as candidates for selecting a local address to replace a zero port number. The ranges are selected via a setsockopt(s, IPPROTO_IP, IP_PORTRANGE, &arg) call. The three ranges are: default, high (to bypass firewalls) and low (to get a port below 1024). The default and high port ranges are sysctl settable under sysctl net.inet.ip.portrange.* This code also fixes a potential deadlock if the system accidently ran out of local port addresses. It'd drop into an infinite while loop. The secure port selection (for root) should reduce overheads and increase reliability of rlogin/rlogind/rsh/rshd if they are modified to take advantage of it. Partly suggested by: pst Reviewed by: wollman
1996-02-22 21:32:23 +00:00
}
Split out most of the logic from in_pcbbind() into a new function called in_pcbbind_setup() that does everything except commit the changes to the PCB. There should be no functional change here, but in_pcbbind_setup() will be used by the soon-to-appear IP_SENDSRCADDR control message implementation to check or allocate the source address and port. Discussed on: -net Approved by: re
2002-10-20 21:44:31 +00:00
*laddrp = laddr.s_addr;
*lportp = lport;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (0);
}
T/TCP changes to generic IP code. This is all ifdefed TTCP so should have no effect on most users for now. (Eventually, once this code is fully tested, the ifdefs will go away.)
1995-02-08 20:22:09 +00:00
/*
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
* Connect from a socket to a specified address.
* Both address and port must be specified in argument sin.
* If don't have a local address for this socket yet,
* then pick one.
T/TCP changes to generic IP code. This is all ifdefed TTCP so should have no effect on most users for now. (Eventually, once this code is fully tested, the ifdefs will go away.)
1995-02-08 20:22:09 +00:00
*/
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
int
Add _mbuf() variants of various inpcb-related interfaces, including lookup, hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-04 16:33:06 +00:00
in_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
struct ucred *cred, struct mbuf *m)
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
{
u_short lport, fport;
in_addr_t laddr, faddr;
int anonport, error;
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK_ASSERT(inp);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
Assert the locks of inpcbinfo's and inpcb's passed into in_pcbconnect() and in_pcbconnect_setup(), since these functions frob the port and address state of inpcbs.
2004-08-11 04:35:20 +00:00
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
lport = inp->inp_lport;
laddr = inp->inp_laddr.s_addr;
anonport = (lport == 0);
error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
Reduce 'td' argument to 'cred' (struct ucred) argument in those functions: - in_pcbbind(), - in_pcbbind_setup(), - in_pcbconnect(), - in_pcbconnect_setup(), - in6_pcbbind(), - in6_pcbconnect(), - in6_pcbsetport(). "It should simplify/clarify things a great deal." --rwatson Requested by: rwatson Reviewed by: rwatson, ume
2004-03-27 21:05:46 +00:00
NULL, cred);
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
if (error)
return (error);
/* Do the initial binding of the local address if required. */
if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
inp->inp_lport = lport;
inp->inp_laddr.s_addr = laddr;
if (in_pcbinshash(inp) != 0) {
inp->inp_laddr.s_addr = INADDR_ANY;
inp->inp_lport = 0;
return (EAGAIN);
}
}
/* Commit the remaining changes. */
inp->inp_lport = lport;
inp->inp_laddr.s_addr = laddr;
inp->inp_faddr.s_addr = faddr;
inp->inp_fport = fport;
Add _mbuf() variants of various inpcb-related interfaces, including lookup, hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-04 16:33:06 +00:00
in_pcbrehash_mbuf(inp, m);
Commit IPv6 support for FAST_IPSEC to the tree. This commit includes only the kernel files, the rest of the files will follow in a second commit. Reviewed by: bz Approved by: re Supported by: Secure Computing
2007-07-01 11:41:27 +00:00
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
if (anonport)
inp->inp_flags |= INP_ANONPORT;
return (0);
}
T/TCP changes to generic IP code. This is all ifdefed TTCP so should have no effect on most users for now. (Eventually, once this code is fully tested, the ifdefs will go away.)
1995-02-08 20:22:09 +00:00
Add _mbuf() variants of various inpcb-related interfaces, including lookup, hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-04 16:33:06 +00:00
int
in_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
{
return (in_pcbconnect_mbuf(inp, nam, cred, NULL));
}
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
/*
* Do proper source address selection on an unbound socket in case
* of connect. Take jails into account as well.
*/
Fix jailed raw sockets not setting the correct source address by calling in_pcbladdr instead of prison_get_ip4 MFC after: 1 month
2014-04-24 12:52:31 +00:00
int
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
in_pcbladdr(struct inpcb *inp, struct in_addr *faddr, struct in_addr *laddr,
struct ucred *cred)
{
struct ifaddr *ifa;
struct sockaddr *sa;
struct sockaddr_in *sin;
struct route sro;
int error;
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
KASSERT(laddr != NULL, ("%s: laddr NULL", __func__));
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
Add ip4.saddrsel/ip4.nosaddrsel (and equivalent for ip6) to control whether to use source address selection (default) or the primary jail address for unbound outgoing connections. This is intended to be used by people upgrading from single-IP jails to multi-IP jails but not having to change firewall rules, application ACLs, ... but to force their connections (unless otherwise changed) to the primry jail IP they had been used for years, as well as for people prefering to implement similar policies. Note that for IPv6, if configured incorrectly, this might lead to scope violations, which single-IPv6 jails could as well, as by the design of jails. [1] Reviewed by: jamie, hrs (ipv6 part) Pointed out by: hrs [1] MFC After: 2 weeks Asked for by: Jase Thew (bazerka beardz.net)
2010-01-17 12:57:11 +00:00
/*
* Bypass source address selection and use the primary jail IP
* if requested.
*/
if (cred != NULL && !prison_saddrsel_ip4(cred, laddr))
return (0);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
error = 0;
bzero(&sro, sizeof(sro));
sin = (struct sockaddr_in *)&sro.ro_dst;
sin->sin_family = AF_INET;
sin->sin_len = sizeof(struct sockaddr_in);
sin->sin_addr.s_addr = faddr->s_addr;
/*
* If route is known our src addr is taken from the i/f,
* else punt.
*
* Find out route to destination.
*/
if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0)
This main goals of this project are: 1. separating L2 tables (ARP, NDP) from the L3 routing tables 2. removing as much locking dependencies among these layers as possible to allow for some parallelism in the search operations 3. simplify the logic in the routing code, The most notable end result is the obsolescent of the route cloning (RTF_CLONING) concept, which translated into code reduction in both IPv4 ARP and IPv6 NDP related modules, and size reduction in struct rtentry{}. The change in design obsoletes the semantics of RTF_CLONING, RTF_WASCLONE and RTF_LLINFO routing flags. The userland applications such as "arp" and "ndp" have been modified to reflect those changes. The output from "netstat -r" shows only the routing entries. Quite a few developers have contributed to this project in the past: Glebius Smirnoff, Luigi Rizzo, Alessandro Cerri, and Andre Oppermann. And most recently: - Kip Macy revised the locking code completely, thus completing the last piece of the puzzle, Kip has also been conducting active functional testing - Sam Leffler has helped me improving/refactoring the code, and provided valuable reviews - Julian Elischer setup the perforce tree for me and has helped me maintaining that branch before the svn conversion
2008-12-15 06:10:57 +00:00
in_rtalloc_ign(&sro, 0, inp->inp_inc.inc_fibnum);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
/*
* If we found a route, use the address corresponding to
* the outgoing interface.
*
* Otherwise assume faddr is reachable on a directly connected
* network and try to find a corresponding interface to take
* the source address from.
*/
if (sro.ro_rt == NULL || sro.ro_rt->rt_ifp == NULL) {
Modify most routines returning 'struct ifaddr *' to return references rather than pointers, requiring callers to properly dispose of those references. The following routines now return references: ifaddr_byindex ifa_ifwithaddr ifa_ifwithbroadaddr ifa_ifwithdstaddr ifa_ifwithnet ifaof_ifpforaddr ifa_ifwithroute ifa_ifwithroute_fib rt_getifa rt_getifa_fib IFP_TO_IA ip_rtaddr in6_ifawithifp in6ifa_ifpforlinklocal in6ifa_ifpwithaddr in6_ifadd carp_iamatch6 ip6_getdstifaddr Remove unused macro which didn't have required referencing: IFP_TO_IA6 This closes many small races in which changes to interface or address lists while an ifaddr was in use could lead to use of freed memory (etc). In a few cases, add missing if_addr_list locking required to safely acquire references. Because of a lack of deep copying support, we accept a race in which an in6_ifaddr pointed to by mbuf tags and extracted with ip6_getdstifaddr() doesn't hold a reference while in transmit. Once we have mbuf tag deep copy support, this can be fixed. Reviewed by: bz Obtained from: Apple, Inc. (portions) MFC after: 6 weeks (portions)
2009-06-23 20:19:09 +00:00
struct in_ifaddr *ia;
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
struct ifnet *ifp;
Revisions 264905 and 266860 added a "int fib" argument to ifa_ifwithnet and ifa_ifwithdstaddr. For the sake of backwards compatibility, the new arguments were added to new functions named ifa_ifwithnet_fib and ifa_ifwithdstaddr_fib, while the old functions became wrappers around the new ones that passed RT_ALL_FIBS for the fib argument. However, the backwards compatibility is not desired for FreeBSD 11, because there are numerous other incompatible changes to the ifnet(9) API. We therefore decided to remove it from head but leave it in place for stable/9 and stable/10. In addition, this commit adds the fib argument to ifa_ifwithbroadaddr for consistency's sake. sys/sys/param.h Increment __FreeBSD_version sys/net/if.c sys/net/if_var.h sys/net/route.c Add fibnum argument to ifa_ifwithbroadaddr, and remove the _fib versions of ifa_ifwithdstaddr, ifa_ifwithnet, and ifa_ifwithroute. sys/net/route.c sys/net/rtsock.c sys/netinet/in_pcb.c sys/netinet/ip_options.c sys/netinet/ip_output.c sys/netinet6/nd6.c Fixup calls of modified functions. share/man/man9/ifnet.9 Document changed API. CR: https://reviews.freebsd.org/D458 MFC after: Never Sponsored by: Spectra Logic
2014-09-11 20:21:03 +00:00
ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin,
Fix source address selection on unbound sockets in the presence of multiple fibs. Use the mbuf's or the socket's fib instead of RT_ALL_FIBS. Fixes PR 187553. Also fixes netperf's UDP_STREAM test on a nondefault fib. sys/netinet/ip_output.c In ip_output, lookup the source address using the mbuf's fib instead of RT_ALL_FIBS. sys/netinet/in_pcb.c in in_pcbladdr, lookup the source address using the socket's fib, because we don't seem to have the mbuf fib. They should be the same, though. tests/sys/net/fibs_test.sh Clear the expected failure on udp_dontroute. PR: 187553 CR: https://reviews.freebsd.org/D772 MFC after: 3 weeks Sponsored by: Spectra Logic
2014-09-16 15:28:19 +00:00
inp->inp_socket->so_fibnum));
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
if (ia == NULL)
Revisions 264905 and 266860 added a "int fib" argument to ifa_ifwithnet and ifa_ifwithdstaddr. For the sake of backwards compatibility, the new arguments were added to new functions named ifa_ifwithnet_fib and ifa_ifwithdstaddr_fib, while the old functions became wrappers around the new ones that passed RT_ALL_FIBS for the fib argument. However, the backwards compatibility is not desired for FreeBSD 11, because there are numerous other incompatible changes to the ifnet(9) API. We therefore decided to remove it from head but leave it in place for stable/9 and stable/10. In addition, this commit adds the fib argument to ifa_ifwithbroadaddr for consistency's sake. sys/sys/param.h Increment __FreeBSD_version sys/net/if.c sys/net/if_var.h sys/net/route.c Add fibnum argument to ifa_ifwithbroadaddr, and remove the _fib versions of ifa_ifwithdstaddr, ifa_ifwithnet, and ifa_ifwithroute. sys/net/route.c sys/net/rtsock.c sys/netinet/in_pcb.c sys/netinet/ip_options.c sys/netinet/ip_output.c sys/netinet6/nd6.c Fixup calls of modified functions. share/man/man9/ifnet.9 Document changed API. CR: https://reviews.freebsd.org/D458 MFC after: Never Sponsored by: Spectra Logic
2014-09-11 20:21:03 +00:00
ia = ifatoia(ifa_ifwithnet((struct sockaddr *)sin, 0,
Fix source address selection on unbound sockets in the presence of multiple fibs. Use the mbuf's or the socket's fib instead of RT_ALL_FIBS. Fixes PR 187553. Also fixes netperf's UDP_STREAM test on a nondefault fib. sys/netinet/ip_output.c In ip_output, lookup the source address using the mbuf's fib instead of RT_ALL_FIBS. sys/netinet/in_pcb.c in in_pcbladdr, lookup the source address using the socket's fib, because we don't seem to have the mbuf fib. They should be the same, though. tests/sys/net/fibs_test.sh Clear the expected failure on udp_dontroute. PR: 187553 CR: https://reviews.freebsd.org/D772 MFC after: 3 weeks Sponsored by: Spectra Logic
2014-09-16 15:28:19 +00:00
inp->inp_socket->so_fibnum));
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
if (ia == NULL) {
error = ENETUNREACH;
goto done;
}
Add hierarchical jails. A jail may further virtualize its environment by creating a child jail, which is visible to that jail and to any parent jails. Child jails may be restricted more than their parents, but never less. Jail names reflect this hierarchy, being MIB-style dot-separated strings. Every thread now points to a jail, the default being prison0, which contains information about the physical system. Prison0's root directory is the same as rootvnode; its hostname is the same as the global hostname, and its securelevel replaces the global securelevel. Note that the variable "securelevel" has actually gone away, which should not cause any problems for code that properly uses securelevel_gt() and securelevel_ge(). Some jail-related permissions that were kept in global variables and set via sysctls are now per-jail settings. The sysctls still exist for backward compatibility, used only by the now-deprecated jail(2) system call. Approved by: bz (mentor)
2009-05-27 14:11:23 +00:00
if (cred == NULL || !prison_flag(cred, PR_IP4)) {
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
Modify most routines returning 'struct ifaddr *' to return references rather than pointers, requiring callers to properly dispose of those references. The following routines now return references: ifaddr_byindex ifa_ifwithaddr ifa_ifwithbroadaddr ifa_ifwithdstaddr ifa_ifwithnet ifaof_ifpforaddr ifa_ifwithroute ifa_ifwithroute_fib rt_getifa rt_getifa_fib IFP_TO_IA ip_rtaddr in6_ifawithifp in6ifa_ifpforlinklocal in6ifa_ifpwithaddr in6_ifadd carp_iamatch6 ip6_getdstifaddr Remove unused macro which didn't have required referencing: IFP_TO_IA6 This closes many small races in which changes to interface or address lists while an ifaddr was in use could lead to use of freed memory (etc). In a few cases, add missing if_addr_list locking required to safely acquire references. Because of a lack of deep copying support, we accept a race in which an in6_ifaddr pointed to by mbuf tags and extracted with ip6_getdstifaddr() doesn't hold a reference while in transmit. Once we have mbuf tag deep copy support, this can be fixed. Reviewed by: bz Obtained from: Apple, Inc. (portions) MFC after: 6 weeks (portions)
2009-06-23 20:19:09 +00:00
ifa_free(&ia->ia_ifa);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
goto done;
}
ifp = ia->ia_ifp;
Modify most routines returning 'struct ifaddr *' to return references rather than pointers, requiring callers to properly dispose of those references. The following routines now return references: ifaddr_byindex ifa_ifwithaddr ifa_ifwithbroadaddr ifa_ifwithdstaddr ifa_ifwithnet ifaof_ifpforaddr ifa_ifwithroute ifa_ifwithroute_fib rt_getifa rt_getifa_fib IFP_TO_IA ip_rtaddr in6_ifawithifp in6ifa_ifpforlinklocal in6ifa_ifpwithaddr in6_ifadd carp_iamatch6 ip6_getdstifaddr Remove unused macro which didn't have required referencing: IFP_TO_IA6 This closes many small races in which changes to interface or address lists while an ifaddr was in use could lead to use of freed memory (etc). In a few cases, add missing if_addr_list locking required to safely acquire references. Because of a lack of deep copying support, we accept a race in which an in6_ifaddr pointed to by mbuf tags and extracted with ip6_getdstifaddr() doesn't hold a reference while in transmit. Once we have mbuf tag deep copy support, this can be fixed. Reviewed by: bz Obtained from: Apple, Inc. (portions) MFC after: 6 weeks (portions)
2009-06-23 20:19:09 +00:00
ifa_free(&ia->ia_ifa);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
ia = NULL;
Convert all users of IF_ADDR_LOCK to use new locking macros that specify either a read lock or write lock. Reviewed by: bz MFC after: 2 weeks
2012-01-05 19:00:36 +00:00
IF_ADDR_RLOCK(ifp);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
sa = ifa->ifa_addr;
if (sa->sa_family != AF_INET)
continue;
sin = (struct sockaddr_in *)sa;
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
ia = (struct in_ifaddr *)ifa;
break;
}
}
if (ia != NULL) {
laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
Convert all users of IF_ADDR_LOCK to use new locking macros that specify either a read lock or write lock. Reviewed by: bz MFC after: 2 weeks
2012-01-05 19:00:36 +00:00
IF_ADDR_RUNLOCK(ifp);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
goto done;
}
Convert all users of IF_ADDR_LOCK to use new locking macros that specify either a read lock or write lock. Reviewed by: bz MFC after: 2 weeks
2012-01-05 19:00:36 +00:00
IF_ADDR_RUNLOCK(ifp);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
/* 3. As a last resort return the 'default' jail address. */
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
error = prison_get_ip4(cred, laddr);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
goto done;
}
/*
* If the outgoing interface on the route found is not
* a loopback interface, use the address from that interface.
* In case of jails do those three steps:
* 1. check if the interface address belongs to the jail. If so use it.
* 2. check if we have any address on the outgoing interface
* belonging to this jail. If so use it.
* 3. as a last resort return the 'default' jail address.
*/
if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
Modify most routines returning 'struct ifaddr *' to return references rather than pointers, requiring callers to properly dispose of those references. The following routines now return references: ifaddr_byindex ifa_ifwithaddr ifa_ifwithbroadaddr ifa_ifwithdstaddr ifa_ifwithnet ifaof_ifpforaddr ifa_ifwithroute ifa_ifwithroute_fib rt_getifa rt_getifa_fib IFP_TO_IA ip_rtaddr in6_ifawithifp in6ifa_ifpforlinklocal in6ifa_ifpwithaddr in6_ifadd carp_iamatch6 ip6_getdstifaddr Remove unused macro which didn't have required referencing: IFP_TO_IA6 This closes many small races in which changes to interface or address lists while an ifaddr was in use could lead to use of freed memory (etc). In a few cases, add missing if_addr_list locking required to safely acquire references. Because of a lack of deep copying support, we accept a race in which an in6_ifaddr pointed to by mbuf tags and extracted with ip6_getdstifaddr() doesn't hold a reference while in transmit. Once we have mbuf tag deep copy support, this can be fixed. Reviewed by: bz Obtained from: Apple, Inc. (portions) MFC after: 6 weeks (portions)
2009-06-23 20:19:09 +00:00
struct in_ifaddr *ia;
Lock interface address lists in in_pcbladdr() when searching for a source address for a connection and there's no route or now interface for the route. MFC after: 2 weeks
2009-04-19 22:25:09 +00:00
struct ifnet *ifp;
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
/* If not jailed, use the default returned. */
Add hierarchical jails. A jail may further virtualize its environment by creating a child jail, which is visible to that jail and to any parent jails. Child jails may be restricted more than their parents, but never less. Jail names reflect this hierarchy, being MIB-style dot-separated strings. Every thread now points to a jail, the default being prison0, which contains information about the physical system. Prison0's root directory is the same as rootvnode; its hostname is the same as the global hostname, and its securelevel replaces the global securelevel. Note that the variable "securelevel" has actually gone away, which should not cause any problems for code that properly uses securelevel_gt() and securelevel_ge(). Some jail-related permissions that were kept in global variables and set via sysctls are now per-jail settings. The sysctls still exist for backward compatibility, used only by the now-deprecated jail(2) system call. Approved by: bz (mentor)
2009-05-27 14:11:23 +00:00
if (cred == NULL || !prison_flag(cred, PR_IP4)) {
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
goto done;
}
/* Jailed. */
/* 1. Check if the iface address belongs to the jail. */
sin = (struct sockaddr_in *)sro.ro_rt->rt_ifa->ifa_addr;
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
ia = (struct in_ifaddr *)sro.ro_rt->rt_ifa;
laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
goto done;
}
/*
* 2. Check if we have any address on the outgoing interface
* belonging to this jail.
*/
Modify most routines returning 'struct ifaddr *' to return references rather than pointers, requiring callers to properly dispose of those references. The following routines now return references: ifaddr_byindex ifa_ifwithaddr ifa_ifwithbroadaddr ifa_ifwithdstaddr ifa_ifwithnet ifaof_ifpforaddr ifa_ifwithroute ifa_ifwithroute_fib rt_getifa rt_getifa_fib IFP_TO_IA ip_rtaddr in6_ifawithifp in6ifa_ifpforlinklocal in6ifa_ifpwithaddr in6_ifadd carp_iamatch6 ip6_getdstifaddr Remove unused macro which didn't have required referencing: IFP_TO_IA6 This closes many small races in which changes to interface or address lists while an ifaddr was in use could lead to use of freed memory (etc). In a few cases, add missing if_addr_list locking required to safely acquire references. Because of a lack of deep copying support, we accept a race in which an in6_ifaddr pointed to by mbuf tags and extracted with ip6_getdstifaddr() doesn't hold a reference while in transmit. Once we have mbuf tag deep copy support, this can be fixed. Reviewed by: bz Obtained from: Apple, Inc. (portions) MFC after: 6 weeks (portions)
2009-06-23 20:19:09 +00:00
ia = NULL;
Lock interface address lists in in_pcbladdr() when searching for a source address for a connection and there's no route or now interface for the route. MFC after: 2 weeks
2009-04-19 22:25:09 +00:00
ifp = sro.ro_rt->rt_ifp;
Convert all users of IF_ADDR_LOCK to use new locking macros that specify either a read lock or write lock. Reviewed by: bz MFC after: 2 weeks
2012-01-05 19:00:36 +00:00
IF_ADDR_RLOCK(ifp);
Lock interface address lists in in_pcbladdr() when searching for a source address for a connection and there's no route or now interface for the route. MFC after: 2 weeks
2009-04-19 22:25:09 +00:00
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
sa = ifa->ifa_addr;
if (sa->sa_family != AF_INET)
continue;
sin = (struct sockaddr_in *)sa;
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
if (prison_check_ip4(cred, &sin->sin_addr) == 0) {
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
ia = (struct in_ifaddr *)ifa;
break;
}
}
if (ia != NULL) {
laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
Convert all users of IF_ADDR_LOCK to use new locking macros that specify either a read lock or write lock. Reviewed by: bz MFC after: 2 weeks
2012-01-05 19:00:36 +00:00
IF_ADDR_RUNLOCK(ifp);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
goto done;
}
Convert all users of IF_ADDR_LOCK to use new locking macros that specify either a read lock or write lock. Reviewed by: bz MFC after: 2 weeks
2012-01-05 19:00:36 +00:00
IF_ADDR_RUNLOCK(ifp);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
/* 3. As a last resort return the 'default' jail address. */
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
error = prison_get_ip4(cred, laddr);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
goto done;
}
/*
* The outgoing interface is marked with 'loopback net', so a route
* to ourselves is here.
* Try to find the interface of the destination address and then
* take the address from there. That interface is not necessarily
* a loopback interface.
* In case of jails, check that it is an address of the jail
* and if we cannot find, fall back to the 'default' jail address.
