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freebsd-dev/sys/netinet/igmp.c
Andrey V. Elsukov cc0a3c8ca4 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

3658 lines
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/*-
* Copyright (c) 2007-2009 Bruce Simpson.
* Copyright (c) 1988 Stephen Deering.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Stephen Deering of Stanford University.
*
* 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.
* 4. Neither the name of the University nor the names of its contributors
* 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.
*
* @(#)igmp.c 8.1 (Berkeley) 7/19/93
*/
/*
* Internet Group Management Protocol (IGMP) routines.
* [RFC1112, RFC2236, RFC3376]
*
* Written by Steve Deering, Stanford, May 1988.
* Modified by Rosen Sharma, Stanford, Aug 1994.
* Modified by Bill Fenner, Xerox PARC, Feb 1995.
* Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995.
* Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson.
*
* MULTICAST Revision: 3.5.1.4
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/rmlock.h>
#include <sys/sysctl.h>
#include <sys/ktr.h>
#include <sys/condvar.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/netisr.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_options.h>
#include <netinet/igmp.h>
#include <netinet/igmp_var.h>
#include <machine/in_cksum.h>
#include <security/mac/mac_framework.h>
#ifndef KTR_IGMPV3
#define KTR_IGMPV3 KTR_INET
#endif
static struct igmp_ifsoftc *
igi_alloc_locked(struct ifnet *);
static void igi_delete_locked(const struct ifnet *);
static void igmp_dispatch_queue(struct mbufq *, int, const int);
static void igmp_fasttimo_vnet(void);
static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *);
static int igmp_handle_state_change(struct in_multi *,
struct igmp_ifsoftc *);
static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *);
static int igmp_input_v1_query(struct ifnet *, const struct ip *,
const struct igmp *);
static int igmp_input_v2_query(struct ifnet *, const struct ip *,
const struct igmp *);
static int igmp_input_v3_query(struct ifnet *, const struct ip *,
/*const*/ struct igmpv3 *);
static int igmp_input_v3_group_query(struct in_multi *,
struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *);
static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *,
/*const*/ struct igmp *);
static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *,
/*const*/ struct igmp *);
static void igmp_intr(struct mbuf *);
static int igmp_isgroupreported(const struct in_addr);
static struct mbuf *
igmp_ra_alloc(void);
#ifdef KTR
static char * igmp_rec_type_to_str(const int);
#endif
static void igmp_set_version(struct igmp_ifsoftc *, const int);
static void igmp_slowtimo_vnet(void);
static int igmp_v1v2_queue_report(struct in_multi *, const int);
static void igmp_v1v2_process_group_timer(struct in_multi *, const int);
static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *);
static void igmp_v2_update_group(struct in_multi *, const int);
static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *);
static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *);
static struct mbuf *
igmp_v3_encap_report(struct ifnet *, struct mbuf *);
static int igmp_v3_enqueue_group_record(struct mbufq *,
struct in_multi *, const int, const int, const int);
static int igmp_v3_enqueue_filter_change(struct mbufq *,
struct in_multi *);
static void igmp_v3_process_group_timers(struct igmp_ifsoftc *,
struct mbufq *, struct mbufq *, struct in_multi *,
const int);
static int igmp_v3_merge_state_changes(struct in_multi *,
struct mbufq *);
static void igmp_v3_suppress_group_record(struct in_multi *);
static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS);
static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS);
static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS);
static const struct netisr_handler igmp_nh = {
.nh_name = "igmp",
.nh_handler = igmp_intr,
.nh_proto = NETISR_IGMP,
.nh_policy = NETISR_POLICY_SOURCE,
};
/*
* System-wide globals.
*
* Unlocked access to these is OK, except for the global IGMP output
* queue. The IGMP subsystem lock ends up being system-wide for the moment,
* because all VIMAGEs have to share a global output queue, as netisrs
* themselves are not virtualized.
*
* Locking:
* * The permitted lock order is: IN_MULTI_LOCK, IGMP_LOCK, IF_ADDR_LOCK.
* Any may be taken independently; if any are held at the same
* time, the above lock order must be followed.
* * All output is delegated to the netisr.
* Now that Giant has been eliminated, the netisr may be inlined.
* * IN_MULTI_LOCK covers in_multi.
* * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file,
* including the output queue.
* * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of
* per-link state iterators.
* * igmp_ifsoftc is valid as long as PF_INET is attached to the interface,
* therefore it is not refcounted.
* We allow unlocked reads of igmp_ifsoftc when accessed via in_multi.
*
* Reference counting
* * IGMP acquires its own reference every time an in_multi is passed to
* it and the group is being joined for the first time.
* * IGMP releases its reference(s) on in_multi in a deferred way,
* because the operations which process the release run as part of
* a loop whose control variables are directly affected by the release
* (that, and not recursing on the IF_ADDR_LOCK).
*
* VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds
* to a vnet in ifp->if_vnet.
*
* SMPng: XXX We may potentially race operations on ifma_protospec.
* The problem is that we currently lack a clean way of taking the
* IF_ADDR_LOCK() between the ifnet and in layers w/o recursing,
* as anything which modifies ifma needs to be covered by that lock.
* So check for ifma_protospec being NULL before proceeding.
*/
struct mtx igmp_mtx;
struct mbuf *m_raopt; /* Router Alert option */
static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state");
/*
* VIMAGE-wide globals.
*
* The IGMPv3 timers themselves need to run per-image, however,
* protosw timers run globally (see tcp).
* An ifnet can only be in one vimage at a time, and the loopback
* ifnet, loif, is itself virtualized.
* It would otherwise be possible to seriously hose IGMP state,
* and create inconsistencies in upstream multicast routing, if you have
* multiple VIMAGEs running on the same link joining different multicast
* groups, UNLESS the "primary IP address" is different. This is because
* IGMP for IPv4 does not force link-local addresses to be used for each
* node, unlike MLD for IPv6.
* Obviously the IGMPv3 per-interface state has per-vimage granularity
* also as a result.
*
* FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection
* policy to control the address used by IGMP on the link.
*/
static VNET_DEFINE(int, interface_timers_running); /* IGMPv3 general
* query response */
static VNET_DEFINE(int, state_change_timers_running); /* IGMPv3 state-change
* retransmit */
static VNET_DEFINE(int, current_state_timers_running); /* IGMPv1/v2 host
* report; IGMPv3 g/sg
* query response */
#define V_interface_timers_running VNET(interface_timers_running)
#define V_state_change_timers_running VNET(state_change_timers_running)
#define V_current_state_timers_running VNET(current_state_timers_running)
static VNET_DEFINE(LIST_HEAD(, igmp_ifsoftc), igi_head);
static VNET_DEFINE(struct igmpstat, igmpstat) = {
.igps_version = IGPS_VERSION_3,
.igps_len = sizeof(struct igmpstat),
};
static VNET_DEFINE(struct timeval, igmp_gsrdelay) = {10, 0};
#define V_igi_head VNET(igi_head)
#define V_igmpstat VNET(igmpstat)
#define V_igmp_gsrdelay VNET(igmp_gsrdelay)
static VNET_DEFINE(int, igmp_recvifkludge) = 1;
static VNET_DEFINE(int, igmp_sendra) = 1;
static VNET_DEFINE(int, igmp_sendlocal) = 1;
static VNET_DEFINE(int, igmp_v1enable) = 1;
static VNET_DEFINE(int, igmp_v2enable) = 1;
static VNET_DEFINE(int, igmp_legacysupp);
static VNET_DEFINE(int, igmp_default_version) = IGMP_VERSION_3;
#define V_igmp_recvifkludge VNET(igmp_recvifkludge)
#define V_igmp_sendra VNET(igmp_sendra)
#define V_igmp_sendlocal VNET(igmp_sendlocal)
#define V_igmp_v1enable VNET(igmp_v1enable)
#define V_igmp_v2enable VNET(igmp_v2enable)
#define V_igmp_legacysupp VNET(igmp_legacysupp)
#define V_igmp_default_version VNET(igmp_default_version)
/*
* Virtualized sysctls.
*/
SYSCTL_STRUCT(_net_inet_igmp, IGMPCTL_STATS, stats, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(igmpstat), igmpstat, "");
SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(igmp_recvifkludge), 0,
"Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address");
SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(igmp_sendra), 0,
"Send IP Router Alert option in IGMPv2/v3 messages");
SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(igmp_sendlocal), 0,
"Send IGMP membership reports for 224.0.0.0/24 groups");
SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(igmp_v1enable), 0,
"Enable backwards compatibility with IGMPv1");
SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(igmp_v2enable), 0,
"Enable backwards compatibility with IGMPv2");
SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(igmp_legacysupp), 0,
"Allow v1/v2 reports to suppress v3 group responses");
SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I",
"Default version of IGMP to run on each interface");
SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I",
"Rate limit for IGMPv3 Group-and-Source queries in seconds");
/*
* Non-virtualized sysctls.
*/
static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo,
CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo,
"Per-interface IGMPv3 state");
static __inline void
igmp_save_context(struct mbuf *m, struct ifnet *ifp)
{
#ifdef VIMAGE
m->m_pkthdr.PH_loc.ptr = ifp->if_vnet;
#endif /* VIMAGE */
m->m_pkthdr.flowid = ifp->if_index;
}
static __inline void
igmp_scrub_context(struct mbuf *m)
{
m->m_pkthdr.PH_loc.ptr = NULL;
m->m_pkthdr.flowid = 0;
}
#ifdef KTR
static __inline char *
inet_ntoa_haddr(in_addr_t haddr)
{
struct in_addr ia;
ia.s_addr = htonl(haddr);
return (inet_ntoa(ia));
}
#endif
/*
* Restore context from a queued IGMP output chain.
* Return saved ifindex.
*
* VIMAGE: The assertion is there to make sure that we
* actually called CURVNET_SET() with what's in the mbuf chain.
*/
static __inline uint32_t
igmp_restore_context(struct mbuf *m)
{
#ifdef notyet
#if defined(VIMAGE) && defined(INVARIANTS)
KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr),
("%s: called when curvnet was not restored", __func__));
#endif
#endif
return (m->m_pkthdr.flowid);
}
/*
* Retrieve or set default IGMP version.
*
* VIMAGE: Assume curvnet set by caller.
* SMPng: NOTE: Serialized by IGMP lock.
*/
static int
sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS)
{
int error;
int new;
error = sysctl_wire_old_buffer(req, sizeof(int));
if (error)
return (error);
IGMP_LOCK();
new = V_igmp_default_version;
error = sysctl_handle_int(oidp, &new, 0, req);
if (error || !req->newptr)
goto out_locked;
if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) {
error = EINVAL;
goto out_locked;
}
CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d",
V_igmp_default_version, new);
V_igmp_default_version = new;
out_locked:
IGMP_UNLOCK();
return (error);
}
/*
* Retrieve or set threshold between group-source queries in seconds.
*
* VIMAGE: Assume curvnet set by caller.
* SMPng: NOTE: Serialized by IGMP lock.
*/
static int
sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS)
{
int error;
int i;
error = sysctl_wire_old_buffer(req, sizeof(int));
if (error)
return (error);
IGMP_LOCK();
i = V_igmp_gsrdelay.tv_sec;
error = sysctl_handle_int(oidp, &i, 0, req);
if (error || !req->newptr)
goto out_locked;
if (i < -1 || i >= 60) {
error = EINVAL;
goto out_locked;
}
CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d",
V_igmp_gsrdelay.tv_sec, i);
V_igmp_gsrdelay.tv_sec = i;
out_locked:
IGMP_UNLOCK();
return (error);
}
/*
* Expose struct igmp_ifsoftc to userland, keyed by ifindex.
* For use by ifmcstat(8).
*
* SMPng: NOTE: Does an unlocked ifindex space read.
* VIMAGE: Assume curvnet set by caller. The node handler itself
* is not directly virtualized.
