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Annotation of src/sys/netinet6/mld6.c, Revision 1.39.6.1

1.39.6.1! jmcneill    1: /*     $NetBSD: mld6.c,v 1.40 2007/08/31 21:40:41 dyoung 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>
1.39.6.1! jmcneill  105: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.40 2007/08/31 21:40:41 dyoung 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>
1.31      rpaulo    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>
1.31      rpaulo    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:
1.31      rpaulo    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:
1.31      rpaulo    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
1.31      rpaulo    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;
1.37      christos  184:        bcopy((void *)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t));
1.2       itojun    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:
1.31      rpaulo    191: static void
1.38      christos  192: mld_starttimer(struct in6_multi *in6m)
1.31      rpaulo    193: {
                    194:        struct timeval now;
                    195:
                    196:        microtime(&now);
                    197:        in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz;
                    198:        in6m->in6m_timer_expire.tv_usec = now.tv_usec +
                    199:            (in6m->in6m_timer % hz) * (1000000 / hz);
                    200:        if (in6m->in6m_timer_expire.tv_usec > 1000000) {
                    201:                in6m->in6m_timer_expire.tv_sec++;
                    202:                in6m->in6m_timer_expire.tv_usec -= 1000000;
                    203:        }
                    204:
                    205:        /* start or restart the timer */
                    206:        callout_reset(in6m->in6m_timer_ch, in6m->in6m_timer,
                    207:            (void (*) __P((void *)))mld_timeo, in6m);
                    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:
                    216:        callout_stop(in6m->in6m_timer_ch);
                    217:
                    218:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    219: }
                    220:
                    221: static void
1.38      christos  222: mld_timeo(struct in6_multi *in6m)
1.31      rpaulo    223: {
                    224:        int s = splsoftnet();
                    225:
                    226:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    227:
                    228:        callout_stop(in6m->in6m_timer_ch);
                    229:
                    230:        switch (in6m->in6m_state) {
                    231:        case MLD_REPORTPENDING:
                    232:                mld_start_listening(in6m);
                    233:                break;
                    234:        default:
                    235:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    236:                break;
                    237:        }
                    238:
                    239:        splx(s);
                    240: }
                    241:
                    242: static u_long
1.38      christos  243: mld_timerresid(struct in6_multi *in6m)
1.31      rpaulo    244: {
                    245:        struct timeval now, diff;
                    246:
                    247:        microtime(&now);
                    248:
                    249:        if (now.tv_sec > in6m->in6m_timer_expire.tv_sec ||
                    250:            (now.tv_sec == in6m->in6m_timer_expire.tv_sec &&
                    251:            now.tv_usec > in6m->in6m_timer_expire.tv_usec)) {
                    252:                return (0);
                    253:        }
                    254:        diff = in6m->in6m_timer_expire;
                    255:        diff.tv_sec -= now.tv_sec;
                    256:        diff.tv_usec -= now.tv_usec;
                    257:        if (diff.tv_usec < 0) {
                    258:                diff.tv_sec--;
                    259:                diff.tv_usec += 1000000;
                    260:        }
                    261:
                    262:        /* return the remaining time in milliseconds */
                    263:        return (((u_long)(diff.tv_sec * 1000000 + diff.tv_usec)) / 1000);
                    264: }
                    265:
                    266: static void
1.38      christos  267: mld_start_listening(struct in6_multi *in6m)
1.2       itojun    268: {
1.29      rpaulo    269:        struct in6_addr all_in6;
                    270:
1.2       itojun    271:        /*
1.11      itojun    272:         * RFC2710 page 10:
1.2       itojun    273:         * The node never sends a Report or Done for the link-scope all-nodes
                    274:         * address.
                    275:         * MLD messages are never sent for multicast addresses whose scope is 0
                    276:         * (reserved) or 1 (node-local).
