FreeBSD kernel IPv6 code
in6_mcast.c
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1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009 Bruce Simpson.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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
17 * permission.
18 *
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
29 * SUCH DAMAGE.
30 */
31
32/*
33 * IPv6 multicast socket, group, and socket option processing module.
34 * Normative references: RFC 2292, RFC 3492, RFC 3542, RFC 3678, RFC 3810.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD$");
39
40#include "opt_inet6.h"
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/kernel.h>
45#include <sys/ktr.h>
46#include <sys/malloc.h>
47#include <sys/mbuf.h>
48#include <sys/protosw.h>
49#include <sys/socket.h>
50#include <sys/socketvar.h>
51#include <sys/sysctl.h>
52#include <sys/priv.h>
53#include <sys/taskqueue.h>
54#include <sys/tree.h>
55
56#include <net/if.h>
57#include <net/if_var.h>
58#include <net/if_dl.h>
59#include <net/route.h>
60#include <net/route/nhop.h>
61#include <net/vnet.h>
62
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>
78
79#ifndef KTR_MLD
80#define KTR_MLD KTR_INET6
81#endif
82
83#ifndef __SOCKUNION_DECLARED
84union sockunion {
85 struct sockaddr_storage ss;
86 struct sockaddr sa;
87 struct sockaddr_dl sdl;
88 struct sockaddr_in6 sin6;
89};
90typedef union sockunion sockunion_t;
91#define __SOCKUNION_DECLARED
92#endif /* __SOCKUNION_DECLARED */
93
94static MALLOC_DEFINE(M_IN6MFILTER, "in6_mfilter",
95 "IPv6 multicast PCB-layer source filter");
96MALLOC_DEFINE(M_IP6MADDR, "in6_multi", "IPv6 multicast group");
97static MALLOC_DEFINE(M_IP6MOPTS, "ip6_moptions", "IPv6 multicast options");
98static MALLOC_DEFINE(M_IP6MSOURCE, "ip6_msource",
99 "IPv6 multicast MLD-layer source filter");
100
101RB_GENERATE(ip6_msource_tree, ip6_msource, im6s_link, ip6_msource_cmp);
102
103/*
104 * Locking:
105 * - Lock order is: Giant, IN6_MULTI_LOCK, INP_WLOCK,
106 * IN6_MULTI_LIST_LOCK, MLD_LOCK, IF_ADDR_LOCK.
107 * - The IF_ADDR_LOCK is implicitly taken by in6m_lookup() earlier, however
108 * it can be taken by code in net/if.c also.
109 * - ip6_moptions and in6_mfilter are covered by the INP_WLOCK.
110 *
111 * struct in6_multi is covered by IN6_MULTI_LOCK. There isn't strictly
112 * any need for in6_multi itself to be virtualized -- it is bound to an ifp
113 * anyway no matter what happens.
114 */
115struct mtx in6_multi_list_mtx;
116MTX_SYSINIT(in6_multi_mtx, &in6_multi_list_mtx, "in6_multi_list_mtx", MTX_DEF);
117
118struct mtx in6_multi_free_mtx;
119MTX_SYSINIT(in6_multi_free_mtx, &in6_multi_free_mtx, "in6_multi_free_mtx", MTX_DEF);
120
121struct sx in6_multi_sx;
122SX_SYSINIT(in6_multi_sx, &in6_multi_sx, "in6_multi_sx");
123
124static void im6f_commit(struct in6_mfilter *);
125static int im6f_get_source(struct in6_mfilter *imf,
126 const struct sockaddr_in6 *psin,
127 struct in6_msource **);
128static struct in6_msource *
129 im6f_graft(struct in6_mfilter *, const uint8_t,
130 const struct sockaddr_in6 *);
131static void im6f_leave(struct in6_mfilter *);
132static int im6f_prune(struct in6_mfilter *, const struct sockaddr_in6 *);
133static void im6f_purge(struct in6_mfilter *);
134static void im6f_rollback(struct in6_mfilter *);
135static void im6f_reap(struct in6_mfilter *);
136static struct in6_mfilter *
137 im6o_match_group(const struct ip6_moptions *,
138 const struct ifnet *, const struct sockaddr *);
139static struct in6_msource *
140 im6o_match_source(struct in6_mfilter *, const struct sockaddr *);
141static void im6s_merge(struct ip6_msource *ims,
142 const struct in6_msource *lims, const int rollback);
143static int in6_getmulti(struct ifnet *, const struct in6_addr *,
144 struct in6_multi **);
145static int in6_joingroup_locked(struct ifnet *, const struct in6_addr *,
146 struct in6_mfilter *, struct in6_multi **, int);
147static int in6m_get_source(struct in6_multi *inm,
148 const struct in6_addr *addr, const int noalloc,
149 struct ip6_msource **pims);
150#ifdef KTR
151static int in6m_is_ifp_detached(const struct in6_multi *);
152#endif
153static int in6m_merge(struct in6_multi *, /*const*/ struct in6_mfilter *);
154static void in6m_purge(struct in6_multi *);
155static void in6m_reap(struct in6_multi *);
156static struct ip6_moptions *
157 in6p_findmoptions(struct inpcb *);
158static int in6p_get_source_filters(struct inpcb *, struct sockopt *);
159static int in6p_join_group(struct inpcb *, struct sockopt *);
160static int in6p_leave_group(struct inpcb *, struct sockopt *);
161static struct ifnet *
162 in6p_lookup_mcast_ifp(const struct inpcb *,
163 const struct sockaddr_in6 *);
164static int in6p_block_unblock_source(struct inpcb *, struct sockopt *);
165static int in6p_set_multicast_if(struct inpcb *, struct sockopt *);
166static int in6p_set_source_filters(struct inpcb *, struct sockopt *);
167static int sysctl_ip6_mcast_filters(SYSCTL_HANDLER_ARGS);
168
169SYSCTL_DECL(_net_inet6_ip6); /* XXX Not in any common header. */
170
171static SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, mcast,
172 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
173 "IPv6 multicast");
174
175static u_long in6_mcast_maxgrpsrc = IPV6_MAX_GROUP_SRC_FILTER;
176SYSCTL_ULONG(_net_inet6_ip6_mcast, OID_AUTO, maxgrpsrc,
177 CTLFLAG_RWTUN, &in6_mcast_maxgrpsrc, 0,
178 "Max source filters per group");
179
180static u_long in6_mcast_maxsocksrc = IPV6_MAX_SOCK_SRC_FILTER;
181SYSCTL_ULONG(_net_inet6_ip6_mcast, OID_AUTO, maxsocksrc,
182 CTLFLAG_RWTUN, &in6_mcast_maxsocksrc, 0,
183 "Max source filters per socket");
184
185/* TODO Virtualize this switch. */
186int in6_mcast_loop = IPV6_DEFAULT_MULTICAST_LOOP;
187SYSCTL_INT(_net_inet6_ip6_mcast, OID_AUTO, loop, CTLFLAG_RWTUN,
188 &in6_mcast_loop, 0, "Loopback multicast datagrams by default");
189
190static SYSCTL_NODE(_net_inet6_ip6_mcast, OID_AUTO, filters,
191 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ip6_mcast_filters,
192 "Per-interface stack-wide source filters");
193
194#ifdef KTR
195/*
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
198 * is detached.
199 */
200static int __inline
201in6m_is_ifp_detached(const struct in6_multi *inm)
202{
203 struct ifnet *ifp;
204
205 KASSERT(inm->in6m_ifma != NULL, ("%s: no ifma", __func__));
206 ifp = inm->in6m_ifma->ifma_ifp;
207 if (ifp != NULL) {
208 /*
209 * Sanity check that network-layer notion of ifp is the
210 * same as that of link-layer.
211 */
212 KASSERT(inm->in6m_ifp == ifp, ("%s: bad ifp", __func__));
213 }
214
215 return (ifp == NULL);
216}
217#endif
218
219/*
220 * Initialize an in6_mfilter structure to a known state at t0, t1
221 * with an empty source filter list.
222 */
223static __inline void
224im6f_init(struct in6_mfilter *imf, const int st0, const int st1)
225{
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;
230}
231
232struct in6_mfilter *
233ip6_mfilter_alloc(const int mflags, const int st0, const int st1)
234{
235 struct in6_mfilter *imf;
236
237 imf = malloc(sizeof(*imf), M_IN6MFILTER, mflags);
238
239 if (imf != NULL)
240 im6f_init(imf, st0, st1);
241
242 return (imf);
243}
244
245void
246ip6_mfilter_free(struct in6_mfilter *imf)
247{
248
249 im6f_purge(imf);
250 free(imf, M_IN6MFILTER);
251}
252
253/*
254 * Find an IPv6 multicast group entry for this ip6_moptions instance
255 * which matches the specified group, and optionally an interface.
256 * Return its index into the array, or -1 if not found.
257 */
258static struct in6_mfilter *
259im6o_match_group(const struct ip6_moptions *imo, const struct ifnet *ifp,
260 const struct sockaddr *group)
261{
262 const struct sockaddr_in6 *gsin6;
263 struct in6_mfilter *imf;
264 struct in6_multi *inm;
265
266 gsin6 = (const struct sockaddr_in6 *)group;
267
268 IP6_MFILTER_FOREACH(imf, &imo->im6o_head) {
269 inm = imf->im6f_in6m;
270 if (inm == NULL)
271 continue;
272 if ((ifp == NULL || (inm->in6m_ifp == ifp)) &&
273 IN6_ARE_ADDR_EQUAL(&inm->in6m_addr,
274 &gsin6->sin6_addr)) {
275 break;
276 }
277 }
278 return (imf);
279}
280
281/*
282 * Find an IPv6 multicast source entry for this imo which matches
283 * the given group index for this socket, and source address.
284 *
285 * XXX TODO: The scope ID, if present in src, is stripped before
286 * any comparison. We SHOULD enforce scope/zone checks where the source
287 * filter entry has a link scope.
288 *
289 * NOTE: This does not check if the entry is in-mode, merely if
290 * it exists, which may not be the desired behaviour.
291 */
292static struct in6_msource *
293im6o_match_source(struct in6_mfilter *imf, const struct sockaddr *src)
294{
295 struct ip6_msource find;
296 struct ip6_msource *ims;
297 const sockunion_t *psa;
298
299 KASSERT(src->sa_family == AF_INET6, ("%s: !AF_INET6", __func__));
300
301 psa = (const sockunion_t *)src;
302 find.im6s_addr = psa->sin6.sin6_addr;
303 in6_clearscope(&find.im6s_addr); /* XXX */
304 ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
305
306 return ((struct in6_msource *)ims);
307}
308
309/*
310 * Perform filtering for multicast datagrams on a socket by group and source.
311 *
312 * Returns 0 if a datagram should be allowed through, or various error codes
313 * if the socket was not a member of the group, or the source was muted, etc.
314 */
315int
316im6o_mc_filter(const struct ip6_moptions *imo, const struct ifnet *ifp,
317 const struct sockaddr *group, const struct sockaddr *src)
318{
319 struct in6_mfilter *imf;
320 struct in6_msource *ims;
321 int mode;
322
323 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
324
325 imf = im6o_match_group(imo, ifp, group);
326 if (imf == NULL)
327 return (MCAST_NOTGMEMBER);
328
329 /*
330 * Check if the source was included in an (S,G) join.
331 * Allow reception on exclusive memberships by default,
332 * reject reception on inclusive memberships by default.
333 * Exclude source only if an in-mode exclude filter exists.
334 * Include source only if an in-mode include filter exists.
335 * NOTE: We are comparing group state here at MLD t1 (now)
336 * with socket-layer t0 (since last downcall).
337 */
338 mode = imf->im6f_st[1];
339 ims = im6o_match_source(imf, src);
340
341 if ((ims == NULL && mode == MCAST_INCLUDE) ||
342 (ims != NULL && ims->im6sl_st[0] != mode))
343 return (MCAST_NOTSMEMBER);
344
345 return (MCAST_PASS);
346}
347
348/*
349 * Find and return a reference to an in6_multi record for (ifp, group),
350 * and bump its reference count.
351 * If one does not exist, try to allocate it, and update link-layer multicast
352 * filters on ifp to listen for group.
353 * Assumes the IN6_MULTI lock is held across the call.
354 * Return 0 if successful, otherwise return an appropriate error code.
355 */
356static int
357in6_getmulti(struct ifnet *ifp, const struct in6_addr *group,
358 struct in6_multi **pinm)
359{
360 struct epoch_tracker et;
361 struct sockaddr_in6 gsin6;
362 struct ifmultiaddr *ifma;
363 struct in6_multi *inm;
364 int error;
365
366 error = 0;
367
368 /*
369 * XXX: Accesses to ifma_protospec must be covered by IF_ADDR_LOCK;
370 * if_addmulti() takes this mutex itself, so we must drop and
371 * re-acquire around the call.
372 */
373 IN6_MULTI_LOCK_ASSERT();
374 IN6_MULTI_LIST_LOCK();
375 IF_ADDR_WLOCK(ifp);
376 NET_EPOCH_ENTER(et);
377 /*
378 * Does ifp support IPv6 multicasts?
379 */
380 if (ifp->if_afdata[AF_INET6] == NULL)
381 error = ENODEV;
382 else
383 inm = in6m_lookup_locked(ifp, group);
384 NET_EPOCH_EXIT(et);
385
386 if (error != 0)
387 goto out_locked;
388
389 if (inm != NULL) {
390 /*
391 * If we already joined this group, just bump the
392 * refcount and return it.
393 */
394 KASSERT(inm->in6m_refcount >= 1,
395 ("%s: bad refcount %d", __func__, inm->in6m_refcount));
396 in6m_acquire_locked(inm);
397 *pinm = inm;
398 goto out_locked;
399 }
400
401 memset(&gsin6, 0, sizeof(gsin6));
402 gsin6.sin6_family = AF_INET6;
403 gsin6.sin6_len = sizeof(struct sockaddr_in6);
404 gsin6.sin6_addr = *group;
405
406 /*
407 * Check if a link-layer group is already associated
408 * with this network-layer group on the given ifnet.
409 */
410 IN6_MULTI_LIST_UNLOCK();
411 IF_ADDR_WUNLOCK(ifp);
412 error = if_addmulti(ifp, (struct sockaddr *)&gsin6, &ifma);
413 if (error != 0)
414 return (error);
415 IN6_MULTI_LIST_LOCK();
416 IF_ADDR_WLOCK(ifp);
417
418 /*
419 * If something other than netinet6 is occupying the link-layer
420 * group, print a meaningful error message and back out of
421 * the allocation.
422 * Otherwise, bump the refcount on the existing network-layer
423 * group association and return it.
424 */
425 if (ifma->ifma_protospec != NULL) {
426 inm = (struct in6_multi *)ifma->ifma_protospec;
427#ifdef INVARIANTS
428 KASSERT(ifma->ifma_addr != NULL, ("%s: no ifma_addr",
429 __func__));
430 KASSERT(ifma->ifma_addr->sa_family == AF_INET6,
431 ("%s: ifma not AF_INET6", __func__));
432 KASSERT(inm != NULL, ("%s: no ifma_protospec", __func__));
433 if (inm->in6m_ifma != ifma || inm->in6m_ifp != ifp ||
434 !IN6_ARE_ADDR_EQUAL(&inm->in6m_addr, group))
435 panic("%s: ifma %p is inconsistent with %p (%p)",
436 __func__, ifma, inm, group);
437#endif
438 in6m_acquire_locked(inm);
439 *pinm = inm;
440 goto out_locked;
441 }
442
443 IF_ADDR_WLOCK_ASSERT(ifp);
444
445 /*
446 * A new in6_multi record is needed; allocate and initialize it.
