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/rmlock.h> 67 #include <sys/sysctl.h> 68 #include <sys/ktr.h> 69 #include <sys/condvar.h> 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #endif 74 75 #include <net/if.h> 76 #include <net/if_var.h> 77 #include <net/netisr.h> 78 #include <net/vnet.h> 79 80 #include <netinet/in.h> 81 #include <netinet/in_var.h> 82 #include <netinet/in_systm.h> 83 #include <netinet/ip.h> 84 #include <netinet/ip_var.h> 85 #include <netinet/ip_options.h> 86 #include <netinet/igmp.h> 87 #include <netinet/igmp_var.h> 88 89 #include <machine/in_cksum.h> 90 91 #include <security/mac/mac_framework.h> 92 93 #ifndef KTR_IGMPV3 94 #define KTR_IGMPV3 KTR_INET 95 #endif 96 97 static struct igmp_ifsoftc * 98 igi_alloc_locked(struct ifnet *); 99 static void igi_delete_locked(const struct ifnet *); 100 static void igmp_dispatch_queue(struct mbufq *, int, const int); 101 static void igmp_fasttimo_vnet(void); 102 static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 103 static int igmp_handle_state_change(struct in_multi *, 104 struct igmp_ifsoftc *); 105 static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 106 static int igmp_input_v1_query(struct ifnet *, const struct ip *, 107 const struct igmp *); 108 static int igmp_input_v2_query(struct ifnet *, const struct ip *, 109 const struct igmp *); 110 static int igmp_input_v3_query(struct ifnet *, const struct ip *, 111 /*const*/ struct igmpv3 *); 112 static int igmp_input_v3_group_query(struct in_multi *, 113 struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 114 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 115 /*const*/ struct igmp *); 116 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 117 /*const*/ struct igmp *); 118 static void igmp_intr(struct mbuf *); 119 static int igmp_isgroupreported(const struct in_addr); 120 static struct mbuf * 121 igmp_ra_alloc(void); 122 #ifdef KTR 123 static char * igmp_rec_type_to_str(const int); 124 #endif 125 static void igmp_set_version(struct igmp_ifsoftc *, const int); 126 static void igmp_slowtimo_vnet(void); 127 static int igmp_v1v2_queue_report(struct in_multi *, const int); 128 static void igmp_v1v2_process_group_timer(struct in_multi *, const int); 129 static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 130 static void igmp_v2_update_group(struct in_multi *, const int); 131 static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 132 static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 133 static struct mbuf * 134 igmp_v3_encap_report(struct ifnet *, struct mbuf *); 135 static int igmp_v3_enqueue_group_record(struct mbufq *, 136 struct in_multi *, const int, const int, const int); 137 static int igmp_v3_enqueue_filter_change(struct mbufq *, 138 struct in_multi *); 139 static void igmp_v3_process_group_timers(struct in_multi_head *, 140 struct mbufq *, struct mbufq *, struct in_multi *, 141 const int); 142 static int igmp_v3_merge_state_changes(struct in_multi *, 143 struct mbufq *); 144 static void igmp_v3_suppress_group_record(struct in_multi *); 145 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 146 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 147 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 148 static int sysctl_igmp_stat(SYSCTL_HANDLER_ARGS); 149 150 static const struct netisr_handler igmp_nh = { 151 .nh_name = "igmp", 152 .nh_handler = igmp_intr, 153 .nh_proto = NETISR_IGMP, 154 .nh_policy = NETISR_POLICY_SOURCE, 155 }; 156 157 /* 158 * System-wide globals. 159 * 160 * Unlocked access to these is OK, except for the global IGMP output 161 * queue. The IGMP subsystem lock ends up being system-wide for the moment, 162 * because all VIMAGEs have to share a global output queue, as netisrs 163 * themselves are not virtualized. 164 * 165 * Locking: 166 * * The permitted lock order is: IN_MULTI_LIST_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 167 * Any may be taken independently; if any are held at the same 168 * time, the above lock order must be followed. 169 * * All output is delegated to the netisr. 170 * Now that Giant has been eliminated, the netisr may be inlined. 171 * * IN_MULTI_LIST_LOCK covers in_multi. 172 * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 173 * including the output queue. 174 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 175 * per-link state iterators. 176 * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 177 * therefore it is not refcounted. 178 * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 179 * 180 * Reference counting 181 * * IGMP acquires its own reference every time an in_multi is passed to 182 * it and the group is being joined for the first time. 183 * * IGMP releases its reference(s) on in_multi in a deferred way, 184 * because the operations which process the release run as part of 185 * a loop whose control variables are directly affected by the release 186 * (that, and not recursing on the IF_ADDR_LOCK). 187 * 188 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 189 * to a vnet in ifp->if_vnet. 190 * 191 * SMPng: XXX We may potentially race operations on ifma_protospec. 192 * The problem is that we currently lack a clean way of taking the 193 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 194 * as anything which modifies ifma needs to be covered by that lock. 195 * So check for ifma_protospec being NULL before proceeding. 196 */ 197 struct mtx igmp_mtx; 198 199 struct mbuf *m_raopt; /* Router Alert option */ 200 static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 201 202 /* 203 * VIMAGE-wide globals. 204 * 205 * The IGMPv3 timers themselves need to run per-image, however, 206 * protosw timers run globally (see tcp). 207 * An ifnet can only be in one vimage at a time, and the loopback 208 * ifnet, loif, is itself virtualized. 209 * It would otherwise be possible to seriously hose IGMP state, 210 * and create inconsistencies in upstream multicast routing, if you have 211 * multiple VIMAGEs running on the same link joining different multicast 212 * groups, UNLESS the "primary IP address" is different. This is because 213 * IGMP for IPv4 does not force link-local addresses to be used for each 214 * node, unlike MLD for IPv6. 215 * Obviously the IGMPv3 per-interface state has per-vimage granularity 216 * also as a result. 217 * 218 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 219 * policy to control the address used by IGMP on the link. 220 */ 221 VNET_DEFINE_STATIC(int, interface_timers_running); /* IGMPv3 general 222 * query response */ 223 VNET_DEFINE_STATIC(int, state_change_timers_running); /* IGMPv3 state-change 224 * retransmit */ 225 VNET_DEFINE_STATIC(int, current_state_timers_running); /* IGMPv1/v2 host 226 * report; IGMPv3 g/sg 227 * query response */ 228 229 #define V_interface_timers_running VNET(interface_timers_running) 230 #define V_state_change_timers_running VNET(state_change_timers_running) 231 #define V_current_state_timers_running VNET(current_state_timers_running) 232 233 VNET_PCPUSTAT_DEFINE(struct igmpstat, igmpstat); 234 VNET_PCPUSTAT_SYSINIT(igmpstat); 235 VNET_PCPUSTAT_SYSUNINIT(igmpstat); 236 237 VNET_DEFINE_STATIC(LIST_HEAD(, igmp_ifsoftc), igi_head) = 238 LIST_HEAD_INITIALIZER(igi_head); 239 VNET_DEFINE_STATIC(struct timeval, igmp_gsrdelay) = {10, 0}; 240 241 #define V_igi_head VNET(igi_head) 242 #define V_igmp_gsrdelay VNET(igmp_gsrdelay) 243 244 VNET_DEFINE_STATIC(int, igmp_recvifkludge) = 1; 245 VNET_DEFINE_STATIC(int, igmp_sendra) = 1; 246 VNET_DEFINE_STATIC(int, igmp_sendlocal) = 1; 247 VNET_DEFINE_STATIC(int, igmp_v1enable) = 1; 248 VNET_DEFINE_STATIC(int, igmp_v2enable) = 1; 249 VNET_DEFINE_STATIC(int, igmp_legacysupp); 250 VNET_DEFINE_STATIC(int, igmp_default_version) = IGMP_VERSION_3; 251 252 #define V_igmp_recvifkludge VNET(igmp_recvifkludge) 253 #define V_igmp_sendra VNET(igmp_sendra) 254 #define V_igmp_sendlocal VNET(igmp_sendlocal) 255 #define V_igmp_v1enable VNET(igmp_v1enable) 256 #define V_igmp_v2enable VNET(igmp_v2enable) 257 #define V_igmp_legacysupp VNET(igmp_legacysupp) 258 #define V_igmp_default_version VNET(igmp_default_version) 259 260 /* 261 * Virtualized sysctls. 262 */ 263 SYSCTL_PROC(_net_inet_igmp, IGMPCTL_STATS, stats, 264 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_MPSAFE, 265 &VNET_NAME(igmpstat), 0, sysctl_igmp_stat, "S,igmpstat", 266 "IGMP statistics (struct igmpstat, netinet/igmp_var.h)"); 267 SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 268 &VNET_NAME(igmp_recvifkludge), 0, 269 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 270 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 271 &VNET_NAME(igmp_sendra), 0, 272 "Send IP Router Alert option in IGMPv2/v3 messages"); 273 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 274 &VNET_NAME(igmp_sendlocal), 0, 275 "Send IGMP membership reports for 224.0.0.0/24 groups"); 276 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 277 &VNET_NAME(igmp_v1enable), 0, 278 "Enable backwards compatibility with IGMPv1"); 279 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 280 &VNET_NAME(igmp_v2enable), 0, 281 "Enable backwards compatibility with IGMPv2"); 282 SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 283 &VNET_NAME(igmp_legacysupp), 0, 284 "Allow v1/v2 reports to suppress v3 group responses"); 285 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 286 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 287 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 288 "Default version of IGMP to run on each interface"); 289 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 290 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 291 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 292 "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 293 294 /* 295 * Non-virtualized sysctls. 296 */ 297 static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 298 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 299 "Per-interface IGMPv3 state"); 300 301 static __inline void 302 igmp_save_context(struct mbuf *m, struct ifnet *ifp) 303 { 304 305 #ifdef VIMAGE 306 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 307 #endif /* VIMAGE */ 308 m->m_pkthdr.rcvif = ifp; 309 m->m_pkthdr.flowid = ifp->if_index; 310 } 311 312 static __inline void 313 igmp_scrub_context(struct mbuf *m) 314 { 315 316 m->m_pkthdr.PH_loc.ptr = NULL; 317 m->m_pkthdr.flowid = 0; 318 } 319 320 /* 321 * Restore context from a queued IGMP output chain. 322 * Return saved ifindex. 323 * 324 * VIMAGE: The assertion is there to make sure that we 325 * actually called CURVNET_SET() with what's in the mbuf chain. 326 */ 327 static __inline uint32_t 328 igmp_restore_context(struct mbuf *m) 329 { 330 331 #ifdef notyet 332 #if defined(VIMAGE) && defined(INVARIANTS) 333 KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 334 ("%s: called when curvnet was not restored", __func__)); 335 #endif 336 #endif 337 return (m->m_pkthdr.flowid); 338 } 339 340 /* 341 * IGMP statistics. 342 */ 343 static int 344 sysctl_igmp_stat(SYSCTL_HANDLER_ARGS) 345 { 346 struct igmpstat igps0; 347 int error; 348 char *p; 349 350 error = sysctl_wire_old_buffer(req, sizeof(struct igmpstat)); 351 if (error) 352 return (error); 353 354 if (req->oldptr != NULL) { 355 if (req->oldlen < sizeof(struct igmpstat)) 356 error = ENOMEM; 357 else { 358 /* 359 * Copy the counters, and explicitly set the struct's 360 * version and length fields. 361 */ 362 COUNTER_ARRAY_COPY(VNET(igmpstat), &igps0, 363 sizeof(struct igmpstat) / sizeof(uint64_t)); 364 igps0.igps_version = IGPS_VERSION_3; 365 igps0.igps_len = IGPS_VERSION3_LEN; 366 error = SYSCTL_OUT(req, &igps0, 367 sizeof(struct igmpstat)); 368 } 369 } else 370 req->validlen = sizeof(struct igmpstat); 371 if (error) 372 goto out; 373 if (req->newptr != NULL) { 374 if (req->newlen < sizeof(struct igmpstat)) 375 error = ENOMEM; 376 else 377 error = SYSCTL_IN(req, &igps0, 378 sizeof(igps0)); 379 if (error) 380 goto out; 381 /* 382 * igps0 must be "all zero". 383 */ 384 p = (char *)&igps0; 385 while (p < (char *)&igps0 + sizeof(igps0) && *p == '\0') 386 p++; 387 if (p != (char *)&igps0 + sizeof(igps0)) { 388 error = EINVAL; 389 goto out; 390 } 391 COUNTER_ARRAY_ZERO(VNET(igmpstat), 392 sizeof(struct igmpstat) / sizeof(uint64_t)); 393 } 394 out: 395 return (error); 396 } 397 398 /* 399 * Retrieve or set default IGMP version. 400 * 401 * VIMAGE: Assume curvnet set by caller. 402 * SMPng: NOTE: Serialized by IGMP lock. 403 */ 404 static int 405 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 406 { 407 int error; 408 int new; 409 410 error = sysctl_wire_old_buffer(req, sizeof(int)); 411 if (error) 412 return (error); 413 414 IGMP_LOCK(); 415 416 new = V_igmp_default_version; 417 418 error = sysctl_handle_int(oidp, &new, 0, req); 419 if (error || !req->newptr) 420 goto out_locked; 421 422 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 423 error = EINVAL; 424 goto out_locked; 425 } 426 427 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 428 V_igmp_default_version, new); 429 430 V_igmp_default_version = new; 431 432 out_locked: 433 IGMP_UNLOCK(); 434 return (error); 435 } 436 437 /* 438 * Retrieve or set threshold between group-source queries in seconds. 