mld6.c

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    1 /*      $NetBSD: mld6.c,v 1.26 2004/03/28 08:28:50 christos Exp $       */
    2 /*      $KAME: mld6.c,v 1.25 2001/01/16 14:14:18 itojun Exp $   */
    3 
    4 /*
    5  * Copyright (C) 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * Copyright (c) 1992, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  *
   37  * This code is derived from software contributed to Berkeley by
   38  * Stephen Deering of Stanford University.
   39  *
   40  * Redistribution and use in source and binary forms, with or without
   41  * modification, are permitted provided that the following conditions
   42  * are met:
   43  * 1. Redistributions of source code must retain the above copyright
   44  *    notice, this list of conditions and the following disclaimer.
   45  * 2. Redistributions in binary form must reproduce the above copyright
   46  *    notice, this list of conditions and the following disclaimer in the
   47  *    documentation and/or other materials provided with the distribution.
   48  * 3. Neither the name of the University nor the names of its contributors
   49  *    may be used to endorse or promote products derived from this software
   50  *    without specific prior written permission.
   51  *
   52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   62  * SUCH DAMAGE.
   63  *
   64  *      @(#)igmp.c      8.1 (Berkeley) 7/19/93
   65  */
   66 
   67 /*
   68  * Copyright (c) 1988 Stephen Deering.
   69  *
   70  * This code is derived from software contributed to Berkeley by
   71  * Stephen Deering of Stanford University.
   72  *
   73  * Redistribution and use in source and binary forms, with or without
   74  * modification, are permitted provided that the following conditions
   75  * are met:
   76  * 1. Redistributions of source code must retain the above copyright
   77  *    notice, this list of conditions and the following disclaimer.
   78  * 2. Redistributions in binary form must reproduce the above copyright
   79  *    notice, this list of conditions and the following disclaimer in the
   80  *    documentation and/or other materials provided with the distribution.
   81  * 3. All advertising materials mentioning features or use of this software
   82  *    must display the following acknowledgement:
   83  *      This product includes software developed by the University of
   84  *      California, Berkeley and its contributors.
   85  * 4. Neither the name of the University nor the names of its contributors
   86  *    may be used to endorse or promote products derived from this software
   87  *    without specific prior written permission.
   88  *
   89  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   90  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   91  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   92  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   93  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   94  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   95  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   96  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   97  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   98  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   99  * SUCH DAMAGE.
  100  *
  101  *      @(#)igmp.c      8.1 (Berkeley) 7/19/93
  102  */
  103 
  104 #include <sys/cdefs.h>
  105 __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.26 2004/03/28 08:28:50 christos Exp $");
  106 
  107 #include "opt_inet.h"
  108 
  109 #include <sys/param.h>
  110 #include <sys/systm.h>
  111 #include <sys/mbuf.h>
  112 #include <sys/socket.h>
  113 #include <sys/protosw.h>
  114 #include <sys/syslog.h>
  115 
  116 #include <net/if.h>
  117 
  118 #include <netinet/in.h>
  119 #include <netinet/in_var.h>
  120 #include <netinet/ip6.h>
  121 #include <netinet6/ip6_var.h>
  122 #include <netinet/icmp6.h>
  123 #include <netinet6/mld6_var.h>
  124 
  125 #include <net/net_osdep.h>
  126 
  127 /*
  128  * Protocol constants
  129  */
  130 
  131 /* denotes that the MLD max response delay field specifies time in milliseconds */
  132 #define MLD_TIMER_SCALE 1000
  133 /*
  134  * time between repetitions of a node's initial report of interest in a
  135  * multicast address(in seconds)
  136  */
  137 #define MLD_UNSOLICITED_REPORT_INTERVAL 10
  138 
  139 static struct ip6_pktopts ip6_opts;
  140 static int mld_timers_are_running;
  141 /* XXX: These are necessary for KAME's link-local hack */
  142 static struct in6_addr mld_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
  143 static struct in6_addr mld_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
  144 
  145 static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *));
  146 
  147 void
  148 mld6_init()
  149 {
  150         static u_int8_t hbh_buf[8];
  151         struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
  152         u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
  153 
  154         mld_timers_are_running = 0;
  155 
  156         /* ip6h_nxt will be fill in later */
  157         hbh->ip6h_len = 0;      /* (8 >> 3) - 1 */
  158 
  159         /* XXX: grotty hard coding... */
  160         hbh_buf[2] = IP6OPT_PADN;       /* 2 byte padding */
  161         hbh_buf[3] = 0;
  162         hbh_buf[4] = IP6OPT_RTALERT;
  163         hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
  164         bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
  165 
  166         ip6_opts.ip6po_hbh = hbh;
  167         /* We will specify the hoplimit by a multicast option. */
  168         ip6_opts.ip6po_hlim = -1;
  169 }
  170 
  171 void
  172 mld6_start_listening(in6m)
  173         struct in6_multi *in6m;
  174 {
  175         /*
  176          * RFC2710 page 10:
  177          * The node never sends a Report or Done for the link-scope all-nodes
  178          * address.
