The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_mcast.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2009 Bruce Simpson.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote
   16  *    products derived from this software without specific prior written
   17  *    permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 /*
   33  * IPv6 multicast socket, group, and socket option processing module.
   34  * Normative references: RFC 2292, RFC 3492, RFC 3542, RFC 3678, RFC 3810.
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 #include "opt_inet6.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/kernel.h>
   45 #include <sys/ktr.h>
   46 #include <sys/malloc.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/protosw.h>
   49 #include <sys/socket.h>
   50 #include <sys/socketvar.h>
   51 #include <sys/sysctl.h>
   52 #include <sys/priv.h>
   53 #include <sys/taskqueue.h>
   54 #include <sys/tree.h>
   55 
   56 #include <net/if.h>
   57 #include <net/if_var.h>
   58 #include <net/if_dl.h>
   59 #include <net/route.h>
   60 #include <net/route/nhop.h>
   61 #include <net/vnet.h>
   62 
   63 #include <netinet/in.h>
   64 #include <netinet/udp.h>
   65 #include <netinet/in_var.h>
   66 #include <netinet/ip_var.h>
   67 #include <netinet/udp_var.h>
   68 #include <netinet6/in6_fib.h>
   69 #include <netinet6/in6_var.h>
   70 #include <netinet/ip6.h>
   71 #include <netinet/icmp6.h>
   72 #include <netinet6/ip6_var.h>
   73 #include <netinet/in_pcb.h>
   74 #include <netinet/tcp_var.h>
   75 #include <netinet6/nd6.h>
   76 #include <netinet6/mld6_var.h>
   77 #include <netinet6/scope6_var.h>
   78 
   79 #ifndef KTR_MLD
   80 #define KTR_MLD KTR_INET6
   81 #endif
   82 
   83 #ifndef __SOCKUNION_DECLARED
   84 union sockunion {
   85         struct sockaddr_storage ss;
   86         struct sockaddr         sa;
   87         struct sockaddr_dl      sdl;
   88         struct sockaddr_in6     sin6;
   89 };
   90 typedef union sockunion sockunion_t;
   91 #define __SOCKUNION_DECLARED
   92 #endif /* __SOCKUNION_DECLARED */
   93 
   94 static MALLOC_DEFINE(M_IN6MFILTER, "in6_mfilter",
   95     "IPv6 multicast PCB-layer source filter");
   96 MALLOC_DEFINE(M_IP6MADDR, "in6_multi", "IPv6 multicast group");
   97 static MALLOC_DEFINE(M_IP6MOPTS, "ip6_moptions", "IPv6 multicast options");
   98 static MALLOC_DEFINE(M_IP6MSOURCE, "ip6_msource",
   99     "IPv6 multicast MLD-layer source filter");
  100 
  101 RB_GENERATE(ip6_msource_tree, ip6_msource, im6s_link, ip6_msource_cmp);
  102 
  103 /*
  104  * Locking:
  105  * - Lock order is: Giant, IN6_MULTI_LOCK, INP_WLOCK,
  106  *   IN6_MULTI_LIST_LOCK, MLD_LOCK, IF_ADDR_LOCK.
  107  * - The IF_ADDR_LOCK is implicitly taken by in6m_lookup() earlier, however
  108  *   it can be taken by code in net/if.c also.
  109  * - ip6_moptions and in6_mfilter are covered by the INP_WLOCK.
  110  *
  111  * struct in6_multi is covered by IN6_MULTI_LOCK. There isn't strictly
  112  * any need for in6_multi itself to be virtualized -- it is bound to an ifp
  113  * anyway no matter what happens.
  114  */
  115 struct mtx in6_multi_list_mtx;
  116 MTX_SYSINIT(in6_multi_mtx, &in6_multi_list_mtx, "in6_multi_list_mtx", MTX_DEF);
  117 
  118 struct mtx in6_multi_free_mtx;
  119 MTX_SYSINIT(in6_multi_free_mtx, &in6_multi_free_mtx, "in6_multi_free_mtx", MTX_DEF);
  120 
  121 struct sx in6_multi_sx;
  122 SX_SYSINIT(in6_multi_sx, &in6_multi_sx, "in6_multi_sx");
  123 
  124 static void     im6f_commit(struct in6_mfilter *);
  125 static int      im6f_get_source(struct in6_mfilter *imf,
  126                     const struct sockaddr_in6 *psin,
  127                     struct in6_msource **);
  128 static struct in6_msource *
  129                 im6f_graft(struct in6_mfilter *, const uint8_t,
  130                     const struct sockaddr_in6 *);
  131 static void     im6f_leave(struct in6_mfilter *);
  132 static int      im6f_prune(struct in6_mfilter *, const struct sockaddr_in6 *);
  133 static void     im6f_purge(struct in6_mfilter *);
  134 static void     im6f_rollback(struct in6_mfilter *);
  135 static void     im6f_reap(struct in6_mfilter *);
  136 static struct in6_mfilter *
  137                 im6o_match_group(const struct ip6_moptions *,
  138                     const struct ifnet *, const struct sockaddr *);
  139 static struct in6_msource *
  140                 im6o_match_source(struct in6_mfilter *, const struct sockaddr *);
  141 static void     im6s_merge(struct ip6_msource *ims,
  142                     const struct in6_msource *lims, const int rollback);
  143 static int      in6_getmulti(struct ifnet *, const struct in6_addr *,
  144                     struct in6_multi **);
  145 static int      in6_joingroup_locked(struct ifnet *, const struct in6_addr *,
  146                     struct in6_mfilter *, struct in6_multi **, int);
  147 static int      in6m_get_source(struct in6_multi *inm,
  148                     const struct in6_addr *addr, const int noalloc,
  149                     struct ip6_msource **pims);
  150 #ifdef KTR
  151 static int      in6m_is_ifp_detached(const struct in6_multi *);
  152 #endif
  153 static int      in6m_merge(struct in6_multi *, /*const*/ struct in6_mfilter *);
  154 static void     in6m_purge(struct in6_multi *);
  155 static void     in6m_reap(struct in6_multi *);
  156 static struct ip6_moptions *
  157                 in6p_findmoptions(struct inpcb *);
  158 static int      in6p_get_source_filters(struct inpcb *, struct sockopt *);
  159 static int      in6p_join_group(struct inpcb *, struct sockopt *);
  160 static int      in6p_leave_group(struct inpcb *, struct sockopt *);
  161 static struct ifnet *
  162                 in6p_lookup_mcast_ifp(const struct inpcb *,
  163                     const struct sockaddr_in6 *);
  164 static int      in6p_block_unblock_source(struct inpcb *, struct sockopt *);
  165 static int      in6p_set_multicast_if(struct inpcb *, struct sockopt *);
  166 static int      in6p_set_source_filters(struct inpcb *, struct sockopt *);
  167 static int      sysctl_ip6_mcast_filters(SYSCTL_HANDLER_ARGS);
  168 
  169 SYSCTL_DECL(_net_inet6_ip6);    /* XXX Not in any common header. */
  170 
  171 static SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, mcast,
  172     CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
  173     "IPv6 multicast");
  174 
  175 static u_long in6_mcast_maxgrpsrc = IPV6_MAX_GROUP_SRC_FILTER;
  176 SYSCTL_ULONG(_net_inet6_ip6_mcast, OID_AUTO, maxgrpsrc,
  177     CTLFLAG_RWTUN, &in6_mcast_maxgrpsrc, 0,
  178     "Max source filters per group");
  179 
  180 static u_long in6_mcast_maxsocksrc = IPV6_MAX_SOCK_SRC_FILTER;
  181 SYSCTL_ULONG(_net_inet6_ip6_mcast, OID_AUTO, maxsocksrc,
  182     CTLFLAG_RWTUN, &in6_mcast_maxsocksrc, 0,
  183     "Max source filters per socket");
  184 
  185 /* TODO Virtualize this switch. */
  186 int in6_mcast_loop = IPV6_DEFAULT_MULTICAST_LOOP;
  187 SYSCTL_INT(_net_inet6_ip6_mcast, OID_AUTO, loop, CTLFLAG_RWTUN,
  188     &in6_mcast_loop, 0, "Loopback multicast datagrams by default");
  189 
  190 static SYSCTL_NODE(_net_inet6_ip6_mcast, OID_AUTO, filters,
  191     CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ip6_mcast_filters,
  192     "Per-interface stack-wide source filters");
  193 
  194 #ifdef KTR
  195 /*
  196  * Inline function which wraps assertions for a valid ifp.
  197  * The ifnet layer will set the ifma's ifp pointer to NULL if the ifp
  198  * is detached.
  199  */
  200 static int __inline
  201 in6m_is_ifp_detached(const struct in6_multi *inm)
  202 {
  203         struct ifnet *ifp;
  204 
  205         KASSERT(inm->in6m_ifma != NULL, ("%s: no ifma", __func__));
  206         ifp = inm->in6m_ifma->ifma_ifp;
  207         if (ifp != NULL) {
  208                 /*
  209                  * Sanity check that network-layer notion of ifp is the
  210                  * same as that of link-layer.
  211                  */
  212                 KASSERT(inm->in6m_ifp == ifp, ("%s: bad ifp", __func__));
  213         }
  214 
  215         return (ifp == NULL);
  216 }
  217 #endif
  218 
  219 /*
  220  * Initialize an in6_mfilter structure to a known state at t0, t1
  221  * with an empty source filter list.
  222  */
  223 static __inline void
  224 im6f_init(struct in6_mfilter *imf, const int st0, const int st1)
  225 {
  226         memset(imf, 0, sizeof(struct in6_mfilter));
  227         RB_INIT(&imf->im6f_sources);
  228         imf->im6f_st[0] = st0;
  229         imf->im6f_st[1] = st1;
  230 }
  231 
  232 struct in6_mfilter *
  233 ip6_mfilter_alloc(const int mflags, const int st0, const int st1)
  234 {
  235         struct in6_mfilter *imf;
  236 
  237         imf = malloc(sizeof(*imf), M_IN6MFILTER, mflags);
  238 
  239         if (imf != NULL)
  240                 im6f_init(imf, st0, st1);
  241 
  242         return (imf);
  243 }
  244 
  245 void
  246 ip6_mfilter_free(struct in6_mfilter *imf)
  247 {
  248 
  249         im6f_purge(imf);
  250         free(imf, M_IN6MFILTER);
  251 }
  252 
  253 /*
  254  * Find an IPv6 multicast group entry for this ip6_moptions instance
  255  * which matches the specified group, and optionally an interface.
  256  * Return its index into the array, or -1 if not found.
  257  */
  258 static struct in6_mfilter *
  259 im6o_match_group(const struct ip6_moptions *imo, const struct ifnet *ifp,
  260     const struct sockaddr *group)
  261 {
  262         const struct sockaddr_in6 *gsin6;
  263         struct in6_mfilter *imf;
  264         struct in6_multi *inm;
  265 
  266         gsin6 = (const struct sockaddr_in6 *)group;
  267 
  268         IP6_MFILTER_FOREACH(imf, &imo->im6o_head) {
  269                 inm = imf->im6f_in6m;
  270                 if (inm == NULL)
  271                         continue;
  272                 if ((ifp == NULL || (inm->in6m_ifp == ifp)) &&
  273                     IN6_ARE_ADDR_EQUAL(&inm->in6m_addr,
  274                     &gsin6->sin6_addr)) {
  275                         break;
  276                 }
  277         }
  278         return (imf);
  279 }
  280 
  281 /*
  282  * Find an IPv6 multicast source entry for this imo which matches
  283  * the given group index for this socket, and source address.
  284  *
  285  * XXX TODO: The scope ID, if present in src, is stripped before
  286  * any comparison. We SHOULD enforce scope/zone checks where the source
  287  * filter entry has a link scope.
  288  *
  289  * NOTE: This does not check if the entry is in-mode, merely if
  290  * it exists, which may not be the desired behaviour.
  291  */
  292 static struct in6_msource *
  293 im6o_match_source(struct in6_mfilter *imf, const struct sockaddr *src)
  294 {
  295         struct ip6_msource       find;
  296         struct ip6_msource      *ims;
  297         const sockunion_t       *psa;
  298 
  299         KASSERT(src->sa_family == AF_INET6, ("%s: !AF_INET6", __func__));
  300 
  301         psa = (const sockunion_t *)src;
  302         find.im6s_addr = psa->sin6.sin6_addr;
  303         in6_clearscope(&find.im6s_addr);                /* XXX */
  304         ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
  305 
  306         return ((struct in6_msource *)ims);
  307 }
  308 
  309 /*
  310  * Perform filtering for multicast datagrams on a socket by group and source.
  311  *
  312  * Returns 0 if a datagram should be allowed through, or various error codes
  313  * if the socket was not a member of the group, or the source was muted, etc.
  314  */
  315 int
  316 im6o_mc_filter(const struct ip6_moptions *imo, const struct ifnet *ifp,
  317     const struct sockaddr *group, const struct sockaddr *src)
  318 {
  319         struct in6_mfilter *imf;
  320         struct in6_msource *ims;
  321         int mode;
  322 
  323         KASSERT(ifp != NULL, ("%s: null ifp", __func__));
  324 
  325         imf = im6o_match_group(imo, ifp, group);
  326         if (imf == NULL)
  327                 return (MCAST_NOTGMEMBER);
  328 
  329         /*
  330          * Check if the source was included in an (S,G) join.
  331          * Allow reception on exclusive memberships by default,
  332          * reject reception on inclusive memberships by default.
  333          * Exclude source only if an in-mode exclude filter exists.
  334          * Include source only if an in-mode include filter exists.
  335          * NOTE: We are comparing group state here at MLD t1 (now)
  336          * with socket-layer t0 (since last downcall).
  337          */
  338         mode = imf->im6f_st[1];
  339         ims = im6o_match_source(imf, src);
  340 
  341         if ((ims == NULL && mode == MCAST_INCLUDE) ||
  342             (ims != NULL && ims->im6sl_st[0] != mode))
  343                 return (MCAST_NOTSMEMBER);
  344 
  345         return (MCAST_PASS);
  346 }
  347 
  348 /*
  349  * Find and return a reference to an in6_multi record for (ifp, group),
  350  * and bump its reference count.
  351  * If one does not exist, try to allocate it, and update link-layer multicast
  352  * filters on ifp to listen for group.
  353  * Assumes the IN6_MULTI lock is held across the call.
  354  * Return 0 if successful, otherwise return an appropriate error code.
  355  */
  356 static int
  357 in6_getmulti(struct ifnet *ifp, const struct in6_addr *group,
  358     struct in6_multi **pinm)
  359 {
  360         struct epoch_tracker     et;
  361         struct sockaddr_in6      gsin6;
  362         struct ifmultiaddr      *ifma;
  363         struct in6_multi        *inm;
  364         int                      error;
  365 
  366         error = 0;
  367 
  368         /*
  369          * XXX: Accesses to ifma_protospec must be covered by IF_ADDR_LOCK;
  370          * if_addmulti() takes this mutex itself, so we must drop and
  371          * re-acquire around the call.
