1 /*- 2 * Copyright (C) 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: mld6.c,v 1.27 2001/04/04 05:17:30 itojun Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1988 Stephen Deering. 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. 48 * 4. 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 #include <sys/cdefs.h> 68 __FBSDID("$FreeBSD$"); 69 70 #include "opt_inet.h" 71 #include "opt_inet6.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/mbuf.h> 76 #include <sys/socket.h> 77 #include <sys/protosw.h> 78 #include <sys/syslog.h> 79 #include <sys/kernel.h> 80 #include <sys/callout.h> 81 #include <sys/malloc.h> 82 83 #include <net/if.h> 84 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet6/in6_var.h> 88 #include <netinet/ip6.h> 89 #include <netinet6/ip6_var.h> 90 #include <netinet6/scope6_var.h> 91 #include <netinet/icmp6.h> 92 #include <netinet6/mld6_var.h> 93 94 /* 95 * Protocol constants 96 */ 97 98 /* denotes that the MLD max response delay field specifies time in milliseconds */ 99 #define MLD_TIMER_SCALE 1000 100 /* 101 * time between repetitions of a node's initial report of interest in a 102 * multicast address(in seconds) 103 */ 104 #define MLD_UNSOLICITED_REPORT_INTERVAL 10 105 106 static struct ip6_pktopts ip6_opts; 107 108 static void mld6_sendpkt(struct in6_multi *, int, const struct in6_addr *); 109 static void mld_starttimer(struct in6_multi *); 110 static void mld_stoptimer(struct in6_multi *); 111 static void mld_timeo(struct in6_multi *); 112 static u_long mld_timerresid(struct in6_multi *); 113 114 void 115 mld6_init(void) 116 { 117 static u_int8_t hbh_buf[8]; 118 struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf; 119 u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD); 120 121 /* ip6h_nxt will be fill in later */ 122 hbh->ip6h_len = 0; /* (8 >> 3) - 1 */ 123 124 /* XXX: grotty hard coding... */ 125 hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */ 126 hbh_buf[3] = 0; 127 hbh_buf[4] = IP6OPT_ROUTER_ALERT; 128 hbh_buf[5] = IP6OPT_RTALERT_LEN - 2; 129 bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t)); 130 131 ip6_initpktopts(&ip6_opts); 132 ip6_opts.ip6po_hbh = hbh; 133 } 134 135 static void 136 mld_starttimer(struct in6_multi *in6m) 137 { 138 struct timeval now; 139 140 microtime(&now); 141 in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz; 142 in6m->in6m_timer_expire.tv_usec = now.tv_usec + 143 (in6m->in6m_timer % hz) * (1000000 / hz); 144 if (in6m->in6m_timer_expire.tv_usec > 1000000) { 145 in6m->in6m_timer_expire.tv_sec++; 146 in6m->in6m_timer_expire.tv_usec -= 1000000; 147 } 148 149 /* start or restart the timer */ 150 callout_reset(in6m->in6m_timer_ch, in6m->in6m_timer, 151 (void (*)(void *))mld_timeo, in6m); 152 } 153 154 static void 155 mld_stoptimer(struct in6_multi *in6m) 156 { 157 if (in6m->in6m_timer == IN6M_TIMER_UNDEF) 158 return; 159 160 callout_stop(in6m->in6m_timer_ch); 161 in6m->in6m_timer = IN6M_TIMER_UNDEF; 162 } 163 164 static void 165 mld_timeo(struct in6_multi *in6m) 166 { 167 int s = splnet(); 168 169 in6m->in6m_timer = IN6M_TIMER_UNDEF; 170 171 callout_stop(in6m->in6m_timer_ch); 172 173 switch (in6m->in6m_state) { 174 case MLD_REPORTPENDING: 175 mld6_start_listening(in6m); 176 break; 177 default: 178 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 179 break; 180 } 181 182 splx(s); 183 } 184 185 static u_long 186 mld_timerresid(struct