mld6.c revision 182713
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: head/sys/netinet6/mld6.c 182713 2008-09-03 08:13:58Z bz $"); 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#include <sys/vimage.h> 83 84#include <net/if.h> 85 86#include <netinet/in.h> 87#include <netinet/in_var.h> 88#include <netinet6/in6_var.h> 89#include <netinet/ip6.h> 90#include <netinet6/ip6_var.h> 91#include <netinet6/scope6_var.h> 92#include <netinet/icmp6.h> 93#include <netinet6/mld6_var.h> 94 95/* 96 * Protocol constants 97 */ 98 99/* denotes that the MLD max response delay field specifies time in milliseconds */ 100#define MLD_TIMER_SCALE 1000 101/* 102 * time between repetitions of a node's initial report of interest in a 103 * multicast address(in seconds) 104 */ 105#define MLD_UNSOLICITED_REPORT_INTERVAL 10 106 107static struct ip6_pktopts ip6_opts; 108 109static void mld6_sendpkt(struct in6_multi *, int, const struct in6_addr *); 110static void mld_starttimer(struct in6_multi *); 111static void mld_stoptimer(struct in6_multi *); 112static void mld_timeo(struct in6_multi *); 113static u_long mld_timerresid(struct in6_multi *); 114 115void 116mld6_init(void) 117{ 118 static u_int8_t hbh_buf[8]; 119 struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf; 120 u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD); 121 122 /* ip6h_nxt will be fill in later */ 123 hbh->ip6h_len = 0; /* (8 >> 3) - 1 */ 124 125 /* XXX: grotty hard coding... */ 126 hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */ 127 hbh_buf[3] = 0; 128 hbh_buf[4] = IP6OPT_ROUTER_ALERT; 129 hbh_buf[5] = IP6OPT_RTALERT_LEN - 2; 130 bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t)); 131 132 ip6_initpktopts(&V_ip6_opts); 133 V_ip6_opts.ip6po_hbh = hbh; 134} 135 136static void 137mld_starttimer(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 (*)(void *))mld_timeo, in6m); 153} 154 155static void 156mld_stoptimer(struct in6_multi *in6m) 157{ 158 if (in6m->in6m_timer == IN6M_TIMER_UNDEF) 159 return; 160 161 callout_stop(in6m->in6m_timer_ch); 162 in6m->in6m_timer = IN6M_TIMER_UNDEF; 163} 164 165static void 166mld_timeo(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 186static u_long 187mld_timerresid(struct in6_multi *in6m) 188{ 189 struct timeval now, diff; 190 191 microtime(&now); 192 193 if (now.tv_sec > in6m->in6m_timer_expire.tv_sec || 194 (now.tv_sec == in6m->in6m_timer_expire.tv_sec && 195 now.tv_usec > in6m->in6m_timer_expire.tv_usec)) { 196 return (0); 197 } 198 diff = in6m->in6m_timer_expire; 199 diff.tv_sec -= now.tv_sec; 200 diff.tv_usec -= now.tv_usec; 201 if (diff.tv_usec < 0) { 202 diff.tv_sec--; 203 diff.tv_usec += 1000000; 204 } 205 206 /* return the remaining time in milliseconds */ 207 return (((u_long)(diff.tv_sec * 1000000 + diff.tv_usec)) / 1000); 208} 209 210void 211mld6_start_listening(struct in6_multi *in6m) 212{ 213 struct in6_addr all_in6; 214 int s = splnet(); 215 216 /* 217 * RFC2710 page 10: 218 * The node never sends a Report or Done for the link-scope all-nodes 219 * address. 220 * MLD messages are never sent for multicast addresses whose scope is 0 221 * (reserved) or 1 (node-local). 222 */ 223 all_in6 = in6addr_linklocal_allnodes; 224 if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) { 225 /* XXX: this should not happen! */ 226 in6m->in6m_timer = 0; 227 in6m->in6m_state = MLD_OTHERLISTENER; 228 } 229 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 230 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 231 IPV6_ADDR_SCOPE_LINKLOCAL) { 232 in6m->in6m_timer = 0; 233 in6m->in6m_state = MLD_OTHERLISTENER; 234 } else { 235 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); 236 in6m->in6m_timer = arc4random() % 237 MLD_UNSOLICITED_REPORT_INTERVAL * hz; 238 in6m->in6m_state = MLD_IREPORTEDLAST; 239 240 mld_starttimer(in6m); 241 } 242 splx(s); 243} 244 245void 246mld6_stop_listening(struct in6_multi *in6m) 247{ 