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 #include "opt_ddb.h" 54 55 #include <sys/param.h> 56 #include <sys/systm.h> 57 #include <sys/module.h> 58 #include <sys/malloc.h> 59 #include <sys/mbuf.h> 60 #include <sys/socket.h> 61 #include <sys/kernel.h> 62 #include <sys/lock.h> 63 #include <sys/sysctl.h> 64 #include <sys/ktr.h> 65 #include <sys/condvar.h> 66 67 #ifdef DDB 68 #include <ddb/ddb.h> 69 #endif 70 71 #include <net/if.h> 72 #include <net/if_var.h> 73 #include <net/if_private.h> 74 #include <net/netisr.h> 75 #include <net/vnet.h> 76 77 #include <netinet/in.h> 78 #include <netinet/in_var.h> 79 #include <netinet/in_systm.h> 80 #include <netinet/ip.h> 81 #include <netinet/ip_var.h> 82 #include <netinet/ip_options.h> 83 #include <netinet/igmp.h> 84 #include <netinet/igmp_var.h> 85 86 #include <machine/in_cksum.h> 87 88 #include <security/mac/mac_framework.h> 89 90 #ifndef KTR_IGMPV3 91 #define KTR_IGMPV3 KTR_INET 92 #endif 93 94 #define IGMP_SLOWHZ 2 /* 2 slow timeouts per second */ 95 #define IGMP_FASTHZ 5 /* 5 fast timeouts per second */ 96 #define IGMP_RESPONSE_BURST_INTERVAL (IGMP_FASTHZ / 2) 97 98 static struct igmp_ifsoftc * 99 igi_alloc_locked(struct ifnet *); 100 static void igi_delete_locked(const struct ifnet *); 101 static void igmp_dispatch_queue(struct mbufq *, int, const int); 102 static void igmp_fasttimo_vnet(void); 103 static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 104 static int igmp_handle_state_change(struct in_multi *, 105 struct igmp_ifsoftc *); 106 static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 107 static int igmp_input_v1_query(struct ifnet *, const struct ip *, 108 const struct igmp *); 109 static int igmp_input_v2_query(struct ifnet *, const struct ip *, 110 const struct igmp *); 111 static int igmp_input_v3_query(struct ifnet *, const struct ip *, 112 /*const*/ struct igmpv3 *); 113 static int igmp_input_v3_group_query(struct in_multi *, 114 struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 115 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 116 /*const*/ struct igmp *); 117 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 118 /*const*/ struct igmp *); 119 static void igmp_intr(struct mbuf *); 120 static int igmp_isgroupreported(const struct in_addr); 121 static struct mbuf * 122 igmp_ra_alloc(void); 123 #ifdef KTR 124 static char * igmp_rec_type_to_str(const int); 125 #endif 126 static void igmp_set_version(struct igmp_ifsoftc *, const int); 127 static void igmp_slowtimo_vnet(void); 128 static int igmp_v1v2_queue_report(struct in_multi *, const int); 129 static void igmp_v1v2_process_group_timer(struct in_multi *, const int); 130 static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 131 static void igmp_v2_update_group(struct in_multi *, const int); 132 static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 133 static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 134 static struct mbuf * 135 igmp_v3_encap_report(struct ifnet *, struct mbuf *); 136 static int igmp_v3_enqueue_group_record(struct mbufq *, 137 struct in_multi *, const int, const int, const int); 138 static int igmp_v3_enqueue_filter_change(struct mbufq *, 139 struct in_multi *); 140 static void igmp_v3_process_group_timers(struct in_multi_head *, 141 struct mbufq *, struct mbufq *, struct in_multi *, 142 const int); 143 static int igmp_v3_merge_state_changes(struct in_multi *, 144 struct mbufq *); 145 static void igmp_v3_suppress_group_record(struct in_multi *); 146 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 147 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 148 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 149 static int sysctl_igmp_stat(SYSCTL_HANDLER_ARGS); 150 151 static const struct netisr_handler igmp_nh = { 152 .nh_name = "igmp", 153 .nh_handler = igmp_intr, 154 .nh_proto = NETISR_IGMP, 155 .nh_policy = NETISR_POLICY_SOURCE, 156 }; 157 158 /* 159 * System-wide globals. 160 * 161 * Unlocked access to these is OK, except for the global IGMP output 162 * queue. The IGMP subsystem lock ends up being system-wide for the moment, 163 * because all VIMAGEs have to share a global output queue, as netisrs 164 * themselves are not virtualized. 165 * 166 * Locking: 167 * * The permitted lock order is: IN_MULTI_LIST_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 168 * Any may be taken independently; if any are held at the same 169 * time, the above lock order must be followed. 170 * * All output is delegated to the netisr. 171 * Now that Giant has been eliminated, the netisr may be inlined. 172 * * IN_MULTI_LIST_LOCK covers in_multi. 173 * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 174 * including the output queue. 175 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 176 * per-link state iterators. 177 * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 178 * therefore it is not refcounted. 179 * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 180 * 181 * Reference counting 182 * * IGMP acquires its own reference every time an in_multi is passed to 183 * it and the group is being joined for the first time. 184 * * IGMP releases its reference(s) on in_multi in a deferred way, 185 * because the operations which process the release run as part of 186 * a loop whose control variables are directly affected by the release 187 * (that, and not recursing on the IF_ADDR_LOCK). 188 * 189 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 190 * to a vnet in ifp->if_vnet. 191 * 192 * SMPng: XXX We may potentially race operations on ifma_protospec. 193 * The problem is that we currently lack a clean way of taking the 194 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 195 * as anything which modifies ifma needs to be covered by that lock. 196 * So check for ifma_protospec being NULL before proceeding. 197 */ 198 struct mtx igmp_mtx; 199 200 struct mbuf *m_raopt; /* Router Alert option */ 201 static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 202 203 /* 204 * VIMAGE-wide globals. 205 * 206 * The IGMPv3 timers themselves need to run per-image, however, for 207 * historical reasons, timers run globally. This needs to be improved. 208 * An ifnet can only be in one vimage at a time, and the loopback 209 * ifnet, loif, is itself virtualized. 210 * It would otherwise be possible to seriously hose IGMP state, 211 * and create inconsistencies in upstream multicast routing, if you have 212 * multiple VIMAGEs running on the same link joining different multicast 213 * groups, UNLESS the "primary IP address" is different. This is because 214 * IGMP for IPv4 does not force link-local addresses to be used for each 215 * node, unlike MLD for IPv6. 216 * Obviously the IGMPv3 per-interface state has per-vimage granularity 217 * also as a result. 218 * 219 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 220 * policy to control the address used by IGMP on the link. 221 */ 222 VNET_DEFINE_STATIC(int, interface_timers_running); /* IGMPv3 general 223 * query response */ 224 VNET_DEFINE_STATIC(int, state_change_timers_running); /* IGMPv3 state-change 225 * retransmit */ 226 VNET_DEFINE_STATIC(int, current_state_timers_running); /* IGMPv1/v2 host 227 * report; IGMPv3 g/sg 228 * query response */ 229 230 #define V_interface_timers_running VNET(interface_timers_running) 231 #define V_state_change_timers_running VNET(state_change_timers_running) 232 #define V_current_state_timers_running VNET(current_state_timers_running) 233 234 VNET_PCPUSTAT_DEFINE(struct igmpstat, igmpstat); 235 VNET_PCPUSTAT_SYSINIT(igmpstat); 236 VNET_PCPUSTAT_SYSUNINIT(igmpstat); 237 238 VNET_DEFINE_STATIC(LIST_HEAD(, igmp_ifsoftc), igi_head) = 239 LIST_HEAD_INITIALIZER(igi_head); 240 VNET_DEFINE_STATIC(struct timeval, igmp_gsrdelay) = {10, 0}; 241 242 #define V_igi_head VNET(igi_head) 243 #define V_igmp_gsrdelay VNET(igmp_gsrdelay) 244 245 VNET_DEFINE_STATIC(int, igmp_recvifkludge) = 1; 246 VNET_DEFINE_STATIC(int, igmp_sendra) = 1; 247 VNET_DEFINE_STATIC(int, igmp_sendlocal) = 1; 248 VNET_DEFINE_STATIC(int, igmp_v1enable) = 1; 249 VNET_DEFINE_STATIC(int, igmp_v2enable) = 1; 250 VNET_DEFINE_STATIC(int, igmp_legacysupp); 251 VNET_DEFINE_STATIC(int, igmp_default_version) = IGMP_VERSION_3; 252 253 #define V_igmp_recvifkludge VNET(igmp_recvifkludge) 254 #define V_igmp_sendra VNET(igmp_sendra) 255 #define V_igmp_sendlocal VNET(igmp_sendlocal) 256 #define V_igmp_v1enable VNET(igmp_v1enable) 257 #define V_igmp_v2enable VNET(igmp_v2enable) 258 #define V_igmp_legacysupp VNET(igmp_legacysupp) 259 #define V_igmp_default_version VNET(igmp_default_version) 260 261 /* 262 * Virtualized sysctls. 263 */ 264 SYSCTL_PROC(_net_inet_igmp, IGMPCTL_STATS, stats, 265 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_MPSAFE, 266 &VNET_NAME(igmpstat), 0, sysctl_igmp_stat, "S,igmpstat", 267 "IGMP statistics (struct igmpstat, netinet/igmp_var.h)"); 268 SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 269 &VNET_NAME(igmp_recvifkludge), 0, 270 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 271 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 272 &VNET_NAME(igmp_sendra), 0, 273 "Send IP Router Alert option in IGMPv2/v3 messages"); 274 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 275 &VNET_NAME(igmp_sendlocal), 0, 276 "Send IGMP membership reports for 224.0.0.0/24 groups"); 277 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 278 &VNET_NAME(igmp_v1enable), 0, 279 "Enable backwards compatibility with IGMPv1"); 280 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 281 &VNET_NAME(igmp_v2enable), 0, 282 "Enable backwards compatibility with IGMPv2"); 283 SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 284 &VNET_NAME(igmp_legacysupp), 0, 285 "Allow v1/v2 reports to suppress v3 group responses"); 286 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 287 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 288 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 289 "Default version of IGMP to run on each interface"); 290 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 291 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 292 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 293 "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 294 295 /* 296 * Non-virtualized sysctls. 297 */ 298 static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 299 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 300 "Per-interface IGMPv3 state"); 301 302 static __inline void 303 igmp_save_context(struct mbuf *m, struct ifnet *ifp) 304 { 305 306 #ifdef VIMAGE 307 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 308 #endif /* VIMAGE */ 309 m->m_pkthdr.rcvif = ifp; 310 m->m_pkthdr.flowid = ifp->if_index; 311 } 312 313 static __inline void 314 igmp_scrub_context(struct mbuf *m) 315 { 316 317 m->m_pkthdr.PH_loc.ptr = NULL; 318 m->m_pkthdr.flowid = 0; 319 } 320 321 /* 322 * Restore context from a queued IGMP output chain. 323 * Return saved ifindex. 324 * 325 * VIMAGE: The assertion is there to make sure that we 326 * actually called CURVNET_SET() with what's in the mbuf chain. 327 */ 328 static __inline uint32_t 329 igmp_restore_context(struct mbuf *m) 330 { 331 332 #ifdef notyet 333 #if defined(VIMAGE) && defined(INVARIANTS) 334 KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 335 ("%s: called when curvnet was not restored", __func__)); 336 #endif 337 #endif 338 return (m->m_pkthdr.flowid); 339 } 340 341 /* 342 * IGMP statistics. 343 */ 344 static int 345 sysctl_igmp_stat(SYSCTL_HANDLER_ARGS) 346 { 347 struct igmpstat igps0; 348 int error; 349 char *p; 350 351 error = sysctl_wire_old_buffer(req, sizeof(struct igmpstat)); 352 if (error) 353 return (error); 354 355 if (req->oldptr != NULL) { 356 if (req->oldlen < sizeof(struct igmpstat)) 357 error = ENOMEM; 358 else { 359 /* 360 * Copy the counters, and explicitly set the struct's 361 * version and length fields. 362 */ 363 COUNTER_ARRAY_COPY(VNET(igmpstat), &igps0, 364 sizeof(struct igmpstat) / sizeof(uint64_t)); 365 igps0.igps_version = IGPS_VERSION_3; 366 igps0.igps_len = IGPS_VERSION3_LEN; 367 error = SYSCTL_OUT(req, &igps0, 368 sizeof(struct igmpstat)); 369 } 370 } else 371 req->validlen = sizeof(struct igmpstat); 372 if (error) 373 goto out; 374 if (req->newptr != NULL) { 375 if (req->newlen < sizeof(struct igmpstat)) 376 error = ENOMEM; 377 else 378 error = SYSCTL_IN(req, &igps0, 379 sizeof(igps0)); 380 if (error) 381 goto out; 382 /* 383 * igps0 must be "all zero". 384 */ 385 p = (char *)&igps0; 386 while (p < (char *)&igps0 + sizeof(igps0) && *p == '\0') 387 p++; 388 if (p != (char *)&igps0 + sizeof(igps0)) { 389 error = EINVAL; 390 goto out; 391 } 392 COUNTER_ARRAY_ZERO(VNET(igmpstat), 393 sizeof(struct igmpstat) / sizeof(uint64_t)); 394 } 395 out: 396 return (error); 397 } 398 399 /* 400 * Retrieve or set default IGMP version. 401 * 402 * VIMAGE: Assume curvnet set by caller. 403 * SMPng: NOTE: Serialized by IGMP lock. 404 */ 405 static int 406 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 407 { 408 int error; 409 int new; 410 411 error = sysctl_wire_old_buffer(req, sizeof(int)); 412 if (error) 413 return (error); 414 415 IGMP_LOCK(); 416 417 new = V_igmp_default_version; 418 419 error = sysctl_handle_int(oidp, &new, 0, req); 420 if (error || !req->newptr) 421 goto out_locked; 422 423 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 424 error = EINVAL; 425 goto out_locked; 426 } 427 428 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 429 V_igmp_default_version, new); 430 431 V_igmp_default_version = new; 432 433 out_locked: 434 IGMP_UNLOCK(); 435 return (error); 436 } 437 438 /* 439 * Retrieve or set threshold between group-source queries in seconds. 