1 /*
2 * Copyright (c) 2009 Bruce Simpson.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote
14 * products derived from this software without specific prior written
15 * permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /*
31 * IPv6 multicast socket, group, and socket option processing module.
32 * Normative references: RFC 2292, RFC 3492, RFC 3542, RFC 3678, RFC 3810.
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: releng/10.0/sys/netinet6/in6_mcast.c 254629 2013-08-22 00:51:37Z delphij $");
37
38 #include "opt_inet6.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/mbuf.h>
45 #include <sys/protosw.h>
46 #include <sys/socket.h>
47 #include <sys/socketvar.h>
48 #include <sys/protosw.h>
49 #include <sys/sysctl.h>
50 #include <sys/priv.h>
51 #include <sys/ktr.h>
52 #include <sys/tree.h>
53
54 #include <net/if.h>
55 #include <net/if_dl.h>
56 #include <net/route.h>
57 #include <net/vnet.h>
58
59 #include <netinet/in.h>
60 #include <netinet/in_var.h>
61 #include <netinet6/in6_var.h>
62 #include <netinet/ip6.h>
63 #include <netinet/icmp6.h>
64 #include <netinet6/ip6_var.h>
65 #include <netinet/in_pcb.h>
66 #include <netinet/tcp_var.h>
67 #include <netinet6/nd6.h>
68 #include <netinet6/mld6_var.h>
69 #include <netinet6/scope6_var.h>
70
71 #ifndef KTR_MLD
72 #define KTR_MLD KTR_INET6
73 #endif
74
75 #ifndef __SOCKUNION_DECLARED
76 union sockunion {
77 struct sockaddr_storage ss;
78 struct sockaddr sa;
79 struct sockaddr_dl sdl;
80 struct sockaddr_in6 sin6;
81 };
82 typedef union sockunion sockunion_t;
83 #define __SOCKUNION_DECLARED
84 #endif /* __SOCKUNION_DECLARED */
85
86 static MALLOC_DEFINE(M_IN6MFILTER, "in6_mfilter",
87 "IPv6 multicast PCB-layer source filter");
88 static MALLOC_DEFINE(M_IP6MADDR, "in6_multi", "IPv6 multicast group");
89 static MALLOC_DEFINE(M_IP6MOPTS, "ip6_moptions", "IPv6 multicast options");
90 static MALLOC_DEFINE(M_IP6MSOURCE, "ip6_msource",
91 "IPv6 multicast MLD-layer source filter");
92
93 RB_GENERATE(ip6_msource_tree, ip6_msource, im6s_link, ip6_msource_cmp);
94
95 /*
96 * Locking:
97 * - Lock order is: Giant, INP_WLOCK, IN6_MULTI_LOCK, MLD_LOCK, IF_ADDR_LOCK.
98 * - The IF_ADDR_LOCK is implicitly taken by in6m_lookup() earlier, however
99 * it can be taken by code in net/if.c also.
100 * - ip6_moptions and in6_mfilter are covered by the INP_WLOCK.
101 *
102 * struct in6_multi is covered by IN6_MULTI_LOCK. There isn't strictly
103 * any need for in6_multi itself to be virtualized -- it is bound to an ifp
104 * anyway no matter what happens.
105 */
106 struct mtx in6_multi_mtx;
107 MTX_SYSINIT(in6_multi_mtx, &in6_multi_mtx, "in6_multi_mtx", MTX_DEF);
108
109 static void im6f_commit(struct in6_mfilter *);
110 static int im6f_get_source(struct in6_mfilter *imf,
111 const struct sockaddr_in6 *psin,
112 struct in6_msource **);
113 static struct in6_msource *
114 im6f_graft(struct in6_mfilter *, const uint8_t,
115 const struct sockaddr_in6 *);
116 static void im6f_leave(struct in6_mfilter *);
117 static int im6f_prune(struct in6_mfilter *, const struct sockaddr_in6 *);
118 static void im6f_purge(struct in6_mfilter *);
119 static void im6f_rollback(struct in6_mfilter *);
120 static void im6f_reap(struct in6_mfilter *);
121 static int im6o_grow(struct ip6_moptions *);
122 static size_t im6o_match_group(const struct ip6_moptions *,
123 const struct ifnet *, const struct sockaddr *);
124 static struct in6_msource *
125 im6o_match_source(const struct ip6_moptions *, const size_t,
126 const struct sockaddr *);
127 static void im6s_merge(struct ip6_msource *ims,
128 const struct in6_msource *lims, const int rollback);
129 static int in6_mc_get(struct ifnet *, const struct in6_addr *,
130 struct in6_multi **);
131 static int in6m_get_source(struct in6_multi *inm,
132 const struct in6_addr *addr, const int noalloc,
133 struct ip6_msource **pims);
134 static int in6m_is_ifp_detached(const struct in6_multi *);
135 static int in6m_merge(struct in6_multi *, /*const*/ struct in6_mfilter *);
136 static void in6m_purge(struct in6_multi *);
137 static void in6m_reap(struct in6_multi *);
138 static struct ip6_moptions *
139 in6p_findmoptions(struct inpcb *);
140 static int in6p_get_source_filters(struct inpcb *, struct sockopt *);
141 static int in6p_join_group(struct inpcb *, struct sockopt *);
142 static int in6p_leave_group(struct inpcb *, struct sockopt *);
143 static struct ifnet *
144 in6p_lookup_mcast_ifp(const struct inpcb *,
145 const struct sockaddr_in6 *);
146 static int in6p_block_unblock_source(struct inpcb *, struct sockopt *);
147 static int in6p_set_multicast_if(struct inpcb *, struct sockopt *);
148 static int in6p_set_source_filters(struct inpcb *, struct sockopt *);
149 static int sysctl_ip6_mcast_filters(SYSCTL_HANDLER_ARGS);
150
151 SYSCTL_DECL(_net_inet6_ip6); /* XXX Not in any common header. */
152
153 static SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, mcast, CTLFLAG_RW, 0,
154 "IPv6 multicast");
155
156 static u_long in6_mcast_maxgrpsrc = IPV6_MAX_GROUP_SRC_FILTER;
157 SYSCTL_ULONG(_net_inet6_ip6_mcast, OID_AUTO, maxgrpsrc,
158 CTLFLAG_RW | CTLFLAG_TUN, &in6_mcast_maxgrpsrc, 0,
159 "Max source filters per group");
160 TUNABLE_ULONG("net.inet6.ip6.mcast.maxgrpsrc", &in6_mcast_maxgrpsrc);
161
162 static u_long in6_mcast_maxsocksrc = IPV6_MAX_SOCK_SRC_FILTER;
163 SYSCTL_ULONG(_net_inet6_ip6_mcast, OID_AUTO, maxsocksrc,
164 CTLFLAG_RW | CTLFLAG_TUN, &in6_mcast_maxsocksrc, 0,
165 "Max source filters per socket");
166 TUNABLE_ULONG("net.inet6.ip6.mcast.maxsocksrc", &in6_mcast_maxsocksrc);
167
168 /* TODO Virtualize this switch. */
169 int in6_mcast_loop = IPV6_DEFAULT_MULTICAST_LOOP;
170 SYSCTL_INT(_net_inet6_ip6_mcast, OID_AUTO, loop, CTLFLAG_RW | CTLFLAG_TUN,
171 &in6_mcast_loop, 0, "Loopback multicast datagrams by default");
172 TUNABLE_INT("net.inet6.ip6.mcast.loop", &in6_mcast_loop);
173
174 static SYSCTL_NODE(_net_inet6_ip6_mcast, OID_AUTO, filters,
175 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ip6_mcast_filters,
176 "Per-interface stack-wide source filters");
177
178 /*
179 * Inline function which wraps assertions for a valid ifp.
180 * The ifnet layer will set the ifma's ifp pointer to NULL if the ifp
181 * is detached.
182 */
183 static int __inline
184 in6m_is_ifp_detached(const struct in6_multi *inm)
185 {
186 struct ifnet *ifp;
187
188 KASSERT(inm->in6m_ifma != NULL, ("%s: no ifma", __func__));
189 ifp = inm->in6m_ifma->ifma_ifp;
190 if (ifp != NULL) {
191 /*
192 * Sanity check that network-layer notion of ifp is the
193 * same as that of link-layer.
194 */
195 KASSERT(inm->in6m_ifp == ifp, ("%s: bad ifp", __func__));
196 }
197
198 return (ifp == NULL);
199 }
200
201 /*
202 * Initialize an in6_mfilter structure to a known state at t0, t1
203 * with an empty source filter list.
204 */
205 static __inline void
206 im6f_init(struct in6_mfilter *imf, const int st0, const int st1)
207 {
208 memset(imf, 0, sizeof(struct in6_mfilter));
209 RB_INIT(&imf->im6f_sources);
210 imf->im6f_st[0] = st0;
211 imf->im6f_st[1] = st1;
212 }
213
214 /*
215 * Resize the ip6_moptions vector to the next power-of-two minus 1.
216 * May be called with locks held; do not sleep.
217 */
218 static int
219 im6o_grow(struct ip6_moptions *imo)
220 {
221 struct in6_multi **nmships;
222 struct in6_multi **omships;
223 struct in6_mfilter *nmfilters;
224 struct in6_mfilter *omfilters;
225 size_t idx;
226 size_t newmax;
227 size_t oldmax;
228
229 nmships = NULL;
230 nmfilters = NULL;
231 omships = imo->im6o_membership;
232 omfilters = imo->im6o_mfilters;
233 oldmax = imo->im6o_max_memberships;
234 newmax = ((oldmax + 1) * 2) - 1;
235
236 if (newmax <= IPV6_MAX_MEMBERSHIPS) {
237 nmships = (struct in6_multi **)realloc(omships,
238 sizeof(struct in6_multi *) * newmax, M_IP6MOPTS, M_NOWAIT);
239 nmfilters = (struct in6_mfilter *)realloc(omfilters,
240 sizeof(struct in6_mfilter) * newmax, M_IN6MFILTER,
241 M_NOWAIT);
242 if (nmships != NULL && nmfilters != NULL) {
243 /* Initialize newly allocated source filter heads. */
244 for (idx = oldmax; idx < newmax; idx++) {
245 im6f_init(&nmfilters[idx], MCAST_UNDEFINED,
246 MCAST_EXCLUDE);
247 }
248 imo->im6o_max_memberships = newmax;
249 imo->im6o_membership = nmships;
250 imo->im6o_mfilters = nmfilters;
251 }
252 }
253
254 if (nmships == NULL || nmfilters == NULL) {
255 if (nmships != NULL)
256 free(nmships, M_IP6MOPTS);
257 if (nmfilters != NULL)
258 free(nmfilters, M_IN6MFILTER);
259 return (ETOOMANYREFS);
260 }
261
262 return (0);
263 }
264
265 /*
266 * Find an IPv6 multicast group entry for this ip6_moptions instance
267 * which matches the specified group, and optionally an interface.
268 * Return its index into the array, or -1 if not found.
269 */
270 static size_t
271 im6o_match_group(const struct ip6_moptions *imo, const struct ifnet *ifp,
272 const struct sockaddr *group)
273 {
274 const struct sockaddr_in6 *gsin6;
275 struct in6_multi **pinm;
276 int idx;
277 int nmships;
278
279 gsin6 = (const struct sockaddr_in6 *)group;
280
281 /* The im6o_membership array may be lazy allocated. */
282 if (imo->im6o_membership == NULL || imo->im6o_num_memberships == 0)
283 return (-1);
284
285 nmships = imo->im6o_num_memberships;
286 pinm = &imo->im6o_membership[0];
287 for (idx = 0; idx < nmships; idx++, pinm++) {
288 if (*pinm == NULL)
289 continue;
290 if ((ifp == NULL || ((*pinm)->in6m_ifp == ifp)) &&
291 IN6_ARE_ADDR_EQUAL(&(*pinm)->in6m_addr,
292 &gsin6->sin6_addr)) {
293 break;
294 }
295 }
296 if (idx >= nmships)
297 idx = -1;
298
299 return (idx);
300 }
301
302 /*
303 * Find an IPv6 multicast source entry for this imo which matches
304 * the given group index for this socket, and source address.
305 *
306 * XXX TODO: The scope ID, if present in src, is stripped before
307 * any comparison. We SHOULD enforce scope/zone checks where the source
308 * filter entry has a link scope.
309 *
310 * NOTE: This does not check if the entry is in-mode, merely if
311 * it exists, which may not be the desired behaviour.
