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Annotation of src/sys/netinet6/mld6.c, Revision 1.66

1.66    ! ozaki-r     1: /*     $NetBSD: mld6.c,v 1.65 2016/06/10 13:27:16 ozaki-r 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>
1.66    ! ozaki-r   105: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.65 2016/06/10 13:27:16 ozaki-r Exp $");
1.2       itojun    106:
1.63      pooka     107: #ifdef _KERNEL_OPT
1.2       itojun    108: #include "opt_inet.h"
1.63      pooka     109: #endif
1.2       itojun    110:
                    111: #include <sys/param.h>
                    112: #include <sys/systm.h>
                    113: #include <sys/mbuf.h>
                    114: #include <sys/socket.h>
1.45      ad        115: #include <sys/socketvar.h>
1.2       itojun    116: #include <sys/protosw.h>
                    117: #include <sys/syslog.h>
1.31      rpaulo    118: #include <sys/sysctl.h>
                    119: #include <sys/kernel.h>
                    120: #include <sys/callout.h>
1.55      tls       121: #include <sys/cprng.h>
1.2       itojun    122:
                    123: #include <net/if.h>
                    124:
                    125: #include <netinet/in.h>
                    126: #include <netinet/in_var.h>
1.31      rpaulo    127: #include <netinet6/in6_var.h>
1.10      itojun    128: #include <netinet/ip6.h>
1.2       itojun    129: #include <netinet6/ip6_var.h>
1.29      rpaulo    130: #include <netinet6/scope6_var.h>
1.10      itojun    131: #include <netinet/icmp6.h>
1.44      thorpej   132: #include <netinet6/icmp6_private.h>
1.2       itojun    133: #include <netinet6/mld6_var.h>
                    134:
1.7       itojun    135: #include <net/net_osdep.h>
                    136:
1.31      rpaulo    137:
                    138: /*
                    139:  * This structure is used to keep track of in6_multi chains which belong to
                    140:  * deleted interface addresses.
                    141:  */
1.56      joerg     142: static LIST_HEAD(, multi6_kludge) in6_mk = LIST_HEAD_INITIALIZER(in6_mk);
1.31      rpaulo    143:
                    144: struct multi6_kludge {
                    145:        LIST_ENTRY(multi6_kludge) mk_entry;
                    146:        struct ifnet *mk_ifp;
                    147:        struct in6_multihead mk_head;
                    148: };
                    149:
                    150:
1.2       itojun    151: /*
                    152:  * Protocol constants
                    153:  */
                    154:
                    155: /*
                    156:  * time between repetitions of a node's initial report of interest in a
                    157:  * multicast address(in seconds)
                    158:  */
1.22      itojun    159: #define MLD_UNSOLICITED_REPORT_INTERVAL        10
1.2       itojun    160:
                    161: static struct ip6_pktopts ip6_opts;
                    162:
1.31      rpaulo    163: static void mld_start_listening(struct in6_multi *);
                    164: static void mld_stop_listening(struct in6_multi *);
                    165:
                    166: static struct mld_hdr * mld_allocbuf(struct mbuf **, int, struct in6_multi *,
                    167:        int);
                    168: static void mld_sendpkt(struct in6_multi *, int, const struct in6_addr *);
                    169: static void mld_starttimer(struct in6_multi *);
                    170: static void mld_stoptimer(struct in6_multi *);
                    171: static u_long mld_timerresid(struct in6_multi *);
1.2       itojun    172:
                    173: void
1.42      matt      174: mld_init(void)
1.2       itojun    175: {
                    176:        static u_int8_t hbh_buf[8];
                    177:        struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
                    178:        u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
                    179:
                    180:        /* ip6h_nxt will be fill in later */
1.11      itojun    181:        hbh->ip6h_len = 0;      /* (8 >> 3) - 1 */
1.2       itojun    182:
                    183:        /* XXX: grotty hard coding... */
                    184:        hbh_buf[2] = IP6OPT_PADN;       /* 2 byte padding */
                    185:        hbh_buf[3] = 0;
                    186:        hbh_buf[4] = IP6OPT_RTALERT;
                    187:        hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
1.50      tsutsui   188:        memcpy(&hbh_buf[6], (void *)&rtalert_code, sizeof(u_int16_t));
1.2       itojun    189:
                    190:        ip6_opts.ip6po_hbh = hbh;
                    191:        /* We will specify the hoplimit by a multicast option. */
                    192:        ip6_opts.ip6po_hlim = -1;
1.62      roy       193:        ip6_opts.ip6po_prefer_tempaddr = IP6PO_TEMPADDR_NOTPREFER;
1.2       itojun    194: }
                    195:
1.31      rpaulo    196: static void
1.38      christos  197: mld_starttimer(struct in6_multi *in6m)
1.31      rpaulo    198: {
                    199:        struct timeval now;
                    200:
1.61      ozaki-r   201:        KASSERT(in6m->in6m_timer != IN6M_TIMER_UNDEF);
                    202:
1.31      rpaulo    203:        microtime(&now);
                    204:        in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz;
                    205:        in6m->in6m_timer_expire.tv_usec = now.tv_usec +
                    206:            (in6m->in6m_timer % hz) * (1000000 / hz);
                    207:        if (in6m->in6m_timer_expire.tv_usec > 1000000) {
                    208:                in6m->in6m_timer_expire.tv_sec++;
                    209:                in6m->in6m_timer_expire.tv_usec -= 1000000;
                    210:        }
                    211:
                    212:        /* start or restart the timer */
1.41      joerg     213:        callout_schedule(&in6m->in6m_timer_ch, in6m->in6m_timer);
1.31      rpaulo    214: }
                    215:
                    216: static void
1.38      christos  217: mld_stoptimer(struct in6_multi *in6m)
1.31      rpaulo    218: {
                    219:        if (in6m->in6m_timer == IN6M_TIMER_UNDEF)
                    220:                return;
                    221:
1.41      joerg     222:        callout_stop(&in6m->in6m_timer_ch);
1.31      rpaulo    223:
                    224:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    225: }
                    226:
                    227: static void
1.41      joerg     228: mld_timeo(void *arg)
1.31      rpaulo    229: {
1.41      joerg     230:        struct in6_multi *in6m = arg;
1.45      ad        231:
                    232:        mutex_enter(softnet_lock);
                    233:        KERNEL_LOCK(1, NULL);
1.31      rpaulo    234:
1.61      ozaki-r   235:        if (in6m->in6m_timer == IN6M_TIMER_UNDEF)
                    236:                goto out;
                    237:
1.31      rpaulo    238:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    239:
                    240:        switch (in6m->in6m_state) {
                    241:        case MLD_REPORTPENDING:
                    242:                mld_start_listening(in6m);
                    243:                break;
                    244:        default:
                    245:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    246:                break;
                    247:        }
                    248:
1.61      ozaki-r   249: out:
1.45      ad        250:        KERNEL_UNLOCK_ONE(NULL);
                    251:        mutex_exit(softnet_lock);
1.31      rpaulo    252: }
                    253:
                    254: static u_long
1.38      christos  255: mld_timerresid(struct in6_multi *in6m)
1.31      rpaulo    256: {
                    257:        struct timeval now, diff;
                    258:
                    259:        microtime(&now);
                    260:
                    261:        if (now.tv_sec > in6m->in6m_timer_expire.tv_sec ||
                    262:            (now.tv_sec == in6m->in6m_timer_expire.tv_sec &&
                    263:            now.tv_usec > in6m->in6m_timer_expire.tv_usec)) {
                    264:                return (0);
                    265:        }
                    266:        diff = in6m->in6m_timer_expire;
                    267:        diff.tv_sec -= now.tv_sec;
                    268:        diff.tv_usec -= now.tv_usec;
                    269:        if (diff.tv_usec < 0) {
                    270:                diff.tv_sec--;
                    271:                diff.tv_usec += 1000000;
                    272:        }
                    273:
                    274:        /* return the remaining time in milliseconds */
1.47      adrianp   275:        return diff.tv_sec * 1000 + diff.tv_usec / 1000;
1.31      rpaulo    276: }
                    277:
                    278: static void
1.38      christos  279: mld_start_listening(struct in6_multi *in6m)
1.2       itojun    280: {
1.29      rpaulo    281:        struct in6_addr all_in6;
                    282:
1.2       itojun    283:        /*
1.11      itojun    284:         * RFC2710 page 10:
1.2       itojun    285:         * The node never sends a Report or Done for the link-scope all-nodes
                    286:         * address.
                    287:         * MLD messages are never sent for multicast addresses whose scope is 0
                    288:         * (reserved) or 1 (node-local).
                    289:         */
1.29      rpaulo    290:        all_in6 = in6addr_linklocal_allnodes;
                    291:        if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) {
                    292:                /* XXX: this should not happen! */
                    293:                in6m->in6m_timer = 0;
                    294:                in6m->in6m_state = MLD_OTHERLISTENER;
                    295:        }
                    296:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.2       itojun    297:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
1.31      rpaulo    298:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.22      itojun    299:                in6m->in6m_state = MLD_OTHERLISTENER;
1.2       itojun    300:        } else {
1.31      rpaulo    301:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
1.55      tls       302:                in6m->in6m_timer = cprng_fast32() %
1.31      rpaulo    303:                    (MLD_UNSOLICITED_REPORT_INTERVAL * hz);
1.22      itojun    304:                in6m->in6m_state = MLD_IREPORTEDLAST;
1.31      rpaulo    305:
                    306:                mld_starttimer(in6m);
1.2       itojun    307:        }
                    308: }
                    309:
1.31      rpaulo    310: static void
1.38      christos  311: mld_stop_listening(struct in6_multi *in6m)
1.2       itojun    312: {
1.29      rpaulo    313:        struct in6_addr allnode, allrouter;
                    314:
                    315:        allnode = in6addr_linklocal_allnodes;
                    316:        if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) {
                    317:                /* XXX: this should not happen! */
                    318:                return;
                    319:        }
                    320:        allrouter = in6addr_linklocal_allrouters;
                    321:        if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) {
                    322:                /* XXX impossible */
                    323:                return;
                    324:        }
1.2       itojun    325:
1.22      itojun    326:        if (in6m->in6m_state == MLD_IREPORTEDLAST &&
1.29      rpaulo    327:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode)) &&
                    328:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) >
                    329:            IPV6_ADDR_SCOPE_INTFACELOCAL) {
1.31      rpaulo    330:                mld_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter);
1.29      rpaulo    331:        }
1.2       itojun    332: }
                    333:
                    334: void
1.38      christos  335: mld_input(struct mbuf *m, int off)
1.2       itojun    336: {
1.52      dholland  337:        struct ip6_hdr *ip6;
1.22      itojun    338:        struct mld_hdr *mldh;
1.66    ! ozaki-r   339:        struct ifnet *ifp;
1.31      rpaulo    340:        struct in6_multi *in6m = NULL;
1.29      rpaulo    341:        struct in6_addr mld_addr, all_in6;
1.2       itojun    342:        struct in6_ifaddr *ia;
1.47      adrianp   343:        u_long timer = 0;       /* timer value in the MLD query header */
1.66    ! ozaki-r   344:        int s;
1.2       itojun    345:
1.66    ! ozaki-r   346:        ifp = m_get_rcvif(m, &s);
1.22      itojun    347:        IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
1.13      itojun    348:        if (mldh == NULL) {
1.44      thorpej   349:                ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1.66    ! ozaki-r   350:                goto out_nodrop;
1.13      itojun    351:        }
                    352:
1.2       itojun    353:        /* source address validation */
1.13      itojun    354:        ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2       itojun    355:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.31      rpaulo    356:                /*
                    357:                 * RFC3590 allows the IPv6 unspecified address as the source
                    358:                 * address of MLD report and done messages.  However, as this
                    359:                 * same document says, this special rule is for snooping
                    360:                 * switches and the RFC requires routers to discard MLD packets
                    361:                 * with the unspecified source address.  The RFC only talks
                    362:                 * about hosts receiving an MLD query or report in Security
                    363:                 * Considerations, but this is probably the correct intention.
