1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2007-2009 Bruce Simpson. 5 * Copyright (c) 1988 Stephen Deering. 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Stephen Deering of Stanford University. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)igmp.c 8.1 (Berkeley) 7/19/93 37 */ 38 39 /* 40 * Internet Group Management Protocol (IGMP) routines. 41 * [RFC1112, RFC2236, RFC3376] 42 * 43 * Written by Steve Deering, Stanford, May 1988. 44 * Modified by Rosen Sharma, Stanford, Aug 1994. 45 * Modified by Bill Fenner, Xerox PARC, Feb 1995. 46 * Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995. 47 * Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson. 48 * 49 * MULTICAST Revision: 3.5.1.4 50 */ 51 52 #include <sys/cdefs.h> 53 __FBSDID("$FreeBSD$"); 54 55 #include "opt_ddb.h" 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/module.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/socket.h> 63 #include <sys/kernel.h> 64 #include <sys/lock.h> 65 #include <sys/sysctl.h> 66 #include <sys/ktr.h> 67 #include <sys/condvar.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #endif 72 73 #include <net/if.h> 74 #include <net/if_var.h> 75 #include <net/netisr.h> 76 #include <net/vnet.h> 77 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 #include <netinet/in_systm.h> 81 #include <netinet/ip.h> 82 #include <netinet/ip_var.h> 83 #include <netinet/ip_options.h> 84 #include <netinet/igmp.h> 85 #include <netinet/igmp_var.h> 86 87 #include <machine/in_cksum.h> 88 89 #include <security/mac/mac_framework.h> 90 91 #ifndef KTR_IGMPV3 92 #define KTR_IGMPV3 KTR_INET 93 #endif 94 95 #define IGMP_SLOWHZ 2 /* 2 slow timeouts per second */ 96 #define IGMP_FASTHZ 5 /* 5 fast timeouts per second */ 97 #define IGMP_RESPONSE_BURST_INTERVAL (IGMP_FASTHZ / 2) 98 99 static struct igmp_ifsoftc * 100 igi_alloc_locked(struct ifnet *); 101 static void igi_delete_locked(const struct ifnet *); 102 static void igmp_dispatch_queue(struct mbufq *, int, const int); 103 static void igmp_fasttimo_vnet(void); 104 static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 105 static int igmp_handle_state_change(struct in_multi *, 106 struct igmp_ifsoftc *); 107 static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 108 static int igmp_input_v1_query(struct ifnet *, const struct ip *, 109 const struct igmp *); 110 static int igmp_input_v2_query(struct ifnet *, const struct ip *, 111 const struct igmp *); 112 static int igmp_input_v3_query(struct ifnet *, const struct ip *, 113 /*const*/ struct igmpv3 *); 114 static int igmp_input_v3_group_query(struct in_multi *, 115 struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 116 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 117 /*const*/ struct igmp *); 118 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 119 /*const*/ struct igmp *); 120 static void igmp_intr(struct mbuf *); 121 static int igmp_isgroupreported(const struct in_addr); 122 static struct mbuf * 123 igmp_ra_alloc(void); 124 #ifdef KTR 125 static char * igmp_rec_type_to_str(const int); 126 #endif 127 static void igmp_set_version(struct igmp_ifsoftc *, const int); 128 static void igmp_slowtimo_vnet(void); 129 static int igmp_v1v2_queue_report(struct in_multi *, const int); 130 static void igmp_v1v2_process_group_timer(struct in_multi *, const int); 131 static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 132 static void igmp_v2_update_group(struct in_multi *, const int); 133 static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 134 static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 135 static struct mbuf * 136 igmp_v3_encap_report(struct ifnet *, struct mbuf *); 137 static int igmp_v3_enqueue_group_record(struct mbufq *, 138 struct in_multi *, const int, const int, const int); 139 static int igmp_v3_enqueue_filter_change(struct mbufq *, 140 struct in_multi *); 141 static void igmp_v3_process_group_timers(struct in_multi_head *, 142 struct mbufq *, struct mbufq *, struct in_multi *, 143 const int); 144 static int igmp_v3_merge_state_changes(struct in_multi *, 145 struct mbufq *); 146 static void igmp_v3_suppress_group_record(struct in_multi *); 147 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 148 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 149 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 150 static int sysctl_igmp_stat(SYSCTL_HANDLER_ARGS); 151 152 static const struct netisr_handler igmp_nh = { 153 .nh_name = "igmp", 154 .nh_handler = igmp_intr, 155 .nh_proto = NETISR_IGMP, 156 .nh_policy = NETISR_POLICY_SOURCE, 157 }; 158 159 /* 160 * System-wide globals. 161 * 162 * Unlocked access to these is OK, except for the global IGMP output 163 * queue. The IGMP subsystem lock ends up being system-wide for the moment, 164 * because all VIMAGEs have to share a global output queue, as netisrs 165 * themselves are not virtualized. 166 * 167 * Locking: 168 * * The permitted lock order is: IN_MULTI_LIST_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 169 * Any may be taken independently; if any are held at the same 170 * time, the above lock order must be followed. 171 * * All output is delegated to the netisr. 172 * Now that Giant has been eliminated, the netisr may be inlined. 173 * * IN_MULTI_LIST_LOCK covers in_multi. 174 * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 175 * including the output queue. 176 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 177 * per-link state iterators. 178 * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 179 * therefore it is not refcounted. 180 * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 181 * 182 * Reference counting 183 * * IGMP acquires its own reference every time an in_multi is passed to 184 * it and the group is being joined for the first time. 185 * * IGMP releases its reference(s) on in_multi in a deferred way, 186 * because the operations which process the release run as part of 187 * a loop whose control variables are directly affected by the release 188 * (that, and not recursing on the IF_ADDR_LOCK). 189 * 190 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 191 * to a vnet in ifp->if_vnet. 192 * 193 * SMPng: XXX We may potentially race operations on ifma_protospec. 194 * The problem is that we currently lack a clean way of taking the 195 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 196 * as anything which modifies ifma needs to be covered by that lock. 197 * So check for ifma_protospec being NULL before proceeding. 198 */ 199 struct mtx igmp_mtx; 200 201 struct mbuf *m_raopt; /* Router Alert option */ 202 static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 203 204 /* 205 * VIMAGE-wide globals. 206 * 207 * The IGMPv3 timers themselves need to run per-image, however, for 208 * historical reasons, timers run globally. This needs to be improved. 209 * An ifnet can only be in one vimage at a time, and the loopback 210 * ifnet, loif, is itself virtualized. 211 * It would otherwise be possible to seriously hose IGMP state, 212 * and create inconsistencies in upstream multicast routing, if you have 213 * multiple VIMAGEs running on the same link joining different multicast 214 * groups, UNLESS the "primary IP address" is different. This is because 215 * IGMP for IPv4 does not force link-local addresses to be used for each 216 * node, unlike MLD for IPv6. 217 * Obviously the IGMPv3 per-interface state has per-vimage granularity 218 * also as a result. 219 * 220 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 221 * policy to control the address used by IGMP on the link. 222 */ 223 VNET_DEFINE_STATIC(int, interface_timers_running); /* IGMPv3 general 224 * query response */ 225 VNET_DEFINE_STATIC(int, state_change_timers_running); /* IGMPv3 state-change 226 * retransmit */ 227 VNET_DEFINE_STATIC(int, current_state_timers_running); /* IGMPv1/v2 host 228 * report; IGMPv3 g/sg 229 * query response */ 230 231 #define V_interface_timers_running VNET(interface_timers_running) 232 #define V_state_change_timers_running VNET(state_change_timers_running) 233 #define V_current_state_timers_running VNET(current_state_timers_running) 234 235 VNET_PCPUSTAT_DEFINE(struct igmpstat, igmpstat); 236 VNET_PCPUSTAT_SYSINIT(igmpstat); 237 VNET_PCPUSTAT_SYSUNINIT(igmpstat); 238 239 VNET_DEFINE_STATIC(LIST_HEAD(, igmp_ifsoftc), igi_head) = 240 LIST_HEAD_INITIALIZER(igi_head); 241 VNET_DEFINE_STATIC(struct timeval, igmp_gsrdelay) = {10, 0}; 242 243 #define V_igi_head VNET(igi_head) 244 #define V_igmp_gsrdelay VNET(igmp_gsrdelay) 245 246 VNET_DEFINE_STATIC(int, igmp_recvifkludge) = 1; 247 VNET_DEFINE_STATIC(int, igmp_sendra) = 1; 248 VNET_DEFINE_STATIC(int, igmp_sendlocal) = 1; 249 VNET_DEFINE_STATIC(int, igmp_v1enable) = 1; 250 VNET_DEFINE_STATIC(int, igmp_v2enable) = 1; 251 VNET_DEFINE_STATIC(int, igmp_legacysupp); 252 VNET_DEFINE_STATIC(int, igmp_default_version) = IGMP_VERSION_3; 253 254 #define V_igmp_recvifkludge VNET(igmp_recvifkludge) 255 #define V_igmp_sendra VNET(igmp_sendra) 256 #define V_igmp_sendlocal VNET(igmp_sendlocal) 257 #define V_igmp_v1enable VNET(igmp_v1enable) 258 #define V_igmp_v2enable VNET(igmp_v2enable) 259 #define V_igmp_legacysupp VNET(igmp_legacysupp) 260 #define V_igmp_default_version VNET(igmp_default_version) 261 262 /* 263 * Virtualized sysctls. 264 */ 265 SYSCTL_PROC(_net_inet_igmp, IGMPCTL_STATS, stats, 266 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_MPSAFE, 267 &VNET_NAME(igmpstat), 0, sysctl_igmp_stat, "S,igmpstat", 268 "IGMP statistics (struct igmpstat, netinet/igmp_var.h)"); 269 SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 270 &VNET_NAME(igmp_recvifkludge), 0, 271 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 272 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 273 &VNET_NAME(igmp_sendra), 0, 274 "Send IP Router Alert option in IGMPv2/v3 messages"); 275 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 276 &VNET_NAME(igmp_sendlocal), 0, 277 "Send IGMP membership reports for 224.0.0.0/24 groups"); 278 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 279 &VNET_NAME(igmp_v1enable), 0, 280 "Enable backwards compatibility with IGMPv1"); 281 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 282 &VNET_NAME(igmp_v2enable), 0, 283 "Enable backwards compatibility with IGMPv2"); 284 SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 285 &VNET_NAME(igmp_legacysupp), 0, 286 "Allow v1/v2 reports to suppress v3 group responses"); 287 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 288 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 289 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 290 "Default version of IGMP to run on each interface"); 291 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 292 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 293 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 294 "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 295 296 /* 297 * Non-virtualized sysctls. 298 */ 299 static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 300 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 301 "Per-interface IGMPv3 state"); 302 303 static __inline void 304 igmp_save_context(struct mbuf *m, struct ifnet *ifp) 305 { 306 307 #ifdef VIMAGE 308 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 309 #endif /* VIMAGE */ 310 m->m_pkthdr.rcvif = ifp; 311 m->m_pkthdr.flowid = ifp->if_index; 312 } 313 314 static __inline void 315 igmp_scrub_context(struct mbuf *m) 316 { 317 318 m->m_pkthdr.PH_loc.ptr = NULL; 319 m->m_pkthdr.flowid = 0; 320 } 321 322 /* 323 * Restore context from a queued IGMP output chain. 324 * Return saved ifindex. 325 * 326 * VIMAGE: The assertion is there to make sure that we 327 * actually called CURVNET_SET() with what's in the mbuf chain. 328 */ 329 static __inline uint32_t 330 igmp_restore_context(struct mbuf *m) 331 { 332 333 #ifdef notyet 334 #if defined(VIMAGE) && defined(INVARIANTS) 335 KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 336 ("%s: called when curvnet was not restored", __func__)); 337 #endif 338 #endif 339 return (m->m_pkthdr.flowid); 340 } 341 342 /* 343 * IGMP statistics. 344 */ 345 static int 346 sysctl_igmp_stat(SYSCTL_HANDLER_ARGS) 347 { 348 struct igmpstat igps0; 349 int error; 350 char *p; 351 352 error = sysctl_wire_old_buffer(req, sizeof(struct igmpstat)); 353 if (error) 354 return (error); 355 356 if (req->oldptr != NULL) { 357 if (req->oldlen < sizeof(struct igmpstat)) 358 error = ENOMEM; 359 else { 360 /* 361 * Copy the counters, and explicitly set the struct's 362 * version and length fields. 363 */ 364 COUNTER_ARRAY_COPY(VNET(igmpstat), &igps0, 365 sizeof(struct igmpstat) / sizeof(uint64_t)); 366 igps0.igps_version = IGPS_VERSION_3; 367 igps0.igps_len = IGPS_VERSION3_LEN; 368 error = SYSCTL_OUT(req, &igps0, 369 sizeof(struct igmpstat)); 370 } 371 } else 372 req->validlen = sizeof(struct igmpstat); 373 if (error) 374 goto out; 375 if (req->newptr != NULL) { 376 if (req->newlen < sizeof(struct igmpstat)) 377 error = ENOMEM; 378 else 379 error = SYSCTL_IN(req, &igps0, 380 sizeof(igps0)); 381 if (error) 382 goto out; 383 /* 384 * igps0 must be "all zero". 385 */ 386 p = (char *)&igps0; 387 while (p < (char *)&igps0 + sizeof(igps0) && *p == '\0') 388 p++; 389 if (p != (char *)&igps0 + sizeof(igps0)) { 390 error = EINVAL; 391 goto out; 392 } 393 COUNTER_ARRAY_ZERO(VNET(igmpstat), 394 sizeof(struct igmpstat) / sizeof(uint64_t)); 395 } 396 out: 397 return (error); 398 } 399 400 /* 401 * Retrieve or set default IGMP version. 402 * 403 * VIMAGE: Assume curvnet set by caller. 