2 * Copyright (c) 2007-2009 Bruce Simpson.
3 * Copyright (c) 1988 Stephen Deering.
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Stephen Deering of Stanford University.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)igmp.c 8.1 (Berkeley) 7/19/93
38 * Internet Group Management Protocol (IGMP) routines.
39 * [RFC1112, RFC2236, RFC3376]
41 * Written by Steve Deering, Stanford, May 1988.
42 * Modified by Rosen Sharma, Stanford, Aug 1994.
43 * Modified by Bill Fenner, Xerox PARC, Feb 1995.
44 * Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995.
45 * Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson.
47 * MULTICAST Revision: 3.5.1.4
50 #include <sys/cdefs.h>
51 __FBSDID("$FreeBSD$");
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/module.h>
56 #include <sys/malloc.h>
58 #include <sys/socket.h>
59 #include <sys/protosw.h>
60 #include <sys/kernel.h>
61 #include <sys/sysctl.h>
62 #include <sys/vimage.h>
64 #include <sys/condvar.h>
67 #include <net/netisr.h>
70 #include <netinet/in.h>
71 #include <netinet/in_var.h>
72 #include <netinet/in_systm.h>
73 #include <netinet/ip.h>
74 #include <netinet/ip_var.h>
75 #include <netinet/ip_options.h>
76 #include <netinet/igmp.h>
77 #include <netinet/igmp_var.h>
79 #include <machine/in_cksum.h>
81 #include <security/mac/mac_framework.h>
84 #define KTR_IGMPV3 KTR_INET
87 static struct igmp_ifinfo *
88 igi_alloc_locked(struct ifnet *);
89 static void igi_delete_locked(const struct ifnet *);
90 static void igmp_dispatch_queue(struct ifqueue *, int, const int);
91 static void igmp_fasttimo_vnet(void);
92 static void igmp_final_leave(struct in_multi *, struct igmp_ifinfo *);
93 static int igmp_handle_state_change(struct in_multi *,
94 struct igmp_ifinfo *);
95 static int igmp_initial_join(struct in_multi *, struct igmp_ifinfo *);
96 static int igmp_input_v1_query(struct ifnet *, const struct ip *,
98 static int igmp_input_v2_query(struct ifnet *, const struct ip *,
100 static int igmp_input_v3_query(struct ifnet *, const struct ip *,
101 /*const*/ struct igmpv3 *);
102 static int igmp_input_v3_group_query(struct in_multi *,
103 struct igmp_ifinfo *, int, /*const*/ struct igmpv3 *);
104 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *,
105 /*const*/ struct igmp *);
106 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *,
107 /*const*/ struct igmp *);
108 static void igmp_intr(struct mbuf *);
109 static int igmp_isgroupreported(const struct in_addr);
113 static char * igmp_rec_type_to_str(const int);
115 static void igmp_set_version(struct igmp_ifinfo *, const int);
116 static void igmp_slowtimo_vnet(void);
117 static void igmp_sysinit(void);
118 static int igmp_v1v2_queue_report(struct in_multi *, const int);
119 static void igmp_v1v2_process_group_timer(struct in_multi *, const int);
120 static void igmp_v1v2_process_querier_timers(struct igmp_ifinfo *);
121 static void igmp_v2_update_group(struct in_multi *, const int);
122 static void igmp_v3_cancel_link_timers(struct igmp_ifinfo *);
123 static void igmp_v3_dispatch_general_query(struct igmp_ifinfo *);
125 igmp_v3_encap_report(struct ifnet *, struct mbuf *);
126 static int igmp_v3_enqueue_group_record(struct ifqueue *,
127 struct in_multi *, const int, const int, const int);
128 static int igmp_v3_enqueue_filter_change(struct ifqueue *,
130 static void igmp_v3_process_group_timers(struct igmp_ifinfo *,
131 struct ifqueue *, struct ifqueue *, struct in_multi *,
133 static int igmp_v3_merge_state_changes(struct in_multi *,
135 static void igmp_v3_suppress_group_record(struct in_multi *);
136 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS);
137 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS);
138 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS);
140 static vnet_attach_fn vnet_igmp_iattach;
141 static vnet_detach_fn vnet_igmp_idetach;
143 static const struct netisr_handler igmp_nh = {
145 .nh_handler = igmp_intr,
146 .nh_proto = NETISR_IGMP,
147 .nh_policy = NETISR_POLICY_SOURCE,
151 * System-wide globals.
153 * Unlocked access to these is OK, except for the global IGMP output
154 * queue. The IGMP subsystem lock ends up being system-wide for the moment,
155 * because all VIMAGEs have to share a global output queue, as netisrs
156 * themselves are not virtualized.
159 * * The permitted lock order is: IN_MULTI_LOCK, IGMP_LOCK, IF_ADDR_LOCK.
160 * Any may be taken independently; if any are held at the same
161 * time, the above lock order must be followed.
162 * * All output is delegated to the netisr.
163 * Now that Giant has been eliminated, the netisr may be inlined.
164 * * IN_MULTI_LOCK covers in_multi.
165 * * IGMP_LOCK covers igmp_ifinfo and any global variables in this file,
166 * including the output queue.
167 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of
168 * per-link state iterators.
169 * * igmp_ifinfo is valid as long as PF_INET is attached to the interface,
170 * therefore it is not refcounted.
171 * We allow unlocked reads of igmp_ifinfo when accessed via in_multi.
174 * * IGMP acquires its own reference every time an in_multi is passed to
175 * it and the group is being joined for the first time.
176 * * IGMP releases its reference(s) on in_multi in a deferred way,
177 * because the operations which process the release run as part of
178 * a loop whose control variables are directly affected by the release
179 * (that, and not recursing on the IF_ADDR_LOCK).
181 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds
182 * to a vnet in ifp->if_vnet.
184 * SMPng: XXX We may potentially race operations on ifma_protospec.
185 * The problem is that we currently lack a clean way of taking the
186 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing,
187 * as anything which modifies ifma needs to be covered by that lock.
188 * So check for ifma_protospec being NULL before proceeding.
192 struct mbuf *m_raopt; /* Router Alert option */
193 MALLOC_DEFINE(M_IGMP, "igmp", "igmp state");
196 * VIMAGE-wide globals.
198 * The IGMPv3 timers themselves need to run per-image, however,
199 * protosw timers run globally (see tcp).
200 * An ifnet can only be in one vimage at a time, and the loopback
201 * ifnet, loif, is itself virtualized.
202 * It would otherwise be possible to seriously hose IGMP state,
203 * and create inconsistencies in upstream multicast routing, if you have
204 * multiple VIMAGEs running on the same link joining different multicast
205 * groups, UNLESS the "primary IP address" is different. This is because
206 * IGMP for IPv4 does not force link-local addresses to be used for each
207 * node, unlike MLD for IPv6.
208 * Obviously the IGMPv3 per-interface state has per-vimage granularity
211 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection
212 * policy to control the address used by IGMP on the link.
214 static VNET_DEFINE(int, interface_timers_running); /* IGMPv3 general
216 static VNET_DEFINE(int, state_change_timers_running); /* IGMPv3 state-change
218 static VNET_DEFINE(int, current_state_timers_running); /* IGMPv1/v2 host
219 * report; IGMPv3 g/sg
222 #define V_interface_timers_running VNET(interface_timers_running)
223 #define V_state_change_timers_running VNET(state_change_timers_running)
224 #define V_current_state_timers_running VNET(current_state_timers_running)
226 static VNET_DEFINE(LIST_HEAD(, igmp_ifinfo), igi_head);
227 static VNET_DEFINE(struct igmpstat, igmpstat);
228 static VNET_DEFINE(struct timeval, igmp_gsrdelay) = {10, 0};
230 #define V_igi_head VNET(igi_head)
231 #define V_igmpstat VNET(igmpstat)
232 #define V_igmp_gsrdelay VNET(igmp_gsrdelay)
234 static VNET_DEFINE(int, igmp_recvifkludge) = 1;
235 static VNET_DEFINE(int, igmp_sendra) = 1;
236 static VNET_DEFINE(int, igmp_sendlocal) = 1;
237 static VNET_DEFINE(int, igmp_v1enable) = 1;
238 static VNET_DEFINE(int, igmp_v2enable) = 1;
239 static VNET_DEFINE(int, igmp_legacysupp);
240 static VNET_DEFINE(int, igmp_default_version) = IGMP_VERSION_3;
242 #define V_igmp_recvifkludge VNET(igmp_recvifkludge)
243 #define V_igmp_sendra VNET(igmp_sendra)
244 #define V_igmp_sendlocal VNET(igmp_sendlocal)
245 #define V_igmp_v1enable VNET(igmp_v1enable)
246 #define V_igmp_v2enable VNET(igmp_v2enable)
247 #define V_igmp_legacysupp VNET(igmp_legacysupp)
248 #define V_igmp_default_version VNET(igmp_default_version)
251 * Virtualized sysctls.
253 SYSCTL_VNET_STRUCT(_net_inet_igmp, IGMPCTL_STATS, stats, CTLFLAG_RW,
254 &VNET_NAME(igmpstat), igmpstat, "");
255 SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_RW,
256 &VNET_NAME(igmp_recvifkludge), 0,
257 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address");
258 SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_RW,
259 &VNET_NAME(igmp_sendra), 0,
260 "Send IP Router Alert option in IGMPv2/v3 messages");
261 SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_RW,
262 &VNET_NAME(igmp_sendlocal), 0,
263 "Send IGMP membership reports for 224.0.0.0/24 groups");
264 SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_RW,
265 &VNET_NAME(igmp_v1enable), 0,
266 "Enable backwards compatibility with IGMPv1");
267 SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_RW,
268 &VNET_NAME(igmp_v2enable), 0,
269 "Enable backwards compatibility with IGMPv2");
270 SYSCTL_VNET_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_RW,
271 &VNET_NAME(igmp_legacysupp), 0,
272 "Allow v1/v2 reports to suppress v3 group responses");
273 SYSCTL_VNET_PROC(_net_inet_igmp, OID_AUTO, default_version,
274 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
275 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I",
276 "Default version of IGMP to run on each interface");
277 SYSCTL_VNET_PROC(_net_inet_igmp, OID_AUTO, gsrdelay,
278 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
279 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I",
280 "Rate limit for IGMPv3 Group-and-Source queries in seconds");
283 * Non-virtualized sysctls.
285 SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, CTLFLAG_RD | CTLFLAG_MPSAFE,
286 sysctl_igmp_ifinfo, "Per-interface IGMPv3 state");
289 igmp_save_context(struct mbuf *m, struct ifnet *ifp)
293 m->m_pkthdr.header = ifp->if_vnet;
295 m->m_pkthdr.flowid = ifp->if_index;
299 igmp_scrub_context(struct mbuf *m)
302 m->m_pkthdr.header = NULL;
303 m->m_pkthdr.flowid = 0;
307 static __inline char *
308 inet_ntoa_haddr(in_addr_t haddr)
312 ia.s_addr = htonl(haddr);
313 return (inet_ntoa(ia));
318 * Restore context from a queued IGMP output chain.
319 * Return saved ifindex.
321 * VIMAGE: The assertion is there to make sure that we
322 * actually called CURVNET_SET() with what's in the mbuf chain.
324 static __inline uint32_t
325 igmp_restore_context(struct mbuf *m)
329 #if defined(VIMAGE) && defined(INVARIANTS)
330 KASSERT(curvnet == (m->m_pkthdr.header),
331 ("%s: called when curvnet was not restored", __func__));
334 return (m->m_pkthdr.flowid);
338 * Retrieve or set default IGMP version.
340 * VIMAGE: Assume curvnet set by caller.
341 * SMPng: NOTE: Serialized by IGMP lock.
344 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS)
349 error = sysctl_wire_old_buffer(req, sizeof(int));
355 new = V_igmp_default_version;
357 error = sysctl_handle_int(oidp, &new, 0, req);
358 if (error || !req->newptr)
361 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) {
366 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d",
367 V_igmp_default_version, new);
369 V_igmp_default_version = new;
377 * Retrieve or set threshold between group-source queries in seconds.
