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Annotation of src/sys/netinet6/mld6.c, Revision 1.76

1.76    ! ozaki-r     1: /*     $NetBSD: mld6.c,v 1.75 2016/11/18 06:50:04 knakahara 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>
1.76    ! ozaki-r   105: __KERNEL_RCSID(0, "$NetBSD: mld6.c,v 1.75 2016/11/18 06:50:04 knakahara Exp $");
1.2       itojun    106:
1.63      pooka     107: #ifdef _KERNEL_OPT
1.2       itojun    108: #include "opt_inet.h"
1.75      knakahar  109: #include "opt_net_mpsafe.h"
1.63      pooka     110: #endif
1.2       itojun    111:
                    112: #include <sys/param.h>
                    113: #include <sys/systm.h>
                    114: #include <sys/mbuf.h>
                    115: #include <sys/socket.h>
1.45      ad        116: #include <sys/socketvar.h>
1.2       itojun    117: #include <sys/protosw.h>
                    118: #include <sys/syslog.h>
1.31      rpaulo    119: #include <sys/sysctl.h>
                    120: #include <sys/kernel.h>
                    121: #include <sys/callout.h>
1.55      tls       122: #include <sys/cprng.h>
1.2       itojun    123:
                    124: #include <net/if.h>
                    125:
                    126: #include <netinet/in.h>
                    127: #include <netinet/in_var.h>
1.31      rpaulo    128: #include <netinet6/in6_var.h>
1.10      itojun    129: #include <netinet/ip6.h>
1.2       itojun    130: #include <netinet6/ip6_var.h>
1.29      rpaulo    131: #include <netinet6/scope6_var.h>
1.10      itojun    132: #include <netinet/icmp6.h>
1.44      thorpej   133: #include <netinet6/icmp6_private.h>
1.2       itojun    134: #include <netinet6/mld6_var.h>
                    135:
1.7       itojun    136: #include <net/net_osdep.h>
                    137:
1.31      rpaulo    138:
                    139: /*
                    140:  * This structure is used to keep track of in6_multi chains which belong to
                    141:  * deleted interface addresses.
                    142:  */
1.56      joerg     143: static LIST_HEAD(, multi6_kludge) in6_mk = LIST_HEAD_INITIALIZER(in6_mk);
1.31      rpaulo    144:
                    145: struct multi6_kludge {
                    146:        LIST_ENTRY(multi6_kludge) mk_entry;
                    147:        struct ifnet *mk_ifp;
                    148:        struct in6_multihead mk_head;
                    149: };
                    150:
                    151:
1.2       itojun    152: /*
                    153:  * Protocol constants
                    154:  */
                    155:
                    156: /*
                    157:  * time between repetitions of a node's initial report of interest in a
                    158:  * multicast address(in seconds)
                    159:  */
1.22      itojun    160: #define MLD_UNSOLICITED_REPORT_INTERVAL        10
1.2       itojun    161:
                    162: static struct ip6_pktopts ip6_opts;
                    163:
1.31      rpaulo    164: static void mld_start_listening(struct in6_multi *);
                    165: static void mld_stop_listening(struct in6_multi *);
                    166:
                    167: static struct mld_hdr * mld_allocbuf(struct mbuf **, int, struct in6_multi *,
                    168:        int);
                    169: static void mld_sendpkt(struct in6_multi *, int, const struct in6_addr *);
                    170: static void mld_starttimer(struct in6_multi *);
                    171: static void mld_stoptimer(struct in6_multi *);
                    172: static u_long mld_timerresid(struct in6_multi *);
1.2       itojun    173:
                    174: void
1.42      matt      175: mld_init(void)
1.2       itojun    176: {
                    177:        static u_int8_t hbh_buf[8];
                    178:        struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf;
                    179:        u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD);
                    180:
                    181:        /* ip6h_nxt will be fill in later */
1.11      itojun    182:        hbh->ip6h_len = 0;      /* (8 >> 3) - 1 */
1.2       itojun    183:
                    184:        /* XXX: grotty hard coding... */
                    185:        hbh_buf[2] = IP6OPT_PADN;       /* 2 byte padding */
                    186:        hbh_buf[3] = 0;
                    187:        hbh_buf[4] = IP6OPT_RTALERT;
                    188:        hbh_buf[5] = IP6OPT_RTALERT_LEN - 2;
1.50      tsutsui   189:        memcpy(&hbh_buf[6], (void *)&rtalert_code, sizeof(u_int16_t));
1.2       itojun    190:
                    191:        ip6_opts.ip6po_hbh = hbh;
                    192:        /* We will specify the hoplimit by a multicast option. */
                    193:        ip6_opts.ip6po_hlim = -1;
1.62      roy       194:        ip6_opts.ip6po_prefer_tempaddr = IP6PO_TEMPADDR_NOTPREFER;
1.2       itojun    195: }
                    196:
1.31      rpaulo    197: static void
1.38      christos  198: mld_starttimer(struct in6_multi *in6m)
1.31      rpaulo    199: {
                    200:        struct timeval now;
                    201:
1.61      ozaki-r   202:        KASSERT(in6m->in6m_timer != IN6M_TIMER_UNDEF);
                    203:
1.31      rpaulo    204:        microtime(&now);
                    205:        in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz;
                    206:        in6m->in6m_timer_expire.tv_usec = now.tv_usec +
                    207:            (in6m->in6m_timer % hz) * (1000000 / hz);
                    208:        if (in6m->in6m_timer_expire.tv_usec > 1000000) {
                    209:                in6m->in6m_timer_expire.tv_sec++;
                    210:                in6m->in6m_timer_expire.tv_usec -= 1000000;
                    211:        }
                    212:
                    213:        /* start or restart the timer */
1.41      joerg     214:        callout_schedule(&in6m->in6m_timer_ch, in6m->in6m_timer);
1.31      rpaulo    215: }
                    216:
                    217: static void
1.38      christos  218: mld_stoptimer(struct in6_multi *in6m)
1.31      rpaulo    219: {
                    220:        if (in6m->in6m_timer == IN6M_TIMER_UNDEF)
                    221:                return;
                    222:
1.41      joerg     223:        callout_stop(&in6m->in6m_timer_ch);
1.31      rpaulo    224:
                    225:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    226: }
                    227:
                    228: static void
1.41      joerg     229: mld_timeo(void *arg)
1.31      rpaulo    230: {
1.41      joerg     231:        struct in6_multi *in6m = arg;
1.45      ad        232:
                    233:        mutex_enter(softnet_lock);
                    234:        KERNEL_LOCK(1, NULL);
1.31      rpaulo    235:
1.61      ozaki-r   236:        if (in6m->in6m_timer == IN6M_TIMER_UNDEF)
                    237:                goto out;
                    238:
1.31      rpaulo    239:        in6m->in6m_timer = IN6M_TIMER_UNDEF;
                    240:
                    241:        switch (in6m->in6m_state) {
