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Annotation of src/sys/netinet6/mld6.c, Revision 1.30.2.1

1.30.2.1! yamt        1: /*     $NetBSD: mld6.c,v 1.30 2006/03/03 14:07:06 rpaulo 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>
1.30.2.1! yamt      105: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.30 2006/03/03 14:07:06 rpaulo 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>
                    113: #include <sys/protosw.h>
                    114: #include <sys/syslog.h>
1.30.2.1! yamt      115: #include <sys/sysctl.h>
        !           116: #include <sys/kernel.h>
        !           117: #include <sys/callout.h>
1.2       itojun    118:
                    119: #include <net/if.h>
                    120:
                    121: #include <netinet/in.h>
                    122: #include <netinet/in_var.h>
1.30.2.1! yamt      123: #include <netinet6/in6_var.h>
1.10      itojun    124: #include <netinet/ip6.h>
1.2       itojun    125: #include <netinet6/ip6_var.h>
1.29      rpaulo    126: #include <netinet6/scope6_var.h>
1.10      itojun    127: #include <netinet/icmp6.h>
1.2       itojun    128: #include <netinet6/mld6_var.h>
                    129:
1.7       itojun    130: #include <net/net_osdep.h>
                    131:
1.30.2.1! yamt      132:
        !           133: /*
        !           134:  * This structure is used to keep track of in6_multi chains which belong to
        !           135:  * deleted interface addresses.
        !           136:  */
        !           137: static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */
        !           138:
        !           139: struct multi6_kludge {
        !           140:        LIST_ENTRY(multi6_kludge) mk_entry;
        !           141:        struct ifnet *mk_ifp;
        !           142:        struct in6_multihead mk_head;
        !           143: };
        !           144:
        !           145:
1.2       itojun    146: /*
                    147:  * Protocol constants
                    148:  */
                    149:
                    150: /*
                    151:  * time between repetitions of a node's initial report of interest in a
                    152:  * multicast address(in seconds)
                    153:  */
1.22      itojun    154: #define MLD_UNSOLICITED_REPORT_INTERVAL        10
1.2       itojun    155:
                    156: static struct ip6_pktopts ip6_opts;
                    157:
1.30.2.1! yamt      158: static void mld_start_listening(struct in6_multi *);
        !           159: static void mld_stop_listening(struct in6_multi *);
        !           160:
        !           161: static struct mld_hdr * mld_allocbuf(struct mbuf **, int, struct in6_multi *,
        !           162:        int);
        !           163: static void mld_sendpkt(struct in6_multi *, int, const struct in6_addr *);
        !           164: static void mld_starttimer(struct in6_multi *);
        !           165: static void mld_stoptimer(struct in6_multi *);
        !           166: static void mld_timeo(struct in6_multi *);
        !           167: static u_long mld_timerresid(struct in6_multi *);
1.2       itojun    168:
                    169: void
1.30.2.1! yamt      170: mld_init()
1.2       itojun    171: {
                    172:        static u_int8_t hbh_buf[8];
                    173:        struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
                    174:        u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
                    175:
                    176:        /* ip6h_nxt will be fill in later */
1.11      itojun    177:        hbh->ip6h_len = 0;      /* (8 >> 3) - 1 */
1.2       itojun    178:
                    179:        /* XXX: grotty hard coding... */
                    180:        hbh_buf[2] = IP6OPT_PADN;       /* 2 byte padding */
                    181:        hbh_buf[3] = 0;
                    182:        hbh_buf[4] = IP6OPT_RTALERT;
                    183:        hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
                    184:        bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
                    185:
                    186:        ip6_opts.ip6po_hbh = hbh;
                    187:        /* We will specify the hoplimit by a multicast option. */
                    188:        ip6_opts.ip6po_hlim = -1;
                    189: }
                    190:
1.30.2.1! yamt      191: static void
        !           192: mld_starttimer(in6m)
        !           193:        struct in6_multi *in6m;
        !           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 */
        !           207:        callout_reset(in6m->in6m_timer_ch, in6m->in6m_timer,
        !           208:            (void (*) __P((void *)))mld_timeo, in6m);
        !           209: }
        !           210:
        !           211: static void
        !           212: mld_stoptimer(in6m)
        !           213:        struct in6_multi *in6m;
        !           214: {
        !           215:        if (in6m->in6m_timer == IN6M_TIMER_UNDEF)
        !           216:                return;
        !           217:
        !           218:        callout_stop(in6m->in6m_timer_ch);
        !           219:
        !           220:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
        !           221: }
        !           222:
        !           223: static void
        !           224: mld_timeo(in6m)
        !           225:        struct in6_multi *in6m;
        !           226: {
        !           227:        int s = splsoftnet();
        !           228:
        !           229:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
        !           230:
        !           231:        callout_stop(in6m->in6m_timer_ch);
        !           232:
        !           233:        switch (in6m->in6m_state) {
        !           234:        case MLD_REPORTPENDING:
        !           235:                mld_start_listening(in6m);
        !           236:                break;
        !           237:        default:
        !           238:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
        !           239:                break;
        !           240:        }
        !           241:
        !           242:        splx(s);
        !           243: }
        !           244:
        !           245: static u_long
        !           246: mld_timerresid(in6m)
        !           247:        struct in6_multi *in6m;
        !           248: {
        !           249:        struct timeval now, diff;
        !           250:
        !           251:        microtime(&now);
        !           252:
        !           253:        if (now.tv_sec > in6m->in6m_timer_expire.tv_sec ||
        !           254:            (now.tv_sec == in6m->in6m_timer_expire.tv_sec &&
        !           255:            now.tv_usec > in6m->in6m_timer_expire.tv_usec)) {
        !           256:                return (0);
        !           257:        }
        !           258:        diff = in6m->in6m_timer_expire;
        !           259:        diff.tv_sec -= now.tv_sec;
        !           260:        diff.tv_usec -= now.tv_usec;
        !           261:        if (diff.tv_usec < 0) {
        !           262:                diff.tv_sec--;
        !           263:                diff.tv_usec += 1000000;
        !           264:        }
        !           265:
        !           266:        /* return the remaining time in milliseconds */
        !           267:        return (((u_long)(diff.tv_sec * 1000000 + diff.tv_usec)) / 1000);
        !           268: }
        !           269:
        !           270: static void
        !           271: mld_start_listening(in6m)
1.2       itojun    272:        struct in6_multi *in6m;
                    273: {
1.29      rpaulo    274:        struct in6_addr all_in6;
                    275:
1.2       itojun    276:        /*
1.11      itojun    277:         * RFC2710 page 10:
1.2       itojun    278:         * The node never sends a Report or Done for the link-scope all-nodes
                    279:         * address.
                    280:         * MLD messages are never sent for multicast addresses whose scope is 0
                    281:         * (reserved) or 1 (node-local).
                    282:         */
1.29      rpaulo    283:        all_in6 = in6addr_linklocal_allnodes;
                    284:        if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) {
                    285:                /* XXX: this should not happen! */
                    286:                in6m->in6m_timer = 0;
                    287:                in6m->in6m_state = MLD_OTHERLISTENER;
                    288:        }
                    289:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.2       itojun    290:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
1.30.2.1! yamt      291:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.22      itojun    292:                in6m->in6m_state = MLD_OTHERLISTENER;
1.2       itojun    293:        } else {
1.30.2.1! yamt      294:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
        !           295:                in6m->in6m_timer = arc4random() %
        !           296:                    (MLD_UNSOLICITED_REPORT_INTERVAL * hz);
1.22      itojun    297:                in6m->in6m_state = MLD_IREPORTEDLAST;
1.30.2.1! yamt      298:
        !           299:                mld_starttimer(in6m);
1.2       itojun    300:        }
                    301: }
                    302:
1.30.2.1! yamt      303: static void
        !           304: mld_stop_listening(in6m)
1.2       itojun    305:        struct in6_multi *in6m;
                    306: {
1.29      rpaulo    307:        struct in6_addr allnode, allrouter;
                    308:
                    309:        allnode = in6addr_linklocal_allnodes;
                    310:        if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) {
                    311:                /* XXX: this should not happen! */
                    312:                return;
                    313:        }
                    314:        allrouter = in6addr_linklocal_allrouters;
                    315:        if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) {
                    316:                /* XXX impossible */
                    317:                return;
                    318:        }
1.2       itojun    319:
1.22      itojun    320:        if (in6m->in6m_state == MLD_IREPORTEDLAST &&
1.29      rpaulo    321:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode)) &&
                    322:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) >
                    323:            IPV6_ADDR_SCOPE_INTFACELOCAL) {
1.30.2.1! yamt      324:                mld_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter);
1.29      rpaulo    325:        }
1.2       itojun    326: }
                    327:
                    328: void
1.30.2.1! yamt      329: mld_input(m, off)
1.2       itojun    330:        struct mbuf *m;
                    331:        int off;
                    332: {
                    333:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    334:        struct mld_hdr *mldh;
