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