1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2007-2009 Bruce Simpson. 5 * Copyright (c) 1988 Stephen Deering. 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Stephen Deering of Stanford University. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)igmp.c 8.1 (Berkeley) 7/19/93 37 */ 38 39 /* 40 * Internet Group Management Protocol (IGMP) routines. 41 * [RFC1112, RFC2236, RFC3376] 42 * 43 * Written by Steve Deering, Stanford, May 1988. 44 * Modified by Rosen Sharma, Stanford, Aug 1994. 45 * Modified by Bill Fenner, Xerox PARC, Feb 1995. 46 * Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995. 47 * Significantly rewritten for IGMPv3, VIMAGE, and SMP by Bruce Simpson. 48 * 49 * MULTICAST Revision: 3.5.1.4 50 */ 51 52 #include <sys/cdefs.h> 53 __FBSDID("$FreeBSD$"); 54 55 #include "opt_ddb.h" 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/module.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/socket.h> 63 #include <sys/protosw.h> 64 #include <sys/kernel.h> 65 #include <sys/lock.h> 66 #include <sys/sysctl.h> 67 #include <sys/ktr.h> 68 #include <sys/condvar.h> 69 70 #ifdef DDB 71 #include <ddb/ddb.h> 72 #endif 73 74 #include <net/if.h> 75 #include <net/if_var.h> 76 #include <net/netisr.h> 77 #include <net/vnet.h> 78 79 #include <netinet/in.h> 80 #include <netinet/in_var.h> 81 #include <netinet/in_systm.h> 82 #include <netinet/ip.h> 83 #include <netinet/ip_var.h> 84 #include <netinet/ip_options.h> 85 #include <netinet/igmp.h> 86 #include <netinet/igmp_var.h> 87 88 #include <machine/in_cksum.h> 89 90 #include <security/mac/mac_framework.h> 91 92 #ifndef KTR_IGMPV3 93 #define KTR_IGMPV3 KTR_INET 94 #endif 95 96 static struct igmp_ifsoftc * 97 igi_alloc_locked(struct ifnet *); 98 static void igi_delete_locked(const struct ifnet *); 99 static void igmp_dispatch_queue(struct mbufq *, int, const int); 100 static void igmp_fasttimo_vnet(void); 101 static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 102 static int igmp_handle_state_change(struct in_multi *, 103 struct igmp_ifsoftc *); 104 static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 105 static int igmp_input_v1_query(struct ifnet *, const struct ip *, 106 const struct igmp *); 107 static int igmp_input_v2_query(struct ifnet *, const struct ip *, 108 const struct igmp *); 109 static int igmp_input_v3_query(struct ifnet *, const struct ip *, 110 /*const*/ struct igmpv3 *); 111 static int igmp_input_v3_group_query(struct in_multi *, 112 struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 113 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 114 /*const*/ struct igmp *); 115 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 116 /*const*/ struct igmp *); 117 static void igmp_intr(struct mbuf *); 118 static int igmp_isgroupreported(const struct in_addr); 119 static struct mbuf * 120 igmp_ra_alloc(void); 121 #ifdef KTR 122 static char * igmp_rec_type_to_str(const int); 123 #endif 124 static void igmp_set_version(struct igmp_ifsoftc *, const int); 125 static void igmp_slowtimo_vnet(void); 126 static int igmp_v1v2_queue_report(struct in_multi *, const int); 127 static void igmp_v1v2_process_group_timer(struct in_multi *, const int); 128 static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 129 static void igmp_v2_update_group(struct in_multi *, const int); 130 static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 131 static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 132 static struct mbuf * 133 igmp_v3_encap_report(struct ifnet *, struct mbuf *); 134 static int igmp_v3_enqueue_group_record(struct mbufq *, 135 struct in_multi *, const int, const int, const int); 136 static int igmp_v3_enqueue_filter_change(struct mbufq *, 137 struct in_multi *); 138 static void igmp_v3_process_group_timers(struct in_multi_head *, 139 struct mbufq *, struct mbufq *, struct in_multi *, 140 const int); 141 static int igmp_v3_merge_state_changes(struct in_multi *, 142 struct mbufq *); 143 static void igmp_v3_suppress_group_record(struct in_multi *); 144 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 145 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 146 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 147 static int sysctl_igmp_stat(SYSCTL_HANDLER_ARGS); 148 149 static const struct netisr_handler igmp_nh = { 150 .nh_name = "igmp", 151 .nh_handler = igmp_intr, 152 .nh_proto = NETISR_IGMP, 153 .nh_policy = NETISR_POLICY_SOURCE, 154 }; 155 156 /* 157 * System-wide globals. 158 * 159 * Unlocked access to these is OK, except for the global IGMP output 160 * queue. The IGMP subsystem lock ends up being system-wide for the moment, 161 * because all VIMAGEs have to share a global output queue, as netisrs 162 * themselves are not virtualized. 163 * 164 * Locking: 165 * * The permitted lock order is: IN_MULTI_LIST_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 166 * Any may be taken independently; if any are held at the same 167 * time, the above lock order must be followed. 168 * * All output is delegated to the netisr. 169 * Now that Giant has been eliminated, the netisr may be inlined. 170 * * IN_MULTI_LIST_LOCK covers in_multi. 171 * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 172 * including the output queue. 173 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 174 * per-link state iterators. 175 * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 176 * therefore it is not refcounted. 177 * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 178 * 179 * Reference counting 180 * * IGMP acquires its own reference every time an in_multi is passed to 181 * it and the group is being joined for the first time. 182 * * IGMP releases its reference(s) on in_multi in a deferred way, 183 * because the operations which process the release run as part of 184 * a loop whose control variables are directly affected by the release 185 * (that, and not recursing on the IF_ADDR_LOCK). 186 * 187 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 188 * to a vnet in ifp->if_vnet. 189 * 190 * SMPng: XXX We may potentially race operations on ifma_protospec. 191 * The problem is that we currently lack a clean way of taking the 192 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 193 * as anything which modifies ifma needs to be covered by that lock. 194 * So check for ifma_protospec being NULL before proceeding. 195 */ 196 struct mtx igmp_mtx; 197 198 struct mbuf *m_raopt; /* Router Alert option */ 199 static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 200 201 /* 202 * VIMAGE-wide globals. 203 * 204 * The IGMPv3 timers themselves need to run per-image, however, 205 * protosw timers run globally (see tcp). 206 * An ifnet can only be in one vimage at a time, and the loopback 207 * ifnet, loif, is itself virtualized. 208 * It would otherwise be possible to seriously hose IGMP state, 209 * and create inconsistencies in upstream multicast routing, if you have 210 * multiple VIMAGEs running on the same link joining different multicast 211 * groups, UNLESS the "primary IP address" is different. This is because 212 * IGMP for IPv4 does not force link-local addresses to be used for each 213 * node, unlike MLD for IPv6. 214 * Obviously the IGMPv3 per-interface state has per-vimage granularity 215 * also as a result. 216 * 217 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 218 * policy to control the address used by IGMP on the link. 219 */ 220 VNET_DEFINE_STATIC(int, interface_timers_running); /* IGMPv3 general 221 * query response */ 222 VNET_DEFINE_STATIC(int, state_change_timers_running); /* IGMPv3 state-change 223 * retransmit */ 224 VNET_DEFINE_STATIC(int, current_state_timers_running); /* IGMPv1/v2 host 225 * report; IGMPv3 g/sg 226 * query response */ 227 228 #define V_interface_timers_running VNET(interface_timers_running) 229 #define V_state_change_timers_running VNET(state_change_timers_running) 230 #define V_current_state_timers_running VNET(current_state_timers_running) 231 232 VNET_PCPUSTAT_DEFINE(struct igmpstat, igmpstat); 233 VNET_PCPUSTAT_SYSINIT(igmpstat); 234 VNET_PCPUSTAT_SYSUNINIT(igmpstat); 235 236 VNET_DEFINE_STATIC(LIST_HEAD(, igmp_ifsoftc), igi_head) = 237 LIST_HEAD_INITIALIZER(igi_head); 238 VNET_DEFINE_STATIC(struct timeval, igmp_gsrdelay) = {10, 0}; 239 240 #define V_igi_head VNET(igi_head) 241 #define V_igmp_gsrdelay VNET(igmp_gsrdelay) 242 243 VNET_DEFINE_STATIC(int, igmp_recvifkludge) = 1; 244 VNET_DEFINE_STATIC(int, igmp_sendra) = 1; 245 VNET_DEFINE_STATIC(int, igmp_sendlocal) = 1; 246 VNET_DEFINE_STATIC(int, igmp_v1enable) = 1; 247 VNET_DEFINE_STATIC(int, igmp_v2enable) = 1; 248 VNET_DEFINE_STATIC(int, igmp_legacysupp); 249 VNET_DEFINE_STATIC(int, igmp_default_version) = IGMP_VERSION_3; 250 251 #define V_igmp_recvifkludge VNET(igmp_recvifkludge) 252 #define V_igmp_sendra VNET(igmp_sendra) 253 #define V_igmp_sendlocal VNET(igmp_sendlocal) 254 #define V_igmp_v1enable VNET(igmp_v1enable) 255 #define V_igmp_v2enable VNET(igmp_v2enable) 256 #define V_igmp_legacysupp VNET(igmp_legacysupp) 257 #define V_igmp_default_version VNET(igmp_default_version) 258 259 /* 260 * Virtualized sysctls. 261 */ 262 SYSCTL_PROC(_net_inet_igmp, IGMPCTL_STATS, stats, 263 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_MPSAFE, 264 &VNET_NAME(igmpstat), 0, sysctl_igmp_stat, "S,igmpstat", 265 "IGMP statistics (struct igmpstat, netinet/igmp_var.h)"); 266 SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 267 &VNET_NAME(igmp_recvifkludge), 0, 268 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 269 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 270 &VNET_NAME(igmp_sendra), 0, 271 "Send IP Router Alert option in IGMPv2/v3 messages"); 272 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 273 &VNET_NAME(igmp_sendlocal), 0, 274 "Send IGMP membership reports for 224.0.0.0/24 groups"); 275 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 276 &VNET_NAME(igmp_v1enable), 0, 277 "Enable backwards compatibility with IGMPv1"); 278 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 279 &VNET_NAME(igmp_v2enable), 0, 280 "Enable backwards compatibility with IGMPv2"); 281 SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 282 &VNET_NAME(igmp_legacysupp), 0, 283 "Allow v1/v2 reports to suppress v3 group responses"); 284 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 285 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 286 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 287 "Default version of IGMP to run on each interface"); 288 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 289 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 290 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 291 "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 292 293 /* 294 * Non-virtualized sysctls. 295 */ 296 static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 297 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 298 "Per-interface IGMPv3 state"); 299 300 static __inline void 301 igmp_save_context(struct mbuf *m, struct ifnet *ifp) 302 { 303 304 #ifdef VIMAGE 305 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 306 #endif /* VIMAGE */ 307 m->m_pkthdr.rcvif = ifp; 308 m->m_pkthdr.flowid = ifp->if_index; 309 } 310 311 static __inline void 312 igmp_scrub_context(struct mbuf *m) 313 { 314 315 m->m_pkthdr.PH_loc.ptr = NULL; 316 m->m_pkthdr.flowid = 0; 317 } 318 319 /* 320 * Restore context from a queued IGMP output chain. 321 * Return saved ifindex. 322 * 323 * VIMAGE: The assertion is there to make sure that we 324 * actually called CURVNET_SET() with what's in the mbuf chain. 325 */ 326 static __inline uint32_t 327 igmp_restore_context(struct mbuf *m) 328 { 329 330 #ifdef notyet 331 #if defined(VIMAGE) && defined(INVARIANTS) 332 KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 333 ("%s: called when curvnet was not restored", __func__)); 334 #endif 335 #endif 336 return (m->m_pkthdr.flowid); 337 } 338 339 /* 340 * IGMP statistics. 341 */ 342 static int 343 sysctl_igmp_stat(SYSCTL_HANDLER_ARGS) 344 { 345 struct igmpstat igps0; 346 int error; 347 char *p; 348 349 error = sysctl_wire_old_buffer(req, sizeof(struct igmpstat)); 350 if (error) 351 return (error); 352 353 if (req->oldptr != NULL) { 354 if (req->oldlen < sizeof(struct igmpstat)) 355 error = ENOMEM; 356 else { 357 /* 358 * Copy the counters, and explicitly set the struct's 359 * version and length fields. 360 */ 361 COUNTER_ARRAY_COPY(VNET(igmpstat), &igps0, 362 sizeof(struct igmpstat) / sizeof(uint64_t)); 363 igps0.igps_version = IGPS_VERSION_3; 364 igps0.igps_len = IGPS_VERSION3_LEN; 365 error = SYSCTL_OUT(req, &igps0, 366 sizeof(struct igmpstat)); 367 } 368 } else 369 req->validlen = sizeof(struct igmpstat); 370 if (error) 371 goto out; 372 if (req->newptr != NULL) { 373 if (req->newlen < sizeof(struct igmpstat)) 374 error = ENOMEM; 375 else 376 error = SYSCTL_IN(req, &igps0, 377 sizeof(igps0)); 378 if (error) 379 goto out; 380 /* 381 * igps0 must be "all zero". 382 */ 383 p = (char *)&igps0; 384 while (p < (char *)&igps0 + sizeof(igps0) && *p == '\0') 385 p++; 386 if (p != (char *)&igps0 + sizeof(igps0)) { 387 error = EINVAL; 388 goto out; 389 } 390 COUNTER_ARRAY_ZERO(VNET(igmpstat), 391 sizeof(struct igmpstat) / sizeof(uint64_t)); 392 } 393 out: 394 return (error); 395 } 396 397 /* 398 * Retrieve or set default IGMP version. 399 * 400 * VIMAGE: Assume curvnet set by caller. 