socketops.c revision 1.33
1 /* $NetBSD: socketops.c,v 1.33 2013/10/30 08:41:57 mrg 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 (at) 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 memset(&su, 0, sizeof su); 340 if (stype == AF_INET) { 341 su.sin.sin_len = sizeof(su.sin); 342 su.sin.sin_family = AF_INET; 343 su.sin.sin_addr.s_addr = htonl(INADDR_ANY); 344 su.sin.sin_port = htons(LDP_PORT); 345 } 346 #ifdef INET6 347 else if (stype == AF_INET6) { 348 su.sin6.sin6_len = sizeof(su.sin6); 349 su.sin6.sin6_family = AF_INET6; 350 su.sin6.sin6_addr = in6addr_any; 351 su.sin6.sin6_port = htons(LDP_PORT); 352 } 353 #endif 354 if (bind(s, &su.sa, su.sa.sa_len)) { 355 fatalp("bind_socket: %s\n", strerror(errno)); 356 return -1; 357 } 358 return 0; 359 } 360 361 /* Create / bind the TCP socket */ 362 int 363 create_listening_socket(void) 364 { 365 struct sockaddr_in sa; 366 int s; 367 368 sa.sin_len = sizeof(sa); 369 sa.sin_family = AF_INET; 370 sa.sin_port = htons(LDP_PORT); 371 sa.sin_addr.s_addr = htonl(INADDR_ANY); 372 373 s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); 374 if (s < 0) 375 return s; 376 if (bind(s, (struct sockaddr *) & sa, sizeof(sa))) { 377 fatalp("bind: %s", strerror(errno)); 378 close(s); 379 return -1; 380 } 381 if (listen(s, 10) == -1) { 382 fatalp("listen: %s", strerror(errno)); 383 close(s); 384 return -1; 385 } 386 /* if (set_tos(s) == -1) { 387 fatalp("set_tos: %s", strerror(errno)); 388 close(s); 389 return -1; 390 } 391 */ return s; 392 } 393 394 /* 395 * It's ugly. We need a function to pass all tlvs and create pdu but since I 396 * use UDP socket only to send hellos, I didn't bother 397 */ 398 void 399 send_hello(void) 400 { 401 struct hello_tlv *t; 402 struct common_hello_tlv *cht; 403 struct ldp_pdu *spdu; 404 struct transport_address_tlv *trtlv; 405 void *v; 406 struct sockaddr_in sadest; /* Destination ALL_ROUTERS */ 407 ssize_t sb = 0; /* sent bytes */ 408 struct ifaddrs *ifa, *ifb; 409 struct sockaddr_in *if_sa; 410 int ip4socket = -1; 411 uint lastifindex; 412 struct hello_socket *hs; 413 struct conf_interface *coif; 414 bool bad_tr_addr; 415 #ifdef INET6 416 struct sockaddr_in6 sadest6; 417 int ip6socket = -1; 418 #endif 419 420 #define BASIC_HELLO_MSG_SIZE (sizeof(struct ldp_pdu) + /* PDU */ \ 421 TLV_TYPE_LENGTH + MSGID_SIZE + /* Hello TLV */ \ 422 /* Common Hello TLV */ \ 423 sizeof(struct common_hello_tlv)) 424 #define GENERAL_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + \ 425 /* Transport Address */ \ 426 sizeof(struct transport_address_tlv) 427 #define IPV4_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + 4 + sizeof(struct in_addr) 428 #define IPV6_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + 4 + sizeof(struct in6_addr) 429 430 if ((v = calloc(1, GENERAL_HELLO_MSG_SIZE)) == NULL) { 431 fatalp("alloc problem in send_hello()\n"); 432 return; 433 } 434 435 spdu = (struct ldp_pdu *)((char *)v); 436 t = (struct hello_tlv *)(spdu + 1); 437 cht = &t->ch; /* Hello tlv struct includes CHT */ 438 trtlv = (struct transport_address_tlv *)(t + 1); 439 440 /* Prepare PDU envelope */ 441 spdu->version = htons(LDP_VERSION); 442 spdu->length = htons(IPV4_HELLO_MSG_SIZE - PDU_VER_LENGTH); 443 inet_aton(LDP_ID, &spdu->ldp_id); 444 445 /* Prepare Hello TLV */ 446 t->type = htons(LDP_HELLO); 447 t->length = htons(MSGID_SIZE + 448 sizeof(struct common_hello_tlv) + 449 IPV4_HELLO_MSG_SIZE - BASIC_HELLO_MSG_SIZE); 450 /* 451 * We used ID 0 instead of htonl(get_message_id()) because we've 452 * seen hellos from Cisco routers doing the same thing 453 */ 454 t->messageid = 0; 455 456 /* Prepare Common Hello attributes */ 457 cht->type = htons(TLV_COMMON_HELLO); 458 cht->length = htons(sizeof(cht->holdtime) + sizeof(cht->res)); 459 cht->holdtime = htons(ldp_holddown_time); 460 cht->res = 0; 461 462 /* 463 * Prepare Transport Address TLV RFC5036 says: "If this optional TLV 464 * is not present the IPv4 source address for the UDP packet carrying 465 * the Hello should be used." But we send it because everybody seems 466 * to do so 467 */ 468 trtlv->type = htons(TLV_IPV4_TRANSPORT); 469 trtlv->length = htons(sizeof(struct in_addr)); 470 /* trtlv->address will be set for each socket */ 471 472 /* Destination sockaddr */ 473 memset(&sadest, 0, sizeof(sadest)); 474 sadest.sin_len = sizeof(sadest); 475 sadest.sin_family = AF_INET; 476 sadest.sin_port = htons(LDP_PORT); 477 sadest.sin_addr.s_addr = htonl(INADDR_ALLRTRS_GROUP); 478 479 /* Find our socket */ 480 SLIST_FOREACH(hs, &hello_socket_head, listentry) 481 if (hs->type == AF_INET) { 482 ip4socket = hs->socket; 483 break; 484 } 485 assert(ip4socket >= 0); 486 487 if (getifaddrs(&ifa) == -1) { 488 free(v); 489 fatalp("Cannot enumerate interfaces\n"); 490 return; 491 } 492 493 lastifindex = UINT_MAX; 494 /* Loop all interfaces in order to send IPv4 hellos */ 495 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 496 if_sa = (struct sockaddr_in *) ifb->ifa_addr; 497 if (if_sa->sin_family != AF_INET || 498 (!(ifb->ifa_flags & IFF_UP)) || 499 (ifb->ifa_flags & IFF_LOOPBACK) || 500 (!(ifb->ifa_flags & IFF_MULTICAST)) || 501 is_passive_if(ifb->ifa_name) || 502 (ntohl(if_sa->sin_addr.s_addr) >> 24 == IN_LOOPBACKNET) || 503 lastifindex == if_nametoindex(ifb->ifa_name)) 504 continue; 505 506 /* Send only once per interface, using primary address */ 507 if (lastifindex == if_nametoindex(ifb->ifa_name)) 508 continue; 509 /* Check if there is transport address set for this interface */ 510 bad_tr_addr = false; 511 SLIST_FOREACH(coif, &coifs_head, iflist) 512 if (strncasecmp(coif->if_name, ifb->ifa_name, 513 IF_NAMESIZE) == 0 && 514 coif->tr_addr.s_addr != 0 && 515 coif->tr_addr.s_addr != if_sa->sin_addr.s_addr) 516 bad_tr_addr = true; 517 if (bad_tr_addr == true) 518 continue; 519 lastifindex = if_nametoindex(ifb->ifa_name); 520 521 if (setsockopt(ip4socket, IPPROTO_IP, IP_MULTICAST_IF, 522 &if_sa->sin_addr, sizeof(struct in_addr)) == -1) { 523 warnp("setsockopt failed: %s\n", strerror(errno)); 524 continue; 525 } 526 trtlv->address.ip4addr.s_addr = if_sa->sin_addr.s_addr; 527 528 /* Put it on the wire */ 529 sb = sendto(ip4socket, v, IPV4_HELLO_MSG_SIZE, 0, 530 (struct sockaddr *) & sadest, sizeof(sadest)); 531 if (sb < (ssize_t)(IPV4_HELLO_MSG_SIZE)) 532 fatalp("send: %s", strerror(errno)); 533 else 534 debugp("Sent (IPv4) %zd bytes on %s" 535 " (PDU: %d, Hello TLV: %d, CH: %d, TR: %d)\n", 536 sb, ifb->ifa_name, 537 ntohs(spdu->length), ntohs(t->length), 538 ntohs(cht->length), ntohs(trtlv->length)); 539 } 540 #ifdef INET6 541 /* Adjust lengths */ 542 spdu->length = htons(IPV6_HELLO_MSG_SIZE - PDU_VER_LENGTH); 543 t->length = htons(MSGID_SIZE + 544 sizeof(struct common_hello_tlv) + 545 IPV6_HELLO_MSG_SIZE - BASIC_HELLO_MSG_SIZE); 546 trtlv->length = htons(sizeof(struct in6_addr)); 547 trtlv->type = htons(TLV_IPV6_TRANSPORT); 548 549 /* Prepare destination sockaddr */ 550 memset(&sadest6, 0, sizeof(sadest6)); 551 sadest6.sin6_len = sizeof(sadest6); 552 sadest6.sin6_family = AF_INET6; 553 sadest6.sin6_port = htons(LDP_PORT); 554 sadest6.sin6_addr = in6addr_linklocal_allrouters; 555 556 SLIST_FOREACH(hs, &hello_socket_head, listentry) 557 if (hs->type == AF_INET6) { 558 ip6socket = hs->socket; 559 break; 560 } 561 562 lastifindex = UINT_MAX; 563 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 564 struct sockaddr_in6 * if_sa6 = 565 (struct sockaddr_in6 *) ifb->ifa_addr; 566 if (if_sa6->sin6_family != AF_INET6 || 567 (!(ifb->ifa_flags & IFF_UP)) || 568 (!