1 /* $FreeBSD$ */ 2 /* $KAME: mld6.c,v 1.27 2001/04/04 05:17:30 itojun Exp $ */ 3 4 /*- 5 * Copyright (C) 1998 WIDE Project. 6 * All rights reserved. 7 * 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. 19 * 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) 1988 Stephen Deering. 35 * Copyright (c) 1992, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * This code is derived from software contributed to Berkeley by 39 * Stephen Deering of Stanford University. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)igmp.c 8.1 (Berkeley) 7/19/93 66 */ 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/mbuf.h> 74 #include <sys/socket.h> 75 #include <sys/protosw.h> 76 #include <sys/syslog.h> 77 #include <sys/kernel.h> 78 #include <sys/callout.h> 79 #include <sys/malloc.h> 80 81 #include <net/if.h> 82 83 #include <netinet/in.h> 84 #include <netinet/in_var.h> 85 #include <netinet6/in6_var.h> 86 #include <netinet/ip6.h> 87 #include <netinet6/ip6_var.h> 88 #include <netinet6/scope6_var.h> 89 #include <netinet/icmp6.h> 90 #include <netinet6/mld6_var.h> 91 92 /* 93 * Protocol constants 94 */ 95 96 /* denotes that the MLD max response delay field specifies time in milliseconds */ 97 #define MLD_TIMER_SCALE 1000 98 /* 99 * time between repetitions of a node's initial report of interest in a 100 * multicast address(in seconds) 101 */ 102 #define MLD_UNSOLICITED_REPORT_INTERVAL 10 103 104 static struct ip6_pktopts ip6_opts; 105 106 static void mld6_sendpkt(struct in6_multi *, int, const struct in6_addr *); 107 static void mld_starttimer(struct in6_multi *); 108 static void mld_stoptimer(struct in6_multi *); 109 static void mld_timeo(struct in6_multi *); 110 static u_long mld_timerresid(struct in6_multi *); 111 112 void 113 mld6_init() 114 { 115 static u_int8_t hbh_buf[8]; 116 struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf; 117 u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD); 118 119 /* ip6h_nxt will be fill in later */ 120 hbh->ip6h_len = 0; /* (8 >> 3) - 1 */ 121 122 /* XXX: grotty hard coding... */ 123 hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */ 124 hbh_buf[3] = 0; 125 hbh_buf[4] = IP6OPT_ROUTER_ALERT; 126 hbh_buf[5] = IP6OPT_RTALERT_LEN - 2; 127 bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t)); 128 129 ip6_initpktopts(&ip6_opts); 130 ip6_opts.ip6po_hbh = hbh; 131 } 132 133 static void 134 mld_starttimer(in6m) 135 struct in6_multi *in6m; 136 { 137 struct timeval now; 138 139 microtime(&now); 140 in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz; 141 in6m->in6m_timer_expire.tv_usec = now.tv_usec + 142 (in6m->in6m_timer % hz) * (1000000 / hz); 143 if (in6m->in6m_timer_expire.tv_usec > 1000000) { 144 in6m->in6m_timer_expire.tv_sec++; 145 in6m->in6m_timer_expire.tv_usec -= 1000000; 146 } 147 148 /* start or restart the timer */ 149 callout_reset(in6m->in6m_timer_ch, in6m->in6m_timer, 150 (void (*) __P((void *)))mld_timeo, in6m); 151 } 152 153 static void 154 mld_stoptimer(in6m) 155 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(in6m) 166 struct in6_multi *in6m; 167 { 168 int s = splnet(); 169 170 in6m->in6m_timer = IN6M_TIMER_UNDEF; 171 172 callout_stop(in6m->in6m_timer_ch); 173 174 switch (in6m->in6m_state) { 175 case MLD_REPORTPENDING: 176 mld6_start_listening(in6m); 177 break; 178 default: 179 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 180 break; 181 } 182 183 splx(s); 184 } 185 186 static u_long 187 mld_timerresid(in6m) 188 struct in6_multi *in6m; 189 { 190 struct timeval now, diff; 191 192 microtime(&now); 193 194 if (now.tv_sec > in6m->in6m_timer_expire.tv_sec || 195 (now.tv_sec == in6m->in6m_timer_expire.tv_sec && 196 now.tv_usec > in6m->in6m_timer_expire.tv_usec)) { 197 return (0); 198 } 199 diff = in6m->in6m_timer_expire; 200 diff.tv_sec -= now.tv_sec; 201 diff.tv_usec -= now.tv_usec; 202 if (diff.tv_usec < 0) { 203 diff.tv_sec--; 204 diff.tv_usec += 1000000; 205 } 206 207 /* return the remaining time in milliseconds */ 208 return (((u_long)(diff.tv_sec * 1000000 + diff.tv_usec)) / 1000); 209 } 210 211 void 212 mld6_start_listening(in6m) 213 struct in6_multi *in6m; 214 { 215 struct in6_addr all_in6; 216 int s = splnet(); 217 218 /* 219 * RFC2710 page 10: 220 * The node never sends a Report or Done for the link-scope all-nodes 221 * address. 