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/kernel.h> 64 #include <sys/lock.h> 65 #include <sys/sysctl.h> 66 #include <sys/ktr.h> 67 #include <sys/condvar.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #endif 72 73 #include <net/if.h> 74 #include <net/if_var.h> 75 #include <net/netisr.h> 76 #include <net/vnet.h> 77 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 #include <netinet/in_systm.h> 81 #include <netinet/ip.h> 82 #include <netinet/ip_var.h> 83 #include <netinet/ip_options.h> 84 #include <netinet/igmp.h> 85 #include <netinet/igmp_var.h> 86 87 #include <machine/in_cksum.h> 88 89 #include <security/mac/mac_framework.h> 90 91 #ifndef KTR_IGMPV3 92 #define KTR_IGMPV3 KTR_INET 93 #endif 94 95 #define IGMP_SLOWHZ 2 /* 2 slow timeouts per second */ 96 #define IGMP_FASTHZ 5 /* 5 fast timeouts per second */ 97 #define IGMP_RESPONSE_BURST_INTERVAL (IGMP_FASTHZ / 2) 98 99 static struct igmp_ifsoftc * 100 igi_alloc_locked(struct ifnet *); 101 static void igi_delete_locked(const struct ifnet *); 102 static void igmp_dispatch_queue(struct mbufq *, int, const int); 103 static void igmp_fasttimo_vnet(void); 104 static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 105 static int igmp_handle_state_change(struct in_multi *, 106 struct igmp_ifsoftc *); 107 static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 108 static int igmp_input_v1_query(struct ifnet *, const struct ip *, 109 const struct igmp *); 110 static int igmp_input_v2_query(struct ifnet *, const struct ip *, 111 const struct igmp *); 112 static int igmp_input_v3_query(struct ifnet *, const struct ip *, 113 /*const*/ struct igmpv3 *); 114 static int igmp_input_v3_group_query(struct in_multi *, 115 struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 116 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 117 /*const*/ struct igmp *); 118 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 119 /*const*/ struct igmp *); 120 static void igmp_intr(struct mbuf *); 121 static int igmp_isgroupreported(const struct in_addr); 122 static struct mbuf * 123 igmp_ra_alloc(void); 124 #ifdef KTR 125 static char * igmp_rec_type_to_str(const int); 126 #endif 127 static void igmp_set_version(struct igmp_ifsoftc *, const int); 128 static void igmp_slowtimo_vnet(void); 129 static int igmp_v1v2_queue_report(struct in_multi *, const int); 130 static void igmp_v1v2_process_group_timer(struct in_multi *, const int); 131 static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 132 static void igmp_v2_update_group(struct in_multi *, const int); 133 static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 134 static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 135 static struct mbuf * 136 igmp_v3_encap_report(struct ifnet *, struct mbuf *); 137 static int igmp_v3_enqueue_group_record(struct mbufq *, 138 struct in_multi *, const int, const int, const int); 139 static int igmp_v3_enqueue_filter_change(struct mbufq *, 140 struct in_multi *); 141 static void igmp_v3_process_group_timers(struct in_multi_head *, 142 struct mbufq *, struct mbufq *, struct in_multi *, 143 const int); 144 static int igmp_v3_merge_state_changes(struct in_multi *, 145 struct mbufq *); 146 static void igmp_v3_suppress_group_record(struct in_multi *); 147 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 148 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 149 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 150 static int sysctl_igmp_stat(SYSCTL_HANDLER_ARGS); 151 152 static const struct netisr_handler igmp_nh = { 153 .nh_name = "igmp", 154 .nh_handler = igmp_intr, 155 .nh_proto = NETISR_IGMP, 156 .nh_policy = NETISR_POLICY_SOURCE, 157 }; 158 159 /* 160 * System-wide globals. 161 * 162 * Unlocked access to these is OK, except for the global IGMP output 163 * queue. The IGMP subsystem lock ends up being system-wide for the moment, 164 * because all VIMAGEs have to share a global output queue, as netisrs 165 * themselves are not virtualized. 166 * 167 * Locking: 168 * * The permitted lock order is: IN_MULTI_LIST_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 169 * Any may be taken independently; if any are held at the same 170 * time, the above lock order must be followed. 171 * * All output is delegated to the netisr. 172 * Now that Giant has been eliminated, the netisr may be inlined. 173 * * IN_MULTI_LIST_LOCK covers in_multi. 174 * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 175 * including the output queue. 176 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 177 * per-link state iterators. 178 * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 179 * therefore it is not refcounted. 180 * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 181 * 182 * Reference counting 183 * * IGMP acquires its own reference every time an in_multi is passed to 184 * it and the group is being joined for the first time. 185 * * IGMP releases its reference(s) on in_multi in a deferred way, 186 * because the operations which process the release run as part of 187 * a loop whose control variables are directly affected by the release 188 * (that, and not recursing on the IF_ADDR_LOCK). 189 * 190 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 191 * to a vnet in ifp->if_vnet. 192 * 193 * SMPng: XXX We may potentially race operations on ifma_protospec. 194 * The problem is that we currently lack a clean way of taking the 195 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 196 * as anything which modifies ifma needs to be covered by that lock. 197 * So check for ifma_protospec being NULL before proceeding. 198 */ 199 struct mtx igmp_mtx; 200 201 struct mbuf *m_raopt; /* Router Alert option */ 202 static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 203 204 /* 205 * VIMAGE-wide globals. 206 * 207 * The IGMPv3 timers themselves need to run per-image, however, for 208 * historical reasons, timers run globally. This needs to be improved. 209 * An ifnet can only be in one vimage at a time, and the loopback 210 * ifnet, loif, is itself virtualized. 211 * It would otherwise be possible to seriously hose IGMP state, 212 * and create inconsistencies in upstream multicast routing, if you have 213 * multiple VIMAGEs running on the same link joining different multicast 214 * groups, UNLESS the "primary IP address" is different. This is because 215 * IGMP for IPv4 does not force link-local addresses to be used for each 216 * node, unlike MLD for IPv6. 217 * Obviously the IGMPv3 per-interface state has per-vimage granularity 218 * also as a result. 219 * 220 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 221 * policy to control the address used by IGMP on the link. 222 */ 223 VNET_DEFINE_STATIC(int, interface_timers_running); /* IGMPv3 general 224 * query response */ 225 VNET_DEFINE_STATIC(int, state_change_timers_running); /* IGMPv3 state-change 226 * retransmit */ 227 VNET_DEFINE_STATIC(int, current_state_timers_running); /* IGMPv1/v2 host 228 * report; IGMPv3 g/sg 229 * query response */ 230 231 #define V_interface_timers_running VNET(interface_timers_running) 232 #define V_state_change_timers_running VNET(state_change_timers_running) 233 #define V_current_state_timers_running VNET(current_state_timers_running) 234 235 VNET_PCPUSTAT_DEFINE(struct igmpstat, igmpstat); 236 VNET_PCPUSTAT_SYSINIT(igmpstat); 237 VNET_PCPUSTAT_SYSUNINIT(igmpstat); 238 239 VNET_DEFINE_STATIC(LIST_HEAD(, igmp_ifsoftc), igi_head) = 240 LIST_HEAD_INITIALIZER(igi_head); 241 VNET_DEFINE_STATIC(struct timeval, igmp_gsrdelay) = {10, 0}; 242 243 #define V_igi_head VNET(igi_head) 244 #define V_igmp_gsrdelay VNET(igmp_gsrdelay) 245 246 VNET_DEFINE_STATIC(int, igmp_recvifkludge) = 1; 247 VNET_DEFINE_STATIC(int, igmp_sendra) = 1; 248 VNET_DEFINE_STATIC(int, igmp_sendlocal) = 1; 249 VNET_DEFINE_STATIC(int, igmp_v1enable) = 1; 250 VNET_DEFINE_STATIC(int, igmp_v2enable) = 1; 251 VNET_DEFINE_STATIC(int, igmp_legacysupp); 252 VNET_DEFINE_STATIC(int, igmp_default_version) = IGMP_VERSION_3; 253 254 #define V_igmp_recvifkludge VNET(igmp_recvifkludge) 255 #define V_igmp_sendra VNET(igmp_sendra) 256 #define V_igmp_sendlocal VNET(igmp_sendlocal) 257 #define V_igmp_v1enable VNET(igmp_v1enable) 258 #define V_igmp_v2enable VNET(igmp_v2enable) 259 #define V_igmp_legacysupp VNET(igmp_legacysupp) 260 #define V_igmp_default_version VNET(igmp_default_version) 261 262 /* 263 * Virtualized sysctls. 264 */ 265 SYSCTL_PROC(_net_inet_igmp, IGMPCTL_STATS, stats, 266 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_MPSAFE, 267 &VNET_NAME(igmpstat), 0, sysctl_igmp_stat, "S,igmpstat", 268 "IGMP statistics (struct igmpstat, netinet/igmp_var.h)"); 269 SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 270 &VNET_NAME(igmp_recvifkludge), 0, 271 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 272 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 273 &VNET_NAME(igmp_sendra), 0, 274 "Send IP Router Alert option in IGMPv2/v3 messages"); 275 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 276 &VNET_NAME(igmp_sendlocal), 0, 277 "Send IGMP membership reports for 224.0.0.0/24 groups"); 278 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 279 &VNET_NAME(igmp_v1enable), 0, 280 "Enable backwards compatibility with IGMPv1"); 281 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 282 &VNET_NAME(igmp_v2enable), 0, 283 "Enable backwards compatibility with IGMPv2"); 284 SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 285 &VNET_NAME(igmp_legacysupp), 0, 286 "Allow v1/v2 reports to suppress v3 group responses"); 287 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 288 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 289 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 290 "Default version of IGMP to run on each interface"); 291 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 292 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 293 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 294 "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 295 296 /* 297 * Non-virtualized sysctls. 298 */ 299 static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 300 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 301 "Per-interface IGMPv3 state"); 302 303 static __inline void 304 igmp_save_context(struct mbuf *m, struct ifnet *ifp) 305 { 306 307 #ifdef VIMAGE 308 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 309 #endif /* VIMAGE */ 310 m->m_pkthdr.rcvif = ifp; 311 m->m_pkthdr.flowid = ifp->if_index; 312 } 313 314 static __inline void 315 igmp_scrub_context(struct mbuf *m) 316 { 317 318 m->m_pkthdr.PH_loc.ptr = NULL; 319 m->m_pkthdr.flowid = 0; 320 } 321 322 /* 323 * Restore context from a queued IGMP output chain. 324 * Return saved ifindex. 325 * 326 * VIMAGE: The assertion is there to make sure that we 327 * actually called CURVNET_SET() with what's in the mbuf chain. 328 */ 329 static __inline uint32_t 330 igmp_restore_context(struct mbuf *m) 331 { 332 333 #ifdef notyet 334 #if defined(VIMAGE) && defined(INVARIANTS) 335 KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 336 ("%s: called when curvnet was not restored", __func__)); 337 #endif 338 #endif 339 return (m->m_pkthdr.flowid); 340 } 341 342 /* 343 * IGMP statistics. 344 */ 345 static int 346 sysctl_igmp_stat(SYSCTL_HANDLER_ARGS) 347 { 348 struct igmpstat igps0; 349 int error; 350 char *p; 351 352 error = sysctl_wire_old_buffer(req, sizeof(struct igmpstat)); 353 if (error) 354 return (error); 355 356 if (req->oldptr != NULL) { 357 if (req->oldlen < sizeof(struct igmpstat)) 358 error = ENOMEM; 359 else { 360 /* 361 * Copy the counters, and explicitly set the struct's 362 * version and length fields. 363 */ 364 COUNTER_ARRAY_COPY(VNET(igmpstat), &igps0, 365 sizeof(struct igmpstat) / sizeof(uint64_t)); 366 igps0.igps_version = IGPS_VERSION_3; 367 igps0.igps_len = IGPS_VERSION3_LEN; 368 error = SYSCTL_OUT(req, &igps0, 369 sizeof(struct igmpstat)); 370 } 371 } else 372 req->validlen = sizeof(struct igmpstat); 373 if (error) 374 goto out; 375 if (req->newptr != NULL) { 376 if (req->newlen < sizeof(struct igmpstat)) 377 error = ENOMEM; 378 else 379 error = SYSCTL_IN(req, &igps0, 380 sizeof(igps0)); 381 if (error) 382 goto out; 383 /* 384 * igps0 must be "all zero". 