1 /* $NetBSD: socketops.c,v 1.31 2013/07/27 14:35:41 kefren Exp $ */ 2 3 /* 4 * Copyright (c) 2010 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Mihai Chelaru <kefren@NetBSD.org> 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/stat.h> 34 #include <sys/socket.h> 35 #include <sys/ioctl.h> 36 #include <net/if.h> 37 #include <netinet/in.h> 38 #include <arpa/inet.h> 39 40 #include <assert.h> 41 #include <errno.h> 42 #include <ifaddrs.h> 43 #include <poll.h> 44 #include <signal.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <strings.h> 48 #include <unistd.h> 49 50 #include "conffile.h" 51 #include "fsm.h" 52 #include "ldp.h" 53 #include "ldp_command.h" 54 #include "tlv.h" 55 #include "ldp_peer.h" 56 #include "notifications.h" 57 #include "tlv_stack.h" 58 #include "mpls_interface.h" 59 #include "label.h" 60 #include "mpls_routes.h" 61 #include "ldp_errors.h" 62 #include "socketops.h" 63 64 int ls; /* TCP listening socket on port 646 */ 65 int route_socket; /* used to see when a route is added/deleted */ 66 int command_socket; /* Listening socket for interface command */ 67 int current_msg_id = 0x233; 68 int command_port = LDP_COMMAND_PORT; 69 extern int replay_index; 70 extern struct rt_msg replay_rt[REPLAY_MAX]; 71 extern struct com_sock csockets[MAX_COMMAND_SOCKETS]; 72 73 int ldp_hello_time = LDP_HELLO_TIME; 74 int ldp_keepalive_time = LDP_KEEPALIVE_TIME; 75 int ldp_holddown_time = LDP_HOLDTIME; 76 int no_default_route = 1; 77 int loop_detection = 0; 78 bool may_connect; 79 80 void recv_pdu(int); 81 void send_hello_alarm(int); 82 __dead static void bail_out(int); 83 static void print_info(int); 84 static int bind_socket(int s, int stype); 85 static int set_tos(int); 86 static int socket_reuse_port(int); 87 static int get_local_addr(struct sockaddr_dl *, struct in_addr *); 88 static int is_hello_socket(int); 89 static int is_passive_if(const char *if_name); 90 91 int 92 create_hello_sockets() 93 { 94 struct ip_mreq mcast_addr; 95 int s, joined_groups; 96 struct ifaddrs *ifa, *ifb; 97 uint lastifindex; 98 #ifdef INET6 99 struct ipv6_mreq mcast_addr6; 100 struct sockaddr_in6 *if_sa6; 101 #endif 102 struct hello_socket *hs; 103 104 SLIST_INIT(&hello_socket_head); 105 106 s = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); 107 if (s < 0) 108 return s; 109 debugp("INET4 socket created (%d)\n", s); 110 /* 111 * RFC5036 specifies we should listen to all subnet routers multicast 112 * group 113 */ 114 mcast_addr.imr_multiaddr.s_addr = htonl(INADDR_ALLRTRS_GROUP); 115 116 if (socket_reuse_port(s) < 0) 117 goto chs_error; 118 /* Bind it to port 646 */ 119 if (bind_socket(s, AF_INET) == -1) { 120 warnp("Cannot bind INET hello socket\n"); 121 goto chs_error; 122 } 123 124 /* We don't need to receive back our messages */ 125 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &(u_char){0}, 126 sizeof(u_char)) == -1) { 127 fatalp("INET setsockopt IP_MCAST_LOOP: %s\n", strerror(errno)); 128 goto chs_error; 129 } 130 /* Finally join the group on all interfaces */ 131 if (getifaddrs(&ifa) == -1) { 132 fatalp("Cannot iterate interfaces\n"); 133 return -1; 134 } 135 lastifindex = UINT_MAX; 136 joined_groups = 0; 137 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 138 struct sockaddr_in *if_sa = (struct sockaddr_in *) ifb->ifa_addr; 139 if (if_sa->sin_family != AF_INET || (!(ifb->ifa_flags & IFF_UP)) || 140 (ifb->ifa_flags & IFF_LOOPBACK) || 141 (!(ifb->ifa_flags & IFF_MULTICAST)) || 142 (ntohl(if_sa->sin_addr.s_addr) >> 24 == IN_LOOPBACKNET) || 143 is_passive_if(ifb->ifa_name) || 144 lastifindex == if_nametoindex(ifb->ifa_name)) 145 continue; 146 lastifindex = if_nametoindex(ifb->ifa_name); 147 148 mcast_addr.imr_interface.s_addr = if_sa->sin_addr.s_addr; 149 debugp("Join IPv4 mcast on %s\n", ifb->ifa_name); 150 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *) &mcast_addr, 151 sizeof(mcast_addr)) == -1) { 152 fatalp("setsockopt ADD_MEMBER: %s\n", strerror(errno)); 153 goto chs_error; 154 } 155 joined_groups++; 156 if (joined_groups == IP_MAX_MEMBERSHIPS) { 157 warnp("Maximum group memberships reached for INET socket\n"); 158 break; 159 } 160 } 161 /* TTL:1 for IPv4 */ 162 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &(int){1}, 163 sizeof(int)) == -1) { 164 fatalp("set mcast ttl: %s\n", strerror(errno)); 165 goto chs_error; 166 } 167 /* TOS :0xc0 for IPv4 */ 168 if (set_tos(s) == -1) { 169 fatalp("set_tos: %s", strerror(errno)); 170 goto chs_error; 171 } 172 /* we need to get the input interface for message processing */ 173 if (setsockopt(s, IPPROTO_IP, IP_RECVIF, &(uint32_t){1}, 174 sizeof(uint32_t)) == -1) { 175 fatalp("Cannot set IP_RECVIF\n"); 176 goto chs_error; 177 } 178 179 hs = (struct hello_socket *)malloc(sizeof(*hs)); 180 if (hs == NULL) { 181 fatalp("Cannot alloc hello_socket structure\n"); 182 goto chs_error; 183 } 184 