2 * Copyright (c) 2009 Bruce Simpson.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote
13 * products derived from this software without specific prior written
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $KAME: mld6.c,v 1.27 2001/04/04 05:17:30 itojun Exp $
32 * Copyright (c) 1988 Stephen Deering.
33 * Copyright (c) 1992, 1993
34 * The Regents of the University of California. All rights reserved.
36 * This code is derived from software contributed to Berkeley by
37 * Stephen Deering of Stanford University.
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
42 * 1. Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * 2. Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in the
46 * documentation and/or other materials provided with the distribution.
47 * 4. Neither the name of the University nor the names of its contributors
48 * may be used to endorse or promote products derived from this software
49 * without specific prior written permission.
51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * @(#)igmp.c 8.1 (Berkeley) 7/19/93
66 #include <sys/cdefs.h>
67 __FBSDID("$FreeBSD$");
70 #include "opt_inet6.h"
72 #include <sys/param.h>
73 #include <sys/systm.h>
75 #include <sys/socket.h>
76 #include <sys/protosw.h>
77 #include <sys/sysctl.h>
78 #include <sys/kernel.h>
79 #include <sys/callout.h>
80 #include <sys/malloc.h>
81 #include <sys/module.h>
85 #include <net/route.h>
88 #include <netinet/in.h>
89 #include <netinet/in_var.h>
90 #include <netinet6/in6_var.h>
91 #include <netinet/ip6.h>
92 #include <netinet6/ip6_var.h>
93 #include <netinet6/scope6_var.h>
94 #include <netinet/icmp6.h>
95 #include <netinet6/mld6.h>
96 #include <netinet6/mld6_var.h>
98 #include <security/mac/mac_framework.h>
101 #define KTR_MLD KTR_INET6
104 static struct mld_ifinfo *
105 mli_alloc_locked(struct ifnet *);
106 static void mli_delete_locked(const struct ifnet *);
107 static void mld_dispatch_packet(struct mbuf *);
108 static void mld_dispatch_queue(struct ifqueue *, int);
109 static void mld_final_leave(struct in6_multi *, struct mld_ifinfo *);
110 static void mld_fasttimo_vnet(void);
111 static int mld_handle_state_change(struct in6_multi *,
112 struct mld_ifinfo *);
113 static int mld_initial_join(struct in6_multi *, struct mld_ifinfo *,
116 static char * mld_rec_type_to_str(const int);
118 static void mld_set_version(struct mld_ifinfo *, const int);
119 static void mld_slowtimo_vnet(void);
120 static int mld_v1_input_query(struct ifnet *, const struct ip6_hdr *,
121 /*const*/ struct mld_hdr *);
122 static int mld_v1_input_report(struct ifnet *, const struct ip6_hdr *,
123 /*const*/ struct mld_hdr *);
124 static void mld_v1_process_group_timer(struct in6_multi *, const int);
125 static void mld_v1_process_querier_timers(struct mld_ifinfo *);
126 static int mld_v1_transmit_report(struct in6_multi *, const int);
127 static void mld_v1_update_group(struct in6_multi *, const int);
128 static void mld_v2_cancel_link_timers(struct mld_ifinfo *);
129 static void mld_v2_dispatch_general_query(struct mld_ifinfo *);
131 mld_v2_encap_report(struct ifnet *, struct mbuf *);
132 static int mld_v2_enqueue_filter_change(struct ifqueue *,
134 static int mld_v2_enqueue_group_record(struct ifqueue *,
135 struct in6_multi *, const int, const int, const int,
137 static int mld_v2_input_query(struct ifnet *, const struct ip6_hdr *,
138 struct mbuf *, const int, const int);
139 static int mld_v2_merge_state_changes(struct in6_multi *,
141 static void mld_v2_process_group_timers(struct mld_ifinfo *,
142 struct ifqueue *, struct ifqueue *,
143 struct in6_multi *, const int);
144 static int mld_v2_process_group_query(struct in6_multi *,
145 struct mld_ifinfo *mli, int, struct mbuf *, const int);
146 static int sysctl_mld_gsr(SYSCTL_HANDLER_ARGS);
147 static int sysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS);
150 * Normative references: RFC 2710, RFC 3590, RFC 3810.
153 * * The MLD subsystem lock ends up being system-wide for the moment,
154 * but could be per-VIMAGE later on.
155 * * The permitted lock order is: IN6_MULTI_LOCK, MLD_LOCK, IF_ADDR_LOCK.
156 * Any may be taken independently; if any are held at the same
157 * time, the above lock order must be followed.
158 * * IN6_MULTI_LOCK covers in_multi.
159 * * MLD_LOCK covers per-link state and any global variables in this file.
160 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of
161 * per-link state iterators.
164 * A special case for IPv6 is the in6_setscope() routine. ip6_output()
165 * will not accept an ifp; it wants an embedded scope ID, unlike
166 * ip_output(), which happily takes the ifp given to it. The embedded
167 * scope ID is only used by MLD to select the outgoing interface.
169 * During interface attach and detach, MLD will take MLD_LOCK *after*
170 * the IF_AFDATA_LOCK.
171 * As in6_setscope() takes IF_AFDATA_LOCK then SCOPE_LOCK, we can't call
172 * it with MLD_LOCK held without triggering an LOR. A netisr with indirect
173 * dispatch could work around this, but we'd rather not do that, as it
174 * can introduce other races.
176 * As such, we exploit the fact that the scope ID is just the interface
177 * index, and embed it in the IPv6 destination address accordingly.
178 * This is potentially NOT VALID for MLDv1 reports, as they
179 * are always sent to the multicast group itself; as MLDv2
180 * reports are always sent to ff02::16, this is not an issue
181 * when MLDv2 is in use.
183 * This does not however eliminate the LOR when ip6_output() itself
184 * calls in6_setscope() internally whilst MLD_LOCK is held. This will
185 * trigger a LOR warning in WITNESS when the ifnet is detached.
187 * The right answer is probably to make IF_AFDATA_LOCK an rwlock, given
188 * how it's used across the network stack. Here we're simply exploiting
189 * the fact that MLD runs at a similar layer in the stack to scope6.c.
192 * * Each in6_multi corresponds to an ifp, and each ifp corresponds
193 * to a vnet in ifp->if_vnet.
195 static struct mtx mld_mtx;
196 MALLOC_DEFINE(M_MLD, "mld", "mld state");
198 #define MLD_EMBEDSCOPE(pin6, zoneid) \
199 (pin6)->s6_addr16[1] = htons((zoneid) & 0xFFFF)
202 * VIMAGE-wide globals.
204 static VNET_DEFINE(struct timeval, mld_gsrdelay) = {10, 0};
205 static VNET_DEFINE(LIST_HEAD(, mld_ifinfo), mli_head);
206 static VNET_DEFINE(int, interface_timers_running6);
207 static VNET_DEFINE(int, state_change_timers_running6);
208 static VNET_DEFINE(int, current_state_timers_running6);
210 #define V_mld_gsrdelay VNET(mld_gsrdelay)
211 #define V_mli_head VNET(mli_head)
212 #define V_interface_timers_running6 VNET(interface_timers_running6)
213 #define V_state_change_timers_running6 VNET(state_change_timers_running6)
214 #define V_current_state_timers_running6 VNET(current_state_timers_running6)
216 SYSCTL_DECL(_net_inet6); /* Note: Not in any common header. */
218 SYSCTL_NODE(_net_inet6, OID_AUTO, mld, CTLFLAG_RW, 0,
219 "IPv6 Multicast Listener Discovery");
222 * Virtualized sysctls.
224 SYSCTL_VNET_PROC(_net_inet6_mld, OID_AUTO, gsrdelay,
225 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
226 &VNET_NAME(mld_gsrdelay.tv_sec), 0, sysctl_mld_gsr, "I",
227 "Rate limit for MLDv2 Group-and-Source queries in seconds");
230 * Non-virtualized sysctls.
232 SYSCTL_NODE(_net_inet6_mld, OID_AUTO, ifinfo, CTLFLAG_RD | CTLFLAG_MPSAFE,
233 sysctl_mld_ifinfo, "Per-interface MLDv2 state");
235 static int mld_v1enable = 1;
236 SYSCTL_INT(_net_inet6_mld, OID_AUTO, v1enable, CTLFLAG_RW,
237 &mld_v1enable, 0, "Enable fallback to MLDv1");
238 TUNABLE_INT("net.inet6.mld.v1enable", &mld_v1enable);
240 static int mld_use_allow = 1;
241 SYSCTL_INT(_net_inet6_mld, OID_AUTO, use_allow, CTLFLAG_RW,
242 &mld_use_allow, 0, "Use ALLOW/BLOCK for RFC 4604 SSM joins/leaves");
243 TUNABLE_INT("net.inet6.mld.use_allow", &mld_use_allow);
246 * Packed Router Alert option structure declaration.
251 struct ip6_opt_router ra;
255 * Router Alert hop-by-hop option header.
257 static struct mld_raopt mld_ra = {
259 .pad = { .ip6o_type = IP6OPT_PADN, 0 },
261 .ip6or_type = IP6OPT_ROUTER_ALERT,
262 .ip6or_len = IP6OPT_RTALERT_LEN - 2,
263 .ip6or_value[0] = ((IP6OPT_RTALERT_MLD >> 8) & 0xFF),
264 .ip6or_value[1] = (IP6OPT_RTALERT_MLD & 0xFF)
267 static struct ip6_pktopts mld_po;
270 mld_save_context(struct mbuf *m, struct ifnet *ifp)
274 m->m_pkthdr.header = ifp->if_vnet;
276 m->m_pkthdr.flowid = ifp->if_index;
280 mld_scrub_context(struct mbuf *m)
283 m->m_pkthdr.header = NULL;
284 m->m_pkthdr.flowid = 0;
288 * Restore context from a queued output chain.
289 * Return saved ifindex.
291 * VIMAGE: The assertion is there to make sure that we
292 * actually called CURVNET_SET() with what's in the mbuf chain.
294 static __inline uint32_t
295 mld_restore_context(struct mbuf *m)
298 #if defined(VIMAGE) && defined(INVARIANTS)
299 KASSERT(curvnet == m->m_pkthdr.header,
300 ("%s: called when curvnet was not restored", __func__));
302 return (m->m_pkthdr.flowid);
306 * Retrieve or set threshold between group-source queries in seconds.
308 * VIMAGE: Assume curvnet set by caller.
309 * SMPng: NOTE: Serialized by MLD lock.
312 sysctl_mld_gsr(SYSCTL_HANDLER_ARGS)
317 error = sysctl_wire_old_buffer(req, sizeof(int));
323 i = V_mld_gsrdelay.tv_sec;
325 error = sysctl_handle_int(oidp, &i, 0, req);
326 if (error || !req->newptr)
329 if (i < -1 || i >= 60) {
334 CTR2(KTR_MLD, "change mld_gsrdelay from %d to %d",
335 V_mld_gsrdelay.tv_sec, i);
336 V_mld_gsrdelay.tv_sec = i;
344 * Expose struct mld_ifinfo to userland, keyed by ifindex.
345 * For use by ifmcstat(8).
347 * SMPng: NOTE: Does an unlocked ifindex space read.
348 * VIMAGE: Assume curvnet set by caller. The node handler itself
349 * is not directly virtualized.
352 sysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS)
358 struct mld_ifinfo *mli;
363 if (req->newptr != NULL)
369 error = sysctl_wire_old_buffer(req, sizeof(struct mld_ifinfo));
376 if (name[0] <= 0 || name[0] > V_if_index) {
383 ifp = ifnet_byindex(name[0]);
387 LIST_FOREACH(mli, &V_mli_head, mli_link) {
388 if (ifp == mli->mli_ifp) {
389 error = SYSCTL_OUT(req, mli,
390 sizeof(struct mld_ifinfo));
402 * Dispatch an entire queue of pending packet chains.