401 * SMPng: NOTE: Serialized by IGMP lock. 402 */ 403 static int 404 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 405 { 406 int error; 407 int new; 408 409 error = sysctl_wire_old_buffer(req, sizeof(int)); 410 if (error) 411 return (error); 412 413 IGMP_LOCK(); 414 415 new = V_igmp_default_version; 416 417 error = sysctl_handle_int(oidp, &new, 0, req); 418 if (error || !req->newptr) 419 goto out_locked; 420 421 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 422 error = EINVAL; 423 goto out_locked; 424 } 425 426 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 427 V_igmp_default_version, new); 428 429 V_igmp_default_version = new; 430 431 out_locked: 432 IGMP_UNLOCK(); 433 return (error); 434 } 435 436 /* 437 * Retrieve or set threshold between group-source queries in seconds. 438 * 439 * VIMAGE: Assume curvnet set by caller. 440 * SMPng: NOTE: Serialized by IGMP lock. 441 */ 442 static int 443 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 444 { 445 int error; 446 int i; 447 448 error = sysctl_wire_old_buffer(req, sizeof(int)); 449 if (error) 450 return (error); 451 452 IGMP_LOCK(); 453 454 i = V_igmp_gsrdelay.tv_sec; 455 456 error = sysctl_handle_int(oidp, &i, 0, req); 457 if (error || !req->newptr) 458 goto out_locked; 459 460 if (i < -1 || i >= 60) { 461 error = EINVAL; 462 goto out_locked; 463 } 464 465 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 466 V_igmp_gsrdelay.tv_sec, i); 467 V_igmp_gsrdelay.tv_sec = i; 468 469 out_locked: 470 IGMP_UNLOCK(); 471 return (error); 472 } 473 474 /* 475 * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 476 * For use by ifmcstat(8). 477 * 478 * SMPng: NOTE: Does an unlocked ifindex space read. 479 * VIMAGE: Assume curvnet set by caller. The node handler itself 480 * is not directly virtualized. 481 */ 482 static int 483 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 484 { 485 int *name; 486 int error; 487 u_int namelen; 488 struct ifnet *ifp; 489 struct igmp_ifsoftc *igi; 490 491 name = (int *)arg1; 492 namelen = arg2; 493 494 if (req->newptr != NULL) 495 return (EPERM); 496 497 if (namelen != 1) 498 return (EINVAL); 499 500 error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo)); 501 if (error) 502 return (error); 503 504 IN_MULTI_LIST_LOCK(); 505 IGMP_LOCK(); 506 507 if (name[0] <= 0 || name[0] > V_if_index) { 508 error = ENOENT; 509 goto out_locked; 510 } 511 512 error = ENOENT; 513 514 ifp = ifnet_byindex(name[0]); 515 if (ifp == NULL) 516 goto out_locked; 517 518 LIST_FOREACH(igi, &V_igi_head, igi_link) { 519 if (ifp == igi->igi_ifp) { 520 struct igmp_ifinfo info; 521 522 info.igi_version = igi->igi_version; 523 info.igi_v1_timer = igi->igi_v1_timer; 524 info.igi_v2_timer = igi->igi_v2_timer; 525 info.igi_v3_timer = igi->igi_v3_timer; 526 info.igi_flags = igi->igi_flags; 527 info.igi_rv = igi->igi_rv; 528 info.igi_qi = igi->igi_qi; 529 info.igi_qri = igi->igi_qri; 530 info.igi_uri = igi->igi_uri; 531 error = SYSCTL_OUT(req, &info, sizeof(info)); 532 break; 533 } 534 } 535 536 out_locked: 537 IGMP_UNLOCK(); 538 IN_MULTI_LIST_UNLOCK(); 539 return (error); 540 } 541 542 /* 543 * Dispatch an entire queue of pending packet chains 544 * using the netisr. 545 * VIMAGE: Assumes the vnet pointer has been set. 546 */ 547 static void 548 igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 549 { 550 struct epoch_tracker et; 551 struct mbuf *m; 552 553 NET_EPOCH_ENTER(et); 554 while ((m = mbufq_dequeue(mq)) != NULL) { 555 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 556 if (loop) 557 m->m_flags |= M_IGMP_LOOP; 558 netisr_dispatch(NETISR_IGMP, m); 559 if (--limit == 0) 560 break; 561 } 562 NET_EPOCH_EXIT(et); 563 } 564 565 /* 566 * Filter outgoing IGMP report state by group. 567 * 568 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 569 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 570 * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 571 * this may break certain IGMP snooping switches which rely on the old 572 * report behaviour. 573 * 574 * Return zero if the given group is one for which IGMP reports 575 * should be suppressed, or non-zero if reports should be issued. 576 */ 577 static __inline int 578 igmp_isgroupreported(const struct in_addr addr) 579 { 580 581 if (in_allhosts(addr) || 582 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 583 return (0); 584 585 return (1); 586 } 587 588 /* 589 * Construct a Router Alert option to use in outgoing packets. 590 */ 591 static struct mbuf * 592 igmp_ra_alloc(void) 593 { 594 struct mbuf *m; 595 struct ipoption *p; 596 597 m = m_get(M_WAITOK, MT_DATA); 598 p = mtod(m, struct ipoption *); 599 p->ipopt_dst.s_addr = INADDR_ANY; 600 p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 601 p->ipopt_list[1] = 0x04; /* 4 bytes long */ 602 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 603 p->ipopt_list[3] = 0x00; /* pad byte */ 604 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 605 606 return (m); 607 } 608 609 /* 610 * Attach IGMP when PF_INET is attached to an interface. 611 */ 612 struct igmp_ifsoftc * 613 igmp_domifattach(struct ifnet *ifp) 614 { 615 struct igmp_ifsoftc *igi; 616 617 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 618 __func__, ifp, ifp->if_xname); 619 620 IGMP_LOCK(); 621 622 igi = igi_alloc_locked(ifp); 623 if (!(ifp->if_flags & IFF_MULTICAST)) 624 igi->igi_flags |= IGIF_SILENT; 625 626 IGMP_UNLOCK(); 627 628 return (igi); 629 } 630 631 /* 632 * VIMAGE: assume curvnet set by caller. 633 */ 634 static struct igmp_ifsoftc * 635 igi_alloc_locked(/*const*/ struct ifnet *ifp) 636 { 637 struct igmp_ifsoftc *igi; 638 639 IGMP_LOCK_ASSERT(); 640 641 igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 642 if (igi == NULL) 643 goto out; 644 645 igi->igi_ifp = ifp; 646 igi->igi_version = V_igmp_default_version; 647 igi->igi_flags = 0; 648 igi->igi_rv = IGMP_RV_INIT; 649 igi->igi_qi = IGMP_QI_INIT; 650 igi->igi_qri = IGMP_QRI_INIT; 651 igi->igi_uri = IGMP_URI_INIT; 652 mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 653 654 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 655 656 CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 657 ifp, ifp->if_xname); 658 659 out: 660 return (igi); 661 } 662 663 /* 664 * Hook for ifdetach. 665 * 666 * NOTE: Some finalization tasks need to run before the protocol domain 667 * is detached, but also before the link layer does its cleanup. 668 * 669 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 670 * XXX This is also bitten by unlocked ifma_protospec access. 671 */ 672 void 673 igmp_ifdetach(struct ifnet *ifp) 674 { 675 struct igmp_ifsoftc *igi; 676 struct ifmultiaddr *ifma, *next; 677 struct in_multi *inm; 678 struct in_multi_head inm_free_tmp; 679 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 680 ifp->if_xname); 681 682 SLIST_INIT(&inm_free_tmp); 683 IGMP_LOCK(); 684 685 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 686 if (igi->igi_version == IGMP_VERSION_3) { 687 IF_ADDR_WLOCK(ifp); 688 restart: 689 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 690 if (ifma->ifma_addr->sa_family != AF_INET || 691 ifma->ifma_protospec == NULL) 692 continue; 693 inm = (struct in_multi *)ifma->ifma_protospec; 694 if (inm->inm_state == IGMP_LEAVING_MEMBER) 695 inm_rele_locked(&inm_free_tmp, inm); 696 inm_clear_recorded(inm); 697 if (__predict_false(ifma_restart)) { 698 ifma_restart = false; 699 goto restart; 700 } 701 } 702 IF_ADDR_WUNLOCK(ifp); 703 inm_release_list_deferred(&inm_free_tmp); 704 } 705 IGMP_UNLOCK(); 706 707 } 708 709 /* 710 * Hook for domifdetach. 711 */ 712 void 713 igmp_domifdetach(struct ifnet *ifp) 714 { 715 716 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 717 __func__, ifp, ifp->if_xname); 718 719 IGMP_LOCK(); 720 igi_delete_locked(ifp); 721 IGMP_UNLOCK(); 722 } 723 724 static void 725 igi_delete_locked(const struct ifnet *ifp) 726 { 727 struct igmp_ifsoftc *igi, *tigi; 728 729 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 730 __func__, ifp, ifp->if_xname); 731 732 IGMP_LOCK_ASSERT(); 733 734 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 735 if (igi->igi_ifp == ifp) { 736 /* 737 * Free deferred General Query responses. 738 */ 739 mbufq_drain(&igi->igi_gq); 740 741 LIST_REMOVE(igi, igi_link); 742 free(igi, M_IGMP); 743 return; 744 } 745 } 746 } 747 748 /* 749 * Process a received IGMPv1 query. 750 * Return non-zero if the message should be dropped. 751 * 752 * VIMAGE: The curvnet pointer is derived from the input ifp. 753 */ 754 static int 755 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 756 const struct igmp *igmp) 757 { 758 struct ifmultiaddr *ifma; 759 struct igmp_ifsoftc *igi; 760 struct in_multi *inm; 761 762 NET_EPOCH_ASSERT(); 763 764 /* 765 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 766 * 224.0.0.1. They are always treated as General Queries. 767 * igmp_group is always ignored. Do not drop it as a userland 768 * daemon may wish to see it. 769 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 770 */ 771 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 772 IGMPSTAT_INC(igps_rcv_badqueries); 773 return (0); 774 } 775 IGMPSTAT_INC(igps_rcv_gen_queries); 776 777 IN_MULTI_LIST_LOCK(); 778 IGMP_LOCK(); 779 780 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 781 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 782 783 if (igi->igi_flags & IGIF_LOOPBACK) { 784 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 785 ifp, ifp->if_xname); 786 goto out_locked; 787 } 788 789 /* 790 * Switch to IGMPv1 host compatibility mode. 791 */ 792 igmp_set_version(igi, IGMP_VERSION_1); 793 794 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 795 796 /* 797 * Start the timers in all of our group records 798 * for the interface on which the query arrived, 799 * except those which are already running. 800 */ 801 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 802 if (ifma->ifma_addr->sa_family != AF_INET || 803 ifma->ifma_protospec == NULL) 804 continue; 805 inm = (struct in_multi *)ifma->ifma_protospec; 806 if (inm->inm_timer != 0) 807 continue; 808 switch (inm->inm_state) { 809 case IGMP_NOT_MEMBER: 810 case IGMP_SILENT_MEMBER: 811 break; 812 case IGMP_G_QUERY_PENDING_MEMBER: 813 case IGMP_SG_QUERY_PENDING_MEMBER: 814 case IGMP_REPORTING_MEMBER: 815 case IGMP_IDLE_MEMBER: 816 case IGMP_LAZY_MEMBER: 817 case IGMP_SLEEPING_MEMBER: 818 case IGMP_AWAKENING_MEMBER: 819 inm->inm_state = IGMP_REPORTING_MEMBER; 820 inm->inm_timer = IGMP_RANDOM_DELAY( 821 IGMP_V1V2_MAX_RI * PR_FASTHZ); 822 V_current_state_timers_running = 1; 823 break; 824 case IGMP_LEAVING_MEMBER: 825 break; 826 } 827 } 828 829 out_locked: 830 IGMP_UNLOCK(); 831 IN_MULTI_LIST_UNLOCK(); 832 833 return (0); 834 } 835 836 /* 837 * Process a received IGMPv2 general or group-specific query. 838 */ 839 static int 840 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 841 const struct igmp *igmp) 842 { 843 struct ifmultiaddr *ifma; 844 struct igmp_ifsoftc *igi; 845 struct in_multi *inm; 846 int is_general_query; 847 uint16_t timer; 848 849 NET_EPOCH_ASSERT(); 850 851 is_general_query = 0; 852 853 /* 854 * Validate address fields upfront. 855 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 856 */ 857 if (in_nullhost(igmp->igmp_group)) { 858 /* 859 * IGMPv2 General Query. 860 * If this was not sent to the all-hosts group, ignore it. 861 */ 862 if (!in_allhosts(ip->ip_dst)) 863 return (0); 864 IGMPSTAT_INC(igps_rcv_gen_queries); 865 is_general_query = 1; 866 } else { 867 /* IGMPv2 Group-Specific Query. */ 868 IGMPSTAT_INC(igps_rcv_group_queries); 869 } 870 871 IN_MULTI_LIST_LOCK(); 872 IGMP_LOCK(); 873 874 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 875 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 876 877 if (igi->igi_flags & IGIF_LOOPBACK) { 878 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 879 ifp, ifp->if_xname); 880 goto out_locked; 881 } 882 883 /* 884 * Ignore v2 query if in v1 Compatibility Mode. 885 */ 886 if (igi->igi_version == IGMP_VERSION_1) 887 goto out_locked; 888 889 igmp_set_version(igi, IGMP_VERSION_2); 890 891 timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE; 892 if (timer == 0) 893 timer = 1; 894 895 if (is_general_query) { 896 /* 897 * For each reporting group joined on this 898 * interface, kick the report timer. 899 */ 900 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 901 ifp, ifp->if_xname); 902 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 903 if (ifma->ifma_addr->sa_family != AF_INET || 904 ifma->ifma_protospec == NULL) 905 continue; 906 inm = (struct in_multi *)ifma->ifma_protospec; 907 igmp_v2_update_group(inm, timer); 908 } 909 } else { 910 /* 911 * Group-specific IGMPv2 query, we need only 912 * look up the single group to process it. 913 */ 914 inm = inm_lookup(ifp, igmp->igmp_group); 915 if (inm != NULL) { 916 CTR3(KTR_IGMPV3, 917 "process v2 query 0x%08x on ifp %p(%s)", 918 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 919 igmp_v2_update_group(inm, timer); 920 } 921 } 922 923 out_locked: 924 IGMP_UNLOCK(); 925 IN_MULTI_LIST_UNLOCK(); 926 927 return (0); 928 } 929 930 /* 931 * Update the report timer on a group in response to an IGMPv2 query. 932 * 933 * If we are becoming the reporting member for this group, start the timer. 934 * If we already are the reporting member for this group, and timer is 935 * below the threshold, reset it. 936 * 937 * We may be updating the group for the first time since we switched 938 * to IGMPv3. If we are, then we must clear any recorded source lists, 939 * and transition to REPORTING state; the group timer is overloaded 940 * for group and group-source query responses. 941 * 942 * Unlike IGMPv3, the delay per group should be jittered 943 * to avoid bursts of IGMPv2 reports. 