1 /* $OpenBSD: interface.c,v 1.81 2015/12/05 12:20:13 claudio Exp $ */ 2 3 /* 4 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org> 5 * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/types.h> 21 #include <sys/ioctl.h> 22 #include <sys/time.h> 23 #include <sys/socket.h> 24 #include <netinet/in.h> 25 #include <arpa/inet.h> 26 #include <net/if.h> 27 #include <net/if_types.h> 28 #include <ctype.h> 29 #include <err.h> 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <unistd.h> 33 #include <string.h> 34 #include <event.h> 35 36 #include "ospfd.h" 37 #include "ospf.h" 38 #include "log.h" 39 #include "ospfe.h" 40 41 void if_hello_timer(int, short, void *); 42 void if_start_hello_timer(struct iface *); 43 void if_stop_hello_timer(struct iface *); 44 void if_stop_wait_timer(struct iface *); 45 void if_wait_timer(int, short, void *); 46 void if_start_wait_timer(struct iface *); 47 void if_stop_wait_timer(struct iface *); 48 struct nbr *if_elect(struct nbr *, struct nbr *); 49 50 struct { 51 int state; 52 enum iface_event event; 53 enum iface_action action; 54 int new_state; 55 } iface_fsm[] = { 56 /* current state event that happened action to take resulting state */ 57 {IF_STA_DOWN, IF_EVT_UP, IF_ACT_STRT, 0}, 58 {IF_STA_WAITING, IF_EVT_BACKUP_SEEN, IF_ACT_ELECT, 0}, 59 {IF_STA_WAITING, IF_EVT_WTIMER, IF_ACT_ELECT, 0}, 60 {IF_STA_ANY, IF_EVT_WTIMER, IF_ACT_NOTHING, 0}, 61 {IF_STA_WAITING, IF_EVT_NBR_CHNG, IF_ACT_NOTHING, 0}, 62 {IF_STA_MULTI, IF_EVT_NBR_CHNG, IF_ACT_ELECT, 0}, 63 {IF_STA_ANY, IF_EVT_NBR_CHNG, IF_ACT_NOTHING, 0}, 64 {IF_STA_ANY, IF_EVT_DOWN, IF_ACT_RST, IF_STA_DOWN}, 65 {IF_STA_ANY, IF_EVT_LOOP, IF_ACT_RST, IF_STA_LOOPBACK}, 66 {IF_STA_LOOPBACK, IF_EVT_UNLOOP, IF_ACT_NOTHING, IF_STA_DOWN}, 67 {-1, IF_EVT_NOTHING, IF_ACT_NOTHING, 0}, 68 }; 69 70 static int vlink_cnt = 0; 71 72 const char * const if_event_names[] = { 73 "NOTHING", 74 "UP", 75 "WAITTIMER", 76 "BACKUPSEEN", 77 "NEIGHBORCHANGE", 78 "LOOP", 79 "UNLOOP", 80 "DOWN" 81 }; 82 83 const char * const if_action_names[] = { 84 "NOTHING", 85 "START", 86 "ELECT", 87 "RESET" 88 }; 89 90 int 91 if_fsm(struct iface *iface, enum iface_event event) 92 { 93 int old_state; 94 int new_state = 0; 95 int i, ret = 0; 96 97 old_state = iface->state; 98 99 for (i = 0; iface_fsm[i].state != -1; i++) 100 if ((iface_fsm[i].state & old_state) && 101 (iface_fsm[i].event == event)) { 102 new_state = iface_fsm[i].new_state; 103 break; 104 } 105 106 if (iface_fsm[i].state == -1) { 107 /* event outside of the defined fsm, ignore it. */ 108 log_debug("if_fsm: interface %s, " 109 "event %s not expected in state %s", iface->name, 110 if_event_names[event], if_state_name(old_state)); 111 return (0); 112 } 113 114 switch (iface_fsm[i].action) { 115 case IF_ACT_STRT: 116 ret = if_act_start(iface); 117 break; 118 case IF_ACT_ELECT: 119 ret = if_act_elect(iface); 120 break; 121 case IF_ACT_RST: 122 ret = if_act_reset(iface); 123 break; 124 case IF_ACT_NOTHING: 125 /* do nothing */ 126 break; 127 } 128 129 if (ret) { 130 log_debug("if_fsm: error changing state for interface %s, " 131 "event %s, state %s", iface->name, if_event_names[event], 132 if_state_name(old_state)); 133 return (-1); 134 } 135 136 if (new_state != 0) 137 iface->state = new_state; 138 139 if (iface->state != old_state) { 140 area_track(iface->area); 141 orig_rtr_lsa(iface->area); 142 } 143 144 if (old_state & (IF_STA_MULTI | IF_STA_POINTTOPOINT) && 145 (iface->state & (IF_STA_MULTI | IF_STA_POINTTOPOINT)) == 0) 146 ospfe_demote_iface(iface, 0); 147 if ((old_state & (IF_STA_MULTI | IF_STA_POINTTOPOINT)) == 0 && 148 iface->state & (IF_STA_MULTI | IF_STA_POINTTOPOINT)) 149 ospfe_demote_iface(iface, 1); 150 151 log_debug("if_fsm: event %s resulted in action %s and changing " 152 "state for interface %s from %s to %s", 153 if_event_names[event], if_action_names[iface_fsm[i].action], 154 iface->name, if_state_name(old_state), if_state_name(iface->state)); 155 156 return (ret); 157 } 158 159 struct iface * 160 if_new(struct kif *kif, struct kif_addr *ka) 161 { 162 struct iface *iface; 163 164 if ((iface = calloc(1, sizeof(*iface))) == NULL) 165 err(1, "if_new: calloc"); 166 167 iface->state = IF_STA_DOWN; 168 169 LIST_INIT(&iface->nbr_list); 170 TAILQ_INIT(&iface->ls_ack_list); 171 TAILQ_INIT(&iface->auth_md_list); 172 RB_INIT(&iface->lsa_tree); 173 174 iface->crypt_seq_num = arc4random() & 0x0fffffff; 175 176 if (kif == NULL) { 177 iface->type = IF_TYPE_VIRTUALLINK; 178 snprintf(iface->name, sizeof(iface->name), "vlink%d", 179 vlink_cnt++); 180 iface->flags |= IFF_UP; 181 iface->mtu = IP_MSS; 182 return (iface); 183 } 184 185 strlcpy(iface->name, kif->ifname, sizeof(iface->name)); 186 187 /* get type */ 188 if (kif->flags & IFF_POINTOPOINT) 189 iface->type = IF_TYPE_POINTOPOINT; 190 if (kif->flags & IFF_BROADCAST && 191 kif->flags & IFF_MULTICAST) 192 iface->type = IF_TYPE_BROADCAST; 193 if (kif->flags & IFF_LOOPBACK) { 194 iface->type = IF_TYPE_POINTOPOINT; 195 iface->passive = 1; 196 } 197 198 /* get mtu, index and flags */ 199 iface->mtu = kif->mtu; 200 iface->ifindex = kif->ifindex; 201 iface->rdomain = kif->rdomain; 202 iface->flags = kif->flags; 203 iface->linkstate = kif->link_state; 204 iface->if_type = kif->if_type; 205 iface->baudrate = kif->baudrate; 206 207 /* set address, mask and p2p addr */ 208 iface->addr = ka->addr; 209 iface->mask = ka->mask; 210 if (kif->flags & IFF_POINTOPOINT) { 211 iface->dst = ka->dstbrd; 212 } 213 214 return (iface); 215 } 216 217 void 218 if_del(struct iface *iface) 219 { 220 struct nbr *nbr = NULL; 221 222 /* revert the demotion when the interface is deleted */ 223 if ((iface->state & (IF_STA_MULTI | IF_STA_POINTTOPOINT)) == 0) 224 ospfe_demote_iface(iface, 1); 225 226 /* clear lists etc */ 227 while ((nbr = LIST_FIRST(&iface->nbr_list)) != NULL) 228 nbr_del(nbr); 229 230 if (evtimer_pending(&iface->hello_timer, NULL)) 231 evtimer_del(&iface->hello_timer); 232 if (evtimer_pending(&iface->wait_timer, NULL)) 233 evtimer_del(&iface->wait_timer); 234 if (evtimer_pending(&iface->lsack_tx_timer, NULL)) 235 evtimer_del(&iface->lsack_tx_timer); 236 237 ls_ack_list_clr(iface); 238 md_list_clr(&iface->auth_md_list); 239 free(iface); 240 } 241 242 void 243 if_init(struct ospfd_conf *xconf, struct iface *iface) 244 { 245 /* init the dummy local neighbor */ 246 iface->self = nbr_new(ospfe_router_id(), iface, 1); 247 248 /* set event handlers for interface */ 249 