1 /* $OpenBSD: kroute.c,v 1.117 2023/03/08 04:43:14 guenther Exp $ */ 2 3 /* 4 * Copyright (c) 2004 Esben Norby <norby@openbsd.org> 5 * Copyright (c) 2003, 2004 Henning Brauer <henning@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/socket.h> 22 #include <sys/sysctl.h> 23 #include <sys/tree.h> 24 #include <sys/uio.h> 25 #include <netinet/in.h> 26 #include <arpa/inet.h> 27 #include <net/if.h> 28 #include <net/if_dl.h> 29 #include <net/if_types.h> 30 #include <net/route.h> 31 #include <err.h> 32 #include <errno.h> 33 #include <fcntl.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <limits.h> 39 40 #include "ospfd.h" 41 #include "log.h" 42 43 struct { 44 u_int32_t rtseq; 45 pid_t pid; 46 int fib_sync; 47 int fib_serial; 48 u_int8_t fib_prio; 49 int fd; 50 struct event ev; 51 struct event reload; 52 u_int rdomain; 53 #define KR_RELOAD_IDLE 0 54 #define KR_RELOAD_FETCH 1 55 #define KR_RELOAD_HOLD 2 56 int reload_state; 57 } kr_state; 58 59 struct kroute_node { 60 RB_ENTRY(kroute_node) entry; 61 struct kroute_node *next; 62 struct kroute r; 63 int serial; 64 }; 65 66 struct kif_node { 67 RB_ENTRY(kif_node) entry; 68 TAILQ_HEAD(, kif_addr) addrs; 69 struct kif k; 70 }; 71 72 void kr_redist_remove(struct kroute_node *, struct kroute_node *); 73 int kr_redist_eval(struct kroute *, struct kroute *); 74 void kr_redistribute(struct kroute_node *); 75 int kroute_compare(struct kroute_node *, struct kroute_node *); 76 int kif_compare(struct kif_node *, struct kif_node *); 77 int kr_change_fib(struct kroute_node *, struct kroute *, int, int); 78 int kr_delete_fib(struct kroute_node *); 79 80 struct kroute_node *kroute_find(in_addr_t, u_int8_t, u_int8_t); 81 struct kroute_node *kroute_matchgw(struct kroute_node *, struct in_addr); 82 int kroute_insert(struct kroute_node *); 83 int kroute_remove(struct kroute_node *); 84 void kroute_clear(void); 85 86 struct kif_node *kif_find(u_short); 87 struct kif_node *kif_insert(u_short); 88 int kif_remove(struct kif_node *); 89 struct kif *kif_update(u_short, int, struct if_data *, 90 struct sockaddr_dl *); 91 int kif_validate(u_short); 92 93 struct kroute_node *kroute_match(in_addr_t); 94 95 int protect_lo(void); 96 u_int8_t prefixlen_classful(in_addr_t); 97 void get_rtaddrs(int, struct sockaddr *, struct sockaddr **); 98 void if_change(u_short, int, struct if_data *, struct sockaddr_dl *); 99 void if_newaddr(u_short, struct sockaddr_in *, struct sockaddr_in *, 100 struct sockaddr_in *); 101 void if_deladdr(u_short, struct sockaddr_in *, struct sockaddr_in *, 102 struct sockaddr_in *); 103 void if_announce(void *); 104 105 int send_rtmsg(int, int, struct kroute *); 106 int dispatch_rtmsg(void); 107 int fetchtable(void); 108 int fetchifs(u_short); 109 int rtmsg_process(char *, size_t); 110 void kr_fib_reload_timer(int, short, void *); 111 void kr_fib_reload_arm_timer(int); 112 113 RB_HEAD(kroute_tree, kroute_node) krt = RB_INITIALIZER(&krt); 114 RB_PROTOTYPE(kroute_tree, kroute_node, entry, kroute_compare) 115 RB_GENERATE(kroute_tree, kroute_node, entry, kroute_compare) 116 117 RB_HEAD(kif_tree, kif_node) kit = RB_INITIALIZER(&kit); 118 RB_PROTOTYPE(kif_tree, kif_node, entry, kif_compare) 119 RB_GENERATE(kif_tree, kif_node, entry, kif_compare) 120 121 int 122 kif_init(void) 123 { 124 if (fetchifs(0) == -1) 125 return (-1); 126 127 return (0); 128 } 129 130 int 131 kr_init(int fs, u_int rdomain, int redis_label_or_prefix, u_int8_t fib_prio) 132 { 133 int opt = 0, rcvbuf, default_rcvbuf; 134 socklen_t optlen; 135 int filter_prio = fib_prio; 136 int filter_flags = RTF_LLINFO | RTF_BROADCAST; 137 138 kr_state.fib_sync = fs; 139 kr_state.rdomain = rdomain; 140 kr_state.fib_prio = fib_prio; 141 142 if ((kr_state.fd = socket(AF_ROUTE, 143 SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, AF_INET)) == -1) { 144 log_warn("kr_init: socket"); 145 return (-1); 146 } 147 148 /* not interested in my own messages */ 149 if (setsockopt(kr_state.fd, SOL_SOCKET, SO_USELOOPBACK, 150 &opt, sizeof(opt)) == -1) 151 log_warn("kr_init: setsockopt"); /* not fatal */ 152 153 if (redis_label_or_prefix) { 154 filter_prio = 0; 155 log_info("%s: priority filter disabled", __func__); 156 } else 157 log_debug("%s: priority filter enabled", __func__); 158 159 if (setsockopt(kr_state.fd, AF_ROUTE, ROUTE_PRIOFILTER, &filter_prio, 160 sizeof(filter_prio)) == -1) { 161 log_warn("%s: setsockopt AF_ROUTE ROUTE_PRIOFILTER", __func__); 162 /* not fatal */ 163 } 164 if (setsockopt(kr_state.fd, AF_ROUTE, ROUTE_FLAGFILTER, &filter_flags, 165 sizeof(filter_flags)) == -1) { 166 log_warn("%s: setsockopt AF_ROUTE ROUTE_FLAGFILTER", __func__); 167 /* not fatal */ 168 } 169 170 /* grow receive buffer, don't wanna miss messages */ 171 optlen = sizeof(default_rcvbuf); 172 if (getsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, 173 &default_rcvbuf, &optlen) == -1) 174 log_warn("kr_init getsockopt SOL_SOCKET SO_RCVBUF"); 175 else 176 for (rcvbuf = MAX_RTSOCK_BUF; 177 rcvbuf > default_rcvbuf && 178 setsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, 179 &rcvbuf, sizeof(rcvbuf)) == -1 && errno == ENOBUFS; 180 rcvbuf /= 2) 181 ; /* nothing */ 182 183 kr_state.pid = getpid(); 184 kr_state.rtseq = 1; 185 186 if (fetchtable() == -1) 187 return (-1); 188 189 if (protect_lo() == -1) 190 return (-1); 191 192 event_set(&kr_state.ev, kr_state.fd, EV_READ | EV_PERSIST, 193 kr_dispatch_msg, NULL); 194 event_add(&kr_state.ev, NULL); 195 196 kr_state.reload_state = KR_RELOAD_IDLE; 197 evtimer_set(&kr_state.reload, kr_fib_reload_timer, NULL); 198 199 return (0); 200 } 201 202 int 203 kr_change_fib(struct kroute_node *kr, struct kroute *kroute, int krcount, 204 int action) 205 { 206 int i; 207 struct kroute_node *kn, *nkn; 208 209 if (action == RTM_ADD) { 210 /* 211 * First remove all stale multipath routes. 