1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2007-2009 Bruce Simpson. 5 * Copyright (c) 1988 Stephen Deering. 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Stephen Deering of Stanford University. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)igmp.c 8.1 (Berkeley) 7/19/93 37 */ 38 39 /* 40 * Internet Group Management Protocol (IGMP) routines. 41 * [RFC1112, RFC2236, RFC3376] 42 * 43 * Written by Steve Deering, Stanford, May 1988. 44 * Modified by Rosen Sharma, Stanford, Aug 1994. 45 * Modified by Bill Fenner, Xerox PARC, Feb 1995. 46 * Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995. 47 * Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson. 48 * 49 * MULTICAST Revision: 3.5.1.4 50 */ 51 52 #include <sys/cdefs.h> 53 __FBSDID("$FreeBSD$"); 54 55 #include "opt_ddb.h" 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/module.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/socket.h> 63 #include <sys/protosw.h> 64 #include <sys/kernel.h> 65 #include <sys/lock.h> 66 #include <sys/rmlock.h> 67 #include <sys/sysctl.h> 68 #include <sys/ktr.h> 69 #include <sys/condvar.h> 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #endif 74 75 #include <net/if.h> 76 #include <net/if_var.h> 77 #include <net/netisr.h> 78 #include <net/vnet.h> 79 80 #include <netinet/in.h> 81 #include <netinet/in_var.h> 82 #include <netinet/in_systm.h> 83 #include <netinet/ip.h> 84 #include <netinet/ip_var.h> 85 #include <netinet/ip_options.h> 86 #include <netinet/igmp.h> 87 #include <netinet/igmp_var.h> 88 89 #include <machine/in_cksum.h> 90 91 #include <security/mac/mac_framework.h> 92 93 #ifndef KTR_IGMPV3 94 #define KTR_IGMPV3 KTR_INET 95 #endif 96 97 static struct igmp_ifsoftc * 98 igi_alloc_locked(struct ifnet *); 99 static void igi_delete_locked(const struct ifnet *); 100 static void igmp_dispatch_queue(struct mbufq *, int, const int); 101 static void igmp_fasttimo_vnet(void); 102 static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 103 static int igmp_handle_state_change(struct in_multi *, 104 struct igmp_ifsoftc *); 105 static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 106 static int igmp_input_v1_query(struct ifnet *, const struct ip *, 107 const struct igmp *); 108 static int igmp_input_v2_query(struct ifnet *, const struct ip *, 109 const struct igmp *); 110 static int igmp_input_v3_query(struct ifnet *, const struct ip *, 111 /*const*/ struct igmpv3 *); 112 static int igmp_input_v3_group_query(struct in_multi *, 113 struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 114 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 115 /*const*/ struct igmp *); 116 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 117 /*const*/ struct igmp *); 118 static void igmp_intr(struct mbuf *); 119 static int igmp_isgroupreported(const struct in_addr); 120 static struct mbuf * 121 igmp_ra_alloc(void); 122 #ifdef KTR 123 static char * igmp_rec_type_to_str(const int); 124 #endif 125 static void igmp_set_version(struct igmp_ifsoftc *, const int); 126 static void igmp_slowtimo_vnet(void); 127 static int igmp_v1v2_queue_report(struct in_multi *, const int); 128 static void igmp_v1v2_process_group_timer(struct in_multi *, const int); 129 static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 130 static void igmp_v2_update_group(struct in_multi *, const int); 131 static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 132 static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 133 static struct mbuf * 134 igmp_v3_encap_report(struct ifnet *, struct mbuf *); 135 static int igmp_v3_enqueue_group_record(struct mbufq *, 136 struct in_multi *, const int, const int, const int); 137 static int igmp_v3_enqueue_filter_change(struct mbufq *, 138 struct in_multi *); 139 static void igmp_v3_process_group_timers(struct in_multi_head *, 140 struct mbufq *, struct mbufq *, struct in_multi *, 141 const int); 142 static int igmp_v3_merge_state_changes(struct in_multi *, 143 struct mbufq *); 144 static void igmp_v3_suppress_group_record(struct in_multi *); 145 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 146 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 147 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 148 static int sysctl_igmp_stat(SYSCTL_HANDLER_ARGS); 149 150 static const struct netisr_handler igmp_nh = { 151 .nh_name = "igmp", 152 .nh_handler = igmp_intr, 153 .nh_proto = NETISR_IGMP, 154 .nh_policy = NETISR_POLICY_SOURCE, 155 }; 156 157 /* 158 * System-wide globals. 159 * 160 * Unlocked access to these is OK, except for the global IGMP output 161 * queue. The IGMP subsystem lock ends up being system-wide for the moment, 162 * because all VIMAGEs have to share a global output queue, as netisrs 163 * themselves are not virtualized. 164 * 165 * Locking: 166 * * The permitted lock order is: IN_MULTI_LIST_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 167 * Any may be taken independently; if any are held at the same 168 * time, the above lock order must be followed. 169 * * All output is delegated to the netisr. 170 * Now that Giant has been eliminated, the netisr may be inlined. 171 * * IN_MULTI_LIST_LOCK covers in_multi. 172 * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 173 * including the output queue. 174 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 175 * per-link state iterators. 176 * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 177 * therefore it is not refcounted. 178 * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 179 * 180 * Reference counting 181 * * IGMP acquires its own reference every time an in_multi is passed to 182 * it and the group is being joined for the first time. 183 * * IGMP releases its reference(s) on in_multi in a deferred way, 184 * because the operations which process the release run as part of 185 * a loop whose control variables are directly affected by the release 186 * (that, and not recursing on the IF_ADDR_LOCK). 187 * 188 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 189 * to a vnet in ifp->if_vnet. 190 * 191 * SMPng: XXX We may potentially race operations on ifma_protospec. 192 * The problem is that we currently lack a clean way of taking the 193 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 194 * as anything which modifies ifma needs to be covered by that lock. 195 * So check for ifma_protospec being NULL before proceeding. 196 */ 197 struct mtx igmp_mtx; 198 199 struct mbuf *m_raopt; /* Router Alert option */ 200 static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 201 202 /* 203 * VIMAGE-wide globals. 204 * 205 * The IGMPv3 timers themselves need to run per-image, however, 206 * protosw timers run globally (see tcp). 207 * An ifnet can only be in one vimage at a time, and the loopback 208 * ifnet, loif, is itself virtualized. 209 * It would otherwise be possible to seriously hose IGMP state, 210 * and create inconsistencies in upstream multicast routing, if you have 211 * multiple VIMAGEs running on the same link joining different multicast 212 * groups, UNLESS the "primary IP address" is different. This is because 213 * IGMP for IPv4 does not force link-local addresses to be used for each 214 * node, unlike MLD for IPv6. 215 * Obviously the IGMPv3 per-interface state has per-vimage granularity 216 * also as a result. 217 * 218 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 219 * policy to control the address used by IGMP on the link. 220 */ 221 VNET_DEFINE_STATIC(int, interface_timers_running); /* IGMPv3 general 222 * query response */ 223 VNET_DEFINE_STATIC(int, state_change_timers_running); /* IGMPv3 state-change 224 * retransmit */ 225 VNET_DEFINE_STATIC(int, current_state_timers_running); /* IGMPv1/v2 host 226 * report; IGMPv3 g/sg 227 * query response */ 228 229 #define V_interface_timers_running VNET(interface_timers_running) 230 #define V_state_change_timers_running VNET(state_change_timers_running) 231 #define V_current_state_timers_running VNET(current_state_timers_running) 232 233 VNET_DEFINE_STATIC(LIST_HEAD(, igmp_ifsoftc), igi_head) = 234 LIST_HEAD_INITIALIZER(igi_head); 235 VNET_DEFINE_STATIC(struct igmpstat, igmpstat) = { 236 .igps_version = IGPS_VERSION_3, 237 .igps_len = sizeof(struct igmpstat), 238 }; 239 VNET_DEFINE_STATIC(struct timeval, igmp_gsrdelay) = {10, 0}; 240 241 #define V_igi_head VNET(igi_head) 242 #define V_igmpstat VNET(igmpstat) 243 #define V_igmp_gsrdelay VNET(igmp_gsrdelay) 244 245 VNET_DEFINE_STATIC(int, igmp_recvifkludge) = 1; 246 VNET_DEFINE_STATIC(int, igmp_sendra) = 1; 247 VNET_DEFINE_STATIC(int, igmp_sendlocal) = 1; 248 VNET_DEFINE_STATIC(int, igmp_v1enable) = 1; 249 VNET_DEFINE_STATIC(int, igmp_v2enable) = 1; 250 VNET_DEFINE_STATIC(int, igmp_legacysupp); 251 VNET_DEFINE_STATIC(int, igmp_default_version) = IGMP_VERSION_3; 252 253 #define V_igmp_recvifkludge VNET(igmp_recvifkludge) 254 #define V_igmp_sendra VNET(igmp_sendra) 255 #define V_igmp_sendlocal VNET(igmp_sendlocal) 256 #define V_igmp_v1enable VNET(igmp_v1enable) 257 #define V_igmp_v2enable VNET(igmp_v2enable) 258 #define V_igmp_legacysupp VNET(igmp_legacysupp) 259 #define V_igmp_default_version VNET(igmp_default_version) 260 261 /* 262 * Virtualized sysctls. 263 */ 264 SYSCTL_PROC(_net_inet_igmp, IGMPCTL_STATS, stats, 265 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_MPSAFE, 266 &VNET_NAME(igmpstat), 0, sysctl_igmp_stat, "S,igmpstat", ""); 267 SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 268 &VNET_NAME(igmp_recvifkludge), 0, 269 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 270 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 271 &VNET_NAME(igmp_sendra), 0, 272 "Send IP Router Alert option in IGMPv2/v3 messages"); 273 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 274 &VNET_NAME(igmp_sendlocal), 0, 275 "Send IGMP membership reports for 224.0.0.0/24 groups"); 276 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 277 &VNET_NAME(igmp_v1enable), 0, 278 "Enable backwards compatibility with IGMPv1"); 279 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 280 &VNET_NAME(igmp_v2enable), 0, 281 "Enable backwards compatibility with IGMPv2"); 282 SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 283 &VNET_NAME(igmp_legacysupp), 0, 284 "Allow v1/v2 reports to suppress v3 group responses"); 285 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 286 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 287 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 288 "Default version of IGMP to run on each interface"); 289 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 290 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 291 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 292 "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 293 294 /* 295 * Non-virtualized sysctls. 296 */ 297 static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 298 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 299 "Per-interface IGMPv3 state"); 300 301 static __inline void 302 igmp_save_context(struct mbuf *m, struct ifnet *ifp) 303 { 304 305 #ifdef VIMAGE 306 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 307 #endif /* VIMAGE */ 308 m->m_pkthdr.rcvif = ifp; 309 m->m_pkthdr.flowid = ifp->if_index; 310 } 311 312 static __inline void 313 igmp_scrub_context(struct mbuf *m) 314 { 315 316 m->m_pkthdr.PH_loc.ptr = NULL; 317 m->m_pkthdr.flowid = 0; 318 } 319 320 /* 321 * Restore context from a queued IGMP output chain. 322 * Return saved ifindex. 323 * 324 * VIMAGE: The assertion is there to make sure that we 325 * actually called CURVNET_SET() with what's in the mbuf chain. 326 */ 327 static __inline uint32_t 328 igmp_restore_context(struct mbuf *m) 329 { 330 331 #ifdef notyet 332 #if defined(VIMAGE) && defined(INVARIANTS) 333 KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 334 ("%s: called when curvnet was not restored", __func__)); 335 #endif 336 #endif 337 return (m->m_pkthdr.flowid); 338 } 339 340 /* 341 * IGMP statistics. 342 */ 343 static int 344 sysctl_igmp_stat(SYSCTL_HANDLER_ARGS) 345 { 346 struct igmpstat igps0; 347 int error; 348 char *p; 349 350 error = sysctl_wire_old_buffer(req, sizeof(V_igmpstat)); 351 if (error) 352 return (error); 353 354 if (req->oldptr != NULL) { 355 if (req->oldlen < sizeof(V_igmpstat)) 356 error = ENOMEM; 357 else 358 error = SYSCTL_OUT(req, &V_igmpstat, 359 sizeof(V_igmpstat)); 360 } else 361 req->validlen = sizeof(V_igmpstat); 362 if (error) 363 goto out; 364 if (req->newptr != NULL) { 365 if (req->newlen < sizeof(V_igmpstat)) 366 error = ENOMEM; 367 else 368 error = SYSCTL_IN(req, &igps0, 369 sizeof(igps0)); 370 if (error) 371 goto out; 372 /* 373 * igps0 must be "all zero". 374 */ 375 p = (char *)&igps0; 376 while (*p == '\0' && p < (char *)&igps0 + sizeof(igps0)) 377 p++; 378 if (p != (char *)&igps0 + sizeof(igps0)) { 379 error = EINVAL; 380 goto out; 381 } 382 /* 383 * Avoid overwrite of the version and length field. 384 */ 385 igps0.igps_version = V_igmpstat.igps_version; 386 igps0.igps_len = V_igmpstat.igps_len; 387 bcopy(&igps0, &V_igmpstat, sizeof(V_igmpstat)); 388 } 389 out: 390 return (error); 391 } 392 393 /* 394 * Retrieve or set default IGMP version. 395 * 396 * VIMAGE: Assume curvnet set by caller. 397 * SMPng: NOTE: Serialized by IGMP lock. 398 */ 399 static int 400 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 401 { 402 int error; 403 int new; 404 405 error = sysctl_wire_old_buffer(req, sizeof(int)); 406 if (error) 407 return (error); 408 409 IGMP_LOCK(); 410 411 new = V_igmp_default_version; 412 413 error = sysctl_handle_int(oidp, &new, 0, req); 414 if (error || !req->newptr) 415 goto out_locked; 416 417 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 418 error = EINVAL; 419 goto out_locked; 420 } 421 422 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 423 V_igmp_default_version, new); 424 425 V_igmp_default_version = new; 426 427 out_locked: 428 IGMP_UNLOCK(); 429 return (error); 430 } 431 432 /* 433 * Retrieve or set threshold between group-source queries in seconds. 