248 struct in6_addr allnode, allrouter; 249 250 allnode = in6addr_linklocal_allnodes; 251 if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) { 252 /* XXX: this should not happen! */ 253 return; 254 } 255 allrouter = in6addr_linklocal_allrouters; 256 if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) { 257 /* XXX impossible */ 258 return; 259 } 260 if (in6m->in6m_state == MLD_IREPORTEDLAST && 261 !IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode) && 262 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > 263 IPV6_ADDR_SCOPE_INTFACELOCAL) { 264 mld6_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter); 265 } 266} 267 268void 269mld6_input(struct mbuf *m, int off) 270{ 271 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 272 struct mld_hdr *mldh; 273 struct ifnet *ifp = m->m_pkthdr.rcvif; 274 struct in6_multi *in6m; 275 struct in6_addr mld_addr, all_in6; 276 struct in6_ifaddr *ia; 277 struct ifmultiaddr *ifma; 278 u_long timer; /* timer value in the MLD query header */ 279 280#ifndef PULLDOWN_TEST 281 IP6_EXTHDR_CHECK(m, off, sizeof(*mldh),); 282 mldh = (struct mld_hdr *)(mtod(m, caddr_t) + off); 283#else 284 IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); 285 if (mldh == NULL) { 286 V_icmp6stat.icp6s_tooshort++; 287 return; 288 } 289#endif 290 291 /* source address validation */ 292 ip6 = mtod(m, struct ip6_hdr *); /* in case mpullup */ 293 if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { 294 char ip6bufs[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 295 log(LOG_ERR, 296 "mld6_input: src %s is not link-local (grp=%s)\n", 297 ip6_sprintf(ip6bufs, &ip6->ip6_src), 298 ip6_sprintf(ip6bufg, &mldh->mld_addr)); 299 /* 300 * spec (RFC2710) does not explicitly 301 * specify to discard the packet from a non link-local 302 * source address. But we believe it's expected to do so. 303 * XXX: do we have to allow :: as source? 304 */ 305 m_freem(m); 306 return; 307 } 308 309 /* 310 * make a copy for local work (in6_setscope() may modify the 1st arg) 311 */ 312 mld_addr = mldh->mld_addr; 313 if (in6_setscope(&mld_addr, ifp, NULL)) { 314 /* XXX: this should not happen! */ 315 m_free(m); 316 return; 317 } 318 319 /* 320 * In the MLD6 specification, there are 3 states and a flag. 321 * 322 * In Non-Listener state, we simply don't have a membership record. 323 * In Delaying Listener state, our timer is running (in6m->in6m_timer) 324 * In Idle Listener state, our timer is not running 325 * (in6m->in6m_timer==IN6M_TIMER_UNDEF) 326 * 327 * The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if 328 * we have heard a report from another member, or MLD_IREPORTEDLAST 329 * if we sent the last report. 330 */ 331 switch(mldh->mld_type) { 332 case MLD_LISTENER_QUERY: 333 if (ifp->if_flags & IFF_LOOPBACK) 334 break; 335 336 if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && 337 !IN6_IS_ADDR_MULTICAST(&mld_addr)) 338 break; /* print error or log stat? */ 339 340 all_in6 = in6addr_linklocal_allnodes; 341 if (in6_setscope(&all_in6, ifp, NULL)) { 342 /* XXX: this should not happen! */ 343 break; 344 } 345 346 /* 347 * - Start the timers in all of our membership records 348 * that the query applies to for the interface on 349 * which the query arrived excl. those that belong 350 * to the "all-nodes" group (ff02::1). 351 * - Restart any timer that is already running but has 352 * A value longer than the requested timeout. 353 * - Use the value specified in the query message as 354 * the maximum timeout. 355 */ 356 timer = ntohs(mldh->mld_maxdelay); 357 358 IFP_TO_IA6(ifp, ia); 359 if (ia == NULL) 360 break; 361 362 /* 363 * XXX: System timer resolution is too low to handle Max 364 * Response Delay, so set 1 to the internal timer even if 365 * the calculated value equals to zero when Max Response 366 * Delay is positive. 