2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2009 Bruce Simpson.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote
16 * products derived from this software without specific prior written
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * IPv6 multicast socket, group, and socket option processing module.
34 * Normative references: RFC 2292, RFC 3492, RFC 3542, RFC 3678, RFC 3810.
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include "opt_inet6.h"
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/gtaskqueue.h>
45 #include <sys/kernel.h>
46 #include <sys/malloc.h>
48 #include <sys/protosw.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/sysctl.h>
57 #include <net/if_var.h>
58 #include <net/if_dl.h>
59 #include <net/route.h>
63 #include <netinet/in.h>
64 #include <netinet/udp.h>
65 #include <netinet/in_var.h>
66 #include <netinet/ip_var.h>
67 #include <netinet/udp_var.h>
68 #include <netinet6/in6_fib.h>
69 #include <netinet6/in6_var.h>
70 #include <netinet/ip6.h>
71 #include <netinet/icmp6.h>
72 #include <netinet6/ip6_var.h>
73 #include <netinet/in_pcb.h>
74 #include <netinet/tcp_var.h>
75 #include <netinet6/nd6.h>
76 #include <netinet6/mld6_var.h>
77 #include <netinet6/scope6_var.h>
80 #define KTR_MLD KTR_INET6
83 #ifndef __SOCKUNION_DECLARED
85 struct sockaddr_storage ss;
87 struct sockaddr_dl sdl;
88 struct sockaddr_in6 sin6;
90 typedef union sockunion sockunion_t;
91 #define __SOCKUNION_DECLARED
92 #endif /* __SOCKUNION_DECLARED */
94 static MALLOC_DEFINE(M_IN6MFILTER, "in6_mfilter",
95 "IPv6 multicast PCB-layer source filter");
96 MALLOC_DEFINE(M_IP6MADDR, "in6_multi", "IPv6 multicast group");
97 static MALLOC_DEFINE(M_IP6MOPTS, "ip6_moptions", "IPv6 multicast options");
98 static MALLOC_DEFINE(M_IP6MSOURCE, "ip6_msource",
99 "IPv6 multicast MLD-layer source filter");
101 RB_GENERATE(ip6_msource_tree, ip6_msource, im6s_link, ip6_msource_cmp);
105 * - Lock order is: Giant, INP_WLOCK, IN6_MULTI_LOCK, MLD_LOCK, IF_ADDR_LOCK.
106 * - The IF_ADDR_LOCK is implicitly taken by in6m_lookup() earlier, however
107 * it can be taken by code in net/if.c also.
108 * - ip6_moptions and in6_mfilter are covered by the INP_WLOCK.
110 * struct in6_multi is covered by IN6_MULTI_LOCK. There isn't strictly
111 * any need for in6_multi itself to be virtualized -- it is bound to an ifp
112 * anyway no matter what happens.
114 struct mtx in6_multi_list_mtx;
115 MTX_SYSINIT(in6_multi_mtx, &in6_multi_list_mtx, "in6_multi_list_mtx", MTX_DEF);
117 struct mtx in6_multi_free_mtx;
118 MTX_SYSINIT(in6_multi_free_mtx, &in6_multi_free_mtx, "in6_multi_free_mtx", MTX_DEF);
120 struct sx in6_multi_sx;
121 SX_SYSINIT(in6_multi_sx, &in6_multi_sx, "in6_multi_sx");
125 static void im6f_commit(struct in6_mfilter *);
126 static int im6f_get_source(struct in6_mfilter *imf,
127 const struct sockaddr_in6 *psin,
128 struct in6_msource **);
129 static struct in6_msource *
130 im6f_graft(struct in6_mfilter *, const uint8_t,
131 const struct sockaddr_in6 *);
132 static void im6f_leave(struct in6_mfilter *);
133 static int im6f_prune(struct in6_mfilter *, const struct sockaddr_in6 *);
134 static void im6f_purge(struct in6_mfilter *);
135 static void im6f_rollback(struct in6_mfilter *);
136 static void im6f_reap(struct in6_mfilter *);
137 static int im6o_grow(struct ip6_moptions *);
138 static size_t im6o_match_group(const struct ip6_moptions *,
139 const struct ifnet *, const struct sockaddr *);
140 static struct in6_msource *
141 im6o_match_source(const struct ip6_moptions *, const size_t,
142 const struct sockaddr *);
143 static void im6s_merge(struct ip6_msource *ims,
144 const struct in6_msource *lims, const int rollback);
145 static int in6_getmulti(struct ifnet *, const struct in6_addr *,
146 struct in6_multi **);
147 static int in6m_get_source(struct in6_multi *inm,
148 const struct in6_addr *addr, const int noalloc,
149 struct ip6_msource **pims);
151 static int in6m_is_ifp_detached(const struct in6_multi *);
153 static int in6m_merge(struct in6_multi *, /*const*/ struct in6_mfilter *);
154 static void in6m_purge(struct in6_multi *);
155 static void in6m_reap(struct in6_multi *);
156 static struct ip6_moptions *
157 in6p_findmoptions(struct inpcb *);
158 static int in6p_get_source_filters(struct inpcb *, struct sockopt *);
159 static int in6p_join_group(struct inpcb *, struct sockopt *);
160 static int in6p_leave_group(struct inpcb *, struct sockopt *);
161 static struct ifnet *
162 in6p_lookup_mcast_ifp(const struct inpcb *,
163 const struct sockaddr_in6 *);
164 static int in6p_block_unblock_source(struct inpcb *, struct sockopt *);
165 static int in6p_set_multicast_if(struct inpcb *, struct sockopt *);
166 static int in6p_set_source_filters(struct inpcb *, struct sockopt *);
167 static int sysctl_ip6_mcast_filters(SYSCTL_HANDLER_ARGS);
169 SYSCTL_DECL(_net_inet6_ip6); /* XXX Not in any common header. */
171 static SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, mcast, CTLFLAG_RW, 0,
174 static u_long in6_mcast_maxgrpsrc = IPV6_MAX_GROUP_SRC_FILTER;
175 SYSCTL_ULONG(_net_inet6_ip6_mcast, OID_AUTO, maxgrpsrc,
176 CTLFLAG_RWTUN, &in6_mcast_maxgrpsrc, 0,
177 "Max source filters per group");
179 static u_long in6_mcast_maxsocksrc = IPV6_MAX_SOCK_SRC_FILTER;
180 SYSCTL_ULONG(_net_inet6_ip6_mcast, OID_AUTO, maxsocksrc,
181 CTLFLAG_RWTUN, &in6_mcast_maxsocksrc, 0,
182 "Max source filters per socket");
184 /* TODO Virtualize this switch. */
185 int in6_mcast_loop = IPV6_DEFAULT_MULTICAST_LOOP;
186 SYSCTL_INT(_net_inet6_ip6_mcast, OID_AUTO, loop, CTLFLAG_RWTUN,
187 &in6_mcast_loop, 0, "Loopback multicast datagrams by default");
189 static SYSCTL_NODE(_net_inet6_ip6_mcast, OID_AUTO, filters,
190 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ip6_mcast_filters,
191 "Per-interface stack-wide source filters");
193 int ifma6_restart = 0;
196 * Inline function which wraps assertions for a valid ifp.
197 * The ifnet layer will set the ifma's ifp pointer to NULL if the ifp
201 in6m_is_ifp_detached(const struct in6_multi *inm)
205 KASSERT(inm->in6m_ifma != NULL, ("%s: no ifma", __func__));
206 ifp = inm->in6m_ifma->ifma_ifp;
209 * Sanity check that network-layer notion of ifp is the
210 * same as that of link-layer.
212 KASSERT(inm->in6m_ifp == ifp, ("%s: bad ifp", __func__));
215 return (ifp == NULL);
220 * Initialize an in6_mfilter structure to a known state at t0, t1
221 * with an empty source filter list.
224 im6f_init(struct in6_mfilter *imf, const int st0, const int st1)
226 memset(imf, 0, sizeof(struct in6_mfilter));
227 RB_INIT(&imf->im6f_sources);
228 imf->im6f_st[0] = st0;
229 imf->im6f_st[1] = st1;
233 * Resize the ip6_moptions vector to the next power-of-two minus 1.
234 * May be called with locks held; do not sleep.
237 im6o_grow(struct ip6_moptions *imo)
239 struct in6_multi **nmships;
240 struct in6_multi **omships;
241 struct in6_mfilter *nmfilters;
242 struct in6_mfilter *omfilters;
249 omships = imo->im6o_membership;
250 omfilters = imo->im6o_mfilters;
251 oldmax = imo->im6o_max_memberships;
252 newmax = ((oldmax + 1) * 2) - 1;
254 if (newmax <= IPV6_MAX_MEMBERSHIPS) {
255 nmships = (struct in6_multi **)realloc(omships,
256 sizeof(struct in6_multi *) * newmax, M_IP6MOPTS, M_NOWAIT);
257 nmfilters = (struct in6_mfilter *)realloc(omfilters,
258 sizeof(struct in6_mfilter) * newmax, M_IN6MFILTER,
260 if (nmships != NULL && nmfilters != NULL) {
261 /* Initialize newly allocated source filter heads. */
262 for (idx = oldmax; idx < newmax; idx++) {
263 im6f_init(&nmfilters[idx], MCAST_UNDEFINED,
266 imo->im6o_max_memberships = newmax;
267 imo->im6o_membership = nmships;
268 imo->im6o_mfilters = nmfilters;
272 if (nmships == NULL || nmfilters == NULL) {
274 free(nmships, M_IP6MOPTS);
275 if (nmfilters != NULL)
276 free(nmfilters, M_IN6MFILTER);
277 return (ETOOMANYREFS);
284 * Find an IPv6 multicast group entry for this ip6_moptions instance
285 * which matches the specified group, and optionally an interface.
286 * Return its index into the array, or -1 if not found.
289 im6o_match_group(const struct ip6_moptions *imo, const struct ifnet *ifp,
290 const struct sockaddr *group)
292 const struct sockaddr_in6 *gsin6;
293 struct in6_multi **pinm;
297 gsin6 = (const struct sockaddr_in6 *)group;
299 /* The im6o_membership array may be lazy allocated. */
300 if (imo->im6o_membership == NULL || imo->im6o_num_memberships == 0)
303 nmships = imo->im6o_num_memberships;
304 pinm = &imo->im6o_membership[0];
305 for (idx = 0; idx < nmships; idx++, pinm++) {
308 if ((ifp == NULL || ((*pinm)->in6m_ifp == ifp)) &&
309 IN6_ARE_ADDR_EQUAL(&(*pinm)->in6m_addr,
310 &gsin6->sin6_addr)) {
321 * Find an IPv6 multicast source entry for this imo which matches
322 * the given group index for this socket, and source address.
