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Annotation of src/sys/netinet6/mld6.c, Revision 1.55.8.1

1.55.8.1! tls         1: /*     $NetBSD$        */
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>
1.55.8.1! tls       105: __KERNEL_RCSID(0, "$NetBSD$");
1.2       itojun    106:
                    107: #include "opt_inet.h"
                    108:
                    109: #include <sys/param.h>
                    110: #include <sys/systm.h>
                    111: #include <sys/mbuf.h>
                    112: #include <sys/socket.h>
1.45      ad        113: #include <sys/socketvar.h>
1.2       itojun    114: #include <sys/protosw.h>
                    115: #include <sys/syslog.h>
1.31      rpaulo    116: #include <sys/sysctl.h>
                    117: #include <sys/kernel.h>
                    118: #include <sys/callout.h>
1.55      tls       119: #include <sys/cprng.h>
1.2       itojun    120:
                    121: #include <net/if.h>
                    122:
                    123: #include <netinet/in.h>
                    124: #include <netinet/in_var.h>
1.31      rpaulo    125: #include <netinet6/in6_var.h>
1.10      itojun    126: #include <netinet/ip6.h>
1.2       itojun    127: #include <netinet6/ip6_var.h>
1.29      rpaulo    128: #include <netinet6/scope6_var.h>
1.10      itojun    129: #include <netinet/icmp6.h>
1.44      thorpej   130: #include <netinet6/icmp6_private.h>
1.2       itojun    131: #include <netinet6/mld6_var.h>
                    132:
1.7       itojun    133: #include <net/net_osdep.h>
                    134:
1.31      rpaulo    135:
                    136: /*
                    137:  * This structure is used to keep track of in6_multi chains which belong to
                    138:  * deleted interface addresses.
                    139:  */
1.55.8.1! tls       140: static LIST_HEAD(, multi6_kludge) in6_mk = LIST_HEAD_INITIALIZER(in6_mk);
1.31      rpaulo    141:
                    142: struct multi6_kludge {
                    143:        LIST_ENTRY(multi6_kludge) mk_entry;
                    144:        struct ifnet *mk_ifp;
                    145:        struct in6_multihead mk_head;
                    146: };
                    147:
                    148:
1.2       itojun    149: /*
                    150:  * Protocol constants
                    151:  */
                    152:
                    153: /*
                    154:  * time between repetitions of a node's initial report of interest in a
                    155:  * multicast address(in seconds)
                    156:  */
1.22      itojun    157: #define MLD_UNSOLICITED_REPORT_INTERVAL        10
1.2       itojun    158:
                    159: static struct ip6_pktopts ip6_opts;
                    160:
1.31      rpaulo    161: static void mld_start_listening(struct in6_multi *);
                    162: static void mld_stop_listening(struct in6_multi *);
                    163:
                    164: static struct mld_hdr * mld_allocbuf(struct mbuf **, int, struct in6_multi *,
                    165:        int);
                    166: static void mld_sendpkt(struct in6_multi *, int, const struct in6_addr *);
                    167: static void mld_starttimer(struct in6_multi *);
                    168: static void mld_stoptimer(struct in6_multi *);
                    169: static u_long mld_timerresid(struct in6_multi *);
1.2       itojun    170:
                    171: void
1.42      matt      172: mld_init(void)
1.2       itojun    173: {
                    174:        static u_int8_t hbh_buf[8];
                    175:        struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
                    176:        u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
                    177:
                    178:        /* ip6h_nxt will be fill in later */
1.11      itojun    179:        hbh->ip6h_len = 0;      /* (8 >> 3) - 1 */
1.2       itojun    180:
                    181:        /* XXX: grotty hard coding... */
                    182:        hbh_buf[2] = IP6OPT_PADN;       /* 2 byte padding */
                    183:        hbh_buf[3] = 0;
                    184:        hbh_buf[4] = IP6OPT_RTALERT;
                    185:        hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
1.50      tsutsui   186:        memcpy(&hbh_buf[6], (void *)&rtalert_code, sizeof(u_int16_t));
1.2       itojun    187:
                    188:        ip6_opts.ip6po_hbh = hbh;
                    189:        /* We will specify the hoplimit by a multicast option. */
                    190:        ip6_opts.ip6po_hlim = -1;
                    191: }
                    192:
1.31      rpaulo    193: static void
1.38      christos  194: mld_starttimer(struct in6_multi *in6m)
1.31      rpaulo    195: {
                    196:        struct timeval now;
                    197:
                    198:        microtime(&now);
                    199:        in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz;
                    200:        in6m->in6m_timer_expire.tv_usec = now.tv_usec +
                    201:            (in6m->in6m_timer % hz) * (1000000 / hz);
                    202:        if (in6m->in6m_timer_expire.tv_usec > 1000000) {
                    203:                in6m->in6m_timer_expire.tv_sec++;
                    204:                in6m->in6m_timer_expire.tv_usec -= 1000000;
                    205:        }
                    206:
                    207:        /* start or restart the timer */
1.41      joerg     208:        callout_schedule(&in6m->in6m_timer_ch, in6m->in6m_timer);
1.31      rpaulo    209: }
                    210:
                    211: static void
1.38      christos  212: mld_stoptimer(struct in6_multi *in6m)
1.31      rpaulo    213: {
                    214:        if (in6m->in6m_timer == IN6M_TIMER_UNDEF)
                    215:                return;
                    216:
1.41      joerg     217:        callout_stop(&in6m->in6m_timer_ch);
1.31      rpaulo    218:
                    219:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    220: }
                    221:
                    222: static void
1.41      joerg     223: mld_timeo(void *arg)
1.31      rpaulo    224: {
1.41      joerg     225:        struct in6_multi *in6m = arg;
1.45      ad        226:
                    227:        mutex_enter(softnet_lock);
                    228:        KERNEL_LOCK(1, NULL);
1.31      rpaulo    229:
                    230:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    231:
                    232:        switch (in6m->in6m_state) {
                    233:        case MLD_REPORTPENDING:
                    234:                mld_start_listening(in6m);
                    235:                break;