1.2       itojun    335:        struct ifnet *ifp = m->m_pkthdr.rcvif;
1.30.2.1! yamt      336:        struct in6_multi *in6m = NULL;
1.29      rpaulo    337:        struct in6_addr mld_addr, all_in6;
1.2       itojun    338:        struct in6_ifaddr *ia;
1.30.2.1! yamt      339:        int timer = 0;          /* timer value in the MLD query header */
1.2       itojun    340:
1.22      itojun    341:        IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
1.13      itojun    342:        if (mldh == NULL) {
                    343:                icmp6stat.icp6s_tooshort++;
                    344:                return;
                    345:        }
                    346:
1.2       itojun    347:        /* source address validation */
1.13      itojun    348:        ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2       itojun    349:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.30.2.1! yamt      350:                /*
        !           351:                 * RFC3590 allows the IPv6 unspecified address as the source
        !           352:                 * address of MLD report and done messages.  However, as this
        !           353:                 * same document says, this special rule is for snooping
        !           354:                 * switches and the RFC requires routers to discard MLD packets
        !           355:                 * with the unspecified source address.  The RFC only talks
        !           356:                 * about hosts receiving an MLD query or report in Security
        !           357:                 * Considerations, but this is probably the correct intention.
        !           358:                 * RFC3590 does not talk about other cases than link-local and
        !           359:                 * the unspecified source addresses, but we believe the same
        !           360:                 * rule should be applied.
        !           361:                 * As a result, we only allow link-local addresses as the
        !           362:                 * source address; otherwise, simply discard the packet.
        !           363:                 */
1.18      itojun    364: #if 0
1.2       itojun    365:                /*
1.30.2.1! yamt      366:                 * XXX: do not log in an input path to avoid log flooding,
        !           367:                 * though RFC3590 says "SHOULD log" if the source of a query
        !           368:                 * is the unspecified address.
1.2       itojun    369:                 */
1.30.2.1! yamt      370:                log(LOG_INFO,
        !           371:                    "mld_input: src %s is not link-local (grp=%s)\n",
        !           372:                    ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&mldh->mld_addr));
        !           373: #endif
1.11      itojun    374:                m_freem(m);
1.2       itojun    375:                return;
                    376:        }
                    377:
                    378:        /*
1.29      rpaulo    379:         * make a copy for local work (in6_setscope() may modify the 1st arg)
                    380:         */
                    381:        mld_addr = mldh->mld_addr;
                    382:        if (in6_setscope(&mld_addr, ifp, NULL)) {
                    383:                /* XXX: this should not happen! */
                    384:                m_free(m);
                    385:                return;
                    386:        }
                    387:
                    388:        /*
1.30.2.1! yamt      389:         * In the MLD specification, there are 3 states and a flag.
1.2       itojun    390:         *
                    391:         * In Non-Listener state, we simply don't have a membership record.
                    392:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
1.30.2.1! yamt      393:         * In Idle Listener state, our timer is not running
        !           394:         * (in6m->in6m_timer==IN6M_TIMER_UNDEF)
1.2       itojun    395:         *
1.22      itojun    396:         * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
                    397:         * we have heard a report from another member, or MLD_IREPORTEDLAST
1.2       itojun    398:         * if we sent the last report.
                    399:         */
1.22      itojun    400:        switch (mldh->mld_type) {
                    401:        case MLD_LISTENER_QUERY:
1.7       itojun    402:                if (ifp->if_flags & IFF_LOOPBACK)
                    403:                        break;
                    404:
1.29      rpaulo    405:                if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    406:                    !IN6_IS_ADDR_MULTICAST(&mld_addr))
1.7       itojun    407:                        break;  /* print error or log stat? */
1.29      rpaulo    408:
                    409:                all_in6 = in6addr_linklocal_allnodes;
                    410:                if (in6_setscope(&all_in6, ifp, NULL)) {
                    411:                        /* XXX: this should not happen! */
                    412:                        break;
                    413:                }
1.2       itojun    414:
1.7       itojun    415:                /*
1.11      itojun    416:                 * - Start the timers in all of our membership records
                    417:                 *   that the query applies to for the interface on
                    418:                 *   which the query arrived excl. those that belong
                    419:                 *   to the "all-nodes" group (ff02::1).