                    364:                 * RFC3590 does not talk about other cases than link-local and
                    365:                 * the unspecified source addresses, but we believe the same
                    366:                 * rule should be applied.
                    367:                 * As a result, we only allow link-local addresses as the
                    368:                 * source address; otherwise, simply discard the packet.
                    369:                 */
1.18      itojun    370: #if 0
1.31      rpaulo    371:                /*
                    372:                 * XXX: do not log in an input path to avoid log flooding,
                    373:                 * though RFC3590 says "SHOULD log" if the source of a query
                    374:                 * is the unspecified address.
                    375:                 */
                    376:                log(LOG_INFO,
1.22      itojun    377:                    "mld_input: src %s is not link-local (grp=%s)\n",
1.31      rpaulo    378:                    ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&mldh->mld_addr));
1.18      itojun    379: #endif
1.66    ! ozaki-r   380:                goto out;
1.2       itojun    381:        }
                    382:
                    383:        /*
1.29      rpaulo    384:         * make a copy for local work (in6_setscope() may modify the 1st arg)
                    385:         */
                    386:        mld_addr = mldh->mld_addr;
                    387:        if (in6_setscope(&mld_addr, ifp, NULL)) {
                    388:                /* XXX: this should not happen! */
1.66    ! ozaki-r   389:                goto out;
1.29      rpaulo    390:        }
                    391:
                    392:        /*
1.31      rpaulo    393:         * In the MLD specification, there are 3 states and a flag.
1.2       itojun    394:         *
                    395:         * In Non-Listener state, we simply don't have a membership record.
                    396:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
1.31      rpaulo    397:         * In Idle Listener state, our timer is not running
                    398:         * (in6m->in6m_timer==IN6M_TIMER_UNDEF)
1.2       itojun    399:         *
1.22      itojun    400:         * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
                    401:         * we have heard a report from another member, or MLD_IREPORTEDLAST
1.2       itojun    402:         * if we sent the last report.
                    403:         */
1.22      itojun    404:        switch (mldh->mld_type) {
                    405:        case MLD_LISTENER_QUERY:
1.7       itojun    406:                if (ifp->if_flags & IFF_LOOPBACK)
                    407:                        break;
                    408:
1.29      rpaulo    409:                if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    410:                    !IN6_IS_ADDR_MULTICAST(&mld_addr))
1.7       itojun    411:                        break;  /* print error or log stat? */
1.29      rpaulo    412:
                    413:                all_in6 = in6addr_linklocal_allnodes;
                    414:                if (in6_setscope(&all_in6, ifp, NULL)) {
                    415:                        /* XXX: this should not happen! */
                    416:                        break;
                    417:                }
1.2       itojun    418:
1.7       itojun    419:                /*
1.11      itojun    420:                 * - Start the timers in all of our membership records
                    421:                 *   that the query applies to for the interface on
                    422:                 *   which the query arrived excl. those that belong
                    423:                 *   to the "all-nodes" group (ff02::1).
                    424:                 * - Restart any timer that is already running but has
1.30      rpaulo    425:                 *   a value longer than the requested timeout.
1.11      itojun    426:                 * - Use the value specified in the query message as
                    427:                 *   the maximum timeout.