*/
if ((sro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
struct sockaddr_in sain;
Modify most routines returning 'struct ifaddr *' to return references rather than pointers, requiring callers to properly dispose of those references. The following routines now return references: ifaddr_byindex ifa_ifwithaddr ifa_ifwithbroadaddr ifa_ifwithdstaddr ifa_ifwithnet ifaof_ifpforaddr ifa_ifwithroute ifa_ifwithroute_fib rt_getifa rt_getifa_fib IFP_TO_IA ip_rtaddr in6_ifawithifp in6ifa_ifpforlinklocal in6ifa_ifpwithaddr in6_ifadd carp_iamatch6 ip6_getdstifaddr Remove unused macro which didn't have required referencing: IFP_TO_IA6 This closes many small races in which changes to interface or address lists while an ifaddr was in use could lead to use of freed memory (etc). In a few cases, add missing if_addr_list locking required to safely acquire references. Because of a lack of deep copying support, we accept a race in which an in6_ifaddr pointed to by mbuf tags and extracted with ip6_getdstifaddr() doesn't hold a reference while in transmit. Once we have mbuf tag deep copy support, this can be fixed. Reviewed by: bz Obtained from: Apple, Inc. (portions) MFC after: 6 weeks (portions)
2009-06-23 20:19:09 +00:00
struct in_ifaddr *ia;
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
bzero(&sain, sizeof(struct sockaddr_in));
sain.sin_family = AF_INET;
sain.sin_len = sizeof(struct sockaddr_in);
sain.sin_addr.s_addr = faddr->s_addr;
Fix source address selection on unbound sockets in the presence of multiple fibs. Use the mbuf's or the socket's fib instead of RT_ALL_FIBS. Fixes PR 187553. Also fixes netperf's UDP_STREAM test on a nondefault fib. sys/netinet/ip_output.c In ip_output, lookup the source address using the mbuf's fib instead of RT_ALL_FIBS. sys/netinet/in_pcb.c in in_pcbladdr, lookup the source address using the socket's fib, because we don't seem to have the mbuf fib. They should be the same, though. tests/sys/net/fibs_test.sh Clear the expected failure on udp_dontroute. PR: 187553 CR: https://reviews.freebsd.org/D772 MFC after: 3 weeks Sponsored by: Spectra Logic
2014-09-16 15:28:19 +00:00
ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sain),
inp->inp_socket->so_fibnum));
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
if (ia == NULL)
Revisions 264905 and 266860 added a "int fib" argument to ifa_ifwithnet and ifa_ifwithdstaddr. For the sake of backwards compatibility, the new arguments were added to new functions named ifa_ifwithnet_fib and ifa_ifwithdstaddr_fib, while the old functions became wrappers around the new ones that passed RT_ALL_FIBS for the fib argument. However, the backwards compatibility is not desired for FreeBSD 11, because there are numerous other incompatible changes to the ifnet(9) API. We therefore decided to remove it from head but leave it in place for stable/9 and stable/10. In addition, this commit adds the fib argument to ifa_ifwithbroadaddr for consistency's sake. sys/sys/param.h Increment __FreeBSD_version sys/net/if.c sys/net/if_var.h sys/net/route.c Add fibnum argument to ifa_ifwithbroadaddr, and remove the _fib versions of ifa_ifwithdstaddr, ifa_ifwithnet, and ifa_ifwithroute. sys/net/route.c sys/net/rtsock.c sys/netinet/in_pcb.c sys/netinet/ip_options.c sys/netinet/ip_output.c sys/netinet6/nd6.c Fixup calls of modified functions. share/man/man9/ifnet.9 Document changed API. CR: https://reviews.freebsd.org/D458 MFC after: Never Sponsored by: Spectra Logic
2014-09-11 20:21:03 +00:00
ia = ifatoia(ifa_ifwithnet(sintosa(&sain), 0,
Fix source address selection on unbound sockets in the presence of multiple fibs. Use the mbuf's or the socket's fib instead of RT_ALL_FIBS. Fixes PR 187553. Also fixes netperf's UDP_STREAM test on a nondefault fib. sys/netinet/ip_output.c In ip_output, lookup the source address using the mbuf's fib instead of RT_ALL_FIBS. sys/netinet/in_pcb.c in in_pcbladdr, lookup the source address using the socket's fib, because we don't seem to have the mbuf fib. They should be the same, though. tests/sys/net/fibs_test.sh Clear the expected failure on udp_dontroute. PR: 187553 CR: https://reviews.freebsd.org/D772 MFC after: 3 weeks Sponsored by: Spectra Logic
2014-09-16 15:28:19 +00:00
inp->inp_socket->so_fibnum));
Previously local end of point-to-point interface is not reachable within the system that owns the interface. Packets destined to the local end point leak to the wire towards the default gateway if one exists. This behavior is changed as part of the L2/L3 rewrite efforts. The local end point is now reachable within the system. The inpcb code needs to consider this fact during the address selection process. Reviewed by: bz MFC after: immediately
2009-09-14 22:19:47 +00:00
if (ia == NULL)
ia = ifatoia(ifa_ifwithaddr(sintosa(&sain)));
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
Add hierarchical jails. A jail may further virtualize its environment by creating a child jail, which is visible to that jail and to any parent jails. Child jails may be restricted more than their parents, but never less. Jail names reflect this hierarchy, being MIB-style dot-separated strings. Every thread now points to a jail, the default being prison0, which contains information about the physical system. Prison0's root directory is the same as rootvnode; its hostname is the same as the global hostname, and its securelevel replaces the global securelevel. Note that the variable "securelevel" has actually gone away, which should not cause any problems for code that properly uses securelevel_gt() and securelevel_ge(). Some jail-related permissions that were kept in global variables and set via sysctls are now per-jail settings. The sysctls still exist for backward compatibility, used only by the now-deprecated jail(2) system call. Approved by: bz (mentor)
2009-05-27 14:11:23 +00:00
if (cred == NULL || !prison_flag(cred, PR_IP4)) {
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
if (ia == NULL) {
error = ENETUNREACH;
goto done;
}
laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
Modify most routines returning 'struct ifaddr *' to return references rather than pointers, requiring callers to properly dispose of those references. The following routines now return references: ifaddr_byindex ifa_ifwithaddr ifa_ifwithbroadaddr ifa_ifwithdstaddr ifa_ifwithnet ifaof_ifpforaddr ifa_ifwithroute ifa_ifwithroute_fib rt_getifa rt_getifa_fib IFP_TO_IA ip_rtaddr in6_ifawithifp in6ifa_ifpforlinklocal in6ifa_ifpwithaddr in6_ifadd carp_iamatch6 ip6_getdstifaddr Remove unused macro which didn't have required referencing: IFP_TO_IA6 This closes many small races in which changes to interface or address lists while an ifaddr was in use could lead to use of freed memory (etc). In a few cases, add missing if_addr_list locking required to safely acquire references. Because of a lack of deep copying support, we accept a race in which an in6_ifaddr pointed to by mbuf tags and extracted with ip6_getdstifaddr() doesn't hold a reference while in transmit. Once we have mbuf tag deep copy support, this can be fixed. Reviewed by: bz Obtained from: Apple, Inc. (portions) MFC after: 6 weeks (portions)
2009-06-23 20:19:09 +00:00
ifa_free(&ia->ia_ifa);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
goto done;
}
/* Jailed. */
if (ia != NULL) {
struct ifnet *ifp;
ifp = ia->ia_ifp;
Modify most routines returning 'struct ifaddr *' to return references rather than pointers, requiring callers to properly dispose of those references. The following routines now return references: ifaddr_byindex ifa_ifwithaddr ifa_ifwithbroadaddr ifa_ifwithdstaddr ifa_ifwithnet ifaof_ifpforaddr ifa_ifwithroute ifa_ifwithroute_fib rt_getifa rt_getifa_fib IFP_TO_IA ip_rtaddr in6_ifawithifp in6ifa_ifpforlinklocal in6ifa_ifpwithaddr in6_ifadd carp_iamatch6 ip6_getdstifaddr Remove unused macro which didn't have required referencing: IFP_TO_IA6 This closes many small races in which changes to interface or address lists while an ifaddr was in use could lead to use of freed memory (etc). In a few cases, add missing if_addr_list locking required to safely acquire references. Because of a lack of deep copying support, we accept a race in which an in6_ifaddr pointed to by mbuf tags and extracted with ip6_getdstifaddr() doesn't hold a reference while in transmit. Once we have mbuf tag deep copy support, this can be fixed. Reviewed by: bz Obtained from: Apple, Inc. (portions) MFC after: 6 weeks (portions)
2009-06-23 20:19:09 +00:00
ifa_free(&ia->ia_ifa);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
ia = NULL;
Convert all users of IF_ADDR_LOCK to use new locking macros that specify either a read lock or write lock. Reviewed by: bz MFC after: 2 weeks
2012-01-05 19:00:36 +00:00
IF_ADDR_RLOCK(ifp);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
sa = ifa->ifa_addr;
if (sa->sa_family != AF_INET)
continue;
sin = (struct sockaddr_in *)sa;
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
if (prison_check_ip4(cred,
&sin->sin_addr) == 0) {
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
ia = (struct in_ifaddr *)ifa;
break;
}
}
if (ia != NULL) {
laddr->s_addr = ia->ia_addr.sin_addr.s_addr;
Convert all users of IF_ADDR_LOCK to use new locking macros that specify either a read lock or write lock. Reviewed by: bz MFC after: 2 weeks
2012-01-05 19:00:36 +00:00
IF_ADDR_RUNLOCK(ifp);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
goto done;
}
Convert all users of IF_ADDR_LOCK to use new locking macros that specify either a read lock or write lock. Reviewed by: bz MFC after: 2 weeks
2012-01-05 19:00:36 +00:00
IF_ADDR_RUNLOCK(ifp);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
}
/* 3. As a last resort return the 'default' jail address. */
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
error = prison_get_ip4(cred, laddr);
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
goto done;
}
done:
if (sro.ro_rt != NULL)
RTFREE(sro.ro_rt);
return (error);
}
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
/*
* Set up for a connect from a socket to the specified address.
* On entry, *laddrp and *lportp should contain the current local
* address and port for the PCB; these are updated to the values
* that should be placed in inp_laddr and inp_lport to complete
* the connect.
*
* On success, *faddrp and *fportp will be set to the remote address
* and port. These are not updated in the error case.
*
* If the operation fails because the connection already exists,
* *oinpp will be set to the PCB of that connection so that the
* caller can decide to override it. In all other cases, *oinpp
* is set to NULL.
*/
T/TCP changes to generic IP code. This is all ifdefed TTCP so should have no effect on most users for now. (Eventually, once this code is fully tested, the ifdefs will go away.)
1995-02-08 20:22:09 +00:00
int
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
in_addr_t *laddrp, u_short *lportp, in_addr_t *faddrp, u_short *fportp,
struct inpcb **oinpp, struct ucred *cred)
T/TCP changes to generic IP code. This is all ifdefed TTCP so should have no effect on most users for now. (Eventually, once this code is fully tested, the ifdefs will go away.)
1995-02-08 20:22:09 +00:00
{
Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. Both are used to protect access to IP addresses lists and they can be acquired for reading several times per packet. To reduce lock contention it is better to use rmlock here. Reviewed by: gnn (previous version) Obtained from: Yandex LLC Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D3149
2015-07-29 08:12:05 +00:00
struct rm_priotracker in_ifa_tracker;
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
struct sockaddr_in *sin = (struct sockaddr_in *)nam;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct in_ifaddr *ia;
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
struct inpcb *oinp;
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
struct in_addr laddr, faddr;
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
u_short lport, fport;
int error;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
/*
* Because a global state change doesn't actually occur here, a read
* lock is sufficient.
*/
Assert the locks of inpcbinfo's and inpcb's passed into in_pcbconnect() and in_pcbconnect_setup(), since these functions frob the port and address state of inpcbs.
2004-08-11 04:35:20 +00:00
INP_LOCK_ASSERT(inp);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_LOCK_ASSERT(inp->inp_pcbinfo);
Assert the locks of inpcbinfo's and inpcb's passed into in_pcbconnect() and in_pcbconnect_setup(), since these functions frob the port and address state of inpcbs.
2004-08-11 04:35:20 +00:00
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
if (oinpp != NULL)
*oinpp = NULL;
Fix all areas of the system (or at least all those in LINT) to avoid storing socket addresses in mbufs. (Socket buffers are the one exception.) A number of kernel APIs needed to get fixed in order to make this happen. Also, fix three protocol families which kept PCBs in mbufs to not malloc them instead. Delete some old compatibility cruft while we're at it, and add some new routines in the in_cksum family.
1997-08-16 19:16:27 +00:00
if (nam->sa_len != sizeof (*sin))
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (EINVAL);
if (sin->sin_family != AF_INET)
return (EAFNOSUPPORT);
if (sin->sin_port == 0)
return (EADDRNOTAVAIL);
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
laddr.s_addr = *laddrp;
lport = *lportp;
faddr = sin->sin_addr;
fport = sin->sin_port;
Implement IPv4 source address selection for unbound sockets. For the jail case we are already looping over the interface addresses before falling back to the only IP address of a jail in case of no match. This is in preparation for the upcoming multi-IPv4/v6/no-IP jail patch this change was developed with initially. This also changes the semantics of selecting the IP for processes within a jail as it now uses the same logic as outside the jail (with additional checks) but no longer is on a mutually exclusive code path. Benchmarks had shown no difference at 95.0% confidence for neither the plain nor the jail case (even with the additional overhead). See: http://lists.freebsd.org/pipermail/freebsd-net/2008-September/019531.html Inpsired by a patch from: Yahoo! (partially) Tested by: latest multi-IP jail patch users (implictly) Discussed with: rwatson (general things around this) Reviewed by: mostly silence (feedback from bms) Help with benchmarking from: kris MFC after: 2 months
2008-10-03 12:21:21 +00:00
Commit step 1 of the vimage project, (network stack) virtualization work done by Marko Zec (zec@). This is the first in a series of commits over the course of the next few weeks. Mark all uses of global variables to be virtualized with a V_ prefix. Use macros to map them back to their global names for now, so this is a NOP change only. We hope to have caught at least 85-90% of what is needed so we do not invalidate a lot of outstanding patches again. Obtained from: //depot/projects/vimage-commit2/... Reviewed by: brooks, des, ed, mav, julian, jamie, kris, rwatson, zec, ... (various people I forgot, different versions) md5 (with a bit of help) Sponsored by: NLnet Foundation, The FreeBSD Foundation X-MFC after: never V_Commit_Message_Reviewed_By: more people than the patch
2008-08-17 23:27:27 +00:00
if (!TAILQ_EMPTY(&V_in_ifaddrhead)) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* If the destination address is INADDR_ANY,
* use the primary local address.
* If the supplied address is INADDR_BROADCAST,
* and the primary interface supports broadcast,
* choose the broadcast address for that interface.
*/
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
if (faddr.s_addr == INADDR_ANY) {
Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. Both are used to protect access to IP addresses lists and they can be acquired for reading several times per packet. To reduce lock contention it is better to use rmlock here. Reviewed by: gnn (previous version) Obtained from: Yandex LLC Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D3149
2015-07-29 08:12:05 +00:00
IN_IFADDR_RLOCK(&in_ifa_tracker);
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
faddr =
IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr;
Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. Both are used to protect access to IP addresses lists and they can be acquired for reading several times per packet. To reduce lock contention it is better to use rmlock here. Reviewed by: gnn (previous version) Obtained from: Yandex LLC Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D3149
2015-07-29 08:12:05 +00:00
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
if (cred != NULL &&
(error = prison_get_ip4(cred, &faddr)) != 0)
return (error);
Add a new global rwlock, in_ifaddr_lock, which will synchronize use of the in_ifaddrhead and INADDR_HASH address lists. Previously, these lists were used unsynchronized as they were effectively never changed in steady state, but we've seen increasing reports of writer-writer races on very busy VPN servers as core count has gone up (and similar configurations where address lists change frequently and concurrently). For the time being, use rwlocks rather than rmlocks in order to take advantage of their better lock debugging support. As a result, we don't enable ip_input()'s read-locking of INADDR_HASH until an rmlock conversion is complete and a performance analysis has been done. This means that one class of reader-writer races still exists. MFC after: 6 weeks Reviewed by: bz
2009-06-25 11:52:33 +00:00
} else if (faddr.s_addr == (u_long)INADDR_BROADCAST) {
Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. Both are used to protect access to IP addresses lists and they can be acquired for reading several times per packet. To reduce lock contention it is better to use rmlock here. Reviewed by: gnn (previous version) Obtained from: Yandex LLC Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D3149
2015-07-29 08:12:05 +00:00
IN_IFADDR_RLOCK(&in_ifa_tracker);
Add a new global rwlock, in_ifaddr_lock, which will synchronize use of the in_ifaddrhead and INADDR_HASH address lists. Previously, these lists were used unsynchronized as they were effectively never changed in steady state, but we've seen increasing reports of writer-writer races on very busy VPN servers as core count has gone up (and similar configurations where address lists change frequently and concurrently). For the time being, use rwlocks rather than rmlocks in order to take advantage of their better lock debugging support. As a result, we don't enable ip_input()'s read-locking of INADDR_HASH until an rmlock conversion is complete and a performance analysis has been done. This means that one class of reader-writer races still exists. MFC after: 6 weeks Reviewed by: bz
2009-06-25 11:52:33 +00:00
if (TAILQ_FIRST(&V_in_ifaddrhead)->ia_ifp->if_flags &
IFF_BROADCAST)
faddr = satosin(&TAILQ_FIRST(
&V_in_ifaddrhead)->ia_broadaddr)->sin_addr;
Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. Both are used to protect access to IP addresses lists and they can be acquired for reading several times per packet. To reduce lock contention it is better to use rmlock here. Reviewed by: gnn (previous version) Obtained from: Yandex LLC Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D3149
2015-07-29 08:12:05 +00:00
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
Add a new global rwlock, in_ifaddr_lock, which will synchronize use of the in_ifaddrhead and INADDR_HASH address lists. Previously, these lists were used unsynchronized as they were effectively never changed in steady state, but we've seen increasing reports of writer-writer races on very busy VPN servers as core count has gone up (and similar configurations where address lists change frequently and concurrently). For the time being, use rwlocks rather than rmlocks in order to take advantage of their better lock debugging support. As a result, we don't enable ip_input()'s read-locking of INADDR_HASH until an rmlock conversion is complete and a performance analysis has been done. This means that one class of reader-writer races still exists. MFC after: 6 weeks Reviewed by: bz
2009-06-25 11:52:33 +00:00
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
if (laddr.s_addr == INADDR_ANY) {
Make sure to always do source address selection on an unbound socket, regardless of any multicast options. If an address is specified via a multicast option, then let it override normal the source address selection. This fixes a bug where source address selection was not being performed when multicast options were present but without an interface being specified. Reviewed by: bz MFC after: 1 day
2011-01-08 22:33:46 +00:00
error = in_pcbladdr(inp, &faddr, &laddr, cred);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* If the destination address is multicast and an outgoing
Make sure to always do source address selection on an unbound socket, regardless of any multicast options. If an address is specified via a multicast option, then let it override normal the source address selection. This fixes a bug where source address selection was not being performed when multicast options were present but without an interface being specified. Reviewed by: bz MFC after: 1 day
2011-01-08 22:33:46 +00:00
* interface has been set as a multicast option, prefer the
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
* address of that interface as our source address.
*/
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
inp->inp_moptions != NULL) {
struct ip_moptions *imo;
struct ifnet *ifp;
imo = inp->inp_moptions;
if (imo->imo_multicast_ifp != NULL) {
ifp = imo->imo_multicast_ifp;
Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. Both are used to protect access to IP addresses lists and they can be acquired for reading several times per packet. To reduce lock contention it is better to use rmlock here. Reviewed by: gnn (previous version) Obtained from: Yandex LLC Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D3149
2015-07-29 08:12:05 +00:00
IN_IFADDR_RLOCK(&in_ifa_tracker);
Prison check addresses set with multicast interface options. Reviewed by: bz MFC after: 1 week
2011-01-26 17:31:03 +00:00
TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
if ((ia->ia_ifp == ifp) &&
(cred == NULL ||
prison_check_ip4(cred,
&ia->ia_addr.sin_addr) == 0))
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
break;
Prison check addresses set with multicast interface options. Reviewed by: bz MFC after: 1 week
2011-01-26 17:31:03 +00:00
}
if (ia == NULL)
Make sure to always do source address selection on an unbound socket, regardless of any multicast options. If an address is specified via a multicast option, then let it override normal the source address selection. This fixes a bug where source address selection was not being performed when multicast options were present but without an interface being specified. Reviewed by: bz MFC after: 1 day
2011-01-08 22:33:46 +00:00
error = EADDRNOTAVAIL;
Prison check addresses set with multicast interface options. Reviewed by: bz MFC after: 1 week
2011-01-26 17:31:03 +00:00
else {
Make sure to always do source address selection on an unbound socket, regardless of any multicast options. If an address is specified via a multicast option, then let it override normal the source address selection. This fixes a bug where source address selection was not being performed when multicast options were present but without an interface being specified. Reviewed by: bz MFC after: 1 day
2011-01-08 22:33:46 +00:00
laddr = ia->ia_addr.sin_addr;
error = 0;
Add a new global rwlock, in_ifaddr_lock, which will synchronize use of the in_ifaddrhead and INADDR_HASH address lists. Previously, these lists were used unsynchronized as they were effectively never changed in steady state, but we've seen increasing reports of writer-writer races on very busy VPN servers as core count has gone up (and similar configurations where address lists change frequently and concurrently). For the time being, use rwlocks rather than rmlocks in order to take advantage of their better lock debugging support. As a result, we don't enable ip_input()'s read-locking of INADDR_HASH until an rmlock conversion is complete and a performance analysis has been done. This means that one class of reader-writer races still exists. MFC after: 6 weeks Reviewed by: bz
2009-06-25 11:52:33 +00:00
}
Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. Both are used to protect access to IP addresses lists and they can be acquired for reading several times per packet. To reduce lock contention it is better to use rmlock here. Reviewed by: gnn (previous version) Obtained from: Yandex LLC Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D3149
2015-07-29 08:12:05 +00:00
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
}
Make sure to always do source address selection on an unbound socket, regardless of any multicast options. If an address is specified via a multicast option, then let it override normal the source address selection. This fixes a bug where source address selection was not being performed when multicast options were present but without an interface being specified. Reviewed by: bz MFC after: 1 day
2011-01-08 22:33:46 +00:00
if (error)
return (error);
T/TCP changes to generic IP code. This is all ifdefed TTCP so should have no effect on most users for now. (Eventually, once this code is fully tested, the ifdefs will go away.)
1995-02-08 20:22:09 +00:00
}
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
oinp = in_pcblookup_hash_locked(inp->inp_pcbinfo, faddr, fport,
laddr, lport, 0, NULL);
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
if (oinp != NULL) {
if (oinpp != NULL)
*oinpp = oinp;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (EADDRINUSE);
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
}
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
if (lport == 0) {
Reduce 'td' argument to 'cred' (struct ucred) argument in those functions: - in_pcbbind(), - in_pcbbind_setup(), - in_pcbconnect(), - in_pcbconnect_setup(), - in6_pcbbind(), - in6_pcbconnect(), - in6_pcbsetport(). "It should simplify/clarify things a great deal." --rwatson Requested by: rwatson Reviewed by: rwatson, ume
2004-03-27 21:05:46 +00:00
error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport,
cred);
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
if (error)
return (error);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
Replace in_pcbladdr() with a more generic inner subroutine for in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
2002-10-21 13:55:50 +00:00
*laddrp = laddr.s_addr;
*lportp = lport;
*faddrp = faddr.s_addr;
*fportp = fport;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (0);
}
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
void
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcbdisconnect(struct inpcb *inp)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
Assert pcbinfo lock in in_pcbdisconnect() and in_pcbdetach(), as the global pcb lists are modified. MFC after: 7 days
2005-06-01 11:39:42 +00:00
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK_ASSERT(inp);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
inp->inp_faddr.s_addr = INADDR_ANY;
inp->inp_fport = 0;
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
in_pcbrehash(inp);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif /* INET */
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Break out in_pcbdetach() into two functions: - in_pcbdetach(), which removes the link between an inpcb and its socket. - in_pcbfree(), which frees a detached pcb. Unlike the previous in_pcbdetach(), neither of these functions will attempt to conditionally free the socket, as they are responsible only for managing in_pcb memory. Mirror these changes into in6_pcbdetach() by breaking it into in6_pcbdetach() and in6_pcbfree(). While here, eliminate undesired checks for NULL inpcb pointers in sockets, as we will now have as an invariant that sockets will always have valid so_pcb pointers. MFC after: 3 months
2006-04-01 16:04:42 +00:00
/*
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
* in_pcbdetach() is responsibe for disassociating a socket from an inpcb.
Expand comments relating various detach/free/drop inpcb routines. MFC after: 3 days
2008-09-29 13:50:17 +00:00
* For most protocols, this will be invoked immediately prior to calling
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
* in_pcbfree(). However, with TCP the inpcb may significantly outlive the
* socket, in which case in_pcbfree() is deferred.
Break out in_pcbdetach() into two functions: - in_pcbdetach(), which removes the link between an inpcb and its socket. - in_pcbfree(), which frees a detached pcb. Unlike the previous in_pcbdetach(), neither of these functions will attempt to conditionally free the socket, as they are responsible only for managing in_pcb memory. Mirror these changes into in6_pcbdetach() by breaking it into in6_pcbdetach() and in6_pcbfree(). While here, eliminate undesired checks for NULL inpcb pointers in sockets, as we will now have as an invariant that sockets will always have valid so_pcb pointers. MFC after: 3 months
2006-04-01 16:04:42 +00:00
*/
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
void
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcbdetach(struct inpcb *inp)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
Break out in_pcbdetach() into two functions: - in_pcbdetach(), which removes the link between an inpcb and its socket. - in_pcbfree(), which frees a detached pcb. Unlike the previous in_pcbdetach(), neither of these functions will attempt to conditionally free the socket, as they are responsible only for managing in_pcb memory. Mirror these changes into in6_pcbdetach() by breaking it into in6_pcbdetach() and in6_pcbfree(). While here, eliminate undesired checks for NULL inpcb pointers in sockets, as we will now have as an invariant that sockets will always have valid so_pcb pointers. MFC after: 3 months
2006-04-01 16:04:42 +00:00
Unify the v4 and v6 versions of pcbdetach and pcbfree as good as possible so that they are easily diffable. No functional changes. Reviewed by: rwatson MFC after: 6 weeks
2008-11-26 12:54:31 +00:00
KASSERT(inp->inp_socket != NULL, ("%s: inp_socket == NULL", __func__));
Expand comments relating various detach/free/drop inpcb routines. MFC after: 3 days
2008-09-29 13:50:17 +00:00
Implement kernel support for hardware rate limited sockets. - Add RATELIMIT kernel configuration keyword which must be set to enable the new functionality. - Add support for hardware driven, Receive Side Scaling, RSS aware, rate limited sendqueues and expose the functionality through the already established SO_MAX_PACING_RATE setsockopt(). The API support rates in the range from 1 to 4Gbytes/s which are suitable for regular TCP and UDP streams. The setsockopt(2) manual page has been updated. - Add rate limit function callback API to "struct ifnet" which supports the following operations: if_snd_tag_alloc(), if_snd_tag_modify(), if_snd_tag_query() and if_snd_tag_free(). - Add support to ifconfig to view, set and clear the IFCAP_TXRTLMT flag, which tells if a network driver supports rate limiting or not. - This patch also adds support for rate limiting through VLAN and LAGG intermediate network devices. - How rate limiting works: 1) The userspace application calls setsockopt() after accepting or making a new connection to set the rate which is then stored in the socket structure in the kernel. Later on when packets are transmitted a check is made in the transmit path for rate changes. A rate change implies a non-blocking ifp->if_snd_tag_alloc() call will be made to the destination network interface, which then sets up a custom sendqueue with the given rate limitation parameter. A "struct m_snd_tag" pointer is returned which serves as a "snd_tag" hint in the m_pkthdr for the subsequently transmitted mbufs. 2) When the network driver sees the "m->m_pkthdr.snd_tag" different from NULL, it will move the packets into a designated rate limited sendqueue given by the snd_tag pointer. It is up to the individual drivers how the rate limited traffic will be rate limited. 3) Route changes are detected by the NIC drivers in the ifp->if_transmit() routine when the ifnet pointer in the incoming snd_tag mismatches the one of the network interface. The network adapter frees the mbuf and returns EAGAIN which causes the ip_output() to release and clear the send tag. Upon next ip_output() a new "snd_tag" will be tried allocated. 4) When the PCB is detached the custom sendqueue will be released by a non-blocking ifp->if_snd_tag_free() call to the currently bound network interface. Reviewed by: wblock (manpages), adrian, gallatin, scottl (network) Differential Revision: https://reviews.freebsd.org/D3687 Sponsored by: Mellanox Technologies MFC after: 3 months
2017-01-18 13:31:17 +00:00
#ifdef RATELIMIT
if (inp->inp_snd_tag != NULL)
in_pcbdetach_txrtlmt(inp);
#endif
Break out in_pcbdetach() into two functions: - in_pcbdetach(), which removes the link between an inpcb and its socket. - in_pcbfree(), which frees a detached pcb. Unlike the previous in_pcbdetach(), neither of these functions will attempt to conditionally free the socket, as they are responsible only for managing in_pcb memory. Mirror these changes into in6_pcbdetach() by breaking it into in6_pcbdetach() and in6_pcbfree(). While here, eliminate undesired checks for NULL inpcb pointers in sockets, as we will now have as an invariant that sockets will always have valid so_pcb pointers. MFC after: 3 months
2006-04-01 16:04:42 +00:00
inp->inp_socket->so_pcb = NULL;
inp->inp_socket = NULL;
}
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
/*
* in_pcbref() bumps the reference count on an inpcb in order to maintain
* stability of an inpcb pointer despite the inpcb lock being released. This
* is used in TCP when the inpcbinfo lock needs to be acquired or upgraded,
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
* but where the inpcb lock may already held, or when acquiring a reference
* via a pcbgroup.
