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 37 /* 38 * Internet Group Management Protocol (IGMP) routines. 39 * [RFC1112, RFC2236, RFC3376] 40 * 41 * Written by Steve Deering, Stanford, May 1988. 42 * Modified by Rosen Sharma, Stanford, Aug 1994. 43 * Modified by Bill Fenner, Xerox PARC, Feb 1995. 44 * Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995. 45 * Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson. 46 * 47 * MULTICAST Revision: 3.5.1.4 48 */ 49 50 #include <sys/cdefs.h> 51 #include "opt_ddb.h" 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/module.h> 56 #include <sys/malloc.h> 57 #include <sys/mbuf.h> 58 #include <sys/socket.h> 59 #include <sys/kernel.h> 60 #include <sys/lock.h> 61 #include <sys/sysctl.h> 62 #include <sys/ktr.h> 63 #include <sys/condvar.h> 64 65 #ifdef DDB 66 #include <ddb/ddb.h> 67 #endif 68 69 #include <net/if.h> 70 #include <net/if_var.h> 71 #include <net/if_private.h> 72 #include <net/netisr.h> 73 #include <net/vnet.h> 74 75 #include <netinet/in.h> 76 #include <netinet/in_var.h> 77 #include <netinet/in_systm.h> 78 #include <netinet/ip.h> 79 #include <netinet/ip_var.h> 80 #include <netinet/ip_options.h> 81 #include <netinet/igmp.h> 82 #include <netinet/igmp_var.h> 83 84 #include <machine/in_cksum.h> 85 86 #include <security/mac/mac_framework.h> 87 88 #ifndef KTR_IGMPV3 89 #define KTR_IGMPV3 KTR_INET 90 #endif 91 92 #define IGMP_SLOWHZ 2 /* 2 slow timeouts per second */ 93 #define IGMP_FASTHZ 5 /* 5 fast timeouts per second */ 94 #define IGMP_RESPONSE_BURST_INTERVAL (IGMP_FASTHZ / 2) 95 96 static struct igmp_ifsoftc * 97 igi_alloc_locked(struct ifnet *); 98 static void igi_delete_locked(const struct ifnet *); 99 static void igmp_dispatch_queue(struct mbufq *, int, const int); 100 static void igmp_fasttimo_vnet(void); 101 static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 102 static int igmp_handle_state_change(struct in_multi *, 103 struct igmp_ifsoftc *); 104 static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 105 static int igmp_input_v1_query(struct ifnet *, const struct ip *, 106 const struct igmp *); 107 static int igmp_input_v2_query(struct ifnet *, const struct ip *, 108 const struct igmp *); 109 static int igmp_input_v3_query(struct ifnet *, const struct ip *, 110 /*const*/ struct igmpv3 *); 111 static int igmp_input_v3_group_query(struct in_multi *, 112 struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 113 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 114 /*const*/ struct igmp *); 115 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 116 /*const*/ struct igmp *); 117 static void igmp_intr(struct mbuf *); 118 static int igmp_isgroupreported(const struct in_addr); 119 static struct mbuf * 120 igmp_ra_alloc(void); 121 #ifdef KTR 122 static char * igmp_rec_type_to_str(const int); 123 #endif 124 static void igmp_set_version(struct igmp_ifsoftc *, const int); 125 static void igmp_slowtimo_vnet(void); 126 static int igmp_v1v2_queue_report(struct in_multi *, const int); 127 static void igmp_v1v2_process_group_timer(struct in_multi *, const int); 128 static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 129 static void igmp_v2_update_group(struct in_multi *, const int); 130 static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 131 static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 132 static struct mbuf * 133 igmp_v3_encap_report(struct ifnet *, struct mbuf *); 134 static int igmp_v3_enqueue_group_record(struct mbufq *, 135 struct in_multi *, const int, const int, const int); 136 static int igmp_v3_enqueue_filter_change(struct mbufq *, 137 struct in_multi *); 138 static void igmp_v3_process_group_timers(struct in_multi_head *, 139 struct mbufq *, struct mbufq *, struct in_multi *, 140 const int); 141 static int igmp_v3_merge_state_changes(struct in_multi *, 142 struct mbufq *); 143 static void igmp_v3_suppress_group_record(struct in_multi *); 144 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 145 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 146 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 147 static int sysctl_igmp_stat(SYSCTL_HANDLER_ARGS); 148 149 static const struct netisr_handler igmp_nh = { 150 .nh_name = "igmp", 151 .nh_handler = igmp_intr, 152 .nh_proto = NETISR_IGMP, 153 .nh_policy = NETISR_POLICY_SOURCE, 154 }; 155 156 /* 157 * System-wide globals. 158 * 159 * Unlocked access to these is OK, except for the global IGMP output 160 * queue. The IGMP subsystem lock ends up being system-wide for the moment, 161 * because all VIMAGEs have to share a global output queue, as netisrs 162 * themselves are not virtualized. 163 * 164 * Locking: 165 * * The permitted lock order is: IN_MULTI_LIST_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 166 * Any may be taken independently; if any are held at the same 167 * time, the above lock order must be followed. 168 * * All output is delegated to the netisr. 169 * Now that Giant has been eliminated, the netisr may be inlined. 170 * * IN_MULTI_LIST_LOCK covers in_multi. 171 * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 172 * including the output queue. 173 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 174 * per-link state iterators. 175 * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 176 * therefore it is not refcounted. 177 * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 178 * 179 * Reference counting 180 * * IGMP acquires its own reference every time an in_multi is passed to 181 * it and the group is being joined for the first time. 182 * * IGMP releases its reference(s) on in_multi in a deferred way, 183 * because the operations which process the release run as part of 184 * a loop whose control variables are directly affected by the release 185 * (that, and not recursing on the IF_ADDR_LOCK). 186 * 187 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 188 * to a vnet in ifp->if_vnet. 189 * 190 * SMPng: XXX We may potentially race operations on ifma_protospec. 191 * The problem is that we currently lack a clean way of taking the 192 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 193 * as anything which modifies ifma needs to be covered by that lock. 194 * So check for ifma_protospec being NULL before proceeding. 195 */ 196 struct mtx igmp_mtx; 197 198 struct mbuf *m_raopt; /* Router Alert option */ 199 static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 200 201 /* 202 * VIMAGE-wide globals. 203 * 204 * The IGMPv3 timers themselves need to run per-image, however, for 205 * historical reasons, timers run globally. This needs to be improved. 206 * An ifnet can only be in one vimage at a time, and the loopback 207 * ifnet, loif, is itself virtualized. 208 * It would otherwise be possible to seriously hose IGMP state, 209 * and create inconsistencies in upstream multicast routing, if you have 210 * multiple VIMAGEs running on the same link joining different multicast 211 * groups, UNLESS the "primary IP address" is different. This is because 212 * IGMP for IPv4 does not force link-local addresses to be used for each 213 * node, unlike MLD for IPv6. 214 * Obviously the IGMPv3 per-interface state has per-vimage granularity 215 * also as a result. 