367 */ 368 timer = ntohs(mldh->mld_maxdelay) * PR_FASTHZ / MLD_TIMER_SCALE; 369 if (timer == 0 && mldh->mld_maxdelay) 370 timer = 1; 371 372 IF_ADDR_LOCK(ifp); 373 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 374 if (ifma->ifma_addr->sa_family != AF_INET6) 375 continue; 376 in6m = (struct in6_multi *)ifma->ifma_protospec; 377 378 if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || 379 IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < 380 IPV6_ADDR_SCOPE_LINKLOCAL) 381 continue; 382 383 if (IN6_IS_ADDR_UNSPECIFIED(&mld_addr) || 384 IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr)) { 385 if (timer == 0) { 386 /* send a report immediately */ 387 mld_stoptimer(in6m); 388 mld6_sendpkt(in6m, MLD_LISTENER_REPORT, 389 NULL); 390 in6m->in6m_timer = 0; /* reset timer */ 391 in6m->in6m_state = MLD_IREPORTEDLAST; 392 } 393 else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || 394 mld_timerresid(in6m) > timer) { 395 in6m->in6m_timer = 396 1 + (arc4random() % timer) * hz / 1000; 397 mld_starttimer(in6m); 398 } 399 } 400 } 401 IF_ADDR_UNLOCK(ifp); 402 break; 403 404 case MLD_LISTENER_REPORT: 405 /* 406 * For fast leave to work, we have to know that we are the 407 * last person to send a report for this group. Reports 408 * can potentially get looped back if we are a multicast 409 * router, so discard reports sourced by me. 410 * Note that it is impossible to check IFF_LOOPBACK flag of 411 * ifp for this purpose, since ip6_mloopback pass the physical 412 * interface to looutput. 413 */ 414 if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ 415 break; 416 417 if (!IN6_IS_ADDR_MULTICAST(&mld_addr)) 418 break; 419 420 /* 421 * If we belong to the group being reported, stop 422 * our timer for that group. 423 */ 424 IN6_LOOKUP_MULTI(mld_addr, ifp, in6m); 425 if (in6m) { 426 in6m->in6m_timer = 0; /* transit to idle state */ 427 in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ 428 } 429 break; 430 default: /* this is impossible */ 431 log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld_type); 432 break; 433 } 434 435 m_freem(m); 436} 437 438static void 439mld6_sendpkt(struct in6_multi *in6m, int type, const struct in6_addr *dst) 440{ 441 struct mbuf *mh, *md; 442 struct mld_hdr *mldh; 443 struct ip6_hdr *ip6; 444 struct ip6_moptions im6o; 445 struct in6_ifaddr *ia; 446 struct ifnet *ifp = in6m->in6m_ifp; 447 struct ifnet *outif = NULL; 448 449 /* 450 * At first, find a link local address on the outgoing interface 451 * to use as the source address of the MLD packet. 452 */ 453 if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST)) 454 == NULL) 455 return; 456 457 /* 458 * Allocate mbufs to store ip6 header and MLD header. 459 * We allocate 2 mbufs and make chain in advance because 460 * it is more convenient when inserting the hop-by-hop option later. 461 */ 462 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 463 if (mh == NULL) 464 return; 465 MGET(md, M_DONTWAIT, MT_DATA); 466 if (md == NULL) { 467 m_free(mh); 468 return; 469 } 470 mh->m_next = md; 471 472 mh->m_pkthdr.rcvif = NULL; 473 mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld_hdr); 474 mh->m_len = sizeof(struct ip6_hdr); 475 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 476 477 /* fill in the ip6 header */ 478 ip6 = mtod(mh, struct ip6_hdr *); 479 ip6->ip6_flow = 0; 480 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 481 ip6->ip6_vfc |= IPV6_VERSION; 482 /* ip6_plen will be set later */ 483 ip6->ip6_nxt = IPPROTO_ICMPV6; 484 /* ip6_hlim will be set by im6o.im6o_multicast_hlim */ 485 ip6->ip6_src = ia->ia_addr.sin6_addr; 486 ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; 487 488 /* fill in the MLD header */ 489 md->m_len = sizeof(struct mld_hdr); 490 mldh = mtod(md, struct mld_hdr *); 491 mldh->mld_type = type; 492 mldh->mld_code = 0; 493 mldh->mld_cksum = 0; 494 /* XXX: we assume the function will not be called for query messages */ 495 mldh->mld_maxdelay = 0; 496 mldh->mld_reserved = 0; 497 