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
*
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
* in_pcbref() should be used only to provide brief memory stability, and
* must always be followed by a call to INP_WLOCK() and in_pcbrele() to
* garbage collect the inpcb if it has been in_pcbfree()'d from another
* context. Until in_pcbrele() has returned that the inpcb is still valid,
* lock and rele are the *only* safe operations that may be performed on the
* inpcb.
*
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
* While the inpcb will not be freed, releasing the inpcb lock means that the
* connection's state may change, so the caller should be careful to
* revalidate any cached state on reacquiring the lock. Drop the reference
* using in_pcbrele().
*/
void
in_pcbref(struct inpcb *inp)
{
KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
refcount_acquire(&inp->inp_refcount);
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
}
/*
* Drop a refcount on an inpcb elevated using in_pcbref(); because a call to
* in_pcbfree() may have been made between in_pcbref() and in_pcbrele(), we
* return a flag indicating whether or not the inpcb remains valid. If it is
* valid, we return with the inpcb lock held.
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
*
* Notice that, unlike in_pcbref(), the inpcb lock must be held to drop a
* reference on an inpcb. Historically more work was done here (actually, in
* in_pcbfree_internal()) but has been moved to in_pcbfree() to avoid the
* need for the pcbinfo lock in in_pcbrele(). Deferring the free is entirely
* about memory stability (and continued use of the write lock).
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
*/
int
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
in_pcbrele_rlocked(struct inpcb *inp)
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
{
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
struct inpcbinfo *pcbinfo;
KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
INP_RLOCK_ASSERT(inp);
There is a complex race in in_pcblookup_hash() and in_pcblookup_group(). Both functions need to obtain lock on the found PCB, and they can't do classic inter-lock with the PCB hash lock, due to lock order reversal. To keep the PCB stable, these functions put a reference on it and after PCB lock is acquired drop it. If the reference was the last one, this means we've raced with in_pcbfree() and the PCB is no longer valid. This approach works okay only if we are acquiring writer-lock on the PCB. In case of reader-lock, the following scenario can happen: - 2 threads locate pcb, and do in_pcbref() on it. - These 2 threads drop the inp hash lock. - Another thread comes to delete pcb via in_pcbfree(), it obtains hash lock, does in_pcbremlists(), drops hash lock, and runs in_pcbrele_wlocked(), which doesn't free the pcb due to two references on it. Then it unlocks the pcb. - 2 aforementioned threads acquire reader lock on the pcb and run in_pcbrele_rlocked(). One gets 1 from in_pcbrele_rlocked() and continues, second gets 0 and considers pcb freed, returns. - The thread that got 1 continutes working with detached pcb, which later leads to panic in the underlying protocol level. To plumb that problem an additional INPCB flag introduced - INP_FREED. We check for that flag in the in_pcbrele_rlocked() and if it is set, we pretend that that was the last reference. Discussed with: rwatson, jhb Reported by: Vladimir Medvedkin <medved rambler-co.ru>
2012-10-02 12:03:02 +00:00
if (refcount_release(&inp->inp_refcount) == 0) {
/*
* If the inpcb has been freed, let the caller know, even if
* this isn't the last reference.
*/
if (inp->inp_flags2 & INP_FREED) {
INP_RUNLOCK(inp);
return (1);
}
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
return (0);
There is a complex race in in_pcblookup_hash() and in_pcblookup_group(). Both functions need to obtain lock on the found PCB, and they can't do classic inter-lock with the PCB hash lock, due to lock order reversal. To keep the PCB stable, these functions put a reference on it and after PCB lock is acquired drop it. If the reference was the last one, this means we've raced with in_pcbfree() and the PCB is no longer valid. This approach works okay only if we are acquiring writer-lock on the PCB. In case of reader-lock, the following scenario can happen: - 2 threads locate pcb, and do in_pcbref() on it. - These 2 threads drop the inp hash lock. - Another thread comes to delete pcb via in_pcbfree(), it obtains hash lock, does in_pcbremlists(), drops hash lock, and runs in_pcbrele_wlocked(), which doesn't free the pcb due to two references on it. Then it unlocks the pcb. - 2 aforementioned threads acquire reader lock on the pcb and run in_pcbrele_rlocked(). One gets 1 from in_pcbrele_rlocked() and continues, second gets 0 and considers pcb freed, returns. - The thread that got 1 continutes working with detached pcb, which later leads to panic in the underlying protocol level. To plumb that problem an additional INPCB flag introduced - INP_FREED. We check for that flag in the in_pcbrele_rlocked() and if it is set, we pretend that that was the last reference. Discussed with: rwatson, jhb Reported by: Vladimir Medvedkin <medved rambler-co.ru>
2012-10-02 12:03:02 +00:00
}
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
INP_RUNLOCK(inp);
pcbinfo = inp->inp_pcbinfo;
uma_zfree(pcbinfo->ipi_zone, inp);
return (1);
}
int
in_pcbrele_wlocked(struct inpcb *inp)
{
struct inpcbinfo *pcbinfo;
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
KASSERT(inp->inp_refcount > 0, ("%s: refcount 0", __func__));
INP_WLOCK_ASSERT(inp);
The r241129 description was wrong that the scenario is possible only for read locks on pcbs. The same race can happen with write lock semantics as well. The race scenario: - Two threads (1 and 2) locate pcb with writer semantics (INPLOOKUP_WLOCKPCB) and do in_pcbref() on it. - 1 and 2 both drop the inp hash lock. - Another thread (3) grabs the inp hash lock. Then it runs in_pcbfree(), which wlocks the pcb. They must happen faster than 1 or 2 come INP_WLOCK()! - 1 and 2 congest in INP_WLOCK(). - 3 does in_pcbremlists(), drops hash lock, and runs in_pcbrele_wlocked(), which doesn't free the pcb due to two references on it. Then it unlocks the pcb. - 1 (or 2) gets wlock on the pcb, runs in_pcbrele_wlocked(), which doesn't report inp as freed, due to 2 (or 1) still helding extra reference on it. The thread tries to do smth with a disconnected pcb and crashes. Submitted by: emeric.poupon@stormshield.eu Reviewed by: gleb@ MFC after: 1 week Sponsored by: Stormshield Tested by: Cassiano Peixoto, Stormshield
2015-11-25 14:45:43 +00:00
if (refcount_release(&inp->inp_refcount) == 0) {
/*
* If the inpcb has been freed, let the caller know, even if
* this isn't the last reference.
*/
if (inp->inp_flags2 & INP_FREED) {
INP_WUNLOCK(inp);
return (1);
}
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
return (0);
The r241129 description was wrong that the scenario is possible only for read locks on pcbs. The same race can happen with write lock semantics as well. The race scenario: - Two threads (1 and 2) locate pcb with writer semantics (INPLOOKUP_WLOCKPCB) and do in_pcbref() on it. - 1 and 2 both drop the inp hash lock. - Another thread (3) grabs the inp hash lock. Then it runs in_pcbfree(), which wlocks the pcb. They must happen faster than 1 or 2 come INP_WLOCK()! - 1 and 2 congest in INP_WLOCK(). - 3 does in_pcbremlists(), drops hash lock, and runs in_pcbrele_wlocked(), which doesn't free the pcb due to two references on it. Then it unlocks the pcb. - 1 (or 2) gets wlock on the pcb, runs in_pcbrele_wlocked(), which doesn't report inp as freed, due to 2 (or 1) still helding extra reference on it. The thread tries to do smth with a disconnected pcb and crashes. Submitted by: emeric.poupon@stormshield.eu Reviewed by: gleb@ MFC after: 1 week Sponsored by: Stormshield Tested by: Cassiano Peixoto, Stormshield
2015-11-25 14:45:43 +00:00
}
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
INP_WUNLOCK(inp);
pcbinfo = inp->inp_pcbinfo;
uma_zfree(pcbinfo->ipi_zone, inp);
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
return (1);
}
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
/*
* Temporary wrapper.
*/
int
in_pcbrele(struct inpcb *inp)
{
return (in_pcbrele_wlocked(inp));
}
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
/*
* Unconditionally schedule an inpcb to be freed by decrementing its
* reference count, which should occur only after the inpcb has been detached
* from its socket. If another thread holds a temporary reference (acquired
* using in_pcbref()) then the free is deferred until that reference is
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
* released using in_pcbrele(), but the inpcb is still unlocked. Almost all
* work, including removal from global lists, is done in this context, where
* the pcbinfo lock is held.
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
*/
void
in_pcbfree(struct inpcb *inp)
{
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
KASSERT(inp->inp_socket == NULL, ("%s: inp_socket != NULL", __func__));
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
#ifdef INVARIANTS
if (pcbinfo == &V_tcbinfo) {
Fix a kernel assertion issue introduced with r286227: Avoid too strict INP_INFO_RLOCK_ASSERT checks due to tcp_notify() being called from in6_pcbnotify(). Reported by: Larry Rosenman <ler@lerctr.org> Submitted by: markj, jch
2015-08-08 08:40:36 +00:00
INP_INFO_LOCK_ASSERT(pcbinfo);
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
} else {
INP_INFO_WLOCK_ASSERT(pcbinfo);
}
#endif
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
INP_WLOCK_ASSERT(inp);
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
/* XXXRW: Do as much as possible here. */
Merge projects/ipsec into head/. Small summary ------------- o Almost all IPsec releated code was moved into sys/netipsec. o New kernel modules added: ipsec.ko and tcpmd5.ko. New kernel option IPSEC_SUPPORT added. It enables support for loading and unloading of ipsec.ko and tcpmd5.ko kernel modules. o IPSEC_NAT_T option was removed. Now NAT-T support is enabled by default. The UDP_ENCAP_ESPINUDP_NON_IKE encapsulation type support was removed. Added TCP/UDP checksum handling for inbound packets that were decapsulated by transport mode SAs. setkey(8) modified to show run-time NAT-T configuration of SA. o New network pseudo interface if_ipsec(4) added. For now it is build as part of ipsec.ko module (or with IPSEC kernel). It implements IPsec virtual tunnels to create route-based VPNs. o The network stack now invokes IPsec functions using special methods. The only one header file <netipsec/ipsec_support.h> should be included to declare all the needed things to work with IPsec. o All IPsec protocols handlers (ESP/AH/IPCOMP protosw) were removed. Now these protocols are handled directly via IPsec methods. o TCP_SIGNATURE support was reworked to be more close to RFC. o PF_KEY SADB was reworked: - now all security associations stored in the single SPI namespace, and all SAs MUST have unique SPI. - several hash tables added to speed up lookups in SADB. - SADB now uses rmlock to protect access, and concurrent threads can do SA lookups in the same time. - many PF_KEY message handlers were reworked to reflect changes in SADB. - SADB_UPDATE message was extended to support new PF_KEY headers: SADB_X_EXT_NEW_ADDRESS_SRC and SADB_X_EXT_NEW_ADDRESS_DST. They can be used by IKE daemon to change SA addresses. o ipsecrequest and secpolicy structures were cardinally changed to avoid locking protection for ipsecrequest. Now we support only limited number (4) of bundled SAs, but they are supported for both INET and INET6. o INPCB security policy cache was introduced. Each PCB now caches used security policies to avoid SP lookup for each packet. o For inbound security policies added the mode, when the kernel does check for full history of applied IPsec transforms. o References counting rules for security policies and security associations were changed. The proper SA locking added into xform code. o xform code was also changed. Now it is possible to unregister xforms. tdb_xxx structures were changed and renamed to reflect changes in SADB/SPDB, and changed rules for locking and refcounting. Reviewed by: gnn, wblock Obtained from: Yandex LLC Relnotes: yes Sponsored by: Yandex LLC Differential Revision: https://reviews.freebsd.org/D9352
2017-02-06 08:49:57 +00:00
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
if (inp->inp_sp != NULL)
ipsec_delete_pcbpolicy(inp);
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_LIST_WLOCK(pcbinfo);
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
in_pcbremlists(inp);
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_LIST_WUNLOCK(pcbinfo);
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
#ifdef INET6
if (inp->inp_vflag & INP_IPV6PROTO) {
ip6_freepcbopts(inp->in6p_outputopts);
if (inp->in6p_moptions != NULL)
ip6_freemoptions(inp->in6p_moptions);
}
#endif
if (inp->inp_options)
(void)m_free(inp->inp_options);
#ifdef INET
if (inp->inp_moptions != NULL)
inp_freemoptions(inp->inp_moptions);
#endif
Reduce code duplication for inpcb route caching Add a new macro to clear both the L3 and L2 route caches, to hopefully prevent future instances where only the L3 cache was cleared when both should have been. MFC after: 1 week Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D13989 Reviewed by: karels
2018-01-23 03:15:39 +00:00
RO_INVALIDATE_CACHE(&inp->inp_route);
FreeBSD previously provided route caching for TCP (and UDP). Re-add route caching for TCP, with some improvements. In particular, invalidate the route cache if a new route is added, which might be a better match. The cache is automatically invalidated if the old route is deleted. Submitted by: Mike Karels Reviewed by: gnn Differential Revision: https://reviews.freebsd.org/D4306
2016-03-24 07:54:56 +00:00
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
inp->inp_vflag = 0;
There is a complex race in in_pcblookup_hash() and in_pcblookup_group(). Both functions need to obtain lock on the found PCB, and they can't do classic inter-lock with the PCB hash lock, due to lock order reversal. To keep the PCB stable, these functions put a reference on it and after PCB lock is acquired drop it. If the reference was the last one, this means we've raced with in_pcbfree() and the PCB is no longer valid. This approach works okay only if we are acquiring writer-lock on the PCB. In case of reader-lock, the following scenario can happen: - 2 threads locate pcb, and do in_pcbref() on it. - These 2 threads drop the inp hash lock. - Another thread comes to delete pcb via in_pcbfree(), it obtains hash lock, does in_pcbremlists(), drops hash lock, and runs in_pcbrele_wlocked(), which doesn't free the pcb due to two references on it. Then it unlocks the pcb. - 2 aforementioned threads acquire reader lock on the pcb and run in_pcbrele_rlocked(). One gets 1 from in_pcbrele_rlocked() and continues, second gets 0 and considers pcb freed, returns. - The thread that got 1 continutes working with detached pcb, which later leads to panic in the underlying protocol level. To plumb that problem an additional INPCB flag introduced - INP_FREED. We check for that flag in the in_pcbrele_rlocked() and if it is set, we pretend that that was the last reference. Discussed with: rwatson, jhb Reported by: Vladimir Medvedkin <medved rambler-co.ru>
2012-10-02 12:03:02 +00:00
inp->inp_flags2 |= INP_FREED;
Continue to refine inpcb reference counting and locking, in preparation for reworking of inpcbinfo locking: (1) Convert inpcb reference counting from manually manipulated integers to the refcount(9) KPI. This allows the refcount to be managed atomically with an inpcb read lock rather than write lock, or even with no inpcb lock at all. As a result, in_pcbref() also no longer requires an inpcb lock, so can be performed solely using the lock used to look up an inpcb. (2) Shift more inpcb freeing activity from the in_pcbrele() context (via in_pcbfree_internal) to the explicit in_pcbfree() context. This means that the inpcb refcount is increasingly used only to maintain memory stability, not actually defer the clean up of inpcb protocol parts. This is desirable as many of those protocol parts required the pcbinfo lock, which we'd like not to acquire in in_pcbrele() contexts. Document this in comments better. (3) Introduce new read-locked and write-locked in_pcbrele() variations, in_pcbrele_rlocked() and in_pcbrele_wlocked(), which allow the inpcb to be properly unlocked as needed. in_pcbrele() is a wrapper around the latter, and should probably go away at some point. This makes it easier to use this weak reference model when holding only a read lock, as will happen in the future. This may well be safe to MFC, but some more KBI analysis is required. Reviewed by: bz MFC after: 3 weeks Sponsored by: Juniper Networks, Inc.
2011-05-23 19:32:02 +00:00
crfree(inp->inp_cred);
#ifdef MAC
mac_inpcb_destroy(inp);
#endif
if (!in_pcbrele_wlocked(inp))
Add a reference count to struct inpcb, which may be explicitly incremented using in_pcbref(), and decremented using in_pcbfree() or inpcbrele(). Protocols using only current in_pcballoc() and in_pcbfree() calls will see the same semantics, but it is now possible for TCP to call in_pcbref() and in_pcbrele() to prevent an inpcb from being freed when both tcbinfo and per-inpcb locks are released. This makes it possible to safely transition from holding only the inpcb lock to both tcbinfo and inpcb lock without re-looking up a connection in the input path, timer path, etc. Notice that in_pcbrele() does not unlock the connection after decrementing the refcount, if the connection remains, so that the caller can continue to use it; in_pcbrele() returns a flag indicating whether or not the inpcb pointer is still valid, and in_pcbfee() is now a simple wrapper around in_pcbrele(). MFC after: 1 month Discussed with: bz, kmacy Reviewed by: bz, gnn, kmacy Tested by: kmacy
2008-12-08 20:18:50 +00:00
INP_WUNLOCK(inp);
}
Abstract inpcb drop logic, previously just setting of INP_DROPPED in TCP, into in_pcbdrop(). Expand logic to detach the inpcb from its bound address/port so that dropping a TCP connection releases the inpcb resource reservation, which since the introduction of socket/pcb reference count updates, has been persisting until the socket closed rather than being released implicitly due to prior freeing of the inpcb on TCP drop. MFC after: 3 months
2006-04-25 11:17:35 +00:00
/*
Expand comments relating various detach/free/drop inpcb routines. MFC after: 3 days
2008-09-29 13:50:17 +00:00
* in_pcbdrop() removes an inpcb from hashed lists, releasing its address and
* port reservation, and preventing it from being returned by inpcb lookups.
*
* It is used by TCP to mark an inpcb as unused and avoid future packet
* delivery or event notification when a socket remains open but TCP has
* closed. This might occur as a result of a shutdown()-initiated TCP close
* or a RST on the wire, and allows the port binding to be reused while still
* maintaining the invariant that so_pcb always points to a valid inpcb until
* in_pcbdetach().
*
* XXXRW: Possibly in_pcbdrop() should also prevent future notifications by
* in_pcbnotifyall() and in_pcbpurgeif0()?
Abstract inpcb drop logic, previously just setting of INP_DROPPED in TCP, into in_pcbdrop(). Expand logic to detach the inpcb from its bound address/port so that dropping a TCP connection releases the inpcb resource reservation, which since the introduction of socket/pcb reference count updates, has been persisting until the socket closed rather than being released implicitly due to prior freeing of the inpcb on TCP drop. MFC after: 3 months
2006-04-25 11:17:35 +00:00
*/
void
in_pcbdrop(struct inpcb *inp)
{
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK_ASSERT(inp);
Abstract inpcb drop logic, previously just setting of INP_DROPPED in TCP, into in_pcbdrop(). Expand logic to detach the inpcb from its bound address/port so that dropping a TCP connection releases the inpcb resource reservation, which since the introduction of socket/pcb reference count updates, has been persisting until the socket closed rather than being released implicitly due to prior freeing of the inpcb on TCP drop. MFC after: 3 months
2006-04-25 11:17:35 +00:00
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
/*
* XXXRW: Possibly we should protect the setting of INP_DROPPED with
* the hash lock...?
*/
Correct a number of evolved problems with inp_vflag and inp_flags: certain flags that should have been in inp_flags ended up in inp_vflag, meaning that they were inconsistently locked, and in one case, interpreted. Move the following flags from inp_vflag to gaps in the inp_flags space (and clean up the inp_flags constants to make gaps more obvious to future takers): INP_TIMEWAIT INP_SOCKREF INP_ONESBCAST INP_DROPPED Some aspects of this change have no effect on kernel ABI at all, as these are UDP/TCP/IP-internal uses; however, netstat and sockstat detect INP_TIMEWAIT when listing TCP sockets, so any MFC will need to take this into account. MFC after: 1 week (or after dependencies are MFC'd) Reviewed by: bz
2009-03-15 09:58:31 +00:00
inp->inp_flags |= INP_DROPPED;
Add INP_INHASHLIST flag for inpcb->inp_flags to indicate whether or not the inpcb is currenty on various hash lookup lists, rather than using (lport != 0) to detect this. This means that the full 4-tuple of a connection can be retained after close, which should lead to more sensible netstat output in the window between TCP close and socket close. MFC after: 2 weeks
2009-03-11 00:29:22 +00:00
if (inp->inp_flags & INP_INHASHLIST) {
Abstract inpcb drop logic, previously just setting of INP_DROPPED in TCP, into in_pcbdrop(). Expand logic to detach the inpcb from its bound address/port so that dropping a TCP connection releases the inpcb resource reservation, which since the introduction of socket/pcb reference count updates, has been persisting until the socket closed rather than being released implicitly due to prior freeing of the inpcb on TCP drop. MFC after: 3 months
2006-04-25 11:17:35 +00:00
struct inpcbport *phd = inp->inp_phd;
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_WLOCK(inp->inp_pcbinfo);
Abstract inpcb drop logic, previously just setting of INP_DROPPED in TCP, into in_pcbdrop(). Expand logic to detach the inpcb from its bound address/port so that dropping a TCP connection releases the inpcb resource reservation, which since the introduction of socket/pcb reference count updates, has been persisting until the socket closed rather than being released implicitly due to prior freeing of the inpcb on TCP drop. MFC after: 3 months
2006-04-25 11:17:35 +00:00
LIST_REMOVE(inp, inp_hash);
LIST_REMOVE(inp, inp_portlist);
if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
LIST_REMOVE(phd, phd_hash);
free(phd, M_PCB);
}
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_WUNLOCK(inp->inp_pcbinfo);
Add INP_INHASHLIST flag for inpcb->inp_flags to indicate whether or not the inpcb is currenty on various hash lookup lists, rather than using (lport != 0) to detect this. This means that the full 4-tuple of a connection can be retained after close, which should lead to more sensible netstat output in the window between TCP close and socket close. MFC after: 2 weeks
2009-03-11 00:29:22 +00:00
inp->inp_flags &= ~INP_INHASHLIST;
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#ifdef PCBGROUP
in_pcbgroup_remove(inp);
#endif
Abstract inpcb drop logic, previously just setting of INP_DROPPED in TCP, into in_pcbdrop(). Expand logic to detach the inpcb from its bound address/port so that dropping a TCP connection releases the inpcb resource reservation, which since the introduction of socket/pcb reference count updates, has been persisting until the socket closed rather than being released implicitly due to prior freeing of the inpcb on TCP drop. MFC after: 3 months
2006-04-25 11:17:35 +00:00
}
}
Make the PCB code compile without INET support by adding #ifdef INETs and correcting few #includes. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-30 11:04:34 +00:00
#ifdef INET
Reduce network stack oddness: implement .pru_sockaddr and .pru_peeraddr protocol entry points using functions named proto_getsockaddr and proto_getpeeraddr rather than proto_setsockaddr and proto_setpeeraddr. While it's true that sockaddrs are allocated and set, the net effect is to retrieve (get) the socket address or peer address from a socket, not set it, so align names to that intent.
2007-05-11 10:20:51 +00:00
/*
* Common routines to return the socket addresses associated with inpcbs.
*/
Create new functions in_sockaddr(), in6_sockaddr(), and in6_v4mapsin6_sockaddr() which allocate the appropriate sockaddr_in* structure and initialize it with the address and port information passed as arguments. Use calls to these new functions to replace code that is replicated multiple times in in_setsockaddr(), in_setpeeraddr(), in6_setsockaddr(), in6_setpeeraddr(), in6_mapped_sockaddr(), and in6_mapped_peeraddr(). Inline COMMON_END in tcp_usr_accept() so that we can call in_sockaddr() with temporary copies of the address and port after the PCB is unlocked. Fix the lock violation in tcp6_usr_accept() (caused by calling MALLOC() inside in6_mapped_peeraddr() while the PCB is locked) by changing the implementation of tcp6_usr_accept() to match tcp_usr_accept(). Reviewed by: suz
2002-08-21 11:57:12 +00:00
struct sockaddr *
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_sockaddr(in_port_t port, struct in_addr *addr_p)
Create new functions in_sockaddr(), in6_sockaddr(), and in6_v4mapsin6_sockaddr() which allocate the appropriate sockaddr_in* structure and initialize it with the address and port information passed as arguments. Use calls to these new functions to replace code that is replicated multiple times in in_setsockaddr(), in_setpeeraddr(), in6_setsockaddr(), in6_setpeeraddr(), in6_mapped_sockaddr(), and in6_mapped_peeraddr(). Inline COMMON_END in tcp_usr_accept() so that we can call in_sockaddr() with temporary copies of the address and port after the PCB is unlocked. Fix the lock violation in tcp6_usr_accept() (caused by calling MALLOC() inside in6_mapped_peeraddr() while the PCB is locked) by changing the implementation of tcp6_usr_accept() to match tcp_usr_accept(). Reviewed by: suz
2002-08-21 11:57:12 +00:00
{
struct sockaddr_in *sin;
Retire the MALLOC and FREE macros. They are an abomination unto style(9). MFC after: 3 months
2008-10-23 15:53:51 +00:00
sin = malloc(sizeof *sin, M_SONAME,
Back out M_* changes, per decision of the TRB. Approved by: trb
2003-02-19 05:47:46 +00:00
M_WAITOK | M_ZERO);
Create new functions in_sockaddr(), in6_sockaddr(), and in6_v4mapsin6_sockaddr() which allocate the appropriate sockaddr_in* structure and initialize it with the address and port information passed as arguments. Use calls to these new functions to replace code that is replicated multiple times in in_setsockaddr(), in_setpeeraddr(), in6_setsockaddr(), in6_setpeeraddr(), in6_mapped_sockaddr(), and in6_mapped_peeraddr(). Inline COMMON_END in tcp_usr_accept() so that we can call in_sockaddr() with temporary copies of the address and port after the PCB is unlocked. Fix the lock violation in tcp6_usr_accept() (caused by calling MALLOC() inside in6_mapped_peeraddr() while the PCB is locked) by changing the implementation of tcp6_usr_accept() to match tcp_usr_accept(). Reviewed by: suz
2002-08-21 11:57:12 +00:00
sin->sin_family = AF_INET;
sin->sin_len = sizeof(*sin);
sin->sin_addr = *addr_p;
sin->sin_port = port;
return (struct sockaddr *)sin;
}
Convert raw IP from mondo-switch-statement-from-Hell to pr_usrreqs. Collapse duplicates with udp_usrreq.c and tcp_usrreq.c (calling the generic routines in uipc_socket2.c and in_pcb.c). Calling sockaddr()_ or peeraddr() on a detached socket now traps, rather than harmlessly returning an error; this should never happen. Allow the raw IP buffer sizes to be controlled via sysctl.
