[BACK]Return to mld6.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / sys / netinet6

Annotation of src/sys/netinet6/mld6.c, Revision 1.1.2.3

1.1.2.1   itojun      1: /*
                      2:  * Copyright (C) 1998 WIDE Project.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. Neither the name of the project nor the names of its contributors
                     14:  *    may be used to endorse or promote products derived from this software
                     15:  *    without specific prior written permission.
                     16:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     27:  * SUCH DAMAGE.
                     28:  */
                     29:
                     30: /*
                     31:  * Copyright (c) 1988 Stephen Deering.
                     32:  * Copyright (c) 1992, 1993
                     33:  *     The Regents of the University of California.  All rights reserved.
                     34:  *
                     35:  * This code is derived from software contributed to Berkeley by
                     36:  * Stephen Deering of Stanford University.
                     37:  *
                     38:  * Redistribution and use in source and binary forms, with or without
                     39:  * modification, are permitted provided that the following conditions
                     40:  * are met:
                     41:  * 1. Redistributions of source code must retain the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer.
                     43:  * 2. Redistributions in binary form must reproduce the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer in the
                     45:  *    documentation and/or other materials provided with the distribution.
                     46:  * 3. All advertising materials mentioning features or use of this software
                     47:  *    must display the following acknowledgement:
                     48:  *     This product includes software developed by the University of
                     49:  *     California, Berkeley and its contributors.
                     50:  * 4. Neither the name of the University nor the names of its contributors
                     51:  *    may be used to endorse or promote products derived from this software
                     52:  *    without specific prior written permission.
                     53:  *
                     54:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     55:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     56:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     57:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     58:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     59:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     60:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     61:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     62:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     63:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     64:  * SUCH DAMAGE.
                     65:  *
                     66:  *     @(#)igmp.c      8.1 (Berkeley) 7/19/93
                     67:  */
                     68:
                     69: #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
                     70: #include "opt_inet.h"
1.1.2.3 ! itojun     71: #ifdef __NetBSD__      /*XXX*/
        !            72: #include "opt_ipsec.h"
        !            73: #endif
1.1.2.1   itojun     74: #endif
                     75:
                     76: #include <sys/param.h>
                     77: #include <sys/systm.h>
                     78: #include <sys/mbuf.h>
                     79: #include <sys/socket.h>
                     80: #include <sys/protosw.h>
                     81: #include <sys/syslog.h>
                     82:
                     83: #include <net/if.h>
                     84:
                     85: #include <netinet/in.h>
                     86: #include <netinet/in_var.h>
                     87: #include <netinet6/ip6.h>
                     88: #include <netinet6/ip6_var.h>
                     89: #include <netinet6/icmp6.h>
                     90: #include <netinet6/mld6_var.h>
                     91:
1.1.2.3 ! itojun     92: #include <net/net_osdep.h>
        !            93:
1.1.2.1   itojun     94: /*
                     95:  * Protocol constants
                     96:  */
                     97:
                     98: /* denotes that the MLD max response delay field specifies time in milliseconds */
                     99: #define MLD6_TIMER_SCALE       1000
                    100: /*
                    101:  * time between repetitions of a node's initial report of interest in a
                    102:  * multicast address(in seconds)
                    103:  */
                    104: #define MLD6_UNSOLICITED_REPORT_INTERVAL       10
                    105:
                    106: static struct ip6_pktopts ip6_opts;
                    107: static int mld6_timers_are_running;
                    108: /* XXX: These are necessary for KAME's link-local hack */
                    109: static struct in6_addr mld6_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
                    110: static struct in6_addr mld6_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
                    111:
                    112: static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *));
                    113:
                    114: void
                    115: mld6_init()
                    116: {
                    117:        static u_int8_t hbh_buf[8];
                    118:        struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
                    119:        u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
                    120:
                    121:        mld6_timers_are_running = 0;
                    122:
                    123:        /* ip6h_nxt will be fill in later */
                    124:        hbh->ip6h_len = 0;      /* (8 >> 3) - 1*/
                    125:
                    126:        /* XXX: grotty hard coding... */
                    127:        hbh_buf[2] = IP6OPT_PADN;       /* 2 byte padding */
                    128:        hbh_buf[3] = 0;
                    129:        hbh_buf[4] = IP6OPT_RTALERT;
                    130:        hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
                    131:        bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
                    132:
                    133:        ip6_opts.ip6po_hbh = hbh;
                    134:        /* We will specify the hoplimit by a multicast option. */
                    135:        ip6_opts.ip6po_hlim = -1;
                    136: }
                    137:
                    138: void
                    139: mld6_start_listening(in6m)
                    140:        struct in6_multi *in6m;
                    141: {
1.1.2.3 ! itojun    142: #ifdef __NetBSD__
1.1.2.2   itojun    143:        int s = splsoftnet();
1.1.2.3 ! itojun    144: #else
        !           145:        int s = splnet();
        !           146: #endif
1.1.2.1   itojun    147:
                    148:        /*
                    149:         * (draft-ietf-ipngwg-mld, page 10)
                    150:         * The node never sends a Report or Done for the link-scope all-nodes
                    151:         * address.
