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 #define NETDISSECT_REWORKED 34 #ifdef HAVE_CONFIG_H 35 #include "config.h" 36 #endif 37 38 #include <tcpdump-stdinc.h> 39 40 #include <stdio.h> 41 #include <string.h> 42 43 #include "interface.h" 44 #include "addrtoname.h" 45 #include "extract.h" 46 #include "af.h" 47 #include "l2vpn.h" 48 49 struct bgp { 50 uint8_t bgp_marker[16]; 51 uint16_t bgp_len; 52 uint8_t bgp_type; 53 }; 54 #define BGP_SIZE 19 /* unaligned */ 55 56 #define BGP_OPEN 1 57 #define BGP_UPDATE 2 58 #define BGP_NOTIFICATION 3 59 #define BGP_KEEPALIVE 4 60 #define BGP_ROUTE_REFRESH 5 61 62 static const struct tok bgp_msg_values[] = { 63 { BGP_OPEN, "Open"}, 64 { BGP_UPDATE, "Update"}, 65 { BGP_NOTIFICATION, "Notification"}, 66 { BGP_KEEPALIVE, "Keepalive"}, 67 { BGP_ROUTE_REFRESH, "Route Refresh"}, 68 { 0, NULL} 69 }; 70 71 struct bgp_open { 72 uint8_t bgpo_marker[16]; 73 uint16_t bgpo_len; 74 uint8_t bgpo_type; 75 uint8_t bgpo_version; 76 uint16_t bgpo_myas; 77 uint16_t bgpo_holdtime; 78 uint32_t bgpo_id; 79 uint8_t bgpo_optlen; 80 /* options should follow */ 81 }; 82 #define BGP_OPEN_SIZE 29 /* unaligned */ 83 84 struct bgp_opt { 85 uint8_t bgpopt_type; 86 uint8_t bgpopt_len; 87 /* variable length */ 88 }; 89 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */ 90 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */ 91 92 struct bgp_notification { 93 uint8_t bgpn_marker[16]; 94 uint16_t bgpn_len; 95 uint8_t bgpn_type; 96 uint8_t bgpn_major; 97 uint8_t bgpn_minor; 98 }; 99 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */ 100 101 struct bgp_route_refresh { 102 uint8_t bgp_marker[16]; 103 uint16_t len; 104 uint8_t type; 105 uint8_t afi[2]; /* the compiler messes this structure up */ 106 uint8_t res; /* when doing misaligned sequences of int8 and int16 */ 107 uint8_t safi; /* afi should be int16 - so we have to access it using */ 108 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */ 109 #define BGP_ROUTE_REFRESH_SIZE 23 110 111 #define bgp_attr_lenlen(flags, p) \ 112 (((flags) & 0x10) ? 2 : 1) 113 #define bgp_attr_len(flags, p) \ 114 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p)) 115 116 #define BGPTYPE_ORIGIN 1 117 #define BGPTYPE_AS_PATH 2 118 #define BGPTYPE_NEXT_HOP 3 119 #define BGPTYPE_MULTI_EXIT_DISC 4 120 #define BGPTYPE_LOCAL_PREF 5 121 #define BGPTYPE_ATOMIC_AGGREGATE 6 122 #define BGPTYPE_AGGREGATOR 7 123 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */ 124 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */ 125 #define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */ 126 #define BGPTYPE_DPA 11 /* draft-ietf-idr-bgp-dpa */ 127 #define BGPTYPE_ADVERTISERS 12 /* RFC1863 */ 128 #define BGPTYPE_RCID_PATH 13 /* RFC1863 */ 129 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */ 130 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */ 131 #define BGPTYPE_EXTD_COMMUNITIES 16 /* draft-ietf-idr-bgp-ext-communities */ 132 #define BGPTYPE_AS4_PATH 17 /* RFC4893 */ 133 #define BGPTYPE_AGGREGATOR4 18 /* RFC4893 */ 134 #define BGPTYPE_PMSI_TUNNEL 22 /* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */ 135 #define BGPTYPE_ATTR_SET 128 /* draft-marques-ppvpn-ibgp */ 136 137 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */ 138 139 static const struct tok bgp_attr_values[] = { 140 { BGPTYPE_ORIGIN, "Origin"}, 141 { BGPTYPE_AS_PATH, "AS Path"}, 142 { BGPTYPE_AS4_PATH, "AS4 Path"}, 143 { BGPTYPE_NEXT_HOP, "Next Hop"}, 144 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"}, 145 { BGPTYPE_LOCAL_PREF, "Local Preference"}, 146 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"}, 147 { BGPTYPE_AGGREGATOR, "Aggregator"}, 148 { BGPTYPE_AGGREGATOR4, "Aggregator4"}, 149 { BGPTYPE_COMMUNITIES, "Community"}, 150 { BGPTYPE_ORIGINATOR_ID, "Originator ID"}, 151 { BGPTYPE_CLUSTER_LIST, "Cluster List"}, 152 { BGPTYPE_DPA, "DPA"}, 153 { BGPTYPE_ADVERTISERS, "Advertisers"}, 154 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"}, 155 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"}, 156 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"}, 157 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"}, 158 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"}, 159 { BGPTYPE_ATTR_SET, "Attribute Set"}, 160 { 255, "Reserved for development"}, 161 { 0, NULL} 162 }; 163 164 #define BGP_AS_SET 1 165 #define BGP_AS_SEQUENCE 2 166 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */ 167 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */ 168 169 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET 170 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET 171 172 static const struct tok bgp_as_path_segment_open_values[] = { 