1 /* $NetBSD: socketops.c,v 1.32 2013/10/17 18:10:23 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 conf_interface *coif; 291 292 SLIST_FOREACH(coif, &coifs_head, iflist) 293 if (strncasecmp(if_name, coif->if_name, IF_NAMESIZE) == 0 && 294 coif->passive != 0) 295 return 1; 296 return 0; 297 } 298 299 /* Sets the TTL to 1 as we don't want to transmit outside this subnet */ 300 int 301 set_ttl(int s) 302 { 303 int ret; 304 if ((ret = setsockopt(s, IPPROTO_IP, IP_TTL, &(int){1}, sizeof(int))) 305 == -1) 306 fatalp("set_ttl: %s", strerror(errno)); 307 return ret; 308 } 309 310 /* Sets TOS to 0xc0 aka IP Precedence 6 */ 311 static int 312 set_tos(int s) 313 { 314 int ret; 315 if ((ret = setsockopt(s, IPPROTO_IP, IP_TOS, &(int){0xc0}, 316 sizeof(int))) == -1) 317 fatalp("set_tos: %s", strerror(errno)); 318 return ret; 319 } 320 321 static int 322 socket_reuse_port(int s) 323 { 324 int ret; 325 if ((ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &(int){1}, 326 sizeof(int))) == -1) 327 fatalp("socket_reuse_port: %s", strerror(errno)); 328 return ret; 329 } 330 331 /* binds an UDP socket */ 332 static int 333 bind_socket(int s, int stype) 334 { 335 union sockunion su; 336 337 assert (stype == AF_INET || stype == AF_INET6); 338 339 if (stype == AF_INET) { 340 su.sin.sin_len = sizeof(su.sin); 341 su.sin.sin_family = AF_INET; 342 su.sin.sin_addr.s_addr = htonl(INADDR_ANY); 343 su.sin.sin_port = htons(LDP_PORT); 344 } 345 #ifdef INET6 346 else if (stype == AF_INET6) { 347 su.sin6.sin6_len = sizeof(su.sin6); 348 su.sin6.sin6_family = AF_INET6; 349 su.sin6.sin6_addr = in6addr_any; 350 su.sin6.sin6_port = htons(LDP_PORT); 351 } 352 #endif 353 if (bind(s, &su.sa, su.sa.sa_len)) { 354 fatalp("bind_socket: %s\n", strerror(errno)); 355 return -1; 356 } 357 return 0; 358 } 359 360 /* Create / bind the TCP socket */ 361 int 362 create_listening_socket(void) 363 { 364 struct sockaddr_in sa; 365 int s; 366 367 sa.sin_len = sizeof(sa); 368 sa.sin_family = AF_INET; 369 sa.sin_port = htons(LDP_PORT); 370 sa.sin_addr.s_addr = htonl(INADDR_ANY); 371 372 s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); 373 if (s < 0) 374 return s; 375 if (bind(s, (struct sockaddr *) & sa, sizeof(sa))) { 376 fatalp("bind: %s", strerror(errno)); 377 close(s); 378 return -1; 379 } 380 if (listen(s, 10) == -1) { 381 fatalp("listen: %s", strerror(errno)); 382 close(s); 383 return -1; 384 } 385 /* if (set_tos(s) == -1) { 386 fatalp("set_tos: %s", strerror(errno)); 387 close(s); 388 return -1; 389 } 390 */ return s; 391 } 392 393 /* 394 * It's ugly. We need a function to pass all tlvs and create pdu but since I 395 * use UDP socket only to send hellos, I didn't bother 396 */ 397 void 398 send_hello(void) 399 { 400 struct hello_tlv *t; 401 struct common_hello_tlv *cht; 402 struct ldp_pdu *spdu; 403 struct transport_address_tlv *trtlv; 404 void *v; 405 struct sockaddr_in sadest; /* Destination ALL_ROUTERS */ 406 ssize_t sb = 0; /* sent bytes */ 407 struct ifaddrs *ifa, *ifb; 408 struct sockaddr_in *if_sa; 409 int ip4socket = -1; 410 uint lastifindex; 411 struct hello_socket *hs; 412 struct conf_interface *coif; 413 bool bad_tr_addr; 414 #ifdef INET6 415 struct sockaddr_in6 sadest6; 416 int ip6socket = -1; 417 #endif 418 419 #define BASIC_HELLO_MSG_SIZE (sizeof(struct ldp_pdu) + /* PDU */ \ 420 TLV_TYPE_LENGTH + MSGID_SIZE + /* Hello TLV */ \ 421 /* Common Hello TLV */ \ 422 sizeof(struct common_hello_tlv)) 423 #define GENERAL_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + \ 424 /* Transport Address */ \ 425 sizeof(struct transport_address_tlv) 426 #define IPV4_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + 4 + sizeof(struct in_addr) 427 #define IPV6_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + 4 + sizeof(struct in6_addr) 428 429 if ((v = calloc(1, GENERAL_HELLO_MSG_SIZE)) == NULL) { 430 fatalp("alloc problem in send_hello()\n"); 431 return; 432 } 433 434 spdu = (struct