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/tree.h>
50
51 #include <net/if.h>
52 #include <net/if_dl.h>
53 #include <net/route.h>
54 #include <net/vnet.h>
55
56 #include <netinet/in.h>
57 #include <netinet/in_systm.h>
58 #include <netinet/in_pcb.h>
59 #include <netinet/in_var.h>
60 #include <netinet/ip_var.h>
61 #include <netinet/igmp_var.h>
62
63 #ifndef KTR_IGMPV3
64 #define KTR_IGMPV3 KTR_INET
65 #endif
66
67 #ifndef __SOCKUNION_DECLARED
68 union sockunion {
69 struct sockaddr_storage ss;
70 struct sockaddr sa;
71 struct sockaddr_dl sdl;
72 struct sockaddr_in sin;
73 };
74 typedef union sockunion sockunion_t;
75 #define __SOCKUNION_DECLARED
76 #endif /* __SOCKUNION_DECLARED */
77
78 static MALLOC_DEFINE(M_INMFILTER, "in_mfilter",
79 "IPv4 multicast PCB-layer source filter");
80 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "IPv4 multicast group");
81 static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "IPv4 multicast options");
82 static MALLOC_DEFINE(M_IPMSOURCE, "ip_msource",
83 "IPv4 multicast IGMP-layer source filter");
84
85 /*
86 * Locking:
87 * - Lock order is: Giant, INP_WLOCK, IN_MULTI_LOCK, IGMP_LOCK, IF_ADDR_LOCK.
88 * - The IF_ADDR_LOCK is implicitly taken by inm_lookup() earlier, however
89 * it can be taken by code in net/if.c also.
90 * - ip_moptions and in_mfilter are covered by the INP_WLOCK.
91 *
92 * struct in_multi is covered by IN_MULTI_LOCK. There isn't strictly
93 * any need for in_multi itself to be virtualized -- it is bound to an ifp
94 * anyway no matter what happens.
95 */
96 struct mtx in_multi_mtx;
97 MTX_SYSINIT(in_multi_mtx, &in_multi_mtx, "in_multi_mtx", MTX_DEF);
98
99 /*
100 * Functions with non-static linkage defined in this file should be
101 * declared in in_var.h:
102 * imo_multi_filter()
103 * in_addmulti()
104 * in_delmulti()
105 * in_joingroup()
106 * in_joingroup_locked()
107 * in_leavegroup()
108 * in_leavegroup_locked()
109 * and ip_var.h:
110 * inp_freemoptions()
111 * inp_getmoptions()
112 * inp_setmoptions()
113 *
114 * XXX: Both carp and pf need to use the legacy (*,G) KPIs in_addmulti()
115 * and in_delmulti().
116 */
117 static void imf_commit(struct in_mfilter *);
118 static int imf_get_source(struct in_mfilter *imf,
119 const struct sockaddr_in *psin,
120 struct in_msource **);
121 static struct in_msource *
122 imf_graft(struct in_mfilter *, const uint8_t,
123 const struct sockaddr_in *);
124 static void imf_leave(struct in_mfilter *);
125 static int imf_prune(struct in_mfilter *, const struct sockaddr_in *);
126 static void imf_purge(struct in_mfilter *);
127 static void imf_rollback(struct in_mfilter *);
128 static void imf_reap(struct in_mfilter *);
129 static int imo_grow(struct ip_moptions *);
130 static size_t imo_match_group(const struct ip_moptions *,
131 const struct ifnet *, const struct sockaddr *);
132 static struct in_msource *
133 imo_match_source(const struct ip_moptions *, const size_t,
134 const struct sockaddr *);
135 static void ims_merge(struct ip_msource *ims,
136 const struct in_msource *lims, const int rollback);
137 static int in_getmulti(struct ifnet *, const struct in_addr *,
138 struct in_multi **);
139 static int inm_get_source(struct in_multi *inm, const in_addr_t haddr,
140 const int noalloc, struct ip_msource **pims);
141 #ifdef KTR
142 static int inm_is_ifp_detached(const struct in_multi *);
143 #endif
144 static int inm_merge(struct in_multi *, /*const*/ struct in_mfilter *);
145 static void inm_purge(struct in_multi *);
146 static void inm_reap(struct in_multi *);
147 static struct ip_moptions *
148 inp_findmoptions(struct inpcb *);
149 static int inp_get_source_filters(struct inpcb *, struct sockopt *);
150 static int inp_join_group(struct inpcb *, struct sockopt *);
151 static int inp_leave_group(struct inpcb *, struct sockopt *);
152 static struct ifnet *
153 inp_lookup_mcast_ifp(const struct inpcb *,
154 const struct sockaddr_in *, const struct in_addr);
155 static int inp_block_unblock_source(struct inpcb *, struct sockopt *);
156 static int inp_set_multicast_if(struct inpcb *, struct sockopt *);
157 static int inp_set_source_filters(struct inpcb *, struct sockopt *);
158 static int sysctl_ip_mcast_filters(SYSCTL_HANDLER_ARGS);
159
160 static SYSCTL_NODE(_net_inet_ip, OID_AUTO, mcast, CTLFLAG_RW, 0,
161 "IPv4 multicast");
162
163 static u_long in_mcast_maxgrpsrc = IP_MAX_GROUP_SRC_FILTER;
164 SYSCTL_ULONG(_net_inet_ip_mcast, OID_AUTO, maxgrpsrc,
165 CTLFLAG_RW | CTLFLAG_TUN, &in_mcast_maxgrpsrc, 0,
166 "Max source filters per group");
167 TUNABLE_ULONG("net.inet.ip.mcast.maxgrpsrc", &in_mcast_maxgrpsrc);
168
169 static u_long in_mcast_maxsocksrc = IP_MAX_SOCK_SRC_FILTER;
170 SYSCTL_ULONG(_net_inet_ip_mcast, OID_AUTO, maxsocksrc,
171 CTLFLAG_RW | CTLFLAG_TUN, &in_mcast_maxsocksrc, 0,
172 "Max source filters per socket");
173 TUNABLE_ULONG("net.inet.ip.mcast.maxsocksrc", &in_mcast_maxsocksrc);
174
175 int in_mcast_loop = IP_DEFAULT_MULTICAST_LOOP;
176 SYSCTL_INT(_net_inet_ip_mcast, OID_AUTO, loop, CTLFLAG_RW | CTLFLAG_TUN,
177 &in_mcast_loop, 0, "Loopback multicast datagrams by default");
178 TUNABLE_INT("net.inet.ip.mcast.loop", &in_mcast_loop);
179
180 static SYSCTL_NODE(_net_inet_ip_mcast, OID_AUTO, filters,
181 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ip_mcast_filters,
182 "Per-interface stack-wide source filters");
183
184 #ifdef KTR
185 /*
186 * Inline function which wraps assertions for a valid ifp.
187 * The ifnet layer will set the ifma's ifp pointer to NULL if the ifp
188 * is detached.
189 */
190 static int __inline
191 inm_is_ifp_detached(const struct in_multi *inm)
192 {
193 struct ifnet *ifp;
194
195 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__));
196 ifp = inm->inm_ifma->ifma_ifp;
197 if (ifp != NULL) {
198 /*
199 * Sanity check that netinet's notion of ifp is the
200 * same as net's.
201 */
202 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__));
203 }
204
205 return (ifp == NULL);
206 }
207 #endif
208
209 /*
210 * Initialize an in_mfilter structure to a known state at t0, t1
211 * with an empty source filter list.
212 */
213 static __inline void
214 imf_init(struct in_mfilter *imf, const int st0, const int st1)
215 {
216 memset(imf, 0, sizeof(struct in_mfilter));
217 RB_INIT(&imf->imf_sources);
218 imf->imf_st[0] = st0;
219 imf->imf_st[1] = st1;
220 }
221
222 /*
223 * Resize the ip_moptions vector to the next power-of-two minus 1.
224 * May be called with locks held; do not sleep.
225 */
226 static int
227 imo_grow(struct ip_moptions *imo)
228 {
229 struct in_multi **nmships;
230 struct in_multi **omships;
231 struct in_mfilter *nmfilters;
232 struct in_mfilter *omfilters;
233 size_t idx;
234 size_t newmax;
235 size_t oldmax;
236
237 nmships = NULL;
238 nmfilters = NULL;
239 omships = imo->imo_membership;
240 omfilters = imo->imo_mfilters;
241 oldmax = imo->imo_max_memberships;
242 newmax = ((oldmax + 1) * 2) - 1;
243
244 if (newmax <= IP_MAX_MEMBERSHIPS) {
245 nmships = (struct in_multi **)realloc(omships,
246 sizeof(struct in_multi *) * newmax, M_IPMOPTS, M_NOWAIT);
247 nmfilters = (struct in_mfilter *)realloc(omfilters,
248 sizeof(struct in_mfilter) * newmax, M_INMFILTER, M_NOWAIT);
249 if (nmships != NULL && nmfilters != NULL) {
250 /* Initialize newly allocated source filter heads. */
251 for (idx = oldmax; idx < newmax; idx++) {
252 imf_init(&nmfilters[idx], MCAST_UNDEFINED,
253 MCAST_EXCLUDE);
254 }
255 imo->imo_max_memberships = newmax;
256 imo->imo_membership = nmships;
257 imo->imo_mfilters = nmfilters;
258 }
259 }
260
261 if (nmships == NULL || nmfilters == NULL) {
262 if (nmships != NULL)
263 free(nmships, M_IPMOPTS);
264 if (nmfilters != NULL)
265 free(nmfilters, M_INMFILTER);
266 return (ETOOMANYREFS);
267 }
268
269 return (0);
270 }
271
272 /*
273 * Find an IPv4 multicast group entry for this ip_moptions instance
274 * which matches the specified group, and optionally an interface.
275 * Return its index into the array, or -1 if not found.
276 */
277 static size_t
278 imo_match_group(const struct ip_moptions *imo, const struct ifnet *ifp,
279 const struct sockaddr *group)
280 {
281 const struct sockaddr_in *gsin;
282 struct in_multi **pinm;
283 int idx;
284 int nmships;
285
286 gsin = (const struct sockaddr_in *)group;
287
288 /* The imo_membership array may be lazy allocated. */
289 if (imo->imo_membership == NULL || imo->imo_num_memberships == 0)
290 return (-1);
291
292 nmships = imo->imo_num_memberships;
293 pinm = &imo->imo_membership[0];
294 for (idx = 0; idx < nmships; idx++, pinm++) {
295 if (*pinm == NULL)
296 continue;
297 if ((ifp == NULL || ((*pinm)->inm_ifp == ifp)) &&
298 in_hosteq((*pinm)->inm_addr, gsin->sin_addr)) {
299 break;
300 }
301 }
302 if (idx >= nmships)
303 idx = -1;
304
305 return (idx);
306 }
307
308 /*
309 * Find an IPv4 multicast source entry for this imo which matches
310 * the given group index for this socket, and source address.
311 *
312 * NOTE: This does not check if the entry is in-mode, merely if
313 * it exists, which may not be the desired behaviour.
314 */
315 static struct in_msource *
316 imo_match_source(const struct ip_moptions *imo, const size_t gidx,
317 const struct sockaddr *src)
318 {
319 struct ip_msource find;
320 struct in_mfilter *imf;
321 struct ip_msource *ims;
322 const sockunion_t *psa;
323
324 KASSERT(src->sa_family == AF_INET, ("%s: !AF_INET", __func__));
325 KASSERT(gidx != -1 && gidx < imo->imo_num_memberships,
326 ("%s: invalid index %d\n", __func__, (int)gidx));
327
328 /* The imo_mfilters array may be lazy allocated. */
329 if (imo->imo_mfilters == NULL)
330 return (NULL);
331 imf = &imo->imo_mfilters[gidx];
332
333 /* Source trees are keyed in host byte order. */
334 psa = (const sockunion_t *)src;
335 find.ims_haddr = ntohl(psa->sin.sin_addr.s_addr);
336 ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find);
337
338 return ((struct in_msource *)ims);
339 }
340
341 /*
342 * Perform filtering for multicast datagrams on a socket by group and source.
343 *
344 * Returns 0 if a datagram should be allowed through, or various error codes
345 * if the socket was not a member of the group, or the source was muted, etc.
346 */
347 int
348 imo_multi_filter(const struct ip_moptions *imo, const struct ifnet *ifp,
349 const struct sockaddr *group, const struct sockaddr *src)
350 {
351 size_t gidx;
352 struct in_msource *ims;
353 int mode;
354
355 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
356
357 gidx = imo_match_group(imo, ifp, group);
358 if (gidx == -1)
359 return (MCAST_NOTGMEMBER);
360
361 /*
362 * Check if the source was included in an (S,G) join.
363 * Allow reception on exclusive memberships by default,
364 * reject reception on inclusive memberships by default.
365 * Exclude source only if an in-mode exclude filter exists.
366 * Include source only if an in-mode include filter exists.
367 * NOTE: We are comparing group state here at IGMP t1 (now)
368 * with socket-layer t0 (since last downcall).
369 */
370 mode = imo->imo_mfilters[gidx].imf_st[1];
371 ims = imo_match_source(imo, gidx, src);
372
373 if ((ims == NULL && mode == MCAST_INCLUDE) ||
374 (ims != NULL && ims->imsl_st[0] != mode))
375 return (MCAST_NOTSMEMBER);
376
377 return (MCAST_PASS);
378 }
379
380 /*
381 * Find and return a reference to an in_multi record for (ifp, group),
382 * and bump its reference count.