                    277:         */
1.29      rpaulo    278:        all_in6 = in6addr_linklocal_allnodes;
                    279:        if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) {
                    280:                /* XXX: this should not happen! */
                    281:                in6m->in6m_timer = 0;
                    282:                in6m->in6m_state = MLD_OTHERLISTENER;
                    283:        }
                    284:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.2       itojun    285:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
1.31      rpaulo    286:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.22      itojun    287:                in6m->in6m_state = MLD_OTHERLISTENER;
1.2       itojun    288:        } else {
1.31      rpaulo    289:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    290:                in6m->in6m_timer = arc4random() %
                    291:                    (MLD_UNSOLICITED_REPORT_INTERVAL * hz);
1.22      itojun    292:                in6m->in6m_state = MLD_IREPORTEDLAST;
1.31      rpaulo    293:
                    294:                mld_starttimer(in6m);
1.2       itojun    295:        }
                    296: }
                    297:
1.31      rpaulo    298: static void
1.38      christos  299: mld_stop_listening(struct in6_multi *in6m)
1.2       itojun    300: {
1.29      rpaulo    301:        struct in6_addr allnode, allrouter;
                    302:
                    303:        allnode = in6addr_linklocal_allnodes;
                    304:        if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) {
                    305:                /* XXX: this should not happen! */
                    306:                return;
                    307:        }
                    308:        allrouter = in6addr_linklocal_allrouters;
                    309:        if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) {
                    310:                /* XXX impossible */
                    311:                return;
                    312:        }
1.2       itojun    313:
1.22      itojun    314:        if (in6m->in6m_state == MLD_IREPORTEDLAST &&
1.29      rpaulo    315:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode)) &&
                    316:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) >
                    317:            IPV6_ADDR_SCOPE_INTFACELOCAL) {
1.31      rpaulo    318:                mld_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter);
1.29      rpaulo    319:        }
1.2       itojun    320: }
                    321:
                    322: void
1.38      christos  323: mld_input(struct mbuf *m, int off)
1.2       itojun    324: {
                    325:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    326:        struct mld_hdr *mldh;
1.2       itojun    327:        struct ifnet *ifp = m->m_pkthdr.rcvif;
1.31      rpaulo    328:        struct in6_multi *in6m = NULL;
1.29      rpaulo    329:        struct in6_addr mld_addr, all_in6;
1.2       itojun    330:        struct in6_ifaddr *ia;
1.31      rpaulo    331:        int timer = 0;          /* timer value in the MLD query header */
1.2       itojun    332:
1.22      itojun    333:        IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
1.13      itojun    334:        if (mldh == NULL) {
                    335:                icmp6stat.icp6s_tooshort++;
                    336:                return;
                    337:        }
                    338:
1.2       itojun    339:        /* source address validation */
1.13      itojun    340:        ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2       itojun    341:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.31      rpaulo    342:                /*
                    343:                 * RFC3590 allows the IPv6 unspecified address as the source
                    344:                 * address of MLD report and done messages.  However, as this
                    345:                 * same document says, this special rule is for snooping
                    346:                 * switches and the RFC requires routers to discard MLD packets
                    347:                 * with the unspecified source address.  The RFC only talks
                    348:                 * about hosts receiving an MLD query or report in Security
                    349:                 * Considerations, but this is probably the correct intention.
                    350:                 * RFC3590 does not talk about other cases than link-local and
                    351:                 * the unspecified source addresses, but we believe the same
                    352:                 * rule should be applied.
                    353:                 * As a result, we only allow link-local addresses as the
                    354:                 * source address; otherwise, simply discard the packet.
                    355:                 */
1.18      itojun    356: #if 0
1.31      rpaulo    357:                /*
                    358:                 * XXX: do not log in an input path to avoid log flooding,
                    359:                 * though RFC3590 says "SHOULD log" if the source of a query
                    360:                 * is the unspecified address.