379 * VIMAGE: Assume curvnet set by caller.
380 * SMPng: NOTE: Serialized by IGMP lock.
383 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS)
388 error = sysctl_wire_old_buffer(req, sizeof(int));
394 i = V_igmp_gsrdelay.tv_sec;
396 error = sysctl_handle_int(oidp, &i, 0, req);
397 if (error || !req->newptr)
400 if (i < -1 || i >= 60) {
405 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d",
406 V_igmp_gsrdelay.tv_sec, i);
407 V_igmp_gsrdelay.tv_sec = i;
415 * Expose struct igmp_ifinfo to userland, keyed by ifindex.
416 * For use by ifmcstat(8).
418 * SMPng: NOTE: Does an unlocked ifindex space read.
419 * VIMAGE: Assume curvnet set by caller. The node handler itself
420 * is not directly virtualized.
423 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS)
429 struct igmp_ifinfo *igi;
434 if (req->newptr != NULL)
440 error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo));
447 if (name[0] <= 0 || name[0] > V_if_index) {
454 ifp = ifnet_byindex(name[0]);
458 LIST_FOREACH(igi, &V_igi_head, igi_link) {
459 if (ifp == igi->igi_ifp) {
460 error = SYSCTL_OUT(req, igi,
461 sizeof(struct igmp_ifinfo));
473 * Dispatch an entire queue of pending packet chains
475 * VIMAGE: Assumes the vnet pointer has been set.
478 igmp_dispatch_queue(struct ifqueue *ifq, int limit, const int loop)
486 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, ifq, m);
488 m->m_flags |= M_IGMP_LOOP;
489 netisr_dispatch(NETISR_IGMP, m);
496 * Filter outgoing IGMP report state by group.
498 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1).
499 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are
500 * disabled for all groups in the 224.0.0.0/24 link-local scope. However,
501 * this may break certain IGMP snooping switches which rely on the old
504 * Return zero if the given group is one for which IGMP reports
505 * should be suppressed, or non-zero if reports should be issued.
508 igmp_isgroupreported(const struct in_addr addr)
511 if (in_allhosts(addr) ||
512 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr)))))
519 * Construct a Router Alert option to use in outgoing packets.
527 MGET(m, M_DONTWAIT, MT_DATA);
528 p = mtod(m, struct ipoption *);
529 p->ipopt_dst.s_addr = INADDR_ANY;
530 p->ipopt_list[0] = IPOPT_RA; /* Router Alert Option */
531 p->ipopt_list[1] = 0x04; /* 4 bytes long */
532 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */
533 p->ipopt_list[3] = 0x00; /* pad byte */
534 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1];
540 * Attach IGMP when PF_INET is attached to an interface.
543 igmp_domifattach(struct ifnet *ifp)
545 struct igmp_ifinfo *igi;
547 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)",
548 __func__, ifp, ifp->if_xname);
552 igi = igi_alloc_locked(ifp);
553 if (!(ifp->if_flags & IFF_MULTICAST))
554 igi->igi_flags |= IGIF_SILENT;
562 * VIMAGE: assume curvnet set by caller.
564 static struct igmp_ifinfo *
565 igi_alloc_locked(/*const*/ struct ifnet *ifp)
567 struct igmp_ifinfo *igi;
571 igi = malloc(sizeof(struct igmp_ifinfo), M_IGMP, M_NOWAIT|M_ZERO);
576 igi->igi_version = V_igmp_default_version;
578 igi->igi_rv = IGMP_RV_INIT;
579 igi->igi_qi = IGMP_QI_INIT;
580 igi->igi_qri = IGMP_QRI_INIT;
581 igi->igi_uri = IGMP_URI_INIT;
583 SLIST_INIT(&igi->igi_relinmhead);
586 * Responses to general queries are subject to bounds.
588 IFQ_SET_MAXLEN(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS);
590 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link);
592 CTR2(KTR_IGMPV3, "allocate igmp_ifinfo for ifp %p(%s)",
602 * NOTE: Some finalization tasks need to run before the protocol domain
603 * is detached, but also before the link layer does its cleanup.
605 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK().
606 * XXX This is also bitten by unlocked ifma_protospec access.
609 igmp_ifdetach(struct ifnet *ifp)
611 struct igmp_ifinfo *igi;
612 struct ifmultiaddr *ifma;
613 struct in_multi *inm, *tinm;
615 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp,
620 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
621 if (igi->igi_version == IGMP_VERSION_3) {
623 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
624 if (ifma->ifma_addr->sa_family != AF_INET ||
625 ifma->ifma_protospec == NULL)
628 KASSERT(ifma->ifma_protospec != NULL,
629 ("%s: ifma_protospec is NULL", __func__));
631 inm = (struct in_multi *)ifma->ifma_protospec;
632 if (inm->inm_state == IGMP_LEAVING_MEMBER) {
633 SLIST_INSERT_HEAD(&igi->igi_relinmhead,
636 inm_clear_recorded(inm);
640 * Free the in_multi reference(s) for this IGMP lifecycle.
642 SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, inm_nrele,
644 SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele);
645 inm_release_locked(inm);
653 * Hook for domifdetach.
656 igmp_domifdetach(struct ifnet *ifp)
658 struct igmp_ifinfo *igi;
660 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)",
661 __func__, ifp, ifp->if_xname);
665 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
666 igi_delete_locked(ifp);
672 igi_delete_locked(const struct ifnet *ifp)
674 struct igmp_ifinfo *igi, *tigi;
676 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifinfo for ifp %p(%s)",
677 __func__, ifp, ifp->if_xname);
681 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) {
682 if (igi->igi_ifp == ifp) {
684 * Free deferred General Query responses.
686 _IF_DRAIN(&igi->igi_gq);
688 LIST_REMOVE(igi, igi_link);
690 KASSERT(SLIST_EMPTY(&igi->igi_relinmhead),
691 ("%s: there are dangling in_multi references",
700 panic("%s: igmp_ifinfo not found for ifp %p\n", __func__, ifp);
705 * Process a received IGMPv1 query.
706 * Return non-zero if the message should be dropped.
708 * VIMAGE: The curvnet pointer is derived from the input ifp.
711 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip,
712 const struct igmp *igmp)
714 struct ifmultiaddr *ifma;
715 struct igmp_ifinfo *igi;
716 struct in_multi *inm;
719 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to
720 * 224.0.0.1. They are always treated as General Queries.
721 * igmp_group is always ignored. Do not drop it as a userland
722 * daemon may wish to see it.
723 * XXX SMPng: unlocked increments in igmpstat assumed atomic.
725 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) {
726 IGMPSTAT_INC(igps_rcv_badqueries);
729 IGMPSTAT_INC(igps_rcv_gen_queries);
734 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
735 KASSERT(igi != NULL, ("%s: no igmp_ifinfo for ifp %p", __func__, ifp));
737 if (igi->igi_flags & IGIF_LOOPBACK) {
738 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)",
744 * Switch to IGMPv1 host compatibility mode.
746 igmp_set_version(igi, IGMP_VERSION_1);
748 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname);
751 * Start the timers in all of our group records
752 * for the interface on which the query arrived,
753 * except those which are already running.
756 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
757 if (ifma->ifma_addr->sa_family != AF_INET ||
758 ifma->ifma_protospec == NULL)
760 inm = (struct in_multi *)ifma->ifma_protospec;
761 if (inm->inm_timer != 0)
763 switch (inm->inm_state) {
764 case IGMP_NOT_MEMBER:
765 case IGMP_SILENT_MEMBER:
767 case IGMP_G_QUERY_PENDING_MEMBER:
768 case IGMP_SG_QUERY_PENDING_MEMBER:
769 case IGMP_REPORTING_MEMBER:
770 case IGMP_IDLE_MEMBER:
771 case IGMP_LAZY_MEMBER:
772 case IGMP_SLEEPING_MEMBER:
773 case IGMP_AWAKENING_MEMBER:
774 inm->inm_state = IGMP_REPORTING_MEMBER;
775 inm->inm_timer = IGMP_RANDOM_DELAY(
776 IGMP_V1V2_MAX_RI * PR_FASTHZ);
777 V_current_state_timers_running = 1;
779 case IGMP_LEAVING_MEMBER:
793 * Process a received IGMPv2 general or group-specific query.
796 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip,
797 const struct igmp *igmp)
799 struct ifmultiaddr *ifma;
800 struct igmp_ifinfo *igi;
801 struct in_multi *inm;
802 int is_general_query;
805 is_general_query = 0;
808 * Validate address fields upfront.
809 * XXX SMPng: unlocked increments in igmpstat assumed atomic.
811 if (in_nullhost(igmp->igmp_group)) {
813 * IGMPv2 General Query.
814 * If this was not sent to the all-hosts group, ignore it.
816 if (!in_allhosts(ip->ip_dst))
818 IGMPSTAT_INC(igps_rcv_gen_queries);
819 is_general_query = 1;
821 /* IGMPv2 Group-Specific Query. */
822 IGMPSTAT_INC(igps_rcv_group_queries);
828 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
829 KASSERT(igi != NULL, ("%s: no igmp_ifinfo for ifp %p", __func__, ifp));
831 if (igi->igi_flags & IGIF_LOOPBACK) {
832 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)",
838 * Ignore v2 query if in v1 Compatibility Mode.
840 if (igi->igi_version == IGMP_VERSION_1)
843 igmp_set_version(igi, IGMP_VERSION_2);
845 timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE;
849 if (is_general_query) {
851 * For each reporting group joined on this
852 * interface, kick the report timer.
854 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)",
857 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
858 if (ifma->ifma_addr->sa_family != AF_INET ||
859 ifma->ifma_protospec == NULL)
861 inm = (struct in_multi *)ifma->ifma_protospec;
862 igmp_v2_update_group(inm, timer);
867 * Group-specific IGMPv2 query, we need only
868 * look up the single group to process it.
870 inm = inm_lookup(ifp, igmp->igmp_group);
872 CTR3(KTR_IGMPV3, "process v2 query %s on ifp %p(%s)",
873 inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
874 igmp_v2_update_group(inm, timer);
886 * Update the report timer on a group in response to an IGMPv2 query.
888 * If we are becoming the reporting member for this group, start the timer.
889 * If we already are the reporting member for this group, and timer is
890 * below the threshold, reset it.
892 * We may be updating the group for the first time since we switched
893 * to IGMPv3. If we are, then we must clear any recorded source lists,
894 * and transition to REPORTING state; the group timer is overloaded
895 * for group and group-source query responses.
897 * Unlike IGMPv3, the delay per group should be jittered
898 * to avoid bursts of IGMPv2 reports.
901 igmp_v2_update_group(struct in_multi *inm, const int timer)
904 CTR4(KTR_IGMPV3, "%s: %s/%s timer=%d", __func__,
905 inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname, timer);
907 IN_MULTI_LOCK_ASSERT();
909 switch (inm->inm_state) {
910 case IGMP_NOT_MEMBER:
911 case IGMP_SILENT_MEMBER:
913 case IGMP_REPORTING_MEMBER:
914 if (inm->inm_timer != 0 &&
915 inm->inm_timer <= timer) {
916 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, "
917 "skipping.", __func__);
921 case IGMP_SG_QUERY_PENDING_MEMBER:
922 case IGMP_G_QUERY_PENDING_MEMBER:
923 case IGMP_IDLE_MEMBER:
924 case IGMP_LAZY_MEMBER:
925 case IGMP_AWAKENING_MEMBER:
926 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__);
927 inm->inm_state = IGMP_REPORTING_MEMBER;
928 inm->inm_timer = IGMP_RANDOM_DELAY(timer);
929 V_current_state_timers_running = 1;
931 case IGMP_SLEEPING_MEMBER:
932 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__);
933 inm->inm_state = IGMP_AWAKENING_MEMBER;
935 case IGMP_LEAVING_MEMBER:
941 * Process a received IGMPv3 general, group-specific or
942 * group-and-source-specific query.
943 * Assumes m has already been pulled up to the full IGMP message length.
944 * Return 0 if successful, otherwise an appropriate error code is returned.