173 { BGP_AS_SEQUENCE, ""}, 174 { BGP_AS_SET, "{ "}, 175 { BGP_CONFED_AS_SEQUENCE, "( "}, 176 { BGP_CONFED_AS_SET, "({ "}, 177 { 0, NULL} 178 }; 179 180 static const struct tok bgp_as_path_segment_close_values[] = { 181 { BGP_AS_SEQUENCE, ""}, 182 { BGP_AS_SET, "}"}, 183 { BGP_CONFED_AS_SEQUENCE, ")"}, 184 { BGP_CONFED_AS_SET, "})"}, 185 { 0, NULL} 186 }; 187 188 #define BGP_OPT_AUTH 1 189 #define BGP_OPT_CAP 2 190 191 192 static const struct tok bgp_opt_values[] = { 193 { BGP_OPT_AUTH, "Authentication Information"}, 194 { BGP_OPT_CAP, "Capabilities Advertisement"}, 195 { 0, NULL} 196 }; 197 198 #define BGP_CAPCODE_MP 1 199 #define BGP_CAPCODE_RR 2 200 #define BGP_CAPCODE_ORF 3 /* XXX */ 201 #define BGP_CAPCODE_RESTART 64 /* draft-ietf-idr-restart-05 */ 202 #define BGP_CAPCODE_AS_NEW 65 /* XXX */ 203 #define BGP_CAPCODE_DYN_CAP 67 /* XXX */ 204 #define BGP_CAPCODE_RR_CISCO 128 205 206 static const struct tok bgp_capcode_values[] = { 207 { BGP_CAPCODE_MP, "Multiprotocol Extensions"}, 208 { BGP_CAPCODE_RR, "Route Refresh"}, 209 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"}, 210 { BGP_CAPCODE_RESTART, "Graceful Restart"}, 211 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"}, 212 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"}, 213 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"}, 214 { 0, NULL} 215 }; 216 217 #define BGP_NOTIFY_MAJOR_MSG 1 218 #define BGP_NOTIFY_MAJOR_OPEN 2 219 #define BGP_NOTIFY_MAJOR_UPDATE 3 220 #define BGP_NOTIFY_MAJOR_HOLDTIME 4 221 #define BGP_NOTIFY_MAJOR_FSM 5 222 #define BGP_NOTIFY_MAJOR_CEASE 6 223 #define BGP_NOTIFY_MAJOR_CAP 7 224 225 static const struct tok bgp_notify_major_values[] = { 226 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"}, 227 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"}, 228 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"}, 229 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"}, 230 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"}, 231 { BGP_NOTIFY_MAJOR_CEASE, "Cease"}, 232 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"}, 233 { 0, NULL} 234 }; 235 236 /* draft-ietf-idr-cease-subcode-02 */ 237 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1 238 static const struct tok bgp_notify_minor_cease_values[] = { 239 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"}, 240 { 2, "Administratively Shutdown"}, 241 { 3, "Peer Unconfigured"}, 242 { 4, "Administratively Reset"}, 243 { 5, "Connection Rejected"}, 244 { 6, "Other Configuration Change"}, 245 { 7, "Connection Collision Resolution"}, 246 { 0, NULL} 247 }; 248 249 static const struct tok bgp_notify_minor_msg_values[] = { 250 { 1, "Connection Not Synchronized"}, 251 { 2, "Bad Message Length"}, 252 { 3, "Bad Message Type"}, 253 { 0, NULL} 254 }; 255 256 static const struct tok bgp_notify_minor_open_values[] = { 257 { 1, "Unsupported Version Number"}, 258 { 2, "Bad Peer AS"}, 259 { 3, "Bad BGP Identifier"}, 260 { 4, "Unsupported Optional Parameter"}, 261 { 5, "Authentication Failure"}, 262 { 6, "Unacceptable Hold Time"}, 263 { 7, "Capability Message Error"}, 264 { 0, NULL} 265 }; 266 267 static const struct tok bgp_notify_minor_update_values[] = { 268 { 1, "Malformed Attribute List"}, 269 { 2, "Unrecognized Well-known Attribute"}, 270 { 3, "Missing Well-known Attribute"}, 271 { 4, "Attribute Flags Error"}, 272 { 5, "Attribute Length Error"}, 273 { 6, "Invalid ORIGIN Attribute"}, 274 { 7, "AS Routing Loop"}, 275 { 8, "Invalid NEXT_HOP Attribute"}, 276 { 9, "Optional Attribute Error"}, 277 { 10, "Invalid Network Field"}, 278 { 11, "Malformed AS_PATH"}, 279 { 0, NULL} 280 }; 281 282 static const struct tok bgp_notify_minor_cap_values[] = { 283 { 1, "Invalid Action Value" }, 284 { 2, "Invalid Capability Length" }, 285 { 3, "Malformed Capability Value" }, 286 { 4, "Unsupported Capability Code" }, 287 { 0, NULL } 288 }; 289 290 static const struct tok bgp_origin_values[] = { 291 { 0, "IGP"}, 292 { 1, "EGP"}, 293 { 2, "Incomplete"}, 294 { 0, NULL} 295 }; 296 297 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1 298 #define BGP_PMSI_TUNNEL_LDP_P2MP 2 299 #define BGP_PMSI_TUNNEL_PIM_SSM 3 300 #define BGP_PMSI_TUNNEL_PIM_SM 4 301 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5 302 #define BGP_PMSI_TUNNEL_INGRESS 6 303 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7 304 305 static const struct tok bgp_pmsi_tunnel_values[] = { 306 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"}, 307 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"}, 308 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"}, 309 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"}, 310 