1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2007-2009 Bruce Simpson. 5 * Copyright (c) 1988 Stephen Deering. 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Stephen Deering of Stanford University. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)igmp.c 8.1 (Berkeley) 7/19/93 37 */ 38 39 /* 40 * Internet Group Management Protocol (IGMP) routines. 41 * [RFC1112, RFC2236, RFC3376] 42 * 43 * Written by Steve Deering, Stanford, May 1988. 44 * Modified by Rosen Sharma, Stanford, Aug 1994. 45 * Modified by Bill Fenner, Xerox PARC, Feb 1995. 46 * Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995. 47 * Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson. 48 * 49 * MULTICAST Revision: 3.5.1.4 50 */ 51 52 #include <sys/cdefs.h> 53 __FBSDID("$FreeBSD$"); 54 55 #include "opt_ddb.h" 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/module.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/socket.h> 63 #include <sys/protosw.h> 64 #include <sys/kernel.h> 65 #include <sys/lock.h> 66 #include <sys/sysctl.h> 67 #include <sys/ktr.h> 68 #include <sys/condvar.h> 69 70 #ifdef DDB 71 #include <ddb/ddb.h> 72 #endif 73 74 #include <net/if.h> 75 #include <net/if_var.h> 76 #include <net/netisr.h> 77 #include <net/vnet.h> 78 79 #include <netinet/in.h> 80 #include <netinet/in_var.h> 81 #include <netinet/in_systm.h> 82 #include <netinet/ip.h> 83 #include <netinet/ip_var.h> 84 #include <netinet/ip_options.h> 85 #include <netinet/igmp.h> 86 #include <netinet/igmp_var.h> 87 88 #include <machine/in_cksum.h> 89 90 #include <security/mac/mac_framework.h> 91 92 #ifndef KTR_IGMPV3 93 #define KTR_IGMPV3 KTR_INET 94 #endif 95 96 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, 205 * protosw timers run globally (see tcp). 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 igmp_ifsoftc *igi; 674 struct ifmultiaddr *ifma, *next; 675 struct in_multi *inm; 676 struct in_multi_head inm_free_tmp; 677 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 678 ifp->if_xname); 679 680 SLIST_INIT(&inm_free_tmp); 681 IGMP_LOCK(); 682 683 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 684 if (igi->igi_version == IGMP_VERSION_3) { 685 IF_ADDR_WLOCK(ifp); 686 restart: 687 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 688 if (ifma->ifma_addr->sa_family != AF_INET || 689 ifma->ifma_protospec == NULL) 690 continue; 691 inm = (struct in_multi *)ifma->ifma_protospec; 692 if (inm->inm_state == IGMP_LEAVING_MEMBER) 693 inm_rele_locked(&inm_free_tmp, inm); 694 inm_clear_recorded(inm); 695 if (__predict_false(ifma_restart)) { 696 ifma_restart = false; 697 goto restart; 698 } 699 } 700 IF_ADDR_WUNLOCK(ifp); 701 inm_release_list_deferred(&inm_free_tmp); 702 } 703 IGMP_UNLOCK(); 704 705 } 706 707 /* 708 * Hook for domifdetach. 709 */ 710 void 711 igmp_domifdetach(struct ifnet *ifp) 712 { 713 714 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 715 __func__, ifp, ifp->if_xname); 716 717 IGMP_LOCK(); 718 igi_delete_locked(ifp); 719 IGMP_UNLOCK(); 720 } 721 722 static void 723 igi_delete_locked(const struct ifnet *ifp) 724 { 725 struct igmp_ifsoftc *igi, *tigi; 726 727 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 728 __func__, ifp, ifp->if_xname); 729 730 IGMP_LOCK_ASSERT(); 731 732 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 733 if (igi->igi_ifp == ifp) { 734 /* 735 * Free deferred General Query responses. 736 */ 737 mbufq_drain(&igi->igi_gq); 738 739 LIST_REMOVE(igi, igi_link); 740 free(igi, M_IGMP); 741 return; 742 } 743 } 744 } 745 746 /* 747 * Process a received IGMPv1 query. 748 * Return non-zero if the message should be dropped. 749 * 750 * VIMAGE: The curvnet pointer is derived from the input ifp. 751 */ 752 static int 753 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 754 const struct igmp *igmp) 755 { 756 struct ifmultiaddr *ifma; 757 struct igmp_ifsoftc *igi; 758 struct in_multi *inm; 759 760 NET_EPOCH_ASSERT(); 761 762 /* 763 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 764 * 224.0.0.1. They are always treated as General Queries. 765 * igmp_group is always ignored. Do not drop it as a userland 766 * daemon may wish to see it. 767 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 768 */ 769 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 770 IGMPSTAT_INC(igps_rcv_badqueries); 771 return (0); 772 } 773 IGMPSTAT_INC(igps_rcv_gen_queries); 774 775 IN_MULTI_LIST_LOCK(); 776 IGMP_LOCK(); 777 778 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 779 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 780 781 if (igi->igi_flags & IGIF_LOOPBACK) { 782 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 783 ifp, ifp->if_xname); 784 goto out_locked; 785 } 786 787 /* 788 * Switch to IGMPv1 host compatibility mode. 789 */ 790 igmp_set_version(igi, IGMP_VERSION_1); 791 792 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 793 794 /* 795 * Start the timers in all of our group records 796 * for the interface on which the query arrived, 797 * except those which are already running. 798 */ 799 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 800 if (ifma->ifma_addr->sa_family != AF_INET || 801 ifma->ifma_protospec == NULL) 802 continue; 803 inm = (struct in_multi *)ifma->ifma_protospec; 804 if (inm->inm_timer != 0) 805 continue; 806 switch (inm->inm_state) { 807 case IGMP_NOT_MEMBER: 808 case IGMP_SILENT_MEMBER: 809 break; 810 case IGMP_G_QUERY_PENDING_MEMBER: 811 case IGMP_SG_QUERY_PENDING_MEMBER: 812 case IGMP_REPORTING_MEMBER: 813 case IGMP_IDLE_MEMBER: 814 case IGMP_LAZY_MEMBER: 815 case IGMP_SLEEPING_MEMBER: 816 case IGMP_AWAKENING_MEMBER: 817 inm->inm_state = IGMP_REPORTING_MEMBER; 818 inm->inm_timer = IGMP_RANDOM_DELAY( 819 IGMP_V1V2_MAX_RI * PR_FASTHZ); 820 V_current_state_timers_running = 1; 821 break; 822 case IGMP_LEAVING_MEMBER: 823 break; 824 } 825 } 826 827 out_locked: 828 IGMP_UNLOCK(); 829 IN_MULTI_LIST_UNLOCK(); 830 831 return (0); 832 } 833 834 /* 835 * Process a received IGMPv2 general or group-specific query. 836 */ 837 static int 838 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 839 const struct igmp *igmp) 840 { 841 struct ifmultiaddr *ifma; 842 struct igmp_ifsoftc *igi; 843 struct in_multi *inm; 844 int is_general_query; 845 uint16_t timer; 846 847 NET_EPOCH_ASSERT(); 848 849 is_general_query = 0; 850 851 /* 852 * Validate address fields upfront. 853 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 854 */ 855 if (in_nullhost(igmp->igmp_group)) { 856 /* 857 * IGMPv2 General Query. 858 * If this was not sent to the all-hosts group, ignore it. 859 */ 860 if (!in_allhosts(ip->ip_dst)) 861 return (0); 862 IGMPSTAT_INC(igps_rcv_gen_queries); 863 is_general_query = 1; 864 } else { 865 /* IGMPv2 Group-Specific Query. */ 866 IGMPSTAT_INC(igps_rcv_group_queries); 867 } 868 869 IN_MULTI_LIST_LOCK(); 870 IGMP_LOCK(); 871 872 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 873 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 874 875 if (igi->igi_flags & IGIF_LOOPBACK) { 876 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 877 ifp, ifp->if_xname); 878 goto out_locked; 879 } 880 881 /* 882 * Ignore v2 query if in v1 Compatibility Mode. 883 */ 884 if (igi->igi_version == IGMP_VERSION_1) 885 goto out_locked; 886 887 igmp_set_version(igi, IGMP_VERSION_2); 888 889 timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE; 890 if (timer == 0) 891 timer = 1; 892 893 if (is_general_query) { 894 /* 895 * For each reporting group joined on this 896 * interface, kick the report timer. 897 */ 898 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 899 ifp, ifp->if_xname); 900 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 901 if (ifma->ifma_addr->sa_family != AF_INET || 902 ifma->ifma_protospec == NULL) 903 continue; 904 inm = (struct in_multi *)ifma->ifma_protospec; 905 igmp_v2_update_group(inm, timer); 906 } 907 } else { 908 /* 909 * Group-specific IGMPv2 query, we need only 910 * look up the single group to process it. 911 */ 912 inm = inm_lookup(ifp, igmp->igmp_group); 913 if (inm != NULL) { 914 CTR3(KTR_IGMPV3, 915 "process v2 query 0x%08x on ifp %p(%s)", 916 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 917 igmp_v2_update_group(inm, timer); 918 } 919 } 920 921 out_locked: 922 IGMP_UNLOCK(); 923 IN_MULTI_LIST_UNLOCK(); 924 925 return (0); 926 } 927 928 /* 929 * Update the report timer on a group in response to an IGMPv2 query. 930 * 931 * If we are becoming the reporting member for this group, start the timer. 932 * If we already are the reporting member for this group, and timer is 933 * below the threshold, reset it. 934 * 935 * We may be updating the group for the first time since we switched 936 * to IGMPv3. If we are, then we must clear any recorded source lists, 937 * and transition to REPORTING state; the group timer is overloaded 938 * for group and group-source query responses. 939 * 940 * Unlike IGMPv3, the delay per group should be jittered 941 * to avoid bursts of IGMPv2 reports. 942 */ 943 static void 944 igmp_v2_update_group(struct in_multi *inm, const int timer) 945 { 946 947 CTR4(KTR_IGMPV3, "0x%08x: %s/%s timer=%d", __func__, 948 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname, timer); 949 950 IN_MULTI_LIST_LOCK_ASSERT(); 951 952 switch (inm->inm_state) { 953 case IGMP_NOT_MEMBER: 954 case IGMP_SILENT_MEMBER: 955 break; 956 case IGMP_REPORTING_MEMBER: 957 if (inm->inm_timer != 0 && 958 inm->inm_timer <= timer) { 959 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 960 "skipping.", __func__); 961 break; 962 } 963 /* FALLTHROUGH */ 964 case IGMP_SG_QUERY_PENDING_MEMBER: 965 case IGMP_G_QUERY_PENDING_MEMBER: 966 case IGMP_IDLE_MEMBER: 967 case IGMP_LAZY_MEMBER: 968 case IGMP_AWAKENING_MEMBER: 969 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 970 inm->inm_state = IGMP_REPORTING_MEMBER; 971 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 972 V_current_state_timers_running = 1; 973 break; 974 case IGMP_SLEEPING_MEMBER: 975 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 976 inm->inm_state = IGMP_AWAKENING_MEMBER; 977 break; 978 case IGMP_LEAVING_MEMBER: 979 break; 980 } 981 } 982 983 /* 984 * Process a received IGMPv3 general, group-specific or 985 * group-and-source-specific query. 986 * Assumes m has already been pulled up to the full IGMP message length. 987 * Return 0 if successful, otherwise an appropriate error code is returned. 988 */ 989 static int 990 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 991 /*const*/ struct igmpv3 *igmpv3) 992 { 993 struct igmp_ifsoftc *igi; 994 struct in_multi *inm; 995 int is_general_query; 996 uint32_t maxresp, nsrc, qqi; 997 uint16_t timer; 998 uint8_t qrv; 999 1000 is_general_query = 0; 1001 1002 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 1003 1004 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 1005 if (maxresp >= 128) { 1006 maxresp = IGMP_MANT(igmpv3->igmp_code) << 1007 (IGMP_EXP(igmpv3->igmp_code) + 3); 1008 } 1009 1010 /* 1011 * Robustness must never be less than 2 for on-wire IGMPv3. 1012 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 1013 * an exception for interfaces whose IGMPv3 state changes 1014 * are redirected to loopback (e.g. MANET). 