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/if_private.h> 76 #include <net/netisr.h> 77 #include <net/vnet.h> 78 79 #include <netinet/in.h> 80 #include <netinet/in_var.h> 81 #include <netinet/in_systm.h> 82 #include <netinet/ip.h> 83 #include <netinet/ip_var.h> 84 #include <netinet/ip_options.h> 85 #include <netinet/igmp.h> 86 #include <netinet/igmp_var.h> 87 88 #include <machine/in_cksum.h> 89 90 #include <security/mac/mac_framework.h> 91 92 #ifndef KTR_IGMPV3 93 #define KTR_IGMPV3 KTR_INET 94 #endif 95 96 #define IGMP_SLOWHZ 2 /* 2 slow timeouts per second */ 97 #define IGMP_FASTHZ 5 /* 5 fast timeouts per second */ 98 #define IGMP_RESPONSE_BURST_INTERVAL (IGMP_FASTHZ / 2) 99 100 static struct igmp_ifsoftc * 101 igi_alloc_locked(struct ifnet *); 102 static void igi_delete_locked(const struct ifnet *); 103 static void igmp_dispatch_queue(struct mbufq *, int, const int); 104 static void igmp_fasttimo_vnet(void); 105 static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 106 static int igmp_handle_state_change(struct in_multi *, 107 struct igmp_ifsoftc *); 108 static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 109 static int igmp_input_v1_query(struct ifnet *, const struct ip *, 110 const struct igmp *); 111 static int igmp_input_v2_query(struct ifnet *, const struct ip *, 112 const struct igmp *); 113 static int igmp_input_v3_query(struct ifnet *, const struct ip *, 114 /*const*/ struct igmpv3 *); 115 static int igmp_input_v3_group_query(struct in_multi *, 116 struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 117 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 118 /*const*/ struct igmp *); 119 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 120 /*const*/ struct igmp *); 121 static void igmp_intr(struct mbuf *); 122 static int igmp_isgroupreported(const struct in_addr); 123 static struct mbuf * 124 igmp_ra_alloc(void); 125 #ifdef KTR 126 static char * igmp_rec_type_to_str(const int); 127 #endif 128 static void igmp_set_version(struct igmp_ifsoftc *, const int); 129 static void igmp_slowtimo_vnet(void); 130 static int igmp_v1v2_queue_report(struct in_multi *, const int); 131 static void igmp_v1v2_process_group_timer(struct in_multi *, const int); 132 static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 133 static void igmp_v2_update_group(struct in_multi *, const int); 134 static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 135 static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 136 static struct mbuf * 137 igmp_v3_encap_report(struct ifnet *, struct mbuf *); 138 static int igmp_v3_enqueue_group_record(struct mbufq *, 139 struct in_multi *, const int, const int, const int); 140 static int igmp_v3_enqueue_filter_change(struct mbufq *, 141 struct in_multi *); 142 static void igmp_v3_process_group_timers(struct in_multi_head *, 143 struct mbufq *, struct mbufq *, struct in_multi *, 144 const int); 145 static int igmp_v3_merge_state_changes(struct in_multi *, 146 struct mbufq *); 147 static void igmp_v3_suppress_group_record(struct in_multi *); 148 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 149 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 150 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 151 static int sysctl_igmp_stat(SYSCTL_HANDLER_ARGS); 152 153 static const struct netisr_handler igmp_nh = { 154 .nh_name = "igmp", 155 .nh_handler = igmp_intr, 156 .nh_proto = NETISR_IGMP, 157 .nh_policy = NETISR_POLICY_SOURCE, 158 }; 159 160 /* 161 * System-wide globals. 162 * 163 * Unlocked access to these is OK, except for the global IGMP output 164 * queue. The IGMP subsystem lock ends up being system-wide for the moment, 165 * because all VIMAGEs have to share a global output queue, as netisrs 166 * themselves are not virtualized. 167 * 168 * Locking: 169 * * The permitted lock order is: IN_MULTI_LIST_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 170 * Any may be taken independently; if any are held at the same 171 * time, the above lock order must be followed. 172 * * All output is delegated to the netisr. 173 * Now that Giant has been eliminated, the netisr may be inlined. 174 * * IN_MULTI_LIST_LOCK covers in_multi. 175 * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 176 * including the output queue. 177 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 178 * per-link state iterators. 179 * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 180 * therefore it is not refcounted. 181 * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 182 * 183 * Reference counting 184 * * IGMP acquires its own reference every time an in_multi is passed to 185 * it and the group is being joined for the first time. 186 * * IGMP releases its reference(s) on in_multi in a deferred way, 187 * because the operations which process the release run as part of 188 * a loop whose control variables are directly affected by the release 189 * (that, and not recursing on the IF_ADDR_LOCK). 190 * 191 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 192 * to a vnet in ifp->if_vnet. 193 * 194 * SMPng: XXX We may potentially race operations on ifma_protospec. 195 * The problem is that we currently lack a clean way of taking the 196 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 197 * as anything which modifies ifma needs to be covered by that lock. 198 * So check for ifma_protospec being NULL before proceeding. 199 */ 200 struct mtx igmp_mtx; 201 202 struct mbuf *m_raopt; /* Router Alert option */ 203 static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 204 205 /* 206 * VIMAGE-wide globals. 207 * 208 * The IGMPv3 timers themselves need to run per-image, however, for 209 * historical reasons, timers run globally. This needs to be improved. 210 * An ifnet can only be in one vimage at a time, and the loopback 211 * ifnet, loif, is itself virtualized. 212 * It would otherwise be possible to seriously hose IGMP state, 213 * and create inconsistencies in upstream multicast routing, if you have 214 * multiple VIMAGEs running on the same link joining different multicast 215 * groups, UNLESS the "primary IP address" is different. This is because 216 * IGMP for IPv4 does not force link-local addresses to be used for each 217 * node, unlike MLD for IPv6. 218 * Obviously the IGMPv3 per-interface state has per-vimage granularity 219 * also as a result. 220 * 221 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 222 * policy to control the address used by IGMP on the link. 223 */ 224 VNET_DEFINE_STATIC(int, interface_timers_running); /* IGMPv3 general 225 * query response */ 226 VNET_DEFINE_STATIC(int, state_change_timers_running); /* IGMPv3 state-change 227 * retransmit */ 228 VNET_DEFINE_STATIC(int, current_state_timers_running); /* IGMPv1/v2 host 229 * report; IGMPv3 g/sg 230 * query response */ 231 232 #define V_interface_timers_running VNET(interface_timers_running) 233 #define V_state_change_timers_running VNET(state_change_timers_running) 234 #define V_current_state_timers_running VNET(current_state_timers_running) 235 236 VNET_PCPUSTAT_DEFINE(struct igmpstat, igmpstat); 237 VNET_PCPUSTAT_SYSINIT(igmpstat); 238 VNET_PCPUSTAT_SYSUNINIT(igmpstat); 239 240 VNET_DEFINE_STATIC(LIST_HEAD(, igmp_ifsoftc), igi_head) = 241 LIST_HEAD_INITIALIZER(igi_head); 242 VNET_DEFINE_STATIC(struct timeval, igmp_gsrdelay) = {10, 0}; 243 244 #define V_igi_head VNET(igi_head) 245 #define V_igmp_gsrdelay VNET(igmp_gsrdelay) 246 247 VNET_DEFINE_STATIC(int, igmp_recvifkludge) = 1; 248 VNET_DEFINE_STATIC(int, igmp_sendra) = 1; 249 VNET_DEFINE_STATIC(int, igmp_sendlocal) = 1; 250 VNET_DEFINE_STATIC(int, igmp_v1enable) = 1; 251 VNET_DEFINE_STATIC(int, igmp_v2enable) = 1; 252 VNET_DEFINE_STATIC(int, igmp_legacysupp); 253 VNET_DEFINE_STATIC(int, igmp_default_version) = IGMP_VERSION_3; 254 255 #define V_igmp_recvifkludge VNET(igmp_recvifkludge) 256 #define V_igmp_sendra VNET(igmp_sendra) 257 #define V_igmp_sendlocal VNET(igmp_sendlocal) 258 #define V_igmp_v1enable VNET(igmp_v1enable) 259 #define V_igmp_v2enable VNET(igmp_v2enable) 260 #define V_igmp_legacysupp VNET(igmp_legacysupp) 261 #define V_igmp_default_version VNET(igmp_default_version) 262 263 /* 264 * Virtualized sysctls. 265 */ 266 SYSCTL_PROC(_net_inet_igmp, IGMPCTL_STATS, stats, 267 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_MPSAFE, 268 &VNET_NAME(igmpstat), 0, sysctl_igmp_stat, "S,igmpstat", 269 "IGMP statistics (struct igmpstat, netinet/igmp_var.h)"); 270 SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 271 &VNET_NAME(igmp_recvifkludge), 0, 272 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 273 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 274 &VNET_NAME(igmp_sendra), 0, 275 "Send IP Router Alert option in IGMPv2/v3 messages"); 276 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 277 &VNET_NAME(igmp_sendlocal), 0, 278 "Send IGMP membership reports for 224.0.0.0/24 groups"); 279 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 280 &VNET_NAME(igmp_v1enable), 0, 281 "Enable backwards compatibility with IGMPv1"); 282 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 283 &VNET_NAME(igmp_v2enable), 0, 284 "Enable backwards compatibility with IGMPv2"); 285 SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 286 &VNET_NAME(igmp_legacysupp), 0, 287 "Allow v1/v2 reports to suppress v3 group responses"); 288 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 289 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 290 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 291 "Default version of IGMP to run on each interface"); 292 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 293 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 294 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 295 "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 296 297 /* 298 * Non-virtualized sysctls. 299 */ 300 static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 301 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 302 "Per-interface IGMPv3 state"); 303 304 static __inline void 305 igmp_save_context(struct mbuf *m, struct ifnet *ifp) 306 { 307 308 #ifdef VIMAGE 309 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 310 #endif /* VIMAGE */ 311 m->m_pkthdr.rcvif = ifp; 312 m->m_pkthdr.flowid = ifp->if_index; 313 } 314 315 static __inline void 316 igmp_scrub_context(struct mbuf *m) 317 { 318 319 m->m_pkthdr.PH_loc.ptr = NULL; 320 m->m_pkthdr.flowid = 0; 321 } 322 323 /* 324 * Restore context from a queued IGMP output chain. 325 * Return saved ifindex. 326 * 327 * VIMAGE: The assertion is there to make sure that we 328 * actually called CURVNET_SET() with what's in the mbuf chain. 329 */ 330 static __inline uint32_t 331 igmp_restore_context(struct mbuf *m) 332 { 333 334 #ifdef notyet 335 #if defined(VIMAGE) && defined(INVARIANTS) 336 KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 337 ("%s: called when curvnet was not restored", __func__)); 338 #endif 339 #endif 340 return (m->m_pkthdr.flowid); 341 } 342 343 /* 344 * IGMP statistics. 345 */ 346 static int 347 sysctl_igmp_stat(SYSCTL_HANDLER_ARGS) 348 { 349 struct igmpstat igps0; 350 int error; 351 char *p; 352 353 error = sysctl_wire_old_buffer(req, sizeof(struct igmpstat)); 354 if (error) 355 return (error); 356 357 if (req->oldptr != NULL) { 358 if (req->oldlen < sizeof(struct igmpstat)) 359 error = ENOMEM; 360 else { 361 /* 362 * Copy the counters, and explicitly set the struct's 363 * version and length fields. 364 */ 365 COUNTER_ARRAY_COPY(VNET(igmpstat), &igps0, 366 sizeof(struct igmpstat) / sizeof(uint64_t)); 367 igps0.igps_version = IGPS_VERSION_3; 368 igps0.igps_len = IGPS_VERSION3_LEN; 369 error = SYSCTL_OUT(req, &igps0, 370 sizeof(struct igmpstat)); 371 } 372 } else 373 req->validlen = sizeof(struct igmpstat); 374 if (error) 375 goto out; 376 if (req->newptr != NULL) { 377 if (req->newlen < sizeof(struct igmpstat)) 378 error = ENOMEM; 379 else 380 error = SYSCTL_IN(req, &igps0, 381 sizeof(igps0)); 382 if (error) 383 goto out; 384 /* 385 * igps0 must be "all zero". 386 */ 387 p = (char *)&igps0; 388 while (p < (char *)&igps0 + sizeof(igps0) && *p == '\0') 389 p++; 390 if (p != (char *)&igps0 + sizeof(igps0)) { 391 error = EINVAL; 392 goto out; 393 } 394 COUNTER_ARRAY_ZERO(VNET(igmpstat), 395 sizeof(struct igmpstat) / sizeof(uint64_t)); 396 } 397 out: 398 return (error); 399 } 400 401 /* 402 * Retrieve or set default IGMP version. 403 * 404 * VIMAGE: Assume curvnet set by caller. 405 * SMPng: NOTE: Serialized by IGMP lock. 406 */ 407 static int 408 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 409 { 410 int error; 411 int new; 412 413 error = sysctl_wire_old_buffer(req, sizeof(int)); 414 if (error) 415 return (error); 416 417 IGMP_LOCK(); 418 419 new = V_igmp_default_version; 420 421 error = sysctl_handle_int(oidp, &new, 0, req); 422 if (error || !req->newptr) 423 goto out_locked; 424 425 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 426 error = EINVAL; 427 goto out_locked; 428 } 429 430 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 431 V_igmp_default_version, new); 432 433 V_igmp_default_version = new; 434 435 out_locked: 436 IGMP_UNLOCK(); 437 return (error); 438 } 439 440 /* 441 * Retrieve or set threshold between group-source queries in seconds. 442 * 443 * VIMAGE: Assume curvnet set by caller. 