385 */ 386 p = (char *)&igps0; 387 while (p < (char *)&igps0 + sizeof(igps0) && *p == '\0') 388 p++; 389 if (p != (char *)&igps0 + sizeof(igps0)) { 390 error = EINVAL; 391 goto out; 392 } 393 COUNTER_ARRAY_ZERO(VNET(igmpstat), 394 sizeof(struct igmpstat) / sizeof(uint64_t)); 395 } 396 out: 397 return (error); 398 } 399 400 /* 401 * Retrieve or set default IGMP version. 402 * 403 * VIMAGE: Assume curvnet set by caller. 404 * SMPng: NOTE: Serialized by IGMP lock. 405 */ 406 static int 407 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 408 { 409 int error; 410 int new; 411 412 error = sysctl_wire_old_buffer(req, sizeof(int)); 413 if (error) 414 return (error); 415 416 IGMP_LOCK(); 417 418 new = V_igmp_default_version; 419 420 error = sysctl_handle_int(oidp, &new, 0, req); 421 if (error || !req->newptr) 422 goto out_locked; 423 424 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 425 error = EINVAL; 426 goto out_locked; 427 } 428 429 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 430 V_igmp_default_version, new); 431 432 V_igmp_default_version = new; 433 434 out_locked: 435 IGMP_UNLOCK(); 436 return (error); 437 } 438 439 /* 440 * Retrieve or set threshold between group-source queries in seconds. 441 * 442 * VIMAGE: Assume curvnet set by caller. 443 * SMPng: NOTE: Serialized by IGMP lock. 444 */ 445 static int 446 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 447 { 448 int error; 449 int i; 450 451 error = sysctl_wire_old_buffer(req, sizeof(int)); 452 if (error) 453 return (error); 454 455 IGMP_LOCK(); 456 457 i = V_igmp_gsrdelay.tv_sec; 458 459 error = sysctl_handle_int(oidp, &i, 0, req); 460 if (error || !req->newptr) 461 goto out_locked; 462 463 if (i < -1 || i >= 60) { 464 error = EINVAL; 465 goto out_locked; 466 } 467 468 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 469 V_igmp_gsrdelay.tv_sec, i); 470 V_igmp_gsrdelay.tv_sec = i; 471 472 out_locked: 473 IGMP_UNLOCK(); 474 return (error); 475 } 476 477 /* 478 * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 479 * For use by ifmcstat(8). 480 * 481 * SMPng: NOTE: Does an unlocked ifindex space read. 482 * VIMAGE: Assume curvnet set by caller. The node handler itself 483 * is not directly virtualized. 484 */ 485 static int 486 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 487 { 488 struct epoch_tracker et; 489 int *name; 490 int error; 491 u_int namelen; 492 struct ifnet *ifp; 493 struct igmp_ifsoftc *igi; 494 495 name = (int *)arg1; 496 namelen = arg2; 497 498 if (req->newptr != NULL) 499 return (EPERM); 500 501 if (namelen != 1) 502 return (EINVAL); 503 504 error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo)); 505 if (error) 506 return (error); 507 508 IN_MULTI_LIST_LOCK(); 509 IGMP_LOCK(); 510 511 error = ENOENT; 512 513 NET_EPOCH_ENTER(et); 514 ifp = ifnet_byindex(name[0]); 515 NET_EPOCH_EXIT(et); 516 if (ifp == NULL) 517 goto out_locked; 518 519 LIST_FOREACH(igi, &V_igi_head, igi_link) { 520 if (ifp == igi->igi_ifp) { 521 struct igmp_ifinfo info; 522 523 info.igi_version = igi->igi_version; 524 info.igi_v1_timer = igi->igi_v1_timer; 525 info.igi_v2_timer = igi->igi_v2_timer; 526 info.igi_v3_timer = igi->igi_v3_timer; 527 info.igi_flags = igi->igi_flags; 528 info.igi_rv = igi->igi_rv; 529 info.igi_qi = igi->igi_qi; 530 info.igi_qri = igi->igi_qri; 531 info.igi_uri = igi->igi_uri; 532 error = SYSCTL_OUT(req, &info, sizeof(info)); 533 break; 534 } 535 } 536 537 out_locked: 538 IGMP_UNLOCK(); 539 IN_MULTI_LIST_UNLOCK(); 540 return (error); 541 } 542 543 /* 544 * Dispatch an entire queue of pending packet chains 545 * using the netisr. 546 * VIMAGE: Assumes the vnet pointer has been set. 547 */ 548 static void 549 igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 550 { 551 struct epoch_tracker et; 552 struct mbuf *m; 553 554 NET_EPOCH_ENTER(et); 555 while ((m = mbufq_dequeue(mq)) != NULL) { 556 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 557 if (loop) 558 m->m_flags |= M_IGMP_LOOP; 559 netisr_dispatch(NETISR_IGMP, m); 560 if (--limit == 0) 561 break; 562 } 563 NET_EPOCH_EXIT(et); 564 } 565 566 /* 567 * Filter outgoing IGMP report state by group. 568 * 569 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 570 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 571 * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 572 * this may break certain IGMP snooping switches which rely on the old 573 * report behaviour. 574 * 575 * Return zero if the given group is one for which IGMP reports 576 * should be suppressed, or non-zero if reports should be issued. 577 */ 578 static __inline int 579 igmp_isgroupreported(const struct in_addr addr) 580 { 581 582 if (in_allhosts(addr) || 583 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 584 return (0); 585 586 return (1); 587 } 588 589 /* 590 * Construct a Router Alert option to use in outgoing packets. 591 */ 592 static struct mbuf * 593 igmp_ra_alloc(void) 594 { 595 struct mbuf *m; 596 struct ipoption *p; 597 598 m = m_get(M_WAITOK, MT_DATA); 599 p = mtod(m, struct ipoption *); 600 p->ipopt_dst.s_addr = INADDR_ANY; 601 p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 602 p->ipopt_list[1] = 0x04; /* 4 bytes long */ 603 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 604 p->ipopt_list[3] = 0x00; /* pad byte */ 605 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 606 607 return (m); 608 } 609 610 /* 611 * Attach IGMP when PF_INET is attached to an interface. 612 */ 613 struct igmp_ifsoftc * 614 igmp_domifattach(struct ifnet *ifp) 615 { 616 struct igmp_ifsoftc *igi; 617 618 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 619 __func__, ifp, ifp->if_xname); 620 621 IGMP_LOCK(); 622 623 igi = igi_alloc_locked(ifp); 624 if (!(ifp->if_flags & IFF_MULTICAST)) 625 igi->igi_flags |= IGIF_SILENT; 626 627 IGMP_UNLOCK(); 628 629 return (igi); 630 } 631 632 /* 633 * VIMAGE: assume curvnet set by caller. 634 */ 635 static struct igmp_ifsoftc * 636 igi_alloc_locked(/*const*/ struct ifnet *ifp) 637 { 638 struct igmp_ifsoftc *igi; 639 640 IGMP_LOCK_ASSERT(); 641 642 igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 643 if (igi == NULL) 644 goto out; 645 646 igi->igi_ifp = ifp; 647 igi->igi_version = V_igmp_default_version; 648 igi->igi_flags = 0; 649 igi->igi_rv = IGMP_RV_INIT; 650 igi->igi_qi = IGMP_QI_INIT; 651 igi->igi_qri = IGMP_QRI_INIT; 652 igi->igi_uri = IGMP_URI_INIT; 653 mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 654 655 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 656 657 CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 658 ifp, ifp->if_xname); 659 660 out: 661 return (igi); 662 } 663 664 /* 665 * Hook for ifdetach. 666 * 667 * NOTE: Some finalization tasks need to run before the protocol domain 668 * is detached, but also before the link layer does its cleanup. 669 * 670 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 671 * XXX This is also bitten by unlocked ifma_protospec access. 672 */ 673 void 674 igmp_ifdetach(struct ifnet *ifp) 675 { 676 struct epoch_tracker et; 677 struct igmp_ifsoftc *igi; 678 struct ifmultiaddr *ifma; 679 struct in_multi *inm; 680 struct in_multi_head inm_free_tmp; 681 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 682 ifp->if_xname); 683 684 SLIST_INIT(&inm_free_tmp); 685 IGMP_LOCK(); 686 687 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 688 if (igi->igi_version == IGMP_VERSION_3) { 689 IF_ADDR_WLOCK(ifp); 690 NET_EPOCH_ENTER(et); 691 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 692 inm = inm_ifmultiaddr_get_inm(ifma); 693 if (inm == NULL) 694 continue; 695 if (inm->inm_state == IGMP_LEAVING_MEMBER) 696 inm_rele_locked(&inm_free_tmp, inm); 697 inm_clear_recorded(inm); 698 } 699 NET_EPOCH_EXIT(et); 700 IF_ADDR_WUNLOCK(ifp); 701 inm_release_list_deferred(&inm_free_tmp); 702 } 703 IGMP_UNLOCK(); 704 705 } 706 707 /* 708 * Hook for domifdetach. 709 */ 710 void 711 igmp_domifdetach(struct ifnet *ifp) 712 { 713 714 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 715 __func__, ifp, ifp->if_xname); 716 717 IGMP_LOCK(); 718 igi_delete_locked(ifp); 719 IGMP_UNLOCK(); 720 } 721 722 static void 723 igi_delete_locked(const struct ifnet *ifp) 724 { 725 struct igmp_ifsoftc *igi, *tigi; 726 727 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 728 __func__, ifp, ifp->if_xname); 729 730 IGMP_LOCK_ASSERT(); 731 732 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 733 if (igi->igi_ifp == ifp) { 734 /* 735 * Free deferred General Query responses. 736 */ 737 mbufq_drain(&igi->igi_gq); 738 739 LIST_REMOVE(igi, igi_link); 740 free(igi, M_IGMP); 741 return; 742 } 743 } 744 } 745 746 /* 747 * Process a received IGMPv1 query. 748 * Return non-zero if the message should be dropped. 749 * 750 * VIMAGE: The curvnet pointer is derived from the input ifp. 751 */ 752 static int 753 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 754 const struct igmp *igmp) 755 { 756 struct ifmultiaddr *ifma; 757 struct igmp_ifsoftc *igi; 758 struct in_multi *inm; 759 760 NET_EPOCH_ASSERT(); 761 762 /* 763 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 764 * 224.0.0.1. They are always treated as General Queries. 765 * igmp_group is always ignored. Do not drop it as a userland 766 * daemon may wish to see it. 767 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 768 */ 769 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 770 IGMPSTAT_INC(igps_rcv_badqueries); 771 return (0); 772 } 773 IGMPSTAT_INC(igps_rcv_gen_queries); 774 775 IN_MULTI_LIST_LOCK(); 776 IGMP_LOCK(); 777 778 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 779 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 780 781 if (igi->igi_flags & IGIF_LOOPBACK) { 782 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 783 ifp, ifp->if_xname); 784 goto out_locked; 785 } 786 787 /* 788 * Switch to IGMPv1 host compatibility mode. 789 */ 790 igmp_set_version(igi, IGMP_VERSION_1); 791 792 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 793 794 /* 795 * Start the timers in all of our group records 796 * for the interface on which the query arrived, 797 * except those which are already running. 798 */ 799 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 800 inm = inm_ifmultiaddr_get_inm(ifma); 801 if (inm == NULL) 802 continue; 803 if (inm->inm_timer != 0) 804 continue; 805 switch (inm->inm_state) { 806 case IGMP_NOT_MEMBER: 807 case IGMP_SILENT_MEMBER: 808 break; 809 case IGMP_G_QUERY_PENDING_MEMBER: 810 case IGMP_SG_QUERY_PENDING_MEMBER: 811 case IGMP_REPORTING_MEMBER: 812 case IGMP_IDLE_MEMBER: 813 case IGMP_LAZY_MEMBER: 814 case IGMP_SLEEPING_MEMBER: 815 case IGMP_AWAKENING_MEMBER: 816 inm->inm_state = IGMP_REPORTING_MEMBER; 817 inm->inm_timer = IGMP_RANDOM_DELAY( 818 IGMP_V1V2_MAX_RI * IGMP_FASTHZ); 819 V_current_state_timers_running = 1; 820 break; 821 case IGMP_LEAVING_MEMBER: 822 break; 823 } 824 } 825 826 out_locked: 827 IGMP_UNLOCK(); 828 IN_MULTI_LIST_UNLOCK(); 829 830 return (0); 831 } 832 833 /* 834 * Process a received IGMPv2 general or group-specific query. 835 */ 836 static int 837 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 838 const struct igmp *igmp) 839 { 840 struct ifmultiaddr *ifma; 841 struct igmp_ifsoftc *igi; 842 struct in_multi *inm; 843 int is_general_query; 844 uint16_t timer; 845 846 NET_EPOCH_ASSERT(); 847 848 is_general_query = 0; 849 850 /* 851 * Validate address fields upfront. 852 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 853 */ 854 if (in_nullhost(igmp->igmp_group)) { 855 /* 856 * IGMPv2 General Query. 857 * If this was not sent to the all-hosts group, ignore it. 858 */ 859 if (!in_allhosts(ip->ip_dst)) 860 return (0); 861 IGMPSTAT_INC(igps_rcv_gen_queries); 862 is_general_query = 1; 863 } else { 864 /* IGMPv2 Group-Specific Query. */ 865 IGMPSTAT_INC(igps_rcv_group_queries); 866 } 867 868 IN_MULTI_LIST_LOCK(); 869 IGMP_LOCK(); 870 871 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 872 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 873 874 if (igi->igi_flags & IGIF_LOOPBACK) { 875 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 876 ifp, ifp->if_xname); 877 goto out_locked; 878 } 879 880 /* 881 * Ignore v2 query if in v1 Compatibility Mode. 882 */ 883 if (igi->igi_version == IGMP_VERSION_1) 884 goto out_locked; 885 886 igmp_set_version(igi, IGMP_VERSION_2); 887 888 timer = igmp->igmp_code * IGMP_FASTHZ / IGMP_TIMER_SCALE; 889 if (timer == 0) 890 timer = 1; 891 892 if (is_general_query) { 893 /* 894 * For each reporting group joined on this 895 * interface, kick the report timer. 