eddfbb763d
(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)
296 lines
8.2 KiB
C
296 lines
8.2 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1988, 1990, 1993, 1994, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tcp_input.c 8.12 (Berkeley) 5/24/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_tcpdebug.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <sys/vimage.h>
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#include <vm/uma.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_options.h>
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#include <netinet/ip6.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet6/tcp6_var.h>
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#include <netinet/tcpip.h>
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#ifdef TCPDEBUG
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#include <netinet/tcp_debug.h>
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#endif /* TCPDEBUG */
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static VNET_DEFINE(int, tcp_reass_maxseg);
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VNET_DEFINE(int, tcp_reass_qsize);
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static VNET_DEFINE(int, tcp_reass_maxqlen);
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static VNET_DEFINE(int, tcp_reass_overflows);
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#define V_tcp_reass_maxseg VNET_GET(tcp_reass_maxseg)
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#define V_tcp_reass_maxqlen VNET_GET(tcp_reass_maxqlen)
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#define V_tcp_reass_overflows VNET_GET(tcp_reass_overflows)
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SYSCTL_NODE(_net_inet_tcp, OID_AUTO, reass, CTLFLAG_RW, 0,
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"TCP Segment Reassembly Queue");
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SYSCTL_VNET_INT(_net_inet_tcp_reass, OID_AUTO, maxsegments, CTLFLAG_RDTUN,
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&VNET_NAME(tcp_reass_maxseg), 0,
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"Global maximum number of TCP Segments in Reassembly Queue");
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SYSCTL_VNET_INT(_net_inet_tcp_reass, OID_AUTO, cursegments, CTLFLAG_RD,
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&VNET_NAME(tcp_reass_qsize), 0,
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"Global number of TCP Segments currently in Reassembly Queue");
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SYSCTL_VNET_INT(_net_inet_tcp_reass, OID_AUTO, maxqlen, CTLFLAG_RW,
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&VNET_NAME(tcp_reass_maxqlen), 0,
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"Maximum number of TCP Segments per individual Reassembly Queue");
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SYSCTL_VNET_INT(_net_inet_tcp_reass, OID_AUTO, overflows, CTLFLAG_RD,
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&VNET_NAME(tcp_reass_overflows), 0,
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"Global number of TCP Segment Reassembly Queue Overflows");
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/* Initialize TCP reassembly queue */
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static void
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tcp_reass_zone_change(void *tag)
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{
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V_tcp_reass_maxseg = nmbclusters / 16;
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uma_zone_set_max(V_tcp_reass_zone, V_tcp_reass_maxseg);
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}
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VNET_DEFINE(uma_zone_t, tcp_reass_zone);
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void
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tcp_reass_init(void)
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{
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V_tcp_reass_maxseg = 0;
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V_tcp_reass_qsize = 0;
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V_tcp_reass_maxqlen = 48;
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V_tcp_reass_overflows = 0;
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V_tcp_reass_maxseg = nmbclusters / 16;
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TUNABLE_INT_FETCH("net.inet.tcp.reass.maxsegments",
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&V_tcp_reass_maxseg);
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V_tcp_reass_zone = uma_zcreate("tcpreass", sizeof (struct tseg_qent),
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NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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uma_zone_set_max(V_tcp_reass_zone, V_tcp_reass_maxseg);
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EVENTHANDLER_REGISTER(nmbclusters_change,
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tcp_reass_zone_change, NULL, EVENTHANDLER_PRI_ANY);
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}
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int
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tcp_reass(struct tcpcb *tp, struct tcphdr *th, int *tlenp, struct mbuf *m)
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{
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struct tseg_qent *q;
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struct tseg_qent *p = NULL;
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struct tseg_qent *nq;
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struct tseg_qent *te = NULL;
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struct socket *so = tp->t_inpcb->inp_socket;
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int flags;
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INP_WLOCK_ASSERT(tp->t_inpcb);
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/*
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* XXX: tcp_reass() is rather inefficient with its data structures
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* and should be rewritten (see NetBSD for optimizations).
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*/
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/*
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* Call with th==NULL after become established to
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* force pre-ESTABLISHED data up to user socket.
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*/
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if (th == NULL)
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goto present;
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/*
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* Limit the number of segments in the reassembly queue to prevent
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* holding on to too many segments (and thus running out of mbufs).
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* Make sure to let the missing segment through which caused this
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* queue. Always keep one global queue entry spare to be able to
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* process the missing segment.