1015 */ 1016 qrv = IGMP_QRV(igmpv3->igmp_misc); 1017 if (qrv < 2) { 1018 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 1019 qrv, IGMP_RV_INIT); 1020 qrv = IGMP_RV_INIT; 1021 } 1022 1023 qqi = igmpv3->igmp_qqi; 1024 if (qqi >= 128) { 1025 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 1026 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 1027 } 1028 1029 timer = maxresp * PR_FASTHZ / IGMP_TIMER_SCALE; 1030 if (timer == 0) 1031 timer = 1; 1032 1033 nsrc = ntohs(igmpv3->igmp_numsrc); 1034 1035 /* 1036 * Validate address fields and versions upfront before 1037 * accepting v3 query. 1038 * XXX SMPng: Unlocked access to igmpstat counters here. 1039 */ 1040 if (in_nullhost(igmpv3->igmp_group)) { 1041 /* 1042 * IGMPv3 General Query. 1043 * 1044 * General Queries SHOULD be directed to 224.0.0.1. 1045 * A general query with a source list has undefined 1046 * behaviour; discard it. 1047 */ 1048 IGMPSTAT_INC(igps_rcv_gen_queries); 1049 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1050 IGMPSTAT_INC(igps_rcv_badqueries); 1051 return (0); 1052 } 1053 is_general_query = 1; 1054 } else { 1055 /* Group or group-source specific query. */ 1056 if (nsrc == 0) 1057 IGMPSTAT_INC(igps_rcv_group_queries); 1058 else 1059 IGMPSTAT_INC(igps_rcv_gsr_queries); 1060 } 1061 1062 IN_MULTI_LIST_LOCK(); 1063 IGMP_LOCK(); 1064 1065 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1066 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1067 1068 if (igi->igi_flags & IGIF_LOOPBACK) { 1069 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1070 ifp, ifp->if_xname); 1071 goto out_locked; 1072 } 1073 1074 /* 1075 * Discard the v3 query if we're in Compatibility Mode. 1076 * The RFC is not obviously worded that hosts need to stay in 1077 * compatibility mode until the Old Version Querier Present 1078 * timer expires. 1079 */ 1080 if (igi->igi_version != IGMP_VERSION_3) { 1081 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1082 igi->igi_version, ifp, ifp->if_xname); 1083 goto out_locked; 1084 } 1085 1086 igmp_set_version(igi, IGMP_VERSION_3); 1087 igi->igi_rv = qrv; 1088 igi->igi_qi = qqi; 1089 igi->igi_qri = maxresp; 1090 1091 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1092 maxresp); 1093 1094 if (is_general_query) { 1095 /* 1096 * Schedule a current-state report on this ifp for 1097 * all groups, possibly containing source lists. 1098 * If there is a pending General Query response 1099 * scheduled earlier than the selected delay, do 1100 * not schedule any other reports. 1101 * Otherwise, reset the interface timer. 1102 */ 1103 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1104 ifp, ifp->if_xname); 1105 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1106 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1107 V_interface_timers_running = 1; 1108 } 1109 } else { 1110 /* 1111 * Group-source-specific queries are throttled on 1112 * a per-group basis to defeat denial-of-service attempts. 1113 * Queries for groups we are not a member of on this 1114 * link are simply ignored. 1115 */ 1116 inm = inm_lookup(ifp, igmpv3->igmp_group); 1117 if (inm == NULL) 1118 goto out_locked; 1119 if (nsrc > 0) { 1120 if (!ratecheck(&inm->inm_lastgsrtv, 1121 &V_igmp_gsrdelay)) { 1122 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1123 __func__); 1124 IGMPSTAT_INC(igps_drop_gsr_queries); 1125 goto out_locked; 1126 } 1127 } 1128 CTR3(KTR_IGMPV3, "process v3 0x%08x query on ifp %p(%s)", 1129 ntohl(igmpv3->igmp_group.s_addr), ifp, ifp->if_xname); 1130 /* 1131 * If there is a pending General Query response 1132 * scheduled sooner than the selected delay, no 1133 * further report need be scheduled. 1134 * Otherwise, prepare to respond to the 1135 * group-specific or group-and-source query. 1136 */ 1137 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1138 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1139 } 1140 1141 out_locked: 1142 IGMP_UNLOCK(); 1143 IN_MULTI_LIST_UNLOCK(); 1144 1145 return (0); 1146 } 1147 1148 /* 1149 * Process a received IGMPv3 group-specific or group-and-source-specific 1150 * query. 1151 * Return <0 if any error occurred. Currently this is ignored. 1152 */ 1153 static int 1154 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1155 int timer, /*const*/ struct igmpv3 *igmpv3) 1156 { 1157 int retval; 1158 uint16_t nsrc; 1159 1160 IN_MULTI_LIST_LOCK_ASSERT(); 1161 IGMP_LOCK_ASSERT(); 1162 1163 retval = 0; 1164 1165 switch (inm->inm_state) { 1166 case IGMP_NOT_MEMBER: 1167 case IGMP_SILENT_MEMBER: 1168 case IGMP_SLEEPING_MEMBER: 1169 case IGMP_LAZY_MEMBER: 1170 case IGMP_AWAKENING_MEMBER: 1171 case IGMP_IDLE_MEMBER: 1172 case IGMP_LEAVING_MEMBER: 1173 return (retval); 1174 break; 1175 case IGMP_REPORTING_MEMBER: 1176 case IGMP_G_QUERY_PENDING_MEMBER: 1177 case IGMP_SG_QUERY_PENDING_MEMBER: 1178 break; 1179 } 1180 1181 nsrc = ntohs(igmpv3->igmp_numsrc); 1182 1183 /* 1184 * Deal with group-specific queries upfront. 1185 * If any group query is already pending, purge any recorded 1186 * source-list state if it exists, and schedule a query response 1187 * for this group-specific query. 1188 */ 1189 if (nsrc == 0) { 1190 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1191 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1192 inm_clear_recorded(inm); 1193 timer = min(inm->inm_timer, timer); 1194 } 1195 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1196 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1197 V_current_state_timers_running = 1; 1198 return (retval); 1199 } 1200 1201 /* 1202 * Deal with the case where a group-and-source-specific query has 1203 * been received but a group-specific query is already pending. 1204 */ 1205 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1206 timer = min(inm->inm_timer, timer); 1207 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1208 V_current_state_timers_running = 1; 1209 return (retval); 1210 } 1211 1212 /* 1213 * Finally, deal with the case where a group-and-source-specific 1214 * query has been received, where a response to a previous g-s-r 1215 * query exists, or none exists. 1216 * In this case, we need to parse the source-list which the Querier 1217 * has provided us with and check if we have any source list filter 1218 * entries at T1 for these sources. If we do not, there is no need 1219 * schedule a report and the query may be dropped. 1220 * If we do, we must record them and schedule a current-state 1221 * report for those sources. 1222 * FIXME: Handling source lists larger than 1 mbuf requires that 1223 * we pass the mbuf chain pointer down to this function, and use 1224 * m_getptr() to walk the chain. 1225 */ 1226 if (inm->inm_nsrc > 0) { 1227 const struct in_addr *ap; 1228 int i, nrecorded; 1229 1230 ap = (const struct in_addr *)(igmpv3 + 1); 1231 nrecorded = 0; 1232 for (i = 0; i < nsrc; i++, ap++) { 1233 retval = inm_record_source(inm, ap->s_addr); 1234 if (retval < 0) 1235 break; 1236 nrecorded += retval; 1237 } 1238 if (nrecorded > 0) { 1239 CTR1(KTR_IGMPV3, 1240 "%s: schedule response to SG query", __func__); 1241 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1242 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1243 V_current_state_timers_running = 1; 1244 } 1245 } 1246 1247 return (retval); 1248 } 1249 1250 /* 1251 * Process a received IGMPv1 host membership report. 1252 * 1253 * NOTE: 0.0.0.0 workaround breaks const correctness. 1254 */ 1255 static int 1256 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1257 /*const*/ struct igmp *igmp) 1258 { 1259 struct in_ifaddr *ia; 1260 struct in_multi *inm; 1261 1262 IGMPSTAT_INC(igps_rcv_reports); 1263 1264 if (ifp->if_flags & IFF_LOOPBACK) 1265 return (0); 1266 1267 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1268 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1269 IGMPSTAT_INC(igps_rcv_badreports); 1270 return (EINVAL); 1271 } 1272 1273 /* 1274 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1275 * Booting clients may use the source address 0.0.0.0. Some 1276 * IGMP daemons may not know how to use IP_RECVIF to determine 1277 * the interface upon which this message was received. 1278 * Replace 0.0.0.0 with the subnet address if told to do so. 1279 */ 1280 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1281 IFP_TO_IA(ifp, ia); 1282 if (ia != NULL) 1283 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1284 } 1285 1286 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1287 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1288 1289 /* 1290 * IGMPv1 report suppression. 1291 * If we are a member of this group, and our membership should be 1292 * reported, stop our group timer and transition to the 'lazy' state. 1293 */ 1294 IN_MULTI_LIST_LOCK(); 1295 inm = inm_lookup(ifp, igmp->igmp_group); 1296 if (inm != NULL) { 1297 struct igmp_ifsoftc *igi; 1298 1299 igi = inm->inm_igi; 1300 if (igi == NULL) { 1301 KASSERT(igi != NULL, 1302 ("%s: no igi for ifp %p", __func__, ifp)); 1303 goto out_locked; 1304 } 1305 1306 IGMPSTAT_INC(igps_rcv_ourreports); 1307 1308 /* 1309 * If we are in IGMPv3 host mode, do not allow the 1310 * other host's IGMPv1 report to suppress our reports 1311 * unless explicitly configured to do so. 1312 */ 1313 if (igi->igi_version == IGMP_VERSION_3) { 1314 if (V_igmp_legacysupp) 1315 igmp_v3_suppress_group_record(inm); 1316 goto out_locked; 1317 } 1318 1319 inm->inm_timer = 0; 1320 1321 switch (inm->inm_state) { 1322 case IGMP_NOT_MEMBER: 1323 case IGMP_SILENT_MEMBER: 1324 break; 1325 case IGMP_IDLE_MEMBER: 1326 case IGMP_LAZY_MEMBER: 1327 case IGMP_AWAKENING_MEMBER: 1328 CTR3(KTR_IGMPV3, 1329 "report suppressed for 0x%08x on ifp %p(%s)", 1330 ntohl(igmp->igmp_group.s_addr), ifp, 1331 ifp->if_xname); 1332 case IGMP_SLEEPING_MEMBER: 1333 inm->inm_state = IGMP_SLEEPING_MEMBER; 1334 break; 1335 case IGMP_REPORTING_MEMBER: 1336 CTR3(KTR_IGMPV3, 1337 "report suppressed for 0x%08x on ifp %p(%s)", 1338 ntohl(igmp->igmp_group.s_addr), ifp, 1339 ifp->if_xname); 1340 if (igi->igi_version == IGMP_VERSION_1) 1341 inm->inm_state = IGMP_LAZY_MEMBER; 1342 else if (igi->igi_version == IGMP_VERSION_2) 1343 inm->inm_state = IGMP_SLEEPING_MEMBER; 1344 break; 1345 case IGMP_G_QUERY_PENDING_MEMBER: 1346 case IGMP_SG_QUERY_PENDING_MEMBER: 1347 case IGMP_LEAVING_MEMBER: 1348 break; 1349 } 1350 } 1351 1352 out_locked: 1353 IN_MULTI_LIST_UNLOCK(); 1354 1355 return (0); 1356 } 1357 1358 /* 1359 * Process a received IGMPv2 host membership report. 1360 * 1361 * NOTE: 0.0.0.0 workaround breaks const correctness. 1362 */ 1363 static int 1364 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1365 /*const*/ struct igmp *igmp) 1366 { 1367 struct in_ifaddr *ia; 1368 struct in_multi *inm; 1369 1370 /* 1371 * Make sure we don't hear our own membership report. Fast 1372 * leave requires knowing that we are the only member of a 1373 * group. 1374 */ 1375 IFP_TO_IA(ifp, ia); 1376 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1377 return (0); 1378 } 1379 1380 IGMPSTAT_INC(igps_rcv_reports); 1381 1382 if (ifp->if_flags & IFF_LOOPBACK) { 1383 return (0); 1384 } 1385 1386 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1387 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1388 IGMPSTAT_INC(igps_rcv_badreports); 1389 return (EINVAL); 1390 } 1391 1392 /* 1393 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1394 * Booting clients may use the source address 0.0.0.0. Some 1395 * IGMP daemons may not know how to use IP_RECVIF to determine 1396 * the interface upon which this message was received. 