*/
static int
sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS)
{
int *name;
int error;
u_int namelen;
struct ifnet *ifp;
struct igmp_ifsoftc *igi;
name = (int *)arg1;
namelen = arg2;
if (req->newptr != NULL)
return (EPERM);
if (namelen != 1)
return (EINVAL);
error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo));
if (error)
return (error);
IN_MULTI_LOCK();
IGMP_LOCK();
if (name[0] <= 0 || name[0] > V_if_index) {
error = ENOENT;
goto out_locked;
}
error = ENOENT;
ifp = ifnet_byindex(name[0]);
if (ifp == NULL)
goto out_locked;
LIST_FOREACH(igi, &V_igi_head, igi_link) {
if (ifp == igi->igi_ifp) {
struct igmp_ifinfo info;
info.igi_version = igi->igi_version;
info.igi_v1_timer = igi->igi_v1_timer;
info.igi_v2_timer = igi->igi_v2_timer;
info.igi_v3_timer = igi->igi_v3_timer;
info.igi_flags = igi->igi_flags;
info.igi_rv = igi->igi_rv;
info.igi_qi = igi->igi_qi;
info.igi_qri = igi->igi_qri;
info.igi_uri = igi->igi_uri;
error = SYSCTL_OUT(req, &info, sizeof(info));
break;
}
}
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
return (error);
}
/*
* Dispatch an entire queue of pending packet chains
* using the netisr.
* VIMAGE: Assumes the vnet pointer has been set.
*/
static void
igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop)
{
struct mbuf *m;
while ((m = mbufq_dequeue(mq)) != NULL) {
CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m);
if (loop)
m->m_flags |= M_IGMP_LOOP;
netisr_dispatch(NETISR_IGMP, m);
if (--limit == 0)
break;
}
}
/*
* Filter outgoing IGMP report state by group.
*
* Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1).
* If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are
* disabled for all groups in the 224.0.0.0/24 link-local scope. However,
* this may break certain IGMP snooping switches which rely on the old
* report behaviour.
*
* Return zero if the given group is one for which IGMP reports
* should be suppressed, or non-zero if reports should be issued.
*/
static __inline int
igmp_isgroupreported(const struct in_addr addr)
{
if (in_allhosts(addr) ||
((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr)))))
return (0);
return (1);
}
/*
* Construct a Router Alert option to use in outgoing packets.
*/
static struct mbuf *
igmp_ra_alloc(void)
{
struct mbuf *m;
struct ipoption *p;
m = m_get(M_WAITOK, MT_DATA);
p = mtod(m, struct ipoption *);
p->ipopt_dst.s_addr = INADDR_ANY;
p->ipopt_list[0] = IPOPT_RA; /* Router Alert Option */
p->ipopt_list[1] = 0x04; /* 4 bytes long */
p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */
p->ipopt_list[3] = 0x00; /* pad byte */
m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1];
return (m);
}
/*
* Attach IGMP when PF_INET is attached to an interface.
*/
struct igmp_ifsoftc *
igmp_domifattach(struct ifnet *ifp)
{
struct igmp_ifsoftc *igi;
CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)",
__func__, ifp, ifp->if_xname);
IGMP_LOCK();
igi = igi_alloc_locked(ifp);
if (!(ifp->if_flags & IFF_MULTICAST))
igi->igi_flags |= IGIF_SILENT;
IGMP_UNLOCK();
return (igi);
}
/*
* VIMAGE: assume curvnet set by caller.
*/
static struct igmp_ifsoftc *
igi_alloc_locked(/*const*/ struct ifnet *ifp)
{
struct igmp_ifsoftc *igi;
IGMP_LOCK_ASSERT();
igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO);
if (igi == NULL)
goto out;
igi->igi_ifp = ifp;
igi->igi_version = V_igmp_default_version;
igi->igi_flags = 0;
igi->igi_rv = IGMP_RV_INIT;
igi->igi_qi = IGMP_QI_INIT;
igi->igi_qri = IGMP_QRI_INIT;
igi->igi_uri = IGMP_URI_INIT;
SLIST_INIT(&igi->igi_relinmhead);
mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS);
LIST_INSERT_HEAD(&V_igi_head, igi, igi_link);
CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)",
ifp, ifp->if_xname);
out:
return (igi);
}
/*
* Hook for ifdetach.
*
* NOTE: Some finalization tasks need to run before the protocol domain
* is detached, but also before the link layer does its cleanup.
*
* SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK().
* XXX This is also bitten by unlocked ifma_protospec access.
*/
void
igmp_ifdetach(struct ifnet *ifp)
{
struct igmp_ifsoftc *igi;
struct ifmultiaddr *ifma;
struct in_multi *inm, *tinm;
CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp,
ifp->if_xname);
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
if (igi->igi_version == IGMP_VERSION_3) {
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
#if 0
KASSERT(ifma->ifma_protospec != NULL,
("%s: ifma_protospec is NULL", __func__));
#endif
inm = (struct in_multi *)ifma->ifma_protospec;
if (inm->inm_state == IGMP_LEAVING_MEMBER) {
SLIST_INSERT_HEAD(&igi->igi_relinmhead,
inm, inm_nrele);
}
inm_clear_recorded(inm);
}
IF_ADDR_RUNLOCK(ifp);
/*
* Free the in_multi reference(s) for this IGMP lifecycle.
*/
SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, inm_nrele,
tinm) {
SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele);
inm_release_locked(inm);
}
}
IGMP_UNLOCK();
}
/*
* Hook for domifdetach.
*/
void
igmp_domifdetach(struct ifnet *ifp)
{
struct igmp_ifsoftc *igi;
CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)",
__func__, ifp, ifp->if_xname);
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
igi_delete_locked(ifp);
IGMP_UNLOCK();
}
static void
igi_delete_locked(const struct ifnet *ifp)
{
struct igmp_ifsoftc *igi, *tigi;
CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)",
__func__, ifp, ifp->if_xname);
IGMP_LOCK_ASSERT();
LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) {
if (igi->igi_ifp == ifp) {
/*
* Free deferred General Query responses.
*/
mbufq_drain(&igi->igi_gq);
LIST_REMOVE(igi, igi_link);
KASSERT(SLIST_EMPTY(&igi->igi_relinmhead),
("%s: there are dangling in_multi references",
__func__));
free(igi, M_IGMP);
return;
}
}
#ifdef INVARIANTS
panic("%s: igmp_ifsoftc not found for ifp %p\n", __func__, ifp);
#endif
}
/*
* Process a received IGMPv1 query.
* Return non-zero if the message should be dropped.
*
* VIMAGE: The curvnet pointer is derived from the input ifp.
*/
static int
igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip,
const struct igmp *igmp)
{
struct ifmultiaddr *ifma;
struct igmp_ifsoftc *igi;
struct in_multi *inm;
/*
* IGMPv1 Host Mmembership Queries SHOULD always be addressed to
* 224.0.0.1. They are always treated as General Queries.
* igmp_group is always ignored. Do not drop it as a userland
* daemon may wish to see it.
* XXX SMPng: unlocked increments in igmpstat assumed atomic.
*/
if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) {
IGMPSTAT_INC(igps_rcv_badqueries);
return (0);
}
IGMPSTAT_INC(igps_rcv_gen_queries);
IN_MULTI_LOCK();
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp));
if (igi->igi_flags & IGIF_LOOPBACK) {
CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)",
ifp, ifp->if_xname);
goto out_locked;
}
/*
* Switch to IGMPv1 host compatibility mode.
*/
igmp_set_version(igi, IGMP_VERSION_1);
CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname);
/*
* Start the timers in all of our group records
* for the interface on which the query arrived,
* except those which are already running.
*/
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
if (inm->inm_timer != 0)
continue;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_REPORTING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
inm->inm_state = IGMP_REPORTING_MEMBER;
inm->inm_timer = IGMP_RANDOM_DELAY(
IGMP_V1V2_MAX_RI * PR_FASTHZ);
V_current_state_timers_running = 1;
break;
case IGMP_LEAVING_MEMBER:
break;
}
}
IF_ADDR_RUNLOCK(ifp);
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
return (0);
}
/*
* Process a received IGMPv2 general or group-specific query.
*/
static int
igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip,
const struct igmp *igmp)
{
struct ifmultiaddr *ifma;
struct igmp_ifsoftc *igi;
struct in_multi *inm;
int is_general_query;
uint16_t timer;
is_general_query = 0;
/*
* Validate address fields upfront.
* XXX SMPng: unlocked increments in igmpstat assumed atomic.
*/
if (in_nullhost(igmp->igmp_group)) {
/*
* IGMPv2 General Query.
* If this was not sent to the all-hosts group, ignore it.
*/
if (!in_allhosts(ip->ip_dst))
return (0);
IGMPSTAT_INC(igps_rcv_gen_queries);
is_general_query = 1;
} else {
/* IGMPv2 Group-Specific Query. */
IGMPSTAT_INC(igps_rcv_group_queries);
}
IN_MULTI_LOCK();
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp));
if (igi->igi_flags & IGIF_LOOPBACK) {
CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)",
ifp, ifp->if_xname);
goto out_locked;
}
/*
* Ignore v2 query if in v1 Compatibility Mode.
*/
if (igi->igi_version == IGMP_VERSION_1)
goto out_locked;
igmp_set_version(igi, IGMP_VERSION_2);
timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE;
if (timer == 0)
timer = 1;
if (is_general_query) {
/*
* For each reporting group joined on this
* interface, kick the report timer.
*/
CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)",
ifp, ifp->if_xname);
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
igmp_v2_update_group(inm, timer);
}
IF_ADDR_RUNLOCK(ifp);
} else {
/*
* Group-specific IGMPv2 query, we need only
* look up the single group to process it.
*/
inm = inm_lookup(ifp, igmp->igmp_group);
if (inm != NULL) {
CTR3(KTR_IGMPV3, "process v2 query %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
igmp_v2_update_group(inm, timer);
}
}
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
return (0);
}
/*
* Update the report timer on a group in response to an IGMPv2 query.
*
* If we are becoming the reporting member for this group, start the timer.
* If we already are the reporting member for this group, and timer is
* below the threshold, reset it.
*
* We may be updating the group for the first time since we switched
* to IGMPv3. If we are, then we must clear any recorded source lists,
* and transition to REPORTING state; the group timer is overloaded
* for group and group-source query responses.
*
* Unlike IGMPv3, the delay per group should be jittered
* to avoid bursts of IGMPv2 reports.
*/
static void
igmp_v2_update_group(struct in_multi *inm, const int timer)
{
CTR4(KTR_IGMPV3, "%s: %s/%s timer=%d", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname, timer);
IN_MULTI_LOCK_ASSERT();
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
break;
case IGMP_REPORTING_MEMBER:
if (inm->inm_timer != 0 &&
inm->inm_timer <= timer) {
CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, "
"skipping.", __func__);
break;
}
/* FALLTHROUGH */
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_AWAKENING_MEMBER:
CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__);
inm->inm_state = IGMP_REPORTING_MEMBER;
inm->inm_timer = IGMP_RANDOM_DELAY(timer);
V_current_state_timers_running = 1;
break;
case IGMP_SLEEPING_MEMBER:
CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__);
inm->inm_state = IGMP_AWAKENING_MEMBER;
break;
case IGMP_LEAVING_MEMBER:
break;
}
}
/*
* Process a received IGMPv3 general, group-specific or
* group-and-source-specific query.
* Assumes m has already been pulled up to the full IGMP message length.
* Return 0 if successful, otherwise an appropriate error code is returned.
*/
static int
igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
/*const*/ struct igmpv3 *igmpv3)
{
struct igmp_ifsoftc *igi;
struct in_multi *inm;
int is_general_query;
uint32_t maxresp, nsrc, qqi;
uint16_t timer;
uint8_t qrv;
is_general_query = 0;
CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname);
maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */
if (maxresp >= 128) {
maxresp = IGMP_MANT(igmpv3->igmp_code) <<
(IGMP_EXP(igmpv3->igmp_code) + 3);
}
/*
* Robustness must never be less than 2 for on-wire IGMPv3.
* FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make
* an exception for interfaces whose IGMPv3 state changes
* are redirected to loopback (e.g. MANET).
*/
qrv = IGMP_QRV(igmpv3->igmp_misc);
if (qrv < 2) {
CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__,
qrv, IGMP_RV_INIT);
qrv = IGMP_RV_INIT;
}
qqi = igmpv3->igmp_qqi;
if (qqi >= 128) {
qqi = IGMP_MANT(igmpv3->igmp_qqi) <<
(IGMP_EXP(igmpv3->igmp_qqi) + 3);
}
timer = maxresp * PR_FASTHZ / IGMP_TIMER_SCALE;
if (timer == 0)
timer = 1;
nsrc = ntohs(igmpv3->igmp_numsrc);
/*
* Validate address fields and versions upfront before
* accepting v3 query.
* XXX SMPng: Unlocked access to igmpstat counters here.
*/
if (in_nullhost(igmpv3->igmp_group)) {
/*
* IGMPv3 General Query.
*
* General Queries SHOULD be directed to 224.0.0.1.
* A general query with a source list has undefined
* behaviour; discard it.
*/
IGMPSTAT_INC(igps_rcv_gen_queries);
if (!in_allhosts(ip->ip_dst) || nsrc > 0) {
IGMPSTAT_INC(igps_rcv_badqueries);
return (0);
}
is_general_query = 1;
} else {
/* Group or group-source specific query. */
if (nsrc == 0)
IGMPSTAT_INC(igps_rcv_group_queries);
else
IGMPSTAT_INC(igps_rcv_gsr_queries);
}
IN_MULTI_LOCK();
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp));
if (igi->igi_flags & IGIF_LOOPBACK) {
CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)",
ifp, ifp->if_xname);
goto out_locked;
}
/*
* Discard the v3 query if we're in Compatibility Mode.
* The RFC is not obviously worded that hosts need to stay in
* compatibility mode until the Old Version Querier Present
* timer expires.
*/
if (igi->igi_version != IGMP_VERSION_3) {
CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)",
igi->igi_version, ifp, ifp->if_xname);
goto out_locked;
}
igmp_set_version(igi, IGMP_VERSION_3);
igi->igi_rv = qrv;
igi->igi_qi = qqi;
igi->igi_qri = maxresp;
CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi,
maxresp);
if (is_general_query) {
/*
* Schedule a current-state report on this ifp for
* all groups, possibly containing source lists.
* If there is a pending General Query response
* scheduled earlier than the selected delay, do
* not schedule any other reports.
* Otherwise, reset the interface timer.
*/
CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)",
ifp, ifp->if_xname);
if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) {
igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer);
V_interface_timers_running = 1;
}
} else {
/*
* Group-source-specific queries are throttled on
* a per-group basis to defeat denial-of-service attempts.
* Queries for groups we are not a member of on this
* link are simply ignored.
*/
inm = inm_lookup(ifp, igmpv3->igmp_group);
if (inm == NULL)
goto out_locked;
if (nsrc > 0) {
if (!ratecheck(&inm->inm_lastgsrtv,
&V_igmp_gsrdelay)) {
CTR1(KTR_IGMPV3, "%s: GS query throttled.",
__func__);
IGMPSTAT_INC(igps_drop_gsr_queries);
goto out_locked;
}
}
CTR3(KTR_IGMPV3, "process v3 %s query on ifp %p(%s)",
inet_ntoa(igmpv3->igmp_group), ifp, ifp->if_xname);
/*
* If there is a pending General Query response
* scheduled sooner than the selected delay, no
* further report need be scheduled.
* Otherwise, prepare to respond to the
* group-specific or group-and-source query.
*/
if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer)
igmp_input_v3_group_query(inm, igi, timer, igmpv3);
}
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
return (0);
}
/*
* Process a recieved IGMPv3 group-specific or group-and-source-specific
* query.
* Return <0 if any error occured. Currently this is ignored.
*/
static int
igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi,
int timer, /*const*/ struct igmpv3 *igmpv3)
{
int retval;
uint16_t nsrc;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
retval = 0;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_AWAKENING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LEAVING_MEMBER:
return (retval);
break;
case IGMP_REPORTING_MEMBER:
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
break;
}
nsrc = ntohs(igmpv3->igmp_numsrc);
/*
* Deal with group-specific queries upfront.
* If any group query is already pending, purge any recorded
* source-list state if it exists, and schedule a query response
* for this group-specific query.
*/
if (nsrc == 0) {
if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER ||
inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) {
inm_clear_recorded(inm);
timer = min(inm->inm_timer, timer);
}
inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER;
inm->inm_timer = IGMP_RANDOM_DELAY(timer);
V_current_state_timers_running = 1;
return (retval);
}
/*
* Deal with the case where a group-and-source-specific query has
* been received but a group-specific query is already pending.
*/
if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) {
timer = min(inm->inm_timer, timer);
inm->inm_timer = IGMP_RANDOM_DELAY(timer);
V_current_state_timers_running = 1;
return (retval);
}
/*
* Finally, deal with the case where a group-and-source-specific
* query has been received, where a response to a previous g-s-r
* query exists, or none exists.
* In this case, we need to parse the source-list which the Querier
* has provided us with and check if we have any source list filter
* entries at T1 for these sources. If we do not, there is no need
* schedule a report and the query may be dropped.
* If we do, we must record them and schedule a current-state
* report for those sources.
* FIXME: Handling source lists larger than 1 mbuf requires that
* we pass the mbuf chain pointer down to this function, and use
* m_getptr() to walk the chain.
*/
if (inm->inm_nsrc > 0) {
const struct in_addr *ap;
int i, nrecorded;
ap = (const struct in_addr *)(igmpv3 + 1);
nrecorded = 0;
for (i = 0; i < nsrc; i++, ap++) {
retval = inm_record_source(inm, ap->s_addr);
if (retval < 0)
break;
nrecorded += retval;
}
if (nrecorded > 0) {
CTR1(KTR_IGMPV3,
"%s: schedule response to SG query", __func__);
inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER;
inm->inm_timer = IGMP_RANDOM_DELAY(timer);
V_current_state_timers_running = 1;
}
}
return (retval);
}
/*
* Process a received IGMPv1 host membership report.
*
* NOTE: 0.0.0.0 workaround breaks const correctness.
*/
static int
igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip,
/*const*/ struct igmp *igmp)
{
struct rm_priotracker in_ifa_tracker;
struct in_ifaddr *ia;
struct in_multi *inm;
IGMPSTAT_INC(igps_rcv_reports);
if (ifp->if_flags & IFF_LOOPBACK)
return (0);
if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) ||
!in_hosteq(igmp->igmp_group, ip->ip_dst)) {
IGMPSTAT_INC(igps_rcv_badreports);
return (EINVAL);
}
/*
* RFC 3376, Section 4.2.13, 9.2, 9.3:
* Booting clients may use the source address 0.0.0.0. Some
* IGMP daemons may not know how to use IP_RECVIF to determine
* the interface upon which this message was received.
* Replace 0.0.0.0 with the subnet address if told to do so.
*/
if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) {
IFP_TO_IA(ifp, ia, &in_ifa_tracker);
if (ia != NULL) {
ip->ip_src.s_addr = htonl(ia->ia_subnet);
ifa_free(&ia->ia_ifa);
}
}
CTR3(KTR_IGMPV3, "process v1 report %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
/*
* IGMPv1 report suppression.
* If we are a member of this group, and our membership should be
* reported, stop our group timer and transition to the 'lazy' state.
*/
IN_MULTI_LOCK();
inm = inm_lookup(ifp, igmp->igmp_group);
if (inm != NULL) {
struct igmp_ifsoftc *igi;
igi = inm->inm_igi;
if (igi == NULL) {
KASSERT(igi != NULL,
("%s: no igi for ifp %p", __func__, ifp));
goto out_locked;
}
IGMPSTAT_INC(igps_rcv_ourreports);
/*
* If we are in IGMPv3 host mode, do not allow the
* other host's IGMPv1 report to suppress our reports
* unless explicitly configured to do so.
*/
if (igi->igi_version == IGMP_VERSION_3) {
if (V_igmp_legacysupp)
igmp_v3_suppress_group_record(inm);
goto out_locked;
}
inm->inm_timer = 0;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
break;
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_AWAKENING_MEMBER:
CTR3(KTR_IGMPV3,
"report suppressed for %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
case IGMP_SLEEPING_MEMBER:
inm->inm_state = IGMP_SLEEPING_MEMBER;
break;
case IGMP_REPORTING_MEMBER:
CTR3(KTR_IGMPV3,
"report suppressed for %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
if (igi->igi_version == IGMP_VERSION_1)
inm->inm_state = IGMP_LAZY_MEMBER;
else if (igi->igi_version == IGMP_VERSION_2)
inm->inm_state = IGMP_SLEEPING_MEMBER;
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_LEAVING_MEMBER:
break;
}
}
out_locked:
IN_MULTI_UNLOCK();
return (0);
}
/*
* Process a received IGMPv2 host membership report.
*
* NOTE: 0.0.0.0 workaround breaks const correctness.
*/
static int
igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip,
/*const*/ struct igmp *igmp)
{
struct rm_priotracker in_ifa_tracker;
struct in_ifaddr *ia;
struct in_multi *inm;
/*
* Make sure we don't hear our own membership report. Fast
* leave requires knowing that we are the only member of a
* group.
*/
IFP_TO_IA(ifp, ia, &in_ifa_tracker);
if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) {
ifa_free(&ia->ia_ifa);
return (0);
}
IGMPSTAT_INC(igps_rcv_reports);
if (ifp->if_flags & IFF_LOOPBACK) {
if (ia != NULL)
ifa_free(&ia->ia_ifa);
return (0);
}
if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) ||
!in_hosteq(igmp->igmp_group, ip->ip_dst)) {
if (ia != NULL)
ifa_free(&ia->ia_ifa);
IGMPSTAT_INC(igps_rcv_badreports);
return (EINVAL);
}
/*
* RFC 3376, Section 4.2.13, 9.2, 9.3:
* Booting clients may use the source address 0.0.0.0. Some
* IGMP daemons may not know how to use IP_RECVIF to determine
* the interface upon which this message was received.
* Replace 0.0.0.0 with the subnet address if told to do so.
*/
if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) {
if (ia != NULL)
ip->ip_src.s_addr = htonl(ia->ia_subnet);
}
if (ia != NULL)
ifa_free(&ia->ia_ifa);
CTR3(KTR_IGMPV3, "process v2 report %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
/*
* IGMPv2 report suppression.
* If we are a member of this group, and our membership should be
* reported, and our group timer is pending or about to be reset,
* stop our group timer by transitioning to the 'lazy' state.
*/
IN_MULTI_LOCK();
inm = inm_lookup(ifp, igmp->igmp_group);
if (inm != NULL) {
struct igmp_ifsoftc *igi;
igi = inm->inm_igi;
KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp));
IGMPSTAT_INC(igps_rcv_ourreports);
/*
* If we are in IGMPv3 host mode, do not allow the
* other host's IGMPv1 report to suppress our reports
* unless explicitly configured to do so.
*/
if (igi->igi_version == IGMP_VERSION_3) {
if (V_igmp_legacysupp)
igmp_v3_suppress_group_record(inm);
goto out_locked;
}
inm->inm_timer = 0;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_SLEEPING_MEMBER:
break;
case IGMP_REPORTING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_AWAKENING_MEMBER:
CTR3(KTR_IGMPV3,
"report suppressed for %s on ifp %p(%s)",
inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
case IGMP_LAZY_MEMBER:
inm->inm_state = IGMP_LAZY_MEMBER;
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_LEAVING_MEMBER:
break;
}
}
out_locked:
IN_MULTI_UNLOCK();
return (0);
}
int
igmp_input(struct mbuf **mp, int *offp, int proto)
{
int iphlen;
struct ifnet *ifp;
struct igmp *igmp;
struct ip *ip;
struct mbuf *m;
int igmplen;
int minlen;
int queryver;
CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp);
m = *mp;
ifp = m->m_pkthdr.rcvif;
*mp = NULL;
IGMPSTAT_INC(igps_rcv_total);
ip = mtod(m, struct ip *);
iphlen = *offp;
igmplen = ntohs(ip->ip_len) - iphlen;
/*
* Validate lengths.