896 */ 897 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 898 ifp, ifp->if_xname); 899 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 900 inm = inm_ifmultiaddr_get_inm(ifma); 901 if (inm == NULL) 902 continue; 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 * IGMP_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 in_ifaddr *ia; 1258 struct in_multi *inm; 1259 1260 IGMPSTAT_INC(igps_rcv_reports); 1261 1262 if (ifp->if_flags & IFF_LOOPBACK) 1263 return (0); 1264 1265 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1266 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1267 IGMPSTAT_INC(igps_rcv_badreports); 1268 return (EINVAL); 1269 } 1270 1271 /* 1272 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1273 * Booting clients may use the source address 0.0.0.0. Some 1274 * IGMP daemons may not know how to use IP_RECVIF to determine 1275 * the interface upon which this message was received. 1276 * Replace 0.0.0.0 with the subnet address if told to do so. 1277 */ 1278 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1279 IFP_TO_IA(ifp, ia); 1280 if (ia != NULL) 1281 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1282 } 1283 1284 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1285 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1286 1287 /* 1288 * IGMPv1 report suppression. 1289 * If we are a member of this group, and our membership should be 1290 * reported, stop our group timer and transition to the 'lazy' state. 1291 */ 1292 IN_MULTI_LIST_LOCK(); 1293 inm = inm_lookup(ifp, igmp->igmp_group); 1294 if (inm != NULL) { 1295 struct igmp_ifsoftc *igi; 1296 1297 igi = inm->inm_igi; 1298 if (igi == NULL) { 1299 KASSERT(igi != NULL, 1300 ("%s: no igi for ifp %p", __func__, ifp)); 1301 goto out_locked; 1302 } 1303 1304 IGMPSTAT_INC(igps_rcv_ourreports); 1305 1306 /* 1307 * If we are in IGMPv3 host mode, do not allow the 1308 * other host's IGMPv1 report to suppress our reports 1309 * unless explicitly configured to do so. 1310 */ 1311 if (igi->igi_version == IGMP_VERSION_3) { 1312 if (V_igmp_legacysupp) 1313 igmp_v3_suppress_group_record(inm); 1314 goto out_locked; 1315 } 1316 1317 inm->inm_timer = 0; 1318 1319 switch (inm->inm_state) { 1320 case IGMP_NOT_MEMBER: 1321 case IGMP_SILENT_MEMBER: 1322 break; 1323 case IGMP_IDLE_MEMBER: 1324 case IGMP_LAZY_MEMBER: 1325 case IGMP_AWAKENING_MEMBER: 1326 CTR3(KTR_IGMPV3, 1327 "report suppressed for 0x%08x on ifp %p(%s)", 1328 ntohl(igmp->igmp_group.s_addr), ifp, 1329 ifp->if_xname); 1330 case IGMP_SLEEPING_MEMBER: 1331 inm->inm_state = IGMP_SLEEPING_MEMBER; 1332 break; 1333 case IGMP_REPORTING_MEMBER: 1334 CTR3(KTR_IGMPV3, 1335 "report suppressed for 0x%08x on ifp %p(%s)", 1336 ntohl(igmp->igmp_group.s_addr), ifp, 1337 ifp->if_xname); 1338 if (igi->igi_version == IGMP_VERSION_1) 1339 inm->inm_state = IGMP_LAZY_MEMBER; 1340 else if (igi->igi_version == IGMP_VERSION_2) 1341 inm->inm_state = IGMP_SLEEPING_MEMBER; 1342 break; 1343 case IGMP_G_QUERY_PENDING_MEMBER: 1344 case IGMP_SG_QUERY_PENDING_MEMBER: 1345 case IGMP_LEAVING_MEMBER: 1346 break; 1347 } 1348 } 1349 1350 out_locked: 1351 IN_MULTI_LIST_UNLOCK(); 1352 1353 return (0); 1354 } 1355 1356 /* 1357 * Process a received IGMPv2 host membership report. 1358 * 1359 * NOTE: 0.0.0.0 workaround breaks const correctness. 1360 */ 1361 static int 1362 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1363 /*const*/ struct igmp *igmp) 1364 { 1365 struct in_ifaddr *ia; 1366 struct in_multi *inm; 1367 1368 /* 1369 * Make sure we don't hear our own membership report. Fast 1370 * leave requires knowing that we are the only member of a 1371 * group. 1372 */ 1373 IFP_TO_IA(ifp, ia); 1374 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1375 return (0); 1376 } 1377 1378 IGMPSTAT_INC(igps_rcv_reports); 1379 1380 if (ifp->if_flags & IFF_LOOPBACK) { 1381 return (0); 1382 } 1383 1384 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1385 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1386 IGMPSTAT_INC(igps_rcv_badreports); 1387 return (EINVAL); 1388 } 1389 1390 /* 1391 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1392 * Booting clients may use the source address 0.0.0.0. Some 1393 * IGMP daemons may not know how to use IP_RECVIF to determine 1394 * the interface upon which this message was received. 1395 * Replace 0.0.0.0 with the subnet address if told to do so. 1396 */ 1397 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1398 if (ia != NULL) 1399 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1400 } 1401 1402 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1403 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1404 1405 /* 1406 * IGMPv2 report suppression. 1407 * If we are a member of this group, and our membership should be 1408 * reported, and our group timer is pending or about to be reset, 1409 * stop our group timer by transitioning to the 'lazy' state. 1410 */ 1411 IN_MULTI_LIST_LOCK(); 1412 inm = inm_lookup(ifp, igmp->igmp_group); 1413 if (inm != NULL) { 1414 struct igmp_ifsoftc *igi; 1415 1416 igi = inm->inm_igi; 1417 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1418 1419 IGMPSTAT_INC(igps_rcv_ourreports); 1420 1421 /* 1422 * If we are in IGMPv3 host mode, do not allow the 1423 * other host's IGMPv1 report to suppress our reports 1424 * unless explicitly configured to do so. 1425 */ 1426 if (igi->igi_version == IGMP_VERSION_3) { 1427 if (V_igmp_legacysupp) 1428 igmp_v3_suppress_group_record(inm); 1429 goto out_locked; 1430 } 1431 1432 inm->inm_timer = 0; 1433 1434 switch (inm->inm_state) { 1435 case IGMP_NOT_MEMBER: 1436 case IGMP_SILENT_MEMBER: 1437 case IGMP_SLEEPING_MEMBER: 1438 break; 1439 case IGMP_REPORTING_MEMBER: 1440 case IGMP_IDLE_MEMBER: 1441 case IGMP_AWAKENING_MEMBER: 1442 CTR3(KTR_IGMPV3, 1443 "report suppressed for 0x%08x on ifp %p(%s)", 1444 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1445 case IGMP_LAZY_MEMBER: 1446 inm->inm_state = IGMP_LAZY_MEMBER; 1447 break; 1448 case IGMP_G_QUERY_PENDING_MEMBER: 1449 case IGMP_SG_QUERY_PENDING_MEMBER: 1450 case IGMP_LEAVING_MEMBER: 1451 break; 1452 } 1453 } 1454 1455 out_locked: 1456 IN_MULTI_LIST_UNLOCK(); 1457 1458 return (0); 1459 } 1460 1461 int 1462 igmp_input(struct mbuf **mp, int *offp, int proto) 1463 { 1464 int iphlen; 1465 struct ifnet *ifp; 1466 struct igmp *igmp; 1467 struct ip *ip; 1468 struct mbuf *m; 1469 int igmplen; 1470 int minlen; 1471 int queryver; 1472 1473 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1474 1475 m = *mp; 1476 ifp = m->m_pkthdr.rcvif; 1477 *mp = NULL; 1478 1479 IGMPSTAT_INC(igps_rcv_total); 1480 1481 ip = mtod(m, struct ip *); 1482 iphlen = *offp; 1483 igmplen = ntohs(ip->ip_len) - iphlen; 1484 1485 /* 1486 * Validate lengths. 1487 */ 1488 if (igmplen < IGMP_MINLEN) { 1489 IGMPSTAT_INC(igps_rcv_tooshort); 1490 m_freem(m); 1491 return (IPPROTO_DONE); 1492 } 1493 1494 /* 1495 * Always pullup to the minimum size for v1/v2 or v3 1496 * to amortize calls to m_pullup(). 1497 */ 1498 minlen = iphlen; 1499 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1500 minlen += IGMP_V3_QUERY_MINLEN; 1501 else 1502 minlen += IGMP_MINLEN; 1503 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1504 (m = m_pullup(m, minlen)) == NULL) { 1505 IGMPSTAT_INC(igps_rcv_tooshort); 1506 return (IPPROTO_DONE); 1507 } 1508 ip = mtod(m, struct ip *); 1509 1510 /* 1511 * Validate checksum. 1512 */ 1513 m->m_data += iphlen; 1514 m->m_len -= iphlen; 1515 igmp = mtod(m, struct igmp *); 1516 if (in_cksum(m, igmplen)) { 1517 IGMPSTAT_INC(igps_rcv_badsum); 1518 m_freem(m); 1519 return (IPPROTO_DONE); 1520 } 1521 m->m_data -= iphlen; 1522 m->m_len += iphlen; 1523 1524 /* 1525 * IGMP control traffic is link-scope, and must have a TTL of 1. 1526 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1527 * probe packets may come from beyond the LAN. 1528 */ 1529 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1530 IGMPSTAT_INC(igps_rcv_badttl); 1531 m_freem(m); 1532 return (IPPROTO_DONE); 1533 } 1534 1535 switch (igmp->igmp_type) { 1536 case IGMP_HOST_MEMBERSHIP_QUERY: 1537 if (igmplen == IGMP_MINLEN) { 1538 if (igmp->igmp_code == 0) 1539 queryver = IGMP_VERSION_1; 1540 else 1541 queryver = IGMP_VERSION_2; 1542 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1543 queryver = IGMP_VERSION_3; 1544 } else { 1545 IGMPSTAT_INC(igps_rcv_tooshort); 1546 m_freem(m); 1547 return (IPPROTO_DONE); 1548 } 1549 1550 switch (queryver) { 1551 case IGMP_VERSION_1: 1552 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1553 if (!V_igmp_v1enable) 1554 break; 1555 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1556 m_freem(m); 1557 return (IPPROTO_DONE); 1558 } 1559 break; 1560 1561 case IGMP_VERSION_2: 1562 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1563 if (!V_igmp_v2enable) 1564 break; 1565 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1566 m_freem(m); 1567 return (IPPROTO_DONE); 1568 } 1569 break; 1570 1571 case IGMP_VERSION_3: { 1572 struct igmpv3 *igmpv3; 1573 uint16_t igmpv3len; 1574 uint16_t nsrc; 1575 1576 IGMPSTAT_INC(igps_rcv_v3_queries); 1577 igmpv3 = (struct igmpv3 *)igmp; 1578 /* 1579 * Validate length based on source count. 1580 */ 1581 nsrc = ntohs(igmpv3->igmp_numsrc); 1582 if (nsrc * sizeof(in_addr_t) > 1583 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1584 IGMPSTAT_INC(igps_rcv_tooshort); 1585 m_freem(m); 1586 return (IPPROTO_DONE); 1587 } 1588 /* 1589 * m_pullup() may modify m, so pullup in 1590 * this scope. 1591 */ 1592 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1593 sizeof(struct in_addr) * nsrc; 1594 if ((!M_WRITABLE(m) || 1595 m->m_len < igmpv3len) && 1596 (m = m_pullup(m, igmpv3len)) == NULL) { 1597 IGMPSTAT_INC(igps_rcv_tooshort); 1598 return (IPPROTO_DONE); 1599 } 1600 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1601 + iphlen); 1602 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1603 m_freem(m); 1604 return (IPPROTO_DONE); 1605 } 1606 } 1607 break; 1608 } 1609 break; 1610 1611 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1612 if (!V_igmp_v1enable) 1613 break; 1614 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1615 m_freem(m); 1616 return (IPPROTO_DONE); 1617 } 1618 break; 1619 1620 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1621 if (!V_igmp_v2enable) 1622 break; 1623 if (!ip_checkrouteralert(m)) 1624 IGMPSTAT_INC(igps_rcv_nora); 1625 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1626 m_freem(m); 1627 return (IPPROTO_DONE); 1628 } 1629 break; 1630 1631 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1632 /* 1633 * Hosts do not need to process IGMPv3 membership reports, 1634 * as report suppression is no longer required. 1635 */ 1636 if (!ip_checkrouteralert(m)) 1637 IGMPSTAT_INC(igps_rcv_nora); 1638 break; 1639 1640 default: 1641 break; 1642 } 1643 1644 /* 1645 * Pass all valid IGMP packets up to any process(es) listening on a 1646 * raw IGMP socket. 1647 */ 1648 *mp = m; 1649 return (rip_input(mp, offp, proto)); 1650 } 1651 1652 /* 1653 * Fast timeout handler (global). 1654 * VIMAGE: Timeout handlers are expected to service all vimages. 1655 */ 1656 static struct callout igmpfast_callout; 1657 static void 1658 igmp_fasttimo(void *arg __unused) 1659 { 1660 struct epoch_tracker et; 1661 VNET_ITERATOR_DECL(vnet_iter); 1662 1663 NET_EPOCH_ENTER(et); 1664 VNET_LIST_RLOCK_NOSLEEP(); 1665 VNET_FOREACH(vnet_iter) { 1666 CURVNET_SET(vnet_iter); 1667 igmp_fasttimo_vnet(); 1668 CURVNET_RESTORE(); 1669 } 1670 VNET_LIST_RUNLOCK_NOSLEEP(); 1671 NET_EPOCH_EXIT(et); 1672 1673 callout_reset(&igmpfast_callout, hz / IGMP_FASTHZ, igmp_fasttimo, NULL); 1674 } 1675 1676 /* 1677 * Fast timeout handler (per-vnet). 1678 * Sends are shuffled off to a netisr to deal with Giant. 1679 * 1680 * VIMAGE: Assume caller has set up our curvnet. 