  179          * MLD messages are never sent for multicast addresses whose scope is 0
  180          * (reserved) or 1 (node-local).
  181          */
  182         mld_all_nodes_linklocal.s6_addr16[1] =
  183             htons(in6m->in6m_ifp->if_index); /* XXX */
  184         if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld_all_nodes_linklocal) ||
  185             IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
  186                 in6m->in6m_timer = 0;
  187                 in6m->in6m_state = MLD_OTHERLISTENER;
  188         } else {
  189                 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
  190                 in6m->in6m_timer =
  191                     MLD_RANDOM_DELAY(MLD_UNSOLICITED_REPORT_INTERVAL *
  192                     PR_FASTHZ);
  193                 in6m->in6m_state = MLD_IREPORTEDLAST;
  194                 mld_timers_are_running = 1;
  195         }
  196 }
  197 
  198 void
  199 mld6_stop_listening(in6m)
  200         struct in6_multi *in6m;
  201 {
  202         mld_all_nodes_linklocal.s6_addr16[1] =
  203             htons(in6m->in6m_ifp->if_index); /* XXX */
  204         mld_all_routers_linklocal.s6_addr16[1] =
  205             htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */
  206 
  207         if (in6m->in6m_state == MLD_IREPORTEDLAST &&
  208             (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld_all_nodes_linklocal)) &&
  209             IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL)
  210                 mld6_sendpkt(in6m, MLD_LISTENER_DONE,
  211                     &mld_all_routers_linklocal);
  212 }
  213 
  214 void
  215 mld6_input(m, off)
  216         struct mbuf *m;
  217         int off;
  218 {
  219         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  220         struct mld_hdr *mldh;
  221         struct ifnet *ifp = m->m_pkthdr.rcvif;
  222         struct in6_multi *in6m;
  223         struct in6_ifaddr *ia;
  224         int timer;              /* timer value in the MLD query header */
  225 
  226         IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
  227         if (mldh == NULL) {
  228                 icmp6stat.icp6s_tooshort++;
  229                 return;
  230         }
  231 
  232         /* source address validation */
  233         ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
  234         if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
  235 #if 0
  236                 log(LOG_ERR,
  237                     "mld_input: src %s is not link-local (grp=%s)\n",
  238                     ip6_sprintf(&ip6->ip6_src),
  239                     ip6_sprintf(&mldh->mld_addr));
  240 #endif
  241                 /*
  242                  * spec (RFC2710) does not explicitly
  243                  * specify to discard the packet from a non link-local
  244                  * source address. But we believe it's expected to do so.
  245                  * XXX: do we have to allow :: as source?
  246                  */
  247                 m_freem(m);
  248                 return;
  249         }
  250 
  251         /*
  252          * In the MLD6 specification, there are 3 states and a flag.
  253          *
  254          * In Non-Listener state, we simply don't have a membership record.
  255          * In Delaying Listener state, our timer is running (in6m->in6m_timer)
  256          * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
  257          *
  258          * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
  259          * we have heard a report from another member, or MLD_IREPORTEDLAST
  260          * if we sent the last report.
  261          */
  262         switch (mldh->mld_type) {
  263         case MLD_LISTENER_QUERY:
  264                 if (ifp->if_flags & IFF_LOOPBACK)
  265                         break;
  266 
  267                 if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) &&
  268                     !IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
  269                         break;  /* print error or log stat? */
  270                 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
  271                         mldh->mld_addr.s6_addr16[1] =
  272                             htons(ifp->if_index); /* XXX */
  273 
  274                 /*
  275                  * - Start the timers in all of our membership records
  276                  *   that the query applies to for the interface on
  277                  *   which the query arrived excl. those that belong
  278                  *   to the "all-nodes" group (ff02::1).