440 * 441 * VIMAGE: Assume curvnet set by caller. 442 * SMPng: NOTE: Serialized by IGMP lock. 443 */ 444 static int 445 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 446 { 447 int error; 448 int i; 449 450 error = sysctl_wire_old_buffer(req, sizeof(int)); 451 if (error) 452 return (error); 453 454 IGMP_LOCK(); 455 456 i = V_igmp_gsrdelay.tv_sec; 457 458 error = sysctl_handle_int(oidp, &i, 0, req); 459 if (error || !req->newptr) 460 goto out_locked; 461 462 if (i < -1 || i >= 60) { 463 error = EINVAL; 464 goto out_locked; 465 } 466 467 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 468 V_igmp_gsrdelay.tv_sec, i); 469 V_igmp_gsrdelay.tv_sec = i; 470 471 out_locked: 472 IGMP_UNLOCK(); 473 return (error); 474 } 475 476 /* 477 * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 478 * For use by ifmcstat(8). 479 * 480 * SMPng: NOTE: Does an unlocked ifindex space read. 481 * VIMAGE: Assume curvnet set by caller. The node handler itself 482 * is not directly virtualized. 483 */ 484 static int 485 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 486 { 487 struct epoch_tracker et; 488 int *name; 489 int error; 490 u_int namelen; 491 struct ifnet *ifp; 492 struct igmp_ifsoftc *igi; 493 494 name = (int *)arg1; 495 namelen = arg2; 496 497 if (req->newptr != NULL) 498 return (EPERM); 499 500 if (namelen != 1) 501 return (EINVAL); 502 503 error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo)); 504 if (error) 505 return (error); 506 507 IN_MULTI_LIST_LOCK(); 508 IGMP_LOCK(); 509 510 error = ENOENT; 511 512 NET_EPOCH_ENTER(et); 513 ifp = ifnet_byindex(name[0]); 514 NET_EPOCH_EXIT(et); 515 if (ifp == NULL) 516 goto out_locked; 517 518 LIST_FOREACH(igi, &V_igi_head, igi_link) { 519 if (ifp == igi->igi_ifp) { 520 struct igmp_ifinfo info; 521 522 info.igi_version = igi->igi_version; 523 info.igi_v1_timer = igi->igi_v1_timer; 524 info.igi_v2_timer = igi->igi_v2_timer; 525 info.igi_v3_timer = igi->igi_v3_timer; 526 info.igi_flags = igi->igi_flags; 527 info.igi_rv = igi->igi_rv; 528 info.igi_qi = igi->igi_qi; 529 info.igi_qri = igi->igi_qri; 530 info.igi_uri = igi->igi_uri; 531 error = SYSCTL_OUT(req, &info, sizeof(info)); 532 break; 533 } 534 } 535 536 out_locked: 537 IGMP_UNLOCK(); 538 IN_MULTI_LIST_UNLOCK(); 539 return (error); 540 } 541 542 /* 543 * Dispatch an entire queue of pending packet chains 544 * using the netisr. 545 * VIMAGE: Assumes the vnet pointer has been set. 546 */ 547 static void 548 igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 549 { 550 struct epoch_tracker et; 551 struct mbuf *m; 552 553 NET_EPOCH_ENTER(et); 554 while ((m = mbufq_dequeue(mq)) != NULL) { 555 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 556 if (loop) 557 m->m_flags |= M_IGMP_LOOP; 558 netisr_dispatch(NETISR_IGMP, m); 559 if (--limit == 0) 560 break; 561 } 562 NET_EPOCH_EXIT(et); 563 } 564 565 /* 566 * Filter outgoing IGMP report state by group. 567 * 568 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 569 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 570 * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 571 * this may break certain IGMP snooping switches which rely on the old 572 * report behaviour. 573 * 574 * Return zero if the given group is one for which IGMP reports 575 * should be suppressed, or non-zero if reports should be issued. 576 */ 577 static __inline int 578 igmp_isgroupreported(const struct in_addr addr) 579 { 580 581 if (in_allhosts(addr) || 582 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 583 return (0); 584 585 return (1); 586 } 587 588 /* 589 * Construct a Router Alert option to use in outgoing packets. 590 */ 591 static struct mbuf * 592 igmp_ra_alloc(void) 593 { 594 struct mbuf *m; 595 struct ipoption *p; 596 597 m = m_get(M_WAITOK, MT_DATA); 598 p = mtod(m, struct ipoption *); 599 p->ipopt_dst.s_addr = INADDR_ANY; 600 p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 601 p->ipopt_list[1] = 0x04; /* 4 bytes long */ 602 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 603 p->ipopt_list[3] = 0x00; /* pad byte */ 604 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 605 606 return (m); 607 } 608 609 /* 610 * Attach IGMP when PF_INET is attached to an interface. 611 */ 612 struct igmp_ifsoftc * 613 igmp_domifattach(struct ifnet *ifp) 614 { 615 struct igmp_ifsoftc *igi; 616 617 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 618 __func__, ifp, ifp->if_xname); 619 620 IGMP_LOCK(); 621 622 igi = igi_alloc_locked(ifp); 623 if (!(ifp->if_flags & IFF_MULTICAST)) 624 igi->igi_flags |= IGIF_SILENT; 625 626 IGMP_UNLOCK(); 627 628 return (igi); 629 } 630 631 /* 632 * VIMAGE: assume curvnet set by caller. 633 */ 634 static struct igmp_ifsoftc * 635 igi_alloc_locked(/*const*/ struct ifnet *ifp) 636 { 637 struct igmp_ifsoftc *igi; 638 639 IGMP_LOCK_ASSERT(); 640 641 igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 642 if (igi == NULL) 643 goto out; 644 645 igi->igi_ifp = ifp; 646 igi->igi_version = V_igmp_default_version; 647 igi->igi_flags = 0; 648 igi->igi_rv = IGMP_RV_INIT; 649 igi->igi_qi = IGMP_QI_INIT; 650 igi->igi_qri = IGMP_QRI_INIT; 651 igi->igi_uri = IGMP_URI_INIT; 652 mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 653 654 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 655 656 CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 657 ifp, ifp->if_xname); 658 659 out: 660 return (igi); 661 } 662 663 /* 664 * Hook for ifdetach. 665 * 666 * NOTE: Some finalization tasks need to run before the protocol domain 667 * is detached, but also before the link layer does its cleanup. 668 * 669 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 670 * XXX This is also bitten by unlocked ifma_protospec access. 671 */ 672 void 673 igmp_ifdetach(struct ifnet *ifp) 674 { 675 struct epoch_tracker et; 676 struct igmp_ifsoftc *igi; 677 struct ifmultiaddr *ifma; 678 struct in_multi *inm; 679 struct in_multi_head inm_free_tmp; 680 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 681 ifp->if_xname); 682 683 SLIST_INIT(&inm_free_tmp); 684 IGMP_LOCK(); 685 686 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 687 if (igi->igi_version == IGMP_VERSION_3) { 688 IF_ADDR_WLOCK(ifp); 689 NET_EPOCH_ENTER(et); 690 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 691 inm = inm_ifmultiaddr_get_inm(ifma); 692 if (inm == NULL) 693 continue; 694 if (inm->inm_state == IGMP_LEAVING_MEMBER) 695 inm_rele_locked(&inm_free_tmp, inm); 696 inm_clear_recorded(inm); 697 } 698 NET_EPOCH_EXIT(et); 699 IF_ADDR_WUNLOCK(ifp); 700 inm_release_list_deferred(&inm_free_tmp); 701 } 702 IGMP_UNLOCK(); 703 704 } 705 706 /* 707 * Hook for domifdetach. 708 */ 709 void 710 igmp_domifdetach(struct ifnet *ifp) 711 { 712 713 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 714 __func__, ifp, ifp->if_xname); 715 716 IGMP_LOCK(); 717 igi_delete_locked(ifp); 718 IGMP_UNLOCK(); 719 } 720 721 static void 722 igi_delete_locked(const struct ifnet *ifp) 723 { 724 struct igmp_ifsoftc *igi, *tigi; 725 726 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 727 __func__, ifp, ifp->if_xname); 728 729 IGMP_LOCK_ASSERT(); 730 731 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 732 if (igi->igi_ifp == ifp) { 733 /* 734 * Free deferred General Query responses. 735 */ 736 mbufq_drain(&igi->igi_gq); 737 738 LIST_REMOVE(igi, igi_link); 739 free(igi, M_IGMP); 740 return; 741 } 742 } 743 } 744 745 /* 746 * Process a received IGMPv1 query. 747 * Return non-zero if the message should be dropped. 748 * 749 * VIMAGE: The curvnet pointer is derived from the input ifp. 750 */ 751 static int 752 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 753 const struct igmp *igmp) 754 { 755 struct ifmultiaddr *ifma; 756 struct igmp_ifsoftc *igi; 757 struct in_multi *inm; 758 759 NET_EPOCH_ASSERT(); 760 761 /* 762 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 763 * 224.0.0.1. They are always treated as General Queries. 764 * igmp_group is always ignored. Do not drop it as a userland 765 * daemon may wish to see it. 766 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 767 */ 768 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 769 IGMPSTAT_INC(igps_rcv_badqueries); 770 return (0); 771 } 772 IGMPSTAT_INC(igps_rcv_gen_queries); 773 774 IN_MULTI_LIST_LOCK(); 775 IGMP_LOCK(); 776 777 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 778 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 779 780 if (igi->igi_flags & IGIF_LOOPBACK) { 781 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 782 ifp, ifp->if_xname); 783 goto out_locked; 784 } 785 786 /* 787 * Switch to IGMPv1 host compatibility mode. 788 */ 789 igmp_set_version(igi, IGMP_VERSION_1); 790 791 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 792 793 /* 794 * Start the timers in all of our group records 795 * for the interface on which the query arrived, 796 * except those which are already running. 797 */ 798 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 799 inm = inm_ifmultiaddr_get_inm(ifma); 800 if (inm == NULL) 801 continue; 802 if (inm->inm_timer != 0) 803 continue; 804 switch (inm->inm_state) { 805 case IGMP_NOT_MEMBER: 806 case IGMP_SILENT_MEMBER: 807 break; 808 case IGMP_G_QUERY_PENDING_MEMBER: 809 case IGMP_SG_QUERY_PENDING_MEMBER: 810 case IGMP_REPORTING_MEMBER: 811 case IGMP_IDLE_MEMBER: 812 case IGMP_LAZY_MEMBER: 813 case IGMP_SLEEPING_MEMBER: 814 case IGMP_AWAKENING_MEMBER: 815 inm->inm_state = IGMP_REPORTING_MEMBER; 816 inm->inm_timer = IGMP_RANDOM_DELAY( 817 IGMP_V1V2_MAX_RI * IGMP_FASTHZ); 818 V_current_state_timers_running = 1; 819 break; 820 case IGMP_LEAVING_MEMBER: 821 break; 822 } 823 } 824 825 out_locked: 826 IGMP_UNLOCK(); 827 IN_MULTI_LIST_UNLOCK(); 828 829 return (0); 830 } 831 832 /* 833 * Process a received IGMPv2 general or group-specific query. 834 */ 835 static int 836 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 837 const struct igmp *igmp) 838 { 839 struct ifmultiaddr *ifma; 840 struct igmp_ifsoftc *igi; 841 struct in_multi *inm; 842 int is_general_query; 843 uint16_t timer; 844 845 NET_EPOCH_ASSERT(); 846 847 is_general_query = 0; 848 849 /* 850 * Validate address fields upfront. 851 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 852 */ 853 if (in_nullhost(igmp->igmp_group)) { 854 /* 855 * IGMPv2 General Query. 856 * If this was not sent to the all-hosts group, ignore it. 857 */ 858 if (!in_allhosts(ip->ip_dst)) 859 return (0); 860 IGMPSTAT_INC(igps_rcv_gen_queries); 861 is_general_query = 1; 862 } else { 863 /* IGMPv2 Group-Specific Query. */ 864 IGMPSTAT_INC(igps_rcv_group_queries); 865 } 866 867 IN_MULTI_LIST_LOCK(); 868 IGMP_LOCK(); 869 870 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 871 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 872 873 if (igi->igi_flags & IGIF_LOOPBACK) { 874 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 875 ifp, ifp->if_xname); 876 goto out_locked; 877 } 878 879 /* 880 * Ignore v2 query if in v1 Compatibility Mode. 881 */ 882 if (igi->igi_version == IGMP_VERSION_1) 883 goto out_locked; 884 885 igmp_set_version(igi, IGMP_VERSION_2); 886 887 timer = igmp->igmp_code * IGMP_FASTHZ / IGMP_TIMER_SCALE; 888 if (timer == 0) 889 timer = 1; 890 891 if (is_general_query) { 892 /* 893 * For each reporting group joined on this 894 * interface, kick the report timer. 895 */ 896 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 897 ifp, ifp->if_xname); 898 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 899 inm = inm_ifmultiaddr_get_inm(ifma); 900 if (inm == NULL) 901 continue; 902 igmp_v2_update_group(inm, timer); 903 } 904 } else { 905 /* 906 * Group-specific IGMPv2 query, we need only 907 * look up the single group to process it. 908 */ 909 inm = inm_lookup(ifp, igmp->igmp_group); 910 if (inm != NULL) { 911 CTR3(KTR_IGMPV3, 912 "process v2 query 0x%08x on ifp %p(%s)", 913 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 914 igmp_v2_update_group(inm, timer); 915 } 916 } 917 918 out_locked: 919 IGMP_UNLOCK(); 920 IN_MULTI_LIST_UNLOCK(); 921 922 return (0); 923 } 924 925 /* 926 * Update the report timer on a group in response to an IGMPv2 query. 927 * 928 * If we are becoming the reporting member for this group, start the timer. 929 * If we already are the reporting member for this group, and timer is 930 * below the threshold, reset it. 931 * 932 * We may be updating the group for the first time since we switched 933 * to IGMPv3. If we are, then we must clear any recorded source lists, 934 * and transition to REPORTING state; the group timer is overloaded 935 * for group and group-source query responses. 936 * 937 * Unlike IGMPv3, the delay per group should be jittered 938 * to avoid bursts of IGMPv2 reports. 939 */ 940 static void 941 igmp_v2_update_group(struct in_multi *inm, const int timer) 942 { 943 944 CTR4(KTR_IGMPV3, "0x%08x: %s/%s timer=%d", __func__, 945 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname, timer); 946 947 IN_MULTI_LIST_LOCK_ASSERT(); 948 949 switch (inm->inm_state) { 950 case IGMP_NOT_MEMBER: 951 case IGMP_SILENT_MEMBER: 952 break; 953 case IGMP_REPORTING_MEMBER: 954 if (inm->inm_timer != 0 && 955 inm->inm_timer <= timer) { 956 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 957 "skipping.", __func__); 958 break; 959 } 960 /* FALLTHROUGH */ 961 case IGMP_SG_QUERY_PENDING_MEMBER: 962 case IGMP_G_QUERY_PENDING_MEMBER: 963 case IGMP_IDLE_MEMBER: 964 case IGMP_LAZY_MEMBER: 965 case IGMP_AWAKENING_MEMBER: 966 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 967 inm->inm_state = IGMP_REPORTING_MEMBER; 968 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 969 V_current_state_timers_running = 1; 970 break; 971 case IGMP_SLEEPING_MEMBER: 972 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 973 inm->inm_state = IGMP_AWAKENING_MEMBER; 974 break; 975 case IGMP_LEAVING_MEMBER: 976 break; 977 } 978 } 979 980 /* 981 * Process a received IGMPv3 general, group-specific or 982 * group-and-source-specific query. 