439 * 440 * VIMAGE: Assume curvnet set by caller. 441 * SMPng: NOTE: Serialized by IGMP lock. 442 */ 443 static int 444 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 445 { 446 int error; 447 int i; 448 449 error = sysctl_wire_old_buffer(req, sizeof(int)); 450 if (error) 451 return (error); 452 453 IGMP_LOCK(); 454 455 i = V_igmp_gsrdelay.tv_sec; 456 457 error = sysctl_handle_int(oidp, &i, 0, req); 458 if (error || !req->newptr) 459 goto out_locked; 460 461 if (i < -1 || i >= 60) { 462 error = EINVAL; 463 goto out_locked; 464 } 465 466 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 467 V_igmp_gsrdelay.tv_sec, i); 468 V_igmp_gsrdelay.tv_sec = i; 469 470 out_locked: 471 IGMP_UNLOCK(); 472 return (error); 473 } 474 475 /* 476 * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 477 * For use by ifmcstat(8). 478 * 479 * SMPng: NOTE: Does an unlocked ifindex space read. 480 * VIMAGE: Assume curvnet set by caller. The node handler itself 481 * is not directly virtualized. 482 */ 483 static int 484 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 485 { 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 if (name[0] <= 0 || name[0] > V_if_index) { 509 error = ENOENT; 510 goto out_locked; 511 } 512 513 error = ENOENT; 514 515 ifp = ifnet_byindex(name[0]); 516 if (ifp == NULL) 517 goto out_locked; 518 519 LIST_FOREACH(igi, &V_igi_head, igi_link) { 520 if (ifp == igi->igi_ifp) { 521 struct igmp_ifinfo info; 522 523 info.igi_version = igi->igi_version; 524 info.igi_v1_timer = igi->igi_v1_timer; 525 info.igi_v2_timer = igi->igi_v2_timer; 526 info.igi_v3_timer = igi->igi_v3_timer; 527 info.igi_flags = igi->igi_flags; 528 info.igi_rv = igi->igi_rv; 529 info.igi_qi = igi->igi_qi; 530 info.igi_qri = igi->igi_qri; 531 info.igi_uri = igi->igi_uri; 532 error = SYSCTL_OUT(req, &info, sizeof(info)); 533 break; 534 } 535 } 536 537 out_locked: 538 IGMP_UNLOCK(); 539 IN_MULTI_LIST_UNLOCK(); 540 return (error); 541 } 542 543 /* 544 * Dispatch an entire queue of pending packet chains 545 * using the netisr. 546 * VIMAGE: Assumes the vnet pointer has been set. 547 */ 548 static void 549 igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 550 { 551 struct epoch_tracker et; 552 struct mbuf *m; 553 554 NET_EPOCH_ENTER(et); 555 while ((m = mbufq_dequeue(mq)) != NULL) { 556 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 557 if (loop) 558 m->m_flags |= M_IGMP_LOOP; 559 netisr_dispatch(NETISR_IGMP, m); 560 if (--limit == 0) 561 break; 562 } 563 NET_EPOCH_EXIT(et); 564 } 565 566 /* 567 * Filter outgoing IGMP report state by group. 568 * 569 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 570 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 571 * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 572 * this may break certain IGMP snooping switches which rely on the old 573 * report behaviour. 574 * 575 * Return zero if the given group is one for which IGMP reports 576 * should be suppressed, or non-zero if reports should be issued. 577 */ 578 static __inline int 579 igmp_isgroupreported(const struct in_addr addr) 580 { 581 582 if (in_allhosts(addr) || 583 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 584 return (0); 585 586 return (1); 587 } 588 589 /* 590 * Construct a Router Alert option to use in outgoing packets. 591 */ 592 static struct mbuf * 593 igmp_ra_alloc(void) 594 { 595 struct mbuf *m; 596 struct ipoption *p; 597 598 m = m_get(M_WAITOK, MT_DATA); 599 p = mtod(m, struct ipoption *); 600 p->ipopt_dst.s_addr = INADDR_ANY; 601 p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 602 p->ipopt_list[1] = 0x04; /* 4 bytes long */ 603 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 604 p->ipopt_list[3] = 0x00; /* pad byte */ 605 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 606 607 return (m); 608 } 609 610 /* 611 * Attach IGMP when PF_INET is attached to an interface. 612 */ 613 struct igmp_ifsoftc * 614 igmp_domifattach(struct ifnet *ifp) 615 { 616 struct igmp_ifsoftc *igi; 617 618 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 619 __func__, ifp, ifp->if_xname); 620 621 IGMP_LOCK(); 622 623 igi = igi_alloc_locked(ifp); 624 if (!(ifp->if_flags & IFF_MULTICAST)) 625 igi->igi_flags |= IGIF_SILENT; 626 627 IGMP_UNLOCK(); 628 629 return (igi); 630 } 631 632 /* 633 * VIMAGE: assume curvnet set by caller. 634 */ 635 static struct igmp_ifsoftc * 636 igi_alloc_locked(/*const*/ struct ifnet *ifp) 637 { 638 struct igmp_ifsoftc *igi; 639 640 IGMP_LOCK_ASSERT(); 641 642 igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 643 if (igi == NULL) 644 goto out; 645 646 igi->igi_ifp = ifp; 647 igi->igi_version = V_igmp_default_version; 648 igi->igi_flags = 0; 649 igi->igi_rv = IGMP_RV_INIT; 650 igi->igi_qi = IGMP_QI_INIT; 651 igi->igi_qri = IGMP_QRI_INIT; 652 igi->igi_uri = IGMP_URI_INIT; 653 mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 654 655 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 656 657 CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 658 ifp, ifp->if_xname); 659 660 out: 661 return (igi); 662 } 663 664 /* 665 * Hook for ifdetach. 666 * 667 * NOTE: Some finalization tasks need to run before the protocol domain 668 * is detached, but also before the link layer does its cleanup. 669 * 670 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 671 * XXX This is also bitten by unlocked ifma_protospec access. 672 */ 673 void 674 igmp_ifdetach(struct ifnet *ifp) 675 { 676 struct igmp_ifsoftc *igi; 677 struct ifmultiaddr *ifma, *next; 678 struct in_multi *inm; 679 struct in_multi_head inm_free_tmp; 680 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 681 ifp->if_xname); 682 683 SLIST_INIT(&inm_free_tmp); 684 IGMP_LOCK(); 685 686 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 687 if (igi->igi_version == IGMP_VERSION_3) { 688 IF_ADDR_WLOCK(ifp); 689 restart: 690 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 691 if (ifma->ifma_addr->sa_family != AF_INET || 692 ifma->ifma_protospec == NULL) 693 continue; 694 inm = (struct in_multi *)ifma->ifma_protospec; 695 if (inm->inm_state == IGMP_LEAVING_MEMBER) 696 inm_rele_locked(&inm_free_tmp, inm); 697 inm_clear_recorded(inm); 698 if (__predict_false(ifma_restart)) { 699 ifma_restart = false; 700 goto restart; 701 } 702 } 703 IF_ADDR_WUNLOCK(ifp); 704 inm_release_list_deferred(&inm_free_tmp); 705 } 706 IGMP_UNLOCK(); 707 708 } 709 710 /* 711 * Hook for domifdetach. 712 */ 713 void 714 igmp_domifdetach(struct ifnet *ifp) 715 { 716 717 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 718 __func__, ifp, ifp->if_xname); 719 720 IGMP_LOCK(); 721 igi_delete_locked(ifp); 722 IGMP_UNLOCK(); 723 } 724 725 static void 726 igi_delete_locked(const struct ifnet *ifp) 727 { 728 struct igmp_ifsoftc *igi, *tigi; 729 730 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 731 __func__, ifp, ifp->if_xname); 732 733 IGMP_LOCK_ASSERT(); 734 735 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 736 if (igi->igi_ifp == ifp) { 737 /* 738 * Free deferred General Query responses. 739 */ 740 mbufq_drain(&igi->igi_gq); 741 742 LIST_REMOVE(igi, igi_link); 743 free(igi, M_IGMP); 744 return; 745 } 746 } 747 } 748 749 /* 750 * Process a received IGMPv1 query. 751 * Return non-zero if the message should be dropped. 752 * 753 * VIMAGE: The curvnet pointer is derived from the input ifp. 754 */ 755 static int 756 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 757 const struct igmp *igmp) 758 { 759 struct ifmultiaddr *ifma; 760 struct igmp_ifsoftc *igi; 761 struct in_multi *inm; 762 763 NET_EPOCH_ASSERT(); 764 765 /* 766 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 767 * 224.0.0.1. They are always treated as General Queries. 768 * igmp_group is always ignored. Do not drop it as a userland 769 * daemon may wish to see it. 770 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 771 */ 772 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 773 IGMPSTAT_INC(igps_rcv_badqueries); 774 return (0); 775 } 776 IGMPSTAT_INC(igps_rcv_gen_queries); 777 778 IN_MULTI_LIST_LOCK(); 779 IGMP_LOCK(); 780 781 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 782 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 783 784 if (igi->igi_flags & IGIF_LOOPBACK) { 785 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 786 ifp, ifp->if_xname); 787 goto out_locked; 788 } 789 790 /* 791 * Switch to IGMPv1 host compatibility mode. 792 */ 793 igmp_set_version(igi, IGMP_VERSION_1); 794 795 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 796 797 /* 798 * Start the timers in all of our group records 799 * for the interface on which the query arrived, 800 * except those which are already running. 801 */ 802 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 803 if (ifma->ifma_addr->sa_family != AF_INET || 804 ifma->ifma_protospec == NULL) 805 continue; 806 inm = (struct in_multi *)ifma->ifma_protospec; 807 if (inm->inm_timer != 0) 808 continue; 809 switch (inm->inm_state) { 810 case IGMP_NOT_MEMBER: 811 case IGMP_SILENT_MEMBER: 812 break; 813 case IGMP_G_QUERY_PENDING_MEMBER: 814 case IGMP_SG_QUERY_PENDING_MEMBER: 815 case IGMP_REPORTING_MEMBER: 816 case IGMP_IDLE_MEMBER: 817 case IGMP_LAZY_MEMBER: 818 case IGMP_SLEEPING_MEMBER: 819 case IGMP_AWAKENING_MEMBER: 820 inm->inm_state = IGMP_REPORTING_MEMBER; 821 inm->inm_timer = IGMP_RANDOM_DELAY( 822 IGMP_V1V2_MAX_RI * PR_FASTHZ); 823 V_current_state_timers_running = 1; 824 break; 825 case IGMP_LEAVING_MEMBER: 826 break; 827 } 828 } 829 830 out_locked: 831 IGMP_UNLOCK(); 832 IN_MULTI_LIST_UNLOCK(); 833 834 return (0); 835 } 836 837 /* 838 * Process a received IGMPv2 general or group-specific query. 839 */ 840 static int 841 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 842 const struct igmp *igmp) 843 { 844 struct ifmultiaddr *ifma; 845 struct igmp_ifsoftc *igi; 846 struct in_multi *inm; 847 int is_general_query; 848 uint16_t timer; 849 850 NET_EPOCH_ASSERT(); 851 852 is_general_query = 0; 853 854 /* 855 * Validate address fields upfront. 856 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 857 */ 858 if (in_nullhost(igmp->igmp_group)) { 859 /* 860 * IGMPv2 General Query. 861 * If this was not sent to the all-hosts group, ignore it. 862 */ 863 if (!in_allhosts(ip->ip_dst)) 864 return (0); 865 IGMPSTAT_INC(igps_rcv_gen_queries); 866 is_general_query = 1; 867 } else { 868 /* IGMPv2 Group-Specific Query. */ 869 IGMPSTAT_INC(igps_rcv_group_queries); 870 } 871 872 IN_MULTI_LIST_LOCK(); 873 IGMP_LOCK(); 874 875 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 876 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 877 878 if (igi->igi_flags & IGIF_LOOPBACK) { 879 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 880 ifp, ifp->if_xname); 881 goto out_locked; 882 } 883 884 /* 885 * Ignore v2 query if in v1 Compatibility Mode. 886 */ 887 if (igi->igi_version == IGMP_VERSION_1) 888 goto out_locked; 889 890 igmp_set_version(igi, IGMP_VERSION_2); 891 892 timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE; 893 if (timer == 0) 894 timer = 1; 895 896 if (is_general_query) { 897 /* 898 * For each reporting group joined on this 899 * interface, kick the report timer. 900 */ 901 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 902 ifp, ifp->if_xname); 903 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 904 if (ifma->ifma_addr->sa_family != AF_INET || 905 ifma->ifma_protospec == NULL) 906 continue; 907 inm = (struct in_multi *)ifma->ifma_protospec; 908 igmp_v2_update_group(inm, timer); 909 } 910 } else { 911 /* 912 * Group-specific IGMPv2 query, we need only 913 * look up the single group to process it. 914 */ 915 inm = inm_lookup(ifp, igmp->igmp_group); 916 if (inm != NULL) { 917 CTR3(KTR_IGMPV3, 918 "process v2 query 0x%08x on ifp %p(%s)", 919 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 920 igmp_v2_update_group(inm, timer); 921 } 922 } 923 924 out_locked: 925 IGMP_UNLOCK(); 926 IN_MULTI_LIST_UNLOCK(); 927 928 return (0); 929 } 930 931 /* 932 * Update the report timer on a group in response to an IGMPv2 query. 933 * 934 * If we are becoming the reporting member for this group, start the timer. 935 * If we already are the reporting member for this group, and timer is 936 * below the threshold, reset it. 937 * 938 * We may be updating the group for the first time since we switched 939 * to IGMPv3. If we are, then we must clear any recorded source lists, 940 * and transition to REPORTING state; the group timer is overloaded 941 * for group and group-source query responses. 942 * 943 * Unlike IGMPv3, the delay per group should be jittered 944 * to avoid bursts of IGMPv2 reports. 