                    420:                 * - Restart any timer that is already running but has
1.30      rpaulo    421:                 *   a value longer than the requested timeout.
1.11      itojun    422:                 * - Use the value specified in the query message as
                    423:                 *   the maximum timeout.
                    424:                 */
1.30.2.1! yamt      425:                timer = ntohs(mldh->mld_maxdelay);
        !           426:
1.7       itojun    427:                IFP_TO_IA6(ifp, ia);
                    428:                if (ia == NULL)
                    429:                        break;
1.2       itojun    430:
1.7       itojun    431:                for (in6m = ia->ia6_multiaddrs.lh_first;
                    432:                     in6m;
                    433:                     in6m = in6m->in6m_entry.le_next)
                    434:                {
1.29      rpaulo    435:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.7       itojun    436:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
                    437:                            IPV6_ADDR_SCOPE_LINKLOCAL)
                    438:                                continue;
1.2       itojun    439:
1.30.2.1! yamt      440:                        if (in6m->in6m_state == MLD_REPORTPENDING)
        !           441:                                continue; /* we are not yet ready */
        !           442:
        !           443:                        if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
        !           444:                            !IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr))
        !           445:                                continue;
        !           446:
        !           447:                        if (timer == 0) {
        !           448:                                /* send a report immediately */
        !           449:                                mld_stoptimer(in6m);
        !           450:                                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
        !           451:                                in6m->in6m_state = MLD_IREPORTEDLAST;
        !           452:                        } else if (in6m->in6m_timer == IN6M_TIMER_UNDEF ||
        !           453:                            mld_timerresid(in6m) > (u_long)timer) {
        !           454:                                in6m->in6m_timer = arc4random() %
        !           455:                                    (int)(((long)timer * hz) / 1000);
        !           456:                                mld_starttimer(in6m);
1.7       itojun    457:                        }
                    458:                }
1.29      rpaulo    459:                break;
1.2       itojun    460:
1.22      itojun    461:        case MLD_LISTENER_REPORT:
1.2       itojun    462:                /*
1.11      itojun    463:                 * For fast leave to work, we have to know that we are the
                    464:                 * last person to send a report for this group.  Reports
                    465:                 * can potentially get looped back if we are a multicast
                    466:                 * router, so discard reports sourced by me.
                    467:                 * Note that it is impossible to check IFF_LOOPBACK flag of
                    468:                 * ifp for this purpose, since ip6_mloopback pass the physical
                    469:                 * interface to looutput.
                    470:                 */
1.7       itojun    471:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
                    472:                        break;
                    473:
1.22      itojun    474:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7       itojun    475:                        break;
                    476:
                    477:                /*
1.11      itojun    478:                 * If we belong to the group being reported, stop
                    479:                 * our timer for that group.
                    480:                 */
1.29      rpaulo    481:                IN6_LOOKUP_MULTI(mld_addr, ifp, in6m);
1.7       itojun    482:                if (in6m) {
1.30.2.1! yamt      483:                        mld_stoptimer(in6m); /* transit to idle state */
1.22      itojun    484:                        in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7       itojun    485:                }
                    486:                break;
                    487:        default:                /* this is impossible */
1.18      itojun    488: #if 0
1.19      itojun    489:                /*
                    490:                 * this case should be impossible because of filtering in
                    491:                 * icmp6_input().  But we explicitly disabled this part
                    492:                 * just in case.
                    493:                 */
1.30.2.1! yamt      494:                log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld_type);
1.18      itojun    495: #endif
1.7       itojun    496:                break;
1.2       itojun    497:        }
1.11      itojun    498:
                    499:        m_freem(m);
1.2       itojun    500: }
                    501:
                    502: static void
1.30.2.1! yamt      503: mld_sendpkt(in6m, type, dst)
1.2       itojun    504:        struct in6_multi *in6m;
                    505:        int type;
                    506:        const struct in6_addr *dst;
                    507: {
1.30.2.1! yamt      508:        struct mbuf *mh;
1.22      itojun    509:        struct mld_hdr *mldh;
1.30.2.1! yamt      510:        struct ip6_hdr *ip6 = NULL;
1.2       itojun    511:        struct ip6_moptions im6o;
1.30.2.1! yamt      512:        struct in6_ifaddr *ia = NULL;
1.2       itojun    513:        struct ifnet *ifp = in6m->in6m_ifp;
1.19      itojun    514:        int ignflags;
1.2       itojun    515:
                    516:        /*
                    517:         * At first, find a link local address on the outgoing interface
                    518:         * to use as the source address of the MLD packet.
