1 /* $NetBSD: socketops.c,v 1.35 2020/04/22 23:53:27 joerg 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 struct hello_info_head hello_info_head; 65 static SLIST_HEAD(,hello_socket) hello_socket_head; 66 67 int ls; /* TCP listening socket on port 646 */ 68 int route_socket; /* used to see when a route is added/deleted */ 69 int command_socket; /* Listening socket for interface command */ 70 int current_msg_id = 0x233; 71 int command_port = LDP_COMMAND_PORT; 72 extern int replay_index; 73 extern struct rt_msg replay_rt[REPLAY_MAX]; 74 extern struct com_sock csockets[MAX_COMMAND_SOCKETS]; 75 76 int ldp_hello_time = LDP_HELLO_TIME; 77 int ldp_keepalive_time = LDP_KEEPALIVE_TIME; 78 int ldp_holddown_time = LDP_HOLDTIME; 79 int no_default_route = 1; 80 int loop_detection = 0; 81 bool may_connect; 82 83 void recv_pdu(int); 84 void send_hello_alarm(int); 85 __dead static void bail_out(int); 86 static void print_info(int); 87 static int bind_socket(int s, int stype); 88 static int set_tos(int); 89 static int socket_reuse_port(int); 90 static int get_local_addr(struct sockaddr_dl *, struct in_addr *); 91 static int is_hello_socket(int); 92 static int is_passive_if(const char *if_name); 93 94 int 95 create_hello_sockets() 96 { 97 struct ip_mreq mcast_addr; 98 int s, joined_groups; 99 struct ifaddrs *ifa, *ifb; 100 uint lastifindex; 101 #ifdef INET6 102 struct ipv6_mreq mcast_addr6; 103 struct sockaddr_in6 *if_sa6; 104 #endif 105 struct hello_socket *hs; 106 107 SLIST_INIT(&hello_socket_head); 108 109 s = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); 110 if (s < 0) 111 return s; 112 debugp("INET4 socket created (%d)\n", s); 113 /* 114 * RFC5036 specifies we should listen to all subnet routers multicast 115 * group 116 */ 117 mcast_addr.imr_multiaddr.s_addr = htonl(INADDR_ALLRTRS_GROUP); 118 119 if (socket_reuse_port(s) < 0) 120 goto chs_error; 121 /* Bind it to port 646 */ 122 if (bind_socket(s, AF_INET) == -1) { 123 warnp("Cannot bind INET hello socket\n"); 124 goto chs_error; 125 } 126 127 /* We don't need to receive back our messages */ 128 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &(u_char){0}, 129 sizeof(u_char)) == -1) { 130 fatalp("INET setsockopt IP_MCAST_LOOP: %s\n", strerror(errno)); 131 goto chs_error; 132 } 133 /* Finally join the group on all interfaces */ 134 if (getifaddrs(&ifa) == -1) { 135 fatalp("Cannot iterate interfaces\n"); 136 return -1; 137 } 138 lastifindex = UINT_MAX; 139 joined_groups = 0; 140 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 141 struct sockaddr_in *if_sa = (struct sockaddr_in *) ifb->ifa_addr; 142 if (if_sa->sin_family != AF_INET || (!(ifb->ifa_flags & IFF_UP)) || 143 (ifb->ifa_flags & IFF_LOOPBACK) || 144 (!(ifb->ifa_flags & IFF_MULTICAST)) || 145 (ntohl(if_sa->sin_addr.s_addr) >> 24 == IN_LOOPBACKNET) || 146 is_passive_if(ifb->ifa_name) || 147 lastifindex == if_nametoindex(ifb->ifa_name)) 148 continue; 149 lastifindex = if_nametoindex(ifb->ifa_name); 150 151 mcast_addr.imr_interface.s_addr = if_sa->sin_addr.s_addr; 152 debugp("Join IPv4 mcast on %s\n", ifb->ifa_name); 153 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *) &mcast_addr, 154 sizeof(mcast_addr)) == -1) { 155 fatalp("setsockopt ADD_MEMBER: %s\n", strerror(errno)); 156 goto chs_error; 157 } 158 joined_groups++; 159 if (joined_groups == IP_MAX_MEMBERSHIPS) { 160 warnp("Maximum group memberships reached for INET socket\n"); 161 break; 162 } 163 } 164 /* TTL:1 for IPv4 */ 165 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &(int){1}, 166 sizeof(int)) == -1) { 167 fatalp("set mcast ttl: %s\n", strerror(errno)); 168 goto chs_error; 169 } 170 /* TOS :0xc0 for IPv4 */ 171 if (set_tos(s) == -1) { 172 fatalp("set_tos: %s", strerror(errno)); 173 goto chs_error; 174 } 175 /* we need to get the input interface for message processing */ 176 if (setsockopt(s, IPPROTO_IP, IP_RECVIF, &(uint32_t){1}, 177 sizeof(uint32_t)) == -1) { 178 fatalp("Cannot set IP_RECVIF\n"); 179 goto chs_error; 180 } 181 182 hs = (struct hello_socket *)malloc(sizeof(*hs)); 183 if (hs == NULL) { 184 fatalp("Cannot alloc hello_socket structure\n"); 185 goto chs_error; 186 } 187 hs->type = AF_INET; 188 hs->socket = s; 189 SLIST_INSERT_HEAD(&hello_socket_head, hs, listentry); 190 191 #ifdef INET6 192 /* 193 * Now we do the same for IPv6 194 */ 195 s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP); 196 if (s < 0) { 197 fatalp("Cannot create INET6 socket\n"); 198 return -1; 199 } 200 debugp("INET6 socket created (%d)\n", s); 201 202 if (socket_reuse_port(s) < 0) 203 goto chs_error; 204 205 if (bind_socket(s, AF_INET6) == -1) { 206 fatalp("Cannot bind INET6 hello socket\n"); 207 goto chs_error; 208 } 209 210 if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, 211 &(uint){0}, sizeof(uint)) == -1) { 212 fatalp("INET6 setsocketopt IP_MCAST_LOOP: %s\n", 213 strerror(errno)); 214 goto chs_error; 215 } 216 217 lastifindex = UINT_MAX; 218 mcast_addr6.ipv6mr_multiaddr = in6addr_linklocal_allrouters; 219 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 220 if_sa6 = (struct sockaddr_in6 *) ifb->ifa_addr; 221 if (if_sa6->sin6_family != AF_INET6 || 222 (!