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Annotation of src/sys/netinet6/mld6.c, Revision 1.22

1.22    ! itojun      1: /*     $NetBSD: mld6.c,v 1.21 2003/05/14 06:47:43 itojun Exp $ */
1.13      itojun      2: /*     $KAME: mld6.c,v 1.25 2001/01/16 14:14:18 itojun Exp $   */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1998 WIDE Project.
                      6:  * All rights reserved.
1.13      itojun      7:  *
1.2       itojun      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.
1.13      itojun     19:  *
1.2       itojun     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) 1988 Stephen Deering.
                     35:  * Copyright (c) 1992, 1993
                     36:  *     The Regents of the University of California.  All rights reserved.
                     37:  *
                     38:  * This code is derived from software contributed to Berkeley by
                     39:  * Stephen Deering of Stanford University.
                     40:  *
                     41:  * Redistribution and use in source and binary forms, with or without
                     42:  * modification, are permitted provided that the following conditions
                     43:  * are met:
                     44:  * 1. Redistributions of source code must retain the above copyright
                     45:  *    notice, this list of conditions and the following disclaimer.
                     46:  * 2. Redistributions in binary form must reproduce the above copyright
                     47:  *    notice, this list of conditions and the following disclaimer in the
                     48:  *    documentation and/or other materials provided with the distribution.
                     49:  * 3. All advertising materials mentioning features or use of this software
                     50:  *    must display the following acknowledgement:
                     51:  *     This product includes software developed by the University of
                     52:  *     California, Berkeley and its contributors.
                     53:  * 4. Neither the name of the University nor the names of its contributors
                     54:  *    may be used to endorse or promote products derived from this software
                     55:  *    without specific prior written permission.
                     56:  *
                     57:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     58:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     59:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     60:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     61:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     62:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     63:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     64:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     65:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     66:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     67:  * SUCH DAMAGE.
                     68:  *
                     69:  *     @(#)igmp.c      8.1 (Berkeley) 7/19/93
                     70:  */
1.16      lukem      71:
                     72: #include <sys/cdefs.h>
1.22    ! itojun     73: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.21 2003/05/14 06:47:43 itojun Exp $");
1.2       itojun     74:
                     75: #include "opt_inet.h"
                     76:
                     77: #include <sys/param.h>
                     78: #include <sys/systm.h>
                     79: #include <sys/mbuf.h>
                     80: #include <sys/socket.h>
                     81: #include <sys/protosw.h>
                     82: #include <sys/syslog.h>
                     83:
                     84: #include <net/if.h>
                     85:
                     86: #include <netinet/in.h>
                     87: #include <netinet/in_var.h>
1.10      itojun     88: #include <netinet/ip6.h>
1.2       itojun     89: #include <netinet6/ip6_var.h>
1.10      itojun     90: #include <netinet/icmp6.h>
1.2       itojun     91: #include <netinet6/mld6_var.h>
                     92:
1.7       itojun     93: #include <net/net_osdep.h>
                     94:
1.2       itojun     95: /*
                     96:  * Protocol constants
                     97:  */
                     98:
                     99: /* denotes that the MLD max response delay field specifies time in milliseconds */
1.22    ! itojun    100: #define MLD_TIMER_SCALE        1000
1.2       itojun    101: /*
                    102:  * time between repetitions of a node's initial report of interest in a
                    103:  * multicast address(in seconds)
                    104:  */
1.22    ! itojun    105: #define MLD_UNSOLICITED_REPORT_INTERVAL        10
1.2       itojun    106:
                    107: static struct ip6_pktopts ip6_opts;
1.22    ! itojun    108: static int mld_timers_are_running;
1.2       itojun    109: /* XXX: These are necessary for KAME's link-local hack */
1.22    ! itojun    110: static struct in6_addr mld_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
        !           111: static struct in6_addr mld_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1.2       itojun    112:
                    113: static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *));
                    114:
                    115: void
                    116: mld6_init()
                    117: {
                    118:        static u_int8_t hbh_buf[8];
                    119:        struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
                    120:        u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
                    121:
1.22    ! itojun    122:        mld_timers_are_running = 0;
1.2       itojun    123:
                    124:        /* ip6h_nxt will be fill in later */
1.11      itojun    125:        hbh->ip6h_len = 0;      /* (8 >> 3) - 1 */
1.2       itojun    126:
                    127:        /* XXX: grotty hard coding... */
                    128:        hbh_buf[2] = IP6OPT_PADN;       /* 2 byte padding */
                    129:        hbh_buf[3] = 0;
                    130:        hbh_buf[4] = IP6OPT_RTALERT;
                    131:        hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
                    132:        bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
                    133:
                    134:        ip6_opts.ip6po_hbh = hbh;
                    135:        /* We will specify the hoplimit by a multicast option. */
                    136:        ip6_opts.ip6po_hlim = -1;
                    137: }
                    138:
                    139: void
                    140: mld6_start_listening(in6m)
                    141:        struct in6_multi *in6m;
                    142: {
1.4       itojun    143:        int s = splsoftnet();
1.2       itojun    144:
                    145:        /*
1.11      itojun    146:         * RFC2710 page 10:
1.2       itojun    147:         * The node never sends a Report or Done for the link-scope all-nodes
                    148:         * address.