hs->type = AF_INET; 185 hs->socket = s; 186 SLIST_INSERT_HEAD(&hello_socket_head, hs, listentry); 187 188 #ifdef INET6 189 /* 190 * Now we do the same for IPv6 191 */ 192 s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP); 193 if (s < 0) { 194 fatalp("Cannot create INET6 socket\n"); 195 return -1; 196 } 197 debugp("INET6 socket created (%d)\n", s); 198 199 if (socket_reuse_port(s) < 0) 200 goto chs_error; 201 202 if (bind_socket(s, AF_INET6) == -1) { 203 fatalp("Cannot bind INET6 hello socket\n"); 204 goto chs_error; 205 } 206 207 if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, 208 &(uint){0}, sizeof(uint)) == -1) { 209 fatalp("INET6 setsocketopt IP_MCAST_LOOP: %s\n", 210 strerror(errno)); 211 goto chs_error; 212 } 213 214 lastifindex = UINT_MAX; 215 mcast_addr6.ipv6mr_multiaddr = in6addr_linklocal_allrouters; 216 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 217 if_sa6 = (struct sockaddr_in6 *) ifb->ifa_addr; 218 if (if_sa6->sin6_family != AF_INET6 || 219 (!(ifb->ifa_flags & IFF_UP)) || 220 (!(ifb->ifa_flags & IFF_MULTICAST)) || 221 (ifb->ifa_flags & IFF_LOOPBACK) || 222 is_passive_if(ifb->ifa_name) || 223 IN6_IS_ADDR_LOOPBACK(&if_sa6->sin6_addr)) 224 continue; 225 /* 226 * draft-ietf-mpls-ldp-ipv6-07 Section 5.1: 227 * Additionally, the link-local 228 * IPv6 address MUST be used as the source IP address in IPv6 229 * LDP Link Hellos. 230 */ 231 if (IN6_IS_ADDR_LINKLOCAL(&if_sa6->sin6_addr) == 0) 232 continue; 233 /* We should have only one LLADDR per interface, but... */ 234 if (lastifindex == if_nametoindex(ifb->ifa_name)) 235 continue; 236 mcast_addr6.ipv6mr_interface = lastifindex = 237 if_nametoindex(ifb->ifa_name); 238 239 debugp("Join IPv6 mcast on %s\n", ifb->ifa_name); 240 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, 241 (char *)&mcast_addr6, sizeof(mcast_addr6)) == -1) { 242 fatalp("INET6 setsockopt JOIN: %s\n", strerror(errno)); 243 goto chs_error; 244 } 245 } 246 freeifaddrs(ifa); 247 248 /* TTL: 255 for IPv6 - draft-ietf-mpls-ldp-ipv6-07 Section 9 */ 249 if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 250 &(int){255}, sizeof(int)) == -1) { 251 fatalp("set mcast hops: %s\n", strerror(errno)); 252 goto chs_error; 253 } 254 if (setsockopt(s, IPPROTO_IPV6, IPV6_RECVPKTINFO, 255 &(uint32_t){1}, sizeof(uint32_t)) == -1) 256 goto chs_error; 257 258 hs = (struct hello_socket *)malloc(sizeof(*hs)); 259 if (hs == NULL) { 260 fatalp("Memory alloc problem: hs\n"); 261 goto chs_error; 262 } 263 264 hs->type = AF_INET6; 265 hs->socket = s; 266 SLIST_INSERT_HEAD(&hello_socket_head, hs, listentry); 267 #endif 268 return 0; 269 chs_error: 270 close(s); 271 return -1; 272 } 273 274 /* Check if parameter is a hello socket */ 275 int 276 is_hello_socket(int s) 277 { 278 struct hello_socket *hs; 279 280 SLIST_FOREACH(hs, &hello_socket_head, listentry) 281 if (hs->socket == s) 282 return 1; 283 return 0; 284 } 285 286 /* Check if interface is passive */ 287 static int 288 is_passive_if(const char *if_name) 289 { 290 struct passive_if *pif; 291 292 SLIST_FOREACH(pif, &passifs_head, listentry) 293 if (strncasecmp(if_name, pif->if_name, IF_NAMESIZE) == 0) 294 return 1; 295 return 0; 296 } 297 298 /* Sets the TTL to 1 as we don't want to transmit outside this subnet */ 299 int 300 set_ttl(int s) 301 { 302 int ret; 303 if ((ret = setsockopt(s, IPPROTO_IP, IP_TTL, &(int){1}, sizeof(int))) 304 == -1) 305 fatalp("set_ttl: %s", strerror(errno)); 306 return ret; 307 } 308 309 /* Sets TOS to 0xc0 aka IP Precedence 6 */ 310 static int 311 set_tos(int s) 312 { 313 int ret; 314 if ((ret = setsockopt(s, IPPROTO_IP, IP_TOS, &(int){0xc0}, 315 sizeof(int))) == -1) 316 fatalp("set_tos: %s", strerror(errno)); 317 return ret; 318 } 319 320 static int 321 socket_reuse_port(int s) 322 { 323 int ret; 324 if ((ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &(int){1}, 325 sizeof(int))) == -1) 326 fatalp("socket_reuse_port: %s", strerror(errno)); 327 return ret; 328 } 329 330 /* binds an UDP socket */ 331 static int 332 bind_socket(int s, int stype) 333 { 334 union sockunion su; 335 336 assert (stype == AF_INET || stype == AF_INET6); 337 338 if (stype == AF_INET) { 339 su.sin.sin_len = sizeof(su.sin); 340 su.sin.sin_family = AF_INET; 341 su.sin.sin_addr.s_addr = htonl(INADDR_ANY); 342 su.sin.sin_port = htons(LDP_PORT); 343 } 344 #ifdef INET6 345 else if (stype == AF_INET6) { 346 su.sin6.sin6_len = sizeof(su.sin6); 347 su.sin6.sin6_family = AF_INET6; 348 su.sin6.sin6_addr = in6addr_any; 349 su.sin6.sin6_port = htons(LDP_PORT); 350 } 351 #endif 352 if (bind(s, &su.sa, su.sa.sa_len)) { 353 fatalp("bind_socket: %s\n", strerror(errno)); 354 return -1; 355 } 356 return 0; 357 } 358 359 /* Create / bind the TCP socket */ 360 int 361 create_listening_socket(void) 362 { 363 struct sockaddr_in sa; 364 int s; 365 366 sa.sin_len = sizeof(sa); 367 sa.sin_family = AF_INET; 368 sa.sin_port = htons(LDP_PORT); 369 sa.sin_addr.s_addr = htonl(INADDR_ANY); 370 371 s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); 372 if (s < 0) 373 return s; 374 if (bind(s, (struct sockaddr *) & sa, sizeof(sa))) { 375 fatalp("bind: %s", strerror(errno)); 376 close(s); 377 return -1; 378 } 379 if (listen(s, 10) == -1) { 380 fatalp("listen: %s", strerror(errno)); 381 close(s); 382 return -1; 383 } 384 /* if (set_tos(s) == -1) { 385 fatalp("set_tos: %s", strerror(errno)); 386 close(s); 387 return -1; 388 } 389 */ return s; 390 } 391 392 /* 393 * It's ugly. We need a function to pass all tlvs and create pdu but since I 394 * use UDP socket only to send hellos, I didn't bother 395 */ 396 void 397 send_hello(void) 398 { 399 struct hello_tlv *t; 400 struct common_hello_tlv *cht; 401 struct ldp_pdu *spdu; 402 struct transport_address_tlv *trtlv; 403 void *v; 404 struct sockaddr_in sadest; /* Destination ALL_ROUTERS */ 405 ssize_t sb = 0; /* sent bytes */ 406 struct ifaddrs *ifa, *ifb; 407 struct sockaddr_in *if_sa; 408 int ip4socket = -1; 409 uint lastifindex; 410 struct hello_socket *hs; 411 #ifdef INET6 412 struct sockaddr_in6 sadest6; 413 int ip6socket = -1; 414 #endif 415 416 #define BASIC_HELLO_MSG_SIZE (sizeof(struct ldp_pdu) + /* PDU */ \ 417 TLV_TYPE_LENGTH + MSGID_SIZE + /* Hello TLV */ \ 418 /* Common Hello TLV */ \ 419 sizeof(struct common_hello_tlv)) 420 #define GENERAL_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + \ 421 /* Transport Address */ \ 422 sizeof(struct transport_address_tlv) 423 #define IPV4_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + 4 + sizeof(struct in_addr) 424 #define IPV6_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + 4 + sizeof(struct in6_addr) 425 426 if ((v = calloc(1, GENERAL_HELLO_MSG_SIZE)) == NULL) { 427 fatalp("alloc problem in send_hello()\n"); 428 return; 429 } 430 431 spdu = (struct ldp_pdu *)((char *)v); 432 t = (struct hello_tlv *)(spdu + 1); 433 cht = &t->ch; /* Hello tlv struct includes CHT */ 434 trtlv = (struct transport_address_tlv *)(t + 1); 435 436 /* Prepare PDU envelope */ 437 spdu->version = htons(LDP_VERSION); 438 spdu->length = htons(IPV4_HELLO_MSG_SIZE - PDU_VER_LENGTH); 439 inet_aton(LDP_ID, &spdu->ldp_id); 440 441 /* Prepare Hello TLV */ 442 t->type = htons(LDP_HELLO); 443 t->length = htons(MSGID_SIZE + 444 sizeof(struct common_hello_tlv) + 445 IPV4_HELLO_MSG_SIZE - BASIC_HELLO_MSG_SIZE); 446 /* 447 * We used ID 0 instead of htonl(get_message_id()) because we've 448 * seen hellos from Cisco routers doing the same thing 449 */ 450 t->messageid = 0; 451 452 /* Prepare Common Hello attributes */ 453 cht->type = htons(TLV_COMMON_HELLO); 454 cht->length = htons(sizeof(cht->holdtime) + sizeof(cht->res)); 455 cht->holdtime = htons(ldp_holddown_time); 456 cht->res = 0; 457 458 /* 459 * Prepare Transport Address TLV RFC5036 says: "If this optional TLV 460 * is not present the IPv4 source address for the UDP packet carrying 461 * the Hello should be used." But we send it because everybody seems 462 * to do so 463 */ 464 trtlv->type = htons(TLV_IPV4_TRANSPORT); 465 trtlv->length = htons(sizeof(struct in_addr)); 466 /* trtlv->address will be set for each socket */ 467 468 /* Destination sockaddr */ 469 memset(&sadest, 0, sizeof(sadest)); 470 sadest.sin_len = sizeof(sadest); 471 sadest.sin_family = AF_INET; 472 sadest.sin_port = htons(LDP_PORT); 473 sadest.sin_addr.s_addr = htonl(INADDR_ALLRTRS_GROUP); 474 475 /* Find our socket */ 476 SLIST_FOREACH(hs, &hello_socket_head, listentry) 477 if (hs->type == AF_INET) { 478 ip4socket = hs->socket; 479 break; 480 } 481 assert(ip4socket >= 0); 482 483 if (getifaddrs(&ifa) == -1) { 484 free(v); 485 fatalp("Cannot enumerate interfaces\n"); 486 return; 487 } 488 489 lastifindex = UINT_MAX; 490 /* Loop all interfaces in order to send IPv4 hellos */ 491 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 492 if_sa = (struct sockaddr_in *) ifb->ifa_addr; 493 if (if_sa->sin_family != AF_INET || 494 (!(ifb->ifa_flags & IFF_UP)) || 495 (ifb->ifa_flags & IFF_LOOPBACK) || 496 (!(ifb->ifa_flags & IFF_MULTICAST)) || 497 is_passive_if(ifb->ifa_name) || 498 (ntohl(if_sa->sin_addr.s_addr) >> 24 == IN_LOOPBACKNET) || 499 lastifindex == if_nametoindex(ifb->ifa_name)) 500 continue; 501 502 /* Send only once per interface, using primary address */ 503 if (lastifindex == if_nametoindex(ifb->ifa_name)) 504 continue; 505 lastifindex = if_nametoindex(ifb->ifa_name); 506 507 if (setsockopt(ip4socket, IPPROTO_IP, IP_MULTICAST_IF, 508 &if_sa->sin_addr, sizeof(struct in_addr)) == -1) { 509 warnp("setsockopt failed: %s\n", strerror(errno)); 510 continue; 511 } 512 trtlv->address.ip4addr.s_addr = if_sa->sin_addr.s_addr; 513 514 /* Put it on the wire */ 515 sb = sendto(ip4socket, v, IPV4_HELLO_MSG_SIZE, 0, 516 (struct sockaddr *) & sadest, sizeof(sadest)); 