447 * We DO NOT perform an MLD join as the in6_ layer may need to
448 * push an initial source list down to MLD to support SSM.
449 *
450 * The initial source filter state is INCLUDE, {} as per the RFC.
451 * Pending state-changes per group are subject to a bounds check.
452 */
453 inm = malloc(sizeof(*inm), M_IP6MADDR, M_NOWAIT | M_ZERO);
454 if (inm == NULL) {
455 IN6_MULTI_LIST_UNLOCK();
456 IF_ADDR_WUNLOCK(ifp);
457 if_delmulti_ifma(ifma);
458 return (ENOMEM);
459 }
460 inm->in6m_addr = *group;
461 inm->in6m_ifp = ifp;
462 inm->in6m_mli = MLD_IFINFO(ifp);
463 inm->in6m_ifma = ifma;
464 inm->in6m_refcount = 1;
465 inm->in6m_state = MLD_NOT_MEMBER;
466 mbufq_init(&inm->in6m_scq, MLD_MAX_STATE_CHANGES);
467
468 inm->in6m_st[0].iss_fmode = MCAST_UNDEFINED;
469 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
470 RB_INIT(&inm->in6m_srcs);
471
472 ifma->ifma_protospec = inm;
473 *pinm = inm;
474
475 out_locked:
476 IN6_MULTI_LIST_UNLOCK();
477 IF_ADDR_WUNLOCK(ifp);
478 return (error);
479}
480
481/*
482 * Drop a reference to an in6_multi record.
483 *
484 * If the refcount drops to 0, free the in6_multi record and
485 * delete the underlying link-layer membership.
486 */
487static void
488in6m_release(struct in6_multi *inm)
489{
490 struct ifmultiaddr *ifma;
491 struct ifnet *ifp;
492
493 CTR2(KTR_MLD, "%s: refcount is %d", __func__, inm->in6m_refcount);
494
495 MPASS(inm->in6m_refcount == 0);
496 CTR2(KTR_MLD, "%s: freeing inm %p", __func__, inm);
497
498 ifma = inm->in6m_ifma;
499 ifp = inm->in6m_ifp;
500 MPASS(ifma->ifma_llifma == NULL);
501
502 /* XXX this access is not covered by IF_ADDR_LOCK */
503 CTR2(KTR_MLD, "%s: purging ifma %p", __func__, ifma);
504 KASSERT(ifma->ifma_protospec == NULL,
505 ("%s: ifma_protospec != NULL", __func__));
506 if (ifp == NULL)
507 ifp = ifma->ifma_ifp;
508
509 if (ifp != NULL) {
510 CURVNET_SET(ifp->if_vnet);
511 in6m_purge(inm);
512 free(inm, M_IP6MADDR);
513 if_delmulti_ifma_flags(ifma, 1);
514 CURVNET_RESTORE();
515 if_rele(ifp);
516 } else {
517 in6m_purge(inm);
518 free(inm, M_IP6MADDR);
519 if_delmulti_ifma_flags(ifma, 1);
520 }
521}
522
523/*
524 * Interface detach can happen in a taskqueue thread context, so we must use a
525 * dedicated thread to avoid deadlocks when draining in6m_release tasks.
526 */
527TASKQUEUE_DEFINE_THREAD(in6m_free);
528static struct in6_multi_head in6m_free_list = SLIST_HEAD_INITIALIZER();
529static void in6m_release_task(void *arg __unused, int pending __unused);
530static struct task in6m_free_task = TASK_INITIALIZER(0, in6m_release_task, NULL);
531
532void
533in6m_release_list_deferred(struct in6_multi_head *inmh)
534{
535 if (SLIST_EMPTY(inmh))
536 return;
537 mtx_lock(&in6_multi_free_mtx);
538 SLIST_CONCAT(&in6m_free_list, inmh, in6_multi, in6m_nrele);
539 mtx_unlock(&in6_multi_free_mtx);
540 taskqueue_enqueue(taskqueue_in6m_free, &in6m_free_task);
541}
542
543void
544in6m_release_wait(void *arg __unused)
545{
546
547 /*
548 * Make sure all pending multicast addresses are freed before
549 * the VNET or network device is destroyed:
550 */
551 taskqueue_drain_all(taskqueue_in6m_free);
552}
553#ifdef VIMAGE
554/* XXX-BZ FIXME, see D24914. */
555VNET_SYSUNINIT(in6m_release_wait, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, in6m_release_wait, NULL);
556#endif
557
558void
559in6m_disconnect_locked(struct in6_multi_head *inmh, struct in6_multi *inm)
560{
561 struct ifnet *ifp;
562 struct ifaddr *ifa;
563 struct in6_ifaddr *ifa6;
564 struct in6_multi_mship *imm, *imm_tmp;
565 struct ifmultiaddr *ifma, *ll_ifma;
566
567 IN6_MULTI_LIST_LOCK_ASSERT();
568
569 ifp = inm->in6m_ifp;
570 if (ifp == NULL)
571 return; /* already called */
572
573 inm->in6m_ifp = NULL;
574 IF_ADDR_WLOCK_ASSERT(ifp);
575 ifma = inm->in6m_ifma;
576 if (ifma == NULL)
577 return;
578
579 if_ref(ifp);
580 if (ifma->ifma_flags & IFMA_F_ENQUEUED) {
581 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link);
582 ifma->ifma_flags &= ~IFMA_F_ENQUEUED;
583 }
584 MCDPRINTF("removed ifma: %p from %s\n", ifma, ifp->if_xname);
585 if ((ll_ifma = ifma->ifma_llifma) != NULL) {
586 MPASS(ifma != ll_ifma);
587 ifma->ifma_llifma = NULL;
588 MPASS(ll_ifma->ifma_llifma == NULL);
589 MPASS(ll_ifma->ifma_ifp == ifp);
590 if (--ll_ifma->ifma_refcount == 0) {
591 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) {
592 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, ifma_link);
593 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED;
594 }
595 MCDPRINTF("removed ll_ifma: %p from %s\n", ll_ifma, ifp->if_xname);
596 if_freemulti(ll_ifma);
597 }
598 }
599 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
600 if (ifa->ifa_addr->sa_family != AF_INET6)
601 continue;
602 ifa6 = (void *)ifa;
603 LIST_FOREACH_SAFE(imm, &ifa6->ia6_memberships,
604 i6mm_chain, imm_tmp) {
605 if (inm == imm->i6mm_maddr) {
606 LIST_REMOVE(imm, i6mm_chain);
607 free(imm, M_IP6MADDR);
608 in6m_rele_locked(inmh, inm);
609 }
610 }
611 }
612}
613
614static void
615in6m_release_task(void *arg __unused, int pending __unused)
616{
617 struct in6_multi_head in6m_free_tmp;
618 struct in6_multi *inm, *tinm;
619
620 SLIST_INIT(&in6m_free_tmp);
621 mtx_lock(&in6_multi_free_mtx);
622 SLIST_CONCAT(&in6m_free_tmp, &in6m_free_list, in6_multi, in6m_nrele);
623 mtx_unlock(&in6_multi_free_mtx);
624 IN6_MULTI_LOCK();
625 SLIST_FOREACH_SAFE(inm, &in6m_free_tmp, in6m_nrele, tinm) {
626 SLIST_REMOVE_HEAD(&in6m_free_tmp, in6m_nrele);
627 in6m_release(inm);
628 }
629 IN6_MULTI_UNLOCK();
630}
631
632/*
633 * Clear recorded source entries for a group.
634 * Used by the MLD code. Caller must hold the IN6_MULTI lock.
635 * FIXME: Should reap.
636 */
637void
638in6m_clear_recorded(struct in6_multi *inm)
639{
640 struct ip6_msource *ims;
641
642 IN6_MULTI_LIST_LOCK_ASSERT();
643
644 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
645 if (ims->im6s_stp) {
646 ims->im6s_stp = 0;
647 --inm->in6m_st[1].iss_rec;
648 }
649 }
650 KASSERT(inm->in6m_st[1].iss_rec == 0,
651 ("%s: iss_rec %d not 0", __func__, inm->in6m_st[1].iss_rec));
652}
653
654/*
655 * Record a source as pending for a Source-Group MLDv2 query.
656 * This lives here as it modifies the shared tree.
657 *
658 * inm is the group descriptor.
659 * naddr is the address of the source to record in network-byte order.
660 *
661 * If the net.inet6.mld.sgalloc sysctl is non-zero, we will
662 * lazy-allocate a source node in response to an SG query.
663 * Otherwise, no allocation is performed. This saves some memory
664 * with the trade-off that the source will not be reported to the
665 * router if joined in the window between the query response and
666 * the group actually being joined on the local host.
667 *
668 * VIMAGE: XXX: Currently the mld_sgalloc feature has been removed.
669 * This turns off the allocation of a recorded source entry if
670 * the group has not been joined.
671 *
672 * Return 0 if the source didn't exist or was already marked as recorded.
673 * Return 1 if the source was marked as recorded by this function.
674 * Return <0 if any error occurred (negated errno code).
675 */
676int
677in6m_record_source(struct in6_multi *inm, const struct in6_addr *addr)
678{
679 struct ip6_msource find;
680 struct ip6_msource *ims, *nims;
681
682 IN6_MULTI_LIST_LOCK_ASSERT();
683
684 find.im6s_addr = *addr;
685 ims = RB_FIND(ip6_msource_tree, &inm->in6m_srcs, &find);
686 if (ims && ims->im6s_stp)
687 return (0);
688 if (ims == NULL) {
689 if (inm->in6m_nsrc == in6_mcast_maxgrpsrc)
690 return (-ENOSPC);
691 nims = malloc(sizeof(struct ip6_msource), M_IP6MSOURCE,
692 M_NOWAIT | M_ZERO);
693 if (nims == NULL)
694 return (-ENOMEM);
695 nims->im6s_addr = find.im6s_addr;
696 RB_INSERT(ip6_msource_tree, &inm->in6m_srcs, nims);
697 ++inm->in6m_nsrc;
698 ims = nims;
699 }
700
701 /*
702 * Mark the source as recorded and update the recorded
703 * source count.
704 */
705 ++ims->im6s_stp;
706 ++inm->in6m_st[1].iss_rec;
707
708 return (1);
709}
710
711/*
712 * Return a pointer to an in6_msource owned by an in6_mfilter,
713 * given its source address.
714 * Lazy-allocate if needed. If this is a new entry its filter state is
715 * undefined at t0.
716 *
717 * imf is the filter set being modified.
718 * addr is the source address.
719 *
720 * SMPng: May be called with locks held; malloc must not block.
721 */
722static int
723im6f_get_source(struct in6_mfilter *imf, const struct sockaddr_in6 *psin,
724 struct in6_msource **plims)
725{
726 struct ip6_msource find;
727 struct ip6_msource *ims, *nims;
728 struct in6_msource *lims;
729 int error;
730
731 error = 0;
732 ims = NULL;
733 lims = NULL;
734
735 find.im6s_addr = psin->sin6_addr;
736 ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
737 lims = (struct in6_msource *)ims;
738 if (lims == NULL) {
739 if (imf->im6f_nsrc == in6_mcast_maxsocksrc)
740 return (ENOSPC);
741 nims = malloc(sizeof(struct in6_msource), M_IN6MFILTER,
742 M_NOWAIT | M_ZERO);
743 if (nims == NULL)
744 return (ENOMEM);
745 lims = (struct in6_msource *)nims;
746 lims->im6s_addr = find.im6s_addr;
747 lims->im6sl_st[0] = MCAST_UNDEFINED;
748 RB_INSERT(ip6_msource_tree, &imf->im6f_sources, nims);
749 ++imf->im6f_nsrc;
750 }
751
752 *plims = lims;
753
754 return (error);
755}
756
757/*
758 * Graft a source entry into an existing socket-layer filter set,
759 * maintaining any required invariants and checking allocations.
760 *
761 * The source is marked as being in the new filter mode at t1.
762 *
763 * Return the pointer to the new node, otherwise return NULL.
764 */
765static struct in6_msource *
766im6f_graft(struct in6_mfilter *imf, const uint8_t st1,
767 const struct sockaddr_in6 *psin)
768{
769 struct ip6_msource *nims;
770 struct in6_msource *lims;
771
772 nims = malloc(sizeof(struct in6_msource), M_IN6MFILTER,
773 M_NOWAIT | M_ZERO);
774 if (nims == NULL)
775 return (NULL);
776 lims = (struct in6_msource *)nims;
777 lims->im6s_addr = psin->sin6_addr;
778 lims->im6sl_st[0] = MCAST_UNDEFINED;
779 lims->im6sl_st[1] = st1;
780 RB_INSERT(ip6_msource_tree, &imf->im6f_sources, nims);
781 ++imf->im6f_nsrc;
782
783 return (lims);
784}
785
786/*
787 * Prune a source entry from an existing socket-layer filter set,
788 * maintaining any required invariants and checking allocations.
789 *
790 * The source is marked as being left at t1, it is not freed.
791 *
792 * Return 0 if no error occurred, otherwise return an errno value.
793 */
794static int
795im6f_prune(struct in6_mfilter *imf, const struct sockaddr_in6 *psin)
796{
797 struct ip6_msource find;
798 struct ip6_msource *ims;
799 struct in6_msource *lims;
800
801 find.im6s_addr = psin->sin6_addr;
802 ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
803 if (ims == NULL)
804 return (ENOENT);
805 lims = (struct in6_msource *)ims;
806 lims->im6sl_st[1] = MCAST_UNDEFINED;
807 return (0);
808}
809
810/*
811 * Revert socket-layer filter set deltas at t1 to t0 state.
812 */
813static void
814im6f_rollback(struct in6_mfilter *imf)
815{
816 struct ip6_msource *ims, *tims;
817 struct in6_msource *lims;
818
819 RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
820 lims = (struct in6_msource *)ims;
821 if (lims->im6sl_st[0] == lims->im6sl_st[1]) {
822 /* no change at t1 */
823 continue;
824 } else if (lims->im6sl_st[0] != MCAST_UNDEFINED) {
825 /* revert change to existing source at t1 */
826 lims->im6sl_st[1] = lims->im6sl_st[0];
827 } else {
828 /* revert source added t1 */
829 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
830 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
831 free(ims, M_IN6MFILTER);
832 imf->im6f_nsrc--;
833 }
834 }
835 imf->im6f_st[1] = imf->im6f_st[0];
836}
837
838/*
839 * Mark socket-layer filter set as INCLUDE {} at t1.
840 */
841static void
842im6f_leave(struct in6_mfilter *imf)
843{
844 struct ip6_msource *ims;
845 struct in6_msource *lims;
846
847 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
848 lims = (struct in6_msource *)ims;
849 lims->im6sl_st[1] = MCAST_UNDEFINED;
850 }
851 imf->im6f_st[1] = MCAST_INCLUDE;
852}
853
854/*
855 * Mark socket-layer filter set deltas as committed.
