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Annotation of src/sys/netinet6/mld6.c, Revision 1.45.2.2

1.45.2.2! yamt        1: /*     $NetBSD: mld6.c,v 1.45.2.1 2009/05/04 08:14:19 yamt 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) 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.
1.23      agc        48:  * 3. Neither the name of the University nor the names of its contributors
                     49:  *    may be used to endorse or promote products derived from this software
                     50:  *    without specific prior written permission.
                     51:  *
                     52:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     53:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     54:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     55:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     56:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     57:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     58:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     59:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     60:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     61:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     62:  * SUCH DAMAGE.
                     63:  *
                     64:  *     @(#)igmp.c      8.1 (Berkeley) 7/19/93
                     65:  */
                     66:
                     67: /*
                     68:  * Copyright (c) 1988 Stephen Deering.
                     69:  *
                     70:  * This code is derived from software contributed to Berkeley by
                     71:  * Stephen Deering of Stanford University.
                     72:  *
                     73:  * Redistribution and use in source and binary forms, with or without
                     74:  * modification, are permitted provided that the following conditions
                     75:  * are met:
                     76:  * 1. Redistributions of source code must retain the above copyright
                     77:  *    notice, this list of conditions and the following disclaimer.
                     78:  * 2. Redistributions in binary form must reproduce the above copyright
                     79:  *    notice, this list of conditions and the following disclaimer in the
                     80:  *    documentation and/or other materials provided with the distribution.
1.2       itojun     81:  * 3. All advertising materials mentioning features or use of this software
                     82:  *    must display the following acknowledgement:
                     83:  *     This product includes software developed by the University of
                     84:  *     California, Berkeley and its contributors.
                     85:  * 4. Neither the name of the University nor the names of its contributors
                     86:  *    may be used to endorse or promote products derived from this software
                     87:  *    without specific prior written permission.
                     88:  *
                     89:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     90:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     91:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     92:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     93:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     94:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     95:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     96:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     97:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     98:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     99:  * SUCH DAMAGE.
                    100:  *
                    101:  *     @(#)igmp.c      8.1 (Berkeley) 7/19/93
                    102:  */
1.16      lukem     103:
                    104: #include <sys/cdefs.h>
1.45.2.2! yamt      105: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.45.2.1 2009/05/04 08:14:19 yamt Exp $");
1.2       itojun    106:
                    107: #include "opt_inet.h"
                    108:
                    109: #include <sys/param.h>
                    110: #include <sys/systm.h>
                    111: #include <sys/mbuf.h>
                    112: #include <sys/socket.h>
1.45      ad        113: #include <sys/socketvar.h>
1.2       itojun    114: #include <sys/protosw.h>
                    115: #include <sys/syslog.h>
1.31      rpaulo    116: #include <sys/sysctl.h>
                    117: #include <sys/kernel.h>
                    118: #include <sys/callout.h>
1.2       itojun    119:
                    120: #include <net/if.h>
                    121:
                    122: #include <netinet/in.h>
                    123: #include <netinet/in_var.h>
1.31      rpaulo    124: #include <netinet6/in6_var.h>
1.10      itojun    125: #include <netinet/ip6.h>
1.2       itojun    126: #include <netinet6/ip6_var.h>
1.29      rpaulo    127: #include <netinet6/scope6_var.h>
1.10      itojun    128: #include <netinet/icmp6.h>
1.44      thorpej   129: #include <netinet6/icmp6_private.h>
1.2       itojun    130: #include <netinet6/mld6_var.h>
                    131:
1.7       itojun    132: #include <net/net_osdep.h>
                    133:
1.31      rpaulo    134:
                    135: /*
                    136:  * This structure is used to keep track of in6_multi chains which belong to
                    137:  * deleted interface addresses.
