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Annotation of src/sys/netinet6/mld6.c, Revision 1.6.8.1

1.6.8.1 ! wrstuden    1: /*     $NetBSD: mld6.c,v 1.8 1999/12/15 06:28:44 itojun Exp $  */
1.3       thorpej     2:
1.2       itojun      3: /*
                      4:  * Copyright (C) 1998 WIDE Project.
                      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. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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:  * Copyright (c) 1988 Stephen Deering.
                     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. All advertising materials mentioning features or use of this software
                     49:  *    must display the following acknowledgement:
                     50:  *     This product includes software developed by the University of
                     51:  *     California, Berkeley and its contributors.
                     52:  * 4. Neither the name of the University nor the names of its contributors
                     53:  *    may be used to endorse or promote products derived from this software
                     54:  *    without specific prior written permission.
                     55:  *
                     56:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     57:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     58:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     59:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     60:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     61:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     62:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     63:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     64:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     65:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     66:  * SUCH DAMAGE.
                     67:  *
                     68:  *     @(#)igmp.c      8.1 (Berkeley) 7/19/93
                     69:  */
                     70:
                     71: #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
                     72: #include "opt_inet.h"
1.6       itojun     73: #ifdef __NetBSD__      /*XXX*/
1.5       thorpej    74: #include "opt_ipsec.h"
1.6       itojun     75: #endif
1.2       itojun     76: #endif
                     77:
                     78: #include <sys/param.h>
                     79: #include <sys/systm.h>
                     80: #include <sys/mbuf.h>
                     81: #include <sys/socket.h>
                     82: #include <sys/protosw.h>
                     83: #include <sys/syslog.h>
                     84:
                     85: #include <net/if.h>
                     86:
                     87: #include <netinet/in.h>
                     88: #include <netinet/in_var.h>
                     89: #include <netinet6/ip6.h>
                     90: #include <netinet6/ip6_var.h>
                     91: #include <netinet6/icmp6.h>
                     92: #include <netinet6/mld6_var.h>
                     93:
1.6.8.1 ! wrstuden   94: #include <net/net_osdep.h>
        !            95:
1.2       itojun     96: /*
                     97:  * Protocol constants
                     98:  */
                     99:
                    100: /* denotes that the MLD max response delay field specifies time in milliseconds */
                    101: #define MLD6_TIMER_SCALE       1000
                    102: /*
                    103:  * time between repetitions of a node's initial report of interest in a
                    104:  * multicast address(in seconds)
                    105:  */
                    106: #define MLD6_UNSOLICITED_REPORT_INTERVAL       10
                    107:
                    108: static struct ip6_pktopts ip6_opts;
                    109: static int mld6_timers_are_running;
                    110: /* XXX: These are necessary for KAME's link-local hack */
                    111: static struct in6_addr mld6_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
                    112: static struct in6_addr mld6_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
                    113:
                    114: static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *));
                    115:
                    116: void
                    117: mld6_init()
                    118: {
                    119:        static u_int8_t hbh_buf[8];
                    120:        struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
                    121:        u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
                    122:
                    123:        mld6_timers_are_running = 0;
                    124:
                    125:        /* ip6h_nxt will be fill in later */
                    126:        hbh->ip6h_len = 0;      /* (8 >> 3) - 1*/
                    127:
                    128:        /* XXX: grotty hard coding... */
                    129:        hbh_buf[2] = IP6OPT_PADN;       /* 2 byte padding */
                    130:        hbh_buf[3] = 0;
                    131:        hbh_buf[4] = IP6OPT_RTALERT;
                    132:        hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
                    133:        bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
                    134:
                    135:        ip6_opts.ip6po_hbh = hbh;
                    136:        /* We will specify the hoplimit by a multicast option. */
                    137:        ip6_opts.ip6po_hlim = -1;
                    138: }
                    139:
                    140: void
                    141: mld6_start_listening(in6m)
                    142:        struct in6_multi *in6m;
                    143: {
1.6.8.1 ! wrstuden  144: #ifdef __NetBSD__
1.4       itojun    145:        int s = splsoftnet();
1.6.8.1 ! wrstuden  146: #else
        !           147:        int s = splnet();
        !           148: #endif
1.2       itojun    149:
                    150:        /*
                    151:         * (draft-ietf-ipngwg-mld, page 10)
                    152:         * The node never sends a Report or Done for the link-scope all-nodes
                    153:         * address.
                    154:         * MLD messages are never sent for multicast addresses whose scope is 0
                    155:         * (reserved) or 1 (node-local).
