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freebsd-dev/sys/net/if_mib.c

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/* -> /*- for license, minor formatting changes
2005-01-07 01:45:51 +00:00
/*-
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
* Copyright 1996 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. 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.
*
$Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00
* $FreeBSD$
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
These files were getting sys/malloc.h and vm/uma.h with header pollution via sys/mbuf.h
2016-02-01 17:41:21 +00:00
#include <sys/malloc.h>
Removed nested include if <sys/socket.h> from <net/if.h> and <net/if_arp.h> and fixed the things that depended on it. The nested include just allowed unportable programs to compile and made my simple #include checking program report that networking code doesn't need to include <sys/socket.h>.
1996-10-12 19:49:43 +00:00
#include <sys/socket.h>
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
#include <sys/sysctl.h>
#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>
ifnet/API: Move struct ifnet definition to a <net/if_private.h> Hide the ifnet structure definition, no user serviceable parts inside, it's a netstack implementation detail. Include it temporarily in <net/if_var.h> until all drivers are updated to use the accessors exclusively. Reviewed by: glebius Sponsored by: Juniper Networks, Inc. Differential Revision: https://reviews.freebsd.org/D38046
2023-01-13 15:43:51 +00:00
#include <net/if_private.h>
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
#include <net/if_mib.h>
Rather than using hidden includes (with cicular dependencies), directly include only the header files needed. This reduces the unneeded spamming of various headers into lots of files. For now, this leaves us with very few modules including vnet.h and thus needing to depend on opt_route.h. Reviewed by: brooks, gnn, des, zec, imp Sponsored by: The FreeBSD Foundation
2008-12-02 21:37:28 +00:00
#include <net/vnet.h>
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
/*
* A sysctl(3) MIB for generic interface information. This information
* is exported in the net.link.generic branch, which has the following
* structure:
*
* net.link.generic .system - system-wide control variables
* and statistics (node)
* .ifdata.<ifindex>.general
* - what's in `struct ifdata'
* plus some other info
* .ifdata.<ifindex>.linkspecific
* - a link-type-specific data
* structure (as might be used
* by an SNMP agent
*
* Perhaps someday we will make addresses accessible via this interface
* as well (then there will be four such...). The reason that the
* index comes before the last element in the name is because it
* seems more orthogonal that way, particularly with the possibility
* of other per-interface data living down here as well (e.g., integrated
* services stuff).
*/
static int
Previous commit changing SYSCTL_HANDLER_ARGS violated KNF. Pointed out by: bde
2000-07-04 11:25:35 +00:00
sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
{
int *name = (int *)arg1;
Replace the if_name and if_unit members of struct ifnet with new members if_xname, if_dname, and if_dunit. if_xname is the name of the interface and if_dname/unit are the driver name and instance. This change paves the way for interface renaming and enhanced pseudo device creation and configuration symantics. Approved By: re (in principle) Reviewed By: njl, imp Tested On: i386, amd64, sparc64 Obtained From: NetBSD (if_xname)
2003-10-31 18:32:15 +00:00
int error;
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
u_int namelen = arg2;
struct ifnet *ifp;
struct ifmibdata ifmd;
ifnet_byindex_ref() requires network epoch.
2019-10-09 16:21:50 +00:00
struct epoch_tracker et;
Add a new leaf to the net.link.generic.ifdata.%d sysctl to retrieve the name and unit number assigned by the driver. This is needed by SNMP to find interfaces after they have been renamed. MFC after: 4 weeks
2006-01-04 12:57:09 +00:00
size_t dlen;
char *dbuf;
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
if (namelen != 2)
return EINVAL;
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
if (name[0] <= 0)
return (ENOENT);
ifnet_byindex_ref() requires network epoch.
2019-10-09 16:21:50 +00:00
NET_EPOCH_ENTER(et);
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
ifp = ifnet_byindex_ref(name[0]);
ifnet_byindex_ref() requires network epoch.
2019-10-09 16:21:50 +00:00
NET_EPOCH_EXIT(et);
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
if (ifp == NULL)
return (ENOENT);
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
switch(name[1]) {
default:
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
error = ENOENT;
goto out;
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
case IFDATA_GENERAL:
If we are going to 1. Copy a NULL-terminated string into a fixed-length buffer, and 2. copyout that buffer to userland, we really ought to 0. Zero the entire buffer first. Security: FreeBSD-SA-05:08.kmem
2005-05-06 02:50:00 +00:00
bzero(&ifmd, sizeof(ifmd));
Replace the if_name and if_unit members of struct ifnet with new members if_xname, if_dname, and if_dunit. if_xname is the name of the interface and if_dname/unit are the driver name and instance. This change paves the way for interface renaming and enhanced pseudo device creation and configuration symantics. Approved By: re (in principle) Reviewed By: njl, imp Tested On: i386, amd64, sparc64 Obtained From: NetBSD (if_xname)
2003-10-31 18:32:15 +00:00
strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
o Remove struct if_data from struct ifnet. Now it is merely API structure for route(4) socket and ifmib(4) sysctl. o Move fields from if_data to ifnet, but keep all statistic counters separate, since they should disappear later. o Provide function if_data_copy() to fill if_data, utilize it in routing socket and ifmib handler. o Provide overridable ifnet(9) method to fetch counters. If no provided, if_get_counters_compat() would be used, that returns old counters. Sponsored by: Netflix Sponsored by: Nginx, Inc.