in6_multi *in6m) 187 { 188 struct timeval now, diff; 189 190 microtime(&now); 191 192 if (now.tv_sec > in6m->in6m_timer_expire.tv_sec || 193 (now.tv_sec == in6m->in6m_timer_expire.tv_sec && 194 now.tv_usec > in6m->in6m_timer_expire.tv_usec)) { 195 return (0); 196 } 197 diff = in6m->in6m_timer_expire; 198 diff.tv_sec -= now.tv_sec; 199 diff.tv_usec -= now.tv_usec; 200 if (diff.tv_usec < 0) { 201 diff.tv_sec--; 202 diff.tv_usec += 1000000; 203 } 204 205 /* return the remaining time in milliseconds */ 206 return (((u_long)(diff.tv_sec * 1000000 + diff.tv_usec)) / 1000); 207 } 208 209 void 210 mld6_start_listening(struct in6_multi *in6m) 211 { 212 struct in6_addr all_in6; 213 int s = splnet(); 214 215 /* 216 * RFC2710 page 10: 217 * The node never sends a Report or Done for the link-scope all-nodes 218 * address. 219 * MLD messages are never sent for multicast addresses whose scope is 0 220 * (reserved) or 1 (node-local). 221 */ 222 all_in6 = in6addr_linklocal_allnodes; 223 if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) { 224 /* XXX: this should not happen! */ 225 in6m->in6m_timer = 0; 226 in6m->in6m_state = MLD_OTHERLISTENER; 227 } 228 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 229 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 230 IPV6_ADDR_SCOPE_LINKLOCAL) { 231 in6m->in6m_timer = 0; 232 in6m->in6m_state = MLD_OTHERLISTENER; 233 } else { 234 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 235 in6m->in6m_timer = arc4random() % 236 MLD_UNSOLICITED_REPORT_INTERVAL * hz; 237 in6m->in6m_state = MLD_IREPORTEDLAST; 238 239 mld_starttimer(in6m); 240 } 241 splx(s); 242 } 243 244 void 245 mld6_stop_listening(struct in6_multi *in6m) 246 { 247 struct in6_addr allnode, allrouter; 248 249 allnode = in6addr_linklocal_allnodes; 250 if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) { 251 /* XXX: this should not happen! */ 252 return; 253 } 254 allrouter = in6addr_linklocal_allrouters; 255 if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) { 256 /* XXX impossible */ 257 return; 258 } 259 if (in6m->in6m_state == MLD_IREPORTEDLAST && 260 !IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode) && 261 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > 262 IPV6_ADDR_SCOPE_INTFACELOCAL) { 263 mld6_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter); 264 } 265 } 266 267 void 268 mld6_input(struct mbuf *m, int off) 269 { 270 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 271 struct mld_hdr *mldh; 272 struct ifnet *ifp = m->m_pkthdr.rcvif; 273 struct in6_multi *in6m; 274 struct in6_addr mld_addr, all_in6; 275 struct in6_ifaddr *ia; 276 struct ifmultiaddr *ifma; 277 int timer; /* timer value in the MLD query header */ 278 279 #ifndef PULLDOWN_TEST 280 IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),); 281 mldh = (struct mld_hdr *)(mtod(m, caddr_t) + off); 282 #else 283 IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); 284 if (mldh == NULL) { 285 icmp6stat.icp6s_tooshort++; 286 return; 287 } 288 #endif 289 290 /* source address validation */ 291 ip6 = mtod(m, struct ip6_hdr *); /* in case mpullup */ 292 if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { 293 char ip6bufs[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 294 log(LOG_ERR, 295 "mld6_input: src %s is not link-local (grp=%s)\n", 296 ip6_sprintf(ip6bufs, &ip6->ip6_src), 297 ip6_sprintf(ip6bufg, &mldh->mld_addr)); 298 /* 299 * spec (RFC2710) does not explicitly 300 * specify to discard the packet from a non link-local 301 * source address. But we believe it's expected to do so. 302 * XXX: do we have to allow :: as source? 