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 * 3. 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_ddb.h" 54 55 #include <sys/param.h> 56 #include <sys/systm.h> 57 #include <sys/module.h> 58 #include <sys/malloc.h> 59 #include <sys/mbuf.h> 60 #include <sys/socket.h> 61 #include <sys/protosw.h> 62 #include <sys/kernel.h> 63 #include <sys/lock.h> 64 #include <sys/rmlock.h> 65 #include <sys/sysctl.h> 66 #include <sys/ktr.h> 67 #include <sys/condvar.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #endif 72 73 #include <net/if.h> 74 #include <net/if_var.h> 75 #include <net/netisr.h> 76 #include <net/vnet.h> 77 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 #include <netinet/in_systm.h> 81 #include <netinet/ip.h> 82 #include <netinet/ip_var.h> 83 #include <netinet/ip_options.h> 84 #include <netinet/igmp.h> 85 #include <netinet/igmp_var.h> 86 87 #include <machine/in_cksum.h> 88 89 #include <security/mac/mac_framework.h> 90 91 #ifndef KTR_IGMPV3 92 #define KTR_IGMPV3 KTR_INET 93 #endif 94 95 static struct igmp_ifsoftc * 96 igi_alloc_locked(struct ifnet *); 97 static void igi_delete_locked(const struct ifnet *); 98 static void igmp_dispatch_queue(struct mbufq *, int, const int); 99 static void igmp_fasttimo_vnet(void); 100 static void igmp_final_leave(struct in_multi *, struct igmp_ifsoftc *); 101 static int igmp_handle_state_change(struct in_multi *, 102 struct igmp_ifsoftc *); 103 static int igmp_initial_join(struct in_multi *, struct igmp_ifsoftc *); 104 static int igmp_input_v1_query(struct ifnet *, const struct ip *, 105 const struct igmp *); 106 static int igmp_input_v2_query(struct ifnet *, const struct ip *, 107 const struct igmp *); 108 static int igmp_input_v3_query(struct ifnet *, const struct ip *, 109 /*const*/ struct igmpv3 *); 110 static int igmp_input_v3_group_query(struct in_multi *, 111 struct igmp_ifsoftc *, int, /*const*/ struct igmpv3 *); 112 static int igmp_input_v1_report(struct ifnet *, /*const*/ struct ip *, 113 /*const*/ struct igmp *); 114 static int igmp_input_v2_report(struct ifnet *, /*const*/ struct ip *, 115 /*const*/ struct igmp *); 116 static void igmp_intr(struct mbuf *); 117 static int igmp_isgroupreported(const struct in_addr); 118 static struct mbuf * 119 igmp_ra_alloc(void); 120 #ifdef KTR 121 static char * igmp_rec_type_to_str(const int); 122 #endif 123 static void igmp_set_version(struct igmp_ifsoftc *, const int); 124 static void igmp_slowtimo_vnet(void); 125 static int igmp_v1v2_queue_report(struct in_multi *, const int); 126 static void igmp_v1v2_process_group_timer(struct in_multi *, const int); 127 static void igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *); 128 static void igmp_v2_update_group(struct in_multi *, const int); 129 static void igmp_v3_cancel_link_timers(struct igmp_ifsoftc *); 130 static void igmp_v3_dispatch_general_query(struct igmp_ifsoftc *); 131 static struct mbuf * 132 igmp_v3_encap_report(struct ifnet *, struct mbuf *); 133 static int igmp_v3_enqueue_group_record(struct mbufq *, 134 struct in_multi *, const int, const int, const int); 135 static int igmp_v3_enqueue_filter_change(struct mbufq *, 136 struct in_multi *); 137 static void igmp_v3_process_group_timers(struct igmp_ifsoftc *, 138 struct mbufq *, struct mbufq *, struct in_multi *, 139 const int); 140 static int igmp_v3_merge_state_changes(struct in_multi *, 141 struct mbufq *); 142 static void igmp_v3_suppress_group_record(struct in_multi *); 143 static int sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS); 144 static int sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS); 145 static int sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS); 146 147 static const struct netisr_handler igmp_nh = { 148 .nh_name = "igmp", 149 .nh_handler = igmp_intr, 150 .nh_proto = NETISR_IGMP, 151 .nh_policy = NETISR_POLICY_SOURCE, 152 }; 153 154 /* 155 * System-wide globals. 156 * 157 * Unlocked access to these is OK, except for the global IGMP output 158 * queue. The IGMP subsystem lock ends up being system-wide for the moment, 159 * because all VIMAGEs have to share a global output queue, as netisrs 160 * themselves are not virtualized. 161 * 162 * Locking: 163 * * The permitted lock order is: IN_MULTI_LOCK, IGMP_LOCK, IF_ADDR_LOCK. 164 * Any may be taken independently; if any are held at the same 165 * time, the above lock order must be followed. 166 * * All output is delegated to the netisr. 167 * Now that Giant has been eliminated, the netisr may be inlined. 168 * * IN_MULTI_LOCK covers in_multi. 169 * * IGMP_LOCK covers igmp_ifsoftc and any global variables in this file, 170 * including the output queue. 171 * * IF_ADDR_LOCK covers if_multiaddrs, which is used for a variety of 172 * per-link state iterators. 173 * * igmp_ifsoftc is valid as long as PF_INET is attached to the interface, 174 * therefore it is not refcounted. 175 * We allow unlocked reads of igmp_ifsoftc when accessed via in_multi. 176 * 177 * Reference counting 178 * * IGMP acquires its own reference every time an in_multi is passed to 179 * it and the group is being joined for the first time. 180 * * IGMP releases its reference(s) on in_multi in a deferred way, 181 * because the operations which process the release run as part of 182 * a loop whose control variables are directly affected by the release 183 * (that, and not recursing on the IF_ADDR_LOCK). 184 * 185 * VIMAGE: Each in_multi corresponds to an ifp, and each ifp corresponds 186 * to a vnet in ifp->if_vnet. 187 * 188 * SMPng: XXX We may potentially race operations on ifma_protospec. 189 * The problem is that we currently lack a clean way of taking the 190 * IF_ADDR_LOCK() between the ifnet and in layers w/o recursing, 191 * as anything which modifies ifma needs to be covered by that lock. 192 * So check for ifma_protospec being NULL before proceeding. 193 */ 194 struct mtx igmp_mtx; 195 196 struct mbuf *m_raopt; /* Router Alert option */ 197 static MALLOC_DEFINE(M_IGMP, "igmp", "igmp state"); 198 199 /* 200 * VIMAGE-wide globals. 201 * 202 * The IGMPv3 timers themselves need to run per-image, however, 203 * protosw timers run globally (see tcp). 204 * An ifnet can only be in one vimage at a time, and the loopback 205 * ifnet, loif, is itself virtualized. 206 * It would otherwise be possible to seriously hose IGMP state, 207 * and create inconsistencies in upstream multicast routing, if you have 208 * multiple VIMAGEs running on the same link joining different multicast 209 * groups, UNLESS the "primary IP address" is different. This is because 210 * IGMP for IPv4 does not force link-local addresses to be used for each 211 * node, unlike MLD for IPv6. 212 * Obviously the IGMPv3 per-interface state has per-vimage granularity 213 * also as a result. 214 * 215 * FUTURE: Stop using IFP_TO_IA/INADDR_ANY, and use source address selection 216 * policy to control the address used by IGMP on the link. 217 */ 218 static VNET_DEFINE(int, interface_timers_running); /* IGMPv3 general 219 * query response */ 220 static VNET_DEFINE(int, state_change_timers_running); /* IGMPv3 state-change 221 * retransmit */ 222 static VNET_DEFINE(int, current_state_timers_running); /* IGMPv1/v2 host 223 * report; IGMPv3 g/sg 224 * query response */ 225 226 #define V_interface_timers_running VNET(interface_timers_running) 227 #define V_state_change_timers_running VNET(state_change_timers_running) 228 #define V_current_state_timers_running VNET(current_state_timers_running) 229 230 static VNET_DEFINE(LIST_HEAD(, igmp_ifsoftc), igi_head) = 231 LIST_HEAD_INITIALIZER(igi_head); 232 static VNET_DEFINE(struct igmpstat, igmpstat) = { 233 .igps_version = IGPS_VERSION_3, 234 .igps_len = sizeof(struct igmpstat), 235 }; 236 static VNET_DEFINE(struct timeval, igmp_gsrdelay) = {10, 0}; 237 238 #define V_igi_head VNET(igi_head) 239 #define V_igmpstat VNET(igmpstat) 240 #define V_igmp_gsrdelay VNET(igmp_gsrdelay) 241 242 static VNET_DEFINE(int, igmp_recvifkludge) = 1; 243 static VNET_DEFINE(int, igmp_sendra) = 1; 244 static VNET_DEFINE(int, igmp_sendlocal) = 1; 245 static VNET_DEFINE(int, igmp_v1enable) = 1; 246 static VNET_DEFINE(int, igmp_v2enable) = 1; 247 static VNET_DEFINE(int, igmp_legacysupp); 248 static VNET_DEFINE(int, igmp_default_version) = IGMP_VERSION_3; 249 250 #define V_igmp_recvifkludge VNET(igmp_recvifkludge) 251 #define V_igmp_sendra VNET(igmp_sendra) 252 #define V_igmp_sendlocal VNET(igmp_sendlocal) 253 #define V_igmp_v1enable VNET(igmp_v1enable) 254 #define V_igmp_v2enable VNET(igmp_v2enable) 255 #define V_igmp_legacysupp VNET(igmp_legacysupp) 256 #define V_igmp_default_version VNET(igmp_default_version) 257 258 /* 259 * Virtualized sysctls. 260 */ 261 SYSCTL_STRUCT(_net_inet_igmp, IGMPCTL_STATS, stats, CTLFLAG_VNET | CTLFLAG_RW, 262 &VNET_NAME(igmpstat), igmpstat, ""); 263 SYSCTL_INT(_net_inet_igmp, OID_AUTO, recvifkludge, CTLFLAG_VNET | CTLFLAG_RW, 264 &VNET_NAME(igmp_recvifkludge), 0, 265 "Rewrite IGMPv1/v2 reports from 0.0.0.0 to contain subnet address"); 266 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendra, CTLFLAG_VNET | CTLFLAG_RW, 267 &VNET_NAME(igmp_sendra), 0, 268 "Send IP Router Alert option in IGMPv2/v3 messages"); 269 SYSCTL_INT(_net_inet_igmp, OID_AUTO, sendlocal, CTLFLAG_VNET | CTLFLAG_RW, 270 &VNET_NAME(igmp_sendlocal), 0, 271 "Send IGMP membership reports for 224.0.0.0/24 groups"); 272 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v1enable, CTLFLAG_VNET | CTLFLAG_RW, 273 &VNET_NAME(igmp_v1enable), 0, 274 "Enable backwards compatibility with IGMPv1"); 275 SYSCTL_INT(_net_inet_igmp, OID_AUTO, v2enable, CTLFLAG_VNET | CTLFLAG_RW, 276 &VNET_NAME(igmp_v2enable), 0, 277 "Enable backwards compatibility with IGMPv2"); 278 SYSCTL_INT(_net_inet_igmp, OID_AUTO, legacysupp, CTLFLAG_VNET | CTLFLAG_RW, 279 &VNET_NAME(igmp_legacysupp), 0, 280 "Allow v1/v2 reports to suppress v3 group responses"); 281 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, default_version, 282 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 283 &VNET_NAME(igmp_default_version), 0, sysctl_igmp_default_version, "I", 284 "Default version of IGMP to run on each interface"); 285 SYSCTL_PROC(_net_inet_igmp, OID_AUTO, gsrdelay, 286 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 287 &VNET_NAME(igmp_gsrdelay.tv_sec), 0, sysctl_igmp_gsr, "I", 288 "Rate limit for IGMPv3 Group-and-Source queries in seconds"); 289 290 /* 291 * Non-virtualized sysctls. 292 */ 293 static SYSCTL_NODE(_net_inet_igmp, OID_AUTO, ifinfo, 294 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_igmp_ifinfo, 295 "Per-interface IGMPv3 state"); 296 297 static __inline void 298 igmp_save_context(struct mbuf *m, struct ifnet *ifp) 299 { 300 301 #ifdef VIMAGE 302 m->m_pkthdr.PH_loc.ptr = ifp->if_vnet; 303 #endif /* VIMAGE */ 304 m->m_pkthdr.flowid = ifp->if_index; 305 } 306 307 static __inline void 308 igmp_scrub_context(struct mbuf *m) 309 { 310 311 m->m_pkthdr.PH_loc.ptr = NULL; 312 m->m_pkthdr.flowid = 0; 313 } 314 315 #ifdef KTR 316 static __inline char * 317 inet_ntoa_haddr(in_addr_t haddr, char *addrbuf) 318 { 319 struct in_addr ia; 320 321 ia.s_addr = htonl(haddr); 322 return (inet_ntoa_r(ia, addrbuf)); 323 } 324 #endif 325 326 /* 327 * Restore context from a queued IGMP output chain. 328 * Return saved ifindex. 329 * 330 * VIMAGE: The assertion is there to make sure that we 331 * actually called CURVNET_SET() with what's in the mbuf chain. 332 */ 333 static __inline uint32_t 334 igmp_restore_context(struct mbuf *m) 335 { 336 337 #ifdef notyet 338 #if defined(VIMAGE) && defined(INVARIANTS) 339 KASSERT(curvnet == (m->m_pkthdr.PH_loc.ptr), 340 ("%s: called when curvnet was not restored", __func__)); 341 #endif 342 #endif 343 return (m->m_pkthdr.flowid); 344 } 345 346 /* 347 * Retrieve or set default IGMP version. 348 * 349 * VIMAGE: Assume curvnet set by caller. 350 * SMPng: NOTE: Serialized by IGMP lock. 351 */ 352 static int 353 sysctl_igmp_default_version(SYSCTL_HANDLER_ARGS) 354 { 355 int error; 356 int new; 357 358 error = sysctl_wire_old_buffer(req, sizeof(int)); 359 if (error) 360 return (error); 361 362 IGMP_LOCK(); 363 364 new = V_igmp_default_version; 365 366 error = sysctl_handle_int(oidp, &new, 0, req); 367 if (error || !req->newptr) 368 goto out_locked; 369 370 if (new < IGMP_VERSION_1 || new > IGMP_VERSION_3) { 371 error = EINVAL; 372 goto out_locked; 373 } 374 375 CTR2(KTR_IGMPV3, "change igmp_default_version from %d to %d", 376 V_igmp_default_version, new); 377 378 V_igmp_default_version = new; 379 380 out_locked: 381 IGMP_UNLOCK(); 382 return (error); 383 } 384 385 /* 386 * Retrieve or set threshold between group-source queries in seconds. 387 * 388 * VIMAGE: Assume curvnet set by caller. 389 * SMPng: NOTE: Serialized by IGMP lock. 390 */ 391 static int 392 sysctl_igmp_gsr(SYSCTL_HANDLER_ARGS) 393 { 394 int error; 395 int i; 396 397 error = sysctl_wire_old_buffer(req, sizeof(int)); 398 if (error) 399 return (error); 400 401 IGMP_LOCK(); 402 403 i = V_igmp_gsrdelay.tv_sec; 404 405 error = sysctl_handle_int(oidp, &i, 0, req); 406 if (error || !req->newptr) 407 goto out_locked; 408 409 if (i < -1 || i >= 60) { 410 error = EINVAL; 411 goto out_locked; 412 } 413 414 CTR2(KTR_IGMPV3, "change igmp_gsrdelay from %d to %d", 415 V_igmp_gsrdelay.tv_sec, i); 416 V_igmp_gsrdelay.tv_sec = i; 417 418 out_locked: 419 IGMP_UNLOCK(); 420 return (error); 421 } 422 423 /* 424 * Expose struct igmp_ifsoftc to userland, keyed by ifindex. 425 * For use by ifmcstat(8). 426 * 427 * SMPng: NOTE: Does an unlocked ifindex space read. 428 * VIMAGE: Assume curvnet set by caller. The node handler itself 429 * is not directly virtualized. 