324 * XXX TODO: The scope ID, if present in src, is stripped before
325 * any comparison. We SHOULD enforce scope/zone checks where the source
326 * filter entry has a link scope.
328 * NOTE: This does not check if the entry is in-mode, merely if
329 * it exists, which may not be the desired behaviour.
331 static struct in6_msource *
332 im6o_match_source(const struct ip6_moptions *imo, const size_t gidx,
333 const struct sockaddr *src)
335 struct ip6_msource find;
336 struct in6_mfilter *imf;
337 struct ip6_msource *ims;
338 const sockunion_t *psa;
340 KASSERT(src->sa_family == AF_INET6, ("%s: !AF_INET6", __func__));
341 KASSERT(gidx != -1 && gidx < imo->im6o_num_memberships,
342 ("%s: invalid index %d\n", __func__, (int)gidx));
344 /* The im6o_mfilters array may be lazy allocated. */
345 if (imo->im6o_mfilters == NULL)
347 imf = &imo->im6o_mfilters[gidx];
349 psa = (const sockunion_t *)src;
350 find.im6s_addr = psa->sin6.sin6_addr;
351 in6_clearscope(&find.im6s_addr); /* XXX */
352 ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
354 return ((struct in6_msource *)ims);
358 * Perform filtering for multicast datagrams on a socket by group and source.
360 * Returns 0 if a datagram should be allowed through, or various error codes
361 * if the socket was not a member of the group, or the source was muted, etc.
364 im6o_mc_filter(const struct ip6_moptions *imo, const struct ifnet *ifp,
365 const struct sockaddr *group, const struct sockaddr *src)
368 struct in6_msource *ims;
371 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
373 gidx = im6o_match_group(imo, ifp, group);
375 return (MCAST_NOTGMEMBER);
378 * Check if the source was included in an (S,G) join.
379 * Allow reception on exclusive memberships by default,
380 * reject reception on inclusive memberships by default.
381 * Exclude source only if an in-mode exclude filter exists.
382 * Include source only if an in-mode include filter exists.
383 * NOTE: We are comparing group state here at MLD t1 (now)
384 * with socket-layer t0 (since last downcall).
386 mode = imo->im6o_mfilters[gidx].im6f_st[1];
387 ims = im6o_match_source(imo, gidx, src);
389 if ((ims == NULL && mode == MCAST_INCLUDE) ||
390 (ims != NULL && ims->im6sl_st[0] != mode))
391 return (MCAST_NOTSMEMBER);
397 * Find and return a reference to an in6_multi record for (ifp, group),
398 * and bump its reference count.
399 * If one does not exist, try to allocate it, and update link-layer multicast
400 * filters on ifp to listen for group.
401 * Assumes the IN6_MULTI lock is held across the call.
402 * Return 0 if successful, otherwise return an appropriate error code.
405 in6_getmulti(struct ifnet *ifp, const struct in6_addr *group,
406 struct in6_multi **pinm)
408 struct sockaddr_in6 gsin6;
409 struct ifmultiaddr *ifma;
410 struct in6_multi *inm;
416 * XXX: Accesses to ifma_protospec must be covered by IF_ADDR_LOCK;
417 * if_addmulti() takes this mutex itself, so we must drop and
418 * re-acquire around the call.
420 IN6_MULTI_LOCK_ASSERT();
421 IN6_MULTI_LIST_LOCK();
423 inm = in6m_lookup_locked(ifp, group);
426 * If we already joined this group, just bump the
427 * refcount and return it.
429 KASSERT(inm->in6m_refcount >= 1,
430 ("%s: bad refcount %d", __func__, inm->in6m_refcount));
431 in6m_acquire_locked(inm);
436 memset(&gsin6, 0, sizeof(gsin6));
437 gsin6.sin6_family = AF_INET6;
438 gsin6.sin6_len = sizeof(struct sockaddr_in6);
439 gsin6.sin6_addr = *group;
442 * Check if a link-layer group is already associated
443 * with this network-layer group on the given ifnet.
445 IN6_MULTI_LIST_UNLOCK();
446 IF_ADDR_WUNLOCK(ifp);
447 error = if_addmulti(ifp, (struct sockaddr *)&gsin6, &ifma);
450 IN6_MULTI_LIST_LOCK();
454 * If something other than netinet6 is occupying the link-layer
455 * group, print a meaningful error message and back out of
457 * Otherwise, bump the refcount on the existing network-layer
458 * group association and return it.
460 if (ifma->ifma_protospec != NULL) {
461 inm = (struct in6_multi *)ifma->ifma_protospec;
463 KASSERT(ifma->ifma_addr != NULL, ("%s: no ifma_addr",
465 KASSERT(ifma->ifma_addr->sa_family == AF_INET6,
466 ("%s: ifma not AF_INET6", __func__));
467 KASSERT(inm != NULL, ("%s: no ifma_protospec", __func__));
468 if (inm->in6m_ifma != ifma || inm->in6m_ifp != ifp ||
469 !IN6_ARE_ADDR_EQUAL(&inm->in6m_addr, group))
470 panic("%s: ifma %p is inconsistent with %p (%p)",
471 __func__, ifma, inm, group);
473 in6m_acquire_locked(inm);
478 IF_ADDR_WLOCK_ASSERT(ifp);
481 * A new in6_multi record is needed; allocate and initialize it.
482 * We DO NOT perform an MLD join as the in6_ layer may need to
483 * push an initial source list down to MLD to support SSM.
485 * The initial source filter state is INCLUDE, {} as per the RFC.
486 * Pending state-changes per group are subject to a bounds check.
488 inm = malloc(sizeof(*inm), M_IP6MADDR, M_NOWAIT | M_ZERO);
490 IN6_MULTI_LIST_UNLOCK();
491 IF_ADDR_WUNLOCK(ifp);
492 if_delmulti_ifma(ifma);
495 inm->in6m_addr = *group;
497 inm->in6m_mli = MLD_IFINFO(ifp);
498 inm->in6m_ifma = ifma;
499 inm->in6m_refcount = 1;
500 inm->in6m_state = MLD_NOT_MEMBER;
501 mbufq_init(&inm->in6m_scq, MLD_MAX_STATE_CHANGES);
503 inm->in6m_st[0].iss_fmode = MCAST_UNDEFINED;
504 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
505 RB_INIT(&inm->in6m_srcs);
507 ifma->ifma_protospec = inm;
511 IN6_MULTI_LIST_UNLOCK();
512 IF_ADDR_WUNLOCK(ifp);
517 * Drop a reference to an in6_multi record.
519 * If the refcount drops to 0, free the in6_multi record and
520 * delete the underlying link-layer membership.
523 in6m_release(struct in6_multi *inm)
525 struct ifmultiaddr *ifma;
528 CTR2(KTR_MLD, "%s: refcount is %d", __func__, inm->in6m_refcount);
530 MPASS(inm->in6m_refcount == 0);
531 CTR2(KTR_MLD, "%s: freeing inm %p", __func__, inm);
533 ifma = inm->in6m_ifma;
535 MPASS(ifma->ifma_llifma == NULL);
537 /* XXX this access is not covered by IF_ADDR_LOCK */
538 CTR2(KTR_MLD, "%s: purging ifma %p", __func__, ifma);
539 KASSERT(ifma->ifma_protospec == NULL,
540 ("%s: ifma_protospec != NULL", __func__));
543 CURVNET_SET(ifp->if_vnet);
545 free(inm, M_IP6MADDR);
547 if_delmulti_ifma_flags(ifma, 1);
554 static struct grouptask free_gtask;
555 static struct in6_multi_head in6m_free_list;
556 static void in6m_release_task(void *arg __unused);
557 static void in6m_init(void)
559 SLIST_INIT(&in6m_free_list);
560 taskqgroup_config_gtask_init(NULL, &free_gtask, in6m_release_task, "in6m release task");
563 SYSINIT(in6m_init, SI_SUB_SMP + 1, SI_ORDER_FIRST,
568 in6m_release_list_deferred(struct in6_multi_head *inmh)
570 if (SLIST_EMPTY(inmh))
572 mtx_lock(&in6_multi_free_mtx);
573 SLIST_CONCAT(&in6m_free_list, inmh, in6_multi, in6m_nrele);
574 mtx_unlock(&in6_multi_free_mtx);
575 GROUPTASK_ENQUEUE(&free_gtask);
579 in6m_disconnect(struct in6_multi *inm)
583 struct in6_ifaddr *ifa6;
584 struct in6_multi_mship *imm;
585 struct ifmultiaddr *ifma, *ll_ifma;
588 IF_ADDR_WLOCK_ASSERT(ifp);
589 ifma = inm->in6m_ifma;
592 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
593 MCDPRINTF("removed ifma: %p from %s\n", ifma, ifp->if_xname);
594 if ((ll_ifma = ifma->ifma_llifma) != NULL) {
595 MPASS(ifma != ll_ifma);
596 ifma->ifma_llifma = NULL;
597 MPASS(ll_ifma->ifma_llifma == NULL);
598 MPASS(ll_ifma->ifma_ifp == ifp);
599 if (--ll_ifma->ifma_refcount == 0) {
600 ifma6_restart = true;
601 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifma_link);
602 MCDPRINTF("removed ll_ifma: %p from %s\n", ll_ifma, ifp->if_xname);
603 if_freemulti(ll_ifma);
606 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
607 if (ifa->ifa_addr->sa_family != AF_INET6)
610 LIST_FOREACH(imm, &ifa6->ia6_memberships, i6mm_chain) {
611 if (inm == imm->i6mm_maddr) {
612 LIST_REMOVE(imm, i6mm_chain);
613 free(imm, M_IP6MADDR);
620 in6m_release_deferred(struct in6_multi *inm)
622 struct in6_multi_head tmp;
624 IN6_MULTI_LIST_LOCK_ASSERT();
625 KASSERT(inm->in6m_refcount > 0, ("refcount == %d inm: %p", inm->in6m_refcount, inm));
626 if (--inm->in6m_refcount == 0) {
627 in6m_disconnect(inm);
629 inm->in6m_ifma->ifma_protospec = NULL;
630 MPASS(inm->in6m_ifma->ifma_llifma == NULL);
631 SLIST_INSERT_HEAD(&tmp, inm, in6m_nrele);
632 in6m_release_list_deferred(&tmp);
637 in6m_release_task(void *arg __unused)
639 struct in6_multi_head in6m_free_tmp;
640 struct in6_multi *inm, *tinm;
642 SLIST_INIT(&in6m_free_tmp);
643 mtx_lock(&in6_multi_free_mtx);
644 SLIST_CONCAT(&in6m_free_tmp, &in6m_free_list, in6_multi, in6m_nrele);
645 mtx_unlock(&in6_multi_free_mtx);
647 SLIST_FOREACH_SAFE(inm, &in6m_free_tmp, in6m_nrele, tinm) {
648 SLIST_REMOVE_HEAD(&in6m_free_tmp, in6m_nrele);
655 * Clear recorded source entries for a group.