983 * Assumes m has already been pulled up to the full IGMP message length. 984 * Return 0 if successful, otherwise an appropriate error code is returned. 985 */ 986 static int 987 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 988 /*const*/ struct igmpv3 *igmpv3) 989 { 990 struct igmp_ifsoftc *igi; 991 struct in_multi *inm; 992 int is_general_query; 993 uint32_t maxresp, nsrc, qqi; 994 uint16_t timer; 995 uint8_t qrv; 996 997 is_general_query = 0; 998 999 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 1000 1001 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 1002 if (maxresp >= 128) { 1003 maxresp = IGMP_MANT(igmpv3->igmp_code) << 1004 (IGMP_EXP(igmpv3->igmp_code) + 3); 1005 } 1006 1007 /* 1008 * Robustness must never be less than 2 for on-wire IGMPv3. 1009 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 1010 * an exception for interfaces whose IGMPv3 state changes 1011 * are redirected to loopback (e.g. MANET). 1012 */ 1013 qrv = IGMP_QRV(igmpv3->igmp_misc); 1014 if (qrv < 2) { 1015 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 1016 qrv, IGMP_RV_INIT); 1017 qrv = IGMP_RV_INIT; 1018 } 1019 1020 qqi = igmpv3->igmp_qqi; 1021 if (qqi >= 128) { 1022 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 1023 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 1024 } 1025 1026 timer = maxresp * IGMP_FASTHZ / IGMP_TIMER_SCALE; 1027 if (timer == 0) 1028 timer = 1; 1029 1030 nsrc = ntohs(igmpv3->igmp_numsrc); 1031 1032 /* 1033 * Validate address fields and versions upfront before 1034 * accepting v3 query. 1035 * XXX SMPng: Unlocked access to igmpstat counters here. 1036 */ 1037 if (in_nullhost(igmpv3->igmp_group)) { 1038 /* 1039 * IGMPv3 General Query. 1040 * 1041 * General Queries SHOULD be directed to 224.0.0.1. 1042 * A general query with a source list has undefined 1043 * behaviour; discard it. 1044 */ 1045 IGMPSTAT_INC(igps_rcv_gen_queries); 1046 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1047 IGMPSTAT_INC(igps_rcv_badqueries); 1048 return (0); 1049 } 1050 is_general_query = 1; 1051 } else { 1052 /* Group or group-source specific query. */ 1053 if (nsrc == 0) 1054 IGMPSTAT_INC(igps_rcv_group_queries); 1055 else 1056 IGMPSTAT_INC(igps_rcv_gsr_queries); 1057 } 1058 1059 IN_MULTI_LIST_LOCK(); 1060 IGMP_LOCK(); 1061 1062 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1063 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1064 1065 if (igi->igi_flags & IGIF_LOOPBACK) { 1066 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1067 ifp, ifp->if_xname); 1068 goto out_locked; 1069 } 1070 1071 /* 1072 * Discard the v3 query if we're in Compatibility Mode. 1073 * The RFC is not obviously worded that hosts need to stay in 1074 * compatibility mode until the Old Version Querier Present 1075 * timer expires. 1076 */ 1077 if (igi->igi_version != IGMP_VERSION_3) { 1078 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1079 igi->igi_version, ifp, ifp->if_xname); 1080 goto out_locked; 1081 } 1082 1083 igmp_set_version(igi, IGMP_VERSION_3); 1084 igi->igi_rv = qrv; 1085 igi->igi_qi = qqi; 1086 igi->igi_qri = maxresp; 1087 1088 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1089 maxresp); 1090 1091 if (is_general_query) { 1092 /* 1093 * Schedule a current-state report on this ifp for 1094 * all groups, possibly containing source lists. 1095 * If there is a pending General Query response 1096 * scheduled earlier than the selected delay, do 1097 * not schedule any other reports. 1098 * Otherwise, reset the interface timer. 1099 */ 1100 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1101 ifp, ifp->if_xname); 1102 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1103 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1104 V_interface_timers_running = 1; 1105 } 1106 } else { 1107 /* 1108 * Group-source-specific queries are throttled on 1109 * a per-group basis to defeat denial-of-service attempts. 1110 * Queries for groups we are not a member of on this 1111 * link are simply ignored. 1112 */ 1113 inm = inm_lookup(ifp, igmpv3->igmp_group); 1114 if (inm == NULL) 1115 goto out_locked; 1116 if (nsrc > 0) { 1117 if (!ratecheck(&inm->inm_lastgsrtv, 1118 &V_igmp_gsrdelay)) { 1119 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1120 __func__); 1121 IGMPSTAT_INC(igps_drop_gsr_queries); 1122 goto out_locked; 1123 } 1124 } 1125 CTR3(KTR_IGMPV3, "process v3 0x%08x query on ifp %p(%s)", 1126 ntohl(igmpv3->igmp_group.s_addr), ifp, ifp->if_xname); 1127 /* 1128 * If there is a pending General Query response 1129 * scheduled sooner than the selected delay, no 1130 * further report need be scheduled. 1131 * Otherwise, prepare to respond to the 1132 * group-specific or group-and-source query. 1133 */ 1134 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1135 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1136 } 1137 1138 out_locked: 1139 IGMP_UNLOCK(); 1140 IN_MULTI_LIST_UNLOCK(); 1141 1142 return (0); 1143 } 1144 1145 /* 1146 * Process a received IGMPv3 group-specific or group-and-source-specific 1147 * query. 1148 * Return <0 if any error occurred. Currently this is ignored. 1149 */ 1150 static int 1151 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1152 int timer, /*const*/ struct igmpv3 *igmpv3) 1153 { 1154 int retval; 1155 uint16_t nsrc; 1156 1157 IN_MULTI_LIST_LOCK_ASSERT(); 1158 IGMP_LOCK_ASSERT(); 1159 1160 retval = 0; 1161 1162 switch (inm->inm_state) { 1163 case IGMP_NOT_MEMBER: 1164 case IGMP_SILENT_MEMBER: 1165 case IGMP_SLEEPING_MEMBER: 1166 case IGMP_LAZY_MEMBER: 1167 case IGMP_AWAKENING_MEMBER: 1168 case IGMP_IDLE_MEMBER: 1169 case IGMP_LEAVING_MEMBER: 1170 return (retval); 1171 break; 1172 case IGMP_REPORTING_MEMBER: 1173 case IGMP_G_QUERY_PENDING_MEMBER: 1174 case IGMP_SG_QUERY_PENDING_MEMBER: 1175 break; 1176 } 1177 1178 nsrc = ntohs(igmpv3->igmp_numsrc); 1179 1180 /* 1181 * Deal with group-specific queries upfront. 1182 * If any group query is already pending, purge any recorded 1183 * source-list state if it exists, and schedule a query response 1184 * for this group-specific query. 1185 */ 1186 if (nsrc == 0) { 1187 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1188 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1189 inm_clear_recorded(inm); 1190 timer = min(inm->inm_timer, timer); 1191 } 1192 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1193 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1194 V_current_state_timers_running = 1; 1195 return (retval); 1196 } 1197 1198 /* 1199 * Deal with the case where a group-and-source-specific query has 1200 * been received but a group-specific query is already pending. 1201 */ 1202 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1203 timer = min(inm->inm_timer, timer); 1204 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1205 V_current_state_timers_running = 1; 1206 return (retval); 1207 } 1208 1209 /* 1210 * Finally, deal with the case where a group-and-source-specific 1211 * query has been received, where a response to a previous g-s-r 1212 * query exists, or none exists. 1213 * In this case, we need to parse the source-list which the Querier 1214 * has provided us with and check if we have any source list filter 1215 * entries at T1 for these sources. If we do not, there is no need 1216 * schedule a report and the query may be dropped. 1217 * If we do, we must record them and schedule a current-state 1218 * report for those sources. 1219 * FIXME: Handling source lists larger than 1 mbuf requires that 1220 * we pass the mbuf chain pointer down to this function, and use 1221 * m_getptr() to walk the chain. 1222 */ 1223 if (inm->inm_nsrc > 0) { 1224 const struct in_addr *ap; 1225 int i, nrecorded; 1226 1227 ap = (const struct in_addr *)(igmpv3 + 1); 1228 nrecorded = 0; 1229 for (i = 0; i < nsrc; i++, ap++) { 1230 retval = inm_record_source(inm, ap->s_addr); 1231 if (retval < 0) 1232 break; 1233 nrecorded += retval; 1234 } 1235 if (nrecorded > 0) { 1236 CTR1(KTR_IGMPV3, 1237 "%s: schedule response to SG query", __func__); 1238 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1239 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1240 V_current_state_timers_running = 1; 1241 } 1242 } 1243 1244 return (retval); 1245 } 1246 1247 /* 1248 * Process a received IGMPv1 host membership report. 1249 * 1250 * NOTE: 0.0.0.0 workaround breaks const correctness. 1251 */ 1252 static int 1253 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1254 /*const*/ struct igmp *igmp) 1255 { 1256 struct in_ifaddr *ia; 1257 struct in_multi *inm; 1258 1259 IGMPSTAT_INC(igps_rcv_reports); 1260 1261 if (ifp->if_flags & IFF_LOOPBACK) 1262 return (0); 1263 1264 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1265 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1266 IGMPSTAT_INC(igps_rcv_badreports); 1267 return (EINVAL); 1268 } 1269 1270 /* 1271 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1272 * Booting clients may use the source address 0.0.0.0. Some 1273 * IGMP daemons may not know how to use IP_RECVIF to determine 1274 * the interface upon which this message was received. 1275 * Replace 0.0.0.0 with the subnet address if told to do so. 1276 */ 1277 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1278 IFP_TO_IA(ifp, ia); 1279 if (ia != NULL) 1280 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1281 } 1282 1283 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1284 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1285 1286 /* 1287 * IGMPv1 report suppression. 1288 * If we are a member of this group, and our membership should be 1289 * reported, stop our group timer and transition to the 'lazy' state. 1290 */ 1291 IN_MULTI_LIST_LOCK(); 1292 inm = inm_lookup(ifp, igmp->igmp_group); 1293 if (inm != NULL) { 1294 struct igmp_ifsoftc *igi; 1295 1296 igi = inm->inm_igi; 1297 if (igi == NULL) { 1298 KASSERT(igi != NULL, 1299 ("%s: no igi for ifp %p", __func__, ifp)); 1300 goto out_locked; 1301 } 1302 1303 IGMPSTAT_INC(igps_rcv_ourreports); 1304 1305 /* 1306 * If we are in IGMPv3 host mode, do not allow the 1307 * other host's IGMPv1 report to suppress our reports 1308 * unless explicitly configured to do so. 1309 */ 1310 if (igi->igi_version == IGMP_VERSION_3) { 1311 if (V_igmp_legacysupp) 1312 igmp_v3_suppress_group_record(inm); 1313 goto out_locked; 1314 } 1315 1316 inm->inm_timer = 0; 1317 1318 switch (inm->inm_state) { 1319 case IGMP_NOT_MEMBER: 1320 case IGMP_SILENT_MEMBER: 1321 break; 1322 case IGMP_IDLE_MEMBER: 1323 case IGMP_LAZY_MEMBER: 1324 case IGMP_AWAKENING_MEMBER: 1325 CTR3(KTR_IGMPV3, 1326 "report suppressed for 0x%08x on ifp %p(%s)", 1327 ntohl(igmp->igmp_group.s_addr), ifp, 1328 ifp->if_xname); 1329 case IGMP_SLEEPING_MEMBER: 1330 inm->inm_state = IGMP_SLEEPING_MEMBER; 1331 break; 1332 case IGMP_REPORTING_MEMBER: 1333 CTR3(KTR_IGMPV3, 1334 "report suppressed for 0x%08x on ifp %p(%s)", 1335 ntohl(igmp->igmp_group.s_addr), ifp, 1336 ifp->if_xname); 1337 if (igi->igi_version == IGMP_VERSION_1) 1338 inm->inm_state = IGMP_LAZY_MEMBER; 1339 else if (igi->igi_version == IGMP_VERSION_2) 1340 inm->inm_state = IGMP_SLEEPING_MEMBER; 1341 break; 1342 case IGMP_G_QUERY_PENDING_MEMBER: 1343 case IGMP_SG_QUERY_PENDING_MEMBER: 1344 case IGMP_LEAVING_MEMBER: 1345 break; 1346 } 1347 } 1348 1349 out_locked: 1350 IN_MULTI_LIST_UNLOCK(); 1351 1352 return (0); 1353 } 1354 1355 /* 1356 * Process a received IGMPv2 host membership report. 1357 * 1358 * NOTE: 0.0.0.0 workaround breaks const correctness. 1359 */ 1360 static int 1361 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1362 /*const*/ struct igmp *igmp) 1363 { 1364 struct in_ifaddr *ia; 1365 struct in_multi *inm; 1366 1367 /* 1368 * Make sure we don't hear our own membership report. Fast 1369 * leave requires knowing that we are the only member of a 1370 * group. 1371 */ 1372 IFP_TO_IA(ifp, ia); 1373 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1374 return (0); 1375 } 1376 1377 IGMPSTAT_INC(igps_rcv_reports); 1378 1379 if (ifp->if_flags & IFF_LOOPBACK) { 1380 return (0); 1381 } 1382 1383 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1384 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1385 IGMPSTAT_INC(igps_rcv_badreports); 1386 return (EINVAL); 1387 } 1388 1389 /* 1390 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1391 * Booting clients may use the source address 0.0.0.0. Some 1392 * IGMP daemons may not know how to use IP_RECVIF to determine 1393 * the interface upon which this message was received. 1394 * Replace 0.0.0.0 with the subnet address if told to do so. 1395 */ 1396 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1397 if (ia != NULL) 1398 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1399 } 1400 1401 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1402 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1403 1404 /* 1405 * IGMPv2 report suppression. 1406 * If we are a member of this group, and our membership should be 1407 * reported, and our group timer is pending or about to be reset, 1408 * stop our group timer by transitioning to the 'lazy' state. 