1681 */ 1682 static void 1683 igmp_fasttimo_vnet(void) 1684 { 1685 struct mbufq scq; /* State-change packets */ 1686 struct mbufq qrq; /* Query response packets */ 1687 struct ifnet *ifp; 1688 struct igmp_ifsoftc *igi; 1689 struct ifmultiaddr *ifma; 1690 struct in_multi *inm; 1691 struct in_multi_head inm_free_tmp; 1692 int loop, uri_fasthz; 1693 1694 loop = 0; 1695 uri_fasthz = 0; 1696 1697 /* 1698 * Quick check to see if any work needs to be done, in order to 1699 * minimize the overhead of fasttimo processing. 1700 * SMPng: XXX Unlocked reads. 1701 */ 1702 if (!V_current_state_timers_running && 1703 !V_interface_timers_running && 1704 !V_state_change_timers_running) 1705 return; 1706 1707 SLIST_INIT(&inm_free_tmp); 1708 IN_MULTI_LIST_LOCK(); 1709 IGMP_LOCK(); 1710 1711 /* 1712 * IGMPv3 General Query response timer processing. 1713 */ 1714 if (V_interface_timers_running) { 1715 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1716 1717 V_interface_timers_running = 0; 1718 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1719 if (igi->igi_v3_timer == 0) { 1720 /* Do nothing. */ 1721 } else if (--igi->igi_v3_timer == 0) { 1722 igmp_v3_dispatch_general_query(igi); 1723 } else { 1724 V_interface_timers_running = 1; 1725 } 1726 } 1727 } 1728 1729 if (!V_current_state_timers_running && 1730 !V_state_change_timers_running) 1731 goto out_locked; 1732 1733 V_current_state_timers_running = 0; 1734 V_state_change_timers_running = 0; 1735 1736 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1737 1738 /* 1739 * IGMPv1/v2/v3 host report and state-change timer processing. 1740 * Note: Processing a v3 group timer may remove a node. 1741 */ 1742 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1743 ifp = igi->igi_ifp; 1744 1745 if (igi->igi_version == IGMP_VERSION_3) { 1746 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1747 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1748 IGMP_FASTHZ); 1749 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1750 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1751 } 1752 1753 IF_ADDR_WLOCK(ifp); 1754 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1755 inm = inm_ifmultiaddr_get_inm(ifma); 1756 if (inm == NULL) 1757 continue; 1758 switch (igi->igi_version) { 1759 case IGMP_VERSION_1: 1760 case IGMP_VERSION_2: 1761 igmp_v1v2_process_group_timer(inm, 1762 igi->igi_version); 1763 break; 1764 case IGMP_VERSION_3: 1765 igmp_v3_process_group_timers(&inm_free_tmp, &qrq, 1766 &scq, inm, uri_fasthz); 1767 break; 1768 } 1769 } 1770 IF_ADDR_WUNLOCK(ifp); 1771 1772 if (igi->igi_version == IGMP_VERSION_3) { 1773 igmp_dispatch_queue(&qrq, 0, loop); 1774 igmp_dispatch_queue(&scq, 0, loop); 1775 1776 /* 1777 * Free the in_multi reference(s) for this 1778 * IGMP lifecycle. 1779 */ 1780 inm_release_list_deferred(&inm_free_tmp); 1781 } 1782 } 1783 1784 out_locked: 1785 IGMP_UNLOCK(); 1786 IN_MULTI_LIST_UNLOCK(); 1787 } 1788 1789 /* 1790 * Update host report group timer for IGMPv1/v2. 1791 * Will update the global pending timer flags. 1792 */ 1793 static void 1794 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1795 { 1796 int report_timer_expired; 1797 1798 IN_MULTI_LIST_LOCK_ASSERT(); 1799 IGMP_LOCK_ASSERT(); 1800 1801 if (inm->inm_timer == 0) { 1802 report_timer_expired = 0; 1803 } else if (--inm->inm_timer == 0) { 1804 report_timer_expired = 1; 1805 } else { 1806 V_current_state_timers_running = 1; 1807 return; 1808 } 1809 1810 switch (inm->inm_state) { 1811 case IGMP_NOT_MEMBER: 1812 case IGMP_SILENT_MEMBER: 1813 case IGMP_IDLE_MEMBER: 1814 case IGMP_LAZY_MEMBER: 1815 case IGMP_SLEEPING_MEMBER: 1816 case IGMP_AWAKENING_MEMBER: 1817 break; 1818 case IGMP_REPORTING_MEMBER: 1819 if (report_timer_expired) { 1820 inm->inm_state = IGMP_IDLE_MEMBER; 1821 (void)igmp_v1v2_queue_report(inm, 1822 (version == IGMP_VERSION_2) ? 1823 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1824 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1825 } 1826 break; 1827 case IGMP_G_QUERY_PENDING_MEMBER: 1828 case IGMP_SG_QUERY_PENDING_MEMBER: 1829 case IGMP_LEAVING_MEMBER: 1830 break; 1831 } 1832 } 1833 1834 /* 1835 * Update a group's timers for IGMPv3. 1836 * Will update the global pending timer flags. 1837 * Note: Unlocked read from igi. 1838 */ 1839 static void 1840 igmp_v3_process_group_timers(struct in_multi_head *inmh, 1841 struct mbufq *qrq, struct mbufq *scq, 1842 struct in_multi *inm, const int uri_fasthz) 1843 { 1844 int query_response_timer_expired; 1845 int state_change_retransmit_timer_expired; 1846 1847 IN_MULTI_LIST_LOCK_ASSERT(); 1848 IGMP_LOCK_ASSERT(); 1849 1850 query_response_timer_expired = 0; 1851 state_change_retransmit_timer_expired = 0; 1852 1853 /* 1854 * During a transition from v1/v2 compatibility mode back to v3, 1855 * a group record in REPORTING state may still have its group 1856 * timer active. This is a no-op in this function; it is easier 1857 * to deal with it here than to complicate the slow-timeout path. 1858 */ 1859 if (inm->inm_timer == 0) { 1860 query_response_timer_expired = 0; 1861 } else if (--inm->inm_timer == 0) { 1862 query_response_timer_expired = 1; 1863 } else { 1864 V_current_state_timers_running = 1; 1865 } 1866 1867 if (inm->inm_sctimer == 0) { 1868 state_change_retransmit_timer_expired = 0; 1869 } else if (--inm->inm_sctimer == 0) { 1870 state_change_retransmit_timer_expired = 1; 1871 } else { 1872 V_state_change_timers_running = 1; 1873 } 1874 1875 /* We are in fasttimo, so be quick about it. */ 1876 if (!state_change_retransmit_timer_expired && 1877 !query_response_timer_expired) 1878 return; 1879 1880 switch (inm->inm_state) { 1881 case IGMP_NOT_MEMBER: 1882 case IGMP_SILENT_MEMBER: 1883 case IGMP_SLEEPING_MEMBER: 1884 case IGMP_LAZY_MEMBER: 1885 case IGMP_AWAKENING_MEMBER: 1886 case IGMP_IDLE_MEMBER: 1887 break; 1888 case IGMP_G_QUERY_PENDING_MEMBER: 1889 case IGMP_SG_QUERY_PENDING_MEMBER: 1890 /* 1891 * Respond to a previously pending Group-Specific 1892 * or Group-and-Source-Specific query by enqueueing 1893 * the appropriate Current-State report for 1894 * immediate transmission. 1895 */ 1896 if (query_response_timer_expired) { 1897 int retval __unused; 1898 1899 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1900 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1901 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1902 __func__, retval); 1903 inm->inm_state = IGMP_REPORTING_MEMBER; 1904 /* XXX Clear recorded sources for next time. */ 1905 inm_clear_recorded(inm); 1906 } 1907 /* FALLTHROUGH */ 1908 case IGMP_REPORTING_MEMBER: 1909 case IGMP_LEAVING_MEMBER: 1910 if (state_change_retransmit_timer_expired) { 1911 /* 1912 * State-change retransmission timer fired. 1913 * If there are any further pending retransmissions, 1914 * set the global pending state-change flag, and 1915 * reset the timer. 1916 */ 1917 if (--inm->inm_scrv > 0) { 1918 inm->inm_sctimer = uri_fasthz; 1919 V_state_change_timers_running = 1; 1920 } 1921 /* 1922 * Retransmit the previously computed state-change 1923 * report. If there are no further pending 1924 * retransmissions, the mbuf queue will be consumed. 1925 * Update T0 state to T1 as we have now sent 1926 * a state-change. 1927 */ 1928 (void)igmp_v3_merge_state_changes(inm, scq); 1929 1930 inm_commit(inm); 1931 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1932 ntohl(inm->inm_addr.s_addr), 1933 inm->inm_ifp->if_xname); 1934 1935 /* 1936 * If we are leaving the group for good, make sure 1937 * we release IGMP's reference to it. 1938 * This release must be deferred using a SLIST, 1939 * as we are called from a loop which traverses 1940 * the in_ifmultiaddr TAILQ. 1941 */ 1942 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1943 inm->inm_scrv == 0) { 1944 inm->inm_state = IGMP_NOT_MEMBER; 1945 inm_rele_locked(inmh, inm); 1946 } 1947 } 1948 break; 1949 } 1950 } 1951 1952 /* 1953 * Suppress a group's pending response to a group or source/group query. 1954 * 1955 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1956 * Do NOT update ST1/ST0 as this operation merely suppresses 1957 * the currently pending group record. 1958 * Do NOT suppress the response to a general query. It is possible but 1959 * it would require adding another state or flag. 1960 */ 1961 static void 1962 igmp_v3_suppress_group_record(struct in_multi *inm) 1963 { 1964 1965 IN_MULTI_LIST_LOCK_ASSERT(); 1966 1967 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1968 ("%s: not IGMPv3 mode on link", __func__)); 1969 1970 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1971 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1972 return; 1973 1974 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1975 inm_clear_recorded(inm); 1976 1977 inm->inm_timer = 0; 1978 inm->inm_state = IGMP_REPORTING_MEMBER; 1979 } 1980 1981 /* 1982 * Switch to a different IGMP version on the given interface, 1983 * as per Section 7.2.1. 1984 */ 1985 static void 1986 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1987 { 1988 int old_version_timer; 1989 1990 IGMP_LOCK_ASSERT(); 1991 1992 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 1993 version, igi->igi_ifp, igi->igi_ifp->if_xname); 1994 1995 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 1996 /* 1997 * Compute the "Older Version Querier Present" timer as per 1998 * Section 8.12. 1999 */ 2000 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 2001 old_version_timer *= IGMP_SLOWHZ; 2002 2003 if (version == IGMP_VERSION_1) { 2004 igi->igi_v1_timer = old_version_timer; 2005 igi->igi_v2_timer = 0; 2006 } else if (version == IGMP_VERSION_2) { 2007 igi->igi_v1_timer = 0; 2008 igi->igi_v2_timer = old_version_timer; 2009 } 2010 } 2011 2012 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2013 if (igi->igi_version != IGMP_VERSION_2) { 2014 igi->igi_version = IGMP_VERSION_2; 2015 igmp_v3_cancel_link_timers(igi); 2016 } 2017 } else if (igi->igi_v1_timer > 0) { 2018 if (igi->igi_version != IGMP_VERSION_1) { 2019 igi->igi_version = IGMP_VERSION_1; 2020 igmp_v3_cancel_link_timers(igi); 2021 } 2022 } 2023 } 2024 2025 /* 2026 * Cancel pending IGMPv3 timers for the given link and all groups 2027 * joined on it; state-change, general-query, and group-query timers. 2028 * 2029 * Only ever called on a transition from v3 to Compatibility mode. Kill 2030 * the timers stone dead (this may be expensive for large N groups), they 2031 * will be restarted if Compatibility Mode deems that they must be due to 2032 * query processing. 2033 */ 2034 static void 2035 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2036 { 2037 struct ifmultiaddr *ifma; 2038 struct ifnet *ifp; 2039 struct in_multi *inm; 2040 struct in_multi_head inm_free_tmp; 2041 2042 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2043 igi->igi_ifp, igi->igi_ifp->if_xname); 2044 2045 IN_MULTI_LIST_LOCK_ASSERT(); 2046 IGMP_LOCK_ASSERT(); 2047 NET_EPOCH_ASSERT(); 2048 2049 SLIST_INIT(&inm_free_tmp); 2050 2051 /* 2052 * Stop the v3 General Query Response on this link stone dead. 2053 * If fasttimo is woken up due to V_interface_timers_running, 2054 * the flag will be cleared if there are no pending link timers. 2055 */ 2056 igi->igi_v3_timer = 0; 2057 2058 /* 2059 * Now clear the current-state and state-change report timers 2060 * for all memberships scoped to this link. 2061 */ 2062 ifp = igi->igi_ifp; 2063 IF_ADDR_WLOCK(ifp); 2064 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2065 inm = inm_ifmultiaddr_get_inm(ifma); 2066 if (inm == NULL) 2067 continue; 2068 switch (inm->inm_state) { 2069 case IGMP_NOT_MEMBER: 2070 case IGMP_SILENT_MEMBER: 2071 case IGMP_IDLE_MEMBER: 2072 case IGMP_LAZY_MEMBER: 2073 case IGMP_SLEEPING_MEMBER: 2074 case IGMP_AWAKENING_MEMBER: 2075 /* 2076 * These states are either not relevant in v3 mode, 2077 * or are unreported. Do nothing. 2078 */ 2079 break; 2080 case IGMP_LEAVING_MEMBER: 2081 /* 2082 * If we are leaving the group and switching to 2083 * compatibility mode, we need to release the final 2084 * reference held for issuing the INCLUDE {}, and 2085 * transition to REPORTING to ensure the host leave 2086 * message is sent upstream to the old querier -- 2087 * transition to NOT would lose the leave and race. 2088 */ 2089 inm_rele_locked(&inm_free_tmp, inm); 2090 /* FALLTHROUGH */ 2091 case IGMP_G_QUERY_PENDING_MEMBER: 2092 case IGMP_SG_QUERY_PENDING_MEMBER: 2093 inm_clear_recorded(inm); 2094 /* FALLTHROUGH */ 2095 case IGMP_REPORTING_MEMBER: 2096 inm->inm_state = IGMP_REPORTING_MEMBER; 2097 break; 2098 } 2099 /* 2100 * Always clear state-change and group report timers. 