| 1 | /* $NetBSD: igmp.c,v 1.62 2016/08/01 03:15:30 ozaki-r Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the project nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * Internet Group Management Protocol (IGMP) routines. |
| 34 | * |
| 35 | * Written by Steve Deering, Stanford, May 1988. |
| 36 | * Modified by Rosen Sharma, Stanford, Aug 1994. |
| 37 | * Modified by Bill Fenner, Xerox PARC, Feb 1995. |
| 38 | * |
| 39 | * MULTICAST Revision: 1.3 |
| 40 | */ |
| 41 | |
| 42 | #include <sys/cdefs.h> |
| 43 | __KERNEL_RCSID(0, "$NetBSD: igmp.c,v 1.62 2016/08/01 03:15:30 ozaki-r Exp $" ); |
| 44 | |
| 45 | #ifdef _KERNEL_OPT |
| 46 | #include "opt_mrouting.h" |
| 47 | #endif |
| 48 | |
| 49 | #include <sys/param.h> |
| 50 | #include <sys/mbuf.h> |
| 51 | #include <sys/socket.h> |
| 52 | #include <sys/socketvar.h> |
| 53 | #include <sys/protosw.h> |
| 54 | #include <sys/systm.h> |
| 55 | #include <sys/cprng.h> |
| 56 | #include <sys/sysctl.h> |
| 57 | |
| 58 | #include <net/if.h> |
| 59 | #include <net/net_stats.h> |
| 60 | |
| 61 | #include <netinet/in.h> |
| 62 | #include <netinet/in_var.h> |
| 63 | #include <netinet/in_systm.h> |
| 64 | #include <netinet/ip.h> |
| 65 | #include <netinet/ip_var.h> |
| 66 | #include <netinet/igmp.h> |
| 67 | #include <netinet/igmp_var.h> |
| 68 | |
| 69 | /* |
| 70 | * Per-interface router version information. |
| 71 | */ |
| 72 | typedef struct router_info { |
| 73 | LIST_ENTRY(router_info) rti_link; |
| 74 | ifnet_t * rti_ifp; |
| 75 | int rti_type; /* type of router on this interface */ |
| 76 | int rti_age; /* time since last v1 query */ |
| 77 | } router_info_t; |
| 78 | |
| 79 | /* |
| 80 | * The router-info list and the timer flag are protected by in_multilock. |
| 81 | * |
| 82 | * Lock order: |
| 83 | * |
| 84 | * softnet_lock -> |
| 85 | * in_multilock |
| 86 | */ |
| 87 | static struct pool igmp_rti_pool __cacheline_aligned; |
| 88 | static LIST_HEAD(, router_info) rti_head __cacheline_aligned; |
| 89 | static int igmp_timers_on __cacheline_aligned; |
| 90 | static percpu_t * igmpstat_percpu __read_mostly; |
| 91 | |
| 92 | #define IGMP_STATINC(x) _NET_STATINC(igmpstat_percpu, x) |
| 93 | |
| 94 | static void igmp_sendpkt(struct in_multi *, int); |
| 95 | static int rti_fill(struct in_multi *); |
| 96 | static router_info_t * rti_find(struct ifnet *); |
| 97 | static void rti_delete(struct ifnet *); |
| 98 | static void sysctl_net_inet_igmp_setup(struct sysctllog **); |
| 99 | |
| 100 | /* |
| 101 | * rti_fill: associate router information with the given multicast group; |
| 102 | * if there is no router information for the interface, then create it. |
| 103 | */ |
| 104 | static int |
| 105 | rti_fill(struct in_multi *inm) |
| 106 | { |
| 107 | router_info_t *rti; |
| 108 | |
| 109 | KASSERT(in_multi_lock_held()); |
| 110 | |
| 111 | LIST_FOREACH(rti, &rti_head, rti_link) { |
| 112 | if (rti->rti_ifp == inm->inm_ifp) { |
| 113 | inm->inm_rti = rti; |
| 114 | return rti->rti_type == IGMP_v1_ROUTER ? |
| 115 | IGMP_v1_HOST_MEMBERSHIP_REPORT : |