                    156:         */
                    157:        mld6_all_nodes_linklocal.s6_addr16[1] =
                    158:                htons(in6m->in6m_ifp->if_index); /* XXX */
                    159:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) ||
                    160:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
                    161:                in6m->in6m_timer = 0;
                    162:                in6m->in6m_state = MLD6_OTHERLISTENER;
                    163:        } else {
                    164:                mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL);
                    165:                in6m->in6m_timer = MLD6_RANDOM_DELAY(
                    166:                        MLD6_UNSOLICITED_REPORT_INTERVAL * PR_FASTHZ);
                    167:                in6m->in6m_state = MLD6_IREPORTEDLAST;
                    168:                mld6_timers_are_running = 1;
                    169:        }
                    170:        splx(s);
                    171: }
                    172:
                    173: void
                    174: mld6_stop_listening(in6m)
                    175:        struct in6_multi *in6m;
                    176: {
                    177:        mld6_all_nodes_linklocal.s6_addr16[1] =
                    178:                htons(in6m->in6m_ifp->if_index); /* XXX */
                    179:        mld6_all_routers_linklocal.s6_addr16[1] =
                    180:                htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */
                    181:
                    182:        if (in6m->in6m_state == MLD6_IREPORTEDLAST &&
                    183:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal)) &&
                    184:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL)
                    185:                mld6_sendpkt(in6m, MLD6_LISTENER_DONE,
                    186:                             &mld6_all_routers_linklocal);
                    187: }
                    188:
                    189: void
                    190: mld6_input(m, off)
                    191:        struct mbuf *m;
                    192:        int off;
                    193: {
                    194:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                    195:        struct mld6_hdr *mldh = (struct mld6_hdr *)(mtod(m, caddr_t) + off);
                    196:        struct ifnet *ifp = m->m_pkthdr.rcvif;
                    197:        struct in6_multi *in6m;
                    198:        struct in6_ifaddr *ia;
1.6.8.1 ! wrstuden  199: #if defined(__FreeBSD__) && __FreeBSD__ >= 3
        !           200:        struct ifmultiaddr *ifma;
        !           201: #endif
1.2       itojun    202:        int timer;              /* timer value in the MLD query header */
                    203:
                    204:        /* source address validation */
                    205:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
                    206:                log(LOG_ERR,
                    207:                    "mld6_input: src %s is not link-local\n",
                    208:                    ip6_sprintf(&ip6->ip6_src));
                    209:                /*
                    210:                 * spec(draft-ietf-ipngwg-mld) does not explicitly
                    211:                 * specify to discard the packet from a non link-local
                    212:                 * source address. But we believe it's expected to do so.
                    213:                 */
                    214:                return;
                    215:        }
                    216:
                    217:        /*
                    218:         * In the MLD6 specification, there are 3 states and a flag.
                    219:         *
                    220:         * In Non-Listener state, we simply don't have a membership record.
                    221:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
                    222:         * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
                    223:         *
                    224:         * The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if
                    225:         * we have heard a report from another member, or MLD6_IREPORTEDLAST
                    226:         * if we sent the last report.
                    227:         */
                    228:        switch(mldh->mld6_type) {
1.6.8.1 ! wrstuden  229:        case MLD6_LISTENER_QUERY:
        !           230:                if (ifp->if_flags & IFF_LOOPBACK)
        !           231:                        break;
        !           232:
        !           233:                if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) &&
        !           234:                !IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr))
        !           235:                        break;  /* print error or log stat? */
        !           236:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
        !           237:                        mldh->mld6_addr.s6_addr16[1] =
        !           238:                                htons(ifp->if_index); /* XXX */
1.2       itojun    239:
                    240:                /*
1.6.8.1 ! wrstuden  241:                * - Start the timers in all of our membership records
        !           242:                *   that the query applies to for the interface on
        !           243:                *   which the query arrived excl. those that belong
        !           244:                *   to the "all-nodes" group (ff02::1).
        !           245:                * - Restart any timer that is already running but has
        !           246:                *   A value longer than the requested timeout.
        !           247:                * - Use the value specified in the query message as
        !           248:                *   the maximum timeout.
        !           249:                */
        !           250:                IFP_TO_IA6(ifp, ia);
        !           251:                if (ia == NULL)
        !           252:                        break;
1.2       itojun    253:
                    254:                /*
1.6.8.1 ! wrstuden  255:                * XXX: System timer resolution is too low to handle Max
        !           256:                * Response Delay, so set 1 to the internal timer even if
        !           257:                * the calculated value equals to zero when Max Response
        !           258:                * Delay is positive.