303 */ 304 m_freem(m); 305 return; 306 } 307 308 /* 309 * make a copy for local work (in6_setscope() may modify the 1st arg) 310 */ 311 mld_addr = mldh->mld_addr; 312 if (in6_setscope(&mld_addr, ifp, NULL)) { 313 /* XXX: this should not happen! */ 314 m_free(m); 315 return; 316 } 317 318 /* 319 * In the MLD6 specification, there are 3 states and a flag. 320 * 321 * In Non-Listener state, we simply don't have a membership record. 322 * In Delaying Listener state, our timer is running (in6m->in6m_timer) 323 * In Idle Listener state, our timer is not running 324 * (in6m->in6m_timer==IN6M_TIMER_UNDEF) 325 * 326 * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if 327 * we have heard a report from another member, or MLD_IREPORTEDLAST 328 * if we sent the last report. 329 */ 330 switch(mldh->mld_type) { 331 case MLD_LISTENER_QUERY: 332 if (ifp->if_flags & IFF_LOOPBACK) 333 break; 334 335 if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && 336 !IN6_IS_ADDR_MULTICAST(&mld_addr)) 337 break; /* print error or log stat? */ 338 339 all_in6 = in6addr_linklocal_allnodes; 340 if (in6_setscope(&all_in6, ifp, NULL)) { 341 /* XXX: this should not happen! */ 342 break; 343 } 344 345 /* 346 * - Start the timers in all of our membership records 347 * that the query applies to for the interface on 348 * which the query arrived excl. those that belong 349 * to the "all-nodes" group (ff02::1). 350 * - Restart any timer that is already running but has 351 * A value longer than the requested timeout. 352 * - Use the value specified in the query message as 353 * the maximum timeout. 354 */ 355 timer = ntohs(mldh->mld_maxdelay); 356 357 IFP_TO_IA6(ifp, ia); 358 if (ia == NULL) 359 break; 360 361 /* 362 * XXX: System timer resolution is too low to handle Max 363 * Response Delay, so set 1 to the internal timer even if 364 * the calculated value equals to zero when Max Response 365 * Delay is positive. 366 */ 367 timer = ntohs(mldh->mld_maxdelay) * PR_FASTHZ / MLD_TIMER_SCALE; 368 if (timer == 0 && mldh->mld_maxdelay) 369 timer = 1; 370 371 IF_ADDR_LOCK(ifp); 372 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 373 if (ifma->ifma_addr->sa_family != AF_INET6) 374 continue; 375 in6m = (struct in6_multi *)ifma->ifma_protospec; 376 377 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 378 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 379 IPV6_ADDR_SCOPE_LINKLOCAL) 380 continue; 381 382 if (IN6_IS_ADDR_UNSPECIFIED(&mld_addr) || 383 IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr)) { 384 if (timer == 0) { 385 /* send a report immediately */ 386 mld_stoptimer(in6m); 387 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, 388 NULL); 389 in6m->in6m_timer = 0; /* reset timer */ 390 in6m->in6m_state = MLD_IREPORTEDLAST; 391 } 392 else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || 393 mld_timerresid(in6m) > (u_long)timer) { 394 in6m->in6m_timer = arc4random() % 395 (int)((long)(timer * hz) / 1000); 396 mld_starttimer(in6m); 397 } 398 } 399 } 400 IF_ADDR_UNLOCK(ifp); 401 break; 402 403 case MLD_LISTENER_REPORT: 404 /* 405 * For fast leave to work, we have to know that we are the 406 * last person to send a report for this group. Reports 407 * can potentially get looped back if we are a multicast 408 * router, so discard reports sourced by me. 409 * Note that it is impossible to check IFF_LOOPBACK flag of 410 * ifp for this purpose, since ip6_mloopback pass the physical 411 * interface to looutput. 