                    242:        case MLD_REPORTPENDING:
                    243:                mld_start_listening(in6m);
                    244:                break;
                    245:        default:
                    246:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    247:                break;
                    248:        }
                    249:
1.61      ozaki-r   250: out:
1.45      ad        251:        KERNEL_UNLOCK_ONE(NULL);
                    252:        mutex_exit(softnet_lock);
1.31      rpaulo    253: }
                    254:
                    255: static u_long
1.38      christos  256: mld_timerresid(struct in6_multi *in6m)
1.31      rpaulo    257: {
                    258:        struct timeval now, diff;
                    259:
                    260:        microtime(&now);
                    261:
                    262:        if (now.tv_sec > in6m->in6m_timer_expire.tv_sec ||
                    263:            (now.tv_sec == in6m->in6m_timer_expire.tv_sec &&
                    264:            now.tv_usec > in6m->in6m_timer_expire.tv_usec)) {
                    265:                return (0);
                    266:        }
                    267:        diff = in6m->in6m_timer_expire;
                    268:        diff.tv_sec -= now.tv_sec;
                    269:        diff.tv_usec -= now.tv_usec;
                    270:        if (diff.tv_usec < 0) {
                    271:                diff.tv_sec--;
                    272:                diff.tv_usec += 1000000;
                    273:        }
                    274:
                    275:        /* return the remaining time in milliseconds */
1.47      adrianp   276:        return diff.tv_sec * 1000 + diff.tv_usec / 1000;
1.31      rpaulo    277: }
                    278:
                    279: static void
1.38      christos  280: mld_start_listening(struct in6_multi *in6m)
1.2       itojun    281: {
1.29      rpaulo    282:        struct in6_addr all_in6;
                    283:
1.2       itojun    284:        /*
1.11      itojun    285:         * RFC2710 page 10:
1.2       itojun    286:         * The node never sends a Report or Done for the link-scope all-nodes
                    287:         * address.
                    288:         * MLD messages are never sent for multicast addresses whose scope is 0
                    289:         * (reserved) or 1 (node-local).
                    290:         */
1.29      rpaulo    291:        all_in6 = in6addr_linklocal_allnodes;
                    292:        if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) {
                    293:                /* XXX: this should not happen! */
                    294:                in6m->in6m_timer = 0;
                    295:                in6m->in6m_state = MLD_OTHERLISTENER;
                    296:        }
                    297:        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.2       itojun    298:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) {
1.31      rpaulo    299:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.22      itojun    300:                in6m->in6m_state = MLD_OTHERLISTENER;
1.2       itojun    301:        } else {
1.31      rpaulo    302:                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
1.55      tls       303:                in6m->in6m_timer = cprng_fast32() %
1.31      rpaulo    304:                    (MLD_UNSOLICITED_REPORT_INTERVAL * hz);
1.22      itojun    305:                in6m->in6m_state = MLD_IREPORTEDLAST;
1.31      rpaulo    306:
                    307:                mld_starttimer(in6m);
1.2       itojun    308:        }
                    309: }
                    310:
1.31      rpaulo    311: static void
1.38      christos  312: mld_stop_listening(struct in6_multi *in6m)
1.2       itojun    313: {
1.29      rpaulo    314:        struct in6_addr allnode, allrouter;
                    315:
                    316:        allnode = in6addr_linklocal_allnodes;
                    317:        if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) {
                    318:                /* XXX: this should not happen! */
                    319:                return;
                    320:        }
                    321:        allrouter = in6addr_linklocal_allrouters;
                    322:        if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) {
                    323:                /* XXX impossible */
                    324:                return;
                    325:        }
1.2       itojun    326:
1.22      itojun    327:        if (in6m->in6m_state == MLD_IREPORTEDLAST &&
1.29      rpaulo    328:            (!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode)) &&
                    329:            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) >
                    330:            IPV6_ADDR_SCOPE_INTFACELOCAL) {
1.31      rpaulo    331:                mld_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter);
1.29      rpaulo    332:        }
1.2       itojun    333: }
                    334:
                    335: void
1.38      christos  336: mld_input(struct mbuf *m, int off)
1.2       itojun    337: {
1.52      dholland  338:        struct ip6_hdr *ip6;
1.22      itojun    339:        struct mld_hdr *mldh;
1.66      ozaki-r   340:        struct ifnet *ifp;
1.31      rpaulo    341:        struct in6_multi *in6m = NULL;
1.29      rpaulo    342:        struct in6_addr mld_addr, all_in6;
1.2       itojun    343:        struct in6_ifaddr *ia;
1.47      adrianp   344:        u_long timer = 0;       /* timer value in the MLD query header */
1.66      ozaki-r   345:        int s;
1.2       itojun    346:
1.66      ozaki-r   347:        ifp = m_get_rcvif(m, &s);
1.22      itojun    348:        IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh));
1.13      itojun    349:        if (mldh == NULL) {
1.44      thorpej   350:                ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1.66      ozaki-r   351:                goto out_nodrop;
1.13      itojun    352:        }
                    353:
1.2       itojun    354:        /* source address validation */
1.13      itojun    355:        ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */
1.2       itojun    356:        if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
1.31      rpaulo    357:                /*
                    358:                 * RFC3590 allows the IPv6 unspecified address as the source
                    359:                 * address of MLD report and done messages.  However, as this
                    360:                 * same document says, this special rule is for snooping
                    361:                 * switches and the RFC requires routers to discard MLD packets
                    362:                 * with the unspecified source address.  The RFC only talks
                    363:                 * about hosts receiving an MLD query or report in Security
                    364:                 * Considerations, but this is probably the correct intention.