312 */
313 static struct in6_msource *
314 im6o_match_source(const struct ip6_moptions *imo, const size_t gidx,
315 const struct sockaddr *src)
316 {
317 struct ip6_msource find;
318 struct in6_mfilter *imf;
319 struct ip6_msource *ims;
320 const sockunion_t *psa;
321
322 KASSERT(src->sa_family == AF_INET6, ("%s: !AF_INET6", __func__));
323 KASSERT(gidx != -1 && gidx < imo->im6o_num_memberships,
324 ("%s: invalid index %d\n", __func__, (int)gidx));
325
326 /* The im6o_mfilters array may be lazy allocated. */
327 if (imo->im6o_mfilters == NULL)
328 return (NULL);
329 imf = &imo->im6o_mfilters[gidx];
330
331 psa = (const sockunion_t *)src;
332 find.im6s_addr = psa->sin6.sin6_addr;
333 in6_clearscope(&find.im6s_addr); /* XXX */
334 ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
335
336 return ((struct in6_msource *)ims);
337 }
338
339 /*
340 * Perform filtering for multicast datagrams on a socket by group and source.
341 *
342 * Returns 0 if a datagram should be allowed through, or various error codes
343 * if the socket was not a member of the group, or the source was muted, etc.
344 */
345 int
346 im6o_mc_filter(const struct ip6_moptions *imo, const struct ifnet *ifp,
347 const struct sockaddr *group, const struct sockaddr *src)
348 {
349 size_t gidx;
350 struct in6_msource *ims;
351 int mode;
352
353 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
354
355 gidx = im6o_match_group(imo, ifp, group);
356 if (gidx == -1)
357 return (MCAST_NOTGMEMBER);
358
359 /*
360 * Check if the source was included in an (S,G) join.
361 * Allow reception on exclusive memberships by default,
362 * reject reception on inclusive memberships by default.
363 * Exclude source only if an in-mode exclude filter exists.
364 * Include source only if an in-mode include filter exists.
365 * NOTE: We are comparing group state here at MLD t1 (now)
366 * with socket-layer t0 (since last downcall).
367 */
368 mode = imo->im6o_mfilters[gidx].im6f_st[1];
369 ims = im6o_match_source(imo, gidx, src);
370
371 if ((ims == NULL && mode == MCAST_INCLUDE) ||
372 (ims != NULL && ims->im6sl_st[0] != mode))
373 return (MCAST_NOTSMEMBER);
374
375 return (MCAST_PASS);
376 }
377
378 /*
379 * Find and return a reference to an in6_multi record for (ifp, group),
380 * and bump its reference count.
381 * If one does not exist, try to allocate it, and update link-layer multicast
382 * filters on ifp to listen for group.
383 * Assumes the IN6_MULTI lock is held across the call.
384 * Return 0 if successful, otherwise return an appropriate error code.
385 */
386 static int
387 in6_mc_get(struct ifnet *ifp, const struct in6_addr *group,
388 struct in6_multi **pinm)
389 {
390 struct sockaddr_in6 gsin6;
391 struct ifmultiaddr *ifma;
392 struct in6_multi *inm;
393 int error;
394
395 error = 0;
396
397 /*
398 * XXX: Accesses to ifma_protospec must be covered by IF_ADDR_LOCK;
399 * if_addmulti() takes this mutex itself, so we must drop and
400 * re-acquire around the call.
401 */
402 IN6_MULTI_LOCK_ASSERT();
403 IF_ADDR_WLOCK(ifp);
404
405 inm = in6m_lookup_locked(ifp, group);
406 if (inm != NULL) {
407 /*
408 * If we already joined this group, just bump the
409 * refcount and return it.
410 */
411 KASSERT(inm->in6m_refcount >= 1,
412 ("%s: bad refcount %d", __func__, inm->in6m_refcount));
413 ++inm->in6m_refcount;
414 *pinm = inm;
415 goto out_locked;
416 }
417
418 memset(&gsin6, 0, sizeof(gsin6));
419 gsin6.sin6_family = AF_INET6;
420 gsin6.sin6_len = sizeof(struct sockaddr_in6);
421 gsin6.sin6_addr = *group;
422
423 /*
424 * Check if a link-layer group is already associated
425 * with this network-layer group on the given ifnet.
426 */
427 IF_ADDR_WUNLOCK(ifp);
428 error = if_addmulti(ifp, (struct sockaddr *)&gsin6, &ifma);
429 if (error != 0)
430 return (error);
431 IF_ADDR_WLOCK(ifp);
432
433 /*
434 * If something other than netinet6 is occupying the link-layer
435 * group, print a meaningful error message and back out of
436 * the allocation.
437 * Otherwise, bump the refcount on the existing network-layer
438 * group association and return it.
439 */
440 if (ifma->ifma_protospec != NULL) {
441 inm = (struct in6_multi *)ifma->ifma_protospec;
442 #ifdef INVARIANTS
443 KASSERT(ifma->ifma_addr != NULL, ("%s: no ifma_addr",
444 __func__));
445 KASSERT(ifma->ifma_addr->sa_family == AF_INET6,
446 ("%s: ifma not AF_INET6", __func__));
447 KASSERT(inm != NULL, ("%s: no ifma_protospec", __func__));
448 if (inm->in6m_ifma != ifma || inm->in6m_ifp != ifp ||
449 !IN6_ARE_ADDR_EQUAL(&inm->in6m_addr, group))
450 panic("%s: ifma %p is inconsistent with %p (%p)",
451 __func__, ifma, inm, group);
452 #endif
453 ++inm->in6m_refcount;
454 *pinm = inm;
455 goto out_locked;
456 }
457
458 IF_ADDR_WLOCK_ASSERT(ifp);
459
460 /*
461 * A new in6_multi record is needed; allocate and initialize it.
462 * We DO NOT perform an MLD join as the in6_ layer may need to
463 * push an initial source list down to MLD to support SSM.
464 *
465 * The initial source filter state is INCLUDE, {} as per the RFC.
466 * Pending state-changes per group are subject to a bounds check.
467 */
468 inm = malloc(sizeof(*inm), M_IP6MADDR, M_NOWAIT | M_ZERO);
469 if (inm == NULL) {
470 if_delmulti_ifma(ifma);
471 error = ENOMEM;
472 goto out_locked;
473 }
474 inm->in6m_addr = *group;
475 inm->in6m_ifp = ifp;
476 inm->in6m_mli = MLD_IFINFO(ifp);
477 inm->in6m_ifma = ifma;
478 inm->in6m_refcount = 1;
479 inm->in6m_state = MLD_NOT_MEMBER;
480 IFQ_SET_MAXLEN(&inm->in6m_scq, MLD_MAX_STATE_CHANGES);
481
482 inm->in6m_st[0].iss_fmode = MCAST_UNDEFINED;
483 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
484 RB_INIT(&inm->in6m_srcs);
485
486 ifma->ifma_protospec = inm;
487 *pinm = inm;
488
489 out_locked:
490 IF_ADDR_WUNLOCK(ifp);
491 return (error);
492 }
493
494 /*
495 * Drop a reference to an in6_multi record.
496 *
497 * If the refcount drops to 0, free the in6_multi record and
498 * delete the underlying link-layer membership.
499 */
500 void
501 in6m_release_locked(struct in6_multi *inm)
502 {
503 struct ifmultiaddr *ifma;
504
505 IN6_MULTI_LOCK_ASSERT();
506
507 CTR2(KTR_MLD, "%s: refcount is %d", __func__, inm->in6m_refcount);
508
509 if (--inm->in6m_refcount > 0) {
510 CTR2(KTR_MLD, "%s: refcount is now %d", __func__,
511 inm->in6m_refcount);
512 return;
513 }
514
515 CTR2(KTR_MLD, "%s: freeing inm %p", __func__, inm);
516
517 ifma = inm->in6m_ifma;
518
519 /* XXX this access is not covered by IF_ADDR_LOCK */
520 CTR2(KTR_MLD, "%s: purging ifma %p", __func__, ifma);
521 KASSERT(ifma->ifma_protospec == inm,
522 ("%s: ifma_protospec != inm", __func__));
523 ifma->ifma_protospec = NULL;
524
525 in6m_purge(inm);
526
527 free(inm, M_IP6MADDR);
528
529 if_delmulti_ifma(ifma);
530 }
531
532 /*
533 * Clear recorded source entries for a group.
534 * Used by the MLD code. Caller must hold the IN6_MULTI lock.
535 * FIXME: Should reap.
536 */
537 void
538 in6m_clear_recorded(struct in6_multi *inm)
539 {
540 struct ip6_msource *ims;
541
542 IN6_MULTI_LOCK_ASSERT();
543
544 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
545 if (ims->im6s_stp) {
546 ims->im6s_stp = 0;
547 --inm->in6m_st[1].iss_rec;
548 }
549 }
550 KASSERT(inm->in6m_st[1].iss_rec == 0,
551 ("%s: iss_rec %d not 0", __func__, inm->in6m_st[1].iss_rec));
552 }
553
554 /*
555 * Record a source as pending for a Source-Group MLDv2 query.
556 * This lives here as it modifies the shared tree.
557 *
558 * inm is the group descriptor.
559 * naddr is the address of the source to record in network-byte order.
560 *
561 * If the net.inet6.mld.sgalloc sysctl is non-zero, we will
562 * lazy-allocate a source node in response to an SG query.
563 * Otherwise, no allocation is performed. This saves some memory
564 * with the trade-off that the source will not be reported to the
565 * router if joined in the window between the query response and
566 * the group actually being joined on the local host.
567 *
568 * VIMAGE: XXX: Currently the mld_sgalloc feature has been removed.
569 * This turns off the allocation of a recorded source entry if
570 * the group has not been joined.
571 *
572 * Return 0 if the source didn't exist or was already marked as recorded.
573 * Return 1 if the source was marked as recorded by this function.
574 * Return <0 if any error occured (negated errno code).
575 */
576 int
577 in6m_record_source(struct in6_multi *inm, const struct in6_addr *addr)
578 {
579 struct ip6_msource find;
580 struct ip6_msource *ims, *nims;
581
582 IN6_MULTI_LOCK_ASSERT();
583
584 find.im6s_addr = *addr;
585 ims = RB_FIND(ip6_msource_tree, &inm->in6m_srcs, &find);
586 if (ims && ims->im6s_stp)
587 return (0);
588 if (ims == NULL) {
589 if (inm->in6m_nsrc == in6_mcast_maxgrpsrc)
590 return (-ENOSPC);
591 nims = malloc(sizeof(struct ip6_msource), M_IP6MSOURCE,
592 M_NOWAIT | M_ZERO);
593 if (nims == NULL)
594 return (-ENOMEM);
595 nims->im6s_addr = find.im6s_addr;
596 RB_INSERT(ip6_msource_tree, &inm->in6m_srcs, nims);
597 ++inm->in6m_nsrc;
598 ims = nims;
599 }
600
601 /*
602 * Mark the source as recorded and update the recorded
603 * source count.
604 */
605 ++ims->im6s_stp;
606 ++inm->in6m_st[1].iss_rec;
607
608 return (1);
609 }
610
611 /*
612 * Return a pointer to an in6_msource owned by an in6_mfilter,
613 * given its source address.
614 * Lazy-allocate if needed. If this is a new entry its filter state is
615 * undefined at t0.
616 *
617 * imf is the filter set being modified.
618 * addr is the source address.
619 *
620 * SMPng: May be called with locks held; malloc must not block.
621 */
622 static int
623 im6f_get_source(struct in6_mfilter *imf, const struct sockaddr_in6 *psin,
624 struct in6_msource **plims)
625 {
626 struct ip6_msource find;
627 struct ip6_msource *ims, *nims;
628 struct in6_msource *lims;
629 int error;
630
631 error = 0;
632 ims = NULL;
633 lims = NULL;
634
635 find.im6s_addr = psin->sin6_addr;
636 ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
637 lims = (struct in6_msource *)ims;
638 if (lims == NULL) {
639 if (imf->im6f_nsrc == in6_mcast_maxsocksrc)
640 return (ENOSPC);
641 nims = malloc(sizeof(struct in6_msource), M_IN6MFILTER,
642 M_NOWAIT | M_ZERO);
643 if (nims == NULL)
644 return (ENOMEM);
645 lims = (struct in6_msource *)nims;
646 lims->im6s_addr = find.im6s_addr;
647 lims->im6sl_st[0] = MCAST_UNDEFINED;
648 RB_INSERT(ip6_msource_tree, &imf->im6f_sources, nims);
649 ++imf->im6f_nsrc;
650 }
651
652 *plims = lims;
653
654 return (error);
655 }
656
657 /*
658 * Graft a source entry into an existing socket-layer filter set,
659 * maintaining any required invariants and checking allocations.
660 *
661 * The source is marked as being in the new filter mode at t1.
662 *
663 * Return the pointer to the new node, otherwise return NULL.
664 */
665 static struct in6_msource *
666 im6f_graft(struct in6_mfilter *imf, const uint8_t st1,
667 const struct sockaddr_in6 *psin)
668 {
669 struct ip6_msource *nims;
670 struct in6_msource *lims;
671
672 nims = malloc(sizeof(struct in6_msource), M_IN6MFILTER,
673 M_NOWAIT | M_ZERO);
674 if (nims == NULL)
675 return (NULL);
676 lims = (struct in6_msource *)nims;
677 lims->im6s_addr = psin->sin6_addr;
678 lims->im6sl_st[0] = MCAST_UNDEFINED;
679 lims->im6sl_st[1] = st1;
680 RB_INSERT(ip6_msource_tree, &imf->im6f_sources, nims);
681 ++imf->im6f_nsrc;
682
683 return (lims);
684 }
685
686 /*
687 * Prune a source entry from an existing socket-layer filter set,
688 * maintaining any required invariants and checking allocations.
