mld6.c revision 151539
1/* $FreeBSD: head/sys/netinet6/mld6.c 151539 2005-10-21 16:23:01Z 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 106static struct ip6_pktopts ip6_opts; 107 108static void mld6_sendpkt(struct in6_multi *, int, const struct in6_addr *); 109static void mld_starttimer(struct in6_multi *); 110static void mld_stoptimer(struct in6_multi *); 111static void mld_timeo(struct in6_multi *); 112static u_long mld_timerresid(struct in6_multi *); 113 114void 115mld6_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 135static void 136mld_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 155static void 156mld_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 166static void 167mld_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 188static u_long 189mld_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 213void 214mld6_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 249void 250mld6_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 273void 274mld6_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 (in6m->in6m_timer==0) 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 == 0 || /*idle state*/ 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 443static void 444mld6_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 */ 546struct in6_multi * 547in6_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 */ 628void 629in6_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 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