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"}, 311 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"}, 312 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"}, 313 { 0, NULL} 314 }; 315 316 static const struct tok bgp_pmsi_flag_values[] = { 317 { 0x01, "Leaf Information required"}, 318 { 0, NULL} 319 }; 320 321 322 /* Subsequent address family identifier, RFC2283 section 7 */ 323 #define SAFNUM_RES 0 324 #define SAFNUM_UNICAST 1 325 #define SAFNUM_MULTICAST 2 326 #define SAFNUM_UNIMULTICAST 3 327 /* labeled BGP RFC3107 */ 328 #define SAFNUM_LABUNICAST 4 329 /* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */ 330 #define SAFNUM_MULTICAST_VPN 5 331 #define SAFNUM_TUNNEL 64 /* XXX */ 332 #define SAFNUM_VPLS 65 /* XXX */ 333 /* draft-nalawade-idr-mdt-safi-03 */ 334 #define SAFNUM_MDT 66 335 /* Section 4.3.4 of draft-rosen-rfc2547bis-03.txt */ 336 #define SAFNUM_VPNUNICAST 128 337 #define SAFNUM_VPNMULTICAST 129 338 #define SAFNUM_VPNUNIMULTICAST 130 339 /* draft-marques-ppvpn-rt-constrain-01.txt */ 340 #define SAFNUM_RT_ROUTING_INFO 132 341 342 #define BGP_VPN_RD_LEN 8 343 344 static const struct tok bgp_safi_values[] = { 345 { SAFNUM_RES, "Reserved"}, 346 { SAFNUM_UNICAST, "Unicast"}, 347 { SAFNUM_MULTICAST, "Multicast"}, 348 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"}, 349 { SAFNUM_LABUNICAST, "labeled Unicast"}, 350 { SAFNUM_TUNNEL, "Tunnel"}, 351 { SAFNUM_VPLS, "VPLS"}, 352 { SAFNUM_MDT, "MDT"}, 353 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"}, 354 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"}, 355 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"}, 356 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"}, 357 { SAFNUM_MULTICAST_VPN, "Multicast VPN"}, 358 { 0, NULL } 359 }; 360 361 /* well-known community */ 362 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01 363 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02 364 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 365 366 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */ 367 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */ 368 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */ 369 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */ 370 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */ 371 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */ 372 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */ 373 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */ 374 /* rfc2547 bgp-mpls-vpns */ 375 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */ 376 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */ 377 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */ 378 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */ 379 380 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */ 381 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */ 382 383 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */ 384 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */ 385 386 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */ 387 388 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 389 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 390 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */ 391 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */ 392 393 394 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */ 395 #define BGP_EXT_COM_EIGRP_GEN 0x8800 396 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801 397 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802 398 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803 399 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804 400 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805 401 402 static const struct tok bgp_extd_comm_flag_values[] = { 403 { 0x8000, "vendor-specific"}, 404 { 0x4000, "non-transitive"}, 405 { 0, NULL}, 406 }; 407 408 static const struct tok bgp_extd_comm_subtype_values[] = { 409 { BGP_EXT_COM_RT_0, "target"}, 410 { BGP_EXT_COM_RT_1, "target"}, 411 { BGP_EXT_COM_RT_2, "target"}, 412 { BGP_EXT_COM_RO_0, "origin"}, 413 { BGP_EXT_COM_RO_1, "origin"}, 414 { BGP_EXT_COM_RO_2, "origin"}, 415 { BGP_EXT_COM_LINKBAND, "link-BW"}, 416 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"}, 417 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"}, 418 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"}, 419 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"}, 420 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"}, 421 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"}, 422 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"}, 423 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"}, 424 { BGP_EXT_COM_L2INFO, "layer2-info"}, 