mldh->mld_addr = in6m->in6m_addr; 498 in6_clearscope(&mldh->mld_addr); /* XXX */ 499 mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), 500 sizeof(struct mld_hdr)); 501 502 /* construct multicast option */ 503 bzero(&im6o, sizeof(im6o)); 504 im6o.im6o_multicast_ifp = ifp; 505 im6o.im6o_multicast_hlim = 1; 506 507 /* 508 * Request loopback of the report if we are acting as a multicast 509 * router, so that the process-level routing daemon can hear it. 510 */ 511 im6o.im6o_multicast_loop = (ip6_mrouter != NULL); 512 513 /* increment output statictics */ 514 V_icmp6stat.icp6s_outhist[type]++; 515 516 ip6_output(mh, &V_ip6_opts, NULL, 0, &im6o, &outif, NULL); 517 if (outif) { 518 icmp6_ifstat_inc(outif, ifs6_out_msg); 519 switch (type) { 520 case MLD_LISTENER_QUERY: 521 icmp6_ifstat_inc(outif, ifs6_out_mldquery); 522 break; 523 case MLD_LISTENER_REPORT: 524 icmp6_ifstat_inc(outif, ifs6_out_mldreport); 525 break; 526 case MLD_LISTENER_DONE: 527 icmp6_ifstat_inc(outif, ifs6_out_mlddone); 528 break; 529 } 530 } 531} 532 533/* 534 * Add an address to the list of IP6 multicast addresses for a given interface. 535 * Add source addresses to the list also, if upstream router is MLDv2 capable 536 * and the number of source is not 0. 537 */ 538struct in6_multi * 539in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, 540 int *errorp, int delay) 541{ 542 struct in6_multi *in6m; 543 544 *errorp = 0; 545 in6m = NULL; 546 547 IFF_LOCKGIANT(ifp); 548 /*IN6_MULTI_LOCK();*/ 549 550 IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); 551 if (in6m != NULL) { 552 /* 553 * If we already joined this group, just bump the 554 * refcount and return it. 555 */ 556 KASSERT(in6m->in6m_refcount >= 1, 557 ("%s: bad refcount %d", __func__, in6m->in6m_refcount)); 558 ++in6m->in6m_refcount; 559 } else do { 560 struct in6_multi *nin6m; 561 struct ifmultiaddr *ifma; 562 struct sockaddr_in6 sa6; 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; 568 569 *errorp = if_addmulti(ifp, (struct sockaddr *)&sa6, &ifma); 570 if (*errorp) 571 break; 572 573 /* 574 * If ifma->ifma_protospec is null, then if_addmulti() created 575 * a new record. Otherwise, bump refcount, and we are done. 576 */ 577 if (ifma->ifma_protospec != NULL) { 578 in6m = ifma->ifma_protospec; 579 ++in6m->in6m_refcount; 580 break; 581 } 582 583 nin6m = malloc(sizeof(*nin6m), M_IP6MADDR, M_NOWAIT | M_ZERO); 584 if (nin6m == NULL) { 585 if_delmulti_ifma(ifma); 586 break; 587 } 588 589 nin6m->in6m_addr = *maddr6; 590 nin6m->in6m_ifp = ifp; 591 nin6m->in6m_refcount = 1; 592 nin6m->in6m_ifma = ifma; 593 ifma->ifma_protospec = nin6m; 594 595 nin6m->in6m_timer_ch = malloc(sizeof(*nin6m->in6m_timer_ch), 596 M_IP6MADDR, M_NOWAIT); 597 if (nin6m->in6m_timer_ch == NULL) { 598 free(nin6m, M_IP6MADDR); 599 if_delmulti_ifma(ifma); 600 break; 601 } 602 603 LIST_INSERT_HEAD(&in6_multihead, nin6m, in6m_entry); 604 605 callout_init(nin6m->in6m_timer_ch, 0); 606 nin6m->in6m_timer = delay; 607 if (nin6m->in6m_timer > 0) { 608 nin6m->in6m_state = MLD_REPORTPENDING; 609 mld_starttimer(nin6m); 610 } 611 612 mld6_start_listening(nin6m); 613 614 in6m = nin6m; 615 616 } while (0); 617 618 /*IN6_MULTI_UNLOCK();*/ 619 IFF_UNLOCKGIANT(ifp); 620 621 return (in6m); 622} 623 624/* 625 * Delete a multicast address record. 626 * 627 * TODO: Locking, as per netinet. 628 */ 629void 630in6_delmulti(struct in6_multi *in6m) 631{ 632 struct ifmultiaddr *ifma; 633 634 KASSERT(in6m->in6m_refcount >= 1, ("%s: freeing freed in6m", __func__)); 635 636 if (--in6m->in6m_refcount == 0) { 637 mld_stoptimer(in6m); 638 mld6_stop_listening(in6m); 639 640 ifma = in6m->in6m_ifma; 641 KASSERT(ifma->ifma_protospec == in6m, 642 ("%s: ifma_protospec != in6m", __func__)); 643 ifma->ifma_protospec = NULL; 644 645 LIST_REMOVE(in6m, in6m_entry); 646 free(in6m->in6m_timer_ch, M_IP6MADDR); 647 free(in6m, M_IP6MADDR); 648 649 if_delmulti_ifma(ifma); 650 } 651} 652