                    149:         * MLD messages are never sent for multicast addresses whose scope is 0
                    150:         * (reserved) or 1 (node-local).
                    151:         */
1.22    ! itojun    152:        mld_all_nodes_linklocal.s6_addr16[1] =
1.19      itojun    153:            htons(in6m->in6m_ifp->if_index); /* XXX */
1.22    ! itojun    154:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld_all_nodes_linklocal) ||
1.2       itojun    155:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
                    156:                in6m->in6m_timer = 0;
1.22    ! itojun    157:                in6m->in6m_state = MLD_OTHERLISTENER;
1.2       itojun    158:        } else {
1.22    ! itojun    159:                mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
1.19      itojun    160:                in6m->in6m_timer =
1.22    ! itojun    161:                    MLD_RANDOM_DELAY(MLD_UNSOLICITED_REPORT_INTERVAL *
1.19      itojun    162:                    PR_FASTHZ);
1.22    ! itojun    163:                in6m->in6m_state = MLD_IREPORTEDLAST;
        !           164:                mld_timers_are_running = 1;
1.2       itojun    165:        }
                    166:        splx(s);
                    167: }
                    168:
                    169: void
                    170: mld6_stop_listening(in6m)
                    171:        struct in6_multi *in6m;
                    172: {
1.22    ! itojun    173:        mld_all_nodes_linklocal.s6_addr16[1] =
1.19      itojun    174:            htons(in6m->in6m_ifp->if_index); /* XXX */
1.22    ! itojun    175:        mld_all_routers_linklocal.s6_addr16[1] =
1.19      itojun    176:            htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */
1.2       itojun    177:
1.22    ! itojun    178:        if (in6m->in6m_state == MLD_IREPORTEDLAST &&
        !           179:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld_all_nodes_linklocal)) &&
1.2       itojun    180:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL)
1.22    ! itojun    181:                mld6_sendpkt(in6m, MLD_LISTENER_DONE,
        !           182:                    &mld_all_routers_linklocal);
1.2       itojun    183: }
                    184:
                    185: void
                    186: mld6_input(m, off)
                    187:        struct mbuf *m;
                    188:        int off;
                    189: {
                    190:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.22    ! itojun    191:        struct mld_hdr *mldh;
1.2       itojun    192:        struct ifnet *ifp = m->m_pkthdr.rcvif;
                    193:        struct in6_multi *in6m;
                    194:        struct in6_ifaddr *ia;
                    195:        int timer;              /* timer value in the MLD query header */
                    196:
1.22    ! itojun    197:        IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
1.13      itojun    198:        if (mldh == NULL) {
                    199:                icmp6stat.icp6s_tooshort++;
                    200:                return;
                    201:        }
                    202:
1.2       itojun    203:        /* source address validation */
1.13      itojun    204:        ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2       itojun    205:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.18      itojun    206: #if 0
1.2       itojun    207:                log(LOG_ERR,
1.22    ! itojun    208:                    "mld_input: src %s is not link-local (grp=%s)\n",
1.13      itojun    209:                    ip6_sprintf(&ip6->ip6_src),
1.22    ! itojun    210:                    ip6_sprintf(&mldh->mld_addr));
1.18      itojun    211: #endif
1.2       itojun    212:                /*
1.11      itojun    213:                 * spec (RFC2710) does not explicitly
1.2       itojun    214:                 * specify to discard the packet from a non link-local
                    215:                 * source address. But we believe it's expected to do so.