947 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip,
948 /*const*/ struct igmpv3 *igmpv3)
950 struct igmp_ifinfo *igi;
951 struct in_multi *inm;
952 int is_general_query;
953 uint32_t maxresp, nsrc, qqi;
957 is_general_query = 0;
959 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname);
961 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */
962 if (maxresp >= 128) {
963 maxresp = IGMP_MANT(igmpv3->igmp_code) <<
964 (IGMP_EXP(igmpv3->igmp_code) + 3);
968 * Robustness must never be less than 2 for on-wire IGMPv3.
969 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make
970 * an exception for interfaces whose IGMPv3 state changes
971 * are redirected to loopback (e.g. MANET).
973 qrv = IGMP_QRV(igmpv3->igmp_misc);
975 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__,
980 qqi = igmpv3->igmp_qqi;
982 qqi = IGMP_MANT(igmpv3->igmp_qqi) <<
983 (IGMP_EXP(igmpv3->igmp_qqi) + 3);
986 timer = maxresp * PR_FASTHZ / IGMP_TIMER_SCALE;
990 nsrc = ntohs(igmpv3->igmp_numsrc);
993 * Validate address fields and versions upfront before
994 * accepting v3 query.
995 * XXX SMPng: Unlocked access to igmpstat counters here.
997 if (in_nullhost(igmpv3->igmp_group)) {
999 * IGMPv3 General Query.
1001 * General Queries SHOULD be directed to 224.0.0.1.
1002 * A general query with a source list has undefined
1003 * behaviour; discard it.
1005 IGMPSTAT_INC(igps_rcv_gen_queries);
1006 if (!in_allhosts(ip->ip_dst) || nsrc > 0) {
1007 IGMPSTAT_INC(igps_rcv_badqueries);
1010 is_general_query = 1;
1012 /* Group or group-source specific query. */
1014 IGMPSTAT_INC(igps_rcv_group_queries);
1016 IGMPSTAT_INC(igps_rcv_gsr_queries);
1022 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
1023 KASSERT(igi != NULL, ("%s: no igmp_ifinfo for ifp %p", __func__, ifp));
1025 if (igi->igi_flags & IGIF_LOOPBACK) {
1026 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)",
1027 ifp, ifp->if_xname);
1032 * Discard the v3 query if we're in Compatibility Mode.
1033 * The RFC is not obviously worded that hosts need to stay in
1034 * compatibility mode until the Old Version Querier Present
1037 if (igi->igi_version != IGMP_VERSION_3) {
1038 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)",
1039 igi->igi_version, ifp, ifp->if_xname);
1043 igmp_set_version(igi, IGMP_VERSION_3);
1046 igi->igi_qri = maxresp;
1048 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi,
1051 if (is_general_query) {
1053 * Schedule a current-state report on this ifp for
1054 * all groups, possibly containing source lists.
1055 * If there is a pending General Query response
1056 * scheduled earlier than the selected delay, do
1057 * not schedule any other reports.
1058 * Otherwise, reset the interface timer.
1060 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)",
1061 ifp, ifp->if_xname);
1062 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) {
1063 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer);
1064 V_interface_timers_running = 1;
1068 * Group-source-specific queries are throttled on
1069 * a per-group basis to defeat denial-of-service attempts.
1070 * Queries for groups we are not a member of on this
1071 * link are simply ignored.
1073 inm = inm_lookup(ifp, igmpv3->igmp_group);
1077 if (!ratecheck(&inm->inm_lastgsrtv,
1078 &V_igmp_gsrdelay)) {
1079 CTR1(KTR_IGMPV3, "%s: GS query throttled.",
1081 IGMPSTAT_INC(igps_drop_gsr_queries);
1085 CTR3(KTR_IGMPV3, "process v3 %s query on ifp %p(%s)",
1086 inet_ntoa(igmpv3->igmp_group), ifp, ifp->if_xname);
1088 * If there is a pending General Query response
1089 * scheduled sooner than the selected delay, no
1090 * further report need be scheduled.
1091 * Otherwise, prepare to respond to the
1092 * group-specific or group-and-source query.
1094 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer)
1095 igmp_input_v3_group_query(inm, igi, timer, igmpv3);
1106 * Process a recieved IGMPv3 group-specific or group-and-source-specific
1108 * Return <0 if any error occured. Currently this is ignored.
1111 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifinfo *igi,
1112 int timer, /*const*/ struct igmpv3 *igmpv3)
1117 IN_MULTI_LOCK_ASSERT();
1122 switch (inm->inm_state) {
1123 case IGMP_NOT_MEMBER:
1124 case IGMP_SILENT_MEMBER:
1125 case IGMP_SLEEPING_MEMBER:
1126 case IGMP_LAZY_MEMBER:
1127 case IGMP_AWAKENING_MEMBER:
1128 case IGMP_IDLE_MEMBER:
1129 case IGMP_LEAVING_MEMBER:
1132 case IGMP_REPORTING_MEMBER:
1133 case IGMP_G_QUERY_PENDING_MEMBER:
1134 case IGMP_SG_QUERY_PENDING_MEMBER:
1138 nsrc = ntohs(igmpv3->igmp_numsrc);
1141 * Deal with group-specific queries upfront.
1142 * If any group query is already pending, purge any recorded
1143 * source-list state if it exists, and schedule a query response
1144 * for this group-specific query.
1147 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER ||
1148 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) {
1149 inm_clear_recorded(inm);
1150 timer = min(inm->inm_timer, timer);
1152 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER;
1153 inm->inm_timer = IGMP_RANDOM_DELAY(timer);
1154 V_current_state_timers_running = 1;
1159 * Deal with the case where a group-and-source-specific query has
1160 * been received but a group-specific query is already pending.
1162 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) {
1163 timer = min(inm->inm_timer, timer);
1164 inm->inm_timer = IGMP_RANDOM_DELAY(timer);
1165 V_current_state_timers_running = 1;
1170 * Finally, deal with the case where a group-and-source-specific
1171 * query has been received, where a response to a previous g-s-r
1172 * query exists, or none exists.
1173 * In this case, we need to parse the source-list which the Querier
1174 * has provided us with and check if we have any source list filter
1175 * entries at T1 for these sources. If we do not, there is no need
1176 * schedule a report and the query may be dropped.
1177 * If we do, we must record them and schedule a current-state
1178 * report for those sources.
1179 * FIXME: Handling source lists larger than 1 mbuf requires that
1180 * we pass the mbuf chain pointer down to this function, and use
1181 * m_getptr() to walk the chain.
1183 if (inm->inm_nsrc > 0) {
1184 const struct in_addr *ap;
1187 ap = (const struct in_addr *)(igmpv3 + 1);
1189 for (i = 0; i < nsrc; i++, ap++) {
1190 retval = inm_record_source(inm, ap->s_addr);
1193 nrecorded += retval;
1195 if (nrecorded > 0) {
1197 "%s: schedule response to SG query", __func__);
1198 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER;
1199 inm->inm_timer = IGMP_RANDOM_DELAY(timer);
1200 V_current_state_timers_running = 1;
1208 * Process a received IGMPv1 host membership report.
1210 * NOTE: 0.0.0.0 workaround breaks const correctness.
1213 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip,
1214 /*const*/ struct igmp *igmp)
1216 struct in_ifaddr *ia;
1217 struct in_multi *inm;
1219 IGMPSTAT_INC(igps_rcv_reports);
1221 if (ifp->if_flags & IFF_LOOPBACK)
1224 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr) ||
1225 !in_hosteq(igmp->igmp_group, ip->ip_dst))) {
1226 IGMPSTAT_INC(igps_rcv_badreports);
1231 * RFC 3376, Section 4.2.13, 9.2, 9.3:
1232 * Booting clients may use the source address 0.0.0.0. Some
1233 * IGMP daemons may not know how to use IP_RECVIF to determine
1234 * the interface upon which this message was received.
1235 * Replace 0.0.0.0 with the subnet address if told to do so.
1237 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) {
1240 ip->ip_src.s_addr = htonl(ia->ia_subnet);
1241 ifa_free(&ia->ia_ifa);
1245 CTR3(KTR_IGMPV3, "process v1 report %s on ifp %p(%s)",
1246 inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
1249 * IGMPv1 report suppression.
1250 * If we are a member of this group, and our membership should be
1251 * reported, stop our group timer and transition to the 'lazy' state.
1254 inm = inm_lookup(ifp, igmp->igmp_group);
1256 struct igmp_ifinfo *igi;
1260 KASSERT(igi != NULL,
1261 ("%s: no igi for ifp %p", __func__, ifp));
1265 IGMPSTAT_INC(igps_rcv_ourreports);
1268 * If we are in IGMPv3 host mode, do not allow the
1269 * other host's IGMPv1 report to suppress our reports
1270 * unless explicitly configured to do so.
1272 if (igi->igi_version == IGMP_VERSION_3) {
1273 if (V_igmp_legacysupp)
1274 igmp_v3_suppress_group_record(inm);
1280 switch (inm->inm_state) {
1281 case IGMP_NOT_MEMBER:
1282 case IGMP_SILENT_MEMBER:
1284 case IGMP_IDLE_MEMBER:
1285 case IGMP_LAZY_MEMBER:
1286 case IGMP_AWAKENING_MEMBER:
1288 "report suppressed for %s on ifp %p(%s)",
1289 inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
1290 case IGMP_SLEEPING_MEMBER:
1291 inm->inm_state = IGMP_SLEEPING_MEMBER;
1293 case IGMP_REPORTING_MEMBER:
1295 "report suppressed for %s on ifp %p(%s)",
1296 inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
1297 if (igi->igi_version == IGMP_VERSION_1)
1298 inm->inm_state = IGMP_LAZY_MEMBER;
1299 else if (igi->igi_version == IGMP_VERSION_2)
1300 inm->inm_state = IGMP_SLEEPING_MEMBER;
1302 case IGMP_G_QUERY_PENDING_MEMBER:
1303 case IGMP_SG_QUERY_PENDING_MEMBER:
1304 case IGMP_LEAVING_MEMBER:
1316 * Process a received IGMPv2 host membership report.
1318 * NOTE: 0.0.0.0 workaround breaks const correctness.
1321 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip,
1322 /*const*/ struct igmp *igmp)
1324 struct in_ifaddr *ia;
1325 struct in_multi *inm;
1328 * Make sure we don't hear our own membership report. Fast
1329 * leave requires knowing that we are the only member of a
1333 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) {
1334 ifa_free(&ia->ia_ifa);
1338 IGMPSTAT_INC(igps_rcv_reports);
1340 if (ifp->if_flags & IFF_LOOPBACK) {
1342 ifa_free(&ia->ia_ifa);
1346 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) ||
1347 !in_hosteq(igmp->igmp_group, ip->ip_dst)) {
1349 ifa_free(&ia->ia_ifa);
1350 IGMPSTAT_INC(igps_rcv_badreports);
1355 * RFC 3376, Section 4.2.13, 9.2, 9.3:
1356 * Booting clients may use the source address 0.0.0.0. Some
1357 * IGMP daemons may not know how to use IP_RECVIF to determine
1358 * the interface upon which this message was received.
1359 * Replace 0.0.0.0 with the subnet address if told to do so.
1361 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) {
1363 ip->ip_src.s_addr = htonl(ia->ia_subnet);
1366 ifa_free(&ia->ia_ifa);
1368 CTR3(KTR_IGMPV3, "process v2 report %s on ifp %p(%s)",
1369 inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
1372 * IGMPv2 report suppression.
1373 * If we are a member of this group, and our membership should be
1374 * reported, and our group timer is pending or about to be reset,
1375 * stop our group timer by transitioning to the 'lazy' state.
1378 inm = inm_lookup(ifp, igmp->igmp_group);
1380 struct igmp_ifinfo *igi;
1383 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp));
1385 IGMPSTAT_INC(igps_rcv_ourreports);
1388 * If we are in IGMPv3 host mode, do not allow the
1389 * other host's IGMPv1 report to suppress our reports
1390 * unless explicitly configured to do so.