430 */ 431 static int 432 sysctl_igmp_ifinfo(SYSCTL_HANDLER_ARGS) 433 { 434 int *name; 435 int error; 436 u_int namelen; 437 struct ifnet *ifp; 438 struct igmp_ifsoftc *igi; 439 440 name = (int *)arg1; 441 namelen = arg2; 442 443 if (req->newptr != NULL) 444 return (EPERM); 445 446 if (namelen != 1) 447 return (EINVAL); 448 449 error = sysctl_wire_old_buffer(req, sizeof(struct igmp_ifinfo)); 450 if (error) 451 return (error); 452 453 IN_MULTI_LOCK(); 454 IGMP_LOCK(); 455 456 if (name[0] <= 0 || name[0] > V_if_index) { 457 error = ENOENT; 458 goto out_locked; 459 } 460 461 error = ENOENT; 462 463 ifp = ifnet_byindex(name[0]); 464 if (ifp == NULL) 465 goto out_locked; 466 467 LIST_FOREACH(igi, &V_igi_head, igi_link) { 468 if (ifp == igi->igi_ifp) { 469 struct igmp_ifinfo info; 470 471 info.igi_version = igi->igi_version; 472 info.igi_v1_timer = igi->igi_v1_timer; 473 info.igi_v2_timer = igi->igi_v2_timer; 474 info.igi_v3_timer = igi->igi_v3_timer; 475 info.igi_flags = igi->igi_flags; 476 info.igi_rv = igi->igi_rv; 477 info.igi_qi = igi->igi_qi; 478 info.igi_qri = igi->igi_qri; 479 info.igi_uri = igi->igi_uri; 480 error = SYSCTL_OUT(req, &info, sizeof(info)); 481 break; 482 } 483 } 484 485 out_locked: 486 IGMP_UNLOCK(); 487 IN_MULTI_UNLOCK(); 488 return (error); 489 } 490 491 /* 492 * Dispatch an entire queue of pending packet chains 493 * using the netisr. 494 * VIMAGE: Assumes the vnet pointer has been set. 495 */ 496 static void 497 igmp_dispatch_queue(struct mbufq *mq, int limit, const int loop) 498 { 499 struct mbuf *m; 500 501 while ((m = mbufq_dequeue(mq)) != NULL) { 502 CTR3(KTR_IGMPV3, "%s: dispatch %p from %p", __func__, mq, m); 503 if (loop) 504 m->m_flags |= M_IGMP_LOOP; 505 netisr_dispatch(NETISR_IGMP, m); 506 if (--limit == 0) 507 break; 508 } 509 } 510 511 /* 512 * Filter outgoing IGMP report state by group. 513 * 514 * Reports are ALWAYS suppressed for ALL-HOSTS (224.0.0.1). 515 * If the net.inet.igmp.sendlocal sysctl is 0, then IGMP reports are 516 * disabled for all groups in the 224.0.0.0/24 link-local scope. However, 517 * this may break certain IGMP snooping switches which rely on the old 518 * report behaviour. 519 * 520 * Return zero if the given group is one for which IGMP reports 521 * should be suppressed, or non-zero if reports should be issued. 522 */ 523 static __inline int 524 igmp_isgroupreported(const struct in_addr addr) 525 { 526 527 if (in_allhosts(addr) || 528 ((!V_igmp_sendlocal && IN_LOCAL_GROUP(ntohl(addr.s_addr))))) 529 return (0); 530 531 return (1); 532 } 533 534 /* 535 * Construct a Router Alert option to use in outgoing packets. 536 */ 537 static struct mbuf * 538 igmp_ra_alloc(void) 539 { 540 struct mbuf *m; 541 struct ipoption *p; 542 543 m = m_get(M_WAITOK, MT_DATA); 544 p = mtod(m, struct ipoption *); 545 p->ipopt_dst.s_addr = INADDR_ANY; 546 p->ipopt_list[0] = (char)IPOPT_RA; /* Router Alert Option */ 547 p->ipopt_list[1] = 0x04; /* 4 bytes long */ 548 p->ipopt_list[2] = IPOPT_EOL; /* End of IP option list */ 549 p->ipopt_list[3] = 0x00; /* pad byte */ 550 m->m_len = sizeof(p->ipopt_dst) + p->ipopt_list[1]; 551 552 return (m); 553 } 554 555 /* 556 * Attach IGMP when PF_INET is attached to an interface. 557 */ 558 struct igmp_ifsoftc * 559 igmp_domifattach(struct ifnet *ifp) 560 { 561 struct igmp_ifsoftc *igi; 562 563 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 564 __func__, ifp, ifp->if_xname); 565 566 IGMP_LOCK(); 567 568 igi = igi_alloc_locked(ifp); 569 if (!(ifp->if_flags & IFF_MULTICAST)) 570 igi->igi_flags |= IGIF_SILENT; 571 572 IGMP_UNLOCK(); 573 574 return (igi); 575 } 576 577 /* 578 * VIMAGE: assume curvnet set by caller. 579 */ 580 static struct igmp_ifsoftc * 581 igi_alloc_locked(/*const*/ struct ifnet *ifp) 582 { 583 struct igmp_ifsoftc *igi; 584 585 IGMP_LOCK_ASSERT(); 586 587 igi = malloc(sizeof(struct igmp_ifsoftc), M_IGMP, M_NOWAIT|M_ZERO); 588 if (igi == NULL) 589 goto out; 590 591 igi->igi_ifp = ifp; 592 igi->igi_version = V_igmp_default_version; 593 igi->igi_flags = 0; 594 igi->igi_rv = IGMP_RV_INIT; 595 igi->igi_qi = IGMP_QI_INIT; 596 igi->igi_qri = IGMP_QRI_INIT; 597 igi->igi_uri = IGMP_URI_INIT; 598 SLIST_INIT(&igi->igi_relinmhead); 599 mbufq_init(&igi->igi_gq, IGMP_MAX_RESPONSE_PACKETS); 600 601 LIST_INSERT_HEAD(&V_igi_head, igi, igi_link); 602 603 CTR2(KTR_IGMPV3, "allocate igmp_ifsoftc for ifp %p(%s)", 604 ifp, ifp->if_xname); 605 606 out: 607 return (igi); 608 } 609 610 /* 611 * Hook for ifdetach. 612 * 613 * NOTE: Some finalization tasks need to run before the protocol domain 614 * is detached, but also before the link layer does its cleanup. 615 * 616 * SMPNG: igmp_ifdetach() needs to take IF_ADDR_LOCK(). 617 * XXX This is also bitten by unlocked ifma_protospec access. 618 */ 619 void 620 igmp_ifdetach(struct ifnet *ifp) 621 { 622 struct igmp_ifsoftc *igi; 623 struct ifmultiaddr *ifma; 624 struct in_multi *inm, *tinm; 625 626 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", __func__, ifp, 627 ifp->if_xname); 628 629 IGMP_LOCK(); 630 631 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 632 if (igi->igi_version == IGMP_VERSION_3) { 633 IF_ADDR_RLOCK(ifp); 634 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 635 if (ifma->ifma_addr->sa_family != AF_INET || 636 ifma->ifma_protospec == NULL) 637 continue; 638 #if 0 639 KASSERT(ifma->ifma_protospec != NULL, 640 ("%s: ifma_protospec is NULL", __func__)); 641 #endif 642 inm = (struct in_multi *)ifma->ifma_protospec; 643 if (inm->inm_state == IGMP_LEAVING_MEMBER) { 644 SLIST_INSERT_HEAD(&igi->igi_relinmhead, 645 inm, inm_nrele); 646 } 647 inm_clear_recorded(inm); 648 } 649 IF_ADDR_RUNLOCK(ifp); 650 /* 651 * Free the in_multi reference(s) for this IGMP lifecycle. 652 */ 653 SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, inm_nrele, 654 tinm) { 655 SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele); 656 inm_release_locked(inm); 657 } 658 } 659 660 IGMP_UNLOCK(); 661 } 662 663 /* 664 * Hook for domifdetach. 665 */ 666 void 667 igmp_domifdetach(struct ifnet *ifp) 668 { 669 670 CTR3(KTR_IGMPV3, "%s: called for ifp %p(%s)", 671 __func__, ifp, ifp->if_xname); 672 673 IGMP_LOCK(); 674 igi_delete_locked(ifp); 675 IGMP_UNLOCK(); 676 } 677 678 static void 679 igi_delete_locked(const struct ifnet *ifp) 680 { 681 struct igmp_ifsoftc *igi, *tigi; 682 683 CTR3(KTR_IGMPV3, "%s: freeing igmp_ifsoftc for ifp %p(%s)", 684 __func__, ifp, ifp->if_xname); 685 686 IGMP_LOCK_ASSERT(); 687 688 LIST_FOREACH_SAFE(igi, &V_igi_head, igi_link, tigi) { 689 if (igi->igi_ifp == ifp) { 690 /* 691 * Free deferred General Query responses. 692 */ 693 mbufq_drain(&igi->igi_gq); 694 695 LIST_REMOVE(igi, igi_link); 696 697 KASSERT(SLIST_EMPTY(&igi->igi_relinmhead), 698 ("%s: there are dangling in_multi references", 699 __func__)); 700 701 free(igi, M_IGMP); 702 return; 703 } 704 } 705 } 706 707 /* 708 * Process a received IGMPv1 query. 709 * Return non-zero if the message should be dropped. 710 * 711 * VIMAGE: The curvnet pointer is derived from the input ifp. 712 */ 713 static int 714 igmp_input_v1_query(struct ifnet *ifp, const struct ip *ip, 715 const struct igmp *igmp) 716 { 717 struct ifmultiaddr *ifma; 718 struct igmp_ifsoftc *igi; 719 struct in_multi *inm; 720 721 /* 722 * IGMPv1 Host Mmembership Queries SHOULD always be addressed to 723 * 224.0.0.1. They are always treated as General Queries. 724 * igmp_group is always ignored. Do not drop it as a userland 725 * daemon may wish to see it. 726 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 727 */ 728 if (!in_allhosts(ip->ip_dst) || !in_nullhost(igmp->igmp_group)) { 729 IGMPSTAT_INC(igps_rcv_badqueries); 730 return (0); 731 } 732 IGMPSTAT_INC(igps_rcv_gen_queries); 733 734 IN_MULTI_LOCK(); 735 IGMP_LOCK(); 736 737 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 738 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 739 740 if (igi->igi_flags & IGIF_LOOPBACK) { 741 CTR2(KTR_IGMPV3, "ignore v1 query on IGIF_LOOPBACK ifp %p(%s)", 742 ifp, ifp->if_xname); 743 goto out_locked; 744 } 745 746 /* 747 * Switch to IGMPv1 host compatibility mode. 748 */ 749 igmp_set_version(igi, IGMP_VERSION_1); 750 751 CTR2(KTR_IGMPV3, "process v1 query on ifp %p(%s)", ifp, ifp->if_xname); 752 753 /* 754 * Start the timers in all of our group records 755 * for the interface on which the query arrived, 756 * except those which are already running. 757 */ 758 IF_ADDR_RLOCK(ifp); 759 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 760 if (ifma->ifma_addr->sa_family != AF_INET || 761 ifma->ifma_protospec == NULL) 762 continue; 763 inm = (struct in_multi *)ifma->ifma_protospec; 764 if (inm->inm_timer != 0) 765 continue; 766 switch (inm->inm_state) { 767 case IGMP_NOT_MEMBER: 768 case IGMP_SILENT_MEMBER: 769 break; 770 case IGMP_G_QUERY_PENDING_MEMBER: 771 case IGMP_SG_QUERY_PENDING_MEMBER: 772 case IGMP_REPORTING_MEMBER: 773 case IGMP_IDLE_MEMBER: 774 case IGMP_LAZY_MEMBER: 775 case IGMP_SLEEPING_MEMBER: 776 case IGMP_AWAKENING_MEMBER: 777 inm->inm_state = IGMP_REPORTING_MEMBER; 778 inm->inm_timer = IGMP_RANDOM_DELAY( 779 IGMP_V1V2_MAX_RI * PR_FASTHZ); 780 V_current_state_timers_running = 1; 781 break; 782 case IGMP_LEAVING_MEMBER: 783 break; 784 } 785 } 786 IF_ADDR_RUNLOCK(ifp); 787 788 out_locked: 789 IGMP_UNLOCK(); 790 IN_MULTI_UNLOCK(); 791 792 return (0); 793 } 794 795 /* 796 * Process a received IGMPv2 general or group-specific query. 797 */ 798 static int 799 igmp_input_v2_query(struct ifnet *ifp, const struct ip *ip, 800 const struct igmp *igmp) 801 { 802 struct ifmultiaddr *ifma; 803 struct igmp_ifsoftc *igi; 804 struct in_multi *inm; 805 int is_general_query; 806 uint16_t timer; 807 #ifdef KTR 808 char addrbuf[INET_ADDRSTRLEN]; 809 #endif 810 811 is_general_query = 0; 812 813 /* 814 * Validate address fields upfront. 815 * XXX SMPng: unlocked increments in igmpstat assumed atomic. 816 */ 817 if (in_nullhost(igmp->igmp_group)) { 818 /* 819 * IGMPv2 General Query. 820 * If this was not sent to the all-hosts group, ignore it. 821 */ 822 if (!in_allhosts(ip->ip_dst)) 823 return (0); 824 IGMPSTAT_INC(igps_rcv_gen_queries); 825 is_general_query = 1; 826 } else { 827 /* IGMPv2 Group-Specific Query. */ 828 IGMPSTAT_INC(igps_rcv_group_queries); 829 } 830 831 IN_MULTI_LOCK(); 832 IGMP_LOCK(); 833 834 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 835 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 836 837 if (igi->igi_flags & IGIF_LOOPBACK) { 838 CTR2(KTR_IGMPV3, "ignore v2 query on IGIF_LOOPBACK ifp %p(%s)", 839 ifp, ifp->if_xname); 840 goto out_locked; 841 } 842 843 /* 844 * Ignore v2 query if in v1 Compatibility Mode. 845 */ 846 if (igi->igi_version == IGMP_VERSION_1) 847 goto out_locked; 848 849 igmp_set_version(igi, IGMP_VERSION_2); 850 851 timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE; 852 if (timer == 0) 853 timer = 1; 854 855 if (is_general_query) { 856 /* 857 * For each reporting group joined on this 858 * interface, kick the report timer. 859 */ 860 CTR2(KTR_IGMPV3, "process v2 general query on ifp %p(%s)", 861 ifp, ifp->if_xname); 862 IF_ADDR_RLOCK(ifp); 863 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 864 if (ifma->ifma_addr->sa_family != AF_INET || 865 ifma->ifma_protospec == NULL) 866 continue; 867 inm = (struct in_multi *)ifma->ifma_protospec; 868 igmp_v2_update_group(inm, timer); 869 } 870 IF_ADDR_RUNLOCK(ifp); 871 } else { 872 /* 873 * Group-specific IGMPv2 query, we need only 874 * look up the single group to process it. 875 */ 876 inm = inm_lookup(ifp, igmp->igmp_group); 877 if (inm != NULL) { 878 CTR3(KTR_IGMPV3, "process v2 query %s on ifp %p(%s)", 879 inet_ntoa_r(igmp->igmp_group, addrbuf), ifp, 880 ifp->if_xname); 881 igmp_v2_update_group(inm, timer); 882 } 883 } 884 885 out_locked: 886 IGMP_UNLOCK(); 887 IN_MULTI_UNLOCK(); 888 889 return (0); 890 } 891 892 /* 893 * Update the report timer on a group in response to an IGMPv2 query. 894 * 895 * If we are becoming the reporting member for this group, start the timer. 896 * If we already are the reporting member for this group, and timer is 897 * below the threshold, reset it. 898 * 899 * We may be updating the group for the first time since we switched 900 * to IGMPv3. If we are, then we must clear any recorded source lists, 901 * and transition to REPORTING state; the group timer is overloaded 902 * for group and group-source query responses. 903 * 904 * Unlike IGMPv3, the delay per group should be jittered 905 * to avoid bursts of IGMPv2 reports. 906 */ 907 static void 908 igmp_v2_update_group(struct in_multi *inm, const int timer) 909 { 910 #ifdef KTR 911 char addrbuf[INET_ADDRSTRLEN]; 912 #endif 913 914 CTR4(KTR_IGMPV3, "%s: %s/%s timer=%d", __func__, 915 inet_ntoa_r(inm->inm_addr, addrbuf), inm->inm_ifp->if_xname, timer); 916 917 IN_MULTI_LOCK_ASSERT(); 918 919 switch (inm->inm_state) { 920 case IGMP_NOT_MEMBER: 921 case IGMP_SILENT_MEMBER: 922 break; 923 case IGMP_REPORTING_MEMBER: 924 if (inm->inm_timer != 0 && 925 inm->inm_timer <= timer) { 926 CTR1(KTR_IGMPV3, "%s: REPORTING and timer running, " 927 "skipping.", __func__); 928 break; 929 } 930 /* FALLTHROUGH */ 931 case IGMP_SG_QUERY_PENDING_MEMBER: 932 case IGMP_G_QUERY_PENDING_MEMBER: 933 case IGMP_IDLE_MEMBER: 934 case IGMP_LAZY_MEMBER: 935 case IGMP_AWAKENING_MEMBER: 936 CTR1(KTR_IGMPV3, "%s: ->REPORTING", __func__); 937 inm->inm_state = IGMP_REPORTING_MEMBER; 938 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 939 V_current_state_timers_running = 1; 940 break; 941 case IGMP_SLEEPING_MEMBER: 942 CTR1(KTR_IGMPV3, "%s: ->AWAKENING", __func__); 943 inm->inm_state = IGMP_AWAKENING_MEMBER; 944 break; 945 case IGMP_LEAVING_MEMBER: 946 break; 947 } 948 } 949 950 /* 951 * Process a received IGMPv3 general, group-specific or 952 * group-and-source-specific query. 