1 /*-
2 * Copyright (c) 2007-2009 Bruce Simpson.
3 * Copyright (c) 2005 Robert N. M. Watson.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote
15 * products derived from this software without specific prior written
16 * permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 /*
32 * IPv4 multicast socket, group, and socket option processing module.
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/malloc.h>
42 #include <sys/mbuf.h>
43 #include <sys/protosw.h>
44 #include <sys/socket.h>
45 #include <sys/socketvar.h>
46 #include <sys/protosw.h>
47 #include <sys/sysctl.h>
48 #include <sys/ktr.h>
49 #include <sys/taskqueue.h>
50 #include <sys/tree.h>
51
52 #include <net/if.h>
53 #include <net/if_dl.h>
54 #include <net/route.h>
55 #include <net/vnet.h>
56
57 #include <netinet/in.h>
58 #include <netinet/in_systm.h>
59 #include <netinet/in_pcb.h>
60 #include <netinet/in_var.h>
61 #include <netinet/ip_var.h>
62 #include <netinet/igmp_var.h>
63
64 #ifndef KTR_IGMPV3
65 #define KTR_IGMPV3 KTR_INET
66 #endif
67
68 #ifndef __SOCKUNION_DECLARED
69 union sockunion {
70 struct sockaddr_storage ss;
71 struct sockaddr sa;
72 struct sockaddr_dl sdl;
73 struct sockaddr_in sin;
74 };
75 typedef union sockunion sockunion_t;
76 #define __SOCKUNION_DECLARED
77 #endif /* __SOCKUNION_DECLARED */
78
79 static MALLOC_DEFINE(M_INMFILTER, "in_mfilter",
80 "IPv4 multicast PCB-layer source filter");
81 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "IPv4 multicast group");
82 static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "IPv4 multicast options");
83 static MALLOC_DEFINE(M_IPMSOURCE, "ip_msource",
84 "IPv4 multicast IGMP-layer source filter");
85
86 /*
87 * Locking:
88 * - Lock order is: Giant, INP_WLOCK, IN_MULTI_LOCK, IGMP_LOCK, IF_ADDR_LOCK.
89 * - The IF_ADDR_LOCK is implicitly taken by inm_lookup() earlier, however
90 * it can be taken by code in net/if.c also.
91 * - ip_moptions and in_mfilter are covered by the INP_WLOCK.
92 *
93 * struct in_multi is covered by IN_MULTI_LOCK. There isn't strictly
94 * any need for in_multi itself to be virtualized -- it is bound to an ifp
95 * anyway no matter what happens.
96 */
97 struct mtx in_multi_mtx;
98 MTX_SYSINIT(in_multi_mtx, &in_multi_mtx, "in_multi_mtx", MTX_DEF);
99
100 /*
101 * Functions with non-static linkage defined in this file should be
102 * declared in in_var.h:
103 * imo_multi_filter()
104 * in_addmulti()
105 * in_delmulti()
106 * in_joingroup()
107 * in_joingroup_locked()
108 * in_leavegroup()
109 * in_leavegroup_locked()
110 * and ip_var.h:
111 * inp_freemoptions()
112 * inp_getmoptions()
113 * inp_setmoptions()
114 *
115 * XXX: Both carp and pf need to use the legacy (*,G) KPIs in_addmulti()
116 * and in_delmulti().
117 */
118 static void imf_commit(struct in_mfilter *);
119 static int imf_get_source(struct in_mfilter *imf,
120 const struct sockaddr_in *psin,
121 struct in_msource **);
122 static struct in_msource *
123 imf_graft(struct in_mfilter *, const uint8_t,
124 const struct sockaddr_in *);
125 static void imf_leave(struct in_mfilter *);
126 static int imf_prune(struct in_mfilter *, const struct sockaddr_in *);
127 static void imf_purge(struct in_mfilter *);
128 static void imf_rollback(struct in_mfilter *);
129 static void imf_reap(struct in_mfilter *);
130 static int imo_grow(struct ip_moptions *);
131 static size_t imo_match_group(const struct ip_moptions *,
132 const struct ifnet *, const struct sockaddr *);
133 static struct in_msource *
134 imo_match_source(const struct ip_moptions *, const size_t,
135 const struct sockaddr *);
136 static void ims_merge(struct ip_msource *ims,
137 const struct in_msource *lims, const int rollback);
138 static int in_getmulti(struct ifnet *, const struct in_addr *,
139 struct in_multi **);
140 static int inm_get_source(struct in_multi *inm, const in_addr_t haddr,
141 const int noalloc, struct ip_msource **pims);
142 #ifdef KTR
143 static int inm_is_ifp_detached(const struct in_multi *);
144 #endif
145 static int inm_merge(struct in_multi *, /*const*/ struct in_mfilter *);
146 static void inm_purge(struct in_multi *);
147 static void inm_reap(struct in_multi *);
148 static struct ip_moptions *
149 inp_findmoptions(struct inpcb *);
150 static void inp_freemoptions_internal(struct ip_moptions *);
151 static void inp_gcmoptions(void *, int);
152 static int inp_get_source_filters(struct inpcb *, struct sockopt *);
153 static int inp_join_group(struct inpcb *, struct sockopt *);
154 static int inp_leave_group(struct inpcb *, struct sockopt *);
155 static struct ifnet *
156 inp_lookup_mcast_ifp(const struct inpcb *,
157 const struct sockaddr_in *, const struct in_addr);
158 static int inp_block_unblock_source(struct inpcb *, struct sockopt *);
159 static int inp_set_multicast_if(struct inpcb *, struct sockopt *);
160 static int inp_set_source_filters(struct inpcb *, struct sockopt *);
161 static int sysctl_ip_mcast_filters(SYSCTL_HANDLER_ARGS);
162
163 static SYSCTL_NODE(_net_inet_ip, OID_AUTO, mcast, CTLFLAG_RW, 0,
164 "IPv4 multicast");
165
166 static u_long in_mcast_maxgrpsrc = IP_MAX_GROUP_SRC_FILTER;
167 SYSCTL_ULONG(_net_inet_ip_mcast, OID_AUTO, maxgrpsrc,
168 CTLFLAG_RW | CTLFLAG_TUN, &in_mcast_maxgrpsrc, 0,
169 "Max source filters per group");
170 TUNABLE_ULONG("net.inet.ip.mcast.maxgrpsrc", &in_mcast_maxgrpsrc);
171
172 static u_long in_mcast_maxsocksrc = IP_MAX_SOCK_SRC_FILTER;
173 SYSCTL_ULONG(_net_inet_ip_mcast, OID_AUTO, maxsocksrc,
174 CTLFLAG_RW | CTLFLAG_TUN, &in_mcast_maxsocksrc, 0,
175 "Max source filters per socket");
176 TUNABLE_ULONG("net.inet.ip.mcast.maxsocksrc", &in_mcast_maxsocksrc);
177
178 int in_mcast_loop = IP_DEFAULT_MULTICAST_LOOP;
179 SYSCTL_INT(_net_inet_ip_mcast, OID_AUTO, loop, CTLFLAG_RW | CTLFLAG_TUN,
180 &in_mcast_loop, 0, "Loopback multicast datagrams by default");
181 TUNABLE_INT("net.inet.ip.mcast.loop", &in_mcast_loop);
182
183 static SYSCTL_NODE(_net_inet_ip_mcast, OID_AUTO, filters,
184 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ip_mcast_filters,
185 "Per-interface stack-wide source filters");
186
187 static STAILQ_HEAD(, ip_moptions) imo_gc_list =
188 STAILQ_HEAD_INITIALIZER(imo_gc_list);
189 static struct task imo_gc_task = TASK_INITIALIZER(0, inp_gcmoptions, NULL);
190
191 #ifdef KTR
192 /*
193 * Inline function which wraps assertions for a valid ifp.
194 * The ifnet layer will set the ifma's ifp pointer to NULL if the ifp
195 * is detached.
196 */
197 static int __inline
198 inm_is_ifp_detached(const struct in_multi *inm)
199 {
200 struct ifnet *ifp;
201
202 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__));
203 ifp = inm->inm_ifma->ifma_ifp;
204 if (ifp != NULL) {
205 /*
206 * Sanity check that netinet's notion of ifp is the
207 * same as net's.
208 */
209 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__));
210 }
211
212 return (ifp == NULL);
213 }
214 #endif
215
216 /*
217 * Initialize an in_mfilter structure to a known state at t0, t1
218 * with an empty source filter list.
219 */
220 static __inline void
221 imf_init(struct in_mfilter *imf, const int st0, const int st1)
222 {
223 memset(imf, 0, sizeof(struct in_mfilter));
224 RB_INIT(&imf->imf_sources);
225 imf->imf_st[0] = st0;
226 imf->imf_st[1] = st1;
227 }
228
229 /*
230 * Resize the ip_moptions vector to the next power-of-two minus 1.
231 * May be called with locks held; do not sleep.
232 */
233 static int
234 imo_grow(struct ip_moptions *imo)
235 {
236 struct in_multi **nmships;
237 struct in_multi **omships;
238 struct in_mfilter *nmfilters;
239 struct in_mfilter *omfilters;
240 size_t idx;
241 size_t newmax;
242 size_t oldmax;
243
244 nmships = NULL;
245 nmfilters = NULL;
246 omships = imo->imo_membership;
247 omfilters = imo->imo_mfilters;
248 oldmax = imo->imo_max_memberships;
249 newmax = ((oldmax + 1) * 2) - 1;
250
251 if (newmax <= IP_MAX_MEMBERSHIPS) {
252 nmships = (struct in_multi **)realloc(omships,
253 sizeof(struct in_multi *) * newmax, M_IPMOPTS, M_NOWAIT);
254 nmfilters = (struct in_mfilter *)realloc(omfilters,
255 sizeof(struct in_mfilter) * newmax, M_INMFILTER, M_NOWAIT);
256 if (nmships != NULL && nmfilters != NULL) {
257 /* Initialize newly allocated source filter heads. */
258 for (idx = oldmax; idx < newmax; idx++) {
259 imf_init(&nmfilters[idx], MCAST_UNDEFINED,
260 MCAST_EXCLUDE);
261 }
262 imo->imo_max_memberships = newmax;
263 imo->imo_membership = nmships;
264 imo->imo_mfilters = nmfilters;
265 }
266 }
267
268 if (nmships == NULL || nmfilters == NULL) {
269 if (nmships != NULL)
270 free(nmships, M_IPMOPTS);
271 if (nmfilters != NULL)
272 free(nmfilters, M_INMFILTER);
273 return (ETOOMANYREFS);
274 }
275
276 return (0);
277 }
278
279 /*
280 * Find an IPv4 multicast group entry for this ip_moptions instance
281 * which matches the specified group, and optionally an interface.
282 * Return its index into the array, or -1 if not found.
283 */
284 static size_t
285 imo_match_group(const struct ip_moptions *imo, const struct ifnet *ifp,
286 const struct sockaddr *group)
287 {
288 const struct sockaddr_in *gsin;
289 struct in_multi **pinm;
290 int idx;
291 int nmships;
292
293 gsin = (const struct sockaddr_in *)group;
294
295 /* The imo_membership array may be lazy allocated. */
296 if (imo->imo_membership == NULL || imo->imo_num_memberships == 0)
297 return (-1);
298
299 nmships = imo->imo_num_memberships;
300 pinm = &imo->imo_membership[0];
301 for (idx = 0; idx < nmships; idx++, pinm++) {
302 if (*pinm == NULL)
303 continue;
304 if ((ifp == NULL || ((*pinm)->inm_ifp == ifp)) &&
305 in_hosteq((*pinm)->inm_addr, gsin->sin_addr)) {
306 break;
307 }
308 }
309 if (idx >= nmships)
310 idx = -1;
311
312 return (idx);
313 }
314
315 /*
316 * Find an IPv4 multicast source entry for this imo which matches
317 * the given group index for this socket, and source address.
318 *
319 * NOTE: This does not check if the entry is in-mode, merely if
320 * it exists, which may not be the desired behaviour.
321 */
322 static struct in_msource *
323 imo_match_source(const struct ip_moptions *imo, const size_t gidx,
324 const struct sockaddr *src)
325 {
326 struct ip_msource find;
327 struct in_mfilter *imf;
328 struct ip_msource *ims;
329 const sockunion_t *psa;
330
331 KASSERT(src->sa_family == AF_INET, ("%s: !AF_INET", __func__));
332 KASSERT(gidx != -1 && gidx < imo->imo_num_memberships,
333 ("%s: invalid index %d\n", __func__, (int)gidx));
334
335 /* The imo_mfilters array may be lazy allocated. */
336 if (imo->imo_mfilters == NULL)
337 return (NULL);
338 imf = &imo->imo_mfilters[gidx];
339
340 /* Source trees are keyed in host byte order. */
341 psa = (const sockunion_t *)src;
342 find.ims_haddr = ntohl(psa->sin.sin_addr.s_addr);
343 ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find);
344
345 return ((struct in_msource *)ims);
346 }
347
348 /*
349 * Perform filtering for multicast datagrams on a socket by group and source.
350 *
351 * Returns 0 if a datagram should be allowed through, or various error codes
352 * if the socket was not a member of the group, or the source was muted, etc.
353 */
354 int
355 imo_multi_filter(const struct ip_moptions *imo, const struct ifnet *ifp,
356 const struct sockaddr *group, const struct sockaddr *src)
357 {
358 size_t gidx;
359 struct in_msource *ims;
360 int mode;
361
362 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
363
364 gidx = imo_match_group(imo, ifp, group);
365 if (gidx == -1)
366 return (MCAST_NOTGMEMBER);
367
368 /*
369 * Check if the source was included in an (S,G) join.