689 *
690 * The source is marked as being left at t1, it is not freed.
691 *
692 * Return 0 if no error occurred, otherwise return an errno value.
693 */
694 static int
695 im6f_prune(struct in6_mfilter *imf, const struct sockaddr_in6 *psin)
696 {
697 struct ip6_msource find;
698 struct ip6_msource *ims;
699 struct in6_msource *lims;
700
701 find.im6s_addr = psin->sin6_addr;
702 ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
703 if (ims == NULL)
704 return (ENOENT);
705 lims = (struct in6_msource *)ims;
706 lims->im6sl_st[1] = MCAST_UNDEFINED;
707 return (0);
708 }
709
710 /*
711 * Revert socket-layer filter set deltas at t1 to t0 state.
712 */
713 static void
714 im6f_rollback(struct in6_mfilter *imf)
715 {
716 struct ip6_msource *ims, *tims;
717 struct in6_msource *lims;
718
719 RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
720 lims = (struct in6_msource *)ims;
721 if (lims->im6sl_st[0] == lims->im6sl_st[1]) {
722 /* no change at t1 */
723 continue;
724 } else if (lims->im6sl_st[0] != MCAST_UNDEFINED) {
725 /* revert change to existing source at t1 */
726 lims->im6sl_st[1] = lims->im6sl_st[0];
727 } else {
728 /* revert source added t1 */
729 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
730 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
731 free(ims, M_IN6MFILTER);
732 imf->im6f_nsrc--;
733 }
734 }
735 imf->im6f_st[1] = imf->im6f_st[0];
736 }
737
738 /*
739 * Mark socket-layer filter set as INCLUDE {} at t1.
740 */
741 static void
742 im6f_leave(struct in6_mfilter *imf)
743 {
744 struct ip6_msource *ims;
745 struct in6_msource *lims;
746
747 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
748 lims = (struct in6_msource *)ims;
749 lims->im6sl_st[1] = MCAST_UNDEFINED;
750 }
751 imf->im6f_st[1] = MCAST_INCLUDE;
752 }
753
754 /*
755 * Mark socket-layer filter set deltas as committed.
756 */
757 static void
758 im6f_commit(struct in6_mfilter *imf)
759 {
760 struct ip6_msource *ims;
761 struct in6_msource *lims;
762
763 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
764 lims = (struct in6_msource *)ims;
765 lims->im6sl_st[0] = lims->im6sl_st[1];
766 }
767 imf->im6f_st[0] = imf->im6f_st[1];
768 }
769
770 /*
771 * Reap unreferenced sources from socket-layer filter set.
772 */
773 static void
774 im6f_reap(struct in6_mfilter *imf)
775 {
776 struct ip6_msource *ims, *tims;
777 struct in6_msource *lims;
778
779 RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
780 lims = (struct in6_msource *)ims;
781 if ((lims->im6sl_st[0] == MCAST_UNDEFINED) &&
782 (lims->im6sl_st[1] == MCAST_UNDEFINED)) {
783 CTR2(KTR_MLD, "%s: free lims %p", __func__, ims);
784 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
785 free(ims, M_IN6MFILTER);
786 imf->im6f_nsrc--;
787 }
788 }
789 }
790
791 /*
792 * Purge socket-layer filter set.
793 */
794 static void
795 im6f_purge(struct in6_mfilter *imf)
796 {
797 struct ip6_msource *ims, *tims;
798
799 RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
800 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
801 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
802 free(ims, M_IN6MFILTER);
803 imf->im6f_nsrc--;
804 }
805 imf->im6f_st[0] = imf->im6f_st[1] = MCAST_UNDEFINED;
806 KASSERT(RB_EMPTY(&imf->im6f_sources),
807 ("%s: im6f_sources not empty", __func__));
808 }
809
810 /*
811 * Look up a source filter entry for a multicast group.
812 *
813 * inm is the group descriptor to work with.
814 * addr is the IPv6 address to look up.
815 * noalloc may be non-zero to suppress allocation of sources.
816 * *pims will be set to the address of the retrieved or allocated source.
817 *
818 * SMPng: NOTE: may be called with locks held.
819 * Return 0 if successful, otherwise return a non-zero error code.
820 */
821 static int
822 in6m_get_source(struct in6_multi *inm, const struct in6_addr *addr,
823 const int noalloc, struct ip6_msource **pims)
824 {
825 struct ip6_msource find;
826 struct ip6_msource *ims, *nims;
827 #ifdef KTR
828 char ip6tbuf[INET6_ADDRSTRLEN];
829 #endif
830
831 find.im6s_addr = *addr;
832 ims = RB_FIND(ip6_msource_tree, &inm->in6m_srcs, &find);
833 if (ims == NULL && !noalloc) {
834 if (inm->in6m_nsrc == in6_mcast_maxgrpsrc)
835 return (ENOSPC);
836 nims = malloc(sizeof(struct ip6_msource), M_IP6MSOURCE,
837 M_NOWAIT | M_ZERO);
838 if (nims == NULL)
839 return (ENOMEM);
840 nims->im6s_addr = *addr;
841 RB_INSERT(ip6_msource_tree, &inm->in6m_srcs, nims);
842 ++inm->in6m_nsrc;
843 ims = nims;
844 CTR3(KTR_MLD, "%s: allocated %s as %p", __func__,
845 ip6_sprintf(ip6tbuf, addr), ims);
846 }
847
848 *pims = ims;
849 return (0);
850 }
851
852 /*
853 * Merge socket-layer source into MLD-layer source.
854 * If rollback is non-zero, perform the inverse of the merge.
855 */
856 static void
857 im6s_merge(struct ip6_msource *ims, const struct in6_msource *lims,
858 const int rollback)
859 {
860 int n = rollback ? -1 : 1;
861 #ifdef KTR
862 char ip6tbuf[INET6_ADDRSTRLEN];
863
864 ip6_sprintf(ip6tbuf, &lims->im6s_addr);
865 #endif
866
867 if (lims->im6sl_st[0] == MCAST_EXCLUDE) {
868 CTR3(KTR_MLD, "%s: t1 ex -= %d on %s", __func__, n, ip6tbuf);
869 ims->im6s_st[1].ex -= n;
870 } else if (lims->im6sl_st[0] == MCAST_INCLUDE) {
871 CTR3(KTR_MLD, "%s: t1 in -= %d on %s", __func__, n, ip6tbuf);
872 ims->im6s_st[1].in -= n;
873 }
874
875 if (lims->im6sl_st[1] == MCAST_EXCLUDE) {
876 CTR3(KTR_MLD, "%s: t1 ex += %d on %s", __func__, n, ip6tbuf);
877 ims->im6s_st[1].ex += n;
878 } else if (lims->im6sl_st[1] == MCAST_INCLUDE) {
879 CTR3(KTR_MLD, "%s: t1 in += %d on %s", __func__, n, ip6tbuf);
880 ims->im6s_st[1].in += n;
881 }
882 }
883
884 /*
885 * Atomically update the global in6_multi state, when a membership's
886 * filter list is being updated in any way.
887 *
888 * imf is the per-inpcb-membership group filter pointer.
889 * A fake imf may be passed for in-kernel consumers.
890 *
891 * XXX This is a candidate for a set-symmetric-difference style loop
892 * which would eliminate the repeated lookup from root of ims nodes,
893 * as they share the same key space.
894 *
895 * If any error occurred this function will back out of refcounts
896 * and return a non-zero value.
897 */
898 static int
899 in6m_merge(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
900 {
901 struct ip6_msource *ims, *nims;
902 struct in6_msource *lims;
903 int schanged, error;
904 int nsrc0, nsrc1;
905
906 schanged = 0;
907 error = 0;
908 nsrc1 = nsrc0 = 0;
909
910 /*
911 * Update the source filters first, as this may fail.
912 * Maintain count of in-mode filters at t0, t1. These are
913 * used to work out if we transition into ASM mode or not.
914 * Maintain a count of source filters whose state was
915 * actually modified by this operation.
916 */
917 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
918 lims = (struct in6_msource *)ims;
919 if (lims->im6sl_st[0] == imf->im6f_st[0]) nsrc0++;
920 if (lims->im6sl_st[1] == imf->im6f_st[1]) nsrc1++;
921 if (lims->im6sl_st[0] == lims->im6sl_st[1]) continue;
922 error = in6m_get_source(inm, &lims->im6s_addr, 0, &nims);
923 ++schanged;
924 if (error)
925 break;
926 im6s_merge(nims, lims, 0);
927 }
928 if (error) {
929 struct ip6_msource *bims;
930
931 RB_FOREACH_REVERSE_FROM(ims, ip6_msource_tree, nims) {
932 lims = (struct in6_msource *)ims;
933 if (lims->im6sl_st[0] == lims->im6sl_st[1])
934 continue;
935 (void)in6m_get_source(inm, &lims->im6s_addr, 1, &bims);
936 if (bims == NULL)
937 continue;
938 im6s_merge(bims, lims, 1);
939 }
940 goto out_reap;
941 }
942
943 CTR3(KTR_MLD, "%s: imf filters in-mode: %d at t0, %d at t1",
944 __func__, nsrc0, nsrc1);
945
946 /* Handle transition between INCLUDE {n} and INCLUDE {} on socket. */
947 if (imf->im6f_st[0] == imf->im6f_st[1] &&
948 imf->im6f_st[1] == MCAST_INCLUDE) {
949 if (nsrc1 == 0) {
950 CTR1(KTR_MLD, "%s: --in on inm at t1", __func__);
951 --inm->in6m_st[1].iss_in;
952 }
953 }
954
955 /* Handle filter mode transition on socket. */
956 if (imf->im6f_st[0] != imf->im6f_st[1]) {
957 CTR3(KTR_MLD, "%s: imf transition %d to %d",
958 __func__, imf->im6f_st[0], imf->im6f_st[1]);
959
960 if (imf->im6f_st[0] == MCAST_EXCLUDE) {
961 CTR1(KTR_MLD, "%s: --ex on inm at t1", __func__);
962 --inm->in6m_st[1].iss_ex;
963 } else if (imf->im6f_st[0] == MCAST_INCLUDE) {
964 CTR1(KTR_MLD, "%s: --in on inm at t1", __func__);
965 --inm->in6m_st[1].iss_in;
966 }
967
968 if (imf->im6f_st[1] == MCAST_EXCLUDE) {
969 CTR1(KTR_MLD, "%s: ex++ on inm at t1", __func__);
970 inm->in6m_st[1].iss_ex++;
971 } else if (imf->im6f_st[1] == MCAST_INCLUDE && nsrc1 > 0) {
972 CTR1(KTR_MLD, "%s: in++ on inm at t1", __func__);
973 inm->in6m_st[1].iss_in++;
974 }
975 }
976
977 /*
978 * Track inm filter state in terms of listener counts.
979 * If there are any exclusive listeners, stack-wide
980 * membership is exclusive.
981 * Otherwise, if only inclusive listeners, stack-wide is inclusive.
982 * If no listeners remain, state is undefined at t1,
983 * and the MLD lifecycle for this group should finish.
984 */
985 if (inm->in6m_st[1].iss_ex > 0) {
986 CTR1(KTR_MLD, "%s: transition to EX", __func__);
987 inm->in6m_st[1].iss_fmode = MCAST_EXCLUDE;
988 } else if (inm->in6m_st[1].iss_in > 0) {
989 CTR1(KTR_MLD, "%s: transition to IN", __func__);
990 inm->in6m_st[1].iss_fmode = MCAST_INCLUDE;
991 } else {
992 CTR1(KTR_MLD, "%s: transition to UNDEF", __func__);
993 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
994 }
995
996 /* Decrement ASM listener count on transition out of ASM mode. */
997 if (imf->im6f_st[0] == MCAST_EXCLUDE && nsrc0 == 0) {
998 if ((imf->im6f_st[1] != MCAST_EXCLUDE) ||
999 (imf->im6f_st[1] == MCAST_EXCLUDE && nsrc1 > 0))
1000 CTR1(KTR_MLD, "%s: --asm on inm at t1", __func__);
1001 --inm->in6m_st[1].iss_asm;
1002 }
1003
1004 /* Increment ASM listener count on transition to ASM mode. */
1005 if (imf->im6f_st[1] == MCAST_EXCLUDE && nsrc1 == 0) {
1006 CTR1(KTR_MLD, "%s: asm++ on inm at t1", __func__);
1007 inm->in6m_st[1].iss_asm++;
1008 }
1009
1010 CTR3(KTR_MLD, "%s: merged imf %p to inm %p", __func__, imf, inm);
1011 in6m_print(inm);
1012
1013 out_reap:
1014 if (schanged > 0) {
1015 CTR1(KTR_MLD, "%s: sources changed; reaping", __func__);
1016 in6m_reap(inm);
1017 }
1018 return (error);
1019 }
1020
1021 /*
1022 * Mark an in6_multi's filter set deltas as committed.