434 * 435 * VIMAGE: Assume curvnet set by caller. 436 * SMPng: NOTE: Serialized by IGMP lock. 437 */ 438 static int 439 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 440 { 441 int error; 442 int i; 443 444 error = sysctl_wire_old_buffer(req, sizeof(int)); 445 if (error) 446 return (error); 447 448 IGMP_LOCK(); 449 450 i = V_igmp_gsrdelay.tv_sec; 451 452 error = sysctl_handle_int(oidp, &i, 0, req); 453 if (error || !req->newptr) 454 goto out_locked; 455 456 if (i < -1 || i >= 60) { 457 error = EINVAL; 458 goto out_locked; 459 } 460 461 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 462 V_igmp_gsrdelay.tv_sec, i); 463 V_igmp_gsrdelay.tv_sec = i; 464 465 out_locked: 466 IGMP_UNLOCK(); 467 return (error); 468 } 469 470 /* 471 * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 472 * For use by ifmcstat(8). 473 * 474 * SMPng: NOTE: Does an unlocked ifindex space read. 475 * VIMAGE: Assume curvnet set by caller. The node handler itself 476 * is not directly virtualized. 477 */ 478 static int 479 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 480 { 481 int *name; 482 int error; 483 u_int namelen; 484 struct ifnet *ifp; 485 struct igmp_ifsoftc *igi; 486 487 name = (int *)arg1; 488 namelen = arg2; 489 490 if (req->newptr != NULL) 491 return (EPERM); 492 493 if (namelen != 1) 494 return (EINVAL); 495 496 error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo)); 497 if (error) 498 return (error); 499 500 IN_MULTI_LIST_LOCK(); 501 IGMP_LOCK(); 502 503 if (name[0] <= 0 || name[0] > V_if_index) { 504 error = ENOENT; 505 goto out_locked; 506 } 507 508 error = ENOENT; 509 510 ifp = ifnet_byindex(name[0]); 511 if (ifp == NULL) 512 goto out_locked; 513 514 LIST_FOREACH(igi, &V_igi_head, igi_link) { 515 if (ifp == igi->igi_ifp) { 516 struct igmp_ifinfo info; 517 518 info.igi_version = igi->igi_version; 519 info.igi_v1_timer = igi->igi_v1_timer; 520 info.igi_v2_timer = igi->igi_v2_timer; 521 info.igi_v3_timer = igi->igi_v3_timer; 522 info.igi_flags = igi->igi_flags; 523 info.igi_rv = igi->igi_rv; 524 info.igi_qi = igi->igi_qi; 525 info.igi_qri = igi->igi_qri; 526 info.igi_uri = igi->igi_uri; 527 error = SYSCTL_OUT(req, &info, sizeof(info)); 528 break; 529 } 530 } 531 532 out_locked: 533 IGMP_UNLOCK(); 534 IN_MULTI_LIST_UNLOCK(); 535 return (error); 536 } 537 538 /* 539 * Dispatch an entire queue of pending packet chains 540 * using the netisr. 541 * VIMAGE: Assumes the vnet pointer has been set. 542 */ 543 static void 544 igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 545 { 546 struct epoch_tracker et; 547 struct mbuf *m; 548 549 NET_EPOCH_ENTER(et); 550 while ((m = mbufq_dequeue(mq)) != NULL) { 551 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 552 if (loop) 553 m->m_flags |= M_IGMP_LOOP; 554 netisr_dispatch(NETISR_IGMP, m); 555 if (--limit == 0) 556 break; 557 } 558 NET_EPOCH_EXIT(et); 559 } 560 561 /* 562 * Filter outgoing IGMP report state by group. 563 * 564 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 565 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 566 * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 567 * this may break certain IGMP snooping switches which rely on the old 568 * report behaviour. 569 * 570 * Return zero if the given group is one for which IGMP reports 571 * should be suppressed, or non-zero if reports should be issued. 572 */ 573 static __inline int 574 igmp_isgroupreported(const struct in_addr addr) 575 { 576 577 if (in_allhosts(addr) || 578 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 579 return (0); 580 581 return (1); 582 } 583 584 /* 585 * Construct a Router Alert option to use in outgoing packets. 586 */ 587 static struct mbuf * 588 igmp_ra_alloc(void) 589 { 590 struct mbuf *m; 591 struct ipoption *p; 592 593 m = m_get(M_WAITOK, MT_DATA); 594 p = mtod(m, struct ipoption *); 595 p->ipopt_dst.s_addr = INADDR_ANY; 596 p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 597 p->ipopt_list[1] = 0x04; /* 4 bytes long */ 598 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 599 p->ipopt_list[3] = 0x00; /* pad byte */ 600 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 601 602 return (m); 603 } 604 605 /* 606 * Attach IGMP when PF_INET is attached to an interface. 607 */ 608 struct igmp_ifsoftc * 609 igmp_domifattach(struct ifnet *ifp) 610 { 611 struct igmp_ifsoftc *igi; 612 613 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 614 __func__, ifp, ifp->if_xname); 615 616 IGMP_LOCK(); 617 618 igi = igi_alloc_locked(ifp); 619 if (!(ifp->if_flags & IFF_MULTICAST)) 620 igi->igi_flags |= IGIF_SILENT; 621 622 IGMP_UNLOCK(); 623 624 return (igi); 625 } 626 627 /* 628 * VIMAGE: assume curvnet set by caller. 629 */ 630 static struct igmp_ifsoftc * 631 igi_alloc_locked(/*const*/ struct ifnet *ifp) 632 { 633 struct igmp_ifsoftc *igi; 634 635 IGMP_LOCK_ASSERT(); 636 637 igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 638 if (igi == NULL) 639 goto out; 640 641 igi->igi_ifp = ifp; 642 igi->igi_version = V_igmp_default_version; 643 igi->igi_flags = 0; 644 igi->igi_rv = IGMP_RV_INIT; 645 igi->igi_qi = IGMP_QI_INIT; 646 igi->igi_qri = IGMP_QRI_INIT; 647 igi->igi_uri = IGMP_URI_INIT; 648 mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 649 650 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 651 652 CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 653 ifp, ifp->if_xname); 654 655 out: 656 return (igi); 657 } 658 659 /* 660 * Hook for ifdetach. 661 * 662 * NOTE: Some finalization tasks need to run before the protocol domain 663 * is detached, but also before the link layer does its cleanup. 664 * 665 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 666 * XXX This is also bitten by unlocked ifma_protospec access. 667 */ 668 void 669 igmp_ifdetach(struct ifnet *ifp) 670 { 671 struct igmp_ifsoftc *igi; 672 struct ifmultiaddr *ifma, *next; 673 struct in_multi *inm; 674 struct in_multi_head inm_free_tmp; 675 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 676 ifp->if_xname); 677 678 SLIST_INIT(&inm_free_tmp); 679 IGMP_LOCK(); 680 681 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 682 if (igi->igi_version == IGMP_VERSION_3) { 683 IF_ADDR_WLOCK(ifp); 684 restart: 685 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 686 if (ifma->ifma_addr->sa_family != AF_INET || 687 ifma->ifma_protospec == NULL) 688 continue; 689 inm = (struct in_multi *)ifma->ifma_protospec; 690 if (inm->inm_state == IGMP_LEAVING_MEMBER) 691 inm_rele_locked(&inm_free_tmp, inm); 692 inm_clear_recorded(inm); 693 if (__predict_false(ifma_restart)) { 694 ifma_restart = false; 695 goto restart; 696 } 697 } 698 IF_ADDR_WUNLOCK(ifp); 699 inm_release_list_deferred(&inm_free_tmp); 700 } 701 IGMP_UNLOCK(); 702 703 } 704 705 /* 706 * Hook for domifdetach. 707 */ 708 void 709 igmp_domifdetach(struct ifnet *ifp) 710 { 711 712 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 713 __func__, ifp, ifp->if_xname); 714 715 IGMP_LOCK(); 716 igi_delete_locked(ifp); 717 IGMP_UNLOCK(); 718 } 719 720 static void 721 igi_delete_locked(const struct ifnet *ifp) 722 { 723 struct igmp_ifsoftc *igi, *tigi; 724 725 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 726 __func__, ifp, ifp->if_xname); 727 728 IGMP_LOCK_ASSERT(); 729 730 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 731 if (igi->igi_ifp == ifp) { 732 /* 733 * Free deferred General Query responses. 734 */ 735 mbufq_drain(&igi->igi_gq); 736 737 LIST_REMOVE(igi, igi_link); 738 free(igi, M_IGMP); 739 return; 740 } 741 } 742 } 743 744 /* 745 * Process a received IGMPv1 query. 746 * Return non-zero if the message should be dropped. 747 * 748 * VIMAGE: The curvnet pointer is derived from the input ifp. 749 */ 750 static int 751 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 752 const struct igmp *igmp) 753 { 754 struct ifmultiaddr *ifma; 755 struct igmp_ifsoftc *igi; 756 struct in_multi *inm; 757 758 NET_EPOCH_ASSERT(); 759 760 /* 761 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 762 * 224.0.0.1. They are always treated as General Queries. 763 * igmp_group is always ignored. Do not drop it as a userland 764 * daemon may wish to see it. 765 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 766 */ 767 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 768 IGMPSTAT_INC(igps_rcv_badqueries); 769 return (0); 770 } 771 IGMPSTAT_INC(igps_rcv_gen_queries); 772 773 IN_MULTI_LIST_LOCK(); 774 IGMP_LOCK(); 775 776 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 777 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 778 779 if (igi->igi_flags & IGIF_LOOPBACK) { 780 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 781 ifp, ifp->if_xname); 782 goto out_locked; 783 } 784 785 /* 786 * Switch to IGMPv1 host compatibility mode. 787 */ 788 igmp_set_version(igi, IGMP_VERSION_1); 789 790 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 791 792 /* 793 * Start the timers in all of our group records 794 * for the interface on which the query arrived, 795 * except those which are already running. 796 */ 797 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 798 if (ifma->ifma_addr->sa_family != AF_INET || 799 ifma->ifma_protospec == NULL) 800 continue; 801 inm = (struct in_multi *)ifma->ifma_protospec; 802 if (inm->inm_timer != 0) 803 continue; 804 switch (inm->inm_state) { 805 case IGMP_NOT_MEMBER: 806 case IGMP_SILENT_MEMBER: 807 break; 808 case IGMP_G_QUERY_PENDING_MEMBER: 809 case IGMP_SG_QUERY_PENDING_MEMBER: 810 case IGMP_REPORTING_MEMBER: 811 case IGMP_IDLE_MEMBER: 812 case IGMP_LAZY_MEMBER: 813 case IGMP_SLEEPING_MEMBER: 814 case IGMP_AWAKENING_MEMBER: 815 inm->inm_state = IGMP_REPORTING_MEMBER; 816 inm->inm_timer = IGMP_RANDOM_DELAY( 817 IGMP_V1V2_MAX_RI * PR_FASTHZ); 818 V_current_state_timers_running = 1; 819 break; 820 case IGMP_LEAVING_MEMBER: 821 break; 822 } 823 } 824 825 out_locked: 826 IGMP_UNLOCK(); 827 IN_MULTI_LIST_UNLOCK(); 828 829 return (0); 830 } 831 832 /* 833 * Process a received IGMPv2 general or group-specific query. 834 */ 835 static int 836 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 837 const struct igmp *igmp) 838 { 839 struct ifmultiaddr *ifma; 840 struct igmp_ifsoftc *igi; 841 struct in_multi *inm; 842 int is_general_query; 843 uint16_t timer; 844 845 NET_EPOCH_ASSERT(); 846 847 is_general_query = 0; 848 849 /* 850 * Validate address fields upfront. 851 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 852 */ 853 if (in_nullhost(igmp->igmp_group)) { 854 /* 855 * IGMPv2 General Query. 856 * If this was not sent to the all-hosts group, ignore it. 857 */ 858 if (!in_allhosts(ip->ip_dst)) 859 return (0); 860 IGMPSTAT_INC(igps_rcv_gen_queries); 861 is_general_query = 1; 862 } else { 863 /* IGMPv2 Group-Specific Query. */ 864 IGMPSTAT_INC(igps_rcv_group_queries); 865 } 866 867 IN_MULTI_LIST_LOCK(); 868 IGMP_LOCK(); 869 870 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 871 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 872 873 if (igi->igi_flags & IGIF_LOOPBACK) { 874 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 875 ifp, ifp->if_xname); 876 goto out_locked; 877 } 878 879 /* 880 * Ignore v2 query if in v1 Compatibility Mode. 881 */ 882 if (igi->igi_version == IGMP_VERSION_1) 883 goto out_locked; 884 885 igmp_set_version(igi, IGMP_VERSION_2); 886 887 timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE; 888 if (timer == 0) 889 timer = 1; 890 891 if (is_general_query) { 892 /* 893 * For each reporting group joined on this 894 * interface, kick the report timer. 895 */ 896 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 897 ifp, ifp->if_xname); 898 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 899 if (ifma->ifma_addr->sa_family != AF_INET || 900 ifma->ifma_protospec == NULL) 901 continue; 902 inm = (struct in_multi *)ifma->ifma_protospec; 903 igmp_v2_update_group(inm, timer); 904 } 905 } else { 906 /* 907 * Group-specific IGMPv2 query, we need only 908 * look up the single group to process it. 909 */ 910 inm = inm_lookup(ifp, igmp->igmp_group); 911 if (inm != NULL) { 912 CTR3(KTR_IGMPV3, 913 "process v2 query 0x%08x on ifp %p(%s)", 914 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 915 igmp_v2_update_group(inm, timer); 916 } 917 } 918 919 out_locked: 920 IGMP_UNLOCK(); 921 IN_MULTI_LIST_UNLOCK(); 922 923 return (0); 924 } 925 926 /* 927 * Update the report timer on a group in response to an IGMPv2 query. 928 * 929 * If we are becoming the reporting member for this group, start the timer. 930 * If we already are the reporting member for this group, and timer is 931 * below the threshold, reset it. 932 * 933 * We may be updating the group for the first time since we switched 934 * to IGMPv3. If we are, then we must clear any recorded source lists, 935 * and transition to REPORTING state; the group timer is overloaded 936 * for group and group-source query responses. 937 * 938 * Unlike IGMPv3, the delay per group should be jittered 939 * to avoid bursts of IGMPv2 reports. 