212 * This step must be skipped when the action is RTM_CHANGE 213 * because it is already a single path route that will be 214 * changed. 215 */ 216 for (kn = kr; kn != NULL; kn = nkn) { 217 for (i = 0; i < krcount; i++) { 218 if (kn->r.nexthop.s_addr == 219 kroute[i].nexthop.s_addr) 220 break; 221 } 222 nkn = kn->next; 223 if (i == krcount) { 224 /* stale route */ 225 if (kr_delete_fib(kn) == -1) 226 log_warnx("kr_delete_fib failed"); 227 /* 228 * if head element was removed we need to adjust 229 * the head 230 */ 231 if (kr == kn) 232 kr = nkn; 233 } 234 } 235 } 236 237 /* 238 * now add or change the route 239 */ 240 for (i = 0; i < krcount; i++) { 241 /* nexthop within 127/8 -> ignore silently */ 242 if ((kroute[i].nexthop.s_addr & htonl(IN_CLASSA_NET)) == 243 htonl(INADDR_LOOPBACK & IN_CLASSA_NET)) 244 continue; 245 246 if (action == RTM_ADD && kr) { 247 for (kn = kr; kn != NULL; kn = kn->next) { 248 if (kn->r.nexthop.s_addr == 249 kroute[i].nexthop.s_addr) 250 break; 251 } 252 253 if (kn != NULL) 254 /* nexthop already present, skip it */ 255 continue; 256 } else 257 /* modify first entry */ 258 kn = kr; 259 260 /* send update */ 261 if (send_rtmsg(kr_state.fd, action, &kroute[i]) == -1) 262 return (-1); 263 264 /* create new entry unless we are changing the first entry */ 265 if (action == RTM_ADD) 266 if ((kn = calloc(1, sizeof(*kn))) == NULL) 267 fatal(NULL); 268 269 kn->r.prefix.s_addr = kroute[i].prefix.s_addr; 270 kn->r.prefixlen = kroute[i].prefixlen; 271 kn->r.nexthop.s_addr = kroute[i].nexthop.s_addr; 272 kn->r.flags = kroute[i].flags | F_OSPFD_INSERTED; 273 kn->r.priority = kr_state.fib_prio; 274 kn->r.ext_tag = kroute[i].ext_tag; 275 rtlabel_unref(kn->r.rtlabel); /* for RTM_CHANGE */ 276 kn->r.rtlabel = kroute[i].rtlabel; 277 278 if (action == RTM_ADD) 279 if (kroute_insert(kn) == -1) { 280 log_debug("kr_update_fib: cannot insert %s", 281 inet_ntoa(kn->r.nexthop)); 282 free(kn); 283 } 284 action = RTM_ADD; 285 } 286 return (0); 287 } 288 289 int 290 kr_change(struct kroute *kroute, int krcount) 291 { 292 struct kroute_node *kr; 293 int action = RTM_ADD; 294 295 kroute->rtlabel = rtlabel_tag2id(kroute->ext_tag); 296 297 kr = kroute_find(kroute->prefix.s_addr, kroute->prefixlen, 298 kr_state.fib_prio); 299 if (kr != NULL && kr->next == NULL && krcount == 1) 300 /* single path OSPF route */ 301 action = RTM_CHANGE; 302 303 return (kr_change_fib(kr, kroute, krcount, action)); 304 } 305 306 int 307 kr_delete_fib(struct kroute_node *kr) 308 { 309 if (kr->r.priority != kr_state.fib_prio) 310 log_warn("kr_delete_fib: %s/%d has wrong priority %d", 311 inet_ntoa(kr->r.prefix), kr->r.prefixlen, kr->r.priority); 312 313 if (send_rtmsg(kr_state.fd, RTM_DELETE, &kr->r) == -1) 314 return (-1); 315 316 if (kroute_remove(kr) == -1) 317 return (-1); 318 319 return (0); 320 } 321 322 int 323 kr_delete(struct kroute *kroute) 324 { 325 struct kroute_node *kr, *nkr; 326 327 if ((kr = kroute_find(kroute->prefix.s_addr, kroute->prefixlen, 328 kr_state.fib_prio)) == NULL) 329 return (0); 330 331 while (kr != NULL) { 332 nkr = kr->next; 333 if (kr_delete_fib(kr) == -1) 334 return (-1); 335 kr = nkr; 336 } 337 return (0); 338 } 339 340 void 341 kr_shutdown(void) 342 { 343 kr_fib_decouple(); 344 kroute_clear(); 345 kif_clear(); 346 } 347 348 void 349 kr_fib_couple(void) 350 { 351 struct kroute_node *kr; 352 struct kroute_node *kn; 353 354 if (kr_state.fib_sync == 1) /* already coupled */ 355 return; 356 357 kr_state.fib_sync = 1; 358 359 RB_FOREACH(kr, kroute_tree, &krt) 360 if (kr->r.priority == kr_state.fib_prio) 361 for (kn = kr; kn != NULL; kn = kn->next) 362 send_rtmsg(kr_state.fd, RTM_ADD, &kn->r); 363 364 log_info("kernel routing table coupled"); 365 } 366 367 void 368 kr_fib_decouple(void) 369 { 370 struct kroute_node *kr; 371 struct kroute_node *kn; 372 373 if (kr_state.fib_sync == 0) /* already decoupled */ 374 return; 375 376 RB_FOREACH(kr, kroute_tree, &krt) 377 if (kr->r.priority == kr_state.fib_prio) 378 for (kn = kr; kn != NULL; kn = kn->next) 379 send_rtmsg(kr_state.fd, RTM_DELETE, &kn->r); 380 381 kr_state.fib_sync = 0; 382 383 log_info("kernel routing table decoupled"); 384 } 385 386 void 387 kr_fib_reload_timer(int fd, short event, void *bula) 388 { 389 if (kr_state.reload_state == KR_RELOAD_FETCH) { 390 kr_fib_reload(); 391 kr_state.reload_state = KR_RELOAD_HOLD; 392 kr_fib_reload_arm_timer(KR_RELOAD_HOLD_TIMER); 393 } else { 394 kr_state.reload_state = KR_RELOAD_IDLE; 