2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2009 Bruce Simpson.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote
15 * products derived from this software without specific prior written
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * $KAME: mld6.c,v 1.27 2001/04/04 05:17:30 itojun Exp $
34 * Copyright (c) 1988 Stephen Deering.
35 * Copyright (c) 1992, 1993
36 * The Regents of the University of California. All rights reserved.
38 * This code is derived from software contributed to Berkeley by
39 * Stephen Deering of Stanford University.
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * @(#)igmp.c 8.1 (Berkeley) 7/19/93
68 #include <sys/cdefs.h>
69 __FBSDID("$FreeBSD$");
72 #include "opt_inet6.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
77 #include <sys/socket.h>
78 #include <sys/protosw.h>
79 #include <sys/sysctl.h>
80 #include <sys/kernel.h>
81 #include <sys/callout.h>
82 #include <sys/malloc.h>
83 #include <sys/module.h>
87 #include <net/if_var.h>
88 #include <net/route.h>
91 #include <netinet/in.h>
92 #include <netinet/in_var.h>
93 #include <netinet6/in6_var.h>
94 #include <netinet/ip6.h>
95 #include <netinet6/ip6_var.h>
96 #include <netinet6/scope6_var.h>
97 #include <netinet/icmp6.h>
98 #include <netinet6/mld6.h>
99 #include <netinet6/mld6_var.h>
101 #include <security/mac/mac_framework.h>
104 #define KTR_MLD KTR_INET6
107 static struct mld_ifsoftc *
108 mli_alloc_locked(struct ifnet *);
109 static void mli_delete_locked(const struct ifnet *);
110 static void mld_dispatch_packet(struct mbuf *);
111 static void mld_dispatch_queue(struct mbufq *, int);
112 static void mld_final_leave(struct in6_multi *, struct mld_ifsoftc *);
113 static void mld_fasttimo_vnet(struct in6_multi_head *inmh);
114 static int mld_handle_state_change(struct in6_multi *,
115 struct mld_ifsoftc *);
116 static int mld_initial_join(struct in6_multi *, struct mld_ifsoftc *,
119 static char * mld_rec_type_to_str(const int);
121 static void mld_set_version(struct mld_ifsoftc *, const int);
122 static void mld_slowtimo_vnet(void);
123 static int mld_v1_input_query(struct ifnet *, const struct ip6_hdr *,
124 /*const*/ struct mld_hdr *);
125 static int mld_v1_input_report(struct ifnet *, const struct ip6_hdr *,
126 /*const*/ struct mld_hdr *);
127 static void mld_v1_process_group_timer(struct in6_multi_head *,
129 static void mld_v1_process_querier_timers(struct mld_ifsoftc *);
130 static int mld_v1_transmit_report(struct in6_multi *, const int);
131 static void mld_v1_update_group(struct in6_multi *, const int);
132 static void mld_v2_cancel_link_timers(struct mld_ifsoftc *);
133 static void mld_v2_dispatch_general_query(struct mld_ifsoftc *);
135 mld_v2_encap_report(struct ifnet *, struct mbuf *);
136 static int mld_v2_enqueue_filter_change(struct mbufq *,
138 static int mld_v2_enqueue_group_record(struct mbufq *,
139 struct in6_multi *, const int, const int, const int,
141 static int mld_v2_input_query(struct ifnet *, const struct ip6_hdr *,
142 struct mbuf *, struct mldv2_query *, const int, const int);
143 static int mld_v2_merge_state_changes(struct in6_multi *,
145 static void mld_v2_process_group_timers(struct in6_multi_head *,
146 struct mbufq *, struct mbufq *,
147 struct in6_multi *, const int);
148 static int mld_v2_process_group_query(struct in6_multi *,
149 struct mld_ifsoftc *mli, int, struct mbuf *,
150 struct mldv2_query *, const int);
151 static int sysctl_mld_gsr(SYSCTL_HANDLER_ARGS);
152 static int sysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS);
155 * Normative references: RFC 2710, RFC 3590, RFC 3810.
158 * * The MLD subsystem lock ends up being system-wide for the moment,
159 * but could be per-VIMAGE later on.
160 * * The permitted lock order is: IN6_MULTI_LOCK, MLD_LOCK, IF_ADDR_LOCK.
161 * Any may be taken independently; if any are held at the same
162 * time, the above lock order must be followed.
163 * * IN6_MULTI_LOCK covers in_multi.
164 * * MLD_LOCK covers per-link state and any global variables in this file.
165 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of
166 * per-link state iterators.
169 * A special case for IPv6 is the in6_setscope() routine. ip6_output()
170 * will not accept an ifp; it wants an embedded scope ID, unlike
171 * ip_output(), which happily takes the ifp given to it. The embedded
172 * scope ID is only used by MLD to select the outgoing interface.
174 * During interface attach and detach, MLD will take MLD_LOCK *after*
175 * the IF_AFDATA_LOCK.
176 * As in6_setscope() takes IF_AFDATA_LOCK then SCOPE_LOCK, we can't call
177 * it with MLD_LOCK held without triggering an LOR. A netisr with indirect
178 * dispatch could work around this, but we'd rather not do that, as it
179 * can introduce other races.
181 * As such, we exploit the fact that the scope ID is just the interface
182 * index, and embed it in the IPv6 destination address accordingly.
183 * This is potentially NOT VALID for MLDv1 reports, as they
184 * are always sent to the multicast group itself; as MLDv2
185 * reports are always sent to ff02::16, this is not an issue
186 * when MLDv2 is in use.
188 * This does not however eliminate the LOR when ip6_output() itself
189 * calls in6_setscope() internally whilst MLD_LOCK is held. This will
190 * trigger a LOR warning in WITNESS when the ifnet is detached.
192 * The right answer is probably to make IF_AFDATA_LOCK an rwlock, given
193 * how it's used across the network stack. Here we're simply exploiting
194 * the fact that MLD runs at a similar layer in the stack to scope6.c.
197 * * Each in6_multi corresponds to an ifp, and each ifp corresponds
198 * to a vnet in ifp->if_vnet.
200 static struct mtx mld_mtx;
201 static MALLOC_DEFINE(M_MLD, "mld", "mld state");
203 #define MLD_EMBEDSCOPE(pin6, zoneid) \
204 if (IN6_IS_SCOPE_LINKLOCAL(pin6) || \
205 IN6_IS_ADDR_MC_INTFACELOCAL(pin6)) \
206 (pin6)->s6_addr16[1] = htons((zoneid) & 0xFFFF) \
209 * VIMAGE-wide globals.
211 VNET_DEFINE_STATIC(struct timeval, mld_gsrdelay) = {10, 0};
212 VNET_DEFINE_STATIC(LIST_HEAD(, mld_ifsoftc), mli_head);
213 VNET_DEFINE_STATIC(int, interface_timers_running6);
214 VNET_DEFINE_STATIC(int, state_change_timers_running6);
215 VNET_DEFINE_STATIC(int, current_state_timers_running6);
217 #define V_mld_gsrdelay VNET(mld_gsrdelay)
218 #define V_mli_head VNET(mli_head)
219 #define V_interface_timers_running6 VNET(interface_timers_running6)
220 #define V_state_change_timers_running6 VNET(state_change_timers_running6)
221 #define V_current_state_timers_running6 VNET(current_state_timers_running6)
223 SYSCTL_DECL(_net_inet6); /* Note: Not in any common header. */
225 SYSCTL_NODE(_net_inet6, OID_AUTO, mld, CTLFLAG_RW, 0,
226 "IPv6 Multicast Listener Discovery");
229 * Virtualized sysctls.
231 SYSCTL_PROC(_net_inet6_mld, OID_AUTO, gsrdelay,
232 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
233 &VNET_NAME(mld_gsrdelay.tv_sec), 0, sysctl_mld_gsr, "I",
234 "Rate limit for MLDv2 Group-and-Source queries in seconds");
237 * Non-virtualized sysctls.
239 static SYSCTL_NODE(_net_inet6_mld, OID_AUTO, ifinfo,
240 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_mld_ifinfo,
241 "Per-interface MLDv2 state");
243 static int mld_v1enable = 1;
244 SYSCTL_INT(_net_inet6_mld, OID_AUTO, v1enable, CTLFLAG_RWTUN,
245 &mld_v1enable, 0, "Enable fallback to MLDv1");
247 static int mld_v2enable = 1;
248 SYSCTL_INT(_net_inet6_mld, OID_AUTO, v2enable, CTLFLAG_RWTUN,
249 &mld_v2enable, 0, "Enable MLDv2");
251 static int mld_use_allow = 1;
252 SYSCTL_INT(_net_inet6_mld, OID_AUTO, use_allow, CTLFLAG_RWTUN,
253 &mld_use_allow, 0, "Use ALLOW/BLOCK for RFC 4604 SSM joins/leaves");
256 * Packed Router Alert option structure declaration.
261 struct ip6_opt_router ra;
265 * Router Alert hop-by-hop option header.
267 static struct mld_raopt mld_ra = {
269 .pad = { .ip6o_type = IP6OPT_PADN, 0 },
271 .ip6or_type = IP6OPT_ROUTER_ALERT,
272 .ip6or_len = IP6OPT_RTALERT_LEN - 2,
273 .ip6or_value[0] = ((IP6OPT_RTALERT_MLD >> 8) & 0xFF),
274 .ip6or_value[1] = (IP6OPT_RTALERT_MLD & 0xFF)
277 static struct ip6_pktopts mld_po;
280 mld_save_context(struct mbuf *m, struct ifnet *ifp)
284 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet;
286 m->m_pkthdr.flowid = ifp->if_index;
290 mld_scrub_context(struct mbuf *m)
293 m->m_pkthdr.PH_loc.ptr = NULL;
294 m->m_pkthdr.flowid = 0;
298 * Restore context from a queued output chain.
299 * Return saved ifindex.
301 * VIMAGE: The assertion is there to make sure that we
302 * actually called CURVNET_SET() with what's in the mbuf chain.
304 static __inline uint32_t
305 mld_restore_context(struct mbuf *m)
308 #if defined(VIMAGE) && defined(INVARIANTS)
309 KASSERT(curvnet == m->m_pkthdr.PH_loc.ptr,
310 ("%s: called when curvnet was not restored: cuvnet %p m ptr %p",
311 __func__, curvnet, m->m_pkthdr.PH_loc.ptr));
313 return (m->m_pkthdr.flowid);
317 * Retrieve or set threshold between group-source queries in seconds.
319 * VIMAGE: Assume curvnet set by caller.
320 * SMPng: NOTE: Serialized by MLD lock.
323 sysctl_mld_gsr(SYSCTL_HANDLER_ARGS)
328 error = sysctl_wire_old_buffer(req, sizeof(int));
334 i = V_mld_gsrdelay.tv_sec;
336 error = sysctl_handle_int(oidp, &i, 0, req);
337 if (error || !req->newptr)
340 if (i < -1 || i >= 60) {
345 CTR2(KTR_MLD, "change mld_gsrdelay from %d to %d",
346 V_mld_gsrdelay.tv_sec, i);
347 V_mld_gsrdelay.tv_sec = i;
355 * Expose struct mld_ifsoftc to userland, keyed by ifindex.
356 * For use by ifmcstat(8).
358 * SMPng: NOTE: Does an unlocked ifindex space read.
359 * VIMAGE: Assume curvnet set by caller. The node handler itself
360 * is not directly virtualized.
363 sysctl_mld_ifinfo(SYSCTL_HANDLER_ARGS)
369 struct mld_ifsoftc *mli;
374 if (req->newptr != NULL)
380 error = sysctl_wire_old_buffer(req, sizeof(struct mld_ifinfo));
385 IN6_MULTI_LIST_LOCK();
388 if (name[0] <= 0 || name[0] > V_if_index) {
395 ifp = ifnet_byindex(name[0]);
399 LIST_FOREACH(mli, &V_mli_head, mli_link) {
400 if (ifp == mli->mli_ifp) {
401 struct mld_ifinfo info;
403 info.mli_version = mli->mli_version;
404 info.mli_v1_timer = mli->mli_v1_timer;
405 info.mli_v2_timer = mli->mli_v2_timer;
406 info.mli_flags = mli->mli_flags;
407 info.mli_rv = mli->mli_rv;
408 info.mli_qi = mli->mli_qi;
409 info.mli_qri = mli->mli_qri;
410 info.mli_uri = mli->mli_uri;
411 error = SYSCTL_OUT(req, &info, sizeof(info));
418 IN6_MULTI_LIST_UNLOCK();
424 * Dispatch an entire queue of pending packet chains.