1397 * Replace 0.0.0.0 with the subnet address if told to do so. 1398 */ 1399 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1400 if (ia != NULL) 1401 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1402 } 1403 1404 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1405 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1406 1407 /* 1408 * IGMPv2 report suppression. 1409 * If we are a member of this group, and our membership should be 1410 * reported, and our group timer is pending or about to be reset, 1411 * stop our group timer by transitioning to the 'lazy' state. 1412 */ 1413 IN_MULTI_LIST_LOCK(); 1414 inm = inm_lookup(ifp, igmp->igmp_group); 1415 if (inm != NULL) { 1416 struct igmp_ifsoftc *igi; 1417 1418 igi = inm->inm_igi; 1419 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1420 1421 IGMPSTAT_INC(igps_rcv_ourreports); 1422 1423 /* 1424 * If we are in IGMPv3 host mode, do not allow the 1425 * other host's IGMPv1 report to suppress our reports 1426 * unless explicitly configured to do so. 1427 */ 1428 if (igi->igi_version == IGMP_VERSION_3) { 1429 if (V_igmp_legacysupp) 1430 igmp_v3_suppress_group_record(inm); 1431 goto out_locked; 1432 } 1433 1434 inm->inm_timer = 0; 1435 1436 switch (inm->inm_state) { 1437 case IGMP_NOT_MEMBER: 1438 case IGMP_SILENT_MEMBER: 1439 case IGMP_SLEEPING_MEMBER: 1440 break; 1441 case IGMP_REPORTING_MEMBER: 1442 case IGMP_IDLE_MEMBER: 1443 case IGMP_AWAKENING_MEMBER: 1444 CTR3(KTR_IGMPV3, 1445 "report suppressed for 0x%08x on ifp %p(%s)", 1446 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1447 case IGMP_LAZY_MEMBER: 1448 inm->inm_state = IGMP_LAZY_MEMBER; 1449 break; 1450 case IGMP_G_QUERY_PENDING_MEMBER: 1451 case IGMP_SG_QUERY_PENDING_MEMBER: 1452 case IGMP_LEAVING_MEMBER: 1453 break; 1454 } 1455 } 1456 1457 out_locked: 1458 IN_MULTI_LIST_UNLOCK(); 1459 1460 return (0); 1461 } 1462 1463 int 1464 igmp_input(struct mbuf **mp, int *offp, int proto) 1465 { 1466 int iphlen; 1467 struct ifnet *ifp; 1468 struct igmp *igmp; 1469 struct ip *ip; 1470 struct mbuf *m; 1471 int igmplen; 1472 int minlen; 1473 int queryver; 1474 1475 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1476 1477 m = *mp; 1478 ifp = m->m_pkthdr.rcvif; 1479 *mp = NULL; 1480 1481 IGMPSTAT_INC(igps_rcv_total); 1482 1483 ip = mtod(m, struct ip *); 1484 iphlen = *offp; 1485 igmplen = ntohs(ip->ip_len) - iphlen; 1486 1487 /* 1488 * Validate lengths. 1489 */ 1490 if (igmplen < IGMP_MINLEN) { 1491 IGMPSTAT_INC(igps_rcv_tooshort); 1492 m_freem(m); 1493 return (IPPROTO_DONE); 1494 } 1495 1496 /* 1497 * Always pullup to the minimum size for v1/v2 or v3 1498 * to amortize calls to m_pullup(). 1499 */ 1500 minlen = iphlen; 1501 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1502 minlen += IGMP_V3_QUERY_MINLEN; 1503 else 1504 minlen += IGMP_MINLEN; 1505 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1506 (m = m_pullup(m, minlen)) == NULL) { 1507 IGMPSTAT_INC(igps_rcv_tooshort); 1508 return (IPPROTO_DONE); 1509 } 1510 ip = mtod(m, struct ip *); 1511 1512 /* 1513 * Validate checksum. 1514 */ 1515 m->m_data += iphlen; 1516 m->m_len -= iphlen; 1517 igmp = mtod(m, struct igmp *); 1518 if (in_cksum(m, igmplen)) { 1519 IGMPSTAT_INC(igps_rcv_badsum); 1520 m_freem(m); 1521 return (IPPROTO_DONE); 1522 } 1523 m->m_data -= iphlen; 1524 m->m_len += iphlen; 1525 1526 /* 1527 * IGMP control traffic is link-scope, and must have a TTL of 1. 1528 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1529 * probe packets may come from beyond the LAN. 1530 */ 1531 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1532 IGMPSTAT_INC(igps_rcv_badttl); 1533 m_freem(m); 1534 return (IPPROTO_DONE); 1535 } 1536 1537 switch (igmp->igmp_type) { 1538 case IGMP_HOST_MEMBERSHIP_QUERY: 1539 if (igmplen == IGMP_MINLEN) { 1540 if (igmp->igmp_code == 0) 1541 queryver = IGMP_VERSION_1; 1542 else 1543 queryver = IGMP_VERSION_2; 1544 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1545 queryver = IGMP_VERSION_3; 1546 } else { 1547 IGMPSTAT_INC(igps_rcv_tooshort); 1548 m_freem(m); 1549 return (IPPROTO_DONE); 1550 } 1551 1552 switch (queryver) { 1553 case IGMP_VERSION_1: 1554 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1555 if (!V_igmp_v1enable) 1556 break; 1557 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1558 m_freem(m); 1559 return (IPPROTO_DONE); 1560 } 1561 break; 1562 1563 case IGMP_VERSION_2: 1564 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1565 if (!V_igmp_v2enable) 1566 break; 1567 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1568 m_freem(m); 1569 return (IPPROTO_DONE); 1570 } 1571 break; 1572 1573 case IGMP_VERSION_3: { 1574 struct igmpv3 *igmpv3; 1575 uint16_t igmpv3len; 1576 uint16_t nsrc; 1577 1578 IGMPSTAT_INC(igps_rcv_v3_queries); 1579 igmpv3 = (struct igmpv3 *)igmp; 1580 /* 1581 * Validate length based on source count. 1582 */ 1583 nsrc = ntohs(igmpv3->igmp_numsrc); 1584 if (nsrc * sizeof(in_addr_t) > 1585 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1586 IGMPSTAT_INC(igps_rcv_tooshort); 1587 m_freem(m); 1588 return (IPPROTO_DONE); 1589 } 1590 /* 1591 * m_pullup() may modify m, so pullup in 1592 * this scope. 1593 */ 1594 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1595 sizeof(struct in_addr) * nsrc; 1596 if ((!M_WRITABLE(m) || 1597 m->m_len < igmpv3len) && 1598 (m = m_pullup(m, igmpv3len)) == NULL) { 1599 IGMPSTAT_INC(igps_rcv_tooshort); 1600 return (IPPROTO_DONE); 1601 } 1602 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1603 + iphlen); 1604 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1605 m_freem(m); 1606 return (IPPROTO_DONE); 1607 } 1608 } 1609 break; 1610 } 1611 break; 1612 1613 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1614 if (!V_igmp_v1enable) 1615 break; 1616 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1617 m_freem(m); 1618 return (IPPROTO_DONE); 1619 } 1620 break; 1621 1622 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1623 if (!V_igmp_v2enable) 1624 break; 1625 if (!ip_checkrouteralert(m)) 1626 IGMPSTAT_INC(igps_rcv_nora); 1627 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1628 m_freem(m); 1629 return (IPPROTO_DONE); 1630 } 1631 break; 1632 1633 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1634 /* 1635 * Hosts do not need to process IGMPv3 membership reports, 1636 * as report suppression is no longer required. 1637 */ 1638 if (!ip_checkrouteralert(m)) 1639 IGMPSTAT_INC(igps_rcv_nora); 1640 break; 1641 1642 default: 1643 break; 1644 } 1645 1646 /* 1647 * Pass all valid IGMP packets up to any process(es) listening on a 1648 * raw IGMP socket. 1649 */ 1650 *mp = m; 1651 return (rip_input(mp, offp, proto)); 1652 } 1653 1654 /* 1655 * Fast timeout handler (global). 1656 * VIMAGE: Timeout handlers are expected to service all vimages. 1657 */ 1658 void 1659 igmp_fasttimo(void) 1660 { 1661 VNET_ITERATOR_DECL(vnet_iter); 1662 1663 VNET_LIST_RLOCK_NOSLEEP(); 1664 VNET_FOREACH(vnet_iter) { 1665 CURVNET_SET(vnet_iter); 1666 igmp_fasttimo_vnet(); 1667 CURVNET_RESTORE(); 1668 } 1669 VNET_LIST_RUNLOCK_NOSLEEP(); 1670 } 1671 1672 /* 1673 * Fast timeout handler (per-vnet). 1674 * Sends are shuffled off to a netisr to deal with Giant. 1675 * 1676 * VIMAGE: Assume caller has set up our curvnet. 1677 */ 1678 static void 1679 igmp_fasttimo_vnet(void) 1680 { 1681 struct mbufq scq; /* State-change packets */ 1682 struct mbufq qrq; /* Query response packets */ 1683 struct ifnet *ifp; 1684 struct igmp_ifsoftc *igi; 1685 struct ifmultiaddr *ifma, *next; 1686 struct in_multi *inm; 1687 struct in_multi_head inm_free_tmp; 1688 int loop, uri_fasthz; 1689 1690 loop = 0; 1691 uri_fasthz = 0; 1692 1693 /* 1694 * Quick check to see if any work needs to be done, in order to 1695 * minimize the overhead of fasttimo processing. 1696 * SMPng: XXX Unlocked reads. 1697 */ 1698 if (!V_current_state_timers_running && 1699 !V_interface_timers_running && 1700 !V_state_change_timers_running) 1701 return; 1702 1703 SLIST_INIT(&inm_free_tmp); 1704 IN_MULTI_LIST_LOCK(); 1705 IGMP_LOCK(); 1706 1707 /* 1708 * IGMPv3 General Query response timer processing. 1709 */ 1710 if (V_interface_timers_running) { 1711 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1712 1713 V_interface_timers_running = 0; 1714 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1715 if (igi->igi_v3_timer == 0) { 1716 /* Do nothing. */ 1717 } else if (--igi->igi_v3_timer == 0) { 1718 igmp_v3_dispatch_general_query(igi); 1719 } else { 1720 V_interface_timers_running = 1; 1721 } 1722 } 1723 } 1724 1725 if (!V_current_state_timers_running && 1726 !V_state_change_timers_running) 1727 goto out_locked; 1728 1729 V_current_state_timers_running = 0; 1730 V_state_change_timers_running = 0; 1731 1732 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1733 1734 /* 1735 * IGMPv1/v2/v3 host report and state-change timer processing. 1736 * Note: Processing a v3 group timer may remove a node. 1737 */ 1738 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1739 ifp = igi->igi_ifp; 1740 1741 if (igi->igi_version == IGMP_VERSION_3) { 1742 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1743 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1744 PR_FASTHZ); 1745 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1746 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1747 } 1748 1749 IF_ADDR_WLOCK(ifp); 1750 restart: 1751 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 1752 if (ifma->ifma_addr->sa_family != AF_INET || 1753 ifma->ifma_protospec == NULL) 1754 continue; 1755 inm = (struct in_multi *)ifma->ifma_protospec; 1756 switch (igi->igi_version) { 1757 case IGMP_VERSION_1: 1758 case IGMP_VERSION_2: 1759 igmp_v1v2_process_group_timer(inm, 1760 igi->igi_version); 1761 break; 1762 case IGMP_VERSION_3: 1763 igmp_v3_process_group_timers(&inm_free_tmp, &qrq, 1764 &scq, inm, uri_fasthz); 1765 break; 1766 } 1767 if (__predict_false(ifma_restart)) { 1768 ifma_restart = false; 1769 goto restart; 1770 } 1771 } 1772 IF_ADDR_WUNLOCK(ifp); 1773 1774 if (igi->igi_version == IGMP_VERSION_3) { 1775 igmp_dispatch_queue(&qrq, 0, loop); 1776 igmp_dispatch_queue(&scq, 0, loop); 1777 1778 /* 1779 * Free the in_multi reference(s) for this 1780 * IGMP lifecycle. 1781 */ 1782 inm_release_list_deferred(&inm_free_tmp); 1783 } 1784 } 1785 1786 out_locked: 1787 IGMP_UNLOCK(); 1788 IN_MULTI_LIST_UNLOCK(); 1789 } 1790 1791 /* 1792 * Update host report group timer for IGMPv1/v2. 1793 * Will update the global pending timer flags. 1794 */ 1795 static void 1796 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1797 { 1798 int report_timer_expired; 1799 1800 IN_MULTI_LIST_LOCK_ASSERT(); 1801 IGMP_LOCK_ASSERT(); 1802 1803 if (inm->inm_timer == 0) { 1804 report_timer_expired = 0; 1805 } else if (--inm->inm_timer == 0) { 1806 report_timer_expired = 1; 1807 } else { 1808 V_current_state_timers_running = 1; 1809 return; 1810 } 1811 1812 switch (inm->inm_state) { 1813 case IGMP_NOT_MEMBER: 1814 case IGMP_SILENT_MEMBER: 1815 case IGMP_IDLE_MEMBER: 1816 case IGMP_LAZY_MEMBER: 1817 case IGMP_SLEEPING_MEMBER: 1818 case IGMP_AWAKENING_MEMBER: 1819 break; 1820 case IGMP_REPORTING_MEMBER: 1821 if (report_timer_expired) { 1822 inm->inm_state = IGMP_IDLE_MEMBER; 1823 (void)igmp_v1v2_queue_report(inm, 1824 (version == IGMP_VERSION_2) ? 