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