(ifb->ifa_flags & IFF_UP)) || 223 (!(ifb->ifa_flags & IFF_MULTICAST)) || 224 (ifb->ifa_flags & IFF_LOOPBACK) || 225 is_passive_if(ifb->ifa_name) || 226 IN6_IS_ADDR_LOOPBACK(&if_sa6->sin6_addr)) 227 continue; 228 /* 229 * draft-ietf-mpls-ldp-ipv6-07 Section 5.1: 230 * Additionally, the link-local 231 * IPv6 address MUST be used as the source IP address in IPv6 232 * LDP Link Hellos. 233 */ 234 if (IN6_IS_ADDR_LINKLOCAL(&if_sa6->sin6_addr) == 0) 235 continue; 236 /* We should have only one LLADDR per interface, but... */ 237 if (lastifindex == if_nametoindex(ifb->ifa_name)) 238 continue; 239 mcast_addr6.ipv6mr_interface = lastifindex = 240 if_nametoindex(ifb->ifa_name); 241 242 debugp("Join IPv6 mcast on %s\n", ifb->ifa_name); 243 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, 244 (char *)&mcast_addr6, sizeof(mcast_addr6)) == -1) { 245 fatalp("INET6 setsockopt JOIN: %s\n", strerror(errno)); 246 goto chs_error; 247 } 248 } 249 freeifaddrs(ifa); 250 251 /* TTL: 255 for IPv6 - draft-ietf-mpls-ldp-ipv6-07 Section 9 */ 252 if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 253 &(int){255}, sizeof(int)) == -1) { 254 fatalp("set mcast hops: %s\n", strerror(errno)); 255 goto chs_error; 256 } 257 if (setsockopt(s, IPPROTO_IPV6, IPV6_RECVPKTINFO, 258 &(uint32_t){1}, sizeof(uint32_t)) == -1) 259 goto chs_error; 260 261 hs = (struct hello_socket *)malloc(sizeof(*hs)); 262 if (hs == NULL) { 263 fatalp("Memory alloc problem: hs\n"); 264 goto chs_error; 265 } 266 267 hs->type = AF_INET6; 268 hs->socket = s; 269 SLIST_INSERT_HEAD(&hello_socket_head, hs, listentry); 270 #endif 271 return 0; 272 chs_error: 273 close(s); 274 return -1; 275 } 276 277 /* Check if parameter is a hello socket */ 278 int 279 is_hello_socket(int s) 280 { 281 struct hello_socket *hs; 282 283 SLIST_FOREACH(hs, &hello_socket_head, listentry) 284 if (hs->socket == s) 285 return 1; 286 return 0; 287 } 288 289 /* Check if interface is passive */ 290 static int 291 is_passive_if(const char *if_name) 292 { 293 struct conf_interface *coif; 294 295 SLIST_FOREACH(coif, &coifs_head, iflist) 296 if (strncasecmp(if_name, coif->if_name, IF_NAMESIZE) == 0 && 297 coif->passive != 0) 298 return 1; 299 return 0; 300 } 301 302 /* Sets the TTL to 1 as we don't want to transmit outside this subnet */ 303 int 304 set_ttl(int s) 305 { 306 int ret; 307 if ((ret = setsockopt(s, IPPROTO_IP, IP_TTL, &(int){1}, sizeof(int))) 308 == -1) 309 fatalp("set_ttl: %s", strerror(errno)); 310 return ret; 311 } 312 313 /* Sets TOS to 0xc0 aka IP Precedence 6 */ 314 static int 315 set_tos(int s) 316 { 317 int ret; 318 if ((ret = setsockopt(s, IPPROTO_IP, IP_TOS, &(int){0xc0}, 319 sizeof(int))) == -1) 320 fatalp("set_tos: %s", strerror(errno)); 321 return ret; 322 } 323 324 static int 325 socket_reuse_port(int s) 326 { 327 int ret; 328 if ((ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &(int){1}, 329 sizeof(int))) == -1) 330 fatalp("socket_reuse_port: %s", strerror(errno)); 331 return ret; 332 } 333 334 /* binds an UDP socket */ 335 static int 336 bind_socket(int s, int stype) 337 { 338 union sockunion su; 339 340 assert (stype == AF_INET || stype == AF_INET6); 341 342 memset(&su, 0, sizeof su); 343 if (stype == AF_INET) { 344 su.sin.sin_len = sizeof(su.sin); 345 su.sin.sin_family = AF_INET; 346 su.sin.sin_addr.s_addr = htonl(INADDR_ANY); 347 su.sin.sin_port = htons(LDP_PORT); 348 } 349 #ifdef INET6 350 else if (stype == AF_INET6) { 351 su.sin6.sin6_len = sizeof(su.sin6); 352 su.sin6.sin6_family = AF_INET6; 353 su.sin6.sin6_addr = in6addr_any; 354 su.sin6.sin6_port = htons(LDP_PORT); 355 } 356 #endif 357 if (bind(s, &su.sa, su.sa.sa_len)) { 358 fatalp("bind_socket: %s\n", strerror(errno)); 359 return -1; 360 } 361 return 0; 362 } 363 364 /* Create / bind the TCP socket */ 365 int 366 create_listening_socket(void) 367 { 368 struct sockaddr_in sa; 369 int s; 370 371 sa.sin_len = sizeof(sa); 372 sa.sin_family = AF_INET; 373 sa.sin_port = htons(LDP_PORT); 374 sa.sin_addr.s_addr = htonl(INADDR_ANY); 375 376 s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); 377 if (s < 0) 378 return s; 379 if (bind(s, (struct sockaddr *) & sa, sizeof(sa))) { 380 fatalp("bind: %s", strerror(errno)); 381 close(s); 382 return -1; 383 } 384 if (listen(s, 10) == -1) { 385 fatalp("listen: %s", strerror(errno)); 386 close(s); 387 return -1; 388 } 389 /* if (set_tos(s) == -1) { 390 fatalp("set_tos: %s", strerror(errno)); 391 close(s); 392 return -1; 393 } 394 */ return s; 395 } 396 397 /* 398 * It's ugly. We need a function to pass all tlvs and create pdu but