1825 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1826 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1827 } 1828 break; 1829 case IGMP_G_QUERY_PENDING_MEMBER: 1830 case IGMP_SG_QUERY_PENDING_MEMBER: 1831 case IGMP_LEAVING_MEMBER: 1832 break; 1833 } 1834 } 1835 1836 /* 1837 * Update a group's timers for IGMPv3. 1838 * Will update the global pending timer flags. 1839 * Note: Unlocked read from igi. 1840 */ 1841 static void 1842 igmp_v3_process_group_timers(struct in_multi_head *inmh, 1843 struct mbufq *qrq, struct mbufq *scq, 1844 struct in_multi *inm, const int uri_fasthz) 1845 { 1846 int query_response_timer_expired; 1847 int state_change_retransmit_timer_expired; 1848 1849 IN_MULTI_LIST_LOCK_ASSERT(); 1850 IGMP_LOCK_ASSERT(); 1851 1852 query_response_timer_expired = 0; 1853 state_change_retransmit_timer_expired = 0; 1854 1855 /* 1856 * During a transition from v1/v2 compatibility mode back to v3, 1857 * a group record in REPORTING state may still have its group 1858 * timer active. This is a no-op in this function; it is easier 1859 * to deal with it here than to complicate the slow-timeout path. 1860 */ 1861 if (inm->inm_timer == 0) { 1862 query_response_timer_expired = 0; 1863 } else if (--inm->inm_timer == 0) { 1864 query_response_timer_expired = 1; 1865 } else { 1866 V_current_state_timers_running = 1; 1867 } 1868 1869 if (inm->inm_sctimer == 0) { 1870 state_change_retransmit_timer_expired = 0; 1871 } else if (--inm->inm_sctimer == 0) { 1872 state_change_retransmit_timer_expired = 1; 1873 } else { 1874 V_state_change_timers_running = 1; 1875 } 1876 1877 /* We are in fasttimo, so be quick about it. */ 1878 if (!state_change_retransmit_timer_expired && 1879 !query_response_timer_expired) 1880 return; 1881 1882 switch (inm->inm_state) { 1883 case IGMP_NOT_MEMBER: 1884 case IGMP_SILENT_MEMBER: 1885 case IGMP_SLEEPING_MEMBER: 1886 case IGMP_LAZY_MEMBER: 1887 case IGMP_AWAKENING_MEMBER: 1888 case IGMP_IDLE_MEMBER: 1889 break; 1890 case IGMP_G_QUERY_PENDING_MEMBER: 1891 case IGMP_SG_QUERY_PENDING_MEMBER: 1892 /* 1893 * Respond to a previously pending Group-Specific 1894 * or Group-and-Source-Specific query by enqueueing 1895 * the appropriate Current-State report for 1896 * immediate transmission. 1897 */ 1898 if (query_response_timer_expired) { 1899 int retval __unused; 1900 1901 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1902 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1903 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1904 __func__, retval); 1905 inm->inm_state = IGMP_REPORTING_MEMBER; 1906 /* XXX Clear recorded sources for next time. */ 1907 inm_clear_recorded(inm); 1908 } 1909 /* FALLTHROUGH */ 1910 case IGMP_REPORTING_MEMBER: 1911 case IGMP_LEAVING_MEMBER: 1912 if (state_change_retransmit_timer_expired) { 1913 /* 1914 * State-change retransmission timer fired. 1915 * If there are any further pending retransmissions, 1916 * set the global pending state-change flag, and 1917 * reset the timer. 1918 */ 1919 if (--inm->inm_scrv > 0) { 1920 inm->inm_sctimer = uri_fasthz; 1921 V_state_change_timers_running = 1; 1922 } 1923 /* 1924 * Retransmit the previously computed state-change 1925 * report. If there are no further pending 1926 * retransmissions, the mbuf queue will be consumed. 1927 * Update T0 state to T1 as we have now sent 1928 * a state-change. 1929 */ 1930 (void)igmp_v3_merge_state_changes(inm, scq); 1931 1932 inm_commit(inm); 1933 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1934 ntohl(inm->inm_addr.s_addr), 1935 inm->inm_ifp->if_xname); 1936 1937 /* 1938 * If we are leaving the group for good, make sure 1939 * we release IGMP's reference to it. 1940 * This release must be deferred using a SLIST, 1941 * as we are called from a loop which traverses 1942 * the in_ifmultiaddr TAILQ. 1943 */ 1944 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1945 inm->inm_scrv == 0) { 1946 inm->inm_state = IGMP_NOT_MEMBER; 1947 inm_rele_locked(inmh, inm); 1948 } 1949 } 1950 break; 1951 } 1952 } 1953 1954 /* 1955 * Suppress a group's pending response to a group or source/group query. 1956 * 1957 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1958 * Do NOT update ST1/ST0 as this operation merely suppresses 1959 * the currently pending group record. 1960 * Do NOT suppress the response to a general query. It is possible but 1961 * it would require adding another state or flag. 1962 */ 1963 static void 1964 igmp_v3_suppress_group_record(struct in_multi *inm) 1965 { 1966 1967 IN_MULTI_LIST_LOCK_ASSERT(); 1968 1969 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1970 ("%s: not IGMPv3 mode on link", __func__)); 1971 1972 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1973 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1974 return; 1975 1976 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1977 inm_clear_recorded(inm); 1978 1979 inm->inm_timer = 0; 1980 inm->inm_state = IGMP_REPORTING_MEMBER; 1981 } 1982 1983 /* 1984 * Switch to a different IGMP version on the given interface, 1985 * as per Section 7.2.1. 1986 */ 1987 static void 1988 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1989 { 1990 int old_version_timer; 1991 1992 IGMP_LOCK_ASSERT(); 1993 1994 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 1995 version, igi->igi_ifp, igi->igi_ifp->if_xname); 1996 1997 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 1998 /* 1999 * Compute the "Older Version Querier Present" timer as per 2000 * Section 8.12. 2001 */ 2002 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 2003 old_version_timer *= PR_SLOWHZ; 2004 2005 if (version == IGMP_VERSION_1) { 2006 igi->igi_v1_timer = old_version_timer; 2007 igi->igi_v2_timer = 0; 2008 } else if (version == IGMP_VERSION_2) { 2009 igi->igi_v1_timer = 0; 2010 igi->igi_v2_timer = old_version_timer; 2011 } 2012 } 2013 2014 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2015 if (igi->igi_version != IGMP_VERSION_2) { 2016 igi->igi_version = IGMP_VERSION_2; 2017 igmp_v3_cancel_link_timers(igi); 2018 } 2019 } else if (igi->igi_v1_timer > 0) { 2020 if (igi->igi_version != IGMP_VERSION_1) { 2021 igi->igi_version = IGMP_VERSION_1; 2022 igmp_v3_cancel_link_timers(igi); 2023 } 2024 } 2025 } 2026 2027 /* 2028 * Cancel pending IGMPv3 timers for the given link and all groups 2029 * joined on it; state-change, general-query, and group-query timers. 2030 * 2031 * Only ever called on a transition from v3 to Compatibility mode. Kill 2032 * the timers stone dead (this may be expensive for large N groups), they 2033 * will be restarted if Compatibility Mode deems that they must be due to 2034 * query processing. 2035 */ 2036 static void 2037 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2038 { 2039 struct ifmultiaddr *ifma, *ifmatmp; 2040 struct ifnet *ifp; 2041 struct in_multi *inm; 2042 struct in_multi_head inm_free_tmp; 2043 2044 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2045 igi->igi_ifp, igi->igi_ifp->if_xname); 2046 2047 IN_MULTI_LIST_LOCK_ASSERT(); 2048 IGMP_LOCK_ASSERT(); 2049 NET_EPOCH_ASSERT(); 2050 2051 SLIST_INIT(&inm_free_tmp); 2052 2053 /* 2054 * Stop the v3 General Query Response on this link stone dead. 2055 * If fasttimo is woken up due to V_interface_timers_running, 2056 * the flag will be cleared if there are no pending link timers. 2057 */ 2058 igi->igi_v3_timer = 0; 2059 2060 /* 2061 * Now clear the current-state and state-change report timers 2062 * for all memberships scoped to this link. 2063 */ 2064 ifp = igi->igi_ifp; 2065 IF_ADDR_WLOCK(ifp); 2066 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, ifmatmp) { 2067 if (ifma->ifma_addr->sa_family != AF_INET || 2068 ifma->ifma_protospec == NULL) 2069 continue; 2070 inm = (struct in_multi *)ifma->ifma_protospec; 2071 switch (inm->inm_state) { 2072 case IGMP_NOT_MEMBER: 2073 case IGMP_SILENT_MEMBER: 2074 case IGMP_IDLE_MEMBER: 2075 case IGMP_LAZY_MEMBER: 2076 case IGMP_SLEEPING_MEMBER: 2077 case IGMP_AWAKENING_MEMBER: 2078 /* 2079 * These states are either not relevant in v3 mode, 2080 * or are unreported. Do nothing. 2081 */ 2082 break; 2083 case IGMP_LEAVING_MEMBER: 2084 /* 2085 * If we are leaving the group and switching to 2086 * compatibility mode, we need to release the final 2087 * reference held for issuing the INCLUDE {}, and 2088 * transition to REPORTING to ensure the host leave 2089 * message is sent upstream to the old querier -- 2090 * transition to NOT would lose the leave and race. 2091 */ 2092 inm_rele_locked(&inm_free_tmp, inm); 2093 /* FALLTHROUGH */ 2094 case IGMP_G_QUERY_PENDING_MEMBER: 2095 case IGMP_SG_QUERY_PENDING_MEMBER: 2096 inm_clear_recorded(inm); 2097 /* FALLTHROUGH */ 2098 case IGMP_REPORTING_MEMBER: 2099 inm->inm_state = IGMP_REPORTING_MEMBER; 2100 break; 2101 } 2102 /* 2103 * Always clear state-change and group report timers. 2104 * Free any pending IGMPv3 state-change records. 2105 */ 2106 inm->inm_sctimer = 0; 2107 inm->inm_timer = 0; 2108 mbufq_drain(&inm->inm_scq); 2109 } 2110 IF_ADDR_WUNLOCK(ifp); 2111 2112 inm_release_list_deferred(&inm_free_tmp); 2113 } 2114 2115 /* 2116 * Update the Older Version Querier Present timers for a link. 2117 * See Section 7.2.1 of RFC 3376. 2118 */ 2119 static void 2120 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2121 { 2122 2123 IGMP_LOCK_ASSERT(); 2124 2125 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2126 /* 2127 * IGMPv1 and IGMPv2 Querier Present timers expired. 2128 * 2129 * Revert to IGMPv3. 2130 */ 2131 if (igi->igi_version != IGMP_VERSION_3) { 2132 CTR5(KTR_IGMPV3, 2133 "%s: transition from v%d -> v%d on %p(%s)", 2134 __func__, igi->igi_version, IGMP_VERSION_3, 2135 igi->igi_ifp, igi->igi_ifp->if_xname); 2136 igi->igi_version = IGMP_VERSION_3; 2137 } 2138 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2139 /* 2140 * IGMPv1 Querier Present timer expired, 2141 * IGMPv2 Querier Present timer running. 2142 * If IGMPv2 was disabled since last timeout, 2143 * revert to IGMPv3. 2144 * If IGMPv2 is enabled, revert to IGMPv2. 2145 */ 2146 if (!V_igmp_v2enable) { 2147 CTR5(KTR_IGMPV3, 2148 "%s: transition from v%d -> v%d on %p(%s)", 2149 __func__, igi->igi_version, IGMP_VERSION_3, 2150 igi->igi_ifp, igi->igi_ifp->if_xname); 2151 igi->igi_v2_timer = 0; 2152 igi->igi_version = IGMP_VERSION_3; 2153 } else { 2154 --igi->igi_v2_timer; 2155 if (igi->igi_version != IGMP_VERSION_2) { 2156 CTR5(KTR_IGMPV3, 2157 "%s: transition from v%d -> v%d on %p(%s)", 2158 __func__, igi->igi_version, IGMP_VERSION_2, 2159 igi->igi_ifp, igi->igi_ifp->if_xname); 2160 igi->igi_version = IGMP_VERSION_2; 2161 igmp_v3_cancel_link_timers(igi); 2162 } 2163 } 2164 } else if (igi->igi_v1_timer > 0) { 2165 /* 2166 * IGMPv1 Querier Present timer running. 2167 * Stop IGMPv2 timer if running. 2168 * 2169 * If IGMPv1 was disabled since last timeout, 2170 * revert to IGMPv3. 2171 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2172 */ 2173 if (!V_igmp_v1enable) { 2174 CTR5(KTR_IGMPV3, 2175 "%s: transition from v%d -> v%d on %p(%s)", 2176 __func__, igi->igi_version, IGMP_VERSION_3, 2177 igi->igi_ifp, igi->igi_ifp->if_xname); 2178 igi->igi_v1_timer = 0; 2179 igi->igi_version = IGMP_VERSION_3; 2180 } else { 2181 --igi->igi_v1_timer; 2182 } 2183 if (igi->igi_v2_timer > 0) { 2184 CTR3(KTR_IGMPV3, 2185 "%s: cancel v2 timer on %p(%s)", 2186 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2187 igi->igi_v2_timer = 0; 2188 } 2189 } 2190 } 2191 2192 /* 2193 * Global slowtimo handler. 