  372          */
  373         IN6_MULTI_LOCK_ASSERT();
  374         IN6_MULTI_LIST_LOCK();
  375         IF_ADDR_WLOCK(ifp);
  376         NET_EPOCH_ENTER(et);
  377         /*
  378          * Does ifp support IPv6 multicasts?
  379          */
  380         if (ifp->if_afdata[AF_INET6] == NULL)
  381                 error = ENODEV;
  382         else
  383                 inm = in6m_lookup_locked(ifp, group);
  384         NET_EPOCH_EXIT(et);
  385 
  386         if (error != 0)
  387                 goto out_locked;
  388 
  389         if (inm != NULL) {
  390                 /*
  391                  * If we already joined this group, just bump the
  392                  * refcount and return it.
  393                  */
  394                 KASSERT(inm->in6m_refcount >= 1,
  395                     ("%s: bad refcount %d", __func__, inm->in6m_refcount));
  396                 in6m_acquire_locked(inm);
  397                 *pinm = inm;
  398                 goto out_locked;
  399         }
  400 
  401         memset(&gsin6, 0, sizeof(gsin6));
  402         gsin6.sin6_family = AF_INET6;
  403         gsin6.sin6_len = sizeof(struct sockaddr_in6);
  404         gsin6.sin6_addr = *group;
  405 
  406         /*
  407          * Check if a link-layer group is already associated
  408          * with this network-layer group on the given ifnet.
  409          */
  410         IN6_MULTI_LIST_UNLOCK();
  411         IF_ADDR_WUNLOCK(ifp);
  412         error = if_addmulti(ifp, (struct sockaddr *)&gsin6, &ifma);
  413         if (error != 0)
  414                 return (error);
  415         IN6_MULTI_LIST_LOCK();
  416         IF_ADDR_WLOCK(ifp);
  417 
  418         /*
  419          * If something other than netinet6 is occupying the link-layer
  420          * group, print a meaningful error message and back out of
  421          * the allocation.
  422          * Otherwise, bump the refcount on the existing network-layer
  423          * group association and return it.
  424          */
  425         if (ifma->ifma_protospec != NULL) {
  426                 inm = (struct in6_multi *)ifma->ifma_protospec;
  427 #ifdef INVARIANTS
  428                 KASSERT(ifma->ifma_addr != NULL, ("%s: no ifma_addr",
  429                     __func__));
  430                 KASSERT(ifma->ifma_addr->sa_family == AF_INET6,
  431                     ("%s: ifma not AF_INET6", __func__));
  432                 KASSERT(inm != NULL, ("%s: no ifma_protospec", __func__));
  433                 if (inm->in6m_ifma != ifma || inm->in6m_ifp != ifp ||
  434                     !IN6_ARE_ADDR_EQUAL(&inm->in6m_addr, group))
  435                         panic("%s: ifma %p is inconsistent with %p (%p)",
  436                             __func__, ifma, inm, group);
  437 #endif
  438                 in6m_acquire_locked(inm);
  439                 *pinm = inm;
  440                 goto out_locked;
  441         }
  442 
  443         IF_ADDR_WLOCK_ASSERT(ifp);
  444 
  445         /*
  446          * A new in6_multi record is needed; allocate and initialize it.
  447          * We DO NOT perform an MLD join as the in6_ layer may need to
  448          * push an initial source list down to MLD to support SSM.
  449          *
  450          * The initial source filter state is INCLUDE, {} as per the RFC.
  451          * Pending state-changes per group are subject to a bounds check.
  452          */
  453         inm = malloc(sizeof(*inm), M_IP6MADDR, M_NOWAIT | M_ZERO);
  454         if (inm == NULL) {
  455                 IN6_MULTI_LIST_UNLOCK();
  456                 IF_ADDR_WUNLOCK(ifp);
  457                 if_delmulti_ifma(ifma);
  458                 return (ENOMEM);
  459         }
  460         inm->in6m_addr = *group;
  461         inm->in6m_ifp = ifp;
  462         inm->in6m_mli = MLD_IFINFO(ifp);
  463         inm->in6m_ifma = ifma;
  464         inm->in6m_refcount = 1;
  465         inm->in6m_state = MLD_NOT_MEMBER;
  466         mbufq_init(&inm->in6m_scq, MLD_MAX_STATE_CHANGES);
  467 
  468         inm->in6m_st[0].iss_fmode = MCAST_UNDEFINED;
  469         inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
  470         RB_INIT(&inm->in6m_srcs);
  471 
  472         ifma->ifma_protospec = inm;
  473         *pinm = inm;
  474 
  475  out_locked:
  476         IN6_MULTI_LIST_UNLOCK();
  477         IF_ADDR_WUNLOCK(ifp);
  478         return (error);
  479 }
  480 
  481 /*
  482  * Drop a reference to an in6_multi record.
  483  *
  484  * If the refcount drops to 0, free the in6_multi record and
  485  * delete the underlying link-layer membership.
  486  */
  487 static void
  488 in6m_release(struct in6_multi *inm)
  489 {
  490         struct ifmultiaddr *ifma;
  491         struct ifnet *ifp;
  492 
  493         CTR2(KTR_MLD, "%s: refcount is %d", __func__, inm->in6m_refcount);
  494 
  495         MPASS(inm->in6m_refcount == 0);
  496         CTR2(KTR_MLD, "%s: freeing inm %p", __func__, inm);
  497 
  498         ifma = inm->in6m_ifma;
  499         ifp = inm->in6m_ifp;
  500         MPASS(ifma->ifma_llifma == NULL);
  501 
  502         /* XXX this access is not covered by IF_ADDR_LOCK */
  503         CTR2(KTR_MLD, "%s: purging ifma %p", __func__, ifma);
  504         KASSERT(ifma->ifma_protospec == NULL,
  505             ("%s: ifma_protospec != NULL", __func__));
  506         if (ifp == NULL)
  507                 ifp = ifma->ifma_ifp;
  508 
  509         if (ifp != NULL) {
  510                 CURVNET_SET(ifp->if_vnet);
  511                 in6m_purge(inm);
  512                 free(inm, M_IP6MADDR);
  513                 if_delmulti_ifma_flags(ifma, 1);
  514                 CURVNET_RESTORE();
  515                 if_rele(ifp);
  516         } else {
  517                 in6m_purge(inm);
  518                 free(inm, M_IP6MADDR);
  519                 if_delmulti_ifma_flags(ifma, 1);
  520         }
  521 }
  522 
  523 /*
  524  * Interface detach can happen in a taskqueue thread context, so we must use a
  525  * dedicated thread to avoid deadlocks when draining in6m_release tasks.
  526  */
  527 TASKQUEUE_DEFINE_THREAD(in6m_free);
  528 static struct in6_multi_head in6m_free_list = SLIST_HEAD_INITIALIZER();
  529 static void in6m_release_task(void *arg __unused, int pending __unused);
  530 static struct task in6m_free_task = TASK_INITIALIZER(0, in6m_release_task, NULL);
  531 
  532 void
  533 in6m_release_list_deferred(struct in6_multi_head *inmh)
  534 {
  535         if (SLIST_EMPTY(inmh))
  536                 return;
  537         mtx_lock(&in6_multi_free_mtx);
  538         SLIST_CONCAT(&in6m_free_list, inmh, in6_multi, in6m_nrele);
  539         mtx_unlock(&in6_multi_free_mtx);
  540         taskqueue_enqueue(taskqueue_in6m_free, &in6m_free_task);
  541 }
  542 
  543 void
  544 in6m_release_wait(void *arg __unused)
  545 {
  546 
  547         /*
  548          * Make sure all pending multicast addresses are freed before
  549          * the VNET or network device is destroyed:
  550          */
  551         taskqueue_drain_all(taskqueue_in6m_free);
  552 }
  553 #ifdef VIMAGE
  554 /* XXX-BZ FIXME, see D24914. */
  555 VNET_SYSUNINIT(in6m_release_wait, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, in6m_release_wait, NULL);
  556 #endif
  557 
  558 void
  559 in6m_disconnect_locked(struct in6_multi_head *inmh, struct in6_multi *inm)
  560 {
  561         struct ifnet *ifp;
  562         struct ifaddr *ifa;
  563         struct in6_ifaddr *ifa6;
  564         struct in6_multi_mship *imm, *imm_tmp;
  565         struct ifmultiaddr *ifma, *ll_ifma;
  566 
  567         IN6_MULTI_LIST_LOCK_ASSERT();
  568 
  569         ifp = inm->in6m_ifp;
  570         if (ifp == NULL)
  571                 return;         /* already called */
  572 
  573         inm->in6m_ifp = NULL;
  574         IF_ADDR_WLOCK_ASSERT(ifp);
  575         ifma = inm->in6m_ifma;
  576         if (ifma == NULL)
  577                 return;
  578 
  579         if_ref(ifp);
  580         if (ifma->ifma_flags & IFMA_F_ENQUEUED) {
  581                 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link);
  582                 ifma->ifma_flags &= ~IFMA_F_ENQUEUED;
  583         }
  584         MCDPRINTF("removed ifma: %p from %s\n", ifma, ifp->if_xname);
  585         if ((ll_ifma = ifma->ifma_llifma) != NULL) {
  586                 MPASS(ifma != ll_ifma);
  587                 ifma->ifma_llifma = NULL;
  588                 MPASS(ll_ifma->ifma_llifma == NULL);
  589                 MPASS(ll_ifma->ifma_ifp == ifp);
  590                 if (--ll_ifma->ifma_refcount == 0) {
  591                         if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) {
  592                                 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, ifma_link);
  593                                 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED;
  594                         }
  595                         MCDPRINTF("removed ll_ifma: %p from %s\n", ll_ifma, ifp->if_xname);
  596                         if_freemulti(ll_ifma);
  597                 }
  598         }
  599         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  600                 if (ifa->ifa_addr->sa_family != AF_INET6)
  601                         continue;
  602                 ifa6 = (void *)ifa;
  603                 LIST_FOREACH_SAFE(imm, &ifa6->ia6_memberships,
  604                     i6mm_chain, imm_tmp) {
  605                         if (inm == imm->i6mm_maddr) {
  606                                 LIST_REMOVE(imm, i6mm_chain);
  607                                 free(imm, M_IP6MADDR);
  608                                 in6m_rele_locked(inmh, inm);
  609                         }
  610                 }
  611         }
  612 }
  613 
  614 static void
  615 in6m_release_task(void *arg __unused, int pending __unused)
  616 {
  617         struct in6_multi_head in6m_free_tmp;
  618         struct in6_multi *inm, *tinm;
  619 
  620         SLIST_INIT(&in6m_free_tmp);
  621         mtx_lock(&in6_multi_free_mtx);
  622         SLIST_CONCAT(&in6m_free_tmp, &in6m_free_list, in6_multi, in6m_nrele);
  623         mtx_unlock(&in6_multi_free_mtx);
  624         IN6_MULTI_LOCK();
  625         SLIST_FOREACH_SAFE(inm, &in6m_free_tmp, in6m_nrele, tinm) {
  626                 SLIST_REMOVE_HEAD(&in6m_free_tmp, in6m_nrele);
  627                 in6m_release(inm);
  628         }
  629         IN6_MULTI_UNLOCK();
  630 }
  631 
  632 /*
  633  * Clear recorded source entries for a group.
  634  * Used by the MLD code. Caller must hold the IN6_MULTI lock.
  635  * FIXME: Should reap.
  636  */
  637 void
  638 in6m_clear_recorded(struct in6_multi *inm)
  639 {
  640         struct ip6_msource      *ims;
  641 
  642         IN6_MULTI_LIST_LOCK_ASSERT();
  643 
  644         RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
  645                 if (ims->im6s_stp) {
  646                         ims->im6s_stp = 0;
  647                         --inm->in6m_st[1].iss_rec;
  648                 }
  649         }
  650         KASSERT(inm->in6m_st[1].iss_rec == 0,
  651             ("%s: iss_rec %d not 0", __func__, inm->in6m_st[1].iss_rec));
  652 }
  653 
  654 /*
  655  * Record a source as pending for a Source-Group MLDv2 query.
  656  * This lives here as it modifies the shared tree.
  657  *
  658  * inm is the group descriptor.
  659  * naddr is the address of the source to record in network-byte order.
  660  *
  661  * If the net.inet6.mld.sgalloc sysctl is non-zero, we will
  662  * lazy-allocate a source node in response to an SG query.
  663  * Otherwise, no allocation is performed. This saves some memory
  664  * with the trade-off that the source will not be reported to the
  665  * router if joined in the window between the query response and
  666  * the group actually being joined on the local host.
  667  *
  668  * VIMAGE: XXX: Currently the mld_sgalloc feature has been removed.
  669  * This turns off the allocation of a recorded source entry if
  670  * the group has not been joined.
  671  *
  672  * Return 0 if the source didn't exist or was already marked as recorded.
  673  * Return 1 if the source was marked as recorded by this function.
  674  * Return <0 if any error occurred (negated errno code).
  675  */
  676 int
  677 in6m_record_source(struct in6_multi *inm, const struct in6_addr *addr)
  678 {
  679         struct ip6_msource       find;
  680         struct ip6_msource      *ims, *nims;
  681 
  682         IN6_MULTI_LIST_LOCK_ASSERT();
  683 
  684         find.im6s_addr = *addr;
  685         ims = RB_FIND(ip6_msource_tree, &inm->in6m_srcs, &find);
  686         if (ims && ims->im6s_stp)
  687                 return (0);
  688         if (ims == NULL) {
  689                 if (inm->in6m_nsrc == in6_mcast_maxgrpsrc)
  690                         return (-ENOSPC);
  691                 nims = malloc(sizeof(struct ip6_msource), M_IP6MSOURCE,
  692                     M_NOWAIT | M_ZERO);
  693                 if (nims == NULL)
  694                         return (-ENOMEM);
  695                 nims->im6s_addr = find.im6s_addr;
  696                 RB_INSERT(ip6_msource_tree, &inm->in6m_srcs, nims);
  697                 ++inm->in6m_nsrc;
  698                 ims = nims;
  699         }
  700 
  701         /*
  702          * Mark the source as recorded and update the recorded
  703          * source count.
  704          */
  705         ++ims->im6s_stp;
  706         ++inm->in6m_st[1].iss_rec;
  707 
  708         return (1);
  709 }
  710 
  711 /*
  712  * Return a pointer to an in6_msource owned by an in6_mfilter,
  713  * given its source address.
  714  * Lazy-allocate if needed. If this is a new entry its filter state is
  715  * undefined at t0.
  716  *
  717  * imf is the filter set being modified.
  718  * addr is the source address.
  719  *
  720  * SMPng: May be called with locks held; malloc must not block.