940 */ 941 static void 942 igmp_v2_update_group(struct in_multi *inm, const int timer) 943 { 944 945 CTR4(KTR_IGMPV3, "0x%08x: %s/%s timer=%d", __func__, 946 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname, timer); 947 948 IN_MULTI_LIST_LOCK_ASSERT(); 949 950 switch (inm->inm_state) { 951 case IGMP_NOT_MEMBER: 952 case IGMP_SILENT_MEMBER: 953 break; 954 case IGMP_REPORTING_MEMBER: 955 if (inm->inm_timer != 0 && 956 inm->inm_timer <= timer) { 957 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 958 "skipping.", __func__); 959 break; 960 } 961 /* FALLTHROUGH */ 962 case IGMP_SG_QUERY_PENDING_MEMBER: 963 case IGMP_G_QUERY_PENDING_MEMBER: 964 case IGMP_IDLE_MEMBER: 965 case IGMP_LAZY_MEMBER: 966 case IGMP_AWAKENING_MEMBER: 967 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 968 inm->inm_state = IGMP_REPORTING_MEMBER; 969 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 970 V_current_state_timers_running = 1; 971 break; 972 case IGMP_SLEEPING_MEMBER: 973 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 974 inm->inm_state = IGMP_AWAKENING_MEMBER; 975 break; 976 case IGMP_LEAVING_MEMBER: 977 break; 978 } 979 } 980 981 /* 982 * Process a received IGMPv3 general, group-specific or 983 * group-and-source-specific query. 984 * Assumes m has already been pulled up to the full IGMP message length. 985 * Return 0 if successful, otherwise an appropriate error code is returned. 986 */ 987 static int 988 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 989 /*const*/ struct igmpv3 *igmpv3) 990 { 991 struct igmp_ifsoftc *igi; 992 struct in_multi *inm; 993 int is_general_query; 994 uint32_t maxresp, nsrc, qqi; 995 uint16_t timer; 996 uint8_t qrv; 997 998 is_general_query = 0; 999 1000 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 1001 1002 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 1003 if (maxresp >= 128) { 1004 maxresp = IGMP_MANT(igmpv3->igmp_code) << 1005 (IGMP_EXP(igmpv3->igmp_code) + 3); 1006 } 1007 1008 /* 1009 * Robustness must never be less than 2 for on-wire IGMPv3. 1010 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 1011 * an exception for interfaces whose IGMPv3 state changes 1012 * are redirected to loopback (e.g. MANET). 1013 */ 1014 qrv = IGMP_QRV(igmpv3->igmp_misc); 1015 if (qrv < 2) { 1016 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 1017 qrv, IGMP_RV_INIT); 1018 qrv = IGMP_RV_INIT; 1019 } 1020 1021 qqi = igmpv3->igmp_qqi; 1022 if (qqi >= 128) { 1023 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 1024 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 1025 } 1026 1027 timer = maxresp * PR_FASTHZ / IGMP_TIMER_SCALE; 1028 if (timer == 0) 1029 timer = 1; 1030 1031 nsrc = ntohs(igmpv3->igmp_numsrc); 1032 1033 /* 1034 * Validate address fields and versions upfront before 1035 * accepting v3 query. 1036 * XXX SMPng: Unlocked access to igmpstat counters here. 1037 */ 1038 if (in_nullhost(igmpv3->igmp_group)) { 1039 /* 1040 * IGMPv3 General Query. 1041 * 1042 * General Queries SHOULD be directed to 224.0.0.1. 1043 * A general query with a source list has undefined 1044 * behaviour; discard it. 1045 */ 1046 IGMPSTAT_INC(igps_rcv_gen_queries); 1047 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1048 IGMPSTAT_INC(igps_rcv_badqueries); 1049 return (0); 1050 } 1051 is_general_query = 1; 1052 } else { 1053 /* Group or group-source specific query. */ 1054 if (nsrc == 0) 1055 IGMPSTAT_INC(igps_rcv_group_queries); 1056 else 1057 IGMPSTAT_INC(igps_rcv_gsr_queries); 1058 } 1059 1060 IN_MULTI_LIST_LOCK(); 1061 IGMP_LOCK(); 1062 1063 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1064 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1065 1066 if (igi->igi_flags & IGIF_LOOPBACK) { 1067 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1068 ifp, ifp->if_xname); 1069 goto out_locked; 1070 } 1071 1072 /* 1073 * Discard the v3 query if we're in Compatibility Mode. 1074 * The RFC is not obviously worded that hosts need to stay in 1075 * compatibility mode until the Old Version Querier Present 1076 * timer expires. 1077 */ 1078 if (igi->igi_version != IGMP_VERSION_3) { 1079 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1080 igi->igi_version, ifp, ifp->if_xname); 1081 goto out_locked; 1082 } 1083 1084 igmp_set_version(igi, IGMP_VERSION_3); 1085 igi->igi_rv = qrv; 1086 igi->igi_qi = qqi; 1087 igi->igi_qri = maxresp; 1088 1089 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1090 maxresp); 1091 1092 if (is_general_query) { 1093 /* 1094 * Schedule a current-state report on this ifp for 1095 * all groups, possibly containing source lists. 1096 * If there is a pending General Query response 1097 * scheduled earlier than the selected delay, do 1098 * not schedule any other reports. 1099 * Otherwise, reset the interface timer. 1100 */ 1101 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1102 ifp, ifp->if_xname); 1103 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1104 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1105 V_interface_timers_running = 1; 1106 } 1107 } else { 1108 /* 1109 * Group-source-specific queries are throttled on 1110 * a per-group basis to defeat denial-of-service attempts. 1111 * Queries for groups we are not a member of on this 1112 * link are simply ignored. 1113 */ 1114 inm = inm_lookup(ifp, igmpv3->igmp_group); 1115 if (inm == NULL) 1116 goto out_locked; 1117 if (nsrc > 0) { 1118 if (!ratecheck(&inm->inm_lastgsrtv, 1119 &V_igmp_gsrdelay)) { 1120 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1121 __func__); 1122 IGMPSTAT_INC(igps_drop_gsr_queries); 1123 goto out_locked; 1124 } 1125 } 1126 CTR3(KTR_IGMPV3, "process v3 0x%08x query on ifp %p(%s)", 1127 ntohl(igmpv3->igmp_group.s_addr), ifp, ifp->if_xname); 1128 /* 1129 * If there is a pending General Query response 1130 * scheduled sooner than the selected delay, no 1131 * further report need be scheduled. 1132 * Otherwise, prepare to respond to the 1133 * group-specific or group-and-source query. 1134 */ 1135 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1136 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1137 } 1138 1139 out_locked: 1140 IGMP_UNLOCK(); 1141 IN_MULTI_LIST_UNLOCK(); 1142 1143 return (0); 1144 } 1145 1146 /* 1147 * Process a received IGMPv3 group-specific or group-and-source-specific 1148 * query. 1149 * Return <0 if any error occurred. Currently this is ignored. 1150 */ 1151 static int 1152 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1153 int timer, /*const*/ struct igmpv3 *igmpv3) 1154 { 1155 int retval; 1156 uint16_t nsrc; 1157 1158 IN_MULTI_LIST_LOCK_ASSERT(); 1159 IGMP_LOCK_ASSERT(); 1160 1161 retval = 0; 1162 1163 switch (inm->inm_state) { 1164 case IGMP_NOT_MEMBER: 1165 case IGMP_SILENT_MEMBER: 1166 case IGMP_SLEEPING_MEMBER: 1167 case IGMP_LAZY_MEMBER: 1168 case IGMP_AWAKENING_MEMBER: 1169 case IGMP_IDLE_MEMBER: 1170 case IGMP_LEAVING_MEMBER: 1171 return (retval); 1172 break; 1173 case IGMP_REPORTING_MEMBER: 1174 case IGMP_G_QUERY_PENDING_MEMBER: 1175 case IGMP_SG_QUERY_PENDING_MEMBER: 1176 break; 1177 } 1178 1179 nsrc = ntohs(igmpv3->igmp_numsrc); 1180 1181 /* 1182 * Deal with group-specific queries upfront. 1183 * If any group query is already pending, purge any recorded 1184 * source-list state if it exists, and schedule a query response 1185 * for this group-specific query. 1186 */ 1187 if (nsrc == 0) { 1188 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1189 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1190 inm_clear_recorded(inm); 1191 timer = min(inm->inm_timer, timer); 1192 } 1193 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1194 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1195 V_current_state_timers_running = 1; 1196 return (retval); 1197 } 1198 1199 /* 1200 * Deal with the case where a group-and-source-specific query has 1201 * been received but a group-specific query is already pending. 1202 */ 1203 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1204 timer = min(inm->inm_timer, timer); 1205 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1206 V_current_state_timers_running = 1; 1207 return (retval); 1208 } 1209 1210 /* 1211 * Finally, deal with the case where a group-and-source-specific 1212 * query has been received, where a response to a previous g-s-r 1213 * query exists, or none exists. 1214 * In this case, we need to parse the source-list which the Querier 1215 * has provided us with and check if we have any source list filter 1216 * entries at T1 for these sources. If we do not, there is no need 1217 * schedule a report and the query may be dropped. 1218 * If we do, we must record them and schedule a current-state 1219 * report for those sources. 1220 * FIXME: Handling source lists larger than 1 mbuf requires that 1221 * we pass the mbuf chain pointer down to this function, and use 1222 * m_getptr() to walk the chain. 1223 */ 1224 if (inm->inm_nsrc > 0) { 1225 const struct in_addr *ap; 1226 int i, nrecorded; 1227 1228 ap = (const struct in_addr *)(igmpv3 + 1); 1229 nrecorded = 0; 1230 for (i = 0; i < nsrc; i++, ap++) { 1231 retval = inm_record_source(inm, ap->s_addr); 1232 if (retval < 0) 1233 break; 1234 nrecorded += retval; 1235 } 1236 if (nrecorded > 0) { 1237 CTR1(KTR_IGMPV3, 1238 "%s: schedule response to SG query", __func__); 1239 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1240 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1241 V_current_state_timers_running = 1; 1242 } 1243 } 1244 1245 return (retval); 1246 } 1247 1248 /* 1249 * Process a received IGMPv1 host membership report. 1250 * 1251 * NOTE: 0.0.0.0 workaround breaks const correctness. 1252 */ 1253 static int 1254 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1255 /*const*/ struct igmp *igmp) 1256 { 1257 struct rm_priotracker in_ifa_tracker; 1258 struct in_ifaddr *ia; 1259 struct in_multi *inm; 1260 1261 IGMPSTAT_INC(igps_rcv_reports); 1262 1263 if (ifp->if_flags & IFF_LOOPBACK) 1264 return (0); 1265 1266 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1267 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1268 IGMPSTAT_INC(igps_rcv_badreports); 1269 return (EINVAL); 1270 } 1271 1272 /* 1273 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1274 * Booting clients may use the source address 0.0.0.0. Some 1275 * IGMP daemons may not know how to use IP_RECVIF to determine 1276 * the interface upon which this message was received. 1277 * Replace 0.0.0.0 with the subnet address if told to do so. 1278 */ 1279 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1280 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 1281 if (ia != NULL) 1282 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1283 } 1284 1285 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1286 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1287 1288 /* 1289 * IGMPv1 report suppression. 1290 * If we are a member of this group, and our membership should be 1291 * reported, stop our group timer and transition to the 'lazy' state. 1292 */ 1293 IN_MULTI_LIST_LOCK(); 1294 inm = inm_lookup(ifp, igmp->igmp_group); 1295 if (inm != NULL) { 1296 struct igmp_ifsoftc *igi; 1297 1298 igi = inm->inm_igi; 1299 if (igi == NULL) { 1300 KASSERT(igi != NULL, 1301 ("%s: no igi for ifp %p", __func__, ifp)); 1302 goto out_locked; 1303 } 1304 1305 IGMPSTAT_INC(igps_rcv_ourreports); 1306 1307 /* 1308 * If we are in IGMPv3 host mode, do not allow the 1309 * other host's IGMPv1 report to suppress our reports 1310 * unless explicitly configured to do so. 1311 */ 1312 if (igi->igi_version == IGMP_VERSION_3) { 1313 if (V_igmp_legacysupp) 1314 igmp_v3_suppress_group_record(inm); 1315 goto out_locked; 1316 } 1317 1318 inm->inm_timer = 0; 1319 1320 switch (inm->inm_state) { 1321 case IGMP_NOT_MEMBER: 1322 case IGMP_SILENT_MEMBER: 1323 break; 1324 case IGMP_IDLE_MEMBER: 1325 case IGMP_LAZY_MEMBER: 1326 case IGMP_AWAKENING_MEMBER: 1327 CTR3(KTR_IGMPV3, 1328 "report suppressed for 0x%08x on ifp %p(%s)", 1329 ntohl(igmp->igmp_group.s_addr), ifp, 1330 ifp->if_xname); 1331 case IGMP_SLEEPING_MEMBER: 1332 inm->inm_state = IGMP_SLEEPING_MEMBER; 1333 break; 1334 case IGMP_REPORTING_MEMBER: 1335 CTR3(KTR_IGMPV3, 1336 "report suppressed for 0x%08x on ifp %p(%s)", 1337 ntohl(igmp->igmp_group.s_addr), ifp, 1338 ifp->if_xname); 1339 if (igi->igi_version == IGMP_VERSION_1) 1340 inm->inm_state = IGMP_LAZY_MEMBER; 1341 else if (igi->igi_version == IGMP_VERSION_2) 1342 inm->inm_state = IGMP_SLEEPING_MEMBER; 1343 break; 1344 case IGMP_G_QUERY_PENDING_MEMBER: 1345 case IGMP_SG_QUERY_PENDING_MEMBER: 1346 case IGMP_LEAVING_MEMBER: 1347 break; 1348 } 1349 } 1350 1351 out_locked: 1352 IN_MULTI_LIST_UNLOCK(); 1353 1354 return (0); 1355 } 1356 1357 /* 1358 * Process a received IGMPv2 host membership report. 1359 * 1360 * NOTE: 0.0.0.0 workaround breaks const correctness. 1361 */ 1362 static int 1363 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1364 /*const*/ struct igmp *igmp) 1365 { 1366 struct rm_priotracker in_ifa_tracker; 1367 struct in_ifaddr *ia; 1368 struct in_multi *inm; 1369 1370 /* 1371 * Make sure we don't hear our own membership report. Fast 1372 * leave requires knowing that we are the only member of a 1373 * group. 1374 */ 1375 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 1376 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1377 return (0); 1378 } 1379 1380 IGMPSTAT_INC(igps_rcv_reports); 1381 1382 if (ifp->if_flags & IFF_LOOPBACK) { 1383 return (0); 1384 } 1385 1386 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1387 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1388 IGMPSTAT_INC(igps_rcv_badreports); 1389 return (EINVAL); 1390 } 1391 1392 /* 1393 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1394 * Booting clients may use the source address 0.0.0.0. Some 1395 * IGMP daemons may not know how to use IP_RECVIF to determine 1396 * the interface upon which this message was received. 