517 if (sb < (ssize_t)(IPV4_HELLO_MSG_SIZE)) 518 fatalp("send: %s", strerror(errno)); 519 else 520 debugp("Sent (IPv4) %zd bytes on %s" 521 " (PDU: %d, Hello TLV: %d, CH: %d, TR: %d)\n", 522 sb, ifb->ifa_name, 523 ntohs(spdu->length), ntohs(t->length), 524 ntohs(cht->length), ntohs(trtlv->length)); 525 } 526 #ifdef INET6 527 /* Adjust lengths */ 528 spdu->length = htons(IPV6_HELLO_MSG_SIZE - PDU_VER_LENGTH); 529 t->length = htons(MSGID_SIZE + 530 sizeof(struct common_hello_tlv) + 531 IPV6_HELLO_MSG_SIZE - BASIC_HELLO_MSG_SIZE); 532 trtlv->length = htons(sizeof(struct in6_addr)); 533 trtlv->type = htons(TLV_IPV6_TRANSPORT); 534 535 /* Prepare destination sockaddr */ 536 memset(&sadest6, 0, sizeof(sadest6)); 537 sadest6.sin6_len = sizeof(sadest6); 538 sadest6.sin6_family = AF_INET6; 539 sadest6.sin6_port = htons(LDP_PORT); 540 sadest6.sin6_addr = in6addr_linklocal_allrouters; 541 542 SLIST_FOREACH(hs, &hello_socket_head, listentry) 543 if (hs->type == AF_INET6) { 544 ip6socket = hs->socket; 545 break; 546 } 547 548 lastifindex = UINT_MAX; 549 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 550 struct sockaddr_in6 * if_sa6 = 551 (struct sockaddr_in6 *) ifb->ifa_addr; 552 if (if_sa6->sin6_family != AF_INET6 || 553 (!(ifb->ifa_flags & IFF_UP)) || 554 (!(ifb->ifa_flags & IFF_MULTICAST)) || 555 (ifb->ifa_flags & IFF_LOOPBACK) || 556 is_passive_if(ifb->ifa_name) || 557 IN6_IS_ADDR_LOOPBACK(&if_sa6->sin6_addr)) 558 continue; 559 /* 560 * draft-ietf-mpls-ldp-ipv6-07 Section 5.1: 561 * Additionally, the link-local 562 * IPv6 address MUST be used as the source IP address in IPv6 563 * LDP Link Hellos. 564 */ 565 if (IN6_IS_ADDR_LINKLOCAL(&if_sa6->sin6_addr) == 0) 566 continue; 567 /* We should have only one LLADDR per interface, but... */ 568 if (lastifindex == if_nametoindex(ifb->ifa_name)) 569 continue; 570 lastifindex = if_nametoindex(ifb->ifa_name); 571 572 if (setsockopt(ip6socket, IPPROTO_IPV6, IPV6_MULTICAST_IF, 573 &lastifindex, sizeof(int)) == -1) { 574 fatalp("ssopt6 IPV6_MULTICAST_IF failed: %s for %s\n", 575 strerror(errno), ifb->ifa_name); 576 continue; 577 } 578 579 memcpy(&trtlv->address.ip6addr, &if_sa6->sin6_addr, 580 sizeof(struct in6_addr)); 581 582 /* Put it on the wire */ 583 sb = sendto(ip6socket, v, IPV6_HELLO_MSG_SIZE, 584 0, (struct sockaddr *)&sadest6, sizeof(sadest6)); 585 if (sb < (ssize_t)(IPV6_HELLO_MSG_SIZE)) 586 fatalp("send6: %s", strerror(errno)); 587 else 588 debugp("Sent (IPv6) %zd bytes on %s " 589 "(PDU: %d, Hello TLV: %d, CH: %d TR: %d)\n", 590 sb, ifb->ifa_name, htons(spdu->length), 591 htons(t->length), htons(cht->length), 592 htons(trtlv->length)); 593 } 594 #endif 595 freeifaddrs(ifa); 596 free(v); 597 } 598 599 int 600 get_message_id(void) 601 { 602 current_msg_id++; 603 return current_msg_id; 604 } 605 606 static int 607 get_local_addr(struct sockaddr_dl *sdl, struct in_addr *sin) 608 { 609 struct ifaddrs *ifa, *ifb; 610 struct sockaddr_in *sinet; 611 612 if (sdl == NULL) 613 return -1; 614 615 if (getifaddrs(&ifa) == -1) 616 return -1; 617 for (ifb = ifa; ifb; ifb = ifb->ifa_next) 618 if (ifb->ifa_addr->sa_family == AF_INET) { 619 if (if_nametoindex(ifb->ifa_name) != sdl->sdl_index) 620 continue; 621 sinet = (struct sockaddr_in*) ifb->ifa_addr; 622 sin->s_addr = sinet->sin_addr.s_addr; 623 freeifaddrs(ifa); 624 return 0; 625 } 626 freeifaddrs(ifa); 627 return -1; 628 } 629 630 /* Receive PDUs on Multicast UDP socket */ 631 void 632 recv_pdu(int sock) 633 { 634 struct ldp_pdu rpdu; 635 int c, i; 636 struct msghdr msg; 637 struct iovec iov[1]; 638 unsigned char recvspace[MAX_PDU_SIZE]; 639 struct hello_tlv *t; 640 union sockunion sender; 641 struct sockaddr_dl *sdl = NULL; 642 struct in_addr my_ldp_addr, local_addr; 643 struct cmsghdr *cmptr; 644 union { 645 struct cmsghdr cm; 646 char control[1024]; 647 } control_un; 648 649 memset(&msg, 0, sizeof(msg)); 650 msg.msg_control = control_un.control; 651 msg.msg_controllen = sizeof(control_un.control); 652 msg.msg_flags = 0; 653 msg.msg_name = &sender; 654 msg.msg_namelen = sizeof(sender); 655 iov[0].iov_base = recvspace; 656 iov[0].iov_len = sizeof(recvspace); 657 msg.msg_iov = iov; 658 msg.msg_iovlen = 1; 659 660 c = recvmsg(sock, &msg, MSG_WAITALL); 661 662 /* Check to see if this is larger than MIN_PDU_SIZE */ 663 if (c < MIN_PDU_SIZE) 664 return; 665 666 /* Read the PDU */ 667 i = get_pdu(recvspace, &rpdu); 668 669 debugp("recv_pdu(%d): PDU(size: %d) from: %s\n", sock, 670 c, satos(&sender.sa)); 671 672 /* We currently understand Version 1 */ 673 if (rpdu.version != LDP_VERSION) { 674 warnp("recv_pdu: Version mismatch\n"); 675 return; 676 } 677 678 /* Check if it's our hello */ 679 inet_aton(LDP_ID, &my_ldp_addr); 680 if (rpdu.ldp_id.s_addr == my_ldp_addr.s_addr) { 681 /* It should not be looped. We set MULTICAST_LOOP 0 */ 682 fatalp("Received our