425 * VIMAGE: Assumes the vnet pointer has been set.
428 mld_dispatch_queue(struct mbufq *mq, int limit)
432 while ((m = mbufq_dequeue(mq)) != NULL) {
433 CTR3(KTR_MLD, "%s: dispatch %p from %p", __func__, mq, m);
434 mld_dispatch_packet(m);
441 * Filter outgoing MLD report state by group.
443 * Reports are ALWAYS suppressed for ALL-HOSTS (ff02::1)
444 * and node-local addresses. However, kernel and socket consumers
445 * always embed the KAME scope ID in the address provided, so strip it
446 * when performing comparison.
447 * Note: This is not the same as the *multicast* scope.
449 * Return zero if the given group is one for which MLD reports
450 * should be suppressed, or non-zero if reports should be issued.
453 mld_is_addr_reported(const struct in6_addr *addr)
456 KASSERT(IN6_IS_ADDR_MULTICAST(addr), ("%s: not multicast", __func__));
458 if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_NODELOCAL)
461 if (IPV6_ADDR_MC_SCOPE(addr) == IPV6_ADDR_SCOPE_LINKLOCAL) {
462 struct in6_addr tmp = *addr;
463 in6_clearscope(&tmp);
464 if (IN6_ARE_ADDR_EQUAL(&tmp, &in6addr_linklocal_allnodes))
472 * Attach MLD when PF_INET6 is attached to an interface.
474 * SMPng: Normally called with IF_AFDATA_LOCK held.
477 mld_domifattach(struct ifnet *ifp)
479 struct mld_ifsoftc *mli;
481 CTR3(KTR_MLD, "%s: called for ifp %p(%s)",
482 __func__, ifp, if_name(ifp));
486 mli = mli_alloc_locked(ifp);
487 if (!(ifp->if_flags & IFF_MULTICAST))
488 mli->mli_flags |= MLIF_SILENT;
490 mli->mli_flags |= MLIF_USEALLOW;
498 * VIMAGE: assume curvnet set by caller.
500 static struct mld_ifsoftc *
501 mli_alloc_locked(/*const*/ struct ifnet *ifp)
503 struct mld_ifsoftc *mli;
507 mli = malloc(sizeof(struct mld_ifsoftc), M_MLD, M_NOWAIT|M_ZERO);
512 mli->mli_version = MLD_VERSION_2;
514 mli->mli_rv = MLD_RV_INIT;
515 mli->mli_qi = MLD_QI_INIT;
516 mli->mli_qri = MLD_QRI_INIT;
517 mli->mli_uri = MLD_URI_INIT;
518 mbufq_init(&mli->mli_gq, MLD_MAX_RESPONSE_PACKETS);
520 LIST_INSERT_HEAD(&V_mli_head, mli, mli_link);
522 CTR2(KTR_MLD, "allocate mld_ifsoftc for ifp %p(%s)",
532 * NOTE: Some finalization tasks need to run before the protocol domain
533 * is detached, but also before the link layer does its cleanup.
534 * Run before link-layer cleanup; cleanup groups, but do not free MLD state.
536 * SMPng: Caller must hold IN6_MULTI_LOCK().
537 * Must take IF_ADDR_LOCK() to cover if_multiaddrs iterator.
538 * XXX This routine is also bitten by unlocked ifma_protospec access.
541 mld_ifdetach(struct ifnet *ifp, struct in6_multi_head *inmh)
543 struct epoch_tracker et;
544 struct mld_ifsoftc *mli;
545 struct ifmultiaddr *ifma;
546 struct in6_multi *inm;
548 CTR3(KTR_MLD, "%s: called for ifp %p(%s)", __func__, ifp,
551 IN6_MULTI_LIST_LOCK_ASSERT();
554 mli = MLD_IFINFO(ifp);
557 * Extract list of in6_multi associated with the detaching ifp
558 * which the PF_INET6 layer is about to release.
561 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
562 inm = in6m_ifmultiaddr_get_inm(ifma);
565 in6m_disconnect_locked(inmh, inm);
567 if (mli->mli_version == MLD_VERSION_2) {
568 in6m_clear_recorded(inm);
571 * We need to release the final reference held
572 * for issuing the INCLUDE {}.
574 if (inm->in6m_state == MLD_LEAVING_MEMBER) {
575 inm->in6m_state = MLD_NOT_MEMBER;
576 in6m_rele_locked(inmh, inm);
581 IF_ADDR_WUNLOCK(ifp);
586 * Hook for domifdetach.
587 * Runs after link-layer cleanup; free MLD state.
589 * SMPng: Normally called with IF_AFDATA_LOCK held.
592 mld_domifdetach(struct ifnet *ifp)
595 CTR3(KTR_MLD, "%s: called for ifp %p(%s)",
596 __func__, ifp, if_name(ifp));
599 mli_delete_locked(ifp);
604 mli_delete_locked(const struct ifnet *ifp)
606 struct mld_ifsoftc *mli, *tmli;
608 CTR3(KTR_MLD, "%s: freeing mld_ifsoftc for ifp %p(%s)",
609 __func__, ifp, if_name(ifp));
613 LIST_FOREACH_SAFE(mli, &V_mli_head, mli_link, tmli) {
614 if (mli->mli_ifp == ifp) {
616 * Free deferred General Query responses.
618 mbufq_drain(&mli->mli_gq);
620 LIST_REMOVE(mli, mli_link);
629 * Process a received MLDv1 general or address-specific query.
630 * Assumes that the query header has been pulled up to sizeof(mld_hdr).
632 * NOTE: Can't be fully const correct as we temporarily embed scope ID in
633 * mld_addr. This is OK as we own the mbuf chain.
636 mld_v1_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6,
637 /*const*/ struct mld_hdr *mld)
639 struct ifmultiaddr *ifma;
640 struct mld_ifsoftc *mli;
641 struct in6_multi *inm;
642 int is_general_query;
645 char ip6tbuf[INET6_ADDRSTRLEN];
650 is_general_query = 0;
653 CTR3(KTR_MLD, "ignore v1 query %s on ifp %p(%s)",
654 ip6_sprintf(ip6tbuf, &mld->mld_addr),
660 * RFC3810 Section 6.2: MLD queries must originate from
661 * a router's link-local address.
663 if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
664 CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
665 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
671 * Do address field validation upfront before we accept
674 if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) {
676 * MLDv1 General Query.
677 * If this was not sent to the all-nodes group, ignore it.
682 in6_clearscope(&dst);
683 if (!IN6_ARE_ADDR_EQUAL(&dst, &in6addr_linklocal_allnodes))
685 is_general_query = 1;
688 * Embed scope ID of receiving interface in MLD query for
689 * lookup whilst we don't hold other locks.
691 in6_setscope(&mld->mld_addr, ifp, NULL);
694 IN6_MULTI_LIST_LOCK();
698 * Switch to MLDv1 host compatibility mode.
700 mli = MLD_IFINFO(ifp);
701 KASSERT(mli != NULL, ("%s: no mld_ifsoftc for ifp %p", __func__, ifp));
702 mld_set_version(mli, MLD_VERSION_1);
704 timer = (ntohs(mld->mld_maxdelay) * PR_FASTHZ) / MLD_TIMER_SCALE;
708 if (is_general_query) {
710 * For each reporting group joined on this
711 * interface, kick the report timer.
713 CTR2(KTR_MLD, "process v1 general query on ifp %p(%s)",
715 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
716 inm = in6m_ifmultiaddr_get_inm(ifma);
719 mld_v1_update_group(inm, timer);
723 * MLDv1 Group-Specific Query.
724 * If this is a group-specific MLDv1 query, we need only
725 * look up the single group to process it.
727 inm = in6m_lookup_locked(ifp, &mld->mld_addr);
729 CTR3(KTR_MLD, "process v1 query %s on ifp %p(%s)",
730 ip6_sprintf(ip6tbuf, &mld->mld_addr),
732 mld_v1_update_group(inm, timer);
734 /* XXX Clear embedded scope ID as userland won't expect it. */
735 in6_clearscope(&mld->mld_addr);
739 IN6_MULTI_LIST_UNLOCK();
745 * Update the report timer on a group in response to an MLDv1 query.
747 * If we are becoming the reporting member for this group, start the timer.
748 * If we already are the reporting member for this group, and timer is
749 * below the threshold, reset it.
751 * We may be updating the group for the first time since we switched
752 * to MLDv2. If we are, then we must clear any recorded source lists,
753 * and transition to REPORTING state; the group timer is overloaded
754 * for group and group-source query responses.
756 * Unlike MLDv2, the delay per group should be jittered
757 * to avoid bursts of MLDv1 reports.
760 mld_v1_update_group(struct in6_multi *inm, const int timer)
763 char ip6tbuf[INET6_ADDRSTRLEN];
766 CTR4(KTR_MLD, "%s: %s/%s timer=%d", __func__,
767 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
768 if_name(inm->in6m_ifp), timer);
770 IN6_MULTI_LIST_LOCK_ASSERT();
772 switch (inm->in6m_state) {
774 case MLD_SILENT_MEMBER:
776 case MLD_REPORTING_MEMBER:
777 if (inm->in6m_timer != 0 &&
778 inm->in6m_timer <= timer) {
779 CTR1(KTR_MLD, "%s: REPORTING and timer running, "
780 "skipping.", __func__);
784 case MLD_SG_QUERY_PENDING_MEMBER:
785 case MLD_G_QUERY_PENDING_MEMBER:
786 case MLD_IDLE_MEMBER:
787 case MLD_LAZY_MEMBER:
788 case MLD_AWAKENING_MEMBER:
789 CTR1(KTR_MLD, "%s: ->REPORTING", __func__);
790 inm->in6m_state = MLD_REPORTING_MEMBER;
791 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
792 V_current_state_timers_running6 = 1;
794 case MLD_SLEEPING_MEMBER:
795 CTR1(KTR_MLD, "%s: ->AWAKENING", __func__);
796 inm->in6m_state = MLD_AWAKENING_MEMBER;
798 case MLD_LEAVING_MEMBER:
804 * Process a received MLDv2 general, group-specific or
805 * group-and-source-specific query.
807 * Assumes that mld points to a struct mldv2_query which is stored in
810 * Return 0 if successful, otherwise an appropriate error code is returned.
813 mld_v2_input_query(struct ifnet *ifp, const struct ip6_hdr *ip6,
814 struct mbuf *m, struct mldv2_query *mld, const int off, const int icmp6len)
816 struct mld_ifsoftc *mli;
817 struct in6_multi *inm;
818 uint32_t maxdelay, nsrc, qqi;
819 int is_general_query;
823 char ip6tbuf[INET6_ADDRSTRLEN];
829 CTR3(KTR_MLD, "ignore v2 query src %s on ifp %p(%s)",
830 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
836 * RFC3810 Section 6.2: MLD queries must originate from
837 * a router's link-local address.
839 if (!IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
840 CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
841 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
846 is_general_query = 0;
848 CTR2(KTR_MLD, "input v2 query on ifp %p(%s)", ifp, if_name(ifp));
850 maxdelay = ntohs(mld->mld_maxdelay); /* in 1/10ths of a second */
851 if (maxdelay >= 32768) {
852 maxdelay = (MLD_MRC_MANT(maxdelay) | 0x1000) <<
853 (MLD_MRC_EXP(maxdelay) + 3);
855 timer = (maxdelay * PR_FASTHZ) / MLD_TIMER_SCALE;
859 qrv = MLD_QRV(mld->mld_misc);
861 CTR3(KTR_MLD, "%s: clamping qrv %d to %d", __func__,
868 qqi = MLD_QQIC_MANT(mld->mld_qqi) <<
869 (MLD_QQIC_EXP(mld->mld_qqi) + 3);
872 nsrc = ntohs(mld->mld_numsrc);
873 if (nsrc > MLD_MAX_GS_SOURCES)
875 if (icmp6len < sizeof(struct mldv2_query) +
876 (nsrc * sizeof(struct in6_addr)))
880 * Do further input validation upfront to avoid resetting timers
881 * should we need to discard this query.
