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Annotation of src/sys/netinet6/mld6.c, Revision 1.72.2.2

1.72.2.2! pgoyette    1: /*     $NetBSD: mld6.c,v 1.74 2016/08/01 03:15:31 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>
1.72.2.2! pgoyette  105: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.74 2016/08/01 03:15:31 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) {
1.72.2.2! pgoyette  405:        case MLD_LISTENER_QUERY: {
        !           406:                struct psref psref;
        !           407:
1.7       itojun    408:                if (ifp->if_flags & IFF_LOOPBACK)
                    409:                        break;
                    410:
1.29      rpaulo    411:                if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    412:                    !IN6_IS_ADDR_MULTICAST(&mld_addr))
1.7       itojun    413:                        break;  /* print error or log stat? */
1.29      rpaulo    414:
                    415:                all_in6 = in6addr_linklocal_allnodes;
                    416:                if (in6_setscope(&all_in6, ifp, NULL)) {
                    417:                        /* XXX: this should not happen! */
                    418:                        break;
                    419:                }
1.2       itojun    420:
1.7       itojun    421:                /*
1.11      itojun    422:                 * - Start the timers in all of our membership records
                    423:                 *   that the query applies to for the interface on
                    424:                 *   which the query arrived excl. those that belong
                    425:                 *   to the "all-nodes" group (ff02::1).
                    426:                 * - Restart any timer that is already running but has
1.30      rpaulo    427:                 *   a value longer than the requested timeout.
1.11      itojun    428:                 * - Use the value specified in the query message as
                    429:                 *   the maximum timeout.
                    430:                 */
1.31      rpaulo    431:                timer = ntohs(mldh->mld_maxdelay);
                    432:
1.72.2.2! pgoyette  433:                ia = in6_get_ia_from_ifp_psref(ifp, &psref);
1.7       itojun    434:                if (ia == NULL)
                    435:                        break;
1.2       itojun    436:
1.72.2.2! pgoyette  437:                /* The following operations may sleep */
        !           438:                m_put_rcvif(ifp, &s);
        !           439:                ifp = NULL;
        !           440:
1.35      dyoung    441:                LIST_FOREACH(in6m, &ia->ia6_multiaddrs, in6m_entry) {
1.29      rpaulo    442:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.7       itojun    443:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
                    444:                            IPV6_ADDR_SCOPE_LINKLOCAL)
                    445:                                continue;
1.2       itojun    446:
1.31      rpaulo    447:                        if (in6m->in6m_state == MLD_REPORTPENDING)
                    448:                                continue; /* we are not yet ready */
                    449:
                    450:                        if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    451:                            !IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr))
                    452:                                continue;
                    453:
                    454:                        if (timer == 0) {
                    455:                                /* send a report immediately */
                    456:                                mld_stoptimer(in6m);
                    457:                                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    458:                                in6m->in6m_state = MLD_IREPORTEDLAST;
                    459:                        } else if (in6m->in6m_timer == IN6M_TIMER_UNDEF ||
1.47      adrianp   460:                            mld_timerresid(in6m) > timer) {
                    461:                                in6m->in6m_timer =
1.55      tls       462:                                   1 + (cprng_fast32() % timer) * hz / 1000;
1.31      rpaulo    463:                                mld_starttimer(in6m);
1.7       itojun    464:                        }
                    465:                }
1.72.2.2! pgoyette  466:                ia6_release(ia, &psref);
1.29      rpaulo    467:                break;
1.72.2.2! pgoyette  468:            }
1.2       itojun    469:
1.22      itojun    470:        case MLD_LISTENER_REPORT:
1.2       itojun    471:                /*
1.11      itojun    472:                 * For fast leave to work, we have to know that we are the
                    473:                 * last person to send a report for this group.  Reports
                    474:                 * can potentially get looped back if we are a multicast
                    475:                 * router, so discard reports sourced by me.
                    476:                 * Note that it is impossible to check IFF_LOOPBACK flag of
                    477:                 * ifp for this purpose, since ip6_mloopback pass the physical
                    478:                 * interface to looutput.