since I 399 * use UDP socket only to send hellos, I didn't bother 400 */ 401 void 402 send_hello(void) 403 { 404 struct hello_tlv *t; 405 struct common_hello_tlv *cht; 406 struct ldp_pdu *spdu; 407 struct transport_address_tlv *trtlv; 408 void *v; 409 struct sockaddr_in sadest; /* Destination ALL_ROUTERS */ 410 ssize_t sb = 0; /* sent bytes */ 411 struct ifaddrs *ifa, *ifb; 412 struct sockaddr_in *if_sa; 413 int ip4socket = -1; 414 uint lastifindex; 415 struct hello_socket *hs; 416 struct conf_interface *coif; 417 bool bad_tr_addr; 418 #ifdef INET6 419 struct sockaddr_in6 sadest6; 420 int ip6socket = -1; 421 #endif 422 423 #define BASIC_HELLO_MSG_SIZE (sizeof(struct ldp_pdu) + /* PDU */ \ 424 TLV_TYPE_LENGTH + MSGID_SIZE + /* Hello TLV */ \ 425 /* Common Hello TLV */ \ 426 sizeof(struct common_hello_tlv)) 427 #define GENERAL_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + \ 428 /* Transport Address */ \ 429 sizeof(struct transport_address_tlv) 430 #define IPV4_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + 4 + sizeof(struct in_addr) 431 #define IPV6_HELLO_MSG_SIZE BASIC_HELLO_MSG_SIZE + 4 + sizeof(struct in6_addr) 432 433 if ((v = calloc(1, GENERAL_HELLO_MSG_SIZE)) == NULL) { 434 fatalp("alloc problem in send_hello()\n"); 435 return; 436 } 437 438 spdu = (struct ldp_pdu *)((char *)v); 439 t = (struct hello_tlv *)(spdu + 1); 440 cht = &t->ch; /* Hello tlv struct includes CHT */ 441 trtlv = (struct transport_address_tlv *)(t + 1); 442 443 /* Prepare PDU envelope */ 444 spdu->version = htons(LDP_VERSION); 445 spdu->length = htons(IPV4_HELLO_MSG_SIZE - PDU_VER_LENGTH); 446 inet_aton(LDP_ID, &spdu->ldp_id); 447 448 /* Prepare Hello TLV */ 449 t->type = htons(LDP_HELLO); 450 t->length = htons(MSGID_SIZE + 451 sizeof(struct common_hello_tlv) + 452 IPV4_HELLO_MSG_SIZE - BASIC_HELLO_MSG_SIZE); 453 /* 454 * We used ID 0 instead of htonl(get_message_id()) because we've 455 * seen hellos from Cisco routers doing the same thing 456 */ 457 t->messageid = 0; 458 459 /* Prepare Common Hello attributes */ 460 cht->type = htons(TLV_COMMON_HELLO); 461 cht->length = htons(sizeof(cht->holdtime) + sizeof(cht->res)); 462 cht->holdtime = htons(ldp_holddown_time); 463 cht->res = 0; 464 465 /* 466 * Prepare Transport Address TLV RFC5036 says: "If this optional TLV 467 * is not present the IPv4 source address for the UDP packet carrying 468 * the Hello should be used." But we send it because everybody seems 469 * to do so 470 */ 471 trtlv->type = htons(TLV_IPV4_TRANSPORT); 472 trtlv->length = htons(sizeof(struct in_addr)); 473 /* trtlv->address will be set for each socket */ 474 475 /* Destination sockaddr */ 476 memset(&sadest, 0, sizeof(sadest)); 477 sadest.sin_len = sizeof(sadest); 478 sadest.sin_family = AF_INET; 479 sadest.sin_port = htons(LDP_PORT); 480 sadest.sin_addr.s_addr = htonl(INADDR_ALLRTRS_GROUP); 481 482 /* Find our socket */ 483 SLIST_FOREACH(hs, &hello_socket_head, listentry) 484 if (hs->type == AF_INET) { 485 ip4socket = hs->socket; 486 break; 487 } 488 assert(ip4socket >= 0); 489 490 if (getifaddrs(&ifa) == -1) { 491 free(v); 492 fatalp("Cannot enumerate interfaces\n"); 493 return; 494 } 495 496 lastifindex = UINT_MAX; 497 /* Loop all interfaces in order to send IPv4 hellos */ 498 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 499 if_sa = (struct sockaddr_in *) ifb->ifa_addr; 500 if (if_sa->sin_family != AF_INET || 501 (!(ifb->ifa_flags & IFF_UP)) || 502 (ifb->ifa_flags & IFF_LOOPBACK) || 503 (!(ifb->ifa_flags & IFF_MULTICAST)) || 504 is_passive_if(ifb->ifa_name) || 505 (ntohl(if_sa->sin_addr.s_addr) >> 24 == IN_LOOPBACKNET) || 506 lastifindex == if_nametoindex(ifb->ifa_name)) 507 continue; 508 509 /* Send only once per interface, using primary address */ 510 if (lastifindex == if_nametoindex(ifb->ifa_name)) 511 continue; 512 /* Check if there is transport address set for this interface */ 513 bad_tr_addr = false; 514 SLIST_FOREACH(coif, &coifs_head, iflist) 515 if (strncasecmp(coif->if_name, ifb->ifa_name, 516 IF_NAMESIZE) == 0 && 517 coif->tr_addr.s_addr != 0 && 518 coif->tr_addr.s_addr != if_sa->sin_addr.s_addr) 519 bad_tr_addr = true; 520 if (bad_tr_addr == true) 521 continue; 522 lastifindex = if_nametoindex(ifb->ifa_name); 523 524 if (setsockopt(ip4socket, IPPROTO_IP, IP_MULTICAST_IF, 525 &if_sa->sin_addr, sizeof(struct in_addr)) == -1) { 526 warnp("setsockopt failed: %s\n", strerror(errno)); 527 continue; 528 } 529 trtlv->address.ip4addr.s_addr = if_sa->sin_addr.s_addr; 530 531 /* Put it on the wire */ 532 sb = sendto(ip4socket, v, IPV4_HELLO_MSG_SIZE, 0, 533 (struct sockaddr *) & sadest, sizeof(sadest)); 534 if (sb < (ssize_t)(IPV4_HELLO_MSG_SIZE)) 535 fatalp("send: %s", strerror(errno)); 536 else 537 debugp("Sent (IPv4) %zd bytes on %s" 538 " (PDU: %d, Hello TLV: %d, CH: %d, TR: %d)\n", 539 sb, ifb->ifa_name, 540 ntohs(spdu->length), ntohs(t->length), 