| 116 | IGMP_v2_HOST_MEMBERSHIP_REPORT; |
| 117 | } |
| 118 | } |
| 119 | rti = pool_get(&igmp_rti_pool, PR_NOWAIT); |
| 120 | if (rti == NULL) { |
| 121 | return 0; |
| 122 | } |
| 123 | rti->rti_ifp = inm->inm_ifp; |
| 124 | rti->rti_type = IGMP_v2_ROUTER; |
| 125 | LIST_INSERT_HEAD(&rti_head, rti, rti_link); |
| 126 | inm->inm_rti = rti; |
| 127 | return IGMP_v2_HOST_MEMBERSHIP_REPORT; |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * rti_find: lookup or create router information for the given interface. |
| 132 | */ |
| 133 | static router_info_t * |
| 134 | rti_find(ifnet_t *ifp) |
| 135 | { |
| 136 | router_info_t *rti; |
| 137 | |
| 138 | KASSERT(in_multi_lock_held()); |
| 139 | |
| 140 | LIST_FOREACH(rti, &rti_head, rti_link) { |
| 141 | if (rti->rti_ifp == ifp) |
| 142 | return rti; |
| 143 | } |
| 144 | rti = pool_get(&igmp_rti_pool, PR_NOWAIT); |
| 145 | if (rti == NULL) { |
| 146 | return NULL; |
| 147 | } |
| 148 | rti->rti_ifp = ifp; |
| 149 | rti->rti_type = IGMP_v2_ROUTER; |
| 150 | LIST_INSERT_HEAD(&rti_head, rti, rti_link); |
| 151 | return rti; |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * rti_delete: remove and free the router information entry for the |
| 156 | * given interface. |
| 157 | */ |
| 158 | static void |
| 159 | rti_delete(ifnet_t *ifp) |
| 160 | { |
| 161 | router_info_t *rti; |
| 162 | |
| 163 | KASSERT(in_multi_lock_held()); |
| 164 | |
| 165 | LIST_FOREACH(rti, &rti_head, rti_link) { |
| 166 | if (rti->rti_ifp == ifp) { |
| 167 | LIST_REMOVE(rti, rti_link); |
| 168 | pool_put(&igmp_rti_pool, rti); |
| 169 | break; |
| 170 | } |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | void |
| 175 | igmp_init(void) |
| 176 | { |
| 177 | pool_init(&igmp_rti_pool, sizeof(router_info_t), 0, 0, 0, |
| 178 | "igmppl" , NULL, IPL_SOFTNET); |
| 179 | igmpstat_percpu = percpu_alloc(sizeof(uint64_t) * IGMP_NSTATS); |
| 180 | sysctl_net_inet_igmp_setup(NULL); |
| 181 | LIST_INIT(&rti_head); |
| 182 | } |
| 183 | |
| 184 | void |
| 185 | igmp_input(struct mbuf *m, ...) |
| 186 | { |
| 187 | ifnet_t *ifp; |
| 188 | struct ip *ip = mtod(m, struct ip *); |
| 189 | struct igmp *igmp; |
| 190 | u_int minlen, timer; |
| 191 | struct in_multi *inm; |
| 192 | struct in_ifaddr *ia; |
| 193 | int proto, ip_len, iphlen; |
| 194 | va_list ap; |
| 195 | struct psref psref; |
| 196 | |
| 197 | va_start(ap, m); |
| 198 | iphlen = va_arg(ap, int); |
| 199 | proto = va_arg(ap, int); |
| 200 | va_end(ap); |
| 201 | |
| 202 | IGMP_STATINC(IGMP_STAT_RCV_TOTAL); |
| 203 | |
| 204 | /* |
| 205 | * Validate lengths |
| 206 | */ |
| 207 | minlen = iphlen + IGMP_MINLEN; |
| 208 | ip_len = ntohs(ip->ip_len); |
| 209 | if (ip_len < minlen) { |
| 210 | IGMP_STATINC(IGMP_STAT_RCV_TOOSHORT); |
| 211 | m_freem(m); |
| 212 | return; |
| 213 | } |
| 214 | if (((m->m_flags & M_EXT) && (ip->ip_src.s_addr & IN_CLASSA_NET) == 0) |
| 215 | || m->m_len < minlen) { |
| 216 | if ((m = m_pullup(m, minlen)) == NULL) { |
| 217 | IGMP_STATINC(IGMP_STAT_RCV_TOOSHORT); |
| 218 | return; |
| 219 | } |