                    479:                 */
1.7       itojun    480:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
                    481:                        break;
                    482:
1.22      itojun    483:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7       itojun    484:                        break;
                    485:
                    486:                /*
1.11      itojun    487:                 * If we belong to the group being reported, stop
                    488:                 * our timer for that group.
                    489:                 */
1.29      rpaulo    490:                IN6_LOOKUP_MULTI(mld_addr, ifp, in6m);
1.7       itojun    491:                if (in6m) {
1.31      rpaulo    492:                        mld_stoptimer(in6m); /* transit to idle state */
1.22      itojun    493:                        in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7       itojun    494:                }
                    495:                break;
                    496:        default:                /* this is impossible */
1.18      itojun    497: #if 0
1.19      itojun    498:                /*
                    499:                 * this case should be impossible because of filtering in
                    500:                 * icmp6_input().  But we explicitly disabled this part
                    501:                 * just in case.
                    502:                 */
1.31      rpaulo    503:                log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld_type);
1.18      itojun    504: #endif
1.7       itojun    505:                break;
1.2       itojun    506:        }
1.11      itojun    507:
1.66      ozaki-r   508: out:
1.11      itojun    509:        m_freem(m);
1.66      ozaki-r   510: out_nodrop:
                    511:        m_put_rcvif(ifp, &s);
1.2       itojun    512: }
                    513:
                    514: static void
1.38      christos  515: mld_sendpkt(struct in6_multi *in6m, int type,
                    516:        const struct in6_addr *dst)
1.2       itojun    517: {
1.31      rpaulo    518:        struct mbuf *mh;
1.22      itojun    519:        struct mld_hdr *mldh;
1.31      rpaulo    520:        struct ip6_hdr *ip6 = NULL;
1.2       itojun    521:        struct ip6_moptions im6o;
1.31      rpaulo    522:        struct in6_ifaddr *ia = NULL;
1.2       itojun    523:        struct ifnet *ifp = in6m->in6m_ifp;
1.19      itojun    524:        int ignflags;
1.72.2.2! pgoyette  525:        struct psref psref;
        !           526:        int bound;
1.2       itojun    527:
                    528:        /*
                    529:         * At first, find a link local address on the outgoing interface
                    530:         * to use as the source address of the MLD packet.
1.19      itojun    531:         * We do not reject tentative addresses for MLD report to deal with
                    532:         * the case where we first join a link-local address.
1.2       itojun    533:         */
1.19      itojun    534:        ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
1.72.2.2! pgoyette  535:        bound = curlwp_bind();
        !           536:        ia = in6ifa_ifpforlinklocal_psref(ifp, ignflags, &psref);
        !           537:        if (ia == NULL) {
        !           538:                curlwp_bindx(bound);
1.2       itojun    539:                return;
1.72.2.2! pgoyette  540:        }
        !           541:        if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
        !           542:                ia6_release(ia, &psref);
1.19      itojun    543:                ia = NULL;
1.72.2.2! pgoyette  544:        }
1.2       itojun    545:
1.31      rpaulo    546:        /* Allocate two mbufs to store IPv6 header and MLD header */
                    547:        mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type);
1.72.2.2! pgoyette  548:        if (mldh == NULL) {
        !           549:                ia6_release(ia, &psref);
        !           550:                curlwp_bindx(bound);
1.2       itojun    551:                return;
1.72.2.2! pgoyette  552:        }
1.2       itojun    553:
1.31      rpaulo    554:        /* fill src/dst here */
                    555:        ip6 = mtod(mh, struct ip6_hdr *);
                    556:        ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
                    557:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
1.72.2.2! pgoyette  558:        ia6_release(ia, &psref);
        !           559:        curlwp_bindx(bound);
1.2       itojun    560:
1.22      itojun    561:        mldh->mld_addr = in6m->in6m_addr;
1.29      rpaulo    562:        in6_clearscope(&mldh->mld_addr); /* XXX */
1.22      itojun    563:        mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
                    564:            sizeof(struct mld_hdr));
1.2       itojun    565:
                    566:        /* construct multicast option */
1.31      rpaulo    567:        memset(&im6o, 0, sizeof(im6o));
1.68      ozaki-r   568:        im6o.im6o_multicast_if_index = if_get_index(ifp);
1.2       itojun    569:        im6o.im6o_multicast_hlim = 1;
                    570:
                    571:        /*
                    572:         * Request loopback of the report if we are acting as a multicast
                    573:         * router, so that the process-level routing daemon can hear it.