                    361:                 */
                    362:                log(LOG_INFO,
1.22      itojun    363:                    "mld_input: src %s is not link-local (grp=%s)\n",
1.31      rpaulo    364:                    ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&mldh->mld_addr));
1.18      itojun    365: #endif
1.11      itojun    366:                m_freem(m);
1.2       itojun    367:                return;
                    368:        }
                    369:
                    370:        /*
1.29      rpaulo    371:         * make a copy for local work (in6_setscope() may modify the 1st arg)
                    372:         */
                    373:        mld_addr = mldh->mld_addr;
                    374:        if (in6_setscope(&mld_addr, ifp, NULL)) {
                    375:                /* XXX: this should not happen! */
                    376:                m_free(m);
                    377:                return;
                    378:        }
                    379:
                    380:        /*
1.31      rpaulo    381:         * In the MLD specification, there are 3 states and a flag.
1.2       itojun    382:         *
                    383:         * In Non-Listener state, we simply don't have a membership record.
                    384:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
1.31      rpaulo    385:         * In Idle Listener state, our timer is not running
                    386:         * (in6m->in6m_timer==IN6M_TIMER_UNDEF)
1.2       itojun    387:         *
1.22      itojun    388:         * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
                    389:         * we have heard a report from another member, or MLD_IREPORTEDLAST
1.2       itojun    390:         * if we sent the last report.
                    391:         */
1.22      itojun    392:        switch (mldh->mld_type) {
                    393:        case MLD_LISTENER_QUERY:
1.7       itojun    394:                if (ifp->if_flags & IFF_LOOPBACK)
                    395:                        break;
                    396:
1.29      rpaulo    397:                if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    398:                    !IN6_IS_ADDR_MULTICAST(&mld_addr))
1.7       itojun    399:                        break;  /* print error or log stat? */
1.29      rpaulo    400:
                    401:                all_in6 = in6addr_linklocal_allnodes;
                    402:                if (in6_setscope(&all_in6, ifp, NULL)) {
                    403:                        /* XXX: this should not happen! */
                    404:                        break;
                    405:                }
1.2       itojun    406:
1.7       itojun    407:                /*
1.11      itojun    408:                 * - Start the timers in all of our membership records
                    409:                 *   that the query applies to for the interface on
                    410:                 *   which the query arrived excl. those that belong
                    411:                 *   to the "all-nodes" group (ff02::1).
                    412:                 * - Restart any timer that is already running but has
1.30      rpaulo    413:                 *   a value longer than the requested timeout.
1.11      itojun    414:                 * - Use the value specified in the query message as
                    415:                 *   the maximum timeout.
                    416:                 */
1.31      rpaulo    417:                timer = ntohs(mldh->mld_maxdelay);
                    418:
1.7       itojun    419:                IFP_TO_IA6(ifp, ia);
                    420:                if (ia == NULL)
                    421:                        break;
1.2       itojun    422:
1.35      dyoung    423:                LIST_FOREACH(in6m, &ia->ia6_multiaddrs, in6m_entry) {
1.29      rpaulo    424:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.7       itojun    425:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
                    426:                            IPV6_ADDR_SCOPE_LINKLOCAL)
                    427:                                continue;
1.2       itojun    428:
1.31      rpaulo    429:                        if (in6m->in6m_state == MLD_REPORTPENDING)
                    430:                                continue; /* we are not yet ready */
                    431:
                    432:                        if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    433:                            !IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr))
                    434:                                continue;
                    435:
                    436:                        if (timer == 0) {
                    437:                                /* send a report immediately */
                    438:                                mld_stoptimer(in6m);
                    439:                                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    440:                                in6m->in6m_state = MLD_IREPORTEDLAST;
                    441:                        } else if (in6m->in6m_timer == IN6M_TIMER_UNDEF ||
                    442:                            mld_timerresid(in6m) > (u_long)timer) {
                    443:                                in6m->in6m_timer = arc4random() %
                    444:                                    (int)(((long)timer * hz) / 1000);
                    445:                                mld_starttimer(in6m);
1.7       itojun    446:                        }
                    447:                }
1.29      rpaulo    448:                break;
1.2       itojun    449:
1.22      itojun    450:        case MLD_LISTENER_REPORT:
1.2       itojun    451:                /*
1.11      itojun    452:                 * For fast leave to work, we have to know that we are the
                    453:                 * last person to send a report for this group.  Reports
                    454:                 * can potentially get looped back if we are a multicast
                    455:                 * router, so discard reports sourced by me.