  721  */
  722 static int
  723 im6f_get_source(struct in6_mfilter *imf, const struct sockaddr_in6 *psin,
  724     struct in6_msource **plims)
  725 {
  726         struct ip6_msource       find;
  727         struct ip6_msource      *ims, *nims;
  728         struct in6_msource      *lims;
  729         int                      error;
  730 
  731         error = 0;
  732         ims = NULL;
  733         lims = NULL;
  734 
  735         find.im6s_addr = psin->sin6_addr;
  736         ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
  737         lims = (struct in6_msource *)ims;
  738         if (lims == NULL) {
  739                 if (imf->im6f_nsrc == in6_mcast_maxsocksrc)
  740                         return (ENOSPC);
  741                 nims = malloc(sizeof(struct in6_msource), M_IN6MFILTER,
  742                     M_NOWAIT | M_ZERO);
  743                 if (nims == NULL)
  744                         return (ENOMEM);
  745                 lims = (struct in6_msource *)nims;
  746                 lims->im6s_addr = find.im6s_addr;
  747                 lims->im6sl_st[0] = MCAST_UNDEFINED;
  748                 RB_INSERT(ip6_msource_tree, &imf->im6f_sources, nims);
  749                 ++imf->im6f_nsrc;
  750         }
  751 
  752         *plims = lims;
  753 
  754         return (error);
  755 }
  756 
  757 /*
  758  * Graft a source entry into an existing socket-layer filter set,
  759  * maintaining any required invariants and checking allocations.
  760  *
  761  * The source is marked as being in the new filter mode at t1.
  762  *
  763  * Return the pointer to the new node, otherwise return NULL.
  764  */
  765 static struct in6_msource *
  766 im6f_graft(struct in6_mfilter *imf, const uint8_t st1,
  767     const struct sockaddr_in6 *psin)
  768 {
  769         struct ip6_msource      *nims;
  770         struct in6_msource      *lims;
  771 
  772         nims = malloc(sizeof(struct in6_msource), M_IN6MFILTER,
  773             M_NOWAIT | M_ZERO);
  774         if (nims == NULL)
  775                 return (NULL);
  776         lims = (struct in6_msource *)nims;
  777         lims->im6s_addr = psin->sin6_addr;
  778         lims->im6sl_st[0] = MCAST_UNDEFINED;
  779         lims->im6sl_st[1] = st1;
  780         RB_INSERT(ip6_msource_tree, &imf->im6f_sources, nims);
  781         ++imf->im6f_nsrc;
  782 
  783         return (lims);
  784 }
  785 
  786 /*
  787  * Prune a source entry from an existing socket-layer filter set,
  788  * maintaining any required invariants and checking allocations.
  789  *
  790  * The source is marked as being left at t1, it is not freed.
  791  *
  792  * Return 0 if no error occurred, otherwise return an errno value.
  793  */
  794 static int
  795 im6f_prune(struct in6_mfilter *imf, const struct sockaddr_in6 *psin)
  796 {
  797         struct ip6_msource       find;
  798         struct ip6_msource      *ims;
  799         struct in6_msource      *lims;
  800 
  801         find.im6s_addr = psin->sin6_addr;
  802         ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
  803         if (ims == NULL)
  804                 return (ENOENT);
  805         lims = (struct in6_msource *)ims;
  806         lims->im6sl_st[1] = MCAST_UNDEFINED;
  807         return (0);
  808 }
  809 
  810 /*
  811  * Revert socket-layer filter set deltas at t1 to t0 state.
  812  */
  813 static void
  814 im6f_rollback(struct in6_mfilter *imf)
  815 {
  816         struct ip6_msource      *ims, *tims;
  817         struct in6_msource      *lims;
  818 
  819         RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
  820                 lims = (struct in6_msource *)ims;
  821                 if (lims->im6sl_st[0] == lims->im6sl_st[1]) {
  822                         /* no change at t1 */
  823                         continue;
  824                 } else if (lims->im6sl_st[0] != MCAST_UNDEFINED) {
  825                         /* revert change to existing source at t1 */
  826                         lims->im6sl_st[1] = lims->im6sl_st[0];
  827                 } else {
  828                         /* revert source added t1 */
  829                         CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
  830                         RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
  831                         free(ims, M_IN6MFILTER);
  832                         imf->im6f_nsrc--;
  833                 }
  834         }
  835         imf->im6f_st[1] = imf->im6f_st[0];
  836 }
  837 
  838 /*
  839  * Mark socket-layer filter set as INCLUDE {} at t1.
  840  */
  841 static void
  842 im6f_leave(struct in6_mfilter *imf)
  843 {
  844         struct ip6_msource      *ims;
  845         struct in6_msource      *lims;
  846 
  847         RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
  848                 lims = (struct in6_msource *)ims;
  849                 lims->im6sl_st[1] = MCAST_UNDEFINED;
  850         }
  851         imf->im6f_st[1] = MCAST_INCLUDE;
  852 }
  853 
  854 /*
  855  * Mark socket-layer filter set deltas as committed.
  856  */
  857 static void
  858 im6f_commit(struct in6_mfilter *imf)
  859 {
  860         struct ip6_msource      *ims;
  861         struct in6_msource      *lims;
  862 
  863         RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
  864                 lims = (struct in6_msource *)ims;
  865                 lims->im6sl_st[0] = lims->im6sl_st[1];
  866         }
  867         imf->im6f_st[0] = imf->im6f_st[1];
  868 }
  869 
  870 /*
  871  * Reap unreferenced sources from socket-layer filter set.
  872  */
  873 static void
  874 im6f_reap(struct in6_mfilter *imf)
  875 {
  876         struct ip6_msource      *ims, *tims;
  877         struct in6_msource      *lims;
  878 
  879         RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
  880                 lims = (struct in6_msource *)ims;
  881                 if ((lims->im6sl_st[0] == MCAST_UNDEFINED) &&
  882                     (lims->im6sl_st[1] == MCAST_UNDEFINED)) {
  883                         CTR2(KTR_MLD, "%s: free lims %p", __func__, ims);
  884                         RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
  885                         free(ims, M_IN6MFILTER);
  886                         imf->im6f_nsrc--;
  887                 }
  888         }
  889 }
  890 
  891 /*
  892  * Purge socket-layer filter set.
  893  */
  894 static void
  895 im6f_purge(struct in6_mfilter *imf)
  896 {
  897         struct ip6_msource      *ims, *tims;
  898 
  899         RB_FOREACH_SAFE(ims, ip6_msource_tree, &imf->im6f_sources, tims) {
  900                 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
  901                 RB_REMOVE(ip6_msource_tree, &imf->im6f_sources, ims);
  902                 free(ims, M_IN6MFILTER);
  903                 imf->im6f_nsrc--;
  904         }
  905         imf->im6f_st[0] = imf->im6f_st[1] = MCAST_UNDEFINED;
  906         KASSERT(RB_EMPTY(&imf->im6f_sources),
  907             ("%s: im6f_sources not empty", __func__));
  908 }
  909 
  910 /*
  911  * Look up a source filter entry for a multicast group.
  912  *
  913  * inm is the group descriptor to work with.
  914  * addr is the IPv6 address to look up.
  915  * noalloc may be non-zero to suppress allocation of sources.
  916  * *pims will be set to the address of the retrieved or allocated source.
  917  *
  918  * SMPng: NOTE: may be called with locks held.
  919  * Return 0 if successful, otherwise return a non-zero error code.
  920  */
  921 static int
  922 in6m_get_source(struct in6_multi *inm, const struct in6_addr *addr,
  923     const int noalloc, struct ip6_msource **pims)
  924 {
  925         struct ip6_msource       find;
  926         struct ip6_msource      *ims, *nims;
  927 #ifdef KTR
  928         char                     ip6tbuf[INET6_ADDRSTRLEN];
  929 #endif
  930 
  931         find.im6s_addr = *addr;
  932         ims = RB_FIND(ip6_msource_tree, &inm->in6m_srcs, &find);
  933         if (ims == NULL && !noalloc) {
  934                 if (inm->in6m_nsrc == in6_mcast_maxgrpsrc)
  935                         return (ENOSPC);
  936                 nims = malloc(sizeof(struct ip6_msource), M_IP6MSOURCE,
  937                     M_NOWAIT | M_ZERO);
  938                 if (nims == NULL)
  939                         return (ENOMEM);
  940                 nims->im6s_addr = *addr;
  941                 RB_INSERT(ip6_msource_tree, &inm->in6m_srcs, nims);
  942                 ++inm->in6m_nsrc;
  943                 ims = nims;
  944                 CTR3(KTR_MLD, "%s: allocated %s as %p", __func__,
  945                     ip6_sprintf(ip6tbuf, addr), ims);
  946         }
  947 
  948         *pims = ims;
  949         return (0);
  950 }
  951 
  952 /*
  953  * Merge socket-layer source into MLD-layer source.
  954  * If rollback is non-zero, perform the inverse of the merge.
  955  */
  956 static void
  957 im6s_merge(struct ip6_msource *ims, const struct in6_msource *lims,
  958     const int rollback)
  959 {
  960         int n = rollback ? -1 : 1;
  961 #ifdef KTR
  962         char ip6tbuf[INET6_ADDRSTRLEN];
  963 
  964         ip6_sprintf(ip6tbuf, &lims->im6s_addr);
  965 #endif
  966 
  967         if (lims->im6sl_st[0] == MCAST_EXCLUDE) {
  968                 CTR3(KTR_MLD, "%s: t1 ex -= %d on %s", __func__, n, ip6tbuf);
  969                 ims->im6s_st[1].ex -= n;
  970         } else if (lims->im6sl_st[0] == MCAST_INCLUDE) {
  971                 CTR3(KTR_MLD, "%s: t1 in -= %d on %s", __func__, n, ip6tbuf);
  972                 ims->im6s_st[1].in -= n;
  973         }
  974 
  975         if (lims->im6sl_st[1] == MCAST_EXCLUDE) {
  976                 CTR3(KTR_MLD, "%s: t1 ex += %d on %s", __func__, n, ip6tbuf);
  977                 ims->im6s_st[1].ex += n;
  978         } else if (lims->im6sl_st[1] == MCAST_INCLUDE) {
  979                 CTR3(KTR_MLD, "%s: t1 in += %d on %s", __func__, n, ip6tbuf);
  980                 ims->im6s_st[1].in += n;
  981         }
  982 }
  983 
  984 /*
  985  * Atomically update the global in6_multi state, when a membership's
  986  * filter list is being updated in any way.
  987  *
  988  * imf is the per-inpcb-membership group filter pointer.
  989  * A fake imf may be passed for in-kernel consumers.
  990  *
  991  * XXX This is a candidate for a set-symmetric-difference style loop
  992  * which would eliminate the repeated lookup from root of ims nodes,
  993  * as they share the same key space.
  994  *
  995  * If any error occurred this function will back out of refcounts
  996  * and return a non-zero value.
  997  */
  998 static int
  999 in6m_merge(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
 1000 {
 1001         struct ip6_msource      *ims, *nims;
 1002         struct in6_msource      *lims;
 1003         int                      schanged, error;
 1004         int                      nsrc0, nsrc1;
 1005 
 1006         schanged = 0;
 1007         error = 0;
 1008         nsrc1 = nsrc0 = 0;
 1009         IN6_MULTI_LIST_LOCK_ASSERT();
 1010 
 1011         /*
 1012          * Update the source filters first, as this may fail.
 1013          * Maintain count of in-mode filters at t0, t1. These are
 1014          * used to work out if we transition into ASM mode or not.
 1015          * Maintain a count of source filters whose state was
 1016          * actually modified by this operation.
 1017          */
 1018         RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
 1019                 lims = (struct in6_msource *)ims;
 1020                 if (lims->im6sl_st[0] == imf->im6f_st[0]) nsrc0++;
 1021                 if (lims->im6sl_st[1] == imf->im6f_st[1]) nsrc1++;
 1022                 if (lims->im6sl_st[0] == lims->im6sl_st[1]) continue;
 1023                 error = in6m_get_source(inm, &lims->im6s_addr, 0, &nims);
 1024                 ++schanged;
 1025                 if (error)
 1026                         break;
 1027                 im6s_merge(nims, lims, 0);
 1028         }
 1029         if (error) {
 1030                 struct ip6_msource *bims;
 1031 
 1032                 RB_FOREACH_REVERSE_FROM(ims, ip6_msource_tree, nims) {
 1033                         lims = (struct in6_msource *)ims;
 1034                         if (lims->im6sl_st[0] == lims->im6sl_st[1])
 1035                                 continue;
 1036                         (void)in6m_get_source(inm, &lims->im6s_addr, 1, &bims);
 1037                         if (bims == NULL)
 1038                                 continue;
 1039                         im6s_merge(bims, lims, 1);
 1040                 }
 1041                 goto out_reap;
 1042         }
 1043 
 1044         CTR3(KTR_MLD, "%s: imf filters in-mode: %d at t0, %d at t1",
 1045             __func__, nsrc0, nsrc1);
 1046 
 1047         /* Handle transition between INCLUDE {n} and INCLUDE {} on socket. */
 1048         if (imf->im6f_st[0] == imf->im6f_st[1] &&
 1049             imf->im6f_st[1] == MCAST_INCLUDE) {
 1050                 if (nsrc1 == 0) {
 1051                         CTR1(KTR_MLD, "%s: --in on inm at t1", __func__);
 1052                         --inm->in6m_st[1].iss_in;
 1053                 }
 1054         }
 1055 
 1056         /* Handle filter mode transition on socket. */
 1057         if (imf->im6f_st[0] != imf->im6f_st[1]) {
 1058                 CTR3(KTR_MLD, "%s: imf transition %d to %d",
 1059                     __func__, imf->im6f_st[0], imf->im6f_st[1]);
 1060 
 1061                 if (imf->im6f_st[0] == MCAST_EXCLUDE) {
 1062                         CTR1(KTR_MLD, "%s: --ex on inm at t1", __func__);
 1063                         --inm->in6m_st[1].iss_ex;
 1064                 } else if (imf->im6f_st[0] == MCAST_INCLUDE) {
 1065                         CTR1(KTR_MLD, "%s: --in on inm at t1", __func__);
 1066                         --inm->in6m_st[1].iss_in;
 1067                 }
 1068 
 1069                 if (imf->im6f_st[1] == MCAST_EXCLUDE) {
 1070                         CTR1(KTR_MLD, "%s: ex++ on inm at t1", __func__);
 1071                         inm->in6m_st[1].iss_ex++;
 1072                 } else if (imf->im6f_st[1] == MCAST_INCLUDE && nsrc1 > 0) {
 1073                         CTR1(KTR_MLD, "%s: in++ on inm at t1", __func__);
 1074                         inm->in6m_st[1].iss_in++;
 1075                 }
 1076         }
 1077 
 1078         /*
 1079          * Track inm filter state in terms of listener counts.
 1080          * If there are any exclusive listeners, stack-wide
 1081          * membership is exclusive.
 1082          * Otherwise, if only inclusive listeners, stack-wide is inclusive.
 1083          * If no listeners remain, state is undefined at t1,
 1084          * and the MLD lifecycle for this group should finish.