| 220 | ip = mtod(m, struct ip *); |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * Validate checksum |
| 225 | */ |
| 226 | m->m_data += iphlen; |
| 227 | m->m_len -= iphlen; |
| 228 | igmp = mtod(m, struct igmp *); |
| 229 | /* No need to assert alignment here. */ |
| 230 | if (in_cksum(m, ip_len - iphlen)) { |
| 231 | IGMP_STATINC(IGMP_STAT_RCV_BADSUM); |
| 232 | m_freem(m); |
| 233 | return; |
| 234 | } |
| 235 | m->m_data -= iphlen; |
| 236 | m->m_len += iphlen; |
| 237 | |
| 238 | ifp = m_get_rcvif_psref(m, &psref); |
| 239 | if (__predict_false(ifp == NULL)) |
| 240 | goto drop; |
| 241 | |
| 242 | switch (igmp->igmp_type) { |
| 243 | |
| 244 | case IGMP_HOST_MEMBERSHIP_QUERY: |
| 245 | IGMP_STATINC(IGMP_STAT_RCV_QUERIES); |
| 246 | |
| 247 | if (ifp->if_flags & IFF_LOOPBACK) |
| 248 | break; |
| 249 | |
| 250 | if (igmp->igmp_code == 0) { |
| 251 | struct in_multistep step; |
| 252 | router_info_t *rti; |
| 253 | |
| 254 | if (ip->ip_dst.s_addr != INADDR_ALLHOSTS_GROUP) { |
| 255 | IGMP_STATINC(IGMP_STAT_RCV_BADQUERIES); |
| 256 | goto drop; |
| 257 | } |
| 258 | |
| 259 | in_multi_lock(RW_WRITER); |
| 260 | rti = rti_find(ifp); |
| 261 | if (rti == NULL) { |
| 262 | in_multi_unlock(); |
| 263 | break; |
| 264 | } |
| 265 | rti->rti_type = IGMP_v1_ROUTER; |
| 266 | rti->rti_age = 0; |
| 267 | |
| 268 | /* |
| 269 | * Start the timers in all of our membership records |
| 270 | * for the interface on which the query arrived, |
| 271 | * except those that are already running and those |
| 272 | * that belong to a "local" group (224.0.0.X). |
| 273 | */ |
| 274 | |
| 275 | inm = in_first_multi(&step); |
| 276 | while (inm != NULL) { |
| 277 | if (inm->inm_ifp == ifp && |
| 278 | inm->inm_timer == 0 && |
| 279 | !IN_LOCAL_GROUP(inm->inm_addr.s_addr)) { |
| 280 | inm->inm_state = IGMP_DELAYING_MEMBER; |
| 281 | inm->inm_timer = IGMP_RANDOM_DELAY( |
| 282 | IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ); |
| 283 | igmp_timers_on = true; |
| 284 | } |
| 285 | inm = in_next_multi(&step); |
| 286 | } |
| 287 | in_multi_unlock(); |
| 288 | } else { |
| 289 | struct in_multistep step; |
| 290 | |
| 291 | if (!IN_MULTICAST(ip->ip_dst.s_addr)) { |
| 292 | IGMP_STATINC(IGMP_STAT_RCV_BADQUERIES); |
| 293 | goto drop; |
| 294 | } |
| 295 | |
| 296 | timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE; |
| 297 | if (timer == 0) |
| 298 | timer = 1; |
| 299 | |
| 300 | /* |
| 301 | * Start the timers in all of our membership records |
| 302 | * for the interface on which the query arrived, |
| 303 | * except those that are already running and those |
| 304 | * that belong to a "local" group (224.0.0.X). For |
| 305 | * timers already running, check if they need to be |
| 306 | * reset. |
| 307 | */ |
| 308 | in_multi_lock(RW_WRITER); |
| 309 | inm = in_first_multi(&step); |
| 310 | while (inm != NULL) { |
| 311 | if (inm->inm_ifp == ifp && |
| 312 | !IN_LOCAL_GROUP(inm->inm_addr.s_addr) && |
| 313 | (ip->ip_dst.s_addr == INADDR_ALLHOSTS_GROUP || |
| 314 | in_hosteq(ip->ip_dst, inm->inm_addr))) { |