                    574:         */
                    575:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    576:
                    577:        /* increment output statictics */
1.44      thorpej   578:        ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
1.15      itojun    579:        icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17      itojun    580:        switch (type) {
1.22      itojun    581:        case MLD_LISTENER_QUERY:
1.15      itojun    582:                icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
                    583:                break;
1.22      itojun    584:        case MLD_LISTENER_REPORT:
1.15      itojun    585:                icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
                    586:                break;
1.22      itojun    587:        case MLD_LISTENER_DONE:
1.15      itojun    588:                icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
                    589:                break;
1.7       itojun    590:        }
1.19      itojun    591:
1.27      perry     592:        ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC,
1.53      plunky    593:            &im6o, NULL, NULL);
1.2       itojun    594: }
1.31      rpaulo    595:
                    596: static struct mld_hdr *
1.34      christos  597: mld_allocbuf(struct mbuf **mh, int len, struct in6_multi *in6m,
1.33      christos  598:     int type)
1.31      rpaulo    599: {
                    600:        struct mbuf *md;
                    601:        struct mld_hdr *mldh;
                    602:        struct ip6_hdr *ip6;
                    603:
                    604:        /*
                    605:         * Allocate mbufs to store ip6 header and MLD header.
                    606:         * We allocate 2 mbufs and make chain in advance because
                    607:         * it is more convenient when inserting the hop-by-hop option later.
                    608:         */
                    609:        MGETHDR(*mh, M_DONTWAIT, MT_HEADER);
                    610:        if (*mh == NULL)
                    611:                return NULL;
                    612:        MGET(md, M_DONTWAIT, MT_DATA);
                    613:        if (md == NULL) {
                    614:                m_free(*mh);
                    615:                *mh = NULL;
                    616:                return NULL;
                    617:        }
                    618:        (*mh)->m_next = md;
                    619:        md->m_next = NULL;
                    620:
1.65      ozaki-r   621:        m_reset_rcvif((*mh));
1.31      rpaulo    622:        (*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len;
                    623:        (*mh)->m_len = sizeof(struct ip6_hdr);
                    624:        MH_ALIGN(*mh, sizeof(struct ip6_hdr));
                    625:
                    626:        /* fill in the ip6 header */
                    627:        ip6 = mtod(*mh, struct ip6_hdr *);
                    628:        memset(ip6, 0, sizeof(*ip6));
                    629:        ip6->ip6_flow = 0;
                    630:        ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
                    631:        ip6->ip6_vfc |= IPV6_VERSION;
                    632:        /* ip6_plen will be set later */
                    633:        ip6->ip6_nxt = IPPROTO_ICMPV6;
                    634:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
                    635:        /* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */
                    636:
                    637:        /* fill in the MLD header as much as possible */
                    638:        md->m_len = len;
                    639:        mldh = mtod(md, struct mld_hdr *);
                    640:        memset(mldh, 0, len);
                    641:        mldh->mld_type = type;
                    642:        return mldh;
                    643: }
                    644:
                    645: /*
                    646:  * Add an address to the list of IP6 multicast addresses for a given interface.
                    647:  */
                    648: struct in6_multi *
1.38      christos  649: in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp,
                    650:        int *errorp, int timer)
1.31      rpaulo    651: {
                    652:        struct  in6_ifaddr *ia;
1.54      dyoung    653:        struct  sockaddr_in6 sin6;
1.31      rpaulo    654:        struct  in6_multi *in6m;
                    655:        int     s = splsoftnet();
                    656:
                    657:        *errorp = 0;
                    658:
                    659:        /*
                    660:         * See if address already in list.
                    661:         */
                    662:        IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
                    663:        if (in6m != NULL) {
                    664:                /*
                    665:                 * Found it; just increment the refrence count.
                    666:                 */
                    667:                in6m->in6m_refcount++;
                    668:        } else {
1.72.2.2! pgoyette  669:                int _s;
1.31      rpaulo    670:                /*
                    671:                 * New address; allocate a new multicast record
                    672:                 * and link it into the interface's multicast list.
