2 * Copyright (c) 2007 Bruce M. Simpson.
3 * Copyright (c) 2005 Robert N. M. Watson.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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
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
32 * IPv4 multicast socket, group, and socket option processing module.
33 * Until further notice, this file requires INET to compile.
34 * TODO: Make this infrastructure independent of address family.
35 * TODO: Teach netinet6 to use this code.
36 * TODO: Hook up SSM logic to IGMPv3/MLDv2.
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
47 #include <sys/protosw.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/sysctl.h>
51 #include <sys/vimage.h>
54 #include <net/if_dl.h>
55 #include <net/route.h>
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>
64 #ifndef __SOCKUNION_DECLARED
66 struct sockaddr_storage ss;
68 struct sockaddr_dl sdl;
69 struct sockaddr_in sin;
71 struct sockaddr_in6 sin6;
74 typedef union sockunion sockunion_t;
75 #define __SOCKUNION_DECLARED
76 #endif /* __SOCKUNION_DECLARED */
78 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "IPv4 multicast group");
79 static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "IPv4 multicast options");
80 static MALLOC_DEFINE(M_IPMSOURCE, "in_msource", "IPv4 multicast source filter");
83 * The IPv4 multicast list (in_multihead and associated structures) are
84 * protected by the global in_multi_mtx. See in_var.h for more details. For
85 * now, in_multi_mtx is marked as recursible due to IGMP's calling back into
86 * ip_output() to send IGMP packets while holding the lock; this probably is
87 * not quite desirable.
89 struct in_multihead in_multihead; /* XXX BSS initialization */
90 struct mtx in_multi_mtx;
91 MTX_SYSINIT(in_multi_mtx, &in_multi_mtx, "in_multi_mtx", MTX_DEF | MTX_RECURSE);
94 * Functions with non-static linkage defined in this file should be
95 * declared in in_var.h:
100 * in_delmulti_locked()
106 static int imo_grow(struct ip_moptions *);
107 static int imo_join_source(struct ip_moptions *, size_t, sockunion_t *);
108 static int imo_leave_source(struct ip_moptions *, size_t, sockunion_t *);
109 static int inp_change_source_filter(struct inpcb *, struct sockopt *);
110 static struct ip_moptions *
111 inp_findmoptions(struct inpcb *);
112 static int inp_get_source_filters(struct inpcb *, struct sockopt *);
113 static int inp_join_group(struct inpcb *, struct sockopt *);
114 static int inp_leave_group(struct inpcb *, struct sockopt *);
115 static int inp_set_multicast_if(struct inpcb *, struct sockopt *);
116 static int inp_set_source_filters(struct inpcb *, struct sockopt *);
119 * Resize the ip_moptions vector to the next power-of-two minus 1.
120 * May be called with locks held; do not sleep.
123 imo_grow(struct ip_moptions *imo)
125 struct in_multi **nmships;
126 struct in_multi **omships;
127 struct in_mfilter *nmfilters;
128 struct in_mfilter *omfilters;
135 omships = imo->imo_membership;
136 omfilters = imo->imo_mfilters;
137 oldmax = imo->imo_max_memberships;
138 newmax = ((oldmax + 1) * 2) - 1;
140 if (newmax <= IP_MAX_MEMBERSHIPS) {
141 nmships = (struct in_multi **)realloc(omships,
142 sizeof(struct in_multi *) * newmax, M_IPMOPTS, M_NOWAIT);
143 nmfilters = (struct in_mfilter *)realloc(omfilters,
144 sizeof(struct in_mfilter) * newmax, M_IPMSOURCE, M_NOWAIT);
145 if (nmships != NULL && nmfilters != NULL) {
146 /* Initialize newly allocated source filter heads. */
147 for (idx = oldmax; idx < newmax; idx++) {
148 nmfilters[idx].imf_fmode = MCAST_EXCLUDE;
149 nmfilters[idx].imf_nsources = 0;
150 TAILQ_INIT(&nmfilters[idx].imf_sources);
152 imo->imo_max_memberships = newmax;
153 imo->imo_membership = nmships;
154 imo->imo_mfilters = nmfilters;
158 if (nmships == NULL || nmfilters == NULL) {
160 free(nmships, M_IPMOPTS);
161 if (nmfilters != NULL)
162 free(nmfilters, M_IPMSOURCE);
163 return (ETOOMANYREFS);
170 * Add a source to a multicast filter list.
171 * Assumes the associated inpcb is locked.
174 imo_join_source(struct ip_moptions *imo, size_t gidx, sockunion_t *src)
176 struct in_msource *ims, *nims;
177 struct in_mfilter *imf;
179 KASSERT(src->ss.ss_family == AF_INET, ("%s: !AF_INET", __func__));
180 KASSERT(imo->imo_mfilters != NULL,
181 ("%s: imo_mfilters vector not allocated", __func__));
183 imf = &imo->imo_mfilters[gidx];
184 if (imf->imf_nsources == IP_MAX_SOURCE_FILTER)
187 ims = imo_match_source(imo, gidx, &src->sa);
189 return (EADDRNOTAVAIL);
191 /* Do not sleep with inp lock held. */
192 MALLOC(nims, struct in_msource *, sizeof(struct in_msource),
193 M_IPMSOURCE, M_NOWAIT | M_ZERO);
197 nims->ims_addr = src->ss;
198 TAILQ_INSERT_TAIL(&imf->imf_sources, nims, ims_next);
205 imo_leave_source(struct ip_moptions *imo, size_t gidx, sockunion_t *src)
207 struct in_msource *ims;
208 struct in_mfilter *imf;
210 KASSERT(src->ss.ss_family == AF_INET, ("%s: !AF_INET", __func__));
211 KASSERT(imo->imo_mfilters != NULL,
212 ("%s: imo_mfilters vector not allocated", __func__));
214 imf = &imo->imo_mfilters[gidx];
215 if (imf->imf_nsources == IP_MAX_SOURCE_FILTER)
218 ims = imo_match_source(imo, gidx, &src->sa);
220 return (EADDRNOTAVAIL);
222 TAILQ_REMOVE(&imf->imf_sources, ims, ims_next);
223 FREE(ims, M_IPMSOURCE);
230 * Find an IPv4 multicast group entry for this ip_moptions instance
231 * which matches the specified group, and optionally an interface.