404 * SMPng: NOTE: Serialized by IGMP lock. 405 */ 406 static int 407 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 408 { 409 int error; 410 int new; 411 412 error = sysctl_wire_old_buffer(req, sizeof(int)); 413 if (error) 414 return (error); 415 416 IGMP_LOCK(); 417 418 new = V_igmp_default_version; 419 420 error = sysctl_handle_int(oidp, &new, 0, req); 421 if (error || !req->newptr) 422 goto out_locked; 423 424 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 425 error = EINVAL; 426 goto out_locked; 427 } 428 429 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 430 V_igmp_default_version, new); 431 432 V_igmp_default_version = new; 433 434 out_locked: 435 IGMP_UNLOCK(); 436 return (error); 437 } 438 439 /* 440 * Retrieve or set threshold between group-source queries in seconds. 441 * 442 * VIMAGE: Assume curvnet set by caller. 443 * SMPng: NOTE: Serialized by IGMP lock. 444 */ 445 static int 446 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 447 { 448 int error; 449 int i; 450 451 error = sysctl_wire_old_buffer(req, sizeof(int)); 452 if (error) 453 return (error); 454 455 IGMP_LOCK(); 456 457 i = V_igmp_gsrdelay.tv_sec; 458 459 error = sysctl_handle_int(oidp, &i, 0, req); 460 if (error || !req->newptr) 461 goto out_locked; 462 463 if (i < -1 || i >= 60) { 464 error = EINVAL; 465 goto out_locked; 466 } 467 468 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 469 V_igmp_gsrdelay.tv_sec, i); 470 V_igmp_gsrdelay.tv_sec = i; 471 472 out_locked: 473 IGMP_UNLOCK(); 474 return (error); 475 } 476 477 /* 478 * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 479 * For use by ifmcstat(8). 480 * 481 * SMPng: NOTE: Does an unlocked ifindex space read. 482 * VIMAGE: Assume curvnet set by caller. The node handler itself 483 * is not directly virtualized. 484 */ 485 static int 486 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 487 { 488 struct epoch_tracker et; 489 int *name; 490 int error; 491 u_int namelen; 492 struct ifnet *ifp; 493 struct igmp_ifsoftc *igi; 494 495 name = (int *)arg1; 496 namelen = arg2; 497 498 if (req->newptr != NULL) 499 return (EPERM); 500 501 if (namelen != 1) 502 return (EINVAL); 503 504 error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo)); 505 if (error) 506 return (error); 507 508 IN_MULTI_LIST_LOCK(); 509 IGMP_LOCK(); 510 511 error = ENOENT; 512 513 NET_EPOCH_ENTER(et); 514 ifp = ifnet_byindex(name[0]); 515 NET_EPOCH_EXIT(et); 516 if (ifp == NULL) 517 goto out_locked; 518 519 LIST_FOREACH(igi, &V_igi_head, igi_link) { 520 if (ifp == igi->igi_ifp) { 521 struct igmp_ifinfo info; 522 523 info.igi_version = igi->igi_version; 524 info.igi_v1_timer = igi->igi_v1_timer; 525 info.igi_v2_timer = igi->igi_v2_timer; 526 info.igi_v3_timer = igi->igi_v3_timer; 527 info.igi_flags = igi->igi_flags; 528 info.igi_rv = igi->igi_rv; 529 info.igi_qi = igi->igi_qi; 530 info.igi_qri = igi->igi_qri; 531 info.igi_uri = igi->igi_uri; 532 error = SYSCTL_OUT(req, &info, sizeof(info)); 533 break; 534 } 535 } 536 537 out_locked: 538 IGMP_UNLOCK(); 539 IN_MULTI_LIST_UNLOCK(); 540 return (error); 541 } 542 543 /* 544 * Dispatch an entire queue of pending packet chains 545 * using the netisr. 546 * VIMAGE: Assumes the vnet pointer has been set. 547 */ 548 static void 549 igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 550 { 551 struct epoch_tracker et; 552 struct mbuf *m; 553 554 NET_EPOCH_ENTER(et); 555 while ((m = mbufq_dequeue(mq)) != NULL) { 556 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 557 if (loop) 558 m->m_flags |= M_IGMP_LOOP; 559 netisr_dispatch(NETISR_IGMP, m); 560 if (--limit == 0) 561 break; 562 } 563 NET_EPOCH_EXIT(et); 564 } 565 566 /* 567 * Filter outgoing IGMP report state by group. 568 * 569 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 570 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 571 * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 572 * this may break certain IGMP snooping switches which rely on the old 573 * report behaviour. 574 * 575 * Return zero if the given group is one for which IGMP reports 576 * should be suppressed, or non-zero if reports should be issued. 577 */ 578 static __inline int 579 igmp_isgroupreported(const struct in_addr addr) 580 { 581 582 if (in_allhosts(addr) || 583 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 584 return (0); 585 586 return (1); 587 } 588 589 /* 590 * Construct a Router Alert option to use in outgoing packets. 591 */ 592 static struct mbuf * 593 igmp_ra_alloc(void) 594 { 595 struct mbuf *m; 596 struct ipoption *p; 597 598 m = m_get(M_WAITOK, MT_DATA); 599 p = mtod(m, struct ipoption *); 600 p->ipopt_dst.s_addr = INADDR_ANY; 601 p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 602 p->ipopt_list[1] = 0x04; /* 4 bytes long */ 603 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 604 p->ipopt_list[3] = 0x00; /* pad byte */ 605 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 606 607 return (m); 608 } 609 610 /* 611 * Attach IGMP when PF_INET is attached to an interface. 612 */ 613 struct igmp_ifsoftc * 614 igmp_domifattach(struct ifnet *ifp) 615 { 616 struct igmp_ifsoftc *igi; 617 618 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 619 __func__, ifp, ifp->if_xname); 620 621 IGMP_LOCK(); 622 623 igi = igi_alloc_locked(ifp); 624 if (!(ifp->if_flags & IFF_MULTICAST)) 625 igi->igi_flags |= IGIF_SILENT; 626 627 IGMP_UNLOCK(); 628 629 return (igi); 630 } 631 632 /* 633 * VIMAGE: assume curvnet set by caller. 634 */ 635 static struct igmp_ifsoftc * 636 igi_alloc_locked(/*const*/ struct ifnet *ifp) 637 { 638 struct igmp_ifsoftc *igi; 639 640 IGMP_LOCK_ASSERT(); 641 642 igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 643 if (igi == NULL) 644 goto out; 645 646 igi->igi_ifp = ifp; 647 igi->igi_version = V_igmp_default_version; 648 igi->igi_flags = 0; 649 igi->igi_rv = IGMP_RV_INIT; 650 igi->igi_qi = IGMP_QI_INIT; 651 igi->igi_qri = IGMP_QRI_INIT; 652 igi->igi_uri = IGMP_URI_INIT; 653 mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 654 655 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 656 657 CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 658 ifp, ifp->if_xname); 659 660 out: 661 return (igi); 662 } 663 664 /* 665 * Hook for ifdetach. 666 * 667 * NOTE: Some finalization tasks need to run before the protocol domain 668 * is detached, but also before the link layer does its cleanup. 669 * 670 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 671 * XXX This is also bitten by unlocked ifma_protospec access. 672 */ 673 void 674 igmp_ifdetach(struct ifnet *ifp) 675 { 676 struct igmp_ifsoftc *igi; 677 struct ifmultiaddr *ifma, *next; 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 restart: 690 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 691 if (ifma->ifma_addr->sa_family != AF_INET || 692 ifma->ifma_protospec == NULL) 693 continue; 694 inm = (struct in_multi *)ifma->ifma_protospec; 695 if (inm->inm_state == IGMP_LEAVING_MEMBER) 696 inm_rele_locked(&inm_free_tmp, inm); 697 inm_clear_recorded(inm); 698 if (__predict_false(ifma_restart)) { 699 ifma_restart = false; 700 goto restart; 701 } 702 } 703 IF_ADDR_WUNLOCK(ifp); 704 inm_release_list_deferred(&inm_free_tmp); 705 } 706 IGMP_UNLOCK(); 707 708 } 709 710 /* 711 * Hook for domifdetach. 712 */ 713 void 714 igmp_domifdetach(struct ifnet *ifp) 715 { 716 717 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 718 __func__, ifp, ifp->if_xname); 719 720 IGMP_LOCK(); 721 igi_delete_locked(ifp); 722 IGMP_UNLOCK(); 723 } 724 725 static void 726 igi_delete_locked(const struct ifnet *ifp) 727 { 728 struct igmp_ifsoftc *igi, *tigi; 729 730 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 731 __func__, ifp, ifp->if_xname); 732 733 IGMP_LOCK_ASSERT(); 734 735 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 736 if (igi->igi_ifp == ifp) { 737 /* 738 * Free deferred General Query responses. 739 */ 740 mbufq_drain(&igi->igi_gq); 741 742 LIST_REMOVE(igi, igi_link); 743 free(igi, M_IGMP); 744 return; 745 } 746 } 747 } 748 749 /* 750 * Process a received IGMPv1 query. 751 * Return non-zero if the message should be dropped. 752 * 753 * VIMAGE: The curvnet pointer is derived from the input ifp. 754 */ 755 static int 756 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 757 const struct igmp *igmp) 758 { 759 struct ifmultiaddr *ifma; 760 struct igmp_ifsoftc *igi; 761 struct in_multi *inm; 762 763 NET_EPOCH_ASSERT(); 764 765 /* 766 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 767 * 224.0.0.1. They are always treated as General Queries. 768 * igmp_group is always ignored. Do not drop it as a userland 769 * daemon may wish to see it. 770 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 771 */ 772 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 773 IGMPSTAT_INC(igps_rcv_badqueries); 774 return (0); 775 } 776 IGMPSTAT_INC(igps_rcv_gen_queries); 777 778 IN_MULTI_LIST_LOCK(); 779 IGMP_LOCK(); 780 781 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 782 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 783 784 if (igi->igi_flags & IGIF_LOOPBACK) { 785 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 786 ifp, ifp->if_xname); 787 goto out_locked; 788 } 789 790 /* 791 * Switch to IGMPv1 host compatibility mode. 792 */ 793 igmp_set_version(igi, IGMP_VERSION_1); 794 795 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 796 797 /* 798 * Start the timers in all of our group records 799 * for the interface on which the query arrived, 800 * except those which are already running. 801 */ 802 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 803 if (ifma->ifma_addr->sa_family != AF_INET || 804 ifma->ifma_protospec == NULL) 805 continue; 806 inm = (struct in_multi *)ifma->ifma_protospec; 807 if (inm->inm_timer != 0) 808 continue; 809 switch (inm->inm_state) { 810 case IGMP_NOT_MEMBER: 811 case IGMP_SILENT_MEMBER: 812 break; 813 case IGMP_G_QUERY_PENDING_MEMBER: 814 case IGMP_SG_QUERY_PENDING_MEMBER: 815 case IGMP_REPORTING_MEMBER: 816 case IGMP_IDLE_MEMBER: 817 case IGMP_LAZY_MEMBER: 818 case IGMP_SLEEPING_MEMBER: 819 case IGMP_AWAKENING_MEMBER: 820 inm->inm_state = IGMP_REPORTING_MEMBER; 821 inm->inm_timer = IGMP_RANDOM_DELAY( 822 IGMP_V1V2_MAX_RI * IGMP_FASTHZ); 823 V_current_state_timers_running = 1; 824 break; 825 case IGMP_LEAVING_MEMBER: 826 break; 827 } 828 } 829 830 out_locked: 831 IGMP_UNLOCK(); 832 IN_MULTI_LIST_UNLOCK(); 833 834 return (0); 835 } 836 837 /* 838 * Process a received IGMPv2 general or group-specific query. 839 */ 840 static int 841 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 842 const struct igmp *igmp) 843 { 844 struct ifmultiaddr *ifma; 845 struct igmp_ifsoftc *igi; 846 struct in_multi *inm; 847 int is_general_query; 848 uint16_t timer; 849 850 NET_EPOCH_ASSERT(); 851 852 is_general_query = 0; 853 854 /* 855 * Validate address fields upfront. 856 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 857 */ 858 if (in_nullhost(igmp->igmp_group)) { 859 /* 860 * IGMPv2 General Query. 861 * If this was not sent to the all-hosts group, ignore it. 862 */ 863 if (!in_allhosts(ip->ip_dst)) 864 return (0); 865 IGMPSTAT_INC(igps_rcv_gen_queries); 866 is_general_query = 1; 867 } else { 868 /* IGMPv2 Group-Specific Query. */ 869 IGMPSTAT_INC(igps_rcv_group_queries); 870 } 871 872 IN_MULTI_LIST_LOCK(); 873 IGMP_LOCK(); 874 875 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 876 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 877 878 if (igi->igi_flags & IGIF_LOOPBACK) { 879 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 880 ifp, ifp->if_xname); 881 goto out_locked; 882 } 883 884 /* 885 * Ignore v2 query if in v1 Compatibility Mode. 886 */ 887 if (igi->igi_version == IGMP_VERSION_1) 888 goto out_locked; 889 890 igmp_set_version(igi, IGMP_VERSION_2); 891 892 timer = igmp->igmp_code * IGMP_FASTHZ / IGMP_TIMER_SCALE; 893 if (timer == 0) 894 timer = 1; 895 896 if (is_general_query) { 897 /* 898 * For each reporting group joined on this 899 * interface, kick the report timer. 900 */ 901 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 902 ifp, ifp->if_xname); 903 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 904 if (ifma->ifma_addr->sa_family != AF_INET || 905 ifma->ifma_protospec == NULL) 906 continue; 907 inm = (struct in_multi *)ifma->ifma_protospec; 908 igmp_v2_update_group(inm, timer); 909 } 910 } else { 911 /* 912 * Group-specific IGMPv2 query, we need only 913 * look up the single group to process it. 914 */ 915 inm = inm_lookup(ifp, igmp->igmp_group); 916 if (inm != NULL) { 917 CTR3(KTR_IGMPV3, 918 "process v2 query 0x%08x on ifp %p(%s)", 919 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 920 igmp_v2_update_group(inm, timer); 921 } 922 } 923 924 out_locked: 925 IGMP_UNLOCK(); 926 IN_MULTI_LIST_UNLOCK(); 927 928 return (0); 929 } 930 931 /* 932 * Update the report timer on a group in response to an IGMPv2 query. 933 * 934 * If we are becoming the reporting member for this group, start the timer. 935 * If we already are the reporting member for this group, and timer is 936 * below the threshold, reset it. 937 * 938 * We may be updating the group for the first time since we switched 939 * to IGMPv3. If we are, then we must clear any recorded source lists, 940 * and transition to REPORTING state; the group timer is overloaded 941 * for group and group-source query responses. 942 * 943 * Unlike IGMPv3, the delay per group should be jittered 944 * to avoid bursts of IGMPv2 reports. 