945 */ 946 static void 947 igmp_v2_update_group(struct in_multi *inm, const int timer) 948 { 949 950 CTR4(KTR_IGMPV3, "0x%08x: %s/%s timer=%d", __func__, 951 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname, timer); 952 953 IN_MULTI_LIST_LOCK_ASSERT(); 954 955 switch (inm->inm_state) { 956 case IGMP_NOT_MEMBER: 957 case IGMP_SILENT_MEMBER: 958 break; 959 case IGMP_REPORTING_MEMBER: 960 if (inm->inm_timer != 0 && 961 inm->inm_timer <= timer) { 962 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 963 "skipping.", __func__); 964 break; 965 } 966 /* FALLTHROUGH */ 967 case IGMP_SG_QUERY_PENDING_MEMBER: 968 case IGMP_G_QUERY_PENDING_MEMBER: 969 case IGMP_IDLE_MEMBER: 970 case IGMP_LAZY_MEMBER: 971 case IGMP_AWAKENING_MEMBER: 972 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 973 inm->inm_state = IGMP_REPORTING_MEMBER; 974 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 975 V_current_state_timers_running = 1; 976 break; 977 case IGMP_SLEEPING_MEMBER: 978 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 979 inm->inm_state = IGMP_AWAKENING_MEMBER; 980 break; 981 case IGMP_LEAVING_MEMBER: 982 break; 983 } 984 } 985 986 /* 987 * Process a received IGMPv3 general, group-specific or 988 * group-and-source-specific query. 989 * Assumes m has already been pulled up to the full IGMP message length. 990 * Return 0 if successful, otherwise an appropriate error code is returned. 991 */ 992 static int 993 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 994 /*const*/ struct igmpv3 *igmpv3) 995 { 996 struct igmp_ifsoftc *igi; 997 struct in_multi *inm; 998 int is_general_query; 999 uint32_t maxresp, nsrc, qqi; 1000 uint16_t timer; 1001 uint8_t qrv; 1002 1003 is_general_query = 0; 1004 1005 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 1006 1007 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 1008 if (maxresp >= 128) { 1009 maxresp = IGMP_MANT(igmpv3->igmp_code) << 1010 (IGMP_EXP(igmpv3->igmp_code) + 3); 1011 } 1012 1013 /* 1014 * Robustness must never be less than 2 for on-wire IGMPv3. 1015 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 1016 * an exception for interfaces whose IGMPv3 state changes 1017 * are redirected to loopback (e.g. MANET). 1018 */ 1019 qrv = IGMP_QRV(igmpv3->igmp_misc); 1020 if (qrv < 2) { 1021 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 1022 qrv, IGMP_RV_INIT); 1023 qrv = IGMP_RV_INIT; 1024 } 1025 1026 qqi = igmpv3->igmp_qqi; 1027 if (qqi >= 128) { 1028 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 1029 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 1030 } 1031 1032 timer = maxresp * PR_FASTHZ / IGMP_TIMER_SCALE; 1033 if (timer == 0) 1034 timer = 1; 1035 1036 nsrc = ntohs(igmpv3->igmp_numsrc); 1037 1038 /* 1039 * Validate address fields and versions upfront before 1040 * accepting v3 query. 1041 * XXX SMPng: Unlocked access to igmpstat counters here. 1042 */ 1043 if (in_nullhost(igmpv3->igmp_group)) { 1044 /* 1045 * IGMPv3 General Query. 1046 * 1047 * General Queries SHOULD be directed to 224.0.0.1. 1048 * A general query with a source list has undefined 1049 * behaviour; discard it. 1050 */ 1051 IGMPSTAT_INC(igps_rcv_gen_queries); 1052 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1053 IGMPSTAT_INC(igps_rcv_badqueries); 1054 return (0); 1055 } 1056 is_general_query = 1; 1057 } else { 1058 /* Group or group-source specific query. */ 1059 if (nsrc == 0) 1060 IGMPSTAT_INC(igps_rcv_group_queries); 1061 else 1062 IGMPSTAT_INC(igps_rcv_gsr_queries); 1063 } 1064 1065 IN_MULTI_LIST_LOCK(); 1066 IGMP_LOCK(); 1067 1068 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1069 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1070 1071 if (igi->igi_flags & IGIF_LOOPBACK) { 1072 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1073 ifp, ifp->if_xname); 1074 goto out_locked; 1075 } 1076 1077 /* 1078 * Discard the v3 query if we're in Compatibility Mode. 1079 * The RFC is not obviously worded that hosts need to stay in 1080 * compatibility mode until the Old Version Querier Present 1081 * timer expires. 1082 */ 1083 if (igi->igi_version != IGMP_VERSION_3) { 1084 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1085 igi->igi_version, ifp, ifp->if_xname); 1086 goto out_locked; 1087 } 1088 1089 igmp_set_version(igi, IGMP_VERSION_3); 1090 igi->igi_rv = qrv; 1091 igi->igi_qi = qqi; 1092 igi->igi_qri = maxresp; 1093 1094 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1095 maxresp); 1096 1097 if (is_general_query) { 1098 /* 1099 * Schedule a current-state report on this ifp for 1100 * all groups, possibly containing source lists. 1101 * If there is a pending General Query response 1102 * scheduled earlier than the selected delay, do 1103 * not schedule any other reports. 1104 * Otherwise, reset the interface timer. 1105 */ 1106 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1107 ifp, ifp->if_xname); 1108 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1109 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1110 V_interface_timers_running = 1; 1111 } 1112 } else { 1113 /* 1114 * Group-source-specific queries are throttled on 1115 * a per-group basis to defeat denial-of-service attempts. 1116 * Queries for groups we are not a member of on this 1117 * link are simply ignored. 1118 */ 1119 inm = inm_lookup(ifp, igmpv3->igmp_group); 1120 if (inm == NULL) 1121 goto out_locked; 1122 if (nsrc > 0) { 1123 if (!ratecheck(&inm->inm_lastgsrtv, 1124 &V_igmp_gsrdelay)) { 1125 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1126 __func__); 1127 IGMPSTAT_INC(igps_drop_gsr_queries); 1128 goto out_locked; 1129 } 1130 } 1131 CTR3(KTR_IGMPV3, "process v3 0x%08x query on ifp %p(%s)", 1132 ntohl(igmpv3->igmp_group.s_addr), ifp, ifp->if_xname); 1133 /* 1134 * If there is a pending General Query response 1135 * scheduled sooner than the selected delay, no 1136 * further report need be scheduled. 1137 * Otherwise, prepare to respond to the 1138 * group-specific or group-and-source query. 1139 */ 1140 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1141 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1142 } 1143 1144 out_locked: 1145 IGMP_UNLOCK(); 1146 IN_MULTI_LIST_UNLOCK(); 1147 1148 return (0); 1149 } 1150 1151 /* 1152 * Process a received IGMPv3 group-specific or group-and-source-specific 1153 * query. 1154 * Return <0 if any error occurred. Currently this is ignored. 1155 */ 1156 static int 1157 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1158 int timer, /*const*/ struct igmpv3 *igmpv3) 1159 { 1160 int retval; 1161 uint16_t nsrc; 1162 1163 IN_MULTI_LIST_LOCK_ASSERT(); 1164 IGMP_LOCK_ASSERT(); 1165 1166 retval = 0; 1167 1168 switch (inm->inm_state) { 1169 case IGMP_NOT_MEMBER: 1170 case IGMP_SILENT_MEMBER: 1171 case IGMP_SLEEPING_MEMBER: 1172 case IGMP_LAZY_MEMBER: 1173 case IGMP_AWAKENING_MEMBER: 1174 case IGMP_IDLE_MEMBER: 1175 case IGMP_LEAVING_MEMBER: 1176 return (retval); 1177 break; 1178 case IGMP_REPORTING_MEMBER: 1179 case IGMP_G_QUERY_PENDING_MEMBER: 1180 case IGMP_SG_QUERY_PENDING_MEMBER: 1181 break; 1182 } 1183 1184 nsrc = ntohs(igmpv3->igmp_numsrc); 1185 1186 /* 1187 * Deal with group-specific queries upfront. 1188 * If any group query is already pending, purge any recorded 1189 * source-list state if it exists, and schedule a query response 1190 * for this group-specific query. 1191 */ 1192 if (nsrc == 0) { 1193 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1194 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1195 inm_clear_recorded(inm); 1196 timer = min(inm->inm_timer, timer); 1197 } 1198 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1199 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1200 V_current_state_timers_running = 1; 1201 return (retval); 1202 } 1203 1204 /* 1205 * Deal with the case where a group-and-source-specific query has 1206 * been received but a group-specific query is already pending. 1207 */ 1208 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1209 timer = min(inm->inm_timer, timer); 1210 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1211 V_current_state_timers_running = 1; 1212 return (retval); 1213 } 1214 1215 /* 1216 * Finally, deal with the case where a group-and-source-specific 1217 * query has been received, where a response to a previous g-s-r 1218 * query exists, or none exists. 1219 * In this case, we need to parse the source-list which the Querier 1220 * has provided us with and check if we have any source list filter 1221 * entries at T1 for these sources. If we do not, there is no need 1222 * schedule a report and the query may be dropped. 1223 * If we do, we must record them and schedule a current-state 1224 * report for those sources. 1225 * FIXME: Handling source lists larger than 1 mbuf requires that 1226 * we pass the mbuf chain pointer down to this function, and use 1227 * m_getptr() to walk the chain. 1228 */ 1229 if (inm->inm_nsrc > 0) { 1230 const struct in_addr *ap; 1231 int i, nrecorded; 1232 1233 ap = (const struct in_addr *)(igmpv3 + 1); 1234 nrecorded = 0; 1235 for (i = 0; i < nsrc; i++, ap++) { 1236 retval = inm_record_source(inm, ap->s_addr); 1237 if (retval < 0) 1238 break; 1239 nrecorded += retval; 1240 } 1241 if (nrecorded > 0) { 1242 CTR1(KTR_IGMPV3, 1243 "%s: schedule response to SG query", __func__); 1244 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1245 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1246 V_current_state_timers_running = 1; 1247 } 1248 } 1249 1250 return (retval); 1251 } 1252 1253 /* 1254 * Process a received IGMPv1 host membership report. 1255 * 1256 * NOTE: 0.0.0.0 workaround breaks const correctness. 1257 */ 1258 static int 1259 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1260 /*const*/ struct igmp *igmp) 1261 { 1262 struct rm_priotracker in_ifa_tracker; 1263 struct in_ifaddr *ia; 1264 struct in_multi *inm; 1265 1266 IGMPSTAT_INC(igps_rcv_reports); 1267 1268 if (ifp->if_flags & IFF_LOOPBACK) 1269 return (0); 1270 1271 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1272 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1273 IGMPSTAT_INC(igps_rcv_badreports); 1274 return (EINVAL); 1275 } 1276 1277 /* 1278 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1279 * Booting clients may use the source address 0.0.0.0. Some 1280 * IGMP daemons may not know how to use IP_RECVIF to determine 1281 * the interface upon which this message was received. 1282 * Replace 0.0.0.0 with the subnet address if told to do so. 1283 */ 1284 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1285 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 1286 if (ia != NULL) 1287 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1288 } 1289 1290 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1291 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1292 1293 /* 1294 * IGMPv1 report suppression. 1295 * If we are a member of this group, and our membership should be 1296 * reported, stop our group timer and transition to the 'lazy' state. 1297 */ 1298 IN_MULTI_LIST_LOCK(); 1299 inm = inm_lookup(ifp, igmp->igmp_group); 1300 if (inm != NULL) { 1301 struct igmp_ifsoftc *igi; 1302 1303 igi = inm->inm_igi; 1304 if (igi == NULL) { 1305 KASSERT(igi != NULL, 1306 ("%s: no igi for ifp %p", __func__, ifp)); 1307 goto out_locked; 1308 } 1309 1310 IGMPSTAT_INC(igps_rcv_ourreports); 1311 1312 /* 1313 * If we are in IGMPv3 host mode, do not allow the 1314 * other host's IGMPv1 report to suppress our reports 1315 * unless explicitly configured to do so. 1316 */ 1317 if (igi->igi_version == IGMP_VERSION_3) { 1318 if (V_igmp_legacysupp) 1319 igmp_v3_suppress_group_record(inm); 1320 goto out_locked; 1321 } 1322 1323 inm->inm_timer = 0; 1324 1325 switch (inm->inm_state) { 1326 case IGMP_NOT_MEMBER: 1327 case IGMP_SILENT_MEMBER: 1328 break; 1329 case IGMP_IDLE_MEMBER: 1330 case IGMP_LAZY_MEMBER: 1331 case IGMP_AWAKENING_MEMBER: 1332 CTR3(KTR_IGMPV3, 1333 "report suppressed for 0x%08x on ifp %p(%s)", 1334 ntohl(igmp->igmp_group.s_addr), ifp, 1335 ifp->if_xname); 1336 case IGMP_SLEEPING_MEMBER: 1337 inm->inm_state = IGMP_SLEEPING_MEMBER; 1338 break; 1339 case IGMP_REPORTING_MEMBER: 1340 CTR3(KTR_IGMPV3, 1341 "report suppressed for 0x%08x on ifp %p(%s)", 1342 ntohl(igmp->igmp_group.s_addr), ifp, 1343 ifp->if_xname); 1344 if (igi->igi_version == IGMP_VERSION_1) 1345 inm->inm_state = IGMP_LAZY_MEMBER; 1346 else if (igi->igi_version == IGMP_VERSION_2) 1347 inm->inm_state = IGMP_SLEEPING_MEMBER; 1348 break; 1349 case IGMP_G_QUERY_PENDING_MEMBER: 1350 case IGMP_SG_QUERY_PENDING_MEMBER: 1351 case IGMP_LEAVING_MEMBER: 1352 break; 1353 } 1354 } 1355 1356 out_locked: 1357 IN_MULTI_LIST_UNLOCK(); 1358 1359 return (0); 1360 } 1361 1362 /* 1363 * Process a received IGMPv2 host membership report. 1364 * 1365 * NOTE: 0.0.0.0 workaround breaks const correctness. 1366 */ 1367 static int 1368 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1369 /*const*/ struct igmp *igmp) 1370 { 1371 struct rm_priotracker in_ifa_tracker; 1372 struct in_ifaddr *ia; 1373 struct in_multi *inm; 1374 1375 /* 1376 * Make sure we don't hear our own membership report. Fast 1377 * leave requires knowing that we are the only member of a 1378 * group. 