370 * Allow reception on exclusive memberships by default,
371 * reject reception on inclusive memberships by default.
372 * Exclude source only if an in-mode exclude filter exists.
373 * Include source only if an in-mode include filter exists.
374 * NOTE: We are comparing group state here at IGMP t1 (now)
375 * with socket-layer t0 (since last downcall).
376 */
377 mode = imo->imo_mfilters[gidx].imf_st[1];
378 ims = imo_match_source(imo, gidx, src);
379
380 if ((ims == NULL && mode == MCAST_INCLUDE) ||
381 (ims != NULL && ims->imsl_st[0] != mode))
382 return (MCAST_NOTSMEMBER);
383
384 return (MCAST_PASS);
385 }
386
387 /*
388 * Find and return a reference to an in_multi record for (ifp, group),
389 * and bump its reference count.
390 * If one does not exist, try to allocate it, and update link-layer multicast
391 * filters on ifp to listen for group.
392 * Assumes the IN_MULTI lock is held across the call.
393 * Return 0 if successful, otherwise return an appropriate error code.
394 */
395 static int
396 in_getmulti(struct ifnet *ifp, const struct in_addr *group,
397 struct in_multi **pinm)
398 {
399 struct sockaddr_in gsin;
400 struct ifmultiaddr *ifma;
401 struct in_ifinfo *ii;
402 struct in_multi *inm;
403 int error;
404
405 IN_MULTI_LOCK_ASSERT();
406
407 ii = (struct in_ifinfo *)ifp->if_afdata[AF_INET];
408
409 inm = inm_lookup(ifp, *group);
410 if (inm != NULL) {
411 /*
412 * If we already joined this group, just bump the
413 * refcount and return it.
414 */
415 KASSERT(inm->inm_refcount >= 1,
416 ("%s: bad refcount %d", __func__, inm->inm_refcount));
417 ++inm->inm_refcount;
418 *pinm = inm;
419 return (0);
420 }
421
422 memset(&gsin, 0, sizeof(gsin));
423 gsin.sin_family = AF_INET;
424 gsin.sin_len = sizeof(struct sockaddr_in);
425 gsin.sin_addr = *group;
426
427 /*
428 * Check if a link-layer group is already associated
429 * with this network-layer group on the given ifnet.
430 */
431 error = if_addmulti(ifp, (struct sockaddr *)&gsin, &ifma);
432 if (error != 0)
433 return (error);
434
435 /* XXX ifma_protospec must be covered by IF_ADDR_LOCK */
436 IF_ADDR_WLOCK(ifp);
437
438 /*
439 * If something other than netinet is occupying the link-layer
440 * group, print a meaningful error message and back out of
441 * the allocation.
442 * Otherwise, bump the refcount on the existing network-layer
443 * group association and return it.
444 */
445 if (ifma->ifma_protospec != NULL) {
446 inm = (struct in_multi *)ifma->ifma_protospec;
447 #ifdef INVARIANTS
448 KASSERT(ifma->ifma_addr != NULL, ("%s: no ifma_addr",
449 __func__));
450 KASSERT(ifma->ifma_addr->sa_family == AF_INET,
451 ("%s: ifma not AF_INET", __func__));
452 KASSERT(inm != NULL, ("%s: no ifma_protospec", __func__));
453 if (inm->inm_ifma != ifma || inm->inm_ifp != ifp ||
454 !in_hosteq(inm->inm_addr, *group))
455 panic("%s: ifma %p is inconsistent with %p (%s)",
456 __func__, ifma, inm, inet_ntoa(*group));
457 #endif
458 ++inm->inm_refcount;
459 *pinm = inm;
460 IF_ADDR_WUNLOCK(ifp);
461 return (0);
462 }
463
464 IF_ADDR_WLOCK_ASSERT(ifp);
465
466 /*
467 * A new in_multi record is needed; allocate and initialize it.
468 * We DO NOT perform an IGMP join as the in_ layer may need to
469 * push an initial source list down to IGMP to support SSM.
470 *
471 * The initial source filter state is INCLUDE, {} as per the RFC.
472 */
473 inm = malloc(sizeof(*inm), M_IPMADDR, M_NOWAIT | M_ZERO);
474 if (inm == NULL) {
475 if_delmulti_ifma(ifma);
476 IF_ADDR_WUNLOCK(ifp);
477 return (ENOMEM);
478 }
479 inm->inm_addr = *group;
480 inm->inm_ifp = ifp;
481 inm->inm_igi = ii->ii_igmp;
482 inm->inm_ifma = ifma;
483 inm->inm_refcount = 1;
484 inm->inm_state = IGMP_NOT_MEMBER;
485
486 /*
487 * Pending state-changes per group are subject to a bounds check.
488 */
489 IFQ_SET_MAXLEN(&inm->inm_scq, IGMP_MAX_STATE_CHANGES);
490
491 inm->inm_st[0].iss_fmode = MCAST_UNDEFINED;
492 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED;
493 RB_INIT(&inm->inm_srcs);
494
495 ifma->ifma_protospec = inm;
496
497 *pinm = inm;
498
499 IF_ADDR_WUNLOCK(ifp);
500 return (0);
501 }
502
503 /*
504 * Drop a reference to an in_multi record.
505 *
506 * If the refcount drops to 0, free the in_multi record and
507 * delete the underlying link-layer membership.
508 */
509 void
510 inm_release_locked(struct in_multi *inm)
511 {
512 struct ifmultiaddr *ifma;
513
514 IN_MULTI_LOCK_ASSERT();
515
516 CTR2(KTR_IGMPV3, "%s: refcount is %d", __func__, inm->inm_refcount);
517
518 if (--inm->inm_refcount > 0) {
519 CTR2(KTR_IGMPV3, "%s: refcount is now %d", __func__,
520 inm->inm_refcount);
521 return;
522 }
523
524 CTR2(KTR_IGMPV3, "%s: freeing inm %p", __func__, inm);
525
526 ifma = inm->inm_ifma;
527
528 /* XXX this access is not covered by IF_ADDR_LOCK */
529 CTR2(KTR_IGMPV3, "%s: purging ifma %p", __func__, ifma);
530 KASSERT(ifma->ifma_protospec == inm,
531 ("%s: ifma_protospec != inm", __func__));
532 ifma->ifma_protospec = NULL;
533
534 inm_purge(inm);
535
536 free(inm, M_IPMADDR);
537
538 if_delmulti_ifma(ifma);
539 }
540
541 /*
542 * Clear recorded source entries for a group.
543 * Used by the IGMP code. Caller must hold the IN_MULTI lock.
544 * FIXME: Should reap.
545 */
546 void
547 inm_clear_recorded(struct in_multi *inm)
548 {
549 struct ip_msource *ims;
550
551 IN_MULTI_LOCK_ASSERT();
552
553 RB_FOREACH(ims, ip_msource_tree, &inm->inm_srcs) {
554 if (ims->ims_stp) {
555 ims->ims_stp = 0;
556 --inm->inm_st[1].iss_rec;
557 }
558 }
559 KASSERT(inm->inm_st[1].iss_rec == 0,
560 ("%s: iss_rec %d not 0", __func__, inm->inm_st[1].iss_rec));
561 }
562
563 /*
564 * Record a source as pending for a Source-Group IGMPv3 query.
565 * This lives here as it modifies the shared tree.
566 *
567 * inm is the group descriptor.
568 * naddr is the address of the source to record in network-byte order.
569 *
570 * If the net.inet.igmp.sgalloc sysctl is non-zero, we will
571 * lazy-allocate a source node in response to an SG query.
572 * Otherwise, no allocation is performed. This saves some memory
573 * with the trade-off that the source will not be reported to the
574 * router if joined in the window between the query response and
575 * the group actually being joined on the local host.
576 *
577 * VIMAGE: XXX: Currently the igmp_sgalloc feature has been removed.
578 * This turns off the allocation of a recorded source entry if
579 * the group has not been joined.
580 *
581 * Return 0 if the source didn't exist or was already marked as recorded.
582 * Return 1 if the source was marked as recorded by this function.
583 * Return <0 if any error occured (negated errno code).
584 */
585 int
586 inm_record_source(struct in_multi *inm, const in_addr_t naddr)
587 {
588 struct ip_msource find;
589 struct ip_msource *ims, *nims;
590
591 IN_MULTI_LOCK_ASSERT();
592
593 find.ims_haddr = ntohl(naddr);
594 ims = RB_FIND(ip_msource_tree, &inm->inm_srcs, &find);
595 if (ims && ims->ims_stp)
596 return (0);
597 if (ims == NULL) {
598 if (inm->inm_nsrc == in_mcast_maxgrpsrc)
599 return (-ENOSPC);
600 nims = malloc(sizeof(struct ip_msource), M_IPMSOURCE,
601 M_NOWAIT | M_ZERO);
602 if (nims == NULL)
603 return (-ENOMEM);
604 nims->ims_haddr = find.ims_haddr;
605 RB_INSERT(ip_msource_tree, &inm->inm_srcs, nims);
606 ++inm->inm_nsrc;
607 ims = nims;
608 }
609
610 /*
611 * Mark the source as recorded and update the recorded
612 * source count.
613 */
614 ++ims->ims_stp;
615 ++inm->inm_st[1].iss_rec;
616
617 return (1);
618 }
619
620 /*
621 * Return a pointer to an in_msource owned by an in_mfilter,
622 * given its source address.
623 * Lazy-allocate if needed. If this is a new entry its filter state is
624 * undefined at t0.
625 *
626 * imf is the filter set being modified.
627 * haddr is the source address in *host* byte-order.
628 *
629 * SMPng: May be called with locks held; malloc must not block.
630 */
631 static int
632 imf_get_source(struct in_mfilter *imf, const struct sockaddr_in *psin,
633 struct in_msource **plims)
634 {
635 struct ip_msource find;
636 struct ip_msource *ims, *nims;
637 struct in_msource *lims;
638 int error;
639
640 error = 0;
641 ims = NULL;
642 lims = NULL;
643
644 /* key is host byte order */
645 find.ims_haddr = ntohl(psin->sin_addr.s_addr);
646 ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find);
647 lims = (struct in_msource *)ims;
648 if (lims == NULL) {
649 if (imf->imf_nsrc == in_mcast_maxsocksrc)
650 return (ENOSPC);
651 nims = malloc(sizeof(struct in_msource), M_INMFILTER,
652 M_NOWAIT | M_ZERO);
653 if (nims == NULL)
654 return (ENOMEM);
655 lims = (struct in_msource *)nims;
656 lims->ims_haddr = find.ims_haddr;
657 lims->imsl_st[0] = MCAST_UNDEFINED;
658 RB_INSERT(ip_msource_tree, &imf->imf_sources, nims);
659 ++imf->imf_nsrc;
660 }
661
662 *plims = lims;
663
664 return (error);
665 }
666
667 /*
668 * Graft a source entry into an existing socket-layer filter set,
669 * maintaining any required invariants and checking allocations.
670 *
671 * The source is marked as being in the new filter mode at t1.
672 *
673 * Return the pointer to the new node, otherwise return NULL.
674 */
675 static struct in_msource *
676 imf_graft(struct in_mfilter *imf, const uint8_t st1,
677 const struct sockaddr_in *psin)
678 {
679 struct ip_msource *nims;
680 struct in_msource *lims;
681
682 nims = malloc(sizeof(struct in_msource), M_INMFILTER,
683 M_NOWAIT | M_ZERO);
684 if (nims == NULL)
685 return (NULL);
686 lims = (struct in_msource *)nims;
687 lims->ims_haddr = ntohl(psin->sin_addr.s_addr);
688 lims->imsl_st[0] = MCAST_UNDEFINED;
689 lims->imsl_st[1] = st1;
690 RB_INSERT(ip_msource_tree, &imf->imf_sources, nims);
691 ++imf->imf_nsrc;
692
693 return (lims);
694 }
695
696 /*
697 * Prune a source entry from an existing socket-layer filter set,
698 * maintaining any required invariants and checking allocations.
699 *
700 * The source is marked as being left at t1, it is not freed.
701 *
702 * Return 0 if no error occurred, otherwise return an errno value.
703 */
704 static int
705 imf_prune(struct in_mfilter *imf, const struct sockaddr_in *psin)
706 {
707 struct ip_msource find;
708 struct ip_msource *ims;
709 struct in_msource *lims;
710
711 /* key is host byte order */
712 find.ims_haddr = ntohl(psin->sin_addr.s_addr);
713 ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find);
714 if (ims == NULL)
715 return (ENOENT);
716 lims = (struct in_msource *)ims;
717 lims->imsl_st[1] = MCAST_UNDEFINED;
718 return (0);
719 }
720
721 /*
722 * Revert socket-layer filter set deltas at t1 to t0 state.
723 */
724 static void
725 imf_rollback(struct in_mfilter *imf)
726 {
727 struct ip_msource *ims, *tims;
728 struct in_msource *lims;
729
730 RB_FOREACH_SAFE(ims, ip_msource_tree, &imf->imf_sources, tims) {
731 lims = (struct in_msource *)ims;
732 if (lims->imsl_st[0] == lims->imsl_st[1]) {
733 /* no change at t1 */
734 continue;
735 } else if (lims->imsl_st[0] != MCAST_UNDEFINED) {
736 /* revert change to existing source at t1 */
737 lims->imsl_st[1] = lims->imsl_st[0];
738 } else {
739 /* revert source added t1 */
740 CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims);
741 RB_REMOVE(ip_msource_tree, &imf->imf_sources, ims);
742 free(ims, M_INMFILTER);
743 imf->imf_nsrc--;
744 }
745 }
746 imf->imf_st[1] = imf->imf_st[0];
747 }
748
749 /*
750 * Mark socket-layer filter set as INCLUDE {} at t1.