                    236:        default:
                    237:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    238:                break;
                    239:        }
                    240:
1.45      ad        241:        KERNEL_UNLOCK_ONE(NULL);
                    242:        mutex_exit(softnet_lock);
1.31      rpaulo    243: }
                    244:
                    245: static u_long
1.38      christos  246: mld_timerresid(struct in6_multi *in6m)
1.31      rpaulo    247: {
                    248:        struct timeval now, diff;
                    249:
                    250:        microtime(&now);
                    251:
                    252:        if (now.tv_sec > in6m->in6m_timer_expire.tv_sec ||
                    253:            (now.tv_sec == in6m->in6m_timer_expire.tv_sec &&
                    254:            now.tv_usec > in6m->in6m_timer_expire.tv_usec)) {
                    255:                return (0);
                    256:        }
                    257:        diff = in6m->in6m_timer_expire;
                    258:        diff.tv_sec -= now.tv_sec;
                    259:        diff.tv_usec -= now.tv_usec;
                    260:        if (diff.tv_usec < 0) {
                    261:                diff.tv_sec--;
                    262:                diff.tv_usec += 1000000;
                    263:        }
                    264:
                    265:        /* return the remaining time in milliseconds */
1.47      adrianp   266:        return diff.tv_sec * 1000 + diff.tv_usec / 1000;
1.31      rpaulo    267: }
                    268:
                    269: static void
1.38      christos  270: mld_start_listening(struct in6_multi *in6m)
1.2       itojun    271: {
1.29      rpaulo    272:        struct in6_addr all_in6;
                    273:
1.2       itojun    274:        /*
1.11      itojun    275:         * RFC2710 page 10:
1.2       itojun    276:         * The node never sends a Report or Done for the link-scope all-nodes
                    277:         * address.
                    278:         * MLD messages are never sent for multicast addresses whose scope is 0
                    279:         * (reserved) or 1 (node-local).
                    280:         */
1.29      rpaulo    281:        all_in6 = in6addr_linklocal_allnodes;
                    282:        if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) {
                    283:                /* XXX: this should not happen! */
                    284:                in6m->in6m_timer = 0;
                    285:                in6m->in6m_state = MLD_OTHERLISTENER;
                    286:        }
                    287:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.2       itojun    288:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
1.31      rpaulo    289:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.22      itojun    290:                in6m->in6m_state = MLD_OTHERLISTENER;
1.2       itojun    291:        } else {
1.31      rpaulo    292:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
1.55      tls       293:                in6m->in6m_timer = cprng_fast32() %
1.31      rpaulo    294:                    (MLD_UNSOLICITED_REPORT_INTERVAL * hz);
1.22      itojun    295:                in6m->in6m_state = MLD_IREPORTEDLAST;
1.31      rpaulo    296:
                    297:                mld_starttimer(in6m);
1.2       itojun    298:        }
                    299: }
                    300:
1.31      rpaulo    301: static void
1.38      christos  302: mld_stop_listening(struct in6_multi *in6m)
1.2       itojun    303: {
1.29      rpaulo    304:        struct in6_addr allnode, allrouter;
                    305:
                    306:        allnode = in6addr_linklocal_allnodes;
                    307:        if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) {
                    308:                /* XXX: this should not happen! */
                    309:                return;
                    310:        }
                    311:        allrouter = in6addr_linklocal_allrouters;
                    312:        if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) {
                    313:                /* XXX impossible */
                    314:                return;
                    315:        }
1.2       itojun    316:
1.22      itojun    317:        if (in6m->in6m_state == MLD_IREPORTEDLAST &&
1.29      rpaulo    318:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode)) &&
                    319:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) >
                    320:            IPV6_ADDR_SCOPE_INTFACELOCAL) {
1.31      rpaulo    321:                mld_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter);
1.29      rpaulo    322:        }
1.2       itojun    323: }
                    324:
                    325: void
1.38      christos  326: mld_input(struct mbuf *m, int off)
1.2       itojun    327: {
1.52      dholland  328:        struct ip6_hdr *ip6;
1.22      itojun    329:        struct mld_hdr *mldh;
1.2       itojun    330:        struct ifnet *ifp = m->m_pkthdr.rcvif;
1.31      rpaulo    331:        struct in6_multi *in6m = NULL;
1.29      rpaulo    332:        struct in6_addr mld_addr, all_in6;
1.2       itojun    333:        struct in6_ifaddr *ia;
1.47      adrianp   334:        u_long timer = 0;       /* timer value in the MLD query header */
1.2       itojun    335:
1.22      itojun    336:        IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
1.13      itojun    337:        if (mldh == NULL) {
1.44      thorpej   338:                ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1.13      itojun    339:                return;
                    340:        }
                    341:
1.2       itojun    342:        /* source address validation */
1.13      itojun    343:        ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2       itojun    344:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.31      rpaulo    345:                /*
                    346:                 * RFC3590 allows the IPv6 unspecified address as the source
                    347:                 * address of MLD report and done messages.  However, as this
                    348:                 * same document says, this special rule is for snooping
                    349:                 * switches and the RFC requires routers to discard MLD packets
                    350:                 * with the unspecified source address.  The RFC only talks
                    351:                 * about hosts receiving an MLD query or report in Security
                    352:                 * Considerations, but this is probably the correct intention.