444 * SMPng: NOTE: Serialized by IGMP lock. 445 */ 446 static int 447 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 448 { 449 int error; 450 int i; 451 452 error = sysctl_wire_old_buffer(req, sizeof(int)); 453 if (error) 454 return (error); 455 456 IGMP_LOCK(); 457 458 i = V_igmp_gsrdelay.tv_sec; 459 460 error = sysctl_handle_int(oidp, &i, 0, req); 461 if (error || !req->newptr) 462 goto out_locked; 463 464 if (i < -1 || i >= 60) { 465 error = EINVAL; 466 goto out_locked; 467 } 468 469 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 470 V_igmp_gsrdelay.tv_sec, i); 471 V_igmp_gsrdelay.tv_sec = i; 472 473 out_locked: 474 IGMP_UNLOCK(); 475 return (error); 476 } 477 478 /* 479 * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 480 * For use by ifmcstat(8). 481 * 482 * SMPng: NOTE: Does an unlocked ifindex space read. 483 * VIMAGE: Assume curvnet set by caller. The node handler itself 484 * is not directly virtualized. 485 */ 486 static int 487 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 488 { 489 struct epoch_tracker et; 490 int *name; 491 int error; 492 u_int namelen; 493 struct ifnet *ifp; 494 struct igmp_ifsoftc *igi; 495 496 name = (int *)arg1; 497 namelen = arg2; 498 499 if (req->newptr != NULL) 500 return (EPERM); 501 502 if (namelen != 1) 503 return (EINVAL); 504 505 error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo)); 506 if (error) 507 return (error); 508 509 IN_MULTI_LIST_LOCK(); 510 IGMP_LOCK(); 511 512 error = ENOENT; 513 514 NET_EPOCH_ENTER(et); 515 ifp = ifnet_byindex(name[0]); 516 NET_EPOCH_EXIT(et); 517 if (ifp == NULL) 518 goto out_locked; 519 520 LIST_FOREACH(igi, &V_igi_head, igi_link) { 521 if (ifp == igi->igi_ifp) { 522 struct igmp_ifinfo info; 523 524 info.igi_version = igi->igi_version; 525 info.igi_v1_timer = igi->igi_v1_timer; 526 info.igi_v2_timer = igi->igi_v2_timer; 527 info.igi_v3_timer = igi->igi_v3_timer; 528 info.igi_flags = igi->igi_flags; 529 info.igi_rv = igi->igi_rv; 530 info.igi_qi = igi->igi_qi; 531 info.igi_qri = igi->igi_qri; 532 info.igi_uri = igi->igi_uri; 533 error = SYSCTL_OUT(req, &info, sizeof(info)); 534 break; 535 } 536 } 537 538 out_locked: 539 IGMP_UNLOCK(); 540 IN_MULTI_LIST_UNLOCK(); 541 return (error); 542 } 543 544 /* 545 * Dispatch an entire queue of pending packet chains 546 * using the netisr. 547 * VIMAGE: Assumes the vnet pointer has been set. 548 */ 549 static void 550 igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 551 { 552 struct epoch_tracker et; 553 struct mbuf *m; 554 555 NET_EPOCH_ENTER(et); 556 while ((m = mbufq_dequeue(mq)) != NULL) { 557 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 558 if (loop) 559 m->m_flags |= M_IGMP_LOOP; 560 netisr_dispatch(NETISR_IGMP, m); 561 if (--limit == 0) 562 break; 563 } 564 NET_EPOCH_EXIT(et); 565 } 566 567 /* 568 * Filter outgoing IGMP report state by group. 569 * 570 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 571 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 572 * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 573 * this may break certain IGMP snooping switches which rely on the old 574 * report behaviour. 575 * 576 * Return zero if the given group is one for which IGMP reports 577 * should be suppressed, or non-zero if reports should be issued. 578 */ 579 static __inline int 580 igmp_isgroupreported(const struct in_addr addr) 581 { 582 583 if (in_allhosts(addr) || 584 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 585 return (0); 586 587 return (1); 588 } 589 590 /* 591 * Construct a Router Alert option to use in outgoing packets. 592 */ 593 static struct mbuf * 594 igmp_ra_alloc(void) 595 { 596 struct mbuf *m; 597 struct ipoption *p; 598 599 m = m_get(M_WAITOK, MT_DATA); 600 p = mtod(m, struct ipoption *); 601 p->ipopt_dst.s_addr = INADDR_ANY; 602 p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 603 p->ipopt_list[1] = 0x04; /* 4 bytes long */ 604 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 605 p->ipopt_list[3] = 0x00; /* pad byte */ 606 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 607 608 return (m); 609 } 610 611 /* 612 * Attach IGMP when PF_INET is attached to an interface. 613 */ 614 struct igmp_ifsoftc * 615 igmp_domifattach(struct ifnet *ifp) 616 { 617 struct igmp_ifsoftc *igi; 618 619 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 620 __func__, ifp, ifp->if_xname); 621 622 IGMP_LOCK(); 623 624 igi = igi_alloc_locked(ifp); 625 if (!(ifp->if_flags & IFF_MULTICAST)) 626 igi->igi_flags |= IGIF_SILENT; 627 628 IGMP_UNLOCK(); 629 630 return (igi); 631 } 632 633 /* 634 * VIMAGE: assume curvnet set by caller. 635 */ 636 static struct igmp_ifsoftc * 637 igi_alloc_locked(/*const*/ struct ifnet *ifp) 638 { 639 struct igmp_ifsoftc *igi; 640 641 IGMP_LOCK_ASSERT(); 642 643 igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 644 if (igi == NULL) 645 goto out; 646 647 igi->igi_ifp = ifp; 648 igi->igi_version = V_igmp_default_version; 649 igi->igi_flags = 0; 650 igi->igi_rv = IGMP_RV_INIT; 651 igi->igi_qi = IGMP_QI_INIT; 652 igi->igi_qri = IGMP_QRI_INIT; 653 igi->igi_uri = IGMP_URI_INIT; 654 mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 655 656 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 657 658 CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 659 ifp, ifp->if_xname); 660 661 out: 662 return (igi); 663 } 664 665 /* 666 * Hook for ifdetach. 667 * 668 * NOTE: Some finalization tasks need to run before the protocol domain 669 * is detached, but also before the link layer does its cleanup. 670 * 671 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 672 * XXX This is also bitten by unlocked ifma_protospec access. 673 */ 674 void 675 igmp_ifdetach(struct ifnet *ifp) 676 { 677 struct epoch_tracker et; 678 struct igmp_ifsoftc *igi; 679 struct ifmultiaddr *ifma; 680 struct in_multi *inm; 681 struct in_multi_head inm_free_tmp; 682 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 683 ifp->if_xname); 684 685 SLIST_INIT(&inm_free_tmp); 686 IGMP_LOCK(); 687 688 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 689 if (igi->igi_version == IGMP_VERSION_3) { 690 IF_ADDR_WLOCK(ifp); 691 NET_EPOCH_ENTER(et); 692 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 693 inm = inm_ifmultiaddr_get_inm(ifma); 694 if (inm == NULL) 695 continue; 696 if (inm->inm_state == IGMP_LEAVING_MEMBER) 697 inm_rele_locked(&inm_free_tmp, inm); 698 inm_clear_recorded(inm); 699 } 700 NET_EPOCH_EXIT(et); 701 IF_ADDR_WUNLOCK(ifp); 702 inm_release_list_deferred(&inm_free_tmp); 703 } 704 IGMP_UNLOCK(); 705 706 } 707 708 /* 709 * Hook for domifdetach. 710 */ 711 void 712 igmp_domifdetach(struct ifnet *ifp) 713 { 714 715 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 716 __func__, ifp, ifp->if_xname); 717 718 IGMP_LOCK(); 719 igi_delete_locked(ifp); 720 IGMP_UNLOCK(); 721 } 722 723 static void 724 igi_delete_locked(const struct ifnet *ifp) 725 { 726 struct igmp_ifsoftc *igi, *tigi; 727 728 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 729 __func__, ifp, ifp->if_xname); 730 731 IGMP_LOCK_ASSERT(); 732 733 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 734 if (igi->igi_ifp == ifp) { 735 /* 736 * Free deferred General Query responses. 737 */ 738 mbufq_drain(&igi->igi_gq); 739 740 LIST_REMOVE(igi, igi_link); 741 free(igi, M_IGMP); 742 return; 743 } 744 } 745 } 746 747 /* 748 * Process a received IGMPv1 query. 749 * Return non-zero if the message should be dropped. 750 * 751 * VIMAGE: The curvnet pointer is derived from the input ifp. 752 */ 753 static int 754 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 755 const struct igmp *igmp) 756 { 757 struct ifmultiaddr *ifma; 758 struct igmp_ifsoftc *igi; 759 struct in_multi *inm; 760 761 NET_EPOCH_ASSERT(); 762 763 /* 764 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 765 * 224.0.0.1. They are always treated as General Queries. 766 * igmp_group is always ignored. Do not drop it as a userland 767 * daemon may wish to see it. 768 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 769 */ 770 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 771 IGMPSTAT_INC(igps_rcv_badqueries); 772 return (0); 773 } 774 IGMPSTAT_INC(igps_rcv_gen_queries); 775 776 IN_MULTI_LIST_LOCK(); 777 IGMP_LOCK(); 778 779 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 780 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 781 782 if (igi->igi_flags & IGIF_LOOPBACK) { 783 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 784 ifp, ifp->if_xname); 785 goto out_locked; 786 } 787 788 /* 789 * Switch to IGMPv1 host compatibility mode. 790 */ 791 igmp_set_version(igi, IGMP_VERSION_1); 792 793 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 794 795 /* 796 * Start the timers in all of our group records 797 * for the interface on which the query arrived, 798 * except those which are already running. 799 */ 800 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 801 inm = inm_ifmultiaddr_get_inm(ifma); 802 if (inm == NULL) 803 continue; 804 if (inm->inm_timer != 0) 805 continue; 806 switch (inm->inm_state) { 807 case IGMP_NOT_MEMBER: 808 case IGMP_SILENT_MEMBER: 809 break; 810 case IGMP_G_QUERY_PENDING_MEMBER: 811 case IGMP_SG_QUERY_PENDING_MEMBER: 812 case IGMP_REPORTING_MEMBER: 813 case IGMP_IDLE_MEMBER: 814 case IGMP_LAZY_MEMBER: 815 case IGMP_SLEEPING_MEMBER: 816 case IGMP_AWAKENING_MEMBER: 817 inm->inm_state = IGMP_REPORTING_MEMBER; 818 inm->inm_timer = IGMP_RANDOM_DELAY( 819 IGMP_V1V2_MAX_RI * IGMP_FASTHZ); 820 V_current_state_timers_running = 1; 821 break; 822 case IGMP_LEAVING_MEMBER: 823 break; 824 } 825 } 826 827 out_locked: 828 IGMP_UNLOCK(); 829 IN_MULTI_LIST_UNLOCK(); 830 831 return (0); 832 } 833 834 /* 835 * Process a received IGMPv2 general or group-specific query. 836 */ 837 static int 838 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 839 const struct igmp *igmp) 840 { 841 struct ifmultiaddr *ifma; 842 struct igmp_ifsoftc *igi; 843 struct in_multi *inm; 844 int is_general_query; 845 uint16_t timer; 846 847 NET_EPOCH_ASSERT(); 848 849 is_general_query = 0; 850 851 /* 852 * Validate address fields upfront. 853 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 854 */ 855 if (in_nullhost(igmp->igmp_group)) { 856 /* 857 * IGMPv2 General Query. 858 * If this was not sent to the all-hosts group, ignore it. 859 */ 860 if (!in_allhosts(ip->ip_dst)) 861 return (0); 862 IGMPSTAT_INC(igps_rcv_gen_queries); 863 is_general_query = 1; 864 } else { 865 /* IGMPv2 Group-Specific Query. */ 866 IGMPSTAT_INC(igps_rcv_group_queries); 867 } 868 869 IN_MULTI_LIST_LOCK(); 870 IGMP_LOCK(); 871 872 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 873 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 874 875 if (igi->igi_flags & IGIF_LOOPBACK) { 876 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 877 ifp, ifp->if_xname); 878 goto out_locked; 879 } 880 881 /* 882 * Ignore v2 query if in v1 Compatibility Mode. 883 */ 884 if (igi->igi_version == IGMP_VERSION_1) 885 goto out_locked; 886 887 igmp_set_version(igi, IGMP_VERSION_2); 888 889 timer = igmp->igmp_code * IGMP_FASTHZ / IGMP_TIMER_SCALE; 890 if (timer == 0) 891 timer = 1; 892 893 if (is_general_query) { 894 /* 895 * For each reporting group joined on this 896 * interface, kick the report timer. 897 */ 898 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 899 ifp, ifp->if_xname); 900 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 901 inm = inm_ifmultiaddr_get_inm(ifma); 902 if (inm == NULL) 903 continue; 904 igmp_v2_update_group(inm, timer); 905 } 906 } else { 907 /* 908 * Group-specific IGMPv2 query, we need only 909 * look up the single group to process it. 910 */ 911 inm = inm_lookup(ifp, igmp->igmp_group); 912 if (inm != NULL) { 913 CTR3(KTR_IGMPV3, 914 "process v2 query 0x%08x on ifp %p(%s)", 915 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 916 igmp_v2_update_group(inm, timer); 917 } 918 } 919 920 out_locked: 921 IGMP_UNLOCK(); 922 IN_MULTI_LIST_UNLOCK(); 923 924 return (0); 925 } 926 927 /* 928 * Update the report timer on a group in response to an IGMPv2 query. 929 * 930 * If we are becoming the reporting member for this group, start the timer. 931 * If we already are the reporting member for this group, and timer is 932 * below the threshold, reset it. 933 * 934 * We may be updating the group for the first time since we switched 935 * to IGMPv3. If we are, then we must clear any recorded source lists, 936 * and transition to REPORTING state; the group timer is overloaded 937 * for group and group-source query responses. 938 * 939 * Unlike IGMPv3, the delay per group should be jittered 940 * to avoid bursts of IGMPv2 reports. 941 */ 942 static void 943 igmp_v2_update_group(struct in_multi *inm, const int timer) 944 { 945 946 CTR4(KTR_IGMPV3, "0x%08x: %s/%s timer=%d", __func__, 947 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname, timer); 948 949 IN_MULTI_LIST_LOCK_ASSERT(); 950 951 switch (inm->inm_state) { 952 case IGMP_NOT_MEMBER: 953 case IGMP_SILENT_MEMBER: 954 break; 955 case IGMP_REPORTING_MEMBER: 956 if (inm->inm_timer != 0 && 957 inm->inm_timer <= timer) { 958 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 959 "skipping.", __func__); 960 break; 961 } 962 /* FALLTHROUGH */ 963 case IGMP_SG_QUERY_PENDING_MEMBER: 964 case IGMP_G_QUERY_PENDING_MEMBER: 965 case IGMP_IDLE_MEMBER: 966 case IGMP_LAZY_MEMBER: 967 case IGMP_AWAKENING_MEMBER: 968 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 969 inm->inm_state = IGMP_REPORTING_MEMBER; 970 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 971 V_current_state_timers_running = 1; 972 break; 973 case IGMP_SLEEPING_MEMBER: 974 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 975 inm->inm_state = IGMP_AWAKENING_MEMBER; 976 break; 977 case IGMP_LEAVING_MEMBER: 978 break; 979 } 980 } 981 982 /* 983 * Process a received IGMPv3 general, group-specific or 984 * group-and-source-specific query. 