1397 * Replace 0.0.0.0 with the subnet address if told to do so. 1398 */ 1399 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1400 if (ia != NULL) 1401 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1402 } 1403 1404 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1405 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1406 1407 /* 1408 * IGMPv2 report suppression. 1409 * If we are a member of this group, and our membership should be 1410 * reported, and our group timer is pending or about to be reset, 1411 * stop our group timer by transitioning to the 'lazy' state. 1412 */ 1413 IN_MULTI_LIST_LOCK(); 1414 inm = inm_lookup(ifp, igmp->igmp_group); 1415 if (inm != NULL) { 1416 struct igmp_ifsoftc *igi; 1417 1418 igi = inm->inm_igi; 1419 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1420 1421 IGMPSTAT_INC(igps_rcv_ourreports); 1422 1423 /* 1424 * If we are in IGMPv3 host mode, do not allow the 1425 * other host's IGMPv1 report to suppress our reports 1426 * unless explicitly configured to do so. 1427 */ 1428 if (igi->igi_version == IGMP_VERSION_3) { 1429 if (V_igmp_legacysupp) 1430 igmp_v3_suppress_group_record(inm); 1431 goto out_locked; 1432 } 1433 1434 inm->inm_timer = 0; 1435 1436 switch (inm->inm_state) { 1437 case IGMP_NOT_MEMBER: 1438 case IGMP_SILENT_MEMBER: 1439 case IGMP_SLEEPING_MEMBER: 1440 break; 1441 case IGMP_REPORTING_MEMBER: 1442 case IGMP_IDLE_MEMBER: 1443 case IGMP_AWAKENING_MEMBER: 1444 CTR3(KTR_IGMPV3, 1445 "report suppressed for 0x%08x on ifp %p(%s)", 1446 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1447 case IGMP_LAZY_MEMBER: 1448 inm->inm_state = IGMP_LAZY_MEMBER; 1449 break; 1450 case IGMP_G_QUERY_PENDING_MEMBER: 1451 case IGMP_SG_QUERY_PENDING_MEMBER: 1452 case IGMP_LEAVING_MEMBER: 1453 break; 1454 } 1455 } 1456 1457 out_locked: 1458 IN_MULTI_LIST_UNLOCK(); 1459 1460 return (0); 1461 } 1462 1463 int 1464 igmp_input(struct mbuf **mp, int *offp, int proto) 1465 { 1466 int iphlen; 1467 struct ifnet *ifp; 1468 struct igmp *igmp; 1469 struct ip *ip; 1470 struct mbuf *m; 1471 int igmplen; 1472 int minlen; 1473 int queryver; 1474 1475 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1476 1477 m = *mp; 1478 ifp = m->m_pkthdr.rcvif; 1479 *mp = NULL; 1480 1481 IGMPSTAT_INC(igps_rcv_total); 1482 1483 ip = mtod(m, struct ip *); 1484 iphlen = *offp; 1485 igmplen = ntohs(ip->ip_len) - iphlen; 1486 1487 /* 1488 * Validate lengths. 1489 */ 1490 if (igmplen < IGMP_MINLEN) { 1491 IGMPSTAT_INC(igps_rcv_tooshort); 1492 m_freem(m); 1493 return (IPPROTO_DONE); 1494 } 1495 1496 /* 1497 * Always pullup to the minimum size for v1/v2 or v3 1498 * to amortize calls to m_pullup(). 1499 */ 1500 minlen = iphlen; 1501 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1502 minlen += IGMP_V3_QUERY_MINLEN; 1503 else 1504 minlen += IGMP_MINLEN; 1505 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1506 (m = m_pullup(m, minlen)) == NULL) { 1507 IGMPSTAT_INC(igps_rcv_tooshort); 1508 return (IPPROTO_DONE); 1509 } 1510 ip = mtod(m, struct ip *); 1511 1512 /* 1513 * Validate checksum. 1514 */ 1515 m->m_data += iphlen; 1516 m->m_len -= iphlen; 1517 igmp = mtod(m, struct igmp *); 1518 if (in_cksum(m, igmplen)) { 1519 IGMPSTAT_INC(igps_rcv_badsum); 1520 m_freem(m); 1521 return (IPPROTO_DONE); 1522 } 1523 m->m_data -= iphlen; 1524 m->m_len += iphlen; 1525 1526 /* 1527 * IGMP control traffic is link-scope, and must have a TTL of 1. 1528 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1529 * probe packets may come from beyond the LAN. 1530 */ 1531 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1532 IGMPSTAT_INC(igps_rcv_badttl); 1533 m_freem(m); 1534 return (IPPROTO_DONE); 1535 } 1536 1537 switch (igmp->igmp_type) { 1538 case IGMP_HOST_MEMBERSHIP_QUERY: 1539 if (igmplen == IGMP_MINLEN) { 1540 if (igmp->igmp_code == 0) 1541 queryver = IGMP_VERSION_1; 1542 else 1543 queryver = IGMP_VERSION_2; 1544 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1545 queryver = IGMP_VERSION_3; 1546 } else { 1547 IGMPSTAT_INC(igps_rcv_tooshort); 1548 m_freem(m); 1549 return (IPPROTO_DONE); 1550 } 1551 1552 switch (queryver) { 1553 case IGMP_VERSION_1: 1554 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1555 if (!V_igmp_v1enable) 1556 break; 1557 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1558 m_freem(m); 1559 return (IPPROTO_DONE); 1560 } 1561 break; 1562 1563 case IGMP_VERSION_2: 1564 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1565 if (!V_igmp_v2enable) 1566 break; 1567 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1568 m_freem(m); 1569 return (IPPROTO_DONE); 1570 } 1571 break; 1572 1573 case IGMP_VERSION_3: { 1574 struct igmpv3 *igmpv3; 1575 uint16_t igmpv3len; 1576 uint16_t nsrc; 1577 1578 IGMPSTAT_INC(igps_rcv_v3_queries); 1579 igmpv3 = (struct igmpv3 *)igmp; 1580 /* 1581 * Validate length based on source count. 1582 */ 1583 nsrc = ntohs(igmpv3->igmp_numsrc); 1584 if (nsrc * sizeof(in_addr_t) > 1585 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1586 IGMPSTAT_INC(igps_rcv_tooshort); 1587 return (IPPROTO_DONE); 1588 } 1589 /* 1590 * m_pullup() may modify m, so pullup in 1591 * this scope. 1592 */ 1593 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1594 sizeof(struct in_addr) * nsrc; 1595 if ((!M_WRITABLE(m) || 1596 m->m_len < igmpv3len) && 1597 (m = m_pullup(m, igmpv3len)) == NULL) { 1598 IGMPSTAT_INC(igps_rcv_tooshort); 1599 return (IPPROTO_DONE); 1600 } 1601 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1602 + iphlen); 1603 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1604 m_freem(m); 1605 return (IPPROTO_DONE); 1606 } 1607 } 1608 break; 1609 } 1610 break; 1611 1612 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1613 if (!V_igmp_v1enable) 1614 break; 1615 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1616 m_freem(m); 1617 return (IPPROTO_DONE); 1618 } 1619 break; 1620 1621 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1622 if (!V_igmp_v2enable) 1623 break; 1624 if (!ip_checkrouteralert(m)) 1625 IGMPSTAT_INC(igps_rcv_nora); 1626 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1627 m_freem(m); 1628 return (IPPROTO_DONE); 1629 } 1630 break; 1631 1632 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1633 /* 1634 * Hosts do not need to process IGMPv3 membership reports, 1635 * as report suppression is no longer required. 1636 */ 1637 if (!ip_checkrouteralert(m)) 1638 IGMPSTAT_INC(igps_rcv_nora); 1639 break; 1640 1641 default: 1642 break; 1643 } 1644 1645 /* 1646 * Pass all valid IGMP packets up to any process(es) listening on a 1647 * raw IGMP socket. 1648 */ 1649 *mp = m; 1650 return (rip_input(mp, offp, proto)); 1651 } 1652 1653 1654 /* 1655 * Fast timeout handler (global). 1656 * VIMAGE: Timeout handlers are expected to service all vimages. 1657 */ 1658 void 1659 igmp_fasttimo(void) 1660 { 1661 VNET_ITERATOR_DECL(vnet_iter); 1662 1663 VNET_LIST_RLOCK_NOSLEEP(); 1664 VNET_FOREACH(vnet_iter) { 1665 CURVNET_SET(vnet_iter); 1666 igmp_fasttimo_vnet(); 1667 CURVNET_RESTORE(); 1668 } 1669 VNET_LIST_RUNLOCK_NOSLEEP(); 1670 } 1671 1672 /* 1673 * Fast timeout handler (per-vnet). 1674 * Sends are shuffled off to a netisr to deal with Giant. 1675 * 1676 * VIMAGE: Assume caller has set up our curvnet. 1677 */ 1678 static void 1679 igmp_fasttimo_vnet(void) 1680 { 1681 struct mbufq scq; /* State-change packets */ 1682 struct mbufq qrq; /* Query response packets */ 1683 struct ifnet *ifp; 1684 struct igmp_ifsoftc *igi; 1685 struct ifmultiaddr *ifma, *next; 1686 struct in_multi *inm; 1687 struct in_multi_head inm_free_tmp; 1688 int loop, uri_fasthz; 1689 1690 loop = 0; 1691 uri_fasthz = 0; 1692 1693 /* 1694 * Quick check to see if any work needs to be done, in order to 1695 * minimize the overhead of fasttimo processing. 1696 * SMPng: XXX Unlocked reads. 1697 */ 1698 if (!V_current_state_timers_running && 1699 !V_interface_timers_running && 1700 !V_state_change_timers_running) 1701 return; 1702 1703 SLIST_INIT(&inm_free_tmp); 1704 IN_MULTI_LIST_LOCK(); 1705 IGMP_LOCK(); 1706 1707 /* 1708 * IGMPv3 General Query response timer processing. 1709 */ 1710 if (V_interface_timers_running) { 1711 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1712 1713 V_interface_timers_running = 0; 1714 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1715 if (igi->igi_v3_timer == 0) { 1716 /* Do nothing. */ 1717 } else if (--igi->igi_v3_timer == 0) { 1718 igmp_v3_dispatch_general_query(igi); 1719 } else { 1720 V_interface_timers_running = 1; 1721 } 1722 } 1723 } 1724 1725 if (!V_current_state_timers_running && 1726 !V_state_change_timers_running) 1727 goto out_locked; 1728 1729 V_current_state_timers_running = 0; 1730 V_state_change_timers_running = 0; 1731 1732 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1733 1734 /* 1735 * IGMPv1/v2/v3 host report and state-change timer processing. 1736 * Note: Processing a v3 group timer may remove a node. 1737 */ 1738 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1739 ifp = igi->igi_ifp; 1740 1741 if (igi->igi_version == IGMP_VERSION_3) { 1742 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1743 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1744 PR_FASTHZ); 1745 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1746 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1747 } 1748 1749 IF_ADDR_WLOCK(ifp); 1750 restart: 1751 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 1752 if (ifma->ifma_addr->sa_family != AF_INET || 1753 ifma->ifma_protospec == NULL) 1754 continue; 1755 inm = (struct in_multi *)ifma->ifma_protospec; 1756 switch (igi->igi_version) { 1757 case IGMP_VERSION_1: 1758 case IGMP_VERSION_2: 1759 igmp_v1v2_process_group_timer(inm, 1760 igi->igi_version); 1761 break; 1762 case IGMP_VERSION_3: 1763 igmp_v3_process_group_timers(&inm_free_tmp, &qrq, 1764 &scq, inm, uri_fasthz); 1765 break; 1766 } 1767 if (__predict_false(ifma_restart)) { 1768 ifma_restart = false; 1769 goto restart; 1770 } 1771 } 1772 IF_ADDR_WUNLOCK(ifp); 1773 1774 if (igi->igi_version == IGMP_VERSION_3) { 1775 igmp_dispatch_queue(&qrq, 0, loop); 1776 igmp_dispatch_queue(&scq, 0, loop); 1777 1778 /* 1779 * Free the in_multi reference(s) for this 1780 * IGMP lifecycle. 1781 */ 1782 inm_release_list_deferred(&inm_free_tmp); 1783 } 1784 } 1785 1786 out_locked: 1787 IGMP_UNLOCK(); 1788 IN_MULTI_LIST_UNLOCK(); 1789 } 1790 1791 /* 1792 * Update host report group timer for IGMPv1/v2. 1793 * Will update the global pending timer flags. 1794 */ 1795 static void 1796 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1797 { 1798 int report_timer_expired; 1799 1800 IN_MULTI_LIST_LOCK_ASSERT(); 1801 IGMP_LOCK_ASSERT(); 1802 1803 if (inm->inm_timer == 0) { 1804 report_timer_expired = 0; 1805 } else if (--inm->inm_timer == 0) { 1806 report_timer_expired = 1; 1807 } else { 1808 V_current_state_timers_running = 1; 1809 return; 1810 } 1811 1812 switch (inm->inm_state) { 1813 case IGMP_NOT_MEMBER: 1814 case IGMP_SILENT_MEMBER: 1815 case IGMP_IDLE_MEMBER: 1816 case IGMP_LAZY_MEMBER: 1817 case IGMP_SLEEPING_MEMBER: 1818 case IGMP_AWAKENING_MEMBER: 1819 break; 1820 case IGMP_REPORTING_MEMBER: 1821 if (report_timer_expired) { 1822 inm->inm_state = IGMP_IDLE_MEMBER; 1823 (void)igmp_v1v2_queue_report(inm, 1824 (version == IGMP_VERSION_2) ? 1825 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1826 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1827 } 1828 break; 1829 case IGMP_G_QUERY_PENDING_MEMBER: 1830 case IGMP_SG_QUERY_PENDING_MEMBER: 1831 case IGMP_LEAVING_MEMBER: 1832 break; 1833 } 1834 } 1835 1836 /* 1837 * Update a group's timers for IGMPv3. 1838 * Will update the global pending timer flags. 1839 * Note: Unlocked read from igi. 1840 */ 1841 static void 1842 igmp_v3_process_group_timers(struct in_multi_head *inmh, 1843 struct mbufq *qrq, struct mbufq *scq, 1844 struct in_multi *inm, const int uri_fasthz) 1845 { 1846 int query_response_timer_expired; 1847 int state_change_retransmit_timer_expired; 1848 1849 IN_MULTI_LIST_LOCK_ASSERT(); 1850 IGMP_LOCK_ASSERT(); 1851 1852 query_response_timer_expired = 0; 1853 state_change_retransmit_timer_expired = 0; 1854 1855 /* 1856 * During a transition from v1/v2 compatibility mode back to v3, 1857 * a group record in REPORTING state may still have its group 1858 * timer active. This is a no-op in this function; it is easier 1859 * to deal with it here than to complicate the slow-timeout path. 1860 */ 1861 if (inm->inm_timer == 0) { 1862 query_response_timer_expired = 0; 1863 } else if (--inm->inm_timer == 0) { 1864 query_response_timer_expired = 1; 1865 } else { 1866 V_current_state_timers_running = 1; 1867 } 1868 1869 if (inm->inm_sctimer == 0) { 1870 state_change_retransmit_timer_expired = 0; 1871 } else if (--inm->inm_sctimer == 0) { 1872 state_change_retransmit_timer_expired = 1; 1873 } else { 1874 V_state_change_timers_running = 1; 1875 } 1876 1877 /* We are in fasttimo, so be quick about it. */ 1878 if (!state_change_retransmit_timer_expired && 1879 !query_response_timer_expired) 1880 return; 1881 1882 switch (inm->inm_state) { 1883 case IGMP_NOT_MEMBER: 1884 case IGMP_SILENT_MEMBER: 1885 case IGMP_SLEEPING_MEMBER: 1886 case IGMP_LAZY_MEMBER: 1887 case IGMP_AWAKENING_MEMBER: 1888 case IGMP_IDLE_MEMBER: 1889 break; 1890 case IGMP_G_QUERY_PENDING_MEMBER: 1891 case IGMP_SG_QUERY_PENDING_MEMBER: 1892 /* 1893 * Respond to a previously pending Group-Specific 1894 * or Group-and-Source-Specific query by enqueueing 1895 * the appropriate Current-State report for 1896 * immediate transmission. 