(ifb->ifa_flags & IFF_MULTICAST)) || 569 (ifb->ifa_flags & IFF_LOOPBACK) || 570 is_passive_if(ifb->ifa_name) || 571 IN6_IS_ADDR_LOOPBACK(&if_sa6->sin6_addr)) 572 continue; 573 /* 574 * draft-ietf-mpls-ldp-ipv6-07 Section 5.1: 575 * Additionally, the link-local 576 * IPv6 address MUST be used as the source IP address in IPv6 577 * LDP Link Hellos. 578 */ 579 if (IN6_IS_ADDR_LINKLOCAL(&if_sa6->sin6_addr) == 0) 580 continue; 581 /* We should have only one LLADDR per interface, but... */ 582 if (lastifindex == if_nametoindex(ifb->ifa_name)) 583 continue; 584 lastifindex = if_nametoindex(ifb->ifa_name); 585 586 if (setsockopt(ip6socket, IPPROTO_IPV6, IPV6_MULTICAST_IF, 587 &lastifindex, sizeof(int)) == -1) { 588 fatalp("ssopt6 IPV6_MULTICAST_IF failed: %s for %s\n", 589 strerror(errno), ifb->ifa_name); 590 continue; 591 } 592 593 memcpy(&trtlv->address.ip6addr, &if_sa6->sin6_addr, 594 sizeof(struct in6_addr)); 595 596 /* Put it on the wire */ 597 sb = sendto(ip6socket, v, IPV6_HELLO_MSG_SIZE, 598 0, (struct sockaddr *)&sadest6, sizeof(sadest6)); 599 if (sb < (ssize_t)(IPV6_HELLO_MSG_SIZE)) 600 fatalp("send6: %s", strerror(errno)); 601 else 602 debugp("Sent (IPv6) %zd bytes on %s " 603 "(PDU: %d, Hello TLV: %d, CH: %d TR: %d)\n", 604 sb, ifb->ifa_name, htons(spdu->length), 605 htons(t->length), htons(cht->length), 606 htons(trtlv->length)); 607 } 608 #endif 609 freeifaddrs(ifa); 610 free(v); 611 } 612 613 int 614 get_message_id(void) 615 { 616 current_msg_id++; 617 return current_msg_id; 618 } 619 620 static int 621 get_local_addr(struct sockaddr_dl *sdl, struct in_addr *sin) 622 { 623 struct ifaddrs *ifa, *ifb; 624 struct sockaddr_in *sinet; 625 626 if (sdl == NULL) 627 return -1; 628 629 if (getifaddrs(&ifa) == -1) 630 return -1; 631 for (ifb = ifa; ifb; ifb = ifb->ifa_next) 632 if (ifb->ifa_addr->sa_family == AF_INET) { 633 if (if_nametoindex(ifb->ifa_name) != sdl->sdl_index) 634 continue; 635 sinet = (struct sockaddr_in*) ifb->ifa_addr; 636 sin->s_addr = sinet->sin_addr.s_addr; 637 freeifaddrs(ifa); 638 return 0; 639 } 640 freeifaddrs(ifa); 641 return -1; 642 } 643 644 /* Receive PDUs on Multicast UDP socket */ 645 void 646 recv_pdu(int sock) 647 { 648 struct ldp_pdu rpdu; 649 int c, i; 650 struct msghdr msg; 651 struct iovec iov[1]; 652 unsigned char recvspace[MAX_PDU_SIZE]; 653 struct hello_tlv *t; 654 union sockunion sender; 655 struct sockaddr_dl *sdl = NULL; 656 struct in_addr my_ldp_addr, local_addr; 657 struct cmsghdr *cmptr; 658 union { 659 struct cmsghdr cm; 660 char control[1024]; 661 } control_un; 662 663 memset(&msg, 0, sizeof(msg)); 664 msg.msg_control = control_un.control; 665 msg.msg_controllen = sizeof(control_un.control); 666 msg.msg_flags = 0; 667 msg.msg_name = &sender; 668 msg.msg_namelen = sizeof(sender); 669 iov[0].iov_base = recvspace; 670 iov[0].iov_len = sizeof(recvspace); 671 msg.msg_iov = iov; 672 msg.msg_iovlen = 1; 673 674 c = recvmsg(sock, &msg, MSG_WAITALL); 675 676 /* Check to see if this is larger than MIN_PDU_SIZE */ 677 if (c < MIN_PDU_SIZE) 678 return; 679 680 /* Read the PDU */ 681 i = get_pdu(recvspace, &rpdu); 682 683 debugp("recv_pdu(%d): PDU(size: %d) from: %s\n", sock, 684 c, satos(&sender.sa)); 685 686 /* We currently understand Version 1 */ 687 if (rpdu.version != LDP_VERSION) { 688 warnp("recv_pdu: Version mismatch\n"); 689 return; 690 } 691 692 /* Check if it's our hello */ 693 inet_aton(LDP_ID, &my_ldp_addr); 694 if (rpdu.ldp_id.s_addr == my_ldp_addr.s_addr) { 695 /* It should not be looped. We set MULTICAST_LOOP 0 */ 696 fatalp("Received our PDU. Ignoring it\n"); 697 return; 698 } 699 700 if (msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr) || 701 (msg.msg_flags & MSG_CTRUNC)) 702 local_addr.s_addr = my_ldp_addr.s_addr; 703 else { 704 for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL; 705 cmptr = CMSG_NXTHDR(&msg, cmptr)) 706 if (cmptr->cmsg_level == IPPROTO_IP && 707 cmptr->cmsg_type == IP_RECVIF) { 708 