Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/mld6.c
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1 /* $FreeBSD: releng/6.2/sys/netinet6/mld6.c 156569 2006-03-11 10:36:23Z suz $ */ 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 #include <net/net_osdep.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() 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(in6m) 137 struct in6_multi *in6m; 138 { 139 struct timeval now; 140 141 microtime(&now); 142 in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz; 143 in6m->in6m_timer_expire.tv_usec = now.tv_usec + 144 (in6m->in6m_timer % hz) * (1000000 / hz); 145 if (in6m->in6m_timer_expire.tv_usec > 1000000) { 146 in6m->in6m_timer_expire.tv_sec++; 147 in6m->in6m_timer_expire.tv_usec -= 1000000; 148 } 149 150 /* start or restart the timer */ 151 callout_reset(in6m->in6m_timer_ch, in6m->in6m_timer, 152 (void (*) __P((void *)))mld_timeo, in6m); 153 } 154 155 static void 156 mld_stoptimer(in6m) 157 struct in6_multi *in6m; 158 { 159 if (in6m->in6m_timer == IN6M_TIMER_UNDEF) 160 return; 161 162 callout_stop(in6m->in6m_timer_ch); 163 in6m->in6m_timer = IN6M_TIMER_UNDEF; 164 } 165 166 static void 167 mld_timeo(in6m) 168 struct in6_multi *in6m; 169 { 170 int s = splnet(); 171 172 in6m->in6m_timer = IN6M_TIMER_UNDEF; 173 174 callout_stop(in6m->in6m_timer_ch); 175 176 switch (in6m->in6m_state) { 177 case MLD_REPORTPENDING: 178 mld6_start_listening(in6m); 179 break; 180 default: 181 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 182 break; 183 } 184 185 splx(s); 186 } 187 188 static u_long 189 mld_timerresid(in6m) 190 struct in6_multi *in6m; 191 { 192 struct timeval now, diff; 193 194 microtime(&now); 195 196 if (now.tv_sec > in6m->in6m_timer_expire.tv_sec || 197 (now.tv_sec == in6m->in6m_timer_expire.tv_sec && 198 now.tv_usec > in6m->in6m_timer_expire.tv_usec)) { 199 return (0); 200 } 201 diff = in6m->in6m_timer_expire; 202 diff.tv_sec -= now.tv_sec; 203 diff.tv_usec -= now.tv_usec; 204 if (diff.tv_usec < 0) { 205 diff.tv_sec--; 206 diff.tv_usec += 1000000; 207 } 208 209 /* return the remaining time in milliseconds */ 210 return (((u_long)(diff.tv_sec * 1000000 + diff.tv_usec)) / 1000); 211 } 212 213 void 214 mld6_start_listening(in6m) 215 struct in6_multi *in6m; 216 { 217 struct in6_addr all_in6; 218 int s = splnet(); 219 220 /* 221 * RFC2710 page 10: 222 * The node never sends a Report or Done for the link-scope all-nodes 223 * address. 224 * MLD messages are never sent for multicast addresses whose scope is 0 225 * (reserved) or 1 (node-local). 226 */ 227 all_in6 = in6addr_linklocal_allnodes; 228 if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) { 229 /* XXX: this should not happen! */ 230 in6m->in6m_timer = 0; 231 in6m->in6m_state = MLD_OTHERLISTENER; 232 } 233 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 234 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 235 IPV6_ADDR_SCOPE_LINKLOCAL) { 236 in6m->in6m_timer = 0; 237 in6m->in6m_state = MLD_OTHERLISTENER; 238 } else { 239 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 240 in6m->in6m_timer = arc4random() % 241 MLD_UNSOLICITED_REPORT_INTERVAL * hz; 242 in6m->in6m_state = MLD_IREPORTEDLAST; 243 244 mld_starttimer(in6m); 245 } 246 splx(s); 247 } 248 249 void 250 mld6_stop_listening(in6m) 251 struct in6_multi *in6m; 252 { 253 struct in6_addr allnode, allrouter; 254 255 allnode = in6addr_linklocal_allnodes; 256 if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) { 257 /* XXX: this should not happen! */ 258 return; 259 } 260 allrouter = in6addr_linklocal_allrouters; 261 if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) { 262 /* XXX impossible */ 263 return; 264 } 265 if (in6m->in6m_state == MLD_IREPORTEDLAST && 266 !IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode) && 