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 /* $FreeBSD$ */ 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(void) 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(struct in6_multi *in6m) 135 { 136 struct timeval now; 137 138 microtime(&now); 139 in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz; 140 in6m->in6m_timer_expire.tv_usec = now.tv_usec + 141 (in6m->in6m_timer % hz) * (1000000 / hz); 142 if (in6m->in6m_timer_expire.tv_usec > 1000000) { 143 in6m->in6m_timer_expire.tv_sec++; 144 in6m->in6m_timer_expire.tv_usec -= 1000000; 145 } 146 147 /* start or restart the timer */ 148 callout_reset(in6m->in6m_timer_ch, in6m->in6m_timer, 149 (void (*) __P((void *)))mld_timeo, in6m); 150 } 151 152 static void 153 mld_stoptimer(struct in6_multi *in6m) 154 { 155 if (in6m->in6m_timer == IN6M_TIMER_UNDEF) 156 return; 157 158 callout_stop(in6m->in6m_timer_ch); 159 in6m->in6m_timer = IN6M_TIMER_UNDEF; 160 } 161 162 static void 163 mld_timeo(struct in6_multi *in6m) 164 { 165 int s = splnet(); 166 167 in6m->in6m_timer = IN6M_TIMER_UNDEF; 168 169 callout_stop(in6m->in6m_timer_ch); 170 171 switch (in6m->in6m_state) { 172 case MLD_REPORTPENDING: 173 mld6_start_listening(in6m); 174 break; 175 default: 176 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 177 break; 178 } 179 180 splx(s); 181 } 182 183 static u_long 184 mld_timerresid(struct in6_multi *in6m) 185 { 186 struct timeval now, diff; 187 188 microtime(&now); 189 190 if (now.tv_sec > in6m->in6m_timer_expire.tv_sec || 191 (now.tv_sec == in6m->in6m_timer_expire.tv_sec && 192 now.tv_usec > in6m->in6m_timer_expire.tv_usec)) { 193 return (0); 194 } 195 diff = in6m->in6m_timer_expire; 196 diff.tv_sec -= now.tv_sec; 197 diff.tv_usec -= now.tv_usec; 198 if (diff.tv_usec < 0) { 199 diff.tv_sec--; 200 diff.tv_usec += 1000000; 201 } 202 203 /* return the remaining time in milliseconds */ 204 return (((u_long)(diff.tv_sec * 1000000 + diff.tv_usec)) / 1000); 205 } 206 207 void 208 mld6_start_listening(struct in6_multi *in6m) 209 { 210 struct in6_addr all_in6; 211 int s = splnet(); 212 213 /* 214 * RFC2710 page 10: 215 * The node never sends a Report or Done for the link-scope all-nodes 216 * address. 217 * MLD messages are never sent for multicast addresses whose scope is 0 218 * (reserved) or 1 (node-local). 219 */ 220 all_in6 = in6addr_linklocal_allnodes; 221 if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) { 222 /* XXX: this should not happen! */ 223 in6m->in6m_timer = 0; 224 in6m->in6m_state = MLD_OTHERLISTENER; 225 } 226 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 227 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 228 IPV6_ADDR_SCOPE_LINKLOCAL) { 229 in6m->in6m_timer = 0; 230 in6m->in6m_state = MLD_OTHERLISTENER; 231 } else { 232 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 233 in6m->in6m_timer = arc4random() % 234 MLD_UNSOLICITED_REPORT_INTERVAL * hz; 235 in6m->in6m_state = MLD_IREPORTEDLAST; 236 237 mld_starttimer(in6m); 238 } 239 splx(s); 240 } 241 242 void 243 mld6_stop_listening(struct in6_multi *in6m) 244 { 245 struct in6_addr allnode, allrouter; 246 247 allnode = in6addr_linklocal_allnodes; 248 if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) { 249 /* XXX: this should not happen! */ 250 return; 251 } 252 allrouter = in6addr_linklocal_allrouters; 253 if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) { 254 /* XXX impossible */ 255 return; 256 } 257 if (in6m->in6m_state == MLD_IREPORTEDLAST && 258 !IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode) && 259 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > 260 IPV6_ADDR_SCOPE_INTFACELOCAL) { 261 mld6_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter); 262 } 263 } 264 265 void 266 mld6_input(struct