                    456:                 * Note that it is impossible to check IFF_LOOPBACK flag of
                    457:                 * ifp for this purpose, since ip6_mloopback pass the physical
                    458:                 * interface to looutput.
                    459:                 */
1.7       itojun    460:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
                    461:                        break;
                    462:
1.22      itojun    463:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7       itojun    464:                        break;
                    465:
                    466:                /*
1.11      itojun    467:                 * If we belong to the group being reported, stop
                    468:                 * our timer for that group.
                    469:                 */
1.29      rpaulo    470:                IN6_LOOKUP_MULTI(mld_addr, ifp, in6m);
1.7       itojun    471:                if (in6m) {
1.31      rpaulo    472:                        mld_stoptimer(in6m); /* transit to idle state */
1.22      itojun    473:                        in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7       itojun    474:                }
                    475:                break;
                    476:        default:                /* this is impossible */
1.18      itojun    477: #if 0
1.19      itojun    478:                /*
                    479:                 * this case should be impossible because of filtering in
                    480:                 * icmp6_input().  But we explicitly disabled this part
                    481:                 * just in case.
                    482:                 */
1.31      rpaulo    483:                log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld_type);
1.18      itojun    484: #endif
1.7       itojun    485:                break;
1.2       itojun    486:        }
1.11      itojun    487:
                    488:        m_freem(m);
1.2       itojun    489: }
                    490:
                    491: static void
1.38      christos  492: mld_sendpkt(struct in6_multi *in6m, int type,
                    493:        const struct in6_addr *dst)
1.2       itojun    494: {
1.31      rpaulo    495:        struct mbuf *mh;
1.22      itojun    496:        struct mld_hdr *mldh;
1.31      rpaulo    497:        struct ip6_hdr *ip6 = NULL;
1.2       itojun    498:        struct ip6_moptions im6o;
1.31      rpaulo    499:        struct in6_ifaddr *ia = NULL;
1.2       itojun    500:        struct ifnet *ifp = in6m->in6m_ifp;
1.19      itojun    501:        int ignflags;
1.2       itojun    502:
                    503:        /*
                    504:         * At first, find a link local address on the outgoing interface
                    505:         * to use as the source address of the MLD packet.
1.19      itojun    506:         * We do not reject tentative addresses for MLD report to deal with
                    507:         * the case where we first join a link-local address.
1.2       itojun    508:         */
1.19      itojun    509:        ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
                    510:        if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
1.2       itojun    511:                return;
1.19      itojun    512:        if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
                    513:                ia = NULL;
1.2       itojun    514:
1.31      rpaulo    515:        /* Allocate two mbufs to store IPv6 header and MLD header */
                    516:        mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type);
                    517:        if (mldh == NULL)
1.2       itojun    518:                return;
                    519:
1.31      rpaulo    520:        /* fill src/dst here */
                    521:        ip6 = mtod(mh, struct ip6_hdr *);
                    522:        ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
                    523:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
1.2       itojun    524:
1.22      itojun    525:        mldh->mld_addr = in6m->in6m_addr;
1.29      rpaulo    526:        in6_clearscope(&mldh->mld_addr); /* XXX */
1.22      itojun    527:        mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
                    528:            sizeof(struct mld_hdr));
1.2       itojun    529:
                    530:        /* construct multicast option */
1.31      rpaulo    531:        memset(&im6o, 0, sizeof(im6o));
1.2       itojun    532:        im6o.im6o_multicast_ifp = ifp;
                    533:        im6o.im6o_multicast_hlim = 1;
                    534:
                    535:        /*
                    536:         * Request loopback of the report if we are acting as a multicast
                    537:         * router, so that the process-level routing daemon can hear it.