656 * Used by the MLD code. Caller must hold the IN6_MULTI lock.
657 * FIXME: Should reap.
660 in6m_clear_recorded(struct in6_multi *inm)
662 struct ip6_msource *ims;
664 IN6_MULTI_LIST_LOCK_ASSERT();
666 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
669 --inm->in6m_st[1].iss_rec;
672 KASSERT(inm->in6m_st[1].iss_rec == 0,
673 ("%s: iss_rec %d not 0", __func__, inm->in6m_st[1].iss_rec));
677 * Record a source as pending for a Source-Group MLDv2 query.
678 * This lives here as it modifies the shared tree.
680 * inm is the group descriptor.
681 * naddr is the address of the source to record in network-byte order.
683 * If the net.inet6.mld.sgalloc sysctl is non-zero, we will
684 * lazy-allocate a source node in response to an SG query.
685 * Otherwise, no allocation is performed. This saves some memory
686 * with the trade-off that the source will not be reported to the
687 * router if joined in the window between the query response and
688 * the group actually being joined on the local host.
690 * VIMAGE: XXX: Currently the mld_sgalloc feature has been removed.
691 * This turns off the allocation of a recorded source entry if
692 * the group has not been joined.
694 * Return 0 if the source didn't exist or was already marked as recorded.
695 * Return 1 if the source was marked as recorded by this function.
696 * Return <0 if any error occurred (negated errno code).
699 in6m_record_source(struct in6_multi *inm, const struct in6_addr *addr)
701 struct ip6_msource find;
702 struct ip6_msource *ims, *nims;
704 IN6_MULTI_LIST_LOCK_ASSERT();
706 find.im6s_addr = *addr;
707 ims = RB_FIND(ip6_msource_tree, &inm->in6m_srcs, &find);
708 if (ims && ims->im6s_stp)
711 if (inm->in6m_nsrc == in6_mcast_maxgrpsrc)
713 nims = malloc(sizeof(struct ip6_msource), M_IP6MSOURCE,
717 nims->im6s_addr = find.im6s_addr;
718 RB_INSERT(ip6_msource_tree, &inm->in6m_srcs, nims);
724 * Mark the source as recorded and update the recorded
728 ++inm->in6m_st[1].iss_rec;
734 * Return a pointer to an in6_msource owned by an in6_mfilter,
735 * given its source address.
736 * Lazy-allocate if needed. If this is a new entry its filter state is
739 * imf is the filter set being modified.
740 * addr is the source address.
742 * SMPng: May be called with locks held; malloc must not block.
745 im6f_get_source(struct in6_mfilter *imf, const struct sockaddr_in6 *psin,
746 struct in6_msource **plims)
748 struct ip6_msource find;
749 struct ip6_msource *ims, *nims;
750 struct in6_msource *lims;
757 find.im6s_addr = psin->sin6_addr;
758 ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
759 lims = (struct in6_msource *)ims;
761 if (imf->im6f_nsrc == in6_mcast_maxsocksrc)
763 nims = malloc(sizeof(struct in6_msource), M_IN6MFILTER,
767 lims = (struct in6_msource *)nims;
768 lims->im6s_addr = find.im6s_addr;
769 lims->im6sl_st[0] = MCAST_UNDEFINED;
770 RB_INSERT(ip6_msource_tree, &imf->im6f_sources, nims);
780 * Graft a source entry into an existing socket-layer filter set,
781 * maintaining any required invariants and checking allocations.
783 * The source is marked as being in the new filter mode at t1.
785 * Return the pointer to the new node, otherwise return NULL.
787 static struct in6_msource *
788 im6f_graft(struct in6_mfilter *imf, const uint8_t st1,
789 const struct sockaddr_in6 *psin)
791 struct ip6_msource *nims;
792 struct in6_msource *lims;
794 nims = malloc(sizeof(struct in6_msource), M_IN6MFILTER,
798 lims = (struct in6_msource *)nims;
799 lims->im6s_addr = psin->sin6_addr;
800 lims->im6sl_st[0] = MCAST_UNDEFINED;
801 lims->im6sl_st[1] = st1;
802 RB_INSERT(ip6_msource_tree, &imf->im6f_sources, nims);
809 * Prune a source entry from an existing socket-layer filter set,
810 * maintaining any required invariants and checking allocations.
812 * The source is marked as being left at t1, it is not freed.
814 * Return 0 if no error occurred, otherwise return an errno value.
817 im6f_prune(struct in6_mfilter *imf, const struct sockaddr_in6 *psin)
819 struct ip6_msource find;
820 struct ip6_msource *ims;
821 struct in6_msource *lims;
823 find.im6s_addr = psin->sin6_addr;
824 ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
827 lims = (struct in6_msource *)ims;
828 lims->im6sl_st[1] = MCAST_UNDEFINED;
833 * Revert socket-layer filter set deltas at t1 to t0 state.
836 im6f_rollback(struct in6_mfilter *imf)
838 struct ip6_msource *ims, *tims;
839 struct in6_msource *lims;
841 RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
842 lims = (struct in6_msource *)ims;
843 if (lims->im6sl_st[0] == lims->im6sl_st[1]) {
844 /* no change at t1 */
846 } else if (lims->im6sl_st[0] != MCAST_UNDEFINED) {
847 /* revert change to existing source at t1 */
848 lims->im6sl_st[1] = lims->im6sl_st[0];
850 /* revert source added t1 */
851 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
852 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
853 free(ims, M_IN6MFILTER);
857 imf->im6f_st[1] = imf->im6f_st[0];
861 * Mark socket-layer filter set as INCLUDE {} at t1.
864 im6f_leave(struct in6_mfilter *imf)
866 struct ip6_msource *ims;
867 struct in6_msource *lims;
869 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
870 lims = (struct in6_msource *)ims;
871 lims->im6sl_st[1] = MCAST_UNDEFINED;
873 imf->im6f_st[1] = MCAST_INCLUDE;
877 * Mark socket-layer filter set deltas as committed.
880 im6f_commit(struct in6_mfilter *imf)
882 struct ip6_msource *ims;
883 struct in6_msource *lims;
885 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
886 lims = (struct in6_msource *)ims;
887 lims->im6sl_st[0] = lims->im6sl_st[1];
889 imf->im6f_st[0] = imf->im6f_st[1];
893 * Reap unreferenced sources from socket-layer filter set.
896 im6f_reap(struct in6_mfilter *imf)
898 struct ip6_msource *ims, *tims;
899 struct in6_msource *lims;
901 RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
902 lims = (struct in6_msource *)ims;
903 if ((lims->im6sl_st[0] == MCAST_UNDEFINED) &&
904 (lims->im6sl_st[1] == MCAST_UNDEFINED)) {
905 CTR2(KTR_MLD, "%s: free lims %p", __func__, ims);
906 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
907 free(ims, M_IN6MFILTER);
914 * Purge socket-layer filter set.
917 im6f_purge(struct in6_mfilter *imf)
919 struct ip6_msource *ims, *tims;
921 RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
922 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
923 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
924 free(ims, M_IN6MFILTER);
927 imf->im6f_st[0] = imf->im6f_st[1] = MCAST_UNDEFINED;
928 KASSERT(RB_EMPTY(&imf->im6f_sources),
929 ("%s: im6f_sources not empty", __func__));
933 * Look up a source filter entry for a multicast group.
935 * inm is the group descriptor to work with.
936 * addr is the IPv6 address to look up.
937 * noalloc may be non-zero to suppress allocation of sources.
938 * *pims will be set to the address of the retrieved or allocated source.
940 * SMPng: NOTE: may be called with locks held.
941 * Return 0 if successful, otherwise return a non-zero error code.
944 in6m_get_source(struct in6_multi *inm, const struct in6_addr *addr,
945 const int noalloc, struct ip6_msource **pims)
947 struct ip6_msource find;
948 struct ip6_msource *ims, *nims;
950 char ip6tbuf[INET6_ADDRSTRLEN];
953 find.im6s_addr = *addr;
954 ims = RB_FIND(ip6_msource_tree, &inm->in6m_srcs, &find);
955 if (ims == NULL && !noalloc) {
956 if (inm->in6m_nsrc == in6_mcast_maxgrpsrc)
958 nims = malloc(sizeof(struct ip6_msource), M_IP6MSOURCE,
962 nims->im6s_addr = *addr;
963 RB_INSERT(ip6_msource_tree, &inm->in6m_srcs, nims);
966 CTR3(KTR_MLD, "%s: allocated %s as %p", __func__,
967 ip6_sprintf(ip6tbuf, addr), ims);
975 * Merge socket-layer source into MLD-layer source.
976 * If rollback is non-zero, perform the inverse of the merge.
979 im6s_merge(struct ip6_msource *ims, const struct in6_msource *lims,
982 int n = rollback ? -1 : 1;
984 char ip6tbuf[INET6_ADDRSTRLEN];
986 ip6_sprintf(ip6tbuf, &lims->im6s_addr);
989 if (lims->im6sl_st[0] == MCAST_EXCLUDE) {
990 CTR3(KTR_MLD, "%s: t1 ex -= %d on %s", __func__, n, ip6tbuf);
991 ims->im6s_st[1].ex -= n;
992 } else if (lims->im6sl_st[0] == MCAST_INCLUDE) {
993 CTR3(KTR_MLD, "%s: t1 in -= %d on %s", __func__, n, ip6tbuf);
994 ims->im6s_st[1].in -= n;
997 if (lims->im6sl_st[1] == MCAST_EXCLUDE) {
998 CTR3(KTR_MLD, "%s: t1 ex += %d on %s", __func__, n, ip6tbuf);
999 ims->im6s_st[1].ex += n;
1000 } else if (lims->im6sl_st[1] == MCAST_INCLUDE) {
1001 CTR3(KTR_MLD, "%s: t1 in += %d on %s", __func__, n, ip6tbuf);
1002 ims->im6s_st[1].in += n;
1007 * Atomically update the global in6_multi state, when a membership's
1008 * filter list is being updated in any way.