1.19      itojun    519:         * We do not reject tentative addresses for MLD report to deal with
                    520:         * the case where we first join a link-local address.
1.2       itojun    521:         */
1.19      itojun    522:        ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
                    523:        if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
1.2       itojun    524:                return;
1.19      itojun    525:        if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
                    526:                ia = NULL;
1.2       itojun    527:
1.30.2.1! yamt      528:        /* Allocate two mbufs to store IPv6 header and MLD header */
        !           529:        mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type);
        !           530:        if (mldh == NULL)
1.2       itojun    531:                return;
                    532:
1.30.2.1! yamt      533:        /* fill src/dst here */
        !           534:        ip6 = mtod(mh, struct ip6_hdr *);
        !           535:        ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
        !           536:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
1.2       itojun    537:
1.22      itojun    538:        mldh->mld_addr = in6m->in6m_addr;
1.29      rpaulo    539:        in6_clearscope(&mldh->mld_addr); /* XXX */
1.22      itojun    540:        mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
                    541:            sizeof(struct mld_hdr));
1.2       itojun    542:
                    543:        /* construct multicast option */
1.30.2.1! yamt      544:        memset(&im6o, 0, sizeof(im6o));
1.2       itojun    545:        im6o.im6o_multicast_ifp = ifp;
                    546:        im6o.im6o_multicast_hlim = 1;
                    547:
                    548:        /*
                    549:         * Request loopback of the report if we are acting as a multicast
                    550:         * router, so that the process-level routing daemon can hear it.
                    551:         */
                    552:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    553:
                    554:        /* increment output statictics */
                    555:        icmp6stat.icp6s_outhist[type]++;
1.15      itojun    556:        icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17      itojun    557:        switch (type) {
1.22      itojun    558:        case MLD_LISTENER_QUERY:
1.15      itojun    559:                icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
                    560:                break;
1.22      itojun    561:        case MLD_LISTENER_REPORT:
1.15      itojun    562:                icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
                    563:                break;
1.22      itojun    564:        case MLD_LISTENER_DONE:
1.15      itojun    565:                icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
                    566:                break;
1.7       itojun    567:        }
1.19      itojun    568:
1.27      perry     569:        ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC,
1.25      itojun    570:            &im6o, (struct socket *)NULL, NULL);
1.2       itojun    571: }
1.30.2.1! yamt      572:
        !           573: static struct mld_hdr *
        !           574: mld_allocbuf(mh, len, in6m, type)
        !           575:        struct mbuf **mh;
        !           576:        int len;
        !           577:        struct in6_multi *in6m;
        !           578:        int type;
        !           579: {
        !           580:        struct mbuf *md;
        !           581:        struct mld_hdr *mldh;
        !           582:        struct ip6_hdr *ip6;
        !           583:
        !           584:        /*
        !           585:         * Allocate mbufs to store ip6 header and MLD header.
        !           586:         * We allocate 2 mbufs and make chain in advance because
        !           587:         * it is more convenient when inserting the hop-by-hop option later.
        !           588:         */
        !           589:        MGETHDR(*mh, M_DONTWAIT, MT_HEADER);
        !           590:        if (*mh == NULL)
        !           591:                return NULL;
        !           592:        MGET(md, M_DONTWAIT, MT_DATA);
        !           593:        if (md == NULL) {
        !           594:                m_free(*mh);
        !           595:                *mh = NULL;
        !           596:                return NULL;
        !           597:        }
        !           598:        (*mh)->m_next = md;
        !           599:        md->m_next = NULL;
        !           600:
        !           601:        (*mh)->m_pkthdr.rcvif = NULL;
        !           602:        (*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len;
        !           603:        (*mh)->m_len = sizeof(struct ip6_hdr);
        !           604:        MH_ALIGN(*mh, sizeof(struct ip6_hdr));
        !           605:
        !           606:        /* fill in the ip6 header */
        !           607:        ip6 = mtod(*mh, struct ip6_hdr *);
        !           608:        memset(ip6, 0, sizeof(*ip6));
        !           609:        ip6->ip6_flow = 0;
        !           610:        ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
        !           611:        ip6->ip6_vfc |= IPV6_VERSION;
        !           612:        /* ip6_plen will be set later */
        !           613:        ip6->ip6_nxt = IPPROTO_ICMPV6;
        !           614:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
        !           615:        /* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */
        !           616:
        !           617:        /* fill in the MLD header as much as possible */
        !           618:        md->m_len = len;
        !           619:        mldh = mtod(md, struct mld_hdr *);
        !           620:        memset(mldh, 0, len);
        !           621:        mldh->mld_type = type;
        !           622:        return mldh;
        !           623: }
        !           624:
        !           625: /*
        !           626:  * Add an address to the list of IP6 multicast addresses for a given interface.