*/
if (igmplen < IGMP_MINLEN) {
IGMPSTAT_INC(igps_rcv_tooshort);
m_freem(m);
return (IPPROTO_DONE);
}
/*
* Always pullup to the minimum size for v1/v2 or v3
* to amortize calls to m_pullup().
*/
minlen = iphlen;
if (igmplen >= IGMP_V3_QUERY_MINLEN)
minlen += IGMP_V3_QUERY_MINLEN;
else
minlen += IGMP_MINLEN;
if ((!M_WRITABLE(m) || m->m_len < minlen) &&
(m = m_pullup(m, minlen)) == 0) {
IGMPSTAT_INC(igps_rcv_tooshort);
return (IPPROTO_DONE);
}
ip = mtod(m, struct ip *);
/*
* Validate checksum.
*/
m->m_data += iphlen;
m->m_len -= iphlen;
igmp = mtod(m, struct igmp *);
if (in_cksum(m, igmplen)) {
IGMPSTAT_INC(igps_rcv_badsum);
m_freem(m);
return (IPPROTO_DONE);
}
m->m_data -= iphlen;
m->m_len += iphlen;
/*
* IGMP control traffic is link-scope, and must have a TTL of 1.
* DVMRP traffic (e.g. mrinfo, mtrace) is an exception;
* probe packets may come from beyond the LAN.
*/
if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) {
IGMPSTAT_INC(igps_rcv_badttl);
m_freem(m);
return (IPPROTO_DONE);
}
switch (igmp->igmp_type) {
case IGMP_HOST_MEMBERSHIP_QUERY:
if (igmplen == IGMP_MINLEN) {
if (igmp->igmp_code == 0)
queryver = IGMP_VERSION_1;
else
queryver = IGMP_VERSION_2;
} else if (igmplen >= IGMP_V3_QUERY_MINLEN) {
queryver = IGMP_VERSION_3;
} else {
IGMPSTAT_INC(igps_rcv_tooshort);
m_freem(m);
return (IPPROTO_DONE);
}
switch (queryver) {
case IGMP_VERSION_1:
IGMPSTAT_INC(igps_rcv_v1v2_queries);
if (!V_igmp_v1enable)
break;
if (igmp_input_v1_query(ifp, ip, igmp) != 0) {
m_freem(m);
return (IPPROTO_DONE);
}
break;
case IGMP_VERSION_2:
IGMPSTAT_INC(igps_rcv_v1v2_queries);
if (!V_igmp_v2enable)
break;
if (igmp_input_v2_query(ifp, ip, igmp) != 0) {
m_freem(m);
return (IPPROTO_DONE);
}
break;
case IGMP_VERSION_3: {
struct igmpv3 *igmpv3;
uint16_t igmpv3len;
uint16_t nsrc;
IGMPSTAT_INC(igps_rcv_v3_queries);
igmpv3 = (struct igmpv3 *)igmp;
/*
* Validate length based on source count.
*/
nsrc = ntohs(igmpv3->igmp_numsrc);
if (nsrc * sizeof(in_addr_t) >
UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) {
IGMPSTAT_INC(igps_rcv_tooshort);
return (IPPROTO_DONE);
}
/*
* m_pullup() may modify m, so pullup in
* this scope.
*/
igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN +
sizeof(struct in_addr) * nsrc;
if ((!M_WRITABLE(m) ||
m->m_len < igmpv3len) &&
(m = m_pullup(m, igmpv3len)) == NULL) {
IGMPSTAT_INC(igps_rcv_tooshort);
return (IPPROTO_DONE);
}
igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *)
+ iphlen);
if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) {
m_freem(m);
return (IPPROTO_DONE);
}
}
break;
}
break;
case IGMP_v1_HOST_MEMBERSHIP_REPORT:
if (!V_igmp_v1enable)
break;
if (igmp_input_v1_report(ifp, ip, igmp) != 0) {
m_freem(m);
return (IPPROTO_DONE);
}
break;
case IGMP_v2_HOST_MEMBERSHIP_REPORT:
if (!V_igmp_v2enable)
break;
if (!ip_checkrouteralert(m))
IGMPSTAT_INC(igps_rcv_nora);
if (igmp_input_v2_report(ifp, ip, igmp) != 0) {
m_freem(m);
return (IPPROTO_DONE);
}
break;
case IGMP_v3_HOST_MEMBERSHIP_REPORT:
/*
* Hosts do not need to process IGMPv3 membership reports,
* as report suppression is no longer required.
*/
if (!ip_checkrouteralert(m))
IGMPSTAT_INC(igps_rcv_nora);
break;
default:
break;
}
/*
* Pass all valid IGMP packets up to any process(es) listening on a
* raw IGMP socket.
*/
*mp = m;
return (rip_input(mp, offp, proto));
}
/*
* Fast timeout handler (global).
* VIMAGE: Timeout handlers are expected to service all vimages.
*/
void
igmp_fasttimo(void)
{
VNET_ITERATOR_DECL(vnet_iter);
VNET_LIST_RLOCK_NOSLEEP();
VNET_FOREACH(vnet_iter) {
CURVNET_SET(vnet_iter);
igmp_fasttimo_vnet();
CURVNET_RESTORE();
}
VNET_LIST_RUNLOCK_NOSLEEP();
}
/*
* Fast timeout handler (per-vnet).
* Sends are shuffled off to a netisr to deal with Giant.
*
* VIMAGE: Assume caller has set up our curvnet.
*/
static void
igmp_fasttimo_vnet(void)
{
struct mbufq scq; /* State-change packets */
struct mbufq qrq; /* Query response packets */
struct ifnet *ifp;
struct igmp_ifsoftc *igi;
struct ifmultiaddr *ifma;
struct in_multi *inm;
int loop, uri_fasthz;
loop = 0;
uri_fasthz = 0;
/*
* Quick check to see if any work needs to be done, in order to
* minimize the overhead of fasttimo processing.
* SMPng: XXX Unlocked reads.
*/
if (!V_current_state_timers_running &&
!V_interface_timers_running &&
!V_state_change_timers_running)
return;
IN_MULTI_LOCK();
IGMP_LOCK();
/*
* IGMPv3 General Query response timer processing.
*/
if (V_interface_timers_running) {
CTR1(KTR_IGMPV3, "%s: interface timers running", __func__);
V_interface_timers_running = 0;
LIST_FOREACH(igi, &V_igi_head, igi_link) {
if (igi->igi_v3_timer == 0) {
/* Do nothing. */
} else if (--igi->igi_v3_timer == 0) {
igmp_v3_dispatch_general_query(igi);
} else {
V_interface_timers_running = 1;
}
}
}
if (!V_current_state_timers_running &&
!V_state_change_timers_running)
goto out_locked;
V_current_state_timers_running = 0;
V_state_change_timers_running = 0;
CTR1(KTR_IGMPV3, "%s: state change timers running", __func__);
/*
* IGMPv1/v2/v3 host report and state-change timer processing.
* Note: Processing a v3 group timer may remove a node.
*/
LIST_FOREACH(igi, &V_igi_head, igi_link) {
ifp = igi->igi_ifp;
if (igi->igi_version == IGMP_VERSION_3) {
loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0;
uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri *
PR_FASTHZ);
mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS);
mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS);
}
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
switch (igi->igi_version) {
case IGMP_VERSION_1:
case IGMP_VERSION_2:
igmp_v1v2_process_group_timer(inm,
igi->igi_version);
break;
case IGMP_VERSION_3:
igmp_v3_process_group_timers(igi, &qrq,
&scq, inm, uri_fasthz);
break;
}
}
IF_ADDR_RUNLOCK(ifp);
if (igi->igi_version == IGMP_VERSION_3) {
struct in_multi *tinm;
igmp_dispatch_queue(&qrq, 0, loop);
igmp_dispatch_queue(&scq, 0, loop);
/*
* Free the in_multi reference(s) for this
* IGMP lifecycle.
*/
SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead,
inm_nrele, tinm) {
SLIST_REMOVE_HEAD(&igi->igi_relinmhead,
inm_nrele);
inm_release_locked(inm);
}
}
}
out_locked:
IGMP_UNLOCK();
IN_MULTI_UNLOCK();
}
/*
* Update host report group timer for IGMPv1/v2.
* Will update the global pending timer flags.
*/
static void
igmp_v1v2_process_group_timer(struct in_multi *inm, const int version)
{
int report_timer_expired;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
if (inm->inm_timer == 0) {
report_timer_expired = 0;
} else if (--inm->inm_timer == 0) {
report_timer_expired = 1;
} else {
V_current_state_timers_running = 1;
return;
}
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
break;
case IGMP_REPORTING_MEMBER:
if (report_timer_expired) {
inm->inm_state = IGMP_IDLE_MEMBER;
(void)igmp_v1v2_queue_report(inm,
(version == IGMP_VERSION_2) ?
IGMP_v2_HOST_MEMBERSHIP_REPORT :
IGMP_v1_HOST_MEMBERSHIP_REPORT);
}
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_LEAVING_MEMBER:
break;
}
}
/*
* Update a group's timers for IGMPv3.
* Will update the global pending timer flags.
* Note: Unlocked read from igi.
*/
static void
igmp_v3_process_group_timers(struct igmp_ifsoftc *igi,
struct mbufq *qrq, struct mbufq *scq,
struct in_multi *inm, const int uri_fasthz)
{
int query_response_timer_expired;
int state_change_retransmit_timer_expired;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
query_response_timer_expired = 0;
state_change_retransmit_timer_expired = 0;
/*
* During a transition from v1/v2 compatibility mode back to v3,
* a group record in REPORTING state may still have its group
* timer active. This is a no-op in this function; it is easier
* to deal with it here than to complicate the slow-timeout path.
*/
if (inm->inm_timer == 0) {
query_response_timer_expired = 0;
} else if (--inm->inm_timer == 0) {
query_response_timer_expired = 1;
} else {
V_current_state_timers_running = 1;
}
if (inm->inm_sctimer == 0) {
state_change_retransmit_timer_expired = 0;
} else if (--inm->inm_sctimer == 0) {
state_change_retransmit_timer_expired = 1;
} else {
V_state_change_timers_running = 1;
}
/* We are in fasttimo, so be quick about it. */
if (!state_change_retransmit_timer_expired &&
!query_response_timer_expired)
return;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_AWAKENING_MEMBER:
case IGMP_IDLE_MEMBER:
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
/*
* Respond to a previously pending Group-Specific
* or Group-and-Source-Specific query by enqueueing
* the appropriate Current-State report for
* immediate transmission.
*/
if (query_response_timer_expired) {
int retval;
retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1,
(inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER));
CTR2(KTR_IGMPV3, "%s: enqueue record = %d",
__func__, retval);
inm->inm_state = IGMP_REPORTING_MEMBER;
/* XXX Clear recorded sources for next time. */
inm_clear_recorded(inm);
}
/* FALLTHROUGH */
case IGMP_REPORTING_MEMBER:
case IGMP_LEAVING_MEMBER:
if (state_change_retransmit_timer_expired) {
/*
* State-change retransmission timer fired.
* If there are any further pending retransmissions,
* set the global pending state-change flag, and
* reset the timer.
*/
if (--inm->inm_scrv > 0) {
inm->inm_sctimer = uri_fasthz;
V_state_change_timers_running = 1;
}
/*
* Retransmit the previously computed state-change
* report. If there are no further pending
* retransmissions, the mbuf queue will be consumed.