751 */
752 static void
753 imf_leave(struct in_mfilter *imf)
754 {
755 struct ip_msource *ims;
756 struct in_msource *lims;
757
758 RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) {
759 lims = (struct in_msource *)ims;
760 lims->imsl_st[1] = MCAST_UNDEFINED;
761 }
762 imf->imf_st[1] = MCAST_INCLUDE;
763 }
764
765 /*
766 * Mark socket-layer filter set deltas as committed.
767 */
768 static void
769 imf_commit(struct in_mfilter *imf)
770 {
771 struct ip_msource *ims;
772 struct in_msource *lims;
773
774 RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) {
775 lims = (struct in_msource *)ims;
776 lims->imsl_st[0] = lims->imsl_st[1];
777 }
778 imf->imf_st[0] = imf->imf_st[1];
779 }
780
781 /*
782 * Reap unreferenced sources from socket-layer filter set.
783 */
784 static void
785 imf_reap(struct in_mfilter *imf)
786 {
787 struct ip_msource *ims, *tims;
788 struct in_msource *lims;
789
790 RB_FOREACH_SAFE(ims, ip_msource_tree, &imf->imf_sources, tims) {
791 lims = (struct in_msource *)ims;
792 if ((lims->imsl_st[0] == MCAST_UNDEFINED) &&
793 (lims->imsl_st[1] == MCAST_UNDEFINED)) {
794 CTR2(KTR_IGMPV3, "%s: free lims %p", __func__, ims);
795 RB_REMOVE(ip_msource_tree, &imf->imf_sources, ims);
796 free(ims, M_INMFILTER);
797 imf->imf_nsrc--;
798 }
799 }
800 }
801
802 /*
803 * Purge socket-layer filter set.
804 */
805 static void
806 imf_purge(struct in_mfilter *imf)
807 {
808 struct ip_msource *ims, *tims;
809
810 RB_FOREACH_SAFE(ims, ip_msource_tree, &imf->imf_sources, tims) {
811 CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims);
812 RB_REMOVE(ip_msource_tree, &imf->imf_sources, ims);
813 free(ims, M_INMFILTER);
814 imf->imf_nsrc--;
815 }
816 imf->imf_st[0] = imf->imf_st[1] = MCAST_UNDEFINED;
817 KASSERT(RB_EMPTY(&imf->imf_sources),
818 ("%s: imf_sources not empty", __func__));
819 }
820
821 /*
822 * Look up a source filter entry for a multicast group.
823 *
824 * inm is the group descriptor to work with.
825 * haddr is the host-byte-order IPv4 address to look up.
826 * noalloc may be non-zero to suppress allocation of sources.
827 * *pims will be set to the address of the retrieved or allocated source.
828 *
829 * SMPng: NOTE: may be called with locks held.
830 * Return 0 if successful, otherwise return a non-zero error code.
831 */
832 static int
833 inm_get_source(struct in_multi *inm, const in_addr_t haddr,
834 const int noalloc, struct ip_msource **pims)
835 {
836 struct ip_msource find;
837 struct ip_msource *ims, *nims;
838 #ifdef KTR
839 struct in_addr ia;
840 #endif
841
842 find.ims_haddr = haddr;
843 ims = RB_FIND(ip_msource_tree, &inm->inm_srcs, &find);
844 if (ims == NULL && !noalloc) {
845 if (inm->inm_nsrc == in_mcast_maxgrpsrc)
846 return (ENOSPC);
847 nims = malloc(sizeof(struct ip_msource), M_IPMSOURCE,
848 M_NOWAIT | M_ZERO);
849 if (nims == NULL)
850 return (ENOMEM);
851 nims->ims_haddr = haddr;
852 RB_INSERT(ip_msource_tree, &inm->inm_srcs, nims);
853 ++inm->inm_nsrc;
854 ims = nims;
855 #ifdef KTR
856 ia.s_addr = htonl(haddr);
857 CTR3(KTR_IGMPV3, "%s: allocated %s as %p", __func__,
858 inet_ntoa(ia), ims);
859 #endif
860 }
861
862 *pims = ims;
863 return (0);
864 }
865
866 /*
867 * Merge socket-layer source into IGMP-layer source.
868 * If rollback is non-zero, perform the inverse of the merge.
869 */
870 static void
871 ims_merge(struct ip_msource *ims, const struct in_msource *lims,
872 const int rollback)
873 {
874 int n = rollback ? -1 : 1;
875 #ifdef KTR
876 struct in_addr ia;
877
878 ia.s_addr = htonl(ims->ims_haddr);
879 #endif
880
881 if (lims->imsl_st[0] == MCAST_EXCLUDE) {
882 CTR3(KTR_IGMPV3, "%s: t1 ex -= %d on %s",
883 __func__, n, inet_ntoa(ia));
884 ims->ims_st[1].ex -= n;
885 } else if (lims->imsl_st[0] == MCAST_INCLUDE) {
886 CTR3(KTR_IGMPV3, "%s: t1 in -= %d on %s",
887 __func__, n, inet_ntoa(ia));
888 ims->ims_st[1].in -= n;
889 }
890
891 if (lims->imsl_st[1] == MCAST_EXCLUDE) {
892 CTR3(KTR_IGMPV3, "%s: t1 ex += %d on %s",
893 __func__, n, inet_ntoa(ia));
894 ims->ims_st[1].ex += n;
895 } else if (lims->imsl_st[1] == MCAST_INCLUDE) {
896 CTR3(KTR_IGMPV3, "%s: t1 in += %d on %s",
897 __func__, n, inet_ntoa(ia));
898 ims->ims_st[1].in += n;
899 }
900 }
901
902 /*
903 * Atomically update the global in_multi state, when a membership's
904 * filter list is being updated in any way.
905 *
906 * imf is the per-inpcb-membership group filter pointer.
907 * A fake imf may be passed for in-kernel consumers.
908 *
909 * XXX This is a candidate for a set-symmetric-difference style loop
910 * which would eliminate the repeated lookup from root of ims nodes,
911 * as they share the same key space.
912 *
913 * If any error occurred this function will back out of refcounts
914 * and return a non-zero value.
915 */
916 static int
917 inm_merge(struct in_multi *inm, /*const*/ struct in_mfilter *imf)
918 {
919 struct ip_msource *ims, *nims;
920 struct in_msource *lims;
921 int schanged, error;
922 int nsrc0, nsrc1;
923
924 schanged = 0;
925 error = 0;
926 nsrc1 = nsrc0 = 0;
927
928 /*
929 * Update the source filters first, as this may fail.
930 * Maintain count of in-mode filters at t0, t1. These are
931 * used to work out if we transition into ASM mode or not.
932 * Maintain a count of source filters whose state was
933 * actually modified by this operation.
934 */
935 RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) {
936 lims = (struct in_msource *)ims;
937 if (lims->imsl_st[0] == imf->imf_st[0]) nsrc0++;
938 if (lims->imsl_st[1] == imf->imf_st[1]) nsrc1++;
939 if (lims->imsl_st[0] == lims->imsl_st[1]) continue;
940 error = inm_get_source(inm, lims->ims_haddr, 0, &nims);
941 ++schanged;
942 if (error)
943 break;
944 ims_merge(nims, lims, 0);
945 }
946 if (error) {
947 struct ip_msource *bims;
948
949 RB_FOREACH_REVERSE_FROM(ims, ip_msource_tree, nims) {
950 lims = (struct in_msource *)ims;
951 if (lims->imsl_st[0] == lims->imsl_st[1])
952 continue;
953 (void)inm_get_source(inm, lims->ims_haddr, 1, &bims);
954 if (bims == NULL)
955 continue;
956 ims_merge(bims, lims, 1);
957 }
958 goto out_reap;
959 }
960
961 CTR3(KTR_IGMPV3, "%s: imf filters in-mode: %d at t0, %d at t1",
962 __func__, nsrc0, nsrc1);
963
964 /* Handle transition between INCLUDE {n} and INCLUDE {} on socket. */
965 if (imf->imf_st[0] == imf->imf_st[1] &&
966 imf->imf_st[1] == MCAST_INCLUDE) {
967 if (nsrc1 == 0) {
968 CTR1(KTR_IGMPV3, "%s: --in on inm at t1", __func__);
969 --inm->inm_st[1].iss_in;
970 }
971 }
972
973 /* Handle filter mode transition on socket. */
974 if (imf->imf_st[0] != imf->imf_st[1]) {
975 CTR3(KTR_IGMPV3, "%s: imf transition %d to %d",
976 __func__, imf->imf_st[0], imf->imf_st[1]);
977
978 if (imf->imf_st[0] == MCAST_EXCLUDE) {
979 CTR1(KTR_IGMPV3, "%s: --ex on inm at t1", __func__);
980 --inm->inm_st[1].iss_ex;
981 } else if (imf->imf_st[0] == MCAST_INCLUDE) {
982 CTR1(KTR_IGMPV3, "%s: --in on inm at t1", __func__);
983 --inm->inm_st[1].iss_in;
984 }
985
986 if (imf->imf_st[1] == MCAST_EXCLUDE) {
987 CTR1(KTR_IGMPV3, "%s: ex++ on inm at t1", __func__);
988 inm->inm_st[1].iss_ex++;
989 } else if (imf->imf_st[1] == MCAST_INCLUDE && nsrc1 > 0) {
990 CTR1(KTR_IGMPV3, "%s: in++ on inm at t1", __func__);
991 inm->inm_st[1].iss_in++;
992 }
993 }
994
995 /*
996 * Track inm filter state in terms of listener counts.
997 * If there are any exclusive listeners, stack-wide
998 * membership is exclusive.
999 * Otherwise, if only inclusive listeners, stack-wide is inclusive.
1000 * If no listeners remain, state is undefined at t1,
1001 * and the IGMP lifecycle for this group should finish.
1002 */
1003 if (inm->inm_st[1].iss_ex > 0) {
1004 CTR1(KTR_IGMPV3, "%s: transition to EX", __func__);
1005 inm->inm_st[1].iss_fmode = MCAST_EXCLUDE;
1006 } else if (inm->inm_st[1].iss_in > 0) {
1007 CTR1(KTR_IGMPV3, "%s: transition to IN", __func__);
1008 inm->inm_st[1].iss_fmode = MCAST_INCLUDE;
1009 } else {
1010 CTR1(KTR_IGMPV3, "%s: transition to UNDEF", __func__);
1011 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED;
1012 }
1013
1014 /* Decrement ASM listener count on transition out of ASM mode. */
1015 if (imf->imf_st[0] == MCAST_EXCLUDE && nsrc0 == 0) {
1016 if ((imf->imf_st[1] != MCAST_EXCLUDE) ||
1017 (imf->imf_st[1] == MCAST_EXCLUDE && nsrc1 > 0)) {
1018 CTR1(KTR_IGMPV3, "%s: --asm on inm at t1", __func__);
1019 --inm->inm_st[1].iss_asm;
1020 }
1021 }
1022
1023 /* Increment ASM listener count on transition to ASM mode. */
1024 if (imf->imf_st[1] == MCAST_EXCLUDE && nsrc1 == 0) {
1025 CTR1(KTR_IGMPV3, "%s: asm++ on inm at t1", __func__);
1026 inm->inm_st[1].iss_asm++;
1027 }
1028
1029 CTR3(KTR_IGMPV3, "%s: merged imf %p to inm %p", __func__, imf, inm);
1030 inm_print(inm);
1031
1032 out_reap:
1033 if (schanged > 0) {
1034 CTR1(KTR_IGMPV3, "%s: sources changed; reaping", __func__);
1035 inm_reap(inm);
1036 }
1037 return (error);
1038 }
1039
1040 /*
1041 * Mark an in_multi's filter set deltas as committed.
1042 * Called by IGMP after a state change has been enqueued.
1043 */
1044 void
1045 inm_commit(struct in_multi *inm)
1046 {
1047 struct ip_msource *ims;
1048
1049 CTR2(KTR_IGMPV3, "%s: commit inm %p", __func__, inm);
1050 CTR1(KTR_IGMPV3, "%s: pre commit:", __func__);
1051 inm_print(inm);
1052
1053 RB_FOREACH(ims, ip_msource_tree, &inm->inm_srcs) {
1054 ims->ims_st[0] = ims->ims_st[1];
1055 }
1056 inm->inm_st[0] = inm->inm_st[1];
1057 }
1058
1059 /*
1060 * Reap unreferenced nodes from an in_multi's filter set.
1061 */
1062 static void
1063 inm_reap(struct in_multi *inm)
1064 {
1065 struct ip_msource *ims, *tims;
1066
1067 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, tims) {
1068 if (ims->ims_st[0].ex > 0 || ims->ims_st[0].in > 0 ||
1069 ims->ims_st[1].ex > 0 || ims->ims_st[1].in > 0 ||
1070 ims->ims_stp != 0)
1071 continue;
1072 CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims);
1073 RB_REMOVE(ip_msource_tree, &inm->inm_srcs, ims);
1074 free(ims, M_IPMSOURCE);
1075 inm->inm_nsrc--;
1076 }
1077 }
1078
1079 /*
1080 * Purge all source nodes from an in_multi's filter set.
1081 */
1082 static void
1083 inm_purge(struct in_multi *inm)
1084 {
1085 struct ip_msource *ims, *tims;
1086
1087 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, tims) {
1088 CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims);
1089 RB_REMOVE(ip_msource_tree, &inm->inm_srcs, ims);
1090 free(ims, M_IPMSOURCE);
1091 inm->inm_nsrc--;
1092 }
1093 }
1094
1095 /*
1096 * Join a multicast group; unlocked entry point.