425 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" }, 426 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" }, 427 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" }, 428 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" }, 429 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" }, 430 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" }, 431 { BGP_EXT_COM_SOURCE_AS, "source-AS" }, 432 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"}, 433 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"}, 434 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"}, 435 { 0, NULL}, 436 }; 437 438 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */ 439 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */ 440 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */ 441 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */ 442 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */ 443 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/ 444 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */ 445 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */ 446 447 static const struct tok bgp_extd_comm_ospf_rtype_values[] = { 448 { BGP_OSPF_RTYPE_RTR, "Router" }, 449 { BGP_OSPF_RTYPE_NET, "Network" }, 450 { BGP_OSPF_RTYPE_SUM, "Summary" }, 451 { BGP_OSPF_RTYPE_EXT, "External" }, 452 { BGP_OSPF_RTYPE_NSSA,"NSSA External" }, 453 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" }, 454 { 0, NULL }, 455 }; 456 457 #define TOKBUFSIZE 128 458 static char astostr[20]; 459 460 /* 461 * as_printf 462 * 463 * Convert an AS number into a string and return string pointer. 464 * 465 * Depending on bflag is set or not, AS number is converted into ASDOT notation 466 * or plain number notation. 467 * 468 */ 469 static char * 470 as_printf(netdissect_options *ndo, 471 char *str, int size, u_int asnum) 472 { 473 if (!ndo->ndo_bflag || asnum <= 0xFFFF) { 474 snprintf(str, size, "%u", asnum); 475 } else { 476 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF); 477 } 478 return str; 479 } 480 481 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv; 482 483 int 484 decode_prefix4(netdissect_options *ndo, 485 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 486 { 487 struct in_addr addr; 488 u_int plen, plenbytes; 489 490 ND_TCHECK(pptr[0]); 491 ITEMCHECK(1); 492 plen = pptr[0]; 493 if (32 < plen) 494 return -1; 495 itemlen -= 1; 496 497 memset(&addr, 0, sizeof(addr)); 498 plenbytes = (plen + 7) / 8; 499 ND_TCHECK2(pptr[1], plenbytes); 500 ITEMCHECK(plenbytes); 501 memcpy(&addr, &pptr[1], plenbytes); 502 if (plen % 8) { 503 ((u_char *)&addr)[plenbytes - 1] &= 504 ((0xff00 >> (plen % 8)) & 0xff); 505 } 506 snprintf(buf, buflen, "%s/%d", getname(ndo, (u_char *)&addr), plen); 507 return 1 + plenbytes; 508 509 trunc: 510 return -2; 511 512 badtlv: 513 return -3; 514 } 515 516 static int 517 decode_labeled_prefix4(netdissect_options *ndo, 518 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 519 { 520 struct in_addr addr; 521 u_int plen, plenbytes; 522 523 /* prefix length and label = 4 bytes */ 524 ND_TCHECK2(pptr[0], 4); 525 ITEMCHECK(4); 526 plen = pptr[0]; /* get prefix length */ 527 528 /* this is one of the weirdnesses of rfc3107 529 the label length (actually the label + COS bits) 530 is added to the prefix length; 531 we also do only read out just one label - 532 there is no real application for advertisement of 533 stacked labels in a a single BGP message 534 */ 535 536 if (24 > plen) 537 return -1; 538 539 plen-=24; /* adjust prefixlen - labellength */ 540 541 if (32 < plen) 542 return -1; 543 itemlen -= 4; 544 545 memset(&addr, 0, sizeof(addr)); 546 plenbytes = (plen + 7) / 8; 547 ND_TCHECK2(pptr[4], plenbytes); 548 ITEMCHECK(plenbytes); 549 memcpy(&addr, &pptr[4], plenbytes); 550 if (plen % 8) { 551 ((u_char *)&addr)[plenbytes - 1] &= 552 ((0xff00 >> (plen % 8)) & 0xff); 553 } 554 /* the label may get offsetted by 4 bits so lets shift it right */ 555 snprintf(buf, buflen, "%s/%d, label:%u %s", 556 getname(ndo, (u_char *)&addr), 557 plen, 558 EXTRACT_24BITS(pptr+1)>>4, 559 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 560 561 return 4 + plenbytes; 562 563 trunc: 564 return -2; 565 566 badtlv: 567 return -3; 568 } 569 570 /* 571 * bgp_vpn_ip_print 572 * 573 * print an ipv4 or ipv6 address into a buffer dependend on address length. 