mbuf *m, int off) 267 { 268 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 269 struct mld_hdr *mldh; 270 struct ifnet *ifp = m->m_pkthdr.rcvif; 271 struct in6_multi *in6m; 272 struct in6_addr mld_addr, all_in6; 273 struct in6_ifaddr *ia; 274 struct ifmultiaddr *ifma; 275 int timer; /* timer value in the MLD query header */ 276 277 #ifndef PULLDOWN_TEST 278 IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),); 279 mldh = (struct mld_hdr *)(mtod(m, caddr_t) + off); 280 #else 281 IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); 282 if (mldh == NULL) { 283 icmp6stat.icp6s_tooshort++; 284 return; 285 } 286 #endif 287 288 /* source address validation */ 289 ip6 = mtod(m, struct ip6_hdr *); /* in case mpullup */ 290 if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { 291 char ip6bufs[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 292 log(LOG_ERR, 293 "mld6_input: src %s is not link-local (grp=%s)\n", 294 ip6_sprintf(ip6bufs, &ip6->ip6_src), 295 ip6_sprintf(ip6bufg, &mldh->mld_addr)); 296 /* 297 * spec (RFC2710) does not explicitly 298 * specify to discard the packet from a non link-local 299 * source address. But we believe it's expected to do so. 300 * XXX: do we have to allow :: as source? 301 */ 302 m_freem(m); 303 return; 304 } 305 306 /* 307 * make a copy for local work (in6_setscope() may modify the 1st arg) 308 */ 309 mld_addr = mldh->mld_addr; 310 if (in6_setscope(&mld_addr, ifp, NULL)) { 311 /* XXX: this should not happen! */ 312 m_free(m); 313 return; 314 } 315 316 /* 317 * In the MLD6 specification, there are 3 states and a flag. 318 * 319 * In Non-Listener state, we simply don't have a membership record. 320 * In Delaying Listener state, our timer is running (in6m->in6m_timer) 321 * In Idle Listener state, our timer is not running 322 * (in6m->in6m_timer==IN6M_TIMER_UNDEF) 323 * 324 * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if 325 * we have heard a report from another member, or MLD_IREPORTEDLAST 326 * if we sent the last report. 327 */ 328 switch(mldh->mld_type) { 329 case MLD_LISTENER_QUERY: 330 if (ifp->if_flags & IFF_LOOPBACK) 331 break; 332 333 if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && 334 !IN6_IS_ADDR_MULTICAST(&mld_addr)) 335 break; /* print error or log stat? */ 336 337 all_in6 = in6addr_linklocal_allnodes; 338 if (in6_setscope(&all_in6, ifp, NULL)) { 339 /* XXX: this should not happen! */ 340 break; 341 } 342 343 /* 344 * - Start the timers in all of our membership records 345 * that the query applies to for the interface on 346 * which the query arrived excl. those that belong 347 * to the "all-nodes" group (ff02::1). 348 * - Restart any timer that is already running but has 349 * A value longer than the requested timeout. 350 * - Use the value specified in the query message as 351 * the maximum timeout. 352 */ 353 timer = ntohs(mldh->mld_maxdelay); 354 355 IFP_TO_IA6(ifp, ia); 356 if (ia == NULL) 357 break; 358 359 /* 360 * XXX: System timer resolution is too low to handle Max 361 * Response Delay, so set 1 to the internal timer even if 362 * the calculated value equals to zero when Max Response 363 * Delay is positive. 364 */ 365 timer = ntohs(mldh->mld_maxdelay) * PR_FASTHZ / MLD_TIMER_SCALE; 366 if (timer == 0 && mldh->mld_maxdelay) 367 timer = 1; 368 369 IF_ADDR_LOCK(ifp); 370 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 371 if (ifma->ifma_addr->sa_family != AF_INET6) 372 continue; 373 in6m = (struct in6_multi *)ifma->ifma_protospec; 374 375 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 376 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 377 IPV6_ADDR_SCOPE_LINKLOCAL) 378 continue; 379 380 if (IN6_IS_ADDR_UNSPECIFIED(&mld_addr) || 381 IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr)) { 