1097 *
1098 * SMPng: XXX: in_joingroup() is called from in_control() when Giant
1099 * is not held. Fortunately, ifp is unlikely to have been detached
1100 * at this point, so we assume it's OK to recurse.
1101 */
1102 int
1103 in_joingroup(struct ifnet *ifp, const struct in_addr *gina,
1104 /*const*/ struct in_mfilter *imf, struct in_multi **pinm)
1105 {
1106 int error;
1107
1108 IN_MULTI_LOCK();
1109 error = in_joingroup_locked(ifp, gina, imf, pinm);
1110 IN_MULTI_UNLOCK();
1111
1112 return (error);
1113 }
1114
1115 /*
1116 * Join a multicast group; real entry point.
1117 *
1118 * Only preserves atomicity at inm level.
1119 * NOTE: imf argument cannot be const due to sys/tree.h limitations.
1120 *
1121 * If the IGMP downcall fails, the group is not joined, and an error
1122 * code is returned.
1123 */
1124 int
1125 in_joingroup_locked(struct ifnet *ifp, const struct in_addr *gina,
1126 /*const*/ struct in_mfilter *imf, struct in_multi **pinm)
1127 {
1128 struct in_mfilter timf;
1129 struct in_multi *inm;
1130 int error;
1131
1132 IN_MULTI_LOCK_ASSERT();
1133
1134 CTR4(KTR_IGMPV3, "%s: join %s on %p(%s))", __func__,
1135 inet_ntoa(*gina), ifp, ifp->if_xname);
1136
1137 error = 0;
1138 inm = NULL;
1139
1140 /*
1141 * If no imf was specified (i.e. kernel consumer),
1142 * fake one up and assume it is an ASM join.
1143 */
1144 if (imf == NULL) {
1145 imf_init(&timf, MCAST_UNDEFINED, MCAST_EXCLUDE);
1146 imf = &timf;
1147 }
1148
1149 error = in_getmulti(ifp, gina, &inm);
1150 if (error) {
1151 CTR1(KTR_IGMPV3, "%s: in_getmulti() failure", __func__);
1152 return (error);
1153 }
1154
1155 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
1156 error = inm_merge(inm, imf);
1157 if (error) {
1158 CTR1(KTR_IGMPV3, "%s: failed to merge inm state", __func__);
1159 goto out_inm_release;
1160 }
1161
1162 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
1163 error = igmp_change_state(inm);
1164 if (error) {
1165 CTR1(KTR_IGMPV3, "%s: failed to update source", __func__);
1166 goto out_inm_release;
1167 }
1168
1169 out_inm_release:
1170 if (error) {
1171 CTR2(KTR_IGMPV3, "%s: dropping ref on %p", __func__, inm);
1172 inm_release_locked(inm);
1173 } else {
1174 *pinm = inm;
1175 }
1176
1177 return (error);
1178 }
1179
1180 /*
1181 * Leave a multicast group; unlocked entry point.
1182 */
1183 int
1184 in_leavegroup(struct in_multi *inm, /*const*/ struct in_mfilter *imf)
1185 {
1186 int error;
1187
1188 IN_MULTI_LOCK();
1189 error = in_leavegroup_locked(inm, imf);
1190 IN_MULTI_UNLOCK();
1191
1192 return (error);
1193 }
1194
1195 /*
1196 * Leave a multicast group; real entry point.
1197 * All source filters will be expunged.
1198 *
1199 * Only preserves atomicity at inm level.
1200 *
1201 * Holding the write lock for the INP which contains imf
1202 * is highly advisable. We can't assert for it as imf does not
1203 * contain a back-pointer to the owning inp.
1204 *
1205 * Note: This is not the same as inm_release(*) as this function also
1206 * makes a state change downcall into IGMP.
1207 */
1208 int
1209 in_leavegroup_locked(struct in_multi *inm, /*const*/ struct in_mfilter *imf)
1210 {
1211 struct in_mfilter timf;
1212 int error;
1213
1214 error = 0;
1215
1216 IN_MULTI_LOCK_ASSERT();
1217
1218 CTR5(KTR_IGMPV3, "%s: leave inm %p, %s/%s, imf %p", __func__,
1219 inm, inet_ntoa(inm->inm_addr),
1220 (inm_is_ifp_detached(inm) ? "null" : inm->inm_ifp->if_xname),
1221 imf);
1222
1223 /*
1224 * If no imf was specified (i.e. kernel consumer),
1225 * fake one up and assume it is an ASM join.
1226 */
1227 if (imf == NULL) {
1228 imf_init(&timf, MCAST_EXCLUDE, MCAST_UNDEFINED);
1229 imf = &timf;
1230 }
1231
1232 /*
1233 * Begin state merge transaction at IGMP layer.
1234 *
1235 * As this particular invocation should not cause any memory
1236 * to be allocated, and there is no opportunity to roll back
1237 * the transaction, it MUST NOT fail.
1238 */
1239 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
1240 error = inm_merge(inm, imf);
1241 KASSERT(error == 0, ("%s: failed to merge inm state", __func__));
1242
1243 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
1244 CURVNET_SET(inm->inm_ifp->if_vnet);
1245 error = igmp_change_state(inm);
1246 CURVNET_RESTORE();
1247 if (error)
1248 CTR1(KTR_IGMPV3, "%s: failed igmp downcall", __func__);
1249
1250 CTR2(KTR_IGMPV3, "%s: dropping ref on %p", __func__, inm);
1251 inm_release_locked(inm);
1252
1253 return (error);
1254 }
1255
1256 /*#ifndef BURN_BRIDGES*/
1257 /*
1258 * Join an IPv4 multicast group in (*,G) exclusive mode.
1259 * The group must be a 224.0.0.0/24 link-scope group.
1260 * This KPI is for legacy kernel consumers only.
1261 */
1262 struct in_multi *
1263 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1264 {
1265 struct in_multi *pinm;
1266 int error;
1267
1268 KASSERT(IN_LOCAL_GROUP(ntohl(ap->s_addr)),
1269 ("%s: %s not in 224.0.0.0/24", __func__, inet_ntoa(*ap)));
1270
1271 error = in_joingroup(ifp, ap, NULL, &pinm);
1272 if (error != 0)
1273 pinm = NULL;
1274
1275 return (pinm);
1276 }
1277
1278 /*
1279 * Leave an IPv4 multicast group, assumed to be in exclusive (*,G) mode.
1280 * This KPI is for legacy kernel consumers only.
1281 */
1282 void
1283 in_delmulti(struct in_multi *inm)
1284 {
1285
1286 (void)in_leavegroup(inm, NULL);
1287 }
1288 /*#endif*/
1289
1290 /*
1291 * Block or unblock an ASM multicast source on an inpcb.
1292 * This implements the delta-based API described in RFC 3678.
1293 *
1294 * The delta-based API applies only to exclusive-mode memberships.
1295 * An IGMP downcall will be performed.
1296 *
1297 * SMPng: NOTE: Must take Giant as a join may create a new ifma.
1298 *
1299 * Return 0 if successful, otherwise return an appropriate error code.
1300 */
1301 static int
1302 inp_block_unblock_source(struct inpcb *inp, struct sockopt *sopt)
1303 {
1304 struct group_source_req gsr;
1305 sockunion_t *gsa, *ssa;
1306 struct ifnet *ifp;
1307 struct in_mfilter *imf;
1308 struct ip_moptions *imo;
1309 struct in_msource *ims;
1310 struct in_multi *inm;
1311 size_t idx;
1312 uint16_t fmode;
1313 int error, doblock;
1314
1315 ifp = NULL;
1316 error = 0;
1317 doblock = 0;
1318
1319 memset(&gsr, 0, sizeof(struct group_source_req));
1320 gsa = (sockunion_t *)&gsr.gsr_group;
1321 ssa = (sockunion_t *)&gsr.gsr_source;
1322
1323 switch (sopt->sopt_name) {
1324 case IP_BLOCK_SOURCE:
1325 case IP_UNBLOCK_SOURCE: {
1326 struct ip_mreq_source mreqs;
1327
1328 error = sooptcopyin(sopt, &mreqs,
1329 sizeof(struct ip_mreq_source),
1330 sizeof(struct ip_mreq_source));
1331 if (error)
1332 return (error);
1333
1334 gsa->sin.sin_family = AF_INET;
1335 gsa->sin.sin_len = sizeof(struct sockaddr_in);
1336 gsa->sin.sin_addr = mreqs.imr_multiaddr;
1337
1338 ssa->sin.sin_family = AF_INET;
1339 ssa->sin.sin_len = sizeof(struct sockaddr_in);
1340 ssa->sin.sin_addr = mreqs.imr_sourceaddr;
1341
1342 if (!in_nullhost(mreqs.imr_interface)) {
1343 IN_IFADDR_RLOCK();
1344 INADDR_TO_IFP(mreqs.imr_interface, ifp);
1345 IN_IFADDR_RUNLOCK();
1346 }
1347 if (sopt->sopt_name == IP_BLOCK_SOURCE)
1348 doblock = 1;
1349
1350 CTR3(KTR_IGMPV3, "%s: imr_interface = %s, ifp = %p",
1351 __func__, inet_ntoa(mreqs.imr_interface), ifp);
1352 break;
1353 }
1354
1355 case MCAST_BLOCK_SOURCE:
1356 case MCAST_UNBLOCK_SOURCE:
1357 error = sooptcopyin(sopt, &gsr,
1358 sizeof(struct group_source_req),
1359 sizeof(struct group_source_req));
1360 if (error)
1361 return (error);
1362
1363 if (gsa->sin.sin_family != AF_INET ||
1364 gsa->sin.sin_len != sizeof(struct sockaddr_in))
1365 return (EINVAL);
1366
1367 if (ssa->sin.sin_family != AF_INET ||
1368 ssa->sin.sin_len != sizeof(struct sockaddr_in))
1369 return (EINVAL);
1370
1371 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1372 return (EADDRNOTAVAIL);
1373
1374 ifp = ifnet_byindex(gsr.gsr_interface);
1375
1376 if (sopt->sopt_name == MCAST_BLOCK_SOURCE)
1377 doblock = 1;
1378 break;
1379
1380 default:
1381 CTR2(KTR_IGMPV3, "%s: unknown sopt_name %d",
1382 __func__, sopt->sopt_name);
1383 return (EOPNOTSUPP);
1384 break;
1385 }
1386
1387 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
1388 return (EINVAL);
1389
1390 /*
1391 * Check if we are actually a member of this group.
1392 */
1393 imo = inp_findmoptions(inp);
1394 idx = imo_match_group(imo, ifp, &gsa->sa);
1395 if (idx == -1 || imo->imo_mfilters == NULL) {
1396 error = EADDRNOTAVAIL;
1397 goto out_inp_locked;
1398 }
1399
1400 KASSERT(imo->imo_mfilters != NULL,
1401 ("%s: imo_mfilters not allocated", __func__));
1402 imf = &imo->imo_mfilters[idx];
1403 inm = imo->imo_membership[idx];
1404
1405 /*
1406 * Attempting to use the delta-based API on an
1407 * non exclusive-mode membership is an error.
1408 */
1409 fmode = imf->imf_st[0];
1410 if (fmode != MCAST_EXCLUDE) {
1411 error = EINVAL;
1412 goto out_inp_locked;
1413 }
1414
1415 /*
1416 * Deal with error cases up-front:
1417 * Asked to block, but already blocked; or
1418 * Asked to unblock, but nothing to unblock.
1419 * If adding a new block entry, allocate it.
1420 */
1421 ims = imo_match_source(imo, idx, &ssa->sa);
1422 if ((ims != NULL && doblock) || (ims == NULL && !doblock)) {
1423 CTR3(KTR_IGMPV3, "%s: source %s %spresent", __func__,
1424 inet_ntoa(ssa->sin.sin_addr), doblock ? "" : "not ");
1425 error = EADDRNOTAVAIL;
1426 goto out_inp_locked;
1427 }
1428
1429 INP_WLOCK_ASSERT(inp);
1430
1431 /*
1432 * Begin state merge transaction at socket layer.
1433 */
1434 if (doblock) {
1435 CTR2(KTR_IGMPV3, "%s: %s source", __func__, "block");
1436 ims = imf_graft(imf, fmode, &ssa->sin);
1437 if (ims == NULL)
1438 error = ENOMEM;
1439 } else {
1440 CTR2(KTR_IGMPV3, "%s: %s source", __func__, "allow");
1441 error = imf_prune(imf, &ssa->sin);
1442 }
1443
1444 if (error) {
1445 CTR1(KTR_IGMPV3, "%s: merge imf state failed", __func__);
1446 goto out_imf_rollback;
1447 }
1448
1449 /*
1450 * Begin state merge transaction at IGMP layer.
1451 */
1452 IN_MULTI_LOCK();
1453
1454 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
1455 error = inm_merge(inm, imf);
1456 if (error) {
1457 CTR1(KTR_IGMPV3, "%s: failed to merge inm state", __func__);
1458 goto out_in_multi_locked;
1459 }
1460
1461 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
1462 error = igmp_change_state(inm);
1463 if (error)
1464 CTR1(KTR_IGMPV3, "%s: failed igmp downcall", __func__);
1465
1466 out_in_multi_locked:
1467
1468 IN_MULTI_UNLOCK();
1469
1470 out_imf_rollback:
1471 if (error)
1472 imf_rollback(imf);
1473 else
1474 imf_commit(imf);
1475
1476 imf_reap(imf);
1477
1478 out_inp_locked:
1479 INP_WUNLOCK(inp);
1480 return (error);
1481 }
1482
1483 /*
1484 * Given an inpcb, return its multicast options structure pointer. Accepts
1485 * an unlocked inpcb pointer, but will return it locked. May sleep.