evtimer_set(&iface->lsack_tx_timer, ls_ack_tx_timer, iface); 250 evtimer_set(&iface->hello_timer, if_hello_timer, iface); 251 evtimer_set(&iface->wait_timer, if_wait_timer, iface); 252 253 iface->fd = xconf->ospf_socket; 254 255 ospfe_demote_iface(iface, 0); 256 } 257 258 /* timers */ 259 /* ARGSUSED */ 260 void 261 if_hello_timer(int fd, short event, void *arg) 262 { 263 struct iface *iface = arg; 264 struct timeval tv; 265 266 send_hello(iface); 267 268 /* reschedule hello_timer */ 269 timerclear(&tv); 270 if (iface->dead_interval == FAST_RTR_DEAD_TIME) 271 tv.tv_usec = iface->fast_hello_interval * 1000; 272 else 273 tv.tv_sec = iface->hello_interval; 274 if (evtimer_add(&iface->hello_timer, &tv) == -1) 275 fatal("if_hello_timer"); 276 } 277 278 void 279 if_start_hello_timer(struct iface *iface) 280 { 281 struct timeval tv; 282 283 timerclear(&tv); 284 if (evtimer_add(&iface->hello_timer, &tv) == -1) 285 fatal("if_start_hello_timer"); 286 } 287 288 void 289 if_stop_hello_timer(struct iface *iface) 290 { 291 if (evtimer_del(&iface->hello_timer) == -1) 292 fatal("if_stop_hello_timer"); 293 } 294 295 /* ARGSUSED */ 296 void 297 if_wait_timer(int fd, short event, void *arg) 298 { 299 struct iface *iface = arg; 300 301 if_fsm(iface, IF_EVT_WTIMER); 302 } 303 304 void 305 if_start_wait_timer(struct iface *iface) 306 { 307 struct timeval tv; 308 309 timerclear(&tv); 310 tv.tv_sec = iface->dead_interval; 311 if (evtimer_add(&iface->wait_timer, &tv) == -1) 312 fatal("if_start_wait_timer"); 313 } 314 315 void 316 if_stop_wait_timer(struct iface *iface) 317 { 318 if (evtimer_del(&iface->wait_timer) == -1) 319 fatal("if_stop_wait_timer"); 320 } 321 322 /* actions */ 323 int 324 if_act_start(struct iface *iface) 325 { 326 struct in_addr addr; 327 struct timeval now; 328 329 if (!(iface->flags & IFF_UP) || 330 (!LINK_STATE_IS_UP(iface->linkstate) && 331 !(iface->if_type == IFT_CARP && 332 iface->linkstate == LINK_STATE_DOWN))) 333 return (0); 334 335 if (iface->if_type == IFT_CARP && iface->passive == 0) { 336 /* force passive mode on carp interfaces */ 337 log_warnx("if_act_start: forcing interface %s to passive", 338 iface->name); 339 iface->passive = 1; 340 } 341 342 gettimeofday(&now, NULL); 343 iface->uptime = now.tv_sec; 344 345 /* loopback interfaces have a special state and are passive */ 346 if (iface->flags & IFF_LOOPBACK) 347 iface->state = IF_STA_LOOPBACK; 348 349 if (iface->passive) { 350 /* for an update of stub network entries */ 351 orig_rtr_lsa(iface->area); 352 return (0); 353 } 354 355 switch (iface->type) { 356 case IF_TYPE_POINTOPOINT: 357 inet_aton(AllSPFRouters, &addr); 358 if (if_join_group(iface, &addr)) 359 return (-1); 360 iface->state = IF_STA_POINTTOPOINT; 361 break; 362 case IF_TYPE_VIRTUALLINK: 363 iface->state = IF_STA_POINTTOPOINT; 364 break; 365 case IF_TYPE_POINTOMULTIPOINT: 366 case IF_TYPE_NBMA: 367 log_debug("if_act_start: type %s not supported, interface %s", 368 if_type_name(iface->type), iface->name); 369 return (-1); 370 case IF_TYPE_BROADCAST: 371 inet_aton(AllSPFRouters, &addr); 372 if (if_join_group(iface, &addr)) 373 return (-1); 374 if (iface->priority == 0) { 375 iface->state = IF_STA_DROTHER; 376 } else { 377 iface->state = IF_STA_WAITING; 