                    353:                 * RFC3590 does not talk about other cases than link-local and
                    354:                 * the unspecified source addresses, but we believe the same
                    355:                 * rule should be applied.
                    356:                 * As a result, we only allow link-local addresses as the
                    357:                 * source address; otherwise, simply discard the packet.
                    358:                 */
1.18      itojun    359: #if 0
1.31      rpaulo    360:                /*
                    361:                 * XXX: do not log in an input path to avoid log flooding,
                    362:                 * though RFC3590 says "SHOULD log" if the source of a query
                    363:                 * is the unspecified address.
                    364:                 */
                    365:                log(LOG_INFO,
1.22      itojun    366:                    "mld_input: src %s is not link-local (grp=%s)\n",
1.31      rpaulo    367:                    ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&mldh->mld_addr));
1.18      itojun    368: #endif
1.11      itojun    369:                m_freem(m);
1.2       itojun    370:                return;
                    371:        }
                    372:
                    373:        /*
1.29      rpaulo    374:         * make a copy for local work (in6_setscope() may modify the 1st arg)
                    375:         */
                    376:        mld_addr = mldh->mld_addr;
                    377:        if (in6_setscope(&mld_addr, ifp, NULL)) {
                    378:                /* XXX: this should not happen! */
                    379:                m_free(m);
                    380:                return;
                    381:        }
                    382:
                    383:        /*
1.31      rpaulo    384:         * In the MLD specification, there are 3 states and a flag.
1.2       itojun    385:         *
                    386:         * In Non-Listener state, we simply don't have a membership record.
                    387:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
1.31      rpaulo    388:         * In Idle Listener state, our timer is not running
                    389:         * (in6m->in6m_timer==IN6M_TIMER_UNDEF)
1.2       itojun    390:         *
1.22      itojun    391:         * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
                    392:         * we have heard a report from another member, or MLD_IREPORTEDLAST
1.2       itojun    393:         * if we sent the last report.
                    394:         */
1.22      itojun    395:        switch (mldh->mld_type) {
                    396:        case MLD_LISTENER_QUERY:
1.7       itojun    397:                if (ifp->if_flags & IFF_LOOPBACK)
                    398:                        break;
                    399:
1.29      rpaulo    400:                if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    401:                    !IN6_IS_ADDR_MULTICAST(&mld_addr))
1.7       itojun    402:                        break;  /* print error or log stat? */
1.29      rpaulo    403:
                    404:                all_in6 = in6addr_linklocal_allnodes;
                    405:                if (in6_setscope(&all_in6, ifp, NULL)) {
                    406:                        /* XXX: this should not happen! */
                    407:                        break;
                    408:                }
1.2       itojun    409:
1.7       itojun    410:                /*
1.11      itojun    411:                 * - Start the timers in all of our membership records
                    412:                 *   that the query applies to for the interface on
                    413:                 *   which the query arrived excl. those that belong
                    414:                 *   to the "all-nodes" group (ff02::1).
                    415:                 * - Restart any timer that is already running but has
1.30      rpaulo    416:                 *   a value longer than the requested timeout.
1.11      itojun    417:                 * - Use the value specified in the query message as
                    418:                 *   the maximum timeout.
                    419:                 */
1.31      rpaulo    420:                timer = ntohs(mldh->mld_maxdelay);
                    421:
1.7       itojun    422:                IFP_TO_IA6(ifp, ia);
                    423:                if (ia == NULL)
                    424:                        break;
1.2       itojun    425:
1.35      dyoung    426:                LIST_FOREACH(in6m, &ia->ia6_multiaddrs, in6m_entry) {
1.29      rpaulo    427:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.7       itojun    428:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
                    429:                            IPV6_ADDR_SCOPE_LINKLOCAL)
                    430:                                continue;
1.2       itojun    431:
1.31      rpaulo    432:                        if (in6m->in6m_state == MLD_REPORTPENDING)
                    433:                                continue; /* we are not yet ready */
                    434:
                    435:                        if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    436:                            !IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr))
                    437:                                continue;
                    438:
                    439:                        if (timer == 0) {
                    440:                                /* send a report immediately */
                    441:                                mld_stoptimer(in6m);
                    442:                                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    443:                                in6m->in6m_state = MLD_IREPORTEDLAST;
                    444:                        } else if (in6m->in6m_timer == IN6M_TIMER_UNDEF ||
1.47      adrianp   445:                            mld_timerresid(in6m) > timer) {
                    446:                                in6m->in6m_timer =
1.55      tls       447:                                   1 + (cprng_fast32() % timer) * hz / 1000;
1.31      rpaulo    448:                                mld_starttimer(in6m);
1.7       itojun    449:                        }
                    450:                }
1.29      rpaulo    451:                break;
1.2       itojun    452:
1.22      itojun    453:        case MLD_LISTENER_REPORT:
1.2       itojun    454:                /*
1.11      itojun    455:                 * For fast leave to work, we have to know that we are the
                    456:                 * last person to send a report for this group.  Reports
                    457:                 * can potentially get looped back if we are a multicast
                    458:                 * router, so discard reports sourced by me.