944 */ 945 static void 946 igmp_v2_update_group(struct in_multi *inm, const int timer) 947 { 948 949 CTR4(KTR_IGMPV3, "0x%08x: %s/%s timer=%d", __func__, 950 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname, timer); 951 952 IN_MULTI_LIST_LOCK_ASSERT(); 953 954 switch (inm->inm_state) { 955 case IGMP_NOT_MEMBER: 956 case IGMP_SILENT_MEMBER: 957 break; 958 case IGMP_REPORTING_MEMBER: 959 if (inm->inm_timer != 0 && 960 inm->inm_timer <= timer) { 961 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 962 "skipping.", __func__); 963 break; 964 } 965 /* FALLTHROUGH */ 966 case IGMP_SG_QUERY_PENDING_MEMBER: 967 case IGMP_G_QUERY_PENDING_MEMBER: 968 case IGMP_IDLE_MEMBER: 969 case IGMP_LAZY_MEMBER: 970 case IGMP_AWAKENING_MEMBER: 971 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 972 inm->inm_state = IGMP_REPORTING_MEMBER; 973 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 974 V_current_state_timers_running = 1; 975 break; 976 case IGMP_SLEEPING_MEMBER: 977 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 978 inm->inm_state = IGMP_AWAKENING_MEMBER; 979 break; 980 case IGMP_LEAVING_MEMBER: 981 break; 982 } 983 } 984 985 /* 986 * Process a received IGMPv3 general, group-specific or 987 * group-and-source-specific query. 988 * Assumes m has already been pulled up to the full IGMP message length. 989 * Return 0 if successful, otherwise an appropriate error code is returned. 990 */ 991 static int 992 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 993 /*const*/ struct igmpv3 *igmpv3) 994 { 995 struct igmp_ifsoftc *igi; 996 struct in_multi *inm; 997 int is_general_query; 998 uint32_t maxresp, nsrc, qqi; 999 uint16_t timer; 1000 uint8_t qrv; 1001 1002 is_general_query = 0; 1003 1004 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 1005 1006 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 1007 if (maxresp >= 128) { 1008 maxresp = IGMP_MANT(igmpv3->igmp_code) << 1009 (IGMP_EXP(igmpv3->igmp_code) + 3); 1010 } 1011 1012 /* 1013 * Robustness must never be less than 2 for on-wire IGMPv3. 1014 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 1015 * an exception for interfaces whose IGMPv3 state changes 1016 * are redirected to loopback (e.g. MANET). 1017 */ 1018 qrv = IGMP_QRV(igmpv3->igmp_misc); 1019 if (qrv < 2) { 1020 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 1021 qrv, IGMP_RV_INIT); 1022 qrv = IGMP_RV_INIT; 1023 } 1024 1025 qqi = igmpv3->igmp_qqi; 1026 if (qqi >= 128) { 1027 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 1028 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 1029 } 1030 1031 timer = maxresp * PR_FASTHZ / IGMP_TIMER_SCALE; 1032 if (timer == 0) 1033 timer = 1; 1034 1035 nsrc = ntohs(igmpv3->igmp_numsrc); 1036 1037 /* 1038 * Validate address fields and versions upfront before 1039 * accepting v3 query. 1040 * XXX SMPng: Unlocked access to igmpstat counters here. 1041 */ 1042 if (in_nullhost(igmpv3->igmp_group)) { 1043 /* 1044 * IGMPv3 General Query. 1045 * 1046 * General Queries SHOULD be directed to 224.0.0.1. 1047 * A general query with a source list has undefined 1048 * behaviour; discard it. 1049 */ 1050 IGMPSTAT_INC(igps_rcv_gen_queries); 1051 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1052 IGMPSTAT_INC(igps_rcv_badqueries); 1053 return (0); 1054 } 1055 is_general_query = 1; 1056 } else { 1057 /* Group or group-source specific query. */ 1058 if (nsrc == 0) 1059 IGMPSTAT_INC(igps_rcv_group_queries); 1060 else 1061 IGMPSTAT_INC(igps_rcv_gsr_queries); 1062 } 1063 1064 IN_MULTI_LIST_LOCK(); 1065 IGMP_LOCK(); 1066 1067 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1068 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1069 1070 if (igi->igi_flags & IGIF_LOOPBACK) { 1071 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1072 ifp, ifp->if_xname); 1073 goto out_locked; 1074 } 1075 1076 /* 1077 * Discard the v3 query if we're in Compatibility Mode. 1078 * The RFC is not obviously worded that hosts need to stay in 1079 * compatibility mode until the Old Version Querier Present 1080 * timer expires. 1081 */ 1082 if (igi->igi_version != IGMP_VERSION_3) { 1083 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1084 igi->igi_version, ifp, ifp->if_xname); 1085 goto out_locked; 1086 } 1087 1088 igmp_set_version(igi, IGMP_VERSION_3); 1089 igi->igi_rv = qrv; 1090 igi->igi_qi = qqi; 1091 igi->igi_qri = maxresp; 1092 1093 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1094 maxresp); 1095 1096 if (is_general_query) { 1097 /* 1098 * Schedule a current-state report on this ifp for 1099 * all groups, possibly containing source lists. 1100 * If there is a pending General Query response 1101 * scheduled earlier than the selected delay, do 1102 * not schedule any other reports. 1103 * Otherwise, reset the interface timer. 1104 */ 1105 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1106 ifp, ifp->if_xname); 1107 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1108 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1109 V_interface_timers_running = 1; 1110 } 1111 } else { 1112 /* 1113 * Group-source-specific queries are throttled on 1114 * a per-group basis to defeat denial-of-service attempts. 1115 * Queries for groups we are not a member of on this 1116 * link are simply ignored. 1117 */ 1118 inm = inm_lookup(ifp, igmpv3->igmp_group); 1119 if (inm == NULL) 1120 goto out_locked; 1121 if (nsrc > 0) { 1122 if (!ratecheck(&inm->inm_lastgsrtv, 1123 &V_igmp_gsrdelay)) { 1124 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1125 __func__); 1126 IGMPSTAT_INC(igps_drop_gsr_queries); 1127 goto out_locked; 1128 } 1129 } 1130 CTR3(KTR_IGMPV3, "process v3 0x%08x query on ifp %p(%s)", 1131 ntohl(igmpv3->igmp_group.s_addr), ifp, ifp->if_xname); 1132 /* 1133 * If there is a pending General Query response 1134 * scheduled sooner than the selected delay, no 1135 * further report need be scheduled. 1136 * Otherwise, prepare to respond to the 1137 * group-specific or group-and-source query. 1138 */ 1139 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1140 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1141 } 1142 1143 out_locked: 1144 IGMP_UNLOCK(); 1145 IN_MULTI_LIST_UNLOCK(); 1146 1147 return (0); 1148 } 1149 1150 /* 1151 * Process a received IGMPv3 group-specific or group-and-source-specific 1152 * query. 1153 * Return <0 if any error occurred. Currently this is ignored. 1154 */ 1155 static int 1156 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1157 int timer, /*const*/ struct igmpv3 *igmpv3) 1158 { 1159 int retval; 1160 uint16_t nsrc; 1161 1162 IN_MULTI_LIST_LOCK_ASSERT(); 1163 IGMP_LOCK_ASSERT(); 1164 1165 retval = 0; 1166 1167 switch (inm->inm_state) { 1168 case IGMP_NOT_MEMBER: 1169 case IGMP_SILENT_MEMBER: 1170 case IGMP_SLEEPING_MEMBER: 1171 case IGMP_LAZY_MEMBER: 1172 case IGMP_AWAKENING_MEMBER: 1173 case IGMP_IDLE_MEMBER: 1174 case IGMP_LEAVING_MEMBER: 1175 return (retval); 1176 break; 1177 case IGMP_REPORTING_MEMBER: 1178 case IGMP_G_QUERY_PENDING_MEMBER: 1179 case IGMP_SG_QUERY_PENDING_MEMBER: 1180 break; 1181 } 1182 1183 nsrc = ntohs(igmpv3->igmp_numsrc); 1184 1185 /* 1186 * Deal with group-specific queries upfront. 1187 * If any group query is already pending, purge any recorded 1188 * source-list state if it exists, and schedule a query response 1189 * for this group-specific query. 1190 */ 1191 if (nsrc == 0) { 1192 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1193 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1194 inm_clear_recorded(inm); 1195 timer = min(inm->inm_timer, timer); 1196 } 1197 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1198 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1199 V_current_state_timers_running = 1; 1200 return (retval); 1201 } 1202 1203 /* 1204 * Deal with the case where a group-and-source-specific query has 1205 * been received but a group-specific query is already pending. 1206 */ 1207 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1208 timer = min(inm->inm_timer, timer); 1209 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1210 V_current_state_timers_running = 1; 1211 return (retval); 1212 } 1213 1214 /* 1215 * Finally, deal with the case where a group-and-source-specific 1216 * query has been received, where a response to a previous g-s-r 1217 * query exists, or none exists. 1218 * In this case, we need to parse the source-list which the Querier 1219 * has provided us with and check if we have any source list filter 1220 * entries at T1 for these sources. If we do not, there is no need 1221 * schedule a report and the query may be dropped. 1222 * If we do, we must record them and schedule a current-state 1223 * report for those sources. 1224 * FIXME: Handling source lists larger than 1 mbuf requires that 1225 * we pass the mbuf chain pointer down to this function, and use 1226 * m_getptr() to walk the chain. 1227 */ 1228 if (inm->inm_nsrc > 0) { 1229 const struct in_addr *ap; 1230 int i, nrecorded; 1231 1232 ap = (const struct in_addr *)(igmpv3 + 1); 1233 nrecorded = 0; 1234 for (i = 0; i < nsrc; i++, ap++) { 1235 retval = inm_record_source(inm, ap->s_addr); 1236 if (retval < 0) 1237 break; 1238 nrecorded += retval; 1239 } 1240 if (nrecorded > 0) { 1241 CTR1(KTR_IGMPV3, 1242 "%s: schedule response to SG query", __func__); 1243 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1244 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1245 V_current_state_timers_running = 1; 1246 } 1247 } 1248 1249 return (retval); 1250 } 1251 1252 /* 1253 * Process a received IGMPv1 host membership report. 1254 * 1255 * NOTE: 0.0.0.0 workaround breaks const correctness. 1256 */ 1257 static int 1258 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1259 /*const*/ struct igmp *igmp) 1260 { 1261 struct in_ifaddr *ia; 1262 struct in_multi *inm; 1263 1264 IGMPSTAT_INC(igps_rcv_reports); 1265 1266 if (ifp->if_flags & IFF_LOOPBACK) 1267 return (0); 1268 1269 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1270 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1271 IGMPSTAT_INC(igps_rcv_badreports); 1272 return (EINVAL); 1273 } 1274 1275 /* 1276 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1277 * Booting clients may use the source address 0.0.0.0. Some 1278 * IGMP daemons may not know how to use IP_RECVIF to determine 1279 * the interface upon which this message was received. 1280 * Replace 0.0.0.0 with the subnet address if told to do so. 1281 */ 1282 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1283 IFP_TO_IA(ifp, ia); 1284 if (ia != NULL) 1285 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1286 } 1287 1288 CTR3(KTR_IGMPV3, "process v1 report 0x%08x on ifp %p(%s)", 1289 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1290 1291 /* 1292 * IGMPv1 report suppression. 1293 * If we are a member of this group, and our membership should be 1294 * reported, stop our group timer and transition to the 'lazy' state. 1295 */ 1296 IN_MULTI_LIST_LOCK(); 1297 inm = inm_lookup(ifp, igmp->igmp_group); 1298 if (inm != NULL) { 1299 struct igmp_ifsoftc *igi; 1300 1301 igi = inm->inm_igi; 1302 if (igi == NULL) { 1303 KASSERT(igi != NULL, 1304 ("%s: no igi for ifp %p", __func__, ifp)); 1305 goto out_locked; 1306 } 1307 1308 IGMPSTAT_INC(igps_rcv_ourreports); 1309 1310 /* 1311 * If we are in IGMPv3 host mode, do not allow the 1312 * other host's IGMPv1 report to suppress our reports 1313 * unless explicitly configured to do so. 1314 */ 1315 if (igi->igi_version == IGMP_VERSION_3) { 1316 if (V_igmp_legacysupp) 1317 igmp_v3_suppress_group_record(inm); 1318 goto out_locked; 1319 } 1320 1321 inm->inm_timer = 0; 1322 1323 switch (inm->inm_state) { 1324 case IGMP_NOT_MEMBER: 1325 case IGMP_SILENT_MEMBER: 1326 break; 1327 case IGMP_IDLE_MEMBER: 1328 case IGMP_LAZY_MEMBER: 1329 case IGMP_AWAKENING_MEMBER: 1330 CTR3(KTR_IGMPV3, 1331 "report suppressed for 0x%08x on ifp %p(%s)", 1332 ntohl(igmp->igmp_group.s_addr), ifp, 1333 ifp->if_xname); 1334 case IGMP_SLEEPING_MEMBER: 1335 inm->inm_state = IGMP_SLEEPING_MEMBER; 1336 break; 1337 case IGMP_REPORTING_MEMBER: 1338 CTR3(KTR_IGMPV3, 1339 "report suppressed for 0x%08x on ifp %p(%s)", 1340 ntohl(igmp->igmp_group.s_addr), ifp, 1341 ifp->if_xname); 1342 if (igi->igi_version == IGMP_VERSION_1) 1343 inm->inm_state = IGMP_LAZY_MEMBER; 1344 else if (igi->igi_version == IGMP_VERSION_2) 1345 inm->inm_state = IGMP_SLEEPING_MEMBER; 1346 break; 1347 case IGMP_G_QUERY_PENDING_MEMBER: 1348 case IGMP_SG_QUERY_PENDING_MEMBER: 1349 case IGMP_LEAVING_MEMBER: 1350 break; 1351 } 1352 } 1353 1354 out_locked: 1355 IN_MULTI_LIST_UNLOCK(); 1356 1357 return (0); 1358 } 1359 1360 /* 1361 * Process a received IGMPv2 host membership report. 1362 * 1363 * NOTE: 0.0.0.0 workaround breaks const correctness. 1364 */ 1365 static int 1366 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1367 /*const*/ struct igmp *igmp) 1368 { 1369 struct in_ifaddr *ia; 1370 struct in_multi *inm; 1371 1372 /* 1373 * Make sure we don't hear our own membership report. Fast 1374 * leave requires knowing that we are the only member of a 1375 * group. 1376 */ 1377 IFP_TO_IA(ifp, ia); 1378 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1379 return (0); 1380 } 1381 1382 IGMPSTAT_INC(igps_rcv_reports); 1383 1384 if (ifp->if_flags & IFF_LOOPBACK) { 1385 return (0); 1386 } 1387 1388 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1389 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1390 IGMPSTAT_INC(igps_rcv_badreports); 1391 return (EINVAL); 1392 } 1393 1394 /* 1395 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1396 * Booting clients may use the source address 0.0.0.0. Some 1397 * IGMP daemons may not know how to use IP_RECVIF to determine 1398 * the interface upon which this message was received. 