403 * VIMAGE: Assumes the vnet pointer has been set.
406 mld_dispatch_queue(struct ifqueue *ifq, int limit)
414 CTR3(KTR_MLD, "%s: dispatch %p from %p", __func__, ifq, m);
415 mld_dispatch_packet(m);
422 * Filter outgoing MLD report state by group.
424 * Reports are ALWAYS suppressed for ALL-HOSTS (ff02::1)
425 * and node-local addresses. However, kernel and socket consumers
426 * always embed the KAME scope ID in the address provided, so strip it
427 * when performing comparison.
428 * Note: This is not the same as the *multicast* scope.
430 * Return zero if the given group is one for which MLD reports
431 * should be suppressed, or non-zero if reports should be issued.
434 mld_is_addr_reported(const struct in6_addr *addr)
437 KASSERT(IN6_IS_ADDR_MULTICAST(addr), ("%s: not multicast", __func__));
439 if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_NODELOCAL)
442 if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_LINKLOCAL) {
443 struct in6_addr tmp = *addr;
444 in6_clearscope(&tmp);
445 if (IN6_ARE_ADDR_EQUAL(&tmp, &in6addr_linklocal_allnodes))
453 * Attach MLD when PF_INET6 is attached to an interface.
455 * SMPng: Normally called with IF_AFDATA_LOCK held.
458 mld_domifattach(struct ifnet *ifp)
460 struct mld_ifinfo *mli;
462 CTR3(KTR_MLD, "%s: called for ifp %p(%s)",
463 __func__, ifp, ifp->if_xname);
467 mli = mli_alloc_locked(ifp);
468 if (!(ifp->if_flags & IFF_MULTICAST))
469 mli->mli_flags |= MLIF_SILENT;
471 mli->mli_flags |= MLIF_USEALLOW;
479 * VIMAGE: assume curvnet set by caller.
481 static struct mld_ifinfo *
482 mli_alloc_locked(/*const*/ struct ifnet *ifp)
484 struct mld_ifinfo *mli;
488 mli = malloc(sizeof(struct mld_ifinfo), M_MLD, M_NOWAIT|M_ZERO);
493 mli->mli_version = MLD_VERSION_2;
495 mli->mli_rv = MLD_RV_INIT;
496 mli->mli_qi = MLD_QI_INIT;
497 mli->mli_qri = MLD_QRI_INIT;
498 mli->mli_uri = MLD_URI_INIT;
500 SLIST_INIT(&mli->mli_relinmhead);
503 * Responses to general queries are subject to bounds.
505 IFQ_SET_MAXLEN(&mli->mli_gq, MLD_MAX_RESPONSE_PACKETS);
507 LIST_INSERT_HEAD(&V_mli_head, mli, mli_link);
509 CTR2(KTR_MLD, "allocate mld_ifinfo for ifp %p(%s)",
519 * NOTE: Some finalization tasks need to run before the protocol domain
520 * is detached, but also before the link layer does its cleanup.
521 * Run before link-layer cleanup; cleanup groups, but do not free MLD state.
523 * SMPng: Caller must hold IN6_MULTI_LOCK().
524 * Must take IF_ADDR_LOCK() to cover if_multiaddrs iterator.
525 * XXX This routine is also bitten by unlocked ifma_protospec access.
528 mld_ifdetach(struct ifnet *ifp)
530 struct mld_ifinfo *mli;
531 struct ifmultiaddr *ifma;
532 struct in6_multi *inm, *tinm;
534 CTR3(KTR_MLD, "%s: called for ifp %p(%s)", __func__, ifp,
537 IN6_MULTI_LOCK_ASSERT();
540 mli = MLD_IFINFO(ifp);
541 if (mli->mli_version == MLD_VERSION_2) {
543 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
544 if (ifma->ifma_addr->sa_family != AF_INET6 ||
545 ifma->ifma_protospec == NULL)
547 inm = (struct in6_multi *)ifma->ifma_protospec;
548 if (inm->in6m_state == MLD_LEAVING_MEMBER) {
549 SLIST_INSERT_HEAD(&mli->mli_relinmhead,
552 in6m_clear_recorded(inm);
555 SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead, in6m_nrele,
557 SLIST_REMOVE_HEAD(&mli->mli_relinmhead, in6m_nrele);
558 in6m_release_locked(inm);
566 * Hook for domifdetach.
567 * Runs after link-layer cleanup; free MLD state.
569 * SMPng: Normally called with IF_AFDATA_LOCK held.
572 mld_domifdetach(struct ifnet *ifp)
575 CTR3(KTR_MLD, "%s: called for ifp %p(%s)",
576 __func__, ifp, ifp->if_xname);
579 mli_delete_locked(ifp);
584 mli_delete_locked(const struct ifnet *ifp)
586 struct mld_ifinfo *mli, *tmli;
588 CTR3(KTR_MLD, "%s: freeing mld_ifinfo for ifp %p(%s)",
589 __func__, ifp, ifp->if_xname);
593 LIST_FOREACH_SAFE(mli, &V_mli_head, mli_link, tmli) {
594 if (mli->mli_ifp == ifp) {
596 * Free deferred General Query responses.
598 _IF_DRAIN(&mli->mli_gq);
600 LIST_REMOVE(mli, mli_link);
602 KASSERT(SLIST_EMPTY(&mli->mli_relinmhead),
603 ("%s: there are dangling in_multi references",
611 panic("%s: mld_ifinfo not found for ifp %p\n", __func__, ifp);
616 * Process a received MLDv1 general or address-specific query.
617 * Assumes that the query header has been pulled up to sizeof(mld_hdr).
619 * NOTE: Can't be fully const correct as we temporarily embed scope ID in
620 * mld_addr. This is OK as we own the mbuf chain.
623 mld_v1_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6,
624 /*const*/ struct mld_hdr *mld)
626 struct ifmultiaddr *ifma;
627 struct mld_ifinfo *mli;
628 struct in6_multi *inm;
629 int is_general_query;
632 char ip6tbuf[INET6_ADDRSTRLEN];
635 is_general_query = 0;
638 CTR3(KTR_MLD, "ignore v1 query %s on ifp %p(%s)",
639 ip6_sprintf(ip6tbuf, &mld->mld_addr),
645 * RFC3810 Section 6.2: MLD queries must originate from
646 * a router's link-local address.
648 if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
649 CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
650 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
656 * Do address field validation upfront before we accept
659 if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) {
661 * MLDv1 General Query.
662 * If this was not sent to the all-nodes group, ignore it.
667 in6_clearscope(&dst);
668 if (!IN6_ARE_ADDR_EQUAL(&dst, &in6addr_linklocal_allnodes))
670 is_general_query = 1;
673 * Embed scope ID of receiving interface in MLD query for
674 * lookup whilst we don't hold other locks.
676 in6_setscope(&mld->mld_addr, ifp, NULL);
684 * Switch to MLDv1 host compatibility mode.
686 mli = MLD_IFINFO(ifp);
687 KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp));
688 mld_set_version(mli, MLD_VERSION_1);
690 timer = (ntohs(mld->mld_maxdelay) * PR_FASTHZ) / MLD_TIMER_SCALE;
694 if (is_general_query) {
696 * For each reporting group joined on this
697 * interface, kick the report timer.
699 CTR2(KTR_MLD, "process v1 general query on ifp %p(%s)",
701 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
702 if (ifma->ifma_addr->sa_family != AF_INET6 ||
703 ifma->ifma_protospec == NULL)
705 inm = (struct in6_multi *)ifma->ifma_protospec;
706 mld_v1_update_group(inm, timer);
710 * MLDv1 Group-Specific Query.
711 * If this is a group-specific MLDv1 query, we need only
712 * look up the single group to process it.
714 inm = in6m_lookup_locked(ifp, &mld->mld_addr);
716 CTR3(KTR_MLD, "process v1 query %s on ifp %p(%s)",
717 ip6_sprintf(ip6tbuf, &mld->mld_addr),
719 mld_v1_update_group(inm, timer);
721 /* XXX Clear embedded scope ID as userland won't expect it. */
722 in6_clearscope(&mld->mld_addr);
733 * Update the report timer on a group in response to an MLDv1 query.
735 * If we are becoming the reporting member for this group, start the timer.
736 * If we already are the reporting member for this group, and timer is
737 * below the threshold, reset it.
739 * We may be updating the group for the first time since we switched
740 * to MLDv2. If we are, then we must clear any recorded source lists,
741 * and transition to REPORTING state; the group timer is overloaded
742 * for group and group-source query responses.
744 * Unlike MLDv2, the delay per group should be jittered
745 * to avoid bursts of MLDv1 reports.
748 mld_v1_update_group(struct in6_multi *inm, const int timer)
751 char ip6tbuf[INET6_ADDRSTRLEN];
754 CTR4(KTR_MLD, "%s: %s/%s timer=%d", __func__,
755 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
756 inm->in6m_ifp->if_xname, timer);
758 IN6_MULTI_LOCK_ASSERT();
760 switch (inm->in6m_state) {
762 case MLD_SILENT_MEMBER:
764 case MLD_REPORTING_MEMBER:
765 if (inm->in6m_timer != 0 &&
766 inm->in6m_timer <= timer) {
767 CTR1(KTR_MLD, "%s: REPORTING and timer running, "
768 "skipping.", __func__);
772 case MLD_SG_QUERY_PENDING_MEMBER:
773 case MLD_G_QUERY_PENDING_MEMBER:
774 case MLD_IDLE_MEMBER:
775 case MLD_LAZY_MEMBER:
776 case MLD_AWAKENING_MEMBER:
777 CTR1(KTR_MLD, "%s: ->REPORTING", __func__);
778 inm->in6m_state = MLD_REPORTING_MEMBER;
779 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
780 V_current_state_timers_running6 = 1;
782 case MLD_SLEEPING_MEMBER:
783 CTR1(KTR_MLD, "%s: ->AWAKENING", __func__);
784 inm->in6m_state = MLD_AWAKENING_MEMBER;
786 case MLD_LEAVING_MEMBER:
792 * Process a received MLDv2 general, group-specific or
793 * group-and-source-specific query.
795 * Assumes that the query header has been pulled up to sizeof(mldv2_query).
797 * Return 0 if successful, otherwise an appropriate error code is returned.
800 mld_v2_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6,
801 struct mbuf *m, const int off, const int icmp6len)
803 struct mld_ifinfo *mli;
804 struct mldv2_query *mld;
805 struct in6_multi *inm;
806 uint32_t maxdelay, nsrc, qqi;
807 int is_general_query;
811 char ip6tbuf[INET6_ADDRSTRLEN];
814 is_general_query = 0;
817 * RFC3810 Section 6.2: MLD queries must originate from
818 * a router's link-local address.
820 if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
821 CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
822 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
827 CTR2(KTR_MLD, "input v2 query on ifp %p(%s)", ifp, ifp->if_xname);
829 mld = (struct mldv2_query *)(mtod(m, uint8_t *) + off);
831 maxdelay = ntohs(mld->mld_maxdelay); /* in 1/10ths of a second */
832 if (maxdelay >= 32678) {
833 maxdelay = (MLD_MRC_MANT(maxdelay) | 0x1000) <<
834 (MLD_MRC_EXP(maxdelay) + 3);
836 timer = (maxdelay * PR_FASTHZ) / MLD_TIMER_SCALE;
840 qrv = MLD_QRV(mld->mld_misc);
842 CTR3(KTR_MLD, "%s: clamping qrv %d to %d", __func__,
849 qqi = MLD_QQIC_MANT(mld->mld_qqi) <<
850 (MLD_QQIC_EXP(mld->mld_qqi) + 3);
853 nsrc = ntohs(mld->mld_numsrc);
854 if (nsrc > MLD_MAX_GS_SOURCES)
856 if (icmp6len < sizeof(struct mldv2_query) +
857 (nsrc * sizeof(struct in6_addr)))
861 * Do further input validation upfront to avoid resetting timers
862 * should we need to discard this query.