                    459:                 * Note that it is impossible to check IFF_LOOPBACK flag of
                    460:                 * ifp for this purpose, since ip6_mloopback pass the physical
                    461:                 * interface to looutput.
                    462:                 */
1.7       itojun    463:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
                    464:                        break;
                    465:
1.22      itojun    466:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7       itojun    467:                        break;
                    468:
                    469:                /*
1.11      itojun    470:                 * If we belong to the group being reported, stop
                    471:                 * our timer for that group.
                    472:                 */
1.29      rpaulo    473:                IN6_LOOKUP_MULTI(mld_addr, ifp, in6m);
1.7       itojun    474:                if (in6m) {
1.31      rpaulo    475:                        mld_stoptimer(in6m); /* transit to idle state */
1.22      itojun    476:                        in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7       itojun    477:                }
                    478:                break;
                    479:        default:                /* this is impossible */
1.18      itojun    480: #if 0
1.19      itojun    481:                /*
                    482:                 * this case should be impossible because of filtering in
                    483:                 * icmp6_input().  But we explicitly disabled this part
                    484:                 * just in case.
                    485:                 */
1.31      rpaulo    486:                log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld_type);
1.18      itojun    487: #endif
1.7       itojun    488:                break;
1.2       itojun    489:        }
1.11      itojun    490:
                    491:        m_freem(m);
1.2       itojun    492: }
                    493:
                    494: static void
1.38      christos  495: mld_sendpkt(struct in6_multi *in6m, int type,
                    496:        const struct in6_addr *dst)
1.2       itojun    497: {
1.31      rpaulo    498:        struct mbuf *mh;
1.22      itojun    499:        struct mld_hdr *mldh;
1.31      rpaulo    500:        struct ip6_hdr *ip6 = NULL;
1.2       itojun    501:        struct ip6_moptions im6o;
1.31      rpaulo    502:        struct in6_ifaddr *ia = NULL;
1.2       itojun    503:        struct ifnet *ifp = in6m->in6m_ifp;
1.19      itojun    504:        int ignflags;
1.2       itojun    505:
                    506:        /*
                    507:         * At first, find a link local address on the outgoing interface
                    508:         * to use as the source address of the MLD packet.
1.19      itojun    509:         * We do not reject tentative addresses for MLD report to deal with
                    510:         * the case where we first join a link-local address.
1.2       itojun    511:         */
1.19      itojun    512:        ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
                    513:        if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
1.2       itojun    514:                return;
1.19      itojun    515:        if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
                    516:                ia = NULL;
1.2       itojun    517:
1.31      rpaulo    518:        /* Allocate two mbufs to store IPv6 header and MLD header */
                    519:        mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type);
                    520:        if (mldh == NULL)
1.2       itojun    521:                return;
                    522:
1.31      rpaulo    523:        /* fill src/dst here */
                    524:        ip6 = mtod(mh, struct ip6_hdr *);
                    525:        ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
                    526:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
1.2       itojun    527:
1.22      itojun    528:        mldh->mld_addr = in6m->in6m_addr;
1.29      rpaulo    529:        in6_clearscope(&mldh->mld_addr); /* XXX */
1.22      itojun    530:        mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
                    531:            sizeof(struct mld_hdr));
1.2       itojun    532:
                    533:        /* construct multicast option */
1.31      rpaulo    534:        memset(&im6o, 0, sizeof(im6o));
1.2       itojun    535:        im6o.im6o_multicast_ifp = ifp;
                    536:        im6o.im6o_multicast_hlim = 1;
                    537:
                    538:        /*
                    539:         * Request loopback of the report if we are acting as a multicast
                    540:         * router, so that the process-level routing daemon can hear it.
                    541:         */
                    542:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    543:
                    544:        /* increment output statictics */
1.44      thorpej   545:        ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
1.15      itojun    546:        icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17      itojun    547:        switch (type) {
1.22      itojun    548:        case MLD_LISTENER_QUERY:
1.15      itojun    549:                icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
                    550:                break;
1.22      itojun    551:        case MLD_LISTENER_REPORT:
1.15      itojun    552:                icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
                    553:                break;
1.22      itojun    554:        case MLD_LISTENER_DONE:
1.15      itojun    555:                icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
                    556:                break;
1.7       itojun    557:        }
1.19      itojun    558:
1.27      perry     559:        ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC,
1.53      plunky    560:            &im6o, NULL, NULL);
1.2       itojun    561: }
1.31      rpaulo    562:
                    563: static struct mld_hdr *
1.34      christos  564: mld_allocbuf(struct mbuf **mh, int len, struct in6_multi *in6m,
1.33      christos  565:     int type)
1.31      rpaulo    566: {
                    567:        struct mbuf *md;
                    568:        struct mld_hdr *mldh;
                    569:        struct ip6_hdr *ip6;
                    570:
                    571:        /*
                    572:         * Allocate mbufs to store ip6 header and MLD header.