                    365:                 * RFC3590 does not talk about other cases than link-local and
                    366:                 * the unspecified source addresses, but we believe the same
                    367:                 * rule should be applied.
                    368:                 * As a result, we only allow link-local addresses as the
                    369:                 * source address; otherwise, simply discard the packet.
                    370:                 */
1.18      itojun    371: #if 0
1.31      rpaulo    372:                /*
                    373:                 * XXX: do not log in an input path to avoid log flooding,
                    374:                 * though RFC3590 says "SHOULD log" if the source of a query
                    375:                 * is the unspecified address.
                    376:                 */
                    377:                log(LOG_INFO,
1.22      itojun    378:                    "mld_input: src %s is not link-local (grp=%s)\n",
1.31      rpaulo    379:                    ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&mldh->mld_addr));
1.18      itojun    380: #endif
1.66      ozaki-r   381:                goto out;
1.2       itojun    382:        }
                    383:
                    384:        /*
1.29      rpaulo    385:         * make a copy for local work (in6_setscope() may modify the 1st arg)
                    386:         */
                    387:        mld_addr = mldh->mld_addr;
                    388:        if (in6_setscope(&mld_addr, ifp, NULL)) {
                    389:                /* XXX: this should not happen! */
1.66      ozaki-r   390:                goto out;
1.29      rpaulo    391:        }
                    392:
                    393:        /*
1.31      rpaulo    394:         * In the MLD specification, there are 3 states and a flag.
1.2       itojun    395:         *
                    396:         * In Non-Listener state, we simply don't have a membership record.
                    397:         * In Delaying Listener state, our timer is running (in6m->in6m_timer)
1.31      rpaulo    398:         * In Idle Listener state, our timer is not running
                    399:         * (in6m->in6m_timer==IN6M_TIMER_UNDEF)
1.2       itojun    400:         *
1.22      itojun    401:         * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if
                    402:         * we have heard a report from another member, or MLD_IREPORTEDLAST
1.2       itojun    403:         * if we sent the last report.
                    404:         */
1.22      itojun    405:        switch (mldh->mld_type) {
1.74      ozaki-r   406:        case MLD_LISTENER_QUERY: {
                    407:                struct psref psref;
                    408:
1.7       itojun    409:                if (ifp->if_flags & IFF_LOOPBACK)
                    410:                        break;
                    411:
1.29      rpaulo    412:                if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    413:                    !IN6_IS_ADDR_MULTICAST(&mld_addr))
1.7       itojun    414:                        break;  /* print error or log stat? */
1.29      rpaulo    415:
                    416:                all_in6 = in6addr_linklocal_allnodes;
                    417:                if (in6_setscope(&all_in6, ifp, NULL)) {
                    418:                        /* XXX: this should not happen! */
                    419:                        break;
                    420:                }
1.2       itojun    421:
1.7       itojun    422:                /*
1.11      itojun    423:                 * - Start the timers in all of our membership records
                    424:                 *   that the query applies to for the interface on
                    425:                 *   which the query arrived excl. those that belong
                    426:                 *   to the "all-nodes" group (ff02::1).
                    427:                 * - Restart any timer that is already running but has
1.30      rpaulo    428:                 *   a value longer than the requested timeout.
1.11      itojun    429:                 * - Use the value specified in the query message as
                    430:                 *   the maximum timeout.
                    431:                 */
1.31      rpaulo    432:                timer = ntohs(mldh->mld_maxdelay);
                    433:
1.74      ozaki-r   434:                ia = in6_get_ia_from_ifp_psref(ifp, &psref);
1.7       itojun    435:                if (ia == NULL)
                    436:                        break;
1.2       itojun    437:
1.74      ozaki-r   438:                /* The following operations may sleep */
                    439:                m_put_rcvif(ifp, &s);
                    440:                ifp = NULL;
                    441:
1.35      dyoung    442:                LIST_FOREACH(in6m, &ia->ia6_multiaddrs, in6m_entry) {
1.29      rpaulo    443:                        if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) ||
1.7       itojun    444:                            IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) <
                    445:                            IPV6_ADDR_SCOPE_LINKLOCAL)
                    446:                                continue;
1.2       itojun    447:
1.31      rpaulo    448:                        if (in6m->in6m_state == MLD_REPORTPENDING)
                    449:                                continue; /* we are not yet ready */
                    450:
                    451:                        if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) &&
                    452:                            !IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr))
                    453:                                continue;
                    454:
                    455:                        if (timer == 0) {
                    456:                                /* send a report immediately */
                    457:                                mld_stoptimer(in6m);
                    458:                                mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL);
                    459:                                in6m->in6m_state = MLD_IREPORTEDLAST;
                    460:                        } else if (in6m->in6m_timer == IN6M_TIMER_UNDEF ||
1.47      adrianp   461:                            mld_timerresid(in6m) > timer) {
                    462:                                in6m->in6m_timer =
1.55      tls       463:                                   1 + (cprng_fast32() % timer) * hz / 1000;
1.31      rpaulo    464:                                mld_starttimer(in6m);
1.7       itojun    465:                        }
                    466:                }
1.74      ozaki-r   467:                ia6_release(ia, &psref);
1.29      rpaulo    468:                break;
1.74      ozaki-r   469:            }
1.2       itojun    470:
1.22      itojun    471:        case MLD_LISTENER_REPORT:
1.2       itojun    472:                /*
1.11      itojun    473:                 * For fast leave to work, we have to know that we are the
                    474:                 * last person to send a report for this group.  Reports
                    475:                 * can potentially get looped back if we are a multicast
                    476:                 * router, so discard reports sourced by me.