  279                  * - Restart any timer that is already running but has
  280                  *   A value longer than the requested timeout.
  281                  * - Use the value specified in the query message as
  282                  *   the maximum timeout.
  283                  */
  284                 IFP_TO_IA6(ifp, ia);
  285                 if (ia == NULL)
  286                         break;
  287 
  288                 /*
  289                  * XXX: System timer resolution is too low to handle Max
  290                  * Response Delay, so set 1 to the internal timer even if
  291                  * the calculated value equals to zero when Max Response
  292                  * Delay is positive.
  293                  */
  294                 timer = ntohs(mldh->mld_maxdelay)*PR_FASTHZ/MLD_TIMER_SCALE;
  295                 if (timer == 0 && mldh->mld_maxdelay)
  296                         timer = 1;
  297                 mld_all_nodes_linklocal.s6_addr16[1] =
  298                         htons(ifp->if_index); /* XXX */
  299 
  300                 for (in6m = ia->ia6_multiaddrs.lh_first;
  301                      in6m;
  302                      in6m = in6m->in6m_entry.le_next)
  303                 {
  304                         if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
  305                                                 &mld_all_nodes_linklocal) ||
  306                             IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
  307                             IPV6_ADDR_SCOPE_LINKLOCAL)
  308                                 continue;
  309 
  310                         if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) ||
  311                             IN6_ARE_ADDR_EQUAL(&mldh->mld_addr,
  312                                                 &in6m->in6m_addr))
  313                         {
  314                                 if (timer == 0) {
  315                                         /* send a report immediately */
  316                                         mld6_sendpkt(in6m, MLD_LISTENER_REPORT,
  317                                             NULL);
  318                                         in6m->in6m_timer = 0; /* reset timer */
  319                                         in6m->in6m_state = MLD_IREPORTEDLAST;
  320                                 }
  321                                 else if (in6m->in6m_timer == 0 || /*idle state*/
  322                                     in6m->in6m_timer > timer) {
  323                                         in6m->in6m_timer =
  324                                             MLD_RANDOM_DELAY(timer);
  325                                         mld_timers_are_running = 1;
  326                                 }
  327                         }
  328                 }
  329 
  330                 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
  331                         mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
  332                 break;
  333         case MLD_LISTENER_REPORT:
  334                 /*
  335                  * For fast leave to work, we have to know that we are the
  336                  * last person to send a report for this group.  Reports
  337                  * can potentially get looped back if we are a multicast
  338                  * router, so discard reports sourced by me.
  339                  * Note that it is impossible to check IFF_LOOPBACK flag of
  340                  * ifp for this purpose, since ip6_mloopback pass the physical
  341                  * interface to looutput.
  342                  */
  343                 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
  344                         break;
  345 
  346                 if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
  347                         break;
  348 
  349                 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
  350                         mldh->mld_addr.s6_addr16[1] =
  351                                 htons(ifp->if_index); /* XXX */
  352                 /*
  353                  * If we belong to the group being reported, stop
  354                  * our timer for that group.
  355                  */
  356                 IN6_LOOKUP_MULTI(mldh->mld_addr, ifp, in6m);
  357                 if (in6m) {
  358                         in6m->in6m_timer = 0; /* transit to idle state */
  359                         in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
  360                 }
  361 
  362                 if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
  363                         mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
  364                 break;
  365         default:                /* this is impossible */
  366 #if 0
  367                 /*
  368                  * this case should be impossible because of filtering in
  369                  * icmp6_input().  But we explicitly disabled this part
  370                  * just in case.
  371                  */
  372                 log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld6_type);
  373 #endif
  374                 break;
  375         }
  376 
  377         m_freem(m);
  378 }
  379 
  380 void
  381 mld6_fasttimeo()
  382 {
  383         struct in6_multi *in6m;
  384         struct in6_multistep step;
  385         int s;
  386         /*
  387          * Quick check to see if any work needs to be done, in order
  388          * to minimize the overhead of fasttimo processing.
