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 char ip6bufs[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 300 log(LOG_ERR, 301 "mld6_input: src %s is not link-local (grp=%s)\n", 302 ip6_sprintf(ip6bufs, &ip6->ip6_src), 303 ip6_sprintf(ip6bufg, &mldh->mld_addr)); 304 /* 305 * spec (RFC2710) does not explicitly 306 * specify to discard the packet from a non link-local 307 * source address. But we believe it's expected to do so. 308 * XXX: do we have to allow :: as source? 309 */ 310 m_freem(m); 311 return; 312 } 313 314 /* 315 * make a copy for local work (in6_setscope() may modify the 1st arg) 316 */ 317 mld_addr = mldh->mld_addr; 318 if (in6_setscope(&mld_addr, ifp, NULL)) { 319 /* XXX: this should not happen! */ 320 m_free(m); 321 return; 322 } 323 324 /* 325 * In the MLD6 specification, there are 3 states and a flag. 326 * 327 * In Non-Listener state, we simply don't have a membership record. 328 * In Delaying Listener state, our timer is running (in6m->in6m_timer) 329 * In Idle Listener state, our timer is not running 330 * (in6m->in6m_timer==IN6M_TIMER_UNDEF) 331 * 332 * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if 333 * we have heard a report from another member, or MLD_IREPORTEDLAST 334 * if we sent the last report. 335 */ 336 switch(mldh->mld_type) { 337 case MLD_LISTENER_QUERY: 338 if (ifp->if_flags & IFF_LOOPBACK) 339 break; 340 341 if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && 342 !IN6_IS_ADDR_MULTICAST(&mld_addr)) 343 break; /* print error or log stat? */ 344 345 all_in6 = in6addr_linklocal_allnodes; 346 if (in6_setscope(&all_in6, ifp, NULL)) { 347 /* XXX: this should not happen! */ 348 break; 349 } 350 351 /* 352 * - Start the timers in all of our membership records 353 * that the query applies to for the interface on 354 * which the query arrived excl. those that belong 355 * to the "all-nodes" group (ff02::1). 356 * - Restart any timer that is already running but has 357 * A value longer than the requested timeout. 358 * - Use the value specified in the query message as 359 * the maximum timeout. 360 */ 361 timer = ntohs(mldh->mld_maxdelay); 362 363 IFP_TO_IA6(ifp, ia); 364 if (ia == NULL) 365 break; 366 367 /* 368 * XXX: System timer resolution is too low to handle Max 369 * Response Delay, so set 1 to the internal timer even if 370 * the calculated value equals to zero when Max Response 371 * Delay is positive. 372 */ 373 timer = ntohs(mldh->mld_maxdelay) * PR_FASTHZ / MLD_TIMER_SCALE; 374 if (timer == 0 && mldh->mld_maxdelay) 375 timer = 1; 376 377 IF_ADDR_LOCK(ifp); 378 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 379 if (ifma->ifma_addr->sa_family != AF_INET6) 380 continue; 381 in6m = (struct in6_multi *)ifma->ifma_protospec; 382 383 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 384 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 385 IPV6_ADDR_SCOPE_LINKLOCAL) 386 continue; 387 388 if (IN6_IS_ADDR_UNSPECIFIED(&mld_addr) || 389 IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr)) { 390 if (timer == 0) { 391 /* send a report immediately */ 392 mld_stoptimer(in6m); 393 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, 394 NULL); 395 in6m->in6m_timer = 0; /* reset timer */ 396 in6m->in6m_state = MLD_IREPORTEDLAST; 397 } 398 else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || 399 mld_timerresid(in6m) > (u_long)timer) { 400 in6m->in6m_timer = arc4random() % 401 (int)((long)(timer * hz) / 1000); 402 mld_starttimer(in6m); 403 } 404 } 405 } 406 IF_ADDR_UNLOCK(ifp); 407 break; 408 409 case MLD_LISTENER_REPORT: 410 /* 411 * For fast leave to work, we have to know that we are the 412 * last person to send a report for this group. Reports 413 * can potentially get looped back if we are a multicast 414 * router, so discard reports sourced by me. 415 * Note that it is impossible to check IFF_LOOPBACK flag of 416 * ifp for this purpose, since ip6_mloopback pass the physical 417 * interface to looutput. 