864 if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) {
866 * General Queries SHOULD be directed to ff02::1.
867 * A general query with a source list has undefined
868 * behaviour; discard it.
873 in6_clearscope(&dst);
874 if (!IN6_ARE_ADDR_EQUAL(&dst, &in6addr_linklocal_allnodes) ||
877 is_general_query = 1;
880 * Embed scope ID of receiving interface in MLD query for
881 * lookup whilst we don't hold other locks (due to KAME
882 * locking lameness). We own this mbuf chain just now.
884 in6_setscope(&mld->mld_addr, ifp, NULL);
891 mli = MLD_IFINFO(ifp);
892 KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp));
895 * Discard the v2 query if we're in Compatibility Mode.
896 * The RFC is pretty clear that hosts need to stay in MLDv1 mode
897 * until the Old Version Querier Present timer expires.
899 if (mli->mli_version != MLD_VERSION_2)
902 mld_set_version(mli, MLD_VERSION_2);
905 mli->mli_qri = maxdelay;
907 CTR4(KTR_MLD, "%s: qrv %d qi %d maxdelay %d", __func__, qrv, qqi,
910 if (is_general_query) {
912 * MLDv2 General Query.
914 * Schedule a current-state report on this ifp for
915 * all groups, possibly containing source lists.
917 * If there is a pending General Query response
918 * scheduled earlier than the selected delay, do
919 * not schedule any other reports.
920 * Otherwise, reset the interface timer.
922 CTR2(KTR_MLD, "process v2 general query on ifp %p(%s)",
924 if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer) {
925 mli->mli_v2_timer = MLD_RANDOM_DELAY(timer);
926 V_interface_timers_running6 = 1;
930 * MLDv2 Group-specific or Group-and-source-specific Query.
932 * Group-source-specific queries are throttled on
933 * a per-group basis to defeat denial-of-service attempts.
934 * Queries for groups we are not a member of on this
935 * link are simply ignored.
937 inm = in6m_lookup_locked(ifp, &mld->mld_addr);
941 if (!ratecheck(&inm->in6m_lastgsrtv,
943 CTR1(KTR_MLD, "%s: GS query throttled.",
948 CTR2(KTR_MLD, "process v2 group query on ifp %p(%s)",
951 * If there is a pending General Query response
952 * scheduled sooner than the selected delay, no
953 * further report need be scheduled.
954 * Otherwise, prepare to respond to the
955 * group-specific or group-and-source query.
957 if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer)
958 mld_v2_process_group_query(inm, mli, timer, m, off);
960 /* XXX Clear embedded scope ID as userland won't expect it. */
961 in6_clearscope(&mld->mld_addr);
973 * Process a recieved MLDv2 group-specific or group-and-source-specific
975 * Return <0 if any error occured. Currently this is ignored.
978 mld_v2_process_group_query(struct in6_multi *inm, struct mld_ifinfo *mli,
979 int timer, struct mbuf *m0, const int off)
981 struct mldv2_query *mld;
985 IN6_MULTI_LOCK_ASSERT();
989 mld = (struct mldv2_query *)(mtod(m0, uint8_t *) + off);
991 switch (inm->in6m_state) {
993 case MLD_SILENT_MEMBER:
994 case MLD_SLEEPING_MEMBER:
995 case MLD_LAZY_MEMBER:
996 case MLD_AWAKENING_MEMBER:
997 case MLD_IDLE_MEMBER:
998 case MLD_LEAVING_MEMBER:
1001 case MLD_REPORTING_MEMBER:
1002 case MLD_G_QUERY_PENDING_MEMBER:
1003 case MLD_SG_QUERY_PENDING_MEMBER:
1007 nsrc = ntohs(mld->mld_numsrc);
1010 * Deal with group-specific queries upfront.
1011 * If any group query is already pending, purge any recorded
1012 * source-list state if it exists, and schedule a query response
1013 * for this group-specific query.
1016 if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER ||
1017 inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER) {
1018 in6m_clear_recorded(inm);
1019 timer = min(inm->in6m_timer, timer);
1021 inm->in6m_state = MLD_G_QUERY_PENDING_MEMBER;
1022 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
1023 V_current_state_timers_running6 = 1;
1028 * Deal with the case where a group-and-source-specific query has
1029 * been received but a group-specific query is already pending.
1031 if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER) {
1032 timer = min(inm->in6m_timer, timer);
1033 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
1034 V_current_state_timers_running6 = 1;
1039 * Finally, deal with the case where a group-and-source-specific
1040 * query has been received, where a response to a previous g-s-r
1041 * query exists, or none exists.
1042 * In this case, we need to parse the source-list which the Querier
1043 * has provided us with and check if we have any source list filter
1044 * entries at T1 for these sources. If we do not, there is no need
1045 * schedule a report and the query may be dropped.
1046 * If we do, we must record them and schedule a current-state
1047 * report for those sources.
1049 if (inm->in6m_nsrc > 0) {
1056 soff = off + sizeof(struct mldv2_query);
1058 for (i = 0; i < nsrc; i++) {
1059 sp = mtod(m, uint8_t *) + soff;
1060 retval = in6m_record_source(inm,
1061 (const struct in6_addr *)sp);
1064 nrecorded += retval;
1065 soff += sizeof(struct in6_addr);
1066 if (soff >= m->m_len) {
1067 soff = soff - m->m_len;
1073 if (nrecorded > 0) {
1075 "%s: schedule response to SG query", __func__);
1076 inm->in6m_state = MLD_SG_QUERY_PENDING_MEMBER;
1077 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
1078 V_current_state_timers_running6 = 1;
1086 * Process a received MLDv1 host membership report.
1087 * Assumes mld points to mld_hdr in pulled up mbuf chain.
1089 * NOTE: Can't be fully const correct as we temporarily embed scope ID in
1090 * mld_addr. This is OK as we own the mbuf chain.
1093 mld_v1_input_report(struct ifnet *ifp, const struct ip6_hdr *ip6,
1094 /*const*/ struct mld_hdr *mld)
1096 struct in6_addr src, dst;
1097 struct in6_ifaddr *ia;
1098 struct in6_multi *inm;
1100 char ip6tbuf[INET6_ADDRSTRLEN];
1103 if (!mld_v1enable) {
1104 CTR3(KTR_MLD, "ignore v1 report %s on ifp %p(%s)",
1105 ip6_sprintf(ip6tbuf, &mld->mld_addr),
1106 ifp, ifp->if_xname);
1110 if (ifp->if_flags & IFF_LOOPBACK)
1114 * MLDv1 reports must originate from a host's link-local address,
1115 * or the unspecified address (when booting).
1118 in6_clearscope(&src);
1119 if (!IN6_IS_SCOPE_LINKLOCAL(&src) && !IN6_IS_ADDR_UNSPECIFIED(&src)) {
1120 CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
1121 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
1122 ifp, ifp->if_xname);
1127 * RFC2710 Section 4: MLDv1 reports must pertain to a multicast
1128 * group, and must be directed to the group itself.
1131 in6_clearscope(&dst);
1132 if (!IN6_IS_ADDR_MULTICAST(&mld->mld_addr) ||
1133 !IN6_ARE_ADDR_EQUAL(&mld->mld_addr, &dst)) {
1134 CTR3(KTR_MLD, "ignore v1 query dst %s on ifp %p(%s)",
1135 ip6_sprintf(ip6tbuf, &ip6->ip6_dst),
1136 ifp, ifp->if_xname);
1141 * Make sure we don't hear our own membership report, as fast
1142 * leave requires knowing that we are the only member of a
1143 * group. Assume we used the link-local address if available,
1144 * otherwise look for ::.
1146 * XXX Note that scope ID comparison is needed for the address
1147 * returned by in6ifa_ifpforlinklocal(), but SHOULD NOT be
1148 * performed for the on-wire address.
1150 ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
1151 if ((ia && IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, IA6_IN6(ia))) ||
1152 (ia == NULL && IN6_IS_ADDR_UNSPECIFIED(&src))) {
1154 ifa_free(&ia->ia_ifa);
1158 ifa_free(&ia->ia_ifa);
1160 CTR3(KTR_MLD, "process v1 report %s on ifp %p(%s)",
1161 ip6_sprintf(ip6tbuf, &mld->mld_addr), ifp, ifp->if_xname);
1164 * Embed scope ID of receiving interface in MLD query for lookup
1165 * whilst we don't hold other locks (due to KAME locking lameness).
1167 if (!IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr))
1168 in6_setscope(&mld->mld_addr, ifp, NULL);
1175 * MLDv1 report suppression.
1176 * If we are a member of this group, and our membership should be
1177 * reported, and our group timer is pending or about to be reset,
1178 * stop our group timer by transitioning to the 'lazy' state.
1180 inm = in6m_lookup_locked(ifp, &mld->mld_addr);
1182 struct mld_ifinfo *mli;
1184 mli = inm->in6m_mli;
1185 KASSERT(mli != NULL,
1186 ("%s: no mli for ifp %p", __func__, ifp));
1189 * If we are in MLDv2 host mode, do not allow the
1190 * other host's MLDv1 report to suppress our reports.
1192 if (mli->mli_version == MLD_VERSION_2)
1195 inm->in6m_timer = 0;
1197 switch (inm->in6m_state) {
1198 case MLD_NOT_MEMBER:
1199 case MLD_SILENT_MEMBER:
1200 case MLD_SLEEPING_MEMBER:
1202 case MLD_REPORTING_MEMBER:
1203 case MLD_IDLE_MEMBER:
1204 case MLD_AWAKENING_MEMBER:
1206 "report suppressed for %s on ifp %p(%s)",
1207 ip6_sprintf(ip6tbuf, &mld->mld_addr),
1208 ifp, ifp->if_xname);
1209 case MLD_LAZY_MEMBER:
1210 inm->in6m_state = MLD_LAZY_MEMBER;
1212 case MLD_G_QUERY_PENDING_MEMBER:
1213 case MLD_SG_QUERY_PENDING_MEMBER:
1214 case MLD_LEAVING_MEMBER:
1221 IF_ADDR_UNLOCK(ifp);
1224 /* XXX Clear embedded scope ID as userland won't expect it. */
1225 in6_clearscope(&mld->mld_addr);
1233 * Assume query messages which fit in a single ICMPv6 message header
1234 * have been pulled up.
1235 * Assume that userland will want to see the message, even if it
1236 * otherwise fails kernel input validation; do not free it.
1237 * Pullup may however free the mbuf chain m if it fails.
1239 * Return IPPROTO_DONE if we freed m. Otherwise, return 0.
1242 mld_input(struct mbuf *m, int off, int icmp6len)
1245 struct ip6_hdr *ip6;
1246 struct mld_hdr *mld;
1249 CTR3(KTR_MLD, "%s: called w/mbuf (%p,%d)", __func__, m, off);
1251 ifp = m->m_pkthdr.rcvif;
1253 ip6 = mtod(m, struct ip6_hdr *);
1255 /* Pullup to appropriate size. */
1256 mld = (struct mld_hdr *)(mtod(m, uint8_t *) + off);
1257 if (mld->mld_type == MLD_LISTENER_QUERY &&
1258 icmp6len >= sizeof(struct mldv2_query)) {
1259 mldlen = sizeof(struct mldv2_query);
1261 mldlen = sizeof(struct mld_hdr);
1263 IP6_EXTHDR_GET(mld, struct mld_hdr *, m, off, mldlen);
1265 ICMP6STAT_INC(icp6s_badlen);
1266 return (IPPROTO_DONE);
1270 * Userland needs to see all of this traffic for implementing
1271 * the endpoint discovery portion of multicast routing.
