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@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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 struct tok bgp_extd_comm_flag_values[] = { 409 { 0x8000, "vendor-specific"}, 410 { 0x4000, "non-transitive"}, 411 { 0, NULL}, 412 }; 413 414 static 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 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 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 printf("\n\t nexthop: "); 1535 while (tlen > 0) { 1536 switch(af<<8 | safi) { 1537 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1538 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1539 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1540 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1541 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1542 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1543 case (AFNUM_INET<<8 | SAFNUM_MDT): 1544 if (tlen < (int)sizeof(struct in_addr)) { 1545 printf("invalid len"); 1546 tlen = 0; 1547 } else { 1548 TCHECK2(tptr[0], sizeof(struct in_addr)); 1549 printf("%s",getname(tptr)); 1550 tlen -= sizeof(struct in_addr); 1551 tptr += sizeof(struct in_addr); 1552 } 1553 break; 1554 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1555 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1556 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1557 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { 1558 printf("invalid len"); 1559 tlen = 0; 1560 } else { 1561 TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1562 printf("RD: %s, %s", 1563 bgp_vpn_rd_print(tptr), 1564 getname(tptr+BGP_VPN_RD_LEN)); 1565 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1566 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1567 } 1568 break; 1569 #ifdef INET6 1570 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1571 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1572 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1573 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1574 if (tlen < (int)sizeof(struct in6_addr)) { 1575 printf("invalid len"); 1576 tlen = 0; 1577 } else { 1578 TCHECK2(tptr[0], sizeof(struct in6_addr)); 1579 printf("%s", getname6(tptr)); 1580 tlen -= sizeof(struct in6_addr); 1581 tptr += sizeof(struct in6_addr); 1582 } 1583 break; 1584 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1585 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1586 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1587 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { 1588 printf("invalid len"); 1589 tlen = 0; 1590 } else { 1591 TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1592 printf("RD: %s, %s", 1593 bgp_vpn_rd_print(tptr), 1594 getname6(tptr+BGP_VPN_RD_LEN)); 1595 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1596 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1597 } 1598 break; 1599 #endif 1600 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1601 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1602 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1603 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1604 if (tlen < (int)sizeof(struct in_addr)) { 1605 printf("invalid len"); 1606 tlen = 0; 1607 } else { 1608 TCHECK2(tptr[0], sizeof(struct in_addr)); 1609 printf("%s", getname(tptr)); 1610 tlen -= (sizeof(struct in_addr)); 1611 tptr += (sizeof(struct in_addr)); 1612 } 1613 break; 1614 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1615 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1616 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1617 TCHECK2(tptr[0], tlen); 1618 printf("%s",isonsap_string(tptr,tlen)); 1619 tptr += tlen; 1620 tlen = 0; 1621 break; 1622 1623 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1624 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1625 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1626 if (tlen < BGP_VPN_RD_LEN+1) { 1627 printf("invalid len"); 1628 tlen = 0; 1629 } else { 1630 TCHECK2(tptr[0], tlen); 1631 printf("RD: %s, %s", 1632 bgp_vpn_rd_print(tptr), 1633 isonsap_string(tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)); 1634 /* rfc986 mapped IPv4 address ? */ 1635 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601) 1636 printf(" = %s", getname(tptr+BGP_VPN_RD_LEN+4)); 1637 #ifdef INET6 1638 /* rfc1888 mapped IPv6 address ? */ 1639 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000) 