945 */ 946 static void 947 igmp_v2_update_group(struct in_multi *inm, const int timer) 948 { 949 950 CTR4(KTR_IGMPV3, "0x%08x: %s/%s timer=%d", __func__, 951 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname, timer); 952 953 IN_MULTI_LIST_LOCK_ASSERT(); 954 955 switch (inm->inm_state) { 956 case IGMP_NOT_MEMBER: 957 case IGMP_SILENT_MEMBER: 958 break; 959 case IGMP_REPORTING_MEMBER: 960 if (inm->inm_timer != 0 && 961 inm->inm_timer <= timer) { 962 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 963 "skipping.", __func__); 964 break; 965 } 966 /* FALLTHROUGH */ 967 case IGMP_SG_QUERY_PENDING_MEMBER: 968 case IGMP_G_QUERY_PENDING_MEMBER: 969 case IGMP_IDLE_MEMBER: 970 case IGMP_LAZY_MEMBER: 971 case IGMP_AWAKENING_MEMBER: 972 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 973 inm->inm_state = IGMP_REPORTING_MEMBER; 974 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 975 V_current_state_timers_running = 1; 976 break; 977 case IGMP_SLEEPING_MEMBER: 978 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 979 inm->inm_state = IGMP_AWAKENING_MEMBER; 980 break; 981 case IGMP_LEAVING_MEMBER: 982 break; 983 } 984 } 985 986 /* 987 * Process a received IGMPv3 general, group-specific or 988 * group-and-source-specific query. 989 * Assumes m has already been pulled up to the full IGMP message length. 990 * Return 0 if successful, otherwise an appropriate error code is returned. 991 */ 992 static int 993 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 994 /*const*/ struct igmpv3 *igmpv3) 995 { 996 struct igmp_ifsoftc *igi; 997 struct in_multi *inm; 998 int is_general_query; 999 uint32_t maxresp, nsrc, qqi; 1000 uint16_t timer; 1001 uint8_t qrv; 1002 1003 is_general_query = 0; 1004 1005 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 1006 1007 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 1008 if (maxresp >= 128) { 1009 maxresp = IGMP_MANT(igmpv3->igmp_code) << 1010 (IGMP_EXP(igmpv3->igmp_code) + 3); 1011 } 1012 1013 /* 1014 * Robustness must never be less than 2 for on-wire IGMPv3. 1015 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 1016 * an exception for interfaces whose IGMPv3 state changes 1017 * are redirected to loopback (e.g. MANET). 1018 */ 1019 qrv = IGMP_QRV(igmpv3->igmp_misc); 1020 if (qrv < 2) { 1021 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 1022 qrv, IGMP_RV_INIT); 1023 qrv = IGMP_RV_INIT; 1024 } 1025 1026 qqi = igmpv3->igmp_qqi; 1027 if (qqi >= 128) { 1028 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 1029 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 1030 } 1031 1032 timer = maxresp * IGMP_FASTHZ / IGMP_TIMER_SCALE; 1033 if (timer == 0) 1034 timer = 1; 1035 1036 nsrc = ntohs(igmpv3->igmp_numsrc); 1037 1038 /* 1039 * Validate address fields and versions upfront before 1040 * accepting v3 query. 1041 * XXX SMPng: Unlocked access to igmpstat counters here. 1042 */ 1043 if (in_nullhost(igmpv3->igmp_group)) { 1044 /* 1045 * IGMPv3 General Query. 1046 * 1047 * General Queries SHOULD be directed to 224.0.0.1. 1048 * A general query with a source list has undefined 1049 * behaviour; discard it. 1050 */ 1051 IGMPSTAT_INC(igps_rcv_gen_queries); 1052 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1053 IGMPSTAT_INC(igps_rcv_badqueries); 1054 return (0); 1055 } 1056 is_general_query = 1; 1057 } else { 1058 /* Group or group-source specific query. */ 1059 if (nsrc == 0) 1060 IGMPSTAT_INC(igps_rcv_group_queries); 1061 else 1062 IGMPSTAT_INC(igps_rcv_gsr_queries); 1063 } 1064 1065 IN_MULTI_LIST_LOCK(); 1066 IGMP_LOCK(); 1067 1068 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1069 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1070 1071 if (igi->igi_flags & IGIF_LOOPBACK) { 1072 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1073 ifp, ifp->if_xname); 1074 goto out_locked; 1075 } 1076 1077 /* 1078 * Discard the v3 query if we're in Compatibility Mode. 1079 * The RFC is not obviously worded that hosts need to stay in 1080 * compatibility mode until the Old Version Querier Present 1081 * timer expires. 1082 */ 1083 if (igi->igi_version != IGMP_VERSION_3) { 1084 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1085 igi->igi_version, ifp, ifp->if_xname); 1086 goto out_locked; 1087 } 1088 1089 igmp_set_version(igi, IGMP_VERSION_3); 1090 igi->igi_rv = qrv; 1091 igi->igi_qi = qqi; 1092 igi->igi_qri = maxresp; 1093 1094 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1095 maxresp); 1096 1097 if (is_general_query) { 1098 /* 1099 * Schedule a current-state report on this ifp for 1100 * all groups, possibly containing source lists. 1101 * If there is a pending General Query response 1102 * scheduled earlier than the selected delay, do 1103 * not schedule any other reports. 1104 * Otherwise, reset the interface timer. 1105 */ 1106 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1107 ifp, ifp->if_xname); 1108 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1109 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1110 V_interface_timers_running = 1; 1111 } 1112 } else { 1113 /* 1114 * Group-source-specific queries are throttled on 1115 * a per-group basis to defeat denial-of-service attempts. 1116 * Queries for groups we are not a member of on this 1117 * link are simply ignored. 1118 */ 1119 inm = inm_lookup(ifp, igmpv3->igmp_group); 1120 if (inm == NULL) 1121 goto out_locked; 1122 if (nsrc > 0) { 1123 if (!ratecheck(&inm->inm_lastgsrtv, 1124 &V_igmp_gsrdelay)) { 1125 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1126 __func__); 1127 IGMPSTAT_INC(igps_drop_gsr_queries); 1128 goto out_locked; 1129 } 1130 } 1131 CTR3(KTR_IGMPV3, "process v3 0x%08x query on ifp %p(%s)", 1132 ntohl(igmpv3->igmp_group.s_addr), ifp, ifp->if_xname); 1133 /* 1134 * If there is a pending General Query response 1135 * scheduled sooner than the selected delay, no 1136 * further report need be scheduled. 1137 * Otherwise, prepare to respond to the 1138 * group-specific or group-and-source query. 1139 */ 1140 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1141 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1142 } 1143 1144 out_locked: 1145 IGMP_UNLOCK(); 1146 IN_MULTI_LIST_UNLOCK(); 1147 1148 return (0); 1149 } 1150 1151 /* 1152 * Process a received IGMPv3 group-specific or group-and-source-specific 1153 * query. 1154 * Return <0 if any error occurred. Currently this is ignored. 1155 */ 1156 static int 1157 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1158 int timer, /*const*/ struct igmpv3 *igmpv3) 1159 { 1160 int retval; 1161 uint16_t nsrc; 1162 1163 IN_MULTI_LIST_LOCK_ASSERT(); 1164 IGMP_LOCK_ASSERT(); 1165 1166 retval = 0; 1167 1168 switch (inm->inm_state) { 1169 case IGMP_NOT_MEMBER: 1170 case IGMP_SILENT_MEMBER: 1171 case IGMP_SLEEPING_MEMBER: 1172 case IGMP_LAZY_MEMBER: 1173 case IGMP_AWAKENING_MEMBER: 1174 case IGMP_IDLE_MEMBER: 1175 case IGMP_LEAVING_MEMBER: 1176 return (retval); 1177 break; 1178 case IGMP_REPORTING_MEMBER: 1179 case IGMP_G_QUERY_PENDING_MEMBER: 1180 case IGMP_SG_QUERY_PENDING_MEMBER: 1181 break; 1182 } 1183 1184 nsrc = ntohs(igmpv3->igmp_numsrc); 1185 1186 /* 1187 * Deal with group-specific queries upfront. 1188 * If any group query is already pending, purge any recorded 1189 * source-list state if it exists, and schedule a query response 1190 * for this group-specific query. 1191 */ 1192 if (nsrc == 0) { 1193 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1194 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1195 inm_clear_recorded(inm); 1196 timer = min(inm->inm_timer, timer); 1197 } 1198 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1199 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1200 V_current_state_timers_running = 1; 1201 return (retval); 1202 } 1203 1204 /* 1205 * Deal with the case where a group-and-source-specific query has 1206 * been received but a group-specific query is already pending. 1207 */ 1208 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1209 timer = min(inm->inm_timer, timer); 1210 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1211 V_current_state_timers_running = 1; 1212 return (retval); 1213 } 1214 1215 /* 1216 * Finally, deal with the case where a group-and-source-specific 1217 * query has been received, where a response to a previous g-s-r 1218 * query exists, or none exists. 1219 * In this case, we need to parse the source-list which the Querier 1220 * has provided us with and check if we have any source list filter 1221 * entries at T1 for these sources. If we do not, there is no need 1222 * schedule a report and the query may be dropped. 1223 * If we do, we must record them and schedule a current-state 1224 * report for those sources. 1225 * FIXME: Handling source lists larger than 1 mbuf requires that 1226 * we pass the mbuf chain pointer down to this function, and use 1227 * m_getptr() to walk the chain. 1228 */ 1229 if (inm->inm_nsrc > 0) { 1230 const struct in_addr *ap; 1231 int i, nrecorded; 1232 1233 ap = (const struct in_addr *)(igmpv3 + 1); 1234 nrecorded = 0; 1235 for (i = 0; i < nsrc; i++, ap++) { 1236 retval = inm_record_source(inm, ap->s_addr); 1237 if (retval < 0) 1238 break; 1239 nrecorded += retval; 1240 } 1241 if (nrecorded > 0) { 1242 CTR1(KTR_IGMPV3, 1243 "%s: schedule response to SG query", __func__); 1244 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1245 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1246 V_current_state_timers_running = 1; 1247 } 1248 } 1249 1250 return (retval); 1251 } 1252 1253 /* 1254 * Process a received IGMPv1 host membership report. 1255 * 1256 * NOTE: 0.0.0.0 workaround breaks const correctness. 1257 */ 1258 static int 1259 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1260 /*const*/ struct igmp *igmp) 1261 { 1262 struct in_ifaddr *ia; 1263 struct in_multi *inm; 1264 1265 IGMPSTAT_INC(igps_rcv_reports); 1266 1267 if (ifp->if_flags & IFF_LOOPBACK) 1268 return (0); 1269 1270 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1271 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1272 IGMPSTAT_INC(igps_rcv_badreports); 1273 return (EINVAL); 1274 } 1275 1276 /* 1277 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1278 * Booting clients may use the source address 0.0.0.0. Some 1279 * IGMP daemons may not know how to use IP_RECVIF to determine 1280 * the interface upon which this message was received. 1281 * Replace 0.0.0.0 with the subnet address if told to do so. 1282 */ 1283 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1284 IFP_TO_IA(ifp, ia); 1285 if (ia != NULL) 1286 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1287 } 1288 1289 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1290 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1291 1292 /* 1293 * IGMPv1 report suppression. 1294 * If we are a member of this group, and our membership should be 1295 * reported, stop our group timer and transition to the 'lazy' state. 1296 */ 1297 IN_MULTI_LIST_LOCK(); 1298 inm = inm_lookup(ifp, igmp->igmp_group); 1299 if (inm != NULL) { 1300 struct igmp_ifsoftc *igi; 1301 1302 igi = inm->inm_igi; 1303 if (igi == NULL) { 1304 KASSERT(igi != NULL, 1305 ("%s: no igi for ifp %p", __func__, ifp)); 1306 goto out_locked; 1307 } 1308 1309 IGMPSTAT_INC(igps_rcv_ourreports); 1310 1311 /* 1312 * If we are in IGMPv3 host mode, do not allow the 1313 * other host's IGMPv1 report to suppress our reports 1314 * unless explicitly configured to do so. 1315 */ 1316 if (igi->igi_version == IGMP_VERSION_3) { 1317 if (V_igmp_legacysupp) 1318 igmp_v3_suppress_group_record(inm); 1319 goto out_locked; 1320 } 1321 1322 inm->inm_timer = 0; 1323 1324 switch (inm->inm_state) { 1325 case IGMP_NOT_MEMBER: 1326 case IGMP_SILENT_MEMBER: 1327 break; 1328 case IGMP_IDLE_MEMBER: 1329 case IGMP_LAZY_MEMBER: 1330 case IGMP_AWAKENING_MEMBER: 1331 CTR3(KTR_IGMPV3, 1332 "report suppressed for 0x%08x on ifp %p(%s)", 1333 ntohl(igmp->igmp_group.s_addr), ifp, 1334 ifp->if_xname); 1335 case IGMP_SLEEPING_MEMBER: 1336 inm->inm_state = IGMP_SLEEPING_MEMBER; 1337 break; 1338 case IGMP_REPORTING_MEMBER: 1339 CTR3(KTR_IGMPV3, 1340 "report suppressed for 0x%08x on ifp %p(%s)", 1341 ntohl(igmp->igmp_group.s_addr), ifp, 1342 ifp->if_xname); 1343 if (igi->igi_version == IGMP_VERSION_1) 1344 inm->inm_state = IGMP_LAZY_MEMBER; 1345 else if (igi->igi_version == IGMP_VERSION_2) 1346 inm->inm_state = IGMP_SLEEPING_MEMBER; 1347 break; 1348 case IGMP_G_QUERY_PENDING_MEMBER: 1349 case IGMP_SG_QUERY_PENDING_MEMBER: 1350 case IGMP_LEAVING_MEMBER: 1351 break; 1352 } 1353 } 1354 1355 out_locked: 1356 IN_MULTI_LIST_UNLOCK(); 1357 1358 return (0); 1359 } 1360 1361 /* 1362 * Process a received IGMPv2 host membership report. 1363 * 1364 * NOTE: 0.0.0.0 workaround breaks const correctness. 1365 */ 1366 static int 1367 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1368 /*const*/ struct igmp *igmp) 1369 { 1370 struct in_ifaddr *ia; 1371 struct in_multi *inm; 1372 1373 /* 1374 * Make sure we don't hear our own membership report. Fast 1375 * leave requires knowing that we are the only member of a 1376 * group. 1377 */ 1378 IFP_TO_IA(ifp, ia); 1379 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1380 return (0); 1381 } 1382 1383 IGMPSTAT_INC(igps_rcv_reports); 1384 1385 if (ifp->if_flags & IFF_LOOPBACK) { 1386 return (0); 1387 } 1388 1389 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1390 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1391 IGMPSTAT_INC(igps_rcv_badreports); 1392 return (EINVAL); 1393 } 1394 1395 /* 1396 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1397 * Booting clients may use the source address 0.0.0.0. Some 1398 * IGMP daemons may not know how to use IP_RECVIF to determine 1399 * the interface upon which this message was received. 1400 * Replace 0.0.0.0 with the subnet address if told to do so. 1401 */ 1402 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1403 if (ia != NULL) 1404 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1405 } 1406 1407 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1408 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1409 1410 /* 1411 * IGMPv2 report suppression. 