 1085          */
 1086         if (inm->in6m_st[1].iss_ex > 0) {
 1087                 CTR1(KTR_MLD, "%s: transition to EX", __func__);
 1088                 inm->in6m_st[1].iss_fmode = MCAST_EXCLUDE;
 1089         } else if (inm->in6m_st[1].iss_in > 0) {
 1090                 CTR1(KTR_MLD, "%s: transition to IN", __func__);
 1091                 inm->in6m_st[1].iss_fmode = MCAST_INCLUDE;
 1092         } else {
 1093                 CTR1(KTR_MLD, "%s: transition to UNDEF", __func__);
 1094                 inm->in6m_st[1].iss_fmode = MCAST_UNDEFINED;
 1095         }
 1096 
 1097         /* Decrement ASM listener count on transition out of ASM mode. */
 1098         if (imf->im6f_st[0] == MCAST_EXCLUDE && nsrc0 == 0) {
 1099                 if ((imf->im6f_st[1] != MCAST_EXCLUDE) ||
 1100                     (imf->im6f_st[1] == MCAST_EXCLUDE && nsrc1 > 0)) {
 1101                         CTR1(KTR_MLD, "%s: --asm on inm at t1", __func__);
 1102                         --inm->in6m_st[1].iss_asm;
 1103                 }
 1104         }
 1105 
 1106         /* Increment ASM listener count on transition to ASM mode. */
 1107         if (imf->im6f_st[1] == MCAST_EXCLUDE && nsrc1 == 0) {
 1108                 CTR1(KTR_MLD, "%s: asm++ on inm at t1", __func__);
 1109                 inm->in6m_st[1].iss_asm++;
 1110         }
 1111 
 1112         CTR3(KTR_MLD, "%s: merged imf %p to inm %p", __func__, imf, inm);
 1113         in6m_print(inm);
 1114 
 1115 out_reap:
 1116         if (schanged > 0) {
 1117                 CTR1(KTR_MLD, "%s: sources changed; reaping", __func__);
 1118                 in6m_reap(inm);
 1119         }
 1120         return (error);
 1121 }
 1122 
 1123 /*
 1124  * Mark an in6_multi's filter set deltas as committed.
 1125  * Called by MLD after a state change has been enqueued.
 1126  */
 1127 void
 1128 in6m_commit(struct in6_multi *inm)
 1129 {
 1130         struct ip6_msource      *ims;
 1131 
 1132         CTR2(KTR_MLD, "%s: commit inm %p", __func__, inm);
 1133         CTR1(KTR_MLD, "%s: pre commit:", __func__);
 1134         in6m_print(inm);
 1135 
 1136         RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
 1137                 ims->im6s_st[0] = ims->im6s_st[1];
 1138         }
 1139         inm->in6m_st[0] = inm->in6m_st[1];
 1140 }
 1141 
 1142 /*
 1143  * Reap unreferenced nodes from an in6_multi's filter set.
 1144  */
 1145 static void
 1146 in6m_reap(struct in6_multi *inm)
 1147 {
 1148         struct ip6_msource      *ims, *tims;
 1149 
 1150         RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs, tims) {
 1151                 if (ims->im6s_st[0].ex > 0 || ims->im6s_st[0].in > 0 ||
 1152                     ims->im6s_st[1].ex > 0 || ims->im6s_st[1].in > 0 ||
 1153                     ims->im6s_stp != 0)
 1154                         continue;
 1155                 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
 1156                 RB_REMOVE(ip6_msource_tree, &inm->in6m_srcs, ims);
 1157                 free(ims, M_IP6MSOURCE);
 1158                 inm->in6m_nsrc--;
 1159         }
 1160 }
 1161 
 1162 /*
 1163  * Purge all source nodes from an in6_multi's filter set.
 1164  */
 1165 static void
 1166 in6m_purge(struct in6_multi *inm)
 1167 {
 1168         struct ip6_msource      *ims, *tims;
 1169 
 1170         RB_FOREACH_SAFE(ims, ip6_msource_tree, &inm->in6m_srcs, tims) {
 1171                 CTR2(KTR_MLD, "%s: free ims %p", __func__, ims);
 1172                 RB_REMOVE(ip6_msource_tree, &inm->in6m_srcs, ims);
 1173                 free(ims, M_IP6MSOURCE);
 1174                 inm->in6m_nsrc--;
 1175         }
 1176         /* Free state-change requests that might be queued. */
 1177         mbufq_drain(&inm->in6m_scq);
 1178 }
 1179 
 1180 /*
 1181  * Join a multicast address w/o sources.
 1182  * KAME compatibility entry point.
 1183  *
 1184  * SMPng: Assume no mc locks held by caller.
 1185  */
 1186 int
 1187 in6_joingroup(struct ifnet *ifp, const struct in6_addr *mcaddr,
 1188     /*const*/ struct in6_mfilter *imf, struct in6_multi **pinm,
 1189     const int delay)
 1190 {
 1191         int error;
 1192 
 1193         IN6_MULTI_LOCK();
 1194         error = in6_joingroup_locked(ifp, mcaddr, NULL, pinm, delay);
 1195         IN6_MULTI_UNLOCK();
 1196         return (error);
 1197 }
 1198 
 1199 /*
 1200  * Join a multicast group; real entry point.
 1201  *
 1202  * Only preserves atomicity at inm level.
 1203  * NOTE: imf argument cannot be const due to sys/tree.h limitations.
 1204  *
 1205  * If the MLD downcall fails, the group is not joined, and an error
 1206  * code is returned.
 1207  */
 1208 static int
 1209 in6_joingroup_locked(struct ifnet *ifp, const struct in6_addr *mcaddr,
 1210     /*const*/ struct in6_mfilter *imf, struct in6_multi **pinm,
 1211     const int delay)
 1212 {
 1213         struct in6_multi_head    inmh;
 1214         struct in6_mfilter       timf;
 1215         struct in6_multi        *inm;
 1216         struct ifmultiaddr *ifma;
 1217         int                      error;
 1218 #ifdef KTR
 1219         char                     ip6tbuf[INET6_ADDRSTRLEN];
 1220 #endif
 1221 
 1222         /*
 1223          * Sanity: Check scope zone ID was set for ifp, if and
 1224          * only if group is scoped to an interface.
 1225          */
 1226         KASSERT(IN6_IS_ADDR_MULTICAST(mcaddr),
 1227             ("%s: not a multicast address", __func__));
 1228         if (IN6_IS_ADDR_MC_LINKLOCAL(mcaddr) ||
 1229             IN6_IS_ADDR_MC_INTFACELOCAL(mcaddr)) {
 1230                 KASSERT(mcaddr->s6_addr16[1] != 0,
 1231                     ("%s: scope zone ID not set", __func__));
 1232         }
 1233 
 1234         IN6_MULTI_LOCK_ASSERT();
 1235         IN6_MULTI_LIST_UNLOCK_ASSERT();
 1236 
 1237         CTR4(KTR_MLD, "%s: join %s on %p(%s))", __func__,
 1238             ip6_sprintf(ip6tbuf, mcaddr), ifp, if_name(ifp));
 1239 
 1240         error = 0;
 1241         inm = NULL;
 1242 
 1243         /*
 1244          * If no imf was specified (i.e. kernel consumer),
 1245          * fake one up and assume it is an ASM join.
 1246          */
 1247         if (imf == NULL) {
 1248                 im6f_init(&timf, MCAST_UNDEFINED, MCAST_EXCLUDE);
 1249                 imf = &timf;
 1250         }
 1251         error = in6_getmulti(ifp, mcaddr, &inm);
 1252         if (error) {
 1253                 CTR1(KTR_MLD, "%s: in6_getmulti() failure", __func__);
 1254                 return (error);
 1255         }
 1256 
 1257         IN6_MULTI_LIST_LOCK();
 1258         CTR1(KTR_MLD, "%s: merge inm state", __func__);
 1259         error = in6m_merge(inm, imf);
 1260         if (error) {
 1261                 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
 1262                 goto out_in6m_release;
 1263         }
 1264 
 1265         CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
 1266         error = mld_change_state(inm, delay);
 1267         if (error) {
 1268                 CTR1(KTR_MLD, "%s: failed to update source", __func__);
 1269                 goto out_in6m_release;
 1270         }
 1271 
 1272 out_in6m_release:
 1273         SLIST_INIT(&inmh);
 1274         if (error) {
 1275                 struct epoch_tracker et;
 1276 
 1277                 CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
 1278                 IF_ADDR_WLOCK(ifp);
 1279                 NET_EPOCH_ENTER(et);
 1280                 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
 1281                         if (ifma->ifma_protospec == inm) {
 1282                                 ifma->ifma_protospec = NULL;
 1283                                 break;
 1284                         }
 1285                 }
 1286                 in6m_disconnect_locked(&inmh, inm);
 1287                 in6m_rele_locked(&inmh, inm);
 1288                 NET_EPOCH_EXIT(et);
 1289                 IF_ADDR_WUNLOCK(ifp);
 1290         } else {
 1291                 *pinm = inm;
 1292         }
 1293         IN6_MULTI_LIST_UNLOCK();
 1294         in6m_release_list_deferred(&inmh);
 1295         return (error);
 1296 }
 1297 
 1298 /*
 1299  * Leave a multicast group; unlocked entry point.
 1300  */
 1301 int
 1302 in6_leavegroup(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
 1303 {
 1304         int error;
 1305 
 1306         IN6_MULTI_LOCK();
 1307         error = in6_leavegroup_locked(inm, imf);
 1308         IN6_MULTI_UNLOCK();
 1309         return (error);
 1310 }
 1311 
 1312 /*
 1313  * Leave a multicast group; real entry point.
 1314  * All source filters will be expunged.
 1315  *
 1316  * Only preserves atomicity at inm level.
 1317  *
 1318  * Holding the write lock for the INP which contains imf
 1319  * is highly advisable. We can't assert for it as imf does not
 1320  * contain a back-pointer to the owning inp.
 1321  *
 1322  * Note: This is not the same as in6m_release(*) as this function also
 1323  * makes a state change downcall into MLD.
 1324  */
 1325 int
 1326 in6_leavegroup_locked(struct in6_multi *inm, /*const*/ struct in6_mfilter *imf)
 1327 {
 1328         struct in6_multi_head    inmh;
 1329         struct in6_mfilter       timf;
 1330         struct ifnet *ifp;
 1331         int                      error;
 1332 #ifdef KTR
 1333         char                     ip6tbuf[INET6_ADDRSTRLEN];
 1334 #endif
 1335 
 1336         error = 0;
 1337 
 1338         IN6_MULTI_LOCK_ASSERT();
 1339 
 1340         CTR5(KTR_MLD, "%s: leave inm %p, %s/%s, imf %p", __func__,
 1341             inm, ip6_sprintf(ip6tbuf, &inm->in6m_addr),
 1342             (in6m_is_ifp_detached(inm) ? "null" : if_name(inm->in6m_ifp)),
 1343             imf);
 1344 
 1345         /*
 1346          * If no imf was specified (i.e. kernel consumer),
 1347          * fake one up and assume it is an ASM join.
 1348          */
 1349         if (imf == NULL) {
 1350                 im6f_init(&timf, MCAST_EXCLUDE, MCAST_UNDEFINED);
 1351                 imf = &timf;
 1352         }
 1353 
 1354         /*
 1355          * Begin state merge transaction at MLD layer.
 1356          *
 1357          * As this particular invocation should not cause any memory
 1358          * to be allocated, and there is no opportunity to roll back
 1359          * the transaction, it MUST NOT fail.
 1360          */
 1361 
 1362         ifp = inm->in6m_ifp;
 1363         IN6_MULTI_LIST_LOCK();
 1364         CTR1(KTR_MLD, "%s: merge inm state", __func__);
 1365         error = in6m_merge(inm, imf);
 1366         KASSERT(error == 0, ("%s: failed to merge inm state", __func__));
 1367 
 1368         CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
 1369         error = 0;
 1370         if (ifp)
 1371                 error = mld_change_state(inm, 0);
 1372         if (error)
 1373                 CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
 1374 
 1375         CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
 1376         if (ifp)
 1377                 IF_ADDR_WLOCK(ifp);
 1378 
 1379         SLIST_INIT(&inmh);
 1380         if (inm->in6m_refcount == 1)
 1381                 in6m_disconnect_locked(&inmh, inm);
 1382         in6m_rele_locked(&inmh, inm);
 1383         if (ifp)
 1384                 IF_ADDR_WUNLOCK(ifp);
 1385         IN6_MULTI_LIST_UNLOCK();
 1386         in6m_release_list_deferred(&inmh);
 1387         return (error);
 1388 }
 1389 
 1390 /*
 1391  * Block or unblock an ASM multicast source on an inpcb.
 1392  * This implements the delta-based API described in RFC 3678.
 1393  *
 1394  * The delta-based API applies only to exclusive-mode memberships.
 1395  * An MLD downcall will be performed.
 1396  *
 1397  * SMPng: NOTE: Must take Giant as a join may create a new ifma.
 1398  *
 1399  * Return 0 if successful, otherwise return an appropriate error code.
 1400  */
 1401 static int
 1402 in6p_block_unblock_source(struct inpcb *inp, struct sockopt *sopt)
 1403 {
 1404         struct group_source_req          gsr;
 1405         struct epoch_tracker             et;
 1406         sockunion_t                     *gsa, *ssa;
 1407         struct ifnet                    *ifp;
 1408         struct in6_mfilter              *imf;
 1409         struct ip6_moptions             *imo;
 1410         struct in6_msource              *ims;
 1411         struct in6_multi                        *inm;
 1412         uint16_t                         fmode;
 1413         int                              error, doblock;
 1414 #ifdef KTR
 1415         char                             ip6tbuf[INET6_ADDRSTRLEN];
 1416 #endif
 1417 
 1418         ifp = NULL;
 1419         error = 0;
 1420         doblock = 0;
 1421 
 1422         memset(&gsr, 0, sizeof(struct group_source_req));
 1423         gsa = (sockunion_t *)&gsr.gsr_group;
 1424         ssa = (sockunion_t *)&gsr.gsr_source;
 1425 
 1426         switch (sopt->sopt_name) {
 1427         case MCAST_BLOCK_SOURCE:
 1428         case MCAST_UNBLOCK_SOURCE:
 1429                 error = sooptcopyin(sopt, &gsr,
 1430                     sizeof(struct group_source_req),
 1431                     sizeof(struct group_source_req));
 1432                 if (error)
 1433                         return (error);
 1434 
 1435                 if (gsa->sin6.sin6_family != AF_INET6 ||
 1436                     gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
 1437                         return (EINVAL);
 1438 
 1439                 if (ssa->sin6.sin6_family != AF_INET6 ||
 1440                     ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
 1441                         return (EINVAL);
 1442 
 1443                 /*
 1444                  * XXXGL: this function should use ifnet_byindex_ref, or
 1445                  * expand the epoch section all the way to where we put
 1446                  * the reference.