1010 * imf is the per-inpcb-membership group filter pointer.
1011 * A fake imf may be passed for in-kernel consumers.
1013 * XXX This is a candidate for a set-symmetric-difference style loop
1014 * which would eliminate the repeated lookup from root of ims nodes,
1015 * as they share the same key space.
1017 * If any error occurred this function will back out of refcounts
1018 * and return a non-zero value.
1021 in6m_merge(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
1023 struct ip6_msource *ims, *nims;
1024 struct in6_msource *lims;
1025 int schanged, error;
1031 IN6_MULTI_LIST_LOCK_ASSERT();
1034 * Update the source filters first, as this may fail.
1035 * Maintain count of in-mode filters at t0, t1. These are
1036 * used to work out if we transition into ASM mode or not.
1037 * Maintain a count of source filters whose state was
1038 * actually modified by this operation.
1040 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
1041 lims = (struct in6_msource *)ims;
1042 if (lims->im6sl_st[0] == imf->im6f_st[0]) nsrc0++;
1043 if (lims->im6sl_st[1] == imf->im6f_st[1]) nsrc1++;
1044 if (lims->im6sl_st[0] == lims->im6sl_st[1]) continue;
1045 error = in6m_get_source(inm, &lims->im6s_addr, 0, &nims);
1049 im6s_merge(nims, lims, 0);
1052 struct ip6_msource *bims;
1054 RB_FOREACH_REVERSE_FROM(ims, ip6_msource_tree, nims) {
1055 lims = (struct in6_msource *)ims;
1056 if (lims->im6sl_st[0] == lims->im6sl_st[1])
1058 (void)in6m_get_source(inm, &lims->im6s_addr, 1, &bims);
1061 im6s_merge(bims, lims, 1);
1066 CTR3(KTR_MLD, "%s: imf filters in-mode: %d at t0, %d at t1",
1067 __func__, nsrc0, nsrc1);
1069 /* Handle transition between INCLUDE {n} and INCLUDE {} on socket. */
1070 if (imf->im6f_st[0] == imf->im6f_st[1] &&
1071 imf->im6f_st[1] == MCAST_INCLUDE) {
1073 CTR1(KTR_MLD, "%s: --in on inm at t1", __func__);
1074 --inm->in6m_st[1].iss_in;
1078 /* Handle filter mode transition on socket. */
1079 if (imf->im6f_st[0] != imf->im6f_st[1]) {
1080 CTR3(KTR_MLD, "%s: imf transition %d to %d",
1081 __func__, imf->im6f_st[0], imf->im6f_st[1]);
1083 if (imf->im6f_st[0] == MCAST_EXCLUDE) {
1084 CTR1(KTR_MLD, "%s: --ex on inm at t1", __func__);
1085 --inm->in6m_st[1].iss_ex;
1086 } else if (imf->im6f_st[0] == MCAST_INCLUDE) {
1087 CTR1(KTR_MLD, "%s: --in on inm at t1", __func__);
1088 --inm->in6m_st[1].iss_in;
1091 if (imf->im6f_st[1] == MCAST_EXCLUDE) {
1092 CTR1(KTR_MLD, "%s: ex++ on inm at t1", __func__);
1093 inm->in6m_st[1].iss_ex++;
1094 } else if (imf->im6f_st[1] == MCAST_INCLUDE && nsrc1 > 0) {
1095 CTR1(KTR_MLD, "%s: in++ on inm at t1", __func__);
1096 inm->in6m_st[1].iss_in++;
1101 * Track inm filter state in terms of listener counts.
1102 * If there are any exclusive listeners, stack-wide
1103 * membership is exclusive.
1104 * Otherwise, if only inclusive listeners, stack-wide is inclusive.
1105 * If no listeners remain, state is undefined at t1,
1106 * and the MLD lifecycle for this group should finish.
1108 if (inm->in6m_st[1].iss_ex > 0) {
1109 CTR1(KTR_MLD, "%s: transition to EX", __func__);
1110 inm->in6m_st[1].iss_fmode = MCAST_EXCLUDE;
1111 } else if (inm->in6m_st[1].iss_in > 0) {
1112 CTR1(KTR_MLD, "%s: transition to IN", __func__);
1113 inm->in6m_st[1].iss_fmode = MCAST_INCLUDE;
1115 CTR1(KTR_MLD, "%s: transition to UNDEF", __func__);
1116 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
1119 /* Decrement ASM listener count on transition out of ASM mode. */
1120 if (imf->im6f_st[0] == MCAST_EXCLUDE && nsrc0 == 0) {
1121 if ((imf->im6f_st[1] != MCAST_EXCLUDE) ||
1122 (imf->im6f_st[1] == MCAST_EXCLUDE && nsrc1 > 0)) {
1123 CTR1(KTR_MLD, "%s: --asm on inm at t1", __func__);
1124 --inm->in6m_st[1].iss_asm;
1128 /* Increment ASM listener count on transition to ASM mode. */
1129 if (imf->im6f_st[1] == MCAST_EXCLUDE && nsrc1 == 0) {
1130 CTR1(KTR_MLD, "%s: asm++ on inm at t1", __func__);
1131 inm->in6m_st[1].iss_asm++;
1134 CTR3(KTR_MLD, "%s: merged imf %p to inm %p", __func__, imf, inm);
1139 CTR1(KTR_MLD, "%s: sources changed; reaping", __func__);
1146 * Mark an in6_multi's filter set deltas as committed.
1147 * Called by MLD after a state change has been enqueued.
1150 in6m_commit(struct in6_multi *inm)
1152 struct ip6_msource *ims;
1154 CTR2(KTR_MLD, "%s: commit inm %p", __func__, inm);
1155 CTR1(KTR_MLD, "%s: pre commit:", __func__);
1158 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
1159 ims->im6s_st[0] = ims->im6s_st[1];
1161 inm->in6m_st[0] = inm->in6m_st[1];
1165 * Reap unreferenced nodes from an in6_multi's filter set.
1168 in6m_reap(struct in6_multi *inm)
1170 struct ip6_msource *ims, *tims;
1172 RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs, tims) {
1173 if (ims->im6s_st[0].ex > 0 || ims->im6s_st[0].in > 0 ||
1174 ims->im6s_st[1].ex > 0 || ims->im6s_st[1].in > 0 ||
1177 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
1178 RB_REMOVE(ip6_msource_tree, &inm->in6m_srcs, ims);
1179 free(ims, M_IP6MSOURCE);
1185 * Purge all source nodes from an in6_multi's filter set.
1188 in6m_purge(struct in6_multi *inm)
1190 struct ip6_msource *ims, *tims;
1192 RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs, tims) {
1193 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
1194 RB_REMOVE(ip6_msource_tree, &inm->in6m_srcs, ims);
1195 free(ims, M_IP6MSOURCE);
1198 /* Free state-change requests that might be queued. */
1199 mbufq_drain(&inm->in6m_scq);
1203 * Join a multicast address w/o sources.
1204 * KAME compatibility entry point.
1206 * SMPng: Assume no mc locks held by caller.
1209 in6_joingroup(struct ifnet *ifp, const struct in6_addr *mcaddr,
1210 /*const*/ struct in6_mfilter *imf, struct in6_multi **pinm,
1216 error = in6_joingroup_locked(ifp, mcaddr, NULL, pinm, delay);
1222 * Join a multicast group; real entry point.
1224 * Only preserves atomicity at inm level.
1225 * NOTE: imf argument cannot be const due to sys/tree.h limitations.
1227 * If the MLD downcall fails, the group is not joined, and an error
1231 in6_joingroup_locked(struct ifnet *ifp, const struct in6_addr *mcaddr,
1232 /*const*/ struct in6_mfilter *imf, struct in6_multi **pinm,
1235 struct in6_mfilter timf;
1236 struct in6_multi *inm;
1237 struct ifmultiaddr *ifma;
1240 char ip6tbuf[INET6_ADDRSTRLEN];
1245 * Sanity: Check scope zone ID was set for ifp, if and
1246 * only if group is scoped to an interface.
1248 KASSERT(IN6_IS_ADDR_MULTICAST(mcaddr),
1249 ("%s: not a multicast address", __func__));
1250 if (IN6_IS_ADDR_MC_LINKLOCAL(mcaddr) ||
1251 IN6_IS_ADDR_MC_INTFACELOCAL(mcaddr)) {
1252 KASSERT(mcaddr->s6_addr16[1] != 0,
1253 ("%s: scope zone ID not set", __func__));
1257 IN6_MULTI_LOCK_ASSERT();
1258 IN6_MULTI_LIST_UNLOCK_ASSERT();
1260 CTR4(KTR_MLD, "%s: join %s on %p(%s))", __func__,
1261 ip6_sprintf(ip6tbuf, mcaddr), ifp, if_name(ifp));
1267 * If no imf was specified (i.e. kernel consumer),
1268 * fake one up and assume it is an ASM join.
1271 im6f_init(&timf, MCAST_UNDEFINED, MCAST_EXCLUDE);
1274 error = in6_getmulti(ifp, mcaddr, &inm);
1276 CTR1(KTR_MLD, "%s: in6_getmulti() failure", __func__);
1280 IN6_MULTI_LIST_LOCK();
1281 CTR1(KTR_MLD, "%s: merge inm state", __func__);
1282 error = in6m_merge(inm, imf);
1284 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
1285 goto out_in6m_release;
1288 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
1289 error = mld_change_state(inm, delay);
1291 CTR1(KTR_MLD, "%s: failed to update source", __func__);
1292 goto out_in6m_release;
1297 CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
1299 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1300 if (ifma->ifma_protospec == inm) {
1301 ifma->ifma_protospec = NULL;
1305 in6m_release_deferred(inm);
1306 IF_ADDR_RUNLOCK(ifp);
1310 IN6_MULTI_LIST_UNLOCK();
1315 * Leave a multicast group; unlocked entry point.
1318 in6_leavegroup(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
1323 error = in6_leavegroup_locked(inm, imf);
1329 * Leave a multicast group; real entry point.
1330 * All source filters will be expunged.
1332 * Only preserves atomicity at inm level.
1334 * Holding the write lock for the INP which contains imf
1335 * is highly advisable. We can't assert for it as imf does not
1336 * contain a back-pointer to the owning inp.
1338 * Note: This is not the same as in6m_release(*) as this function also
1339 * makes a state change downcall into MLD.