541 ntohs(cht->length), ntohs(trtlv->length)); 542 } 543 #ifdef INET6 544 /* Adjust lengths */ 545 spdu->length = htons(IPV6_HELLO_MSG_SIZE - PDU_VER_LENGTH); 546 t->length = htons(MSGID_SIZE + 547 sizeof(struct common_hello_tlv) + 548 IPV6_HELLO_MSG_SIZE - BASIC_HELLO_MSG_SIZE); 549 trtlv->length = htons(sizeof(struct in6_addr)); 550 trtlv->type = htons(TLV_IPV6_TRANSPORT); 551 552 /* Prepare destination sockaddr */ 553 memset(&sadest6, 0, sizeof(sadest6)); 554 sadest6.sin6_len = sizeof(sadest6); 555 sadest6.sin6_family = AF_INET6; 556 sadest6.sin6_port = htons(LDP_PORT); 557 sadest6.sin6_addr = in6addr_linklocal_allrouters; 558 559 SLIST_FOREACH(hs, &hello_socket_head, listentry) 560 if (hs->type == AF_INET6) { 561 ip6socket = hs->socket; 562 break; 563 } 564 565 lastifindex = UINT_MAX; 566 for (ifb = ifa; ifb; ifb = ifb->ifa_next) { 567 struct sockaddr_in6 * if_sa6 = 568 (struct sockaddr_in6 *) ifb->ifa_addr; 569 if (if_sa6->sin6_family != AF_INET6 || 570 (!(ifb->ifa_flags & IFF_UP)) || 571 (!(ifb->ifa_flags & IFF_MULTICAST)) || 572 (ifb->ifa_flags & IFF_LOOPBACK) || 573 is_passive_if(ifb->ifa_name) || 574 IN6_IS_ADDR_LOOPBACK(&if_sa6->sin6_addr)) 575 continue; 576 /* 577 * draft-ietf-mpls-ldp-ipv6-07 Section 5.1: 578 * Additionally, the link-local 579 * IPv6 address MUST be used as the source IP address in IPv6 580 * LDP Link Hellos. 581 */ 582 if (IN6_IS_ADDR_LINKLOCAL(&if_sa6->sin6_addr) == 0) 583 continue; 584 /* We should have only one LLADDR per interface, but... */ 585 if (lastifindex == if_nametoindex(ifb->ifa_name)) 586 continue; 587 lastifindex = if_nametoindex(ifb->ifa_name); 588 589 if (setsockopt(ip6socket, IPPROTO_IPV6, IPV6_MULTICAST_IF, 590 &lastifindex, sizeof(int)) == -1) { 591 fatalp("ssopt6 IPV6_MULTICAST_IF failed: %s for %s\n", 592 strerror(errno), ifb->ifa_name); 593 continue; 594 } 595 596 memcpy(&trtlv->address.ip6addr, &if_sa6->sin6_addr, 597 sizeof(struct in6_addr)); 598 599 /* Put it on the wire */ 600 sb = sendto(ip6socket, v, IPV6_HELLO_MSG_SIZE, 601 0, (struct sockaddr *)&sadest6, sizeof(sadest6)); 602 if (sb < (ssize_t)(IPV6_HELLO_MSG_SIZE)) 603 fatalp("send6: %s", strerror(errno)); 604 else 605 debugp("Sent (IPv6) %zd bytes on %s " 606 "(PDU: %d, Hello TLV: %d, CH: %d TR: %d)\n", 607 sb, ifb->ifa_name, htons(spdu->length), 608 htons(t->length), htons(cht->length), 609 htons(trtlv->length)); 610 } 611 #endif 612 freeifaddrs(ifa); 613 free(v); 614 } 615 616 int 617 get_message_id(void) 618 { 619 current_msg_id++; 620 return current_msg_id; 621 } 622 623 static int 624 get_local_addr(struct sockaddr_dl *sdl, struct in_addr *sin) 625 { 626 struct ifaddrs *ifa, *ifb; 627 struct sockaddr_in *sinet; 628 629 if (sdl == NULL) 630 return -1; 631 632 if (getifaddrs(&ifa) == -1) 633 return -1; 634 for (ifb = ifa; ifb; ifb = ifb->ifa_next) 635 if (ifb->ifa_addr->sa_family == AF_INET) { 636 if (if_nametoindex(ifb->ifa_name) != sdl->sdl_index) 637 continue; 638 sinet = (struct sockaddr_in*) ifb->ifa_addr; 639 sin->s_addr = sinet->sin_addr.s_addr; 640 freeifaddrs(ifa); 641 return 0; 642 } 643 freeifaddrs(ifa); 644 return -1; 645 } 646 647 /* Receive PDUs on Multicast UDP socket */ 648 void 649 recv_pdu(int sock) 650 { 651 struct ldp_pdu rpdu; 652 int c, i; 653 struct msghdr msg; 654 struct iovec iov[1]; 655 unsigned char recvspace[MAX_PDU_SIZE]; 656 struct hello_tlv *t; 657 union sockunion sender; 658 struct sockaddr_dl *sdl = NULL; 659 struct in_addr my_ldp_addr, local_addr; 660 struct cmsghdr *cmptr; 661 union { 662 struct cmsghdr cm; 663 char control[1024]; 664 } control_un; 665 666 memset(&msg, 0, sizeof(msg)); 667 msg.msg_control = control_un.control; 668 msg.msg_controllen = sizeof(control_un.control); 669 msg.msg_flags = 0; 670 msg.msg_name = &sender; 671 msg.msg_namelen = sizeof(sender); 672 iov[0].iov_base = recvspace; 673 iov[0].iov_len = sizeof(recvspace); 674 msg.msg_iov = iov; 675 msg.msg_iovlen = 1; 676 677 c = recvmsg(sock, &msg, MSG_WAITALL); 678 679 /* Check to see if this is larger than MIN_PDU_SIZE */ 680 if (c < MIN_PDU_SIZE) 681 return; 682 683 /* Read the PDU */ 684 i = get_pdu(recvspace, &rpdu); 685 686 debugp("recv_pdu(%d): PDU(size: %d) from: %s\n", sock, 687 c, satos(&sender.sa)); 688 689 /* We currently understand Version 1 */ 690 if (rpdu.version != LDP_VERSION) { 691 warnp("recv_pdu: Version mismatch\n"); 692 return; 693 } 694 695 /* Check if it's our hello */ 696 inet_aton(LDP_ID, &my_ldp_addr); 697 if (rpdu.ldp_id.s_addr == my_ldp_addr.s_addr) { 698 /* It should not be looped. We set MULTICAST_LOOP 0 */ 699 fatalp("Received our PDU. Ignoring it\n"); 700 return; 701 } 702 703 if (msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr) || 704 (msg.msg_flags & MSG_CTRUNC)) 705 local_addr.s_addr = my_ldp_addr.s_addr; 706 else { 707 for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL; 708 