216 * 217 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 218 * policy to control the address used by IGMP on the link. 219 */ 220 VNET_DEFINE_STATIC(int, interface_timers_running); /* IGMPv3 general 221 * query response */ 222 VNET_DEFINE_STATIC(int, state_change_timers_running); /* IGMPv3 state-change 223 * retransmit */ 224 VNET_DEFINE_STATIC(int, current_state_timers_running); /* IGMPv1/v2 host 225 * report; IGMPv3 g/sg 226 * query response */ 227 228 #define V_interface_timers_running VNET(interface_timers_running) 229 #define V_state_change_timers_running VNET(state_change_timers_running) 230 #define V_current_state_timers_running VNET(current_state_timers_running) 231 232 VNET_PCPUSTAT_DEFINE(struct igmpstat, igmpstat); 233 VNET_PCPUSTAT_SYSINIT(igmpstat); 234 VNET_PCPUSTAT_SYSUNINIT(igmpstat); 235 236 VNET_DEFINE_STATIC(LIST_HEAD(, igmp_ifsoftc), igi_head) = 237 LIST_HEAD_INITIALIZER(igi_head); 238 VNET_DEFINE_STATIC(struct timeval, igmp_gsrdelay) = {10, 0}; 239 240 #define V_igi_head VNET(igi_head) 241 #define V_igmp_gsrdelay VNET(igmp_gsrdelay) 242 243 VNET_DEFINE_STATIC(int, igmp_recvifkludge) = 1; 244 VNET_DEFINE_STATIC(int, igmp_sendra) = 1; 245 VNET_DEFINE_STATIC(int, igmp_sendlocal) = 1; 246 VNET_DEFINE_STATIC(int, igmp_v1enable) = 1; 247 VNET_DEFINE_STATIC(int, igmp_v2enable) = 1; 248 VNET_DEFINE_STATIC(int, igmp_legacysupp); 249 VNET_DEFINE_STATIC(int, igmp_default_version) = IGMP_VERSION_3; 250 251 #define V_igmp_recvifkludge VNET(igmp_recvifkludge) 252 #define V_igmp_sendra VNET(igmp_sendra) 253 #define V_igmp_sendlocal VNET(igmp_sendlocal) 254 #define V_igmp_v1enable VNET(igmp_v1enable) 255 #define V_igmp_v2enable VNET(igmp_v2enable) 256 #define V_igmp_legacysupp VNET(igmp_legacysupp) 257 #define V_igmp_default_version VNET(igmp_default_version) 258 259 /* 260 * Virtualized sysctls. 261 */ 262 SYSCTL_PROC(_net_inet_igmp, IGMPCTL_STATS, stats, 263 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_MPSAFE, 264 &VNET_NAME(igmpstat), 0, sysctl_igmp_stat, "S,igmpstat", 265 "IGMP statistics (struct igmpstat, netinet/igmp_var.h)"); 266 SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 267 &VNET_NAME(igmp_recvifkludge), 0, 268 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 269 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 270 &VNET_NAME(igmp_sendra), 0, 271 "Send IP Router Alert option in IGMPv2/v3 messages"); 272 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 273 &VNET_NAME(igmp_sendlocal), 0, 274 "Send IGMP membership reports for 224.0.0.0/24 groups"); 275 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 276 &VNET_NAME(igmp_v1enable), 0, 277 "Enable backwards compatibility with IGMPv1"); 278 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 279 &VNET_NAME(igmp_v2enable), 0, 280 "Enable backwards compatibility with IGMPv2"); 281 SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 282 &VNET_NAME(igmp_legacysupp), 0, 283 "Allow v1/v2 reports to suppress v3 group responses"); 284 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 285 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 286 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 287 "Default version of IGMP to run on each interface"); 288 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 289 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 290 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 291 "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 292 293 /* 294 * Non-virtualized sysctls. 295 */ 296 static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 297 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 298 "Per-interface IGMPv3 state"); 299 300 static __inline void 301 igmp_save_context(struct mbuf *m, struct ifnet *ifp) 302 { 303 304 #ifdef VIMAGE 305 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 306 #endif /* VIMAGE */ 307 m->m_pkthdr.rcvif = ifp; 308 m->m_pkthdr.flowid = ifp->if_index; 309 } 310 311 static __inline void 312 igmp_scrub_context(struct mbuf *m) 313 { 314 315 m->m_pkthdr.PH_loc.ptr = NULL; 316 m->m_pkthdr.flowid = 0; 317 } 318 319 /* 320 * Restore context from a queued IGMP output chain. 321 * Return saved ifindex. 322 * 323 * VIMAGE: The assertion is there to make sure that we 324 * actually called CURVNET_SET() with what's in the mbuf chain. 325 */ 326 static __inline uint32_t 327 igmp_restore_context(struct mbuf *m) 328 { 329 330 #ifdef notyet 331 #if defined(VIMAGE) && defined(INVARIANTS) 332 KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 333 ("%s: called when curvnet was not restored", __func__)); 334 #endif 335 #endif 336 return (m->m_pkthdr.flowid); 337 } 338 339 /* 340 * IGMP statistics. 341 */ 342 static int 343 sysctl_igmp_stat(SYSCTL_HANDLER_ARGS) 344 { 345 struct igmpstat igps0; 346 int error; 347 char *p; 348 349 error = sysctl_wire_old_buffer(req, sizeof(struct igmpstat)); 350 if (error) 351 return (error); 352 353 if (req->oldptr != NULL) { 354 if (req->oldlen < sizeof(struct igmpstat)) 355 error = ENOMEM; 356 else { 357 /* 358 * Copy the counters, and explicitly set the struct's 359 * version and length fields. 360 */ 361 COUNTER_ARRAY_COPY(VNET(igmpstat), &igps0, 362 sizeof(struct igmpstat) / sizeof(uint64_t)); 363 igps0.igps_version = IGPS_VERSION_3; 364 igps0.igps_len = IGPS_VERSION3_LEN; 365 error = SYSCTL_OUT(req, &igps0, 366 sizeof(struct igmpstat)); 367 } 368 } else 369 req->validlen = sizeof(struct igmpstat); 370 if (error) 371 goto out; 372 if (req->newptr != NULL) { 373 if (req->newlen < sizeof(struct igmpstat)) 374 error = ENOMEM; 375 else 376 error = SYSCTL_IN(req, &igps0, 377 sizeof(igps0)); 378 if (error) 379 goto out; 380 /* 381 * igps0 must be "all zero". 382 */ 383 p = (char *)&igps0; 384 while (p < (char *)&igps0 + sizeof(igps0) && *p == '\0') 385 p++; 386 if (p != (char *)&igps0 + sizeof(igps0)) { 387 error = EINVAL; 388 goto out; 389 } 390 COUNTER_ARRAY_ZERO(VNET(igmpstat), 391 sizeof(struct igmpstat) / sizeof(uint64_t)); 392 } 393 out: 394 return (error); 395 } 396 397 /* 398 * Retrieve or set default IGMP version. 399 * 400 * VIMAGE: Assume curvnet set by caller. 401 * SMPng: NOTE: Serialized by IGMP lock. 402 */ 403 static int 404 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 405 { 406 int error; 407 int new; 408 409 error = sysctl_wire_old_buffer(req, sizeof(int)); 410 if (error) 411 return (error); 412 413 IGMP_LOCK(); 414 415 new = V_igmp_default_version; 416 417 error = sysctl_handle_int(oidp, &new, 0, req); 418 if (error || !req->newptr) 419 goto out_locked; 420 421 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 422 error = EINVAL; 423 goto out_locked; 424 } 425 426 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 427 V_igmp_default_version, new); 428 429 V_igmp_default_version = new; 430 431 out_locked: 432 IGMP_UNLOCK(); 433 return (error); 434 } 435 436 /* 437 * Retrieve or set threshold between group-source queries in seconds. 438 * 439 * VIMAGE: Assume curvnet set by caller. 440 * SMPng: NOTE: Serialized by IGMP lock. 441 */ 442 static int 443 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 444 { 445 int error; 446 int i; 447 448 error = sysctl_wire_old_buffer(req, sizeof(int)); 449 if (error) 450 return (error); 451 452 IGMP_LOCK(); 453 454 i = V_igmp_gsrdelay.tv_sec; 455 456 error = sysctl_handle_int(oidp, &i, 0, req); 457 if (error || !req->newptr) 458 goto out_locked; 459 460 if (i < -1 || i >= 60) { 461 error = EINVAL; 462 goto out_locked; 463 } 464 465 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 466 V_igmp_gsrdelay.tv_sec, i); 467 V_igmp_gsrdelay.tv_sec = i; 468 469 out_locked: 470 IGMP_UNLOCK(); 471 return (error); 472 } 473 474 /* 475 * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 476 * For use by ifmcstat(8). 477 * 478 * SMPng: NOTE: Does an unlocked ifindex space read. 479 * VIMAGE: Assume curvnet set by caller. The node handler itself 480 * is not directly virtualized. 