1399 * Replace 0.0.0.0 with the subnet address if told to do so. 1400 */ 1401 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1402 if (ia != NULL) 1403 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1404 } 1405 1406 CTR3(KTR_IGMPV3, "process v2 report 0x%08x on ifp %p(%s)", 1407 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1408 1409 /* 1410 * IGMPv2 report suppression. 1411 * If we are a member of this group, and our membership should be 1412 * reported, and our group timer is pending or about to be reset, 1413 * stop our group timer by transitioning to the 'lazy' state. 1414 */ 1415 IN_MULTI_LIST_LOCK(); 1416 inm = inm_lookup(ifp, igmp->igmp_group); 1417 if (inm != NULL) { 1418 struct igmp_ifsoftc *igi; 1419 1420 igi = inm->inm_igi; 1421 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1422 1423 IGMPSTAT_INC(igps_rcv_ourreports); 1424 1425 /* 1426 * If we are in IGMPv3 host mode, do not allow the 1427 * other host's IGMPv1 report to suppress our reports 1428 * unless explicitly configured to do so. 1429 */ 1430 if (igi->igi_version == IGMP_VERSION_3) { 1431 if (V_igmp_legacysupp) 1432 igmp_v3_suppress_group_record(inm); 1433 goto out_locked; 1434 } 1435 1436 inm->inm_timer = 0; 1437 1438 switch (inm->inm_state) { 1439 case IGMP_NOT_MEMBER: 1440 case IGMP_SILENT_MEMBER: 1441 case IGMP_SLEEPING_MEMBER: 1442 break; 1443 case IGMP_REPORTING_MEMBER: 1444 case IGMP_IDLE_MEMBER: 1445 case IGMP_AWAKENING_MEMBER: 1446 CTR3(KTR_IGMPV3, 1447 "report suppressed for 0x%08x on ifp %p(%s)", 1448 ntohl(igmp->igmp_group.s_addr), ifp, ifp->if_xname); 1449 case IGMP_LAZY_MEMBER: 1450 inm->inm_state = IGMP_LAZY_MEMBER; 1451 break; 1452 case IGMP_G_QUERY_PENDING_MEMBER: 1453 case IGMP_SG_QUERY_PENDING_MEMBER: 1454 case IGMP_LEAVING_MEMBER: 1455 break; 1456 } 1457 } 1458 1459 out_locked: 1460 IN_MULTI_LIST_UNLOCK(); 1461 1462 return (0); 1463 } 1464 1465 int 1466 igmp_input(struct mbuf **mp, int *offp, int proto) 1467 { 1468 int iphlen; 1469 struct ifnet *ifp; 1470 struct igmp *igmp; 1471 struct ip *ip; 1472 struct mbuf *m; 1473 int igmplen; 1474 int minlen; 1475 int queryver; 1476 1477 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1478 1479 m = *mp; 1480 ifp = m->m_pkthdr.rcvif; 1481 *mp = NULL; 1482 1483 IGMPSTAT_INC(igps_rcv_total); 1484 1485 ip = mtod(m, struct ip *); 1486 iphlen = *offp; 1487 igmplen = ntohs(ip->ip_len) - iphlen; 1488 1489 /* 1490 * Validate lengths. 1491 */ 1492 if (igmplen < IGMP_MINLEN) { 1493 IGMPSTAT_INC(igps_rcv_tooshort); 1494 m_freem(m); 1495 return (IPPROTO_DONE); 1496 } 1497 1498 /* 1499 * Always pullup to the minimum size for v1/v2 or v3 1500 * to amortize calls to m_pullup(). 1501 */ 1502 minlen = iphlen; 1503 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1504 minlen += IGMP_V3_QUERY_MINLEN; 1505 else 1506 minlen += IGMP_MINLEN; 1507 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1508 (m = m_pullup(m, minlen)) == NULL) { 1509 IGMPSTAT_INC(igps_rcv_tooshort); 1510 return (IPPROTO_DONE); 1511 } 1512 ip = mtod(m, struct ip *); 1513 1514 /* 1515 * Validate checksum. 1516 */ 1517 m->m_data += iphlen; 1518 m->m_len -= iphlen; 1519 igmp = mtod(m, struct igmp *); 1520 if (in_cksum(m, igmplen)) { 1521 IGMPSTAT_INC(igps_rcv_badsum); 1522 m_freem(m); 1523 return (IPPROTO_DONE); 1524 } 1525 m->m_data -= iphlen; 1526 m->m_len += iphlen; 1527 1528 /* 1529 * IGMP control traffic is link-scope, and must have a TTL of 1. 1530 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1531 * probe packets may come from beyond the LAN. 1532 */ 1533 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1534 IGMPSTAT_INC(igps_rcv_badttl); 1535 m_freem(m); 1536 return (IPPROTO_DONE); 1537 } 1538 1539 switch (igmp->igmp_type) { 1540 case IGMP_HOST_MEMBERSHIP_QUERY: 1541 if (igmplen == IGMP_MINLEN) { 1542 if (igmp->igmp_code == 0) 1543 queryver = IGMP_VERSION_1; 1544 else 1545 queryver = IGMP_VERSION_2; 1546 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1547 queryver = IGMP_VERSION_3; 1548 } else { 1549 IGMPSTAT_INC(igps_rcv_tooshort); 1550 m_freem(m); 1551 return (IPPROTO_DONE); 1552 } 1553 1554 switch (queryver) { 1555 case IGMP_VERSION_1: 1556 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1557 if (!V_igmp_v1enable) 1558 break; 1559 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1560 m_freem(m); 1561 return (IPPROTO_DONE); 1562 } 1563 break; 1564 1565 case IGMP_VERSION_2: 1566 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1567 if (!V_igmp_v2enable) 1568 break; 1569 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1570 m_freem(m); 1571 return (IPPROTO_DONE); 1572 } 1573 break; 1574 1575 case IGMP_VERSION_3: { 1576 struct igmpv3 *igmpv3; 1577 uint16_t igmpv3len; 1578 uint16_t nsrc; 1579 1580 IGMPSTAT_INC(igps_rcv_v3_queries); 1581 igmpv3 = (struct igmpv3 *)igmp; 1582 /* 1583 * Validate length based on source count. 1584 */ 1585 nsrc = ntohs(igmpv3->igmp_numsrc); 1586 if (nsrc * sizeof(in_addr_t) > 1587 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1588 IGMPSTAT_INC(igps_rcv_tooshort); 1589 m_freem(m); 1590 return (IPPROTO_DONE); 1591 } 1592 /* 1593 * m_pullup() may modify m, so pullup in 1594 * this scope. 1595 */ 1596 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1597 sizeof(struct in_addr) * nsrc; 1598 if ((!M_WRITABLE(m) || 1599 m->m_len < igmpv3len) && 1600 (m = m_pullup(m, igmpv3len)) == NULL) { 1601 IGMPSTAT_INC(igps_rcv_tooshort); 1602 return (IPPROTO_DONE); 1603 } 1604 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1605 + iphlen); 1606 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1607 m_freem(m); 1608 return (IPPROTO_DONE); 1609 } 1610 } 1611 break; 1612 } 1613 break; 1614 1615 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1616 if (!V_igmp_v1enable) 1617 break; 1618 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1619 m_freem(m); 1620 return (IPPROTO_DONE); 1621 } 1622 break; 1623 1624 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1625 if (!V_igmp_v2enable) 1626 break; 1627 if (!ip_checkrouteralert(m)) 1628 IGMPSTAT_INC(igps_rcv_nora); 1629 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1630 m_freem(m); 1631 return (IPPROTO_DONE); 1632 } 1633 break; 1634 1635 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1636 /* 1637 * Hosts do not need to process IGMPv3 membership reports, 1638 * as report suppression is no longer required. 1639 */ 1640 if (!ip_checkrouteralert(m)) 1641 IGMPSTAT_INC(igps_rcv_nora); 1642 break; 1643 1644 default: 1645 break; 1646 } 1647 1648 /* 1649 * Pass all valid IGMP packets up to any process(es) listening on a 1650 * raw IGMP socket. 1651 */ 1652 *mp = m; 1653 return (rip_input(mp, offp, proto)); 1654 } 1655 1656 /* 1657 * Fast timeout handler (global). 1658 * VIMAGE: Timeout handlers are expected to service all vimages. 1659 */ 1660 void 1661 igmp_fasttimo(void) 1662 { 1663 VNET_ITERATOR_DECL(vnet_iter); 1664 1665 VNET_LIST_RLOCK_NOSLEEP(); 1666 VNET_FOREACH(vnet_iter) { 1667 CURVNET_SET(vnet_iter); 1668 igmp_fasttimo_vnet(); 1669 CURVNET_RESTORE(); 1670 } 1671 VNET_LIST_RUNLOCK_NOSLEEP(); 1672 } 1673 1674 /* 1675 * Fast timeout handler (per-vnet). 1676 * Sends are shuffled off to a netisr to deal with Giant. 1677 * 1678 * VIMAGE: Assume caller has set up our curvnet. 1679 */ 1680 static void 1681 igmp_fasttimo_vnet(void) 1682 { 1683 struct mbufq scq; /* State-change packets */ 1684 struct mbufq qrq; /* Query response packets */ 1685 struct ifnet *ifp; 1686 struct igmp_ifsoftc *igi; 1687 struct ifmultiaddr *ifma, *next; 1688 struct in_multi *inm; 1689 struct in_multi_head inm_free_tmp; 1690 int loop, uri_fasthz; 1691 1692 loop = 0; 1693 uri_fasthz = 0; 1694 1695 /* 1696 * Quick check to see if any work needs to be done, in order to 1697 * minimize the overhead of fasttimo processing. 1698 * SMPng: XXX Unlocked reads. 1699 */ 1700 if (!V_current_state_timers_running && 1701 !V_interface_timers_running && 1702 !V_state_change_timers_running) 1703 return; 1704 1705 SLIST_INIT(&inm_free_tmp); 1706 IN_MULTI_LIST_LOCK(); 1707 IGMP_LOCK(); 1708 1709 /* 1710 * IGMPv3 General Query response timer processing. 1711 */ 1712 if (V_interface_timers_running) { 1713 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1714 1715 V_interface_timers_running = 0; 1716 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1717 if (igi->igi_v3_timer == 0) { 1718 /* Do nothing. */ 1719 } else if (--igi->igi_v3_timer == 0) { 1720 igmp_v3_dispatch_general_query(igi); 1721 } else { 1722 V_interface_timers_running = 1; 1723 } 1724 } 1725 } 1726 1727 if (!V_current_state_timers_running && 1728 !V_state_change_timers_running) 1729 goto out_locked; 1730 1731 V_current_state_timers_running = 0; 1732 V_state_change_timers_running = 0; 1733 1734 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1735 1736 /* 1737 * IGMPv1/v2/v3 host report and state-change timer processing. 1738 * Note: Processing a v3 group timer may remove a node. 1739 */ 1740 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1741 ifp = igi->igi_ifp; 1742 1743 if (igi->igi_version == IGMP_VERSION_3) { 1744 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1745 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1746 PR_FASTHZ); 1747 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1748 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1749 } 1750 1751 IF_ADDR_WLOCK(ifp); 1752 restart: 1753 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 1754 if (ifma->ifma_addr->sa_family != AF_INET || 1755 ifma->ifma_protospec == NULL) 1756 continue; 1757 inm = (struct in_multi *)ifma->ifma_protospec; 1758 switch (igi->igi_version) { 1759 case IGMP_VERSION_1: 1760 case IGMP_VERSION_2: 1761 igmp_v1v2_process_group_timer(inm, 1762 igi->igi_version); 1763 break; 1764 case IGMP_VERSION_3: 1765 igmp_v3_process_group_timers(&inm_free_tmp, &qrq, 1766 &scq, inm, uri_fasthz); 1767 break; 1768 } 1769 if (__predict_false(ifma_restart)) { 1770 ifma_restart = false; 1771 goto restart; 1772 } 1773 } 1774 IF_ADDR_WUNLOCK(ifp); 1775 1776 if (igi->igi_version == IGMP_VERSION_3) { 1777 igmp_dispatch_queue(&qrq, 0, loop); 1778 igmp_dispatch_queue(&scq, 0, loop); 1779 1780 /* 1781 * Free the in_multi reference(s) for this 1782 * IGMP lifecycle. 1783 */ 1784 inm_release_list_deferred(&inm_free_tmp); 1785 } 1786 } 1787 1788 out_locked: 1789 IGMP_UNLOCK(); 1790 IN_MULTI_LIST_UNLOCK(); 1791 } 1792 1793 /* 1794 * Update host report group timer for IGMPv1/v2. 1795 * Will update the global pending timer flags. 1796 */ 1797 static void 1798 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1799 { 1800 int report_timer_expired; 1801 1802 IN_MULTI_LIST_LOCK_ASSERT(); 1803 IGMP_LOCK_ASSERT(); 1804 1805 if (inm->inm_timer == 0) { 1806 report_timer_expired = 0; 1807 } else if (--inm->inm_timer == 0) { 1808 report_timer_expired = 1; 1809 } else { 1810 V_current_state_timers_running = 1; 1811 return; 1812 } 1813 1814 switch (inm->inm_state) { 1815 case IGMP_NOT_MEMBER: 1816 case IGMP_SILENT_MEMBER: 1817 case IGMP_IDLE_MEMBER: 1818 case IGMP_LAZY_MEMBER: 1819 case IGMP_SLEEPING_MEMBER: 1820 case IGMP_AWAKENING_MEMBER: 1821 break; 1822 case IGMP_REPORTING_MEMBER: 1823 if (report_timer_expired) { 1824 inm->inm_state = IGMP_IDLE_MEMBER; 1825 (void)igmp_v1v2_queue_report(inm, 1826 (version == IGMP_VERSION_2) ? 1827 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1828 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1829 } 1830 break; 1831 case IGMP_G_QUERY_PENDING_MEMBER: 1832 case IGMP_SG_QUERY_PENDING_MEMBER: 1833 case IGMP_LEAVING_MEMBER: 1834 break; 1835 } 1836 } 1837 1838 /* 1839 * Update a group's timers for IGMPv3. 1840 * Will update the global pending timer flags. 1841 * Note: Unlocked read from igi. 1842 */ 1843 static void 1844 igmp_v3_process_group_timers(struct in_multi_head *inmh, 1845 struct mbufq *qrq, struct mbufq *scq, 1846 struct in_multi *inm, const int uri_fasthz) 1847 { 1848 int query_response_timer_expired; 1849 int state_change_retransmit_timer_expired; 1850 1851 IN_MULTI_LIST_LOCK_ASSERT(); 1852 IGMP_LOCK_ASSERT(); 1853 1854 query_response_timer_expired = 0; 1855 state_change_retransmit_timer_expired = 0; 1856 1857 /* 1858 * During a transition from v1/v2 compatibility mode back to v3, 1859 * a group record in REPORTING state may still have its group 1860 * timer active. This is a no-op in this function; it is easier 1861 * to deal with it here than to complicate the slow-timeout path. 1862 */ 1863 if (inm->inm_timer == 0) { 1864 query_response_timer_expired = 0; 1865 } else if (--inm->inm_timer == 0) { 1866 query_response_timer_expired = 1; 1867 } else { 1868 V_current_state_timers_running = 1; 1869 } 1870 1871 if (inm->inm_sctimer == 0) { 1872 state_change_retransmit_timer_expired = 0; 1873 } else if (--inm->inm_sctimer == 0) { 1874 state_change_retransmit_timer_expired = 1; 1875 } else { 1876 V_state_change_timers_running = 1; 1877 } 1878 1879 /* We are in fasttimo, so be quick about it. */ 1880 if (!state_change_retransmit_timer_expired && 1881 !query_response_timer_expired) 1882 return; 1883 1884 switch (inm->inm_state) { 1885 case IGMP_NOT_MEMBER: 1886 case IGMP_SILENT_MEMBER: 1887 case IGMP_SLEEPING_MEMBER: 1888 case IGMP_LAZY_MEMBER: 1889 case IGMP_AWAKENING_MEMBER: 1890 case IGMP_IDLE_MEMBER: 1891 break; 1892 case IGMP_G_QUERY_PENDING_MEMBER: 1893 case IGMP_SG_QUERY_PENDING_MEMBER: 1894 /* 1895 * Respond to a previously pending Group-Specific 1896 * or Group-and-Source-Specific query by enqueueing 1897 * the appropriate Current-State report for 1898 * immediate transmission. 