2194 * VIMAGE: Timeout handlers are expected to service all vimages. 2195 */ 2196 void 2197 igmp_slowtimo(void) 2198 { 2199 VNET_ITERATOR_DECL(vnet_iter); 2200 2201 VNET_LIST_RLOCK_NOSLEEP(); 2202 VNET_FOREACH(vnet_iter) { 2203 CURVNET_SET(vnet_iter); 2204 igmp_slowtimo_vnet(); 2205 CURVNET_RESTORE(); 2206 } 2207 VNET_LIST_RUNLOCK_NOSLEEP(); 2208 } 2209 2210 /* 2211 * Per-vnet slowtimo handler. 2212 */ 2213 static void 2214 igmp_slowtimo_vnet(void) 2215 { 2216 struct igmp_ifsoftc *igi; 2217 2218 IGMP_LOCK(); 2219 2220 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2221 igmp_v1v2_process_querier_timers(igi); 2222 } 2223 2224 IGMP_UNLOCK(); 2225 } 2226 2227 /* 2228 * Dispatch an IGMPv1/v2 host report or leave message. 2229 * These are always small enough to fit inside a single mbuf. 2230 */ 2231 static int 2232 igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2233 { 2234 struct epoch_tracker et; 2235 struct ifnet *ifp; 2236 struct igmp *igmp; 2237 struct ip *ip; 2238 struct mbuf *m; 2239 2240 IN_MULTI_LIST_LOCK_ASSERT(); 2241 IGMP_LOCK_ASSERT(); 2242 2243 ifp = inm->inm_ifp; 2244 2245 m = m_gethdr(M_NOWAIT, MT_DATA); 2246 if (m == NULL) 2247 return (ENOMEM); 2248 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2249 2250 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2251 2252 m->m_data += sizeof(struct ip); 2253 m->m_len = sizeof(struct igmp); 2254 2255 igmp = mtod(m, struct igmp *); 2256 igmp->igmp_type = type; 2257 igmp->igmp_code = 0; 2258 igmp->igmp_group = inm->inm_addr; 2259 igmp->igmp_cksum = 0; 2260 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2261 2262 m->m_data -= sizeof(struct ip); 2263 m->m_len += sizeof(struct ip); 2264 2265 ip = mtod(m, struct ip *); 2266 ip->ip_tos = 0; 2267 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2268 ip->ip_off = 0; 2269 ip->ip_p = IPPROTO_IGMP; 2270 ip->ip_src.s_addr = INADDR_ANY; 2271 2272 if (type == IGMP_HOST_LEAVE_MESSAGE) 2273 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2274 else 2275 ip->ip_dst = inm->inm_addr; 2276 2277 igmp_save_context(m, ifp); 2278 2279 m->m_flags |= M_IGMPV2; 2280 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2281 m->m_flags |= M_IGMP_LOOP; 2282 2283 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2284 NET_EPOCH_ENTER(et); 2285 netisr_dispatch(NETISR_IGMP, m); 2286 NET_EPOCH_EXIT(et); 2287 2288 return (0); 2289 } 2290 2291 /* 2292 * Process a state change from the upper layer for the given IPv4 group. 2293 * 2294 * Each socket holds a reference on the in_multi in its own ip_moptions. 2295 * The socket layer will have made the necessary updates to.the group 2296 * state, it is now up to IGMP to issue a state change report if there 2297 * has been any change between T0 (when the last state-change was issued) 2298 * and T1 (now). 2299 * 2300 * We use the IGMPv3 state machine at group level. The IGMP module 2301 * however makes the decision as to which IGMP protocol version to speak. 2302 * A state change *from* INCLUDE {} always means an initial join. 2303 * A state change *to* INCLUDE {} always means a final leave. 2304 * 2305 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2306 * save ourselves a bunch of work; any exclusive mode groups need not 2307 * compute source filter lists. 2308 * 2309 * VIMAGE: curvnet should have been set by caller, as this routine 2310 * is called from the socket option handlers. 2311 */ 2312 int 2313 igmp_change_state(struct in_multi *inm) 2314 { 2315 struct igmp_ifsoftc *igi; 2316 struct ifnet *ifp; 2317 int error; 2318 2319 error = 0; 2320 IN_MULTI_LOCK_ASSERT(); 2321 /* 2322 * Try to detect if the upper layer just asked us to change state 2323 * for an interface which has now gone away. 2324 */ 2325 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2326 ifp = inm->inm_ifma->ifma_ifp; 2327 /* 2328 * Sanity check that netinet's notion of ifp is the 2329 * same as net's. 2330 */ 2331 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2332 2333 IGMP_LOCK(); 2334 2335 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2336 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2337 2338 /* 2339 * If we detect a state transition to or from MCAST_UNDEFINED 2340 * for this group, then we are starting or finishing an IGMP 2341 * life cycle for this group. 2342 */ 2343 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2344 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2345 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2346 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2347 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2348 error = igmp_initial_join(inm, igi); 2349 goto out_locked; 2350 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2351 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2352 igmp_final_leave(inm, igi); 2353 goto out_locked; 2354 } 2355 } else { 2356 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2357 } 2358 2359 error = igmp_handle_state_change(inm, igi); 2360 2361 out_locked: 2362 IGMP_UNLOCK(); 2363 return (error); 2364 } 2365 2366 /* 2367 * Perform the initial join for an IGMP group. 2368 * 2369 * When joining a group: 2370 * If the group should have its IGMP traffic suppressed, do nothing. 2371 * IGMPv1 starts sending IGMPv1 host membership reports. 2372 * IGMPv2 starts sending IGMPv2 host membership reports. 2373 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2374 * initial state of the membership. 2375 */ 2376 static int 2377 igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2378 { 2379 struct ifnet *ifp; 2380 struct mbufq *mq; 2381 int error, retval, syncstates; 2382 2383 CTR4(KTR_IGMPV3, "%s: initial join 0x%08x on ifp %p(%s)", __func__, 2384 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2385 2386 error = 0; 2387 syncstates = 1; 2388 2389 ifp = inm->inm_ifp; 2390 2391 IN_MULTI_LOCK_ASSERT(); 2392 IGMP_LOCK_ASSERT(); 2393 2394 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2395 2396 /* 2397 * Groups joined on loopback or marked as 'not reported', 2398 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2399 * are never reported in any IGMP protocol exchanges. 2400 * All other groups enter the appropriate IGMP state machine 2401 * for the version in use on this link. 2402 * A link marked as IGIF_SILENT causes IGMP to be completely 2403 * disabled for the link. 2404 */ 2405 if ((ifp->if_flags & IFF_LOOPBACK) || 2406 (igi->igi_flags & IGIF_SILENT) || 2407 !igmp_isgroupreported(inm->inm_addr)) { 2408 CTR1(KTR_IGMPV3, 2409 "%s: not kicking state machine for silent group", __func__); 2410 inm->inm_state = IGMP_SILENT_MEMBER; 2411 inm->inm_timer = 0; 2412 } else { 2413 /* 2414 * Deal with overlapping in_multi lifecycle. 2415 * If this group was LEAVING, then make sure 2416 * we drop the reference we picked up to keep the 2417 * group around for the final INCLUDE {} enqueue. 2418 */ 2419 if (igi->igi_version == IGMP_VERSION_3 && 2420 inm->inm_state == IGMP_LEAVING_MEMBER) { 2421 MPASS(inm->inm_refcount > 1); 2422 inm_rele_locked(NULL, inm); 2423 } 2424 inm->inm_state = IGMP_REPORTING_MEMBER; 2425 2426 switch (igi->igi_version) { 2427 case IGMP_VERSION_1: 2428 case IGMP_VERSION_2: 2429 inm->inm_state = IGMP_IDLE_MEMBER; 2430 error = igmp_v1v2_queue_report(inm, 2431 (igi->igi_version == IGMP_VERSION_2) ? 2432 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2433 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2434 if (error == 0) { 2435 inm->inm_timer = IGMP_RANDOM_DELAY( 2436 IGMP_V1V2_MAX_RI * PR_FASTHZ); 2437 V_current_state_timers_running = 1; 2438 } 2439 break; 2440 2441 case IGMP_VERSION_3: 2442 /* 2443 * Defer update of T0 to T1, until the first copy 2444 * of the state change has been transmitted. 2445 */ 2446 syncstates = 0; 2447 2448 /* 2449 * Immediately enqueue a State-Change Report for 2450 * this interface, freeing any previous reports. 2451 * Don't kick the timers if there is nothing to do, 2452 * or if an error occurred. 2453 */ 2454 mq = &inm->inm_scq; 2455 mbufq_drain(mq); 2456 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2457 0, 0); 2458 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2459 __func__, retval); 2460 if (retval <= 0) { 2461 error = retval * -1; 2462 break; 2463 } 2464 2465 /* 2466 * Schedule transmission of pending state-change 2467 * report up to RV times for this link. The timer 2468 * will fire at the next igmp_fasttimo (~200ms), 2469 * giving us an opportunity to merge the reports. 2470 */ 2471 if (igi->igi_flags & IGIF_LOOPBACK) { 2472 inm->inm_scrv = 1; 2473 } else { 2474 KASSERT(igi->igi_rv > 1, 2475 ("%s: invalid robustness %d", __func__, 2476 igi->igi_rv)); 2477 inm->inm_scrv = igi->igi_rv; 2478 } 2479 inm->inm_sctimer = 1; 2480 V_state_change_timers_running = 1; 2481 2482 error = 0; 2483 break; 2484 } 2485 } 2486 2487 /* 2488 * Only update the T0 state if state change is atomic, 2489 * i.e. we don't need to wait for a timer to fire before we 2490 * can consider the state change to have been communicated. 2491 */ 2492 if (syncstates) { 2493 inm_commit(inm); 2494 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2495 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2496 } 2497 2498 return (error); 2499 } 2500 2501 /* 2502 * Issue an intermediate state change during the IGMP life-cycle. 2503 */ 2504 static int 2505 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2506 { 2507 struct ifnet *ifp; 2508 int retval; 2509 2510 CTR4(KTR_IGMPV3, "%s: state change for 0x%08x on ifp %p(%s)", __func__, 2511 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2512 2513 ifp = inm->inm_ifp; 2514 2515 IN_MULTI_LIST_LOCK_ASSERT(); 2516 IGMP_LOCK_ASSERT(); 2517 2518 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2519 2520 if ((ifp->if_flags & IFF_LOOPBACK) || 2521 (igi->igi_flags & IGIF_SILENT) || 2522 !igmp_isgroupreported(inm->inm_addr) || 2523 (igi->igi_version != IGMP_VERSION_3)) { 2524 if (!igmp_isgroupreported(inm->inm_addr)) { 2525 CTR1(KTR_IGMPV3, 2526 "%s: not kicking state machine for silent group", __func__); 2527 } 2528 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2529 inm_commit(inm); 2530 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2531 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2532 return (0); 2533 } 2534 2535 mbufq_drain(&inm->inm_scq); 2536 2537 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2538 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2539 if (retval <= 0) 2540 return (-retval); 2541 2542 /* 2543 * If record(s) were enqueued, start the state-change 2544 * report timer for this group. 2545 */ 2546 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2547 inm->inm_sctimer = 1; 2548 V_state_change_timers_running = 1; 2549 2550 return (0); 2551 } 2552 2553 /* 2554 * Perform the final leave for an IGMP group. 2555 * 2556 * When leaving a group: 2557 * IGMPv1 does nothing. 2558 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2559 * IGMPv3 enqueues a state-change report containing a transition 2560 * to INCLUDE {} for immediate transmission. 