232 * Return its index into the array, or -1 if not found.
235 imo_match_group(struct ip_moptions *imo, struct ifnet *ifp,
236 struct sockaddr *group)
239 struct in_multi **pinm;
243 gsa = (sockunion_t *)group;
245 /* The imo_membership array may be lazy allocated. */
246 if (imo->imo_membership == NULL || imo->imo_num_memberships == 0)
249 nmships = imo->imo_num_memberships;
250 pinm = &imo->imo_membership[0];
251 for (idx = 0; idx < nmships; idx++, pinm++) {
255 printf("%s: trying ifp = %p, inaddr = %s ", __func__,
256 ifp, inet_ntoa(gsa->sin.sin_addr));
257 printf("against %p, %s\n",
258 (*pinm)->inm_ifp, inet_ntoa((*pinm)->inm_addr));
260 if ((ifp == NULL || ((*pinm)->inm_ifp == ifp)) &&
261 (*pinm)->inm_addr.s_addr == gsa->sin.sin_addr.s_addr) {
272 * Find a multicast source entry for this imo which matches
273 * the given group index for this socket, and source address.
276 imo_match_source(struct ip_moptions *imo, size_t gidx, struct sockaddr *src)
278 struct in_mfilter *imf;
279 struct in_msource *ims, *pims;
281 KASSERT(src->sa_family == AF_INET, ("%s: !AF_INET", __func__));
282 KASSERT(gidx != -1 && gidx < imo->imo_num_memberships,
283 ("%s: invalid index %d\n", __func__, (int)gidx));
285 /* The imo_mfilters array may be lazy allocated. */
286 if (imo->imo_mfilters == NULL)
290 imf = &imo->imo_mfilters[gidx];
291 TAILQ_FOREACH(ims, &imf->imf_sources, ims_next) {
293 * Perform bitwise comparison of two IPv4 addresses.
294 * TODO: Do the same for IPv6.
295 * Do not use sa_equal() for this as it is not aware of
296 * deeper structure in sockaddr_in or sockaddr_in6.
298 if (((struct sockaddr_in *)&ims->ims_addr)->sin_addr.s_addr ==
299 ((struct sockaddr_in *)src)->sin_addr.s_addr) {
309 * Join an IPv4 multicast group.
312 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
314 INIT_VNET_INET(ifp->if_vnet);
315 struct in_multi *inm;
322 IN_LOOKUP_MULTI(*ap, ifp, inm);
325 * If we already joined this group, just bump the
326 * refcount and return it.
328 KASSERT(inm->inm_refcount >= 1,
329 ("%s: bad refcount %d", __func__, inm->inm_refcount));
333 struct ifmultiaddr *ifma;
334 struct in_multi *ninm;
337 memset(&gsa, 0, sizeof(gsa));
338 gsa.sin.sin_family = AF_INET;
339 gsa.sin.sin_len = sizeof(struct sockaddr_in);
340 gsa.sin.sin_addr = *ap;
343 * Check if a link-layer group is already associated
344 * with this network-layer group on the given ifnet.
345 * If so, bump the refcount on the existing network-layer
346 * group association and return it.
348 error = if_addmulti(ifp, &gsa.sa, &ifma);
351 if (ifma->ifma_protospec != NULL) {
352 inm = (struct in_multi *)ifma->ifma_protospec;
354 if (inm->inm_ifma != ifma || inm->inm_ifp != ifp ||
355 inm->inm_addr.s_addr != ap->s_addr)
356 panic("%s: ifma is inconsistent", __func__);
363 * A new membership is needed; construct it and
364 * perform the IGMP join.
366 ninm = malloc(sizeof(*ninm), M_IPMADDR, M_NOWAIT | M_ZERO);
368 if_delmulti_ifma(ifma);
371 ninm->inm_addr = *ap;
373 ninm->inm_ifma = ifma;
374 ninm->inm_refcount = 1;
375 ifma->ifma_protospec = ninm;
376 LIST_INSERT_HEAD(&V_in_multihead, ninm, inm_link);
378 igmp_joingroup(ninm);
384 IFF_UNLOCKGIANT(ifp);
390 * Leave an IPv4 multicast group.
391 * It is OK to call this routine if the underlying ifnet went away.
393 * XXX: To deal with the ifp going away, we cheat; the link-layer code in net
394 * will set ifma_ifp to NULL when the associated ifnet instance is detached
397 * The only reason we need to violate layers and check ifma_ifp here at all
398 * is because certain hardware drivers still require Giant to be held,
399 * and it must always be taken before other locks.
402 in_delmulti(struct in_multi *inm)
406 KASSERT(inm != NULL, ("%s: inm is NULL", __func__));
407 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__));
408 ifp = inm->inm_ifma->ifma_ifp;
412 * Sanity check that netinet's notion of ifp is the
415 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__));
420 in_delmulti_locked(inm);
424 IFF_UNLOCKGIANT(ifp);
428 * Delete a multicast address record, with locks held.
430 * It is OK to call this routine if the ifp went away.
431 * Assumes that caller holds the IN_MULTI lock, and that
432 * Giant was taken before other locks if required by the hardware.
435 in_delmulti_locked(struct in_multi *inm)
437 struct ifmultiaddr *ifma;
439 IN_MULTI_LOCK_ASSERT();
440 KASSERT(inm->inm_refcount >= 1, ("%s: freeing freed inm", __func__));
442 if (--inm->inm_refcount == 0) {
443 igmp_leavegroup(inm);
445 ifma = inm->inm_ifma;
448 printf("%s: purging ifma %p\n", __func__, ifma);
450 KASSERT(ifma->ifma_protospec == inm,
451 ("%s: ifma_protospec != inm", __func__));
452 ifma->ifma_protospec = NULL;
454 LIST_REMOVE(inm, inm_link);
455 free(inm, M_IPMADDR);
457 if_delmulti_ifma(ifma);
462 * Block or unblock an ASM/SSM multicast source on an inpcb.