2101 * Free any pending IGMPv3 state-change records. 2102 */ 2103 inm->inm_sctimer = 0; 2104 inm->inm_timer = 0; 2105 mbufq_drain(&inm->inm_scq); 2106 } 2107 IF_ADDR_WUNLOCK(ifp); 2108 2109 inm_release_list_deferred(&inm_free_tmp); 2110 } 2111 2112 /* 2113 * Update the Older Version Querier Present timers for a link. 2114 * See Section 7.2.1 of RFC 3376. 2115 */ 2116 static void 2117 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2118 { 2119 2120 IGMP_LOCK_ASSERT(); 2121 2122 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2123 /* 2124 * IGMPv1 and IGMPv2 Querier Present timers expired. 2125 * 2126 * Revert to IGMPv3. 2127 */ 2128 if (igi->igi_version != IGMP_VERSION_3) { 2129 CTR5(KTR_IGMPV3, 2130 "%s: transition from v%d -> v%d on %p(%s)", 2131 __func__, igi->igi_version, IGMP_VERSION_3, 2132 igi->igi_ifp, igi->igi_ifp->if_xname); 2133 igi->igi_version = IGMP_VERSION_3; 2134 } 2135 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2136 /* 2137 * IGMPv1 Querier Present timer expired, 2138 * IGMPv2 Querier Present timer running. 2139 * If IGMPv2 was disabled since last timeout, 2140 * revert to IGMPv3. 2141 * If IGMPv2 is enabled, revert to IGMPv2. 2142 */ 2143 if (!V_igmp_v2enable) { 2144 CTR5(KTR_IGMPV3, 2145 "%s: transition from v%d -> v%d on %p(%s)", 2146 __func__, igi->igi_version, IGMP_VERSION_3, 2147 igi->igi_ifp, igi->igi_ifp->if_xname); 2148 igi->igi_v2_timer = 0; 2149 igi->igi_version = IGMP_VERSION_3; 2150 } else { 2151 --igi->igi_v2_timer; 2152 if (igi->igi_version != IGMP_VERSION_2) { 2153 CTR5(KTR_IGMPV3, 2154 "%s: transition from v%d -> v%d on %p(%s)", 2155 __func__, igi->igi_version, IGMP_VERSION_2, 2156 igi->igi_ifp, igi->igi_ifp->if_xname); 2157 igi->igi_version = IGMP_VERSION_2; 2158 igmp_v3_cancel_link_timers(igi); 2159 } 2160 } 2161 } else if (igi->igi_v1_timer > 0) { 2162 /* 2163 * IGMPv1 Querier Present timer running. 2164 * Stop IGMPv2 timer if running. 2165 * 2166 * If IGMPv1 was disabled since last timeout, 2167 * revert to IGMPv3. 2168 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2169 */ 2170 if (!V_igmp_v1enable) { 2171 CTR5(KTR_IGMPV3, 2172 "%s: transition from v%d -> v%d on %p(%s)", 2173 __func__, igi->igi_version, IGMP_VERSION_3, 2174 igi->igi_ifp, igi->igi_ifp->if_xname); 2175 igi->igi_v1_timer = 0; 2176 igi->igi_version = IGMP_VERSION_3; 2177 } else { 2178 --igi->igi_v1_timer; 2179 } 2180 if (igi->igi_v2_timer > 0) { 2181 CTR3(KTR_IGMPV3, 2182 "%s: cancel v2 timer on %p(%s)", 2183 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2184 igi->igi_v2_timer = 0; 2185 } 2186 } 2187 } 2188 2189 /* 2190 * Global slowtimo handler. 2191 * VIMAGE: Timeout handlers are expected to service all vimages. 2192 */ 2193 static struct callout igmpslow_callout; 2194 static void 2195 igmp_slowtimo(void *arg __unused) 2196 { 2197 struct epoch_tracker et; 2198 VNET_ITERATOR_DECL(vnet_iter); 2199 2200 NET_EPOCH_ENTER(et); 2201 VNET_LIST_RLOCK_NOSLEEP(); 2202 VNET_FOREACH(vnet_iter) { 2203 CURVNET_SET(vnet_iter); 2204 igmp_slowtimo_vnet(); 2205 CURVNET_RESTORE(); 2206 } 2207 VNET_LIST_RUNLOCK_NOSLEEP(); 2208 NET_EPOCH_EXIT(et); 2209 2210 callout_reset(&igmpslow_callout, hz / IGMP_SLOWHZ, igmp_slowtimo, NULL); 2211 } 2212 2213 /* 2214 * Per-vnet slowtimo handler. 2215 */ 2216 static void 2217 igmp_slowtimo_vnet(void) 2218 { 2219 struct igmp_ifsoftc *igi; 2220 2221 IGMP_LOCK(); 2222 2223 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2224 igmp_v1v2_process_querier_timers(igi); 2225 } 2226 2227 IGMP_UNLOCK(); 2228 } 2229 2230 /* 2231 * Dispatch an IGMPv1/v2 host report or leave message. 2232 * These are always small enough to fit inside a single mbuf. 2233 */ 2234 static int 2235 igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2236 { 2237 struct epoch_tracker et; 2238 struct ifnet *ifp; 2239 struct igmp *igmp; 2240 struct ip *ip; 2241 struct mbuf *m; 2242 2243 IN_MULTI_LIST_LOCK_ASSERT(); 2244 IGMP_LOCK_ASSERT(); 2245 2246 ifp = inm->inm_ifp; 2247 2248 m = m_gethdr(M_NOWAIT, MT_DATA); 2249 if (m == NULL) 2250 return (ENOMEM); 2251 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2252 2253 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2254 2255 m->m_data += sizeof(struct ip); 2256 m->m_len = sizeof(struct igmp); 2257 2258 igmp = mtod(m, struct igmp *); 2259 igmp->igmp_type = type; 2260 igmp->igmp_code = 0; 2261 igmp->igmp_group = inm->inm_addr; 2262 igmp->igmp_cksum = 0; 2263 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2264 2265 m->m_data -= sizeof(struct ip); 2266 m->m_len += sizeof(struct ip); 2267 2268 ip = mtod(m, struct ip *); 2269 ip->ip_tos = 0; 2270 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2271 ip->ip_off = 0; 2272 ip->ip_p = IPPROTO_IGMP; 2273 ip->ip_src.s_addr = INADDR_ANY; 2274 2275 if (type == IGMP_HOST_LEAVE_MESSAGE) 2276 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2277 else 2278 ip->ip_dst = inm->inm_addr; 2279 2280 igmp_save_context(m, ifp); 2281 2282 m->m_flags |= M_IGMPV2; 2283 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2284 m->m_flags |= M_IGMP_LOOP; 2285 2286 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2287 NET_EPOCH_ENTER(et); 2288 netisr_dispatch(NETISR_IGMP, m); 2289 NET_EPOCH_EXIT(et); 2290 2291 return (0); 2292 } 2293 2294 /* 2295 * Process a state change from the upper layer for the given IPv4 group. 2296 * 2297 * Each socket holds a reference on the in_multi in its own ip_moptions. 2298 * The socket layer will have made the necessary updates to.the group 2299 * state, it is now up to IGMP to issue a state change report if there 2300 * has been any change between T0 (when the last state-change was issued) 2301 * and T1 (now). 2302 * 2303 * We use the IGMPv3 state machine at group level. The IGMP module 2304 * however makes the decision as to which IGMP protocol version to speak. 2305 * A state change *from* INCLUDE {} always means an initial join. 2306 * A state change *to* INCLUDE {} always means a final leave. 2307 * 2308 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2309 * save ourselves a bunch of work; any exclusive mode groups need not 2310 * compute source filter lists. 2311 * 2312 * VIMAGE: curvnet should have been set by caller, as this routine 2313 * is called from the socket option handlers. 2314 */ 2315 int 2316 igmp_change_state(struct in_multi *inm) 2317 { 2318 struct igmp_ifsoftc *igi; 2319 struct ifnet *ifp; 2320 int error; 2321 2322 error = 0; 2323 IN_MULTI_LOCK_ASSERT(); 2324 /* 2325 * Try to detect if the upper layer just asked us to change state 2326 * for an interface which has now gone away. 2327 */ 2328 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2329 ifp = inm->inm_ifma->ifma_ifp; 2330 if (ifp == NULL) 2331 return (0); 2332 /* 2333 * Sanity check that netinet's notion of ifp is the 2334 * same as net's. 2335 */ 2336 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2337 2338 IGMP_LOCK(); 2339 2340 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2341 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2342 2343 /* 2344 * If we detect a state transition to or from MCAST_UNDEFINED 2345 * for this group, then we are starting or finishing an IGMP 2346 * life cycle for this group. 2347 */ 2348 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2349 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2350 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2351 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2352 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2353 error = igmp_initial_join(inm, igi); 2354 goto out_locked; 2355 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2356 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2357 igmp_final_leave(inm, igi); 2358 goto out_locked; 2359 } 2360 } else { 2361 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2362 } 2363 2364 error = igmp_handle_state_change(inm, igi); 2365 2366 out_locked: 2367 IGMP_UNLOCK(); 2368 return (error); 2369 } 2370 2371 /* 2372 * Perform the initial join for an IGMP group. 2373 * 2374 * When joining a group: 2375 * If the group should have its IGMP traffic suppressed, do nothing. 2376 * IGMPv1 starts sending IGMPv1 host membership reports. 2377 * IGMPv2 starts sending IGMPv2 host membership reports. 2378 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2379 * initial state of the membership. 2380 */ 2381 static int 2382 igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2383 { 2384 struct ifnet *ifp; 2385 struct mbufq *mq; 2386 int error, retval, syncstates; 2387 2388 CTR4(KTR_IGMPV3, "%s: initial join 0x%08x on ifp %p(%s)", __func__, 2389 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2390 2391 error = 0; 2392 syncstates = 1; 2393 2394 ifp = inm->inm_ifp; 2395 2396 IN_MULTI_LOCK_ASSERT(); 2397 IGMP_LOCK_ASSERT(); 2398 2399 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2400 2401 /* 2402 * Groups joined on loopback or marked as 'not reported', 2403 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2404 * are never reported in any IGMP protocol exchanges. 2405 * All other groups enter the appropriate IGMP state machine 2406 * for the version in use on this link. 2407 * A link marked as IGIF_SILENT causes IGMP to be completely 2408 * disabled for the link. 2409 */ 2410 if ((ifp->if_flags & IFF_LOOPBACK) || 2411 (igi->igi_flags & IGIF_SILENT) || 2412 !igmp_isgroupreported(inm->inm_addr)) { 2413 CTR1(KTR_IGMPV3, 2414 "%s: not kicking state machine for silent group", __func__); 2415 inm->inm_state = IGMP_SILENT_MEMBER; 2416 inm->inm_timer = 0; 2417 } else { 2418 /* 2419 * Deal with overlapping in_multi lifecycle. 2420 * If this group was LEAVING, then make sure 2421 * we drop the reference we picked up to keep the 2422 * group around for the final INCLUDE {} enqueue. 2423 */ 2424 if (igi->igi_version == IGMP_VERSION_3 && 2425 inm->inm_state == IGMP_LEAVING_MEMBER) { 2426 MPASS(inm->inm_refcount > 1); 2427 inm_rele_locked(NULL, inm); 2428 } 2429 inm->inm_state = IGMP_REPORTING_MEMBER; 2430 2431 switch (igi->igi_version) { 2432 case IGMP_VERSION_1: 2433 case IGMP_VERSION_2: 2434 inm->inm_state = IGMP_IDLE_MEMBER; 2435 error = igmp_v1v2_queue_report(inm, 2436 (igi->igi_version == IGMP_VERSION_2) ? 2437 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2438 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2439 if (error == 0) { 2440 inm->inm_timer = IGMP_RANDOM_DELAY( 2441 IGMP_V1V2_MAX_RI * IGMP_FASTHZ); 2442 V_current_state_timers_running = 1; 2443 } 2444 break; 2445 2446 case IGMP_VERSION_3: 2447 /* 2448 * Defer update of T0 to T1, until the first copy 2449 * of the state change has been transmitted. 2450 */ 2451 syncstates = 0; 2452 2453 /* 2454 * Immediately enqueue a State-Change Report for 2455 * this interface, freeing any previous reports. 2456 * Don't kick the timers if there is nothing to do, 2457 * or if an error occurred. 2458 */ 2459 mq = &inm->inm_scq; 2460 mbufq_drain(mq); 2461 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2462 0, 0); 2463 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2464 __func__, retval); 2465 if (retval <= 0) { 2466 error = retval * -1; 2467 break; 2468 } 2469 2470 /* 2471 * Schedule transmission of pending state-change 2472 * report up to RV times for this link. The timer 2473 * will fire at the next igmp_fasttimo (~200ms), 2474 * giving us an opportunity to merge the reports. 2475 */ 2476 if (igi->igi_flags & IGIF_LOOPBACK) { 2477 inm->inm_scrv = 1; 2478 } else { 2479 KASSERT(igi->igi_rv > 1, 2480 ("%s: invalid robustness %d", __func__, 2481 igi->igi_rv)); 2482 inm->inm_scrv = igi->igi_rv; 2483 } 2484 inm->inm_sctimer = 1; 2485 V_state_change_timers_running = 1; 2486 2487 error = 0; 2488 break; 2489 } 2490 } 2491 2492 /* 2493 * Only update the T0 state if state change is atomic, 2494 * i.e. we don't need to wait for a timer to fire before we 2495 * can consider the state change to have been communicated. 