        !           259:                */
        !           260:                timer = ntohs(mldh->mld6_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE;
        !           261:                if (timer == 0 && mldh->mld6_maxdelay)
        !           262:                        timer = 1;
        !           263:                mld6_all_nodes_linklocal.s6_addr16[1] =
        !           264:                        htons(ifp->if_index); /* XXX */
        !           265:
        !           266: #if defined(__FreeBSD__) && __FreeBSD__ >= 3
        !           267:                LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
        !           268: #else
        !           269:                for (in6m = ia->ia6_multiaddrs.lh_first;
        !           270:                     in6m;
        !           271:                     in6m = in6m->in6m_entry.le_next)
        !           272: #endif
        !           273:                {
        !           274: #if defined(__FreeBSD__) && __FreeBSD__ >= 3
        !           275:                        if (ifma->ifma_addr->sa_family != AF_INET6)
        !           276:                                continue;
        !           277:                        in6m = (struct in6_multi *)ifma->ifma_protospec;
        !           278:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
        !           279:                                        &mld6_all_nodes_linklocal) ||
        !           280:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
        !           281:                            IPV6_ADDR_SCOPE_LINKLOCAL)
        !           282:                                continue;
        !           283: #else
        !           284:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
        !           285:                                                &mld6_all_nodes_linklocal) ||
        !           286:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
        !           287:                            IPV6_ADDR_SCOPE_LINKLOCAL)
        !           288:                                continue;
        !           289: #endif
1.2       itojun    290:
1.6.8.1 ! wrstuden  291:                        if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) ||
        !           292:                            IN6_ARE_ADDR_EQUAL(&mldh->mld6_addr,
        !           293:                                                &in6m->in6m_addr))
        !           294:                        {
        !           295:                                if (timer == 0) {
        !           296:                                        /* send a report immediately */
        !           297:                                        mld6_sendpkt(in6m, MLD6_LISTENER_REPORT,
        !           298:                                                NULL);
        !           299:                                        in6m->in6m_timer = 0; /* reset timer */
        !           300:                                        in6m->in6m_state = MLD6_IREPORTEDLAST;
        !           301:                                }
        !           302:                                else if (in6m->in6m_timer == 0 || /*idle state*/
        !           303:                                        in6m->in6m_timer > timer) {
        !           304:                                        in6m->in6m_timer =
        !           305:                                                MLD6_RANDOM_DELAY(timer);
        !           306:                                        mld6_timers_are_running = 1;
        !           307:                                }
        !           308:                        }
        !           309:                }
1.2       itojun    310:
1.6.8.1 ! wrstuden  311:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
        !           312:                        mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
        !           313:                break;
        !           314:        case MLD6_LISTENER_REPORT:
1.2       itojun    315:                /*
1.6.8.1 ! wrstuden  316:                * For fast leave to work, we have to know that we are the
        !           317:                * last person to send a report for this group.  Reports
        !           318:                * can potentially get looped back if we are a multicast
        !           319:                * router, so discard reports sourced by me.
        !           320:                * Note that it is impossible to check IFF_LOOPBACK flag of
        !           321:                * ifp for this purpose, since ip6_mloopback pass the physical
        !           322:                * interface to looutput.
        !           323:                */
        !           324:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
        !           325:                        break;
        !           326:
        !           327:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr))
        !           328:                        break;
        !           329:
        !           330:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
        !           331:                        mldh->mld6_addr.s6_addr16[1] =
        !           332:                                htons(ifp->if_index); /* XXX */
        !           333:                /*
        !           334:                * If we belong to the group being reported, stop
        !           335:                * our timer for that group.
        !           336:                */
        !           337:                IN6_LOOKUP_MULTI(mldh->mld6_addr, ifp, in6m);
        !           338:                if (in6m) {
        !           339:                        in6m->in6m_timer = 0; /* transit to idle state */
        !           340:                        in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */
        !           341:                }
        !           342:
        !           343:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
        !           344:                        mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
        !           345:                break;
        !           346:        default:                /* this is impossible */
        !           347:                log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld6_type);
        !           348:                break;
1.2       itojun    349:        }
                    350: }
                    351:
                    352: void
                    353: mld6_fasttimeo()
                    354: {
                    355:        register struct in6_multi *in6m;
                    356:        struct in6_multistep step;
                    357:        int s;
                    358:
                    359:        /*
                    360:         * Quick check to see if any work needs to be done, in order
                    361:         * to minimize the overhead of fasttimo processing.