ldp_pdu *)((char *)v); 435 t = (struct hello_tlv *)(spdu + 1); 436 cht = &t->ch; /* Hello tlv struct includes CHT */ 437 trtlv = (struct transport_address_tlv *)(t + 1); 438 439 /* Prepare PDU envelope */ 440 spdu->version = htons(LDP_VERSION); 441 spdu->length = htons(IPV4_HELLO_MSG_SIZE - PDU_VER_LENGTH); 442 inet_aton(LDP_ID, &spdu->ldp_id); 443 444 /* Prepare Hello TLV */ 445 t->type = htons(LDP_HELLO); 446 t->length = htons(MSGID_SIZE + 447 sizeof(struct common_hello_tlv) + 448 IPV4_HELLO_MSG_SIZE - BASIC_HELLO_MSG_SIZE); 449 /* 450 * We used ID 0 instead of htonl(get_message_id()) because we've 451 * seen hellos from Cisco routers doing the same thing 452 */ 453 t->messageid = 0; 454 455 /* Prepare Common Hello attributes */ 456 cht->type = htons(TLV_COMMON_HELLO); 457 cht->length = htons(sizeof(cht->holdtime) + sizeof(cht->res)); 458 cht->holdtime = htons(ldp_holddown_time); 459 cht->res = 0; 460 461 /* 462 * Prepare Transport Address TLV RFC5036 says: "If this optional TLV 463 * is not present the IPv4 source address for the UDP packet carrying 464 * the Hello should be used." But we send it because everybody seems 465 * to do so 466 */ 467 trtlv->type = htons(TLV_IPV4_TRANSPORT); 468 trtlv->length = htons(sizeof(struct in_addr)); 469 /* trtlv->address will be set for each socket */ 470 471 /* Destination sockaddr */ 472 memset(&sadest, 0, sizeof(sadest)); 473 sadest.sin_len = sizeof(sadest); 474 sadest.sin_family = AF_INET; 475 sadest.sin_port = htons(LDP_PORT); 476 sadest.sin_addr.s_addr = htonl(INADDR_ALLRTRS_GROUP); 477 478 /* Find our socket */ 479 SLIST_FOREACH(hs, &hello_socket_head, listentry) 480 if (hs->type == AF_INET) { 481 ip4socket = hs->socket; 482 break; 483 } 484 assert(ip4socket >= 0); 485 486 if (getifaddrs(&ifa) == -1) { 487 free(v); 488 fatalp("Cannot enumerate interfaces\n"); 489 return; 490 } 491 492 lastifindex = UINT_MAX; 493 /* Loop all interfaces in order to send IPv4 hellos */ 494 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 495 if_sa = (struct sockaddr_in *) ifb->ifa_addr; 496 if (if_sa->sin_family != AF_INET || 497 (!(ifb->ifa_flags & IFF_UP)) || 498 (ifb->ifa_flags & IFF_LOOPBACK) || 499 (!(ifb->ifa_flags & IFF_MULTICAST)) || 500 is_passive_if(ifb->ifa_name) || 501 (ntohl(if_sa->sin_addr.s_addr) >> 24 == IN_LOOPBACKNET) || 502 lastifindex == if_nametoindex(ifb->ifa_name)) 503 continue; 504 505 /* Send only once per interface, using primary address */ 506 if (lastifindex == if_nametoindex(ifb->ifa_name)) 507 continue; 508 /* Check if there is transport address set for this interface */ 509 bad_tr_addr = false; 510 SLIST_FOREACH(coif, &coifs_head, iflist) 511 if (strncasecmp(coif->if_name, ifb->ifa_name, 512 IF_NAMESIZE) == 0 && 513 coif->tr_addr.s_addr != 0 && 514 coif->tr_addr.s_addr != if_sa->sin_addr.s_addr) 515 bad_tr_addr = true; 516 if (bad_tr_addr == true) 517 continue; 518 lastifindex = if_nametoindex(ifb->ifa_name); 519 520 if (setsockopt(ip4socket, IPPROTO_IP, IP_MULTICAST_IF, 521 &if_sa->sin_addr, sizeof(struct in_addr)) == -1) { 522 warnp("setsockopt failed: %s\n", strerror(errno)); 523 continue; 524 } 525 trtlv->address.ip4addr.s_addr = if_sa->sin_addr.s_addr; 526 527 /* Put it on the wire */ 528 sb = sendto(ip4socket, v, IPV4_HELLO_MSG_SIZE, 0, 529 (struct sockaddr *) & sadest, sizeof(sadest)); 530 if (sb < (ssize_t)(IPV4_HELLO_MSG_SIZE)) 531 fatalp("send: %s", strerror(errno)); 532 else 533 debugp("Sent (IPv4) %zd bytes on %s" 534 " (PDU: %d, Hello TLV: %d, CH: %d, TR: %d)\n", 535 sb, ifb->ifa_name, 536 ntohs(spdu->length), ntohs(t->length), 537 ntohs(cht->length), ntohs(trtlv->length)); 538 } 539 #ifdef INET6 540 /* Adjust lengths */ 541 spdu->length = htons(IPV6_HELLO_MSG_SIZE - PDU_VER_LENGTH); 542 t->length = htons(MSGID_SIZE + 543 sizeof(struct common_hello_tlv) + 544 IPV6_HELLO_MSG_SIZE - BASIC_HELLO_MSG_SIZE); 545 trtlv->length = htons(sizeof(struct in6_addr)); 546 trtlv->type = htons(TLV_IPV6_TRANSPORT); 