cmptr = CMSG_NXTHDR(&msg, cmptr)) 709 if (cmptr->cmsg_level == IPPROTO_IP && 710 cmptr->cmsg_type == IP_RECVIF) { 711 sdl = (struct sockaddr_dl *) CMSG_DATA(cmptr); 712 break; 713 } 714 if (get_local_addr(sdl, &local_addr) != 0) 715 local_addr.s_addr = my_ldp_addr.s_addr; 716 } 717 718 719 debugp("Read %d bytes from address %s Length: %.4d Version: %d\n", 720 c, inet_ntoa(rpdu.ldp_id), rpdu.length, rpdu.version); 721 722 /* Fill the TLV messages */ 723 t = get_hello_tlv(recvspace + i, c - i); 724 run_ldp_hello(&rpdu, t, &sender.sa, &local_addr, sock, may_connect); 725 } 726 727 void 728 send_hello_alarm(int unused) 729 { 730 struct ldp_peer *p, *ptmp; 731 struct hello_info *hi, *hinext; 732 time_t t = time(NULL); 733 int olderrno = errno; 734 735 if (may_connect == false) 736 may_connect = true; 737 /* Send hellos */ 738 if (!(t % ldp_hello_time)) 739 send_hello(); 740 741 /* Timeout -- */ 742 SLIST_FOREACH(p, &ldp_peer_head, peers) 743 p->timeout--; 744 745 /* Check for timeout */ 746 SLIST_FOREACH_SAFE(p, &ldp_peer_head, peers, ptmp) 747 if (p->timeout < 1) 748 switch (p->state) { 749 case LDP_PEER_HOLDDOWN: 750 debugp("LDP holddown expired for peer %s\n", 751 inet_ntoa(p->ldp_id)); 752 ldp_peer_delete(p); 753 break; 754 case LDP_PEER_ESTABLISHED: 755 case LDP_PEER_CONNECTED: 756 send_notification(p, 0, 757 NOTIF_FATAL|NOTIF_KEEP_ALIVE_TIMER_EXPIRED); 758 warnp("Keepalive expired for %s\n", 759 inet_ntoa(p->ldp_id)); 760 ldp_peer_holddown(p); 761 break; 762 } /* switch */ 763 764 /* send keepalives */ 765 if (!(t % ldp_keepalive_time)) { 766 SLIST_FOREACH(p, &ldp_peer_head, peers) 767 if (p->state == LDP_PEER_ESTABLISHED) { 768 debugp("Sending KeepAlive to %s\n", 769 inet_ntoa(p->ldp_id)); 770 keep_alive(p); 771 } 772 } 773 774 /* Decrement and Check hello keepalives */ 775 SLIST_FOREACH_SAFE(hi, &hello_info_head, infos, hinext) { 776 if (hi->keepalive != 0xFFFF) 777 hi->keepalive--; 778 if (hi->keepalive < 1) 779 SLIST_REMOVE(&hello_info_head, hi, hello_info, infos); 780 } 781 782 /* Set the alarm again and bail out */ 783 alarm(1); 784 errno = olderrno; 785 } 786 787 static void 788 bail_out(int x) 789 { 790 ldp_peer_holddown_all(); 791 flush_mpls_routes(); 792 exit(0); 793 } 794 795 static void 796 print_info(int x) 797 { 798 printf("Info for %s\n-------\n", LDP_ID); 799 printf("Neighbours:\n"); 800 show_neighbours(1, NULL); 801 printf("Bindings:\n"); 802 show_bindings(1, NULL); 803 printf("Labels:\n"); 804 show_labels(1, NULL); 805 printf("--------\n"); 806 } 807 808 /* 809 * The big poll that catches every single event 810 * on every socket. 811 */ 812 int 813 the_big_loop(void) 814 { 815 int sock_error; 816 uint32_t i; 817 socklen_t sock_error_size = sizeof(int); 818 struct ldp_peer *p; 819 struct com_sock *cs; 820 struct pollfd pfd[MAX_POLL_FDS]; 821 struct hello_socket *hs; 822 nfds_t pollsum; 823 #ifdef RO_MSGFILTER 824 unsigned char msgfilter[] = { 825 RTM_NEWADDR, RTM_DELADDR, 826 RTM_ADD, RTM_DELETE, RTM_CHANGE, 827 }; 828 #endif 829 830 assert(MAX_POLL_FDS > 5); 831 832 SLIST_INIT(&hello_info_head); 833 834 signal(SIGALRM, send_hello_alarm); 835 signal(SIGPIPE, SIG_IGN); 836 signal(SIGINT, bail_out); 837 signal(SIGTERM, bail_out); 838 signal(SIGINFO, print_info); 839 840 /* Send first hellos in 5 seconds. Avoid No hello notifications */ 841 may_connect = false; 842 alarm(5); 843 844 route_socket = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC); 845 setsockopt(route_socket, SOL_SOCKET, SO_USELOOPBACK, &(int){0}, 846 sizeof(int)); 847 #ifdef RO_MSGFILTER 848 setsockopt(route_socket, PF_ROUTE, RO_MSGFILTER, &msgfilter, 849 sizeof(msgfilter)); 850 #endif 851 852 sock_error = bind_current_routes(); 853 if (sock_error != LDP_E_OK) { 854 fatalp("Cannot get current routes\n"); 855 return sock_error; 856 } 857 858 for (;;) { 859 pfd[0].fd = ls; 860 pfd[0].events = POLLRDNORM; 861 pfd[0].revents = 0; 862 863 pfd[1].fd = route_socket; 864 pfd[1].events = POLLRDNORM; 865 pfd[1].revents = 0; 866 867 pfd[2].fd = command_socket; 868 pfd[2].events = POLLRDNORM; 869 pfd[2].revents = 0; 870 871 /* Hello sockets */ 872 pollsum = 3; 873 SLIST_FOREACH(hs, &hello_socket_head, listentry) { 874 pfd[pollsum].fd = hs->socket; 875 pfd[pollsum].events = POLLIN; 876 pfd[pollsum].revents = 0; 877 pollsum++; 878 } 879 880 /* Command sockets */ 881 for (i=0; i < MAX_COMMAND_SOCKETS; i++) 882 if (csockets[i].socket != -1) { 883 if (pollsum >= MAX_POLL_FDS) 884 break; 885 pfd[pollsum].fd = csockets[i].socket; 886 pfd[pollsum].events = POLLIN; 887 pfd[pollsum].revents = 0; 888 pollsum++; 889 } 890 891 /* LDP Peer sockets */ 892 SLIST_FOREACH(p, &ldp_peer_head, peers) { 893 if (p->socket < 1) 894 continue; 895 switch (p->state) { 896 case LDP_PEER_CONNECTED: 897 case LDP_PEER_ESTABLISHED: 898 if (pollsum >= MAX_POLL_FDS) 899 break; 900 pfd[pollsum].fd = p->socket; 901 