574 */ 575 static char * 576 bgp_vpn_ip_print(netdissect_options *ndo, 577 const u_char *pptr, u_int addr_length) { 578 579 /* worst case string is s fully formatted v6 address */ 580 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")]; 581 char *pos = addr; 582 583 switch(addr_length) { 584 case (sizeof(struct in_addr) << 3): /* 32 */ 585 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 586 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr)); 587 break; 588 #ifdef INET6 589 case (sizeof(struct in6_addr) << 3): /* 128 */ 590 ND_TCHECK2(pptr[0], sizeof(struct in6_addr)); 591 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr)); 592 break; 593 #endif 594 default: 595 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length); 596 break; 597 } 598 pos += strlen(pos); 599 600 trunc: 601 *(pos) = '\0'; 602 return (addr); 603 } 604 605 /* 606 * bgp_vpn_sg_print 607 * 608 * print an multicast s,g entry into a buffer. 609 * the s,g entry is encoded like this. 610 * 611 * +-----------------------------------+ 612 * | Multicast Source Length (1 octet) | 613 * +-----------------------------------+ 614 * | Multicast Source (Variable) | 615 * +-----------------------------------+ 616 * | Multicast Group Length (1 octet) | 617 * +-----------------------------------+ 618 * | Multicast Group (Variable) | 619 * +-----------------------------------+ 620 * 621 * return the number of bytes read from the wire. 622 */ 623 static int 624 bgp_vpn_sg_print(netdissect_options *ndo, 625 const u_char *pptr, char *buf, u_int buflen) { 626 627 uint8_t addr_length; 628 u_int total_length, offset; 629 630 total_length = 0; 631 632 /* Source address length, encoded in bits */ 633 ND_TCHECK2(pptr[0], 1); 634 addr_length = *pptr++; 635 636 /* Source address */ 637 ND_TCHECK2(pptr[0], (addr_length >> 3)); 638 total_length += (addr_length >> 3) + 1; 639 offset = strlen(buf); 640 if (addr_length) { 641 snprintf(buf + offset, buflen - offset, ", Source %s", 642 bgp_vpn_ip_print(ndo, pptr, addr_length)); 643 pptr += (addr_length >> 3); 644 } 645 646 /* Group address length, encoded in bits */ 647 ND_TCHECK2(pptr[0], 1); 648 addr_length = *pptr++; 649 650 /* Group address */ 651 ND_TCHECK2(pptr[0], (addr_length >> 3)); 652 total_length += (addr_length >> 3) + 1; 653 offset = strlen(buf); 654 if (addr_length) { 655 snprintf(buf + offset, buflen - offset, ", Group %s", 656 bgp_vpn_ip_print(ndo, pptr, addr_length)); 657 pptr += (addr_length >> 3); 658 } 659 660 trunc: 661 return (total_length); 662 } 663 664 665 /* RDs and RTs share the same semantics 666 * we use bgp_vpn_rd_print for 667 * printing route targets inside a NLRI */ 668 char * 669 bgp_vpn_rd_print(netdissect_options *ndo, 670 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(ndo, 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(netdissect_options *ndo, 711 const u_char *pptr, char *buf, u_int buflen) 712 { 713 uint8_t route_target[8]; 714 u_int plen; 715 716 ND_TCHECK(pptr[0]); 717 plen = pptr[0]; /* get prefix length */ 718 719 if (0 == plen) 720 return 1; /* default route target */ 721 722 if (32 > plen) 723 return -1; 724 725 plen-=32; /* adjust prefix length */ 726 727 if (64 < plen) 728 return -1; 729 730 memset(&route_target, 0, sizeof(route_target)); 731 ND_TCHECK2(pptr[1], (plen + 7) / 8); 732 memcpy(&route_target, &pptr[1], (plen + 7) / 8); 733 if (plen % 8) { 734 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= 735 ((0xff00 >> (plen % 8)) & 0xff); 736 } 737 snprintf(buf, buflen, "origin AS: %s, route target %s", 738 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)), 739 bgp_vpn_rd_print(ndo, (u_char *)&route_target)); 740 741 return 5 + (plen + 7) / 8; 742 743 trunc: 744 return -2; 745 } 746 747 static int 748 decode_labeled_vpn_prefix4(netdissect_options *ndo, 749 const u_char *pptr, char *buf, u_int buflen) 750 { 751 struct in_addr addr; 752 u_int plen; 753 754 ND_TCHECK(pptr[0]); 755 plen = pptr[0]; /* get prefix length */ 756 757 if ((24+64) > plen) 758 return -1; 759 760 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 761 762 if (32 < plen) 763 return -1; 764 765 memset(&addr, 0, sizeof(addr)); 766 ND_TCHECK2(pptr[12], (plen + 7) / 8); 767 memcpy(&addr, &pptr[12], (plen + 7) / 8); 768 if (plen % 8) { 769 ((u_char *)&addr)[(plen + 7) / 8 - 1] &= 770 ((0xff00 >> (plen % 8)) & 0xff); 771 } 772 /* the label may get offsetted by 4 bits so lets shift it right */ 773 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 774 bgp_vpn_rd_print(ndo, pptr+4), 775 getname(ndo, (u_char *)&addr), 776 plen, 777 EXTRACT_24BITS(pptr+1)>>4, 778 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 779 780 return 12 + (plen + 7) / 8; 781 782 trunc: 783 return -2; 784 } 785 786 /* 787 * +-------------------------------+ 788 * | | 789 * | RD:IPv4-address (12 octets) | 790 * | | 791 * +-------------------------------+ 792 * | MDT Group-address (4 octets) | 793 * +-------------------------------+ 794 */ 795 796 #define MDT_VPN_NLRI_LEN 16 797 798 static int 799 decode_mdt_vpn_nlri(netdissect_options *ndo, 800 const u_char *pptr, char *buf, u_int buflen) 801 { 802 803 const u_char *rd; 804 const u_char *vpn_ip; 805 806 ND_TCHECK(pptr[0]); 807 808 /* if the NLRI is not predefined length, quit.