sdl = (struct sockaddr_dl *) CMSG_DATA(cmptr); 709 break; 710 } 711 if (get_local_addr(sdl, &local_addr) != 0) 712 local_addr.s_addr = my_ldp_addr.s_addr; 713 } 714 715 716 debugp("Read %d bytes from address %s Length: %.4d Version: %d\n", 717 c, inet_ntoa(rpdu.ldp_id), rpdu.length, rpdu.version); 718 719 /* Fill the TLV messages */ 720 t = get_hello_tlv(recvspace + i, c - i); 721 run_ldp_hello(&rpdu, t, &sender.sa, &local_addr, sock, may_connect); 722 } 723 724 void 725 send_hello_alarm(int unused) 726 { 727 struct ldp_peer *p, *ptmp; 728 struct hello_info *hi, *hinext; 729 time_t t = time(NULL); 730 int olderrno = errno; 731 732 if (may_connect == false) 733 may_connect = true; 734 /* Send hellos */ 735 if (!(t % ldp_hello_time)) 736 send_hello(); 737 738 /* Timeout -- */ 739 SLIST_FOREACH(p, &ldp_peer_head, peers) 740 p->timeout--; 741 742 /* Check for timeout */ 743 SLIST_FOREACH_SAFE(p, &ldp_peer_head, peers, ptmp) 744 if (p->timeout < 1) 745 switch (p->state) { 746 case LDP_PEER_HOLDDOWN: 747 debugp("LDP holddown expired for peer %s\n", 748 inet_ntoa(p->ldp_id)); 749 ldp_peer_delete(p); 750 break; 751 case LDP_PEER_ESTABLISHED: 752 case LDP_PEER_CONNECTED: 753 send_notification(p, 0, 754 NOTIF_FATAL|NOTIF_KEEP_ALIVE_TIMER_EXPIRED); 755 warnp("Keepalive expired for %s\n", 756 inet_ntoa(p->ldp_id)); 757 ldp_peer_holddown(p); 758 break; 759 } /* switch */ 760 761 /* send keepalives */ 762 if (!(t % ldp_keepalive_time)) { 763 SLIST_FOREACH(p, &ldp_peer_head, peers) 764 if (p->state == LDP_PEER_ESTABLISHED) { 765 debugp("Sending KeepAlive to %s\n", 766 inet_ntoa(p->ldp_id)); 767 keep_alive(p); 768 } 769 } 770 771 /* Decrement and Check hello keepalives */ 772 SLIST_FOREACH_SAFE(hi, &hello_info_head, infos, hinext) { 773 if (hi->keepalive != 0xFFFF) 774 hi->keepalive--; 775 if (hi->keepalive < 1) 776 SLIST_REMOVE(&hello_info_head, hi, hello_info, infos); 777 } 778 779 /* Set the alarm again and bail out */ 780 alarm(1); 781 errno = olderrno; 782 } 783 784 static void 785 bail_out(int x) 786 { 787 ldp_peer_holddown_all(); 788 flush_mpls_routes(); 789 exit(0); 790 } 791 792 static void 793 print_info(int x) 794 { 795 printf("Info for %s\n-------\n", LDP_ID); 796 printf("Neighbours:\n"); 797 show_neighbours(1, NULL); 798 printf("Bindings:\n"); 799 show_bindings(1, NULL); 800 printf("Labels:\n"); 801 show_labels(1, NULL); 802 printf("--------\n"); 803 } 804 805 /* 806 * The big poll that catches every single event 807 * on every socket. 808 */ 809 int 810 the_big_loop(void) 811 { 812 int sock_error; 813 uint32_t i; 814 socklen_t sock_error_size = sizeof(int); 815 struct ldp_peer *p; 816 struct com_sock *cs; 817 struct pollfd pfd[MAX_POLL_FDS]; 818 struct hello_socket *hs; 819 nfds_t pollsum; 820 821 assert(MAX_POLL_FDS > 5); 822 823 SLIST_INIT(&hello_info_head); 824 825 signal(SIGALRM, send_hello_alarm); 826 signal(SIGPIPE, SIG_IGN); 827 signal(SIGINT, bail_out); 828 signal(SIGTERM, bail_out); 829 signal(SIGINFO, print_info); 830 831 /* Send first hellos in 5 seconds. Avoid No hello notifications */ 832 may_connect = false; 833 alarm(5); 834 835 route_socket = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC); 836 setsockopt(route_socket, SOL_SOCKET, SO_USELOOPBACK, &(int){0}, 837 sizeof(int)); 838 839 sock_error = bind_current_routes(); 840 if (sock_error != LDP_E_OK) { 841 fatalp("Cannot get current routes\n"); 842 return sock_error; 843 } 844 845 for (;;) { 846 pfd[0].fd = ls; 847 pfd[0].events = POLLRDNORM; 848 pfd[0].revents = 0; 849 850 pfd[1].fd = route_socket; 851 pfd[1].events = POLLRDNORM; 852 pfd[1].revents = 0; 853 854 pfd[2].fd = command_socket; 855 pfd[2].events = POLLRDNORM; 856 pfd[2].revents = 0; 857 858 /* Hello sockets */ 859 pollsum = 3; 860 SLIST_FOREACH(hs, &hello_socket_head, listentry) { 861 pfd[pollsum].fd = hs->socket; 