                    573:         * We allocate 2 mbufs and make chain in advance because
                    574:         * it is more convenient when inserting the hop-by-hop option later.
                    575:         */
                    576:        MGETHDR(*mh, M_DONTWAIT, MT_HEADER);
                    577:        if (*mh == NULL)
                    578:                return NULL;
                    579:        MGET(md, M_DONTWAIT, MT_DATA);
                    580:        if (md == NULL) {
                    581:                m_free(*mh);
                    582:                *mh = NULL;
                    583:                return NULL;
                    584:        }
                    585:        (*mh)->m_next = md;
                    586:        md->m_next = NULL;
                    587:
                    588:        (*mh)->m_pkthdr.rcvif = NULL;
                    589:        (*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len;
                    590:        (*mh)->m_len = sizeof(struct ip6_hdr);
                    591:        MH_ALIGN(*mh, sizeof(struct ip6_hdr));
                    592:
                    593:        /* fill in the ip6 header */
                    594:        ip6 = mtod(*mh, struct ip6_hdr *);
                    595:        memset(ip6, 0, sizeof(*ip6));
                    596:        ip6->ip6_flow = 0;
                    597:        ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
                    598:        ip6->ip6_vfc |= IPV6_VERSION;
                    599:        /* ip6_plen will be set later */
                    600:        ip6->ip6_nxt = IPPROTO_ICMPV6;
                    601:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
                    602:        /* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */
                    603:
                    604:        /* fill in the MLD header as much as possible */
                    605:        md->m_len = len;
                    606:        mldh = mtod(md, struct mld_hdr *);
                    607:        memset(mldh, 0, len);
                    608:        mldh->mld_type = type;
                    609:        return mldh;
                    610: }
                    611:
                    612: /*
                    613:  * Add an address to the list of IP6 multicast addresses for a given interface.
                    614:  */
                    615: struct in6_multi *
1.38      christos  616: in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp,
                    617:        int *errorp, int timer)
1.31      rpaulo    618: {
                    619:        struct  in6_ifaddr *ia;
1.54      dyoung    620:        struct  sockaddr_in6 sin6;
1.31      rpaulo    621:        struct  in6_multi *in6m;
                    622:        int     s = splsoftnet();
                    623:
                    624:        *errorp = 0;
                    625:
                    626:        /*
                    627:         * See if address already in list.
                    628:         */
                    629:        IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
                    630:        if (in6m != NULL) {
                    631:                /*
                    632:                 * Found it; just increment the refrence count.
                    633:                 */
                    634:                in6m->in6m_refcount++;
                    635:        } else {
                    636:                /*
                    637:                 * New address; allocate a new multicast record
                    638:                 * and link it into the interface's multicast list.
                    639:                 */
                    640:                in6m = (struct in6_multi *)
1.51      dyoung    641:                        malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT|M_ZERO);
1.31      rpaulo    642:                if (in6m == NULL) {
                    643:                        splx(s);
                    644:                        *errorp = ENOBUFS;
                    645:                        return (NULL);
                    646:                }
                    647:
                    648:                in6m->in6m_addr = *maddr6;
                    649:                in6m->in6m_ifp = ifp;
                    650:                in6m->in6m_refcount = 1;
                    651:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    652:                IFP_TO_IA6(ifp, ia);
                    653:                if (ia == NULL) {
                    654:                        free(in6m, M_IPMADDR);
                    655:                        splx(s);
                    656:                        *errorp = EADDRNOTAVAIL; /* appropriate? */
                    657:                        return (NULL);
                    658:                }
                    659:                in6m->in6m_ia = ia;
                    660:                IFAREF(&ia->ia_ifa); /* gain a reference */
                    661:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    662:
                    663:                /*
                    664:                 * Ask the network driver to update its multicast reception
                    665:                 * filter appropriately for the new address.
                    666:                 */
1.54      dyoung    667:                sockaddr_in6_init(&sin6, maddr6, 0, 0, 0);
                    668:                *errorp = if_mcast_op(ifp, SIOCADDMULTI, sin6tosa(&sin6));
1.31      rpaulo    669:                if (*errorp) {
                    670:                        LIST_REMOVE(in6m, in6m_entry);
                    671:                        free(in6m, M_IPMADDR);
                    672:                        IFAFREE(&ia->ia_ifa);
                    673:                        splx(s);
                    674:                        return (NULL);
                    675:                }
                    676:
1.45      ad        677:                callout_init(&in6m->in6m_timer_ch, CALLOUT_MPSAFE);
1.41      joerg     678:                callout_setfunc(&in6m->in6m_timer_ch, mld_timeo, in6m);
1.32      rpaulo    679:                in6m->in6m_timer = timer;
1.31      rpaulo    680:                if (in6m->in6m_timer > 0) {
                    681:                        in6m->in6m_state = MLD_REPORTPENDING;
                    682:                        mld_starttimer(in6m);
                    683:
                    684:                        splx(s);
                    685:                        return (in6m);
                    686:                }
                    687:
                    688:                /*
                    689:                 * Let MLD6 know that we have joined a new IP6 multicast
                    690:                 * group.