267 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > 268 IPV6_ADDR_SCOPE_INTFACELOCAL) { 269 mld6_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter); 270 } 271 } 272 273 void 274 mld6_input(m, off) 275 struct mbuf *m; 276 int off; 277 { 278 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 279 struct mld_hdr *mldh; 280 struct ifnet *ifp = m->m_pkthdr.rcvif; 281 struct in6_multi *in6m; 282 struct in6_addr mld_addr, all_in6; 283 struct in6_ifaddr *ia; 284 struct ifmultiaddr *ifma; 285 int timer; /* timer value in the MLD query header */ 286 287 #ifndef PULLDOWN_TEST 288 IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),); 289 mldh = (struct mld_hdr *)(mtod(m, caddr_t) + off); 290 #else 291 IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); 292 if (mldh == NULL) { 293 icmp6stat.icp6s_tooshort++; 294 return; 295 } 296 #endif 297 298 /* source address validation */ 299 ip6 = mtod(m, struct ip6_hdr *); /* in case mpullup */ 300 if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { 301 log(LOG_ERR, 302 "mld6_input: src %s is not link-local (grp=%s)\n", 303 ip6_sprintf(&ip6->ip6_src), 304 ip6_sprintf(&mldh->mld_addr)); 305 /* 306 * spec (RFC2710) does not explicitly 307 * specify to discard the packet from a non link-local 308 * source address. But we believe it's expected to do so. 309 * XXX: do we have to allow :: as source? 310 */ 311 m_freem(m); 312 return; 313 } 314 315 /* 316 * make a copy for local work (in6_setscope() may modify the 1st arg) 317 */ 318 mld_addr = mldh->mld_addr; 319 if (in6_setscope(&mld_addr, ifp, NULL)) { 320 /* XXX: this should not happen! */ 321 m_free(m); 322 return; 323 } 324 325 /* 326 * In the MLD6 specification, there are 3 states and a flag. 327 * 328 * In Non-Listener state, we simply don't have a membership record. 329 * In Delaying Listener state, our timer is running (in6m->in6m_timer) 330 * In Idle Listener state, our timer is not running 331 * (in6m->in6m_timer==IN6M_TIMER_UNDEF) 332 * 333 * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if 334 * we have heard a report from another member, or MLD_IREPORTEDLAST 335 * if we sent the last report. 336 */ 337 switch(mldh->mld_type) { 338 case MLD_LISTENER_QUERY: 339 if (ifp->if_flags & IFF_LOOPBACK) 340 break; 341 342 if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && 343 !IN6_IS_ADDR_MULTICAST(&mld_addr)) 344 break; /* print error or log stat? */ 345 346 all_in6 = in6addr_linklocal_allnodes; 347 if (in6_setscope(&all_in6, ifp, NULL)) { 348 /* XXX: this should not happen! */ 349 break; 350 } 351 352 /* 353 * - Start the timers in all of our membership records 354 * that the query applies to for the interface on 355 * which the query arrived excl. those that belong 356 * to the "all-nodes" group (ff02::1). 357 * - Restart any timer that is already running but has 358 * A value longer than the requested timeout. 359 * - Use the value specified in the query message as 360 * the maximum timeout. 361 */ 362 timer = ntohs(mldh->mld_maxdelay); 363 364 IFP_TO_IA6(ifp, ia); 365 if (ia == NULL) 366 break; 367 368 /* 369 * XXX: System timer resolution is too low to handle Max 370 * Response Delay, so set 1 to the internal timer even if 371 * the calculated value equals to zero when Max Response 372 * Delay is positive. 