                    428:                 */
1.31      rpaulo    429:                timer = ntohs(mldh->mld_maxdelay);
                    430:
1.7       itojun    431:                IFP_TO_IA6(ifp, ia);
                    432:                if (ia == NULL)
                    433:                        break;
1.2       itojun    434:
1.35      dyoung    435:                LIST_FOREACH(in6m, &ia->ia6_multiaddrs, in6m_entry) {
1.29      rpaulo    436:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.7       itojun    437:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
                    438:                            IPV6_ADDR_SCOPE_LINKLOCAL)
                    439:                                continue;
1.2       itojun    440:
1.31      rpaulo    441:                        if (in6m->in6m_state == MLD_REPORTPENDING)
                    442:                                continue; /* we are not yet ready */
                    443:
                    444:                        if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    445:                            !IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr))
                    446:                                continue;
                    447:
                    448:                        if (timer == 0) {
                    449:                                /* send a report immediately */
                    450:                                mld_stoptimer(in6m);
                    451:                                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    452:                                in6m->in6m_state = MLD_IREPORTEDLAST;
                    453:                        } else if (in6m->in6m_timer == IN6M_TIMER_UNDEF ||
1.47      adrianp   454:                            mld_timerresid(in6m) > timer) {
                    455:                                in6m->in6m_timer =
1.55      tls       456:                                   1 + (cprng_fast32() % timer) * hz / 1000;
1.31      rpaulo    457:                                mld_starttimer(in6m);
1.7       itojun    458:                        }
                    459:                }
1.29      rpaulo    460:                break;
1.2       itojun    461:
1.22      itojun    462:        case MLD_LISTENER_REPORT:
1.2       itojun    463:                /*
1.11      itojun    464:                 * For fast leave to work, we have to know that we are the
                    465:                 * last person to send a report for this group.  Reports
                    466:                 * can potentially get looped back if we are a multicast
                    467:                 * router, so discard reports sourced by me.
                    468:                 * Note that it is impossible to check IFF_LOOPBACK flag of
                    469:                 * ifp for this purpose, since ip6_mloopback pass the physical
                    470:                 * interface to looutput.
                    471:                 */
1.7       itojun    472:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
                    473:                        break;
                    474:
1.22      itojun    475:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7       itojun    476:                        break;
                    477:
                    478:                /*
1.11      itojun    479:                 * If we belong to the group being reported, stop
                    480:                 * our timer for that group.
                    481:                 */
1.29      rpaulo    482:                IN6_LOOKUP_MULTI(mld_addr, ifp, in6m);
1.7       itojun    483:                if (in6m) {
1.31      rpaulo    484:                        mld_stoptimer(in6m); /* transit to idle state */
1.22      itojun    485:                        in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7       itojun    486:                }
                    487:                break;
                    488:        default:                /* this is impossible */
1.18      itojun    489: #if 0
1.19      itojun    490:                /*
                    491:                 * this case should be impossible because of filtering in
                    492:                 * icmp6_input().  But we explicitly disabled this part
                    493:                 * just in case.
                    494:                 */
1.31      rpaulo    495:                log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld_type);
1.18      itojun    496: #endif
1.7       itojun    497:                break;
1.2       itojun    498:        }
1.11      itojun    499:
1.66    ! ozaki-r   500: out:
1.11      itojun    501:        m_freem(m);
1.66    ! ozaki-r   502: out_nodrop:
        !           503:        m_put_rcvif(ifp, &s);
1.2       itojun    504: }
                    505:
                    506: static void
1.38      christos  507: mld_sendpkt(struct in6_multi *in6m, int type,
                    508:        const struct in6_addr *dst)
1.2       itojun    509: {
1.31      rpaulo    510:        struct mbuf *mh;
1.22      itojun    511:        struct mld_hdr *mldh;
1.31      rpaulo    512:        struct ip6_hdr *ip6 = NULL;
1.2       itojun    513:        struct ip6_moptions im6o;
1.31      rpaulo    514:        struct in6_ifaddr *ia = NULL;
1.2       itojun    515:        struct ifnet *ifp = in6m->in6m_ifp;
1.19      itojun    516:        int ignflags;
1.2       itojun    517:
                    518:        /*
                    519:         * At first, find a link local address on the outgoing interface
                    520:         * to use as the source address of the MLD packet.
1.19      itojun    521:         * We do not reject tentative addresses for MLD report to deal with
                    522:         * the case where we first join a link-local address.
1.2       itojun    523:         */
1.19      itojun    524:        ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
                    525:        if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL)
1.2       itojun    526:                return;
1.19      itojun    527:        if ((ia->ia6_flags & IN6_IFF_TENTATIVE))
                    528:                ia = NULL;
1.2       itojun    529:
1.31      rpaulo    530:        /* Allocate two mbufs to store IPv6 header and MLD header */
                    531:        mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type);
                    532:        if (mldh == NULL)
1.2       itojun    533:                return;
                    534:
1.31      rpaulo    535:        /* fill src/dst here */
                    536:        ip6 = mtod(mh, struct ip6_hdr *);
                    537:        ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
                    538:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
1.2       itojun    539:
1.22      itojun    540:        mldh->mld_addr = in6m->in6m_addr;
1.29      rpaulo    541:        in6_clearscope(&mldh->mld_addr); /* XXX */
1.22      itojun    542:        mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
                    543:            sizeof(struct mld_hdr));
1.2       itojun    544:
                    545:        /* construct multicast option */
1.31      rpaulo    546:        memset(&im6o, 0, sizeof(im6o));
1.2       itojun    547:        im6o.im6o_multicast_ifp = ifp;
                    548:        im6o.im6o_multicast_hlim = 1;
                    549:
                    550:        /*
                    551:         * Request loopback of the report if we are acting as a multicast
                    552:         * router, so that the process-level routing daemon can hear it.