1412 * If we are a member of this group, and our membership should be 1413 * reported, and our group timer is pending or about to be reset, 1414 * stop our group timer by transitioning to the 'lazy' state. 1415 */ 1416 IN_MULTI_LIST_LOCK(); 1417 inm = inm_lookup(ifp, igmp->igmp_group); 1418 if (inm != NULL) { 1419 struct igmp_ifsoftc *igi; 1420 1421 igi = inm->inm_igi; 1422 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1423 1424 IGMPSTAT_INC(igps_rcv_ourreports); 1425 1426 /* 1427 * If we are in IGMPv3 host mode, do not allow the 1428 * other host's IGMPv1 report to suppress our reports 1429 * unless explicitly configured to do so. 1430 */ 1431 if (igi->igi_version == IGMP_VERSION_3) { 1432 if (V_igmp_legacysupp) 1433 igmp_v3_suppress_group_record(inm); 1434 goto out_locked; 1435 } 1436 1437 inm->inm_timer = 0; 1438 1439 switch (inm->inm_state) { 1440 case IGMP_NOT_MEMBER: 1441 case IGMP_SILENT_MEMBER: 1442 case IGMP_SLEEPING_MEMBER: 1443 break; 1444 case IGMP_REPORTING_MEMBER: 1445 case IGMP_IDLE_MEMBER: 1446 case IGMP_AWAKENING_MEMBER: 1447 CTR3(KTR_IGMPV3, 1448 "report suppressed for 0x%08x on ifp %p(%s)", 1449 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1450 case IGMP_LAZY_MEMBER: 1451 inm->inm_state = IGMP_LAZY_MEMBER; 1452 break; 1453 case IGMP_G_QUERY_PENDING_MEMBER: 1454 case IGMP_SG_QUERY_PENDING_MEMBER: 1455 case IGMP_LEAVING_MEMBER: 1456 break; 1457 } 1458 } 1459 1460 out_locked: 1461 IN_MULTI_LIST_UNLOCK(); 1462 1463 return (0); 1464 } 1465 1466 int 1467 igmp_input(struct mbuf **mp, int *offp, int proto) 1468 { 1469 int iphlen; 1470 struct ifnet *ifp; 1471 struct igmp *igmp; 1472 struct ip *ip; 1473 struct mbuf *m; 1474 int igmplen; 1475 int minlen; 1476 int queryver; 1477 1478 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1479 1480 m = *mp; 1481 ifp = m->m_pkthdr.rcvif; 1482 *mp = NULL; 1483 1484 IGMPSTAT_INC(igps_rcv_total); 1485 1486 ip = mtod(m, struct ip *); 1487 iphlen = *offp; 1488 igmplen = ntohs(ip->ip_len) - iphlen; 1489 1490 /* 1491 * Validate lengths. 1492 */ 1493 if (igmplen < IGMP_MINLEN) { 1494 IGMPSTAT_INC(igps_rcv_tooshort); 1495 m_freem(m); 1496 return (IPPROTO_DONE); 1497 } 1498 1499 /* 1500 * Always pullup to the minimum size for v1/v2 or v3 1501 * to amortize calls to m_pullup(). 1502 */ 1503 minlen = iphlen; 1504 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1505 minlen += IGMP_V3_QUERY_MINLEN; 1506 else 1507 minlen += IGMP_MINLEN; 1508 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1509 (m = m_pullup(m, minlen)) == NULL) { 1510 IGMPSTAT_INC(igps_rcv_tooshort); 1511 return (IPPROTO_DONE); 1512 } 1513 ip = mtod(m, struct ip *); 1514 1515 /* 1516 * Validate checksum. 1517 */ 1518 m->m_data += iphlen; 1519 m->m_len -= iphlen; 1520 igmp = mtod(m, struct igmp *); 1521 if (in_cksum(m, igmplen)) { 1522 IGMPSTAT_INC(igps_rcv_badsum); 1523 m_freem(m); 1524 return (IPPROTO_DONE); 1525 } 1526 m->m_data -= iphlen; 1527 m->m_len += iphlen; 1528 1529 /* 1530 * IGMP control traffic is link-scope, and must have a TTL of 1. 1531 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1532 * probe packets may come from beyond the LAN. 1533 */ 1534 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1535 IGMPSTAT_INC(igps_rcv_badttl); 1536 m_freem(m); 1537 return (IPPROTO_DONE); 1538 } 1539 1540 switch (igmp->igmp_type) { 1541 case IGMP_HOST_MEMBERSHIP_QUERY: 1542 if (igmplen == IGMP_MINLEN) { 1543 if (igmp->igmp_code == 0) 1544 queryver = IGMP_VERSION_1; 1545 else 1546 queryver = IGMP_VERSION_2; 1547 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1548 queryver = IGMP_VERSION_3; 1549 } else { 1550 IGMPSTAT_INC(igps_rcv_tooshort); 1551 m_freem(m); 1552 return (IPPROTO_DONE); 1553 } 1554 1555 switch (queryver) { 1556 case IGMP_VERSION_1: 1557 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1558 if (!V_igmp_v1enable) 1559 break; 1560 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1561 m_freem(m); 1562 return (IPPROTO_DONE); 1563 } 1564 break; 1565 1566 case IGMP_VERSION_2: 1567 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1568 if (!V_igmp_v2enable) 1569 break; 1570 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1571 m_freem(m); 1572 return (IPPROTO_DONE); 1573 } 1574 break; 1575 1576 case IGMP_VERSION_3: { 1577 struct igmpv3 *igmpv3; 1578 uint16_t igmpv3len; 1579 uint16_t nsrc; 1580 1581 IGMPSTAT_INC(igps_rcv_v3_queries); 1582 igmpv3 = (struct igmpv3 *)igmp; 1583 /* 1584 * Validate length based on source count. 1585 */ 1586 nsrc = ntohs(igmpv3->igmp_numsrc); 1587 if (nsrc * sizeof(in_addr_t) > 1588 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1589 IGMPSTAT_INC(igps_rcv_tooshort); 1590 m_freem(m); 1591 return (IPPROTO_DONE); 1592 } 1593 /* 1594 * m_pullup() may modify m, so pullup in 1595 * this scope. 1596 */ 1597 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1598 sizeof(struct in_addr) * nsrc; 1599 if ((!M_WRITABLE(m) || 1600 m->m_len < igmpv3len) && 1601 (m = m_pullup(m, igmpv3len)) == NULL) { 1602 IGMPSTAT_INC(igps_rcv_tooshort); 1603 return (IPPROTO_DONE); 1604 } 1605 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1606 + iphlen); 1607 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1608 m_freem(m); 1609 return (IPPROTO_DONE); 1610 } 1611 } 1612 break; 1613 } 1614 break; 1615 1616 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1617 if (!V_igmp_v1enable) 1618 break; 1619 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1620 m_freem(m); 1621 return (IPPROTO_DONE); 1622 } 1623 break; 1624 1625 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1626 if (!V_igmp_v2enable) 1627 break; 1628 if (!ip_checkrouteralert(m)) 1629 IGMPSTAT_INC(igps_rcv_nora); 1630 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1631 m_freem(m); 1632 return (IPPROTO_DONE); 1633 } 1634 break; 1635 1636 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1637 /* 1638 * Hosts do not need to process IGMPv3 membership reports, 1639 * as report suppression is no longer required. 1640 */ 1641 if (!ip_checkrouteralert(m)) 1642 IGMPSTAT_INC(igps_rcv_nora); 1643 break; 1644 1645 default: 1646 break; 1647 } 1648 1649 /* 1650 * Pass all valid IGMP packets up to any process(es) listening on a 1651 * raw IGMP socket. 1652 */ 1653 *mp = m; 1654 return (rip_input(mp, offp, proto)); 1655 } 1656 1657 /* 1658 * Fast timeout handler (global). 1659 * VIMAGE: Timeout handlers are expected to service all vimages. 1660 */ 1661 static struct callout igmpfast_callout; 1662 static void 1663 igmp_fasttimo(void *arg __unused) 1664 { 1665 struct epoch_tracker et; 1666 VNET_ITERATOR_DECL(vnet_iter); 1667 1668 NET_EPOCH_ENTER(et); 1669 VNET_LIST_RLOCK_NOSLEEP(); 1670 VNET_FOREACH(vnet_iter) { 1671 CURVNET_SET(vnet_iter); 1672 igmp_fasttimo_vnet(); 1673 CURVNET_RESTORE(); 1674 } 1675 VNET_LIST_RUNLOCK_NOSLEEP(); 1676 NET_EPOCH_EXIT(et); 1677 1678 callout_reset(&igmpfast_callout, hz / IGMP_FASTHZ, igmp_fasttimo, NULL); 1679 } 1680 1681 /* 1682 * Fast timeout handler (per-vnet). 1683 * Sends are shuffled off to a netisr to deal with Giant. 1684 * 1685 * VIMAGE: Assume caller has set up our curvnet. 1686 */ 1687 static void 1688 igmp_fasttimo_vnet(void) 1689 { 1690 struct mbufq scq; /* State-change packets */ 1691 struct mbufq qrq; /* Query response packets */ 1692 struct ifnet *ifp; 1693 struct igmp_ifsoftc *igi; 1694 struct ifmultiaddr *ifma, *next; 1695 struct in_multi *inm; 1696 struct in_multi_head inm_free_tmp; 1697 int loop, uri_fasthz; 1698 1699 loop = 0; 1700 uri_fasthz = 0; 1701 1702 /* 1703 * Quick check to see if any work needs to be done, in order to 1704 * minimize the overhead of fasttimo processing. 1705 * SMPng: XXX Unlocked reads. 1706 */ 1707 if (!V_current_state_timers_running && 1708 !V_interface_timers_running && 1709 !V_state_change_timers_running) 1710 return; 1711 1712 SLIST_INIT(&inm_free_tmp); 1713 IN_MULTI_LIST_LOCK(); 1714 IGMP_LOCK(); 1715 1716 /* 1717 * IGMPv3 General Query response timer processing. 1718 */ 1719 if (V_interface_timers_running) { 1720 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1721 1722 V_interface_timers_running = 0; 1723 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1724 if (igi->igi_v3_timer == 0) { 1725 /* Do nothing. */ 1726 } else if (--igi->igi_v3_timer == 0) { 1727 igmp_v3_dispatch_general_query(igi); 1728 } else { 1729 V_interface_timers_running = 1; 1730 } 1731 } 1732 } 1733 1734 if (!V_current_state_timers_running && 1735 !V_state_change_timers_running) 1736 goto out_locked; 1737 1738 V_current_state_timers_running = 0; 1739 V_state_change_timers_running = 0; 1740 1741 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1742 1743 /* 1744 * IGMPv1/v2/v3 host report and state-change timer processing. 1745 * Note: Processing a v3 group timer may remove a node. 1746 */ 1747 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1748 ifp = igi->igi_ifp; 1749 1750 if (igi->igi_version == IGMP_VERSION_3) { 1751 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1752 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1753 IGMP_FASTHZ); 1754 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1755 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1756 } 1757 1758 IF_ADDR_WLOCK(ifp); 1759 restart: 1760 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 1761 if (ifma->ifma_addr->sa_family != AF_INET || 1762 ifma->ifma_protospec == NULL) 1763 continue; 1764 inm = (struct in_multi *)ifma->ifma_protospec; 1765 switch (igi->igi_version) { 1766 case IGMP_VERSION_1: 1767 case IGMP_VERSION_2: 1768 igmp_v1v2_process_group_timer(inm, 1769 igi->igi_version); 1770 break; 1771 case IGMP_VERSION_3: 1772 igmp_v3_process_group_timers(&inm_free_tmp, &qrq, 1773 &scq, inm, uri_fasthz); 1774 break; 1775 } 1776 if (__predict_false(ifma_restart)) { 1777 ifma_restart = false; 1778 goto restart; 1779 } 1780 } 1781 IF_ADDR_WUNLOCK(ifp); 1782 1783 if (igi->igi_version == IGMP_VERSION_3) { 1784 igmp_dispatch_queue(&qrq, 0, loop); 1785 igmp_dispatch_queue(&scq, 0, loop); 1786 1787 /* 1788 * Free the in_multi reference(s) for this 1789 * IGMP lifecycle. 1790 */ 1791 inm_release_list_deferred(&inm_free_tmp); 1792 } 1793 } 1794 1795 out_locked: 1796 IGMP_UNLOCK(); 1797 IN_MULTI_LIST_UNLOCK(); 1798 } 1799 1800 /* 1801 * Update host report group timer for IGMPv1/v2. 1802 * Will update the global pending timer flags. 1803 */ 1804 static void 1805 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1806 { 1807 int report_timer_expired; 1808 1809 IN_MULTI_LIST_LOCK_ASSERT(); 1810 IGMP_LOCK_ASSERT(); 1811 1812 if (inm->inm_timer == 0) { 1813 report_timer_expired = 0; 1814 } else if (--inm->inm_timer == 0) { 1815 report_timer_expired = 1; 1816 } else { 1817 V_current_state_timers_running = 1; 1818 return; 1819 } 1820 1821 switch (inm->inm_state) { 1822 case IGMP_NOT_MEMBER: 1823 case IGMP_SILENT_MEMBER: 1824 case IGMP_IDLE_MEMBER: 1825 case IGMP_LAZY_MEMBER: 1826 case IGMP_SLEEPING_MEMBER: 1827 case IGMP_AWAKENING_MEMBER: 1828 break; 1829 case IGMP_REPORTING_MEMBER: 1830 if (report_timer_expired) { 1831 inm->inm_state = IGMP_IDLE_MEMBER; 1832 (void)igmp_v1v2_queue_report(inm, 1833 (version == IGMP_VERSION_2) ? 1834 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1835 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1836 } 1837 break; 1838 case IGMP_G_QUERY_PENDING_MEMBER: 1839 case IGMP_SG_QUERY_PENDING_MEMBER: 1840 case IGMP_LEAVING_MEMBER: 1841 break; 1842 } 1843 } 1844 1845 /* 1846 * Update a group's timers for IGMPv3. 1847 * Will update the global pending timer flags. 1848 * Note: Unlocked read from igi. 1849 */ 1850 static void 1851 igmp_v3_process_group_timers(struct in_multi_head *inmh, 1852 struct mbufq *qrq, struct mbufq *scq, 1853 struct in_multi *inm, const int uri_fasthz) 1854 { 1855 int query_response_timer_expired; 1856 int state_change_retransmit_timer_expired; 1857 1858 IN_MULTI_LIST_LOCK_ASSERT(); 1859 IGMP_LOCK_ASSERT(); 1860 1861 query_response_timer_expired = 0; 1862 state_change_retransmit_timer_expired = 0; 1863 1864 /* 1865 * During a transition from v1/v2 compatibility mode back to v3, 1866 * a group record in REPORTING state may still have its group 1867 * timer active. This is a no-op in this function; it is easier 1868 * to deal with it here than to complicate the slow-timeout path. 1869 */ 1870 if (inm->inm_timer == 0) { 1871 query_response_timer_expired = 0; 1872 } else if (--inm->inm_timer == 0) { 1873 query_response_timer_expired = 1; 1874 } else { 1875 V_current_state_timers_running = 1; 1876 } 1877 1878 if (inm->inm_sctimer == 0) { 1879 state_change_retransmit_timer_expired = 0; 1880 } else if (--inm->inm_sctimer == 0) { 1881 state_change_retransmit_timer_expired = 1; 1882 } else { 1883 V_state_change_timers_running = 1; 1884 } 1885 1886 /* We are in fasttimo, so be quick about it. */ 1887 if (!state_change_retransmit_timer_expired && 1888 !query_response_timer_expired) 1889 return; 1890 1891 switch (inm->inm_state) { 1892 case IGMP_NOT_MEMBER: 1893 case IGMP_SILENT_MEMBER: 1894 case IGMP_SLEEPING_MEMBER: 1895 case IGMP_LAZY_MEMBER: 1896 case IGMP_AWAKENING_MEMBER: 1897 case IGMP_IDLE_MEMBER: 1898 break; 1899 case IGMP_G_QUERY_PENDING_MEMBER: 1900 case IGMP_SG_QUERY_PENDING_MEMBER: 1901 /* 1902 * Respond to a previously pending Group-Specific 1903 * or Group-and-Source-Specific query by enqueueing 1904 * the appropriate Current-State report for 1905 * immediate transmission. 1906 */ 1907 if (query_response_timer_expired) { 1908 int retval __unused; 1909 1910 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1911 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1912 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1913 __func__, retval); 1914 inm->inm_state = IGMP_REPORTING_MEMBER; 1915 /* XXX Clear recorded sources for next time. */ 1916 inm_clear_recorded(inm); 1917 } 1918 /* FALLTHROUGH */ 1919 case IGMP_REPORTING_MEMBER: 1920 case IGMP_LEAVING_MEMBER: 1921 if (state_change_retransmit_timer_expired) { 1922 /* 1923 * State-change retransmission timer fired. 