1273 switch (mld->mld_type) {
1274 case MLD_LISTENER_QUERY:
1275 icmp6_ifstat_inc(ifp, ifs6_in_mldquery);
1276 if (icmp6len == sizeof(struct mld_hdr)) {
1277 if (mld_v1_input_query(ifp, ip6, mld) != 0)
1279 } else if (icmp6len >= sizeof(struct mldv2_query)) {
1280 if (mld_v2_input_query(ifp, ip6, m, off,
1285 case MLD_LISTENER_REPORT:
1286 icmp6_ifstat_inc(ifp, ifs6_in_mldreport);
1287 if (mld_v1_input_report(ifp, ip6, mld) != 0)
1290 case MLDV2_LISTENER_REPORT:
1291 icmp6_ifstat_inc(ifp, ifs6_in_mldreport);
1293 case MLD_LISTENER_DONE:
1294 icmp6_ifstat_inc(ifp, ifs6_in_mlddone);
1304 * Fast timeout handler (global).
1305 * VIMAGE: Timeout handlers are expected to service all vimages.
1310 VNET_ITERATOR_DECL(vnet_iter);
1312 VNET_LIST_RLOCK_NOSLEEP();
1313 VNET_FOREACH(vnet_iter) {
1314 CURVNET_SET(vnet_iter);
1315 mld_fasttimo_vnet();
1318 VNET_LIST_RUNLOCK_NOSLEEP();
1322 * Fast timeout handler (per-vnet).
1324 * VIMAGE: Assume caller has set up our curvnet.
1327 mld_fasttimo_vnet(void)
1329 struct ifqueue scq; /* State-change packets */
1330 struct ifqueue qrq; /* Query response packets */
1332 struct mld_ifinfo *mli;
1333 struct ifmultiaddr *ifma, *tifma;
1334 struct in6_multi *inm;
1340 * Quick check to see if any work needs to be done, in order to
1341 * minimize the overhead of fasttimo processing.
1342 * SMPng: XXX Unlocked reads.
1344 if (!V_current_state_timers_running6 &&
1345 !V_interface_timers_running6 &&
1346 !V_state_change_timers_running6)
1353 * MLDv2 General Query response timer processing.
1355 if (V_interface_timers_running6) {
1356 CTR1(KTR_MLD, "%s: interface timers running", __func__);
1358 V_interface_timers_running6 = 0;
1359 LIST_FOREACH(mli, &V_mli_head, mli_link) {
1360 if (mli->mli_v2_timer == 0) {
1362 } else if (--mli->mli_v2_timer == 0) {
1363 mld_v2_dispatch_general_query(mli);
1365 V_interface_timers_running6 = 1;
1370 if (!V_current_state_timers_running6 &&
1371 !V_state_change_timers_running6)
1374 V_current_state_timers_running6 = 0;
1375 V_state_change_timers_running6 = 0;
1377 CTR1(KTR_MLD, "%s: state change timers running", __func__);
1380 * MLD host report and state-change timer processing.
1381 * Note: Processing a v2 group timer may remove a node.
1383 LIST_FOREACH(mli, &V_mli_head, mli_link) {
1386 if (mli->mli_version == MLD_VERSION_2) {
1387 uri_fasthz = MLD_RANDOM_DELAY(mli->mli_uri *
1390 memset(&qrq, 0, sizeof(struct ifqueue));
1391 IFQ_SET_MAXLEN(&qrq, MLD_MAX_G_GS_PACKETS);
1393 memset(&scq, 0, sizeof(struct ifqueue));
1394 IFQ_SET_MAXLEN(&scq, MLD_MAX_STATE_CHANGE_PACKETS);
1398 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link,
1400 if (ifma->ifma_addr->sa_family != AF_INET6 ||
1401 ifma->ifma_protospec == NULL)
1403 inm = (struct in6_multi *)ifma->ifma_protospec;
1404 switch (mli->mli_version) {
1407 * XXX Drop IF_ADDR lock temporarily to
1408 * avoid recursion caused by a potential
1409 * call by in6ifa_ifpforlinklocal().
1412 IF_ADDR_UNLOCK(ifp);
1413 mld_v1_process_group_timer(inm,
1418 mld_v2_process_group_timers(mli, &qrq,
1419 &scq, inm, uri_fasthz);
1423 IF_ADDR_UNLOCK(ifp);
1425 if (mli->mli_version == MLD_VERSION_2) {
1426 struct in6_multi *tinm;
1428 mld_dispatch_queue(&qrq, 0);
1429 mld_dispatch_queue(&scq, 0);
1432 * Free the in_multi reference(s) for
1435 SLIST_FOREACH_SAFE(inm, &mli->mli_relinmhead,
1437 SLIST_REMOVE_HEAD(&mli->mli_relinmhead,
1439 in6m_release_locked(inm);
1450 * Update host report group timer.
1451 * Will update the global pending timer flags.
1454 mld_v1_process_group_timer(struct in6_multi *inm, const int version)
1456 int report_timer_expired;
1458 IN6_MULTI_LOCK_ASSERT();
1461 if (inm->in6m_timer == 0) {
1462 report_timer_expired = 0;
1463 } else if (--inm->in6m_timer == 0) {
1464 report_timer_expired = 1;
1466 V_current_state_timers_running6 = 1;
1470 switch (inm->in6m_state) {
1471 case MLD_NOT_MEMBER:
1472 case MLD_SILENT_MEMBER:
1473 case MLD_IDLE_MEMBER:
1474 case MLD_LAZY_MEMBER:
1475 case MLD_SLEEPING_MEMBER:
1476 case MLD_AWAKENING_MEMBER:
1478 case MLD_REPORTING_MEMBER:
1479 if (report_timer_expired) {
1480 inm->in6m_state = MLD_IDLE_MEMBER;
1481 (void)mld_v1_transmit_report(inm,
1482 MLD_LISTENER_REPORT);
1485 case MLD_G_QUERY_PENDING_MEMBER:
1486 case MLD_SG_QUERY_PENDING_MEMBER:
1487 case MLD_LEAVING_MEMBER:
1493 * Update a group's timers for MLDv2.
1494 * Will update the global pending timer flags.
1495 * Note: Unlocked read from mli.
1498 mld_v2_process_group_timers(struct mld_ifinfo *mli,
1499 struct ifqueue *qrq, struct ifqueue *scq,
1500 struct in6_multi *inm, const int uri_fasthz)
1502 int query_response_timer_expired;
1503 int state_change_retransmit_timer_expired;
1505 char ip6tbuf[INET6_ADDRSTRLEN];
1508 IN6_MULTI_LOCK_ASSERT();
1511 query_response_timer_expired = 0;
1512 state_change_retransmit_timer_expired = 0;
1515 * During a transition from compatibility mode back to MLDv2,
1516 * a group record in REPORTING state may still have its group
1517 * timer active. This is a no-op in this function; it is easier
1518 * to deal with it here than to complicate the slow-timeout path.
1520 if (inm->in6m_timer == 0) {
1521 query_response_timer_expired = 0;
1522 } else if (--inm->in6m_timer == 0) {
1523 query_response_timer_expired = 1;
1525 V_current_state_timers_running6 = 1;
1528 if (inm->in6m_sctimer == 0) {
1529 state_change_retransmit_timer_expired = 0;
1530 } else if (--inm->in6m_sctimer == 0) {
1531 state_change_retransmit_timer_expired = 1;
1533 V_state_change_timers_running6 = 1;
1536 /* We are in fasttimo, so be quick about it. */
1537 if (!state_change_retransmit_timer_expired &&
1538 !query_response_timer_expired)
1541 switch (inm->in6m_state) {
1542 case MLD_NOT_MEMBER:
1543 case MLD_SILENT_MEMBER:
1544 case MLD_SLEEPING_MEMBER:
1545 case MLD_LAZY_MEMBER:
1546 case MLD_AWAKENING_MEMBER:
1547 case MLD_IDLE_MEMBER:
1549 case MLD_G_QUERY_PENDING_MEMBER:
1550 case MLD_SG_QUERY_PENDING_MEMBER:
1552 * Respond to a previously pending Group-Specific
1553 * or Group-and-Source-Specific query by enqueueing
1554 * the appropriate Current-State report for
1555 * immediate transmission.
1557 if (query_response_timer_expired) {
1560 retval = mld_v2_enqueue_group_record(qrq, inm, 0, 1,
1561 (inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER),
1563 CTR2(KTR_MLD, "%s: enqueue record = %d",
1565 inm->in6m_state = MLD_REPORTING_MEMBER;
1566 in6m_clear_recorded(inm);
1569 case MLD_REPORTING_MEMBER:
1570 case MLD_LEAVING_MEMBER:
1571 if (state_change_retransmit_timer_expired) {
1573 * State-change retransmission timer fired.
1574 * If there are any further pending retransmissions,
1575 * set the global pending state-change flag, and
1578 if (--inm->in6m_scrv > 0) {
1579 inm->in6m_sctimer = uri_fasthz;
1580 V_state_change_timers_running6 = 1;
1583 * Retransmit the previously computed state-change
1584 * report. If there are no further pending
1585 * retransmissions, the mbuf queue will be consumed.
1586 * Update T0 state to T1 as we have now sent
1589 (void)mld_v2_merge_state_changes(inm, scq);
1592 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
1593 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
1594 inm->in6m_ifp->if_xname);
1597 * If we are leaving the group for good, make sure
1598 * we release MLD's reference to it.
1599 * This release must be deferred using a SLIST,
1600 * as we are called from a loop which traverses
1601 * the in_ifmultiaddr TAILQ.
1603 if (inm->in6m_state == MLD_LEAVING_MEMBER &&
1604 inm->in6m_scrv == 0) {
1605 inm->in6m_state = MLD_NOT_MEMBER;
1606 SLIST_INSERT_HEAD(&mli->mli_relinmhead,
1615 * Switch to a different version on the given interface,
1616 * as per Section 9.12.
1619 mld_set_version(struct mld_ifinfo *mli, const int version)
1621 int old_version_timer;
1625 CTR4(KTR_MLD, "%s: switching to v%d on ifp %p(%s)", __func__,
1626 version, mli->mli_ifp, mli->mli_ifp->if_xname);
1628 if (version == MLD_VERSION_1) {
1630 * Compute the "Older Version Querier Present" timer as per
1633 old_version_timer = (mli->mli_rv * mli->mli_qi) + mli->mli_qri;
1634 old_version_timer *= PR_SLOWHZ;
1635 mli->mli_v1_timer = old_version_timer;
1638 if (mli->mli_v1_timer > 0 && mli->mli_version != MLD_VERSION_1) {
1639 mli->mli_version = MLD_VERSION_1;
1640 mld_v2_cancel_link_timers(mli);
1645 * Cancel pending MLDv2 timers for the given link and all groups
1646 * joined on it; state-change, general-query, and group-query timers.
1649 mld_v2_cancel_link_timers(struct mld_ifinfo *mli)
1651 struct ifmultiaddr *ifma;
1653 struct in6_multi *inm;
1655 CTR3(KTR_MLD, "%s: cancel v2 timers on ifp %p(%s)", __func__,
1656 mli->mli_ifp, mli->mli_ifp->if_xname);
1658 IN6_MULTI_LOCK_ASSERT();
1662 * Fast-track this potentially expensive operation
1663 * by checking all the global 'timer pending' flags.
1665 if (!V_interface_timers_running6 &&
1666 !V_state_change_timers_running6 &&
1667 !V_current_state_timers_running6)
1670 mli->mli_v2_timer = 0;
1675 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1676 if (ifma->ifma_addr->sa_family != AF_INET6)
1678 inm = (struct in6_multi *)ifma->ifma_protospec;
1679 switch (inm->in6m_state) {
1680 case MLD_NOT_MEMBER:
1681 case MLD_SILENT_MEMBER:
1682 case MLD_IDLE_MEMBER:
1683 case MLD_LAZY_MEMBER:
1684 case MLD_SLEEPING_MEMBER:
1685 case MLD_AWAKENING_MEMBER:
1687 case MLD_LEAVING_MEMBER:
1689 * If we are leaving the group and switching
1690 * version, we need to release the final
1691 * reference held for issuing the INCLUDE {}.