1379 */ 1380 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 1381 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1382 return (0); 1383 } 1384 1385 IGMPSTAT_INC(igps_rcv_reports); 1386 1387 if (ifp->if_flags & IFF_LOOPBACK) { 1388 return (0); 1389 } 1390 1391 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1392 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1393 IGMPSTAT_INC(igps_rcv_badreports); 1394 return (EINVAL); 1395 } 1396 1397 /* 1398 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1399 * Booting clients may use the source address 0.0.0.0. Some 1400 * IGMP daemons may not know how to use IP_RECVIF to determine 1401 * the interface upon which this message was received. 1402 * Replace 0.0.0.0 with the subnet address if told to do so. 1403 */ 1404 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1405 if (ia != NULL) 1406 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1407 } 1408 1409 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1410 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1411 1412 /* 1413 * IGMPv2 report suppression. 1414 * If we are a member of this group, and our membership should be 1415 * reported, and our group timer is pending or about to be reset, 1416 * stop our group timer by transitioning to the 'lazy' state. 1417 */ 1418 IN_MULTI_LIST_LOCK(); 1419 inm = inm_lookup(ifp, igmp->igmp_group); 1420 if (inm != NULL) { 1421 struct igmp_ifsoftc *igi; 1422 1423 igi = inm->inm_igi; 1424 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1425 1426 IGMPSTAT_INC(igps_rcv_ourreports); 1427 1428 /* 1429 * If we are in IGMPv3 host mode, do not allow the 1430 * other host's IGMPv1 report to suppress our reports 1431 * unless explicitly configured to do so. 1432 */ 1433 if (igi->igi_version == IGMP_VERSION_3) { 1434 if (V_igmp_legacysupp) 1435 igmp_v3_suppress_group_record(inm); 1436 goto out_locked; 1437 } 1438 1439 inm->inm_timer = 0; 1440 1441 switch (inm->inm_state) { 1442 case IGMP_NOT_MEMBER: 1443 case IGMP_SILENT_MEMBER: 1444 case IGMP_SLEEPING_MEMBER: 1445 break; 1446 case IGMP_REPORTING_MEMBER: 1447 case IGMP_IDLE_MEMBER: 1448 case IGMP_AWAKENING_MEMBER: 1449 CTR3(KTR_IGMPV3, 1450 "report suppressed for 0x%08x on ifp %p(%s)", 1451 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1452 case IGMP_LAZY_MEMBER: 1453 inm->inm_state = IGMP_LAZY_MEMBER; 1454 break; 1455 case IGMP_G_QUERY_PENDING_MEMBER: 1456 case IGMP_SG_QUERY_PENDING_MEMBER: 1457 case IGMP_LEAVING_MEMBER: 1458 break; 1459 } 1460 } 1461 1462 out_locked: 1463 IN_MULTI_LIST_UNLOCK(); 1464 1465 return (0); 1466 } 1467 1468 int 1469 igmp_input(struct mbuf **mp, int *offp, int proto) 1470 { 1471 int iphlen; 1472 struct ifnet *ifp; 1473 struct igmp *igmp; 1474 struct ip *ip; 1475 struct mbuf *m; 1476 int igmplen; 1477 int minlen; 1478 int queryver; 1479 1480 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1481 1482 m = *mp; 1483 ifp = m->m_pkthdr.rcvif; 1484 *mp = NULL; 1485 1486 IGMPSTAT_INC(igps_rcv_total); 1487 1488 ip = mtod(m, struct ip *); 1489 iphlen = *offp; 1490 igmplen = ntohs(ip->ip_len) - iphlen; 1491 1492 /* 1493 * Validate lengths. 1494 */ 1495 if (igmplen < IGMP_MINLEN) { 1496 IGMPSTAT_INC(igps_rcv_tooshort); 1497 m_freem(m); 1498 return (IPPROTO_DONE); 1499 } 1500 1501 /* 1502 * Always pullup to the minimum size for v1/v2 or v3 1503 * to amortize calls to m_pullup(). 1504 */ 1505 minlen = iphlen; 1506 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1507 minlen += IGMP_V3_QUERY_MINLEN; 1508 else 1509 minlen += IGMP_MINLEN; 1510 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1511 (m = m_pullup(m, minlen)) == NULL) { 1512 IGMPSTAT_INC(igps_rcv_tooshort); 1513 return (IPPROTO_DONE); 1514 } 1515 ip = mtod(m, struct ip *); 1516 1517 /* 1518 * Validate checksum. 1519 */ 1520 m->m_data += iphlen; 1521 m->m_len -= iphlen; 1522 igmp = mtod(m, struct igmp *); 1523 if (in_cksum(m, igmplen)) { 1524 IGMPSTAT_INC(igps_rcv_badsum); 1525 m_freem(m); 1526 return (IPPROTO_DONE); 1527 } 1528 m->m_data -= iphlen; 1529 m->m_len += iphlen; 1530 1531 /* 1532 * IGMP control traffic is link-scope, and must have a TTL of 1. 1533 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1534 * probe packets may come from beyond the LAN. 1535 */ 1536 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1537 IGMPSTAT_INC(igps_rcv_badttl); 1538 m_freem(m); 1539 return (IPPROTO_DONE); 1540 } 1541 1542 switch (igmp->igmp_type) { 1543 case IGMP_HOST_MEMBERSHIP_QUERY: 1544 if (igmplen == IGMP_MINLEN) { 1545 if (igmp->igmp_code == 0) 1546 queryver = IGMP_VERSION_1; 1547 else 1548 queryver = IGMP_VERSION_2; 1549 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1550 queryver = IGMP_VERSION_3; 1551 } else { 1552 IGMPSTAT_INC(igps_rcv_tooshort); 1553 m_freem(m); 1554 return (IPPROTO_DONE); 1555 } 1556 1557 switch (queryver) { 1558 case IGMP_VERSION_1: 1559 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1560 if (!V_igmp_v1enable) 1561 break; 1562 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1563 m_freem(m); 1564 return (IPPROTO_DONE); 1565 } 1566 break; 1567 1568 case IGMP_VERSION_2: 1569 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1570 if (!V_igmp_v2enable) 1571 break; 1572 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1573 m_freem(m); 1574 return (IPPROTO_DONE); 1575 } 1576 break; 1577 1578 case IGMP_VERSION_3: { 1579 struct igmpv3 *igmpv3; 1580 uint16_t igmpv3len; 1581 uint16_t nsrc; 1582 1583 IGMPSTAT_INC(igps_rcv_v3_queries); 1584 igmpv3 = (struct igmpv3 *)igmp; 1585 /* 1586 * Validate length based on source count. 1587 */ 1588 nsrc = ntohs(igmpv3->igmp_numsrc); 1589 if (nsrc * sizeof(in_addr_t) > 1590 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1591 IGMPSTAT_INC(igps_rcv_tooshort); 1592 m_freem(m); 1593 return (IPPROTO_DONE); 1594 } 1595 /* 1596 * m_pullup() may modify m, so pullup in 1597 * this scope. 1598 */ 1599 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1600 sizeof(struct in_addr) * nsrc; 1601 if ((!M_WRITABLE(m) || 1602 m->m_len < igmpv3len) && 1603 (m = m_pullup(m, igmpv3len)) == NULL) { 1604 IGMPSTAT_INC(igps_rcv_tooshort); 1605 return (IPPROTO_DONE); 1606 } 1607 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1608 + iphlen); 1609 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1610 m_freem(m); 1611 return (IPPROTO_DONE); 1612 } 1613 } 1614 break; 1615 } 1616 break; 1617 1618 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1619 if (!V_igmp_v1enable) 1620 break; 1621 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1622 m_freem(m); 1623 return (IPPROTO_DONE); 1624 } 1625 break; 1626 1627 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1628 if (!V_igmp_v2enable) 1629 break; 1630 if (!ip_checkrouteralert(m)) 1631 IGMPSTAT_INC(igps_rcv_nora); 1632 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1633 m_freem(m); 1634 return (IPPROTO_DONE); 1635 } 1636 break; 1637 1638 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1639 /* 1640 * Hosts do not need to process IGMPv3 membership reports, 1641 * as report suppression is no longer required. 1642 */ 1643 if (!ip_checkrouteralert(m)) 1644 IGMPSTAT_INC(igps_rcv_nora); 1645 break; 1646 1647 default: 1648 break; 1649 } 1650 1651 /* 1652 * Pass all valid IGMP packets up to any process(es) listening on a 1653 * raw IGMP socket. 1654 */ 1655 *mp = m; 1656 return (rip_input(mp, offp, proto)); 1657 } 1658 1659 /* 1660 * Fast timeout handler (global). 1661 * VIMAGE: Timeout handlers are expected to service all vimages. 1662 */ 1663 void 1664 igmp_fasttimo(void) 1665 { 1666 VNET_ITERATOR_DECL(vnet_iter); 1667 1668 VNET_LIST_RLOCK_NOSLEEP(); 1669 VNET_FOREACH(vnet_iter) { 1670 CURVNET_SET(vnet_iter); 1671 igmp_fasttimo_vnet(); 1672 CURVNET_RESTORE(); 1673 } 1674 VNET_LIST_RUNLOCK_NOSLEEP(); 1675 } 1676 1677 /* 1678 * Fast timeout handler (per-vnet). 1679 * Sends are shuffled off to a netisr to deal with Giant. 1680 * 1681 * VIMAGE: Assume caller has set up our curvnet. 1682 */ 1683 static void 1684 igmp_fasttimo_vnet(void) 1685 { 1686 struct mbufq scq; /* State-change packets */ 1687 struct mbufq qrq; /* Query response packets */ 1688 struct ifnet *ifp; 1689 struct igmp_ifsoftc *igi; 1690 struct ifmultiaddr *ifma, *next; 1691 struct in_multi *inm; 1692 struct in_multi_head inm_free_tmp; 1693 int loop, uri_fasthz; 1694 1695 loop = 0; 1696 uri_fasthz = 0; 1697 1698 /* 1699 * Quick check to see if any work needs to be done, in order to 1700 * minimize the overhead of fasttimo processing. 1701 * SMPng: XXX Unlocked reads. 1702 */ 1703 if (!V_current_state_timers_running && 1704 !V_interface_timers_running && 1705 !V_state_change_timers_running) 1706 return; 1707 1708 SLIST_INIT(&inm_free_tmp); 1709 IN_MULTI_LIST_LOCK(); 1710 IGMP_LOCK(); 1711 1712 /* 1713 * IGMPv3 General Query response timer processing. 1714 */ 1715 if (V_interface_timers_running) { 1716 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1717 1718 V_interface_timers_running = 0; 1719 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1720 if (igi->igi_v3_timer == 0) { 1721 /* Do nothing. */ 1722 } else if (--igi->igi_v3_timer == 0) { 1723 igmp_v3_dispatch_general_query(igi); 1724 } else { 1725 V_interface_timers_running = 1; 1726 } 1727 } 1728 } 1729 1730 if (!V_current_state_timers_running && 1731 !V_state_change_timers_running) 1732 goto out_locked; 1733 1734 V_current_state_timers_running = 0; 1735 V_state_change_timers_running = 0; 1736 1737 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1738 1739 /* 1740 * IGMPv1/v2/v3 host report and state-change timer processing. 1741 * Note: Processing a v3 group timer may remove a node. 1742 */ 1743 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1744 ifp = igi->igi_ifp; 1745 1746 if (igi->igi_version == IGMP_VERSION_3) { 1747 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1748 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1749 PR_FASTHZ); 1750 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1751 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1752 } 1753 1754 IF_ADDR_WLOCK(ifp); 1755 restart: 1756 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 1757 if (ifma->ifma_addr->sa_family != AF_INET || 1758 ifma->ifma_protospec == NULL) 1759 continue; 1760 inm = (struct in_multi *)ifma->ifma_protospec; 1761 switch (igi->igi_version) { 1762 case IGMP_VERSION_1: 1763 case IGMP_VERSION_2: 1764 igmp_v1v2_process_group_timer(inm, 1765 igi->igi_version); 1766 break; 1767 case IGMP_VERSION_3: 1768 igmp_v3_process_group_timers(&inm_free_tmp, &qrq, 1769 &scq, inm, uri_fasthz); 1770 break; 1771 } 1772 if (__predict_false(ifma_restart)) { 1773 ifma_restart = false; 1774 goto restart; 1775 } 1776 } 1777 IF_ADDR_WUNLOCK(ifp); 1778 1779 if (igi->igi_version == IGMP_VERSION_3) { 1780 igmp_dispatch_queue(&qrq, 0, loop); 1781 igmp_dispatch_queue(&scq, 0, loop); 1782 1783 /* 1784 * Free the in_multi reference(s) for this 1785 * IGMP lifecycle. 1786 */ 1787 inm_release_list_deferred(&inm_free_tmp); 1788 } 1789 } 1790 1791 out_locked: 1792 IGMP_UNLOCK(); 1793 IN_MULTI_LIST_UNLOCK(); 1794 } 1795 1796 /* 1797 * Update host report group timer for IGMPv1/v2. 1798 * Will update the global pending timer flags. 1799 */ 1800 static void 1801 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1802 { 1803 int report_timer_expired; 1804 1805 IN_MULTI_LIST_LOCK_ASSERT(); 1806 IGMP_LOCK_ASSERT(); 1807 1808 if (inm->inm_timer == 0) { 1809 report_timer_expired = 0; 1810 } else if (--inm->inm_timer == 0) { 1811 report_timer_expired = 1; 1812 } else { 1813 V_current_state_timers_running = 1; 1814 return; 1815 } 1816 1817 switch (inm->inm_state) { 1818 case IGMP_NOT_MEMBER: 1819 case IGMP_SILENT_MEMBER: 1820 case IGMP_IDLE_MEMBER: 1821 case IGMP_LAZY_MEMBER: 1822 case IGMP_SLEEPING_MEMBER: 1823 case IGMP_AWAKENING_MEMBER: 1824 break; 1825 case IGMP_REPORTING_MEMBER: 1826 if (report_timer_expired) { 1827 inm->inm_state = IGMP_IDLE_MEMBER; 1828 (void)igmp_v1v2_queue_report(inm, 1829 (version == IGMP_VERSION_2) ? 1830 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1831 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1832 } 1833 break; 1834 case IGMP_G_QUERY_PENDING_MEMBER: 1835 case IGMP_SG_QUERY_PENDING_MEMBER: 1836 case IGMP_LEAVING_MEMBER: 1837 break; 1838 } 1839 } 1840 1841 /* 1842 * Update a group's timers for IGMPv3. 1843 * Will update the global pending timer flags. 