                    477:                 * Note that it is impossible to check IFF_LOOPBACK flag of
                    478:                 * ifp for this purpose, since ip6_mloopback pass the physical
                    479:                 * interface to looutput.
                    480:                 */
1.7       itojun    481:                if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */
                    482:                        break;
                    483:
1.22      itojun    484:                if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr))
1.7       itojun    485:                        break;
                    486:
                    487:                /*
1.11      itojun    488:                 * If we belong to the group being reported, stop
                    489:                 * our timer for that group.
                    490:                 */
1.29      rpaulo    491:                IN6_LOOKUP_MULTI(mld_addr, ifp, in6m);
1.7       itojun    492:                if (in6m) {
1.31      rpaulo    493:                        mld_stoptimer(in6m); /* transit to idle state */
1.22      itojun    494:                        in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */
1.7       itojun    495:                }
                    496:                break;
                    497:        default:                /* this is impossible */
1.18      itojun    498: #if 0
1.19      itojun    499:                /*
                    500:                 * this case should be impossible because of filtering in
                    501:                 * icmp6_input().  But we explicitly disabled this part
                    502:                 * just in case.
                    503:                 */
1.31      rpaulo    504:                log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld_type);
1.18      itojun    505: #endif
1.7       itojun    506:                break;
1.2       itojun    507:        }
1.11      itojun    508:
1.66      ozaki-r   509: out:
1.11      itojun    510:        m_freem(m);
1.66      ozaki-r   511: out_nodrop:
                    512:        m_put_rcvif(ifp, &s);
1.2       itojun    513: }
                    514:
                    515: static void
1.38      christos  516: mld_sendpkt(struct in6_multi *in6m, int type,
                    517:        const struct in6_addr *dst)
1.2       itojun    518: {
1.31      rpaulo    519:        struct mbuf *mh;
1.22      itojun    520:        struct mld_hdr *mldh;
1.31      rpaulo    521:        struct ip6_hdr *ip6 = NULL;
1.2       itojun    522:        struct ip6_moptions im6o;
1.31      rpaulo    523:        struct in6_ifaddr *ia = NULL;
1.2       itojun    524:        struct ifnet *ifp = in6m->in6m_ifp;
1.19      itojun    525:        int ignflags;
1.74      ozaki-r   526:        struct psref psref;
                    527:        int bound;
1.2       itojun    528:
                    529:        /*
                    530:         * At first, find a link local address on the outgoing interface
                    531:         * to use as the source address of the MLD packet.
1.19      itojun    532:         * We do not reject tentative addresses for MLD report to deal with
                    533:         * the case where we first join a link-local address.
1.2       itojun    534:         */
1.19      itojun    535:        ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE;
1.74      ozaki-r   536:        bound = curlwp_bind();
                    537:        ia = in6ifa_ifpforlinklocal_psref(ifp, ignflags, &psref);
                    538:        if (ia == NULL) {
                    539:                curlwp_bindx(bound);
1.2       itojun    540:                return;
1.74      ozaki-r   541:        }
                    542:        if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
                    543:                ia6_release(ia, &psref);
1.19      itojun    544:                ia = NULL;
1.74      ozaki-r   545:        }
1.2       itojun    546:
1.31      rpaulo    547:        /* Allocate two mbufs to store IPv6 header and MLD header */
                    548:        mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type);
1.74      ozaki-r   549:        if (mldh == NULL) {
                    550:                ia6_release(ia, &psref);
                    551:                curlwp_bindx(bound);
1.2       itojun    552:                return;
1.74      ozaki-r   553:        }
1.2       itojun    554:
1.31      rpaulo    555:        /* fill src/dst here */
                    556:        ip6 = mtod(mh, struct ip6_hdr *);
                    557:        ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any;
                    558:        ip6->ip6_dst = dst ? *dst : in6m->in6m_addr;
1.74      ozaki-r   559:        ia6_release(ia, &psref);
                    560:        curlwp_bindx(bound);
1.2       itojun    561:
1.22      itojun    562:        mldh->mld_addr = in6m->in6m_addr;
1.29      rpaulo    563:        in6_clearscope(&mldh->mld_addr); /* XXX */
1.22      itojun    564:        mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr),
                    565:            sizeof(struct mld_hdr));
1.2       itojun    566:
                    567:        /* construct multicast option */
1.31      rpaulo    568:        memset(&im6o, 0, sizeof(im6o));
1.68      ozaki-r   569:        im6o.im6o_multicast_if_index = if_get_index(ifp);
1.2       itojun    570:        im6o.im6o_multicast_hlim = 1;
                    571:
                    572:        /*
                    573:         * Request loopback of the report if we are acting as a multicast
                    574:         * router, so that the process-level routing daemon can hear it.
                    575:         */
                    576:        im6o.im6o_multicast_loop = (ip6_mrouter != NULL);
                    577:
                    578:        /* increment output statictics */
1.44      thorpej   579:        ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
1.15      itojun    580:        icmp6_ifstat_inc(ifp, ifs6_out_msg);
1.17      itojun    581:        switch (type) {
1.22      itojun    582:        case MLD_LISTENER_QUERY:
1.15      itojun    583:                icmp6_ifstat_inc(ifp, ifs6_out_mldquery);
                    584:                break;
1.22      itojun    585:        case MLD_LISTENER_REPORT:
1.15      itojun    586:                icmp6_ifstat_inc(ifp, ifs6_out_mldreport);
                    587:                break;
1.22      itojun    588:        case MLD_LISTENER_DONE:
1.15      itojun    589:                icmp6_ifstat_inc(ifp, ifs6_out_mlddone);
                    590:                break;
1.7       itojun    591:        }
1.19      itojun    592:
1.27      perry     593:        ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC,
1.53      plunky    594:            &im6o, NULL, NULL);
1.2       itojun    595: }
1.31      rpaulo    596:
                    597: static struct mld_hdr *
1.34      christos  598: mld_allocbuf(struct mbuf **mh, int len, struct in6_multi *in6m,
1.33      christos  599:     int type)
1.31      rpaulo    600: {
                    601:        struct mbuf *md;
                    602:        struct mld_hdr *mldh;
                    603:        struct ip6_hdr *ip6;
                    604:
                    605:        /*
                    606:         * Allocate mbufs to store ip6 header and MLD header.