465 inp_change_source_filter(struct inpcb *inp, struct sockopt *sopt)
467 INIT_VNET_NET(curvnet);
468 INIT_VNET_INET(curvnet);
469 struct group_source_req gsr;
470 sockunion_t *gsa, *ssa;
472 struct in_mfilter *imf;
473 struct ip_moptions *imo;
474 struct in_msource *ims;
483 memset(&gsr, 0, sizeof(struct group_source_req));
484 gsa = (sockunion_t *)&gsr.gsr_group;
485 ssa = (sockunion_t *)&gsr.gsr_source;
487 switch (sopt->sopt_name) {
488 case IP_BLOCK_SOURCE:
489 case IP_UNBLOCK_SOURCE: {
490 struct ip_mreq_source mreqs;
492 error = sooptcopyin(sopt, &mreqs,
493 sizeof(struct ip_mreq_source),
494 sizeof(struct ip_mreq_source));
498 gsa->sin.sin_family = AF_INET;
499 gsa->sin.sin_len = sizeof(struct sockaddr_in);
500 gsa->sin.sin_addr = mreqs.imr_multiaddr;
502 ssa->sin.sin_family = AF_INET;
503 ssa->sin.sin_len = sizeof(struct sockaddr_in);
504 ssa->sin.sin_addr = mreqs.imr_sourceaddr;
506 if (mreqs.imr_interface.s_addr != INADDR_ANY)
507 INADDR_TO_IFP(mreqs.imr_interface, ifp);
509 if (sopt->sopt_name == IP_BLOCK_SOURCE)
514 printf("%s: imr_interface = %s, ifp = %p\n",
515 __func__, inet_ntoa(mreqs.imr_interface), ifp);
521 case MCAST_BLOCK_SOURCE:
522 case MCAST_UNBLOCK_SOURCE:
523 error = sooptcopyin(sopt, &gsr,
524 sizeof(struct group_source_req),
525 sizeof(struct group_source_req));
529 if (gsa->sin.sin_family != AF_INET ||
530 gsa->sin.sin_len != sizeof(struct sockaddr_in))
533 if (ssa->sin.sin_family != AF_INET ||
534 ssa->sin.sin_len != sizeof(struct sockaddr_in))
537 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
538 return (EADDRNOTAVAIL);
540 ifp = ifnet_byindex(gsr.gsr_interface);
542 if (sopt->sopt_name == MCAST_BLOCK_SOURCE)
549 printf("%s: unknown sopt_name %d\n", __func__,
558 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
562 * Check if we are actually a member of this group.
564 imo = inp_findmoptions(inp);
565 idx = imo_match_group(imo, ifp, &gsa->sa);
566 if (idx == -1 || imo->imo_mfilters == NULL) {
567 error = EADDRNOTAVAIL;
571 KASSERT(imo->imo_mfilters != NULL,
572 ("%s: imo_mfilters not allocated", __func__));
573 imf = &imo->imo_mfilters[idx];
576 * SSM multicast truth table for block/unblock operations.
578 * Operation Filter Mode Entry exists? Action
580 * block exclude no add source to filter
581 * unblock include no add source to filter
582 * block include no EINVAL
583 * unblock exclude no EINVAL
584 * block exclude yes EADDRNOTAVAIL
585 * unblock include yes EADDRNOTAVAIL
586 * block include yes remove source from filter
587 * unblock exclude yes remove source from filter
589 * FreeBSD does not explicitly distinguish between ASM and SSM
590 * mode sockets; all sockets are assumed to have a filter list.
594 printf("%s: imf_fmode is %s\n", __func__,
595 imf->imf_fmode == MCAST_INCLUDE ? "include" : "exclude");
598 ims = imo_match_source(imo, idx, &ssa->sa);
600 if ((block == 1 && imf->imf_fmode == MCAST_EXCLUDE) ||
601 (block == 0 && imf->imf_fmode == MCAST_INCLUDE)) {
604 printf("%s: adding %s to filter list\n",
605 __func__, inet_ntoa(ssa->sin.sin_addr));
608 error = imo_join_source(imo, idx, ssa);
610 if ((block == 1 && imf->imf_fmode == MCAST_INCLUDE) ||
611 (block == 0 && imf->imf_fmode == MCAST_EXCLUDE)) {
613 * If the socket is in inclusive mode:
614 * the source is already blocked as it has no entry.
615 * If the socket is in exclusive mode:
616 * the source is already unblocked as it has no entry.
620 printf("%s: ims %p; %s already [un]blocked\n",
622 inet_ntoa(ssa->sin.sin_addr));
628 if ((block == 1 && imf->imf_fmode == MCAST_EXCLUDE) ||
629 (block == 0 && imf->imf_fmode == MCAST_INCLUDE)) {
631 * If the socket is in exclusive mode:
632 * the source is already blocked as it has an entry.
633 * If the socket is in inclusive mode:
634 * the source is already unblocked as it has an entry.
638 printf("%s: ims %p; %s already [un]blocked\n",
640 inet_ntoa(ssa->sin.sin_addr));
643 error = EADDRNOTAVAIL;
645 if ((block == 1 && imf->imf_fmode == MCAST_INCLUDE) ||
646 (block == 0 && imf->imf_fmode == MCAST_EXCLUDE)) {
649 printf("%s: removing %s from filter list\n",
650 __func__, inet_ntoa(ssa->sin.sin_addr));
653 error = imo_leave_source(imo, idx, ssa);
663 * Given an inpcb, return its multicast options structure pointer. Accepts
664 * an unlocked inpcb pointer, but will return it locked. May sleep.