 1447                  */
 1448                 NET_EPOCH_ENTER(et);
 1449                 ifp = ifnet_byindex(gsr.gsr_interface);
 1450                 NET_EPOCH_EXIT(et);
 1451                 if (ifp == NULL)
 1452                         return (EADDRNOTAVAIL);
 1453 
 1454                 if (sopt->sopt_name == MCAST_BLOCK_SOURCE)
 1455                         doblock = 1;
 1456                 break;
 1457 
 1458         default:
 1459                 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
 1460                     __func__, sopt->sopt_name);
 1461                 return (EOPNOTSUPP);
 1462                 break;
 1463         }
 1464 
 1465         if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
 1466                 return (EINVAL);
 1467 
 1468         (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
 1469 
 1470         /*
 1471          * Check if we are actually a member of this group.
 1472          */
 1473         imo = in6p_findmoptions(inp);
 1474         imf = im6o_match_group(imo, ifp, &gsa->sa);
 1475         if (imf == NULL) {
 1476                 error = EADDRNOTAVAIL;
 1477                 goto out_in6p_locked;
 1478         }
 1479         inm = imf->im6f_in6m;
 1480 
 1481         /*
 1482          * Attempting to use the delta-based API on an
 1483          * non exclusive-mode membership is an error.
 1484          */
 1485         fmode = imf->im6f_st[0];
 1486         if (fmode != MCAST_EXCLUDE) {
 1487                 error = EINVAL;
 1488                 goto out_in6p_locked;
 1489         }
 1490 
 1491         /*
 1492          * Deal with error cases up-front:
 1493          *  Asked to block, but already blocked; or
 1494          *  Asked to unblock, but nothing to unblock.
 1495          * If adding a new block entry, allocate it.
 1496          */
 1497         ims = im6o_match_source(imf, &ssa->sa);
 1498         if ((ims != NULL && doblock) || (ims == NULL && !doblock)) {
 1499                 CTR3(KTR_MLD, "%s: source %s %spresent", __func__,
 1500                     ip6_sprintf(ip6tbuf, &ssa->sin6.sin6_addr),
 1501                     doblock ? "" : "not ");
 1502                 error = EADDRNOTAVAIL;
 1503                 goto out_in6p_locked;
 1504         }
 1505 
 1506         INP_WLOCK_ASSERT(inp);
 1507 
 1508         /*
 1509          * Begin state merge transaction at socket layer.
 1510          */
 1511         if (doblock) {
 1512                 CTR2(KTR_MLD, "%s: %s source", __func__, "block");
 1513                 ims = im6f_graft(imf, fmode, &ssa->sin6);
 1514                 if (ims == NULL)
 1515                         error = ENOMEM;
 1516         } else {
 1517                 CTR2(KTR_MLD, "%s: %s source", __func__, "allow");
 1518                 error = im6f_prune(imf, &ssa->sin6);
 1519         }
 1520 
 1521         if (error) {
 1522                 CTR1(KTR_MLD, "%s: merge imf state failed", __func__);
 1523                 goto out_im6f_rollback;
 1524         }
 1525 
 1526         /*
 1527          * Begin state merge transaction at MLD layer.
 1528          */
 1529         IN6_MULTI_LIST_LOCK();
 1530         CTR1(KTR_MLD, "%s: merge inm state", __func__);
 1531         error = in6m_merge(inm, imf);
 1532         if (error)
 1533                 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
 1534         else {
 1535                 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
 1536                 error = mld_change_state(inm, 0);
 1537                 if (error)
 1538                         CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
 1539         }
 1540 
 1541         IN6_MULTI_LIST_UNLOCK();
 1542 
 1543 out_im6f_rollback:
 1544         if (error)
 1545                 im6f_rollback(imf);
 1546         else
 1547                 im6f_commit(imf);
 1548 
 1549         im6f_reap(imf);
 1550 
 1551 out_in6p_locked:
 1552         INP_WUNLOCK(inp);
 1553         return (error);
 1554 }
 1555 
 1556 /*
 1557  * Given an inpcb, return its multicast options structure pointer.  Accepts
 1558  * an unlocked inpcb pointer, but will return it locked.  May sleep.
 1559  *
 1560  * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held.
 1561  * SMPng: NOTE: Returns with the INP write lock held.
 1562  */
 1563 static struct ip6_moptions *
 1564 in6p_findmoptions(struct inpcb *inp)
 1565 {
 1566         struct ip6_moptions      *imo;
 1567 
 1568         INP_WLOCK(inp);
 1569         if (inp->in6p_moptions != NULL)
 1570                 return (inp->in6p_moptions);
 1571 
 1572         INP_WUNLOCK(inp);
 1573 
 1574         imo = malloc(sizeof(*imo), M_IP6MOPTS, M_WAITOK);
 1575 
 1576         imo->im6o_multicast_ifp = NULL;
 1577         imo->im6o_multicast_hlim = V_ip6_defmcasthlim;
 1578         imo->im6o_multicast_loop = in6_mcast_loop;
 1579         STAILQ_INIT(&imo->im6o_head);
 1580 
 1581         INP_WLOCK(inp);
 1582         if (inp->in6p_moptions != NULL) {
 1583                 free(imo, M_IP6MOPTS);
 1584                 return (inp->in6p_moptions);
 1585         }
 1586         inp->in6p_moptions = imo;
 1587         return (imo);
 1588 }
 1589 
 1590 /*
 1591  * Discard the IPv6 multicast options (and source filters).
 1592  *
 1593  * SMPng: NOTE: assumes INP write lock is held.
 1594  *
 1595  * XXX can all be safely deferred to epoch_call
 1596  *
 1597  */
 1598 
 1599 static void
 1600 inp_gcmoptions(struct ip6_moptions *imo)
 1601 {
 1602         struct in6_mfilter *imf;
 1603         struct in6_multi *inm;
 1604         struct ifnet *ifp;
 1605 
 1606         while ((imf = ip6_mfilter_first(&imo->im6o_head)) != NULL) {
 1607                 ip6_mfilter_remove(&imo->im6o_head, imf);
 1608 
 1609                 im6f_leave(imf);
 1610                 if ((inm = imf->im6f_in6m) != NULL) {
 1611                         if ((ifp = inm->in6m_ifp) != NULL) {
 1612                                 CURVNET_SET(ifp->if_vnet);
 1613                                 (void)in6_leavegroup(inm, imf);
 1614                                 CURVNET_RESTORE();
 1615                         } else {
 1616                                 (void)in6_leavegroup(inm, imf);
 1617                         }
 1618                 }
 1619                 ip6_mfilter_free(imf);
 1620         }
 1621         free(imo, M_IP6MOPTS);
 1622 }
 1623 
 1624 void
 1625 ip6_freemoptions(struct ip6_moptions *imo)
 1626 {
 1627         if (imo == NULL)
 1628                 return;
 1629         inp_gcmoptions(imo);
 1630 }
 1631 
 1632 /*
 1633  * Atomically get source filters on a socket for an IPv6 multicast group.
 1634  * Called with INP lock held; returns with lock released.
 1635  */
 1636 static int
 1637 in6p_get_source_filters(struct inpcb *inp, struct sockopt *sopt)
 1638 {
 1639         struct epoch_tracker     et;
 1640         struct __msfilterreq     msfr;
 1641         sockunion_t             *gsa;
 1642         struct ifnet            *ifp;
 1643         struct ip6_moptions     *imo;
 1644         struct in6_mfilter      *imf;
 1645         struct ip6_msource      *ims;
 1646         struct in6_msource      *lims;
 1647         struct sockaddr_in6     *psin;
 1648         struct sockaddr_storage *ptss;
 1649         struct sockaddr_storage *tss;
 1650         int                      error;
 1651         size_t                   nsrcs, ncsrcs;
 1652 
 1653         INP_WLOCK_ASSERT(inp);
 1654 
 1655         imo = inp->in6p_moptions;
 1656         KASSERT(imo != NULL, ("%s: null ip6_moptions", __func__));
 1657 
 1658         INP_WUNLOCK(inp);
 1659 
 1660         error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
 1661             sizeof(struct __msfilterreq));
 1662         if (error)
 1663                 return (error);
 1664 
 1665         if (msfr.msfr_group.ss_family != AF_INET6 ||
 1666             msfr.msfr_group.ss_len != sizeof(struct sockaddr_in6))
 1667                 return (EINVAL);
 1668 
 1669         gsa = (sockunion_t *)&msfr.msfr_group;
 1670         if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
 1671                 return (EINVAL);
 1672 
 1673         /*
 1674          * XXXGL: this function should use ifnet_byindex_ref, or expand the
 1675          * epoch section all the way to where the interface is referenced.
 1676          */
 1677         NET_EPOCH_ENTER(et);
 1678         ifp = ifnet_byindex(msfr.msfr_ifindex);
 1679         NET_EPOCH_EXIT(et);
 1680         if (ifp == NULL)
 1681                 return (EADDRNOTAVAIL);
 1682         (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
 1683 
 1684         INP_WLOCK(inp);
 1685 
 1686         /*
 1687          * Lookup group on the socket.
 1688          */
 1689         imf = im6o_match_group(imo, ifp, &gsa->sa);
 1690         if (imf == NULL) {
 1691                 INP_WUNLOCK(inp);
 1692                 return (EADDRNOTAVAIL);
 1693         }
 1694 
 1695         /*
 1696          * Ignore memberships which are in limbo.
 1697          */
 1698         if (imf->im6f_st[1] == MCAST_UNDEFINED) {
 1699                 INP_WUNLOCK(inp);
 1700                 return (EAGAIN);
 1701         }
 1702         msfr.msfr_fmode = imf->im6f_st[1];
 1703 
 1704         /*
 1705          * If the user specified a buffer, copy out the source filter
 1706          * entries to userland gracefully.
 1707          * We only copy out the number of entries which userland
 1708          * has asked for, but we always tell userland how big the
 1709          * buffer really needs to be.
 1710          */
 1711         if (msfr.msfr_nsrcs > in6_mcast_maxsocksrc)
 1712                 msfr.msfr_nsrcs = in6_mcast_maxsocksrc;
 1713         tss = NULL;
 1714         if (msfr.msfr_srcs != NULL && msfr.msfr_nsrcs > 0) {
 1715                 tss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
 1716                     M_TEMP, M_NOWAIT | M_ZERO);
 1717                 if (tss == NULL) {
 1718                         INP_WUNLOCK(inp);
 1719                         return (ENOBUFS);
 1720                 }
 1721         }
 1722 
 1723         /*
 1724          * Count number of sources in-mode at t0.
 1725          * If buffer space exists and remains, copy out source entries.
 1726          */
 1727         nsrcs = msfr.msfr_nsrcs;
 1728         ncsrcs = 0;
 1729         ptss = tss;
 1730         RB_FOREACH(ims, ip6_msource_tree, &imf->im6f_sources) {
 1731                 lims = (struct in6_msource *)ims;
 1732                 if (lims->im6sl_st[0] == MCAST_UNDEFINED ||
 1733                     lims->im6sl_st[0] != imf->im6f_st[0])
 1734                         continue;
 1735                 ++ncsrcs;
 1736                 if (tss != NULL && nsrcs > 0) {
 1737                         psin = (struct sockaddr_in6 *)ptss;
 1738                         psin->sin6_family = AF_INET6;
 1739                         psin->sin6_len = sizeof(struct sockaddr_in6);
 1740                         psin->sin6_addr = lims->im6s_addr;
 1741                         psin->sin6_port = 0;
 1742                         --nsrcs;
 1743                         ++ptss;
 1744                 }
 1745         }
 1746 
 1747         INP_WUNLOCK(inp);
 1748 
 1749         if (tss != NULL) {
 1750                 error = copyout(tss, msfr.msfr_srcs,
 1751                     sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
 1752                 free(tss, M_TEMP);
 1753                 if (error)
 1754                         return (error);
 1755         }
 1756 
 1757         msfr.msfr_nsrcs = ncsrcs;
 1758         error = sooptcopyout(sopt, &msfr, sizeof(struct __msfilterreq));
 1759 
 1760         return (error);
 1761 }
 1762 
 1763 /*
 1764  * Return the IP multicast options in response to user getsockopt().
 1765  */
 1766 int
 1767 ip6_getmoptions(struct inpcb *inp, struct sockopt *sopt)
 1768 {
 1769         struct ip6_moptions     *im6o;
 1770         int                      error;
 1771         u_int                    optval;
 1772 
 1773         INP_WLOCK(inp);
 1774         im6o = inp->in6p_moptions;
 1775         /* If socket is neither of type SOCK_RAW or SOCK_DGRAM, reject it. */
 1776         if (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
 1777             inp->inp_socket->so_proto->pr_type != SOCK_DGRAM) {
 1778                 INP_WUNLOCK(inp);
 1779                 return (EOPNOTSUPP);
 1780         }
 1781 
 1782         error = 0;
 1783         switch (sopt->sopt_name) {
 1784         case IPV6_MULTICAST_IF:
 1785                 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) {
 1786                         optval = 0;
 1787                 } else {
 1788                         optval = im6o->im6o_multicast_ifp->if_index;
 1789                 }
 1790                 INP_WUNLOCK(inp);
 1791                 error = sooptcopyout(sopt, &optval, sizeof(u_int));
 1792                 break;
 1793 
 1794         case IPV6_MULTICAST_HOPS:
 1795                 if (im6o == NULL)
 1796                         optval = V_ip6_defmcasthlim;
 1797                 else
 1798                         optval = im6o->im6o_multicast_hlim;
 1799                 INP_WUNLOCK(inp);
 1800                 error = sooptcopyout(sopt, &optval, sizeof(u_int));
 1801                 break;
 1802 
 1803         case IPV6_MULTICAST_LOOP:
 1804                 if (im6o == NULL)
 1805                         optval = in6_mcast_loop; /* XXX VIMAGE */
 1806                 else
 1807                         optval = im6o->im6o_multicast_loop;
 1808                 INP_WUNLOCK(inp);
 1809                 error = sooptcopyout(sopt, &optval, sizeof(u_int));
 1810                 break;
 1811 
 1812         case IPV6_MSFILTER:
 1813                 if (im6o == NULL) {
 1814                         error = EADDRNOTAVAIL;
 1815                         INP_WUNLOCK(inp);
 1816                 } else {
 1817                         error = in6p_get_source_filters(inp, sopt);
 1818                 }
 1819                 break;
 1820 
 1821         default:
 1822                 INP_WUNLOCK(inp);
 1823                 error = ENOPROTOOPT;
 1824                 break;
 1825         }
 1826 
 1827         INP_UNLOCK_ASSERT(inp);
 1828 
 1829         return (error);
 1830 }
 1831 
 1832 /*
 1833  * Look up the ifnet to use for a multicast group membership,
 1834  * given the address of an IPv6 group.
 1835  *
 1836  * This routine exists to support legacy IPv6 multicast applications.
 1837  *
 1838  * Use the socket's current FIB number for any required FIB lookup. Look up the
 1839  * group address in the unicast FIB, and use its ifp; usually, this points to
 1840  * the default next-hop.  If the FIB lookup fails, return NULL.
 1841  *
 1842  * FUTURE: Support multiple forwarding tables for IPv6.