1844 * Note: Unlocked read from igi. 1845 */ 1846 static void 1847 igmp_v3_process_group_timers(struct in_multi_head *inmh, 1848 struct mbufq *qrq, struct mbufq *scq, 1849 struct in_multi *inm, const int uri_fasthz) 1850 { 1851 int query_response_timer_expired; 1852 int state_change_retransmit_timer_expired; 1853 1854 IN_MULTI_LIST_LOCK_ASSERT(); 1855 IGMP_LOCK_ASSERT(); 1856 1857 query_response_timer_expired = 0; 1858 state_change_retransmit_timer_expired = 0; 1859 1860 /* 1861 * During a transition from v1/v2 compatibility mode back to v3, 1862 * a group record in REPORTING state may still have its group 1863 * timer active. This is a no-op in this function; it is easier 1864 * to deal with it here than to complicate the slow-timeout path. 1865 */ 1866 if (inm->inm_timer == 0) { 1867 query_response_timer_expired = 0; 1868 } else if (--inm->inm_timer == 0) { 1869 query_response_timer_expired = 1; 1870 } else { 1871 V_current_state_timers_running = 1; 1872 } 1873 1874 if (inm->inm_sctimer == 0) { 1875 state_change_retransmit_timer_expired = 0; 1876 } else if (--inm->inm_sctimer == 0) { 1877 state_change_retransmit_timer_expired = 1; 1878 } else { 1879 V_state_change_timers_running = 1; 1880 } 1881 1882 /* We are in fasttimo, so be quick about it. */ 1883 if (!state_change_retransmit_timer_expired && 1884 !query_response_timer_expired) 1885 return; 1886 1887 switch (inm->inm_state) { 1888 case IGMP_NOT_MEMBER: 1889 case IGMP_SILENT_MEMBER: 1890 case IGMP_SLEEPING_MEMBER: 1891 case IGMP_LAZY_MEMBER: 1892 case IGMP_AWAKENING_MEMBER: 1893 case IGMP_IDLE_MEMBER: 1894 break; 1895 case IGMP_G_QUERY_PENDING_MEMBER: 1896 case IGMP_SG_QUERY_PENDING_MEMBER: 1897 /* 1898 * Respond to a previously pending Group-Specific 1899 * or Group-and-Source-Specific query by enqueueing 1900 * the appropriate Current-State report for 1901 * immediate transmission. 1902 */ 1903 if (query_response_timer_expired) { 1904 int retval __unused; 1905 1906 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1907 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1908 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1909 __func__, retval); 1910 inm->inm_state = IGMP_REPORTING_MEMBER; 1911 /* XXX Clear recorded sources for next time. */ 1912 inm_clear_recorded(inm); 1913 } 1914 /* FALLTHROUGH */ 1915 case IGMP_REPORTING_MEMBER: 1916 case IGMP_LEAVING_MEMBER: 1917 if (state_change_retransmit_timer_expired) { 1918 /* 1919 * State-change retransmission timer fired. 1920 * If there are any further pending retransmissions, 1921 * set the global pending state-change flag, and 1922 * reset the timer. 1923 */ 1924 if (--inm->inm_scrv > 0) { 1925 inm->inm_sctimer = uri_fasthz; 1926 V_state_change_timers_running = 1; 1927 } 1928 /* 1929 * Retransmit the previously computed state-change 1930 * report. If there are no further pending 1931 * retransmissions, the mbuf queue will be consumed. 1932 * Update T0 state to T1 as we have now sent 1933 * a state-change. 1934 */ 1935 (void)igmp_v3_merge_state_changes(inm, scq); 1936 1937 inm_commit(inm); 1938 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1939 ntohl(inm->inm_addr.s_addr), 1940 inm->inm_ifp->if_xname); 1941 1942 /* 1943 * If we are leaving the group for good, make sure 1944 * we release IGMP's reference to it. 1945 * This release must be deferred using a SLIST, 1946 * as we are called from a loop which traverses 1947 * the in_ifmultiaddr TAILQ. 1948 */ 1949 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1950 inm->inm_scrv == 0) { 1951 inm->inm_state = IGMP_NOT_MEMBER; 1952 inm_rele_locked(inmh, inm); 1953 } 1954 } 1955 break; 1956 } 1957 } 1958 1959 /* 1960 * Suppress a group's pending response to a group or source/group query. 1961 * 1962 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1963 * Do NOT update ST1/ST0 as this operation merely suppresses 1964 * the currently pending group record. 1965 * Do NOT suppress the response to a general query. It is possible but 1966 * it would require adding another state or flag. 1967 */ 1968 static void 1969 igmp_v3_suppress_group_record(struct in_multi *inm) 1970 { 1971 1972 IN_MULTI_LIST_LOCK_ASSERT(); 1973 1974 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1975 ("%s: not IGMPv3 mode on link", __func__)); 1976 1977 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1978 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1979 return; 1980 1981 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1982 inm_clear_recorded(inm); 1983 1984 inm->inm_timer = 0; 1985 inm->inm_state = IGMP_REPORTING_MEMBER; 1986 } 1987 1988 /* 1989 * Switch to a different IGMP version on the given interface, 1990 * as per Section 7.2.1. 1991 */ 1992 static void 1993 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1994 { 1995 int old_version_timer; 1996 1997 IGMP_LOCK_ASSERT(); 1998 1999 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 2000 version, igi->igi_ifp, igi->igi_ifp->if_xname); 2001 2002 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 2003 /* 2004 * Compute the "Older Version Querier Present" timer as per 2005 * Section 8.12. 2006 */ 2007 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 2008 old_version_timer *= PR_SLOWHZ; 2009 2010 if (version == IGMP_VERSION_1) { 2011 igi->igi_v1_timer = old_version_timer; 2012 igi->igi_v2_timer = 0; 2013 } else if (version == IGMP_VERSION_2) { 2014 igi->igi_v1_timer = 0; 2015 igi->igi_v2_timer = old_version_timer; 2016 } 2017 } 2018 2019 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2020 if (igi->igi_version != IGMP_VERSION_2) { 2021 igi->igi_version = IGMP_VERSION_2; 2022 igmp_v3_cancel_link_timers(igi); 2023 } 2024 } else if (igi->igi_v1_timer > 0) { 2025 if (igi->igi_version != IGMP_VERSION_1) { 2026 igi->igi_version = IGMP_VERSION_1; 2027 igmp_v3_cancel_link_timers(igi); 2028 } 2029 } 2030 } 2031 2032 /* 2033 * Cancel pending IGMPv3 timers for the given link and all groups 2034 * joined on it; state-change, general-query, and group-query timers. 2035 * 2036 * Only ever called on a transition from v3 to Compatibility mode. Kill 2037 * the timers stone dead (this may be expensive for large N groups), they 2038 * will be restarted if Compatibility Mode deems that they must be due to 2039 * query processing. 2040 */ 2041 static void 2042 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2043 { 2044 struct ifmultiaddr *ifma, *ifmatmp; 2045 struct ifnet *ifp; 2046 struct in_multi *inm; 2047 struct in_multi_head inm_free_tmp; 2048 2049 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2050 igi->igi_ifp, igi->igi_ifp->if_xname); 2051 2052 IN_MULTI_LIST_LOCK_ASSERT(); 2053 IGMP_LOCK_ASSERT(); 2054 NET_EPOCH_ASSERT(); 2055 2056 SLIST_INIT(&inm_free_tmp); 2057 2058 /* 2059 * Stop the v3 General Query Response on this link stone dead. 2060 * If fasttimo is woken up due to V_interface_timers_running, 2061 * the flag will be cleared if there are no pending link timers. 2062 */ 2063 igi->igi_v3_timer = 0; 2064 2065 /* 2066 * Now clear the current-state and state-change report timers 2067 * for all memberships scoped to this link. 2068 */ 2069 ifp = igi->igi_ifp; 2070 IF_ADDR_WLOCK(ifp); 2071 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, ifmatmp) { 2072 if (ifma->ifma_addr->sa_family != AF_INET || 2073 ifma->ifma_protospec == NULL) 2074 continue; 2075 inm = (struct in_multi *)ifma->ifma_protospec; 2076 switch (inm->inm_state) { 2077 case IGMP_NOT_MEMBER: 2078 case IGMP_SILENT_MEMBER: 2079 case IGMP_IDLE_MEMBER: 2080 case IGMP_LAZY_MEMBER: 2081 case IGMP_SLEEPING_MEMBER: 2082 case IGMP_AWAKENING_MEMBER: 2083 /* 2084 * These states are either not relevant in v3 mode, 2085 * or are unreported. Do nothing. 2086 */ 2087 break; 2088 case IGMP_LEAVING_MEMBER: 2089 /* 2090 * If we are leaving the group and switching to 2091 * compatibility mode, we need to release the final 2092 * reference held for issuing the INCLUDE {}, and 2093 * transition to REPORTING to ensure the host leave 2094 * message is sent upstream to the old querier -- 2095 * transition to NOT would lose the leave and race. 2096 */ 2097 inm_rele_locked(&inm_free_tmp, inm); 2098 /* FALLTHROUGH */ 2099 case IGMP_G_QUERY_PENDING_MEMBER: 2100 case IGMP_SG_QUERY_PENDING_MEMBER: 2101 inm_clear_recorded(inm); 2102 /* FALLTHROUGH */ 2103 case IGMP_REPORTING_MEMBER: 2104 inm->inm_state = IGMP_REPORTING_MEMBER; 2105 break; 2106 } 2107 /* 2108 * Always clear state-change and group report timers. 2109 * Free any pending IGMPv3 state-change records. 2110 */ 2111 inm->inm_sctimer = 0; 2112 inm->inm_timer = 0; 2113 mbufq_drain(&inm->inm_scq); 2114 } 2115 IF_ADDR_WUNLOCK(ifp); 2116 2117 inm_release_list_deferred(&inm_free_tmp); 2118 } 2119 2120 /* 2121 * Update the Older Version Querier Present timers for a link. 2122 * See Section 7.2.1 of RFC 3376. 2123 */ 2124 static void 2125 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2126 { 2127 2128 IGMP_LOCK_ASSERT(); 2129 2130 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2131 /* 2132 * IGMPv1 and IGMPv2 Querier Present timers expired. 2133 * 2134 * Revert to IGMPv3. 2135 */ 2136 if (igi->igi_version != IGMP_VERSION_3) { 2137 CTR5(KTR_IGMPV3, 2138 "%s: transition from v%d -> v%d on %p(%s)", 2139 __func__, igi->igi_version, IGMP_VERSION_3, 2140 igi->igi_ifp, igi->igi_ifp->if_xname); 2141 igi->igi_version = IGMP_VERSION_3; 2142 } 2143 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2144 /* 2145 * IGMPv1 Querier Present timer expired, 2146 * IGMPv2 Querier Present timer running. 2147 * If IGMPv2 was disabled since last timeout, 2148 * revert to IGMPv3. 2149 * If IGMPv2 is enabled, revert to IGMPv2. 2150 */ 2151 if (!V_igmp_v2enable) { 2152 CTR5(KTR_IGMPV3, 2153 "%s: transition from v%d -> v%d on %p(%s)", 2154 __func__, igi->igi_version, IGMP_VERSION_3, 2155 igi->igi_ifp, igi->igi_ifp->if_xname); 2156 igi->igi_v2_timer = 0; 2157 igi->igi_version = IGMP_VERSION_3; 2158 } else { 2159 --igi->igi_v2_timer; 2160 if (igi->igi_version != IGMP_VERSION_2) { 2161 CTR5(KTR_IGMPV3, 2162 "%s: transition from v%d -> v%d on %p(%s)", 2163 __func__, igi->igi_version, IGMP_VERSION_2, 2164 igi->igi_ifp, igi->igi_ifp->if_xname); 2165 igi->igi_version = IGMP_VERSION_2; 2166 igmp_v3_cancel_link_timers(igi); 2167 } 2168 } 2169 } else if (igi->igi_v1_timer > 0) { 2170 /* 2171 * IGMPv1 Querier Present timer running. 2172 * Stop IGMPv2 timer if running. 2173 * 2174 * If IGMPv1 was disabled since last timeout, 2175 * revert to IGMPv3. 2176 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2177 */ 2178 if (!V_igmp_v1enable) { 2179 CTR5(KTR_IGMPV3, 2180 "%s: transition from v%d -> v%d on %p(%s)", 2181 __func__, igi->igi_version, IGMP_VERSION_3, 2182 igi->igi_ifp, igi->igi_ifp->if_xname); 2183 igi->igi_v1_timer = 0; 2184 igi->igi_version = IGMP_VERSION_3; 2185 } else { 2186 --igi->igi_v1_timer; 2187 } 2188 if (igi->igi_v2_timer > 0) { 2189 CTR3(KTR_IGMPV3, 2190 "%s: cancel v2 timer on %p(%s)", 2191 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2192 igi->igi_v2_timer = 0; 2193 } 2194 } 2195 } 2196 2197 /* 2198 * Global slowtimo handler. 2199 * VIMAGE: Timeout handlers are expected to service all vimages. 2200 */ 2201 void 2202 igmp_slowtimo(void) 2203 { 2204 VNET_ITERATOR_DECL(vnet_iter); 2205 2206 VNET_LIST_RLOCK_NOSLEEP(); 2207 VNET_FOREACH(vnet_iter) { 2208 CURVNET_SET(vnet_iter); 2209 igmp_slowtimo_vnet(); 2210 CURVNET_RESTORE(); 2211 } 2212 VNET_LIST_RUNLOCK_NOSLEEP(); 2213 } 2214 2215 /* 2216 * Per-vnet slowtimo handler. 2217 */ 2218 static void 2219 igmp_slowtimo_vnet(void) 2220 { 2221 struct igmp_ifsoftc *igi; 2222 2223 IGMP_LOCK(); 2224 2225 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2226 igmp_v1v2_process_querier_timers(igi); 2227 } 2228 2229 IGMP_UNLOCK(); 2230 } 2231 2232 /* 2233 * Dispatch an IGMPv1/v2 host report or leave message. 2234 * These are always small enough to fit inside a single mbuf. 2235 */ 2236 static int 2237 igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2238 { 2239 struct epoch_tracker et; 2240 struct ifnet *ifp; 2241 struct igmp *igmp; 2242 struct ip *ip; 2243 struct mbuf *m; 2244 2245 IN_MULTI_LIST_LOCK_ASSERT(); 2246 IGMP_LOCK_ASSERT(); 2247 2248 ifp = inm->inm_ifp; 2249 2250 m = m_gethdr(M_NOWAIT, MT_DATA); 2251 if (m == NULL) 2252 return (ENOMEM); 2253 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2254 2255 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2256 2257 m->m_data += sizeof(struct ip); 2258 m->m_len = sizeof(struct igmp); 2259 2260 igmp = mtod(m, struct igmp *); 2261 igmp->igmp_type = type; 2262 igmp->igmp_code = 0; 2263 igmp->igmp_group = inm->inm_addr; 2264 igmp->igmp_cksum = 0; 2265 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2266 2267 m->m_data -= sizeof(struct ip); 2268 m->m_len += sizeof(struct ip); 2269 2270 ip = mtod(m, struct ip *); 2271 ip->ip_tos = 0; 2272 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2273 ip->ip_off = 0; 2274 ip->ip_p = IPPROTO_IGMP; 2275 ip->ip_src.s_addr = INADDR_ANY; 2276 2277 if (type == IGMP_HOST_LEAVE_MESSAGE) 2278 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2279 else 2280 ip->ip_dst = inm->inm_addr; 2281 2282 igmp_save_context(m, ifp); 2283 2284 m->m_flags |= M_IGMPV2; 2285 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2286 m->m_flags |= M_IGMP_LOOP; 2287 2288 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2289 NET_EPOCH_ENTER(et); 2290 netisr_dispatch(NETISR_IGMP, m); 2291 NET_EPOCH_EXIT(et); 2292 2293 return (0); 2294 } 2295 2296 /* 2297 * Process a state change from the upper layer for the given IPv4 group. 