2496 */ 2497 if (syncstates) { 2498 inm_commit(inm); 2499 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2500 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2501 } 2502 2503 return (error); 2504 } 2505 2506 /* 2507 * Issue an intermediate state change during the IGMP life-cycle. 2508 */ 2509 static int 2510 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2511 { 2512 struct ifnet *ifp; 2513 int retval; 2514 2515 CTR4(KTR_IGMPV3, "%s: state change for 0x%08x on ifp %p(%s)", __func__, 2516 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2517 2518 ifp = inm->inm_ifp; 2519 2520 IN_MULTI_LIST_LOCK_ASSERT(); 2521 IGMP_LOCK_ASSERT(); 2522 2523 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2524 2525 if ((ifp->if_flags & IFF_LOOPBACK) || 2526 (igi->igi_flags & IGIF_SILENT) || 2527 !igmp_isgroupreported(inm->inm_addr) || 2528 (igi->igi_version != IGMP_VERSION_3)) { 2529 if (!igmp_isgroupreported(inm->inm_addr)) { 2530 CTR1(KTR_IGMPV3, 2531 "%s: not kicking state machine for silent group", __func__); 2532 } 2533 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2534 inm_commit(inm); 2535 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2536 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2537 return (0); 2538 } 2539 2540 mbufq_drain(&inm->inm_scq); 2541 2542 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2543 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2544 if (retval <= 0) 2545 return (-retval); 2546 2547 /* 2548 * If record(s) were enqueued, start the state-change 2549 * report timer for this group. 2550 */ 2551 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2552 inm->inm_sctimer = 1; 2553 V_state_change_timers_running = 1; 2554 2555 return (0); 2556 } 2557 2558 /* 2559 * Perform the final leave for an IGMP group. 2560 * 2561 * When leaving a group: 2562 * IGMPv1 does nothing. 2563 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2564 * IGMPv3 enqueues a state-change report containing a transition 2565 * to INCLUDE {} for immediate transmission. 2566 */ 2567 static void 2568 igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2569 { 2570 int syncstates; 2571 2572 syncstates = 1; 2573 2574 CTR4(KTR_IGMPV3, "%s: final leave 0x%08x on ifp %p(%s)", 2575 __func__, ntohl(inm->inm_addr.s_addr), inm->inm_ifp, 2576 inm->inm_ifp->if_xname); 2577 2578 IN_MULTI_LIST_LOCK_ASSERT(); 2579 IGMP_LOCK_ASSERT(); 2580 2581 switch (inm->inm_state) { 2582 case IGMP_NOT_MEMBER: 2583 case IGMP_SILENT_MEMBER: 2584 case IGMP_LEAVING_MEMBER: 2585 /* Already leaving or left; do nothing. */ 2586 CTR1(KTR_IGMPV3, 2587 "%s: not kicking state machine for silent group", __func__); 2588 break; 2589 case IGMP_REPORTING_MEMBER: 2590 case IGMP_IDLE_MEMBER: 2591 case IGMP_G_QUERY_PENDING_MEMBER: 2592 case IGMP_SG_QUERY_PENDING_MEMBER: 2593 if (igi->igi_version == IGMP_VERSION_2) { 2594 #ifdef INVARIANTS 2595 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2596 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2597 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2598 __func__); 2599 #endif 2600 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2601 inm->inm_state = IGMP_NOT_MEMBER; 2602 } else if (igi->igi_version == IGMP_VERSION_3) { 2603 /* 2604 * Stop group timer and all pending reports. 2605 * Immediately enqueue a state-change report 2606 * TO_IN {} to be sent on the next fast timeout, 2607 * giving us an opportunity to merge reports. 2608 */ 2609 mbufq_drain(&inm->inm_scq); 2610 inm->inm_timer = 0; 2611 if (igi->igi_flags & IGIF_LOOPBACK) { 2612 inm->inm_scrv = 1; 2613 } else { 2614 inm->inm_scrv = igi->igi_rv; 2615 } 2616 CTR4(KTR_IGMPV3, "%s: Leaving 0x%08x/%s with %d " 2617 "pending retransmissions.", __func__, 2618 ntohl(inm->inm_addr.s_addr), 2619 inm->inm_ifp->if_xname, inm->inm_scrv); 2620 if (inm->inm_scrv == 0) { 2621 inm->inm_state = IGMP_NOT_MEMBER; 2622 inm->inm_sctimer = 0; 2623 } else { 2624 int retval __unused; 2625 2626 inm_acquire_locked(inm); 2627 2628 retval = igmp_v3_enqueue_group_record( 2629 &inm->inm_scq, inm, 1, 0, 0); 2630 KASSERT(retval != 0, 2631 ("%s: enqueue record = %d", __func__, 2632 retval)); 2633 2634 inm->inm_state = IGMP_LEAVING_MEMBER; 2635 inm->inm_sctimer = 1; 2636 V_state_change_timers_running = 1; 2637 syncstates = 0; 2638 } 2639 break; 2640 } 2641 break; 2642 case IGMP_LAZY_MEMBER: 2643 case IGMP_SLEEPING_MEMBER: 2644 case IGMP_AWAKENING_MEMBER: 2645 /* Our reports are suppressed; do nothing. */ 2646 break; 2647 } 2648 2649 if (syncstates) { 2650 inm_commit(inm); 2651 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2652 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2653 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2654 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for 0x%08x/%s", 2655 __func__, ntohl(inm->inm_addr.s_addr), 2656 inm->inm_ifp->if_xname); 2657 } 2658 } 2659 2660 /* 2661 * Enqueue an IGMPv3 group record to the given output queue. 2662 * 2663 * XXX This function could do with having the allocation code 2664 * split out, and the multiple-tree-walks coalesced into a single 2665 * routine as has been done in igmp_v3_enqueue_filter_change(). 2666 * 2667 * If is_state_change is zero, a current-state record is appended. 2668 * If is_state_change is non-zero, a state-change report is appended. 2669 * 2670 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2671 * If is_group_query is zero, and if there is a packet with free space 2672 * at the tail of the queue, it will be appended to providing there 2673 * is enough free space. 2674 * Otherwise a new mbuf packet chain is allocated. 2675 * 2676 * If is_source_query is non-zero, each source is checked to see if 2677 * it was recorded for a Group-Source query, and will be omitted if 2678 * it is not both in-mode and recorded. 2679 * 2680 * The function will attempt to allocate leading space in the packet 2681 * for the IP/IGMP header to be prepended without fragmenting the chain. 2682 * 2683 * If successful the size of all data appended to the queue is returned, 2684 * otherwise an error code less than zero is returned, or zero if 2685 * no record(s) were appended. 2686 */ 2687 static int 2688 igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2689 const int is_state_change, const int is_group_query, 2690 const int is_source_query) 2691 { 2692 struct igmp_grouprec ig; 2693 struct igmp_grouprec *pig; 2694 struct ifnet *ifp; 2695 struct ip_msource *ims, *nims; 2696 struct mbuf *m0, *m, *md; 2697 int is_filter_list_change; 2698 int minrec0len, m0srcs, msrcs, nbytes, off; 2699 int record_has_sources; 2700 int now; 2701 int type; 2702 in_addr_t naddr; 2703 uint8_t mode; 2704 2705 IN_MULTI_LIST_LOCK_ASSERT(); 2706 2707 ifp = inm->inm_ifp; 2708 is_filter_list_change = 0; 2709 m = NULL; 2710 m0 = NULL; 2711 m0srcs = 0; 2712 msrcs = 0; 2713 nbytes = 0; 2714 nims = NULL; 2715 record_has_sources = 1; 2716 pig = NULL; 2717 type = IGMP_DO_NOTHING; 2718 mode = inm->inm_st[1].iss_fmode; 2719 2720 /* 2721 * If we did not transition out of ASM mode during t0->t1, 2722 * and there are no source nodes to process, we can skip 2723 * the generation of source records. 2724 */ 2725 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2726 inm->inm_nsrc == 0) 2727 record_has_sources = 0; 2728 2729 if (is_state_change) { 2730 /* 2731 * Queue a state change record. 2732 * If the mode did not change, and there are non-ASM 2733 * listeners or source filters present, 2734 * we potentially need to issue two records for the group. 2735 * If we are transitioning to MCAST_UNDEFINED, we need 2736 * not send any sources. 2737 * If there are ASM listeners, and there was no filter 2738 * mode transition of any kind, do nothing. 2739 */ 2740 if (mode != inm->inm_st[0].iss_fmode) { 2741 if (mode == MCAST_EXCLUDE) { 2742 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2743 __func__); 2744 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2745 } else { 2746 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2747 __func__); 2748 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2749 if (mode == MCAST_UNDEFINED) 2750 record_has_sources = 0; 2751 } 2752 } else { 2753 if (record_has_sources) { 2754 is_filter_list_change = 1; 2755 } else { 2756 type = IGMP_DO_NOTHING; 2757 } 2758 } 2759 } else { 2760 /* 2761 * Queue a current state record. 2762 */ 2763 if (mode == MCAST_EXCLUDE) { 2764 type = IGMP_MODE_IS_EXCLUDE; 2765 } else if (mode == MCAST_INCLUDE) { 2766 type = IGMP_MODE_IS_INCLUDE; 2767 KASSERT(inm->inm_st[1].iss_asm == 0, 2768 ("%s: inm %p is INCLUDE but ASM count is %d", 2769 __func__, inm, inm->inm_st[1].iss_asm)); 2770 } 2771 } 2772 2773 /* 2774 * Generate the filter list changes using a separate function. 2775 */ 2776 if (is_filter_list_change) 2777 return (igmp_v3_enqueue_filter_change(mq, inm)); 2778 2779 if (type == IGMP_DO_NOTHING) { 2780 CTR3(KTR_IGMPV3, "%s: nothing to do for 0x%08x/%s", __func__, 2781 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2782 return (0); 2783 } 2784 2785 /* 2786 * If any sources are present, we must be able to fit at least 2787 * one in the trailing space of the tail packet's mbuf, 2788 * ideally more. 2789 */ 2790 minrec0len = sizeof(struct igmp_grouprec); 2791 if (record_has_sources) 2792 minrec0len += sizeof(in_addr_t); 2793 2794 CTR4(KTR_IGMPV3, "%s: queueing %s for 0x%08x/%s", __func__, 2795 igmp_rec_type_to_str(type), ntohl(inm->inm_addr.s_addr), 2796 inm->inm_ifp->if_xname); 2797 2798 /* 2799 * Check if we have a packet in the tail of the queue for this 2800 * group into which the first group record for this group will fit. 2801 * Otherwise allocate a new packet. 2802 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2803 * Note: Group records for G/GSR query responses MUST be sent 2804 * in their own packet. 2805 */ 2806 m0 = mbufq_last(mq); 2807 if (!is_group_query && 2808 m0 != NULL && 2809 (m0->m_pkthdr.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2810 (m0->m_pkthdr.len + minrec0len) < 2811 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2812 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2813 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2814 m = m0; 2815 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2816 } else { 2817 if (mbufq_full(mq)) { 2818 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2819 return (-ENOMEM); 2820 } 2821 m = NULL; 2822 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2823 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2824 if (!is_state_change && !is_group_query) { 2825 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2826 if (m) 2827 m->m_data += IGMP_LEADINGSPACE; 2828 } 2829 if (m == NULL) { 2830 m = m_gethdr(M_NOWAIT, MT_DATA); 2831 if (m) 2832 M_ALIGN(m, IGMP_LEADINGSPACE); 2833 } 2834 if (m == NULL) 2835 return (-ENOMEM); 2836 2837 igmp_save_context(m, ifp); 2838 2839 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2840 } 2841 2842 /* 2843 * Append group record. 2844 * If we have sources, we don't know how many yet. 2845 */ 2846 ig.ig_type = type; 2847 ig.ig_datalen = 0; 2848 ig.ig_numsrc = 0; 2849 ig.ig_group = inm->inm_addr; 2850 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2851 if (m != m0) 2852 m_freem(m); 2853 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2854 return (-ENOMEM); 2855 } 2856 nbytes += sizeof(struct igmp_grouprec); 2857 2858 /* 2859 * Append as many sources as will fit in the first packet. 2860 * If we are appending to a new packet, the chain allocation 2861 * may potentially use clusters; use m_getptr() in this case. 2862 * If we are appending to an existing packet, we need to obtain 2863 * a pointer to the group record after m_append(), in case a new 2864 * mbuf was allocated. 2865 * Only append sources which are in-mode at t1. If we are 2866 * transitioning to MCAST_UNDEFINED state on the group, do not 2867 * include source entries. 2868 * Only report recorded sources in our filter set when responding 2869 * to a group-source query. 