1897 */ 1898 if (query_response_timer_expired) { 1899 int retval __unused; 1900 1901 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1902 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1903 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1904 __func__, retval); 1905 inm->inm_state = IGMP_REPORTING_MEMBER; 1906 /* XXX Clear recorded sources for next time. */ 1907 inm_clear_recorded(inm); 1908 } 1909 /* FALLTHROUGH */ 1910 case IGMP_REPORTING_MEMBER: 1911 case IGMP_LEAVING_MEMBER: 1912 if (state_change_retransmit_timer_expired) { 1913 /* 1914 * State-change retransmission timer fired. 1915 * If there are any further pending retransmissions, 1916 * set the global pending state-change flag, and 1917 * reset the timer. 1918 */ 1919 if (--inm->inm_scrv > 0) { 1920 inm->inm_sctimer = uri_fasthz; 1921 V_state_change_timers_running = 1; 1922 } 1923 /* 1924 * Retransmit the previously computed state-change 1925 * report. If there are no further pending 1926 * retransmissions, the mbuf queue will be consumed. 1927 * Update T0 state to T1 as we have now sent 1928 * a state-change. 1929 */ 1930 (void)igmp_v3_merge_state_changes(inm, scq); 1931 1932 inm_commit(inm); 1933 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1934 ntohl(inm->inm_addr.s_addr), 1935 inm->inm_ifp->if_xname); 1936 1937 /* 1938 * If we are leaving the group for good, make sure 1939 * we release IGMP's reference to it. 1940 * This release must be deferred using a SLIST, 1941 * as we are called from a loop which traverses 1942 * the in_ifmultiaddr TAILQ. 1943 */ 1944 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1945 inm->inm_scrv == 0) { 1946 inm->inm_state = IGMP_NOT_MEMBER; 1947 inm_rele_locked(inmh, inm); 1948 } 1949 } 1950 break; 1951 } 1952 } 1953 1954 1955 /* 1956 * Suppress a group's pending response to a group or source/group query. 1957 * 1958 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1959 * Do NOT update ST1/ST0 as this operation merely suppresses 1960 * the currently pending group record. 1961 * Do NOT suppress the response to a general query. It is possible but 1962 * it would require adding another state or flag. 1963 */ 1964 static void 1965 igmp_v3_suppress_group_record(struct in_multi *inm) 1966 { 1967 1968 IN_MULTI_LIST_LOCK_ASSERT(); 1969 1970 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1971 ("%s: not IGMPv3 mode on link", __func__)); 1972 1973 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1974 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1975 return; 1976 1977 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1978 inm_clear_recorded(inm); 1979 1980 inm->inm_timer = 0; 1981 inm->inm_state = IGMP_REPORTING_MEMBER; 1982 } 1983 1984 /* 1985 * Switch to a different IGMP version on the given interface, 1986 * as per Section 7.2.1. 1987 */ 1988 static void 1989 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1990 { 1991 int old_version_timer; 1992 1993 IGMP_LOCK_ASSERT(); 1994 1995 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 1996 version, igi->igi_ifp, igi->igi_ifp->if_xname); 1997 1998 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 1999 /* 2000 * Compute the "Older Version Querier Present" timer as per 2001 * Section 8.12. 2002 */ 2003 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 2004 old_version_timer *= PR_SLOWHZ; 2005 2006 if (version == IGMP_VERSION_1) { 2007 igi->igi_v1_timer = old_version_timer; 2008 igi->igi_v2_timer = 0; 2009 } else if (version == IGMP_VERSION_2) { 2010 igi->igi_v1_timer = 0; 2011 igi->igi_v2_timer = old_version_timer; 2012 } 2013 } 2014 2015 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2016 if (igi->igi_version != IGMP_VERSION_2) { 2017 igi->igi_version = IGMP_VERSION_2; 2018 igmp_v3_cancel_link_timers(igi); 2019 } 2020 } else if (igi->igi_v1_timer > 0) { 2021 if (igi->igi_version != IGMP_VERSION_1) { 2022 igi->igi_version = IGMP_VERSION_1; 2023 igmp_v3_cancel_link_timers(igi); 2024 } 2025 } 2026 } 2027 2028 /* 2029 * Cancel pending IGMPv3 timers for the given link and all groups 2030 * joined on it; state-change, general-query, and group-query timers. 2031 * 2032 * Only ever called on a transition from v3 to Compatibility mode. Kill 2033 * the timers stone dead (this may be expensive for large N groups), they 2034 * will be restarted if Compatibility Mode deems that they must be due to 2035 * query processing. 2036 */ 2037 static void 2038 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2039 { 2040 struct ifmultiaddr *ifma, *ifmatmp; 2041 struct ifnet *ifp; 2042 struct in_multi *inm; 2043 struct in_multi_head inm_free_tmp; 2044 2045 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2046 igi->igi_ifp, igi->igi_ifp->if_xname); 2047 2048 IN_MULTI_LIST_LOCK_ASSERT(); 2049 IGMP_LOCK_ASSERT(); 2050 NET_EPOCH_ASSERT(); 2051 2052 SLIST_INIT(&inm_free_tmp); 2053 2054 /* 2055 * Stop the v3 General Query Response on this link stone dead. 2056 * If fasttimo is woken up due to V_interface_timers_running, 2057 * the flag will be cleared if there are no pending link timers. 2058 */ 2059 igi->igi_v3_timer = 0; 2060 2061 /* 2062 * Now clear the current-state and state-change report timers 2063 * for all memberships scoped to this link. 2064 */ 2065 ifp = igi->igi_ifp; 2066 IF_ADDR_WLOCK(ifp); 2067 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, ifmatmp) { 2068 if (ifma->ifma_addr->sa_family != AF_INET || 2069 ifma->ifma_protospec == NULL) 2070 continue; 2071 inm = (struct in_multi *)ifma->ifma_protospec; 2072 switch (inm->inm_state) { 2073 case IGMP_NOT_MEMBER: 2074 case IGMP_SILENT_MEMBER: 2075 case IGMP_IDLE_MEMBER: 2076 case IGMP_LAZY_MEMBER: 2077 case IGMP_SLEEPING_MEMBER: 2078 case IGMP_AWAKENING_MEMBER: 2079 /* 2080 * These states are either not relevant in v3 mode, 2081 * or are unreported. Do nothing. 2082 */ 2083 break; 2084 case IGMP_LEAVING_MEMBER: 2085 /* 2086 * If we are leaving the group and switching to 2087 * compatibility mode, we need to release the final 2088 * reference held for issuing the INCLUDE {}, and 2089 * transition to REPORTING to ensure the host leave 2090 * message is sent upstream to the old querier -- 2091 * transition to NOT would lose the leave and race. 2092 */ 2093 inm_rele_locked(&inm_free_tmp, inm); 2094 /* FALLTHROUGH */ 2095 case IGMP_G_QUERY_PENDING_MEMBER: 2096 case IGMP_SG_QUERY_PENDING_MEMBER: 2097 inm_clear_recorded(inm); 2098 /* FALLTHROUGH */ 2099 case IGMP_REPORTING_MEMBER: 2100 inm->inm_state = IGMP_REPORTING_MEMBER; 2101 break; 2102 } 2103 /* 2104 * Always clear state-change and group report timers. 2105 * Free any pending IGMPv3 state-change records. 2106 */ 2107 inm->inm_sctimer = 0; 2108 inm->inm_timer = 0; 2109 mbufq_drain(&inm->inm_scq); 2110 } 2111 IF_ADDR_WUNLOCK(ifp); 2112 2113 inm_release_list_deferred(&inm_free_tmp); 2114 } 2115 2116 /* 2117 * Update the Older Version Querier Present timers for a link. 2118 * See Section 7.2.1 of RFC 3376. 2119 */ 2120 static void 2121 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2122 { 2123 2124 IGMP_LOCK_ASSERT(); 2125 2126 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2127 /* 2128 * IGMPv1 and IGMPv2 Querier Present timers expired. 2129 * 2130 * Revert to IGMPv3. 2131 */ 2132 if (igi->igi_version != IGMP_VERSION_3) { 2133 CTR5(KTR_IGMPV3, 2134 "%s: transition from v%d -> v%d on %p(%s)", 2135 __func__, igi->igi_version, IGMP_VERSION_3, 2136 igi->igi_ifp, igi->igi_ifp->if_xname); 2137 igi->igi_version = IGMP_VERSION_3; 2138 } 2139 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2140 /* 2141 * IGMPv1 Querier Present timer expired, 2142 * IGMPv2 Querier Present timer running. 2143 * If IGMPv2 was disabled since last timeout, 2144 * revert to IGMPv3. 2145 * If IGMPv2 is enabled, revert to IGMPv2. 2146 */ 2147 if (!V_igmp_v2enable) { 2148 CTR5(KTR_IGMPV3, 2149 "%s: transition from v%d -> v%d on %p(%s)", 2150 __func__, igi->igi_version, IGMP_VERSION_3, 2151 igi->igi_ifp, igi->igi_ifp->if_xname); 2152 igi->igi_v2_timer = 0; 2153 igi->igi_version = IGMP_VERSION_3; 2154 } else { 2155 --igi->igi_v2_timer; 2156 if (igi->igi_version != IGMP_VERSION_2) { 2157 CTR5(KTR_IGMPV3, 2158 "%s: transition from v%d -> v%d on %p(%s)", 2159 __func__, igi->igi_version, IGMP_VERSION_2, 2160 igi->igi_ifp, igi->igi_ifp->if_xname); 2161 igi->igi_version = IGMP_VERSION_2; 2162 igmp_v3_cancel_link_timers(igi); 2163 } 2164 } 2165 } else if (igi->igi_v1_timer > 0) { 2166 /* 2167 * IGMPv1 Querier Present timer running. 2168 * Stop IGMPv2 timer if running. 2169 * 2170 * If IGMPv1 was disabled since last timeout, 2171 * revert to IGMPv3. 2172 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2173 */ 2174 if (!V_igmp_v1enable) { 2175 CTR5(KTR_IGMPV3, 2176 "%s: transition from v%d -> v%d on %p(%s)", 2177 __func__, igi->igi_version, IGMP_VERSION_3, 2178 igi->igi_ifp, igi->igi_ifp->if_xname); 2179 igi->igi_v1_timer = 0; 2180 igi->igi_version = IGMP_VERSION_3; 2181 } else { 2182 --igi->igi_v1_timer; 2183 } 2184 if (igi->igi_v2_timer > 0) { 2185 CTR3(KTR_IGMPV3, 2186 "%s: cancel v2 timer on %p(%s)", 2187 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2188 igi->igi_v2_timer = 0; 2189 } 2190 } 2191 } 2192 2193 /* 2194 * Global slowtimo handler. 2195 * VIMAGE: Timeout handlers are expected to service all vimages. 2196 */ 2197 void 2198 igmp_slowtimo(void) 2199 { 2200 VNET_ITERATOR_DECL(vnet_iter); 2201 2202 VNET_LIST_RLOCK_NOSLEEP(); 2203 VNET_FOREACH(vnet_iter) { 2204 CURVNET_SET(vnet_iter); 2205 igmp_slowtimo_vnet(); 2206 CURVNET_RESTORE(); 2207 } 2208 VNET_LIST_RUNLOCK_NOSLEEP(); 2209 } 2210 2211 /* 2212 * Per-vnet slowtimo handler. 2213 */ 2214 static void 2215 igmp_slowtimo_vnet(void) 2216 { 2217 struct igmp_ifsoftc *igi; 2218 2219 IGMP_LOCK(); 2220 2221 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2222 igmp_v1v2_process_querier_timers(igi); 2223 } 2224 2225 IGMP_UNLOCK(); 2226 } 2227 2228 /* 2229 * Dispatch an IGMPv1/v2 host report or leave message. 2230 * These are always small enough to fit inside a single mbuf. 2231 */ 2232 static int 2233 igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2234 { 2235 struct epoch_tracker et; 2236 struct ifnet *ifp; 2237 struct igmp *igmp; 2238 struct ip *ip; 2239 struct mbuf *m; 2240 2241 IN_MULTI_LIST_LOCK_ASSERT(); 2242 IGMP_LOCK_ASSERT(); 2243 2244 ifp = inm->inm_ifp; 2245 2246 m = m_gethdr(M_NOWAIT, MT_DATA); 2247 if (m == NULL) 2248 return (ENOMEM); 2249 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2250 2251 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2252 2253 m->m_data += sizeof(struct ip); 2254 m->m_len = sizeof(struct igmp); 2255 2256 igmp = mtod(m, struct igmp *); 2257 igmp->igmp_type = type; 2258 igmp->igmp_code = 0; 2259 igmp->igmp_group = inm->inm_addr; 2260 igmp->igmp_cksum = 0; 2261 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2262 2263 m->m_data -= sizeof(struct ip); 2264 m->m_len += sizeof(struct ip); 2265 2266 ip = mtod(m, struct ip *); 2267 ip->ip_tos = 0; 2268 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2269 ip->ip_off = 0; 2270 ip->ip_p = IPPROTO_IGMP; 2271 ip->ip_src.s_addr = INADDR_ANY; 2272 2273 if (type == IGMP_HOST_LEAVE_MESSAGE) 2274 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2275 else 2276 ip->ip_dst = inm->inm_addr; 2277 2278 igmp_save_context(m, ifp); 2279 2280 m->m_flags |= M_IGMPV2; 2281 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2282 m->m_flags |= M_IGMP_LOOP; 2283 2284 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2285 NET_EPOCH_ENTER(et); 2286 netisr_dispatch(NETISR_IGMP, m); 2287 NET_EPOCH_EXIT(et); 2288 2289 return (0); 2290 } 2291 2292 /* 2293 * Process a state change from the upper layer for the given IPv4 group. 2294 * 2295 * Each socket holds a reference on the in_multi in its own ip_moptions. 2296 * The socket layer will have made the necessary updates to.the group 2297 * state, it is now up to IGMP to issue a state change report if there 2298 * has been any change between T0 (when the last state-change was issued) 2299 * and T1 (now). 2300 * 2301 * We use the IGMPv3 state machine at group level. The IGMP module 2302 * however makes the decision as to which IGMP protocol version to speak. 2303 * A state change *from* INCLUDE {} always means an initial join. 2304 * A state change *to* INCLUDE {} always means a final leave. 2305 * 2306 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2307 * save ourselves a bunch of work; any exclusive mode groups need not 2308 * compute source filter lists. 2309 * 2310 * VIMAGE: curvnet should have been set by caller, as this routine 2311 * is called from the socket option handlers. 2312 */ 2313 int 2314 igmp_change_state(struct in_multi *inm) 2315 { 2316 struct igmp_ifsoftc *igi; 2317 struct ifnet *ifp; 2318 int error; 2319 2320 error = 0; 2321 IN_MULTI_LOCK_ASSERT(); 2322 /* 2323 * Try to detect if the upper layer just asked us to change state 2324 * for an interface which has now gone away. 2325 */ 2326 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2327 ifp = inm->inm_ifma->ifma_ifp; 2328 /* 2329 * Sanity check that netinet's notion of ifp is the 2330 * same as net's. 2331 */ 2332 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2333 2334 IGMP_LOCK(); 2335 2336 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2337 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2338 2339 /* 2340 * If we detect a state transition to or from MCAST_UNDEFINED 2341 * for this group, then we are starting or finishing an IGMP 2342 * life cycle for this group. 