                    553:         */
                    554:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    555:
                    556:        /* increment output statictics */
1.44      thorpej   557:        ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
1.15      itojun    558:        icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17      itojun    559:        switch (type) {
1.22      itojun    560:        case MLD_LISTENER_QUERY:
1.15      itojun    561:                icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
                    562:                break;
1.22      itojun    563:        case MLD_LISTENER_REPORT:
1.15      itojun    564:                icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
                    565:                break;
1.22      itojun    566:        case MLD_LISTENER_DONE:
1.15      itojun    567:                icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
                    568:                break;
1.7       itojun    569:        }
1.19      itojun    570:
1.27      perry     571:        ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC,
1.53      plunky    572:            &im6o, NULL, NULL);
1.2       itojun    573: }
1.31      rpaulo    574:
                    575: static struct mld_hdr *
1.34      christos  576: mld_allocbuf(struct mbuf **mh, int len, struct in6_multi *in6m,
1.33      christos  577:     int type)
1.31      rpaulo    578: {
                    579:        struct mbuf *md;
                    580:        struct mld_hdr *mldh;
                    581:        struct ip6_hdr *ip6;
                    582:
                    583:        /*
                    584:         * Allocate mbufs to store ip6 header and MLD header.
                    585:         * We allocate 2 mbufs and make chain in advance because
                    586:         * it is more convenient when inserting the hop-by-hop option later.
                    587:         */
                    588:        MGETHDR(*mh, M_DONTWAIT, MT_HEADER);
                    589:        if (*mh == NULL)
                    590:                return NULL;
                    591:        MGET(md, M_DONTWAIT, MT_DATA);
                    592:        if (md == NULL) {
                    593:                m_free(*mh);
                    594:                *mh = NULL;
                    595:                return NULL;
                    596:        }
                    597:        (*mh)->m_next = md;
                    598:        md->m_next = NULL;
                    599:
1.65      ozaki-r   600:        m_reset_rcvif((*mh));
1.31      rpaulo    601:        (*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len;
                    602:        (*mh)->m_len = sizeof(struct ip6_hdr);
                    603:        MH_ALIGN(*mh, sizeof(struct ip6_hdr));
                    604:
                    605:        /* fill in the ip6 header */
                    606:        ip6 = mtod(*mh, struct ip6_hdr *);
                    607:        memset(ip6, 0, sizeof(*ip6));
                    608:        ip6->ip6_flow = 0;
                    609:        ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
                    610:        ip6->ip6_vfc |= IPV6_VERSION;
                    611:        /* ip6_plen will be set later */
                    612:        ip6->ip6_nxt = IPPROTO_ICMPV6;
                    613:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
                    614:        /* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */
                    615:
                    616:        /* fill in the MLD header as much as possible */
                    617:        md->m_len = len;
                    618:        mldh = mtod(md, struct mld_hdr *);
                    619:        memset(mldh, 0, len);
                    620:        mldh->mld_type = type;
                    621:        return mldh;
                    622: }
                    623:
                    624: /*
                    625:  * Add an address to the list of IP6 multicast addresses for a given interface.
                    626:  */
                    627: struct in6_multi *
1.38      christos  628: in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp,
                    629:        int *errorp, int timer)
1.31      rpaulo    630: {
                    631:        struct  in6_ifaddr *ia;
1.54      dyoung    632:        struct  sockaddr_in6 sin6;
1.31      rpaulo    633:        struct  in6_multi *in6m;
                    634:        int     s = splsoftnet();
                    635:
                    636:        *errorp = 0;
                    637:
                    638:        /*
                    639:         * See if address already in list.
                    640:         */
                    641:        IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
                    642:        if (in6m != NULL) {
                    643:                /*
                    644:                 * Found it; just increment the refrence count.
                    645:                 */
                    646:                in6m->in6m_refcount++;
                    647:        } else {
                    648:                /*
                    649:                 * New address; allocate a new multicast record
                    650:                 * and link it into the interface's multicast list.
                    651:                 */
                    652:                in6m = (struct in6_multi *)
1.51      dyoung    653:                        malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT|M_ZERO);
1.31      rpaulo    654:                if (in6m == NULL) {
                    655:                        splx(s);
                    656:                        *errorp = ENOBUFS;
                    657:                        return (NULL);
                    658:                }
                    659:
                    660:                in6m->in6m_addr = *maddr6;
                    661:                in6m->in6m_ifp = ifp;
                    662:                in6m->in6m_refcount = 1;
                    663:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.64      joerg     664:                callout_init(&in6m->in6m_timer_ch, CALLOUT_MPSAFE);
                    665:                callout_setfunc(&in6m->in6m_timer_ch, mld_timeo, in6m);
                    666:
1.31      rpaulo    667:                IFP_TO_IA6(ifp, ia);
                    668:                if (ia == NULL) {
1.64      joerg     669:                        callout_destroy(&in6m->in6m_timer_ch);
1.31      rpaulo    670:                        free(in6m, M_IPMADDR);
                    671:                        splx(s);
                    672:                        *errorp = EADDRNOTAVAIL; /* appropriate? */
                    673:                        return (NULL);
                    674:                }
                    675:                in6m->in6m_ia = ia;
1.60      rmind     676:                ifaref(&ia->ia_ifa); /* gain a reference */
1.31      rpaulo    677:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    678:
                    679:                /*
                    680:                 * Ask the network driver to update its multicast reception
                    681:                 * filter appropriately for the new address.