                    152:         * MLD messages are never sent for multicast addresses whose scope is 0
                    153:         * (reserved) or 1 (node-local).
                    154:         */
                    155:        mld6_all_nodes_linklocal.s6_addr16[1] =
                    156:                htons(in6m->in6m_ifp->if_index); /* XXX */
                    157:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) ||
                    158:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
                    159:                in6m->in6m_timer = 0;
                    160:                in6m->in6m_state = MLD6_OTHERLISTENER;
                    161:        } else {
                    162:                mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL);
                    163:                in6m->in6m_timer = MLD6_RANDOM_DELAY(
                    164:                        MLD6_UNSOLICITED_REPORT_INTERVAL * PR_FASTHZ);
                    165:                in6m->in6m_state = MLD6_IREPORTEDLAST;
                    166:                mld6_timers_are_running = 1;
                    167:        }
                    168:        splx(s);
                    169: }
                    170:
                    171: void
                    172: mld6_stop_listening(in6m)
                    173:        struct in6_multi *in6m;
                    174: {
                    175:        mld6_all_nodes_linklocal.s6_addr16[1] =
                    176:                htons(in6m->in6m_ifp->if_index); /* XXX */
                    177:        mld6_all_routers_linklocal.s6_addr16[1] =
                    178:                htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */
                    179:
                    180:        if (in6m->in6m_state == MLD6_IREPORTEDLAST &&
                    181:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal)) &&
                    182:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL)
                    183:                mld6_sendpkt(in6m, MLD6_LISTENER_DONE,
                    184:                             &mld6_all_routers_linklocal);
                    185: }
                    186:
                    187: void
                    188: mld6_input(m, off)
                    189:        struct mbuf *m;
                    190:        int off;
                    191: {
                    192:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                    193:        struct mld6_hdr *mldh = (struct mld6_hdr *)(mtod(m, caddr_t) + off);
                    194:        struct ifnet *ifp = m->m_pkthdr.rcvif;
                    195:        struct in6_multi *in6m;
                    196:        struct in6_ifaddr *ia;
1.1.2.3 ! itojun    197: #if defined(__FreeBSD__) && __FreeBSD__ >= 3
        !           198:        struct ifmultiaddr *ifma;
        !           199: #endif
1.1.2.1   itojun    200:        int timer;              /* timer value in the MLD query header */
                    201:
                    202:        /* source address validation */
                    203:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
                    204:                log(LOG_ERR,
                    205:                    "mld6_input: src %s is not link-local\n",
                    206:                    ip6_sprintf(&ip6->ip6_src));
                    207:                /*
                    208:                 * spec(draft-ietf-ipngwg-mld) does not explicitly
                    209:                 * specify to discard the packet from a non link-local
                    210:                 * source address. But we believe it's expected to do so.
                    211:                 */
                    212:                return;
                    213:        }
                    214:
                    215:        /*
                    216:         * In the MLD6 specification, there are 3 states and a flag.