883 if (IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr)) {
885 * A general query with a source list has undefined
886 * behaviour; discard it.
890 is_general_query = 1;
893 * Embed scope ID of receiving interface in MLD query for
894 * lookup whilst we don't hold other locks (due to KAME
895 * locking lameness). We own this mbuf chain just now.
897 in6_setscope(&mld->mld_addr, ifp, NULL);
900 IN6_MULTI_LIST_LOCK();
903 mli = MLD_IFINFO(ifp);
904 KASSERT(mli != NULL, ("%s: no mld_ifsoftc for ifp %p", __func__, ifp));
907 * Discard the v2 query if we're in Compatibility Mode.
908 * The RFC is pretty clear that hosts need to stay in MLDv1 mode
909 * until the Old Version Querier Present timer expires.
911 if (mli->mli_version != MLD_VERSION_2)
914 mld_set_version(mli, MLD_VERSION_2);
917 mli->mli_qri = maxdelay;
919 CTR4(KTR_MLD, "%s: qrv %d qi %d maxdelay %d", __func__, qrv, qqi,
922 if (is_general_query) {
924 * MLDv2 General Query.
926 * Schedule a current-state report on this ifp for
927 * all groups, possibly containing source lists.
929 * If there is a pending General Query response
930 * scheduled earlier than the selected delay, do
931 * not schedule any other reports.
932 * Otherwise, reset the interface timer.
934 CTR2(KTR_MLD, "process v2 general query on ifp %p(%s)",
936 if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer) {
937 mli->mli_v2_timer = MLD_RANDOM_DELAY(timer);
938 V_interface_timers_running6 = 1;
942 * MLDv2 Group-specific or Group-and-source-specific Query.
944 * Group-source-specific queries are throttled on
945 * a per-group basis to defeat denial-of-service attempts.
946 * Queries for groups we are not a member of on this
947 * link are simply ignored.
949 inm = in6m_lookup_locked(ifp, &mld->mld_addr);
953 if (!ratecheck(&inm->in6m_lastgsrtv,
955 CTR1(KTR_MLD, "%s: GS query throttled.",
960 CTR2(KTR_MLD, "process v2 group query on ifp %p(%s)",
963 * If there is a pending General Query response
964 * scheduled sooner than the selected delay, no
965 * further report need be scheduled.
966 * Otherwise, prepare to respond to the
967 * group-specific or group-and-source query.
969 if (mli->mli_v2_timer == 0 || mli->mli_v2_timer >= timer)
970 mld_v2_process_group_query(inm, mli, timer, m, mld, off);
972 /* XXX Clear embedded scope ID as userland won't expect it. */
973 in6_clearscope(&mld->mld_addr);
978 IN6_MULTI_LIST_UNLOCK();
984 * Process a received MLDv2 group-specific or group-and-source-specific
986 * Return <0 if any error occurred. Currently this is ignored.
989 mld_v2_process_group_query(struct in6_multi *inm, struct mld_ifsoftc *mli,
990 int timer, struct mbuf *m0, struct mldv2_query *mld, const int off)
995 IN6_MULTI_LIST_LOCK_ASSERT();
1000 switch (inm->in6m_state) {
1001 case MLD_NOT_MEMBER:
1002 case MLD_SILENT_MEMBER:
1003 case MLD_SLEEPING_MEMBER:
1004 case MLD_LAZY_MEMBER:
1005 case MLD_AWAKENING_MEMBER:
1006 case MLD_IDLE_MEMBER:
1007 case MLD_LEAVING_MEMBER:
1010 case MLD_REPORTING_MEMBER:
1011 case MLD_G_QUERY_PENDING_MEMBER:
1012 case MLD_SG_QUERY_PENDING_MEMBER:
1016 nsrc = ntohs(mld->mld_numsrc);
1018 /* Length should be checked by calling function. */
1019 KASSERT((m0->m_flags & M_PKTHDR) == 0 ||
1020 m0->m_pkthdr.len >= off + sizeof(struct mldv2_query) +
1021 nsrc * sizeof(struct in6_addr),
1022 ("mldv2 packet is too short: (%d bytes < %zd bytes, m=%p)",
1023 m0->m_pkthdr.len, off + sizeof(struct mldv2_query) +
1024 nsrc * sizeof(struct in6_addr), m0));
1028 * Deal with group-specific queries upfront.
1029 * If any group query is already pending, purge any recorded
1030 * source-list state if it exists, and schedule a query response
1031 * for this group-specific query.
1034 if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER ||
1035 inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER) {
1036 in6m_clear_recorded(inm);
1037 timer = min(inm->in6m_timer, timer);
1039 inm->in6m_state = MLD_G_QUERY_PENDING_MEMBER;
1040 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
1041 V_current_state_timers_running6 = 1;
1046 * Deal with the case where a group-and-source-specific query has
1047 * been received but a group-specific query is already pending.
1049 if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER) {
1050 timer = min(inm->in6m_timer, timer);
1051 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
1052 V_current_state_timers_running6 = 1;
1057 * Finally, deal with the case where a group-and-source-specific
1058 * query has been received, where a response to a previous g-s-r
1059 * query exists, or none exists.
1060 * In this case, we need to parse the source-list which the Querier
1061 * has provided us with and check if we have any source list filter
1062 * entries at T1 for these sources. If we do not, there is no need
1063 * schedule a report and the query may be dropped.
1064 * If we do, we must record them and schedule a current-state
1065 * report for those sources.
1067 if (inm->in6m_nsrc > 0) {
1068 struct in6_addr srcaddr;
1072 soff = off + sizeof(struct mldv2_query);
1074 for (i = 0; i < nsrc; i++) {
1075 m_copydata(m0, soff, sizeof(struct in6_addr),
1077 retval = in6m_record_source(inm, &srcaddr);
1080 nrecorded += retval;
1081 soff += sizeof(struct in6_addr);
1083 if (nrecorded > 0) {
1085 "%s: schedule response to SG query", __func__);
1086 inm->in6m_state = MLD_SG_QUERY_PENDING_MEMBER;
1087 inm->in6m_timer = MLD_RANDOM_DELAY(timer);
1088 V_current_state_timers_running6 = 1;
1096 * Process a received MLDv1 host membership report.
1097 * Assumes mld points to mld_hdr in pulled up mbuf chain.
1099 * NOTE: Can't be fully const correct as we temporarily embed scope ID in
1100 * mld_addr. This is OK as we own the mbuf chain.
1103 mld_v1_input_report(struct ifnet *ifp, const struct ip6_hdr *ip6,
1104 /*const*/ struct mld_hdr *mld)
1106 struct in6_addr src, dst;
1107 struct in6_ifaddr *ia;
1108 struct in6_multi *inm;
1110 char ip6tbuf[INET6_ADDRSTRLEN];
1115 if (!mld_v1enable) {
1116 CTR3(KTR_MLD, "ignore v1 report %s on ifp %p(%s)",
1117 ip6_sprintf(ip6tbuf, &mld->mld_addr),
1122 if (ifp->if_flags & IFF_LOOPBACK)
1126 * MLDv1 reports must originate from a host's link-local address,
1127 * or the unspecified address (when booting).
1130 in6_clearscope(&src);
1131 if (!IN6_IS_SCOPE_LINKLOCAL(&src) && !IN6_IS_ADDR_UNSPECIFIED(&src)) {
1132 CTR3(KTR_MLD, "ignore v1 query src %s on ifp %p(%s)",
1133 ip6_sprintf(ip6tbuf, &ip6->ip6_src),
1139 * RFC2710 Section 4: MLDv1 reports must pertain to a multicast
1140 * group, and must be directed to the group itself.
1143 in6_clearscope(&dst);
1144 if (!IN6_IS_ADDR_MULTICAST(&mld->mld_addr) ||
1145 !IN6_ARE_ADDR_EQUAL(&mld->mld_addr, &dst)) {
1146 CTR3(KTR_MLD, "ignore v1 query dst %s on ifp %p(%s)",
1147 ip6_sprintf(ip6tbuf, &ip6->ip6_dst),
1153 * Make sure we don't hear our own membership report, as fast
1154 * leave requires knowing that we are the only member of a
1155 * group. Assume we used the link-local address if available,
1156 * otherwise look for ::.
1158 * XXX Note that scope ID comparison is needed for the address
1159 * returned by in6ifa_ifpforlinklocal(), but SHOULD NOT be
1160 * performed for the on-wire address.
1162 ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
1163 if ((ia && IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, IA6_IN6(ia))) ||
1164 (ia == NULL && IN6_IS_ADDR_UNSPECIFIED(&src))) {
1166 ifa_free(&ia->ia_ifa);
1170 ifa_free(&ia->ia_ifa);
1172 CTR3(KTR_MLD, "process v1 report %s on ifp %p(%s)",
1173 ip6_sprintf(ip6tbuf, &mld->mld_addr), ifp, if_name(ifp));
1176 * Embed scope ID of receiving interface in MLD query for lookup
1177 * whilst we don't hold other locks (due to KAME locking lameness).
1179 if (!IN6_IS_ADDR_UNSPECIFIED(&mld->mld_addr))
1180 in6_setscope(&mld->mld_addr, ifp, NULL);
1182 IN6_MULTI_LIST_LOCK();
1186 * MLDv1 report suppression.
1187 * If we are a member of this group, and our membership should be
1188 * reported, and our group timer is pending or about to be reset,
1189 * stop our group timer by transitioning to the 'lazy' state.
1191 inm = in6m_lookup_locked(ifp, &mld->mld_addr);
1193 struct mld_ifsoftc *mli;
1195 mli = inm->in6m_mli;
1196 KASSERT(mli != NULL,
1197 ("%s: no mli for ifp %p", __func__, ifp));
1200 * If we are in MLDv2 host mode, do not allow the
1201 * other host's MLDv1 report to suppress our reports.
1203 if (mli->mli_version == MLD_VERSION_2)
1206 inm->in6m_timer = 0;
1208 switch (inm->in6m_state) {
1209 case MLD_NOT_MEMBER:
1210 case MLD_SILENT_MEMBER:
1211 case MLD_SLEEPING_MEMBER:
1213 case MLD_REPORTING_MEMBER:
1214 case MLD_IDLE_MEMBER:
1215 case MLD_AWAKENING_MEMBER:
1217 "report suppressed for %s on ifp %p(%s)",
1218 ip6_sprintf(ip6tbuf, &mld->mld_addr),
1220 case MLD_LAZY_MEMBER:
1221 inm->in6m_state = MLD_LAZY_MEMBER;
1223 case MLD_G_QUERY_PENDING_MEMBER:
1224 case MLD_SG_QUERY_PENDING_MEMBER:
1225 case MLD_LEAVING_MEMBER:
1232 IN6_MULTI_LIST_UNLOCK();
1234 /* XXX Clear embedded scope ID as userland won't expect it. */
1235 in6_clearscope(&mld->mld_addr);
1243 * Assume query messages which fit in a single ICMPv6 message header
1244 * have been pulled up.
1245 * Assume that userland will want to see the message, even if it
1246 * otherwise fails kernel input validation; do not free it.
1247 * Pullup may however free the mbuf chain m if it fails.
1249 * Return IPPROTO_DONE if we freed m. Otherwise, return 0.
1252 mld_input(struct mbuf *m, int off, int icmp6len)
1255 struct ip6_hdr *ip6;
1256 struct mld_hdr *mld;
1259 CTR3(KTR_MLD, "%s: called w/mbuf (%p,%d)", __func__, m, off);
1261 ifp = m->m_pkthdr.rcvif;
1263 ip6 = mtod(m, struct ip6_hdr *);
1265 /* Pullup to appropriate size. */
1266 mld = (struct mld_hdr *)(mtod(m, uint8_t *) + off);
1267 if (mld->mld_type == MLD_LISTENER_QUERY &&
1268 icmp6len >= sizeof(struct mldv2_query)) {
1269 mldlen = sizeof(struct mldv2_query);
1271 mldlen = sizeof(struct mld_hdr);
1273 IP6_EXTHDR_GET(mld, struct mld_hdr *, m, off, mldlen);
1275 ICMP6STAT_INC(icp6s_badlen);
1276 return (IPPROTO_DONE);
1280 * Userland needs to see all of this traffic for implementing
1281 * the endpoint discovery portion of multicast routing.