                    682:                 */
1.54      dyoung    683:                sockaddr_in6_init(&sin6, maddr6, 0, 0, 0);
                    684:                *errorp = if_mcast_op(ifp, SIOCADDMULTI, sin6tosa(&sin6));
1.31      rpaulo    685:                if (*errorp) {
1.64      joerg     686:                        callout_destroy(&in6m->in6m_timer_ch);
1.31      rpaulo    687:                        LIST_REMOVE(in6m, in6m_entry);
                    688:                        free(in6m, M_IPMADDR);
1.60      rmind     689:                        ifafree(&ia->ia_ifa);
1.31      rpaulo    690:                        splx(s);
                    691:                        return (NULL);
                    692:                }
                    693:
1.32      rpaulo    694:                in6m->in6m_timer = timer;
1.31      rpaulo    695:                if (in6m->in6m_timer > 0) {
                    696:                        in6m->in6m_state = MLD_REPORTPENDING;
                    697:                        mld_starttimer(in6m);
                    698:
                    699:                        splx(s);
                    700:                        return (in6m);
                    701:                }
                    702:
                    703:                /*
                    704:                 * Let MLD6 know that we have joined a new IP6 multicast
                    705:                 * group.
                    706:                 */
                    707:                mld_start_listening(in6m);
                    708:        }
                    709:        splx(s);
                    710:        return (in6m);
                    711: }
                    712:
                    713: /*
                    714:  * Delete a multicast address record.
                    715:  */
                    716: void
1.38      christos  717: in6_delmulti(struct in6_multi *in6m)
1.31      rpaulo    718: {
1.54      dyoung    719:        struct  sockaddr_in6 sin6;
1.31      rpaulo    720:        struct  in6_ifaddr *ia;
                    721:        int     s = splsoftnet();
                    722:
                    723:        mld_stoptimer(in6m);
                    724:
                    725:        if (--in6m->in6m_refcount == 0) {
                    726:                /*
                    727:                 * No remaining claims to this record; let MLD6 know
                    728:                 * that we are leaving the multicast group.
                    729:                 */
                    730:                mld_stop_listening(in6m);
                    731:
                    732:                /*
                    733:                 * Unlink from list.
                    734:                 */
                    735:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    736:                if (in6m->in6m_ia != NULL) {
1.60      rmind     737:                        ifafree(&in6m->in6m_ia->ia_ifa); /* release reference */
1.35      dyoung    738:                        in6m->in6m_ia = NULL;
1.31      rpaulo    739:                }
                    740:
                    741:                /*
                    742:                 * Delete all references of this multicasting group from
                    743:                 * the membership arrays
                    744:                 */
                    745:                for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
                    746:                        struct in6_multi_mship *imm;
1.35      dyoung    747:                        LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) {
1.31      rpaulo    748:                                if (imm->i6mm_maddr == in6m)
                    749:                                        imm->i6mm_maddr = NULL;
                    750:                        }
                    751:                }
                    752:
                    753:                /*
                    754:                 * Notify the network driver to update its multicast
                    755:                 * reception filter.
                    756:                 */
1.54      dyoung    757:                sockaddr_in6_init(&sin6, &in6m->in6m_addr, 0, 0, 0);
                    758:                if_mcast_op(in6m->in6m_ifp, SIOCDELMULTI, sin6tosa(&sin6));
1.61      ozaki-r   759:
                    760:                /* Tell mld_timeo we're halting the timer */
                    761:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    762:                callout_halt(&in6m->in6m_timer_ch, softnet_lock);
1.41      joerg     763:                callout_destroy(&in6m->in6m_timer_ch);
1.61      ozaki-r   764:
1.31      rpaulo    765:                free(in6m, M_IPMADDR);
                    766:        }
                    767:        splx(s);
                    768: }
                    769:
                    770:
                    771: struct in6_multi_mship *
1.38      christos  772: in6_joingroup(struct ifnet *ifp, struct in6_addr *addr,
                    773:        int *errorp, int timer)
1.31      rpaulo    774: {
                    775:        struct in6_multi_mship *imm;
                    776:
1.51      dyoung    777:        imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT|M_ZERO);
                    778:        if (imm == NULL) {
1.31      rpaulo    779:                *errorp = ENOBUFS;
                    780:                return NULL;
                    781:        }
                    782:
1.32      rpaulo    783:        imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, timer);
1.31      rpaulo    784:        if (!imm->i6mm_maddr) {
1.36      dyoung    785:                /* *errorp is already set */
1.31      rpaulo    786:                free(imm, M_IPMADDR);
                    787:                return NULL;
                    788:        }
                    789:        return imm;
                    790: }
                    791:
                    792: int
1.38      christos  793: in6_leavegroup(struct in6_multi_mship *imm)
1.31      rpaulo    794: {
                    795:
                    796:        if (imm->i6mm_maddr) {
                    797:                in6_delmulti(imm->i6mm_maddr);
                    798:        }
                    799:        free(imm, M_IPMADDR);
                    800:        return 0;
                    801: }
                    802:
                    803:
                    804: /*
                    805:  * Multicast address kludge:
                    806:  * If there were any multicast addresses attached to this interface address,
                    807:  * either move them to another address on this interface, or save them until
                    808:  * such time as this interface is reconfigured for IPv6.