 1843  *
 1844  * Returns NULL if no ifp could be found.
 1845  */
 1846 static struct ifnet *
 1847 in6p_lookup_mcast_ifp(const struct inpcb *inp, const struct sockaddr_in6 *gsin6)
 1848 {
 1849         struct nhop_object      *nh;
 1850         struct in6_addr         dst;
 1851         uint32_t                scopeid;
 1852         uint32_t                fibnum;
 1853 
 1854         KASSERT(gsin6->sin6_family == AF_INET6,
 1855             ("%s: not AF_INET6 group", __func__));
 1856 
 1857         in6_splitscope(&gsin6->sin6_addr, &dst, &scopeid);
 1858         fibnum = inp->inp_inc.inc_fibnum;
 1859         nh = fib6_lookup(fibnum, &dst, scopeid, 0, 0);
 1860 
 1861         return (nh ? nh->nh_ifp : NULL);
 1862 }
 1863 
 1864 /*
 1865  * Join an IPv6 multicast group, possibly with a source.
 1866  *
 1867  * FIXME: The KAME use of the unspecified address (::)
 1868  * to join *all* multicast groups is currently unsupported.
 1869  *
 1870  * XXXGL: this function multiple times uses ifnet_byindex() without
 1871  * proper protection - staying in epoch, or putting reference on ifnet.
 1872  */
 1873 static int
 1874 in6p_join_group(struct inpcb *inp, struct sockopt *sopt)
 1875 {
 1876         struct in6_multi_head            inmh;
 1877         struct group_source_req          gsr;
 1878         struct epoch_tracker             et;
 1879         sockunion_t                     *gsa, *ssa;
 1880         struct ifnet                    *ifp;
 1881         struct in6_mfilter              *imf;
 1882         struct ip6_moptions             *imo;
 1883         struct in6_multi                *inm;
 1884         struct in6_msource              *lims;
 1885         int                              error, is_new;
 1886 
 1887         SLIST_INIT(&inmh);
 1888         ifp = NULL;
 1889         lims = NULL;
 1890         error = 0;
 1891 
 1892         memset(&gsr, 0, sizeof(struct group_source_req));
 1893         gsa = (sockunion_t *)&gsr.gsr_group;
 1894         gsa->ss.ss_family = AF_UNSPEC;
 1895         ssa = (sockunion_t *)&gsr.gsr_source;
 1896         ssa->ss.ss_family = AF_UNSPEC;
 1897 
 1898         /*
 1899          * Chew everything into struct group_source_req.
 1900          * Overwrite the port field if present, as the sockaddr
 1901          * being copied in may be matched with a binary comparison.
 1902          * Ignore passed-in scope ID.
 1903          */
 1904         switch (sopt->sopt_name) {
 1905         case IPV6_JOIN_GROUP: {
 1906                 struct ipv6_mreq mreq;
 1907 
 1908                 error = sooptcopyin(sopt, &mreq, sizeof(struct ipv6_mreq),
 1909                     sizeof(struct ipv6_mreq));
 1910                 if (error)
 1911                         return (error);
 1912 
 1913                 gsa->sin6.sin6_family = AF_INET6;
 1914                 gsa->sin6.sin6_len = sizeof(struct sockaddr_in6);
 1915                 gsa->sin6.sin6_addr = mreq.ipv6mr_multiaddr;
 1916 
 1917                 if (mreq.ipv6mr_interface == 0) {
 1918                         ifp = in6p_lookup_mcast_ifp(inp, &gsa->sin6);
 1919                 } else {
 1920                         NET_EPOCH_ENTER(et);
 1921                         ifp = ifnet_byindex(mreq.ipv6mr_interface);
 1922                         NET_EPOCH_EXIT(et);
 1923                         if (ifp == NULL)
 1924                                 return (EADDRNOTAVAIL);
 1925                 }
 1926                 CTR3(KTR_MLD, "%s: ipv6mr_interface = %d, ifp = %p",
 1927                     __func__, mreq.ipv6mr_interface, ifp);
 1928         } break;
 1929 
 1930         case MCAST_JOIN_GROUP:
 1931         case MCAST_JOIN_SOURCE_GROUP:
 1932                 if (sopt->sopt_name == MCAST_JOIN_GROUP) {
 1933                         error = sooptcopyin(sopt, &gsr,
 1934                             sizeof(struct group_req),
 1935                             sizeof(struct group_req));
 1936                 } else if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
 1937                         error = sooptcopyin(sopt, &gsr,
 1938                             sizeof(struct group_source_req),
 1939                             sizeof(struct group_source_req));
 1940                 }
 1941                 if (error)
 1942                         return (error);
 1943 
 1944                 if (gsa->sin6.sin6_family != AF_INET6 ||
 1945                     gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
 1946                         return (EINVAL);
 1947 
 1948                 if (sopt->sopt_name == MCAST_JOIN_SOURCE_GROUP) {
 1949                         if (ssa->sin6.sin6_family != AF_INET6 ||
 1950                             ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
 1951                                 return (EINVAL);
 1952                         if (IN6_IS_ADDR_MULTICAST(&ssa->sin6.sin6_addr))
 1953                                 return (EINVAL);
 1954                         /*
 1955                          * TODO: Validate embedded scope ID in source
 1956                          * list entry against passed-in ifp, if and only
 1957                          * if source list filter entry is iface or node local.
 1958                          */
 1959                         in6_clearscope(&ssa->sin6.sin6_addr);
 1960                         ssa->sin6.sin6_port = 0;
 1961                         ssa->sin6.sin6_scope_id = 0;
 1962                 }
 1963                 NET_EPOCH_ENTER(et);
 1964                 ifp = ifnet_byindex(gsr.gsr_interface);
 1965                 NET_EPOCH_EXIT(et);
 1966                 if (ifp == NULL)
 1967                         return (EADDRNOTAVAIL);
 1968                 break;
 1969 
 1970         default:
 1971                 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
 1972                     __func__, sopt->sopt_name);
 1973                 return (EOPNOTSUPP);
 1974                 break;
 1975         }
 1976 
 1977         if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
 1978                 return (EINVAL);
 1979 
 1980         if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0)
 1981                 return (EADDRNOTAVAIL);
 1982 
 1983         gsa->sin6.sin6_port = 0;
 1984         gsa->sin6.sin6_scope_id = 0;
 1985 
 1986         /*
 1987          * Always set the scope zone ID on memberships created from userland.
 1988          * Use the passed-in ifp to do this.
 1989          * XXX The in6_setscope() return value is meaningless.
 1990          * XXX SCOPE6_LOCK() is taken by in6_setscope().
 1991          */
 1992         (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
 1993 
 1994         IN6_MULTI_LOCK();
 1995 
 1996         /*
 1997          * Find the membership in the membership list.
 1998          */
 1999         imo = in6p_findmoptions(inp);
 2000         imf = im6o_match_group(imo, ifp, &gsa->sa);
 2001         if (imf == NULL) {
 2002                 is_new = 1;
 2003                 inm = NULL;
 2004 
 2005                 if (ip6_mfilter_count(&imo->im6o_head) >= IPV6_MAX_MEMBERSHIPS) {
 2006                         error = ENOMEM;
 2007                         goto out_in6p_locked;
 2008                 }
 2009         } else {
 2010                 is_new = 0;
 2011                 inm = imf->im6f_in6m;
 2012 
 2013                 if (ssa->ss.ss_family != AF_UNSPEC) {
 2014                         /*
 2015                          * MCAST_JOIN_SOURCE_GROUP on an exclusive membership
 2016                          * is an error. On an existing inclusive membership,
 2017                          * it just adds the source to the filter list.
 2018                          */
 2019                         if (imf->im6f_st[1] != MCAST_INCLUDE) {
 2020                                 error = EINVAL;
 2021                                 goto out_in6p_locked;
 2022                         }
 2023                         /*
 2024                          * Throw out duplicates.
 2025                          *
 2026                          * XXX FIXME: This makes a naive assumption that
 2027                          * even if entries exist for *ssa in this imf,
 2028                          * they will be rejected as dupes, even if they
 2029                          * are not valid in the current mode (in-mode).
 2030                          *
 2031                          * in6_msource is transactioned just as for anything
 2032                          * else in SSM -- but note naive use of in6m_graft()
 2033                          * below for allocating new filter entries.
 2034                          *
 2035                          * This is only an issue if someone mixes the
 2036                          * full-state SSM API with the delta-based API,
 2037                          * which is discouraged in the relevant RFCs.
 2038                          */
 2039                         lims = im6o_match_source(imf, &ssa->sa);
 2040                         if (lims != NULL /*&&
 2041                             lims->im6sl_st[1] == MCAST_INCLUDE*/) {
 2042                                 error = EADDRNOTAVAIL;
 2043                                 goto out_in6p_locked;
 2044                         }
 2045                 } else {
 2046                         /*
 2047                          * MCAST_JOIN_GROUP alone, on any existing membership,
 2048                          * is rejected, to stop the same inpcb tying up
 2049                          * multiple refs to the in_multi.
 2050                          * On an existing inclusive membership, this is also
 2051                          * an error; if you want to change filter mode,
 2052                          * you must use the userland API setsourcefilter().
 2053                          * XXX We don't reject this for imf in UNDEFINED
 2054                          * state at t1, because allocation of a filter
 2055                          * is atomic with allocation of a membership.
 2056                          */
 2057                         error = EADDRINUSE;
 2058                         goto out_in6p_locked;
 2059                 }
 2060         }
 2061 
 2062         /*
 2063          * Begin state merge transaction at socket layer.
 2064          */
 2065         INP_WLOCK_ASSERT(inp);
 2066 
 2067         /*
 2068          * Graft new source into filter list for this inpcb's
 2069          * membership of the group. The in6_multi may not have
 2070          * been allocated yet if this is a new membership, however,
 2071          * the in_mfilter slot will be allocated and must be initialized.
 2072          *
 2073          * Note: Grafting of exclusive mode filters doesn't happen
 2074          * in this path.
 2075          * XXX: Should check for non-NULL lims (node exists but may
 2076          * not be in-mode) for interop with full-state API.
 2077          */
 2078         if (ssa->ss.ss_family != AF_UNSPEC) {
 2079                 /* Membership starts in IN mode */
 2080                 if (is_new) {
 2081                         CTR1(KTR_MLD, "%s: new join w/source", __func__);
 2082                         imf = ip6_mfilter_alloc(M_NOWAIT, MCAST_UNDEFINED, MCAST_INCLUDE);
 2083                         if (imf == NULL) {
 2084                                 error = ENOMEM;
 2085                                 goto out_in6p_locked;
 2086                         }
 2087                 } else {
 2088                         CTR2(KTR_MLD, "%s: %s source", __func__, "allow");
 2089                 }
 2090                 lims = im6f_graft(imf, MCAST_INCLUDE, &ssa->sin6);
 2091                 if (lims == NULL) {
 2092                         CTR1(KTR_MLD, "%s: merge imf state failed",
 2093                             __func__);
 2094                         error = ENOMEM;
 2095                         goto out_in6p_locked;
 2096                 }
 2097         } else {
 2098                 /* No address specified; Membership starts in EX mode */
 2099                 if (is_new) {
 2100                         CTR1(KTR_MLD, "%s: new join w/o source", __func__);
 2101                         imf = ip6_mfilter_alloc(M_NOWAIT, MCAST_UNDEFINED, MCAST_EXCLUDE);
 2102                         if (imf == NULL) {
 2103                                 error = ENOMEM;
 2104                                 goto out_in6p_locked;
 2105                         }
 2106                 }
 2107         }
 2108 
 2109         /*
 2110          * Begin state merge transaction at MLD layer.
 2111          */
 2112         if (is_new) {
 2113                 in_pcbref(inp);
 2114                 INP_WUNLOCK(inp);
 2115 
 2116                 error = in6_joingroup_locked(ifp, &gsa->sin6.sin6_addr, imf,
 2117                     &imf->im6f_in6m, 0);
 2118 
 2119                 INP_WLOCK(inp);
 2120                 if (in_pcbrele_wlocked(inp)) {
 2121                         error = ENXIO;
 2122                         goto out_in6p_unlocked;
 2123                 }
 2124                 if (error) {
 2125                         goto out_in6p_locked;
 2126                 }
 2127                 /*
 2128                  * NOTE: Refcount from in6_joingroup_locked()
 2129                  * is protecting membership.
 2130                  */
 2131                 ip6_mfilter_insert(&imo->im6o_head, imf);
 2132         } else {
 2133                 CTR1(KTR_MLD, "%s: merge inm state", __func__);
 2134                 IN6_MULTI_LIST_LOCK();
 2135                 error = in6m_merge(inm, imf);
 2136                 if (error) {
 2137                         CTR1(KTR_MLD, "%s: failed to merge inm state",
 2138                             __func__);
 2139                         IN6_MULTI_LIST_UNLOCK();
 2140                         im6f_rollback(imf);
 2141                         im6f_reap(imf);
 2142                         goto out_in6p_locked;
 2143                 }
 2144                 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
 2145                 error = mld_change_state(inm, 0);
 2146                 IN6_MULTI_LIST_UNLOCK();
 2147 
 2148                 if (error) {
 2149                         CTR1(KTR_MLD, "%s: failed mld downcall",
 2150                              __func__);
 2151                         im6f_rollback(imf);
 2152                         im6f_reap(imf);
 2153                         goto out_in6p_locked;
 2154                 }
 2155         }
 2156 
 2157         im6f_commit(imf);
 2158         imf = NULL;
 2159 
 2160 out_in6p_locked:
 2161         INP_WUNLOCK(inp);
 2162 out_in6p_unlocked:
 2163         IN6_MULTI_UNLOCK();
 2164 
 2165         if (is_new && imf) {
 2166                 if (imf->im6f_in6m != NULL) {
 2167                         struct in6_multi_head inmh;
 2168 
 2169                         SLIST_INIT(&inmh);
 2170                         SLIST_INSERT_HEAD(&inmh, imf->im6f_in6m, in6m_defer);
 2171                         in6m_release_list_deferred(&inmh);
 2172                 }
 2173                 ip6_mfilter_free(imf);
 2174         }
 2175         return (error);
 2176 }
 2177 
 2178 /*
 2179  * Leave an IPv6 multicast group on an inpcb, possibly with a source.
 2180  */
 2181 static int
 2182 in6p_leave_group(struct inpcb *inp, struct sockopt *sopt)
 2183 {
 2184         struct ipv6_mreq                 mreq;
 2185         struct group_source_req          gsr;
 2186         struct epoch_tracker             et;
 2187         sockunion_t                     *gsa, *ssa;
 2188         struct ifnet                    *ifp;
 2189         struct in6_mfilter              *imf;
 2190         struct ip6_moptions             *imo;
 2191         struct in6_msource              *ims;
 2192         struct in6_multi                *inm;
 2193         uint32_t                         ifindex;
 2194         int                              error;
 2195         bool                             is_final;
 2196 #ifdef KTR
 2197         char                             ip6tbuf[INET6_ADDRSTRLEN];
 2198 #endif
 2199 
 2200         ifp = NULL;
 2201         ifindex = 0;
 2202         error = 0;
 2203         is_final = true;
 2204 
 2205         memset(&gsr, 0, sizeof(struct group_source_req));
 2206         gsa = (sockunion_t *)&gsr.gsr_group;
 2207         gsa->ss.ss_family = AF_UNSPEC;
 2208         ssa = (sockunion_t *)&gsr.gsr_source;
 2209         ssa->ss.ss_family = AF_UNSPEC;
 2210 
 2211         /*
 2212          * Chew everything passed in up into a struct group_source_req
 2213          * as that is easier to process.