856 */
857static void
858im6f_commit(struct in6_mfilter *imf)
859{
860 struct ip6_msource *ims;
861 struct in6_msource *lims;
862
863 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
864 lims = (struct in6_msource *)ims;
865 lims->im6sl_st[0] = lims->im6sl_st[1];
866 }
867 imf->im6f_st[0] = imf->im6f_st[1];
868}
869
870/*
871 * Reap unreferenced sources from socket-layer filter set.
872 */
873static void
874im6f_reap(struct in6_mfilter *imf)
875{
876 struct ip6_msource *ims, *tims;
877 struct in6_msource *lims;
878
879 RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
880 lims = (struct in6_msource *)ims;
881 if ((lims->im6sl_st[0] == MCAST_UNDEFINED) &&
882 (lims->im6sl_st[1] == MCAST_UNDEFINED)) {
883 CTR2(KTR_MLD, "%s: free lims %p", __func__, ims);
884 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
885 free(ims, M_IN6MFILTER);
886 imf->im6f_nsrc--;
887 }
888 }
889}
890
891/*
892 * Purge socket-layer filter set.
893 */
894static void
895im6f_purge(struct in6_mfilter *imf)
896{
897 struct ip6_msource *ims, *tims;
898
899 RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
900 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
901 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
902 free(ims, M_IN6MFILTER);
903 imf->im6f_nsrc--;
904 }
905 imf->im6f_st[0] = imf->im6f_st[1] = MCAST_UNDEFINED;
906 KASSERT(RB_EMPTY(&imf->im6f_sources),
907 ("%s: im6f_sources not empty", __func__));
908}
909
910/*
911 * Look up a source filter entry for a multicast group.
912 *
913 * inm is the group descriptor to work with.
914 * addr is the IPv6 address to look up.
915 * noalloc may be non-zero to suppress allocation of sources.
916 * *pims will be set to the address of the retrieved or allocated source.
917 *
918 * SMPng: NOTE: may be called with locks held.
919 * Return 0 if successful, otherwise return a non-zero error code.
920 */
921static int
922in6m_get_source(struct in6_multi *inm, const struct in6_addr *addr,
923 const int noalloc, struct ip6_msource **pims)
924{
925 struct ip6_msource find;
926 struct ip6_msource *ims, *nims;
927#ifdef KTR
928 char ip6tbuf[INET6_ADDRSTRLEN];
929#endif
930
931 find.im6s_addr = *addr;
932 ims = RB_FIND(ip6_msource_tree, &inm->in6m_srcs, &find);
933 if (ims == NULL && !noalloc) {
934 if (inm->in6m_nsrc == in6_mcast_maxgrpsrc)
935 return (ENOSPC);
936 nims = malloc(sizeof(struct ip6_msource), M_IP6MSOURCE,
937 M_NOWAIT | M_ZERO);
938 if (nims == NULL)
939 return (ENOMEM);
940 nims->im6s_addr = *addr;
941 RB_INSERT(ip6_msource_tree, &inm->in6m_srcs, nims);
942 ++inm->in6m_nsrc;
943 ims = nims;
944 CTR3(KTR_MLD, "%s: allocated %s as %p", __func__,
945 ip6_sprintf(ip6tbuf, addr), ims);
946 }
947
948 *pims = ims;
949 return (0);
950}
951
952/*
953 * Merge socket-layer source into MLD-layer source.
954 * If rollback is non-zero, perform the inverse of the merge.
955 */
956static void
957im6s_merge(struct ip6_msource *ims, const struct in6_msource *lims,
958 const int rollback)
959{
960 int n = rollback ? -1 : 1;
961#ifdef KTR
962 char ip6tbuf[INET6_ADDRSTRLEN];
963
964 ip6_sprintf(ip6tbuf, &lims->im6s_addr);
965#endif
966
967 if (lims->im6sl_st[0] == MCAST_EXCLUDE) {
968 CTR3(KTR_MLD, "%s: t1 ex -= %d on %s", __func__, n, ip6tbuf);
969 ims->im6s_st[1].ex -= n;
970 } else if (lims->im6sl_st[0] == MCAST_INCLUDE) {
971 CTR3(KTR_MLD, "%s: t1 in -= %d on %s", __func__, n, ip6tbuf);
972 ims->im6s_st[1].in -= n;
973 }
974
975 if (lims->im6sl_st[1] == MCAST_EXCLUDE) {
976 CTR3(KTR_MLD, "%s: t1 ex += %d on %s", __func__, n, ip6tbuf);
977 ims->im6s_st[1].ex += n;
978 } else if (lims->im6sl_st[1] == MCAST_INCLUDE) {
979 CTR3(KTR_MLD, "%s: t1 in += %d on %s", __func__, n, ip6tbuf);
980 ims->im6s_st[1].in += n;
981 }
982}
983
984/*
985 * Atomically update the global in6_multi state, when a membership's
986 * filter list is being updated in any way.
987 *
988 * imf is the per-inpcb-membership group filter pointer.
989 * A fake imf may be passed for in-kernel consumers.
990 *
991 * XXX This is a candidate for a set-symmetric-difference style loop
992 * which would eliminate the repeated lookup from root of ims nodes,
993 * as they share the same key space.
994 *
995 * If any error occurred this function will back out of refcounts
996 * and return a non-zero value.
997 */
998static int
999in6m_merge(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
1000{
1001 struct ip6_msource *ims, *nims;
1002 struct in6_msource *lims;
1003 int schanged, error;
1004 int nsrc0, nsrc1;
1005
1006 schanged = 0;
1007 error = 0;
1008 nsrc1 = nsrc0 = 0;
1009 IN6_MULTI_LIST_LOCK_ASSERT();
1010
1011 /*
1012 * Update the source filters first, as this may fail.
1013 * Maintain count of in-mode filters at t0, t1. These are
1014 * used to work out if we transition into ASM mode or not.
1015 * Maintain a count of source filters whose state was
1016 * actually modified by this operation.
1017 */
1018 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
1019 lims = (struct in6_msource *)ims;
1020 if (lims->im6sl_st[0] == imf->im6f_st[0]) nsrc0++;
1021 if (lims->im6sl_st[1] == imf->im6f_st[1]) nsrc1++;
1022 if (lims->im6sl_st[0] == lims->im6sl_st[1]) continue;
1023 error = in6m_get_source(inm, &lims->im6s_addr, 0, &nims);
1024 ++schanged;
1025 if (error)
1026 break;
1027 im6s_merge(nims, lims, 0);
1028 }
1029 if (error) {
1030 struct ip6_msource *bims;
1031
1032 RB_FOREACH_REVERSE_FROM(ims, ip6_msource_tree, nims) {
1033 lims = (struct in6_msource *)ims;
1034 if (lims->im6sl_st[0] == lims->im6sl_st[1])
1035 continue;
1036 (void)in6m_get_source(inm, &lims->im6s_addr, 1, &bims);
1037 if (bims == NULL)
1038 continue;
1039 im6s_merge(bims, lims, 1);
1040 }
1041 goto out_reap;
1042 }
1043
1044 CTR3(KTR_MLD, "%s: imf filters in-mode: %d at t0, %d at t1",
1045 __func__, nsrc0, nsrc1);
1046
1047 /* Handle transition between INCLUDE {n} and INCLUDE {} on socket. */
1048 if (imf->im6f_st[0] == imf->im6f_st[1] &&
1049 imf->im6f_st[1] == MCAST_INCLUDE) {
1050 if (nsrc1 == 0) {
1051 CTR1(KTR_MLD, "%s: --in on inm at t1", __func__);
1052 --inm->in6m_st[1].iss_in;
1053 }
1054 }
1055
1056 /* Handle filter mode transition on socket. */
1057 if (imf->im6f_st[0] != imf->im6f_st[1]) {
1058 CTR3(KTR_MLD, "%s: imf transition %d to %d",
1059 __func__, imf->im6f_st[0], imf->im6f_st[1]);
1060
1061 if (imf->im6f_st[0] == MCAST_EXCLUDE) {
1062 CTR1(KTR_MLD, "%s: --ex on inm at t1", __func__);
1063 --inm->in6m_st[1].iss_ex;
1064 } else if (imf->im6f_st[0] == MCAST_INCLUDE) {
1065 CTR1(KTR_MLD, "%s: --in on inm at t1", __func__);
1066 --inm->in6m_st[1].iss_in;
1067 }
1068
1069 if (imf->im6f_st[1] == MCAST_EXCLUDE) {
1070 CTR1(KTR_MLD, "%s: ex++ on inm at t1", __func__);
1071 inm->in6m_st[1].iss_ex++;
1072 } else if (imf->im6f_st[1] == MCAST_INCLUDE && nsrc1 > 0) {
1073 CTR1(KTR_MLD, "%s: in++ on inm at t1", __func__);
1074 inm->in6m_st[1].iss_in++;
1075 }
1076 }
1077
1078 /*
1079 * Track inm filter state in terms of listener counts.
1080 * If there are any exclusive listeners, stack-wide
1081 * membership is exclusive.
1082 * Otherwise, if only inclusive listeners, stack-wide is inclusive.
1083 * If no listeners remain, state is undefined at t1,
1084 * and the MLD lifecycle for this group should finish.
1085 */
1086 if (inm->in6m_st[1].iss_ex > 0) {
1087 CTR1(KTR_MLD, "%s: transition to EX", __func__);
1088 inm->in6m_st[1].iss_fmode = MCAST_EXCLUDE;
1089 } else if (inm->in6m_st[1].iss_in > 0) {
1090 CTR1(KTR_MLD, "%s: transition to IN", __func__);
1091 inm->in6m_st[1].iss_fmode = MCAST_INCLUDE;
1092 } else {
1093 CTR1(KTR_MLD, "%s: transition to UNDEF", __func__);
1094 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
1095 }
1096
1097 /* Decrement ASM listener count on transition out of ASM mode. */
1098 if (imf->im6f_st[0] == MCAST_EXCLUDE && nsrc0 == 0) {
1099 if ((imf->im6f_st[1] != MCAST_EXCLUDE) ||
1100 (imf->im6f_st[1] == MCAST_EXCLUDE && nsrc1 > 0)) {
1101 CTR1(KTR_MLD, "%s: --asm on inm at t1", __func__);
1102 --inm->in6m_st[1].iss_asm;
1103 }
1104 }
1105
1106 /* Increment ASM listener count on transition to ASM mode. */
1107 if (imf->im6f_st[1] == MCAST_EXCLUDE && nsrc1 == 0) {
1108 CTR1(KTR_MLD, "%s: asm++ on inm at t1", __func__);
1109 inm->in6m_st[1].iss_asm++;
1110 }
1111
1112 CTR3(KTR_MLD, "%s: merged imf %p to inm %p", __func__, imf, inm);
1113 in6m_print(inm);
1114
1115out_reap:
1116 if (schanged > 0) {
1117 CTR1(KTR_MLD, "%s: sources changed; reaping", __func__);
1118 in6m_reap(inm);
1119 }
1120 return (error);
1121}
1122
1123/*
1124 * Mark an in6_multi's filter set deltas as committed.
1125 * Called by MLD after a state change has been enqueued.
1126 */
1127void
1128in6m_commit(struct in6_multi *inm)
1129{
1130 struct ip6_msource *ims;
1131
1132 CTR2(KTR_MLD, "%s: commit inm %p", __func__, inm);
1133 CTR1(KTR_MLD, "%s: pre commit:", __func__);
1134 in6m_print(inm);
1135
1136 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
1137 ims->im6s_st[0] = ims->im6s_st[1];
1138 }
1139 inm->in6m_st[0] = inm->in6m_st[1];
1140}
1141
1142/*
1143 * Reap unreferenced nodes from an in6_multi's filter set.
1144 */
1145static void
1146in6m_reap(struct in6_multi *inm)
1147{
1148 struct ip6_msource *ims, *tims;
1149
1150 RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs, tims) {
1151 if (ims->im6s_st[0].ex > 0 || ims->im6s_st[0].in > 0 ||
1152 ims->im6s_st[1].ex > 0 || ims->im6s_st[1].in > 0 ||
1153 ims->im6s_stp != 0)
1154 continue;
1155 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
1156 RB_REMOVE(ip6_msource_tree, &inm->in6m_srcs, ims);
1157 free(ims, M_IP6MSOURCE);
1158 inm->in6m_nsrc--;
1159 }
1160}
1161
1162/*
1163 * Purge all source nodes from an in6_multi's filter set.
1164 */
1165static void
1166in6m_purge(struct in6_multi *inm)
1167{
1168 struct ip6_msource *ims, *tims;
1169
1170 RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs, tims) {
1171 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
1172 RB_REMOVE(ip6_msource_tree, &inm->in6m_srcs, ims);
1173 free(ims, M_IP6MSOURCE);
1174 inm->in6m_nsrc--;
1175 }
1176 /* Free state-change requests that might be queued. */
1177 mbufq_drain(&inm->in6m_scq);
1178}
1179
1180/*
1181 * Join a multicast address w/o sources.
1182 * KAME compatibility entry point.
1183 *
1184 * SMPng: Assume no mc locks held by caller.
1185 */
1186int
1187in6_joingroup(struct ifnet *ifp, const struct in6_addr *mcaddr,
1188 /*const*/ struct in6_mfilter *imf, struct in6_multi **pinm,
1189 const int delay)
1190{
1191 int error;
1192
1193 IN6_MULTI_LOCK();
1194 error = in6_joingroup_locked(ifp, mcaddr, NULL, pinm, delay);
1195 IN6_MULTI_UNLOCK();
1196 return (error);
1197}
1198
1199/*
1200 * Join a multicast group; real entry point.
1201 *
1202 * Only preserves atomicity at inm level.
1203 * NOTE: imf argument cannot be const due to sys/tree.h limitations.
1204 *
1205 * If the MLD downcall fails, the group is not joined, and an error
1206 * code is returned.
1207 */
1208static int
1209in6_joingroup_locked(struct ifnet *ifp, const struct in6_addr *mcaddr,
1210 /*const*/ struct in6_mfilter *imf, struct in6_multi **pinm,
1211 const int delay)
1212{
1213 struct in6_multi_head inmh;
1214 struct in6_mfilter timf;
1215 struct in6_multi *inm;
1216 struct ifmultiaddr *ifma;
1217 int error;
1218#ifdef KTR
1219 char ip6tbuf[INET6_ADDRSTRLEN];
1220#endif
1221
1222 /*
1223 * Sanity: Check scope zone ID was set for ifp, if and
1224 * only if group is scoped to an interface.
1225 */
1226 KASSERT(IN6_IS_ADDR_MULTICAST(mcaddr),
1227 ("%s: not a multicast address", __func__));
1228 if (IN6_IS_ADDR_MC_LINKLOCAL(mcaddr) ||
1229 IN6_IS_ADDR_MC_INTFACELOCAL(mcaddr)) {
1230 KASSERT(mcaddr->s6_addr16[1] != 0,
1231 ("%s: scope zone ID not set", __func__));
1232 }
1233
1234 IN6_MULTI_LOCK_ASSERT();
1235 IN6_MULTI_LIST_UNLOCK_ASSERT();
1236
1237 CTR4(KTR_MLD, "%s: join %s on %p(%s))", __func__,
1238 ip6_sprintf(ip6tbuf, mcaddr), ifp, if_name(ifp));
1239
1240 error = 0;
1241 inm = NULL;
1242
1243 /*
1244 * If no imf was specified (i.e. kernel consumer),
1245 * fake one up and assume it is an ASM join.