383 * If one does not exist, try to allocate it, and update link-layer multicast
384 * filters on ifp to listen for group.
385 * Assumes the IN_MULTI lock is held across the call.
386 * Return 0 if successful, otherwise return an appropriate error code.
387 */
388 static int
389 in_getmulti(struct ifnet *ifp, const struct in_addr *group,
390 struct in_multi **pinm)
391 {
392 struct sockaddr_in gsin;
393 struct ifmultiaddr *ifma;
394 struct in_ifinfo *ii;
395 struct in_multi *inm;
396 int error;
397
398 IN_MULTI_LOCK_ASSERT();
399
400 ii = (struct in_ifinfo *)ifp->if_afdata[AF_INET];
401
402 inm = inm_lookup(ifp, *group);
403 if (inm != NULL) {
404 /*
405 * If we already joined this group, just bump the
406 * refcount and return it.
407 */
408 KASSERT(inm->inm_refcount >= 1,
409 ("%s: bad refcount %d", __func__, inm->inm_refcount));
410 ++inm->inm_refcount;
411 *pinm = inm;
412 return (0);
413 }
414
415 memset(&gsin, 0, sizeof(gsin));
416 gsin.sin_family = AF_INET;
417 gsin.sin_len = sizeof(struct sockaddr_in);
418 gsin.sin_addr = *group;
419
420 /*
421 * Check if a link-layer group is already associated
422 * with this network-layer group on the given ifnet.
423 */
424 error = if_addmulti(ifp, (struct sockaddr *)&gsin, &ifma);
425 if (error != 0)
426 return (error);
427
428 /* XXX ifma_protospec must be covered by IF_ADDR_LOCK */
429 IF_ADDR_WLOCK(ifp);
430
431 /*
432 * If something other than netinet is occupying the link-layer
433 * group, print a meaningful error message and back out of
434 * the allocation.
435 * Otherwise, bump the refcount on the existing network-layer
436 * group association and return it.
437 */
438 if (ifma->ifma_protospec != NULL) {
439 inm = (struct in_multi *)ifma->ifma_protospec;
440 #ifdef INVARIANTS
441 KASSERT(ifma->ifma_addr != NULL, ("%s: no ifma_addr",
442 __func__));
443 KASSERT(ifma->ifma_addr->sa_family == AF_INET,
444 ("%s: ifma not AF_INET", __func__));
445 KASSERT(inm != NULL, ("%s: no ifma_protospec", __func__));
446 if (inm->inm_ifma != ifma || inm->inm_ifp != ifp ||
447 !in_hosteq(inm->inm_addr, *group))
448 panic("%s: ifma %p is inconsistent with %p (%s)",
449 __func__, ifma, inm, inet_ntoa(*group));
450 #endif
451 ++inm->inm_refcount;
452 *pinm = inm;
453 IF_ADDR_WUNLOCK(ifp);
454 return (0);
455 }
456
457 IF_ADDR_WLOCK_ASSERT(ifp);
458
459 /*
460 * A new in_multi record is needed; allocate and initialize it.
461 * We DO NOT perform an IGMP join as the in_ layer may need to
462 * push an initial source list down to IGMP to support SSM.
463 *
464 * The initial source filter state is INCLUDE, {} as per the RFC.
465 */
466 inm = malloc(sizeof(*inm), M_IPMADDR, M_NOWAIT | M_ZERO);
467 if (inm == NULL) {
468 if_delmulti_ifma(ifma);
469 IF_ADDR_WUNLOCK(ifp);
470 return (ENOMEM);
471 }
472 inm->inm_addr = *group;
473 inm->inm_ifp = ifp;
474 inm->inm_igi = ii->ii_igmp;
475 inm->inm_ifma = ifma;
476 inm->inm_refcount = 1;
477 inm->inm_state = IGMP_NOT_MEMBER;
478
479 /*
480 * Pending state-changes per group are subject to a bounds check.
481 */
482 IFQ_SET_MAXLEN(&inm->inm_scq, IGMP_MAX_STATE_CHANGES);
483
484 inm->inm_st[0].iss_fmode = MCAST_UNDEFINED;
485 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED;
486 RB_INIT(&inm->inm_srcs);
487
488 ifma->ifma_protospec = inm;
489
490 *pinm = inm;
491
492 IF_ADDR_WUNLOCK(ifp);
493 return (0);
494 }
495
496 /*
497 * Drop a reference to an in_multi record.
498 *
499 * If the refcount drops to 0, free the in_multi record and
500 * delete the underlying link-layer membership.
501 */
502 void
503 inm_release_locked(struct in_multi *inm)
504 {
505 struct ifmultiaddr *ifma;
506
507 IN_MULTI_LOCK_ASSERT();
508
509 CTR2(KTR_IGMPV3, "%s: refcount is %d", __func__, inm->inm_refcount);
510
511 if (--inm->inm_refcount > 0) {
512 CTR2(KTR_IGMPV3, "%s: refcount is now %d", __func__,
513 inm->inm_refcount);
514 return;
515 }
516
517 CTR2(KTR_IGMPV3, "%s: freeing inm %p", __func__, inm);
518
519 ifma = inm->inm_ifma;
520
521 /* XXX this access is not covered by IF_ADDR_LOCK */
522 CTR2(KTR_IGMPV3, "%s: purging ifma %p", __func__, ifma);
523 KASSERT(ifma->ifma_protospec == inm,
524 ("%s: ifma_protospec != inm", __func__));
525 ifma->ifma_protospec = NULL;
526
527 inm_purge(inm);
528
529 free(inm, M_IPMADDR);
530
531 if_delmulti_ifma(ifma);
532 }
533
534 /*
535 * Clear recorded source entries for a group.
536 * Used by the IGMP code. Caller must hold the IN_MULTI lock.
537 * FIXME: Should reap.
538 */
539 void
540 inm_clear_recorded(struct in_multi *inm)
541 {
542 struct ip_msource *ims;
543
544 IN_MULTI_LOCK_ASSERT();
545
546 RB_FOREACH(ims, ip_msource_tree, &inm->inm_srcs) {
547 if (ims->ims_stp) {
548 ims->ims_stp = 0;
549 --inm->inm_st[1].iss_rec;
550 }
551 }
552 KASSERT(inm->inm_st[1].iss_rec == 0,
553 ("%s: iss_rec %d not 0", __func__, inm->inm_st[1].iss_rec));
554 }
555
556 /*
557 * Record a source as pending for a Source-Group IGMPv3 query.
558 * This lives here as it modifies the shared tree.
559 *
560 * inm is the group descriptor.
561 * naddr is the address of the source to record in network-byte order.
562 *
563 * If the net.inet.igmp.sgalloc sysctl is non-zero, we will
564 * lazy-allocate a source node in response to an SG query.
565 * Otherwise, no allocation is performed. This saves some memory
566 * with the trade-off that the source will not be reported to the
567 * router if joined in the window between the query response and
568 * the group actually being joined on the local host.
569 *
570 * VIMAGE: XXX: Currently the igmp_sgalloc feature has been removed.
571 * This turns off the allocation of a recorded source entry if
572 * the group has not been joined.
573 *
574 * Return 0 if the source didn't exist or was already marked as recorded.
575 * Return 1 if the source was marked as recorded by this function.
576 * Return <0 if any error occured (negated errno code).
577 */
578 int
579 inm_record_source(struct in_multi *inm, const in_addr_t naddr)
580 {
581 struct ip_msource find;
582 struct ip_msource *ims, *nims;
583
584 IN_MULTI_LOCK_ASSERT();
585
586 find.ims_haddr = ntohl(naddr);
587 ims = RB_FIND(ip_msource_tree, &inm->inm_srcs, &find);
588 if (ims && ims->ims_stp)
589 return (0);
590 if (ims == NULL) {
591 if (inm->inm_nsrc == in_mcast_maxgrpsrc)
592 return (-ENOSPC);
593 nims = malloc(sizeof(struct ip_msource), M_IPMSOURCE,
594 M_NOWAIT | M_ZERO);
595 if (nims == NULL)
596 return (-ENOMEM);
597 nims->ims_haddr = find.ims_haddr;
598 RB_INSERT(ip_msource_tree, &inm->inm_srcs, nims);
599 ++inm->inm_nsrc;
600 ims = nims;
601 }
602
603 /*
604 * Mark the source as recorded and update the recorded
605 * source count.
606 */
607 ++ims->ims_stp;
608 ++inm->inm_st[1].iss_rec;
609
610 return (1);
611 }
612
613 /*
614 * Return a pointer to an in_msource owned by an in_mfilter,
615 * given its source address.
616 * Lazy-allocate if needed. If this is a new entry its filter state is
617 * undefined at t0.
618 *
619 * imf is the filter set being modified.
620 * haddr is the source address in *host* byte-order.
621 *
622 * SMPng: May be called with locks held; malloc must not block.
623 */
624 static int
625 imf_get_source(struct in_mfilter *imf, const struct sockaddr_in *psin,
626 struct in_msource **plims)
627 {
628 struct ip_msource find;
629 struct ip_msource *ims, *nims;
630 struct in_msource *lims;
631 int error;
632
633 error = 0;
634 ims = NULL;
635 lims = NULL;
636
637 /* key is host byte order */
638 find.ims_haddr = ntohl(psin->sin_addr.s_addr);
639 ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find);
640 lims = (struct in_msource *)ims;
641 if (lims == NULL) {
642 if (imf->imf_nsrc == in_mcast_maxsocksrc)
643 return (ENOSPC);
644 nims = malloc(sizeof(struct in_msource), M_INMFILTER,
645 M_NOWAIT | M_ZERO);
646 if (nims == NULL)
647 return (ENOMEM);
648 lims = (struct in_msource *)nims;
649 lims->ims_haddr = find.ims_haddr;
650 lims->imsl_st[0] = MCAST_UNDEFINED;
651 RB_INSERT(ip_msource_tree, &imf->imf_sources, nims);
652 ++imf->imf_nsrc;
653 }
654
655 *plims = lims;
656
657 return (error);
658 }
659
660 /*
661 * Graft a source entry into an existing socket-layer filter set,
662 * maintaining any required invariants and checking allocations.
663 *
664 * The source is marked as being in the new filter mode at t1.
665 *
666 * Return the pointer to the new node, otherwise return NULL.
667 */
668 static struct in_msource *
669 imf_graft(struct in_mfilter *imf, const uint8_t st1,
670 const struct sockaddr_in *psin)
671 {
672 struct ip_msource *nims;
673 struct in_msource *lims;
674
675 nims = malloc(sizeof(struct in_msource), M_INMFILTER,
676 M_NOWAIT | M_ZERO);
677 if (nims == NULL)
678 return (NULL);
679 lims = (struct in_msource *)nims;
680 lims->ims_haddr = ntohl(psin->sin_addr.s_addr);
681 lims->imsl_st[0] = MCAST_UNDEFINED;
682 lims->imsl_st[1] = st1;
683 RB_INSERT(ip_msource_tree, &imf->imf_sources, nims);
684 ++imf->imf_nsrc;
685
686 return (lims);
687 }
688
689 /*
690 * Prune a source entry from an existing socket-layer filter set,
691 * maintaining any required invariants and checking allocations.
692 *
693 * The source is marked as being left at t1, it is not freed.
694 *
695 * Return 0 if no error occurred, otherwise return an errno value.
696 */
697 static int
698 imf_prune(struct in_mfilter *imf, const struct sockaddr_in *psin)
699 {
700 struct ip_msource find;
701 struct ip_msource *ims;
702 struct in_msource *lims;
703
704 /* key is host byte order */
705 find.ims_haddr = ntohl(psin->sin_addr.s_addr);
706 ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find);
707 if (ims == NULL)
708 return (ENOENT);
709 lims = (struct in_msource *)ims;
710 lims->imsl_st[1] = MCAST_UNDEFINED;
711 return (0);
712 }
713
714 /*
715 * Revert socket-layer filter set deltas at t1 to t0 state.
716 */
717 static void
718 imf_rollback(struct in_mfilter *imf)
719 {
720 struct ip_msource *ims, *tims;
721 struct in_msource *lims;
722
723 RB_FOREACH_SAFE(ims, ip_msource_tree, &imf->imf_sources, tims) {
724 lims = (struct in_msource *)ims;
725 if (lims->imsl_st[0] == lims->imsl_st[1]) {
726 /* no change at t1 */
727 continue;
728 } else if (lims->imsl_st[0] != MCAST_UNDEFINED) {
729 /* revert change to existing source at t1 */
730 lims->imsl_st[1] = lims->imsl_st[0];
731 } else {
732 /* revert source added t1 */
733 CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims);
734 RB_REMOVE(ip_msource_tree, &imf->imf_sources, ims);
735 free(ims, M_INMFILTER);
736 imf->imf_nsrc--;
737 }
738 }
739 imf->imf_st[1] = imf->imf_st[0];
740 }
741
742 /*
743 * Mark socket-layer filter set as INCLUDE {} at t1.