481 */ 482 static int 483 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 484 { 485 struct epoch_tracker et; 486 int *name; 487 int error; 488 u_int namelen; 489 struct ifnet *ifp; 490 struct igmp_ifsoftc *igi; 491 492 name = (int *)arg1; 493 namelen = arg2; 494 495 if (req->newptr != NULL) 496 return (EPERM); 497 498 if (namelen != 1) 499 return (EINVAL); 500 501 error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo)); 502 if (error) 503 return (error); 504 505 IN_MULTI_LIST_LOCK(); 506 IGMP_LOCK(); 507 508 error = ENOENT; 509 510 NET_EPOCH_ENTER(et); 511 ifp = ifnet_byindex(name[0]); 512 NET_EPOCH_EXIT(et); 513 if (ifp == NULL) 514 goto out_locked; 515 516 LIST_FOREACH(igi, &V_igi_head, igi_link) { 517 if (ifp == igi->igi_ifp) { 518 struct igmp_ifinfo info; 519 520 info.igi_version = igi->igi_version; 521 info.igi_v1_timer = igi->igi_v1_timer; 522 info.igi_v2_timer = igi->igi_v2_timer; 523 info.igi_v3_timer = igi->igi_v3_timer; 524 info.igi_flags = igi->igi_flags; 525 info.igi_rv = igi->igi_rv; 526 info.igi_qi = igi->igi_qi; 527 info.igi_qri = igi->igi_qri; 528 info.igi_uri = igi->igi_uri; 529 error = SYSCTL_OUT(req, &info, sizeof(info)); 530 break; 531 } 532 } 533 534 out_locked: 535 IGMP_UNLOCK(); 536 IN_MULTI_LIST_UNLOCK(); 537 return (error); 538 } 539 540 /* 541 * Dispatch an entire queue of pending packet chains 542 * using the netisr. 543 * VIMAGE: Assumes the vnet pointer has been set. 544 */ 545 static void 546 igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 547 { 548 struct epoch_tracker et; 549 struct mbuf *m; 550 551 NET_EPOCH_ENTER(et); 552 while ((m = mbufq_dequeue(mq)) != NULL) { 553 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 554 if (loop) 555 m->m_flags |= M_IGMP_LOOP; 556 netisr_dispatch(NETISR_IGMP, m); 557 if (--limit == 0) 558 break; 559 } 560 NET_EPOCH_EXIT(et); 561 } 562 563 /* 564 * Filter outgoing IGMP report state by group. 565 * 566 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 567 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 568 * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 569 * this may break certain IGMP snooping switches which rely on the old 570 * report behaviour. 571 * 572 * Return zero if the given group is one for which IGMP reports 573 * should be suppressed, or non-zero if reports should be issued. 574 */ 575 static __inline int 576 igmp_isgroupreported(const struct in_addr addr) 577 { 578 579 if (in_allhosts(addr) || 580 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 581 return (0); 582 583 return (1); 584 } 585 586 /* 587 * Construct a Router Alert option to use in outgoing packets. 588 */ 589 static struct mbuf * 590 igmp_ra_alloc(void) 591 { 592 struct mbuf *m; 593 struct ipoption *p; 594 595 m = m_get(M_WAITOK, MT_DATA); 596 p = mtod(m, struct ipoption *); 597 p->ipopt_dst.s_addr = INADDR_ANY; 598 p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 599 p->ipopt_list[1] = 0x04; /* 4 bytes long */ 600 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 601 p->ipopt_list[3] = 0x00; /* pad byte */ 602 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 603 604 return (m); 605 } 606 607 /* 608 * Attach IGMP when PF_INET is attached to an interface. 609 */ 610 struct igmp_ifsoftc * 611 igmp_domifattach(struct ifnet *ifp) 612 { 613 struct igmp_ifsoftc *igi; 614 615 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 616 __func__, ifp, ifp->if_xname); 617 618 IGMP_LOCK(); 619 620 igi = igi_alloc_locked(ifp); 621 if (!(ifp->if_flags & IFF_MULTICAST)) 622 igi->igi_flags |= IGIF_SILENT; 623 624 IGMP_UNLOCK(); 625 626 return (igi); 627 } 628 629 /* 630 * VIMAGE: assume curvnet set by caller. 631 */ 632 static struct igmp_ifsoftc * 633 igi_alloc_locked(/*const*/ struct ifnet *ifp) 634 { 635 struct igmp_ifsoftc *igi; 636 637 IGMP_LOCK_ASSERT(); 638 639 igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 640 if (igi == NULL) 641 goto out; 642 643 igi->igi_ifp = ifp; 644 igi->igi_version = V_igmp_default_version; 645 igi->igi_flags = 0; 646 igi->igi_rv = IGMP_RV_INIT; 647 igi->igi_qi = IGMP_QI_INIT; 648 igi->igi_qri = IGMP_QRI_INIT; 649 igi->igi_uri = IGMP_URI_INIT; 650 mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 651 652 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 653 654 CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 655 ifp, ifp->if_xname); 656 657 out: 658 return (igi); 659 } 660 661 /* 662 * Hook for ifdetach. 663 * 664 * NOTE: Some finalization tasks need to run before the protocol domain 665 * is detached, but also before the link layer does its cleanup. 666 * 667 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 668 * XXX This is also bitten by unlocked ifma_protospec access. 669 */ 670 void 671 igmp_ifdetach(struct ifnet *ifp) 672 { 673 struct epoch_tracker et; 674 struct igmp_ifsoftc *igi; 675 struct ifmultiaddr *ifma; 676 struct in_multi *inm; 677 struct in_multi_head inm_free_tmp; 678 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 679 ifp->if_xname); 680 681 SLIST_INIT(&inm_free_tmp); 682 IGMP_LOCK(); 683 684 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 685 if (igi->igi_version == IGMP_VERSION_3) { 686 IF_ADDR_WLOCK(ifp); 687 NET_EPOCH_ENTER(et); 688 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 689 inm = inm_ifmultiaddr_get_inm(ifma); 690 if (inm == NULL) 691 continue; 692 if (inm->inm_state == IGMP_LEAVING_MEMBER) 693 inm_rele_locked(&inm_free_tmp, inm); 694 inm_clear_recorded(inm); 695 } 696 NET_EPOCH_EXIT(et); 697 IF_ADDR_WUNLOCK(ifp); 698 inm_release_list_deferred(&inm_free_tmp); 699 } 700 IGMP_UNLOCK(); 701 702 } 703 704 /* 705 * Hook for domifdetach. 706 */ 707 void 708 igmp_domifdetach(struct ifnet *ifp) 709 { 710 711 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 712 __func__, ifp, ifp->if_xname); 713 714 IGMP_LOCK(); 715 igi_delete_locked(ifp); 716 IGMP_UNLOCK(); 717 } 718 719 static void 720 igi_delete_locked(const struct ifnet *ifp) 721 { 722 struct igmp_ifsoftc *igi, *tigi; 723 724 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 725 __func__, ifp, ifp->if_xname); 726 727 IGMP_LOCK_ASSERT(); 728 729 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 730 if (igi->igi_ifp == ifp) { 731 /* 732 * Free deferred General Query responses. 733 */ 734 mbufq_drain(&igi->igi_gq); 735 736 LIST_REMOVE(igi, igi_link); 737 free(igi, M_IGMP); 738 return; 739 } 740 } 741 } 742 743 /* 744 * Process a received IGMPv1 query. 745 * Return non-zero if the message should be dropped. 746 * 747 * VIMAGE: The curvnet pointer is derived from the input ifp. 748 */ 749 static int 750 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 751 const struct igmp *igmp) 752 { 753 struct ifmultiaddr *ifma; 754 struct igmp_ifsoftc *igi; 755 struct in_multi *inm; 756 757 NET_EPOCH_ASSERT(); 758 759 /* 760 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 761 * 224.0.0.1. They are always treated as General Queries. 762 * igmp_group is always ignored. Do not drop it as a userland 763 * daemon may wish to see it. 764 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 765 */ 766 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 767 IGMPSTAT_INC(igps_rcv_badqueries); 768 return (0); 769 } 770 IGMPSTAT_INC(igps_rcv_gen_queries); 771 772 IN_MULTI_LIST_LOCK(); 773 IGMP_LOCK(); 774 775 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 776 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 777 778 if (igi->igi_flags & IGIF_LOOPBACK) { 779 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 780 ifp, ifp->if_xname); 781 goto out_locked; 782 } 783 784 /* 785 * Switch to IGMPv1 host compatibility mode. 786 */ 787 igmp_set_version(igi, IGMP_VERSION_1); 788 789 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 790 791 /* 792 * Start the timers in all of our group records 793 * for the interface on which the query arrived, 794 * except those which are already running. 795 */ 796 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 797 inm = inm_ifmultiaddr_get_inm(ifma); 798 if (inm == NULL) 799 continue; 800 if (inm->inm_timer != 0) 801 continue; 802 switch (inm->inm_state) { 803 case IGMP_NOT_MEMBER: 804 case IGMP_SILENT_MEMBER: 805 break; 806 case IGMP_G_QUERY_PENDING_MEMBER: 807 case IGMP_SG_QUERY_PENDING_MEMBER: 808 case IGMP_REPORTING_MEMBER: 809 case IGMP_IDLE_MEMBER: 810 case IGMP_LAZY_MEMBER: 811 case IGMP_SLEEPING_MEMBER: 812 case IGMP_AWAKENING_MEMBER: 813 inm->inm_state = IGMP_REPORTING_MEMBER; 814 inm->inm_timer = IGMP_RANDOM_DELAY( 815 IGMP_V1V2_MAX_RI * IGMP_FASTHZ); 816 V_current_state_timers_running = 1; 817 break; 818 case IGMP_LEAVING_MEMBER: 819 break; 820 } 821 } 822 823 out_locked: 824 IGMP_UNLOCK(); 825 IN_MULTI_LIST_UNLOCK(); 826 827 return (0); 828 } 829 830 /* 831 * Process a received IGMPv2 general or group-specific query. 