                    673:                 */
                    674:                in6m = (struct in6_multi *)
1.51      dyoung    675:                        malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT|M_ZERO);
1.31      rpaulo    676:                if (in6m == NULL) {
                    677:                        splx(s);
                    678:                        *errorp = ENOBUFS;
                    679:                        return (NULL);
                    680:                }
                    681:
                    682:                in6m->in6m_addr = *maddr6;
                    683:                in6m->in6m_ifp = ifp;
                    684:                in6m->in6m_refcount = 1;
                    685:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.64      joerg     686:                callout_init(&in6m->in6m_timer_ch, CALLOUT_MPSAFE);
                    687:                callout_setfunc(&in6m->in6m_timer_ch, mld_timeo, in6m);
                    688:
1.72.2.2! pgoyette  689:                _s = pserialize_read_enter();
1.72      ozaki-r   690:                ia = in6_get_ia_from_ifp(ifp);
1.31      rpaulo    691:                if (ia == NULL) {
1.72.2.2! pgoyette  692:                        pserialize_read_exit(_s);
1.64      joerg     693:                        callout_destroy(&in6m->in6m_timer_ch);
1.31      rpaulo    694:                        free(in6m, M_IPMADDR);
                    695:                        splx(s);
                    696:                        *errorp = EADDRNOTAVAIL; /* appropriate? */
                    697:                        return (NULL);
                    698:                }
                    699:                in6m->in6m_ia = ia;
1.60      rmind     700:                ifaref(&ia->ia_ifa); /* gain a reference */
1.72.2.2! pgoyette  701:                /* FIXME NOMPSAFE: need to lock */
1.31      rpaulo    702:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
1.72.2.2! pgoyette  703:                pserialize_read_exit(_s);
1.31      rpaulo    704:
                    705:                /*
                    706:                 * Ask the network driver to update its multicast reception
                    707:                 * filter appropriately for the new address.
                    708:                 */
1.54      dyoung    709:                sockaddr_in6_init(&sin6, maddr6, 0, 0, 0);
                    710:                *errorp = if_mcast_op(ifp, SIOCADDMULTI, sin6tosa(&sin6));
1.31      rpaulo    711:                if (*errorp) {
1.64      joerg     712:                        callout_destroy(&in6m->in6m_timer_ch);
1.31      rpaulo    713:                        LIST_REMOVE(in6m, in6m_entry);
                    714:                        free(in6m, M_IPMADDR);
1.60      rmind     715:                        ifafree(&ia->ia_ifa);
1.31      rpaulo    716:                        splx(s);
                    717:                        return (NULL);
                    718:                }
                    719:
1.32      rpaulo    720:                in6m->in6m_timer = timer;
1.31      rpaulo    721:                if (in6m->in6m_timer > 0) {
                    722:                        in6m->in6m_state = MLD_REPORTPENDING;
                    723:                        mld_starttimer(in6m);
                    724:
                    725:                        splx(s);
                    726:                        return (in6m);
                    727:                }
                    728:
                    729:                /*
                    730:                 * Let MLD6 know that we have joined a new IP6 multicast
                    731:                 * group.
                    732:                 */
                    733:                mld_start_listening(in6m);
                    734:        }
                    735:        splx(s);
                    736:        return (in6m);
                    737: }
                    738:
                    739: /*
                    740:  * Delete a multicast address record.
                    741:  */
                    742: void
1.38      christos  743: in6_delmulti(struct in6_multi *in6m)
1.31      rpaulo    744: {
1.54      dyoung    745:        struct  sockaddr_in6 sin6;
1.31      rpaulo    746:        struct  in6_ifaddr *ia;
                    747:        int     s = splsoftnet();
                    748:
                    749:        mld_stoptimer(in6m);
                    750:
                    751:        if (--in6m->in6m_refcount == 0) {
1.72.2.1  pgoyette  752:                int _s;
                    753:
1.31      rpaulo    754:                /*
                    755:                 * No remaining claims to this record; let MLD6 know
                    756:                 * that we are leaving the multicast group.
                    757:                 */
                    758:                mld_stop_listening(in6m);
                    759:
                    760:                /*
                    761:                 * Unlink from list.