985 * Assumes m has already been pulled up to the full IGMP message length. 986 * Return 0 if successful, otherwise an appropriate error code is returned. 987 */ 988 static int 989 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 990 /*const*/ struct igmpv3 *igmpv3) 991 { 992 struct igmp_ifsoftc *igi; 993 struct in_multi *inm; 994 int is_general_query; 995 uint32_t maxresp, nsrc, qqi; 996 uint16_t timer; 997 uint8_t qrv; 998 999 is_general_query = 0; 1000 1001 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 1002 1003 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 1004 if (maxresp >= 128) { 1005 maxresp = IGMP_MANT(igmpv3->igmp_code) << 1006 (IGMP_EXP(igmpv3->igmp_code) + 3); 1007 } 1008 1009 /* 1010 * Robustness must never be less than 2 for on-wire IGMPv3. 1011 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 1012 * an exception for interfaces whose IGMPv3 state changes 1013 * are redirected to loopback (e.g. MANET). 1014 */ 1015 qrv = IGMP_QRV(igmpv3->igmp_misc); 1016 if (qrv < 2) { 1017 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 1018 qrv, IGMP_RV_INIT); 1019 qrv = IGMP_RV_INIT; 1020 } 1021 1022 qqi = igmpv3->igmp_qqi; 1023 if (qqi >= 128) { 1024 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 1025 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 1026 } 1027 1028 timer = maxresp * IGMP_FASTHZ / IGMP_TIMER_SCALE; 1029 if (timer == 0) 1030 timer = 1; 1031 1032 nsrc = ntohs(igmpv3->igmp_numsrc); 1033 1034 /* 1035 * Validate address fields and versions upfront before 1036 * accepting v3 query. 1037 * XXX SMPng: Unlocked access to igmpstat counters here. 1038 */ 1039 if (in_nullhost(igmpv3->igmp_group)) { 1040 /* 1041 * IGMPv3 General Query. 1042 * 1043 * General Queries SHOULD be directed to 224.0.0.1. 1044 * A general query with a source list has undefined 1045 * behaviour; discard it. 1046 */ 1047 IGMPSTAT_INC(igps_rcv_gen_queries); 1048 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1049 IGMPSTAT_INC(igps_rcv_badqueries); 1050 return (0); 1051 } 1052 is_general_query = 1; 1053 } else { 1054 /* Group or group-source specific query. */ 1055 if (nsrc == 0) 1056 IGMPSTAT_INC(igps_rcv_group_queries); 1057 else 1058 IGMPSTAT_INC(igps_rcv_gsr_queries); 1059 } 1060 1061 IN_MULTI_LIST_LOCK(); 1062 IGMP_LOCK(); 1063 1064 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1065 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1066 1067 if (igi->igi_flags & IGIF_LOOPBACK) { 1068 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1069 ifp, ifp->if_xname); 1070 goto out_locked; 1071 } 1072 1073 /* 1074 * Discard the v3 query if we're in Compatibility Mode. 1075 * The RFC is not obviously worded that hosts need to stay in 1076 * compatibility mode until the Old Version Querier Present 1077 * timer expires. 1078 */ 1079 if (igi->igi_version != IGMP_VERSION_3) { 1080 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1081 igi->igi_version, ifp, ifp->if_xname); 1082 goto out_locked; 1083 } 1084 1085 igmp_set_version(igi, IGMP_VERSION_3); 1086 igi->igi_rv = qrv; 1087 igi->igi_qi = qqi; 1088 igi->igi_qri = maxresp; 1089 1090 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1091 maxresp); 1092 1093 if (is_general_query) { 1094 /* 1095 * Schedule a current-state report on this ifp for 1096 * all groups, possibly containing source lists. 1097 * If there is a pending General Query response 1098 * scheduled earlier than the selected delay, do 1099 * not schedule any other reports. 1100 * Otherwise, reset the interface timer. 1101 */ 1102 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1103 ifp, ifp->if_xname); 1104 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1105 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1106 V_interface_timers_running = 1; 1107 } 1108 } else { 1109 /* 1110 * Group-source-specific queries are throttled on 1111 * a per-group basis to defeat denial-of-service attempts. 1112 * Queries for groups we are not a member of on this 1113 * link are simply ignored. 1114 */ 1115 inm = inm_lookup(ifp, igmpv3->igmp_group); 1116 if (inm == NULL) 1117 goto out_locked; 1118 if (nsrc > 0) { 1119 if (!ratecheck(&inm->inm_lastgsrtv, 1120 &V_igmp_gsrdelay)) { 1121 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1122 __func__); 1123 IGMPSTAT_INC(igps_drop_gsr_queries); 1124 goto out_locked; 1125 } 1126 } 1127 CTR3(KTR_IGMPV3, "process v3 0x%08x query on ifp %p(%s)", 1128 ntohl(igmpv3->igmp_group.s_addr), ifp, ifp->if_xname); 1129 /* 1130 * If there is a pending General Query response 1131 * scheduled sooner than the selected delay, no 1132 * further report need be scheduled. 1133 * Otherwise, prepare to respond to the 1134 * group-specific or group-and-source query. 1135 */ 1136 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1137 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1138 } 1139 1140 out_locked: 1141 IGMP_UNLOCK(); 1142 IN_MULTI_LIST_UNLOCK(); 1143 1144 return (0); 1145 } 1146 1147 /* 1148 * Process a received IGMPv3 group-specific or group-and-source-specific 1149 * query. 1150 * Return <0 if any error occurred. Currently this is ignored. 1151 */ 1152 static int 1153 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1154 int timer, /*const*/ struct igmpv3 *igmpv3) 1155 { 1156 int retval; 1157 uint16_t nsrc; 1158 1159 IN_MULTI_LIST_LOCK_ASSERT(); 1160 IGMP_LOCK_ASSERT(); 1161 1162 retval = 0; 1163 1164 switch (inm->inm_state) { 1165 case IGMP_NOT_MEMBER: 1166 case IGMP_SILENT_MEMBER: 1167 case IGMP_SLEEPING_MEMBER: 1168 case IGMP_LAZY_MEMBER: 1169 case IGMP_AWAKENING_MEMBER: 1170 case IGMP_IDLE_MEMBER: 1171 case IGMP_LEAVING_MEMBER: 1172 return (retval); 1173 break; 1174 case IGMP_REPORTING_MEMBER: 1175 case IGMP_G_QUERY_PENDING_MEMBER: 1176 case IGMP_SG_QUERY_PENDING_MEMBER: 1177 break; 1178 } 1179 1180 nsrc = ntohs(igmpv3->igmp_numsrc); 1181 1182 /* 1183 * Deal with group-specific queries upfront. 1184 * If any group query is already pending, purge any recorded 1185 * source-list state if it exists, and schedule a query response 1186 * for this group-specific query. 1187 */ 1188 if (nsrc == 0) { 1189 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1190 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1191 inm_clear_recorded(inm); 1192 timer = min(inm->inm_timer, timer); 1193 } 1194 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1195 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1196 V_current_state_timers_running = 1; 1197 return (retval); 1198 } 1199 1200 /* 1201 * Deal with the case where a group-and-source-specific query has 1202 * been received but a group-specific query is already pending. 1203 */ 1204 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1205 timer = min(inm->inm_timer, timer); 1206 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1207 V_current_state_timers_running = 1; 1208 return (retval); 1209 } 1210 1211 /* 1212 * Finally, deal with the case where a group-and-source-specific 1213 * query has been received, where a response to a previous g-s-r 1214 * query exists, or none exists. 1215 * In this case, we need to parse the source-list which the Querier 1216 * has provided us with and check if we have any source list filter 1217 * entries at T1 for these sources. If we do not, there is no need 1218 * schedule a report and the query may be dropped. 1219 * If we do, we must record them and schedule a current-state 1220 * report for those sources. 1221 * FIXME: Handling source lists larger than 1 mbuf requires that 1222 * we pass the mbuf chain pointer down to this function, and use 1223 * m_getptr() to walk the chain. 1224 */ 1225 if (inm->inm_nsrc > 0) { 1226 const struct in_addr *ap; 1227 int i, nrecorded; 1228 1229 ap = (const struct in_addr *)(igmpv3 + 1); 1230 nrecorded = 0; 1231 for (i = 0; i < nsrc; i++, ap++) { 1232 retval = inm_record_source(inm, ap->s_addr); 1233 if (retval < 0) 1234 break; 1235 nrecorded += retval; 1236 } 1237 if (nrecorded > 0) { 1238 CTR1(KTR_IGMPV3, 1239 "%s: schedule response to SG query", __func__); 1240 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1241 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1242 V_current_state_timers_running = 1; 1243 } 1244 } 1245 1246 return (retval); 1247 } 1248 1249 /* 1250 * Process a received IGMPv1 host membership report. 1251 * 1252 * NOTE: 0.0.0.0 workaround breaks const correctness. 1253 */ 1254 static int 1255 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1256 /*const*/ struct igmp *igmp) 1257 { 1258 struct in_ifaddr *ia; 1259 struct in_multi *inm; 1260 1261 IGMPSTAT_INC(igps_rcv_reports); 1262 1263 if (ifp->if_flags & IFF_LOOPBACK) 1264 return (0); 1265 1266 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1267 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1268 IGMPSTAT_INC(igps_rcv_badreports); 1269 return (EINVAL); 1270 } 1271 1272 /* 1273 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1274 * Booting clients may use the source address 0.0.0.0. Some 1275 * IGMP daemons may not know how to use IP_RECVIF to determine 1276 * the interface upon which this message was received. 1277 * Replace 0.0.0.0 with the subnet address if told to do so. 1278 */ 1279 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1280 IFP_TO_IA(ifp, ia); 1281 if (ia != NULL) 1282 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1283 } 1284 1285 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1286 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1287 1288 /* 1289 * IGMPv1 report suppression. 1290 * If we are a member of this group, and our membership should be 1291 * reported, stop our group timer and transition to the 'lazy' state. 1292 */ 1293 IN_MULTI_LIST_LOCK(); 1294 inm = inm_lookup(ifp, igmp->igmp_group); 1295 if (inm != NULL) { 1296 struct igmp_ifsoftc *igi; 1297 1298 igi = inm->inm_igi; 1299 if (igi == NULL) { 1300 KASSERT(igi != NULL, 1301 ("%s: no igi for ifp %p", __func__, ifp)); 1302 goto out_locked; 1303 } 1304 1305 IGMPSTAT_INC(igps_rcv_ourreports); 1306 1307 /* 1308 * If we are in IGMPv3 host mode, do not allow the 1309 * other host's IGMPv1 report to suppress our reports 1310 * unless explicitly configured to do so. 1311 */ 1312 if (igi->igi_version == IGMP_VERSION_3) { 1313 if (V_igmp_legacysupp) 1314 igmp_v3_suppress_group_record(inm); 1315 goto out_locked; 1316 } 1317 1318 inm->inm_timer = 0; 1319 1320 switch (inm->inm_state) { 1321 case IGMP_NOT_MEMBER: 1322 case IGMP_SILENT_MEMBER: 1323 break; 1324 case IGMP_IDLE_MEMBER: 1325 case IGMP_LAZY_MEMBER: 1326 case IGMP_AWAKENING_MEMBER: 1327 CTR3(KTR_IGMPV3, 1328 "report suppressed for 0x%08x on ifp %p(%s)", 1329 ntohl(igmp->igmp_group.s_addr), ifp, 1330 ifp->if_xname); 1331 case IGMP_SLEEPING_MEMBER: 1332 inm->inm_state = IGMP_SLEEPING_MEMBER; 1333 break; 1334 case IGMP_REPORTING_MEMBER: 1335 CTR3(KTR_IGMPV3, 1336 "report suppressed for 0x%08x on ifp %p(%s)", 1337 ntohl(igmp->igmp_group.s_addr), ifp, 1338 ifp->if_xname); 1339 if (igi->igi_version == IGMP_VERSION_1) 1340 inm->inm_state = IGMP_LAZY_MEMBER; 1341 else if (igi->igi_version == IGMP_VERSION_2) 1342 inm->inm_state = IGMP_SLEEPING_MEMBER; 1343 break; 1344 case IGMP_G_QUERY_PENDING_MEMBER: 1345 case IGMP_SG_QUERY_PENDING_MEMBER: 1346 case IGMP_LEAVING_MEMBER: 1347 break; 1348 } 1349 } 1350 1351 out_locked: 1352 IN_MULTI_LIST_UNLOCK(); 1353 1354 return (0); 1355 } 1356 1357 /* 1358 * Process a received IGMPv2 host membership report. 1359 * 1360 * NOTE: 0.0.0.0 workaround breaks const correctness. 1361 */ 1362 static int 1363 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1364 /*const*/ struct igmp *igmp) 1365 { 1366 struct in_ifaddr *ia; 1367 struct in_multi *inm; 1368 1369 /* 1370 * Make sure we don't hear our own membership report. Fast 1371 * leave requires knowing that we are the only member of a 1372 * group. 1373 */ 1374 IFP_TO_IA(ifp, ia); 1375 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1376 return (0); 1377 } 1378 1379 IGMPSTAT_INC(igps_rcv_reports); 1380 1381 if (ifp->if_flags & IFF_LOOPBACK) { 1382 return (0); 1383 } 1384 1385 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1386 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1387 IGMPSTAT_INC(igps_rcv_badreports); 1388 return (EINVAL); 1389 } 1390 1391 /* 1392 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1393 * Booting clients may use the source address 0.0.0.0. Some 1394 * IGMP daemons may not know how to use IP_RECVIF to determine 1395 * the interface upon which this message was received. 1396 * Replace 0.0.0.0 with the subnet address if told to do so. 1397 */ 1398 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1399 if (ia != NULL) 1400 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1401 } 1402 1403 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1404 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1405 1406 /* 1407 * IGMPv2 report suppression. 1408 * If we are a member of this group, and our membership should be 1409 * reported, and our group timer is pending or about to be reset, 1410 * stop our group timer by transitioning to the 'lazy' state. 