1 /* 2 * Copyright (C) 1999 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * Extensively modified by Hannes Gredler (hannes (at) juniper.net) for more 30 * complete BGP support. 31 */ 32 33 #ifdef HAVE_CONFIG_H 34 #include "config.h" 35 #endif 36 37 #ifndef lint 38 static const char rcsid[] _U_ = 39 "@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.118 2007-12-07 15:54:52 hannes Exp $"; 40 #endif 41 42 #include <tcpdump-stdinc.h> 43 44 #include <stdio.h> 45 #include <string.h> 46 47 #include "interface.h" 48 #include "decode_prefix.h" 49 #include "addrtoname.h" 50 #include "extract.h" 51 #include "bgp.h" 52 #include "af.h" 53 #include "l2vpn.h" 54 55 struct bgp { 56 u_int8_t bgp_marker[16]; 57 u_int16_t bgp_len; 58 u_int8_t bgp_type; 59 }; 60 #define BGP_SIZE 19 /* unaligned */ 61 62 #define BGP_OPEN 1 63 #define BGP_UPDATE 2 64 #define BGP_NOTIFICATION 3 65 #define BGP_KEEPALIVE 4 66 #define BGP_ROUTE_REFRESH 5 67 68 static const struct tok bgp_msg_values[] = { 69 { BGP_OPEN, "Open"}, 70 { BGP_UPDATE, "Update"}, 71 { BGP_NOTIFICATION, "Notification"}, 72 { BGP_KEEPALIVE, "Keepalive"}, 73 { BGP_ROUTE_REFRESH, "Route Refresh"}, 74 { 0, NULL} 75 }; 76 77 struct bgp_open { 78 u_int8_t bgpo_marker[16]; 79 u_int16_t bgpo_len; 80 u_int8_t bgpo_type; 81 u_int8_t bgpo_version; 82 u_int16_t bgpo_myas; 83 u_int16_t bgpo_holdtime; 84 u_int32_t bgpo_id; 85 u_int8_t bgpo_optlen; 86 /* options should follow */ 87 }; 88 #define BGP_OPEN_SIZE 29 /* unaligned */ 89 90 struct bgp_opt { 91 u_int8_t bgpopt_type; 92 u_int8_t bgpopt_len; 93 /* variable length */ 94 }; 95 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */ 96 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */ 97 98 struct bgp_notification { 99 u_int8_t bgpn_marker[16]; 100 u_int16_t bgpn_len; 101 u_int8_t bgpn_type; 102 u_int8_t bgpn_major; 103 u_int8_t bgpn_minor; 104 }; 105 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */ 106 107 struct bgp_route_refresh { 108 u_int8_t bgp_marker[16]; 109 u_int16_t len; 110 u_int8_t type; 111 u_int8_t afi[2]; /* the compiler messes this structure up */ 112 u_int8_t res; /* when doing misaligned sequences of int8 and int16 */ 113 u_int8_t safi; /* afi should be int16 - so we have to access it using */ 114 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */ 115 #define BGP_ROUTE_REFRESH_SIZE 23 116 117 #define bgp_attr_lenlen(flags, p) \ 118 (((flags) & 0x10) ? 2 : 1) 119 #define bgp_attr_len(flags, p) \ 120 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p)) 121 122 #define BGPTYPE_ORIGIN 1 123 #define BGPTYPE_AS_PATH 2 124 #define BGPTYPE_NEXT_HOP 3 125 #define BGPTYPE_MULTI_EXIT_DISC 4 126 #define BGPTYPE_LOCAL_PREF 5 127 #define BGPTYPE_ATOMIC_AGGREGATE 6 128 #define BGPTYPE_AGGREGATOR 7 129 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */ 130 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */ 131 #define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */ 132 #define BGPTYPE_DPA 11 /* draft-ietf-idr-bgp-dpa */ 133 #define BGPTYPE_ADVERTISERS 12 /* RFC1863 */ 134 #define BGPTYPE_RCID_PATH 13 /* RFC1863 */ 135 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */ 136 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */ 137 #define BGPTYPE_EXTD_COMMUNITIES 16 /* draft-ietf-idr-bgp-ext-communities */ 138 #define BGPTYPE_AS4_PATH 17 /* RFC4893 */ 139 #define BGPTYPE_AGGREGATOR4 18 /* RFC4893 */ 140 #define BGPTYPE_PMSI_TUNNEL 22 /* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */ 141 #define BGPTYPE_ATTR_SET 128 /* draft-marques-ppvpn-ibgp */ 142 143 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */ 144 145 static const struct tok bgp_attr_values[] = { 146 { BGPTYPE_ORIGIN, "Origin"}, 147 { BGPTYPE_AS_PATH, "AS Path"}, 148 { BGPTYPE_AS4_PATH, "AS4 Path"}, 149 { BGPTYPE_NEXT_HOP, "Next Hop"}, 150 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"}, 151 { BGPTYPE_LOCAL_PREF, "Local Preference"}, 152 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"}, 153 { BGPTYPE_AGGREGATOR, "Aggregator"}, 154 { BGPTYPE_AGGREGATOR4, "Aggregator4"}, 155 { BGPTYPE_COMMUNITIES, "Community"}, 156 { BGPTYPE_ORIGINATOR_ID, "Originator ID"}, 157 { BGPTYPE_CLUSTER_LIST, "Cluster List"}, 158 { BGPTYPE_DPA, "DPA"}, 159 { BGPTYPE_ADVERTISERS, "Advertisers"}, 160 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"}, 161 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"}, 162 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"}, 163 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"}, 164 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"}, 165 { BGPTYPE_ATTR_SET, "Attribute Set"}, 166 { 255, "Reserved for development"}, 167 { 0, NULL} 168 }; 169 170 #define BGP_AS_SET 1 171 #define BGP_AS_SEQUENCE 2 172 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */ 173 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */ 174 175 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET 176 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET 177 178 static const struct tok bgp_as_path_segment_open_values[] = { 179 { BGP_AS_SEQUENCE, ""}, 180 { BGP_AS_SET, "{ "}, 181 { BGP_CONFED_AS_SEQUENCE, "( "}, 182 { BGP_CONFED_AS_SET, "({ "}, 183 { 0, NULL} 184 }; 185 186 static const struct tok bgp_as_path_segment_close_values[] = { 187 { BGP_AS_SEQUENCE, ""}, 188 { BGP_AS_SET, "}"}, 189 { BGP_CONFED_AS_SEQUENCE, ")"}, 190 { BGP_CONFED_AS_SET, "})"}, 191 { 0, NULL} 192 }; 193 194 #define BGP_OPT_AUTH 1 195 #define BGP_OPT_CAP 2 196 197 198 static const struct tok bgp_opt_values[] = { 199 { BGP_OPT_AUTH, "Authentication Information"}, 200 { BGP_OPT_CAP, "Capabilities Advertisement"}, 201 { 0, NULL} 202 }; 203 204 #define BGP_CAPCODE_MP 1 205 #define BGP_CAPCODE_RR 2 206 #define BGP_CAPCODE_ORF 3 /* XXX */ 207 #define BGP_CAPCODE_RESTART 64 /* draft-ietf-idr-restart-05 */ 208 #define BGP_CAPCODE_AS_NEW 65 /* XXX */ 209 #define BGP_CAPCODE_DYN_CAP 67 /* XXX */ 210 #define BGP_CAPCODE_RR_CISCO 128 211 212 static const struct tok bgp_capcode_values[] = { 213 { BGP_CAPCODE_MP, "Multiprotocol Extensions"}, 214 { BGP_CAPCODE_RR, "Route Refresh"}, 215 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"}, 216 { BGP_CAPCODE_RESTART, "Graceful Restart"}, 217 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"}, 218 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"}, 219 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"}, 220 { 0, NULL} 221 }; 222 223 #define BGP_NOTIFY_MAJOR_MSG 1 224 #define BGP_NOTIFY_MAJOR_OPEN 2 225 #define BGP_NOTIFY_MAJOR_UPDATE 3 226 #define BGP_NOTIFY_MAJOR_HOLDTIME 4 227 #define BGP_NOTIFY_MAJOR_FSM 5 228 #define BGP_NOTIFY_MAJOR_CEASE 6 229 #define BGP_NOTIFY_MAJOR_CAP 7 230 231 static const struct tok bgp_notify_major_values[] = { 232 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"}, 233 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"}, 234 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"}, 235 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"}, 236 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"}, 237 { BGP_NOTIFY_MAJOR_CEASE, "Cease"}, 238 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"}, 239 { 0, NULL} 240 }; 241 242 /* draft-ietf-idr-cease-subcode-02 */ 243 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1 244 static const struct tok bgp_notify_minor_cease_values[] = { 245 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"}, 246 { 2, "Administratively Shutdown"}, 247 { 3, "Peer Unconfigured"}, 248 { 4, "Administratively Reset"}, 249 { 5, "Connection Rejected"}, 250 { 6, "Other Configuration Change"}, 251 { 7, "Connection Collision Resolution"}, 252 { 0, NULL} 253 }; 254 255 static const struct tok bgp_notify_minor_msg_values[] = { 256 { 1, "Connection Not Synchronized"}, 257 { 2, "Bad Message Length"}, 258 { 3, "Bad Message Type"}, 259 { 0, NULL} 260 }; 261 262 static const struct tok bgp_notify_minor_open_values[] = { 263 { 1, "Unsupported Version Number"}, 264 { 2, "Bad Peer AS"}, 265 { 3, "Bad BGP Identifier"}, 266 { 4, "Unsupported Optional Parameter"}, 267 { 5, "Authentication Failure"}, 268 { 6, "Unacceptable Hold Time"}, 269 { 7, "Capability Message Error"}, 270 { 0, NULL} 271 }; 272 273 static const struct tok bgp_notify_minor_update_values[] = { 274 { 1, "Malformed Attribute List"}, 275 { 2, "Unrecognized Well-known Attribute"}, 276 { 3, "Missing Well-known Attribute"}, 277 { 4, "Attribute Flags Error"}, 278 { 5, "Attribute Length Error"}, 279 { 6, "Invalid ORIGIN Attribute"}, 280 { 7, "AS Routing Loop"}, 281 { 8, "Invalid NEXT_HOP Attribute"}, 282 { 9, "Optional Attribute Error"}, 283 { 10, "Invalid Network Field"}, 284 { 11, "Malformed AS_PATH"}, 285 { 0, NULL} 286 }; 287 288 static const struct tok bgp_notify_minor_cap_values[] = { 289 { 1, "Invalid Action Value" }, 290 { 2, "Invalid Capability Length" }, 291 { 3, "Malformed Capability Value" }, 292 { 4, "Unsupported Capability Code" }, 293 { 0, NULL } 294 }; 295 296 static const struct tok bgp_origin_values[] = { 297 { 0, "IGP"}, 298 { 1, "EGP"}, 299 { 2, "Incomplete"}, 300 { 0, NULL} 301 }; 302 303 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1 304 #define BGP_PMSI_TUNNEL_LDP_P2MP 2 305 #define BGP_PMSI_TUNNEL_PIM_SSM 3 306 #define BGP_PMSI_TUNNEL_PIM_SM 4 307 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5 308 #define BGP_PMSI_TUNNEL_INGRESS 6 309 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7 310 311 static const struct tok bgp_pmsi_tunnel_values[] = { 312 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"}, 313 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"}, 314 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"}, 315 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"}, 316 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"}, 317 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"}, 318 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"}, 319 { 0, NULL} 320 }; 321 322 static const struct tok bgp_pmsi_flag_values[] = { 323 { 0x01, "Leaf Information