                    762:                 */
                    763:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    764:                if (in6m->in6m_ia != NULL) {
1.60      rmind     765:                        ifafree(&in6m->in6m_ia->ia_ifa); /* release reference */
1.35      dyoung    766:                        in6m->in6m_ia = NULL;
1.31      rpaulo    767:                }
                    768:
                    769:                /*
                    770:                 * Delete all references of this multicasting group from
                    771:                 * the membership arrays
                    772:                 */
1.72.2.1  pgoyette  773:                _s = pserialize_read_enter();
1.70      ozaki-r   774:                IN6_ADDRLIST_READER_FOREACH(ia) {
1.31      rpaulo    775:                        struct in6_multi_mship *imm;
1.35      dyoung    776:                        LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) {
1.31      rpaulo    777:                                if (imm->i6mm_maddr == in6m)
                    778:                                        imm->i6mm_maddr = NULL;
                    779:                        }
                    780:                }
1.72.2.1  pgoyette  781:                pserialize_read_exit(_s);
1.31      rpaulo    782:
                    783:                /*
                    784:                 * Notify the network driver to update its multicast
                    785:                 * reception filter.
                    786:                 */
1.54      dyoung    787:                sockaddr_in6_init(&sin6, &in6m->in6m_addr, 0, 0, 0);
                    788:                if_mcast_op(in6m->in6m_ifp, SIOCDELMULTI, sin6tosa(&sin6));
1.61      ozaki-r   789:
                    790:                /* Tell mld_timeo we're halting the timer */
                    791:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    792:                callout_halt(&in6m->in6m_timer_ch, softnet_lock);
1.41      joerg     793:                callout_destroy(&in6m->in6m_timer_ch);
1.61      ozaki-r   794:
1.31      rpaulo    795:                free(in6m, M_IPMADDR);
                    796:        }
                    797:        splx(s);
                    798: }
                    799:
                    800:
                    801: struct in6_multi_mship *
1.38      christos  802: in6_joingroup(struct ifnet *ifp, struct in6_addr *addr,
                    803:        int *errorp, int timer)
1.31      rpaulo    804: {
                    805:        struct in6_multi_mship *imm;
                    806:
1.51      dyoung    807:        imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT|M_ZERO);
                    808:        if (imm == NULL) {
1.31      rpaulo    809:                *errorp = ENOBUFS;
                    810:                return NULL;
                    811:        }
                    812:
1.32      rpaulo    813:        imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, timer);
1.31      rpaulo    814:        if (!imm->i6mm_maddr) {
1.36      dyoung    815:                /* *errorp is already set */
1.31      rpaulo    816:                free(imm, M_IPMADDR);
                    817:                return NULL;
                    818:        }
                    819:        return imm;
                    820: }
                    821:
                    822: int
1.38      christos  823: in6_leavegroup(struct in6_multi_mship *imm)
1.31      rpaulo    824: {
                    825:
                    826:        if (imm->i6mm_maddr) {
                    827:                in6_delmulti(imm->i6mm_maddr);
                    828:        }
                    829:        free(imm, M_IPMADDR);
                    830:        return 0;
                    831: }
                    832:
                    833:
                    834: /*
                    835:  * Multicast address kludge:
                    836:  * If there were any multicast addresses attached to this interface address,
                    837:  * either move them to another address on this interface, or save them until
                    838:  * such time as this interface is reconfigured for IPv6.