1411 */ 1412 IN_MULTI_LIST_LOCK(); 1413 inm = inm_lookup(ifp, igmp->igmp_group); 1414 if (inm != NULL) { 1415 struct igmp_ifsoftc *igi; 1416 1417 igi = inm->inm_igi; 1418 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1419 1420 IGMPSTAT_INC(igps_rcv_ourreports); 1421 1422 /* 1423 * If we are in IGMPv3 host mode, do not allow the 1424 * other host's IGMPv1 report to suppress our reports 1425 * unless explicitly configured to do so. 1426 */ 1427 if (igi->igi_version == IGMP_VERSION_3) { 1428 if (V_igmp_legacysupp) 1429 igmp_v3_suppress_group_record(inm); 1430 goto out_locked; 1431 } 1432 1433 inm->inm_timer = 0; 1434 1435 switch (inm->inm_state) { 1436 case IGMP_NOT_MEMBER: 1437 case IGMP_SILENT_MEMBER: 1438 case IGMP_SLEEPING_MEMBER: 1439 break; 1440 case IGMP_REPORTING_MEMBER: 1441 case IGMP_IDLE_MEMBER: 1442 case IGMP_AWAKENING_MEMBER: 1443 CTR3(KTR_IGMPV3, 1444 "report suppressed for 0x%08x on ifp %p(%s)", 1445 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1446 case IGMP_LAZY_MEMBER: 1447 inm->inm_state = IGMP_LAZY_MEMBER; 1448 break; 1449 case IGMP_G_QUERY_PENDING_MEMBER: 1450 case IGMP_SG_QUERY_PENDING_MEMBER: 1451 case IGMP_LEAVING_MEMBER: 1452 break; 1453 } 1454 } 1455 1456 out_locked: 1457 IN_MULTI_LIST_UNLOCK(); 1458 1459 return (0); 1460 } 1461 1462 int 1463 igmp_input(struct mbuf **mp, int *offp, int proto) 1464 { 1465 int iphlen; 1466 struct ifnet *ifp; 1467 struct igmp *igmp; 1468 struct ip *ip; 1469 struct mbuf *m; 1470 int igmplen; 1471 int minlen; 1472 int queryver; 1473 1474 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1475 1476 m = *mp; 1477 ifp = m->m_pkthdr.rcvif; 1478 *mp = NULL; 1479 1480 IGMPSTAT_INC(igps_rcv_total); 1481 1482 ip = mtod(m, struct ip *); 1483 iphlen = *offp; 1484 igmplen = ntohs(ip->ip_len) - iphlen; 1485 1486 /* 1487 * Validate lengths. 1488 */ 1489 if (igmplen < IGMP_MINLEN) { 1490 IGMPSTAT_INC(igps_rcv_tooshort); 1491 m_freem(m); 1492 return (IPPROTO_DONE); 1493 } 1494 1495 /* 1496 * Always pullup to the minimum size for v1/v2 or v3 1497 * to amortize calls to m_pullup(). 1498 */ 1499 minlen = iphlen; 1500 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1501 minlen += IGMP_V3_QUERY_MINLEN; 1502 else 1503 minlen += IGMP_MINLEN; 1504 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1505 (m = m_pullup(m, minlen)) == NULL) { 1506 IGMPSTAT_INC(igps_rcv_tooshort); 1507 return (IPPROTO_DONE); 1508 } 1509 ip = mtod(m, struct ip *); 1510 1511 /* 1512 * Validate checksum. 1513 */ 1514 m->m_data += iphlen; 1515 m->m_len -= iphlen; 1516 igmp = mtod(m, struct igmp *); 1517 if (in_cksum(m, igmplen)) { 1518 IGMPSTAT_INC(igps_rcv_badsum); 1519 m_freem(m); 1520 return (IPPROTO_DONE); 1521 } 1522 m->m_data -= iphlen; 1523 m->m_len += iphlen; 1524 1525 /* 1526 * IGMP control traffic is link-scope, and must have a TTL of 1. 1527 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1528 * probe packets may come from beyond the LAN. 1529 */ 1530 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1531 IGMPSTAT_INC(igps_rcv_badttl); 1532 m_freem(m); 1533 return (IPPROTO_DONE); 1534 } 1535 1536 switch (igmp->igmp_type) { 1537 case IGMP_HOST_MEMBERSHIP_QUERY: 1538 if (igmplen == IGMP_MINLEN) { 1539 if (igmp->igmp_code == 0) 1540 queryver = IGMP_VERSION_1; 1541 else 1542 queryver = IGMP_VERSION_2; 1543 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1544 queryver = IGMP_VERSION_3; 1545 } else { 1546 IGMPSTAT_INC(igps_rcv_tooshort); 1547 m_freem(m); 1548 return (IPPROTO_DONE); 1549 } 1550 1551 switch (queryver) { 1552 case IGMP_VERSION_1: 1553 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1554 if (!V_igmp_v1enable) 1555 break; 1556 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1557 m_freem(m); 1558 return (IPPROTO_DONE); 1559 } 1560 break; 1561 1562 case IGMP_VERSION_2: 1563 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1564 if (!V_igmp_v2enable) 1565 break; 1566 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1567 m_freem(m); 1568 return (IPPROTO_DONE); 1569 } 1570 break; 1571 1572 case IGMP_VERSION_3: { 1573 struct igmpv3 *igmpv3; 1574 uint16_t igmpv3len; 1575 uint16_t nsrc; 1576 1577 IGMPSTAT_INC(igps_rcv_v3_queries); 1578 igmpv3 = (struct igmpv3 *)igmp; 1579 /* 1580 * Validate length based on source count. 1581 */ 1582 nsrc = ntohs(igmpv3->igmp_numsrc); 1583 if (nsrc * sizeof(in_addr_t) > 1584 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1585 IGMPSTAT_INC(igps_rcv_tooshort); 1586 m_freem(m); 1587 return (IPPROTO_DONE); 1588 } 1589 /* 1590 * m_pullup() may modify m, so pullup in 1591 * this scope. 1592 */ 1593 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1594 sizeof(struct in_addr) * nsrc; 1595 if ((!M_WRITABLE(m) || 1596 m->m_len < igmpv3len) && 1597 (m = m_pullup(m, igmpv3len)) == NULL) { 1598 IGMPSTAT_INC(igps_rcv_tooshort); 1599 return (IPPROTO_DONE); 1600 } 1601 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1602 + iphlen); 1603 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1604 m_freem(m); 1605 return (IPPROTO_DONE); 1606 } 1607 } 1608 break; 1609 } 1610 break; 1611 1612 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1613 if (!V_igmp_v1enable) 1614 break; 1615 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1616 m_freem(m); 1617 return (IPPROTO_DONE); 1618 } 1619 break; 1620 1621 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1622 if (!V_igmp_v2enable) 1623 break; 1624 if (!ip_checkrouteralert(m)) 1625 IGMPSTAT_INC(igps_rcv_nora); 1626 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1627 m_freem(m); 1628 return (IPPROTO_DONE); 1629 } 1630 break; 1631 1632 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1633 /* 1634 * Hosts do not need to process IGMPv3 membership reports, 1635 * as report suppression is no longer required. 1636 */ 1637 if (!ip_checkrouteralert(m)) 1638 IGMPSTAT_INC(igps_rcv_nora); 1639 break; 1640 1641 default: 1642 break; 1643 } 1644 1645 /* 1646 * Pass all valid IGMP packets up to any process(es) listening on a 1647 * raw IGMP socket. 1648 */ 1649 *mp = m; 1650 return (rip_input(mp, offp, proto)); 1651 } 1652 1653 /* 1654 * Fast timeout handler (global). 1655 * VIMAGE: Timeout handlers are expected to service all vimages. 1656 */ 1657 static struct callout igmpfast_callout; 1658 static void 1659 igmp_fasttimo(void *arg __unused) 1660 { 1661 struct epoch_tracker et; 1662 VNET_ITERATOR_DECL(vnet_iter); 1663 1664 NET_EPOCH_ENTER(et); 1665 VNET_LIST_RLOCK_NOSLEEP(); 1666 VNET_FOREACH(vnet_iter) { 1667 CURVNET_SET(vnet_iter); 1668 igmp_fasttimo_vnet(); 1669 CURVNET_RESTORE(); 1670 } 1671 VNET_LIST_RUNLOCK_NOSLEEP(); 1672 NET_EPOCH_EXIT(et); 1673 1674 callout_reset(&igmpfast_callout, hz / IGMP_FASTHZ, igmp_fasttimo, NULL); 1675 } 1676 1677 /* 1678 * Fast timeout handler (per-vnet). 1679 * Sends are shuffled off to a netisr to deal with Giant. 1680 * 1681 * VIMAGE: Assume caller has set up our curvnet. 1682 */ 1683 static void 1684 igmp_fasttimo_vnet(void) 1685 { 1686 struct mbufq scq; /* State-change packets */ 1687 struct mbufq qrq; /* Query response packets */ 1688 struct ifnet *ifp; 1689 struct igmp_ifsoftc *igi; 1690 struct ifmultiaddr *ifma; 1691 struct in_multi *inm; 1692 struct in_multi_head inm_free_tmp; 1693 int loop, uri_fasthz; 1694 1695 loop = 0; 1696 uri_fasthz = 0; 1697 1698 /* 1699 * Quick check to see if any work needs to be done, in order to 1700 * minimize the overhead of fasttimo processing. 1701 * SMPng: XXX Unlocked reads. 1702 */ 1703 if (!V_current_state_timers_running && 1704 !V_interface_timers_running && 1705 !V_state_change_timers_running) 1706 return; 1707 1708 SLIST_INIT(&inm_free_tmp); 1709 IN_MULTI_LIST_LOCK(); 1710 IGMP_LOCK(); 1711 1712 /* 1713 * IGMPv3 General Query response timer processing. 1714 */ 1715 if (V_interface_timers_running) { 1716 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1717 1718 V_interface_timers_running = 0; 1719 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1720 if (igi->igi_v3_timer == 0) { 1721 /* Do nothing. */ 1722 } else if (--igi->igi_v3_timer == 0) { 1723 igmp_v3_dispatch_general_query(igi); 1724 } else { 1725 V_interface_timers_running = 1; 1726 } 1727 } 1728 } 1729 1730 if (!V_current_state_timers_running && 1731 !V_state_change_timers_running) 1732 goto out_locked; 1733 1734 V_current_state_timers_running = 0; 1735 V_state_change_timers_running = 0; 1736 1737 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1738 1739 /* 1740 * IGMPv1/v2/v3 host report and state-change timer processing. 1741 * Note: Processing a v3 group timer may remove a node. 1742 */ 1743 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1744 ifp = igi->igi_ifp; 1745 1746 if (igi->igi_version == IGMP_VERSION_3) { 1747 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1748 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1749 IGMP_FASTHZ); 1750 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1751 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1752 } 1753 1754 IF_ADDR_WLOCK(ifp); 1755 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1756 inm = inm_ifmultiaddr_get_inm(ifma); 1757 if (inm == NULL) 1758 continue; 1759 switch (igi->igi_version) { 1760 case IGMP_VERSION_1: 1761 case IGMP_VERSION_2: 1762 igmp_v1v2_process_group_timer(inm, 1763 igi->igi_version); 1764 break; 1765 case IGMP_VERSION_3: 1766 igmp_v3_process_group_timers(&inm_free_tmp, &qrq, 1767 &scq, inm, uri_fasthz); 1768 break; 1769 } 1770 } 1771 IF_ADDR_WUNLOCK(ifp); 1772 1773 if (igi->igi_version == IGMP_VERSION_3) { 1774 igmp_dispatch_queue(&qrq, 0, loop); 1775 igmp_dispatch_queue(&scq, 0, loop); 1776 1777 /* 1778 * Free the in_multi reference(s) for this 1779 * IGMP lifecycle. 1780 */ 1781 inm_release_list_deferred(&inm_free_tmp); 1782 } 1783 } 1784 1785 out_locked: 1786 IGMP_UNLOCK(); 1787 IN_MULTI_LIST_UNLOCK(); 1788 } 1789 1790 /* 1791 * Update host report group timer for IGMPv1/v2. 1792 * Will update the global pending timer flags. 1793 */ 1794 static void 1795 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1796 { 1797 int report_timer_expired; 1798 1799 IN_MULTI_LIST_LOCK_ASSERT(); 1800 IGMP_LOCK_ASSERT(); 1801 1802 if (inm->inm_timer == 0) { 1803 report_timer_expired = 0; 1804 } else if (--inm->inm_timer == 0) { 1805 report_timer_expired = 1; 1806 } else { 1807 V_current_state_timers_running = 1; 1808 return; 1809 } 1810 1811 switch (inm->inm_state) { 1812 case IGMP_NOT_MEMBER: 1813 case IGMP_SILENT_MEMBER: 1814 case IGMP_IDLE_MEMBER: 1815 case IGMP_LAZY_MEMBER: 1816 case IGMP_SLEEPING_MEMBER: 1817 case IGMP_AWAKENING_MEMBER: 1818 break; 1819 case IGMP_REPORTING_MEMBER: 1820 if (report_timer_expired) { 1821 inm->inm_state = IGMP_IDLE_MEMBER; 1822 (void)igmp_v1v2_queue_report(inm, 1823 (version == IGMP_VERSION_2) ? 1824 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1825 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1826 } 1827 break; 1828 case IGMP_G_QUERY_PENDING_MEMBER: 1829 case IGMP_SG_QUERY_PENDING_MEMBER: 1830 case IGMP_LEAVING_MEMBER: 1831 break; 1832 } 1833 } 1834 1835 /* 1836 * Update a group's timers for IGMPv3. 1837 * Will update the global pending timer flags. 1838 * Note: Unlocked read from igi. 1839 */ 1840 static void 1841 igmp_v3_process_group_timers(struct in_multi_head *inmh, 1842 struct mbufq *qrq, struct mbufq *scq, 1843 struct in_multi *inm, const int uri_fasthz) 1844 { 1845 int query_response_timer_expired; 1846 int state_change_retransmit_timer_expired; 1847 1848 IN_MULTI_LIST_LOCK_ASSERT(); 1849 IGMP_LOCK_ASSERT(); 1850 1851 query_response_timer_expired = 0; 1852 state_change_retransmit_timer_expired = 0; 1853 1854 /* 1855 * During a transition from v1/v2 compatibility mode back to v3, 1856 * a group record in REPORTING state may still have its group 1857 * timer active. This is a no-op in this function; it is easier 1858 * to deal with it here than to complicate the slow-timeout path. 1859 */ 1860 if (inm->inm_timer == 0) { 1861 query_response_timer_expired = 0; 1862 } else if (--inm->inm_timer == 0) { 1863 query_response_timer_expired = 1; 1864 } else { 1865 V_current_state_timers_running = 1; 1866 } 1867 1868 if (inm->inm_sctimer == 0) { 1869 state_change_retransmit_timer_expired = 0; 1870 } else if (--inm->inm_sctimer == 0) { 1871 state_change_retransmit_timer_expired = 1; 1872 } else { 1873 V_state_change_timers_running = 1; 1874 } 1875 1876 /* We are in fasttimo, so be quick about it. */ 1877 if (!state_change_retransmit_timer_expired && 1878 !query_response_timer_expired) 1879 return; 1880 1881 switch (inm->inm_state) { 1882 case IGMP_NOT_MEMBER: 1883 case IGMP_SILENT_MEMBER: 1884 case IGMP_SLEEPING_MEMBER: 1885 case IGMP_LAZY_MEMBER: 1886 case IGMP_AWAKENING_MEMBER: 1887 case IGMP_IDLE_MEMBER: 1888 break; 1889 case IGMP_G_QUERY_PENDING_MEMBER: 1890 case IGMP_SG_QUERY_PENDING_MEMBER: 1891 /* 1892 * Respond to a previously pending Group-Specific 1893 * or Group-and-Source-Specific query by enqueueing 1894 * the appropriate Current-State report for 1895 * immediate transmission. 1896 */ 1897 if (query_response_timer_expired) { 1898 int retval __unused; 1899 1900 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1901 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1902 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1903 __func__, retval); 1904 inm->inm_state = IGMP_REPORTING_MEMBER; 1905 /* XXX Clear recorded sources for next time. */ 1906 inm_clear_recorded(inm); 1907 } 1908 /* FALLTHROUGH */ 1909 case IGMP_REPORTING_MEMBER: 1910 case IGMP_LEAVING_MEMBER: 1911 if (state_change_retransmit_timer_expired) { 1912 /* 1913 * State-change retransmission timer fired. 1914 * If there are any further pending retransmissions, 1915 * set the global pending state-change flag, and 1916 * reset the timer. 