                    217:         *
                    218:         * In Non-Listener state, we simply don't have a membership record.
                    219:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
                    220:         * In Idle Listener state, our timer is not running (in6m->in6m_timer==0)
                    221:         *
                    222:         * The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if
                    223:         * we have heard a report from another member, or MLD6_IREPORTEDLAST
                    224:         * if we sent the last report.
                    225:         */
                    226:        switch(mldh->mld6_type) {
1.1.2.3 ! itojun    227:        case MLD6_LISTENER_QUERY:
        !           228:                if (ifp->if_flags & IFF_LOOPBACK)
        !           229:                        break;
        !           230:
        !           231:                if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) &&
        !           232:                !IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr))
        !           233:                        break;  /* print error or log stat? */
        !           234:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
        !           235:                        mldh->mld6_addr.s6_addr16[1] =
        !           236:                                htons(ifp->if_index); /* XXX */
1.1.2.1   itojun    237:
                    238:                /*
1.1.2.3 ! itojun    239:                * - Start the timers in all of our membership records
        !           240:                *   that the query applies to for the interface on
        !           241:                *   which the query arrived excl. those that belong
        !           242:                *   to the "all-nodes" group (ff02::1).
        !           243:                * - Restart any timer that is already running but has
        !           244:                *   A value longer than the requested timeout.
        !           245:                * - Use the value specified in the query message as
        !           246:                *   the maximum timeout.
        !           247:                */
        !           248:                IFP_TO_IA6(ifp, ia);
        !           249:                if (ia == NULL)
        !           250:                        break;
1.1.2.1   itojun    251:
                    252:                /*
1.1.2.3 ! itojun    253:                * XXX: System timer resolution is too low to handle Max
        !           254:                * Response Delay, so set 1 to the internal timer even if
        !           255:                * the calculated value equals to zero when Max Response
        !           256:                * Delay is positive.
        !           257:                */
        !           258:                timer = ntohs(mldh->mld6_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE;
        !           259:                if (timer == 0 && mldh->mld6_maxdelay)
        !           260:                        timer = 1;
        !           261:                mld6_all_nodes_linklocal.s6_addr16[1] =
        !           262:                        htons(ifp->if_index); /* XXX */
        !           263:
        !           264: #if defined(__FreeBSD__) && __FreeBSD__ >= 3
        !           265:                LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
        !           266: #else
        !           267:                for (in6m = ia->ia6_multiaddrs.lh_first;
        !           268:                     in6m;
        !           269:                     in6m = in6m->in6m_entry.le_next)
        !           270: #endif
        !           271:                {
        !           272: #if defined(__FreeBSD__) && __FreeBSD__ >= 3
        !           273:                        if (ifma->ifma_addr->sa_family != AF_INET6)
        !           274:                                continue;
        !           275:                        in6m = (struct in6_multi *)ifma->ifma_protospec;
        !           276:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
        !           277:                                        &mld6_all_nodes_linklocal) ||
        !           278:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
        !           279:                            IPV6_ADDR_SCOPE_LINKLOCAL)
        !           280:                                continue;
        !           281: #else
        !           282:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr,
        !           283:                                                &mld6_all_nodes_linklocal) ||
        !           284:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
        !           285:                            IPV6_ADDR_SCOPE_LINKLOCAL)
        !           286:                                continue;
        !           287: #endif
1.1.2.1   itojun    288:
1.1.2.3 ! itojun    289:                        if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) ||
        !           290:                            IN6_ARE_ADDR_EQUAL(&mldh->mld6_addr,
        !           291:                                                &in6m->in6m_addr))
        !           292:                        {
        !           293:                                if (timer == 0) {
        !           294:                                        /* send a report immediately */
        !           295:                                        mld6_sendpkt(in6m, MLD6_LISTENER_REPORT,
        !           296:                                                NULL);
        !           297:                                        in6m->in6m_timer = 0; /* reset timer */
        !           298:                                        in6m->in6m_state = MLD6_IREPORTEDLAST;
        !           299:                                }
        !           300:                                else if (in6m->in6m_timer == 0 || /*idle state*/
        !           301:                                        in6m->in6m_timer > timer) {
        !           302:                                        in6m->in6m_timer =
        !           303:                                                MLD6_RANDOM_DELAY(timer);
        !           304:                                        mld6_timers_are_running = 1;
        !           305:                                }
        !           306:                        }
        !           307:                }
1.1.2.1   itojun    308:
1.1.2.3 ! itojun    309:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
        !           310:                        mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
        !           311:                break;
        !           312:        case MLD6_LISTENER_REPORT:
1.1.2.1   itojun    313:                /*
1.1.2.3 ! itojun    314:                * For fast leave to work, we have to know that we are the
        !           315:                * last person to send a report for this group.  Reports
        !           316:                * can potentially get looped back if we are a multicast
        !           317:                * router, so discard reports sourced by me.