* Update T0 state to T1 as we have now sent
* a state-change.
*/
(void)igmp_v3_merge_state_changes(inm, scq);
inm_commit(inm);
CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
/*
* If we are leaving the group for good, make sure
* we release IGMP's reference to it.
* This release must be deferred using a SLIST,
* as we are called from a loop which traverses
* the in_ifmultiaddr TAILQ.
*/
if (inm->inm_state == IGMP_LEAVING_MEMBER &&
inm->inm_scrv == 0) {
inm->inm_state = IGMP_NOT_MEMBER;
SLIST_INSERT_HEAD(&igi->igi_relinmhead,
inm, inm_nrele);
}
}
break;
}
}
/*
* Suppress a group's pending response to a group or source/group query.
*
* Do NOT suppress state changes. This leads to IGMPv3 inconsistency.
* Do NOT update ST1/ST0 as this operation merely suppresses
* the currently pending group record.
* Do NOT suppress the response to a general query. It is possible but
* it would require adding another state or flag.
*/
static void
igmp_v3_suppress_group_record(struct in_multi *inm)
{
IN_MULTI_LOCK_ASSERT();
KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3,
("%s: not IGMPv3 mode on link", __func__));
if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER ||
inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER)
return;
if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)
inm_clear_recorded(inm);
inm->inm_timer = 0;
inm->inm_state = IGMP_REPORTING_MEMBER;
}
/*
* Switch to a different IGMP version on the given interface,
* as per Section 7.2.1.
*/
static void
igmp_set_version(struct igmp_ifsoftc *igi, const int version)
{
int old_version_timer;
IGMP_LOCK_ASSERT();
CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__,
version, igi->igi_ifp, igi->igi_ifp->if_xname);
if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) {
/*
* Compute the "Older Version Querier Present" timer as per
* Section 8.12.
*/
old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri;
old_version_timer *= PR_SLOWHZ;
if (version == IGMP_VERSION_1) {
igi->igi_v1_timer = old_version_timer;
igi->igi_v2_timer = 0;
} else if (version == IGMP_VERSION_2) {
igi->igi_v1_timer = 0;
igi->igi_v2_timer = old_version_timer;
}
}
if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) {
if (igi->igi_version != IGMP_VERSION_2) {
igi->igi_version = IGMP_VERSION_2;
igmp_v3_cancel_link_timers(igi);
}
} else if (igi->igi_v1_timer > 0) {
if (igi->igi_version != IGMP_VERSION_1) {
igi->igi_version = IGMP_VERSION_1;
igmp_v3_cancel_link_timers(igi);
}
}
}
/*
* Cancel pending IGMPv3 timers for the given link and all groups
* joined on it; state-change, general-query, and group-query timers.
*
* Only ever called on a transition from v3 to Compatibility mode. Kill
* the timers stone dead (this may be expensive for large N groups), they
* will be restarted if Compatibility Mode deems that they must be due to
* query processing.
*/
static void
igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi)
{
struct ifmultiaddr *ifma;
struct ifnet *ifp;
struct in_multi *inm, *tinm;
CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__,
igi->igi_ifp, igi->igi_ifp->if_xname);
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
/*
* Stop the v3 General Query Response on this link stone dead.
* If fasttimo is woken up due to V_interface_timers_running,
* the flag will be cleared if there are no pending link timers.
*/
igi->igi_v3_timer = 0;
/*
* Now clear the current-state and state-change report timers
* for all memberships scoped to this link.
*/
ifp = igi->igi_ifp;
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
/*
* These states are either not relevant in v3 mode,
* or are unreported. Do nothing.
*/
break;
case IGMP_LEAVING_MEMBER:
/*
* If we are leaving the group and switching to
* compatibility mode, we need to release the final
* reference held for issuing the INCLUDE {}, and
* transition to REPORTING to ensure the host leave
* message is sent upstream to the old querier --
* transition to NOT would lose the leave and race.
*/
SLIST_INSERT_HEAD(&igi->igi_relinmhead, inm, inm_nrele);
/* FALLTHROUGH */
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
inm_clear_recorded(inm);
/* FALLTHROUGH */
case IGMP_REPORTING_MEMBER:
inm->inm_state = IGMP_REPORTING_MEMBER;
break;
}
/*
* Always clear state-change and group report timers.
* Free any pending IGMPv3 state-change records.
*/
inm->inm_sctimer = 0;
inm->inm_timer = 0;
mbufq_drain(&inm->inm_scq);
}
IF_ADDR_RUNLOCK(ifp);
SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, inm_nrele, tinm) {
SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele);
inm_release_locked(inm);
}
}
/*
* Update the Older Version Querier Present timers for a link.
* See Section 7.2.1 of RFC 3376.
*/
static void
igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi)
{
IGMP_LOCK_ASSERT();
if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) {
/*
* IGMPv1 and IGMPv2 Querier Present timers expired.
*
* Revert to IGMPv3.
*/
if (igi->igi_version != IGMP_VERSION_3) {
CTR5(KTR_IGMPV3,
"%s: transition from v%d -> v%d on %p(%s)",
__func__, igi->igi_version, IGMP_VERSION_3,
igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_version = IGMP_VERSION_3;
}
} else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) {
/*
* IGMPv1 Querier Present timer expired,
* IGMPv2 Querier Present timer running.
* If IGMPv2 was disabled since last timeout,
* revert to IGMPv3.
* If IGMPv2 is enabled, revert to IGMPv2.
*/
if (!V_igmp_v2enable) {
CTR5(KTR_IGMPV3,
"%s: transition from v%d -> v%d on %p(%s)",
__func__, igi->igi_version, IGMP_VERSION_3,
igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_v2_timer = 0;
igi->igi_version = IGMP_VERSION_3;
} else {
--igi->igi_v2_timer;
if (igi->igi_version != IGMP_VERSION_2) {
CTR5(KTR_IGMPV3,
"%s: transition from v%d -> v%d on %p(%s)",
__func__, igi->igi_version, IGMP_VERSION_2,
igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_version = IGMP_VERSION_2;
igmp_v3_cancel_link_timers(igi);
}
}
} else if (igi->igi_v1_timer > 0) {
/*
* IGMPv1 Querier Present timer running.
* Stop IGMPv2 timer if running.
*
* If IGMPv1 was disabled since last timeout,
* revert to IGMPv3.
* If IGMPv1 is enabled, reset IGMPv2 timer if running.
*/
if (!V_igmp_v1enable) {
CTR5(KTR_IGMPV3,
"%s: transition from v%d -> v%d on %p(%s)",
__func__, igi->igi_version, IGMP_VERSION_3,
igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_v1_timer = 0;
igi->igi_version = IGMP_VERSION_3;
} else {
--igi->igi_v1_timer;
}
if (igi->igi_v2_timer > 0) {
CTR3(KTR_IGMPV3,
"%s: cancel v2 timer on %p(%s)",
__func__, igi->igi_ifp, igi->igi_ifp->if_xname);
igi->igi_v2_timer = 0;
}
}
}
/*
* Global slowtimo handler.
* VIMAGE: Timeout handlers are expected to service all vimages.
*/
void
igmp_slowtimo(void)
{
VNET_ITERATOR_DECL(vnet_iter);
VNET_LIST_RLOCK_NOSLEEP();
VNET_FOREACH(vnet_iter) {
CURVNET_SET(vnet_iter);
igmp_slowtimo_vnet();
CURVNET_RESTORE();
}
VNET_LIST_RUNLOCK_NOSLEEP();
}
/*
* Per-vnet slowtimo handler.
*/
static void
igmp_slowtimo_vnet(void)
{
struct igmp_ifsoftc *igi;
IGMP_LOCK();
LIST_FOREACH(igi, &V_igi_head, igi_link) {
igmp_v1v2_process_querier_timers(igi);
}
IGMP_UNLOCK();
}
/*
* Dispatch an IGMPv1/v2 host report or leave message.
* These are always small enough to fit inside a single mbuf.
*/
static int
igmp_v1v2_queue_report(struct in_multi *inm, const int type)
{
struct ifnet *ifp;
struct igmp *igmp;
struct ip *ip;
struct mbuf *m;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
ifp = inm->inm_ifp;
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL)
return (ENOMEM);
M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp));
m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp);
m->m_data += sizeof(struct ip);
m->m_len = sizeof(struct igmp);
igmp = mtod(m, struct igmp *);
igmp->igmp_type = type;
igmp->igmp_code = 0;
igmp->igmp_group = inm->inm_addr;
igmp->igmp_cksum = 0;
igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp));
m->m_data -= sizeof(struct ip);
m->m_len += sizeof(struct ip);
ip = mtod(m, struct ip *);
ip->ip_tos = 0;
ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp));
ip->ip_off = 0;
ip->ip_p = IPPROTO_IGMP;
ip->ip_src.s_addr = INADDR_ANY;
if (type == IGMP_HOST_LEAVE_MESSAGE)
ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP);
else
ip->ip_dst = inm->inm_addr;
igmp_save_context(m, ifp);
m->m_flags |= M_IGMPV2;
if (inm->inm_igi->igi_flags & IGIF_LOOPBACK)
m->m_flags |= M_IGMP_LOOP;
CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m);
netisr_dispatch(NETISR_IGMP, m);
return (0);
}
/*
* Process a state change from the upper layer for the given IPv4 group.
*
* Each socket holds a reference on the in_multi in its own ip_moptions.
* The socket layer will have made the necessary updates to.the group
* state, it is now up to IGMP to issue a state change report if there
* has been any change between T0 (when the last state-change was issued)
* and T1 (now).
*
* We use the IGMPv3 state machine at group level. The IGMP module
* however makes the decision as to which IGMP protocol version to speak.
* A state change *from* INCLUDE {} always means an initial join.
* A state change *to* INCLUDE {} always means a final leave.
*
* FUTURE: If IGIF_V3LITE is enabled for this interface, then we can
* save ourselves a bunch of work; any exclusive mode groups need not
* compute source filter lists.
*
* VIMAGE: curvnet should have been set by caller, as this routine
* is called from the socket option handlers.
*/
int
igmp_change_state(struct in_multi *inm)
{
struct igmp_ifsoftc *igi;
struct ifnet *ifp;
int error;
IN_MULTI_LOCK_ASSERT();
error = 0;
/*
* Try to detect if the upper layer just asked us to change state
* for an interface which has now gone away.
*/
KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__));
ifp = inm->inm_ifma->ifma_ifp;
/*
* Sanity check that netinet's notion of ifp is the
* same as net's.
*/
KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__));
IGMP_LOCK();
igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp));
/*
* If we detect a state transition to or from MCAST_UNDEFINED
* for this group, then we are starting or finishing an IGMP
* life cycle for this group.
*/
if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) {
CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__,
inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode);
if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) {
CTR1(KTR_IGMPV3, "%s: initial join", __func__);
error = igmp_initial_join(inm, igi);
goto out_locked;
} else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) {
CTR1(KTR_IGMPV3, "%s: final leave", __func__);
igmp_final_leave(inm, igi);
goto out_locked;
}
} else {
CTR1(KTR_IGMPV3, "%s: filter set change", __func__);
}
error = igmp_handle_state_change(inm, igi);
out_locked:
IGMP_UNLOCK();
return (error);
}
/*
* Perform the initial join for an IGMP group.
*
* When joining a group:
* If the group should have its IGMP traffic suppressed, do nothing.
* IGMPv1 starts sending IGMPv1 host membership reports.
* IGMPv2 starts sending IGMPv2 host membership reports.
* IGMPv3 will schedule an IGMPv3 state-change report containing the
* initial state of the membership.