1342 in6_leavegroup_locked(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
1344 struct in6_mfilter timf;
1348 char ip6tbuf[INET6_ADDRSTRLEN];
1353 IN6_MULTI_LOCK_ASSERT();
1355 CTR5(KTR_MLD, "%s: leave inm %p, %s/%s, imf %p", __func__,
1356 inm, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
1357 (in6m_is_ifp_detached(inm) ? "null" : if_name(inm->in6m_ifp)),
1361 * If no imf was specified (i.e. kernel consumer),
1362 * fake one up and assume it is an ASM join.
1365 im6f_init(&timf, MCAST_EXCLUDE, MCAST_UNDEFINED);
1370 * Begin state merge transaction at MLD layer.
1372 * As this particular invocation should not cause any memory
1373 * to be allocated, and there is no opportunity to roll back
1374 * the transaction, it MUST NOT fail.
1377 ifp = inm->in6m_ifp;
1378 IN6_MULTI_LIST_LOCK();
1379 CTR1(KTR_MLD, "%s: merge inm state", __func__);
1380 error = in6m_merge(inm, imf);
1381 KASSERT(error == 0, ("%s: failed to merge inm state", __func__));
1383 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
1384 error = mld_change_state(inm, 0);
1386 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
1388 CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
1391 in6m_release_deferred(inm);
1393 IF_ADDR_WUNLOCK(ifp);
1394 IN6_MULTI_LIST_UNLOCK();
1401 * Block or unblock an ASM multicast source on an inpcb.
1402 * This implements the delta-based API described in RFC 3678.
1404 * The delta-based API applies only to exclusive-mode memberships.
1405 * An MLD downcall will be performed.
1407 * SMPng: NOTE: Must take Giant as a join may create a new ifma.
1409 * Return 0 if successful, otherwise return an appropriate error code.
1412 in6p_block_unblock_source(struct inpcb *inp, struct sockopt *sopt)
1414 struct group_source_req gsr;
1415 sockunion_t *gsa, *ssa;
1417 struct in6_mfilter *imf;
1418 struct ip6_moptions *imo;
1419 struct in6_msource *ims;
1420 struct in6_multi *inm;
1425 char ip6tbuf[INET6_ADDRSTRLEN];
1432 memset(&gsr, 0, sizeof(struct group_source_req));
1433 gsa = (sockunion_t *)&gsr.gsr_group;
1434 ssa = (sockunion_t *)&gsr.gsr_source;
1436 switch (sopt->sopt_name) {
1437 case MCAST_BLOCK_SOURCE:
1438 case MCAST_UNBLOCK_SOURCE:
1439 error = sooptcopyin(sopt, &gsr,
1440 sizeof(struct group_source_req),
1441 sizeof(struct group_source_req));
1445 if (gsa->sin6.sin6_family != AF_INET6 ||
1446 gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1449 if (ssa->sin6.sin6_family != AF_INET6 ||
1450 ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1453 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1454 return (EADDRNOTAVAIL);
1456 ifp = ifnet_byindex(gsr.gsr_interface);
1458 if (sopt->sopt_name == MCAST_BLOCK_SOURCE)
1463 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
1464 __func__, sopt->sopt_name);
1465 return (EOPNOTSUPP);
1469 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
1472 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
1475 * Check if we are actually a member of this group.
1477 imo = in6p_findmoptions(inp);
1478 idx = im6o_match_group(imo, ifp, &gsa->sa);
1479 if (idx == -1 || imo->im6o_mfilters == NULL) {
1480 error = EADDRNOTAVAIL;
1481 goto out_in6p_locked;
1484 KASSERT(imo->im6o_mfilters != NULL,
1485 ("%s: im6o_mfilters not allocated", __func__));
1486 imf = &imo->im6o_mfilters[idx];
1487 inm = imo->im6o_membership[idx];
1490 * Attempting to use the delta-based API on an
1491 * non exclusive-mode membership is an error.
1493 fmode = imf->im6f_st[0];
1494 if (fmode != MCAST_EXCLUDE) {
1496 goto out_in6p_locked;
1500 * Deal with error cases up-front:
1501 * Asked to block, but already blocked; or
1502 * Asked to unblock, but nothing to unblock.
1503 * If adding a new block entry, allocate it.
1505 ims = im6o_match_source(imo, idx, &ssa->sa);
1506 if ((ims != NULL && doblock) || (ims == NULL && !doblock)) {
1507 CTR3(KTR_MLD, "%s: source %s %spresent", __func__,
1508 ip6_sprintf(ip6tbuf, &ssa->sin6.sin6_addr),
1509 doblock ? "" : "not ");
1510 error = EADDRNOTAVAIL;
1511 goto out_in6p_locked;
1514 INP_WLOCK_ASSERT(inp);
1517 * Begin state merge transaction at socket layer.
1520 CTR2(KTR_MLD, "%s: %s source", __func__, "block");
1521 ims = im6f_graft(imf, fmode, &ssa->sin6);
1525 CTR2(KTR_MLD, "%s: %s source", __func__, "allow");
1526 error = im6f_prune(imf, &ssa->sin6);
1530 CTR1(KTR_MLD, "%s: merge imf state failed", __func__);
1531 goto out_im6f_rollback;
1535 * Begin state merge transaction at MLD layer.
1537 IN6_MULTI_LIST_LOCK();
1538 CTR1(KTR_MLD, "%s: merge inm state", __func__);
1539 error = in6m_merge(inm, imf);
1541 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
1543 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
1544 error = mld_change_state(inm, 0);
1546 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
1549 IN6_MULTI_LIST_UNLOCK();
1565 * Given an inpcb, return its multicast options structure pointer. Accepts
1566 * an unlocked inpcb pointer, but will return it locked. May sleep.
1568 * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
1569 * SMPng: NOTE: Returns with the INP write lock held.
1571 static struct ip6_moptions *
1572 in6p_findmoptions(struct inpcb *inp)
1574 struct ip6_moptions *imo;
1575 struct in6_multi **immp;
1576 struct in6_mfilter *imfp;
1580 if (inp->in6p_moptions != NULL)
1581 return (inp->in6p_moptions);
1585 imo = malloc(sizeof(*imo), M_IP6MOPTS, M_WAITOK);
1586 immp = malloc(sizeof(*immp) * IPV6_MIN_MEMBERSHIPS, M_IP6MOPTS,
1588 imfp = malloc(sizeof(struct in6_mfilter) * IPV6_MIN_MEMBERSHIPS,
1589 M_IN6MFILTER, M_WAITOK);
1591 imo->im6o_multicast_ifp = NULL;
1592 imo->im6o_multicast_hlim = V_ip6_defmcasthlim;
1593 imo->im6o_multicast_loop = in6_mcast_loop;
1594 imo->im6o_num_memberships = 0;
1595 imo->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS;
1596 imo->im6o_membership = immp;
1598 /* Initialize per-group source filters. */
1599 for (idx = 0; idx < IPV6_MIN_MEMBERSHIPS; idx++)
1600 im6f_init(&imfp[idx], MCAST_UNDEFINED, MCAST_EXCLUDE);
1601 imo->im6o_mfilters = imfp;
1604 if (inp->in6p_moptions != NULL) {
1605 free(imfp, M_IN6MFILTER);
1606 free(immp, M_IP6MOPTS);
1607 free(imo, M_IP6MOPTS);
1608 return (inp->in6p_moptions);
1610 inp->in6p_moptions = imo;
1615 * Discard the IPv6 multicast options (and source filters).
1617 * SMPng: NOTE: assumes INP write lock is held.
1620 ip6_freemoptions(struct ip6_moptions *imo, struct inpcbinfo *pcbinfo)
1622 struct in6_mfilter *imf;
1623 size_t idx, nmships;
1628 INP_INFO_LOCK_ASSERT(pcbinfo);
1629 wlock = INP_INFO_WLOCKED(pcbinfo);
1631 INP_INFO_WUNLOCK(pcbinfo);
1633 INP_INFO_RUNLOCK(pcbinfo);
1635 nmships = imo->im6o_num_memberships;
1636 for (idx = 0; idx < nmships; ++idx) {
1637 imf = imo->im6o_mfilters ? &imo->im6o_mfilters[idx] : NULL;
1640 /* XXX this will thrash the lock(s) */
1641 (void)in6_leavegroup(imo->im6o_membership[idx], imf);
1646 if (imo->im6o_mfilters)
1647 free(imo->im6o_mfilters, M_IN6MFILTER);
1648 free(imo->im6o_membership, M_IP6MOPTS);
1649 free(imo, M_IP6MOPTS);
1651 INP_INFO_WLOCK(pcbinfo);
1653 INP_INFO_RLOCK(pcbinfo);
1657 * Atomically get source filters on a socket for an IPv6 multicast group.
1658 * Called with INP lock held; returns with lock released.
1661 in6p_get_source_filters(struct inpcb *inp, struct sockopt *sopt)
1663 struct __msfilterreq msfr;
1666 struct ip6_moptions *imo;
1667 struct in6_mfilter *imf;
1668 struct ip6_msource *ims;
1669 struct in6_msource *lims;
1670 struct sockaddr_in6 *psin;
1671 struct sockaddr_storage *ptss;
1672 struct sockaddr_storage *tss;
1674 size_t idx, nsrcs, ncsrcs;
1676 INP_WLOCK_ASSERT(inp);
1678 imo = inp->in6p_moptions;
1679 KASSERT(imo != NULL, ("%s: null ip6_moptions", __func__));
1683 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
1684 sizeof(struct __msfilterreq));
1688 if (msfr.msfr_group.ss_family != AF_INET6 ||
1689 msfr.msfr_group.ss_len != sizeof(struct sockaddr_in6))
1692 gsa = (sockunion_t *)&msfr.msfr_group;
1693 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
1696 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
1697 return (EADDRNOTAVAIL);
1698 ifp = ifnet_byindex(msfr.msfr_ifindex);
1700 return (EADDRNOTAVAIL);
1701 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
1706 * Lookup group on the socket.
1708 idx = im6o_match_group(imo, ifp, &gsa->sa);
1709 if (idx == -1 || imo->im6o_mfilters == NULL) {
1711 return (EADDRNOTAVAIL);
1713 imf = &imo->im6o_mfilters[idx];
1716 * Ignore memberships which are in limbo.
1718 if (imf->im6f_st[1] == MCAST_UNDEFINED) {
1722 msfr.msfr_fmode = imf->im6f_st[1];
1725 * If the user specified a buffer, copy out the source filter
1726 * entries to userland gracefully.
1727 * We only copy out the number of entries which userland
1728 * has asked for, but we always tell userland how big the
1729 * buffer really needs to be.