953 * Assumes m has already been pulled up to the full IGMP message length. 954 * Return 0 if successful, otherwise an appropriate error code is returned. 955 */ 956 static int 957 igmp_input_v3_query(struct ifnet *ifp, const struct ip *ip, 958 /*const*/ struct igmpv3 *igmpv3) 959 { 960 struct igmp_ifsoftc *igi; 961 struct in_multi *inm; 962 int is_general_query; 963 uint32_t maxresp, nsrc, qqi; 964 uint16_t timer; 965 uint8_t qrv; 966 #ifdef KTR 967 char addrbuf[INET_ADDRSTRLEN]; 968 #endif 969 970 is_general_query = 0; 971 972 CTR2(KTR_IGMPV3, "process v3 query on ifp %p(%s)", ifp, ifp->if_xname); 973 974 maxresp = igmpv3->igmp_code; /* in 1/10ths of a second */ 975 if (maxresp >= 128) { 976 maxresp = IGMP_MANT(igmpv3->igmp_code) << 977 (IGMP_EXP(igmpv3->igmp_code) + 3); 978 } 979 980 /* 981 * Robustness must never be less than 2 for on-wire IGMPv3. 982 * FUTURE: Check if ifp has IGIF_LOOPBACK set, as we will make 983 * an exception for interfaces whose IGMPv3 state changes 984 * are redirected to loopback (e.g. MANET). 985 */ 986 qrv = IGMP_QRV(igmpv3->igmp_misc); 987 if (qrv < 2) { 988 CTR3(KTR_IGMPV3, "%s: clamping qrv %d to %d", __func__, 989 qrv, IGMP_RV_INIT); 990 qrv = IGMP_RV_INIT; 991 } 992 993 qqi = igmpv3->igmp_qqi; 994 if (qqi >= 128) { 995 qqi = IGMP_MANT(igmpv3->igmp_qqi) << 996 (IGMP_EXP(igmpv3->igmp_qqi) + 3); 997 } 998 999 timer = maxresp * PR_FASTHZ / IGMP_TIMER_SCALE; 1000 if (timer == 0) 1001 timer = 1; 1002 1003 nsrc = ntohs(igmpv3->igmp_numsrc); 1004 1005 /* 1006 * Validate address fields and versions upfront before 1007 * accepting v3 query. 1008 * XXX SMPng: Unlocked access to igmpstat counters here. 1009 */ 1010 if (in_nullhost(igmpv3->igmp_group)) { 1011 /* 1012 * IGMPv3 General Query. 1013 * 1014 * General Queries SHOULD be directed to 224.0.0.1. 1015 * A general query with a source list has undefined 1016 * behaviour; discard it. 1017 */ 1018 IGMPSTAT_INC(igps_rcv_gen_queries); 1019 if (!in_allhosts(ip->ip_dst) || nsrc > 0) { 1020 IGMPSTAT_INC(igps_rcv_badqueries); 1021 return (0); 1022 } 1023 is_general_query = 1; 1024 } else { 1025 /* Group or group-source specific query. */ 1026 if (nsrc == 0) 1027 IGMPSTAT_INC(igps_rcv_group_queries); 1028 else 1029 IGMPSTAT_INC(igps_rcv_gsr_queries); 1030 } 1031 1032 IN_MULTI_LOCK(); 1033 IGMP_LOCK(); 1034 1035 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 1036 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 1037 1038 if (igi->igi_flags & IGIF_LOOPBACK) { 1039 CTR2(KTR_IGMPV3, "ignore v3 query on IGIF_LOOPBACK ifp %p(%s)", 1040 ifp, ifp->if_xname); 1041 goto out_locked; 1042 } 1043 1044 /* 1045 * Discard the v3 query if we're in Compatibility Mode. 1046 * The RFC is not obviously worded that hosts need to stay in 1047 * compatibility mode until the Old Version Querier Present 1048 * timer expires. 1049 */ 1050 if (igi->igi_version != IGMP_VERSION_3) { 1051 CTR3(KTR_IGMPV3, "ignore v3 query in v%d mode on ifp %p(%s)", 1052 igi->igi_version, ifp, ifp->if_xname); 1053 goto out_locked; 1054 } 1055 1056 igmp_set_version(igi, IGMP_VERSION_3); 1057 igi->igi_rv = qrv; 1058 igi->igi_qi = qqi; 1059 igi->igi_qri = maxresp; 1060 1061 CTR4(KTR_IGMPV3, "%s: qrv %d qi %d qri %d", __func__, qrv, qqi, 1062 maxresp); 1063 1064 if (is_general_query) { 1065 /* 1066 * Schedule a current-state report on this ifp for 1067 * all groups, possibly containing source lists. 1068 * If there is a pending General Query response 1069 * scheduled earlier than the selected delay, do 1070 * not schedule any other reports. 1071 * Otherwise, reset the interface timer. 1072 */ 1073 CTR2(KTR_IGMPV3, "process v3 general query on ifp %p(%s)", 1074 ifp, ifp->if_xname); 1075 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) { 1076 igi->igi_v3_timer = IGMP_RANDOM_DELAY(timer); 1077 V_interface_timers_running = 1; 1078 } 1079 } else { 1080 /* 1081 * Group-source-specific queries are throttled on 1082 * a per-group basis to defeat denial-of-service attempts. 1083 * Queries for groups we are not a member of on this 1084 * link are simply ignored. 1085 */ 1086 inm = inm_lookup(ifp, igmpv3->igmp_group); 1087 if (inm == NULL) 1088 goto out_locked; 1089 if (nsrc > 0) { 1090 if (!ratecheck(&inm->inm_lastgsrtv, 1091 &V_igmp_gsrdelay)) { 1092 CTR1(KTR_IGMPV3, "%s: GS query throttled.", 1093 __func__); 1094 IGMPSTAT_INC(igps_drop_gsr_queries); 1095 goto out_locked; 1096 } 1097 } 1098 CTR3(KTR_IGMPV3, "process v3 %s query on ifp %p(%s)", 1099 inet_ntoa_r(igmpv3->igmp_group, addrbuf), ifp, 1100 ifp->if_xname); 1101 /* 1102 * If there is a pending General Query response 1103 * scheduled sooner than the selected delay, no 1104 * further report need be scheduled. 1105 * Otherwise, prepare to respond to the 1106 * group-specific or group-and-source query. 1107 */ 1108 if (igi->igi_v3_timer == 0 || igi->igi_v3_timer >= timer) 1109 igmp_input_v3_group_query(inm, igi, timer, igmpv3); 1110 } 1111 1112 out_locked: 1113 IGMP_UNLOCK(); 1114 IN_MULTI_UNLOCK(); 1115 1116 return (0); 1117 } 1118 1119 /* 1120 * Process a received IGMPv3 group-specific or group-and-source-specific 1121 * query. 1122 * Return <0 if any error occurred. Currently this is ignored. 1123 */ 1124 static int 1125 igmp_input_v3_group_query(struct in_multi *inm, struct igmp_ifsoftc *igi, 1126 int timer, /*const*/ struct igmpv3 *igmpv3) 1127 { 1128 int retval; 1129 uint16_t nsrc; 1130 1131 IN_MULTI_LOCK_ASSERT(); 1132 IGMP_LOCK_ASSERT(); 1133 1134 retval = 0; 1135 1136 switch (inm->inm_state) { 1137 case IGMP_NOT_MEMBER: 1138 case IGMP_SILENT_MEMBER: 1139 case IGMP_SLEEPING_MEMBER: 1140 case IGMP_LAZY_MEMBER: 1141 case IGMP_AWAKENING_MEMBER: 1142 case IGMP_IDLE_MEMBER: 1143 case IGMP_LEAVING_MEMBER: 1144 return (retval); 1145 break; 1146 case IGMP_REPORTING_MEMBER: 1147 case IGMP_G_QUERY_PENDING_MEMBER: 1148 case IGMP_SG_QUERY_PENDING_MEMBER: 1149 break; 1150 } 1151 1152 nsrc = ntohs(igmpv3->igmp_numsrc); 1153 1154 /* 1155 * Deal with group-specific queries upfront. 1156 * If any group query is already pending, purge any recorded 1157 * source-list state if it exists, and schedule a query response 1158 * for this group-specific query. 1159 */ 1160 if (nsrc == 0) { 1161 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 1162 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) { 1163 inm_clear_recorded(inm); 1164 timer = min(inm->inm_timer, timer); 1165 } 1166 inm->inm_state = IGMP_G_QUERY_PENDING_MEMBER; 1167 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1168 V_current_state_timers_running = 1; 1169 return (retval); 1170 } 1171 1172 /* 1173 * Deal with the case where a group-and-source-specific query has 1174 * been received but a group-specific query is already pending. 1175 */ 1176 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER) { 1177 timer = min(inm->inm_timer, timer); 1178 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1179 V_current_state_timers_running = 1; 1180 return (retval); 1181 } 1182 1183 /* 1184 * Finally, deal with the case where a group-and-source-specific 1185 * query has been received, where a response to a previous g-s-r 1186 * query exists, or none exists. 1187 * In this case, we need to parse the source-list which the Querier 1188 * has provided us with and check if we have any source list filter 1189 * entries at T1 for these sources. If we do not, there is no need 1190 * schedule a report and the query may be dropped. 1191 * If we do, we must record them and schedule a current-state 1192 * report for those sources. 1193 * FIXME: Handling source lists larger than 1 mbuf requires that 1194 * we pass the mbuf chain pointer down to this function, and use 1195 * m_getptr() to walk the chain. 1196 */ 1197 if (inm->inm_nsrc > 0) { 1198 const struct in_addr *ap; 1199 int i, nrecorded; 1200 1201 ap = (const struct in_addr *)(igmpv3 + 1); 1202 nrecorded = 0; 1203 for (i = 0; i < nsrc; i++, ap++) { 1204 retval = inm_record_source(inm, ap->s_addr); 1205 if (retval < 0) 1206 break; 1207 nrecorded += retval; 1208 } 1209 if (nrecorded > 0) { 1210 CTR1(KTR_IGMPV3, 1211 "%s: schedule response to SG query", __func__); 1212 inm->inm_state = IGMP_SG_QUERY_PENDING_MEMBER; 1213 inm->inm_timer = IGMP_RANDOM_DELAY(timer); 1214 V_current_state_timers_running = 1; 1215 } 1216 } 1217 1218 return (retval); 1219 } 1220 1221 /* 1222 * Process a received IGMPv1 host membership report. 1223 * 1224 * NOTE: 0.0.0.0 workaround breaks const correctness. 1225 */ 1226 static int 1227 igmp_input_v1_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1228 /*const*/ struct igmp *igmp) 1229 { 1230 struct rm_priotracker in_ifa_tracker; 1231 struct in_ifaddr *ia; 1232 struct in_multi *inm; 1233 #ifdef KTR 1234 char addrbuf[INET_ADDRSTRLEN]; 1235 #endif 1236 1237 IGMPSTAT_INC(igps_rcv_reports); 1238 1239 if (ifp->if_flags & IFF_LOOPBACK) 1240 return (0); 1241 1242 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1243 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1244 IGMPSTAT_INC(igps_rcv_badreports); 1245 return (EINVAL); 1246 } 1247 1248 /* 1249 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1250 * Booting clients may use the source address 0.0.0.0. Some 1251 * IGMP daemons may not know how to use IP_RECVIF to determine 1252 * the interface upon which this message was received. 1253 * Replace 0.0.0.0 with the subnet address if told to do so. 1254 */ 1255 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1256 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 1257 if (ia != NULL) { 1258 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1259 ifa_free(&ia->ia_ifa); 1260 } 1261 } 1262 1263 CTR3(KTR_IGMPV3, "process v1 report %s on ifp %p(%s)", 1264 inet_ntoa_r(igmp->igmp_group, addrbuf), ifp, ifp->if_xname); 1265 1266 /* 1267 * IGMPv1 report suppression. 1268 * If we are a member of this group, and our membership should be 1269 * reported, stop our group timer and transition to the 'lazy' state. 1270 */ 1271 IN_MULTI_LOCK(); 1272 inm = inm_lookup(ifp, igmp->igmp_group); 1273 if (inm != NULL) { 1274 struct igmp_ifsoftc *igi; 1275 1276 igi = inm->inm_igi; 1277 if (igi == NULL) { 1278 KASSERT(igi != NULL, 1279 ("%s: no igi for ifp %p", __func__, ifp)); 1280 goto out_locked; 1281 } 1282 1283 IGMPSTAT_INC(igps_rcv_ourreports); 1284 1285 /* 1286 * If we are in IGMPv3 host mode, do not allow the 1287 * other host's IGMPv1 report to suppress our reports 1288 * unless explicitly configured to do so. 1289 */ 1290 if (igi->igi_version == IGMP_VERSION_3) { 1291 if (V_igmp_legacysupp) 1292 igmp_v3_suppress_group_record(inm); 1293 goto out_locked; 1294 } 1295 1296 inm->inm_timer = 0; 1297 1298 switch (inm->inm_state) { 1299 case IGMP_NOT_MEMBER: 1300 case IGMP_SILENT_MEMBER: 1301 break; 1302 case IGMP_IDLE_MEMBER: 1303 case IGMP_LAZY_MEMBER: 1304 case IGMP_AWAKENING_MEMBER: 1305 CTR3(KTR_IGMPV3, 1306 "report suppressed for %s on ifp %p(%s)", 1307 inet_ntoa_r(igmp->igmp_group, addrbuf), ifp, 1308 ifp->if_xname); 1309 case IGMP_SLEEPING_MEMBER: 1310 inm->inm_state = IGMP_SLEEPING_MEMBER; 1311 break; 1312 case IGMP_REPORTING_MEMBER: 1313 CTR3(KTR_IGMPV3, 1314 "report suppressed for %s on ifp %p(%s)", 1315 inet_ntoa_r(igmp->igmp_group, addrbuf), ifp, 1316 ifp->if_xname); 1317 if (igi->igi_version == IGMP_VERSION_1) 1318 inm->inm_state = IGMP_LAZY_MEMBER; 1319 else if (igi->igi_version == IGMP_VERSION_2) 1320 inm->inm_state = IGMP_SLEEPING_MEMBER; 1321 break; 1322 case IGMP_G_QUERY_PENDING_MEMBER: 1323 case IGMP_SG_QUERY_PENDING_MEMBER: 1324 case IGMP_LEAVING_MEMBER: 1325 break; 1326 } 1327 } 1328 1329 out_locked: 1330 IN_MULTI_UNLOCK(); 1331 1332 return (0); 1333 } 1334 1335 /* 1336 * Process a received IGMPv2 host membership report. 1337 * 1338 * NOTE: 0.0.0.0 workaround breaks const correctness. 1339 */ 1340 static int 1341 igmp_input_v2_report(struct ifnet *ifp, /*const*/ struct ip *ip, 1342 /*const*/ struct igmp *igmp) 1343 { 1344 struct rm_priotracker in_ifa_tracker; 1345 struct in_ifaddr *ia; 1346 struct in_multi *inm; 1347 #ifdef KTR 1348 char addrbuf[INET_ADDRSTRLEN]; 1349 #endif 1350 1351 /* 1352 * Make sure we don't hear our own membership report. Fast 1353 * leave requires knowing that we are the only member of a 1354 * group. 1355 */ 1356 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 1357 if (ia != NULL && in_hosteq(ip->ip_src, IA_SIN(ia)->sin_addr)) { 1358 ifa_free(&ia->ia_ifa); 1359 return (0); 1360 } 1361 1362 IGMPSTAT_INC(igps_rcv_reports); 1363 1364 if (ifp->if_flags & IFF_LOOPBACK) { 1365 if (ia != NULL) 1366 ifa_free(&ia->ia_ifa); 1367 return (0); 1368 } 1369 1370 if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) || 1371 !in_hosteq(igmp->igmp_group, ip->ip_dst)) { 1372 if (ia != NULL) 1373 ifa_free(&ia->ia_ifa); 1374 IGMPSTAT_INC(igps_rcv_badreports); 1375 return (EINVAL); 1376 } 1377 1378 /* 1379 * RFC 3376, Section 4.2.13, 9.2, 9.3: 1380 * Booting clients may use the source address 0.0.0.0. Some 1381 * IGMP daemons may not know how to use IP_RECVIF to determine 1382 * the interface upon which this message was received. 1383 * Replace 0.0.0.0 with the subnet address if told to do so. 1384 */ 1385 if (V_igmp_recvifkludge && in_nullhost(ip->ip_src)) { 1386 if (ia != NULL) 1387 ip->ip_src.s_addr = htonl(ia->ia_subnet); 1388 } 1389 if (ia != NULL) 1390 ifa_free(&ia->ia_ifa); 1391 1392 CTR3(KTR_IGMPV3, "process v2 report %s on ifp %p(%s)", 1393 inet_ntoa_r(igmp->igmp_group, addrbuf), ifp, ifp->if_xname); 1394 1395 /* 1396 * IGMPv2 report suppression. 1397 * If we are a member of this group, and our membership should be 1398 * reported, and our group timer is pending or about to be reset, 1399 * stop our group timer by transitioning to the 'lazy' state. 