1283 switch (mld->mld_type) {
1284 case MLD_LISTENER_QUERY:
1285 icmp6_ifstat_inc(ifp, ifs6_in_mldquery);
1286 if (icmp6len == sizeof(struct mld_hdr)) {
1287 if (mld_v1_input_query(ifp, ip6, mld) != 0)
1289 } else if (icmp6len >= sizeof(struct mldv2_query)) {
1290 if (mld_v2_input_query(ifp, ip6, m,
1291 (struct mldv2_query *)mld, off, icmp6len) != 0)
1295 case MLD_LISTENER_REPORT:
1296 icmp6_ifstat_inc(ifp, ifs6_in_mldreport);
1297 if (mld_v1_input_report(ifp, ip6, mld) != 0)
1300 case MLDV2_LISTENER_REPORT:
1301 icmp6_ifstat_inc(ifp, ifs6_in_mldreport);
1303 case MLD_LISTENER_DONE:
1304 icmp6_ifstat_inc(ifp, ifs6_in_mlddone);
1314 * Fast timeout handler (global).
1315 * VIMAGE: Timeout handlers are expected to service all vimages.
1320 struct in6_multi_head inmh;
1321 VNET_ITERATOR_DECL(vnet_iter);
1325 VNET_LIST_RLOCK_NOSLEEP();
1326 VNET_FOREACH(vnet_iter) {
1327 CURVNET_SET(vnet_iter);
1328 mld_fasttimo_vnet(&inmh);
1331 VNET_LIST_RUNLOCK_NOSLEEP();
1332 in6m_release_list_deferred(&inmh);
1336 * Fast timeout handler (per-vnet).
1338 * VIMAGE: Assume caller has set up our curvnet.
1341 mld_fasttimo_vnet(struct in6_multi_head *inmh)
1343 struct epoch_tracker et;
1344 struct mbufq scq; /* State-change packets */
1345 struct mbufq qrq; /* Query response packets */
1347 struct mld_ifsoftc *mli;
1348 struct ifmultiaddr *ifma;
1349 struct in6_multi *inm;
1355 * Quick check to see if any work needs to be done, in order to
1356 * minimize the overhead of fasttimo processing.
1357 * SMPng: XXX Unlocked reads.
1359 if (!V_current_state_timers_running6 &&
1360 !V_interface_timers_running6 &&
1361 !V_state_change_timers_running6)
1364 IN6_MULTI_LIST_LOCK();
1368 * MLDv2 General Query response timer processing.
1370 if (V_interface_timers_running6) {
1371 CTR1(KTR_MLD, "%s: interface timers running", __func__);
1373 V_interface_timers_running6 = 0;
1374 LIST_FOREACH(mli, &V_mli_head, mli_link) {
1375 if (mli->mli_v2_timer == 0) {
1377 } else if (--mli->mli_v2_timer == 0) {
1378 mld_v2_dispatch_general_query(mli);
1380 V_interface_timers_running6 = 1;
1385 if (!V_current_state_timers_running6 &&
1386 !V_state_change_timers_running6)
1389 V_current_state_timers_running6 = 0;
1390 V_state_change_timers_running6 = 0;
1392 CTR1(KTR_MLD, "%s: state change timers running", __func__);
1395 * MLD host report and state-change timer processing.
1396 * Note: Processing a v2 group timer may remove a node.
1398 LIST_FOREACH(mli, &V_mli_head, mli_link) {
1401 if (mli->mli_version == MLD_VERSION_2) {
1402 uri_fasthz = MLD_RANDOM_DELAY(mli->mli_uri *
1404 mbufq_init(&qrq, MLD_MAX_G_GS_PACKETS);
1405 mbufq_init(&scq, MLD_MAX_STATE_CHANGE_PACKETS);
1408 NET_EPOCH_ENTER(et);
1410 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1411 inm = in6m_ifmultiaddr_get_inm(ifma);
1414 switch (mli->mli_version) {
1416 mld_v1_process_group_timer(inmh, inm);
1419 mld_v2_process_group_timers(inmh, &qrq,
1420 &scq, inm, uri_fasthz);
1424 IF_ADDR_WUNLOCK(ifp);
1426 switch (mli->mli_version) {
1429 * Transmit reports for this lifecycle. This
1430 * is done while not holding IF_ADDR_LOCK
1431 * since this can call
1432 * in6ifa_ifpforlinklocal() which locks
1433 * IF_ADDR_LOCK internally as well as
1434 * ip6_output() to transmit a packet.
1436 while ((inm = SLIST_FIRST(inmh)) != NULL) {
1437 SLIST_REMOVE_HEAD(inmh, in6m_defer);
1438 (void)mld_v1_transmit_report(inm,
1439 MLD_LISTENER_REPORT);
1443 mld_dispatch_queue(&qrq, 0);
1444 mld_dispatch_queue(&scq, 0);
1452 IN6_MULTI_LIST_UNLOCK();
1456 * Update host report group timer.
1457 * Will update the global pending timer flags.
1460 mld_v1_process_group_timer(struct in6_multi_head *inmh, struct in6_multi *inm)
1462 int report_timer_expired;
1464 IN6_MULTI_LIST_LOCK_ASSERT();
1467 if (inm->in6m_timer == 0) {
1468 report_timer_expired = 0;
1469 } else if (--inm->in6m_timer == 0) {
1470 report_timer_expired = 1;
1472 V_current_state_timers_running6 = 1;
1476 switch (inm->in6m_state) {
1477 case MLD_NOT_MEMBER:
1478 case MLD_SILENT_MEMBER:
1479 case MLD_IDLE_MEMBER:
1480 case MLD_LAZY_MEMBER:
1481 case MLD_SLEEPING_MEMBER:
1482 case MLD_AWAKENING_MEMBER:
1484 case MLD_REPORTING_MEMBER:
1485 if (report_timer_expired) {
1486 inm->in6m_state = MLD_IDLE_MEMBER;
1487 SLIST_INSERT_HEAD(inmh, inm, in6m_defer);
1490 case MLD_G_QUERY_PENDING_MEMBER:
1491 case MLD_SG_QUERY_PENDING_MEMBER:
1492 case MLD_LEAVING_MEMBER:
1498 * Update a group's timers for MLDv2.
1499 * Will update the global pending timer flags.
1500 * Note: Unlocked read from mli.
1503 mld_v2_process_group_timers(struct in6_multi_head *inmh,
1504 struct mbufq *qrq, struct mbufq *scq,
1505 struct in6_multi *inm, const int uri_fasthz)
1507 int query_response_timer_expired;
1508 int state_change_retransmit_timer_expired;
1510 char ip6tbuf[INET6_ADDRSTRLEN];
1513 IN6_MULTI_LIST_LOCK_ASSERT();
1516 query_response_timer_expired = 0;
1517 state_change_retransmit_timer_expired = 0;
1520 * During a transition from compatibility mode back to MLDv2,
1521 * a group record in REPORTING state may still have its group
1522 * timer active. This is a no-op in this function; it is easier
1523 * to deal with it here than to complicate the slow-timeout path.
1525 if (inm->in6m_timer == 0) {
1526 query_response_timer_expired = 0;
1527 } else if (--inm->in6m_timer == 0) {
1528 query_response_timer_expired = 1;
1530 V_current_state_timers_running6 = 1;
1533 if (inm->in6m_sctimer == 0) {
1534 state_change_retransmit_timer_expired = 0;
1535 } else if (--inm->in6m_sctimer == 0) {
1536 state_change_retransmit_timer_expired = 1;
1538 V_state_change_timers_running6 = 1;
1541 /* We are in fasttimo, so be quick about it. */
1542 if (!state_change_retransmit_timer_expired &&
1543 !query_response_timer_expired)
1546 switch (inm->in6m_state) {
1547 case MLD_NOT_MEMBER:
1548 case MLD_SILENT_MEMBER:
1549 case MLD_SLEEPING_MEMBER:
1550 case MLD_LAZY_MEMBER:
1551 case MLD_AWAKENING_MEMBER:
1552 case MLD_IDLE_MEMBER:
1554 case MLD_G_QUERY_PENDING_MEMBER:
1555 case MLD_SG_QUERY_PENDING_MEMBER:
1557 * Respond to a previously pending Group-Specific
1558 * or Group-and-Source-Specific query by enqueueing
1559 * the appropriate Current-State report for
1560 * immediate transmission.
1562 if (query_response_timer_expired) {
1565 retval = mld_v2_enqueue_group_record(qrq, inm, 0, 1,
1566 (inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER),
1568 CTR2(KTR_MLD, "%s: enqueue record = %d",
1570 inm->in6m_state = MLD_REPORTING_MEMBER;
1571 in6m_clear_recorded(inm);
1574 case MLD_REPORTING_MEMBER:
1575 case MLD_LEAVING_MEMBER:
1576 if (state_change_retransmit_timer_expired) {
1578 * State-change retransmission timer fired.
1579 * If there are any further pending retransmissions,
1580 * set the global pending state-change flag, and
1583 if (--inm->in6m_scrv > 0) {
1584 inm->in6m_sctimer = uri_fasthz;
1585 V_state_change_timers_running6 = 1;
1588 * Retransmit the previously computed state-change
1589 * report. If there are no further pending
1590 * retransmissions, the mbuf queue will be consumed.
1591 * Update T0 state to T1 as we have now sent
1594 (void)mld_v2_merge_state_changes(inm, scq);
1597 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
1598 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
1599 if_name(inm->in6m_ifp));
1602 * If we are leaving the group for good, make sure
1603 * we release MLD's reference to it.
1604 * This release must be deferred using a SLIST,
1605 * as we are called from a loop which traverses
1606 * the in_ifmultiaddr TAILQ.
1608 if (inm->in6m_state == MLD_LEAVING_MEMBER &&
1609 inm->in6m_scrv == 0) {
1610 inm->in6m_state = MLD_NOT_MEMBER;
1611 in6m_disconnect_locked(inmh, inm);
1612 in6m_rele_locked(inmh, inm);
1620 * Switch to a different version on the given interface,
1621 * as per Section 9.12.
1624 mld_set_version(struct mld_ifsoftc *mli, const int version)
1626 int old_version_timer;
1630 CTR4(KTR_MLD, "%s: switching to v%d on ifp %p(%s)", __func__,
1631 version, mli->mli_ifp, if_name(mli->mli_ifp));
1633 if (version == MLD_VERSION_1) {
1635 * Compute the "Older Version Querier Present" timer as per
1638 old_version_timer = (mli->mli_rv * mli->mli_qi) + mli->mli_qri;
1639 old_version_timer *= PR_SLOWHZ;
1640 mli->mli_v1_timer = old_version_timer;
1643 if (mli->mli_v1_timer > 0 && mli->mli_version != MLD_VERSION_1) {
1644 mli->mli_version = MLD_VERSION_1;
1645 mld_v2_cancel_link_timers(mli);
1650 * Cancel pending MLDv2 timers for the given link and all groups
1651 * joined on it; state-change, general-query, and group-query timers.
1654 mld_v2_cancel_link_timers(struct mld_ifsoftc *mli)
1656 struct epoch_tracker et;
1657 struct in6_multi_head inmh;
1658 struct ifmultiaddr *ifma;
1660 struct in6_multi *inm;
1662 CTR3(KTR_MLD, "%s: cancel v2 timers on ifp %p(%s)", __func__,
1663 mli->mli_ifp, if_name(mli->mli_ifp));
1666 IN6_MULTI_LIST_LOCK_ASSERT();
1670 * Fast-track this potentially expensive operation
1671 * by checking all the global 'timer pending' flags.