1409 */ 1410 IN_MULTI_LIST_LOCK(); 1411 inm = inm_lookup(ifp, igmp->igmp_group); 1412 if (inm != NULL) { 1413 struct igmp_ifsoftc *igi; 1414 1415 igi = inm->inm_igi; 1416 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1417 1418 IGMPSTAT_INC(igps_rcv_ourreports); 1419 1420 /* 1421 * If we are in IGMPv3 host mode, do not allow the 1422 * other host's IGMPv1 report to suppress our reports 1423 * unless explicitly configured to do so. 1424 */ 1425 if (igi->igi_version == IGMP_VERSION_3) { 1426 if (V_igmp_legacysupp) 1427 igmp_v3_suppress_group_record(inm); 1428 goto out_locked; 1429 } 1430 1431 inm->inm_timer = 0; 1432 1433 switch (inm->inm_state) { 1434 case IGMP_NOT_MEMBER: 1435 case IGMP_SILENT_MEMBER: 1436 case IGMP_SLEEPING_MEMBER: 1437 break; 1438 case IGMP_REPORTING_MEMBER: 1439 case IGMP_IDLE_MEMBER: 1440 case IGMP_AWAKENING_MEMBER: 1441 CTR3(KTR_IGMPV3, 1442 "report suppressed for 0x%08x on ifp %p(%s)", 1443 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1444 case IGMP_LAZY_MEMBER: 1445 inm->inm_state = IGMP_LAZY_MEMBER; 1446 break; 1447 case IGMP_G_QUERY_PENDING_MEMBER: 1448 case IGMP_SG_QUERY_PENDING_MEMBER: 1449 case IGMP_LEAVING_MEMBER: 1450 break; 1451 } 1452 } 1453 1454 out_locked: 1455 IN_MULTI_LIST_UNLOCK(); 1456 1457 return (0); 1458 } 1459 1460 int 1461 igmp_input(struct mbuf **mp, int *offp, int proto) 1462 { 1463 int iphlen; 1464 struct ifnet *ifp; 1465 struct igmp *igmp; 1466 struct ip *ip; 1467 struct mbuf *m; 1468 int igmplen; 1469 int minlen; 1470 int queryver; 1471 1472 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1473 1474 m = *mp; 1475 ifp = m->m_pkthdr.rcvif; 1476 *mp = NULL; 1477 1478 IGMPSTAT_INC(igps_rcv_total); 1479 1480 ip = mtod(m, struct ip *); 1481 iphlen = *offp; 1482 igmplen = ntohs(ip->ip_len) - iphlen; 1483 1484 /* 1485 * Validate lengths. 1486 */ 1487 if (igmplen < IGMP_MINLEN) { 1488 IGMPSTAT_INC(igps_rcv_tooshort); 1489 m_freem(m); 1490 return (IPPROTO_DONE); 1491 } 1492 1493 /* 1494 * Always pullup to the minimum size for v1/v2 or v3 1495 * to amortize calls to m_pullup(). 1496 */ 1497 minlen = iphlen; 1498 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1499 minlen += IGMP_V3_QUERY_MINLEN; 1500 else 1501 minlen += IGMP_MINLEN; 1502 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1503 (m = m_pullup(m, minlen)) == NULL) { 1504 IGMPSTAT_INC(igps_rcv_tooshort); 1505 return (IPPROTO_DONE); 1506 } 1507 ip = mtod(m, struct ip *); 1508 1509 /* 1510 * Validate checksum. 1511 */ 1512 m->m_data += iphlen; 1513 m->m_len -= iphlen; 1514 igmp = mtod(m, struct igmp *); 1515 if (in_cksum(m, igmplen)) { 1516 IGMPSTAT_INC(igps_rcv_badsum); 1517 m_freem(m); 1518 return (IPPROTO_DONE); 1519 } 1520 m->m_data -= iphlen; 1521 m->m_len += iphlen; 1522 1523 /* 1524 * IGMP control traffic is link-scope, and must have a TTL of 1. 1525 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1526 * probe packets may come from beyond the LAN. 1527 */ 1528 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1529 IGMPSTAT_INC(igps_rcv_badttl); 1530 m_freem(m); 1531 return (IPPROTO_DONE); 1532 } 1533 1534 switch (igmp->igmp_type) { 1535 case IGMP_HOST_MEMBERSHIP_QUERY: 1536 if (igmplen == IGMP_MINLEN) { 1537 if (igmp->igmp_code == 0) 1538 queryver = IGMP_VERSION_1; 1539 else 1540 queryver = IGMP_VERSION_2; 1541 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1542 queryver = IGMP_VERSION_3; 1543 } else { 1544 IGMPSTAT_INC(igps_rcv_tooshort); 1545 m_freem(m); 1546 return (IPPROTO_DONE); 1547 } 1548 1549 switch (queryver) { 1550 case IGMP_VERSION_1: 1551 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1552 if (!V_igmp_v1enable) 1553 break; 1554 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1555 m_freem(m); 1556 return (IPPROTO_DONE); 1557 } 1558 break; 1559 1560 case IGMP_VERSION_2: 1561 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1562 if (!V_igmp_v2enable) 1563 break; 1564 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1565 m_freem(m); 1566 return (IPPROTO_DONE); 1567 } 1568 break; 1569 1570 case IGMP_VERSION_3: { 1571 struct igmpv3 *igmpv3; 1572 uint16_t igmpv3len; 1573 uint16_t nsrc; 1574 1575 IGMPSTAT_INC(igps_rcv_v3_queries); 1576 igmpv3 = (struct igmpv3 *)igmp; 1577 /* 1578 * Validate length based on source count. 1579 */ 1580 nsrc = ntohs(igmpv3->igmp_numsrc); 1581 if (nsrc * sizeof(in_addr_t) > 1582 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1583 IGMPSTAT_INC(igps_rcv_tooshort); 1584 m_freem(m); 1585 return (IPPROTO_DONE); 1586 } 1587 /* 1588 * m_pullup() may modify m, so pullup in 1589 * this scope. 1590 */ 1591 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1592 sizeof(struct in_addr) * nsrc; 1593 if ((!M_WRITABLE(m) || 1594 m->m_len < igmpv3len) && 1595 (m = m_pullup(m, igmpv3len)) == NULL) { 1596 IGMPSTAT_INC(igps_rcv_tooshort); 1597 return (IPPROTO_DONE); 1598 } 1599 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1600 + iphlen); 1601 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1602 m_freem(m); 1603 return (IPPROTO_DONE); 1604 } 1605 } 1606 break; 1607 } 1608 break; 1609 1610 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1611 if (!V_igmp_v1enable) 1612 break; 1613 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1614 m_freem(m); 1615 return (IPPROTO_DONE); 1616 } 1617 break; 1618 1619 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1620 if (!V_igmp_v2enable) 1621 break; 1622 if (!ip_checkrouteralert(m)) 1623 IGMPSTAT_INC(igps_rcv_nora); 1624 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1625 m_freem(m); 1626 return (IPPROTO_DONE); 1627 } 1628 break; 1629 1630 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1631 /* 1632 * Hosts do not need to process IGMPv3 membership reports, 1633 * as report suppression is no longer required. 1634 */ 1635 if (!ip_checkrouteralert(m)) 1636 IGMPSTAT_INC(igps_rcv_nora); 1637 break; 1638 1639 default: 1640 break; 1641 } 1642 1643 /* 1644 * Pass all valid IGMP packets up to any process(es) listening on a 1645 * raw IGMP socket. 1646 */ 1647 *mp = m; 1648 return (rip_input(mp, offp, proto)); 1649 } 1650 1651 /* 1652 * Fast timeout handler (global). 1653 * VIMAGE: Timeout handlers are expected to service all vimages. 1654 */ 1655 static struct callout igmpfast_callout; 1656 static void 1657 igmp_fasttimo(void *arg __unused) 1658 { 1659 struct epoch_tracker et; 1660 VNET_ITERATOR_DECL(vnet_iter); 1661 1662 NET_EPOCH_ENTER(et); 1663 VNET_LIST_RLOCK_NOSLEEP(); 1664 VNET_FOREACH(vnet_iter) { 1665 CURVNET_SET(vnet_iter); 1666 igmp_fasttimo_vnet(); 1667 CURVNET_RESTORE(); 1668 } 1669 VNET_LIST_RUNLOCK_NOSLEEP(); 1670 NET_EPOCH_EXIT(et); 1671 1672 callout_reset(&igmpfast_callout, hz / IGMP_FASTHZ, igmp_fasttimo, NULL); 1673 } 1674 1675 /* 1676 * Fast timeout handler (per-vnet). 1677 * Sends are shuffled off to a netisr to deal with Giant. 1678 * 1679 * VIMAGE: Assume caller has set up our curvnet. 1680 */ 1681 static void 1682 igmp_fasttimo_vnet(void) 1683 { 1684 struct mbufq scq; /* State-change packets */ 1685 struct mbufq qrq; /* Query response packets */ 1686 struct ifnet *ifp; 1687 struct igmp_ifsoftc *igi; 1688 struct ifmultiaddr *ifma; 1689 struct in_multi *inm; 1690 struct in_multi_head inm_free_tmp; 1691 int loop, uri_fasthz; 1692 1693 loop = 0; 1694 uri_fasthz = 0; 1695 1696 /* 1697 * Quick check to see if any work needs to be done, in order to 1698 * minimize the overhead of fasttimo processing. 1699 * SMPng: XXX Unlocked reads. 1700 */ 1701 if (!V_current_state_timers_running && 1702 !V_interface_timers_running && 1703 !V_state_change_timers_running) 1704 return; 1705 1706 SLIST_INIT(&inm_free_tmp); 1707 IN_MULTI_LIST_LOCK(); 1708 IGMP_LOCK(); 1709 1710 /* 1711 * IGMPv3 General Query response timer processing. 1712 */ 1713 if (V_interface_timers_running) { 1714 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1715 1716 V_interface_timers_running = 0; 1717 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1718 if (igi->igi_v3_timer == 0) { 1719 /* Do nothing. */ 1720 } else if (--igi->igi_v3_timer == 0) { 1721 igmp_v3_dispatch_general_query(igi); 1722 } else { 1723 V_interface_timers_running = 1; 1724 } 1725 } 1726 } 1727 1728 if (!V_current_state_timers_running && 1729 !V_state_change_timers_running) 1730 goto out_locked; 1731 1732 V_current_state_timers_running = 0; 1733 V_state_change_timers_running = 0; 1734 1735 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1736 1737 /* 1738 * IGMPv1/v2/v3 host report and state-change timer processing. 1739 * Note: Processing a v3 group timer may remove a node. 1740 */ 1741 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1742 ifp = igi->igi_ifp; 1743 1744 if (igi->igi_version == IGMP_VERSION_3) { 1745 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1746 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1747 IGMP_FASTHZ); 1748 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1749 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1750 } 1751 1752 IF_ADDR_WLOCK(ifp); 1753 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1754 inm = inm_ifmultiaddr_get_inm(ifma); 1755 if (inm == NULL) 1756 continue; 1757 switch (igi->igi_version) { 1758 case IGMP_VERSION_1: 1759 case IGMP_VERSION_2: 1760 igmp_v1v2_process_group_timer(inm, 1761 igi->igi_version); 1762 break; 1763 case IGMP_VERSION_3: 1764 igmp_v3_process_group_timers(&inm_free_tmp, &qrq, 1765 &scq, inm, uri_fasthz); 1766 break; 1767 } 1768 } 1769 IF_ADDR_WUNLOCK(ifp); 1770 1771 if (igi->igi_version == IGMP_VERSION_3) { 1772 igmp_dispatch_queue(&qrq, 0, loop); 1773 igmp_dispatch_queue(&scq, 0, loop); 1774 1775 /* 1776 * Free the in_multi reference(s) for this 1777 * IGMP lifecycle. 1778 */ 1779 inm_release_list_deferred(&inm_free_tmp); 1780 } 1781 } 1782 1783 out_locked: 1784 IGMP_UNLOCK(); 1785 IN_MULTI_LIST_UNLOCK(); 1786 } 1787 1788 /* 1789 * Update host report group timer for IGMPv1/v2. 1790 * Will update the global pending timer flags. 1791 */ 1792 static void 1793 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1794 { 1795 int report_timer_expired; 1796 1797 IN_MULTI_LIST_LOCK_ASSERT(); 1798 IGMP_LOCK_ASSERT(); 1799 1800 if (inm->inm_timer == 0) { 1801 report_timer_expired = 0; 1802 } else if (--inm->inm_timer == 0) { 1803 report_timer_expired = 1; 1804 } else { 1805 V_current_state_timers_running = 1; 1806 return; 1807 } 1808 1809 switch (inm->inm_state) { 1810 case IGMP_NOT_MEMBER: 1811 case IGMP_SILENT_MEMBER: 1812 case IGMP_IDLE_MEMBER: 1813 case IGMP_LAZY_MEMBER: 1814 case IGMP_SLEEPING_MEMBER: 1815 case IGMP_AWAKENING_MEMBER: 1816 break; 1817 case IGMP_REPORTING_MEMBER: 1818 if (report_timer_expired) { 1819 inm->inm_state = IGMP_IDLE_MEMBER; 1820 (void)igmp_v1v2_queue_report(inm, 1821 (version == IGMP_VERSION_2) ? 1822 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1823 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1824 } 1825 break; 1826 case IGMP_G_QUERY_PENDING_MEMBER: 1827 case IGMP_SG_QUERY_PENDING_MEMBER: 1828 case IGMP_LEAVING_MEMBER: 1829 break; 1830 } 1831 } 1832 1833 /* 1834 * Update a group's timers for IGMPv3. 1835 * Will update the global pending timer flags. 1836 * Note: Unlocked read from igi. 1837 */ 1838 static void 1839 igmp_v3_process_group_timers(struct in_multi_head *inmh, 1840 struct mbufq *qrq, struct mbufq *scq, 1841 struct in_multi *inm, const int uri_fasthz) 1842 { 1843 int query_response_timer_expired; 1844 int state_change_retransmit_timer_expired; 1845 1846 IN_MULTI_LIST_LOCK_ASSERT(); 1847 IGMP_LOCK_ASSERT(); 1848 1849 query_response_timer_expired = 0; 1850 state_change_retransmit_timer_expired = 0; 1851 1852 /* 1853 * During a transition from v1/v2 compatibility mode back to v3, 1854 * a group record in REPORTING state may still have its group 1855 * timer active. This is a no-op in this function; it is easier 1856 * to deal with it here than to complicate the slow-timeout path. 1857 */ 1858 if (inm->inm_timer == 0) { 1859 query_response_timer_expired = 0; 1860 } else if (--inm->inm_timer == 0) { 1861 query_response_timer_expired = 1; 1862 } else { 1863 V_current_state_timers_running = 1; 1864 } 1865 1866 if (inm->inm_sctimer == 0) { 1867 state_change_retransmit_timer_expired = 0; 1868 } else if (--inm->inm_sctimer == 0) { 1869 state_change_retransmit_timer_expired = 1; 1870 } else { 1871 V_state_change_timers_running = 1; 1872 } 1873 1874 /* We are in fasttimo, so be quick about it. */ 1875 if (!state_change_retransmit_timer_expired && 1876 !query_response_timer_expired) 1877 return; 1878 1879 switch (inm->inm_state) { 1880 case IGMP_NOT_MEMBER: 1881 case IGMP_SILENT_MEMBER: 1882 case IGMP_SLEEPING_MEMBER: 1883 case IGMP_LAZY_MEMBER: 1884 case IGMP_AWAKENING_MEMBER: 1885 case IGMP_IDLE_MEMBER: 1886 break; 1887 case IGMP_G_QUERY_PENDING_MEMBER: 1888 case IGMP_SG_QUERY_PENDING_MEMBER: 1889 /* 1890 * Respond to a previously pending Group-Specific 1891 * or Group-and-Source-Specific query by enqueueing 1892 * the appropriate Current-State report for 1893 * immediate transmission. 1894 */ 1895 if (query_response_timer_expired) { 1896 int retval __unused; 1897 1898 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1899 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1900 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1901 __func__, retval); 1902 inm->inm_state = IGMP_REPORTING_MEMBER; 1903 /* XXX Clear recorded sources for next time. */ 1904 inm_clear_recorded(inm); 1905 } 1906 /* FALLTHROUGH */ 1907 case IGMP_REPORTING_MEMBER: 1908 case IGMP_LEAVING_MEMBER: 1909 if (state_change_retransmit_timer_expired) { 1910 /* 1911 * State-change retransmission timer fired. 