1917 */ 1918 if (--inm->inm_scrv > 0) { 1919 inm->inm_sctimer = uri_fasthz; 1920 V_state_change_timers_running = 1; 1921 } 1922 /* 1923 * Retransmit the previously computed state-change 1924 * report. If there are no further pending 1925 * retransmissions, the mbuf queue will be consumed. 1926 * Update T0 state to T1 as we have now sent 1927 * a state-change. 1928 */ 1929 (void)igmp_v3_merge_state_changes(inm, scq); 1930 1931 inm_commit(inm); 1932 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1933 ntohl(inm->inm_addr.s_addr), 1934 inm->inm_ifp->if_xname); 1935 1936 /* 1937 * If we are leaving the group for good, make sure 1938 * we release IGMP's reference to it. 1939 * This release must be deferred using a SLIST, 1940 * as we are called from a loop which traverses 1941 * the in_ifmultiaddr TAILQ. 1942 */ 1943 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1944 inm->inm_scrv == 0) { 1945 inm->inm_state = IGMP_NOT_MEMBER; 1946 inm_rele_locked(inmh, inm); 1947 } 1948 } 1949 break; 1950 } 1951 } 1952 1953 /* 1954 * Suppress a group's pending response to a group or source/group query. 1955 * 1956 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1957 * Do NOT update ST1/ST0 as this operation merely suppresses 1958 * the currently pending group record. 1959 * Do NOT suppress the response to a general query. It is possible but 1960 * it would require adding another state or flag. 1961 */ 1962 static void 1963 igmp_v3_suppress_group_record(struct in_multi *inm) 1964 { 1965 1966 IN_MULTI_LIST_LOCK_ASSERT(); 1967 1968 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1969 ("%s: not IGMPv3 mode on link", __func__)); 1970 1971 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1972 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1973 return; 1974 1975 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1976 inm_clear_recorded(inm); 1977 1978 inm->inm_timer = 0; 1979 inm->inm_state = IGMP_REPORTING_MEMBER; 1980 } 1981 1982 /* 1983 * Switch to a different IGMP version on the given interface, 1984 * as per Section 7.2.1. 1985 */ 1986 static void 1987 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1988 { 1989 int old_version_timer; 1990 1991 IGMP_LOCK_ASSERT(); 1992 1993 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 1994 version, igi->igi_ifp, igi->igi_ifp->if_xname); 1995 1996 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 1997 /* 1998 * Compute the "Older Version Querier Present" timer as per 1999 * Section 8.12. 2000 */ 2001 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 2002 old_version_timer *= IGMP_SLOWHZ; 2003 2004 if (version == IGMP_VERSION_1) { 2005 igi->igi_v1_timer = old_version_timer; 2006 igi->igi_v2_timer = 0; 2007 } else if (version == IGMP_VERSION_2) { 2008 igi->igi_v1_timer = 0; 2009 igi->igi_v2_timer = old_version_timer; 2010 } 2011 } 2012 2013 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2014 if (igi->igi_version != IGMP_VERSION_2) { 2015 igi->igi_version = IGMP_VERSION_2; 2016 igmp_v3_cancel_link_timers(igi); 2017 } 2018 } else if (igi->igi_v1_timer > 0) { 2019 if (igi->igi_version != IGMP_VERSION_1) { 2020 igi->igi_version = IGMP_VERSION_1; 2021 igmp_v3_cancel_link_timers(igi); 2022 } 2023 } 2024 } 2025 2026 /* 2027 * Cancel pending IGMPv3 timers for the given link and all groups 2028 * joined on it; state-change, general-query, and group-query timers. 2029 * 2030 * Only ever called on a transition from v3 to Compatibility mode. Kill 2031 * the timers stone dead (this may be expensive for large N groups), they 2032 * will be restarted if Compatibility Mode deems that they must be due to 2033 * query processing. 2034 */ 2035 static void 2036 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2037 { 2038 struct ifmultiaddr *ifma; 2039 struct ifnet *ifp; 2040 struct in_multi *inm; 2041 struct in_multi_head inm_free_tmp; 2042 2043 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2044 igi->igi_ifp, igi->igi_ifp->if_xname); 2045 2046 IN_MULTI_LIST_LOCK_ASSERT(); 2047 IGMP_LOCK_ASSERT(); 2048 NET_EPOCH_ASSERT(); 2049 2050 SLIST_INIT(&inm_free_tmp); 2051 2052 /* 2053 * Stop the v3 General Query Response on this link stone dead. 2054 * If fasttimo is woken up due to V_interface_timers_running, 2055 * the flag will be cleared if there are no pending link timers. 2056 */ 2057 igi->igi_v3_timer = 0; 2058 2059 /* 2060 * Now clear the current-state and state-change report timers 2061 * for all memberships scoped to this link. 2062 */ 2063 ifp = igi->igi_ifp; 2064 IF_ADDR_WLOCK(ifp); 2065 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2066 inm = inm_ifmultiaddr_get_inm(ifma); 2067 if (inm == NULL) 2068 continue; 2069 switch (inm->inm_state) { 2070 case IGMP_NOT_MEMBER: 2071 case IGMP_SILENT_MEMBER: 2072 case IGMP_IDLE_MEMBER: 2073 case IGMP_LAZY_MEMBER: 2074 case IGMP_SLEEPING_MEMBER: 2075 case IGMP_AWAKENING_MEMBER: 2076 /* 2077 * These states are either not relevant in v3 mode, 2078 * or are unreported. Do nothing. 2079 */ 2080 break; 2081 case IGMP_LEAVING_MEMBER: 2082 /* 2083 * If we are leaving the group and switching to 2084 * compatibility mode, we need to release the final 2085 * reference held for issuing the INCLUDE {}, and 2086 * transition to REPORTING to ensure the host leave 2087 * message is sent upstream to the old querier -- 2088 * transition to NOT would lose the leave and race. 2089 */ 2090 inm_rele_locked(&inm_free_tmp, inm); 2091 /* FALLTHROUGH */ 2092 case IGMP_G_QUERY_PENDING_MEMBER: 2093 case IGMP_SG_QUERY_PENDING_MEMBER: 2094 inm_clear_recorded(inm); 2095 /* FALLTHROUGH */ 2096 case IGMP_REPORTING_MEMBER: 2097 inm->inm_state = IGMP_REPORTING_MEMBER; 2098 break; 2099 } 2100 /* 2101 * Always clear state-change and group report timers. 2102 * Free any pending IGMPv3 state-change records. 2103 */ 2104 inm->inm_sctimer = 0; 2105 inm->inm_timer = 0; 2106 mbufq_drain(&inm->inm_scq); 2107 } 2108 IF_ADDR_WUNLOCK(ifp); 2109 2110 inm_release_list_deferred(&inm_free_tmp); 2111 } 2112 2113 /* 2114 * Update the Older Version Querier Present timers for a link. 2115 * See Section 7.2.1 of RFC 3376. 2116 */ 2117 static void 2118 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2119 { 2120 2121 IGMP_LOCK_ASSERT(); 2122 2123 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2124 /* 2125 * IGMPv1 and IGMPv2 Querier Present timers expired. 2126 * 2127 * Revert to IGMPv3. 2128 */ 2129 if (igi->igi_version != IGMP_VERSION_3) { 2130 CTR5(KTR_IGMPV3, 2131 "%s: transition from v%d -> v%d on %p(%s)", 2132 __func__, igi->igi_version, IGMP_VERSION_3, 2133 igi->igi_ifp, igi->igi_ifp->if_xname); 2134 igi->igi_version = IGMP_VERSION_3; 2135 } 2136 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2137 /* 2138 * IGMPv1 Querier Present timer expired, 2139 * IGMPv2 Querier Present timer running. 2140 * If IGMPv2 was disabled since last timeout, 2141 * revert to IGMPv3. 2142 * If IGMPv2 is enabled, revert to IGMPv2. 2143 */ 2144 if (!V_igmp_v2enable) { 2145 CTR5(KTR_IGMPV3, 2146 "%s: transition from v%d -> v%d on %p(%s)", 2147 __func__, igi->igi_version, IGMP_VERSION_3, 2148 igi->igi_ifp, igi->igi_ifp->if_xname); 2149 igi->igi_v2_timer = 0; 2150 igi->igi_version = IGMP_VERSION_3; 2151 } else { 2152 --igi->igi_v2_timer; 2153 if (igi->igi_version != IGMP_VERSION_2) { 2154 CTR5(KTR_IGMPV3, 2155 "%s: transition from v%d -> v%d on %p(%s)", 2156 __func__, igi->igi_version, IGMP_VERSION_2, 2157 igi->igi_ifp, igi->igi_ifp->if_xname); 2158 igi->igi_version = IGMP_VERSION_2; 2159 igmp_v3_cancel_link_timers(igi); 2160 } 2161 } 2162 } else if (igi->igi_v1_timer > 0) { 2163 /* 2164 * IGMPv1 Querier Present timer running. 2165 * Stop IGMPv2 timer if running. 2166 * 2167 * If IGMPv1 was disabled since last timeout, 2168 * revert to IGMPv3. 2169 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2170 */ 2171 if (!V_igmp_v1enable) { 2172 CTR5(KTR_IGMPV3, 2173 "%s: transition from v%d -> v%d on %p(%s)", 2174 __func__, igi->igi_version, IGMP_VERSION_3, 2175 igi->igi_ifp, igi->igi_ifp->if_xname); 2176 igi->igi_v1_timer = 0; 2177 igi->igi_version = IGMP_VERSION_3; 2178 } else { 2179 --igi->igi_v1_timer; 2180 } 2181 if (igi->igi_v2_timer > 0) { 2182 CTR3(KTR_IGMPV3, 2183 "%s: cancel v2 timer on %p(%s)", 2184 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2185 igi->igi_v2_timer = 0; 2186 } 2187 } 2188 } 2189 2190 /* 2191 * Global slowtimo handler. 2192 * VIMAGE: Timeout handlers are expected to service all vimages. 2193 */ 2194 static struct callout igmpslow_callout; 2195 static void 2196 igmp_slowtimo(void *arg __unused) 2197 { 2198 struct epoch_tracker et; 2199 VNET_ITERATOR_DECL(vnet_iter); 2200 2201 NET_EPOCH_ENTER(et); 2202 VNET_LIST_RLOCK_NOSLEEP(); 2203 VNET_FOREACH(vnet_iter) { 2204 CURVNET_SET(vnet_iter); 2205 igmp_slowtimo_vnet(); 2206 CURVNET_RESTORE(); 2207 } 2208 VNET_LIST_RUNLOCK_NOSLEEP(); 2209 NET_EPOCH_EXIT(et); 2210 2211 callout_reset(&igmpslow_callout, hz / IGMP_SLOWHZ, igmp_slowtimo, NULL); 2212 } 2213 2214 /* 2215 * Per-vnet slowtimo handler. 2216 */ 2217 static void 2218 igmp_slowtimo_vnet(void) 2219 { 2220 struct igmp_ifsoftc *igi; 2221 2222 IGMP_LOCK(); 2223 2224 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2225 igmp_v1v2_process_querier_timers(igi); 2226 } 2227 2228 IGMP_UNLOCK(); 2229 } 2230 2231 /* 2232 * Dispatch an IGMPv1/v2 host report or leave message. 2233 * These are always small enough to fit inside a single mbuf. 2234 */ 2235 static int 2236 igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2237 { 2238 struct epoch_tracker et; 2239 struct ifnet *ifp; 2240 struct igmp *igmp; 2241 struct ip *ip; 2242 struct mbuf *m; 2243 2244 IN_MULTI_LIST_LOCK_ASSERT(); 2245 IGMP_LOCK_ASSERT(); 2246 2247 ifp = inm->inm_ifp; 2248 2249 m = m_gethdr(M_NOWAIT, MT_DATA); 2250 if (m == NULL) 2251 return (ENOMEM); 2252 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2253 2254 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2255 2256 m->m_data += sizeof(struct ip); 2257 m->m_len = sizeof(struct igmp); 2258 2259 igmp = mtod(m, struct igmp *); 2260 igmp->igmp_type = type; 2261 igmp->igmp_code = 0; 2262 igmp->igmp_group = inm->inm_addr; 2263 igmp->igmp_cksum = 0; 2264 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2265 2266 m->m_data -= sizeof(struct ip); 2267 m->m_len += sizeof(struct ip); 2268 2269 ip = mtod(m, struct ip *); 2270 ip->ip_tos = 0; 2271 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2272 ip->ip_off = 0; 2273 ip->ip_p = IPPROTO_IGMP; 2274 ip->ip_src.s_addr = INADDR_ANY; 2275 2276 if (type == IGMP_HOST_LEAVE_MESSAGE) 2277 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2278 else 2279 ip->ip_dst = inm->inm_addr; 2280 2281 igmp_save_context(m, ifp); 2282 2283 m->m_flags |= M_IGMPV2; 2284 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2285 m->m_flags |= M_IGMP_LOOP; 2286 2287 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2288 NET_EPOCH_ENTER(et); 2289 netisr_dispatch(NETISR_IGMP, m); 2290 NET_EPOCH_EXIT(et); 2291 2292 return (0); 2293 } 2294 2295 /* 2296 * Process a state change from the upper layer for the given IPv4 group. 2297 * 2298 * Each socket holds a reference on the in_multi in its own ip_moptions. 2299 * The socket layer will have made the necessary updates to.the group 2300 * state, it is now up to IGMP to issue a state change report if there 2301 * has been any change between T0 (when the last state-change was issued) 2302 * and T1 (now). 2303 * 2304 * We use the IGMPv3 state machine at group level. The IGMP module 2305 * however makes the decision as to which IGMP protocol version to speak. 2306 * A state change *from* INCLUDE {} always means an initial join. 2307 * A state change *to* INCLUDE {} always means a final leave. 2308 * 2309 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2310 * save ourselves a bunch of work; any exclusive mode groups need not 2311 * compute source filter lists. 2312 * 2313 * VIMAGE: curvnet should have been set by caller, as this routine 2314 * is called from the socket option handlers. 2315 */ 2316 int 2317 igmp_change_state(struct in_multi *inm) 2318 { 2319 struct igmp_ifsoftc *igi; 2320 struct ifnet *ifp; 2321 int error; 2322 2323 error = 0; 2324 IN_MULTI_LOCK_ASSERT(); 2325 /* 2326 * Try to detect if the upper layer just asked us to change state 2327 * for an interface which has now gone away. 2328 */ 2329 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2330 ifp = inm->inm_ifma->ifma_ifp; 2331 if (ifp == NULL) 2332 return (0); 2333 /* 2334 * Sanity check that netinet's notion of ifp is the 2335 * same as net's. 2336 */ 2337 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2338 2339 IGMP_LOCK(); 2340 2341 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2342 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2343 2344 /* 2345 * If we detect a state transition to or from MCAST_UNDEFINED 2346 * for this group, then we are starting or finishing an IGMP 2347 * life cycle for this group. 2348 */ 2349 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2350 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2351 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2352 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2353 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2354 error = igmp_initial_join(inm, igi); 2355 goto out_locked; 2356 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2357 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2358 igmp_final_leave(inm, igi); 2359 goto out_locked; 2360 } 2361 } else { 2362 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2363 } 2364 2365 error = igmp_handle_state_change(inm, igi); 2366 2367 out_locked: 2368 IGMP_UNLOCK(); 2369 return (error); 2370 } 2371 2372 /* 2373 * Perform the initial join for an IGMP group. 