395 } 396 } 397 398 void 399 kr_fib_reload_arm_timer(int delay) 400 { 401 struct timeval tv; 402 403 timerclear(&tv); 404 tv.tv_sec = delay / 1000; 405 tv.tv_usec = (delay % 1000) * 1000; 406 407 if (evtimer_add(&kr_state.reload, &tv) == -1) 408 fatal("add_reload_timer"); 409 } 410 411 void 412 kr_fib_reload(void) 413 { 414 struct kroute_node *krn, *kr, *kn; 415 416 log_info("reloading interface list and routing table"); 417 418 kr_state.fib_serial++; 419 420 if (fetchifs(0) == -1 || fetchtable() == -1) 421 return; 422 423 for (kr = RB_MIN(kroute_tree, &krt); kr != NULL; kr = krn) { 424 krn = RB_NEXT(kroute_tree, &krt, kr); 425 426 do { 427 kn = kr->next; 428 429 if (kr->serial != kr_state.fib_serial) { 430 if (kr->r.priority == kr_state.fib_prio) { 431 kr->serial = kr_state.fib_serial; 432 if (send_rtmsg(kr_state.fd, 433 RTM_ADD, &kr->r) != 0) 434 break; 435 } else 436 kroute_remove(kr); 437 } 438 439 } while ((kr = kn) != NULL); 440 } 441 } 442 443 void 444 kr_fib_update_prio(u_int8_t fib_prio) 445 { 446 struct kroute_node *kr; 447 448 RB_FOREACH(kr, kroute_tree, &krt) 449 if ((kr->r.flags & F_OSPFD_INSERTED)) 450 kr->r.priority = fib_prio; 451 452 log_info("fib priority changed from %hhu to %hhu", 453 kr_state.fib_prio, fib_prio); 454 455 kr_state.fib_prio = fib_prio; 456 } 457 458 void 459 kr_dispatch_msg(int fd, short event, void *bula) 460 { 461 /* XXX this is stupid */ 462 if (dispatch_rtmsg() == -1) 463 event_loopexit(NULL); 464 } 465 466 void 467 kr_show_route(struct imsg *imsg) 468 { 469 struct kroute_node *kr; 470 struct kroute_node *kn; 471 int flags; 472 struct in_addr addr; 473 474 switch (imsg->hdr.type) { 475 case IMSG_CTL_KROUTE: 476 if (imsg->hdr.len != IMSG_HEADER_SIZE + sizeof(flags)) { 477 log_warnx("kr_show_route: wrong imsg len"); 478 return; 479 } 480 memcpy(&flags, imsg->data, sizeof(flags)); 481 RB_FOREACH(kr, kroute_tree, &krt) 482 if (!flags || kr->r.flags & flags) { 483 kn = kr; 484 do { 485 main_imsg_compose_ospfe(IMSG_CTL_KROUTE, 486 imsg->hdr.pid, 487 &kn->r, sizeof(kn->r)); 488 } while ((kn = kn->next) != NULL); 489 } 490 break; 491 case IMSG_CTL_KROUTE_ADDR: 492 if (imsg->hdr.len != IMSG_HEADER_SIZE + 493 sizeof(struct in_addr)) { 494 log_warnx("kr_show_route: wrong imsg len"); 495 return; 496 } 497 memcpy(&addr, imsg->data, sizeof(addr)); 498 kr = NULL; 499 kr = kroute_match(addr.s_addr); 500 if (kr != NULL) 501 main_imsg_compose_ospfe(IMSG_CTL_KROUTE, imsg->hdr.pid, 502 &kr->r, sizeof(kr->r)); 503 break; 504 default: 505 log_debug("kr_show_route: error handling imsg"); 506 break; 507 } 508 509 main_imsg_compose_ospfe(IMSG_CTL_END, imsg->hdr.pid, NULL, 0); 510 } 511 512 void 513 kr_ifinfo(char *ifname, pid_t pid) 514 { 515 struct kif_node *kif; 516 517 RB_FOREACH(kif, kif_tree, &kit) 518 if (ifname == NULL || !strcmp(ifname, kif->k.ifname)) { 519 main_imsg_compose_ospfe(IMSG_CTL_IFINFO, 520 pid, &kif->k, sizeof(kif->k)); 521 } 522 523 main_imsg_compose_ospfe(IMSG_CTL_END, pid, NULL, 0); 524 } 525 526 void 527 kr_redist_remove(struct kroute_node *kh, struct kroute_node *kn) 528 { 529 struct kroute *kr; 530 531 /* was the route redistributed? */ 532 if ((kn->r.flags & F_REDISTRIBUTED) == 0) 533 return; 534 535 /* remove redistributed flag */ 536 kn->r.flags &= ~F_REDISTRIBUTED; 537 kr = &kn->r; 538 539 /* probably inform the RDE (check if no other path is redistributed) */ 540 for (kn = kh; kn; kn = kn->next) 541 if (kn->r.flags & F_REDISTRIBUTED) 542 break; 543 544 if (kn == NULL) 545 main_imsg_compose_rde(IMSG_NETWORK_DEL, 0, kr, 546 sizeof(struct kroute)); 547 } 548 549 int 550 kr_redist_eval(struct kroute *kr, struct kroute *new_kr) 551 { 552 u_int32_t a, metric = 0; 553 554 /* Only non-ospfd routes are considered for redistribution. */ 555 if (!(kr->flags & F_KERNEL)) 556 goto dont_redistribute; 557 558 /* Dynamic routes are not redistributable. */ 559 if (kr->flags & F_DYNAMIC) 560 goto dont_redistribute; 561 562 /* interface is not up and running so don't announce */ 563 if (kr->flags & F_DOWN) 564 goto dont_redistribute; 565 566 /* 567 * We consider the loopback net and multicast addresses 568 * as not redistributable. 569 */ 570 a = ntohl(kr->prefix.s_addr); 571 if (IN_MULTICAST(a) || (a >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 572 goto dont_redistribute; 573 /* 574 * Consider networks with nexthop loopback as not redistributable 575 * unless it is a reject or blackhole route. 576 */ 577 if (kr->nexthop.s_addr == htonl(INADDR_LOOPBACK) && 578 !