required"}, 324 { 0, NULL} 325 }; 326 327 328 /* Subsequent address family identifier, RFC2283 section 7 */ 329 #define SAFNUM_RES 0 330 #define SAFNUM_UNICAST 1 331 #define SAFNUM_MULTICAST 2 332 #define SAFNUM_UNIMULTICAST 3 333 /* labeled BGP RFC3107 */ 334 #define SAFNUM_LABUNICAST 4 335 /* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */ 336 #define SAFNUM_MULTICAST_VPN 5 337 #define SAFNUM_TUNNEL 64 /* XXX */ 338 #define SAFNUM_VPLS 65 /* XXX */ 339 /* draft-nalawade-idr-mdt-safi-03 */ 340 #define SAFNUM_MDT 66 341 /* Section 4.3.4 of draft-rosen-rfc2547bis-03.txt */ 342 #define SAFNUM_VPNUNICAST 128 343 #define SAFNUM_VPNMULTICAST 129 344 #define SAFNUM_VPNUNIMULTICAST 130 345 /* draft-marques-ppvpn-rt-constrain-01.txt */ 346 #define SAFNUM_RT_ROUTING_INFO 132 347 348 #define BGP_VPN_RD_LEN 8 349 350 static const struct tok bgp_safi_values[] = { 351 { SAFNUM_RES, "Reserved"}, 352 { SAFNUM_UNICAST, "Unicast"}, 353 { SAFNUM_MULTICAST, "Multicast"}, 354 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"}, 355 { SAFNUM_LABUNICAST, "labeled Unicast"}, 356 { SAFNUM_TUNNEL, "Tunnel"}, 357 { SAFNUM_VPLS, "VPLS"}, 358 { SAFNUM_MDT, "MDT"}, 359 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"}, 360 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"}, 361 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"}, 362 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"}, 363 { SAFNUM_MULTICAST_VPN, "Multicast VPN"}, 364 { 0, NULL } 365 }; 366 367 /* well-known community */ 368 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01 369 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02 370 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 371 372 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */ 373 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */ 374 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */ 375 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */ 376 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */ 377 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */ 378 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */ 379 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */ 380 /* rfc2547 bgp-mpls-vpns */ 381 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */ 382 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */ 383 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */ 384 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */ 385 386 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */ 387 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */ 388 389 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */ 390 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */ 391 392 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */ 393 394 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 395 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 396 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */ 397 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */ 398 399 400 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */ 401 #define BGP_EXT_COM_EIGRP_GEN 0x8800 402 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801 403 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802 404 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803 405 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804 406 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805 407 408 static const struct tok bgp_extd_comm_flag_values[] = { 409 { 0x8000, "vendor-specific"}, 410 { 0x4000, "non-transitive"}, 411 { 0, NULL}, 412 }; 413 414 static const struct tok bgp_extd_comm_subtype_values[] = { 415 { BGP_EXT_COM_RT_0, "target"}, 416 { BGP_EXT_COM_RT_1, "target"}, 417 { BGP_EXT_COM_RT_2, "target"}, 418 { BGP_EXT_COM_RO_0, "origin"}, 419 { BGP_EXT_COM_RO_1, "origin"}, 420 { BGP_EXT_COM_RO_2, "origin"}, 421 { BGP_EXT_COM_LINKBAND, "link-BW"}, 422 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"}, 423 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"}, 424 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"}, 425 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"}, 426 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"}, 427 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"}, 428 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"}, 429 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"}, 430 { BGP_EXT_COM_L2INFO, "layer2-info"}, 431 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" }, 432 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" }, 433 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" }, 434 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" }, 435 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" }, 436 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" }, 437 { BGP_EXT_COM_SOURCE_AS, "source-AS" }, 438 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"}, 439 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"}, 440 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"}, 441 { 0, NULL}, 442 }; 443 444 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */ 445 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */ 446 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */ 447 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */ 448 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */ 449 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/ 450 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */ 451 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */ 452 453 static const struct tok bgp_extd_comm_ospf_rtype_values[] = { 454 { BGP_OSPF_RTYPE_RTR, "Router" }, 455 { BGP_OSPF_RTYPE_NET, "Network" }, 456 { BGP_OSPF_RTYPE_SUM, "Summary" }, 457 { BGP_OSPF_RTYPE_EXT, "External" }, 458 { BGP_OSPF_RTYPE_NSSA,"NSSA External" }, 459 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" }, 460 { 0, NULL }, 461 }; 462 463 #define TOKBUFSIZE 128 464 static char astostr[20]; 465 466 /* 467 * as_printf 468 * 469 * Convert an AS number into a string and return string pointer. 470 * 471 * Bepending on bflag is set or not, AS number is converted into ASDOT notation 472 * or plain number notation. 473 * 474 */ 475 static char * 476 as_printf (char *str, int size, u_int asnum) 477 { 478 if (!bflag || asnum <= 0xFFFF) { 479 snprintf(str, size, "%u", asnum); 480 } else { 481 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF); 482 } 483 return str; 484 } 485 486 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv; 487 488 int 489 decode_prefix4(const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 490 { 491 struct in_addr addr; 492 u_int plen, plenbytes; 493 494 TCHECK(pptr[0]); 495 ITEMCHECK(1); 496 plen = pptr[0]; 497 if (32 < plen) 498 return -1; 499 itemlen -= 1; 500 501 memset(&addr, 0, sizeof(addr)); 502 plenbytes = (plen + 7) / 8; 503 TCHECK2(pptr[1], plenbytes); 504 ITEMCHECK(plenbytes); 505 memcpy(&addr, &pptr[1], plenbytes); 506 if (plen % 8) { 507 ((u_char *)&addr)[plenbytes - 1] &= 508 ((0xff00 >> (plen % 8)) & 0xff); 509 } 510 snprintf(buf, buflen, "%s/%d", getname((u_char *)&addr), plen); 511 return 1 + plenbytes; 512 513 trunc: 514 return -2; 515 516 badtlv: 517 return -3; 518 } 519 520 static int 521 decode_labeled_prefix4(const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 522 { 523 struct in_addr addr; 524 u_int plen, plenbytes; 525 526 /* prefix length and label = 4 bytes */ 527 TCHECK2(pptr[0], 4); 528 ITEMCHECK(4); 529 plen = pptr[0]; /* get prefix length */ 530 531 /* this is one of the weirdnesses of rfc3107 532 the label length (actually the label + COS bits) 533 is added to the prefix length; 534 we also do only read out just one label - 535 there is no real application for advertisement of 536 stacked labels in a a single BGP message 537 */ 538 539 if (24 > plen) 540 return -1; 541 542 plen-=24; /* adjust prefixlen - labellength */ 543 544 if (32 < plen) 545 return -1; 546 itemlen -= 4; 547 548 memset(&addr, 0, sizeof(addr)); 549 plenbytes = (plen + 7) / 8; 550 TCHECK2(pptr[4], plenbytes); 551 ITEMCHECK(plenbytes); 552 memcpy(&addr, &pptr[4], plenbytes); 553 if (plen % 8) { 554 ((u_char *)&addr)[plenbytes - 1] &= 555 ((0xff00 >> (plen % 8)) & 0xff); 556 } 557 /* the label may get offsetted by 4 bits so lets shift it right */ 558 snprintf(buf, buflen, "%s/%d, label:%u %s", 559 getname((u_char *)&addr), 560 plen, 561 EXTRACT_24BITS(pptr+1)>>4, 562 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 563 564 return 4 + plenbytes; 565 566 trunc: 567 return -2; 568 569 badtlv: 570 return -3; 571 } 572 573 /* 574 * bgp_vpn_ip_print 575 * 576 * print an ipv4 or ipv6 address into a buffer dependend on address length. 577 */ 578 static char * 579 bgp_vpn_ip_print (const u_char *pptr, u_int addr_length) { 580 581 /* worst case string is s fully formatted v6 address */ 582 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")]; 583 char *pos = addr; 584 585 switch(addr_length) { 586 case (sizeof(struct in_addr) << 3): /* 32 */ 587 TCHECK2(pptr[0], sizeof(struct in_addr)); 588 snprintf(pos, sizeof(addr), "%s", ipaddr_string(pptr)); 589 break; 590 #ifdef INET6 591 case (sizeof(struct in6_addr) << 3): /* 128 */ 592 TCHECK2(pptr[0], sizeof(struct in6_addr)); 593 snprintf(pos, sizeof(addr), "%s", ip6addr_string(pptr)); 594 break; 595 #endif 596 default: 597 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length); 598 break; 599 } 600 pos += strlen(pos); 601 602 trunc: 603 *(pos) = '\0'; 604 return (addr); 605 } 606 607 /* 608 * bgp_vpn_sg_print 609 * 610 * print an multicast s,g entry into a buffer. 