382 if (timer == 0) { 383 /* send a report immediately */ 384 mld_stoptimer(in6m); 385 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, 386 NULL); 387 in6m->in6m_timer = 0; /* reset timer */ 388 in6m->in6m_state = MLD_IREPORTEDLAST; 389 } 390 else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || 391 mld_timerresid(in6m) > (u_long)timer) { 392 in6m->in6m_timer = arc4random() % 393 (int)((long)(timer * hz) / 1000); 394 mld_starttimer(in6m); 395 } 396 } 397 } 398 IF_ADDR_UNLOCK(ifp); 399 break; 400 401 case MLD_LISTENER_REPORT: 402 /* 403 * For fast leave to work, we have to know that we are the 404 * last person to send a report for this group. Reports 405 * can potentially get looped back if we are a multicast 406 * router, so discard reports sourced by me. 407 * Note that it is impossible to check IFF_LOOPBACK flag of 408 * ifp for this purpose, since ip6_mloopback pass the physical 409 * interface to looutput. 410 */ 411 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ 412 break; 413 414 if (!IN6_IS_ADDR_MULTICAST(&mld_addr)) 415 break; 416 417 /* 418 * If we belong to the group being reported, stop 419 * our timer for that group. 420 */ 421 IN6_LOOKUP_MULTI(mld_addr, ifp, in6m); 422 if (in6m) { 423 in6m->in6m_timer = 0; /* transit to idle state */ 424 in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ 425 } 426 break; 427 default: /* this is impossible */ 428 log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld_type); 429 break; 430 } 431 432 m_freem(m); 433 } 434 435 static void 436 mld6_sendpkt(struct in6_multi *in6m, int type, const struct in6_addr *dst) 437 { 438 struct mbuf *mh, *md; 439 struct mld_hdr *mldh; 440 struct ip6_hdr *ip6; 441 struct ip6_moptions im6o; 442 struct in6_ifaddr *ia; 443 struct ifnet *ifp = in6m->in6m_ifp; 444 struct ifnet *outif = NULL; 445 446 /* 447 * At first, find a link local address on the outgoing interface 448 * to use as the source address of the MLD packet. 449 */ 450 if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST)) 451 == NULL) 452 return; 453 454 /* 455 * Allocate mbufs to store ip6 header and MLD header. 456 * We allocate 2 mbufs and make chain in advance because 457 * it is more convenient when inserting the hop-by-hop option later. 458 */ 459 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 460 if (mh == NULL) 461 return; 462 MGET(md, M_DONTWAIT, MT_DATA); 463 if (md == NULL) { 464 m_free(mh); 465 return; 466 } 467 mh->m_next = md; 468 469 mh->m_pkthdr.rcvif = NULL; 470 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr); 471 mh->m_len = sizeof(struct ip6_hdr); 472 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 473 474 /* fill in the ip6 header */ 475 ip6 = mtod(mh, struct ip6_hdr *); 476 ip6->ip6_flow = 0; 477 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 478 ip6->ip6_vfc |= IPV6_VERSION; 479 /* ip6_plen will be set later */ 480 ip6->ip6_nxt = IPPROTO_ICMPV6; 481 /* ip6_hlim will be set by im6o.im6o_multicast_hlim */ 482 ip6->ip6_src = ia->ia_addr.sin6_addr; 483 ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; 484 485 /* fill in the MLD header */ 486 md->m_len = sizeof(struct mld_hdr); 487 mldh = mtod(md, struct mld_hdr *); 488 mldh->mld_type = type; 489 mldh->mld_code = 0; 490 mldh->mld_cksum = 0; 491 /* XXX: we assume the function will not be called for query messages */ 492 mldh->mld_maxdelay = 0; 493 mldh->mld_reserved = 0; 494 mldh->mld_addr = in6m->in6m_addr; 495 in6_clearscope(&mldh->mld_addr); /* XXX */ 496 mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), 497 sizeof(struct mld_hdr)); 498 499 /* construct multicast option */ 500 bzero(&im6o, sizeof(im6o)); 501 im6o.im6o_multicast_ifp = ifp; 502 im6o.im6o_multicast_hlim = 1; 503 