PDU. Ignoring it\n"); 683 return; 684 } 685 686 if (msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr) || 687 (msg.msg_flags & MSG_CTRUNC)) 688 local_addr.s_addr = my_ldp_addr.s_addr; 689 else { 690 for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL; 691 cmptr = CMSG_NXTHDR(&msg, cmptr)) 692 if (cmptr->cmsg_level == IPPROTO_IP && 693 cmptr->cmsg_type == IP_RECVIF) { 694 sdl = (struct sockaddr_dl *) CMSG_DATA(cmptr); 695 break; 696 } 697 if (get_local_addr(sdl, &local_addr) != 0) 698 local_addr.s_addr = my_ldp_addr.s_addr; 699 } 700 701 702 debugp("Read %d bytes from address %s Length: %.4d Version: %d\n", 703 c, inet_ntoa(rpdu.ldp_id), rpdu.length, rpdu.version); 704 705 /* Fill the TLV messages */ 706 t = get_hello_tlv(recvspace + i, c - i); 707 run_ldp_hello(&rpdu, t, &sender.sa, &local_addr, sock, may_connect); 708 } 709 710 void 711 send_hello_alarm(int unused) 712 { 713 struct ldp_peer *p, *ptmp; 714 struct hello_info *hi, *hinext; 715 time_t t = time(NULL); 716 int olderrno = errno; 717 718 if (may_connect == false) 719 may_connect = true; 720 /* Send hellos */ 721 if (!(t % ldp_hello_time)) 722 send_hello(); 723 724 /* Timeout -- */ 725 SLIST_FOREACH(p, &ldp_peer_head, peers) 726 p->timeout--; 727 728 /* Check for timeout */ 729 SLIST_FOREACH_SAFE(p, &ldp_peer_head, peers, ptmp) 730 if (p->timeout < 1) 731 switch (p->state) { 732 case LDP_PEER_HOLDDOWN: 733 debugp("LDP holddown expired for peer %s\n", 734 inet_ntoa(p->ldp_id)); 735 ldp_peer_delete(p); 736 break; 737 case LDP_PEER_ESTABLISHED: 738 case LDP_PEER_CONNECTED: 739 send_notification(p, 0, 740 NOTIF_FATAL|NOTIF_KEEP_ALIVE_TIMER_EXPIRED); 741 warnp("Keepalive expired for %s\n", 742 inet_ntoa(p->ldp_id)); 743 ldp_peer_holddown(p); 744 break; 745 } /* switch */ 746 747 /* send keepalives */ 748 if (!(t % ldp_keepalive_time)) { 749 SLIST_FOREACH(p, &ldp_peer_head, peers) 750 if (p->state == LDP_PEER_ESTABLISHED) { 751 debugp("Sending KeepAlive to %s\n", 752 inet_ntoa(p->ldp_id)); 753 keep_alive(p); 754 } 755 } 756 757 /* Decrement and Check hello keepalives */ 758 SLIST_FOREACH_SAFE(hi, &hello_info_head, infos, hinext) { 759 if (hi->keepalive != 0xFFFF) 760 hi->keepalive--; 761 if (hi->keepalive < 1) 762 SLIST_REMOVE(&hello_info_head, hi, hello_info, infos); 763 } 764 765 /* Set the alarm again and bail out */ 766 alarm(1); 767 errno = olderrno; 768 } 769 770 static void 771 bail_out(int x) 772 { 773 ldp_peer_holddown_all(); 774 flush_mpls_routes(); 775 exit(0); 776 } 777 778 static void 779 print_info(int x) 780 { 781 printf("Info for %s\n-------\n", LDP_ID); 782 printf("Neighbours:\n"); 783 show_neighbours(1, NULL); 784 printf("Bindings:\n"); 785 show_bindings(1, NULL); 786 printf("Labels:\n"); 787 show_labels(1, NULL); 788 printf("--------\n"); 789 } 790 791 /* 792 * The big poll that catches every single event 793 * on every socket. 794 */ 795 int 796 the_big_loop(void) 797 { 798 int sock_error; 799 uint32_t i; 800 socklen_t sock_error_size = sizeof(int); 801 struct ldp_peer *p; 802 struct com_sock *cs; 803 struct pollfd pfd[MAX_POLL_FDS]; 804 struct hello_socket *hs; 805 nfds_t pollsum; 806 807 assert(MAX_POLL_FDS > 5); 808 809 SLIST_INIT(&hello_info_head); 810 811 signal(SIGALRM, send_hello_alarm); 812 signal(SIGPIPE, SIG_IGN); 813 signal(SIGINT, bail_out); 814 signal(SIGTERM, bail_out); 815 signal(SIGINFO, print_info); 816 817 /* Send first hellos in 5 seconds. Avoid No hello notifications */ 818 may_connect = false; 819 alarm(5); 820 821 route_socket = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC); 822 setsockopt(route_socket, SOL_SOCKET, SO_USELOOPBACK, &(int){0}, 823 sizeof(int)); 824 825 sock_error = bind_current_routes(); 826 if (sock_error != LDP_E_OK) { 827 fatalp("Cannot get current routes\n"); 828 return sock_error; 829 } 830 831 for (;;) { 832 pfd[0].fd = ls; 833 pfd[0].events = POLLRDNORM; 834 pfd[0].revents = 0; 835 836 pfd[1].fd = route_socket; 837 pfd[1].events = POLLRDNORM; 838 pfd[1].revents = 0; 839 840 pfd[2].fd = command_socket; 841 pfd[2].events = POLLRDNORM; 842 pfd[2].revents = 0; 843 844 /* Hello sockets */ 845 pollsum = 3; 846 SLIST_FOREACH(hs, &hello_socket_head, listentry) { 847 pfd[pollsum].fd = hs->socket; 848 pfd[pollsum].events = POLLIN; 849 pfd[pollsum].revents = 0; 850 pollsum++; 851 } 852 853 /* Command sockets */ 854 for (i=0; i < MAX_COMMAND_SOCKETS; i++) 855 if (csockets[i].socket != -1) { 856 if (pollsum >= MAX_POLL_FDS) 857 break; 858 pfd[pollsum].fd = csockets[i].socket; 859 pfd[pollsum].events = POLLIN; 860 pfd[pollsum].revents = 0; 861 pollsum++; 862 } 863 864 /* LDP Peer sockets */ 865 SLIST_FOREACH(p, &ldp_peer_head, peers) { 866 if (p->socket < 1) 867 continue; 868 switch (p->state) { 869 case LDP_PEER_CONNECTED: 870 case LDP_PEER_ESTABLISHED: 871 if (pollsum >= MAX_POLL_FDS) 872 break; 873 pfd[pollsum].fd = p->socket; 874 