666 static struct ip_moptions *
667 inp_findmoptions(struct inpcb *inp)
669 struct ip_moptions *imo;
670 struct in_multi **immp;
671 struct in_mfilter *imfp;
675 if (inp->inp_moptions != NULL)
676 return (inp->inp_moptions);
680 imo = (struct ip_moptions *)malloc(sizeof(*imo), M_IPMOPTS,
682 immp = (struct in_multi **)malloc(sizeof(*immp) * IP_MIN_MEMBERSHIPS,
683 M_IPMOPTS, M_WAITOK | M_ZERO);
684 imfp = (struct in_mfilter *)malloc(
685 sizeof(struct in_mfilter) * IP_MIN_MEMBERSHIPS,
686 M_IPMSOURCE, M_WAITOK);
688 imo->imo_multicast_ifp = NULL;
689 imo->imo_multicast_addr.s_addr = INADDR_ANY;
690 imo->imo_multicast_vif = -1;
691 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
692 imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
693 imo->imo_num_memberships = 0;
694 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS;
695 imo->imo_membership = immp;
697 /* Initialize per-group source filters. */
698 for (idx = 0; idx < IP_MIN_MEMBERSHIPS; idx++) {
699 imfp[idx].imf_fmode = MCAST_EXCLUDE;
700 imfp[idx].imf_nsources = 0;
701 TAILQ_INIT(&imfp[idx].imf_sources);
703 imo->imo_mfilters = imfp;
706 if (inp->inp_moptions != NULL) {
707 free(imfp, M_IPMSOURCE);
708 free(immp, M_IPMOPTS);
709 free(imo, M_IPMOPTS);
710 return (inp->inp_moptions);
712 inp->inp_moptions = imo;
717 * Discard the IP multicast options (and source filters).
720 inp_freemoptions(struct ip_moptions *imo)
722 struct in_mfilter *imf;
723 struct in_msource *ims, *tims;
726 KASSERT(imo != NULL, ("%s: ip_moptions is NULL", __func__));
728 nmships = imo->imo_num_memberships;
729 for (idx = 0; idx < nmships; ++idx) {
730 in_delmulti(imo->imo_membership[idx]);
732 if (imo->imo_mfilters != NULL) {
733 imf = &imo->imo_mfilters[idx];
734 TAILQ_FOREACH_SAFE(ims, &imf->imf_sources,
736 TAILQ_REMOVE(&imf->imf_sources, ims, ims_next);
737 FREE(ims, M_IPMSOURCE);
740 KASSERT(imf->imf_nsources == 0,
741 ("%s: did not free all imf_nsources", __func__));
745 if (imo->imo_mfilters != NULL)
746 free(imo->imo_mfilters, M_IPMSOURCE);
747 free(imo->imo_membership, M_IPMOPTS);
748 free(imo, M_IPMOPTS);
752 * Atomically get source filters on a socket for an IPv4 multicast group.
753 * Called with INP lock held; returns with lock released.
756 inp_get_source_filters(struct inpcb *inp, struct sockopt *sopt)
758 INIT_VNET_NET(curvnet);
759 struct __msfilterreq msfr;
762 struct ip_moptions *imo;
763 struct in_mfilter *imf;
764 struct in_msource *ims;
765 struct sockaddr_storage *ptss;
766 struct sockaddr_storage *tss;
770 INP_WLOCK_ASSERT(inp);
772 imo = inp->inp_moptions;
773 KASSERT(imo != NULL, ("%s: null ip_moptions", __func__));
777 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
778 sizeof(struct __msfilterreq));
782 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
785 ifp = ifnet_byindex(msfr.msfr_ifindex);
792 * Lookup group on the socket.
794 gsa = (sockunion_t *)&msfr.msfr_group;
795 idx = imo_match_group(imo, ifp, &gsa->sa);
796 if (idx == -1 || imo->imo_mfilters == NULL) {
798 return (EADDRNOTAVAIL);
801 imf = &imo->imo_mfilters[idx];
802 msfr.msfr_fmode = imf->imf_fmode;
803 msfr.msfr_nsrcs = imf->imf_nsources;
806 * If the user specified a buffer, copy out the source filter
807 * entries to userland gracefully.
808 * msfr.msfr_nsrcs is always set to the total number of filter
809 * entries which the kernel currently has for this group.
812 if (msfr.msfr_srcs != NULL && msfr.msfr_nsrcs > 0) {
814 * Make a copy of the source vector so that we do not
815 * thrash the inpcb lock whilst copying it out.
816 * We only copy out the number of entries which userland
817 * has asked for, but we always tell userland how big the
818 * buffer really needs to be.
820 MALLOC(tss, struct sockaddr_storage *,
821 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
827 TAILQ_FOREACH(ims, &imf->imf_sources, ims_next) {
828 memcpy(ptss++, &ims->ims_addr,
829 sizeof(struct sockaddr_storage));
837 error = copyout(tss, msfr.msfr_srcs,
838 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
845 error = sooptcopyout(sopt, &msfr, sizeof(struct __msfilterreq));
851 * Return the IP multicast options in response to user getsockopt().
854 inp_getmoptions(struct inpcb *inp, struct sockopt *sopt)
856 INIT_VNET_INET(curvnet);
857 struct ip_mreqn mreqn;
858 struct ip_moptions *imo;
860 struct in_ifaddr *ia;
865 imo = inp->inp_moptions;
867 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
868 * or is a divert socket, reject it.
870 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
871 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
872 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM)) {
878 switch (sopt->sopt_name) {
879 case IP_MULTICAST_VIF:
881 optval = imo->imo_multicast_vif;
885 error = sooptcopyout(sopt, &optval, sizeof(int));
888 case IP_MULTICAST_IF:
889 memset(&mreqn, 0, sizeof(struct ip_mreqn));
891 ifp = imo->imo_multicast_ifp;
892 if (imo->imo_multicast_addr.s_addr != INADDR_ANY) {
893 mreqn.imr_address = imo->imo_multicast_addr;
894 } else if (ifp != NULL) {
895 mreqn.imr_ifindex = ifp->if_index;
899 IA_SIN(ia)->sin_addr;
904 if (sopt->sopt_valsize == sizeof(struct ip_mreqn)) {
905 error = sooptcopyout(sopt, &mreqn,
906 sizeof(struct ip_mreqn));
908 error = sooptcopyout(sopt, &mreqn.imr_address,
909 sizeof(struct in_addr));
913 case IP_MULTICAST_TTL:
915 optval = coptval = IP_DEFAULT_MULTICAST_TTL;
917 optval = coptval = imo->imo_multicast_ttl;
919 if (sopt->sopt_valsize == sizeof(u_char))
920 error = sooptcopyout(sopt, &coptval, sizeof(u_char));
922 error = sooptcopyout(sopt, &optval, sizeof(int));
925 case IP_MULTICAST_LOOP:
927 optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
929 optval = coptval = imo->imo_multicast_loop;
931 if (sopt->sopt_valsize == sizeof(u_char))
932 error = sooptcopyout(sopt, &coptval, sizeof(u_char));
934 error = sooptcopyout(sopt, &optval, sizeof(int));
939 error = EADDRNOTAVAIL;
942 error = inp_get_source_filters(inp, sopt);
952 INP_UNLOCK_ASSERT(inp);
958 * Join an IPv4 multicast group, possibly with a source.