547 548 /* Prepare destination sockaddr */ 549 memset(&sadest6, 0, sizeof(sadest6)); 550 sadest6.sin6_len = sizeof(sadest6); 551 sadest6.sin6_family = AF_INET6; 552 sadest6.sin6_port = htons(LDP_PORT); 553 sadest6.sin6_addr = in6addr_linklocal_allrouters; 554 555 SLIST_FOREACH(hs, &hello_socket_head, listentry) 556 if (hs->type == AF_INET6) { 557 ip6socket = hs->socket; 558 break; 559 } 560 561 lastifindex = UINT_MAX; 562 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 563 struct sockaddr_in6 * if_sa6 = 564 (struct sockaddr_in6 *) ifb->ifa_addr; 565 if (if_sa6->sin6_family != AF_INET6 || 566 (!(ifb->ifa_flags & IFF_UP)) || 567 (!(ifb->ifa_flags & IFF_MULTICAST)) || 568 (ifb->ifa_flags & IFF_LOOPBACK) || 569 is_passive_if(ifb->ifa_name) || 570 IN6_IS_ADDR_LOOPBACK(&if_sa6->sin6_addr)) 571 continue; 572 /* 573 * draft-ietf-mpls-ldp-ipv6-07 Section 5.1: 574 * Additionally, the link-local 575 * IPv6 address MUST be used as the source IP address in IPv6 576 * LDP Link Hellos. 577 */ 578 if (IN6_IS_ADDR_LINKLOCAL(&if_sa6->sin6_addr) == 0) 579 continue; 580 /* We should have only one LLADDR per interface, but... */ 581 if (lastifindex == if_nametoindex(ifb->ifa_name)) 582 continue; 583 lastifindex = if_nametoindex(ifb->ifa_name); 584 585 if (setsockopt(ip6socket, IPPROTO_IPV6, IPV6_MULTICAST_IF, 586 &lastifindex, sizeof(int)) == -1) { 587 fatalp("ssopt6 IPV6_MULTICAST_IF failed: %s for %s\n", 588 strerror(errno), ifb->ifa_name); 589 continue; 590 } 591 592 memcpy(&trtlv->address.ip6addr, &if_sa6->sin6_addr, 593 sizeof(struct in6_addr)); 594 595 /* Put it on the wire */ 596 sb = sendto(ip6socket, v, IPV6_HELLO_MSG_SIZE, 597 0, (struct sockaddr *)&sadest6, sizeof(sadest6)); 598 if (sb < (ssize_t)(IPV6_HELLO_MSG_SIZE)) 599 fatalp("send6: %s", strerror(errno)); 600 else 601 debugp("Sent (IPv6) %zd bytes on %s " 602 "(PDU: %d, Hello TLV: %d, CH: %d TR: %d)\n", 603 sb, ifb->ifa_name, htons(spdu->length), 604 htons(t->length), htons(cht->length), 605 htons(trtlv->length)); 606 } 607 #endif 608 freeifaddrs(ifa); 609 free(v); 610 } 611 612 int 613 get_message_id(void) 614 { 615 current_msg_id++; 616 return current_msg_id; 617 } 618 619 static int 620 get_local_addr(struct sockaddr_dl *sdl, struct in_addr *sin) 621 { 622 struct ifaddrs *ifa, *ifb; 623 struct sockaddr_in *sinet; 624 625 if (sdl == NULL) 626 return -1; 627 628 if (getifaddrs(&ifa) == -1) 629 return -1; 630 for (ifb = ifa; ifb; ifb = ifb->ifa_next) 631 if (ifb->ifa_addr->sa_family == AF_INET) { 632 if (if_nametoindex(ifb->ifa_name) != sdl->sdl_index) 633 continue; 634 sinet = (struct sockaddr_in*) ifb->ifa_addr; 635 sin->s_addr = sinet->sin_addr.s_addr; 636 freeifaddrs(ifa); 637 return 0; 638 } 639 freeifaddrs(ifa); 640 return -1; 641 } 642 643 /* Receive PDUs on Multicast UDP socket */ 644 void 645 recv_pdu(int sock) 646 { 647 struct ldp_pdu rpdu; 648 int c, i; 649 struct msghdr msg; 650 struct iovec iov[1]; 651 unsigned char recvspace[MAX_PDU_SIZE]; 652 struct hello_tlv *t; 653 union sockunion sender; 654 struct sockaddr_dl *sdl = NULL; 655 struct in_addr my_ldp_addr, local_addr; 656 struct cmsghdr *cmptr; 657 union { 658 struct cmsghdr cm; 659 char control[1024]; 660 } control_un; 661 662 memset(&msg, 0, sizeof(msg)); 663 msg.msg_control = control_un.control; 664 msg.msg_controllen = sizeof(control_un.control); 665 msg.msg_flags = 0; 666 msg.msg_name = &sender; 667 msg.msg_namelen = sizeof(sender); 668 iov[0].iov_base = recvspace; 669 iov[0].iov_len = sizeof(recvspace); 670 msg.msg_iov = iov; 671 msg.msg_iovlen = 1; 672 673 c = recvmsg(sock, &msg, MSG_WAITALL); 674 675 /* Check to see if this is larger than MIN_PDU_SIZE */ 676 if (c < MIN_PDU_SIZE) 677 return; 678 679 /* Read the PDU */ 680 i = get_pdu(recvspace, &rpdu); 681 682 debugp("recv_pdu(%d): PDU(size: %d) from: %s\n", sock, 683 c, satos(&sender.sa)); 684 685 /* We currently understand Version 1 */ 686 if (rpdu.version != LDP_VERSION) { 