832 */ 833 static int 834 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 835 const struct igmp *igmp) 836 { 837 struct ifmultiaddr *ifma; 838 struct igmp_ifsoftc *igi; 839 struct in_multi *inm; 840 int is_general_query; 841 uint16_t timer; 842 843 NET_EPOCH_ASSERT(); 844 845 is_general_query = 0; 846 847 /* 848 * Validate address fields upfront. 849 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 850 */ 851 if (in_nullhost(igmp->igmp_group)) { 852 /* 853 * IGMPv2 General Query. 854 * If this was not sent to the all-hosts group, ignore it. 855 */ 856 if (!in_allhosts(ip->ip_dst)) 857 return (0); 858 IGMPSTAT_INC(igps_rcv_gen_queries); 859 is_general_query = 1; 860 } else { 861 /* IGMPv2 Group-Specific Query. */ 862 IGMPSTAT_INC(igps_rcv_group_queries); 863 } 864 865 IN_MULTI_LIST_LOCK(); 866 IGMP_LOCK(); 867 868 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 869 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 870 871 if (igi->igi_flags & IGIF_LOOPBACK) { 872 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 873 ifp, ifp->if_xname); 874 goto out_locked; 875 } 876 877 /* 878 * Ignore v2 query if in v1 Compatibility Mode. 879 */ 880 if (igi->igi_version == IGMP_VERSION_1) 881 goto out_locked; 882 883 igmp_set_version(igi, IGMP_VERSION_2); 884 885 timer = igmp->igmp_code * IGMP_FASTHZ / IGMP_TIMER_SCALE; 886 if (timer == 0) 887 timer = 1; 888 889 if (is_general_query) { 890 /* 891 * For each reporting group joined on this 892 * interface, kick the report timer. 893 */ 894 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 895 ifp, ifp->if_xname); 896 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 897 inm = inm_ifmultiaddr_get_inm(ifma); 898 if (inm == NULL) 899 continue; 900 igmp_v2_update_group(inm, timer); 901 } 902 } else { 903 /* 904 * Group-specific IGMPv2 query, we need only 905 * look up the single group to process it. 906 */ 907 inm = inm_lookup(ifp, igmp->igmp_group); 908 if (inm != NULL) { 909 CTR3(KTR_IGMPV3, 910 "process v2 query 0x%08x on ifp %p(%s)", 911 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 912 igmp_v2_update_group(inm, timer); 913 } 914 } 915 916 out_locked: 917 IGMP_UNLOCK(); 918 IN_MULTI_LIST_UNLOCK(); 919 920 return (0); 921 } 922 923 /* 924 * Update the report timer on a group in response to an IGMPv2 query. 925 * 926 * If we are becoming the reporting member for this group, start the timer. 927 * If we already are the reporting member for this group, and timer is 928 * below the threshold, reset it. 929 * 930 * We may be updating the group for the first time since we switched 931 * to IGMPv3. If we are, then we must clear any recorded source lists, 932 * and transition to REPORTING state; the group timer is overloaded 933 * for group and group-source query responses. 934 * 935 * Unlike IGMPv3, the delay per group should be jittered 936 * to avoid bursts of IGMPv2 reports. 937 */ 938 static void 939 igmp_v2_update_group(struct in_multi *inm, const int timer) 940 { 941 942 CTR4(KTR_IGMPV3, "0x%08x: %s/%s timer=%d", __func__, 943 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname, timer); 944 945 IN_MULTI_LIST_LOCK_ASSERT(); 946 947 switch (inm->inm_state) { 948 case IGMP_NOT_MEMBER: 949 case IGMP_SILENT_MEMBER: 950 break; 951 case IGMP_REPORTING_MEMBER: 952 if (inm->inm_timer != 0 && 953 inm->inm_timer <= timer) { 954 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 955 "skipping.", __func__); 956 break; 957 } 958 /* FALLTHROUGH */ 959 case IGMP_SG_QUERY_PENDING_MEMBER: 960 case IGMP_G_QUERY_PENDING_MEMBER: 961 case IGMP_IDLE_MEMBER: 962 case IGMP_LAZY_MEMBER: 963 case IGMP_AWAKENING_MEMBER: 964 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 965 inm->inm_state = IGMP_REPORTING_MEMBER; 966 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 967 V_current_state_timers_running = 1; 968 break; 969 case IGMP_SLEEPING_MEMBER: 970 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 971 inm->inm_state = IGMP_AWAKENING_MEMBER; 972 break; 973 case IGMP_LEAVING_MEMBER: 974 break; 975 } 976 } 977 978 /* 979 * Process a received IGMPv3 general, group-specific or 980 * group-and-source-specific query. 981 * Assumes m has already been pulled up to the full IGMP message length. 982 * Return 0 if successful, otherwise an appropriate error code is returned. 983 */ 984 static int 985 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 986 /*const*/ struct igmpv3 *igmpv3) 987 { 988 struct igmp_ifsoftc *igi; 989 struct in_multi *inm; 990 int is_general_query; 991 uint32_t maxresp, nsrc, qqi; 992 uint16_t timer; 993 uint8_t qrv; 994 995 is_general_query = 0; 996 997 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 998 999 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 1000 if (maxresp >= 128) { 1001 maxresp = IGMP_MANT(igmpv3->igmp_code) << 1002 (IGMP_EXP(igmpv3->igmp_code) + 3); 1003 } 1004 1005 /* 1006 * Robustness must never be less than 2 for on-wire IGMPv3. 1007 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 1008 * an exception for interfaces whose IGMPv3 state changes 1009 * are redirected to loopback (e.g. MANET). 1010 */ 1011 qrv = IGMP_QRV(igmpv3->igmp_misc); 1012 if (qrv < 2) { 1013 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 1014 qrv, IGMP_RV_INIT); 1015 qrv = IGMP_RV_INIT; 1016 } 1017 1018 qqi = igmpv3->igmp_qqi; 1019 if (qqi >= 128) { 1020 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 1021 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 1022 } 1023 1024 timer = maxresp * IGMP_FASTHZ / IGMP_TIMER_SCALE; 1025 if (timer == 0) 1026 timer = 1; 1027 1028 nsrc = ntohs(igmpv3->igmp_numsrc); 1029 1030 /* 1031 * Validate address fields and versions upfront before 1032 * accepting v3 query. 1033 * XXX SMPng: Unlocked access to igmpstat counters here. 1034 */ 1035 if (in_nullhost(igmpv3->igmp_group)) { 1036 /* 1037 * IGMPv3 General Query. 1038 * 1039 * General Queries SHOULD be directed to 224.0.0.1. 1040 * A general query with a source list has undefined 1041 * behaviour; discard it. 1042 */ 1043 IGMPSTAT_INC(igps_rcv_gen_queries); 1044 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1045 IGMPSTAT_INC(igps_rcv_badqueries); 1046 return (0); 1047 } 1048 is_general_query = 1; 1049 } else { 1050 /* Group or group-source specific query. */ 1051 if (nsrc == 0) 1052 IGMPSTAT_INC(igps_rcv_group_queries); 1053 else 1054 IGMPSTAT_INC(igps_rcv_gsr_queries); 1055 } 1056 1057 IN_MULTI_LIST_LOCK(); 1058 IGMP_LOCK(); 1059 1060 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1061 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1062 1063 if (igi->igi_flags & IGIF_LOOPBACK) { 1064 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1065 ifp, ifp->if_xname); 1066 goto out_locked; 1067 } 1068 1069 /* 1070 * Discard the v3 query if we're in Compatibility Mode. 1071 * The RFC is not obviously worded that hosts need to stay in 1072 * compatibility mode until the Old Version Querier Present 1073 * timer expires. 1074 */ 1075 if (igi->igi_version != IGMP_VERSION_3) { 1076 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1077 igi->igi_version, ifp, ifp->if_xname); 1078 goto out_locked; 1079 } 1080 1081 igmp_set_version(igi, IGMP_VERSION_3); 1082 igi->igi_rv = qrv; 1083 igi->igi_qi = qqi; 1084 igi->igi_qri = maxresp; 1085 1086 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1087 maxresp); 1088 1089 if (is_general_query) { 1090 /* 1091 * Schedule a current-state report on this ifp for 1092 * all groups, possibly containing source lists. 