611 * the s,g entry is encoded like this. 612 * 613 * +-----------------------------------+ 614 * | Multicast Source Length (1 octet) | 615 * +-----------------------------------+ 616 * | Multicast Source (Variable) | 617 * +-----------------------------------+ 618 * | Multicast Group Length (1 octet) | 619 * +-----------------------------------+ 620 * | Multicast Group (Variable) | 621 * +-----------------------------------+ 622 * 623 * return the number of bytes read from the wire. 624 */ 625 static int 626 bgp_vpn_sg_print (const u_char *pptr, char *buf, u_int buflen) { 627 628 u_int8_t addr_length; 629 u_int total_length, offset; 630 631 total_length = 0; 632 633 /* Source address length, encoded in bits */ 634 TCHECK2(pptr[0], 1); 635 addr_length = *pptr++; 636 637 /* Source address */ 638 TCHECK2(pptr[0], (addr_length >> 3)); 639 total_length += (addr_length >> 3) + 1; 640 offset = strlen(buf); 641 if (addr_length) { 642 snprintf(buf + offset, buflen - offset, ", Source %s", 643 bgp_vpn_ip_print(pptr, addr_length)); 644 pptr += (addr_length >> 3); 645 } 646 647 /* Group address length, encoded in bits */ 648 TCHECK2(pptr[0], 1); 649 addr_length = *pptr++; 650 651 /* Group address */ 652 TCHECK2(pptr[0], (addr_length >> 3)); 653 total_length += (addr_length >> 3) + 1; 654 offset = strlen(buf); 655 if (addr_length) { 656 snprintf(buf + offset, buflen - offset, ", Group %s", 657 bgp_vpn_ip_print(pptr, addr_length)); 658 pptr += (addr_length >> 3); 659 } 660 661 trunc: 662 return (total_length); 663 } 664 665 666 /* RDs and RTs share the same semantics 667 * we use bgp_vpn_rd_print for 668 * printing route targets inside a NLRI */ 669 char * 670 bgp_vpn_rd_print (const u_char *pptr) { 671 672 /* allocate space for the largest possible string */ 673 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")]; 674 char *pos = rd; 675 676 /* ok lets load the RD format */ 677 switch (EXTRACT_16BITS(pptr)) { 678 679 /* 2-byte-AS:number fmt*/ 680 case 0: 681 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)", 682 EXTRACT_16BITS(pptr+2), 683 EXTRACT_32BITS(pptr+4), 684 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7)); 685 break; 686 /* IP-address:AS fmt*/ 687 688 case 1: 689 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u", 690 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6)); 691 break; 692 693 /* 4-byte-AS:number fmt*/ 694 case 2: 695 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)", 696 as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)), 697 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4), 698 *(pptr+5), EXTRACT_16BITS(pptr+6)); 699 break; 700 default: 701 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format"); 702 break; 703 } 704 pos += strlen(pos); 705 *(pos) = '\0'; 706 return (rd); 707 } 708 709 static int 710 decode_rt_routing_info(const u_char *pptr, char *buf, u_int buflen) 711 { 712 u_int8_t route_target[8]; 713 u_int plen; 714 715 TCHECK(pptr[0]); 716 plen = pptr[0]; /* get prefix length */ 717 718 if (0 == plen) 719 return 1; /* default route target */ 720 721 if (32 > plen) 722 return -1; 723 724 plen-=32; /* adjust prefix length */ 725 726 if (64 < plen) 727 return -1; 728 729 memset(&route_target, 0, sizeof(route_target)); 730 TCHECK2(pptr[1], (plen + 7) / 8); 731 memcpy(&route_target, &pptr[1], (plen + 7) / 8); 732 if (plen % 8) { 733 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= 734 ((0xff00 >> (plen % 8)) & 0xff); 735 } 736 snprintf(buf, buflen, "origin AS: %s, route target %s", 737 as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)), 738 bgp_vpn_rd_print((u_char *)&route_target)); 739 740 return 5 + (plen + 7) / 8; 741 742 trunc: 743 return -2; 744 } 745 746 static int 747 decode_labeled_vpn_prefix4(const u_char *pptr, char *buf, u_int buflen) 748 { 749 struct in_addr addr; 750 u_int plen; 751 752 TCHECK(pptr[0]); 753 plen = pptr[0]; /* get prefix length */ 754 755 if ((24+64) > plen) 756 return -1; 757 758 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 759 760 if (32 < plen) 761 return -1; 762 763 memset(&addr, 0, sizeof(addr)); 764 TCHECK2(pptr[12], (plen + 7) / 8); 765 memcpy(&addr, &pptr[12], (plen + 7) / 8); 766 if (plen % 8) { 767 ((u_char *)&addr)[(plen + 7) / 8 - 1] &= 768 ((0xff00 >> (plen % 8)) & 0xff); 769 } 770 /* the label may get offsetted by 4 bits so lets shift it right */ 771 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 772 bgp_vpn_rd_print(pptr+4), 773 getname((u_char *)&addr), 774 plen, 775 EXTRACT_24BITS(pptr+1)>>4, 776 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 777 778 return 12 + (plen + 7) / 8; 779 780 trunc: 781 return -2; 782 } 783 784 /* 785 * +-------------------------------+ 786 * | | 787 * | RD:IPv4-address (12 octets) | 788 * | | 789 * +-------------------------------+ 790 * | MDT Group-address (4 octets) | 791 * +-------------------------------+ 792 */ 793 794 #define MDT_VPN_NLRI_LEN 16 795 796 static int 797 decode_mdt_vpn_nlri(const u_char *pptr, char *buf, u_int buflen) 798 { 799 800 const u_char *rd; 801 const u_char *vpn_ip; 802 803 TCHECK(pptr[0]); 804 805 /* if the NLRI is not predefined length, quit.*/ 806 if (*pptr != MDT_VPN_NLRI_LEN * NBBY) 807 return -1; 808 pptr++; 809 810 /* RD */ 811 TCHECK2(pptr[0], 8); 812 rd = pptr; 813 pptr+=8; 814 815 /* IPv4 address */ 816 TCHECK2(pptr[0], sizeof(struct in_addr)); 817 vpn_ip = pptr; 818 pptr+=sizeof(struct in_addr); 819 820 /* MDT Group Address */ 821 TCHECK2(pptr[0], sizeof(struct in_addr)); 822 823 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s", 824 bgp_vpn_rd_print(rd), ipaddr_string(vpn_ip), ipaddr_string(pptr)); 825 826 return MDT_VPN_NLRI_LEN + 1; 827 828 trunc: 829 830 return -2; 831 } 832 833 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1 834 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2 835 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3 836 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4 837 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5 838 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6 839 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7 840 841 static const struct tok bgp_multicast_vpn_route_type_values[] = { 842 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"}, 843 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"}, 844 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"}, 845 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"}, 846 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"}, 847 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"}, 848 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"}, 849 }; 850 851 static int 852 decode_multicast_vpn(const u_char *pptr, char *buf, u_int buflen) 853 { 854 u_int8_t route_type, route_length, addr_length, sg_length; 855 u_int offset; 856 857 TCHECK2(pptr[0], 2); 858 route_type = *pptr++; 859 route_length = *pptr++; 860 861 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", 862 tok2str(bgp_multicast_vpn_route_type_values, 863 "Unknown", route_type), 864 route_type, route_length); 865 866 switch(route_type) { 867 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: 868 TCHECK2(pptr[0], BGP_VPN_RD_LEN); 869 offset = strlen(buf); 870 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", 871 bgp_vpn_rd_print(pptr), 872 bgp_vpn_ip_print(pptr + BGP_VPN_RD_LEN, 873 (route_length - BGP_VPN_RD_LEN) << 3)); 874 break; 875 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: 876 TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); 877 offset = strlen(buf); 878 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 879 bgp_vpn_rd_print(pptr), 880 as_printf(astostr, sizeof(astostr), 881 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 882 break; 883 884 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: 885 TCHECK2(pptr[0], BGP_VPN_RD_LEN); 886 offset = strlen(buf); 887 snprintf(buf + offset, buflen - offset, ", RD: %s", 888 bgp_vpn_rd_print(pptr)); 889 pptr += BGP_VPN_RD_LEN; 890 891 sg_length = bgp_vpn_sg_print(pptr, buf, buflen); 892 addr_length = route_length - sg_length; 893 894 TCHECK2(pptr[0], addr_length); 895 offset = strlen(buf); 896 snprintf(buf + offset, buflen - offset, ", Originator %s", 897 bgp_vpn_ip_print(pptr, addr_length << 3)); 898 break; 899 900 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: 901 TCHECK2(pptr[0], BGP_VPN_RD_LEN); 902 offset = strlen(buf); 903 snprintf(buf + offset, buflen - offset, ", RD: %s", 904 bgp_vpn_rd_print(pptr)); 905 pptr += BGP_VPN_RD_LEN; 906 907 bgp_vpn_sg_print(pptr, buf, buflen); 908 break; 909 910 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ 911 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: 912 TCHECK2(pptr[0], BGP_VPN_RD_LEN); 913 offset = strlen(buf); 914 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 915 bgp_vpn_rd_print(pptr), 916 as_printf(astostr, sizeof(astostr), 917 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 918 pptr += BGP_VPN_RD_LEN; 919 920 bgp_vpn_sg_print(pptr, buf, buflen); 921 break; 922 923 /* 924 * no per route-type printing yet. 925 */ 926 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: 927 default: 928 break; 929 } 930 931 return route_length + 2; 932 933 trunc: 934 return -2; 935 } 936 937 /* 938 * As I remember, some versions of systems have an snprintf() that 939 * returns -1 if the buffer would have overflowed. If the return 940 * value is negative, set buflen to 0, to indicate that we've filled 941 * the buffer up. 942 * 943 * If the return value is greater than buflen, that means that 944 * the buffer would have overflowed; again, set buflen to 0 in 945 * that case. 946 */ 947 #define UPDATE_BUF_BUFLEN(buf, buflen, strlen) \ 948 if (strlen<0) \ 949 buflen=0; \ 950 else if ((u_int)strlen>buflen) \ 951 buflen=0; \ 952 else { \ 953 buflen-=strlen; \ 954 buf+=strlen; \ 955 } 956 957 static int 958 decode_labeled_vpn_l2(const u_char *pptr, char *buf, u_int buflen) 959 { 960 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len; 961 962 TCHECK2(pptr[0], 2); 963 plen=EXTRACT_16BITS(pptr); 964 tlen=plen; 965 pptr+=2; 966 /* Old and new L2VPN NLRI share AFI/SAFI 967 * -> Assume a 12 Byte-length NLRI is auto-discovery-only 968 * and > 17 as old format. Complain for the middle case 969 */ 970 if (plen==12) { 971 /* assume AD-only with RD, BGPNH */ 972 TCHECK2(pptr[0],12); 973 buf[0]='\0'; 974 strlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s", 975 bgp_vpn_rd_print(pptr), 976 /* need something like getname() here */ 977 getname(pptr+8) 978 ); 979 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 980 pptr+=12; 981 tlen-=12; 982 return plen; 983 } else if (plen>17) { 984 /* assume old format */ 985 /* RD, ID, LBLKOFF, LBLBASE */ 986 987 TCHECK2(pptr[0],15); 988 buf[0]='\0'; 989 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", 990 bgp_vpn_rd_print(pptr), 991 EXTRACT_16BITS(pptr+8), 992 EXTRACT_16BITS(pptr+10), 993 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ 994 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 995 pptr+=15; 996 tlen-=15; 997 998 /* ok now the variable part - lets read out TLVs*/ 999 while (tlen>0) { 1000 if (tlen < 3) 1001 return -1; 1002 TCHECK2(pptr[0], 3); 1003 tlv_type=*pptr++; 1004 tlv_len=EXTRACT_16BITS(pptr); 1005 ttlv_len=tlv_len; 1006 pptr+=2; 1007 1008 switch(tlv_type) { 1009 case 1: 1010 if (buflen!