1640 printf(" = %s", getname6(tptr+BGP_VPN_RD_LEN+3)); 1641 #endif 1642 tptr += tlen; 1643 tlen = 0; 1644 } 1645 break; 1646 default: 1647 TCHECK2(tptr[0], tlen); 1648 printf("no AFI %u/SAFI %u decoder",af,safi); 1649 if (vflag <= 1) 1650 print_unknown_data(tptr,"\n\t ",tlen); 1651 tptr += tlen; 1652 tlen = 0; 1653 goto done; 1654 break; 1655 } 1656 } 1657 } 1658 printf(", nh-length: %u", nhlen); 1659 tptr += tlen; 1660 1661 TCHECK(tptr[0]); 1662 snpa = tptr[0]; 1663 tptr++; 1664 1665 if (snpa) { 1666 printf("\n\t %u SNPA", snpa); 1667 for (/*nothing*/; snpa > 0; snpa--) { 1668 TCHECK(tptr[0]); 1669 printf("\n\t %d bytes", tptr[0]); 1670 tptr += tptr[0] + 1; 1671 } 1672 } else { 1673 printf(", no SNPA"); 1674 } 1675 1676 while (len - (tptr - pptr) > 0) { 1677 switch (af<<8 | safi) { 1678 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1679 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1680 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1681 advance = decode_prefix4(tptr, len, buf, sizeof(buf)); 1682 if (advance == -1) 1683 printf("\n\t (illegal prefix length)"); 1684 else if (advance == -2) 1685 goto trunc; 1686 else if (advance == -3) 1687 break; /* bytes left, but not enough */ 1688 else 1689 printf("\n\t %s", buf); 1690 break; 1691 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1692 advance = decode_labeled_prefix4(tptr, len, buf, sizeof(buf)); 1693 if (advance == -1) 1694 printf("\n\t (illegal prefix length)"); 1695 else if (advance == -2) 1696 goto trunc; 1697 else if (advance == -3) 1698 break; /* bytes left, but not enough */ 1699 else 1700 printf("\n\t %s", buf); 1701 break; 1702 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1703 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1704 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1705 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf)); 1706 if (advance == -1) 1707 printf("\n\t (illegal prefix length)"); 1708 else if (advance == -2) 1709 goto trunc; 1710 else 1711 printf("\n\t %s", buf); 1712 break; 1713 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1714 advance = decode_rt_routing_info(tptr, buf, sizeof(buf)); 1715 if (advance == -1) 1716 printf("\n\t (illegal prefix length)"); 1717 else if (advance == -2) 1718 goto trunc; 1719 else 1720 printf("\n\t %s", buf); 1721 break; 1722 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1723 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1724 advance = decode_multicast_vpn(tptr, buf, sizeof(buf)); 1725 if (advance == -1) 1726 printf("\n\t (illegal prefix length)"); 1727 else if (advance == -2) 1728 goto trunc; 1729 else 1730 printf("\n\t %s", buf); 1731 break; 1732 1733 case (AFNUM_INET<<8 | SAFNUM_MDT): 1734 advance = decode_mdt_vpn_nlri(tptr, buf, sizeof(buf)); 1735 if (advance == -1) 1736 printf("\n\t (illegal prefix length)"); 1737 else if (advance == -2) 1738 goto trunc; 1739 else 1740 printf("\n\t %s", buf); 1741 break; 1742 #ifdef INET6 1743 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1744 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1745 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1746 advance = decode_prefix6(tptr, len, buf, sizeof(buf)); 1747 if (advance == -1) 1748 printf("\n\t (illegal prefix length)"); 1749 else if (advance == -2) 1750 goto trunc; 1751 else if (advance == -3) 1752 break; /* bytes left, but not enough */ 1753 else 1754 printf("\n\t %s", buf); 1755 break; 1756 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1757 advance = decode_labeled_prefix6(tptr, len, buf, sizeof(buf)); 1758 if (advance == -1) 1759 printf("\n\t (illegal prefix length)"); 1760 else if (advance == -2) 1761 goto trunc; 1762 else if (advance == -3) 1763 break; /* bytes left, but not enough */ 1764 else 1765 printf("\n\t %s", buf); 1766 break; 1767 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1768 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1769 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1770 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf)); 1771 if (advance == -1) 1772 printf("\n\t (illegal prefix length)"); 1773 else if (advance == -2) 1774 goto trunc; 1775 else 1776 printf("\n\t %s", buf); 1777 break; 1778 #endif 1779 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1780 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1781 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1782 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1783 