(kr->flags & (F_BLACKHOLE|F_REJECT))) 579 goto dont_redistribute; 580 581 /* Should we redistribute this route? */ 582 if (!ospf_redistribute(kr, &metric)) 583 goto dont_redistribute; 584 585 /* prefix should be redistributed */ 586 kr->flags |= F_REDISTRIBUTED; 587 /* 588 * only one of all multipath routes can be redistributed so 589 * redistribute the best one. 590 */ 591 if (new_kr->metric > metric) { 592 *new_kr = *kr; 593 new_kr->metric = metric; 594 } 595 596 return (1); 597 598 dont_redistribute: 599 /* was the route redistributed? */ 600 if ((kr->flags & F_REDISTRIBUTED) == 0) 601 return (0); 602 603 kr->flags &= ~F_REDISTRIBUTED; 604 return (1); 605 } 606 607 void 608 kr_redistribute(struct kroute_node *kh) 609 { 610 struct kroute_node *kn; 611 struct kroute kr; 612 int redistribute = 0; 613 614 /* only the highest prio route can be redistributed */ 615 if (kroute_find(kh->r.prefix.s_addr, kh->r.prefixlen, RTP_ANY) != kh) 616 return; 617 618 bzero(&kr, sizeof(kr)); 619 kr.metric = UINT_MAX; 620 for (kn = kh; kn; kn = kn->next) 621 if (kr_redist_eval(&kn->r, &kr)) 622 redistribute = 1; 623 624 if (!redistribute) 625 return; 626 627 if (kr.flags & F_REDISTRIBUTED) { 628 main_imsg_compose_rde(IMSG_NETWORK_ADD, 0, &kr, 629 sizeof(struct kroute)); 630 } else { 631 kr = kh->r; 632 main_imsg_compose_rde(IMSG_NETWORK_DEL, 0, &kr, 633 sizeof(struct kroute)); 634 } 635 } 636 637 void 638 kr_reload(int redis_label_or_prefix) 639 { 640 struct kroute_node *kr, *kn; 641 u_int32_t dummy; 642 int r; 643 int filter_prio = kr_state.fib_prio; 644 645 /* update the priority filter */ 646 if (redis_label_or_prefix) { 647 filter_prio = 0; 648 log_info("%s: priority filter disabled", __func__); 649 } else 650 log_debug("%s: priority filter enabled", __func__); 651 652 if (setsockopt(kr_state.fd, AF_ROUTE, ROUTE_PRIOFILTER, &filter_prio, 653 sizeof(filter_prio)) == -1) { 654 log_warn("%s: setsockopt AF_ROUTE ROUTE_PRIOFILTER", __func__); 655 /* not fatal */ 656 } 657 658 /* update redistribute lists */ 659 RB_FOREACH(kr, kroute_tree, &krt) { 660 for (kn = kr; kn; kn = kn->next) { 661 r = ospf_redistribute(&kn->r, &dummy); 662 /* 663 * if it is redistributed, redistribute again metric 664 * may have changed. 665 */ 666 if ((kn->r.flags & F_REDISTRIBUTED && !r) || r) 667 break; 668 } 669 if (kn) { 670 /* 671 * kr_redistribute copes with removes and RDE with 672 * duplicates 673 */ 674 kr_redistribute(kr); 675 } 676 } 677 } 678 679 /* rb-tree compare */ 680 int 681 kroute_compare(struct kroute_node *a, struct kroute_node *b) 682 { 683 if (ntohl(a->r.prefix.s_addr) < ntohl(b->r.prefix.s_addr)) 684 return (-1); 685 if (ntohl(a->r.prefix.s_addr) > ntohl(b->r.prefix.s_addr)) 686 return (1); 687 if (a->r.prefixlen < b->r.prefixlen) 688 return (-1); 689 if (a->r.prefixlen > b->r.prefixlen) 690 return (1); 691 692 /* if the priority is RTP_ANY finish on the first address hit */ 693 if (a->r.priority == RTP_ANY || b->r.priority == RTP_ANY) 694 return (0); 695 if (a->r.priority < b->r.priority) 696 return (-1); 697 if (a->r.priority > b->r.priority) 698 return (1); 699 return (0); 700 } 701 702 int 703 kif_compare(struct kif_node *a, struct kif_node *b) 704 { 705 return (b->k.ifindex - a->k.ifindex); 706 } 707 708 /* tree management */ 709 struct kroute_node * 710 kroute_find(in_addr_t prefix, u_int8_t prefixlen, u_int8_t prio) 711 { 712 struct kroute_node s; 713 struct kroute_node *kn, *tmp; 714 715 s.r.prefix.s_addr = prefix; 716 s.r.prefixlen = prefixlen; 717 s.r.priority = prio; 718 719 kn = RB_FIND(kroute_tree, &krt, &s); 720 if (kn && prio == RTP_ANY) { 721 tmp = RB_PREV(kroute_tree, &krt, kn); 722 while (tmp) { 723 if (kroute_compare(&s, tmp) == 0) 724 kn = tmp; 725 else 726 break; 727 tmp = RB_PREV(kroute_tree, &krt, kn); 728 } 729 } 730 return (kn); 731 } 732 733 struct kroute_node * 734 kroute_matchgw(struct kroute_node *kr, struct in_addr nh) 735 { 736 in_addr_t nexthop; 737 738 nexthop = nh.s_addr; 739 740 while (kr) { 741 if (kr->r.nexthop.s_addr == nexthop) 742 return (kr); 743 kr = kr->next; 744 } 745 746 return (NULL); 747 } 748 749 int 750 kroute_insert(struct kroute_node *kr) 751 { 752 struct kroute_node *krm, *krh; 753 754 kr->serial = kr_state.fib_serial; 755 756 if ((krh = RB_INSERT(kroute_tree, &krt, kr)) != NULL) { 757 /* 758 * Multipath route, add at end of list. 759 */ 760 krm = krh; 761 while (krm->next != NULL) 762 krm = krm->next; 763 krm->next = kr; 764 kr->next = NULL; /* to be sure */ 765 } else 766 krh = kr; 767 768 if (!(kr->r.flags & F_KERNEL)) { 769 /* don't validate or redistribute ospf route */ 770 kr->r.flags &= ~F_DOWN; 771 return (0); 772 } 773 774 if (kif_validate(kr->r.ifindex)) 775 kr->r.flags &= ~F_DOWN; 776 else 777 kr->r.flags |= F_DOWN; 778 779 kr_redistribute(krh); 780 return (0); 781 } 782 783 int 784 kroute_remove(struct kroute_node *kr) 785 { 786 struct kroute_node *krm; 787 788 if ((krm = RB_FIND(kroute_tree, &krt, kr)) == NULL) { 789 log_warnx("kroute_remove failed to find %s/%u", 790 inet_ntoa(kr->r.prefix), kr->r.prefixlen); 791 return (-1); 792 } 793 794 if (krm == kr) { 795 /* head element */ 796 if (RB_REMOVE(kroute_tree, &krt, kr) == NULL) { 797 log_warnx("kroute_remove failed for %s/%u", 798 inet_ntoa(kr->r.prefix), kr->r.prefixlen); 799 return (-1); 800 } 801 if (kr->next != NULL) { 802 if (RB_INSERT(kroute_tree, &krt, kr->next) != NULL) { 803 log_warnx("kroute_remove failed to add %s/%u", 804 inet_ntoa(kr->r.prefix), kr->r.prefixlen); 805 return (-1); 806 } 807 } 808 } else { 809 /* somewhere in the list */ 810 while (krm->next != kr && krm->next != NULL) 811 krm = krm->next; 812 if (krm->next == NULL) { 813 log_warnx("kroute_remove multipath list corrupted " 814 "for %s/%u", inet_ntoa(kr->r.prefix), 815 kr->r.prefixlen); 816 return (-1); 817 } 818 krm->next = kr->next; 819 } 820 821 kr_redist_remove(krm, kr); 822 rtlabel_unref(kr->r.rtlabel); 823 824 free(kr); 825 return (0); 826 } 827 828 void 829 kroute_clear(void) 830 { 831 struct kroute_node *kr; 832 833 while ((kr = RB_MIN(kroute_tree, &krt)) != NULL) 834 kroute_remove(kr); 835 } 836 837 struct kif_node * 838 kif_find(u_short ifindex) 839 { 840 struct kif_node s; 841 842 bzero(&s, sizeof(s)); 843 s.k.ifindex = ifindex; 844 845 return (RB_FIND(kif_tree, &kit, &s)); 846 } 847 848 struct kif * 849 kif_findname(char *ifname, struct in_addr addr, struct kif_addr **kap) 850 { 851 struct kif_node *kif; 852 struct kif_addr *ka; 853 854 RB_FOREACH(kif, kif_tree, &kit) 855 if (!strcmp(ifname, kif->k.ifname)) { 856 ka = TAILQ_FIRST(&kif->addrs); 857 if (addr.s_addr != 0) { 858 TAILQ_FOREACH(ka, &kif->addrs, entry) { 859 if (addr.s_addr == ka->addr.s_addr) 860 break; 861 } 862 } 863 if (kap != NULL) 864 *kap = ka; 865 return (&kif->k); 866 } 867 868 return (NULL); 869 } 870 871 struct kif_node * 872 kif_insert(u_short ifindex) 873 { 874 struct kif_node *kif; 875 876 if ((kif = calloc(1, sizeof(struct kif_node))) == NULL) 877 return (NULL); 878 879 kif->k.ifindex = ifindex; 880 TAILQ_INIT(&kif->addrs); 881 882 if (RB_INSERT(kif_tree, &kit, kif) != NULL) 883 fatalx("kif_insert: RB_INSERT"); 884 885 return (kif); 886 } 887 888 int 889 kif_remove(struct kif_node *kif) 890 { 891 struct kif_addr *ka; 892 893 if (RB_REMOVE(kif_tree, &kit, kif) == NULL) { 894 log_warnx("RB_REMOVE(kif_tree, &kit, kif)"); 895 return (-1); 896 } 897 898 while ((ka = TAILQ_FIRST(&kif->addrs)) != NULL) { 899 TAILQ_REMOVE(&kif->addrs, ka, entry); 900 free(ka); 901 } 902 free(kif); 903 return (0); 904 } 905 906 void 907 kif_clear(void) 908 { 909 struct kif_node *kif; 910 911 while ((kif = RB_MIN(kif_tree, &kit)) != NULL) 912 kif_remove(kif); 913 } 914 915 struct kif * 916 kif_update(u_short ifindex, int flags, struct if_data *ifd, 917 struct sockaddr_dl *sdl) 918 { 919 struct kif_node *kif; 920 921 if ((kif = kif_find(ifindex)) == NULL) { 922 if ((kif = kif_insert(ifindex)) == NULL) 923 return (NULL); 924 kif->k.nh_reachable = (flags & IFF_UP) && 925 LINK_STATE_IS_UP(ifd->ifi_link_state); 926 } 927 928 kif->k.flags = flags; 929 kif->k.link_state = ifd->ifi_link_state; 930 kif->k.if_type = ifd->ifi_type; 931 kif->k.baudrate = ifd->ifi_baudrate; 932 kif->k.mtu = ifd->ifi_mtu; 933 kif->k.rdomain = ifd->ifi_rdomain; 934 935 if (sdl && sdl->sdl_family == AF_LINK) { 936 if (sdl->sdl_nlen >= sizeof(kif->k.ifname)) 937 memcpy(kif->k.ifname, sdl->sdl_data, 938 sizeof(kif->k.ifname) - 1); 939 else if (sdl->sdl_nlen > 0) 940 memcpy(kif->k.ifname, sdl->sdl_data, 941 sdl->sdl_nlen); 942 /* string already terminated via calloc() */ 943 } 944 945 return (&kif->k); 946 } 947 948 int 949 kif_validate(u_short ifindex) 950 { 951 struct kif_node *kif; 952 953 if ((kif = kif_find(ifindex)) == NULL) { 954 log_warnx("interface with index %u not found", ifindex); 955 return (1); 956 } 957 958 return (kif->k.nh_reachable); 959 } 960 961 struct kroute_node * 962 kroute_match(in_addr_t key) 963 { 964 int i; 965 struct kroute_node *kr; 966 967 /* we will never match the default route */ 968 for (i = 32; i > 0; i--) 969 if ((kr = kroute_find(key & prefixlen2mask(i), i, 970 RTP_ANY)) != NULL) 971 return (kr); 972 973 /* if we don't have a match yet, try to find a default route */ 974 if ((kr = kroute_find(0, 0, RTP_ANY)) != NULL) 975 return (kr); 976 977 return (NULL); 978 } 979 980 /* misc */ 981 int 982 protect_lo(void) 983 { 984 struct kroute_node *kr; 985 986 /* special protection for 127/8 */ 987 if ((kr = calloc(1, sizeof(struct kroute_node))) == NULL) { 988 log_warn("protect_lo"); 989 return (-1); 990 } 991 kr->r.prefix.s_addr = htonl(INADDR_LOOPBACK & IN_CLASSA_NET); 992 kr->r.prefixlen = 8; 993 kr->r.flags = F_KERNEL|F_CONNECTED; 994 995 if (RB_INSERT(kroute_tree, &krt, kr) != NULL) 996 free(kr); /* kernel route already there, no problem */ 997 998 return (0); 999 } 1000 1001 u_int8_t 1002 prefixlen_classful(in_addr_t ina) 1003 { 1004 /* it hurt to write this. */ 1005 1006 if (ina >= 0xf0000000U) /* class E */ 1007 return (32); 1008 else if (ina >= 0xe0000000U) /* class D */ 1009 return (4); 1010 else if (ina >= 0xc0000000U) /* class C */ 1011 return (24); 1012 else if (ina >= 0x80000000U) /* class B */ 1013 return (16); 1014 else /* class A */ 1015 return (8); 1016 } 1017 1018 u_int8_t 1019 mask2prefixlen(in_addr_t ina) 1020 { 1021 if (ina == 0) 1022 return (0); 1023 else 1024 return (33 - ffs(ntohl(ina))); 1025 } 1026 1027 in_addr_t 1028 prefixlen2mask(u_int8_t prefixlen) 1029 { 1030 if (prefixlen == 0) 1031 return (0); 1032 1033 return (htonl(0xffffffff << (32 - prefixlen))); 1034 } 1035 1036 #define ROUNDUP(a) \ 1037 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 1038 1039 void 1040 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) 1041 { 1042 int i; 1043 1044 for (i = 0; i < RTAX_MAX; i++) { 1045 if (addrs & (1 << i)) { 1046 rti_info[i] = sa; 1047 sa = (struct sockaddr *)((char *)(sa) + 1048 ROUNDUP(sa->sa_len)); 1049 } else 1050 rti_info[i] = NULL; 1051 } 