1899 */ 1900 if (query_response_timer_expired) { 1901 int retval __unused; 1902 1903 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1904 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1905 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1906 __func__, retval); 1907 inm->inm_state = IGMP_REPORTING_MEMBER; 1908 /* XXX Clear recorded sources for next time. */ 1909 inm_clear_recorded(inm); 1910 } 1911 /* FALLTHROUGH */ 1912 case IGMP_REPORTING_MEMBER: 1913 case IGMP_LEAVING_MEMBER: 1914 if (state_change_retransmit_timer_expired) { 1915 /* 1916 * State-change retransmission timer fired. 1917 * If there are any further pending retransmissions, 1918 * set the global pending state-change flag, and 1919 * reset the timer. 1920 */ 1921 if (--inm->inm_scrv > 0) { 1922 inm->inm_sctimer = uri_fasthz; 1923 V_state_change_timers_running = 1; 1924 } 1925 /* 1926 * Retransmit the previously computed state-change 1927 * report. If there are no further pending 1928 * retransmissions, the mbuf queue will be consumed. 1929 * Update T0 state to T1 as we have now sent 1930 * a state-change. 1931 */ 1932 (void)igmp_v3_merge_state_changes(inm, scq); 1933 1934 inm_commit(inm); 1935 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 1936 ntohl(inm->inm_addr.s_addr), 1937 inm->inm_ifp->if_xname); 1938 1939 /* 1940 * If we are leaving the group for good, make sure 1941 * we release IGMP's reference to it. 1942 * This release must be deferred using a SLIST, 1943 * as we are called from a loop which traverses 1944 * the in_ifmultiaddr TAILQ. 1945 */ 1946 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1947 inm->inm_scrv == 0) { 1948 inm->inm_state = IGMP_NOT_MEMBER; 1949 inm_rele_locked(inmh, inm); 1950 } 1951 } 1952 break; 1953 } 1954 } 1955 1956 /* 1957 * Suppress a group's pending response to a group or source/group query. 1958 * 1959 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1960 * Do NOT update ST1/ST0 as this operation merely suppresses 1961 * the currently pending group record. 1962 * Do NOT suppress the response to a general query. It is possible but 1963 * it would require adding another state or flag. 1964 */ 1965 static void 1966 igmp_v3_suppress_group_record(struct in_multi *inm) 1967 { 1968 1969 IN_MULTI_LIST_LOCK_ASSERT(); 1970 1971 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1972 ("%s: not IGMPv3 mode on link", __func__)); 1973 1974 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1975 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1976 return; 1977 1978 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1979 inm_clear_recorded(inm); 1980 1981 inm->inm_timer = 0; 1982 inm->inm_state = IGMP_REPORTING_MEMBER; 1983 } 1984 1985 /* 1986 * Switch to a different IGMP version on the given interface, 1987 * as per Section 7.2.1. 1988 */ 1989 static void 1990 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1991 { 1992 int old_version_timer; 1993 1994 IGMP_LOCK_ASSERT(); 1995 1996 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 1997 version, igi->igi_ifp, igi->igi_ifp->if_xname); 1998 1999 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 2000 /* 2001 * Compute the "Older Version Querier Present" timer as per 2002 * Section 8.12. 2003 */ 2004 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 2005 old_version_timer *= PR_SLOWHZ; 2006 2007 if (version == IGMP_VERSION_1) { 2008 igi->igi_v1_timer = old_version_timer; 2009 igi->igi_v2_timer = 0; 2010 } else if (version == IGMP_VERSION_2) { 2011 igi->igi_v1_timer = 0; 2012 igi->igi_v2_timer = old_version_timer; 2013 } 2014 } 2015 2016 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2017 if (igi->igi_version != IGMP_VERSION_2) { 2018 igi->igi_version = IGMP_VERSION_2; 2019 igmp_v3_cancel_link_timers(igi); 2020 } 2021 } else if (igi->igi_v1_timer > 0) { 2022 if (igi->igi_version != IGMP_VERSION_1) { 2023 igi->igi_version = IGMP_VERSION_1; 2024 igmp_v3_cancel_link_timers(igi); 2025 } 2026 } 2027 } 2028 2029 /* 2030 * Cancel pending IGMPv3 timers for the given link and all groups 2031 * joined on it; state-change, general-query, and group-query timers. 2032 * 2033 * Only ever called on a transition from v3 to Compatibility mode. Kill 2034 * the timers stone dead (this may be expensive for large N groups), they 2035 * will be restarted if Compatibility Mode deems that they must be due to 2036 * query processing. 2037 */ 2038 static void 2039 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2040 { 2041 struct ifmultiaddr *ifma, *ifmatmp; 2042 struct ifnet *ifp; 2043 struct in_multi *inm; 2044 struct in_multi_head inm_free_tmp; 2045 2046 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2047 igi->igi_ifp, igi->igi_ifp->if_xname); 2048 2049 IN_MULTI_LIST_LOCK_ASSERT(); 2050 IGMP_LOCK_ASSERT(); 2051 NET_EPOCH_ASSERT(); 2052 2053 SLIST_INIT(&inm_free_tmp); 2054 2055 /* 2056 * Stop the v3 General Query Response on this link stone dead. 2057 * If fasttimo is woken up due to V_interface_timers_running, 2058 * the flag will be cleared if there are no pending link timers. 2059 */ 2060 igi->igi_v3_timer = 0; 2061 2062 /* 2063 * Now clear the current-state and state-change report timers 2064 * for all memberships scoped to this link. 2065 */ 2066 ifp = igi->igi_ifp; 2067 IF_ADDR_WLOCK(ifp); 2068 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, ifmatmp) { 2069 if (ifma->ifma_addr->sa_family != AF_INET || 2070 ifma->ifma_protospec == NULL) 2071 continue; 2072 inm = (struct in_multi *)ifma->ifma_protospec; 2073 switch (inm->inm_state) { 2074 case IGMP_NOT_MEMBER: 2075 case IGMP_SILENT_MEMBER: 2076 case IGMP_IDLE_MEMBER: 2077 case IGMP_LAZY_MEMBER: 2078 case IGMP_SLEEPING_MEMBER: 2079 case IGMP_AWAKENING_MEMBER: 2080 /* 2081 * These states are either not relevant in v3 mode, 2082 * or are unreported. Do nothing. 2083 */ 2084 break; 2085 case IGMP_LEAVING_MEMBER: 2086 /* 2087 * If we are leaving the group and switching to 2088 * compatibility mode, we need to release the final 2089 * reference held for issuing the INCLUDE {}, and 2090 * transition to REPORTING to ensure the host leave 2091 * message is sent upstream to the old querier -- 2092 * transition to NOT would lose the leave and race. 2093 */ 2094 inm_rele_locked(&inm_free_tmp, inm); 2095 /* FALLTHROUGH */ 2096 case IGMP_G_QUERY_PENDING_MEMBER: 2097 case IGMP_SG_QUERY_PENDING_MEMBER: 2098 inm_clear_recorded(inm); 2099 /* FALLTHROUGH */ 2100 case IGMP_REPORTING_MEMBER: 2101 inm->inm_state = IGMP_REPORTING_MEMBER; 2102 break; 2103 } 2104 /* 2105 * Always clear state-change and group report timers. 2106 * Free any pending IGMPv3 state-change records. 2107 */ 2108 inm->inm_sctimer = 0; 2109 inm->inm_timer = 0; 2110 mbufq_drain(&inm->inm_scq); 2111 } 2112 IF_ADDR_WUNLOCK(ifp); 2113 2114 inm_release_list_deferred(&inm_free_tmp); 2115 } 2116 2117 /* 2118 * Update the Older Version Querier Present timers for a link. 2119 * See Section 7.2.1 of RFC 3376. 2120 */ 2121 static void 2122 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2123 { 2124 2125 IGMP_LOCK_ASSERT(); 2126 2127 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2128 /* 2129 * IGMPv1 and IGMPv2 Querier Present timers expired. 2130 * 2131 * Revert to IGMPv3. 2132 */ 2133 if (igi->igi_version != IGMP_VERSION_3) { 2134 CTR5(KTR_IGMPV3, 2135 "%s: transition from v%d -> v%d on %p(%s)", 2136 __func__, igi->igi_version, IGMP_VERSION_3, 2137 igi->igi_ifp, igi->igi_ifp->if_xname); 2138 igi->igi_version = IGMP_VERSION_3; 2139 } 2140 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2141 /* 2142 * IGMPv1 Querier Present timer expired, 2143 * IGMPv2 Querier Present timer running. 2144 * If IGMPv2 was disabled since last timeout, 2145 * revert to IGMPv3. 2146 * If IGMPv2 is enabled, revert to IGMPv2. 2147 */ 2148 if (!V_igmp_v2enable) { 2149 CTR5(KTR_IGMPV3, 2150 "%s: transition from v%d -> v%d on %p(%s)", 2151 __func__, igi->igi_version, IGMP_VERSION_3, 2152 igi->igi_ifp, igi->igi_ifp->if_xname); 2153 igi->igi_v2_timer = 0; 2154 igi->igi_version = IGMP_VERSION_3; 2155 } else { 2156 --igi->igi_v2_timer; 2157 if (igi->igi_version != IGMP_VERSION_2) { 2158 CTR5(KTR_IGMPV3, 2159 "%s: transition from v%d -> v%d on %p(%s)", 2160 __func__, igi->igi_version, IGMP_VERSION_2, 2161 igi->igi_ifp, igi->igi_ifp->if_xname); 2162 igi->igi_version = IGMP_VERSION_2; 2163 igmp_v3_cancel_link_timers(igi); 2164 } 2165 } 2166 } else if (igi->igi_v1_timer > 0) { 2167 /* 2168 * IGMPv1 Querier Present timer running. 2169 * Stop IGMPv2 timer if running. 2170 * 2171 * If IGMPv1 was disabled since last timeout, 2172 * revert to IGMPv3. 2173 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2174 */ 2175 if (!V_igmp_v1enable) { 2176 CTR5(KTR_IGMPV3, 2177 "%s: transition from v%d -> v%d on %p(%s)", 2178 __func__, igi->igi_version, IGMP_VERSION_3, 2179 igi->igi_ifp, igi->igi_ifp->if_xname); 2180 igi->igi_v1_timer = 0; 2181 igi->igi_version = IGMP_VERSION_3; 2182 } else { 2183 --igi->igi_v1_timer; 2184 } 2185 if (igi->igi_v2_timer > 0) { 2186 CTR3(KTR_IGMPV3, 2187 "%s: cancel v2 timer on %p(%s)", 2188 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2189 igi->igi_v2_timer = 0; 2190 } 2191 } 2192 } 2193 2194 /* 2195 * Global slowtimo handler. 2196 * VIMAGE: Timeout handlers are expected to service all vimages. 2197 */ 2198 void 2199 igmp_slowtimo(void) 2200 { 2201 VNET_ITERATOR_DECL(vnet_iter); 2202 2203 VNET_LIST_RLOCK_NOSLEEP(); 2204 VNET_FOREACH(vnet_iter) { 2205 CURVNET_SET(vnet_iter); 2206 igmp_slowtimo_vnet(); 2207 CURVNET_RESTORE(); 2208 } 2209 VNET_LIST_RUNLOCK_NOSLEEP(); 2210 } 2211 2212 /* 2213 * Per-vnet slowtimo handler. 2214 */ 2215 static void 2216 igmp_slowtimo_vnet(void) 2217 { 2218 struct igmp_ifsoftc *igi; 2219 2220 IGMP_LOCK(); 2221 2222 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2223 igmp_v1v2_process_querier_timers(igi); 2224 } 2225 2226 IGMP_UNLOCK(); 2227 } 2228 2229 /* 2230 * Dispatch an IGMPv1/v2 host report or leave message. 2231 * These are always small enough to fit inside a single mbuf. 2232 */ 2233 static int 2234 igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2235 { 2236 struct epoch_tracker et; 2237 struct ifnet *ifp; 2238 struct igmp *igmp; 2239 struct ip *ip; 2240 struct mbuf *m; 2241 2242 IN_MULTI_LIST_LOCK_ASSERT(); 2243 IGMP_LOCK_ASSERT(); 2244 2245 ifp = inm->inm_ifp; 2246 2247 m = m_gethdr(M_NOWAIT, MT_DATA); 2248 if (m == NULL) 2249 return (ENOMEM); 2250 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2251 2252 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2253 2254 m->m_data += sizeof(struct ip); 2255 m->m_len = sizeof(struct igmp); 2256 2257 igmp = mtod(m, struct igmp *); 2258 igmp->igmp_type = type; 2259 igmp->igmp_code = 0; 2260 igmp->igmp_group = inm->inm_addr; 2261 igmp->igmp_cksum = 0; 2262 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2263 2264 m->m_data -= sizeof(struct ip); 2265 m->m_len += sizeof(struct ip); 2266 2267 ip = mtod(m, struct ip *); 2268 ip->ip_tos = 0; 2269 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2270 ip->ip_off = 0; 2271 ip->ip_p = IPPROTO_IGMP; 2272 ip->ip_src.s_addr = INADDR_ANY; 2273 2274 if (type == IGMP_HOST_LEAVE_MESSAGE) 2275 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2276 else 2277 ip->ip_dst = inm->inm_addr; 2278 2279 igmp_save_context(m, ifp); 2280 2281 m->m_flags |= M_IGMPV2; 2282 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2283 m->m_flags |= M_IGMP_LOOP; 2284 2285 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2286 NET_EPOCH_ENTER(et); 2287 netisr_dispatch(NETISR_IGMP, m); 2288 NET_EPOCH_EXIT(et); 2289 2290 return (0); 2291 } 2292 2293 /* 2294 * Process a state change from the upper layer for the given IPv4 group. 2295 * 2296 * Each socket holds a reference on the in_multi in its own ip_moptions. 2297 * The socket layer will have made the necessary updates to.the group 2298 * state, it is now up to IGMP to issue a state change report if there 2299 * has been any change between T0 (when the last state-change was issued) 2300 * and T1 (now). 2301 * 2302 * We use the IGMPv3 state machine at group level. The IGMP module 2303 * however makes the decision as to which IGMP protocol version to speak. 2304 * A state change *from* INCLUDE {} always means an initial join. 2305 * A state change *to* INCLUDE {} always means a final leave. 2306 * 2307 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2308 * save ourselves a bunch of work; any exclusive mode groups need not 2309 * compute source filter lists. 2310 * 2311 * VIMAGE: curvnet should have been set by caller, as this routine 2312 * is called from the socket option handlers. 2313 */ 2314 int 2315 igmp_change_state(struct in_multi *inm) 2316 { 2317 struct igmp_ifsoftc *igi; 2318 struct ifnet *ifp; 2319 int error; 2320 2321 error = 0; 2322 IN_MULTI_LOCK_ASSERT(); 2323 /* 2324 * Try to detect if the upper layer just asked us to change state 2325 * for an interface which has now gone away. 2326 */ 2327 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2328 ifp = inm->inm_ifma->ifma_ifp; 2329 /* 2330 * Sanity check that netinet's notion of ifp is the 2331 * same as net's. 2332 */ 2333 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2334 2335 IGMP_LOCK(); 2336 2337 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2338 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2339 2340 /* 2341 * If we detect a state transition to or from MCAST_UNDEFINED 2342 * for this group, then we are starting or finishing an IGMP 2343 * life cycle for this group. 