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf)); 1784 if (advance == -1) 1785 printf("\n\t (illegal length)"); 1786 else if (advance == -2) 1787 goto trunc; 1788 else 1789 printf("\n\t %s", buf); 1790 break; 1791 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1792 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1793 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1794 advance = decode_clnp_prefix(tptr, buf, sizeof(buf)); 1795 if (advance == -1) 1796 printf("\n\t (illegal prefix length)"); 1797 else if (advance == -2) 1798 goto trunc; 1799 else 1800 printf("\n\t %s", buf); 1801 break; 1802 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1803 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1804 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1805 advance = decode_labeled_vpn_clnp_prefix(tptr, buf, sizeof(buf)); 1806 if (advance == -1) 1807 printf("\n\t (illegal prefix length)"); 1808 else if (advance == -2) 1809 goto trunc; 1810 else 1811 printf("\n\t %s", buf); 1812 break; 1813 default: 1814 TCHECK2(*tptr,tlen); 1815 printf("\n\t no AFI %u / SAFI %u decoder",af,safi); 1816 if (vflag <= 1) 1817 print_unknown_data(tptr,"\n\t ",tlen); 1818 advance = 0; 1819 tptr = pptr + len; 1820 break; 1821 } 1822 if (advance < 0) 1823 break; 1824 tptr += advance; 1825 } 1826 done: 1827 break; 1828 1829 case BGPTYPE_MP_UNREACH_NLRI: 1830 TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE); 1831 af = EXTRACT_16BITS(tptr); 1832 safi = tptr[2]; 1833 1834 printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1835 tok2strbuf(af_values, "Unknown AFI", af, 1836 tokbuf, sizeof(tokbuf)), 1837 af, 1838 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1839 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi, 1840 tokbuf, sizeof(tokbuf)), 1841 safi); 1842 1843 if (len == BGP_MP_NLRI_MINSIZE) 1844 printf("\n\t End-of-Rib Marker (empty NLRI)"); 1845 1846 tptr += 3; 1847 1848 while (len - (tptr - pptr) > 0) { 1849 switch (af<<8 | safi) { 1850 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1851 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1852 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1853 advance = decode_prefix4(tptr, len, buf, sizeof(buf)); 1854 if (advance == -1) 1855 printf("\n\t (illegal prefix length)"); 1856 else if (advance == -2) 1857 goto trunc; 1858 else if (advance == -3) 1859 break; /* bytes left, but not enough */ 1860 else 1861 printf("\n\t %s", buf); 1862 break; 1863 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1864 advance = decode_labeled_prefix4(tptr, len, buf, sizeof(buf)); 1865 if (advance == -1) 1866 printf("\n\t (illegal prefix length)"); 1867 else if (advance == -2) 1868 goto trunc; 1869 else if (advance == -3) 1870 break; /* bytes left, but not enough */ 1871 else 1872 printf("\n\t %s", buf); 1873 break; 1874 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1875 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1876 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1877 advance = decode_labeled_vpn_prefix4(tptr, buf, sizeof(buf)); 1878 if (advance == -1) 1879 printf("\n\t (illegal prefix length)"); 1880 else if (advance == -2) 1881 goto trunc; 1882 else 1883 printf("\n\t %s", buf); 1884 break; 1885 #ifdef INET6 1886 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1887 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1888 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1889 advance = decode_prefix6(tptr, len, buf, sizeof(buf)); 1890 if (advance == -1) 1891 printf("\n\t (illegal prefix length)"); 1892 else if (advance == -2) 1893 goto trunc; 1894 else if (advance == -3) 1895 break; /* bytes left, but not enough */ 1896 else 1897 printf("\n\t %s", buf); 1898 break; 1899 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1900 advance = decode_labeled_prefix6(tptr, len, buf, sizeof(buf)); 1901 if (advance == -1) 1902 printf("\n\t (illegal prefix length)"); 1903 else if (advance == -2) 1904 goto trunc; 1905 else if (advance == -3) 1906 break; /* bytes left, but not enough */ 1907 else 1908 printf("\n\t %s", buf); 1909 break; 1910 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1911 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1912 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1913 advance = decode_labeled_vpn_prefix6(tptr, buf, sizeof(buf)); 1914 if (advance == -1) 1915 printf("\n\t (illegal prefix length)"); 1916 