1486 *
1487 * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
1488 * SMPng: NOTE: Returns with the INP write lock held.
1489 */
1490 static struct ip_moptions *
1491 inp_findmoptions(struct inpcb *inp)
1492 {
1493 struct ip_moptions *imo;
1494 struct in_multi **immp;
1495 struct in_mfilter *imfp;
1496 size_t idx;
1497
1498 INP_WLOCK(inp);
1499 if (inp->inp_moptions != NULL)
1500 return (inp->inp_moptions);
1501
1502 INP_WUNLOCK(inp);
1503
1504 imo = malloc(sizeof(*imo), M_IPMOPTS, M_WAITOK);
1505 immp = malloc(sizeof(*immp) * IP_MIN_MEMBERSHIPS, M_IPMOPTS,
1506 M_WAITOK | M_ZERO);
1507 imfp = malloc(sizeof(struct in_mfilter) * IP_MIN_MEMBERSHIPS,
1508 M_INMFILTER, M_WAITOK);
1509
1510 imo->imo_multicast_ifp = NULL;
1511 imo->imo_multicast_addr.s_addr = INADDR_ANY;
1512 imo->imo_multicast_vif = -1;
1513 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
1514 imo->imo_multicast_loop = in_mcast_loop;
1515 imo->imo_num_memberships = 0;
1516 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS;
1517 imo->imo_membership = immp;
1518
1519 /* Initialize per-group source filters. */
1520 for (idx = 0; idx < IP_MIN_MEMBERSHIPS; idx++)
1521 imf_init(&imfp[idx], MCAST_UNDEFINED, MCAST_EXCLUDE);
1522 imo->imo_mfilters = imfp;
1523
1524 INP_WLOCK(inp);
1525 if (inp->inp_moptions != NULL) {
1526 free(imfp, M_INMFILTER);
1527 free(immp, M_IPMOPTS);
1528 free(imo, M_IPMOPTS);
1529 return (inp->inp_moptions);
1530 }
1531 inp->inp_moptions = imo;
1532 return (imo);
1533 }
1534
1535 /*
1536 * Discard the IP multicast options (and source filters). To minimize
1537 * the amount of work done while holding locks such as the INP's
1538 * pcbinfo lock (which is used in the receive path), the free
1539 * operation is performed asynchronously in a separate task.
1540 *
1541 * SMPng: NOTE: assumes INP write lock is held.
1542 */
1543 void
1544 inp_freemoptions(struct ip_moptions *imo)
1545 {
1546
1547 KASSERT(imo != NULL, ("%s: ip_moptions is NULL", __func__));
1548 IN_MULTI_LOCK();
1549 STAILQ_INSERT_TAIL(&imo_gc_list, imo, imo_link);
1550 IN_MULTI_UNLOCK();
1551 taskqueue_enqueue(taskqueue_thread, &imo_gc_task);
1552 }
1553
1554 static void
1555 inp_freemoptions_internal(struct ip_moptions *imo)
1556 {
1557 struct in_mfilter *imf;
1558 size_t idx, nmships;
1559
1560 nmships = imo->imo_num_memberships;
1561 for (idx = 0; idx < nmships; ++idx) {
1562 imf = imo->imo_mfilters ? &imo->imo_mfilters[idx] : NULL;
1563 if (imf)
1564 imf_leave(imf);
1565 (void)in_leavegroup(imo->imo_membership[idx], imf);
1566 if (imf)
1567 imf_purge(imf);
1568 }
1569
1570 if (imo->imo_mfilters)
1571 free(imo->imo_mfilters, M_INMFILTER);
1572 free(imo->imo_membership, M_IPMOPTS);
1573 free(imo, M_IPMOPTS);
1574 }
1575
1576 static void
1577 inp_gcmoptions(void *context, int pending)
1578 {
1579 struct ip_moptions *imo;
1580
1581 IN_MULTI_LOCK();
1582 while (!STAILQ_EMPTY(&imo_gc_list)) {
1583 imo = STAILQ_FIRST(&imo_gc_list);
1584 STAILQ_REMOVE_HEAD(&imo_gc_list, imo_link);
1585 IN_MULTI_UNLOCK();
1586 inp_freemoptions_internal(imo);
1587 IN_MULTI_LOCK();
1588 }
1589 IN_MULTI_UNLOCK();
1590 }
1591
1592 /*
1593 * Atomically get source filters on a socket for an IPv4 multicast group.
1594 * Called with INP lock held; returns with lock released.
1595 */
1596 static int
1597 inp_get_source_filters(struct inpcb *inp, struct sockopt *sopt)
1598 {
1599 struct __msfilterreq msfr;
1600 sockunion_t *gsa;
1601 struct ifnet *ifp;
1602 struct ip_moptions *imo;
1603 struct in_mfilter *imf;
1604 struct ip_msource *ims;
1605 struct in_msource *lims;
1606 struct sockaddr_in *psin;
1607 struct sockaddr_storage *ptss;
1608 struct sockaddr_storage *tss;
1609 int error;
1610 size_t idx, nsrcs, ncsrcs;
1611
1612 INP_WLOCK_ASSERT(inp);
1613
1614 imo = inp->inp_moptions;
1615 KASSERT(imo != NULL, ("%s: null ip_moptions", __func__));
1616
1617 INP_WUNLOCK(inp);
1618
1619 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
1620 sizeof(struct __msfilterreq));
1621 if (error)
1622 return (error);
1623
1624 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
1625 return (EINVAL);
1626
1627 ifp = ifnet_byindex(msfr.msfr_ifindex);
1628 if (ifp == NULL)
1629 return (EINVAL);
1630
1631 INP_WLOCK(inp);
1632
1633 /*
1634 * Lookup group on the socket.
1635 */
1636 gsa = (sockunion_t *)&msfr.msfr_group;
1637 idx = imo_match_group(imo, ifp, &gsa->sa);
1638 if (idx == -1 || imo->imo_mfilters == NULL) {
1639 INP_WUNLOCK(inp);
1640 return (EADDRNOTAVAIL);
1641 }
1642 imf = &imo->imo_mfilters[idx];
1643
1644 /*
1645 * Ignore memberships which are in limbo.
1646 */
1647 if (imf->imf_st[1] == MCAST_UNDEFINED) {
1648 INP_WUNLOCK(inp);
1649 return (EAGAIN);
1650 }
1651 msfr.msfr_fmode = imf->imf_st[1];
1652
1653 /*
1654 * If the user specified a buffer, copy out the source filter
1655 * entries to userland gracefully.
1656 * We only copy out the number of entries which userland
1657 * has asked for, but we always tell userland how big the
1658 * buffer really needs to be.
1659 */
1660 if (msfr.msfr_nsrcs > in_mcast_maxsocksrc)
1661 msfr.msfr_nsrcs = in_mcast_maxsocksrc;
1662 tss = NULL;
1663 if (msfr.msfr_srcs != NULL && msfr.msfr_nsrcs > 0) {
1664 tss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
1665 M_TEMP, M_NOWAIT | M_ZERO);
1666 if (tss == NULL) {
1667 INP_WUNLOCK(inp);
1668 return (ENOBUFS);
1669 }
1670 }
1671
1672 /*
1673 * Count number of sources in-mode at t0.
1674 * If buffer space exists and remains, copy out source entries.
1675 */
1676 nsrcs = msfr.msfr_nsrcs;
1677 ncsrcs = 0;
1678 ptss = tss;
1679 RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) {
1680 lims = (struct in_msource *)ims;
1681 if (lims->imsl_st[0] == MCAST_UNDEFINED ||
1682 lims->imsl_st[0] != imf->imf_st[0])
1683 continue;
1684 ++ncsrcs;
1685 if (tss != NULL && nsrcs > 0) {
1686 psin = (struct sockaddr_in *)ptss;
1687 psin->sin_family = AF_INET;
1688 psin->sin_len = sizeof(struct sockaddr_in);
1689 psin->sin_addr.s_addr = htonl(lims->ims_haddr);
1690 psin->sin_port = 0;
1691 ++ptss;
1692 --nsrcs;
1693 }
1694 }
1695
1696 INP_WUNLOCK(inp);
1697
1698 if (tss != NULL) {
1699 error = copyout(tss, msfr.msfr_srcs,
1700 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
1701 free(tss, M_TEMP);
1702 if (error)
1703 return (error);
1704 }
1705
1706 msfr.msfr_nsrcs = ncsrcs;
1707 error = sooptcopyout(sopt, &msfr, sizeof(struct __msfilterreq));
1708
1709 return (error);
1710 }
1711
1712 /*
1713 * Return the IP multicast options in response to user getsockopt().
1714 */
1715 int
1716 inp_getmoptions(struct inpcb *inp, struct sockopt *sopt)
1717 {
1718 struct ip_mreqn mreqn;
1719 struct ip_moptions *imo;
1720 struct ifnet *ifp;
1721 struct in_ifaddr *ia;
1722 int error, optval;
1723 u_char coptval;
1724
1725 INP_WLOCK(inp);
1726 imo = inp->inp_moptions;
1727 /*
1728 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
1729 * or is a divert socket, reject it.
1730 */
1731 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
1732 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
1733 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM)) {
1734 INP_WUNLOCK(inp);
1735 return (EOPNOTSUPP);
1736 }
1737
1738 error = 0;
1739 switch (sopt->sopt_name) {
1740 case IP_MULTICAST_VIF:
1741 if (imo != NULL)
1742 optval = imo->imo_multicast_vif;
1743 else
1744 optval = -1;
1745 INP_WUNLOCK(inp);
1746 error = sooptcopyout(sopt, &optval, sizeof(int));
1747 break;
1748
1749 case IP_MULTICAST_IF:
1750 memset(&mreqn, 0, sizeof(struct ip_mreqn));
1751 if (imo != NULL) {
1752 ifp = imo->imo_multicast_ifp;
1753 if (!in_nullhost(imo->imo_multicast_addr)) {
1754 mreqn.imr_address = imo->imo_multicast_addr;
1755 } else if (ifp != NULL) {
1756 mreqn.imr_ifindex = ifp->if_index;
1757 IFP_TO_IA(ifp, ia);
1758 if (ia != NULL) {
1759 mreqn.imr_address =
1760 IA_SIN(ia)->sin_addr;
1761 ifa_free(&ia->ia_ifa);
1762 }
1763 }
1764 }
1765 INP_WUNLOCK(inp);
1766 if (sopt->sopt_valsize == sizeof(struct ip_mreqn)) {
1767 error = sooptcopyout(sopt, &mreqn,
1768 sizeof(struct ip_mreqn));
1769 } else {
1770 error = sooptcopyout(sopt, &mreqn.imr_address,
1771 sizeof(struct in_addr));
1772 }
1773 break;
1774
1775 case IP_MULTICAST_TTL:
1776 if (imo == 0)
1777 optval = coptval = IP_DEFAULT_MULTICAST_TTL;
1778 else
1779 optval = coptval = imo->imo_multicast_ttl;
1780 INP_WUNLOCK(inp);
1781 if (sopt->sopt_valsize == sizeof(u_char))
1782 error = sooptcopyout(sopt, &coptval, sizeof(u_char));
1783 else
1784 error = sooptcopyout(sopt, &optval, sizeof(int));
1785 break;
1786
1787 case IP_MULTICAST_LOOP:
1788 if (imo == 0)
1789 optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
1790 else
1791 optval = coptval = imo->imo_multicast_loop;
1792 INP_WUNLOCK(inp);
1793 if (sopt->sopt_valsize == sizeof(u_char))
1794 error = sooptcopyout(sopt, &coptval, sizeof(u_char));
1795 else
1796 error = sooptcopyout(sopt, &optval, sizeof(int));
1797 break;
1798
1799 case IP_MSFILTER:
1800 if (imo == NULL) {
1801 error = EADDRNOTAVAIL;
1802 INP_WUNLOCK(inp);
1803 } else {
1804 error = inp_get_source_filters(inp, sopt);
1805 }
1806 break;
1807
1808 default:
1809 INP_WUNLOCK(inp);
1810 error = ENOPROTOOPT;
1811 break;
1812 }
1813
1814 INP_UNLOCK_ASSERT(inp);
1815
1816 return (error);
1817 }
1818
1819 /*
1820 * Look up the ifnet to use for a multicast group membership,
1821 * given the IPv4 address of an interface, and the IPv4 group address.
1822 *
1823 * This routine exists to support legacy multicast applications
1824 * which do not understand that multicast memberships are scoped to
1825 * specific physical links in the networking stack, or which need
1826 * to join link-scope groups before IPv4 addresses are configured.
1827 *
1828 * If inp is non-NULL, use this socket's current FIB number for any
1829 * required FIB lookup.
1830 * If ina is INADDR_ANY, look up the group address in the unicast FIB,
1831 * and use its ifp; usually, this points to the default next-hop.
1832 *
1833 * If the FIB lookup fails, attempt to use the first non-loopback
1834 * interface with multicast capability in the system as a
1835 * last resort. The legacy IPv4 ASM API requires that we do
1836 * this in order to allow groups to be joined when the routing
1837 * table has not yet been populated during boot.
1838 *
1839 * Returns NULL if no ifp could be found.
1840 *
1841 * FUTURE: Implement IPv4 source-address selection.