1673 if (!V_interface_timers_running6 &&
1674 !V_state_change_timers_running6 &&
1675 !V_current_state_timers_running6)
1678 mli->mli_v2_timer = 0;
1683 NET_EPOCH_ENTER(et);
1684 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1685 inm = in6m_ifmultiaddr_get_inm(ifma);
1688 switch (inm->in6m_state) {
1689 case MLD_NOT_MEMBER:
1690 case MLD_SILENT_MEMBER:
1691 case MLD_IDLE_MEMBER:
1692 case MLD_LAZY_MEMBER:
1693 case MLD_SLEEPING_MEMBER:
1694 case MLD_AWAKENING_MEMBER:
1696 case MLD_LEAVING_MEMBER:
1698 * If we are leaving the group and switching
1699 * version, we need to release the final
1700 * reference held for issuing the INCLUDE {}.
1702 if (inm->in6m_refcount == 1)
1703 in6m_disconnect_locked(&inmh, inm);
1704 in6m_rele_locked(&inmh, inm);
1706 case MLD_G_QUERY_PENDING_MEMBER:
1707 case MLD_SG_QUERY_PENDING_MEMBER:
1708 in6m_clear_recorded(inm);
1710 case MLD_REPORTING_MEMBER:
1711 inm->in6m_sctimer = 0;
1712 inm->in6m_timer = 0;
1713 inm->in6m_state = MLD_REPORTING_MEMBER;
1715 * Free any pending MLDv2 state-change records.
1717 mbufq_drain(&inm->in6m_scq);
1722 IF_ADDR_WUNLOCK(ifp);
1723 in6m_release_list_deferred(&inmh);
1727 * Global slowtimo handler.
1728 * VIMAGE: Timeout handlers are expected to service all vimages.
1733 VNET_ITERATOR_DECL(vnet_iter);
1735 VNET_LIST_RLOCK_NOSLEEP();
1736 VNET_FOREACH(vnet_iter) {
1737 CURVNET_SET(vnet_iter);
1738 mld_slowtimo_vnet();
1741 VNET_LIST_RUNLOCK_NOSLEEP();
1745 * Per-vnet slowtimo handler.
1748 mld_slowtimo_vnet(void)
1750 struct mld_ifsoftc *mli;
1754 LIST_FOREACH(mli, &V_mli_head, mli_link) {
1755 mld_v1_process_querier_timers(mli);
1762 * Update the Older Version Querier Present timers for a link.
1763 * See Section 9.12 of RFC 3810.
1766 mld_v1_process_querier_timers(struct mld_ifsoftc *mli)
1771 if (mli->mli_version != MLD_VERSION_2 && --mli->mli_v1_timer == 0) {
1773 * MLDv1 Querier Present timer expired; revert to MLDv2.
1776 "%s: transition from v%d -> v%d on %p(%s)",
1777 __func__, mli->mli_version, MLD_VERSION_2,
1778 mli->mli_ifp, if_name(mli->mli_ifp));
1779 mli->mli_version = MLD_VERSION_2;
1784 * Transmit an MLDv1 report immediately.
1787 mld_v1_transmit_report(struct in6_multi *in6m, const int type)
1790 struct in6_ifaddr *ia;
1791 struct ip6_hdr *ip6;
1792 struct mbuf *mh, *md;
1793 struct mld_hdr *mld;
1795 IN6_MULTI_LIST_LOCK_ASSERT();
1798 ifp = in6m->in6m_ifp;
1799 /* in process of being freed */
1802 ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
1803 /* ia may be NULL if link-local address is tentative. */
1805 mh = m_gethdr(M_NOWAIT, MT_DATA);
1808 ifa_free(&ia->ia_ifa);
1811 md = m_get(M_NOWAIT, MT_DATA);
1815 ifa_free(&ia->ia_ifa);
1821 * FUTURE: Consider increasing alignment by ETHER_HDR_LEN, so
1822 * that ether_output() does not need to allocate another mbuf
1823 * for the header in the most common case.
1825 M_ALIGN(mh, sizeof(struct ip6_hdr));
1826 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
1827 mh->m_len = sizeof(struct ip6_hdr);
1829 ip6 = mtod(mh, struct ip6_hdr *);
1831 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
1832 ip6->ip6_vfc |= IPV6_VERSION;
1833 ip6->ip6_nxt = IPPROTO_ICMPV6;
1834 ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
1835 ip6->ip6_dst = in6m->in6m_addr;
1837 md->m_len = sizeof(struct mld_hdr);
1838 mld = mtod(md, struct mld_hdr *);
1839 mld->mld_type = type;
1842 mld->mld_maxdelay = 0;
1843 mld->mld_reserved = 0;
1844 mld->mld_addr = in6m->in6m_addr;
1845 in6_clearscope(&mld->mld_addr);
1846 mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
1847 sizeof(struct ip6_hdr), sizeof(struct mld_hdr));
1849 mld_save_context(mh, ifp);
1850 mh->m_flags |= M_MLDV1;
1852 mld_dispatch_packet(mh);
1855 ifa_free(&ia->ia_ifa);
1860 * Process a state change from the upper layer for the given IPv6 group.
1862 * Each socket holds a reference on the in_multi in its own ip_moptions.
1863 * The socket layer will have made the necessary updates to.the group
1864 * state, it is now up to MLD to issue a state change report if there
1865 * has been any change between T0 (when the last state-change was issued)
1868 * We use the MLDv2 state machine at group level. The MLd module
1869 * however makes the decision as to which MLD protocol version to speak.
1870 * A state change *from* INCLUDE {} always means an initial join.
1871 * A state change *to* INCLUDE {} always means a final leave.
1873 * If delay is non-zero, and the state change is an initial multicast
1874 * join, the state change report will be delayed by 'delay' ticks
1875 * in units of PR_FASTHZ if MLDv1 is active on the link; otherwise
1876 * the initial MLDv2 state change report will be delayed by whichever
1877 * is sooner, a pending state-change timer or delay itself.
1879 * VIMAGE: curvnet should have been set by caller, as this routine
1880 * is called from the socket option handlers.
1883 mld_change_state(struct in6_multi *inm, const int delay)
1885 struct mld_ifsoftc *mli;
1889 IN6_MULTI_LIST_LOCK_ASSERT();
1894 * Check if the in6_multi has already been disconnected.
1896 if (inm->in6m_ifp == NULL) {
1897 CTR1(KTR_MLD, "%s: inm is disconnected", __func__);
1902 * Try to detect if the upper layer just asked us to change state
1903 * for an interface which has now gone away.
1905 KASSERT(inm->in6m_ifma != NULL, ("%s: no ifma", __func__));
1906 ifp = inm->in6m_ifma->ifma_ifp;
1910 * Sanity check that netinet6's notion of ifp is the
1913 KASSERT(inm->in6m_ifp == ifp, ("%s: bad ifp", __func__));
1916 mli = MLD_IFINFO(ifp);
1917 KASSERT(mli != NULL, ("%s: no mld_ifsoftc for ifp %p", __func__, ifp));
1920 * If we detect a state transition to or from MCAST_UNDEFINED
1921 * for this group, then we are starting or finishing an MLD
1922 * life cycle for this group.
1924 if (inm->in6m_st[1].iss_fmode != inm->in6m_st[0].iss_fmode) {
1925 CTR3(KTR_MLD, "%s: inm transition %d -> %d", __func__,
1926 inm->in6m_st[0].iss_fmode, inm->in6m_st[1].iss_fmode);
1927 if (inm->in6m_st[0].iss_fmode == MCAST_UNDEFINED) {
1928 CTR1(KTR_MLD, "%s: initial join", __func__);
1929 error = mld_initial_join(inm, mli, delay);
1931 } else if (inm->in6m_st[1].iss_fmode == MCAST_UNDEFINED) {
1932 CTR1(KTR_MLD, "%s: final leave", __func__);
1933 mld_final_leave(inm, mli);
1937 CTR1(KTR_MLD, "%s: filter set change", __func__);
1940 error = mld_handle_state_change(inm, mli);
1948 * Perform the initial join for an MLD group.
1950 * When joining a group:
1951 * If the group should have its MLD traffic suppressed, do nothing.
1952 * MLDv1 starts sending MLDv1 host membership reports.
1953 * MLDv2 will schedule an MLDv2 state-change report containing the
1954 * initial state of the membership.
1956 * If the delay argument is non-zero, then we must delay sending the
1957 * initial state change for delay ticks (in units of PR_FASTHZ).
1960 mld_initial_join(struct in6_multi *inm, struct mld_ifsoftc *mli,
1965 int error, retval, syncstates;
1968 char ip6tbuf[INET6_ADDRSTRLEN];
1971 CTR4(KTR_MLD, "%s: initial join %s on ifp %p(%s)",
1972 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
1973 inm->in6m_ifp, if_name(inm->in6m_ifp));
1978 ifp = inm->in6m_ifp;
1980 IN6_MULTI_LIST_LOCK_ASSERT();
1983 KASSERT(mli && mli->mli_ifp == ifp, ("%s: inconsistent ifp", __func__));
1986 * Groups joined on loopback or marked as 'not reported',
1987 * enter the MLD_SILENT_MEMBER state and
1988 * are never reported in any protocol exchanges.
1989 * All other groups enter the appropriate state machine
1990 * for the version in use on this link.
1991 * A link marked as MLIF_SILENT causes MLD to be completely
1992 * disabled for the link.
1994 if ((ifp->if_flags & IFF_LOOPBACK) ||
1995 (mli->mli_flags & MLIF_SILENT) ||
1996 !mld_is_addr_reported(&inm->in6m_addr)) {
1998 "%s: not kicking state machine for silent group", __func__);
1999 inm->in6m_state = MLD_SILENT_MEMBER;
2000 inm->in6m_timer = 0;
2003 * Deal with overlapping in_multi lifecycle.
2004 * If this group was LEAVING, then make sure
2005 * we drop the reference we picked up to keep the
2006 * group around for the final INCLUDE {} enqueue.
2008 if (mli->mli_version == MLD_VERSION_2 &&
2009 inm->in6m_state == MLD_LEAVING_MEMBER) {
2010 inm->in6m_refcount--;
2011 MPASS(inm->in6m_refcount > 0);
2013 inm->in6m_state = MLD_REPORTING_MEMBER;
2015 switch (mli->mli_version) {
2018 * If a delay was provided, only use it if
2019 * it is greater than the delay normally
2020 * used for an MLDv1 state change report,
2021 * and delay sending the initial MLDv1 report
2022 * by not transitioning to the IDLE state.
2024 odelay = MLD_RANDOM_DELAY(MLD_V1_MAX_RI * PR_FASTHZ);
2026 inm->in6m_timer = max(delay, odelay);
2027 V_current_state_timers_running6 = 1;
2029 inm->in6m_state = MLD_IDLE_MEMBER;
2030 error = mld_v1_transmit_report(inm,
2031 MLD_LISTENER_REPORT);
2033 inm->in6m_timer = odelay;
2034 V_current_state_timers_running6 = 1;
2041 * Defer update of T0 to T1, until the first copy
2042 * of the state change has been transmitted.
2047 * Immediately enqueue a State-Change Report for
2048 * this interface, freeing any previous reports.
2049 * Don't kick the timers if there is nothing to do,
2050 * or if an error occurred.
2052 mq = &inm->in6m_scq;
2054 retval = mld_v2_enqueue_group_record(mq, inm, 1,
2055 0, 0, (mli->mli_flags & MLIF_USEALLOW));
2056 CTR2(KTR_MLD, "%s: enqueue record = %d",
2059 error = retval * -1;
2064 * Schedule transmission of pending state-change
2065 * report up to RV times for this link. The timer
2066 * will fire at the next mld_fasttimo (~200ms),
2067 * giving us an opportunity to merge the reports.
2069 * If a delay was provided to this function, only
2070 * use this delay if sooner than the existing one.
2072 KASSERT(mli->mli_rv > 1,
2073 ("%s: invalid robustness %d", __func__,
2075 inm->in6m_scrv = mli->mli_rv;
2077 if (inm->in6m_sctimer > 1) {
2079 min(inm->in6m_sctimer, delay);
2081 inm->in6m_sctimer = delay;
2083 inm->in6m_sctimer = 1;
2084 V_state_change_timers_running6 = 1;
2092 * Only update the T0 state if state change is atomic,
2093 * i.e. we don't need to wait for a timer to fire before we
2094 * can consider the state change to have been communicated.
2098 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
2099 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2100 if_name(inm->in6m_ifp));
2107 * Issue an intermediate state change during the life-cycle.