862 pfd[pollsum].events = POLLIN; 863 pfd[pollsum].revents = 0; 864 pollsum++; 865 } 866 867 /* Command sockets */ 868 for (i=0; i < MAX_COMMAND_SOCKETS; i++) 869 if (csockets[i].socket != -1) { 870 if (pollsum >= MAX_POLL_FDS) 871 break; 872 pfd[pollsum].fd = csockets[i].socket; 873 pfd[pollsum].events = POLLIN; 874 pfd[pollsum].revents = 0; 875 pollsum++; 876 } 877 878 /* LDP Peer sockets */ 879 SLIST_FOREACH(p, &ldp_peer_head, peers) { 880 if (p->socket < 1) 881 continue; 882 switch (p->state) { 883 case LDP_PEER_CONNECTED: 884 case LDP_PEER_ESTABLISHED: 885 if (pollsum >= MAX_POLL_FDS) 886 break; 887 pfd[pollsum].fd = p->socket; 888 pfd[pollsum].events = POLLRDNORM; 889 pfd[pollsum].revents = 0; 890 pollsum++; 891 break; 892 case LDP_PEER_CONNECTING: 893 if (pollsum >= MAX_POLL_FDS) 894 break; 895 pfd[pollsum].fd = p->socket; 896 pfd[pollsum].events = POLLWRNORM; 897 pfd[pollsum].revents = 0; 898 pollsum++; 899 break; 900 } 901 } 902 903 if (pollsum >= MAX_POLL_FDS) { 904 fatalp("Too many sockets. Increase MAX_POLL_FDS\n"); 905 return LDP_E_TOO_MANY_FDS; 906 } 907 if (poll(pfd, pollsum, INFTIM) < 0) { 908 if (errno != EINTR) 909 fatalp("poll: %s", strerror(errno)); 910 continue; 911 } 912 913 for (i = 0; i < pollsum; i++) { 914 if ((pfd[i].revents & POLLRDNORM) || 915 (pfd[i].revents & POLLIN)) { 916 if(pfd[i].fd == ls) 917 new_peer_connection(); 918 else if (pfd[i].fd == route_socket) { 919 struct rt_msg xbuf; 920 int l, rtmlen = sizeof(xbuf); 921 /* Read at least rtm_msglen */ 922 l = recv(route_socket, &xbuf, 923 sizeof(u_short), MSG_PEEK); 924 if (l == sizeof(u_short)) 925 rtmlen = xbuf.m_rtm.rtm_msglen; 926 do { 927 l = recv(route_socket, &xbuf, 928 rtmlen, MSG_WAITALL); 929 } while ((l == -1) && (errno == EINTR)); 930 931 if (l == -1) 932 break; 933 934 check_route(&xbuf, l); 935 936 } else if (is_hello_socket(pfd[i].fd) == 1) { 937 /* Receiving hello socket */ 938 recv_pdu(pfd[i].fd); 939 } else if (pfd[i].fd == command_socket) { 940 command_accept(command_socket); 941 } else if ((cs = is_command_socket(pfd[i].fd)) 942 != NULL) { 943 command_dispatch(cs); 944 } else { 945 /* ldp peer socket */ 946 p = get_ldp_peer_by_socket(pfd[i].fd); 947 if (p) 948 recv_session_pdu(p); 949 } 950 } else if(pfd[i].revents & POLLWRNORM) { 951 p = get_ldp_peer_by_socket(pfd[i].fd); 952 if (!p) 953 continue; 954 assert(p->state == LDP_PEER_CONNECTING); 955 if (getsockopt(pfd[i].fd, SOL_SOCKET, SO_ERROR, 956 &sock_error, &sock_error_size) != 0 || 957 sock_error != 0) { 958 ldp_peer_holddown(p); 959 sock_error = 0; 960 } else { 961 p->state = LDP_PEER_CONNECTED; 962 send_initialize(p); 963 } 964 } 965 } 966 967 for (int ri = 0; ri < replay_index; ri++) { 968 debugp("Replaying: PID %d, SEQ %d\n", 969 replay_rt[ri].m_rtm.rtm_pid, 970 replay_rt[ri].m_rtm.rtm_seq); 971 check_route(&replay_rt[ri], sizeof(struct rt_msg)); 972 } 973 replay_index = 0; 974 } /* for (;;) */ 975 } 976 977 void 978 new_peer_connection() 979 { 980 union sockunion peer_address, my_address; 981 struct in_addr *peer_ldp_id = NULL; 982 struct hello_info *hi; 983 int s; 984 985 s = accept(ls, &peer_address.sa, 986 & (socklen_t) { sizeof(union sockunion) } ); 987 if (s < 0) { 988 fatalp("accept: %s", strerror(errno)); 989 return; 990 } 991 992 if (getsockname(s, &my_address.sa, 993 & (socklen_t) { sizeof(union sockunion) } )) { 994 fatalp("new_peer_connection(): cannot getsockname\n"); 995 close(s); 996 return; 997 } 998 999 if (peer_address.sa.sa_family == AF_INET) 1000 peer_address.sin.sin_port = 0; 1001 else if (peer_address.sa.sa_family == AF_INET6) 1002 peer_address.sin6.sin6_port = 0; 1003 else { 1004 fatalp("Unknown peer address family\n"); 1005 close(s); 1006 return; 1007 } 1008 1009 /* Already peered or in holddown ? */ 1010 if (get_ldp_peer(&peer_address.sa) != NULL) { 1011 