pfd[pollsum].events = POLLRDNORM; 875 pfd[pollsum].revents = 0; 876 pollsum++; 877 break; 878 case LDP_PEER_CONNECTING: 879 if (pollsum >= MAX_POLL_FDS) 880 break; 881 pfd[pollsum].fd = p->socket; 882 pfd[pollsum].events = POLLWRNORM; 883 pfd[pollsum].revents = 0; 884 pollsum++; 885 break; 886 } 887 } 888 889 if (pollsum >= MAX_POLL_FDS) { 890 fatalp("Too many sockets. Increase MAX_POLL_FDS\n"); 891 return LDP_E_TOO_MANY_FDS; 892 } 893 if (poll(pfd, pollsum, INFTIM) < 0) { 894 if (errno != EINTR) 895 fatalp("poll: %s", strerror(errno)); 896 continue; 897 } 898 899 for (i = 0; i < pollsum; i++) { 900 if ((pfd[i].revents & POLLRDNORM) || 901 (pfd[i].revents & POLLIN)) { 902 if(pfd[i].fd == ls) 903 new_peer_connection(); 904 else if (pfd[i].fd == route_socket) { 905 struct rt_msg xbuf; 906 int l, rtmlen = sizeof(xbuf); 907 /* Read at least rtm_msglen */ 908 l = recv(route_socket, &xbuf, 909 sizeof(u_short), MSG_PEEK); 910 if (l == sizeof(u_short)) 911 rtmlen = xbuf.m_rtm.rtm_msglen; 912 do { 913 l = recv(route_socket, &xbuf, 914 rtmlen, MSG_WAITALL); 915 } while ((l == -1) && (errno == EINTR)); 916 917 if (l == -1) 918 break; 919 920 check_route(&xbuf, l); 921 922 } else if (is_hello_socket(pfd[i].fd) == 1) { 923 /* Receiving hello socket */ 924 recv_pdu(pfd[i].fd); 925 } else if (pfd[i].fd == command_socket) { 926 command_accept(command_socket); 927 } else if ((cs = is_command_socket(pfd[i].fd)) 928 != NULL) { 929 command_dispatch(cs); 930 } else { 931 /* ldp peer socket */ 932 p = get_ldp_peer_by_socket(pfd[i].fd); 933 if (p) 934 recv_session_pdu(p); 935 } 936 } else if(pfd[i].revents & POLLWRNORM) { 937 p = get_ldp_peer_by_socket(pfd[i].fd); 938 if (!p) 939 continue; 940 assert(p->state == LDP_PEER_CONNECTING); 941 if (getsockopt(pfd[i].fd, SOL_SOCKET, SO_ERROR, 942 &sock_error, &sock_error_size) != 0 || 943 sock_error != 0) { 944 ldp_peer_holddown(p); 945 sock_error = 0; 946 } else { 947 p->state = LDP_PEER_CONNECTED; 948 send_initialize(p); 949 } 950 } 951 } 952 953 for (int ri = 0; ri < replay_index; ri++) { 954 debugp("Replaying: PID %d, SEQ %d\n", 955 replay_rt[ri].m_rtm.rtm_pid, 956 replay_rt[ri].m_rtm.rtm_seq); 957 check_route(&replay_rt[ri], sizeof(struct rt_msg)); 958 } 959 replay_index = 0; 960 } /* for (;;) */ 961 } 962 963 void 964 new_peer_connection() 965 { 966 union sockunion peer_address, my_address; 967 struct in_addr *peer_ldp_id = NULL; 968 struct hello_info *hi; 969 int s; 970 971 s = accept(ls, &peer_address.sa, 972 & (socklen_t) { sizeof(union sockunion) } ); 973 if (s < 0) { 974 fatalp("accept: %s", strerror(errno)); 975 return; 976 } 977 978 if (getsockname(s, &my_address.sa, 979 & (socklen_t) { sizeof(union sockunion) } )) { 980 fatalp("new_peer_connection(): cannot getsockname\n"); 981 close(s); 982 return; 983 } 984 985 if (peer_address.sa.sa_family == AF_INET) 986 peer_address.sin.sin_port = 0; 987 else if (peer_address.sa.sa_family == AF_INET6) 988 peer_address.sin6.sin6_port = 0; 989 else { 990 fatalp("Unknown peer address family\n"); 991 close(s); 992 return; 993 } 994 995 /* Already peered or in holddown ? */ 996 if (get_ldp_peer(&peer_address.sa) != NULL) { 997 close(s); 998 return; 999 } 1000 1001 warnp("Accepted a connection from %s\n", satos(&peer_address.sa)); 1002 1003 /* Verify if it should connect - XXX: no check for INET6 */ 1004 if (peer_address.sa.sa_family == AF_INET && 1005 ntohl(peer_address.sin.sin_addr.s_addr) < 1006 ntohl(my_address.sin.sin_addr.s_addr)) { 1007 fatalp("Peer %s: connect from lower ID\n", 1008 satos(&peer_address.sa)); 1009 close(s); 1010 return; 1011 } 1012 1013 /* Match hello info in order to get ldp_id */ 1014 SLIST_FOREACH(hi, &hello_info_head, infos) { 1015 if (sockaddr_cmp(&peer_address.sa, 1016 &hi->transport_address.sa) == 0) { 1017 peer_ldp_id = &hi->ldp_id; 1018 break; 1019 } 1020 } 1021 if (peer_ldp_id == NULL) { 1022 warnp("Got connection from %s, but no hello info exists\n", 1023 satos(&peer_address.sa)); 1024 close(s); 1025 return; 1026 } else 1027 ldp_peer_new(peer_ldp_id, &peer_address.sa, NULL, 1028 ldp_holddown_time, s); 1029 1030 } 1031 1032 void 1033 send_initialize(const struct ldp_peer * p) 1034 { 1035 struct init_tlv ti; 1036 1037 ti.type = htons(LDP_INITIALIZE); 1038 ti.length = htons(sizeof(struct init_tlv) - TLV_TYPE_LENGTH); 1039 ti.messageid = htonl(get_message_id()); 1040 ti.cs_type = htons(TLV_COMMON_SESSION); 1041 ti.cs_len = htons(CS_LEN); 1042 ti.cs_version = htons(LDP_VERSION); 1043 ti.cs_keepalive = htons(2 * ldp_keepalive_time); 1044 ti.cs_adpvlim = 0; 1045 ti.cs_maxpdulen = htons(MAX_PDU_SIZE); 1046 ti.cs_peeraddress.s_addr = p->ldp_id.s_addr; 1047 ti.cs_peeraddrspace = 0; 1048 1049 send_tlv(p, (struct tlv *) (void *) &ti); 1050 } 1051 1052 void 1053 keep_alive(const struct ldp_peer * p) 1054 { 1055 struct ka_tlv kt; 1056 1057 kt.type = htons(LDP_KEEPALIVE); 