1400 */ 1401 IN_MULTI_LOCK(); 1402 inm = inm_lookup(ifp, igmp->igmp_group); 1403 if (inm != NULL) { 1404 struct igmp_ifsoftc *igi; 1405 1406 igi = inm->inm_igi; 1407 KASSERT(igi != NULL, ("%s: no igi for ifp %p", __func__, ifp)); 1408 1409 IGMPSTAT_INC(igps_rcv_ourreports); 1410 1411 /* 1412 * If we are in IGMPv3 host mode, do not allow the 1413 * other host's IGMPv1 report to suppress our reports 1414 * unless explicitly configured to do so. 1415 */ 1416 if (igi->igi_version == IGMP_VERSION_3) { 1417 if (V_igmp_legacysupp) 1418 igmp_v3_suppress_group_record(inm); 1419 goto out_locked; 1420 } 1421 1422 inm->inm_timer = 0; 1423 1424 switch (inm->inm_state) { 1425 case IGMP_NOT_MEMBER: 1426 case IGMP_SILENT_MEMBER: 1427 case IGMP_SLEEPING_MEMBER: 1428 break; 1429 case IGMP_REPORTING_MEMBER: 1430 case IGMP_IDLE_MEMBER: 1431 case IGMP_AWAKENING_MEMBER: 1432 CTR3(KTR_IGMPV3, 1433 "report suppressed for %s on ifp %p(%s)", 1434 inet_ntoa_r(igmp->igmp_group, addrbuf), ifp, 1435 ifp->if_xname); 1436 case IGMP_LAZY_MEMBER: 1437 inm->inm_state = IGMP_LAZY_MEMBER; 1438 break; 1439 case IGMP_G_QUERY_PENDING_MEMBER: 1440 case IGMP_SG_QUERY_PENDING_MEMBER: 1441 case IGMP_LEAVING_MEMBER: 1442 break; 1443 } 1444 } 1445 1446 out_locked: 1447 IN_MULTI_UNLOCK(); 1448 1449 return (0); 1450 } 1451 1452 int 1453 igmp_input(struct mbuf **mp, int *offp, int proto) 1454 { 1455 int iphlen; 1456 struct ifnet *ifp; 1457 struct igmp *igmp; 1458 struct ip *ip; 1459 struct mbuf *m; 1460 int igmplen; 1461 int minlen; 1462 int queryver; 1463 1464 CTR3(KTR_IGMPV3, "%s: called w/mbuf (%p,%d)", __func__, *mp, *offp); 1465 1466 m = *mp; 1467 ifp = m->m_pkthdr.rcvif; 1468 *mp = NULL; 1469 1470 IGMPSTAT_INC(igps_rcv_total); 1471 1472 ip = mtod(m, struct ip *); 1473 iphlen = *offp; 1474 igmplen = ntohs(ip->ip_len) - iphlen; 1475 1476 /* 1477 * Validate lengths. 1478 */ 1479 if (igmplen < IGMP_MINLEN) { 1480 IGMPSTAT_INC(igps_rcv_tooshort); 1481 m_freem(m); 1482 return (IPPROTO_DONE); 1483 } 1484 1485 /* 1486 * Always pullup to the minimum size for v1/v2 or v3 1487 * to amortize calls to m_pullup(). 1488 */ 1489 minlen = iphlen; 1490 if (igmplen >= IGMP_V3_QUERY_MINLEN) 1491 minlen += IGMP_V3_QUERY_MINLEN; 1492 else 1493 minlen += IGMP_MINLEN; 1494 if ((!M_WRITABLE(m) || m->m_len < minlen) && 1495 (m = m_pullup(m, minlen)) == NULL) { 1496 IGMPSTAT_INC(igps_rcv_tooshort); 1497 return (IPPROTO_DONE); 1498 } 1499 ip = mtod(m, struct ip *); 1500 1501 /* 1502 * Validate checksum. 1503 */ 1504 m->m_data += iphlen; 1505 m->m_len -= iphlen; 1506 igmp = mtod(m, struct igmp *); 1507 if (in_cksum(m, igmplen)) { 1508 IGMPSTAT_INC(igps_rcv_badsum); 1509 m_freem(m); 1510 return (IPPROTO_DONE); 1511 } 1512 m->m_data -= iphlen; 1513 m->m_len += iphlen; 1514 1515 /* 1516 * IGMP control traffic is link-scope, and must have a TTL of 1. 1517 * DVMRP traffic (e.g. mrinfo, mtrace) is an exception; 1518 * probe packets may come from beyond the LAN. 1519 */ 1520 if (igmp->igmp_type != IGMP_DVMRP && ip->ip_ttl != 1) { 1521 IGMPSTAT_INC(igps_rcv_badttl); 1522 m_freem(m); 1523 return (IPPROTO_DONE); 1524 } 1525 1526 switch (igmp->igmp_type) { 1527 case IGMP_HOST_MEMBERSHIP_QUERY: 1528 if (igmplen == IGMP_MINLEN) { 1529 if (igmp->igmp_code == 0) 1530 queryver = IGMP_VERSION_1; 1531 else 1532 queryver = IGMP_VERSION_2; 1533 } else if (igmplen >= IGMP_V3_QUERY_MINLEN) { 1534 queryver = IGMP_VERSION_3; 1535 } else { 1536 IGMPSTAT_INC(igps_rcv_tooshort); 1537 m_freem(m); 1538 return (IPPROTO_DONE); 1539 } 1540 1541 switch (queryver) { 1542 case IGMP_VERSION_1: 1543 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1544 if (!V_igmp_v1enable) 1545 break; 1546 if (igmp_input_v1_query(ifp, ip, igmp) != 0) { 1547 m_freem(m); 1548 return (IPPROTO_DONE); 1549 } 1550 break; 1551 1552 case IGMP_VERSION_2: 1553 IGMPSTAT_INC(igps_rcv_v1v2_queries); 1554 if (!V_igmp_v2enable) 1555 break; 1556 if (igmp_input_v2_query(ifp, ip, igmp) != 0) { 1557 m_freem(m); 1558 return (IPPROTO_DONE); 1559 } 1560 break; 1561 1562 case IGMP_VERSION_3: { 1563 struct igmpv3 *igmpv3; 1564 uint16_t igmpv3len; 1565 uint16_t nsrc; 1566 1567 IGMPSTAT_INC(igps_rcv_v3_queries); 1568 igmpv3 = (struct igmpv3 *)igmp; 1569 /* 1570 * Validate length based on source count. 1571 */ 1572 nsrc = ntohs(igmpv3->igmp_numsrc); 1573 if (nsrc * sizeof(in_addr_t) > 1574 UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) { 1575 IGMPSTAT_INC(igps_rcv_tooshort); 1576 return (IPPROTO_DONE); 1577 } 1578 /* 1579 * m_pullup() may modify m, so pullup in 1580 * this scope. 1581 */ 1582 igmpv3len = iphlen + IGMP_V3_QUERY_MINLEN + 1583 sizeof(struct in_addr) * nsrc; 1584 if ((!M_WRITABLE(m) || 1585 m->m_len < igmpv3len) && 1586 (m = m_pullup(m, igmpv3len)) == NULL) { 1587 IGMPSTAT_INC(igps_rcv_tooshort); 1588 return (IPPROTO_DONE); 1589 } 1590 igmpv3 = (struct igmpv3 *)(mtod(m, uint8_t *) 1591 + iphlen); 1592 if (igmp_input_v3_query(ifp, ip, igmpv3) != 0) { 1593 m_freem(m); 1594 return (IPPROTO_DONE); 1595 } 1596 } 1597 break; 1598 } 1599 break; 1600 1601 case IGMP_v1_HOST_MEMBERSHIP_REPORT: 1602 if (!V_igmp_v1enable) 1603 break; 1604 if (igmp_input_v1_report(ifp, ip, igmp) != 0) { 1605 m_freem(m); 1606 return (IPPROTO_DONE); 1607 } 1608 break; 1609 1610 case IGMP_v2_HOST_MEMBERSHIP_REPORT: 1611 if (!V_igmp_v2enable) 1612 break; 1613 if (!ip_checkrouteralert(m)) 1614 IGMPSTAT_INC(igps_rcv_nora); 1615 if (igmp_input_v2_report(ifp, ip, igmp) != 0) { 1616 m_freem(m); 1617 return (IPPROTO_DONE); 1618 } 1619 break; 1620 1621 case IGMP_v3_HOST_MEMBERSHIP_REPORT: 1622 /* 1623 * Hosts do not need to process IGMPv3 membership reports, 1624 * as report suppression is no longer required. 1625 */ 1626 if (!ip_checkrouteralert(m)) 1627 IGMPSTAT_INC(igps_rcv_nora); 1628 break; 1629 1630 default: 1631 break; 1632 } 1633 1634 /* 1635 * Pass all valid IGMP packets up to any process(es) listening on a 1636 * raw IGMP socket. 1637 */ 1638 *mp = m; 1639 return (rip_input(mp, offp, proto)); 1640 } 1641 1642 1643 /* 1644 * Fast timeout handler (global). 1645 * VIMAGE: Timeout handlers are expected to service all vimages. 1646 */ 1647 void 1648 igmp_fasttimo(void) 1649 { 1650 VNET_ITERATOR_DECL(vnet_iter); 1651 1652 VNET_LIST_RLOCK_NOSLEEP(); 1653 VNET_FOREACH(vnet_iter) { 1654 CURVNET_SET(vnet_iter); 1655 igmp_fasttimo_vnet(); 1656 CURVNET_RESTORE(); 1657 } 1658 VNET_LIST_RUNLOCK_NOSLEEP(); 1659 } 1660 1661 /* 1662 * Fast timeout handler (per-vnet). 1663 * Sends are shuffled off to a netisr to deal with Giant. 1664 * 1665 * VIMAGE: Assume caller has set up our curvnet. 1666 */ 1667 static void 1668 igmp_fasttimo_vnet(void) 1669 { 1670 struct mbufq scq; /* State-change packets */ 1671 struct mbufq qrq; /* Query response packets */ 1672 struct ifnet *ifp; 1673 struct igmp_ifsoftc *igi; 1674 struct ifmultiaddr *ifma; 1675 struct in_multi *inm; 1676 int loop, uri_fasthz; 1677 1678 loop = 0; 1679 uri_fasthz = 0; 1680 1681 /* 1682 * Quick check to see if any work needs to be done, in order to 1683 * minimize the overhead of fasttimo processing. 1684 * SMPng: XXX Unlocked reads. 1685 */ 1686 if (!V_current_state_timers_running && 1687 !V_interface_timers_running && 1688 !V_state_change_timers_running) 1689 return; 1690 1691 IN_MULTI_LOCK(); 1692 IGMP_LOCK(); 1693 1694 /* 1695 * IGMPv3 General Query response timer processing. 1696 */ 1697 if (V_interface_timers_running) { 1698 CTR1(KTR_IGMPV3, "%s: interface timers running", __func__); 1699 1700 V_interface_timers_running = 0; 1701 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1702 if (igi->igi_v3_timer == 0) { 1703 /* Do nothing. */ 1704 } else if (--igi->igi_v3_timer == 0) { 1705 igmp_v3_dispatch_general_query(igi); 1706 } else { 1707 V_interface_timers_running = 1; 1708 } 1709 } 1710 } 1711 1712 if (!V_current_state_timers_running && 1713 !V_state_change_timers_running) 1714 goto out_locked; 1715 1716 V_current_state_timers_running = 0; 1717 V_state_change_timers_running = 0; 1718 1719 CTR1(KTR_IGMPV3, "%s: state change timers running", __func__); 1720 1721 /* 1722 * IGMPv1/v2/v3 host report and state-change timer processing. 1723 * Note: Processing a v3 group timer may remove a node. 1724 */ 1725 LIST_FOREACH(igi, &V_igi_head, igi_link) { 1726 ifp = igi->igi_ifp; 1727 1728 if (igi->igi_version == IGMP_VERSION_3) { 1729 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 1730 uri_fasthz = IGMP_RANDOM_DELAY(igi->igi_uri * 1731 PR_FASTHZ); 1732 mbufq_init(&qrq, IGMP_MAX_G_GS_PACKETS); 1733 mbufq_init(&scq, IGMP_MAX_STATE_CHANGE_PACKETS); 1734 } 1735 1736 IF_ADDR_RLOCK(ifp); 1737 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1738 if (ifma->ifma_addr->sa_family != AF_INET || 1739 ifma->ifma_protospec == NULL) 1740 continue; 1741 inm = (struct in_multi *)ifma->ifma_protospec; 1742 switch (igi->igi_version) { 1743 case IGMP_VERSION_1: 1744 case IGMP_VERSION_2: 1745 igmp_v1v2_process_group_timer(inm, 1746 igi->igi_version); 1747 break; 1748 case IGMP_VERSION_3: 1749 igmp_v3_process_group_timers(igi, &qrq, 1750 &scq, inm, uri_fasthz); 1751 break; 1752 } 1753 } 1754 IF_ADDR_RUNLOCK(ifp); 1755 1756 if (igi->igi_version == IGMP_VERSION_3) { 1757 struct in_multi *tinm; 1758 1759 igmp_dispatch_queue(&qrq, 0, loop); 1760 igmp_dispatch_queue(&scq, 0, loop); 1761 1762 /* 1763 * Free the in_multi reference(s) for this 1764 * IGMP lifecycle. 1765 */ 1766 SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, 1767 inm_nrele, tinm) { 1768 SLIST_REMOVE_HEAD(&igi->igi_relinmhead, 1769 inm_nrele); 1770 inm_release_locked(inm); 1771 } 1772 } 1773 } 1774 1775 out_locked: 1776 IGMP_UNLOCK(); 1777 IN_MULTI_UNLOCK(); 1778 } 1779 1780 /* 1781 * Update host report group timer for IGMPv1/v2. 1782 * Will update the global pending timer flags. 1783 */ 1784 static void 1785 igmp_v1v2_process_group_timer(struct in_multi *inm, const int version) 1786 { 1787 int report_timer_expired; 1788 1789 IN_MULTI_LOCK_ASSERT(); 1790 IGMP_LOCK_ASSERT(); 1791 1792 if (inm->inm_timer == 0) { 1793 report_timer_expired = 0; 1794 } else if (--inm->inm_timer == 0) { 1795 report_timer_expired = 1; 1796 } else { 1797 V_current_state_timers_running = 1; 1798 return; 1799 } 1800 1801 switch (inm->inm_state) { 1802 case IGMP_NOT_MEMBER: 1803 case IGMP_SILENT_MEMBER: 1804 case IGMP_IDLE_MEMBER: 1805 case IGMP_LAZY_MEMBER: 1806 case IGMP_SLEEPING_MEMBER: 1807 case IGMP_AWAKENING_MEMBER: 1808 break; 1809 case IGMP_REPORTING_MEMBER: 1810 if (report_timer_expired) { 1811 inm->inm_state = IGMP_IDLE_MEMBER; 1812 (void)igmp_v1v2_queue_report(inm, 1813 (version == IGMP_VERSION_2) ? 1814 IGMP_v2_HOST_MEMBERSHIP_REPORT : 1815 IGMP_v1_HOST_MEMBERSHIP_REPORT); 1816 } 1817 break; 1818 case IGMP_G_QUERY_PENDING_MEMBER: 1819 case IGMP_SG_QUERY_PENDING_MEMBER: 1820 case IGMP_LEAVING_MEMBER: 1821 break; 1822 } 1823 } 1824 1825 /* 1826 * Update a group's timers for IGMPv3. 1827 * Will update the global pending timer flags. 1828 * Note: Unlocked read from igi. 1829 */ 1830 static void 1831 igmp_v3_process_group_timers(struct igmp_ifsoftc *igi, 1832 struct mbufq *qrq, struct mbufq *scq, 1833 struct in_multi *inm, const int uri_fasthz) 1834 { 1835 int query_response_timer_expired; 1836 int state_change_retransmit_timer_expired; 1837 #ifdef KTR 1838 char addrbuf[INET_ADDRSTRLEN]; 1839 #endif 1840 1841 IN_MULTI_LOCK_ASSERT(); 1842 IGMP_LOCK_ASSERT(); 1843 1844 query_response_timer_expired = 0; 1845 state_change_retransmit_timer_expired = 0; 1846 1847 /* 1848 * During a transition from v1/v2 compatibility mode back to v3, 1849 * a group record in REPORTING state may still have its group 1850 * timer active. This is a no-op in this function; it is easier 1851 * to deal with it here than to complicate the slow-timeout path. 1852 */ 1853 if (inm->inm_timer == 0) { 1854 query_response_timer_expired = 0; 1855 } else if (--inm->inm_timer == 0) { 1856 query_response_timer_expired = 1; 1857 } else { 1858 V_current_state_timers_running = 1; 1859 } 1860 1861 if (inm->inm_sctimer == 0) { 1862 state_change_retransmit_timer_expired = 0; 1863 } else if (--inm->inm_sctimer == 0) { 1864 state_change_retransmit_timer_expired = 1; 1865 } else { 1866 V_state_change_timers_running = 1; 1867 } 1868 1869 /* We are in fasttimo, so be quick about it. */ 1870 if (!state_change_retransmit_timer_expired && 1871 !query_response_timer_expired) 1872 return; 1873 1874 switch (inm->inm_state) { 1875 case IGMP_NOT_MEMBER: 1876 case IGMP_SILENT_MEMBER: 1877 case IGMP_SLEEPING_MEMBER: 1878 case IGMP_LAZY_MEMBER: 1879 case IGMP_AWAKENING_MEMBER: 1880 case IGMP_IDLE_MEMBER: 1881 break; 1882 case IGMP_G_QUERY_PENDING_MEMBER: 1883 case IGMP_SG_QUERY_PENDING_MEMBER: 1884 /* 1885 * Respond to a previously pending Group-Specific 1886 * or Group-and-Source-Specific query by enqueueing 1887 * the appropriate Current-State report for 1888 * immediate transmission. 1889 */ 1890 if (query_response_timer_expired) { 1891 int retval; 1892 1893 retval = igmp_v3_enqueue_group_record(qrq, inm, 0, 1, 1894 (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER)); 1895 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 1896 __func__, retval); 1897 inm->inm_state = IGMP_REPORTING_MEMBER; 1898 /* XXX Clear recorded sources for next time. */ 1899 inm_clear_recorded(inm); 1900 } 1901 /* FALLTHROUGH */ 1902 case IGMP_REPORTING_MEMBER: 1903 case IGMP_LEAVING_MEMBER: 1904 if (state_change_retransmit_timer_expired) { 1905 /* 1906 * State-change retransmission timer fired. 1907 * If there are any further pending retransmissions, 1908 * set the global pending state-change flag, and 1909 * reset the timer. 