687 warnp("recv_pdu: Version mismatch\n"); 688 return; 689 } 690 691 /* Check if it's our hello */ 692 inet_aton(LDP_ID, &my_ldp_addr); 693 if (rpdu.ldp_id.s_addr == my_ldp_addr.s_addr) { 694 /* It should not be looped. We set MULTICAST_LOOP 0 */ 695 fatalp("Received our PDU. Ignoring it\n"); 696 return; 697 } 698 699 if (msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr) || 700 (msg.msg_flags & MSG_CTRUNC)) 701 local_addr.s_addr = my_ldp_addr.s_addr; 702 else { 703 for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL; 704 cmptr = CMSG_NXTHDR(&msg, cmptr)) 705 if (cmptr->cmsg_level == IPPROTO_IP && 706 cmptr->cmsg_type == IP_RECVIF) { 707 sdl = (struct sockaddr_dl *) CMSG_DATA(cmptr); 708 break; 709 } 710 if (get_local_addr(sdl, &local_addr) != 0) 711 local_addr.s_addr = my_ldp_addr.s_addr; 712 } 713 714 715 debugp("Read %d bytes from address %s Length: %.4d Version: %d\n", 716 c, inet_ntoa(rpdu.ldp_id), rpdu.length, rpdu.version); 717 718 /* Fill the TLV messages */ 719 t = get_hello_tlv(recvspace + i, c - i); 720 run_ldp_hello(&rpdu, t, &sender.sa, &local_addr, sock, may_connect); 721 } 722 723 void 724 send_hello_alarm(int unused) 725 { 726 struct ldp_peer *p, *ptmp; 727 struct hello_info *hi, *hinext; 728 time_t t = time(NULL); 729 int olderrno = errno; 730 731 if (may_connect == false) 732 may_connect = true; 733 /* Send hellos */ 734 if (!(t % ldp_hello_time)) 735 send_hello(); 736 737 /* Timeout -- */ 738 SLIST_FOREACH(p, &ldp_peer_head, peers) 739 p->timeout--; 740 741 /* Check for timeout */ 742 SLIST_FOREACH_SAFE(p, &ldp_peer_head, peers, ptmp) 743 if (p->timeout < 1) 744 switch (p->state) { 745 case LDP_PEER_HOLDDOWN: 746 debugp("LDP holddown expired for peer %s\n", 747 inet_ntoa(p->ldp_id)); 748 ldp_peer_delete(p); 749 break; 750 case LDP_PEER_ESTABLISHED: 751 case LDP_PEER_CONNECTED: 752 send_notification(p, 0, 753 NOTIF_FATAL|NOTIF_KEEP_ALIVE_TIMER_EXPIRED); 754 warnp("Keepalive expired for %s\n", 755 inet_ntoa(p->ldp_id)); 756 ldp_peer_holddown(p); 757 break; 758 } /* switch */ 759 760 /* send keepalives */ 761 if (!(t % ldp_keepalive_time)) { 762 SLIST_FOREACH(p, &ldp_peer_head, peers) 763 if (p->state == LDP_PEER_ESTABLISHED) { 764 debugp("Sending KeepAlive to %s\n", 765 inet_ntoa(p->ldp_id)); 766 keep_alive(p); 767 } 768 } 769 770 /* Decrement and Check hello keepalives */ 771 SLIST_FOREACH_SAFE(hi, &hello_info_head, infos, hinext) { 772 if (hi->keepalive != 0xFFFF) 773 hi->keepalive--; 774 if (hi->keepalive < 1) 775 SLIST_REMOVE(&hello_info_head, hi, hello_info, infos); 776 } 777 778 /* Set the alarm again and bail out */ 779 alarm(1); 780 errno = olderrno; 781 } 782 783 static void 784 bail_out(int x) 785 { 786 ldp_peer_holddown_all(); 787 flush_mpls_routes(); 788 exit(0); 789 } 790 791 static void 792 print_info(int x) 793 { 794 printf("Info for %s\n-------\n", LDP_ID); 795 printf("Neighbours:\n"); 796 show_neighbours(1, NULL); 797 printf("Bindings:\n"); 798 show_bindings(1, NULL); 799 printf("Labels:\n"); 800 show_labels(1, NULL); 801 printf("--------\n"); 802 } 803 804 /* 805 * The big poll that catches every single event 806 * on every socket. 807 */ 808 int 809 the_big_loop(void) 810 { 811 int sock_error; 812 uint32_t i; 813 socklen_t sock_error_size = sizeof(int); 814 struct ldp_peer *p; 815 struct com_sock *cs; 816 struct pollfd pfd[MAX_POLL_FDS]; 817 struct hello_socket *hs; 818 nfds_t pollsum; 819 820 assert(MAX_POLL_FDS > 5); 821 822 SLIST_INIT(&hello_info_head); 823 824 signal(SIGALRM, send_hello_alarm); 825 signal(SIGPIPE, SIG_IGN); 826 signal(SIGINT, bail_out); 827 signal(SIGTERM, bail_out); 828 signal(SIGINFO, print_info); 829 830 /* Send first hellos in 5 seconds. Avoid No hello notifications */ 831 may_connect = false; 832 alarm(5); 833 834 route_socket = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC); 835 setsockopt(route_socket, SOL_SOCKET, SO_USELOOPBACK, &(int){0}, 836 sizeof(int)); 837 838 sock_error = bind_current_routes(); 839 if (sock_error != LDP_E_OK) { 840 fatalp("Cannot get current routes\n"); 841 return sock_error; 842 } 843 844 for (;;) { 845 pfd[0].fd = ls; 846 pfd[0].events = POLLRDNORM; 847 pfd[0].revents = 0; 848 849 pfd[1].fd = route_socket; 850 pfd[1].events = POLLRDNORM; 851 pfd[1].revents = 0; 852 853 pfd[2].fd = command_socket; 854 pfd[2].events = POLLRDNORM; 855 pfd[2].revents = 0; 856 857 /* Hello sockets */ 858 pollsum = 3; 859 SLIST_FOREACH(hs, &hello_socket_head, listentry) { 860 pfd[pollsum].fd = hs->socket; 861 pfd[pollsum].events = POLLIN; 862 pfd[pollsum].revents = 0; 863 pollsum++; 864 } 865 866 /* Command sockets */ 867 for (i=0; i < MAX_COMMAND_SOCKETS; i++) 868 if (csockets[i].socket != -1) { 869 if (pollsum >= MAX_POLL_FDS) 870 break; 871 pfd[pollsum].fd = csockets[i].socket; 872 pfd[pollsum].events = POLLIN; 873 pfd[pollsum].revents = 0; 874 pollsum++; 875 } 876 877 /* LDP Peer sockets */ 878 SLIST_FOREACH(p, &ldp_peer_head, peers) { 879 if (p->socket < 1) 880 continue; 881 switch (p->state) { 882 case LDP_PEER_CONNECTED: 883 case LDP_PEER_ESTABLISHED: 884 if (pollsum >= MAX_POLL_FDS) 885 break; 886 pfd[pollsum].fd = p->socket; 887 pfd[pollsum].events = POLLRDNORM; 888 pfd[pollsum].revents = 0; 889 pollsum++; 890 break; 891 case LDP_PEER_CONNECTING: 892 if (pollsum >= MAX_POLL_FDS) 893 break; 894 pfd[pollsum].fd = p->socket; 895 pfd[pollsum].events = POLLWRNORM; 896 pfd[pollsum].revents = 0; 897 pollsum++; 898 break; 899 } 900 } 901 902 if (pollsum >= MAX_POLL_FDS) { 903 fatalp("Too many sockets. Increase MAX_POLL_FDS\n"); 904 return LDP_E_TOO_MANY_FDS; 905 } 906 if (poll(pfd, pollsum, INFTIM) < 0) { 907 if (errno != EINTR) 908 fatalp("poll: %s", strerror(errno)); 909 continue; 910 } 911 912 for (i = 0; i < pollsum; i++) { 913 if ((pfd[i].revents & POLLRDNORM) || 914 (pfd[i].revents & POLLIN)) { 915 if(pfd[i].fd == ls) 916 new_peer_connection(); 917 else if (pfd[i].fd == route_socket) { 918 struct rt_msg xbuf; 919 int l, rtmlen = sizeof(xbuf); 920 /* Read at least rtm_msglen */ 921 l = recv(route_socket, &xbuf, 922 sizeof(u_short), MSG_PEEK); 923 if (l == sizeof(u_short)) 924 rtmlen = xbuf.m_rtm.rtm_msglen; 925 do { 926 l = recv(route_socket, &xbuf, 927 rtmlen, MSG_WAITALL); 928 } while ((l == -1) && (errno == EINTR)); 929 930 if (l == -1) 931 break; 932 933 check_route(&xbuf, l); 934 935 } else if (is_hello_socket(pfd[i].fd) == 1) { 936 /* Receiving hello socket */ 937 recv_pdu(pfd[i].fd); 938 } else if (pfd[i].fd == command_socket) { 939 command_accept(command_socket); 940 } else if ((cs = is_command_socket(pfd[i].fd)) 941 != NULL) { 942 command_dispatch(cs); 943 } else { 944 /* ldp peer socket */ 945 p = get_ldp_peer_by_socket(pfd[i].fd); 946 if (p) 947 recv_session_pdu(p); 948 } 949 } else if(pfd[i].revents & POLLWRNORM) { 950 p = get_ldp_peer_by_socket(pfd[i].fd); 951 if (!p) 952 continue; 953 assert(p->state == LDP_PEER_CONNECTING); 954 if (getsockopt(pfd[i].fd, SOL_SOCKET, SO_ERROR, 955 &sock_error, &sock_error_size) != 0 || 956 sock_error != 0) { 957 ldp_peer_holddown(p); 958 sock_error = 0; 959 } else { 960 p->state = LDP_PEER_CONNECTED; 961 send_initialize(p); 962 } 963 } 964 } 965 966 for (int ri = 0; ri < replay_index; ri++) { 967 debugp("Replaying: PID %d, SEQ %d\n", 968 replay_rt[ri].m_rtm.rtm_pid, 969 replay_rt[ri].m_rtm.rtm_seq); 970 check_route(&replay_rt[ri], sizeof(struct rt_msg)); 971 } 972 replay_index = 0; 973 } /* for (;;) */ 974 } 975 976 void 977 new_peer_connection() 978 { 979 union sockunion peer_address, my_address; 980 struct in_addr *peer_ldp_id = NULL; 981 struct hello_info *hi; 982 int s; 983 984 s = accept(ls, &peer_address.sa, 985 & (socklen_t) { sizeof(union sockunion) } ); 986 if (s < 0) { 987 fatalp("accept: %s", strerror(errno)); 988 return; 989 } 990 991 if (getsockname(s, &my_address.sa, 992 & (socklen_t) { sizeof(union sockunion) } )) { 993 fatalp("new_peer_connection(): cannot getsockname\n"); 