378 if_start_wait_timer(iface); 379 } 380 break; 381 default: 382 fatalx("if_act_start: unknown interface type"); 383 } 384 385 /* hello timer needs to be started in any case */ 386 if_start_hello_timer(iface); 387 return (0); 388 } 389 390 struct nbr * 391 if_elect(struct nbr *a, struct nbr *b) 392 { 393 if (a->priority > b->priority) 394 return (a); 395 if (a->priority < b->priority) 396 return (b); 397 if (ntohl(a->id.s_addr) > ntohl(b->id.s_addr)) 398 return (a); 399 return (b); 400 } 401 402 int 403 if_act_elect(struct iface *iface) 404 { 405 struct in_addr addr; 406 struct nbr *nbr, *bdr = NULL, *dr = NULL; 407 int round = 0; 408 int changed = 0; 409 int old_state; 410 char b1[16], b2[16], b3[16], b4[16]; 411 412 start: 413 /* elect backup designated router */ 414 LIST_FOREACH(nbr, &iface->nbr_list, entry) { 415 if (nbr->priority == 0 || nbr == dr || /* not electable */ 416 nbr->state & NBR_STA_PRELIM || /* not available */ 417 nbr->dr.s_addr == nbr->addr.s_addr) /* don't elect DR */ 418 continue; 419 if (bdr != NULL) { 420 /* 421 * routers announcing themselves as BDR have higher 422 * precedence over those routers announcing a 423 * different BDR. 424 */ 425 if (nbr->bdr.s_addr == nbr->addr.s_addr) { 426 if (bdr->bdr.s_addr == bdr->addr.s_addr) 427 bdr = if_elect(bdr, nbr); 428 else 429 bdr = nbr; 430 } else if (bdr->bdr.s_addr != bdr->addr.s_addr) 431 bdr = if_elect(bdr, nbr); 432 } else 433 bdr = nbr; 434 } 435 436 /* elect designated router */ 437 LIST_FOREACH(nbr, &iface->nbr_list, entry) { 438 if (nbr->priority == 0 || nbr->state & NBR_STA_PRELIM || 439 (nbr != dr && nbr->dr.s_addr != nbr->addr.s_addr)) 440 /* only DR may be elected check priority too */ 441 continue; 442 if (dr == NULL) 443 dr = nbr; 444 else 445 dr = if_elect(dr, nbr); 446 } 447 448 if (dr == NULL) { 449 /* no designated router found use backup DR */ 450 dr = bdr; 451 bdr = NULL; 452 } 453 454 /* 455 * if we are involved in the election (e.g. new DR or no 456 * longer BDR) redo the election 457 */ 458 if (round == 0 && 459 ((iface->self == dr && iface->self != iface->dr) || 460 (iface->self != dr && iface->self == iface->dr) || 461 (iface->self == bdr && iface->self != iface->bdr) || 462 (iface->self != bdr && iface->self == iface->bdr))) { 463 /* 464 * Reset announced DR/BDR to calculated one, so 465 * that we may get elected in the second round. 466 * This is needed to drop from a DR to a BDR. 467 */ 468 iface->self->dr.s_addr = dr->addr.s_addr; 469 if (bdr) 470 iface->self->bdr.s_addr = bdr->addr.s_addr; 471 round = 1; 472 goto start; 473 } 474 475 log_debug("if_act_elect: interface %s old dr %s new dr %s, " 476 "old bdr %s new bdr %s", iface->name, 477 iface->dr ? inet_ntop(AF_INET, &iface->dr->addr, b1, sizeof(b1)) : 478 "none", dr ? inet_ntop(AF_INET, &dr->addr, b2, sizeof(b2)) : "none", 479 iface->bdr ? inet_ntop(AF_INET, &iface->bdr->addr, b3, sizeof(b3)) : 480 "none", bdr ? inet_ntop(AF_INET, &bdr->addr, b4, sizeof(b4)) : 481 "none"); 482 483 /* 484 * After the second round still DR or BDR change state to DR or BDR, 485 * etc. 486 */ 487 old_state = iface->state; 488 if (dr == iface->self) 489 iface->state = IF_STA_DR; 490 else if (bdr == iface->self) 491 