744 */
745 static void
746 imf_leave(struct in_mfilter *imf)
747 {
748 struct ip_msource *ims;
749 struct in_msource *lims;
750
751 RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) {
752 lims = (struct in_msource *)ims;
753 lims->imsl_st[1] = MCAST_UNDEFINED;
754 }
755 imf->imf_st[1] = MCAST_INCLUDE;
756 }
757
758 /*
759 * Mark socket-layer filter set deltas as committed.
760 */
761 static void
762 imf_commit(struct in_mfilter *imf)
763 {
764 struct ip_msource *ims;
765 struct in_msource *lims;
766
767 RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) {
768 lims = (struct in_msource *)ims;
769 lims->imsl_st[0] = lims->imsl_st[1];
770 }
771 imf->imf_st[0] = imf->imf_st[1];
772 }
773
774 /*
775 * Reap unreferenced sources from socket-layer filter set.
776 */
777 static void
778 imf_reap(struct in_mfilter *imf)
779 {
780 struct ip_msource *ims, *tims;
781 struct in_msource *lims;
782
783 RB_FOREACH_SAFE(ims, ip_msource_tree, &imf->imf_sources, tims) {
784 lims = (struct in_msource *)ims;
785 if ((lims->imsl_st[0] == MCAST_UNDEFINED) &&
786 (lims->imsl_st[1] == MCAST_UNDEFINED)) {
787 CTR2(KTR_IGMPV3, "%s: free lims %p", __func__, ims);
788 RB_REMOVE(ip_msource_tree, &imf->imf_sources, ims);
789 free(ims, M_INMFILTER);
790 imf->imf_nsrc--;
791 }
792 }
793 }
794
795 /*
796 * Purge socket-layer filter set.
797 */
798 static void
799 imf_purge(struct in_mfilter *imf)
800 {
801 struct ip_msource *ims, *tims;
802
803 RB_FOREACH_SAFE(ims, ip_msource_tree, &imf->imf_sources, tims) {
804 CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims);
805 RB_REMOVE(ip_msource_tree, &imf->imf_sources, ims);
806 free(ims, M_INMFILTER);
807 imf->imf_nsrc--;
808 }
809 imf->imf_st[0] = imf->imf_st[1] = MCAST_UNDEFINED;
810 KASSERT(RB_EMPTY(&imf->imf_sources),
811 ("%s: imf_sources not empty", __func__));
812 }
813
814 /*
815 * Look up a source filter entry for a multicast group.
816 *
817 * inm is the group descriptor to work with.
818 * haddr is the host-byte-order IPv4 address to look up.
819 * noalloc may be non-zero to suppress allocation of sources.
820 * *pims will be set to the address of the retrieved or allocated source.
821 *
822 * SMPng: NOTE: may be called with locks held.
823 * Return 0 if successful, otherwise return a non-zero error code.
824 */
825 static int
826 inm_get_source(struct in_multi *inm, const in_addr_t haddr,
827 const int noalloc, struct ip_msource **pims)
828 {
829 struct ip_msource find;
830 struct ip_msource *ims, *nims;
831 #ifdef KTR
832 struct in_addr ia;
833 #endif
834
835 find.ims_haddr = haddr;
836 ims = RB_FIND(ip_msource_tree, &inm->inm_srcs, &find);
837 if (ims == NULL && !noalloc) {
838 if (inm->inm_nsrc == in_mcast_maxgrpsrc)
839 return (ENOSPC);
840 nims = malloc(sizeof(struct ip_msource), M_IPMSOURCE,
841 M_NOWAIT | M_ZERO);
842 if (nims == NULL)
843 return (ENOMEM);
844 nims->ims_haddr = haddr;
845 RB_INSERT(ip_msource_tree, &inm->inm_srcs, nims);
846 ++inm->inm_nsrc;
847 ims = nims;
848 #ifdef KTR
849 ia.s_addr = htonl(haddr);
850 CTR3(KTR_IGMPV3, "%s: allocated %s as %p", __func__,
851 inet_ntoa(ia), ims);
852 #endif
853 }
854
855 *pims = ims;
856 return (0);
857 }
858
859 /*
860 * Merge socket-layer source into IGMP-layer source.
861 * If rollback is non-zero, perform the inverse of the merge.
862 */
863 static void
864 ims_merge(struct ip_msource *ims, const struct in_msource *lims,
865 const int rollback)
866 {
867 int n = rollback ? -1 : 1;
868 #ifdef KTR
869 struct in_addr ia;
870
871 ia.s_addr = htonl(ims->ims_haddr);
872 #endif
873
874 if (lims->imsl_st[0] == MCAST_EXCLUDE) {
875 CTR3(KTR_IGMPV3, "%s: t1 ex -= %d on %s",
876 __func__, n, inet_ntoa(ia));
877 ims->ims_st[1].ex -= n;
878 } else if (lims->imsl_st[0] == MCAST_INCLUDE) {
879 CTR3(KTR_IGMPV3, "%s: t1 in -= %d on %s",
880 __func__, n, inet_ntoa(ia));
881 ims->ims_st[1].in -= n;
882 }
883
884 if (lims->imsl_st[1] == MCAST_EXCLUDE) {
885 CTR3(KTR_IGMPV3, "%s: t1 ex += %d on %s",
886 __func__, n, inet_ntoa(ia));
887 ims->ims_st[1].ex += n;
888 } else if (lims->imsl_st[1] == MCAST_INCLUDE) {
889 CTR3(KTR_IGMPV3, "%s: t1 in += %d on %s",
890 __func__, n, inet_ntoa(ia));
891 ims->ims_st[1].in += n;
892 }
893 }
894
895 /*
896 * Atomically update the global in_multi state, when a membership's
897 * filter list is being updated in any way.
898 *
899 * imf is the per-inpcb-membership group filter pointer.
900 * A fake imf may be passed for in-kernel consumers.
901 *
902 * XXX This is a candidate for a set-symmetric-difference style loop
903 * which would eliminate the repeated lookup from root of ims nodes,
904 * as they share the same key space.
905 *
906 * If any error occurred this function will back out of refcounts
907 * and return a non-zero value.
908 */
909 static int
910 inm_merge(struct in_multi *inm, /*const*/ struct in_mfilter *imf)
911 {
912 struct ip_msource *ims, *nims;
913 struct in_msource *lims;
914 int schanged, error;
915 int nsrc0, nsrc1;
916
917 schanged = 0;
918 error = 0;
919 nsrc1 = nsrc0 = 0;
920
921 /*
922 * Update the source filters first, as this may fail.
923 * Maintain count of in-mode filters at t0, t1. These are
924 * used to work out if we transition into ASM mode or not.
925 * Maintain a count of source filters whose state was
926 * actually modified by this operation.
927 */
928 RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) {
929 lims = (struct in_msource *)ims;
930 if (lims->imsl_st[0] == imf->imf_st[0]) nsrc0++;
931 if (lims->imsl_st[1] == imf->imf_st[1]) nsrc1++;
932 if (lims->imsl_st[0] == lims->imsl_st[1]) continue;
933 error = inm_get_source(inm, lims->ims_haddr, 0, &nims);
934 ++schanged;
935 if (error)
936 break;
937 ims_merge(nims, lims, 0);
938 }
939 if (error) {
940 struct ip_msource *bims;
941
942 RB_FOREACH_REVERSE_FROM(ims, ip_msource_tree, nims) {
943 lims = (struct in_msource *)ims;
944 if (lims->imsl_st[0] == lims->imsl_st[1])
945 continue;
946 (void)inm_get_source(inm, lims->ims_haddr, 1, &bims);
947 if (bims == NULL)
948 continue;
949 ims_merge(bims, lims, 1);
950 }
951 goto out_reap;
952 }
953
954 CTR3(KTR_IGMPV3, "%s: imf filters in-mode: %d at t0, %d at t1",
955 __func__, nsrc0, nsrc1);
956
957 /* Handle transition between INCLUDE {n} and INCLUDE {} on socket. */
958 if (imf->imf_st[0] == imf->imf_st[1] &&
959 imf->imf_st[1] == MCAST_INCLUDE) {
960 if (nsrc1 == 0) {
961 CTR1(KTR_IGMPV3, "%s: --in on inm at t1", __func__);
962 --inm->inm_st[1].iss_in;
963 }
964 }
965
966 /* Handle filter mode transition on socket. */
967 if (imf->imf_st[0] != imf->imf_st[1]) {
968 CTR3(KTR_IGMPV3, "%s: imf transition %d to %d",
969 __func__, imf->imf_st[0], imf->imf_st[1]);
970
971 if (imf->imf_st[0] == MCAST_EXCLUDE) {
972 CTR1(KTR_IGMPV3, "%s: --ex on inm at t1", __func__);
973 --inm->inm_st[1].iss_ex;
974 } else if (imf->imf_st[0] == MCAST_INCLUDE) {
975 CTR1(KTR_IGMPV3, "%s: --in on inm at t1", __func__);
976 --inm->inm_st[1].iss_in;
977 }
978
979 if (imf->imf_st[1] == MCAST_EXCLUDE) {
980 CTR1(KTR_IGMPV3, "%s: ex++ on inm at t1", __func__);
981 inm->inm_st[1].iss_ex++;
982 } else if (imf->imf_st[1] == MCAST_INCLUDE && nsrc1 > 0) {
983 CTR1(KTR_IGMPV3, "%s: in++ on inm at t1", __func__);
984 inm->inm_st[1].iss_in++;
985 }
986 }
987
988 /*
989 * Track inm filter state in terms of listener counts.
990 * If there are any exclusive listeners, stack-wide
991 * membership is exclusive.
992 * Otherwise, if only inclusive listeners, stack-wide is inclusive.
993 * If no listeners remain, state is undefined at t1,
994 * and the IGMP lifecycle for this group should finish.
995 */
996 if (inm->inm_st[1].iss_ex > 0) {
997 CTR1(KTR_IGMPV3, "%s: transition to EX", __func__);
998 inm->inm_st[1].iss_fmode = MCAST_EXCLUDE;
999 } else if (inm->inm_st[1].iss_in > 0) {
1000 CTR1(KTR_IGMPV3, "%s: transition to IN", __func__);
1001 inm->inm_st[1].iss_fmode = MCAST_INCLUDE;
1002 } else {
1003 CTR1(KTR_IGMPV3, "%s: transition to UNDEF", __func__);
1004 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED;
1005 }
1006
1007 /* Decrement ASM listener count on transition out of ASM mode. */
1008 if (imf->imf_st[0] == MCAST_EXCLUDE && nsrc0 == 0) {
1009 if ((imf->imf_st[1] != MCAST_EXCLUDE) ||
1010 (imf->imf_st[1] == MCAST_EXCLUDE && nsrc1 > 0))
1011 CTR1(KTR_IGMPV3, "%s: --asm on inm at t1", __func__);
1012 --inm->inm_st[1].iss_asm;
1013 }
1014
1015 /* Increment ASM listener count on transition to ASM mode. */
1016 if (imf->imf_st[1] == MCAST_EXCLUDE && nsrc1 == 0) {
1017 CTR1(KTR_IGMPV3, "%s: asm++ on inm at t1", __func__);
1018 inm->inm_st[1].iss_asm++;
1019 }
1020
1021 CTR3(KTR_IGMPV3, "%s: merged imf %p to inm %p", __func__, imf, inm);
1022 inm_print(inm);
1023
1024 out_reap:
1025 if (schanged > 0) {
1026 CTR1(KTR_IGMPV3, "%s: sources changed; reaping", __func__);
1027 inm_reap(inm);
1028 }
1029 return (error);
1030 }
1031
1032 /*
1033 * Mark an in_multi's filter set deltas as committed.
1034 * Called by IGMP after a state change has been enqueued.
1035 */
1036 void
1037 inm_commit(struct in_multi *inm)
1038 {
1039 struct ip_msource *ims;
1040
1041 CTR2(KTR_IGMPV3, "%s: commit inm %p", __func__, inm);
1042 CTR1(KTR_IGMPV3, "%s: pre commit:", __func__);
1043 inm_print(inm);
1044
1045 RB_FOREACH(ims, ip_msource_tree, &inm->inm_srcs) {
1046 ims->ims_st[0] = ims->ims_st[1];
1047 }
1048 inm->inm_st[0] = inm->inm_st[1];
1049 }
1050
1051 /*
1052 * Reap unreferenced nodes from an in_multi's filter set.
1053 */
1054 static void
1055 inm_reap(struct in_multi *inm)
1056 {
1057 struct ip_msource *ims, *tims;
1058
1059 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, tims) {
1060 if (ims->ims_st[0].ex > 0 || ims->ims_st[0].in > 0 ||
1061 ims->ims_st[1].ex > 0 || ims->ims_st[1].in > 0 ||
1062 ims->ims_stp != 0)
1063 continue;
1064 CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims);
1065 RB_REMOVE(ip_msource_tree, &inm->inm_srcs, ims);
1066 free(ims, M_IPMSOURCE);
1067 inm->inm_nsrc--;
1068 }
1069 }
1070
1071 /*
1072 * Purge all source nodes from an in_multi's filter set.
1073 */
1074 static void
1075 inm_purge(struct in_multi *inm)
1076 {
1077 struct ip_msource *ims, *tims;
1078
1079 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, tims) {
1080 CTR2(KTR_IGMPV3, "%s: free ims %p", __func__, ims);
1081 RB_REMOVE(ip_msource_tree, &inm->inm_srcs, ims);
1082 free(ims, M_IPMSOURCE);
1083 inm->inm_nsrc--;
1084 }
1085 }
1086
1087 /*
1088 * Join a multicast group; unlocked entry point.