373 */ 374 timer = ntohs(mldh->mld_maxdelay) * PR_FASTHZ / MLD_TIMER_SCALE; 375 if (timer == 0 && mldh->mld_maxdelay) 376 timer = 1; 377 378 IF_ADDR_LOCK(ifp); 379 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 380 if (ifma->ifma_addr->sa_family != AF_INET6) 381 continue; 382 in6m = (struct in6_multi *)ifma->ifma_protospec; 383 384 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 385 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 386 IPV6_ADDR_SCOPE_LINKLOCAL) 387 continue; 388 389 if (IN6_IS_ADDR_UNSPECIFIED(&mld_addr) || 390 IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr)) { 391 if (timer == 0) { 392 /* send a report immediately */ 393 mld_stoptimer(in6m); 394 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, 395 NULL); 396 in6m->in6m_timer = 0; /* reset timer */ 397 in6m->in6m_state = MLD_IREPORTEDLAST; 398 } 399 else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || 400 mld_timerresid(in6m) > (u_long)timer) { 401 in6m->in6m_timer = arc4random() % 402 (int)((long)(timer * hz) / 1000); 403 mld_starttimer(in6m); 404 } 405 } 406 } 407 IF_ADDR_UNLOCK(ifp); 408 break; 409 410 case MLD_LISTENER_REPORT: 411 /* 412 * For fast leave to work, we have to know that we are the 413 * last person to send a report for this group. Reports 414 * can potentially get looped back if we are a multicast 415 * router, so discard reports sourced by me. 416 * Note that it is impossible to check IFF_LOOPBACK flag of 417 * ifp for this purpose, since ip6_mloopback pass the physical 418 * interface to looutput. 419 */ 420 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ 421 break; 422 423 if (!IN6_IS_ADDR_MULTICAST(&mld_addr)) 424 break; 425 426 /* 427 * If we belong to the group being reported, stop 428 * our timer for that group. 429 */ 430 IN6_LOOKUP_MULTI(mld_addr, ifp, in6m); 431 if (in6m) { 432 in6m->in6m_timer = 0; /* transit to idle state */ 433 in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ 434 } 435 break; 436 default: /* this is impossible */ 437 log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld_type); 438 break; 439 } 440 441 m_freem(m); 442 } 443 444 static void 445 mld6_sendpkt(in6m, type, dst) 446 struct in6_multi *in6m; 447 int type; 448 const struct in6_addr *dst; 449 { 450 struct mbuf *mh, *md; 451 struct mld_hdr *mldh; 452 struct ip6_hdr *ip6; 453 struct ip6_moptions im6o; 454 struct in6_ifaddr *ia; 455 struct ifnet *ifp = in6m->in6m_ifp; 456 struct ifnet *outif = NULL; 457 458 /* 459 * At first, find a link local address on the outgoing interface 460 * to use as the source address of the MLD packet. 461 */ 462 if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST)) 463 == NULL) 464 return; 465 466 /* 467 * Allocate mbufs to store ip6 header and MLD header. 468 * We allocate 2 mbufs and make chain in advance because 469 * it is more convenient when inserting the hop-by-hop option later. 470 */ 471 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 472 if (mh == NULL) 473 return; 474 MGET(md, M_DONTWAIT, MT_DATA); 475 if (md == NULL) { 476 m_free(mh); 477 return; 478 } 479 mh->m_next = md; 480 481 mh->m_pkthdr.rcvif = NULL; 482 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr); 483 mh->m_len = sizeof(struct ip6_hdr); 484 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 485 486 /* fill in the ip6 header */ 487 ip6 = mtod(mh, struct ip6_hdr *); 488 ip6->ip6_flow = 0; 489 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 490 ip6->ip6_vfc |= IPV6_VERSION; 491 /* ip6_plen will be set later */ 492 ip6->ip6_nxt = IPPROTO_ICMPV6; 493 /* ip6_hlim will be set by im6o.im6o_multicast_hlim */ 494 ip6->ip6_src = ia->ia_addr.sin6_addr; 495 ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; 496 497 /* fill in the MLD header */ 498 md->m_len = sizeof(struct mld_hdr); 499 mldh = mtod(md, struct mld_hdr *); 500 mldh->mld_type = type; 501 mldh->mld_code = 0; 502 mldh->mld_cksum = 0; 503 /* XXX: we assume the function will not be called for query messages */ 504 mldh->mld_maxdelay = 0; 505 mldh->mld_reserved = 0; 506 mldh->mld_addr = in6m->in6m_addr; 507 in6_clearscope(&mldh->mld_addr); /* XXX */ 508 mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), 509 sizeof(struct mld_hdr)); 510 511 /* construct multicast option */ 512 bzero(&im6o, sizeof(im6o)); 513 