1246 */
1247 if (imf == NULL) {
1248 im6f_init(&timf, MCAST_UNDEFINED, MCAST_EXCLUDE);
1249 imf = &timf;
1250 }
1251 error = in6_getmulti(ifp, mcaddr, &inm);
1252 if (error) {
1253 CTR1(KTR_MLD, "%s: in6_getmulti() failure", __func__);
1254 return (error);
1255 }
1256
1257 IN6_MULTI_LIST_LOCK();
1258 CTR1(KTR_MLD, "%s: merge inm state", __func__);
1259 error = in6m_merge(inm, imf);
1260 if (error) {
1261 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
1262 goto out_in6m_release;
1263 }
1264
1265 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
1266 error = mld_change_state(inm, delay);
1267 if (error) {
1268 CTR1(KTR_MLD, "%s: failed to update source", __func__);
1269 goto out_in6m_release;
1270 }
1271
1272out_in6m_release:
1273 SLIST_INIT(&inmh);
1274 if (error) {
1275 struct epoch_tracker et;
1276
1277 CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
1278 IF_ADDR_WLOCK(ifp);
1279 NET_EPOCH_ENTER(et);
1280 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1281 if (ifma->ifma_protospec == inm) {
1282 ifma->ifma_protospec = NULL;
1283 break;
1284 }
1285 }
1286 in6m_disconnect_locked(&inmh, inm);
1287 in6m_rele_locked(&inmh, inm);
1288 NET_EPOCH_EXIT(et);
1289 IF_ADDR_WUNLOCK(ifp);
1290 } else {
1291 *pinm = inm;
1292 }
1293 IN6_MULTI_LIST_UNLOCK();
1294 in6m_release_list_deferred(&inmh);
1295 return (error);
1296}
1297
1298/*
1299 * Leave a multicast group; unlocked entry point.
1300 */
1301int
1302in6_leavegroup(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
1303{
1304 int error;
1305
1306 IN6_MULTI_LOCK();
1307 error = in6_leavegroup_locked(inm, imf);
1308 IN6_MULTI_UNLOCK();
1309 return (error);
1310}
1311
1312/*
1313 * Leave a multicast group; real entry point.
1314 * All source filters will be expunged.
1315 *
1316 * Only preserves atomicity at inm level.
1317 *
1318 * Holding the write lock for the INP which contains imf
1319 * is highly advisable. We can't assert for it as imf does not
1320 * contain a back-pointer to the owning inp.
1321 *
1322 * Note: This is not the same as in6m_release(*) as this function also
1323 * makes a state change downcall into MLD.
1324 */
1325int
1326in6_leavegroup_locked(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
1327{
1328 struct in6_multi_head inmh;
1329 struct in6_mfilter timf;
1330 struct ifnet *ifp;
1331 int error;
1332#ifdef KTR
1333 char ip6tbuf[INET6_ADDRSTRLEN];
1334#endif
1335
1336 error = 0;
1337
1338 IN6_MULTI_LOCK_ASSERT();
1339
1340 CTR5(KTR_MLD, "%s: leave inm %p, %s/%s, imf %p", __func__,
1341 inm, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
1342 (in6m_is_ifp_detached(inm) ? "null" : if_name(inm->in6m_ifp)),
1343 imf);
1344
1345 /*
1346 * If no imf was specified (i.e. kernel consumer),
1347 * fake one up and assume it is an ASM join.
1348 */
1349 if (imf == NULL) {
1350 im6f_init(&timf, MCAST_EXCLUDE, MCAST_UNDEFINED);
1351 imf = &timf;
1352 }
1353
1354 /*
1355 * Begin state merge transaction at MLD layer.
1356 *
1357 * As this particular invocation should not cause any memory
1358 * to be allocated, and there is no opportunity to roll back
1359 * the transaction, it MUST NOT fail.
1360 */
1361
1362 ifp = inm->in6m_ifp;
1363 IN6_MULTI_LIST_LOCK();
1364 CTR1(KTR_MLD, "%s: merge inm state", __func__);
1365 error = in6m_merge(inm, imf);
1366 KASSERT(error == 0, ("%s: failed to merge inm state", __func__));
1367
1368 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
1369 error = 0;
1370 if (ifp)
1371 error = mld_change_state(inm, 0);
1372 if (error)
1373 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
1374
1375 CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
1376 if (ifp)
1377 IF_ADDR_WLOCK(ifp);
1378
1379 SLIST_INIT(&inmh);
1380 if (inm->in6m_refcount == 1)
1381 in6m_disconnect_locked(&inmh, inm);
1382 in6m_rele_locked(&inmh, inm);
1383 if (ifp)
1384 IF_ADDR_WUNLOCK(ifp);
1385 IN6_MULTI_LIST_UNLOCK();
1386 in6m_release_list_deferred(&inmh);
1387 return (error);
1388}
1389
1390/*
1391 * Block or unblock an ASM multicast source on an inpcb.
1392 * This implements the delta-based API described in RFC 3678.
1393 *
1394 * The delta-based API applies only to exclusive-mode memberships.
1395 * An MLD downcall will be performed.
1396 *
1397 * SMPng: NOTE: Must take Giant as a join may create a new ifma.
1398 *
1399 * Return 0 if successful, otherwise return an appropriate error code.
1400 */
1401static int
1402in6p_block_unblock_source(struct inpcb *inp, struct sockopt *sopt)
1403{
1404 struct group_source_req gsr;
1405 struct epoch_tracker et;
1406 sockunion_t *gsa, *ssa;
1407 struct ifnet *ifp;
1408 struct in6_mfilter *imf;
1409 struct ip6_moptions *imo;
1410 struct in6_msource *ims;
1411 struct in6_multi *inm;
1412 uint16_t fmode;
1413 int error, doblock;
1414#ifdef KTR
1415 char ip6tbuf[INET6_ADDRSTRLEN];
1416#endif
1417
1418 ifp = NULL;
1419 error = 0;
1420 doblock = 0;
1421
1422 memset(&gsr, 0, sizeof(struct group_source_req));
1423 gsa = (sockunion_t *)&gsr.gsr_group;
1424 ssa = (sockunion_t *)&gsr.gsr_source;
1425
1426 switch (sopt->sopt_name) {
1427 case MCAST_BLOCK_SOURCE:
1428 case MCAST_UNBLOCK_SOURCE:
1429 error = sooptcopyin(sopt, &gsr,
1430 sizeof(struct group_source_req),
1431 sizeof(struct group_source_req));
1432 if (error)
1433 return (error);
1434
1435 if (gsa->sin6.sin6_family != AF_INET6 ||
1436 gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1437 return (EINVAL);
1438
1439 if (ssa->sin6.sin6_family != AF_INET6 ||
1440 ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1441 return (EINVAL);
1442
1443 /*
1444 * XXXGL: this function should use ifnet_byindex_ref, or
1445 * expand the epoch section all the way to where we put
1446 * the reference.
1447 */
1448 NET_EPOCH_ENTER(et);
1449 ifp = ifnet_byindex(gsr.gsr_interface);
1450 NET_EPOCH_EXIT(et);
1451 if (ifp == NULL)
1452 return (EADDRNOTAVAIL);
1453
1454 if (sopt->sopt_name == MCAST_BLOCK_SOURCE)
1455 doblock = 1;
1456 break;
1457
1458 default:
1459 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
1460 __func__, sopt->sopt_name);
1461 return (EOPNOTSUPP);
1462 break;
1463 }
1464
1465 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
1466 return (EINVAL);
1467
1468 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
1469
1470 /*
1471 * Check if we are actually a member of this group.
1472 */
1473 imo = in6p_findmoptions(inp);
1474 imf = im6o_match_group(imo, ifp, &gsa->sa);
1475 if (imf == NULL) {
1476 error = EADDRNOTAVAIL;
1477 goto out_in6p_locked;
1478 }
1479 inm = imf->im6f_in6m;
1480
1481 /*
1482 * Attempting to use the delta-based API on an
1483 * non exclusive-mode membership is an error.
1484 */
1485 fmode = imf->im6f_st[0];
1486 if (fmode != MCAST_EXCLUDE) {
1487 error = EINVAL;
1488 goto out_in6p_locked;
1489 }
1490
1491 /*
1492 * Deal with error cases up-front:
1493 * Asked to block, but already blocked; or
1494 * Asked to unblock, but nothing to unblock.
1495 * If adding a new block entry, allocate it.
1496 */
1497 ims = im6o_match_source(imf, &ssa->sa);
1498 if ((ims != NULL && doblock) || (ims == NULL && !doblock)) {
1499 CTR3(KTR_MLD, "%s: source %s %spresent", __func__,
1500 ip6_sprintf(ip6tbuf, &ssa->sin6.sin6_addr),
1501 doblock ? "" : "not ");
1502 error = EADDRNOTAVAIL;
1503 goto out_in6p_locked;
1504 }
1505
1506 INP_WLOCK_ASSERT(inp);
1507
1508 /*
1509 * Begin state merge transaction at socket layer.
1510 */
1511 if (doblock) {
1512 CTR2(KTR_MLD, "%s: %s source", __func__, "block");
1513 ims = im6f_graft(imf, fmode, &ssa->sin6);
1514 if (ims == NULL)
1515 error = ENOMEM;
1516 } else {
1517 CTR2(KTR_MLD, "%s: %s source", __func__, "allow");
1518 error = im6f_prune(imf, &ssa->sin6);
1519 }
1520
1521 if (error) {
1522 CTR1(KTR_MLD, "%s: merge imf state failed", __func__);
1523 goto out_im6f_rollback;
1524 }
1525
1526 /*
1527 * Begin state merge transaction at MLD layer.
1528 */
1529 IN6_MULTI_LIST_LOCK();
1530 CTR1(KTR_MLD, "%s: merge inm state", __func__);
1531 error = in6m_merge(inm, imf);
1532 if (error)
1533 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
1534 else {
1535 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
1536 error = mld_change_state(inm, 0);
1537 if (error)
1538 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
1539 }
1540
1541 IN6_MULTI_LIST_UNLOCK();
1542
1543out_im6f_rollback:
1544 if (error)
1545 im6f_rollback(imf);
1546 else
1547 im6f_commit(imf);
1548
1549 im6f_reap(imf);
1550
1551out_in6p_locked:
1552 INP_WUNLOCK(inp);
1553 return (error);
1554}
1555
1556/*
1557 * Given an inpcb, return its multicast options structure pointer. Accepts
1558 * an unlocked inpcb pointer, but will return it locked. May sleep.
1559 *
1560 * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
1561 * SMPng: NOTE: Returns with the INP write lock held.
1562 */
1563static struct ip6_moptions *
1564in6p_findmoptions(struct inpcb *inp)
1565{
1566 struct ip6_moptions *imo;
1567
1568 INP_WLOCK(inp);
1569 if (inp->in6p_moptions != NULL)
1570 return (inp->in6p_moptions);
1571
1572 INP_WUNLOCK(inp);
1573
1574 imo = malloc(sizeof(*imo), M_IP6MOPTS, M_WAITOK);
1575
1576 imo->im6o_multicast_ifp = NULL;
1577 imo->im6o_multicast_hlim = V_ip6_defmcasthlim;
1578 imo->im6o_multicast_loop = in6_mcast_loop;
1579 STAILQ_INIT(&imo->im6o_head);
1580
1581 INP_WLOCK(inp);
1582 if (inp->in6p_moptions != NULL) {
1583 free(imo, M_IP6MOPTS);
1584 return (inp->in6p_moptions);
1585 }
1586 inp->in6p_moptions = imo;
1587 return (imo);
1588}
1589
1590/*
1591 * Discard the IPv6 multicast options (and source filters).
1592 *
1593 * SMPng: NOTE: assumes INP write lock is held.
1594 *
1595 * XXX can all be safely deferred to epoch_call
1596 *
1597 */
1598
1599static void
1600inp_gcmoptions(struct ip6_moptions *imo)
1601{
1602 struct in6_mfilter *imf;
1603 struct in6_multi *inm;
1604 struct ifnet *ifp;
1605
1606 while ((imf = ip6_mfilter_first(&imo->im6o_head)) != NULL) {
1607 ip6_mfilter_remove(&imo->im6o_head, imf);
1608
1609 im6f_leave(imf);
1610 if ((inm = imf->im6f_in6m) != NULL) {
1611 if ((ifp = inm->in6m_ifp) != NULL) {
1612 CURVNET_SET(ifp->if_vnet);
1613 (void)in6_leavegroup(inm, imf);
1614 CURVNET_RESTORE();
1615 } else {
1616 (void)in6_leavegroup(inm, imf);
1617 }
1618 }
1619 ip6_mfilter_free(imf);
1620 }
1621 free(imo, M_IP6MOPTS);
1622}
1623
1624void
1625ip6_freemoptions(struct ip6_moptions *imo)
1626{
1627 if (imo == NULL)
1628 return;
1629 inp_gcmoptions(imo);
1630}
1631
1632/*
1633 * Atomically get source filters on a socket for an IPv6 multicast group.
1634 * Called with INP lock held; returns with lock released.
1635 */
1636static int
1637in6p_get_source_filters(struct inpcb *inp, struct sockopt *sopt)
1638{
1639 struct epoch_tracker et;
1640 struct __msfilterreq msfr;
1641 sockunion_t *gsa;
1642 struct ifnet *ifp;
1643 struct ip6_moptions *imo;
1644 struct in6_mfilter *imf;
1645 struct ip6_msource *ims;
1646 struct in6_msource *lims;
1647 struct sockaddr_in6 *psin;
1648 struct sockaddr_storage *ptss;
1649 struct sockaddr_storage *tss;
1650 int error;
1651 size_t nsrcs, ncsrcs;
1652
1653 INP_WLOCK_ASSERT(inp);
1654
1655 imo = inp->in6p_moptions;
1656 KASSERT(imo != NULL, ("%s: null ip6_moptions", __func__));
1657
1658 INP_WUNLOCK(inp);
1659
1660 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
1661 sizeof(struct __msfilterreq));
1662 if (error)
1663 return (error);
1664
1665 if (msfr.msfr_group.ss_family != AF_INET6 ||
1666 msfr.msfr_group.ss_len != sizeof(struct sockaddr_in6))
1667 return (EINVAL);
1668
1669 gsa = (sockunion_t *)&msfr.msfr_group;
1670 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
1671 return (EINVAL);
1672
1673 /*
1674 * XXXGL: this function should use ifnet_byindex_ref, or expand the
1675 * epoch section all the way to where the interface is referenced.
1676 */
1677 NET_EPOCH_ENTER(et);
1678 ifp = ifnet_byindex(msfr.msfr_ifindex);
1679 NET_EPOCH_EXIT(et);
1680 if (ifp == NULL)
1681 return (EADDRNOTAVAIL);
1682 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
1683
1684 INP_WLOCK(inp);
1685
1686 /*
1687 * Lookup group on the socket.
1688 */
1689 imf = im6o_match_group(imo, ifp, &gsa->sa);
1690 if (imf == NULL) {
1691 INP_WUNLOCK(inp);
1692 return (EADDRNOTAVAIL);
1693 }
1694
1695 /*
1696 * Ignore memberships which are in limbo.
1697 */
1698 if (imf->im6f_st[1] == MCAST_UNDEFINED) {
1699 INP_WUNLOCK(inp);
1700 return (EAGAIN);
1701 }
1702 msfr.msfr_fmode = imf->im6f_st[1];
1703
1704 /*
1705 * If the user specified a buffer, copy out the source filter
1706 * entries to userland gracefully.