                    607:         * We allocate 2 mbufs and make chain in advance because
                    608:         * it is more convenient when inserting the hop-by-hop option later.
                    609:         */
                    610:        MGETHDR(*mh, M_DONTWAIT, MT_HEADER);
                    611:        if (*mh == NULL)
                    612:                return NULL;
                    613:        MGET(md, M_DONTWAIT, MT_DATA);
                    614:        if (md == NULL) {
                    615:                m_free(*mh);
                    616:                *mh = NULL;
                    617:                return NULL;
                    618:        }
                    619:        (*mh)->m_next = md;
                    620:        md->m_next = NULL;
                    621:
1.65      ozaki-r   622:        m_reset_rcvif((*mh));
1.31      rpaulo    623:        (*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len;
                    624:        (*mh)->m_len = sizeof(struct ip6_hdr);
                    625:        MH_ALIGN(*mh, sizeof(struct ip6_hdr));
                    626:
                    627:        /* fill in the ip6 header */
                    628:        ip6 = mtod(*mh, struct ip6_hdr *);
                    629:        memset(ip6, 0, sizeof(*ip6));
                    630:        ip6->ip6_flow = 0;
                    631:        ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
                    632:        ip6->ip6_vfc |= IPV6_VERSION;
                    633:        /* ip6_plen will be set later */
                    634:        ip6->ip6_nxt = IPPROTO_ICMPV6;
                    635:        /* ip6_hlim will be set by im6o.im6o_multicast_hlim */
                    636:        /* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */
                    637:
                    638:        /* fill in the MLD header as much as possible */
                    639:        md->m_len = len;
                    640:        mldh = mtod(md, struct mld_hdr *);
                    641:        memset(mldh, 0, len);
                    642:        mldh->mld_type = type;
                    643:        return mldh;
                    644: }
                    645:
                    646: /*
                    647:  * Add an address to the list of IP6 multicast addresses for a given interface.
                    648:  */
                    649: struct in6_multi *
1.38      christos  650: in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp,
                    651:        int *errorp, int timer)
1.31      rpaulo    652: {
                    653:        struct  in6_ifaddr *ia;
1.54      dyoung    654:        struct  sockaddr_in6 sin6;
1.31      rpaulo    655:        struct  in6_multi *in6m;
                    656:        int     s = splsoftnet();
                    657:
                    658:        *errorp = 0;
                    659:
                    660:        /*
                    661:         * See if address already in list.
                    662:         */
                    663:        IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
                    664:        if (in6m != NULL) {
                    665:                /*
                    666:                 * Found it; just increment the refrence count.
                    667:                 */
                    668:                in6m->in6m_refcount++;
                    669:        } else {
1.74      ozaki-r   670:                int _s;
1.31      rpaulo    671:                /*
                    672:                 * New address; allocate a new multicast record
                    673:                 * and link it into the interface's multicast list.
                    674:                 */
                    675:                in6m = (struct in6_multi *)
1.51      dyoung    676:                        malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT|M_ZERO);
1.31      rpaulo    677:                if (in6m == NULL) {
                    678:                        splx(s);
                    679:                        *errorp = ENOBUFS;
                    680:                        return (NULL);
                    681:                }
                    682:
                    683:                in6m->in6m_addr = *maddr6;
                    684:                in6m->in6m_ifp = ifp;
                    685:                in6m->in6m_refcount = 1;
                    686:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.64      joerg     687:                callout_init(&in6m->in6m_timer_ch, CALLOUT_MPSAFE);
                    688:                callout_setfunc(&in6m->in6m_timer_ch, mld_timeo, in6m);
                    689:
1.74      ozaki-r   690:                _s = pserialize_read_enter();
1.72      ozaki-r   691:                ia = in6_get_ia_from_ifp(ifp);
1.31      rpaulo    692:                if (ia == NULL) {
1.74      ozaki-r   693:                        pserialize_read_exit(_s);
1.64      joerg     694:                        callout_destroy(&in6m->in6m_timer_ch);
1.31      rpaulo    695:                        free(in6m, M_IPMADDR);
                    696:                        splx(s);
                    697:                        *errorp = EADDRNOTAVAIL; /* appropriate? */
                    698:                        return (NULL);
                    699:                }
                    700:                in6m->in6m_ia = ia;
1.60      rmind     701:                ifaref(&ia->ia_ifa); /* gain a reference */
1.74      ozaki-r   702:                /* FIXME NOMPSAFE: need to lock */
1.31      rpaulo    703:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
1.74      ozaki-r   704:                pserialize_read_exit(_s);
1.31      rpaulo    705:
                    706:                /*
                    707:                 * Ask the network driver to update its multicast reception
                    708:                 * filter appropriately for the new address.
                    709:                 */
1.54      dyoung    710:                sockaddr_in6_init(&sin6, maddr6, 0, 0, 0);
                    711:                *errorp = if_mcast_op(ifp, SIOCADDMULTI, sin6tosa(&sin6));
1.31      rpaulo    712:                if (*errorp) {
1.64      joerg     713:                        callout_destroy(&in6m->in6m_timer_ch);
1.31      rpaulo    714:                        LIST_REMOVE(in6m, in6m_entry);
                    715:                        free(in6m, M_IPMADDR);
1.60      rmind     716:                        ifafree(&ia->ia_ifa);
1.31      rpaulo    717:                        splx(s);
                    718:                        return (NULL);
                    719:                }
                    720:
1.32      rpaulo    721:                in6m->in6m_timer = timer;
1.31      rpaulo    722:                if (in6m->in6m_timer > 0) {
                    723:                        in6m->in6m_state = MLD_REPORTPENDING;
                    724:                        mld_starttimer(in6m);
                    725:
                    726:                        splx(s);
                    727:                        return (in6m);
                    728:                }
                    729:
                    730:                /*
                    731:                 * Let MLD6 know that we have joined a new IP6 multicast
                    732:                 * group.