1392 if (igi->igi_version == IGMP_VERSION_3) {
1393 if (V_igmp_legacysupp)
1394 igmp_v3_suppress_group_record(inm);
1400 switch (inm->inm_state) {
1401 case IGMP_NOT_MEMBER:
1402 case IGMP_SILENT_MEMBER:
1403 case IGMP_SLEEPING_MEMBER:
1405 case IGMP_REPORTING_MEMBER:
1406 case IGMP_IDLE_MEMBER:
1407 case IGMP_AWAKENING_MEMBER:
1409 "report suppressed for %s on ifp %p(%s)",
1410 inet_ntoa(igmp->igmp_group), ifp, ifp->if_xname);
1411 case IGMP_LAZY_MEMBER:
1412 inm->inm_state = IGMP_LAZY_MEMBER;
1414 case IGMP_G_QUERY_PENDING_MEMBER:
1415 case IGMP_SG_QUERY_PENDING_MEMBER:
1416 case IGMP_LEAVING_MEMBER:
1428 igmp_input(struct mbuf *m, int off)
1438 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, m, off);
1440 ifp = m->m_pkthdr.rcvif;
1442 IGMPSTAT_INC(igps_rcv_total);
1444 ip = mtod(m, struct ip *);
1446 igmplen = ip->ip_len;
1451 if (igmplen < IGMP_MINLEN) {
1452 IGMPSTAT_INC(igps_rcv_tooshort);
1458 * Always pullup to the minimum size for v1/v2 or v3
1459 * to amortize calls to m_pullup().
1462 if (igmplen >= IGMP_V3_QUERY_MINLEN)
1463 minlen += IGMP_V3_QUERY_MINLEN;
1465 minlen += IGMP_MINLEN;
1466 if ((m->m_flags & M_EXT || m->m_len < minlen) &&
1467 (m = m_pullup(m, minlen)) == 0) {
1468 IGMPSTAT_INC(igps_rcv_tooshort);
1471 ip = mtod(m, struct ip *);
1473 if (ip->ip_ttl != 1) {
1474 IGMPSTAT_INC(igps_rcv_badttl);
1480 * Validate checksum.
1482 m->m_data += iphlen;
1484 igmp = mtod(m, struct igmp *);
1485 if (in_cksum(m, igmplen)) {
1486 IGMPSTAT_INC(igps_rcv_badsum);
1490 m->m_data -= iphlen;
1493 switch (igmp->igmp_type) {
1494 case IGMP_HOST_MEMBERSHIP_QUERY:
1495 if (igmplen == IGMP_MINLEN) {
1496 if (igmp->igmp_code == 0)
1497 queryver = IGMP_VERSION_1;
1499 queryver = IGMP_VERSION_2;
1500 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) {
1501 queryver = IGMP_VERSION_3;
1503 IGMPSTAT_INC(igps_rcv_tooshort);
1509 case IGMP_VERSION_1:
1510 IGMPSTAT_INC(igps_rcv_v1v2_queries);
1511 if (!V_igmp_v1enable)
1513 if (igmp_input_v1_query(ifp, ip, igmp) != 0) {
1519 case IGMP_VERSION_2:
1520 IGMPSTAT_INC(igps_rcv_v1v2_queries);
1521 if (!V_igmp_v2enable)
1523 if (igmp_input_v2_query(ifp, ip, igmp) != 0) {
1529 case IGMP_VERSION_3: {
1530 struct igmpv3 *igmpv3;
1535 IGMPSTAT_INC(igps_rcv_v3_queries);
1536 igmpv3 = (struct igmpv3 *)igmp;
1538 * Validate length based on source count.
1540 nsrc = ntohs(igmpv3->igmp_numsrc);
1541 srclen = sizeof(struct in_addr) * nsrc;
1542 if (nsrc * sizeof(in_addr_t) > srclen) {
1543 IGMPSTAT_INC(igps_rcv_tooshort);
1547 * m_pullup() may modify m, so pullup in
1550 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN +
1552 if ((m->m_flags & M_EXT ||
1553 m->m_len < igmpv3len) &&
1554 (m = m_pullup(m, igmpv3len)) == NULL) {
1555 IGMPSTAT_INC(igps_rcv_tooshort);
1558 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *)
1560 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) {
1569 case IGMP_v1_HOST_MEMBERSHIP_REPORT:
1570 if (!V_igmp_v1enable)
1572 if (igmp_input_v1_report(ifp, ip, igmp) != 0) {
1578 case IGMP_v2_HOST_MEMBERSHIP_REPORT:
1579 if (!V_igmp_v2enable)
1581 if (!ip_checkrouteralert(m))
1582 IGMPSTAT_INC(igps_rcv_nora);
1583 if (igmp_input_v2_report(ifp, ip, igmp) != 0) {
1589 case IGMP_v3_HOST_MEMBERSHIP_REPORT:
1591 * Hosts do not need to process IGMPv3 membership reports,
1592 * as report suppression is no longer required.
1594 if (!ip_checkrouteralert(m))
1595 IGMPSTAT_INC(igps_rcv_nora);
1603 * Pass all valid IGMP packets up to any process(es) listening on a
1611 * Fast timeout handler (global).
1612 * VIMAGE: Timeout handlers are expected to service all vimages.
1617 VNET_ITERATOR_DECL(vnet_iter);
1619 VNET_LIST_RLOCK_NOSLEEP();
1620 VNET_FOREACH(vnet_iter) {
1621 CURVNET_SET(vnet_iter);
1622 igmp_fasttimo_vnet();
1625 VNET_LIST_RUNLOCK_NOSLEEP();
1629 * Fast timeout handler (per-vnet).
1630 * Sends are shuffled off to a netisr to deal with Giant.
1632 * VIMAGE: Assume caller has set up our curvnet.
1635 igmp_fasttimo_vnet(void)
1637 struct ifqueue scq; /* State-change packets */
1638 struct ifqueue qrq; /* Query response packets */
1640 struct igmp_ifinfo *igi;
1641 struct ifmultiaddr *ifma, *tifma;
1642 struct in_multi *inm;
1643 int loop, uri_fasthz;
1649 * Quick check to see if any work needs to be done, in order to
1650 * minimize the overhead of fasttimo processing.
1651 * SMPng: XXX Unlocked reads.
1653 if (!V_current_state_timers_running &&
1654 !V_interface_timers_running &&
1655 !V_state_change_timers_running)
1662 * IGMPv3 General Query response timer processing.
1664 if (V_interface_timers_running) {
1665 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__);
1667 V_interface_timers_running = 0;
1668 LIST_FOREACH(igi, &V_igi_head, igi_link) {
1669 if (igi->igi_v3_timer == 0) {
1671 } else if (--igi->igi_v3_timer == 0) {
1672 igmp_v3_dispatch_general_query(igi);
1674 V_interface_timers_running = 1;
1679 if (!V_current_state_timers_running &&
1680 !V_state_change_timers_running)
1683 V_current_state_timers_running = 0;
1684 V_state_change_timers_running = 0;
1686 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__);
1689 * IGMPv1/v2/v3 host report and state-change timer processing.
1690 * Note: Processing a v3 group timer may remove a node.
1692 LIST_FOREACH(igi, &V_igi_head, igi_link) {
1695 if (igi->igi_version == IGMP_VERSION_3) {
1696 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0;
1697 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri *
1700 memset(&qrq, 0, sizeof(struct ifqueue));
1701 IFQ_SET_MAXLEN(&qrq, IGMP_MAX_G_GS_PACKETS);
1703 memset(&scq, 0, sizeof(struct ifqueue));
1704 IFQ_SET_MAXLEN(&scq, IGMP_MAX_STATE_CHANGE_PACKETS);
1708 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link,
1710 if (ifma->ifma_addr->sa_family != AF_INET ||
1711 ifma->ifma_protospec == NULL)
1713 inm = (struct in_multi *)ifma->ifma_protospec;
1714 switch (igi->igi_version) {
1715 case IGMP_VERSION_1:
1716 case IGMP_VERSION_2:
1717 igmp_v1v2_process_group_timer(inm,
1720 case IGMP_VERSION_3:
1721 igmp_v3_process_group_timers(igi, &qrq,
1722 &scq, inm, uri_fasthz);
1726 IF_ADDR_UNLOCK(ifp);
1728 if (igi->igi_version == IGMP_VERSION_3) {
1729 struct in_multi *tinm;
1731 igmp_dispatch_queue(&qrq, 0, loop);
1732 igmp_dispatch_queue(&scq, 0, loop);
1735 * Free the in_multi reference(s) for this
1738 SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead,
1740 SLIST_REMOVE_HEAD(&igi->igi_relinmhead,
1742 inm_release_locked(inm);
1753 * Update host report group timer for IGMPv1/v2.
1754 * Will update the global pending timer flags.
1757 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version)
1759 int report_timer_expired;
1761 IN_MULTI_LOCK_ASSERT();
1764 if (inm->inm_timer == 0) {
1765 report_timer_expired = 0;
1766 } else if (--inm->inm_timer == 0) {
1767 report_timer_expired = 1;
1769 V_current_state_timers_running = 1;
1773 switch (inm->inm_state) {
1774 case IGMP_NOT_MEMBER:
1775 case IGMP_SILENT_MEMBER:
1776 case IGMP_IDLE_MEMBER:
1777 case IGMP_LAZY_MEMBER:
1778 case IGMP_SLEEPING_MEMBER:
1779 case IGMP_AWAKENING_MEMBER:
1781 case IGMP_REPORTING_MEMBER:
1782 if (report_timer_expired) {
1783 inm->inm_state = IGMP_IDLE_MEMBER;
1784 (void)igmp_v1v2_queue_report(inm,
1785 (version == IGMP_VERSION_2) ?
1786 IGMP_v2_HOST_MEMBERSHIP_REPORT :
1787 IGMP_v1_HOST_MEMBERSHIP_REPORT);
1790 case IGMP_G_QUERY_PENDING_MEMBER:
1791 case IGMP_SG_QUERY_PENDING_MEMBER:
1792 case IGMP_LEAVING_MEMBER:
1798 * Update a group's timers for IGMPv3.
1799 * Will update the global pending timer flags.
1800 * Note: Unlocked read from igi.
1803 igmp_v3_process_group_timers(struct igmp_ifinfo *igi,
1804 struct ifqueue *qrq, struct ifqueue *scq,
1805 struct in_multi *inm, const int uri_fasthz)
1807 int query_response_timer_expired;
1808 int state_change_retransmit_timer_expired;
1810 IN_MULTI_LOCK_ASSERT();
1813 query_response_timer_expired = 0;
1814 state_change_retransmit_timer_expired = 0;
1817 * During a transition from v1/v2 compatibility mode back to v3,
1818 * a group record in REPORTING state may still have its group
1819 * timer active. This is a no-op in this function; it is easier
1820 * to deal with it here than to complicate the slow-timeout path.
1822 if (inm->inm_timer == 0) {
1823 query_response_timer_expired = 0;
1824 } else if (--inm->inm_timer == 0) {
1825 query_response_timer_expired = 1;
1827 V_current_state_timers_running = 1;
1830 if (inm->inm_sctimer == 0) {
1831 state_change_retransmit_timer_expired = 0;
1832 } else if (--inm->inm_sctimer == 0) {
1833 state_change_retransmit_timer_expired = 1;
1835 V_state_change_timers_running = 1;
1838 /* We are in fasttimo, so be quick about it. */
1839 if (!state_change_retransmit_timer_expired &&
1840 !query_response_timer_expired)
1843 switch (inm->inm_state) {
1844 case IGMP_NOT_MEMBER:
1845 case IGMP_SILENT_MEMBER:
1846 case IGMP_SLEEPING_MEMBER:
1847 case IGMP_LAZY_MEMBER:
1848 case IGMP_AWAKENING_MEMBER:
1849 case IGMP_IDLE_MEMBER:
1851 case IGMP_G_QUERY_PENDING_MEMBER:
1852 case IGMP_SG_QUERY_PENDING_MEMBER:
1854 * Respond to a previously pending Group-Specific
1855 * or Group-and-Source-Specific query by enqueueing
1856 * the appropriate Current-State report for
1857 * immediate transmission.