1924 * If there are any further pending retransmissions, 1925 * set the global pending state-change flag, and 1926 * reset the timer. 1927 */ 1928 if (--inm->inm_scrv > 0) { 1929 inm->inm_sctimer = uri_fasthz; 1930 V_state_change_timers_running = 1; 1931 } 1932 /* 1933 * Retransmit the previously computed state-change 1934 * report. If there are no further pending 1935 * retransmissions, the mbuf queue will be consumed. 1936 * Update T0 state to T1 as we have now sent 1937 * a state-change. 1938 */ 1939 (void)igmp_v3_merge_state_changes(inm, scq); 1940 1941 inm_commit(inm); 1942 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1943 ntohl(inm->inm_addr.s_addr), 1944 inm->inm_ifp->if_xname); 1945 1946 /* 1947 * If we are leaving the group for good, make sure 1948 * we release IGMP's reference to it. 1949 * This release must be deferred using a SLIST, 1950 * as we are called from a loop which traverses 1951 * the in_ifmultiaddr TAILQ. 1952 */ 1953 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1954 inm->inm_scrv == 0) { 1955 inm->inm_state = IGMP_NOT_MEMBER; 1956 inm_rele_locked(inmh, inm); 1957 } 1958 } 1959 break; 1960 } 1961 } 1962 1963 /* 1964 * Suppress a group's pending response to a group or source/group query. 1965 * 1966 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1967 * Do NOT update ST1/ST0 as this operation merely suppresses 1968 * the currently pending group record. 1969 * Do NOT suppress the response to a general query. It is possible but 1970 * it would require adding another state or flag. 1971 */ 1972 static void 1973 igmp_v3_suppress_group_record(struct in_multi *inm) 1974 { 1975 1976 IN_MULTI_LIST_LOCK_ASSERT(); 1977 1978 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1979 ("%s: not IGMPv3 mode on link", __func__)); 1980 1981 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1982 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1983 return; 1984 1985 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1986 inm_clear_recorded(inm); 1987 1988 inm->inm_timer = 0; 1989 inm->inm_state = IGMP_REPORTING_MEMBER; 1990 } 1991 1992 /* 1993 * Switch to a different IGMP version on the given interface, 1994 * as per Section 7.2.1. 1995 */ 1996 static void 1997 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1998 { 1999 int old_version_timer; 2000 2001 IGMP_LOCK_ASSERT(); 2002 2003 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 2004 version, igi->igi_ifp, igi->igi_ifp->if_xname); 2005 2006 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 2007 /* 2008 * Compute the "Older Version Querier Present" timer as per 2009 * Section 8.12. 2010 */ 2011 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 2012 old_version_timer *= IGMP_SLOWHZ; 2013 2014 if (version == IGMP_VERSION_1) { 2015 igi->igi_v1_timer = old_version_timer; 2016 igi->igi_v2_timer = 0; 2017 } else if (version == IGMP_VERSION_2) { 2018 igi->igi_v1_timer = 0; 2019 igi->igi_v2_timer = old_version_timer; 2020 } 2021 } 2022 2023 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2024 if (igi->igi_version != IGMP_VERSION_2) { 2025 igi->igi_version = IGMP_VERSION_2; 2026 igmp_v3_cancel_link_timers(igi); 2027 } 2028 } else if (igi->igi_v1_timer > 0) { 2029 if (igi->igi_version != IGMP_VERSION_1) { 2030 igi->igi_version = IGMP_VERSION_1; 2031 igmp_v3_cancel_link_timers(igi); 2032 } 2033 } 2034 } 2035 2036 /* 2037 * Cancel pending IGMPv3 timers for the given link and all groups 2038 * joined on it; state-change, general-query, and group-query timers. 2039 * 2040 * Only ever called on a transition from v3 to Compatibility mode. Kill 2041 * the timers stone dead (this may be expensive for large N groups), they 2042 * will be restarted if Compatibility Mode deems that they must be due to 2043 * query processing. 2044 */ 2045 static void 2046 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2047 { 2048 struct ifmultiaddr *ifma, *ifmatmp; 2049 struct ifnet *ifp; 2050 struct in_multi *inm; 2051 struct in_multi_head inm_free_tmp; 2052 2053 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2054 igi->igi_ifp, igi->igi_ifp->if_xname); 2055 2056 IN_MULTI_LIST_LOCK_ASSERT(); 2057 IGMP_LOCK_ASSERT(); 2058 NET_EPOCH_ASSERT(); 2059 2060 SLIST_INIT(&inm_free_tmp); 2061 2062 /* 2063 * Stop the v3 General Query Response on this link stone dead. 2064 * If fasttimo is woken up due to V_interface_timers_running, 2065 * the flag will be cleared if there are no pending link timers. 2066 */ 2067 igi->igi_v3_timer = 0; 2068 2069 /* 2070 * Now clear the current-state and state-change report timers 2071 * for all memberships scoped to this link. 2072 */ 2073 ifp = igi->igi_ifp; 2074 IF_ADDR_WLOCK(ifp); 2075 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, ifmatmp) { 2076 if (ifma->ifma_addr->sa_family != AF_INET || 2077 ifma->ifma_protospec == NULL) 2078 continue; 2079 inm = (struct in_multi *)ifma->ifma_protospec; 2080 switch (inm->inm_state) { 2081 case IGMP_NOT_MEMBER: 2082 case IGMP_SILENT_MEMBER: 2083 case IGMP_IDLE_MEMBER: 2084 case IGMP_LAZY_MEMBER: 2085 case IGMP_SLEEPING_MEMBER: 2086 case IGMP_AWAKENING_MEMBER: 2087 /* 2088 * These states are either not relevant in v3 mode, 2089 * or are unreported. Do nothing. 2090 */ 2091 break; 2092 case IGMP_LEAVING_MEMBER: 2093 /* 2094 * If we are leaving the group and switching to 2095 * compatibility mode, we need to release the final 2096 * reference held for issuing the INCLUDE {}, and 2097 * transition to REPORTING to ensure the host leave 2098 * message is sent upstream to the old querier -- 2099 * transition to NOT would lose the leave and race. 2100 */ 2101 inm_rele_locked(&inm_free_tmp, inm); 2102 /* FALLTHROUGH */ 2103 case IGMP_G_QUERY_PENDING_MEMBER: 2104 case IGMP_SG_QUERY_PENDING_MEMBER: 2105 inm_clear_recorded(inm); 2106 /* FALLTHROUGH */ 2107 case IGMP_REPORTING_MEMBER: 2108 inm->inm_state = IGMP_REPORTING_MEMBER; 2109 break; 2110 } 2111 /* 2112 * Always clear state-change and group report timers. 2113 * Free any pending IGMPv3 state-change records. 2114 */ 2115 inm->inm_sctimer = 0; 2116 inm->inm_timer = 0; 2117 mbufq_drain(&inm->inm_scq); 2118 } 2119 IF_ADDR_WUNLOCK(ifp); 2120 2121 inm_release_list_deferred(&inm_free_tmp); 2122 } 2123 2124 /* 2125 * Update the Older Version Querier Present timers for a link. 2126 * See Section 7.2.1 of RFC 3376. 2127 */ 2128 static void 2129 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2130 { 2131 2132 IGMP_LOCK_ASSERT(); 2133 2134 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2135 /* 2136 * IGMPv1 and IGMPv2 Querier Present timers expired. 2137 * 2138 * Revert to IGMPv3. 2139 */ 2140 if (igi->igi_version != IGMP_VERSION_3) { 2141 CTR5(KTR_IGMPV3, 2142 "%s: transition from v%d -> v%d on %p(%s)", 2143 __func__, igi->igi_version, IGMP_VERSION_3, 2144 igi->igi_ifp, igi->igi_ifp->if_xname); 2145 igi->igi_version = IGMP_VERSION_3; 2146 } 2147 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2148 /* 2149 * IGMPv1 Querier Present timer expired, 2150 * IGMPv2 Querier Present timer running. 2151 * If IGMPv2 was disabled since last timeout, 2152 * revert to IGMPv3. 2153 * If IGMPv2 is enabled, revert to IGMPv2. 2154 */ 2155 if (!V_igmp_v2enable) { 2156 CTR5(KTR_IGMPV3, 2157 "%s: transition from v%d -> v%d on %p(%s)", 2158 __func__, igi->igi_version, IGMP_VERSION_3, 2159 igi->igi_ifp, igi->igi_ifp->if_xname); 2160 igi->igi_v2_timer = 0; 2161 igi->igi_version = IGMP_VERSION_3; 2162 } else { 2163 --igi->igi_v2_timer; 2164 if (igi->igi_version != IGMP_VERSION_2) { 2165 CTR5(KTR_IGMPV3, 2166 "%s: transition from v%d -> v%d on %p(%s)", 2167 __func__, igi->igi_version, IGMP_VERSION_2, 2168 igi->igi_ifp, igi->igi_ifp->if_xname); 2169 igi->igi_version = IGMP_VERSION_2; 2170 igmp_v3_cancel_link_timers(igi); 2171 } 2172 } 2173 } else if (igi->igi_v1_timer > 0) { 2174 /* 2175 * IGMPv1 Querier Present timer running. 2176 * Stop IGMPv2 timer if running. 2177 * 2178 * If IGMPv1 was disabled since last timeout, 2179 * revert to IGMPv3. 2180 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2181 */ 2182 if (!V_igmp_v1enable) { 2183 CTR5(KTR_IGMPV3, 2184 "%s: transition from v%d -> v%d on %p(%s)", 2185 __func__, igi->igi_version, IGMP_VERSION_3, 2186 igi->igi_ifp, igi->igi_ifp->if_xname); 2187 igi->igi_v1_timer = 0; 2188 igi->igi_version = IGMP_VERSION_3; 2189 } else { 2190 --igi->igi_v1_timer; 2191 } 2192 if (igi->igi_v2_timer > 0) { 2193 CTR3(KTR_IGMPV3, 2194 "%s: cancel v2 timer on %p(%s)", 2195 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2196 igi->igi_v2_timer = 0; 2197 } 2198 } 2199 } 2200 2201 /* 2202 * Global slowtimo handler. 2203 * VIMAGE: Timeout handlers are expected to service all vimages. 2204 */ 2205 static struct callout igmpslow_callout; 2206 static void 2207 igmp_slowtimo(void *arg __unused) 2208 { 2209 struct epoch_tracker et; 2210 VNET_ITERATOR_DECL(vnet_iter); 2211 2212 NET_EPOCH_ENTER(et); 2213 VNET_LIST_RLOCK_NOSLEEP(); 2214 VNET_FOREACH(vnet_iter) { 2215 CURVNET_SET(vnet_iter); 2216 igmp_slowtimo_vnet(); 2217 CURVNET_RESTORE(); 2218 } 2219 VNET_LIST_RUNLOCK_NOSLEEP(); 2220 NET_EPOCH_EXIT(et); 2221 2222 callout_reset(&igmpslow_callout, hz / IGMP_SLOWHZ, igmp_slowtimo, NULL); 2223 } 2224 2225 /* 2226 * Per-vnet slowtimo handler. 2227 */ 2228 static void 2229 igmp_slowtimo_vnet(void) 2230 { 2231 struct igmp_ifsoftc *igi; 2232 2233 IGMP_LOCK(); 2234 2235 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2236 igmp_v1v2_process_querier_timers(igi); 2237 } 2238 2239 IGMP_UNLOCK(); 2240 } 2241 2242 /* 2243 * Dispatch an IGMPv1/v2 host report or leave message. 2244 * These are always small enough to fit inside a single mbuf. 2245 */ 2246 static int 2247 igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2248 { 2249 struct epoch_tracker et; 2250 struct ifnet *ifp; 2251 struct igmp *igmp; 2252 struct ip *ip; 2253 struct mbuf *m; 2254 2255 IN_MULTI_LIST_LOCK_ASSERT(); 2256 IGMP_LOCK_ASSERT(); 2257 2258 ifp = inm->inm_ifp; 2259 2260 m = m_gethdr(M_NOWAIT, MT_DATA); 2261 if (m == NULL) 2262 return (ENOMEM); 2263 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2264 2265 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2266 2267 m->m_data += sizeof(struct ip); 2268 m->m_len = sizeof(struct igmp); 2269 2270 igmp = mtod(m, struct igmp *); 2271 igmp->igmp_type = type; 2272 igmp->igmp_code = 0; 2273 igmp->igmp_group = inm->inm_addr; 2274 igmp->igmp_cksum = 0; 2275 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2276 2277 m->m_data -= sizeof(struct ip); 2278 m->m_len += sizeof(struct ip); 2279 2280 ip = mtod(m, struct ip *); 2281 ip->ip_tos = 0; 2282 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2283 ip->ip_off = 0; 2284 ip->ip_p = IPPROTO_IGMP; 2285 ip->ip_src.s_addr = INADDR_ANY; 2286 2287 if (type == IGMP_HOST_LEAVE_MESSAGE) 2288 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2289 else 2290 ip->ip_dst = inm->inm_addr; 2291 2292 igmp_save_context(m, ifp); 2293 2294 m->m_flags |= M_IGMPV2; 2295 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2296 m->m_flags |= M_IGMP_LOOP; 2297 2298 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2299 NET_EPOCH_ENTER(et); 2300 netisr_dispatch(NETISR_IGMP, m); 2301 NET_EPOCH_EXIT(et); 2302 2303 return (0); 2304 } 2305 2306 /* 2307 * Process a state change from the upper layer for the given IPv4 group. 2308 * 2309 * Each socket holds a reference on the in_multi in its own ip_moptions. 2310 * The socket layer will have made the necessary updates to.the group 2311 * state, it is now up to IGMP to issue a state change report if there 2312 * has been any change between T0 (when the last state-change was issued) 2313 * and T1 (now). 2314 * 2315 * We use the IGMPv3 state machine at group level. The IGMP module 2316 * however makes the decision as to which IGMP protocol version to speak. 2317 * A state change *from* INCLUDE {} always means an initial join. 2318 * A state change *to* INCLUDE {} always means a final leave. 2319 * 2320 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2321 * save ourselves a bunch of work; any exclusive mode groups need not 2322 * compute source filter lists. 2323 * 2324 * VIMAGE: curvnet should have been set by caller, as this routine 2325 * is called from the socket option handlers. 2326 */ 2327 int 2328 igmp_change_state(struct in_multi *inm) 2329 { 2330 struct igmp_ifsoftc *igi; 2331 struct ifnet *ifp; 2332 int error; 2333 2334 error = 0; 2335 IN_MULTI_LOCK_ASSERT(); 2336 /* 2337 * Try to detect if the upper layer just asked us to change state 2338 * for an interface which has now gone away. 2339 */ 2340 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2341 ifp = inm->inm_ifma->ifma_ifp; 2342 /* 2343 * Sanity check that netinet's notion of ifp is the 2344 * same as net's. 2345 */ 2346 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2347 2348 IGMP_LOCK(); 2349 2350 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2351 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2352 2353 /* 2354 * If we detect a state transition to or from MCAST_UNDEFINED 2355 * for this group, then we are starting or finishing an IGMP 2356 * life cycle for this group. 