2298 * 2299 * Each socket holds a reference on the in_multi in its own ip_moptions. 2300 * The socket layer will have made the necessary updates to.the group 2301 * state, it is now up to IGMP to issue a state change report if there 2302 * has been any change between T0 (when the last state-change was issued) 2303 * and T1 (now). 2304 * 2305 * We use the IGMPv3 state machine at group level. The IGMP module 2306 * however makes the decision as to which IGMP protocol version to speak. 2307 * A state change *from* INCLUDE {} always means an initial join. 2308 * A state change *to* INCLUDE {} always means a final leave. 2309 * 2310 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2311 * save ourselves a bunch of work; any exclusive mode groups need not 2312 * compute source filter lists. 2313 * 2314 * VIMAGE: curvnet should have been set by caller, as this routine 2315 * is called from the socket option handlers. 2316 */ 2317 int 2318 igmp_change_state(struct in_multi *inm) 2319 { 2320 struct igmp_ifsoftc *igi; 2321 struct ifnet *ifp; 2322 int error; 2323 2324 error = 0; 2325 IN_MULTI_LOCK_ASSERT(); 2326 /* 2327 * Try to detect if the upper layer just asked us to change state 2328 * for an interface which has now gone away. 2329 */ 2330 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2331 ifp = inm->inm_ifma->ifma_ifp; 2332 /* 2333 * Sanity check that netinet's notion of ifp is the 2334 * same as net's. 2335 */ 2336 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2337 2338 IGMP_LOCK(); 2339 2340 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2341 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2342 2343 /* 2344 * If we detect a state transition to or from MCAST_UNDEFINED 2345 * for this group, then we are starting or finishing an IGMP 2346 * life cycle for this group. 2347 */ 2348 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2349 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2350 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2351 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2352 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2353 error = igmp_initial_join(inm, igi); 2354 goto out_locked; 2355 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2356 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2357 igmp_final_leave(inm, igi); 2358 goto out_locked; 2359 } 2360 } else { 2361 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2362 } 2363 2364 error = igmp_handle_state_change(inm, igi); 2365 2366 out_locked: 2367 IGMP_UNLOCK(); 2368 return (error); 2369 } 2370 2371 /* 2372 * Perform the initial join for an IGMP group. 2373 * 2374 * When joining a group: 2375 * If the group should have its IGMP traffic suppressed, do nothing. 2376 * IGMPv1 starts sending IGMPv1 host membership reports. 2377 * IGMPv2 starts sending IGMPv2 host membership reports. 2378 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2379 * initial state of the membership. 2380 */ 2381 static int 2382 igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2383 { 2384 struct ifnet *ifp; 2385 struct mbufq *mq; 2386 int error, retval, syncstates; 2387 2388 CTR4(KTR_IGMPV3, "%s: initial join 0x%08x on ifp %p(%s)", __func__, 2389 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2390 2391 error = 0; 2392 syncstates = 1; 2393 2394 ifp = inm->inm_ifp; 2395 2396 IN_MULTI_LOCK_ASSERT(); 2397 IGMP_LOCK_ASSERT(); 2398 2399 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2400 2401 /* 2402 * Groups joined on loopback or marked as 'not reported', 2403 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2404 * are never reported in any IGMP protocol exchanges. 2405 * All other groups enter the appropriate IGMP state machine 2406 * for the version in use on this link. 2407 * A link marked as IGIF_SILENT causes IGMP to be completely 2408 * disabled for the link. 2409 */ 2410 if ((ifp->if_flags & IFF_LOOPBACK) || 2411 (igi->igi_flags & IGIF_SILENT) || 2412 !igmp_isgroupreported(inm->inm_addr)) { 2413 CTR1(KTR_IGMPV3, 2414 "%s: not kicking state machine for silent group", __func__); 2415 inm->inm_state = IGMP_SILENT_MEMBER; 2416 inm->inm_timer = 0; 2417 } else { 2418 /* 2419 * Deal with overlapping in_multi lifecycle. 2420 * If this group was LEAVING, then make sure 2421 * we drop the reference we picked up to keep the 2422 * group around for the final INCLUDE {} enqueue. 2423 */ 2424 if (igi->igi_version == IGMP_VERSION_3 && 2425 inm->inm_state == IGMP_LEAVING_MEMBER) { 2426 MPASS(inm->inm_refcount > 1); 2427 inm_rele_locked(NULL, inm); 2428 } 2429 inm->inm_state = IGMP_REPORTING_MEMBER; 2430 2431 switch (igi->igi_version) { 2432 case IGMP_VERSION_1: 2433 case IGMP_VERSION_2: 2434 inm->inm_state = IGMP_IDLE_MEMBER; 2435 error = igmp_v1v2_queue_report(inm, 2436 (igi->igi_version == IGMP_VERSION_2) ? 2437 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2438 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2439 if (error == 0) { 2440 inm->inm_timer = IGMP_RANDOM_DELAY( 2441 IGMP_V1V2_MAX_RI * PR_FASTHZ); 2442 V_current_state_timers_running = 1; 2443 } 2444 break; 2445 2446 case IGMP_VERSION_3: 2447 /* 2448 * Defer update of T0 to T1, until the first copy 2449 * of the state change has been transmitted. 2450 */ 2451 syncstates = 0; 2452 2453 /* 2454 * Immediately enqueue a State-Change Report for 2455 * this interface, freeing any previous reports. 2456 * Don't kick the timers if there is nothing to do, 2457 * or if an error occurred. 2458 */ 2459 mq = &inm->inm_scq; 2460 mbufq_drain(mq); 2461 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2462 0, 0); 2463 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2464 __func__, retval); 2465 if (retval <= 0) { 2466 error = retval * -1; 2467 break; 2468 } 2469 2470 /* 2471 * Schedule transmission of pending state-change 2472 * report up to RV times for this link. The timer 2473 * will fire at the next igmp_fasttimo (~200ms), 2474 * giving us an opportunity to merge the reports. 2475 */ 2476 if (igi->igi_flags & IGIF_LOOPBACK) { 2477 inm->inm_scrv = 1; 2478 } else { 2479 KASSERT(igi->igi_rv > 1, 2480 ("%s: invalid robustness %d", __func__, 2481 igi->igi_rv)); 2482 inm->inm_scrv = igi->igi_rv; 2483 } 2484 inm->inm_sctimer = 1; 2485 V_state_change_timers_running = 1; 2486 2487 error = 0; 2488 break; 2489 } 2490 } 2491 2492 /* 2493 * Only update the T0 state if state change is atomic, 2494 * i.e. we don't need to wait for a timer to fire before we 2495 * can consider the state change to have been communicated. 2496 */ 2497 if (syncstates) { 2498 inm_commit(inm); 2499 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2500 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2501 } 2502 2503 return (error); 2504 } 2505 2506 /* 2507 * Issue an intermediate state change during the IGMP life-cycle. 2508 */ 2509 static int 2510 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2511 { 2512 struct ifnet *ifp; 2513 int retval; 2514 2515 CTR4(KTR_IGMPV3, "%s: state change for 0x%08x on ifp %p(%s)", __func__, 2516 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2517 2518 ifp = inm->inm_ifp; 2519 2520 IN_MULTI_LIST_LOCK_ASSERT(); 2521 IGMP_LOCK_ASSERT(); 2522 2523 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2524 2525 if ((ifp->if_flags & IFF_LOOPBACK) || 2526 (igi->igi_flags & IGIF_SILENT) || 2527 !igmp_isgroupreported(inm->inm_addr) || 2528 (igi->igi_version != IGMP_VERSION_3)) { 2529 if (!igmp_isgroupreported(inm->inm_addr)) { 2530 CTR1(KTR_IGMPV3, 2531 "%s: not kicking state machine for silent group", __func__); 2532 } 2533 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2534 inm_commit(inm); 2535 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2536 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2537 return (0); 2538 } 2539 2540 mbufq_drain(&inm->inm_scq); 2541 2542 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2543 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2544 if (retval <= 0) 2545 return (-retval); 2546 2547 /* 2548 * If record(s) were enqueued, start the state-change 2549 * report timer for this group. 2550 */ 2551 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2552 inm->inm_sctimer = 1; 2553 V_state_change_timers_running = 1; 2554 2555 return (0); 2556 } 2557 2558 /* 2559 * Perform the final leave for an IGMP group. 2560 * 2561 * When leaving a group: 2562 * IGMPv1 does nothing. 2563 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2564 * IGMPv3 enqueues a state-change report containing a transition 2565 * to INCLUDE {} for immediate transmission. 2566 */ 2567 static void 2568 igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2569 { 2570 int syncstates; 2571 2572 syncstates = 1; 2573 2574 CTR4(KTR_IGMPV3, "%s: final leave 0x%08x on ifp %p(%s)", 2575 __func__, ntohl(inm->inm_addr.s_addr), inm->inm_ifp, 2576 inm->inm_ifp->if_xname); 2577 2578 IN_MULTI_LIST_LOCK_ASSERT(); 2579 IGMP_LOCK_ASSERT(); 2580 2581 switch (inm->inm_state) { 2582 case IGMP_NOT_MEMBER: 2583 case IGMP_SILENT_MEMBER: 2584 case IGMP_LEAVING_MEMBER: 2585 /* Already leaving or left; do nothing. */ 2586 CTR1(KTR_IGMPV3, 2587 "%s: not kicking state machine for silent group", __func__); 2588 break; 2589 case IGMP_REPORTING_MEMBER: 2590 case IGMP_IDLE_MEMBER: 2591 case IGMP_G_QUERY_PENDING_MEMBER: 2592 case IGMP_SG_QUERY_PENDING_MEMBER: 2593 if (igi->igi_version == IGMP_VERSION_2) { 2594 #ifdef INVARIANTS 2595 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2596 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2597 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2598 __func__); 2599 #endif 2600 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2601 inm->inm_state = IGMP_NOT_MEMBER; 2602 } else if (igi->igi_version == IGMP_VERSION_3) { 2603 /* 2604 * Stop group timer and all pending reports. 2605 * Immediately enqueue a state-change report 2606 * TO_IN {} to be sent on the next fast timeout, 2607 * giving us an opportunity to merge reports. 2608 */ 2609 mbufq_drain(&inm->inm_scq); 2610 inm->inm_timer = 0; 2611 if (igi->igi_flags & IGIF_LOOPBACK) { 2612 inm->inm_scrv = 1; 2613 } else { 2614 inm->inm_scrv = igi->igi_rv; 2615 } 2616 CTR4(KTR_IGMPV3, "%s: Leaving 0x%08x/%s with %d " 2617 "pending retransmissions.", __func__, 2618 ntohl(inm->inm_addr.s_addr), 2619 inm->inm_ifp->if_xname, inm->inm_scrv); 2620 if (inm->inm_scrv == 0) { 2621 inm->inm_state = IGMP_NOT_MEMBER; 2622 inm->inm_sctimer = 0; 2623 } else { 2624 int retval __unused; 2625 2626 inm_acquire_locked(inm); 2627 2628 retval = igmp_v3_enqueue_group_record( 2629 &inm->inm_scq, inm, 1, 0, 0); 2630 KASSERT(retval != 0, 2631 ("%s: enqueue record = %d", __func__, 2632 retval)); 2633 2634 inm->inm_state = IGMP_LEAVING_MEMBER; 2635 inm->inm_sctimer = 1; 2636 V_state_change_timers_running = 1; 2637 syncstates = 0; 2638 } 2639 break; 2640 } 2641 break; 2642 case IGMP_LAZY_MEMBER: 2643 case IGMP_SLEEPING_MEMBER: 2644 case IGMP_AWAKENING_MEMBER: 2645 /* Our reports are suppressed; do nothing. */ 2646 break; 2647 } 2648 2649 if (syncstates) { 2650 inm_commit(inm); 2651 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2652 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2653 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2654 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for 0x%08x/%s", 2655 __func__, ntohl(inm->inm_addr.s_addr), 2656 inm->inm_ifp->if_xname); 2657 } 2658 } 2659 2660 /* 2661 * Enqueue an IGMPv3 group record to the given output queue. 2662 * 2663 * XXX This function could do with having the allocation code 2664 * split out, and the multiple-tree-walks coalesced into a single 2665 * routine as has been done in igmp_v3_enqueue_filter_change(). 2666 * 2667 * If is_state_change is zero, a current-state record is appended. 2668 * If is_state_change is non-zero, a state-change report is appended. 2669 * 2670 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2671 * If is_group_query is zero, and if there is a packet with free space 2672 * at the tail of the queue, it will be appended to providing there 2673 * is enough free space. 2674 * Otherwise a new mbuf packet chain is allocated. 2675 * 2676 * If is_source_query is non-zero, each source is checked to see if 2677 * it was recorded for a Group-Source query, and will be omitted if 2678 * it is not both in-mode and recorded. 2679 * 2680 * The function will attempt to allocate leading space in the packet 2681 * for the IP/IGMP header to be prepended without fragmenting the chain. 2682 * 2683 * If successful the size of all data appended to the queue is returned, 2684 * otherwise an error code less than zero is returned, or zero if 2685 * no record(s) were appended. 