                    538:         */
                    539:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    540:
                    541:        /* increment output statictics */
                    542:        icmp6stat.icp6s_outhist[type]++;
1.15      itojun    543:        icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17      itojun    544:        switch (type) {
1.22      itojun    545:        case MLD_LISTENER_QUERY:
1.15      itojun    546:                icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
                    547:                break;
1.22      itojun    548:        case MLD_LISTENER_REPORT:
1.15      itojun    549:                icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
                    550:                break;
1.22      itojun    551:        case MLD_LISTENER_DONE:
1.15      itojun    552:                icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
                    553:                break;
1.7       itojun    554:        }
1.19      itojun    555:
1.27      perry     556:        ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC,
1.25      itojun    557:            &im6o, (struct socket *)NULL, NULL);
1.2       itojun    558: }
1.31      rpaulo    559:
                    560: static struct mld_hdr *
1.34      christos  561: mld_allocbuf(struct mbuf **mh, int len, struct in6_multi *in6m,
1.33      christos  562:     int type)
1.31      rpaulo    563: {
                    564:        struct mbuf *md;
                    565:        struct mld_hdr *mldh;
                    566:        struct ip6_hdr *ip6;
                    567:
                    568:        /*
                    569:         * Allocate mbufs to store ip6 header and MLD header.
                    570:         * We allocate 2 mbufs and make chain in advance because
                    571:         * it is more convenient when inserting the hop-by-hop option later.
                    572:         */
                    573:        MGETHDR(*mh, M_DONTWAIT, MT_HEADER);
                    574:        if (*mh == NULL)
                    575:                return NULL;
                    576:        MGET(md, M_DONTWAIT, MT_DATA);
                    577:        if (md == NULL) {
                    578:                m_free(*mh);
                    579:                *mh = NULL;
                    580:                return NULL;
                    581:        }
                    582:        (*mh)->m_next = md;
                    583:        md->m_next = NULL;
                    584:
                    585:        (*mh)->m_pkthdr.rcvif = NULL;
                    586:        (*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len;
                    587:        (*mh)->m_len = sizeof(struct ip6_hdr);
                    588:        MH_ALIGN(*mh, sizeof(struct ip6_hdr));
                    589:
                    590:        /* fill in the ip6 header */
                    591:        ip6 = mtod(*mh, struct ip6_hdr *);
                    592:        memset(ip6, 0, sizeof(*ip6));
                    593:        ip6->ip6_flow = 0;
                    594:        ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
                    595:        ip6->ip6_vfc |= IPV6_VERSION;
                    596:        /* ip6_plen will be set later */
                    597:        ip6->ip6_nxt = IPPROTO_ICMPV6;
                    598:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
                    599:        /* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */
                    600:
                    601:        /* fill in the MLD header as much as possible */
                    602:        md->m_len = len;
                    603:        mldh = mtod(md, struct mld_hdr *);
                    604:        memset(mldh, 0, len);
                    605:        mldh->mld_type = type;
                    606:        return mldh;
                    607: }
                    608:
                    609: /*
                    610:  * Add an address to the list of IP6 multicast addresses for a given interface.
                    611:  */
                    612: struct in6_multi *
1.38      christos  613: in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp,
                    614:        int *errorp, int timer)
1.31      rpaulo    615: {
                    616:        struct  in6_ifaddr *ia;
                    617:        struct  in6_ifreq ifr;
                    618:        struct  in6_multi *in6m;
                    619:        int     s = splsoftnet();
                    620:
                    621:        *errorp = 0;
                    622:
                    623:        /*
                    624:         * See if address already in list.
                    625:         */
                    626:        IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
                    627:        if (in6m != NULL) {
                    628:                /*
                    629:                 * Found it; just increment the refrence count.