                    839:  */
                    840: void
1.38      christos  841: in6_savemkludge(struct in6_ifaddr *oia)
1.31      rpaulo    842: {
                    843:        struct in6_ifaddr *ia;
1.36      dyoung    844:        struct in6_multi *in6m;
1.72.2.2! pgoyette  845:        int s;
1.31      rpaulo    846:
1.72.2.2! pgoyette  847:        s = pserialize_read_enter();
1.72      ozaki-r   848:        ia = in6_get_ia_from_ifp(oia->ia_ifp);
1.31      rpaulo    849:        if (ia) {       /* there is another address */
1.36      dyoung    850:                KASSERT(ia != oia);
                    851:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    852:                        LIST_REMOVE(in6m, in6m_entry);
1.60      rmind     853:                        ifaref(&ia->ia_ifa);
                    854:                        ifafree(&in6m->in6m_ia->ia_ifa);
1.31      rpaulo    855:                        in6m->in6m_ia = ia;
1.72.2.2! pgoyette  856:                        /* FIXME NOMPSAFE: need to lock */
1.31      rpaulo    857:                        LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    858:                }
                    859:        } else {        /* last address on this if deleted, save */
                    860:                struct multi6_kludge *mk;
                    861:
1.35      dyoung    862:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    863:                        if (mk->mk_ifp == oia->ia_ifp)
                    864:                                break;
                    865:                }
                    866:                if (mk == NULL) /* this should not happen! */
                    867:                        panic("in6_savemkludge: no kludge space");
                    868:
1.36      dyoung    869:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    870:                        LIST_REMOVE(in6m, in6m_entry);
1.60      rmind     871:                        ifafree(&in6m->in6m_ia->ia_ifa); /* release reference */
1.31      rpaulo    872:                        in6m->in6m_ia = NULL;
                    873:                        LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
                    874:                }
                    875:        }
1.72.2.2! pgoyette  876:        pserialize_read_exit(s);
1.31      rpaulo    877: }
                    878:
                    879: /*
                    880:  * Continuation of multicast address hack:
                    881:  * If there was a multicast group list previously saved for this interface,
                    882:  * then we re-attach it to the first address configured on the i/f.
                    883:  */
                    884: void
1.38      christos  885: in6_restoremkludge(struct in6_ifaddr *ia, struct ifnet *ifp)
1.31      rpaulo    886: {
                    887:        struct multi6_kludge *mk;
1.36      dyoung    888:        struct in6_multi *in6m;
1.31      rpaulo    889:
1.35      dyoung    890:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    891:                if (mk->mk_ifp == ifp)
1.31      rpaulo    892:                        break;
                    893:        }
1.35      dyoung    894:        if (mk == NULL)
                    895:                return;
1.36      dyoung    896:        while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) {
                    897:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    898:                in6m->in6m_ia = ia;
1.60      rmind     899:                ifaref(&ia->ia_ifa);
1.35      dyoung    900:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    901:        }
1.31      rpaulo    902: }
                    903:
                    904: /*
                    905:  * Allocate space for the kludge at interface initialization time.
                    906:  * Formerly, we dynamically allocated the space in in6_savemkludge() with
                    907:  * malloc(M_WAITOK).  However, it was wrong since the function could be called
                    908:  * under an interrupt context (software timer on address lifetime expiration).
                    909:  * Also, we cannot just give up allocating the strucutre, since the group
                    910:  * membership structure is very complex and we need to keep it anyway.
                    911:  * Of course, this function MUST NOT be called under an interrupt context.
                    912:  * Specifically, it is expected to be called only from in6_ifattach(), though
                    913:  * it is a global function.
                    914:  */
                    915: void
1.38      christos  916: in6_createmkludge(struct ifnet *ifp)
1.31      rpaulo    917: {
                    918:        struct multi6_kludge *mk;
                    919:
1.35      dyoung    920:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    921:                /* If we've already had one, do not allocate. */
                    922:                if (mk->mk_ifp == ifp)
                    923:                        return;
                    924:        }
                    925:
1.51      dyoung    926:        mk = malloc(sizeof(*mk), M_IPMADDR, M_ZERO|M_WAITOK);
1.31      rpaulo    927:
                    928:        LIST_INIT(&mk->mk_head);
                    929:        mk->mk_ifp = ifp;
                    930:        LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
                    931: }
                    932:
                    933: void