1731 if (msfr.msfr_nsrcs > in6_mcast_maxsocksrc)
1732 msfr.msfr_nsrcs = in6_mcast_maxsocksrc;
1734 if (msfr.msfr_srcs != NULL && msfr.msfr_nsrcs > 0) {
1735 tss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
1736 M_TEMP, M_NOWAIT | M_ZERO);
1744 * Count number of sources in-mode at t0.
1745 * If buffer space exists and remains, copy out source entries.
1747 nsrcs = msfr.msfr_nsrcs;
1750 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
1751 lims = (struct in6_msource *)ims;
1752 if (lims->im6sl_st[0] == MCAST_UNDEFINED ||
1753 lims->im6sl_st[0] != imf->im6f_st[0])
1756 if (tss != NULL && nsrcs > 0) {
1757 psin = (struct sockaddr_in6 *)ptss;
1758 psin->sin6_family = AF_INET6;
1759 psin->sin6_len = sizeof(struct sockaddr_in6);
1760 psin->sin6_addr = lims->im6s_addr;
1761 psin->sin6_port = 0;
1770 error = copyout(tss, msfr.msfr_srcs,
1771 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
1777 msfr.msfr_nsrcs = ncsrcs;
1778 error = sooptcopyout(sopt, &msfr, sizeof(struct __msfilterreq));
1784 * Return the IP multicast options in response to user getsockopt().
1787 ip6_getmoptions(struct inpcb *inp, struct sockopt *sopt)
1789 struct ip6_moptions *im6o;
1794 im6o = inp->in6p_moptions;
1796 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
1797 * or is a divert socket, reject it.
1799 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
1800 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
1801 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM)) {
1803 return (EOPNOTSUPP);
1807 switch (sopt->sopt_name) {
1808 case IPV6_MULTICAST_IF:
1809 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) {
1812 optval = im6o->im6o_multicast_ifp->if_index;
1815 error = sooptcopyout(sopt, &optval, sizeof(u_int));
1818 case IPV6_MULTICAST_HOPS:
1820 optval = V_ip6_defmcasthlim;
1822 optval = im6o->im6o_multicast_hlim;
1824 error = sooptcopyout(sopt, &optval, sizeof(u_int));
1827 case IPV6_MULTICAST_LOOP:
1829 optval = in6_mcast_loop; /* XXX VIMAGE */
1831 optval = im6o->im6o_multicast_loop;
1833 error = sooptcopyout(sopt, &optval, sizeof(u_int));
1838 error = EADDRNOTAVAIL;
1841 error = in6p_get_source_filters(inp, sopt);
1847 error = ENOPROTOOPT;
1851 INP_UNLOCK_ASSERT(inp);
1857 * Look up the ifnet to use for a multicast group membership,
1858 * given the address of an IPv6 group.
1860 * This routine exists to support legacy IPv6 multicast applications.
1862 * If inp is non-NULL, use this socket's current FIB number for any
1863 * required FIB lookup. Look up the group address in the unicast FIB,
1864 * and use its ifp; usually, this points to the default next-hop.
1865 * If the FIB lookup fails, return NULL.
1867 * FUTURE: Support multiple forwarding tables for IPv6.
1869 * Returns NULL if no ifp could be found.
1871 static struct ifnet *
1872 in6p_lookup_mcast_ifp(const struct inpcb *in6p,
1873 const struct sockaddr_in6 *gsin6)
1875 struct nhop6_basic nh6;
1876 struct in6_addr dst;
1880 KASSERT(in6p->inp_vflag & INP_IPV6,
1881 ("%s: not INP_IPV6 inpcb", __func__));
1882 KASSERT(gsin6->sin6_family == AF_INET6,
1883 ("%s: not AF_INET6 group", __func__));
1885 in6_splitscope(&gsin6->sin6_addr, &dst, &scopeid);
1886 fibnum = in6p ? in6p->inp_inc.inc_fibnum : RT_DEFAULT_FIB;
1887 if (fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6) != 0)
1890 return (nh6.nh_ifp);
1894 * Join an IPv6 multicast group, possibly with a source.
1896 * FIXME: The KAME use of the unspecified address (::)
1897 * to join *all* multicast groups is currently unsupported.
1900 in6p_join_group(struct inpcb *inp, struct sockopt *sopt)
1902 struct group_source_req gsr;
1903 sockunion_t *gsa, *ssa;
1905 struct in6_mfilter *imf;
1906 struct ip6_moptions *imo;
1907 struct in6_multi *inm;
1908 struct in6_msource *lims;
1918 memset(&gsr, 0, sizeof(struct group_source_req));
1919 gsa = (sockunion_t *)&gsr.gsr_group;
1920 gsa->ss.ss_family = AF_UNSPEC;
1921 ssa = (sockunion_t *)&gsr.gsr_source;
1922 ssa->ss.ss_family = AF_UNSPEC;
1925 * Chew everything into struct group_source_req.
1926 * Overwrite the port field if present, as the sockaddr
1927 * being copied in may be matched with a binary comparison.
1928 * Ignore passed-in scope ID.
1930 switch (sopt->sopt_name) {
1931 case IPV6_JOIN_GROUP: {
1932 struct ipv6_mreq mreq;
1934 error = sooptcopyin(sopt, &mreq, sizeof(struct ipv6_mreq),
1935 sizeof(struct ipv6_mreq));
1939 gsa->sin6.sin6_family = AF_INET6;
1940 gsa->sin6.sin6_len = sizeof(struct sockaddr_in6);
1941 gsa->sin6.sin6_addr = mreq.ipv6mr_multiaddr;
1943 if (mreq.ipv6mr_interface == 0) {
1944 ifp = in6p_lookup_mcast_ifp(inp, &gsa->sin6);
1946 if (V_if_index < mreq.ipv6mr_interface)
1947 return (EADDRNOTAVAIL);
1948 ifp = ifnet_byindex(mreq.ipv6mr_interface);
1950 CTR3(KTR_MLD, "%s: ipv6mr_interface = %d, ifp = %p",
1951 __func__, mreq.ipv6mr_interface, ifp);
1954 case MCAST_JOIN_GROUP:
1955 case MCAST_JOIN_SOURCE_GROUP:
1956 if (sopt->sopt_name == MCAST_JOIN_GROUP) {
1957 error = sooptcopyin(sopt, &gsr,
1958 sizeof(struct group_req),
1959 sizeof(struct group_req));
1960 } else if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1961 error = sooptcopyin(sopt, &gsr,
1962 sizeof(struct group_source_req),
1963 sizeof(struct group_source_req));
1968 if (gsa->sin6.sin6_family != AF_INET6 ||
1969 gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1972 if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1973 if (ssa->sin6.sin6_family != AF_INET6 ||
1974 ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1976 if (IN6_IS_ADDR_MULTICAST(&ssa->sin6.sin6_addr))
1979 * TODO: Validate embedded scope ID in source
1980 * list entry against passed-in ifp, if and only
1981 * if source list filter entry is iface or node local.
1983 in6_clearscope(&ssa->sin6.sin6_addr);
1984 ssa->sin6.sin6_port = 0;
1985 ssa->sin6.sin6_scope_id = 0;
1988 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1989 return (EADDRNOTAVAIL);
1990 ifp = ifnet_byindex(gsr.gsr_interface);
1994 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
1995 __func__, sopt->sopt_name);
1996 return (EOPNOTSUPP);
2000 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
2003 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0)
2004 return (EADDRNOTAVAIL);
2006 gsa->sin6.sin6_port = 0;
2007 gsa->sin6.sin6_scope_id = 0;
2010 * Always set the scope zone ID on memberships created from userland.
2011 * Use the passed-in ifp to do this.
2012 * XXX The in6_setscope() return value is meaningless.
2013 * XXX SCOPE6_LOCK() is taken by in6_setscope().
2015 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
2017 imo = in6p_findmoptions(inp);
2018 idx = im6o_match_group(imo, ifp, &gsa->sa);
2022 inm = imo->im6o_membership[idx];
2023 imf = &imo->im6o_mfilters[idx];
2024 if (ssa->ss.ss_family != AF_UNSPEC) {
2026 * MCAST_JOIN_SOURCE_GROUP on an exclusive membership
2027 * is an error. On an existing inclusive membership,
2028 * it just adds the source to the filter list.
2030 if (imf->im6f_st[1] != MCAST_INCLUDE) {
2032 goto out_in6p_locked;
2035 * Throw out duplicates.
2037 * XXX FIXME: This makes a naive assumption that
2038 * even if entries exist for *ssa in this imf,
2039 * they will be rejected as dupes, even if they
2040 * are not valid in the current mode (in-mode).
2042 * in6_msource is transactioned just as for anything
2043 * else in SSM -- but note naive use of in6m_graft()
2044 * below for allocating new filter entries.
2046 * This is only an issue if someone mixes the
2047 * full-state SSM API with the delta-based API,
2048 * which is discouraged in the relevant RFCs.
2050 lims = im6o_match_source(imo, idx, &ssa->sa);
2051 if (lims != NULL /*&&
2052 lims->im6sl_st[1] == MCAST_INCLUDE*/) {
2053 error = EADDRNOTAVAIL;
2054 goto out_in6p_locked;
2058 * MCAST_JOIN_GROUP alone, on any existing membership,
2059 * is rejected, to stop the same inpcb tying up
2060 * multiple refs to the in_multi.
2061 * On an existing inclusive membership, this is also
2062 * an error; if you want to change filter mode,
2063 * you must use the userland API setsourcefilter().
2064 * XXX We don't reject this for imf in UNDEFINED
2065 * state at t1, because allocation of a filter
2066 * is atomic with allocation of a membership.
2069 goto out_in6p_locked;
2074 * Begin state merge transaction at socket layer.
2076 INP_WLOCK_ASSERT(inp);
2079 if (imo->im6o_num_memberships == imo->im6o_max_memberships) {
2080 error = im6o_grow(imo);
2082 goto out_in6p_locked;
2085 * Allocate the new slot upfront so we can deal with
2086 * grafting the new source filter in same code path
2087 * as for join-source on existing membership.
2089 idx = imo->im6o_num_memberships;
2090 imo->im6o_membership[idx] = NULL;
2091 imo->im6o_num_memberships++;
2092 KASSERT(imo->im6o_mfilters != NULL,
2093 ("%s: im6f_mfilters vector was not allocated", __func__));
2094 imf = &imo->im6o_mfilters[idx];
2095 KASSERT(RB_EMPTY(&imf->im6f_sources),
2096 ("%s: im6f_sources not empty", __func__));
2100 * Graft new source into filter list for this inpcb's
2101 * membership of the group. The in6_multi may not have
2102 * been allocated yet if this is a new membership, however,
2103 * the in_mfilter slot will be allocated and must be initialized.