1052 } 1053 1054 void 1055 if_change(u_short ifindex, int flags, struct if_data *ifd, 1056 struct sockaddr_dl *sdl) 1057 { 1058 struct kroute_node *kr, *tkr; 1059 struct kif *kif; 1060 u_int8_t reachable; 1061 1062 if ((kif = kif_update(ifindex, flags, ifd, sdl)) == NULL) { 1063 log_warn("if_change: kif_update(%u)", ifindex); 1064 return; 1065 } 1066 1067 /* notify ospfe about interface link state */ 1068 main_imsg_compose_ospfe(IMSG_IFINFO, 0, kif, sizeof(struct kif)); 1069 1070 reachable = (kif->flags & IFF_UP) && 1071 LINK_STATE_IS_UP(kif->link_state); 1072 1073 if (reachable == kif->nh_reachable) 1074 return; /* nothing changed wrt nexthop validity */ 1075 1076 kif->nh_reachable = reachable; 1077 1078 /* update redistribute list */ 1079 RB_FOREACH(kr, kroute_tree, &krt) { 1080 for (tkr = kr; tkr != NULL; tkr = tkr->next) { 1081 if (tkr->r.ifindex == ifindex) { 1082 if (reachable) 1083 tkr->r.flags &= ~F_DOWN; 1084 else 1085 tkr->r.flags |= F_DOWN; 1086 1087 } 1088 } 1089 kr_redistribute(kr); 1090 } 1091 } 1092 1093 void 1094 if_newaddr(u_short ifindex, struct sockaddr_in *ifa, struct sockaddr_in *mask, 1095 struct sockaddr_in *brd) 1096 { 1097 struct kif_node *kif; 1098 struct kif_addr *ka; 1099 struct ifaddrchange ifn; 1100 1101 if (ifa == NULL || ifa->sin_family != AF_INET) 1102 return; 1103 if ((kif = kif_find(ifindex)) == NULL) { 1104 log_warnx("if_newaddr: corresponding if %d not found", ifindex); 1105 return; 1106 } 1107 if ((ka = calloc(1, sizeof(struct kif_addr))) == NULL) 1108 fatal("if_newaddr"); 1109 ka->addr = ifa->sin_addr; 1110 if (mask) 1111 ka->mask = mask->sin_addr; 1112 else 1113 ka->mask.s_addr = INADDR_NONE; 1114 if (brd) 1115 ka->dstbrd = brd->sin_addr; 1116 else 1117 ka->dstbrd.s_addr = INADDR_NONE; 1118 1119 TAILQ_INSERT_TAIL(&kif->addrs, ka, entry); 1120 1121 ifn.addr = ka->addr; 1122 ifn.mask = ka->mask; 1123 ifn.dst = ka->dstbrd; 1124 ifn.ifindex = ifindex; 1125 main_imsg_compose_ospfe(IMSG_IFADDRADD, 0, &ifn, sizeof(ifn)); 1126 } 1127 1128 void 1129 if_deladdr(u_short ifindex, struct sockaddr_in *ifa, struct sockaddr_in *mask, 1130 struct sockaddr_in *brd) 1131 { 1132 struct kif_node *kif; 1133 struct kif_addr *ka, *nka; 1134 struct ifaddrchange ifc; 1135 1136 if (ifa == NULL || ifa->sin_family != AF_INET) 1137 return; 1138 if ((kif = kif_find(ifindex)) == NULL) { 1139 log_warnx("if_deladdr: corresponding if %d not found", ifindex); 1140 return; 1141 } 1142 1143 for (ka = TAILQ_FIRST(&kif->addrs); ka != NULL; ka = nka) { 1144 nka = TAILQ_NEXT(ka, entry); 1145 1146 if (ka->addr.s_addr == ifa->sin_addr.s_addr) { 1147 TAILQ_REMOVE(&kif->addrs, ka, entry); 1148 ifc.addr = ifa->sin_addr; 1149 ifc.ifindex = ifindex; 1150 main_imsg_compose_ospfe(IMSG_IFADDRDEL, 0, &ifc, 1151 sizeof(ifc)); 1152 free(ka); 1153 return; 1154 } 1155 } 1156 } 1157 1158 void 1159 if_announce(void *msg) 1160 { 1161 struct if_announcemsghdr *ifan; 1162 struct kif_node *kif; 1163 1164 ifan = msg; 1165 1166 switch (ifan->ifan_what) { 1167 case IFAN_ARRIVAL: 1168 kif = kif_insert(ifan->ifan_index); 1169 strlcpy(kif->k.ifname, ifan->ifan_name, sizeof(kif->k.ifname)); 1170 break; 1171 case IFAN_DEPARTURE: 1172 kif = kif_find(ifan->ifan_index); 1173 kif_remove(kif); 1174 break; 1175 } 1176 } 1177 1178 /* rtsock */ 1179 int 1180 send_rtmsg(int fd, int action, struct kroute *kroute) 1181 { 1182 struct iovec iov[5]; 1183 struct rt_msghdr hdr; 1184 struct sockaddr_in prefix; 1185 struct sockaddr_in nexthop; 1186 struct sockaddr_in mask; 1187 struct sockaddr_rtlabel sa_rl; 1188 int iovcnt = 0; 1189 const char *label; 1190 1191 if (kr_state.fib_sync == 0) 1192 return (0); 1193 1194 /* initialize header */ 1195 bzero(&hdr, sizeof(hdr)); 1196 hdr.rtm_version = RTM_VERSION; 1197 hdr.rtm_type = action; 1198 hdr.rtm_priority = kr_state.fib_prio; 1199 hdr.rtm_tableid = kr_state.rdomain; /* rtableid */ 1200 if (action == RTM_CHANGE) 1201 hdr.rtm_fmask = RTF_REJECT|RTF_BLACKHOLE; 1202 else 1203 hdr.rtm_flags = RTF_MPATH; 1204 hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */ 1205 hdr.rtm_msglen = sizeof(hdr); 1206 /* adjust iovec */ 1207 iov[iovcnt].iov_base = &hdr; 1208 iov[iovcnt++].iov_len = sizeof(hdr); 1209 1210 bzero(&prefix, sizeof(prefix)); 1211 prefix.sin_len = sizeof(prefix); 1212 prefix.sin_family = AF_INET; 1213 prefix.sin_addr.s_addr = kroute->prefix.s_addr; 1214 /* adjust header */ 1215 hdr.rtm_addrs |= RTA_DST; 1216 hdr.rtm_msglen += sizeof(prefix); 1217 /* adjust iovec */ 1218 iov[iovcnt].iov_base = &prefix; 1219 iov[iovcnt++].iov_len = sizeof(prefix); 1220 1221 if (kroute->nexthop.s_addr != 0) { 1222 bzero(&nexthop, sizeof(nexthop)); 1223 nexthop.sin_len = sizeof(nexthop); 1224 nexthop.sin_family = AF_INET; 1225 nexthop.sin_addr.s_addr = kroute->nexthop.s_addr; 1226 /* adjust header */ 1227 hdr.rtm_flags |= RTF_GATEWAY; 1228 hdr.rtm_addrs |= RTA_GATEWAY; 1229 hdr.rtm_msglen += sizeof(nexthop); 1230 /* adjust iovec */ 1231 iov[iovcnt].iov_base = &nexthop; 1232 iov[iovcnt++].iov_len = sizeof(nexthop); 1233 } 1234 1235 bzero(&mask, sizeof(mask)); 1236 mask.sin_len = sizeof(mask); 1237 mask.sin_family = AF_INET; 1238 mask.sin_addr.s_addr = prefixlen2mask(kroute->prefixlen); 1239 /* adjust header */ 1240 hdr.rtm_addrs |= RTA_NETMASK; 1241 hdr.rtm_msglen += sizeof(mask); 1242 /* adjust iovec */ 1243 iov[iovcnt].iov_base = &mask; 1244 iov[iovcnt++].iov_len = sizeof(mask); 1245 1246 if (kroute->rtlabel != 0) { 1247 sa_rl.sr_len = sizeof(sa_rl); 1248 sa_rl.sr_family = AF_UNSPEC; 1249 label = rtlabel_id2name(kroute->rtlabel); 1250 if (strlcpy(sa_rl.sr_label, label, 1251 sizeof(sa_rl.sr_label)) >= sizeof(sa_rl.sr_label)) { 1252 log_warnx("send_rtmsg: invalid rtlabel"); 1253 return (-1); 1254 } 1255 /* adjust header */ 1256 hdr.rtm_addrs |= RTA_LABEL; 1257 hdr.rtm_msglen += sizeof(sa_rl); 1258 /* adjust iovec */ 1259 iov[iovcnt].iov_base = &sa_rl; 1260 iov[iovcnt++].iov_len = sizeof(sa_rl); 1261 } 1262 1263 retry: 1264 if (writev(fd, iov, iovcnt) == -1) { 1265 if (errno == ESRCH) { 1266 if (hdr.rtm_type == RTM_CHANGE) { 1267 hdr.rtm_type = RTM_ADD; 1268 goto retry; 1269 } else if (hdr.rtm_type == RTM_DELETE) { 1270 log_info("route %s/%u vanished before delete", 1271 inet_ntoa(kroute->prefix), 1272 kroute->prefixlen); 1273 return (0); 1274 } 1275 } 1276 log_warn("send_rtmsg: action %u, prefix %s/%u", hdr.rtm_type, 1277 inet_ntoa(kroute->prefix), kroute->prefixlen); 1278 return (0); 1279 } 1280 1281 return (0); 1282 } 1283 1284 int 1285 fetchtable(void) 1286 { 1287 size_t len; 1288 int mib[7]; 1289 char *buf; 1290 int rv; 1291 1292 mib[0] = CTL_NET; 1293 mib[1] = PF_ROUTE; 1294 mib[2] = 0; 1295 mib[3] = AF_INET; 1296 mib[4] = NET_RT_DUMP; 1297 mib[5] = 0; 1298 mib[6] = kr_state.rdomain; /* rtableid */ 1299 1300 if (sysctl(mib, 7, NULL, &len, NULL, 0) == -1) { 1301 log_warn("sysctl"); 1302 return (-1); 1303 } 1304 if ((buf = malloc(len)) == NULL) { 1305 log_warn("fetchtable"); 1306 return (-1); 1307 } 1308 if (sysctl(mib, 7, buf, &len, NULL, 0) == -1) { 1309 log_warn("sysctl"); 1310 free(buf); 1311 return (-1); 1312 } 1313 1314 rv = rtmsg_process(buf, len); 1315 free(buf); 1316 1317 return (rv); 1318 } 1319 1320 int 1321 fetchifs(u_short ifindex) 1322 { 1323 size_t len; 1324 int mib[6]; 1325 char *buf; 1326 int rv; 1327 1328 mib[0] = CTL_NET; 1329 mib[1] = PF_ROUTE; 1330 mib[2] = 0; 1331 mib[3] = AF_INET; 1332 mib[4] = NET_RT_IFLIST; 1333 mib[5] = ifindex; 1334 1335 if (sysctl(mib, 6, NULL, &len, NULL, 0) == -1) { 1336 log_warn("sysctl"); 1337 return (-1); 1338 } 1339 if ((buf = malloc(len)) == NULL) { 1340 log_warn("fetchif"); 1341 return (-1); 1342 } 1343 if (sysctl(mib, 6, buf, &len, NULL, 0) == -1) { 1344 log_warn("sysctl"); 1345 free(buf); 1346 return (-1); 1347 } 1348 1349 rv = rtmsg_process(buf, len); 1350 free(buf); 1351 1352 return (rv); 1353 } 1354 1355 int 1356 dispatch_rtmsg(void) 1357 { 1358 char buf[RT_BUF_SIZE]; 1359 ssize_t n; 1360 1361 if ((n = read(kr_state.fd, &buf, sizeof(buf))) == -1) { 1362 if (errno == EAGAIN || errno == EINTR) 1363 return (0); 1364 log_warn("dispatch_rtmsg: read error"); 1365 return (-1); 1366 } 1367 1368 if (n == 0) { 1369 log_warnx("routing socket closed"); 1370 return (-1); 1371 } 1372 1373 return (rtmsg_process(buf, n)); 1374 } 1375 1376 int 1377 rtmsg_process(char *buf, size_t len) 1378 { 1379 struct rt_msghdr *rtm; 1380 struct if_msghdr ifm; 1381 struct ifa_msghdr *ifam; 1382 struct sockaddr *sa, *rti_info[RTAX_MAX]; 1383 struct sockaddr_in *sa_in; 1384 struct sockaddr_rtlabel *label; 1385 struct kroute_node *kr, *okr; 1386 struct in_addr prefix, nexthop; 1387 u_int8_t prefixlen, prio; 1388 int flags, mpath; 1389 u_short ifindex = 0; 1390 int rv, delay; 1391 1392 size_t offset; 1393 char *next; 1394 1395 for (offset = 0; offset < len; offset += rtm->rtm_msglen) { 1396 next = buf + offset; 1397 rtm = (struct rt_msghdr *)next; 1398 if (len < offset + sizeof(u_short) || 1399 len < offset + rtm->rtm_msglen) 1400 fatalx("%s: partial rtm in buffer", __func__); 1401 if (rtm->rtm_version != RTM_VERSION) 1402 continue; 1403 1404 prefix.s_addr = 0; 1405 prefixlen = 0; 1406 nexthop.s_addr = 0; 1407 mpath = 0; 1408 prio = 0; 1409 flags = F_KERNEL; 1410 1411 sa = (struct sockaddr *)(next + rtm->rtm_hdrlen); 1412 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 1413 1414 switch (rtm->rtm_type) { 1415 case RTM_ADD: 1416 case RTM_GET: 1417 case RTM_CHANGE: 1418 case RTM_DELETE: 1419 if (rtm->rtm_errno) /* failed attempts... */ 1420 continue; 1421 1422 if (rtm->rtm_tableid != kr_state.rdomain) 1423 continue; 1424 1425 if (rtm->rtm_type == RTM_GET && 1426 rtm->rtm_pid != kr_state.pid) 1427 continue; 1428 1429 if ((sa = rti_info[RTAX_DST]) == NULL) 1430 continue; 1431 1432 /* Skip ARP/ND cache and broadcast routes. */ 1433 if (rtm->rtm_flags & (RTF_LLINFO|RTF_BROADCAST)) 1434 continue; 1435 1436 if (rtm->rtm_flags & RTF_MPATH) 1437 mpath = 1; 1438 prio = rtm->rtm_priority; 1439 flags = (prio == kr_state.fib_prio) ? 