        !           627:  */
        !           628: struct in6_multi *
        !           629: in6_addmulti(maddr6, ifp, errorp, timer)
        !           630:        struct in6_addr *maddr6;
        !           631:        struct ifnet *ifp;
        !           632:        int *errorp, timer;
        !           633: {
        !           634:        struct  in6_ifaddr *ia;
        !           635:        struct  in6_ifreq ifr;
        !           636:        struct  in6_multi *in6m;
        !           637:        int     s = splsoftnet();
        !           638:
        !           639:        *errorp = 0;
        !           640:
        !           641:        /*
        !           642:         * See if address already in list.
        !           643:         */
        !           644:        IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
        !           645:        if (in6m != NULL) {
        !           646:                /*
        !           647:                 * Found it; just increment the refrence count.
        !           648:                 */
        !           649:                in6m->in6m_refcount++;
        !           650:        } else {
        !           651:                /*
        !           652:                 * New address; allocate a new multicast record
        !           653:                 * and link it into the interface's multicast list.
        !           654:                 */
        !           655:                in6m = (struct in6_multi *)
        !           656:                        malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
        !           657:                if (in6m == NULL) {
        !           658:                        splx(s);
        !           659:                        *errorp = ENOBUFS;
        !           660:                        return (NULL);
        !           661:                }
        !           662:
        !           663:                memset(in6m, 0, sizeof(*in6m));
        !           664:                in6m->in6m_addr = *maddr6;
        !           665:                in6m->in6m_ifp = ifp;
        !           666:                in6m->in6m_refcount = 1;
        !           667:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
        !           668:                in6m->in6m_timer_ch =
        !           669:                    malloc(sizeof(*in6m->in6m_timer_ch), M_IPMADDR, M_NOWAIT);
        !           670:                if (in6m->in6m_timer_ch == NULL) {
        !           671:                        free(in6m, M_IPMADDR);
        !           672:                        splx(s);
        !           673:                        return (NULL);
        !           674:                }
        !           675:                IFP_TO_IA6(ifp, ia);
        !           676:                if (ia == NULL) {
        !           677:                        free(in6m, M_IPMADDR);
        !           678:                        splx(s);
        !           679:                        *errorp = EADDRNOTAVAIL; /* appropriate? */
        !           680:                        return (NULL);
        !           681:                }
        !           682:                in6m->in6m_ia = ia;
        !           683:                IFAREF(&ia->ia_ifa); /* gain a reference */
        !           684:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
        !           685:
        !           686:                /*
        !           687:                 * Ask the network driver to update its multicast reception
        !           688:                 * filter appropriately for the new address.
        !           689:                 */
        !           690:                memset(&ifr.ifr_addr, 0, sizeof(struct sockaddr_in6));
        !           691:                ifr.ifr_addr.sin6_family = AF_INET6;
        !           692:                ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
        !           693:                ifr.ifr_addr.sin6_addr = *maddr6;
        !           694:                if (ifp->if_ioctl == NULL)
        !           695:                        *errorp = ENXIO; /* XXX: appropriate? */
        !           696:                else
        !           697:                        *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI,
        !           698:                            (caddr_t)&ifr);
        !           699:                if (*errorp) {
        !           700:                        LIST_REMOVE(in6m, in6m_entry);
        !           701:                        free(in6m, M_IPMADDR);
        !           702:                        IFAFREE(&ia->ia_ifa);
        !           703:                        splx(s);
        !           704:                        return (NULL);
        !           705:                }
        !           706:
        !           707:                callout_init(in6m->in6m_timer_ch);
        !           708:                in6m->in6m_timer = timer;
        !           709:                if (in6m->in6m_timer > 0) {
        !           710:                        in6m->in6m_state = MLD_REPORTPENDING;
        !           711:                        mld_starttimer(in6m);
        !           712:
        !           713:                        splx(s);
        !           714:                        return (in6m);
        !           715:                }
        !           716:
        !           717:                /*
        !           718:                 * Let MLD6 know that we have joined a new IP6 multicast
        !           719:                 * group.