1910 */ 1911 if (--inm->inm_scrv > 0) { 1912 inm->inm_sctimer = uri_fasthz; 1913 V_state_change_timers_running = 1; 1914 } 1915 /* 1916 * Retransmit the previously computed state-change 1917 * report. If there are no further pending 1918 * retransmissions, the mbuf queue will be consumed. 1919 * Update T0 state to T1 as we have now sent 1920 * a state-change. 1921 */ 1922 (void)igmp_v3_merge_state_changes(inm, scq); 1923 1924 inm_commit(inm); 1925 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__, 1926 inet_ntoa_r(inm->inm_addr, addrbuf), 1927 inm->inm_ifp->if_xname); 1928 1929 /* 1930 * If we are leaving the group for good, make sure 1931 * we release IGMP's reference to it. 1932 * This release must be deferred using a SLIST, 1933 * as we are called from a loop which traverses 1934 * the in_ifmultiaddr TAILQ. 1935 */ 1936 if (inm->inm_state == IGMP_LEAVING_MEMBER && 1937 inm->inm_scrv == 0) { 1938 inm->inm_state = IGMP_NOT_MEMBER; 1939 SLIST_INSERT_HEAD(&igi->igi_relinmhead, 1940 inm, inm_nrele); 1941 } 1942 } 1943 break; 1944 } 1945 } 1946 1947 1948 /* 1949 * Suppress a group's pending response to a group or source/group query. 1950 * 1951 * Do NOT suppress state changes. This leads to IGMPv3 inconsistency. 1952 * Do NOT update ST1/ST0 as this operation merely suppresses 1953 * the currently pending group record. 1954 * Do NOT suppress the response to a general query. It is possible but 1955 * it would require adding another state or flag. 1956 */ 1957 static void 1958 igmp_v3_suppress_group_record(struct in_multi *inm) 1959 { 1960 1961 IN_MULTI_LOCK_ASSERT(); 1962 1963 KASSERT(inm->inm_igi->igi_version == IGMP_VERSION_3, 1964 ("%s: not IGMPv3 mode on link", __func__)); 1965 1966 if (inm->inm_state != IGMP_G_QUERY_PENDING_MEMBER || 1967 inm->inm_state != IGMP_SG_QUERY_PENDING_MEMBER) 1968 return; 1969 1970 if (inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 1971 inm_clear_recorded(inm); 1972 1973 inm->inm_timer = 0; 1974 inm->inm_state = IGMP_REPORTING_MEMBER; 1975 } 1976 1977 /* 1978 * Switch to a different IGMP version on the given interface, 1979 * as per Section 7.2.1. 1980 */ 1981 static void 1982 igmp_set_version(struct igmp_ifsoftc *igi, const int version) 1983 { 1984 int old_version_timer; 1985 1986 IGMP_LOCK_ASSERT(); 1987 1988 CTR4(KTR_IGMPV3, "%s: switching to v%d on ifp %p(%s)", __func__, 1989 version, igi->igi_ifp, igi->igi_ifp->if_xname); 1990 1991 if (version == IGMP_VERSION_1 || version == IGMP_VERSION_2) { 1992 /* 1993 * Compute the "Older Version Querier Present" timer as per 1994 * Section 8.12. 1995 */ 1996 old_version_timer = igi->igi_rv * igi->igi_qi + igi->igi_qri; 1997 old_version_timer *= PR_SLOWHZ; 1998 1999 if (version == IGMP_VERSION_1) { 2000 igi->igi_v1_timer = old_version_timer; 2001 igi->igi_v2_timer = 0; 2002 } else if (version == IGMP_VERSION_2) { 2003 igi->igi_v1_timer = 0; 2004 igi->igi_v2_timer = old_version_timer; 2005 } 2006 } 2007 2008 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2009 if (igi->igi_version != IGMP_VERSION_2) { 2010 igi->igi_version = IGMP_VERSION_2; 2011 igmp_v3_cancel_link_timers(igi); 2012 } 2013 } else if (igi->igi_v1_timer > 0) { 2014 if (igi->igi_version != IGMP_VERSION_1) { 2015 igi->igi_version = IGMP_VERSION_1; 2016 igmp_v3_cancel_link_timers(igi); 2017 } 2018 } 2019 } 2020 2021 /* 2022 * Cancel pending IGMPv3 timers for the given link and all groups 2023 * joined on it; state-change, general-query, and group-query timers. 2024 * 2025 * Only ever called on a transition from v3 to Compatibility mode. Kill 2026 * the timers stone dead (this may be expensive for large N groups), they 2027 * will be restarted if Compatibility Mode deems that they must be due to 2028 * query processing. 2029 */ 2030 static void 2031 igmp_v3_cancel_link_timers(struct igmp_ifsoftc *igi) 2032 { 2033 struct ifmultiaddr *ifma; 2034 struct ifnet *ifp; 2035 struct in_multi *inm, *tinm; 2036 2037 CTR3(KTR_IGMPV3, "%s: cancel v3 timers on ifp %p(%s)", __func__, 2038 igi->igi_ifp, igi->igi_ifp->if_xname); 2039 2040 IN_MULTI_LOCK_ASSERT(); 2041 IGMP_LOCK_ASSERT(); 2042 2043 /* 2044 * Stop the v3 General Query Response on this link stone dead. 2045 * If fasttimo is woken up due to V_interface_timers_running, 2046 * the flag will be cleared if there are no pending link timers. 2047 */ 2048 igi->igi_v3_timer = 0; 2049 2050 /* 2051 * Now clear the current-state and state-change report timers 2052 * for all memberships scoped to this link. 2053 */ 2054 ifp = igi->igi_ifp; 2055 IF_ADDR_RLOCK(ifp); 2056 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2057 if (ifma->ifma_addr->sa_family != AF_INET || 2058 ifma->ifma_protospec == NULL) 2059 continue; 2060 inm = (struct in_multi *)ifma->ifma_protospec; 2061 switch (inm->inm_state) { 2062 case IGMP_NOT_MEMBER: 2063 case IGMP_SILENT_MEMBER: 2064 case IGMP_IDLE_MEMBER: 2065 case IGMP_LAZY_MEMBER: 2066 case IGMP_SLEEPING_MEMBER: 2067 case IGMP_AWAKENING_MEMBER: 2068 /* 2069 * These states are either not relevant in v3 mode, 2070 * or are unreported. Do nothing. 2071 */ 2072 break; 2073 case IGMP_LEAVING_MEMBER: 2074 /* 2075 * If we are leaving the group and switching to 2076 * compatibility mode, we need to release the final 2077 * reference held for issuing the INCLUDE {}, and 2078 * transition to REPORTING to ensure the host leave 2079 * message is sent upstream to the old querier -- 2080 * transition to NOT would lose the leave and race. 2081 */ 2082 SLIST_INSERT_HEAD(&igi->igi_relinmhead, inm, inm_nrele); 2083 /* FALLTHROUGH */ 2084 case IGMP_G_QUERY_PENDING_MEMBER: 2085 case IGMP_SG_QUERY_PENDING_MEMBER: 2086 inm_clear_recorded(inm); 2087 /* FALLTHROUGH */ 2088 case IGMP_REPORTING_MEMBER: 2089 inm->inm_state = IGMP_REPORTING_MEMBER; 2090 break; 2091 } 2092 /* 2093 * Always clear state-change and group report timers. 2094 * Free any pending IGMPv3 state-change records. 2095 */ 2096 inm->inm_sctimer = 0; 2097 inm->inm_timer = 0; 2098 mbufq_drain(&inm->inm_scq); 2099 } 2100 IF_ADDR_RUNLOCK(ifp); 2101 SLIST_FOREACH_SAFE(inm, &igi->igi_relinmhead, inm_nrele, tinm) { 2102 SLIST_REMOVE_HEAD(&igi->igi_relinmhead, inm_nrele); 2103 inm_release_locked(inm); 2104 } 2105 } 2106 2107 /* 2108 * Update the Older Version Querier Present timers for a link. 2109 * See Section 7.2.1 of RFC 3376. 2110 */ 2111 static void 2112 igmp_v1v2_process_querier_timers(struct igmp_ifsoftc *igi) 2113 { 2114 2115 IGMP_LOCK_ASSERT(); 2116 2117 if (igi->igi_v1_timer == 0 && igi->igi_v2_timer == 0) { 2118 /* 2119 * IGMPv1 and IGMPv2 Querier Present timers expired. 2120 * 2121 * Revert to IGMPv3. 2122 */ 2123 if (igi->igi_version != IGMP_VERSION_3) { 2124 CTR5(KTR_IGMPV3, 2125 "%s: transition from v%d -> v%d on %p(%s)", 2126 __func__, igi->igi_version, IGMP_VERSION_3, 2127 igi->igi_ifp, igi->igi_ifp->if_xname); 2128 igi->igi_version = IGMP_VERSION_3; 2129 } 2130 } else if (igi->igi_v1_timer == 0 && igi->igi_v2_timer > 0) { 2131 /* 2132 * IGMPv1 Querier Present timer expired, 2133 * IGMPv2 Querier Present timer running. 2134 * If IGMPv2 was disabled since last timeout, 2135 * revert to IGMPv3. 2136 * If IGMPv2 is enabled, revert to IGMPv2. 2137 */ 2138 if (!V_igmp_v2enable) { 2139 CTR5(KTR_IGMPV3, 2140 "%s: transition from v%d -> v%d on %p(%s)", 2141 __func__, igi->igi_version, IGMP_VERSION_3, 2142 igi->igi_ifp, igi->igi_ifp->if_xname); 2143 igi->igi_v2_timer = 0; 2144 igi->igi_version = IGMP_VERSION_3; 2145 } else { 2146 --igi->igi_v2_timer; 2147 if (igi->igi_version != IGMP_VERSION_2) { 2148 CTR5(KTR_IGMPV3, 2149 "%s: transition from v%d -> v%d on %p(%s)", 2150 __func__, igi->igi_version, IGMP_VERSION_2, 2151 igi->igi_ifp, igi->igi_ifp->if_xname); 2152 igi->igi_version = IGMP_VERSION_2; 2153 igmp_v3_cancel_link_timers(igi); 2154 } 2155 } 2156 } else if (igi->igi_v1_timer > 0) { 2157 /* 2158 * IGMPv1 Querier Present timer running. 2159 * Stop IGMPv2 timer if running. 2160 * 2161 * If IGMPv1 was disabled since last timeout, 2162 * revert to IGMPv3. 2163 * If IGMPv1 is enabled, reset IGMPv2 timer if running. 2164 */ 2165 if (!V_igmp_v1enable) { 2166 CTR5(KTR_IGMPV3, 2167 "%s: transition from v%d -> v%d on %p(%s)", 2168 __func__, igi->igi_version, IGMP_VERSION_3, 2169 igi->igi_ifp, igi->igi_ifp->if_xname); 2170 igi->igi_v1_timer = 0; 2171 igi->igi_version = IGMP_VERSION_3; 2172 } else { 2173 --igi->igi_v1_timer; 2174 } 2175 if (igi->igi_v2_timer > 0) { 2176 CTR3(KTR_IGMPV3, 2177 "%s: cancel v2 timer on %p(%s)", 2178 __func__, igi->igi_ifp, igi->igi_ifp->if_xname); 2179 igi->igi_v2_timer = 0; 2180 } 2181 } 2182 } 2183 2184 /* 2185 * Global slowtimo handler. 2186 * VIMAGE: Timeout handlers are expected to service all vimages. 2187 */ 2188 void 2189 igmp_slowtimo(void) 2190 { 2191 VNET_ITERATOR_DECL(vnet_iter); 2192 2193 VNET_LIST_RLOCK_NOSLEEP(); 2194 VNET_FOREACH(vnet_iter) { 2195 CURVNET_SET(vnet_iter); 2196 igmp_slowtimo_vnet(); 2197 CURVNET_RESTORE(); 2198 } 2199 VNET_LIST_RUNLOCK_NOSLEEP(); 2200 } 2201 2202 /* 2203 * Per-vnet slowtimo handler. 2204 */ 2205 static void 2206 igmp_slowtimo_vnet(void) 2207 { 2208 struct igmp_ifsoftc *igi; 2209 2210 IGMP_LOCK(); 2211 2212 LIST_FOREACH(igi, &V_igi_head, igi_link) { 2213 igmp_v1v2_process_querier_timers(igi); 2214 } 2215 2216 IGMP_UNLOCK(); 2217 } 2218 2219 /* 2220 * Dispatch an IGMPv1/v2 host report or leave message. 2221 * These are always small enough to fit inside a single mbuf. 2222 */ 2223 static int 2224 igmp_v1v2_queue_report(struct in_multi *inm, const int type) 2225 { 2226 struct ifnet *ifp; 2227 struct igmp *igmp; 2228 struct ip *ip; 2229 struct mbuf *m; 2230 2231 IN_MULTI_LOCK_ASSERT(); 2232 IGMP_LOCK_ASSERT(); 2233 2234 ifp = inm->inm_ifp; 2235 2236 m = m_gethdr(M_NOWAIT, MT_DATA); 2237 if (m == NULL) 2238 return (ENOMEM); 2239 M_ALIGN(m, sizeof(struct ip) + sizeof(struct igmp)); 2240 2241 m->m_pkthdr.len = sizeof(struct ip) + sizeof(struct igmp); 2242 2243 m->m_data += sizeof(struct ip); 2244 m->m_len = sizeof(struct igmp); 2245 2246 igmp = mtod(m, struct igmp *); 2247 igmp->igmp_type = type; 2248 igmp->igmp_code = 0; 2249 igmp->igmp_group = inm->inm_addr; 2250 igmp->igmp_cksum = 0; 2251 igmp->igmp_cksum = in_cksum(m, sizeof(struct igmp)); 2252 2253 m->m_data -= sizeof(struct ip); 2254 m->m_len += sizeof(struct ip); 2255 2256 ip = mtod(m, struct ip *); 2257 ip->ip_tos = 0; 2258 ip->ip_len = htons(sizeof(struct ip) + sizeof(struct igmp)); 2259 ip->ip_off = 0; 2260 ip->ip_p = IPPROTO_IGMP; 2261 ip->ip_src.s_addr = INADDR_ANY; 2262 2263 if (type == IGMP_HOST_LEAVE_MESSAGE) 2264 ip->ip_dst.s_addr = htonl(INADDR_ALLRTRS_GROUP); 2265 else 2266 ip->ip_dst = inm->inm_addr; 2267 2268 igmp_save_context(m, ifp); 2269 2270 m->m_flags |= M_IGMPV2; 2271 if (inm->inm_igi->igi_flags & IGIF_LOOPBACK) 2272 m->m_flags |= M_IGMP_LOOP; 2273 2274 CTR2(KTR_IGMPV3, "%s: netisr_dispatch(NETISR_IGMP, %p)", __func__, m); 2275 netisr_dispatch(NETISR_IGMP, m); 2276 2277 return (0); 2278 } 2279 2280 /* 2281 * Process a state change from the upper layer for the given IPv4 group. 2282 * 2283 * Each socket holds a reference on the in_multi in its own ip_moptions. 2284 * The socket layer will have made the necessary updates to.the group 2285 * state, it is now up to IGMP to issue a state change report if there 2286 * has been any change between T0 (when the last state-change was issued) 2287 * and T1 (now). 2288 * 2289 * We use the IGMPv3 state machine at group level. The IGMP module 2290 * however makes the decision as to which IGMP protocol version to speak. 2291 * A state change *from* INCLUDE {} always means an initial join. 2292 * A state change *to* INCLUDE {} always means a final leave. 2293 * 2294 * FUTURE: If IGIF_V3LITE is enabled for this interface, then we can 2295 * save ourselves a bunch of work; any exclusive mode groups need not 2296 * compute source filter lists. 2297 * 2298 * VIMAGE: curvnet should have been set by caller, as this routine 2299 * is called from the socket option handlers. 2300 */ 2301 int 2302 igmp_change_state(struct in_multi *inm) 2303 { 2304 struct igmp_ifsoftc *igi; 2305 struct ifnet *ifp; 2306 int error; 2307 2308 IN_MULTI_LOCK_ASSERT(); 2309 2310 error = 0; 2311 2312 /* 2313 * Try to detect if the upper layer just asked us to change state 2314 * for an interface which has now gone away. 2315 */ 2316 KASSERT(inm->inm_ifma != NULL, ("%s: no ifma", __func__)); 2317 ifp = inm->inm_ifma->ifma_ifp; 2318 /* 2319 * Sanity check that netinet's notion of ifp is the 2320 * same as net's. 2321 */ 2322 KASSERT(inm->inm_ifp == ifp, ("%s: bad ifp", __func__)); 2323 2324 IGMP_LOCK(); 2325 2326 igi = ((struct in_ifinfo *)ifp->if_afdata[AF_INET])->ii_igmp; 2327 KASSERT(igi != NULL, ("%s: no igmp_ifsoftc for ifp %p", __func__, ifp)); 2328 2329 /* 2330 * If we detect a state transition to or from MCAST_UNDEFINED 2331 * for this group, then we are starting or finishing an IGMP 2332 * life cycle for this group. 2333 */ 2334 if (inm->inm_st[1].iss_fmode != inm->inm_st[0].iss_fmode) { 2335 CTR3(KTR_IGMPV3, "%s: inm transition %d -> %d", __func__, 2336 inm->inm_st[0].iss_fmode, inm->inm_st[1].iss_fmode); 2337 if (inm->inm_st[0].iss_fmode == MCAST_UNDEFINED) { 2338 CTR1(KTR_IGMPV3, "%s: initial join", __func__); 2339 error = igmp_initial_join(inm, igi); 2340 goto out_locked; 2341 } else if (inm->inm_st[1].iss_fmode == MCAST_UNDEFINED) { 2342 CTR1(KTR_IGMPV3, "%s: final leave", __func__); 2343 igmp_final_leave(inm, igi); 2344 goto out_locked; 2345 } 2346 } else { 2347 CTR1(KTR_IGMPV3, "%s: filter set change", __func__); 2348 } 2349 2350 error = igmp_handle_state_change(inm, igi); 2351 2352 out_locked: 2353 IGMP_UNLOCK(); 2354 return (error); 2355 } 2356 2357 /* 2358 * Perform the initial join for an IGMP group. 2359 * 2360 * When joining a group: 2361 * If the group should have its IGMP traffic suppressed, do nothing. 