                    630:                 */
                    631:                in6m->in6m_refcount++;
                    632:        } else {
                    633:                /*
                    634:                 * New address; allocate a new multicast record
                    635:                 * and link it into the interface's multicast list.
                    636:                 */
                    637:                in6m = (struct in6_multi *)
                    638:                        malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
                    639:                if (in6m == NULL) {
                    640:                        splx(s);
                    641:                        *errorp = ENOBUFS;
                    642:                        return (NULL);
                    643:                }
                    644:
                    645:                memset(in6m, 0, sizeof(*in6m));
                    646:                in6m->in6m_addr = *maddr6;
                    647:                in6m->in6m_ifp = ifp;
                    648:                in6m->in6m_refcount = 1;
                    649:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    650:                in6m->in6m_timer_ch =
                    651:                    malloc(sizeof(*in6m->in6m_timer_ch), M_IPMADDR, M_NOWAIT);
                    652:                if (in6m->in6m_timer_ch == NULL) {
                    653:                        free(in6m, M_IPMADDR);
                    654:                        splx(s);
                    655:                        return (NULL);
                    656:                }
                    657:                IFP_TO_IA6(ifp, ia);
                    658:                if (ia == NULL) {
1.36      dyoung    659:                        /* leaks in6m_timer_ch */
1.31      rpaulo    660:                        free(in6m, M_IPMADDR);
                    661:                        splx(s);
                    662:                        *errorp = EADDRNOTAVAIL; /* appropriate? */
                    663:                        return (NULL);
                    664:                }
                    665:                in6m->in6m_ia = ia;
                    666:                IFAREF(&ia->ia_ifa); /* gain a reference */
                    667:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    668:
                    669:                /*
                    670:                 * Ask the network driver to update its multicast reception
                    671:                 * filter appropriately for the new address.
                    672:                 */
1.39.6.1! jmcneill  673:                sockaddr_in6_init(&ifr.ifr_addr, maddr6, 0, 0, 0);
1.31      rpaulo    674:                if (ifp->if_ioctl == NULL)
                    675:                        *errorp = ENXIO; /* XXX: appropriate? */
                    676:                else
                    677:                        *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI,
1.37      christos  678:                            (void *)&ifr);
1.31      rpaulo    679:                if (*errorp) {
                    680:                        LIST_REMOVE(in6m, in6m_entry);
1.36      dyoung    681:                        /* leaks in6m_timer_ch */
1.31      rpaulo    682:                        free(in6m, M_IPMADDR);
                    683:                        IFAFREE(&ia->ia_ifa);
                    684:                        splx(s);
                    685:                        return (NULL);
                    686:                }
                    687:
1.39      ad        688:                callout_init(in6m->in6m_timer_ch, 0);
1.32      rpaulo    689:                in6m->in6m_timer = timer;
1.31      rpaulo    690:                if (in6m->in6m_timer > 0) {
                    691:                        in6m->in6m_state = MLD_REPORTPENDING;
                    692:                        mld_starttimer(in6m);
                    693:
                    694:                        splx(s);
                    695:                        return (in6m);
                    696:                }
                    697:
                    698:                /*
                    699:                 * Let MLD6 know that we have joined a new IP6 multicast
                    700:                 * group.
                    701:                 */
                    702:                mld_start_listening(in6m);
                    703:        }
                    704:        splx(s);
                    705:        return (in6m);
                    706: }
                    707:
                    708: /*
                    709:  * Delete a multicast address record.
                    710:  */
                    711: void
1.38      christos  712: in6_delmulti(struct in6_multi *in6m)
1.31      rpaulo    713: {
                    714:        struct  in6_ifreq ifr;
                    715:        struct  in6_ifaddr *ia;
                    716:        int     s = splsoftnet();
                    717:
                    718:        mld_stoptimer(in6m);
                    719:
                    720:        if (--in6m->in6m_refcount == 0) {
                    721:                /*
                    722:                 * No remaining claims to this record; let MLD6 know
                    723:                 * that we are leaving the multicast group.