1093 * If there is a pending General Query response 1094 * scheduled earlier than the selected delay, do 1095 * not schedule any other reports. 1096 * Otherwise, reset the interface timer. 1097 */ 1098 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1099 ifp, ifp->if_xname); 1100 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1101 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1102 V_interface_timers_running = 1; 1103 } 1104 } else { 1105 /* 1106 * Group-source-specific queries are throttled on 1107 * a per-group basis to defeat denial-of-service attempts. 1108 * Queries for groups we are not a member of on this 1109 * link are simply ignored. 1110 */ 1111 inm = inm_lookup(ifp, igmpv3->igmp_group); 1112 if (inm == NULL) 1113 goto out_locked; 1114 if (nsrc > 0) { 1115 if (!ratecheck(&inm->inm_lastgsrtv, 1116 &V_igmp_gsrdelay)) { 1117 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1118 __func__); 1119 IGMPSTAT_INC(igps_drop_gsr_queries); 1120 goto out_locked; 1121 } 1122 } 1123 CTR3(KTR_IGMPV3, "process v3 0x%08x query on ifp %p(%s)", 1124 ntohl(igmpv3->igmp_group.s_addr), ifp, ifp->if_xname); 1125 /* 1126 * If there is a pending General Query response 1127 * scheduled sooner than the selected delay, no 1128 * further report need be scheduled. 1129 * Otherwise, prepare to respond to the 1130 * group-specific or group-and-source query. 1131 */ 1132 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1133 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1134 } 1135 1136 out_locked: 1137 IGMP_UNLOCK(); 1138 IN_MULTI_LIST_UNLOCK(); 1139 1140 return (0); 1141 } 1142 1143 /* 1144 * Process a received IGMPv3 group-specific or group-and-source-specific 1145 * query. 1146 * Return <0 if any error occurred. Currently this is ignored. 1147 */ 1148 static int 1149 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1150 int timer, /*const*/ struct igmpv3 *igmpv3) 1151 { 1152 int retval; 1153 uint16_t nsrc; 1154 1155 IN_MULTI_LIST_LOCK_ASSERT(); 1156 IGMP_LOCK_ASSERT(); 1157 1158 retval = 0; 1159 1160 switch (inm->inm_state) { 1161 case IGMP_NOT_MEMBER: 1162 case IGMP_SILENT_MEMBER: 1163 case IGMP_SLEEPING_MEMBER: 1164 case IGMP_LAZY_MEMBER: 1165 case IGMP_AWAKENING_MEMBER: 1166 case IGMP_IDLE_MEMBER: 1167 case IGMP_LEAVING_MEMBER: 1168 return (retval); 1169 break; 1170 case IGMP_REPORTING_MEMBER: 1171 case IGMP_G_QUERY_PENDING_MEMBER: 1172 case IGMP_SG_QUERY_PENDING_MEMBER: 1173 break; 1174 } 1175 1176 nsrc = ntohs(igmpv3->igmp_numsrc); 1177 1178 /* 1179 * Deal with group-specific queries upfront. 1180 * If any group query is already pending, purge any recorded 1181 * source-list state if it exists, and schedule a query response 1182 * for this group-specific query. 1183 */ 1184 if (nsrc == 0) { 1185 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1186 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1187 inm_clear_recorded(inm); 1188 timer = min(inm->inm_timer, timer); 1189 } 1190 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1191 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1192 V_current_state_timers_running = 1; 1193 return (retval); 1194 } 1195 1196 /* 1197 * Deal with the case where a group-and-source-specific query has 1198 * been received but a group-specific query is already pending. 1199 */ 1200 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1201 timer = min(inm->inm_timer, timer); 1202 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1203 V_current_state_timers_running = 1; 1204 return (retval); 1205 } 1206 1207 /* 1208 * Finally, deal with the case where a group-and-source-specific 1209 * query has been received, where a response to a previous g-s-r 1210 * query exists, or none exists. 1211 * In this case, we need to parse the source-list which the Querier 1212 * has provided us with and check if we have any source list filter 1213 * entries at T1 for these sources. If we do not, there is no need 1214 * schedule a report and the query may be dropped. 1215 * If we do, we must record them and schedule a current-state 1216 * report for those sources. 1217 * FIXME: Handling source lists larger than 1 mbuf requires that 1218 * we pass the mbuf chain pointer down to this function, and use 1219 * m_getptr() to walk the chain. 1220 */ 1221 if (inm->inm_nsrc > 0) { 1222 const struct in_addr *ap; 1223 int i, nrecorded; 1224 1225 ap = (const struct in_addr *)(igmpv3 + 1); 1226 nrecorded = 0; 1227 for (i = 0; i < nsrc; i++, ap++) { 1228 retval = inm_record_source(inm, ap->s_addr); 1229 if (retval < 0) 1230 break; 1231 nrecorded += retval; 1232 } 1233 if (nrecorded > 0) { 1234 CTR1(KTR_IGMPV3, 1235 "%s: schedule response to SG query", __func__); 1236 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1237 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1238 V_current_state_timers_running = 1; 1239 } 1240 } 1241 1242 return (retval); 1243 } 1244 1245 /* 1246 * Process a received IGMPv1 host membership report. 1247 * 1248 * NOTE: 0.0.0.0 workaround breaks const correctness. 1249 */ 1250 static int 1251 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1252 /*const*/ struct igmp *igmp) 1253 { 1254 struct in_ifaddr *ia; 1255 struct in_multi *inm; 1256 1257 IGMPSTAT_INC(igps_rcv_reports); 1258 1259 if (ifp->if_flags & IFF_LOOPBACK) 1260 return (0); 1261 1262 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1263 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1264 IGMPSTAT_INC(igps_rcv_badreports); 1265 return (EINVAL); 1266 } 1267 1268 /* 1269 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1270 * Booting clients may use the source address 0.0.0.0. Some 1271 * IGMP daemons may not know how to use IP_RECVIF to determine 1272 * the interface upon which this message was received. 1273 * Replace 0.0.0.0 with the subnet address if told to do so. 1274 */ 1275 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1276 IFP_TO_IA(ifp, ia); 1277 if (ia != NULL) 1278 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1279 } 1280 1281 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1282 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1283 1284 /* 1285 * IGMPv1 report suppression. 1286 * If we are a member of this group, and our membership should be 1287 * reported, stop our group timer and transition to the 'lazy' state. 1288 */ 1289 IN_MULTI_LIST_LOCK(); 1290 inm = inm_lookup(ifp, igmp->igmp_group); 1291 if (inm != NULL) { 1292 struct igmp_ifsoftc *igi; 1293 1294 igi = inm->inm_igi; 1295 if (igi == NULL) { 1296 KASSERT(igi != NULL, 1297 ("%s: no igi for ifp %p", __func__, ifp)); 1298 goto out_locked; 1299 } 1300 1301 IGMPSTAT_INC(igps_rcv_ourreports); 1302 1303 /* 1304 * If we are in IGMPv3 host mode, do not allow the 1305 * other host's IGMPv1 report to suppress our reports 1306 * unless explicitly configured to do so. 1307 */ 1308 if (igi->igi_version == IGMP_VERSION_3) { 1309 if (V_igmp_legacysupp) 1310 igmp_v3_suppress_group_record(inm); 1311 goto out_locked; 1312 } 1313 1314 inm->inm_timer = 0; 1315 1316 switch (inm->inm_state) { 1317 case IGMP_NOT_MEMBER: 1318 case IGMP_SILENT_MEMBER: 1319 break; 1320 case IGMP_IDLE_MEMBER: 1321 case IGMP_LAZY_MEMBER: 1322 case IGMP_AWAKENING_MEMBER: 1323 CTR3(KTR_IGMPV3, 1324 "report suppressed for 0x%08x on ifp %p(%s)", 1325 ntohl(igmp->igmp_group.s_addr), ifp, 1326 ifp->if_xname); 1327 case IGMP_SLEEPING_MEMBER: 1328 inm->inm_state = IGMP_SLEEPING_MEMBER; 1329 break; 1330 case IGMP_REPORTING_MEMBER: 1331 CTR3(KTR_IGMPV3, 1332 "report suppressed for 0x%08x on ifp %p(%s)", 1333 ntohl(igmp->igmp_group.s_addr), ifp, 1334 ifp->if_xname); 1335 if (igi->igi_version == IGMP_VERSION_1) 1336 inm->inm_state = IGMP_LAZY_MEMBER; 1337 else if (igi->igi_version == IGMP_VERSION_2) 1338 inm->inm_state = IGMP_SLEEPING_MEMBER; 1339 break; 1340 case IGMP_G_QUERY_PENDING_MEMBER: 1341 case IGMP_SG_QUERY_PENDING_MEMBER: 1342 case IGMP_LEAVING_MEMBER: 1343 break; 1344 } 1345 } 1346 1347 out_locked: 1348 IN_MULTI_LIST_UNLOCK(); 1349 1350 return (0); 1351 } 1352 1353 /* 1354 * Process a received IGMPv2 host membership report. 