2374 * 2375 * When joining a group: 2376 * If the group should have its IGMP traffic suppressed, do nothing. 2377 * IGMPv1 starts sending IGMPv1 host membership reports. 2378 * IGMPv2 starts sending IGMPv2 host membership reports. 2379 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2380 * initial state of the membership. 2381 */ 2382 static int 2383 igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2384 { 2385 struct ifnet *ifp; 2386 struct mbufq *mq; 2387 int error, retval, syncstates; 2388 2389 CTR4(KTR_IGMPV3, "%s: initial join 0x%08x on ifp %p(%s)", __func__, 2390 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2391 2392 error = 0; 2393 syncstates = 1; 2394 2395 ifp = inm->inm_ifp; 2396 2397 IN_MULTI_LOCK_ASSERT(); 2398 IGMP_LOCK_ASSERT(); 2399 2400 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2401 2402 /* 2403 * Groups joined on loopback or marked as 'not reported', 2404 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2405 * are never reported in any IGMP protocol exchanges. 2406 * All other groups enter the appropriate IGMP state machine 2407 * for the version in use on this link. 2408 * A link marked as IGIF_SILENT causes IGMP to be completely 2409 * disabled for the link. 2410 */ 2411 if ((ifp->if_flags & IFF_LOOPBACK) || 2412 (igi->igi_flags & IGIF_SILENT) || 2413 !igmp_isgroupreported(inm->inm_addr)) { 2414 CTR1(KTR_IGMPV3, 2415 "%s: not kicking state machine for silent group", __func__); 2416 inm->inm_state = IGMP_SILENT_MEMBER; 2417 inm->inm_timer = 0; 2418 } else { 2419 /* 2420 * Deal with overlapping in_multi lifecycle. 2421 * If this group was LEAVING, then make sure 2422 * we drop the reference we picked up to keep the 2423 * group around for the final INCLUDE {} enqueue. 2424 */ 2425 if (igi->igi_version == IGMP_VERSION_3 && 2426 inm->inm_state == IGMP_LEAVING_MEMBER) { 2427 MPASS(inm->inm_refcount > 1); 2428 inm_rele_locked(NULL, inm); 2429 } 2430 inm->inm_state = IGMP_REPORTING_MEMBER; 2431 2432 switch (igi->igi_version) { 2433 case IGMP_VERSION_1: 2434 case IGMP_VERSION_2: 2435 inm->inm_state = IGMP_IDLE_MEMBER; 2436 error = igmp_v1v2_queue_report(inm, 2437 (igi->igi_version == IGMP_VERSION_2) ? 2438 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2439 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2440 if (error == 0) { 2441 inm->inm_timer = IGMP_RANDOM_DELAY( 2442 IGMP_V1V2_MAX_RI * IGMP_FASTHZ); 2443 V_current_state_timers_running = 1; 2444 } 2445 break; 2446 2447 case IGMP_VERSION_3: 2448 /* 2449 * Defer update of T0 to T1, until the first copy 2450 * of the state change has been transmitted. 2451 */ 2452 syncstates = 0; 2453 2454 /* 2455 * Immediately enqueue a State-Change Report for 2456 * this interface, freeing any previous reports. 2457 * Don't kick the timers if there is nothing to do, 2458 * or if an error occurred. 2459 */ 2460 mq = &inm->inm_scq; 2461 mbufq_drain(mq); 2462 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2463 0, 0); 2464 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2465 __func__, retval); 2466 if (retval <= 0) { 2467 error = retval * -1; 2468 break; 2469 } 2470 2471 /* 2472 * Schedule transmission of pending state-change 2473 * report up to RV times for this link. The timer 2474 * will fire at the next igmp_fasttimo (~200ms), 2475 * giving us an opportunity to merge the reports. 2476 */ 2477 if (igi->igi_flags & IGIF_LOOPBACK) { 2478 inm->inm_scrv = 1; 2479 } else { 2480 KASSERT(igi->igi_rv > 1, 2481 ("%s: invalid robustness %d", __func__, 2482 igi->igi_rv)); 2483 inm->inm_scrv = igi->igi_rv; 2484 } 2485 inm->inm_sctimer = 1; 2486 V_state_change_timers_running = 1; 2487 2488 error = 0; 2489 break; 2490 } 2491 } 2492 2493 /* 2494 * Only update the T0 state if state change is atomic, 2495 * i.e. we don't need to wait for a timer to fire before we 2496 * can consider the state change to have been communicated. 2497 */ 2498 if (syncstates) { 2499 inm_commit(inm); 2500 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2501 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2502 } 2503 2504 return (error); 2505 } 2506 2507 /* 2508 * Issue an intermediate state change during the IGMP life-cycle. 2509 */ 2510 static int 2511 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2512 { 2513 struct ifnet *ifp; 2514 int retval; 2515 2516 CTR4(KTR_IGMPV3, "%s: state change for 0x%08x on ifp %p(%s)", __func__, 2517 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2518 2519 ifp = inm->inm_ifp; 2520 2521 IN_MULTI_LIST_LOCK_ASSERT(); 2522 IGMP_LOCK_ASSERT(); 2523 2524 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2525 2526 if ((ifp->if_flags & IFF_LOOPBACK) || 2527 (igi->igi_flags & IGIF_SILENT) || 2528 !igmp_isgroupreported(inm->inm_addr) || 2529 (igi->igi_version != IGMP_VERSION_3)) { 2530 if (!igmp_isgroupreported(inm->inm_addr)) { 2531 CTR1(KTR_IGMPV3, 2532 "%s: not kicking state machine for silent group", __func__); 2533 } 2534 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2535 inm_commit(inm); 2536 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2537 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2538 return (0); 2539 } 2540 2541 mbufq_drain(&inm->inm_scq); 2542 2543 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2544 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2545 if (retval <= 0) 2546 return (-retval); 2547 2548 /* 2549 * If record(s) were enqueued, start the state-change 2550 * report timer for this group. 2551 */ 2552 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2553 inm->inm_sctimer = 1; 2554 V_state_change_timers_running = 1; 2555 2556 return (0); 2557 } 2558 2559 /* 2560 * Perform the final leave for an IGMP group. 2561 * 2562 * When leaving a group: 2563 * IGMPv1 does nothing. 2564 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2565 * IGMPv3 enqueues a state-change report containing a transition 2566 * to INCLUDE {} for immediate transmission. 2567 */ 2568 static void 2569 igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2570 { 2571 int syncstates; 2572 2573 syncstates = 1; 2574 2575 CTR4(KTR_IGMPV3, "%s: final leave 0x%08x on ifp %p(%s)", 2576 __func__, ntohl(inm->inm_addr.s_addr), inm->inm_ifp, 2577 inm->inm_ifp->if_xname); 2578 2579 IN_MULTI_LIST_LOCK_ASSERT(); 2580 IGMP_LOCK_ASSERT(); 2581 2582 switch (inm->inm_state) { 2583 case IGMP_NOT_MEMBER: 2584 case IGMP_SILENT_MEMBER: 2585 case IGMP_LEAVING_MEMBER: 2586 /* Already leaving or left; do nothing. */ 2587 CTR1(KTR_IGMPV3, 2588 "%s: not kicking state machine for silent group", __func__); 2589 break; 2590 case IGMP_REPORTING_MEMBER: 2591 case IGMP_IDLE_MEMBER: 2592 case IGMP_G_QUERY_PENDING_MEMBER: 2593 case IGMP_SG_QUERY_PENDING_MEMBER: 2594 if (igi->igi_version == IGMP_VERSION_2) { 2595 #ifdef INVARIANTS 2596 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2597 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2598 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2599 __func__); 2600 #endif 2601 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2602 inm->inm_state = IGMP_NOT_MEMBER; 2603 } else if (igi->igi_version == IGMP_VERSION_3) { 2604 /* 2605 * Stop group timer and all pending reports. 2606 * Immediately enqueue a state-change report 2607 * TO_IN {} to be sent on the next fast timeout, 2608 * giving us an opportunity to merge reports. 2609 */ 2610 mbufq_drain(&inm->inm_scq); 2611 inm->inm_timer = 0; 2612 if (igi->igi_flags & IGIF_LOOPBACK) { 2613 inm->inm_scrv = 1; 2614 } else { 2615 inm->inm_scrv = igi->igi_rv; 2616 } 2617 CTR4(KTR_IGMPV3, "%s: Leaving 0x%08x/%s with %d " 2618 "pending retransmissions.", __func__, 2619 ntohl(inm->inm_addr.s_addr), 2620 inm->inm_ifp->if_xname, inm->inm_scrv); 2621 if (inm->inm_scrv == 0) { 2622 inm->inm_state = IGMP_NOT_MEMBER; 2623 inm->inm_sctimer = 0; 2624 } else { 2625 int retval __unused; 2626 2627 inm_acquire_locked(inm); 2628 2629 retval = igmp_v3_enqueue_group_record( 2630 &inm->inm_scq, inm, 1, 0, 0); 2631 KASSERT(retval != 0, 2632 ("%s: enqueue record = %d", __func__, 2633 retval)); 2634 2635 inm->inm_state = IGMP_LEAVING_MEMBER; 2636 inm->inm_sctimer = 1; 2637 V_state_change_timers_running = 1; 2638 syncstates = 0; 2639 } 2640 break; 2641 } 2642 break; 2643 case IGMP_LAZY_MEMBER: 2644 case IGMP_SLEEPING_MEMBER: 2645 case IGMP_AWAKENING_MEMBER: 2646 /* Our reports are suppressed; do nothing. */ 2647 break; 2648 } 2649 2650 if (syncstates) { 2651 inm_commit(inm); 2652 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2653 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2654 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2655 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for 0x%08x/%s", 2656 __func__, ntohl(inm->inm_addr.s_addr), 2657 inm->inm_ifp->if_xname); 2658 } 2659 } 2660 2661 /* 2662 * Enqueue an IGMPv3 group record to the given output queue. 2663 * 2664 * XXX This function could do with having the allocation code 2665 * split out, and the multiple-tree-walks coalesced into a single 2666 * routine as has been done in igmp_v3_enqueue_filter_change(). 2667 * 2668 * If is_state_change is zero, a current-state record is appended. 2669 * If is_state_change is non-zero, a state-change report is appended. 2670 * 2671 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2672 * If is_group_query is zero, and if there is a packet with free space 2673 * at the tail of the queue, it will be appended to providing there 2674 * is enough free space. 2675 * Otherwise a new mbuf packet chain is allocated. 2676 * 2677 * If is_source_query is non-zero, each source is checked to see if 2678 * it was recorded for a Group-Source query, and will be omitted if 2679 * it is not both in-mode and recorded. 2680 * 2681 * The function will attempt to allocate leading space in the packet 2682 * for the IP/IGMP header to be prepended without fragmenting the chain. 2683 * 2684 * If successful the size of all data appended to the queue is returned, 2685 * otherwise an error code less than zero is returned, or zero if 2686 * no record(s) were appended. 2687 */ 2688 static int 2689 igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2690 const int is_state_change, const int is_group_query, 2691 const int is_source_query) 2692 { 2693 struct igmp_grouprec ig; 2694 struct igmp_grouprec *pig; 2695 struct ifnet *ifp; 2696 struct ip_msource *ims, *nims; 2697 struct mbuf *m0, *m, *md; 2698 int is_filter_list_change; 2699 int minrec0len, m0srcs, msrcs, nbytes, off; 2700 int record_has_sources; 2701 int now; 2702 int type; 2703 in_addr_t naddr; 2704 uint8_t mode; 2705 2706 IN_MULTI_LIST_LOCK_ASSERT(); 2707 2708 ifp = inm->inm_ifp; 2709 is_filter_list_change = 0; 2710 m = NULL; 2711 m0 = NULL; 2712 m0srcs = 0; 2713 msrcs = 0; 2714 nbytes = 0; 2715 nims = NULL; 2716 record_has_sources = 1; 2717 pig = NULL; 2718 type = IGMP_DO_NOTHING; 2719 mode = inm->inm_st[1].iss_fmode; 2720 2721 /* 2722 * If we did not transition out of ASM mode during t0->t1, 2723 * and there are no source nodes to process, we can skip 2724 * the generation of source records. 2725 */ 2726 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2727 inm->inm_nsrc == 0) 2728 record_has_sources = 0; 2729 2730 if (is_state_change) { 2731 /* 2732 * Queue a state change record. 2733 * If the mode did not change, and there are non-ASM 2734 * listeners or source filters present, 2735 * we potentially need to issue two records for the group. 2736 * If we are transitioning to MCAST_UNDEFINED, we need 2737 * not send any sources. 2738 * If there are ASM listeners, and there was no filter 2739 * mode transition of any kind, do nothing. 2740 */ 2741 if (mode != inm->inm_st[0].iss_fmode) { 2742 if (mode == MCAST_EXCLUDE) { 2743 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2744 __func__); 2745 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2746 } else { 2747 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2748 __func__); 2749 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2750 if (mode == MCAST_UNDEFINED) 2751 record_has_sources = 0; 2752 } 2753 } else { 2754 if (record_has_sources) { 2755 is_filter_list_change = 1; 2756 } else { 2757 type = IGMP_DO_NOTHING; 2758 } 2759 } 2760 } else { 2761 /* 2762 * Queue a current state record. 2763 */ 2764 if (mode == MCAST_EXCLUDE) { 2765 type = IGMP_MODE_IS_EXCLUDE; 2766 } else if (mode == MCAST_INCLUDE) { 2767 type = IGMP_MODE_IS_INCLUDE; 2768 KASSERT(inm->inm_st[1].iss_asm == 0, 2769 ("%s: inm %p is INCLUDE but ASM count is %d", 2770 __func__, inm, inm->inm_st[1].iss_asm)); 2771 } 2772 } 2773 2774 /* 2775 * Generate the filter list changes using a separate function. 2776 */ 2777 if (is_filter_list_change) 2778 return (igmp_v3_enqueue_filter_change(mq, inm)); 2779 2780 if (type == IGMP_DO_NOTHING) { 2781 CTR3(KTR_IGMPV3, "%s: nothing to do for 0x%08x/%s", __func__, 2782 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2783 return (0); 2784 } 2785 2786 /* 2787 * If any sources are present, we must be able to fit at least 2788 * one in the trailing space of the tail packet's mbuf, 2789 * ideally more. 2790 */ 2791 minrec0len = sizeof(struct igmp_grouprec); 2792 if (record_has_sources) 2793 minrec0len += sizeof(in_addr_t); 2794 2795 CTR4(KTR_IGMPV3, "%s: queueing %s for 0x%08x/%s", __func__, 2796 igmp_rec_type_to_str(type), ntohl(inm->inm_addr.s_addr), 2797 inm->inm_ifp->if_xname); 2798 2799 /* 2800 * Check if we have a packet in the tail of the queue for this 2801 * group into which the first group record for this group will fit. 2802 * Otherwise allocate a new packet. 