                    724:                 */
                    725:                mld_stop_listening(in6m);
                    726:
                    727:                /*
                    728:                 * Unlink from list.
                    729:                 */
                    730:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    731:                if (in6m->in6m_ia != NULL) {
1.31      rpaulo    732:                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
1.35      dyoung    733:                        in6m->in6m_ia = NULL;
1.31      rpaulo    734:                }
                    735:
                    736:                /*
                    737:                 * Delete all references of this multicasting group from
                    738:                 * the membership arrays
                    739:                 */
                    740:                for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
                    741:                        struct in6_multi_mship *imm;
1.35      dyoung    742:                        LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) {
1.31      rpaulo    743:                                if (imm->i6mm_maddr == in6m)
                    744:                                        imm->i6mm_maddr = NULL;
                    745:                        }
                    746:                }
                    747:
                    748:                /*
                    749:                 * Notify the network driver to update its multicast
                    750:                 * reception filter.
                    751:                 */
1.39.6.1! jmcneill  752:                sockaddr_in6_init(&ifr.ifr_addr, &in6m->in6m_addr, 0, 0, 0);
1.31      rpaulo    753:                (*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp,
1.37      christos  754:                    SIOCDELMULTI, (void *)&ifr);
1.31      rpaulo    755:                free(in6m->in6m_timer_ch, M_IPMADDR);
                    756:                free(in6m, M_IPMADDR);
                    757:        }
                    758:        splx(s);
                    759: }
                    760:
                    761:
                    762: struct in6_multi_mship *
1.38      christos  763: in6_joingroup(struct ifnet *ifp, struct in6_addr *addr,
                    764:        int *errorp, int timer)
1.31      rpaulo    765: {
                    766:        struct in6_multi_mship *imm;
                    767:
                    768:        imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT);
                    769:        if (!imm) {
                    770:                *errorp = ENOBUFS;
                    771:                return NULL;
                    772:        }
                    773:
                    774:        memset(imm, 0, sizeof(*imm));
1.32      rpaulo    775:        imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, timer);
1.31      rpaulo    776:        if (!imm->i6mm_maddr) {
1.36      dyoung    777:                /* *errorp is already set */
1.31      rpaulo    778:                free(imm, M_IPMADDR);
                    779:                return NULL;
                    780:        }
                    781:        return imm;
                    782: }
                    783:
                    784: int
1.38      christos  785: in6_leavegroup(struct in6_multi_mship *imm)
1.31      rpaulo    786: {
                    787:
                    788:        if (imm->i6mm_maddr) {
                    789:                in6_delmulti(imm->i6mm_maddr);
                    790:        }
                    791:        free(imm, M_IPMADDR);
                    792:        return 0;
                    793: }
                    794:
                    795:
                    796: /*
                    797:  * Multicast address kludge:
                    798:  * If there were any multicast addresses attached to this interface address,
                    799:  * either move them to another address on this interface, or save them until
                    800:  * such time as this interface is reconfigured for IPv6.