1693 * SMPNG: Must drop and re-acquire IF_ADDR_LOCK
1694 * around in6m_release_locked(), as it is not
1695 * a recursive mutex.
1697 IF_ADDR_UNLOCK(ifp);
1698 in6m_release_locked(inm);
1701 case MLD_G_QUERY_PENDING_MEMBER:
1702 case MLD_SG_QUERY_PENDING_MEMBER:
1703 in6m_clear_recorded(inm);
1705 case MLD_REPORTING_MEMBER:
1706 inm->in6m_sctimer = 0;
1707 inm->in6m_timer = 0;
1708 inm->in6m_state = MLD_REPORTING_MEMBER;
1710 * Free any pending MLDv2 state-change records.
1712 _IF_DRAIN(&inm->in6m_scq);
1716 IF_ADDR_UNLOCK(ifp);
1720 * Global slowtimo handler.
1721 * VIMAGE: Timeout handlers are expected to service all vimages.
1726 VNET_ITERATOR_DECL(vnet_iter);
1728 VNET_LIST_RLOCK_NOSLEEP();
1729 VNET_FOREACH(vnet_iter) {
1730 CURVNET_SET(vnet_iter);
1731 mld_slowtimo_vnet();
1734 VNET_LIST_RUNLOCK_NOSLEEP();
1738 * Per-vnet slowtimo handler.
1741 mld_slowtimo_vnet(void)
1743 struct mld_ifinfo *mli;
1747 LIST_FOREACH(mli, &V_mli_head, mli_link) {
1748 mld_v1_process_querier_timers(mli);
1755 * Update the Older Version Querier Present timers for a link.
1756 * See Section 9.12 of RFC 3810.
1759 mld_v1_process_querier_timers(struct mld_ifinfo *mli)
1764 if (mli->mli_version != MLD_VERSION_2 && --mli->mli_v1_timer == 0) {
1766 * MLDv1 Querier Present timer expired; revert to MLDv2.
1769 "%s: transition from v%d -> v%d on %p(%s)",
1770 __func__, mli->mli_version, MLD_VERSION_2,
1771 mli->mli_ifp, mli->mli_ifp->if_xname);
1772 mli->mli_version = MLD_VERSION_2;
1777 * Transmit an MLDv1 report immediately.
1780 mld_v1_transmit_report(struct in6_multi *in6m, const int type)
1783 struct in6_ifaddr *ia;
1784 struct ip6_hdr *ip6;
1785 struct mbuf *mh, *md;
1786 struct mld_hdr *mld;
1788 IN6_MULTI_LOCK_ASSERT();
1791 ifp = in6m->in6m_ifp;
1792 ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
1793 /* ia may be NULL if link-local address is tentative. */
1795 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
1798 ifa_free(&ia->ia_ifa);
1801 MGET(md, M_DONTWAIT, MT_DATA);
1805 ifa_free(&ia->ia_ifa);
1811 * FUTURE: Consider increasing alignment by ETHER_HDR_LEN, so
1812 * that ether_output() does not need to allocate another mbuf
1813 * for the header in the most common case.
1815 MH_ALIGN(mh, sizeof(struct ip6_hdr));
1816 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
1817 mh->m_len = sizeof(struct ip6_hdr);
1819 ip6 = mtod(mh, struct ip6_hdr *);
1821 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
1822 ip6->ip6_vfc |= IPV6_VERSION;
1823 ip6->ip6_nxt = IPPROTO_ICMPV6;
1824 ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
1825 ip6->ip6_dst = in6m->in6m_addr;
1827 md->m_len = sizeof(struct mld_hdr);
1828 mld = mtod(md, struct mld_hdr *);
1829 mld->mld_type = type;
1832 mld->mld_maxdelay = 0;
1833 mld->mld_reserved = 0;
1834 mld->mld_addr = in6m->in6m_addr;
1835 in6_clearscope(&mld->mld_addr);
1836 mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
1837 sizeof(struct ip6_hdr), sizeof(struct mld_hdr));
1839 mld_save_context(mh, ifp);
1840 mh->m_flags |= M_MLDV1;
1842 mld_dispatch_packet(mh);
1845 ifa_free(&ia->ia_ifa);
1850 * Process a state change from the upper layer for the given IPv6 group.
1852 * Each socket holds a reference on the in_multi in its own ip_moptions.
1853 * The socket layer will have made the necessary updates to.the group
1854 * state, it is now up to MLD to issue a state change report if there
1855 * has been any change between T0 (when the last state-change was issued)
1858 * We use the MLDv2 state machine at group level. The MLd module
1859 * however makes the decision as to which MLD protocol version to speak.
1860 * A state change *from* INCLUDE {} always means an initial join.
1861 * A state change *to* INCLUDE {} always means a final leave.
1863 * If delay is non-zero, and the state change is an initial multicast
1864 * join, the state change report will be delayed by 'delay' ticks
1865 * in units of PR_FASTHZ if MLDv1 is active on the link; otherwise
1866 * the initial MLDv2 state change report will be delayed by whichever
1867 * is sooner, a pending state-change timer or delay itself.
1869 * VIMAGE: curvnet should have been set by caller, as this routine
1870 * is called from the socket option handlers.
1873 mld_change_state(struct in6_multi *inm, const int delay)
1875 struct mld_ifinfo *mli;
1879 IN6_MULTI_LOCK_ASSERT();
1884 * Try to detect if the upper layer just asked us to change state
1885 * for an interface which has now gone away.
1887 KASSERT(inm->in6m_ifma != NULL, ("%s: no ifma", __func__));
1888 ifp = inm->in6m_ifma->ifma_ifp;
1891 * Sanity check that netinet6's notion of ifp is the
1894 KASSERT(inm->in6m_ifp == ifp, ("%s: bad ifp", __func__));
1899 mli = MLD_IFINFO(ifp);
1900 KASSERT(mli != NULL, ("%s: no mld_ifinfo for ifp %p", __func__, ifp));
1903 * If we detect a state transition to or from MCAST_UNDEFINED
1904 * for this group, then we are starting or finishing an MLD
1905 * life cycle for this group.
1907 if (inm->in6m_st[1].iss_fmode != inm->in6m_st[0].iss_fmode) {
1908 CTR3(KTR_MLD, "%s: inm transition %d -> %d", __func__,
1909 inm->in6m_st[0].iss_fmode, inm->in6m_st[1].iss_fmode);
1910 if (inm->in6m_st[0].iss_fmode == MCAST_UNDEFINED) {
1911 CTR1(KTR_MLD, "%s: initial join", __func__);
1912 error = mld_initial_join(inm, mli, delay);
1914 } else if (inm->in6m_st[1].iss_fmode == MCAST_UNDEFINED) {
1915 CTR1(KTR_MLD, "%s: final leave", __func__);
1916 mld_final_leave(inm, mli);
1920 CTR1(KTR_MLD, "%s: filter set change", __func__);
1923 error = mld_handle_state_change(inm, mli);
1931 * Perform the initial join for an MLD group.
1933 * When joining a group:
1934 * If the group should have its MLD traffic suppressed, do nothing.
1935 * MLDv1 starts sending MLDv1 host membership reports.
1936 * MLDv2 will schedule an MLDv2 state-change report containing the
1937 * initial state of the membership.
1939 * If the delay argument is non-zero, then we must delay sending the
1940 * initial state change for delay ticks (in units of PR_FASTHZ).
1943 mld_initial_join(struct in6_multi *inm, struct mld_ifinfo *mli,
1947 struct ifqueue *ifq;
1948 int error, retval, syncstates;
1951 char ip6tbuf[INET6_ADDRSTRLEN];
1954 CTR4(KTR_MLD, "%s: initial join %s on ifp %p(%s)",
1955 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
1956 inm->in6m_ifp, inm->in6m_ifp->if_xname);
1961 ifp = inm->in6m_ifp;
1963 IN6_MULTI_LOCK_ASSERT();
1966 KASSERT(mli && mli->mli_ifp == ifp, ("%s: inconsistent ifp", __func__));
1969 * Groups joined on loopback or marked as 'not reported',
1970 * enter the MLD_SILENT_MEMBER state and
1971 * are never reported in any protocol exchanges.
1972 * All other groups enter the appropriate state machine
1973 * for the version in use on this link.
1974 * A link marked as MLIF_SILENT causes MLD to be completely
1975 * disabled for the link.
1977 if ((ifp->if_flags & IFF_LOOPBACK) ||
1978 (mli->mli_flags & MLIF_SILENT) ||
1979 !mld_is_addr_reported(&inm->in6m_addr)) {
1981 "%s: not kicking state machine for silent group", __func__);
1982 inm->in6m_state = MLD_SILENT_MEMBER;
1983 inm->in6m_timer = 0;
1986 * Deal with overlapping in_multi lifecycle.
1987 * If this group was LEAVING, then make sure
1988 * we drop the reference we picked up to keep the
1989 * group around for the final INCLUDE {} enqueue.
1991 if (mli->mli_version == MLD_VERSION_2 &&
1992 inm->in6m_state == MLD_LEAVING_MEMBER)
1993 in6m_release_locked(inm);
1995 inm->in6m_state = MLD_REPORTING_MEMBER;
1997 switch (mli->mli_version) {
2000 * If a delay was provided, only use it if
2001 * it is greater than the delay normally
2002 * used for an MLDv1 state change report,
2003 * and delay sending the initial MLDv1 report
2004 * by not transitioning to the IDLE state.
2006 odelay = MLD_RANDOM_DELAY(MLD_V1_MAX_RI * PR_FASTHZ);
2008 inm->in6m_timer = max(delay, odelay);
2009 V_current_state_timers_running6 = 1;
2011 inm->in6m_state = MLD_IDLE_MEMBER;
2012 error = mld_v1_transmit_report(inm,
2013 MLD_LISTENER_REPORT);
2015 inm->in6m_timer = odelay;
2016 V_current_state_timers_running6 = 1;
2023 * Defer update of T0 to T1, until the first copy
2024 * of the state change has been transmitted.
2029 * Immediately enqueue a State-Change Report for
2030 * this interface, freeing any previous reports.
2031 * Don't kick the timers if there is nothing to do,
2032 * or if an error occurred.
2034 ifq = &inm->in6m_scq;
2036 retval = mld_v2_enqueue_group_record(ifq, inm, 1,
2037 0, 0, (mli->mli_flags & MLIF_USEALLOW));
2038 CTR2(KTR_MLD, "%s: enqueue record = %d",
2041 error = retval * -1;
2046 * Schedule transmission of pending state-change
2047 * report up to RV times for this link. The timer
2048 * will fire at the next mld_fasttimo (~200ms),
2049 * giving us an opportunity to merge the reports.
2051 * If a delay was provided to this function, only
2052 * use this delay if sooner than the existing one.
2054 KASSERT(mli->mli_rv > 1,
2055 ("%s: invalid robustness %d", __func__,
2057 inm->in6m_scrv = mli->mli_rv;
2059 if (inm->in6m_sctimer > 1) {
2061 min(inm->in6m_sctimer, delay);
2063 inm->in6m_sctimer = delay;
2065 inm->in6m_sctimer = 1;
2066 V_state_change_timers_running6 = 1;
2074 * Only update the T0 state if state change is atomic,
2075 * i.e. we don't need to wait for a timer to fire before we
2076 * can consider the state change to have been communicated.
2080 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
2081 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2082 inm->in6m_ifp->if_xname);
2089 * Issue an intermediate state change during the life-cycle.