                    138:  */
                    139: static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */
                    140:
                    141: struct multi6_kludge {
                    142:        LIST_ENTRY(multi6_kludge) mk_entry;
                    143:        struct ifnet *mk_ifp;
                    144:        struct in6_multihead mk_head;
                    145: };
                    146:
                    147:
1.2       itojun    148: /*
                    149:  * Protocol constants
                    150:  */
                    151:
                    152: /*
                    153:  * time between repetitions of a node's initial report of interest in a
                    154:  * multicast address(in seconds)
                    155:  */
1.22      itojun    156: #define MLD_UNSOLICITED_REPORT_INTERVAL        10
1.2       itojun    157:
                    158: static struct ip6_pktopts ip6_opts;
                    159:
1.31      rpaulo    160: static void mld_start_listening(struct in6_multi *);
                    161: static void mld_stop_listening(struct in6_multi *);
                    162:
                    163: static struct mld_hdr * mld_allocbuf(struct mbuf **, int, struct in6_multi *,
                    164:        int);
                    165: static void mld_sendpkt(struct in6_multi *, int, const struct in6_addr *);
                    166: static void mld_starttimer(struct in6_multi *);
                    167: static void mld_stoptimer(struct in6_multi *);
                    168: static u_long mld_timerresid(struct in6_multi *);
1.2       itojun    169:
                    170: void
1.42      matt      171: mld_init(void)
1.2       itojun    172: {
                    173:        static u_int8_t hbh_buf[8];
                    174:        struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
                    175:        u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
                    176:
                    177:        /* ip6h_nxt will be fill in later */
1.11      itojun    178:        hbh->ip6h_len = 0;      /* (8 >> 3) - 1 */
1.2       itojun    179:
                    180:        /* XXX: grotty hard coding... */
                    181:        hbh_buf[2] = IP6OPT_PADN;       /* 2 byte padding */
                    182:        hbh_buf[3] = 0;
                    183:        hbh_buf[4] = IP6OPT_RTALERT;
                    184:        hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
1.45.2.1  yamt      185:        memcpy(&hbh_buf[6], (void *)&rtalert_code, sizeof(u_int16_t));
1.2       itojun    186:
                    187:        ip6_opts.ip6po_hbh = hbh;
                    188:        /* We will specify the hoplimit by a multicast option. */
                    189:        ip6_opts.ip6po_hlim = -1;
                    190: }
                    191:
1.31      rpaulo    192: static void
1.38      christos  193: mld_starttimer(struct in6_multi *in6m)
1.31      rpaulo    194: {
                    195:        struct timeval now;
                    196:
                    197:        microtime(&now);
                    198:        in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz;
                    199:        in6m->in6m_timer_expire.tv_usec = now.tv_usec +
                    200:            (in6m->in6m_timer % hz) * (1000000 / hz);
                    201:        if (in6m->in6m_timer_expire.tv_usec > 1000000) {
                    202:                in6m->in6m_timer_expire.tv_sec++;
                    203:                in6m->in6m_timer_expire.tv_usec -= 1000000;
                    204:        }
                    205:
                    206:        /* start or restart the timer */
1.41      joerg     207:        callout_schedule(&in6m->in6m_timer_ch, in6m->in6m_timer);
1.31      rpaulo    208: }
                    209:
                    210: static void
1.38      christos  211: mld_stoptimer(struct in6_multi *in6m)
1.31      rpaulo    212: {
                    213:        if (in6m->in6m_timer == IN6M_TIMER_UNDEF)
                    214:                return;
                    215:
1.41      joerg     216:        callout_stop(&in6m->in6m_timer_ch);
1.31      rpaulo    217:
                    218:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    219: }
                    220:
                    221: static void
1.41      joerg     222: mld_timeo(void *arg)
1.31      rpaulo    223: {
1.41      joerg     224:        struct in6_multi *in6m = arg;
1.45      ad        225:
                    226:        mutex_enter(softnet_lock);
                    227:        KERNEL_LOCK(1, NULL);
1.31      rpaulo    228:
                    229:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    230:
                    231:        switch (in6m->in6m_state) {
                    232:        case MLD_REPORTPENDING:
                    233:                mld_start_listening(in6m);
                    234:                break;
                    235:        default:
                    236:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    237:                break;
                    238:        }
                    239:
1.45      ad        240:        KERNEL_UNLOCK_ONE(NULL);
                    241:        mutex_exit(softnet_lock);
1.31      rpaulo    242: }
                    243:
                    244: static u_long
1.38      christos  245: mld_timerresid(struct in6_multi *in6m)
1.31      rpaulo    246: {
                    247:        struct timeval now, diff;
                    248:
                    249:        microtime(&now);
                    250:
                    251:        if (now.tv_sec > in6m->in6m_timer_expire.tv_sec ||
                    252:            (now.tv_sec == in6m->in6m_timer_expire.tv_sec &&
                    253:            now.tv_usec > in6m->in6m_timer_expire.tv_usec)) {
                    254:                return (0);
                    255:        }
                    256:        diff = in6m->in6m_timer_expire;
                    257:        diff.tv_sec -= now.tv_sec;
                    258:        diff.tv_usec -= now.tv_usec;
                    259:        if (diff.tv_usec < 0) {
                    260:                diff.tv_sec--;
                    261:                diff.tv_usec += 1000000;
                    262:        }
                    263:
                    264:        /* return the remaining time in milliseconds */
1.45.2.1  yamt      265:        return diff.tv_sec * 1000 + diff.tv_usec / 1000;
1.31      rpaulo    266: }
                    267:
                    268: static void
1.38      christos  269: mld_start_listening(struct in6_multi *in6m)
1.2       itojun    270: {
1.29      rpaulo    271:        struct in6_addr all_in6;
                    272:
1.2       itojun    273:        /*
1.11      itojun    274:         * RFC2710 page 10:
1.2       itojun    275:         * The node never sends a Report or Done for the link-scope all-nodes
                    276:         * address.