1859 if (query_response_timer_expired) {
1862 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1,
1863 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER));
1864 CTR2(KTR_IGMPV3, "%s: enqueue record = %d",
1866 inm->inm_state = IGMP_REPORTING_MEMBER;
1867 /* XXX Clear recorded sources for next time. */
1868 inm_clear_recorded(inm);
1871 case IGMP_REPORTING_MEMBER:
1872 case IGMP_LEAVING_MEMBER:
1873 if (state_change_retransmit_timer_expired) {
1875 * State-change retransmission timer fired.
1876 * If there are any further pending retransmissions,
1877 * set the global pending state-change flag, and
1880 if (--inm->inm_scrv > 0) {
1881 inm->inm_sctimer = uri_fasthz;
1882 V_state_change_timers_running = 1;
1885 * Retransmit the previously computed state-change
1886 * report. If there are no further pending
1887 * retransmissions, the mbuf queue will be consumed.
1888 * Update T0 state to T1 as we have now sent
1891 (void)igmp_v3_merge_state_changes(inm, scq);
1894 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
1895 inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
1898 * If we are leaving the group for good, make sure
1899 * we release IGMP's reference to it.
1900 * This release must be deferred using a SLIST,
1901 * as we are called from a loop which traverses
1902 * the in_ifmultiaddr TAILQ.
1904 if (inm->inm_state == IGMP_LEAVING_MEMBER &&
1905 inm->inm_scrv == 0) {
1906 inm->inm_state = IGMP_NOT_MEMBER;
1907 SLIST_INSERT_HEAD(&igi->igi_relinmhead,
1917 * Suppress a group's pending response to a group or source/group query.
1919 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency.
1920 * Do NOT update ST1/ST0 as this operation merely suppresses
1921 * the currently pending group record.
1922 * Do NOT suppress the response to a general query. It is possible but
1923 * it would require adding another state or flag.
1926 igmp_v3_suppress_group_record(struct in_multi *inm)
1929 IN_MULTI_LOCK_ASSERT();
1931 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3,
1932 ("%s: not IGMPv3 mode on link", __func__));
1934 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER ||
1935 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER)
1938 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)
1939 inm_clear_recorded(inm);
1942 inm->inm_state = IGMP_REPORTING_MEMBER;
1946 * Switch to a different IGMP version on the given interface,
1947 * as per Section 7.2.1.
1950 igmp_set_version(struct igmp_ifinfo *igi, const int version)
1952 int old_version_timer;
1956 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__,
1957 version, igi->igi_ifp, igi->igi_ifp->if_xname);
1959 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) {
1961 * Compute the "Older Version Querier Present" timer as per
1964 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri;
1965 old_version_timer *= PR_SLOWHZ;
1967 if (version == IGMP_VERSION_1) {
1968 igi->igi_v1_timer = old_version_timer;
1969 igi->igi_v2_timer = 0;
1970 } else if (version == IGMP_VERSION_2) {
1971 igi->igi_v1_timer = 0;
1972 igi->igi_v2_timer = old_version_timer;
1976 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) {
1977 if (igi->igi_version != IGMP_VERSION_2) {
1978 igi->igi_version = IGMP_VERSION_2;
1979 igmp_v3_cancel_link_timers(igi);
1981 } else if (igi->igi_v1_timer > 0) {
1982 if (igi->igi_version != IGMP_VERSION_1) {
1983 igi->igi_version = IGMP_VERSION_1;
1984 igmp_v3_cancel_link_timers(igi);
1990 * Cancel pending IGMPv3 timers for the given link and all groups
1991 * joined on it; state-change, general-query, and group-query timers.
1993 * Only ever called on a transition from v3 to Compatibility mode. Kill
1994 * the timers stone dead (this may be expensive for large N groups), they
1995 * will be restarted if Compatibility Mode deems that they must be due to
1999 igmp_v3_cancel_link_timers(struct igmp_ifinfo *igi)
2001 struct ifmultiaddr *ifma;
2003 struct in_multi *inm;
2005 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__,
2006 igi->igi_ifp, igi->igi_ifp->if_xname);
2008 IN_MULTI_LOCK_ASSERT();
2012 * Stop the v3 General Query Response on this link stone dead.
2013 * If fasttimo is woken up due to V_interface_timers_running,
2014 * the flag will be cleared if there are no pending link timers.
2016 igi->igi_v3_timer = 0;
2019 * Now clear the current-state and state-change report timers
2020 * for all memberships scoped to this link.
2024 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2025 if (ifma->ifma_addr->sa_family != AF_INET ||
2026 ifma->ifma_protospec == NULL)
2028 inm = (struct in_multi *)ifma->ifma_protospec;
2029 switch (inm->inm_state) {
2030 case IGMP_NOT_MEMBER:
2031 case IGMP_SILENT_MEMBER:
2032 case IGMP_IDLE_MEMBER:
2033 case IGMP_LAZY_MEMBER:
2034 case IGMP_SLEEPING_MEMBER:
2035 case IGMP_AWAKENING_MEMBER:
2037 * These states are either not relevant in v3 mode,
2038 * or are unreported. Do nothing.
2041 case IGMP_LEAVING_MEMBER:
2043 * If we are leaving the group and switching to
2044 * compatibility mode, we need to release the final
2045 * reference held for issuing the INCLUDE {}, and
2046 * transition to REPORTING to ensure the host leave
2047 * message is sent upstream to the old querier --
2048 * transition to NOT would lose the leave and race.
2050 * SMPNG: Must drop and re-acquire IF_ADDR_LOCK
2051 * around inm_release_locked(), as it is not
2052 * a recursive mutex.
2054 IF_ADDR_UNLOCK(ifp);
2055 inm_release_locked(inm);
2058 case IGMP_G_QUERY_PENDING_MEMBER:
2059 case IGMP_SG_QUERY_PENDING_MEMBER:
2060 inm_clear_recorded(inm);
2062 case IGMP_REPORTING_MEMBER:
2063 inm->inm_state = IGMP_REPORTING_MEMBER;
2067 * Always clear state-change and group report timers.
2068 * Free any pending IGMPv3 state-change records.
2070 inm->inm_sctimer = 0;
2072 _IF_DRAIN(&inm->inm_scq);
2074 IF_ADDR_UNLOCK(ifp);
2078 * Update the Older Version Querier Present timers for a link.
2079 * See Section 7.2.1 of RFC 3376.
2082 igmp_v1v2_process_querier_timers(struct igmp_ifinfo *igi)
2087 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) {
2089 * IGMPv1 and IGMPv2 Querier Present timers expired.
2093 if (igi->igi_version != IGMP_VERSION_3) {
2095 "%s: transition from v%d -> v%d on %p(%s)",
2096 __func__, igi->igi_version, IGMP_VERSION_3,
2097 igi->igi_ifp, igi->igi_ifp->if_xname);
2098 igi->igi_version = IGMP_VERSION_3;
2100 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) {
2102 * IGMPv1 Querier Present timer expired,
2103 * IGMPv2 Querier Present timer running.
2104 * If IGMPv2 was disabled since last timeout,
2106 * If IGMPv2 is enabled, revert to IGMPv2.
2108 if (!V_igmp_v2enable) {
2110 "%s: transition from v%d -> v%d on %p(%s)",
2111 __func__, igi->igi_version, IGMP_VERSION_3,
2112 igi->igi_ifp, igi->igi_ifp->if_xname);
2113 igi->igi_v2_timer = 0;
2114 igi->igi_version = IGMP_VERSION_3;
2116 --igi->igi_v2_timer;
2117 if (igi->igi_version != IGMP_VERSION_2) {
2119 "%s: transition from v%d -> v%d on %p(%s)",
2120 __func__, igi->igi_version, IGMP_VERSION_2,
2121 igi->igi_ifp, igi->igi_ifp->if_xname);
2122 igi->igi_version = IGMP_VERSION_2;
2125 } else if (igi->igi_v1_timer > 0) {
2127 * IGMPv1 Querier Present timer running.
2128 * Stop IGMPv2 timer if running.
2130 * If IGMPv1 was disabled since last timeout,
2132 * If IGMPv1 is enabled, reset IGMPv2 timer if running.
2134 if (!V_igmp_v1enable) {
2136 "%s: transition from v%d -> v%d on %p(%s)",
2137 __func__, igi->igi_version, IGMP_VERSION_3,
2138 igi->igi_ifp, igi->igi_ifp->if_xname);
2139 igi->igi_v1_timer = 0;
2140 igi->igi_version = IGMP_VERSION_3;
2142 --igi->igi_v1_timer;
2144 if (igi->igi_v2_timer > 0) {
2146 "%s: cancel v2 timer on %p(%s)",
2147 __func__, igi->igi_ifp, igi->igi_ifp->if_xname);
2148 igi->igi_v2_timer = 0;
2154 * Global slowtimo handler.
2155 * VIMAGE: Timeout handlers are expected to service all vimages.
2160 VNET_ITERATOR_DECL(vnet_iter);
2162 VNET_LIST_RLOCK_NOSLEEP();
2163 VNET_FOREACH(vnet_iter) {
2164 CURVNET_SET(vnet_iter);
2165 igmp_slowtimo_vnet();
2168 VNET_LIST_RUNLOCK_NOSLEEP();
2172 * Per-vnet slowtimo handler.
2175 igmp_slowtimo_vnet(void)
2177 struct igmp_ifinfo *igi;
2181 LIST_FOREACH(igi, &V_igi_head, igi_link) {
2182 igmp_v1v2_process_querier_timers(igi);
2189 * Dispatch an IGMPv1/v2 host report or leave message.
2190 * These are always small enough to fit inside a single mbuf.
2193 igmp_v1v2_queue_report(struct in_multi *inm, const int type)
2200 IN_MULTI_LOCK_ASSERT();
2205 MGETHDR(m, M_DONTWAIT, MT_DATA);
2208 MH_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp));
2210 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp);
2212 m->m_data += sizeof(struct ip);
2213 m->m_len = sizeof(struct igmp);
2215 igmp = mtod(m, struct igmp *);
2216 igmp->igmp_type = type;
2217 igmp->igmp_code = 0;
2218 igmp->igmp_group = inm->inm_addr;
2219 igmp->igmp_cksum = 0;
2220 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp));
2222 m->m_data -= sizeof(struct ip);
2223 m->m_len += sizeof(struct ip);
2225 ip = mtod(m, struct ip *);
2227 ip->ip_len = sizeof(struct ip) + sizeof(struct igmp);
2229 ip->ip_p = IPPROTO_IGMP;
2230 ip->ip_src.s_addr = INADDR_ANY;
2232 if (type == IGMP_HOST_LEAVE_MESSAGE)
2233 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP);
2235 ip->ip_dst = inm->inm_addr;
2237 igmp_save_context(m, ifp);
2239 m->m_flags |= M_IGMPV2;
2240 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK)
2241 m->m_flags |= M_IGMP_LOOP;
2243 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m);
2244 netisr_dispatch(NETISR_IGMP, m);
2250 * Process a state change from the upper layer for the given IPv4 group.
2252 * Each socket holds a reference on the in_multi in its own ip_moptions.
2253 * The socket layer will have made the necessary updates to.the group
2254 * state, it is now up to IGMP to issue a state change report if there
2255 * has been any change between T0 (when the last state-change was issued)
2258 * We use the IGMPv3 state machine at group level. The IGMP module
2259 * however makes the decision as to which IGMP protocol version to speak.
2260 * A state change *from* INCLUDE {} always means an initial join.
2261 * A state change *to* INCLUDE {} always means a final leave.
2263 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can
2264 * save ourselves a bunch of work; any exclusive mode groups need not
2265 * compute source filter lists.
2267 * VIMAGE: curvnet should have been set by caller, as this routine
2268 * is called from the socket option handlers.
2271 igmp_change_state(struct in_multi *inm)
2273 struct igmp_ifinfo *igi;
2277 IN_MULTI_LOCK_ASSERT();
2282 * Try to detect if the upper layer just asked us to change state
2283 * for an interface which has now gone away.