2092 mld_handle_state_change(struct in6_multi *inm, struct mld_ifinfo *mli)
2097 char ip6tbuf[INET6_ADDRSTRLEN];
2100 CTR4(KTR_MLD, "%s: state change for %s on ifp %p(%s)",
2101 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2102 inm->in6m_ifp, inm->in6m_ifp->if_xname);
2104 ifp = inm->in6m_ifp;
2106 IN6_MULTI_LOCK_ASSERT();
2109 KASSERT(mli && mli->mli_ifp == ifp,
2110 ("%s: inconsistent ifp", __func__));
2112 if ((ifp->if_flags & IFF_LOOPBACK) ||
2113 (mli->mli_flags & MLIF_SILENT) ||
2114 !mld_is_addr_reported(&inm->in6m_addr) ||
2115 (mli->mli_version != MLD_VERSION_2)) {
2116 if (!mld_is_addr_reported(&inm->in6m_addr)) {
2118 "%s: not kicking state machine for silent group", __func__);
2120 CTR1(KTR_MLD, "%s: nothing to do", __func__);
2122 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
2123 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2124 inm->in6m_ifp->if_xname);
2128 _IF_DRAIN(&inm->in6m_scq);
2130 retval = mld_v2_enqueue_group_record(&inm->in6m_scq, inm, 1, 0, 0,
2131 (mli->mli_flags & MLIF_USEALLOW));
2132 CTR2(KTR_MLD, "%s: enqueue record = %d", __func__, retval);
2137 * If record(s) were enqueued, start the state-change
2138 * report timer for this group.
2140 inm->in6m_scrv = mli->mli_rv;
2141 inm->in6m_sctimer = 1;
2142 V_state_change_timers_running6 = 1;
2148 * Perform the final leave for a multicast address.
2150 * When leaving a group:
2151 * MLDv1 sends a DONE message, if and only if we are the reporter.
2152 * MLDv2 enqueues a state-change report containing a transition
2153 * to INCLUDE {} for immediate transmission.
2156 mld_final_leave(struct in6_multi *inm, struct mld_ifinfo *mli)
2160 char ip6tbuf[INET6_ADDRSTRLEN];
2165 CTR4(KTR_MLD, "%s: final leave %s on ifp %p(%s)",
2166 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2167 inm->in6m_ifp, inm->in6m_ifp->if_xname);
2169 IN6_MULTI_LOCK_ASSERT();
2172 switch (inm->in6m_state) {
2173 case MLD_NOT_MEMBER:
2174 case MLD_SILENT_MEMBER:
2175 case MLD_LEAVING_MEMBER:
2176 /* Already leaving or left; do nothing. */
2178 "%s: not kicking state machine for silent group", __func__);
2180 case MLD_REPORTING_MEMBER:
2181 case MLD_IDLE_MEMBER:
2182 case MLD_G_QUERY_PENDING_MEMBER:
2183 case MLD_SG_QUERY_PENDING_MEMBER:
2184 if (mli->mli_version == MLD_VERSION_1) {
2186 if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER ||
2187 inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER)
2188 panic("%s: MLDv2 state reached, not MLDv2 mode",
2191 mld_v1_transmit_report(inm, MLD_LISTENER_DONE);
2192 inm->in6m_state = MLD_NOT_MEMBER;
2193 } else if (mli->mli_version == MLD_VERSION_2) {
2195 * Stop group timer and all pending reports.
2196 * Immediately enqueue a state-change report
2197 * TO_IN {} to be sent on the next fast timeout,
2198 * giving us an opportunity to merge reports.
2200 _IF_DRAIN(&inm->in6m_scq);
2201 inm->in6m_timer = 0;
2202 inm->in6m_scrv = mli->mli_rv;
2203 CTR4(KTR_MLD, "%s: Leaving %s/%s with %d "
2204 "pending retransmissions.", __func__,
2205 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2206 inm->in6m_ifp->if_xname, inm->in6m_scrv);
2207 if (inm->in6m_scrv == 0) {
2208 inm->in6m_state = MLD_NOT_MEMBER;
2209 inm->in6m_sctimer = 0;
2213 in6m_acquire_locked(inm);
2215 retval = mld_v2_enqueue_group_record(
2216 &inm->in6m_scq, inm, 1, 0, 0,
2217 (mli->mli_flags & MLIF_USEALLOW));
2218 KASSERT(retval != 0,
2219 ("%s: enqueue record = %d", __func__,
2222 inm->in6m_state = MLD_LEAVING_MEMBER;
2223 inm->in6m_sctimer = 1;
2224 V_state_change_timers_running6 = 1;
2230 case MLD_LAZY_MEMBER:
2231 case MLD_SLEEPING_MEMBER:
2232 case MLD_AWAKENING_MEMBER:
2233 /* Our reports are suppressed; do nothing. */
2239 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
2240 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2241 inm->in6m_ifp->if_xname);
2242 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
2243 CTR3(KTR_MLD, "%s: T1 now MCAST_UNDEFINED for %p/%s",
2244 __func__, &inm->in6m_addr, inm->in6m_ifp->if_xname);
2249 * Enqueue an MLDv2 group record to the given output queue.
2251 * If is_state_change is zero, a current-state record is appended.
2252 * If is_state_change is non-zero, a state-change report is appended.
2254 * If is_group_query is non-zero, an mbuf packet chain is allocated.
2255 * If is_group_query is zero, and if there is a packet with free space
2256 * at the tail of the queue, it will be appended to providing there
2257 * is enough free space.
2258 * Otherwise a new mbuf packet chain is allocated.
2260 * If is_source_query is non-zero, each source is checked to see if
2261 * it was recorded for a Group-Source query, and will be omitted if
2262 * it is not both in-mode and recorded.
2264 * If use_block_allow is non-zero, state change reports for initial join
2265 * and final leave, on an inclusive mode group with a source list, will be
2266 * rewritten to use the ALLOW_NEW and BLOCK_OLD record types, respectively.
2268 * The function will attempt to allocate leading space in the packet
2269 * for the IPv6+ICMP headers to be prepended without fragmenting the chain.
2271 * If successful the size of all data appended to the queue is returned,
2272 * otherwise an error code less than zero is returned, or zero if
2273 * no record(s) were appended.
2276 mld_v2_enqueue_group_record(struct ifqueue *ifq, struct in6_multi *inm,
2277 const int is_state_change, const int is_group_query,
2278 const int is_source_query, const int use_block_allow)
2280 struct mldv2_record mr;
2281 struct mldv2_record *pmr;
2283 struct ip6_msource *ims, *nims;
2284 struct mbuf *m0, *m, *md;
2285 int error, is_filter_list_change;
2286 int minrec0len, m0srcs, msrcs, nbytes, off;
2287 int record_has_sources;
2292 char ip6tbuf[INET6_ADDRSTRLEN];
2295 IN6_MULTI_LOCK_ASSERT();
2298 ifp = inm->in6m_ifp;
2299 is_filter_list_change = 0;
2306 record_has_sources = 1;
2308 type = MLD_DO_NOTHING;
2309 mode = inm->in6m_st[1].iss_fmode;
2312 * If we did not transition out of ASM mode during t0->t1,
2313 * and there are no source nodes to process, we can skip
2314 * the generation of source records.
2316 if (inm->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0 &&
2317 inm->in6m_nsrc == 0)
2318 record_has_sources = 0;
2320 if (is_state_change) {
2322 * Queue a state change record.
2323 * If the mode did not change, and there are non-ASM
2324 * listeners or source filters present,
2325 * we potentially need to issue two records for the group.
2326 * If there are ASM listeners, and there was no filter
2327 * mode transition of any kind, do nothing.
2329 * If we are transitioning to MCAST_UNDEFINED, we need
2330 * not send any sources. A transition to/from this state is
2331 * considered inclusive with some special treatment.
2333 * If we are rewriting initial joins/leaves to use
2334 * ALLOW/BLOCK, and the group's membership is inclusive,
2335 * we need to send sources in all cases.
2337 if (mode != inm->in6m_st[0].iss_fmode) {
2338 if (mode == MCAST_EXCLUDE) {
2339 CTR1(KTR_MLD, "%s: change to EXCLUDE",
2341 type = MLD_CHANGE_TO_EXCLUDE_MODE;
2343 CTR1(KTR_MLD, "%s: change to INCLUDE",
2345 if (use_block_allow) {
2348 * Here we're interested in state
2349 * edges either direction between
2350 * MCAST_UNDEFINED and MCAST_INCLUDE.
2351 * Perhaps we should just check
2352 * the group state, rather than
2355 if (mode == MCAST_UNDEFINED) {
2356 type = MLD_BLOCK_OLD_SOURCES;
2358 type = MLD_ALLOW_NEW_SOURCES;
2361 type = MLD_CHANGE_TO_INCLUDE_MODE;
2362 if (mode == MCAST_UNDEFINED)
2363 record_has_sources = 0;
2367 if (record_has_sources) {
2368 is_filter_list_change = 1;
2370 type = MLD_DO_NOTHING;
2375 * Queue a current state record.
2377 if (mode == MCAST_EXCLUDE) {
2378 type = MLD_MODE_IS_EXCLUDE;
2379 } else if (mode == MCAST_INCLUDE) {
2380 type = MLD_MODE_IS_INCLUDE;
2381 KASSERT(inm->in6m_st[1].iss_asm == 0,
2382 ("%s: inm %p is INCLUDE but ASM count is %d",
2383 __func__, inm, inm->in6m_st[1].iss_asm));
2388 * Generate the filter list changes using a separate function.
2390 if (is_filter_list_change)
2391 return (mld_v2_enqueue_filter_change(ifq, inm));
2393 if (type == MLD_DO_NOTHING) {
2394 CTR3(KTR_MLD, "%s: nothing to do for %s/%s",
2395 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2396 inm->in6m_ifp->if_xname);
2401 * If any sources are present, we must be able to fit at least
2402 * one in the trailing space of the tail packet's mbuf,
2405 minrec0len = sizeof(struct mldv2_record);
2406 if (record_has_sources)
2407 minrec0len += sizeof(struct in6_addr);
2409 CTR4(KTR_MLD, "%s: queueing %s for %s/%s", __func__,
2410 mld_rec_type_to_str(type),
2411 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2412 inm->in6m_ifp->if_xname);
2415 * Check if we have a packet in the tail of the queue for this
2416 * group into which the first group record for this group will fit.
2417 * Otherwise allocate a new packet.
2418 * Always allocate leading space for IP6+RA+ICMPV6+REPORT.
2419 * Note: Group records for G/GSR query responses MUST be sent
2420 * in their own packet.
2423 if (!is_group_query &&
2425 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= MLD_V2_REPORT_MAXRECS) &&
2426 (m0->m_pkthdr.len + minrec0len) <
2427 (ifp->if_mtu - MLD_MTUSPACE)) {
2428 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
2429 sizeof(struct mldv2_record)) /
2430 sizeof(struct in6_addr);
2432 CTR1(KTR_MLD, "%s: use existing packet", __func__);
2434 if (_IF_QFULL(ifq)) {
2435 CTR1(KTR_MLD, "%s: outbound queue full", __func__);
2439 m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
2440 sizeof(struct mldv2_record)) / sizeof(struct in6_addr);
2441 if (!is_state_change && !is_group_query)
2442 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
2444 m = m_gethdr(M_DONTWAIT, MT_DATA);
2448 mld_save_context(m, ifp);
2450 CTR1(KTR_MLD, "%s: allocated first packet", __func__);
2454 * Append group record.
2455 * If we have sources, we don't know how many yet.
2460 mr.mr_addr = inm->in6m_addr;
2461 in6_clearscope(&mr.mr_addr);
2462 if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) {
2465 CTR1(KTR_MLD, "%s: m_append() failed.", __func__);
2468 nbytes += sizeof(struct mldv2_record);
2471 * Append as many sources as will fit in the first packet.
2472 * If we are appending to a new packet, the chain allocation
2473 * may potentially use clusters; use m_getptr() in this case.
2474 * If we are appending to an existing packet, we need to obtain
2475 * a pointer to the group record after m_append(), in case a new
2476 * mbuf was allocated.
2478 * Only append sources which are in-mode at t1. If we are
2479 * transitioning to MCAST_UNDEFINED state on the group, and
2480 * use_block_allow is zero, do not include source entries.