2357 */ 2358 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2359 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2360 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2361 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2362 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2363 error = igmp_initial_join(inm, igi); 2364 goto out_locked; 2365 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2366 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2367 igmp_final_leave(inm, igi); 2368 goto out_locked; 2369 } 2370 } else { 2371 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2372 } 2373 2374 error = igmp_handle_state_change(inm, igi); 2375 2376 out_locked: 2377 IGMP_UNLOCK(); 2378 return (error); 2379 } 2380 2381 /* 2382 * Perform the initial join for an IGMP group. 2383 * 2384 * When joining a group: 2385 * If the group should have its IGMP traffic suppressed, do nothing. 2386 * IGMPv1 starts sending IGMPv1 host membership reports. 2387 * IGMPv2 starts sending IGMPv2 host membership reports. 2388 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2389 * initial state of the membership. 2390 */ 2391 static int 2392 igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2393 { 2394 struct ifnet *ifp; 2395 struct mbufq *mq; 2396 int error, retval, syncstates; 2397 2398 CTR4(KTR_IGMPV3, "%s: initial join 0x%08x on ifp %p(%s)", __func__, 2399 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2400 2401 error = 0; 2402 syncstates = 1; 2403 2404 ifp = inm->inm_ifp; 2405 2406 IN_MULTI_LOCK_ASSERT(); 2407 IGMP_LOCK_ASSERT(); 2408 2409 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2410 2411 /* 2412 * Groups joined on loopback or marked as 'not reported', 2413 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2414 * are never reported in any IGMP protocol exchanges. 2415 * All other groups enter the appropriate IGMP state machine 2416 * for the version in use on this link. 2417 * A link marked as IGIF_SILENT causes IGMP to be completely 2418 * disabled for the link. 2419 */ 2420 if ((ifp->if_flags & IFF_LOOPBACK) || 2421 (igi->igi_flags & IGIF_SILENT) || 2422 !igmp_isgroupreported(inm->inm_addr)) { 2423 CTR1(KTR_IGMPV3, 2424 "%s: not kicking state machine for silent group", __func__); 2425 inm->inm_state = IGMP_SILENT_MEMBER; 2426 inm->inm_timer = 0; 2427 } else { 2428 /* 2429 * Deal with overlapping in_multi lifecycle. 2430 * If this group was LEAVING, then make sure 2431 * we drop the reference we picked up to keep the 2432 * group around for the final INCLUDE {} enqueue. 2433 */ 2434 if (igi->igi_version == IGMP_VERSION_3 && 2435 inm->inm_state == IGMP_LEAVING_MEMBER) { 2436 MPASS(inm->inm_refcount > 1); 2437 inm_rele_locked(NULL, inm); 2438 } 2439 inm->inm_state = IGMP_REPORTING_MEMBER; 2440 2441 switch (igi->igi_version) { 2442 case IGMP_VERSION_1: 2443 case IGMP_VERSION_2: 2444 inm->inm_state = IGMP_IDLE_MEMBER; 2445 error = igmp_v1v2_queue_report(inm, 2446 (igi->igi_version == IGMP_VERSION_2) ? 2447 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2448 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2449 if (error == 0) { 2450 inm->inm_timer = IGMP_RANDOM_DELAY( 2451 IGMP_V1V2_MAX_RI * IGMP_FASTHZ); 2452 V_current_state_timers_running = 1; 2453 } 2454 break; 2455 2456 case IGMP_VERSION_3: 2457 /* 2458 * Defer update of T0 to T1, until the first copy 2459 * of the state change has been transmitted. 2460 */ 2461 syncstates = 0; 2462 2463 /* 2464 * Immediately enqueue a State-Change Report for 2465 * this interface, freeing any previous reports. 2466 * Don't kick the timers if there is nothing to do, 2467 * or if an error occurred. 2468 */ 2469 mq = &inm->inm_scq; 2470 mbufq_drain(mq); 2471 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2472 0, 0); 2473 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2474 __func__, retval); 2475 if (retval <= 0) { 2476 error = retval * -1; 2477 break; 2478 } 2479 2480 /* 2481 * Schedule transmission of pending state-change 2482 * report up to RV times for this link. The timer 2483 * will fire at the next igmp_fasttimo (~200ms), 2484 * giving us an opportunity to merge the reports. 2485 */ 2486 if (igi->igi_flags & IGIF_LOOPBACK) { 2487 inm->inm_scrv = 1; 2488 } else { 2489 KASSERT(igi->igi_rv > 1, 2490 ("%s: invalid robustness %d", __func__, 2491 igi->igi_rv)); 2492 inm->inm_scrv = igi->igi_rv; 2493 } 2494 inm->inm_sctimer = 1; 2495 V_state_change_timers_running = 1; 2496 2497 error = 0; 2498 break; 2499 } 2500 } 2501 2502 /* 2503 * Only update the T0 state if state change is atomic, 2504 * i.e. we don't need to wait for a timer to fire before we 2505 * can consider the state change to have been communicated. 2506 */ 2507 if (syncstates) { 2508 inm_commit(inm); 2509 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2510 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2511 } 2512 2513 return (error); 2514 } 2515 2516 /* 2517 * Issue an intermediate state change during the IGMP life-cycle. 2518 */ 2519 static int 2520 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2521 { 2522 struct ifnet *ifp; 2523 int retval; 2524 2525 CTR4(KTR_IGMPV3, "%s: state change for 0x%08x on ifp %p(%s)", __func__, 2526 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2527 2528 ifp = inm->inm_ifp; 2529 2530 IN_MULTI_LIST_LOCK_ASSERT(); 2531 IGMP_LOCK_ASSERT(); 2532 2533 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2534 2535 if ((ifp->if_flags & IFF_LOOPBACK) || 2536 (igi->igi_flags & IGIF_SILENT) || 2537 !igmp_isgroupreported(inm->inm_addr) || 2538 (igi->igi_version != IGMP_VERSION_3)) { 2539 if (!igmp_isgroupreported(inm->inm_addr)) { 2540 CTR1(KTR_IGMPV3, 2541 "%s: not kicking state machine for silent group", __func__); 2542 } 2543 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2544 inm_commit(inm); 2545 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2546 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2547 return (0); 2548 } 2549 2550 mbufq_drain(&inm->inm_scq); 2551 2552 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2553 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2554 if (retval <= 0) 2555 return (-retval); 2556 2557 /* 2558 * If record(s) were enqueued, start the state-change 2559 * report timer for this group. 2560 */ 2561 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2562 inm->inm_sctimer = 1; 2563 V_state_change_timers_running = 1; 2564 2565 return (0); 2566 } 2567 2568 /* 2569 * Perform the final leave for an IGMP group. 2570 * 2571 * When leaving a group: 2572 * IGMPv1 does nothing. 2573 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2574 * IGMPv3 enqueues a state-change report containing a transition 2575 * to INCLUDE {} for immediate transmission. 2576 */ 2577 static void 2578 igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2579 { 2580 int syncstates; 2581 2582 syncstates = 1; 2583 2584 CTR4(KTR_IGMPV3, "%s: final leave 0x%08x on ifp %p(%s)", 2585 __func__, ntohl(inm->inm_addr.s_addr), inm->inm_ifp, 2586 inm->inm_ifp->if_xname); 2587 2588 IN_MULTI_LIST_LOCK_ASSERT(); 2589 IGMP_LOCK_ASSERT(); 2590 2591 switch (inm->inm_state) { 2592 case IGMP_NOT_MEMBER: 2593 case IGMP_SILENT_MEMBER: 2594 case IGMP_LEAVING_MEMBER: 2595 /* Already leaving or left; do nothing. */ 2596 CTR1(KTR_IGMPV3, 2597 "%s: not kicking state machine for silent group", __func__); 2598 break; 2599 case IGMP_REPORTING_MEMBER: 2600 case IGMP_IDLE_MEMBER: 2601 case IGMP_G_QUERY_PENDING_MEMBER: 2602 case IGMP_SG_QUERY_PENDING_MEMBER: 2603 if (igi->igi_version == IGMP_VERSION_2) { 2604 #ifdef INVARIANTS 2605 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2606 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2607 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2608 __func__); 2609 #endif 2610 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2611 inm->inm_state = IGMP_NOT_MEMBER; 2612 } else if (igi->igi_version == IGMP_VERSION_3) { 2613 /* 2614 * Stop group timer and all pending reports. 2615 * Immediately enqueue a state-change report 2616 * TO_IN {} to be sent on the next fast timeout, 2617 * giving us an opportunity to merge reports. 2618 */ 2619 mbufq_drain(&inm->inm_scq); 2620 inm->inm_timer = 0; 2621 if (igi->igi_flags & IGIF_LOOPBACK) { 2622 inm->inm_scrv = 1; 2623 } else { 2624 inm->inm_scrv = igi->igi_rv; 2625 } 2626 CTR4(KTR_IGMPV3, "%s: Leaving 0x%08x/%s with %d " 2627 "pending retransmissions.", __func__, 2628 ntohl(inm->inm_addr.s_addr), 2629 inm->inm_ifp->if_xname, inm->inm_scrv); 2630 if (inm->inm_scrv == 0) { 2631 inm->inm_state = IGMP_NOT_MEMBER; 2632 inm->inm_sctimer = 0; 2633 } else { 2634 int retval __unused; 2635 2636 inm_acquire_locked(inm); 2637 2638 retval = igmp_v3_enqueue_group_record( 2639 &inm->inm_scq, inm, 1, 0, 0); 2640 KASSERT(retval != 0, 2641 ("%s: enqueue record = %d", __func__, 2642 retval)); 2643 2644 inm->inm_state = IGMP_LEAVING_MEMBER; 2645 inm->inm_sctimer = 1; 2646 V_state_change_timers_running = 1; 2647 syncstates = 0; 2648 } 2649 break; 2650 } 2651 break; 2652 case IGMP_LAZY_MEMBER: 2653 case IGMP_SLEEPING_MEMBER: 2654 case IGMP_AWAKENING_MEMBER: 2655 /* Our reports are suppressed; do nothing. */ 2656 break; 2657 } 2658 2659 if (syncstates) { 2660 inm_commit(inm); 2661 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2662 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2663 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2664 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for 0x%08x/%s", 2665 __func__, ntohl(inm->inm_addr.s_addr), 2666 inm->inm_ifp->if_xname); 2667 } 2668 } 2669 2670 /* 2671 * Enqueue an IGMPv3 group record to the given output queue. 2672 * 2673 * XXX This function could do with having the allocation code 2674 * split out, and the multiple-tree-walks coalesced into a single 2675 * routine as has been done in igmp_v3_enqueue_filter_change(). 2676 * 2677 * If is_state_change is zero, a current-state record is appended. 2678 * If is_state_change is non-zero, a state-change report is appended. 2679 * 2680 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2681 * If is_group_query is zero, and if there is a packet with free space 2682 * at the tail of the queue, it will be appended to providing there 2683 * is enough free space. 2684 * Otherwise a new mbuf packet chain is allocated. 2685 * 2686 * If is_source_query is non-zero, each source is checked to see if 2687 * it was recorded for a Group-Source query, and will be omitted if 2688 * it is not both in-mode and recorded. 2689 * 2690 * The function will attempt to allocate leading space in the packet 2691 * for the IP/IGMP header to be prepended without fragmenting the chain. 2692 * 2693 * If successful the size of all data appended to the queue is returned, 2694 * otherwise an error code less than zero is returned, or zero if 2695 * no record(s) were appended. 2696 */ 2697 static int 2698 igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2699 const int is_state_change, const int is_group_query, 2700 const int is_source_query) 2701 { 2702 struct igmp_grouprec ig; 2703 struct igmp_grouprec *pig; 2704 struct ifnet *ifp; 2705 struct ip_msource *ims, *nims; 2706 struct mbuf *m0, *m, *md; 2707 int is_filter_list_change; 2708 int minrec0len, m0srcs, msrcs, nbytes, off; 2709 int record_has_sources; 2710 int now; 2711 int type; 2712 in_addr_t naddr; 2713 uint8_t mode; 2714 2715 IN_MULTI_LIST_LOCK_ASSERT(); 2716 2717 ifp = inm->inm_ifp; 2718 is_filter_list_change = 0; 2719 m = NULL; 2720 m0 = NULL; 2721 m0srcs = 0; 2722 msrcs = 0; 2723 nbytes = 0; 2724 nims = NULL; 2725 record_has_sources = 1; 2726 pig = NULL; 2727 type = IGMP_DO_NOTHING; 2728 mode = inm->inm_st[1].iss_fmode; 2729 2730 /* 2731 * If we did not transition out of ASM mode during t0->t1, 2732 * and there are no source nodes to process, we can skip 2733 * the generation of source records. 2734 */ 2735 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2736 inm->inm_nsrc == 0) 2737 record_has_sources = 0; 2738 2739 if (is_state_change) { 2740 /* 2741 * Queue a state change record. 2742 * If the mode did not change, and there are non-ASM 2743 * listeners or source filters present, 2744 * we potentially need to issue two records for the group. 2745 * If we are transitioning to MCAST_UNDEFINED, we need 2746 * not send any sources. 2747 * If there are ASM listeners, and there was no filter 2748 * mode transition of any kind, do nothing. 2749 */ 2750 if (mode != inm->inm_st[0].iss_fmode) { 2751 if (mode == MCAST_EXCLUDE) { 2752 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2753 __func__); 2754 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2755 } else { 2756 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2757 __func__); 2758 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2759 if (mode == MCAST_UNDEFINED) 2760 record_has_sources = 0; 2761 } 2762 } else { 2763 if (record_has_sources) { 2764 is_filter_list_change = 1; 2765 } else { 2766 type = IGMP_DO_NOTHING; 2767 } 2768 } 2769 } else { 2770 /* 2771 * Queue a current state record. 2772 */ 2773 if (mode == MCAST_EXCLUDE) { 2774 type = IGMP_MODE_IS_EXCLUDE; 2775 } else if (mode == MCAST_INCLUDE) { 2776 type = IGMP_MODE_IS_INCLUDE; 2777 KASSERT(inm->inm_st[1].iss_asm == 0, 2778 ("%s: inm %p is INCLUDE but ASM count is %d", 2779 __func__, inm, inm->inm_st[1].iss_asm)); 2780 } 2781 } 2782 2783 /* 2784 * Generate the filter list changes using a separate function. 2785 */ 2786 if (is_filter_list_change) 2787 return (igmp_v3_enqueue_filter_change(mq, inm)); 2788 2789 if (type == IGMP_DO_NOTHING) { 2790 CTR3(KTR_IGMPV3, "%s: nothing to do for 0x%08x/%s", __func__, 2791 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2792 return (0); 2793 } 2794 2795 /* 2796 * If any sources are present, we must be able to fit at least 2797 * one in the trailing space of the tail packet's mbuf, 2798 * ideally more. 2799 */ 2800 minrec0len = sizeof(struct igmp_grouprec); 2801 if (record_has_sources) 2802 minrec0len += sizeof(in_addr_t); 2803 2804 CTR4(KTR_IGMPV3, "%s: queueing %s for 0x%08x/%s", __func__, 2805 igmp_rec_type_to_str(type), ntohl(inm->inm_addr.s_addr), 2806 inm->inm_ifp->if_xname); 2807 2808 /* 2809 * Check if we have a packet in the tail of the queue for this 2810 * group into which the first group record for this group will fit. 2811 * Otherwise allocate a new packet. 