1089 *
1090 * SMPng: XXX: in_joingroup() is called from in_control() when Giant
1091 * is not held. Fortunately, ifp is unlikely to have been detached
1092 * at this point, so we assume it's OK to recurse.
1093 */
1094 int
1095 in_joingroup(struct ifnet *ifp, const struct in_addr *gina,
1096 /*const*/ struct in_mfilter *imf, struct in_multi **pinm)
1097 {
1098 int error;
1099
1100 IN_MULTI_LOCK();
1101 error = in_joingroup_locked(ifp, gina, imf, pinm);
1102 IN_MULTI_UNLOCK();
1103
1104 return (error);
1105 }
1106
1107 /*
1108 * Join a multicast group; real entry point.
1109 *
1110 * Only preserves atomicity at inm level.
1111 * NOTE: imf argument cannot be const due to sys/tree.h limitations.
1112 *
1113 * If the IGMP downcall fails, the group is not joined, and an error
1114 * code is returned.
1115 */
1116 int
1117 in_joingroup_locked(struct ifnet *ifp, const struct in_addr *gina,
1118 /*const*/ struct in_mfilter *imf, struct in_multi **pinm)
1119 {
1120 struct in_mfilter timf;
1121 struct in_multi *inm;
1122 int error;
1123
1124 IN_MULTI_LOCK_ASSERT();
1125
1126 CTR4(KTR_IGMPV3, "%s: join %s on %p(%s))", __func__,
1127 inet_ntoa(*gina), ifp, ifp->if_xname);
1128
1129 error = 0;
1130 inm = NULL;
1131
1132 /*
1133 * If no imf was specified (i.e. kernel consumer),
1134 * fake one up and assume it is an ASM join.
1135 */
1136 if (imf == NULL) {
1137 imf_init(&timf, MCAST_UNDEFINED, MCAST_EXCLUDE);
1138 imf = &timf;
1139 }
1140
1141 error = in_getmulti(ifp, gina, &inm);
1142 if (error) {
1143 CTR1(KTR_IGMPV3, "%s: in_getmulti() failure", __func__);
1144 return (error);
1145 }
1146
1147 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
1148 error = inm_merge(inm, imf);
1149 if (error) {
1150 CTR1(KTR_IGMPV3, "%s: failed to merge inm state", __func__);
1151 goto out_inm_release;
1152 }
1153
1154 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
1155 error = igmp_change_state(inm);
1156 if (error) {
1157 CTR1(KTR_IGMPV3, "%s: failed to update source", __func__);
1158 goto out_inm_release;
1159 }
1160
1161 out_inm_release:
1162 if (error) {
1163 CTR2(KTR_IGMPV3, "%s: dropping ref on %p", __func__, inm);
1164 inm_release_locked(inm);
1165 } else {
1166 *pinm = inm;
1167 }
1168
1169 return (error);
1170 }
1171
1172 /*
1173 * Leave a multicast group; unlocked entry point.
1174 */
1175 int
1176 in_leavegroup(struct in_multi *inm, /*const*/ struct in_mfilter *imf)
1177 {
1178 struct ifnet *ifp;
1179 int error;
1180
1181 ifp = inm->inm_ifp;
1182
1183 IN_MULTI_LOCK();
1184 error = in_leavegroup_locked(inm, imf);
1185 IN_MULTI_UNLOCK();
1186
1187 return (error);
1188 }
1189
1190 /*
1191 * Leave a multicast group; real entry point.
1192 * All source filters will be expunged.
1193 *
1194 * Only preserves atomicity at inm level.
1195 *
1196 * Holding the write lock for the INP which contains imf
1197 * is highly advisable. We can't assert for it as imf does not
1198 * contain a back-pointer to the owning inp.
1199 *
1200 * Note: This is not the same as inm_release(*) as this function also
1201 * makes a state change downcall into IGMP.
1202 */
1203 int
1204 in_leavegroup_locked(struct in_multi *inm, /*const*/ struct in_mfilter *imf)
1205 {
1206 struct in_mfilter timf;
1207 int error;
1208
1209 error = 0;
1210
1211 IN_MULTI_LOCK_ASSERT();
1212
1213 CTR5(KTR_IGMPV3, "%s: leave inm %p, %s/%s, imf %p", __func__,
1214 inm, inet_ntoa(inm->inm_addr),
1215 (inm_is_ifp_detached(inm) ? "null" : inm->inm_ifp->if_xname),
1216 imf);
1217
1218 /*
1219 * If no imf was specified (i.e. kernel consumer),
1220 * fake one up and assume it is an ASM join.
1221 */
1222 if (imf == NULL) {
1223 imf_init(&timf, MCAST_EXCLUDE, MCAST_UNDEFINED);
1224 imf = &timf;
1225 }
1226
1227 /*
1228 * Begin state merge transaction at IGMP layer.
1229 *
1230 * As this particular invocation should not cause any memory
1231 * to be allocated, and there is no opportunity to roll back
1232 * the transaction, it MUST NOT fail.
1233 */
1234 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
1235 error = inm_merge(inm, imf);
1236 KASSERT(error == 0, ("%s: failed to merge inm state", __func__));
1237
1238 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
1239 error = igmp_change_state(inm);
1240 if (error)
1241 CTR1(KTR_IGMPV3, "%s: failed igmp downcall", __func__);
1242
1243 CTR2(KTR_IGMPV3, "%s: dropping ref on %p", __func__, inm);
1244 inm_release_locked(inm);
1245
1246 return (error);
1247 }
1248
1249 /*#ifndef BURN_BRIDGES*/
1250 /*
1251 * Join an IPv4 multicast group in (*,G) exclusive mode.
1252 * The group must be a 224.0.0.0/24 link-scope group.
1253 * This KPI is for legacy kernel consumers only.
1254 */
1255 struct in_multi *
1256 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1257 {
1258 struct in_multi *pinm;
1259 int error;
1260
1261 KASSERT(IN_LOCAL_GROUP(ntohl(ap->s_addr)),
1262 ("%s: %s not in 224.0.0.0/24", __func__, inet_ntoa(*ap)));
1263
1264 error = in_joingroup(ifp, ap, NULL, &pinm);
1265 if (error != 0)
1266 pinm = NULL;
1267
1268 return (pinm);
1269 }
1270
1271 /*
1272 * Leave an IPv4 multicast group, assumed to be in exclusive (*,G) mode.
1273 * This KPI is for legacy kernel consumers only.
1274 */
1275 void
1276 in_delmulti(struct in_multi *inm)
1277 {
1278
1279 (void)in_leavegroup(inm, NULL);
1280 }
1281 /*#endif*/
1282
1283 /*
1284 * Block or unblock an ASM multicast source on an inpcb.
1285 * This implements the delta-based API described in RFC 3678.
1286 *
1287 * The delta-based API applies only to exclusive-mode memberships.
1288 * An IGMP downcall will be performed.
1289 *
1290 * SMPng: NOTE: Must take Giant as a join may create a new ifma.
1291 *
1292 * Return 0 if successful, otherwise return an appropriate error code.
1293 */
1294 static int
1295 inp_block_unblock_source(struct inpcb *inp, struct sockopt *sopt)
1296 {
1297 struct group_source_req gsr;
1298 sockunion_t *gsa, *ssa;
1299 struct ifnet *ifp;
1300 struct in_mfilter *imf;
1301 struct ip_moptions *imo;
1302 struct in_msource *ims;
1303 struct in_multi *inm;
1304 size_t idx;
1305 uint16_t fmode;
1306 int error, doblock;
1307
1308 ifp = NULL;
1309 error = 0;
1310 doblock = 0;
1311
1312 memset(&gsr, 0, sizeof(struct group_source_req));
1313 gsa = (sockunion_t *)&gsr.gsr_group;
1314 ssa = (sockunion_t *)&gsr.gsr_source;
1315
1316 switch (sopt->sopt_name) {
1317 case IP_BLOCK_SOURCE:
1318 case IP_UNBLOCK_SOURCE: {
1319 struct ip_mreq_source mreqs;
1320
1321 error = sooptcopyin(sopt, &mreqs,
1322 sizeof(struct ip_mreq_source),
1323 sizeof(struct ip_mreq_source));
1324 if (error)
1325 return (error);
1326
1327 gsa->sin.sin_family = AF_INET;
1328 gsa->sin.sin_len = sizeof(struct sockaddr_in);
1329 gsa->sin.sin_addr = mreqs.imr_multiaddr;
1330
1331 ssa->sin.sin_family = AF_INET;
1332 ssa->sin.sin_len = sizeof(struct sockaddr_in);
1333 ssa->sin.sin_addr = mreqs.imr_sourceaddr;
1334
1335 if (!in_nullhost(mreqs.imr_interface))
1336 INADDR_TO_IFP(mreqs.imr_interface, ifp);
1337
1338 if (sopt->sopt_name == IP_BLOCK_SOURCE)
1339 doblock = 1;
1340
1341 CTR3(KTR_IGMPV3, "%s: imr_interface = %s, ifp = %p",
1342 __func__, inet_ntoa(mreqs.imr_interface), ifp);
1343 break;
1344 }
1345
1346 case MCAST_BLOCK_SOURCE:
1347 case MCAST_UNBLOCK_SOURCE:
1348 error = sooptcopyin(sopt, &gsr,
1349 sizeof(struct group_source_req),
1350 sizeof(struct group_source_req));
1351 if (error)
1352 return (error);
1353
1354 if (gsa->sin.sin_family != AF_INET ||
1355 gsa->sin.sin_len != sizeof(struct sockaddr_in))
1356 return (EINVAL);
1357
1358 if (ssa->sin.sin_family != AF_INET ||
1359 ssa->sin.sin_len != sizeof(struct sockaddr_in))
1360 return (EINVAL);
1361
1362 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1363 return (EADDRNOTAVAIL);
1364
1365 ifp = ifnet_byindex(gsr.gsr_interface);
1366
1367 if (sopt->sopt_name == MCAST_BLOCK_SOURCE)
1368 doblock = 1;
1369 break;
1370
1371 default:
1372 CTR2(KTR_IGMPV3, "%s: unknown sopt_name %d",
1373 __func__, sopt->sopt_name);
1374 return (EOPNOTSUPP);
1375 break;
1376 }
1377
1378 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
1379 return (EINVAL);
1380
1381 /*
1382 * Check if we are actually a member of this group.
1383 */
1384 imo = inp_findmoptions(inp);
1385 idx = imo_match_group(imo, ifp, &gsa->sa);
1386 if (idx == -1 || imo->imo_mfilters == NULL) {
1387 error = EADDRNOTAVAIL;
1388 goto out_inp_locked;
1389 }
1390
1391 KASSERT(imo->imo_mfilters != NULL,
1392 ("%s: imo_mfilters not allocated", __func__));
1393 imf = &imo->imo_mfilters[idx];
1394 inm = imo->imo_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->imf_st[0];
1401 if (fmode != MCAST_EXCLUDE) {
1402 error = EINVAL;
1403 goto out_inp_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 = imo_match_source(imo, idx, &ssa->sa);
1413 if ((ims != NULL && doblock) || (ims == NULL && !doblock)) {
1414 CTR3(KTR_IGMPV3, "%s: source %s %spresent", __func__,
1415 inet_ntoa(ssa->sin.sin_addr), doblock ? "" : "not ");
1416 error = EADDRNOTAVAIL;
1417 goto out_inp_locked;
1418 }
1419
1420 INP_WLOCK_ASSERT(inp);
1421
1422 /*
1423 * Begin state merge transaction at socket layer.
1424 */
1425 if (doblock) {
1426 CTR2(KTR_IGMPV3, "%s: %s source", __func__, "block");
1427 ims = imf_graft(imf, fmode, &ssa->sin);
1428 if (ims == NULL)
1429 error = ENOMEM;
1430 } else {
1431 CTR2(KTR_IGMPV3, "%s: %s source", __func__, "allow");
1432 error = imf_prune(imf, &ssa->sin);
1433 }
1434
1435 if (error) {
1436 CTR1(KTR_IGMPV3, "%s: merge imf state failed", __func__);
1437 goto out_imf_rollback;
1438 }
1439
1440 /*
1441 * Begin state merge transaction at IGMP layer.
1442 */
1443 IN_MULTI_LOCK();
1444
1445 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
1446 error = inm_merge(inm, imf);
1447 if (error) {
1448 CTR1(KTR_IGMPV3, "%s: failed to merge inm state", __func__);
1449 goto out_in_multi_locked;
1450 }
1451
1452 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
1453 error = igmp_change_state(inm);
1454 if (error)
1455 CTR1(KTR_IGMPV3, "%s: failed igmp downcall", __func__);
1456
1457 out_in_multi_locked:
1458
1459 IN_MULTI_UNLOCK();
1460
1461 out_imf_rollback:
1462 if (error)
1463 imf_rollback(imf);
1464 else
1465 imf_commit(imf);
1466
1467 imf_reap(imf);
1468
1469 out_inp_locked:
1470 INP_WUNLOCK(inp);
1471 return (error);
1472 }
1473
1474 /*
1475 * Given an inpcb, return its multicast options structure pointer. Accepts
1476 * an unlocked inpcb pointer, but will return it locked. May sleep.