                    277:         * MLD messages are never sent for multicast addresses whose scope is 0
                    278:         * (reserved) or 1 (node-local).
                    279:         */
1.29      rpaulo    280:        all_in6 = in6addr_linklocal_allnodes;
                    281:        if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) {
                    282:                /* XXX: this should not happen! */
                    283:                in6m->in6m_timer = 0;
                    284:                in6m->in6m_state = MLD_OTHERLISTENER;
                    285:        }
                    286:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.2       itojun    287:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
1.31      rpaulo    288:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.22      itojun    289:                in6m->in6m_state = MLD_OTHERLISTENER;
1.2       itojun    290:        } else {
1.31      rpaulo    291:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    292:                in6m->in6m_timer = arc4random() %
                    293:                    (MLD_UNSOLICITED_REPORT_INTERVAL * hz);
1.22      itojun    294:                in6m->in6m_state = MLD_IREPORTEDLAST;
1.31      rpaulo    295:
                    296:                mld_starttimer(in6m);
1.2       itojun    297:        }
                    298: }
                    299:
1.31      rpaulo    300: static void
1.38      christos  301: mld_stop_listening(struct in6_multi *in6m)
1.2       itojun    302: {
1.29      rpaulo    303:        struct in6_addr allnode, allrouter;
                    304:
                    305:        allnode = in6addr_linklocal_allnodes;
                    306:        if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) {
                    307:                /* XXX: this should not happen! */
                    308:                return;
                    309:        }
                    310:        allrouter = in6addr_linklocal_allrouters;
                    311:        if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) {
                    312:                /* XXX impossible */
                    313:                return;
                    314:        }
1.2       itojun    315:
1.22      itojun    316:        if (in6m->in6m_state == MLD_IREPORTEDLAST &&
1.29      rpaulo    317:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode)) &&
                    318:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) >
                    319:            IPV6_ADDR_SCOPE_INTFACELOCAL) {
1.31      rpaulo    320:                mld_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter);
1.29      rpaulo    321:        }
1.2       itojun    322: }
                    323:
                    324: void
1.38      christos  325: mld_input(struct mbuf *m, int off)
1.2       itojun    326: {
                    327:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    328:        struct mld_hdr *mldh;
1.2       itojun    329:        struct ifnet *ifp = m->m_pkthdr.rcvif;
1.31      rpaulo    330:        struct in6_multi *in6m = NULL;
1.29      rpaulo    331:        struct in6_addr mld_addr, all_in6;
1.2       itojun    332:        struct in6_ifaddr *ia;
1.45.2.1  yamt      333:        u_long timer = 0;       /* timer value in the MLD query header */
1.2       itojun    334:
1.22      itojun    335:        IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
1.13      itojun    336:        if (mldh == NULL) {
1.44      thorpej   337:                ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1.13      itojun    338:                return;
                    339:        }
                    340:
1.2       itojun    341:        /* source address validation */
1.13      itojun    342:        ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2       itojun    343:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.31      rpaulo    344:                /*
                    345:                 * RFC3590 allows the IPv6 unspecified address as the source
                    346:                 * address of MLD report and done messages.  However, as this
                    347:                 * same document says, this special rule is for snooping
                    348:                 * switches and the RFC requires routers to discard MLD packets
                    349:                 * with the unspecified source address.  The RFC only talks
                    350:                 * about hosts receiving an MLD query or report in Security
                    351:                 * Considerations, but this is probably the correct intention.
                    352:                 * RFC3590 does not talk about other cases than link-local and
                    353:                 * the unspecified source addresses, but we believe the same
                    354:                 * rule should be applied.
                    355:                 * As a result, we only allow link-local addresses as the
                    356:                 * source address; otherwise, simply discard the packet.
                    357:                 */
1.18      itojun    358: #if 0
1.31      rpaulo    359:                /*
                    360:                 * XXX: do not log in an input path to avoid log flooding,
                    361:                 * though RFC3590 says "SHOULD log" if the source of a query
                    362:                 * is the unspecified address.