*/
static int
igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi)
{
struct ifnet *ifp;
struct mbufq *mq;
int error, retval, syncstates;
CTR4(KTR_IGMPV3, "%s: initial join %s on ifp %p(%s)",
__func__, inet_ntoa(inm->inm_addr), inm->inm_ifp,
inm->inm_ifp->if_xname);
error = 0;
syncstates = 1;
ifp = inm->inm_ifp;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__));
/*
* Groups joined on loopback or marked as 'not reported',
* e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and
* are never reported in any IGMP protocol exchanges.
* All other groups enter the appropriate IGMP state machine
* for the version in use on this link.
* A link marked as IGIF_SILENT causes IGMP to be completely
* disabled for the link.
*/
if ((ifp->if_flags & IFF_LOOPBACK) ||
(igi->igi_flags & IGIF_SILENT) ||
!igmp_isgroupreported(inm->inm_addr)) {
CTR1(KTR_IGMPV3,
"%s: not kicking state machine for silent group", __func__);
inm->inm_state = IGMP_SILENT_MEMBER;
inm->inm_timer = 0;
} else {
/*
* Deal with overlapping in_multi lifecycle.
* If this group was LEAVING, then make sure
* we drop the reference we picked up to keep the
* group around for the final INCLUDE {} enqueue.
*/
if (igi->igi_version == IGMP_VERSION_3 &&
inm->inm_state == IGMP_LEAVING_MEMBER)
inm_release_locked(inm);
inm->inm_state = IGMP_REPORTING_MEMBER;
switch (igi->igi_version) {
case IGMP_VERSION_1:
case IGMP_VERSION_2:
inm->inm_state = IGMP_IDLE_MEMBER;
error = igmp_v1v2_queue_report(inm,
(igi->igi_version == IGMP_VERSION_2) ?
IGMP_v2_HOST_MEMBERSHIP_REPORT :
IGMP_v1_HOST_MEMBERSHIP_REPORT);
if (error == 0) {
inm->inm_timer = IGMP_RANDOM_DELAY(
IGMP_V1V2_MAX_RI * PR_FASTHZ);
V_current_state_timers_running = 1;
}
break;
case IGMP_VERSION_3:
/*
* Defer update of T0 to T1, until the first copy
* of the state change has been transmitted.
*/
syncstates = 0;
/*
* Immediately enqueue a State-Change Report for
* this interface, freeing any previous reports.
* Don't kick the timers if there is nothing to do,
* or if an error occurred.
*/
mq = &inm->inm_scq;
mbufq_drain(mq);
retval = igmp_v3_enqueue_group_record(mq, inm, 1,
0, 0);
CTR2(KTR_IGMPV3, "%s: enqueue record = %d",
__func__, retval);
if (retval <= 0) {
error = retval * -1;
break;
}
/*
* Schedule transmission of pending state-change
* report up to RV times for this link. The timer
* will fire at the next igmp_fasttimo (~200ms),
* giving us an opportunity to merge the reports.
*/
if (igi->igi_flags & IGIF_LOOPBACK) {
inm->inm_scrv = 1;
} else {
KASSERT(igi->igi_rv > 1,
("%s: invalid robustness %d", __func__,
igi->igi_rv));
inm->inm_scrv = igi->igi_rv;
}
inm->inm_sctimer = 1;
V_state_change_timers_running = 1;
error = 0;
break;
}
}
/*
* Only update the T0 state if state change is atomic,
* i.e. we don't need to wait for a timer to fire before we
* can consider the state change to have been communicated.
*/
if (syncstates) {
inm_commit(inm);
CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
}
return (error);
}
/*
* Issue an intermediate state change during the IGMP life-cycle.
*/
static int
igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi)
{
struct ifnet *ifp;
int retval;
CTR4(KTR_IGMPV3, "%s: state change for %s on ifp %p(%s)",
__func__, inet_ntoa(inm->inm_addr), inm->inm_ifp,
inm->inm_ifp->if_xname);
ifp = inm->inm_ifp;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__));
if ((ifp->if_flags & IFF_LOOPBACK) ||
(igi->igi_flags & IGIF_SILENT) ||
!igmp_isgroupreported(inm->inm_addr) ||
(igi->igi_version != IGMP_VERSION_3)) {
if (!igmp_isgroupreported(inm->inm_addr)) {
CTR1(KTR_IGMPV3,
"%s: not kicking state machine for silent group", __func__);
}
CTR1(KTR_IGMPV3, "%s: nothing to do", __func__);
inm_commit(inm);
CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
return (0);
}
mbufq_drain(&inm->inm_scq);
retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0);
CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval);
if (retval <= 0)
return (-retval);
/*
* If record(s) were enqueued, start the state-change
* report timer for this group.
*/
inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv);
inm->inm_sctimer = 1;
V_state_change_timers_running = 1;
return (0);
}
/*
* Perform the final leave for an IGMP group.
*
* When leaving a group:
* IGMPv1 does nothing.
* IGMPv2 sends a host leave message, if and only if we are the reporter.
* IGMPv3 enqueues a state-change report containing a transition
* to INCLUDE {} for immediate transmission.
*/
static void
igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi)
{
int syncstates;
syncstates = 1;
CTR4(KTR_IGMPV3, "%s: final leave %s on ifp %p(%s)",
__func__, inet_ntoa(inm->inm_addr), inm->inm_ifp,
inm->inm_ifp->if_xname);
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
case IGMP_LEAVING_MEMBER:
/* Already leaving or left; do nothing. */
CTR1(KTR_IGMPV3,
"%s: not kicking state machine for silent group", __func__);
break;
case IGMP_REPORTING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
if (igi->igi_version == IGMP_VERSION_2) {
#ifdef INVARIANTS
if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER ||
inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)
panic("%s: IGMPv3 state reached, not IGMPv3 mode",
__func__);
#endif
igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE);
inm->inm_state = IGMP_NOT_MEMBER;
} else if (igi->igi_version == IGMP_VERSION_3) {
/*
* Stop group timer and all pending reports.
* Immediately enqueue a state-change report
* TO_IN {} to be sent on the next fast timeout,
* giving us an opportunity to merge reports.
*/
mbufq_drain(&inm->inm_scq);
inm->inm_timer = 0;
if (igi->igi_flags & IGIF_LOOPBACK) {
inm->inm_scrv = 1;
} else {
inm->inm_scrv = igi->igi_rv;
}
CTR4(KTR_IGMPV3, "%s: Leaving %s/%s with %d "
"pending retransmissions.", __func__,
inet_ntoa(inm->inm_addr),
inm->inm_ifp->if_xname, inm->inm_scrv);
if (inm->inm_scrv == 0) {
inm->inm_state = IGMP_NOT_MEMBER;
inm->inm_sctimer = 0;
} else {
int retval;
inm_acquire_locked(inm);
retval = igmp_v3_enqueue_group_record(
&inm->inm_scq, inm, 1, 0, 0);
KASSERT(retval != 0,
("%s: enqueue record = %d", __func__,
retval));
inm->inm_state = IGMP_LEAVING_MEMBER;
inm->inm_sctimer = 1;
V_state_change_timers_running = 1;
syncstates = 0;
}
break;
}
break;
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
/* Our reports are suppressed; do nothing. */
break;
}
if (syncstates) {
inm_commit(inm);
CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
inm->inm_st[1].iss_fmode = MCAST_UNDEFINED;
CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for %s/%s",
__func__, inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
}
}
/*
* Enqueue an IGMPv3 group record to the given output queue.
*
* XXX This function could do with having the allocation code
* split out, and the multiple-tree-walks coalesced into a single
* routine as has been done in igmp_v3_enqueue_filter_change().
*
* If is_state_change is zero, a current-state record is appended.
* If is_state_change is non-zero, a state-change report is appended.
*
* If is_group_query is non-zero, an mbuf packet chain is allocated.
* If is_group_query is zero, and if there is a packet with free space
* at the tail of the queue, it will be appended to providing there
* is enough free space.
* Otherwise a new mbuf packet chain is allocated.
*
* If is_source_query is non-zero, each source is checked to see if
* it was recorded for a Group-Source query, and will be omitted if
* it is not both in-mode and recorded.
*
* The function will attempt to allocate leading space in the packet
* for the IP/IGMP header to be prepended without fragmenting the chain.
*
* If successful the size of all data appended to the queue is returned,
* otherwise an error code less than zero is returned, or zero if
* no record(s) were appended.
*/
static int
igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm,
const int is_state_change, const int is_group_query,
const int is_source_query)
{
struct igmp_grouprec ig;
struct igmp_grouprec *pig;
struct ifnet *ifp;
struct ip_msource *ims, *nims;
struct mbuf *m0, *m, *md;
int error, is_filter_list_change;
int minrec0len, m0srcs, msrcs, nbytes, off;
int record_has_sources;
int now;
int type;
in_addr_t naddr;
uint8_t mode;
IN_MULTI_LOCK_ASSERT();
error = 0;
ifp = inm->inm_ifp;
is_filter_list_change = 0;
m = NULL;
m0 = NULL;
m0srcs = 0;
msrcs = 0;
nbytes = 0;
nims = NULL;
record_has_sources = 1;
pig = NULL;
type = IGMP_DO_NOTHING;
mode = inm->inm_st[1].iss_fmode;
/*
* If we did not transition out of ASM mode during t0->t1,
* and there are no source nodes to process, we can skip
* the generation of source records.
*/
if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 &&
inm->inm_nsrc == 0)
record_has_sources = 0;
if (is_state_change) {
/*
* Queue a state change record.
* If the mode did not change, and there are non-ASM
* listeners or source filters present,
* we potentially need to issue two records for the group.
* If we are transitioning to MCAST_UNDEFINED, we need
* not send any sources.
* If there are ASM listeners, and there was no filter
* mode transition of any kind, do nothing.
*/
if (mode != inm->inm_st[0].iss_fmode) {
if (mode == MCAST_EXCLUDE) {
CTR1(KTR_IGMPV3, "%s: change to EXCLUDE",
__func__);
type = IGMP_CHANGE_TO_EXCLUDE_MODE;
} else {
CTR1(KTR_IGMPV3, "%s: change to INCLUDE",
__func__);
type = IGMP_CHANGE_TO_INCLUDE_MODE;
if (mode == MCAST_UNDEFINED)
record_has_sources = 0;
}
} else {
if (record_has_sources) {
is_filter_list_change = 1;
} else {
type = IGMP_DO_NOTHING;
}
}
} else {
/*
* Queue a current state record.
*/
if (mode == MCAST_EXCLUDE) {
type = IGMP_MODE_IS_EXCLUDE;
} else if (mode == MCAST_INCLUDE) {
type = IGMP_MODE_IS_INCLUDE;
KASSERT(inm->inm_st[1].iss_asm == 0,
("%s: inm %p is INCLUDE but ASM count is %d",
__func__, inm, inm->inm_st[1].iss_asm));
}
}
/*
* Generate the filter list changes using a separate function.
*/
if (is_filter_list_change)
return (igmp_v3_enqueue_filter_change(mq, inm));
if (type == IGMP_DO_NOTHING) {
CTR3(KTR_IGMPV3, "%s: nothing to do for %s/%s",
__func__, inet_ntoa(inm->inm_addr),
inm->inm_ifp->if_xname);
return (0);
}
/*
* If any sources are present, we must be able to fit at least
* one in the trailing space of the tail packet's mbuf,
* ideally more.
*/
minrec0len = sizeof(struct igmp_grouprec);
if (record_has_sources)
minrec0len += sizeof(in_addr_t);
CTR4(KTR_IGMPV3, "%s: queueing %s for %s/%s", __func__,
igmp_rec_type_to_str(type), inet_ntoa(inm->inm_addr),
inm->inm_ifp->if_xname);
/*
* Check if we have a packet in the tail of the queue for this
* group into which the first group record for this group will fit.
* Otherwise allocate a new packet.
* Always allocate leading space for IP+RA_OPT+IGMP+REPORT.
* Note: Group records for G/GSR query responses MUST be sent
* in their own packet.