1477 *
1478 * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
1479 * SMPng: NOTE: Returns with the INP write lock held.
1480 */
1481 static struct ip_moptions *
1482 inp_findmoptions(struct inpcb *inp)
1483 {
1484 struct ip_moptions *imo;
1485 struct in_multi **immp;
1486 struct in_mfilter *imfp;
1487 size_t idx;
1488
1489 INP_WLOCK(inp);
1490 if (inp->inp_moptions != NULL)
1491 return (inp->inp_moptions);
1492
1493 INP_WUNLOCK(inp);
1494
1495 imo = malloc(sizeof(*imo), M_IPMOPTS, M_WAITOK);
1496 immp = malloc(sizeof(*immp) * IP_MIN_MEMBERSHIPS, M_IPMOPTS,
1497 M_WAITOK | M_ZERO);
1498 imfp = malloc(sizeof(struct in_mfilter) * IP_MIN_MEMBERSHIPS,
1499 M_INMFILTER, M_WAITOK);
1500
1501 imo->imo_multicast_ifp = NULL;
1502 imo->imo_multicast_addr.s_addr = INADDR_ANY;
1503 imo->imo_multicast_vif = -1;
1504 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
1505 imo->imo_multicast_loop = in_mcast_loop;
1506 imo->imo_num_memberships = 0;
1507 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS;
1508 imo->imo_membership = immp;
1509
1510 /* Initialize per-group source filters. */
1511 for (idx = 0; idx < IP_MIN_MEMBERSHIPS; idx++)
1512 imf_init(&imfp[idx], MCAST_UNDEFINED, MCAST_EXCLUDE);
1513 imo->imo_mfilters = imfp;
1514
1515 INP_WLOCK(inp);
1516 if (inp->inp_moptions != NULL) {
1517 free(imfp, M_INMFILTER);
1518 free(immp, M_IPMOPTS);
1519 free(imo, M_IPMOPTS);
1520 return (inp->inp_moptions);
1521 }
1522 inp->inp_moptions = imo;
1523 return (imo);
1524 }
1525
1526 /*
1527 * Discard the IP multicast options (and source filters).
1528 *
1529 * SMPng: NOTE: assumes INP write lock is held.
1530 */
1531 void
1532 inp_freemoptions(struct ip_moptions *imo)
1533 {
1534 struct in_mfilter *imf;
1535 size_t idx, nmships;
1536
1537 KASSERT(imo != NULL, ("%s: ip_moptions is NULL", __func__));
1538
1539 nmships = imo->imo_num_memberships;
1540 for (idx = 0; idx < nmships; ++idx) {
1541 imf = imo->imo_mfilters ? &imo->imo_mfilters[idx] : NULL;
1542 if (imf)
1543 imf_leave(imf);
1544 (void)in_leavegroup(imo->imo_membership[idx], imf);
1545 if (imf)
1546 imf_purge(imf);
1547 }
1548
1549 if (imo->imo_mfilters)
1550 free(imo->imo_mfilters, M_INMFILTER);
1551 free(imo->imo_membership, M_IPMOPTS);
1552 free(imo, M_IPMOPTS);
1553 }
1554
1555 /*
1556 * Atomically get source filters on a socket for an IPv4 multicast group.
1557 * Called with INP lock held; returns with lock released.
1558 */
1559 static int
1560 inp_get_source_filters(struct inpcb *inp, struct sockopt *sopt)
1561 {
1562 struct __msfilterreq msfr;
1563 sockunion_t *gsa;
1564 struct ifnet *ifp;
1565 struct ip_moptions *imo;
1566 struct in_mfilter *imf;
1567 struct ip_msource *ims;
1568 struct in_msource *lims;
1569 struct sockaddr_in *psin;
1570 struct sockaddr_storage *ptss;
1571 struct sockaddr_storage *tss;
1572 int error;
1573 size_t idx, nsrcs, ncsrcs;
1574
1575 INP_WLOCK_ASSERT(inp);
1576
1577 imo = inp->inp_moptions;
1578 KASSERT(imo != NULL, ("%s: null ip_moptions", __func__));
1579
1580 INP_WUNLOCK(inp);
1581
1582 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
1583 sizeof(struct __msfilterreq));
1584 if (error)
1585 return (error);
1586
1587 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
1588 return (EINVAL);
1589
1590 ifp = ifnet_byindex(msfr.msfr_ifindex);
1591 if (ifp == NULL)
1592 return (EINVAL);
1593
1594 INP_WLOCK(inp);
1595
1596 /*
1597 * Lookup group on the socket.
1598 */
1599 gsa = (sockunion_t *)&msfr.msfr_group;
1600 idx = imo_match_group(imo, ifp, &gsa->sa);
1601 if (idx == -1 || imo->imo_mfilters == NULL) {
1602 INP_WUNLOCK(inp);
1603 return (EADDRNOTAVAIL);
1604 }
1605 imf = &imo->imo_mfilters[idx];
1606
1607 /*
1608 * Ignore memberships which are in limbo.
1609 */
1610 if (imf->imf_st[1] == MCAST_UNDEFINED) {
1611 INP_WUNLOCK(inp);
1612 return (EAGAIN);
1613 }
1614 msfr.msfr_fmode = imf->imf_st[1];
1615
1616 /*
1617 * If the user specified a buffer, copy out the source filter
1618 * entries to userland gracefully.
1619 * We only copy out the number of entries which userland
1620 * has asked for, but we always tell userland how big the
1621 * buffer really needs to be.
1622 */
1623 if (msfr.msfr_nsrcs > in_mcast_maxsocksrc)
1624 msfr.msfr_nsrcs = in_mcast_maxsocksrc;
1625 tss = NULL;
1626 if (msfr.msfr_srcs != NULL && msfr.msfr_nsrcs > 0) {
1627 tss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
1628 M_TEMP, M_NOWAIT | M_ZERO);
1629 if (tss == NULL) {
1630 INP_WUNLOCK(inp);
1631 return (ENOBUFS);
1632 }
1633 }
1634
1635 /*
1636 * Count number of sources in-mode at t0.
1637 * If buffer space exists and remains, copy out source entries.
1638 */
1639 nsrcs = msfr.msfr_nsrcs;
1640 ncsrcs = 0;
1641 ptss = tss;
1642 RB_FOREACH(ims, ip_msource_tree, &imf->imf_sources) {
1643 lims = (struct in_msource *)ims;
1644 if (lims->imsl_st[0] == MCAST_UNDEFINED ||
1645 lims->imsl_st[0] != imf->imf_st[0])
1646 continue;
1647 ++ncsrcs;
1648 if (tss != NULL && nsrcs > 0) {
1649 psin = (struct sockaddr_in *)ptss;
1650 psin->sin_family = AF_INET;
1651 psin->sin_len = sizeof(struct sockaddr_in);
1652 psin->sin_addr.s_addr = htonl(lims->ims_haddr);
1653 psin->sin_port = 0;
1654 ++ptss;
1655 --nsrcs;
1656 }
1657 }
1658
1659 INP_WUNLOCK(inp);
1660
1661 if (tss != NULL) {
1662 error = copyout(tss, msfr.msfr_srcs,
1663 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
1664 free(tss, M_TEMP);
1665 if (error)
1666 return (error);
1667 }
1668
1669 msfr.msfr_nsrcs = ncsrcs;
1670 error = sooptcopyout(sopt, &msfr, sizeof(struct __msfilterreq));
1671
1672 return (error);
1673 }
1674
1675 /*
1676 * Return the IP multicast options in response to user getsockopt().
1677 */
1678 int
1679 inp_getmoptions(struct inpcb *inp, struct sockopt *sopt)
1680 {
1681 struct ip_mreqn mreqn;
1682 struct ip_moptions *imo;
1683 struct ifnet *ifp;
1684 struct in_ifaddr *ia;
1685 int error, optval;
1686 u_char coptval;
1687
1688 INP_WLOCK(inp);
1689 imo = inp->inp_moptions;
1690 /*
1691 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
1692 * or is a divert socket, reject it.
1693 */
1694 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
1695 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
1696 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM)) {
1697 INP_WUNLOCK(inp);
1698 return (EOPNOTSUPP);
1699 }
1700
1701 error = 0;
1702 switch (sopt->sopt_name) {
1703 case IP_MULTICAST_VIF:
1704 if (imo != NULL)
1705 optval = imo->imo_multicast_vif;
1706 else
1707 optval = -1;
1708 INP_WUNLOCK(inp);
1709 error = sooptcopyout(sopt, &optval, sizeof(int));
1710 break;
1711
1712 case IP_MULTICAST_IF:
1713 memset(&mreqn, 0, sizeof(struct ip_mreqn));
1714 if (imo != NULL) {
1715 ifp = imo->imo_multicast_ifp;
1716 if (!in_nullhost(imo->imo_multicast_addr)) {
1717 mreqn.imr_address = imo->imo_multicast_addr;
1718 } else if (ifp != NULL) {
1719 mreqn.imr_ifindex = ifp->if_index;
1720 IFP_TO_IA(ifp, ia);
1721 if (ia != NULL) {
1722 mreqn.imr_address =
1723 IA_SIN(ia)->sin_addr;
1724 ifa_free(&ia->ia_ifa);
1725 }
1726 }
1727 }
1728 INP_WUNLOCK(inp);
1729 if (sopt->sopt_valsize == sizeof(struct ip_mreqn)) {
1730 error = sooptcopyout(sopt, &mreqn,
1731 sizeof(struct ip_mreqn));
1732 } else {
1733 error = sooptcopyout(sopt, &mreqn.imr_address,
1734 sizeof(struct in_addr));
1735 }
1736 break;
1737
1738 case IP_MULTICAST_TTL:
1739 if (imo == 0)
1740 optval = coptval = IP_DEFAULT_MULTICAST_TTL;
1741 else
1742 optval = coptval = imo->imo_multicast_ttl;
1743 INP_WUNLOCK(inp);
1744 if (sopt->sopt_valsize == sizeof(u_char))
1745 error = sooptcopyout(sopt, &coptval, sizeof(u_char));
1746 else
1747 error = sooptcopyout(sopt, &optval, sizeof(int));
1748 break;
1749
1750 case IP_MULTICAST_LOOP:
1751 if (imo == 0)
1752 optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
1753 else
1754 optval = coptval = imo->imo_multicast_loop;
1755 INP_WUNLOCK(inp);
1756 if (sopt->sopt_valsize == sizeof(u_char))
1757 error = sooptcopyout(sopt, &coptval, sizeof(u_char));
1758 else
1759 error = sooptcopyout(sopt, &optval, sizeof(int));
1760 break;
1761
1762 case IP_MSFILTER:
1763 if (imo == NULL) {
1764 error = EADDRNOTAVAIL;
1765 INP_WUNLOCK(inp);
1766 } else {
1767 error = inp_get_source_filters(inp, sopt);
1768 }
1769 break;
1770
1771 default:
1772 INP_WUNLOCK(inp);
1773 error = ENOPROTOOPT;
1774 break;
1775 }
1776
1777 INP_UNLOCK_ASSERT(inp);
1778
1779 return (error);
1780 }
1781
1782 /*
1783 * Look up the ifnet to use for a multicast group membership,
1784 * given the IPv4 address of an interface, and the IPv4 group address.
1785 *
1786 * This routine exists to support legacy multicast applications
1787 * which do not understand that multicast memberships are scoped to
1788 * specific physical links in the networking stack, or which need
1789 * to join link-scope groups before IPv4 addresses are configured.
1790 *
1791 * If inp is non-NULL, use this socket's current FIB number for any
1792 * required FIB lookup.
1793 * If ina is INADDR_ANY, look up the group address in the unicast FIB,
1794 * and use its ifp; usually, this points to the default next-hop.
1795 *
1796 * If the FIB lookup fails, attempt to use the first non-loopback
1797 * interface with multicast capability in the system as a
1798 * last resort. The legacy IPv4 ASM API requires that we do
1799 * this in order to allow groups to be joined when the routing
1800 * table has not yet been populated during boot.
1801 *
1802 * Returns NULL if no ifp could be found.
1803 *
1804 * SMPng: TODO: Acquire the appropriate locks for INADDR_TO_IFP.
1805 * FUTURE: Implement IPv4 source-address selection.
1806 */
1807 static struct ifnet *
1808 inp_lookup_mcast_ifp(const struct inpcb *inp,
1809 const struct sockaddr_in *gsin, const struct in_addr ina)
1810 {
1811 struct ifnet *ifp;
1812
1813 KASSERT(gsin->sin_family == AF_INET, ("%s: not AF_INET", __func__));
1814 KASSERT(IN_MULTICAST(ntohl(gsin->sin_addr.s_addr)),
1815 ("%s: not multicast", __func__));
1816
1817 ifp = NULL;
1818 if (!in_nullhost(ina)) {
1819 INADDR_TO_IFP(ina, ifp);
1820 } else {
1821 struct route ro;
1822
1823 ro.ro_rt = NULL;
1824 memcpy(&ro.ro_dst, gsin, sizeof(struct sockaddr_in));
1825 in_rtalloc_ign(&ro, 0, inp ? inp->inp_inc.inc_fibnum : 0);
1826 if (ro.ro_rt != NULL) {
1827 ifp = ro.ro_rt->rt_ifp;
1828 KASSERT(ifp != NULL, ("%s: null ifp", __func__));
1829 RTFREE(ro.ro_rt);
1830 } else {
1831 struct in_ifaddr *ia;
1832 struct ifnet *mifp;
1833
1834 mifp = NULL;
1835 IN_IFADDR_RLOCK();
1836 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1837 mifp = ia->ia_ifp;
1838 if (!(mifp->if_flags & IFF_LOOPBACK) &&
1839 (mifp->if_flags & IFF_MULTICAST)) {
1840 ifp = mifp;
1841 break;
1842 }
1843 }
1844 IN_IFADDR_RUNLOCK();
1845 }
1846 }
1847
1848 return (ifp);
1849 }
1850
1851 /*
1852 * Join an IPv4 multicast group, possibly with a source.