994 close(s); 995 return; 996 } 997 998 if (peer_address.sa.sa_family == AF_INET) 999 peer_address.sin.sin_port = 0; 1000 else if (peer_address.sa.sa_family == AF_INET6) 1001 peer_address.sin6.sin6_port = 0; 1002 else { 1003 fatalp("Unknown peer address family\n"); 1004 close(s); 1005 return; 1006 } 1007 1008 /* Already peered or in holddown ? */ 1009 if (get_ldp_peer(&peer_address.sa) != NULL) { 1010 close(s); 1011 return; 1012 } 1013 1014 warnp("Accepted a connection from %s\n", satos(&peer_address.sa)); 1015 1016 /* Verify if it should connect - XXX: no check for INET6 */ 1017 if (peer_address.sa.sa_family == AF_INET && 1018 ntohl(peer_address.sin.sin_addr.s_addr) < 1019 ntohl(my_address.sin.sin_addr.s_addr)) { 1020 fatalp("Peer %s: connect from lower ID\n", 1021 satos(&peer_address.sa)); 1022 close(s); 1023 return; 1024 } 1025 1026 /* Match hello info in order to get ldp_id */ 1027 SLIST_FOREACH(hi, &hello_info_head, infos) { 1028 if (sockaddr_cmp(&peer_address.sa, 1029 &hi->transport_address.sa) == 0) { 1030 peer_ldp_id = &hi->ldp_id; 1031 break; 1032 } 1033 } 1034 if (peer_ldp_id == NULL) { 1035 warnp("Got connection from %s, but no hello info exists\n", 1036 satos(&peer_address.sa)); 1037 close(s); 1038 return; 1039 } else 1040 ldp_peer_new(peer_ldp_id, &peer_address.sa, NULL, 1041 ldp_holddown_time, s); 1042 1043 } 1044 1045 void 1046 send_initialize(const struct ldp_peer * p) 1047 { 1048 struct init_tlv ti; 1049 1050 ti.type = htons(LDP_INITIALIZE); 1051 ti.length = htons(sizeof(struct init_tlv) - TLV_TYPE_LENGTH); 1052 ti.messageid = htonl(get_message_id()); 1053 ti.cs_type = htons(TLV_COMMON_SESSION); 1054 ti.cs_len = htons(CS_LEN); 1055 ti.cs_version = htons(LDP_VERSION); 1056 ti.cs_keepalive = htons(2 * ldp_keepalive_time); 1057 ti.cs_adpvlim = 0; 1058 ti.cs_maxpdulen = htons(MAX_PDU_SIZE); 1059 ti.cs_peeraddress.s_addr = p->ldp_id.s_addr; 1060 ti.cs_peeraddrspace = 0; 1061 1062 send_tlv(p, (struct tlv *) (void *) &ti); 1063 } 1064 1065 void 1066 keep_alive(const struct ldp_peer * p) 1067 { 1068 struct ka_tlv kt; 1069 1070 kt.type = htons(LDP_KEEPALIVE); 1071 kt.length = htons(sizeof(kt.messageid)); 1072 kt.messageid = htonl(get_message_id()); 1073 1074 send_tlv(p, (struct tlv *) (void *) &kt); 1075 } 1076 1077 /* 1078 * Process a message received from a peer 1079 */ 1080 void 1081 recv_session_pdu(struct ldp_peer * p) 1082 { 1083 struct ldp_pdu *rpdu; 1084 struct address_tlv *atlv; 1085 struct al_tlv *altlv; 1086 struct init_tlv *itlv; 1087 struct label_map_tlv *lmtlv; 1088 struct fec_tlv *fectlv; 1089 struct label_tlv *labeltlv; 1090 struct notification_tlv *nottlv; 1091 struct hello_info *hi; 1092 1093 int c; 1094 int32_t wo = 0; 1095 struct tlv *ttmp; 1096 unsigned char recvspace[MAX_PDU_SIZE]; 1097 1098 memset(recvspace, 0, MAX_PDU_SIZE); 1099 1100 do { 1101 c = recv(p->socket, (void *) recvspace, MAX_PDU_SIZE, MSG_PEEK); 1102 } while (c == -1 && errno == EINTR); 1103 1104 debugp("Ready to read %d bytes\n", c); 1105 1106 if (c < 1) { /* Session closed */ 1107 warnp("Error in connection with %s\n", inet_ntoa(p->ldp_id)); 1108 ldp_peer_holddown(p); 1109 return; 1110 } 1111 if (c > MAX_PDU_SIZE) { 1112 debugp("Incoming PDU size exceeds MAX_PDU_SIZE !\n"); 1113 return; 1114 } 1115 if (c < MIN_PDU_SIZE) { 1116 debugp("PDU too small received from peer %s\n", 1117 inet_ntoa(p->ldp_id)); 1118 return; 1119 } 1120 rpdu = (struct ldp_pdu *) recvspace; 1121 do { 1122 c = recv(p->socket, (void *) recvspace, 1123 ntohs(rpdu->length) + PDU_VER_LENGTH, MSG_WAITALL); 1124 } while (c == -1 && errno == EINTR); 1125 1126 /* sanity check */ 1127 if (check_recv_pdu(p, rpdu, c) != 0) 1128 return; 1129 1130 debugp("Read %d bytes, PDU size: %d bytes\n", c, ntohs(rpdu->length)); 1131 wo = sizeof(struct ldp_pdu); 1132 1133 while (wo + TLV_TYPE_LENGTH < (uint)c) { 1134 1135 ttmp = (struct tlv *) (&recvspace[wo]); 1136 1137 if ((ntohs(ttmp->type) != LDP_KEEPALIVE) && 