1023 * Called by MLD after a state change has been enqueued.
1024 */
1025 void
1026 in6m_commit(struct in6_multi *inm)
1027 {
1028 struct ip6_msource *ims;
1029
1030 CTR2(KTR_MLD, "%s: commit inm %p", __func__, inm);
1031 CTR1(KTR_MLD, "%s: pre commit:", __func__);
1032 in6m_print(inm);
1033
1034 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
1035 ims->im6s_st[0] = ims->im6s_st[1];
1036 }
1037 inm->in6m_st[0] = inm->in6m_st[1];
1038 }
1039
1040 /*
1041 * Reap unreferenced nodes from an in6_multi's filter set.
1042 */
1043 static void
1044 in6m_reap(struct in6_multi *inm)
1045 {
1046 struct ip6_msource *ims, *tims;
1047
1048 RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs, tims) {
1049 if (ims->im6s_st[0].ex > 0 || ims->im6s_st[0].in > 0 ||
1050 ims->im6s_st[1].ex > 0 || ims->im6s_st[1].in > 0 ||
1051 ims->im6s_stp != 0)
1052 continue;
1053 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
1054 RB_REMOVE(ip6_msource_tree, &inm->in6m_srcs, ims);
1055 free(ims, M_IP6MSOURCE);
1056 inm->in6m_nsrc--;
1057 }
1058 }
1059
1060 /*
1061 * Purge all source nodes from an in6_multi's filter set.
1062 */
1063 static void
1064 in6m_purge(struct in6_multi *inm)
1065 {
1066 struct ip6_msource *ims, *tims;
1067
1068 RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs, tims) {
1069 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
1070 RB_REMOVE(ip6_msource_tree, &inm->in6m_srcs, ims);
1071 free(ims, M_IP6MSOURCE);
1072 inm->in6m_nsrc--;
1073 }
1074 }
1075
1076 /*
1077 * Join a multicast address w/o sources.
1078 * KAME compatibility entry point.
1079 *
1080 * SMPng: Assume no mc locks held by caller.
1081 */
1082 struct in6_multi_mship *
1083 in6_joingroup(struct ifnet *ifp, struct in6_addr *mcaddr,
1084 int *errorp, int delay)
1085 {
1086 struct in6_multi_mship *imm;
1087 int error;
1088
1089 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT);
1090 if (imm == NULL) {
1091 *errorp = ENOBUFS;
1092 return (NULL);
1093 }
1094
1095 delay = (delay * PR_FASTHZ) / hz;
1096
1097 error = in6_mc_join(ifp, mcaddr, NULL, &imm->i6mm_maddr, delay);
1098 if (error) {
1099 *errorp = error;
1100 free(imm, M_IP6MADDR);
1101 return (NULL);
1102 }
1103
1104 return (imm);
1105 }
1106
1107 /*
1108 * Leave a multicast address w/o sources.
1109 * KAME compatibility entry point.
1110 *
1111 * SMPng: Assume no mc locks held by caller.
1112 */
1113 int
1114 in6_leavegroup(struct in6_multi_mship *imm)
1115 {
1116
1117 if (imm->i6mm_maddr != NULL)
1118 in6_mc_leave(imm->i6mm_maddr, NULL);
1119 free(imm, M_IP6MADDR);
1120 return 0;
1121 }
1122
1123 /*
1124 * Join a multicast group; unlocked entry point.
1125 *
1126 * SMPng: XXX: in6_mc_join() is called from in6_control() when upper
1127 * locks are not held. Fortunately, ifp is unlikely to have been detached
1128 * at this point, so we assume it's OK to recurse.
1129 */
1130 int
1131 in6_mc_join(struct ifnet *ifp, const struct in6_addr *mcaddr,
1132 /*const*/ struct in6_mfilter *imf, struct in6_multi **pinm,
1133 const int delay)
1134 {
1135 int error;
1136
1137 IN6_MULTI_LOCK();
1138 error = in6_mc_join_locked(ifp, mcaddr, imf, pinm, delay);
1139 IN6_MULTI_UNLOCK();
1140
1141 return (error);
1142 }
1143
1144 /*
1145 * Join a multicast group; real entry point.
1146 *
1147 * Only preserves atomicity at inm level.
1148 * NOTE: imf argument cannot be const due to sys/tree.h limitations.
1149 *
1150 * If the MLD downcall fails, the group is not joined, and an error
1151 * code is returned.
1152 */
1153 int
1154 in6_mc_join_locked(struct ifnet *ifp, const struct in6_addr *mcaddr,
1155 /*const*/ struct in6_mfilter *imf, struct in6_multi **pinm,
1156 const int delay)
1157 {
1158 struct in6_mfilter timf;
1159 struct in6_multi *inm;
1160 int error;
1161 #ifdef KTR
1162 char ip6tbuf[INET6_ADDRSTRLEN];
1163 #endif
1164
1165 #ifdef INVARIANTS
1166 /*
1167 * Sanity: Check scope zone ID was set for ifp, if and
1168 * only if group is scoped to an interface.
1169 */
1170 KASSERT(IN6_IS_ADDR_MULTICAST(mcaddr),
1171 ("%s: not a multicast address", __func__));
1172 if (IN6_IS_ADDR_MC_LINKLOCAL(mcaddr) ||
1173 IN6_IS_ADDR_MC_INTFACELOCAL(mcaddr)) {
1174 KASSERT(mcaddr->s6_addr16[1] != 0,
1175 ("%s: scope zone ID not set", __func__));
1176 }
1177 #endif
1178
1179 IN6_MULTI_LOCK_ASSERT();
1180
1181 CTR4(KTR_MLD, "%s: join %s on %p(%s))", __func__,
1182 ip6_sprintf(ip6tbuf, mcaddr), ifp, ifp->if_xname);
1183
1184 error = 0;
1185 inm = NULL;
1186
1187 /*
1188 * If no imf was specified (i.e. kernel consumer),
1189 * fake one up and assume it is an ASM join.
1190 */
1191 if (imf == NULL) {
1192 im6f_init(&timf, MCAST_UNDEFINED, MCAST_EXCLUDE);
1193 imf = &timf;
1194 }
1195
1196 error = in6_mc_get(ifp, mcaddr, &inm);
1197 if (error) {
1198 CTR1(KTR_MLD, "%s: in6_mc_get() failure", __func__);
1199 return (error);
1200 }
1201
1202 CTR1(KTR_MLD, "%s: merge inm state", __func__);
1203 error = in6m_merge(inm, imf);
1204 if (error) {
1205 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
1206 goto out_in6m_release;
1207 }
1208
1209 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
1210 error = mld_change_state(inm, delay);
1211 if (error) {
1212 CTR1(KTR_MLD, "%s: failed to update source", __func__);
1213 goto out_in6m_release;
1214 }
1215
1216 out_in6m_release:
1217 if (error) {
1218 CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
1219 in6m_release_locked(inm);
1220 } else {
1221 *pinm = inm;
1222 }
1223
1224 return (error);
1225 }
1226
1227 /*
1228 * Leave a multicast group; unlocked entry point.
1229 */
1230 int
1231 in6_mc_leave(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
1232 {
1233 struct ifnet *ifp;
1234 int error;
1235
1236 ifp = inm->in6m_ifp;
1237
1238 IN6_MULTI_LOCK();
1239 error = in6_mc_leave_locked(inm, imf);
1240 IN6_MULTI_UNLOCK();
1241
1242 return (error);
1243 }
1244
1245 /*
1246 * Leave a multicast group; real entry point.
1247 * All source filters will be expunged.
1248 *
1249 * Only preserves atomicity at inm level.
1250 *
1251 * Holding the write lock for the INP which contains imf
1252 * is highly advisable. We can't assert for it as imf does not
1253 * contain a back-pointer to the owning inp.
1254 *
1255 * Note: This is not the same as in6m_release(*) as this function also
1256 * makes a state change downcall into MLD.
1257 */
1258 int
1259 in6_mc_leave_locked(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
1260 {
1261 struct in6_mfilter timf;
1262 int error;
1263 #ifdef KTR
1264 char ip6tbuf[INET6_ADDRSTRLEN];
1265 #endif
1266
1267 error = 0;
1268
1269 IN6_MULTI_LOCK_ASSERT();
1270
1271 CTR5(KTR_MLD, "%s: leave inm %p, %s/%s, imf %p", __func__,
1272 inm, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
1273 (in6m_is_ifp_detached(inm) ? "null" : inm->in6m_ifp->if_xname),
1274 imf);
1275
1276 /*
1277 * If no imf was specified (i.e. kernel consumer),
1278 * fake one up and assume it is an ASM join.
1279 */
1280 if (imf == NULL) {
1281 im6f_init(&timf, MCAST_EXCLUDE, MCAST_UNDEFINED);
1282 imf = &timf;
1283 }
1284
1285 /*
1286 * Begin state merge transaction at MLD layer.
1287 *
1288 * As this particular invocation should not cause any memory
1289 * to be allocated, and there is no opportunity to roll back
1290 * the transaction, it MUST NOT fail.
1291 */
1292 CTR1(KTR_MLD, "%s: merge inm state", __func__);
1293 error = in6m_merge(inm, imf);
1294 KASSERT(error == 0, ("%s: failed to merge inm state", __func__));
1295
1296 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
1297 error = mld_change_state(inm, 0);
1298 if (error)
1299 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
1300
1301 CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
1302 in6m_release_locked(inm);
1303
1304 return (error);
1305 }
1306
1307 /*
1308 * Block or unblock an ASM multicast source on an inpcb.
1309 * This implements the delta-based API described in RFC 3678.
1310 *
1311 * The delta-based API applies only to exclusive-mode memberships.
1312 * An MLD downcall will be performed.
1313 *
1314 * SMPng: NOTE: Must take Giant as a join may create a new ifma.
1315 *
1316 * Return 0 if successful, otherwise return an appropriate error code.
1317 */
1318 static int
1319 in6p_block_unblock_source(struct inpcb *inp, struct sockopt *sopt)
1320 {
1321 struct group_source_req gsr;
1322 sockunion_t *gsa, *ssa;
1323 struct ifnet *ifp;
1324 struct in6_mfilter *imf;
1325 struct ip6_moptions *imo;
1326 struct in6_msource *ims;
1327 struct in6_multi *inm;
1328 size_t idx;
1329 uint16_t fmode;
1330 int error, doblock;
1331 #ifdef KTR
1332 char ip6tbuf[INET6_ADDRSTRLEN];
1333 #endif
1334
1335 ifp = NULL;
1336 error = 0;
1337 doblock = 0;
1338
1339 memset(&gsr, 0, sizeof(struct group_source_req));
1340 gsa = (sockunion_t *)&gsr.gsr_group;
1341 ssa = (sockunion_t *)&gsr.gsr_source;
1342
1343 switch (sopt->sopt_name) {
1344 case MCAST_BLOCK_SOURCE:
1345 case MCAST_UNBLOCK_SOURCE:
1346 error = sooptcopyin(sopt, &gsr,
1347 sizeof(struct group_source_req),
1348 sizeof(struct group_source_req));
1349 if (error)
1350 return (error);
1351
1352 if (gsa->sin6.sin6_family != AF_INET6 ||
1353 gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1354 return (EINVAL);
1355
1356 if (ssa->sin6.sin6_family != AF_INET6 ||
1357 ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1358 return (EINVAL);
1359
1360 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1361 return (EADDRNOTAVAIL);
1362
1363 ifp = ifnet_byindex(gsr.gsr_interface);
1364
1365 if (sopt->sopt_name == MCAST_BLOCK_SOURCE)
1366 doblock = 1;
1367 break;
1368
1369 default:
1370 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
1371 __func__, sopt->sopt_name);
1372 return (EOPNOTSUPP);
1373 break;
1374 }
1375
1376 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
1377 return (EINVAL);
1378
1379 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
1380
1381 /*
1382 * Check if we are actually a member of this group.
1383 */
1384 imo = in6p_findmoptions(inp);
1385 idx = im6o_match_group(imo, ifp, &gsa->sa);
1386 if (idx == -1 || imo->im6o_mfilters == NULL) {
1387 error = EADDRNOTAVAIL;
1388 goto out_in6p_locked;
1389 }
1390
1391 KASSERT(imo->im6o_mfilters != NULL,
1392 ("%s: im6o_mfilters not allocated", __func__));
1393 imf = &imo->im6o_mfilters[idx];
1394 inm = imo->im6o_membership[idx];
1395
1396 /*
1397 * Attempting to use the delta-based API on an
1398 * non exclusive-mode membership is an error.
1399 */
1400 fmode = imf->im6f_st[0];
1401 if (fmode != MCAST_EXCLUDE) {
1402 error = EINVAL;
1403 goto out_in6p_locked;
1404 }
1405
1406 /*
1407 * Deal with error cases up-front:
1408 * Asked to block, but already blocked; or
1409 * Asked to unblock, but nothing to unblock.