                    363:                 */
                    364:                log(LOG_INFO,
1.22      itojun    365:                    "mld_input: src %s is not link-local (grp=%s)\n",
1.31      rpaulo    366:                    ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&mldh->mld_addr));
1.18      itojun    367: #endif
1.11      itojun    368:                m_freem(m);
1.2       itojun    369:                return;
                    370:        }
                    371:
                    372:        /*
1.29      rpaulo    373:         * make a copy for local work (in6_setscope() may modify the 1st arg)
                    374:         */
                    375:        mld_addr = mldh->mld_addr;
                    376:        if (in6_setscope(&mld_addr, ifp, NULL)) {
                    377:                /* XXX: this should not happen! */
                    378:                m_free(m);
                    379:                return;
                    380:        }
                    381:
                    382:        /*
1.31      rpaulo    383:         * In the MLD specification, there are 3 states and a flag.
1.2       itojun    384:         *
                    385:         * In Non-Listener state, we simply don't have a membership record.
                    386:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
1.31      rpaulo    387:         * In Idle Listener state, our timer is not running
                    388:         * (in6m->in6m_timer==IN6M_TIMER_UNDEF)
1.2       itojun    389:         *
1.22      itojun    390:         * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
                    391:         * we have heard a report from another member, or MLD_IREPORTEDLAST
1.2       itojun    392:         * if we sent the last report.
                    393:         */
1.22      itojun    394:        switch (mldh->mld_type) {
                    395:        case MLD_LISTENER_QUERY:
1.7       itojun    396:                if (ifp->if_flags & IFF_LOOPBACK)
                    397:                        break;
                    398:
1.29      rpaulo    399:                if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    400:                    !IN6_IS_ADDR_MULTICAST(&mld_addr))
1.7       itojun    401:                        break;  /* print error or log stat? */
1.29      rpaulo    402:
                    403:                all_in6 = in6addr_linklocal_allnodes;
                    404:                if (in6_setscope(&all_in6, ifp, NULL)) {
                    405:                        /* XXX: this should not happen! */
                    406:                        break;
                    407:                }
1.2       itojun    408:
1.7       itojun    409:                /*
1.11      itojun    410:                 * - Start the timers in all of our membership records
                    411:                 *   that the query applies to for the interface on
                    412:                 *   which the query arrived excl. those that belong
                    413:                 *   to the "all-nodes" group (ff02::1).
                    414:                 * - Restart any timer that is already running but has
1.30      rpaulo    415:                 *   a value longer than the requested timeout.
1.11      itojun    416:                 * - Use the value specified in the query message as
                    417:                 *   the maximum timeout.
                    418:                 */
1.31      rpaulo    419:                timer = ntohs(mldh->mld_maxdelay);
                    420:
1.7       itojun    421:                IFP_TO_IA6(ifp, ia);
                    422:                if (ia == NULL)
                    423:                        break;
1.2       itojun    424:
1.35      dyoung    425:                LIST_FOREACH(in6m, &ia->ia6_multiaddrs, in6m_entry) {
1.29      rpaulo    426:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.7       itojun    427:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
                    428:                            IPV6_ADDR_SCOPE_LINKLOCAL)
                    429:                                continue;
1.2       itojun    430:
1.31      rpaulo    431:                        if (in6m->in6m_state == MLD_REPORTPENDING)
                    432:                                continue; /* we are not yet ready */
                    433:
                    434:                        if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    435:                            !IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr))
                    436:                                continue;
                    437:
                    438:                        if (timer == 0) {
                    439:                                /* send a report immediately */
                    440:                                mld_stoptimer(in6m);
                    441:                                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    442:                                in6m->in6m_state = MLD_IREPORTEDLAST;
                    443:                        } else if (in6m->in6m_timer == IN6M_TIMER_UNDEF ||
1.45.2.1  yamt      444:                            mld_timerresid(in6m) > timer) {
                    445:                                in6m->in6m_timer =
                    446:                                   1 + (arc4random() % timer) * hz / 1000;
1.31      rpaulo    447:                                mld_starttimer(in6m);
1.7       itojun    448:                        }
                    449:                }
1.29      rpaulo    450:                break;
1.2       itojun    451:
1.22      itojun    452:        case MLD_LISTENER_REPORT:
1.2       itojun    453:                /*
1.11      itojun    454:                 * For fast leave to work, we have to know that we are the
                    455:                 * last person to send a report for this group.  Reports
                    456:                 * can potentially get looped back if we are a multicast
                    457:                 * router, so discard reports sourced by me.
                    458:                 * Note that it is impossible to check IFF_LOOPBACK flag of
                    459:                 * ifp for this purpose, since ip6_mloopback pass the physical
                    460:                 * interface to looutput.