2803 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2804 * Note: Group records for G/GSR query responses MUST be sent 2805 * in their own packet. 2806 */ 2807 m0 = mbufq_last(mq); 2808 if (!is_group_query && 2809 m0 != NULL && 2810 (m0->m_pkthdr.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2811 (m0->m_pkthdr.len + minrec0len) < 2812 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2813 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2814 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2815 m = m0; 2816 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2817 } else { 2818 if (mbufq_full(mq)) { 2819 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2820 return (-ENOMEM); 2821 } 2822 m = NULL; 2823 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2824 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2825 if (!is_state_change && !is_group_query) { 2826 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2827 if (m) 2828 m->m_data += IGMP_LEADINGSPACE; 2829 } 2830 if (m == NULL) { 2831 m = m_gethdr(M_NOWAIT, MT_DATA); 2832 if (m) 2833 M_ALIGN(m, IGMP_LEADINGSPACE); 2834 } 2835 if (m == NULL) 2836 return (-ENOMEM); 2837 2838 igmp_save_context(m, ifp); 2839 2840 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2841 } 2842 2843 /* 2844 * Append group record. 2845 * If we have sources, we don't know how many yet. 2846 */ 2847 ig.ig_type = type; 2848 ig.ig_datalen = 0; 2849 ig.ig_numsrc = 0; 2850 ig.ig_group = inm->inm_addr; 2851 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2852 if (m != m0) 2853 m_freem(m); 2854 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2855 return (-ENOMEM); 2856 } 2857 nbytes += sizeof(struct igmp_grouprec); 2858 2859 /* 2860 * Append as many sources as will fit in the first packet. 2861 * If we are appending to a new packet, the chain allocation 2862 * may potentially use clusters; use m_getptr() in this case. 2863 * If we are appending to an existing packet, we need to obtain 2864 * a pointer to the group record after m_append(), in case a new 2865 * mbuf was allocated. 2866 * Only append sources which are in-mode at t1. If we are 2867 * transitioning to MCAST_UNDEFINED state on the group, do not 2868 * include source entries. 2869 * Only report recorded sources in our filter set when responding 2870 * to a group-source query. 2871 */ 2872 if (record_has_sources) { 2873 if (m == m0) { 2874 md = m_last(m); 2875 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2876 md->m_len - nbytes); 2877 } else { 2878 md = m_getptr(m, 0, &off); 2879 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2880 off); 2881 } 2882 msrcs = 0; 2883 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2884 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2885 ims->ims_haddr); 2886 now = ims_get_mode(inm, ims, 1); 2887 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2888 if ((now != mode) || 2889 (now == mode && mode == MCAST_UNDEFINED)) { 2890 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2891 continue; 2892 } 2893 if (is_source_query && ims->ims_stp == 0) { 2894 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2895 __func__); 2896 continue; 2897 } 2898 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2899 naddr = htonl(ims->ims_haddr); 2900 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2901 if (m != m0) 2902 m_freem(m); 2903 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2904 __func__); 2905 return (-ENOMEM); 2906 } 2907 nbytes += sizeof(in_addr_t); 2908 ++msrcs; 2909 if (msrcs == m0srcs) 2910 break; 2911 } 2912 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2913 msrcs); 2914 pig->ig_numsrc = htons(msrcs); 2915 nbytes += (msrcs * sizeof(in_addr_t)); 2916 } 2917 2918 if (is_source_query && msrcs == 0) { 2919 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2920 if (m != m0) 2921 m_freem(m); 2922 return (0); 2923 } 2924 2925 /* 2926 * We are good to go with first packet. 2927 */ 2928 if (m != m0) { 2929 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2930 m->m_pkthdr.vt_nrecs = 1; 2931 mbufq_enqueue(mq, m); 2932 } else 2933 m->m_pkthdr.vt_nrecs++; 2934 2935 /* 2936 * No further work needed if no source list in packet(s). 2937 */ 2938 if (!record_has_sources) 2939 return (nbytes); 2940 2941 /* 2942 * Whilst sources remain to be announced, we need to allocate 2943 * a new packet and fill out as many sources as will fit. 2944 * Always try for a cluster first. 2945 */ 2946 while (nims != NULL) { 2947 if (mbufq_full(mq)) { 2948 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2949 return (-ENOMEM); 2950 } 2951 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2952 if (m) 2953 m->m_data += IGMP_LEADINGSPACE; 2954 if (m == NULL) { 2955 m = m_gethdr(M_NOWAIT, MT_DATA); 2956 if (m) 2957 M_ALIGN(m, IGMP_LEADINGSPACE); 2958 } 2959 if (m == NULL) 2960 return (-ENOMEM); 2961 igmp_save_context(m, ifp); 2962 md = m_getptr(m, 0, &off); 2963 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2964 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2965 2966 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2967 if (m != m0) 2968 m_freem(m); 2969 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2970 return (-ENOMEM); 2971 } 2972 m->m_pkthdr.vt_nrecs = 1; 2973 nbytes += sizeof(struct igmp_grouprec); 2974 2975 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2976 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2977 2978 msrcs = 0; 2979 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2980 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2981 ims->ims_haddr); 2982 now = ims_get_mode(inm, ims, 1); 2983 if ((now != mode) || 2984 (now == mode && mode == MCAST_UNDEFINED)) { 2985 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2986 continue; 2987 } 2988 if (is_source_query && ims->ims_stp == 0) { 2989 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2990 __func__); 2991 continue; 2992 } 2993 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2994 naddr = htonl(ims->ims_haddr); 2995 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2996 if (m != m0) 2997 m_freem(m); 2998 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2999 __func__); 3000 return (-ENOMEM); 3001 } 3002 ++msrcs; 3003 if (msrcs == m0srcs) 3004 break; 3005 } 3006 pig->ig_numsrc = htons(msrcs); 3007 nbytes += (msrcs * sizeof(in_addr_t)); 3008 3009 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 3010 mbufq_enqueue(mq, m); 3011 } 3012 3013 return (nbytes); 3014 } 3015 3016 /* 3017 * Type used to mark record pass completion. 3018 * We exploit the fact we can cast to this easily from the 3019 * current filter modes on each ip_msource node. 3020 */ 3021 typedef enum { 3022 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 3023 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 3024 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 3025 REC_FULL = REC_ALLOW | REC_BLOCK 3026 } rectype_t; 3027 3028 /* 3029 * Enqueue an IGMPv3 filter list change to the given output queue. 3030 * 3031 * Source list filter state is held in an RB-tree. When the filter list 3032 * for a group is changed without changing its mode, we need to compute 3033 * the deltas between T0 and T1 for each source in the filter set, 3034 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 3035 * 3036 * As we may potentially queue two record types, and the entire R-B tree 3037 * needs to be walked at once, we break this out into its own function 3038 * so we can generate a tightly packed queue of packets. 3039 * 3040 * XXX This could be written to only use one tree walk, although that makes 3041 * serializing into the mbuf chains a bit harder. For now we do two walks 3042 * which makes things easier on us, and it may or may not be harder on 3043 * the L2 cache. 3044 * 3045 * If successful the size of all data appended to the queue is returned, 3046 * otherwise an error code less than zero is returned, or zero if 3047 * no record(s) were appended. 3048 */ 3049 static int 3050 igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3051 { 3052 static const int MINRECLEN = 3053 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3054 struct ifnet *ifp; 3055 struct igmp_grouprec ig; 3056 struct igmp_grouprec *pig; 3057 struct ip_msource *ims, *nims; 3058 struct mbuf *m, *m0, *md; 3059 in_addr_t naddr; 3060 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3061 #ifdef KTR 3062 int nallow, nblock; 3063 #endif 3064 uint8_t mode, now, then; 3065 rectype_t crt, drt, nrt; 3066 3067 IN_MULTI_LIST_LOCK_ASSERT(); 3068 3069 if (inm->inm_nsrc == 0 || 3070 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3071 return (0); 3072 3073 ifp = inm->inm_ifp; /* interface */ 3074 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3075 crt = REC_NONE; /* current group record type */ 3076 drt = REC_NONE; /* mask of completed group record types */ 3077 nrt = REC_NONE; /* record type for current node */ 3078 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3079 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3080 npbytes = 0; /* # of bytes appended this packet */ 3081 rsrcs = 0; /* # sources encoded in current record */ 3082 schanged = 0; /* # nodes encoded in overall filter change */ 3083 #ifdef KTR 3084 nallow = 0; /* # of source entries in ALLOW_NEW */ 3085 nblock = 0; /* # of source entries in BLOCK_OLD */ 3086 #endif 3087 nims = NULL; /* next tree node pointer */ 3088 3089 /* 3090 * For each possible filter record mode. 3091 * The first kind of source we encounter tells us which 3092 * is the first kind of record we start appending. 3093 * If a node transitioned to UNDEFINED at t1, its mode is treated 3094 * as the inverse of the group's filter mode. 3095 */ 3096 while (drt != REC_FULL) { 3097 do { 3098 m0 = mbufq_last(mq); 3099 if (m0 != NULL && 3100 (m0->m_pkthdr.vt_nrecs + 1 <= 3101 IGMP_V3_REPORT_MAXRECS) && 3102 (m0->m_pkthdr.len + MINRECLEN) < 3103 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3104 m = m0; 3105 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3106 sizeof(struct igmp_grouprec)) / 3107 sizeof(in_addr_t); 3108 CTR1(KTR_IGMPV3, 3109 "%s: use previous packet", __func__); 3110 } else { 3111 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3112 if (m) 3113 m->m_data += IGMP_LEADINGSPACE; 3114 if (m == NULL) { 3115 m = m_gethdr(M_NOWAIT, MT_DATA); 3116 if (m) 3117 M_ALIGN(m, IGMP_LEADINGSPACE); 3118 } 3119 if (m == NULL) { 3120 CTR1(KTR_IGMPV3, 3121 "%s: m_get*() failed", __func__); 3122 return (-ENOMEM); 3123 } 3124 m->m_pkthdr.vt_nrecs = 0; 3125 igmp_save_context(m, ifp); 3126 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3127 sizeof(struct igmp_grouprec)) / 3128 sizeof(in_addr_t); 3129 npbytes = 0; 3130 CTR1(KTR_IGMPV3, 3131 "%s: allocated new packet", __func__); 3132 } 3133 /* 3134 * Append the IGMP group record header to the 3135 * current packet's data area. 3136 * Recalculate pointer to free space for next 3137 * group record, in case m_append() allocated 3138 * a new mbuf or cluster. 3139 */ 3140 memset(&ig, 0, sizeof(ig)); 3141 ig.ig_group = inm->inm_addr; 3142 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3143 if (m != m0) 3144 m_freem(m); 3145 CTR1(KTR_IGMPV3, 3146 "%s: m_append() failed", __func__); 3147 return (-ENOMEM); 3148 } 3149 npbytes += sizeof(struct igmp_grouprec); 3150 if (m != m0) { 3151 /* new packet; offset in c hain */ 3152 md = m_getptr(m, npbytes - 3153 sizeof(struct igmp_grouprec), &off); 3154 pig = (struct igmp_grouprec *)(mtod(md, 3155 uint8_t *) + off); 3156 } else { 3157 /* current packet; offset from last append */ 3158 md = m_last(m); 3159 pig = (struct igmp_grouprec *)(mtod(md, 3160 uint8_t *) + md->m_len - 3161 sizeof(struct igmp_grouprec)); 3162 } 3163 /* 3164 * Begin walking the tree for this record type 3165 * pass, or continue from where we left off 3166 * previously if we had to allocate a new packet. 3167 * Only report deltas in-mode at t1. 3168 * We need not report included sources as allowed 3169 * if we are in inclusive mode on the group, 3170 * however the converse is not true. 3171 */ 3172 rsrcs = 0; 3173 if (nims == NULL) 3174 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3175 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3176 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", 3177 __func__, ims->ims_haddr); 3178 now = ims_get_mode(inm, ims, 1); 3179 then = ims_get_mode(inm, ims, 0); 3180 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3181 __func__, then, now); 3182 if (now == then) { 3183 CTR1(KTR_IGMPV3, 3184 "%s: skip unchanged", __func__); 3185 continue; 3186 } 3187 if (mode == MCAST_EXCLUDE && 3188 now == MCAST_INCLUDE) { 3189 CTR1(KTR_IGMPV3, 3190 "%s: skip IN src on EX group", 3191 __func__); 3192 continue; 3193 } 3194 nrt = (rectype_t)now; 3195 if (nrt == REC_NONE) 3196 nrt = (rectype_t)(~mode & REC_FULL); 3197 if (schanged++ == 0) { 3198 crt = nrt; 3199 } else if (crt != nrt) 3200 continue; 3201 naddr = htonl(ims->ims_haddr); 3202 if (!m_append(m, sizeof(in_addr_t), 3203 (void *)&naddr)) { 3204 if (m != m0) 3205 m_freem(m); 3206 CTR1(KTR_IGMPV3, 3207 "%s: m_append() failed", __func__); 3208 return (-ENOMEM); 3209 } 3210 #ifdef KTR 3211 nallow += !!(crt == REC_ALLOW); 3212 nblock += !!(crt == REC_BLOCK); 3213 #endif 3214 if (++rsrcs == m0srcs) 3215 break; 3216 } 3217 /* 3218 * If we did not append any tree nodes on this 3219 * pass, back out of allocations. 