1410 * If adding a new block entry, allocate it.
1411 */
1412 ims = im6o_match_source(imo, idx, &ssa->sa);
1413 if ((ims != NULL && doblock) || (ims == NULL && !doblock)) {
1414 CTR3(KTR_MLD, "%s: source %s %spresent", __func__,
1415 ip6_sprintf(ip6tbuf, &ssa->sin6.sin6_addr),
1416 doblock ? "" : "not ");
1417 error = EADDRNOTAVAIL;
1418 goto out_in6p_locked;
1419 }
1420
1421 INP_WLOCK_ASSERT(inp);
1422
1423 /*
1424 * Begin state merge transaction at socket layer.
1425 */
1426 if (doblock) {
1427 CTR2(KTR_MLD, "%s: %s source", __func__, "block");
1428 ims = im6f_graft(imf, fmode, &ssa->sin6);
1429 if (ims == NULL)
1430 error = ENOMEM;
1431 } else {
1432 CTR2(KTR_MLD, "%s: %s source", __func__, "allow");
1433 error = im6f_prune(imf, &ssa->sin6);
1434 }
1435
1436 if (error) {
1437 CTR1(KTR_MLD, "%s: merge imf state failed", __func__);
1438 goto out_im6f_rollback;
1439 }
1440
1441 /*
1442 * Begin state merge transaction at MLD layer.
1443 */
1444 IN6_MULTI_LOCK();
1445
1446 CTR1(KTR_MLD, "%s: merge inm state", __func__);
1447 error = in6m_merge(inm, imf);
1448 if (error) {
1449 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
1450 goto out_im6f_rollback;
1451 }
1452
1453 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
1454 error = mld_change_state(inm, 0);
1455 if (error)
1456 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
1457
1458 IN6_MULTI_UNLOCK();
1459
1460 out_im6f_rollback:
1461 if (error)
1462 im6f_rollback(imf);
1463 else
1464 im6f_commit(imf);
1465
1466 im6f_reap(imf);
1467
1468 out_in6p_locked:
1469 INP_WUNLOCK(inp);
1470 return (error);
1471 }
1472
1473 /*
1474 * Given an inpcb, return its multicast options structure pointer. Accepts
1475 * an unlocked inpcb pointer, but will return it locked. May sleep.
1476 *
1477 * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
1478 * SMPng: NOTE: Returns with the INP write lock held.
1479 */
1480 static struct ip6_moptions *
1481 in6p_findmoptions(struct inpcb *inp)
1482 {
1483 struct ip6_moptions *imo;
1484 struct in6_multi **immp;
1485 struct in6_mfilter *imfp;
1486 size_t idx;
1487
1488 INP_WLOCK(inp);
1489 if (inp->in6p_moptions != NULL)
1490 return (inp->in6p_moptions);
1491
1492 INP_WUNLOCK(inp);
1493
1494 imo = malloc(sizeof(*imo), M_IP6MOPTS, M_WAITOK);
1495 immp = malloc(sizeof(*immp) * IPV6_MIN_MEMBERSHIPS, M_IP6MOPTS,
1496 M_WAITOK | M_ZERO);
1497 imfp = malloc(sizeof(struct in6_mfilter) * IPV6_MIN_MEMBERSHIPS,
1498 M_IN6MFILTER, M_WAITOK);
1499
1500 imo->im6o_multicast_ifp = NULL;
1501 imo->im6o_multicast_hlim = V_ip6_defmcasthlim;
1502 imo->im6o_multicast_loop = in6_mcast_loop;
1503 imo->im6o_num_memberships = 0;
1504 imo->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS;
1505 imo->im6o_membership = immp;
1506
1507 /* Initialize per-group source filters. */
1508 for (idx = 0; idx < IPV6_MIN_MEMBERSHIPS; idx++)
1509 im6f_init(&imfp[idx], MCAST_UNDEFINED, MCAST_EXCLUDE);
1510 imo->im6o_mfilters = imfp;
1511
1512 INP_WLOCK(inp);
1513 if (inp->in6p_moptions != NULL) {
1514 free(imfp, M_IN6MFILTER);
1515 free(immp, M_IP6MOPTS);
1516 free(imo, M_IP6MOPTS);
1517 return (inp->in6p_moptions);
1518 }
1519 inp->in6p_moptions = imo;
1520 return (imo);
1521 }
1522
1523 /*
1524 * Discard the IPv6 multicast options (and source filters).
1525 *
1526 * SMPng: NOTE: assumes INP write lock is held.
1527 */
1528 void
1529 ip6_freemoptions(struct ip6_moptions *imo)
1530 {
1531 struct in6_mfilter *imf;
1532 size_t idx, nmships;
1533
1534 KASSERT(imo != NULL, ("%s: ip6_moptions is NULL", __func__));
1535
1536 nmships = imo->im6o_num_memberships;
1537 for (idx = 0; idx < nmships; ++idx) {
1538 imf = imo->im6o_mfilters ? &imo->im6o_mfilters[idx] : NULL;
1539 if (imf)
1540 im6f_leave(imf);
1541 /* XXX this will thrash the lock(s) */
1542 (void)in6_mc_leave(imo->im6o_membership[idx], imf);
1543 if (imf)
1544 im6f_purge(imf);
1545 }
1546
1547 if (imo->im6o_mfilters)
1548 free(imo->im6o_mfilters, M_IN6MFILTER);
1549 free(imo->im6o_membership, M_IP6MOPTS);
1550 free(imo, M_IP6MOPTS);
1551 }
1552
1553 /*
1554 * Atomically get source filters on a socket for an IPv6 multicast group.
1555 * Called with INP lock held; returns with lock released.
1556 */
1557 static int
1558 in6p_get_source_filters(struct inpcb *inp, struct sockopt *sopt)
1559 {
1560 struct __msfilterreq msfr;
1561 sockunion_t *gsa;
1562 struct ifnet *ifp;
1563 struct ip6_moptions *imo;
1564 struct in6_mfilter *imf;
1565 struct ip6_msource *ims;
1566 struct in6_msource *lims;
1567 struct sockaddr_in6 *psin;
1568 struct sockaddr_storage *ptss;
1569 struct sockaddr_storage *tss;
1570 int error;
1571 size_t idx, nsrcs, ncsrcs;
1572
1573 INP_WLOCK_ASSERT(inp);
1574
1575 imo = inp->in6p_moptions;
1576 KASSERT(imo != NULL, ("%s: null ip6_moptions", __func__));
1577
1578 INP_WUNLOCK(inp);
1579
1580 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
1581 sizeof(struct __msfilterreq));
1582 if (error)
1583 return (error);
1584
1585 if (msfr.msfr_group.ss_family != AF_INET6 ||
1586 msfr.msfr_group.ss_len != sizeof(struct sockaddr_in6))
1587 return (EINVAL);
1588
1589 gsa = (sockunion_t *)&msfr.msfr_group;
1590 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
1591 return (EINVAL);
1592
1593 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
1594 return (EADDRNOTAVAIL);
1595 ifp = ifnet_byindex(msfr.msfr_ifindex);
1596 if (ifp == NULL)
1597 return (EADDRNOTAVAIL);
1598 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
1599
1600 INP_WLOCK(inp);
1601
1602 /*
1603 * Lookup group on the socket.
1604 */
1605 idx = im6o_match_group(imo, ifp, &gsa->sa);
1606 if (idx == -1 || imo->im6o_mfilters == NULL) {
1607 INP_WUNLOCK(inp);
1608 return (EADDRNOTAVAIL);
1609 }
1610 imf = &imo->im6o_mfilters[idx];
1611
1612 /*
1613 * Ignore memberships which are in limbo.
1614 */
1615 if (imf->im6f_st[1] == MCAST_UNDEFINED) {
1616 INP_WUNLOCK(inp);
1617 return (EAGAIN);
1618 }
1619 msfr.msfr_fmode = imf->im6f_st[1];
1620
1621 /*
1622 * If the user specified a buffer, copy out the source filter
1623 * entries to userland gracefully.
1624 * We only copy out the number of entries which userland
1625 * has asked for, but we always tell userland how big the
1626 * buffer really needs to be.
1627 */
1628 if (msfr.msfr_nsrcs > in6_mcast_maxsocksrc)
1629 msfr.msfr_nsrcs = in6_mcast_maxsocksrc;
1630 tss = NULL;
1631 if (msfr.msfr_srcs != NULL && msfr.msfr_nsrcs > 0) {
1632 tss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
1633 M_TEMP, M_NOWAIT | M_ZERO);
1634 if (tss == NULL) {
1635 INP_WUNLOCK(inp);
1636 return (ENOBUFS);
1637 }
1638 }
1639
1640 /*
1641 * Count number of sources in-mode at t0.
1642 * If buffer space exists and remains, copy out source entries.
1643 */
1644 nsrcs = msfr.msfr_nsrcs;
1645 ncsrcs = 0;
1646 ptss = tss;
1647 RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
1648 lims = (struct in6_msource *)ims;
1649 if (lims->im6sl_st[0] == MCAST_UNDEFINED ||
1650 lims->im6sl_st[0] != imf->im6f_st[0])
1651 continue;
1652 ++ncsrcs;
1653 if (tss != NULL && nsrcs > 0) {
1654 psin = (struct sockaddr_in6 *)ptss;
1655 psin->sin6_family = AF_INET6;
1656 psin->sin6_len = sizeof(struct sockaddr_in6);
1657 psin->sin6_addr = lims->im6s_addr;
1658 psin->sin6_port = 0;
1659 --nsrcs;
1660 ++ptss;
1661 }
1662 }
1663
1664 INP_WUNLOCK(inp);
1665
1666 if (tss != NULL) {
1667 error = copyout(tss, msfr.msfr_srcs,
1668 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
1669 free(tss, M_TEMP);
1670 if (error)
1671 return (error);
1672 }
1673
1674 msfr.msfr_nsrcs = ncsrcs;
1675 error = sooptcopyout(sopt, &msfr, sizeof(struct __msfilterreq));
1676
1677 return (error);
1678 }
1679
1680 /*
1681 * Return the IP multicast options in response to user getsockopt().
1682 */
1683 int
1684 ip6_getmoptions(struct inpcb *inp, struct sockopt *sopt)
1685 {
1686 struct ip6_moptions *im6o;
1687 int error;
1688 u_int optval;
1689
1690 INP_WLOCK(inp);
1691 im6o = inp->in6p_moptions;
1692 /*
1693 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
1694 * or is a divert socket, reject it.
1695 */
1696 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
1697 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
1698 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM)) {
1699 INP_WUNLOCK(inp);
1700 return (EOPNOTSUPP);
1701 }
1702
1703 error = 0;
1704 switch (sopt->sopt_name) {
1705 case IPV6_MULTICAST_IF:
1706 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) {
1707 optval = 0;
1708 } else {
1709 optval = im6o->im6o_multicast_ifp->if_index;
1710 }
1711 INP_WUNLOCK(inp);
1712 error = sooptcopyout(sopt, &optval, sizeof(u_int));
1713 break;
1714
1715 case IPV6_MULTICAST_HOPS:
1716 if (im6o == NULL)
1717 optval = V_ip6_defmcasthlim;
1718 else
1719 optval = im6o->im6o_multicast_hlim;
1720 INP_WUNLOCK(inp);
1721 error = sooptcopyout(sopt, &optval, sizeof(u_int));
1722 break;
1723
1724 case IPV6_MULTICAST_LOOP:
1725 if (im6o == NULL)
1726 optval = in6_mcast_loop; /* XXX VIMAGE */
1727 else
1728 optval = im6o->im6o_multicast_loop;
1729 INP_WUNLOCK(inp);
1730 error = sooptcopyout(sopt, &optval, sizeof(u_int));
1731 break;
1732
1733 case IPV6_MSFILTER:
1734 if (im6o == NULL) {
1735 error = EADDRNOTAVAIL;
1736 INP_WUNLOCK(inp);
1737 } else {
1738 error = in6p_get_source_filters(inp, sopt);
1739 }
1740 break;
1741
1742 default:
1743 INP_WUNLOCK(inp);
1744 error = ENOPROTOOPT;
1745 break;
1746 }
1747
1748 INP_UNLOCK_ASSERT(inp);
1749
1750 return (error);
1751 }
1752
1753 /*
1754 * Look up the ifnet to use for a multicast group membership,
1755 * given the address of an IPv6 group.
1756 *
1757 * This routine exists to support legacy IPv6 multicast applications.
1758 *
1759 * If inp is non-NULL, use this socket's current FIB number for any
1760 * required FIB lookup. Look up the group address in the unicast FIB,
1761 * and use its ifp; usually, this points to the default next-hop.
1762 * If the FIB lookup fails, return NULL.
1763 *
1764 * FUTURE: Support multiple forwarding tables for IPv6.
1765 *
1766 * Returns NULL if no ifp could be found.