                    461:                 */
1.7       itojun    462:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
                    463:                        break;
                    464:
1.22      itojun    465:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7       itojun    466:                        break;
                    467:
                    468:                /*
1.11      itojun    469:                 * If we belong to the group being reported, stop
                    470:                 * our timer for that group.
                    471:                 */
1.29      rpaulo    472:                IN6_LOOKUP_MULTI(mld_addr, ifp, in6m);
1.7       itojun    473:                if (in6m) {
1.31      rpaulo    474:                        mld_stoptimer(in6m); /* transit to idle state */
1.22      itojun    475:                        in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7       itojun    476:                }
                    477:                break;
                    478:        default:                /* this is impossible */
1.18      itojun    479: #if 0
1.19      itojun    480:                /*
                    481:                 * this case should be impossible because of filtering in
                    482:                 * icmp6_input().  But we explicitly disabled this part
                    483:                 * just in case.
                    484:                 */
1.31      rpaulo    485:                log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld_type);
1.18      itojun    486: #endif
1.7       itojun    487:                break;
1.2       itojun    488:        }
1.11      itojun    489:
                    490:        m_freem(m);
1.2       itojun    491: }
                    492:
                    493: static void
1.38      christos  494: mld_sendpkt(struct in6_multi *in6m, int type,
                    495:        const struct in6_addr *dst)
1.2       itojun    496: {
1.31      rpaulo    497:        struct mbuf *mh;
1.22      itojun    498:        struct mld_hdr *mldh;
1.31      rpaulo    499:        struct ip6_hdr *ip6 = NULL;
1.2       itojun    500:        struct ip6_moptions im6o;
1.31      rpaulo    501:        struct in6_ifaddr *ia = NULL;
1.2       itojun    502:        struct ifnet *ifp = in6m->in6m_ifp;
1.19      itojun    503:        int ignflags;
1.2       itojun    504:
                    505:        /*
                    506:         * At first, find a link local address on the outgoing interface
                    507:         * to use as the source address of the MLD packet.
1.19      itojun    508:         * We do not reject tentative addresses for MLD report to deal with
                    509:         * the case where we first join a link-local address.
1.2       itojun    510:         */
1.19      itojun    511:        ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
                    512:        if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
1.2       itojun    513:                return;
1.19      itojun    514:        if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
                    515:                ia = NULL;
1.2       itojun    516:
1.31      rpaulo    517:        /* Allocate two mbufs to store IPv6 header and MLD header */
                    518:        mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type);
                    519:        if (mldh == NULL)
1.2       itojun    520:                return;
                    521:
1.31      rpaulo    522:        /* fill src/dst here */
                    523:        ip6 = mtod(mh, struct ip6_hdr *);
                    524:        ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
                    525:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
1.2       itojun    526:
1.22      itojun    527:        mldh->mld_addr = in6m->in6m_addr;
1.29      rpaulo    528:        in6_clearscope(&mldh->mld_addr); /* XXX */
1.22      itojun    529:        mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
                    530:            sizeof(struct mld_hdr));
1.2       itojun    531:
                    532:        /* construct multicast option */
1.31      rpaulo    533:        memset(&im6o, 0, sizeof(im6o));
1.2       itojun    534:        im6o.im6o_multicast_ifp = ifp;
                    535:        im6o.im6o_multicast_hlim = 1;
                    536:
                    537:        /*
                    538:         * Request loopback of the report if we are acting as a multicast
                    539:         * router, so that the process-level routing daemon can hear it.
                    540:         */
                    541:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    542:
                    543:        /* increment output statictics */
1.44      thorpej   544:        ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
1.15      itojun    545:        icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17      itojun    546:        switch (type) {
1.22      itojun    547:        case MLD_LISTENER_QUERY:
1.15      itojun    548:                icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
                    549:                break;
1.22      itojun    550:        case MLD_LISTENER_REPORT:
1.15      itojun    551:                icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
                    552:                break;
1.22      itojun    553:        case MLD_LISTENER_DONE:
1.15      itojun    554:                icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
                    555:                break;
1.7       itojun    556:        }
1.19      itojun    557:
1.27      perry     558:        ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC,
1.25      itojun    559:            &im6o, (struct socket *)NULL, NULL);
1.2       itojun    560: }
1.31      rpaulo    561:
                    562: static struct mld_hdr *
1.34      christos  563: mld_allocbuf(struct mbuf **mh, int len, struct in6_multi *in6m,
1.33      christos  564:     int type)
1.31      rpaulo    565: {
                    566:        struct mbuf *md;
                    567:        struct mld_hdr *mldh;
                    568:        struct ip6_hdr *ip6;
                    569:
                    570:        /*
                    571:         * Allocate mbufs to store ip6 header and MLD header.