                    801:  */
                    802: void
1.38      christos  803: in6_savemkludge(struct in6_ifaddr *oia)
1.31      rpaulo    804: {
                    805:        struct in6_ifaddr *ia;
1.36      dyoung    806:        struct in6_multi *in6m;
1.31      rpaulo    807:
                    808:        IFP_TO_IA6(oia->ia_ifp, ia);
                    809:        if (ia) {       /* there is another address */
1.36      dyoung    810:                KASSERT(ia != oia);
                    811:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    812:                        LIST_REMOVE(in6m, in6m_entry);
                    813:                        IFAREF(&ia->ia_ifa);
1.31      rpaulo    814:                        IFAFREE(&in6m->in6m_ia->ia_ifa);
                    815:                        in6m->in6m_ia = ia;
                    816:                        LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    817:                }
                    818:        } else {        /* last address on this if deleted, save */
                    819:                struct multi6_kludge *mk;
                    820:
1.35      dyoung    821:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    822:                        if (mk->mk_ifp == oia->ia_ifp)
                    823:                                break;
                    824:                }
                    825:                if (mk == NULL) /* this should not happen! */
                    826:                        panic("in6_savemkludge: no kludge space");
                    827:
1.36      dyoung    828:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    829:                        LIST_REMOVE(in6m, in6m_entry);
1.31      rpaulo    830:                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
                    831:                        in6m->in6m_ia = NULL;
                    832:                        LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
                    833:                }
                    834:        }
                    835: }
                    836:
                    837: /*
                    838:  * Continuation of multicast address hack:
                    839:  * If there was a multicast group list previously saved for this interface,
                    840:  * then we re-attach it to the first address configured on the i/f.
                    841:  */
                    842: void
1.38      christos  843: in6_restoremkludge(struct in6_ifaddr *ia, struct ifnet *ifp)
1.31      rpaulo    844: {
                    845:        struct multi6_kludge *mk;
1.36      dyoung    846:        struct in6_multi *in6m;
1.31      rpaulo    847:
1.35      dyoung    848:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    849:                if (mk->mk_ifp == ifp)
1.31      rpaulo    850:                        break;
                    851:        }
1.35      dyoung    852:        if (mk == NULL)
                    853:                return;
1.36      dyoung    854:        while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) {
                    855:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    856:                in6m->in6m_ia = ia;
                    857:                IFAREF(&ia->ia_ifa);
                    858:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    859:        }
1.31      rpaulo    860: }
                    861:
                    862: /*
                    863:  * Allocate space for the kludge at interface initialization time.
                    864:  * Formerly, we dynamically allocated the space in in6_savemkludge() with
                    865:  * malloc(M_WAITOK).  However, it was wrong since the function could be called
                    866:  * under an interrupt context (software timer on address lifetime expiration).
                    867:  * Also, we cannot just give up allocating the strucutre, since the group
                    868:  * membership structure is very complex and we need to keep it anyway.
                    869:  * Of course, this function MUST NOT be called under an interrupt context.
                    870:  * Specifically, it is expected to be called only from in6_ifattach(), though
                    871:  * it is a global function.
                    872:  */
                    873: void
1.38      christos  874: in6_createmkludge(struct ifnet *ifp)
1.31      rpaulo    875: {
                    876:        struct multi6_kludge *mk;
                    877:
1.35      dyoung    878:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    879:                /* If we've already had one, do not allocate. */
                    880:                if (mk->mk_ifp == ifp)
                    881:                        return;
                    882:        }
                    883:
                    884:        mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK);
                    885:
                    886:        memset(mk, 0, sizeof(*mk));
                    887:        LIST_INIT(&mk->mk_head);
                    888:        mk->mk_ifp = ifp;
                    889:        LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
                    890: }
                    891:
                    892: void
1.38      christos  893: in6_purgemkludge(struct ifnet *ifp)
1.31      rpaulo    894: {
                    895:        struct multi6_kludge *mk;
1.36      dyoung    896:        struct in6_multi *in6m, *next;
1.31      rpaulo    897:
1.35      dyoung    898:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    899:                if (mk->mk_ifp == ifp)
                    900:                        break;
                    901:        }
                    902:        if (mk == NULL)
                    903:                return;
                    904:
                    905:        /* leave from all multicast groups joined */
1.36      dyoung    906:        for (in6m = LIST_FIRST(&mk->mk_head); in6m != NULL; in6m = next) {
                    907:                next = LIST_NEXT(in6m, in6m_entry);
1.35      dyoung    908:                in6_delmulti(in6m);
1.31      rpaulo    909:        }
1.35      dyoung    910:        LIST_REMOVE(mk, mk_entry);
                    911:        free(mk, M_IPMADDR);
1.31      rpaulo    912: }

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