1767 */
1768 static struct ifnet *
1769 in6p_lookup_mcast_ifp(const struct inpcb *in6p,
1770 const struct sockaddr_in6 *gsin6)
1771 {
1772 struct route_in6 ro6;
1773 struct ifnet *ifp;
1774
1775 KASSERT(in6p->inp_vflag & INP_IPV6,
1776 ("%s: not INP_IPV6 inpcb", __func__));
1777 KASSERT(gsin6->sin6_family == AF_INET6,
1778 ("%s: not AF_INET6 group", __func__));
1779 KASSERT(IN6_IS_ADDR_MULTICAST(&gsin6->sin6_addr),
1780 ("%s: not multicast", __func__));
1781
1782 ifp = NULL;
1783 memset(&ro6, 0, sizeof(struct route_in6));
1784 memcpy(&ro6.ro_dst, gsin6, sizeof(struct sockaddr_in6));
1785 rtalloc_ign_fib((struct route *)&ro6, 0,
1786 in6p ? in6p->inp_inc.inc_fibnum : RT_DEFAULT_FIB);
1787 if (ro6.ro_rt != NULL) {
1788 ifp = ro6.ro_rt->rt_ifp;
1789 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
1790 RTFREE(ro6.ro_rt);
1791 }
1792
1793 return (ifp);
1794 }
1795
1796 /*
1797 * Join an IPv6 multicast group, possibly with a source.
1798 *
1799 * FIXME: The KAME use of the unspecified address (::)
1800 * to join *all* multicast groups is currently unsupported.
1801 */
1802 static int
1803 in6p_join_group(struct inpcb *inp, struct sockopt *sopt)
1804 {
1805 struct group_source_req gsr;
1806 sockunion_t *gsa, *ssa;
1807 struct ifnet *ifp;
1808 struct in6_mfilter *imf;
1809 struct ip6_moptions *imo;
1810 struct in6_multi *inm;
1811 struct in6_msource *lims;
1812 size_t idx;
1813 int error, is_new;
1814
1815 ifp = NULL;
1816 imf = NULL;
1817 lims = NULL;
1818 error = 0;
1819 is_new = 0;
1820
1821 memset(&gsr, 0, sizeof(struct group_source_req));
1822 gsa = (sockunion_t *)&gsr.gsr_group;
1823 gsa->ss.ss_family = AF_UNSPEC;
1824 ssa = (sockunion_t *)&gsr.gsr_source;
1825 ssa->ss.ss_family = AF_UNSPEC;
1826
1827 /*
1828 * Chew everything into struct group_source_req.
1829 * Overwrite the port field if present, as the sockaddr
1830 * being copied in may be matched with a binary comparison.
1831 * Ignore passed-in scope ID.
1832 */
1833 switch (sopt->sopt_name) {
1834 case IPV6_JOIN_GROUP: {
1835 struct ipv6_mreq mreq;
1836
1837 error = sooptcopyin(sopt, &mreq, sizeof(struct ipv6_mreq),
1838 sizeof(struct ipv6_mreq));
1839 if (error)
1840 return (error);
1841
1842 gsa->sin6.sin6_family = AF_INET6;
1843 gsa->sin6.sin6_len = sizeof(struct sockaddr_in6);
1844 gsa->sin6.sin6_addr = mreq.ipv6mr_multiaddr;
1845
1846 if (mreq.ipv6mr_interface == 0) {
1847 ifp = in6p_lookup_mcast_ifp(inp, &gsa->sin6);
1848 } else {
1849 if (mreq.ipv6mr_interface < 0 ||
1850 V_if_index < mreq.ipv6mr_interface)
1851 return (EADDRNOTAVAIL);
1852 ifp = ifnet_byindex(mreq.ipv6mr_interface);
1853 }
1854 CTR3(KTR_MLD, "%s: ipv6mr_interface = %d, ifp = %p",
1855 __func__, mreq.ipv6mr_interface, ifp);
1856 } break;
1857
1858 case MCAST_JOIN_GROUP:
1859 case MCAST_JOIN_SOURCE_GROUP:
1860 if (sopt->sopt_name == MCAST_JOIN_GROUP) {
1861 error = sooptcopyin(sopt, &gsr,
1862 sizeof(struct group_req),
1863 sizeof(struct group_req));
1864 } else if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1865 error = sooptcopyin(sopt, &gsr,
1866 sizeof(struct group_source_req),
1867 sizeof(struct group_source_req));
1868 }
1869 if (error)
1870 return (error);
1871
1872 if (gsa->sin6.sin6_family != AF_INET6 ||
1873 gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1874 return (EINVAL);
1875
1876 if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1877 if (ssa->sin6.sin6_family != AF_INET6 ||
1878 ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
1879 return (EINVAL);
1880 if (IN6_IS_ADDR_MULTICAST(&ssa->sin6.sin6_addr))
1881 return (EINVAL);
1882 /*
1883 * TODO: Validate embedded scope ID in source
1884 * list entry against passed-in ifp, if and only
1885 * if source list filter entry is iface or node local.
1886 */
1887 in6_clearscope(&ssa->sin6.sin6_addr);
1888 ssa->sin6.sin6_port = 0;
1889 ssa->sin6.sin6_scope_id = 0;
1890 }
1891
1892 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1893 return (EADDRNOTAVAIL);
1894 ifp = ifnet_byindex(gsr.gsr_interface);
1895 break;
1896
1897 default:
1898 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
1899 __func__, sopt->sopt_name);
1900 return (EOPNOTSUPP);
1901 break;
1902 }
1903
1904 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
1905 return (EINVAL);
1906
1907 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0)
1908 return (EADDRNOTAVAIL);
1909
1910 gsa->sin6.sin6_port = 0;
1911 gsa->sin6.sin6_scope_id = 0;
1912
1913 /*
1914 * Always set the scope zone ID on memberships created from userland.
1915 * Use the passed-in ifp to do this.
1916 * XXX The in6_setscope() return value is meaningless.
1917 * XXX SCOPE6_LOCK() is taken by in6_setscope().
1918 */
1919 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
1920
1921 imo = in6p_findmoptions(inp);
1922 idx = im6o_match_group(imo, ifp, &gsa->sa);
1923 if (idx == -1) {
1924 is_new = 1;
1925 } else {
1926 inm = imo->im6o_membership[idx];
1927 imf = &imo->im6o_mfilters[idx];
1928 if (ssa->ss.ss_family != AF_UNSPEC) {
1929 /*
1930 * MCAST_JOIN_SOURCE_GROUP on an exclusive membership
1931 * is an error. On an existing inclusive membership,
1932 * it just adds the source to the filter list.
1933 */
1934 if (imf->im6f_st[1] != MCAST_INCLUDE) {
1935 error = EINVAL;
1936 goto out_in6p_locked;
1937 }
1938 /*
1939 * Throw out duplicates.
1940 *
1941 * XXX FIXME: This makes a naive assumption that
1942 * even if entries exist for *ssa in this imf,
1943 * they will be rejected as dupes, even if they
1944 * are not valid in the current mode (in-mode).
1945 *
1946 * in6_msource is transactioned just as for anything
1947 * else in SSM -- but note naive use of in6m_graft()
1948 * below for allocating new filter entries.
1949 *
1950 * This is only an issue if someone mixes the
1951 * full-state SSM API with the delta-based API,
1952 * which is discouraged in the relevant RFCs.
1953 */
1954 lims = im6o_match_source(imo, idx, &ssa->sa);
1955 if (lims != NULL /*&&
1956 lims->im6sl_st[1] == MCAST_INCLUDE*/) {
1957 error = EADDRNOTAVAIL;
1958 goto out_in6p_locked;
1959 }
1960 } else {
1961 /*
1962 * MCAST_JOIN_GROUP alone, on any existing membership,
1963 * is rejected, to stop the same inpcb tying up
1964 * multiple refs to the in_multi.
1965 * On an existing inclusive membership, this is also
1966 * an error; if you want to change filter mode,
1967 * you must use the userland API setsourcefilter().
1968 * XXX We don't reject this for imf in UNDEFINED
1969 * state at t1, because allocation of a filter
1970 * is atomic with allocation of a membership.
1971 */
1972 error = EINVAL;
1973 goto out_in6p_locked;
1974 }
1975 }
1976
1977 /*
1978 * Begin state merge transaction at socket layer.
1979 */
1980 INP_WLOCK_ASSERT(inp);
1981
1982 if (is_new) {
1983 if (imo->im6o_num_memberships == imo->im6o_max_memberships) {
1984 error = im6o_grow(imo);
1985 if (error)
1986 goto out_in6p_locked;
1987 }
1988 /*
1989 * Allocate the new slot upfront so we can deal with
1990 * grafting the new source filter in same code path
1991 * as for join-source on existing membership.
1992 */
1993 idx = imo->im6o_num_memberships;
1994 imo->im6o_membership[idx] = NULL;
1995 imo->im6o_num_memberships++;
1996 KASSERT(imo->im6o_mfilters != NULL,
1997 ("%s: im6f_mfilters vector was not allocated", __func__));
1998 imf = &imo->im6o_mfilters[idx];
1999 KASSERT(RB_EMPTY(&imf->im6f_sources),
2000 ("%s: im6f_sources not empty", __func__));
2001 }
2002
2003 /*
2004 * Graft new source into filter list for this inpcb's
2005 * membership of the group. The in6_multi may not have
2006 * been allocated yet if this is a new membership, however,
2007 * the in_mfilter slot will be allocated and must be initialized.
2008 *
2009 * Note: Grafting of exclusive mode filters doesn't happen
2010 * in this path.
2011 * XXX: Should check for non-NULL lims (node exists but may
2012 * not be in-mode) for interop with full-state API.
2013 */
2014 if (ssa->ss.ss_family != AF_UNSPEC) {
2015 /* Membership starts in IN mode */
2016 if (is_new) {
2017 CTR1(KTR_MLD, "%s: new join w/source", __func__);
2018 im6f_init(imf, MCAST_UNDEFINED, MCAST_INCLUDE);
2019 } else {
2020 CTR2(KTR_MLD, "%s: %s source", __func__, "allow");
2021 }
2022 lims = im6f_graft(imf, MCAST_INCLUDE, &ssa->sin6);
2023 if (lims == NULL) {
2024 CTR1(KTR_MLD, "%s: merge imf state failed",
2025 __func__);
2026 error = ENOMEM;
2027 goto out_im6o_free;
2028 }
2029 } else {
2030 /* No address specified; Membership starts in EX mode */
2031 if (is_new) {
2032 CTR1(KTR_MLD, "%s: new join w/o source", __func__);
2033 im6f_init(imf, MCAST_UNDEFINED, MCAST_EXCLUDE);
2034 }
2035 }
2036
2037 /*
2038 * Begin state merge transaction at MLD layer.
2039 */
2040 IN6_MULTI_LOCK();
2041
2042 if (is_new) {
2043 error = in6_mc_join_locked(ifp, &gsa->sin6.sin6_addr, imf,
2044 &inm, 0);
2045 if (error)
2046 goto out_im6o_free;
2047 imo->im6o_membership[idx] = inm;
2048 } else {
2049 CTR1(KTR_MLD, "%s: merge inm state", __func__);
2050 error = in6m_merge(inm, imf);
2051 if (error) {
2052 CTR1(KTR_MLD, "%s: failed to merge inm state",
2053 __func__);
2054 goto out_im6f_rollback;
2055 }
2056 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
2057 error = mld_change_state(inm, 0);
2058 if (error) {
2059 CTR1(KTR_MLD, "%s: failed mld downcall",
2060 __func__);
2061 goto out_im6f_rollback;
2062 }
2063 }
2064
2065 IN6_MULTI_UNLOCK();
2066
2067 out_im6f_rollback:
2068 INP_WLOCK_ASSERT(inp);
2069 if (error) {
2070 im6f_rollback(imf);
2071 if (is_new)
2072 im6f_purge(imf);
2073 else
2074 im6f_reap(imf);
2075 } else {
2076 im6f_commit(imf);
2077 }
2078
2079 out_im6o_free:
2080 if (error && is_new) {
2081 imo->im6o_membership[idx] = NULL;
2082 --imo->im6o_num_memberships;
2083 }
2084
2085 out_in6p_locked:
2086 INP_WUNLOCK(inp);
2087 return (error);
2088 }
2089
2090 /*
2091 * Leave an IPv6 multicast group on an inpcb, possibly with a source.