2686 */ 2687 static int 2688 igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2689 const int is_state_change, const int is_group_query, 2690 const int is_source_query) 2691 { 2692 struct igmp_grouprec ig; 2693 struct igmp_grouprec *pig; 2694 struct ifnet *ifp; 2695 struct ip_msource *ims, *nims; 2696 struct mbuf *m0, *m, *md; 2697 int is_filter_list_change; 2698 int minrec0len, m0srcs, msrcs, nbytes, off; 2699 int record_has_sources; 2700 int now; 2701 int type; 2702 in_addr_t naddr; 2703 uint8_t mode; 2704 2705 IN_MULTI_LIST_LOCK_ASSERT(); 2706 2707 ifp = inm->inm_ifp; 2708 is_filter_list_change = 0; 2709 m = NULL; 2710 m0 = NULL; 2711 m0srcs = 0; 2712 msrcs = 0; 2713 nbytes = 0; 2714 nims = NULL; 2715 record_has_sources = 1; 2716 pig = NULL; 2717 type = IGMP_DO_NOTHING; 2718 mode = inm->inm_st[1].iss_fmode; 2719 2720 /* 2721 * If we did not transition out of ASM mode during t0->t1, 2722 * and there are no source nodes to process, we can skip 2723 * the generation of source records. 2724 */ 2725 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2726 inm->inm_nsrc == 0) 2727 record_has_sources = 0; 2728 2729 if (is_state_change) { 2730 /* 2731 * Queue a state change record. 2732 * If the mode did not change, and there are non-ASM 2733 * listeners or source filters present, 2734 * we potentially need to issue two records for the group. 2735 * If we are transitioning to MCAST_UNDEFINED, we need 2736 * not send any sources. 2737 * If there are ASM listeners, and there was no filter 2738 * mode transition of any kind, do nothing. 2739 */ 2740 if (mode != inm->inm_st[0].iss_fmode) { 2741 if (mode == MCAST_EXCLUDE) { 2742 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2743 __func__); 2744 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2745 } else { 2746 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2747 __func__); 2748 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2749 if (mode == MCAST_UNDEFINED) 2750 record_has_sources = 0; 2751 } 2752 } else { 2753 if (record_has_sources) { 2754 is_filter_list_change = 1; 2755 } else { 2756 type = IGMP_DO_NOTHING; 2757 } 2758 } 2759 } else { 2760 /* 2761 * Queue a current state record. 2762 */ 2763 if (mode == MCAST_EXCLUDE) { 2764 type = IGMP_MODE_IS_EXCLUDE; 2765 } else if (mode == MCAST_INCLUDE) { 2766 type = IGMP_MODE_IS_INCLUDE; 2767 KASSERT(inm->inm_st[1].iss_asm == 0, 2768 ("%s: inm %p is INCLUDE but ASM count is %d", 2769 __func__, inm, inm->inm_st[1].iss_asm)); 2770 } 2771 } 2772 2773 /* 2774 * Generate the filter list changes using a separate function. 2775 */ 2776 if (is_filter_list_change) 2777 return (igmp_v3_enqueue_filter_change(mq, inm)); 2778 2779 if (type == IGMP_DO_NOTHING) { 2780 CTR3(KTR_IGMPV3, "%s: nothing to do for 0x%08x/%s", __func__, 2781 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2782 return (0); 2783 } 2784 2785 /* 2786 * If any sources are present, we must be able to fit at least 2787 * one in the trailing space of the tail packet's mbuf, 2788 * ideally more. 2789 */ 2790 minrec0len = sizeof(struct igmp_grouprec); 2791 if (record_has_sources) 2792 minrec0len += sizeof(in_addr_t); 2793 2794 CTR4(KTR_IGMPV3, "%s: queueing %s for 0x%08x/%s", __func__, 2795 igmp_rec_type_to_str(type), ntohl(inm->inm_addr.s_addr), 2796 inm->inm_ifp->if_xname); 2797 2798 /* 2799 * Check if we have a packet in the tail of the queue for this 2800 * group into which the first group record for this group will fit. 2801 * Otherwise allocate a new packet. 2802 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2803 * Note: Group records for G/GSR query responses MUST be sent 2804 * in their own packet. 2805 */ 2806 m0 = mbufq_last(mq); 2807 if (!is_group_query && 2808 m0 != NULL && 2809 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2810 (m0->m_pkthdr.len + minrec0len) < 2811 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2812 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2813 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2814 m = m0; 2815 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2816 } else { 2817 if (mbufq_full(mq)) { 2818 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2819 return (-ENOMEM); 2820 } 2821 m = NULL; 2822 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2823 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2824 if (!is_state_change && !is_group_query) { 2825 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2826 if (m) 2827 m->m_data += IGMP_LEADINGSPACE; 2828 } 2829 if (m == NULL) { 2830 m = m_gethdr(M_NOWAIT, MT_DATA); 2831 if (m) 2832 M_ALIGN(m, IGMP_LEADINGSPACE); 2833 } 2834 if (m == NULL) 2835 return (-ENOMEM); 2836 2837 igmp_save_context(m, ifp); 2838 2839 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2840 } 2841 2842 /* 2843 * Append group record. 2844 * If we have sources, we don't know how many yet. 2845 */ 2846 ig.ig_type = type; 2847 ig.ig_datalen = 0; 2848 ig.ig_numsrc = 0; 2849 ig.ig_group = inm->inm_addr; 2850 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2851 if (m != m0) 2852 m_freem(m); 2853 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2854 return (-ENOMEM); 2855 } 2856 nbytes += sizeof(struct igmp_grouprec); 2857 2858 /* 2859 * Append as many sources as will fit in the first packet. 2860 * If we are appending to a new packet, the chain allocation 2861 * may potentially use clusters; use m_getptr() in this case. 2862 * If we are appending to an existing packet, we need to obtain 2863 * a pointer to the group record after m_append(), in case a new 2864 * mbuf was allocated. 2865 * Only append sources which are in-mode at t1. If we are 2866 * transitioning to MCAST_UNDEFINED state on the group, do not 2867 * include source entries. 2868 * Only report recorded sources in our filter set when responding 2869 * to a group-source query. 2870 */ 2871 if (record_has_sources) { 2872 if (m == m0) { 2873 md = m_last(m); 2874 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2875 md->m_len - nbytes); 2876 } else { 2877 md = m_getptr(m, 0, &off); 2878 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2879 off); 2880 } 2881 msrcs = 0; 2882 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2883 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2884 ims->ims_haddr); 2885 now = ims_get_mode(inm, ims, 1); 2886 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2887 if ((now != mode) || 2888 (now == mode && mode == MCAST_UNDEFINED)) { 2889 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2890 continue; 2891 } 2892 if (is_source_query && ims->ims_stp == 0) { 2893 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2894 __func__); 2895 continue; 2896 } 2897 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2898 naddr = htonl(ims->ims_haddr); 2899 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2900 if (m != m0) 2901 m_freem(m); 2902 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2903 __func__); 2904 return (-ENOMEM); 2905 } 2906 nbytes += sizeof(in_addr_t); 2907 ++msrcs; 2908 if (msrcs == m0srcs) 2909 break; 2910 } 2911 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2912 msrcs); 2913 pig->ig_numsrc = htons(msrcs); 2914 nbytes += (msrcs * sizeof(in_addr_t)); 2915 } 2916 2917 if (is_source_query && msrcs == 0) { 2918 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2919 if (m != m0) 2920 m_freem(m); 2921 return (0); 2922 } 2923 2924 /* 2925 * We are good to go with first packet. 2926 */ 2927 if (m != m0) { 2928 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2929 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2930 mbufq_enqueue(mq, m); 2931 } else 2932 m->m_pkthdr.PH_vt.vt_nrecs++; 2933 2934 /* 2935 * No further work needed if no source list in packet(s). 2936 */ 2937 if (!record_has_sources) 2938 return (nbytes); 2939 2940 /* 2941 * Whilst sources remain to be announced, we need to allocate 2942 * a new packet and fill out as many sources as will fit. 2943 * Always try for a cluster first. 2944 */ 2945 while (nims != NULL) { 2946 if (mbufq_full(mq)) { 2947 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2948 return (-ENOMEM); 2949 } 2950 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2951 if (m) 2952 m->m_data += IGMP_LEADINGSPACE; 2953 if (m == NULL) { 2954 m = m_gethdr(M_NOWAIT, MT_DATA); 2955 if (m) 2956 M_ALIGN(m, IGMP_LEADINGSPACE); 2957 } 2958 if (m == NULL) 2959 return (-ENOMEM); 2960 igmp_save_context(m, ifp); 2961 md = m_getptr(m, 0, &off); 2962 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2963 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2964 2965 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2966 if (m != m0) 2967 m_freem(m); 2968 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2969 return (-ENOMEM); 2970 } 2971 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2972 nbytes += sizeof(struct igmp_grouprec); 2973 2974 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2975 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2976 2977 msrcs = 0; 2978 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2979 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2980 ims->ims_haddr); 2981 now = ims_get_mode(inm, ims, 1); 2982 if ((now != mode) || 2983 (now == mode && mode == MCAST_UNDEFINED)) { 2984 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2985 continue; 2986 } 2987 if (is_source_query && ims->ims_stp == 0) { 2988 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2989 __func__); 2990 continue; 2991 } 2992 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2993 naddr = htonl(ims->ims_haddr); 2994 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2995 if (m != m0) 2996 m_freem(m); 2997 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2998 __func__); 2999 return (-ENOMEM); 3000 } 3001 ++msrcs; 3002 if (msrcs == m0srcs) 3003 break; 3004 } 3005 pig->ig_numsrc = htons(msrcs); 3006 nbytes += (msrcs * sizeof(in_addr_t)); 3007 3008 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 3009 mbufq_enqueue(mq, m); 3010 } 3011 3012 return (nbytes); 3013 } 3014 3015 /* 3016 * Type used to mark record pass completion. 3017 * We exploit the fact we can cast to this easily from the 3018 * current filter modes on each ip_msource node. 3019 */ 3020 typedef enum { 3021 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 3022 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 3023 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 3024 REC_FULL = REC_ALLOW | REC_BLOCK 3025 } rectype_t; 3026 3027 /* 3028 * Enqueue an IGMPv3 filter list change to the given output queue. 3029 * 3030 * Source list filter state is held in an RB-tree. When the filter list 3031 * for a group is changed without changing its mode, we need to compute 3032 * the deltas between T0 and T1 for each source in the filter set, 3033 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 3034 * 3035 * As we may potentially queue two record types, and the entire R-B tree 3036 * needs to be walked at once, we break this out into its own function 3037 * so we can generate a tightly packed queue of packets. 3038 * 3039 * XXX This could be written to only use one tree walk, although that makes 3040 * serializing into the mbuf chains a bit harder. For now we do two walks 3041 * which makes things easier on us, and it may or may not be harder on 3042 * the L2 cache. 3043 * 3044 * If successful the size of all data appended to the queue is returned, 3045 * otherwise an error code less than zero is returned, or zero if 3046 * no record(s) were appended. 3047 */ 3048 static int 3049 igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3050 { 3051 static const int MINRECLEN = 3052 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3053 struct ifnet *ifp; 3054 struct igmp_grouprec ig; 3055 struct igmp_grouprec *pig; 3056 struct ip_msource *ims, *nims; 3057 struct mbuf *m, *m0, *md; 3058 in_addr_t naddr; 3059 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3060 int nallow, nblock; 3061 uint8_t mode, now, then; 3062 rectype_t crt, drt, nrt; 3063 3064 IN_MULTI_LIST_LOCK_ASSERT(); 3065 3066 if (inm->inm_nsrc == 0 || 3067 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3068 return (0); 3069 3070 ifp = inm->inm_ifp; /* interface */ 3071 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3072 crt = REC_NONE; /* current group record type */ 3073 drt = REC_NONE; /* mask of completed group record types */ 3074 nrt = REC_NONE; /* record type for current node */ 3075 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3076 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3077 npbytes = 0; /* # of bytes appended this packet */ 3078 rsrcs = 0; /* # sources encoded in current record */ 3079 schanged = 0; /* # nodes encoded in overall filter change */ 3080 nallow = 0; /* # of source entries in ALLOW_NEW */ 3081 nblock = 0; /* # of source entries in BLOCK_OLD */ 3082 nims = NULL; /* next tree node pointer */ 3083 3084 /* 3085 * For each possible filter record mode. 3086 * The first kind of source we encounter tells us which 3087 * is the first kind of record we start appending. 