1997-02-18 20:46:36 +00:00
int
Reduce network stack oddness: implement .pru_sockaddr and .pru_peeraddr protocol entry points using functions named proto_getsockaddr and proto_getpeeraddr rather than proto_setsockaddr and proto_setpeeraddr. While it's true that sockaddrs are allocated and set, the net effect is to retrieve (get) the socket address or peer address from a socket, not set it, so align names to that intent.
2007-05-11 10:20:51 +00:00
in_getsockaddr(struct socket *so, struct sockaddr **nam)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
struct inpcb *inp;
Create new functions in_sockaddr(), in6_sockaddr(), and in6_v4mapsin6_sockaddr() which allocate the appropriate sockaddr_in* structure and initialize it with the address and port information passed as arguments. Use calls to these new functions to replace code that is replicated multiple times in in_setsockaddr(), in_setpeeraddr(), in6_setsockaddr(), in6_setpeeraddr(), in6_mapped_sockaddr(), and in6_mapped_peeraddr(). Inline COMMON_END in tcp_usr_accept() so that we can call in_sockaddr() with temporary copies of the address and port after the PCB is unlocked. Fix the lock violation in tcp6_usr_accept() (caused by calling MALLOC() inside in6_mapped_peeraddr() while the PCB is locked) by changing the implementation of tcp6_usr_accept() to match tcp_usr_accept(). Reviewed by: suz
2002-08-21 11:57:12 +00:00
struct in_addr addr;
in_port_t port;
The spl fixes in in_setsockaddr and in_setpeeraddr that were meant to fix PR#3618 weren't sufficient since malloc() can block - allowing the net interrupts in and leading to the same problem mentioned in the PR (a panic). The order of operations has been changed so that this is no longer a problem. Needs to be brought into the 2.2.x branch. PR: 3618
1997-12-25 06:57:36 +00:00
Break apart initialization of s and inp from the declarations in in_setsockaddr and in_setpeeraddr. Suggested by: Justin T. Gibbs <gibbs@plutotech.com>
1997-05-19 01:28:39 +00:00
inp = sotoinpcb(so);
Reduce network stack oddness: implement .pru_sockaddr and .pru_peeraddr protocol entry points using functions named proto_getsockaddr and proto_getpeeraddr rather than proto_setsockaddr and proto_setpeeraddr. While it's true that sockaddrs are allocated and set, the net effect is to retrieve (get) the socket address or peer address from a socket, not set it, so align names to that intent.
2007-05-11 10:20:51 +00:00
KASSERT(inp != NULL, ("in_getsockaddr: inp == NULL"));
Remove pcbinfo locking from in_setsockaddr() and in_setpeeraddr(); holding the inpcb lock is sufficient to prevent races in reading the address and port, as both the inpcb lock and pcbinfo lock are required to change the address/port. Improve consistency of spelling in assertions about inp != NULL. MFC after: 3 months
2006-04-22 19:10:02 +00:00
When querying the local or foreign address from an IP socket, acquire only a read lock on the inpcb. When an external module requests a read lock, acquire only a read lock. MFC after: 3 months
2008-04-19 14:34:38 +00:00
INP_RLOCK(inp);
Create new functions in_sockaddr(), in6_sockaddr(), and in6_v4mapsin6_sockaddr() which allocate the appropriate sockaddr_in* structure and initialize it with the address and port information passed as arguments. Use calls to these new functions to replace code that is replicated multiple times in in_setsockaddr(), in_setpeeraddr(), in6_setsockaddr(), in6_setpeeraddr(), in6_mapped_sockaddr(), and in6_mapped_peeraddr(). Inline COMMON_END in tcp_usr_accept() so that we can call in_sockaddr() with temporary copies of the address and port after the PCB is unlocked. Fix the lock violation in tcp6_usr_accept() (caused by calling MALLOC() inside in6_mapped_peeraddr() while the PCB is locked) by changing the implementation of tcp6_usr_accept() to match tcp_usr_accept(). Reviewed by: suz
2002-08-21 11:57:12 +00:00
port = inp->inp_lport;
addr = inp->inp_laddr;
When querying the local or foreign address from an IP socket, acquire only a read lock on the inpcb. When an external module requests a read lock, acquire only a read lock. MFC after: 3 months
2008-04-19 14:34:38 +00:00
INP_RUNLOCK(inp);
The spl fixes in in_setsockaddr and in_setpeeraddr that were meant to fix PR#3618 weren't sufficient since malloc() can block - allowing the net interrupts in and leading to the same problem mentioned in the PR (a panic). The order of operations has been changed so that this is no longer a problem. Needs to be brought into the 2.2.x branch. PR: 3618
1997-12-25 06:57:36 +00:00
Create new functions in_sockaddr(), in6_sockaddr(), and in6_v4mapsin6_sockaddr() which allocate the appropriate sockaddr_in* structure and initialize it with the address and port information passed as arguments. Use calls to these new functions to replace code that is replicated multiple times in in_setsockaddr(), in_setpeeraddr(), in6_setsockaddr(), in6_setpeeraddr(), in6_mapped_sockaddr(), and in6_mapped_peeraddr(). Inline COMMON_END in tcp_usr_accept() so that we can call in_sockaddr() with temporary copies of the address and port after the PCB is unlocked. Fix the lock violation in tcp6_usr_accept() (caused by calling MALLOC() inside in6_mapped_peeraddr() while the PCB is locked) by changing the implementation of tcp6_usr_accept() to match tcp_usr_accept(). Reviewed by: suz
2002-08-21 11:57:12 +00:00
*nam = in_sockaddr(port, &addr);
Convert raw IP from mondo-switch-statement-from-Hell to pr_usrreqs. Collapse duplicates with udp_usrreq.c and tcp_usrreq.c (calling the generic routines in uipc_socket2.c and in_pcb.c). Calling sockaddr()_ or peeraddr() on a detached socket now traps, rather than harmlessly returning an error; this should never happen. Allow the raw IP buffer sizes to be controlled via sysctl.
1997-02-18 20:46:36 +00:00
return 0;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
Convert raw IP from mondo-switch-statement-from-Hell to pr_usrreqs. Collapse duplicates with udp_usrreq.c and tcp_usrreq.c (calling the generic routines in uipc_socket2.c and in_pcb.c). Calling sockaddr()_ or peeraddr() on a detached socket now traps, rather than harmlessly returning an error; this should never happen. Allow the raw IP buffer sizes to be controlled via sysctl.
1997-02-18 20:46:36 +00:00
int
Reduce network stack oddness: implement .pru_sockaddr and .pru_peeraddr protocol entry points using functions named proto_getsockaddr and proto_getpeeraddr rather than proto_setsockaddr and proto_setpeeraddr. While it's true that sockaddrs are allocated and set, the net effect is to retrieve (get) the socket address or peer address from a socket, not set it, so align names to that intent.
2007-05-11 10:20:51 +00:00
in_getpeeraddr(struct socket *so, struct sockaddr **nam)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
struct inpcb *inp;
Create new functions in_sockaddr(), in6_sockaddr(), and in6_v4mapsin6_sockaddr() which allocate the appropriate sockaddr_in* structure and initialize it with the address and port information passed as arguments. Use calls to these new functions to replace code that is replicated multiple times in in_setsockaddr(), in_setpeeraddr(), in6_setsockaddr(), in6_setpeeraddr(), in6_mapped_sockaddr(), and in6_mapped_peeraddr(). Inline COMMON_END in tcp_usr_accept() so that we can call in_sockaddr() with temporary copies of the address and port after the PCB is unlocked. Fix the lock violation in tcp6_usr_accept() (caused by calling MALLOC() inside in6_mapped_peeraddr() while the PCB is locked) by changing the implementation of tcp6_usr_accept() to match tcp_usr_accept(). Reviewed by: suz
2002-08-21 11:57:12 +00:00
struct in_addr addr;
in_port_t port;
The spl fixes in in_setsockaddr and in_setpeeraddr that were meant to fix PR#3618 weren't sufficient since malloc() can block - allowing the net interrupts in and leading to the same problem mentioned in the PR (a panic). The order of operations has been changed so that this is no longer a problem. Needs to be brought into the 2.2.x branch. PR: 3618
1997-12-25 06:57:36 +00:00
Break apart initialization of s and inp from the declarations in in_setsockaddr and in_setpeeraddr. Suggested by: Justin T. Gibbs <gibbs@plutotech.com>
1997-05-19 01:28:39 +00:00
inp = sotoinpcb(so);
Reduce network stack oddness: implement .pru_sockaddr and .pru_peeraddr protocol entry points using functions named proto_getsockaddr and proto_getpeeraddr rather than proto_setsockaddr and proto_setpeeraddr. While it's true that sockaddrs are allocated and set, the net effect is to retrieve (get) the socket address or peer address from a socket, not set it, so align names to that intent.
2007-05-11 10:20:51 +00:00
KASSERT(inp != NULL, ("in_getpeeraddr: inp == NULL"));
Remove pcbinfo locking from in_setsockaddr() and in_setpeeraddr(); holding the inpcb lock is sufficient to prevent races in reading the address and port, as both the inpcb lock and pcbinfo lock are required to change the address/port. Improve consistency of spelling in assertions about inp != NULL. MFC after: 3 months
2006-04-22 19:10:02 +00:00
When querying the local or foreign address from an IP socket, acquire only a read lock on the inpcb. When an external module requests a read lock, acquire only a read lock. MFC after: 3 months
2008-04-19 14:34:38 +00:00
INP_RLOCK(inp);
Create new functions in_sockaddr(), in6_sockaddr(), and in6_v4mapsin6_sockaddr() which allocate the appropriate sockaddr_in* structure and initialize it with the address and port information passed as arguments. Use calls to these new functions to replace code that is replicated multiple times in in_setsockaddr(), in_setpeeraddr(), in6_setsockaddr(), in6_setpeeraddr(), in6_mapped_sockaddr(), and in6_mapped_peeraddr(). Inline COMMON_END in tcp_usr_accept() so that we can call in_sockaddr() with temporary copies of the address and port after the PCB is unlocked. Fix the lock violation in tcp6_usr_accept() (caused by calling MALLOC() inside in6_mapped_peeraddr() while the PCB is locked) by changing the implementation of tcp6_usr_accept() to match tcp_usr_accept(). Reviewed by: suz
2002-08-21 11:57:12 +00:00
port = inp->inp_fport;
addr = inp->inp_faddr;
When querying the local or foreign address from an IP socket, acquire only a read lock on the inpcb. When an external module requests a read lock, acquire only a read lock. MFC after: 3 months
2008-04-19 14:34:38 +00:00
INP_RUNLOCK(inp);
The spl fixes in in_setsockaddr and in_setpeeraddr that were meant to fix PR#3618 weren't sufficient since malloc() can block - allowing the net interrupts in and leading to the same problem mentioned in the PR (a panic). The order of operations has been changed so that this is no longer a problem. Needs to be brought into the 2.2.x branch. PR: 3618
1997-12-25 06:57:36 +00:00
Create new functions in_sockaddr(), in6_sockaddr(), and in6_v4mapsin6_sockaddr() which allocate the appropriate sockaddr_in* structure and initialize it with the address and port information passed as arguments. Use calls to these new functions to replace code that is replicated multiple times in in_setsockaddr(), in_setpeeraddr(), in6_setsockaddr(), in6_setpeeraddr(), in6_mapped_sockaddr(), and in6_mapped_peeraddr(). Inline COMMON_END in tcp_usr_accept() so that we can call in_sockaddr() with temporary copies of the address and port after the PCB is unlocked. Fix the lock violation in tcp6_usr_accept() (caused by calling MALLOC() inside in6_mapped_peeraddr() while the PCB is locked) by changing the implementation of tcp6_usr_accept() to match tcp_usr_accept(). Reviewed by: suz
2002-08-21 11:57:12 +00:00
*nam = in_sockaddr(port, &addr);
Convert raw IP from mondo-switch-statement-from-Hell to pr_usrreqs. Collapse duplicates with udp_usrreq.c and tcp_usrreq.c (calling the generic routines in uipc_socket2.c and in_pcb.c). Calling sockaddr()_ or peeraddr() on a detached socket now traps, rather than harmlessly returning an error; this should never happen. Allow the raw IP buffer sizes to be controlled via sysctl.
1997-02-18 20:46:36 +00:00
return 0;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
void
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr faddr, int errno,
struct inpcb *(*notify)(struct inpcb *, int))
Redo the security update done in rev 1.54 of src/sys/netinet/tcp_subr.c and 1.84 of src/sys/netinet/udp_usrreq.c The changes broken down: - remove 0 as a wildcard for addresses and port numbers in src/sys/netinet/in_pcb.c:in_pcbnotify() - add src/sys/netinet/in_pcb.c:in_pcbnotifyall() used to notify all sessions with the specific remote address. - change - src/sys/netinet/udp_usrreq.c:udp_ctlinput() - src/sys/netinet/tcp_subr.c:tcp_ctlinput() to use in_pcbnotifyall() to notify multiple sessions, instead of using in_pcbnotify() with 0 as src address and as port numbers. - remove check for src port == 0 in - src/sys/netinet/tcp_subr.c:tcp_ctlinput() - src/sys/netinet/udp_usrreq.c:udp_ctlinput() as they are no longer needed. - move handling of redirects and host dead from in_pcbnotify() to udp_ctlinput() and tcp_ctlinput(), so they will call in_pcbnotifyall() to notify all sessions with the specific remote address. Approved by: jlemon Inspired by: NetBSD
2001-02-22 21:23:45 +00:00
{
In in_pcbnotifyall() and in6_pcbnotify(), use LIST_FOREACH_SAFE() and eliminate unnecessary local variable caching of the list head pointer, making the code a bit easier to read. MFC after: 3 weeks
2008-04-06 21:20:56 +00:00
struct inpcb *inp, *inp_temp;
Redo the security update done in rev 1.54 of src/sys/netinet/tcp_subr.c and 1.84 of src/sys/netinet/udp_usrreq.c The changes broken down: - remove 0 as a wildcard for addresses and port numbers in src/sys/netinet/in_pcb.c:in_pcbnotify() - add src/sys/netinet/in_pcb.c:in_pcbnotifyall() used to notify all sessions with the specific remote address. - change - src/sys/netinet/udp_usrreq.c:udp_ctlinput() - src/sys/netinet/tcp_subr.c:tcp_ctlinput() to use in_pcbnotifyall() to notify multiple sessions, instead of using in_pcbnotify() with 0 as src address and as port numbers. - remove check for src port == 0 in - src/sys/netinet/tcp_subr.c:tcp_ctlinput() - src/sys/netinet/udp_usrreq.c:udp_ctlinput() as they are no longer needed. - move handling of redirects and host dead from in_pcbnotify() to udp_ctlinput() and tcp_ctlinput(), so they will call in_pcbnotifyall() to notify all sessions with the specific remote address. Approved by: jlemon Inspired by: NetBSD
2001-02-22 21:23:45 +00:00
in_pcbnotifyall() requires an exclusive protocol lock for notify functions which modify the connection list, namely, tcp_notify().
2003-02-12 23:55:07 +00:00
INP_INFO_WLOCK(pcbinfo);
In in_pcbnotifyall() and in6_pcbnotify(), use LIST_FOREACH_SAFE() and eliminate unnecessary local variable caching of the list head pointer, making the code a bit easier to read. MFC after: 3 weeks
2008-04-06 21:20:56 +00:00
LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK(inp);
Redo the security update done in rev 1.54 of src/sys/netinet/tcp_subr.c and 1.84 of src/sys/netinet/udp_usrreq.c The changes broken down: - remove 0 as a wildcard for addresses and port numbers in src/sys/netinet/in_pcb.c:in_pcbnotify() - add src/sys/netinet/in_pcb.c:in_pcbnotifyall() used to notify all sessions with the specific remote address. - change - src/sys/netinet/udp_usrreq.c:udp_ctlinput() - src/sys/netinet/tcp_subr.c:tcp_ctlinput() to use in_pcbnotifyall() to notify multiple sessions, instead of using in_pcbnotify() with 0 as src address and as port numbers. - remove check for src port == 0 in - src/sys/netinet/tcp_subr.c:tcp_ctlinput() - src/sys/netinet/udp_usrreq.c:udp_ctlinput() as they are no longer needed. - move handling of redirects and host dead from in_pcbnotify() to udp_ctlinput() and tcp_ctlinput(), so they will call in_pcbnotifyall() to notify all sessions with the specific remote address. Approved by: jlemon Inspired by: NetBSD
2001-02-22 21:23:45 +00:00
#ifdef INET6
Lock up inpcb. Submitted by: Jennifer Yang <yangjihui@yahoo.com>
2002-06-10 20:05:46 +00:00
if ((inp->inp_vflag & INP_IPV4) == 0) {
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WUNLOCK(inp);
Redo the security update done in rev 1.54 of src/sys/netinet/tcp_subr.c and 1.84 of src/sys/netinet/udp_usrreq.c The changes broken down: - remove 0 as a wildcard for addresses and port numbers in src/sys/netinet/in_pcb.c:in_pcbnotify() - add src/sys/netinet/in_pcb.c:in_pcbnotifyall() used to notify all sessions with the specific remote address. - change - src/sys/netinet/udp_usrreq.c:udp_ctlinput() - src/sys/netinet/tcp_subr.c:tcp_ctlinput() to use in_pcbnotifyall() to notify multiple sessions, instead of using in_pcbnotify() with 0 as src address and as port numbers. - remove check for src port == 0 in - src/sys/netinet/tcp_subr.c:tcp_ctlinput() - src/sys/netinet/udp_usrreq.c:udp_ctlinput() as they are no longer needed. - move handling of redirects and host dead from in_pcbnotify() to udp_ctlinput() and tcp_ctlinput(), so they will call in_pcbnotifyall() to notify all sessions with the specific remote address. Approved by: jlemon Inspired by: NetBSD
2001-02-22 21:23:45 +00:00
continue;
Lock up inpcb. Submitted by: Jennifer Yang <yangjihui@yahoo.com>
2002-06-10 20:05:46 +00:00
}
Redo the security update done in rev 1.54 of src/sys/netinet/tcp_subr.c and 1.84 of src/sys/netinet/udp_usrreq.c The changes broken down: - remove 0 as a wildcard for addresses and port numbers in src/sys/netinet/in_pcb.c:in_pcbnotify() - add src/sys/netinet/in_pcb.c:in_pcbnotifyall() used to notify all sessions with the specific remote address. - change - src/sys/netinet/udp_usrreq.c:udp_ctlinput() - src/sys/netinet/tcp_subr.c:tcp_ctlinput() to use in_pcbnotifyall() to notify multiple sessions, instead of using in_pcbnotify() with 0 as src address and as port numbers. - remove check for src port == 0 in - src/sys/netinet/tcp_subr.c:tcp_ctlinput() - src/sys/netinet/udp_usrreq.c:udp_ctlinput() as they are no longer needed. - move handling of redirects and host dead from in_pcbnotify() to udp_ctlinput() and tcp_ctlinput(), so they will call in_pcbnotifyall() to notify all sessions with the specific remote address. Approved by: jlemon Inspired by: NetBSD
2001-02-22 21:23:45 +00:00
#endif
if (inp->inp_faddr.s_addr != faddr.s_addr ||
Lock up inpcb. Submitted by: Jennifer Yang <yangjihui@yahoo.com>
2002-06-10 20:05:46 +00:00
inp->inp_socket == NULL) {
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WUNLOCK(inp);
in_pcbnotifyall() requires an exclusive protocol lock for notify functions which modify the connection list, namely, tcp_notify().
2003-02-12 23:55:07 +00:00
continue;
Lock up inpcb. Submitted by: Jennifer Yang <yangjihui@yahoo.com>
2002-06-10 20:05:46 +00:00
}
in_pcbnotifyall() requires an exclusive protocol lock for notify functions which modify the connection list, namely, tcp_notify().
2003-02-12 23:55:07 +00:00
if ((*notify)(inp, errno))
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WUNLOCK(inp);
Redo the security update done in rev 1.54 of src/sys/netinet/tcp_subr.c and 1.84 of src/sys/netinet/udp_usrreq.c The changes broken down: - remove 0 as a wildcard for addresses and port numbers in src/sys/netinet/in_pcb.c:in_pcbnotify() - add src/sys/netinet/in_pcb.c:in_pcbnotifyall() used to notify all sessions with the specific remote address. - change - src/sys/netinet/udp_usrreq.c:udp_ctlinput() - src/sys/netinet/tcp_subr.c:tcp_ctlinput() to use in_pcbnotifyall() to notify multiple sessions, instead of using in_pcbnotify() with 0 as src address and as port numbers. - remove check for src port == 0 in - src/sys/netinet/tcp_subr.c:tcp_ctlinput() - src/sys/netinet/udp_usrreq.c:udp_ctlinput() as they are no longer needed. - move handling of redirects and host dead from in_pcbnotify() to udp_ctlinput() and tcp_ctlinput(), so they will call in_pcbnotifyall() to notify all sessions with the specific remote address. Approved by: jlemon Inspired by: NetBSD
2001-02-22 21:23:45 +00:00
}
in_pcbnotifyall() requires an exclusive protocol lock for notify functions which modify the connection list, namely, tcp_notify().
2003-02-12 23:55:07 +00:00
INP_INFO_WUNLOCK(pcbinfo);
Redo the security update done in rev 1.54 of src/sys/netinet/tcp_subr.c and 1.84 of src/sys/netinet/udp_usrreq.c The changes broken down: - remove 0 as a wildcard for addresses and port numbers in src/sys/netinet/in_pcb.c:in_pcbnotify() - add src/sys/netinet/in_pcb.c:in_pcbnotifyall() used to notify all sessions with the specific remote address. - change - src/sys/netinet/udp_usrreq.c:udp_ctlinput() - src/sys/netinet/tcp_subr.c:tcp_ctlinput() to use in_pcbnotifyall() to notify multiple sessions, instead of using in_pcbnotify() with 0 as src address and as port numbers. - remove check for src port == 0 in - src/sys/netinet/tcp_subr.c:tcp_ctlinput() - src/sys/netinet/udp_usrreq.c:udp_ctlinput() as they are no longer needed. - move handling of redirects and host dead from in_pcbnotify() to udp_ctlinput() and tcp_ctlinput(), so they will call in_pcbnotifyall() to notify all sessions with the specific remote address. Approved by: jlemon Inspired by: NetBSD
2001-02-22 21:23:45 +00:00
}
When running aplication joined multicast address, removing network card, and kill aplication. imo_membership[].inm_ifp refer interface pointer after removing interface. When kill aplication, release socket,and imo_membership. imo_membership use already not exist interface pointer. Then, kernel panic. PR: 29345 Submitted by: Inoue Yuichi <inoue@nd.net.fujitsu.co.jp> Obtained from: KAME MFC after: 3 days
2001-08-04 17:10:14 +00:00
void
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
When running aplication joined multicast address, removing network card, and kill aplication. imo_membership[].inm_ifp refer interface pointer after removing interface. When kill aplication, release socket,and imo_membership. imo_membership use already not exist interface pointer. Then, kernel panic. PR: 29345 Submitted by: Inoue Yuichi <inoue@nd.net.fujitsu.co.jp> Obtained from: KAME MFC after: 3 days
2001-08-04 17:10:14 +00:00
{
struct inpcb *inp;
struct ip_moptions *imo;
int i, gap;
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_INFO_WLOCK(pcbinfo);
Rename some fields of struct inpcbinfo to have the ipi_ prefix, consistent with the naming of other structure field members, and reducing improper grep matches. Clean up and comment structure fields in structure definition.
2007-04-30 23:12:05 +00:00
LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK(inp);
When running aplication joined multicast address, removing network card, and kill aplication. imo_membership[].inm_ifp refer interface pointer after removing interface. When kill aplication, release socket,and imo_membership. imo_membership use already not exist interface pointer. Then, kernel panic. PR: 29345 Submitted by: Inoue Yuichi <inoue@nd.net.fujitsu.co.jp> Obtained from: KAME MFC after: 3 days
2001-08-04 17:10:14 +00:00
imo = inp->inp_moptions;
if ((inp->inp_vflag & INP_IPV4) &&
imo != NULL) {
/*
* Unselect the outgoing interface if it is being
* detached.
*/
if (imo->imo_multicast_ifp == ifp)
imo->imo_multicast_ifp = NULL;
/*
* Drop multicast group membership if we joined
* through the interface being detached.
*/
for (i = 0, gap = 0; i < imo->imo_num_memberships;
i++) {
if (imo->imo_membership[i]->inm_ifp == ifp) {
in_delmulti(imo->imo_membership[i]);
gap++;
} else if (gap != 0)
imo->imo_membership[i - gap] =
imo->imo_membership[i];
}
imo->imo_num_memberships -= gap;
}
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WUNLOCK(inp);
When running aplication joined multicast address, removing network card, and kill aplication. imo_membership[].inm_ifp refer interface pointer after removing interface. When kill aplication, release socket,and imo_membership. imo_membership use already not exist interface pointer. Then, kernel panic. PR: 29345 Submitted by: Inoue Yuichi <inoue@nd.net.fujitsu.co.jp> Obtained from: KAME MFC after: 3 days
2001-08-04 17:10:14 +00:00
}
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_INFO_WUNLOCK(pcbinfo);
When running aplication joined multicast address, removing network card, and kill aplication. imo_membership[].inm_ifp refer interface pointer after removing interface. When kill aplication, release socket,and imo_membership. imo_membership use already not exist interface pointer. Then, kernel panic. PR: 29345 Submitted by: Inoue Yuichi <inoue@nd.net.fujitsu.co.jp> Obtained from: KAME MFC after: 3 days
2001-08-04 17:10:14 +00:00
}
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
/*
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
* Lookup a PCB based on the local address and port. Caller must hold the
* hash lock. No inpcb locks or references are acquired.