2285 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__));
2286 ifp = inm->inm_ifma->ifma_ifp;
2289 * Sanity check that netinet's notion of ifp is the
2292 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__));
2297 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp;
2298 KASSERT(igi != NULL, ("%s: no igmp_ifinfo for ifp %p", __func__, ifp));
2301 * If we detect a state transition to or from MCAST_UNDEFINED
2302 * for this group, then we are starting or finishing an IGMP
2303 * life cycle for this group.
2305 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) {
2306 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__,
2307 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode);
2308 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) {
2309 CTR1(KTR_IGMPV3, "%s: initial join", __func__);
2310 error = igmp_initial_join(inm, igi);
2312 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) {
2313 CTR1(KTR_IGMPV3, "%s: final leave", __func__);
2314 igmp_final_leave(inm, igi);
2318 CTR1(KTR_IGMPV3, "%s: filter set change", __func__);
2321 error = igmp_handle_state_change(inm, igi);
2329 * Perform the initial join for an IGMP group.
2331 * When joining a group:
2332 * If the group should have its IGMP traffic suppressed, do nothing.
2333 * IGMPv1 starts sending IGMPv1 host membership reports.
2334 * IGMPv2 starts sending IGMPv2 host membership reports.
2335 * IGMPv3 will schedule an IGMPv3 state-change report containing the
2336 * initial state of the membership.
2339 igmp_initial_join(struct in_multi *inm, struct igmp_ifinfo *igi)
2342 struct ifqueue *ifq;
2343 int error, retval, syncstates;
2345 CTR4(KTR_IGMPV3, "%s: initial join %s on ifp %p(%s)",
2346 __func__, inet_ntoa(inm->inm_addr), inm->inm_ifp,
2347 inm->inm_ifp->if_xname);
2354 IN_MULTI_LOCK_ASSERT();
2357 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__));
2360 * Groups joined on loopback or marked as 'not reported',
2361 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and
2362 * are never reported in any IGMP protocol exchanges.
2363 * All other groups enter the appropriate IGMP state machine
2364 * for the version in use on this link.
2365 * A link marked as IGIF_SILENT causes IGMP to be completely
2366 * disabled for the link.
2368 if ((ifp->if_flags & IFF_LOOPBACK) ||
2369 (igi->igi_flags & IGIF_SILENT) ||
2370 !igmp_isgroupreported(inm->inm_addr)) {
2372 "%s: not kicking state machine for silent group", __func__);
2373 inm->inm_state = IGMP_SILENT_MEMBER;
2377 * Deal with overlapping in_multi lifecycle.
2378 * If this group was LEAVING, then make sure
2379 * we drop the reference we picked up to keep the
2380 * group around for the final INCLUDE {} enqueue.
2382 if (igi->igi_version == IGMP_VERSION_3 &&
2383 inm->inm_state == IGMP_LEAVING_MEMBER)
2384 inm_release_locked(inm);
2386 inm->inm_state = IGMP_REPORTING_MEMBER;
2388 switch (igi->igi_version) {
2389 case IGMP_VERSION_1:
2390 case IGMP_VERSION_2:
2391 inm->inm_state = IGMP_IDLE_MEMBER;
2392 error = igmp_v1v2_queue_report(inm,
2393 (igi->igi_version == IGMP_VERSION_2) ?
2394 IGMP_v2_HOST_MEMBERSHIP_REPORT :
2395 IGMP_v1_HOST_MEMBERSHIP_REPORT);
2397 inm->inm_timer = IGMP_RANDOM_DELAY(
2398 IGMP_V1V2_MAX_RI * PR_FASTHZ);
2399 V_current_state_timers_running = 1;
2403 case IGMP_VERSION_3:
2405 * Defer update of T0 to T1, until the first copy
2406 * of the state change has been transmitted.
2411 * Immediately enqueue a State-Change Report for
2412 * this interface, freeing any previous reports.
2413 * Don't kick the timers if there is nothing to do,
2414 * or if an error occurred.
2416 ifq = &inm->inm_scq;
2418 retval = igmp_v3_enqueue_group_record(ifq, inm, 1,
2420 CTR2(KTR_IGMPV3, "%s: enqueue record = %d",
2423 error = retval * -1;
2428 * Schedule transmission of pending state-change
2429 * report up to RV times for this link. The timer
2430 * will fire at the next igmp_fasttimo (~200ms),
2431 * giving us an opportunity to merge the reports.
2433 if (igi->igi_flags & IGIF_LOOPBACK) {
2436 KASSERT(igi->igi_rv > 1,
2437 ("%s: invalid robustness %d", __func__,
2439 inm->inm_scrv = igi->igi_rv;
2441 inm->inm_sctimer = 1;
2442 V_state_change_timers_running = 1;
2450 * Only update the T0 state if state change is atomic,
2451 * i.e. we don't need to wait for a timer to fire before we
2452 * can consider the state change to have been communicated.
2456 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
2457 inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
2464 * Issue an intermediate state change during the IGMP life-cycle.
2467 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifinfo *igi)
2472 CTR4(KTR_IGMPV3, "%s: state change for %s on ifp %p(%s)",
2473 __func__, inet_ntoa(inm->inm_addr), inm->inm_ifp,
2474 inm->inm_ifp->if_xname);
2478 IN_MULTI_LOCK_ASSERT();
2481 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__));
2483 if ((ifp->if_flags & IFF_LOOPBACK) ||
2484 (igi->igi_flags & IGIF_SILENT) ||
2485 !igmp_isgroupreported(inm->inm_addr) ||
2486 (igi->igi_version != IGMP_VERSION_3)) {
2487 if (!igmp_isgroupreported(inm->inm_addr)) {
2489 "%s: not kicking state machine for silent group", __func__);
2491 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__);
2493 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
2494 inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
2498 _IF_DRAIN(&inm->inm_scq);
2500 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0);
2501 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval);
2506 * If record(s) were enqueued, start the state-change
2507 * report timer for this group.
2509 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv);
2510 inm->inm_sctimer = 1;
2511 V_state_change_timers_running = 1;
2517 * Perform the final leave for an IGMP group.
2519 * When leaving a group:
2520 * IGMPv1 does nothing.
2521 * IGMPv2 sends a host leave message, if and only if we are the reporter.
2522 * IGMPv3 enqueues a state-change report containing a transition
2523 * to INCLUDE {} for immediate transmission.
2526 igmp_final_leave(struct in_multi *inm, struct igmp_ifinfo *igi)
2532 CTR4(KTR_IGMPV3, "%s: final leave %s on ifp %p(%s)",
2533 __func__, inet_ntoa(inm->inm_addr), inm->inm_ifp,
2534 inm->inm_ifp->if_xname);
2536 IN_MULTI_LOCK_ASSERT();
2539 switch (inm->inm_state) {
2540 case IGMP_NOT_MEMBER:
2541 case IGMP_SILENT_MEMBER:
2542 case IGMP_LEAVING_MEMBER:
2543 /* Already leaving or left; do nothing. */
2545 "%s: not kicking state machine for silent group", __func__);
2547 case IGMP_REPORTING_MEMBER:
2548 case IGMP_IDLE_MEMBER:
2549 case IGMP_G_QUERY_PENDING_MEMBER:
2550 case IGMP_SG_QUERY_PENDING_MEMBER:
2551 if (igi->igi_version == IGMP_VERSION_2) {
2553 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER ||
2554 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)
2555 panic("%s: IGMPv3 state reached, not IGMPv3 mode",
2558 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE);
2559 inm->inm_state = IGMP_NOT_MEMBER;
2560 } else if (igi->igi_version == IGMP_VERSION_3) {
2562 * Stop group timer and all pending reports.
2563 * Immediately enqueue a state-change report
2564 * TO_IN {} to be sent on the next fast timeout,
2565 * giving us an opportunity to merge reports.
2567 _IF_DRAIN(&inm->inm_scq);
2569 if (igi->igi_flags & IGIF_LOOPBACK) {
2572 inm->inm_scrv = igi->igi_rv;
2574 CTR4(KTR_IGMPV3, "%s: Leaving %s/%s with %d "
2575 "pending retransmissions.", __func__,
2576 inet_ntoa(inm->inm_addr),
2577 inm->inm_ifp->if_xname, inm->inm_scrv);
2578 if (inm->inm_scrv == 0) {
2579 inm->inm_state = IGMP_NOT_MEMBER;
2580 inm->inm_sctimer = 0;
2584 inm_acquire_locked(inm);
2586 retval = igmp_v3_enqueue_group_record(
2587 &inm->inm_scq, inm, 1, 0, 0);
2588 KASSERT(retval != 0,
2589 ("%s: enqueue record = %d", __func__,
2592 inm->inm_state = IGMP_LEAVING_MEMBER;
2593 inm->inm_sctimer = 1;
2594 V_state_change_timers_running = 1;
2600 case IGMP_LAZY_MEMBER:
2601 case IGMP_SLEEPING_MEMBER:
2602 case IGMP_AWAKENING_MEMBER:
2603 /* Our reports are suppressed; do nothing. */
2609 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__,
2610 inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
2611 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED;
2612 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for %s/%s",
2613 __func__, inet_ntoa(inm->inm_addr), inm->inm_ifp->if_xname);
2618 * Enqueue an IGMPv3 group record to the given output queue.
2620 * XXX This function could do with having the allocation code
2621 * split out, and the multiple-tree-walks coalesced into a single
2622 * routine as has been done in igmp_v3_enqueue_filter_change().
2624 * If is_state_change is zero, a current-state record is appended.
2625 * If is_state_change is non-zero, a state-change report is appended.
2627 * If is_group_query is non-zero, an mbuf packet chain is allocated.
2628 * If is_group_query is zero, and if there is a packet with free space
2629 * at the tail of the queue, it will be appended to providing there
2630 * is enough free space.
2631 * Otherwise a new mbuf packet chain is allocated.
2633 * If is_source_query is non-zero, each source is checked to see if
2634 * it was recorded for a Group-Source query, and will be omitted if
2635 * it is not both in-mode and recorded.
2637 * The function will attempt to allocate leading space in the packet
2638 * for the IP/IGMP header to be prepended without fragmenting the chain.
2640 * If successful the size of all data appended to the queue is returned,
2641 * otherwise an error code less than zero is returned, or zero if
2642 * no record(s) were appended.
2645 igmp_v3_enqueue_group_record(struct ifqueue *ifq, struct in_multi *inm,
2646 const int is_state_change, const int is_group_query,
2647 const int is_source_query)
2649 struct igmp_grouprec ig;
2650 struct igmp_grouprec *pig;
2652 struct ip_msource *ims, *nims;
2653 struct mbuf *m0, *m, *md;
2654 int error, is_filter_list_change;
2655 int minrec0len, m0srcs, msrcs, nbytes, off;
2656 int record_has_sources;
2662 IN_MULTI_LOCK_ASSERT();
2666 is_filter_list_change = 0;
2673 record_has_sources = 1;
2675 type = IGMP_DO_NOTHING;
2676 mode = inm->inm_st[1].iss_fmode;
2679 * If we did not transition out of ASM mode during t0->t1,
2680 * and there are no source nodes to process, we can skip
2681 * the generation of source records.
2683 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 &&
2685 record_has_sources = 0;
2687 if (is_state_change) {
2689 * Queue a state change record.
2690 * If the mode did not change, and there are non-ASM
2691 * listeners or source filters present,
2692 * we potentially need to issue two records for the group.
2693 * If we are transitioning to MCAST_UNDEFINED, we need
2694 * not send any sources.
2695 * If there are ASM listeners, and there was no filter
2696 * mode transition of any kind, do nothing.
2698 if (mode != inm->inm_st[0].iss_fmode) {
2699 if (mode == MCAST_EXCLUDE) {
2700 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE",
2702 type = IGMP_CHANGE_TO_EXCLUDE_MODE;
2704 CTR1(KTR_IGMPV3, "%s: change to INCLUDE",
2706 type = IGMP_CHANGE_TO_INCLUDE_MODE;
2707 if (mode == MCAST_UNDEFINED)
2708 record_has_sources = 0;
2711 if (record_has_sources) {
2712 is_filter_list_change = 1;
2714 type = IGMP_DO_NOTHING;
2719 * Queue a current state record.