                    362:         */
                    363:        if (!mld6_timers_are_running)
                    364:                return;
                    365:
1.6.8.1 ! wrstuden  366: #ifdef __NetBSD__
1.4       itojun    367:        s = splsoftnet();
1.6.8.1 ! wrstuden  368: #else
        !           369:        s = splnet();
        !           370: #endif
1.2       itojun    371:        mld6_timers_are_running = 0;
                    372:        IN6_FIRST_MULTI(step, in6m);
                    373:        while (in6m != NULL) {
                    374:                if (in6m->in6m_timer == 0) {
                    375:                        /* do nothing */
                    376:                } else if (--in6m->in6m_timer == 0) {
                    377:                        mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL);
                    378:                        in6m->in6m_state = MLD6_IREPORTEDLAST;
                    379:                } else {
                    380:                        mld6_timers_are_running = 1;
                    381:                }
                    382:                IN6_NEXT_MULTI(step, in6m);
                    383:        }
                    384:        splx(s);
                    385: }
                    386:
                    387: static void
                    388: mld6_sendpkt(in6m, type, dst)
                    389:        struct in6_multi *in6m;
                    390:        int type;
                    391:        const struct in6_addr *dst;
                    392: {
                    393:        struct mbuf *mh, *md;
                    394:        struct mld6_hdr *mldh;
                    395:        struct ip6_hdr *ip6;
                    396:        struct ip6_moptions im6o;
                    397:        struct in6_ifaddr *ia;
                    398:        struct ifnet *ifp = in6m->in6m_ifp;
1.6.8.1 ! wrstuden  399:        struct ifnet *outif = NULL;
1.2       itojun    400:
                    401:        /*
                    402:         * At first, find a link local address on the outgoing interface
                    403:         * to use as the source address of the MLD packet.
                    404:         */
                    405:        if ((ia = in6ifa_ifpforlinklocal(ifp)) == NULL)
                    406:                return;
                    407:
                    408:        /*
                    409:         * Allocate mbufs to store ip6 header and MLD header.
                    410:         * We allocate 2 mbufs and make chain in advance because
                    411:         * it is more convenient when inserting the hop-by-hop option later.
                    412:         */
                    413:        MGETHDR(mh, M_DONTWAIT, MT_HEADER);
                    414:        if (mh == NULL)
                    415:                return;
                    416:        MGET(md, M_DONTWAIT, MT_DATA);
                    417:        if (md == NULL) {
                    418:                m_free(mh);
                    419:                return;
                    420:        }
                    421:        mh->m_next = md;
                    422:
                    423: #ifdef IPSEC
1.6.8.1 ! wrstuden  424: #ifndef __OpenBSD__ /*KAME IPSEC*/
1.2       itojun    425:        mh->m_pkthdr.rcvif = NULL;
1.6.8.1 ! wrstuden  426: #endif
1.2       itojun    427: #endif
                    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;
1.6.8.1 ! wrstuden  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 */
                    440:        ip6->ip6_src = ia->ia_addr.sin6_addr;
                    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 */
                    455:        mldh->mld6_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
                    456:                                     sizeof(struct mld6_hdr));
                    457:
                    458:        /* construct multicast option */
                    459:        bzero(&im6o, sizeof(im6o));
                    460:        im6o.im6o_multicast_ifp = ifp;
                    461:        im6o.im6o_multicast_hlim = 1;
                    462:
                    463:        /*
                    464:         * Request loopback of the report if we are acting as a multicast
                    465:         * router, so that the process-level routing daemon can hear it.
                    466:         */
                    467:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    468:
                    469:        /* increment output statictics */
                    470:        icmp6stat.icp6s_outhist[type]++;
                    471:
1.6.8.1 ! wrstuden  472:        ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif);
        !           473:        if (outif) {
        !           474:                icmp6_ifstat_inc(outif, ifs6_out_msg);
        !           475:                switch(type) {
        !           476:                 case MLD6_LISTENER_QUERY:
        !           477:                         icmp6_ifstat_inc(outif, ifs6_out_mldquery);
        !           478:                         break;
        !           479:                 case MLD6_LISTENER_REPORT:
        !           480:                         icmp6_ifstat_inc(outif, ifs6_out_mldreport);
        !           481:                         break;
        !           482:                 case MLD6_LISTENER_DONE:
        !           483:                         icmp6_ifstat_inc(outif, ifs6_out_mlddone);
        !           484:                         break;
        !           485:                }
        !           486:        }
1.2       itojun    487: }

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