=0) { 1011 strlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", 1012 tlv_type, 1013 tlv_len); 1014 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1015 } 1016 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */ 1017 while (ttlv_len>0) { 1018 TCHECK(pptr[0]); 1019 if (buflen!=0) { 1020 strlen=snprintf(buf,buflen, "%02x",*pptr++); 1021 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1022 } 1023 ttlv_len--; 1024 } 1025 break; 1026 default: 1027 if (buflen!=0) { 1028 strlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", 1029 tlv_type, 1030 tlv_len); 1031 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1032 } 1033 break; 1034 } 1035 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */ 1036 } 1037 return plen+2; 1038 1039 } else { 1040 /* complain bitterly ? */ 1041 /* fall through */ 1042 goto trunc; 1043 } 1044 1045 trunc: 1046 return -2; 1047 } 1048 1049 #ifdef INET6 1050 int 1051 decode_prefix6(const u_char *pd, u_int itemlen, char *buf, u_int buflen) 1052 { 1053 struct in6_addr addr; 1054 u_int plen, plenbytes; 1055 1056 TCHECK(pd[0]); 1057 ITEMCHECK(1); 1058 plen = pd[0]; 1059 if (128 < plen) 1060 return -1; 1061 itemlen -= 1; 1062 1063 memset(&addr, 0, sizeof(addr)); 1064 plenbytes = (plen + 7) / 8; 1065 TCHECK2(pd[1], plenbytes); 1066 ITEMCHECK(plenbytes); 1067 memcpy(&addr, &pd[1], plenbytes); 1068 if (plen % 8) { 1069 addr.s6_addr[plenbytes - 1] &= 1070 ((0xff00 >> (plen % 8)) & 0xff); 1071 } 1072 snprintf(buf, buflen, "%s/%d", getname6((u_char *)&addr), plen); 1073 return 1 + plenbytes; 1074 1075 trunc: 1076 return -2; 1077 1078 badtlv: 1079 return -3; 1080 } 1081 1082 static int 1083 decode_labeled_prefix6(const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 1084 { 1085 struct in6_addr addr; 1086 u_int plen, plenbytes; 1087 1088 /* prefix length and label = 4 bytes */ 1089 TCHECK2(pptr[0], 4); 1090 ITEMCHECK(4); 1091 plen = pptr[0]; /* get prefix length */ 1092 1093 if (24 > plen) 1094 return -1; 1095 1096 plen-=24; /* adjust prefixlen - labellength */ 1097 1098 if (128 < plen) 1099 return -1; 1100 itemlen -= 4; 1101 1102 memset(&addr, 0, sizeof(addr)); 1103 plenbytes = (plen + 7) / 8; 1104 TCHECK2(pptr[4], plenbytes); 1105 memcpy(&addr, &pptr[4], plenbytes); 1106 if (plen % 8) { 1107 addr.s6_addr[plenbytes - 1] &= 1108 ((0xff00 >> (plen % 8)) & 0xff); 1109 } 1110 /* the label may get offsetted by 4 bits so lets shift it right */ 1111 snprintf(buf, buflen, "%s/%d, label:%u %s", 1112 getname6((u_char *)&addr), 1113 plen, 1114 EXTRACT_24BITS(pptr+1)>>4, 1115 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1116 1117 return 4 + plenbytes; 1118 1119 trunc: 1120 return -2; 1121 1122 badtlv: 1123 return -3; 1124 } 1125 1126 static int 1127 decode_labeled_vpn_prefix6(const u_char *pptr, char *buf, u_int buflen) 1128 { 1129 struct in6_addr addr; 1130 u_int plen; 1131 1132 TCHECK(pptr[0]); 1133 plen = pptr[0]; /* get prefix length */ 1134 1135 if ((24+64) > plen) 1136 return -1; 1137 1138 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1139 1140 if (128 < plen) 1141 return -1; 1142 1143 memset(&addr, 0, sizeof(addr)); 1144 TCHECK2(pptr[12], (plen + 7) / 8); 1145 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1146 if (plen % 8) { 1147 addr.s6_addr[(plen + 7) / 8 - 1] &= 1148 ((0xff00 >> (plen % 8)) & 0xff); 1149 } 1150 /* the label may get offsetted by 4 bits so lets shift it right */ 1151 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1152 bgp_vpn_rd_print(pptr+4), 1153 getname6((u_char *)&addr), 1154 plen, 1155 EXTRACT_24BITS(pptr+1)>>4, 1156 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1157 1158 return 12 + (plen + 7) / 8; 1159 1160 trunc: 1161 return -2; 1162 } 1163 #endif 1164 1165 static int 1166 decode_clnp_prefix(const u_char *pptr, char *buf, u_int buflen) 1167 { 1168 u_int8_t addr[19]; 1169 u_int plen; 1170 1171 TCHECK(pptr[0]); 1172 plen = pptr[0]; /* get prefix length */ 1173 1174 if (152 < plen) 1175 return -1; 1176 1177 memset(&addr, 0, sizeof(addr)); 1178 TCHECK2(pptr[4], (plen + 7) / 8); 1179 memcpy(&addr, &pptr[4], (plen + 7) / 8); 1180 if (plen % 8) { 1181 addr[(plen + 7) / 8 - 1] &= 1182 ((0xff00 >> (plen % 8)) & 0xff); 1183 } 1184 snprintf(buf, buflen, "%s/%d", 1185 isonsap_string(addr,(plen + 7) / 8), 1186 plen); 1187 1188 return 1 + (plen + 7) / 8; 1189 1190 trunc: 1191 return -2; 1192 } 1193 1194 static int 1195 decode_labeled_vpn_clnp_prefix(const u_char *pptr, char *buf, u_int buflen) 1196 { 1197 u_int8_t addr[19]; 1198 u_int plen; 1199 1200 TCHECK(pptr[0]); 1201 plen = pptr[0]; /* get prefix length */ 1202 1203 if ((24+64) > plen) 1204 return -1; 1205 1206 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1207 1208 if (152 < plen) 1209 return -1; 1210 1211 memset(&addr, 0, sizeof(addr)); 1212 TCHECK2(pptr[12], (plen + 7) / 8); 1213 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1214 if (plen % 8) { 1215 addr[(plen + 7) / 8 - 1] &= 1216 ((0xff00 >> (plen % 8)) & 0xff); 1217 } 1218 /* the label may get offsetted by 4 bits so lets shift it right */ 1219 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1220 bgp_vpn_rd_print(pptr+4), 1221 isonsap_string(addr,(plen + 7) / 8), 1222 plen, 1223 EXTRACT_24BITS(pptr+1)>>4, 1224 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1225 1226 return 12 + (plen + 7) / 8; 1227 1228 trunc: 1229 return -2; 1230 } 1231 1232 /* 1233 * bgp_attr_get_as_size 1234 * 1235 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as 1236 * both Old speakers that do not support 4 byte AS, and the new speakers that do 1237 * support, exchange AS-Path with the same path-attribute type value 0x02. 1238 */ 1239 static int 1240 bgp_attr_get_as_size (u_int8_t bgpa_type, const u_char *pptr, int len) 1241 { 1242 const u_char *tptr = pptr; 1243 1244 /* 1245 * If the path attribute is the optional AS4 path type, then we already 1246 * know, that ASs must be encoded in 4 byte format. 1247 */ 1248 if (bgpa_type == BGPTYPE_AS4_PATH) { 1249 return 4; 1250 } 1251 1252 /* 1253 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path 1254 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes 1255 * each. 1256 */ 1257 while (tptr < pptr + len) { 1258 TCHECK(tptr[0]); 1259 1260 /* 1261 * If we do not find a valid segment type, our guess might be wrong. 1262 */ 1263 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) { 1264 goto trunc; 1265 } 1266 TCHECK(tptr[1]); 1267 tptr += 2 + tptr[1] * 2; 1268 } 1269 1270 /* 1271 * If we correctly reached end of the AS path attribute data content, 1272 * then most likely ASs were indeed encoded as 2 bytes. 1273 */ 1274 if (tptr == pptr + len) { 1275 return 2; 1276 } 1277 1278 trunc: 1279 1280 /* 1281 * We can come here, either we did not have enough data, or if we 1282 * try to decode 4 byte ASs in 2 byte format. Either way, return 4, 1283 * so that calller can try to decode each AS as of 4 bytes. If indeed 1284 * there was not enough data, it will crib and end the parse anyways. 1285 */ 1286 return 4; 1287 } 1288 1289 static int 1290 bgp_attr_print(u_int atype, const u_char *pptr, u_int len) 1291 { 1292 int i; 1293 u_int16_t af; 1294 u_int8_t safi, snpa, nhlen; 1295 union { /* copy buffer for bandwidth values */ 1296 float f; 1297 u_int32_t i; 1298 } bw; 1299 int advance; 1300 u_int tlen; 1301 const u_char *tptr; 1302 char buf[MAXHOSTNAMELEN + 100]; 1303 char tokbuf[TOKBUFSIZE]; 1304 int as_size; 1305 1306 tptr = pptr; 1307 tlen=len; 1308 1309 switch (atype) { 1310 case BGPTYPE_ORIGIN: 1311 if (len != 1) 1312 printf("invalid len"); 1313 else { 1314 TCHECK(*tptr); 1315 printf("%s", tok2strbuf(bgp_origin_values, 1316 "Unknown Origin Typecode", 1317 tptr[0], 1318 tokbuf, sizeof(tokbuf))); 1319 } 1320 break; 1321 1322 1323 /* 1324 * Process AS4 byte path and AS2 byte path attributes here. 1325 */ 1326 case BGPTYPE_AS4_PATH: 1327 case BGPTYPE_AS_PATH: 1328 if (len % 2) { 1329 printf("invalid len"); 1330 break; 1331 } 1332 if (!len) { 1333 printf("empty"); 1334 break; 1335 } 1336 1337 /* 1338 * BGP updates exchanged between New speakers that support 4 1339 * byte AS, ASs are always encoded in 4 bytes. There is no 1340 * definitive way to find this, just by the packet's 1341 * contents. So, check for packet's TLV's sanity assuming 1342 * 2 bytes first, and it does not pass, assume that ASs are 1343 * encoded in 4 bytes format and move on. 1344 */ 1345 as_size = bgp_attr_get_as_size(atype, pptr, len); 1346 1347 while (tptr < pptr + len) { 1348 TCHECK(tptr[0]); 1349 printf("%s", tok2strbuf(bgp_as_path_segment_open_values, 1350 "?", tptr[0], 1351 tokbuf, sizeof(tokbuf))); 1352 for (i = 0; i < tptr[1] * as_size; i += as_size) { 1353 TCHECK2(tptr[2 + i], as_size); 1354 printf("%s ", 1355 as_printf(astostr, sizeof(astostr), 1356 as_size == 2 ? 