504 /* 505 * Request loopback of the report if we are acting as a multicast 506 * router, so that the process-level routing daemon can hear it. 507 */ 508 im6o.im6o_multicast_loop = (ip6_mrouter != NULL); 509 510 /* increment output statictics */ 511 icmp6stat.icp6s_outhist[type]++; 512 513 ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif, NULL); 514 if (outif) { 515 icmp6_ifstat_inc(outif, ifs6_out_msg); 516 switch (type) { 517 case MLD_LISTENER_QUERY: 518 icmp6_ifstat_inc(outif, ifs6_out_mldquery); 519 break; 520 case MLD_LISTENER_REPORT: 521 icmp6_ifstat_inc(outif, ifs6_out_mldreport); 522 break; 523 case MLD_LISTENER_DONE: 524 icmp6_ifstat_inc(outif, ifs6_out_mlddone); 525 break; 526 } 527 } 528 } 529 530 /* 531 * Add an address to the list of IP6 multicast addresses for a given interface. 532 * Add source addresses to the list also, if upstream router is MLDv2 capable 533 * and the number of source is not 0. 534 */ 535 struct in6_multi * 536 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, 537 int *errorp, int delay) 538 { 539 struct in6_multi *in6m; 540 541 *errorp = 0; 542 in6m = NULL; 543 544 IFF_LOCKGIANT(ifp); 545 /*IN6_MULTI_LOCK();*/ 546 547 IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); 548 if (in6m != NULL) { 549 /* 550 * If we already joined this group, just bump the 551 * refcount and return it. 552 */ 553 KASSERT(in6m->in6m_refcount >= 1, 554 ("%s: bad refcount %d", __func__, in6m->in6m_refcount)); 555 ++in6m->in6m_refcount; 556 } else do { 557 struct in6_multi *nin6m; 558 struct ifmultiaddr *ifma; 559 struct sockaddr_in6 sa6; 560 561 bzero(&sa6, sizeof(sa6)); 562 sa6.sin6_family = AF_INET6; 563 sa6.sin6_len = sizeof(struct sockaddr_in6); 564 sa6.sin6_addr = *maddr6; 565 566 *errorp = if_addmulti(ifp, (struct sockaddr *)&sa6, &ifma); 567 if (*errorp) 568 break; 569 570 /* 571 * If ifma->ifma_protospec is null, then if_addmulti() created 572 * a new record. Otherwise, bump refcount, and we are done. 573 */ 574 if (ifma->ifma_protospec != NULL) { 575 in6m = ifma->ifma_protospec; 576 ++in6m->in6m_refcount; 577 break; 578 } 579 580 nin6m = malloc(sizeof(*nin6m), M_IP6MADDR, M_NOWAIT | M_ZERO); 581 if (nin6m == NULL) { 582 if_delmulti_ifma(ifma); 583 break; 584 } 585 586 nin6m->in6m_addr = *maddr6; 587 nin6m->in6m_ifp = ifp; 588 nin6m->in6m_refcount = 1; 589 nin6m->in6m_ifma = ifma; 590 ifma->ifma_protospec = nin6m; 591 592 nin6m->in6m_timer_ch = malloc(sizeof(*nin6m->in6m_timer_ch), 593 M_IP6MADDR, M_NOWAIT); 594 if (nin6m->in6m_timer_ch == NULL) { 595 free(nin6m, M_IP6MADDR); 596 if_delmulti_ifma(ifma); 597 break; 598 } 599 600 LIST_INSERT_HEAD(&in6_multihead, nin6m, in6m_entry); 601 602 callout_init(nin6m->in6m_timer_ch, 0); 603 nin6m->in6m_timer = delay; 604 if (nin6m->in6m_timer > 0) { 605 nin6m->in6m_state = MLD_REPORTPENDING; 606 mld_starttimer(nin6m); 607 } 608 609 mld6_start_listening(nin6m); 610 611 in6m = nin6m; 612 613 } while (0); 614 615 /*IN6_MULTI_UNLOCK();*/ 616 IFF_UNLOCKGIANT(ifp); 617 618 return (in6m); 619 } 620 621 /* 622 * Delete a multicast address record. 623 * 624 * TODO: Locking, as per netinet. 625 */ 626 void 627 in6_delmulti(struct in6_multi *in6m) 628 { 629 struct ifmultiaddr *ifma; 630 631 KASSERT(in6m->in6m_refcount >= 1, ("%s: freeing freed in6m", __func__)); 632 633 if (--in6m->in6m_refcount == 0) { 634 mld_stoptimer(in6m); 635 mld6_stop_listening(in6m); 636 637 ifma = in6m->in6m_ifma; 638 KASSERT(ifma->ifma_protospec == in6m, 639 ("%s: ifma_protospec != in6m", __func__)); 640 ifma->ifma_protospec = NULL; 641 642 LIST_REMOVE(in6m, in6m_entry); 643 free(in6m->in6m_timer_ch, M_IP6MADDR); 644 free(in6m, M_IP6MADDR); 645 646 if_delmulti_ifma(ifma); 647 } 648 }
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