1912 * If there are any further pending retransmissions, 1913 * set the global pending state-change flag, and 1914 * reset the timer. 1915 */ 1916 if (--inm->inm_scrv > 0) { 1917 inm->inm_sctimer = uri_fasthz; 1918 V_state_change_timers_running = 1; 1919 } 1920 /* 1921 * Retransmit the previously computed state-change 1922 * report. If there are no further pending 1923 * retransmissions, the mbuf queue will be consumed. 1924 * Update T0 state to T1 as we have now sent 1925 * a state-change. 1926 */ 1927 (void)igmp_v3_merge_state_changes(inm, scq); 1928 1929 inm_commit(inm); 1930 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1931 ntohl(inm->inm_addr.s_addr), 1932 inm->inm_ifp->if_xname); 1933 1934 /* 1935 * If we are leaving the group for good, make sure 1936 * we release IGMP's reference to it. 1937 * This release must be deferred using a SLIST, 1938 * as we are called from a loop which traverses 1939 * the in_ifmultiaddr TAILQ. 1940 */ 1941 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1942 inm->inm_scrv == 0) { 1943 inm->inm_state = IGMP_NOT_MEMBER; 1944 inm_rele_locked(inmh, inm); 1945 } 1946 } 1947 break; 1948 } 1949 } 1950 1951 /* 1952 * Suppress a group's pending response to a group or source/group query. 1953 * 1954 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1955 * Do NOT update ST1/ST0 as this operation merely suppresses 1956 * the currently pending group record. 1957 * Do NOT suppress the response to a general query. It is possible but 1958 * it would require adding another state or flag. 1959 */ 1960 static void 1961 igmp_v3_suppress_group_record(struct in_multi *inm) 1962 { 1963 1964 IN_MULTI_LIST_LOCK_ASSERT(); 1965 1966 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1967 ("%s: not IGMPv3 mode on link", __func__)); 1968 1969 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1970 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1971 return; 1972 1973 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1974 inm_clear_recorded(inm); 1975 1976 inm->inm_timer = 0; 1977 inm->inm_state = IGMP_REPORTING_MEMBER; 1978 } 1979 1980 /* 1981 * Switch to a different IGMP version on the given interface, 1982 * as per Section 7.2.1. 1983 */ 1984 static void 1985 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1986 { 1987 int old_version_timer; 1988 1989 IGMP_LOCK_ASSERT(); 1990 1991 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 1992 version, igi->igi_ifp, igi->igi_ifp->if_xname); 1993 1994 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 1995 /* 1996 * Compute the "Older Version Querier Present" timer as per 1997 * Section 8.12. 1998 */ 1999 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 2000 old_version_timer *= IGMP_SLOWHZ; 2001 2002 if (version == IGMP_VERSION_1) { 2003 igi->igi_v1_timer = old_version_timer; 2004 igi->igi_v2_timer = 0; 2005 } else if (version == IGMP_VERSION_2) { 2006 igi->igi_v1_timer = 0; 2007 igi->igi_v2_timer = old_version_timer; 2008 } 2009 } 2010 2011 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2012 if (igi->igi_version != IGMP_VERSION_2) { 2013 igi->igi_version = IGMP_VERSION_2; 2014 igmp_v3_cancel_link_timers(igi); 2015 } 2016 } else if (igi->igi_v1_timer > 0) { 2017 if (igi->igi_version != IGMP_VERSION_1) { 2018 igi->igi_version = IGMP_VERSION_1; 2019 igmp_v3_cancel_link_timers(igi); 2020 } 2021 } 2022 } 2023 2024 /* 2025 * Cancel pending IGMPv3 timers for the given link and all groups 2026 * joined on it; state-change, general-query, and group-query timers. 2027 * 2028 * Only ever called on a transition from v3 to Compatibility mode. Kill 2029 * the timers stone dead (this may be expensive for large N groups), they 2030 * will be restarted if Compatibility Mode deems that they must be due to 2031 * query processing. 2032 */ 2033 static void 2034 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2035 { 2036 struct ifmultiaddr *ifma; 2037 struct ifnet *ifp; 2038 struct in_multi *inm; 2039 struct in_multi_head inm_free_tmp; 2040 2041 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2042 igi->igi_ifp, igi->igi_ifp->if_xname); 2043 2044 IN_MULTI_LIST_LOCK_ASSERT(); 2045 IGMP_LOCK_ASSERT(); 2046 NET_EPOCH_ASSERT(); 2047 2048 SLIST_INIT(&inm_free_tmp); 2049 2050 /* 2051 * Stop the v3 General Query Response on this link stone dead. 2052 * If fasttimo is woken up due to V_interface_timers_running, 2053 * the flag will be cleared if there are no pending link timers. 2054 */ 2055 igi->igi_v3_timer = 0; 2056 2057 /* 2058 * Now clear the current-state and state-change report timers 2059 * for all memberships scoped to this link. 2060 */ 2061 ifp = igi->igi_ifp; 2062 IF_ADDR_WLOCK(ifp); 2063 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2064 inm = inm_ifmultiaddr_get_inm(ifma); 2065 if (inm == NULL) 2066 continue; 2067 switch (inm->inm_state) { 2068 case IGMP_NOT_MEMBER: 2069 case IGMP_SILENT_MEMBER: 2070 case IGMP_IDLE_MEMBER: 2071 case IGMP_LAZY_MEMBER: 2072 case IGMP_SLEEPING_MEMBER: 2073 case IGMP_AWAKENING_MEMBER: 2074 /* 2075 * These states are either not relevant in v3 mode, 2076 * or are unreported. Do nothing. 2077 */ 2078 break; 2079 case IGMP_LEAVING_MEMBER: 2080 /* 2081 * If we are leaving the group and switching to 2082 * compatibility mode, we need to release the final 2083 * reference held for issuing the INCLUDE {}, and 2084 * transition to REPORTING to ensure the host leave 2085 * message is sent upstream to the old querier -- 2086 * transition to NOT would lose the leave and race. 2087 */ 2088 inm_rele_locked(&inm_free_tmp, inm); 2089 /* FALLTHROUGH */ 2090 case IGMP_G_QUERY_PENDING_MEMBER: 2091 case IGMP_SG_QUERY_PENDING_MEMBER: 2092 inm_clear_recorded(inm); 2093 /* FALLTHROUGH */ 2094 case IGMP_REPORTING_MEMBER: 2095 inm->inm_state = IGMP_REPORTING_MEMBER; 2096 break; 2097 } 2098 /* 2099 * Always clear state-change and group report timers. 2100 * Free any pending IGMPv3 state-change records. 2101 */ 2102 inm->inm_sctimer = 0; 2103 inm->inm_timer = 0; 2104 mbufq_drain(&inm->inm_scq); 2105 } 2106 IF_ADDR_WUNLOCK(ifp); 2107 2108 inm_release_list_deferred(&inm_free_tmp); 2109 } 2110 2111 /* 2112 * Update the Older Version Querier Present timers for a link. 2113 * See Section 7.2.1 of RFC 3376. 2114 */ 2115 static void 2116 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2117 { 2118 2119 IGMP_LOCK_ASSERT(); 2120 2121 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2122 /* 2123 * IGMPv1 and IGMPv2 Querier Present timers expired. 2124 * 2125 * Revert to IGMPv3. 2126 */ 2127 if (V_igmp_default_version == IGMP_VERSION_3 && 2128 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_default_version == IGMP_VERSION_3 && 2144 !V_igmp_v2enable) { 2145 CTR5(KTR_IGMPV3, 2146 "%s: transition from v%d -> v%d on %p(%s)", 2147 __func__, igi->igi_version, IGMP_VERSION_3, 2148 igi->igi_ifp, igi->igi_ifp->if_xname); 2149 igi->igi_v2_timer = 0; 2150 igi->igi_version = IGMP_VERSION_3; 2151 } else { 2152 --igi->igi_v2_timer; 2153 if (V_igmp_default_version == IGMP_VERSION_2 && 2154 igi->igi_version != IGMP_VERSION_2) { 2155 CTR5(KTR_IGMPV3, 2156 "%s: transition from v%d -> v%d on %p(%s)", 2157 __func__, igi->igi_version, IGMP_VERSION_2, 2158 igi->igi_ifp, igi->igi_ifp->if_xname); 2159 igi->igi_version = IGMP_VERSION_2; 2160 igmp_v3_cancel_link_timers(igi); 2161 } 2162 } 2163 } else if (igi->igi_v1_timer > 0) { 2164 /* 2165 * IGMPv1 Querier Present timer running. 2166 * Stop IGMPv2 timer if running. 2167 * 2168 * If IGMPv1 was disabled since last timeout, 2169 * revert to IGMPv3. 2170 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2171 */ 2172 if (V_igmp_default_version == IGMP_VERSION_3 && 2173 !V_igmp_v1enable) { 2174 CTR5(KTR_IGMPV3, 2175 "%s: transition from v%d -> v%d on %p(%s)", 2176 __func__, igi->igi_version, IGMP_VERSION_3, 2177 igi->igi_ifp, igi->igi_ifp->if_xname); 2178 igi->igi_v1_timer = 0; 2179 igi->igi_version = IGMP_VERSION_3; 2180 } else { 2181 --igi->igi_v1_timer; 2182 } 2183 if (igi->igi_v2_timer > 0) { 2184 CTR3(KTR_IGMPV3, 2185 "%s: cancel v2 timer on %p(%s)", 2186 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2187 igi->igi_v2_timer = 0; 2188 } 2189 } 2190 } 2191 2192 /* 2193 * Global slowtimo handler. 2194 * VIMAGE: Timeout handlers are expected to service all vimages. 2195 */ 2196 static struct callout igmpslow_callout; 2197 static void 2198 igmp_slowtimo(void *arg __unused) 2199 { 2200 struct epoch_tracker et; 2201 VNET_ITERATOR_DECL(vnet_iter); 2202 2203 NET_EPOCH_ENTER(et); 2204 VNET_LIST_RLOCK_NOSLEEP(); 2205 VNET_FOREACH(vnet_iter) { 2206 CURVNET_SET(vnet_iter); 2207 igmp_slowtimo_vnet(); 2208 CURVNET_RESTORE(); 2209 } 2210 VNET_LIST_RUNLOCK_NOSLEEP(); 2211 NET_EPOCH_EXIT(et); 2212 2213 callout_reset(&igmpslow_callout, hz / IGMP_SLOWHZ, igmp_slowtimo, NULL); 2214 } 2215 2216 /* 2217 * Per-vnet slowtimo handler. 2218 */ 2219 static void 2220 igmp_slowtimo_vnet(void) 2221 { 2222 struct igmp_ifsoftc *igi; 2223 2224 IGMP_LOCK(); 2225 2226 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2227 igmp_v1v2_process_querier_timers(igi); 2228 } 2229 2230 IGMP_UNLOCK(); 2231 } 2232 2233 /* 2234 * Dispatch an IGMPv1/v2 host report or leave message. 2235 * These are always small enough to fit inside a single mbuf. 2236 */ 2237 static int 2238 igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2239 { 2240 struct epoch_tracker et; 2241 struct ifnet *ifp; 2242 struct igmp *igmp; 2243 struct ip *ip; 2244 struct mbuf *m; 2245 2246 IN_MULTI_LIST_LOCK_ASSERT(); 2247 IGMP_LOCK_ASSERT(); 2248 2249 ifp = inm->inm_ifp; 2250 2251 m = m_gethdr(M_NOWAIT, MT_DATA); 2252 if (m == NULL) 2253 return (ENOMEM); 2254 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2255 2256 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2257 2258 m->m_data += sizeof(struct ip); 2259 m->m_len = sizeof(struct igmp); 2260 2261 igmp = mtod(m, struct igmp *); 2262 igmp->igmp_type = type; 2263 igmp->igmp_code = 0; 2264 igmp->igmp_group = inm->inm_addr; 2265 igmp->igmp_cksum = 0; 2266 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2267 2268 m->m_data -= sizeof(struct ip); 2269 m->m_len += sizeof(struct ip); 2270 2271 ip = mtod(m, struct ip *); 2272 ip->ip_tos = 0; 2273 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2274 ip->ip_off = 0; 2275 ip->ip_p = IPPROTO_IGMP; 2276 ip->ip_src.s_addr = INADDR_ANY; 2277 2278 if (type == IGMP_HOST_LEAVE_MESSAGE) 2279 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2280 else 2281 ip->ip_dst = inm->inm_addr; 2282 2283 igmp_save_context(m, ifp); 2284 2285 m->m_flags |= M_IGMPV2; 2286 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2287 m->m_flags |= M_IGMP_LOOP; 2288 2289 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2290 NET_EPOCH_ENTER(et); 2291 netisr_dispatch(NETISR_IGMP, m); 2292 NET_EPOCH_EXIT(et); 2293 2294 return (0); 2295 } 2296 2297 /* 2298 * Process a state change from the upper layer for the given IPv4 group. 2299 * 2300 * Each socket holds a reference on the in_multi in its own ip_moptions. 2301 * The socket layer will have made the necessary updates to.the group 2302 * state, it is now up to IGMP to issue a state change report if there 2303 * has been any change between T0 (when the last state-change was issued) 2304 * and T1 (now). 2305 * 2306 * We use the IGMPv3 state machine at group level. The IGMP module 2307 * however makes the decision as to which IGMP protocol version to speak. 2308 * A state change *from* INCLUDE {} always means an initial join. 2309 * A state change *to* INCLUDE {} always means a final leave. 2310 * 2311 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2312 * save ourselves a bunch of work; any exclusive mode groups need not 2313 * compute source filter lists. 2314 * 2315 * VIMAGE: curvnet should have been set by caller, as this routine 2316 * is called from the socket option handlers. 2317 */ 2318 int 2319 igmp_change_state(struct in_multi *inm) 2320 { 2321 struct igmp_ifsoftc *igi; 2322 struct ifnet *ifp; 2323 int error; 2324 2325 error = 0; 2326 IN_MULTI_LOCK_ASSERT(); 2327 /* 2328 * Try to detect if the upper layer just asked us to change state 2329 * for an interface which has now gone away. 2330 */ 2331 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2332 ifp = inm->inm_ifma->ifma_ifp; 2333 if (ifp == NULL) 2334 return (0); 2335 /* 2336 * Sanity check that netinet's notion of ifp is the 2337 * same as net's. 2338 */ 2339 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2340 2341 IGMP_LOCK(); 2342 2343 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2344 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2345 2346 /* 2347 * If we detect a state transition to or from MCAST_UNDEFINED 2348 * for this group, then we are starting or finishing an IGMP 2349 * life cycle for this group. 2350 */ 2351 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2352 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2353 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2354 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2355 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2356 error = igmp_initial_join(inm, igi); 2357 goto out_locked; 2358 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2359 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2360 igmp_final_leave(inm, igi); 2361 goto out_locked; 2362 } 2363 } else { 2364 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2365 } 2366 2367 error = igmp_handle_state_change(inm, igi); 2368 2369 out_locked: 2370 IGMP_UNLOCK(); 2371 return (error); 2372 } 2373 2374 /* 2375 * Perform the initial join for an IGMP group. 