412 */ 413 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ 414 break; 415 416 if (!IN6_IS_ADDR_MULTICAST(&mld_addr)) 417 break; 418 419 /* 420 * If we belong to the group being reported, stop 421 * our timer for that group. 422 */ 423 IN6_LOOKUP_MULTI(mld_addr, ifp, in6m); 424 if (in6m) { 425 in6m->in6m_timer = 0; /* transit to idle state */ 426 in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ 427 } 428 break; 429 default: /* this is impossible */ 430 log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld_type); 431 break; 432 } 433 434 m_freem(m); 435 } 436 437 static void 438 mld6_sendpkt(struct in6_multi *in6m, int type, const struct in6_addr *dst) 439 { 440 struct mbuf *mh, *md; 441 struct mld_hdr *mldh; 442 struct ip6_hdr *ip6; 443 struct ip6_moptions im6o; 444 struct in6_ifaddr *ia; 445 struct ifnet *ifp = in6m->in6m_ifp; 446 struct ifnet *outif = NULL; 447 448 /* 449 * At first, find a link local address on the outgoing interface 450 * to use as the source address of the MLD packet. 451 */ 452 if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST)) 453 == NULL) 454 return; 455 456 /* 457 * Allocate mbufs to store ip6 header and MLD header. 458 * We allocate 2 mbufs and make chain in advance because 459 * it is more convenient when inserting the hop-by-hop option later. 460 */ 461 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 462 if (mh == NULL) 463 return; 464 MGET(md, M_DONTWAIT, MT_DATA); 465 if (md == NULL) { 466 m_free(mh); 467 return; 468 } 469 mh->m_next = md; 470 471 mh->m_pkthdr.rcvif = NULL; 472 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr); 473 mh->m_len = sizeof(struct ip6_hdr); 474 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 475 476 /* fill in the ip6 header */ 477 ip6 = mtod(mh, struct ip6_hdr *); 478 ip6->ip6_flow = 0; 479 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 480 ip6->ip6_vfc |= IPV6_VERSION; 481 /* ip6_plen will be set later */ 482 ip6->ip6_nxt = IPPROTO_ICMPV6; 483 /* ip6_hlim will be set by im6o.im6o_multicast_hlim */ 484 ip6->ip6_src = ia->ia_addr.sin6_addr; 485 ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; 486 487 /* fill in the MLD header */ 488 md->m_len = sizeof(struct mld_hdr); 489 mldh = mtod(md, struct mld_hdr *); 490 mldh->mld_type = type; 491 mldh->mld_code = 0; 492 mldh->mld_cksum = 0; 493 /* XXX: we assume the function will not be called for query messages */ 494 mldh->mld_maxdelay = 0; 495 mldh->mld_reserved = 0; 496 mldh->mld_addr = in6m->in6m_addr; 497 in6_clearscope(&mldh->mld_addr); /* XXX */ 498 mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), 499 sizeof(struct mld_hdr)); 500 501 /* construct multicast option */ 502 bzero(&im6o, sizeof(im6o)); 503 im6o.im6o_multicast_ifp = ifp; 504 im6o.im6o_multicast_hlim = 1; 505 506 /* 507 * Request loopback of the report if we are acting as a multicast 508 * router, so that the process-level routing daemon can hear it. 509 */ 510 im6o.im6o_multicast_loop = (ip6_mrouter != NULL); 511 512 /* increment output statictics */ 513 icmp6stat.icp6s_outhist[type]++; 514 515 ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif, NULL); 516 if (outif) { 517 icmp6_ifstat_inc(outif, ifs6_out_msg); 518 switch (type) { 519 case MLD_LISTENER_QUERY: 520 icmp6_ifstat_inc(outif, ifs6_out_mldquery); 521 break; 522 case MLD_LISTENER_REPORT: 523 icmp6_ifstat_inc(outif, ifs6_out_mldreport); 524 break; 525 case MLD_LISTENER_DONE: 526 icmp6_ifstat_inc(outif, ifs6_out_mlddone); 527 break; 528 } 529 } 530 } 531 532 /* 533 * Add an address to the list of IP6 multicast addresses for a given interface. 