2110 mld_handle_state_change(struct in6_multi *inm, struct mld_ifsoftc *mli)
2115 char ip6tbuf[INET6_ADDRSTRLEN];
2118 CTR4(KTR_MLD, "%s: state change for %s on ifp %p(%s)",
2119 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2120 inm->in6m_ifp, if_name(inm->in6m_ifp));
2122 ifp = inm->in6m_ifp;
2124 IN6_MULTI_LIST_LOCK_ASSERT();
2127 KASSERT(mli && mli->mli_ifp == ifp,
2128 ("%s: inconsistent ifp", __func__));
2130 if ((ifp->if_flags & IFF_LOOPBACK) ||
2131 (mli->mli_flags & MLIF_SILENT) ||
2132 !mld_is_addr_reported(&inm->in6m_addr) ||
2133 (mli->mli_version != MLD_VERSION_2)) {
2134 if (!mld_is_addr_reported(&inm->in6m_addr)) {
2136 "%s: not kicking state machine for silent group", __func__);
2138 CTR1(KTR_MLD, "%s: nothing to do", __func__);
2140 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
2141 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2142 if_name(inm->in6m_ifp));
2146 mbufq_drain(&inm->in6m_scq);
2148 retval = mld_v2_enqueue_group_record(&inm->in6m_scq, inm, 1, 0, 0,
2149 (mli->mli_flags & MLIF_USEALLOW));
2150 CTR2(KTR_MLD, "%s: enqueue record = %d", __func__, retval);
2155 * If record(s) were enqueued, start the state-change
2156 * report timer for this group.
2158 inm->in6m_scrv = mli->mli_rv;
2159 inm->in6m_sctimer = 1;
2160 V_state_change_timers_running6 = 1;
2166 * Perform the final leave for a multicast address.
2168 * When leaving a group:
2169 * MLDv1 sends a DONE message, if and only if we are the reporter.
2170 * MLDv2 enqueues a state-change report containing a transition
2171 * to INCLUDE {} for immediate transmission.
2174 mld_final_leave(struct in6_multi *inm, struct mld_ifsoftc *mli)
2178 char ip6tbuf[INET6_ADDRSTRLEN];
2183 CTR4(KTR_MLD, "%s: final leave %s on ifp %p(%s)",
2184 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2185 inm->in6m_ifp, if_name(inm->in6m_ifp));
2187 IN6_MULTI_LIST_LOCK_ASSERT();
2190 switch (inm->in6m_state) {
2191 case MLD_NOT_MEMBER:
2192 case MLD_SILENT_MEMBER:
2193 case MLD_LEAVING_MEMBER:
2194 /* Already leaving or left; do nothing. */
2196 "%s: not kicking state machine for silent group", __func__);
2198 case MLD_REPORTING_MEMBER:
2199 case MLD_IDLE_MEMBER:
2200 case MLD_G_QUERY_PENDING_MEMBER:
2201 case MLD_SG_QUERY_PENDING_MEMBER:
2202 if (mli->mli_version == MLD_VERSION_1) {
2204 if (inm->in6m_state == MLD_G_QUERY_PENDING_MEMBER ||
2205 inm->in6m_state == MLD_SG_QUERY_PENDING_MEMBER)
2206 panic("%s: MLDv2 state reached, not MLDv2 mode",
2209 mld_v1_transmit_report(inm, MLD_LISTENER_DONE);
2210 inm->in6m_state = MLD_NOT_MEMBER;
2211 V_current_state_timers_running6 = 1;
2212 } else if (mli->mli_version == MLD_VERSION_2) {
2214 * Stop group timer and all pending reports.
2215 * Immediately enqueue a state-change report
2216 * TO_IN {} to be sent on the next fast timeout,
2217 * giving us an opportunity to merge reports.
2219 mbufq_drain(&inm->in6m_scq);
2220 inm->in6m_timer = 0;
2221 inm->in6m_scrv = mli->mli_rv;
2222 CTR4(KTR_MLD, "%s: Leaving %s/%s with %d "
2223 "pending retransmissions.", __func__,
2224 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2225 if_name(inm->in6m_ifp), inm->in6m_scrv);
2226 if (inm->in6m_scrv == 0) {
2227 inm->in6m_state = MLD_NOT_MEMBER;
2228 inm->in6m_sctimer = 0;
2232 in6m_acquire_locked(inm);
2234 retval = mld_v2_enqueue_group_record(
2235 &inm->in6m_scq, inm, 1, 0, 0,
2236 (mli->mli_flags & MLIF_USEALLOW));
2237 KASSERT(retval != 0,
2238 ("%s: enqueue record = %d", __func__,
2241 inm->in6m_state = MLD_LEAVING_MEMBER;
2242 inm->in6m_sctimer = 1;
2243 V_state_change_timers_running6 = 1;
2249 case MLD_LAZY_MEMBER:
2250 case MLD_SLEEPING_MEMBER:
2251 case MLD_AWAKENING_MEMBER:
2252 /* Our reports are suppressed; do nothing. */
2258 CTR3(KTR_MLD, "%s: T1 -> T0 for %s/%s", __func__,
2259 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2260 if_name(inm->in6m_ifp));
2261 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
2262 CTR3(KTR_MLD, "%s: T1 now MCAST_UNDEFINED for %p/%s",
2263 __func__, &inm->in6m_addr, if_name(inm->in6m_ifp));
2268 * Enqueue an MLDv2 group record to the given output queue.
2270 * If is_state_change is zero, a current-state record is appended.
2271 * If is_state_change is non-zero, a state-change report is appended.
2273 * If is_group_query is non-zero, an mbuf packet chain is allocated.
2274 * If is_group_query is zero, and if there is a packet with free space
2275 * at the tail of the queue, it will be appended to providing there
2276 * is enough free space.
2277 * Otherwise a new mbuf packet chain is allocated.
2279 * If is_source_query is non-zero, each source is checked to see if
2280 * it was recorded for a Group-Source query, and will be omitted if
2281 * it is not both in-mode and recorded.
2283 * If use_block_allow is non-zero, state change reports for initial join
2284 * and final leave, on an inclusive mode group with a source list, will be
2285 * rewritten to use the ALLOW_NEW and BLOCK_OLD record types, respectively.
2287 * The function will attempt to allocate leading space in the packet
2288 * for the IPv6+ICMP headers to be prepended without fragmenting the chain.
2290 * If successful the size of all data appended to the queue is returned,
2291 * otherwise an error code less than zero is returned, or zero if
2292 * no record(s) were appended.
2295 mld_v2_enqueue_group_record(struct mbufq *mq, struct in6_multi *inm,
2296 const int is_state_change, const int is_group_query,
2297 const int is_source_query, const int use_block_allow)
2299 struct mldv2_record mr;
2300 struct mldv2_record *pmr;
2302 struct ip6_msource *ims, *nims;
2303 struct mbuf *m0, *m, *md;
2304 int is_filter_list_change;
2305 int minrec0len, m0srcs, msrcs, nbytes, off;
2306 int record_has_sources;
2311 char ip6tbuf[INET6_ADDRSTRLEN];
2314 IN6_MULTI_LIST_LOCK_ASSERT();
2316 ifp = inm->in6m_ifp;
2317 is_filter_list_change = 0;
2324 record_has_sources = 1;
2326 type = MLD_DO_NOTHING;
2327 mode = inm->in6m_st[1].iss_fmode;
2330 * If we did not transition out of ASM mode during t0->t1,
2331 * and there are no source nodes to process, we can skip
2332 * the generation of source records.
2334 if (inm->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0 &&
2335 inm->in6m_nsrc == 0)
2336 record_has_sources = 0;
2338 if (is_state_change) {
2340 * Queue a state change record.
2341 * If the mode did not change, and there are non-ASM
2342 * listeners or source filters present,
2343 * we potentially need to issue two records for the group.
2344 * If there are ASM listeners, and there was no filter
2345 * mode transition of any kind, do nothing.
2347 * If we are transitioning to MCAST_UNDEFINED, we need
2348 * not send any sources. A transition to/from this state is
2349 * considered inclusive with some special treatment.
2351 * If we are rewriting initial joins/leaves to use
2352 * ALLOW/BLOCK, and the group's membership is inclusive,
2353 * we need to send sources in all cases.
2355 if (mode != inm->in6m_st[0].iss_fmode) {
2356 if (mode == MCAST_EXCLUDE) {
2357 CTR1(KTR_MLD, "%s: change to EXCLUDE",
2359 type = MLD_CHANGE_TO_EXCLUDE_MODE;
2361 CTR1(KTR_MLD, "%s: change to INCLUDE",
2363 if (use_block_allow) {
2366 * Here we're interested in state
2367 * edges either direction between
2368 * MCAST_UNDEFINED and MCAST_INCLUDE.
2369 * Perhaps we should just check
2370 * the group state, rather than
2373 if (mode == MCAST_UNDEFINED) {
2374 type = MLD_BLOCK_OLD_SOURCES;
2376 type = MLD_ALLOW_NEW_SOURCES;
2379 type = MLD_CHANGE_TO_INCLUDE_MODE;
2380 if (mode == MCAST_UNDEFINED)
2381 record_has_sources = 0;
2385 if (record_has_sources) {
2386 is_filter_list_change = 1;
2388 type = MLD_DO_NOTHING;
2393 * Queue a current state record.
2395 if (mode == MCAST_EXCLUDE) {
2396 type = MLD_MODE_IS_EXCLUDE;
2397 } else if (mode == MCAST_INCLUDE) {
2398 type = MLD_MODE_IS_INCLUDE;
2399 KASSERT(inm->in6m_st[1].iss_asm == 0,
2400 ("%s: inm %p is INCLUDE but ASM count is %d",
2401 __func__, inm, inm->in6m_st[1].iss_asm));
2406 * Generate the filter list changes using a separate function.
2408 if (is_filter_list_change)
2409 return (mld_v2_enqueue_filter_change(mq, inm));
2411 if (type == MLD_DO_NOTHING) {
2412 CTR3(KTR_MLD, "%s: nothing to do for %s/%s",
2413 __func__, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2414 if_name(inm->in6m_ifp));
2419 * If any sources are present, we must be able to fit at least
2420 * one in the trailing space of the tail packet's mbuf,
2423 minrec0len = sizeof(struct mldv2_record);
2424 if (record_has_sources)
2425 minrec0len += sizeof(struct in6_addr);
2427 CTR4(KTR_MLD, "%s: queueing %s for %s/%s", __func__,
2428 mld_rec_type_to_str(type),
2429 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2430 if_name(inm->in6m_ifp));
2433 * Check if we have a packet in the tail of the queue for this
2434 * group into which the first group record for this group will fit.
2435 * Otherwise allocate a new packet.
2436 * Always allocate leading space for IP6+RA+ICMPV6+REPORT.
2437 * Note: Group records for G/GSR query responses MUST be sent
2438 * in their own packet.
2440 m0 = mbufq_last(mq);
2441 if (!is_group_query &&
2443 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= MLD_V2_REPORT_MAXRECS) &&
2444 (m0->m_pkthdr.len + minrec0len) <
2445 (ifp->if_mtu - MLD_MTUSPACE)) {
2446 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
2447 sizeof(struct mldv2_record)) /
2448 sizeof(struct in6_addr);
2450 CTR1(KTR_MLD, "%s: use existing packet", __func__);
2452 if (mbufq_full(mq)) {
2453 CTR1(KTR_MLD, "%s: outbound queue full", __func__);
2457 m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
2458 sizeof(struct mldv2_record)) / sizeof(struct in6_addr);
2459 if (!is_state_change && !is_group_query)
2460 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2462 m = m_gethdr(M_NOWAIT, MT_DATA);
2466 mld_save_context(m, ifp);
2468 CTR1(KTR_MLD, "%s: allocated first packet", __func__);
2472 * Append group record.
2473 * If we have sources, we don't know how many yet.
2478 mr.mr_addr = inm->in6m_addr;
2479 in6_clearscope(&mr.mr_addr);
2480 if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) {
2483 CTR1(KTR_MLD, "%s: m_append() failed.", __func__);
2486 nbytes += sizeof(struct mldv2_record);
2489 * Append as many sources as will fit in the first packet.