2092 */
2093 static int
2094 in6p_leave_group(struct inpcb *inp, struct sockopt *sopt)
2095 {
2096 struct ipv6_mreq mreq;
2097 struct group_source_req gsr;
2098 sockunion_t *gsa, *ssa;
2099 struct ifnet *ifp;
2100 struct in6_mfilter *imf;
2101 struct ip6_moptions *imo;
2102 struct in6_msource *ims;
2103 struct in6_multi *inm;
2104 uint32_t ifindex;
2105 size_t idx;
2106 int error, is_final;
2107 #ifdef KTR
2108 char ip6tbuf[INET6_ADDRSTRLEN];
2109 #endif
2110
2111 ifp = NULL;
2112 ifindex = 0;
2113 error = 0;
2114 is_final = 1;
2115
2116 memset(&gsr, 0, sizeof(struct group_source_req));
2117 gsa = (sockunion_t *)&gsr.gsr_group;
2118 gsa->ss.ss_family = AF_UNSPEC;
2119 ssa = (sockunion_t *)&gsr.gsr_source;
2120 ssa->ss.ss_family = AF_UNSPEC;
2121
2122 /*
2123 * Chew everything passed in up into a struct group_source_req
2124 * as that is easier to process.
2125 * Note: Any embedded scope ID in the multicast group passed
2126 * in by userland is ignored, the interface index is the recommended
2127 * mechanism to specify an interface; see below.
2128 */
2129 switch (sopt->sopt_name) {
2130 case IPV6_LEAVE_GROUP:
2131 error = sooptcopyin(sopt, &mreq, sizeof(struct ipv6_mreq),
2132 sizeof(struct ipv6_mreq));
2133 if (error)
2134 return (error);
2135 gsa->sin6.sin6_family = AF_INET6;
2136 gsa->sin6.sin6_len = sizeof(struct sockaddr_in6);
2137 gsa->sin6.sin6_addr = mreq.ipv6mr_multiaddr;
2138 gsa->sin6.sin6_port = 0;
2139 gsa->sin6.sin6_scope_id = 0;
2140 ifindex = mreq.ipv6mr_interface;
2141 break;
2142
2143 case MCAST_LEAVE_GROUP:
2144 case MCAST_LEAVE_SOURCE_GROUP:
2145 if (sopt->sopt_name == MCAST_LEAVE_GROUP) {
2146 error = sooptcopyin(sopt, &gsr,
2147 sizeof(struct group_req),
2148 sizeof(struct group_req));
2149 } else if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2150 error = sooptcopyin(sopt, &gsr,
2151 sizeof(struct group_source_req),
2152 sizeof(struct group_source_req));
2153 }
2154 if (error)
2155 return (error);
2156
2157 if (gsa->sin6.sin6_family != AF_INET6 ||
2158 gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
2159 return (EINVAL);
2160 if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2161 if (ssa->sin6.sin6_family != AF_INET6 ||
2162 ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
2163 return (EINVAL);
2164 if (IN6_IS_ADDR_MULTICAST(&ssa->sin6.sin6_addr))
2165 return (EINVAL);
2166 /*
2167 * TODO: Validate embedded scope ID in source
2168 * list entry against passed-in ifp, if and only
2169 * if source list filter entry is iface or node local.
2170 */
2171 in6_clearscope(&ssa->sin6.sin6_addr);
2172 }
2173 gsa->sin6.sin6_port = 0;
2174 gsa->sin6.sin6_scope_id = 0;
2175 ifindex = gsr.gsr_interface;
2176 break;
2177
2178 default:
2179 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
2180 __func__, sopt->sopt_name);
2181 return (EOPNOTSUPP);
2182 break;
2183 }
2184
2185 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
2186 return (EINVAL);
2187
2188 /*
2189 * Validate interface index if provided. If no interface index
2190 * was provided separately, attempt to look the membership up
2191 * from the default scope as a last resort to disambiguate
2192 * the membership we are being asked to leave.
2193 * XXX SCOPE6 lock potentially taken here.
2194 */
2195 if (ifindex != 0) {
2196 if (ifindex < 0 || V_if_index < ifindex)
2197 return (EADDRNOTAVAIL);
2198 ifp = ifnet_byindex(ifindex);
2199 if (ifp == NULL)
2200 return (EADDRNOTAVAIL);
2201 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
2202 } else {
2203 error = sa6_embedscope(&gsa->sin6, V_ip6_use_defzone);
2204 if (error)
2205 return (EADDRNOTAVAIL);
2206 /*
2207 * Some badly behaved applications don't pass an ifindex
2208 * or a scope ID, which is an API violation. In this case,
2209 * perform a lookup as per a v6 join.
2210 *
2211 * XXX For now, stomp on zone ID for the corner case.
2212 * This is not the 'KAME way', but we need to see the ifp
2213 * directly until such time as this implementation is
2214 * refactored, assuming the scope IDs are the way to go.
2215 */
2216 ifindex = ntohs(gsa->sin6.sin6_addr.s6_addr16[1]);
2217 if (ifindex == 0) {
2218 CTR2(KTR_MLD, "%s: warning: no ifindex, looking up "
2219 "ifp for group %s.", __func__,
2220 ip6_sprintf(ip6tbuf, &gsa->sin6.sin6_addr));
2221 ifp = in6p_lookup_mcast_ifp(inp, &gsa->sin6);
2222 } else {
2223 ifp = ifnet_byindex(ifindex);
2224 }
2225 if (ifp == NULL)
2226 return (EADDRNOTAVAIL);
2227 }
2228
2229 CTR2(KTR_MLD, "%s: ifp = %p", __func__, ifp);
2230 KASSERT(ifp != NULL, ("%s: ifp did not resolve", __func__));
2231
2232 /*
2233 * Find the membership in the membership array.
2234 */
2235 imo = in6p_findmoptions(inp);
2236 idx = im6o_match_group(imo, ifp, &gsa->sa);
2237 if (idx == -1) {
2238 error = EADDRNOTAVAIL;
2239 goto out_in6p_locked;
2240 }
2241 inm = imo->im6o_membership[idx];
2242 imf = &imo->im6o_mfilters[idx];
2243
2244 if (ssa->ss.ss_family != AF_UNSPEC)
2245 is_final = 0;
2246
2247 /*
2248 * Begin state merge transaction at socket layer.
2249 */
2250 INP_WLOCK_ASSERT(inp);
2251
2252 /*
2253 * If we were instructed only to leave a given source, do so.
2254 * MCAST_LEAVE_SOURCE_GROUP is only valid for inclusive memberships.
2255 */
2256 if (is_final) {
2257 im6f_leave(imf);
2258 } else {
2259 if (imf->im6f_st[0] == MCAST_EXCLUDE) {
2260 error = EADDRNOTAVAIL;
2261 goto out_in6p_locked;
2262 }
2263 ims = im6o_match_source(imo, idx, &ssa->sa);
2264 if (ims == NULL) {
2265 CTR3(KTR_MLD, "%s: source %p %spresent", __func__,
2266 ip6_sprintf(ip6tbuf, &ssa->sin6.sin6_addr),
2267 "not ");
2268 error = EADDRNOTAVAIL;
2269 goto out_in6p_locked;
2270 }
2271 CTR2(KTR_MLD, "%s: %s source", __func__, "block");
2272 error = im6f_prune(imf, &ssa->sin6);
2273 if (error) {
2274 CTR1(KTR_MLD, "%s: merge imf state failed",
2275 __func__);
2276 goto out_in6p_locked;
2277 }
2278 }
2279
2280 /*
2281 * Begin state merge transaction at MLD layer.
2282 */
2283 IN6_MULTI_LOCK();
2284
2285 if (is_final) {
2286 /*
2287 * Give up the multicast address record to which
2288 * the membership points.
2289 */
2290 (void)in6_mc_leave_locked(inm, imf);
2291 } else {
2292 CTR1(KTR_MLD, "%s: merge inm state", __func__);
2293 error = in6m_merge(inm, imf);
2294 if (error) {
2295 CTR1(KTR_MLD, "%s: failed to merge inm state",
2296 __func__);
2297 goto out_im6f_rollback;
2298 }
2299
2300 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
2301 error = mld_change_state(inm, 0);
2302 if (error) {
2303 CTR1(KTR_MLD, "%s: failed mld downcall",
2304 __func__);
2305 }
2306 }
2307
2308 IN6_MULTI_UNLOCK();
2309
2310 out_im6f_rollback:
2311 if (error)
2312 im6f_rollback(imf);
2313 else
2314 im6f_commit(imf);
2315
2316 im6f_reap(imf);
2317
2318 if (is_final) {
2319 /* Remove the gap in the membership array. */
2320 for (++idx; idx < imo->im6o_num_memberships; ++idx) {
2321 imo->im6o_membership[idx-1] = imo->im6o_membership[idx];
2322 imo->im6o_mfilters[idx-1] = imo->im6o_mfilters[idx];
2323 }
2324 imo->im6o_num_memberships--;
2325 }
2326
2327 out_in6p_locked:
2328 INP_WUNLOCK(inp);
2329 return (error);
2330 }
2331
2332 /*
2333 * Select the interface for transmitting IPv6 multicast datagrams.
2334 *
2335 * Either an instance of struct in6_addr or an instance of struct ipv6_mreqn
2336 * may be passed to this socket option. An address of in6addr_any or an
2337 * interface index of 0 is used to remove a previous selection.
2338 * When no interface is selected, one is chosen for every send.
2339 */
2340 static int
2341 in6p_set_multicast_if(struct inpcb *inp, struct sockopt *sopt)
2342 {
2343 struct ifnet *ifp;
2344 struct ip6_moptions *imo;
2345 u_int ifindex;
2346 int error;
2347
2348 if (sopt->sopt_valsize != sizeof(u_int))
2349 return (EINVAL);
2350
2351 error = sooptcopyin(sopt, &ifindex, sizeof(u_int), sizeof(u_int));
2352 if (error)
2353 return (error);
2354 if (ifindex < 0 || V_if_index < ifindex)
2355 return (EINVAL);
2356
2357 ifp = ifnet_byindex(ifindex);
2358 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0)
2359 return (EADDRNOTAVAIL);
2360
2361 imo = in6p_findmoptions(inp);
2362 imo->im6o_multicast_ifp = ifp;
2363 INP_WUNLOCK(inp);
2364
2365 return (0);
2366 }
2367
2368 /*
2369 * Atomically set source filters on a socket for an IPv6 multicast group.
2370 *
2371 * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
2372 */
2373 static int
2374 in6p_set_source_filters(struct inpcb *inp, struct sockopt *sopt)
2375 {
2376 struct __msfilterreq msfr;
2377 sockunion_t *gsa;
2378 struct ifnet *ifp;
2379 struct in6_mfilter *imf;
2380 struct ip6_moptions *imo;
2381 struct in6_multi *inm;
2382 size_t idx;
2383 int error;
2384
2385 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
2386 sizeof(struct __msfilterreq));
2387 if (error)
2388 return (error);
2389
2390 if (msfr.msfr_nsrcs > in6_mcast_maxsocksrc)
2391 return (ENOBUFS);
2392
2393 if (msfr.msfr_fmode != MCAST_EXCLUDE &&
2394 msfr.msfr_fmode != MCAST_INCLUDE)
2395 return (EINVAL);
2396
2397 if (msfr.msfr_group.ss_family != AF_INET6 ||
2398 msfr.msfr_group.ss_len != sizeof(struct sockaddr_in6))
2399 return (EINVAL);
2400
2401 gsa = (sockunion_t *)&msfr.msfr_group;
2402 if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
2403 return (EINVAL);
2404
2405 gsa->sin6.sin6_port = 0; /* ignore port */
2406
2407 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
2408 return (EADDRNOTAVAIL);
2409 ifp = ifnet_byindex(msfr.msfr_ifindex);
2410 if (ifp == NULL)
2411 return (EADDRNOTAVAIL);
2412 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
2413
2414 /*
2415 * Take the INP write lock.
2416 * Check if this socket is a member of this group.
2417 */
2418 imo = in6p_findmoptions(inp);
2419 idx = im6o_match_group(imo, ifp, &gsa->sa);
2420 if (idx == -1 || imo->im6o_mfilters == NULL) {
2421 error = EADDRNOTAVAIL;
2422 goto out_in6p_locked;
2423 }
2424 inm = imo->im6o_membership[idx];
2425 imf = &imo->im6o_mfilters[idx];
2426
2427 /*
2428 * Begin state merge transaction at socket layer.
2429 */
2430 INP_WLOCK_ASSERT(inp);
2431
2432 imf->im6f_st[1] = msfr.msfr_fmode;
2433
2434 /*
2435 * Apply any new source filters, if present.
2436 * Make a copy of the user-space source vector so
2437 * that we may copy them with a single copyin. This
2438 * allows us to deal with page faults up-front.
2439 */
2440 if (msfr.msfr_nsrcs > 0) {
2441 struct in6_msource *lims;
2442 struct sockaddr_in6 *psin;
2443 struct sockaddr_storage *kss, *pkss;
2444 int i;
2445
2446 INP_WUNLOCK(inp);
2447
2448 CTR2(KTR_MLD, "%s: loading %lu source list entries",
2449 __func__, (unsigned long)msfr.msfr_nsrcs);
2450 kss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
2451 M_TEMP, M_WAITOK);
2452 error = copyin(msfr.msfr_srcs, kss,
2453 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
2454 if (error) {
2455 free(kss, M_TEMP);
2456 return (error);
2457 }
2458
2459 INP_WLOCK(inp);
2460
2461 /*
2462 * Mark all source filters as UNDEFINED at t1.