961 inp_join_group(struct inpcb *inp, struct sockopt *sopt)
963 INIT_VNET_NET(curvnet);
964 INIT_VNET_INET(curvnet);
965 struct group_source_req gsr;
966 sockunion_t *gsa, *ssa;
968 struct in_mfilter *imf;
969 struct ip_moptions *imo;
970 struct in_multi *inm;
977 memset(&gsr, 0, sizeof(struct group_source_req));
978 gsa = (sockunion_t *)&gsr.gsr_group;
979 gsa->ss.ss_family = AF_UNSPEC;
980 ssa = (sockunion_t *)&gsr.gsr_source;
981 ssa->ss.ss_family = AF_UNSPEC;
983 switch (sopt->sopt_name) {
984 case IP_ADD_MEMBERSHIP:
985 case IP_ADD_SOURCE_MEMBERSHIP: {
986 struct ip_mreq_source mreqs;
988 if (sopt->sopt_name == IP_ADD_MEMBERSHIP) {
989 error = sooptcopyin(sopt, &mreqs,
990 sizeof(struct ip_mreq),
991 sizeof(struct ip_mreq));
993 * Do argument switcharoo from ip_mreq into
994 * ip_mreq_source to avoid using two instances.
996 mreqs.imr_interface = mreqs.imr_sourceaddr;
997 mreqs.imr_sourceaddr.s_addr = INADDR_ANY;
998 } else if (sopt->sopt_name == IP_ADD_SOURCE_MEMBERSHIP) {
999 error = sooptcopyin(sopt, &mreqs,
1000 sizeof(struct ip_mreq_source),
1001 sizeof(struct ip_mreq_source));
1006 gsa->sin.sin_family = AF_INET;
1007 gsa->sin.sin_len = sizeof(struct sockaddr_in);
1008 gsa->sin.sin_addr = mreqs.imr_multiaddr;
1010 if (sopt->sopt_name == IP_ADD_SOURCE_MEMBERSHIP) {
1011 ssa->sin.sin_family = AF_INET;
1012 ssa->sin.sin_len = sizeof(struct sockaddr_in);
1013 ssa->sin.sin_addr = mreqs.imr_sourceaddr;
1017 * Obtain ifp. If no interface address was provided,
1018 * use the interface of the route in the unicast FIB for
1019 * the given multicast destination; usually, this is the
1021 * If this lookup fails, attempt to use the first non-loopback
1022 * interface with multicast capability in the system as a
1023 * last resort. The legacy IPv4 ASM API requires that we do
1024 * this in order to allow groups to be joined when the routing
1025 * table has not yet been populated during boot.
1026 * If all of these conditions fail, return EADDRNOTAVAIL, and
1027 * reject the IPv4 multicast join.
1029 if (mreqs.imr_interface.s_addr != INADDR_ANY) {
1030 INADDR_TO_IFP(mreqs.imr_interface, ifp);
1035 *(struct sockaddr_in *)&ro.ro_dst = gsa->sin;
1036 in_rtalloc_ign(&ro, RTF_CLONING,
1037 inp->inp_inc.inc_fibnum);
1038 if (ro.ro_rt != NULL) {
1039 ifp = ro.ro_rt->rt_ifp;
1040 KASSERT(ifp != NULL, ("%s: null ifp",
1044 struct in_ifaddr *ia;
1045 struct ifnet *mfp = NULL;
1046 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1048 if (!(mfp->if_flags & IFF_LOOPBACK) &&
1049 (mfp->if_flags & IFF_MULTICAST)) {
1058 printf("%s: imr_interface = %s, ifp = %p\n",
1059 __func__, inet_ntoa(mreqs.imr_interface), ifp);
1065 case MCAST_JOIN_GROUP:
1066 case MCAST_JOIN_SOURCE_GROUP:
1067 if (sopt->sopt_name == MCAST_JOIN_GROUP) {
1068 error = sooptcopyin(sopt, &gsr,
1069 sizeof(struct group_req),
1070 sizeof(struct group_req));
1071 } else if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1072 error = sooptcopyin(sopt, &gsr,
1073 sizeof(struct group_source_req),
1074 sizeof(struct group_source_req));
1079 if (gsa->sin.sin_family != AF_INET ||
1080 gsa->sin.sin_len != sizeof(struct sockaddr_in))
1084 * Overwrite the port field if present, as the sockaddr
1085 * being copied in may be matched with a binary comparison.
1088 gsa->sin.sin_port = 0;
1089 if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
1090 if (ssa->sin.sin_family != AF_INET ||
1091 ssa->sin.sin_len != sizeof(struct sockaddr_in))
1093 ssa->sin.sin_port = 0;
1099 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1100 return (EADDRNOTAVAIL);
1101 ifp = ifnet_byindex(gsr.gsr_interface);
1108 printf("%s: unknown sopt_name %d\n", __func__,
1112 return (EOPNOTSUPP);
1116 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
1119 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0)
1120 return (EADDRNOTAVAIL);
1123 * Check if we already hold membership of this group for this inpcb.
1124 * If so, we do not need to perform the initial join.
1126 imo = inp_findmoptions(inp);
1127 idx = imo_match_group(imo, ifp, &gsa->sa);
1129 if (ssa->ss.ss_family != AF_UNSPEC) {
1131 * Attempting to join an ASM group (when already
1132 * an ASM or SSM member) is an error.
1134 error = EADDRNOTAVAIL;
1136 imf = &imo->imo_mfilters[idx];
1137 if (imf->imf_nsources == 0) {
1139 * Attempting to join an SSM group (when
1140 * already an ASM member) is an error.
1145 * Attempting to join an SSM group (when
1146 * already an SSM member) means "add this
1147 * source to the inclusive filter list".
1149 error = imo_join_source(imo, idx, ssa);
1156 * Call imo_grow() to reallocate the membership and source filter
1157 * vectors if they are full. If the size would exceed the hard limit,
1158 * then we know we've really run out of entries. We keep the INP
1159 * lock held to avoid introducing a race condition.