pfd[pollsum].events = POLLRDNORM; 902 pfd[pollsum].revents = 0; 903 pollsum++; 904 break; 905 case LDP_PEER_CONNECTING: 906 if (pollsum >= MAX_POLL_FDS) 907 break; 908 pfd[pollsum].fd = p->socket; 909 pfd[pollsum].events = POLLWRNORM; 910 pfd[pollsum].revents = 0; 911 pollsum++; 912 break; 913 } 914 } 915 916 if (pollsum >= MAX_POLL_FDS) { 917 fatalp("Too many sockets. Increase MAX_POLL_FDS\n"); 918 return LDP_E_TOO_MANY_FDS; 919 } 920 if (poll(pfd, pollsum, INFTIM) < 0) { 921 if (errno != EINTR) 922 fatalp("poll: %s", strerror(errno)); 923 continue; 924 } 925 926 for (i = 0; i < pollsum; i++) { 927 if ((pfd[i].revents & POLLRDNORM) || 928 (pfd[i].revents & POLLIN)) { 929 if(pfd[i].fd == ls) 930 new_peer_connection(); 931 else if (pfd[i].fd == route_socket) { 932 struct rt_msg xbuf; 933 int l, rtmlen = sizeof(xbuf); 934 /* Read at least rtm_msglen */ 935 l = recv(route_socket, &xbuf, 936 sizeof(u_short), MSG_PEEK); 937 if (l == sizeof(u_short)) 938 rtmlen = xbuf.m_rtm.rtm_msglen; 939 do { 940 l = recv(route_socket, &xbuf, 941 rtmlen, MSG_WAITALL); 942 } while ((l == -1) && (errno == EINTR)); 943 944 if (l == -1) 945 break; 946 947 check_route(&xbuf, l); 948 949 } else if (is_hello_socket(pfd[i].fd) == 1) { 950 /* Receiving hello socket */ 951 recv_pdu(pfd[i].fd); 952 } else if (pfd[i].fd == command_socket) { 953 command_accept(command_socket); 954 } else if ((cs = is_command_socket(pfd[i].fd)) 955 != NULL) { 956 command_dispatch(cs); 957 } else { 958 /* ldp peer socket */ 959 p = get_ldp_peer_by_socket(pfd[i].fd); 960 if (p) 961 recv_session_pdu(p); 962 } 963 } else if(pfd[i].revents & POLLWRNORM) { 964 p = get_ldp_peer_by_socket(pfd[i].fd); 965 if (!p) 966 continue; 967 assert(p->state == LDP_PEER_CONNECTING); 968 if (getsockopt(pfd[i].fd, SOL_SOCKET, SO_ERROR, 969 &sock_error, &sock_error_size) != 0 || 970 sock_error != 0) { 971 ldp_peer_holddown(p); 972 sock_error = 0; 973 } else { 974 p->state = LDP_PEER_CONNECTED; 975 send_initialize(p); 976 } 977 } 978 } 979 980 for (int ri = 0; ri < replay_index; ri++) { 981 debugp("Replaying: PID %d, SEQ %d\n", 982 replay_rt[ri].m_rtm.rtm_pid, 983 replay_rt[ri].m_rtm.rtm_seq); 984 check_route(&replay_rt[ri], sizeof(struct rt_msg)); 985 } 986 replay_index = 0; 987 } /* for (;;) */ 988 } 989 990 void 991 new_peer_connection() 992 { 993 union sockunion peer_address, my_address; 994 struct in_addr *peer_ldp_id = NULL; 995 struct hello_info *hi; 996 int s; 997 998 s = accept(ls, &peer_address.sa, 999 & (socklen_t) { sizeof(union sockunion) } ); 1000 if (s < 0) { 1001 fatalp("accept: %s", strerror(errno)); 1002 return; 1003 } 1004 1005 if (getsockname(s, &my_address.sa, 1006 & (socklen_t) { sizeof(union sockunion) } )) { 1007 fatalp("new_peer_connection(): cannot getsockname\n"); 1008 close(s); 1009 return; 1010 } 1011 1012 if (peer_address.sa.sa_family == AF_INET) 1013 peer_address.sin.sin_port = 0; 1014 else if (peer_address.sa.sa_family == AF_INET6) 1015 peer_address.sin6.sin6_port = 0; 1016 else { 1017 fatalp("Unknown peer address family\n"); 1018 close(s); 1019 return; 1020 } 1021 1022 /* Already peered or in holddown ? */ 1023 if (get_ldp_peer(&peer_address.sa) != NULL) { 1024 close(s); 1025 return; 1026 } 1027 1028 warnp("Accepted a connection from %s\n", satos(&peer_address.sa)); 1029 1030 /* Verify if it should connect - XXX: no check for INET6 */ 1031 if (peer_address.sa.sa_family == AF_INET && 1032 ntohl(peer_address.sin.sin_addr.s_addr) < 1033 ntohl(my_address.sin.sin_addr.s_addr)) { 1034 fatalp("Peer %s: connect from lower ID\n", 1035 satos(&peer_address.sa)); 1036 close(s); 1037 return; 1038 } 1039 1040 /* Match hello info in order to get ldp_id */ 1041 SLIST_FOREACH(hi, &hello_info_head, infos) { 1042 if (sockaddr_cmp(&peer_address.sa, 1043 &hi->transport_address.sa) == 0) { 1044 peer_ldp_id = &hi->ldp_id; 1045 break; 1046 } 1047 } 1048 if (peer_ldp_id == NULL) { 1049 warnp("Got connection from %s, but no hello info exists\n", 1050 satos(&peer_address.sa)); 1051 close(s); 1052 return; 1053 } else 1054 ldp_peer_new(peer_ldp_id, &peer_address.sa, NULL, 1055 ldp_holddown_time, s); 1056 1057 } 1058 1059 void 1060 send_initialize(const struct ldp_peer * p) 1061 { 1062 struct init_tlv ti; 1063 1064 ti.type = htons(LDP_INITIALIZE); 1065 ti.length = htons(sizeof(struct init_tlv) - TLV_TYPE_LENGTH); 1066 ti.messageid = htonl(get_message_id()); 1067 ti.cs_type = htons(TLV_COMMON_SESSION); 1068 ti.cs_len = htons(CS_LEN); 1069 ti.cs_version = htons(LDP_VERSION); 1070 ti.cs_keepalive = htons(2 * ldp_keepalive_time); 1071 ti.cs_adpvlim = 0; 1072 ti.cs_maxpdulen = htons(MAX_PDU_SIZE); 1073 ti.cs_peeraddress.s_addr = p->ldp_id.s_addr; 1074 ti.cs_peeraddrspace = 0; 1075 1076 send_tlv(p, (struct tlv *) (void *) &ti); 1077 } 1078 1079 void 1080 keep_alive(const struct ldp_peer * p) 1081 { 1082 struct ka_tlv kt; 1083 1084 kt.type = htons(LDP_KEEPALIVE); 1085 kt.length = htons(sizeof(kt.messageid)); 1086 kt.messageid = htonl(get_message_id()); 1087 1088 send_tlv(p, (struct tlv *) (void *) &kt); 1089 } 1090 1091 /* 1092 * Process a message received from a peer 1093 */ 1094 void 1095 recv_session_pdu(struct ldp_peer * p) 1096 { 1097 struct ldp_pdu *rpdu; 1098 struct address_tlv *atlv; 1099 struct al_tlv *altlv; 1100 struct init_tlv *itlv; 1101 struct label_map_tlv *lmtlv; 1102 struct fec_tlv *fectlv; 1103 struct label_tlv *labeltlv; 1104 struct notification_tlv *nottlv; 1105 struct hello_info *hi; 1106 1107 int c; 1108 int32_t wo = 0; 1109 struct tlv *ttmp; 1110 unsigned char recvspace[MAX_PDU_SIZE]; 1111 1112 memset(recvspace, 0, MAX_PDU_SIZE); 1113 1114 do { 1115 c = recv(p->socket, (void *) recvspace, MAX_PDU_SIZE, MSG_PEEK); 1116 } while (c == -1 && errno == EINTR); 1117 1118 debugp("Ready to read %d bytes\n", c); 1119 1120 if (c < 1) { /* Session closed */ 1121 warnp("Error in connection with %s\n", inet_ntoa(p->ldp_id)); 1122 ldp_peer_holddown(p); 1123 return; 1124 } 1125 if (c > MAX_PDU_SIZE) { 1126 debugp("Incoming PDU size exceeds MAX_PDU_SIZE !\n"); 1127 return; 1128 } 1129 if (c < MIN_PDU_SIZE) { 1130 debugp("PDU too small received from peer %s\n", 1131 inet_ntoa(p->ldp_id)); 1132 return; 1133 } 1134 rpdu = (struct ldp_pdu *) recvspace; 1135 do { 1136 c = recv(p->socket, (void *) recvspace, 1137 ntohs(rpdu->length) + PDU_VER_LENGTH, MSG_WAITALL); 1138 } while (c == -1 && errno == EINTR); 1139 1140 /* sanity check */ 1141 if (check_recv_pdu(p, rpdu, c) != 0) 1142 return; 1143 1144 debugp("Read %d bytes, PDU size: %d bytes\n", c, ntohs(rpdu->length)); 1145 wo = sizeof(struct ldp_pdu); 1146 1147 while (wo + TLV_TYPE_LENGTH < (uint)c) { 1148 1149 ttmp = (struct tlv *) (&recvspace[wo]); 1150 1151 if ((ntohs(ttmp->type) != LDP_KEEPALIVE) && 1152 (ntohs(ttmp->type) != LDP_LABEL_MAPPING)) { 1153 debugp("Got Type: 0x%.4X (Length: %d) from %s\n", 1154 ntohs(ttmp->type), ntohs(ttmp->length), 1155 inet_ntoa(p->ldp_id)); 1156 } else 1157 debugp("Got Type: 0x%.4X (Length: %d) from %s\n", 1158 ntohs(ttmp->type), ntohs(ttmp->length), 1159 inet_ntoa(p->ldp_id)); 1160 1161 /* Should we get the message ? */ 1162 if (p->state != LDP_PEER_ESTABLISHED && 1163 ntohs(ttmp->type) != LDP_INITIALIZE && 1164 ntohs(ttmp->type) != LDP_KEEPALIVE && 1165 ntohs(ttmp->type) != LDP_NOTIFICATION) 1166 break; 1167 /* The big switch */ 1168 switch (ntohs(ttmp->type)) { 1169 case LDP_INITIALIZE: 1170 itlv = (struct init_tlv *)ttmp; 1171 /* Check size */ 1172 if (ntohs(itlv->length) < 1173 sizeof(struct init_tlv) - TLV_TYPE_LENGTH) { 1174 debugp("Bad size\n"); 1175 send_notification(p, 0, 1176 NOTIF_BAD_PDU_LEN | NOTIF_FATAL); 1177 ldp_peer_holddown(p); 1178 break; 1179 } 1180 /* Check version */ 1181 if (ntohs(itlv->cs_version) != LDP_VERSION) { 1182 debugp("Bad version"); 1183 send_notification(p, ntohl(itlv->messageid), 1184 NOTIF_BAD_LDP_VER | NOTIF_FATAL); 1185 ldp_peer_holddown(p); 1186 break; 1187 } 1188 /* Check if we got any hello from this one */ 1189 SLIST_FOREACH(hi, &hello_info_head, infos) 1190 if (hi->ldp_id.s_addr == rpdu->ldp_id.s_addr) 1191 break; 1192 if (hi == NULL) { 1193 debugp("No hello. Moving peer to holddown\n"); 1194 send_notification(p, ntohl(itlv->messageid), 1195 NOTIF_SESSION_REJECTED_NO_HELLO | NOTIF_FATAL); 1196 ldp_peer_holddown(p); 1197 break; 1198 } 1199 1200 if (!p->master) { 1201 send_initialize(p); 1202 keep_alive(p); 1203 } else { 1204 p->state = LDP_PEER_ESTABLISHED; 1205 p->established_t = time(NULL); 1206 keep_alive(p); 1207 1208 /* 1209 * Recheck here ldp id because we accepted 1210 * connection without knowing who is it for sure 1211 */ 1212 p->ldp_id.s_addr = rpdu->ldp_id.s_addr; 1213 1214 fatalp("LDP neighbour %s is UP\n", 1215 inet_ntoa(p->ldp_id)); 1216 mpls_add_ldp_peer(p); 1217 send_addresses(p); 1218 send_all_bindings(p); 1219 } 1220 break; 1221 case LDP_KEEPALIVE: 1222 if ((p->state == LDP_PEER_CONNECTED) && (!p->master)) { 1223 p->state = LDP_PEER_ESTABLISHED; 1224 p->established_t = time(NULL); 1225 fatalp("LDP neighbour %s is UP\n", 1226 inet_ntoa(p->ldp_id)); 1227 mpls_add_ldp_peer(p); 1228 send_addresses(p); 1229 send_all_bindings(p); 1230 } 1231 p->timeout = p->holdtime; 1232 break; 1233 case LDP_ADDRESS: 1234 /* Add peer addresses */ 1235 atlv = (struct address_tlv *) ttmp; 1236 altlv = (struct al_tlv *) (&atlv[1]); 1237 add_ifaddresses(p, altlv); 1238 /* 1239 * try to see if we have labels with null peer that 1240 * would match the new peer 1241 */ 1242 label_check_assoc(p); 1243 print_bounded_addresses(p); 1244 break; 1245 case LDP_ADDRESS_WITHDRAW: 1246 atlv = (struct address_tlv *) ttmp; 1247 altlv = (struct al_tlv *) (&atlv[1]); 1248 del_ifaddresses(p, altlv); 1249 break; 1250 case LDP_LABEL_MAPPING: 1251 lmtlv = (struct label_map_tlv *) ttmp; 1252 