else if (advance == -2) 1917 goto trunc; 1918 else 1919 printf("\n\t %s", buf); 1920 break; 1921 #endif 1922 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1923 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1924 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1925 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1926 advance = decode_labeled_vpn_l2(tptr, buf, sizeof(buf)); 1927 if (advance == -1) 1928 printf("\n\t (illegal length)"); 1929 else if (advance == -2) 1930 goto trunc; 1931 else 1932 printf("\n\t %s", buf); 1933 break; 1934 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1935 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1936 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1937 advance = decode_clnp_prefix(tptr, buf, sizeof(buf)); 1938 if (advance == -1) 1939 printf("\n\t (illegal prefix length)"); 1940 else if (advance == -2) 1941 goto trunc; 1942 else 1943 printf("\n\t %s", buf); 1944 break; 1945 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1946 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1947 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1948 advance = decode_labeled_vpn_clnp_prefix(tptr, buf, sizeof(buf)); 1949 if (advance == -1) 1950 printf("\n\t (illegal prefix length)"); 1951 else if (advance == -2) 1952 goto trunc; 1953 else 1954 printf("\n\t %s", buf); 1955 break; 1956 case (AFNUM_INET<<8 | SAFNUM_MDT): 1957 advance = decode_mdt_vpn_nlri(tptr, buf, sizeof(buf)); 1958 if (advance == -1) 1959 printf("\n\t (illegal prefix length)"); 1960 else if (advance == -2) 1961 goto trunc; 1962 else 1963 printf("\n\t %s", buf); 1964 break; 1965 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1966 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1967 advance = decode_multicast_vpn(tptr, buf, sizeof(buf)); 1968 if (advance == -1) 1969 printf("\n\t (illegal prefix length)"); 1970 else if (advance == -2) 1971 goto trunc; 1972 else 1973 printf("\n\t %s", buf); 1974 break; 1975 default: 1976 TCHECK2(*(tptr-3),tlen); 1977 printf("no AFI %u / SAFI %u decoder",af,safi); 1978 if (vflag <= 1) 1979 print_unknown_data(tptr-3,"\n\t ",tlen); 1980 advance = 0; 1981 tptr = pptr + len; 1982 break; 1983 } 1984 if (advance < 0) 1985 break; 1986 tptr += advance; 1987 } 1988 break; 1989 case BGPTYPE_EXTD_COMMUNITIES: 1990 if (len % 8) { 1991 printf("invalid len"); 1992 break; 1993 } 1994 while (tlen>0) { 1995 u_int16_t extd_comm; 1996 1997 TCHECK2(tptr[0], 2); 1998 extd_comm=EXTRACT_16BITS(tptr); 1999 2000 printf("\n\t %s (0x%04x), Flags [%s]", 2001 tok2strbuf(bgp_extd_comm_subtype_values, 2002 "unknown extd community typecode", 2003 extd_comm, tokbuf, sizeof(tokbuf)), 2004 extd_comm, 2005 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)); 2006 2007 TCHECK2(*(tptr+2), 6); 2008 switch(extd_comm) { 2009 case BGP_EXT_COM_RT_0: 2010 case BGP_EXT_COM_RO_0: 2011 case BGP_EXT_COM_L2VPN_RT_0: 2012 printf(": %u:%u (= %s)", 2013 EXTRACT_16BITS(tptr+2), 2014 EXTRACT_32BITS(tptr+4), 2015 getname(tptr+4)); 2016 break; 2017 case BGP_EXT_COM_RT_1: 2018 case BGP_EXT_COM_RO_1: 2019 case BGP_EXT_COM_L2VPN_RT_1: 2020 case BGP_EXT_COM_VRF_RT_IMP: 2021 printf(": %s:%u", 2022 getname(tptr+2), 2023 EXTRACT_16BITS(tptr+6)); 2024 break; 2025 case BGP_EXT_COM_RT_2: 2026 case BGP_EXT_COM_RO_2: 2027 printf(": %s:%u", 2028 as_printf(astostr, sizeof(astostr), 2029 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)); 2030 break; 2031 case BGP_EXT_COM_LINKBAND: 2032 bw.i = EXTRACT_32BITS(tptr+2); 2033 printf(": bandwidth: %.3f Mbps", 2034 bw.f*8/1000000); 2035 break; 2036 case BGP_EXT_COM_VPN_ORIGIN: 2037 case BGP_EXT_COM_VPN_ORIGIN2: 2038 case BGP_EXT_COM_VPN_ORIGIN3: 2039 case BGP_EXT_COM_VPN_ORIGIN4: 2040 case BGP_EXT_COM_OSPF_RID: 2041 case BGP_EXT_COM_OSPF_RID2: 2042 printf("%s", getname(tptr+2)); 2043 break; 2044 case BGP_EXT_COM_OSPF_RTYPE: 2045 case BGP_EXT_COM_OSPF_RTYPE2: 2046 printf(": area:%s, router-type:%s, metric-type:%s%s", 2047 getname(tptr+2), 2048 tok2strbuf(bgp_extd_comm_ospf_rtype_values, 2049 "unknown (0x%02x)", 2050 *(tptr+6), 2051 tokbuf, sizeof(tokbuf)), 2052 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", 2053 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""); 2054 break; 2055 case BGP_EXT_COM_L2INFO: 2056 printf(": %s Control Flags [0x%02x]:MTU %u", 2057 tok2strbuf(l2vpn_encaps_values, 2058 "unknown encaps", 2059 *(tptr+2), 2060 tokbuf, sizeof(tokbuf)), 2061 *(tptr+3), 2062 