                    691:                 */
                    692:                mld_start_listening(in6m);
                    693:        }
                    694:        splx(s);
                    695:        return (in6m);
                    696: }
                    697:
                    698: /*
                    699:  * Delete a multicast address record.
                    700:  */
                    701: void
1.38      christos  702: in6_delmulti(struct in6_multi *in6m)
1.31      rpaulo    703: {
1.54      dyoung    704:        struct  sockaddr_in6 sin6;
1.31      rpaulo    705:        struct  in6_ifaddr *ia;
                    706:        int     s = splsoftnet();
                    707:
                    708:        mld_stoptimer(in6m);
                    709:
                    710:        if (--in6m->in6m_refcount == 0) {
                    711:                /*
                    712:                 * No remaining claims to this record; let MLD6 know
                    713:                 * that we are leaving the multicast group.
                    714:                 */
                    715:                mld_stop_listening(in6m);
                    716:
                    717:                /*
                    718:                 * Unlink from list.
                    719:                 */
                    720:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    721:                if (in6m->in6m_ia != NULL) {
1.31      rpaulo    722:                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
1.35      dyoung    723:                        in6m->in6m_ia = NULL;
1.31      rpaulo    724:                }
                    725:
                    726:                /*
                    727:                 * Delete all references of this multicasting group from
                    728:                 * the membership arrays
                    729:                 */
                    730:                for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
                    731:                        struct in6_multi_mship *imm;
1.35      dyoung    732:                        LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) {
1.31      rpaulo    733:                                if (imm->i6mm_maddr == in6m)
                    734:                                        imm->i6mm_maddr = NULL;
                    735:                        }
                    736:                }
                    737:
                    738:                /*
                    739:                 * Notify the network driver to update its multicast
                    740:                 * reception filter.
                    741:                 */
1.54      dyoung    742:                sockaddr_in6_init(&sin6, &in6m->in6m_addr, 0, 0, 0);
                    743:                if_mcast_op(in6m->in6m_ifp, SIOCDELMULTI, sin6tosa(&sin6));
1.41      joerg     744:                callout_destroy(&in6m->in6m_timer_ch);
1.31      rpaulo    745:                free(in6m, M_IPMADDR);
                    746:        }
                    747:        splx(s);
                    748: }
                    749:
                    750:
                    751: struct in6_multi_mship *
1.38      christos  752: in6_joingroup(struct ifnet *ifp, struct in6_addr *addr,
                    753:        int *errorp, int timer)
1.31      rpaulo    754: {
                    755:        struct in6_multi_mship *imm;
                    756:
1.51      dyoung    757:        imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT|M_ZERO);
                    758:        if (imm == NULL) {
1.31      rpaulo    759:                *errorp = ENOBUFS;
                    760:                return NULL;
                    761:        }
                    762:
1.32      rpaulo    763:        imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, timer);
1.31      rpaulo    764:        if (!imm->i6mm_maddr) {
1.36      dyoung    765:                /* *errorp is already set */
1.31      rpaulo    766:                free(imm, M_IPMADDR);
                    767:                return NULL;
                    768:        }
                    769:        return imm;
                    770: }
                    771:
                    772: int
1.38      christos  773: in6_leavegroup(struct in6_multi_mship *imm)
1.31      rpaulo    774: {
                    775:
                    776:        if (imm->i6mm_maddr) {
                    777:                in6_delmulti(imm->i6mm_maddr);
                    778:        }
                    779:        free(imm, M_IPMADDR);
                    780:        return 0;
                    781: }
                    782:
                    783:
                    784: /*
                    785:  * Multicast address kludge:
                    786:  * If there were any multicast addresses attached to this interface address,
                    787:  * either move them to another address on this interface, or save them until
                    788:  * such time as this interface is reconfigured for IPv6.
                    789:  */
                    790: void
1.38      christos  791: in6_savemkludge(struct in6_ifaddr *oia)
1.31      rpaulo    792: {
                    793:        struct in6_ifaddr *ia;
1.36      dyoung    794:        struct in6_multi *in6m;
1.31      rpaulo    795:
                    796:        IFP_TO_IA6(oia->ia_ifp, ia);
                    797:        if (ia) {       /* there is another address */
1.36      dyoung    798:                KASSERT(ia != oia);
                    799:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    800:                        LIST_REMOVE(in6m, in6m_entry);
                    801:                        IFAREF(&ia->ia_ifa);
1.31      rpaulo    802:                        IFAFREE(&in6m->in6m_ia->ia_ifa);
                    803:                        in6m->in6m_ia = ia;
                    804:                        LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    805:                }
                    806:        } else {        /* last address on this if deleted, save */
                    807:                struct multi6_kludge *mk;
                    808:
1.35      dyoung    809:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    810:                        if (mk->mk_ifp == oia->ia_ifp)
                    811:                                break;
                    812:                }
                    813:                if (mk == NULL) /* this should not happen! */
                    814:                        panic("in6_savemkludge: no kludge space");
                    815:
1.36      dyoung    816:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    817:                        LIST_REMOVE(in6m, in6m_entry);
1.31      rpaulo    818:                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
                    819:                        in6m->in6m_ia = NULL;
                    820:                        LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
                    821:                }
                    822:        }
                    823: }
                    824:
                    825: /*
                    826:  * Continuation of multicast address hack:
                    827:  * If there was a multicast group list previously saved for this interface,
                    828:  * then we re-attach it to the first address configured on the i/f.