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1253 labeltlv = (struct label_tlv *)((unsigned char *)fectlv 1254 + ntohs(fectlv->length) + TLV_TYPE_LENGTH); 1255 map_label(p, fectlv, labeltlv); 1256 break; 1257 case LDP_LABEL_REQUEST: 1258 lmtlv = (struct label_map_tlv *) ttmp; 1259 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1260 switch (request_respond(p, lmtlv, fectlv)) { 1261 case LDP_E_BAD_FEC: 1262 send_notification(p, ntohl(lmtlv->messageid), 1263 NOTIF_UNKNOWN_TLV); 1264 break; 1265 case LDP_E_BAD_AF: 1266 send_notification(p, ntohl(lmtlv->messageid), 1267 NOTIF_UNSUPPORTED_AF); 1268 break; 1269 case LDP_E_NO_SUCH_ROUTE: 1270 send_notification(p, ntohl(lmtlv->messageid), 1271 NOTIF_NO_ROUTE); 1272 break; 1273 } 1274 break; 1275 case LDP_LABEL_WITHDRAW: 1276 lmtlv = (struct label_map_tlv *) ttmp; 1277 fectlv = (struct fec_tlv *) (&lmtlv[1]); 1278 if (withdraw_label(p, fectlv) == LDP_E_OK) { 1279 /* Send RELEASE */ 1280 prepare_release(ttmp); 1281 send_tlv(p, ttmp); 1282 } 1283 break; 1284 case LDP_LABEL_RELEASE: 1285 /* 1286 * XXX: we need to make a timed queue... 1287 * For now I just assume peers are processing messages 1288 * correctly so I just ignore confirmations 1289 */ 1290 wo = -1; /* Ignore rest of message */ 1291 break; 1292 case LDP_LABEL_ABORT: 1293 /* XXX: For now I pretend I can process everything 1294 * RFC 5036, Section 3.5.9.1 1295 * If an LSR receives a Label Abort Request Message after it 1296 * has responded to the Label Request in question with a Label 1297 * Mapping message or a Notification message, it ignores the 1298 * abort request. 1299 */ 1300 wo = -1; 1301 break; 1302 case LDP_NOTIFICATION: 1303 nottlv = (struct notification_tlv *) ttmp; 1304 nottlv->st_code = ntohl(nottlv->st_code); 1305 fatalp("Got notification 0x%X from peer %s\n", 1306 nottlv->st_code, inet_ntoa(p->ldp_id)); 1307 if (nottlv->st_code >> 31) { 1308 fatalp("LDP peer %s signalized %s\n", 1309 inet_ntoa(p->ldp_id), 1310 NOTIF_STR[(nottlv->st_code << 1) >> 1]); 1311 ldp_peer_holddown(p); 1312 wo = -1; 1313 } 1314 break; 1315 case LDP_HELLO: 1316 /* No hellos should came on tcp session */ 1317 wo = -1; 1318 break; 1319 default: 1320 warnp("Unknown TLV received from %s\n", 1321 inet_ntoa(p->ldp_id)); 1322 debug_tlv(ttmp); 1323 wo = -1;/* discard the rest of the message */ 1324 break; 1325 } 1326 if (wo < 0) { 1327 debugp("Discarding the rest of the message\n"); 1328 break; 1329 } else { 1330 wo += ntohs(ttmp->length) + TLV_TYPE_LENGTH; 1331 debugp("WORKED ON %u bytes (Left %d)\n", wo, c - wo); 1332 } 1333 } /* while */ 1334 1335 } 1336 1337 /* Sends a pdu, tlv pair to a connected peer */ 1338 int 1339 send_message(const struct ldp_peer * p, const struct ldp_pdu * pdu, 1340 const struct tlv * t) 1341 { 1342 unsigned char sendspace[MAX_PDU_SIZE]; 1343 1344 /* Check if peer is connected */ 1345 switch (p->state) { 1346 case LDP_PEER_CONNECTED: 1347 case LDP_PEER_ESTABLISHED: 1348 break; 1349 default: 1350 return -1; 1351 } 1352 1353 /* Check length validity first */ 1354 if (ntohs(pdu->length) != 1355 ntohs(t->length) + TLV_TYPE_LENGTH + PDU_PAYLOAD_LENGTH) { 1356 fatalp("LDP: TLV - PDU incompability. Message discarded\n"); 1357 fatalp("LDP: TLV len %d - PDU len %d\n", ntohs(t->length), 1358 ntohs(pdu->length)); 1359 return -1; 1360 } 1361 if (ntohs(t->length) + PDU_VER_LENGTH > MAX_PDU_SIZE) { 1362 fatalp("Message to large discarded\n"); 1363 return -1; 1364 } 1365 /* Arrange them in a buffer and send */ 1366 memcpy(sendspace, pdu, sizeof(struct ldp_pdu)); 1367 memcpy(sendspace + sizeof(struct ldp_pdu), t, 1368 ntohs(t->length) + TLV_TYPE_LENGTH); 1369 1370 /* Report keepalives only for DEBUG */ 1371 if ((ntohs(t->type) != 0x201) && (ntohs(t->type) != 0x400)) { 1372 debugp("Sending message type 0x%.4X to %s (size: %d)\n", 1373 ntohs(t->type), inet_ntoa(p->ldp_id), ntohs(t->length)); 1374 } else 1375 /* downgraded from warnp to debugp for now */ 1376 debugp("Sending message type 0x%.4X to %s (size: %d)\n", 1377 ntohs(t->type), inet_ntoa(p->ldp_id), ntohs(t->length)); 1378 1379 /* Send it finally */ 1380 return send(p->socket, sendspace, 1381 ntohs(pdu->length) + PDU_VER_LENGTH, 0); 1382 } 1383 1384 /* 1385 * Encapsulates TLV into a PDU and sends it to a peer 1386 */ 1387 int 1388 send_tlv(const struct ldp_peer * p, const struct tlv * t) 1389 { 1390 struct ldp_pdu pdu; 1391 1392 pdu.version = htons(LDP_VERSION); 1393 inet_aton(LDP_ID, &pdu.ldp_id); 1394 pdu.label_space = 0; 1395 pdu.length = htons(ntohs(t->length) + TLV_TYPE_LENGTH + 1396 PDU_PAYLOAD_LENGTH); 1397 1398 return send_message(p, &pdu, t); 1399 } 1400 1401 1402 int 1403 send_addresses(const struct ldp_peer * p) 1404 { 1405 struct address_list_tlv *t; 1406 int ret; 1407 1408 t = build_address_list_tlv(); 1409 1410 ret = send_tlv(p, (struct tlv *) t); 1411 free(t); 1412 return ret; 1413 1414 } 1415