*/ 809 if (*pptr != MDT_VPN_NLRI_LEN * 8) 810 return -1; 811 pptr++; 812 813 /* RD */ 814 ND_TCHECK2(pptr[0], 8); 815 rd = pptr; 816 pptr+=8; 817 818 /* IPv4 address */ 819 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 820 vpn_ip = pptr; 821 pptr+=sizeof(struct in_addr); 822 823 /* MDT Group Address */ 824 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 825 826 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s", 827 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr)); 828 829 return MDT_VPN_NLRI_LEN + 1; 830 831 trunc: 832 833 return -2; 834 } 835 836 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1 837 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2 838 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3 839 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4 840 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5 841 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6 842 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7 843 844 static const struct tok bgp_multicast_vpn_route_type_values[] = { 845 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"}, 846 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"}, 847 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"}, 848 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"}, 849 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"}, 850 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"}, 851 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"}, 852 }; 853 854 static int 855 decode_multicast_vpn(netdissect_options *ndo, 856 const u_char *pptr, char *buf, u_int buflen) 857 { 858 uint8_t route_type, route_length, addr_length, sg_length; 859 u_int offset; 860 861 ND_TCHECK2(pptr[0], 2); 862 route_type = *pptr++; 863 route_length = *pptr++; 864 865 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", 866 tok2str(bgp_multicast_vpn_route_type_values, 867 "Unknown", route_type), 868 route_type, route_length); 869 870 switch(route_type) { 871 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: 872 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 873 offset = strlen(buf); 874 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", 875 bgp_vpn_rd_print(ndo, pptr), 876 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN, 877 (route_length - BGP_VPN_RD_LEN) << 3)); 878 break; 879 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: 880 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); 881 offset = strlen(buf); 882 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 883 bgp_vpn_rd_print(ndo, pptr), 884 as_printf(ndo, astostr, sizeof(astostr), 885 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 886 break; 887 888 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: 889 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 890 offset = strlen(buf); 891 snprintf(buf + offset, buflen - offset, ", RD: %s", 892 bgp_vpn_rd_print(ndo, pptr)); 893 pptr += BGP_VPN_RD_LEN; 894 895 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen); 896 addr_length = route_length - sg_length; 897 898 ND_TCHECK2(pptr[0], addr_length); 899 offset = strlen(buf); 900 snprintf(buf + offset, buflen - offset, ", Originator %s", 901 bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); 902 break; 903 904 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: 905 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 906 offset = strlen(buf); 907 snprintf(buf + offset, buflen - offset, ", RD: %s", 908 bgp_vpn_rd_print(ndo, pptr)); 909 pptr += BGP_VPN_RD_LEN; 910 911 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 912 break; 913 914 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ 915 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: 916 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 917 offset = strlen(buf); 918 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 919 bgp_vpn_rd_print(ndo, pptr), 920 as_printf(ndo, astostr, sizeof(astostr), 921 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 922 pptr += BGP_VPN_RD_LEN; 923 924 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 925 break; 926 927 /* 928 * no per route-type printing yet. 929 */ 930 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: 931 default: 932 break; 933 } 934 935 return route_length + 2; 936 937 trunc: 938 return -2; 939 } 940 941 /* 942 * As I remember, some versions of systems have an snprintf() that 943 * returns -1 if the buffer would have overflowed. If the return 944 * value is negative, set buflen to 0, to indicate that we've filled 945 * the buffer up. 946 * 947 * If the return value is greater than buflen, that means that 948 * the buffer would have overflowed; again, set buflen to 0 in 949 * that case. 950 */ 951 #define UPDATE_BUF_BUFLEN(buf, buflen, strlen) \ 952 if (strlen<0) \ 953 buflen=0; \ 954 else if ((u_int)strlen>buflen) \ 955 buflen=0; \ 956 else { \ 957 buflen-=strlen; \ 958 buf+=strlen; \ 959 } 960 961 static int 962 decode_labeled_vpn_l2(netdissect_options *ndo, 963 const u_char *pptr, char *buf, u_int buflen) 964 { 965 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len; 966 967 ND_TCHECK2(pptr[0], 2); 968 plen=EXTRACT_16BITS(pptr); 969 tlen=plen; 970 pptr+=2; 971 /* Old and new L2VPN NLRI share AFI/SAFI 972 * -> Assume a 12 Byte-length NLRI is auto-discovery-only 973 * and > 17 as old format. Complain for the middle case 974 */ 975 if (plen==12) { 976 /* assume AD-only with RD, BGPNH */ 977 ND_TCHECK2(pptr[0],12); 978 buf[0]='\0'; 979 strlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s", 980 bgp_vpn_rd_print(ndo, pptr), 981 /* need something like getname(ndo, ) here */ 982 getname(ndo, pptr+8) 983 ); 984 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 985 pptr+=12; 986 tlen-=12; 987 return plen; 988 } else if (plen>17) { 989 /* assume old format */ 990 /* RD, ID, LBLKOFF, LBLBASE */ 991 992 ND_TCHECK2(pptr[0],15); 993 buf[0]='\0'; 994 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", 995 bgp_vpn_rd_print(ndo, pptr), 996 EXTRACT_16BITS(pptr+8), 997 EXTRACT_16BITS(pptr+10), 998 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ 999 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1000 pptr+=15; 1001 tlen-=15; 1002 1003 /* ok now the variable part - lets read out TLVs*/ 1004 while (tlen>0) { 1005 if (tlen < 3) 1006 return -1; 1007 ND_TCHECK2(pptr[0], 3); 1008 tlv_type=*pptr++; 1009 tlv_len=EXTRACT_16BITS(pptr); 1010 ttlv_len=tlv_len; 1011 pptr+=2; 1012 1013 switch(tlv_type) { 1014 case 1: 1015 if (buflen!=0) { 1016 strlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", 1017 tlv_type, 1018 tlv_len); 1019 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1020 } 1021 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */ 1022 while (ttlv_len>0) { 1023 ND_TCHECK(pptr[0]); 1024 if (buflen!=0) { 1025 strlen=snprintf(buf,buflen, "%02x",*pptr++); 1026 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1027 } 1028 ttlv_len--; 1029 } 1030 break; 1031 default: 1032 if (buflen!=0) { 1033 strlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", 1034 tlv_type, 1035 tlv_len); 1036 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1037 } 1038 break; 1039 } 1040 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */ 1041 } 1042 return plen+2; 1043 1044 } else { 1045 /* complain bitterly ? */ 1046 /* fall through */ 1047 goto trunc; 1048 } 1049 1050 trunc: 1051 return -2; 1052 } 1053 1054 #ifdef INET6 1055 int 1056 decode_prefix6(netdissect_options *ndo, 1057 const u_char *pd, u_int itemlen, char *buf, u_int buflen) 1058 { 1059 struct in6_addr addr; 1060 u_int plen, plenbytes; 1061 1062 ND_TCHECK(pd[0]); 1063 ITEMCHECK(1); 1064 plen = pd[0]; 1065 if (128 < plen) 1066 return -1; 1067 itemlen -= 1; 1068 1069 memset(&addr, 0, sizeof(addr)); 1070 plenbytes = (plen + 7) / 8; 1071 ND_TCHECK2(pd[1], plenbytes); 1072 ITEMCHECK(plenbytes); 1073 memcpy(&addr, &pd[1], plenbytes); 1074 if (plen % 8) { 1075 addr.s6_addr[plenbytes - 1] &= 1076 ((0xff00 >> (plen % 8)) & 0xff); 1077 } 1078 snprintf(buf, buflen, "%s/%d", getname6(ndo, (u_char *)&addr), plen); 1079 return 1 + plenbytes; 1080 1081 trunc: 1082 return -2; 1083 1084 badtlv: 1085 return -3; 1086 } 1087 1088 static int 1089 decode_labeled_prefix6(netdissect_options *ndo, 1090 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 1091 { 1092 struct in6_addr addr; 1093 u_int plen, plenbytes; 1094 1095 /* prefix length and label = 4 bytes */ 1096 ND_TCHECK2(pptr[0], 4); 1097 ITEMCHECK(4); 1098 plen = pptr[0]; /* get prefix length */ 1099 1100 if (24 > plen) 1101 return -1; 1102 1103 plen-=24; /* adjust prefixlen - labellength */ 1104 1105 if (128 < plen) 1106 return -1; 1107 itemlen -= 4; 1108 1109 memset(&addr, 0, sizeof(addr)); 1110 plenbytes = (plen + 7) / 8; 1111 ND_TCHECK2(pptr[4], plenbytes); 1112 memcpy(&addr, &pptr[4], plenbytes); 1113 if (plen % 8) { 1114 addr.s6_addr[plenbytes - 1] &= 1115 ((0xff00 >> (plen % 8)) & 0xff); 1116 } 1117 /* the label may get offsetted by 4 bits so lets shift it right */ 1118 snprintf(buf, buflen, "%s/%d, label:%u %s", 1119 getname6(ndo, (u_char *)&addr), 1120 