1138 (ntohs(ttmp->type) != LDP_LABEL_MAPPING)) { 1139 debugp("Got Type: 0x%.4X (Length: %d) from %s\n", 1140 ntohs(ttmp->type), ntohs(ttmp->length), 1141 inet_ntoa(p->ldp_id)); 1142 } else 1143 debugp("Got Type: 0x%.4X (Length: %d) from %s\n", 1144 ntohs(ttmp->type), ntohs(ttmp->length), 1145 inet_ntoa(p->ldp_id)); 1146 1147 /* Should we get the message ? */ 1148 if (p->state != LDP_PEER_ESTABLISHED && 1149 ntohs(ttmp->type) != LDP_INITIALIZE && 1150 ntohs(ttmp->type) != LDP_KEEPALIVE && 1151 ntohs(ttmp->type) != LDP_NOTIFICATION) 1152 break; 1153 /* The big switch */ 1154 switch (ntohs(ttmp->type)) { 1155 case LDP_INITIALIZE: 1156 itlv = (struct init_tlv *)ttmp; 1157 /* Check size */ 1158 if (ntohs(itlv->length) < 1159 sizeof(struct init_tlv) - TLV_TYPE_LENGTH) { 1160 debugp("Bad size\n"); 1161 send_notification(p, 0, 1162 NOTIF_BAD_PDU_LEN | NOTIF_FATAL); 1163 ldp_peer_holddown(p); 1164 break; 1165 } 1166 /* Check version */ 1167 if (ntohs(itlv->cs_version) != LDP_VERSION) { 1168 debugp("Bad version"); 1169 send_notification(p, ntohl(itlv->messageid), 1170 NOTIF_BAD_LDP_VER | NOTIF_FATAL); 1171 ldp_peer_holddown(p); 1172 break; 1173 } 1174 /* Check if we got any hello from this one */ 1175 SLIST_FOREACH(hi, &hello_info_head, infos) 1176 if (hi->ldp_id.s_addr == rpdu->ldp_id.s_addr) 1177 break; 1178 if (hi == NULL) { 1179 debugp("No hello. Moving peer to holddown\n"); 1180 send_notification(p, ntohl(itlv->messageid), 1181 NOTIF_SESSION_REJECTED_NO_HELLO | NOTIF_FATAL); 1182 ldp_peer_holddown(p); 1183 break; 1184 } 1185 1186 if (!p->master) { 1187 send_initialize(p); 1188 keep_alive(p); 1189 } else { 1190 p->state = LDP_PEER_ESTABLISHED; 1191 p->established_t = time(NULL); 1192 keep_alive(p); 1193 1194 /* 1195 * Recheck here ldp id because we accepted 1196 * connection without knowing who is it for sure 1197 */ 1198 p->ldp_id.s_addr = rpdu->ldp_id.s_addr; 1199 1200 fatalp("LDP neighbour %s is UP\n", 1201 inet_ntoa(p->ldp_id)); 1202 mpls_add_ldp_peer(p); 1203 send_addresses(p); 1204 send_all_bindings(p); 1205 } 1206 break; 1207 case LDP_KEEPALIVE: 1208 if ((p->state == LDP_PEER_CONNECTED) && (!p->master)) { 1209 p->state = LDP_PEER_ESTABLISHED; 1210 p->established_t = time(NULL); 1211 fatalp("LDP neighbour %s is UP\n", 1212 inet_ntoa(p->ldp_id)); 1213 mpls_add_ldp_peer(p); 1214 send_addresses(p); 1215 send_all_bindings(p); 1216 } 1217 p->timeout = p->holdtime; 1218 break; 1219 case LDP_ADDRESS: 1220 /* Add peer addresses */ 1221 atlv = (struct address_tlv *) ttmp; 1222 altlv = (struct al_tlv *) (&atlv[1]); 1223 add_ifaddresses(p, altlv); 1224 /* 1225 * try to see if we have labels with null peer that 1226 * would match the new peer 1227 */ 1228 label_check_assoc(p); 1229 print_bounded_addresses(p); 1230 break; 1231 case LDP_ADDRESS_WITHDRAW: 1232 atlv = (struct address_tlv *) ttmp; 1233 altlv = (struct al_tlv *) (&atlv[1]); 1234 del_ifaddresses(p, altlv); 1235 break; 1236 case LDP_LABEL_MAPPING: 1237 lmtlv = (struct label_map_tlv *) ttmp; 1238 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1239 labeltlv = (struct label_tlv *)((unsigned char *)fectlv 1240 + ntohs(fectlv->length) + TLV_TYPE_LENGTH); 1241 map_label(p, fectlv, labeltlv); 1242 break; 1243 case LDP_LABEL_REQUEST: 1244 lmtlv = (struct label_map_tlv *) ttmp; 1245 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1246 switch (request_respond(p, lmtlv, fectlv)) { 1247 case LDP_E_BAD_FEC: 1248 send_notification(p, ntohl(lmtlv->messageid), 1249 NOTIF_UNKNOWN_TLV); 1250 break; 1251 case LDP_E_BAD_AF: 1252 send_notification(p, ntohl(lmtlv->messageid), 1253 NOTIF_UNSUPPORTED_AF); 1254 break; 1255 case LDP_E_NO_SUCH_ROUTE: 1256 send_notification(p, ntohl(lmtlv->messageid), 1257 NOTIF_NO_ROUTE); 1258 break; 1259 } 1260 break; 1261 case LDP_LABEL_WITHDRAW: 1262 lmtlv = (struct label_map_tlv *) ttmp; 1263 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1264 if (withdraw_label(p, fectlv) == LDP_E_OK) { 1265 /* Send RELEASE */ 1266 prepare_release(ttmp); 1267 send_tlv(p, ttmp); 1268 } 1269 break; 1270 case LDP_LABEL_RELEASE: 1271 /* 1272 * XXX: we need to make a timed queue... 