1058 kt.length = htons(sizeof(kt.messageid)); 1059 kt.messageid = htonl(get_message_id()); 1060 1061 send_tlv(p, (struct tlv *) (void *) &kt); 1062 } 1063 1064 /* 1065 * Process a message received from a peer 1066 */ 1067 void 1068 recv_session_pdu(struct ldp_peer * p) 1069 { 1070 struct ldp_pdu *rpdu; 1071 struct address_tlv *atlv; 1072 struct al_tlv *altlv; 1073 struct init_tlv *itlv; 1074 struct label_map_tlv *lmtlv; 1075 struct fec_tlv *fectlv; 1076 struct label_tlv *labeltlv; 1077 struct notification_tlv *nottlv; 1078 struct hello_info *hi; 1079 1080 int c; 1081 int32_t wo = 0; 1082 struct tlv *ttmp; 1083 unsigned char recvspace[MAX_PDU_SIZE]; 1084 1085 memset(recvspace, 0, MAX_PDU_SIZE); 1086 1087 do { 1088 c = recv(p->socket, (void *) recvspace, MAX_PDU_SIZE, MSG_PEEK); 1089 } while (c == -1 && errno == EINTR); 1090 1091 debugp("Ready to read %d bytes\n", c); 1092 1093 if (c < 1) { /* Session closed */ 1094 warnp("Error in connection with %s\n", inet_ntoa(p->ldp_id)); 1095 ldp_peer_holddown(p); 1096 return; 1097 } 1098 if (c > MAX_PDU_SIZE) { 1099 debugp("Incoming PDU size exceeds MAX_PDU_SIZE !\n"); 1100 return; 1101 } 1102 if (c < MIN_PDU_SIZE) { 1103 debugp("PDU too small received from peer %s\n", 1104 inet_ntoa(p->ldp_id)); 1105 return; 1106 } 1107 rpdu = (struct ldp_pdu *) recvspace; 1108 do { 1109 c = recv(p->socket, (void *) recvspace, 1110 ntohs(rpdu->length) + PDU_VER_LENGTH, MSG_WAITALL); 1111 } while (c == -1 && errno == EINTR); 1112 1113 /* sanity check */ 1114 if (check_recv_pdu(p, rpdu, c) != 0) 1115 return; 1116 1117 debugp("Read %d bytes, PDU size: %d bytes\n", c, ntohs(rpdu->length)); 1118 wo = sizeof(struct ldp_pdu); 1119 1120 while (wo + TLV_TYPE_LENGTH < (uint)c) { 1121 1122 ttmp = (struct tlv *) (&recvspace[wo]); 1123 1124 if ((ntohs(ttmp->type) != LDP_KEEPALIVE) && 1125 (ntohs(ttmp->type) != LDP_LABEL_MAPPING)) { 1126 debugp("Got Type: 0x%.4X (Length: %d) from %s\n", 1127 ntohs(ttmp->type), ntohs(ttmp->length), 1128 inet_ntoa(p->ldp_id)); 1129 } else 1130 debugp("Got Type: 0x%.4X (Length: %d) from %s\n", 1131 ntohs(ttmp->type), ntohs(ttmp->length), 1132 inet_ntoa(p->ldp_id)); 1133 1134 /* Should we get the message ? */ 1135 if (p->state != LDP_PEER_ESTABLISHED && 1136 ntohs(ttmp->type) != LDP_INITIALIZE && 1137 ntohs(ttmp->type) != LDP_KEEPALIVE && 1138 ntohs(ttmp->type) != LDP_NOTIFICATION) 1139 break; 1140 /* The big switch */ 1141 switch (ntohs(ttmp->type)) { 1142 case LDP_INITIALIZE: 1143 itlv = (struct init_tlv *)ttmp; 1144 /* Check size */ 1145 if (ntohs(itlv->length) < 1146 sizeof(struct init_tlv) - TLV_TYPE_LENGTH) { 1147 debugp("Bad size\n"); 1148 send_notification(p, 0, 1149 NOTIF_BAD_PDU_LEN | NOTIF_FATAL); 1150 ldp_peer_holddown(p); 1151 break; 1152 } 1153 /* Check version */ 1154 if (ntohs(itlv->cs_version) != LDP_VERSION) { 1155 debugp("Bad version"); 1156 send_notification(p, ntohl(itlv->messageid), 1157 NOTIF_BAD_LDP_VER | NOTIF_FATAL); 1158 ldp_peer_holddown(p); 1159 break; 1160 } 1161 /* Check if we got any hello from this one */ 1162 SLIST_FOREACH(hi, &hello_info_head, infos) 1163 if (hi->ldp_id.s_addr == rpdu->ldp_id.s_addr) 1164 break; 1165 if (hi == NULL) { 1166 debugp("No hello. Moving peer to holddown\n"); 1167 send_notification(p, ntohl(itlv->messageid), 1168 NOTIF_SESSION_REJECTED_NO_HELLO | NOTIF_FATAL); 1169 ldp_peer_holddown(p); 1170 break; 1171 } 1172 1173 if (!p->master) { 1174 send_initialize(p); 1175 keep_alive(p); 1176 } else { 1177 p->state = LDP_PEER_ESTABLISHED; 1178 p->established_t = time(NULL); 1179 keep_alive(p); 1180 1181 /* 1182 * Recheck here ldp id because we accepted 1183 * connection without knowing who is it for sure 1184 */ 1185 p->ldp_id.s_addr = rpdu->ldp_id.s_addr; 1186 1187 fatalp("LDP neighbour %s is UP\n", 1188 inet_ntoa(p->ldp_id)); 1189 mpls_add_ldp_peer(p); 1190 send_addresses(p); 1191 send_all_bindings(p); 1192 } 1193 break; 1194 case LDP_KEEPALIVE: 1195 if ((p->state == LDP_PEER_CONNECTED) && (!p->master)) { 1196 p->state = LDP_PEER_ESTABLISHED; 1197 p->established_t = time(NULL); 1198 fatalp("LDP neighbour %s is UP\n", 1199 inet_ntoa(p->ldp_id)); 1200 mpls_add_ldp_peer(p); 1201 send_addresses(p); 1202 send_all_bindings(p); 1203 } 1204 p->timeout = p->holdtime; 1205 break; 1206 case LDP_ADDRESS: 1207 /* Add peer addresses */ 1208 atlv = (struct address_tlv *) ttmp; 1209 altlv = (struct al_tlv *) (&atlv[1]); 1210 add_ifaddresses(p, altlv); 1211 /* 1212 * try to see if we have labels with null peer that 1213 * would match the new peer 1214 */ 1215 label_check_assoc(p); 1216 print_bounded_addresses(p); 1217 break; 1218 case LDP_ADDRESS_WITHDRAW: 1219 atlv = (struct address_tlv *) ttmp; 1220 altlv = (struct al_tlv *) (&atlv[1]); 1221 del_ifaddresses(p, altlv); 1222 break; 1223 case LDP_LABEL_MAPPING: 1224 lmtlv = (struct label_map_tlv *) ttmp; 1225 