2463 * Restore new group filter mode, as im6f_leave()
2464 * will set it to INCLUDE.
2465 */
2466 im6f_leave(imf);
2467 imf->im6f_st[1] = msfr.msfr_fmode;
2468
2469 /*
2470 * Update socket layer filters at t1, lazy-allocating
2471 * new entries. This saves a bunch of memory at the
2472 * cost of one RB_FIND() per source entry; duplicate
2473 * entries in the msfr_nsrcs vector are ignored.
2474 * If we encounter an error, rollback transaction.
2475 *
2476 * XXX This too could be replaced with a set-symmetric
2477 * difference like loop to avoid walking from root
2478 * every time, as the key space is common.
2479 */
2480 for (i = 0, pkss = kss; i < msfr.msfr_nsrcs; i++, pkss++) {
2481 psin = (struct sockaddr_in6 *)pkss;
2482 if (psin->sin6_family != AF_INET6) {
2483 error = EAFNOSUPPORT;
2484 break;
2485 }
2486 if (psin->sin6_len != sizeof(struct sockaddr_in6)) {
2487 error = EINVAL;
2488 break;
2489 }
2490 if (IN6_IS_ADDR_MULTICAST(&psin->sin6_addr)) {
2491 error = EINVAL;
2492 break;
2493 }
2494 /*
2495 * TODO: Validate embedded scope ID in source
2496 * list entry against passed-in ifp, if and only
2497 * if source list filter entry is iface or node local.
2498 */
2499 in6_clearscope(&psin->sin6_addr);
2500 error = im6f_get_source(imf, psin, &lims);
2501 if (error)
2502 break;
2503 lims->im6sl_st[1] = imf->im6f_st[1];
2504 }
2505 free(kss, M_TEMP);
2506 }
2507
2508 if (error)
2509 goto out_im6f_rollback;
2510
2511 INP_WLOCK_ASSERT(inp);
2512 IN6_MULTI_LOCK();
2513
2514 /*
2515 * Begin state merge transaction at MLD layer.
2516 */
2517 CTR1(KTR_MLD, "%s: merge inm state", __func__);
2518 error = in6m_merge(inm, imf);
2519 if (error) {
2520 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
2521 goto out_im6f_rollback;
2522 }
2523
2524 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
2525 error = mld_change_state(inm, 0);
2526 if (error)
2527 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
2528
2529 IN6_MULTI_UNLOCK();
2530
2531 out_im6f_rollback:
2532 if (error)
2533 im6f_rollback(imf);
2534 else
2535 im6f_commit(imf);
2536
2537 im6f_reap(imf);
2538
2539 out_in6p_locked:
2540 INP_WUNLOCK(inp);
2541 return (error);
2542 }
2543
2544 /*
2545 * Set the IP multicast options in response to user setsockopt().
2546 *
2547 * Many of the socket options handled in this function duplicate the
2548 * functionality of socket options in the regular unicast API. However,
2549 * it is not possible to merge the duplicate code, because the idempotence
2550 * of the IPv6 multicast part of the BSD Sockets API must be preserved;
2551 * the effects of these options must be treated as separate and distinct.
2552 *
2553 * SMPng: XXX: Unlocked read of inp_socket believed OK.
2554 */
2555 int
2556 ip6_setmoptions(struct inpcb *inp, struct sockopt *sopt)
2557 {
2558 struct ip6_moptions *im6o;
2559 int error;
2560
2561 error = 0;
2562
2563 /*
2564 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
2565 * or is a divert socket, reject it.
2566 */
2567 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
2568 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
2569 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM))
2570 return (EOPNOTSUPP);
2571
2572 switch (sopt->sopt_name) {
2573 case IPV6_MULTICAST_IF:
2574 error = in6p_set_multicast_if(inp, sopt);
2575 break;
2576
2577 case IPV6_MULTICAST_HOPS: {
2578 int hlim;
2579
2580 if (sopt->sopt_valsize != sizeof(int)) {
2581 error = EINVAL;
2582 break;
2583 }
2584 error = sooptcopyin(sopt, &hlim, sizeof(hlim), sizeof(int));
2585 if (error)
2586 break;
2587 if (hlim < -1 || hlim > 255) {
2588 error = EINVAL;
2589 break;
2590 } else if (hlim == -1) {
2591 hlim = V_ip6_defmcasthlim;
2592 }
2593 im6o = in6p_findmoptions(inp);
2594 im6o->im6o_multicast_hlim = hlim;
2595 INP_WUNLOCK(inp);
2596 break;
2597 }
2598
2599 case IPV6_MULTICAST_LOOP: {
2600 u_int loop;
2601
2602 /*
2603 * Set the loopback flag for outgoing multicast packets.
2604 * Must be zero or one.
2605 */
2606 if (sopt->sopt_valsize != sizeof(u_int)) {
2607 error = EINVAL;
2608 break;
2609 }
2610 error = sooptcopyin(sopt, &loop, sizeof(u_int), sizeof(u_int));
2611 if (error)
2612 break;
2613 if (loop > 1) {
2614 error = EINVAL;
2615 break;
2616 }
2617 im6o = in6p_findmoptions(inp);
2618 im6o->im6o_multicast_loop = loop;
2619 INP_WUNLOCK(inp);
2620 break;
2621 }
2622
2623 case IPV6_JOIN_GROUP:
2624 case MCAST_JOIN_GROUP:
2625 case MCAST_JOIN_SOURCE_GROUP:
2626 error = in6p_join_group(inp, sopt);
2627 break;
2628
2629 case IPV6_LEAVE_GROUP:
2630 case MCAST_LEAVE_GROUP:
2631 case MCAST_LEAVE_SOURCE_GROUP:
2632 error = in6p_leave_group(inp, sopt);
2633 break;
2634
2635 case MCAST_BLOCK_SOURCE:
2636 case MCAST_UNBLOCK_SOURCE:
2637 error = in6p_block_unblock_source(inp, sopt);
2638 break;
2639
2640 case IPV6_MSFILTER:
2641 error = in6p_set_source_filters(inp, sopt);
2642 break;
2643
2644 default:
2645 error = EOPNOTSUPP;
2646 break;
2647 }
2648
2649 INP_UNLOCK_ASSERT(inp);
2650
2651 return (error);
2652 }
2653
2654 /*
2655 * Expose MLD's multicast filter mode and source list(s) to userland,
2656 * keyed by (ifindex, group).
2657 * The filter mode is written out as a uint32_t, followed by
2658 * 0..n of struct in6_addr.
2659 * For use by ifmcstat(8).
2660 * SMPng: NOTE: unlocked read of ifindex space.
2661 */
2662 static int
2663 sysctl_ip6_mcast_filters(SYSCTL_HANDLER_ARGS)
2664 {
2665 struct in6_addr mcaddr;
2666 struct in6_addr src;
2667 struct ifnet *ifp;
2668 struct ifmultiaddr *ifma;
2669 struct in6_multi *inm;
2670 struct ip6_msource *ims;
2671 int *name;
2672 int retval;
2673 u_int namelen;
2674 uint32_t fmode, ifindex;
2675 #ifdef KTR
2676 char ip6tbuf[INET6_ADDRSTRLEN];
2677 #endif
2678
2679 name = (int *)arg1;
2680 namelen = arg2;
2681
2682 if (req->newptr != NULL)
2683 return (EPERM);
2684
2685 /* int: ifindex + 4 * 32 bits of IPv6 address */
2686 if (namelen != 5)
2687 return (EINVAL);
2688
2689 ifindex = name[0];
2690 if (ifindex <= 0 || ifindex > V_if_index) {
2691 CTR2(KTR_MLD, "%s: ifindex %u out of range",
2692 __func__, ifindex);
2693 return (ENOENT);
2694 }
2695
2696 memcpy(&mcaddr, &name[1], sizeof(struct in6_addr));
2697 if (!IN6_IS_ADDR_MULTICAST(&mcaddr)) {
2698 CTR2(KTR_MLD, "%s: group %s is not multicast",
2699 __func__, ip6_sprintf(ip6tbuf, &mcaddr));
2700 return (EINVAL);
2701 }
2702
2703 ifp = ifnet_byindex(ifindex);
2704 if (ifp == NULL) {
2705 CTR2(KTR_MLD, "%s: no ifp for ifindex %u",
2706 __func__, ifindex);
2707 return (ENOENT);
2708 }
2709 /*
2710 * Internal MLD lookups require that scope/zone ID is set.
2711 */
2712 (void)in6_setscope(&mcaddr, ifp, NULL);
2713
2714 retval = sysctl_wire_old_buffer(req,
2715 sizeof(uint32_t) + (in6_mcast_maxgrpsrc * sizeof(struct in6_addr)));
2716 if (retval)
2717 return (retval);
2718
2719 IN6_MULTI_LOCK();
2720
2721 IF_ADDR_RLOCK(ifp);
2722 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2723 if (ifma->ifma_addr->sa_family != AF_INET6 ||
2724 ifma->ifma_protospec == NULL)
2725 continue;
2726 inm = (struct in6_multi *)ifma->ifma_protospec;
2727 if (!IN6_ARE_ADDR_EQUAL(&inm->in6m_addr, &mcaddr))
2728 continue;
2729 fmode = inm->in6m_st[1].iss_fmode;
2730 retval = SYSCTL_OUT(req, &fmode, sizeof(uint32_t));
2731 if (retval != 0)
2732 break;
2733 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
2734 CTR2(KTR_MLD, "%s: visit node %p", __func__, ims);
2735 /*
2736 * Only copy-out sources which are in-mode.
2737 */
2738 if (fmode != im6s_get_mode(inm, ims, 1)) {
2739 CTR1(KTR_MLD, "%s: skip non-in-mode",
2740 __func__);
2741 continue;
2742 }
2743 src = ims->im6s_addr;
2744 retval = SYSCTL_OUT(req, &src,
2745 sizeof(struct in6_addr));
2746 if (retval != 0)
2747 break;
2748 }
2749 }
2750 IF_ADDR_RUNLOCK(ifp);
2751
2752 IN6_MULTI_UNLOCK();
2753
2754 return (retval);
2755 }
2756
2757 #ifdef KTR
2758
2759 static const char *in6m_modestrs[] = { "un", "in", "ex" };
2760
2761 static const char *
2762 in6m_mode_str(const int mode)
2763 {
2764
2765 if (mode >= MCAST_UNDEFINED && mode <= MCAST_EXCLUDE)
2766 return (in6m_modestrs[mode]);
2767 return ("??");
2768 }
2769
2770 static const char *in6m_statestrs[] = {
2771 "not-member",
2772 "silent",
2773 "idle",
2774 "lazy",
2775 "sleeping",
2776 "awakening",
2777 "query-pending",
2778 "sg-query-pending",
2779 "leaving"
2780 };
2781
2782 static const char *
2783 in6m_state_str(const int state)
2784 {
2785
2786 if (state >= MLD_NOT_MEMBER && state <= MLD_LEAVING_MEMBER)
2787 return (in6m_statestrs[state]);
2788 return ("??");
2789 }
2790
2791 /*
2792 * Dump an in6_multi structure to the console.
2793 */
2794 void
2795 in6m_print(const struct in6_multi *inm)
2796 {
2797 int t;
2798 char ip6tbuf[INET6_ADDRSTRLEN];
2799
2800 if ((ktr_mask & KTR_MLD) == 0)
2801 return;
2802
2803 printf("%s: --- begin in6m %p ---\n", __func__, inm);
2804 printf("addr %s ifp %p(%s) ifma %p\n",
2805 ip6_sprintf(ip6tbuf, &inm->in6m_addr),
2806 inm->in6m_ifp,
2807 inm->in6m_ifp->if_xname,
2808 inm->in6m_ifma);
2809 printf("timer %u state %s refcount %u scq.len %u\n",
2810 inm->in6m_timer,
2811 in6m_state_str(inm->in6m_state),
2812 inm->in6m_refcount,
2813 inm->in6m_scq.ifq_len);
2814 printf("mli %p nsrc %lu sctimer %u scrv %u\n",
2815 inm->in6m_mli,
2816 inm->in6m_nsrc,
2817 inm->in6m_sctimer,
2818 inm->in6m_scrv);
2819 for (t = 0; t < 2; t++) {
2820 printf("t%d: fmode %s asm %u ex %u in %u rec %u\n", t,
2821 in6m_mode_str(inm->in6m_st[t].iss_fmode),
2822 inm->in6m_st[t].iss_asm,
2823 inm->in6m_st[t].iss_ex,
2824 inm->in6m_st[t].iss_in,
2825 inm->in6m_st[t].iss_rec);
2826 }
2827 printf("%s: --- end in6m %p ---\n", __func__, inm);
2828 }
2829
2830 #else /* !KTR */
2831
2832 void
2833 in6m_print(const struct in6_multi *inm)
2834 {
2835
2836 }
2837
2838 #endif /* KTR */
Cache object: ffef5491158eadd2dde277b54058e129
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