                    809:  */
                    810: void
1.38      christos  811: in6_savemkludge(struct in6_ifaddr *oia)
1.31      rpaulo    812: {
                    813:        struct in6_ifaddr *ia;
1.36      dyoung    814:        struct in6_multi *in6m;
1.31      rpaulo    815:
                    816:        IFP_TO_IA6(oia->ia_ifp, ia);
                    817:        if (ia) {       /* there is another address */
1.36      dyoung    818:                KASSERT(ia != oia);
                    819:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    820:                        LIST_REMOVE(in6m, in6m_entry);
1.60      rmind     821:                        ifaref(&ia->ia_ifa);
                    822:                        ifafree(&in6m->in6m_ia->ia_ifa);
1.31      rpaulo    823:                        in6m->in6m_ia = ia;
                    824:                        LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    825:                }
                    826:        } else {        /* last address on this if deleted, save */
                    827:                struct multi6_kludge *mk;
                    828:
1.35      dyoung    829:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    830:                        if (mk->mk_ifp == oia->ia_ifp)
                    831:                                break;
                    832:                }
                    833:                if (mk == NULL) /* this should not happen! */
                    834:                        panic("in6_savemkludge: no kludge space");
                    835:
1.36      dyoung    836:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    837:                        LIST_REMOVE(in6m, in6m_entry);
1.60      rmind     838:                        ifafree(&in6m->in6m_ia->ia_ifa); /* release reference */
1.31      rpaulo    839:                        in6m->in6m_ia = NULL;
                    840:                        LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
                    841:                }
                    842:        }
                    843: }
                    844:
                    845: /*
                    846:  * Continuation of multicast address hack:
                    847:  * If there was a multicast group list previously saved for this interface,
                    848:  * then we re-attach it to the first address configured on the i/f.
                    849:  */
                    850: void
1.38      christos  851: in6_restoremkludge(struct in6_ifaddr *ia, struct ifnet *ifp)
1.31      rpaulo    852: {
                    853:        struct multi6_kludge *mk;
1.36      dyoung    854:        struct in6_multi *in6m;
1.31      rpaulo    855:
1.35      dyoung    856:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    857:                if (mk->mk_ifp == ifp)
1.31      rpaulo    858:                        break;
                    859:        }
1.35      dyoung    860:        if (mk == NULL)
                    861:                return;
1.36      dyoung    862:        while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) {
                    863:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    864:                in6m->in6m_ia = ia;
1.60      rmind     865:                ifaref(&ia->ia_ifa);
1.35      dyoung    866:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    867:        }
1.31      rpaulo    868: }
                    869:
                    870: /*
                    871:  * Allocate space for the kludge at interface initialization time.
                    872:  * Formerly, we dynamically allocated the space in in6_savemkludge() with
                    873:  * malloc(M_WAITOK).  However, it was wrong since the function could be called
                    874:  * under an interrupt context (software timer on address lifetime expiration).
                    875:  * Also, we cannot just give up allocating the strucutre, since the group
                    876:  * membership structure is very complex and we need to keep it anyway.
                    877:  * Of course, this function MUST NOT be called under an interrupt context.
                    878:  * Specifically, it is expected to be called only from in6_ifattach(), though
                    879:  * it is a global function.
                    880:  */
                    881: void
1.38      christos  882: in6_createmkludge(struct ifnet *ifp)
1.31      rpaulo    883: {
                    884:        struct multi6_kludge *mk;
                    885:
1.35      dyoung    886:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    887:                /* If we've already had one, do not allocate. */
                    888:                if (mk->mk_ifp == ifp)
                    889:                        return;
                    890:        }
                    891:
1.51      dyoung    892:        mk = malloc(sizeof(*mk), M_IPMADDR, M_ZERO|M_WAITOK);
1.31      rpaulo    893:
                    894:        LIST_INIT(&mk->mk_head);
                    895:        mk->mk_ifp = ifp;
                    896:        LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
                    897: }
                    898:
                    899: void
1.38      christos  900: in6_purgemkludge(struct ifnet *ifp)
1.31      rpaulo    901: {
                    902:        struct multi6_kludge *mk;
1.36      dyoung    903:        struct in6_multi *in6m, *next;
1.31      rpaulo    904:
1.35      dyoung    905:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    906:                if (mk->mk_ifp == ifp)
                    907:                        break;
                    908:        }
                    909:        if (mk == NULL)
                    910:                return;
                    911:
                    912:        /* leave from all multicast groups joined */
1.36      dyoung    913:        for (in6m = LIST_FIRST(&mk->mk_head); in6m != NULL; in6m = next) {
                    914:                next = LIST_NEXT(in6m, in6m_entry);
1.35      dyoung    915:                in6_delmulti(in6m);
1.31      rpaulo    916:        }
1.35      dyoung    917:        LIST_REMOVE(mk, mk_entry);
                    918:        free(mk, M_IPMADDR);
1.31      rpaulo    919: }
1.57      joerg     920:
                    921: static int
                    922: in6_mkludge_sysctl(SYSCTLFN_ARGS)
                    923: {
                    924:        struct multi6_kludge *mk;
                    925:        struct in6_multi *in6m;
                    926:        int error;
                    927:        uint32_t tmp;
                    928:        size_t written;
                    929:
                    930:        if (namelen != 1)
                    931:                return EINVAL;
                    932:
                    933:        if (oldp == NULL) {
                    934:                *oldlenp = 0;
                    935:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    936:                        if (mk->mk_ifp->if_index == name[0])
                    937:                                continue;
                    938:                        LIST_FOREACH(in6m, &mk->mk_head, in6m_entry) {
                    939:                                *oldlenp += sizeof(struct in6_addr) +
                    940:                                    sizeof(uint32_t);
                    941:                        }
                    942:                }
                    943:                return 0;
                    944:        }
                    945:
                    946:        error = 0;
