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Annotation of src/sys/netinet6/mld6.c, Revision 1.13.2.6

1.13.2.6! nathanw     1: /*     $NetBSD: mld6.c,v 1.13.2.5 2002/02/28 04:15:14 nathanw 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:  */
1.13.2.2  nathanw    71:
                     72: #include <sys/cdefs.h>
1.13.2.6! nathanw    73: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.13.2.5 2002/02/28 04:15:14 nathanw 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 */
                    100: #define MLD6_TIMER_SCALE       1000
                    101: /*
                    102:  * time between repetitions of a node's initial report of interest in a
                    103:  * multicast address(in seconds)
                    104:  */
                    105: #define MLD6_UNSOLICITED_REPORT_INTERVAL       10
                    106:
                    107: static struct ip6_pktopts ip6_opts;
                    108: static int mld6_timers_are_running;
                    109: /* XXX: These are necessary for KAME's link-local hack */
                    110: static struct in6_addr mld6_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
                    111: static struct in6_addr mld6_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
                    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:
                    122:        mld6_timers_are_running = 0;
                    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:         */
                    152:        mld6_all_nodes_linklocal.s6_addr16[1] =
1.13.2.6! nathanw   153:            htons(in6m->in6m_ifp->if_index); /* XXX */
1.2       itojun    154:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) ||
                    155:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
                    156:                in6m->in6m_timer = 0;
                    157:                in6m->in6m_state = MLD6_OTHERLISTENER;
                    158:        } else {
                    159:                mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL);
1.13.2.6! nathanw   160:                in6m->in6m_timer =
        !           161:                    MLD6_RANDOM_DELAY(MLD6_UNSOLICITED_REPORT_INTERVAL *
        !           162:                    PR_FASTHZ);
1.2       itojun    163:                in6m->in6m_state = MLD6_IREPORTEDLAST;
                    164:                mld6_timers_are_running = 1;
                    165:        }
                    166:        splx(s);
                    167: }
                    168:
                    169: void
                    170: mld6_stop_listening(in6m)
                    171:        struct in6_multi *in6m;
                    172: {
                    173:        mld6_all_nodes_linklocal.s6_addr16[1] =
1.13.2.6! nathanw   174:            htons(in6m->in6m_ifp->if_index); /* XXX */
1.2       itojun    175:        mld6_all_routers_linklocal.s6_addr16[1] =
1.13.2.6! nathanw   176:            htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */
1.2       itojun    177:
                    178:        if (in6m->in6m_state == MLD6_IREPORTEDLAST &&
                    179:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal)) &&
                    180:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL)
                    181:                mld6_sendpkt(in6m, MLD6_LISTENER_DONE,
1.13.2.6! nathanw   182:                    &mld6_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 *);
1.11      itojun    191:        struct mld6_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:
1.13      itojun    197: #ifndef PULLDOWN_TEST
                    198:        IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),);
                    199:        mldh = (struct mld6_hdr *)(mtod(m, caddr_t) + off);
                    200: #else
                    201:        IP6_EXTHDR_GET(mldh, struct mld6_hdr *, m, off, sizeof(*mldh));
                    202:        if (mldh == NULL) {
                    203:                icmp6stat.icp6s_tooshort++;
                    204:                return;
                    205:        }
                    206: #endif
                    207:
1.2       itojun    208:        /* source address validation */
1.13      itojun    209:        ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2       itojun    210:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.13.2.4  nathanw   211: #if 0
1.2       itojun    212:                log(LOG_ERR,
1.13      itojun    213:                    "mld6_input: src %s is not link-local (grp=%s)\n",
                    214:                    ip6_sprintf(&ip6->ip6_src),
                    215:                    ip6_sprintf(&mldh->mld6_addr));
1.13.2.4  nathanw   216: #endif
1.2       itojun    217:                /*
1.11      itojun    218:                 * spec (RFC2710) does not explicitly
1.2       itojun    219:                 * specify to discard the packet from a non link-local
                    220:                 * source address. But we believe it's expected to do so.