2344 */ 2345 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2346 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2347 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2348 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2349 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2350 error = igmp_initial_join(inm, igi); 2351 goto out_locked; 2352 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2353 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2354 igmp_final_leave(inm, igi); 2355 goto out_locked; 2356 } 2357 } else { 2358 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2359 } 2360 2361 error = igmp_handle_state_change(inm, igi); 2362 2363 out_locked: 2364 IGMP_UNLOCK(); 2365 return (error); 2366 } 2367 2368 /* 2369 * Perform the initial join for an IGMP group. 2370 * 2371 * When joining a group: 2372 * If the group should have its IGMP traffic suppressed, do nothing. 2373 * IGMPv1 starts sending IGMPv1 host membership reports. 2374 * IGMPv2 starts sending IGMPv2 host membership reports. 2375 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2376 * initial state of the membership. 2377 */ 2378 static int 2379 igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2380 { 2381 struct ifnet *ifp; 2382 struct mbufq *mq; 2383 int error, retval, syncstates; 2384 2385 CTR4(KTR_IGMPV3, "%s: initial join 0x%08x on ifp %p(%s)", __func__, 2386 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2387 2388 error = 0; 2389 syncstates = 1; 2390 2391 ifp = inm->inm_ifp; 2392 2393 IN_MULTI_LOCK_ASSERT(); 2394 IGMP_LOCK_ASSERT(); 2395 2396 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2397 2398 /* 2399 * Groups joined on loopback or marked as 'not reported', 2400 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2401 * are never reported in any IGMP protocol exchanges. 2402 * All other groups enter the appropriate IGMP state machine 2403 * for the version in use on this link. 2404 * A link marked as IGIF_SILENT causes IGMP to be completely 2405 * disabled for the link. 2406 */ 2407 if ((ifp->if_flags & IFF_LOOPBACK) || 2408 (igi->igi_flags & IGIF_SILENT) || 2409 !igmp_isgroupreported(inm->inm_addr)) { 2410 CTR1(KTR_IGMPV3, 2411 "%s: not kicking state machine for silent group", __func__); 2412 inm->inm_state = IGMP_SILENT_MEMBER; 2413 inm->inm_timer = 0; 2414 } else { 2415 /* 2416 * Deal with overlapping in_multi lifecycle. 2417 * If this group was LEAVING, then make sure 2418 * we drop the reference we picked up to keep the 2419 * group around for the final INCLUDE {} enqueue. 2420 */ 2421 if (igi->igi_version == IGMP_VERSION_3 && 2422 inm->inm_state == IGMP_LEAVING_MEMBER) { 2423 MPASS(inm->inm_refcount > 1); 2424 inm_rele_locked(NULL, inm); 2425 } 2426 inm->inm_state = IGMP_REPORTING_MEMBER; 2427 2428 switch (igi->igi_version) { 2429 case IGMP_VERSION_1: 2430 case IGMP_VERSION_2: 2431 inm->inm_state = IGMP_IDLE_MEMBER; 2432 error = igmp_v1v2_queue_report(inm, 2433 (igi->igi_version == IGMP_VERSION_2) ? 2434 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2435 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2436 if (error == 0) { 2437 inm->inm_timer = IGMP_RANDOM_DELAY( 2438 IGMP_V1V2_MAX_RI * PR_FASTHZ); 2439 V_current_state_timers_running = 1; 2440 } 2441 break; 2442 2443 case IGMP_VERSION_3: 2444 /* 2445 * Defer update of T0 to T1, until the first copy 2446 * of the state change has been transmitted. 2447 */ 2448 syncstates = 0; 2449 2450 /* 2451 * Immediately enqueue a State-Change Report for 2452 * this interface, freeing any previous reports. 2453 * Don't kick the timers if there is nothing to do, 2454 * or if an error occurred. 2455 */ 2456 mq = &inm->inm_scq; 2457 mbufq_drain(mq); 2458 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2459 0, 0); 2460 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2461 __func__, retval); 2462 if (retval <= 0) { 2463 error = retval * -1; 2464 break; 2465 } 2466 2467 /* 2468 * Schedule transmission of pending state-change 2469 * report up to RV times for this link. The timer 2470 * will fire at the next igmp_fasttimo (~200ms), 2471 * giving us an opportunity to merge the reports. 2472 */ 2473 if (igi->igi_flags & IGIF_LOOPBACK) { 2474 inm->inm_scrv = 1; 2475 } else { 2476 KASSERT(igi->igi_rv > 1, 2477 ("%s: invalid robustness %d", __func__, 2478 igi->igi_rv)); 2479 inm->inm_scrv = igi->igi_rv; 2480 } 2481 inm->inm_sctimer = 1; 2482 V_state_change_timers_running = 1; 2483 2484 error = 0; 2485 break; 2486 } 2487 } 2488 2489 /* 2490 * Only update the T0 state if state change is atomic, 2491 * i.e. we don't need to wait for a timer to fire before we 2492 * can consider the state change to have been communicated. 2493 */ 2494 if (syncstates) { 2495 inm_commit(inm); 2496 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2497 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2498 } 2499 2500 return (error); 2501 } 2502 2503 /* 2504 * Issue an intermediate state change during the IGMP life-cycle. 2505 */ 2506 static int 2507 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2508 { 2509 struct ifnet *ifp; 2510 int retval; 2511 2512 CTR4(KTR_IGMPV3, "%s: state change for 0x%08x on ifp %p(%s)", __func__, 2513 ntohl(inm->inm_addr.s_addr), inm->inm_ifp, inm->inm_ifp->if_xname); 2514 2515 ifp = inm->inm_ifp; 2516 2517 IN_MULTI_LIST_LOCK_ASSERT(); 2518 IGMP_LOCK_ASSERT(); 2519 2520 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2521 2522 if ((ifp->if_flags & IFF_LOOPBACK) || 2523 (igi->igi_flags & IGIF_SILENT) || 2524 !igmp_isgroupreported(inm->inm_addr) || 2525 (igi->igi_version != IGMP_VERSION_3)) { 2526 if (!igmp_isgroupreported(inm->inm_addr)) { 2527 CTR1(KTR_IGMPV3, 2528 "%s: not kicking state machine for silent group", __func__); 2529 } 2530 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2531 inm_commit(inm); 2532 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2533 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2534 return (0); 2535 } 2536 2537 mbufq_drain(&inm->inm_scq); 2538 2539 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2540 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2541 if (retval <= 0) 2542 return (-retval); 2543 2544 /* 2545 * If record(s) were enqueued, start the state-change 2546 * report timer for this group. 2547 */ 2548 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2549 inm->inm_sctimer = 1; 2550 V_state_change_timers_running = 1; 2551 2552 return (0); 2553 } 2554 2555 /* 2556 * Perform the final leave for an IGMP group. 2557 * 2558 * When leaving a group: 2559 * IGMPv1 does nothing. 2560 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2561 * IGMPv3 enqueues a state-change report containing a transition 2562 * to INCLUDE {} for immediate transmission. 2563 */ 2564 static void 2565 igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2566 { 2567 int syncstates; 2568 2569 syncstates = 1; 2570 2571 CTR4(KTR_IGMPV3, "%s: final leave 0x%08x on ifp %p(%s)", 2572 __func__, ntohl(inm->inm_addr.s_addr), inm->inm_ifp, 2573 inm->inm_ifp->if_xname); 2574 2575 IN_MULTI_LIST_LOCK_ASSERT(); 2576 IGMP_LOCK_ASSERT(); 2577 2578 switch (inm->inm_state) { 2579 case IGMP_NOT_MEMBER: 2580 case IGMP_SILENT_MEMBER: 2581 case IGMP_LEAVING_MEMBER: 2582 /* Already leaving or left; do nothing. */ 2583 CTR1(KTR_IGMPV3, 2584 "%s: not kicking state machine for silent group", __func__); 2585 break; 2586 case IGMP_REPORTING_MEMBER: 2587 case IGMP_IDLE_MEMBER: 2588 case IGMP_G_QUERY_PENDING_MEMBER: 2589 case IGMP_SG_QUERY_PENDING_MEMBER: 2590 if (igi->igi_version == IGMP_VERSION_2) { 2591 #ifdef INVARIANTS 2592 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2593 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2594 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2595 __func__); 2596 #endif 2597 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2598 inm->inm_state = IGMP_NOT_MEMBER; 2599 } else if (igi->igi_version == IGMP_VERSION_3) { 2600 /* 2601 * Stop group timer and all pending reports. 2602 * Immediately enqueue a state-change report 2603 * TO_IN {} to be sent on the next fast timeout, 2604 * giving us an opportunity to merge reports. 2605 */ 2606 mbufq_drain(&inm->inm_scq); 2607 inm->inm_timer = 0; 2608 if (igi->igi_flags & IGIF_LOOPBACK) { 2609 inm->inm_scrv = 1; 2610 } else { 2611 inm->inm_scrv = igi->igi_rv; 2612 } 2613 CTR4(KTR_IGMPV3, "%s: Leaving 0x%08x/%s with %d " 2614 "pending retransmissions.", __func__, 2615 ntohl(inm->inm_addr.s_addr), 2616 inm->inm_ifp->if_xname, inm->inm_scrv); 2617 if (inm->inm_scrv == 0) { 2618 inm->inm_state = IGMP_NOT_MEMBER; 2619 inm->inm_sctimer = 0; 2620 } else { 2621 int retval __unused; 2622 2623 inm_acquire_locked(inm); 2624 2625 retval = igmp_v3_enqueue_group_record( 2626 &inm->inm_scq, inm, 1, 0, 0); 2627 KASSERT(retval != 0, 2628 ("%s: enqueue record = %d", __func__, 2629 retval)); 2630 2631 inm->inm_state = IGMP_LEAVING_MEMBER; 2632 inm->inm_sctimer = 1; 2633 V_state_change_timers_running = 1; 2634 syncstates = 0; 2635 } 2636 break; 2637 } 2638 break; 2639 case IGMP_LAZY_MEMBER: 2640 case IGMP_SLEEPING_MEMBER: 2641 case IGMP_AWAKENING_MEMBER: 2642 /* Our reports are suppressed; do nothing. */ 2643 break; 2644 } 2645 2646 if (syncstates) { 2647 inm_commit(inm); 2648 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for 0x%08x/%s", __func__, 2649 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2650 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2651 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for 0x%08x/%s", 2652 __func__, ntohl(inm->inm_addr.s_addr), 2653 inm->inm_ifp->if_xname); 2654 } 2655 } 2656 2657 /* 2658 * Enqueue an IGMPv3 group record to the given output queue. 2659 * 2660 * XXX This function could do with having the allocation code 2661 * split out, and the multiple-tree-walks coalesced into a single 2662 * routine as has been done in igmp_v3_enqueue_filter_change(). 2663 * 2664 * If is_state_change is zero, a current-state record is appended. 2665 * If is_state_change is non-zero, a state-change report is appended. 2666 * 2667 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2668 * If is_group_query is zero, and if there is a packet with free space 2669 * at the tail of the queue, it will be appended to providing there 2670 * is enough free space. 2671 * Otherwise a new mbuf packet chain is allocated. 2672 * 2673 * If is_source_query is non-zero, each source is checked to see if 2674 * it was recorded for a Group-Source query, and will be omitted if 2675 * it is not both in-mode and recorded. 2676 * 2677 * The function will attempt to allocate leading space in the packet 2678 * for the IP/IGMP header to be prepended without fragmenting the chain. 2679 * 2680 * If successful the size of all data appended to the queue is returned, 2681 * otherwise an error code less than zero is returned, or zero if 2682 * no record(s) were appended. 2683 */ 2684 static int 2685 igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2686 const int is_state_change, const int is_group_query, 2687 const int is_source_query) 2688 { 2689 struct igmp_grouprec ig; 2690 struct igmp_grouprec *pig; 2691 struct ifnet *ifp; 2692 struct ip_msource *ims, *nims; 2693 struct mbuf *m0, *m, *md; 2694 int is_filter_list_change; 2695 int minrec0len, m0srcs, msrcs, nbytes, off; 2696 int record_has_sources; 2697 int now; 2698 int type; 2699 in_addr_t naddr; 2700 uint8_t mode; 2701 2702 IN_MULTI_LIST_LOCK_ASSERT(); 2703 2704 ifp = inm->inm_ifp; 2705 is_filter_list_change = 0; 2706 m = NULL; 2707 m0 = NULL; 2708 m0srcs = 0; 2709 msrcs = 0; 2710 nbytes = 0; 2711 nims = NULL; 2712 record_has_sources = 1; 2713 pig = NULL; 2714 type = IGMP_DO_NOTHING; 2715 mode = inm->inm_st[1].iss_fmode; 2716 2717 /* 2718 * If we did not transition out of ASM mode during t0->t1, 2719 * and there are no source nodes to process, we can skip 2720 * the generation of source records. 2721 */ 2722 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2723 inm->inm_nsrc == 0) 2724 record_has_sources = 0; 2725 2726 if (is_state_change) { 2727 /* 2728 * Queue a state change record. 2729 * If the mode did not change, and there are non-ASM 2730 * listeners or source filters present, 2731 * we potentially need to issue two records for the group. 2732 * If we are transitioning to MCAST_UNDEFINED, we need 2733 * not send any sources. 2734 * If there are ASM listeners, and there was no filter 2735 * mode transition of any kind, do nothing. 2736 */ 2737 if (mode != inm->inm_st[0].iss_fmode) { 2738 if (mode == MCAST_EXCLUDE) { 2739 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2740 __func__); 2741 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2742 } else { 2743 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2744 __func__); 2745 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2746 if (mode == MCAST_UNDEFINED) 2747 record_has_sources = 0; 2748 } 2749 } else { 2750 if (record_has_sources) { 2751 is_filter_list_change = 1; 2752 } else { 2753 type = IGMP_DO_NOTHING; 2754 } 2755 } 2756 } else { 2757 /* 2758 * Queue a current state record. 2759 */ 2760 if (mode == MCAST_EXCLUDE) { 2761 type = IGMP_MODE_IS_EXCLUDE; 2762 } else if (mode == MCAST_INCLUDE) { 2763 type = IGMP_MODE_IS_INCLUDE; 2764 KASSERT(inm->inm_st[1].iss_asm == 0, 2765 ("%s: inm %p is INCLUDE but ASM count is %d", 2766 __func__, inm, inm->inm_st[1].iss_asm)); 2767 } 2768 } 2769 2770 /* 2771 * Generate the filter list changes using a separate function. 2772 */ 2773 if (is_filter_list_change) 2774 return (igmp_v3_enqueue_filter_change(mq, inm)); 2775 2776 if (type == IGMP_DO_NOTHING) { 2777 CTR3(KTR_IGMPV3, "%s: nothing to do for 0x%08x/%s", __func__, 2778 ntohl(inm->inm_addr.s_addr), inm->inm_ifp->if_xname); 2779 return (0); 2780 } 2781 2782 /* 2783 * If any sources are present, we must be able to fit at least 2784 * one in the trailing space of the tail packet's mbuf, 2785 * ideally more. 2786 */ 2787 minrec0len = sizeof(struct igmp_grouprec); 2788 if (record_has_sources) 2789 minrec0len += sizeof(in_addr_t); 2790 2791 CTR4(KTR_IGMPV3, "%s: queueing %s for 0x%08x/%s", __func__, 2792 igmp_rec_type_to_str(type), ntohl(inm->inm_addr.s_addr), 2793 inm->inm_ifp->if_xname); 2794 2795 /* 2796 * Check if we have a packet in the tail of the queue for this 2797 * group into which the first group record for this group will fit. 2798 * Otherwise allocate a new packet. 