2105 * Note: Grafting of exclusive mode filters doesn't happen
2107 * XXX: Should check for non-NULL lims (node exists but may
2108 * not be in-mode) for interop with full-state API.
2110 if (ssa->ss.ss_family != AF_UNSPEC) {
2111 /* Membership starts in IN mode */
2113 CTR1(KTR_MLD, "%s: new join w/source", __func__);
2114 im6f_init(imf, MCAST_UNDEFINED, MCAST_INCLUDE);
2116 CTR2(KTR_MLD, "%s: %s source", __func__, "allow");
2118 lims = im6f_graft(imf, MCAST_INCLUDE, &ssa->sin6);
2120 CTR1(KTR_MLD, "%s: merge imf state failed",
2126 /* No address specified; Membership starts in EX mode */
2128 CTR1(KTR_MLD, "%s: new join w/o source", __func__);
2129 im6f_init(imf, MCAST_UNDEFINED, MCAST_EXCLUDE);
2134 * Begin state merge transaction at MLD layer.
2141 error = in6_joingroup_locked(ifp, &gsa->sin6.sin6_addr, imf,
2147 imo->im6o_membership[idx] = inm;
2149 CTR1(KTR_MLD, "%s: merge inm state", __func__);
2150 IN6_MULTI_LIST_LOCK();
2151 error = in6m_merge(inm, imf);
2153 CTR1(KTR_MLD, "%s: failed to merge inm state",
2156 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
2157 error = mld_change_state(inm, 0);
2159 CTR1(KTR_MLD, "%s: failed mld downcall",
2162 IN6_MULTI_LIST_UNLOCK();
2167 if (in_pcbrele_wlocked(inp))
2180 if (error && is_new) {
2181 imo->im6o_membership[idx] = NULL;
2182 --imo->im6o_num_memberships;
2191 * Leave an IPv6 multicast group on an inpcb, possibly with a source.
2194 in6p_leave_group(struct inpcb *inp, struct sockopt *sopt)
2196 struct ipv6_mreq mreq;
2197 struct group_source_req gsr;
2198 sockunion_t *gsa, *ssa;
2200 struct in6_mfilter *imf;
2201 struct ip6_moptions *imo;
2202 struct in6_msource *ims;
2203 struct in6_multi *inm;
2206 int error, is_final;
2208 char ip6tbuf[INET6_ADDRSTRLEN];
2216 memset(&gsr, 0, sizeof(struct group_source_req));
2217 gsa = (sockunion_t *)&gsr.gsr_group;
2218 gsa->ss.ss_family = AF_UNSPEC;
2219 ssa = (sockunion_t *)&gsr.gsr_source;
2220 ssa->ss.ss_family = AF_UNSPEC;
2223 * Chew everything passed in up into a struct group_source_req
2224 * as that is easier to process.
2225 * Note: Any embedded scope ID in the multicast group passed
2226 * in by userland is ignored, the interface index is the recommended
2227 * mechanism to specify an interface; see below.
2229 switch (sopt->sopt_name) {
2230 case IPV6_LEAVE_GROUP:
2231 error = sooptcopyin(sopt, &mreq, sizeof(struct ipv6_mreq),
2232 sizeof(struct ipv6_mreq));
2235 gsa->sin6.sin6_family = AF_INET6;
2236 gsa->sin6.sin6_len = sizeof(struct sockaddr_in6);
2237 gsa->sin6.sin6_addr = mreq.ipv6mr_multiaddr;
2238 gsa->sin6.sin6_port = 0;
2239 gsa->sin6.sin6_scope_id = 0;
2240 ifindex = mreq.ipv6mr_interface;
2243 case MCAST_LEAVE_GROUP:
2244 case MCAST_LEAVE_SOURCE_GROUP:
2245 if (sopt->sopt_name == MCAST_LEAVE_GROUP) {
2246 error = sooptcopyin(sopt, &gsr,
2247 sizeof(struct group_req),
2248 sizeof(struct group_req));
2249 } else if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2250 error = sooptcopyin(sopt, &gsr,
2251 sizeof(struct group_source_req),
2252 sizeof(struct group_source_req));
2257 if (gsa->sin6.sin6_family != AF_INET6 ||
2258 gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
2260 if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2261 if (ssa->sin6.sin6_family != AF_INET6 ||
2262 ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
2264 if (IN6_IS_ADDR_MULTICAST(&ssa->sin6.sin6_addr))
2267 * TODO: Validate embedded scope ID in source
2268 * list entry against passed-in ifp, if and only
2269 * if source list filter entry is iface or node local.
2271 in6_clearscope(&ssa->sin6.sin6_addr);
2273 gsa->sin6.sin6_port = 0;
2274 gsa->sin6.sin6_scope_id = 0;
2275 ifindex = gsr.gsr_interface;
2279 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
2280 __func__, sopt->sopt_name);
2281 return (EOPNOTSUPP);
2285 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
2289 * Validate interface index if provided. If no interface index
2290 * was provided separately, attempt to look the membership up
2291 * from the default scope as a last resort to disambiguate
2292 * the membership we are being asked to leave.
2293 * XXX SCOPE6 lock potentially taken here.
2296 if (V_if_index < ifindex)
2297 return (EADDRNOTAVAIL);
2298 ifp = ifnet_byindex(ifindex);
2300 return (EADDRNOTAVAIL);
2301 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
2303 error = sa6_embedscope(&gsa->sin6, V_ip6_use_defzone);
2305 return (EADDRNOTAVAIL);
2307 * Some badly behaved applications don't pass an ifindex
2308 * or a scope ID, which is an API violation. In this case,
2309 * perform a lookup as per a v6 join.
2311 * XXX For now, stomp on zone ID for the corner case.
2312 * This is not the 'KAME way', but we need to see the ifp
2313 * directly until such time as this implementation is
2314 * refactored, assuming the scope IDs are the way to go.
2316 ifindex = ntohs(gsa->sin6.sin6_addr.s6_addr16[1]);
2318 CTR2(KTR_MLD, "%s: warning: no ifindex, looking up "
2319 "ifp for group %s.", __func__,
2320 ip6_sprintf(ip6tbuf, &gsa->sin6.sin6_addr));
2321 ifp = in6p_lookup_mcast_ifp(inp, &gsa->sin6);
2323 ifp = ifnet_byindex(ifindex);
2326 return (EADDRNOTAVAIL);
2329 CTR2(KTR_MLD, "%s: ifp = %p", __func__, ifp);
2330 KASSERT(ifp != NULL, ("%s: ifp did not resolve", __func__));
2333 * Find the membership in the membership array.
2335 imo = in6p_findmoptions(inp);
2336 idx = im6o_match_group(imo, ifp, &gsa->sa);
2338 error = EADDRNOTAVAIL;
2339 goto out_in6p_locked;
2341 inm = imo->im6o_membership[idx];
2342 imf = &imo->im6o_mfilters[idx];
2344 if (ssa->ss.ss_family != AF_UNSPEC)
2348 * Begin state merge transaction at socket layer.
2350 INP_WLOCK_ASSERT(inp);
2353 * If we were instructed only to leave a given source, do so.
2354 * MCAST_LEAVE_SOURCE_GROUP is only valid for inclusive memberships.
2359 if (imf->im6f_st[0] == MCAST_EXCLUDE) {
2360 error = EADDRNOTAVAIL;
2361 goto out_in6p_locked;
2363 ims = im6o_match_source(imo, idx, &ssa->sa);
2365 CTR3(KTR_MLD, "%s: source %p %spresent", __func__,
2366 ip6_sprintf(ip6tbuf, &ssa->sin6.sin6_addr),
2368 error = EADDRNOTAVAIL;
2369 goto out_in6p_locked;
2371 CTR2(KTR_MLD, "%s: %s source", __func__, "block");
2372 error = im6f_prune(imf, &ssa->sin6);
2374 CTR1(KTR_MLD, "%s: merge imf state failed",
2376 goto out_in6p_locked;
2381 * Begin state merge transaction at MLD layer.
2387 * Give up the multicast address record to which
2388 * the membership points.
2390 (void)in6_leavegroup_locked(inm, imf);
2392 CTR1(KTR_MLD, "%s: merge inm state", __func__);
2393 IN6_MULTI_LIST_LOCK();
2394 error = in6m_merge(inm, imf);
2396 CTR1(KTR_MLD, "%s: failed to merge inm state",
2399 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
2400 error = mld_change_state(inm, 0);
2402 CTR1(KTR_MLD, "%s: failed mld downcall",
2405 IN6_MULTI_LIST_UNLOCK();
2418 /* Remove the gap in the membership array. */
2419 for (++idx; idx < imo->im6o_num_memberships; ++idx) {
2420 imo->im6o_membership[idx-1] = imo->im6o_membership[idx];
2421 imo->im6o_mfilters[idx-1] = imo->im6o_mfilters[idx];
2423 imo->im6o_num_memberships--;
2432 * Select the interface for transmitting IPv6 multicast datagrams.
2434 * Either an instance of struct in6_addr or an instance of struct ipv6_mreqn
2435 * may be passed to this socket option. An address of in6addr_any or an
2436 * interface index of 0 is used to remove a previous selection.
2437 * When no interface is selected, one is chosen for every send.
2440 in6p_set_multicast_if(struct inpcb *inp, struct sockopt *sopt)
2443 struct ip6_moptions *imo;
2447 if (sopt->sopt_valsize != sizeof(u_int))
2450 error = sooptcopyin(sopt, &ifindex, sizeof(u_int), sizeof(u_int));
2453 if (V_if_index < ifindex)
2458 ifp = ifnet_byindex(ifindex);
2461 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2462 return (EADDRNOTAVAIL);
2464 imo = in6p_findmoptions(inp);
2465 imo->im6o_multicast_ifp = ifp;
2472 * Atomically set source filters on a socket for an IPv6 multicast group.
2474 * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
2477 in6p_set_source_filters(struct inpcb *inp, struct sockopt *sopt)
2479 struct __msfilterreq msfr;
2482 struct in6_mfilter *imf;
2483 struct ip6_moptions *imo;
2484 struct in6_multi *inm;
2488 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
2489 sizeof(struct __msfilterreq));
2493 if (msfr.msfr_nsrcs > in6_mcast_maxsocksrc)
2496 if (msfr.msfr_fmode != MCAST_EXCLUDE &&
2497 msfr.msfr_fmode != MCAST_INCLUDE)
2500 if (msfr.msfr_group.ss_family != AF_INET6 ||
2501 msfr.msfr_group.ss_len != sizeof(struct sockaddr_in6))
2504 gsa = (sockunion_t *)&msfr.msfr_group;
2505 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
2508 gsa->sin6.sin6_port = 0; /* ignore port */
2510 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
2511 return (EADDRNOTAVAIL);
2512 ifp = ifnet_byindex(msfr.msfr_ifindex);
2514 return (EADDRNOTAVAIL);
2515 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
2518 * Take the INP write lock.