        !           720:                 */
        !           721:                mld_start_listening(in6m);
        !           722:        }
        !           723:        splx(s);
        !           724:        return (in6m);
        !           725: }
        !           726:
        !           727: /*
        !           728:  * Delete a multicast address record.
        !           729:  */
        !           730: void
        !           731: in6_delmulti(in6m)
        !           732:        struct in6_multi *in6m;
        !           733: {
        !           734:        struct  in6_ifreq ifr;
        !           735:        struct  in6_ifaddr *ia;
        !           736:        int     s = splsoftnet();
        !           737:
        !           738:        mld_stoptimer(in6m);
        !           739:
        !           740:        if (--in6m->in6m_refcount == 0) {
        !           741:                /*
        !           742:                 * No remaining claims to this record; let MLD6 know
        !           743:                 * that we are leaving the multicast group.
        !           744:                 */
        !           745:                mld_stop_listening(in6m);
        !           746:
        !           747:                /*
        !           748:                 * Unlink from list.
        !           749:                 */
        !           750:                LIST_REMOVE(in6m, in6m_entry);
        !           751:                if (in6m->in6m_ia) {
        !           752:                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
        !           753:                }
        !           754:
        !           755:                /*
        !           756:                 * Delete all references of this multicasting group from
        !           757:                 * the membership arrays
        !           758:                 */
        !           759:                for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
        !           760:                        struct in6_multi_mship *imm;
        !           761:                        LIST_FOREACH(imm, &ia->ia6_memberships,
        !           762:                            i6mm_chain) {
        !           763:                                if (imm->i6mm_maddr == in6m)
        !           764:                                        imm->i6mm_maddr = NULL;
        !           765:                        }
        !           766:                }
        !           767:
        !           768:                /*
        !           769:                 * Notify the network driver to update its multicast
        !           770:                 * reception filter.
        !           771:                 */
        !           772:                memset(&ifr.ifr_addr, 0, sizeof(struct sockaddr_in6));
        !           773:                ifr.ifr_addr.sin6_family = AF_INET6;
        !           774:                ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
        !           775:                ifr.ifr_addr.sin6_addr = in6m->in6m_addr;
        !           776:                (*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp,
        !           777:                    SIOCDELMULTI, (caddr_t)&ifr);
        !           778:                free(in6m->in6m_timer_ch, M_IPMADDR);
        !           779:                free(in6m, M_IPMADDR);
        !           780:        }
        !           781:        splx(s);
        !           782: }
        !           783:
        !           784:
        !           785: struct in6_multi_mship *
        !           786: in6_joingroup(ifp, addr, errorp, timer)
        !           787:        struct ifnet *ifp;
        !           788:        struct in6_addr *addr;
        !           789:        int *errorp, timer;
        !           790: {
        !           791:        struct in6_multi_mship *imm;
        !           792:
        !           793:        imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT);
        !           794:        if (!imm) {
        !           795:                *errorp = ENOBUFS;
        !           796:                return NULL;
        !           797:        }
        !           798:
        !           799:        memset(imm, 0, sizeof(*imm));
        !           800:        imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, timer);
        !           801:        if (!imm->i6mm_maddr) {
        !           802:                /* *errorp is alrady set */
        !           803:                free(imm, M_IPMADDR);
        !           804:                return NULL;
        !           805:        }
        !           806:        return imm;
        !           807: }
        !           808:
        !           809: int
        !           810: in6_leavegroup(imm)
        !           811:        struct in6_multi_mship *imm;
        !           812: {
        !           813:
        !           814:        if (imm->i6mm_maddr) {
        !           815:                in6_delmulti(imm->i6mm_maddr);
        !           816:        }
        !           817:        free(imm, M_IPMADDR);
        !           818:        return 0;
        !           819: }
        !           820:
        !           821:
        !           822: /*
        !           823:  * Multicast address kludge:
        !           824:  * If there were any multicast addresses attached to this interface address,
        !           825:  * either move them to another address on this interface, or save them until
        !           826:  * such time as this interface is reconfigured for IPv6.