1355 * 1356 * NOTE: 0.0.0.0 workaround breaks const correctness. 1357 */ 1358 static int 1359 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1360 /*const*/ struct igmp *igmp) 1361 { 1362 struct in_ifaddr *ia; 1363 struct in_multi *inm; 1364 1365 /* 1366 * Make sure we don't hear our own membership report. Fast 1367 * leave requires knowing that we are the only member of a 1368 * group. 1369 */ 1370 IFP_TO_IA(ifp, ia); 1371 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1372 return (0); 1373 } 1374 1375 IGMPSTAT_INC(igps_rcv_reports); 1376 1377 if (ifp->if_flags & IFF_LOOPBACK) { 1378 return (0); 1379 } 1380 1381 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1382 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1383 IGMPSTAT_INC(igps_rcv_badreports); 1384 return (EINVAL); 1385 } 1386 1387 /* 1388 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1389 * Booting clients may use the source address 0.0.0.0. Some 1390 * IGMP daemons may not know how to use IP_RECVIF to determine 1391 * the interface upon which this message was received. 1392 * Replace 0.0.0.0 with the subnet address if told to do so. 1393 */ 1394 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1395 if (ia != NULL) 1396 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1397 } 1398 1399 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1400 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1401 1402 /* 1403 * IGMPv2 report suppression. 1404 * If we are a member of this group, and our membership should be 1405 * reported, and our group timer is pending or about to be reset, 1406 * stop our group timer by transitioning to the 'lazy' state. 1407 */ 1408 IN_MULTI_LIST_LOCK(); 1409 inm = inm_lookup(ifp, igmp->igmp_group); 1410 if (inm != NULL) { 1411 struct igmp_ifsoftc *igi; 1412 1413 igi = inm->inm_igi; 1414 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1415 1416 IGMPSTAT_INC(igps_rcv_ourreports); 1417 1418 /* 1419 * If we are in IGMPv3 host mode, do not allow the 1420 * other host's IGMPv1 report to suppress our reports 1421 * unless explicitly configured to do so. 1422 */ 1423 if (igi->igi_version == IGMP_VERSION_3) { 1424 if (V_igmp_legacysupp) 1425 igmp_v3_suppress_group_record(inm); 1426 goto out_locked; 1427 } 1428 1429 inm->inm_timer = 0; 1430 1431 switch (inm->inm_state) { 1432 case IGMP_NOT_MEMBER: 1433 case IGMP_SILENT_MEMBER: 1434 case IGMP_SLEEPING_MEMBER: 1435 break; 1436 case IGMP_REPORTING_MEMBER: 1437 case IGMP_IDLE_MEMBER: 1438 case IGMP_AWAKENING_MEMBER: 1439 CTR3(KTR_IGMPV3, 1440 "report suppressed for 0x%08x on ifp %p(%s)", 1441 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1442 case IGMP_LAZY_MEMBER: 1443 inm->inm_state = IGMP_LAZY_MEMBER; 1444 break; 1445 case IGMP_G_QUERY_PENDING_MEMBER: 1446 case IGMP_SG_QUERY_PENDING_MEMBER: 1447 case IGMP_LEAVING_MEMBER: 1448 break; 1449 } 1450 } 1451 1452 out_locked: 1453 IN_MULTI_LIST_UNLOCK(); 1454 1455 return (0); 1456 } 1457 1458 int 1459 igmp_input(struct mbuf **mp, int *offp, int proto) 1460 { 1461 int iphlen; 1462 struct ifnet *ifp; 1463 struct igmp *igmp; 1464 struct ip *ip; 1465 struct mbuf *m; 1466 int igmplen; 1467 int minlen; 1468 int queryver; 1469 1470 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1471 1472 m = *mp; 1473 ifp = m->m_pkthdr.rcvif; 1474 *mp = NULL; 1475 1476 IGMPSTAT_INC(igps_rcv_total); 1477 1478 ip = mtod(m, struct ip *); 1479 iphlen = *offp; 1480 igmplen = ntohs(ip->ip_len) - iphlen; 1481 1482 /* 1483 * Validate lengths. 1484 */ 1485 if (igmplen < IGMP_MINLEN) { 1486 IGMPSTAT_INC(igps_rcv_tooshort); 1487 m_freem(m); 1488 return (IPPROTO_DONE); 1489 } 1490 1491 /* 1492 * Always pullup to the minimum size for v1/v2 or v3 1493 * to amortize calls to m_pullup(). 1494 */ 1495 minlen = iphlen; 1496 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1497 minlen += IGMP_V3_QUERY_MINLEN; 1498 else 1499 minlen += IGMP_MINLEN; 1500 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1501 (m = m_pullup(m, minlen)) == NULL) { 1502 IGMPSTAT_INC(igps_rcv_tooshort); 1503 return (IPPROTO_DONE); 1504 } 1505 ip = mtod(m, struct ip *); 1506 1507 /* 1508 * Validate checksum. 1509 */ 1510 m->m_data += iphlen; 1511 m->m_len -= iphlen; 1512 igmp = mtod(m, struct igmp *); 1513 if (in_cksum(m, igmplen)) { 1514 IGMPSTAT_INC(igps_rcv_badsum); 1515 m_freem(m); 1516 return (IPPROTO_DONE); 1517 } 1518 m->m_data -= iphlen; 1519 m->m_len += iphlen; 1520 1521 /* 1522 * IGMP control traffic is link-scope, and must have a TTL of 1. 1523 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1524 * probe packets may come from beyond the LAN. 1525 */ 1526 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1527 IGMPSTAT_INC(igps_rcv_badttl); 1528 m_freem(m); 1529 return (IPPROTO_DONE); 1530 } 1531 1532 switch (igmp->igmp_type) { 1533 case IGMP_HOST_MEMBERSHIP_QUERY: 1534 if (igmplen == IGMP_MINLEN) { 1535 if (igmp->igmp_code == 0) 1536 queryver = IGMP_VERSION_1; 1537 else 1538 queryver = IGMP_VERSION_2; 1539 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1540 queryver = IGMP_VERSION_3; 1541 } else { 1542 IGMPSTAT_INC(igps_rcv_tooshort); 1543 m_freem(m); 1544 return (IPPROTO_DONE); 1545 } 1546 1547 switch (queryver) { 1548 case IGMP_VERSION_1: 1549 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1550 if (!V_igmp_v1enable) 1551 break; 1552 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1553 m_freem(m); 1554 return (IPPROTO_DONE); 1555 } 1556 break; 1557 1558 case IGMP_VERSION_2: 1559 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1560 if (!V_igmp_v2enable) 1561 break; 1562 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1563 m_freem(m); 1564 return (IPPROTO_DONE); 1565 } 1566 break; 1567 1568 case IGMP_VERSION_3: { 1569 struct igmpv3 *igmpv3; 1570 uint16_t igmpv3len; 1571 uint16_t nsrc; 1572 1573 IGMPSTAT_INC(igps_rcv_v3_queries); 1574 igmpv3 = (struct igmpv3 *)igmp; 1575 /* 1576 * Validate length based on source count. 1577 */ 1578 nsrc = ntohs(igmpv3->igmp_numsrc); 1579 if (nsrc * sizeof(in_addr_t) > 1580 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1581 IGMPSTAT_INC(igps_rcv_tooshort); 1582 m_freem(m); 1583 return (IPPROTO_DONE); 1584 } 1585 /* 1586 * m_pullup() may modify m, so pullup in 1587 * this scope. 1588 */ 1589 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1590 sizeof(struct in_addr) * nsrc; 1591 if ((!M_WRITABLE(m) || 1592 m->m_len < igmpv3len) && 1593 (m = m_pullup(m, igmpv3len)) == NULL) { 1594 IGMPSTAT_INC(igps_rcv_tooshort); 1595 return (IPPROTO_DONE); 1596 } 1597 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1598 + iphlen); 1599 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1600 m_freem(m); 1601 return (IPPROTO_DONE); 1602 } 1603 } 1604 break; 1605 } 1606 break; 1607 1608 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1609 if (!V_igmp_v1enable) 1610 break; 1611 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1612 m_freem(m); 1613 return (IPPROTO_DONE); 1614 } 1615 break; 1616 1617 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1618 if (!V_igmp_v2enable) 1619 break; 1620 if (!ip_checkrouteralert(m)) 1621 IGMPSTAT_INC(igps_rcv_nora); 1622 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1623 m_freem(m); 1624 return (IPPROTO_DONE); 1625 } 1626 break; 1627 1628 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1629 /* 1630 * Hosts do not need to process IGMPv3 membership reports, 1631 * as report suppression is no longer required. 1632 */ 1633 if (!ip_checkrouteralert(m)) 1634 IGMPSTAT_INC(igps_rcv_nora); 1635 break; 1636 1637 default: 1638 break; 1639 } 1640 1641 /* 1642 * Pass all valid IGMP packets up to any process(es) listening on a 1643 * raw IGMP socket. 