close(s); 1012 return; 1013 } 1014 1015 warnp("Accepted a connection from %s\n", satos(&peer_address.sa)); 1016 1017 /* Verify if it should connect - XXX: no check for INET6 */ 1018 if (peer_address.sa.sa_family == AF_INET && 1019 ntohl(peer_address.sin.sin_addr.s_addr) < 1020 ntohl(my_address.sin.sin_addr.s_addr)) { 1021 fatalp("Peer %s: connect from lower ID\n", 1022 satos(&peer_address.sa)); 1023 close(s); 1024 return; 1025 } 1026 1027 /* Match hello info in order to get ldp_id */ 1028 SLIST_FOREACH(hi, &hello_info_head, infos) { 1029 if (sockaddr_cmp(&peer_address.sa, 1030 &hi->transport_address.sa) == 0) { 1031 peer_ldp_id = &hi->ldp_id; 1032 break; 1033 } 1034 } 1035 if (peer_ldp_id == NULL) { 1036 warnp("Got connection from %s, but no hello info exists\n", 1037 satos(&peer_address.sa)); 1038 close(s); 1039 return; 1040 } else 1041 ldp_peer_new(peer_ldp_id, &peer_address.sa, NULL, 1042 ldp_holddown_time, s); 1043 1044 } 1045 1046 void 1047 send_initialize(const struct ldp_peer * p) 1048 { 1049 struct init_tlv ti; 1050 1051 ti.type = htons(LDP_INITIALIZE); 1052 ti.length = htons(sizeof(struct init_tlv) - TLV_TYPE_LENGTH); 1053 ti.messageid = htonl(get_message_id()); 1054 ti.cs_type = htons(TLV_COMMON_SESSION); 1055 ti.cs_len = htons(CS_LEN); 1056 ti.cs_version = htons(LDP_VERSION); 1057 ti.cs_keepalive = htons(2 * ldp_keepalive_time); 1058 ti.cs_adpvlim = 0; 1059 ti.cs_maxpdulen = htons(MAX_PDU_SIZE); 1060 ti.cs_peeraddress.s_addr = p->ldp_id.s_addr; 1061 ti.cs_peeraddrspace = 0; 1062 1063 send_tlv(p, (struct tlv *) (void *) &ti); 1064 } 1065 1066 void 1067 keep_alive(const struct ldp_peer * p) 1068 { 1069 struct ka_tlv kt; 1070 1071 kt.type = htons(LDP_KEEPALIVE); 1072 kt.length = htons(sizeof(kt.messageid)); 1073 kt.messageid = htonl(get_message_id()); 1074 1075 send_tlv(p, (struct tlv *) (void *) &kt); 1076 } 1077 1078 /* 1079 * Process a message received from a peer 1080 */ 1081 void 1082 recv_session_pdu(struct ldp_peer * p) 1083 { 1084 struct ldp_pdu *rpdu; 1085 struct address_tlv *atlv; 1086 struct al_tlv *altlv; 1087 struct init_tlv *itlv; 1088 struct label_map_tlv *lmtlv; 1089 struct fec_tlv *fectlv; 1090 struct label_tlv *labeltlv; 1091 struct notification_tlv *nottlv; 1092 struct hello_info *hi; 1093 1094 int c; 1095 int32_t wo = 0; 1096 struct tlv *ttmp; 1097 unsigned char recvspace[MAX_PDU_SIZE]; 1098 1099 memset(recvspace, 0, MAX_PDU_SIZE); 1100 1101 do { 1102 c = recv(p->socket, (void *) recvspace, MAX_PDU_SIZE, MSG_PEEK); 1103 } while (c == -1 && errno == EINTR); 1104 1105 debugp("Ready to read %d bytes\n", c); 1106 1107 if (c < 1) { /* Session closed */ 1108 warnp("Error in connection with %s\n", inet_ntoa(p->ldp_id)); 1109 ldp_peer_holddown(p); 1110 return; 1111 } 1112 if (c > MAX_PDU_SIZE) { 1113 debugp("Incoming PDU size exceeds MAX_PDU_SIZE !\n"); 1114 return; 1115 } 1116 if (c < MIN_PDU_SIZE) { 1117 debugp("PDU too small received from peer %s\n", 1118 inet_ntoa(p->ldp_id)); 1119 return; 1120 } 1121 rpdu = (struct ldp_pdu *) recvspace; 1122 do { 1123 c = recv(p->socket, (void *) recvspace, 1124 ntohs(rpdu->length) + PDU_VER_LENGTH, MSG_WAITALL); 1125 } while (c == -1 && errno == EINTR); 1126 1127 /* sanity check */ 1128 if (check_recv_pdu(p, rpdu, c) != 0) 1129 return; 1130 1131 debugp("Read %d bytes, PDU size: %d bytes\n", c, ntohs(rpdu->length)); 1132 wo = sizeof(struct ldp_pdu); 1133 1134 while (wo + TLV_TYPE_LENGTH < (uint)c) { 1135 1136 ttmp = (struct tlv *) (&recvspace[wo]); 1137 1138 if ((ntohs(ttmp->type) != LDP_KEEPALIVE) && 1139 (ntohs(ttmp->type) != LDP_LABEL_MAPPING)) { 1140 debugp("Got Type: 0x%.4X (Length: %d) from %s\n", 1141 ntohs(ttmp->type), ntohs(ttmp->length), 1142 inet_ntoa(p->ldp_id)); 1143 } else 1144 debugp("Got Type: 0x%.4X (Length: %d) from %s\n", 1145 ntohs(ttmp->type), ntohs(ttmp->length), 