2376 * 2377 * When joining a group: 2378 * If the group should have its IGMP traffic suppressed, do nothing. 2379 * IGMPv1 starts sending IGMPv1 host membership reports. 2380 * IGMPv2 starts sending IGMPv2 host membership reports. 2381 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2382 * initial state of the membership. 2383 */ 2384 static int 2385 igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2386 { 2387 struct ifnet *ifp; 2388 struct mbufq *mq; 2389 int error, retval, syncstates; 2390 2391 CTR4(KTR_IGMPV3, "%s: initial join 0x%08x on ifp %p(%s)", __func__, 2392 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2393 2394 error = 0; 2395 syncstates = 1; 2396 2397 ifp = inm->inm_ifp; 2398 2399 IN_MULTI_LOCK_ASSERT(); 2400 IGMP_LOCK_ASSERT(); 2401 2402 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2403 2404 /* 2405 * Groups joined on loopback or marked as 'not reported', 2406 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2407 * are never reported in any IGMP protocol exchanges. 2408 * All other groups enter the appropriate IGMP state machine 2409 * for the version in use on this link. 2410 * A link marked as IGIF_SILENT causes IGMP to be completely 2411 * disabled for the link. 2412 */ 2413 if ((ifp->if_flags & IFF_LOOPBACK) || 2414 (igi->igi_flags & IGIF_SILENT) || 2415 !igmp_isgroupreported(inm->inm_addr)) { 2416 CTR1(KTR_IGMPV3, 2417 "%s: not kicking state machine for silent group", __func__); 2418 inm->inm_state = IGMP_SILENT_MEMBER; 2419 inm->inm_timer = 0; 2420 } else { 2421 /* 2422 * Deal with overlapping in_multi lifecycle. 2423 * If this group was LEAVING, then make sure 2424 * we drop the reference we picked up to keep the 2425 * group around for the final INCLUDE {} enqueue. 2426 */ 2427 if (igi->igi_version == IGMP_VERSION_3 && 2428 inm->inm_state == IGMP_LEAVING_MEMBER) { 2429 MPASS(inm->inm_refcount > 1); 2430 inm_rele_locked(NULL, inm); 2431 } 2432 inm->inm_state = IGMP_REPORTING_MEMBER; 2433 2434 switch (igi->igi_version) { 2435 case IGMP_VERSION_1: 2436 case IGMP_VERSION_2: 2437 inm->inm_state = IGMP_IDLE_MEMBER; 2438 error = igmp_v1v2_queue_report(inm, 2439 (igi->igi_version == IGMP_VERSION_2) ? 2440 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2441 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2442 if (error == 0) { 2443 inm->inm_timer = IGMP_RANDOM_DELAY( 2444 IGMP_V1V2_MAX_RI * IGMP_FASTHZ); 2445 V_current_state_timers_running = 1; 2446 } 2447 break; 2448 2449 case IGMP_VERSION_3: 2450 /* 2451 * Defer update of T0 to T1, until the first copy 2452 * of the state change has been transmitted. 2453 */ 2454 syncstates = 0; 2455 2456 /* 2457 * Immediately enqueue a State-Change Report for 2458 * this interface, freeing any previous reports. 2459 * Don't kick the timers if there is nothing to do, 2460 * or if an error occurred. 2461 */ 2462 mq = &inm->inm_scq; 2463 mbufq_drain(mq); 2464 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2465 0, 0); 2466 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2467 __func__, retval); 2468 if (retval <= 0) { 2469 error = retval * -1; 2470 break; 2471 } 2472 2473 /* 2474 * Schedule transmission of pending state-change 2475 * report up to RV times for this link. The timer 2476 * will fire at the next igmp_fasttimo (~200ms), 2477 * giving us an opportunity to merge the reports. 2478 */ 2479 if (igi->igi_flags & IGIF_LOOPBACK) { 2480 inm->inm_scrv = 1; 2481 } else { 2482 KASSERT(igi->igi_rv > 1, 2483 ("%s: invalid robustness %d", __func__, 2484 igi->igi_rv)); 2485 inm->inm_scrv = igi->igi_rv; 2486 } 2487 inm->inm_sctimer = 1; 2488 V_state_change_timers_running = 1; 2489 2490 error = 0; 2491 break; 2492 } 2493 } 2494 2495 /* 2496 * Only update the T0 state if state change is atomic, 2497 * i.e. we don't need to wait for a timer to fire before we 2498 * can consider the state change to have been communicated. 2499 */ 2500 if (syncstates) { 2501 inm_commit(inm); 2502 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2503 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2504 } 2505 2506 return (error); 2507 } 2508 2509 /* 2510 * Issue an intermediate state change during the IGMP life-cycle. 2511 */ 2512 static int 2513 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2514 { 2515 struct ifnet *ifp; 2516 int retval; 2517 2518 CTR4(KTR_IGMPV3, "%s: state change for 0x%08x on ifp %p(%s)", __func__, 2519 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2520 2521 ifp = inm->inm_ifp; 2522 2523 IN_MULTI_LIST_LOCK_ASSERT(); 2524 IGMP_LOCK_ASSERT(); 2525 2526 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2527 2528 if ((ifp->if_flags & IFF_LOOPBACK) || 2529 (igi->igi_flags & IGIF_SILENT) || 2530 !igmp_isgroupreported(inm->inm_addr) || 2531 (igi->igi_version != IGMP_VERSION_3)) { 2532 if (!igmp_isgroupreported(inm->inm_addr)) { 2533 CTR1(KTR_IGMPV3, 2534 "%s: not kicking state machine for silent group", __func__); 2535 } 2536 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2537 inm_commit(inm); 2538 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2539 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2540 return (0); 2541 } 2542 2543 mbufq_drain(&inm->inm_scq); 2544 2545 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2546 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2547 if (retval <= 0) 2548 return (-retval); 2549 2550 /* 2551 * If record(s) were enqueued, start the state-change 2552 * report timer for this group. 2553 */ 2554 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2555 inm->inm_sctimer = 1; 2556 V_state_change_timers_running = 1; 2557 2558 return (0); 2559 } 2560 2561 /* 2562 * Perform the final leave for an IGMP group. 2563 * 2564 * When leaving a group: 2565 * IGMPv1 does nothing. 2566 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2567 * IGMPv3 enqueues a state-change report containing a transition 2568 * to INCLUDE {} for immediate transmission. 2569 */ 2570 static void 2571 igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2572 { 2573 int syncstates; 2574 2575 syncstates = 1; 2576 2577 CTR4(KTR_IGMPV3, "%s: final leave 0x%08x on ifp %p(%s)", 2578 __func__, ntohl(inm->inm_addr.s_addr), inm->inm_ifp, 2579 inm->inm_ifp->if_xname); 2580 2581 IN_MULTI_LIST_LOCK_ASSERT(); 2582 IGMP_LOCK_ASSERT(); 2583 2584 switch (inm->inm_state) { 2585 case IGMP_NOT_MEMBER: 2586 case IGMP_SILENT_MEMBER: 2587 case IGMP_LEAVING_MEMBER: 2588 /* Already leaving or left; do nothing. */ 2589 CTR1(KTR_IGMPV3, 2590 "%s: not kicking state machine for silent group", __func__); 2591 break; 2592 case IGMP_REPORTING_MEMBER: 2593 case IGMP_IDLE_MEMBER: 2594 case IGMP_G_QUERY_PENDING_MEMBER: 2595 case IGMP_SG_QUERY_PENDING_MEMBER: 2596 if (igi->igi_version == IGMP_VERSION_2) { 2597 #ifdef INVARIANTS 2598 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2599 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2600 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2601 __func__); 2602 #endif 2603 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2604 inm->inm_state = IGMP_NOT_MEMBER; 2605 } else if (igi->igi_version == IGMP_VERSION_3) { 2606 /* 2607 * Stop group timer and all pending reports. 2608 * Immediately enqueue a state-change report 2609 * TO_IN {} to be sent on the next fast timeout, 2610 * giving us an opportunity to merge reports. 2611 */ 2612 mbufq_drain(&inm->inm_scq); 2613 inm->inm_timer = 0; 2614 if (igi->igi_flags & IGIF_LOOPBACK) { 2615 inm->inm_scrv = 1; 2616 } else { 2617 inm->inm_scrv = igi->igi_rv; 2618 } 2619 CTR4(KTR_IGMPV3, "%s: Leaving 0x%08x/%s with %d " 2620 "pending retransmissions.", __func__, 2621 ntohl(inm->inm_addr.s_addr), 2622 inm->inm_ifp->if_xname, inm->inm_scrv); 2623 if (inm->inm_scrv == 0) { 2624 inm->inm_state = IGMP_NOT_MEMBER; 2625 inm->inm_sctimer = 0; 2626 } else { 2627 int retval __unused; 2628 2629 inm_acquire_locked(inm); 2630 2631 retval = igmp_v3_enqueue_group_record( 2632 &inm->inm_scq, inm, 1, 0, 0); 2633 KASSERT(retval != 0, 2634 ("%s: enqueue record = %d", __func__, 2635 retval)); 2636 2637 inm->inm_state = IGMP_LEAVING_MEMBER; 2638 inm->inm_sctimer = 1; 2639 V_state_change_timers_running = 1; 2640 syncstates = 0; 2641 } 2642 break; 2643 } 2644 break; 2645 case IGMP_LAZY_MEMBER: 2646 case IGMP_SLEEPING_MEMBER: 2647 case IGMP_AWAKENING_MEMBER: 2648 /* Our reports are suppressed; do nothing. */ 2649 break; 2650 } 2651 2652 if (syncstates) { 2653 inm_commit(inm); 2654 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2655 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2656 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2657 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for 0x%08x/%s", 2658 __func__, ntohl(inm->inm_addr.s_addr), 2659 inm->inm_ifp->if_xname); 2660 } 2661 } 2662 2663 /* 2664 * Enqueue an IGMPv3 group record to the given output queue. 2665 * 2666 * XXX This function could do with having the allocation code 2667 * split out, and the multiple-tree-walks coalesced into a single 2668 * routine as has been done in igmp_v3_enqueue_filter_change(). 2669 * 2670 * If is_state_change is zero, a current-state record is appended. 2671 * If is_state_change is non-zero, a state-change report is appended. 2672 * 2673 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2674 * If is_group_query is zero, and if there is a packet with free space 2675 * at the tail of the queue, it will be appended to providing there 2676 * is enough free space. 2677 * Otherwise a new mbuf packet chain is allocated. 2678 * 2679 * If is_source_query is non-zero, each source is checked to see if 2680 * it was recorded for a Group-Source query, and will be omitted if 2681 * it is not both in-mode and recorded. 2682 * 2683 * The function will attempt to allocate leading space in the packet 2684 * for the IP/IGMP header to be prepended without fragmenting the chain. 2685 * 2686 * If successful the size of all data appended to the queue is returned, 2687 * otherwise an error code less than zero is returned, or zero if 2688 * no record(s) were appended. 2689 */ 2690 static int 2691 igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2692 const int is_state_change, const int is_group_query, 2693 const int is_source_query) 2694 { 2695 struct igmp_grouprec ig; 2696 struct igmp_grouprec *pig; 2697 struct ifnet *ifp; 2698 struct ip_msource *ims, *nims; 2699 struct mbuf *m0, *m, *md; 2700 int is_filter_list_change; 2701 int minrec0len, m0srcs, msrcs, nbytes, off; 2702 int record_has_sources; 2703 int now; 2704 int type; 2705 in_addr_t naddr; 2706 uint8_t mode; 2707 2708 IN_MULTI_LIST_LOCK_ASSERT(); 2709 2710 ifp = inm->inm_ifp; 2711 is_filter_list_change = 0; 2712 m = NULL; 2713 m0 = NULL; 2714 m0srcs = 0; 2715 msrcs = 0; 2716 nbytes = 0; 2717 nims = NULL; 2718 record_has_sources = 1; 2719 pig = NULL; 2720 type = IGMP_DO_NOTHING; 2721 mode = inm->inm_st[1].iss_fmode; 2722 2723 /* 2724 * If we did not transition out of ASM mode during t0->t1, 2725 * and there are no source nodes to process, we can skip 2726 * the generation of source records. 2727 */ 2728 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2729 inm->inm_nsrc == 0) 2730 record_has_sources = 0; 2731 2732 if (is_state_change) { 2733 /* 2734 * Queue a state change record. 2735 * If the mode did not change, and there are non-ASM 2736 * listeners or source filters present, 2737 * we potentially need to issue two records for the group. 2738 * If we are transitioning to MCAST_UNDEFINED, we need 2739 * not send any sources. 2740 * If there are ASM listeners, and there was no filter 2741 * mode transition of any kind, do nothing. 2742 */ 2743 if (mode != inm->inm_st[0].iss_fmode) { 2744 if (mode == MCAST_EXCLUDE) { 2745 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2746 __func__); 2747 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2748 } else { 2749 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2750 __func__); 2751 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2752 if (mode == MCAST_UNDEFINED) 2753 record_has_sources = 0; 2754 } 2755 } else { 2756 if (record_has_sources) { 2757 is_filter_list_change = 1; 2758 } else { 2759 type = IGMP_DO_NOTHING; 2760 } 2761 } 2762 } else { 2763 /* 2764 * Queue a current state record. 2765 */ 2766 if (mode == MCAST_EXCLUDE) { 2767 type = IGMP_MODE_IS_EXCLUDE; 2768 } else if (mode == MCAST_INCLUDE) { 2769 type = IGMP_MODE_IS_INCLUDE; 2770 KASSERT(inm->inm_st[1].iss_asm == 0, 2771 ("%s: inm %p is INCLUDE but ASM count is %d", 2772 __func__, inm, inm->inm_st[1].iss_asm)); 2773 } 2774 } 2775 2776 /* 2777 * Generate the filter list changes using a separate function. 2778 */ 2779 if (is_filter_list_change) 2780 return (igmp_v3_enqueue_filter_change(mq, inm)); 2781 2782 if (type == IGMP_DO_NOTHING) { 2783 CTR3(KTR_IGMPV3, "%s: nothing to do for 0x%08x/%s", __func__, 2784 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2785 return (0); 2786 } 2787 2788 /* 2789 * If any sources are present, we must be able to fit at least 2790 * one in the trailing space of the tail packet's mbuf, 2791 * ideally more. 2792 */ 2793 minrec0len = sizeof(struct igmp_grouprec); 2794 if (record_has_sources) 2795 minrec0len += sizeof(in_addr_t); 2796 2797 CTR4(KTR_IGMPV3, "%s: queueing %s for 0x%08x/%s", __func__, 2798 igmp_rec_type_to_str(type), ntohl(inm->inm_addr.s_addr), 2799 inm->inm_ifp->if_xname); 2800 2801 /* 2802 * Check if we have a packet in the tail of the queue for this 2803 * group into which the first group record for this group will fit. 2804 * Otherwise allocate a new packet. 