1.13      itojun    216:                 * XXX: do we have to allow :: as source?
1.2       itojun    217:                 */
1.11      itojun    218:                m_freem(m);
1.2       itojun    219:                return;
                    220:        }
                    221:
                    222:        /*
                    223:         * In the MLD6 specification, there are 3 states and a flag.
                    224:         *
                    225:         * In Non-Listener state, we simply don't have a membership record.
                    226:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
                    227:         * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
                    228:         *
1.22    ! itojun    229:         * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
        !           230:         * we have heard a report from another member, or MLD_IREPORTEDLAST
1.2       itojun    231:         * if we sent the last report.
                    232:         */
1.22    ! itojun    233:        switch (mldh->mld_type) {
        !           234:        case MLD_LISTENER_QUERY:
1.7       itojun    235:                if (ifp->if_flags & IFF_LOOPBACK)
                    236:                        break;
                    237:
1.22    ! itojun    238:                if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) &&
        !           239:                    !IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7       itojun    240:                        break;  /* print error or log stat? */
1.22    ! itojun    241:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
        !           242:                        mldh->mld_addr.s6_addr16[1] =
1.19      itojun    243:                            htons(ifp->if_index); /* XXX */
1.2       itojun    244:
1.7       itojun    245:                /*
1.11      itojun    246:                 * - Start the timers in all of our membership records
                    247:                 *   that the query applies to for the interface on
                    248:                 *   which the query arrived excl. those that belong
                    249:                 *   to the "all-nodes" group (ff02::1).
                    250:                 * - Restart any timer that is already running but has
                    251:                 *   A value longer than the requested timeout.
                    252:                 * - Use the value specified in the query message as
                    253:                 *   the maximum timeout.
                    254:                 */
1.7       itojun    255:                IFP_TO_IA6(ifp, ia);
                    256:                if (ia == NULL)
                    257:                        break;
1.2       itojun    258:
                    259:                /*
1.11      itojun    260:                 * XXX: System timer resolution is too low to handle Max
                    261:                 * Response Delay, so set 1 to the internal timer even if
                    262:                 * the calculated value equals to zero when Max Response
                    263:                 * Delay is positive.
                    264:                 */
1.22    ! itojun    265:                timer = ntohs(mldh->mld_maxdelay)*PR_FASTHZ/MLD_TIMER_SCALE;
        !           266:                if (timer == 0 && mldh->mld_maxdelay)
1.7       itojun    267:                        timer = 1;
1.22    ! itojun    268:                mld_all_nodes_linklocal.s6_addr16[1] =
1.7       itojun    269:                        htons(ifp->if_index); /* XXX */
1.20      itojun    270:
1.7       itojun    271:                for (in6m = ia->ia6_multiaddrs.lh_first;
                    272:                     in6m;
                    273:                     in6m = in6m->in6m_entry.le_next)
                    274:                {
                    275:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
1.22    ! itojun    276:                                                &mld_all_nodes_linklocal) ||
1.7       itojun    277:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
                    278:                            IPV6_ADDR_SCOPE_LINKLOCAL)
                    279:                                continue;
1.2       itojun    280:
1.22    ! itojun    281:                        if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld_addr) ||
        !           282:                            IN6_ARE_ADDR_EQUAL(&mldh->mld_addr,
1.7       itojun    283:                                                &in6m->in6m_addr))
                    284:                        {
                    285:                                if (timer == 0) {
                    286:                                        /* send a report immediately */
1.22    ! itojun    287:                                        mld6_sendpkt(in6m, MLD_LISTENER_REPORT,
1.19      itojun    288:                                            NULL);
1.7       itojun    289:                                        in6m->in6m_timer = 0; /* reset timer */
1.22    ! itojun    290:                                        in6m->in6m_state = MLD_IREPORTEDLAST;
1.7       itojun    291:                                }
                    292:                                else if (in6m->in6m_timer == 0 || /*idle state*/
1.19      itojun    293:                                    in6m->in6m_timer > timer) {
1.7       itojun    294:                                        in6m->in6m_timer =
1.22    ! itojun    295:                                            MLD_RANDOM_DELAY(timer);
        !           296:                                        mld_timers_are_running = 1;
1.7       itojun    297:                                }
                    298:                        }
                    299:                }
1.2       itojun    300:
1.22    ! itojun    301:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
        !           302:                        mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
1.7       itojun    303:                break;
1.22    ! itojun    304:        case MLD_LISTENER_REPORT:
1.2       itojun    305:                /*
1.11      itojun    306:                 * For fast leave to work, we have to know that we are the
                    307:                 * last person to send a report for this group.  Reports
                    308:                 * can potentially get looped back if we are a multicast
                    309:                 * router, so discard reports sourced by me.