1161 if (imo->imo_num_memberships == imo->imo_max_memberships) {
1162 error = imo_grow(imo);
1168 * So far, so good: perform the layer 3 join, layer 2 join,
1169 * and make an IGMP announcement if needed.
1171 inm = in_addmulti(&gsa->sin.sin_addr, ifp);
1176 idx = imo->imo_num_memberships;
1177 imo->imo_membership[idx] = inm;
1178 imo->imo_num_memberships++;
1180 KASSERT(imo->imo_mfilters != NULL,
1181 ("%s: imf_mfilters vector was not allocated", __func__));
1182 imf = &imo->imo_mfilters[idx];
1183 KASSERT(TAILQ_EMPTY(&imf->imf_sources),
1184 ("%s: imf_sources not empty", __func__));
1187 * If this is a new SSM group join (i.e. a source was specified
1188 * with this group), add this source to the filter list.
1190 if (ssa->ss.ss_family != AF_UNSPEC) {
1192 * An initial SSM join implies that this socket's membership
1193 * of the multicast group is now in inclusive mode.
1195 imf->imf_fmode = MCAST_INCLUDE;
1197 error = imo_join_source(imo, idx, ssa);
1200 * Drop inp lock before calling in_delmulti(),
1201 * to prevent a lock order reversal.
1203 --imo->imo_num_memberships;
1216 * Leave an IPv4 multicast group on an inpcb, possibly with a source.
1219 inp_leave_group(struct inpcb *inp, struct sockopt *sopt)
1221 INIT_VNET_NET(curvnet);
1222 INIT_VNET_INET(curvnet);
1223 struct group_source_req gsr;
1224 struct ip_mreq_source mreqs;
1225 sockunion_t *gsa, *ssa;
1227 struct in_mfilter *imf;
1228 struct ip_moptions *imo;
1229 struct in_msource *ims, *tims;
1230 struct in_multi *inm;
1237 memset(&gsr, 0, sizeof(struct group_source_req));
1238 gsa = (sockunion_t *)&gsr.gsr_group;
1239 gsa->ss.ss_family = AF_UNSPEC;
1240 ssa = (sockunion_t *)&gsr.gsr_source;
1241 ssa->ss.ss_family = AF_UNSPEC;
1243 switch (sopt->sopt_name) {
1244 case IP_DROP_MEMBERSHIP:
1245 case IP_DROP_SOURCE_MEMBERSHIP:
1246 if (sopt->sopt_name == IP_DROP_MEMBERSHIP) {
1247 error = sooptcopyin(sopt, &mreqs,
1248 sizeof(struct ip_mreq),
1249 sizeof(struct ip_mreq));
1251 * Swap interface and sourceaddr arguments,
1252 * as ip_mreq and ip_mreq_source are laid
1255 mreqs.imr_interface = mreqs.imr_sourceaddr;
1256 mreqs.imr_sourceaddr.s_addr = INADDR_ANY;
1257 } else if (sopt->sopt_name == IP_DROP_SOURCE_MEMBERSHIP) {
1258 error = sooptcopyin(sopt, &mreqs,
1259 sizeof(struct ip_mreq_source),
1260 sizeof(struct ip_mreq_source));
1265 gsa->sin.sin_family = AF_INET;
1266 gsa->sin.sin_len = sizeof(struct sockaddr_in);
1267 gsa->sin.sin_addr = mreqs.imr_multiaddr;
1269 if (sopt->sopt_name == IP_DROP_SOURCE_MEMBERSHIP) {
1270 ssa->sin.sin_family = AF_INET;
1271 ssa->sin.sin_len = sizeof(struct sockaddr_in);
1272 ssa->sin.sin_addr = mreqs.imr_sourceaddr;
1275 if (gsa->sin.sin_addr.s_addr != INADDR_ANY)
1276 INADDR_TO_IFP(mreqs.imr_interface, ifp);
1280 printf("%s: imr_interface = %s, ifp = %p\n",
1281 __func__, inet_ntoa(mreqs.imr_interface), ifp);
1286 case MCAST_LEAVE_GROUP:
1287 case MCAST_LEAVE_SOURCE_GROUP:
1288 if (sopt->sopt_name == MCAST_LEAVE_GROUP) {
1289 error = sooptcopyin(sopt, &gsr,
1290 sizeof(struct group_req),
1291 sizeof(struct group_req));
1292 } else if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
1293 error = sooptcopyin(sopt, &gsr,
1294 sizeof(struct group_source_req),
1295 sizeof(struct group_source_req));
1300 if (gsa->sin.sin_family != AF_INET ||
1301 gsa->sin.sin_len != sizeof(struct sockaddr_in))
1304 if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
1305 if (ssa->sin.sin_family != AF_INET ||
1306 ssa->sin.sin_len != sizeof(struct sockaddr_in))
1310 if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
1311 return (EADDRNOTAVAIL);
1313 ifp = ifnet_byindex(gsr.gsr_interface);
1319 printf("%s: unknown sopt_name %d\n", __func__,
1323 return (EOPNOTSUPP);
1327 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
1331 * Find the membership in the membership array.
1333 imo = inp_findmoptions(inp);
1334 idx = imo_match_group(imo, ifp, &gsa->sa);
1336 error = EADDRNOTAVAIL;
1339 imf = &imo->imo_mfilters[idx];
1342 * If we were instructed only to leave a given source, do so.
1344 if (ssa->ss.ss_family != AF_UNSPEC) {
1345 if (imf->imf_nsources == 0 ||
1346 imf->imf_fmode == MCAST_EXCLUDE) {
1348 * Attempting to SSM leave an ASM group
1349 * is an error; should use *_BLOCK_SOURCE instead.
1350 * Attempting to SSM leave a source in a group when
1351 * the socket is in 'exclude mode' is also an error.
1355 error = imo_leave_source(imo, idx, ssa);
1358 * If an error occurred, or this source is not the last
1359 * source in the group, do not leave the whole group.
1361 if (error || imf->imf_nsources > 0)
1366 * Give up the multicast address record to which the membership points.
1368 inm = imo->imo_membership[idx];
1372 * Free any source filters for this group if they exist.