1707 * We only copy out the number of entries which userland
1708 * has asked for, but we always tell userland how big the
1709 * buffer really needs to be.
1710 */
1711 if (msfr.msfr_nsrcs > in6_mcast_maxsocksrc)
1712 msfr.msfr_nsrcs = in6_mcast_maxsocksrc;
1713 tss = NULL;
1714 if (msfr.msfr_srcs != NULL && msfr.msfr_nsrcs > 0) {
1715 tss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
1716 M_TEMP, M_NOWAIT | M_ZERO);
1717 if (tss == NULL) {
1718 INP_WUNLOCK(inp);
1719 return (ENOBUFS);
1720 }
1721 }
1722
1723 /*
1724 * Count number of sources in-mode at t0.
1725 * If buffer space exists and remains, copy out source entries.
1726 */
1727 nsrcs = msfr.msfr_nsrcs;
1728 ncsrcs = 0;
1729 ptss = tss;
1730 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
1731 lims = (struct in6_msource *)ims;
1732 if (lims->im6sl_st[0] == MCAST_UNDEFINED ||
1733 lims->im6sl_st[0] != imf->im6f_st[0])
1734 continue;
1735 ++ncsrcs;
1736 if (tss != NULL && nsrcs > 0) {
1737 psin = (struct sockaddr_in6 *)ptss;
1738 psin->sin6_family = AF_INET6;
1739 psin->sin6_len = sizeof(struct sockaddr_in6);
1740 psin->sin6_addr = lims->im6s_addr;
1741 psin->sin6_port = 0;
1742 --nsrcs;
1743 ++ptss;
1744 }
1745 }
1746
1747 INP_WUNLOCK(inp);
1748
1749 if (tss != NULL) {
1750 error = copyout(tss, msfr.msfr_srcs,
1751 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
1752 free(tss, M_TEMP);
1753 if (error)
1754 return (error);
1755 }
1756
1757 msfr.msfr_nsrcs = ncsrcs;
1758 error = sooptcopyout(sopt, &msfr, sizeof(struct __msfilterreq));
1759
1760 return (error);
1761}
1762
1763/*
1764 * Return the IP multicast options in response to user getsockopt().
1765 */
1766int
1767ip6_getmoptions(struct inpcb *inp, struct sockopt *sopt)
1768{
1769 struct ip6_moptions *im6o;
1770 int error;
1771 u_int optval;
1772
1773 INP_WLOCK(inp);
1774 im6o = inp->in6p_moptions;
1775 /*
1776 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
1777 * or is a divert socket, reject it.
1778 */
1779 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
1780 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
1781 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM)) {
1782 INP_WUNLOCK(inp);
1783 return (EOPNOTSUPP);
1784 }
1785
1786 error = 0;
1787 switch (sopt->sopt_name) {
1788 case IPV6_MULTICAST_IF:
1789 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) {
1790 optval = 0;
1791 } else {
1792 optval = im6o->im6o_multicast_ifp->if_index;
1793 }
1794 INP_WUNLOCK(inp);
1795 error = sooptcopyout(sopt, &optval, sizeof(u_int));
1796 break;
1797
1798 case IPV6_MULTICAST_HOPS:
1799 if (im6o == NULL)
1800 optval = V_ip6_defmcasthlim;
1801 else
1802 optval = im6o->im6o_multicast_hlim;
1803 INP_WUNLOCK(inp);
1804 error = sooptcopyout(sopt, &optval, sizeof(u_int));
1805 break;
1806
1807 case IPV6_MULTICAST_LOOP:
1808 if (im6o == NULL)
1809 optval = in6_mcast_loop; /* XXX VIMAGE */
1810 else
1811 optval = im6o->im6o_multicast_loop;
1812 INP_WUNLOCK(inp);
1813 error = sooptcopyout(sopt, &optval, sizeof(u_int));
1814 break;
1815
1816 case IPV6_MSFILTER:
1817 if (im6o == NULL) {
1818 error = EADDRNOTAVAIL;
1819 INP_WUNLOCK(inp);
1820 } else {
1821 error = in6p_get_source_filters(inp, sopt);
1822 }
1823 break;
1824
1825 default:
1826 INP_WUNLOCK(inp);
1827 error = ENOPROTOOPT;
1828 break;
1829 }
1830
1831 INP_UNLOCK_ASSERT(inp);
1832
1833 return (error);
1834}
1835
1836/*
1837 * Look up the ifnet to use for a multicast group membership,
1838 * given the address of an IPv6 group.
1839 *
1840 * This routine exists to support legacy IPv6 multicast applications.
1841 *
1842 * Use the socket's current FIB number for any required FIB lookup. Look up the
1843 * group address in the unicast FIB, and use its ifp; usually, this points to
1844 * the default next-hop. If the FIB lookup fails, return NULL.
1845 *
1846 * FUTURE: Support multiple forwarding tables for IPv6.
1847 *
1848 * Returns NULL if no ifp could be found.
1849 */
1850static struct ifnet *
1851in6p_lookup_mcast_ifp(const struct inpcb *inp, const struct sockaddr_in6 *gsin6)
1852{
1853 struct nhop_object *nh;
1854 struct in6_addr dst;
1855 uint32_t scopeid;
1856 uint32_t fibnum;
1857
1858 KASSERT(gsin6->sin6_family == AF_INET6,
1859 ("%s: not AF_INET6 group", __func__));
1860
1861 in6_splitscope(&gsin6->sin6_addr, &dst, &scopeid);
1862 fibnum = inp->inp_inc.inc_fibnum;
1863 nh = fib6_lookup(fibnum, &dst, scopeid, 0, 0);
1864
1865 return (nh ? nh->nh_ifp : NULL);
1866}
1867
1868/*
1869 * Join an IPv6 multicast group, possibly with a source.
1870 *
1871 * FIXME: The KAME use of the unspecified address (::)
1872 * to join *all* multicast groups is currently unsupported.
1873 *
1874 * XXXGL: this function multiple times uses ifnet_byindex() without
1875 * proper protection - staying in epoch, or putting reference on ifnet.
1876 */
1877static int
1878in6p_join_group(struct inpcb *inp, struct sockopt *sopt)
1879{
1880 struct in6_multi_head inmh;
1881 struct group_source_req gsr;
1882 struct epoch_tracker et;
1883 sockunion_t *gsa, *ssa;
1884 struct ifnet *ifp;
1885 struct in6_mfilter *imf;
1886 struct ip6_moptions *imo;
1887 struct in6_multi *inm;
1888 struct in6_msource *lims;
1889 int error, is_new;
1890
1891 SLIST_INIT(&inmh);
1892 ifp = NULL;
1893 lims = NULL;
1894 error = 0;
1895
1896 memset(&gsr, 0, sizeof(struct group_source_req));
1897 gsa = (sockunion_t *)&gsr.gsr_group;
1898 gsa->ss.ss_family = AF_UNSPEC;
1899 ssa = (sockunion_t *)&gsr.gsr_source;
1900 ssa->ss.ss_family = AF_UNSPEC;
1901
1902 /*
1903 * Chew everything into struct group_source_req.
1904 * Overwrite the port field if present, as the sockaddr
1905 * being copied in may be matched with a binary comparison.
1906 * Ignore passed-in scope ID.
1907 */
1908 switch (sopt->sopt_name) {
1909 case IPV6_JOIN_GROUP: {
1910 struct ipv6_mreq mreq;
1911
1912 error = sooptcopyin(sopt, &mreq, sizeof(struct ipv6_mreq),
1913 sizeof(struct ipv6_mreq));
1914 if (error)
1915 return (error);
1916
1917 gsa->sin6.sin6_family = AF_INET6;
1918 gsa->sin6.sin6_len = sizeof(struct sockaddr_in6);
1919 gsa->sin6.sin6_addr = mreq.ipv6mr_multiaddr;
1920
1921 if (mreq.ipv6mr_interface == 0) {
1922 ifp = in6p_lookup_mcast_ifp(inp, &gsa->sin6);
1923 } else {
1924 NET_EPOCH_ENTER(et);
1925 ifp = ifnet_byindex(mreq.ipv6mr_interface);
1926 NET_EPOCH_EXIT(et);
1927 if (ifp == NULL)
1928 return (EADDRNOTAVAIL);
1929 }
1930 CTR3(KTR_MLD, "%s: ipv6mr_interface = %d, ifp = %p",
1931 __func__, mreq.ipv6mr_interface, ifp);
1932 } break;
1933
1934 case MCAST_JOIN_GROUP:
1935 case MCAST_JOIN_SOURCE_GROUP:
1936 if (sopt->sopt_name == MCAST_JOIN_GROUP) {
1937 error = sooptcopyin(sopt, &gsr,
1938 sizeof(struct group_req),
1939 sizeof(struct group_req));
1940 } else if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1941 error = sooptcopyin(sopt, &gsr,
1942 sizeof(struct group_source_req),
1943 sizeof(struct group_source_req));
1944 }
1945 if (error)
1946 return (error);
1947
1948 if (gsa->sin6.sin6_family != AF_INET6 ||
1949 gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1950 return (EINVAL);
1951
1952 if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1953 if (ssa->sin6.sin6_family != AF_INET6 ||
1954 ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1955 return (EINVAL);
1956 if (IN6_IS_ADDR_MULTICAST(&ssa->sin6.sin6_addr))
1957 return (EINVAL);
1958 /*
1959 * TODO: Validate embedded scope ID in source
1960 * list entry against passed-in ifp, if and only
1961 * if source list filter entry is iface or node local.
1962 */
1963 in6_clearscope(&ssa->sin6.sin6_addr);
1964 ssa->sin6.sin6_port = 0;
1965 ssa->sin6.sin6_scope_id = 0;
1966 }
1967 NET_EPOCH_ENTER(et);
1968 ifp = ifnet_byindex(gsr.gsr_interface);
1969 NET_EPOCH_EXIT(et);
1970 if (ifp == NULL)
1971 return (EADDRNOTAVAIL);
1972 break;
1973
1974 default:
1975 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
1976 __func__, sopt->sopt_name);
1977 return (EOPNOTSUPP);
1978 break;
1979 }
1980
1981 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
1982 return (EINVAL);
1983
1984 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0)
1985 return (EADDRNOTAVAIL);
1986
1987 gsa->sin6.sin6_port = 0;
1988 gsa->sin6.sin6_scope_id = 0;
1989
1990 /*
1991 * Always set the scope zone ID on memberships created from userland.
1992 * Use the passed-in ifp to do this.
1993 * XXX The in6_setscope() return value is meaningless.
1994 * XXX SCOPE6_LOCK() is taken by in6_setscope().
1995 */
1996 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
1997
1998 IN6_MULTI_LOCK();
1999
2000 /*
2001 * Find the membership in the membership list.
2002 */
2003 imo = in6p_findmoptions(inp);
2004 imf = im6o_match_group(imo, ifp, &gsa->sa);
2005 if (imf == NULL) {
2006 is_new = 1;
2007 inm = NULL;
2008
2009 if (ip6_mfilter_count(&imo->im6o_head) >= IPV6_MAX_MEMBERSHIPS) {
2010 error = ENOMEM;
2011 goto out_in6p_locked;
2012 }
2013 } else {
2014 is_new = 0;
2015 inm = imf->im6f_in6m;
2016
2017 if (ssa->ss.ss_family != AF_UNSPEC) {
2018 /*
2019 * MCAST_JOIN_SOURCE_GROUP on an exclusive membership
2020 * is an error. On an existing inclusive membership,
2021 * it just adds the source to the filter list.
2022 */
2023 if (imf->im6f_st[1] != MCAST_INCLUDE) {
2024 error = EINVAL;
2025 goto out_in6p_locked;
2026 }
2027 /*
2028 * Throw out duplicates.
2029 *
2030 * XXX FIXME: This makes a naive assumption that
2031 * even if entries exist for *ssa in this imf,
2032 * they will be rejected as dupes, even if they
2033 * are not valid in the current mode (in-mode).
2034 *
2035 * in6_msource is transactioned just as for anything
2036 * else in SSM -- but note naive use of in6m_graft()
2037 * below for allocating new filter entries.
2038 *
2039 * This is only an issue if someone mixes the
2040 * full-state SSM API with the delta-based API,
2041 * which is discouraged in the relevant RFCs.
2042 */
2043 lims = im6o_match_source(imf, &ssa->sa);
2044 if (lims != NULL /*&&
2045 lims->im6sl_st[1] == MCAST_INCLUDE*/) {
2046 error = EADDRNOTAVAIL;
2047 goto out_in6p_locked;
2048 }
2049 } else {
2050 /*
2051 * MCAST_JOIN_GROUP alone, on any existing membership,
2052 * is rejected, to stop the same inpcb tying up
2053 * multiple refs to the in_multi.
2054 * On an existing inclusive membership, this is also
2055 * an error; if you want to change filter mode,
2056 * you must use the userland API setsourcefilter().
2057 * XXX We don't reject this for imf in UNDEFINED
2058 * state at t1, because allocation of a filter
2059 * is atomic with allocation of a membership.
2060 */
2061 error = EADDRINUSE;
2062 goto out_in6p_locked;
2063 }
2064 }
2065
2066 /*
2067 * Begin state merge transaction at socket layer.
2068 */
2069 INP_WLOCK_ASSERT(inp);
2070
2071 /*
2072 * Graft new source into filter list for this inpcb's
2073 * membership of the group. The in6_multi may not have
2074 * been allocated yet if this is a new membership, however,
2075 * the in_mfilter slot will be allocated and must be initialized.
2076 *
2077 * Note: Grafting of exclusive mode filters doesn't happen
2078 * in this path.
2079 * XXX: Should check for non-NULL lims (node exists but may
2080 * not be in-mode) for interop with full-state API.
2081 */
2082 if (ssa->ss.ss_family != AF_UNSPEC) {
2083 /* Membership starts in IN mode */
2084 if (is_new) {
2085 CTR1(KTR_MLD, "%s: new join w/source", __func__);
2086 imf = ip6_mfilter_alloc(M_NOWAIT, MCAST_UNDEFINED, MCAST_INCLUDE);
2087 if (imf == NULL) {
2088 error = ENOMEM;
2089 goto out_in6p_locked;
2090 }
2091 } else {
2092 CTR2(KTR_MLD, "%s: %s source", __func__, "allow");
2093 }
2094 lims = im6f_graft(imf, MCAST_INCLUDE, &ssa->sin6);
2095 if (lims == NULL) {
2096 CTR1(KTR_MLD, "%s: merge imf state failed",
2097 __func__);
2098 error = ENOMEM;
2099 goto out_in6p_locked;
2100 }
2101 } else {
2102 /* No address specified; Membership starts in EX mode */
2103 if (is_new) {
2104 CTR1(KTR_MLD, "%s: new join w/o source", __func__);
2105 imf = ip6_mfilter_alloc(M_NOWAIT, MCAST_UNDEFINED, MCAST_EXCLUDE);
2106 if (imf == NULL) {
2107 error = ENOMEM;
2108 goto out_in6p_locked;
2109 }
2110 }
2111 }
2112
2113 /*
2114 * Begin state merge transaction at MLD layer.