1357 EXTRACT_16BITS(&tptr[2 + i]) : 1358 EXTRACT_32BITS(&tptr[2 + i]))); 1359 } 1360 TCHECK(tptr[0]); 1361 printf("%s", tok2strbuf(bgp_as_path_segment_close_values, 1362 "?", tptr[0], 1363 tokbuf, sizeof(tokbuf))); 1364 TCHECK(tptr[1]); 1365 tptr += 2 + tptr[1] * as_size; 1366 } 1367 break; 1368 case BGPTYPE_NEXT_HOP: 1369 if (len != 4) 1370 printf("invalid len"); 1371 else { 1372 TCHECK2(tptr[0], 4); 1373 printf("%s", getname(tptr)); 1374 } 1375 break; 1376 case BGPTYPE_MULTI_EXIT_DISC: 1377 case BGPTYPE_LOCAL_PREF: 1378 if (len != 4) 1379 printf("invalid len"); 1380 else { 1381 TCHECK2(tptr[0], 4); 1382 printf("%u", EXTRACT_32BITS(tptr)); 1383 } 1384 break; 1385 case BGPTYPE_ATOMIC_AGGREGATE: 1386 if (len != 0) 1387 printf("invalid len"); 1388 break; 1389 case BGPTYPE_AGGREGATOR: 1390 1391 /* 1392 * Depending on the AS encoded is of 2 bytes or of 4 bytes, 1393 * the length of this PA can be either 6 bytes or 8 bytes. 1394 */ 1395 if (len != 6 && len != 8) { 1396 printf("invalid len"); 1397 break; 1398 } 1399 TCHECK2(tptr[0], len); 1400 if (len == 6) { 1401 printf(" AS #%s, origin %s", 1402 as_printf(astostr, sizeof(astostr), EXTRACT_16BITS(tptr)), 1403 getname(tptr + 2)); 1404 } else { 1405 printf(" AS #%s, origin %s", 1406 as_printf(astostr, sizeof(astostr), 1407 EXTRACT_32BITS(tptr)), getname(tptr + 4)); 1408 } 1409 break; 1410 case BGPTYPE_AGGREGATOR4: 1411 if (len != 8) { 1412 printf("invalid len"); 1413 break; 1414 } 1415 TCHECK2(tptr[0], 8); 1416 printf(" AS #%s, origin %s", 1417 as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(tptr)), 1418 getname(tptr + 4)); 1419 break; 1420 case BGPTYPE_COMMUNITIES: 1421 if (len % 4) { 1422 printf("invalid len"); 1423 break; 1424 } 1425 while (tlen>0) { 1426 u_int32_t comm; 1427 TCHECK2(tptr[0], 4); 1428 comm = EXTRACT_32BITS(tptr); 1429 switch (comm) { 1430 case BGP_COMMUNITY_NO_EXPORT: 1431 printf(" NO_EXPORT"); 1432 break; 1433 case BGP_COMMUNITY_NO_ADVERT: 1434 printf(" NO_ADVERTISE"); 1435 break; 1436 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: 1437 printf(" NO_EXPORT_SUBCONFED"); 1438 break; 1439 default: 1440 printf("%u:%u%s", 1441 (comm >> 16) & 0xffff, 1442 comm & 0xffff, 1443 (tlen>4) ? ", " : ""); 1444 break; 1445 } 1446 tlen -=4; 1447 tptr +=4; 1448 } 1449 break; 1450 case BGPTYPE_ORIGINATOR_ID: 1451 if (len != 4) { 1452 printf("invalid len"); 1453 break; 1454 } 1455 TCHECK2(tptr[0], 4); 1456 printf("%s",getname(tptr)); 1457 break; 1458 case BGPTYPE_CLUSTER_LIST: 1459 if (len % 4) { 1460 printf("invalid len"); 1461 break; 1462 } 1463 while (tlen>0) { 1464 TCHECK2(tptr[0], 4); 1465 printf("%s%s", 1466 getname(tptr), 1467 (tlen>4) ? ", " : ""); 1468 tlen -=4; 1469 tptr +=4; 1470 } 1471 break; 1472 case BGPTYPE_MP_REACH_NLRI: 1473 TCHECK2(tptr[0], 3); 1474 af = EXTRACT_16BITS(tptr); 1475 safi = tptr[2]; 1476 1477 printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1478 tok2strbuf(af_values, "Unknown AFI", af, 1479 tokbuf, sizeof(tokbuf)), 1480 af, 1481 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1482 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi, 1483 tokbuf, sizeof(tokbuf)), 1484 safi); 1485 1486 switch(af<<8 | safi) { 1487 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1488 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1489 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1490 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1491 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1492 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1493 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1494 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1495 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1496 case (AFNUM_INET<<8 | SAFNUM_MDT): 1497 #ifdef INET6 1498 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1499 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1500 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1501 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1502 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1503 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1504 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1505 #endif 1506 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1507 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1508 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1509 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1510 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1511 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1512 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1513 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1514 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1515 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1516 break; 1517 default: 1518 TCHECK2(tptr[0], tlen); 1519 printf("\n\t no AFI %u / SAFI %u decoder",af,safi); 1520 if (vflag <= 1) 1521 print_unknown_data(tptr,"\n\t ",tlen); 1522 goto done; 1523 break; 1524 } 1525 1526 tptr +=3; 1527 1528 TCHECK(tptr[0]); 1529 nhlen = tptr[0]; 1530 tlen = nhlen; 1531 tptr++; 1532 1533 if (tlen) { 1534 int nnh = 0; 1535 printf("\n\t nexthop: "); 1536 while (tlen > 0) { 1537 if ( nnh++ > 0 ) { 1538 printf( ", " ); 1539 } 1540 switch(af<<8 | safi) { 1541 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1542 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1543 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1544 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1545 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1546 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1547 case (AFNUM_INET<<8 | SAFNUM_MDT): 1548 if (tlen < (int)sizeof(struct in_addr)) { 1549 printf("invalid len"); 1550 tlen = 0; 1551 } else { 1552 TCHECK2(tptr[0], sizeof(struct in_addr)); 1553 printf("%s",getname(tptr)); 1554 tlen -= sizeof(struct in_addr); 1555 tptr += sizeof(struct in_addr); 1556 } 1557 break; 1558 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1559 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1560 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1561 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { 1562 printf("invalid len"); 1563 tlen = 0; 1564 } else { 1565 TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1566 printf("RD: %s, %s", 1567 bgp_vpn_rd_print(tptr), 1568 getname(tptr+BGP_VPN_RD_LEN)); 1569 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1570 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1571 } 1572 break; 1573 #ifdef INET6 1574 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1575 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1576 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1577 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1578 if (tlen < (int)sizeof(struct in6_addr)) { 1579 printf("invalid len"); 1580 tlen = 0; 1581 } else { 1582 TCHECK2(tptr[0], sizeof(struct in6_addr)); 1583 printf("%s", getname6(tptr)); 1584 tlen -= sizeof(struct in6_addr); 1585 tptr += sizeof(struct in6_addr); 1586 } 1587 break; 1588 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1589 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1590 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1591 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { 1592 printf("invalid len"); 1593 tlen = 0; 1594 } else { 1595 TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1596 printf("RD: %s, %s", 1597 bgp_vpn_rd_print(tptr), 1598 getname6(tptr+BGP_VPN_RD_LEN)); 1599 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1600 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1601 } 1602 break; 1603 #endif 1604 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1605 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1606 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1607 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1608 if (tlen < (int)sizeof(struct in_addr)) { 1609 printf("invalid len"); 1610 tlen = 0; 1611 } else { 1612 TCHECK2(tptr[0], sizeof(struct in_addr)); 1613 printf("%s", getname(tptr)); 1614 tlen -= (sizeof(struct in_addr)); 1615 tptr += (sizeof(struct in_addr)); 1616 } 1617 break; 1618 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1619 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1620 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1621 TCHECK2(tptr[0], tlen); 1622 printf("%s",isonsap_string(tptr,tlen)); 1623 tptr += tlen; 1624 tlen = 0; 1625 break; 1626 1627 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1628 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1629 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1630 if (tlen < BGP_VPN_RD_LEN+1) { 1631 printf("invalid len"); 1632 tlen = 0; 1633 } else { 1634 TCHECK2(tptr[0], tlen); 1635 printf("RD: %s, %s", 1636 bgp_vpn_rd_print(tptr), 1637 isonsap_string(tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)); 1638 /* rfc986 mapped IPv4 address ? */ 1639 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601) 1640 printf(" = %s", getname(tptr+BGP_VPN_RD_LEN+4)); 1641 #ifdef INET6 1642 /* rfc1888 mapped IPv6 address ? */ 1643 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000) 1644 printf(" = %s", getname6(tptr+BGP_VPN_RD_LEN+3)); 1645 #endif 1646 tptr += tlen; 1647 tlen = 0; 1648 } 1649 break; 1650 default: 1651 TCHECK2(tptr[0], tlen); 1652 printf("no AFI %u/SAFI %u decoder",af,safi); 1653 if (vflag <= 1) 1654 print_unknown_data(tptr,"\n\t ",tlen); 1655 tptr += tlen; 1656 tlen = 0; 1657 goto done; 1658 break; 1659 } 1660 } 1661 } 1662 printf(", nh-length: %u", nhlen); 1663 tptr += tlen; 1664 1665 TCHECK(tptr[0]); 1666 snpa = tptr[0]; 1667 tptr++; 1668 1669 if (snpa) { 1670 printf("\n\t %u SNPA", snpa); 1671 for (/*nothing*/; snpa > 0; snpa--) { 1672 TCHECK(tptr[0]); 1673 printf("\n\t %d bytes", tptr[0]); 1674 tptr += tptr[0] + 1; 1675 } 1676 } else { 1677 printf(", no SNPA"); 1678 } 1679 1680 while (len - (tptr - pptr) > 0) { 1681 switch (af<<8 | safi) { 1682 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1683 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1684 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1685 advance = decode_prefix4(tptr, len, buf, sizeof(buf)); 1686 if (advance == -1) 1687 printf("\n\t (illegal prefix length)"); 1688 