3220 */ 3221 if (rsrcs == 0) { 3222 npbytes -= sizeof(struct igmp_grouprec); 3223 if (m != m0) { 3224 CTR1(KTR_IGMPV3, 3225 "%s: m_free(m)", __func__); 3226 m_freem(m); 3227 } else { 3228 CTR1(KTR_IGMPV3, 3229 "%s: m_adj(m, -ig)", __func__); 3230 m_adj(m, -((int)sizeof( 3231 struct igmp_grouprec))); 3232 } 3233 continue; 3234 } 3235 npbytes += (rsrcs * sizeof(in_addr_t)); 3236 if (crt == REC_ALLOW) 3237 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3238 else if (crt == REC_BLOCK) 3239 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3240 pig->ig_numsrc = htons(rsrcs); 3241 /* 3242 * Count the new group record, and enqueue this 3243 * packet if it wasn't already queued. 3244 */ 3245 m->m_pkthdr.vt_nrecs++; 3246 if (m != m0) 3247 mbufq_enqueue(mq, m); 3248 nbytes += npbytes; 3249 } while (nims != NULL); 3250 drt |= crt; 3251 crt = (~crt & REC_FULL); 3252 } 3253 3254 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3255 nallow, nblock); 3256 3257 return (nbytes); 3258 } 3259 3260 static int 3261 igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3262 { 3263 struct mbufq *gq; 3264 struct mbuf *m; /* pending state-change */ 3265 struct mbuf *m0; /* copy of pending state-change */ 3266 struct mbuf *mt; /* last state-change in packet */ 3267 int docopy, domerge; 3268 u_int recslen; 3269 3270 docopy = 0; 3271 domerge = 0; 3272 recslen = 0; 3273 3274 IN_MULTI_LIST_LOCK_ASSERT(); 3275 IGMP_LOCK_ASSERT(); 3276 3277 /* 3278 * If there are further pending retransmissions, make a writable 3279 * copy of each queued state-change message before merging. 3280 */ 3281 if (inm->inm_scrv > 0) 3282 docopy = 1; 3283 3284 gq = &inm->inm_scq; 3285 #ifdef KTR 3286 if (mbufq_first(gq) == NULL) { 3287 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3288 __func__, inm); 3289 } 3290 #endif 3291 3292 m = mbufq_first(gq); 3293 while (m != NULL) { 3294 /* 3295 * Only merge the report into the current packet if 3296 * there is sufficient space to do so; an IGMPv3 report 3297 * packet may only contain 65,535 group records. 3298 * Always use a simple mbuf chain concatentation to do this, 3299 * as large state changes for single groups may have 3300 * allocated clusters. 3301 */ 3302 domerge = 0; 3303 mt = mbufq_last(scq); 3304 if (mt != NULL) { 3305 recslen = m_length(m, NULL); 3306 3307 if ((mt->m_pkthdr.vt_nrecs + 3308 m->m_pkthdr.vt_nrecs <= 3309 IGMP_V3_REPORT_MAXRECS) && 3310 (mt->m_pkthdr.len + recslen <= 3311 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3312 domerge = 1; 3313 } 3314 3315 if (!domerge && mbufq_full(gq)) { 3316 CTR2(KTR_IGMPV3, 3317 "%s: outbound queue full, skipping whole packet %p", 3318 __func__, m); 3319 mt = m->m_nextpkt; 3320 if (!docopy) 3321 m_freem(m); 3322 m = mt; 3323 continue; 3324 } 3325 3326 if (!docopy) { 3327 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3328 m0 = mbufq_dequeue(gq); 3329 m = m0->m_nextpkt; 3330 } else { 3331 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3332 m0 = m_dup(m, M_NOWAIT); 3333 if (m0 == NULL) 3334 return (ENOMEM); 3335 m0->m_nextpkt = NULL; 3336 m = m->m_nextpkt; 3337 } 3338 3339 if (!domerge) { 3340 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3341 __func__, m0, scq); 3342 mbufq_enqueue(scq, m0); 3343 } else { 3344 struct mbuf *mtl; /* last mbuf of packet mt */ 3345 3346 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3347 __func__, m0, mt); 3348 3349 mtl = m_last(mt); 3350 m0->m_flags &= ~M_PKTHDR; 3351 mt->m_pkthdr.len += recslen; 3352 mt->m_pkthdr.vt_nrecs += 3353 m0->m_pkthdr.vt_nrecs; 3354 3355 mtl->m_next = m0; 3356 } 3357 } 3358 3359 return (0); 3360 } 3361 3362 /* 3363 * Respond to a pending IGMPv3 General Query. 3364 */ 3365 static void 3366 igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3367 { 3368 struct ifmultiaddr *ifma; 3369 struct ifnet *ifp; 3370 struct in_multi *inm; 3371 int retval __unused, loop; 3372 3373 IN_MULTI_LIST_LOCK_ASSERT(); 3374 IGMP_LOCK_ASSERT(); 3375 NET_EPOCH_ASSERT(); 3376 3377 KASSERT(igi->igi_version == IGMP_VERSION_3, 3378 ("%s: called when version %d", __func__, igi->igi_version)); 3379 3380 /* 3381 * Check that there are some packets queued. If so, send them first. 3382 * For large number of groups the reply to general query can take 3383 * many packets, we should finish sending them before starting of 3384 * queuing the new reply. 3385 */ 3386 if (mbufq_len(&igi->igi_gq) != 0) 3387 goto send; 3388 3389 ifp = igi->igi_ifp; 3390 3391 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3392 inm = inm_ifmultiaddr_get_inm(ifma); 3393 if (inm == NULL) 3394 continue; 3395 KASSERT(ifp == inm->inm_ifp, 3396 ("%s: inconsistent ifp", __func__)); 3397 3398 switch (inm->inm_state) { 3399 case IGMP_NOT_MEMBER: 3400 case IGMP_SILENT_MEMBER: 3401 break; 3402 case IGMP_REPORTING_MEMBER: 3403 case IGMP_IDLE_MEMBER: 3404 case IGMP_LAZY_MEMBER: 3405 case IGMP_SLEEPING_MEMBER: 3406 case IGMP_AWAKENING_MEMBER: 3407 inm->inm_state = IGMP_REPORTING_MEMBER; 3408 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3409 inm, 0, 0, 0); 3410 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3411 __func__, retval); 3412 break; 3413 case IGMP_G_QUERY_PENDING_MEMBER: 3414 case IGMP_SG_QUERY_PENDING_MEMBER: 3415 case IGMP_LEAVING_MEMBER: 3416 break; 3417 } 3418 } 3419 3420 send: 3421 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3422 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3423 3424 /* 3425 * Slew transmission of bursts over 500ms intervals. 3426 */ 3427 if (mbufq_first(&igi->igi_gq) != NULL) { 3428 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3429 IGMP_RESPONSE_BURST_INTERVAL); 3430 V_interface_timers_running = 1; 3431 } 3432 } 3433 3434 /* 3435 * Transmit the next pending IGMP message in the output queue. 3436 * 3437 * We get called from netisr_processqueue(). A mutex private to igmpoq 3438 * will be acquired and released around this routine. 3439 * 3440 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3441 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3442 * a link and uses a link-scope multicast address. 3443 */ 3444 static void 3445 igmp_intr(struct mbuf *m) 3446 { 3447 struct ip_moptions imo; 3448 struct ifnet *ifp; 3449 struct mbuf *ipopts, *m0; 3450 int error; 3451 uint32_t ifindex; 3452 3453 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3454 3455 /* 3456 * Set VNET image pointer from enqueued mbuf chain 3457 * before doing anything else. Whilst we use interface 3458 * indexes to guard against interface detach, they are 3459 * unique to each VIMAGE and must be retrieved. 3460 */ 3461 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3462 ifindex = igmp_restore_context(m); 3463 3464 /* 3465 * Check if the ifnet still exists. This limits the scope of 3466 * any race in the absence of a global ifp lock for low cost 3467 * (an array lookup). 3468 */ 3469 ifp = ifnet_byindex(ifindex); 3470 if (ifp == NULL) { 3471 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3472 __func__, m, ifindex); 3473 m_freem(m); 3474 IPSTAT_INC(ips_noroute); 3475 goto out; 3476 } 3477 3478 ipopts = V_igmp_sendra ? m_raopt : NULL; 3479 3480 imo.imo_multicast_ttl = 1; 3481 imo.imo_multicast_vif = -1; 3482 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3483 3484 /* 3485 * If the user requested that IGMP traffic be explicitly 3486 * redirected to the loopback interface (e.g. they are running a 3487 * MANET interface and the routing protocol needs to see the 3488 * updates), handle this now. 3489 */ 3490 if (m->m_flags & M_IGMP_LOOP) 3491 imo.imo_multicast_ifp = V_loif; 3492 else 3493 imo.imo_multicast_ifp = ifp; 3494 3495 if (m->m_flags & M_IGMPV2) { 3496 m0 = m; 3497 } else { 3498 m0 = igmp_v3_encap_report(ifp, m); 3499 if (m0 == NULL) { 3500 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3501 m_freem(m); 3502 IPSTAT_INC(ips_odropped); 3503 goto out; 3504 } 3505 } 3506 3507 igmp_scrub_context(m0); 3508 m_clrprotoflags(m); 3509 m0->m_pkthdr.rcvif = V_loif; 3510 #ifdef MAC 3511 mac_netinet_igmp_send(ifp, m0); 3512 #endif 3513 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3514 if (error) { 3515 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3516 goto out; 3517 } 3518 3519 IGMPSTAT_INC(igps_snd_reports); 3520 3521 out: 3522 /* 3523 * We must restore the existing vnet pointer before 3524 * continuing as we are run from netisr context. 3525 */ 3526 CURVNET_RESTORE(); 3527 } 3528 3529 /* 3530 * Encapsulate an IGMPv3 report. 3531 * 3532 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3533 * chain has already had its IP/IGMPv3 header prepended. In this case 3534 * the function will not attempt to prepend; the lengths and checksums 3535 * will however be re-computed. 3536 * 3537 * Returns a pointer to the new mbuf chain head, or NULL if the 3538 * allocation failed. 3539 */ 3540 static struct mbuf * 3541 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3542 { 3543 struct igmp_report *igmp; 3544 struct ip *ip; 3545 int hdrlen, igmpreclen; 3546 3547 KASSERT((m->m_flags & M_PKTHDR), 3548 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3549 3550 igmpreclen = m_length(m, NULL); 3551 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); 3552 3553 if (m->m_flags & M_IGMPV3_HDR) { 3554 igmpreclen -= hdrlen; 3555 } else { 3556 M_PREPEND(m, hdrlen, M_NOWAIT); 3557 if (m == NULL) 3558 return (NULL); 3559 m->m_flags |= M_IGMPV3_HDR; 3560 } 3561 3562 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen); 3563 3564 m->m_data += sizeof(struct ip); 3565 m->m_len -= sizeof(struct ip); 3566 3567 igmp = mtod(m, struct igmp_report *); 3568 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; 3569 igmp->ir_rsv1 = 0; 3570 igmp->ir_rsv2 = 0; 3571 igmp->ir_numgrps = htons(m->m_pkthdr.vt_nrecs); 3572 igmp->ir_cksum = 0; 3573 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3574 m->m_pkthdr.vt_nrecs = 0; 3575 3576 m->m_data -= sizeof(struct ip); 3577 m->m_len += sizeof(struct ip); 3578 3579 ip = mtod(m, struct ip *); 3580 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; 3581 ip->ip_len = htons(hdrlen + igmpreclen); 3582 ip->ip_off = htons(IP_DF); 3583 ip->ip_p = IPPROTO_IGMP; 3584 ip->ip_sum = 0; 3585 3586 ip->ip_src.s_addr = INADDR_ANY; 3587 3588 if (m->m_flags & M_IGMP_LOOP) { 3589 struct in_ifaddr *ia; 3590 3591 IFP_TO_IA(ifp, ia); 3592 if (ia != NULL) 3593 ip->ip_src = ia->ia_addr.sin_addr; 3594 } 3595 3596 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); 3597 3598 return (m); 3599 } 3600 3601 #ifdef KTR 3602 static char * 3603 igmp_rec_type_to_str(const int type) 3604 { 3605 3606 switch (type) { 3607 case IGMP_CHANGE_TO_EXCLUDE_MODE: 3608 return "TO_EX"; 3609 break; 3610 case IGMP_CHANGE_TO_INCLUDE_MODE: 3611 return "TO_IN"; 3612 break; 3613 case IGMP_MODE_IS_EXCLUDE: 3614 return "MODE_EX"; 3615 break; 3616 case IGMP_MODE_IS_INCLUDE: 3617 return "MODE_IN"; 3618 break; 3619 case IGMP_ALLOW_NEW_SOURCES: 3620 return "ALLOW_NEW"; 3621 break; 3622 case IGMP_BLOCK_OLD_SOURCES: 3623 return "BLOCK_OLD"; 3624 break; 3625 default: 3626 break; 3627 } 3628 return "unknown"; 3629 } 3630 #endif 3631 3632 #ifdef VIMAGE 3633 static void 3634 vnet_igmp_init(const void *unused __unused) 3635 { 3636 3637 netisr_register_vnet(&igmp_nh); 3638 } 3639 VNET_SYSINIT(vnet_igmp_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3640 vnet_igmp_init, NULL); 3641 3642 static void 3643 vnet_igmp_uninit(const void *unused __unused) 3644 { 3645 3646 /* This can happen when we shutdown the entire network stack. */ 3647 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3648 3649 netisr_unregister_vnet(&igmp_nh); 3650 } 3651 VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3652 vnet_igmp_uninit, NULL); 3653 #endif 3654 3655 #ifdef DDB 3656 DB_SHOW_COMMAND(igi_list, db_show_igi_list) 3657 { 3658 struct igmp_ifsoftc *igi, *tigi; 3659 LIST_HEAD(_igi_list, igmp_ifsoftc) *igi_head; 3660 3661 if (!have_addr) { 3662 db_printf("usage: show igi_list <addr>\n"); 3663 return; 3664 } 3665 igi_head = (struct _igi_list *)addr; 3666 3667 LIST_FOREACH_SAFE(igi, igi_head, igi_link, tigi) { 3668 db_printf("igmp_ifsoftc %p:\n", igi); 3669 db_printf(" ifp %p\n", igi->igi_ifp); 3670 db_printf(" version %u\n", igi->igi_version); 3671 db_printf(" v1_timer %u\n", igi->igi_v1_timer); 3672 db_printf(" v2_timer %u\n", igi->igi_v2_timer); 3673 db_printf(" v3_timer %u\n", igi->igi_v3_timer); 3674 db_printf(" flags %#x\n", igi->igi_flags); 3675 db_printf(" rv %u\n", igi->igi_rv); 3676 db_printf(" qi %u\n", igi->igi_qi); 3677 db_printf(" qri %u\n", igi->igi_qri); 3678 db_printf(" uri %u\n", igi->igi_uri); 3679 /* struct mbufq igi_gq; */ 3680 db_printf("\n"); 3681 } 3682 } 3683 #endif 3684 3685 static int 3686 igmp_modevent(module_t mod, int type, void *unused __unused) 3687 { 3688 3689 switch (type) { 3690 case MOD_LOAD: 3691 CTR1(KTR_IGMPV3, "%s: initializing", __func__); 3692 IGMP_LOCK_INIT(); 3693 m_raopt = igmp_ra_alloc(); 3694 netisr_register(&igmp_nh); 3695 callout_init(&igmpslow_callout, 1); 3696 callout_reset(&igmpslow_callout, hz / IGMP_SLOWHZ, 3697 igmp_slowtimo, NULL); 3698 callout_init(&igmpfast_callout, 1); 3699 callout_reset(&igmpfast_callout, hz / IGMP_FASTHZ, 3700 igmp_fasttimo, NULL); 3701 break; 3702 case MOD_UNLOAD: 3703 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3704 netisr_unregister(&igmp_nh); 3705 m_free(m_raopt); 3706 m_raopt = NULL; 3707 IGMP_LOCK_DESTROY(); 3708 break; 3709 default: 3710 return (EOPNOTSUPP); 3711 } 3712 return (0); 3713 } 3714 3715 static moduledata_t igmp_mod = { 3716 "igmp", 3717 igmp_modevent, 3718 0 3719 }; 3720 DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE); 3721