                    310:                 * Note that it is impossible to check IFF_LOOPBACK flag of
                    311:                 * ifp for this purpose, since ip6_mloopback pass the physical
                    312:                 * interface to looutput.
                    313:                 */
1.7       itojun    314:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
                    315:                        break;
                    316:
1.22    ! itojun    317:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7       itojun    318:                        break;
                    319:
1.22    ! itojun    320:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
        !           321:                        mldh->mld_addr.s6_addr16[1] =
1.7       itojun    322:                                htons(ifp->if_index); /* XXX */
                    323:                /*
1.11      itojun    324:                 * If we belong to the group being reported, stop
                    325:                 * our timer for that group.
                    326:                 */
1.22    ! itojun    327:                IN6_LOOKUP_MULTI(mldh->mld_addr, ifp, in6m);
1.7       itojun    328:                if (in6m) {
                    329:                        in6m->in6m_timer = 0; /* transit to idle state */
1.22    ! itojun    330:                        in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7       itojun    331:                }
                    332:
1.22    ! itojun    333:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
        !           334:                        mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
1.7       itojun    335:                break;
                    336:        default:                /* this is impossible */
1.18      itojun    337: #if 0
1.19      itojun    338:                /*
                    339:                 * this case should be impossible because of filtering in
                    340:                 * icmp6_input().  But we explicitly disabled this part
                    341:                 * just in case.
                    342:                 */
1.22    ! itojun    343:                log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld6_type);
1.18      itojun    344: #endif
1.7       itojun    345:                break;
1.2       itojun    346:        }
1.11      itojun    347:
                    348:        m_freem(m);
1.2       itojun    349: }
                    350:
                    351: void
                    352: mld6_fasttimeo()
                    353: {
1.13      itojun    354:        struct in6_multi *in6m;
1.2       itojun    355:        struct in6_multistep step;
                    356:        int s;
                    357:        /*
                    358:         * Quick check to see if any work needs to be done, in order
                    359:         * to minimize the overhead of fasttimo processing.
                    360:         */
1.22    ! itojun    361:        if (!mld_timers_are_running)
1.2       itojun    362:                return;
                    363:
1.4       itojun    364:        s = splsoftnet();
1.22    ! itojun    365:        mld_timers_are_running = 0;
1.2       itojun    366:        IN6_FIRST_MULTI(step, in6m);
                    367:        while (in6m != NULL) {
                    368:                if (in6m->in6m_timer == 0) {
                    369:                        /* do nothing */
                    370:                } else if (--in6m->in6m_timer == 0) {
1.22    ! itojun    371:                        mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
        !           372:                        in6m->in6m_state = MLD_IREPORTEDLAST;
1.2       itojun    373:                } else {
1.22    ! itojun    374:                        mld_timers_are_running = 1;
1.2       itojun    375:                }
                    376:                IN6_NEXT_MULTI(step, in6m);
                    377:        }
                    378:        splx(s);
                    379: }
                    380:
                    381: static void
                    382: mld6_sendpkt(in6m, type, dst)
                    383:        struct in6_multi *in6m;
                    384:        int type;
                    385:        const struct in6_addr *dst;
                    386: {
                    387:        struct mbuf *mh, *md;
1.22    ! itojun    388:        struct mld_hdr *mldh;
1.2       itojun    389:        struct ip6_hdr *ip6;
                    390:        struct ip6_moptions im6o;
                    391:        struct in6_ifaddr *ia;
                    392:        struct ifnet *ifp = in6m->in6m_ifp;
1.19      itojun    393:        int ignflags;
1.2       itojun    394:
                    395:        /*
                    396:         * At first, find a link local address on the outgoing interface
                    397:         * to use as the source address of the MLD packet.