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1226 labeltlv = (struct label_tlv *)((unsigned char *)fectlv 1227 + ntohs(fectlv->length) + TLV_TYPE_LENGTH); 1228 map_label(p, fectlv, labeltlv); 1229 break; 1230 case LDP_LABEL_REQUEST: 1231 lmtlv = (struct label_map_tlv *) ttmp; 1232 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1233 switch (request_respond(p, lmtlv, fectlv)) { 1234 case LDP_E_BAD_FEC: 1235 send_notification(p, ntohl(lmtlv->messageid), 1236 NOTIF_UNKNOWN_TLV); 1237 break; 1238 case LDP_E_BAD_AF: 1239 send_notification(p, ntohl(lmtlv->messageid), 1240 NOTIF_UNSUPPORTED_AF); 1241 break; 1242 case LDP_E_NO_SUCH_ROUTE: 1243 send_notification(p, ntohl(lmtlv->messageid), 1244 NOTIF_NO_ROUTE); 1245 break; 1246 } 1247 break; 1248 case LDP_LABEL_WITHDRAW: 1249 lmtlv = (struct label_map_tlv *) ttmp; 1250 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1251 if (withdraw_label(p, fectlv) == LDP_E_OK) { 1252 /* Send RELEASE */ 1253 prepare_release(ttmp); 1254 send_tlv(p, ttmp); 1255 } 1256 break; 1257 case LDP_LABEL_RELEASE: 1258 /* 1259 * XXX: we need to make a timed queue... 1260 * For now I just assume peers are processing messages 1261 * correctly so I just ignore confirmations 1262 */ 1263 wo = -1; /* Ignore rest of message */ 1264 break; 1265 case LDP_LABEL_ABORT: 1266 /* XXX: For now I pretend I can process everything 1267 * RFC 5036, Section 3.5.9.1 1268 * If an LSR receives a Label Abort Request Message after it 1269 * has responded to the Label Request in question with a Label 1270 * Mapping message or a Notification message, it ignores the 1271 * abort request. 1272 */ 1273 wo = -1; 1274 break; 1275 case LDP_NOTIFICATION: 1276 nottlv = (struct notification_tlv *) ttmp; 1277 nottlv->st_code = ntohl(nottlv->st_code); 1278 fatalp("Got notification 0x%X from peer %s\n", 1279 nottlv->st_code, inet_ntoa(p->ldp_id)); 1280 if (nottlv->st_code >> 31) { 1281 fatalp("LDP peer %s signalized %s\n", 1282 inet_ntoa(p->ldp_id), 1283 NOTIF_STR[(nottlv->st_code << 1) >> 1]); 1284 ldp_peer_holddown(p); 1285 wo = -1; 1286 } 1287 break; 1288 case LDP_HELLO: 1289 /* No hellos should came on tcp session */ 1290 wo = -1; 1291 break; 1292 default: 1293 warnp("Unknown TLV received from %s\n", 1294 inet_ntoa(p->ldp_id)); 1295 debug_tlv(ttmp); 1296 wo = -1;/* discard the rest of the message */ 1297 break; 1298 } 1299 if (wo < 0) { 1300 debugp("Discarding the rest of the message\n"); 1301 break; 1302 } else { 1303 wo += ntohs(ttmp->length) + TLV_TYPE_LENGTH; 1304 debugp("WORKED ON %u bytes (Left %d)\n", wo, c - wo); 1305 } 1306 } /* while */ 1307 1308 } 1309 1310 /* Sends a pdu, tlv pair to a connected peer */ 1311 int 1312 send_message(const struct ldp_peer * p, const struct ldp_pdu * pdu, 1313 const struct tlv * t) 1314 { 1315 unsigned char sendspace[MAX_PDU_SIZE]; 1316 1317 /* Check if peer is connected */ 1318 switch (p->state) { 1319 case LDP_PEER_CONNECTED: 1320 case LDP_PEER_ESTABLISHED: 1321 break; 1322 default: 1323 return -1; 1324 } 1325 1326 /* Check length validity first */ 1327 if (ntohs(pdu->length) != 1328 ntohs(t->length) + TLV_TYPE_LENGTH + PDU_PAYLOAD_LENGTH) { 1329 fatalp("LDP: TLV - PDU incompability. Message discarded\n"); 1330 fatalp("LDP: TLV len %d - PDU len %d\n", ntohs(t->length), 1331 ntohs(pdu->length)); 1332 return -1; 1333 } 1334 if (ntohs(t->length) + PDU_VER_LENGTH > MAX_PDU_SIZE) { 1335 fatalp("Message to large discarded\n"); 1336 return -1; 1337 } 1338 /* Arrange them in a buffer and send */ 1339 memcpy(sendspace, pdu, sizeof(struct ldp_pdu)); 1340 memcpy(sendspace + sizeof(struct ldp_pdu), t, 1341 ntohs(t->length) + TLV_TYPE_LENGTH); 1342 1343 /* Report keepalives only for DEBUG */ 1344 if ((ntohs(t->type) != 0x201) && (ntohs(t->type) != 0x400)) { 1345 debugp("Sending message type 0x%.4X to %s (size: %d)\n", 1346 ntohs(t->type), inet_ntoa(p->ldp_id), ntohs(t->length)); 1347 } else 1348 /* downgraded from warnp to debugp for now */ 1349 debugp("Sending message type 0x%.4X to %s (size: %d)\n", 1350 ntohs(t->type), inet_ntoa(p->ldp_id), ntohs(t->length)); 1351 1352 /* Send it finally */ 1353 return send(p->socket, sendspace, 1354 ntohs(pdu->length) + PDU_VER_LENGTH, 0); 1355 } 1356 1357 /* 1358 * Encapsulates TLV into a PDU and sends it to a peer 1359 */ 1360 int 1361 send_tlv(const struct ldp_peer * p, const struct tlv * t) 1362 { 1363 struct ldp_pdu pdu; 1364 1365 pdu.version = htons(LDP_VERSION); 1366 inet_aton(LDP_ID, &pdu.ldp_id); 1367 pdu.label_space = 0; 1368 pdu.length = htons(ntohs(t->length) + TLV_TYPE_LENGTH + 1369 PDU_PAYLOAD_LENGTH); 1370 1371 return send_message(p, &pdu, t); 1372 } 1373 1374 1375 int 1376 send_addresses(const struct ldp_peer * p) 1377 { 1378 struct address_list_tlv *t; 1379 int ret; 1380 1381 t = build_address_list_tlv(); 1382 1383 ret = send_tlv(p, (struct tlv *) t); 1384 free(t); 1385 return ret; 1386 1387 } 1388