                    572:         * We allocate 2 mbufs and make chain in advance because
                    573:         * it is more convenient when inserting the hop-by-hop option later.
                    574:         */
                    575:        MGETHDR(*mh, M_DONTWAIT, MT_HEADER);
                    576:        if (*mh == NULL)
                    577:                return NULL;
                    578:        MGET(md, M_DONTWAIT, MT_DATA);
                    579:        if (md == NULL) {
                    580:                m_free(*mh);
                    581:                *mh = NULL;
                    582:                return NULL;
                    583:        }
                    584:        (*mh)->m_next = md;
                    585:        md->m_next = NULL;
                    586:
                    587:        (*mh)->m_pkthdr.rcvif = NULL;
                    588:        (*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len;
                    589:        (*mh)->m_len = sizeof(struct ip6_hdr);
                    590:        MH_ALIGN(*mh, sizeof(struct ip6_hdr));
                    591:
                    592:        /* fill in the ip6 header */
                    593:        ip6 = mtod(*mh, struct ip6_hdr *);
                    594:        memset(ip6, 0, sizeof(*ip6));
                    595:        ip6->ip6_flow = 0;
                    596:        ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
                    597:        ip6->ip6_vfc |= IPV6_VERSION;
                    598:        /* ip6_plen will be set later */
                    599:        ip6->ip6_nxt = IPPROTO_ICMPV6;
                    600:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
                    601:        /* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */
                    602:
                    603:        /* fill in the MLD header as much as possible */
                    604:        md->m_len = len;
                    605:        mldh = mtod(md, struct mld_hdr *);
                    606:        memset(mldh, 0, len);
                    607:        mldh->mld_type = type;
                    608:        return mldh;
                    609: }
                    610:
                    611: /*
                    612:  * Add an address to the list of IP6 multicast addresses for a given interface.
                    613:  */
                    614: struct in6_multi *
1.38      christos  615: in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp,
                    616:        int *errorp, int timer)
1.31      rpaulo    617: {
                    618:        struct  in6_ifaddr *ia;
                    619:        struct  in6_ifreq ifr;
                    620:        struct  in6_multi *in6m;
                    621:        int     s = splsoftnet();
                    622:
                    623:        *errorp = 0;
                    624:
                    625:        /*
                    626:         * See if address already in list.
                    627:         */
                    628:        IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
                    629:        if (in6m != NULL) {
                    630:                /*
                    631:                 * Found it; just increment the refrence count.
                    632:                 */
                    633:                in6m->in6m_refcount++;
                    634:        } else {
                    635:                /*
                    636:                 * New address; allocate a new multicast record
                    637:                 * and link it into the interface's multicast list.
                    638:                 */
                    639:                in6m = (struct in6_multi *)
1.45.2.2! yamt      640:                        malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT|M_ZERO);
1.31      rpaulo    641:                if (in6m == NULL) {
                    642:                        splx(s);
                    643:                        *errorp = ENOBUFS;
                    644:                        return (NULL);
                    645:                }
                    646:
                    647:                in6m->in6m_addr = *maddr6;
                    648:                in6m->in6m_ifp = ifp;
                    649:                in6m->in6m_refcount = 1;
                    650:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    651:                IFP_TO_IA6(ifp, ia);
                    652:                if (ia == NULL) {
                    653:                        free(in6m, M_IPMADDR);
                    654:                        splx(s);
                    655:                        *errorp = EADDRNOTAVAIL; /* appropriate? */
                    656:                        return (NULL);
                    657:                }
                    658:                in6m->in6m_ia = ia;
                    659:                IFAREF(&ia->ia_ifa); /* gain a reference */
                    660:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    661:
                    662:                /*
                    663:                 * Ask the network driver to update its multicast reception
                    664:                 * filter appropriately for the new address.