1.19      itojun    398:         * We do not reject tentative addresses for MLD report to deal with
                    399:         * the case where we first join a link-local address.
1.2       itojun    400:         */
1.19      itojun    401:        ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
                    402:        if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
1.2       itojun    403:                return;
1.19      itojun    404:        if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
                    405:                ia = NULL;
1.2       itojun    406:
                    407:        /*
                    408:         * Allocate mbufs to store ip6 header and MLD header.
                    409:         * We allocate 2 mbufs and make chain in advance because
                    410:         * it is more convenient when inserting the hop-by-hop option later.
                    411:         */
                    412:        MGETHDR(mh, M_DONTWAIT, MT_HEADER);
                    413:        if (mh == NULL)
                    414:                return;
                    415:        MGET(md, M_DONTWAIT, MT_DATA);
                    416:        if (md == NULL) {
                    417:                m_free(mh);
                    418:                return;
                    419:        }
                    420:        mh->m_next = md;
                    421:
1.19      itojun    422:        mh->m_pkthdr.rcvif = NULL;
1.22    ! itojun    423:        mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr);
1.2       itojun    424:        mh->m_len = sizeof(struct ip6_hdr);
                    425:        MH_ALIGN(mh, sizeof(struct ip6_hdr));
                    426:
                    427:        /* fill in the ip6 header */
                    428:        ip6 = mtod(mh, struct ip6_hdr *);
                    429:        ip6->ip6_flow = 0;
1.8       itojun    430:        ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
                    431:        ip6->ip6_vfc |= IPV6_VERSION;
1.2       itojun    432:        /* ip6_plen will be set later */
                    433:        ip6->ip6_nxt = IPPROTO_ICMPV6;
                    434:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
1.19      itojun    435:        ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
1.2       itojun    436:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
                    437:
                    438:        /* fill in the MLD header */
1.22    ! itojun    439:        md->m_len = sizeof(struct mld_hdr);
        !           440:        mldh = mtod(md, struct mld_hdr *);
        !           441:        mldh->mld_type = type;
        !           442:        mldh->mld_code = 0;
        !           443:        mldh->mld_cksum = 0;
1.2       itojun    444:        /* XXX: we assume the function will not be called for query messages */
1.22    ! itojun    445:        mldh->mld_maxdelay = 0;
        !           446:        mldh->mld_reserved = 0;
        !           447:        mldh->mld_addr = in6m->in6m_addr;
        !           448:        if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld_addr))
        !           449:                mldh->mld_addr.s6_addr16[1] = 0; /* XXX */
        !           450:        mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
        !           451:            sizeof(struct mld_hdr));
1.2       itojun    452:
                    453:        /* construct multicast option */
                    454:        bzero(&im6o, sizeof(im6o));
                    455:        im6o.im6o_multicast_ifp = ifp;
                    456:        im6o.im6o_multicast_hlim = 1;
                    457:
                    458:        /*
                    459:         * Request loopback of the report if we are acting as a multicast
                    460:         * router, so that the process-level routing daemon can hear it.
                    461:         */
                    462:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    463:
                    464:        /* increment output statictics */
                    465:        icmp6stat.icp6s_outhist[type]++;
1.15      itojun    466:        icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17      itojun    467:        switch (type) {
1.22    ! itojun    468:        case MLD_LISTENER_QUERY:
1.15      itojun    469:                icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
                    470:                break;
1.22    ! itojun    471:        case MLD_LISTENER_REPORT:
1.15      itojun    472:                icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
                    473:                break;
1.22    ! itojun    474:        case MLD_LISTENER_DONE:
1.15      itojun    475:                icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
                    476:                break;
1.7       itojun    477:        }
1.19      itojun    478:
                    479:        ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC, &im6o, NULL);
1.2       itojun    480: }

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