*/
m0 = mbufq_last(mq);
if (!is_group_query &&
m0 != NULL &&
(m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) &&
(m0->m_pkthdr.len + minrec0len) <
(ifp->if_mtu - IGMP_LEADINGSPACE)) {
m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
m = m0;
CTR1(KTR_IGMPV3, "%s: use existing packet", __func__);
} else {
if (mbufq_full(mq)) {
CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__);
return (-ENOMEM);
}
m = NULL;
m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
if (!is_state_change && !is_group_query) {
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
if (m)
m->m_data += IGMP_LEADINGSPACE;
}
if (m == NULL) {
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m)
M_ALIGN(m, IGMP_LEADINGSPACE);
}
if (m == NULL)
return (-ENOMEM);
igmp_save_context(m, ifp);
CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__);
}
/*
* Append group record.
* If we have sources, we don't know how many yet.
*/
ig.ig_type = type;
ig.ig_datalen = 0;
ig.ig_numsrc = 0;
ig.ig_group = inm->inm_addr;
if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__);
return (-ENOMEM);
}
nbytes += sizeof(struct igmp_grouprec);
/*
* Append as many sources as will fit in the first packet.
* If we are appending to a new packet, the chain allocation
* may potentially use clusters; use m_getptr() in this case.
* If we are appending to an existing packet, we need to obtain
* a pointer to the group record after m_append(), in case a new
* mbuf was allocated.
* Only append sources which are in-mode at t1. If we are
* transitioning to MCAST_UNDEFINED state on the group, do not
* include source entries.
* Only report recorded sources in our filter set when responding
* to a group-source query.
*/
if (record_has_sources) {
if (m == m0) {
md = m_last(m);
pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) +
md->m_len - nbytes);
} else {
md = m_getptr(m, 0, &off);
pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) +
off);
}
msrcs = 0;
RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) {
CTR2(KTR_IGMPV3, "%s: visit node %s", __func__,
inet_ntoa_haddr(ims->ims_haddr));
now = ims_get_mode(inm, ims, 1);
CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now);
if ((now != mode) ||
(now == mode && mode == MCAST_UNDEFINED)) {
CTR1(KTR_IGMPV3, "%s: skip node", __func__);
continue;
}
if (is_source_query && ims->ims_stp == 0) {
CTR1(KTR_IGMPV3, "%s: skip unrecorded node",
__func__);
continue;
}
CTR1(KTR_IGMPV3, "%s: append node", __func__);
naddr = htonl(ims->ims_haddr);
if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3, "%s: m_append() failed.",
__func__);
return (-ENOMEM);
}
nbytes += sizeof(in_addr_t);
++msrcs;
if (msrcs == m0srcs)
break;
}
CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__,
msrcs);
pig->ig_numsrc = htons(msrcs);
nbytes += (msrcs * sizeof(in_addr_t));
}
if (is_source_query && msrcs == 0) {
CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__);
if (m != m0)
m_freem(m);
return (0);
}
/*
* We are good to go with first packet.
*/
if (m != m0) {
CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__);
m->m_pkthdr.PH_vt.vt_nrecs = 1;
mbufq_enqueue(mq, m);
} else
m->m_pkthdr.PH_vt.vt_nrecs++;
/*
* No further work needed if no source list in packet(s).
*/
if (!record_has_sources)
return (nbytes);
/*
* Whilst sources remain to be announced, we need to allocate
* a new packet and fill out as many sources as will fit.
* Always try for a cluster first.
*/
while (nims != NULL) {
if (mbufq_full(mq)) {
CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__);
return (-ENOMEM);
}
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
if (m)
m->m_data += IGMP_LEADINGSPACE;
if (m == NULL) {
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m)
M_ALIGN(m, IGMP_LEADINGSPACE);
}
if (m == NULL)
return (-ENOMEM);
igmp_save_context(m, ifp);
md = m_getptr(m, 0, &off);
pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off);
CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__);
if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__);
return (-ENOMEM);
}
m->m_pkthdr.PH_vt.vt_nrecs = 1;
nbytes += sizeof(struct igmp_grouprec);
m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
msrcs = 0;
RB_FOREACH_FROM(ims, ip_msource_tree, nims) {
CTR2(KTR_IGMPV3, "%s: visit node %s", __func__,
inet_ntoa_haddr(ims->ims_haddr));
now = ims_get_mode(inm, ims, 1);
if ((now != mode) ||
(now == mode && mode == MCAST_UNDEFINED)) {
CTR1(KTR_IGMPV3, "%s: skip node", __func__);
continue;
}
if (is_source_query && ims->ims_stp == 0) {
CTR1(KTR_IGMPV3, "%s: skip unrecorded node",
__func__);
continue;
}
CTR1(KTR_IGMPV3, "%s: append node", __func__);
naddr = htonl(ims->ims_haddr);
if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3, "%s: m_append() failed.",
__func__);
return (-ENOMEM);
}
++msrcs;
if (msrcs == m0srcs)
break;
}
pig->ig_numsrc = htons(msrcs);
nbytes += (msrcs * sizeof(in_addr_t));
CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__);
mbufq_enqueue(mq, m);
}
return (nbytes);
}
/*
* Type used to mark record pass completion.
* We exploit the fact we can cast to this easily from the
* current filter modes on each ip_msource node.
*/
typedef enum {
REC_NONE = 0x00, /* MCAST_UNDEFINED */
REC_ALLOW = 0x01, /* MCAST_INCLUDE */
REC_BLOCK = 0x02, /* MCAST_EXCLUDE */
REC_FULL = REC_ALLOW | REC_BLOCK
} rectype_t;
/*
* Enqueue an IGMPv3 filter list change to the given output queue.
*
* Source list filter state is held in an RB-tree. When the filter list
* for a group is changed without changing its mode, we need to compute
* the deltas between T0 and T1 for each source in the filter set,
* and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records.
*
* As we may potentially queue two record types, and the entire R-B tree
* needs to be walked at once, we break this out into its own function
* so we can generate a tightly packed queue of packets.
*
* XXX This could be written to only use one tree walk, although that makes
* serializing into the mbuf chains a bit harder. For now we do two walks
* which makes things easier on us, and it may or may not be harder on
* the L2 cache.
*
* If successful the size of all data appended to the queue is returned,
* otherwise an error code less than zero is returned, or zero if
* no record(s) were appended.
*/
static int
igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm)
{
static const int MINRECLEN =
sizeof(struct igmp_grouprec) + sizeof(in_addr_t);
struct ifnet *ifp;
struct igmp_grouprec ig;
struct igmp_grouprec *pig;
struct ip_msource *ims, *nims;
struct mbuf *m, *m0, *md;
in_addr_t naddr;
int m0srcs, nbytes, npbytes, off, rsrcs, schanged;
int nallow, nblock;
uint8_t mode, now, then;
rectype_t crt, drt, nrt;
IN_MULTI_LOCK_ASSERT();
if (inm->inm_nsrc == 0 ||
(inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0))
return (0);
ifp = inm->inm_ifp; /* interface */
mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */
crt = REC_NONE; /* current group record type */
drt = REC_NONE; /* mask of completed group record types */
nrt = REC_NONE; /* record type for current node */
m0srcs = 0; /* # source which will fit in current mbuf chain */
nbytes = 0; /* # of bytes appended to group's state-change queue */
npbytes = 0; /* # of bytes appended this packet */
rsrcs = 0; /* # sources encoded in current record */
schanged = 0; /* # nodes encoded in overall filter change */
nallow = 0; /* # of source entries in ALLOW_NEW */
nblock = 0; /* # of source entries in BLOCK_OLD */
nims = NULL; /* next tree node pointer */
/*
* For each possible filter record mode.
* The first kind of source we encounter tells us which
* is the first kind of record we start appending.
* If a node transitioned to UNDEFINED at t1, its mode is treated
* as the inverse of the group's filter mode.
*/
while (drt != REC_FULL) {
do {
m0 = mbufq_last(mq);
if (m0 != NULL &&
(m0->m_pkthdr.PH_vt.vt_nrecs + 1 <=
IGMP_V3_REPORT_MAXRECS) &&
(m0->m_pkthdr.len + MINRECLEN) <
(ifp->if_mtu - IGMP_LEADINGSPACE)) {
m = m0;
m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
sizeof(struct igmp_grouprec)) /
sizeof(in_addr_t);
CTR1(KTR_IGMPV3,
"%s: use previous packet", __func__);
} else {
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
if (m)
m->m_data += IGMP_LEADINGSPACE;
if (m == NULL) {
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m)
M_ALIGN(m, IGMP_LEADINGSPACE);
}
if (m == NULL) {
CTR1(KTR_IGMPV3,
"%s: m_get*() failed", __func__);
return (-ENOMEM);
}
m->m_pkthdr.PH_vt.vt_nrecs = 0;
igmp_save_context(m, ifp);
m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
sizeof(struct igmp_grouprec)) /
sizeof(in_addr_t);
npbytes = 0;
CTR1(KTR_IGMPV3,
"%s: allocated new packet", __func__);
}
/*
* Append the IGMP group record header to the
* current packet's data area.
* Recalculate pointer to free space for next
* group record, in case m_append() allocated
* a new mbuf or cluster.
*/
memset(&ig, 0, sizeof(ig));
ig.ig_group = inm->inm_addr;
if (!m_append(m, sizeof(ig), (void *)&ig)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3,
"%s: m_append() failed", __func__);
return (-ENOMEM);
}
npbytes += sizeof(struct igmp_grouprec);
if (m != m0) {
/* new packet; offset in c hain */
md = m_getptr(m, npbytes -
sizeof(struct igmp_grouprec), &off);
pig = (struct igmp_grouprec *)(mtod(md,
uint8_t *) + off);
} else {
/* current packet; offset from last append */
md = m_last(m);
pig = (struct igmp_grouprec *)(mtod(md,
uint8_t *) + md->m_len -
sizeof(struct igmp_grouprec));
}
/*
* Begin walking the tree for this record type
* pass, or continue from where we left off
* previously if we had to allocate a new packet.
* Only report deltas in-mode at t1.
* We need not report included sources as allowed
* if we are in inclusive mode on the group,
* however the converse is not true.
*/
rsrcs = 0;
if (nims == NULL)
nims = RB_MIN(ip_msource_tree, &inm->inm_srcs);
RB_FOREACH_FROM(ims, ip_msource_tree, nims) {
CTR2(KTR_IGMPV3, "%s: visit node %s",
__func__, inet_ntoa_haddr(ims->ims_haddr));
now = ims_get_mode(inm, ims, 1);
then = ims_get_mode(inm, ims, 0);
CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d",
__func__, then, now);
if (now == then) {
CTR1(KTR_IGMPV3,
"%s: skip unchanged", __func__);
continue;
}
if (mode == MCAST_EXCLUDE &&
now == MCAST_INCLUDE) {
CTR1(KTR_IGMPV3,
"%s: skip IN src on EX group",
__func__);
continue;
}
nrt = (rectype_t)now;
if (nrt == REC_NONE)
nrt = (rectype_t)(~mode & REC_FULL);
if (schanged++ == 0) {
crt = nrt;
} else if (crt != nrt)
continue;
naddr = htonl(ims->ims_haddr);
if (!m_append(m, sizeof(in_addr_t),
(void *)&naddr)) {
if (m != m0)
m_freem(m);
CTR1(KTR_IGMPV3,
"%s: m_append() failed", __func__);
return (-ENOMEM);
}
nallow += !!(crt == REC_ALLOW);
nblock += !!(crt == REC_BLOCK);
if (++rsrcs == m0srcs)
break;
}
/*
* If we did not append any tree nodes on this
* pass, back out of allocations.