| 315 | switch (inm->inm_state) { |
| 316 | case IGMP_DELAYING_MEMBER: |
| 317 | if (inm->inm_timer <= timer) |
| 318 | break; |
| 319 | /* FALLTHROUGH */ |
| 320 | case IGMP_IDLE_MEMBER: |
| 321 | case IGMP_LAZY_MEMBER: |
| 322 | case IGMP_AWAKENING_MEMBER: |
| 323 | inm->inm_state = |
| 324 | IGMP_DELAYING_MEMBER; |
| 325 | inm->inm_timer = |
| 326 | IGMP_RANDOM_DELAY(timer); |
| 327 | igmp_timers_on = true; |
| 328 | break; |
| 329 | case IGMP_SLEEPING_MEMBER: |
| 330 | inm->inm_state = |
| 331 | IGMP_AWAKENING_MEMBER; |
| 332 | break; |
| 333 | } |
| 334 | } |
| 335 | inm = in_next_multi(&step); |
| 336 | } |
| 337 | in_multi_unlock(); |
| 338 | } |
| 339 | |
| 340 | break; |
| 341 | |
| 342 | case IGMP_v1_HOST_MEMBERSHIP_REPORT: |
| 343 | IGMP_STATINC(IGMP_STAT_RCV_REPORTS); |
| 344 | |
| 345 | if (ifp->if_flags & IFF_LOOPBACK) |
| 346 | break; |
| 347 | |
| 348 | if (!IN_MULTICAST(igmp->igmp_group.s_addr) || |
| 349 | !in_hosteq(igmp->igmp_group, ip->ip_dst)) { |
| 350 | IGMP_STATINC(IGMP_STAT_RCV_BADREPORTS); |
| 351 | goto drop; |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * KLUDGE: if the IP source address of the report has an |
| 356 | * unspecified (i.e., zero) subnet number, as is allowed for |
| 357 | * a booting host, replace it with the correct subnet number |
| 358 | * so that a process-level multicast routing daemon can |
| 359 | * determine which subnet it arrived from. This is necessary |
| 360 | * to compensate for the lack of any way for a process to |
| 361 | * determine the arrival interface of an incoming packet. |
| 362 | */ |
| 363 | if ((ip->ip_src.s_addr & IN_CLASSA_NET) == 0) { |
| 364 | int s = pserialize_read_enter(); |
| 365 | ia = in_get_ia_from_ifp(ifp); /* XXX */ |
| 366 | if (ia) |
| 367 | ip->ip_src.s_addr = ia->ia_subnet; |
| 368 | pserialize_read_exit(s); |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * If we belong to the group being reported, stop |
| 373 | * our timer for that group. |
| 374 | */ |
| 375 | in_multi_lock(RW_WRITER); |
| 376 | inm = in_lookup_multi(igmp->igmp_group, ifp); |
| 377 | if (inm != NULL) { |
| 378 | inm->inm_timer = 0; |
| 379 | IGMP_STATINC(IGMP_STAT_RCV_OURREPORTS); |
| 380 | |
| 381 | switch (inm->inm_state) { |
| 382 | case IGMP_IDLE_MEMBER: |
| 383 | case IGMP_LAZY_MEMBER: |
| 384 | case IGMP_AWAKENING_MEMBER: |
| 385 | case IGMP_SLEEPING_MEMBER: |
| 386 | inm->inm_state = IGMP_SLEEPING_MEMBER; |
| 387 | break; |
| 388 | case IGMP_DELAYING_MEMBER: |
| 389 | if (inm->inm_rti->rti_type == IGMP_v1_ROUTER) |
| 390 | inm->inm_state = IGMP_LAZY_MEMBER; |
| 391 | else |
| 392 | inm->inm_state = IGMP_SLEEPING_MEMBER; |
| 393 | break; |
| 394 | } |
| 395 | } |
| 396 | in_multi_unlock(); |
| 397 | break; |
| 398 | |
| 399 | case IGMP_v2_HOST_MEMBERSHIP_REPORT: { |
| 400 | int s = pserialize_read_enter(); |
| 401 | #ifdef MROUTING |
| 402 | /* |
| 403 | * Make sure we don't hear our own membership report. Fast |
| 404 | * leave requires knowing that we are the only member of a |
| 405 | * group. |
| 406 | */ |