1853 */
1854 static int
1855 inp_join_group(struct inpcb *inp, struct sockopt *sopt)
1856 {
1857 struct group_source_req gsr;
1858 sockunion_t *gsa, *ssa;
1859 struct ifnet *ifp;
1860 struct in_mfilter *imf;
1861 struct ip_moptions *imo;
1862 struct in_multi *inm;
1863 struct in_msource *lims;
1864 size_t idx;
1865 int error, is_new;
1866
1867 ifp = NULL;
1868 imf = NULL;
1869 lims = NULL;
1870 error = 0;
1871 is_new = 0;
1872
1873 memset(&gsr, 0, sizeof(struct group_source_req));
1874 gsa = (sockunion_t *)&gsr.gsr_group;
1875 gsa->ss.ss_family = AF_UNSPEC;
1876 ssa = (sockunion_t *)&gsr.gsr_source;
1877 ssa->ss.ss_family = AF_UNSPEC;
1878
1879 switch (sopt->sopt_name) {
1880 case IP_ADD_MEMBERSHIP:
1881 case IP_ADD_SOURCE_MEMBERSHIP: {
1882 struct ip_mreq_source mreqs;
1883
1884 if (sopt->sopt_name == IP_ADD_MEMBERSHIP) {
1885 error = sooptcopyin(sopt, &mreqs,
1886 sizeof(struct ip_mreq),
1887 sizeof(struct ip_mreq));
1888 /*
1889 * Do argument switcharoo from ip_mreq into
1890 * ip_mreq_source to avoid using two instances.
1891 */
1892 mreqs.imr_interface = mreqs.imr_sourceaddr;
1893 mreqs.imr_sourceaddr.s_addr = INADDR_ANY;
1894 } else if (sopt->sopt_name == IP_ADD_SOURCE_MEMBERSHIP) {
1895 error = sooptcopyin(sopt, &mreqs,
1896 sizeof(struct ip_mreq_source),
1897 sizeof(struct ip_mreq_source));
1898 }
1899 if (error)
1900 return (error);
1901
1902 gsa->sin.sin_family = AF_INET;
1903 gsa->sin.sin_len = sizeof(struct sockaddr_in);
1904 gsa->sin.sin_addr = mreqs.imr_multiaddr;
1905
1906 if (sopt->sopt_name == IP_ADD_SOURCE_MEMBERSHIP) {
1907 ssa->sin.sin_family = AF_INET;
1908 ssa->sin.sin_len = sizeof(struct sockaddr_in);
1909 ssa->sin.sin_addr = mreqs.imr_sourceaddr;
1910 }
1911
1912 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
1913 return (EINVAL);
1914
1915 ifp = inp_lookup_mcast_ifp(inp, &gsa->sin,
1916 mreqs.imr_interface);
1917 CTR3(KTR_IGMPV3, "%s: imr_interface = %s, ifp = %p",
1918 __func__, inet_ntoa(mreqs.imr_interface), ifp);
1919 break;
1920 }
1921
1922 case MCAST_JOIN_GROUP:
1923 case MCAST_JOIN_SOURCE_GROUP:
1924 if (sopt->sopt_name == MCAST_JOIN_GROUP) {
1925 error = sooptcopyin(sopt, &gsr,
1926 sizeof(struct group_req),
1927 sizeof(struct group_req));
1928 } else if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1929 error = sooptcopyin(sopt, &gsr,
1930 sizeof(struct group_source_req),
1931 sizeof(struct group_source_req));
1932 }
1933 if (error)
1934 return (error);
1935
1936 if (gsa->sin.sin_family != AF_INET ||
1937 gsa->sin.sin_len != sizeof(struct sockaddr_in))
1938 return (EINVAL);
1939
1940 /*
1941 * Overwrite the port field if present, as the sockaddr
1942 * being copied in may be matched with a binary comparison.
1943 */
1944 gsa->sin.sin_port = 0;
1945 if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1946 if (ssa->sin.sin_family != AF_INET ||
1947 ssa->sin.sin_len != sizeof(struct sockaddr_in))
1948 return (EINVAL);
1949 ssa->sin.sin_port = 0;
1950 }
1951
1952 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
1953 return (EINVAL);
1954
1955 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1956 return (EADDRNOTAVAIL);
1957 ifp = ifnet_byindex(gsr.gsr_interface);
1958 break;
1959
1960 default:
1961 CTR2(KTR_IGMPV3, "%s: unknown sopt_name %d",
1962 __func__, sopt->sopt_name);
1963 return (EOPNOTSUPP);
1964 break;
1965 }
1966
1967 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0)
1968 return (EADDRNOTAVAIL);
1969
1970 imo = inp_findmoptions(inp);
1971 idx = imo_match_group(imo, ifp, &gsa->sa);
1972 if (idx == -1) {
1973 is_new = 1;
1974 } else {
1975 inm = imo->imo_membership[idx];
1976 imf = &imo->imo_mfilters[idx];
1977 if (ssa->ss.ss_family != AF_UNSPEC) {
1978 /*
1979 * MCAST_JOIN_SOURCE_GROUP on an exclusive membership
1980 * is an error. On an existing inclusive membership,
1981 * it just adds the source to the filter list.
1982 */
1983 if (imf->imf_st[1] != MCAST_INCLUDE) {
1984 error = EINVAL;
1985 goto out_inp_locked;
1986 }
1987 /*
1988 * Throw out duplicates.
1989 *
1990 * XXX FIXME: This makes a naive assumption that
1991 * even if entries exist for *ssa in this imf,
1992 * they will be rejected as dupes, even if they
1993 * are not valid in the current mode (in-mode).
1994 *
1995 * in_msource is transactioned just as for anything
1996 * else in SSM -- but note naive use of inm_graft()
1997 * below for allocating new filter entries.
1998 *
1999 * This is only an issue if someone mixes the
2000 * full-state SSM API with the delta-based API,
2001 * which is discouraged in the relevant RFCs.
2002 */
2003 lims = imo_match_source(imo, idx, &ssa->sa);
2004 if (lims != NULL /*&&
2005 lims->imsl_st[1] == MCAST_INCLUDE*/) {
2006 error = EADDRNOTAVAIL;
2007 goto out_inp_locked;
2008 }
2009 } else {
2010 /*
2011 * MCAST_JOIN_GROUP on an existing exclusive
2012 * membership is an error; return EADDRINUSE
2013 * to preserve 4.4BSD API idempotence, and
2014 * avoid tedious detour to code below.
2015 * NOTE: This is bending RFC 3678 a bit.
2016 *
2017 * On an existing inclusive membership, this is also
2018 * an error; if you want to change filter mode,
2019 * you must use the userland API setsourcefilter().
2020 * XXX We don't reject this for imf in UNDEFINED
2021 * state at t1, because allocation of a filter
2022 * is atomic with allocation of a membership.
2023 */
2024 error = EINVAL;
2025 if (imf->imf_st[1] == MCAST_EXCLUDE)
2026 error = EADDRINUSE;
2027 goto out_inp_locked;
2028 }
2029 }
2030
2031 /*
2032 * Begin state merge transaction at socket layer.
2033 */
2034 INP_WLOCK_ASSERT(inp);
2035
2036 if (is_new) {
2037 if (imo->imo_num_memberships == imo->imo_max_memberships) {
2038 error = imo_grow(imo);
2039 if (error)
2040 goto out_inp_locked;
2041 }
2042 /*
2043 * Allocate the new slot upfront so we can deal with
2044 * grafting the new source filter in same code path
2045 * as for join-source on existing membership.
2046 */
2047 idx = imo->imo_num_memberships;
2048 imo->imo_membership[idx] = NULL;
2049 imo->imo_num_memberships++;
2050 KASSERT(imo->imo_mfilters != NULL,
2051 ("%s: imf_mfilters vector was not allocated", __func__));
2052 imf = &imo->imo_mfilters[idx];
2053 KASSERT(RB_EMPTY(&imf->imf_sources),
2054 ("%s: imf_sources not empty", __func__));
2055 }
2056
2057 /*
2058 * Graft new source into filter list for this inpcb's
2059 * membership of the group. The in_multi may not have
2060 * been allocated yet if this is a new membership, however,
2061 * the in_mfilter slot will be allocated and must be initialized.
2062 *
2063 * Note: Grafting of exclusive mode filters doesn't happen
2064 * in this path.
2065 * XXX: Should check for non-NULL lims (node exists but may
2066 * not be in-mode) for interop with full-state API.
2067 */
2068 if (ssa->ss.ss_family != AF_UNSPEC) {
2069 /* Membership starts in IN mode */
2070 if (is_new) {
2071 CTR1(KTR_IGMPV3, "%s: new join w/source", __func__);
2072 imf_init(imf, MCAST_UNDEFINED, MCAST_INCLUDE);
2073 } else {
2074 CTR2(KTR_IGMPV3, "%s: %s source", __func__, "allow");
2075 }
2076 lims = imf_graft(imf, MCAST_INCLUDE, &ssa->sin);
2077 if (lims == NULL) {
2078 CTR1(KTR_IGMPV3, "%s: merge imf state failed",
2079 __func__);
2080 error = ENOMEM;
2081 goto out_imo_free;
2082 }
2083 } else {
2084 /* No address specified; Membership starts in EX mode */
2085 if (is_new) {
2086 CTR1(KTR_IGMPV3, "%s: new join w/o source", __func__);
2087 imf_init(imf, MCAST_UNDEFINED, MCAST_EXCLUDE);
2088 }
2089 }
2090
2091 /*
2092 * Begin state merge transaction at IGMP layer.
2093 */
2094 IN_MULTI_LOCK();
2095
2096 if (is_new) {
2097 error = in_joingroup_locked(ifp, &gsa->sin.sin_addr, imf,
2098 &inm);
2099 if (error) {
2100 CTR1(KTR_IGMPV3, "%s: in_joingroup_locked failed",
2101 __func__);
2102 IN_MULTI_UNLOCK();
2103 goto out_imo_free;
2104 }
2105 imo->imo_membership[idx] = inm;
2106 } else {
2107 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
2108 error = inm_merge(inm, imf);
2109 if (error) {
2110 CTR1(KTR_IGMPV3, "%s: failed to merge inm state",
2111 __func__);
2112 goto out_in_multi_locked;
2113 }
2114 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
2115 error = igmp_change_state(inm);
2116 if (error) {
2117 CTR1(KTR_IGMPV3, "%s: failed igmp downcall",
2118 __func__);
2119 goto out_in_multi_locked;
2120 }
2121 }
2122
2123 out_in_multi_locked:
2124
2125 IN_MULTI_UNLOCK();
2126
2127 INP_WLOCK_ASSERT(inp);
2128 if (error) {
2129 imf_rollback(imf);
2130 if (is_new)
2131 imf_purge(imf);
2132 else
2133 imf_reap(imf);
2134 } else {
2135 imf_commit(imf);
2136 }
2137
2138 out_imo_free:
2139 if (error && is_new) {
2140 imo->imo_membership[idx] = NULL;
2141 --imo->imo_num_memberships;
2142 }
2143
2144 out_inp_locked:
2145 INP_WUNLOCK(inp);
2146 return (error);
2147 }
2148
2149 /*
2150 * Leave an IPv4 multicast group on an inpcb, possibly with a source.
2151 */
2152 static int
2153 inp_leave_group(struct inpcb *inp, struct sockopt *sopt)
2154 {
2155 struct group_source_req gsr;
2156 struct ip_mreq_source mreqs;
2157 sockunion_t *gsa, *ssa;
2158 struct ifnet *ifp;
2159 struct in_mfilter *imf;
2160 struct ip_moptions *imo;
2161 struct in_msource *ims;
2162 struct in_multi *inm;
2163 size_t idx;
2164 int error, is_final;
2165
2166 ifp = NULL;
2167 error = 0;
2168 is_final = 1;
2169
2170 memset(&gsr, 0, sizeof(struct group_source_req));
2171 gsa = (sockunion_t *)&gsr.gsr_group;
2172 gsa->ss.ss_family = AF_UNSPEC;
2173 ssa = (sockunion_t *)&gsr.gsr_source;
2174 ssa->ss.ss_family = AF_UNSPEC;
2175
2176 switch (sopt->sopt_name) {
2177 case IP_DROP_MEMBERSHIP:
2178 case IP_DROP_SOURCE_MEMBERSHIP:
2179 if (sopt->sopt_name == IP_DROP_MEMBERSHIP) {
2180 error = sooptcopyin(sopt, &mreqs,
2181 sizeof(struct ip_mreq),
2182 sizeof(struct ip_mreq));
2183 /*
2184 * Swap interface and sourceaddr arguments,
2185 * as ip_mreq and ip_mreq_source are laid
2186 * out differently.