2490 * If we are appending to a new packet, the chain allocation
2491 * may potentially use clusters; use m_getptr() in this case.
2492 * If we are appending to an existing packet, we need to obtain
2493 * a pointer to the group record after m_append(), in case a new
2494 * mbuf was allocated.
2496 * Only append sources which are in-mode at t1. If we are
2497 * transitioning to MCAST_UNDEFINED state on the group, and
2498 * use_block_allow is zero, do not include source entries.
2499 * Otherwise, we need to include this source in the report.
2501 * Only report recorded sources in our filter set when responding
2502 * to a group-source query.
2504 if (record_has_sources) {
2507 pmr = (struct mldv2_record *)(mtod(md, uint8_t *) +
2508 md->m_len - nbytes);
2510 md = m_getptr(m, 0, &off);
2511 pmr = (struct mldv2_record *)(mtod(md, uint8_t *) +
2515 RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs,
2517 CTR2(KTR_MLD, "%s: visit node %s", __func__,
2518 ip6_sprintf(ip6tbuf, &ims->im6s_addr));
2519 now = im6s_get_mode(inm, ims, 1);
2520 CTR2(KTR_MLD, "%s: node is %d", __func__, now);
2521 if ((now != mode) ||
2523 (!use_block_allow && mode == MCAST_UNDEFINED))) {
2524 CTR1(KTR_MLD, "%s: skip node", __func__);
2527 if (is_source_query && ims->im6s_stp == 0) {
2528 CTR1(KTR_MLD, "%s: skip unrecorded node",
2532 CTR1(KTR_MLD, "%s: append node", __func__);
2533 if (!m_append(m, sizeof(struct in6_addr),
2534 (void *)&ims->im6s_addr)) {
2537 CTR1(KTR_MLD, "%s: m_append() failed.",
2541 nbytes += sizeof(struct in6_addr);
2543 if (msrcs == m0srcs)
2546 CTR2(KTR_MLD, "%s: msrcs is %d this packet", __func__,
2548 pmr->mr_numsrc = htons(msrcs);
2549 nbytes += (msrcs * sizeof(struct in6_addr));
2552 if (is_source_query && msrcs == 0) {
2553 CTR1(KTR_MLD, "%s: no recorded sources to report", __func__);
2560 * We are good to go with first packet.
2563 CTR1(KTR_MLD, "%s: enqueueing first packet", __func__);
2564 m->m_pkthdr.PH_vt.vt_nrecs = 1;
2565 mbufq_enqueue(mq, m);
2567 m->m_pkthdr.PH_vt.vt_nrecs++;
2570 * No further work needed if no source list in packet(s).
2572 if (!record_has_sources)
2576 * Whilst sources remain to be announced, we need to allocate
2577 * a new packet and fill out as many sources as will fit.
2578 * Always try for a cluster first.
2580 while (nims != NULL) {
2581 if (mbufq_full(mq)) {
2582 CTR1(KTR_MLD, "%s: outbound queue full", __func__);
2585 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2587 m = m_gethdr(M_NOWAIT, MT_DATA);
2590 mld_save_context(m, ifp);
2591 md = m_getptr(m, 0, &off);
2592 pmr = (struct mldv2_record *)(mtod(md, uint8_t *) + off);
2593 CTR1(KTR_MLD, "%s: allocated next packet", __func__);
2595 if (!m_append(m, sizeof(struct mldv2_record), (void *)&mr)) {
2598 CTR1(KTR_MLD, "%s: m_append() failed.", __func__);
2601 m->m_pkthdr.PH_vt.vt_nrecs = 1;
2602 nbytes += sizeof(struct mldv2_record);
2604 m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
2605 sizeof(struct mldv2_record)) / sizeof(struct in6_addr);
2608 RB_FOREACH_FROM(ims, ip6_msource_tree, nims) {
2609 CTR2(KTR_MLD, "%s: visit node %s",
2610 __func__, ip6_sprintf(ip6tbuf, &ims->im6s_addr));
2611 now = im6s_get_mode(inm, ims, 1);
2612 if ((now != mode) ||
2614 (!use_block_allow && mode == MCAST_UNDEFINED))) {
2615 CTR1(KTR_MLD, "%s: skip node", __func__);
2618 if (is_source_query && ims->im6s_stp == 0) {
2619 CTR1(KTR_MLD, "%s: skip unrecorded node",
2623 CTR1(KTR_MLD, "%s: append node", __func__);
2624 if (!m_append(m, sizeof(struct in6_addr),
2625 (void *)&ims->im6s_addr)) {
2628 CTR1(KTR_MLD, "%s: m_append() failed.",
2633 if (msrcs == m0srcs)
2636 pmr->mr_numsrc = htons(msrcs);
2637 nbytes += (msrcs * sizeof(struct in6_addr));
2639 CTR1(KTR_MLD, "%s: enqueueing next packet", __func__);
2640 mbufq_enqueue(mq, m);
2647 * Type used to mark record pass completion.
2648 * We exploit the fact we can cast to this easily from the
2649 * current filter modes on each ip_msource node.
2652 REC_NONE = 0x00, /* MCAST_UNDEFINED */
2653 REC_ALLOW = 0x01, /* MCAST_INCLUDE */
2654 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */
2655 REC_FULL = REC_ALLOW | REC_BLOCK
2659 * Enqueue an MLDv2 filter list change to the given output queue.
2661 * Source list filter state is held in an RB-tree. When the filter list
2662 * for a group is changed without changing its mode, we need to compute
2663 * the deltas between T0 and T1 for each source in the filter set,
2664 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records.
2666 * As we may potentially queue two record types, and the entire R-B tree
2667 * needs to be walked at once, we break this out into its own function
2668 * so we can generate a tightly packed queue of packets.
2670 * XXX This could be written to only use one tree walk, although that makes
2671 * serializing into the mbuf chains a bit harder. For now we do two walks
2672 * which makes things easier on us, and it may or may not be harder on
2675 * If successful the size of all data appended to the queue is returned,
2676 * otherwise an error code less than zero is returned, or zero if
2677 * no record(s) were appended.
2680 mld_v2_enqueue_filter_change(struct mbufq *mq, struct in6_multi *inm)
2682 static const int MINRECLEN =
2683 sizeof(struct mldv2_record) + sizeof(struct in6_addr);
2685 struct mldv2_record mr;
2686 struct mldv2_record *pmr;
2687 struct ip6_msource *ims, *nims;
2688 struct mbuf *m, *m0, *md;
2689 int m0srcs, nbytes, npbytes, off, rsrcs, schanged;
2691 uint8_t mode, now, then;
2692 rectype_t crt, drt, nrt;
2694 char ip6tbuf[INET6_ADDRSTRLEN];
2697 IN6_MULTI_LIST_LOCK_ASSERT();
2699 if (inm->in6m_nsrc == 0 ||
2700 (inm->in6m_st[0].iss_asm > 0 && inm->in6m_st[1].iss_asm > 0))
2703 ifp = inm->in6m_ifp; /* interface */
2704 mode = inm->in6m_st[1].iss_fmode; /* filter mode at t1 */
2705 crt = REC_NONE; /* current group record type */
2706 drt = REC_NONE; /* mask of completed group record types */
2707 nrt = REC_NONE; /* record type for current node */
2708 m0srcs = 0; /* # source which will fit in current mbuf chain */
2709 npbytes = 0; /* # of bytes appended this packet */
2710 nbytes = 0; /* # of bytes appended to group's state-change queue */
2711 rsrcs = 0; /* # sources encoded in current record */
2712 schanged = 0; /* # nodes encoded in overall filter change */
2713 nallow = 0; /* # of source entries in ALLOW_NEW */
2714 nblock = 0; /* # of source entries in BLOCK_OLD */
2715 nims = NULL; /* next tree node pointer */
2718 * For each possible filter record mode.
2719 * The first kind of source we encounter tells us which
2720 * is the first kind of record we start appending.
2721 * If a node transitioned to UNDEFINED at t1, its mode is treated
2722 * as the inverse of the group's filter mode.
2724 while (drt != REC_FULL) {
2726 m0 = mbufq_last(mq);
2728 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <=
2729 MLD_V2_REPORT_MAXRECS) &&
2730 (m0->m_pkthdr.len + MINRECLEN) <
2731 (ifp->if_mtu - MLD_MTUSPACE)) {
2733 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len -
2734 sizeof(struct mldv2_record)) /
2735 sizeof(struct in6_addr);
2737 "%s: use previous packet", __func__);
2739 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2741 m = m_gethdr(M_NOWAIT, MT_DATA);
2744 "%s: m_get*() failed", __func__);
2747 m->m_pkthdr.PH_vt.vt_nrecs = 0;
2748 mld_save_context(m, ifp);
2749 m0srcs = (ifp->if_mtu - MLD_MTUSPACE -
2750 sizeof(struct mldv2_record)) /
2751 sizeof(struct in6_addr);
2754 "%s: allocated new packet", __func__);
2757 * Append the MLD group record header to the
2758 * current packet's data area.
2759 * Recalculate pointer to free space for next
2760 * group record, in case m_append() allocated
2761 * a new mbuf or cluster.
2763 memset(&mr, 0, sizeof(mr));
2764 mr.mr_addr = inm->in6m_addr;
2765 in6_clearscope(&mr.mr_addr);
2766 if (!m_append(m, sizeof(mr), (void *)&mr)) {
2770 "%s: m_append() failed", __func__);
2773 npbytes += sizeof(struct mldv2_record);
2775 /* new packet; offset in chain */
2776 md = m_getptr(m, npbytes -
2777 sizeof(struct mldv2_record), &off);
2778 pmr = (struct mldv2_record *)(mtod(md,
2781 /* current packet; offset from last append */
2783 pmr = (struct mldv2_record *)(mtod(md,
2784 uint8_t *) + md->m_len -
2785 sizeof(struct mldv2_record));
2788 * Begin walking the tree for this record type
2789 * pass, or continue from where we left off
2790 * previously if we had to allocate a new packet.
2791 * Only report deltas in-mode at t1.
2792 * We need not report included sources as allowed
2793 * if we are in inclusive mode on the group,
2794 * however the converse is not true.
2798 nims = RB_MIN(ip6_msource_tree,
2801 RB_FOREACH_FROM(ims, ip6_msource_tree, nims) {
2802 CTR2(KTR_MLD, "%s: visit node %s", __func__,
2803 ip6_sprintf(ip6tbuf, &ims->im6s_addr));
2804 now = im6s_get_mode(inm, ims, 1);
2805 then = im6s_get_mode(inm, ims, 0);
2806 CTR3(KTR_MLD, "%s: mode: t0 %d, t1 %d",
2807 __func__, then, now);
2810 "%s: skip unchanged", __func__);
2813 if (mode == MCAST_EXCLUDE &&
2814 now == MCAST_INCLUDE) {
2816 "%s: skip IN src on EX group",
2820 nrt = (rectype_t)now;
2821 if (nrt == REC_NONE)
2822 nrt = (rectype_t)(~mode & REC_FULL);
2823 if (schanged++ == 0) {
2825 } else if (crt != nrt)
2827 if (!m_append(m, sizeof(struct in6_addr),
2828 (void *)&ims->im6s_addr)) {
2832 "%s: m_append() failed", __func__);
2835 nallow += !!(crt == REC_ALLOW);
2836 nblock += !!(crt == REC_BLOCK);
2837 if (++rsrcs == m0srcs)
2841 * If we did not append any tree nodes on this
2842 * pass, back out of allocations.
2845 npbytes -= sizeof(struct mldv2_record);
2848 "%s: m_free(m)", __func__);
2852 "%s: m_adj(m, -mr)", __func__);
2853 m_adj(m, -((int)sizeof(
2854 struct mldv2_record)));
2858 npbytes += (rsrcs * sizeof(struct in6_addr));
2859 if (crt == REC_ALLOW)
2860 pmr->mr_type = MLD_ALLOW_NEW_SOURCES;
2861 else if (crt == REC_BLOCK)
2862 pmr->mr_type = MLD_BLOCK_OLD_SOURCES;
2863 pmr->mr_numsrc = htons(rsrcs);
2865 * Count the new group record, and enqueue this
2866 * packet if it wasn't already queued.