                    733:                 */
                    734:                mld_start_listening(in6m);
                    735:        }
                    736:        splx(s);
                    737:        return (in6m);
                    738: }
                    739:
                    740: /*
                    741:  * Delete a multicast address record.
                    742:  */
                    743: void
1.38      christos  744: in6_delmulti(struct in6_multi *in6m)
1.31      rpaulo    745: {
1.54      dyoung    746:        struct  sockaddr_in6 sin6;
1.31      rpaulo    747:        struct  in6_ifaddr *ia;
                    748:        int     s = splsoftnet();
                    749:
                    750:        mld_stoptimer(in6m);
                    751:
                    752:        if (--in6m->in6m_refcount == 0) {
1.73      ozaki-r   753:                int _s;
                    754:
1.31      rpaulo    755:                /*
                    756:                 * No remaining claims to this record; let MLD6 know
                    757:                 * that we are leaving the multicast group.
                    758:                 */
                    759:                mld_stop_listening(in6m);
                    760:
                    761:                /*
                    762:                 * Unlink from list.
                    763:                 */
                    764:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    765:                if (in6m->in6m_ia != NULL) {
1.60      rmind     766:                        ifafree(&in6m->in6m_ia->ia_ifa); /* release reference */
1.35      dyoung    767:                        in6m->in6m_ia = NULL;
1.31      rpaulo    768:                }
                    769:
                    770:                /*
                    771:                 * Delete all references of this multicasting group from
                    772:                 * the membership arrays
                    773:                 */
1.73      ozaki-r   774:                _s = pserialize_read_enter();
1.70      ozaki-r   775:                IN6_ADDRLIST_READER_FOREACH(ia) {
1.31      rpaulo    776:                        struct in6_multi_mship *imm;
1.35      dyoung    777:                        LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) {
1.31      rpaulo    778:                                if (imm->i6mm_maddr == in6m)
                    779:                                        imm->i6mm_maddr = NULL;
                    780:                        }
                    781:                }
1.73      ozaki-r   782:                pserialize_read_exit(_s);
1.31      rpaulo    783:
                    784:                /*
                    785:                 * Notify the network driver to update its multicast
                    786:                 * reception filter.
                    787:                 */
1.54      dyoung    788:                sockaddr_in6_init(&sin6, &in6m->in6m_addr, 0, 0, 0);
                    789:                if_mcast_op(in6m->in6m_ifp, SIOCDELMULTI, sin6tosa(&sin6));
1.61      ozaki-r   790:
                    791:                /* Tell mld_timeo we're halting the timer */
                    792:                in6m->in6m_timer = IN6M_TIMER_UNDEF;
1.75      knakahar  793: #ifdef NET_MPSAFE
                    794:                callout_halt(&in6m->in6m_timer_ch, NULL);
                    795: #else
1.61      ozaki-r   796:                callout_halt(&in6m->in6m_timer_ch, softnet_lock);
1.75      knakahar  797: #endif
1.41      joerg     798:                callout_destroy(&in6m->in6m_timer_ch);
1.61      ozaki-r   799:
1.31      rpaulo    800:                free(in6m, M_IPMADDR);
                    801:        }
                    802:        splx(s);
                    803: }
                    804:
                    805:
                    806: struct in6_multi_mship *
1.38      christos  807: in6_joingroup(struct ifnet *ifp, struct in6_addr *addr,
                    808:        int *errorp, int timer)
1.31      rpaulo    809: {
                    810:        struct in6_multi_mship *imm;
                    811:
1.51      dyoung    812:        imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT|M_ZERO);
                    813:        if (imm == NULL) {
1.31      rpaulo    814:                *errorp = ENOBUFS;
                    815:                return NULL;
                    816:        }
                    817:
1.32      rpaulo    818:        imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, timer);
1.31      rpaulo    819:        if (!imm->i6mm_maddr) {
1.36      dyoung    820:                /* *errorp is already set */
1.31      rpaulo    821:                free(imm, M_IPMADDR);
                    822:                return NULL;
                    823:        }
                    824:        return imm;
                    825: }
                    826:
                    827: int
1.38      christos  828: in6_leavegroup(struct in6_multi_mship *imm)
1.31      rpaulo    829: {
                    830:
                    831:        if (imm->i6mm_maddr) {
                    832:                in6_delmulti(imm->i6mm_maddr);
                    833:        }
                    834:        free(imm, M_IPMADDR);
                    835:        return 0;
                    836: }
                    837:
                    838:
                    839: /*
                    840:  * Multicast address kludge:
                    841:  * If there were any multicast addresses attached to this interface address,
                    842:  * either move them to another address on this interface, or save them until
                    843:  * such time as this interface is reconfigured for IPv6.
                    844:  */
                    845: void
1.38      christos  846: in6_savemkludge(struct in6_ifaddr *oia)
1.31      rpaulo    847: {
                    848:        struct in6_ifaddr *ia;
1.36      dyoung    849:        struct in6_multi *in6m;
1.74      ozaki-r   850:        int s;
1.31      rpaulo    851:
1.74      ozaki-r   852:        s = pserialize_read_enter();
1.72      ozaki-r   853:        ia = in6_get_ia_from_ifp(oia->ia_ifp);
1.31      rpaulo    854:        if (ia) {       /* there is another address */
1.36      dyoung    855:                KASSERT(ia != oia);
                    856:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    857:                        LIST_REMOVE(in6m, in6m_entry);
1.60      rmind     858:                        ifaref(&ia->ia_ifa);
                    859:                        ifafree(&in6m->in6m_ia->ia_ifa);
1.31      rpaulo    860:                        in6m->in6m_ia = ia;
1.74      ozaki-r   861:                        /* FIXME NOMPSAFE: need to lock */
1.31      rpaulo    862:                        LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    863:                }
                    864:        } else {        /* last address on this if deleted, save */
                    865:                struct multi6_kludge *mk;
                    866:
1.35      dyoung    867:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    868:                        if (mk->mk_ifp == oia->ia_ifp)
                    869:                                break;
                    870:                }
                    871:                if (mk == NULL) /* this should not happen! */
                    872:                        panic("in6_savemkludge: no kludge space");
                    873:
1.36      dyoung    874:                while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) {
                    875:                        LIST_REMOVE(in6m, in6m_entry);
1.60      rmind     876:                        ifafree(&in6m->in6m_ia->ia_ifa); /* release reference */
1.31      rpaulo    877:                        in6m->in6m_ia = NULL;
                    878:                        LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
                    879:                }
                    880:        }
1.74      ozaki-r   881:        pserialize_read_exit(s);
1.31      rpaulo    882: }
                    883:
                    884: /*
                    885:  * Continuation of multicast address hack:
                    886:  * If there was a multicast group list previously saved for this interface,
                    887:  * then we re-attach it to the first address configured on the i/f.