else if (advance == -2) 1689 goto trunc; 1690 else if (advance == -3) 1691 break; /* bytes left, but not enough */ 1692 else 1693 printf("\n\t %s", buf); 1694 break; 1695 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1696 advance = decode_labeled_prefix4(tptr, len, buf, sizeof(buf)); 1697 if (advance == -1) 1698 printf("\n\t (illegal prefix length)"); 1699 else if (advance == -2) 1700 goto trunc; 1701 else if (advance == -3) 1702 break; /* bytes left, but not enough */ 1703 else 1704 printf("\n\t %s", buf); 1705 break; 1706 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1707 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1708 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1709 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf)); 1710 if (advance == -1) 1711 printf("\n\t (illegal prefix length)"); 1712 else if (advance == -2) 1713 goto trunc; 1714 else 1715 printf("\n\t %s", buf); 1716 break; 1717 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1718 advance = decode_rt_routing_info(tptr, buf, sizeof(buf)); 1719 if (advance == -1) 1720 printf("\n\t (illegal prefix length)"); 1721 else if (advance == -2) 1722 goto trunc; 1723 else 1724 printf("\n\t %s", buf); 1725 break; 1726 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1727 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1728 advance = decode_multicast_vpn(tptr, buf, sizeof(buf)); 1729 if (advance == -1) 1730 printf("\n\t (illegal prefix length)"); 1731 else if (advance == -2) 1732 goto trunc; 1733 else 1734 printf("\n\t %s", buf); 1735 break; 1736 1737 case (AFNUM_INET<<8 | SAFNUM_MDT): 1738 advance = decode_mdt_vpn_nlri(tptr, buf, sizeof(buf)); 1739 if (advance == -1) 1740 printf("\n\t (illegal prefix length)"); 1741 else if (advance == -2) 1742 goto trunc; 1743 else 1744 printf("\n\t %s", buf); 1745 break; 1746 #ifdef INET6 1747 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1748 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1749 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1750 advance = decode_prefix6(tptr, len, buf, sizeof(buf)); 1751 if (advance == -1) 1752 printf("\n\t (illegal prefix length)"); 1753 else if (advance == -2) 1754 goto trunc; 1755 else if (advance == -3) 1756 break; /* bytes left, but not enough */ 1757 else 1758 printf("\n\t %s", buf); 1759 break; 1760 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1761 advance = decode_labeled_prefix6(tptr, len, buf, sizeof(buf)); 1762 if (advance == -1) 1763 printf("\n\t (illegal prefix length)"); 1764 else if (advance == -2) 1765 goto trunc; 1766 else if (advance == -3) 1767 break; /* bytes left, but not enough */ 1768 else 1769 printf("\n\t %s", buf); 1770 break; 1771 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1772 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1773 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1774 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf)); 1775 if (advance == -1) 1776 printf("\n\t (illegal prefix length)"); 1777 else if (advance == -2) 1778 goto trunc; 1779 else 1780 printf("\n\t %s", buf); 1781 break; 1782 #endif 1783 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1784 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1785 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1786 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1787 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf)); 1788 if (advance == -1) 1789 printf("\n\t (illegal length)"); 1790 else if (advance == -2) 1791 goto trunc; 1792 else 1793 printf("\n\t %s", buf); 1794 break; 1795 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1796 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1797 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1798 advance = decode_clnp_prefix(tptr, buf, sizeof(buf)); 1799 if (advance == -1) 1800 printf("\n\t (illegal prefix length)"); 1801 else if (advance == -2) 1802 goto trunc; 1803 else 1804 printf("\n\t %s", buf); 1805 break; 1806 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1807 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1808 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1809 advance = decode_labeled_vpn_clnp_prefix(tptr, buf, sizeof(buf)); 1810 if (advance == -1) 1811 printf("\n\t (illegal prefix length)"); 1812 else if (advance == -2) 1813 goto trunc; 1814 else 1815 printf("\n\t %s", buf); 1816 break; 1817 default: 1818 TCHECK2(*tptr,tlen); 1819 printf("\n\t no AFI %u / SAFI %u decoder",af,safi); 1820 if (vflag <= 1) 1821 print_unknown_data(tptr,"\n\t ",tlen); 1822 advance = 0; 1823 tptr = pptr + len; 1824 break; 1825 } 1826 if (advance < 0) 1827 break; 1828 tptr += advance; 1829 } 1830 done: 1831 break; 1832 1833 case BGPTYPE_MP_UNREACH_NLRI: 1834 TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE); 1835 af = EXTRACT_16BITS(tptr); 1836 safi = tptr[2]; 1837 1838 printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1839 tok2strbuf(af_values, "Unknown AFI", af, 1840 tokbuf, sizeof(tokbuf)), 1841 af, 1842 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1843 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi, 1844 tokbuf, sizeof(tokbuf)), 1845 safi); 1846 1847 if (len == BGP_MP_NLRI_MINSIZE) 1848 printf("\n\t End-of-Rib Marker (empty NLRI)"); 1849 1850 tptr += 3; 1851 1852 while (len - (tptr - pptr) > 0) { 1853 switch (af<<8 | safi) { 1854 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1855 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1856 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1857 advance = decode_prefix4(tptr, len, buf, sizeof(buf)); 1858 if (advance == -1) 1859 printf("\n\t (illegal prefix length)"); 1860 else if (advance == -2) 1861 goto trunc; 1862 else if (advance == -3) 1863 break; /* bytes left, but not enough */ 1864 else 1865 printf("\n\t %s", buf); 1866 break; 1867 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1868 advance = decode_labeled_prefix4(tptr, len, buf, sizeof(buf)); 1869 if (advance == -1) 1870 printf("\n\t (illegal prefix length)"); 1871 else if (advance == -2) 1872 goto trunc; 1873 else if (advance == -3) 1874 break; /* bytes left, but not enough */ 1875 else 1876 printf("\n\t %s", buf); 1877 break; 1878 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1879 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1880 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1881 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf)); 1882 if (advance == -1) 1883 printf("\n\t (illegal prefix length)"); 1884 else if (advance == -2) 1885 goto trunc; 1886 else 1887 printf("\n\t %s", buf); 1888 break; 1889 #ifdef INET6 1890 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1891 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1892 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1893 advance = decode_prefix6(tptr, len, buf, sizeof(buf)); 1894 if (advance == -1) 1895 printf("\n\t (illegal prefix length)"); 1896 else if (advance == -2) 1897 goto trunc; 1898 else if (advance == -3) 1899 break; /* bytes left, but not enough */ 1900 else 1901 printf("\n\t %s", buf); 1902 break; 1903 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1904 advance = decode_labeled_prefix6(tptr, len, buf, sizeof(buf)); 1905 if (advance == -1) 1906 printf("\n\t (illegal prefix length)"); 1907 else if (advance == -2) 1908 goto trunc; 1909 else if (advance == -3) 1910 break; /* bytes left, but not enough */ 1911 else 1912 printf("\n\t %s", buf); 1913 break; 1914 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1915 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1916 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1917 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf)); 1918 if (advance == -1) 1919 printf("\n\t (illegal prefix length)"); 1920 else if (advance == -2) 1921 goto trunc; 1922 else 1923 printf("\n\t %s", buf); 1924 break; 1925 #endif 1926 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1927 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1928 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1929 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1930 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf)); 1931 if (advance == -1) 1932 printf("\n\t (illegal length)"); 1933 else if (advance == -2) 1934 goto trunc; 1935 else 1936 printf("\n\t %s", buf); 1937 break; 1938 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1939 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1940 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1941 advance = decode_clnp_prefix(tptr, buf, sizeof(buf)); 1942 if (advance == -1) 1943 printf("\n\t (illegal prefix length)"); 1944 else if (advance == -2) 1945 goto trunc; 1946 else 1947 printf("\n\t %s", buf); 1948 break; 1949 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1950 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1951 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1952 advance = decode_labeled_vpn_clnp_prefix(tptr, buf, sizeof(buf)); 1953 if (advance == -1) 1954 printf("\n\t (illegal prefix length)"); 1955 else if (advance == -2) 1956 goto trunc; 1957 else 1958 printf("\n\t %s", buf); 1959 break; 1960 case (AFNUM_INET<<8 | SAFNUM_MDT): 1961 advance = decode_mdt_vpn_nlri(tptr, buf, sizeof(buf)); 1962 if (advance == -1) 1963 printf("\n\t (illegal prefix length)"); 1964 else if (advance == -2) 1965 goto trunc; 1966 else 1967 printf("\n\t %s", buf); 1968 break; 1969 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1970 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1971 advance = decode_multicast_vpn(tptr, buf, sizeof(buf)); 1972 if (advance == -1) 1973 printf("\n\t (illegal prefix length)"); 1974 else if (advance == -2) 1975 goto trunc; 1976 else 1977 printf("\n\t %s", buf); 1978 break; 1979 default: 1980 TCHECK2(*(tptr-3),tlen); 1981 printf("no AFI %u / SAFI %u decoder",af,safi); 1982 if (vflag <= 1) 1983 print_unknown_data(tptr-3,"\n\t ",tlen); 1984 advance = 0; 1985 tptr = pptr + len; 1986 break; 1987 } 1988 if (advance < 0) 1989 break; 1990 tptr += advance; 1991 } 1992 break; 1993 case BGPTYPE_EXTD_COMMUNITIES: 1994 if (len % 8) { 1995 printf("invalid len"); 1996 break; 1997 } 1998 while (tlen>0) { 1999 u_int16_t extd_comm; 2000 2001 TCHECK2(tptr[0], 2); 2002 extd_comm=EXTRACT_16BITS(tptr); 2003 2004 printf("\n\t %s (0x%04x), Flags [%s]", 2005 tok2strbuf(bgp_extd_comm_subtype_values, 2006 "unknown extd community typecode", 2007 extd_comm, tokbuf, sizeof(tokbuf)), 2008 extd_comm, 2009 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)); 2010 2011 TCHECK2(*(tptr+2), 6); 2012 switch(extd_comm) { 2013 case BGP_EXT_COM_RT_0: 2014 case BGP_EXT_COM_RO_0: 2015 case BGP_EXT_COM_L2VPN_RT_0: 2016 printf(": %u:%u (= %s)", 2017 EXTRACT_16BITS(tptr+2), 2018 EXTRACT_32BITS(tptr+4), 2019 getname(tptr+4)); 2020 break; 2021 case BGP_EXT_COM_RT_1: 2022 case BGP_EXT_COM_RO_1: 2023 case BGP_EXT_COM_L2VPN_RT_1: 2024 case BGP_EXT_COM_VRF_RT_IMP: 2025 printf(": %s:%u", 2026 getname(tptr+2), 2027 EXTRACT_16BITS(tptr+6)); 2028 break; 2029 case BGP_EXT_COM_RT_2: 2030 case BGP_EXT_COM_RO_2: 2031 printf(": %s:%u", 2032 as_printf(astostr, sizeof(astostr), 2033 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)); 2034 break; 2035 case BGP_EXT_COM_LINKBAND: 2036 bw.i = EXTRACT_32BITS(tptr+2); 2037 printf(": bandwidth: %.3f Mbps", 2038 bw.f*8/1000000); 2039 break; 2040 case BGP_EXT_COM_VPN_ORIGIN: 2041 case BGP_EXT_COM_VPN_ORIGIN2: 2042 case BGP_EXT_COM_VPN_ORIGIN3: 2043 case BGP_EXT_COM_VPN_ORIGIN4: 2044 case BGP_EXT_COM_OSPF_RID: 2045 case BGP_EXT_COM_OSPF_RID2: 2046 printf("%s", getname(tptr+2)); 2047 break; 2048 case BGP_EXT_COM_OSPF_RTYPE: 2049 case BGP_EXT_COM_OSPF_RTYPE2: 2050 printf(": area:%s, router-type:%s, metric-type:%s%s", 2051 getname(tptr+2), 2052 tok2strbuf(bgp_extd_comm_ospf_rtype_values, 2053 "unknown (0x%02x)", 2054 *(tptr+6), 2055 tokbuf, sizeof(tokbuf)), 2056 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", 2057 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""); 2058 break; 2059 case BGP_EXT_COM_L2INFO: 2060 printf(": %s Control Flags [0x%02x]:MTU %u", 2061 tok2strbuf(l2vpn_encaps_values, 2062 "unknown encaps", 2063 *(tptr+2), 2064 tokbuf, sizeof(tokbuf)), 2065 *(tptr+3), 2066 EXTRACT_16BITS(tptr+4)); 2067 break; 2068 case BGP_EXT_COM_SOURCE_AS: 2069 printf(": AS %u", EXTRACT_16BITS(tptr+2)); 2070 break; 2071 default: 2072 TCHECK2(*tptr,8); 2073 print_unknown_data(tptr,"\n\t ",8); 2074 break; 2075 } 2076 tlen -=8; 2077 tptr +=8; 2078 } 2079 break; 2080 2081 case BGPTYPE_PMSI_TUNNEL: 2082 { 2083 u_int8_t tunnel_type, flags; 2084 2085 tunnel_type = *(tptr+1); 2086 flags = *tptr; 2087 tlen = len; 2088 2089 TCHECK2(tptr[0], 5); 2090 printf("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", 2091 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), 2092 tunnel_type, 2093 bittok2str(bgp_pmsi_flag_values, "none", flags), 2094 EXTRACT_24BITS(tptr+2)>>4); 2095 2096 tptr +=5; 2097 tlen -= 5; 2098 2099 switch (tunnel_type) { 2100 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ 2101 case BGP_PMSI_TUNNEL_PIM_BIDIR: 2102 TCHECK2(tptr[0], 8); 2103 printf("\n\t Sender %s, P-Group %s", 2104 ipaddr_string(tptr), 2105 ipaddr_string(tptr+4)); 2106 break; 2107 2108 case BGP_PMSI_TUNNEL_PIM_SSM: 2109 TCHECK2(tptr[0], 8); 2110 printf("\n\t Root-Node %s, P-Group %s", 2111 ipaddr_string(tptr), 2112 ipaddr_string(tptr+4)); 2113 break; 2114 case BGP_PMSI_TUNNEL_INGRESS: 2115 TCHECK2(tptr[0], 4); 2116 printf("\n\t Tunnel-Endpoint %s", 2117 ipaddr_string(tptr)); 2118 break; 2119 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ 2120 case BGP_PMSI_TUNNEL_LDP_MP2MP: 2121 TCHECK2(tptr[0], 8); 2122 printf("\n\t Root-Node %s, LSP-ID 0x%08x", 2123 ipaddr_string(tptr), 2124 EXTRACT_32BITS(tptr+4)); 2125 break; 2126 case BGP_PMSI_TUNNEL_RSVP_P2MP: 2127 TCHECK2(tptr[0], 8); 2128 printf("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", 2129 ipaddr_string(tptr), 2130 EXTRACT_32BITS(tptr+4)); 2131 break; 2132 default: 2133 if (vflag <= 1) { 2134 print_unknown_data(tptr,"\n\t ",tlen); 2135 } 2136 } 2137 break; 2138 } 2139 case BGPTYPE_ATTR_SET: 2140 TCHECK2(tptr[0], 4); 2141 if (len < 4) 2142 goto trunc; 2143 printf("\n\t Origin AS: %s", 2144 as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(tptr))); 2145 tptr+=4; 2146 len -=4; 2147 2148 while (len) { 2149 u_int aflags, atype, alenlen, alen; 2150 2151 TCHECK2(tptr[0], 2); 2152 if (len < 2) 2153 goto trunc; 2154 aflags = *tptr; 2155 atype = *(tptr + 1); 2156 tptr += 2; 2157 len -= 2; 2158 alenlen = bgp_attr_lenlen(aflags, tptr); 2159 TCHECK2(tptr[0], alenlen); 2160 if (len < alenlen) 2161 goto trunc; 2162 alen = bgp_attr_len(aflags, tptr); 2163 tptr += alenlen; 2164 len -= alenlen; 2165 2166 printf("\n\t %s (%u), length: %u", 2167 tok2strbuf(bgp_attr_values, 2168 "Unknown Attribute", atype, 2169 tokbuf, sizeof(tokbuf)), 2170 atype, 2171 alen); 2172 2173 if (aflags) { 2174 printf(", Flags [%s%s%s%s", 2175 aflags & 0x80 ? "O" : "", 2176 aflags & 0x40 ? "T" : "", 2177 aflags & 0x20 ? "P" : "", 2178 aflags & 0x10 ? "E" : ""); 2179 if (aflags & 0xf) 2180 printf("+%x", aflags & 0xf); 2181 printf("]: "); 2182 } 2183 /* FIXME check for recursion */ 2184 if (!bgp_attr_print(atype, tptr, alen)) 2185 return 0; 2186 tptr += alen; 2187 len -= alen; 2188 } 2189 break; 2190 2191 2192 default: 2193 TCHECK2(*pptr,len); 2194 printf("\n\t no Attribute %u decoder",atype); /* we have no decoder for the attribute */ 2195 if (vflag <= 1) 2196 print_unknown_data(pptr,"\n\t ",len); 2197 break; 2198 } 2199 if (vflag > 1 && len) { /* omit zero length attributes*/ 2200 TCHECK2(*pptr,len); 2201 print_unknown_data(pptr,"\n\t ",len); 2202 } 2203 return 1; 2204 2205 trunc: 2206 return 0; 2207 } 2208 2209 static void 2210 bgp_capabilities_print(const u_char *opt, int caps_len) 2211 { 2212 char tokbuf[TOKBUFSIZE]; 2213 char tokbuf2[TOKBUFSIZE]; 2214 int cap_type, cap_len, tcap_len, cap_offset; 2215 int i = 0; 2216 2217 while (i < caps_len) { 2218 TCHECK2(opt[i], BGP_CAP_HEADER_SIZE); 2219 cap_type=opt[i]; 2220 cap_len=opt[i+1]; 2221 tcap_len=cap_len; 2222 printf("\n\t %s (%u), length: %u", 2223 tok2strbuf(bgp_capcode_values, "Unknown", 2224 cap_type, tokbuf, sizeof(tokbuf)), 2225 cap_type, 2226 cap_len); 2227 TCHECK2(opt[i+2], cap_len); 2228 switch (cap_type) { 2229 case BGP_CAPCODE_MP: 2230 printf("\n\t\tAFI %s (%u), SAFI %s (%u)", 2231 tok2strbuf(af_values, "Unknown", 2232 EXTRACT_16BITS(opt+i+2), 2233 tokbuf, sizeof(tokbuf)), 2234 EXTRACT_16BITS(opt+i+2), 2235 tok2strbuf(bgp_safi_values, "Unknown", 2236 opt[i+5], 2237 tokbuf, sizeof(tokbuf)), 2238 opt[i+5]); 2239 break; 2240 case BGP_CAPCODE_RESTART: 2241 printf("\n\t\tRestart Flags: [%s], Restart Time %us", 2242 ((opt[i+2])&0x80) ? "R" : "none", 2243 EXTRACT_16BITS(opt+i+2)&0xfff); 2244 tcap_len-=2; 2245 cap_offset=4; 2246 while(tcap_len>=4) { 2247 printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", 2248 tok2strbuf(af_values,"Unknown", 2249 EXTRACT_16BITS(opt+i+cap_offset), 2250 tokbuf, sizeof(tokbuf)), 2251 EXTRACT_16BITS(opt+i+cap_offset), 2252 tok2strbuf(bgp_safi_values,"Unknown", 2253 opt[i+cap_offset+2], 2254 tokbuf2, sizeof(tokbuf2)), 2255 opt[i+cap_offset+2], 2256 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ); 2257 tcap_len-=4; 2258 cap_offset+=4; 2259 } 2260 break; 2261 case BGP_CAPCODE_RR: 2262 case BGP_CAPCODE_RR_CISCO: 2263 break; 2264 case BGP_CAPCODE_AS_NEW: 2265 2266 /* 2267 * Extract the 4 byte AS number encoded. 2268 */ 2269 if (cap_len == 4) { 2270 printf("\n\t\t 4 Byte AS %s", 2271 as_printf(astostr, sizeof(astostr), 2272 EXTRACT_32BITS(opt + i + 2))); 2273 } 2274 break; 2275 default: 2276 printf("\n\t\tno decoder for Capability %u", 2277 cap_type); 2278 if (vflag <= 1) 2279 print_unknown_data(&opt[i+2],"\n\t\t",cap_len); 2280 break; 2281 } 2282 if (vflag > 1 && cap_len > 0) { 2283 print_unknown_data(&opt[i+2],"\n\t\t",cap_len); 2284 } 2285 i += BGP_CAP_HEADER_SIZE + cap_len; 2286 } 2287 return; 2288 2289 trunc: 2290 printf("[|BGP]"); 2291 } 2292 2293 static void 2294 bgp_open_print(const u_char *dat, int length) 2295 { 2296 struct bgp_open bgpo; 2297 struct bgp_opt bgpopt; 2298 const u_char *opt; 2299 int i; 2300 char tokbuf[TOKBUFSIZE]; 2301 2302 TCHECK2(dat[0], BGP_OPEN_SIZE); 2303 memcpy(&bgpo, dat, BGP_OPEN_SIZE); 2304 2305 printf("\n\t Version %d, ", bgpo.bgpo_version); 2306 printf("my AS %s, ", 2307 as_printf(astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))); 2308 printf("Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)); 2309 printf("ID %s", getname((u_char *)&bgpo.bgpo_id)); 2310 printf("\n\t Optional parameters, length: %u", bgpo.bgpo_optlen); 2311 2312 /* some little sanity checking */ 2313 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) 2314 return; 2315 2316 /* ugly! */ 2317 opt = &((const struct bgp_open *)dat)->bgpo_optlen; 2318 opt++; 2319 2320 i = 0; 2321 while (i < bgpo.bgpo_optlen) { 2322 TCHECK2(opt[i], BGP_OPT_SIZE); 2323 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); 2324 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { 2325 printf("\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len); 2326 break; 2327 } 2328 2329 printf("\n\t Option %s (%u), length: %u", 2330 tok2strbuf(bgp_opt_values,"Unknown", 2331 bgpopt.bgpopt_type, 2332 tokbuf, sizeof(tokbuf)), 2333 bgpopt.bgpopt_type, 2334 bgpopt.bgpopt_len); 2335 2336 /* now let's decode the options we know*/ 2337 switch(bgpopt.bgpopt_type) { 2338 2339 case BGP_OPT_CAP: 2340 bgp_capabilities_print(&opt[i+BGP_OPT_SIZE], 2341 bgpopt.bgpopt_len); 2342 break; 2343 2344 case BGP_OPT_AUTH: 2345 default: 2346 printf("\n\t no decoder for option %u", 2347 bgpopt.bgpopt_type); 2348 break; 2349 } 2350 i += BGP_OPT_SIZE + bgpopt.bgpopt_len; 2351 } 2352 return; 2353 trunc: 2354 printf("[|BGP]"); 2355 } 2356 2357 static void 2358 bgp_update_print(const u_char *dat, int length) 2359 { 2360 struct bgp bgp; 2361 const u_char *p; 2362 int withdrawn_routes_len; 2363 int len; 2364 int i; 2365 char tokbuf[TOKBUFSIZE]; 2366 #ifndef INET6 2367 char buf[MAXHOSTNAMELEN + 100]; 2368 int wpfx; 2369 #endif 2370 2371 TCHECK2(dat[0], BGP_SIZE); 2372 if (length < BGP_SIZE) 2373 goto trunc; 2374 memcpy(&bgp, dat, BGP_SIZE); 2375 p = dat + BGP_SIZE; /*XXX*/ 2376 length -= BGP_SIZE; 2377 2378 /* Unfeasible routes */ 2379 TCHECK2(p[0], 2); 2380 if (length < 2) 2381 goto trunc; 2382 withdrawn_routes_len = EXTRACT_16BITS(p); 2383 p += 2; 2384 length -= 2; 2385 if (withdrawn_routes_len) { 2386 /* 2387 * Without keeping state from the original NLRI message, 2388 * it's not possible to tell if this a v4 or v6 route, 2389 * so only try to decode it if we're not v6 enabled. 