1146 inet_ntoa(p->ldp_id)); 1147 1148 /* Should we get the message ? */ 1149 if (p->state != LDP_PEER_ESTABLISHED && 1150 ntohs(ttmp->type) != LDP_INITIALIZE && 1151 ntohs(ttmp->type) != LDP_KEEPALIVE && 1152 ntohs(ttmp->type) != LDP_NOTIFICATION) 1153 break; 1154 /* The big switch */ 1155 switch (ntohs(ttmp->type)) { 1156 case LDP_INITIALIZE: 1157 itlv = (struct init_tlv *)ttmp; 1158 /* Check size */ 1159 if (ntohs(itlv->length) < 1160 sizeof(struct init_tlv) - TLV_TYPE_LENGTH) { 1161 debugp("Bad size\n"); 1162 send_notification(p, 0, 1163 NOTIF_BAD_PDU_LEN | NOTIF_FATAL); 1164 ldp_peer_holddown(p); 1165 break; 1166 } 1167 /* Check version */ 1168 if (ntohs(itlv->cs_version) != LDP_VERSION) { 1169 debugp("Bad version"); 1170 send_notification(p, ntohl(itlv->messageid), 1171 NOTIF_BAD_LDP_VER | NOTIF_FATAL); 1172 ldp_peer_holddown(p); 1173 break; 1174 } 1175 /* Check if we got any hello from this one */ 1176 SLIST_FOREACH(hi, &hello_info_head, infos) 1177 if (hi->ldp_id.s_addr == rpdu->ldp_id.s_addr) 1178 break; 1179 if (hi == NULL) { 1180 debugp("No hello. Moving peer to holddown\n"); 1181 send_notification(p, ntohl(itlv->messageid), 1182 NOTIF_SESSION_REJECTED_NO_HELLO | NOTIF_FATAL); 1183 ldp_peer_holddown(p); 1184 break; 1185 } 1186 1187 if (!p->master) { 1188 send_initialize(p); 1189 keep_alive(p); 1190 } else { 1191 p->state = LDP_PEER_ESTABLISHED; 1192 p->established_t = time(NULL); 1193 keep_alive(p); 1194 1195 /* 1196 * Recheck here ldp id because we accepted 1197 * connection without knowing who is it for sure 1198 */ 1199 p->ldp_id.s_addr = rpdu->ldp_id.s_addr; 1200 1201 fatalp("LDP neighbour %s is UP\n", 1202 inet_ntoa(p->ldp_id)); 1203 mpls_add_ldp_peer(p); 1204 send_addresses(p); 1205 send_all_bindings(p); 1206 } 1207 break; 1208 case LDP_KEEPALIVE: 1209 if ((p->state == LDP_PEER_CONNECTED) && (!p->master)) { 1210 p->state = LDP_PEER_ESTABLISHED; 1211 p->established_t = time(NULL); 1212 fatalp("LDP neighbour %s is UP\n", 1213 inet_ntoa(p->ldp_id)); 1214 mpls_add_ldp_peer(p); 1215 send_addresses(p); 1216 send_all_bindings(p); 1217 } 1218 p->timeout = p->holdtime; 1219 break; 1220 case LDP_ADDRESS: 1221 /* Add peer addresses */ 1222 atlv = (struct address_tlv *) ttmp; 1223 altlv = (struct al_tlv *) (&atlv[1]); 1224 add_ifaddresses(p, altlv); 1225 /* 1226 * try to see if we have labels with null peer that 1227 * would match the new peer 1228 */ 1229 label_check_assoc(p); 1230 print_bounded_addresses(p); 1231 break; 1232 case LDP_ADDRESS_WITHDRAW: 1233 atlv = (struct address_tlv *) ttmp; 1234 altlv = (struct al_tlv *) (&atlv[1]); 1235 del_ifaddresses(p, altlv); 1236 break; 1237 case LDP_LABEL_MAPPING: 1238 lmtlv = (struct label_map_tlv *) ttmp; 1239 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1240 labeltlv = (struct label_tlv *)((unsigned char *)fectlv 1241 + ntohs(fectlv->length) + TLV_TYPE_LENGTH); 1242 map_label(p, fectlv, labeltlv); 1243 break; 1244 case LDP_LABEL_REQUEST: 1245 lmtlv = (struct label_map_tlv *) ttmp; 1246 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1247 switch (request_respond(p, lmtlv, fectlv)) { 1248 case LDP_E_BAD_FEC: 1249 send_notification(p, ntohl(lmtlv->messageid), 1250 NOTIF_UNKNOWN_TLV); 1251 break; 1252 case LDP_E_BAD_AF: 1253 send_notification(p, ntohl(lmtlv->messageid), 1254 NOTIF_UNSUPPORTED_AF); 1255 break; 1256 case LDP_E_NO_SUCH_ROUTE: 1257 send_notification(p, ntohl(lmtlv->messageid), 1258 NOTIF_NO_ROUTE); 1259 break; 1260 } 1261 break; 1262 case LDP_LABEL_WITHDRAW: 1263 lmtlv = (struct label_map_tlv *) ttmp; 1264 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1265 if (withdraw_label(p, fectlv) == LDP_E_OK) { 1266 /* Send RELEASE */ 1267 prepare_release(ttmp); 1268 send_tlv(p, ttmp); 1269 } 1270 break; 1271 case LDP_LABEL_RELEASE: 1272 /* 1273 * XXX: we need to make a timed queue... 