2812 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2813 * Note: Group records for G/GSR query responses MUST be sent 2814 * in their own packet. 2815 */ 2816 m0 = mbufq_last(mq); 2817 if (!is_group_query && 2818 m0 != NULL && 2819 (m0->m_pkthdr.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2820 (m0->m_pkthdr.len + minrec0len) < 2821 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2822 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2823 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2824 m = m0; 2825 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2826 } else { 2827 if (mbufq_full(mq)) { 2828 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2829 return (-ENOMEM); 2830 } 2831 m = NULL; 2832 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2833 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2834 if (!is_state_change && !is_group_query) { 2835 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2836 if (m) 2837 m->m_data += IGMP_LEADINGSPACE; 2838 } 2839 if (m == NULL) { 2840 m = m_gethdr(M_NOWAIT, MT_DATA); 2841 if (m) 2842 M_ALIGN(m, IGMP_LEADINGSPACE); 2843 } 2844 if (m == NULL) 2845 return (-ENOMEM); 2846 2847 igmp_save_context(m, ifp); 2848 2849 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2850 } 2851 2852 /* 2853 * Append group record. 2854 * If we have sources, we don't know how many yet. 2855 */ 2856 ig.ig_type = type; 2857 ig.ig_datalen = 0; 2858 ig.ig_numsrc = 0; 2859 ig.ig_group = inm->inm_addr; 2860 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2861 if (m != m0) 2862 m_freem(m); 2863 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2864 return (-ENOMEM); 2865 } 2866 nbytes += sizeof(struct igmp_grouprec); 2867 2868 /* 2869 * Append as many sources as will fit in the first packet. 2870 * If we are appending to a new packet, the chain allocation 2871 * may potentially use clusters; use m_getptr() in this case. 2872 * If we are appending to an existing packet, we need to obtain 2873 * a pointer to the group record after m_append(), in case a new 2874 * mbuf was allocated. 2875 * Only append sources which are in-mode at t1. If we are 2876 * transitioning to MCAST_UNDEFINED state on the group, do not 2877 * include source entries. 2878 * Only report recorded sources in our filter set when responding 2879 * to a group-source query. 2880 */ 2881 if (record_has_sources) { 2882 if (m == m0) { 2883 md = m_last(m); 2884 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2885 md->m_len - nbytes); 2886 } else { 2887 md = m_getptr(m, 0, &off); 2888 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2889 off); 2890 } 2891 msrcs = 0; 2892 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2893 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2894 ims->ims_haddr); 2895 now = ims_get_mode(inm, ims, 1); 2896 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2897 if ((now != mode) || 2898 (now == mode && mode == MCAST_UNDEFINED)) { 2899 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2900 continue; 2901 } 2902 if (is_source_query && ims->ims_stp == 0) { 2903 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2904 __func__); 2905 continue; 2906 } 2907 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2908 naddr = htonl(ims->ims_haddr); 2909 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2910 if (m != m0) 2911 m_freem(m); 2912 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2913 __func__); 2914 return (-ENOMEM); 2915 } 2916 nbytes += sizeof(in_addr_t); 2917 ++msrcs; 2918 if (msrcs == m0srcs) 2919 break; 2920 } 2921 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2922 msrcs); 2923 pig->ig_numsrc = htons(msrcs); 2924 nbytes += (msrcs * sizeof(in_addr_t)); 2925 } 2926 2927 if (is_source_query && msrcs == 0) { 2928 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2929 if (m != m0) 2930 m_freem(m); 2931 return (0); 2932 } 2933 2934 /* 2935 * We are good to go with first packet. 2936 */ 2937 if (m != m0) { 2938 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2939 m->m_pkthdr.vt_nrecs = 1; 2940 mbufq_enqueue(mq, m); 2941 } else 2942 m->m_pkthdr.vt_nrecs++; 2943 2944 /* 2945 * No further work needed if no source list in packet(s). 2946 */ 2947 if (!record_has_sources) 2948 return (nbytes); 2949 2950 /* 2951 * Whilst sources remain to be announced, we need to allocate 2952 * a new packet and fill out as many sources as will fit. 2953 * Always try for a cluster first. 2954 */ 2955 while (nims != NULL) { 2956 if (mbufq_full(mq)) { 2957 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2958 return (-ENOMEM); 2959 } 2960 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2961 if (m) 2962 m->m_data += IGMP_LEADINGSPACE; 2963 if (m == NULL) { 2964 m = m_gethdr(M_NOWAIT, MT_DATA); 2965 if (m) 2966 M_ALIGN(m, IGMP_LEADINGSPACE); 2967 } 2968 if (m == NULL) 2969 return (-ENOMEM); 2970 igmp_save_context(m, ifp); 2971 md = m_getptr(m, 0, &off); 2972 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2973 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2974 2975 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2976 if (m != m0) 2977 m_freem(m); 2978 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2979 return (-ENOMEM); 2980 } 2981 m->m_pkthdr.vt_nrecs = 1; 2982 nbytes += sizeof(struct igmp_grouprec); 2983 2984 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2985 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2986 2987 msrcs = 0; 2988 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2989 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2990 ims->ims_haddr); 2991 now = ims_get_mode(inm, ims, 1); 2992 if ((now != mode) || 2993 (now == mode && mode == MCAST_UNDEFINED)) { 2994 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2995 continue; 2996 } 2997 if (is_source_query && ims->ims_stp == 0) { 2998 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2999 __func__); 3000 continue; 3001 } 3002 CTR1(KTR_IGMPV3, "%s: append node", __func__); 3003 naddr = htonl(ims->ims_haddr); 3004 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 3005 if (m != m0) 3006 m_freem(m); 3007 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 3008 __func__); 3009 return (-ENOMEM); 3010 } 3011 ++msrcs; 3012 if (msrcs == m0srcs) 3013 break; 3014 } 3015 pig->ig_numsrc = htons(msrcs); 3016 nbytes += (msrcs * sizeof(in_addr_t)); 3017 3018 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 3019 mbufq_enqueue(mq, m); 3020 } 3021 3022 return (nbytes); 3023 } 3024 3025 /* 3026 * Type used to mark record pass completion. 3027 * We exploit the fact we can cast to this easily from the 3028 * current filter modes on each ip_msource node. 3029 */ 3030 typedef enum { 3031 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 3032 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 3033 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 3034 REC_FULL = REC_ALLOW | REC_BLOCK 3035 } rectype_t; 3036 3037 /* 3038 * Enqueue an IGMPv3 filter list change to the given output queue. 3039 * 3040 * Source list filter state is held in an RB-tree. When the filter list 3041 * for a group is changed without changing its mode, we need to compute 3042 * the deltas between T0 and T1 for each source in the filter set, 3043 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 3044 * 3045 * As we may potentially queue two record types, and the entire R-B tree 3046 * needs to be walked at once, we break this out into its own function 3047 * so we can generate a tightly packed queue of packets. 3048 * 3049 * XXX This could be written to only use one tree walk, although that makes 3050 * serializing into the mbuf chains a bit harder. For now we do two walks 3051 * which makes things easier on us, and it may or may not be harder on 3052 * the L2 cache. 3053 * 3054 * If successful the size of all data appended to the queue is returned, 3055 * otherwise an error code less than zero is returned, or zero if 3056 * no record(s) were appended. 3057 */ 3058 static int 3059 igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3060 { 3061 static const int MINRECLEN = 3062 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3063 struct ifnet *ifp; 3064 struct igmp_grouprec ig; 3065 struct igmp_grouprec *pig; 3066 struct ip_msource *ims, *nims; 3067 struct mbuf *m, *m0, *md; 3068 in_addr_t naddr; 3069 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3070 #ifdef KTR 3071 int nallow, nblock; 3072 #endif 3073 uint8_t mode, now, then; 3074 rectype_t crt, drt, nrt; 3075 3076 IN_MULTI_LIST_LOCK_ASSERT(); 3077 3078 if (inm->inm_nsrc == 0 || 3079 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3080 return (0); 3081 3082 ifp = inm->inm_ifp; /* interface */ 3083 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3084 crt = REC_NONE; /* current group record type */ 3085 drt = REC_NONE; /* mask of completed group record types */ 3086 nrt = REC_NONE; /* record type for current node */ 3087 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3088 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3089 npbytes = 0; /* # of bytes appended this packet */ 3090 rsrcs = 0; /* # sources encoded in current record */ 3091 schanged = 0; /* # nodes encoded in overall filter change */ 3092 #ifdef KTR 3093 nallow = 0; /* # of source entries in ALLOW_NEW */ 3094 nblock = 0; /* # of source entries in BLOCK_OLD */ 3095 #endif 3096 nims = NULL; /* next tree node pointer */ 3097 3098 /* 3099 * For each possible filter record mode. 3100 * The first kind of source we encounter tells us which 3101 * is the first kind of record we start appending. 3102 * If a node transitioned to UNDEFINED at t1, its mode is treated 3103 * as the inverse of the group's filter mode. 3104 */ 3105 while (drt != REC_FULL) { 3106 do { 3107 m0 = mbufq_last(mq); 3108 if (m0 != NULL && 3109 (m0->m_pkthdr.vt_nrecs + 1 <= 3110 IGMP_V3_REPORT_MAXRECS) && 3111 (m0->m_pkthdr.len + MINRECLEN) < 3112 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3113 m = m0; 3114 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3115 sizeof(struct igmp_grouprec)) / 3116 sizeof(in_addr_t); 3117 CTR1(KTR_IGMPV3, 3118 "%s: use previous packet", __func__); 3119 } else { 3120 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3121 if (m) 3122 m->m_data += IGMP_LEADINGSPACE; 3123 if (m == NULL) { 3124 m = m_gethdr(M_NOWAIT, MT_DATA); 3125 if (m) 3126 M_ALIGN(m, IGMP_LEADINGSPACE); 3127 } 3128 if (m == NULL) { 3129 CTR1(KTR_IGMPV3, 3130 "%s: m_get*() failed", __func__); 3131 return (-ENOMEM); 3132 } 3133 m->m_pkthdr.vt_nrecs = 0; 3134 igmp_save_context(m, ifp); 3135 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3136 sizeof(struct igmp_grouprec)) / 3137 sizeof(in_addr_t); 3138 npbytes = 0; 3139 CTR1(KTR_IGMPV3, 3140 "%s: allocated new packet", __func__); 3141 } 3142 /* 3143 * Append the IGMP group record header to the 3144 * current packet's data area. 3145 * Recalculate pointer to free space for next 3146 * group record, in case m_append() allocated 3147 * a new mbuf or cluster. 3148 */ 3149 memset(&ig, 0, sizeof(ig)); 3150 ig.ig_group = inm->inm_addr; 3151 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3152 if (m != m0) 3153 m_freem(m); 3154 CTR1(KTR_IGMPV3, 3155 "%s: m_append() failed", __func__); 3156 return (-ENOMEM); 3157 } 3158 npbytes += sizeof(struct igmp_grouprec); 3159 if (m != m0) { 3160 /* new packet; offset in c hain */ 3161 md = m_getptr(m, npbytes - 3162 sizeof(struct igmp_grouprec), &off); 3163 pig = (struct igmp_grouprec *)(mtod(md, 3164 uint8_t *) + off); 3165 } else { 3166 /* current packet; offset from last append */ 3167 md = m_last(m); 3168 pig = (struct igmp_grouprec *)(mtod(md, 3169 uint8_t *) + md->m_len - 3170 sizeof(struct igmp_grouprec)); 3171 } 3172 /* 3173 * Begin walking the tree for this record type 3174 * pass, or continue from where we left off 3175 * previously if we had to allocate a new packet. 3176 * Only report deltas in-mode at t1. 3177 * We need not report included sources as allowed 3178 * if we are in inclusive mode on the group, 3179 * however the converse is not true. 3180 */ 3181 rsrcs = 0; 3182 if (nims == NULL) 3183 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3184 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3185 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", 3186 __func__, ims->ims_haddr); 3187 now = ims_get_mode(inm, ims, 1); 3188 then = ims_get_mode(inm, ims, 0); 3189 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3190 __func__, then, now); 3191 if (now == then) { 3192 CTR1(KTR_IGMPV3, 3193 "%s: skip unchanged", __func__); 3194 continue; 3195 } 3196 if (mode == MCAST_EXCLUDE && 3197 now == MCAST_INCLUDE) { 3198 CTR1(KTR_IGMPV3, 3199 "%s: skip IN src on EX group", 3200 __func__); 3201 continue; 3202 } 3203 nrt = (rectype_t)now; 3204 if (nrt == REC_NONE) 3205 nrt = (rectype_t)(~mode & REC_FULL); 3206 if (schanged++ == 0) { 3207 crt = nrt; 3208 } else if (crt != nrt) 3209 continue; 3210 naddr = htonl(ims->ims_haddr); 3211 if (!m_append(m, sizeof(in_addr_t), 3212 (void *)&naddr)) { 3213 if (m != m0) 3214 m_freem(m); 3215 CTR1(KTR_IGMPV3, 3216 "%s: m_append() failed", __func__); 3217 return (-ENOMEM); 3218 } 3219 #ifdef KTR 3220 nallow += !!(crt == REC_ALLOW); 3221 nblock += !!(crt == REC_BLOCK); 3222 #endif 3223 if (++rsrcs == m0srcs) 3224 break; 3225 } 3226 /* 3227 * If we did not append any tree nodes on this 3228 * pass, back out of allocations. 