2805 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2806 * Note: Group records for G/GSR query responses MUST be sent 2807 * in their own packet. 2808 */ 2809 m0 = mbufq_last(mq); 2810 if (!is_group_query && 2811 m0 != NULL && 2812 (m0->m_pkthdr.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2813 (m0->m_pkthdr.len + minrec0len) < 2814 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2815 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2816 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2817 m = m0; 2818 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2819 } else { 2820 if (mbufq_full(mq)) { 2821 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2822 return (-ENOMEM); 2823 } 2824 m = NULL; 2825 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2826 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2827 if (!is_state_change && !is_group_query) { 2828 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2829 if (m) 2830 m->m_data += IGMP_LEADINGSPACE; 2831 } 2832 if (m == NULL) { 2833 m = m_gethdr(M_NOWAIT, MT_DATA); 2834 if (m) 2835 M_ALIGN(m, IGMP_LEADINGSPACE); 2836 } 2837 if (m == NULL) 2838 return (-ENOMEM); 2839 2840 igmp_save_context(m, ifp); 2841 2842 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2843 } 2844 2845 /* 2846 * Append group record. 2847 * If we have sources, we don't know how many yet. 2848 */ 2849 ig.ig_type = type; 2850 ig.ig_datalen = 0; 2851 ig.ig_numsrc = 0; 2852 ig.ig_group = inm->inm_addr; 2853 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2854 if (m != m0) 2855 m_freem(m); 2856 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2857 return (-ENOMEM); 2858 } 2859 nbytes += sizeof(struct igmp_grouprec); 2860 2861 /* 2862 * Append as many sources as will fit in the first packet. 2863 * If we are appending to a new packet, the chain allocation 2864 * may potentially use clusters; use m_getptr() in this case. 2865 * If we are appending to an existing packet, we need to obtain 2866 * a pointer to the group record after m_append(), in case a new 2867 * mbuf was allocated. 2868 * Only append sources which are in-mode at t1. If we are 2869 * transitioning to MCAST_UNDEFINED state on the group, do not 2870 * include source entries. 2871 * Only report recorded sources in our filter set when responding 2872 * to a group-source query. 2873 */ 2874 if (record_has_sources) { 2875 if (m == m0) { 2876 md = m_last(m); 2877 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2878 md->m_len - nbytes); 2879 } else { 2880 md = m_getptr(m, 0, &off); 2881 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2882 off); 2883 } 2884 msrcs = 0; 2885 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2886 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2887 ims->ims_haddr); 2888 now = ims_get_mode(inm, ims, 1); 2889 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2890 if ((now != mode) || 2891 (now == mode && mode == MCAST_UNDEFINED)) { 2892 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2893 continue; 2894 } 2895 if (is_source_query && ims->ims_stp == 0) { 2896 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2897 __func__); 2898 continue; 2899 } 2900 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2901 naddr = htonl(ims->ims_haddr); 2902 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2903 if (m != m0) 2904 m_freem(m); 2905 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2906 __func__); 2907 return (-ENOMEM); 2908 } 2909 nbytes += sizeof(in_addr_t); 2910 ++msrcs; 2911 if (msrcs == m0srcs) 2912 break; 2913 } 2914 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2915 msrcs); 2916 pig->ig_numsrc = htons(msrcs); 2917 nbytes += (msrcs * sizeof(in_addr_t)); 2918 } 2919 2920 if (is_source_query && msrcs == 0) { 2921 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2922 if (m != m0) 2923 m_freem(m); 2924 return (0); 2925 } 2926 2927 /* 2928 * We are good to go with first packet. 2929 */ 2930 if (m != m0) { 2931 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2932 m->m_pkthdr.vt_nrecs = 1; 2933 mbufq_enqueue(mq, m); 2934 } else 2935 m->m_pkthdr.vt_nrecs++; 2936 2937 /* 2938 * No further work needed if no source list in packet(s). 2939 */ 2940 if (!record_has_sources) 2941 return (nbytes); 2942 2943 /* 2944 * Whilst sources remain to be announced, we need to allocate 2945 * a new packet and fill out as many sources as will fit. 2946 * Always try for a cluster first. 2947 */ 2948 while (nims != NULL) { 2949 if (mbufq_full(mq)) { 2950 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2951 return (-ENOMEM); 2952 } 2953 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2954 if (m) 2955 m->m_data += IGMP_LEADINGSPACE; 2956 if (m == NULL) { 2957 m = m_gethdr(M_NOWAIT, MT_DATA); 2958 if (m) 2959 M_ALIGN(m, IGMP_LEADINGSPACE); 2960 } 2961 if (m == NULL) 2962 return (-ENOMEM); 2963 igmp_save_context(m, ifp); 2964 md = m_getptr(m, 0, &off); 2965 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2966 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2967 2968 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2969 if (m != m0) 2970 m_freem(m); 2971 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2972 return (-ENOMEM); 2973 } 2974 m->m_pkthdr.vt_nrecs = 1; 2975 nbytes += sizeof(struct igmp_grouprec); 2976 2977 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2978 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2979 2980 msrcs = 0; 2981 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2982 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2983 ims->ims_haddr); 2984 now = ims_get_mode(inm, ims, 1); 2985 if ((now != mode) || 2986 (now == mode && mode == MCAST_UNDEFINED)) { 2987 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2988 continue; 2989 } 2990 if (is_source_query && ims->ims_stp == 0) { 2991 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2992 __func__); 2993 continue; 2994 } 2995 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2996 naddr = htonl(ims->ims_haddr); 2997 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2998 if (m != m0) 2999 m_freem(m); 3000 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 3001 __func__); 3002 return (-ENOMEM); 3003 } 3004 ++msrcs; 3005 if (msrcs == m0srcs) 3006 break; 3007 } 3008 pig->ig_numsrc = htons(msrcs); 3009 nbytes += (msrcs * sizeof(in_addr_t)); 3010 3011 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 3012 mbufq_enqueue(mq, m); 3013 } 3014 3015 return (nbytes); 3016 } 3017 3018 /* 3019 * Type used to mark record pass completion. 3020 * We exploit the fact we can cast to this easily from the 3021 * current filter modes on each ip_msource node. 3022 */ 3023 typedef enum { 3024 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 3025 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 3026 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 3027 REC_FULL = REC_ALLOW | REC_BLOCK 3028 } rectype_t; 3029 3030 /* 3031 * Enqueue an IGMPv3 filter list change to the given output queue. 3032 * 3033 * Source list filter state is held in an RB-tree. When the filter list 3034 * for a group is changed without changing its mode, we need to compute 3035 * the deltas between T0 and T1 for each source in the filter set, 3036 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 3037 * 3038 * As we may potentially queue two record types, and the entire R-B tree 3039 * needs to be walked at once, we break this out into its own function 3040 * so we can generate a tightly packed queue of packets. 3041 * 3042 * XXX This could be written to only use one tree walk, although that makes 3043 * serializing into the mbuf chains a bit harder. For now we do two walks 3044 * which makes things easier on us, and it may or may not be harder on 3045 * the L2 cache. 3046 * 3047 * If successful the size of all data appended to the queue is returned, 3048 * otherwise an error code less than zero is returned, or zero if 3049 * no record(s) were appended. 3050 */ 3051 static int 3052 igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3053 { 3054 static const int MINRECLEN = 3055 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3056 struct ifnet *ifp; 3057 struct igmp_grouprec ig; 3058 struct igmp_grouprec *pig; 3059 struct ip_msource *ims, *nims; 3060 struct mbuf *m, *m0, *md; 3061 in_addr_t naddr; 3062 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3063 #ifdef KTR 3064 int nallow, nblock; 3065 #endif 3066 uint8_t mode, now, then; 3067 rectype_t crt, drt, nrt; 3068 3069 IN_MULTI_LIST_LOCK_ASSERT(); 3070 3071 if (inm->inm_nsrc == 0 || 3072 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3073 return (0); 3074 3075 ifp = inm->inm_ifp; /* interface */ 3076 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3077 crt = REC_NONE; /* current group record type */ 3078 drt = REC_NONE; /* mask of completed group record types */ 3079 nrt = REC_NONE; /* record type for current node */ 3080 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3081 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3082 npbytes = 0; /* # of bytes appended this packet */ 3083 rsrcs = 0; /* # sources encoded in current record */ 3084 schanged = 0; /* # nodes encoded in overall filter change */ 3085 #ifdef KTR 3086 nallow = 0; /* # of source entries in ALLOW_NEW */ 3087 nblock = 0; /* # of source entries in BLOCK_OLD */ 3088 #endif 3089 nims = NULL; /* next tree node pointer */ 3090 3091 /* 3092 * For each possible filter record mode. 3093 * The first kind of source we encounter tells us which 3094 * is the first kind of record we start appending. 3095 * If a node transitioned to UNDEFINED at t1, its mode is treated 3096 * as the inverse of the group's filter mode. 3097 */ 3098 while (drt != REC_FULL) { 3099 do { 3100 m0 = mbufq_last(mq); 3101 if (m0 != NULL && 3102 (m0->m_pkthdr.vt_nrecs + 1 <= 3103 IGMP_V3_REPORT_MAXRECS) && 3104 (m0->m_pkthdr.len + MINRECLEN) < 3105 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3106 m = m0; 3107 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3108 sizeof(struct igmp_grouprec)) / 3109 sizeof(in_addr_t); 3110 CTR1(KTR_IGMPV3, 3111 "%s: use previous packet", __func__); 3112 } else { 3113 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3114 if (m) 3115 m->m_data += IGMP_LEADINGSPACE; 3116 if (m == NULL) { 3117 m = m_gethdr(M_NOWAIT, MT_DATA); 3118 if (m) 3119 M_ALIGN(m, IGMP_LEADINGSPACE); 3120 } 3121 if (m == NULL) { 3122 CTR1(KTR_IGMPV3, 3123 "%s: m_get*() failed", __func__); 3124 return (-ENOMEM); 3125 } 3126 m->m_pkthdr.vt_nrecs = 0; 3127 igmp_save_context(m, ifp); 3128 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3129 sizeof(struct igmp_grouprec)) / 3130 sizeof(in_addr_t); 3131 npbytes = 0; 3132 CTR1(KTR_IGMPV3, 3133 "%s: allocated new packet", __func__); 3134 } 3135 /* 3136 * Append the IGMP group record header to the 3137 * current packet's data area. 3138 * Recalculate pointer to free space for next 3139 * group record, in case m_append() allocated 3140 * a new mbuf or cluster. 3141 */ 3142 memset(&ig, 0, sizeof(ig)); 3143 ig.ig_group = inm->inm_addr; 3144 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3145 if (m != m0) 3146 m_freem(m); 3147 CTR1(KTR_IGMPV3, 3148 "%s: m_append() failed", __func__); 3149 return (-ENOMEM); 3150 } 3151 npbytes += sizeof(struct igmp_grouprec); 3152 if (m != m0) { 3153 /* new packet; offset in c hain */ 3154 md = m_getptr(m, npbytes - 3155 sizeof(struct igmp_grouprec), &off); 3156 pig = (struct igmp_grouprec *)(mtod(md, 3157 uint8_t *) + off); 3158 } else { 3159 /* current packet; offset from last append */ 3160 md = m_last(m); 3161 pig = (struct igmp_grouprec *)(mtod(md, 3162 uint8_t *) + md->m_len - 3163 sizeof(struct igmp_grouprec)); 3164 } 3165 /* 3166 * Begin walking the tree for this record type 3167 * pass, or continue from where we left off 3168 * previously if we had to allocate a new packet. 3169 * Only report deltas in-mode at t1. 3170 * We need not report included sources as allowed 3171 * if we are in inclusive mode on the group, 3172 * however the converse is not true. 3173 */ 3174 rsrcs = 0; 3175 if (nims == NULL) 3176 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3177 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3178 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", 3179 __func__, ims->ims_haddr); 3180 now = ims_get_mode(inm, ims, 1); 3181 then = ims_get_mode(inm, ims, 0); 3182 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3183 __func__, then, now); 3184 if (now == then) { 3185 CTR1(KTR_IGMPV3, 3186 "%s: skip unchanged", __func__); 3187 continue; 3188 } 3189 if (mode == MCAST_EXCLUDE && 3190 now == MCAST_INCLUDE) { 3191 CTR1(KTR_IGMPV3, 3192 "%s: skip IN src on EX group", 3193 __func__); 3194 continue; 3195 } 3196 nrt = (rectype_t)now; 3197 if (nrt == REC_NONE) 3198 nrt = (rectype_t)(~mode & REC_FULL); 3199 if (schanged++ == 0) { 3200 crt = nrt; 3201 } else if (crt != nrt) 3202 continue; 3203 naddr = htonl(ims->ims_haddr); 3204 if (!m_append(m, sizeof(in_addr_t), 3205 (void *)&naddr)) { 3206 if (m != m0) 3207 m_freem(m); 3208 CTR1(KTR_IGMPV3, 3209 "%s: m_append() failed", __func__); 3210 return (-ENOMEM); 3211 } 3212 #ifdef KTR 3213 nallow += !!(crt == REC_ALLOW); 3214 nblock += !!(crt == REC_BLOCK); 3215 #endif 3216 if (++rsrcs == m0srcs) 3217 break; 3218 } 3219 /* 3220 * If we did not append any tree nodes on this 3221 * pass, back out of allocations. 