        !           318:                * Note that it is impossible to check IFF_LOOPBACK flag of
        !           319:                * ifp for this purpose, since ip6_mloopback pass the physical
        !           320:                * interface to looutput.
        !           321:                */
        !           322:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
        !           323:                        break;
        !           324:
        !           325:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr))
        !           326:                        break;
        !           327:
        !           328:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
        !           329:                        mldh->mld6_addr.s6_addr16[1] =
        !           330:                                htons(ifp->if_index); /* XXX */
        !           331:                /*
        !           332:                * If we belong to the group being reported, stop
        !           333:                * our timer for that group.
        !           334:                */
        !           335:                IN6_LOOKUP_MULTI(mldh->mld6_addr, ifp, in6m);
        !           336:                if (in6m) {
        !           337:                        in6m->in6m_timer = 0; /* transit to idle state */
        !           338:                        in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */
        !           339:                }
        !           340:
        !           341:                if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
        !           342:                        mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
        !           343:                break;
        !           344:        default:                /* this is impossible */
        !           345:                log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld6_type);
        !           346:                break;
1.1.2.1   itojun    347:        }
                    348: }
                    349:
                    350: void
                    351: mld6_fasttimeo()
                    352: {
                    353:        register struct in6_multi *in6m;
                    354:        struct in6_multistep step;
                    355:        int s;
                    356:
                    357:        /*
                    358:         * Quick check to see if any work needs to be done, in order
                    359:         * to minimize the overhead of fasttimo processing.
                    360:         */
                    361:        if (!mld6_timers_are_running)
                    362:                return;
                    363:
1.1.2.3 ! itojun    364: #ifdef __NetBSD__
1.1.2.2   itojun    365:        s = splsoftnet();
1.1.2.3 ! itojun    366: #else
        !           367:        s = splnet();
        !           368: #endif
1.1.2.1   itojun    369:        mld6_timers_are_running = 0;
                    370:        IN6_FIRST_MULTI(step, in6m);
                    371:        while (in6m != NULL) {
                    372:                if (in6m->in6m_timer == 0) {
                    373:                        /* do nothing */
                    374:                } else if (--in6m->in6m_timer == 0) {
                    375:                        mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL);
                    376:                        in6m->in6m_state = MLD6_IREPORTEDLAST;
                    377:                } else {
                    378:                        mld6_timers_are_running = 1;
                    379:                }
                    380:                IN6_NEXT_MULTI(step, in6m);
                    381:        }
                    382:        splx(s);
                    383: }
                    384:
                    385: static void
                    386: mld6_sendpkt(in6m, type, dst)
                    387:        struct in6_multi *in6m;
                    388:        int type;
                    389:        const struct in6_addr *dst;
                    390: {
                    391:        struct mbuf *mh, *md;
                    392:        struct mld6_hdr *mldh;
                    393:        struct ip6_hdr *ip6;
                    394:        struct ip6_moptions im6o;
                    395:        struct in6_ifaddr *ia;
                    396:        struct ifnet *ifp = in6m->in6m_ifp;
1.1.2.3 ! itojun    397:        struct ifnet *outif = NULL;
1.1.2.1   itojun    398:
                    399:        /*
                    400:         * At first, find a link local address on the outgoing interface
                    401:         * to use as the source address of the MLD packet.