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
*/
Never select the PCB that has INP_IPV6 flag and is bound to :: if we have another PCB which is bound to 0.0.0.0. If a PCB has the INP_IPV6 flag, then we set its cost higher than IPv4 only PCBs. Submitted by: Keiichi SHIMA <keiichi__at__iijlab.net> Obtained from: KAME MFC after: 1 week
2006-02-04 07:59:17 +00:00
#define INP_LOOKUP_MAPPED_PCB_COST 3
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct inpcb *
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
u_short lport, int lookupflags, struct ucred *cred)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
struct inpcb *inp;
Never select the PCB that has INP_IPV6 flag and is bound to :: if we have another PCB which is bound to 0.0.0.0. If a PCB has the INP_IPV6 flag, then we set its cost higher than IPv4 only PCBs. Submitted by: Keiichi SHIMA <keiichi__at__iijlab.net> Obtained from: KAME MFC after: 1 week
2006-02-04 07:59:17 +00:00
#ifdef INET6
int matchwild = 3 + INP_LOOKUP_MAPPED_PCB_COST;
#else
int matchwild = 3;
#endif
int wildcard;
Added splnet protections for PCB list manipulations and traversals.
1995-04-10 08:52:45 +00:00
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_LOCK_ASSERT(pcbinfo);
o reorder some locking asserts to reflect the order of the locks o correct a read-lock assert in in_pcblookup_local that should be a write-lock assert (since time wait close cleanups may alter state) Supported by: FreeBSD Foundation
2003-11-13 05:16:56 +00:00
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
struct inpcbhead *head;
/*
* Look for an unconnected (wildcard foreign addr) PCB that
* matches the local address and port we're looking for.
*/
Rename some fields of struct inpcbinfo to have the ipi_ prefix, consistent with the naming of other structure field members, and reducing improper grep matches. Clean up and comment structure fields in structure definition.
2007-04-30 23:12:05 +00:00
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
0, pcbinfo->ipi_hashmask)];
Mechanical change to use <sys/queue.h> macro API instead of fondling implementation details. Created with: sed(1) Reviewed by: md5(1)
2001-02-04 13:13:25 +00:00
LIST_FOREACH(inp, head, inp_hash) {
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#ifdef INET6
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
/* XXX inp locking */
Change incorrect NULLs to 0s
1999-12-21 11:14:12 +00:00
if ((inp->inp_vflag & INP_IPV4) == 0)
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
continue;
#endif
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
if (inp->inp_faddr.s_addr == INADDR_ANY &&
inp->inp_laddr.s_addr == laddr.s_addr &&
inp->inp_lport == lport) {
/*
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
* Found?
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
*/
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
if (cred == NULL ||
Add hierarchical jails. A jail may further virtualize its environment by creating a child jail, which is visible to that jail and to any parent jails. Child jails may be restricted more than their parents, but never less. Jail names reflect this hierarchy, being MIB-style dot-separated strings. Every thread now points to a jail, the default being prison0, which contains information about the physical system. Prison0's root directory is the same as rootvnode; its hostname is the same as the global hostname, and its securelevel replaces the global securelevel. Note that the variable "securelevel" has actually gone away, which should not cause any problems for code that properly uses securelevel_gt() and securelevel_ge(). Some jail-related permissions that were kept in global variables and set via sysctls are now per-jail settings. The sysctls still exist for backward compatibility, used only by the now-deprecated jail(2) system call. Approved by: bz (mentor)
2009-05-27 14:11:23 +00:00
prison_equal_ip4(cred->cr_prison,
inp->inp_cred->cr_prison))
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
return (inp);
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
}
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
}
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
/*
* Not found.
*/
return (NULL);
} else {
struct inpcbporthead *porthash;
struct inpcbport *phd;
struct inpcb *match = NULL;
/*
* Best fit PCB lookup.
*
* First see if this local port is in use by looking on the
* port hash list.
*/
Rename some fields of struct inpcbinfo to have the ipi_ prefix, consistent with the naming of other structure field members, and reducing improper grep matches. Clean up and comment structure fields in structure definition.
2007-04-30 23:12:05 +00:00
porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
pcbinfo->ipi_porthashmask)];
Mechanical change to use <sys/queue.h> macro API instead of fondling implementation details. Created with: sed(1) Reviewed by: md5(1)
2001-02-04 13:13:25 +00:00
LIST_FOREACH(phd, porthash, phd_hash) {
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
if (phd->phd_port == lport)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
break;
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
}
if (phd != NULL) {
/*
* Port is in use by one or more PCBs. Look for best
* fit.
*/
Another round of the <sys/queue.h> FOREACH transmogriffer. Created with: sed(1) Reviewed by: md5(1)
2001-02-04 16:08:18 +00:00
LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
wildcard = 0;
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
if (cred != NULL &&
Add hierarchical jails. A jail may further virtualize its environment by creating a child jail, which is visible to that jail and to any parent jails. Child jails may be restricted more than their parents, but never less. Jail names reflect this hierarchy, being MIB-style dot-separated strings. Every thread now points to a jail, the default being prison0, which contains information about the physical system. Prison0's root directory is the same as rootvnode; its hostname is the same as the global hostname, and its securelevel replaces the global securelevel. Note that the variable "securelevel" has actually gone away, which should not cause any problems for code that properly uses securelevel_gt() and securelevel_ge(). Some jail-related permissions that were kept in global variables and set via sysctls are now per-jail settings. The sysctls still exist for backward compatibility, used only by the now-deprecated jail(2) system call. Approved by: bz (mentor)
2009-05-27 14:11:23 +00:00
!prison_equal_ip4(inp->inp_cred->cr_prison,
cred->cr_prison))
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
continue;
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#ifdef INET6
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
/* XXX inp locking */
Change incorrect NULLs to 0s
1999-12-21 11:14:12 +00:00
if ((inp->inp_vflag & INP_IPV4) == 0)
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
continue;
Never select the PCB that has INP_IPV6 flag and is bound to :: if we have another PCB which is bound to 0.0.0.0. If a PCB has the INP_IPV6 flag, then we set its cost higher than IPv4 only PCBs. Submitted by: Keiichi SHIMA <keiichi__at__iijlab.net> Obtained from: KAME MFC after: 1 week
2006-02-04 07:59:17 +00:00
/*
* We never select the PCB that has
* INP_IPV6 flag and is bound to :: if
* we have another PCB which is bound
* to 0.0.0.0. If a PCB has the
* INP_IPV6 flag, then we set its cost
* higher than IPv4 only PCBs.
*
* Note that the case only happens
* when a socket is bound to ::, under
* the condition that the use of the
* mapped address is allowed.
*/
if ((inp->inp_vflag & INP_IPV6) != 0)
wildcard += INP_LOOKUP_MAPPED_PCB_COST;
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#endif
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
if (inp->inp_faddr.s_addr != INADDR_ANY)
wildcard++;
if (inp->inp_laddr.s_addr != INADDR_ANY) {
if (laddr.s_addr == INADDR_ANY)
wildcard++;
else if (inp->inp_laddr.s_addr != laddr.s_addr)
continue;
} else {
if (laddr.s_addr != INADDR_ANY)
wildcard++;
}
if (wildcard < matchwild) {
match = inp;
matchwild = wildcard;
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
if (matchwild == 0)
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
break;
}
Move exact match pcb's to the head of the list to improve lookup performance.
1995-03-02 19:29:42 +00:00
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
return (match);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
}
Never select the PCB that has INP_IPV6 flag and is bound to :: if we have another PCB which is bound to 0.0.0.0. If a PCB has the INP_IPV6 flag, then we set its cost higher than IPv4 only PCBs. Submitted by: Keiichi SHIMA <keiichi__at__iijlab.net> Obtained from: KAME MFC after: 1 week
2006-02-04 07:59:17 +00:00
#undef INP_LOOKUP_MAPPED_PCB_COST
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#ifdef PCBGROUP
/*
* Lookup PCB in hash list, using pcbgroup tables.
*/
static struct inpcb *
in_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
struct in_addr faddr, u_int fport_arg, struct in_addr laddr,
u_int lport_arg, int lookupflags, struct ifnet *ifp)
{
struct inpcbhead *head;
struct inpcb *inp, *tmpinp;
u_short fport = fport_arg, lport = lport_arg;
/*
* First look for an exact match.
*/
tmpinp = NULL;
INP_GROUP_LOCK(pcbgroup);
head = &pcbgroup->ipg_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
pcbgroup->ipg_hashmask)];
LIST_FOREACH(inp, head, inp_pcbgrouphash) {
#ifdef INET6
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV4) == 0)
continue;
#endif
if (inp->inp_faddr.s_addr == faddr.s_addr &&
inp->inp_laddr.s_addr == laddr.s_addr &&
inp->inp_fport == fport &&
inp->inp_lport == lport) {
/*
* XXX We should be able to directly return
* the inp here, without any checks.
* Well unless both bound with SO_REUSEPORT?
*/
if (prison_flag(inp->inp_cred, PR_IP4))
goto found;
if (tmpinp == NULL)
tmpinp = inp;
}
}
if (tmpinp != NULL) {
inp = tmpinp;
goto found;
}
Implement the first stage of multi-bind listen sockets and RSS socket awareness. * Introduce IP_BINDMULTI - indicating that it's okay to bind multiple sockets on the same bind details. Although the PCB code has been taught about this (see below) this patch doesn't introduce the rest of the PCB changes necessary to distribute lookups among multiple PCB entries in the global wildcard table. * Introduce IP_RSS_LISTEN_BUCKET - placing an listen socket into the given RSS bucket (and thus a single PCBGROUP hash.) * Modify the PCB add path to be aware of IP_BINDMULTI: + Only allow further PCB entries to be added if the owner credentials and IP_BINDMULTI has been specified. Ie, only allow further IP_BINDMULTI sockets to appear if the first bind() was IP_BINDMULTI. * Teach the PCBGROUP code about IP_RSS_LISTE_BUCKET marked PCB entries. Instead of using the wildcard logic and hashing, these sockets are simply placed into the PCBGROUP and _not_ in the wildcard hash. * When doing a PCBGROUP lookup, also do a wildcard match as well. This allows for an RSS bucket PCB entry to appear in a PCBGROUP rather than having to exist in the wildcard list. Tested: * TCP IPv4 server testing with igb(4) * TCP IPv4 server testing with ix(4) TODO: * The pcbgroup lookup code duplicated the wildcard and wildcard-PCB logic. This could be refactored into a single function. * This doesn't yet work for IPv6 (The PCBGROUP code in netinet6/ doesn't yet know about this); nor does it yet fully work for UDP.
2014-07-10 03:10:56 +00:00
#ifdef RSS
/*
* For incoming connections, we may wish to do a wildcard
* match for an RSS-local socket.
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
struct inpcb *local_wild = NULL, *local_exact = NULL;
#ifdef INET6
struct inpcb *local_wild_mapped = NULL;
#endif
struct inpcb *jail_wild = NULL;
struct inpcbhead *head;
int injail;
/*
* Order of socket selection - we always prefer jails.
* 1. jailed, non-wild.
* 2. jailed, wild.
* 3. non-jailed, non-wild.
* 4. non-jailed, wild.
*/
head = &pcbgroup->ipg_hashbase[INP_PCBHASH(INADDR_ANY,
lport, 0, pcbgroup->ipg_hashmask)];
LIST_FOREACH(inp, head, inp_pcbgrouphash) {
#ifdef INET6
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV4) == 0)
continue;
#endif
if (inp->inp_faddr.s_addr != INADDR_ANY ||
inp->inp_lport != lport)
continue;
injail = prison_flag(inp->inp_cred, PR_IP4);
if (injail) {
if (prison_check_ip4(inp->inp_cred,
&laddr) != 0)
continue;
} else {
if (local_exact != NULL)
continue;
}
if (inp->inp_laddr.s_addr == laddr.s_addr) {
if (injail)
goto found;
else
local_exact = inp;
} else if (inp->inp_laddr.s_addr == INADDR_ANY) {
#ifdef INET6
/* XXX inp locking, NULL check */
if (inp->inp_vflag & INP_IPV6PROTO)
local_wild_mapped = inp;
else
#endif
if (injail)
jail_wild = inp;
else
local_wild = inp;
}
} /* LIST_FOREACH */
inp = jail_wild;
if (inp == NULL)
inp = local_exact;
if (inp == NULL)
inp = local_wild;
#ifdef INET6
if (inp == NULL)
inp = local_wild_mapped;
#endif
if (inp != NULL)
goto found;
}
#endif
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
/*
* Then look for a wildcard match, if requested.
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
struct inpcb *local_wild = NULL, *local_exact = NULL;
#ifdef INET6
struct inpcb *local_wild_mapped = NULL;
#endif
struct inpcb *jail_wild = NULL;
struct inpcbhead *head;
int injail;
/*
* Order of socket selection - we always prefer jails.
* 1. jailed, non-wild.
* 2. jailed, wild.
* 3. non-jailed, non-wild.
* 4. non-jailed, wild.
*/
head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
0, pcbinfo->ipi_wildmask)];
LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
#ifdef INET6
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV4) == 0)
continue;
#endif
if (inp->inp_faddr.s_addr != INADDR_ANY ||
inp->inp_lport != lport)
continue;
injail = prison_flag(inp->inp_cred, PR_IP4);
if (injail) {
if (prison_check_ip4(inp->inp_cred,
&laddr) != 0)
continue;
} else {
if (local_exact != NULL)
continue;
}
if (inp->inp_laddr.s_addr == laddr.s_addr) {
if (injail)
goto found;
else
local_exact = inp;
} else if (inp->inp_laddr.s_addr == INADDR_ANY) {
#ifdef INET6
/* XXX inp locking, NULL check */
if (inp->inp_vflag & INP_IPV6PROTO)
local_wild_mapped = inp;
else
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
if (injail)
jail_wild = inp;
else
local_wild = inp;
}
} /* LIST_FOREACH */
inp = jail_wild;
if (inp == NULL)
inp = local_exact;
if (inp == NULL)
inp = local_wild;
#ifdef INET6
if (inp == NULL)
inp = local_wild_mapped;
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
if (inp != NULL)
goto found;
} /* if (lookupflags & INPLOOKUP_WILDCARD) */
INP_GROUP_UNLOCK(pcbgroup);
return (NULL);
found:
in_pcbref(inp);
INP_GROUP_UNLOCK(pcbgroup);
if (lookupflags & INPLOOKUP_WLOCKPCB) {
INP_WLOCK(inp);
if (in_pcbrele_wlocked(inp))
return (NULL);
} else if (lookupflags & INPLOOKUP_RLOCKPCB) {
INP_RLOCK(inp);
if (in_pcbrele_rlocked(inp))
return (NULL);
} else
panic("%s: locking bug", __func__);
return (inp);
}
#endif /* PCBGROUP */
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
/*
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
* Lookup PCB in hash list, using pcbinfo tables. This variation assumes
* that the caller has locked the hash list, and will not perform any further
* locking or reference operations on either the hash list or the connection.
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
*/
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
static struct inpcb *
in_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in_addr faddr,
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
u_int fport_arg, struct in_addr laddr, u_int lport_arg, int lookupflags,
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
struct ifnet *ifp)
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
{
struct inpcbhead *head;
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
struct inpcb *inp, *tmpinp;
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
u_short fport = fport_arg, lport = lport_arg;
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_LOCK_ASSERT(pcbinfo);
Assert the inpcb lock when rehashing an inpcb. Improve consistency of style around some current assertions. MFC after: 3 months
2006-04-22 19:15:20 +00:00
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
/*
* First look for an exact match.
*/
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
tmpinp = NULL;
Rename some fields of struct inpcbinfo to have the ipi_ prefix, consistent with the naming of other structure field members, and reducing improper grep matches. Clean up and comment structure fields in structure definition.
2007-04-30 23:12:05 +00:00
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr.s_addr, lport, fport,
pcbinfo->ipi_hashmask)];
Mechanical change to use <sys/queue.h> macro API instead of fondling implementation details. Created with: sed(1) Reviewed by: md5(1)
2001-02-04 13:13:25 +00:00
LIST_FOREACH(inp, head, inp_hash) {
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#ifdef INET6
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
/* XXX inp locking */
Change incorrect NULLs to 0s
1999-12-21 11:14:12 +00:00
if ((inp->inp_vflag & INP_IPV4) == 0)
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
continue;
#endif
Improved in_pcblookuphash() to support wildcarding, and changed relavent callers of it to take advantage of this. This reduces new connection request overhead in the face of a large number of PCBs in the system. Thanks to David Filo <filo@yahoo.com> for suggesting this and providing a sample implementation (which wasn't used, but showed that it could be done). Reviewed by: wollman
1996-10-07 19:06:12 +00:00
if (inp->inp_faddr.s_addr == faddr.s_addr &&
Reorganize elements of the inpcb struct to take better advantage of cache lines. Removed the struct ip proto since only a couple of chars were actually being used in it. Changed the order of compares in the PCB hash lookup to take advantage of partial cache line fills (on PPro). Discussed-with: wollman
1997-04-03 05:14:45 +00:00
inp->inp_laddr.s_addr == laddr.s_addr &&
inp->inp_fport == fport &&
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
inp->inp_lport == lport) {
/*
* XXX We should be able to directly return
* the inp here, without any checks.
* Well unless both bound with SO_REUSEPORT?
*/
Add hierarchical jails. A jail may further virtualize its environment by creating a child jail, which is visible to that jail and to any parent jails. Child jails may be restricted more than their parents, but never less. Jail names reflect this hierarchy, being MIB-style dot-separated strings. Every thread now points to a jail, the default being prison0, which contains information about the physical system. Prison0's root directory is the same as rootvnode; its hostname is the same as the global hostname, and its securelevel replaces the global securelevel. Note that the variable "securelevel" has actually gone away, which should not cause any problems for code that properly uses securelevel_gt() and securelevel_ge(). Some jail-related permissions that were kept in global variables and set via sysctls are now per-jail settings. The sysctls still exist for backward compatibility, used only by the now-deprecated jail(2) system call. Approved by: bz (mentor)
2009-05-27 14:11:23 +00:00
if (prison_flag(inp->inp_cred, PR_IP4))
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
return (inp);
if (tmpinp == NULL)
tmpinp = inp;
}
Improved in_pcblookuphash() to support wildcarding, and changed relavent callers of it to take advantage of this. This reduces new connection request overhead in the face of a large number of PCBs in the system. Thanks to David Filo <filo@yahoo.com> for suggesting this and providing a sample implementation (which wasn't used, but showed that it could be done). Reviewed by: wollman
1996-10-07 19:06:12 +00:00
}
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
if (tmpinp != NULL)
return (tmpinp);
Consistently use #ifdef INET6 rather than mixing and matching with #if defined(INET6). Don't comment the end of short #ifdef blocks. Comment cleanup. Line wrap.
2006-11-30 10:54:54 +00:00
/*
* Then look for a wildcard match, if requested.
*/
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
struct inpcb *local_wild = NULL, *local_exact = NULL;
Consistently use #ifdef INET6 rather than mixing and matching with #if defined(INET6). Don't comment the end of short #ifdef blocks. Comment cleanup. Line wrap.
2006-11-30 10:54:54 +00:00
#ifdef INET6
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
struct inpcb *local_wild_mapped = NULL;
Consistently use #ifdef INET6 rather than mixing and matching with #if defined(INET6). Don't comment the end of short #ifdef blocks. Comment cleanup. Line wrap.
2006-11-30 10:54:54 +00:00
#endif
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
struct inpcb *jail_wild = NULL;
int injail;
/*
* Order of socket selection - we always prefer jails.
* 1. jailed, non-wild.
* 2. jailed, wild.
* 3. non-jailed, non-wild.
* 4. non-jailed, wild.
*/
Improved in_pcblookuphash() to support wildcarding, and changed relavent callers of it to take advantage of this. This reduces new connection request overhead in the face of a large number of PCBs in the system. Thanks to David Filo <filo@yahoo.com> for suggesting this and providing a sample implementation (which wasn't used, but showed that it could be done). Reviewed by: wollman
1996-10-07 19:06:12 +00:00
Rename some fields of struct inpcbinfo to have the ipi_ prefix, consistent with the naming of other structure field members, and reducing improper grep matches. Clean up and comment structure fields in structure definition.
2007-04-30 23:12:05 +00:00
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
0, pcbinfo->ipi_hashmask)];
Mechanical change to use <sys/queue.h> macro API instead of fondling implementation details. Created with: sed(1) Reviewed by: md5(1)
2001-02-04 13:13:25 +00:00
LIST_FOREACH(inp, head, inp_hash) {
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#ifdef INET6
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
/* XXX inp locking */
Change incorrect NULLs to 0s
1999-12-21 11:14:12 +00:00
if ((inp->inp_vflag & INP_IPV4) == 0)
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
continue;
#endif
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
if (inp->inp_faddr.s_addr != INADDR_ANY ||
inp->inp_lport != lport)
continue;
Add hierarchical jails. A jail may further virtualize its environment by creating a child jail, which is visible to that jail and to any parent jails. Child jails may be restricted more than their parents, but never less. Jail names reflect this hierarchy, being MIB-style dot-separated strings. Every thread now points to a jail, the default being prison0, which contains information about the physical system. Prison0's root directory is the same as rootvnode; its hostname is the same as the global hostname, and its securelevel replaces the global securelevel. Note that the variable "securelevel" has actually gone away, which should not cause any problems for code that properly uses securelevel_gt() and securelevel_ge(). Some jail-related permissions that were kept in global variables and set via sysctls are now per-jail settings. The sysctls still exist for backward compatibility, used only by the now-deprecated jail(2) system call. Approved by: bz (mentor)
2009-05-27 14:11:23 +00:00
injail = prison_flag(inp->inp_cred, PR_IP4);
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
if (injail) {
Standardize the various prison_foo_ip[46] functions and prison_if to return zero on success and an error code otherwise. The possible errors are EADDRNOTAVAIL if an address being checked for doesn't match the prison, and EAFNOSUPPORT if the prison doesn't have any addresses in that address family. For most callers of these functions, use the returned error code instead of e.g. a hard-coded EADDRNOTAVAIL or EINVAL. Always include a jailed() check in these functions, where a non-jailed cred always returns success (and makes no changes). Remove the explicit jailed() checks that preceded many of the function calls. Approved by: bz (mentor)
2009-02-05 14:06:09 +00:00
if (prison_check_ip4(inp->inp_cred,
&laddr) != 0)
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
continue;
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
} else {
if (local_exact != NULL)
continue;
}
if (inp->inp_laddr.s_addr == laddr.s_addr) {
if (injail)
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
return (inp);
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
else
local_exact = inp;
} else if (inp->inp_laddr.s_addr == INADDR_ANY) {
Consistently use #ifdef INET6 rather than mixing and matching with #if defined(INET6). Don't comment the end of short #ifdef blocks. Comment cleanup. Line wrap.
2006-11-30 10:54:54 +00:00
#ifdef INET6
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
/* XXX inp locking, NULL check */
if (inp->inp_vflag & INP_IPV6PROTO)
local_wild_mapped = inp;
else
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
if (injail)
jail_wild = inp;
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
else
Consistently use #ifdef INET6 rather than mixing and matching with #if defined(INET6). Don't comment the end of short #ifdef blocks. Comment cleanup. Line wrap.
2006-11-30 10:54:54 +00:00
local_wild = inp;
Improved in_pcblookuphash() to support wildcarding, and changed relavent callers of it to take advantage of this. This reduces new connection request overhead in the face of a large number of PCBs in the system. Thanks to David Filo <filo@yahoo.com> for suggesting this and providing a sample implementation (which wasn't used, but showed that it could be done). Reviewed by: wollman
1996-10-07 19:06:12 +00:00
}
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
} /* LIST_FOREACH */
if (jail_wild != NULL)
return (jail_wild);
if (local_exact != NULL)
return (local_exact);
if (local_wild != NULL)
return (local_wild);
Consistently use #ifdef INET6 rather than mixing and matching with #if defined(INET6). Don't comment the end of short #ifdef blocks. Comment cleanup. Line wrap.
2006-11-30 10:54:54 +00:00
#ifdef INET6
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
if (local_wild_mapped != NULL)
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
return (local_wild_mapped);
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif
Move from passing a wildcard boolean to a general set up lookup flags into in_pcb_lport(), in_pcblookup_local(), and in_pcblookup_hash(), and similarly for IPv6 functions. In the future, we would like to support other flags relating to locking strategy. This change doesn't appear to modify the KBI in practice, as callers already passed in INPLOOKUP_WILDCARD rather than a simple boolean. MFC after: 3 weeks Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-23 15:23:18 +00:00
} /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
MFp4: Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
2008-11-29 14:32:14 +00:00
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
return (NULL);
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
}
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
/*
* Lookup PCB in hash list, using pcbinfo tables. This variation locks the
* hash list lock, and will return the inpcb locked (i.e., requires
* INPLOOKUP_LOCKPCB).
*/
static struct inpcb *
in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr,
u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
struct ifnet *ifp)
{
struct inpcb *inp;
INP_HASH_RLOCK(pcbinfo);
inp = in_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
(lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
if (inp != NULL) {
in_pcbref(inp);
INP_HASH_RUNLOCK(pcbinfo);
if (lookupflags & INPLOOKUP_WLOCKPCB) {
INP_WLOCK(inp);
if (in_pcbrele_wlocked(inp))
return (NULL);
} else if (lookupflags & INPLOOKUP_RLOCKPCB) {
INP_RLOCK(inp);
if (in_pcbrele_rlocked(inp))
return (NULL);
} else
panic("%s: locking bug", __func__);
} else
INP_HASH_RUNLOCK(pcbinfo);
return (inp);
}
/*
Add _mbuf() variants of various inpcb-related interfaces, including lookup, hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-04 16:33:06 +00:00
* Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
* from which a pre-calculated hash value may be extracted.
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
*
* Possibly more of this logic should be in in_pcbgroup.c.