1842 */
1843 static struct ifnet *
1844 inp_lookup_mcast_ifp(const struct inpcb *inp,
1845 const struct sockaddr_in *gsin, const struct in_addr ina)
1846 {
1847 struct ifnet *ifp;
1848
1849 KASSERT(gsin->sin_family == AF_INET, ("%s: not AF_INET", __func__));
1850 KASSERT(IN_MULTICAST(ntohl(gsin->sin_addr.s_addr)),
1851 ("%s: not multicast", __func__));
1852
1853 ifp = NULL;
1854 if (!in_nullhost(ina)) {
1855 IN_IFADDR_RLOCK();
1856 INADDR_TO_IFP(ina, ifp);
1857 IN_IFADDR_RUNLOCK();
1858 } else {
1859 struct route ro;
1860
1861 ro.ro_rt = NULL;
1862 memcpy(&ro.ro_dst, gsin, sizeof(struct sockaddr_in));
1863 in_rtalloc_ign(&ro, 0, inp ? inp->inp_inc.inc_fibnum : 0);
1864 if (ro.ro_rt != NULL) {
1865 ifp = ro.ro_rt->rt_ifp;
1866 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
1867 RTFREE(ro.ro_rt);
1868 } else {
1869 struct in_ifaddr *ia;
1870 struct ifnet *mifp;
1871
1872 mifp = NULL;
1873 IN_IFADDR_RLOCK();
1874 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1875 mifp = ia->ia_ifp;
1876 if (!(mifp->if_flags & IFF_LOOPBACK) &&
1877 (mifp->if_flags & IFF_MULTICAST)) {
1878 ifp = mifp;
1879 break;
1880 }
1881 }
1882 IN_IFADDR_RUNLOCK();
1883 }
1884 }
1885
1886 return (ifp);
1887 }
1888
1889 /*
1890 * Join an IPv4 multicast group, possibly with a source.
1891 */
1892 static int
1893 inp_join_group(struct inpcb *inp, struct sockopt *sopt)
1894 {
1895 struct group_source_req gsr;
1896 sockunion_t *gsa, *ssa;
1897 struct ifnet *ifp;
1898 struct in_mfilter *imf;
1899 struct ip_moptions *imo;
1900 struct in_multi *inm;
1901 struct in_msource *lims;
1902 size_t idx;
1903 int error, is_new;
1904
1905 ifp = NULL;
1906 imf = NULL;
1907 lims = NULL;
1908 error = 0;
1909 is_new = 0;
1910
1911 memset(&gsr, 0, sizeof(struct group_source_req));
1912 gsa = (sockunion_t *)&gsr.gsr_group;
1913 gsa->ss.ss_family = AF_UNSPEC;
1914 ssa = (sockunion_t *)&gsr.gsr_source;
1915 ssa->ss.ss_family = AF_UNSPEC;
1916
1917 switch (sopt->sopt_name) {
1918 case IP_ADD_MEMBERSHIP:
1919 case IP_ADD_SOURCE_MEMBERSHIP: {
1920 struct ip_mreq_source mreqs;
1921
1922 if (sopt->sopt_name == IP_ADD_MEMBERSHIP) {
1923 error = sooptcopyin(sopt, &mreqs,
1924 sizeof(struct ip_mreq),
1925 sizeof(struct ip_mreq));
1926 /*
1927 * Do argument switcharoo from ip_mreq into
1928 * ip_mreq_source to avoid using two instances.
1929 */
1930 mreqs.imr_interface = mreqs.imr_sourceaddr;
1931 mreqs.imr_sourceaddr.s_addr = INADDR_ANY;
1932 } else if (sopt->sopt_name == IP_ADD_SOURCE_MEMBERSHIP) {
1933 error = sooptcopyin(sopt, &mreqs,
1934 sizeof(struct ip_mreq_source),
1935 sizeof(struct ip_mreq_source));
1936 }
1937 if (error)
1938 return (error);
1939
1940 gsa->sin.sin_family = AF_INET;
1941 gsa->sin.sin_len = sizeof(struct sockaddr_in);
1942 gsa->sin.sin_addr = mreqs.imr_multiaddr;
1943
1944 if (sopt->sopt_name == IP_ADD_SOURCE_MEMBERSHIP) {
1945 ssa->sin.sin_family = AF_INET;
1946 ssa->sin.sin_len = sizeof(struct sockaddr_in);
1947 ssa->sin.sin_addr = mreqs.imr_sourceaddr;
1948 }
1949
1950 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
1951 return (EINVAL);
1952
1953 ifp = inp_lookup_mcast_ifp(inp, &gsa->sin,
1954 mreqs.imr_interface);
1955 CTR3(KTR_IGMPV3, "%s: imr_interface = %s, ifp = %p",
1956 __func__, inet_ntoa(mreqs.imr_interface), ifp);
1957 break;
1958 }
1959
1960 case MCAST_JOIN_GROUP:
1961 case MCAST_JOIN_SOURCE_GROUP:
1962 if (sopt->sopt_name == MCAST_JOIN_GROUP) {
1963 error = sooptcopyin(sopt, &gsr,
1964 sizeof(struct group_req),
1965 sizeof(struct group_req));
1966 } else if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1967 error = sooptcopyin(sopt, &gsr,
1968 sizeof(struct group_source_req),
1969 sizeof(struct group_source_req));
1970 }
1971 if (error)
1972 return (error);
1973
1974 if (gsa->sin.sin_family != AF_INET ||
1975 gsa->sin.sin_len != sizeof(struct sockaddr_in))
1976 return (EINVAL);
1977
1978 /*
1979 * Overwrite the port field if present, as the sockaddr
1980 * being copied in may be matched with a binary comparison.
1981 */
1982 gsa->sin.sin_port = 0;
1983 if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1984 if (ssa->sin.sin_family != AF_INET ||
1985 ssa->sin.sin_len != sizeof(struct sockaddr_in))
1986 return (EINVAL);
1987 ssa->sin.sin_port = 0;
1988 }
1989
1990 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
1991 return (EINVAL);
1992
1993 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1994 return (EADDRNOTAVAIL);
1995 ifp = ifnet_byindex(gsr.gsr_interface);
1996 break;
1997
1998 default:
1999 CTR2(KTR_IGMPV3, "%s: unknown sopt_name %d",
2000 __func__, sopt->sopt_name);
2001 return (EOPNOTSUPP);
2002 break;
2003 }
2004
2005 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0)
2006 return (EADDRNOTAVAIL);
2007
2008 imo = inp_findmoptions(inp);
2009 idx = imo_match_group(imo, ifp, &gsa->sa);
2010 if (idx == -1) {
2011 is_new = 1;
2012 } else {
2013 inm = imo->imo_membership[idx];
2014 imf = &imo->imo_mfilters[idx];
2015 if (ssa->ss.ss_family != AF_UNSPEC) {
2016 /*
2017 * MCAST_JOIN_SOURCE_GROUP on an exclusive membership
2018 * is an error. On an existing inclusive membership,
2019 * it just adds the source to the filter list.
2020 */
2021 if (imf->imf_st[1] != MCAST_INCLUDE) {
2022 error = EINVAL;
2023 goto out_inp_locked;
2024 }
2025 /*
2026 * Throw out duplicates.
2027 *
2028 * XXX FIXME: This makes a naive assumption that
2029 * even if entries exist for *ssa in this imf,
2030 * they will be rejected as dupes, even if they
2031 * are not valid in the current mode (in-mode).
2032 *
2033 * in_msource is transactioned just as for anything
2034 * else in SSM -- but note naive use of inm_graft()
2035 * below for allocating new filter entries.
2036 *
2037 * This is only an issue if someone mixes the
2038 * full-state SSM API with the delta-based API,
2039 * which is discouraged in the relevant RFCs.
2040 */
2041 lims = imo_match_source(imo, idx, &ssa->sa);
2042 if (lims != NULL /*&&
2043 lims->imsl_st[1] == MCAST_INCLUDE*/) {
2044 error = EADDRNOTAVAIL;
2045 goto out_inp_locked;
2046 }
2047 } else {
2048 /*
2049 * MCAST_JOIN_GROUP on an existing exclusive
2050 * membership is an error; return EADDRINUSE
2051 * to preserve 4.4BSD API idempotence, and
2052 * avoid tedious detour to code below.
2053 * NOTE: This is bending RFC 3678 a bit.
2054 *
2055 * On an existing inclusive membership, this is also
2056 * an error; if you want to change filter mode,
2057 * you must use the userland API setsourcefilter().
2058 * XXX We don't reject this for imf in UNDEFINED
2059 * state at t1, because allocation of a filter
2060 * is atomic with allocation of a membership.
2061 */
2062 error = EINVAL;
2063 if (imf->imf_st[1] == MCAST_EXCLUDE)
2064 error = EADDRINUSE;
2065 goto out_inp_locked;
2066 }
2067 }
2068
2069 /*
2070 * Begin state merge transaction at socket layer.
2071 */
2072 INP_WLOCK_ASSERT(inp);
2073
2074 if (is_new) {
2075 if (imo->imo_num_memberships == imo->imo_max_memberships) {
2076 error = imo_grow(imo);
2077 if (error)
2078 goto out_inp_locked;
2079 }
2080 /*
2081 * Allocate the new slot upfront so we can deal with
2082 * grafting the new source filter in same code path
2083 * as for join-source on existing membership.
2084 */
2085 idx = imo->imo_num_memberships;
2086 imo->imo_membership[idx] = NULL;
2087 imo->imo_num_memberships++;
2088 KASSERT(imo->imo_mfilters != NULL,
2089 ("%s: imf_mfilters vector was not allocated", __func__));
2090 imf = &imo->imo_mfilters[idx];
2091 KASSERT(RB_EMPTY(&imf->imf_sources),
2092 ("%s: imf_sources not empty", __func__));
2093 }
2094
2095 /*
2096 * Graft new source into filter list for this inpcb's
2097 * membership of the group. The in_multi may not have
2098 * been allocated yet if this is a new membership, however,
2099 * the in_mfilter slot will be allocated and must be initialized.
2100 *
2101 * Note: Grafting of exclusive mode filters doesn't happen
2102 * in this path.
2103 * XXX: Should check for non-NULL lims (node exists but may
2104 * not be in-mode) for interop with full-state API.
2105 */
2106 if (ssa->ss.ss_family != AF_UNSPEC) {
2107 /* Membership starts in IN mode */
2108 if (is_new) {
2109 CTR1(KTR_IGMPV3, "%s: new join w/source", __func__);
2110 imf_init(imf, MCAST_UNDEFINED, MCAST_INCLUDE);
2111 } else {
2112 CTR2(KTR_IGMPV3, "%s: %s source", __func__, "allow");
2113 }
2114 lims = imf_graft(imf, MCAST_INCLUDE, &ssa->sin);
2115 if (lims == NULL) {
2116 CTR1(KTR_IGMPV3, "%s: merge imf state failed",
2117 __func__);
2118 error = ENOMEM;
2119 goto out_imo_free;
2120 }
2121 } else {
2122 /* No address specified; Membership starts in EX mode */
2123 if (is_new) {
2124 CTR1(KTR_IGMPV3, "%s: new join w/o source", __func__);
2125 imf_init(imf, MCAST_UNDEFINED, MCAST_EXCLUDE);
2126 }
2127 }
2128
2129 /*
2130 * Begin state merge transaction at IGMP layer.
2131 */
2132 IN_MULTI_LOCK();
2133
2134 if (is_new) {
2135 error = in_joingroup_locked(ifp, &gsa->sin.sin_addr, imf,
2136 &inm);
2137 if (error) {
2138 CTR1(KTR_IGMPV3, "%s: in_joingroup_locked failed",
2139 __func__);
2140 IN_MULTI_UNLOCK();
2141 goto out_imo_free;
2142 }
2143 imo->imo_membership[idx] = inm;
2144 } else {
2145 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
2146 error = inm_merge(inm, imf);
2147 if (error) {
2148 CTR1(KTR_IGMPV3, "%s: failed to merge inm state",
2149 __func__);
2150 goto out_in_multi_locked;
2151 }
2152 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
2153 error = igmp_change_state(inm);
2154 if (error) {
2155 CTR1(KTR_IGMPV3, "%s: failed igmp downcall",
2156 __func__);
2157 goto out_in_multi_locked;
2158 }
2159 }
2160
2161 out_in_multi_locked:
2162
2163 IN_MULTI_UNLOCK();
2164
2165 INP_WLOCK_ASSERT(inp);
2166 if (error) {
2167 imf_rollback(imf);
2168 if (is_new)
2169 imf_purge(imf);
2170 else
2171 imf_reap(imf);
2172 } else {
2173 imf_commit(imf);
2174 }
2175
2176 out_imo_free:
2177 if (error && is_new) {
2178 imo->imo_membership[idx] = NULL;
2179 --imo->imo_num_memberships;
2180 }
2181
2182 out_inp_locked:
2183 INP_WUNLOCK(inp);
2184 return (error);
2185 }
2186
2187 /*
2188 * Leave an IPv4 multicast group on an inpcb, possibly with a source.