2870 */ 2871 if (record_has_sources) { 2872 if (m == m0) { 2873 md = m_last(m); 2874 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2875 md->m_len - nbytes); 2876 } else { 2877 md = m_getptr(m, 0, &off); 2878 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2879 off); 2880 } 2881 msrcs = 0; 2882 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2883 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2884 ims->ims_haddr); 2885 now = ims_get_mode(inm, ims, 1); 2886 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2887 if ((now != mode) || 2888 (now == mode && mode == MCAST_UNDEFINED)) { 2889 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2890 continue; 2891 } 2892 if (is_source_query && ims->ims_stp == 0) { 2893 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2894 __func__); 2895 continue; 2896 } 2897 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2898 naddr = htonl(ims->ims_haddr); 2899 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2900 if (m != m0) 2901 m_freem(m); 2902 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2903 __func__); 2904 return (-ENOMEM); 2905 } 2906 nbytes += sizeof(in_addr_t); 2907 ++msrcs; 2908 if (msrcs == m0srcs) 2909 break; 2910 } 2911 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2912 msrcs); 2913 pig->ig_numsrc = htons(msrcs); 2914 nbytes += (msrcs * sizeof(in_addr_t)); 2915 } 2916 2917 if (is_source_query && msrcs == 0) { 2918 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2919 if (m != m0) 2920 m_freem(m); 2921 return (0); 2922 } 2923 2924 /* 2925 * We are good to go with first packet. 2926 */ 2927 if (m != m0) { 2928 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2929 m->m_pkthdr.vt_nrecs = 1; 2930 mbufq_enqueue(mq, m); 2931 } else 2932 m->m_pkthdr.vt_nrecs++; 2933 2934 /* 2935 * No further work needed if no source list in packet(s). 2936 */ 2937 if (!record_has_sources) 2938 return (nbytes); 2939 2940 /* 2941 * Whilst sources remain to be announced, we need to allocate 2942 * a new packet and fill out as many sources as will fit. 2943 * Always try for a cluster first. 2944 */ 2945 while (nims != NULL) { 2946 if (mbufq_full(mq)) { 2947 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2948 return (-ENOMEM); 2949 } 2950 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2951 if (m) 2952 m->m_data += IGMP_LEADINGSPACE; 2953 if (m == NULL) { 2954 m = m_gethdr(M_NOWAIT, MT_DATA); 2955 if (m) 2956 M_ALIGN(m, IGMP_LEADINGSPACE); 2957 } 2958 if (m == NULL) 2959 return (-ENOMEM); 2960 igmp_save_context(m, ifp); 2961 md = m_getptr(m, 0, &off); 2962 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2963 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2964 2965 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2966 if (m != m0) 2967 m_freem(m); 2968 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2969 return (-ENOMEM); 2970 } 2971 m->m_pkthdr.vt_nrecs = 1; 2972 nbytes += sizeof(struct igmp_grouprec); 2973 2974 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2975 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2976 2977 msrcs = 0; 2978 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2979 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2980 ims->ims_haddr); 2981 now = ims_get_mode(inm, ims, 1); 2982 if ((now != mode) || 2983 (now == mode && mode == MCAST_UNDEFINED)) { 2984 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2985 continue; 2986 } 2987 if (is_source_query && ims->ims_stp == 0) { 2988 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2989 __func__); 2990 continue; 2991 } 2992 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2993 naddr = htonl(ims->ims_haddr); 2994 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2995 if (m != m0) 2996 m_freem(m); 2997 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2998 __func__); 2999 return (-ENOMEM); 3000 } 3001 ++msrcs; 3002 if (msrcs == m0srcs) 3003 break; 3004 } 3005 pig->ig_numsrc = htons(msrcs); 3006 nbytes += (msrcs * sizeof(in_addr_t)); 3007 3008 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 3009 mbufq_enqueue(mq, m); 3010 } 3011 3012 return (nbytes); 3013 } 3014 3015 /* 3016 * Type used to mark record pass completion. 3017 * We exploit the fact we can cast to this easily from the 3018 * current filter modes on each ip_msource node. 3019 */ 3020 typedef enum { 3021 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 3022 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 3023 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 3024 REC_FULL = REC_ALLOW | REC_BLOCK 3025 } rectype_t; 3026 3027 /* 3028 * Enqueue an IGMPv3 filter list change to the given output queue. 3029 * 3030 * Source list filter state is held in an RB-tree. When the filter list 3031 * for a group is changed without changing its mode, we need to compute 3032 * the deltas between T0 and T1 for each source in the filter set, 3033 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 3034 * 3035 * As we may potentially queue two record types, and the entire R-B tree 3036 * needs to be walked at once, we break this out into its own function 3037 * so we can generate a tightly packed queue of packets. 3038 * 3039 * XXX This could be written to only use one tree walk, although that makes 3040 * serializing into the mbuf chains a bit harder. For now we do two walks 3041 * which makes things easier on us, and it may or may not be harder on 3042 * the L2 cache. 3043 * 3044 * If successful the size of all data appended to the queue is returned, 3045 * otherwise an error code less than zero is returned, or zero if 3046 * no record(s) were appended. 3047 */ 3048 static int 3049 igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3050 { 3051 static const int MINRECLEN = 3052 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3053 struct ifnet *ifp; 3054 struct igmp_grouprec ig; 3055 struct igmp_grouprec *pig; 3056 struct ip_msource *ims, *nims; 3057 struct mbuf *m, *m0, *md; 3058 in_addr_t naddr; 3059 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3060 #ifdef KTR 3061 int nallow, nblock; 3062 #endif 3063 uint8_t mode, now, then; 3064 rectype_t crt, drt, nrt; 3065 3066 IN_MULTI_LIST_LOCK_ASSERT(); 3067 3068 if (inm->inm_nsrc == 0 || 3069 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3070 return (0); 3071 3072 ifp = inm->inm_ifp; /* interface */ 3073 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3074 crt = REC_NONE; /* current group record type */ 3075 drt = REC_NONE; /* mask of completed group record types */ 3076 nrt = REC_NONE; /* record type for current node */ 3077 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3078 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3079 npbytes = 0; /* # of bytes appended this packet */ 3080 rsrcs = 0; /* # sources encoded in current record */ 3081 schanged = 0; /* # nodes encoded in overall filter change */ 3082 #ifdef KTR 3083 nallow = 0; /* # of source entries in ALLOW_NEW */ 3084 nblock = 0; /* # of source entries in BLOCK_OLD */ 3085 #endif 3086 nims = NULL; /* next tree node pointer */ 3087 3088 /* 3089 * For each possible filter record mode. 3090 * The first kind of source we encounter tells us which 3091 * is the first kind of record we start appending. 3092 * If a node transitioned to UNDEFINED at t1, its mode is treated 3093 * as the inverse of the group's filter mode. 3094 */ 3095 while (drt != REC_FULL) { 3096 do { 3097 m0 = mbufq_last(mq); 3098 if (m0 != NULL && 3099 (m0->m_pkthdr.vt_nrecs + 1 <= 3100 IGMP_V3_REPORT_MAXRECS) && 3101 (m0->m_pkthdr.len + MINRECLEN) < 3102 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3103 m = m0; 3104 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3105 sizeof(struct igmp_grouprec)) / 3106 sizeof(in_addr_t); 3107 CTR1(KTR_IGMPV3, 3108 "%s: use previous packet", __func__); 3109 } else { 3110 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3111 if (m) 3112 m->m_data += IGMP_LEADINGSPACE; 3113 if (m == NULL) { 3114 m = m_gethdr(M_NOWAIT, MT_DATA); 3115 if (m) 3116 M_ALIGN(m, IGMP_LEADINGSPACE); 3117 } 3118 if (m == NULL) { 3119 CTR1(KTR_IGMPV3, 3120 "%s: m_get*() failed", __func__); 3121 return (-ENOMEM); 3122 } 3123 m->m_pkthdr.vt_nrecs = 0; 3124 igmp_save_context(m, ifp); 3125 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3126 sizeof(struct igmp_grouprec)) / 3127 sizeof(in_addr_t); 3128 npbytes = 0; 3129 CTR1(KTR_IGMPV3, 3130 "%s: allocated new packet", __func__); 3131 } 3132 /* 3133 * Append the IGMP group record header to the 3134 * current packet's data area. 3135 * Recalculate pointer to free space for next 3136 * group record, in case m_append() allocated 3137 * a new mbuf or cluster. 3138 */ 3139 memset(&ig, 0, sizeof(ig)); 3140 ig.ig_group = inm->inm_addr; 3141 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3142 if (m != m0) 3143 m_freem(m); 3144 CTR1(KTR_IGMPV3, 3145 "%s: m_append() failed", __func__); 3146 return (-ENOMEM); 3147 } 3148 npbytes += sizeof(struct igmp_grouprec); 3149 if (m != m0) { 3150 /* new packet; offset in c hain */ 3151 md = m_getptr(m, npbytes - 3152 sizeof(struct igmp_grouprec), &off); 3153 pig = (struct igmp_grouprec *)(mtod(md, 3154 uint8_t *) + off); 3155 } else { 3156 /* current packet; offset from last append */ 3157 md = m_last(m); 3158 pig = (struct igmp_grouprec *)(mtod(md, 3159 uint8_t *) + md->m_len - 3160 sizeof(struct igmp_grouprec)); 3161 } 3162 /* 3163 * Begin walking the tree for this record type 3164 * pass, or continue from where we left off 3165 * previously if we had to allocate a new packet. 3166 * Only report deltas in-mode at t1. 3167 * We need not report included sources as allowed 3168 * if we are in inclusive mode on the group, 3169 * however the converse is not true. 3170 */ 3171 rsrcs = 0; 3172 if (nims == NULL) 3173 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3174 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3175 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", 3176 __func__, ims->ims_haddr); 3177 now = ims_get_mode(inm, ims, 1); 3178 then = ims_get_mode(inm, ims, 0); 3179 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3180 __func__, then, now); 3181 if (now == then) { 3182 CTR1(KTR_IGMPV3, 3183 "%s: skip unchanged", __func__); 3184 continue; 3185 } 3186 if (mode == MCAST_EXCLUDE && 3187 now == MCAST_INCLUDE) { 3188 CTR1(KTR_IGMPV3, 3189 "%s: skip IN src on EX group", 3190 __func__); 3191 continue; 3192 } 3193 nrt = (rectype_t)now; 3194 if (nrt == REC_NONE) 3195 nrt = (rectype_t)(~mode & REC_FULL); 3196 if (schanged++ == 0) { 3197 crt = nrt; 3198 } else if (crt != nrt) 3199 continue; 3200 naddr = htonl(ims->ims_haddr); 3201 if (!m_append(m, sizeof(in_addr_t), 3202 (void *)&naddr)) { 3203 if (m != m0) 3204 m_freem(m); 3205 CTR1(KTR_IGMPV3, 3206 "%s: m_append() failed", __func__); 3207 return (-ENOMEM); 3208 } 3209 #ifdef KTR 3210 nallow += !!(crt == REC_ALLOW); 3211 nblock += !!(crt == REC_BLOCK); 3212 #endif 3213 if (++rsrcs == m0srcs) 3214 break; 3215 } 3216 /* 3217 * If we did not append any tree nodes on this 3218 * pass, back out of allocations. 3219 */ 3220 if (rsrcs == 0) { 3221 npbytes -= sizeof(struct igmp_grouprec); 3222 if (m != m0) { 3223 CTR1(KTR_IGMPV3, 3224 "%s: m_free(m)", __func__); 3225 m_freem(m); 3226 } else { 3227 CTR1(KTR_IGMPV3, 3228 "%s: m_adj(m, -ig)", __func__); 3229 m_adj(m, -((int)sizeof( 3230 struct igmp_grouprec))); 3231 } 3232 continue; 3233 } 3234 npbytes += (rsrcs * sizeof(in_addr_t)); 3235 if (crt == REC_ALLOW) 3236 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3237 else if (crt == REC_BLOCK) 3238 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3239 pig->ig_numsrc = htons(rsrcs); 3240 /* 3241 * Count the new group record, and enqueue this 3242 * packet if it wasn't already queued. 3243 */ 3244 m->m_pkthdr.vt_nrecs++; 3245 if (m != m0) 3246 mbufq_enqueue(mq, m); 3247 nbytes += npbytes; 3248 } while (nims != NULL); 3249 drt |= crt; 3250 crt = (~crt & REC_FULL); 3251 } 3252 3253 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3254 nallow, nblock); 3255 3256 return (nbytes); 3257 } 3258 3259 static int 3260 igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3261 { 3262 struct mbufq *gq; 3263 struct mbuf *m; /* pending state-change */ 3264 struct mbuf *m0; /* copy of pending state-change */ 3265 struct mbuf *mt; /* last state-change in packet */ 3266 int docopy, domerge; 3267 u_int recslen; 3268 3269 docopy = 0; 3270 domerge = 0; 3271 recslen = 0; 3272 3273 IN_MULTI_LIST_LOCK_ASSERT(); 3274 IGMP_LOCK_ASSERT(); 3275 3276 /* 3277 * If there are further pending retransmissions, make a writable 3278 * copy of each queued state-change message before merging. 