2014-08-31 06:46:21 +00:00
ifmd.ifmd_pcount = ifp->if_pcount;
if_data_copy(ifp, &ifmd.ifmd_data);
Before we export network interface data through the ifmibdata structure, OR the flags bits with the driver managed status flags. This fixes an issue where RUNNING flags would not be reported to processes, which conflicts with the flags information provided by ifconfig(8).
2005-10-23 01:44:08 +00:00
ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
Remove ifq_drops from struct ifqueue. Now queue drops are accounted in struct ifnet if_oqdrops. Some netgraph modules used ifqueue w/o ifnet. Accounting of queue drops is simply removed from them. There were no API to read this statistic. Sponsored by: Netflix Sponsored by: Nginx, Inc.
2014-09-19 09:01:19 +00:00
ifmd.ifmd_snd_drops =
ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS);
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
if (error)
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
goto out;
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
break;
case IFDATA_LINKSPECIFIC:
error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
if (error || !req->newptr)
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
goto out;
Add a missing break statement; IFDATA_LINKSPECIFIC would fall through to IFDATA_DRIVERNAME otherwise. Reviewed by: brooks MFC after: 1 week
2008-09-10 13:08:37 +00:00
break;
Add a new leaf to the net.link.generic.ifdata.%d sysctl to retrieve the name and unit number assigned by the driver. This is needed by SNMP to find interfaces after they have been renamed. MFC after: 4 weeks
2006-01-04 12:57:09 +00:00
case IFDATA_DRIVERNAME:
/* 20 is enough for 64bit ints */
dlen = strlen(ifp->if_dname) + 20 + 1;
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
error = ENOMEM;
goto out;
}
Add a new leaf to the net.link.generic.ifdata.%d sysctl to retrieve the name and unit number assigned by the driver. This is needed by SNMP to find interfaces after they have been renamed. MFC after: 4 weeks
2006-01-04 12:57:09 +00:00
if (ifp->if_dunit == IF_DUNIT_NONE)
strcpy(dbuf, ifp->if_dname);
else
sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
if (error == 0 && req->newptr != NULL)
error = EPERM;
free(dbuf, M_TEMP);
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
goto out;
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
}
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
out:
if_rele(ifp);
return error;
Add better support for retrieving management information from network interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
1996-07-30 19:17:07 +00:00
}
ifnet: make V_if_index static to if.c This requires moving net.link.generic sysctl declaration from if_mib.c to if.c. Ideally if_mib.c needs just to be merged to if.c, but they have different license texts. Differential revision: https://reviews.freebsd.org/D33263
2021-12-04 17:49:36 +00:00
SYSCTL_DECL(_net_link_generic);
Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes. This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags. Mark all obvious cases as MPSAFE. All entries that haven't been marked as MPSAFE before are by default marked as NEEDGIANT Approved by: kib (mentor, blanket) Commented by: kib, gallatin, melifaro Differential Revision: https://reviews.freebsd.org/D23718
2020-02-26 14:26:36 +00:00
static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata,
net.link.generic.ifdata.<ifindex>.linkspecific: rework handler This OID was added in r17352 but the write path of IFDATA_LINKSPECIFIC seems unused as there are no in-base writers, and as far as I can tell we had issues with this code before, see PR 219472. Drop the write path to make the handler read-only as described in comments and man-pages. It can be marked as MPSAFE now. Reviewed by: bdragon, kib, melifaro, wollman Approved by: kib (mentor) Sponsored by: Mysterious Code Ltd. Differential Revision: https://reviews.freebsd.org/D25348
2020-06-21 18:40:17 +00:00
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ifdata,
Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes. This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags. Mark all obvious cases as MPSAFE. All entries that haven't been marked as MPSAFE before are by default marked as NEEDGIANT Approved by: kib (mentor, blanket) Commented by: kib, gallatin, melifaro Differential Revision: https://reviews.freebsd.org/D23718
2020-02-26 14:26:36 +00:00
"Interface table");
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