3088 * If a node transitioned to UNDEFINED at t1, its mode is treated 3089 * as the inverse of the group's filter mode. 3090 */ 3091 while (drt != REC_FULL) { 3092 do { 3093 m0 = mbufq_last(mq); 3094 if (m0 != NULL && 3095 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= 3096 IGMP_V3_REPORT_MAXRECS) && 3097 (m0->m_pkthdr.len + MINRECLEN) < 3098 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3099 m = m0; 3100 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3101 sizeof(struct igmp_grouprec)) / 3102 sizeof(in_addr_t); 3103 CTR1(KTR_IGMPV3, 3104 "%s: use previous packet", __func__); 3105 } else { 3106 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3107 if (m) 3108 m->m_data += IGMP_LEADINGSPACE; 3109 if (m == NULL) { 3110 m = m_gethdr(M_NOWAIT, MT_DATA); 3111 if (m) 3112 M_ALIGN(m, IGMP_LEADINGSPACE); 3113 } 3114 if (m == NULL) { 3115 CTR1(KTR_IGMPV3, 3116 "%s: m_get*() failed", __func__); 3117 return (-ENOMEM); 3118 } 3119 m->m_pkthdr.PH_vt.vt_nrecs = 0; 3120 igmp_save_context(m, ifp); 3121 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3122 sizeof(struct igmp_grouprec)) / 3123 sizeof(in_addr_t); 3124 npbytes = 0; 3125 CTR1(KTR_IGMPV3, 3126 "%s: allocated new packet", __func__); 3127 } 3128 /* 3129 * Append the IGMP group record header to the 3130 * current packet's data area. 3131 * Recalculate pointer to free space for next 3132 * group record, in case m_append() allocated 3133 * a new mbuf or cluster. 3134 */ 3135 memset(&ig, 0, sizeof(ig)); 3136 ig.ig_group = inm->inm_addr; 3137 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3138 if (m != m0) 3139 m_freem(m); 3140 CTR1(KTR_IGMPV3, 3141 "%s: m_append() failed", __func__); 3142 return (-ENOMEM); 3143 } 3144 npbytes += sizeof(struct igmp_grouprec); 3145 if (m != m0) { 3146 /* new packet; offset in c hain */ 3147 md = m_getptr(m, npbytes - 3148 sizeof(struct igmp_grouprec), &off); 3149 pig = (struct igmp_grouprec *)(mtod(md, 3150 uint8_t *) + off); 3151 } else { 3152 /* current packet; offset from last append */ 3153 md = m_last(m); 3154 pig = (struct igmp_grouprec *)(mtod(md, 3155 uint8_t *) + md->m_len - 3156 sizeof(struct igmp_grouprec)); 3157 } 3158 /* 3159 * Begin walking the tree for this record type 3160 * pass, or continue from where we left off 3161 * previously if we had to allocate a new packet. 3162 * Only report deltas in-mode at t1. 3163 * We need not report included sources as allowed 3164 * if we are in inclusive mode on the group, 3165 * however the converse is not true. 3166 */ 3167 rsrcs = 0; 3168 if (nims == NULL) 3169 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3170 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3171 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", 3172 __func__, ims->ims_haddr); 3173 now = ims_get_mode(inm, ims, 1); 3174 then = ims_get_mode(inm, ims, 0); 3175 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3176 __func__, then, now); 3177 if (now == then) { 3178 CTR1(KTR_IGMPV3, 3179 "%s: skip unchanged", __func__); 3180 continue; 3181 } 3182 if (mode == MCAST_EXCLUDE && 3183 now == MCAST_INCLUDE) { 3184 CTR1(KTR_IGMPV3, 3185 "%s: skip IN src on EX group", 3186 __func__); 3187 continue; 3188 } 3189 nrt = (rectype_t)now; 3190 if (nrt == REC_NONE) 3191 nrt = (rectype_t)(~mode & REC_FULL); 3192 if (schanged++ == 0) { 3193 crt = nrt; 3194 } else if (crt != nrt) 3195 continue; 3196 naddr = htonl(ims->ims_haddr); 3197 if (!m_append(m, sizeof(in_addr_t), 3198 (void *)&naddr)) { 3199 if (m != m0) 3200 m_freem(m); 3201 CTR1(KTR_IGMPV3, 3202 "%s: m_append() failed", __func__); 3203 return (-ENOMEM); 3204 } 3205 nallow += !!(crt == REC_ALLOW); 3206 nblock += !!(crt == REC_BLOCK); 3207 if (++rsrcs == m0srcs) 3208 break; 3209 } 3210 /* 3211 * If we did not append any tree nodes on this 3212 * pass, back out of allocations. 3213 */ 3214 if (rsrcs == 0) { 3215 npbytes -= sizeof(struct igmp_grouprec); 3216 if (m != m0) { 3217 CTR1(KTR_IGMPV3, 3218 "%s: m_free(m)", __func__); 3219 m_freem(m); 3220 } else { 3221 CTR1(KTR_IGMPV3, 3222 "%s: m_adj(m, -ig)", __func__); 3223 m_adj(m, -((int)sizeof( 3224 struct igmp_grouprec))); 3225 } 3226 continue; 3227 } 3228 npbytes += (rsrcs * sizeof(in_addr_t)); 3229 if (crt == REC_ALLOW) 3230 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3231 else if (crt == REC_BLOCK) 3232 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3233 pig->ig_numsrc = htons(rsrcs); 3234 /* 3235 * Count the new group record, and enqueue this 3236 * packet if it wasn't already queued. 3237 */ 3238 m->m_pkthdr.PH_vt.vt_nrecs++; 3239 if (m != m0) 3240 mbufq_enqueue(mq, m); 3241 nbytes += npbytes; 3242 } while (nims != NULL); 3243 drt |= crt; 3244 crt = (~crt & REC_FULL); 3245 } 3246 3247 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3248 nallow, nblock); 3249 3250 return (nbytes); 3251 } 3252 3253 static int 3254 igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3255 { 3256 struct mbufq *gq; 3257 struct mbuf *m; /* pending state-change */ 3258 struct mbuf *m0; /* copy of pending state-change */ 3259 struct mbuf *mt; /* last state-change in packet */ 3260 int docopy, domerge; 3261 u_int recslen; 3262 3263 docopy = 0; 3264 domerge = 0; 3265 recslen = 0; 3266 3267 IN_MULTI_LIST_LOCK_ASSERT(); 3268 IGMP_LOCK_ASSERT(); 3269 3270 /* 3271 * If there are further pending retransmissions, make a writable 3272 * copy of each queued state-change message before merging. 3273 */ 3274 if (inm->inm_scrv > 0) 3275 docopy = 1; 3276 3277 gq = &inm->inm_scq; 3278 #ifdef KTR 3279 if (mbufq_first(gq) == NULL) { 3280 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3281 __func__, inm); 3282 } 3283 #endif 3284 3285 m = mbufq_first(gq); 3286 while (m != NULL) { 3287 /* 3288 * Only merge the report into the current packet if 3289 * there is sufficient space to do so; an IGMPv3 report 3290 * packet may only contain 65,535 group records. 3291 * Always use a simple mbuf chain concatentation to do this, 3292 * as large state changes for single groups may have 3293 * allocated clusters. 3294 */ 3295 domerge = 0; 3296 mt = mbufq_last(scq); 3297 if (mt != NULL) { 3298 recslen = m_length(m, NULL); 3299 3300 if ((mt->m_pkthdr.PH_vt.vt_nrecs + 3301 m->m_pkthdr.PH_vt.vt_nrecs <= 3302 IGMP_V3_REPORT_MAXRECS) && 3303 (mt->m_pkthdr.len + recslen <= 3304 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3305 domerge = 1; 3306 } 3307 3308 if (!domerge && mbufq_full(gq)) { 3309 CTR2(KTR_IGMPV3, 3310 "%s: outbound queue full, skipping whole packet %p", 3311 __func__, m); 3312 mt = m->m_nextpkt; 3313 if (!docopy) 3314 m_freem(m); 3315 m = mt; 3316 continue; 3317 } 3318 3319 if (!docopy) { 3320 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3321 m0 = mbufq_dequeue(gq); 3322 m = m0->m_nextpkt; 3323 } else { 3324 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3325 m0 = m_dup(m, M_NOWAIT); 3326 if (m0 == NULL) 3327 return (ENOMEM); 3328 m0->m_nextpkt = NULL; 3329 m = m->m_nextpkt; 3330 } 3331 3332 if (!domerge) { 3333 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3334 __func__, m0, scq); 3335 mbufq_enqueue(scq, m0); 3336 } else { 3337 struct mbuf *mtl; /* last mbuf of packet mt */ 3338 3339 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3340 __func__, m0, mt); 3341 3342 mtl = m_last(mt); 3343 m0->m_flags &= ~M_PKTHDR; 3344 mt->m_pkthdr.len += recslen; 3345 mt->m_pkthdr.PH_vt.vt_nrecs += 3346 m0->m_pkthdr.PH_vt.vt_nrecs; 3347 3348 mtl->m_next = m0; 3349 } 3350 } 3351 3352 return (0); 3353 } 3354 3355 /* 3356 * Respond to a pending IGMPv3 General Query. 3357 */ 3358 static void 3359 igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3360 { 3361 struct ifmultiaddr *ifma; 3362 struct ifnet *ifp; 3363 struct in_multi *inm; 3364 int retval __unused, loop; 3365 3366 IN_MULTI_LIST_LOCK_ASSERT(); 3367 IGMP_LOCK_ASSERT(); 3368 NET_EPOCH_ASSERT(); 3369 3370 KASSERT(igi->igi_version == IGMP_VERSION_3, 3371 ("%s: called when version %d", __func__, igi->igi_version)); 3372 3373 /* 3374 * Check that there are some packets queued. If so, send them first. 3375 * For large number of groups the reply to general query can take 3376 * many packets, we should finish sending them before starting of 3377 * queuing the new reply. 3378 */ 3379 if (mbufq_len(&igi->igi_gq) != 0) 3380 goto send; 3381 3382 ifp = igi->igi_ifp; 3383 3384 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3385 if (ifma->ifma_addr->sa_family != AF_INET || 3386 ifma->ifma_protospec == NULL) 3387 continue; 3388 3389 inm = (struct in_multi *)ifma->ifma_protospec; 3390 KASSERT(ifp == inm->inm_ifp, 3391 ("%s: inconsistent ifp", __func__)); 3392 3393 switch (inm->inm_state) { 3394 case IGMP_NOT_MEMBER: 3395 case IGMP_SILENT_MEMBER: 3396 break; 3397 case IGMP_REPORTING_MEMBER: 3398 case IGMP_IDLE_MEMBER: 3399 case IGMP_LAZY_MEMBER: 3400 case IGMP_SLEEPING_MEMBER: 3401 case IGMP_AWAKENING_MEMBER: 3402 inm->inm_state = IGMP_REPORTING_MEMBER; 3403 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3404 inm, 0, 0, 0); 3405 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3406 __func__, retval); 3407 break; 3408 case IGMP_G_QUERY_PENDING_MEMBER: 3409 case IGMP_SG_QUERY_PENDING_MEMBER: 3410 case IGMP_LEAVING_MEMBER: 3411 break; 3412 } 3413 } 3414 3415 send: 3416 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3417 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3418 3419 /* 3420 * Slew transmission of bursts over 500ms intervals. 3421 */ 3422 if (mbufq_first(&igi->igi_gq) != NULL) { 3423 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3424 IGMP_RESPONSE_BURST_INTERVAL); 3425 V_interface_timers_running = 1; 3426 } 3427 } 3428 3429 /* 3430 * Transmit the next pending IGMP message in the output queue. 3431 * 3432 * We get called from netisr_processqueue(). A mutex private to igmpoq 3433 * will be acquired and released around this routine. 3434 * 3435 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3436 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3437 * a link and uses a link-scope multicast address. 3438 */ 3439 static void 3440 igmp_intr(struct mbuf *m) 3441 { 3442 struct ip_moptions imo; 3443 struct ifnet *ifp; 3444 struct mbuf *ipopts, *m0; 3445 int error; 3446 uint32_t ifindex; 3447 3448 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3449 3450 /* 3451 * Set VNET image pointer from enqueued mbuf chain 3452 * before doing anything else. Whilst we use interface 3453 * indexes to guard against interface detach, they are 3454 * unique to each VIMAGE and must be retrieved. 3455 */ 3456 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3457 ifindex = igmp_restore_context(m); 3458 3459 /* 3460 * Check if the ifnet still exists. This limits the scope of 3461 * any race in the absence of a global ifp lock for low cost 3462 * (an array lookup). 3463 */ 3464 ifp = ifnet_byindex(ifindex); 3465 if (ifp == NULL) { 3466 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3467 __func__, m, ifindex); 3468 m_freem(m); 3469 IPSTAT_INC(ips_noroute); 3470 goto out; 3471 } 3472 3473 ipopts = V_igmp_sendra ? m_raopt : NULL; 3474 3475 imo.imo_multicast_ttl = 1; 3476 imo.imo_multicast_vif = -1; 3477 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3478 3479 /* 3480 * If the user requested that IGMP traffic be explicitly 3481 * redirected to the loopback interface (e.g. they are running a 3482 * MANET interface and the routing protocol needs to see the 3483 * updates), handle this now. 3484 */ 3485 if (m->m_flags & M_IGMP_LOOP) 3486 imo.imo_multicast_ifp = V_loif; 3487 else 3488 imo.imo_multicast_ifp = ifp; 3489 3490 if (m->m_flags & M_IGMPV2) { 3491 m0 = m; 3492 } else { 3493 m0 = igmp_v3_encap_report(ifp, m); 3494 if (m0 == NULL) { 3495 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3496 m_freem(m); 3497 IPSTAT_INC(ips_odropped); 3498 goto out; 3499 } 3500 } 3501 3502 igmp_scrub_context(m0); 3503 m_clrprotoflags(m); 3504 m0->m_pkthdr.rcvif = V_loif; 3505 #ifdef MAC 3506 mac_netinet_igmp_send(ifp, m0); 3507 #endif 3508 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3509 if (error) { 3510 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3511 goto out; 3512 } 3513 3514 IGMPSTAT_INC(igps_snd_reports); 3515 3516 out: 3517 /* 3518 * We must restore the existing vnet pointer before 3519 * continuing as we are run from netisr context. 3520 */ 3521 CURVNET_RESTORE(); 3522 } 3523 3524 /* 3525 * Encapsulate an IGMPv3 report. 3526 * 3527 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3528 * chain has already had its IP/IGMPv3 header prepended. In this case 3529 * the function will not attempt to prepend; the lengths and checksums 3530 * will however be re-computed. 3531 * 3532 * Returns a pointer to the new mbuf chain head, or NULL if the 3533 * allocation failed. 3534 */ 3535 static struct mbuf * 3536 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3537 { 3538 struct rm_priotracker in_ifa_tracker; 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.PH_vt.vt_nrecs); 3568 igmp->ir_cksum = 0; 3569 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3570 m->m_pkthdr.PH_vt.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, &in_ifa_tracker); 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