222 * MLD messages are never sent for multicast addresses whose scope is 0 223 * (reserved) or 1 (node-local). 224 */ 225 all_in6 = in6addr_linklocal_allnodes; 226 if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) { 227 /* XXX: this should not happen! */ 228 in6m->in6m_timer = 0; 229 in6m->in6m_state = MLD_OTHERLISTENER; 230 } 231 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 232 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 233 IPV6_ADDR_SCOPE_LINKLOCAL) { 234 in6m->in6m_timer = 0; 235 in6m->in6m_state = MLD_OTHERLISTENER; 236 } else { 237 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 238 in6m->in6m_timer = arc4random() % 239 MLD_UNSOLICITED_REPORT_INTERVAL * hz; 240 in6m->in6m_state = MLD_IREPORTEDLAST; 241 242 mld_starttimer(in6m); 243 } 244 splx(s); 245 } 246 247 void 248 mld6_stop_listening(in6m) 249 struct in6_multi *in6m; 250 { 251 struct in6_addr allnode, allrouter; 252 253 allnode = in6addr_linklocal_allnodes; 254 if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) { 255 /* XXX: this should not happen! */ 256 return; 257 } 258 allrouter = in6addr_linklocal_allrouters; 259 if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) { 260 /* XXX impossible */ 261 return; 262 } 263 if (in6m->in6m_state == MLD_IREPORTEDLAST && 264 !IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode) && 265 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > 266 IPV6_ADDR_SCOPE_INTFACELOCAL) { 267 mld6_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter); 268 } 269 } 270 271 void 272 mld6_input(m, off) 273 struct mbuf *m; 274 int off; 275 { 276 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 277 struct mld_hdr *mldh; 278 struct ifnet *ifp = m->m_pkthdr.rcvif; 279 struct in6_multi *in6m; 280 struct in6_addr mld_addr, all_in6; 281 struct in6_ifaddr *ia; 282 struct ifmultiaddr *ifma; 283 int timer; /* timer value in the MLD query header */ 284 285 #ifndef PULLDOWN_TEST 286 IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),); 287 mldh = (struct mld_hdr *)(mtod(m, caddr_t) + off); 288 #else 289 IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); 290 if (mldh == NULL) { 291 icmp6stat.icp6s_tooshort++; 292 return; 293 } 294 #endif 295 296 /* source address validation */ 297 ip6 = mtod(m, struct ip6_hdr *); /* in case mpullup */ 298 if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { 299 log(LOG_ERR, 300 "mld6_input: src %s is not link-local (grp=%s)\n", 301 ip6_sprintf(&ip6->ip6_src), 302 ip6_sprintf(&mldh->mld_addr)); 303 /* 304 * spec (RFC2710) does not explicitly 305 * specify to discard the packet from a non link-local 306 * source address. But we believe it's expected to do so. 307 * XXX: do we have to allow :: as source? 308 */ 309 m_freem(m); 310 return; 311 } 312 313 /* 314 * make a copy for local work (in6_setscope() may modify the 1st arg) 315 */ 316 mld_addr = mldh->mld_addr; 317 if (in6_setscope(&mld_addr, ifp, NULL)) { 318 /* XXX: this should not happen! */ 319 m_free(m); 320 return; 321 } 322 323 /* 324 * In the MLD6 specification, there are 3 states and a flag. 325 * 326 * In Non-Listener state, we simply don't have a membership record. 327 * In Delaying Listener state, our timer is running (in6m->in6m_timer) 328 * In Idle Listener state, our timer is not running 329 * (in6m->in6m_timer==IN6M_TIMER_UNDEF) 330 * 331 * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if 332 * we have heard a report from another member, or MLD_IREPORTEDLAST 333 * if we sent the last report. 334 */ 335 switch(mldh->mld_type) { 336 case MLD_LISTENER_QUERY: 337 if (ifp->if_flags & IFF_LOOPBACK) 338 break; 339 340 if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && 341 !IN6_IS_ADDR_MULTICAST(&mld_addr)) 342 break; /* print error or log stat? */ 343 344 all_in6 = in6addr_linklocal_allnodes; 345 if (in6_setscope(&all_in6, ifp, NULL)) { 346 /* XXX: this should not happen! */ 347 break; 348 } 349 350 /* 351 * - Start the timers in all of our membership records 352 * that the query applies to for the interface on 353 * which the query arrived excl. those that belong 354 * to the "all-nodes" group (ff02::1). 