 2214          * Note: Any embedded scope ID in the multicast group passed
 2215          * in by userland is ignored, the interface index is the recommended
 2216          * mechanism to specify an interface; see below.
 2217          */
 2218         switch (sopt->sopt_name) {
 2219         case IPV6_LEAVE_GROUP:
 2220                 error = sooptcopyin(sopt, &mreq, sizeof(struct ipv6_mreq),
 2221                     sizeof(struct ipv6_mreq));
 2222                 if (error)
 2223                         return (error);
 2224                 gsa->sin6.sin6_family = AF_INET6;
 2225                 gsa->sin6.sin6_len = sizeof(struct sockaddr_in6);
 2226                 gsa->sin6.sin6_addr = mreq.ipv6mr_multiaddr;
 2227                 gsa->sin6.sin6_port = 0;
 2228                 gsa->sin6.sin6_scope_id = 0;
 2229                 ifindex = mreq.ipv6mr_interface;
 2230                 break;
 2231 
 2232         case MCAST_LEAVE_GROUP:
 2233         case MCAST_LEAVE_SOURCE_GROUP:
 2234                 if (sopt->sopt_name == MCAST_LEAVE_GROUP) {
 2235                         error = sooptcopyin(sopt, &gsr,
 2236                             sizeof(struct group_req),
 2237                             sizeof(struct group_req));
 2238                 } else if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
 2239                         error = sooptcopyin(sopt, &gsr,
 2240                             sizeof(struct group_source_req),
 2241                             sizeof(struct group_source_req));
 2242                 }
 2243                 if (error)
 2244                         return (error);
 2245 
 2246                 if (gsa->sin6.sin6_family != AF_INET6 ||
 2247                     gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
 2248                         return (EINVAL);
 2249                 if (sopt->sopt_name == MCAST_LEAVE_SOURCE_GROUP) {
 2250                         if (ssa->sin6.sin6_family != AF_INET6 ||
 2251                             ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
 2252                                 return (EINVAL);
 2253                         if (IN6_IS_ADDR_MULTICAST(&ssa->sin6.sin6_addr))
 2254                                 return (EINVAL);
 2255                         /*
 2256                          * TODO: Validate embedded scope ID in source
 2257                          * list entry against passed-in ifp, if and only
 2258                          * if source list filter entry is iface or node local.
 2259                          */
 2260                         in6_clearscope(&ssa->sin6.sin6_addr);
 2261                 }
 2262                 gsa->sin6.sin6_port = 0;
 2263                 gsa->sin6.sin6_scope_id = 0;
 2264                 ifindex = gsr.gsr_interface;
 2265                 break;
 2266 
 2267         default:
 2268                 CTR2(KTR_MLD, "%s: unknown sopt_name %d",
 2269                     __func__, sopt->sopt_name);
 2270                 return (EOPNOTSUPP);
 2271                 break;
 2272         }
 2273 
 2274         if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
 2275                 return (EINVAL);
 2276 
 2277         /*
 2278          * Validate interface index if provided. If no interface index
 2279          * was provided separately, attempt to look the membership up
 2280          * from the default scope as a last resort to disambiguate
 2281          * the membership we are being asked to leave.
 2282          * XXX SCOPE6 lock potentially taken here.
 2283          */
 2284         if (ifindex != 0) {
 2285                 NET_EPOCH_ENTER(et);
 2286                 ifp = ifnet_byindex(ifindex);
 2287                 NET_EPOCH_EXIT(et);     /* XXXGL: unsafe ifp */
 2288                 if (ifp == NULL)
 2289                         return (EADDRNOTAVAIL);
 2290                 (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
 2291         } else {
 2292                 error = sa6_embedscope(&gsa->sin6, V_ip6_use_defzone);
 2293                 if (error)
 2294                         return (EADDRNOTAVAIL);
 2295                 /*
 2296                  * Some badly behaved applications don't pass an ifindex
 2297                  * or a scope ID, which is an API violation. In this case,
 2298                  * perform a lookup as per a v6 join.
 2299                  *
 2300                  * XXX For now, stomp on zone ID for the corner case.
 2301                  * This is not the 'KAME way', but we need to see the ifp
 2302                  * directly until such time as this implementation is
 2303                  * refactored, assuming the scope IDs are the way to go.
 2304                  */
 2305                 ifindex = ntohs(gsa->sin6.sin6_addr.s6_addr16[1]);
 2306                 if (ifindex == 0) {
 2307                         CTR2(KTR_MLD, "%s: warning: no ifindex, looking up "
 2308                             "ifp for group %s.", __func__,
 2309                             ip6_sprintf(ip6tbuf, &gsa->sin6.sin6_addr));
 2310                         ifp = in6p_lookup_mcast_ifp(inp, &gsa->sin6);
 2311                 } else {
 2312                         NET_EPOCH_ENTER(et);
 2313                         ifp = ifnet_byindex(ifindex);
 2314                         NET_EPOCH_EXIT(et);     /* XXXGL: unsafe ifp */
 2315                 }
 2316                 if (ifp == NULL)
 2317                         return (EADDRNOTAVAIL);
 2318         }
 2319 
 2320         CTR2(KTR_MLD, "%s: ifp = %p", __func__, ifp);
 2321         KASSERT(ifp != NULL, ("%s: ifp did not resolve", __func__));
 2322 
 2323         IN6_MULTI_LOCK();
 2324 
 2325         /*
 2326          * Find the membership in the membership list.
 2327          */
 2328         imo = in6p_findmoptions(inp);
 2329         imf = im6o_match_group(imo, ifp, &gsa->sa);
 2330         if (imf == NULL) {
 2331                 error = EADDRNOTAVAIL;
 2332                 goto out_in6p_locked;
 2333         }
 2334         inm = imf->im6f_in6m;
 2335 
 2336         if (ssa->ss.ss_family != AF_UNSPEC)
 2337                 is_final = false;
 2338 
 2339         /*
 2340          * Begin state merge transaction at socket layer.
 2341          */
 2342         INP_WLOCK_ASSERT(inp);
 2343 
 2344         /*
 2345          * If we were instructed only to leave a given source, do so.
 2346          * MCAST_LEAVE_SOURCE_GROUP is only valid for inclusive memberships.
 2347          */
 2348         if (is_final) {
 2349                 ip6_mfilter_remove(&imo->im6o_head, imf);
 2350                 im6f_leave(imf);
 2351 
 2352                 /*
 2353                  * Give up the multicast address record to which
 2354                  * the membership points.
 2355                  */
 2356                 (void)in6_leavegroup_locked(inm, imf);
 2357         } else {
 2358                 if (imf->im6f_st[0] == MCAST_EXCLUDE) {
 2359                         error = EADDRNOTAVAIL;
 2360                         goto out_in6p_locked;
 2361                 }
 2362                 ims = im6o_match_source(imf, &ssa->sa);
 2363                 if (ims == NULL) {
 2364                         CTR3(KTR_MLD, "%s: source %p %spresent", __func__,
 2365                             ip6_sprintf(ip6tbuf, &ssa->sin6.sin6_addr),
 2366                             "not ");
 2367                         error = EADDRNOTAVAIL;
 2368                         goto out_in6p_locked;
 2369                 }
 2370                 CTR2(KTR_MLD, "%s: %s source", __func__, "block");
 2371                 error = im6f_prune(imf, &ssa->sin6);
 2372                 if (error) {
 2373                         CTR1(KTR_MLD, "%s: merge imf state failed",
 2374                             __func__);
 2375                         goto out_in6p_locked;
 2376                 }
 2377         }
 2378 
 2379         /*
 2380          * Begin state merge transaction at MLD layer.
 2381          */
 2382         if (!is_final) {
 2383                 CTR1(KTR_MLD, "%s: merge inm state", __func__);
 2384                 IN6_MULTI_LIST_LOCK();
 2385                 error = in6m_merge(inm, imf);
 2386                 if (error) {
 2387                         CTR1(KTR_MLD, "%s: failed to merge inm state",
 2388                             __func__);
 2389                         IN6_MULTI_LIST_UNLOCK();
 2390                         im6f_rollback(imf);
 2391                         im6f_reap(imf);
 2392                         goto out_in6p_locked;
 2393                 }
 2394 
 2395                 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
 2396                 error = mld_change_state(inm, 0);
 2397                 IN6_MULTI_LIST_UNLOCK();
 2398                 if (error) {
 2399                         CTR1(KTR_MLD, "%s: failed mld downcall",
 2400                              __func__);
 2401                         im6f_rollback(imf);
 2402                         im6f_reap(imf);
 2403                         goto out_in6p_locked;
 2404                 }
 2405         }
 2406 
 2407         im6f_commit(imf);
 2408         im6f_reap(imf);
 2409 
 2410 out_in6p_locked:
 2411         INP_WUNLOCK(inp);
 2412 
 2413         if (is_final && imf)
 2414                 ip6_mfilter_free(imf);
 2415 
 2416         IN6_MULTI_UNLOCK();
 2417         return (error);
 2418 }
 2419 
 2420 /*
 2421  * Select the interface for transmitting IPv6 multicast datagrams.
 2422  *
 2423  * Either an instance of struct in6_addr or an instance of struct ipv6_mreqn
 2424  * may be passed to this socket option. An address of in6addr_any or an
 2425  * interface index of 0 is used to remove a previous selection.
 2426  * When no interface is selected, one is chosen for every send.
 2427  */
 2428 static int
 2429 in6p_set_multicast_if(struct inpcb *inp, struct sockopt *sopt)
 2430 {
 2431         struct epoch_tracker     et;
 2432         struct ifnet            *ifp;
 2433         struct ip6_moptions     *imo;
 2434         u_int                    ifindex;
 2435         int                      error;
 2436 
 2437         if (sopt->sopt_valsize != sizeof(u_int))
 2438                 return (EINVAL);
 2439 
 2440         error = sooptcopyin(sopt, &ifindex, sizeof(u_int), sizeof(u_int));
 2441         if (error)
 2442                 return (error);
 2443         NET_EPOCH_ENTER(et);
 2444         if (ifindex == 0)
 2445                 ifp = NULL;
 2446         else {
 2447                 ifp = ifnet_byindex(ifindex);
 2448                 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
 2449                         NET_EPOCH_EXIT(et);
 2450                         return (EADDRNOTAVAIL);
 2451                 }
 2452         }
 2453         NET_EPOCH_EXIT(et);     /* XXXGL: unsafe ifp */
 2454         imo = in6p_findmoptions(inp);
 2455         imo->im6o_multicast_ifp = ifp;
 2456         INP_WUNLOCK(inp);
 2457 
 2458         return (0);
 2459 }
 2460 
 2461 /*
 2462  * Atomically set source filters on a socket for an IPv6 multicast group.
 2463  *
 2464  * XXXGL: unsafely exits epoch with ifnet pointer
 2465  */
 2466 static int
 2467 in6p_set_source_filters(struct inpcb *inp, struct sockopt *sopt)
 2468 {
 2469         struct __msfilterreq     msfr;
 2470         struct epoch_tracker     et;
 2471         sockunion_t             *gsa;
 2472         struct ifnet            *ifp;
 2473         struct in6_mfilter      *imf;
 2474         struct ip6_moptions     *imo;
 2475         struct in6_multi                *inm;
 2476         int                      error;
 2477 
 2478         error = sooptcopyin(sopt, &msfr, sizeof(struct __msfilterreq),
 2479             sizeof(struct __msfilterreq));
 2480         if (error)
 2481                 return (error);
 2482 
 2483         if (msfr.msfr_nsrcs > in6_mcast_maxsocksrc)
 2484                 return (ENOBUFS);
 2485 
 2486         if (msfr.msfr_fmode != MCAST_EXCLUDE &&
 2487             msfr.msfr_fmode != MCAST_INCLUDE)
 2488                 return (EINVAL);
 2489 
 2490         if (msfr.msfr_group.ss_family != AF_INET6 ||
 2491             msfr.msfr_group.ss_len != sizeof(struct sockaddr_in6))
 2492                 return (EINVAL);
 2493 
 2494         gsa = (sockunion_t *)&msfr.msfr_group;
 2495         if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))
 2496                 return (EINVAL);
 2497 
 2498         gsa->sin6.sin6_port = 0;        /* ignore port */
 2499 
 2500         NET_EPOCH_ENTER(et);
 2501         ifp = ifnet_byindex(msfr.msfr_ifindex);
 2502         NET_EPOCH_EXIT(et);
 2503         if (ifp == NULL)
 2504                 return (EADDRNOTAVAIL);
 2505         (void)in6_setscope(&gsa->sin6.sin6_addr, ifp, NULL);
 2506 
 2507         /*
 2508          * Take the INP write lock.
 2509          * Check if this socket is a member of this group.
 2510          */
 2511         imo = in6p_findmoptions(inp);
 2512         imf = im6o_match_group(imo, ifp, &gsa->sa);
 2513         if (imf == NULL) {
 2514                 error = EADDRNOTAVAIL;
 2515                 goto out_in6p_locked;
 2516         }
 2517         inm = imf->im6f_in6m;
 2518 
 2519         /*
 2520          * Begin state merge transaction at socket layer.
 2521          */
 2522         INP_WLOCK_ASSERT(inp);
 2523 
 2524         imf->im6f_st[1] = msfr.msfr_fmode;
 2525 
 2526         /*
 2527          * Apply any new source filters, if present.
 2528          * Make a copy of the user-space source vector so
 2529          * that we may copy them with a single copyin. This
 2530          * allows us to deal with page faults up-front.
 2531          */
 2532         if (msfr.msfr_nsrcs > 0) {
 2533                 struct in6_msource      *lims;
 2534                 struct sockaddr_in6     *psin;
 2535                 struct sockaddr_storage *kss, *pkss;
 2536                 int                      i;
 2537 
 2538                 INP_WUNLOCK(inp);
 2539 
 2540                 CTR2(KTR_MLD, "%s: loading %lu source list entries",
 2541                     __func__, (unsigned long)msfr.msfr_nsrcs);
 2542                 kss = malloc(sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs,
 2543                     M_TEMP, M_WAITOK);
 2544                 error = copyin(msfr.msfr_srcs, kss,
 2545                     sizeof(struct sockaddr_storage) * msfr.msfr_nsrcs);
 2546                 if (error) {
 2547                         free(kss, M_TEMP);
 2548                         return (error);
 2549                 }
 2550 
 2551                 INP_WLOCK(inp);
 2552 
 2553                 /*
 2554                  * Mark all source filters as UNDEFINED at t1.