1.13      itojun    221:                 * XXX: do we have to allow :: as source?
1.2       itojun    222:                 */
1.11      itojun    223:                m_freem(m);
1.2       itojun    224:                return;
                    225:        }
                    226:
                    227:        /*
                    228:         * In the MLD6 specification, there are 3 states and a flag.
                    229:         *
                    230:         * In Non-Listener state, we simply don't have a membership record.
                    231:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
                    232:         * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
                    233:         *
                    234:         * The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if
                    235:         * we have heard a report from another member, or MLD6_IREPORTEDLAST
                    236:         * if we sent the last report.
                    237:         */
1.13.2.3  nathanw   238:        switch (mldh->mld6_type) {
1.7       itojun    239:        case MLD6_LISTENER_QUERY:
                    240:                if (ifp->if_flags & IFF_LOOPBACK)
                    241:                        break;
                    242:
                    243:                if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) &&
1.13      itojun    244:                    !IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr))
1.7       itojun    245:                        break;  /* print error or log stat? */
                    246:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
                    247:                        mldh->mld6_addr.s6_addr16[1] =
1.13.2.6! nathanw   248:                            htons(ifp->if_index); /* XXX */
1.2       itojun    249:
1.7       itojun    250:                /*
1.11      itojun    251:                 * - Start the timers in all of our membership records
                    252:                 *   that the query applies to for the interface on
                    253:                 *   which the query arrived excl. those that belong
                    254:                 *   to the "all-nodes" group (ff02::1).
                    255:                 * - Restart any timer that is already running but has
                    256:                 *   A value longer than the requested timeout.
                    257:                 * - Use the value specified in the query message as
                    258:                 *   the maximum timeout.
                    259:                 */
1.7       itojun    260:                IFP_TO_IA6(ifp, ia);
                    261:                if (ia == NULL)
                    262:                        break;
1.2       itojun    263:
                    264:                /*
1.11      itojun    265:                 * XXX: System timer resolution is too low to handle Max
                    266:                 * Response Delay, so set 1 to the internal timer even if
                    267:                 * the calculated value equals to zero when Max Response
                    268:                 * Delay is positive.
                    269:                 */
1.7       itojun    270:                timer = ntohs(mldh->mld6_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE;
                    271:                if (timer == 0 && mldh->mld6_maxdelay)
                    272:                        timer = 1;
                    273:                mld6_all_nodes_linklocal.s6_addr16[1] =
                    274:                        htons(ifp->if_index); /* XXX */
1.13.2.6! nathanw   275:
1.7       itojun    276:                for (in6m = ia->ia6_multiaddrs.lh_first;
                    277:                     in6m;
                    278:                     in6m = in6m->in6m_entry.le_next)
                    279:                {
                    280:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
1.2       itojun    281:                                                &mld6_all_nodes_linklocal) ||
1.7       itojun    282:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
                    283:                            IPV6_ADDR_SCOPE_LINKLOCAL)
                    284:                                continue;
1.2       itojun    285:
1.7       itojun    286:                        if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) ||
                    287:                            IN6_ARE_ADDR_EQUAL(&mldh->mld6_addr,
                    288:                                                &in6m->in6m_addr))
                    289:                        {
                    290:                                if (timer == 0) {
                    291:                                        /* send a report immediately */
                    292:                                        mld6_sendpkt(in6m, MLD6_LISTENER_REPORT,
1.13.2.6! nathanw   293:                                            NULL);
1.7       itojun    294:                                        in6m->in6m_timer = 0; /* reset timer */
                    295:                                        in6m->in6m_state = MLD6_IREPORTEDLAST;
                    296:                                }
                    297:                                else if (in6m->in6m_timer == 0 || /*idle state*/
1.13.2.6! nathanw   298:                                    in6m->in6m_timer > timer) {
1.7       itojun    299:                                        in6m->in6m_timer =
1.13.2.6! nathanw   300:                                            MLD6_RANDOM_DELAY(timer);
1.7       itojun    301:                                        mld6_timers_are_running = 1;
                    302:                                }
                    303:                        }
                    304:                }
1.2       itojun    305:
1.7       itojun    306:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
                    307:                        mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
                    308:                break;
                    309:        case MLD6_LISTENER_REPORT:
1.2       itojun    310:                /*
1.11      itojun    311:                 * For fast leave to work, we have to know that we are the
                    312:                 * last person to send a report for this group.  Reports
                    313:                 * can potentially get looped back if we are a multicast
                    314:                 * router, so discard reports sourced by me.