2343 */ 2344 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2345 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2346 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2347 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2348 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2349 error = igmp_initial_join(inm, igi); 2350 goto out_locked; 2351 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2352 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2353 igmp_final_leave(inm, igi); 2354 goto out_locked; 2355 } 2356 } else { 2357 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2358 } 2359 2360 error = igmp_handle_state_change(inm, igi); 2361 2362 out_locked: 2363 IGMP_UNLOCK(); 2364 return (error); 2365 } 2366 2367 /* 2368 * Perform the initial join for an IGMP group. 2369 * 2370 * When joining a group: 2371 * If the group should have its IGMP traffic suppressed, do nothing. 2372 * IGMPv1 starts sending IGMPv1 host membership reports. 2373 * IGMPv2 starts sending IGMPv2 host membership reports. 2374 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2375 * initial state of the membership. 2376 */ 2377 static int 2378 igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2379 { 2380 struct ifnet *ifp; 2381 struct mbufq *mq; 2382 int error, retval, syncstates; 2383 2384 CTR4(KTR_IGMPV3, "%s: initial join 0x%08x on ifp %p(%s)", __func__, 2385 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2386 2387 error = 0; 2388 syncstates = 1; 2389 2390 ifp = inm->inm_ifp; 2391 2392 IN_MULTI_LOCK_ASSERT(); 2393 IGMP_LOCK_ASSERT(); 2394 2395 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2396 2397 /* 2398 * Groups joined on loopback or marked as 'not reported', 2399 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2400 * are never reported in any IGMP protocol exchanges. 2401 * All other groups enter the appropriate IGMP state machine 2402 * for the version in use on this link. 2403 * A link marked as IGIF_SILENT causes IGMP to be completely 2404 * disabled for the link. 2405 */ 2406 if ((ifp->if_flags & IFF_LOOPBACK) || 2407 (igi->igi_flags & IGIF_SILENT) || 2408 !igmp_isgroupreported(inm->inm_addr)) { 2409 CTR1(KTR_IGMPV3, 2410 "%s: not kicking state machine for silent group", __func__); 2411 inm->inm_state = IGMP_SILENT_MEMBER; 2412 inm->inm_timer = 0; 2413 } else { 2414 /* 2415 * Deal with overlapping in_multi lifecycle. 2416 * If this group was LEAVING, then make sure 2417 * we drop the reference we picked up to keep the 2418 * group around for the final INCLUDE {} enqueue. 2419 */ 2420 if (igi->igi_version == IGMP_VERSION_3 && 2421 inm->inm_state == IGMP_LEAVING_MEMBER) { 2422 MPASS(inm->inm_refcount > 1); 2423 inm_rele_locked(NULL, inm); 2424 } 2425 inm->inm_state = IGMP_REPORTING_MEMBER; 2426 2427 switch (igi->igi_version) { 2428 case IGMP_VERSION_1: 2429 case IGMP_VERSION_2: 2430 inm->inm_state = IGMP_IDLE_MEMBER; 2431 error = igmp_v1v2_queue_report(inm, 2432 (igi->igi_version == IGMP_VERSION_2) ? 2433 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2434 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2435 if (error == 0) { 2436 inm->inm_timer = IGMP_RANDOM_DELAY( 2437 IGMP_V1V2_MAX_RI * PR_FASTHZ); 2438 V_current_state_timers_running = 1; 2439 } 2440 break; 2441 2442 case IGMP_VERSION_3: 2443 /* 2444 * Defer update of T0 to T1, until the first copy 2445 * of the state change has been transmitted. 2446 */ 2447 syncstates = 0; 2448 2449 /* 2450 * Immediately enqueue a State-Change Report for 2451 * this interface, freeing any previous reports. 2452 * Don't kick the timers if there is nothing to do, 2453 * or if an error occurred. 2454 */ 2455 mq = &inm->inm_scq; 2456 mbufq_drain(mq); 2457 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2458 0, 0); 2459 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2460 __func__, retval); 2461 if (retval <= 0) { 2462 error = retval * -1; 2463 break; 2464 } 2465 2466 /* 2467 * Schedule transmission of pending state-change 2468 * report up to RV times for this link. The timer 2469 * will fire at the next igmp_fasttimo (~200ms), 2470 * giving us an opportunity to merge the reports. 2471 */ 2472 if (igi->igi_flags & IGIF_LOOPBACK) { 2473 inm->inm_scrv = 1; 2474 } else { 2475 KASSERT(igi->igi_rv > 1, 2476 ("%s: invalid robustness %d", __func__, 2477 igi->igi_rv)); 2478 inm->inm_scrv = igi->igi_rv; 2479 } 2480 inm->inm_sctimer = 1; 2481 V_state_change_timers_running = 1; 2482 2483 error = 0; 2484 break; 2485 } 2486 } 2487 2488 /* 2489 * Only update the T0 state if state change is atomic, 2490 * i.e. we don't need to wait for a timer to fire before we 2491 * can consider the state change to have been communicated. 2492 */ 2493 if (syncstates) { 2494 inm_commit(inm); 2495 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2496 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2497 } 2498 2499 return (error); 2500 } 2501 2502 /* 2503 * Issue an intermediate state change during the IGMP life-cycle. 2504 */ 2505 static int 2506 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2507 { 2508 struct ifnet *ifp; 2509 int retval; 2510 2511 CTR4(KTR_IGMPV3, "%s: state change for 0x%08x on ifp %p(%s)", __func__, 2512 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2513 2514 ifp = inm->inm_ifp; 2515 2516 IN_MULTI_LIST_LOCK_ASSERT(); 2517 IGMP_LOCK_ASSERT(); 2518 2519 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2520 2521 if ((ifp->if_flags & IFF_LOOPBACK) || 2522 (igi->igi_flags & IGIF_SILENT) || 2523 !igmp_isgroupreported(inm->inm_addr) || 2524 (igi->igi_version != IGMP_VERSION_3)) { 2525 if (!igmp_isgroupreported(inm->inm_addr)) { 2526 CTR1(KTR_IGMPV3, 2527 "%s: not kicking state machine for silent group", __func__); 2528 } 2529 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2530 inm_commit(inm); 2531 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2532 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2533 return (0); 2534 } 2535 2536 mbufq_drain(&inm->inm_scq); 2537 2538 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2539 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2540 if (retval <= 0) 2541 return (-retval); 2542 2543 /* 2544 * If record(s) were enqueued, start the state-change 2545 * report timer for this group. 2546 */ 2547 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2548 inm->inm_sctimer = 1; 2549 V_state_change_timers_running = 1; 2550 2551 return (0); 2552 } 2553 2554 /* 2555 * Perform the final leave for an IGMP group. 2556 * 2557 * When leaving a group: 2558 * IGMPv1 does nothing. 2559 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2560 * IGMPv3 enqueues a state-change report containing a transition 2561 * to INCLUDE {} for immediate transmission. 2562 */ 2563 static void 2564 igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2565 { 2566 int syncstates; 2567 2568 syncstates = 1; 2569 2570 CTR4(KTR_IGMPV3, "%s: final leave 0x%08x on ifp %p(%s)", 2571 __func__, ntohl(inm->inm_addr.s_addr), inm->inm_ifp, 2572 inm->inm_ifp->if_xname); 2573 2574 IN_MULTI_LIST_LOCK_ASSERT(); 2575 IGMP_LOCK_ASSERT(); 2576 2577 switch (inm->inm_state) { 2578 case IGMP_NOT_MEMBER: 2579 case IGMP_SILENT_MEMBER: 2580 case IGMP_LEAVING_MEMBER: 2581 /* Already leaving or left; do nothing. */ 2582 CTR1(KTR_IGMPV3, 2583 "%s: not kicking state machine for silent group", __func__); 2584 break; 2585 case IGMP_REPORTING_MEMBER: 2586 case IGMP_IDLE_MEMBER: 2587 case IGMP_G_QUERY_PENDING_MEMBER: 2588 case IGMP_SG_QUERY_PENDING_MEMBER: 2589 if (igi->igi_version == IGMP_VERSION_2) { 2590 #ifdef INVARIANTS 2591 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2592 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2593 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2594 __func__); 2595 #endif 2596 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2597 inm->inm_state = IGMP_NOT_MEMBER; 2598 } else if (igi->igi_version == IGMP_VERSION_3) { 2599 /* 2600 * Stop group timer and all pending reports. 2601 * Immediately enqueue a state-change report 2602 * TO_IN {} to be sent on the next fast timeout, 2603 * giving us an opportunity to merge reports. 2604 */ 2605 mbufq_drain(&inm->inm_scq); 2606 inm->inm_timer = 0; 2607 if (igi->igi_flags & IGIF_LOOPBACK) { 2608 inm->inm_scrv = 1; 2609 } else { 2610 inm->inm_scrv = igi->igi_rv; 2611 } 2612 CTR4(KTR_IGMPV3, "%s: Leaving 0x%08x/%s with %d " 2613 "pending retransmissions.", __func__, 2614 ntohl(inm->inm_addr.s_addr), 2615 inm->inm_ifp->if_xname, inm->inm_scrv); 2616 if (inm->inm_scrv == 0) { 2617 inm->inm_state = IGMP_NOT_MEMBER; 2618 inm->inm_sctimer = 0; 2619 } else { 2620 int retval __unused; 2621 2622 inm_acquire_locked(inm); 2623 2624 retval = igmp_v3_enqueue_group_record( 2625 &inm->inm_scq, inm, 1, 0, 0); 2626 KASSERT(retval != 0, 2627 ("%s: enqueue record = %d", __func__, 2628 retval)); 2629 2630 inm->inm_state = IGMP_LEAVING_MEMBER; 2631 inm->inm_sctimer = 1; 2632 V_state_change_timers_running = 1; 2633 syncstates = 0; 2634 } 2635 break; 2636 } 2637 break; 2638 case IGMP_LAZY_MEMBER: 2639 case IGMP_SLEEPING_MEMBER: 2640 case IGMP_AWAKENING_MEMBER: 2641 /* Our reports are suppressed; do nothing. */ 2642 break; 2643 } 2644 2645 if (syncstates) { 2646 inm_commit(inm); 2647 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2648 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2649 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2650 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for 0x%08x/%s", 2651 __func__, ntohl(inm->inm_addr.s_addr), 2652 inm->inm_ifp->if_xname); 2653 } 2654 } 2655 2656 /* 2657 * Enqueue an IGMPv3 group record to the given output queue. 2658 * 2659 * XXX This function could do with having the allocation code 2660 * split out, and the multiple-tree-walks coalesced into a single 2661 * routine as has been done in igmp_v3_enqueue_filter_change(). 2662 * 2663 * If is_state_change is zero, a current-state record is appended. 2664 * If is_state_change is non-zero, a state-change report is appended. 2665 * 2666 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2667 * If is_group_query is zero, and if there is a packet with free space 2668 * at the tail of the queue, it will be appended to providing there 2669 * is enough free space. 2670 * Otherwise a new mbuf packet chain is allocated. 2671 * 2672 * If is_source_query is non-zero, each source is checked to see if 2673 * it was recorded for a Group-Source query, and will be omitted if 2674 * it is not both in-mode and recorded. 2675 * 2676 * The function will attempt to allocate leading space in the packet 2677 * for the IP/IGMP header to be prepended without fragmenting the chain. 2678 * 2679 * If successful the size of all data appended to the queue is returned, 2680 * otherwise an error code less than zero is returned, or zero if 2681 * no record(s) were appended. 2682 */ 2683 static int 2684 igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2685 const int is_state_change, const int is_group_query, 2686 const int is_source_query) 2687 { 2688 struct igmp_grouprec ig; 2689 struct igmp_grouprec *pig; 2690 struct ifnet *ifp; 2691 struct ip_msource *ims, *nims; 2692 struct mbuf *m0, *m, *md; 2693 int is_filter_list_change; 2694 int minrec0len, m0srcs, msrcs, nbytes, off; 2695 int record_has_sources; 2696 int now; 2697 int type; 2698 in_addr_t naddr; 2699 uint8_t mode; 2700 2701 IN_MULTI_LIST_LOCK_ASSERT(); 2702 2703 ifp = inm->inm_ifp; 2704 is_filter_list_change = 0; 2705 m = NULL; 2706 m0 = NULL; 2707 m0srcs = 0; 2708 msrcs = 0; 2709 nbytes = 0; 2710 nims = NULL; 2711 record_has_sources = 1; 2712 pig = NULL; 2713 type = IGMP_DO_NOTHING; 2714 mode = inm->inm_st[1].iss_fmode; 2715 2716 /* 2717 * If we did not transition out of ASM mode during t0->t1, 2718 * and there are no source nodes to process, we can skip 2719 * the generation of source records. 2720 */ 2721 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2722 inm->inm_nsrc == 0) 2723 record_has_sources = 0; 2724 2725 if (is_state_change) { 2726 /* 2727 * Queue a state change record. 2728 * If the mode did not change, and there are non-ASM 2729 * listeners or source filters present, 2730 * we potentially need to issue two records for the group. 2731 * If we are transitioning to MCAST_UNDEFINED, we need 2732 * not send any sources. 2733 * If there are ASM listeners, and there was no filter 2734 * mode transition of any kind, do nothing. 2735 */ 2736 if (mode != inm->inm_st[0].iss_fmode) { 2737 if (mode == MCAST_EXCLUDE) { 2738 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2739 __func__); 2740 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2741 } else { 2742 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2743 __func__); 2744 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2745 if (mode == MCAST_UNDEFINED) 2746 record_has_sources = 0; 2747 } 2748 } else { 2749 if (record_has_sources) { 2750 is_filter_list_change = 1; 2751 } else { 2752 type = IGMP_DO_NOTHING; 2753 } 2754 } 2755 } else { 2756 /* 2757 * Queue a current state record. 2758 */ 2759 if (mode == MCAST_EXCLUDE) { 2760 type = IGMP_MODE_IS_EXCLUDE; 2761 } else if (mode == MCAST_INCLUDE) { 2762 type = IGMP_MODE_IS_INCLUDE; 2763 KASSERT(inm->inm_st[1].iss_asm == 0, 2764 ("%s: inm %p is INCLUDE but ASM count is %d", 2765 __func__, inm, inm->inm_st[1].iss_asm)); 2766 } 2767 } 2768 2769 /* 2770 * Generate the filter list changes using a separate function. 2771 */ 2772 if (is_filter_list_change) 2773 return (igmp_v3_enqueue_filter_change(mq, inm)); 2774 2775 if (type == IGMP_DO_NOTHING) { 2776 CTR3(KTR_IGMPV3, "%s: nothing to do for 0x%08x/%s", __func__, 2777 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2778 return (0); 2779 } 2780 2781 /* 2782 * If any sources are present, we must be able to fit at least 2783 * one in the trailing space of the tail packet's mbuf, 2784 * ideally more. 2785 */ 2786 minrec0len = sizeof(struct igmp_grouprec); 2787 if (record_has_sources) 2788 minrec0len += sizeof(in_addr_t); 2789 2790 CTR4(KTR_IGMPV3, "%s: queueing %s for 0x%08x/%s", __func__, 2791 igmp_rec_type_to_str(type), ntohl(inm->inm_addr.s_addr), 2792 inm->inm_ifp->if_xname); 2793 2794 /* 2795 * Check if we have a packet in the tail of the queue for this 2796 * group into which the first group record for this group will fit. 2797 * Otherwise allocate a new packet. 