418 */ 419 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ 420 break; 421 422 if (!IN6_IS_ADDR_MULTICAST(&mld_addr)) 423 break; 424 425 /* 426 * If we belong to the group being reported, stop 427 * our timer for that group. 428 */ 429 IN6_LOOKUP_MULTI(mld_addr, ifp, in6m); 430 if (in6m) { 431 in6m->in6m_timer = 0; /* transit to idle state */ 432 in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ 433 } 434 break; 435 default: /* this is impossible */ 436 log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld_type); 437 break; 438 } 439 440 m_freem(m); 441 } 442 443 static void 444 mld6_sendpkt(in6m, type, dst) 445 struct in6_multi *in6m; 446 int type; 447 const struct in6_addr *dst; 448 { 449 struct mbuf *mh, *md; 450 struct mld_hdr *mldh; 451 struct ip6_hdr *ip6; 452 struct ip6_moptions im6o; 453 struct in6_ifaddr *ia; 454 struct ifnet *ifp = in6m->in6m_ifp; 455 struct ifnet *outif = NULL; 456 457 /* 458 * At first, find a link local address on the outgoing interface 459 * to use as the source address of the MLD packet. 460 */ 461 if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST)) 462 == NULL) 463 return; 464 465 /* 466 * Allocate mbufs to store ip6 header and MLD header. 467 * We allocate 2 mbufs and make chain in advance because 468 * it is more convenient when inserting the hop-by-hop option later. 469 */ 470 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 471 if (mh == NULL) 472 return; 473 MGET(md, M_DONTWAIT, MT_DATA); 474 if (md == NULL) { 475 m_free(mh); 476 return; 477 } 478 mh->m_next = md; 479 480 mh->m_pkthdr.rcvif = NULL; 481 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr); 482 mh->m_len = sizeof(struct ip6_hdr); 483 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 484 485 /* fill in the ip6 header */ 486 ip6 = mtod(mh, struct ip6_hdr *); 487 ip6->ip6_flow = 0; 488 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 489 ip6->ip6_vfc |= IPV6_VERSION; 490 /* ip6_plen will be set later */ 491 ip6->ip6_nxt = IPPROTO_ICMPV6; 492 /* ip6_hlim will be set by im6o.im6o_multicast_hlim */ 493 ip6->ip6_src = ia->ia_addr.sin6_addr; 494 ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; 495 496 /* fill in the MLD header */ 497 md->m_len = sizeof(struct mld_hdr); 498 mldh = mtod(md, struct mld_hdr *); 499 mldh->mld_type = type; 500 mldh->mld_code = 0; 501 mldh->mld_cksum = 0; 502 /* XXX: we assume the function will not be called for query messages */ 503 mldh->mld_maxdelay = 0; 504 mldh->mld_reserved = 0; 505 mldh->mld_addr = in6m->in6m_addr; 506 in6_clearscope(&mldh->mld_addr); /* XXX */ 507 mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), 508 sizeof(struct mld_hdr)); 509 510 /* construct multicast option */ 511 bzero(&im6o, sizeof(im6o)); 512 im6o.im6o_multicast_ifp = ifp; 513 im6o.im6o_multicast_hlim = 1; 514 515 /* 516 * Request loopback of the report if we are acting as a multicast 517 * router, so that the process-level routing daemon can hear it. 518 */ 519 im6o.im6o_multicast_loop = (ip6_mrouter != NULL); 520 521 /* increment output statictics */ 522 icmp6stat.icp6s_outhist[type]++; 523 524 ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif, NULL); 525 if (outif) { 526 icmp6_ifstat_inc(outif, ifs6_out_msg); 527 switch (type) { 528 case MLD_LISTENER_QUERY: 529 icmp6_ifstat_inc(outif, ifs6_out_mldquery); 530 break; 531 case MLD_LISTENER_REPORT: 532 icmp6_ifstat_inc(outif, ifs6_out_mldreport); 533 break; 534 case MLD_LISTENER_DONE: 535 icmp6_ifstat_inc(outif, ifs6_out_mlddone); 536 break; 537 } 538 } 539 } 540 541 /* 542 * Add an address to the list of IP6 multicast addresses for a given interface. 543 * Add source addresses to the list also, if upstream router is MLDv2 capable 544 * and the number of source is not 0. 545 */ 546 struct in6_multi * 547 in6_addmulti(maddr6, ifp, errorp, delay) 548 struct in6_addr *maddr6; 549 struct ifnet *ifp; 550 int *errorp, delay; 551 { 552 struct in6_multi *in6m; 553 struct ifmultiaddr *ifma; 554 struct sockaddr_in6 sa6; 555 int s = splnet(); 556 557 *errorp = 0; 558 559 /* 560 * Call generic routine to add membership or increment 561 * refcount. It wants addresses in the form of a sockaddr, 562 * so we build one here (being careful to zero the unused bytes). 563 */ 564 bzero(&sa6, sizeof(sa6)); 565 sa6.sin6_family = AF_INET6; 566 sa6.sin6_len = sizeof(struct sockaddr_in6); 567 sa6.sin6_addr = *maddr6; 568 *errorp = if_addmulti(ifp, (struct sockaddr *)&sa6, &ifma); 569 if (*errorp) { 570 splx(s); 571 return 0; 572 } 573 574 /* 575 * If ifma->ifma_protospec is null, then if_addmulti() created 576 * a new record. Otherwise, we are done. 577 */ 578 if (ifma->ifma_protospec != NULL) { 579 splx(s); 580 return ifma->ifma_protospec; 581 } 582 583 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 584 at interrupt time? If so, need to fix if_addmulti. XXX */ 585 in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IP6MADDR, M_NOWAIT); 586 if (in6m == NULL) { 587 splx(s); 588 return (NULL); 589 } 590 591 bzero(in6m, sizeof *in6m); 592 in6m->in6m_addr = *maddr6; 593 in6m->in6m_ifp = ifp; 594 in6m->in6m_refcount = 1; 595 in6m->in6m_ifma = ifma; 596 ifma->ifma_protospec = in6m; 597 in6m->in6m_timer_ch = malloc(sizeof(*in6m->in6m_timer_ch), M_IP6MADDR, 598 M_NOWAIT); 599 if (in6m->in6m_timer_ch == NULL) { 600 free(in6m, M_IP6MADDR); 601 splx(s); 602 return (NULL); 603 } 604 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 605 606 callout_init(in6m->in6m_timer_ch, 0); 607 in6m->in6m_timer = delay; 608 if (in6m->in6m_timer > 0) { 609 in6m->in6m_state = MLD_REPORTPENDING; 610 mld_starttimer(in6m); 611 612 splx(s); 613 return (in6m); 614 } 615 616 /* 617 * Let MLD6 know that we have joined a new IPv6 multicast 618 * group. 619 */ 620 mld6_start_listening(in6m); 621 splx(s); 622 return (in6m); 623 } 624 625 /* 626 * Delete a multicast address record. 627 */ 628 void 629 in6_delmulti(in6m) 630 struct in6_multi *in6m; 631 { 632 struct ifmultiaddr *ifma = in6m->in6m_ifma; 633 int s = splnet(); 634 635 if (ifma->ifma_refcount == 1) { 636 /* 637 * No remaining claims to this record; let MLD6 know 638 * that we are leaving the multicast group. 639 */ 640 mld_stoptimer(in6m); 641 mld6_stop_listening(in6m); 642 ifma->ifma_protospec = NULL; 643 LIST_REMOVE(in6m, in6m_entry); 644 free(in6m->in6m_timer_ch, M_IP6MADDR); 645 free(in6m, M_IP6MADDR); 646 } 647 /* XXX - should be separate API for when we have an ifma? */ 648 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 649 splx(s); 650 } 651