1440 F_OSPFD_INSERTED : F_KERNEL; 1441 1442 switch (sa->sa_family) { 1443 case AF_INET: 1444 prefix.s_addr = 1445 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 1446 sa_in = (struct sockaddr_in *) 1447 rti_info[RTAX_NETMASK]; 1448 if (sa_in != NULL) { 1449 if (sa_in->sin_len != 0) 1450 prefixlen = mask2prefixlen( 1451 sa_in->sin_addr.s_addr); 1452 } else if (rtm->rtm_flags & RTF_HOST) 1453 prefixlen = 32; 1454 else 1455 prefixlen = 1456 prefixlen_classful(prefix.s_addr); 1457 if (rtm->rtm_flags & RTF_STATIC) 1458 flags |= F_STATIC; 1459 if (rtm->rtm_flags & RTF_BLACKHOLE) 1460 flags |= F_BLACKHOLE; 1461 if (rtm->rtm_flags & RTF_REJECT) 1462 flags |= F_REJECT; 1463 if (rtm->rtm_flags & RTF_DYNAMIC) 1464 flags |= F_DYNAMIC; 1465 break; 1466 default: 1467 continue; 1468 } 1469 1470 ifindex = rtm->rtm_index; 1471 if ((sa = rti_info[RTAX_GATEWAY]) != NULL) { 1472 switch (sa->sa_family) { 1473 case AF_INET: 1474 if (rtm->rtm_flags & RTF_CONNECTED) 1475 flags |= F_CONNECTED; 1476 1477 nexthop.s_addr = ((struct 1478 sockaddr_in *)sa)->sin_addr.s_addr; 1479 break; 1480 case AF_LINK: 1481 /* 1482 * Traditional BSD connected routes have 1483 * a gateway of type AF_LINK. 1484 */ 1485 flags |= F_CONNECTED; 1486 break; 1487 } 1488 } 1489 } 1490 1491 switch (rtm->rtm_type) { 1492 case RTM_ADD: 1493 case RTM_GET: 1494 case RTM_CHANGE: 1495 if (nexthop.s_addr == 0 && !(flags & F_CONNECTED)) { 1496 log_warnx("no nexthop for %s/%u", 1497 inet_ntoa(prefix), prefixlen); 1498 continue; 1499 } 1500 1501 if ((okr = kroute_find(prefix.s_addr, prefixlen, prio)) 1502 != NULL) { 1503 /* get the correct route */ 1504 kr = okr; 1505 if ((mpath || prio == kr_state.fib_prio) && 1506 (kr = kroute_matchgw(okr, nexthop)) == 1507 NULL) { 1508 log_warnx("%s: mpath route not found", 1509 __func__); 1510 /* add routes we missed out earlier */ 1511 goto add; 1512 } 1513 1514 if (kr->r.flags & F_REDISTRIBUTED) 1515 flags |= F_REDISTRIBUTED; 1516 kr->r.nexthop.s_addr = nexthop.s_addr; 1517 kr->r.flags = flags; 1518 kr->r.ifindex = ifindex; 1519 1520 rtlabel_unref(kr->r.rtlabel); 1521 kr->r.rtlabel = 0; 1522 kr->r.ext_tag = 0; 1523 if ((label = (struct sockaddr_rtlabel *) 1524 rti_info[RTAX_LABEL]) != NULL) { 1525 kr->r.rtlabel = 1526 rtlabel_name2id(label->sr_label); 1527 kr->r.ext_tag = 1528 rtlabel_id2tag(kr->r.rtlabel); 1529 } 1530 1531 if (kif_validate(kr->r.ifindex)) 1532 kr->r.flags &= ~F_DOWN; 1533 else 1534 kr->r.flags |= F_DOWN; 1535 1536 /* just readd, the RDE will care */ 1537 kr->serial = kr_state.fib_serial; 1538 kr_redistribute(okr); 1539 } else { 1540 add: 1541 if ((kr = calloc(1, 1542 sizeof(struct kroute_node))) == NULL) { 1543 log_warn("%s: calloc", __func__); 1544 return (-1); 1545 } 1546 1547 kr->r.prefix.s_addr = prefix.s_addr; 1548 kr->r.prefixlen = prefixlen; 1549 kr->r.nexthop.s_addr = nexthop.s_addr; 1550 kr->r.flags = flags; 1551 kr->r.ifindex = ifindex; 1552 kr->r.priority = prio; 1553 1554 if (rtm->rtm_priority == kr_state.fib_prio) { 1555 log_warnx("alien OSPF route %s/%d", 1556 inet_ntoa(prefix), prefixlen); 1557 rv = send_rtmsg(kr_state.fd, 1558 RTM_DELETE, &kr->r); 1559 free(kr); 1560 if (rv == -1) 1561 return (-1); 1562 } else { 1563 if ((label = (struct sockaddr_rtlabel *) 1564 rti_info[RTAX_LABEL]) != NULL) { 1565 kr->r.rtlabel = 1566 rtlabel_name2id( 1567 label->sr_label); 1568 kr->r.ext_tag = 1569 rtlabel_id2tag( 1570 kr->r.rtlabel); 1571 } 1572 1573 kroute_insert(kr); 1574 } 1575 } 1576 break; 1577 case RTM_DELETE: 1578 if ((kr = kroute_find(prefix.s_addr, prefixlen, prio)) 1579 == NULL) 1580 continue; 1581 if (!(kr->r.flags & F_KERNEL)) 1582 continue; 1583 /* get the correct route */ 1584 okr = kr; 1585 if (mpath && 1586 (kr = kroute_matchgw(kr, nexthop)) == NULL) { 1587 log_warnx("%s: mpath route not found", 1588 __func__); 1589 return (-1); 1590 } 1591 if (kroute_remove(kr) == -1) 1592 return (-1); 1593 break; 1594 case RTM_IFINFO: 1595 memcpy(&ifm, next, sizeof(ifm)); 1596 if_change(ifm.ifm_index, ifm.ifm_flags, &ifm.ifm_data, 1597 (struct sockaddr_dl *)rti_info[RTAX_IFP]); 1598 break; 1599 case RTM_NEWADDR: 1600 ifam = (struct ifa_msghdr *)rtm; 1601 if ((ifam->ifam_addrs & (RTA_NETMASK | RTA_IFA | 1602 RTA_BRD)) == 0) 1603 break; 1604 1605 if_newaddr(ifam->ifam_index, 1606 (struct sockaddr_in *)rti_info[RTAX_IFA], 1607 (struct sockaddr_in *)rti_info[RTAX_NETMASK], 1608 (struct sockaddr_in *)rti_info[RTAX_BRD]); 1609 break; 1610 case RTM_DELADDR: 1611 ifam = (struct ifa_msghdr *)rtm; 1612 if ((ifam->ifam_addrs & (RTA_NETMASK | RTA_IFA | 1613 RTA_BRD)) == 0) 1614 break; 1615 1616 if_deladdr(ifam->ifam_index, 1617 (struct sockaddr_in *)rti_info[RTAX_IFA], 1618 (struct sockaddr_in *)rti_info[RTAX_NETMASK], 1619 (struct sockaddr_in *)rti_info[RTAX_BRD]); 1620 break; 1621 case RTM_IFANNOUNCE: 1622 if_announce(next); 1623 break; 1624 case RTM_DESYNC: 1625 /* 1626 * We lost some routing packets. Schedule a reload 1627 * of the kernel route/interface information. 1628 */ 1629 if (kr_state.reload_state == KR_RELOAD_IDLE) { 1630 delay = KR_RELOAD_TIMER; 1631 log_info("desync; scheduling fib reload"); 1632 } else { 1633 delay = KR_RELOAD_HOLD_TIMER; 1634 log_debug("desync during KR_RELOAD_%s", 1635 kr_state.reload_state == 1636 KR_RELOAD_FETCH ? "FETCH" : "HOLD"); 1637 } 1638 kr_state.reload_state = KR_RELOAD_FETCH; 1639 kr_fib_reload_arm_timer(delay); 1640 break; 1641 default: 1642 /* ignore for now */ 1643 break; 1644 } 1645 } 1646 1647 return (offset); 1648 } 1649