2799 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2800 * Note: Group records for G/GSR query responses MUST be sent 2801 * in their own packet. 2802 */ 2803 m0 = mbufq_last(mq); 2804 if (!is_group_query && 2805 m0 != NULL && 2806 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2807 (m0->m_pkthdr.len + minrec0len) < 2808 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2809 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2810 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2811 m = m0; 2812 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2813 } else { 2814 if (mbufq_full(mq)) { 2815 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2816 return (-ENOMEM); 2817 } 2818 m = NULL; 2819 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2820 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2821 if (!is_state_change && !is_group_query) { 2822 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2823 if (m) 2824 m->m_data += IGMP_LEADINGSPACE; 2825 } 2826 if (m == NULL) { 2827 m = m_gethdr(M_NOWAIT, MT_DATA); 2828 if (m) 2829 M_ALIGN(m, IGMP_LEADINGSPACE); 2830 } 2831 if (m == NULL) 2832 return (-ENOMEM); 2833 2834 igmp_save_context(m, ifp); 2835 2836 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2837 } 2838 2839 /* 2840 * Append group record. 2841 * If we have sources, we don't know how many yet. 2842 */ 2843 ig.ig_type = type; 2844 ig.ig_datalen = 0; 2845 ig.ig_numsrc = 0; 2846 ig.ig_group = inm->inm_addr; 2847 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2848 if (m != m0) 2849 m_freem(m); 2850 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2851 return (-ENOMEM); 2852 } 2853 nbytes += sizeof(struct igmp_grouprec); 2854 2855 /* 2856 * Append as many sources as will fit in the first packet. 2857 * If we are appending to a new packet, the chain allocation 2858 * may potentially use clusters; use m_getptr() in this case. 2859 * If we are appending to an existing packet, we need to obtain 2860 * a pointer to the group record after m_append(), in case a new 2861 * mbuf was allocated. 2862 * Only append sources which are in-mode at t1. If we are 2863 * transitioning to MCAST_UNDEFINED state on the group, do not 2864 * include source entries. 2865 * Only report recorded sources in our filter set when responding 2866 * to a group-source query. 2867 */ 2868 if (record_has_sources) { 2869 if (m == m0) { 2870 md = m_last(m); 2871 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2872 md->m_len - nbytes); 2873 } else { 2874 md = m_getptr(m, 0, &off); 2875 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2876 off); 2877 } 2878 msrcs = 0; 2879 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2880 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2881 ims->ims_haddr); 2882 now = ims_get_mode(inm, ims, 1); 2883 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2884 if ((now != mode) || 2885 (now == mode && mode == MCAST_UNDEFINED)) { 2886 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2887 continue; 2888 } 2889 if (is_source_query && ims->ims_stp == 0) { 2890 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2891 __func__); 2892 continue; 2893 } 2894 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2895 naddr = htonl(ims->ims_haddr); 2896 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2897 if (m != m0) 2898 m_freem(m); 2899 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2900 __func__); 2901 return (-ENOMEM); 2902 } 2903 nbytes += sizeof(in_addr_t); 2904 ++msrcs; 2905 if (msrcs == m0srcs) 2906 break; 2907 } 2908 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2909 msrcs); 2910 pig->ig_numsrc = htons(msrcs); 2911 nbytes += (msrcs * sizeof(in_addr_t)); 2912 } 2913 2914 if (is_source_query && msrcs == 0) { 2915 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2916 if (m != m0) 2917 m_freem(m); 2918 return (0); 2919 } 2920 2921 /* 2922 * We are good to go with first packet. 2923 */ 2924 if (m != m0) { 2925 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2926 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2927 mbufq_enqueue(mq, m); 2928 } else 2929 m->m_pkthdr.PH_vt.vt_nrecs++; 2930 2931 /* 2932 * No further work needed if no source list in packet(s). 2933 */ 2934 if (!record_has_sources) 2935 return (nbytes); 2936 2937 /* 2938 * Whilst sources remain to be announced, we need to allocate 2939 * a new packet and fill out as many sources as will fit. 2940 * Always try for a cluster first. 2941 */ 2942 while (nims != NULL) { 2943 if (mbufq_full(mq)) { 2944 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2945 return (-ENOMEM); 2946 } 2947 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2948 if (m) 2949 m->m_data += IGMP_LEADINGSPACE; 2950 if (m == NULL) { 2951 m = m_gethdr(M_NOWAIT, MT_DATA); 2952 if (m) 2953 M_ALIGN(m, IGMP_LEADINGSPACE); 2954 } 2955 if (m == NULL) 2956 return (-ENOMEM); 2957 igmp_save_context(m, ifp); 2958 md = m_getptr(m, 0, &off); 2959 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2960 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2961 2962 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2963 if (m != m0) 2964 m_freem(m); 2965 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2966 return (-ENOMEM); 2967 } 2968 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2969 nbytes += sizeof(struct igmp_grouprec); 2970 2971 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2972 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2973 2974 msrcs = 0; 2975 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2976 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", __func__, 2977 ims->ims_haddr); 2978 now = ims_get_mode(inm, ims, 1); 2979 if ((now != mode) || 2980 (now == mode && mode == MCAST_UNDEFINED)) { 2981 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2982 continue; 2983 } 2984 if (is_source_query && ims->ims_stp == 0) { 2985 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2986 __func__); 2987 continue; 2988 } 2989 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2990 naddr = htonl(ims->ims_haddr); 2991 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2992 if (m != m0) 2993 m_freem(m); 2994 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2995 __func__); 2996 return (-ENOMEM); 2997 } 2998 ++msrcs; 2999 if (msrcs == m0srcs) 3000 break; 3001 } 3002 pig->ig_numsrc = htons(msrcs); 3003 nbytes += (msrcs * sizeof(in_addr_t)); 3004 3005 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 3006 mbufq_enqueue(mq, m); 3007 } 3008 3009 return (nbytes); 3010 } 3011 3012 /* 3013 * Type used to mark record pass completion. 3014 * We exploit the fact we can cast to this easily from the 3015 * current filter modes on each ip_msource node. 3016 */ 3017 typedef enum { 3018 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 3019 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 3020 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 3021 REC_FULL = REC_ALLOW | REC_BLOCK 3022 } rectype_t; 3023 3024 /* 3025 * Enqueue an IGMPv3 filter list change to the given output queue. 3026 * 3027 * Source list filter state is held in an RB-tree. When the filter list 3028 * for a group is changed without changing its mode, we need to compute 3029 * the deltas between T0 and T1 for each source in the filter set, 3030 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 3031 * 3032 * As we may potentially queue two record types, and the entire R-B tree 3033 * needs to be walked at once, we break this out into its own function 3034 * so we can generate a tightly packed queue of packets. 3035 * 3036 * XXX This could be written to only use one tree walk, although that makes 3037 * serializing into the mbuf chains a bit harder. For now we do two walks 3038 * which makes things easier on us, and it may or may not be harder on 3039 * the L2 cache. 3040 * 3041 * If successful the size of all data appended to the queue is returned, 3042 * otherwise an error code less than zero is returned, or zero if 3043 * no record(s) were appended. 3044 */ 3045 static int 3046 igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3047 { 3048 static const int MINRECLEN = 3049 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3050 struct ifnet *ifp; 3051 struct igmp_grouprec ig; 3052 struct igmp_grouprec *pig; 3053 struct ip_msource *ims, *nims; 3054 struct mbuf *m, *m0, *md; 3055 in_addr_t naddr; 3056 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3057 int nallow, nblock; 3058 uint8_t mode, now, then; 3059 rectype_t crt, drt, nrt; 3060 3061 IN_MULTI_LIST_LOCK_ASSERT(); 3062 3063 if (inm->inm_nsrc == 0 || 3064 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3065 return (0); 3066 3067 ifp = inm->inm_ifp; /* interface */ 3068 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3069 crt = REC_NONE; /* current group record type */ 3070 drt = REC_NONE; /* mask of completed group record types */ 3071 nrt = REC_NONE; /* record type for current node */ 3072 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3073 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3074 npbytes = 0; /* # of bytes appended this packet */ 3075 rsrcs = 0; /* # sources encoded in current record */ 3076 schanged = 0; /* # nodes encoded in overall filter change */ 3077 nallow = 0; /* # of source entries in ALLOW_NEW */ 3078 nblock = 0; /* # of source entries in BLOCK_OLD */ 3079 nims = NULL; /* next tree node pointer */ 3080 3081 /* 3082 * For each possible filter record mode. 3083 * The first kind of source we encounter tells us which 3084 * is the first kind of record we start appending. 3085 * If a node transitioned to UNDEFINED at t1, its mode is treated 3086 * as the inverse of the group's filter mode. 3087 */ 3088 while (drt != REC_FULL) { 3089 do { 3090 m0 = mbufq_last(mq); 3091 if (m0 != NULL && 3092 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= 3093 IGMP_V3_REPORT_MAXRECS) && 3094 (m0->m_pkthdr.len + MINRECLEN) < 3095 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3096 m = m0; 3097 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3098 sizeof(struct igmp_grouprec)) / 3099 sizeof(in_addr_t); 3100 CTR1(KTR_IGMPV3, 3101 "%s: use previous packet", __func__); 3102 } else { 3103 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3104 if (m) 3105 m->m_data += IGMP_LEADINGSPACE; 3106 if (m == NULL) { 3107 m = m_gethdr(M_NOWAIT, MT_DATA); 3108 if (m) 3109 M_ALIGN(m, IGMP_LEADINGSPACE); 3110 } 3111 if (m == NULL) { 3112 CTR1(KTR_IGMPV3, 3113 "%s: m_get*() failed", __func__); 3114 return (-ENOMEM); 3115 } 3116 m->m_pkthdr.PH_vt.vt_nrecs = 0; 3117 igmp_save_context(m, ifp); 3118 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3119 sizeof(struct igmp_grouprec)) / 3120 sizeof(in_addr_t); 3121 npbytes = 0; 3122 CTR1(KTR_IGMPV3, 3123 "%s: allocated new packet", __func__); 3124 } 3125 /* 3126 * Append the IGMP group record header to the 3127 * current packet's data area. 3128 * Recalculate pointer to free space for next 3129 * group record, in case m_append() allocated 3130 * a new mbuf or cluster. 3131 */ 3132 memset(&ig, 0, sizeof(ig)); 3133 ig.ig_group = inm->inm_addr; 3134 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3135 if (m != m0) 3136 m_freem(m); 3137 CTR1(KTR_IGMPV3, 3138 "%s: m_append() failed", __func__); 3139 return (-ENOMEM); 3140 } 3141 npbytes += sizeof(struct igmp_grouprec); 3142 if (m != m0) { 3143 /* new packet; offset in c hain */ 3144 md = m_getptr(m, npbytes - 3145 sizeof(struct igmp_grouprec), &off); 3146 pig = (struct igmp_grouprec *)(mtod(md, 3147 uint8_t *) + off); 3148 } else { 3149 /* current packet; offset from last append */ 3150 md = m_last(m); 3151 pig = (struct igmp_grouprec *)(mtod(md, 3152 uint8_t *) + md->m_len - 3153 sizeof(struct igmp_grouprec)); 3154 } 3155 /* 3156 * Begin walking the tree for this record type 3157 * pass, or continue from where we left off 3158 * previously if we had to allocate a new packet. 3159 * Only report deltas in-mode at t1. 3160 * We need not report included sources as allowed 3161 * if we are in inclusive mode on the group, 3162 * however the converse is not true. 3163 */ 3164 rsrcs = 0; 3165 if (nims == NULL) 3166 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3167 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3168 CTR2(KTR_IGMPV3, "%s: visit node 0x%08x", 3169 __func__, ims->ims_haddr); 3170 now = ims_get_mode(inm, ims, 1); 3171 then = ims_get_mode(inm, ims, 0); 3172 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3173 __func__, then, now); 3174 if (now == then) { 3175 CTR1(KTR_IGMPV3, 3176 "%s: skip unchanged", __func__); 3177 continue; 3178 } 3179 if (mode == MCAST_EXCLUDE && 3180 now == MCAST_INCLUDE) { 3181 CTR1(KTR_IGMPV3, 3182 "%s: skip IN src on EX group", 3183 __func__); 3184 continue; 3185 } 3186 nrt = (rectype_t)now; 3187 if (nrt == REC_NONE) 3188 nrt = (rectype_t)(~mode & REC_FULL); 3189 if (schanged++ == 0) { 3190 crt = nrt; 3191 } else if (crt != nrt) 3192 continue; 3193 naddr = htonl(ims->ims_haddr); 3194 if (!m_append(m, sizeof(in_addr_t), 3195 (void *)&naddr)) { 3196 if (m != m0) 3197 m_freem(m); 3198 CTR1(KTR_IGMPV3, 3199 "%s: m_append() failed", __func__); 3200 return (-ENOMEM); 3201 } 3202 nallow += !!(crt == REC_ALLOW); 3203 nblock += !!