2115 */
2116 if (is_new) {
2117 in_pcbref(inp);
2118 INP_WUNLOCK(inp);
2119
2120 error = in6_joingroup_locked(ifp, &gsa->sin6.sin6_addr, imf,
2121 &imf->im6f_in6m, 0);
2122
2123 INP_WLOCK(inp);
2124 if (in_pcbrele_wlocked(inp)) {
2125 error = ENXIO;
2126 goto out_in6p_unlocked;
2127 }
2128 if (error) {
2129 goto out_in6p_locked;
2130 }
2131 /*
2132 * NOTE: Refcount from in6_joingroup_locked()
2133 * is protecting membership.
2134 */
2135 ip6_mfilter_insert(&imo->im6o_head, imf);
2136 } else {
2137 CTR1(KTR_MLD, "%s: merge inm state", __func__);
2138 IN6_MULTI_LIST_LOCK();
2139 error = in6m_merge(inm, imf);
2140 if (error) {
2141 CTR1(KTR_MLD, "%s: failed to merge inm state",
2142 __func__);
2143 IN6_MULTI_LIST_UNLOCK();
2144 im6f_rollback(imf);
2145 im6f_reap(imf);
2146 goto out_in6p_locked;
2147 }
2148 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
2149 error = mld_change_state(inm, 0);
2150 IN6_MULTI_LIST_UNLOCK();
2151
2152 if (error) {
2153 CTR1(KTR_MLD, "%s: failed mld downcall",
2154 __func__);
2155 im6f_rollback(imf);
2156 im6f_reap(imf);
2157 goto out_in6p_locked;
2158 }
2159 }
2160
2161 im6f_commit(imf);
2162 imf = NULL;
2163
2164out_in6p_locked:
2165 INP_WUNLOCK(inp);
2166out_in6p_unlocked:
2167 IN6_MULTI_UNLOCK();
2168
2169 if (is_new && imf) {
2170 if (imf->im6f_in6m != NULL) {
2171 struct in6_multi_head inmh;
2172
2173 SLIST_INIT(&inmh);
2174 SLIST_INSERT_HEAD(&inmh, imf->im6f_in6m, in6m_defer);
2175 in6m_release_list_deferred(&inmh);
2176 }
2177 ip6_mfilter_free(imf);
2178 }
2179 return (error);
2180}
2181
2182/*
2183 * Leave an IPv6 multicast group on an inpcb, possibly with a source.
2184 */
2185static int
2186in6p_leave_group(struct inpcb *inp, struct sockopt *sopt)
2187{
2188 struct ipv6_mreq mreq;
2189 struct group_source_req gsr;
2190 struct epoch_tracker et;
2191 sockunion_t *gsa, *ssa;
2192 struct ifnet *ifp;
2193 struct in6_mfilter *imf;
2194 struct ip6_moptions *imo;
2195 struct in6_msource *ims;
2196 struct in6_multi *inm;
2197 uint32_t ifindex;
2198 int error;
2199 bool is_final;
2200#ifdef KTR
2201 char ip6tbuf[INET6_ADDRSTRLEN];
2202#endif
2203
2204 ifp = NULL;
2205 ifindex = 0;
2206 error = 0;
2207 is_final = true;
2208
2209 memset(&gsr, 0, sizeof(struct group_source_req));
2210 gsa = (sockunion_t *)&gsr.gsr_group;
2211 gsa->ss.ss_family = AF_UNSPEC;
2212 ssa = (sockunion_t *)&gsr.gsr_source;
2213 ssa->ss.ss_family = AF_UNSPEC;
2214
2215 /*
2216 * Chew everything passed in up into a struct group_source_req
2217 * as that is easier to process.
2218 * Note: Any embedded scope ID in the multicast group passed
2219 * in by userland is ignored, the interface index is the recommended
2220 * mechanism to specify an interface; see below.
2221 */
2222 switch (sopt->sopt_name) {
2223 case IPV6_LEAVE_GROUP:
2224 error = sooptcopyin(sopt, &mreq, sizeof(struct ipv6_mreq),
2225 sizeof(struct ipv6_mreq));
2226 if (error)
2227 return (error);
2228 gsa->sin6.sin6_family = AF_INET6;
2229 gsa->sin6.sin6_len = sizeof(struct sockaddr_in6);
2230 gsa->sin6.sin6_addr = mreq.ipv6mr_multiaddr;
2231 gsa->sin6.sin6_port = 0;
2232 gsa->sin6.sin6_scope_id = 0;
2233 ifindex = mreq.ipv6mr_interface;
2234 break;
2235
2236 case MCAST_LEAVE_GROUP:
2237 case MCAST_LEAVE_SOURCE_GROUP:
2238 if (sopt->sopt_name == MCAST_LEAVE_GROUP) {
2239 error = sooptcopyin(sopt, &gsr,
2240 sizeof(struct group_req),
2241 sizeof(struct group_req));
2242 } else if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2243 error = sooptcopyin(sopt, &gsr,
2244 sizeof(struct group_source_req),
2245 sizeof(struct group_source_req));
2246 }
2247 if (error)
2248 return (error);
2249
2250 if (gsa->sin6.sin6_family != AF_INET6 ||
2251 gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
2252 return (EINVAL);
2253 if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2254 if (ssa->sin6.sin6_family != AF_INET6 ||
2255 ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
2256 return (EINVAL);
2257 if (IN6_IS_ADDR_MULTICAST(&ssa->sin6.sin6_addr))
2258 return (EINVAL);
2259 /*
2260 * TODO: Validate embedded scope ID in source
2261 * list entry against passed-in ifp, if and only
2262 * if source list filter entry is iface or node local.
2263 */
2264 in6_clearscope(&ssa->sin6.sin6_addr);
2265 }
2266 gsa->sin6.sin6_port = 0;
2267 gsa->sin6.sin6_scope_id = 0;
2268 ifindex = gsr.gsr_interface;
2269 break;
2270
2271 default:
2272 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
2273 __func__, sopt->sopt_name);
2274 return (EOPNOTSUPP);
2275 break;
2276 }
2277
2278 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
2279 return (EINVAL);
2280
2281 /*
2282 * Validate interface index if provided. If no interface index
2283 * was provided separately, attempt to look the membership up
2284 * from the default scope as a last resort to disambiguate
2285 * the membership we are being asked to leave.
2286 * XXX SCOPE6 lock potentially taken here.
2287 */
2288 if (ifindex != 0) {
2289 NET_EPOCH_ENTER(et);
2290 ifp = ifnet_byindex(ifindex);
2291 NET_EPOCH_EXIT(et); /* XXXGL: unsafe ifp */
2292 if (ifp == NULL)
2293 return (EADDRNOTAVAIL);
2294 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
2295 } else {
2296 error = sa6_embedscope(&gsa->sin6, V_ip6_use_defzone);
2297 if (error)
2298 return (EADDRNOTAVAIL);
2299 /*
2300 * Some badly behaved applications don't pass an ifindex
2301 * or a scope ID, which is an API violation. In this case,
2302 * perform a lookup as per a v6 join.
2303 *
2304 * XXX For now, stomp on zone ID for the corner case.
2305 * This is not the 'KAME way', but we need to see the ifp
2306 * directly until such time as this implementation is
2307 * refactored, assuming the scope IDs are the way to go.
2308 */
2309 ifindex = ntohs(gsa->sin6.sin6_addr.s6_addr16[1]);
2310 if (ifindex == 0) {
2311 CTR2(KTR_MLD, "%s: warning: no ifindex, looking up "
2312 "ifp for group %s.", __func__,
2313 ip6_sprintf(ip6tbuf, &gsa->sin6.sin6_addr));
2314 ifp = in6p_lookup_mcast_ifp(inp, &gsa->sin6);
2315 } else {
2316 NET_EPOCH_ENTER(et);
2317 ifp = ifnet_byindex(ifindex);
2318 NET_EPOCH_EXIT(et); /* XXXGL: unsafe ifp */
2319 }
2320 if (ifp == NULL)
2321 return (EADDRNOTAVAIL);
2322 }
2323
2324 CTR2(KTR_MLD, "%s: ifp = %p", __func__, ifp);
2325 KASSERT(ifp != NULL, ("%s: ifp did not resolve", __func__));
2326
2327 IN6_MULTI_LOCK();
2328
2329 /*
2330 * Find the membership in the membership list.
2331 */
2332 imo = in6p_findmoptions(inp);
2333 imf = im6o_match_group(imo, ifp, &gsa->sa);
2334 if (imf == NULL) {
2335 error = EADDRNOTAVAIL;
2336 goto out_in6p_locked;
2337 }
2338 inm = imf->im6f_in6m;
2339
2340 if (ssa->ss.ss_family != AF_UNSPEC)
2341 is_final = false;
2342
2343 /*
2344 * Begin state merge transaction at socket layer.
2345 */
2346 INP_WLOCK_ASSERT(inp);
2347
2348 /*
2349 * If we were instructed only to leave a given source, do so.
2350 * MCAST_LEAVE_SOURCE_GROUP is only valid for inclusive memberships.
2351 */
2352 if (is_final) {
2353 ip6_mfilter_remove(&imo->im6o_head, imf);
2354 im6f_leave(imf);
2355
2356 /*
2357 * Give up the multicast address record to which
2358 * the membership points.
2359 */
2360 (void)in6_leavegroup_locked(inm, imf);
2361 } else {
2362 if (imf->im6f_st[0] == MCAST_EXCLUDE) {
2363 error = EADDRNOTAVAIL;
2364 goto out_in6p_locked;
2365 }
2366 ims = im6o_match_source(imf, &ssa->sa);
2367 if (ims == NULL) {
2368 CTR3(KTR_MLD, "%s: source %p %spresent", __func__,
2369 ip6_sprintf(ip6tbuf, &ssa->sin6.sin6_addr),
2370 "not ");
2371 error = EADDRNOTAVAIL;
2372 goto out_in6p_locked;
2373 }
2374 CTR2(KTR_MLD, "%s: %s source", __func__, "block");
2375 error = im6f_prune(imf, &ssa->sin6);
2376 if (error) {
2377 CTR1(KTR_MLD, "%s: merge imf state failed",
2378 __func__);
2379 goto out_in6p_locked;
2380 }
2381 }
2382
2383 /*
2384 * Begin state merge transaction at MLD layer.
2385 */
2386 if (!is_final) {
2387 CTR1(KTR_MLD, "%s: merge inm state", __func__);
2388 IN6_MULTI_LIST_LOCK();
2389 error = in6m_merge(inm, imf);
2390 if (error) {
2391 CTR1(KTR_MLD, "%s: failed to merge inm state",
2392 __func__);
2393 IN6_MULTI_LIST_UNLOCK();
2394 im6f_rollback(imf);
2395 im6f_reap(imf);
2396 goto out_in6p_locked;
2397 }
2398
2399 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
2400 error = mld_change_state(inm, 0);
2401 IN6_MULTI_LIST_UNLOCK();
2402 if (error) {
2403 CTR1(KTR_MLD, "%s: failed mld downcall",
2404 __func__);
2405 im6f_rollback(imf);
2406 im6f_reap(imf);
2407 goto out_in6p_locked;
2408 }
2409 }
2410
2411 im6f_commit(imf);
2412 im6f_reap(imf);
2413
2414out_in6p_locked:
2415 INP_WUNLOCK(inp);
2416
2417 if (is_final && imf)
2418 ip6_mfilter_free(imf);
2419
2420 IN6_MULTI_UNLOCK();
2421 return (error);
2422}
2423
2424/*
2425 * Select the interface for transmitting IPv6 multicast datagrams.
2426 *
2427 * Either an instance of struct in6_addr or an instance of struct ipv6_mreqn
2428 * may be passed to this socket option. An address of in6addr_any or an
2429 * interface index of 0 is used to remove a previous selection.
2430 * When no interface is selected, one is chosen for every send.
2431 */
2432static int
2433in6p_set_multicast_if(struct inpcb *inp, struct sockopt *sopt)
2434{
2435 struct epoch_tracker et;
2436 struct ifnet *ifp;
2437 struct ip6_moptions *imo;
2438 u_int ifindex;
2439 int error;
2440
2441 if (sopt->sopt_valsize != sizeof(u_int))
2442 return (EINVAL);
2443
2444 error = sooptcopyin(sopt, &ifindex, sizeof(u_int), sizeof(u_int));
2445 if (error)
2446 return (error);
2447 NET_EPOCH_ENTER(et);
2448 if (ifindex == 0)
2449 ifp = NULL;
2450 else {
2451 ifp = ifnet_byindex(ifindex);
2452 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
2453 NET_EPOCH_EXIT(et);
2454 return (EADDRNOTAVAIL);
2455 }
2456 }
2457 NET_EPOCH_EXIT(et); /* XXXGL: unsafe ifp */
2458 imo = in6p_findmoptions(inp);
2459 imo->im6o_multicast_ifp = ifp;
2460 INP_WUNLOCK(inp);
2461
2462 return (0);
2463}
2464
2465/*
2466 * Atomically set source filters on a socket for an IPv6 multicast group.
2467 *
2468 * XXXGL: unsafely exits epoch with ifnet pointer
2469 */
2470static int
2471in6p_set_source_filters(struct inpcb *inp, struct sockopt *sopt)
2472{
2473 struct __msfilterreq msfr;
2474 struct epoch_tracker et;
2475 sockunion_t *gsa;
2476 struct ifnet *ifp;
2477 struct in6_mfilter *imf;
2478 struct ip6_moptions *imo;
2479 struct in6_multi *inm;
2480 int error;
2481
2482 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
2483 sizeof(struct __msfilterreq));
2484 if (error)
2485 return (error);
2486
2487 if (msfr.msfr_nsrcs > in6_mcast_maxsocksrc)
2488 return (ENOBUFS);
2489
2490 if (msfr.msfr_fmode != MCAST_EXCLUDE &&
2491 msfr.msfr_fmode != MCAST_INCLUDE)
2492 return (EINVAL);
2493
2494 if (msfr.msfr_group.ss_family != AF_INET6 ||
2495 msfr.msfr_group.ss_len != sizeof(struct sockaddr_in6))
2496 return (EINVAL);
2497
2498 gsa = (sockunion_t *)&msfr.msfr_group;
2499 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
2500 return (EINVAL);
2501
2502 gsa->sin6.sin6_port = 0; /* ignore port */
2503
2504 NET_EPOCH_ENTER(et);
2505 ifp = ifnet_byindex(msfr.msfr_ifindex);
2506 NET_EPOCH_EXIT(et);
2507 if (ifp == NULL)
2508 return (EADDRNOTAVAIL);
2509 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
2510
2511 /*
2512 * Take the INP write lock.
2513 * Check if this socket is a member of this group.
2514 */
2515 imo = in6p_findmoptions(inp);
2516 imf = im6o_match_group(imo, ifp, &gsa->sa);
2517 if (imf == NULL) {
2518 error = EADDRNOTAVAIL;
2519 goto out_in6p_locked;
2520 }
2521 inm = imf->im6f_in6m;
2522
2523 /*
2524 * Begin state merge transaction at socket layer.
2525 */
2526 INP_WLOCK_ASSERT(inp);
2527
2528 imf->im6f_st[1] = msfr.msfr_fmode;
2529
2530 /*
2531 * Apply any new source filters, if present.
2532 * Make a copy of the user-space source vector so
2533 * that we may copy them with a single copyin. This
2534 * allows us to deal with page faults up-front.