1644 */ 1645 *mp = m; 1646 return (rip_input(mp, offp, proto)); 1647 } 1648 1649 /* 1650 * Fast timeout handler (global). 1651 * VIMAGE: Timeout handlers are expected to service all vimages. 1652 */ 1653 static struct callout igmpfast_callout; 1654 static void 1655 igmp_fasttimo(void *arg __unused) 1656 { 1657 struct epoch_tracker et; 1658 VNET_ITERATOR_DECL(vnet_iter); 1659 1660 NET_EPOCH_ENTER(et); 1661 VNET_LIST_RLOCK_NOSLEEP(); 1662 VNET_FOREACH(vnet_iter) { 1663 CURVNET_SET(vnet_iter); 1664 igmp_fasttimo_vnet(); 1665 CURVNET_RESTORE(); 1666 } 1667 VNET_LIST_RUNLOCK_NOSLEEP(); 1668 NET_EPOCH_EXIT(et); 1669 1670 callout_reset(&igmpfast_callout, hz / IGMP_FASTHZ, igmp_fasttimo, NULL); 1671 } 1672 1673 /* 1674 * Fast timeout handler (per-vnet). 1675 * Sends are shuffled off to a netisr to deal with Giant. 1676 * 1677 * VIMAGE: Assume caller has set up our curvnet. 1678 */ 1679 static void 1680 igmp_fasttimo_vnet(void) 1681 { 1682 struct mbufq scq; /* State-change packets */ 1683 struct mbufq qrq; /* Query response packets */ 1684 struct ifnet *ifp; 1685 struct igmp_ifsoftc *igi; 1686 struct ifmultiaddr *ifma; 1687 struct in_multi *inm; 1688 struct in_multi_head inm_free_tmp; 1689 int loop, uri_fasthz; 1690 1691 loop = 0; 1692 uri_fasthz = 0; 1693 1694 /* 1695 * Quick check to see if any work needs to be done, in order to 1696 * minimize the overhead of fasttimo processing. 1697 * SMPng: XXX Unlocked reads. 1698 */ 1699 if (!V_current_state_timers_running && 1700 !V_interface_timers_running && 1701 !V_state_change_timers_running) 1702 return; 1703 1704 SLIST_INIT(&inm_free_tmp); 1705 IN_MULTI_LIST_LOCK(); 1706 IGMP_LOCK(); 1707 1708 /* 1709 * IGMPv3 General Query response timer processing. 1710 */ 1711 if (V_interface_timers_running) { 1712 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1713 1714 V_interface_timers_running = 0; 1715 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1716 if (igi->igi_v3_timer == 0) { 1717 /* Do nothing. */ 1718 } else if (--igi->igi_v3_timer == 0) { 1719 igmp_v3_dispatch_general_query(igi); 1720 } else { 1721 V_interface_timers_running = 1; 1722 } 1723 } 1724 } 1725 1726 if (!V_current_state_timers_running && 1727 !V_state_change_timers_running) 1728 goto out_locked; 1729 1730 V_current_state_timers_running = 0; 1731 V_state_change_timers_running = 0; 1732 1733 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1734 1735 /* 1736 * IGMPv1/v2/v3 host report and state-change timer processing. 1737 * Note: Processing a v3 group timer may remove a node. 1738 */ 1739 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1740 ifp = igi->igi_ifp; 1741 1742 if (igi->igi_version == IGMP_VERSION_3) { 1743 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1744 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1745 IGMP_FASTHZ); 1746 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1747 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1748 } 1749 1750 IF_ADDR_WLOCK(ifp); 1751 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1752 inm = inm_ifmultiaddr_get_inm(ifma); 1753 if (inm == NULL) 1754 continue; 1755 switch (igi->igi_version) { 1756 case IGMP_VERSION_1: 1757 case IGMP_VERSION_2: 1758 igmp_v1v2_process_group_timer(inm, 1759 igi->igi_version); 1760 break; 1761 case IGMP_VERSION_3: 1762 igmp_v3_process_group_timers(&inm_free_tmp, &qrq, 1763 &scq, inm, uri_fasthz); 1764 break; 1765 } 1766 } 1767 IF_ADDR_WUNLOCK(ifp); 1768 1769 if (igi->igi_version == IGMP_VERSION_3) { 1770 igmp_dispatch_queue(&qrq, 0, loop); 1771 igmp_dispatch_queue(&scq, 0, loop); 1772 1773 /* 1774 * Free the in_multi reference(s) for this 1775 * IGMP lifecycle. 1776 */ 1777 inm_release_list_deferred(&inm_free_tmp); 1778 } 1779 } 1780 1781 out_locked: 1782 IGMP_UNLOCK(); 1783 IN_MULTI_LIST_UNLOCK(); 1784 } 1785 1786 /* 1787 * Update host report group timer for IGMPv1/v2. 1788 * Will update the global pending timer flags. 1789 */ 1790 static void 1791 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1792 { 1793 int report_timer_expired; 1794 1795 IN_MULTI_LIST_LOCK_ASSERT(); 1796 IGMP_LOCK_ASSERT(); 1797 1798 if (inm->inm_timer == 0) { 1799 report_timer_expired = 0; 1800 } else if (--inm->inm_timer == 0) { 1801 report_timer_expired = 1; 1802 } else { 1803 V_current_state_timers_running = 1; 1804 return; 1805 } 1806 1807 switch (inm->inm_state) { 1808 case IGMP_NOT_MEMBER: 1809 case IGMP_SILENT_MEMBER: 1810 case IGMP_IDLE_MEMBER: 1811 case IGMP_LAZY_MEMBER: 1812 case IGMP_SLEEPING_MEMBER: 1813 case IGMP_AWAKENING_MEMBER: 1814 break; 1815 case IGMP_REPORTING_MEMBER: 1816 if (report_timer_expired) { 1817 inm->inm_state = IGMP_IDLE_MEMBER; 1818 (void)igmp_v1v2_queue_report(inm, 1819 (version == IGMP_VERSION_2) ? 1820 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1821 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1822 } 1823 break; 1824 case IGMP_G_QUERY_PENDING_MEMBER: 1825 case IGMP_SG_QUERY_PENDING_MEMBER: 1826 case IGMP_LEAVING_MEMBER: 1827 break; 1828 } 1829 } 1830 1831 /* 1832 * Update a group's timers for IGMPv3. 1833 * Will update the global pending timer flags. 1834 * Note: Unlocked read from igi. 1835 */ 1836 static void 1837 igmp_v3_process_group_timers(struct in_multi_head *inmh, 1838 struct mbufq *qrq, struct mbufq *scq, 1839 struct in_multi *inm, const int uri_fasthz) 1840 { 1841 int query_response_timer_expired; 1842 int state_change_retransmit_timer_expired; 1843 1844 IN_MULTI_LIST_LOCK_ASSERT(); 1845 IGMP_LOCK_ASSERT(); 1846 1847 query_response_timer_expired = 0; 1848 state_change_retransmit_timer_expired = 0; 1849 1850 /* 1851 * During a transition from v1/v2 compatibility mode back to v3, 1852 * a group record in REPORTING state may still have its group 1853 * timer active. This is a no-op in this function; it is easier 1854 * to deal with it here than to complicate the slow-timeout path. 1855 */ 1856 if (inm->inm_timer == 0) { 1857 query_response_timer_expired = 0; 1858 } else if (--inm->inm_timer == 0) { 1859 query_response_timer_expired = 1; 1860 } else { 1861 V_current_state_timers_running = 1; 1862 } 1863 1864 if (inm->inm_sctimer == 0) { 1865 state_change_retransmit_timer_expired = 0; 1866 } else if (--inm->inm_sctimer == 0) { 1867 state_change_retransmit_timer_expired = 1; 1868 } else { 1869 V_state_change_timers_running = 1; 1870 } 1871 1872 /* We are in fasttimo, so be quick about it. */ 1873 if (!state_change_retransmit_timer_expired && 1874 !query_response_timer_expired) 1875 return; 1876 1877 switch (inm->inm_state) { 1878 case IGMP_NOT_MEMBER: 1879 case IGMP_SILENT_MEMBER: 1880 case IGMP_SLEEPING_MEMBER: 1881 case IGMP_LAZY_MEMBER: 1882 case IGMP_AWAKENING_MEMBER: 1883 case IGMP_IDLE_MEMBER: 1884 break; 1885 case IGMP_G_QUERY_PENDING_MEMBER: 1886 case IGMP_SG_QUERY_PENDING_MEMBER: 1887 /* 1888 * Respond to a previously pending Group-Specific 1889 * or Group-and-Source-Specific query by enqueueing 1890 * the appropriate Current-State report for 1891 * immediate transmission. 1892 */ 1893 if (query_response_timer_expired) { 1894 int retval __unused; 1895 1896 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1897 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1898 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1899 __func__, retval); 1900 inm->inm_state = IGMP_REPORTING_MEMBER; 1901 /* XXX Clear recorded sources for next time. */ 1902 inm_clear_recorded(inm); 1903 } 1904 /* FALLTHROUGH */ 1905 case IGMP_REPORTING_MEMBER: 1906 case IGMP_LEAVING_MEMBER: 1907 if (state_change_retransmit_timer_expired) { 1908 /* 1909 * State-change retransmission timer fired. 1910 * If there are any further pending retransmissions, 1911 * set the global pending state-change flag, and 1912 * reset the timer. 1913 */ 1914 if (--inm->inm_scrv > 0) { 1915 inm->inm_sctimer = uri_fasthz; 1916 V_state_change_timers_running = 1; 1917 } 1918 /* 1919 * Retransmit the previously computed state-change 1920 * report. If there are no further pending 1921 * retransmissions, the mbuf queue will be consumed. 