3279 */ 3280 if (inm->inm_scrv > 0) 3281 docopy = 1; 3282 3283 gq = &inm->inm_scq; 3284 #ifdef KTR 3285 if (mbufq_first(gq) == NULL) { 3286 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3287 __func__, inm); 3288 } 3289 #endif 3290 3291 m = mbufq_first(gq); 3292 while (m != NULL) { 3293 /* 3294 * Only merge the report into the current packet if 3295 * there is sufficient space to do so; an IGMPv3 report 3296 * packet may only contain 65,535 group records. 3297 * Always use a simple mbuf chain concatentation to do this, 3298 * as large state changes for single groups may have 3299 * allocated clusters. 3300 */ 3301 domerge = 0; 3302 mt = mbufq_last(scq); 3303 if (mt != NULL) { 3304 recslen = m_length(m, NULL); 3305 3306 if ((mt->m_pkthdr.vt_nrecs + 3307 m->m_pkthdr.vt_nrecs <= 3308 IGMP_V3_REPORT_MAXRECS) && 3309 (mt->m_pkthdr.len + recslen <= 3310 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3311 domerge = 1; 3312 } 3313 3314 if (!domerge && mbufq_full(gq)) { 3315 CTR2(KTR_IGMPV3, 3316 "%s: outbound queue full, skipping whole packet %p", 3317 __func__, m); 3318 mt = m->m_nextpkt; 3319 if (!docopy) 3320 m_freem(m); 3321 m = mt; 3322 continue; 3323 } 3324 3325 if (!docopy) { 3326 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3327 m0 = mbufq_dequeue(gq); 3328 m = m0->m_nextpkt; 3329 } else { 3330 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3331 m0 = m_dup(m, M_NOWAIT); 3332 if (m0 == NULL) 3333 return (ENOMEM); 3334 m0->m_nextpkt = NULL; 3335 m = m->m_nextpkt; 3336 } 3337 3338 if (!domerge) { 3339 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3340 __func__, m0, scq); 3341 mbufq_enqueue(scq, m0); 3342 } else { 3343 struct mbuf *mtl; /* last mbuf of packet mt */ 3344 3345 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3346 __func__, m0, mt); 3347 3348 mtl = m_last(mt); 3349 m0->m_flags &= ~M_PKTHDR; 3350 mt->m_pkthdr.len += recslen; 3351 mt->m_pkthdr.vt_nrecs += 3352 m0->m_pkthdr.vt_nrecs; 3353 3354 mtl->m_next = m0; 3355 } 3356 } 3357 3358 return (0); 3359 } 3360 3361 /* 3362 * Respond to a pending IGMPv3 General Query. 3363 */ 3364 static void 3365 igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3366 { 3367 struct ifmultiaddr *ifma; 3368 struct ifnet *ifp; 3369 struct in_multi *inm; 3370 int retval __unused, loop; 3371 3372 IN_MULTI_LIST_LOCK_ASSERT(); 3373 IGMP_LOCK_ASSERT(); 3374 NET_EPOCH_ASSERT(); 3375 3376 KASSERT(igi->igi_version == IGMP_VERSION_3, 3377 ("%s: called when version %d", __func__, igi->igi_version)); 3378 3379 /* 3380 * Check that there are some packets queued. If so, send them first. 3381 * For large number of groups the reply to general query can take 3382 * many packets, we should finish sending them before starting of 3383 * queuing the new reply. 3384 */ 3385 if (mbufq_len(&igi->igi_gq) != 0) 3386 goto send; 3387 3388 ifp = igi->igi_ifp; 3389 3390 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3391 inm = inm_ifmultiaddr_get_inm(ifma); 3392 if (inm == NULL) 3393 continue; 3394 KASSERT(ifp == inm->inm_ifp, 3395 ("%s: inconsistent ifp", __func__)); 3396 3397 switch (inm->inm_state) { 3398 case IGMP_NOT_MEMBER: 3399 case IGMP_SILENT_MEMBER: 3400 break; 3401 case IGMP_REPORTING_MEMBER: 3402 case IGMP_IDLE_MEMBER: 3403 case IGMP_LAZY_MEMBER: 3404 case IGMP_SLEEPING_MEMBER: 3405 case IGMP_AWAKENING_MEMBER: 3406 inm->inm_state = IGMP_REPORTING_MEMBER; 3407 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3408 inm, 0, 0, 0); 3409 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3410 __func__, retval); 3411 break; 3412 case IGMP_G_QUERY_PENDING_MEMBER: 3413 case IGMP_SG_QUERY_PENDING_MEMBER: 3414 case IGMP_LEAVING_MEMBER: 3415 break; 3416 } 3417 } 3418 3419 send: 3420 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3421 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3422 3423 /* 3424 * Slew transmission of bursts over 500ms intervals. 3425 */ 3426 if (mbufq_first(&igi->igi_gq) != NULL) { 3427 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3428 IGMP_RESPONSE_BURST_INTERVAL); 3429 V_interface_timers_running = 1; 3430 } 3431 } 3432 3433 /* 3434 * Transmit the next pending IGMP message in the output queue. 3435 * 3436 * We get called from netisr_processqueue(). A mutex private to igmpoq 3437 * will be acquired and released around this routine. 3438 * 3439 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3440 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3441 * a link and uses a link-scope multicast address. 3442 */ 3443 static void 3444 igmp_intr(struct mbuf *m) 3445 { 3446 struct ip_moptions imo; 3447 struct ifnet *ifp; 3448 struct mbuf *ipopts, *m0; 3449 int error; 3450 uint32_t ifindex; 3451 3452 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3453 3454 /* 3455 * Set VNET image pointer from enqueued mbuf chain 3456 * before doing anything else. Whilst we use interface 3457 * indexes to guard against interface detach, they are 3458 * unique to each VIMAGE and must be retrieved. 3459 */ 3460 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3461 ifindex = igmp_restore_context(m); 3462 3463 /* 3464 * Check if the ifnet still exists. This limits the scope of 3465 * any race in the absence of a global ifp lock for low cost 3466 * (an array lookup). 3467 */ 3468 ifp = ifnet_byindex(ifindex); 3469 if (ifp == NULL) { 3470 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3471 __func__, m, ifindex); 3472 m_freem(m); 3473 IPSTAT_INC(ips_noroute); 3474 goto out; 3475 } 3476 3477 ipopts = V_igmp_sendra ? m_raopt : NULL; 3478 3479 imo.imo_multicast_ttl = 1; 3480 imo.imo_multicast_vif = -1; 3481 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3482 3483 /* 3484 * If the user requested that IGMP traffic be explicitly 3485 * redirected to the loopback interface (e.g. they are running a 3486 * MANET interface and the routing protocol needs to see the 3487 * updates), handle this now. 3488 */ 3489 if (m->m_flags & M_IGMP_LOOP) 3490 imo.imo_multicast_ifp = V_loif; 3491 else 3492 imo.imo_multicast_ifp = ifp; 3493 3494 if (m->m_flags & M_IGMPV2) { 3495 m0 = m; 3496 } else { 3497 m0 = igmp_v3_encap_report(ifp, m); 3498 if (m0 == NULL) { 3499 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3500 m_freem(m); 3501 IPSTAT_INC(ips_odropped); 3502 goto out; 3503 } 3504 } 3505 3506 igmp_scrub_context(m0); 3507 m_clrprotoflags(m); 3508 m0->m_pkthdr.rcvif = V_loif; 3509 #ifdef MAC 3510 mac_netinet_igmp_send(ifp, m0); 3511 #endif 3512 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3513 if (error) { 3514 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3515 goto out; 3516 } 3517 3518 IGMPSTAT_INC(igps_snd_reports); 3519 3520 out: 3521 /* 3522 * We must restore the existing vnet pointer before 3523 * continuing as we are run from netisr context. 3524 */ 3525 CURVNET_RESTORE(); 3526 } 3527 3528 /* 3529 * Encapsulate an IGMPv3 report. 3530 * 3531 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3532 * chain has already had its IP/IGMPv3 header prepended. In this case 3533 * the function will not attempt to prepend; the lengths and checksums 3534 * will however be re-computed. 3535 * 3536 * Returns a pointer to the new mbuf chain head, or NULL if the 3537 * allocation failed. 3538 */ 3539 static struct mbuf * 3540 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3541 { 3542 struct igmp_report *igmp; 3543 struct ip *ip; 3544 int hdrlen, igmpreclen; 3545 3546 KASSERT((m->m_flags & M_PKTHDR), 3547 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3548 3549 igmpreclen = m_length(m, NULL); 3550 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); 3551 3552 if (m->m_flags & M_IGMPV3_HDR) { 3553 igmpreclen -= hdrlen; 3554 } else { 3555 M_PREPEND(m, hdrlen, M_NOWAIT); 3556 if (m == NULL) 3557 return (NULL); 3558 m->m_flags |= M_IGMPV3_HDR; 3559 } 3560 3561 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen); 3562 3563 m->m_data += sizeof(struct ip); 3564 m->m_len -= sizeof(struct ip); 3565 3566 igmp = mtod(m, struct igmp_report *); 3567 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; 3568 igmp->ir_rsv1 = 0; 3569 igmp->ir_rsv2 = 0; 3570 igmp->ir_numgrps = htons(m->m_pkthdr.vt_nrecs); 3571 igmp->ir_cksum = 0; 3572 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3573 m->m_pkthdr.vt_nrecs = 0; 3574 3575 m->m_data -= sizeof(struct ip); 3576 m->m_len += sizeof(struct ip); 3577 3578 ip = mtod(m, struct ip *); 3579 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; 3580 ip->ip_len = htons(hdrlen + igmpreclen); 3581 ip->ip_off = htons(IP_DF); 3582 ip->ip_p = IPPROTO_IGMP; 3583 ip->ip_sum = 0; 3584 3585 ip->ip_src.s_addr = INADDR_ANY; 3586 3587 if (m->m_flags & M_IGMP_LOOP) { 3588 struct in_ifaddr *ia; 3589 3590 IFP_TO_IA(ifp, ia); 3591 if (ia != NULL) 3592 ip->ip_src = ia->ia_addr.sin_addr; 3593 } 3594 3595 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); 3596 3597 return (m); 3598 } 3599 3600 #ifdef KTR 3601 static char * 3602 igmp_rec_type_to_str(const int type) 3603 { 3604 3605 switch (type) { 3606 case IGMP_CHANGE_TO_EXCLUDE_MODE: 3607 return "TO_EX"; 3608 break; 3609 case IGMP_CHANGE_TO_INCLUDE_MODE: 3610 return "TO_IN"; 3611 break; 3612 case IGMP_MODE_IS_EXCLUDE: 3613 return "MODE_EX"; 3614 break; 3615 case IGMP_MODE_IS_INCLUDE: 3616 return "MODE_IN"; 3617 break; 3618 case IGMP_ALLOW_NEW_SOURCES: 3619 return "ALLOW_NEW"; 3620 break; 3621 case IGMP_BLOCK_OLD_SOURCES: 3622 return "BLOCK_OLD"; 3623 break; 3624 default: 3625 break; 3626 } 3627 return "unknown"; 3628 } 3629 #endif 3630 3631 #ifdef VIMAGE 3632 static void 3633 vnet_igmp_init(const void *unused __unused) 3634 { 3635 3636 netisr_register_vnet(&igmp_nh); 3637 } 3638 VNET_SYSINIT(vnet_igmp_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3639 vnet_igmp_init, NULL); 3640 3641 static void 3642 vnet_igmp_uninit(const void *unused __unused) 3643 { 3644 3645 /* This can happen when we shutdown the entire network stack. */ 3646 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3647 3648 netisr_unregister_vnet(&igmp_nh); 3649 } 3650 VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3651 vnet_igmp_uninit, NULL); 3652 #endif 3653 3654 #ifdef DDB 3655 DB_SHOW_COMMAND(igi_list, db_show_igi_list) 3656 { 3657 struct igmp_ifsoftc *igi, *tigi; 3658 LIST_HEAD(_igi_list, igmp_ifsoftc) *igi_head; 3659 3660 if (!have_addr) { 3661 db_printf("usage: show igi_list <addr>\n"); 3662 return; 3663 } 3664 igi_head = (struct _igi_list *)addr; 3665 3666 LIST_FOREACH_SAFE(igi, igi_head, igi_link, tigi) { 3667 db_printf("igmp_ifsoftc %p:\n", igi); 3668 db_printf(" ifp %p\n", igi->igi_ifp); 3669 db_printf(" version %u\n", igi->igi_version); 3670 db_printf(" v1_timer %u\n", igi->igi_v1_timer); 3671 db_printf(" v2_timer %u\n", igi->igi_v2_timer); 3672 db_printf(" v3_timer %u\n", igi->igi_v3_timer); 3673 db_printf(" flags %#x\n", igi->igi_flags); 3674 db_printf(" rv %u\n", igi->igi_rv); 3675 db_printf(" qi %u\n", igi->igi_qi); 3676 db_printf(" qri %u\n", igi->igi_qri); 3677 db_printf(" uri %u\n", igi->igi_uri); 3678 /* struct mbufq igi_gq; */ 3679 db_printf("\n"); 3680 } 3681 } 3682 #endif 3683 3684 static int 3685 igmp_modevent(module_t mod, int type, void *unused __unused) 3686 { 3687 3688 switch (type) { 3689 case MOD_LOAD: 3690 CTR1(KTR_IGMPV3, "%s: initializing", __func__); 3691 IGMP_LOCK_INIT(); 3692 m_raopt = igmp_ra_alloc(); 3693 netisr_register(&igmp_nh); 3694 callout_init(&igmpslow_callout, 1); 3695 callout_reset(&igmpslow_callout, hz / IGMP_SLOWHZ, 3696 igmp_slowtimo, NULL); 3697 callout_init(&igmpfast_callout, 1); 3698 callout_reset(&igmpfast_callout, hz / IGMP_FASTHZ, 3699 igmp_fasttimo, NULL); 3700 break; 3701 case MOD_UNLOAD: 3702 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3703 netisr_unregister(&igmp_nh); 3704 m_free(m_raopt); 3705 m_raopt = NULL; 3706 IGMP_LOCK_DESTROY(); 3707 break; 3708 default: 3709 return (EOPNOTSUPP); 3710 } 3711 return (0); 3712 } 3713 3714 static moduledata_t igmp_mod = { 3715 "igmp", 3716 igmp_modevent, 3717 0 3718 }; 3719 DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE); 3720