                    829:  */
                    830: void
1.38      christos  831: in6_restoremkludge(struct in6_ifaddr *ia, struct ifnet *ifp)
1.31      rpaulo    832: {
                    833:        struct multi6_kludge *mk;
1.36      dyoung    834:        struct in6_multi *in6m;
1.31      rpaulo    835:
1.35      dyoung    836:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    837:                if (mk->mk_ifp == ifp)
1.31      rpaulo    838:                        break;
                    839:        }
1.35      dyoung    840:        if (mk == NULL)
                    841:                return;
1.36      dyoung    842:        while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) {
                    843:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    844:                in6m->in6m_ia = ia;
                    845:                IFAREF(&ia->ia_ifa);
                    846:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    847:        }
1.31      rpaulo    848: }
                    849:
                    850: /*
                    851:  * Allocate space for the kludge at interface initialization time.
                    852:  * Formerly, we dynamically allocated the space in in6_savemkludge() with
                    853:  * malloc(M_WAITOK).  However, it was wrong since the function could be called
                    854:  * under an interrupt context (software timer on address lifetime expiration).
                    855:  * Also, we cannot just give up allocating the strucutre, since the group
                    856:  * membership structure is very complex and we need to keep it anyway.
                    857:  * Of course, this function MUST NOT be called under an interrupt context.
                    858:  * Specifically, it is expected to be called only from in6_ifattach(), though
                    859:  * it is a global function.
                    860:  */
                    861: void
1.38      christos  862: in6_createmkludge(struct ifnet *ifp)
1.31      rpaulo    863: {
                    864:        struct multi6_kludge *mk;
                    865:
1.35      dyoung    866:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    867:                /* If we've already had one, do not allocate. */
                    868:                if (mk->mk_ifp == ifp)
                    869:                        return;
                    870:        }
                    871:
1.51      dyoung    872:        mk = malloc(sizeof(*mk), M_IPMADDR, M_ZERO|M_WAITOK);
1.31      rpaulo    873:
                    874:        LIST_INIT(&mk->mk_head);
                    875:        mk->mk_ifp = ifp;
                    876:        LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
                    877: }
                    878:
                    879: void
1.38      christos  880: in6_purgemkludge(struct ifnet *ifp)
1.31      rpaulo    881: {
                    882:        struct multi6_kludge *mk;
1.36      dyoung    883:        struct in6_multi *in6m, *next;
1.31      rpaulo    884:
1.35      dyoung    885:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    886:                if (mk->mk_ifp == ifp)
                    887:                        break;
                    888:        }
                    889:        if (mk == NULL)
                    890:                return;
                    891:
                    892:        /* leave from all multicast groups joined */
1.36      dyoung    893:        for (in6m = LIST_FIRST(&mk->mk_head); in6m != NULL; in6m = next) {
                    894:                next = LIST_NEXT(in6m, in6m_entry);
1.35      dyoung    895:                in6_delmulti(in6m);
1.31      rpaulo    896:        }
1.35      dyoung    897:        LIST_REMOVE(mk, mk_entry);
                    898:        free(mk, M_IPMADDR);
1.31      rpaulo    899: }
1.55.8.1! tls       900:
        !           901: static int
        !           902: in6_mkludge_sysctl(SYSCTLFN_ARGS)
        !           903: {
        !           904:        struct multi6_kludge *mk;
        !           905:        struct in6_multi *in6m;
        !           906:        int error;
        !           907:        uint32_t tmp;
        !           908:        size_t written;
        !           909:
        !           910:        if (namelen != 1)
        !           911:                return EINVAL;
        !           912:
        !           913:        if (oldp == NULL) {
        !           914:                *oldlenp = 0;
        !           915:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
        !           916:                        if (mk->mk_ifp->if_index == name[0])
        !           917:                                continue;
        !           918:                        LIST_FOREACH(in6m, &mk->mk_head, in6m_entry) {
        !           919:                                *oldlenp += sizeof(struct in6_addr) +
        !           920:                                    sizeof(uint32_t);
        !           921:                        }
        !           922:                }
        !           923:                return 0;
        !           924:        }
        !           925:
        !           926:        error = 0;
        !           927:        written = 0;
        !           928:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
        !           929:                if (mk->mk_ifp->if_index == name[0])
        !           930:                        continue;
        !           931:                LIST_FOREACH(in6m, &mk->mk_head, in6m_entry) {
        !           932:                        if (written + sizeof(struct in6_addr) +
        !           933:                            sizeof(uint32_t) > *oldlenp)
        !           934:                                goto done;
        !           935:                        error = sysctl_copyout(l, &in6m->in6m_addr,
        !           936:                            oldp, sizeof(struct in6_addr));
        !           937:                        if (error)
        !           938:                                goto done;
        !           939:                        oldp = (char *)oldp + sizeof(struct in6_addr);
        !           940:                        written += sizeof(struct in6_addr);
        !           941:                        tmp = in6m->in6m_refcount;
        !           942:                        error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