1373 * Revert inpcb to the default MCAST_EXCLUDE state.
1375 if (imo->imo_mfilters != NULL) {
1376 TAILQ_FOREACH_SAFE(ims, &imf->imf_sources, ims_next, tims) {
1377 TAILQ_REMOVE(&imf->imf_sources, ims, ims_next);
1378 FREE(ims, M_IPMSOURCE);
1379 imf->imf_nsources--;
1381 KASSERT(imf->imf_nsources == 0,
1382 ("%s: imf_nsources not 0", __func__));
1383 KASSERT(TAILQ_EMPTY(&imf->imf_sources),
1384 ("%s: imf_sources not empty", __func__));
1385 imf->imf_fmode = MCAST_EXCLUDE;
1389 * Remove the gap in the membership array.
1391 for (++idx; idx < imo->imo_num_memberships; ++idx)
1392 imo->imo_membership[idx-1] = imo->imo_membership[idx];
1393 imo->imo_num_memberships--;
1401 * Select the interface for transmitting IPv4 multicast datagrams.
1403 * Either an instance of struct in_addr or an instance of struct ip_mreqn
1404 * may be passed to this socket option. An address of INADDR_ANY or an
1405 * interface index of 0 is used to remove a previous selection.
1406 * When no interface is selected, one is chosen for every send.
1409 inp_set_multicast_if(struct inpcb *inp, struct sockopt *sopt)
1411 INIT_VNET_NET(curvnet);
1412 struct in_addr addr;
1413 struct ip_mreqn mreqn;
1415 struct ip_moptions *imo;
1418 if (sopt->sopt_valsize == sizeof(struct ip_mreqn)) {
1420 * An interface index was specified using the
1421 * Linux-derived ip_mreqn structure.
1423 error = sooptcopyin(sopt, &mreqn, sizeof(struct ip_mreqn),
1424 sizeof(struct ip_mreqn));
1428 if (mreqn.imr_ifindex < 0 || V_if_index < mreqn.imr_ifindex)
1431 if (mreqn.imr_ifindex == 0) {
1434 ifp = ifnet_byindex(mreqn.imr_ifindex);
1436 return (EADDRNOTAVAIL);
1440 * An interface was specified by IPv4 address.
1441 * This is the traditional BSD usage.
1443 error = sooptcopyin(sopt, &addr, sizeof(struct in_addr),
1444 sizeof(struct in_addr));
1447 if (addr.s_addr == INADDR_ANY) {
1450 INADDR_TO_IFP(addr, ifp);
1452 return (EADDRNOTAVAIL);
1456 printf("%s: ifp = %p, addr = %s\n",
1457 __func__, ifp, inet_ntoa(addr)); /* XXX INET6 */
1462 /* Reject interfaces which do not support multicast. */
1463 if (ifp != NULL && (ifp->if_flags & IFF_MULTICAST) == 0)
1464 return (EOPNOTSUPP);
1466 imo = inp_findmoptions(inp);
1467 imo->imo_multicast_ifp = ifp;
1468 imo->imo_multicast_addr.s_addr = INADDR_ANY;
1475 * Atomically set source filters on a socket for an IPv4 multicast group.
1478 inp_set_source_filters(struct inpcb *inp, struct sockopt *sopt)
1480 INIT_VNET_NET(curvnet);
1481 struct __msfilterreq msfr;
1484 struct in_mfilter *imf;
1485 struct ip_moptions *imo;
1486 struct in_msource *ims, *tims;
1490 error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
1491 sizeof(struct __msfilterreq));
1495 if (msfr.msfr_nsrcs > IP_MAX_SOURCE_FILTER ||
1496 (msfr.msfr_fmode != MCAST_EXCLUDE &&
1497 msfr.msfr_fmode != MCAST_INCLUDE))
1500 if (msfr.msfr_group.ss_family != AF_INET ||
1501 msfr.msfr_group.ss_len != sizeof(struct sockaddr_in))
1504 gsa = (sockunion_t *)&msfr.msfr_group;
1505 if (!IN_MULTICAST(ntohl(gsa->sin.sin_addr.s_addr)))
1508 gsa->sin.sin_port = 0; /* ignore port */
1510 if (msfr.msfr_ifindex == 0 || V_if_index < msfr.msfr_ifindex)
1511 return (EADDRNOTAVAIL);
1513 ifp = ifnet_byindex(msfr.msfr_ifindex);
1515 return (EADDRNOTAVAIL);
1518 * Take the INP lock.
1519 * Check if this socket is a member of this group.
1521 imo = inp_findmoptions(inp);
1522 idx = imo_match_group(imo, ifp, &gsa->sa);
1523 if (idx == -1 || imo->imo_mfilters == NULL) {
1524 error = EADDRNOTAVAIL;
1527 imf = &imo->imo_mfilters[idx];
1531 printf("%s: clearing source list\n", __func__);
1535 * Remove any existing source filters.
1537 TAILQ_FOREACH_SAFE(ims, &imf->imf_sources, ims_next, tims) {
1538 TAILQ_REMOVE(&imf->imf_sources, ims, ims_next);
1539 FREE(ims, M_IPMSOURCE);
1540 imf->imf_nsources--;
1542 KASSERT(imf->imf_nsources == 0,
1543 ("%s: source list not cleared", __func__));
1546 * Apply any new source filters, if present.
1548 if (msfr.msfr_nsrcs > 0) {
1549 struct in_msource **pnims;
1550 struct in_msource *nims;
1551 struct sockaddr_storage *kss;
1552 struct sockaddr_storage *pkss;
1557 * Drop the inp lock so we may sleep if we need to
1558 * in order to satisfy a malloc request.
1559 * We will re-take it before changing socket state.
1564 printf("%s: loading %lu source list entries\n",
1565 __func__, (unsigned long)msfr.msfr_nsrcs);
1569 * Make a copy of the user-space source vector so
1570 * that we may copy them with a single copyin. This
1571 * allows us to deal with page faults up-front.
1573 MALLOC(kss, struct sockaddr_storage *,
1574 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
1576 error = copyin(msfr.msfr_srcs, kss,
1577 sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
1584 * Perform argument checking on every sockaddr_storage
1585 * structure in the vector provided to us. Overwrite
1586 * fields which should not apply to source entries.