2535 */
2536 if (msfr.msfr_nsrcs > 0) {
2537 struct in6_msource *lims;
2538 struct sockaddr_in6 *psin;
2539 struct sockaddr_storage *kss, *pkss;
2540 int i;
2541
2542 INP_WUNLOCK(inp);
2543
2544 CTR2(KTR_MLD, "%s: loading %lu source list entries",
2545 __func__, (unsigned long)msfr.msfr_nsrcs);
2546 kss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
2547 M_TEMP, M_WAITOK);
2548 error = copyin(msfr.msfr_srcs, kss,
2549 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
2550 if (error) {
2551 free(kss, M_TEMP);
2552 return (error);
2553 }
2554
2555 INP_WLOCK(inp);
2556
2557 /*
2558 * Mark all source filters as UNDEFINED at t1.
2559 * Restore new group filter mode, as im6f_leave()
2560 * will set it to INCLUDE.
2561 */
2562 im6f_leave(imf);
2563 imf->im6f_st[1] = msfr.msfr_fmode;
2564
2565 /*
2566 * Update socket layer filters at t1, lazy-allocating
2567 * new entries. This saves a bunch of memory at the
2568 * cost of one RB_FIND() per source entry; duplicate
2569 * entries in the msfr_nsrcs vector are ignored.
2570 * If we encounter an error, rollback transaction.
2571 *
2572 * XXX This too could be replaced with a set-symmetric
2573 * difference like loop to avoid walking from root
2574 * every time, as the key space is common.
2575 */
2576 for (i = 0, pkss = kss; i < msfr.msfr_nsrcs; i++, pkss++) {
2577 psin = (struct sockaddr_in6 *)pkss;
2578 if (psin->sin6_family != AF_INET6) {
2579 error = EAFNOSUPPORT;
2580 break;
2581 }
2582 if (psin->sin6_len != sizeof(struct sockaddr_in6)) {
2583 error = EINVAL;
2584 break;
2585 }
2586 if (IN6_IS_ADDR_MULTICAST(&psin->sin6_addr)) {
2587 error = EINVAL;
2588 break;
2589 }
2590 /*
2591 * TODO: Validate embedded scope ID in source
2592 * list entry against passed-in ifp, if and only
2593 * if source list filter entry is iface or node local.
2594 */
2595 in6_clearscope(&psin->sin6_addr);
2596 error = im6f_get_source(imf, psin, &lims);
2597 if (error)
2598 break;
2599 lims->im6sl_st[1] = imf->im6f_st[1];
2600 }
2601 free(kss, M_TEMP);
2602 }
2603
2604 if (error)
2605 goto out_im6f_rollback;
2606
2607 INP_WLOCK_ASSERT(inp);
2608 IN6_MULTI_LIST_LOCK();
2609
2610 /*
2611 * Begin state merge transaction at MLD layer.
2612 */
2613 CTR1(KTR_MLD, "%s: merge inm state", __func__);
2614 error = in6m_merge(inm, imf);
2615 if (error)
2616 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
2617 else {
2618 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
2619 error = mld_change_state(inm, 0);
2620 if (error)
2621 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
2622 }
2623
2624 IN6_MULTI_LIST_UNLOCK();
2625
2626out_im6f_rollback:
2627 if (error)
2628 im6f_rollback(imf);
2629 else
2630 im6f_commit(imf);
2631
2632 im6f_reap(imf);
2633
2634out_in6p_locked:
2635 INP_WUNLOCK(inp);
2636 return (error);
2637}
2638
2639/*
2640 * Set the IP multicast options in response to user setsockopt().
2641 *
2642 * Many of the socket options handled in this function duplicate the
2643 * functionality of socket options in the regular unicast API. However,
2644 * it is not possible to merge the duplicate code, because the idempotence
2645 * of the IPv6 multicast part of the BSD Sockets API must be preserved;
2646 * the effects of these options must be treated as separate and distinct.
2647 *
2648 * SMPng: XXX: Unlocked read of inp_socket believed OK.
2649 */
2650int
2651ip6_setmoptions(struct inpcb *inp, struct sockopt *sopt)
2652{
2653 struct ip6_moptions *im6o;
2654 int error;
2655
2656 error = 0;
2657
2658 /*
2659 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
2660 * or is a divert socket, reject it.
2661 */
2662 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
2663 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
2664 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM))
2665 return (EOPNOTSUPP);
2666
2667 switch (sopt->sopt_name) {
2668 case IPV6_MULTICAST_IF:
2669 error = in6p_set_multicast_if(inp, sopt);
2670 break;
2671
2672 case IPV6_MULTICAST_HOPS: {
2673 int hlim;
2674
2675 if (sopt->sopt_valsize != sizeof(int)) {
2676 error = EINVAL;
2677 break;
2678 }
2679 error = sooptcopyin(sopt, &hlim, sizeof(hlim), sizeof(int));
2680 if (error)
2681 break;
2682 if (hlim < -1 || hlim > 255) {
2683 error = EINVAL;
2684 break;
2685 } else if (hlim == -1) {
2686 hlim = V_ip6_defmcasthlim;
2687 }
2688 im6o = in6p_findmoptions(inp);
2689 im6o->im6o_multicast_hlim = hlim;
2690 INP_WUNLOCK(inp);
2691 break;
2692 }
2693
2694 case IPV6_MULTICAST_LOOP: {
2695 u_int loop;
2696
2697 /*
2698 * Set the loopback flag for outgoing multicast packets.
2699 * Must be zero or one.
2700 */
2701 if (sopt->sopt_valsize != sizeof(u_int)) {
2702 error = EINVAL;
2703 break;
2704 }
2705 error = sooptcopyin(sopt, &loop, sizeof(u_int), sizeof(u_int));
2706 if (error)
2707 break;
2708 if (loop > 1) {
2709 error = EINVAL;
2710 break;
2711 }
2712 im6o = in6p_findmoptions(inp);
2713 im6o->im6o_multicast_loop = loop;
2714 INP_WUNLOCK(inp);
2715 break;
2716 }
2717
2718 case IPV6_JOIN_GROUP:
2719 case MCAST_JOIN_GROUP:
2720 case MCAST_JOIN_SOURCE_GROUP:
2721 error = in6p_join_group(inp, sopt);
2722 break;
2723
2724 case IPV6_LEAVE_GROUP:
2725 case MCAST_LEAVE_GROUP:
2726 case MCAST_LEAVE_SOURCE_GROUP:
2727 error = in6p_leave_group(inp, sopt);
2728 break;
2729
2730 case MCAST_BLOCK_SOURCE:
2731 case MCAST_UNBLOCK_SOURCE:
2732 error = in6p_block_unblock_source(inp, sopt);
2733 break;
2734
2735 case IPV6_MSFILTER:
2736 error = in6p_set_source_filters(inp, sopt);
2737 break;
2738
2739 default:
2740 error = EOPNOTSUPP;
2741 break;
2742 }
2743
2744 INP_UNLOCK_ASSERT(inp);
2745
2746 return (error);
2747}
2748
2749/*
2750 * Expose MLD's multicast filter mode and source list(s) to userland,
2751 * keyed by (ifindex, group).
2752 * The filter mode is written out as a uint32_t, followed by
2753 * 0..n of struct in6_addr.
2754 * For use by ifmcstat(8).
2755 * SMPng: NOTE: unlocked read of ifindex space.
2756 */
2757static int
2758sysctl_ip6_mcast_filters(SYSCTL_HANDLER_ARGS)
2759{
2760 struct in6_addr mcaddr;
2761 struct in6_addr src;
2762 struct epoch_tracker et;
2763 struct ifnet *ifp;
2764 struct ifmultiaddr *ifma;
2765 struct in6_multi *inm;
2766 struct ip6_msource *ims;
2767 int *name;
2768 int retval;
2769 u_int namelen;
2770 uint32_t fmode, ifindex;
2771#ifdef KTR
2772 char ip6tbuf[INET6_ADDRSTRLEN];
2773#endif
2774
2775 name = (int *)arg1;
2776 namelen = arg2;
2777
2778 if (req->newptr != NULL)
2779 return (EPERM);
2780
2781 /* int: ifindex + 4 * 32 bits of IPv6 address */
2782 if (namelen != 5)
2783 return (EINVAL);
2784
2785 memcpy(&mcaddr, &name[1], sizeof(struct in6_addr));
2786 if (!IN6_IS_ADDR_MULTICAST(&mcaddr)) {
2787 CTR2(KTR_MLD, "%s: group %s is not multicast",
2788 __func__, ip6_sprintf(ip6tbuf, &mcaddr));
2789 return (EINVAL);
2790 }
2791
2792 ifindex = name[0];
2793 NET_EPOCH_ENTER(et);
2794 ifp = ifnet_byindex(ifindex);
2795 if (ifp == NULL) {
2796 NET_EPOCH_EXIT(et);
2797 CTR2(KTR_MLD, "%s: no ifp for ifindex %u",
2798 __func__, ifindex);
2799 return (ENOENT);
2800 }
2801 /*
2802 * Internal MLD lookups require that scope/zone ID is set.
2803 */
2804 (void)in6_setscope(&mcaddr, ifp, NULL);
2805
2806 retval = sysctl_wire_old_buffer(req,
2807 sizeof(uint32_t) + (in6_mcast_maxgrpsrc * sizeof(struct in6_addr)));
2808 if (retval) {
2809 NET_EPOCH_EXIT(et);
2810 return (retval);
2811 }
2812
2813 IN6_MULTI_LOCK();
2814 IN6_MULTI_LIST_LOCK();
2815 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2816 inm = in6m_ifmultiaddr_get_inm(ifma);
2817 if (inm == NULL)
2818 continue;
2819 if (!IN6_ARE_ADDR_EQUAL(&inm->in6m_addr, &mcaddr))
2820 continue;
2821 fmode = inm->in6m_st[1].iss_fmode;
2822 retval = SYSCTL_OUT(req, &fmode, sizeof(uint32_t));
2823 if (retval != 0)
2824 break;
2825 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
2826 CTR2(KTR_MLD, "%s: visit node %p", __func__, ims);
2827 /*
2828 * Only copy-out sources which are in-mode.
2829 */
2830 if (fmode != im6s_get_mode(inm, ims, 1)) {
2831 CTR1(KTR_MLD, "%s: skip non-in-mode",
2832 __func__);
2833 continue;
2834 }
2835 src = ims->im6s_addr;
2836 retval = SYSCTL_OUT(req, &src,
2837 sizeof(struct in6_addr));
2838 if (retval != 0)
2839 break;
2840 }
2841 }
2842 IN6_MULTI_LIST_UNLOCK();
2843 IN6_MULTI_UNLOCK();
2844 NET_EPOCH_EXIT(et);
2845
2846 return (retval);
2847}
2848
2849#ifdef KTR
2850
2851static const char *in6m_modestrs[] = { "un", "in", "ex" };
2852
2853static const char *
2854in6m_mode_str(const int mode)
2855{
2856
2857 if (mode >= MCAST_UNDEFINED && mode <= MCAST_EXCLUDE)
2858 return (in6m_modestrs[mode]);
2859 return ("??");
2860}
2861
2862static const char *in6m_statestrs[] = {
2863 "not-member",
2864 "silent",
2865 "idle",
2866 "lazy",
2867 "sleeping",
2868 "awakening",
2869 "query-pending",
2870 "sg-query-pending",
2871 "leaving"
2872};
2873
2874static const char *
2875in6m_state_str(const int state)
2876{
2877
2878 if (state >= MLD_NOT_MEMBER && state <= MLD_LEAVING_MEMBER)
2879 return (in6m_statestrs[state]);
2880 return ("??");
2881}
2882
2883/*
2884 * Dump an in6_multi structure to the console.