| 407 | ia = in_get_ia_from_ifp(ifp); /* XXX */ |
| 408 | if (ia && in_hosteq(ip->ip_src, ia->ia_addr.sin_addr)) { |
| 409 | pserialize_read_exit(s); |
| 410 | break; |
| 411 | } |
| 412 | #endif |
| 413 | |
| 414 | IGMP_STATINC(IGMP_STAT_RCV_REPORTS); |
| 415 | |
| 416 | if (ifp->if_flags & IFF_LOOPBACK) { |
| 417 | pserialize_read_exit(s); |
| 418 | break; |
| 419 | } |
| 420 | |
| 421 | if (!IN_MULTICAST(igmp->igmp_group.s_addr) || |
| 422 | !in_hosteq(igmp->igmp_group, ip->ip_dst)) { |
| 423 | IGMP_STATINC(IGMP_STAT_RCV_BADREPORTS); |
| 424 | pserialize_read_exit(s); |
| 425 | goto drop; |
| 426 | } |
| 427 | |
| 428 | /* |
| 429 | * KLUDGE: if the IP source address of the report has an |
| 430 | * unspecified (i.e., zero) subnet number, as is allowed for |
| 431 | * a booting host, replace it with the correct subnet number |
| 432 | * so that a process-level multicast routing daemon can |
| 433 | * determine which subnet it arrived from. This is necessary |
| 434 | * to compensate for the lack of any way for a process to |
| 435 | * determine the arrival interface of an incoming packet. |
| 436 | */ |
| 437 | if ((ip->ip_src.s_addr & IN_CLASSA_NET) == 0) { |
| 438 | #ifndef MROUTING |
| 439 | ia = in_get_ia_from_ifp(ifp); /* XXX */ |
| 440 | #endif |
| 441 | if (ia) |
| 442 | ip->ip_src.s_addr = ia->ia_subnet; |
| 443 | } |
| 444 | pserialize_read_exit(s); |
| 445 | |
| 446 | /* |
| 447 | * If we belong to the group being reported, stop |
| 448 | * our timer for that group. |
| 449 | */ |
| 450 | in_multi_lock(RW_WRITER); |
| 451 | inm = in_lookup_multi(igmp->igmp_group, ifp); |
| 452 | if (inm != NULL) { |
| 453 | inm->inm_timer = 0; |
| 454 | IGMP_STATINC(IGMP_STAT_RCV_OURREPORTS); |
| 455 | |
| 456 | switch (inm->inm_state) { |
| 457 | case IGMP_DELAYING_MEMBER: |
| 458 | case IGMP_IDLE_MEMBER: |
| 459 | case IGMP_AWAKENING_MEMBER: |
| 460 | inm->inm_state = IGMP_LAZY_MEMBER; |
| 461 | break; |
| 462 | case IGMP_LAZY_MEMBER: |
| 463 | case IGMP_SLEEPING_MEMBER: |
| 464 | break; |
| 465 | } |
| 466 | } |
| 467 | in_multi_unlock(); |
| 468 | break; |
| 469 | } |
| 470 | } |
| 471 | m_put_rcvif_psref(ifp, &psref); |
| 472 | |
| 473 | /* |
| 474 | * Pass all valid IGMP packets up to any process(es) listening |
| 475 | * on a raw IGMP socket. |
| 476 | */ |
| 477 | rip_input(m, iphlen, proto); |
| 478 | return; |
| 479 | |
| 480 | drop: |
| 481 | m_put_rcvif_psref(ifp, &psref); |
| 482 | m_freem(m); |
| 483 | return; |
| 484 | } |
| 485 | |
| 486 | int |
| 487 | igmp_joingroup(struct in_multi *inm) |
| 488 | { |
| 489 | KASSERT(in_multi_lock_held()); |
| 490 | inm->inm_state = IGMP_IDLE_MEMBER; |
| 491 | |
| 492 | if (!IN_LOCAL_GROUP(inm->inm_addr.s_addr) && |
| 493 | (inm->inm_ifp->if_flags & IFF_LOOPBACK) == 0) { |
| 494 | int report_type; |
| 495 | |
| 496 | report_type = rti_fill(inm); |
| 497 | if (report_type == 0) { |
| 498 | return ENOMEM; |
| 499 | } |
| 500 | igmp_sendpkt(inm, report_type); |
| 501 | inm->inm_state = IGMP_DELAYING_MEMBER; |
| 502 | inm->inm_timer = IGMP_RANDOM_DELAY( |