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*/
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if (th->th_seq != tp->rcv_nxt &&
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(V_tcp_reass_qsize + 1 >= V_tcp_reass_maxseg ||
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tp->t_segqlen >= V_tcp_reass_maxqlen)) {
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V_tcp_reass_overflows++;
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TCPSTAT_INC(tcps_rcvmemdrop);
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m_freem(m);
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*tlenp = 0;
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return (0);
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}
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/*
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* Allocate a new queue entry. If we can't, or hit the zone limit
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* just drop the pkt.
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*/
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te = uma_zalloc(V_tcp_reass_zone, M_NOWAIT);
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if (te == NULL) {
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TCPSTAT_INC(tcps_rcvmemdrop);
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m_freem(m);
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*tlenp = 0;
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return (0);
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}
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tp->t_segqlen++;
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V_tcp_reass_qsize++;
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/*
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* Find a segment which begins after this one does.
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*/
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LIST_FOREACH(q, &tp->t_segq, tqe_q) {
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if (SEQ_GT(q->tqe_th->th_seq, th->th_seq))
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break;
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p = q;
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}
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/*
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* If there is a preceding segment, it may provide some of
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* our data already. If so, drop the data from the incoming
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* segment. If it provides all of our data, drop us.
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*/
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if (p != NULL) {
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int i;
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/* conversion to int (in i) handles seq wraparound */
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i = p->tqe_th->th_seq + p->tqe_len - th->th_seq;
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if (i > 0) {
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if (i >= *tlenp) {
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TCPSTAT_INC(tcps_rcvduppack);
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TCPSTAT_ADD(tcps_rcvdupbyte, *tlenp);
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m_freem(m);
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uma_zfree(V_tcp_reass_zone, te);
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tp->t_segqlen--;
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V_tcp_reass_qsize--;
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/*
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* Try to present any queued data
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* at the left window edge to the user.
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* This is needed after the 3-WHS
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* completes.
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*/
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goto present; /* ??? */
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}
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m_adj(m, i);
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*tlenp -= i;
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th->th_seq += i;
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}
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}
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TCPSTAT_INC(tcps_rcvoopack);
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TCPSTAT_ADD(tcps_rcvoobyte, *tlenp);
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/*
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* While we overlap succeeding segments trim them or,
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* if they are completely covered, dequeue them.
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*/
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while (q) {
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int i = (th->th_seq + *tlenp) - q->tqe_th->th_seq;
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if (i <= 0)
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break;
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if (i < q->tqe_len) {
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q->tqe_th->th_seq += i;
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q->tqe_len -= i;
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m_adj(q->tqe_m, i);
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break;
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}
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nq = LIST_NEXT(q, tqe_q);
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LIST_REMOVE(q, tqe_q);
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m_freem(q->tqe_m);
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uma_zfree(V_tcp_reass_zone, q);
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tp->t_segqlen--;
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V_tcp_reass_qsize--;
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q = nq;
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}
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/* Insert the new segment queue entry into place. */
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te->tqe_m = m;
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te->tqe_th = th;
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te->tqe_len = *tlenp;
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if (p == NULL) {
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LIST_INSERT_HEAD(&tp->t_segq, te, tqe_q);
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} else {
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LIST_INSERT_AFTER(p, te, tqe_q);
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}
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present:
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/*
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* Present data to user, advancing rcv_nxt through
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* completed sequence space.
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*/
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if (!TCPS_HAVEESTABLISHED(tp->t_state))
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return (0);
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q = LIST_FIRST(&tp->t_segq);
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if (!q || q->tqe_th->th_seq != tp->rcv_nxt)
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return (0);
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SOCKBUF_LOCK(&so->so_rcv);
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do {
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tp->rcv_nxt += q->tqe_len;
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flags = q->tqe_th->th_flags & TH_FIN;
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nq = LIST_NEXT(q, tqe_q);
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LIST_REMOVE(q, tqe_q);
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if (so->so_rcv.sb_state & SBS_CANTRCVMORE)
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m_freem(q->tqe_m);
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else
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sbappendstream_locked(&so->so_rcv, q->tqe_m);
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uma_zfree(V_tcp_reass_zone, q);
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tp->t_segqlen--;
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V_tcp_reass_qsize--;
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q = nq;
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} while (q && q->tqe_th->th_seq == tp->rcv_nxt);
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ND6_HINT(tp);
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sorwakeup_locked(so);
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return (flags);
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}
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