        !           827:  */
        !           828: void
        !           829: in6_savemkludge(oia)
        !           830:        struct in6_ifaddr *oia;
        !           831: {
        !           832:        struct in6_ifaddr *ia;
        !           833:        struct in6_multi *in6m, *next;
        !           834:
        !           835:        IFP_TO_IA6(oia->ia_ifp, ia);
        !           836:        if (ia) {       /* there is another address */
        !           837:                for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next) {
        !           838:                        next = in6m->in6m_entry.le_next;
        !           839:                        IFAFREE(&in6m->in6m_ia->ia_ifa);
        !           840:                        IFAREF(&ia->ia_ifa);
        !           841:                        in6m->in6m_ia = ia;
        !           842:                        LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
        !           843:                }
        !           844:        } else {        /* last address on this if deleted, save */
        !           845:                struct multi6_kludge *mk;
        !           846:
        !           847:                for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
        !           848:                        if (mk->mk_ifp == oia->ia_ifp)
        !           849:                                break;
        !           850:                }
        !           851:                if (mk == NULL) /* this should not happen! */
        !           852:                        panic("in6_savemkludge: no kludge space");
        !           853:
        !           854:                for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next) {
        !           855:                        next = in6m->in6m_entry.le_next;
        !           856:                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
        !           857:                        in6m->in6m_ia = NULL;
        !           858:                        LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
        !           859:                }
        !           860:        }
        !           861: }
        !           862:
        !           863: /*
        !           864:  * Continuation of multicast address hack:
        !           865:  * If there was a multicast group list previously saved for this interface,
        !           866:  * then we re-attach it to the first address configured on the i/f.
        !           867:  */
        !           868: void
        !           869: in6_restoremkludge(ia, ifp)
        !           870:        struct in6_ifaddr *ia;
        !           871:        struct ifnet *ifp;
        !           872: {
        !           873:        struct multi6_kludge *mk;
        !           874:
        !           875:        for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
        !           876:                if (mk->mk_ifp == ifp) {
        !           877:                        struct in6_multi *in6m, *next;
        !           878:
        !           879:                        for (in6m = mk->mk_head.lh_first; in6m; in6m = next) {
        !           880:                                next = in6m->in6m_entry.le_next;
        !           881:                                in6m->in6m_ia = ia;
        !           882:                                IFAREF(&ia->ia_ifa);
        !           883:                                LIST_INSERT_HEAD(&ia->ia6_multiaddrs,
        !           884:                                                 in6m, in6m_entry);
        !           885:                        }
        !           886:                        LIST_INIT(&mk->mk_head);
        !           887:                        break;
        !           888:                }
        !           889:        }
        !           890: }
        !           891:
        !           892: /*
        !           893:  * Allocate space for the kludge at interface initialization time.
        !           894:  * Formerly, we dynamically allocated the space in in6_savemkludge() with
        !           895:  * malloc(M_WAITOK).  However, it was wrong since the function could be called
        !           896:  * under an interrupt context (software timer on address lifetime expiration).
        !           897:  * Also, we cannot just give up allocating the strucutre, since the group
        !           898:  * membership structure is very complex and we need to keep it anyway.
        !           899:  * Of course, this function MUST NOT be called under an interrupt context.
        !           900:  * Specifically, it is expected to be called only from in6_ifattach(), though
        !           901:  * it is a global function.
        !           902:  */
        !           903: void
        !           904: in6_createmkludge(ifp)
        !           905:        struct ifnet *ifp;
        !           906: {
        !           907:        struct multi6_kludge *mk;
        !           908:
        !           909:        for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
        !           910:                /* If we've already had one, do not allocate. */
        !           911:                if (mk->mk_ifp == ifp)
        !           912:                        return;
        !           913:        }
        !           914:
        !           915:        mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK);
        !           916:
        !           917:        memset(mk, 0, sizeof(*mk));
        !           918:        LIST_INIT(&mk->mk_head);
        !           919:        mk->mk_ifp = ifp;
        !           920:        LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
        !           921: }
        !           922:
        !           923: void
        !           924: in6_purgemkludge(ifp)
        !           925:        struct ifnet *ifp;
        !           926: {
        !           927:        struct multi6_kludge *mk;
        !           928:        struct in6_multi *in6m;
        !           929:
        !           930:        for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
        !           931:                if (mk->mk_ifp != ifp)
        !           932:                        continue;
        !           933:
        !           934:                /* leave from all multicast groups joined */
        !           935:                while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) {
        !           936:                        in6_delmulti(in6m);
        !           937:                }
        !           938:                LIST_REMOVE(mk, mk_entry);
        !           939:                free(mk, M_IPMADDR);
        !           940:                break;
        !           941:        }
        !           942: }

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