        !           943:                        if (error)
        !           944:                                goto done;
        !           945:                        oldp = (char *)oldp + sizeof(tmp);
        !           946:                        written += sizeof(tmp);
        !           947:                }
        !           948:        }
        !           949:
        !           950: done:
        !           951:        *oldlenp = written;
        !           952:        return error;
        !           953: }
        !           954:
        !           955: static int
        !           956: in6_multicast_sysctl(SYSCTLFN_ARGS)
        !           957: {
        !           958:        struct ifnet *ifp;
        !           959:        struct ifaddr *ifa;
        !           960:        struct in6_ifaddr *ifa6;
        !           961:        struct in6_multi *in6m;
        !           962:        uint32_t tmp;
        !           963:        int error;
        !           964:        size_t written;
        !           965:
        !           966:        if (namelen != 1)
        !           967:                return EINVAL;
        !           968:
        !           969:        ifp = if_byindex(name[0]);
        !           970:        if (ifp == NULL)
        !           971:                return ENODEV;
        !           972:
        !           973:        if (oldp == NULL) {
        !           974:                *oldlenp = 0;
        !           975:                IFADDR_FOREACH(ifa, ifp) {
        !           976:                        if (ifa->ifa_addr == NULL)
        !           977:                                continue;
        !           978:                        if (ifa->ifa_addr->sa_family != AF_INET6)
        !           979:                                continue;
        !           980:                        ifa6 = (struct in6_ifaddr *)ifa;
        !           981:                        LIST_FOREACH(in6m, &ifa6->ia6_multiaddrs, in6m_entry) {
        !           982:                                *oldlenp += 2 * sizeof(struct in6_addr) +
        !           983:                                    sizeof(uint32_t);
        !           984:                        }
        !           985:                }
        !           986:                return 0;
        !           987:        }
        !           988:
        !           989:        error = 0;
        !           990:        written = 0;
        !           991:        IFADDR_FOREACH(ifa, ifp) {
        !           992:                if (ifa->ifa_addr == NULL)
        !           993:                        continue;
        !           994:                if (ifa->ifa_addr->sa_family != AF_INET6)
        !           995:                        continue;
        !           996:                ifa6 = (struct in6_ifaddr *)ifa;
        !           997:                LIST_FOREACH(in6m, &ifa6->ia6_multiaddrs, in6m_entry) {
        !           998:                        if (written + 2 * sizeof(struct in6_addr) +
        !           999:                            sizeof(uint32_t) > *oldlenp)
        !          1000:                                goto done;
        !          1001:                        error = sysctl_copyout(l, &ifa6->ia_addr.sin6_addr,
        !          1002:                            oldp, sizeof(struct in6_addr));
        !          1003:                        if (error)
        !          1004:                                goto done;
        !          1005:                        oldp = (char *)oldp + sizeof(struct in6_addr);
        !          1006:                        written += sizeof(struct in6_addr);
        !          1007:                        error = sysctl_copyout(l, &in6m->in6m_addr,
        !          1008:                            oldp, sizeof(struct in6_addr));
        !          1009:                        if (error)
        !          1010:                                goto done;
        !          1011:                        oldp = (char *)oldp + sizeof(struct in6_addr);
        !          1012:                        written += sizeof(struct in6_addr);
        !          1013:                        tmp = in6m->in6m_refcount;
        !          1014:                        error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
        !          1015:                        if (error)
        !          1016:                                goto done;
        !          1017:                        oldp = (char *)oldp + sizeof(tmp);
        !          1018:                        written += sizeof(tmp);
        !          1019:                }
        !          1020:        }
        !          1021: done:
        !          1022:        *oldlenp = written;
        !          1023:        return error;
        !          1024: }
        !          1025:
        !          1026: SYSCTL_SETUP(sysctl_in6_mklude_setup, "sysctl net.inet6.multicast_kludge subtree setup")
        !          1027: {
        !          1028:
        !          1029:        sysctl_createv(clog, 0, NULL, NULL,
        !          1030:                       CTLFLAG_PERMANENT,
        !          1031:                       CTLTYPE_NODE, "inet6", NULL,
        !          1032:                       NULL, 0, NULL, 0,
        !          1033:                       CTL_NET, PF_INET6, CTL_EOL);
        !          1034:
        !          1035:        sysctl_createv(clog, 0, NULL, NULL,
        !          1036:                       CTLFLAG_PERMANENT,
        !          1037:                       CTLTYPE_NODE, "multicast",
        !          1038:                       SYSCTL_DESCR("Multicast information"),
        !          1039:                       in6_multicast_sysctl, 0, NULL, 0,
        !          1040:                       CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL);
        !          1041:
        !          1042:        sysctl_createv(clog, 0, NULL, NULL,
        !          1043:                       CTLFLAG_PERMANENT,
        !          1044:                       CTLTYPE_NODE, "multicast_kludge",
        !          1045:                       SYSCTL_DESCR("multicast kludge information"),
        !          1046:                       in6_mkludge_sysctl, 0, NULL, 0,
        !          1047:                       CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL);
        !          1048: }

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