1587 * TODO: Check for duplicate sources on this pass.
1589 psu = (sockunion_t *)kss;
1590 for (i = 0; i < msfr.msfr_nsrcs; i++, psu++) {
1591 switch (psu->ss.ss_family) {
1593 if (psu->sin.sin_len !=
1594 sizeof(struct sockaddr_in)) {
1597 psu->sin.sin_port = 0;
1602 if (psu->sin6.sin6_len !=
1603 sizeof(struct sockaddr_in6)) {
1606 psu->sin6.sin6_port = 0;
1607 psu->sin6.sin6_flowinfo = 0;
1612 error = EAFNOSUPPORT;
1624 * Allocate a block to track all the in_msource
1625 * entries we are about to allocate, in case we
1626 * abruptly need to free them.
1628 MALLOC(pnims, struct in_msource **,
1629 sizeof(struct in_msource *) * msfr.msfr_nsrcs,
1630 M_TEMP, M_WAITOK | M_ZERO);
1633 * Allocate up to nsrcs individual chunks.
1634 * If we encounter an error, backtrack out of
1635 * all allocations cleanly; updates must be atomic.
1639 for (i = 0; i < msfr.msfr_nsrcs; i++, pkss++) {
1640 MALLOC(nims, struct in_msource *,
1641 sizeof(struct in_msource) * msfr.msfr_nsrcs,
1642 M_IPMSOURCE, M_WAITOK | M_ZERO);
1645 if (i < msfr.msfr_nsrcs) {
1646 for (j = 0; j < i; j++) {
1647 if (pnims[j] != NULL)
1648 FREE(pnims[j], M_IPMSOURCE);
1650 FREE(pnims, M_TEMP);
1655 INP_UNLOCK_ASSERT(inp);
1658 * Finally, apply the filters to the socket.
1659 * Re-take the inp lock; we are changing socket state.
1663 for (i = 0; i < msfr.msfr_nsrcs; i++, pkss++) {
1664 memcpy(&(pnims[i]->ims_addr), pkss,
1665 sizeof(struct sockaddr_storage));
1666 TAILQ_INSERT_TAIL(&imf->imf_sources, pnims[i],
1668 imf->imf_nsources++;
1670 FREE(pnims, M_TEMP);
1675 * Update the filter mode on the socket before releasing the inpcb.
1677 INP_WLOCK_ASSERT(inp);
1678 imf->imf_fmode = msfr.msfr_fmode;
1686 * Set the IP multicast options in response to user setsockopt().
1688 * Many of the socket options handled in this function duplicate the
1689 * functionality of socket options in the regular unicast API. However,
1690 * it is not possible to merge the duplicate code, because the idempotence
1691 * of the IPv4 multicast part of the BSD Sockets API must be preserved;
1692 * the effects of these options must be treated as separate and distinct.
1695 inp_setmoptions(struct inpcb *inp, struct sockopt *sopt)
1697 struct ip_moptions *imo;
1703 * If socket is neither of type SOCK_RAW or SOCK_DGRAM,
1704 * or is a divert socket, reject it.
1705 * XXX Unlocked read of inp_socket believed OK.
1707 if (inp->inp_socket->so_proto->pr_protocol == IPPROTO_DIVERT ||
1708 (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
1709 inp->inp_socket->so_proto->pr_type != SOCK_DGRAM))
1710 return (EOPNOTSUPP);
1712 switch (sopt->sopt_name) {
1713 case IP_MULTICAST_VIF: {
1716 * Select a multicast VIF for transmission.
1717 * Only useful if multicast forwarding is active.
1719 if (legal_vif_num == NULL) {
1723 error = sooptcopyin(sopt, &vifi, sizeof(int), sizeof(int));
1726 if (!legal_vif_num(vifi) && (vifi != -1)) {
1730 imo = inp_findmoptions(inp);
1731 imo->imo_multicast_vif = vifi;
1736 case IP_MULTICAST_IF:
1737 error = inp_set_multicast_if(inp, sopt);
1740 case IP_MULTICAST_TTL: {
1744 * Set the IP time-to-live for outgoing multicast packets.
1745 * The original multicast API required a char argument,
1746 * which is inconsistent with the rest of the socket API.
1747 * We allow either a char or an int.
1749 if (sopt->sopt_valsize == sizeof(u_char)) {
1750 error = sooptcopyin(sopt, &ttl, sizeof(u_char),
1757 error = sooptcopyin(sopt, &ittl, sizeof(u_int),
1767 imo = inp_findmoptions(inp);
1768 imo->imo_multicast_ttl = ttl;
1773 case IP_MULTICAST_LOOP: {
1777 * Set the loopback flag for outgoing multicast packets.
1778 * Must be zero or one. The original multicast API required a
1779 * char argument, which is inconsistent with the rest
1780 * of the socket API. We allow either a char or an int.
1782 if (sopt->sopt_valsize == sizeof(u_char)) {
1783 error = sooptcopyin(sopt, &loop, sizeof(u_char),
1790 error = sooptcopyin(sopt, &iloop, sizeof(u_int),
1794 loop = (u_char)iloop;
1796 imo = inp_findmoptions(inp);
1797 imo->imo_multicast_loop = !!loop;
1802 case IP_ADD_MEMBERSHIP:
1803 case IP_ADD_SOURCE_MEMBERSHIP:
1804 case MCAST_JOIN_GROUP:
1805 case MCAST_JOIN_SOURCE_GROUP:
1806 error = inp_join_group(inp, sopt);
1809 case IP_DROP_MEMBERSHIP:
1810 case IP_DROP_SOURCE_MEMBERSHIP:
1811 case MCAST_LEAVE_GROUP:
1812 case MCAST_LEAVE_SOURCE_GROUP:
1813 error = inp_leave_group(inp, sopt);
1816 case IP_BLOCK_SOURCE:
1817 case IP_UNBLOCK_SOURCE:
1818 case MCAST_BLOCK_SOURCE:
1819 case MCAST_UNBLOCK_SOURCE:
1820 error = inp_change_source_filter(inp, sopt);
1824 error = inp_set_source_filters(inp, sopt);
1832 INP_UNLOCK_ASSERT(inp);