1922 * Update T0 state to T1 as we have now sent 1923 * a state-change. 1924 */ 1925 (void)igmp_v3_merge_state_changes(inm, scq); 1926 1927 inm_commit(inm); 1928 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1929 ntohl(inm->inm_addr.s_addr), 1930 inm->inm_ifp->if_xname); 1931 1932 /* 1933 * If we are leaving the group for good, make sure 1934 * we release IGMP's reference to it. 1935 * This release must be deferred using a SLIST, 1936 * as we are called from a loop which traverses 1937 * the in_ifmultiaddr TAILQ. 1938 */ 1939 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1940 inm->inm_scrv == 0) { 1941 inm->inm_state = IGMP_NOT_MEMBER; 1942 inm_rele_locked(inmh, inm); 1943 } 1944 } 1945 break; 1946 } 1947 } 1948 1949 /* 1950 * Suppress a group's pending response to a group or source/group query. 1951 * 1952 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1953 * Do NOT update ST1/ST0 as this operation merely suppresses 1954 * the currently pending group record. 1955 * Do NOT suppress the response to a general query. It is possible but 1956 * it would require adding another state or flag. 1957 */ 1958 static void 1959 igmp_v3_suppress_group_record(struct in_multi *inm) 1960 { 1961 1962 IN_MULTI_LIST_LOCK_ASSERT(); 1963 1964 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1965 ("%s: not IGMPv3 mode on link", __func__)); 1966 1967 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1968 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1969 return; 1970 1971 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1972 inm_clear_recorded(inm); 1973 1974 inm->inm_timer = 0; 1975 inm->inm_state = IGMP_REPORTING_MEMBER; 1976 } 1977 1978 /* 1979 * Switch to a different IGMP version on the given interface, 1980 * as per Section 7.2.1. 1981 */ 1982 static void 1983 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1984 { 1985 int old_version_timer; 1986 1987 IGMP_LOCK_ASSERT(); 1988 1989 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 1990 version, igi->igi_ifp, igi->igi_ifp->if_xname); 1991 1992 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 1993 /* 1994 * Compute the "Older Version Querier Present" timer as per 1995 * Section 8.12. 1996 */ 1997 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 1998 old_version_timer *= IGMP_SLOWHZ; 1999 2000 if (version == IGMP_VERSION_1) { 2001 igi->igi_v1_timer = old_version_timer; 2002 igi->igi_v2_timer = 0; 2003 } else if (version == IGMP_VERSION_2) { 2004 igi->igi_v1_timer = 0; 2005 igi->igi_v2_timer = old_version_timer; 2006 } 2007 } 2008 2009 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2010 if (igi->igi_version != IGMP_VERSION_2) { 2011 igi->igi_version = IGMP_VERSION_2; 2012 igmp_v3_cancel_link_timers(igi); 2013 } 2014 } else if (igi->igi_v1_timer > 0) { 2015 if (igi->igi_version != IGMP_VERSION_1) { 2016 igi->igi_version = IGMP_VERSION_1; 2017 igmp_v3_cancel_link_timers(igi); 2018 } 2019 } 2020 } 2021 2022 /* 2023 * Cancel pending IGMPv3 timers for the given link and all groups 2024 * joined on it; state-change, general-query, and group-query timers. 2025 * 2026 * Only ever called on a transition from v3 to Compatibility mode. Kill 2027 * the timers stone dead (this may be expensive for large N groups), they 2028 * will be restarted if Compatibility Mode deems that they must be due to 2029 * query processing. 2030 */ 2031 static void 2032 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2033 { 2034 struct ifmultiaddr *ifma; 2035 struct ifnet *ifp; 2036 struct in_multi *inm; 2037 struct in_multi_head inm_free_tmp; 2038 2039 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2040 igi->igi_ifp, igi->igi_ifp->if_xname); 2041 2042 IN_MULTI_LIST_LOCK_ASSERT(); 2043 IGMP_LOCK_ASSERT(); 2044 NET_EPOCH_ASSERT(); 2045 2046 SLIST_INIT(&inm_free_tmp); 2047 2048 /* 2049 * Stop the v3 General Query Response on this link stone dead. 2050 * If fasttimo is woken up due to V_interface_timers_running, 2051 * the flag will be cleared if there are no pending link timers. 2052 */ 2053 igi->igi_v3_timer = 0; 2054 2055 /* 2056 * Now clear the current-state and state-change report timers 2057 * for all memberships scoped to this link. 2058 */ 2059 ifp = igi->igi_ifp; 2060 IF_ADDR_WLOCK(ifp); 2061 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2062 inm = inm_ifmultiaddr_get_inm(ifma); 2063 if (inm == NULL) 2064 continue; 2065 switch (inm->inm_state) { 2066 case IGMP_NOT_MEMBER: 2067 case IGMP_SILENT_MEMBER: 2068 case IGMP_IDLE_MEMBER: 2069 case IGMP_LAZY_MEMBER: 2070 case IGMP_SLEEPING_MEMBER: 2071 case IGMP_AWAKENING_MEMBER: 2072 /* 2073 * These states are either not relevant in v3 mode, 2074 * or are unreported. Do nothing. 2075 */ 2076 break; 2077 case IGMP_LEAVING_MEMBER: 2078 /* 2079 * If we are leaving the group and switching to 2080 * compatibility mode, we need to release the final 2081 * reference held for issuing the INCLUDE {}, and 2082 * transition to REPORTING to ensure the host leave 2083 * message is sent upstream to the old querier -- 2084 * transition to NOT would lose the leave and race. 2085 */ 2086 inm_rele_locked(&inm_free_tmp, inm); 2087 /* FALLTHROUGH */ 2088 case IGMP_G_QUERY_PENDING_MEMBER: 2089 case IGMP_SG_QUERY_PENDING_MEMBER: 2090 inm_clear_recorded(inm); 2091 /* FALLTHROUGH */ 2092 case IGMP_REPORTING_MEMBER: 2093 inm->inm_state = IGMP_REPORTING_MEMBER; 2094 break; 2095 } 2096 /* 2097 * Always clear state-change and group report timers. 2098 * Free any pending IGMPv3 state-change records. 2099 */ 2100 inm->inm_sctimer = 0; 2101 inm->inm_timer = 0; 2102 mbufq_drain(&inm->inm_scq); 2103 } 2104 IF_ADDR_WUNLOCK(ifp); 2105 2106 inm_release_list_deferred(&inm_free_tmp); 2107 } 2108 2109 /* 2110 * Update the Older Version Querier Present timers for a link. 2111 * See Section 7.2.1 of RFC 3376. 2112 */ 2113 static void 2114 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2115 { 2116 2117 IGMP_LOCK_ASSERT(); 2118 2119 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2120 /* 2121 * IGMPv1 and IGMPv2 Querier Present timers expired. 2122 * 2123 * Revert to IGMPv3. 2124 */ 2125 if (V_igmp_default_version == IGMP_VERSION_3 && 2126 igi->igi_version != IGMP_VERSION_3) { 2127 CTR5(KTR_IGMPV3, 2128 "%s: transition from v%d -> v%d on %p(%s)", 2129 __func__, igi->igi_version, IGMP_VERSION_3, 2130 igi->igi_ifp, igi->igi_ifp->if_xname); 2131 igi->igi_version = IGMP_VERSION_3; 2132 } 2133 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2134 /* 2135 * IGMPv1 Querier Present timer expired, 2136 * IGMPv2 Querier Present timer running. 2137 * If IGMPv2 was disabled since last timeout, 2138 * revert to IGMPv3. 2139 * If IGMPv2 is enabled, revert to IGMPv2. 2140 */ 2141 if (V_igmp_default_version == IGMP_VERSION_3 && 2142 !V_igmp_v2enable) { 2143 CTR5(KTR_IGMPV3, 2144 "%s: transition from v%d -> v%d on %p(%s)", 2145 __func__, igi->igi_version, IGMP_VERSION_3, 2146 igi->igi_ifp, igi->igi_ifp->if_xname); 2147 igi->igi_v2_timer = 0; 2148 igi->igi_version = IGMP_VERSION_3; 2149 } else { 2150 --igi->igi_v2_timer; 2151 if (V_igmp_default_version == IGMP_VERSION_2 && 2152 igi->igi_version != IGMP_VERSION_2) { 2153 CTR5(KTR_IGMPV3, 2154 "%s: transition from v%d -> v%d on %p(%s)", 2155 __func__, igi->igi_version, IGMP_VERSION_2, 2156 igi->igi_ifp, igi->igi_ifp->if_xname); 2157 igi->igi_version = IGMP_VERSION_2; 2158 igmp_v3_cancel_link_timers(igi); 2159 } 2160 } 2161 } else if (igi->igi_v1_timer > 0) { 2162 /* 2163 * IGMPv1 Querier Present timer running. 2164 * Stop IGMPv2 timer if running. 2165 * 2166 * If IGMPv1 was disabled since last timeout, 2167 * revert to IGMPv3. 2168 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2169 */ 2170 if (V_igmp_default_version == IGMP_VERSION_3 && 2171 !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