EXTRACT_16BITS(tptr+4)); 2063 break; 2064 case BGP_EXT_COM_SOURCE_AS: 2065 printf(": AS %u", EXTRACT_16BITS(tptr+2)); 2066 break; 2067 default: 2068 TCHECK2(*tptr,8); 2069 print_unknown_data(tptr,"\n\t ",8); 2070 break; 2071 } 2072 tlen -=8; 2073 tptr +=8; 2074 } 2075 break; 2076 2077 case BGPTYPE_PMSI_TUNNEL: 2078 { 2079 u_int8_t tunnel_type, flags; 2080 2081 tunnel_type = *(tptr+1); 2082 flags = *tptr; 2083 tlen = len; 2084 2085 TCHECK2(tptr[0], 5); 2086 printf("\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", 2087 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), 2088 tunnel_type, 2089 bittok2str(bgp_pmsi_flag_values, "none", flags), 2090 EXTRACT_24BITS(tptr+2)>>4); 2091 2092 tptr +=5; 2093 tlen -= 5; 2094 2095 switch (tunnel_type) { 2096 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ 2097 case BGP_PMSI_TUNNEL_PIM_BIDIR: 2098 TCHECK2(tptr[0], 8); 2099 printf("\n\t Sender %s, P-Group %s", 2100 ipaddr_string(tptr), 2101 ipaddr_string(tptr+4)); 2102 break; 2103 2104 case BGP_PMSI_TUNNEL_PIM_SSM: 2105 TCHECK2(tptr[0], 8); 2106 printf("\n\t Root-Node %s, P-Group %s", 2107 ipaddr_string(tptr), 2108 ipaddr_string(tptr+4)); 2109 break; 2110 case BGP_PMSI_TUNNEL_INGRESS: 2111 TCHECK2(tptr[0], 4); 2112 printf("\n\t Tunnel-Endpoint %s", 2113 ipaddr_string(tptr)); 2114 break; 2115 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ 2116 case BGP_PMSI_TUNNEL_LDP_MP2MP: 2117 TCHECK2(tptr[0], 8); 2118 printf("\n\t Root-Node %s, LSP-ID 0x%08x", 2119 ipaddr_string(tptr), 2120 EXTRACT_32BITS(tptr+4)); 2121 break; 2122 case BGP_PMSI_TUNNEL_RSVP_P2MP: 2123 TCHECK2(tptr[0], 8); 2124 printf("\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", 2125 ipaddr_string(tptr), 2126 EXTRACT_32BITS(tptr+4)); 2127 break; 2128 default: 2129 if (vflag <= 1) { 2130 print_unknown_data(tptr,"\n\t ",tlen); 2131 } 2132 } 2133 break; 2134 } 2135 case BGPTYPE_ATTR_SET: 2136 TCHECK2(tptr[0], 4); 2137 if (len < 4) 2138 goto trunc; 2139 printf("\n\t Origin AS: %s", 2140 as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(tptr))); 2141 tptr+=4; 2142 len -=4; 2143 2144 while (len) { 2145 u_int aflags, atype, alenlen, alen; 2146 2147 TCHECK2(tptr[0], 2); 2148 if (len < 2) 2149 goto trunc; 2150 aflags = *tptr; 2151 atype = *(tptr + 1); 2152 tptr += 2; 2153 len -= 2; 2154 alenlen = bgp_attr_lenlen(aflags, tptr); 2155 TCHECK2(tptr[0], alenlen); 2156 if (len < alenlen) 2157 goto trunc; 2158 alen = bgp_attr_len(aflags, tptr); 2159 tptr += alenlen; 2160 len -= alenlen; 2161 2162 printf("\n\t %s (%u), length: %u", 2163 tok2strbuf(bgp_attr_values, 2164 "Unknown Attribute", atype, 2165 tokbuf, sizeof(tokbuf)), 2166 atype, 2167 alen); 2168 2169 if (aflags) { 2170 printf(", Flags [%s%s%s%s", 2171 aflags & 0x80 ? "O" : "", 2172 aflags & 0x40 ? "T" : "", 2173 aflags & 0x20 ? "P" : "", 2174 aflags & 0x10 ? "E" : ""); 2175 if (aflags & 0xf) 2176 printf("+%x", aflags & 0xf); 2177 printf("]: "); 2178 } 2179 /* FIXME check for recursion */ 2180 if (!bgp_attr_print(atype, tptr, alen)) 2181 return 0; 2182 tptr += alen; 2183 len -= alen; 2184 } 2185 break; 2186 2187 2188 default: 2189 TCHECK2(*pptr,len); 2190 printf("\n\t no Attribute %u decoder",atype); /* we have no decoder for the attribute */ 2191 if (vflag <= 1) 2192 print_unknown_data(pptr,"\n\t ",len); 2193 break; 2194 } 2195 if (vflag > 1 && len) { /* omit zero length attributes*/ 2196 TCHECK2(*pptr,len); 2197 print_unknown_data(pptr,"\n\t ",len); 2198 } 2199 return 1; 2200 2201 trunc: 2202 return 0; 2203 } 2204 2205 static void 2206 bgp_capabilities_print(const u_char *opt, int caps_len) 2207 { 2208 char tokbuf[TOKBUFSIZE]; 2209 char tokbuf2[TOKBUFSIZE]; 2210 int cap_type, cap_len, tcap_len, cap_offset; 2211 int i = 0; 2212 2213 while (i < caps_len) { 2214 TCHECK2(opt[i], BGP_CAP_HEADER_SIZE); 2215 cap_type=opt[i]; 2216 cap_len=opt[i+1]; 2217 tcap_len=cap_len; 2218 printf("\n\t %s (%u), length: %u", 2219 tok2strbuf(bgp_capcode_values, "Unknown", 2220 cap_type, tokbuf, sizeof(tokbuf)), 2221 cap_type, 2222 cap_len); 2223 TCHECK2(opt[i+2], cap_len); 2224 switch (cap_type) { 2225 case BGP_CAPCODE_MP: 2226 printf("\n\t\tAFI %s (%u), SAFI %s (%u)", 2227 tok2strbuf(af_values, "Unknown", 2228 EXTRACT_16BITS(opt+i+2), 2229 tokbuf, sizeof(tokbuf)), 2230 EXTRACT_16BITS(opt+i+2), 2231 tok2strbuf(bgp_safi_values, "Unknown", 2232 opt[i+5], 2233 tokbuf, sizeof(tokbuf)), 2234 opt[i+5]); 2235 break; 2236 case BGP_CAPCODE_RESTART: 2237 