2362 * IGMPv1 starts sending IGMPv1 host membership reports. 2363 * IGMPv2 starts sending IGMPv2 host membership reports. 2364 * IGMPv3 will schedule an IGMPv3 state-change report containing the 2365 * initial state of the membership. 2366 */ 2367 static int 2368 igmp_initial_join(struct in_multi *inm, struct igmp_ifsoftc *igi) 2369 { 2370 struct ifnet *ifp; 2371 struct mbufq *mq; 2372 int error, retval, syncstates; 2373 #ifdef KTR 2374 char addrbuf[INET_ADDRSTRLEN]; 2375 #endif 2376 2377 CTR4(KTR_IGMPV3, "%s: initial join %s on ifp %p(%s)", 2378 __func__, inet_ntoa_r(inm->inm_addr, addrbuf), inm->inm_ifp, 2379 inm->inm_ifp->if_xname); 2380 2381 error = 0; 2382 syncstates = 1; 2383 2384 ifp = inm->inm_ifp; 2385 2386 IN_MULTI_LOCK_ASSERT(); 2387 IGMP_LOCK_ASSERT(); 2388 2389 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2390 2391 /* 2392 * Groups joined on loopback or marked as 'not reported', 2393 * e.g. 224.0.0.1, enter the IGMP_SILENT_MEMBER state and 2394 * are never reported in any IGMP protocol exchanges. 2395 * All other groups enter the appropriate IGMP state machine 2396 * for the version in use on this link. 2397 * A link marked as IGIF_SILENT causes IGMP to be completely 2398 * disabled for the link. 2399 */ 2400 if ((ifp->if_flags & IFF_LOOPBACK) || 2401 (igi->igi_flags & IGIF_SILENT) || 2402 !igmp_isgroupreported(inm->inm_addr)) { 2403 CTR1(KTR_IGMPV3, 2404 "%s: not kicking state machine for silent group", __func__); 2405 inm->inm_state = IGMP_SILENT_MEMBER; 2406 inm->inm_timer = 0; 2407 } else { 2408 /* 2409 * Deal with overlapping in_multi lifecycle. 2410 * If this group was LEAVING, then make sure 2411 * we drop the reference we picked up to keep the 2412 * group around for the final INCLUDE {} enqueue. 2413 */ 2414 if (igi->igi_version == IGMP_VERSION_3 && 2415 inm->inm_state == IGMP_LEAVING_MEMBER) 2416 inm_release_locked(inm); 2417 2418 inm->inm_state = IGMP_REPORTING_MEMBER; 2419 2420 switch (igi->igi_version) { 2421 case IGMP_VERSION_1: 2422 case IGMP_VERSION_2: 2423 inm->inm_state = IGMP_IDLE_MEMBER; 2424 error = igmp_v1v2_queue_report(inm, 2425 (igi->igi_version == IGMP_VERSION_2) ? 2426 IGMP_v2_HOST_MEMBERSHIP_REPORT : 2427 IGMP_v1_HOST_MEMBERSHIP_REPORT); 2428 if (error == 0) { 2429 inm->inm_timer = IGMP_RANDOM_DELAY( 2430 IGMP_V1V2_MAX_RI * PR_FASTHZ); 2431 V_current_state_timers_running = 1; 2432 } 2433 break; 2434 2435 case IGMP_VERSION_3: 2436 /* 2437 * Defer update of T0 to T1, until the first copy 2438 * of the state change has been transmitted. 2439 */ 2440 syncstates = 0; 2441 2442 /* 2443 * Immediately enqueue a State-Change Report for 2444 * this interface, freeing any previous reports. 2445 * Don't kick the timers if there is nothing to do, 2446 * or if an error occurred. 2447 */ 2448 mq = &inm->inm_scq; 2449 mbufq_drain(mq); 2450 retval = igmp_v3_enqueue_group_record(mq, inm, 1, 2451 0, 0); 2452 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 2453 __func__, retval); 2454 if (retval <= 0) { 2455 error = retval * -1; 2456 break; 2457 } 2458 2459 /* 2460 * Schedule transmission of pending state-change 2461 * report up to RV times for this link. The timer 2462 * will fire at the next igmp_fasttimo (~200ms), 2463 * giving us an opportunity to merge the reports. 2464 */ 2465 if (igi->igi_flags & IGIF_LOOPBACK) { 2466 inm->inm_scrv = 1; 2467 } else { 2468 KASSERT(igi->igi_rv > 1, 2469 ("%s: invalid robustness %d", __func__, 2470 igi->igi_rv)); 2471 inm->inm_scrv = igi->igi_rv; 2472 } 2473 inm->inm_sctimer = 1; 2474 V_state_change_timers_running = 1; 2475 2476 error = 0; 2477 break; 2478 } 2479 } 2480 2481 /* 2482 * Only update the T0 state if state change is atomic, 2483 * i.e. we don't need to wait for a timer to fire before we 2484 * can consider the state change to have been communicated. 2485 */ 2486 if (syncstates) { 2487 inm_commit(inm); 2488 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__, 2489 inet_ntoa_r(inm->inm_addr, addrbuf), 2490 inm->inm_ifp->if_xname); 2491 } 2492 2493 return (error); 2494 } 2495 2496 /* 2497 * Issue an intermediate state change during the IGMP life-cycle. 2498 */ 2499 static int 2500 igmp_handle_state_change(struct in_multi *inm, struct igmp_ifsoftc *igi) 2501 { 2502 struct ifnet *ifp; 2503 int retval; 2504 #ifdef KTR 2505 char addrbuf[INET_ADDRSTRLEN]; 2506 #endif 2507 2508 CTR4(KTR_IGMPV3, "%s: state change for %s on ifp %p(%s)", 2509 __func__, inet_ntoa_r(inm->inm_addr, addrbuf), inm->inm_ifp, 2510 inm->inm_ifp->if_xname); 2511 2512 ifp = inm->inm_ifp; 2513 2514 IN_MULTI_LOCK_ASSERT(); 2515 IGMP_LOCK_ASSERT(); 2516 2517 KASSERT(igi && igi->igi_ifp == ifp, ("%s: inconsistent ifp", __func__)); 2518 2519 if ((ifp->if_flags & IFF_LOOPBACK) || 2520 (igi->igi_flags & IGIF_SILENT) || 2521 !igmp_isgroupreported(inm->inm_addr) || 2522 (igi->igi_version != IGMP_VERSION_3)) { 2523 if (!igmp_isgroupreported(inm->inm_addr)) { 2524 CTR1(KTR_IGMPV3, 2525 "%s: not kicking state machine for silent group", __func__); 2526 } 2527 CTR1(KTR_IGMPV3, "%s: nothing to do", __func__); 2528 inm_commit(inm); 2529 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__, 2530 inet_ntoa_r(inm->inm_addr, addrbuf), 2531 inm->inm_ifp->if_xname); 2532 return (0); 2533 } 2534 2535 mbufq_drain(&inm->inm_scq); 2536 2537 retval = igmp_v3_enqueue_group_record(&inm->inm_scq, inm, 1, 0, 0); 2538 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", __func__, retval); 2539 if (retval <= 0) 2540 return (-retval); 2541 2542 /* 2543 * If record(s) were enqueued, start the state-change 2544 * report timer for this group. 2545 */ 2546 inm->inm_scrv = ((igi->igi_flags & IGIF_LOOPBACK) ? 1 : igi->igi_rv); 2547 inm->inm_sctimer = 1; 2548 V_state_change_timers_running = 1; 2549 2550 return (0); 2551 } 2552 2553 /* 2554 * Perform the final leave for an IGMP group. 2555 * 2556 * When leaving a group: 2557 * IGMPv1 does nothing. 2558 * IGMPv2 sends a host leave message, if and only if we are the reporter. 2559 * IGMPv3 enqueues a state-change report containing a transition 2560 * to INCLUDE {} for immediate transmission. 2561 */ 2562 static void 2563 igmp_final_leave(struct in_multi *inm, struct igmp_ifsoftc *igi) 2564 { 2565 int syncstates; 2566 #ifdef KTR 2567 char addrbuf[INET_ADDRSTRLEN]; 2568 #endif 2569 2570 syncstates = 1; 2571 2572 CTR4(KTR_IGMPV3, "%s: final leave %s on ifp %p(%s)", 2573 __func__, inet_ntoa_r(inm->inm_addr, addrbuf), inm->inm_ifp, 2574 inm->inm_ifp->if_xname); 2575 2576 IN_MULTI_LOCK_ASSERT(); 2577 IGMP_LOCK_ASSERT(); 2578 2579 switch (inm->inm_state) { 2580 case IGMP_NOT_MEMBER: 2581 case IGMP_SILENT_MEMBER: 2582 case IGMP_LEAVING_MEMBER: 2583 /* Already leaving or left; do nothing. */ 2584 CTR1(KTR_IGMPV3, 2585 "%s: not kicking state machine for silent group", __func__); 2586 break; 2587 case IGMP_REPORTING_MEMBER: 2588 case IGMP_IDLE_MEMBER: 2589 case IGMP_G_QUERY_PENDING_MEMBER: 2590 case IGMP_SG_QUERY_PENDING_MEMBER: 2591 if (igi->igi_version == IGMP_VERSION_2) { 2592 #ifdef INVARIANTS 2593 if (inm->inm_state == IGMP_G_QUERY_PENDING_MEMBER || 2594 inm->inm_state == IGMP_SG_QUERY_PENDING_MEMBER) 2595 panic("%s: IGMPv3 state reached, not IGMPv3 mode", 2596 __func__); 2597 #endif 2598 igmp_v1v2_queue_report(inm, IGMP_HOST_LEAVE_MESSAGE); 2599 inm->inm_state = IGMP_NOT_MEMBER; 2600 } else if (igi->igi_version == IGMP_VERSION_3) { 2601 /* 2602 * Stop group timer and all pending reports. 2603 * Immediately enqueue a state-change report 2604 * TO_IN {} to be sent on the next fast timeout, 2605 * giving us an opportunity to merge reports. 2606 */ 2607 mbufq_drain(&inm->inm_scq); 2608 inm->inm_timer = 0; 2609 if (igi->igi_flags & IGIF_LOOPBACK) { 2610 inm->inm_scrv = 1; 2611 } else { 2612 inm->inm_scrv = igi->igi_rv; 2613 } 2614 CTR4(KTR_IGMPV3, "%s: Leaving %s/%s with %d " 2615 "pending retransmissions.", __func__, 2616 inet_ntoa_r(inm->inm_addr, addrbuf), 2617 inm->inm_ifp->if_xname, inm->inm_scrv); 2618 if (inm->inm_scrv == 0) { 2619 inm->inm_state = IGMP_NOT_MEMBER; 2620 inm->inm_sctimer = 0; 2621 } else { 2622 int retval; 2623 2624 inm_acquire_locked(inm); 2625 2626 retval = igmp_v3_enqueue_group_record( 2627 &inm->inm_scq, inm, 1, 0, 0); 2628 KASSERT(retval != 0, 2629 ("%s: enqueue record = %d", __func__, 2630 retval)); 2631 2632 inm->inm_state = IGMP_LEAVING_MEMBER; 2633 inm->inm_sctimer = 1; 2634 V_state_change_timers_running = 1; 2635 syncstates = 0; 2636 } 2637 break; 2638 } 2639 break; 2640 case IGMP_LAZY_MEMBER: 2641 case IGMP_SLEEPING_MEMBER: 2642 case IGMP_AWAKENING_MEMBER: 2643 /* Our reports are suppressed; do nothing. */ 2644 break; 2645 } 2646 2647 if (syncstates) { 2648 inm_commit(inm); 2649 CTR3(KTR_IGMPV3, "%s: T1 -> T0 for %s/%s", __func__, 2650 inet_ntoa_r(inm->inm_addr, addrbuf), 2651 inm->inm_ifp->if_xname); 2652 inm->inm_st[1].iss_fmode = MCAST_UNDEFINED; 2653 CTR3(KTR_IGMPV3, "%s: T1 now MCAST_UNDEFINED for %s/%s", 2654 __func__, inet_ntoa_r(inm->inm_addr, addrbuf), 2655 inm->inm_ifp->if_xname); 2656 } 2657 } 2658 2659 /* 2660 * Enqueue an IGMPv3 group record to the given output queue. 2661 * 2662 * XXX This function could do with having the allocation code 2663 * split out, and the multiple-tree-walks coalesced into a single 2664 * routine as has been done in igmp_v3_enqueue_filter_change(). 2665 * 2666 * If is_state_change is zero, a current-state record is appended. 2667 * If is_state_change is non-zero, a state-change report is appended. 2668 * 2669 * If is_group_query is non-zero, an mbuf packet chain is allocated. 2670 * If is_group_query is zero, and if there is a packet with free space 2671 * at the tail of the queue, it will be appended to providing there 2672 * is enough free space. 2673 * Otherwise a new mbuf packet chain is allocated. 2674 * 2675 * If is_source_query is non-zero, each source is checked to see if 2676 * it was recorded for a Group-Source query, and will be omitted if 2677 * it is not both in-mode and recorded. 2678 * 2679 * The function will attempt to allocate leading space in the packet 2680 * for the IP/IGMP header to be prepended without fragmenting the chain. 2681 * 2682 * If successful the size of all data appended to the queue is returned, 2683 * otherwise an error code less than zero is returned, or zero if 2684 * no record(s) were appended. 2685 */ 2686 static int 2687 igmp_v3_enqueue_group_record(struct mbufq *mq, struct in_multi *inm, 2688 const int is_state_change, const int is_group_query, 2689 const int is_source_query) 2690 { 2691 struct igmp_grouprec ig; 2692 struct igmp_grouprec *pig; 2693 struct ifnet *ifp; 2694 struct ip_msource *ims, *nims; 2695 struct mbuf *m0, *m, *md; 2696 int error, is_filter_list_change; 2697 int minrec0len, m0srcs, msrcs, nbytes, off; 2698 int record_has_sources; 2699 int now; 2700 int type; 2701 in_addr_t naddr; 2702 uint8_t mode; 2703 #ifdef KTR 2704 char addrbuf[INET_ADDRSTRLEN]; 2705 #endif 2706 2707 IN_MULTI_LOCK_ASSERT(); 2708 2709 error = 0; 2710 ifp = inm->inm_ifp; 2711 is_filter_list_change = 0; 2712 m = NULL; 2713 m0 = NULL; 2714 m0srcs = 0; 2715 msrcs = 0; 2716 nbytes = 0; 2717 nims = NULL; 2718 record_has_sources = 1; 2719 pig = NULL; 2720 type = IGMP_DO_NOTHING; 2721 mode = inm->inm_st[1].iss_fmode; 2722 2723 /* 2724 * If we did not transition out of ASM mode during t0->t1, 2725 * and there are no source nodes to process, we can skip 2726 * the generation of source records. 2727 */ 2728 if (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0 && 2729 inm->inm_nsrc == 0) 2730 record_has_sources = 0; 2731 2732 if (is_state_change) { 2733 /* 2734 * Queue a state change record. 2735 * If the mode did not change, and there are non-ASM 2736 * listeners or source filters present, 2737 * we potentially need to issue two records for the group. 2738 * If we are transitioning to MCAST_UNDEFINED, we need 2739 * not send any sources. 2740 * If there are ASM listeners, and there was no filter 2741 * mode transition of any kind, do nothing. 2742 */ 2743 if (mode != inm->inm_st[0].iss_fmode) { 2744 if (mode == MCAST_EXCLUDE) { 2745 CTR1(KTR_IGMPV3, "%s: change to EXCLUDE", 2746 __func__); 2747 type = IGMP_CHANGE_TO_EXCLUDE_MODE; 2748 } else { 2749 CTR1(KTR_IGMPV3, "%s: change to INCLUDE", 2750 __func__); 2751 type = IGMP_CHANGE_TO_INCLUDE_MODE; 2752 if (mode == MCAST_UNDEFINED) 2753 record_has_sources = 0; 2754 } 2755 } else { 2756 if (record_has_sources) { 2757 is_filter_list_change = 1; 2758 } else { 2759 type = IGMP_DO_NOTHING; 2760 } 2761 } 2762 } else { 2763 /* 2764 * Queue a current state record. 2765 */ 2766 if (mode == MCAST_EXCLUDE) { 2767 type = IGMP_MODE_IS_EXCLUDE; 2768 } else if (mode == MCAST_INCLUDE) { 2769 type = IGMP_MODE_IS_INCLUDE; 2770 KASSERT(inm->inm_st[1].iss_asm == 0, 2771 ("%s: inm %p is INCLUDE but ASM count is %d", 2772 __func__, inm, inm->inm_st[1].iss_asm)); 2773 } 2774 } 2775 2776 /* 2777 * Generate the filter list changes using a separate function. 2778 */ 2779 if (is_filter_list_change) 2780 return (igmp_v3_enqueue_filter_change(mq, inm)); 2781 2782 if (type == IGMP_DO_NOTHING) { 2783 CTR3(KTR_IGMPV3, "%s: nothing to do for %s/%s", 2784 __func__, inet_ntoa_r(inm->inm_addr, addrbuf), 2785 inm->inm_ifp->if_xname); 2786 return (0); 2787 } 2788 2789 /* 2790 * If any sources are present, we must be able to fit at least 2791 * one in the trailing space of the tail packet's mbuf, 2792 * ideally more. 2793 */ 2794 minrec0len = sizeof(struct igmp_grouprec); 2795 if (record_has_sources) 2796 minrec0len += sizeof(in_addr_t); 2797 2798 CTR4(KTR_IGMPV3, "%s: queueing %s for %s/%s", __func__, 2799 igmp_rec_type_to_str(type), inet_ntoa_r(inm->inm_addr, addrbuf), 2800 inm->inm_ifp->if_xname); 2801 2802 /* 2803 * Check if we have a packet in the tail of the queue for this 2804 * group into which the first group record for this group will fit. 2805 * Otherwise allocate a new packet. 