                    315:                 * Note that it is impossible to check IFF_LOOPBACK flag of
                    316:                 * ifp for this purpose, since ip6_mloopback pass the physical
                    317:                 * interface to looutput.
                    318:                 */
1.7       itojun    319:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
                    320:                        break;
                    321:
                    322:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr))
                    323:                        break;
                    324:
                    325:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
                    326:                        mldh->mld6_addr.s6_addr16[1] =
                    327:                                htons(ifp->if_index); /* XXX */
                    328:                /*
1.11      itojun    329:                 * If we belong to the group being reported, stop
                    330:                 * our timer for that group.
                    331:                 */
1.7       itojun    332:                IN6_LOOKUP_MULTI(mldh->mld6_addr, ifp, in6m);
                    333:                if (in6m) {
                    334:                        in6m->in6m_timer = 0; /* transit to idle state */
                    335:                        in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */
                    336:                }
                    337:
                    338:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
                    339:                        mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
                    340:                break;
                    341:        default:                /* this is impossible */
1.13.2.4  nathanw   342: #if 0
1.13.2.6! nathanw   343:                /*
        !           344:                 * this case should be impossible because of filtering in
        !           345:                 * icmp6_input().  But we explicitly disabled this part
        !           346:                 * just in case.
        !           347:                 */
1.7       itojun    348:                log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld6_type);
1.13.2.4  nathanw   349: #endif
1.7       itojun    350:                break;
1.2       itojun    351:        }
1.11      itojun    352:
                    353:        m_freem(m);
1.2       itojun    354: }
                    355:
                    356: void
                    357: mld6_fasttimeo()
                    358: {
1.13      itojun    359:        struct in6_multi *in6m;
1.2       itojun    360:        struct in6_multistep step;
                    361:        int s;
                    362:        /*
                    363:         * Quick check to see if any work needs to be done, in order
                    364:         * to minimize the overhead of fasttimo processing.
                    365:         */
                    366:        if (!mld6_timers_are_running)
                    367:                return;
                    368:
1.4       itojun    369:        s = splsoftnet();
1.2       itojun    370:        mld6_timers_are_running = 0;
                    371:        IN6_FIRST_MULTI(step, in6m);
                    372:        while (in6m != NULL) {
                    373:                if (in6m->in6m_timer == 0) {
                    374:                        /* do nothing */
                    375:                } else if (--in6m->in6m_timer == 0) {
                    376:                        mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL);
                    377:                        in6m->in6m_state = MLD6_IREPORTEDLAST;
                    378:                } else {
                    379:                        mld6_timers_are_running = 1;
                    380:                }
                    381:                IN6_NEXT_MULTI(step, in6m);
                    382:        }
                    383:        splx(s);
                    384: }
                    385:
                    386: static void
                    387: mld6_sendpkt(in6m, type, dst)
                    388:        struct in6_multi *in6m;
                    389:        int type;
                    390:        const struct in6_addr *dst;
                    391: {
                    392:        struct mbuf *mh, *md;
                    393:        struct mld6_hdr *mldh;
                    394:        struct ip6_hdr *ip6;
                    395:        struct ip6_moptions im6o;
                    396:        struct in6_ifaddr *ia;
                    397:        struct ifnet *ifp = in6m->in6m_ifp;
1.13.2.6! nathanw   398:        int ignflags;
1.2       itojun    399:
                    400:        /*
                    401:         * At first, find a link local address on the outgoing interface
                    402:         * to use as the source address of the MLD packet.