2390 */ 2391 TCHECK2(p[0], withdrawn_routes_len); 2392 if (length < withdrawn_routes_len) 2393 goto trunc; 2394 #ifdef INET6 2395 printf("\n\t Withdrawn routes: %d bytes", withdrawn_routes_len); 2396 p += withdrawn_routes_len; 2397 length -= withdrawn_routes_len; 2398 #else 2399 if (withdrawn_routes_len < 2) 2400 goto trunc; 2401 length -= 2; 2402 withdrawn_routes_len -= 2; 2403 2404 2405 printf("\n\t Withdrawn routes:"); 2406 2407 while(withdrawn_routes_len > 0) { 2408 wpfx = decode_prefix4(p, withdrawn_routes_len, buf, sizeof(buf)); 2409 if (wpfx == -1) { 2410 printf("\n\t (illegal prefix length)"); 2411 break; 2412 } else if (wpfx == -2) 2413 goto trunc; 2414 else if (wpfx == -3) 2415 goto trunc; /* bytes left, but not enough */ 2416 else { 2417 printf("\n\t %s", buf); 2418 p += wpfx; 2419 length -= wpfx; 2420 withdrawn_routes_len -= wpfx; 2421 } 2422 } 2423 #endif 2424 } 2425 2426 TCHECK2(p[0], 2); 2427 if (length < 2) 2428 goto trunc; 2429 len = EXTRACT_16BITS(p); 2430 p += 2; 2431 length -= 2; 2432 2433 if (withdrawn_routes_len == 0 && len == 0 && length == 0) { 2434 /* No withdrawn routes, no path attributes, no NLRI */ 2435 printf("\n\t End-of-Rib Marker (empty NLRI)"); 2436 return; 2437 } 2438 2439 if (len) { 2440 /* do something more useful!*/ 2441 while (len) { 2442 int aflags, atype, alenlen, alen; 2443 2444 TCHECK2(p[0], 2); 2445 if (len < 2) 2446 goto trunc; 2447 if (length < 2) 2448 goto trunc; 2449 aflags = *p; 2450 atype = *(p + 1); 2451 p += 2; 2452 len -= 2; 2453 length -= 2; 2454 alenlen = bgp_attr_lenlen(aflags, p); 2455 TCHECK2(p[0], alenlen); 2456 if (len < alenlen) 2457 goto trunc; 2458 if (length < alenlen) 2459 goto trunc; 2460 alen = bgp_attr_len(aflags, p); 2461 p += alenlen; 2462 len -= alenlen; 2463 length -= alenlen; 2464 2465 printf("\n\t %s (%u), length: %u", 2466 tok2strbuf(bgp_attr_values, "Unknown Attribute", 2467 atype, 2468 tokbuf, sizeof(tokbuf)), 2469 atype, 2470 alen); 2471 2472 if (aflags) { 2473 printf(", Flags [%s%s%s%s", 2474 aflags & 0x80 ? "O" : "", 2475 aflags & 0x40 ? "T" : "", 2476 aflags & 0x20 ? "P" : "", 2477 aflags & 0x10 ? "E" : ""); 2478 if (aflags & 0xf) 2479 printf("+%x", aflags & 0xf); 2480 printf("]: "); 2481 } 2482 if (len < alen) 2483 goto trunc; 2484 if (length < alen) 2485 goto trunc; 2486 if (!bgp_attr_print(atype, p, alen)) 2487 goto trunc; 2488 p += alen; 2489 len -= alen; 2490 length -= alen; 2491 } 2492 } 2493 2494 if (length) { 2495 /* 2496 * XXX - what if they're using the "Advertisement of 2497 * Multiple Paths in BGP" feature: 2498 * 2499 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/ 2500 * 2501 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06 2502 */ 2503 printf("\n\t Updated routes:"); 2504 while (length) { 2505 char buf[MAXHOSTNAMELEN + 100]; 2506 i = decode_prefix4(p, length, buf, sizeof(buf)); 2507 if (i == -1) { 2508 printf("\n\t (illegal prefix length)"); 2509 break; 2510 } else if (i == -2) 2511 goto trunc; 2512 else if (i == -3) 2513 goto trunc; /* bytes left, but not enough */ 2514 else { 2515 printf("\n\t %s", buf); 2516 p += i; 2517 length -= i; 2518 } 2519 } 2520 } 2521 return; 2522 trunc: 2523 printf("[|BGP]"); 2524 } 2525 2526 static void 2527 bgp_notification_print(const u_char *dat, int length) 2528 { 2529 struct bgp_notification bgpn; 2530 const u_char *tptr; 2531 char tokbuf[TOKBUFSIZE]; 2532 char tokbuf2[TOKBUFSIZE]; 2533 2534 TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); 2535 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); 2536 2537 /* some little sanity checking */ 2538 if (length<BGP_NOTIFICATION_SIZE) 2539 return; 2540 2541 printf(", %s (%u)", 2542 tok2strbuf(bgp_notify_major_values, "Unknown Error", 2543 bgpn.bgpn_major, tokbuf, sizeof(tokbuf)), 2544 bgpn.bgpn_major); 2545 2546 switch (bgpn.bgpn_major) { 2547 2548 case BGP_NOTIFY_MAJOR_MSG: 2549 printf(", subcode %s (%u)", 2550 tok2strbuf(bgp_notify_minor_msg_values, "Unknown", 2551 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2552 bgpn.bgpn_minor); 2553 break; 2554 case BGP_NOTIFY_MAJOR_OPEN: 2555 printf(", subcode %s (%u)", 2556 tok2strbuf(bgp_notify_minor_open_values, "Unknown", 2557 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2558 bgpn.bgpn_minor); 2559 break; 2560 case BGP_NOTIFY_MAJOR_UPDATE: 2561 printf(", subcode %s (%u)", 2562 tok2strbuf(bgp_notify_minor_update_values, "Unknown", 2563 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2564 bgpn.bgpn_minor); 2565 break; 2566 case BGP_NOTIFY_MAJOR_CAP: 2567 printf(" subcode %s (%u)", 2568 tok2strbuf(bgp_notify_minor_cap_values, "Unknown", 2569 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2570 bgpn.bgpn_minor); 2571 case BGP_NOTIFY_MAJOR_CEASE: 2572 printf(", subcode %s (%u)", 2573 tok2strbuf(bgp_notify_minor_cease_values, "Unknown", 2574 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2575 bgpn.bgpn_minor); 2576 2577 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes 2578 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES 2579 */ 2580 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { 2581 tptr = dat + BGP_NOTIFICATION_SIZE; 2582 TCHECK2(*tptr, 7); 2583 printf(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", 2584 tok2strbuf(af_values, "Unknown", 2585 EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)), 2586 EXTRACT_16BITS(tptr), 2587 tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2), 2588 tokbuf2, sizeof(tokbuf)), 2589 *(tptr+2), 2590 EXTRACT_32BITS(tptr+3)); 2591 } 2592 break; 2593 default: 2594 break; 2595 } 2596 2597 return; 2598 trunc: 2599 printf("[|BGP]"); 2600 } 2601 2602 static void 2603 bgp_route_refresh_print(const u_char *pptr, int len) { 2604 2605 const struct bgp_route_refresh *bgp_route_refresh_header; 2606 char tokbuf[TOKBUFSIZE]; 2607 char tokbuf2[TOKBUFSIZE]; 2608 2609 TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE); 2610 2611 /* some little sanity checking */ 2612 if (len<BGP_ROUTE_REFRESH_SIZE) 2613 return; 2614 2615 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; 2616 2617 printf("\n\t AFI %s (%u), SAFI %s (%u)", 2618 tok2strbuf(af_values,"Unknown", 2619 /* this stinks but the compiler pads the structure 2620 * weird */ 2621 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2622 tokbuf, sizeof(tokbuf)), 2623 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2624 tok2strbuf(bgp_safi_values,"Unknown", 2625 bgp_route_refresh_header->safi, 2626 tokbuf2, sizeof(tokbuf2)), 2627 bgp_route_refresh_header->safi); 2628 2629 if (vflag > 1) { 2630 TCHECK2(*pptr, len); 2631 print_unknown_data(pptr,"\n\t ", len); 2632 } 2633 2634 return; 2635 trunc: 2636 printf("[|BGP]"); 2637 } 2638 2639 static int 2640 bgp_header_print(const u_char *dat, int length) 2641 { 2642 struct bgp bgp; 2643 char tokbuf[TOKBUFSIZE]; 2644 2645 TCHECK2(dat[0], BGP_SIZE); 2646 memcpy(&bgp, dat, BGP_SIZE); 2647 printf("\n\t%s Message (%u), length: %u", 2648 tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type, 2649 tokbuf, sizeof(tokbuf)), 2650 bgp.bgp_type, 2651 length); 2652 2653 switch (bgp.bgp_type) { 2654 case BGP_OPEN: 2655 bgp_open_print(dat, length); 2656 break; 2657 case BGP_UPDATE: 2658 bgp_update_print(dat, length); 2659 break; 2660 case BGP_NOTIFICATION: 2661 bgp_notification_print(dat, length); 2662 break; 2663 case BGP_KEEPALIVE: 2664 break; 2665 case BGP_ROUTE_REFRESH: 2666 bgp_route_refresh_print(dat, length); 2667 break; 2668 default: 2669 /* we have no decoder for the BGP message */ 2670 TCHECK2(*dat, length); 2671 printf("\n\t no Message %u decoder",bgp.bgp_type); 2672 print_unknown_data(dat,"\n\t ",length); 2673 break; 2674 } 2675 return 1; 2676 trunc: 2677 printf("[|BGP]"); 2678 return 0; 2679 } 2680 2681 void 2682 bgp_print(const u_char *dat, int length) 2683 { 2684 const u_char *p; 2685 const u_char *ep; 2686 const u_char *start; 2687 const u_char marker[] = { 2688 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2689 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2690 }; 2691 struct bgp bgp; 2692 u_int16_t hlen; 2693 char tokbuf[TOKBUFSIZE]; 2694 2695 ep = dat + length; 2696 if (snapend < dat + length) 2697 ep = snapend; 2698 2699 printf(": BGP, length: %u",length); 2700 2701 if (vflag < 1) /* lets be less chatty */ 2702 return; 2703 2704 p = dat; 2705 start = p; 2706 while (p < ep) { 2707 if (!TTEST2(p[0], 1)) 2708 break; 2709 if (p[0] != 0xff) { 2710 p++; 2711 continue; 2712 } 2713 2714 if (!TTEST2(p[0], sizeof(marker))) 2715 break; 2716 if (memcmp(p, marker, sizeof(marker)) != 0) { 2717 p++; 2718 continue; 2719 } 2720 2721 /* found BGP header */ 2722 TCHECK2(p[0], BGP_SIZE); /*XXX*/ 2723 memcpy(&bgp, p, BGP_SIZE); 2724 2725 if (start != p) 2726 printf(" [|BGP]"); 2727 2728 hlen = ntohs(bgp.bgp_len); 2729 if (hlen < BGP_SIZE) { 2730 printf("\n[|BGP Bogus header length %u < %u]", hlen, 2731 BGP_SIZE); 2732 break; 2733 } 2734 2735 if (TTEST2(p[0], hlen)) { 2736 if (!bgp_header_print(p, hlen)) 2737 return; 2738 p += hlen; 2739 start = p; 2740 } else { 2741 printf("\n[|BGP %s]", 2742 tok2strbuf(bgp_msg_values, 2743 "Unknown Message Type", 2744 bgp.bgp_type, 2745 tokbuf, sizeof(tokbuf))); 2746 break; 2747 } 2748 } 2749 2750 return; 2751 2752 trunc: 2753 printf(" [|BGP]"); 2754 } 2755 2756 /* 2757 * Local Variables: 2758 * c-style: whitesmith 2759 * c-basic-offset: 4 2760 * End: 2761 */ 2762