2189 */
2190 static int
2191 inp_leave_group(struct inpcb *inp, struct sockopt *sopt)
2192 {
2193 struct group_source_req gsr;
2194 struct ip_mreq_source mreqs;
2195 sockunion_t *gsa, *ssa;
2196 struct ifnet *ifp;
2197 struct in_mfilter *imf;
2198 struct ip_moptions *imo;
2199 struct in_msource *ims;
2200 struct in_multi *inm;
2201 size_t idx;
2202 int error, is_final;
2203
2204 ifp = NULL;
2205 error = 0;
2206 is_final = 1;
2207
2208 memset(&gsr, 0, sizeof(struct group_source_req));
2209 gsa = (sockunion_t *)&gsr.gsr_group;
2210 gsa->ss.ss_family = AF_UNSPEC;
2211 ssa = (sockunion_t *)&gsr.gsr_source;
2212 ssa->ss.ss_family = AF_UNSPEC;
2213
2214 switch (sopt->sopt_name) {
2215 case IP_DROP_MEMBERSHIP:
2216 case IP_DROP_SOURCE_MEMBERSHIP:
2217 if (sopt->sopt_name == IP_DROP_MEMBERSHIP) {
2218 error = sooptcopyin(sopt, &mreqs,
2219 sizeof(struct ip_mreq),
2220 sizeof(struct ip_mreq));
2221 /*
2222 * Swap interface and sourceaddr arguments,
2223 * as ip_mreq and ip_mreq_source are laid
2224 * out differently.
2225 */
2226 mreqs.imr_interface = mreqs.imr_sourceaddr;
2227 mreqs.imr_sourceaddr.s_addr = INADDR_ANY;
2228 } else if (sopt->sopt_name == IP_DROP_SOURCE_MEMBERSHIP) {
2229 error = sooptcopyin(sopt, &mreqs,
2230 sizeof(struct ip_mreq_source),
2231 sizeof(struct ip_mreq_source));
2232 }
2233 if (error)
2234 return (error);
2235
2236 gsa->sin.sin_family = AF_INET;
2237 gsa->sin.sin_len = sizeof(struct sockaddr_in);
2238 gsa->sin.sin_addr = mreqs.imr_multiaddr;
2239
2240 if (sopt->sopt_name == IP_DROP_SOURCE_MEMBERSHIP) {
2241 ssa->sin.sin_family = AF_INET;
2242 ssa->sin.sin_len = sizeof(struct sockaddr_in);
2243 ssa->sin.sin_addr = mreqs.imr_sourceaddr;
2244 }
2245
2246 /*
2247 * Attempt to look up hinted ifp from interface address.
2248 * Fallthrough with null ifp iff lookup fails, to
2249 * preserve 4.4BSD mcast API idempotence.
2250 * XXX NOTE WELL: The RFC 3678 API is preferred because
2251 * using an IPv4 address as a key is racy.
2252 */
2253 if (!in_nullhost(mreqs.imr_interface)) {
2254 IN_IFADDR_RLOCK();
2255 INADDR_TO_IFP(mreqs.imr_interface, ifp);
2256 IN_IFADDR_RUNLOCK();
2257 }
2258 CTR3(KTR_IGMPV3, "%s: imr_interface = %s, ifp = %p",
2259 __func__, inet_ntoa(mreqs.imr_interface), ifp);
2260
2261 break;
2262
2263 case MCAST_LEAVE_GROUP:
2264 case MCAST_LEAVE_SOURCE_GROUP:
2265 if (sopt->sopt_name == MCAST_LEAVE_GROUP) {
2266 error = sooptcopyin(sopt, &gsr,
2267 sizeof(struct group_req),
2268 sizeof(struct group_req));
2269 } else if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2270 error = sooptcopyin(sopt, &gsr,
2271 sizeof(struct group_source_req),
2272 sizeof(struct group_source_req));
2273 }
2274 if (error)
2275 return (error);
2276
2277 if (gsa->sin.sin_family != AF_INET ||
2278 gsa->sin.sin_len != sizeof(struct sockaddr_in))
2279 return (EINVAL);
2280
2281 if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2282 if (ssa->sin.sin_family != AF_INET ||
2283 ssa->sin.sin_len != sizeof(struct sockaddr_in))
2284 return (EINVAL);
2285 }
2286
2287 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
2288 return (EADDRNOTAVAIL);
2289
2290 ifp = ifnet_byindex(gsr.gsr_interface);
2291
2292 if (ifp == NULL)
2293 return (EADDRNOTAVAIL);
2294 break;
2295
2296 default:
2297 CTR2(KTR_IGMPV3, "%s: unknown sopt_name %d",
2298 __func__, sopt->sopt_name);
2299 return (EOPNOTSUPP);
2300 break;
2301 }
2302
2303 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
2304 return (EINVAL);
2305
2306 /*
2307 * Find the membership in the membership array.
2308 */
2309 imo = inp_findmoptions(inp);
2310 idx = imo_match_group(imo, ifp, &gsa->sa);
2311 if (idx == -1) {
2312 error = EADDRNOTAVAIL;
2313 goto out_inp_locked;
2314 }
2315 inm = imo->imo_membership[idx];
2316 imf = &imo->imo_mfilters[idx];
2317
2318 if (ssa->ss.ss_family != AF_UNSPEC)
2319 is_final = 0;
2320
2321 /*
2322 * Begin state merge transaction at socket layer.
2323 */
2324 INP_WLOCK_ASSERT(inp);
2325
2326 /*
2327 * If we were instructed only to leave a given source, do so.
2328 * MCAST_LEAVE_SOURCE_GROUP is only valid for inclusive memberships.
2329 */
2330 if (is_final) {
2331 imf_leave(imf);
2332 } else {
2333 if (imf->imf_st[0] == MCAST_EXCLUDE) {
2334 error = EADDRNOTAVAIL;
2335 goto out_inp_locked;
2336 }
2337 ims = imo_match_source(imo, idx, &ssa->sa);
2338 if (ims == NULL) {
2339 CTR3(KTR_IGMPV3, "%s: source %s %spresent", __func__,
2340 inet_ntoa(ssa->sin.sin_addr), "not ");
2341 error = EADDRNOTAVAIL;
2342 goto out_inp_locked;
2343 }
2344 CTR2(KTR_IGMPV3, "%s: %s source", __func__, "block");
2345 error = imf_prune(imf, &ssa->sin);
2346 if (error) {
2347 CTR1(KTR_IGMPV3, "%s: merge imf state failed",
2348 __func__);
2349 goto out_inp_locked;
2350 }
2351 }
2352
2353 /*
2354 * Begin state merge transaction at IGMP layer.
2355 */
2356 IN_MULTI_LOCK();
2357
2358 if (is_final) {
2359 /*
2360 * Give up the multicast address record to which
2361 * the membership points.
2362 */
2363 (void)in_leavegroup_locked(inm, imf);
2364 } else {
2365 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
2366 error = inm_merge(inm, imf);
2367 if (error) {
2368 CTR1(KTR_IGMPV3, "%s: failed to merge inm state",
2369 __func__);
2370 goto out_in_multi_locked;
2371 }
2372
2373 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
2374 error = igmp_change_state(inm);
2375 if (error) {
2376 CTR1(KTR_IGMPV3, "%s: failed igmp downcall",
2377 __func__);
2378 }
2379 }
2380
2381 out_in_multi_locked:
2382
2383 IN_MULTI_UNLOCK();
2384
2385 if (error)
2386 imf_rollback(imf);
2387 else
2388 imf_commit(imf);
2389
2390 imf_reap(imf);
2391
2392 if (is_final) {
2393 /* Remove the gap in the membership and filter array. */
2394 for (++idx; idx < imo->imo_num_memberships; ++idx) {
2395 imo->imo_membership[idx-1] = imo->imo_membership[idx];
2396 imo->imo_mfilters[idx-1] = imo->imo_mfilters[idx];
2397 }
2398 imo->imo_num_memberships--;
2399 }
2400
2401 out_inp_locked:
2402 INP_WUNLOCK(inp);
2403 return (error);
2404 }
2405
2406 /*
2407 * Select the interface for transmitting IPv4 multicast datagrams.
2408 *
2409 * Either an instance of struct in_addr or an instance of struct ip_mreqn
2410 * may be passed to this socket option. An address of INADDR_ANY or an
2411 * interface index of 0 is used to remove a previous selection.
2412 * When no interface is selected, one is chosen for every send.
2413 */
2414 static int
2415 inp_set_multicast_if(struct inpcb *inp, struct sockopt *sopt)
2416 {
2417 struct in_addr addr;
2418 struct ip_mreqn mreqn;
2419 struct ifnet *ifp;
2420 struct ip_moptions *imo;
2421 int error;
2422
2423 if (sopt->sopt_valsize == sizeof(struct ip_mreqn)) {
2424 /*
2425 * An interface index was specified using the
2426 * Linux-derived ip_mreqn structure.
2427 */
2428 error = sooptcopyin(sopt, &mreqn, sizeof(struct ip_mreqn),
2429 sizeof(struct ip_mreqn));
2430 if (error)
2431 return (error);
2432
2433 if (mreqn.imr_ifindex < 0 || V_if_index < mreqn.imr_ifindex)
2434 return (EINVAL);
2435
2436 if (mreqn.imr_ifindex == 0) {
2437 ifp = NULL;
2438 } else {
2439 ifp = ifnet_byindex(mreqn.imr_ifindex);
2440 if (ifp == NULL)
2441 return (EADDRNOTAVAIL);
2442 }
2443 } else {
2444 /*
2445 * An interface was specified by IPv4 address.
2446 * This is the traditional BSD usage.
2447 */
2448 error = sooptcopyin(sopt, &addr, sizeof(struct in_addr),
2449 sizeof(struct in_addr));
2450 if (error)
2451 return (error);
2452 if (in_nullhost(addr)) {
2453 ifp = NULL;
2454 } else {
2455 IN_IFADDR_RLOCK();
2456 INADDR_TO_IFP(addr, ifp);
2457 IN_IFADDR_RUNLOCK();
2458 if (ifp == NULL)
2459 return (EADDRNOTAVAIL);
2460 }
2461 CTR3(KTR_IGMPV3, "%s: ifp = %p, addr = %s", __func__, ifp,
2462 inet_ntoa(addr));
2463 }
2464
2465 /* Reject interfaces which do not support multicast. */
2466 if (ifp != NULL && (ifp->if_flags & IFF_MULTICAST) == 0)
2467 return (EOPNOTSUPP);
2468
2469 imo = inp_findmoptions(inp);
2470 imo->imo_multicast_ifp = ifp;
2471 imo->imo_multicast_addr.s_addr = INADDR_ANY;
2472 INP_WUNLOCK(inp);
2473
2474 return (0);
2475 }
2476
2477 /*
2478 * Atomically set source filters on a socket for an IPv4 multicast group.
2479 *
2480 * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
2481 */
2482 static int
2483 inp_set_source_filters(struct inpcb *inp, struct sockopt *sopt)
2484 {
2485 struct __msfilterreq msfr;
2486 sockunion_t *gsa;
2487 struct ifnet *ifp;
2488 struct in_mfilter *imf;
2489 struct ip_moptions *imo;
2490 struct in_multi *inm;
2491 size_t idx;
2492 int error;
2493
2494 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
2495 sizeof(struct __msfilterreq));
2496 if (error)
2497 return (error);
2498
2499 if (msfr.msfr_nsrcs > in_mcast_maxsocksrc)
2500 return (ENOBUFS);
2501
2502 if ((msfr.msfr_fmode != MCAST_EXCLUDE &&
2503 msfr.msfr_fmode != MCAST_INCLUDE))
2504 return (EINVAL);
2505
2506 if (msfr.msfr_group.ss_family != AF_INET ||
2507 msfr.msfr_group.ss_len != sizeof(struct sockaddr_in))
2508 return (EINVAL);
2509
2510 gsa = (sockunion_t *)&msfr.msfr_group;
2511 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
2512 return (EINVAL);
2513
2514 gsa->sin.sin_port = 0; /* ignore port */
2515
2516 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
2517 return (EADDRNOTAVAIL);
2518
2519 ifp = ifnet_byindex(msfr.msfr_ifindex);
2520 if (ifp == NULL)
2521 return (EADDRNOTAVAIL);
2522
2523 /*
2524 * Take the INP write lock.
2525 * Check if this socket is a member of this group.
2526 */
2527 imo = inp_findmoptions(inp);
2528 idx = imo_match_group(imo, ifp, &gsa->sa);
2529 if (idx == -1 || imo->imo_mfilters == NULL) {
2530 error = EADDRNOTAVAIL;
2531 goto out_inp_locked;
2532 }
2533 inm = imo->imo_membership[idx];
2534 imf = &imo->imo_mfilters[idx];
2535
2536 /*
2537 * Begin state merge transaction at socket layer.
2538 */
2539 INP_WLOCK_ASSERT(inp);
2540
2541 imf->imf_st[1] = msfr.msfr_fmode;
2542
2543 /*
2544 * Apply any new source filters, if present.
2545 * Make a copy of the user-space source vector so
2546 * that we may copy them with a single copyin. This
2547 * allows us to deal with page faults up-front.
2548 */
2549 if (msfr.msfr_nsrcs > 0) {
2550 struct in_msource *lims;
2551 struct sockaddr_in *psin;
2552 struct sockaddr_storage *kss, *pkss;
2553 int i;
2554
2555 INP_WUNLOCK(inp);
2556
2557 CTR2(KTR_IGMPV3, "%s: loading %lu source list entries",
2558 __func__, (unsigned long)msfr.msfr_nsrcs);
2559 kss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
2560 M_TEMP, M_WAITOK);
2561 error = copyin(msfr.msfr_srcs, kss,
2562 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
2563 if (error) {
2564 free(kss, M_TEMP);
2565 return (error);
2566 }
2567
2568 INP_WLOCK(inp);
2569
2570 /*
2571 * Mark all source filters as UNDEFINED at t1.
2572 * Restore new group filter mode, as imf_leave()
2573 * will set it to INCLUDE.