355 * - Restart any timer that is already running but has 356 * A value longer than the requested timeout. 357 * - Use the value specified in the query message as 358 * the maximum timeout. 359 */ 360 timer = ntohs(mldh->mld_maxdelay); 361 362 IFP_TO_IA6(ifp, ia); 363 if (ia == NULL) 364 break; 365 366 /* 367 * XXX: System timer resolution is too low to handle Max 368 * Response Delay, so set 1 to the internal timer even if 369 * the calculated value equals to zero when Max Response 370 * Delay is positive. 371 */ 372 timer = ntohs(mldh->mld_maxdelay) * PR_FASTHZ / MLD_TIMER_SCALE; 373 if (timer == 0 && mldh->mld_maxdelay) 374 timer = 1; 375 376 IF_ADDR_LOCK(ifp); 377 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 378 if (ifma->ifma_addr->sa_family != AF_INET6) 379 continue; 380 in6m = (struct in6_multi *)ifma->ifma_protospec; 381 382 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 383 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 384 IPV6_ADDR_SCOPE_LINKLOCAL) 385 continue; 386 387 if (IN6_IS_ADDR_UNSPECIFIED(&mld_addr) || 388 IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr)) { 389 if (timer == 0) { 390 /* send a report immediately */ 391 mld_stoptimer(in6m); 392 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, 393 NULL); 394 in6m->in6m_timer = 0; /* reset timer */ 395 in6m->in6m_state = MLD_IREPORTEDLAST; 396 } 397 else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || 398 mld_timerresid(in6m) > (u_long)timer) { 399 in6m->in6m_timer = arc4random() % 400 (int)((long)(timer * hz) / 1000); 401 mld_starttimer(in6m); 402 } 403 } 404 } 405 IF_ADDR_UNLOCK(ifp); 406 break; 407 408 case MLD_LISTENER_REPORT: 409 /* 410 * For fast leave to work, we have to know that we are the 411 * last person to send a report for this group. Reports 412 * can potentially get looped back if we are a multicast 413 * router, so discard reports sourced by me. 414 * Note that it is impossible to check IFF_LOOPBACK flag of 415 * ifp for this purpose, since ip6_mloopback pass the physical 416 * interface to looutput. 417 */ 418 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ 419 break; 420 421 if (!IN6_IS_ADDR_MULTICAST(&mld_addr)) 422 break; 423 424 /* 425 * If we belong to the group being reported, stop 426 * our timer for that group. 427 */ 428 IN6_LOOKUP_MULTI(mld_addr, ifp, in6m); 429 if (in6m) { 430 in6m->in6m_timer = 0; /* transit to idle state */ 431 in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ 432 } 433 break; 434 default: /* this is impossible */ 435 log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld_type); 436 break; 437 } 438 439 m_freem(m); 440 } 441 442 static void 443 mld6_sendpkt(in6m, type, dst) 444 struct in6_multi *in6m; 445 int type; 446 const struct in6_addr *dst; 447 { 448 struct mbuf *mh, *md; 449 struct mld_hdr *mldh; 450 struct ip6_hdr *ip6; 451 struct ip6_moptions im6o; 452 struct in6_ifaddr *ia; 453 struct ifnet *ifp = in6m->in6m_ifp; 454 struct ifnet *outif = NULL; 455 456 /* 457 * At first, find a link local address on the outgoing interface 458 * to use as the source address of the MLD packet. 459 */ 460 if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST)) 461 == NULL) 462 return; 463 464 /* 465 * Allocate mbufs to store ip6 header and MLD header. 466 * We allocate 2 mbufs and make chain in advance because 467 * it is more convenient when inserting the hop-by-hop option later. 468 */ 469 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 470 if (mh == NULL) 471 return; 472 MGET(md, M_DONTWAIT, MT_DATA); 473 if (md == NULL) { 474 m_free(mh); 475 return; 476 } 477 mh->m_next = md; 478 479 mh->m_pkthdr.rcvif = NULL; 480 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr); 481 mh->m_len = sizeof(struct ip6_hdr); 482 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 483 484 /* fill in the ip6 header */ 485 ip6 = mtod(mh, struct ip6_hdr *); 486 ip6->ip6_flow = 0; 487 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 488 ip6->ip6_vfc |= IPV6_VERSION; 489 /* ip6_plen will be set later */ 490 ip6->ip6_nxt = IPPROTO_ICMPV6; 491 /* ip6_hlim will be set by im6o.im6o_multicast_hlim */ 492 ip6->ip6_src = ia->ia_addr.sin6_addr; 493 ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; 494 495 /* fill in the MLD header */ 496 md->m_len = sizeof(struct mld_hdr); 497 mldh = mtod(md, struct mld_hdr *); 498 mldh->mld_type = type; 499 mldh->mld_code = 0; 500 mldh->mld_cksum = 0; 501 /* XXX: we assume the function will not be called for query messages */ 502 mldh->mld_maxdelay = 0; 503 mldh->mld_reserved = 0; 504 mldh->mld_addr = in6m->in6m_addr; 505 in6_clearscope(&mldh->mld_addr); /* XXX */ 506 mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), 507 sizeof(struct mld_hdr)); 508 509 /* construct multicast option */ 510 bzero(&im6o, sizeof(im6o)); 511 im6o.im6o_multicast_ifp = ifp; 512 im6o.im6o_multicast_hlim = 1; 513 514 /* 515 * Request loopback of the report if we are acting as a multicast 516 * router, so that the process-level routing daemon can hear it. 517 */ 518 im6o.im6o_multicast_loop = (ip6_mrouter != NULL); 519 520 /* increment output statictics */ 521 icmp6stat.icp6s_outhist[type]++; 522 523 ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif, NULL); 524 if (outif) { 525 icmp6_ifstat_inc(outif, ifs6_out_msg); 526 switch (type) { 527 case MLD_LISTENER_QUERY: 528 icmp6_ifstat_inc(outif, ifs6_out_mldquery); 529 break; 530 case MLD_LISTENER_REPORT: 531 icmp6_ifstat_inc(outif, ifs6_out_mldreport); 532 break; 533 case MLD_LISTENER_DONE: 534 icmp6_ifstat_inc(outif, ifs6_out_mlddone); 535 break; 536 } 537 } 538 } 539 540 /* 541 * Add an address to the list of IP6 multicast addresses for a given interface. 542 * Add source addresses to the list also, if upstream router is MLDv2 capable 543 * and the number of source is not 0. 544 */ 545 struct in6_multi * 546 in6_addmulti(maddr6, ifp, errorp, delay) 547 struct in6_addr *maddr6; 548 struct ifnet *ifp; 549 int *errorp, delay; 550 { 551 struct in6_multi *in6m; 552 struct ifmultiaddr *ifma; 553 struct sockaddr_in6 sa6; 554 int s = splnet(); 555 556 *errorp = 0; 557 558 /* 559 * Call generic routine to add membership or increment 560 * refcount. It wants addresses in the form of a sockaddr, 561 * so we build one here (being careful to zero the unused bytes). 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 *errorp = if_addmulti(ifp, (struct sockaddr *)&sa6, &ifma); 568 if (*errorp) { 569 splx(s); 570 return 0; 571 } 572 573 /* 574 * If ifma->ifma_protospec is null, then if_addmulti() created 575 * a new record. Otherwise, we are done. 576 */ 577 if (ifma->ifma_protospec != NULL) { 578 splx(s); 579 return ifma->ifma_protospec; 580 } 581 582 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 583 at interrupt time? If so, need to fix if_addmulti. XXX */ 584 in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IP6MADDR, M_NOWAIT); 585 if (in6m == NULL) { 586 splx(s); 587 return (NULL); 588 } 589 590 bzero(in6m, sizeof *in6m); 591 in6m->in6m_addr = *maddr6; 592 in6m->in6m_ifp = ifp; 593 in6m->in6m_refcount = 1; 594 in6m->in6m_ifma = ifma; 595 ifma->ifma_protospec = in6m; 596 in6m->in6m_timer_ch = malloc(sizeof(*in6m->in6m_timer_ch), M_IP6MADDR, 597 M_NOWAIT); 598 if (in6m->in6m_timer_ch == NULL) { 599 free(in6m, M_IP6MADDR); 600 splx(s); 601 return (NULL); 602 } 603 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 604 605 callout_init(in6m->in6m_timer_ch, 0); 606 in6m->in6m_timer = delay; 607 if (in6m->in6m_timer > 0) { 608 in6m->in6m_state = MLD_REPORTPENDING; 609 mld_starttimer(in6m); 610 611 splx(s); 612 return (in6m); 613 } 614 615 /* 616 * Let MLD6 know that we have joined a new IPv6 multicast 617 * group. 618 */ 619 mld6_start_listening(in6m); 620 splx(s); 621 return (in6m); 622 } 623 624 /* 625 * Delete a multicast address record. 626 */ 627 void 628 in6_delmulti(in6m) 629 struct in6_multi *in6m; 630 { 631 struct ifmultiaddr *ifma = in6m->in6m_ifma; 632 int s = splnet(); 633 634 if (ifma->ifma_refcount == 1) { 635 /* 636 * No remaining claims to this record; let MLD6 know 637 * that we are leaving the multicast group. 638 */ 639 mld_stoptimer(in6m); 640 mld6_stop_listening(in6m); 641 ifma->ifma_protospec = NULL; 642 LIST_REMOVE(in6m, in6m_entry); 643 free(in6m->in6m_timer_ch, M_IP6MADDR); 644 free(in6m, M_IP6MADDR); 645 } 646 /* XXX - should be separate API for when we have an ifma? */ 647 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 648 splx(s); 649 } 650