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
*/
struct inpcb *
in_pcblookup(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport,
struct in_addr laddr, u_int lport, int lookupflags, struct ifnet *ifp)
{
Several years after initial development, merge prototype support for linking NIC Receive Side Scaling (RSS) to the network stack's connection-group implementation. This prototype (and derived patches) are in use at Juniper and several other FreeBSD-using companies, so despite some reservations about its maturity, merge the patch to the base tree so that it can be iteratively refined in collaboration rather than maintained as a set of gradually diverging patch sets. (1) Merge a software implementation of the Toeplitz hash specified in RSS implemented by David Malone. This is used to allow suitable pcbgroup placement of connections before the first packet is received from the NIC. Software hashing is generally avoided, however, due to high cost of the hash on general-purpose CPUs. (2) In in_rss.c, maintain authoritative versions of RSS state intended to be pushed to each NIC, including keying material, hash algorithm/ configuration, and buckets. Provide software-facing interfaces to hash 2- and 4-tuples for IPv4 and IPv6 using both the RSS standardised Toeplitz and a 'naive' variation with a hash efficient in software but with poor distribution properties. Implement rss_m2cpuid()to be used by netisr and other load balancing code to look up the CPU on which an mbuf should be processed. (3) In the Ethernet link layer, allow netisr distribution using RSS as a source of policy as an alternative to source ordering; continue to default to direct dispatch (i.e., don't try and requeue packets for processing on the 'right' CPU if they arrive in a directly dispatchable context). (4) Allow RSS to control tuning of connection groups in order to align groups with RSS buckets. If a packet arrives on a protocol using connection groups, and contains a suitable hardware-generated hash, use that hash value to select the connection group for pcb lookup for both IPv4 and IPv6. If no hardware-generated Toeplitz hash is available, we fall back on regular PCB lookup risking contention rather than pay the cost of Toeplitz in software -- this is a less scalable but, at my last measurement, faster approach. As core counts go up, we may want to revise this strategy despite CPU overhead. Where device drivers suitably configure NICs, and connection groups / RSS are enabled, this should avoid both lock and line contention during connection lookup for TCP. This commit does not modify any device drivers to tune device RSS configuration to the global RSS configuration; patches are in circulation to do this for at least Chelsio T3 and Intel 1G/10G drivers. Currently, the KPI for device drivers is not particularly robust, nor aware of more advanced features such as runtime reconfiguration/rebalancing. This will hopefully prove a useful starting point for refinement. No MFC is scheduled as we will first want to nail down a more mature and maintainable KPI/KBI for device drivers. Sponsored by: Juniper Networks (original work) Sponsored by: EMC/Isilon (patch update and merge)
2014-03-15 00:57:50 +00:00
#if defined(PCBGROUP) && !defined(RSS)
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
struct inpcbgroup *pcbgroup;
#endif
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
("%s: LOCKPCB not set", __func__));
Several years after initial development, merge prototype support for linking NIC Receive Side Scaling (RSS) to the network stack's connection-group implementation. This prototype (and derived patches) are in use at Juniper and several other FreeBSD-using companies, so despite some reservations about its maturity, merge the patch to the base tree so that it can be iteratively refined in collaboration rather than maintained as a set of gradually diverging patch sets. (1) Merge a software implementation of the Toeplitz hash specified in RSS implemented by David Malone. This is used to allow suitable pcbgroup placement of connections before the first packet is received from the NIC. Software hashing is generally avoided, however, due to high cost of the hash on general-purpose CPUs. (2) In in_rss.c, maintain authoritative versions of RSS state intended to be pushed to each NIC, including keying material, hash algorithm/ configuration, and buckets. Provide software-facing interfaces to hash 2- and 4-tuples for IPv4 and IPv6 using both the RSS standardised Toeplitz and a 'naive' variation with a hash efficient in software but with poor distribution properties. Implement rss_m2cpuid()to be used by netisr and other load balancing code to look up the CPU on which an mbuf should be processed. (3) In the Ethernet link layer, allow netisr distribution using RSS as a source of policy as an alternative to source ordering; continue to default to direct dispatch (i.e., don't try and requeue packets for processing on the 'right' CPU if they arrive in a directly dispatchable context). (4) Allow RSS to control tuning of connection groups in order to align groups with RSS buckets. If a packet arrives on a protocol using connection groups, and contains a suitable hardware-generated hash, use that hash value to select the connection group for pcb lookup for both IPv4 and IPv6. If no hardware-generated Toeplitz hash is available, we fall back on regular PCB lookup risking contention rather than pay the cost of Toeplitz in software -- this is a less scalable but, at my last measurement, faster approach. As core counts go up, we may want to revise this strategy despite CPU overhead. Where device drivers suitably configure NICs, and connection groups / RSS are enabled, this should avoid both lock and line contention during connection lookup for TCP. This commit does not modify any device drivers to tune device RSS configuration to the global RSS configuration; patches are in circulation to do this for at least Chelsio T3 and Intel 1G/10G drivers. Currently, the KPI for device drivers is not particularly robust, nor aware of more advanced features such as runtime reconfiguration/rebalancing. This will hopefully prove a useful starting point for refinement. No MFC is scheduled as we will first want to nail down a more mature and maintainable KPI/KBI for device drivers. Sponsored by: Juniper Networks (original work) Sponsored by: EMC/Isilon (patch update and merge)
2014-03-15 00:57:50 +00:00
/*
* When not using RSS, use connection groups in preference to the
* reservation table when looking up 4-tuples. When using RSS, just
* use the reservation table, due to the cost of the Toeplitz hash
* in software.
*
* XXXRW: This policy belongs in the pcbgroup code, as in principle
* we could be doing RSS with a non-Toeplitz hash that is affordable
* in software.
*/
#if defined(PCBGROUP) && !defined(RSS)
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
if (in_pcbgroup_enabled(pcbinfo)) {
pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
fport);
return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
laddr, lport, lookupflags, ifp));
}
#endif
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
lookupflags, ifp));
}
Add _mbuf() variants of various inpcb-related interfaces, including lookup, hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-04 16:33:06 +00:00
struct inpcb *
in_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in_addr faddr,
u_int fport, struct in_addr laddr, u_int lport, int lookupflags,
struct ifnet *ifp, struct mbuf *m)
{
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#ifdef PCBGROUP
struct inpcbgroup *pcbgroup;
#endif
Add _mbuf() variants of various inpcb-related interfaces, including lookup, hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-04 16:33:06 +00:00
KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
("%s: LOCKPCB not set", __func__));
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#ifdef PCBGROUP
Several years after initial development, merge prototype support for linking NIC Receive Side Scaling (RSS) to the network stack's connection-group implementation. This prototype (and derived patches) are in use at Juniper and several other FreeBSD-using companies, so despite some reservations about its maturity, merge the patch to the base tree so that it can be iteratively refined in collaboration rather than maintained as a set of gradually diverging patch sets. (1) Merge a software implementation of the Toeplitz hash specified in RSS implemented by David Malone. This is used to allow suitable pcbgroup placement of connections before the first packet is received from the NIC. Software hashing is generally avoided, however, due to high cost of the hash on general-purpose CPUs. (2) In in_rss.c, maintain authoritative versions of RSS state intended to be pushed to each NIC, including keying material, hash algorithm/ configuration, and buckets. Provide software-facing interfaces to hash 2- and 4-tuples for IPv4 and IPv6 using both the RSS standardised Toeplitz and a 'naive' variation with a hash efficient in software but with poor distribution properties. Implement rss_m2cpuid()to be used by netisr and other load balancing code to look up the CPU on which an mbuf should be processed. (3) In the Ethernet link layer, allow netisr distribution using RSS as a source of policy as an alternative to source ordering; continue to default to direct dispatch (i.e., don't try and requeue packets for processing on the 'right' CPU if they arrive in a directly dispatchable context). (4) Allow RSS to control tuning of connection groups in order to align groups with RSS buckets. If a packet arrives on a protocol using connection groups, and contains a suitable hardware-generated hash, use that hash value to select the connection group for pcb lookup for both IPv4 and IPv6. If no hardware-generated Toeplitz hash is available, we fall back on regular PCB lookup risking contention rather than pay the cost of Toeplitz in software -- this is a less scalable but, at my last measurement, faster approach. As core counts go up, we may want to revise this strategy despite CPU overhead. Where device drivers suitably configure NICs, and connection groups / RSS are enabled, this should avoid both lock and line contention during connection lookup for TCP. This commit does not modify any device drivers to tune device RSS configuration to the global RSS configuration; patches are in circulation to do this for at least Chelsio T3 and Intel 1G/10G drivers. Currently, the KPI for device drivers is not particularly robust, nor aware of more advanced features such as runtime reconfiguration/rebalancing. This will hopefully prove a useful starting point for refinement. No MFC is scheduled as we will first want to nail down a more mature and maintainable KPI/KBI for device drivers. Sponsored by: Juniper Networks (original work) Sponsored by: EMC/Isilon (patch update and merge)
2014-03-15 00:57:50 +00:00
/*
* If we can use a hardware-generated hash to look up the connection
* group, use that connection group to find the inpcb. Otherwise
* fall back on a software hash -- or the reservation table if we're
* using RSS.
*
* XXXRW: As above, that policy belongs in the pcbgroup code.
*/
if (in_pcbgroup_enabled(pcbinfo) &&
!(M_HASHTYPE_TEST(m, M_HASHTYPE_NONE))) {
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
pcbgroup = in_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
m->m_pkthdr.flowid);
if (pcbgroup != NULL)
return (in_pcblookup_group(pcbinfo, pcbgroup, faddr,
fport, laddr, lport, lookupflags, ifp));
Several years after initial development, merge prototype support for linking NIC Receive Side Scaling (RSS) to the network stack's connection-group implementation. This prototype (and derived patches) are in use at Juniper and several other FreeBSD-using companies, so despite some reservations about its maturity, merge the patch to the base tree so that it can be iteratively refined in collaboration rather than maintained as a set of gradually diverging patch sets. (1) Merge a software implementation of the Toeplitz hash specified in RSS implemented by David Malone. This is used to allow suitable pcbgroup placement of connections before the first packet is received from the NIC. Software hashing is generally avoided, however, due to high cost of the hash on general-purpose CPUs. (2) In in_rss.c, maintain authoritative versions of RSS state intended to be pushed to each NIC, including keying material, hash algorithm/ configuration, and buckets. Provide software-facing interfaces to hash 2- and 4-tuples for IPv4 and IPv6 using both the RSS standardised Toeplitz and a 'naive' variation with a hash efficient in software but with poor distribution properties. Implement rss_m2cpuid()to be used by netisr and other load balancing code to look up the CPU on which an mbuf should be processed. (3) In the Ethernet link layer, allow netisr distribution using RSS as a source of policy as an alternative to source ordering; continue to default to direct dispatch (i.e., don't try and requeue packets for processing on the 'right' CPU if they arrive in a directly dispatchable context). (4) Allow RSS to control tuning of connection groups in order to align groups with RSS buckets. If a packet arrives on a protocol using connection groups, and contains a suitable hardware-generated hash, use that hash value to select the connection group for pcb lookup for both IPv4 and IPv6. If no hardware-generated Toeplitz hash is available, we fall back on regular PCB lookup risking contention rather than pay the cost of Toeplitz in software -- this is a less scalable but, at my last measurement, faster approach. As core counts go up, we may want to revise this strategy despite CPU overhead. Where device drivers suitably configure NICs, and connection groups / RSS are enabled, this should avoid both lock and line contention during connection lookup for TCP. This commit does not modify any device drivers to tune device RSS configuration to the global RSS configuration; patches are in circulation to do this for at least Chelsio T3 and Intel 1G/10G drivers. Currently, the KPI for device drivers is not particularly robust, nor aware of more advanced features such as runtime reconfiguration/rebalancing. This will hopefully prove a useful starting point for refinement. No MFC is scheduled as we will first want to nail down a more mature and maintainable KPI/KBI for device drivers. Sponsored by: Juniper Networks (original work) Sponsored by: EMC/Isilon (patch update and merge)
2014-03-15 00:57:50 +00:00
#ifndef RSS
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
pcbgroup = in_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
fport);
return (in_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
laddr, lport, lookupflags, ifp));
Several years after initial development, merge prototype support for linking NIC Receive Side Scaling (RSS) to the network stack's connection-group implementation. This prototype (and derived patches) are in use at Juniper and several other FreeBSD-using companies, so despite some reservations about its maturity, merge the patch to the base tree so that it can be iteratively refined in collaboration rather than maintained as a set of gradually diverging patch sets. (1) Merge a software implementation of the Toeplitz hash specified in RSS implemented by David Malone. This is used to allow suitable pcbgroup placement of connections before the first packet is received from the NIC. Software hashing is generally avoided, however, due to high cost of the hash on general-purpose CPUs. (2) In in_rss.c, maintain authoritative versions of RSS state intended to be pushed to each NIC, including keying material, hash algorithm/ configuration, and buckets. Provide software-facing interfaces to hash 2- and 4-tuples for IPv4 and IPv6 using both the RSS standardised Toeplitz and a 'naive' variation with a hash efficient in software but with poor distribution properties. Implement rss_m2cpuid()to be used by netisr and other load balancing code to look up the CPU on which an mbuf should be processed. (3) In the Ethernet link layer, allow netisr distribution using RSS as a source of policy as an alternative to source ordering; continue to default to direct dispatch (i.e., don't try and requeue packets for processing on the 'right' CPU if they arrive in a directly dispatchable context). (4) Allow RSS to control tuning of connection groups in order to align groups with RSS buckets. If a packet arrives on a protocol using connection groups, and contains a suitable hardware-generated hash, use that hash value to select the connection group for pcb lookup for both IPv4 and IPv6. If no hardware-generated Toeplitz hash is available, we fall back on regular PCB lookup risking contention rather than pay the cost of Toeplitz in software -- this is a less scalable but, at my last measurement, faster approach. As core counts go up, we may want to revise this strategy despite CPU overhead. Where device drivers suitably configure NICs, and connection groups / RSS are enabled, this should avoid both lock and line contention during connection lookup for TCP. This commit does not modify any device drivers to tune device RSS configuration to the global RSS configuration; patches are in circulation to do this for at least Chelsio T3 and Intel 1G/10G drivers. Currently, the KPI for device drivers is not particularly robust, nor aware of more advanced features such as runtime reconfiguration/rebalancing. This will hopefully prove a useful starting point for refinement. No MFC is scheduled as we will first want to nail down a more mature and maintainable KPI/KBI for device drivers. Sponsored by: Juniper Networks (original work) Sponsored by: EMC/Isilon (patch update and merge)
2014-03-15 00:57:50 +00:00
#endif
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
}
#endif
Add _mbuf() variants of various inpcb-related interfaces, including lookup, hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-04 16:33:06 +00:00
return (in_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
lookupflags, ifp));
}
Make the PCB code compile without INET support by adding #ifdef INETs and correcting few #includes. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-30 11:04:34 +00:00
#endif /* INET */
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
Added splnet protections for PCB list manipulations and traversals.
1995-04-10 08:52:45 +00:00
/*
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
* Insert PCB onto various hash lists.
Added splnet protections for PCB list manipulations and traversals.
1995-04-10 08:52:45 +00:00
*/
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
static int
in_pcbinshash_internal(struct inpcb *inp, int do_pcbgroup_update)
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
{
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
struct inpcbhead *pcbhash;
struct inpcbporthead *pcbporthash;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
struct inpcbport *phd;
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
u_int32_t hashkey_faddr;
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK_ASSERT(inp);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_WLOCK_ASSERT(pcbinfo);
Add INP_INHASHLIST flag for inpcb->inp_flags to indicate whether or not the inpcb is currenty on various hash lookup lists, rather than using (lport != 0) to detect this. This means that the full 4-tuple of a connection can be retained after close, which should lead to more sensible netstat output in the window between TCP close and socket close. MFC after: 2 weeks
2009-03-11 00:29:22 +00:00
KASSERT((inp->inp_flags & INP_INHASHLIST) == 0,
("in_pcbinshash: INP_INHASHLIST"));
Assert the inpcb lock when rehashing an inpcb. Improve consistency of style around some current assertions. MFC after: 3 months
2006-04-22 19:15:20 +00:00
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#ifdef INET6
if (inp->inp_vflag & INP_IPV6)
Introduce INP6_PCBHASHKEY macro. Replace usage of hardcoded part of IPv6 address as hash key in all places. Obtained from: Yandex LLC
2014-09-10 12:35:42 +00:00
hashkey_faddr = INP6_PCBHASHKEY(&inp->in6p_faddr);
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
else
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
hashkey_faddr = inp->inp_faddr.s_addr;
Rename some fields of struct inpcbinfo to have the ipi_ prefix, consistent with the naming of other structure field members, and reducing improper grep matches. Clean up and comment structure fields in structure definition.
2007-04-30 23:12:05 +00:00
pcbhash = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
Rename some fields of struct inpcbinfo to have the ipi_ prefix, consistent with the naming of other structure field members, and reducing improper grep matches. Clean up and comment structure fields in structure definition.
2007-04-30 23:12:05 +00:00
pcbporthash = &pcbinfo->ipi_porthashbase[
INP_PCBPORTHASH(inp->inp_lport, pcbinfo->ipi_porthashmask)];
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
/*
* Go through port list and look for a head for this lport.
*/
Mechanical change to use <sys/queue.h> macro API instead of fondling implementation details. Created with: sed(1) Reviewed by: md5(1)
2001-02-04 13:13:25 +00:00
LIST_FOREACH(phd, pcbporthash, phd_hash) {
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
if (phd->phd_port == inp->inp_lport)
break;
}
/*
* If none exists, malloc one and tack it on.
*/
if (phd == NULL) {
Retire the MALLOC and FREE macros. They are an abomination unto style(9). MFC after: 3 months
2008-10-23 15:53:51 +00:00
phd = malloc(sizeof(struct inpcbport), M_PCB, M_NOWAIT);
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
if (phd == NULL) {
return (ENOBUFS); /* XXX */
}
phd->phd_port = inp->inp_lport;
LIST_INIT(&phd->phd_pcblist);
LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
}
inp->inp_phd = phd;
LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
Add INP_INHASHLIST flag for inpcb->inp_flags to indicate whether or not the inpcb is currenty on various hash lookup lists, rather than using (lport != 0) to detect this. This means that the full 4-tuple of a connection can be retained after close, which should lead to more sensible netstat output in the window between TCP close and socket close. MFC after: 2 weeks
2009-03-11 00:29:22 +00:00
inp->inp_flags |= INP_INHASHLIST;
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#ifdef PCBGROUP
if (do_pcbgroup_update)
in_pcbgroup_update(inp);
#endif
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
return (0);
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
}
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
/*
* For now, there are two public interfaces to insert an inpcb into the hash
* lists -- one that does update pcbgroups, and one that doesn't. The latter
* is used only in the TCP syncache, where in_pcbinshash is called before the
* full 4-tuple is set for the inpcb, and we don't want to install in the
* pcbgroup until later.
*
* XXXRW: This seems like a misfeature. in_pcbinshash should always update
* connection groups, and partially initialised inpcbs should not be exposed
* to either reservation hash tables or pcbgroups.
*/
int
in_pcbinshash(struct inpcb *inp)
{
return (in_pcbinshash_internal(inp, 1));
}
int
in_pcbinshash_nopcbgroup(struct inpcb *inp)
{
return (in_pcbinshash_internal(inp, 0));
}
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
/*
* Move PCB to the proper hash bucket when { faddr, fport } have been
* changed. NOTE: This does not handle the case of the lport changing (the
* hashed port list would have to be updated as well), so the lport must
* not change after in_pcbinshash() has been called.
*/
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
void
Add _mbuf() variants of various inpcb-related interfaces, including lookup, hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-04 16:33:06 +00:00
in_pcbrehash_mbuf(struct inpcb *inp, struct mbuf *m)
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
{
add locking assertions Supported by: FreeBSD Foundation
2003-11-08 23:02:36 +00:00
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
struct inpcbhead *head;
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
u_int32_t hashkey_faddr;
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK_ASSERT(inp);
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_WLOCK_ASSERT(pcbinfo);
Add INP_INHASHLIST flag for inpcb->inp_flags to indicate whether or not the inpcb is currenty on various hash lookup lists, rather than using (lport != 0) to detect this. This means that the full 4-tuple of a connection can be retained after close, which should lead to more sensible netstat output in the window between TCP close and socket close. MFC after: 2 weeks
2009-03-11 00:29:22 +00:00
KASSERT(inp->inp_flags & INP_INHASHLIST,
("in_pcbrehash: !INP_INHASHLIST"));
Assert the inpcb lock when rehashing an inpcb. Improve consistency of style around some current assertions. MFC after: 3 months
2006-04-22 19:15:20 +00:00
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
#ifdef INET6
if (inp->inp_vflag & INP_IPV6)
Introduce INP6_PCBHASHKEY macro. Replace usage of hardcoded part of IPv6 address as hash key in all places. Obtained from: Yandex LLC
2014-09-10 12:35:42 +00:00
hashkey_faddr = INP6_PCBHASHKEY(&inp->in6p_faddr);
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
else
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif
udp IPv6 support, IPv6/IPv4 tunneling support in kernel, packet divert at kernel for IPv6/IPv4 translater daemon This includes queue related patch submitted by jburkhol@home.com. Submitted by: queue related patch from jburkhol@home.com Reviewed by: freebsd-arch, cvs-committers Obtained from: KAME project
1999-12-07 17:39:16 +00:00
hashkey_faddr = inp->inp_faddr.s_addr;
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
Rename some fields of struct inpcbinfo to have the ipi_ prefix, consistent with the naming of other structure field members, and reducing improper grep matches. Clean up and comment structure fields in structure definition.
2007-04-30 23:12:05 +00:00
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(hashkey_faddr,
inp->inp_lport, inp->inp_fport, pcbinfo->ipi_hashmask)];
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
LIST_REMOVE(inp, inp_hash);
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
LIST_INSERT_HEAD(head, inp, inp_hash);
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#ifdef PCBGROUP
if (m != NULL)
in_pcbgroup_update_mbuf(inp, m);
else
in_pcbgroup_update(inp);
#endif
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
}
Add _mbuf() variants of various inpcb-related interfaces, including lookup, hash install, etc. For now, these are arguments are unused, but as we add RSS support, we will want to use hashes extracted from mbufs, rather than manually calculated hashes of header fields, due to the expensive of the software version of Toeplitz (and similar hashes). Add notes that it would be nice to be able to pass mbufs into lookup routines in pf(4), optimising firewall lookup in the same way, but the code structure there doesn't facilitate that currently. (In principle there is no reason this couldn't be MFCed -- the change extends rather than modifies the KBI. However, it won't be useful without other previous possibly less MFCable changes.) Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-04 16:33:06 +00:00
void
in_pcbrehash(struct inpcb *inp)
{
in_pcbrehash_mbuf(inp, NULL);
}
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
/*
* Remove PCB from various lists.
*/
Staticize two functions not used outside of in_pcb.c: in_pcbremlists() and db_print_inpcb(). MFC after: 1 month
2009-05-14 20:59:36 +00:00
static void
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcbremlists(struct inpcb *inp)
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
{
add locking assertions Supported by: FreeBSD Foundation
2003-11-08 23:02:36 +00:00
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
#ifdef INVARIANTS
if (pcbinfo == &V_tcbinfo) {
INP_INFO_RLOCK_ASSERT(pcbinfo);
} else {
INP_INFO_WLOCK_ASSERT(pcbinfo);
}
#endif
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK_ASSERT(inp);
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_LIST_WLOCK_ASSERT(pcbinfo);
add locking assertions Supported by: FreeBSD Foundation
2003-11-08 23:02:36 +00:00
inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
Add INP_INHASHLIST flag for inpcb->inp_flags to indicate whether or not the inpcb is currenty on various hash lookup lists, rather than using (lport != 0) to detect this. This means that the full 4-tuple of a connection can be retained after close, which should lead to more sensible netstat output in the window between TCP close and socket close. MFC after: 2 weeks
2009-03-11 00:29:22 +00:00
if (inp->inp_flags & INP_INHASHLIST) {
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
struct inpcbport *phd = inp->inp_phd;
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_WLOCK(pcbinfo);
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
LIST_REMOVE(inp, inp_hash);
LIST_REMOVE(inp, inp_portlist);
Mechanical change to use <sys/queue.h> macro API instead of fondling implementation details. Created with: sed(1) Reviewed by: md5(1)
2001-02-04 13:13:25 +00:00
if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
LIST_REMOVE(phd, phd_hash);
free(phd, M_PCB);
}
Decompose the current single inpcbinfo lock into two locks: - The existing ipi_lock continues to protect the global inpcb list and inpcb counter. This lock is now relegated to a small number of allocation and free operations, and occasional operations that walk all connections (including, awkwardly, certain UDP multicast receive operations -- something to revisit). - A new ipi_hash_lock protects the two inpcbinfo hash tables for looking up connections and bound sockets, manipulated using new INP_HASH_*() macros. This lock, combined with inpcb locks, protects the 4-tuple address space. Unlike the current ipi_lock, ipi_hash_lock follows the individual inpcb connection locks, so may be acquired while manipulating a connection on which a lock is already held, avoiding the need to acquire the inpcbinfo lock preemptively when a binding change might later be required. As a result, however, lookup operations necessarily go through a reference acquire while holding the lookup lock, later acquiring an inpcb lock -- if required. A new function in_pcblookup() looks up connections, and accepts flags indicating how to return the inpcb. Due to lock order changes, callers no longer need acquire locks before performing a lookup: the lookup routine will acquire the ipi_hash_lock as needed. In the future, it will also be able to use alternative lookup and locking strategies transparently to callers, such as pcbgroup lookup. New lookup flags are, supplementing the existing INPLOOKUP_WILDCARD flag: INPLOOKUP_RLOCKPCB - Acquire a read lock on the returned inpcb INPLOOKUP_WLOCKPCB - Acquire a write lock on the returned inpcb Callers must pass exactly one of these flags (for the time being). Some notes: - All protocols are updated to work within the new regime; especially, TCP, UDPv4, and UDPv6. pcbinfo ipi_lock acquisitions are largely eliminated, and global hash lock hold times are dramatically reduced compared to previous locking. - The TCP syncache still relies on the pcbinfo lock, something that we may want to revisit. - Support for reverting to the FreeBSD 7.x locking strategy in TCP input is no longer available -- hash lookup locks are now held only very briefly during inpcb lookup, rather than for potentially extended periods. However, the pcbinfo ipi_lock will still be acquired if a connection state might change such that a connection is added or removed. - Raw IP sockets continue to use the pcbinfo ipi_lock for protection, due to maintaining their own hash tables. - The interface in6_pcblookup_hash_locked() is maintained, which allows callers to acquire hash locks and perform one or more lookups atomically with 4-tuple allocation: this is required only for TCPv6, as there is no in6_pcbconnect_setup(), which there should be. - UDPv6 locking remains significantly more conservative than UDPv4 locking, which relates to source address selection. This needs attention, as it likely significantly reduces parallelism in this code for multithreaded socket use (such as in BIND). - In the UDPv4 and UDPv6 multicast cases, we need to revisit locking somewhat, as they relied on ipi_lock to stablise 4-tuple matches, which is no longer sufficient. A second check once the inpcb lock is held should do the trick, keeping the general case from requiring the inpcb lock for every inpcb visited. - This work reminds us that we need to revisit locking of the v4/v6 flags, which may be accessed lock-free both before and after this change. - Right now, a single lock name is used for the pcbhash lock -- this is undesirable, and probably another argument is required to take care of this (or a char array name field in the pcbinfo?). This is not an MFC candidate for 8.x due to its impact on lookup and locking semantics. It's possible some of these issues could be worked around with compatibility wrappers, if necessary. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-05-30 09:43:55 +00:00
INP_HASH_WUNLOCK(pcbinfo);
Add INP_INHASHLIST flag for inpcb->inp_flags to indicate whether or not the inpcb is currenty on various hash lookup lists, rather than using (lport != 0) to detect this. This means that the full 4-tuple of a connection can be retained after close, which should lead to more sensible netstat output in the window between TCP close and socket close. MFC after: 2 weeks
2009-03-11 00:29:22 +00:00
inp->inp_flags &= ~INP_INHASHLIST;
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
1998-01-27 09:15:13 +00:00
}
LIST_REMOVE(inp, inp_list);
add locking assertions Supported by: FreeBSD Foundation
2003-11-08 23:02:36 +00:00
pcbinfo->ipi_count--;
Implement a CPU-affine TCP and UDP connection lookup data structure, struct inpcbgroup. pcbgroups, or "connection groups", supplement the existing inpcbinfo connection hash table, which when pcbgroups are enabled, might now be thought of more usefully as a per-protocol 4-tuple reservation table. Connections are assigned to connection groups base on a hash of their 4-tuple; wildcard sockets require special handling, and are members of all connection groups. During a connection lookup, a per-connection group lock is employed rather than the global pcbinfo lock. By aligning connection groups with input path processing, connection groups take on an effective CPU affinity, especially when aligned with RSS work placement (see a forthcoming commit for details). This eliminates cache line migration associated with global, protocol-layer data structures in steady state TCP and UDP processing (with the exception of protocol-layer statistics; further commit to follow). Elements of this approach were inspired by Willman, Rixner, and Cox's 2006 USENIX paper, "An Evaluation of Network Stack Parallelization Strategies in Modern Operating Systems". However, there are also significant differences: we maintain the inpcb lock, rather than using the connection group lock for per-connection state. Likewise, the focus of this implementation is alignment with NIC packet distribution strategies such as RSS, rather than pure software strategies. Despite that focus, software distribution is supported through the parallel netisr implementation, and works well in configurations where the number of hardware threads is greater than the number of NIC input queues, such as in the RMI XLR threaded MIPS architecture. Another important difference is the continued maintenance of existing hash tables as "reservation tables" -- these are useful both to distinguish the resource allocation aspect of protocol name management and the more common-case lookup aspect. In configurations where connection tables are aligned with hardware hashes, it is desirable to use the traditional lookup tables for loopback or encapsulated traffic rather than take the expense of hardware hashes that are hard to implement efficiently in software (such as RSS Toeplitz). Connection group support is enabled by compiling "options PCBGROUP" into your kernel configuration; for the time being, this is an experimental feature, and hence is not enabled by default. Subject to the limited MFCability of change dependencies in inpcb, and its change to the inpcbinfo init function signature, this change in principle could be merged to FreeBSD 8.x. Reviewed by: bz Sponsored by: Juniper Networks, Inc.