  389          */
  390         if (!mld_timers_are_running)
  391                 return;
  392 
  393         s = splsoftnet();
  394         mld_timers_are_running = 0;
  395         IN6_FIRST_MULTI(step, in6m);
  396         while (in6m != NULL) {
  397                 if (in6m->in6m_timer == 0) {
  398                         /* do nothing */
  399                 } else if (--in6m->in6m_timer == 0) {
  400                         mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
  401                         in6m->in6m_state = MLD_IREPORTEDLAST;
  402                 } else {
  403                         mld_timers_are_running = 1;
  404                 }
  405                 IN6_NEXT_MULTI(step, in6m);
  406         }
  407         splx(s);
  408 }
  409 
  410 static void
  411 mld6_sendpkt(in6m, type, dst)
  412         struct in6_multi *in6m;
  413         int type;
  414         const struct in6_addr *dst;
  415 {
  416         struct mbuf *mh, *md;
  417         struct mld_hdr *mldh;
  418         struct ip6_hdr *ip6;
  419         struct ip6_moptions im6o;
  420         struct in6_ifaddr *ia;
  421         struct ifnet *ifp = in6m->in6m_ifp;
  422         int ignflags;
  423 
  424         /*
  425          * At first, find a link local address on the outgoing interface
  426          * to use as the source address of the MLD packet.
  427          * We do not reject tentative addresses for MLD report to deal with
  428          * the case where we first join a link-local address.
  429          */
  430         ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
  431         if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
  432                 return;
  433         if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
  434                 ia = NULL;
  435 
  436         /*
  437          * Allocate mbufs to store ip6 header and MLD header.
  438          * We allocate 2 mbufs and make chain in advance because
  439          * it is more convenient when inserting the hop-by-hop option later.
  440          */
  441         MGETHDR(mh, M_DONTWAIT, MT_HEADER);
  442         if (mh == NULL)
  443                 return;
  444         MGET(md, M_DONTWAIT, MT_DATA);
  445         if (md == NULL) {
  446                 m_free(mh);
  447                 return;
  448         }
  449         mh->m_next = md;
  450 
  451         mh->m_pkthdr.rcvif = NULL;
  452         mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
  453         mh->m_len = sizeof(struct ip6_hdr);
  454         MH_ALIGN(mh, sizeof(struct ip6_hdr));
  455 
  456         /* fill in the ip6 header */
  457         ip6 = mtod(mh, struct ip6_hdr *);
  458         ip6->ip6_flow = 0;
  459         ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
  460         ip6->ip6_vfc |= IPV6_VERSION;
  461         /* ip6_plen will be set later */
  462         ip6->ip6_nxt = IPPROTO_ICMPV6;
  463         /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
  464         ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
  465         ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
  466 
  467         /* fill in the MLD header */
  468         md->m_len = sizeof(struct mld_hdr);
  469         mldh = mtod(md, struct mld_hdr *);
  470         mldh->mld_type = type;
  471         mldh->mld_code = 0;
  472         mldh->mld_cksum = 0;
  473         /* XXX: we assume the function will not be called for query messages */
  474         mldh->mld_maxdelay = 0;
  475         mldh->mld_reserved = 0;
  476         mldh->mld_addr = in6m->in6m_addr;
  477         if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
  478                 mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
  479         mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
  480             sizeof(struct mld_hdr));
  481 
  482         /* construct multicast option */
  483         bzero(&im6o, sizeof(im6o));
  484         im6o.im6o_multicast_ifp = ifp;
  485         im6o.im6o_multicast_hlim = 1;
  486 
  487         /*
  488          * Request loopback of the report if we are acting as a multicast
  489          * router, so that the process-level routing daemon can hear it.
  490          */
  491         im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
  492 
  493         /* increment output statictics */
  494         icmp6stat.icp6s_outhist[type]++;
  495         icmp6_ifstat_inc(ifp, ifs6_out_msg);
  496         switch (type) {
  497         case MLD_LISTENER_QUERY:
  498                 icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
  499                 break;
  500         case MLD_LISTENER_REPORT:
  501                 icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
  502                 break;
  503         case MLD_LISTENER_DONE:
  504                 icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
  505                 break;
  506         }
  507 
  508         ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC, 
  509             &im6o, (struct socket *)NULL, NULL);
  510 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/mld6.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/mld6.c