2798 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2799 * Note: Group records for G/GSR query responses MUST be sent 2800 * in their own packet. 2801 */ 2802 m0 = mbufq_last(mq); 2803 if (!is_group_query && 2804 m0 != NULL && 2805 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2806 (m0->m_pkthdr.len + minrec0len) < 2807 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2808 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2809 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2810 m = m0; 2811 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2812 } else { 2813 if (mbufq_full(mq)) { 2814 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2815 return (-ENOMEM); 2816 } 2817 m = NULL; 2818 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2819 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2820 if (!is_state_change && !is_group_query) { 2821 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2822 if (m) 2823 m->m_data += IGMP_LEADINGSPACE; 2824 } 2825 if (m == NULL) { 2826 m = m_gethdr(M_NOWAIT, MT_DATA); 2827 if (m) 2828 M_ALIGN(m, IGMP_LEADINGSPACE); 2829 } 2830 if (m == NULL) 2831 return (-ENOMEM); 2832 2833 igmp_save_context(m, ifp); 2834 2835 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2836 } 2837 2838 /* 2839 * Append group record. 2840 * If we have sources, we don't know how many yet. 2841 */ 2842 ig.ig_type = type; 2843 ig.ig_datalen = 0; 2844 ig.ig_numsrc = 0; 2845 ig.ig_group = inm->inm_addr; 2846 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2847 if (m != m0) 2848 m_freem(m); 2849 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2850 return (-ENOMEM); 2851 } 2852 nbytes += sizeof(struct igmp_grouprec); 2853 2854 /* 2855 * Append as many sources as will fit in the first packet. 2856 * If we are appending to a new packet, the chain allocation 2857 * may potentially use clusters; use m_getptr() in this case. 2858 * If we are appending to an existing packet, we need to obtain 2859 * a pointer to the group record after m_append(), in case a new 2860 * mbuf was allocated. 2861 * Only append sources which are in-mode at t1. If we are 2862 * transitioning to MCAST_UNDEFINED state on the group, do not 2863 * include source entries. 2864 * Only report recorded sources in our filter set when responding 2865 * to a group-source query. 2866 */ 2867 if (record_has_sources) { 2868 if (m == m0) { 2869 md = m_last(m); 2870 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2871 md->m_len - nbytes); 2872 } else { 2873 md = m_getptr(m, 0, &off); 2874 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2875 off); 2876 } 2877 msrcs = 0; 2878 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2879 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2880 ims->ims_haddr); 2881 now = ims_get_mode(inm, ims, 1); 2882 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2883 if ((now != mode) || 2884 (now == mode && mode == MCAST_UNDEFINED)) { 2885 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2886 continue; 2887 } 2888 if (is_source_query && ims->ims_stp == 0) { 2889 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2890 __func__); 2891 continue; 2892 } 2893 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2894 naddr = htonl(ims->ims_haddr); 2895 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2896 if (m != m0) 2897 m_freem(m); 2898 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2899 __func__); 2900 return (-ENOMEM); 2901 } 2902 nbytes += sizeof(in_addr_t); 2903 ++msrcs; 2904 if (msrcs == m0srcs) 2905 break; 2906 } 2907 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2908 msrcs); 2909 pig->ig_numsrc = htons(msrcs); 2910 nbytes += (msrcs * sizeof(in_addr_t)); 2911 } 2912 2913 if (is_source_query && msrcs == 0) { 2914 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2915 if (m != m0) 2916 m_freem(m); 2917 return (0); 2918 } 2919 2920 /* 2921 * We are good to go with first packet. 2922 */ 2923 if (m != m0) { 2924 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2925 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2926 mbufq_enqueue(mq, m); 2927 } else 2928 m->m_pkthdr.PH_vt.vt_nrecs++; 2929 2930 /* 2931 * No further work needed if no source list in packet(s). 2932 */ 2933 if (!record_has_sources) 2934 return (nbytes); 2935 2936 /* 2937 * Whilst sources remain to be announced, we need to allocate 2938 * a new packet and fill out as many sources as will fit. 2939 * Always try for a cluster first. 2940 */ 2941 while (nims != NULL) { 2942 if (mbufq_full(mq)) { 2943 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2944 return (-ENOMEM); 2945 } 2946 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2947 if (m) 2948 m->m_data += IGMP_LEADINGSPACE; 2949 if (m == NULL) { 2950 m = m_gethdr(M_NOWAIT, MT_DATA); 2951 if (m) 2952 M_ALIGN(m, IGMP_LEADINGSPACE); 2953 } 2954 if (m == NULL) 2955 return (-ENOMEM); 2956 igmp_save_context(m, ifp); 2957 md = m_getptr(m, 0, &off); 2958 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2959 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2960 2961 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2962 if (m != m0) 2963 m_freem(m); 2964 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2965 return (-ENOMEM); 2966 } 2967 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2968 nbytes += sizeof(struct igmp_grouprec); 2969 2970 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2971 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2972 2973 msrcs = 0; 2974 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2975 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2976 ims->ims_haddr); 2977 now = ims_get_mode(inm, ims, 1); 2978 if ((now != mode) || 2979 (now == mode && mode == MCAST_UNDEFINED)) { 2980 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2981 continue; 2982 } 2983 if (is_source_query && ims->ims_stp == 0) { 2984 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2985 __func__); 2986 continue; 2987 } 2988 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2989 naddr = htonl(ims->ims_haddr); 2990 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2991 if (m != m0) 2992 m_freem(m); 2993 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2994 __func__); 2995 return (-ENOMEM); 2996 } 2997 ++msrcs; 2998 if (msrcs == m0srcs) 2999 break; 3000 } 3001 pig->ig_numsrc = htons(msrcs); 3002 nbytes += (msrcs * sizeof(in_addr_t)); 3003 3004 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 3005 mbufq_enqueue(mq, m); 3006 } 3007 3008 return (nbytes); 3009 } 3010 3011 /* 3012 * Type used to mark record pass completion. 3013 * We exploit the fact we can cast to this easily from the 3014 * current filter modes on each ip_msource node. 3015 */ 3016 typedef enum { 3017 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 3018 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 3019 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 3020 REC_FULL = REC_ALLOW | REC_BLOCK 3021 } rectype_t; 3022 3023 /* 3024 * Enqueue an IGMPv3 filter list change to the given output queue. 3025 * 3026 * Source list filter state is held in an RB-tree. When the filter list 3027 * for a group is changed without changing its mode, we need to compute 3028 * the deltas between T0 and T1 for each source in the filter set, 3029 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 3030 * 3031 * As we may potentially queue two record types, and the entire R-B tree 3032 * needs to be walked at once, we break this out into its own function 3033 * so we can generate a tightly packed queue of packets. 3034 * 3035 * XXX This could be written to only use one tree walk, although that makes 3036 * serializing into the mbuf chains a bit harder. For now we do two walks 3037 * which makes things easier on us, and it may or may not be harder on 3038 * the L2 cache. 3039 * 3040 * If successful the size of all data appended to the queue is returned, 3041 * otherwise an error code less than zero is returned, or zero if 3042 * no record(s) were appended. 3043 */ 3044 static int 3045 igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3046 { 3047 static const int MINRECLEN = 3048 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3049 struct ifnet *ifp; 3050 struct igmp_grouprec ig; 3051 struct igmp_grouprec *pig; 3052 struct ip_msource *ims, *nims; 3053 struct mbuf *m, *m0, *md; 3054 in_addr_t naddr; 3055 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3056 int nallow, nblock; 3057 uint8_t mode, now, then; 3058 rectype_t crt, drt, nrt; 3059 3060 IN_MULTI_LIST_LOCK_ASSERT(); 3061 3062 if (inm->inm_nsrc == 0 || 3063 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3064 return (0); 3065 3066 ifp = inm->inm_ifp; /* interface */ 3067 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3068 crt = REC_NONE; /* current group record type */ 3069 drt = REC_NONE; /* mask of completed group record types */ 3070 nrt = REC_NONE; /* record type for current node */ 3071 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3072 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3073 npbytes = 0; /* # of bytes appended this packet */ 3074 rsrcs = 0; /* # sources encoded in current record */ 3075 schanged = 0; /* # nodes encoded in overall filter change */ 3076 nallow = 0; /* # of source entries in ALLOW_NEW */ 3077 nblock = 0; /* # of source entries in BLOCK_OLD */ 3078 nims = NULL; /* next tree node pointer */ 3079 3080 /* 3081 * For each possible filter record mode. 3082 * The first kind of source we encounter tells us which 3083 * is the first kind of record we start appending. 3084 * If a node transitioned to UNDEFINED at t1, its mode is treated 3085 * as the inverse of the group's filter mode. 3086 */ 3087 while (drt != REC_FULL) { 3088 do { 3089 m0 = mbufq_last(mq); 3090 if (m0 != NULL && 3091 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= 3092 IGMP_V3_REPORT_MAXRECS) && 3093 (m0->m_pkthdr.len + MINRECLEN) < 3094 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3095 m = m0; 3096 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3097 sizeof(struct igmp_grouprec)) / 3098 sizeof(in_addr_t); 3099 CTR1(KTR_IGMPV3, 3100 "%s: use previous packet", __func__); 3101 } else { 3102 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3103 if (m) 3104 m->m_data += IGMP_LEADINGSPACE; 3105 if (m == NULL) { 3106 m = m_gethdr(M_NOWAIT, MT_DATA); 3107 if (m) 3108 M_ALIGN(m, IGMP_LEADINGSPACE); 3109 } 3110 if (m == NULL) { 3111 CTR1(KTR_IGMPV3, 3112 "%s: m_get*() failed", __func__); 3113 return (-ENOMEM); 3114 } 3115 m->m_pkthdr.PH_vt.vt_nrecs = 0; 3116 igmp_save_context(m, ifp); 3117 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3118 sizeof(struct igmp_grouprec)) / 3119 sizeof(in_addr_t); 3120 npbytes = 0; 3121 CTR1(KTR_IGMPV3, 3122 "%s: allocated new packet", __func__); 3123 } 3124 /* 3125 * Append the IGMP group record header to the 3126 * current packet's data area. 3127 * Recalculate pointer to free space for next 3128 * group record, in case m_append() allocated 3129 * a new mbuf or cluster. 3130 */ 3131 memset(&ig, 0, sizeof(ig)); 3132 ig.ig_group = inm->inm_addr; 3133 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3134 if (m != m0) 3135 m_freem(m); 3136 CTR1(KTR_IGMPV3, 3137 "%s: m_append() failed", __func__); 3138 return (-ENOMEM); 3139 } 3140 npbytes += sizeof(struct igmp_grouprec); 3141 if (m != m0) { 3142 /* new packet; offset in c hain */ 3143 md = m_getptr(m, npbytes - 3144 sizeof(struct igmp_grouprec), &off); 3145 pig = (struct igmp_grouprec *)(mtod(md, 3146 uint8_t *) + off); 3147 } else { 3148 /* current packet; offset from last append */ 3149 md = m_last(m); 3150 pig = (struct igmp_grouprec *)(mtod(md, 3151 uint8_t *) + md->m_len - 3152 sizeof(struct igmp_grouprec)); 3153 } 3154 /* 3155 * Begin walking the tree for this record type 3156 * pass, or continue from where we left off 3157 * previously if we had to allocate a new packet. 3158 * Only report deltas in-mode at t1. 3159 * We need not report included sources as allowed 3160 * if we are in inclusive mode on the group, 3161 * however the converse is not true. 3162 */ 3163 rsrcs = 0; 3164 if (nims == NULL) 3165 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3166 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3167 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", 3168 __func__, ims->ims_haddr); 3169 now = ims_get_mode(inm, ims, 1); 3170 then = ims_get_mode(inm, ims, 0); 3171 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3172 __func__, then, now); 3173 if (now == then) { 3174 CTR1(KTR_IGMPV3, 3175 "%s: skip unchanged", __func__); 3176 continue; 3177 } 3178 if (mode == MCAST_EXCLUDE && 3179 now == MCAST_INCLUDE) { 3180 CTR1(KTR_IGMPV3, 3181 "%s: skip IN src on EX group", 3182 __func__); 3183 continue; 3184 } 3185 nrt = (rectype_t)now; 3186 if (nrt == REC_NONE) 3187 nrt = (rectype_t)(~mode & REC_FULL); 3188 if (schanged++ == 0) { 3189 crt = nrt; 3190 } else if (crt != nrt) 3191 continue; 3192 naddr = htonl(ims->ims_haddr); 3193 if (!m_append(m, sizeof(in_addr_t), 3194 (void *)&naddr)) { 3195 if (m != m0) 3196 m_freem(m); 3197 CTR1(KTR_IGMPV3, 3198 "%s: m_append() failed", __func__); 3199 return (-ENOMEM); 3200 } 3201 nallow += !!(crt == REC_ALLOW); 3202 nblock += !!