2011-06-06 12:55:02 +00:00
#ifdef PCBGROUP
in_pcbgroup_remove(inp);
#endif
Implemented PCB hashing. Includes new functions in_pcbinshash, in_pcbrehash, and in_pcblookuphash.
1995-04-09 01:29:31 +00:00
}
This Implements the mumbled about "Jail" feature. This is a seriously beefed up chroot kind of thing. The process is jailed along the same lines as a chroot does it, but with additional tough restrictions imposed on what the superuser can do. For all I know, it is safe to hand over the root bit inside a prison to the customer living in that prison, this is what it was developed for in fact: "real virtual servers". Each prison has an ip number associated with it, which all IP communications will be coerced to use and each prison has its own hostname. Needless to say, you need more RAM this way, but the advantage is that each customer can run their own particular version of apache and not stomp on the toes of their neighbors. It generally does what one would expect, but setting up a jail still takes a little knowledge. A few notes: I have no scripts for setting up a jail, don't ask me for them. The IP number should be an alias on one of the interfaces. mount a /proc in each jail, it will make ps more useable. /proc/<pid>/status tells the hostname of the prison for jailed processes. Quotas are only sensible if you have a mountpoint per prison. There are no privisions for stopping resource-hogging. Some "#ifdef INET" and similar may be missing (send patches!) If somebody wants to take it from here and develop it into more of a "virtual machine" they should be most welcome! Tools, comments, patches & documentation most welcome. Have fun... Sponsored by: http://www.rndassociates.com/ Run for almost a year by: http://www.servetheweb.com/
1999-04-28 11:38:52 +00:00
FreeBSD previously provided route caching for TCP (and UDP). Re-add route caching for TCP, with some improvements. In particular, invalidate the route cache if a new route is added, which might be a better match. The cache is automatically invalidated if the old route is deleted. Submitted by: Mike Karels Reviewed by: gnn Differential Revision: https://reviews.freebsd.org/D4306
2016-03-24 07:54:56 +00:00
/*
* Check for alternatives when higher level complains
* about service problems. For now, invalidate cached
* routing information. If the route was created dynamically
* (by a redirect), time to try a default gateway again.
*/
void
in_losing(struct inpcb *inp)
{
Reduce code duplication for inpcb route caching Add a new macro to clear both the L3 and L2 route caches, to hopefully prevent future instances where only the L3 cache was cleared when both should have been. MFC after: 1 week Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D13989 Reviewed by: karels
2018-01-23 03:15:39 +00:00
RO_INVALIDATE_CACHE(&inp->inp_route);
FreeBSD previously provided route caching for TCP (and UDP). Re-add route caching for TCP, with some improvements. In particular, invalidate the route cache if a new route is added, which might be a better match. The cache is automatically invalidated if the old route is deleted. Submitted by: Mike Karels Reviewed by: gnn Differential Revision: https://reviews.freebsd.org/D4306
2016-03-24 07:54:56 +00:00
return;
}
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
/*
* A set label operation has occurred at the socket layer, propagate the
* label change into the in_pcb for the socket.
*/
void
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
in_pcbsosetlabel(struct socket *so)
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
{
#ifdef MAC
struct inpcb *inp;
Break out in_pcbdetach() into two functions: - in_pcbdetach(), which removes the link between an inpcb and its socket. - in_pcbfree(), which frees a detached pcb. Unlike the previous in_pcbdetach(), neither of these functions will attempt to conditionally free the socket, as they are responsible only for managing in_pcb memory. Mirror these changes into in6_pcbdetach() by breaking it into in6_pcbdetach() and in6_pcbfree(). While here, eliminate undesired checks for NULL inpcb pointers in sockets, as we will now have as an invariant that sockets will always have valid so_pcb pointers. MFC after: 3 months
2006-04-01 16:04:42 +00:00
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("in_pcbsosetlabel: so->so_pcb == NULL"));
Assert the inpcb lock when rehashing an inpcb. Improve consistency of style around some current assertions. MFC after: 3 months
2006-04-22 19:15:20 +00:00
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK(inp);
Socket MAC labels so_label and so_peerlabel are now protected by SOCK_LOCK(so): - Hold socket lock over calls to MAC entry points reading or manipulating socket labels. - Assert socket lock in MAC entry point implementations. - When externalizing the socket label, first make a thread-local copy while holding the socket lock, then release the socket lock to externalize to userspace.
2004-06-13 02:50:07 +00:00
SOCK_LOCK(so);
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
mac_inpcb_sosetlabel(so, inp);
Socket MAC labels so_label and so_peerlabel are now protected by SOCK_LOCK(so): - Hold socket lock over calls to MAC entry points reading or manipulating socket labels. - Assert socket lock in MAC entry point implementations. - When externalizing the socket label, first make a thread-local copy while holding the socket lock, then release the socket lock to externalize to userspace.
2004-06-13 02:50:07 +00:00
SOCK_UNLOCK(so);
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WUNLOCK(inp);
Introduce a MAC label reference in 'struct inpcb', which caches the MAC label referenced from 'struct socket' in the IPv4 and IPv6-based protocols. This permits MAC labels to be checked during network delivery operations without dereferencing inp->inp_socket to get to so->so_label, which will eventually avoid our having to grab the socket lock during delivery at the network layer. This change introduces 'struct inpcb' as a labeled object to the MAC Framework, along with the normal circus of entry points: initialization, creation from socket, destruction, as well as a delivery access control check. For most policies, the inpcb label will simply be a cache of the socket label, so a new protocol switch method is introduced, pr_sosetlabel() to notify protocols that the socket layer label has been updated so that the cache can be updated while holding appropriate locks. Most protocols implement this using pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use the the worker function in_pcbsosetlabel(), which calls into the MAC Framework to perform a cache update. Biba, LOMAC, and MLS implement these entry points, as do the stub policy, and test policy. Reviewed by: sam, bms Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00
#endif
}
Port randomization leads to extremely fast port reuse at high connection rates, which is causing problems for some users. To retain the security advantage of random ports and ensure correct operation for high connection rate users, disable port randomization during periods of high connection rates. Whenever the connection rate exceeds randomcps (10 by default), randomization will be disabled for randomtime (45 by default) seconds. These thresholds may be tuned via sysctl. Many thanks to Igor Sysoev, who proved the necessity of this change and tested many preliminary versions of the patch. MFC After: 20 seconds
2005-01-02 01:50:57 +00:00
/*
Minor restyling and cleanup around ipport_tick(). MFC after: 1 month
2006-06-02 08:18:27 +00:00
* ipport_tick runs once per second, determining if random port allocation
* should be continued. If more than ipport_randomcps ports have been
* allocated in the last second, then we return to sequential port
* allocation. We return to random allocation only once we drop below
* ipport_randomcps for at least ipport_randomtime seconds.
Port randomization leads to extremely fast port reuse at high connection rates, which is causing problems for some users. To retain the security advantage of random ports and ensure correct operation for high connection rate users, disable port randomization during periods of high connection rates. Whenever the connection rate exceeds randomcps (10 by default), randomization will be disabled for randomtime (45 by default) seconds. These thresholds may be tuned via sysctl. Many thanks to Igor Sysoev, who proved the necessity of this change and tested many preliminary versions of the patch. MFC After: 20 seconds
2005-01-02 01:50:57 +00:00
*/
MFp4 CH=191470: Move the ipport_tick_callout and related functions from ip_input.c to in_pcb.c. The random source port allocation code has been merged and is now local to in_pcb.c only. Use a SYSINIT to get the callout started and no longer depend on initialization from the inet code, which would not work in an IPv6 only setup. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-20 08:00:29 +00:00
static void
Convert remaining functions to ANSI C function declarations; remove 'register' where present. MFC after: 1 week
2006-01-22 01:16:25 +00:00
ipport_tick(void *xtp)
Port randomization leads to extremely fast port reuse at high connection rates, which is causing problems for some users. To retain the security advantage of random ports and ensure correct operation for high connection rate users, disable port randomization during periods of high connection rates. Whenever the connection rate exceeds randomcps (10 by default), randomization will be disabled for randomtime (45 by default) seconds. These thresholds may be tuned via sysctl. Many thanks to Igor Sysoev, who proved the necessity of this change and tested many preliminary versions of the patch. MFC After: 20 seconds
2005-01-02 01:50:57 +00:00
{
Step 1.5 of importing the network stack virtualization infrastructure from the vimage project, as per plan established at devsummit 08/08: http://wiki.freebsd.org/Image/Notes200808DevSummit Introduce INIT_VNET_*() initializer macros, VNET_FOREACH() iterator macros, and CURVNET_SET() context setting macros, all currently resolving to NOPs. Prepare for virtualization of selected SYSCTL objects by introducing a family of SYSCTL_V_*() macros, currently resolving to their global counterparts, i.e. SYSCTL_V_INT() == SYSCTL_INT(). Move selected #defines from sys/sys/vimage.h to newly introduced header files specific to virtualized subsystems (sys/net/vnet.h, sys/netinet/vinet.h etc.). All the changes are verified to have zero functional impact at this point in time by doing MD5 comparision between pre- and post-change object files(*). (*) netipsec/keysock.c did not validate depending on compile time options. Implemented by: julian, bz, brooks, zec Reviewed by: julian, bz, brooks, kris, rwatson, ... Approved by: julian (mentor) Obtained from: //depot/projects/vimage-commit2/... X-MFC after: never Sponsored by: NLnet Foundation, The FreeBSD Foundation
2008-10-02 15:37:58 +00:00
VNET_ITERATOR_DECL(vnet_iter);
Reimplement and/or implement vnet list locking by replacing a mostly unused custom mutex/condvar-based sleep locks with two locks: an rwlock (for non-sleeping use) and sxlock (for sleeping use). Either acquired for read is sufficient to stabilize the vnet list, but both must be acquired for write to modify the list. Replace previous no-op read locking macros, used in various places in the stack, with actual locking to prevent race conditions. Callers must declare when they may perform unbounded sleeps or not when selecting how to lock. Refactor vnet sysinits so that the vnet list and locks are initialized before kernel modules are linked, as the kernel linker will use them for modules loaded by the boot loader. Update various consumers of these KPIs based on whether they may sleep or not. Reviewed by: bz Approved by: re (kib)
2009-07-19 14:20:53 +00:00
VNET_LIST_RLOCK_NOSLEEP();
Step 1.5 of importing the network stack virtualization infrastructure from the vimage project, as per plan established at devsummit 08/08: http://wiki.freebsd.org/Image/Notes200808DevSummit Introduce INIT_VNET_*() initializer macros, VNET_FOREACH() iterator macros, and CURVNET_SET() context setting macros, all currently resolving to NOPs. Prepare for virtualization of selected SYSCTL objects by introducing a family of SYSCTL_V_*() macros, currently resolving to their global counterparts, i.e. SYSCTL_V_INT() == SYSCTL_INT(). Move selected #defines from sys/sys/vimage.h to newly introduced header files specific to virtualized subsystems (sys/net/vnet.h, sys/netinet/vinet.h etc.). All the changes are verified to have zero functional impact at this point in time by doing MD5 comparision between pre- and post-change object files(*). (*) netipsec/keysock.c did not validate depending on compile time options. Implemented by: julian, bz, brooks, zec Reviewed by: julian, bz, brooks, kris, rwatson, ... Approved by: julian (mentor) Obtained from: //depot/projects/vimage-commit2/... X-MFC after: never Sponsored by: NLnet Foundation, The FreeBSD Foundation
2008-10-02 15:37:58 +00:00
VNET_FOREACH(vnet_iter) {
CURVNET_SET(vnet_iter); /* XXX appease INVARIANTS here */
if (V_ipport_tcpallocs <=
V_ipport_tcplastcount + V_ipport_randomcps) {
if (V_ipport_stoprandom > 0)
V_ipport_stoprandom--;
} else
V_ipport_stoprandom = V_ipport_randomtime;
V_ipport_tcplastcount = V_ipport_tcpallocs;
CURVNET_RESTORE();
}
Reimplement and/or implement vnet list locking by replacing a mostly unused custom mutex/condvar-based sleep locks with two locks: an rwlock (for non-sleeping use) and sxlock (for sleeping use). Either acquired for read is sufficient to stabilize the vnet list, but both must be acquired for write to modify the list. Replace previous no-op read locking macros, used in various places in the stack, with actual locking to prevent race conditions. Callers must declare when they may perform unbounded sleeps or not when selecting how to lock. Refactor vnet sysinits so that the vnet list and locks are initialized before kernel modules are linked, as the kernel linker will use them for modules loaded by the boot loader. Update various consumers of these KPIs based on whether they may sleep or not. Reviewed by: bz Approved by: re (kib)
2009-07-19 14:20:53 +00:00
VNET_LIST_RUNLOCK_NOSLEEP();
Port randomization leads to extremely fast port reuse at high connection rates, which is causing problems for some users. To retain the security advantage of random ports and ensure correct operation for high connection rate users, disable port randomization during periods of high connection rates. Whenever the connection rate exceeds randomcps (10 by default), randomization will be disabled for randomtime (45 by default) seconds. These thresholds may be tuned via sysctl. Many thanks to Igor Sysoev, who proved the necessity of this change and tested many preliminary versions of the patch. MFC After: 20 seconds
2005-01-02 01:50:57 +00:00
callout_reset(&ipport_tick_callout, hz, ipport_tick, NULL);
}
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
MFp4 CH=191470: Move the ipport_tick_callout and related functions from ip_input.c to in_pcb.c. The random source port allocation code has been merged and is now local to in_pcb.c only. Use a SYSINIT to get the callout started and no longer depend on initialization from the inet code, which would not work in an IPv6 only setup. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-20 08:00:29 +00:00
static void
ip_fini(void *xtp)
{
callout_stop(&ipport_tick_callout);
}
/*
* The ipport_callout should start running at about the time we attach the
* inet or inet6 domains.
*/
static void
ipport_tick_init(const void *unused __unused)
{
/* Start ipport_tick. */
CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten years for head. However, it is continuously misused as the mpsafe argument for callout_init(9). Deprecate the flag and clean up callout_init() calls to make them more consistent. Differential Revision: https://reviews.freebsd.org/D2613 Reviewed by: jhb MFC after: 2 weeks
2015-05-22 17:05:21 +00:00
callout_init(&ipport_tick_callout, 1);
MFp4 CH=191470: Move the ipport_tick_callout and related functions from ip_input.c to in_pcb.c. The random source port allocation code has been merged and is now local to in_pcb.c only. Use a SYSINIT to get the callout started and no longer depend on initialization from the inet code, which would not work in an IPv6 only setup. Reviewed by: gnn Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 4 days
2011-04-20 08:00:29 +00:00
callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
SHUTDOWN_PRI_DEFAULT);
}
SYSINIT(ipport_tick_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
ipport_tick_init, NULL);
Insulate inpcb consumers outside the stack from the lock type and offset within the pcb by adding accessor functions. Reviewed by: rwatson MFC after: 3 weeks
2008-03-23 22:34:16 +00:00
void
inp_wlock(struct inpcb *inp)
{
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK(inp);
Insulate inpcb consumers outside the stack from the lock type and offset within the pcb by adding accessor functions. Reviewed by: rwatson MFC after: 3 weeks
2008-03-23 22:34:16 +00:00
}
void
inp_wunlock(struct inpcb *inp)
{
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WUNLOCK(inp);
Insulate inpcb consumers outside the stack from the lock type and offset within the pcb by adding accessor functions. Reviewed by: rwatson MFC after: 3 weeks
2008-03-23 22:34:16 +00:00
}
void
inp_rlock(struct inpcb *inp)
{
When querying the local or foreign address from an IP socket, acquire only a read lock on the inpcb. When an external module requests a read lock, acquire only a read lock. MFC after: 3 months
2008-04-19 14:34:38 +00:00
INP_RLOCK(inp);
Insulate inpcb consumers outside the stack from the lock type and offset within the pcb by adding accessor functions. Reviewed by: rwatson MFC after: 3 weeks
2008-03-23 22:34:16 +00:00
}
void
inp_runlock(struct inpcb *inp)
{
When querying the local or foreign address from an IP socket, acquire only a read lock on the inpcb. When an external module requests a read lock, acquire only a read lock. MFC after: 3 months
2008-04-19 14:34:38 +00:00
INP_RUNLOCK(inp);
Insulate inpcb consumers outside the stack from the lock type and offset within the pcb by adding accessor functions. Reviewed by: rwatson MFC after: 3 weeks
2008-03-23 22:34:16 +00:00
}
Make inp_lock_assert() depend on INVARIANT_SUPPORT, not INVARIANTS. This will make INVARIANT-enabled modules, that use this function to load successfully on a kernel that has INVARIANT_SUPPORT only.
2017-03-09 00:55:19 +00:00
#ifdef INVARIANT_SUPPORT
Insulate inpcb consumers outside the stack from the lock type and offset within the pcb by adding accessor functions. Reviewed by: rwatson MFC after: 3 weeks
2008-03-23 22:34:16 +00:00
void
change inp_wlock_assert to inp_lock_assert
2008-03-24 20:24:04 +00:00
inp_lock_assert(struct inpcb *inp)
Insulate inpcb consumers outside the stack from the lock type and offset within the pcb by adding accessor functions. Reviewed by: rwatson MFC after: 3 weeks
2008-03-23 22:34:16 +00:00
{
Convert pcbinfo and inpcb mutexes to rwlocks, and modify macros to explicitly select write locking for all use of the inpcb mutex. Update some pcbinfo lock assertions to assert locked rather than write-locked, although in practice almost all uses of the pcbinfo rwlock main exclusive, and all instances of inpcb lock acquisition are exclusive. This change should introduce (ideally) little functional change. However, it lays the groundwork for significantly increased parallelism in the TCP/IP code. MFC after: 3 months Tested by: kris (superset of committered patch)
2008-04-17 21:38:18 +00:00
INP_WLOCK_ASSERT(inp);
Insulate inpcb consumers outside the stack from the lock type and offset within the pcb by adding accessor functions. Reviewed by: rwatson MFC after: 3 weeks
2008-03-23 22:34:16 +00:00
}
void
change inp_wlock_assert to inp_lock_assert
2008-03-24 20:24:04 +00:00
inp_unlock_assert(struct inpcb *inp)
Insulate inpcb consumers outside the stack from the lock type and offset within the pcb by adding accessor functions. Reviewed by: rwatson MFC after: 3 weeks
2008-03-23 22:34:16 +00:00
{
INP_UNLOCK_ASSERT(inp);
}
#endif
add inpcb accessor functions for fields needed by TOE devices
2008-07-21 00:08:34 +00:00
void
inp_apply_all(void (*func)(struct inpcb *, void *), void *arg)
{
struct inpcb *inp;
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_INFO_WLOCK(&V_tcbinfo);
Merge more of currently non-functional (i.e. resolving to whitespace) macros from p4/vimage branch. Do a better job at enclosing all instantiations of globals scheduled for virtualization in #ifdef VIMAGE_GLOBALS blocks. De-virtualize and mark as const saorder_state_alive and saorder_state_any arrays from ipsec code, given that they are never updated at runtime, so virtualizing them would be pointless. Reviewed by: bz, julian Approved by: julian (mentor) Obtained from: //depot/projects/vimage-commit2/... X-MFC after: never Sponsored by: NLnet Foundation, The FreeBSD Foundation
2008-11-26 22:32:07 +00:00
LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
add inpcb accessor functions for fields needed by TOE devices
2008-07-21 00:08:34 +00:00
INP_WLOCK(inp);
func(inp, arg);
INP_WUNLOCK(inp);
}
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: - The existing TCP INP_INFO lock continues to protect the global inpcb list stability during full list traversal (e.g. tcp_pcblist()). - A new INP_LIST lock protects inpcb list actual modifications (inp allocation and free) and inpcb global counters. It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input()) and INP_INFO_WLOCK only in occasional operations that walk all connections. PR: 183659 Differential Revision: https://reviews.freebsd.org/D2599 Reviewed by: jhb, adrian Tested by: adrian, nitroboost-gmail.com Sponsored by: Verisign, Inc.
2015-08-03 12:13:54 +00:00
INP_INFO_WUNLOCK(&V_tcbinfo);
add inpcb accessor functions for fields needed by TOE devices
2008-07-21 00:08:34 +00:00
}
struct socket *
inp_inpcbtosocket(struct inpcb *inp)
{
INP_WLOCK_ASSERT(inp);
return (inp->inp_socket);
}
struct tcpcb *
inp_inpcbtotcpcb(struct inpcb *inp)
{
INP_WLOCK_ASSERT(inp);
return ((struct tcpcb *)inp->inp_ppcb);
}
int
inp_ip_tos_get(const struct inpcb *inp)
{
return (inp->inp_ip_tos);
}
void
inp_ip_tos_set(struct inpcb *inp, int val)
{
inp->inp_ip_tos = val;
}
void
Trying to fix compilation bustage: - removing 'const' qualifier from an input parameter to conform to the type required by rw_assert(); - using in_addr->s_addr to retrive 32 bits address value. Observed by: tinderbox
2008-07-22 04:23:57 +00:00
inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
make new accessor functions consistent with existing style
2008-07-21 22:11:39 +00:00
uint32_t *faddr, uint16_t *fp)
add inpcb accessor functions for fields needed by TOE devices
2008-07-21 00:08:34 +00:00
{
make new accessor functions consistent with existing style
2008-07-21 22:11:39 +00:00
INP_LOCK_ASSERT(inp);
Trying to fix compilation bustage: - removing 'const' qualifier from an input parameter to conform to the type required by rw_assert(); - using in_addr->s_addr to retrive 32 bits address value. Observed by: tinderbox
2008-07-22 04:23:57 +00:00
*laddr = inp->inp_laddr.s_addr;
*faddr = inp->inp_faddr.s_addr;
add inpcb accessor functions for fields needed by TOE devices
2008-07-21 00:08:34 +00:00
*lp = inp->inp_lport;
*fp = inp->inp_fport;
}
Add accessor functions for socket fields. MFC after: 1 week
2008-07-21 00:49:34 +00:00
struct inpcb *
so_sotoinpcb(struct socket *so)
{
return (sotoinpcb(so));
}
struct tcpcb *
so_sototcpcb(struct socket *so)
{
return (sototcpcb(so));
}
Hide struct inpcb, struct tcpcb from the userland. This is a painful change, but it is needed. On the one hand, we avoid modifying them, and this slows down some ideas, on the other hand we still eventually modify them and tools like netstat(1) never work on next version of FreeBSD. We maintain a ton of spares in them, and we already got some ifdef hell at the end of tcpcb. Details: - Hide struct inpcb, struct tcpcb under _KERNEL || _WANT_FOO. - Make struct xinpcb, struct xtcpcb pure API structures, not including kernel structures inpcb and tcpcb inside. Export into these structures the fields from inpcb and tcpcb that are known to be used, and put there a ton of spare space. - Make kernel and userland utilities compilable after these changes. - Bump __FreeBSD_version. Reviewed by: rrs, gnn Differential Revision: D10018
2017-03-21 06:39:49 +00:00
/*
* Create an external-format (``xinpcb'') structure using the information in
* the kernel-format in_pcb structure pointed to by inp. This is done to
* reduce the spew of irrelevant information over this interface, to isolate
* user code from changes in the kernel structure, and potentially to provide
* information-hiding if we decide that some of this information should be
* hidden from users.