                    665:                 */
1.40      dyoung    666:                sockaddr_in6_init(&ifr.ifr_addr, maddr6, 0, 0, 0);
1.45.2.1  yamt      667:                *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, &ifr);
1.31      rpaulo    668:                if (*errorp) {
                    669:                        LIST_REMOVE(in6m, in6m_entry);
                    670:                        free(in6m, M_IPMADDR);
                    671:                        IFAFREE(&ia->ia_ifa);
                    672:                        splx(s);
                    673:                        return (NULL);
                    674:                }
                    675:
1.45      ad        676:                callout_init(&in6m->in6m_timer_ch, CALLOUT_MPSAFE);
1.41      joerg     677:                callout_setfunc(&in6m->in6m_timer_ch, mld_timeo, in6m);
1.32      rpaulo    678:                in6m->in6m_timer = timer;
1.31      rpaulo    679:                if (in6m->in6m_timer > 0) {
                    680:                        in6m->in6m_state = MLD_REPORTPENDING;
                    681:                        mld_starttimer(in6m);
                    682:
                    683:                        splx(s);
                    684:                        return (in6m);
                    685:                }
                    686:
                    687:                /*
                    688:                 * Let MLD6 know that we have joined a new IP6 multicast
                    689:                 * group.
                    690:                 */
                    691:                mld_start_listening(in6m);
                    692:        }
                    693:        splx(s);
                    694:        return (in6m);
                    695: }
                    696:
                    697: /*
                    698:  * Delete a multicast address record.
                    699:  */
                    700: void
1.38      christos  701: in6_delmulti(struct in6_multi *in6m)
1.31      rpaulo    702: {
                    703:        struct  in6_ifreq ifr;
                    704:        struct  in6_ifaddr *ia;
                    705:        int     s = splsoftnet();
                    706:
                    707:        mld_stoptimer(in6m);
                    708:
                    709:        if (--in6m->in6m_refcount == 0) {
                    710:                /*
                    711:                 * No remaining claims to this record; let MLD6 know
                    712:                 * that we are leaving the multicast group.
                    713:                 */
                    714:                mld_stop_listening(in6m);
                    715:
                    716:                /*
                    717:                 * Unlink from list.
                    718:                 */
                    719:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    720:                if (in6m->in6m_ia != NULL) {
1.31      rpaulo    721:                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
1.35      dyoung    722:                        in6m->in6m_ia = NULL;
1.31      rpaulo    723:                }
                    724:
                    725:                /*
                    726:                 * Delete all references of this multicasting group from
                    727:                 * the membership arrays
                    728:                 */
                    729:                for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
                    730:                        struct in6_multi_mship *imm;
1.35      dyoung    731:                        LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) {
1.31      rpaulo    732:                                if (imm->i6mm_maddr == in6m)
                    733:                                        imm->i6mm_maddr = NULL;
                    734:                        }
                    735:                }
                    736:
                    737:                /*
                    738:                 * Notify the network driver to update its multicast
                    739:                 * reception filter.
                    740:                 */
1.40      dyoung    741:                sockaddr_in6_init(&ifr.ifr_addr, &in6m->in6m_addr, 0, 0, 0);
1.45.2.1  yamt      742:                (*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp, SIOCDELMULTI, &ifr);
1.41      joerg     743:                callout_destroy(&in6m->in6m_timer_ch);
1.31      rpaulo    744:                free(in6m, M_IPMADDR);
                    745:        }
                    746:        splx(s);
                    747: }
                    748:
                    749:
                    750: struct in6_multi_mship *
1.38      christos  751: in6_joingroup(struct ifnet *ifp, struct in6_addr *addr,
                    752:        int *errorp, int timer)
1.31      rpaulo    753: {
                    754:        struct in6_multi_mship *imm;
                    755:
1.45.2.2! yamt      756:        imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT|M_ZERO);
        !           757:        if (imm == NULL) {
1.31      rpaulo    758:                *errorp = ENOBUFS;
                    759:                return NULL;
                    760:        }
                    761:
1.32      rpaulo    762:        imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, timer);
1.31      rpaulo    763:        if (!imm->i6mm_maddr) {
1.36      dyoung    764:                /* *errorp is already set */
1.31      rpaulo    765:                free(imm, M_IPMADDR);
                    766:                return NULL;
                    767:        }
                    768:        return imm;
                    769: }
                    770:
                    771: int
1.38      christos  772: in6_leavegroup(struct in6_multi_mship *imm)
1.31      rpaulo    773: {
                    774:
                    775:        if (imm->i6mm_maddr) {
                    776:                in6_delmulti(imm->i6mm_maddr);
                    777:        }
                    778:        free(imm, M_IPMADDR);
                    779:        return 0;
                    780: }
                    781:
                    782:
                    783: /*
                    784:  * Multicast address kludge:
                    785:  * If there were any multicast addresses attached to this interface address,
                    786:  * either move them to another address on this interface, or save them until
                    787:  * such time as this interface is reconfigured for IPv6.