3229 */ 3230 if (rsrcs == 0) { 3231 npbytes -= sizeof(struct igmp_grouprec); 3232 if (m != m0) { 3233 CTR1(KTR_IGMPV3, 3234 "%s: m_free(m)", __func__); 3235 m_freem(m); 3236 } else { 3237 CTR1(KTR_IGMPV3, 3238 "%s: m_adj(m, -ig)", __func__); 3239 m_adj(m, -((int)sizeof( 3240 struct igmp_grouprec))); 3241 } 3242 continue; 3243 } 3244 npbytes += (rsrcs * sizeof(in_addr_t)); 3245 if (crt == REC_ALLOW) 3246 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3247 else if (crt == REC_BLOCK) 3248 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3249 pig->ig_numsrc = htons(rsrcs); 3250 /* 3251 * Count the new group record, and enqueue this 3252 * packet if it wasn't already queued. 3253 */ 3254 m->m_pkthdr.vt_nrecs++; 3255 if (m != m0) 3256 mbufq_enqueue(mq, m); 3257 nbytes += npbytes; 3258 } while (nims != NULL); 3259 drt |= crt; 3260 crt = (~crt & REC_FULL); 3261 } 3262 3263 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3264 nallow, nblock); 3265 3266 return (nbytes); 3267 } 3268 3269 static int 3270 igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3271 { 3272 struct mbufq *gq; 3273 struct mbuf *m; /* pending state-change */ 3274 struct mbuf *m0; /* copy of pending state-change */ 3275 struct mbuf *mt; /* last state-change in packet */ 3276 int docopy, domerge; 3277 u_int recslen; 3278 3279 docopy = 0; 3280 domerge = 0; 3281 recslen = 0; 3282 3283 IN_MULTI_LIST_LOCK_ASSERT(); 3284 IGMP_LOCK_ASSERT(); 3285 3286 /* 3287 * If there are further pending retransmissions, make a writable 3288 * copy of each queued state-change message before merging. 3289 */ 3290 if (inm->inm_scrv > 0) 3291 docopy = 1; 3292 3293 gq = &inm->inm_scq; 3294 #ifdef KTR 3295 if (mbufq_first(gq) == NULL) { 3296 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3297 __func__, inm); 3298 } 3299 #endif 3300 3301 m = mbufq_first(gq); 3302 while (m != NULL) { 3303 /* 3304 * Only merge the report into the current packet if 3305 * there is sufficient space to do so; an IGMPv3 report 3306 * packet may only contain 65,535 group records. 3307 * Always use a simple mbuf chain concatentation to do this, 3308 * as large state changes for single groups may have 3309 * allocated clusters. 3310 */ 3311 domerge = 0; 3312 mt = mbufq_last(scq); 3313 if (mt != NULL) { 3314 recslen = m_length(m, NULL); 3315 3316 if ((mt->m_pkthdr.vt_nrecs + 3317 m->m_pkthdr.vt_nrecs <= 3318 IGMP_V3_REPORT_MAXRECS) && 3319 (mt->m_pkthdr.len + recslen <= 3320 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3321 domerge = 1; 3322 } 3323 3324 if (!domerge && mbufq_full(gq)) { 3325 CTR2(KTR_IGMPV3, 3326 "%s: outbound queue full, skipping whole packet %p", 3327 __func__, m); 3328 mt = m->m_nextpkt; 3329 if (!docopy) 3330 m_freem(m); 3331 m = mt; 3332 continue; 3333 } 3334 3335 if (!docopy) { 3336 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3337 m0 = mbufq_dequeue(gq); 3338 m = m0->m_nextpkt; 3339 } else { 3340 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3341 m0 = m_dup(m, M_NOWAIT); 3342 if (m0 == NULL) 3343 return (ENOMEM); 3344 m0->m_nextpkt = NULL; 3345 m = m->m_nextpkt; 3346 } 3347 3348 if (!domerge) { 3349 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3350 __func__, m0, scq); 3351 mbufq_enqueue(scq, m0); 3352 } else { 3353 struct mbuf *mtl; /* last mbuf of packet mt */ 3354 3355 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3356 __func__, m0, mt); 3357 3358 mtl = m_last(mt); 3359 m0->m_flags &= ~M_PKTHDR; 3360 mt->m_pkthdr.len += recslen; 3361 mt->m_pkthdr.vt_nrecs += 3362 m0->m_pkthdr.vt_nrecs; 3363 3364 mtl->m_next = m0; 3365 } 3366 } 3367 3368 return (0); 3369 } 3370 3371 /* 3372 * Respond to a pending IGMPv3 General Query. 3373 */ 3374 static void 3375 igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3376 { 3377 struct ifmultiaddr *ifma; 3378 struct ifnet *ifp; 3379 struct in_multi *inm; 3380 int retval __unused, loop; 3381 3382 IN_MULTI_LIST_LOCK_ASSERT(); 3383 IGMP_LOCK_ASSERT(); 3384 NET_EPOCH_ASSERT(); 3385 3386 KASSERT(igi->igi_version == IGMP_VERSION_3, 3387 ("%s: called when version %d", __func__, igi->igi_version)); 3388 3389 /* 3390 * Check that there are some packets queued. If so, send them first. 3391 * For large number of groups the reply to general query can take 3392 * many packets, we should finish sending them before starting of 3393 * queuing the new reply. 3394 */ 3395 if (mbufq_len(&igi->igi_gq) != 0) 3396 goto send; 3397 3398 ifp = igi->igi_ifp; 3399 3400 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3401 if (ifma->ifma_addr->sa_family != AF_INET || 3402 ifma->ifma_protospec == NULL) 3403 continue; 3404 3405 inm = (struct in_multi *)ifma->ifma_protospec; 3406 KASSERT(ifp == inm->inm_ifp, 3407 ("%s: inconsistent ifp", __func__)); 3408 3409 switch (inm->inm_state) { 3410 case IGMP_NOT_MEMBER: 3411 case IGMP_SILENT_MEMBER: 3412 break; 3413 case IGMP_REPORTING_MEMBER: 3414 case IGMP_IDLE_MEMBER: 3415 case IGMP_LAZY_MEMBER: 3416 case IGMP_SLEEPING_MEMBER: 3417 case IGMP_AWAKENING_MEMBER: 3418 inm->inm_state = IGMP_REPORTING_MEMBER; 3419 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3420 inm, 0, 0, 0); 3421 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3422 __func__, retval); 3423 break; 3424 case IGMP_G_QUERY_PENDING_MEMBER: 3425 case IGMP_SG_QUERY_PENDING_MEMBER: 3426 case IGMP_LEAVING_MEMBER: 3427 break; 3428 } 3429 } 3430 3431 send: 3432 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3433 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3434 3435 /* 3436 * Slew transmission of bursts over 500ms intervals. 3437 */ 3438 if (mbufq_first(&igi->igi_gq) != NULL) { 3439 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3440 IGMP_RESPONSE_BURST_INTERVAL); 3441 V_interface_timers_running = 1; 3442 } 3443 } 3444 3445 /* 3446 * Transmit the next pending IGMP message in the output queue. 3447 * 3448 * We get called from netisr_processqueue(). A mutex private to igmpoq 3449 * will be acquired and released around this routine. 3450 * 3451 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3452 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3453 * a link and uses a link-scope multicast address. 3454 */ 3455 static void 3456 igmp_intr(struct mbuf *m) 3457 { 3458 struct ip_moptions imo; 3459 struct ifnet *ifp; 3460 struct mbuf *ipopts, *m0; 3461 int error; 3462 uint32_t ifindex; 3463 3464 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3465 3466 /* 3467 * Set VNET image pointer from enqueued mbuf chain 3468 * before doing anything else. Whilst we use interface 3469 * indexes to guard against interface detach, they are 3470 * unique to each VIMAGE and must be retrieved. 3471 */ 3472 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3473 ifindex = igmp_restore_context(m); 3474 3475 /* 3476 * Check if the ifnet still exists. This limits the scope of 3477 * any race in the absence of a global ifp lock for low cost 3478 * (an array lookup). 3479 */ 3480 ifp = ifnet_byindex(ifindex); 3481 if (ifp == NULL) { 3482 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3483 __func__, m, ifindex); 3484 m_freem(m); 3485 IPSTAT_INC(ips_noroute); 3486 goto out; 3487 } 3488 3489 ipopts = V_igmp_sendra ? m_raopt : NULL; 3490 3491 imo.imo_multicast_ttl = 1; 3492 imo.imo_multicast_vif = -1; 3493 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3494 3495 /* 3496 * If the user requested that IGMP traffic be explicitly 3497 * redirected to the loopback interface (e.g. they are running a 3498 * MANET interface and the routing protocol needs to see the 3499 * updates), handle this now. 3500 */ 3501 if (m->m_flags & M_IGMP_LOOP) 3502 imo.imo_multicast_ifp = V_loif; 3503 else 3504 imo.imo_multicast_ifp = ifp; 3505 3506 if (m->m_flags & M_IGMPV2) { 3507 m0 = m; 3508 } else { 3509 m0 = igmp_v3_encap_report(ifp, m); 3510 if (m0 == NULL) { 3511 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3512 m_freem(m); 3513 IPSTAT_INC(ips_odropped); 3514 goto out; 3515 } 3516 } 3517 3518 igmp_scrub_context(m0); 3519 m_clrprotoflags(m); 3520 m0->m_pkthdr.rcvif = V_loif; 3521 #ifdef MAC 3522 mac_netinet_igmp_send(ifp, m0); 3523 #endif 3524 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3525 if (error) { 3526 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3527 goto out; 3528 } 3529 3530 IGMPSTAT_INC(igps_snd_reports); 3531 3532 out: 3533 /* 3534 * We must restore the existing vnet pointer before 3535 * continuing as we are run from netisr context. 3536 */ 3537 CURVNET_RESTORE(); 3538 } 3539 3540 /* 3541 * Encapsulate an IGMPv3 report. 3542 * 3543 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3544 * chain has already had its IP/IGMPv3 header prepended. In this case 3545 * the function will not attempt to prepend; the lengths and checksums 3546 * will however be re-computed. 3547 * 3548 * Returns a pointer to the new mbuf chain head, or NULL if the 3549 * allocation failed. 3550 */ 3551 static struct mbuf * 3552 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3553 { 3554 struct igmp_report *igmp; 3555 struct ip *ip; 3556 int hdrlen, igmpreclen; 3557 3558 KASSERT((m->m_flags & M_PKTHDR), 3559 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3560 3561 igmpreclen = m_length(m, NULL); 3562 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); 3563 3564 if (m->m_flags & M_IGMPV3_HDR) { 3565 igmpreclen -= hdrlen; 3566 } else { 3567 M_PREPEND(m, hdrlen, M_NOWAIT); 3568 if (m == NULL) 3569 return (NULL); 3570 m->m_flags |= M_IGMPV3_HDR; 3571 } 3572 3573 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen); 3574 3575 m->m_data += sizeof(struct ip); 3576 m->m_len -= sizeof(struct ip); 3577 3578 igmp = mtod(m, struct igmp_report *); 3579 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; 3580 igmp->ir_rsv1 = 0; 3581 igmp->ir_rsv2 = 0; 3582 igmp->ir_numgrps = htons(m->m_pkthdr.vt_nrecs); 3583 igmp->ir_cksum = 0; 3584 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3585 m->m_pkthdr.vt_nrecs = 0; 3586 3587 m->m_data -= sizeof(struct ip); 3588 m->m_len += sizeof(struct ip); 3589 3590 ip = mtod(m, struct ip *); 3591 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; 3592 ip->ip_len = htons(hdrlen + igmpreclen); 3593 ip->ip_off = htons(IP_DF); 3594 ip->ip_p = IPPROTO_IGMP; 3595 ip->ip_sum = 0; 3596 3597 ip->ip_src.s_addr = INADDR_ANY; 3598 3599 if (m->m_flags & M_IGMP_LOOP) { 3600 struct in_ifaddr *ia; 3601 3602 IFP_TO_IA(ifp, ia); 3603 if (ia != NULL) 3604 ip->ip_src = ia->ia_addr.sin_addr; 3605 } 3606 3607 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); 3608 3609 return (m); 3610 } 3611 3612 #ifdef KTR 3613 static char * 3614 igmp_rec_type_to_str(const int type) 3615 { 3616 3617 switch (type) { 3618 case IGMP_CHANGE_TO_EXCLUDE_MODE: 3619 return "TO_EX"; 3620 break; 3621 case IGMP_CHANGE_TO_INCLUDE_MODE: 3622 return "TO_IN"; 3623 break; 3624 case IGMP_MODE_IS_EXCLUDE: 3625 return "MODE_EX"; 3626 break; 3627 case IGMP_MODE_IS_INCLUDE: 3628 return "MODE_IN"; 3629 break; 3630 case IGMP_ALLOW_NEW_SOURCES: 3631 return "ALLOW_NEW"; 3632 break; 3633 case IGMP_BLOCK_OLD_SOURCES: 3634 return "BLOCK_OLD"; 3635 break; 3636 default: 3637 break; 3638 } 3639 return "unknown"; 3640 } 3641 #endif 3642 3643 #ifdef VIMAGE 3644 static void 3645 vnet_igmp_init(const void *unused __unused) 3646 { 3647 3648 netisr_register_vnet(&igmp_nh); 3649 } 3650 VNET_SYSINIT(vnet_igmp_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3651 vnet_igmp_init, NULL); 3652 3653 static void 3654 vnet_igmp_uninit(const void *unused __unused) 3655 { 3656 3657 /* This can happen when we shutdown the entire network stack. */ 3658 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3659 3660 netisr_unregister_vnet(&igmp_nh); 3661 } 3662 VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3663 vnet_igmp_uninit, NULL); 3664 #endif 3665 3666 #ifdef DDB 3667 DB_SHOW_COMMAND(igi_list, db_show_igi_list) 3668 { 3669 struct igmp_ifsoftc *igi, *tigi; 3670 LIST_HEAD(_igi_list, igmp_ifsoftc) *igi_head; 3671 3672 if (!have_addr) { 3673 db_printf("usage: show igi_list <addr>\n"); 3674 return; 3675 } 3676 igi_head = (struct _igi_list *)addr; 3677 3678 LIST_FOREACH_SAFE(igi, igi_head, igi_link, tigi) { 3679 db_printf("igmp_ifsoftc %p:\n", igi); 3680 db_printf(" ifp %p\n", igi->igi_ifp); 3681 db_printf(" version %u\n", igi->igi_version); 3682 db_printf(" v1_timer %u\n", igi->igi_v1_timer); 3683 db_printf(" v2_timer %u\n", igi->igi_v2_timer); 3684 db_printf(" v3_timer %u\n", igi->igi_v3_timer); 3685 db_printf(" flags %#x\n", igi->igi_flags); 3686 db_printf(" rv %u\n", igi->igi_rv); 3687 db_printf(" qi %u\n", igi->igi_qi); 3688 db_printf(" qri %u\n", igi->igi_qri); 3689 db_printf(" uri %u\n", igi->igi_uri); 3690 /* struct mbufq igi_gq; */ 3691 db_printf("\n"); 3692 } 3693 } 3694 #endif 3695 3696 static int 3697 igmp_modevent(module_t mod, int type, void *unused __unused) 3698 { 3699 3700 switch (type) { 3701 case MOD_LOAD: 3702 CTR1(KTR_IGMPV3, "%s: initializing", __func__); 3703 IGMP_LOCK_INIT(); 3704 m_raopt = igmp_ra_alloc(); 3705 netisr_register(&igmp_nh); 3706 callout_init(&igmpslow_callout, 1); 3707 callout_reset(&igmpslow_callout, hz / IGMP_SLOWHZ, 3708 igmp_slowtimo, NULL); 3709 callout_init(&igmpfast_callout, 1); 3710 callout_reset(&igmpfast_callout, hz / IGMP_FASTHZ, 3711 igmp_fasttimo, NULL); 3712 break; 3713 case MOD_UNLOAD: 3714 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3715 netisr_unregister(&igmp_nh); 3716 m_free(m_raopt); 3717 m_raopt = NULL; 3718 IGMP_LOCK_DESTROY(); 3719 break; 3720 default: 3721 return (EOPNOTSUPP); 3722 } 3723 return (0); 3724 } 3725 3726 static moduledata_t igmp_mod = { 3727 "igmp", 3728 igmp_modevent, 3729 0 3730 }; 3731 DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE); 3732