2868 m->m_pkthdr.PH_vt.vt_nrecs++;
2870 mbufq_enqueue(mq, m);
2872 } while (nims != NULL);
2874 crt = (~crt & REC_FULL);
2877 CTR3(KTR_MLD, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__,
2884 mld_v2_merge_state_changes(struct in6_multi *inm, struct mbufq *scq)
2887 struct mbuf *m; /* pending state-change */
2888 struct mbuf *m0; /* copy of pending state-change */
2889 struct mbuf *mt; /* last state-change in packet */
2890 int docopy, domerge;
2897 IN6_MULTI_LIST_LOCK_ASSERT();
2901 * If there are further pending retransmissions, make a writable
2902 * copy of each queued state-change message before merging.
2904 if (inm->in6m_scrv > 0)
2907 gq = &inm->in6m_scq;
2909 if (mbufq_first(gq) == NULL) {
2910 CTR2(KTR_MLD, "%s: WARNING: queue for inm %p is empty",
2915 m = mbufq_first(gq);
2918 * Only merge the report into the current packet if
2919 * there is sufficient space to do so; an MLDv2 report
2920 * packet may only contain 65,535 group records.
2921 * Always use a simple mbuf chain concatentation to do this,
2922 * as large state changes for single groups may have
2923 * allocated clusters.
2926 mt = mbufq_last(scq);
2928 recslen = m_length(m, NULL);
2930 if ((mt->m_pkthdr.PH_vt.vt_nrecs +
2931 m->m_pkthdr.PH_vt.vt_nrecs <=
2932 MLD_V2_REPORT_MAXRECS) &&
2933 (mt->m_pkthdr.len + recslen <=
2934 (inm->in6m_ifp->if_mtu - MLD_MTUSPACE)))
2938 if (!domerge && mbufq_full(gq)) {
2940 "%s: outbound queue full, skipping whole packet %p",
2950 CTR2(KTR_MLD, "%s: dequeueing %p", __func__, m);
2951 m0 = mbufq_dequeue(gq);
2954 CTR2(KTR_MLD, "%s: copying %p", __func__, m);
2955 m0 = m_dup(m, M_NOWAIT);
2958 m0->m_nextpkt = NULL;
2963 CTR3(KTR_MLD, "%s: queueing %p to scq %p)",
2965 mbufq_enqueue(scq, m0);
2967 struct mbuf *mtl; /* last mbuf of packet mt */
2969 CTR3(KTR_MLD, "%s: merging %p with ifscq tail %p)",
2973 m0->m_flags &= ~M_PKTHDR;
2974 mt->m_pkthdr.len += recslen;
2975 mt->m_pkthdr.PH_vt.vt_nrecs +=
2976 m0->m_pkthdr.PH_vt.vt_nrecs;
2986 * Respond to a pending MLDv2 General Query.
2989 mld_v2_dispatch_general_query(struct mld_ifsoftc *mli)
2991 struct ifmultiaddr *ifma;
2993 struct in6_multi *inm;
2997 IN6_MULTI_LIST_LOCK_ASSERT();
3000 KASSERT(mli->mli_version == MLD_VERSION_2,
3001 ("%s: called when version %d", __func__, mli->mli_version));
3004 * Check that there are some packets queued. If so, send them first.
3005 * For large number of groups the reply to general query can take
3006 * many packets, we should finish sending them before starting of
3007 * queuing the new reply.
3009 if (mbufq_len(&mli->mli_gq) != 0)
3014 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
3015 inm = in6m_ifmultiaddr_get_inm(ifma);
3018 KASSERT(ifp == inm->in6m_ifp,
3019 ("%s: inconsistent ifp", __func__));
3021 switch (inm->in6m_state) {
3022 case MLD_NOT_MEMBER:
3023 case MLD_SILENT_MEMBER:
3025 case MLD_REPORTING_MEMBER:
3026 case MLD_IDLE_MEMBER:
3027 case MLD_LAZY_MEMBER:
3028 case MLD_SLEEPING_MEMBER:
3029 case MLD_AWAKENING_MEMBER:
3030 inm->in6m_state = MLD_REPORTING_MEMBER;
3031 retval = mld_v2_enqueue_group_record(&mli->mli_gq,
3033 CTR2(KTR_MLD, "%s: enqueue record = %d",
3036 case MLD_G_QUERY_PENDING_MEMBER:
3037 case MLD_SG_QUERY_PENDING_MEMBER:
3038 case MLD_LEAVING_MEMBER:
3044 mld_dispatch_queue(&mli->mli_gq, MLD_MAX_RESPONSE_BURST);
3047 * Slew transmission of bursts over 500ms intervals.
3049 if (mbufq_first(&mli->mli_gq) != NULL) {
3050 mli->mli_v2_timer = 1 + MLD_RANDOM_DELAY(
3051 MLD_RESPONSE_BURST_INTERVAL);
3052 V_interface_timers_running6 = 1;
3057 * Transmit the next pending message in the output queue.
3059 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis.
3060 * MRT: Nothing needs to be done, as MLD traffic is always local to
3061 * a link and uses a link-scope multicast address.
3064 mld_dispatch_packet(struct mbuf *m)
3066 struct ip6_moptions im6o;
3071 struct ip6_hdr *ip6;
3072 struct mld_hdr *mld;
3078 CTR2(KTR_MLD, "%s: transmit %p", __func__, m);
3081 * Set VNET image pointer from enqueued mbuf chain
3082 * before doing anything else. Whilst we use interface
3083 * indexes to guard against interface detach, they are
3084 * unique to each VIMAGE and must be retrieved.
3086 ifindex = mld_restore_context(m);
3089 * Check if the ifnet still exists. This limits the scope of
3090 * any race in the absence of a global ifp lock for low cost
3091 * (an array lookup).
3093 ifp = ifnet_byindex(ifindex);
3095 CTR3(KTR_MLD, "%s: dropped %p as ifindex %u went away.",
3096 __func__, m, ifindex);
3098 IP6STAT_INC(ip6s_noroute);
3102 im6o.im6o_multicast_hlim = 1;
3103 im6o.im6o_multicast_loop = (V_ip6_mrouter != NULL);
3104 im6o.im6o_multicast_ifp = ifp;
3106 if (m->m_flags & M_MLDV1) {
3109 m0 = mld_v2_encap_report(ifp, m);
3111 CTR2(KTR_MLD, "%s: dropped %p", __func__, m);
3112 IP6STAT_INC(ip6s_odropped);
3117 mld_scrub_context(m0);
3119 m0->m_pkthdr.rcvif = V_loif;
3121 ip6 = mtod(m0, struct ip6_hdr *);
3123 (void)in6_setscope(&ip6->ip6_dst, ifp, NULL); /* XXX LOR */
3126 * XXX XXX Break some KPI rules to prevent an LOR which would
3127 * occur if we called in6_setscope() at transmission.
3128 * See comments at top of file.
3130 MLD_EMBEDSCOPE(&ip6->ip6_dst, ifp->if_index);
3134 * Retrieve the ICMPv6 type before handoff to ip6_output(),
3135 * so we can bump the stats.
3137 md = m_getptr(m0, sizeof(struct ip6_hdr), &off);
3138 mld = (struct mld_hdr *)(mtod(md, uint8_t *) + off);
3139 type = mld->mld_type;
3141 error = ip6_output(m0, &mld_po, NULL, IPV6_UNSPECSRC, &im6o,
3144 CTR3(KTR_MLD, "%s: ip6_output(%p) = %d", __func__, m0, error);
3147 ICMP6STAT_INC(icp6s_outhist[type]);
3149 icmp6_ifstat_inc(oifp, ifs6_out_msg);
3151 case MLD_LISTENER_REPORT:
3152 case MLDV2_LISTENER_REPORT:
3153 icmp6_ifstat_inc(oifp, ifs6_out_mldreport);
3155 case MLD_LISTENER_DONE:
3156 icmp6_ifstat_inc(oifp, ifs6_out_mlddone);
3165 * Encapsulate an MLDv2 report.
3167 * KAME IPv6 requires that hop-by-hop options be passed separately,
3168 * and that the IPv6 header be prepended in a separate mbuf.
3170 * Returns a pointer to the new mbuf chain head, or NULL if the
3171 * allocation failed.
3173 static struct mbuf *
3174 mld_v2_encap_report(struct ifnet *ifp, struct mbuf *m)
3177 struct mldv2_report *mld;
3178 struct ip6_hdr *ip6;
3179 struct in6_ifaddr *ia;
3182 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
3183 KASSERT((m->m_flags & M_PKTHDR),
3184 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m));
3187 * RFC3590: OK to send as :: or tentative during DAD.
3189 ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
3191 CTR1(KTR_MLD, "%s: warning: ia is NULL", __func__);
3193 mh = m_gethdr(M_NOWAIT, MT_DATA);
3196 ifa_free(&ia->ia_ifa);
3200 M_ALIGN(mh, sizeof(struct ip6_hdr) + sizeof(struct mldv2_report));
3202 mldreclen = m_length(m, NULL);
3203 CTR2(KTR_MLD, "%s: mldreclen is %d", __func__, mldreclen);
3205 mh->m_len = sizeof(struct ip6_hdr) + sizeof(struct mldv2_report);
3206 mh->m_pkthdr.len = sizeof(struct ip6_hdr) +
3207 sizeof(struct mldv2_report) + mldreclen;
3209 ip6 = mtod(mh, struct ip6_hdr *);
3211 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
3212 ip6->ip6_vfc |= IPV6_VERSION;
3213 ip6->ip6_nxt = IPPROTO_ICMPV6;
3214 ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
3216 ifa_free(&ia->ia_ifa);
3217 ip6->ip6_dst = in6addr_linklocal_allv2routers;
3218 /* scope ID will be set in netisr */
3220 mld = (struct mldv2_report *)(ip6 + 1);
3221 mld->mld_type = MLDV2_LISTENER_REPORT;
3224 mld->mld_v2_reserved = 0;
3225 mld->mld_v2_numrecs = htons(m->m_pkthdr.PH_vt.vt_nrecs);
3226 m->m_pkthdr.PH_vt.vt_nrecs = 0;
3229 mld->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
3230 sizeof(struct ip6_hdr), sizeof(struct mldv2_report) + mldreclen);
3236 mld_rec_type_to_str(const int type)
3240 case MLD_CHANGE_TO_EXCLUDE_MODE:
3243 case MLD_CHANGE_TO_INCLUDE_MODE:
3246 case MLD_MODE_IS_EXCLUDE:
3249 case MLD_MODE_IS_INCLUDE:
3252 case MLD_ALLOW_NEW_SOURCES:
3255 case MLD_BLOCK_OLD_SOURCES:
3266 mld_init(void *unused __unused)
3269 CTR1(KTR_MLD, "%s: initializing", __func__);
3272 ip6_initpktopts(&mld_po);
3273 mld_po.ip6po_hlim = 1;
3274 mld_po.ip6po_hbh = &mld_ra.hbh;
3275 mld_po.ip6po_prefer_tempaddr = IP6PO_TEMPADDR_NOTPREFER;
3276 mld_po.ip6po_flags = IP6PO_DONTFRAG;
3278 SYSINIT(mld_init, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE, mld_init, NULL);
3281 mld_uninit(void *unused __unused)
3284 CTR1(KTR_MLD, "%s: tearing down", __func__);
3287 SYSUNINIT(mld_uninit, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE, mld_uninit, NULL);
3290 vnet_mld_init(const void *unused __unused)
3293 CTR1(KTR_MLD, "%s: initializing", __func__);
3295 LIST_INIT(&V_mli_head);
3297 VNET_SYSINIT(vnet_mld_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, vnet_mld_init,
3301 vnet_mld_uninit(const void *unused __unused)
3304 /* This can happen if we shutdown the network stack. */
3305 CTR1(KTR_MLD, "%s: tearing down", __func__);
3307 VNET_SYSUNINIT(vnet_mld_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, vnet_mld_uninit,
3311 mld_modevent(module_t mod, int type, void *unused __unused)
3319 return (EOPNOTSUPP);
3324 static moduledata_t mld_mod = {
3329 DECLARE_MODULE(mld, mld_mod, SI_SUB_PROTO_MC, SI_ORDER_ANY);