2806 * Always allocate leading space for IP+RA_OPT+IGMP+REPORT. 2807 * Note: Group records for G/GSR query responses MUST be sent 2808 * in their own packet. 2809 */ 2810 m0 = mbufq_last(mq); 2811 if (!is_group_query && 2812 m0 != NULL && 2813 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= IGMP_V3_REPORT_MAXRECS) && 2814 (m0->m_pkthdr.len + minrec0len) < 2815 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 2816 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 2817 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2818 m = m0; 2819 CTR1(KTR_IGMPV3, "%s: use existing packet", __func__); 2820 } else { 2821 if (mbufq_full(mq)) { 2822 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2823 return (-ENOMEM); 2824 } 2825 m = NULL; 2826 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2827 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2828 if (!is_state_change && !is_group_query) { 2829 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2830 if (m) 2831 m->m_data += IGMP_LEADINGSPACE; 2832 } 2833 if (m == NULL) { 2834 m = m_gethdr(M_NOWAIT, MT_DATA); 2835 if (m) 2836 M_ALIGN(m, IGMP_LEADINGSPACE); 2837 } 2838 if (m == NULL) 2839 return (-ENOMEM); 2840 2841 igmp_save_context(m, ifp); 2842 2843 CTR1(KTR_IGMPV3, "%s: allocated first packet", __func__); 2844 } 2845 2846 /* 2847 * Append group record. 2848 * If we have sources, we don't know how many yet. 2849 */ 2850 ig.ig_type = type; 2851 ig.ig_datalen = 0; 2852 ig.ig_numsrc = 0; 2853 ig.ig_group = inm->inm_addr; 2854 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2855 if (m != m0) 2856 m_freem(m); 2857 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2858 return (-ENOMEM); 2859 } 2860 nbytes += sizeof(struct igmp_grouprec); 2861 2862 /* 2863 * Append as many sources as will fit in the first packet. 2864 * If we are appending to a new packet, the chain allocation 2865 * may potentially use clusters; use m_getptr() in this case. 2866 * If we are appending to an existing packet, we need to obtain 2867 * a pointer to the group record after m_append(), in case a new 2868 * mbuf was allocated. 2869 * Only append sources which are in-mode at t1. If we are 2870 * transitioning to MCAST_UNDEFINED state on the group, do not 2871 * include source entries. 2872 * Only report recorded sources in our filter set when responding 2873 * to a group-source query. 2874 */ 2875 if (record_has_sources) { 2876 if (m == m0) { 2877 md = m_last(m); 2878 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2879 md->m_len - nbytes); 2880 } else { 2881 md = m_getptr(m, 0, &off); 2882 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + 2883 off); 2884 } 2885 msrcs = 0; 2886 RB_FOREACH_SAFE(ims, ip_msource_tree, &inm->inm_srcs, nims) { 2887 CTR2(KTR_IGMPV3, "%s: visit node %s", __func__, 2888 inet_ntoa_haddr(ims->ims_haddr, addrbuf)); 2889 now = ims_get_mode(inm, ims, 1); 2890 CTR2(KTR_IGMPV3, "%s: node is %d", __func__, now); 2891 if ((now != mode) || 2892 (now == mode && mode == MCAST_UNDEFINED)) { 2893 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2894 continue; 2895 } 2896 if (is_source_query && ims->ims_stp == 0) { 2897 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2898 __func__); 2899 continue; 2900 } 2901 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2902 naddr = htonl(ims->ims_haddr); 2903 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2904 if (m != m0) 2905 m_freem(m); 2906 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 2907 __func__); 2908 return (-ENOMEM); 2909 } 2910 nbytes += sizeof(in_addr_t); 2911 ++msrcs; 2912 if (msrcs == m0srcs) 2913 break; 2914 } 2915 CTR2(KTR_IGMPV3, "%s: msrcs is %d this packet", __func__, 2916 msrcs); 2917 pig->ig_numsrc = htons(msrcs); 2918 nbytes += (msrcs * sizeof(in_addr_t)); 2919 } 2920 2921 if (is_source_query && msrcs == 0) { 2922 CTR1(KTR_IGMPV3, "%s: no recorded sources to report", __func__); 2923 if (m != m0) 2924 m_freem(m); 2925 return (0); 2926 } 2927 2928 /* 2929 * We are good to go with first packet. 2930 */ 2931 if (m != m0) { 2932 CTR1(KTR_IGMPV3, "%s: enqueueing first packet", __func__); 2933 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2934 mbufq_enqueue(mq, m); 2935 } else 2936 m->m_pkthdr.PH_vt.vt_nrecs++; 2937 2938 /* 2939 * No further work needed if no source list in packet(s). 2940 */ 2941 if (!record_has_sources) 2942 return (nbytes); 2943 2944 /* 2945 * Whilst sources remain to be announced, we need to allocate 2946 * a new packet and fill out as many sources as will fit. 2947 * Always try for a cluster first. 2948 */ 2949 while (nims != NULL) { 2950 if (mbufq_full(mq)) { 2951 CTR1(KTR_IGMPV3, "%s: outbound queue full", __func__); 2952 return (-ENOMEM); 2953 } 2954 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2955 if (m) 2956 m->m_data += IGMP_LEADINGSPACE; 2957 if (m == NULL) { 2958 m = m_gethdr(M_NOWAIT, MT_DATA); 2959 if (m) 2960 M_ALIGN(m, IGMP_LEADINGSPACE); 2961 } 2962 if (m == NULL) 2963 return (-ENOMEM); 2964 igmp_save_context(m, ifp); 2965 md = m_getptr(m, 0, &off); 2966 pig = (struct igmp_grouprec *)(mtod(md, uint8_t *) + off); 2967 CTR1(KTR_IGMPV3, "%s: allocated next packet", __func__); 2968 2969 if (!m_append(m, sizeof(struct igmp_grouprec), (void *)&ig)) { 2970 if (m != m0) 2971 m_freem(m); 2972 CTR1(KTR_IGMPV3, "%s: m_append() failed.", __func__); 2973 return (-ENOMEM); 2974 } 2975 m->m_pkthdr.PH_vt.vt_nrecs = 1; 2976 nbytes += sizeof(struct igmp_grouprec); 2977 2978 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 2979 sizeof(struct igmp_grouprec)) / sizeof(in_addr_t); 2980 2981 msrcs = 0; 2982 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 2983 CTR2(KTR_IGMPV3, "%s: visit node %s", __func__, 2984 inet_ntoa_haddr(ims->ims_haddr, addrbuf)); 2985 now = ims_get_mode(inm, ims, 1); 2986 if ((now != mode) || 2987 (now == mode && mode == MCAST_UNDEFINED)) { 2988 CTR1(KTR_IGMPV3, "%s: skip node", __func__); 2989 continue; 2990 } 2991 if (is_source_query && ims->ims_stp == 0) { 2992 CTR1(KTR_IGMPV3, "%s: skip unrecorded node", 2993 __func__); 2994 continue; 2995 } 2996 CTR1(KTR_IGMPV3, "%s: append node", __func__); 2997 naddr = htonl(ims->ims_haddr); 2998 if (!m_append(m, sizeof(in_addr_t), (void *)&naddr)) { 2999 if (m != m0) 3000 m_freem(m); 3001 CTR1(KTR_IGMPV3, "%s: m_append() failed.", 3002 __func__); 3003 return (-ENOMEM); 3004 } 3005 ++msrcs; 3006 if (msrcs == m0srcs) 3007 break; 3008 } 3009 pig->ig_numsrc = htons(msrcs); 3010 nbytes += (msrcs * sizeof(in_addr_t)); 3011 3012 CTR1(KTR_IGMPV3, "%s: enqueueing next packet", __func__); 3013 mbufq_enqueue(mq, m); 3014 } 3015 3016 return (nbytes); 3017 } 3018 3019 /* 3020 * Type used to mark record pass completion. 3021 * We exploit the fact we can cast to this easily from the 3022 * current filter modes on each ip_msource node. 3023 */ 3024 typedef enum { 3025 REC_NONE = 0x00, /* MCAST_UNDEFINED */ 3026 REC_ALLOW = 0x01, /* MCAST_INCLUDE */ 3027 REC_BLOCK = 0x02, /* MCAST_EXCLUDE */ 3028 REC_FULL = REC_ALLOW | REC_BLOCK 3029 } rectype_t; 3030 3031 /* 3032 * Enqueue an IGMPv3 filter list change to the given output queue. 3033 * 3034 * Source list filter state is held in an RB-tree. When the filter list 3035 * for a group is changed without changing its mode, we need to compute 3036 * the deltas between T0 and T1 for each source in the filter set, 3037 * and enqueue the appropriate ALLOW_NEW/BLOCK_OLD records. 3038 * 3039 * As we may potentially queue two record types, and the entire R-B tree 3040 * needs to be walked at once, we break this out into its own function 3041 * so we can generate a tightly packed queue of packets. 3042 * 3043 * XXX This could be written to only use one tree walk, although that makes 3044 * serializing into the mbuf chains a bit harder. For now we do two walks 3045 * which makes things easier on us, and it may or may not be harder on 3046 * the L2 cache. 3047 * 3048 * If successful the size of all data appended to the queue is returned, 3049 * otherwise an error code less than zero is returned, or zero if 3050 * no record(s) were appended. 3051 */ 3052 static int 3053 igmp_v3_enqueue_filter_change(struct mbufq *mq, struct in_multi *inm) 3054 { 3055 static const int MINRECLEN = 3056 sizeof(struct igmp_grouprec) + sizeof(in_addr_t); 3057 struct ifnet *ifp; 3058 struct igmp_grouprec ig; 3059 struct igmp_grouprec *pig; 3060 struct ip_msource *ims, *nims; 3061 struct mbuf *m, *m0, *md; 3062 in_addr_t naddr; 3063 int m0srcs, nbytes, npbytes, off, rsrcs, schanged; 3064 int nallow, nblock; 3065 uint8_t mode, now, then; 3066 rectype_t crt, drt, nrt; 3067 #ifdef KTR 3068 char addrbuf[INET_ADDRSTRLEN]; 3069 #endif 3070 3071 IN_MULTI_LOCK_ASSERT(); 3072 3073 if (inm->inm_nsrc == 0 || 3074 (inm->inm_st[0].iss_asm > 0 && inm->inm_st[1].iss_asm > 0)) 3075 return (0); 3076 3077 ifp = inm->inm_ifp; /* interface */ 3078 mode = inm->inm_st[1].iss_fmode; /* filter mode at t1 */ 3079 crt = REC_NONE; /* current group record type */ 3080 drt = REC_NONE; /* mask of completed group record types */ 3081 nrt = REC_NONE; /* record type for current node */ 3082 m0srcs = 0; /* # source which will fit in current mbuf chain */ 3083 nbytes = 0; /* # of bytes appended to group's state-change queue */ 3084 npbytes = 0; /* # of bytes appended this packet */ 3085 rsrcs = 0; /* # sources encoded in current record */ 3086 schanged = 0; /* # nodes encoded in overall filter change */ 3087 nallow = 0; /* # of source entries in ALLOW_NEW */ 3088 nblock = 0; /* # of source entries in BLOCK_OLD */ 3089 nims = NULL; /* next tree node pointer */ 3090 3091 /* 3092 * For each possible filter record mode. 3093 * The first kind of source we encounter tells us which 3094 * is the first kind of record we start appending. 3095 * If a node transitioned to UNDEFINED at t1, its mode is treated 3096 * as the inverse of the group's filter mode. 3097 */ 3098 while (drt != REC_FULL) { 3099 do { 3100 m0 = mbufq_last(mq); 3101 if (m0 != NULL && 3102 (m0->m_pkthdr.PH_vt.vt_nrecs + 1 <= 3103 IGMP_V3_REPORT_MAXRECS) && 3104 (m0->m_pkthdr.len + MINRECLEN) < 3105 (ifp->if_mtu - IGMP_LEADINGSPACE)) { 3106 m = m0; 3107 m0srcs = (ifp->if_mtu - m0->m_pkthdr.len - 3108 sizeof(struct igmp_grouprec)) / 3109 sizeof(in_addr_t); 3110 CTR1(KTR_IGMPV3, 3111 "%s: use previous packet", __func__); 3112 } else { 3113 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 3114 if (m) 3115 m->m_data += IGMP_LEADINGSPACE; 3116 if (m == NULL) { 3117 m = m_gethdr(M_NOWAIT, MT_DATA); 3118 if (m) 3119 M_ALIGN(m, IGMP_LEADINGSPACE); 3120 } 3121 if (m == NULL) { 3122 CTR1(KTR_IGMPV3, 3123 "%s: m_get*() failed", __func__); 3124 return (-ENOMEM); 3125 } 3126 m->m_pkthdr.PH_vt.vt_nrecs = 0; 3127 igmp_save_context(m, ifp); 3128 m0srcs = (ifp->if_mtu - IGMP_LEADINGSPACE - 3129 sizeof(struct igmp_grouprec)) / 3130 sizeof(in_addr_t); 3131 npbytes = 0; 3132 CTR1(KTR_IGMPV3, 3133 "%s: allocated new packet", __func__); 3134 } 3135 /* 3136 * Append the IGMP group record header to the 3137 * current packet's data area. 3138 * Recalculate pointer to free space for next 3139 * group record, in case m_append() allocated 3140 * a new mbuf or cluster. 3141 */ 3142 memset(&ig, 0, sizeof(ig)); 3143 ig.ig_group = inm->inm_addr; 3144 if (!m_append(m, sizeof(ig), (void *)&ig)) { 3145 if (m != m0) 3146 m_freem(m); 3147 CTR1(KTR_IGMPV3, 3148 "%s: m_append() failed", __func__); 3149 return (-ENOMEM); 3150 } 3151 npbytes += sizeof(struct igmp_grouprec); 3152 if (m != m0) { 3153 /* new packet; offset in c hain */ 3154 md = m_getptr(m, npbytes - 3155 sizeof(struct igmp_grouprec), &off); 3156 pig = (struct igmp_grouprec *)(mtod(md, 3157 uint8_t *) + off); 3158 } else { 3159 /* current packet; offset from last append */ 3160 md = m_last(m); 3161 pig = (struct igmp_grouprec *)(mtod(md, 3162 uint8_t *) + md->m_len - 3163 sizeof(struct igmp_grouprec)); 3164 } 3165 /* 3166 * Begin walking the tree for this record type 3167 * pass, or continue from where we left off 3168 * previously if we had to allocate a new packet. 3169 * Only report deltas in-mode at t1. 3170 * We need not report included sources as allowed 3171 * if we are in inclusive mode on the group, 3172 * however the converse is not true. 3173 */ 3174 rsrcs = 0; 3175 if (nims == NULL) 3176 nims = RB_MIN(ip_msource_tree, &inm->inm_srcs); 3177 RB_FOREACH_FROM(ims, ip_msource_tree, nims) { 3178 CTR2(KTR_IGMPV3, "%s: visit node %s", 3179 __func__, 3180 inet_ntoa_haddr(ims->ims_haddr, addrbuf)); 3181 now = ims_get_mode(inm, ims, 1); 3182 then = ims_get_mode(inm, ims, 0); 3183 CTR3(KTR_IGMPV3, "%s: mode: t0 %d, t1 %d", 3184 __func__, then, now); 3185 if (now == then) { 3186 CTR1(KTR_IGMPV3, 3187 "%s: skip unchanged", __func__); 3188 continue; 3189 } 3190 if (mode == MCAST_EXCLUDE && 3191 now == MCAST_INCLUDE) { 3192 CTR1(KTR_IGMPV3, 3193 "%s: skip IN src on EX group", 3194 __func__); 3195 continue; 3196 } 3197 nrt = (rectype_t)now; 3198 if (nrt == REC_NONE) 3199 nrt = (rectype_t)(~mode & REC_FULL); 3200 if (schanged++ == 0) { 3201 crt = nrt; 3202 } else if (crt != nrt) 3203 continue; 3204 naddr = htonl(ims->ims_haddr); 3205 if (!m_append(m, sizeof(in_addr_t), 3206 (void *)&naddr)) { 3207 if (m != m0) 3208 m_freem(m); 3209 CTR1(KTR_IGMPV3, 3210 "%s: m_append() failed", __func__); 3211 return (-ENOMEM); 3212 } 3213 nallow += !!(crt == REC_ALLOW); 3214 nblock += !!(crt == REC_BLOCK); 3215 if (++rsrcs == m0srcs) 3216 break; 3217 } 3218 /* 3219 * If we did not append any tree nodes on this 3220 * pass, back out of allocations. 