 2555                  * Restore new group filter mode, as im6f_leave()
 2556                  * will set it to INCLUDE.
 2557                  */
 2558                 im6f_leave(imf);
 2559                 imf->im6f_st[1] = msfr.msfr_fmode;
 2560 
 2561                 /*
 2562                  * Update socket layer filters at t1, lazy-allocating
 2563                  * new entries. This saves a bunch of memory at the
 2564                  * cost of one RB_FIND() per source entry; duplicate
 2565                  * entries in the msfr_nsrcs vector are ignored.
 2566                  * If we encounter an error, rollback transaction.
 2567                  *
 2568                  * XXX This too could be replaced with a set-symmetric
 2569                  * difference like loop to avoid walking from root
 2570                  * every time, as the key space is common.
 2571                  */
 2572                 for (i = 0, pkss = kss; i < msfr.msfr_nsrcs; i++, pkss++) {
 2573                         psin = (struct sockaddr_in6 *)pkss;
 2574                         if (psin->sin6_family != AF_INET6) {
 2575                                 error = EAFNOSUPPORT;
 2576                                 break;
 2577                         }
 2578                         if (psin->sin6_len != sizeof(struct sockaddr_in6)) {
 2579                                 error = EINVAL;
 2580                                 break;
 2581                         }
 2582                         if (IN6_IS_ADDR_MULTICAST(&psin->sin6_addr)) {
 2583                                 error = EINVAL;
 2584                                 break;
 2585                         }
 2586                         /*
 2587                          * TODO: Validate embedded scope ID in source
 2588                          * list entry against passed-in ifp, if and only
 2589                          * if source list filter entry is iface or node local.
 2590                          */
 2591                         in6_clearscope(&psin->sin6_addr);
 2592                         error = im6f_get_source(imf, psin, &lims);
 2593                         if (error)
 2594                                 break;
 2595                         lims->im6sl_st[1] = imf->im6f_st[1];
 2596                 }
 2597                 free(kss, M_TEMP);
 2598         }
 2599 
 2600         if (error)
 2601                 goto out_im6f_rollback;
 2602 
 2603         INP_WLOCK_ASSERT(inp);
 2604         IN6_MULTI_LIST_LOCK();
 2605 
 2606         /*
 2607          * Begin state merge transaction at MLD layer.
 2608          */
 2609         CTR1(KTR_MLD, "%s: merge inm state", __func__);
 2610         error = in6m_merge(inm, imf);
 2611         if (error)
 2612                 CTR1(KTR_MLD, "%s: failed to merge inm state", __func__);
 2613         else {
 2614                 CTR1(KTR_MLD, "%s: doing mld downcall", __func__);
 2615                 error = mld_change_state(inm, 0);
 2616                 if (error)
 2617                         CTR1(KTR_MLD, "%s: failed mld downcall", __func__);
 2618         }
 2619 
 2620         IN6_MULTI_LIST_UNLOCK();
 2621 
 2622 out_im6f_rollback:
 2623         if (error)
 2624                 im6f_rollback(imf);
 2625         else
 2626                 im6f_commit(imf);
 2627 
 2628         im6f_reap(imf);
 2629 
 2630 out_in6p_locked:
 2631         INP_WUNLOCK(inp);
 2632         return (error);
 2633 }
 2634 
 2635 /*
 2636  * Set the IP multicast options in response to user setsockopt().
 2637  *
 2638  * Many of the socket options handled in this function duplicate the
 2639  * functionality of socket options in the regular unicast API. However,
 2640  * it is not possible to merge the duplicate code, because the idempotence
 2641  * of the IPv6 multicast part of the BSD Sockets API must be preserved;
 2642  * the effects of these options must be treated as separate and distinct.
 2643  *
 2644  * SMPng: XXX: Unlocked read of inp_socket believed OK.
 2645  */
 2646 int
 2647 ip6_setmoptions(struct inpcb *inp, struct sockopt *sopt)
 2648 {
 2649         struct ip6_moptions     *im6o;
 2650         int                      error;
 2651 
 2652         error = 0;
 2653 
 2654         /* If socket is neither of type SOCK_RAW or SOCK_DGRAM, reject it. */
 2655         if (inp->inp_socket->so_proto->pr_type != SOCK_RAW &&
 2656              inp->inp_socket->so_proto->pr_type != SOCK_DGRAM)
 2657                 return (EOPNOTSUPP);
 2658 
 2659         switch (sopt->sopt_name) {
 2660         case IPV6_MULTICAST_IF:
 2661                 error = in6p_set_multicast_if(inp, sopt);
 2662                 break;
 2663 
 2664         case IPV6_MULTICAST_HOPS: {
 2665                 int hlim;
 2666 
 2667                 if (sopt->sopt_valsize != sizeof(int)) {
 2668                         error = EINVAL;
 2669                         break;
 2670                 }
 2671                 error = sooptcopyin(sopt, &hlim, sizeof(hlim), sizeof(int));
 2672                 if (error)
 2673                         break;
 2674                 if (hlim < -1 || hlim > 255) {
 2675                         error = EINVAL;
 2676                         break;
 2677                 } else if (hlim == -1) {
 2678                         hlim = V_ip6_defmcasthlim;
 2679                 }
 2680                 im6o = in6p_findmoptions(inp);
 2681                 im6o->im6o_multicast_hlim = hlim;
 2682                 INP_WUNLOCK(inp);
 2683                 break;
 2684         }
 2685 
 2686         case IPV6_MULTICAST_LOOP: {
 2687                 u_int loop;
 2688 
 2689                 /*
 2690                  * Set the loopback flag for outgoing multicast packets.
 2691                  * Must be zero or one.
 2692                  */
 2693                 if (sopt->sopt_valsize != sizeof(u_int)) {
 2694                         error = EINVAL;
 2695                         break;
 2696                 }
 2697                 error = sooptcopyin(sopt, &loop, sizeof(u_int), sizeof(u_int));
 2698                 if (error)
 2699                         break;
 2700                 if (loop > 1) {
 2701                         error = EINVAL;
 2702                         break;
 2703                 }
 2704                 im6o = in6p_findmoptions(inp);
 2705                 im6o->im6o_multicast_loop = loop;
 2706                 INP_WUNLOCK(inp);
 2707                 break;
 2708         }
 2709 
 2710         case IPV6_JOIN_GROUP:
 2711         case MCAST_JOIN_GROUP:
 2712         case MCAST_JOIN_SOURCE_GROUP:
 2713                 error = in6p_join_group(inp, sopt);
 2714                 break;
 2715 
 2716         case IPV6_LEAVE_GROUP:
 2717         case MCAST_LEAVE_GROUP:
 2718         case MCAST_LEAVE_SOURCE_GROUP:
 2719                 error = in6p_leave_group(inp, sopt);
 2720                 break;
 2721 
 2722         case MCAST_BLOCK_SOURCE:
 2723         case MCAST_UNBLOCK_SOURCE:
 2724                 error = in6p_block_unblock_source(inp, sopt);
 2725                 break;
 2726 
 2727         case IPV6_MSFILTER:
 2728                 error = in6p_set_source_filters(inp, sopt);
 2729                 break;
 2730 
 2731         default:
 2732                 error = EOPNOTSUPP;
 2733                 break;
 2734         }
 2735 
 2736         INP_UNLOCK_ASSERT(inp);
 2737 
 2738         return (error);
 2739 }
 2740 
 2741 /*
 2742  * Expose MLD's multicast filter mode and source list(s) to userland,
 2743  * keyed by (ifindex, group).
 2744  * The filter mode is written out as a uint32_t, followed by
 2745  * 0..n of struct in6_addr.
 2746  * For use by ifmcstat(8).
 2747  * SMPng: NOTE: unlocked read of ifindex space.
 2748  */
 2749 static int
 2750 sysctl_ip6_mcast_filters(SYSCTL_HANDLER_ARGS)
 2751 {
 2752         struct in6_addr                  mcaddr;
 2753         struct in6_addr                  src;
 2754         struct epoch_tracker             et;
 2755         struct ifnet                    *ifp;
 2756         struct ifmultiaddr              *ifma;
 2757         struct in6_multi                *inm;
 2758         struct ip6_msource              *ims;
 2759         int                             *name;
 2760         int                              retval;
 2761         u_int                            namelen;
 2762         uint32_t                         fmode, ifindex;
 2763 #ifdef KTR
 2764         char                             ip6tbuf[INET6_ADDRSTRLEN];
 2765 #endif
 2766 
 2767         name = (int *)arg1;
 2768         namelen = arg2;
 2769 
 2770         if (req->newptr != NULL)
 2771                 return (EPERM);
 2772 
 2773         /* int: ifindex + 4 * 32 bits of IPv6 address */
 2774         if (namelen != 5)
 2775                 return (EINVAL);
 2776 
 2777         memcpy(&mcaddr, &name[1], sizeof(struct in6_addr));
 2778         if (!IN6_IS_ADDR_MULTICAST(&mcaddr)) {
 2779                 CTR2(KTR_MLD, "%s: group %s is not multicast",
 2780                     __func__, ip6_sprintf(ip6tbuf, &mcaddr));
 2781                 return (EINVAL);
 2782         }
 2783 
 2784         ifindex = name[0];
 2785         NET_EPOCH_ENTER(et);
 2786         ifp = ifnet_byindex(ifindex);
 2787         if (ifp == NULL) {
 2788                 NET_EPOCH_EXIT(et);
 2789                 CTR2(KTR_MLD, "%s: no ifp for ifindex %u",
 2790                     __func__, ifindex);
 2791                 return (ENOENT);
 2792         }
 2793         /*
 2794          * Internal MLD lookups require that scope/zone ID is set.
 2795          */
 2796         (void)in6_setscope(&mcaddr, ifp, NULL);
 2797 
 2798         retval = sysctl_wire_old_buffer(req,
 2799             sizeof(uint32_t) + (in6_mcast_maxgrpsrc * sizeof(struct in6_addr)));
 2800         if (retval) {
 2801                 NET_EPOCH_EXIT(et);
 2802                 return (retval);
 2803         }
 2804 
 2805         IN6_MULTI_LOCK();
 2806         IN6_MULTI_LIST_LOCK();
 2807         CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
 2808                 inm = in6m_ifmultiaddr_get_inm(ifma);
 2809                 if (inm == NULL)
 2810                         continue;
 2811                 if (!IN6_ARE_ADDR_EQUAL(&inm->in6m_addr, &mcaddr))
 2812                         continue;
 2813                 fmode = inm->in6m_st[1].iss_fmode;
 2814                 retval = SYSCTL_OUT(req, &fmode, sizeof(uint32_t));
 2815                 if (retval != 0)
 2816                         break;
 2817                 RB_FOREACH(ims, ip6_msource_tree, &inm->in6m_srcs) {
 2818                         CTR2(KTR_MLD, "%s: visit node %p", __func__, ims);
 2819                         /*
 2820                          * Only copy-out sources which are in-mode.
 2821                          */
 2822                         if (fmode != im6s_get_mode(inm, ims, 1)) {
 2823                                 CTR1(KTR_MLD, "%s: skip non-in-mode",
 2824                                     __func__);
 2825                                 continue;
 2826                         }
 2827                         src = ims->im6s_addr;
 2828                         retval = SYSCTL_OUT(req, &src,
 2829                             sizeof(struct in6_addr));
 2830                         if (retval != 0)
 2831                                 break;
 2832                 }
 2833         }
 2834         IN6_MULTI_LIST_UNLOCK();
 2835         IN6_MULTI_UNLOCK();
 2836         NET_EPOCH_EXIT(et);
 2837 
 2838         return (retval);
 2839 }
 2840 
 2841 #ifdef KTR
 2842 
 2843 static const char *in6m_modestrs[] = { "un", "in", "ex" };
 2844 
 2845 static const char *
 2846 in6m_mode_str(const int mode)
 2847 {
 2848 
 2849         if (mode >= MCAST_UNDEFINED && mode <= MCAST_EXCLUDE)
 2850                 return (in6m_modestrs[mode]);
 2851         return ("??");
 2852 }
 2853 
 2854 static const char *in6m_statestrs[] = {
 2855         "not-member",
 2856         "silent",
 2857         "reporting",
 2858         "idle",
 2859         "lazy",
 2860         "sleeping",
 2861         "awakening",
 2862         "query-pending",
 2863         "sg-query-pending",
 2864         "leaving"
 2865 };
 2866 _Static_assert(nitems(in6m_statestrs) ==
 2867     MLD_LEAVING_MEMBER - MLD_NOT_MEMBER + 1, "Missing MLD group state");
 2868 
 2869 static const char *
 2870 in6m_state_str(const int state)
 2871 {
 2872 
 2873         if (state >= MLD_NOT_MEMBER && state <= MLD_LEAVING_MEMBER)
 2874                 return (in6m_statestrs[state]);
 2875         return ("??");
 2876 }
 2877 
 2878 /*
 2879  * Dump an in6_multi structure to the console.
 2880  */
 2881 void
 2882 in6m_print(const struct in6_multi *inm)
 2883 {
 2884         int t;
 2885         char ip6tbuf[INET6_ADDRSTRLEN];
 2886 
 2887         if ((ktr_mask & KTR_MLD) == 0)
 2888                 return;
 2889 
 2890         printf("%s: --- begin in6m %p ---\n", __func__, inm);
 2891         printf("addr %s ifp %p(%s) ifma %p\n",
 2892             ip6_sprintf(ip6tbuf, &inm->in6m_addr),
 2893             inm->in6m_ifp,
 2894             if_name(inm->in6m_ifp),
 2895             inm->in6m_ifma);
 2896         printf("timer %u state %s refcount %u scq.len %u\n",
 2897             inm->in6m_timer,
 2898             in6m_state_str(inm->in6m_state),
 2899             inm->in6m_refcount,
 2900             mbufq_len(&inm->in6m_scq));
 2901         printf("mli %p nsrc %lu sctimer %u scrv %u\n",
 2902             inm->in6m_mli,
 2903             inm->in6m_nsrc,
 2904             inm->in6m_sctimer,
 2905             inm->in6m_scrv);
 2906         for (t = 0; t < 2; t++) {
 2907                 printf("t%d: fmode %s asm %u ex %u in %u rec %u\n", t,
 2908                     in6m_mode_str(inm->in6m_st[t].iss_fmode),
 2909                     inm->in6m_st[t].iss_asm,
 2910                     inm->in6m_st[t].iss_ex,
 2911                     inm->in6m_st[t].iss_in,
 2912                     inm->in6m_st[t].iss_rec);
 2913         }
 2914         printf("%s: --- end in6m %p ---\n", __func__, inm);
 2915 }
 2916 
 2917 #else /* !KTR */
 2918 
 2919 void
 2920 in6m_print(const struct in6_multi *inm)
 2921 {
 2922 
 2923 }
 2924 
 2925 #endif /* KTR */

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