2574 */
2575 imf_leave(imf);
2576 imf->imf_st[1] = msfr.msfr_fmode;
2577
2578 /*
2579 * Update socket layer filters at t1, lazy-allocating
2580 * new entries. This saves a bunch of memory at the
2581 * cost of one RB_FIND() per source entry; duplicate
2582 * entries in the msfr_nsrcs vector are ignored.
2583 * If we encounter an error, rollback transaction.
2584 *
2585 * XXX This too could be replaced with a set-symmetric
2586 * difference like loop to avoid walking from root
2587 * every time, as the key space is common.
2588 */
2589 for (i = 0, pkss = kss; i < msfr.msfr_nsrcs; i++, pkss++) {
2590 psin = (struct sockaddr_in *)pkss;
2591 if (psin->sin_family != AF_INET) {
2592 error = EAFNOSUPPORT;
2593 break;
2594 }
2595 if (psin->sin_len != sizeof(struct sockaddr_in)) {
2596 error = EINVAL;
2597 break;
2598 }
2599 error = imf_get_source(imf, psin, &lims);
2600 if (error)
2601 break;
2602 lims->imsl_st[1] = imf->imf_st[1];
2603 }
2604 free(kss, M_TEMP);
2605 }
2606
2607 if (error)
2608 goto out_imf_rollback;
2609
2610 INP_WLOCK_ASSERT(inp);
2611 IN_MULTI_LOCK();
2612
2613 /*
2614 * Begin state merge transaction at IGMP layer.
2615 */
2616 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
2617 error = inm_merge(inm, imf);
2618 if (error) {
2619 CTR1(KTR_IGMPV3, "%s: failed to merge inm state", __func__);
2620 goto out_in_multi_locked;
2621 }
2622
2623 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
2624 error = igmp_change_state(inm);
2625 if (error)
2626 CTR1(KTR_IGMPV3, "%s: failed igmp downcall", __func__);
2627
2628 out_in_multi_locked:
2629
2630 IN_MULTI_UNLOCK();
2631
2632 out_imf_rollback:
2633 if (error)
2634 imf_rollback(imf);
2635 else
2636 imf_commit(imf);
2637
2638 imf_reap(imf);
2639
2640 out_inp_locked:
2641 INP_WUNLOCK(inp);
2642 return (error);
2643 }
2644
2645 /*
2646 * Set the IP multicast options in response to user setsockopt().
2647 *
2648 * Many of the socket options handled in this function duplicate the
2649 * functionality of socket options in the regular unicast API. However,
2650 * it is not possible to merge the duplicate code, because the idempotence
2651 * of the IPv4 multicast part of the BSD Sockets API must be preserved;
2652 * the effects of these options must be treated as separate and distinct.
2653 *
2654 * SMPng: XXX: Unlocked read of inp_socket believed OK.
2655 * FUTURE: The IP_MULTICAST_VIF option may be eliminated if MROUTING
2656 * is refactored to no longer use vifs.
2657 */
2658 int
2659 inp_setmoptions(struct inpcb *inp, struct sockopt *sopt)
2660 {
2661 struct ip_moptions *imo;
2662 int error;
2663
2664 error = 0;
2665
2666 /*
2667 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
2668 * or is a divert socket, reject it.
2669 */
2670 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
2671 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
2672 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM))
2673 return (EOPNOTSUPP);
2674
2675 switch (sopt->sopt_name) {
2676 case IP_MULTICAST_VIF: {
2677 int vifi;
2678 /*
2679 * Select a multicast VIF for transmission.
2680 * Only useful if multicast forwarding is active.
2681 */
2682 if (legal_vif_num == NULL) {
2683 error = EOPNOTSUPP;
2684 break;
2685 }
2686 error = sooptcopyin(sopt, &vifi, sizeof(int), sizeof(int));
2687 if (error)
2688 break;
2689 if (!legal_vif_num(vifi) && (vifi != -1)) {
2690 error = EINVAL;
2691 break;
2692 }
2693 imo = inp_findmoptions(inp);
2694 imo->imo_multicast_vif = vifi;
2695 INP_WUNLOCK(inp);
2696 break;
2697 }
2698
2699 case IP_MULTICAST_IF:
2700 error = inp_set_multicast_if(inp, sopt);
2701 break;
2702
2703 case IP_MULTICAST_TTL: {
2704 u_char ttl;
2705
2706 /*
2707 * Set the IP time-to-live for outgoing multicast packets.
2708 * The original multicast API required a char argument,
2709 * which is inconsistent with the rest of the socket API.
2710 * We allow either a char or an int.
2711 */
2712 if (sopt->sopt_valsize == sizeof(u_char)) {
2713 error = sooptcopyin(sopt, &ttl, sizeof(u_char),
2714 sizeof(u_char));
2715 if (error)
2716 break;
2717 } else {
2718 u_int ittl;
2719
2720 error = sooptcopyin(sopt, &ittl, sizeof(u_int),
2721 sizeof(u_int));
2722 if (error)
2723 break;
2724 if (ittl > 255) {
2725 error = EINVAL;
2726 break;
2727 }
2728 ttl = (u_char)ittl;
2729 }
2730 imo = inp_findmoptions(inp);
2731 imo->imo_multicast_ttl = ttl;
2732 INP_WUNLOCK(inp);
2733 break;
2734 }
2735
2736 case IP_MULTICAST_LOOP: {
2737 u_char loop;
2738
2739 /*
2740 * Set the loopback flag for outgoing multicast packets.
2741 * Must be zero or one. The original multicast API required a
2742 * char argument, which is inconsistent with the rest
2743 * of the socket API. We allow either a char or an int.
2744 */
2745 if (sopt->sopt_valsize == sizeof(u_char)) {
2746 error = sooptcopyin(sopt, &loop, sizeof(u_char),
2747 sizeof(u_char));
2748 if (error)
2749 break;
2750 } else {
2751 u_int iloop;
2752
2753 error = sooptcopyin(sopt, &iloop, sizeof(u_int),
2754 sizeof(u_int));
2755 if (error)
2756 break;
2757 loop = (u_char)iloop;
2758 }
2759 imo = inp_findmoptions(inp);
2760 imo->imo_multicast_loop = !!loop;
2761 INP_WUNLOCK(inp);
2762 break;
2763 }
2764
2765 case IP_ADD_MEMBERSHIP:
2766 case IP_ADD_SOURCE_MEMBERSHIP:
2767 case MCAST_JOIN_GROUP:
2768 case MCAST_JOIN_SOURCE_GROUP:
2769 error = inp_join_group(inp, sopt);
2770 break;
2771
2772 case IP_DROP_MEMBERSHIP:
2773 case IP_DROP_SOURCE_MEMBERSHIP:
2774 case MCAST_LEAVE_GROUP:
2775 case MCAST_LEAVE_SOURCE_GROUP:
2776 error = inp_leave_group(inp, sopt);
2777 break;
2778
2779 case IP_BLOCK_SOURCE:
2780 case IP_UNBLOCK_SOURCE:
2781 case MCAST_BLOCK_SOURCE:
2782 case MCAST_UNBLOCK_SOURCE:
2783 error = inp_block_unblock_source(inp, sopt);
2784 break;
2785
2786 case IP_MSFILTER:
2787 error = inp_set_source_filters(inp, sopt);
2788 break;
2789
2790 default:
2791 error = EOPNOTSUPP;
2792 break;
2793 }
2794
2795 INP_UNLOCK_ASSERT(inp);
2796
2797 return (error);
2798 }
2799
2800 /*
2801 * Expose IGMP's multicast filter mode and source list(s) to userland,
2802 * keyed by (ifindex, group).
2803 * The filter mode is written out as a uint32_t, followed by
2804 * 0..n of struct in_addr.
2805 * For use by ifmcstat(8).
2806 * SMPng: NOTE: unlocked read of ifindex space.
2807 */
2808 static int
2809 sysctl_ip_mcast_filters(SYSCTL_HANDLER_ARGS)
2810 {
2811 struct in_addr src, group;
2812 struct ifnet *ifp;
2813 struct ifmultiaddr *ifma;
2814 struct in_multi *inm;
2815 struct ip_msource *ims;
2816 int *name;
2817 int retval;
2818 u_int namelen;
2819 uint32_t fmode, ifindex;
2820
2821 name = (int *)arg1;
2822 namelen = arg2;
2823
2824 if (req->newptr != NULL)
2825 return (EPERM);
2826
2827 if (namelen != 2)
2828 return (EINVAL);
2829
2830 ifindex = name[0];
2831 if (ifindex <= 0 || ifindex > V_if_index) {
2832 CTR2(KTR_IGMPV3, "%s: ifindex %u out of range",
2833 __func__, ifindex);
2834 return (ENOENT);
2835 }
2836
2837 group.s_addr = name[1];
2838 if (!IN_MULTICAST(ntohl(group.s_addr))) {
2839 CTR2(KTR_IGMPV3, "%s: group %s is not multicast",
2840 __func__, inet_ntoa(group));
2841 return (EINVAL);
2842 }
2843
2844 ifp = ifnet_byindex(ifindex);
2845 if (ifp == NULL) {
2846 CTR2(KTR_IGMPV3, "%s: no ifp for ifindex %u",
2847 __func__, ifindex);
2848 return (ENOENT);
2849 }
2850
2851 retval = sysctl_wire_old_buffer(req,
2852 sizeof(uint32_t) + (in_mcast_maxgrpsrc * sizeof(struct in_addr)));
2853 if (retval)
2854 return (retval);
2855
2856 IN_MULTI_LOCK();
2857
2858 IF_ADDR_RLOCK(ifp);
2859 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2860 if (ifma->ifma_addr->sa_family != AF_INET ||
2861 ifma->ifma_protospec == NULL)
2862 continue;
2863 inm = (struct in_multi *)ifma->ifma_protospec;
2864 if (!in_hosteq(inm->inm_addr, group))
2865 continue;
2866 fmode = inm->inm_st[1].iss_fmode;
2867 retval = SYSCTL_OUT(req, &fmode, sizeof(uint32_t));
2868 if (retval != 0)
2869 break;
2870 RB_FOREACH(ims, ip_msource_tree, &inm->inm_srcs) {
2871 #ifdef KTR
2872 struct in_addr ina;
2873 ina.s_addr = htonl(ims->ims_haddr);
2874 CTR2(KTR_IGMPV3, "%s: visit node %s", __func__,
2875 inet_ntoa(ina));
2876 #endif
2877 /*
2878 * Only copy-out sources which are in-mode.
2879 */
2880 if (fmode != ims_get_mode(inm, ims, 1)) {
2881 CTR1(KTR_IGMPV3, "%s: skip non-in-mode",
2882 __func__);
2883 continue;
2884 }
2885 src.s_addr = htonl(ims->ims_haddr);
2886 retval = SYSCTL_OUT(req, &src, sizeof(struct in_addr));
2887 if (retval != 0)
2888 break;
2889 }
2890 }
2891 IF_ADDR_RUNLOCK(ifp);
2892
2893 IN_MULTI_UNLOCK();
2894
2895 return (retval);
2896 }
2897
2898 #ifdef KTR
2899
2900 static const char *inm_modestrs[] = { "un", "in", "ex" };
2901
2902 static const char *
2903 inm_mode_str(const int mode)
2904 {
2905
2906 if (mode >= MCAST_UNDEFINED && mode <= MCAST_EXCLUDE)
2907 return (inm_modestrs[mode]);
2908 return ("??");
2909 }
2910
2911 static const char *inm_statestrs[] = {
2912 "not-member",
2913 "silent",
2914 "idle",
2915 "lazy",
2916 "sleeping",
2917 "awakening",
2918 "query-pending",
2919 "sg-query-pending",
2920 "leaving"
2921 };
2922
2923 static const char *
2924 inm_state_str(const int state)
2925 {
2926
2927 if (state >= IGMP_NOT_MEMBER && state <= IGMP_LEAVING_MEMBER)
2928 return (inm_statestrs[state]);
2929 return ("??");
2930 }
2931
2932 /*
2933 * Dump an in_multi structure to the console.
2934 */
2935 void
2936 inm_print(const struct in_multi *inm)
2937 {
2938 int t;
2939
2940 if ((ktr_mask & KTR_IGMPV3) == 0)
2941 return;
2942
2943 printf("%s: --- begin inm %p ---\n", __func__, inm);
2944 printf("addr %s ifp %p(%s) ifma %p\n",
2945 inet_ntoa(inm->inm_addr),
2946 inm->inm_ifp,
2947 inm->inm_ifp->if_xname,
2948 inm->inm_ifma);
2949 printf("timer %u state %s refcount %u scq.len %u\n",
2950 inm->inm_timer,
2951 inm_state_str(inm->inm_state),
2952 inm->inm_refcount,
2953 inm->inm_scq.ifq_len);
2954 printf("igi %p nsrc %lu sctimer %u scrv %u\n",
2955 inm->inm_igi,
2956 inm->inm_nsrc,
2957 inm->inm_sctimer,
2958 inm->inm_scrv);
2959 for (t = 0; t < 2; t++) {
2960 printf("t%d: fmode %s asm %u ex %u in %u rec %u\n", t,
2961 inm_mode_str(inm->inm_st[t].iss_fmode),
2962 inm->inm_st[t].iss_asm,
2963 inm->inm_st[t].iss_ex,
2964 inm->inm_st[t].iss_in,
2965 inm->inm_st[t].iss_rec);
2966 }
2967 printf("%s: --- end inm %p ---\n", __func__, inm);
2968 }
2969
2970 #else /* !KTR */
2971
2972 void
2973 inm_print(const struct in_multi *inm)
2974 {
2975
2976 }
2977
2978 #endif /* KTR */
2979
2980 RB_GENERATE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
Cache object: 6e9a1a033d736598c89bbc1bd55a82d0
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