3221 */ 3222 if (rsrcs == 0) { 3223 npbytes -= sizeof(struct igmp_grouprec); 3224 if (m != m0) { 3225 CTR1(KTR_IGMPV3, 3226 "%s: m_free(m)", __func__); 3227 m_freem(m); 3228 } else { 3229 CTR1(KTR_IGMPV3, 3230 "%s: m_adj(m, -ig)", __func__); 3231 m_adj(m, -((int)sizeof( 3232 struct igmp_grouprec))); 3233 } 3234 continue; 3235 } 3236 npbytes += (rsrcs * sizeof(in_addr_t)); 3237 if (crt == REC_ALLOW) 3238 pig->ig_type = IGMP_ALLOW_NEW_SOURCES; 3239 else if (crt == REC_BLOCK) 3240 pig->ig_type = IGMP_BLOCK_OLD_SOURCES; 3241 pig->ig_numsrc = htons(rsrcs); 3242 /* 3243 * Count the new group record, and enqueue this 3244 * packet if it wasn't already queued. 3245 */ 3246 m->m_pkthdr.PH_vt.vt_nrecs++; 3247 if (m != m0) 3248 mbufq_enqueue(mq, m); 3249 nbytes += npbytes; 3250 } while (nims != NULL); 3251 drt |= crt; 3252 crt = (~crt & REC_FULL); 3253 } 3254 3255 CTR3(KTR_IGMPV3, "%s: queued %d ALLOW_NEW, %d BLOCK_OLD", __func__, 3256 nallow, nblock); 3257 3258 return (nbytes); 3259 } 3260 3261 static int 3262 igmp_v3_merge_state_changes(struct in_multi *inm, struct mbufq *scq) 3263 { 3264 struct mbufq *gq; 3265 struct mbuf *m; /* pending state-change */ 3266 struct mbuf *m0; /* copy of pending state-change */ 3267 struct mbuf *mt; /* last state-change in packet */ 3268 int docopy, domerge; 3269 u_int recslen; 3270 3271 docopy = 0; 3272 domerge = 0; 3273 recslen = 0; 3274 3275 IN_MULTI_LOCK_ASSERT(); 3276 IGMP_LOCK_ASSERT(); 3277 3278 /* 3279 * If there are further pending retransmissions, make a writable 3280 * copy of each queued state-change message before merging. 3281 */ 3282 if (inm->inm_scrv > 0) 3283 docopy = 1; 3284 3285 gq = &inm->inm_scq; 3286 #ifdef KTR 3287 if (mbufq_first(gq) == NULL) { 3288 CTR2(KTR_IGMPV3, "%s: WARNING: queue for inm %p is empty", 3289 __func__, inm); 3290 } 3291 #endif 3292 3293 m = mbufq_first(gq); 3294 while (m != NULL) { 3295 /* 3296 * Only merge the report into the current packet if 3297 * there is sufficient space to do so; an IGMPv3 report 3298 * packet may only contain 65,535 group records. 3299 * Always use a simple mbuf chain concatentation to do this, 3300 * as large state changes for single groups may have 3301 * allocated clusters. 3302 */ 3303 domerge = 0; 3304 mt = mbufq_last(scq); 3305 if (mt != NULL) { 3306 recslen = m_length(m, NULL); 3307 3308 if ((mt->m_pkthdr.PH_vt.vt_nrecs + 3309 m->m_pkthdr.PH_vt.vt_nrecs <= 3310 IGMP_V3_REPORT_MAXRECS) && 3311 (mt->m_pkthdr.len + recslen <= 3312 (inm->inm_ifp->if_mtu - IGMP_LEADINGSPACE))) 3313 domerge = 1; 3314 } 3315 3316 if (!domerge && mbufq_full(gq)) { 3317 CTR2(KTR_IGMPV3, 3318 "%s: outbound queue full, skipping whole packet %p", 3319 __func__, m); 3320 mt = m->m_nextpkt; 3321 if (!docopy) 3322 m_freem(m); 3323 m = mt; 3324 continue; 3325 } 3326 3327 if (!docopy) { 3328 CTR2(KTR_IGMPV3, "%s: dequeueing %p", __func__, m); 3329 m0 = mbufq_dequeue(gq); 3330 m = m0->m_nextpkt; 3331 } else { 3332 CTR2(KTR_IGMPV3, "%s: copying %p", __func__, m); 3333 m0 = m_dup(m, M_NOWAIT); 3334 if (m0 == NULL) 3335 return (ENOMEM); 3336 m0->m_nextpkt = NULL; 3337 m = m->m_nextpkt; 3338 } 3339 3340 if (!domerge) { 3341 CTR3(KTR_IGMPV3, "%s: queueing %p to scq %p)", 3342 __func__, m0, scq); 3343 mbufq_enqueue(scq, m0); 3344 } else { 3345 struct mbuf *mtl; /* last mbuf of packet mt */ 3346 3347 CTR3(KTR_IGMPV3, "%s: merging %p with scq tail %p)", 3348 __func__, m0, mt); 3349 3350 mtl = m_last(mt); 3351 m0->m_flags &= ~M_PKTHDR; 3352 mt->m_pkthdr.len += recslen; 3353 mt->m_pkthdr.PH_vt.vt_nrecs += 3354 m0->m_pkthdr.PH_vt.vt_nrecs; 3355 3356 mtl->m_next = m0; 3357 } 3358 } 3359 3360 return (0); 3361 } 3362 3363 /* 3364 * Respond to a pending IGMPv3 General Query. 3365 */ 3366 static void 3367 igmp_v3_dispatch_general_query(struct igmp_ifsoftc *igi) 3368 { 3369 struct ifmultiaddr *ifma; 3370 struct ifnet *ifp; 3371 struct in_multi *inm; 3372 int retval, loop; 3373 3374 IN_MULTI_LOCK_ASSERT(); 3375 IGMP_LOCK_ASSERT(); 3376 3377 KASSERT(igi->igi_version == IGMP_VERSION_3, 3378 ("%s: called when version %d", __func__, igi->igi_version)); 3379 3380 /* 3381 * Check that there are some packets queued. If so, send them first. 3382 * For large number of groups the reply to general query can take 3383 * many packets, we should finish sending them before starting of 3384 * queuing the new reply. 3385 */ 3386 if (mbufq_len(&igi->igi_gq) != 0) 3387 goto send; 3388 3389 ifp = igi->igi_ifp; 3390 3391 IF_ADDR_RLOCK(ifp); 3392 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3393 if (ifma->ifma_addr->sa_family != AF_INET || 3394 ifma->ifma_protospec == NULL) 3395 continue; 3396 3397 inm = (struct in_multi *)ifma->ifma_protospec; 3398 KASSERT(ifp == inm->inm_ifp, 3399 ("%s: inconsistent ifp", __func__)); 3400 3401 switch (inm->inm_state) { 3402 case IGMP_NOT_MEMBER: 3403 case IGMP_SILENT_MEMBER: 3404 break; 3405 case IGMP_REPORTING_MEMBER: 3406 case IGMP_IDLE_MEMBER: 3407 case IGMP_LAZY_MEMBER: 3408 case IGMP_SLEEPING_MEMBER: 3409 case IGMP_AWAKENING_MEMBER: 3410 inm->inm_state = IGMP_REPORTING_MEMBER; 3411 retval = igmp_v3_enqueue_group_record(&igi->igi_gq, 3412 inm, 0, 0, 0); 3413 CTR2(KTR_IGMPV3, "%s: enqueue record = %d", 3414 __func__, retval); 3415 break; 3416 case IGMP_G_QUERY_PENDING_MEMBER: 3417 case IGMP_SG_QUERY_PENDING_MEMBER: 3418 case IGMP_LEAVING_MEMBER: 3419 break; 3420 } 3421 } 3422 IF_ADDR_RUNLOCK(ifp); 3423 3424 send: 3425 loop = (igi->igi_flags & IGIF_LOOPBACK) ? 1 : 0; 3426 igmp_dispatch_queue(&igi->igi_gq, IGMP_MAX_RESPONSE_BURST, loop); 3427 3428 /* 3429 * Slew transmission of bursts over 500ms intervals. 3430 */ 3431 if (mbufq_first(&igi->igi_gq) != NULL) { 3432 igi->igi_v3_timer = 1 + IGMP_RANDOM_DELAY( 3433 IGMP_RESPONSE_BURST_INTERVAL); 3434 V_interface_timers_running = 1; 3435 } 3436 } 3437 3438 /* 3439 * Transmit the next pending IGMP message in the output queue. 3440 * 3441 * We get called from netisr_processqueue(). A mutex private to igmpoq 3442 * will be acquired and released around this routine. 3443 * 3444 * VIMAGE: Needs to store/restore vnet pointer on a per-mbuf-chain basis. 3445 * MRT: Nothing needs to be done, as IGMP traffic is always local to 3446 * a link and uses a link-scope multicast address. 3447 */ 3448 static void 3449 igmp_intr(struct mbuf *m) 3450 { 3451 struct ip_moptions imo; 3452 struct ifnet *ifp; 3453 struct mbuf *ipopts, *m0; 3454 int error; 3455 uint32_t ifindex; 3456 3457 CTR2(KTR_IGMPV3, "%s: transmit %p", __func__, m); 3458 3459 /* 3460 * Set VNET image pointer from enqueued mbuf chain 3461 * before doing anything else. Whilst we use interface 3462 * indexes to guard against interface detach, they are 3463 * unique to each VIMAGE and must be retrieved. 3464 */ 3465 CURVNET_SET((struct vnet *)(m->m_pkthdr.PH_loc.ptr)); 3466 ifindex = igmp_restore_context(m); 3467 3468 /* 3469 * Check if the ifnet still exists. This limits the scope of 3470 * any race in the absence of a global ifp lock for low cost 3471 * (an array lookup). 3472 */ 3473 ifp = ifnet_byindex(ifindex); 3474 if (ifp == NULL) { 3475 CTR3(KTR_IGMPV3, "%s: dropped %p as ifindex %u went away.", 3476 __func__, m, ifindex); 3477 m_freem(m); 3478 IPSTAT_INC(ips_noroute); 3479 goto out; 3480 } 3481 3482 ipopts = V_igmp_sendra ? m_raopt : NULL; 3483 3484 imo.imo_multicast_ttl = 1; 3485 imo.imo_multicast_vif = -1; 3486 imo.imo_multicast_loop = (V_ip_mrouter != NULL); 3487 3488 /* 3489 * If the user requested that IGMP traffic be explicitly 3490 * redirected to the loopback interface (e.g. they are running a 3491 * MANET interface and the routing protocol needs to see the 3492 * updates), handle this now. 3493 */ 3494 if (m->m_flags & M_IGMP_LOOP) 3495 imo.imo_multicast_ifp = V_loif; 3496 else 3497 imo.imo_multicast_ifp = ifp; 3498 3499 if (m->m_flags & M_IGMPV2) { 3500 m0 = m; 3501 } else { 3502 m0 = igmp_v3_encap_report(ifp, m); 3503 if (m0 == NULL) { 3504 CTR2(KTR_IGMPV3, "%s: dropped %p", __func__, m); 3505 m_freem(m); 3506 IPSTAT_INC(ips_odropped); 3507 goto out; 3508 } 3509 } 3510 3511 igmp_scrub_context(m0); 3512 m_clrprotoflags(m); 3513 m0->m_pkthdr.rcvif = V_loif; 3514 #ifdef MAC 3515 mac_netinet_igmp_send(ifp, m0); 3516 #endif 3517 error = ip_output(m0, ipopts, NULL, 0, &imo, NULL); 3518 if (error) { 3519 CTR3(KTR_IGMPV3, "%s: ip_output(%p) = %d", __func__, m0, error); 3520 goto out; 3521 } 3522 3523 IGMPSTAT_INC(igps_snd_reports); 3524 3525 out: 3526 /* 3527 * We must restore the existing vnet pointer before 3528 * continuing as we are run from netisr context. 3529 */ 3530 CURVNET_RESTORE(); 3531 } 3532 3533 /* 3534 * Encapsulate an IGMPv3 report. 3535 * 3536 * The internal mbuf flag M_IGMPV3_HDR is used to indicate that the mbuf 3537 * chain has already had its IP/IGMPv3 header prepended. In this case 3538 * the function will not attempt to prepend; the lengths and checksums 3539 * will however be re-computed. 3540 * 3541 * Returns a pointer to the new mbuf chain head, or NULL if the 3542 * allocation failed. 3543 */ 3544 static struct mbuf * 3545 igmp_v3_encap_report(struct ifnet *ifp, struct mbuf *m) 3546 { 3547 struct rm_priotracker in_ifa_tracker; 3548 struct igmp_report *igmp; 3549 struct ip *ip; 3550 int hdrlen, igmpreclen; 3551 3552 KASSERT((m->m_flags & M_PKTHDR), 3553 ("%s: mbuf chain %p is !M_PKTHDR", __func__, m)); 3554 3555 igmpreclen = m_length(m, NULL); 3556 hdrlen = sizeof(struct ip) + sizeof(struct igmp_report); 3557 3558 if (m->m_flags & M_IGMPV3_HDR) { 3559 igmpreclen -= hdrlen; 3560 } else { 3561 M_PREPEND(m, hdrlen, M_NOWAIT); 3562 if (m == NULL) 3563 return (NULL); 3564 m->m_flags |= M_IGMPV3_HDR; 3565 } 3566 3567 CTR2(KTR_IGMPV3, "%s: igmpreclen is %d", __func__, igmpreclen); 3568 3569 m->m_data += sizeof(struct ip); 3570 m->m_len -= sizeof(struct ip); 3571 3572 igmp = mtod(m, struct igmp_report *); 3573 igmp->ir_type = IGMP_v3_HOST_MEMBERSHIP_REPORT; 3574 igmp->ir_rsv1 = 0; 3575 igmp->ir_rsv2 = 0; 3576 igmp->ir_numgrps = htons(m->m_pkthdr.PH_vt.vt_nrecs); 3577 igmp->ir_cksum = 0; 3578 igmp->ir_cksum = in_cksum(m, sizeof(struct igmp_report) + igmpreclen); 3579 m->m_pkthdr.PH_vt.vt_nrecs = 0; 3580 3581 m->m_data -= sizeof(struct ip); 3582 m->m_len += sizeof(struct ip); 3583 3584 ip = mtod(m, struct ip *); 3585 ip->ip_tos = IPTOS_PREC_INTERNETCONTROL; 3586 ip->ip_len = htons(hdrlen + igmpreclen); 3587 ip->ip_off = htons(IP_DF); 3588 ip->ip_p = IPPROTO_IGMP; 3589 ip->ip_sum = 0; 3590 3591 ip->ip_src.s_addr = INADDR_ANY; 3592 3593 if (m->m_flags & M_IGMP_LOOP) { 3594 struct in_ifaddr *ia; 3595 3596 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 3597 if (ia != NULL) { 3598 ip->ip_src = ia->ia_addr.sin_addr; 3599 ifa_free(&ia->ia_ifa); 3600 } 3601 } 3602 3603 ip->ip_dst.s_addr = htonl(INADDR_ALLRPTS_GROUP); 3604 3605 return (m); 3606 } 3607 3608 #ifdef KTR 3609 static char * 3610 igmp_rec_type_to_str(const int type) 3611 { 3612 3613 switch (type) { 3614 case IGMP_CHANGE_TO_EXCLUDE_MODE: 3615 return "TO_EX"; 3616 break; 3617 case IGMP_CHANGE_TO_INCLUDE_MODE: 3618 return "TO_IN"; 3619 break; 3620 case IGMP_MODE_IS_EXCLUDE: 3621 return "MODE_EX"; 3622 break; 3623 case IGMP_MODE_IS_INCLUDE: 3624 return "MODE_IN"; 3625 break; 3626 case IGMP_ALLOW_NEW_SOURCES: 3627 return "ALLOW_NEW"; 3628 break; 3629 case IGMP_BLOCK_OLD_SOURCES: 3630 return "BLOCK_OLD"; 3631 break; 3632 default: 3633 break; 3634 } 3635 return "unknown"; 3636 } 3637 #endif 3638 3639 #ifdef VIMAGE 3640 static void 3641 vnet_igmp_init(const void *unused __unused) 3642 { 3643 3644 netisr_register_vnet(&igmp_nh); 3645 } 3646 VNET_SYSINIT(vnet_igmp_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3647 vnet_igmp_init, NULL); 3648 3649 static void 3650 vnet_igmp_uninit(const void *unused __unused) 3651 { 3652 3653 /* This can happen when we shutdown the entire network stack. */ 3654 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3655 3656 netisr_unregister_vnet(&igmp_nh); 3657 } 3658 VNET_SYSUNINIT(vnet_igmp_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, 3659 vnet_igmp_uninit, NULL); 3660 #endif 3661 3662 #ifdef DDB 3663 DB_SHOW_COMMAND(igi_list, db_show_igi_list) 3664 { 3665 struct igmp_ifsoftc *igi, *tigi; 3666 LIST_HEAD(_igi_list, igmp_ifsoftc) *igi_head; 3667 3668 if (!have_addr) { 3669 db_printf("usage: show igi_list <addr>\n"); 3670 return; 3671 } 3672 igi_head = (struct _igi_list *)addr; 3673 3674 LIST_FOREACH_SAFE(igi, igi_head, igi_link, tigi) { 3675 db_printf("igmp_ifsoftc %p:\n", igi); 3676 db_printf(" ifp %p\n", igi->igi_ifp); 3677 db_printf(" version %u\n", igi->igi_version); 3678 db_printf(" v1_timer %u\n", igi->igi_v1_timer); 3679 db_printf(" v2_timer %u\n", igi->igi_v2_timer); 3680 db_printf(" v3_timer %u\n", igi->igi_v3_timer); 3681 db_printf(" flags %#x\n", igi->igi_flags); 3682 db_printf(" rv %u\n", igi->igi_rv); 3683 db_printf(" qi %u\n", igi->igi_qi); 3684 db_printf(" qri %u\n", igi->igi_qri); 3685 db_printf(" uri %u\n", igi->igi_uri); 3686 /* SLIST_HEAD(,in_multi) igi_relinmhead */ 3687 /* struct mbufq igi_gq; */ 3688 db_printf("\n"); 3689 } 3690 } 3691 #endif 3692 3693 static int 3694 igmp_modevent(module_t mod, int type, void *unused __unused) 3695 { 3696 3697 switch (type) { 3698 case MOD_LOAD: 3699 CTR1(KTR_IGMPV3, "%s: initializing", __func__); 3700 IGMP_LOCK_INIT(); 3701 m_raopt = igmp_ra_alloc(); 3702 netisr_register(&igmp_nh); 3703 break; 3704 case MOD_UNLOAD: 3705 CTR1(KTR_IGMPV3, "%s: tearing down", __func__); 3706 netisr_unregister(&igmp_nh); 3707 m_free(m_raopt); 3708 m_raopt = NULL; 3709 IGMP_LOCK_DESTROY(); 3710 break; 3711 default: 3712 return (EOPNOTSUPP); 3713 } 3714 return (0); 3715 } 3716 3717 static moduledata_t igmp_mod = { 3718 "igmp", 3719 igmp_modevent, 3720 0 3721 }; 3722 DECLARE_MODULE(igmp, igmp_mod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE); 3723