(crt == REC_BLOCK); 3204 if (++rsrcs == m0srcs) 3205 break; 3206 } 3207 /* 3208 * If we did not append any tree nodes on this 3209 * pass, back out of allocations. 3210 */ 3211 if (rsrcs == 0) { 3212 npbytes -= sizeof(struct igmp_grouprec); 3213 if (m != m0) { 3214 CTR1(KTR_IGMPV3, 3215 "%s: m_free(m)", __func__); 3216 m_freem(m); 3217 } else { 3218 CTR1(KTR_IGMPV3, 3219 "%s: m_adj(m, -ig)", __func__); 3220 m_adj(m, -((int)sizeof( 3221 struct igmp_grouprec))); 3222 } 3223 continue; 3224 } 3225 npbytes += (rsrcs * sizeof(in_addr_t)); 3226 if (crt == REC_ALLOW) 3227 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3228 else if (crt == REC_BLOCK) 3229 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3230 pig->ig_numsrc = htons(rsrcs); 3231 /* 3232 * Count the new group record, and enqueue this 3233 * packet if it wasn't already queued. 3234 */ 3235 m->m_pkthdr.PH_vt.vt_nrecs++; 3236 if (m != m0) 3237 mbufq_enqueue(mq, m); 3238 nbytes += npbytes; 3239 } while (nims != NULL); 3240 drt |= crt; 3241 crt = (~crt & REC_FULL); 3242 } 3243 3244 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3245 nallow, nblock); 3246 3247 return (nbytes); 3248 } 3249 3250 static int 3251 igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3252 { 3253 struct mbufq *gq; 3254 struct mbuf *m; /* pending state-change */ 3255 struct mbuf *m0; /* copy of pending state-change */ 3256 struct mbuf *mt; /* last state-change in packet */ 3257 int docopy, domerge; 3258 u_int recslen; 3259 3260 docopy = 0; 3261 domerge = 0; 3262 recslen = 0; 3263 3264 IN_MULTI_LIST_LOCK_ASSERT(); 3265 IGMP_LOCK_ASSERT(); 3266 3267 /* 3268 * If there are further pending retransmissions, make a writable 3269 * copy of each queued state-change message before merging. 3270 */ 3271 if (inm->inm_scrv > 0) 3272 docopy = 1; 3273 3274 gq = &inm->inm_scq; 3275 #ifdef KTR 3276 if (mbufq_first(gq) == NULL) { 3277 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3278 __func__, inm); 3279 } 3280 #endif 3281 3282 m = mbufq_first(gq); 3283 while (m != NULL) { 3284 /* 3285 * Only merge the report into the current packet if 3286 * there is sufficient space to do so; an IGMPv3 report 3287 * packet may only contain 65,535 group records. 3288 * Always use a simple mbuf chain concatentation to do this, 3289 * as large state changes for single groups may have 3290 * allocated clusters. 3291 */ 3292 domerge = 0; 3293 mt = mbufq_last(scq); 3294 if (mt != NULL) { 3295 recslen = m_length(m, NULL); 3296 3297 if ((mt->m_pkthdr.PH_vt.vt_nrecs + 3298 m->m_pkthdr.PH_vt.vt_nrecs <= 3299 IGMP_V3_REPORT_MAXRECS) && 3300 (mt->m_pkthdr.len + recslen <= 3301 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3302 domerge = 1; 3303 } 3304 3305 if (!domerge && mbufq_full(gq)) { 3306 CTR2(KTR_IGMPV3, 3307 "%s: outbound queue full, skipping whole packet %p", 3308 __func__, m); 3309 mt = m->m_nextpkt; 3310 if (!docopy) 3311 m_freem(m); 3312 m = mt; 3313 continue; 3314 } 3315 3316 if (!docopy) { 3317 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3318 m0 = mbufq_dequeue(gq); 3319 m = m0->m_nextpkt; 3320 } else { 3321 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3322 m0 = m_dup(m, M_NOWAIT); 3323 if (m0 == NULL) 3324 return (ENOMEM); 3325 m0->m_nextpkt = NULL; 3326 m = m->m_nextpkt; 3327 } 3328 3329 if (!domerge) { 3330 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3331 __func__, m0, scq); 3332 mbufq_enqueue(scq, m0); 3333 } else { 3334 struct mbuf *mtl; /* last mbuf of packet mt */ 3335 3336 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3337 __func__, m0, mt); 3338 3339 mtl = m_last(mt); 3340 m0->m_flags &= ~M_PKTHDR; 3341 mt->m_pkthdr.len += recslen; 3342 mt->m_pkthdr.PH_vt.vt_nrecs += 3343 m0->m_pkthdr.PH_vt.vt_nrecs; 3344 3345 mtl->m_next = m0; 3346 } 3347 } 3348 3349 return (0); 3350 } 3351 3352 /* 3353 * Respond to a pending IGMPv3 General Query. 3354 */ 3355 static void 3356 igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3357 { 3358 struct ifmultiaddr *ifma; 3359 struct ifnet *ifp; 3360 struct in_multi *inm; 3361 int retval __unused, loop; 3362 3363 IN_MULTI_LIST_LOCK_ASSERT(); 3364 IGMP_LOCK_ASSERT(); 3365 NET_EPOCH_ASSERT(); 3366 3367 KASSERT(igi->igi_version == IGMP_VERSION_3, 3368 ("%s: called when version %d", __func__, igi->igi_version)); 3369 3370 /* 3371 * Check that there are some packets queued. If so, send them first. 3372 * For large number of groups the reply to general query can take 3373 * many packets, we should finish sending them before starting of 3374 * queuing the new reply. 3375 */ 3376 if (mbufq_len(&igi->igi_gq) != 0) 3377 goto send; 3378 3379 ifp = igi->igi_ifp; 3380 3381 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3382 if (ifma->ifma_addr->sa_family != AF_INET || 3383 ifma->ifma_protospec == NULL) 3384 continue; 3385 3386 inm = (struct in_multi *)ifma->ifma_protospec; 3387 KASSERT(ifp == inm->inm_ifp, 3388 ("%s: inconsistent ifp", __func__)); 3389 3390 switch (inm->inm_state) { 3391 case IGMP_NOT_MEMBER: 3392 case IGMP_SILENT_MEMBER: 3393 break; 3394 case IGMP_REPORTING_MEMBER: 3395 case IGMP_IDLE_MEMBER: 3396 case IGMP_LAZY_MEMBER: 3397 case IGMP_SLEEPING_MEMBER: 3398 case IGMP_AWAKENING_MEMBER: 3399 inm->inm_state = IGMP_REPORTING_MEMBER; 3400 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3401 inm, 0, 0, 0); 3402 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3403 __func__, retval); 3404 break; 3405 case IGMP_G_QUERY_PENDING_MEMBER: 3406 case IGMP_SG_QUERY_PENDING_MEMBER: 3407 case IGMP_LEAVING_MEMBER: 3408 break; 3409 } 3410 } 3411 3412 send: 3413 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3414 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3415 3416 /* 3417 * Slew transmission of bursts over 500ms intervals. 3418 */ 3419 if (mbufq_first(&igi->igi_gq) != NULL) { 3420 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3421 IGMP_RESPONSE_BURST_INTERVAL); 3422 V_interface_timers_running = 1; 3423 } 3424 } 3425 3426 /* 3427 * Transmit the next pending IGMP message in the output queue. 3428 * 3429 * We get called from netisr_processqueue(). A mutex private to igmpoq 3430 * will be acquired and released around this routine. 3431 * 3432 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3433 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3434 * a link and uses a link-scope multicast address. 3435 */ 3436 static void 3437 igmp_intr(struct mbuf *m) 3438 { 3439 struct ip_moptions imo; 3440 struct ifnet *ifp; 3441 struct mbuf *ipopts, *m0; 3442 int error; 3443 uint32_t ifindex; 3444 3445 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3446 3447 /* 3448 * Set VNET image pointer from enqueued mbuf chain 3449 * before doing anything else. Whilst we use interface 3450 * indexes to guard against interface detach, they are 3451 * unique to each VIMAGE and must be retrieved. 3452 */ 3453 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3454 ifindex = igmp_restore_context(m); 3455 3456 /* 3457 * Check if the ifnet still exists. This limits the scope of 3458 * any race in the absence of a global ifp lock for low cost 3459 * (an array lookup). 3460 */ 3461 ifp = ifnet_byindex(ifindex); 3462 if (ifp == NULL) { 3463 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3464 __func__, m, ifindex); 3465 m_freem(m); 3466 IPSTAT_INC(ips_noroute); 3467 goto out; 3468 } 3469 3470 ipopts = V_igmp_sendra ? m_raopt : NULL; 3471 3472 imo.imo_multicast_ttl = 1; 3473 imo.imo_multicast_vif = -1; 3474 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3475 3476 /* 3477 * If the user requested that IGMP traffic be explicitly 3478 * redirected to the loopback interface (e.g. they are running a 3479 * MANET interface and the routing protocol needs to see the 3480 * updates), handle this now. 3481 */ 3482 if (m->m_flags & M_IGMP_LOOP) 3483 imo.imo_multicast_ifp = V_loif; 3484 else 3485 imo.imo_multicast_ifp = ifp; 3486 3487 if (m->m_flags & M_IGMPV2) { 3488 m0 = m; 3489 } else { 3490 m0 = igmp_v3_encap_report(ifp, m); 3491 if (m0 == NULL) { 3492 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3493 m_freem(m); 3494 IPSTAT_INC(ips_odropped); 3495 goto out; 3496 } 3497 } 3498 3499 igmp_scrub_context(m0); 3500 m_clrprotoflags(m); 3501 m0->m_pkthdr.rcvif = V_loif; 3502 #ifdef MAC 3503 mac_netinet_igmp_send(ifp, m0); 3504 #endif 3505 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3506 if (error) { 3507 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3508 goto out; 3509 } 3510 3511 IGMPSTAT_INC(igps_snd_reports); 3512 3513 out: 3514 /* 3515 * We must restore the existing vnet pointer before 3516 * continuing as we are run from netisr context. 3517 */ 3518 CURVNET_RESTORE(); 3519 } 3520 3521 /* 3522 * Encapsulate an IGMPv3 report. 3523 * 3524 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3525 * chain has already had its IP/IGMPv3 header prepended. In this case 3526 * the function will not attempt to prepend; the lengths and checksums 3527 * will however be re-computed. 3528 * 3529 * Returns a pointer to the new mbuf chain head, or NULL if the 3530 * allocation failed. 3531 */ 3532 static struct mbuf * 3533 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3534 { 3535 struct igmp_report *igmp; 3536 struct ip *ip; 3537 int hdrlen, igmpreclen; 3538 3539 KASSERT((m->m_flags & M_PKTHDR), 3540 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3541 3542 igmpreclen = m_length(m, NULL); 3543 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); 3544 3545 if (m->m_flags & M_IGMPV3_HDR) { 3546 igmpreclen -= hdrlen; 3547 } else { 3548 M_PREPEND(m, hdrlen, M_NOWAIT); 3549 if (m == NULL) 3550 return (NULL); 3551 m->m_flags |= M_IGMPV3_HDR; 3552 } 3553 3554 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen); 3555 3556 m->m_data += sizeof(struct ip); 3557 m->m_len -= sizeof(struct ip); 3558 3559 igmp = mtod(m, struct igmp_report *); 3560 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; 3561 igmp->ir_rsv1 = 0; 3562 igmp->ir_rsv2 = 0; 3563 igmp->ir_numgrps = htons(m->m_pkthdr.PH_vt.vt_nrecs); 3564 igmp->ir_cksum = 0; 3565 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3566 m->m_pkthdr.PH_vt.vt_nrecs = 0; 3567 3568 m->m_data -= sizeof(struct ip); 3569 m->m_len += sizeof(struct ip); 3570 3571 ip = mtod(m, struct ip *); 3572 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; 3573 ip->ip_len = htons(hdrlen + igmpreclen); 3574 ip->ip_off = htons(IP_DF); 3575 ip->ip_p = IPPROTO_IGMP; 3576 ip->ip_sum = 0; 3577 3578 ip->ip_src.s_addr = INADDR_ANY; 3579 3580 if (m->m_flags & M_IGMP_LOOP) { 3581 struct in_ifaddr *ia; 3582 3583 IFP_TO_IA(ifp, ia); 3584 if (ia != NULL) 3585 ip->ip_src = ia->ia_addr.sin_addr; 3586 } 3587 3588 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); 3589 3590 return (m); 3591 } 3592 3593 #ifdef KTR 3594 static char * 3595 igmp_rec_type_to_str(const int type) 3596 { 3597 3598 switch (type) { 3599 case IGMP_CHANGE_TO_EXCLUDE_MODE: 3600 return "TO_EX"; 3601 break; 3602 case IGMP_CHANGE_TO_INCLUDE_MODE: 3603 return "TO_IN"; 3604 break; 3605 case IGMP_MODE_IS_EXCLUDE: 3606 return "MODE_EX"; 3607 break; 3608 case IGMP_MODE_IS_INCLUDE: 3609 return "MODE_IN"; 3610 break; 3611 case IGMP_ALLOW_NEW_SOURCES: 3612 return "ALLOW_NEW"; 3613 break; 3614 case IGMP_BLOCK_OLD_SOURCES: 3615 return "BLOCK_OLD"; 3616 break; 3617 default: 3618 break; 3619 } 3620 return "unknown"; 3621 } 3622 #endif 3623 3624 #ifdef VIMAGE 3625 static void 3626 vnet_igmp_init(const void *unused __unused) 3627 { 3628 3629 netisr_register_vnet(&igmp_nh); 3630 } 3631 VNET_SYSINIT(vnet_igmp_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3632 vnet_igmp_init, NULL); 3633 3634 static void 3635 vnet_igmp_uninit(const void *unused __unused) 3636 { 3637 3638 /* This can happen when we shutdown the entire network stack. */ 3639 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3640 3641 netisr_unregister_vnet(&igmp_nh); 3642 } 3643 VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3644 vnet_igmp_uninit, NULL); 3645 #endif 3646 3647 #ifdef DDB 3648 DB_SHOW_COMMAND(igi_list, db_show_igi_list) 3649 { 3650 struct igmp_ifsoftc *igi, *tigi; 3651 LIST_HEAD(_igi_list, igmp_ifsoftc) *igi_head; 3652 3653 if (!have_addr) { 3654 db_printf("usage: show igi_list <addr>\n"); 3655 return; 3656 } 3657 igi_head = (struct _igi_list *)addr; 3658 3659 LIST_FOREACH_SAFE(igi, igi_head, igi_link, tigi) { 3660 db_printf("igmp_ifsoftc %p:\n", igi); 3661 db_printf(" ifp %p\n", igi->igi_ifp); 3662 db_printf(" version %u\n", igi->igi_version); 3663 db_printf(" v1_timer %u\n", igi->igi_v1_timer); 3664 db_printf(" v2_timer %u\n", igi->igi_v2_timer); 3665 db_printf(" v3_timer %u\n", igi->igi_v3_timer); 3666 db_printf(" flags %#x\n", igi->igi_flags); 3667 db_printf(" rv %u\n", igi->igi_rv); 3668 db_printf(" qi %u\n", igi->igi_qi); 3669 db_printf(" qri %u\n", igi->igi_qri); 3670 db_printf(" uri %u\n", igi->igi_uri); 3671 /* struct mbufq igi_gq; */ 3672 db_printf("\n"); 3673 } 3674 } 3675 #endif 3676 3677 static int 3678 igmp_modevent(module_t mod, int type, void *unused __unused) 3679 { 3680 3681 switch (type) { 3682 case MOD_LOAD: 3683 CTR1(KTR_IGMPV3, "%s: initializing", __func__); 3684 IGMP_LOCK_INIT(); 3685 m_raopt = igmp_ra_alloc(); 3686 netisr_register(&igmp_nh); 3687 break; 3688 case MOD_UNLOAD: 3689 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3690 netisr_unregister(&igmp_nh); 3691 m_free(m_raopt); 3692 m_raopt = NULL; 3693 IGMP_LOCK_DESTROY(); 3694 break; 3695 default: 3696 return (EOPNOTSUPP); 3697 } 3698 return (0); 3699 } 3700 3701 static moduledata_t igmp_mod = { 3702 "igmp", 3703 igmp_modevent, 3704 0 3705 }; 3706 DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE); 3707