(crt == REC_BLOCK); 3203 if (++rsrcs == m0srcs) 3204 break; 3205 } 3206 /* 3207 * If we did not append any tree nodes on this 3208 * pass, back out of allocations. 3209 */ 3210 if (rsrcs == 0) { 3211 npbytes -= sizeof(struct igmp_grouprec); 3212 if (m != m0) { 3213 CTR1(KTR_IGMPV3, 3214 "%s: m_free(m)", __func__); 3215 m_freem(m); 3216 } else { 3217 CTR1(KTR_IGMPV3, 3218 "%s: m_adj(m, -ig)", __func__); 3219 m_adj(m, -((int)sizeof( 3220 struct igmp_grouprec))); 3221 } 3222 continue; 3223 } 3224 npbytes += (rsrcs * sizeof(in_addr_t)); 3225 if (crt == REC_ALLOW) 3226 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3227 else if (crt == REC_BLOCK) 3228 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3229 pig->ig_numsrc = htons(rsrcs); 3230 /* 3231 * Count the new group record, and enqueue this 3232 * packet if it wasn't already queued. 3233 */ 3234 m->m_pkthdr.PH_vt.vt_nrecs++; 3235 if (m != m0) 3236 mbufq_enqueue(mq, m); 3237 nbytes += npbytes; 3238 } while (nims != NULL); 3239 drt |= crt; 3240 crt = (~crt & REC_FULL); 3241 } 3242 3243 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3244 nallow, nblock); 3245 3246 return (nbytes); 3247 } 3248 3249 static int 3250 igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3251 { 3252 struct mbufq *gq; 3253 struct mbuf *m; /* pending state-change */ 3254 struct mbuf *m0; /* copy of pending state-change */ 3255 struct mbuf *mt; /* last state-change in packet */ 3256 int docopy, domerge; 3257 u_int recslen; 3258 3259 docopy = 0; 3260 domerge = 0; 3261 recslen = 0; 3262 3263 IN_MULTI_LIST_LOCK_ASSERT(); 3264 IGMP_LOCK_ASSERT(); 3265 3266 /* 3267 * If there are further pending retransmissions, make a writable 3268 * copy of each queued state-change message before merging. 3269 */ 3270 if (inm->inm_scrv > 0) 3271 docopy = 1; 3272 3273 gq = &inm->inm_scq; 3274 #ifdef KTR 3275 if (mbufq_first(gq) == NULL) { 3276 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3277 __func__, inm); 3278 } 3279 #endif 3280 3281 m = mbufq_first(gq); 3282 while (m != NULL) { 3283 /* 3284 * Only merge the report into the current packet if 3285 * there is sufficient space to do so; an IGMPv3 report 3286 * packet may only contain 65,535 group records. 3287 * Always use a simple mbuf chain concatentation to do this, 3288 * as large state changes for single groups may have 3289 * allocated clusters. 3290 */ 3291 domerge = 0; 3292 mt = mbufq_last(scq); 3293 if (mt != NULL) { 3294 recslen = m_length(m, NULL); 3295 3296 if ((mt->m_pkthdr.PH_vt.vt_nrecs + 3297 m->m_pkthdr.PH_vt.vt_nrecs <= 3298 IGMP_V3_REPORT_MAXRECS) && 3299 (mt->m_pkthdr.len + recslen <= 3300 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3301 domerge = 1; 3302 } 3303 3304 if (!domerge && mbufq_full(gq)) { 3305 CTR2(KTR_IGMPV3, 3306 "%s: outbound queue full, skipping whole packet %p", 3307 __func__, m); 3308 mt = m->m_nextpkt; 3309 if (!docopy) 3310 m_freem(m); 3311 m = mt; 3312 continue; 3313 } 3314 3315 if (!docopy) { 3316 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3317 m0 = mbufq_dequeue(gq); 3318 m = m0->m_nextpkt; 3319 } else { 3320 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3321 m0 = m_dup(m, M_NOWAIT); 3322 if (m0 == NULL) 3323 return (ENOMEM); 3324 m0->m_nextpkt = NULL; 3325 m = m->m_nextpkt; 3326 } 3327 3328 if (!domerge) { 3329 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3330 __func__, m0, scq); 3331 mbufq_enqueue(scq, m0); 3332 } else { 3333 struct mbuf *mtl; /* last mbuf of packet mt */ 3334 3335 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3336 __func__, m0, mt); 3337 3338 mtl = m_last(mt); 3339 m0->m_flags &= ~M_PKTHDR; 3340 mt->m_pkthdr.len += recslen; 3341 mt->m_pkthdr.PH_vt.vt_nrecs += 3342 m0->m_pkthdr.PH_vt.vt_nrecs; 3343 3344 mtl->m_next = m0; 3345 } 3346 } 3347 3348 return (0); 3349 } 3350 3351 /* 3352 * Respond to a pending IGMPv3 General Query. 3353 */ 3354 static void 3355 igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3356 { 3357 struct ifmultiaddr *ifma; 3358 struct ifnet *ifp; 3359 struct in_multi *inm; 3360 int retval __unused, loop; 3361 3362 IN_MULTI_LIST_LOCK_ASSERT(); 3363 IGMP_LOCK_ASSERT(); 3364 NET_EPOCH_ASSERT(); 3365 3366 KASSERT(igi->igi_version == IGMP_VERSION_3, 3367 ("%s: called when version %d", __func__, igi->igi_version)); 3368 3369 /* 3370 * Check that there are some packets queued. If so, send them first. 3371 * For large number of groups the reply to general query can take 3372 * many packets, we should finish sending them before starting of 3373 * queuing the new reply. 3374 */ 3375 if (mbufq_len(&igi->igi_gq) != 0) 3376 goto send; 3377 3378 ifp = igi->igi_ifp; 3379 3380 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3381 if (ifma->ifma_addr->sa_family != AF_INET || 3382 ifma->ifma_protospec == NULL) 3383 continue; 3384 3385 inm = (struct in_multi *)ifma->ifma_protospec; 3386 KASSERT(ifp == inm->inm_ifp, 3387 ("%s: inconsistent ifp", __func__)); 3388 3389 switch (inm->inm_state) { 3390 case IGMP_NOT_MEMBER: 3391 case IGMP_SILENT_MEMBER: 3392 break; 3393 case IGMP_REPORTING_MEMBER: 3394 case IGMP_IDLE_MEMBER: 3395 case IGMP_LAZY_MEMBER: 3396 case IGMP_SLEEPING_MEMBER: 3397 case IGMP_AWAKENING_MEMBER: 3398 inm->inm_state = IGMP_REPORTING_MEMBER; 3399 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3400 inm, 0, 0, 0); 3401 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3402 __func__, retval); 3403 break; 3404 case IGMP_G_QUERY_PENDING_MEMBER: 3405 case IGMP_SG_QUERY_PENDING_MEMBER: 3406 case IGMP_LEAVING_MEMBER: 3407 break; 3408 } 3409 } 3410 3411 send: 3412 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3413 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3414 3415 /* 3416 * Slew transmission of bursts over 500ms intervals. 3417 */ 3418 if (mbufq_first(&igi->igi_gq) != NULL) { 3419 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3420 IGMP_RESPONSE_BURST_INTERVAL); 3421 V_interface_timers_running = 1; 3422 } 3423 } 3424 3425 /* 3426 * Transmit the next pending IGMP message in the output queue. 3427 * 3428 * We get called from netisr_processqueue(). A mutex private to igmpoq 3429 * will be acquired and released around this routine. 3430 * 3431 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3432 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3433 * a link and uses a link-scope multicast address. 3434 */ 3435 static void 3436 igmp_intr(struct mbuf *m) 3437 { 3438 struct ip_moptions imo; 3439 struct ifnet *ifp; 3440 struct mbuf *ipopts, *m0; 3441 int error; 3442 uint32_t ifindex; 3443 3444 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3445 3446 /* 3447 * Set VNET image pointer from enqueued mbuf chain 3448 * before doing anything else. Whilst we use interface 3449 * indexes to guard against interface detach, they are 3450 * unique to each VIMAGE and must be retrieved. 3451 */ 3452 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3453 ifindex = igmp_restore_context(m); 3454 3455 /* 3456 * Check if the ifnet still exists. This limits the scope of 3457 * any race in the absence of a global ifp lock for low cost 3458 * (an array lookup). 3459 */ 3460 ifp = ifnet_byindex(ifindex); 3461 if (ifp == NULL) { 3462 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3463 __func__, m, ifindex); 3464 m_freem(m); 3465 IPSTAT_INC(ips_noroute); 3466 goto out; 3467 } 3468 3469 ipopts = V_igmp_sendra ? m_raopt : NULL; 3470 3471 imo.imo_multicast_ttl = 1; 3472 imo.imo_multicast_vif = -1; 3473 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3474 3475 /* 3476 * If the user requested that IGMP traffic be explicitly 3477 * redirected to the loopback interface (e.g. they are running a 3478 * MANET interface and the routing protocol needs to see the 3479 * updates), handle this now. 3480 */ 3481 if (m->m_flags & M_IGMP_LOOP) 3482 imo.imo_multicast_ifp = V_loif; 3483 else 3484 imo.imo_multicast_ifp = ifp; 3485 3486 if (m->m_flags & M_IGMPV2) { 3487 m0 = m; 3488 } else { 3489 m0 = igmp_v3_encap_report(ifp, m); 3490 if (m0 == NULL) { 3491 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3492 m_freem(m); 3493 IPSTAT_INC(ips_odropped); 3494 goto out; 3495 } 3496 } 3497 3498 igmp_scrub_context(m0); 3499 m_clrprotoflags(m); 3500 m0->m_pkthdr.rcvif = V_loif; 3501 #ifdef MAC 3502 mac_netinet_igmp_send(ifp, m0); 3503 #endif 3504 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3505 if (error) { 3506 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3507 goto out; 3508 } 3509 3510 IGMPSTAT_INC(igps_snd_reports); 3511 3512 out: 3513 /* 3514 * We must restore the existing vnet pointer before 3515 * continuing as we are run from netisr context. 3516 */ 3517 CURVNET_RESTORE(); 3518 } 3519 3520 /* 3521 * Encapsulate an IGMPv3 report. 3522 * 3523 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3524 * chain has already had its IP/IGMPv3 header prepended. In this case 3525 * the function will not attempt to prepend; the lengths and checksums 3526 * will however be re-computed. 3527 * 3528 * Returns a pointer to the new mbuf chain head, or NULL if the 3529 * allocation failed. 3530 */ 3531 static struct mbuf * 3532 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3533 { 3534 struct rm_priotracker in_ifa_tracker; 3535 struct igmp_report *igmp; 3536 struct ip *ip; 3537 int hdrlen, igmpreclen; 3538 3539 KASSERT((m->m_flags & M_PKTHDR), 3540 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3541 3542 igmpreclen = m_length(m, NULL); 3543 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); 3544 3545 if (m->m_flags & M_IGMPV3_HDR) { 3546 igmpreclen -= hdrlen; 3547 } else { 3548 M_PREPEND(m, hdrlen, M_NOWAIT); 3549 if (m == NULL) 3550 return (NULL); 3551 m->m_flags |= M_IGMPV3_HDR; 3552 } 3553 3554 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen); 3555 3556 m->m_data += sizeof(struct ip); 3557 m->m_len -= sizeof(struct ip); 3558 3559 igmp = mtod(m, struct igmp_report *); 3560 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; 3561 igmp->ir_rsv1 = 0; 3562 igmp->ir_rsv2 = 0; 3563 igmp->ir_numgrps = htons(m->m_pkthdr.PH_vt.vt_nrecs); 3564 igmp->ir_cksum = 0; 3565 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3566 m->m_pkthdr.PH_vt.vt_nrecs = 0; 3567 3568 m->m_data -= sizeof(struct ip); 3569 m->m_len += sizeof(struct ip); 3570 3571 ip = mtod(m, struct ip *); 3572 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; 3573 ip->ip_len = htons(hdrlen + igmpreclen); 3574 ip->ip_off = htons(IP_DF); 3575 ip->ip_p = IPPROTO_IGMP; 3576 ip->ip_sum = 0; 3577 3578 ip->ip_src.s_addr = INADDR_ANY; 3579 3580 if (m->m_flags & M_IGMP_LOOP) { 3581 struct in_ifaddr *ia; 3582 3583 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 3584 if (ia != NULL) 3585 ip->ip_src = ia->ia_addr.sin_addr; 3586 } 3587 3588 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); 3589 3590 return (m); 3591 } 3592 3593 #ifdef KTR 3594 static char * 3595 igmp_rec_type_to_str(const int type) 3596 { 3597 3598 switch (type) { 3599 case IGMP_CHANGE_TO_EXCLUDE_MODE: 3600 return "TO_EX"; 3601 break; 3602 case IGMP_CHANGE_TO_INCLUDE_MODE: 3603 return "TO_IN"; 3604 break; 3605 case IGMP_MODE_IS_EXCLUDE: 3606 return "MODE_EX"; 3607 break; 3608 case IGMP_MODE_IS_INCLUDE: 3609 return "MODE_IN"; 3610 break; 3611 case IGMP_ALLOW_NEW_SOURCES: 3612 return "ALLOW_NEW"; 3613 break; 3614 case IGMP_BLOCK_OLD_SOURCES: 3615 return "BLOCK_OLD"; 3616 break; 3617 default: 3618 break; 3619 } 3620 return "unknown"; 3621 } 3622 #endif 3623 3624 #ifdef VIMAGE 3625 static void 3626 vnet_igmp_init(const void *unused __unused) 3627 { 3628 3629 netisr_register_vnet(&igmp_nh); 3630 } 3631 VNET_SYSINIT(vnet_igmp_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3632 vnet_igmp_init, NULL); 3633 3634 static void 3635 vnet_igmp_uninit(const void *unused __unused) 3636 { 3637 3638 /* This can happen when we shutdown the entire network stack. */ 3639 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3640 3641 netisr_unregister_vnet(&igmp_nh); 3642 } 3643 VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3644 vnet_igmp_uninit, NULL); 3645 #endif 3646 3647 #ifdef DDB 3648 DB_SHOW_COMMAND(igi_list, db_show_igi_list) 3649 { 3650 struct igmp_ifsoftc *igi, *tigi; 3651 LIST_HEAD(_igi_list, igmp_ifsoftc) *igi_head; 3652 3653 if (!have_addr) { 3654 db_printf("usage: show igi_list <addr>\n"); 3655 return; 3656 } 3657 igi_head = (struct _igi_list *)addr; 3658 3659 LIST_FOREACH_SAFE(igi, igi_head, igi_link, tigi) { 3660 db_printf("igmp_ifsoftc %p:\n", igi); 3661 db_printf(" ifp %p\n", igi->igi_ifp); 3662 db_printf(" version %u\n", igi->igi_version); 3663 db_printf(" v1_timer %u\n", igi->igi_v1_timer); 3664 db_printf(" v2_timer %u\n", igi->igi_v2_timer); 3665 db_printf(" v3_timer %u\n", igi->igi_v3_timer); 3666 db_printf(" flags %#x\n", igi->igi_flags); 3667 db_printf(" rv %u\n", igi->igi_rv); 3668 db_printf(" qi %u\n", igi->igi_qi); 3669 db_printf(" qri %u\n", igi->igi_qri); 3670 db_printf(" uri %u\n", igi->igi_uri); 3671 /* struct mbufq igi_gq; */ 3672 db_printf("\n"); 3673 } 3674 } 3675 #endif 3676 3677 static int 3678 igmp_modevent(module_t mod, int type, void *unused __unused) 3679 { 3680 3681 switch (type) { 3682 case MOD_LOAD: 3683 CTR1(KTR_IGMPV3, "%s: initializing", __func__); 3684 IGMP_LOCK_INIT(); 3685 m_raopt = igmp_ra_alloc(); 3686 netisr_register(&igmp_nh); 3687 break; 3688 case MOD_UNLOAD: 3689 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3690 netisr_unregister(&igmp_nh); 3691 m_free(m_raopt); 3692 m_raopt = NULL; 3693 IGMP_LOCK_DESTROY(); 3694 break; 3695 default: 3696 return (EOPNOTSUPP); 3697 } 3698 return (0); 3699 } 3700 3701 static moduledata_t igmp_mod = { 3702 "igmp", 3703 igmp_modevent, 3704 0 3705 }; 3706 DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE); 3707