printf("\n\t\tRestart Flags: [%s], Restart Time %us", 2238 ((opt[i+2])&0x80) ? "R" : "none", 2239 EXTRACT_16BITS(opt+i+2)&0xfff); 2240 tcap_len-=2; 2241 cap_offset=4; 2242 while(tcap_len>=4) { 2243 printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", 2244 tok2strbuf(af_values,"Unknown", 2245 EXTRACT_16BITS(opt+i+cap_offset), 2246 tokbuf, sizeof(tokbuf)), 2247 EXTRACT_16BITS(opt+i+cap_offset), 2248 tok2strbuf(bgp_safi_values,"Unknown", 2249 opt[i+cap_offset+2], 2250 tokbuf2, sizeof(tokbuf2)), 2251 opt[i+cap_offset+2], 2252 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ); 2253 tcap_len-=4; 2254 cap_offset+=4; 2255 } 2256 break; 2257 case BGP_CAPCODE_RR: 2258 case BGP_CAPCODE_RR_CISCO: 2259 break; 2260 case BGP_CAPCODE_AS_NEW: 2261 2262 /* 2263 * Extract the 4 byte AS number encoded. 2264 */ 2265 if (cap_len == 4) { 2266 printf("\n\t\t 4 Byte AS %s", 2267 as_printf(astostr, sizeof(astostr), 2268 EXTRACT_32BITS(opt + i + 2))); 2269 } 2270 break; 2271 default: 2272 printf("\n\t\tno decoder for Capability %u", 2273 cap_type); 2274 if (vflag <= 1) 2275 print_unknown_data(&opt[i+2],"\n\t\t",cap_len); 2276 break; 2277 } 2278 if (vflag > 1 && cap_len > 0) { 2279 print_unknown_data(&opt[i+2],"\n\t\t",cap_len); 2280 } 2281 i += BGP_CAP_HEADER_SIZE + cap_len; 2282 } 2283 return; 2284 2285 trunc: 2286 printf("[|BGP]"); 2287 } 2288 2289 static void 2290 bgp_open_print(const u_char *dat, int length) 2291 { 2292 struct bgp_open bgpo; 2293 struct bgp_opt bgpopt; 2294 const u_char *opt; 2295 int i; 2296 char tokbuf[TOKBUFSIZE]; 2297 2298 TCHECK2(dat[0], BGP_OPEN_SIZE); 2299 memcpy(&bgpo, dat, BGP_OPEN_SIZE); 2300 2301 printf("\n\t Version %d, ", bgpo.bgpo_version); 2302 printf("my AS %s, ", 2303 as_printf(astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))); 2304 printf("Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)); 2305 printf("ID %s", getname((u_char *)&bgpo.bgpo_id)); 2306 printf("\n\t Optional parameters, length: %u", bgpo.bgpo_optlen); 2307 2308 /* some little sanity checking */ 2309 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) 2310 return; 2311 2312 /* ugly! */ 2313 opt = &((const struct bgp_open *)dat)->bgpo_optlen; 2314 opt++; 2315 2316 i = 0; 2317 while (i < bgpo.bgpo_optlen) { 2318 TCHECK2(opt[i], BGP_OPT_SIZE); 2319 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); 2320 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { 2321 printf("\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len); 2322 break; 2323 } 2324 2325 printf("\n\t Option %s (%u), length: %u", 2326 tok2strbuf(bgp_opt_values,"Unknown", 2327 bgpopt.bgpopt_type, 2328 tokbuf, sizeof(tokbuf)), 2329 bgpopt.bgpopt_type, 2330 bgpopt.bgpopt_len); 2331 2332 /* now let's decode the options we know*/ 2333 switch(bgpopt.bgpopt_type) { 2334 2335 case BGP_OPT_CAP: 2336 bgp_capabilities_print(&opt[i+BGP_OPT_SIZE], 2337 bgpopt.bgpopt_len); 2338 break; 2339 2340 case BGP_OPT_AUTH: 2341 default: 2342 printf("\n\t no decoder for option %u", 2343 bgpopt.bgpopt_type); 2344 break; 2345 } 2346 i += BGP_OPT_SIZE + bgpopt.bgpopt_len; 2347 } 2348 return; 2349 trunc: 2350 printf("[|BGP]"); 2351 } 2352 2353 static void 2354 bgp_update_print(const u_char *dat, int length) 2355 { 2356 struct bgp bgp; 2357 const u_char *p; 2358 int withdrawn_routes_len; 2359 int len; 2360 int i; 2361 char tokbuf[TOKBUFSIZE]; 2362 #ifndef INET6 2363 char buf[MAXHOSTNAMELEN + 100]; 2364 int wpfx; 2365 #endif 2366 2367 TCHECK2(dat[0], BGP_SIZE); 2368 if (length < BGP_SIZE) 2369 goto trunc; 2370 memcpy(&bgp, dat, BGP_SIZE); 2371 p = dat + BGP_SIZE; /*XXX*/ 2372 length -= BGP_SIZE; 2373 2374 /* Unfeasible routes */ 2375 TCHECK2(p[0], 2); 2376 if (length < 2) 2377 goto trunc; 2378 withdrawn_routes_len = EXTRACT_16BITS(p); 2379 p += 2; 2380 length -= 2; 2381 if (withdrawn_routes_len) { 2382 /* 2383 * Without keeping state from the original NLRI message, 2384 * it's not possible to tell if this a v4 or v6 route, 2385 * so only try to decode it if we're not v6 enabled. 