2187 */
2188 mreqs.imr_interface = mreqs.imr_sourceaddr;
2189 mreqs.imr_sourceaddr.s_addr = INADDR_ANY;
2190 } else if (sopt->sopt_name == IP_DROP_SOURCE_MEMBERSHIP) {
2191 error = sooptcopyin(sopt, &mreqs,
2192 sizeof(struct ip_mreq_source),
2193 sizeof(struct ip_mreq_source));
2194 }
2195 if (error)
2196 return (error);
2197
2198 gsa->sin.sin_family = AF_INET;
2199 gsa->sin.sin_len = sizeof(struct sockaddr_in);
2200 gsa->sin.sin_addr = mreqs.imr_multiaddr;
2201
2202 if (sopt->sopt_name == IP_DROP_SOURCE_MEMBERSHIP) {
2203 ssa->sin.sin_family = AF_INET;
2204 ssa->sin.sin_len = sizeof(struct sockaddr_in);
2205 ssa->sin.sin_addr = mreqs.imr_sourceaddr;
2206 }
2207
2208 /*
2209 * Attempt to look up hinted ifp from interface address.
2210 * Fallthrough with null ifp iff lookup fails, to
2211 * preserve 4.4BSD mcast API idempotence.
2212 * XXX NOTE WELL: The RFC 3678 API is preferred because
2213 * using an IPv4 address as a key is racy.
2214 */
2215 if (!in_nullhost(mreqs.imr_interface))
2216 INADDR_TO_IFP(mreqs.imr_interface, ifp);
2217
2218 CTR3(KTR_IGMPV3, "%s: imr_interface = %s, ifp = %p",
2219 __func__, inet_ntoa(mreqs.imr_interface), ifp);
2220
2221 break;
2222
2223 case MCAST_LEAVE_GROUP:
2224 case MCAST_LEAVE_SOURCE_GROUP:
2225 if (sopt->sopt_name == MCAST_LEAVE_GROUP) {
2226 error = sooptcopyin(sopt, &gsr,
2227 sizeof(struct group_req),
2228 sizeof(struct group_req));
2229 } else if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2230 error = sooptcopyin(sopt, &gsr,
2231 sizeof(struct group_source_req),
2232 sizeof(struct group_source_req));
2233 }
2234 if (error)
2235 return (error);
2236
2237 if (gsa->sin.sin_family != AF_INET ||
2238 gsa->sin.sin_len != sizeof(struct sockaddr_in))
2239 return (EINVAL);
2240
2241 if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
2242 if (ssa->sin.sin_family != AF_INET ||
2243 ssa->sin.sin_len != sizeof(struct sockaddr_in))
2244 return (EINVAL);
2245 }
2246
2247 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
2248 return (EADDRNOTAVAIL);
2249
2250 ifp = ifnet_byindex(gsr.gsr_interface);
2251
2252 if (ifp == NULL)
2253 return (EADDRNOTAVAIL);
2254 break;
2255
2256 default:
2257 CTR2(KTR_IGMPV3, "%s: unknown sopt_name %d",
2258 __func__, sopt->sopt_name);
2259 return (EOPNOTSUPP);
2260 break;
2261 }
2262
2263 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
2264 return (EINVAL);
2265
2266 /*
2267 * Find the membership in the membership array.
2268 */
2269 imo = inp_findmoptions(inp);
2270 idx = imo_match_group(imo, ifp, &gsa->sa);
2271 if (idx == -1) {
2272 error = EADDRNOTAVAIL;
2273 goto out_inp_locked;
2274 }
2275 inm = imo->imo_membership[idx];
2276 imf = &imo->imo_mfilters[idx];
2277
2278 if (ssa->ss.ss_family != AF_UNSPEC)
2279 is_final = 0;
2280
2281 /*
2282 * Begin state merge transaction at socket layer.
2283 */
2284 INP_WLOCK_ASSERT(inp);
2285
2286 /*
2287 * If we were instructed only to leave a given source, do so.
2288 * MCAST_LEAVE_SOURCE_GROUP is only valid for inclusive memberships.
2289 */
2290 if (is_final) {
2291 imf_leave(imf);
2292 } else {
2293 if (imf->imf_st[0] == MCAST_EXCLUDE) {
2294 error = EADDRNOTAVAIL;
2295 goto out_inp_locked;
2296 }
2297 ims = imo_match_source(imo, idx, &ssa->sa);
2298 if (ims == NULL) {
2299 CTR3(KTR_IGMPV3, "%s: source %s %spresent", __func__,
2300 inet_ntoa(ssa->sin.sin_addr), "not ");
2301 error = EADDRNOTAVAIL;
2302 goto out_inp_locked;
2303 }
2304 CTR2(KTR_IGMPV3, "%s: %s source", __func__, "block");
2305 error = imf_prune(imf, &ssa->sin);
2306 if (error) {
2307 CTR1(KTR_IGMPV3, "%s: merge imf state failed",
2308 __func__);
2309 goto out_inp_locked;
2310 }
2311 }
2312
2313 /*
2314 * Begin state merge transaction at IGMP layer.
2315 */
2316 IN_MULTI_LOCK();
2317
2318 if (is_final) {
2319 /*
2320 * Give up the multicast address record to which
2321 * the membership points.
2322 */
2323 (void)in_leavegroup_locked(inm, imf);
2324 } else {
2325 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
2326 error = inm_merge(inm, imf);
2327 if (error) {
2328 CTR1(KTR_IGMPV3, "%s: failed to merge inm state",
2329 __func__);
2330 goto out_in_multi_locked;
2331 }
2332
2333 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
2334 error = igmp_change_state(inm);
2335 if (error) {
2336 CTR1(KTR_IGMPV3, "%s: failed igmp downcall",
2337 __func__);
2338 }
2339 }
2340
2341 out_in_multi_locked:
2342
2343 IN_MULTI_UNLOCK();
2344
2345 if (error)
2346 imf_rollback(imf);
2347 else
2348 imf_commit(imf);
2349
2350 imf_reap(imf);
2351
2352 if (is_final) {
2353 /* Remove the gap in the membership and filter array. */
2354 for (++idx; idx < imo->imo_num_memberships; ++idx) {
2355 imo->imo_membership[idx-1] = imo->imo_membership[idx];
2356 imo->imo_mfilters[idx-1] = imo->imo_mfilters[idx];
2357 }
2358 imo->imo_num_memberships--;
2359 }
2360
2361 out_inp_locked:
2362 INP_WUNLOCK(inp);
2363 return (error);
2364 }
2365
2366 /*
2367 * Select the interface for transmitting IPv4 multicast datagrams.
2368 *
2369 * Either an instance of struct in_addr or an instance of struct ip_mreqn
2370 * may be passed to this socket option. An address of INADDR_ANY or an
2371 * interface index of 0 is used to remove a previous selection.
2372 * When no interface is selected, one is chosen for every send.
2373 */
2374 static int
2375 inp_set_multicast_if(struct inpcb *inp, struct sockopt *sopt)
2376 {
2377 struct in_addr addr;
2378 struct ip_mreqn mreqn;
2379 struct ifnet *ifp;
2380 struct ip_moptions *imo;
2381 int error;
2382
2383 if (sopt->sopt_valsize == sizeof(struct ip_mreqn)) {
2384 /*
2385 * An interface index was specified using the
2386 * Linux-derived ip_mreqn structure.
2387 */
2388 error = sooptcopyin(sopt, &mreqn, sizeof(struct ip_mreqn),
2389 sizeof(struct ip_mreqn));
2390 if (error)
2391 return (error);
2392
2393 if (mreqn.imr_ifindex < 0 || V_if_index < mreqn.imr_ifindex)
2394 return (EINVAL);
2395
2396 if (mreqn.imr_ifindex == 0) {
2397 ifp = NULL;
2398 } else {
2399 ifp = ifnet_byindex(mreqn.imr_ifindex);
2400 if (ifp == NULL)
2401 return (EADDRNOTAVAIL);
2402 }
2403 } else {
2404 /*
2405 * An interface was specified by IPv4 address.
2406 * This is the traditional BSD usage.
2407 */
2408 error = sooptcopyin(sopt, &addr, sizeof(struct in_addr),
2409 sizeof(struct in_addr));
2410 if (error)
2411 return (error);
2412 if (in_nullhost(addr)) {
2413 ifp = NULL;
2414 } else {
2415 INADDR_TO_IFP(addr, ifp);
2416 if (ifp == NULL)
2417 return (EADDRNOTAVAIL);
2418 }
2419 CTR3(KTR_IGMPV3, "%s: ifp = %p, addr = %s", __func__, ifp,
2420 inet_ntoa(addr));
2421 }
2422
2423 /* Reject interfaces which do not support multicast. */
2424 if (ifp != NULL && (ifp->if_flags & IFF_MULTICAST) == 0)
2425 return (EOPNOTSUPP);
2426
2427 imo = inp_findmoptions(inp);
2428 imo->imo_multicast_ifp = ifp;
2429 imo->imo_multicast_addr.s_addr = INADDR_ANY;
2430 INP_WUNLOCK(inp);
2431
2432 return (0);
2433 }
2434
2435 /*
2436 * Atomically set source filters on a socket for an IPv4 multicast group.
2437 *
2438 * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
2439 */
2440 static int
2441 inp_set_source_filters(struct inpcb *inp, struct sockopt *sopt)
2442 {
2443 struct __msfilterreq msfr;
2444 sockunion_t *gsa;
2445 struct ifnet *ifp;
2446 struct in_mfilter *imf;
2447 struct ip_moptions *imo;
2448 struct in_multi *inm;
2449 size_t idx;
2450 int error;
2451
2452 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
2453 sizeof(struct __msfilterreq));
2454 if (error)
2455 return (error);
2456
2457 if (msfr.msfr_nsrcs > in_mcast_maxsocksrc)
2458 return (ENOBUFS);
2459
2460 if ((msfr.msfr_fmode != MCAST_EXCLUDE &&
2461 msfr.msfr_fmode != MCAST_INCLUDE))
2462 return (EINVAL);
2463
2464 if (msfr.msfr_group.ss_family != AF_INET ||
2465 msfr.msfr_group.ss_len != sizeof(struct sockaddr_in))
2466 return (EINVAL);
2467
2468 gsa = (sockunion_t *)&msfr.msfr_group;
2469 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
2470 return (EINVAL);
2471
2472 gsa->sin.sin_port = 0; /* ignore port */
2473
2474 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
2475 return (EADDRNOTAVAIL);
2476
2477 ifp = ifnet_byindex(msfr.msfr_ifindex);
2478 if (ifp == NULL)
2479 return (EADDRNOTAVAIL);
2480
2481 /*
2482 * Take the INP write lock.
2483 * Check if this socket is a member of this group.
2484 */
2485 imo = inp_findmoptions(inp);
2486 idx = imo_match_group(imo, ifp, &gsa->sa);
2487 if (idx == -1 || imo->imo_mfilters == NULL) {
2488 error = EADDRNOTAVAIL;
2489 goto out_inp_locked;
2490 }
2491 inm = imo->imo_membership[idx];
2492 imf = &imo->imo_mfilters[idx];
2493
2494 /*
2495 * Begin state merge transaction at socket layer.
2496 */
2497 INP_WLOCK_ASSERT(inp);
2498
2499 imf->imf_st[1] = msfr.msfr_fmode;
2500
2501 /*
2502 * Apply any new source filters, if present.
2503 * Make a copy of the user-space source vector so
2504 * that we may copy them with a single copyin. This
2505 * allows us to deal with page faults up-front.
2506 */
2507 if (msfr.msfr_nsrcs > 0) {
2508 struct in_msource *lims;
2509 struct sockaddr_in *psin;
2510 struct sockaddr_storage *kss, *pkss;
2511 int i;
2512
2513 INP_WUNLOCK(inp);
2514
2515 CTR2(KTR_IGMPV3, "%s: loading %lu source list entries",
2516 __func__, (unsigned long)msfr.msfr_nsrcs);
2517 kss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
2518 M_TEMP, M_WAITOK);
2519 error = copyin(msfr.msfr_srcs, kss,
2520 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
2521 if (error) {
2522 free(kss, M_TEMP);
2523 return (error);
2524 }
2525
2526 INP_WLOCK(inp);
2527
2528 /*
2529 * Mark all source filters as UNDEFINED at t1.
2530 * Restore new group filter mode, as imf_leave()
2531 * will set it to INCLUDE.
2532 */
2533 imf_leave(imf);
2534 imf->imf_st[1] = msfr.msfr_fmode;
2535
2536 /*
2537 * Update socket layer filters at t1, lazy-allocating
2538 * new entries. This saves a bunch of memory at the
2539 * cost of one RB_FIND() per source entry; duplicate
2540 * entries in the msfr_nsrcs vector are ignored.
2541 * If we encounter an error, rollback transaction.
2542 *
2543 * XXX This too could be replaced with a set-symmetric
2544 * difference like loop to avoid walking from root
2545 * every time, as the key space is common.