*/
void
in_pcbtoxinpcb(const struct inpcb *inp, struct xinpcb *xi)
{
xi->xi_len = sizeof(struct xinpcb);
if (inp->inp_socket)
sotoxsocket(inp->inp_socket, &xi->xi_socket);
else
bzero(&xi->xi_socket, sizeof(struct xsocket));
bcopy(&inp->inp_inc, &xi->inp_inc, sizeof(struct in_conninfo));
xi->inp_gencnt = inp->inp_gencnt;
xi->inp_ppcb = inp->inp_ppcb;
xi->inp_flow = inp->inp_flow;
xi->inp_flowid = inp->inp_flowid;
xi->inp_flowtype = inp->inp_flowtype;
xi->inp_flags = inp->inp_flags;
xi->inp_flags2 = inp->inp_flags2;
xi->inp_rss_listen_bucket = inp->inp_rss_listen_bucket;
xi->in6p_cksum = inp->in6p_cksum;
xi->in6p_hops = inp->in6p_hops;
xi->inp_ip_tos = inp->inp_ip_tos;
xi->inp_vflag = inp->inp_vflag;
xi->inp_ip_ttl = inp->inp_ip_ttl;
xi->inp_ip_p = inp->inp_ip_p;
xi->inp_ip_minttl = inp->inp_ip_minttl;
}
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
#ifdef DDB
static void
db_print_indent(int indent)
{
int i;
for (i = 0; i < indent; i++)
db_printf(" ");
}
static void
db_print_inconninfo(struct in_conninfo *inc, const char *name, int indent)
{
char faddr_str[48], laddr_str[48];
db_print_indent(indent);
db_printf("%s at %p\n", name, inc);
indent += 2;
#ifdef INET6 printing of inpcb IPv6 addresses in DDB. Patch committed with minor adjustments. Submitted by: Florian C. Smeets <flo at kasimir dot com>
2007-02-18 08:57:23 +00:00
#ifdef INET6
Use inc_flags instead of the inc_isipv6 alias which so far had been the only flag with random usage patterns. Switch inc_flags to be used as a real bit field by using INC_ISIPV6 with bitops to check for the 'isipv6' condition. While here fix a place or two where in case of v4 inc_flags were not properly initialized before.[1] Found by: rwatson during review [1] Discussed with: rwatson Reviewed by: rwatson MFC after: 4 weeks
2008-12-17 12:52:34 +00:00
if (inc->inc_flags & INC_ISIPV6) {
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
/* IPv6. */
ip6_sprintf(laddr_str, &inc->inc6_laddr);
ip6_sprintf(faddr_str, &inc->inc6_faddr);
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
} else
#ifdef INET6 printing of inpcb IPv6 addresses in DDB. Patch committed with minor adjustments. Submitted by: Florian C. Smeets <flo at kasimir dot com>
2007-02-18 08:57:23 +00:00
#endif
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
{
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
/* IPv4. */
inet_ntoa_r(inc->inc_laddr, laddr_str);
inet_ntoa_r(inc->inc_faddr, faddr_str);
}
db_print_indent(indent);
db_printf("inc_laddr %s inc_lport %u\n", laddr_str,
ntohs(inc->inc_lport));
db_print_indent(indent);
db_printf("inc_faddr %s inc_fport %u\n", faddr_str,
ntohs(inc->inc_fport));
}
static void
db_print_inpflags(int inp_flags)
{
int comma;
comma = 0;
if (inp_flags & INP_RECVOPTS) {
db_printf("%sINP_RECVOPTS", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_RECVRETOPTS) {
db_printf("%sINP_RECVRETOPTS", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_RECVDSTADDR) {
db_printf("%sINP_RECVDSTADDR", comma ? ", " : "");
comma = 1;
}
The patch provides the same socket option as Linux IP_ORIGDSTADDR. Unfortunately they will have different integer value due to Linux value being already assigned in FreeBSD. The patch is similar to IP_RECVDSTADDR but also provides the destination port value to the application. This allows/improves implementation of transparent proxies on UDP sockets due to having the whole information on forwarded packets. Reviewed by: adrian, aw Approved by: ae (mentor) Sponsored by: rsync.net Differential Revision: D9235
2017-03-06 04:01:58 +00:00
if (inp_flags & INP_ORIGDSTADDR) {
db_printf("%sINP_ORIGDSTADDR", comma ? ", " : "");
comma = 1;
}
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
if (inp_flags & INP_HDRINCL) {
db_printf("%sINP_HDRINCL", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_HIGHPORT) {
db_printf("%sINP_HIGHPORT", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_LOWPORT) {
db_printf("%sINP_LOWPORT", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_ANONPORT) {
db_printf("%sINP_ANONPORT", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_RECVIF) {
db_printf("%sINP_RECVIF", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_MTUDISC) {
db_printf("%sINP_MTUDISC", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_RECVTTL) {
db_printf("%sINP_RECVTTL", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_DONTFRAG) {
db_printf("%sINP_DONTFRAG", comma ? ", " : "");
comma = 1;
}
Add a IP_RECVTOS socket option to receive for received UDP/IPv4 packets a cmsg of type IP_RECVTOS which contains the TOS byte. Much like IP_RECVTTL does for TTL. This allows to implement a protocol on top of UDP and implementing ECN. MFC after: 3 days
2012-06-12 14:02:38 +00:00
if (inp_flags & INP_RECVTOS) {
db_printf("%sINP_RECVTOS", comma ? ", " : "");
comma = 1;
}
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
if (inp_flags & IN6P_IPV6_V6ONLY) {
db_printf("%sIN6P_IPV6_V6ONLY", comma ? ", " : "");
comma = 1;
}
if (inp_flags & IN6P_PKTINFO) {
db_printf("%sIN6P_PKTINFO", comma ? ", " : "");
comma = 1;
}
if (inp_flags & IN6P_HOPLIMIT) {
db_printf("%sIN6P_HOPLIMIT", comma ? ", " : "");
comma = 1;
}
if (inp_flags & IN6P_HOPOPTS) {
db_printf("%sIN6P_HOPOPTS", comma ? ", " : "");
comma = 1;
}
if (inp_flags & IN6P_DSTOPTS) {
db_printf("%sIN6P_DSTOPTS", comma ? ", " : "");
comma = 1;
}
if (inp_flags & IN6P_RTHDR) {
db_printf("%sIN6P_RTHDR", comma ? ", " : "");
comma = 1;
}
if (inp_flags & IN6P_RTHDRDSTOPTS) {
db_printf("%sIN6P_RTHDRDSTOPTS", comma ? ", " : "");
comma = 1;
}
if (inp_flags & IN6P_TCLASS) {
db_printf("%sIN6P_TCLASS", comma ? ", " : "");
comma = 1;
}
if (inp_flags & IN6P_AUTOFLOWLABEL) {
db_printf("%sIN6P_AUTOFLOWLABEL", comma ? ", " : "");
comma = 1;
}
Correct a number of evolved problems with inp_vflag and inp_flags: certain flags that should have been in inp_flags ended up in inp_vflag, meaning that they were inconsistently locked, and in one case, interpreted. Move the following flags from inp_vflag to gaps in the inp_flags space (and clean up the inp_flags constants to make gaps more obvious to future takers): INP_TIMEWAIT INP_SOCKREF INP_ONESBCAST INP_DROPPED Some aspects of this change have no effect on kernel ABI at all, as these are UDP/TCP/IP-internal uses; however, netstat and sockstat detect INP_TIMEWAIT when listing TCP sockets, so any MFC will need to take this into account. MFC after: 1 week (or after dependencies are MFC'd) Reviewed by: bz
2009-03-15 09:58:31 +00:00
if (inp_flags & INP_TIMEWAIT) {
db_printf("%sINP_TIMEWAIT", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_ONESBCAST) {
db_printf("%sINP_ONESBCAST", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_DROPPED) {
db_printf("%sINP_DROPPED", comma ? ", " : "");
comma = 1;
}
if (inp_flags & INP_SOCKREF) {
db_printf("%sINP_SOCKREF", comma ? ", " : "");
comma = 1;
}
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
if (inp_flags & IN6P_RFC2292) {
db_printf("%sIN6P_RFC2292", comma ? ", " : "");
comma = 1;
}
if (inp_flags & IN6P_MTU) {
db_printf("IN6P_MTU%s", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_inpvflag(u_char inp_vflag)
{
int comma;
comma = 0;
if (inp_vflag & INP_IPV4) {
db_printf("%sINP_IPV4", comma ? ", " : "");
comma = 1;
}
if (inp_vflag & INP_IPV6) {
db_printf("%sINP_IPV6", comma ? ", " : "");
comma = 1;
}
if (inp_vflag & INP_IPV6PROTO) {
db_printf("%sINP_IPV6PROTO", comma ? ", " : "");
comma = 1;
}
}
Staticize two functions not used outside of in_pcb.c: in_pcbremlists() and db_print_inpcb(). MFC after: 1 month
2009-05-14 20:59:36 +00:00
static void
Add "show inpcb", "show tcpcb" DDB commands, which should come in handy for debugging sblock and other network panics.
2007-02-17 21:02:38 +00:00
db_print_inpcb(struct inpcb *inp, const char *name, int indent)
{
db_print_indent(indent);
db_printf("%s at %p\n", name, inp);
indent += 2;
db_print_indent(indent);
db_printf("inp_flow: 0x%x\n", inp->inp_flow);
db_print_inconninfo(&inp->inp_inc, "inp_conninfo", indent);
db_print_indent(indent);
db_printf("inp_ppcb: %p inp_pcbinfo: %p inp_socket: %p\n",
inp->inp_ppcb, inp->inp_pcbinfo, inp->inp_socket);
db_print_indent(indent);
db_printf("inp_label: %p inp_flags: 0x%x (",
inp->inp_label, inp->inp_flags);
db_print_inpflags(inp->inp_flags);
db_printf(")\n");
db_print_indent(indent);
db_printf("inp_sp: %p inp_vflag: 0x%x (", inp->inp_sp,
inp->inp_vflag);
db_print_inpvflag(inp->inp_vflag);
db_printf(")\n");
db_print_indent(indent);
db_printf("inp_ip_ttl: %d inp_ip_p: %d inp_ip_minttl: %d\n",
inp->inp_ip_ttl, inp->inp_ip_p, inp->inp_ip_minttl);
db_print_indent(indent);
#ifdef INET6
if (inp->inp_vflag & INP_IPV6) {
db_printf("in6p_options: %p in6p_outputopts: %p "
"in6p_moptions: %p\n", inp->in6p_options,
inp->in6p_outputopts, inp->in6p_moptions);
db_printf("in6p_icmp6filt: %p in6p_cksum %d "
"in6p_hops %u\n", inp->in6p_icmp6filt, inp->in6p_cksum,
inp->in6p_hops);
} else
#endif
{
db_printf("inp_ip_tos: %d inp_ip_options: %p "
"inp_ip_moptions: %p\n", inp->inp_ip_tos,
inp->inp_options, inp->inp_moptions);
}
db_print_indent(indent);
db_printf("inp_phd: %p inp_gencnt: %ju\n", inp->inp_phd,
(uintmax_t)inp->inp_gencnt);
}
DB_SHOW_COMMAND(inpcb, db_show_inpcb)
{
struct inpcb *inp;
if (!have_addr) {
db_printf("usage: show inpcb <addr>\n");
return;
}
inp = (struct inpcb *)addr;
db_print_inpcb(inp, "inpcb", 0);
}
Clean up some #endif comments removing from short sections. Add #endif comments to longer, also refining strange ones. Properly use #ifdef rather than #if defined() where possible. Four #if defined(PCBGROUP) occurances (netinet and netinet6) were ignored to avoid conflicts with eventually upcoming changes for RSS. Reported by: bde (most) Reviewed by: bde MFC after: 3 days
2012-01-22 02:13:19 +00:00
#endif /* DDB */
Implement kernel support for hardware rate limited sockets. - Add RATELIMIT kernel configuration keyword which must be set to enable the new functionality. - Add support for hardware driven, Receive Side Scaling, RSS aware, rate limited sendqueues and expose the functionality through the already established SO_MAX_PACING_RATE setsockopt(). The API support rates in the range from 1 to 4Gbytes/s which are suitable for regular TCP and UDP streams. The setsockopt(2) manual page has been updated. - Add rate limit function callback API to "struct ifnet" which supports the following operations: if_snd_tag_alloc(), if_snd_tag_modify(), if_snd_tag_query() and if_snd_tag_free(). - Add support to ifconfig to view, set and clear the IFCAP_TXRTLMT flag, which tells if a network driver supports rate limiting or not. - This patch also adds support for rate limiting through VLAN and LAGG intermediate network devices. - How rate limiting works: 1) The userspace application calls setsockopt() after accepting or making a new connection to set the rate which is then stored in the socket structure in the kernel. Later on when packets are transmitted a check is made in the transmit path for rate changes. A rate change implies a non-blocking ifp->if_snd_tag_alloc() call will be made to the destination network interface, which then sets up a custom sendqueue with the given rate limitation parameter. A "struct m_snd_tag" pointer is returned which serves as a "snd_tag" hint in the m_pkthdr for the subsequently transmitted mbufs. 2) When the network driver sees the "m->m_pkthdr.snd_tag" different from NULL, it will move the packets into a designated rate limited sendqueue given by the snd_tag pointer. It is up to the individual drivers how the rate limited traffic will be rate limited. 3) Route changes are detected by the NIC drivers in the ifp->if_transmit() routine when the ifnet pointer in the incoming snd_tag mismatches the one of the network interface. The network adapter frees the mbuf and returns EAGAIN which causes the ip_output() to release and clear the send tag. Upon next ip_output() a new "snd_tag" will be tried allocated. 4) When the PCB is detached the custom sendqueue will be released by a non-blocking ifp->if_snd_tag_free() call to the currently bound network interface. Reviewed by: wblock (manpages), adrian, gallatin, scottl (network) Differential Revision: https://reviews.freebsd.org/D3687 Sponsored by: Mellanox Technologies MFC after: 3 months
2017-01-18 13:31:17 +00:00
#ifdef RATELIMIT
/*
* Modify TX rate limit based on the existing "inp->inp_snd_tag",
* if any.
*/
int
in_pcbmodify_txrtlmt(struct inpcb *inp, uint32_t max_pacing_rate)
{
union if_snd_tag_modify_params params = {
.rate_limit.max_rate = max_pacing_rate,
};
struct m_snd_tag *mst;
struct ifnet *ifp;
int error;
mst = inp->inp_snd_tag;
if (mst == NULL)
return (EINVAL);
ifp = mst->ifp;
if (ifp == NULL)
return (EINVAL);
if (ifp->if_snd_tag_modify == NULL) {
error = EOPNOTSUPP;
} else {
error = ifp->if_snd_tag_modify(mst, &params);
}
return (error);
}
/*
* Query existing TX rate limit based on the existing
* "inp->inp_snd_tag", if any.
*/
int
in_pcbquery_txrtlmt(struct inpcb *inp, uint32_t *p_max_pacing_rate)
{
union if_snd_tag_query_params params = { };
struct m_snd_tag *mst;
struct ifnet *ifp;
int error;
mst = inp->inp_snd_tag;
if (mst == NULL)
return (EINVAL);
ifp = mst->ifp;
if (ifp == NULL)
return (EINVAL);
if (ifp->if_snd_tag_query == NULL) {
error = EOPNOTSUPP;
} else {
error = ifp->if_snd_tag_query(mst, &params);
if (error == 0 && p_max_pacing_rate != NULL)
*p_max_pacing_rate = params.rate_limit.max_rate;
}
return (error);
}
Add support for generic backpressure indicator for ratelimited transmit queues aswell as non-ratelimited ones. Add the required structure bits in order to support a backpressure indication with ratelimited connections aswell as non-ratelimited ones. The backpressure indicator is a value between zero and 65535 inclusivly, indicating if the destination transmit queue is empty or full respectivly. Applications can use this value as a decision point for when to stop transmitting data to avoid endless ENOBUFS error codes upon transmitting an mbuf. This indicator is also useful to reduce the latency for ratelimited queues. Reviewed by: gallatin, kib, gnn Differential Revision: https://reviews.freebsd.org/D11518 Sponsored by: Mellanox Technologies
2017-09-06 13:56:18 +00:00
/*
* Query existing TX queue level based on the existing
* "inp->inp_snd_tag", if any.
*/
int
in_pcbquery_txrlevel(struct inpcb *inp, uint32_t *p_txqueue_level)
{
union if_snd_tag_query_params params = { };
struct m_snd_tag *mst;
struct ifnet *ifp;
int error;
mst = inp->inp_snd_tag;
if (mst == NULL)
return (EINVAL);
ifp = mst->ifp;
if (ifp == NULL)
return (EINVAL);
if (ifp->if_snd_tag_query == NULL)
return (EOPNOTSUPP);
error = ifp->if_snd_tag_query(mst, &params);
if (error == 0 && p_txqueue_level != NULL)
*p_txqueue_level = params.rate_limit.queue_level;
return (error);
}
Implement kernel support for hardware rate limited sockets. - Add RATELIMIT kernel configuration keyword which must be set to enable the new functionality. - Add support for hardware driven, Receive Side Scaling, RSS aware, rate limited sendqueues and expose the functionality through the already established SO_MAX_PACING_RATE setsockopt(). The API support rates in the range from 1 to 4Gbytes/s which are suitable for regular TCP and UDP streams. The setsockopt(2) manual page has been updated. - Add rate limit function callback API to "struct ifnet" which supports the following operations: if_snd_tag_alloc(), if_snd_tag_modify(), if_snd_tag_query() and if_snd_tag_free(). - Add support to ifconfig to view, set and clear the IFCAP_TXRTLMT flag, which tells if a network driver supports rate limiting or not. - This patch also adds support for rate limiting through VLAN and LAGG intermediate network devices. - How rate limiting works: 1) The userspace application calls setsockopt() after accepting or making a new connection to set the rate which is then stored in the socket structure in the kernel. Later on when packets are transmitted a check is made in the transmit path for rate changes. A rate change implies a non-blocking ifp->if_snd_tag_alloc() call will be made to the destination network interface, which then sets up a custom sendqueue with the given rate limitation parameter. A "struct m_snd_tag" pointer is returned which serves as a "snd_tag" hint in the m_pkthdr for the subsequently transmitted mbufs. 2) When the network driver sees the "m->m_pkthdr.snd_tag" different from NULL, it will move the packets into a designated rate limited sendqueue given by the snd_tag pointer. It is up to the individual drivers how the rate limited traffic will be rate limited. 3) Route changes are detected by the NIC drivers in the ifp->if_transmit() routine when the ifnet pointer in the incoming snd_tag mismatches the one of the network interface. The network adapter frees the mbuf and returns EAGAIN which causes the ip_output() to release and clear the send tag. Upon next ip_output() a new "snd_tag" will be tried allocated. 4) When the PCB is detached the custom sendqueue will be released by a non-blocking ifp->if_snd_tag_free() call to the currently bound network interface. Reviewed by: wblock (manpages), adrian, gallatin, scottl (network) Differential Revision: https://reviews.freebsd.org/D3687 Sponsored by: Mellanox Technologies MFC after: 3 months
2017-01-18 13:31:17 +00:00
/*
* Allocate a new TX rate limit send tag from the network interface
* given by the "ifp" argument and save it in "inp->inp_snd_tag":
*/
int
in_pcbattach_txrtlmt(struct inpcb *inp, struct ifnet *ifp,
uint32_t flowtype, uint32_t flowid, uint32_t max_pacing_rate)
{
union if_snd_tag_alloc_params params = {
Add support for generic backpressure indicator for ratelimited transmit queues aswell as non-ratelimited ones. Add the required structure bits in order to support a backpressure indication with ratelimited connections aswell as non-ratelimited ones. The backpressure indicator is a value between zero and 65535 inclusivly, indicating if the destination transmit queue is empty or full respectivly. Applications can use this value as a decision point for when to stop transmitting data to avoid endless ENOBUFS error codes upon transmitting an mbuf. This indicator is also useful to reduce the latency for ratelimited queues. Reviewed by: gallatin, kib, gnn Differential Revision: https://reviews.freebsd.org/D11518 Sponsored by: Mellanox Technologies
2017-09-06 13:56:18 +00:00
.rate_limit.hdr.type = (max_pacing_rate == -1U) ?
IF_SND_TAG_TYPE_UNLIMITED : IF_SND_TAG_TYPE_RATE_LIMIT,
Implement kernel support for hardware rate limited sockets. - Add RATELIMIT kernel configuration keyword which must be set to enable the new functionality. - Add support for hardware driven, Receive Side Scaling, RSS aware, rate limited sendqueues and expose the functionality through the already established SO_MAX_PACING_RATE setsockopt(). The API support rates in the range from 1 to 4Gbytes/s which are suitable for regular TCP and UDP streams. The setsockopt(2) manual page has been updated. - Add rate limit function callback API to "struct ifnet" which supports the following operations: if_snd_tag_alloc(), if_snd_tag_modify(), if_snd_tag_query() and if_snd_tag_free(). - Add support to ifconfig to view, set and clear the IFCAP_TXRTLMT flag, which tells if a network driver supports rate limiting or not. - This patch also adds support for rate limiting through VLAN and LAGG intermediate network devices. - How rate limiting works: 1) The userspace application calls setsockopt() after accepting or making a new connection to set the rate which is then stored in the socket structure in the kernel. Later on when packets are transmitted a check is made in the transmit path for rate changes. A rate change implies a non-blocking ifp->if_snd_tag_alloc() call will be made to the destination network interface, which then sets up a custom sendqueue with the given rate limitation parameter. A "struct m_snd_tag" pointer is returned which serves as a "snd_tag" hint in the m_pkthdr for the subsequently transmitted mbufs. 2) When the network driver sees the "m->m_pkthdr.snd_tag" different from NULL, it will move the packets into a designated rate limited sendqueue given by the snd_tag pointer. It is up to the individual drivers how the rate limited traffic will be rate limited. 3) Route changes are detected by the NIC drivers in the ifp->if_transmit() routine when the ifnet pointer in the incoming snd_tag mismatches the one of the network interface. The network adapter frees the mbuf and returns EAGAIN which causes the ip_output() to release and clear the send tag. Upon next ip_output() a new "snd_tag" will be tried allocated. 4) When the PCB is detached the custom sendqueue will be released by a non-blocking ifp->if_snd_tag_free() call to the currently bound network interface. Reviewed by: wblock (manpages), adrian, gallatin, scottl (network) Differential Revision: https://reviews.freebsd.org/D3687 Sponsored by: Mellanox Technologies MFC after: 3 months
2017-01-18 13:31:17 +00:00
.rate_limit.hdr.flowid = flowid,
.rate_limit.hdr.flowtype = flowtype,
.rate_limit.max_rate = max_pacing_rate,
};
int error;
INP_WLOCK_ASSERT(inp);
if (inp->inp_snd_tag != NULL)
return (EINVAL);
if (ifp->if_snd_tag_alloc == NULL) {
error = EOPNOTSUPP;
} else {
error = ifp->if_snd_tag_alloc(ifp, &params, &inp->inp_snd_tag);
/*
* At success increment the refcount on
* the send tag's network interface:
*/
if (error == 0)
if_ref(inp->inp_snd_tag->ifp);
}
return (error);
}
/*
* Free an existing TX rate limit tag based on the "inp->inp_snd_tag",
* if any:
*/
void
in_pcbdetach_txrtlmt(struct inpcb *inp)
{
struct m_snd_tag *mst;
struct ifnet *ifp;
INP_WLOCK_ASSERT(inp);
mst = inp->inp_snd_tag;
inp->inp_snd_tag = NULL;
if (mst == NULL)
return;
ifp = mst->ifp;
if (ifp == NULL)
return;
/*
* If the device was detached while we still had reference(s)
* on the ifp, we assume if_snd_tag_free() was replaced with
* stubs.
*/
ifp->if_snd_tag_free(mst);
/* release reference count on network interface */
if_rele(ifp);
}
/*
* This function should be called when the INP_RATE_LIMIT_CHANGED flag
* is set in the fast path and will attach/detach/modify the TX rate
* limit send tag based on the socket's so_max_pacing_rate value.
*/
void
in_pcboutput_txrtlmt(struct inpcb *inp, struct ifnet *ifp, struct mbuf *mb)
{
struct socket *socket;
uint32_t max_pacing_rate;
bool did_upgrade;
int error;
if (inp == NULL)
return;
socket = inp->inp_socket;
if (socket == NULL)
return;
if (!INP_WLOCKED(inp)) {
/*
* NOTE: If the write locking fails, we need to bail
* out and use the non-ratelimited ring for the
* transmit until there is a new chance to get the
* write lock.
*/
if (!INP_TRY_UPGRADE(inp))
return;
did_upgrade = 1;
} else {
did_upgrade = 0;
}
/*
* NOTE: The so_max_pacing_rate value is read unlocked,
* because atomic updates are not required since the variable
* is checked at every mbuf we send. It is assumed that the
* variable read itself will be atomic.
*/
max_pacing_rate = socket->so_max_pacing_rate;
/*
* NOTE: When attaching to a network interface a reference is
* made to ensure the network interface doesn't go away until
* all ratelimit connections are gone. The network interface
* pointers compared below represent valid network interfaces,
* except when comparing towards NULL.
*/
if (max_pacing_rate == 0 && inp->inp_snd_tag == NULL) {
error = 0;
} else if (!(ifp->if_capenable & IFCAP_TXRTLMT)) {
if (inp->inp_snd_tag != NULL)
in_pcbdetach_txrtlmt(inp);
error = 0;
} else if (inp->inp_snd_tag == NULL) {
/*
* In order to utilize packet pacing with RSS, we need
* to wait until there is a valid RSS hash before we
* can proceed:
*/
if (M_HASHTYPE_GET(mb) == M_HASHTYPE_NONE) {
error = EAGAIN;
} else {
error = in_pcbattach_txrtlmt(inp, ifp, M_HASHTYPE_GET(mb),
mb->m_pkthdr.flowid, max_pacing_rate);
}
} else {
error = in_pcbmodify_txrtlmt(inp, max_pacing_rate);
}
if (error == 0 || error == EOPNOTSUPP)
inp->inp_flags2 &= ~INP_RATE_LIMIT_CHANGED;
if (did_upgrade)
INP_DOWNGRADE(inp);
}
/*
* Track route changes for TX rate limiting.
*/
void
in_pcboutput_eagain(struct inpcb *inp)
{
struct socket *socket;
bool did_upgrade;
if (inp == NULL)
return;
socket = inp->inp_socket;
if (socket == NULL)
return;
if (inp->inp_snd_tag == NULL)
return;
if (!INP_WLOCKED(inp)) {
/*
* NOTE: If the write locking fails, we need to bail
* out and use the non-ratelimited ring for the
* transmit until there is a new chance to get the
* write lock.
*/
if (!INP_TRY_UPGRADE(inp))
return;
did_upgrade = 1;
} else {
did_upgrade = 0;
}
/* detach rate limiting */
in_pcbdetach_txrtlmt(inp);
/* make sure new mbuf send tag allocation is made */
inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
if (did_upgrade)
INP_DOWNGRADE(inp);
}
#endif /* RATELIMIT */
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