                    888:  */
                    889: void
1.38      christos  890: in6_restoremkludge(struct in6_ifaddr *ia, struct ifnet *ifp)
1.31      rpaulo    891: {
                    892:        struct multi6_kludge *mk;
1.36      dyoung    893:        struct in6_multi *in6m;
1.31      rpaulo    894:
1.35      dyoung    895:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    896:                if (mk->mk_ifp == ifp)
1.31      rpaulo    897:                        break;
                    898:        }
1.35      dyoung    899:        if (mk == NULL)
                    900:                return;
1.36      dyoung    901:        while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) {
                    902:                LIST_REMOVE(in6m, in6m_entry);
1.35      dyoung    903:                in6m->in6m_ia = ia;
1.60      rmind     904:                ifaref(&ia->ia_ifa);
1.35      dyoung    905:                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                    906:        }
1.31      rpaulo    907: }
                    908:
                    909: /*
                    910:  * Allocate space for the kludge at interface initialization time.
                    911:  * Formerly, we dynamically allocated the space in in6_savemkludge() with
                    912:  * malloc(M_WAITOK).  However, it was wrong since the function could be called
                    913:  * under an interrupt context (software timer on address lifetime expiration).
                    914:  * Also, we cannot just give up allocating the strucutre, since the group
                    915:  * membership structure is very complex and we need to keep it anyway.
                    916:  * Of course, this function MUST NOT be called under an interrupt context.
                    917:  * Specifically, it is expected to be called only from in6_ifattach(), though
                    918:  * it is a global function.
                    919:  */
                    920: void
1.38      christos  921: in6_createmkludge(struct ifnet *ifp)
1.31      rpaulo    922: {
                    923:        struct multi6_kludge *mk;
                    924:
1.35      dyoung    925:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
1.31      rpaulo    926:                /* If we've already had one, do not allocate. */
                    927:                if (mk->mk_ifp == ifp)
                    928:                        return;
                    929:        }
                    930:
1.51      dyoung    931:        mk = malloc(sizeof(*mk), M_IPMADDR, M_ZERO|M_WAITOK);
1.31      rpaulo    932:
                    933:        LIST_INIT(&mk->mk_head);
                    934:        mk->mk_ifp = ifp;
                    935:        LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
                    936: }
                    937:
                    938: void
1.38      christos  939: in6_purgemkludge(struct ifnet *ifp)
1.31      rpaulo    940: {
                    941:        struct multi6_kludge *mk;
1.36      dyoung    942:        struct in6_multi *in6m, *next;
1.31      rpaulo    943:
1.35      dyoung    944:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    945:                if (mk->mk_ifp == ifp)
                    946:                        break;
                    947:        }
                    948:        if (mk == NULL)
                    949:                return;
                    950:
                    951:        /* leave from all multicast groups joined */
1.36      dyoung    952:        for (in6m = LIST_FIRST(&mk->mk_head); in6m != NULL; in6m = next) {
                    953:                next = LIST_NEXT(in6m, in6m_entry);
1.35      dyoung    954:                in6_delmulti(in6m);
1.31      rpaulo    955:        }
1.35      dyoung    956:        LIST_REMOVE(mk, mk_entry);
                    957:        free(mk, M_IPMADDR);
1.31      rpaulo    958: }
1.57      joerg     959:
                    960: static int
                    961: in6_mkludge_sysctl(SYSCTLFN_ARGS)
                    962: {
                    963:        struct multi6_kludge *mk;
                    964:        struct in6_multi *in6m;
                    965:        int error;
                    966:        uint32_t tmp;
                    967:        size_t written;
                    968:
                    969:        if (namelen != 1)
                    970:                return EINVAL;
                    971:
                    972:        if (oldp == NULL) {
                    973:                *oldlenp = 0;
                    974:                LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    975:                        if (mk->mk_ifp->if_index == name[0])
                    976:                                continue;
                    977:                        LIST_FOREACH(in6m, &mk->mk_head, in6m_entry) {
                    978:                                *oldlenp += sizeof(struct in6_addr) +
                    979:                                    sizeof(uint32_t);
                    980:                        }
                    981:                }
                    982:                return 0;
                    983:        }
                    984:
                    985:        error = 0;
                    986:        written = 0;
                    987:        LIST_FOREACH(mk, &in6_mk, mk_entry) {
                    988:                if (mk->mk_ifp->if_index == name[0])
                    989:                        continue;
                    990:                LIST_FOREACH(in6m, &mk->mk_head, in6m_entry) {
                    991:                        if (written + sizeof(struct in6_addr) +
                    992:                            sizeof(uint32_t) > *oldlenp)
                    993:                                goto done;
                    994:                        error = sysctl_copyout(l, &in6m->in6m_addr,
                    995:                            oldp, sizeof(struct in6_addr));
                    996:                        if (error)
                    997:                                goto done;
                    998:                        oldp = (char *)oldp + sizeof(struct in6_addr);
                    999:                        written += sizeof(struct in6_addr);
                   1000:                        tmp = in6m->in6m_refcount;
                   1001:                        error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
                   1002:                        if (error)
                   1003:                                goto done;
                   1004:                        oldp = (char *)oldp + sizeof(tmp);
                   1005:                        written += sizeof(tmp);
                   1006:                }
                   1007:        }
                   1008:
                   1009: done:
                   1010:        *oldlenp = written;
                   1011:        return error;
                   1012: }
                   1013:
                   1014: static int
                   1015: in6_multicast_sysctl(SYSCTLFN_ARGS)
                   1016: {
                   1017:        struct ifnet *ifp;
                   1018:        struct ifaddr *ifa;
                   1019:        struct in6_ifaddr *ifa6;
                   1020:        struct in6_multi *in6m;
                   1021:        uint32_t tmp;
                   1022:        int error;
                   1023:        size_t written;
1.74      ozaki-r  1024:        struct psref psref, psref_ia;
                   1025:        int bound, s;
1.57      joerg    1026:
                   1027:        if (namelen != 1)
                   1028:                return EINVAL;
                   1029:
1.67      ozaki-r  1030:        bound = curlwp_bind();
                   1031:        ifp = if_get_byindex(name[0], &psref);
                   1032:        if (ifp == NULL) {
                   1033:                curlwp_bindx(bound);
1.57      joerg    1034:                return ENODEV;
1.67      ozaki-r  1035:        }
1.57      joerg    1036:
                   1037:        if (oldp == NULL) {
                   1038:                *oldlenp = 0;
1.74      ozaki-r  1039:                s = pserialize_read_enter();
1.71      ozaki-r  1040:                IFADDR_READER_FOREACH(ifa, ifp) {
1.57      joerg    1041:                        if (ifa->ifa_addr->sa_family != AF_INET6)
                   1042:                                continue;
                   1043:                        ifa6 = (struct in6_ifaddr *)ifa;
                   1044:                        LIST_FOREACH(in6m, &ifa6->ia6_multiaddrs, in6m_entry) {
                   1045:                                *oldlenp += 2 * sizeof(struct in6_addr) +
                   1046:                                    sizeof(uint32_t);
                   1047:                        }
                   1048:                }
1.74      ozaki-r  1049:                pserialize_read_exit(s);
1.67      ozaki-r  1050:                if_put(ifp, &psref);
                   1051:                curlwp_bindx(bound);
1.57      joerg    1052:                return 0;
                   1053:        }
                   1054:
                   1055:        error = 0;
                   1056:        written = 0;
1.74      ozaki-r  1057:        s = pserialize_read_enter();
1.71      ozaki-r  1058:        IFADDR_READER_FOREACH(ifa, ifp) {
1.57      joerg    1059:                if (ifa->ifa_addr->sa_family != AF_INET6)
                   1060:                        continue;
1.74      ozaki-r  1061:
                   1062:                ifa_acquire(ifa, &psref_ia);
                   1063:                pserialize_read_exit(s);
                   1064:
1.57      joerg    1065:                ifa6 = (struct in6_ifaddr *)ifa;
                   1066:                LIST_FOREACH(in6m, &ifa6->ia6_multiaddrs, in6m_entry) {
                   1067:                        if (written + 2 * sizeof(struct in6_addr) +
                   1068:                            sizeof(uint32_t) > *oldlenp)
                   1069:                                goto done;
                   1070:                        error = sysctl_copyout(l, &ifa6->ia_addr.sin6_addr,
                   1071:                            oldp, sizeof(struct in6_addr));
                   1072:                        if (error)
                   1073:                                goto done;
                   1074:                        oldp = (char *)oldp + sizeof(struct in6_addr);
                   1075:                        written += sizeof(struct in6_addr);
                   1076:                        error = sysctl_copyout(l, &in6m->in6m_addr,
                   1077:                            oldp, sizeof(struct in6_addr));
                   1078:                        if (error)
                   1079:                                goto done;
                   1080:                        oldp = (char *)oldp + sizeof(struct in6_addr);
                   1081:                        written += sizeof(struct in6_addr);
                   1082:                        tmp = in6m->in6m_refcount;
                   1083:                        error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
                   1084:                        if (error)
                   1085:                                goto done;
                   1086:                        oldp = (char *)oldp + sizeof(tmp);
                   1087:                        written += sizeof(tmp);
                   1088:                }
1.74      ozaki-r  1089:
                   1090:                s = pserialize_read_enter();
                   1091:                ifa_release(ifa, &psref_ia);
1.57      joerg    1092:        }
1.74      ozaki-r  1093:        pserialize_read_exit(s);
1.57      joerg    1094: done:
1.74      ozaki-r  1095:        ifa_release(ifa, &psref_ia);
1.67      ozaki-r  1096:        if_put(ifp, &psref);
                   1097:        curlwp_bindx(bound);
1.57      joerg    1098:        *oldlenp = written;
                   1099:        return error;
                   1100: }
                   1101:
1.76    ! ozaki-r  1102: void
        !          1103: in6_sysctl_multicast_setup(struct sysctllog **clog)
1.57      joerg    1104: {
                   1105:
                   1106:        sysctl_createv(clog, 0, NULL, NULL,
                   1107:                       CTLFLAG_PERMANENT,
1.59      joerg    1108:                       CTLTYPE_NODE, "inet6", NULL,
                   1109:                       NULL, 0, NULL, 0,
                   1110:                       CTL_NET, PF_INET6, CTL_EOL);
                   1111:
                   1112:        sysctl_createv(clog, 0, NULL, NULL,
                   1113:                       CTLFLAG_PERMANENT,
1.57      joerg    1114:                       CTLTYPE_NODE, "multicast",
                   1115:                       SYSCTL_DESCR("Multicast information"),
                   1116:                       in6_multicast_sysctl, 0, NULL, 0,
                   1117:                       CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL);
                   1118:
                   1119:        sysctl_createv(clog, 0, NULL, NULL,
                   1120:                       CTLFLAG_PERMANENT,
                   1121:                       CTLTYPE_NODE, "multicast_kludge",
                   1122:                       SYSCTL_DESCR("multicast kludge information"),
                   1123:                       in6_mkludge_sysctl, 0, NULL, 0,
                   1124:                       CTL_NET, PF_INET6, CTL_CREATE, CTL_EOL);
                   1125: }

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