| 503 | IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ); |
| 504 | igmp_timers_on = true; |
| 505 | } else |
| 506 | inm->inm_timer = 0; |
| 507 | |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | void |
| 512 | igmp_leavegroup(struct in_multi *inm) |
| 513 | { |
| 514 | KASSERT(in_multi_lock_held()); |
| 515 | |
| 516 | switch (inm->inm_state) { |
| 517 | case IGMP_DELAYING_MEMBER: |
| 518 | case IGMP_IDLE_MEMBER: |
| 519 | if (!IN_LOCAL_GROUP(inm->inm_addr.s_addr) && |
| 520 | (inm->inm_ifp->if_flags & IFF_LOOPBACK) == 0) |
| 521 | if (inm->inm_rti->rti_type != IGMP_v1_ROUTER) |
| 522 | igmp_sendpkt(inm, IGMP_HOST_LEAVE_MESSAGE); |
| 523 | break; |
| 524 | case IGMP_LAZY_MEMBER: |
| 525 | case IGMP_AWAKENING_MEMBER: |
| 526 | case IGMP_SLEEPING_MEMBER: |
| 527 | break; |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | void |
| 532 | igmp_fasttimo(void) |
| 533 | { |
| 534 | struct in_multi *inm; |
| 535 | struct in_multistep step; |
| 536 | |
| 537 | /* |
| 538 | * Quick check to see if any work needs to be done, in order |
| 539 | * to minimize the overhead of fasttimo processing. |
| 540 | */ |
| 541 | if (!igmp_timers_on) { |
| 542 | return; |
| 543 | } |
| 544 | |
| 545 | /* XXX: Needed for ip_output(). */ |
| 546 | mutex_enter(softnet_lock); |
| 547 | |
| 548 | in_multi_lock(RW_WRITER); |
| 549 | igmp_timers_on = false; |
| 550 | inm = in_first_multi(&step); |
| 551 | while (inm != NULL) { |
| 552 | if (inm->inm_timer == 0) { |
| 553 | /* do nothing */ |
| 554 | } else if (--inm->inm_timer == 0) { |
| 555 | if (inm->inm_state == IGMP_DELAYING_MEMBER) { |
| 556 | if (inm->inm_rti->rti_type == IGMP_v1_ROUTER) |
| 557 | igmp_sendpkt(inm, |
| 558 | IGMP_v1_HOST_MEMBERSHIP_REPORT); |
| 559 | else |
| 560 | igmp_sendpkt(inm, |
| 561 | IGMP_v2_HOST_MEMBERSHIP_REPORT); |
| 562 | inm->inm_state = IGMP_IDLE_MEMBER; |
| 563 | } |
| 564 | } else { |
| 565 | igmp_timers_on = true; |
| 566 | } |
| 567 | inm = in_next_multi(&step); |
| 568 | } |
| 569 | in_multi_unlock(); |
| 570 | mutex_exit(softnet_lock); |
| 571 | } |
| 572 | |
| 573 | void |
| 574 | igmp_slowtimo(void) |
| 575 | { |
| 576 | router_info_t *rti; |
| 577 | |
| 578 | in_multi_lock(RW_WRITER); |
| 579 | LIST_FOREACH(rti, &rti_head, rti_link) { |
| 580 | if (rti->rti_type == IGMP_v1_ROUTER && |
| 581 | ++rti->rti_age >= IGMP_AGE_THRESHOLD) { |
| 582 | rti->rti_type = IGMP_v2_ROUTER; |
| 583 | } |
| 584 | } |
| 585 | in_multi_unlock(); |
| 586 | } |
| 587 | |
| 588 | /* |
| 589 | * igmp_sendpkt: construct an IGMP packet, given the multicast structure |
| 590 | * and the type, and send the datagram. |
| 591 | */ |
| 592 | static void |
| 593 | igmp_sendpkt(struct in_multi *inm, int type) |
| 594 | { |
| 595 | struct mbuf *m; |
| 596 | struct igmp *igmp; |
| 597 | struct ip *ip; |
| 598 | struct ip_moptions imo; |
| 599 | |
| 600 | KASSERT(in_multi_lock_held()); |
| 601 | |
| 602 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
| 603 | if (m == NULL) |
| 604 | return; |
| 605 | |
| 606 | /* |