2721 if (mode == MCAST_EXCLUDE) {
2722 type = IGMP_MODE_IS_EXCLUDE;
2723 } else if (mode == MCAST_INCLUDE) {
2724 type = IGMP_MODE_IS_INCLUDE;
2725 KASSERT(inm->inm_st[1].iss_asm == 0,
2726 ("%s: inm %p is INCLUDE but ASM count is %d",
2727 __func__, inm, inm->inm_st[1].iss_asm));
2732 * Generate the filter list changes using a separate function.
2734 if (is_filter_list_change)
2735 return (igmp_v3_enqueue_filter_change(ifq, inm));
2737 if (type == IGMP_DO_NOTHING) {
2738 CTR3(KTR_IGMPV3, "%s: nothing to do for %s/%s",
2739 __func__, inet_ntoa(inm->inm_addr),
2740 inm->inm_ifp->if_xname);
2745 * If any sources are present, we must be able to fit at least
2746 * one in the trailing space of the tail packet's mbuf,
2749 minrec0len = sizeof(struct igmp_grouprec);
2750 if (record_has_sources)
2751 minrec0len += sizeof(in_addr_t);
2753 CTR4(KTR_IGMPV3, "%s: queueing %s for %s/%s", __func__,
2754 igmp_rec_type_to_str(type), inet_ntoa(inm->inm_addr),
2755 inm->inm_ifp->if_xname);
2758 * Check if we have a packet in the tail of the queue for this
2759 * group into which the first group record for this group will fit.
2760 * Otherwise allocate a new packet.
2761 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT.
2762 * Note: Group records for G/GSR query responses MUST be sent
2763 * in their own packet.
2766 if (!is_group_query &&
2768 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) &&
2769 (m0->m_pkthdr.len + minrec0len) <
2770 (ifp->if_mtu - IGMP_LEADINGSPACE)) {
2771 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
2772 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
2774 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__);
2776 if (_IF_QFULL(ifq)) {
2777 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__);
2781 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
2782 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
2783 if (!is_state_change && !is_group_query) {
2784 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
2786 m->m_data += IGMP_LEADINGSPACE;
2789 m = m_gethdr(M_DONTWAIT, MT_DATA);
2791 MH_ALIGN(m, IGMP_LEADINGSPACE);
2796 igmp_save_context(m, ifp);
2798 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__);
2802 * Append group record.
2803 * If we have sources, we don't know how many yet.
2808 ig.ig_group = inm->inm_addr;
2809 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) {
2812 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__);
2815 nbytes += sizeof(struct igmp_grouprec);
2818 * Append as many sources as will fit in the first packet.
2819 * If we are appending to a new packet, the chain allocation
2820 * may potentially use clusters; use m_getptr() in this case.
2821 * If we are appending to an existing packet, we need to obtain
2822 * a pointer to the group record after m_append(), in case a new
2823 * mbuf was allocated.
2824 * Only append sources which are in-mode at t1. If we are
2825 * transitioning to MCAST_UNDEFINED state on the group, do not
2826 * include source entries.
2827 * Only report recorded sources in our filter set when responding
2828 * to a group-source query.
2830 if (record_has_sources) {
2833 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) +
2834 md->m_len - nbytes);
2836 md = m_getptr(m, 0, &off);
2837 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) +
2841 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) {
2842 CTR2(KTR_IGMPV3, "%s: visit node %s", __func__,
2843 inet_ntoa_haddr(ims->ims_haddr));
2844 now = ims_get_mode(inm, ims, 1);
2845 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now);
2846 if ((now != mode) ||
2847 (now == mode && mode == MCAST_UNDEFINED)) {
2848 CTR1(KTR_IGMPV3, "%s: skip node", __func__);
2851 if (is_source_query && ims->ims_stp == 0) {
2852 CTR1(KTR_IGMPV3, "%s: skip unrecorded node",
2856 CTR1(KTR_IGMPV3, "%s: append node", __func__);
2857 naddr = htonl(ims->ims_haddr);
2858 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) {
2861 CTR1(KTR_IGMPV3, "%s: m_append() failed.",
2865 nbytes += sizeof(in_addr_t);
2867 if (msrcs == m0srcs)
2870 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__,
2872 pig->ig_numsrc = htons(msrcs);
2873 nbytes += (msrcs * sizeof(in_addr_t));
2876 if (is_source_query && msrcs == 0) {
2877 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__);
2884 * We are good to go with first packet.
2887 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__);
2888 m->m_pkthdr.PH_vt.vt_nrecs = 1;
2889 _IF_ENQUEUE(ifq, m);
2891 m->m_pkthdr.PH_vt.vt_nrecs++;
2894 * No further work needed if no source list in packet(s).
2896 if (!record_has_sources)
2900 * Whilst sources remain to be announced, we need to allocate
2901 * a new packet and fill out as many sources as will fit.
2902 * Always try for a cluster first.
2904 while (nims != NULL) {
2905 if (_IF_QFULL(ifq)) {
2906 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__);
2909 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
2911 m->m_data += IGMP_LEADINGSPACE;
2913 m = m_gethdr(M_DONTWAIT, MT_DATA);
2915 MH_ALIGN(m, IGMP_LEADINGSPACE);
2919 igmp_save_context(m, ifp);
2920 md = m_getptr(m, 0, &off);
2921 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off);
2922 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__);
2924 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) {
2927 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__);
2930 m->m_pkthdr.PH_vt.vt_nrecs = 1;
2931 nbytes += sizeof(struct igmp_grouprec);
2933 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
2934 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t);
2937 RB_FOREACH_FROM(ims, ip_msource_tree, nims) {
2938 CTR2(KTR_IGMPV3, "%s: visit node %s", __func__,
2939 inet_ntoa_haddr(ims->ims_haddr));
2940 now = ims_get_mode(inm, ims, 1);
2941 if ((now != mode) ||
2942 (now == mode && mode == MCAST_UNDEFINED)) {
2943 CTR1(KTR_IGMPV3, "%s: skip node", __func__);
2946 if (is_source_query && ims->ims_stp == 0) {
2947 CTR1(KTR_IGMPV3, "%s: skip unrecorded node",
2951 CTR1(KTR_IGMPV3, "%s: append node", __func__);
2952 naddr = htonl(ims->ims_haddr);
2953 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) {
2956 CTR1(KTR_IGMPV3, "%s: m_append() failed.",
2961 if (msrcs == m0srcs)
2964 pig->ig_numsrc = htons(msrcs);
2965 nbytes += (msrcs * sizeof(in_addr_t));
2967 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__);
2968 _IF_ENQUEUE(ifq, m);
2975 * Type used to mark record pass completion.
2976 * We exploit the fact we can cast to this easily from the
2977 * current filter modes on each ip_msource node.
2980 REC_NONE = 0x00, /* MCAST_UNDEFINED */
2981 REC_ALLOW = 0x01, /* MCAST_INCLUDE */
2982 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */
2983 REC_FULL = REC_ALLOW | REC_BLOCK
2987 * Enqueue an IGMPv3 filter list change to the given output queue.
2989 * Source list filter state is held in an RB-tree. When the filter list
2990 * for a group is changed without changing its mode, we need to compute
2991 * the deltas between T0 and T1 for each source in the filter set,
2992 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records.
2994 * As we may potentially queue two record types, and the entire R-B tree
2995 * needs to be walked at once, we break this out into its own function
2996 * so we can generate a tightly packed queue of packets.
2998 * XXX This could be written to only use one tree walk, although that makes
2999 * serializing into the mbuf chains a bit harder. For now we do two walks
3000 * which makes things easier on us, and it may or may not be harder on
3003 * If successful the size of all data appended to the queue is returned,
3004 * otherwise an error code less than zero is returned, or zero if
3005 * no record(s) were appended.
3008 igmp_v3_enqueue_filter_change(struct ifqueue *ifq, struct in_multi *inm)
3010 static const int MINRECLEN =
3011 sizeof(struct igmp_grouprec) + sizeof(in_addr_t);
3013 struct igmp_grouprec ig;
3014 struct igmp_grouprec *pig;
3015 struct ip_msource *ims, *nims;
3016 struct mbuf *m, *m0, *md;
3018 int m0srcs, nbytes, npbytes, off, rsrcs, schanged;
3020 uint8_t mode, now, then;
3021 rectype_t crt, drt, nrt;
3023 IN_MULTI_LOCK_ASSERT();
3025 if (inm->inm_nsrc == 0 ||
3026 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0))
3029 ifp = inm->inm_ifp; /* interface */
3030 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */
3031 crt = REC_NONE; /* current group record type */
3032 drt = REC_NONE; /* mask of completed group record types */
3033 nrt = REC_NONE; /* record type for current node */
3034 m0srcs = 0; /* # source which will fit in current mbuf chain */
3035 nbytes = 0; /* # of bytes appended to group's state-change queue */
3036 npbytes = 0; /* # of bytes appended this packet */
3037 rsrcs = 0; /* # sources encoded in current record */
3038 schanged = 0; /* # nodes encoded in overall filter change */
3039 nallow = 0; /* # of source entries in ALLOW_NEW */
3040 nblock = 0; /* # of source entries in BLOCK_OLD */
3041 nims = NULL; /* next tree node pointer */
3044 * For each possible filter record mode.
3045 * The first kind of source we encounter tells us which
3046 * is the first kind of record we start appending.
3047 * If a node transitioned to UNDEFINED at t1, its mode is treated
3048 * as the inverse of the group's filter mode.
3050 while (drt != REC_FULL) {
3054 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <=
3055 IGMP_V3_REPORT_MAXRECS) &&
3056 (m0->m_pkthdr.len + MINRECLEN) <
3057 (ifp->if_mtu - IGMP_LEADINGSPACE)) {
3059 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
3060 sizeof(struct igmp_grouprec)) /
3063 "%s: use previous packet", __func__);
3065 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
3067 m->m_data += IGMP_LEADINGSPACE;
3069 m = m_gethdr(M_DONTWAIT, MT_DATA);
3071 MH_ALIGN(m, IGMP_LEADINGSPACE);
3075 "%s: m_get*() failed", __func__);
3078 m->m_pkthdr.PH_vt.vt_nrecs = 0;
3079 igmp_save_context(m, ifp);
3080 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE -
3081 sizeof(struct igmp_grouprec)) /
3085 "%s: allocated new packet", __func__);
3088 * Append the IGMP group record header to the
3089 * current packet's data area.
3090 * Recalculate pointer to free space for next
3091 * group record, in case m_append() allocated
3092 * a new mbuf or cluster.
3094 memset(&ig, 0, sizeof(ig));
3095 ig.ig_group = inm->inm_addr;
3096 if (!m_append(m, sizeof(ig), (void *)&ig)) {
3100 "%s: m_append() failed", __func__);
3103 npbytes += sizeof(struct igmp_grouprec);
3105 /* new packet; offset in c hain */
3106 md = m_getptr(m, npbytes -
3107 sizeof(struct igmp_grouprec), &off);
3108 pig = (struct igmp_grouprec *)(mtod(md,
3111 /* current packet; offset from last append */
3113 pig = (struct igmp_grouprec *)(mtod(md,
3114 uint8_t *) + md->m_len -
3115 sizeof(struct igmp_grouprec));
3118 * Begin walking the tree for this record type
3119 * pass, or continue from where we left off
3120 * previously if we had to allocate a new packet.
3121 * Only report deltas in-mode at t1.
3122 * We need not report included sources as allowed
3123 * if we are in inclusive mode on the group,
3124 * however the converse is not true.
3128 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs);
3129 RB_FOREACH_FROM(ims, ip_msource_tree, nims) {
3130 CTR2(KTR_IGMPV3, "%s: visit node %s",
3131 __func__, inet_ntoa_haddr(ims->ims_haddr));
3132 now = ims_get_mode(inm, ims, 1);
3133 then = ims_get_mode(inm, ims, 0);
3134 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d",
3135 __func__, then, now);
3138 "%s: skip unchanged", __func__);
3141 if (mode == MCAST_EXCLUDE &&
3142 now == MCAST_INCLUDE) {
3144 "%s: skip IN src on EX group",
3148 nrt = (rectype_t)now;
3149 if (nrt == REC_NONE)
3150 nrt = (rectype_t)(~mode & REC_FULL);
3151 if (schanged++ == 0) {
3153 } else if (crt != nrt)
3155 naddr = htonl(ims->ims_haddr);
3156 if (!m_append(m, sizeof(in_addr_t),
3161 "%s: m_append() failed", __func__);
3164 nallow += !!(crt == REC_ALLOW);
3165 nblock += !!(crt == REC_BLOCK);
3166 if (++rsrcs == m0srcs)
3170 * If we did not append any tree nodes on this
3171 * pass, back out of allocations.