im6o.im6o_multicast_ifp = ifp; 514 im6o.im6o_multicast_hlim = 1; 515 516 /* 517 * Request loopback of the report if we are acting as a multicast 518 * router, so that the process-level routing daemon can hear it. 519 */ 520 im6o.im6o_multicast_loop = (ip6_mrouter != NULL); 521 522 /* increment output statictics */ 523 icmp6stat.icp6s_outhist[type]++; 524 525 ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif, NULL); 526 if (outif) { 527 icmp6_ifstat_inc(outif, ifs6_out_msg); 528 switch (type) { 529 case MLD_LISTENER_QUERY: 530 icmp6_ifstat_inc(outif, ifs6_out_mldquery); 531 break; 532 case MLD_LISTENER_REPORT: 533 icmp6_ifstat_inc(outif, ifs6_out_mldreport); 534 break; 535 case MLD_LISTENER_DONE: 536 icmp6_ifstat_inc(outif, ifs6_out_mlddone); 537 break; 538 } 539 } 540 } 541 542 /* 543 * Add an address to the list of IP6 multicast addresses for a given interface. 544 * Add source addresses to the list also, if upstream router is MLDv2 capable 545 * and the number of source is not 0. 546 */ 547 struct in6_multi * 548 in6_addmulti(maddr6, ifp, errorp, delay) 549 struct in6_addr *maddr6; 550 struct ifnet *ifp; 551 int *errorp, delay; 552 { 553 struct in6_multi *in6m; 554 struct ifmultiaddr *ifma; 555 struct sockaddr_in6 sa6; 556 int s = splnet(); 557 558 *errorp = 0; 559 560 /* 561 * Call generic routine to add membership or increment 562 * refcount. It wants addresses in the form of a sockaddr, 563 * so we build one here (being careful to zero the unused bytes). 564 */ 565 bzero(&sa6, sizeof(sa6)); 566 sa6.sin6_family = AF_INET6; 567 sa6.sin6_len = sizeof(struct sockaddr_in6); 568 sa6.sin6_addr = *maddr6; 569 *errorp = if_addmulti(ifp, (struct sockaddr *)&sa6, &ifma); 570 if (*errorp) { 571 splx(s); 572 return 0; 573 } 574 575 /* 576 * If ifma->ifma_protospec is null, then if_addmulti() created 577 * a new record. Otherwise, we are done. 578 */ 579 if (ifma->ifma_protospec != NULL) { 580 splx(s); 581 return ifma->ifma_protospec; 582 } 583 584 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 585 at interrupt time? If so, need to fix if_addmulti. XXX */ 586 in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IP6MADDR, M_NOWAIT); 587 if (in6m == NULL) { 588 splx(s); 589 return (NULL); 590 } 591 592 bzero(in6m, sizeof *in6m); 593 in6m->in6m_addr = *maddr6; 594 in6m->in6m_ifp = ifp; 595 in6m->in6m_refcount = 1; 596 in6m->in6m_ifma = ifma; 597 ifma->ifma_protospec = in6m; 598 in6m->in6m_timer_ch = malloc(sizeof(*in6m->in6m_timer_ch), M_IP6MADDR, 599 M_NOWAIT); 600 if (in6m->in6m_timer_ch == NULL) { 601 free(in6m, M_IP6MADDR); 602 splx(s); 603 return (NULL); 604 } 605 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 606 607 callout_init(in6m->in6m_timer_ch, 0); 608 in6m->in6m_timer = delay; 609 if (in6m->in6m_timer > 0) { 610 in6m->in6m_state = MLD_REPORTPENDING; 611 mld_starttimer(in6m); 612 613 splx(s); 614 return (in6m); 615 } 616 617 /* 618 * Let MLD6 know that we have joined a new IPv6 multicast 619 * group. 620 */ 621 mld6_start_listening(in6m); 622 splx(s); 623 return (in6m); 624 } 625 626 /* 627 * Delete a multicast address record. 628 */ 629 void 630 in6_delmulti(in6m) 631 struct in6_multi *in6m; 632 { 633 struct ifmultiaddr *ifma = in6m->in6m_ifma; 634 int s = splnet(); 635 636 if (ifma->ifma_refcount == 1) { 637 /* 638 * No remaining claims to this record; let MLD6 know 639 * that we are leaving the multicast group. 640 */ 641 mld_stoptimer(in6m); 642 mld6_stop_listening(in6m); 643 ifma->ifma_protospec = NULL; 644 LIST_REMOVE(in6m, in6m_entry); 645 free(in6m->in6m_timer_ch, M_IP6MADDR); 646 free(in6m, M_IP6MADDR); 647 } 648 /* XXX - should be separate API for when we have an ifma? */ 649 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 650 splx(s); 651 }
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