1.13.2.6! nathanw   403:         * We do not reject tentative addresses for MLD report to deal with
        !           404:         * the case where we first join a link-local address.
1.2       itojun    405:         */
1.13.2.6! nathanw   406:        ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
        !           407:        if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
1.2       itojun    408:                return;
1.13.2.6! nathanw   409:        if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
        !           410:                ia = NULL;
1.2       itojun    411:
                    412:        /*
                    413:         * Allocate mbufs to store ip6 header and MLD header.
                    414:         * We allocate 2 mbufs and make chain in advance because
                    415:         * it is more convenient when inserting the hop-by-hop option later.
                    416:         */
                    417:        MGETHDR(mh, M_DONTWAIT, MT_HEADER);
                    418:        if (mh == NULL)
                    419:                return;
                    420:        MGET(md, M_DONTWAIT, MT_DATA);
                    421:        if (md == NULL) {
                    422:                m_free(mh);
                    423:                return;
                    424:        }
                    425:        mh->m_next = md;
                    426:
1.13.2.6! nathanw   427:        mh->m_pkthdr.rcvif = NULL;
1.2       itojun    428:        mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld6_hdr);
                    429:        mh->m_len = sizeof(struct ip6_hdr);
                    430:        MH_ALIGN(mh, sizeof(struct ip6_hdr));
                    431:
                    432:        /* fill in the ip6 header */
                    433:        ip6 = mtod(mh, struct ip6_hdr *);
                    434:        ip6->ip6_flow = 0;
1.8       itojun    435:        ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
                    436:        ip6->ip6_vfc |= IPV6_VERSION;
1.2       itojun    437:        /* ip6_plen will be set later */
                    438:        ip6->ip6_nxt = IPPROTO_ICMPV6;
                    439:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
1.13.2.6! nathanw   440:        ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
1.2       itojun    441:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
                    442:
                    443:        /* fill in the MLD header */
                    444:        md->m_len = sizeof(struct mld6_hdr);
                    445:        mldh = mtod(md, struct mld6_hdr *);
                    446:        mldh->mld6_type = type;
                    447:        mldh->mld6_code = 0;
                    448:        mldh->mld6_cksum = 0;
                    449:        /* XXX: we assume the function will not be called for query messages */
                    450:        mldh->mld6_maxdelay = 0;
                    451:        mldh->mld6_reserved = 0;
                    452:        mldh->mld6_addr = in6m->in6m_addr;
                    453:        if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
                    454:                mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
1.13.2.1  nathanw   455:        mldh->mld6_cksum = in6_cksum(mh, IPPROTO_ICMPV6,
                    456:                                     sizeof(struct ip6_hdr),
1.13.2.6! nathanw   457:            sizeof(struct mld6_hdr));
1.2       itojun    458:
                    459:        /* construct multicast option */
                    460:        bzero(&im6o, sizeof(im6o));
                    461:        im6o.im6o_multicast_ifp = ifp;
                    462:        im6o.im6o_multicast_hlim = 1;
                    463:
                    464:        /*
                    465:         * Request loopback of the report if we are acting as a multicast
                    466:         * router, so that the process-level routing daemon can hear it.
                    467:         */
                    468:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    469:
                    470:        /* increment output statictics */
                    471:        icmp6stat.icp6s_outhist[type]++;
1.13.2.1  nathanw   472:        icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.13.2.3  nathanw   473:        switch (type) {
1.13.2.1  nathanw   474:        case MLD6_LISTENER_QUERY:
                    475:                icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
                    476:                break;
                    477:        case MLD6_LISTENER_REPORT:
                    478:                icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
                    479:                break;
                    480:        case MLD6_LISTENER_DONE:
                    481:                icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
                    482:                break;
1.7       itojun    483:        }
1.13.2.6! nathanw   484:
        !           485:        ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC, &im6o, NULL);
1.2       itojun    486: }

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