3222 */ 3223 if (rsrcs == 0) { 3224 npbytes -= sizeof(struct igmp_grouprec); 3225 if (m != m0) { 3226 CTR1(KTR_IGMPV3, 3227 "%s: m_free(m)", __func__); 3228 m_freem(m); 3229 } else { 3230 CTR1(KTR_IGMPV3, 3231 "%s: m_adj(m, -ig)", __func__); 3232 m_adj(m, -((int)sizeof( 3233 struct igmp_grouprec))); 3234 } 3235 continue; 3236 } 3237 npbytes += (rsrcs * sizeof(in_addr_t)); 3238 if (crt == REC_ALLOW) 3239 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3240 else if (crt == REC_BLOCK) 3241 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3242 pig->ig_numsrc = htons(rsrcs); 3243 /* 3244 * Count the new group record, and enqueue this 3245 * packet if it wasn't already queued. 3246 */ 3247 m->m_pkthdr.vt_nrecs++; 3248 if (m != m0) 3249 mbufq_enqueue(mq, m); 3250 nbytes += npbytes; 3251 } while (nims != NULL); 3252 drt |= crt; 3253 crt = (~crt & REC_FULL); 3254 } 3255 3256 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3257 nallow, nblock); 3258 3259 return (nbytes); 3260 } 3261 3262 static int 3263 igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3264 { 3265 struct mbufq *gq; 3266 struct mbuf *m; /* pending state-change */ 3267 struct mbuf *m0; /* copy of pending state-change */ 3268 struct mbuf *mt; /* last state-change in packet */ 3269 int docopy, domerge; 3270 u_int recslen; 3271 3272 docopy = 0; 3273 domerge = 0; 3274 recslen = 0; 3275 3276 IN_MULTI_LIST_LOCK_ASSERT(); 3277 IGMP_LOCK_ASSERT(); 3278 3279 /* 3280 * If there are further pending retransmissions, make a writable 3281 * copy of each queued state-change message before merging. 3282 */ 3283 if (inm->inm_scrv > 0) 3284 docopy = 1; 3285 3286 gq = &inm->inm_scq; 3287 #ifdef KTR 3288 if (mbufq_first(gq) == NULL) { 3289 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3290 __func__, inm); 3291 } 3292 #endif 3293 3294 m = mbufq_first(gq); 3295 while (m != NULL) { 3296 /* 3297 * Only merge the report into the current packet if 3298 * there is sufficient space to do so; an IGMPv3 report 3299 * packet may only contain 65,535 group records. 3300 * Always use a simple mbuf chain concatentation to do this, 3301 * as large state changes for single groups may have 3302 * allocated clusters. 3303 */ 3304 domerge = 0; 3305 mt = mbufq_last(scq); 3306 if (mt != NULL) { 3307 recslen = m_length(m, NULL); 3308 3309 if ((mt->m_pkthdr.vt_nrecs + 3310 m->m_pkthdr.vt_nrecs <= 3311 IGMP_V3_REPORT_MAXRECS) && 3312 (mt->m_pkthdr.len + recslen <= 3313 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3314 domerge = 1; 3315 } 3316 3317 if (!domerge && mbufq_full(gq)) { 3318 CTR2(KTR_IGMPV3, 3319 "%s: outbound queue full, skipping whole packet %p", 3320 __func__, m); 3321 mt = m->m_nextpkt; 3322 if (!docopy) 3323 m_freem(m); 3324 m = mt; 3325 continue; 3326 } 3327 3328 if (!docopy) { 3329 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3330 m0 = mbufq_dequeue(gq); 3331 m = m0->m_nextpkt; 3332 } else { 3333 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3334 m0 = m_dup(m, M_NOWAIT); 3335 if (m0 == NULL) 3336 return (ENOMEM); 3337 m0->m_nextpkt = NULL; 3338 m = m->m_nextpkt; 3339 } 3340 3341 if (!domerge) { 3342 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3343 __func__, m0, scq); 3344 mbufq_enqueue(scq, m0); 3345 } else { 3346 struct mbuf *mtl; /* last mbuf of packet mt */ 3347 3348 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3349 __func__, m0, mt); 3350 3351 mtl = m_last(mt); 3352 m0->m_flags &= ~M_PKTHDR; 3353 mt->m_pkthdr.len += recslen; 3354 mt->m_pkthdr.vt_nrecs += 3355 m0->m_pkthdr.vt_nrecs; 3356 3357 mtl->m_next = m0; 3358 } 3359 } 3360 3361 return (0); 3362 } 3363 3364 /* 3365 * Respond to a pending IGMPv3 General Query. 3366 */ 3367 static void 3368 igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3369 { 3370 struct ifmultiaddr *ifma; 3371 struct ifnet *ifp; 3372 struct in_multi *inm; 3373 int retval __unused, loop; 3374 3375 IN_MULTI_LIST_LOCK_ASSERT(); 3376 IGMP_LOCK_ASSERT(); 3377 NET_EPOCH_ASSERT(); 3378 3379 KASSERT(igi->igi_version == IGMP_VERSION_3, 3380 ("%s: called when version %d", __func__, igi->igi_version)); 3381 3382 /* 3383 * Check that there are some packets queued. If so, send them first. 3384 * For large number of groups the reply to general query can take 3385 * many packets, we should finish sending them before starting of 3386 * queuing the new reply. 3387 */ 3388 if (mbufq_len(&igi->igi_gq) != 0) 3389 goto send; 3390 3391 ifp = igi->igi_ifp; 3392 3393 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3394 inm = inm_ifmultiaddr_get_inm(ifma); 3395 if (inm == NULL) 3396 continue; 3397 KASSERT(ifp == inm->inm_ifp, 3398 ("%s: inconsistent ifp", __func__)); 3399 3400 switch (inm->inm_state) { 3401 case IGMP_NOT_MEMBER: 3402 case IGMP_SILENT_MEMBER: 3403 break; 3404 case IGMP_REPORTING_MEMBER: 3405 case IGMP_IDLE_MEMBER: 3406 case IGMP_LAZY_MEMBER: 3407 case IGMP_SLEEPING_MEMBER: 3408 case IGMP_AWAKENING_MEMBER: 3409 inm->inm_state = IGMP_REPORTING_MEMBER; 3410 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3411 inm, 0, 0, 0); 3412 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3413 __func__, retval); 3414 break; 3415 case IGMP_G_QUERY_PENDING_MEMBER: 3416 case IGMP_SG_QUERY_PENDING_MEMBER: 3417 case IGMP_LEAVING_MEMBER: 3418 break; 3419 } 3420 } 3421 3422 send: 3423 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3424 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3425 3426 /* 3427 * Slew transmission of bursts over 500ms intervals. 3428 */ 3429 if (mbufq_first(&igi->igi_gq) != NULL) { 3430 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3431 IGMP_RESPONSE_BURST_INTERVAL); 3432 V_interface_timers_running = 1; 3433 } 3434 } 3435 3436 /* 3437 * Transmit the next pending IGMP message in the output queue. 3438 * 3439 * We get called from netisr_processqueue(). A mutex private to igmpoq 3440 * will be acquired and released around this routine. 3441 * 3442 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3443 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3444 * a link and uses a link-scope multicast address. 3445 */ 3446 static void 3447 igmp_intr(struct mbuf *m) 3448 { 3449 struct ip_moptions imo; 3450 struct ifnet *ifp; 3451 struct mbuf *ipopts, *m0; 3452 int error; 3453 uint32_t ifindex; 3454 3455 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3456 3457 /* 3458 * Set VNET image pointer from enqueued mbuf chain 3459 * before doing anything else. Whilst we use interface 3460 * indexes to guard against interface detach, they are 3461 * unique to each VIMAGE and must be retrieved. 3462 */ 3463 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3464 ifindex = igmp_restore_context(m); 3465 3466 /* 3467 * Check if the ifnet still exists. This limits the scope of 3468 * any race in the absence of a global ifp lock for low cost 3469 * (an array lookup). 3470 */ 3471 ifp = ifnet_byindex(ifindex); 3472 if (ifp == NULL) { 3473 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3474 __func__, m, ifindex); 3475 m_freem(m); 3476 IPSTAT_INC(ips_noroute); 3477 goto out; 3478 } 3479 3480 ipopts = V_igmp_sendra ? m_raopt : NULL; 3481 3482 imo.imo_multicast_ttl = 1; 3483 imo.imo_multicast_vif = -1; 3484 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3485 3486 /* 3487 * If the user requested that IGMP traffic be explicitly 3488 * redirected to the loopback interface (e.g. they are running a 3489 * MANET interface and the routing protocol needs to see the 3490 * updates), handle this now. 3491 */ 3492 if (m->m_flags & M_IGMP_LOOP) 3493 imo.imo_multicast_ifp = V_loif; 3494 else 3495 imo.imo_multicast_ifp = ifp; 3496 3497 if (m->m_flags & M_IGMPV2) { 3498 m0 = m; 3499 } else { 3500 m0 = igmp_v3_encap_report(ifp, m); 3501 if (m0 == NULL) { 3502 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3503 m_freem(m); 3504 IPSTAT_INC(ips_odropped); 3505 goto out; 3506 } 3507 } 3508 3509 igmp_scrub_context(m0); 3510 m_clrprotoflags(m); 3511 m0->m_pkthdr.rcvif = V_loif; 3512 #ifdef MAC 3513 mac_netinet_igmp_send(ifp, m0); 3514 #endif 3515 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3516 if (error) { 3517 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3518 goto out; 3519 } 3520 3521 IGMPSTAT_INC(igps_snd_reports); 3522 3523 out: 3524 /* 3525 * We must restore the existing vnet pointer before 3526 * continuing as we are run from netisr context. 3527 */ 3528 CURVNET_RESTORE(); 3529 } 3530 3531 /* 3532 * Encapsulate an IGMPv3 report. 3533 * 3534 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3535 * chain has already had its IP/IGMPv3 header prepended. In this case 3536 * the function will not attempt to prepend; the lengths and checksums 3537 * will however be re-computed. 3538 * 3539 * Returns a pointer to the new mbuf chain head, or NULL if the 3540 * allocation failed. 3541 */ 3542 static struct mbuf * 3543 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3544 { 3545 struct igmp_report *igmp; 3546 struct ip *ip; 3547 int hdrlen, igmpreclen; 3548 3549 KASSERT((m->m_flags & M_PKTHDR), 3550 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3551 3552 igmpreclen = m_length(m, NULL); 3553 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); 3554 3555 if (m->m_flags & M_IGMPV3_HDR) { 3556 igmpreclen -= hdrlen; 3557 } else { 3558 M_PREPEND(m, hdrlen, M_NOWAIT); 3559 if (m == NULL) 3560 return (NULL); 3561 m->m_flags |= M_IGMPV3_HDR; 3562 } 3563 3564 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen); 3565 3566 m->m_data += sizeof(struct ip); 3567 m->m_len -= sizeof(struct ip); 3568 3569 igmp = mtod(m, struct igmp_report *); 3570 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; 3571 igmp->ir_rsv1 = 0; 3572 igmp->ir_rsv2 = 0; 3573 igmp->ir_numgrps = htons(m->m_pkthdr.vt_nrecs); 3574 igmp->ir_cksum = 0; 3575 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3576 m->m_pkthdr.vt_nrecs = 0; 3577 3578 m->m_data -= sizeof(struct ip); 3579 m->m_len += sizeof(struct ip); 3580 3581 ip = mtod(m, struct ip *); 3582 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; 3583 ip->ip_len = htons(hdrlen + igmpreclen); 3584 ip->ip_off = htons(IP_DF); 3585 ip->ip_p = IPPROTO_IGMP; 3586 ip->ip_sum = 0; 3587 3588 ip->ip_src.s_addr = INADDR_ANY; 3589 3590 if (m->m_flags & M_IGMP_LOOP) { 3591 struct in_ifaddr *ia; 3592 3593 IFP_TO_IA(ifp, ia); 3594 if (ia != NULL) 3595 ip->ip_src = ia->ia_addr.sin_addr; 3596 } 3597 3598 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); 3599 3600 return (m); 3601 } 3602 3603 #ifdef KTR 3604 static char * 3605 igmp_rec_type_to_str(const int type) 3606 { 3607 3608 switch (type) { 3609 case IGMP_CHANGE_TO_EXCLUDE_MODE: 3610 return "TO_EX"; 3611 break; 3612 case IGMP_CHANGE_TO_INCLUDE_MODE: 3613 return "TO_IN"; 3614 break; 3615 case IGMP_MODE_IS_EXCLUDE: 3616 return "MODE_EX"; 3617 break; 3618 case IGMP_MODE_IS_INCLUDE: 3619 return "MODE_IN"; 3620 break; 3621 case IGMP_ALLOW_NEW_SOURCES: 3622 return "ALLOW_NEW"; 3623 break; 3624 case IGMP_BLOCK_OLD_SOURCES: 3625 return "BLOCK_OLD"; 3626 break; 3627 default: 3628 break; 3629 } 3630 return "unknown"; 3631 } 3632 #endif 3633 3634 #ifdef VIMAGE 3635 static void 3636 vnet_igmp_init(const void *unused __unused) 3637 { 3638 3639 netisr_register_vnet(&igmp_nh); 3640 } 3641 VNET_SYSINIT(vnet_igmp_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3642 vnet_igmp_init, NULL); 3643 3644 static void 3645 vnet_igmp_uninit(const void *unused __unused) 3646 { 3647 3648 /* This can happen when we shutdown the entire network stack. */ 3649 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3650 3651 netisr_unregister_vnet(&igmp_nh); 3652 } 3653 VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3654 vnet_igmp_uninit, NULL); 3655 #endif 3656 3657 #ifdef DDB 3658 DB_SHOW_COMMAND(igi_list, db_show_igi_list) 3659 { 3660 struct igmp_ifsoftc *igi, *tigi; 3661 LIST_HEAD(_igi_list, igmp_ifsoftc) *igi_head; 3662 3663 if (!have_addr) { 3664 db_printf("usage: show igi_list <addr>\n"); 3665 return; 3666 } 3667 igi_head = (struct _igi_list *)addr; 3668 3669 LIST_FOREACH_SAFE(igi, igi_head, igi_link, tigi) { 3670 db_printf("igmp_ifsoftc %p:\n", igi); 3671 db_printf(" ifp %p\n", igi->igi_ifp); 3672 db_printf(" version %u\n", igi->igi_version); 3673 db_printf(" v1_timer %u\n", igi->igi_v1_timer); 3674 db_printf(" v2_timer %u\n", igi->igi_v2_timer); 3675 db_printf(" v3_timer %u\n", igi->igi_v3_timer); 3676 db_printf(" flags %#x\n", igi->igi_flags); 3677 db_printf(" rv %u\n", igi->igi_rv); 3678 db_printf(" qi %u\n", igi->igi_qi); 3679 db_printf(" qri %u\n", igi->igi_qri); 3680 db_printf(" uri %u\n", igi->igi_uri); 3681 /* struct mbufq igi_gq; */ 3682 db_printf("\n"); 3683 } 3684 } 3685 #endif 3686 3687 static int 3688 igmp_modevent(module_t mod, int type, void *unused __unused) 3689 { 3690 3691 switch (type) { 3692 case MOD_LOAD: 3693 CTR1(KTR_IGMPV3, "%s: initializing", __func__); 3694 IGMP_LOCK_INIT(); 3695 m_raopt = igmp_ra_alloc(); 3696 netisr_register(&igmp_nh); 3697 callout_init(&igmpslow_callout, 1); 3698 callout_reset(&igmpslow_callout, hz / IGMP_SLOWHZ, 3699 igmp_slowtimo, NULL); 3700 callout_init(&igmpfast_callout, 1); 3701 callout_reset(&igmpfast_callout, hz / IGMP_FASTHZ, 3702 igmp_fasttimo, NULL); 3703 break; 3704 case MOD_UNLOAD: 3705 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3706 netisr_unregister(&igmp_nh); 3707 m_free(m_raopt); 3708 m_raopt = NULL; 3709 IGMP_LOCK_DESTROY(); 3710 break; 3711 default: 3712 return (EOPNOTSUPP); 3713 } 3714 return (0); 3715 } 3716 3717 static moduledata_t igmp_mod = { 3718 "igmp", 3719 igmp_modevent, 3720 0 3721 }; 3722 DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE); 3723