3174 npbytes -= sizeof(struct igmp_grouprec);
3177 "%s: m_free(m)", __func__);
3181 "%s: m_adj(m, -ig)", __func__);
3182 m_adj(m, -((int)sizeof(
3183 struct igmp_grouprec)));
3187 npbytes += (rsrcs * sizeof(in_addr_t));
3188 if (crt == REC_ALLOW)
3189 pig->ig_type = IGMP_ALLOW_NEW_SOURCES;
3190 else if (crt == REC_BLOCK)
3191 pig->ig_type = IGMP_BLOCK_OLD_SOURCES;
3192 pig->ig_numsrc = htons(rsrcs);
3194 * Count the new group record, and enqueue this
3195 * packet if it wasn't already queued.
3197 m->m_pkthdr.PH_vt.vt_nrecs++;
3199 _IF_ENQUEUE(ifq, m);
3201 } while (nims != NULL);
3203 crt = (~crt & REC_FULL);
3206 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__,
3213 igmp_v3_merge_state_changes(struct in_multi *inm, struct ifqueue *ifscq)
3216 struct mbuf *m; /* pending state-change */
3217 struct mbuf *m0; /* copy of pending state-change */
3218 struct mbuf *mt; /* last state-change in packet */
3219 int docopy, domerge;
3226 IN_MULTI_LOCK_ASSERT();
3230 * If there are further pending retransmissions, make a writable
3231 * copy of each queued state-change message before merging.
3233 if (inm->inm_scrv > 0)
3238 if (gq->ifq_head == NULL) {
3239 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty",
3247 * Only merge the report into the current packet if
3248 * there is sufficient space to do so; an IGMPv3 report
3249 * packet may only contain 65,535 group records.
3250 * Always use a simple mbuf chain concatentation to do this,
3251 * as large state changes for single groups may have
3252 * allocated clusters.
3255 mt = ifscq->ifq_tail;
3257 recslen = m_length(m, NULL);
3259 if ((mt->m_pkthdr.PH_vt.vt_nrecs +
3260 m->m_pkthdr.PH_vt.vt_nrecs <=
3261 IGMP_V3_REPORT_MAXRECS) &&
3262 (mt->m_pkthdr.len + recslen <=
3263 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE)))
3267 if (!domerge && _IF_QFULL(gq)) {
3269 "%s: outbound queue full, skipping whole packet %p",
3279 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m);
3280 _IF_DEQUEUE(gq, m0);
3283 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m);
3284 m0 = m_dup(m, M_NOWAIT);
3287 m0->m_nextpkt = NULL;
3292 CTR3(KTR_IGMPV3, "%s: queueing %p to ifscq %p)",
3293 __func__, m0, ifscq);
3294 _IF_ENQUEUE(ifscq, m0);
3296 struct mbuf *mtl; /* last mbuf of packet mt */
3298 CTR3(KTR_IGMPV3, "%s: merging %p with ifscq tail %p)",
3302 m0->m_flags &= ~M_PKTHDR;
3303 mt->m_pkthdr.len += recslen;
3304 mt->m_pkthdr.PH_vt.vt_nrecs +=
3305 m0->m_pkthdr.PH_vt.vt_nrecs;
3315 * Respond to a pending IGMPv3 General Query.
3318 igmp_v3_dispatch_general_query(struct igmp_ifinfo *igi)
3320 struct ifmultiaddr *ifma, *tifma;
3322 struct in_multi *inm;
3325 IN_MULTI_LOCK_ASSERT();
3328 KASSERT(igi->igi_version == IGMP_VERSION_3,
3329 ("%s: called when version %d", __func__, igi->igi_version));
3334 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, tifma) {
3335 if (ifma->ifma_addr->sa_family != AF_INET ||
3336 ifma->ifma_protospec == NULL)
3339 inm = (struct in_multi *)ifma->ifma_protospec;
3340 KASSERT(ifp == inm->inm_ifp,
3341 ("%s: inconsistent ifp", __func__));
3343 switch (inm->inm_state) {
3344 case IGMP_NOT_MEMBER:
3345 case IGMP_SILENT_MEMBER:
3347 case IGMP_REPORTING_MEMBER:
3348 case IGMP_IDLE_MEMBER:
3349 case IGMP_LAZY_MEMBER:
3350 case IGMP_SLEEPING_MEMBER:
3351 case IGMP_AWAKENING_MEMBER:
3352 inm->inm_state = IGMP_REPORTING_MEMBER;
3353 retval = igmp_v3_enqueue_group_record(&igi->igi_gq,
3355 CTR2(KTR_IGMPV3, "%s: enqueue record = %d",
3358 case IGMP_G_QUERY_PENDING_MEMBER:
3359 case IGMP_SG_QUERY_PENDING_MEMBER:
3360 case IGMP_LEAVING_MEMBER:
3364 IF_ADDR_UNLOCK(ifp);
3366 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0;
3367 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop);
3370 * Slew transmission of bursts over 500ms intervals.
3372 if (igi->igi_gq.ifq_head != NULL) {
3373 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY(
3374 IGMP_RESPONSE_BURST_INTERVAL);
3375 V_interface_timers_running = 1;
3380 * Transmit the next pending IGMP message in the output queue.
3382 * We get called from netisr_processqueue(). A mutex private to igmpoq
3383 * will be acquired and released around this routine.
3385 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis.
3386 * MRT: Nothing needs to be done, as IGMP traffic is always local to
3387 * a link and uses a link-scope multicast address.
3390 igmp_intr(struct mbuf *m)
3392 struct ip_moptions imo;
3394 struct mbuf *ipopts, *m0;
3398 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m);
3401 * Set VNET image pointer from enqueued mbuf chain
3402 * before doing anything else. Whilst we use interface
3403 * indexes to guard against interface detach, they are
3404 * unique to each VIMAGE and must be retrieved.
3406 CURVNET_SET((struct vnet *)(m->m_pkthdr.header));
3407 ifindex = igmp_restore_context(m);
3410 * Check if the ifnet still exists. This limits the scope of
3411 * any race in the absence of a global ifp lock for low cost
3412 * (an array lookup).
3414 ifp = ifnet_byindex(ifindex);
3416 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.",
3417 __func__, m, ifindex);
3419 IPSTAT_INC(ips_noroute);
3423 ipopts = V_igmp_sendra ? m_raopt : NULL;
3425 imo.imo_multicast_ttl = 1;
3426 imo.imo_multicast_vif = -1;
3427 imo.imo_multicast_loop = (V_ip_mrouter != NULL);
3430 * If the user requested that IGMP traffic be explicitly
3431 * redirected to the loopback interface (e.g. they are running a
3432 * MANET interface and the routing protocol needs to see the
3433 * updates), handle this now.
3435 if (m->m_flags & M_IGMP_LOOP)
3436 imo.imo_multicast_ifp = V_loif;
3438 imo.imo_multicast_ifp = ifp;
3440 if (m->m_flags & M_IGMPV2) {
3443 m0 = igmp_v3_encap_report(ifp, m);
3445 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m);
3447 IPSTAT_INC(ips_odropped);
3452 igmp_scrub_context(m0);
3453 m->m_flags &= ~(M_PROTOFLAGS);
3454 m0->m_pkthdr.rcvif = V_loif;
3456 mac_netinet_igmp_send(ifp, m0);
3458 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL);
3460 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error);
3464 IGMPSTAT_INC(igps_snd_reports);
3468 * We must restore the existing vnet pointer before
3469 * continuing as we are run from netisr context.
3475 * Encapsulate an IGMPv3 report.
3477 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf
3478 * chain has already had its IP/IGMPv3 header prepended. In this case
3479 * the function will not attempt to prepend; the lengths and checksums
3480 * will however be re-computed.
3482 * Returns a pointer to the new mbuf chain head, or NULL if the
3483 * allocation failed.
3485 static struct mbuf *
3486 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m)
3488 struct igmp_report *igmp;
3490 int hdrlen, igmpreclen;
3492 KASSERT((m->m_flags & M_PKTHDR),
3493 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m));
3495 igmpreclen = m_length(m, NULL);
3496 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report);
3498 if (m->m_flags & M_IGMPV3_HDR) {
3499 igmpreclen -= hdrlen;
3501 M_PREPEND(m, hdrlen, M_DONTWAIT);
3504 m->m_flags |= M_IGMPV3_HDR;
3507 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen);
3509 m->m_data += sizeof(struct ip);
3510 m->m_len -= sizeof(struct ip);
3512 igmp = mtod(m, struct igmp_report *);
3513 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT;
3516 igmp->ir_numgrps = htons(m->m_pkthdr.PH_vt.vt_nrecs);
3518 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen);
3519 m->m_pkthdr.PH_vt.vt_nrecs = 0;
3521 m->m_data -= sizeof(struct ip);
3522 m->m_len += sizeof(struct ip);
3524 ip = mtod(m, struct ip *);
3525 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL;
3526 ip->ip_len = hdrlen + igmpreclen;
3528 ip->ip_p = IPPROTO_IGMP;
3531 ip->ip_src.s_addr = INADDR_ANY;
3533 if (m->m_flags & M_IGMP_LOOP) {
3534 struct in_ifaddr *ia;
3538 ip->ip_src = ia->ia_addr.sin_addr;
3539 ifa_free(&ia->ia_ifa);
3543 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP);
3550 igmp_rec_type_to_str(const int type)
3554 case IGMP_CHANGE_TO_EXCLUDE_MODE:
3557 case IGMP_CHANGE_TO_INCLUDE_MODE:
3560 case IGMP_MODE_IS_EXCLUDE:
3563 case IGMP_MODE_IS_INCLUDE:
3566 case IGMP_ALLOW_NEW_SOURCES:
3569 case IGMP_BLOCK_OLD_SOURCES:
3583 CTR1(KTR_IGMPV3, "%s: initializing", __func__);
3587 m_raopt = igmp_ra_alloc();
3589 netisr_register(&igmp_nh);
3593 igmp_sysuninit(void)
3596 CTR1(KTR_IGMPV3, "%s: tearing down", __func__);
3598 netisr_unregister(&igmp_nh);
3603 IGMP_LOCK_DESTROY();
3607 * Initialize an IGMPv3 instance.
3608 * VIMAGE: Assumes curvnet set by caller and called per vimage.
3611 vnet_igmp_iattach(const void *unused __unused)
3614 CTR1(KTR_IGMPV3, "%s: initializing", __func__);
3616 LIST_INIT(&V_igi_head);
3619 * Initialize sysctls to default values.
3621 V_igmpstat.igps_version = IGPS_VERSION_3;
3622 V_igmpstat.igps_len = sizeof(struct igmpstat);
3628 vnet_igmp_idetach(const void *unused __unused)
3631 CTR1(KTR_IGMPV3, "%s: tearing down", __func__);
3633 KASSERT(LIST_EMPTY(&V_igi_head),
3634 ("%s: igi list not empty; ifnets not detached?", __func__));
3640 static vnet_modinfo_t vnet_igmp_modinfo = {
3641 .vmi_id = VNET_MOD_IGMP,
3643 .vmi_dependson = VNET_MOD_INET,
3644 .vmi_iattach = vnet_igmp_iattach,
3645 .vmi_idetach = vnet_igmp_idetach
3650 igmp_modevent(module_t mod, int type, void *unused __unused)
3657 vnet_mod_register(&vnet_igmp_modinfo);
3659 vnet_igmp_iattach(NULL);
3664 vnet_mod_deregister(&vnet_igmp_modinfo);
3666 vnet_igmp_idetach(NULL);
3671 return (EOPNOTSUPP);
3676 static moduledata_t igmp_mod = {
3681 DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);