1273 * For now I just assume peers are processing messages 1274 * correctly so I just ignore confirmations 1275 */ 1276 wo = -1; /* Ignore rest of message */ 1277 break; 1278 case LDP_LABEL_ABORT: 1279 /* XXX: For now I pretend I can process everything 1280 * RFC 5036, Section 3.5.9.1 1281 * If an LSR receives a Label Abort Request Message after it 1282 * has responded to the Label Request in question with a Label 1283 * Mapping message or a Notification message, it ignores the 1284 * abort request. 1285 */ 1286 wo = -1; 1287 break; 1288 case LDP_NOTIFICATION: 1289 nottlv = (struct notification_tlv *) ttmp; 1290 nottlv->st_code = ntohl(nottlv->st_code); 1291 fatalp("Got notification 0x%X from peer %s\n", 1292 nottlv->st_code, inet_ntoa(p->ldp_id)); 1293 if (nottlv->st_code >> 31) { 1294 fatalp("LDP peer %s signalized %s\n", 1295 inet_ntoa(p->ldp_id), 1296 NOTIF_STR[(nottlv->st_code << 1) >> 1]); 1297 ldp_peer_holddown(p); 1298 wo = -1; 1299 } 1300 break; 1301 case LDP_HELLO: 1302 /* No hellos should came on tcp session */ 1303 wo = -1; 1304 break; 1305 default: 1306 warnp("Unknown TLV received from %s\n", 1307 inet_ntoa(p->ldp_id)); 1308 debug_tlv(ttmp); 1309 wo = -1;/* discard the rest of the message */ 1310 break; 1311 } 1312 if (wo < 0) { 1313 debugp("Discarding the rest of the message\n"); 1314 break; 1315 } else { 1316 wo += ntohs(ttmp->length) + TLV_TYPE_LENGTH; 1317 debugp("WORKED ON %u bytes (Left %d)\n", wo, c - wo); 1318 } 1319 } /* while */ 1320 1321 } 1322 1323 /* Sends a pdu, tlv pair to a connected peer */ 1324 int 1325 send_message(const struct ldp_peer * p, const struct ldp_pdu * pdu, 1326 const struct tlv * t) 1327 { 1328 unsigned char sendspace[MAX_PDU_SIZE]; 1329 1330 /* Check if peer is connected */ 1331 switch (p->state) { 1332 case LDP_PEER_CONNECTED: 1333 case LDP_PEER_ESTABLISHED: 1334 break; 1335 default: 1336 return -1; 1337 } 1338 1339 /* Check length validity first */ 1340 if (ntohs(pdu->length) != 1341 ntohs(t->length) + TLV_TYPE_LENGTH + PDU_PAYLOAD_LENGTH) { 1342 fatalp("LDP: TLV - PDU incompability. Message discarded\n"); 1343 fatalp("LDP: TLV len %d - PDU len %d\n", ntohs(t->length), 1344 ntohs(pdu->length)); 1345 return -1; 1346 } 1347 if (ntohs(t->length) + PDU_VER_LENGTH > MAX_PDU_SIZE) { 1348 fatalp("Message to large discarded\n"); 1349 return -1; 1350 } 1351 /* Arrange them in a buffer and send */ 1352 memcpy(sendspace, pdu, sizeof(struct ldp_pdu)); 1353 memcpy(sendspace + sizeof(struct ldp_pdu), t, 1354 ntohs(t->length) + TLV_TYPE_LENGTH); 1355 1356 /* Report keepalives only for DEBUG */ 1357 if ((ntohs(t->type) != 0x201) && (ntohs(t->type) != 0x400)) { 1358 debugp("Sending message type 0x%.4X to %s (size: %d)\n", 1359 ntohs(t->type), inet_ntoa(p->ldp_id), ntohs(t->length)); 1360 } else 1361 /* downgraded from warnp to debugp for now */ 1362 debugp("Sending message type 0x%.4X to %s (size: %d)\n", 1363 ntohs(t->type), inet_ntoa(p->ldp_id), ntohs(t->length)); 1364 1365 /* Send it finally */ 1366 return send(p->socket, sendspace, 1367 ntohs(pdu->length) + PDU_VER_LENGTH, 0); 1368 } 1369 1370 /* 1371 * Encapsulates TLV into a PDU and sends it to a peer 1372 */ 1373 int 1374 send_tlv(const struct ldp_peer * p, const struct tlv * t) 1375 { 1376 struct ldp_pdu pdu; 1377 1378 pdu.version = htons(LDP_VERSION); 1379 inet_aton(LDP_ID, &pdu.ldp_id); 1380 pdu.label_space = 0; 1381 pdu.length = htons(ntohs(t->length) + TLV_TYPE_LENGTH + 1382 PDU_PAYLOAD_LENGTH); 1383 1384 return send_message(p, &pdu, t); 1385 } 1386 1387 1388 int 1389 send_addresses(const struct ldp_peer * p) 1390 { 1391 struct address_list_tlv *t; 1392 int ret; 1393 1394 t = build_address_list_tlv(); 1395 1396 ret = send_tlv(p, (struct tlv *) t); 1397 free(t); 1398 return ret; 1399 1400 } 1401