| 607 | * Assume max_linkhdr + sizeof(struct ip) + IGMP_MINLEN |
| 608 | * is smaller than mbuf size returned by MGETHDR. |
| 609 | */ |
| 610 | m->m_data += max_linkhdr; |
| 611 | m->m_len = sizeof(struct ip) + IGMP_MINLEN; |
| 612 | m->m_pkthdr.len = sizeof(struct ip) + IGMP_MINLEN; |
| 613 | |
| 614 | ip = mtod(m, struct ip *); |
| 615 | ip->ip_tos = 0; |
| 616 | ip->ip_len = htons(sizeof(struct ip) + IGMP_MINLEN); |
| 617 | ip->ip_off = htons(0); |
| 618 | ip->ip_p = IPPROTO_IGMP; |
| 619 | ip->ip_src = zeroin_addr; |
| 620 | ip->ip_dst = inm->inm_addr; |
| 621 | |
| 622 | m->m_data += sizeof(struct ip); |
| 623 | m->m_len -= sizeof(struct ip); |
| 624 | igmp = mtod(m, struct igmp *); |
| 625 | igmp->igmp_type = type; |
| 626 | igmp->igmp_code = 0; |
| 627 | igmp->igmp_group = inm->inm_addr; |
| 628 | igmp->igmp_cksum = 0; |
| 629 | igmp->igmp_cksum = in_cksum(m, IGMP_MINLEN); |
| 630 | m->m_data -= sizeof(struct ip); |
| 631 | m->m_len += sizeof(struct ip); |
| 632 | |
| 633 | imo.imo_multicast_if_index = if_get_index(inm->inm_ifp); |
| 634 | imo.imo_multicast_ttl = 1; |
| 635 | #ifdef RSVP_ISI |
| 636 | imo.imo_multicast_vif = -1; |
| 637 | #endif |
| 638 | /* |
| 639 | * Request loopback of the report if we are acting as a multicast |
| 640 | * router, so that the process-level routing demon can hear it. |
| 641 | */ |
| 642 | #ifdef MROUTING |
| 643 | extern struct socket *ip_mrouter; |
| 644 | imo.imo_multicast_loop = (ip_mrouter != NULL); |
| 645 | #else |
| 646 | imo.imo_multicast_loop = 0; |
| 647 | #endif |
| 648 | |
| 649 | /* |
| 650 | * Note: IP_IGMP_MCAST indicates that in_multilock is held. |
| 651 | * The caller must still acquire softnet_lock for ip_output(). |
| 652 | */ |
| 653 | KASSERT(mutex_owned(softnet_lock)); |
| 654 | ip_output(m, NULL, NULL, IP_IGMP_MCAST, &imo, NULL); |
| 655 | IGMP_STATINC(IGMP_STAT_SND_REPORTS); |
| 656 | } |
| 657 | |
| 658 | void |
| 659 | igmp_purgeif(ifnet_t *ifp) |
| 660 | { |
| 661 | in_multi_lock(RW_WRITER); |
| 662 | rti_delete(ifp); |
| 663 | in_multi_unlock(); |
| 664 | } |
| 665 | |
| 666 | static int |
| 667 | sysctl_net_inet_igmp_stats(SYSCTLFN_ARGS) |
| 668 | { |
| 669 | return NETSTAT_SYSCTL(igmpstat_percpu, IGMP_NSTATS); |
| 670 | } |
| 671 | |
| 672 | static void |
| 673 | sysctl_net_inet_igmp_setup(struct sysctllog **clog) |
| 674 | { |
| 675 | sysctl_createv(clog, 0, NULL, NULL, |
| 676 | CTLFLAG_PERMANENT, |
| 677 | CTLTYPE_NODE, "inet" , NULL, |
| 678 | NULL, 0, NULL, 0, |
| 679 | CTL_NET, PF_INET, CTL_EOL); |
| 680 | sysctl_createv(clog, 0, NULL, NULL, |
| 681 | CTLFLAG_PERMANENT, |
| 682 | CTLTYPE_NODE, "igmp" , |
| 683 | SYSCTL_DESCR("Internet Group Management Protocol" ), |
| 684 | NULL, 0, NULL, 0, |
| 685 | CTL_NET, PF_INET, IPPROTO_IGMP, CTL_EOL); |
| 686 | sysctl_createv(clog, 0, NULL, NULL, |
| 687 | CTLFLAG_PERMANENT, |
| 688 | CTLTYPE_STRUCT, "stats" , |
| 689 | SYSCTL_DESCR("IGMP statistics" ), |
| 690 | sysctl_net_inet_igmp_stats, 0, NULL, 0, |
| 691 | CTL_NET, PF_INET, IPPROTO_IGMP, CTL_CREATE, CTL_EOL); |
| 692 | } |
| 693 | |