2546 */
2547 for (i = 0, pkss = kss; i < msfr.msfr_nsrcs; i++, pkss++) {
2548 psin = (struct sockaddr_in *)pkss;
2549 if (psin->sin_family != AF_INET) {
2550 error = EAFNOSUPPORT;
2551 break;
2552 }
2553 if (psin->sin_len != sizeof(struct sockaddr_in)) {
2554 error = EINVAL;
2555 break;
2556 }
2557 error = imf_get_source(imf, psin, &lims);
2558 if (error)
2559 break;
2560 lims->imsl_st[1] = imf->imf_st[1];
2561 }
2562 free(kss, M_TEMP);
2563 }
2564
2565 if (error)
2566 goto out_imf_rollback;
2567
2568 INP_WLOCK_ASSERT(inp);
2569 IN_MULTI_LOCK();
2570
2571 /*
2572 * Begin state merge transaction at IGMP layer.
2573 */
2574 CTR1(KTR_IGMPV3, "%s: merge inm state", __func__);
2575 error = inm_merge(inm, imf);
2576 if (error) {
2577 CTR1(KTR_IGMPV3, "%s: failed to merge inm state", __func__);
2578 goto out_in_multi_locked;
2579 }
2580
2581 CTR1(KTR_IGMPV3, "%s: doing igmp downcall", __func__);
2582 error = igmp_change_state(inm);
2583 if (error)
2584 CTR1(KTR_IGMPV3, "%s: failed igmp downcall", __func__);
2585
2586 out_in_multi_locked:
2587
2588 IN_MULTI_UNLOCK();
2589
2590 out_imf_rollback:
2591 if (error)
2592 imf_rollback(imf);
2593 else
2594 imf_commit(imf);
2595
2596 imf_reap(imf);
2597
2598 out_inp_locked:
2599 INP_WUNLOCK(inp);
2600 return (error);
2601 }
2602
2603 /*
2604 * Set the IP multicast options in response to user setsockopt().
2605 *
2606 * Many of the socket options handled in this function duplicate the
2607 * functionality of socket options in the regular unicast API. However,
2608 * it is not possible to merge the duplicate code, because the idempotence
2609 * of the IPv4 multicast part of the BSD Sockets API must be preserved;
2610 * the effects of these options must be treated as separate and distinct.
2611 *
2612 * SMPng: XXX: Unlocked read of inp_socket believed OK.
2613 * FUTURE: The IP_MULTICAST_VIF option may be eliminated if MROUTING
2614 * is refactored to no longer use vifs.
2615 */
2616 int
2617 inp_setmoptions(struct inpcb *inp, struct sockopt *sopt)
2618 {
2619 struct ip_moptions *imo;
2620 int error;
2621
2622 error = 0;
2623
2624 /*
2625 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
2626 * or is a divert socket, reject it.
2627 */
2628 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
2629 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
2630 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM))
2631 return (EOPNOTSUPP);
2632
2633 switch (sopt->sopt_name) {
2634 case IP_MULTICAST_VIF: {
2635 int vifi;
2636 /*
2637 * Select a multicast VIF for transmission.
2638 * Only useful if multicast forwarding is active.
2639 */
2640 if (legal_vif_num == NULL) {
2641 error = EOPNOTSUPP;
2642 break;
2643 }
2644 error = sooptcopyin(sopt, &vifi, sizeof(int), sizeof(int));
2645 if (error)
2646 break;
2647 if (!legal_vif_num(vifi) && (vifi != -1)) {
2648 error = EINVAL;
2649 break;
2650 }
2651 imo = inp_findmoptions(inp);
2652 imo->imo_multicast_vif = vifi;
2653 INP_WUNLOCK(inp);
2654 break;
2655 }
2656
2657 case IP_MULTICAST_IF:
2658 error = inp_set_multicast_if(inp, sopt);
2659 break;
2660
2661 case IP_MULTICAST_TTL: {
2662 u_char ttl;
2663
2664 /*
2665 * Set the IP time-to-live for outgoing multicast packets.
2666 * The original multicast API required a char argument,
2667 * which is inconsistent with the rest of the socket API.
2668 * We allow either a char or an int.
2669 */
2670 if (sopt->sopt_valsize == sizeof(u_char)) {
2671 error = sooptcopyin(sopt, &ttl, sizeof(u_char),
2672 sizeof(u_char));
2673 if (error)
2674 break;
2675 } else {
2676 u_int ittl;
2677
2678 error = sooptcopyin(sopt, &ittl, sizeof(u_int),
2679 sizeof(u_int));
2680 if (error)
2681 break;
2682 if (ittl > 255) {
2683 error = EINVAL;
2684 break;
2685 }
2686 ttl = (u_char)ittl;
2687 }
2688 imo = inp_findmoptions(inp);
2689 imo->imo_multicast_ttl = ttl;
2690 INP_WUNLOCK(inp);
2691 break;
2692 }
2693
2694 case IP_MULTICAST_LOOP: {
2695 u_char loop;
2696
2697 /*
2698 * Set the loopback flag for outgoing multicast packets.
2699 * Must be zero or one. The original multicast API required a
2700 * char argument, which is inconsistent with the rest
2701 * of the socket API. We allow either a char or an int.
2702 */
2703 if (sopt->sopt_valsize == sizeof(u_char)) {
2704 error = sooptcopyin(sopt, &loop, sizeof(u_char),
2705 sizeof(u_char));
2706 if (error)
2707 break;
2708 } else {
2709 u_int iloop;
2710
2711 error = sooptcopyin(sopt, &iloop, sizeof(u_int),
2712 sizeof(u_int));
2713 if (error)
2714 break;
2715 loop = (u_char)iloop;
2716 }
2717 imo = inp_findmoptions(inp);
2718 imo->imo_multicast_loop = !!loop;
2719 INP_WUNLOCK(inp);
2720 break;
2721 }
2722
2723 case IP_ADD_MEMBERSHIP:
2724 case IP_ADD_SOURCE_MEMBERSHIP:
2725 case MCAST_JOIN_GROUP:
2726 case MCAST_JOIN_SOURCE_GROUP:
2727 error = inp_join_group(inp, sopt);
2728 break;
2729
2730 case IP_DROP_MEMBERSHIP:
2731 case IP_DROP_SOURCE_MEMBERSHIP:
2732 case MCAST_LEAVE_GROUP:
2733 case MCAST_LEAVE_SOURCE_GROUP:
2734 error = inp_leave_group(inp, sopt);
2735 break;
2736
2737 case IP_BLOCK_SOURCE:
2738 case IP_UNBLOCK_SOURCE:
2739 case MCAST_BLOCK_SOURCE:
2740 case MCAST_UNBLOCK_SOURCE:
2741 error = inp_block_unblock_source(inp, sopt);
2742 break;
2743
2744 case IP_MSFILTER:
2745 error = inp_set_source_filters(inp, sopt);
2746 break;
2747
2748 default:
2749 error = EOPNOTSUPP;
2750 break;
2751 }
2752
2753 INP_UNLOCK_ASSERT(inp);
2754
2755 return (error);
2756 }
2757
2758 /*
2759 * Expose IGMP's multicast filter mode and source list(s) to userland,
2760 * keyed by (ifindex, group).
2761 * The filter mode is written out as a uint32_t, followed by
2762 * 0..n of struct in_addr.
2763 * For use by ifmcstat(8).
2764 * SMPng: NOTE: unlocked read of ifindex space.
2765 */
2766 static int
2767 sysctl_ip_mcast_filters(SYSCTL_HANDLER_ARGS)
2768 {
2769 struct in_addr src, group;
2770 struct ifnet *ifp;
2771 struct ifmultiaddr *ifma;
2772 struct in_multi *inm;
2773 struct ip_msource *ims;
2774 int *name;
2775 int retval;
2776 u_int namelen;
2777 uint32_t fmode, ifindex;
2778
2779 name = (int *)arg1;
2780 namelen = arg2;
2781
2782 if (req->newptr != NULL)
2783 return (EPERM);
2784
2785 if (namelen != 2)
2786 return (EINVAL);
2787
2788 ifindex = name[0];
2789 if (ifindex <= 0 || ifindex > V_if_index) {
2790 CTR2(KTR_IGMPV3, "%s: ifindex %u out of range",
2791 __func__, ifindex);
2792 return (ENOENT);
2793 }
2794
2795 group.s_addr = name[1];
2796 if (!IN_MULTICAST(ntohl(group.s_addr))) {
2797 CTR2(KTR_IGMPV3, "%s: group %s is not multicast",
2798 __func__, inet_ntoa(group));
2799 return (EINVAL);
2800 }
2801
2802 ifp = ifnet_byindex(ifindex);
2803 if (ifp == NULL) {
2804 CTR2(KTR_IGMPV3, "%s: no ifp for ifindex %u",
2805 __func__, ifindex);
2806 return (ENOENT);
2807 }
2808
2809 retval = sysctl_wire_old_buffer(req,
2810 sizeof(uint32_t) + (in_mcast_maxgrpsrc * sizeof(struct in_addr)));
2811 if (retval)
2812 return (retval);
2813
2814 IN_MULTI_LOCK();
2815
2816 IF_ADDR_RLOCK(ifp);
2817 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2818 if (ifma->ifma_addr->sa_family != AF_INET ||
2819 ifma->ifma_protospec == NULL)
2820 continue;
2821 inm = (struct in_multi *)ifma->ifma_protospec;
2822 if (!in_hosteq(inm->inm_addr, group))
2823 continue;
2824 fmode = inm->inm_st[1].iss_fmode;
2825 retval = SYSCTL_OUT(req, &fmode, sizeof(uint32_t));
2826 if (retval != 0)
2827 break;
2828 RB_FOREACH(ims, ip_msource_tree, &inm->inm_srcs) {
2829 #ifdef KTR
2830 struct in_addr ina;
2831 ina.s_addr = htonl(ims->ims_haddr);
2832 CTR2(KTR_IGMPV3, "%s: visit node %s", __func__,
2833 inet_ntoa(ina));
2834 #endif
2835 /*
2836 * Only copy-out sources which are in-mode.
2837 */
2838 if (fmode != ims_get_mode(inm, ims, 1)) {
2839 CTR1(KTR_IGMPV3, "%s: skip non-in-mode",
2840 __func__);
2841 continue;
2842 }
2843 src.s_addr = htonl(ims->ims_haddr);
2844 retval = SYSCTL_OUT(req, &src, sizeof(struct in_addr));
2845 if (retval != 0)
2846 break;
2847 }
2848 }
2849 IF_ADDR_RUNLOCK(ifp);
2850
2851 IN_MULTI_UNLOCK();
2852
2853 return (retval);
2854 }
2855
2856 #ifdef KTR
2857
2858 static const char *inm_modestrs[] = { "un", "in", "ex" };
2859
2860 static const char *
2861 inm_mode_str(const int mode)
2862 {
2863
2864 if (mode >= MCAST_UNDEFINED && mode <= MCAST_EXCLUDE)
2865 return (inm_modestrs[mode]);
2866 return ("??");
2867 }
2868
2869 static const char *inm_statestrs[] = {
2870 "not-member",
2871 "silent",
2872 "idle",
2873 "lazy",
2874 "sleeping",
2875 "awakening",
2876 "query-pending",
2877 "sg-query-pending",
2878 "leaving"
2879 };
2880
2881 static const char *
2882 inm_state_str(const int state)
2883 {
2884
2885 if (state >= IGMP_NOT_MEMBER && state <= IGMP_LEAVING_MEMBER)
2886 return (inm_statestrs[state]);
2887 return ("??");
2888 }
2889
2890 /*
2891 * Dump an in_multi structure to the console.
2892 */
2893 void
2894 inm_print(const struct in_multi *inm)
2895 {
2896 int t;
2897
2898 if ((ktr_mask & KTR_IGMPV3) == 0)
2899 return;
2900
2901 printf("%s: --- begin inm %p ---\n", __func__, inm);
2902 printf("addr %s ifp %p(%s) ifma %p\n",
2903 inet_ntoa(inm->inm_addr),
2904 inm->inm_ifp,
2905 inm->inm_ifp->if_xname,
2906 inm->inm_ifma);
2907 printf("timer %u state %s refcount %u scq.len %u\n",
2908 inm->inm_timer,
2909 inm_state_str(inm->inm_state),
2910 inm->inm_refcount,
2911 inm->inm_scq.ifq_len);
2912 printf("igi %p nsrc %lu sctimer %u scrv %u\n",
2913 inm->inm_igi,
2914 inm->inm_nsrc,
2915 inm->inm_sctimer,
2916 inm->inm_scrv);
2917 for (t = 0; t < 2; t++) {
2918 printf("t%d: fmode %s asm %u ex %u in %u rec %u\n", t,
2919 inm_mode_str(inm->inm_st[t].iss_fmode),
2920 inm->inm_st[t].iss_asm,
2921 inm->inm_st[t].iss_ex,
2922 inm->inm_st[t].iss_in,
2923 inm->inm_st[t].iss_rec);
2924 }
2925 printf("%s: --- end inm %p ---\n", __func__, inm);
2926 }
2927
2928 #else /* !KTR */
2929
2930 void
2931 inm_print(const struct in_multi *inm)
2932 {
2933
2934 }
2935
2936 #endif /* KTR */
2937
2938 RB_GENERATE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
Cache object: 6056ee2b0f8dfc064204d33ae7ca2205
|