1.38      christos  934: in6_purgemkludge(struct ifnet *ifp)
1.31      rpaulo    935: {
                    936:        struct multi6_kludge *mk;
1.36      dyoung    937:        struct in6_multi *in6m, *next;
1.31      rpaulo    938:
1.35      dyoung    939:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    940:                if (mk->mk_ifp == ifp)
                    941:                        break;
                    942:        }
                    943:        if (mk == NULL)
                    944:                return;
                    945:
                    946:        /* leave from all multicast groups joined */
1.36      dyoung    947:        for (in6m = LIST_FIRST(&mk->mk_head); in6m != NULL; in6m = next) {
                    948:                next = LIST_NEXT(in6m, in6m_entry);
1.35      dyoung    949:                in6_delmulti(in6m);
1.31      rpaulo    950:        }
1.35      dyoung    951:        LIST_REMOVE(mk, mk_entry);
                    952:        free(mk, M_IPMADDR);
1.31      rpaulo    953: }
1.57      joerg     954:
                    955: static int
                    956: in6_mkludge_sysctl(SYSCTLFN_ARGS)
                    957: {
                    958:        struct multi6_kludge *mk;
                    959:        struct in6_multi *in6m;
                    960:        int error;
                    961:        uint32_t tmp;
                    962:        size_t written;
                    963:
                    964:        if (namelen != 1)
                    965:                return EINVAL;
                    966:
                    967:        if (oldp == NULL) {
                    968:                *oldlenp = 0;
                    969:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    970:                        if (mk->mk_ifp->if_index == name[0])
                    971:                                continue;
                    972:                        LIST_FOREACH(in6m, &mk->mk_head, in6m_entry) {
                    973:                                *oldlenp += sizeof(struct in6_addr) +
                    974:                                    sizeof(uint32_t);
                    975:                        }
                    976:                }
                    977:                return 0;
                    978:        }
                    979:
                    980:        error = 0;
                    981:        written = 0;
                    982:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    983:                if (mk->mk_ifp->if_index == name[0])
                    984:                        continue;
                    985:                LIST_FOREACH(in6m, &mk->mk_head, in6m_entry) {
                    986:                        if (written + sizeof(struct in6_addr) +
                    987:                            sizeof(uint32_t) > *oldlenp)
                    988:                                goto done;
                    989:                        error = sysctl_copyout(l, &in6m->in6m_addr,
                    990:                            oldp, sizeof(struct in6_addr));
                    991:                        if (error)
                    992:                                goto done;
                    993:                        oldp = (char *)oldp + sizeof(struct in6_addr);
                    994:                        written += sizeof(struct in6_addr);
                    995:                        tmp = in6m->in6m_refcount;
                    996:                        error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
                    997:                        if (error)
                    998:                                goto done;
                    999:                        oldp = (char *)oldp + sizeof(tmp);
                   1000:                        written += sizeof(tmp);
                   1001:                }
                   1002:        }
                   1003:
                   1004: done:
                   1005:        *oldlenp = written;
                   1006:        return error;
                   1007: }
                   1008:
                   1009: static int
                   1010: in6_multicast_sysctl(SYSCTLFN_ARGS)
                   1011: {
                   1012:        struct ifnet *ifp;
                   1013:        struct ifaddr *ifa;
                   1014:        struct in6_ifaddr *ifa6;
                   1015:        struct in6_multi *in6m;
                   1016:        uint32_t tmp;
                   1017:        int error;
                   1018:        size_t written;
1.72.2.2! pgoyette 1019:        struct psref psref, psref_ia;
        !          1020:        int bound, s;
1.57      joerg    1021:
                   1022:        if (namelen != 1)
                   1023:                return EINVAL;
                   1024:
1.67      ozaki-r  1025:        bound = curlwp_bind();
                   1026:        ifp = if_get_byindex(name[0], &psref);
                   1027:        if (ifp == NULL) {
                   1028:                curlwp_bindx(bound);
1.57      joerg    1029:                return ENODEV;
1.67      ozaki-r  1030:        }
1.57      joerg    1031:
                   1032:        if (oldp == NULL) {
                   1033:                *oldlenp = 0;
1.72.2.2! pgoyette 1034:                s = pserialize_read_enter();
1.71      ozaki-r  1035:                IFADDR_READER_FOREACH(ifa, ifp) {