                    947:        written = 0;
                    948:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    949:                if (mk->mk_ifp->if_index == name[0])
                    950:                        continue;
                    951:                LIST_FOREACH(in6m, &mk->mk_head, in6m_entry) {
                    952:                        if (written + sizeof(struct in6_addr) +
                    953:                            sizeof(uint32_t) > *oldlenp)
                    954:                                goto done;
                    955:                        error = sysctl_copyout(l, &in6m->in6m_addr,
                    956:                            oldp, sizeof(struct in6_addr));
                    957:                        if (error)
                    958:                                goto done;
                    959:                        oldp = (char *)oldp + sizeof(struct in6_addr);
                    960:                        written += sizeof(struct in6_addr);
                    961:                        tmp = in6m->in6m_refcount;
                    962:                        error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
                    963:                        if (error)
                    964:                                goto done;
                    965:                        oldp = (char *)oldp + sizeof(tmp);
                    966:                        written += sizeof(tmp);
                    967:                }
                    968:        }
                    969:
                    970: done:
                    971:        *oldlenp = written;
                    972:        return error;
                    973: }
                    974:
                    975: static int
                    976: in6_multicast_sysctl(SYSCTLFN_ARGS)
                    977: {
                    978:        struct ifnet *ifp;
                    979:        struct ifaddr *ifa;
                    980:        struct in6_ifaddr *ifa6;
                    981:        struct in6_multi *in6m;
                    982:        uint32_t tmp;
                    983:        int error;
                    984:        size_t written;
                    985:
                    986:        if (namelen != 1)
                    987:                return EINVAL;
                    988:
                    989:        ifp = if_byindex(name[0]);
                    990:        if (ifp == NULL)
                    991:                return ENODEV;
                    992:
                    993:        if (oldp == NULL) {
                    994:                *oldlenp = 0;
1.58      ozaki-r   995:                IFADDR_FOREACH(ifa, ifp) {
1.57      joerg     996:                        if (ifa->ifa_addr == NULL)
                    997:                                continue;
                    998:                        if (ifa->ifa_addr->sa_family != AF_INET6)
                    999:                                continue;
                   1000:                        ifa6 = (struct in6_ifaddr *)ifa;
                   1001:                        LIST_FOREACH(in6m, &ifa6->ia6_multiaddrs, in6m_entry) {
                   1002:                                *oldlenp += 2 * sizeof(struct in6_addr) +
                   1003:                                    sizeof(uint32_t);
                   1004:                        }
                   1005:                }
                   1006:                return 0;
                   1007:        }
                   1008:
                   1009:        error = 0;
                   1010:        written = 0;
1.58      ozaki-r  1011:        IFADDR_FOREACH(ifa, ifp) {
1.57      joerg    1012:                if (ifa->ifa_addr == NULL)
                   1013:                        continue;
                   1014:                if (ifa->ifa_addr->sa_family != AF_INET6)
                   1015:                        continue;
                   1016:                ifa6 = (struct in6_ifaddr *)ifa;
                   1017:                LIST_FOREACH(in6m, &ifa6->ia6_multiaddrs, in6m_entry) {
                   1018:                        if (written + 2 * sizeof(struct in6_addr) +
                   1019:                            sizeof(uint32_t) > *oldlenp)
                   1020:                                goto done;
                   1021:                        error = sysctl_copyout(l, &ifa6->ia_addr.sin6_addr,
                   1022:                            oldp, sizeof(struct in6_addr));
                   1023:                        if (error)
                   1024:                                goto done;
                   1025:                        oldp = (char *)oldp + sizeof(struct in6_addr);
                   1026:                        written += sizeof(struct in6_addr);
                   1027:                        error = sysctl_copyout(l, &in6m->in6m_addr,
                   1028:                            oldp, sizeof(struct in6_addr));
                   1029:                        if (error)
                   1030:                                goto done;
                   1031:                        oldp = (char *)oldp + sizeof(struct in6_addr);
                   1032:                        written += sizeof(struct in6_addr);
                   1033:                        tmp = in6m->in6m_refcount;
                   1034:                        error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
                   1035:                        if (error)
                   1036:                                goto done;
                   1037:                        oldp = (char *)oldp + sizeof(tmp);
                   1038:                        written += sizeof(tmp);
                   1039:                }
                   1040:        }
                   1041: done:
                   1042:        *oldlenp = written;
                   1043:        return error;
                   1044: }
                   1045:
                   1046: SYSCTL_SETUP(sysctl_in6_mklude_setup, "sysctl net.inet6.multicast_kludge subtree setup")
                   1047: {
                   1048:
                   1049:        sysctl_createv(clog, 0, NULL, NULL,
                   1050:                       CTLFLAG_PERMANENT,
1.59      joerg    1051:                       CTLTYPE_NODE, "inet6", NULL,
                   1052:                       NULL, 0, NULL, 0,
                   1053:                       CTL_NET, PF_INET6, CTL_EOL);
                   1054:
                   1055:        sysctl_createv(clog, 0, NULL, NULL,
                   1056:                       CTLFLAG_PERMANENT,
1.57      joerg    1057:                       CTLTYPE_NODE, "multicast",
                   1058:                       SYSCTL_DESCR("Multicast information"),
                   1059:                       in6_multicast_sysctl, 0, NULL, 0,
                   1060:                       CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL);
                   1061:
                   1062:        sysctl_createv(clog, 0, NULL, NULL,
                   1063:                       CTLFLAG_PERMANENT,
                   1064:                       CTLTYPE_NODE, "multicast_kludge",
                   1065:                       SYSCTL_DESCR("multicast kludge information"),
                   1066:                       in6_mkludge_sysctl, 0, NULL, 0,
                   1067:                       CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL);
                   1068: }

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