2561 */ 2562 static void 2563 igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2564 { 2565 int syncstates; 2566 2567 syncstates = 1; 2568 2569 CTR4(KTR_IGMPV3, "%s: final leave 0x%08x on ifp %p(%s)", 2570 __func__, ntohl(inm->inm_addr.s_addr), inm->inm_ifp, 2571 inm->inm_ifp->if_xname); 2572 2573 IN_MULTI_LIST_LOCK_ASSERT(); 2574 IGMP_LOCK_ASSERT(); 2575 2576 switch (inm->inm_state) { 2577 case IGMP_NOT_MEMBER: 2578 case IGMP_SILENT_MEMBER: 2579 case IGMP_LEAVING_MEMBER: 2580 /* Already leaving or left; do nothing. */ 2581 CTR1(KTR_IGMPV3, 2582 "%s: not kicking state machine for silent group", __func__); 2583 break; 2584 case IGMP_REPORTING_MEMBER: 2585 case IGMP_IDLE_MEMBER: 2586 case IGMP_G_QUERY_PENDING_MEMBER: 2587 case IGMP_SG_QUERY_PENDING_MEMBER: 2588 if (igi->igi_version == IGMP_VERSION_2) { 2589 #ifdef INVARIANTS 2590 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2591 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2592 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2593 __func__); 2594 #endif 2595 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2596 inm->inm_state = IGMP_NOT_MEMBER; 2597 } else if (igi->igi_version == IGMP_VERSION_3) { 2598 /* 2599 * Stop group timer and all pending reports. 2600 * Immediately enqueue a state-change report 2601 * TO_IN {} to be sent on the next fast timeout, 2602 * giving us an opportunity to merge reports. 2603 */ 2604 mbufq_drain(&inm->inm_scq); 2605 inm->inm_timer = 0; 2606 if (igi->igi_flags & IGIF_LOOPBACK) { 2607 inm->inm_scrv = 1; 2608 } else { 2609 inm->inm_scrv = igi->igi_rv; 2610 } 2611 CTR4(KTR_IGMPV3, "%s: Leaving 0x%08x/%s with %d " 2612 "pending retransmissions.", __func__, 2613 ntohl(inm->inm_addr.s_addr), 2614 inm->inm_ifp->if_xname, inm->inm_scrv); 2615 if (inm->inm_scrv == 0) { 2616 inm->inm_state = IGMP_NOT_MEMBER; 2617 inm->inm_sctimer = 0; 2618 } else { 2619 int retval __unused; 2620 2621 inm_acquire_locked(inm); 2622 2623 retval = igmp_v3_enqueue_group_record( 2624 &inm->inm_scq, inm, 1, 0, 0); 2625 KASSERT(retval != 0, 2626 ("%s: enqueue record = %d", __func__, 2627 retval)); 2628 2629 inm->inm_state = IGMP_LEAVING_MEMBER; 2630 inm->inm_sctimer = 1; 2631 V_state_change_timers_running = 1; 2632 syncstates = 0; 2633 } 2634 break; 2635 } 2636 break; 2637 case IGMP_LAZY_MEMBER: 2638 case IGMP_SLEEPING_MEMBER: 2639 case IGMP_AWAKENING_MEMBER: 2640 /* Our reports are suppressed; do nothing. */ 2641 break; 2642 } 2643 2644 if (syncstates) { 2645 inm_commit(inm); 2646 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2647 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2648 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2649 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for 0x%08x/%s", 2650 __func__, ntohl(inm->inm_addr.s_addr), 2651 inm->inm_ifp->if_xname); 2652 } 2653 } 2654 2655 /* 2656 * Enqueue an IGMPv3 group record to the given output queue. 2657 * 2658 * XXX This function could do with having the allocation code 2659 * split out, and the multiple-tree-walks coalesced into a single 2660 * routine as has been done in igmp_v3_enqueue_filter_change(). 2661 * 2662 * If is_state_change is zero, a current-state record is appended. 2663 * If is_state_change is non-zero, a state-change report is appended. 2664 * 2665 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2666 * If is_group_query is zero, and if there is a packet with free space 2667 * at the tail of the queue, it will be appended to providing there 2668 * is enough free space. 2669 * Otherwise a new mbuf packet chain is allocated. 2670 * 2671 * If is_source_query is non-zero, each source is checked to see if 2672 * it was recorded for a Group-Source query, and will be omitted if 2673 * it is not both in-mode and recorded. 2674 * 2675 * The function will attempt to allocate leading space in the packet 2676 * for the IP/IGMP header to be prepended without fragmenting the chain. 2677 * 2678 * If successful the size of all data appended to the queue is returned, 2679 * otherwise an error code less than zero is returned, or zero if 2680 * no record(s) were appended. 2681 */ 2682 static int 2683 igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2684 const int is_state_change, const int is_group_query, 2685 const int is_source_query) 2686 { 2687 struct igmp_grouprec ig; 2688 struct igmp_grouprec *pig; 2689 struct ifnet *ifp; 2690 struct ip_msource *ims, *nims; 2691 struct mbuf *m0, *m, *md; 2692 int is_filter_list_change; 2693 int minrec0len, m0srcs, msrcs, nbytes, off; 2694 int record_has_sources; 2695 int now; 2696 int type; 2697 in_addr_t naddr; 2698 uint8_t mode; 2699 2700 IN_MULTI_LIST_LOCK_ASSERT(); 2701 2702 ifp = inm->inm_ifp; 2703 is_filter_list_change = 0; 2704 m = NULL; 2705 m0 = NULL; 2706 m0srcs = 0; 2707 msrcs = 0; 2708 nbytes = 0; 2709 nims = NULL; 2710 record_has_sources = 1; 2711 pig = NULL; 2712 type = IGMP_DO_NOTHING; 2713 mode = inm->inm_st[1].iss_fmode; 2714 2715 /* 2716 * If we did not transition out of ASM mode during t0->t1, 2717 * and there are no source nodes to process, we can skip 2718 * the generation of source records. 2719 */ 2720 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2721 inm->inm_nsrc == 0) 2722 record_has_sources = 0; 2723 2724 if (is_state_change) { 2725 /* 2726 * Queue a state change record. 2727 * If the mode did not change, and there are non-ASM 2728 * listeners or source filters present, 2729 * we potentially need to issue two records for the group. 2730 * If we are transitioning to MCAST_UNDEFINED, we need 2731 * not send any sources. 2732 * If there are ASM listeners, and there was no filter 2733 * mode transition of any kind, do nothing. 2734 */ 2735 if (mode != inm->inm_st[0].iss_fmode) { 2736 if (mode == MCAST_EXCLUDE) { 2737 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2738 __func__); 2739 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2740 } else { 2741 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2742 __func__); 2743 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2744 if (mode == MCAST_UNDEFINED) 2745 record_has_sources = 0; 2746 } 2747 } else { 2748 if (record_has_sources) { 2749 is_filter_list_change = 1; 2750 } else { 2751 type = IGMP_DO_NOTHING; 2752 } 2753 } 2754 } else { 2755 /* 2756 * Queue a current state record. 2757 */ 2758 if (mode == MCAST_EXCLUDE) { 2759 type = IGMP_MODE_IS_EXCLUDE; 2760 } else if (mode == MCAST_INCLUDE) { 2761 type = IGMP_MODE_IS_INCLUDE; 2762 KASSERT(inm->inm_st[1].iss_asm == 0, 2763 ("%s: inm %p is INCLUDE but ASM count is %d", 2764 __func__, inm, inm->inm_st[1].iss_asm)); 2765 } 2766 } 2767 2768 /* 2769 * Generate the filter list changes using a separate function. 2770 */ 2771 if (is_filter_list_change) 2772 return (igmp_v3_enqueue_filter_change(mq, inm)); 2773 2774 if (type == IGMP_DO_NOTHING) { 2775 CTR3(KTR_IGMPV3, "%s: nothing to do for 0x%08x/%s", __func__, 2776 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2777 return (0); 2778 } 2779 2780 /* 2781 * If any sources are present, we must be able to fit at least 2782 * one in the trailing space of the tail packet's mbuf, 2783 * ideally more. 2784 */ 2785 minrec0len = sizeof(struct igmp_grouprec); 2786 if (record_has_sources) 2787 minrec0len += sizeof(in_addr_t); 2788 2789 CTR4(KTR_IGMPV3, "%s: queueing %s for 0x%08x/%s", __func__, 2790 igmp_rec_type_to_str(type), ntohl(inm->inm_addr.s_addr), 2791 inm->inm_ifp->if_xname); 2792 2793 /* 2794 * Check if we have a packet in the tail of the queue for this 2795 * group into which the first group record for this group will fit. 2796 * Otherwise allocate a new packet. 2797 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2798 * Note: Group records for G/GSR query responses MUST be sent 2799 * in their own packet. 2800 */ 2801 m0 = mbufq_last(mq); 2802 if (!is_group_query && 2803 m0 != NULL && 2804 (m0->m_pkthdr.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2805 (m0->m_pkthdr.len + minrec0len) < 2806 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2807 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2808 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2809 m = m0; 2810 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2811 } else { 2812 if (mbufq_full(mq)) { 2813 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2814 return (-ENOMEM); 2815 } 2816 m = NULL; 2817 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2818 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2819 if (!is_state_change && !is_group_query) { 2820 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2821 if (m) 2822 m->m_data += IGMP_LEADINGSPACE; 2823 } 2824 if (m == NULL) { 2825 m = m_gethdr(M_NOWAIT, MT_DATA); 2826 if (m) 2827 M_ALIGN(m, IGMP_LEADINGSPACE); 2828 } 2829 if (m == NULL) 2830 return (-ENOMEM); 2831 2832 igmp_save_context(m, ifp); 2833 2834 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2835 } 2836 2837 /* 2838 * Append group record. 2839 * If we have sources, we don't know how many yet. 2840 */ 2841 ig.ig_type = type; 2842 ig.ig_datalen = 0; 2843 ig.ig_numsrc = 0; 2844 ig.ig_group = inm->inm_addr; 2845 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2846 if (m != m0) 2847 m_freem(m); 2848 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2849 return (-ENOMEM); 2850 } 2851 nbytes += sizeof(struct igmp_grouprec); 2852 2853 /* 2854 * Append as many sources as will fit in the first packet. 2855 * If we are appending to a new packet, the chain allocation 2856 * may potentially use clusters; use m_getptr() in this case. 2857 * If we are appending to an existing packet, we need to obtain 2858 * a pointer to the group record after m_append(), in case a new 2859 * mbuf was allocated. 2860 * Only append sources which are in-mode at t1. If we are 2861 * transitioning to MCAST_UNDEFINED state on the group, do not 2862 * include source entries. 2863 * Only report recorded sources in our filter set when responding 2864 * to a group-source query. 2865 */ 2866 if (record_has_sources) { 2867 if (m == m0) { 2868 md = m_last(m); 2869 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2870 md->m_len - nbytes); 2871 } else { 2872 md = m_getptr(m, 0, &off); 2873 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2874 off); 2875 } 2876 msrcs = 0; 2877 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2878 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2879 ims->ims_haddr); 2880 now = ims_get_mode(inm, ims, 1); 2881 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2882 if ((now != mode) || 2883 (now == mode && mode == MCAST_UNDEFINED)) { 2884 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2885 continue; 2886 } 2887 if (is_source_query && ims->ims_stp == 0) { 2888 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2889 __func__); 2890 continue; 2891 } 2892 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2893 naddr = htonl(ims->ims_haddr); 2894 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2895 if (m != m0) 2896 m_freem(m); 2897 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2898 __func__); 2899 return (-ENOMEM); 2900 } 2901 nbytes += sizeof(in_addr_t); 2902 ++msrcs; 2903 if (msrcs == m0srcs) 2904 break; 2905 } 2906 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2907 msrcs); 2908 pig->ig_numsrc = htons(msrcs); 2909 nbytes += (msrcs * sizeof(in_addr_t)); 2910 } 2911 2912 if (is_source_query && msrcs == 0) { 2913 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2914 if (m != m0) 2915 m_freem(m); 2916 return (0); 2917 } 2918 2919 /* 2920 * We are good to go with first packet. 2921 */ 2922 if (m != m0) { 2923 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2924 m->m_pkthdr.vt_nrecs = 1; 2925 mbufq_enqueue(mq, m); 2926 } else 2927 m->m_pkthdr.vt_nrecs++; 2928 2929 /* 2930 * No further work needed if no source list in packet(s). 