2481 * Otherwise, we need to include this source in the report.
2483 * Only report recorded sources in our filter set when responding
2484 * to a group-source query.
2486 if (record_has_sources) {
2489 pmr = (struct mldv2_record *)(mtod(md, uint8_t *) +
2490 md->m_len - nbytes);
2492 md = m_getptr(m, 0, &off);
2493 pmr = (struct mldv2_record *)(mtod(md, uint8_t *) +
2497 RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs,
2499 CTR2(KTR_MLD, "%s: visit node %s", __func__,
2500 ip6_sprintf(ip6tbuf, &ims->im6s_addr));
2501 now = im6s_get_mode(inm, ims, 1);
2502 CTR2(KTR_MLD, "%s: node is %d", __func__, now);
2503 if ((now != mode) ||
2505 (!use_block_allow && mode == MCAST_UNDEFINED))) {
2506 CTR1(KTR_MLD, "%s: skip node", __func__);
2509 if (is_source_query && ims->im6s_stp == 0) {
2510 CTR1(KTR_MLD, "%s: skip unrecorded node",
2514 CTR1(KTR_MLD, "%s: append node", __func__);
2515 if (!m_append(m, sizeof(struct in6_addr),
2516 (void *)&ims->im6s_addr)) {
2519 CTR1(KTR_MLD, "%s: m_append() failed.",
2523 nbytes += sizeof(struct in6_addr);
2525 if (msrcs == m0srcs)
2528 CTR2(KTR_MLD, "%s: msrcs is %d this packet", __func__,
2530 pmr->mr_numsrc = htons(msrcs);
2531 nbytes += (msrcs * sizeof(struct in6_addr));
2534 if (is_source_query && msrcs == 0) {
2535 CTR1(KTR_MLD, "%s: no recorded sources to report", __func__);
2542 * We are good to go with first packet.
2545 CTR1(KTR_MLD, "%s: enqueueing first packet", __func__);
2546 m->m_pkthdr.PH_vt.vt_nrecs = 1;
2547 _IF_ENQUEUE(ifq, m);
2549 m->m_pkthdr.PH_vt.vt_nrecs++;
2552 * No further work needed if no source list in packet(s).
2554 if (!record_has_sources)
2558 * Whilst sources remain to be announced, we need to allocate
2559 * a new packet and fill out as many sources as will fit.
2560 * Always try for a cluster first.
2562 while (nims != NULL) {
2563 if (_IF_QFULL(ifq)) {
2564 CTR1(KTR_MLD, "%s: outbound queue full", __func__);
2567 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
2569 m = m_gethdr(M_DONTWAIT, MT_DATA);
2572 mld_save_context(m, ifp);
2573 md = m_getptr(m, 0, &off);
2574 pmr = (struct mldv2_record *)(mtod(md, uint8_t *) + off);
2575 CTR1(KTR_MLD, "%s: allocated next packet", __func__);
2577 if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) {
2580 CTR1(KTR_MLD, "%s: m_append() failed.", __func__);
2583 m->m_pkthdr.PH_vt.vt_nrecs = 1;
2584 nbytes += sizeof(struct mldv2_record);
2586 m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
2587 sizeof(struct mldv2_record)) / sizeof(struct in6_addr);
2590 RB_FOREACH_FROM(ims, ip6_msource_tree, nims) {
2591 CTR2(KTR_MLD, "%s: visit node %s",
2592 __func__, ip6_sprintf(ip6tbuf, &ims->im6s_addr));
2593 now = im6s_get_mode(inm, ims, 1);
2594 if ((now != mode) ||
2596 (!use_block_allow && mode == MCAST_UNDEFINED))) {
2597 CTR1(KTR_MLD, "%s: skip node", __func__);
2600 if (is_source_query && ims->im6s_stp == 0) {
2601 CTR1(KTR_MLD, "%s: skip unrecorded node",
2605 CTR1(KTR_MLD, "%s: append node", __func__);
2606 if (!m_append(m, sizeof(struct in6_addr),
2607 (void *)&ims->im6s_addr)) {
2610 CTR1(KTR_MLD, "%s: m_append() failed.",
2615 if (msrcs == m0srcs)
2618 pmr->mr_numsrc = htons(msrcs);
2619 nbytes += (msrcs * sizeof(struct in6_addr));
2621 CTR1(KTR_MLD, "%s: enqueueing next packet", __func__);
2622 _IF_ENQUEUE(ifq, m);
2629 * Type used to mark record pass completion.
2630 * We exploit the fact we can cast to this easily from the
2631 * current filter modes on each ip_msource node.
2634 REC_NONE = 0x00, /* MCAST_UNDEFINED */
2635 REC_ALLOW = 0x01, /* MCAST_INCLUDE */
2636 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */
2637 REC_FULL = REC_ALLOW | REC_BLOCK
2641 * Enqueue an MLDv2 filter list change to the given output queue.
2643 * Source list filter state is held in an RB-tree. When the filter list
2644 * for a group is changed without changing its mode, we need to compute
2645 * the deltas between T0 and T1 for each source in the filter set,
2646 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records.
2648 * As we may potentially queue two record types, and the entire R-B tree
2649 * needs to be walked at once, we break this out into its own function
2650 * so we can generate a tightly packed queue of packets.
2652 * XXX This could be written to only use one tree walk, although that makes
2653 * serializing into the mbuf chains a bit harder. For now we do two walks
2654 * which makes things easier on us, and it may or may not be harder on
2657 * If successful the size of all data appended to the queue is returned,
2658 * otherwise an error code less than zero is returned, or zero if
2659 * no record(s) were appended.
2662 mld_v2_enqueue_filter_change(struct ifqueue *ifq, struct in6_multi *inm)
2664 static const int MINRECLEN =
2665 sizeof(struct mldv2_record) + sizeof(struct in6_addr);
2667 struct mldv2_record mr;
2668 struct mldv2_record *pmr;
2669 struct ip6_msource *ims, *nims;
2670 struct mbuf *m, *m0, *md;
2671 int m0srcs, nbytes, npbytes, off, rsrcs, schanged;
2673 uint8_t mode, now, then;
2674 rectype_t crt, drt, nrt;
2676 char ip6tbuf[INET6_ADDRSTRLEN];
2679 IN6_MULTI_LOCK_ASSERT();
2681 if (inm->in6m_nsrc == 0 ||
2682 (inm->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0))
2685 ifp = inm->in6m_ifp; /* interface */
2686 mode = inm->in6m_st[1].iss_fmode; /* filter mode at t1 */
2687 crt = REC_NONE; /* current group record type */
2688 drt = REC_NONE; /* mask of completed group record types */
2689 nrt = REC_NONE; /* record type for current node */
2690 m0srcs = 0; /* # source which will fit in current mbuf chain */
2691 npbytes = 0; /* # of bytes appended this packet */
2692 nbytes = 0; /* # of bytes appended to group's state-change queue */
2693 rsrcs = 0; /* # sources encoded in current record */
2694 schanged = 0; /* # nodes encoded in overall filter change */
2695 nallow = 0; /* # of source entries in ALLOW_NEW */
2696 nblock = 0; /* # of source entries in BLOCK_OLD */
2697 nims = NULL; /* next tree node pointer */
2700 * For each possible filter record mode.
2701 * The first kind of source we encounter tells us which
2702 * is the first kind of record we start appending.
2703 * If a node transitioned to UNDEFINED at t1, its mode is treated
2704 * as the inverse of the group's filter mode.
2706 while (drt != REC_FULL) {
2710 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <=
2711 MLD_V2_REPORT_MAXRECS) &&
2712 (m0->m_pkthdr.len + MINRECLEN) <
2713 (ifp->if_mtu - MLD_MTUSPACE)) {
2715 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
2716 sizeof(struct mldv2_record)) /
2717 sizeof(struct in6_addr);
2719 "%s: use previous packet", __func__);
2721 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
2723 m = m_gethdr(M_DONTWAIT, MT_DATA);
2726 "%s: m_get*() failed", __func__);
2729 m->m_pkthdr.PH_vt.vt_nrecs = 0;
2730 mld_save_context(m, ifp);
2731 m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
2732 sizeof(struct mldv2_record)) /
2733 sizeof(struct in6_addr);
2736 "%s: allocated new packet", __func__);
2739 * Append the MLD group record header to the
2740 * current packet's data area.
2741 * Recalculate pointer to free space for next
2742 * group record, in case m_append() allocated
2743 * a new mbuf or cluster.
2745 memset(&mr, 0, sizeof(mr));
2746 mr.mr_addr = inm->in6m_addr;
2747 in6_clearscope(&mr.mr_addr);
2748 if (!m_append(m, sizeof(mr), (void *)&mr)) {
2752 "%s: m_append() failed", __func__);
2755 npbytes += sizeof(struct mldv2_record);
2757 /* new packet; offset in chain */
2758 md = m_getptr(m, npbytes -
2759 sizeof(struct mldv2_record), &off);
2760 pmr = (struct mldv2_record *)(mtod(md,
2763 /* current packet; offset from last append */
2765 pmr = (struct mldv2_record *)(mtod(md,
2766 uint8_t *) + md->m_len -
2767 sizeof(struct mldv2_record));
2770 * Begin walking the tree for this record type
2771 * pass, or continue from where we left off
2772 * previously if we had to allocate a new packet.
2773 * Only report deltas in-mode at t1.
2774 * We need not report included sources as allowed
2775 * if we are in inclusive mode on the group,
2776 * however the converse is not true.
2780 nims = RB_MIN(ip6_msource_tree,
2783 RB_FOREACH_FROM(ims, ip6_msource_tree, nims) {
2784 CTR2(KTR_MLD, "%s: visit node %s", __func__,
2785 ip6_sprintf(ip6tbuf, &ims->im6s_addr));
2786 now = im6s_get_mode(inm, ims, 1);
2787 then = im6s_get_mode(inm, ims, 0);
2788 CTR3(KTR_MLD, "%s: mode: t0 %d, t1 %d",
2789 __func__, then, now);
2792 "%s: skip unchanged", __func__);
2795 if (mode == MCAST_EXCLUDE &&
2796 now == MCAST_INCLUDE) {
2798 "%s: skip IN src on EX group",
2802 nrt = (rectype_t)now;
2803 if (nrt == REC_NONE)
2804 nrt = (rectype_t)(~mode & REC_FULL);
2805 if (schanged++ == 0) {
2807 } else if (crt != nrt)
2809 if (!m_append(m, sizeof(struct in6_addr),
2810 (void *)&ims->im6s_addr)) {
2814 "%s: m_append() failed", __func__);
2817 nallow += !!(crt == REC_ALLOW);
2818 nblock += !!(crt == REC_BLOCK);
2819 if (++rsrcs == m0srcs)
2823 * If we did not append any tree nodes on this
2824 * pass, back out of allocations.
2827 npbytes -= sizeof(struct mldv2_record);
2830 "%s: m_free(m)", __func__);
2834 "%s: m_adj(m, -mr)", __func__);
2835 m_adj(m, -((int)sizeof(
2836 struct mldv2_record)));
2840 npbytes += (rsrcs * sizeof(struct in6_addr));
2841 if (crt == REC_ALLOW)
2842 pmr->mr_type = MLD_ALLOW_NEW_SOURCES;
2843 else if (crt == REC_BLOCK)
2844 pmr->mr_type = MLD_BLOCK_OLD_SOURCES;
2845 pmr->mr_numsrc = htons(rsrcs);
2847 * Count the new group record, and enqueue this
2848 * packet if it wasn't already queued.