1274 * For now I just assume peers are processing messages 1275 * correctly so I just ignore confirmations 1276 */ 1277 wo = -1; /* Ignore rest of message */ 1278 break; 1279 case LDP_LABEL_ABORT: 1280 /* XXX: For now I pretend I can process everything 1281 * RFC 5036, Section 3.5.9.1 1282 * If an LSR receives a Label Abort Request Message after it 1283 * has responded to the Label Request in question with a Label 1284 * Mapping message or a Notification message, it ignores the 1285 * abort request. 1286 */ 1287 wo = -1; 1288 break; 1289 case LDP_NOTIFICATION: 1290 nottlv = (struct notification_tlv *) ttmp; 1291 nottlv->st_code = ntohl(nottlv->st_code); 1292 fatalp("Got notification 0x%X from peer %s\n", 1293 nottlv->st_code, inet_ntoa(p->ldp_id)); 1294 if (nottlv->st_code >> 31) { 1295 fatalp("LDP peer %s signalized %s\n", 1296 inet_ntoa(p->ldp_id), 1297 NOTIF_STR[(nottlv->st_code << 1) >> 1]); 1298 ldp_peer_holddown(p); 1299 wo = -1; 1300 } 1301 break; 1302 case LDP_HELLO: 1303 /* No hellos should came on tcp session */ 1304 wo = -1; 1305 break; 1306 default: 1307 warnp("Unknown TLV received from %s\n", 1308 inet_ntoa(p->ldp_id)); 1309 debug_tlv(ttmp); 1310 wo = -1;/* discard the rest of the message */ 1311 break; 1312 } 1313 if (wo < 0) { 1314 debugp("Discarding the rest of the message\n"); 1315 break; 1316 } else { 1317 wo += ntohs(ttmp->length) + TLV_TYPE_LENGTH; 1318 debugp("WORKED ON %u bytes (Left %d)\n", wo, c - wo); 1319 } 1320 } /* while */ 1321 1322 } 1323 1324 /* Sends a pdu, tlv pair to a connected peer */ 1325 int 1326 send_message(const struct ldp_peer * p, const struct ldp_pdu * pdu, 1327 const struct tlv * t) 1328 { 1329 unsigned char sendspace[MAX_PDU_SIZE]; 1330 1331 /* Check if peer is connected */ 1332 switch (p->state) { 1333 case LDP_PEER_CONNECTED: 1334 case LDP_PEER_ESTABLISHED: 1335 break; 1336 default: 1337 return -1; 1338 } 1339 1340 /* Check length validity first */ 1341 if (ntohs(pdu->length) != 1342 ntohs(t->length) + TLV_TYPE_LENGTH + PDU_PAYLOAD_LENGTH) { 1343 fatalp("LDP: TLV - PDU incompability. Message discarded\n"); 1344 fatalp("LDP: TLV len %d - PDU len %d\n", ntohs(t->length), 1345 ntohs(pdu->length)); 1346 return -1; 1347 } 1348 if (ntohs(t->length) + PDU_VER_LENGTH > MAX_PDU_SIZE) { 1349 fatalp("Message to large discarded\n"); 1350 return -1; 1351 } 1352 /* Arrange them in a buffer and send */ 1353 memcpy(sendspace, pdu, sizeof(struct ldp_pdu)); 1354 memcpy(sendspace + sizeof(struct ldp_pdu), t, 1355 ntohs(t->length) + TLV_TYPE_LENGTH); 1356 1357 /* Report keepalives only for DEBUG */ 1358 if ((ntohs(t->type) != 0x201) && (ntohs(t->type) != 0x400)) { 1359 debugp("Sending message type 0x%.4X to %s (size: %d)\n", 1360 ntohs(t->type), inet_ntoa(p->ldp_id), ntohs(t->length)); 1361 } else 1362 /* downgraded from warnp to debugp for now */ 1363 debugp("Sending message type 0x%.4X to %s (size: %d)\n", 1364 ntohs(t->type), inet_ntoa(p->ldp_id), ntohs(t->length)); 1365 1366 /* Send it finally */ 1367 return send(p->socket, sendspace, 1368 ntohs(pdu->length) + PDU_VER_LENGTH, 0); 1369 } 1370 1371 /* 1372 * Encapsulates TLV into a PDU and sends it to a peer 1373 */ 1374 int 1375 send_tlv(const struct ldp_peer * p, const struct tlv * t) 1376 { 1377 struct ldp_pdu pdu; 1378 1379 pdu.version = htons(LDP_VERSION); 1380 inet_aton(LDP_ID, &pdu.ldp_id); 1381 pdu.label_space = 0; 1382 pdu.length = htons(ntohs(t->length) + TLV_TYPE_LENGTH + 1383 PDU_PAYLOAD_LENGTH); 1384 1385 return send_message(p, &pdu, t); 1386 } 1387 1388 1389 int 1390 send_addresses(const struct ldp_peer * p) 1391 { 1392 struct address_list_tlv *t; 1393 int ret; 1394 1395 t = build_address_list_tlv(); 1396 1397 ret = send_tlv(p, (struct tlv *) t); 1398 free(t); 1399 return ret; 1400 1401 } 1402
Indexes created Mon Sep 22 13:09:51 GMT 2025