2931 */ 2932 if (!record_has_sources) 2933 return (nbytes); 2934 2935 /* 2936 * Whilst sources remain to be announced, we need to allocate 2937 * a new packet and fill out as many sources as will fit. 2938 * Always try for a cluster first. 2939 */ 2940 while (nims != NULL) { 2941 if (mbufq_full(mq)) { 2942 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2943 return (-ENOMEM); 2944 } 2945 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2946 if (m) 2947 m->m_data += IGMP_LEADINGSPACE; 2948 if (m == NULL) { 2949 m = m_gethdr(M_NOWAIT, MT_DATA); 2950 if (m) 2951 M_ALIGN(m, IGMP_LEADINGSPACE); 2952 } 2953 if (m == NULL) 2954 return (-ENOMEM); 2955 igmp_save_context(m, ifp); 2956 md = m_getptr(m, 0, &off); 2957 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2958 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2959 2960 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2961 if (m != m0) 2962 m_freem(m); 2963 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2964 return (-ENOMEM); 2965 } 2966 m->m_pkthdr.vt_nrecs = 1; 2967 nbytes += sizeof(struct igmp_grouprec); 2968 2969 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2970 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2971 2972 msrcs = 0; 2973 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2974 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2975 ims->ims_haddr); 2976 now = ims_get_mode(inm, ims, 1); 2977 if ((now != mode) || 2978 (now == mode && mode == MCAST_UNDEFINED)) { 2979 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2980 continue; 2981 } 2982 if (is_source_query && ims->ims_stp == 0) { 2983 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2984 __func__); 2985 continue; 2986 } 2987 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2988 naddr = htonl(ims->ims_haddr); 2989 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2990 if (m != m0) 2991 m_freem(m); 2992 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2993 __func__); 2994 return (-ENOMEM); 2995 } 2996 ++msrcs; 2997 if (msrcs == m0srcs) 2998 break; 2999 } 3000 pig->ig_numsrc = htons(msrcs); 3001 nbytes += (msrcs * sizeof(in_addr_t)); 3002 3003 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 3004 mbufq_enqueue(mq, m); 3005 } 3006 3007 return (nbytes); 3008 } 3009 3010 /* 3011 * Type used to mark record pass completion. 3012 * We exploit the fact we can cast to this easily from the 3013 * current filter modes on each ip_msource node. 3014 */ 3015 typedef enum { 3016 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 3017 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 3018 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 3019 REC_FULL = REC_ALLOW | REC_BLOCK 3020 } rectype_t; 3021 3022 /* 3023 * Enqueue an IGMPv3 filter list change to the given output queue. 3024 * 3025 * Source list filter state is held in an RB-tree. When the filter list 3026 * for a group is changed without changing its mode, we need to compute 3027 * the deltas between T0 and T1 for each source in the filter set, 3028 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 3029 * 3030 * As we may potentially queue two record types, and the entire R-B tree 3031 * needs to be walked at once, we break this out into its own function 3032 * so we can generate a tightly packed queue of packets. 3033 * 3034 * XXX This could be written to only use one tree walk, although that makes 3035 * serializing into the mbuf chains a bit harder. For now we do two walks 3036 * which makes things easier on us, and it may or may not be harder on 3037 * the L2 cache. 3038 * 3039 * If successful the size of all data appended to the queue is returned, 3040 * otherwise an error code less than zero is returned, or zero if 3041 * no record(s) were appended. 3042 */ 3043 static int 3044 igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3045 { 3046 static const int MINRECLEN = 3047 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3048 struct ifnet *ifp; 3049 struct igmp_grouprec ig; 3050 struct igmp_grouprec *pig; 3051 struct ip_msource *ims, *nims; 3052 struct mbuf *m, *m0, *md; 3053 in_addr_t naddr; 3054 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3055 #ifdef KTR 3056 int nallow, nblock; 3057 #endif 3058 uint8_t mode, now, then; 3059 rectype_t crt, drt, nrt; 3060 3061 IN_MULTI_LIST_LOCK_ASSERT(); 3062 3063 if (inm->inm_nsrc == 0 || 3064 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3065 return (0); 3066 3067 ifp = inm->inm_ifp; /* interface */ 3068 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3069 crt = REC_NONE; /* current group record type */ 3070 drt = REC_NONE; /* mask of completed group record types */ 3071 nrt = REC_NONE; /* record type for current node */ 3072 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3073 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3074 npbytes = 0; /* # of bytes appended this packet */ 3075 rsrcs = 0; /* # sources encoded in current record */ 3076 schanged = 0; /* # nodes encoded in overall filter change */ 3077 #ifdef KTR 3078 nallow = 0; /* # of source entries in ALLOW_NEW */ 3079 nblock = 0; /* # of source entries in BLOCK_OLD */ 3080 #endif 3081 nims = NULL; /* next tree node pointer */ 3082 3083 /* 3084 * For each possible filter record mode. 3085 * The first kind of source we encounter tells us which 3086 * is the first kind of record we start appending. 3087 * If a node transitioned to UNDEFINED at t1, its mode is treated 3088 * as the inverse of the group's filter mode. 3089 */ 3090 while (drt != REC_FULL) { 3091 do { 3092 m0 = mbufq_last(mq); 3093 if (m0 != NULL && 3094 (m0->m_pkthdr.vt_nrecs + 1 <= 3095 IGMP_V3_REPORT_MAXRECS) && 3096 (m0->m_pkthdr.len + MINRECLEN) < 3097 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3098 m = m0; 3099 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3100 sizeof(struct igmp_grouprec)) / 3101 sizeof(in_addr_t); 3102 CTR1(KTR_IGMPV3, 3103 "%s: use previous packet", __func__); 3104 } else { 3105 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3106 if (m) 3107 m->m_data += IGMP_LEADINGSPACE; 3108 if (m == NULL) { 3109 m = m_gethdr(M_NOWAIT, MT_DATA); 3110 if (m) 3111 M_ALIGN(m, IGMP_LEADINGSPACE); 3112 } 3113 if (m == NULL) { 3114 CTR1(KTR_IGMPV3, 3115 "%s: m_get*() failed", __func__); 3116 return (-ENOMEM); 3117 } 3118 m->m_pkthdr.vt_nrecs = 0; 3119 igmp_save_context(m, ifp); 3120 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3121 sizeof(struct igmp_grouprec)) / 3122 sizeof(in_addr_t); 3123 npbytes = 0; 3124 CTR1(KTR_IGMPV3, 3125 "%s: allocated new packet", __func__); 3126 } 3127 /* 3128 * Append the IGMP group record header to the 3129 * current packet's data area. 3130 * Recalculate pointer to free space for next 3131 * group record, in case m_append() allocated 3132 * a new mbuf or cluster. 3133 */ 3134 memset(&ig, 0, sizeof(ig)); 3135 ig.ig_group = inm->inm_addr; 3136 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3137 if (m != m0) 3138 m_freem(m); 3139 CTR1(KTR_IGMPV3, 3140 "%s: m_append() failed", __func__); 3141 return (-ENOMEM); 3142 } 3143 npbytes += sizeof(struct igmp_grouprec); 3144 if (m != m0) { 3145 /* new packet; offset in c hain */ 3146 md = m_getptr(m, npbytes - 3147 sizeof(struct igmp_grouprec), &off); 3148 pig = (struct igmp_grouprec *)(mtod(md, 3149 uint8_t *) + off); 3150 } else { 3151 /* current packet; offset from last append */ 3152 md = m_last(m); 3153 pig = (struct igmp_grouprec *)(mtod(md, 3154 uint8_t *) + md->m_len - 3155 sizeof(struct igmp_grouprec)); 3156 } 3157 /* 3158 * Begin walking the tree for this record type 3159 * pass, or continue from where we left off 3160 * previously if we had to allocate a new packet. 3161 * Only report deltas in-mode at t1. 3162 * We need not report included sources as allowed 3163 * if we are in inclusive mode on the group, 3164 * however the converse is not true. 3165 */ 3166 rsrcs = 0; 3167 if (nims == NULL) 3168 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3169 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3170 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", 3171 __func__, ims->ims_haddr); 3172 now = ims_get_mode(inm, ims, 1); 3173 then = ims_get_mode(inm, ims, 0); 3174 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3175 __func__, then, now); 3176 if (now == then) { 3177 CTR1(KTR_IGMPV3, 3178 "%s: skip unchanged", __func__); 3179 continue; 3180 } 3181 if (mode == MCAST_EXCLUDE && 3182 now == MCAST_INCLUDE) { 3183 CTR1(KTR_IGMPV3, 3184 "%s: skip IN src on EX group", 3185 __func__); 3186 continue; 3187 } 3188 nrt = (rectype_t)now; 3189 if (nrt == REC_NONE) 3190 nrt = (rectype_t)(~mode & REC_FULL); 3191 if (schanged++ == 0) { 3192 crt = nrt; 3193 } else if (crt != nrt) 3194 continue; 3195 naddr = htonl(ims->ims_haddr); 3196 if (!m_append(m, sizeof(in_addr_t), 3197 (void *)&naddr)) { 3198 if (m != m0) 3199 m_freem(m); 3200 CTR1(KTR_IGMPV3, 3201 "%s: m_append() failed", __func__); 3202 return (-ENOMEM); 3203 } 3204 #ifdef KTR 3205 nallow += !!(crt == REC_ALLOW); 3206 nblock += !!(crt == REC_BLOCK); 3207 #endif 3208 if (++rsrcs == m0srcs) 3209 break; 3210 } 3211 /* 3212 * If we did not append any tree nodes on this 3213 * pass, back out of allocations. 3214 */ 3215 if (rsrcs == 0) { 3216 npbytes -= sizeof(struct igmp_grouprec); 3217 if (m != m0) { 3218 CTR1(KTR_IGMPV3, 3219 "%s: m_free(m)", __func__); 3220 m_freem(m); 3221 } else { 3222 CTR1(KTR_IGMPV3, 3223 "%s: m_adj(m, -ig)", __func__); 3224 m_adj(m, -((int)sizeof( 3225 struct igmp_grouprec))); 3226 } 3227 continue; 3228 } 3229 npbytes += (rsrcs * sizeof(in_addr_t)); 3230 if (crt == REC_ALLOW) 3231 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3232 else if (crt == REC_BLOCK) 3233 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3234 pig->ig_numsrc = htons(rsrcs); 3235 /* 3236 * Count the new group record, and enqueue this 3237 * packet if it wasn't already queued. 3238 */ 3239 m->m_pkthdr.vt_nrecs++; 3240 if (m != m0) 3241 mbufq_enqueue(mq, m); 3242 nbytes += npbytes; 3243 } while (nims != NULL); 3244 drt |= crt; 3245 crt = (~crt & REC_FULL); 3246 } 3247 3248 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3249 nallow, nblock); 3250 3251 return (nbytes); 3252 } 3253 3254 static int 3255 igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3256 { 3257 struct mbufq *gq; 3258 struct mbuf *m; /* pending state-change */ 3259 struct mbuf *m0; /* copy of pending state-change */ 3260 struct mbuf *mt; /* last state-change in packet */ 3261 int docopy, domerge; 3262 u_int recslen; 3263 3264 docopy = 0; 3265 domerge = 0; 3266 recslen = 0; 3267 3268 IN_MULTI_LIST_LOCK_ASSERT(); 3269 IGMP_LOCK_ASSERT(); 3270 3271 /* 3272 * If there are further pending retransmissions, make a writable 3273 * copy of each queued state-change message before merging. 3274 */ 3275 if (inm->inm_scrv > 0) 3276 docopy = 1; 3277 3278 gq = &inm->inm_scq; 3279 #ifdef KTR 3280 if (mbufq_first(gq) == NULL) { 3281 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3282 __func__, inm); 3283 } 3284 #endif 3285 3286 m = mbufq_first(gq); 3287 while (m != NULL) { 3288 /* 3289 * Only merge the report into the current packet if 3290 * there is sufficient space to do so; an IGMPv3 report 3291 * packet may only contain 65,535 group records. 