2850 m->m_pkthdr.PH_vt.vt_nrecs++;
2852 _IF_ENQUEUE(ifq, m);
2854 } while (nims != NULL);
2856 crt = (~crt & REC_FULL);
2859 CTR3(KTR_MLD, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__,
2866 mld_v2_merge_state_changes(struct in6_multi *inm, struct ifqueue *ifscq)
2869 struct mbuf *m; /* pending state-change */
2870 struct mbuf *m0; /* copy of pending state-change */
2871 struct mbuf *mt; /* last state-change in packet */
2872 int docopy, domerge;
2879 IN6_MULTI_LOCK_ASSERT();
2883 * If there are further pending retransmissions, make a writable
2884 * copy of each queued state-change message before merging.
2886 if (inm->in6m_scrv > 0)
2889 gq = &inm->in6m_scq;
2891 if (gq->ifq_head == NULL) {
2892 CTR2(KTR_MLD, "%s: WARNING: queue for inm %p is empty",
2900 * Only merge the report into the current packet if
2901 * there is sufficient space to do so; an MLDv2 report
2902 * packet may only contain 65,535 group records.
2903 * Always use a simple mbuf chain concatentation to do this,
2904 * as large state changes for single groups may have
2905 * allocated clusters.
2908 mt = ifscq->ifq_tail;
2910 recslen = m_length(m, NULL);
2912 if ((mt->m_pkthdr.PH_vt.vt_nrecs +
2913 m->m_pkthdr.PH_vt.vt_nrecs <=
2914 MLD_V2_REPORT_MAXRECS) &&
2915 (mt->m_pkthdr.len + recslen <=
2916 (inm->in6m_ifp->if_mtu - MLD_MTUSPACE)))
2920 if (!domerge && _IF_QFULL(gq)) {
2922 "%s: outbound queue full, skipping whole packet %p",
2932 CTR2(KTR_MLD, "%s: dequeueing %p", __func__, m);
2933 _IF_DEQUEUE(gq, m0);
2936 CTR2(KTR_MLD, "%s: copying %p", __func__, m);
2937 m0 = m_dup(m, M_NOWAIT);
2940 m0->m_nextpkt = NULL;
2945 CTR3(KTR_MLD, "%s: queueing %p to ifscq %p)",
2946 __func__, m0, ifscq);
2947 _IF_ENQUEUE(ifscq, m0);
2949 struct mbuf *mtl; /* last mbuf of packet mt */
2951 CTR3(KTR_MLD, "%s: merging %p with ifscq tail %p)",
2955 m0->m_flags &= ~M_PKTHDR;
2956 mt->m_pkthdr.len += recslen;
2957 mt->m_pkthdr.PH_vt.vt_nrecs +=
2958 m0->m_pkthdr.PH_vt.vt_nrecs;
2968 * Respond to a pending MLDv2 General Query.
2971 mld_v2_dispatch_general_query(struct mld_ifinfo *mli)
2973 struct ifmultiaddr *ifma, *tifma;
2975 struct in6_multi *inm;
2978 IN6_MULTI_LOCK_ASSERT();
2981 KASSERT(mli->mli_version == MLD_VERSION_2,
2982 ("%s: called when version %d", __func__, mli->mli_version));
2987 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, tifma) {
2988 if (ifma->ifma_addr->sa_family != AF_INET6 ||
2989 ifma->ifma_protospec == NULL)
2992 inm = (struct in6_multi *)ifma->ifma_protospec;
2993 KASSERT(ifp == inm->in6m_ifp,
2994 ("%s: inconsistent ifp", __func__));
2996 switch (inm->in6m_state) {
2997 case MLD_NOT_MEMBER:
2998 case MLD_SILENT_MEMBER:
3000 case MLD_REPORTING_MEMBER:
3001 case MLD_IDLE_MEMBER:
3002 case MLD_LAZY_MEMBER:
3003 case MLD_SLEEPING_MEMBER:
3004 case MLD_AWAKENING_MEMBER:
3005 inm->in6m_state = MLD_REPORTING_MEMBER;
3006 retval = mld_v2_enqueue_group_record(&mli->mli_gq,
3008 CTR2(KTR_MLD, "%s: enqueue record = %d",
3011 case MLD_G_QUERY_PENDING_MEMBER:
3012 case MLD_SG_QUERY_PENDING_MEMBER:
3013 case MLD_LEAVING_MEMBER:
3017 IF_ADDR_UNLOCK(ifp);
3019 mld_dispatch_queue(&mli->mli_gq, MLD_MAX_RESPONSE_BURST);
3022 * Slew transmission of bursts over 500ms intervals.
3024 if (mli->mli_gq.ifq_head != NULL) {
3025 mli->mli_v2_timer = 1 + MLD_RANDOM_DELAY(
3026 MLD_RESPONSE_BURST_INTERVAL);
3027 V_interface_timers_running6 = 1;
3032 * Transmit the next pending message in the output queue.
3034 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis.
3035 * MRT: Nothing needs to be done, as MLD traffic is always local to
3036 * a link and uses a link-scope multicast address.
3039 mld_dispatch_packet(struct mbuf *m)
3041 struct ip6_moptions im6o;
3046 struct ip6_hdr *ip6;
3047 struct mld_hdr *mld;
3053 CTR2(KTR_MLD, "%s: transmit %p", __func__, m);
3056 * Set VNET image pointer from enqueued mbuf chain
3057 * before doing anything else. Whilst we use interface
3058 * indexes to guard against interface detach, they are
3059 * unique to each VIMAGE and must be retrieved.
3061 ifindex = mld_restore_context(m);
3064 * Check if the ifnet still exists. This limits the scope of
3065 * any race in the absence of a global ifp lock for low cost
3066 * (an array lookup).
3068 ifp = ifnet_byindex(ifindex);
3070 CTR3(KTR_MLD, "%s: dropped %p as ifindex %u went away.",
3071 __func__, m, ifindex);
3073 IP6STAT_INC(ip6s_noroute);
3077 im6o.im6o_multicast_hlim = 1;
3078 im6o.im6o_multicast_loop = (V_ip6_mrouter != NULL);
3079 im6o.im6o_multicast_ifp = ifp;
3081 if (m->m_flags & M_MLDV1) {
3084 m0 = mld_v2_encap_report(ifp, m);
3086 CTR2(KTR_MLD, "%s: dropped %p", __func__, m);
3088 IP6STAT_INC(ip6s_odropped);
3093 mld_scrub_context(m0);
3094 m->m_flags &= ~(M_PROTOFLAGS);
3095 m0->m_pkthdr.rcvif = V_loif;
3097 ip6 = mtod(m0, struct ip6_hdr *);
3099 (void)in6_setscope(&ip6->ip6_dst, ifp, NULL); /* XXX LOR */
3102 * XXX XXX Break some KPI rules to prevent an LOR which would
3103 * occur if we called in6_setscope() at transmission.
3104 * See comments at top of file.
3106 MLD_EMBEDSCOPE(&ip6->ip6_dst, ifp->if_index);
3110 * Retrieve the ICMPv6 type before handoff to ip6_output(),
3111 * so we can bump the stats.
3113 md = m_getptr(m0, sizeof(struct ip6_hdr), &off);
3114 mld = (struct mld_hdr *)(mtod(md, uint8_t *) + off);
3115 type = mld->mld_type;
3117 error = ip6_output(m0, &mld_po, NULL, IPV6_UNSPECSRC, &im6o,
3120 CTR3(KTR_MLD, "%s: ip6_output(%p) = %d", __func__, m0, error);
3123 ICMP6STAT_INC(icp6s_outhist[type]);
3125 icmp6_ifstat_inc(oifp, ifs6_out_msg);
3127 case MLD_LISTENER_REPORT:
3128 case MLDV2_LISTENER_REPORT:
3129 icmp6_ifstat_inc(oifp, ifs6_out_mldreport);
3131 case MLD_LISTENER_DONE:
3132 icmp6_ifstat_inc(oifp, ifs6_out_mlddone);
3141 * Encapsulate an MLDv2 report.
3143 * KAME IPv6 requires that hop-by-hop options be passed separately,
3144 * and that the IPv6 header be prepended in a separate mbuf.
3146 * Returns a pointer to the new mbuf chain head, or NULL if the
3147 * allocation failed.
3149 static struct mbuf *
3150 mld_v2_encap_report(struct ifnet *ifp, struct mbuf *m)
3153 struct mldv2_report *mld;
3154 struct ip6_hdr *ip6;
3155 struct in6_ifaddr *ia;
3158 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
3159 KASSERT((m->m_flags & M_PKTHDR),
3160 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m));
3163 * RFC3590: OK to send as :: or tentative during DAD.
3165 ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
3167 CTR1(KTR_MLD, "%s: warning: ia is NULL", __func__);
3169 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
3172 ifa_free(&ia->ia_ifa);
3176 MH_ALIGN(mh, sizeof(struct ip6_hdr) + sizeof(struct mldv2_report));
3178 mldreclen = m_length(m, NULL);
3179 CTR2(KTR_MLD, "%s: mldreclen is %d", __func__, mldreclen);
3181 mh->m_len = sizeof(struct ip6_hdr) + sizeof(struct mldv2_report);
3182 mh->m_pkthdr.len = sizeof(struct ip6_hdr) +
3183 sizeof(struct mldv2_report) + mldreclen;
3185 ip6 = mtod(mh, struct ip6_hdr *);
3187 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
3188 ip6->ip6_vfc |= IPV6_VERSION;
3189 ip6->ip6_nxt = IPPROTO_ICMPV6;
3190 ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
3192 ifa_free(&ia->ia_ifa);
3193 ip6->ip6_dst = in6addr_linklocal_allv2routers;
3194 /* scope ID will be set in netisr */
3196 mld = (struct mldv2_report *)(ip6 + 1);
3197 mld->mld_type = MLDV2_LISTENER_REPORT;
3200 mld->mld_v2_reserved = 0;
3201 mld->mld_v2_numrecs = htons(m->m_pkthdr.PH_vt.vt_nrecs);
3202 m->m_pkthdr.PH_vt.vt_nrecs = 0;
3205 mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
3206 sizeof(struct ip6_hdr), sizeof(struct mldv2_report) + mldreclen);
3212 mld_rec_type_to_str(const int type)
3216 case MLD_CHANGE_TO_EXCLUDE_MODE:
3219 case MLD_CHANGE_TO_INCLUDE_MODE:
3222 case MLD_MODE_IS_EXCLUDE:
3225 case MLD_MODE_IS_INCLUDE:
3228 case MLD_ALLOW_NEW_SOURCES:
3231 case MLD_BLOCK_OLD_SOURCES:
3242 mld_init(void *unused __unused)
3245 CTR1(KTR_MLD, "%s: initializing", __func__);
3248 ip6_initpktopts(&mld_po);
3249 mld_po.ip6po_hlim = 1;
3250 mld_po.ip6po_hbh = &mld_ra.hbh;
3251 mld_po.ip6po_prefer_tempaddr = IP6PO_TEMPADDR_NOTPREFER;
3252 mld_po.ip6po_flags = IP6PO_DONTFRAG;
3254 SYSINIT(mld_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, mld_init, NULL);
3257 mld_uninit(void *unused __unused)
3260 CTR1(KTR_MLD, "%s: tearing down", __func__);
3263 SYSUNINIT(mld_uninit, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, mld_uninit, NULL);
3266 vnet_mld_init(const void *unused __unused)
3269 CTR1(KTR_MLD, "%s: initializing", __func__);
3271 LIST_INIT(&V_mli_head);
3273 VNET_SYSINIT(vnet_mld_init, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mld_init,
3277 vnet_mld_uninit(const void *unused __unused)
3280 CTR1(KTR_MLD, "%s: tearing down", __func__);
3282 KASSERT(LIST_EMPTY(&V_mli_head),
3283 ("%s: mli list not empty; ifnets not detached?", __func__));
3285 VNET_SYSUNINIT(vnet_mld_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_mld_uninit,
3289 mld_modevent(module_t mod, int type, void *unused __unused)
3297 return (EOPNOTSUPP);
3302 static moduledata_t mld_mod = {
3307 DECLARE_MODULE(mld, mld_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);