2519 * Check if this socket is a member of this group.
2521 imo = in6p_findmoptions(inp);
2522 idx = im6o_match_group(imo, ifp, &gsa->sa);
2523 if (idx == -1 || imo->im6o_mfilters == NULL) {
2524 error = EADDRNOTAVAIL;
2525 goto out_in6p_locked;
2527 inm = imo->im6o_membership[idx];
2528 imf = &imo->im6o_mfilters[idx];
2531 * Begin state merge transaction at socket layer.
2533 INP_WLOCK_ASSERT(inp);
2535 imf->im6f_st[1] = msfr.msfr_fmode;
2538 * Apply any new source filters, if present.
2539 * Make a copy of the user-space source vector so
2540 * that we may copy them with a single copyin. This
2541 * allows us to deal with page faults up-front.
2543 if (msfr.msfr_nsrcs > 0) {
2544 struct in6_msource *lims;
2545 struct sockaddr_in6 *psin;
2546 struct sockaddr_storage *kss, *pkss;
2551 CTR2(KTR_MLD, "%s: loading %lu source list entries",
2552 __func__, (unsigned long)msfr.msfr_nsrcs);
2553 kss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
2555 error = copyin(msfr.msfr_srcs, kss,
2556 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
2565 * Mark all source filters as UNDEFINED at t1.
2566 * Restore new group filter mode, as im6f_leave()
2567 * will set it to INCLUDE.
2570 imf->im6f_st[1] = msfr.msfr_fmode;
2573 * Update socket layer filters at t1, lazy-allocating
2574 * new entries. This saves a bunch of memory at the
2575 * cost of one RB_FIND() per source entry; duplicate
2576 * entries in the msfr_nsrcs vector are ignored.
2577 * If we encounter an error, rollback transaction.
2579 * XXX This too could be replaced with a set-symmetric
2580 * difference like loop to avoid walking from root
2581 * every time, as the key space is common.
2583 for (i = 0, pkss = kss; i < msfr.msfr_nsrcs; i++, pkss++) {
2584 psin = (struct sockaddr_in6 *)pkss;
2585 if (psin->sin6_family != AF_INET6) {
2586 error = EAFNOSUPPORT;
2589 if (psin->sin6_len != sizeof(struct sockaddr_in6)) {
2593 if (IN6_IS_ADDR_MULTICAST(&psin->sin6_addr)) {
2598 * TODO: Validate embedded scope ID in source
2599 * list entry against passed-in ifp, if and only
2600 * if source list filter entry is iface or node local.
2602 in6_clearscope(&psin->sin6_addr);
2603 error = im6f_get_source(imf, psin, &lims);
2606 lims->im6sl_st[1] = imf->im6f_st[1];
2612 goto out_im6f_rollback;
2614 INP_WLOCK_ASSERT(inp);
2615 IN6_MULTI_LIST_LOCK();
2618 * Begin state merge transaction at MLD layer.
2620 CTR1(KTR_MLD, "%s: merge inm state", __func__);
2621 error = in6m_merge(inm, imf);
2623 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
2625 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
2626 error = mld_change_state(inm, 0);
2628 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
2631 IN6_MULTI_LIST_UNLOCK();
2647 * Set the IP multicast options in response to user setsockopt().
2649 * Many of the socket options handled in this function duplicate the
2650 * functionality of socket options in the regular unicast API. However,
2651 * it is not possible to merge the duplicate code, because the idempotence
2652 * of the IPv6 multicast part of the BSD Sockets API must be preserved;
2653 * the effects of these options must be treated as separate and distinct.
2655 * SMPng: XXX: Unlocked read of inp_socket believed OK.
2658 ip6_setmoptions(struct inpcb *inp, struct sockopt *sopt)
2660 struct ip6_moptions *im6o;
2666 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
2667 * or is a divert socket, reject it.
2669 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
2670 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
2671 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM))
2672 return (EOPNOTSUPP);
2674 switch (sopt->sopt_name) {
2675 case IPV6_MULTICAST_IF:
2676 error = in6p_set_multicast_if(inp, sopt);
2679 case IPV6_MULTICAST_HOPS: {
2682 if (sopt->sopt_valsize != sizeof(int)) {
2686 error = sooptcopyin(sopt, &hlim, sizeof(hlim), sizeof(int));
2689 if (hlim < -1 || hlim > 255) {
2692 } else if (hlim == -1) {
2693 hlim = V_ip6_defmcasthlim;
2695 im6o = in6p_findmoptions(inp);
2696 im6o->im6o_multicast_hlim = hlim;
2701 case IPV6_MULTICAST_LOOP: {
2705 * Set the loopback flag for outgoing multicast packets.
2706 * Must be zero or one.
2708 if (sopt->sopt_valsize != sizeof(u_int)) {
2712 error = sooptcopyin(sopt, &loop, sizeof(u_int), sizeof(u_int));
2719 im6o = in6p_findmoptions(inp);
2720 im6o->im6o_multicast_loop = loop;
2725 case IPV6_JOIN_GROUP:
2726 case MCAST_JOIN_GROUP:
2727 case MCAST_JOIN_SOURCE_GROUP:
2728 error = in6p_join_group(inp, sopt);
2731 case IPV6_LEAVE_GROUP:
2732 case MCAST_LEAVE_GROUP:
2733 case MCAST_LEAVE_SOURCE_GROUP:
2734 error = in6p_leave_group(inp, sopt);
2737 case MCAST_BLOCK_SOURCE:
2738 case MCAST_UNBLOCK_SOURCE:
2739 error = in6p_block_unblock_source(inp, sopt);
2743 error = in6p_set_source_filters(inp, sopt);
2751 INP_UNLOCK_ASSERT(inp);
2757 * Expose MLD's multicast filter mode and source list(s) to userland,
2758 * keyed by (ifindex, group).
2759 * The filter mode is written out as a uint32_t, followed by
2760 * 0..n of struct in6_addr.
2761 * For use by ifmcstat(8).
2762 * SMPng: NOTE: unlocked read of ifindex space.
2765 sysctl_ip6_mcast_filters(SYSCTL_HANDLER_ARGS)
2767 struct in6_addr mcaddr;
2768 struct in6_addr src;
2770 struct ifmultiaddr *ifma;
2771 struct in6_multi *inm;
2772 struct ip6_msource *ims;
2776 uint32_t fmode, ifindex;
2778 char ip6tbuf[INET6_ADDRSTRLEN];
2784 if (req->newptr != NULL)
2787 /* int: ifindex + 4 * 32 bits of IPv6 address */
2792 if (ifindex <= 0 || ifindex > V_if_index) {
2793 CTR2(KTR_MLD, "%s: ifindex %u out of range",
2798 memcpy(&mcaddr, &name[1], sizeof(struct in6_addr));
2799 if (!IN6_IS_ADDR_MULTICAST(&mcaddr)) {
2800 CTR2(KTR_MLD, "%s: group %s is not multicast",
2801 __func__, ip6_sprintf(ip6tbuf, &mcaddr));
2805 ifp = ifnet_byindex(ifindex);
2807 CTR2(KTR_MLD, "%s: no ifp for ifindex %u",
2812 * Internal MLD lookups require that scope/zone ID is set.
2814 (void)in6_setscope(&mcaddr, ifp, NULL);
2816 retval = sysctl_wire_old_buffer(req,
2817 sizeof(uint32_t) + (in6_mcast_maxgrpsrc * sizeof(struct in6_addr)));
2822 IN6_MULTI_LIST_LOCK();
2824 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2825 if (ifma->ifma_addr->sa_family != AF_INET6 ||
2826 ifma->ifma_protospec == NULL)
2828 inm = (struct in6_multi *)ifma->ifma_protospec;
2829 if (!IN6_ARE_ADDR_EQUAL(&inm->in6m_addr, &mcaddr))
2831 fmode = inm->in6m_st[1].iss_fmode;
2832 retval = SYSCTL_OUT(req, &fmode, sizeof(uint32_t));
2835 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
2836 CTR2(KTR_MLD, "%s: visit node %p", __func__, ims);
2838 * Only copy-out sources which are in-mode.
2840 if (fmode != im6s_get_mode(inm, ims, 1)) {
2841 CTR1(KTR_MLD, "%s: skip non-in-mode",
2845 src = ims->im6s_addr;
2846 retval = SYSCTL_OUT(req, &src,
2847 sizeof(struct in6_addr));
2852 IF_ADDR_RUNLOCK(ifp);
2854 IN6_MULTI_LIST_UNLOCK();
2862 static const char *in6m_modestrs[] = { "un", "in", "ex" };
2865 in6m_mode_str(const int mode)
2868 if (mode >= MCAST_UNDEFINED && mode <= MCAST_EXCLUDE)
2869 return (in6m_modestrs[mode]);
2873 static const char *in6m_statestrs[] = {
2886 in6m_state_str(const int state)
2889 if (state >= MLD_NOT_MEMBER && state <= MLD_LEAVING_MEMBER)
2890 return (in6m_statestrs[state]);
2895 * Dump an in6_multi structure to the console.
2898 in6m_print(const struct in6_multi *inm)
2901 char ip6tbuf[INET6_ADDRSTRLEN];
2903 if ((ktr_mask & KTR_MLD) == 0)
2906 printf("%s: --- begin in6m %p ---\n", __func__, inm);
2907 printf("addr %s ifp %p(%s) ifma %p\n",
2908 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2910 if_name(inm->in6m_ifp),
2912 printf("timer %u state %s refcount %u scq.len %u\n",
2914 in6m_state_str(inm->in6m_state),
2916 mbufq_len(&inm->in6m_scq));
2917 printf("mli %p nsrc %lu sctimer %u scrv %u\n",
2922 for (t = 0; t < 2; t++) {
2923 printf("t%d: fmode %s asm %u ex %u in %u rec %u\n", t,
2924 in6m_mode_str(inm->in6m_st[t].iss_fmode),
2925 inm->in6m_st[t].iss_asm,
2926 inm->in6m_st[t].iss_ex,
2927 inm->in6m_st[t].iss_in,
2928 inm->in6m_st[t].iss_rec);
2930 printf("%s: --- end in6m %p ---\n", __func__, inm);
2936 in6m_print(const struct in6_multi *inm)