1.57      joerg    1036:                        if (ifa->ifa_addr->sa_family != AF_INET6)
                   1037:                                continue;
                   1038:                        ifa6 = (struct in6_ifaddr *)ifa;
                   1039:                        LIST_FOREACH(in6m, &ifa6->ia6_multiaddrs, in6m_entry) {
                   1040:                                *oldlenp += 2 * sizeof(struct in6_addr) +
                   1041:                                    sizeof(uint32_t);
                   1042:                        }
                   1043:                }
1.72.2.2! pgoyette 1044:                pserialize_read_exit(s);
1.67      ozaki-r  1045:                if_put(ifp, &psref);
                   1046:                curlwp_bindx(bound);
1.57      joerg    1047:                return 0;
                   1048:        }
                   1049:
                   1050:        error = 0;
                   1051:        written = 0;
1.72.2.2! pgoyette 1052:        s = pserialize_read_enter();
1.71      ozaki-r  1053:        IFADDR_READER_FOREACH(ifa, ifp) {
1.57      joerg    1054:                if (ifa->ifa_addr->sa_family != AF_INET6)
                   1055:                        continue;
1.72.2.2! pgoyette 1056:
        !          1057:                ifa_acquire(ifa, &psref_ia);
        !          1058:                pserialize_read_exit(s);
        !          1059:
1.57      joerg    1060:                ifa6 = (struct in6_ifaddr *)ifa;
                   1061:                LIST_FOREACH(in6m, &ifa6->ia6_multiaddrs, in6m_entry) {
                   1062:                        if (written + 2 * sizeof(struct in6_addr) +
                   1063:                            sizeof(uint32_t) > *oldlenp)
                   1064:                                goto done;
                   1065:                        error = sysctl_copyout(l, &ifa6->ia_addr.sin6_addr,
                   1066:                            oldp, sizeof(struct in6_addr));
                   1067:                        if (error)
                   1068:                                goto done;
                   1069:                        oldp = (char *)oldp + sizeof(struct in6_addr);
                   1070:                        written += sizeof(struct in6_addr);
                   1071:                        error = sysctl_copyout(l, &in6m->in6m_addr,
                   1072:                            oldp, sizeof(struct in6_addr));
                   1073:                        if (error)
                   1074:                                goto done;
                   1075:                        oldp = (char *)oldp + sizeof(struct in6_addr);
                   1076:                        written += sizeof(struct in6_addr);
                   1077:                        tmp = in6m->in6m_refcount;
                   1078:                        error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
                   1079:                        if (error)
                   1080:                                goto done;
                   1081:                        oldp = (char *)oldp + sizeof(tmp);
                   1082:                        written += sizeof(tmp);
                   1083:                }
1.72.2.2! pgoyette 1084:
        !          1085:                s = pserialize_read_enter();
        !          1086:                ifa_release(ifa, &psref_ia);
1.57      joerg    1087:        }
1.72.2.2! pgoyette 1088:        pserialize_read_exit(s);
1.57      joerg    1089: done:
1.72.2.2! pgoyette 1090:        ifa_release(ifa, &psref_ia);
1.67      ozaki-r  1091:        if_put(ifp, &psref);
                   1092:        curlwp_bindx(bound);
1.57      joerg    1093:        *oldlenp = written;
                   1094:        return error;
                   1095: }
                   1096:
                   1097: SYSCTL_SETUP(sysctl_in6_mklude_setup, "sysctl net.inet6.multicast_kludge subtree setup")
                   1098: {
                   1099:
                   1100:        sysctl_createv(clog, 0, NULL, NULL,
                   1101:                       CTLFLAG_PERMANENT,
1.59      joerg    1102:                       CTLTYPE_NODE, "inet6", NULL,
                   1103:                       NULL, 0, NULL, 0,
                   1104:                       CTL_NET, PF_INET6, CTL_EOL);
                   1105:
                   1106:        sysctl_createv(clog, 0, NULL, NULL,
                   1107:                       CTLFLAG_PERMANENT,
1.57      joerg    1108:                       CTLTYPE_NODE, "multicast",
                   1109:                       SYSCTL_DESCR("Multicast information"),
                   1110:                       in6_multicast_sysctl, 0, NULL, 0,
                   1111:                       CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL);
                   1112:
                   1113:        sysctl_createv(clog, 0, NULL, NULL,
                   1114:                       CTLFLAG_PERMANENT,
                   1115:                       CTLTYPE_NODE, "multicast_kludge",
                   1116:                       SYSCTL_DESCR("multicast kludge information"),
                   1117:                       in6_mkludge_sysctl, 0, NULL, 0,
                   1118:                       CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL);
                   1119: }

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