iface->state = IF_STA_BACKUP; 492 else 493 iface->state = IF_STA_DROTHER; 494 495 /* TODO if iface is NBMA send all non eligible neighbors event Start */ 496 497 /* 498 * if DR or BDR changed issue a AdjOK? event for all neighbors > 2-Way 499 */ 500 if (iface->dr != dr || iface->bdr != bdr) 501 changed = 1; 502 503 iface->dr = dr; 504 iface->bdr = bdr; 505 506 if (changed) { 507 inet_aton(AllDRouters, &addr); 508 if (old_state & IF_STA_DRORBDR && 509 (iface->state & IF_STA_DRORBDR) == 0) { 510 if (if_leave_group(iface, &addr)) 511 return (-1); 512 } else if ((old_state & IF_STA_DRORBDR) == 0 && 513 iface->state & IF_STA_DRORBDR) { 514 if (if_join_group(iface, &addr)) 515 return (-1); 516 } 517 518 LIST_FOREACH(nbr, &iface->nbr_list, entry) { 519 if (nbr->state & NBR_STA_BIDIR) 520 nbr_fsm(nbr, NBR_EVT_ADJ_OK); 521 } 522 523 orig_rtr_lsa(iface->area); 524 if (iface->state & IF_STA_DR || old_state & IF_STA_DR) 525 orig_net_lsa(iface); 526 } 527 528 if_start_hello_timer(iface); 529 return (0); 530 } 531 532 int 533 if_act_reset(struct iface *iface) 534 { 535 struct nbr *nbr = NULL; 536 struct in_addr addr; 537 538 if (iface->passive) { 539 /* for an update of stub network entries */ 540 orig_rtr_lsa(iface->area); 541 return (0); 542 } 543 544 switch (iface->type) { 545 case IF_TYPE_POINTOPOINT: 546 case IF_TYPE_BROADCAST: 547 /* try to cleanup */ 548 inet_aton(AllSPFRouters, &addr); 549 if_leave_group(iface, &addr); 550 if (iface->state & IF_STA_DRORBDR) { 551 inet_aton(AllDRouters, &addr); 552 if_leave_group(iface, &addr); 553 } 554 break; 555 case IF_TYPE_VIRTUALLINK: 556 /* nothing */ 557 break; 558 case IF_TYPE_NBMA: 559 case IF_TYPE_POINTOMULTIPOINT: 560 log_debug("if_act_reset: type %s not supported, interface %s", 561 if_type_name(iface->type), iface->name); 562 return (-1); 563 default: 564 fatalx("if_act_reset: unknown interface type"); 565 } 566 567 LIST_FOREACH(nbr, &iface->nbr_list, entry) { 568 if (nbr_fsm(nbr, NBR_EVT_KILL_NBR)) { 569 log_debug("if_act_reset: error killing neighbor %s", 570 inet_ntoa(nbr->id)); 571 } 572 } 573 574 iface->dr = NULL; 575 iface->bdr = NULL; 576 577 ls_ack_list_clr(iface); 578 stop_ls_ack_tx_timer(iface); 579 if_stop_hello_timer(iface); 580 if_stop_wait_timer(iface); 581 582 /* send empty hello to tell everybody that we are going down */ 583 send_hello(iface); 584 585 return (0); 586 } 587 588 struct ctl_iface * 589 if_to_ctl(struct iface *iface) 590 { 591 static struct ctl_iface ictl; 592 struct timeval tv, now, res; 593 struct nbr *nbr; 594 595 memcpy(ictl.name, iface->name, sizeof(ictl.name)); 596 memcpy(&ictl.addr, &iface->addr, sizeof(ictl.addr)); 597 memcpy(&ictl.mask, &iface->mask, sizeof(ictl.mask)); 598 ictl.rtr_id.s_addr = ospfe_router_id(); 599 memcpy(&ictl.area, &iface->area->id, sizeof(ictl.area)); 600 if (iface->dr) { 601 memcpy(&ictl.dr_id, &iface->dr->id, sizeof(ictl.dr_id)); 602 memcpy(&ictl.dr_addr, &iface->dr->addr, sizeof(ictl.dr_addr)); 603 } else { 604 bzero(&ictl.dr_id, sizeof(ictl.dr_id)); 605 bzero(&ictl.dr_addr, sizeof(ictl.dr_addr)); 606 } 607 if (iface->bdr) { 608 memcpy(&ictl.bdr_id, &iface->bdr->id, sizeof(ictl.bdr_id)); 609 memcpy(&ictl.bdr_addr, &iface->bdr->addr, 610 sizeof(ictl.bdr_addr)); 