                    402:         */
                    403:        if ((ia = in6ifa_ifpforlinklocal(ifp)) == NULL)
                    404:                return;
                    405:
                    406:        /*
                    407:         * Allocate mbufs to store ip6 header and MLD header.
                    408:         * We allocate 2 mbufs and make chain in advance because
                    409:         * it is more convenient when inserting the hop-by-hop option later.
                    410:         */
                    411:        MGETHDR(mh, M_DONTWAIT, MT_HEADER);
                    412:        if (mh == NULL)
                    413:                return;
                    414:        MGET(md, M_DONTWAIT, MT_DATA);
                    415:        if (md == NULL) {
                    416:                m_free(mh);
                    417:                return;
                    418:        }
                    419:        mh->m_next = md;
                    420:
                    421: #ifdef IPSEC
1.1.2.3 ! itojun    422: #ifndef __OpenBSD__ /*KAME IPSEC*/
1.1.2.1   itojun    423:        mh->m_pkthdr.rcvif = NULL;
1.1.2.3 ! itojun    424: #endif
1.1.2.1   itojun    425: #endif
                    426:        mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld6_hdr);
                    427:        mh->m_len = sizeof(struct ip6_hdr);
                    428:        MH_ALIGN(mh, sizeof(struct ip6_hdr));
                    429:
                    430:        /* fill in the ip6 header */
                    431:        ip6 = mtod(mh, struct ip6_hdr *);
                    432:        ip6->ip6_flow = 0;
                    433:        ip6->ip6_vfc = IPV6_VERSION;
                    434:        /* ip6_plen will be set later */
                    435:        ip6->ip6_nxt = IPPROTO_ICMPV6;
                    436:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
                    437:        ip6->ip6_src = ia->ia_addr.sin6_addr;
                    438:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
                    439:
                    440:        /* fill in the MLD header */
                    441:        md->m_len = sizeof(struct mld6_hdr);
                    442:        mldh = mtod(md, struct mld6_hdr *);
                    443:        mldh->mld6_type = type;
                    444:        mldh->mld6_code = 0;
                    445:        mldh->mld6_cksum = 0;
                    446:        /* XXX: we assume the function will not be called for query messages */
                    447:        mldh->mld6_maxdelay = 0;
                    448:        mldh->mld6_reserved = 0;
                    449:        mldh->mld6_addr = in6m->in6m_addr;
                    450:        if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr))
                    451:                mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */
                    452:        mldh->mld6_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
                    453:                                     sizeof(struct mld6_hdr));
                    454:
                    455:        /* construct multicast option */
                    456:        bzero(&im6o, sizeof(im6o));
                    457:        im6o.im6o_multicast_ifp = ifp;
                    458:        im6o.im6o_multicast_hlim = 1;
                    459:
                    460:        /*
                    461:         * Request loopback of the report if we are acting as a multicast
                    462:         * router, so that the process-level routing daemon can hear it.
                    463:         */
                    464:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    465:
                    466:        /* increment output statictics */
                    467:        icmp6stat.icp6s_outhist[type]++;
                    468:
1.1.2.3 ! itojun    469:        ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif);
        !           470:        if (outif) {
        !           471:                icmp6_ifstat_inc(outif, ifs6_out_msg);
        !           472:                switch(type) {
        !           473:                 case MLD6_LISTENER_QUERY:
        !           474:                         icmp6_ifstat_inc(outif, ifs6_out_mldquery);
        !           475:                         break;
        !           476:                 case MLD6_LISTENER_REPORT:
        !           477:                         icmp6_ifstat_inc(outif, ifs6_out_mldreport);
        !           478:                         break;
        !           479:                 case MLD6_LISTENER_DONE:
        !           480:                         icmp6_ifstat_inc(outif, ifs6_out_mlddone);
        !           481:                         break;
        !           482:                }
        !           483:        }
1.1.2.1   itojun    484: }

CVSweb <webmaster@jp.NetBSD.org>