*/
if (rsrcs == 0) {
npbytes -= sizeof(struct igmp_grouprec);
if (m != m0) {
CTR1(KTR_IGMPV3,
"%s: m_free(m)", __func__);
m_freem(m);
} else {
CTR1(KTR_IGMPV3,
"%s: m_adj(m, -ig)", __func__);
m_adj(m, -((int)sizeof(
struct igmp_grouprec)));
}
continue;
}
npbytes += (rsrcs * sizeof(in_addr_t));
if (crt == REC_ALLOW)
pig->ig_type = IGMP_ALLOW_NEW_SOURCES;
else if (crt == REC_BLOCK)
pig->ig_type = IGMP_BLOCK_OLD_SOURCES;
pig->ig_numsrc = htons(rsrcs);
/*
* Count the new group record, and enqueue this
* packet if it wasn't already queued.
*/
m->m_pkthdr.PH_vt.vt_nrecs++;
if (m != m0)
mbufq_enqueue(mq, m);
nbytes += npbytes;
} while (nims != NULL);
drt |= crt;
crt = (~crt & REC_FULL);
}
CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__,
nallow, nblock);
return (nbytes);
}
static int
igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq)
{
struct mbufq *gq;
struct mbuf *m; /* pending state-change */
struct mbuf *m0; /* copy of pending state-change */
struct mbuf *mt; /* last state-change in packet */
int docopy, domerge;
u_int recslen;
docopy = 0;
domerge = 0;
recslen = 0;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
/*
* If there are further pending retransmissions, make a writable
* copy of each queued state-change message before merging.
*/
if (inm->inm_scrv > 0)
docopy = 1;
gq = &inm->inm_scq;
#ifdef KTR
if (mbufq_first(gq) == NULL) {
CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty",
__func__, inm);
}
#endif
m = mbufq_first(gq);
while (m != NULL) {
/*
* Only merge the report into the current packet if
* there is sufficient space to do so; an IGMPv3 report
* packet may only contain 65,535 group records.
* Always use a simple mbuf chain concatentation to do this,
* as large state changes for single groups may have
* allocated clusters.
*/
domerge = 0;
mt = mbufq_last(scq);
if (mt != NULL) {
recslen = m_length(m, NULL);
if ((mt->m_pkthdr.PH_vt.vt_nrecs +
m->m_pkthdr.PH_vt.vt_nrecs <=
IGMP_V3_REPORT_MAXRECS) &&
(mt->m_pkthdr.len + recslen <=
(inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE)))
domerge = 1;
}
if (!domerge && mbufq_full(gq)) {
CTR2(KTR_IGMPV3,
"%s: outbound queue full, skipping whole packet %p",
__func__, m);
mt = m->m_nextpkt;
if (!docopy)
m_freem(m);
m = mt;
continue;
}
if (!docopy) {
CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m);
m0 = mbufq_dequeue(gq);
m = m0->m_nextpkt;
} else {
CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m);
m0 = m_dup(m, M_NOWAIT);
if (m0 == NULL)
return (ENOMEM);
m0->m_nextpkt = NULL;
m = m->m_nextpkt;
}
if (!domerge) {
CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)",
__func__, m0, scq);
mbufq_enqueue(scq, m0);
} else {
struct mbuf *mtl; /* last mbuf of packet mt */
CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)",
__func__, m0, mt);
mtl = m_last(mt);
m0->m_flags &= ~M_PKTHDR;
mt->m_pkthdr.len += recslen;
mt->m_pkthdr.PH_vt.vt_nrecs +=
m0->m_pkthdr.PH_vt.vt_nrecs;
mtl->m_next = m0;
}
}
return (0);
}
/*
* Respond to a pending IGMPv3 General Query.
*/
static void
igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi)
{
struct ifmultiaddr *ifma;
struct ifnet *ifp;
struct in_multi *inm;
int retval, loop;
IN_MULTI_LOCK_ASSERT();
IGMP_LOCK_ASSERT();
KASSERT(igi->igi_version == IGMP_VERSION_3,
("%s: called when version %d", __func__, igi->igi_version));
ifp = igi->igi_ifp;
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
inm = (struct in_multi *)ifma->ifma_protospec;
KASSERT(ifp == inm->inm_ifp,
("%s: inconsistent ifp", __func__));
switch (inm->inm_state) {
case IGMP_NOT_MEMBER:
case IGMP_SILENT_MEMBER:
break;
case IGMP_REPORTING_MEMBER:
case IGMP_IDLE_MEMBER:
case IGMP_LAZY_MEMBER:
case IGMP_SLEEPING_MEMBER:
case IGMP_AWAKENING_MEMBER:
inm->inm_state = IGMP_REPORTING_MEMBER;
retval = igmp_v3_enqueue_group_record(&igi->igi_gq,
inm, 0, 0, 0);
CTR2(KTR_IGMPV3, "%s: enqueue record = %d",
__func__, retval);
break;
case IGMP_G_QUERY_PENDING_MEMBER:
case IGMP_SG_QUERY_PENDING_MEMBER:
case IGMP_LEAVING_MEMBER:
break;
}
}
IF_ADDR_RUNLOCK(ifp);
loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0;
igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop);
/*
* Slew transmission of bursts over 500ms intervals.
*/
if (mbufq_first(&igi->igi_gq) != NULL) {
igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY(
IGMP_RESPONSE_BURST_INTERVAL);
V_interface_timers_running = 1;
}
}
/*
* Transmit the next pending IGMP message in the output queue.
*
* We get called from netisr_processqueue(). A mutex private to igmpoq
* will be acquired and released around this routine.
*
* VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis.
* MRT: Nothing needs to be done, as IGMP traffic is always local to
* a link and uses a link-scope multicast address.
*/
static void
igmp_intr(struct mbuf *m)
{
struct ip_moptions imo;
struct ifnet *ifp;
struct mbuf *ipopts, *m0;
int error;
uint32_t ifindex;
CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m);
/*
* Set VNET image pointer from enqueued mbuf chain
* before doing anything else. Whilst we use interface
* indexes to guard against interface detach, they are
* unique to each VIMAGE and must be retrieved.
*/
CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr));
ifindex = igmp_restore_context(m);
/*
* Check if the ifnet still exists. This limits the scope of
* any race in the absence of a global ifp lock for low cost
* (an array lookup).
*/
ifp = ifnet_byindex(ifindex);
if (ifp == NULL) {
CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.",
__func__, m, ifindex);
m_freem(m);
IPSTAT_INC(ips_noroute);
goto out;
}
ipopts = V_igmp_sendra ? m_raopt : NULL;
imo.imo_multicast_ttl = 1;
imo.imo_multicast_vif = -1;
imo.imo_multicast_loop = (V_ip_mrouter != NULL);
/*
* If the user requested that IGMP traffic be explicitly
* redirected to the loopback interface (e.g. they are running a
* MANET interface and the routing protocol needs to see the
* updates), handle this now.
*/
if (m->m_flags & M_IGMP_LOOP)
imo.imo_multicast_ifp = V_loif;
else
imo.imo_multicast_ifp = ifp;
if (m->m_flags & M_IGMPV2) {
m0 = m;
} else {
m0 = igmp_v3_encap_report(ifp, m);
if (m0 == NULL) {
CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m);
m_freem(m);
IPSTAT_INC(ips_odropped);
goto out;
}
}
igmp_scrub_context(m0);
m_clrprotoflags(m);
m0->m_pkthdr.rcvif = V_loif;
#ifdef MAC
mac_netinet_igmp_send(ifp, m0);
#endif
error = ip_output(m0, ipopts, NULL, 0, &imo, NULL);
if (error) {
CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error);
goto out;
}
IGMPSTAT_INC(igps_snd_reports);
out:
/*
* We must restore the existing vnet pointer before
* continuing as we are run from netisr context.
*/
CURVNET_RESTORE();
}
/*
* Encapsulate an IGMPv3 report.
*
* The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf
* chain has already had its IP/IGMPv3 header prepended. In this case
* the function will not attempt to prepend; the lengths and checksums
* will however be re-computed.
*
* Returns a pointer to the new mbuf chain head, or NULL if the
* allocation failed.
*/
static struct mbuf *
igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m)
{
struct rm_priotracker in_ifa_tracker;
struct igmp_report *igmp;
struct ip *ip;
int hdrlen, igmpreclen;
KASSERT((m->m_flags & M_PKTHDR),
("%s: mbuf chain %p is !M_PKTHDR", __func__, m));
igmpreclen = m_length(m, NULL);
hdrlen = sizeof(struct ip) + sizeof(struct igmp_report);
if (m->m_flags & M_IGMPV3_HDR) {
igmpreclen -= hdrlen;
} else {
M_PREPEND(m, hdrlen, M_NOWAIT);
if (m == NULL)
return (NULL);
m->m_flags |= M_IGMPV3_HDR;
}
CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen);
m->m_data += sizeof(struct ip);
m->m_len -= sizeof(struct ip);
igmp = mtod(m, struct igmp_report *);
igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT;
igmp->ir_rsv1 = 0;
igmp->ir_rsv2 = 0;
igmp->ir_numgrps = htons(m->m_pkthdr.PH_vt.vt_nrecs);
igmp->ir_cksum = 0;
igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen);
m->m_pkthdr.PH_vt.vt_nrecs = 0;
m->m_data -= sizeof(struct ip);
m->m_len += sizeof(struct ip);
ip = mtod(m, struct ip *);
ip->ip_tos = IPTOS_PREC_INTERNETCONTROL;
ip->ip_len = htons(hdrlen + igmpreclen);
ip->ip_off = htons(IP_DF);
ip->ip_p = IPPROTO_IGMP;
ip->ip_sum = 0;
ip->ip_src.s_addr = INADDR_ANY;
if (m->m_flags & M_IGMP_LOOP) {
struct in_ifaddr *ia;
IFP_TO_IA(ifp, ia, &in_ifa_tracker);
if (ia != NULL) {
ip->ip_src = ia->ia_addr.sin_addr;
ifa_free(&ia->ia_ifa);
}
}
ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP);
return (m);
}
#ifdef KTR
static char *
igmp_rec_type_to_str(const int type)
{
switch (type) {
case IGMP_CHANGE_TO_EXCLUDE_MODE:
return "TO_EX";
break;
case IGMP_CHANGE_TO_INCLUDE_MODE:
return "TO_IN";
break;
case IGMP_MODE_IS_EXCLUDE:
return "MODE_EX";
break;
case IGMP_MODE_IS_INCLUDE:
return "MODE_IN";
break;
case IGMP_ALLOW_NEW_SOURCES:
return "ALLOW_NEW";
break;
case IGMP_BLOCK_OLD_SOURCES:
return "BLOCK_OLD";
break;
default:
break;
}
return "unknown";
}
#endif
static void
igmp_init(void *unused __unused)
{
CTR1(KTR_IGMPV3, "%s: initializing", __func__);
IGMP_LOCK_INIT();
m_raopt = igmp_ra_alloc();
netisr_register(&igmp_nh);
}
SYSINIT(igmp_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, igmp_init, NULL);
static void
igmp_uninit(void *unused __unused)
{
CTR1(KTR_IGMPV3, "%s: tearing down", __func__);
netisr_unregister(&igmp_nh);
m_free(m_raopt);
m_raopt = NULL;
IGMP_LOCK_DESTROY();
}
SYSUNINIT(igmp_uninit, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, igmp_uninit, NULL);
static void
vnet_igmp_init(const void *unused __unused)
{
CTR1(KTR_IGMPV3, "%s: initializing", __func__);
LIST_INIT(&V_igi_head);
}
VNET_SYSINIT(vnet_igmp_init, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_igmp_init,
NULL);
static void
vnet_igmp_uninit(const void *unused __unused)
{
CTR1(KTR_IGMPV3, "%s: tearing down", __func__);
KASSERT(LIST_EMPTY(&V_igi_head),
("%s: igi list not empty; ifnets not detached?", __func__));
}
VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
vnet_igmp_uninit, NULL);
static int
igmp_modevent(module_t mod, int type, void *unused __unused)
{
switch (type) {
case MOD_LOAD:
case MOD_UNLOAD:
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t igmp_mod = {
"igmp",
igmp_modevent,
0
};
DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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