611 } else { 612 bzero(&ictl.bdr_id, sizeof(ictl.bdr_id)); 613 bzero(&ictl.bdr_addr, sizeof(ictl.bdr_addr)); 614 } 615 ictl.ifindex = iface->ifindex; 616 ictl.state = iface->state; 617 ictl.mtu = iface->mtu; 618 ictl.nbr_cnt = 0; 619 ictl.adj_cnt = 0; 620 ictl.baudrate = iface->baudrate; 621 ictl.dead_interval = iface->dead_interval; 622 ictl.fast_hello_interval = iface->fast_hello_interval; 623 ictl.transmit_delay = iface->transmit_delay; 624 ictl.hello_interval = iface->hello_interval; 625 ictl.flags = iface->flags; 626 ictl.metric = iface->metric; 627 ictl.rxmt_interval = iface->rxmt_interval; 628 ictl.type = iface->type; 629 ictl.linkstate = iface->linkstate; 630 ictl.if_type = iface->if_type; 631 ictl.priority = iface->priority; 632 ictl.passive = iface->passive; 633 ictl.auth_type = iface->auth_type; 634 ictl.auth_keyid = iface->auth_keyid; 635 636 gettimeofday(&now, NULL); 637 if (evtimer_pending(&iface->hello_timer, &tv)) { 638 timersub(&tv, &now, &res); 639 ictl.hello_timer = res; 640 } else { 641 ictl.hello_timer.tv_sec = -1; 642 } 643 644 if (iface->state != IF_STA_DOWN && 645 iface->uptime != 0) { 646 ictl.uptime = now.tv_sec - iface->uptime; 647 } else 648 ictl.uptime = 0; 649 650 LIST_FOREACH(nbr, &iface->nbr_list, entry) { 651 if (nbr == iface->self) 652 continue; 653 ictl.nbr_cnt++; 654 if (nbr->state & NBR_STA_ADJFORM) 655 ictl.adj_cnt++; 656 } 657 658 return (&ictl); 659 } 660 661 /* misc */ 662 int 663 if_set_recvif(int fd, int enable) 664 { 665 if (setsockopt(fd, IPPROTO_IP, IP_RECVIF, &enable, 666 sizeof(enable)) < 0) { 667 log_warn("if_set_recvif: error setting IP_RECVIF"); 668 return (-1); 669 } 670 return (0); 671 } 672 673 void 674 if_set_sockbuf(int fd) 675 { 676 int bsize; 677 678 bsize = 65535; 679 while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize, 680 sizeof(bsize)) == -1) 681 bsize /= 2; 682 683 if (bsize != 65535) 684 log_warnx("if_set_sockbuf: recvbuf size only %d", bsize); 685 686 bsize = 65535; 687 while (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &bsize, 688 sizeof(bsize)) == -1) 689 bsize /= 2; 690 691 if (bsize != 65535) 692 log_warnx("if_set_sockbuf: sendbuf size only %d", bsize); 693 } 694 695 /* 696 * only one JOIN or DROP per interface and address is allowed so we need 697 * to keep track of what is added and removed. 698 */ 699 struct if_group_count { 700 LIST_ENTRY(if_group_count) entry; 701 struct in_addr addr; 702 unsigned int ifindex; 703 int count; 704 }; 705 706 LIST_HEAD(,if_group_count) ifglist = LIST_HEAD_INITIALIZER(ifglist); 707 708 int 709 if_join_group(struct iface *iface, struct in_addr *addr) 710 { 711 struct ip_mreq mreq; 712 struct if_group_count *ifg; 713 714 switch (iface->type) { 715 case IF_TYPE_POINTOPOINT: 716 case IF_TYPE_BROADCAST: 717 LIST_FOREACH(ifg, &ifglist, entry) 718 if (iface->ifindex == ifg->ifindex && 719 addr->s_addr == ifg->addr.s_addr) 720 break; 721 if (ifg == NULL) { 722 if ((ifg = calloc(1, sizeof(*ifg))) == NULL) 723 fatal("if_join_group"); 724 ifg->addr.s_addr = addr->s_addr; 725 ifg->ifindex = iface->ifindex; 726 LIST_INSERT_HEAD(&ifglist, ifg, entry); 727 } 728 729 if (ifg->count++ != 0) 730 /* already joined */ 731 return (0); 732 733 mreq.imr_multiaddr.s_addr = addr->s_addr; 734 mreq.imr_interface.s_addr = iface->addr.s_addr; 735 736 if (setsockopt(iface->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, 737 (void *)&mreq, sizeof(mreq)) < 0) { 738 log_warn("if_join_group: error IP_ADD_MEMBERSHIP, " 739 "interface %s address %s", iface->name, 740 inet_ntoa(*addr)); 741 return (-1); 742 } 743 break; 744 case IF_TYPE_POINTOMULTIPOINT: 745 case IF_TYPE_VIRTUALLINK: 746 case IF_TYPE_NBMA: 747 log_debug("if_join_group: type %s not supported, interface %s", 748 if_type_name(iface->type), iface->name); 749 return (-1); 750 default: 751 fatalx("if_join_group: unknown interface type"); 752 } 753 754 return (0); 755 } 756 757 int 758 if_leave_group(struct iface *iface, struct in_addr *addr) 759 { 760 struct ip_mreq mreq; 761 struct if_group_count *ifg; 762 763 switch (iface->type) { 764 case IF_TYPE_POINTOPOINT: 765 case IF_TYPE_BROADCAST: 766 LIST_FOREACH(ifg, &ifglist, entry) 767 if (iface->ifindex == ifg->ifindex && 768 addr->s_addr == ifg->addr.s_addr) 769 break; 770 771 /* if interface is not found just try to drop membership */ 772 if (ifg) { 773 if (--ifg->count != 0) 774 /* others still joined */ 775 return (0); 776 777 LIST_REMOVE(ifg, entry); 778 free(ifg); 779 } 780 781 mreq.imr_multiaddr.s_addr = addr->s_addr; 782 mreq.imr_interface.s_addr = iface->addr.s_addr; 783 784 if (setsockopt(iface->fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, 785 (void *)&mreq, sizeof(mreq)) < 0) { 786 log_warn("if_leave_group: error IP_DROP_MEMBERSHIP, " 787 "interface %s address %s", iface->name, 788 inet_ntoa(*addr)); 789 return (-1); 790 } 791 break; 792 case IF_TYPE_POINTOMULTIPOINT: 793 case IF_TYPE_VIRTUALLINK: 794 case IF_TYPE_NBMA: 795 log_debug("if_leave_group: type %s not supported, interface %s", 796 if_type_name(iface->type), iface->name); 797 return (-1); 798 default: 799 fatalx("if_leave_group: unknown interface type"); 800 } 801 802 return (0); 803 } 804 805 int 806 if_set_mcast(struct iface *iface) 807 { 808 switch (iface->type) { 809 case IF_TYPE_POINTOPOINT: 810 case IF_TYPE_BROADCAST: 811 if (setsockopt(iface->fd, IPPROTO_IP, IP_MULTICAST_IF, 812 &iface->addr.s_addr, sizeof(iface->addr.s_addr)) < 0) { 813 log_warn("if_set_mcast: error setting " 814 "IP_MULTICAST_IF, interface %s", iface->name); 815 return (-1); 816 } 817 break; 818 case IF_TYPE_POINTOMULTIPOINT: 819 case IF_TYPE_VIRTUALLINK: 820 case IF_TYPE_NBMA: 821 log_debug("if_set_mcast: type %s not supported, interface %s", 822 if_type_name(iface->type), iface->name); 823 return (-1); 824 default: 825 fatalx("if_set_mcast: unknown interface type"); 826 } 827 828 return (0); 829 } 830 831 int 832 if_set_mcast_loop(int fd) 833 { 834 u_int8_t loop = 0; 835 836 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, 837 (char *)&loop, sizeof(loop)) < 0) { 838 log_warn("if_set_mcast_loop: error setting IP_MULTICAST_LOOP"); 839 return (-1); 840 } 841 842 return (0); 843 } 844 845 int 846 if_set_ip_hdrincl(int fd) 847 { 848 int hincl = 1; 849 850 if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &hincl, sizeof(hincl)) < 0) { 851 log_warn("if_set_ip_hdrincl: error setting IP_HDRINCL"); 852 return (-1); 853 } 854 855 return (0); 856 } 857