3292 * Always use a simple mbuf chain concatentation to do this, 3293 * as large state changes for single groups may have 3294 * allocated clusters. 3295 */ 3296 domerge = 0; 3297 mt = mbufq_last(scq); 3298 if (mt != NULL) { 3299 recslen = m_length(m, NULL); 3300 3301 if ((mt->m_pkthdr.vt_nrecs + 3302 m->m_pkthdr.vt_nrecs <= 3303 IGMP_V3_REPORT_MAXRECS) && 3304 (mt->m_pkthdr.len + recslen <= 3305 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3306 domerge = 1; 3307 } 3308 3309 if (!domerge && mbufq_full(gq)) { 3310 CTR2(KTR_IGMPV3, 3311 "%s: outbound queue full, skipping whole packet %p", 3312 __func__, m); 3313 mt = m->m_nextpkt; 3314 if (!docopy) 3315 m_freem(m); 3316 m = mt; 3317 continue; 3318 } 3319 3320 if (!docopy) { 3321 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3322 m0 = mbufq_dequeue(gq); 3323 m = m0->m_nextpkt; 3324 } else { 3325 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3326 m0 = m_dup(m, M_NOWAIT); 3327 if (m0 == NULL) 3328 return (ENOMEM); 3329 m0->m_nextpkt = NULL; 3330 m = m->m_nextpkt; 3331 } 3332 3333 if (!domerge) { 3334 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3335 __func__, m0, scq); 3336 mbufq_enqueue(scq, m0); 3337 } else { 3338 struct mbuf *mtl; /* last mbuf of packet mt */ 3339 3340 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3341 __func__, m0, mt); 3342 3343 mtl = m_last(mt); 3344 m0->m_flags &= ~M_PKTHDR; 3345 mt->m_pkthdr.len += recslen; 3346 mt->m_pkthdr.vt_nrecs += 3347 m0->m_pkthdr.vt_nrecs; 3348 3349 mtl->m_next = m0; 3350 } 3351 } 3352 3353 return (0); 3354 } 3355 3356 /* 3357 * Respond to a pending IGMPv3 General Query. 3358 */ 3359 static void 3360 igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3361 { 3362 struct ifmultiaddr *ifma; 3363 struct ifnet *ifp; 3364 struct in_multi *inm; 3365 int retval __unused, loop; 3366 3367 IN_MULTI_LIST_LOCK_ASSERT(); 3368 IGMP_LOCK_ASSERT(); 3369 NET_EPOCH_ASSERT(); 3370 3371 KASSERT(igi->igi_version == IGMP_VERSION_3, 3372 ("%s: called when version %d", __func__, igi->igi_version)); 3373 3374 /* 3375 * Check that there are some packets queued. If so, send them first. 3376 * For large number of groups the reply to general query can take 3377 * many packets, we should finish sending them before starting of 3378 * queuing the new reply. 3379 */ 3380 if (mbufq_len(&igi->igi_gq) != 0) 3381 goto send; 3382 3383 ifp = igi->igi_ifp; 3384 3385 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3386 if (ifma->ifma_addr->sa_family != AF_INET || 3387 ifma->ifma_protospec == NULL) 3388 continue; 3389 3390 inm = (struct in_multi *)ifma->ifma_protospec; 3391 KASSERT(ifp == inm->inm_ifp, 3392 ("%s: inconsistent ifp", __func__)); 3393 3394 switch (inm->inm_state) { 3395 case IGMP_NOT_MEMBER: 3396 case IGMP_SILENT_MEMBER: 3397 break; 3398 case IGMP_REPORTING_MEMBER: 3399 case IGMP_IDLE_MEMBER: 3400 case IGMP_LAZY_MEMBER: 3401 case IGMP_SLEEPING_MEMBER: 3402 case IGMP_AWAKENING_MEMBER: 3403 inm->inm_state = IGMP_REPORTING_MEMBER; 3404 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3405 inm, 0, 0, 0); 3406 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3407 __func__, retval); 3408 break; 3409 case IGMP_G_QUERY_PENDING_MEMBER: 3410 case IGMP_SG_QUERY_PENDING_MEMBER: 3411 case IGMP_LEAVING_MEMBER: 3412 break; 3413 } 3414 } 3415 3416 send: 3417 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3418 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3419 3420 /* 3421 * Slew transmission of bursts over 500ms intervals. 3422 */ 3423 if (mbufq_first(&igi->igi_gq) != NULL) { 3424 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3425 IGMP_RESPONSE_BURST_INTERVAL); 3426 V_interface_timers_running = 1; 3427 } 3428 } 3429 3430 /* 3431 * Transmit the next pending IGMP message in the output queue. 3432 * 3433 * We get called from netisr_processqueue(). A mutex private to igmpoq 3434 * will be acquired and released around this routine. 3435 * 3436 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3437 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3438 * a link and uses a link-scope multicast address. 3439 */ 3440 static void 3441 igmp_intr(struct mbuf *m) 3442 { 3443 struct ip_moptions imo; 3444 struct ifnet *ifp; 3445 struct mbuf *ipopts, *m0; 3446 int error; 3447 uint32_t ifindex; 3448 3449 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3450 3451 /* 3452 * Set VNET image pointer from enqueued mbuf chain 3453 * before doing anything else. Whilst we use interface 3454 * indexes to guard against interface detach, they are 3455 * unique to each VIMAGE and must be retrieved. 3456 */ 3457 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3458 ifindex = igmp_restore_context(m); 3459 3460 /* 3461 * Check if the ifnet still exists. This limits the scope of 3462 * any race in the absence of a global ifp lock for low cost 3463 * (an array lookup). 3464 */ 3465 ifp = ifnet_byindex(ifindex); 3466 if (ifp == NULL) { 3467 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3468 __func__, m, ifindex); 3469 m_freem(m); 3470 IPSTAT_INC(ips_noroute); 3471 goto out; 3472 } 3473 3474 ipopts = V_igmp_sendra ? m_raopt : NULL; 3475 3476 imo.imo_multicast_ttl = 1; 3477 imo.imo_multicast_vif = -1; 3478 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3479 3480 /* 3481 * If the user requested that IGMP traffic be explicitly 3482 * redirected to the loopback interface (e.g. they are running a 3483 * MANET interface and the routing protocol needs to see the 3484 * updates), handle this now. 3485 */ 3486 if (m->m_flags & M_IGMP_LOOP) 3487 imo.imo_multicast_ifp = V_loif; 3488 else 3489 imo.imo_multicast_ifp = ifp; 3490 3491 if (m->m_flags & M_IGMPV2) { 3492 m0 = m; 3493 } else { 3494 m0 = igmp_v3_encap_report(ifp, m); 3495 if (m0 == NULL) { 3496 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3497 m_freem(m); 3498 IPSTAT_INC(ips_odropped); 3499 goto out; 3500 } 3501 } 3502 3503 igmp_scrub_context(m0); 3504 m_clrprotoflags(m); 3505 m0->m_pkthdr.rcvif = V_loif; 3506 #ifdef MAC 3507 mac_netinet_igmp_send(ifp, m0); 3508 #endif 3509 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3510 if (error) { 3511 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3512 goto out; 3513 } 3514 3515 IGMPSTAT_INC(igps_snd_reports); 3516 3517 out: 3518 /* 3519 * We must restore the existing vnet pointer before 3520 * continuing as we are run from netisr context. 3521 */ 3522 CURVNET_RESTORE(); 3523 } 3524 3525 /* 3526 * Encapsulate an IGMPv3 report. 3527 * 3528 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3529 * chain has already had its IP/IGMPv3 header prepended. In this case 3530 * the function will not attempt to prepend; the lengths and checksums 3531 * will however be re-computed. 3532 * 3533 * Returns a pointer to the new mbuf chain head, or NULL if the 3534 * allocation failed. 3535 */ 3536 static struct mbuf * 3537 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3538 { 3539 struct igmp_report *igmp; 3540 struct ip *ip; 3541 int hdrlen, igmpreclen; 3542 3543 KASSERT((m->m_flags & M_PKTHDR), 3544 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3545 3546 igmpreclen = m_length(m, NULL); 3547 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); 3548 3549 if (m->m_flags & M_IGMPV3_HDR) { 3550 igmpreclen -= hdrlen; 3551 } else { 3552 M_PREPEND(m, hdrlen, M_NOWAIT); 3553 if (m == NULL) 3554 return (NULL); 3555 m->m_flags |= M_IGMPV3_HDR; 3556 } 3557 3558 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen); 3559 3560 m->m_data += sizeof(struct ip); 3561 m->m_len -= sizeof(struct ip); 3562 3563 igmp = mtod(m, struct igmp_report *); 3564 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; 3565 igmp->ir_rsv1 = 0; 3566 igmp->ir_rsv2 = 0; 3567 igmp->ir_numgrps = htons(m->m_pkthdr.vt_nrecs); 3568 igmp->ir_cksum = 0; 3569 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3570 m->m_pkthdr.vt_nrecs = 0; 3571 3572 m->m_data -= sizeof(struct ip); 3573 m->m_len += sizeof(struct ip); 3574 3575 ip = mtod(m, struct ip *); 3576 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; 3577 ip->ip_len = htons(hdrlen + igmpreclen); 3578 ip->ip_off = htons(IP_DF); 3579 ip->ip_p = IPPROTO_IGMP; 3580 ip->ip_sum = 0; 3581 3582 ip->ip_src.s_addr = INADDR_ANY; 3583 3584 if (m->m_flags & M_IGMP_LOOP) { 3585 struct in_ifaddr *ia; 3586 3587 IFP_TO_IA(ifp, ia); 3588 if (ia != NULL) 3589 ip->ip_src = ia->ia_addr.sin_addr; 3590 } 3591 3592 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); 3593 3594 return (m); 3595 } 3596 3597 #ifdef KTR 3598 static char * 3599 igmp_rec_type_to_str(const int type) 3600 { 3601 3602 switch (type) { 3603 case IGMP_CHANGE_TO_EXCLUDE_MODE: 3604 return "TO_EX"; 3605 break; 3606 case IGMP_CHANGE_TO_INCLUDE_MODE: 3607 return "TO_IN"; 3608 break; 3609 case IGMP_MODE_IS_EXCLUDE: 3610 return "MODE_EX"; 3611 break; 3612 case IGMP_MODE_IS_INCLUDE: 3613 return "MODE_IN"; 3614 break; 3615 case IGMP_ALLOW_NEW_SOURCES: 3616 return "ALLOW_NEW"; 3617 break; 3618 case IGMP_BLOCK_OLD_SOURCES: 3619 return "BLOCK_OLD"; 3620 break; 3621 default: 3622 break; 3623 } 3624 return "unknown"; 3625 } 3626 #endif 3627 3628 #ifdef VIMAGE 3629 static void 3630 vnet_igmp_init(const void *unused __unused) 3631 { 3632 3633 netisr_register_vnet(&igmp_nh); 3634 } 3635 VNET_SYSINIT(vnet_igmp_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3636 vnet_igmp_init, NULL); 3637 3638 static void 3639 vnet_igmp_uninit(const void *unused __unused) 3640 { 3641 3642 /* This can happen when we shutdown the entire network stack. */ 3643 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3644 3645 netisr_unregister_vnet(&igmp_nh); 3646 } 3647 VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3648 vnet_igmp_uninit, NULL); 3649 #endif 3650 3651 #ifdef DDB 3652 DB_SHOW_COMMAND(igi_list, db_show_igi_list) 3653 { 3654 struct igmp_ifsoftc *igi, *tigi; 3655 LIST_HEAD(_igi_list, igmp_ifsoftc) *igi_head; 3656 3657 if (!have_addr) { 3658 db_printf("usage: show igi_list <addr>\n"); 3659 return; 3660 } 3661 igi_head = (struct _igi_list *)addr; 3662 3663 LIST_FOREACH_SAFE(igi, igi_head, igi_link, tigi) { 3664 db_printf("igmp_ifsoftc %p:\n", igi); 3665 db_printf(" ifp %p\n", igi->igi_ifp); 3666 db_printf(" version %u\n", igi->igi_version); 3667 db_printf(" v1_timer %u\n", igi->igi_v1_timer); 3668 db_printf(" v2_timer %u\n", igi->igi_v2_timer); 3669 db_printf(" v3_timer %u\n", igi->igi_v3_timer); 3670 db_printf(" flags %#x\n", igi->igi_flags); 3671 db_printf(" rv %u\n", igi->igi_rv); 3672 db_printf(" qi %u\n", igi->igi_qi); 3673 db_printf(" qri %u\n", igi->igi_qri); 3674 db_printf(" uri %u\n", igi->igi_uri); 3675 /* struct mbufq igi_gq; */ 3676 db_printf("\n"); 3677 } 3678 } 3679 #endif 3680 3681 static int 3682 igmp_modevent(module_t mod, int type, void *unused __unused) 3683 { 3684 3685 switch (type) { 3686 case MOD_LOAD: 3687 CTR1(KTR_IGMPV3, "%s: initializing", __func__); 3688 IGMP_LOCK_INIT(); 3689 m_raopt = igmp_ra_alloc(); 3690 netisr_register(&igmp_nh); 3691 break; 3692 case MOD_UNLOAD: 3693 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3694 netisr_unregister(&igmp_nh); 3695 m_free(m_raopt); 3696 m_raopt = NULL; 3697 IGMP_LOCK_DESTROY(); 3698 break; 3699 default: 3700 return (EOPNOTSUPP); 3701 } 3702 return (0); 3703 } 3704 3705 static moduledata_t igmp_mod = { 3706 "igmp", 3707 igmp_modevent, 3708 0 3709 }; 3710 DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE); 3711