2386 */ 2387 TCHECK2(p[0], withdrawn_routes_len); 2388 if (length < withdrawn_routes_len) 2389 goto trunc; 2390 #ifdef INET6 2391 printf("\n\t Withdrawn routes: %d bytes", withdrawn_routes_len); 2392 p += withdrawn_routes_len; 2393 length -= withdrawn_routes_len; 2394 #else 2395 if (withdrawn_routes_len < 2) 2396 goto trunc; 2397 length -= 2; 2398 withdrawn_routes_len -= 2; 2399 2400 2401 printf("\n\t Withdrawn routes:"); 2402 2403 while(withdrawn_routes_len > 0) { 2404 wpfx = decode_prefix4(p, withdrawn_routes_len, buf, sizeof(buf)); 2405 if (wpfx == -1) { 2406 printf("\n\t (illegal prefix length)"); 2407 break; 2408 } else if (wpfx == -2) 2409 goto trunc; 2410 else if (wpfx == -3) 2411 goto trunc; /* bytes left, but not enough */ 2412 else { 2413 printf("\n\t %s", buf); 2414 p += wpfx; 2415 length -= wpfx; 2416 withdrawn_routes_len -= wpfx; 2417 } 2418 } 2419 #endif 2420 } 2421 2422 TCHECK2(p[0], 2); 2423 if (length < 2) 2424 goto trunc; 2425 len = EXTRACT_16BITS(p); 2426 p += 2; 2427 length -= 2; 2428 2429 if (withdrawn_routes_len == 0 && len == 0 && length == 0) { 2430 /* No withdrawn routes, no path attributes, no NLRI */ 2431 printf("\n\t End-of-Rib Marker (empty NLRI)"); 2432 return; 2433 } 2434 2435 if (len) { 2436 /* do something more useful!*/ 2437 while (len) { 2438 int aflags, atype, alenlen, alen; 2439 2440 TCHECK2(p[0], 2); 2441 if (len < 2) 2442 goto trunc; 2443 if (length < 2) 2444 goto trunc; 2445 aflags = *p; 2446 atype = *(p + 1); 2447 p += 2; 2448 len -= 2; 2449 length -= 2; 2450 alenlen = bgp_attr_lenlen(aflags, p); 2451 TCHECK2(p[0], alenlen); 2452 if (len < alenlen) 2453 goto trunc; 2454 if (length < alenlen) 2455 goto trunc; 2456 alen = bgp_attr_len(aflags, p); 2457 p += alenlen; 2458 len -= alenlen; 2459 length -= alenlen; 2460 2461 printf("\n\t %s (%u), length: %u", 2462 tok2strbuf(bgp_attr_values, "Unknown Attribute", 2463 atype, 2464 tokbuf, sizeof(tokbuf)), 2465 atype, 2466 alen); 2467 2468 if (aflags) { 2469 printf(", Flags [%s%s%s%s", 2470 aflags & 0x80 ? "O" : "", 2471 aflags & 0x40 ? "T" : "", 2472 aflags & 0x20 ? "P" : "", 2473 aflags & 0x10 ? "E" : ""); 2474 if (aflags & 0xf) 2475 printf("+%x", aflags & 0xf); 2476 printf("]: "); 2477 } 2478 if (len < alen) 2479 goto trunc; 2480 if (length < alen) 2481 goto trunc; 2482 if (!bgp_attr_print(atype, p, alen)) 2483 goto trunc; 2484 p += alen; 2485 len -= alen; 2486 length -= alen; 2487 } 2488 } 2489 2490 if (length) { 2491 /* 2492 * XXX - what if they're using the "Advertisement of 2493 * Multiple Paths in BGP" feature: 2494 * 2495 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/ 2496 * 2497 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06 2498 */ 2499 printf("\n\t Updated routes:"); 2500 while (length) { 2501 char buf[MAXHOSTNAMELEN + 100]; 2502 i = decode_prefix4(p, length, buf, sizeof(buf)); 2503 if (i == -1) { 2504 printf("\n\t (illegal prefix length)"); 2505 break; 2506 } else if (i == -2) 2507 goto trunc; 2508 else if (i == -3) 2509 goto trunc; /* bytes left, but not enough */ 2510 else { 2511 printf("\n\t %s", buf); 2512 p += i; 2513 length -= i; 2514 } 2515 } 2516 } 2517 return; 2518 trunc: 2519 printf("[|BGP]"); 2520 } 2521 2522 static void 2523 bgp_notification_print(const u_char *dat, int length) 2524 { 2525 struct bgp_notification bgpn; 2526 const u_char *tptr; 2527 char tokbuf[TOKBUFSIZE]; 2528 char tokbuf2[TOKBUFSIZE]; 2529 2530 TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); 2531 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); 2532 2533 /* some little sanity checking */ 2534 if (length<BGP_NOTIFICATION_SIZE) 2535 return; 2536 2537 printf(", %s (%u)", 2538 tok2strbuf(bgp_notify_major_values, "Unknown Error", 2539 bgpn.bgpn_major, tokbuf, sizeof(tokbuf)), 2540 bgpn.bgpn_major); 2541 2542 switch (bgpn.bgpn_major) { 2543 2544 case BGP_NOTIFY_MAJOR_MSG: 2545 printf(", subcode %s (%u)", 2546 tok2strbuf(bgp_notify_minor_msg_values, "Unknown", 2547 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2548 bgpn.bgpn_minor); 2549 break; 2550 case BGP_NOTIFY_MAJOR_OPEN: 2551 printf(", subcode %s (%u)", 2552 tok2strbuf(bgp_notify_minor_open_values, "Unknown", 2553 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2554 bgpn.bgpn_minor); 2555 break; 2556 case BGP_NOTIFY_MAJOR_UPDATE: 2557 printf(", subcode %s (%u)", 2558 tok2strbuf(bgp_notify_minor_update_values, "Unknown", 2559 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2560 bgpn.bgpn_minor); 2561 break; 2562 case BGP_NOTIFY_MAJOR_CAP: 2563 printf(" subcode %s (%u)", 2564 tok2strbuf(bgp_notify_minor_cap_values, "Unknown", 2565 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2566 bgpn.bgpn_minor); 2567 case BGP_NOTIFY_MAJOR_CEASE: 2568 printf(", subcode %s (%u)", 2569 tok2strbuf(bgp_notify_minor_cease_values, "Unknown", 2570 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2571 bgpn.bgpn_minor); 2572 