                    788:  */
                    789: void
1.38      christos  790: in6_savemkludge(struct in6_ifaddr *oia)
1.31      rpaulo    791: {
                    792:        struct in6_ifaddr *ia;
1.36      dyoung    793:        struct in6_multi *in6m;
1.31      rpaulo    794:
                    795:        IFP_TO_IA6(oia->ia_ifp, ia);
                    796:        if (ia) {       /* there is another address */
1.36      dyoung    797:                KASSERT(ia != oia);
                    798:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    799:                        LIST_REMOVE(in6m, in6m_entry);
                    800:                        IFAREF(&ia->ia_ifa);
1.31      rpaulo    801:                        IFAFREE(&in6m->in6m_ia->ia_ifa);
                    802:                        in6m->in6m_ia = ia;
                    803:                        LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    804:                }
                    805:        } else {        /* last address on this if deleted, save */
                    806:                struct multi6_kludge *mk;
                    807:
1.35      dyoung    808:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    809:                        if (mk->mk_ifp == oia->ia_ifp)
                    810:                                break;
                    811:                }
                    812:                if (mk == NULL) /* this should not happen! */
                    813:                        panic("in6_savemkludge: no kludge space");
                    814:
1.36      dyoung    815:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    816:                        LIST_REMOVE(in6m, in6m_entry);
1.31      rpaulo    817:                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
                    818:                        in6m->in6m_ia = NULL;
                    819:                        LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
                    820:                }
                    821:        }
                    822: }
                    823:
                    824: /*
                    825:  * Continuation of multicast address hack:
                    826:  * If there was a multicast group list previously saved for this interface,
                    827:  * then we re-attach it to the first address configured on the i/f.
                    828:  */
                    829: void
1.38      christos  830: in6_restoremkludge(struct in6_ifaddr *ia, struct ifnet *ifp)
1.31      rpaulo    831: {
                    832:        struct multi6_kludge *mk;
1.36      dyoung    833:        struct in6_multi *in6m;
1.31      rpaulo    834:
1.35      dyoung    835:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    836:                if (mk->mk_ifp == ifp)
1.31      rpaulo    837:                        break;
                    838:        }
1.35      dyoung    839:        if (mk == NULL)
                    840:                return;
1.36      dyoung    841:        while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) {
                    842:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    843:                in6m->in6m_ia = ia;
                    844:                IFAREF(&ia->ia_ifa);
                    845:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    846:        }
1.31      rpaulo    847: }
                    848:
                    849: /*
                    850:  * Allocate space for the kludge at interface initialization time.
                    851:  * Formerly, we dynamically allocated the space in in6_savemkludge() with
                    852:  * malloc(M_WAITOK).  However, it was wrong since the function could be called
                    853:  * under an interrupt context (software timer on address lifetime expiration).
                    854:  * Also, we cannot just give up allocating the strucutre, since the group
                    855:  * membership structure is very complex and we need to keep it anyway.
                    856:  * Of course, this function MUST NOT be called under an interrupt context.
                    857:  * Specifically, it is expected to be called only from in6_ifattach(), though
                    858:  * it is a global function.
                    859:  */
                    860: void
1.38      christos  861: in6_createmkludge(struct ifnet *ifp)
1.31      rpaulo    862: {
                    863:        struct multi6_kludge *mk;
                    864:
1.35      dyoung    865:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    866:                /* If we've already had one, do not allocate. */
                    867:                if (mk->mk_ifp == ifp)
                    868:                        return;
                    869:        }
                    870:
1.45.2.2! yamt      871:        mk = malloc(sizeof(*mk), M_IPMADDR, M_ZERO|M_WAITOK);
1.31      rpaulo    872:
                    873:        LIST_INIT(&mk->mk_head);
                    874:        mk->mk_ifp = ifp;
                    875:        LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
                    876: }
                    877:
                    878: void
1.38      christos  879: in6_purgemkludge(struct ifnet *ifp)
1.31      rpaulo    880: {
                    881:        struct multi6_kludge *mk;
1.36      dyoung    882:        struct in6_multi *in6m, *next;
1.31      rpaulo    883:
1.35      dyoung    884:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    885:                if (mk->mk_ifp == ifp)
                    886:                        break;
                    887:        }
                    888:        if (mk == NULL)
                    889:                return;
                    890:
                    891:        /* leave from all multicast groups joined */
1.36      dyoung    892:        for (in6m = LIST_FIRST(&mk->mk_head); in6m != NULL; in6m = next) {
                    893:                next = LIST_NEXT(in6m, in6m_entry);
1.35      dyoung    894:                in6_delmulti(in6m);
1.31      rpaulo    895:        }
1.35      dyoung    896:        LIST_REMOVE(mk, mk_entry);
                    897:        free(mk, M_IPMADDR);
1.31      rpaulo    898: }

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