534 * Add source addresses to the list also, if upstream router is MLDv2 capable 535 * and the number of source is not 0. 536 */ 537 struct in6_multi * 538 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, 539 int *errorp, int delay) 540 { 541 struct in6_multi *in6m; 542 543 *errorp = 0; 544 in6m = NULL; 545 546 IFF_LOCKGIANT(ifp); 547 /*IN6_MULTI_LOCK();*/ 548 549 IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); 550 if (in6m != NULL) { 551 /* 552 * If we already joined this group, just bump the 553 * refcount and return it. 554 */ 555 KASSERT(in6m->in6m_refcount >= 1, 556 ("%s: bad refcount %d", __func__, in6m->in6m_refcount)); 557 ++in6m->in6m_refcount; 558 } else do { 559 struct in6_multi *nin6m; 560 struct ifmultiaddr *ifma; 561 struct sockaddr_in6 sa6; 562 563 bzero(&sa6, sizeof(sa6)); 564 sa6.sin6_family = AF_INET6; 565 sa6.sin6_len = sizeof(struct sockaddr_in6); 566 sa6.sin6_addr = *maddr6; 567 568 *errorp = if_addmulti(ifp, (struct sockaddr *)&sa6, &ifma); 569 if (*errorp) 570 break; 571 572 /* 573 * If ifma->ifma_protospec is null, then if_addmulti() created 574 * a new record. Otherwise, bump refcount, and we are done. 575 */ 576 if (ifma->ifma_protospec != NULL) { 577 in6m = ifma->ifma_protospec; 578 ++in6m->in6m_refcount; 579 break; 580 } 581 582 nin6m = malloc(sizeof(*nin6m), M_IP6MADDR, M_NOWAIT | M_ZERO); 583 if (nin6m == NULL) { 584 if_delmulti_ifma(ifma); 585 break; 586 } 587 588 nin6m->in6m_addr = *maddr6; 589 nin6m->in6m_ifp = ifp; 590 nin6m->in6m_refcount = 1; 591 nin6m->in6m_ifma = ifma; 592 ifma->ifma_protospec = nin6m; 593 594 nin6m->in6m_timer_ch = malloc(sizeof(*nin6m->in6m_timer_ch), 595 M_IP6MADDR, M_NOWAIT); 596 if (nin6m->in6m_timer_ch == NULL) { 597 free(nin6m, M_IP6MADDR); 598 if_delmulti_ifma(ifma); 599 break; 600 } 601 602 LIST_INSERT_HEAD(&in6_multihead, nin6m, in6m_entry); 603 604 callout_init(nin6m->in6m_timer_ch, 0); 605 nin6m->in6m_timer = delay; 606 if (nin6m->in6m_timer > 0) { 607 nin6m->in6m_state = MLD_REPORTPENDING; 608 mld_starttimer(nin6m); 609 } 610 611 mld6_start_listening(nin6m); 612 613 in6m = nin6m; 614 615 } while (0); 616 617 /*IN6_MULTI_UNLOCK();*/ 618 IFF_UNLOCKGIANT(ifp); 619 620 return (in6m); 621 } 622 623 /* 624 * Delete a multicast address record. 625 * 626 * TODO: Locking, as per netinet. 627 */ 628 void 629 in6_delmulti(struct in6_multi *in6m) 630 { 631 struct ifmultiaddr *ifma; 632 633 KASSERT(in6m->in6m_refcount >= 1, ("%s: freeing freed in6m", __func__)); 634 635 if (--in6m->in6m_refcount == 0) { 636 mld_stoptimer(in6m); 637 mld6_stop_listening(in6m); 638 639 ifma = in6m->in6m_ifma; 640 KASSERT(ifma->ifma_protospec == in6m, 641 ("%s: ifma_protospec != in6m", __func__)); 642 ifma->ifma_protospec = NULL; 643 644 LIST_REMOVE(in6m, in6m_entry); 645 free(in6m->in6m_timer_ch, M_IP6MADDR); 646 free(in6m, M_IP6MADDR); 647 648 if_delmulti_ifma(ifma); 649 } 650 } 651