2573 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes 2574 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES 2575 */ 2576 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { 2577 tptr = dat + BGP_NOTIFICATION_SIZE; 2578 TCHECK2(*tptr, 7); 2579 printf(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", 2580 tok2strbuf(af_values, "Unknown", 2581 EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)), 2582 EXTRACT_16BITS(tptr), 2583 tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2), 2584 tokbuf2, sizeof(tokbuf)), 2585 *(tptr+2), 2586 EXTRACT_32BITS(tptr+3)); 2587 } 2588 break; 2589 default: 2590 break; 2591 } 2592 2593 return; 2594 trunc: 2595 printf("[|BGP]"); 2596 } 2597 2598 static void 2599 bgp_route_refresh_print(const u_char *pptr, int len) { 2600 2601 const struct bgp_route_refresh *bgp_route_refresh_header; 2602 char tokbuf[TOKBUFSIZE]; 2603 char tokbuf2[TOKBUFSIZE]; 2604 2605 TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE); 2606 2607 /* some little sanity checking */ 2608 if (len<BGP_ROUTE_REFRESH_SIZE) 2609 return; 2610 2611 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; 2612 2613 printf("\n\t AFI %s (%u), SAFI %s (%u)", 2614 tok2strbuf(af_values,"Unknown", 2615 /* this stinks but the compiler pads the structure 2616 * weird */ 2617 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2618 tokbuf, sizeof(tokbuf)), 2619 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2620 tok2strbuf(bgp_safi_values,"Unknown", 2621 bgp_route_refresh_header->safi, 2622 tokbuf2, sizeof(tokbuf2)), 2623 bgp_route_refresh_header->safi); 2624 2625 if (vflag > 1) { 2626 TCHECK2(*pptr, len); 2627 print_unknown_data(pptr,"\n\t ", len); 2628 } 2629 2630 return; 2631 trunc: 2632 printf("[|BGP]"); 2633 } 2634 2635 static int 2636 bgp_header_print(const u_char *dat, int length) 2637 { 2638 struct bgp bgp; 2639 char tokbuf[TOKBUFSIZE]; 2640 2641 TCHECK2(dat[0], BGP_SIZE); 2642 memcpy(&bgp, dat, BGP_SIZE); 2643 printf("\n\t%s Message (%u), length: %u", 2644 tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type, 2645 tokbuf, sizeof(tokbuf)), 2646 bgp.bgp_type, 2647 length); 2648 2649 switch (bgp.bgp_type) { 2650 case BGP_OPEN: 2651 bgp_open_print(dat, length); 2652 break; 2653 case BGP_UPDATE: 2654 bgp_update_print(dat, length); 2655 break; 2656 case BGP_NOTIFICATION: 2657 bgp_notification_print(dat, length); 2658 break; 2659 case BGP_KEEPALIVE: 2660 break; 2661 case BGP_ROUTE_REFRESH: 2662 bgp_route_refresh_print(dat, length); 2663 break; 2664 default: 2665 /* we have no decoder for the BGP message */ 2666 TCHECK2(*dat, length); 2667 printf("\n\t no Message %u decoder",bgp.bgp_type); 2668 print_unknown_data(dat,"\n\t ",length); 2669 break; 2670 } 2671 return 1; 2672 trunc: 2673 printf("[|BGP]"); 2674 return 0; 2675 } 2676 2677 void 2678 bgp_print(const u_char *dat, int length) 2679 { 2680 const u_char *p; 2681 const u_char *ep; 2682 const u_char *start; 2683 const u_char marker[] = { 2684 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2685 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2686 }; 2687 struct bgp bgp; 2688 u_int16_t hlen; 2689 char tokbuf[TOKBUFSIZE]; 2690 2691 ep = dat + length; 2692 if (snapend < dat + length) 2693 ep = snapend; 2694 2695 printf(": BGP, length: %u",length); 2696 2697 if (vflag < 1) /* lets be less chatty */ 2698 return; 2699 2700 p = dat; 2701 start = p; 2702 while (p < ep) { 2703 if (!TTEST2(p[0], 1)) 2704 break; 2705 if (p[0] != 0xff) { 2706 p++; 2707 continue; 2708 } 2709 2710 if (!TTEST2(p[0], sizeof(marker))) 2711 break; 2712 if (memcmp(p, marker, sizeof(marker)) != 0) { 2713 p++; 2714 continue; 2715 } 2716 2717 /* found BGP header */ 2718 TCHECK2(p[0], BGP_SIZE); /*XXX*/ 2719 memcpy(&bgp, p, BGP_SIZE); 2720 2721 if (start != p) 2722 printf(" [|BGP]"); 2723 2724 hlen = ntohs(bgp.bgp_len); 2725 if (hlen < BGP_SIZE) { 2726 printf("\n[|BGP Bogus header length %u < %u]", hlen, 2727 BGP_SIZE); 2728 break; 2729 } 2730 2731 if (TTEST2(p[0], hlen)) { 2732 if (!bgp_header_print(p, hlen)) 2733 return; 2734 p += hlen; 2735 start = p; 2736 } else { 2737 printf("\n[|BGP %s]", 2738 tok2strbuf(bgp_msg_values, 2739 "Unknown Message Type", 2740 bgp.bgp_type, 2741 tokbuf, sizeof(tokbuf))); 2742 break; 2743 } 2744 } 2745 2746 return; 2747 2748 trunc: 2749 printf(" [|BGP]"); 2750 } 2751 2752 /* 2753 * Local Variables: 2754 * c-style: whitesmith 2755 * c-basic-offset: 4 2756 * End: 2757 */ 2758