2885 */
2886void
2887in6m_print(const struct in6_multi *inm)
2888{
2889 int t;
2890 char ip6tbuf[INET6_ADDRSTRLEN];
2891
2892 if ((ktr_mask & KTR_MLD) == 0)
2893 return;
2894
2895 printf("%s: --- begin in6m %p ---\n", __func__, inm);
2896 printf("addr %s ifp %p(%s) ifma %p\n",
2897 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2898 inm->in6m_ifp,
2899 if_name(inm->in6m_ifp),
2900 inm->in6m_ifma);
2901 printf("timer %u state %s refcount %u scq.len %u\n",
2902 inm->in6m_timer,
2903 in6m_state_str(inm->in6m_state),
2904 inm->in6m_refcount,
2905 mbufq_len(&inm->in6m_scq));
2906 printf("mli %p nsrc %lu sctimer %u scrv %u\n",
2907 inm->in6m_mli,
2908 inm->in6m_nsrc,
2909 inm->in6m_sctimer,
2910 inm->in6m_scrv);
2911 for (t = 0; t < 2; t++) {
2912 printf("t%d: fmode %s asm %u ex %u in %u rec %u\n", t,
2913 in6m_mode_str(inm->in6m_st[t].iss_fmode),
2914 inm->in6m_st[t].iss_asm,
2915 inm->in6m_st[t].iss_ex,
2916 inm->in6m_st[t].iss_in,
2917 inm->in6m_st[t].iss_rec);
2918 }
2919 printf("%s: --- end in6m %p ---\n", __func__, inm);
2920}
2921
2922#else /* !KTR */
2923
2924void
2925in6m_print(const struct in6_multi *inm)
2926{
2927
2928}
2929
2930#endif /* KTR */
ip6_sprintf
char * ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
Definition: in6.c:1637
IPV6_MAX_MEMBERSHIPS
#define IPV6_MAX_MEMBERSHIPS
Definition: in6.h:528
IPV6_MULTICAST_LOOP
#define IPV6_MULTICAST_LOOP
Definition: in6.h:416
IPV6_MSFILTER
#define IPV6_MSFILTER
Definition: in6.h:507
IPV6_DEFAULT_MULTICAST_LOOP
#define IPV6_DEFAULT_MULTICAST_LOOP
Definition: in6.h:523
IPV6_JOIN_GROUP
#define IPV6_JOIN_GROUP
Definition: in6.h:417
IN6_IS_ADDR_MC_LINKLOCAL
#define IN6_IS_ADDR_MC_LINKLOCAL(a)
Definition: in6.h:322
IPV6_MAX_SOCK_SRC_FILTER
#define IPV6_MAX_SOCK_SRC_FILTER
Definition: in6.h:535
IPV6_LEAVE_GROUP
#define IPV6_LEAVE_GROUP
Definition: in6.h:418
IPV6_MULTICAST_HOPS
#define IPV6_MULTICAST_HOPS
Definition: in6.h:415
IN6_ARE_ADDR_EQUAL
#define IN6_ARE_ADDR_EQUAL(a, b)
Definition: in6.h:227
IPV6_MAX_GROUP_SRC_FILTER
#define IPV6_MAX_GROUP_SRC_FILTER
Definition: in6.h:534
IN6_IS_ADDR_MULTICAST
#define IN6_IS_ADDR_MULTICAST(a)
Definition: in6.h:304
IN6_IS_ADDR_MC_INTFACELOCAL
#define IN6_IS_ADDR_MC_INTFACELOCAL(a)
Definition: in6.h:319
INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN
Definition: in6.h:112
IPV6_MULTICAST_IF
#define IPV6_MULTICAST_IF
Definition: in6.h:414
in6_fib.h
fib6_lookup
struct nhop_object * fib6_lookup(uint32_t fibnum, const struct in6_addr *dst6, uint32_t scopeid, uint32_t flags, uint32_t flowid)
in6m_release_wait
void in6m_release_wait(void *arg __unused)
Definition: in6_mcast.c:544
im6f_commit
static void im6f_commit(struct in6_mfilter *)
Definition: in6_mcast.c:858
MALLOC_DEFINE
static MALLOC_DEFINE(M_IN6MFILTER, "in6_mfilter", "IPv6 multicast PCB-layer source filter")
KTR_MLD
#define KTR_MLD
Definition: in6_mcast.c:80
in6m_clear_recorded
void in6m_clear_recorded(struct in6_multi *inm)
Definition: in6_mcast.c:638
in6p_findmoptions
static struct ip6_moptions * in6p_findmoptions(struct inpcb *)
Definition: in6_mcast.c:1564
in6_getmulti
static int in6_getmulti(struct ifnet *, const struct in6_addr *, struct in6_multi **)
Definition: in6_mcast.c:357
TASKQUEUE_DEFINE_THREAD
TASKQUEUE_DEFINE_THREAD(in6m_free)
SYSCTL_DECL
SYSCTL_DECL(_net_inet6_ip6)
ip6_getmoptions
int ip6_getmoptions(struct inpcb *inp, struct sockopt *sopt)
Definition: in6_mcast.c:1767
in6_leavegroup
int in6_leavegroup(struct in6_multi *inm, struct in6_mfilter *imf)
Definition: in6_mcast.c:1302
SYSCTL_ULONG
SYSCTL_ULONG(_net_inet6_ip6_mcast, OID_AUTO, maxgrpsrc, CTLFLAG_RWTUN, &in6_mcast_maxgrpsrc, 0, "Max source filters per group")
ip6_setmoptions
int ip6_setmoptions(struct inpcb *inp, struct sockopt *sopt)
Definition: in6_mcast.c:2651
im6o_match_source
static struct in6_msource * im6o_match_source(struct in6_mfilter *, const struct sockaddr *)
Definition: in6_mcast.c:293
RB_GENERATE
RB_GENERATE(ip6_msource_tree, ip6_msource, im6s_link, ip6_msource_cmp)
in6m_merge
static int in6m_merge(struct in6_multi *, struct in6_mfilter *)
Definition: in6_mcast.c:999
in6p_block_unblock_source
static int in6p_block_unblock_source(struct inpcb *, struct sockopt *)
Definition: in6_mcast.c:1402
in6p_set_multicast_if
static int in6p_set_multicast_if(struct inpcb *, struct sockopt *)
Definition: in6_mcast.c:2433
im6o_match_group
static struct in6_mfilter * im6o_match_group(const struct ip6_moptions *, const struct ifnet *, const struct sockaddr *)
Definition: in6_mcast.c:259
in6m_release_task
static void in6m_release_task(void *arg __unused, int pending __unused)
Definition: in6_mcast.c:615
in6m_disconnect_locked
void in6m_disconnect_locked(struct in6_multi_head *inmh, struct in6_multi *inm)
Definition: in6_mcast.c:559
ip6_freemoptions
void ip6_freemoptions(struct ip6_moptions *imo)
Definition: in6_mcast.c:1625
SYSCTL_INT
SYSCTL_INT(_net_inet6_ip6_mcast, OID_AUTO, loop, CTLFLAG_RWTUN, &in6_mcast_loop, 0, "Loopback multicast datagrams by default")
im6f_purge
static void im6f_purge(struct in6_mfilter *)
Definition: in6_mcast.c:895
in6m_purge
static void in6m_purge(struct in6_multi *)
Definition: in6_mcast.c:1166
in6m_record_source
int in6m_record_source(struct in6_multi *inm, const struct in6_addr *addr)
Definition: in6_mcast.c:677
im6f_prune
static int im6f_prune(struct in6_mfilter *, const struct sockaddr_in6 *)
Definition: in6_mcast.c:795
im6f_reap
static void im6f_reap(struct in6_mfilter *)
Definition: in6_mcast.c:874
sysctl_ip6_mcast_filters
static int sysctl_ip6_mcast_filters(SYSCTL_HANDLER_ARGS)
Definition: in6_mcast.c:2758
in6m_free_list
static struct in6_multi_head in6m_free_list
Definition: in6_mcast.c:528
in6m_get_source
static int in6m_get_source(struct in6_multi *inm, const struct in6_addr *addr, const int noalloc, struct ip6_msource **pims)
Definition: in6_mcast.c:922
im6f_rollback
static void im6f_rollback(struct in6_mfilter *)
Definition: in6_mcast.c:814
im6f_leave
static void im6f_leave(struct in6_mfilter *)
Definition: in6_mcast.c:842
in6_multi_sx
struct sx in6_multi_sx
Definition: in6_mcast.c:121
in6m_reap
static void in6m_reap(struct in6_multi *)
Definition: in6_mcast.c:1146
im6f_graft
static struct in6_msource * im6f_graft(struct in6_mfilter *, const uint8_t, const struct sockaddr_in6 *)
Definition: in6_mcast.c:766
__FBSDID
__FBSDID("$FreeBSD$")
im6f_init
static __inline void im6f_init(struct in6_mfilter *imf, const int st0, const int st1)
Definition: in6_mcast.c:224
in6_mcast_maxsocksrc
static u_long in6_mcast_maxsocksrc
Definition: in6_mcast.c:180
ip6_mfilter_alloc
struct in6_mfilter * ip6_mfilter_alloc(const int mflags, const int st0, const int st1)
Definition: in6_mcast.c:233
in6_mcast_maxgrpsrc
static u_long in6_mcast_maxgrpsrc
Definition: in6_mcast.c:175
in6_joingroup_locked
static int in6_joingroup_locked(struct ifnet *, const struct in6_addr *, struct in6_mfilter *, struct in6_multi **, int)
Definition: in6_mcast.c:1209
in6_mcast_loop
int in6_mcast_loop
Definition: in6_mcast.c:186
SYSCTL_NODE
static SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, mcast, CTLFLAG_RW|CTLFLAG_MPSAFE, 0, "IPv6 multicast")
in6_multi_free_mtx
struct mtx in6_multi_free_mtx
Definition: in6_mcast.c:118
in6_leavegroup_locked
int in6_leavegroup_locked(struct in6_multi *inm, struct in6_mfilter *imf)
Definition: in6_mcast.c:1326
inp_gcmoptions
static void inp_gcmoptions(struct ip6_moptions *imo)
Definition: in6_mcast.c:1600
in6p_leave_group
static int in6p_leave_group(struct inpcb *, struct sockopt *)
Definition: in6_mcast.c:2186
im6s_merge
static void im6s_merge(struct ip6_msource *ims, const struct in6_msource *lims, const int rollback)
Definition: in6_mcast.c:957
im6o_mc_filter
int im6o_mc_filter(const struct ip6_moptions *imo, const struct ifnet *ifp, const struct sockaddr *group, const struct sockaddr *src)
Definition: in6_mcast.c:316
im6f_get_source
static int im6f_get_source(struct in6_mfilter *imf, const struct sockaddr_in6 *psin, struct in6_msource **)
Definition: in6_mcast.c:723
MTX_SYSINIT
MTX_SYSINIT(in6_multi_mtx, &in6_multi_list_mtx, "in6_multi_list_mtx", MTX_DEF)
in6m_release_list_deferred
void in6m_release_list_deferred(struct in6_multi_head *inmh)
Definition: in6_mcast.c:533
in6m_free_task
static struct task in6m_free_task
Definition: in6_mcast.c:530
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void ip6_mfilter_free(struct in6_mfilter *imf)
Definition: in6_mcast.c:246
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struct mtx in6_multi_list_mtx
Definition: in6_mcast.c:115
in6m_print
void in6m_print(const struct in6_multi *inm)
Definition: in6_mcast.c:2925
SX_SYSINIT
SX_SYSINIT(in6_multi_sx, &in6_multi_sx, "in6_multi_sx")
in6m_release
static void in6m_release(struct in6_multi *inm)
Definition: in6_mcast.c:488
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static int in6p_set_source_filters(struct inpcb *, struct sockopt *)
Definition: in6_mcast.c:2471
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int in6_joingroup(struct ifnet *ifp, const struct in6_addr *mcaddr, struct in6_mfilter *imf, struct in6_multi **pinm, const int delay)
Definition: in6_mcast.c:1187
in6m_commit
void in6m_commit(struct in6_multi *inm)
Definition: in6_mcast.c:1128
in6p_get_source_filters
static int in6p_get_source_filters(struct inpcb *, struct sockopt *)
Definition: in6_mcast.c:1637
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static int in6p_join_group(struct inpcb *, struct sockopt *)
Definition: in6_mcast.c:1878
in6p_lookup_mcast_ifp
static struct ifnet * in6p_lookup_mcast_ifp(const struct inpcb *, const struct sockaddr_in6 *)
Definition: in6_mcast.c:1851
in6_var.h
IN6_MULTI_LOCK_ASSERT
#define IN6_MULTI_LOCK_ASSERT()
Definition: in6_var.h:765
IN6_MULTI_LIST_UNLOCK_ASSERT
#define IN6_MULTI_LIST_UNLOCK_ASSERT()
Definition: in6_var.h:761
in6m_acquire_locked
static __inline void in6m_acquire_locked(struct in6_multi *inm)
Definition: in6_var.h:827
in6m_rele_locked
static __inline void in6m_rele_locked(struct in6_multi_head *inmh, struct in6_multi *inm)
Definition: in6_var.h:843
ip6_mfilter_remove
static void ip6_mfilter_remove(struct ip6_mfilter_head *head, struct in6_mfilter *imf)
Definition: in6_var.h:638
IN6_MULTI_LIST_LOCK
#define IN6_MULTI_LIST_LOCK()
Definition: in6_var.h:758
ip6_mfilter_insert
static void ip6_mfilter_insert(struct ip6_mfilter_head *head, struct in6_mfilter *imf)
Definition: in6_var.h:631
IP6_MFILTER_FOREACH
#define IP6_MFILTER_FOREACH(imf, head)
Definition: in6_var.h:644
in6m_ifmultiaddr_get_inm
static __inline struct in6_multi * in6m_ifmultiaddr_get_inm(struct ifmultiaddr *ifma)
Definition: in6_var.h:773
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static __inline struct in6_multi * in6m_lookup_locked(struct ifnet *ifp, const struct in6_addr *mcaddr)
Definition: in6_var.h:791
IN6_MULTI_LOCK
#define IN6_MULTI_LOCK()
Definition: in6_var.h:763
IN6_MULTI_UNLOCK
#define IN6_MULTI_UNLOCK()
Definition: in6_var.h:764
IN6_MULTI_LIST_UNLOCK
#define IN6_MULTI_LIST_UNLOCK()
Definition: in6_var.h:759
IN6_MULTI_LIST_LOCK_ASSERT
#define IN6_MULTI_LIST_LOCK_ASSERT()
Definition: in6_var.h:760
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static size_t ip6_mfilter_count(struct ip6_mfilter_head *head)
Definition: in6_var.h:648
ip6_mfilter_first
static struct in6_mfilter * ip6_mfilter_first(const struct ip6_mfilter_head *head)
Definition: in6_var.h:624
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static __inline int ip6_msource_cmp(const struct ip6_msource *a, const struct ip6_msource *b)
Definition: in6_var.h:590
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static __inline uint8_t im6s_get_mode(const struct in6_multi *inm, const struct ip6_msource *ims, uint8_t t)
Definition: in6_var.h:736
ip6_var.h
V_ip6_defmcasthlim
#define V_ip6_defmcasthlim
Definition: ip6_var.h:281
V_ip6_use_defzone
#define V_ip6_use_defzone
Definition: ip6_var.h:326
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int mld_change_state(struct in6_multi *inm, const int delay)
Definition: mld6.c:1892
VNET_SYSUNINIT
VNET_SYSUNINIT(vnet_mld_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, vnet_mld_uninit, NULL)
mld6_var.h
MLD_MAX_STATE_CHANGES
#define MLD_MAX_STATE_CHANGES
Definition: mld6_var.h:143
MLD_NOT_MEMBER
#define MLD_NOT_MEMBER
Definition: mld6_var.h:43
MLD_LEAVING_MEMBER
#define MLD_LEAVING_MEMBER
Definition: mld6_var.h:52
MLD_IFINFO
#define MLD_IFINFO(ifp)
Definition: mld6_var.h:160
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int in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id)
Definition: scope6.c:406
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void in6_splitscope(const struct in6_addr *src, struct in6_addr *dst, uint32_t *scopeid)
Definition: scope6.c:534
in6_clearscope
int in6_clearscope(struct in6_addr *in6)
Definition: scope6.c:455
sa6_embedscope
int sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok)
Definition: scope6.c:324
scope6_var.h
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Definition: in6.h:97
in6_ifaddr
Definition: in6_var.h:121
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Definition: in6_var.h:600
in6_mfilter::im6f_st
uint8_t im6f_st[2]
Definition: in6_var.h:603
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struct in6_multi * im6f_in6m
Definition: in6_var.h:604
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u_long im6f_nsrc
Definition: in6_var.h:602
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struct ip6_msource_tree im6f_sources
Definition: in6_var.h:601
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Definition: in6_var.h:576
in6_msource::im6s_addr
struct in6_addr im6s_addr
Definition: in6_var.h:578
in6_msource::im6sl_st
uint8_t im6sl_st[2]
Definition: in6_var.h:579
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uint16_t iss_ex
Definition: in6_var.h:719
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uint16_t iss_rec
Definition: in6_var.h:721
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uint16_t iss_fmode
Definition: in6_var.h:717
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uint16_t iss_asm
Definition: in6_var.h:718
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uint16_t iss_in
Definition: in6_var.h:720
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Definition: in6_var.h:661
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struct in6_multi * i6mm_maddr
Definition: in6_var.h:662
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Definition: in6_var.h:688
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struct mld_ifsoftc * in6m_mli
Definition: in6_var.h:697
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uint16_t in6m_sctimer
Definition: in6_var.h:706
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Definition: in6_var.h:690
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Definition: in6_var.h:689
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Definition: in6_var.h:701
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Definition: in6_var.h:694
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Definition: in6_var.h:691
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Definition: in6_var.h:693
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Definition: in6_var.h:707
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Definition: in6_var.h:692
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struct ip6_msource_tree in6m_srcs
Definition: in6_var.h:700
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struct in6_multi::in6m_st in6m_st[2]
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struct mbufq in6m_scq
Definition: in6_var.h:703
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uint16_t in
Definition: in6_var.h:565
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Definition: in6_var.h:564
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Definition: in6_var.h:560
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struct ip6_msource::im6s_st im6s_st[2]
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Definition: in6_var.h:567
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Definition: in6_var.h:562
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Definition: in6.h:540
ipv6_mreq::ipv6mr_multiaddr
struct in6_addr ipv6mr_multiaddr
Definition: in6.h:541
ipv6_mreq::ipv6mr_interface
unsigned int ipv6mr_interface
Definition: in6.h:542
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Definition: in6.h:125
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Definition: in6.h:126
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in_port_t sin6_port
Definition: in6.h:128
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struct in6_addr sin6_addr
Definition: in6.h:130
sockaddr_in6::sin6_family
sa_family_t sin6_family
Definition: in6.h:127
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Definition: in6_mcast.c:85
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Definition: in6_mcast.c:87
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Definition: in6_mcast.c:86
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Definition: in6_mcast.c:88