plen, 1121 EXTRACT_24BITS(pptr+1)>>4, 1122 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1123 1124 return 4 + plenbytes; 1125 1126 trunc: 1127 return -2; 1128 1129 badtlv: 1130 return -3; 1131 } 1132 1133 static int 1134 decode_labeled_vpn_prefix6(netdissect_options *ndo, 1135 const u_char *pptr, char *buf, u_int buflen) 1136 { 1137 struct in6_addr addr; 1138 u_int plen; 1139 1140 ND_TCHECK(pptr[0]); 1141 plen = pptr[0]; /* get prefix length */ 1142 1143 if ((24+64) > plen) 1144 return -1; 1145 1146 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1147 1148 if (128 < plen) 1149 return -1; 1150 1151 memset(&addr, 0, sizeof(addr)); 1152 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1153 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1154 if (plen % 8) { 1155 addr.s6_addr[(plen + 7) / 8 - 1] &= 1156 ((0xff00 >> (plen % 8)) & 0xff); 1157 } 1158 /* the label may get offsetted by 4 bits so lets shift it right */ 1159 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1160 bgp_vpn_rd_print(ndo, pptr+4), 1161 getname6(ndo, (u_char *)&addr), 1162 plen, 1163 EXTRACT_24BITS(pptr+1)>>4, 1164 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1165 1166 return 12 + (plen + 7) / 8; 1167 1168 trunc: 1169 return -2; 1170 } 1171 #endif 1172 1173 static int 1174 decode_clnp_prefix(netdissect_options *ndo, 1175 const u_char *pptr, char *buf, u_int buflen) 1176 { 1177 uint8_t addr[19]; 1178 u_int plen; 1179 1180 ND_TCHECK(pptr[0]); 1181 plen = pptr[0]; /* get prefix length */ 1182 1183 if (152 < plen) 1184 return -1; 1185 1186 memset(&addr, 0, sizeof(addr)); 1187 ND_TCHECK2(pptr[4], (plen + 7) / 8); 1188 memcpy(&addr, &pptr[4], (plen + 7) / 8); 1189 if (plen % 8) { 1190 addr[(plen + 7) / 8 - 1] &= 1191 ((0xff00 >> (plen % 8)) & 0xff); 1192 } 1193 snprintf(buf, buflen, "%s/%d", 1194 isonsap_string(addr,(plen + 7) / 8), 1195 plen); 1196 1197 return 1 + (plen + 7) / 8; 1198 1199 trunc: 1200 return -2; 1201 } 1202 1203 static int 1204 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo, 1205 const u_char *pptr, char *buf, u_int buflen) 1206 { 1207 uint8_t addr[19]; 1208 u_int plen; 1209 1210 ND_TCHECK(pptr[0]); 1211 plen = pptr[0]; /* get prefix length */ 1212 1213 if ((24+64) > plen) 1214 return -1; 1215 1216 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1217 1218 if (152 < plen) 1219 return -1; 1220 1221 memset(&addr, 0, sizeof(addr)); 1222 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1223 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1224 if (plen % 8) { 1225 addr[(plen + 7) / 8 - 1] &= 1226 ((0xff00 >> (plen % 8)) & 0xff); 1227 } 1228 /* the label may get offsetted by 4 bits so lets shift it right */ 1229 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1230 bgp_vpn_rd_print(ndo, pptr+4), 1231 isonsap_string(addr,(plen + 7) / 8), 1232 plen, 1233 EXTRACT_24BITS(pptr+1)>>4, 1234 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1235 1236 return 12 + (plen + 7) / 8; 1237 1238 trunc: 1239 return -2; 1240 } 1241 1242 /* 1243 * bgp_attr_get_as_size 1244 * 1245 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as 1246 * both Old speakers that do not support 4 byte AS, and the new speakers that do 1247 * support, exchange AS-Path with the same path-attribute type value 0x02. 1248 */ 1249 static int 1250 bgp_attr_get_as_size(netdissect_options *ndo, 1251 uint8_t bgpa_type, const u_char *pptr, int len) 1252 { 1253 const u_char *tptr = pptr; 1254 1255 /* 1256 * If the path attribute is the optional AS4 path type, then we already 1257 * know, that ASs must be encoded in 4 byte format. 1258 */ 1259 if (bgpa_type == BGPTYPE_AS4_PATH) { 1260 return 4; 1261 } 1262 1263 /* 1264 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path 1265 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes 1266 * each. 1267 */ 1268 while (tptr < pptr + len) { 1269 ND_TCHECK(tptr[0]); 1270 1271 /* 1272 * If we do not find a valid segment type, our guess might be wrong. 1273 */ 1274 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) { 1275 goto trunc; 1276 } 1277 ND_TCHECK(tptr[1]); 1278 tptr += 2 + tptr[1] * 2; 1279 } 1280 1281 /* 1282 * If we correctly reached end of the AS path attribute data content, 1283 * then most likely ASs were indeed encoded as 2 bytes. 1284 */ 1285 if (tptr == pptr + len) { 1286 return 2; 1287 } 1288 1289 trunc: 1290 1291 /* 1292 * We can come here, either we did not have enough data, or if we 1293 * try to decode 4 byte ASs in 2 byte format. Either way, return 4, 1294 * so that calller can try to decode each AS as of 4 bytes. If indeed 1295 * there was not enough data, it will crib and end the parse anyways. 1296 */ 1297 return 4; 1298 } 1299 1300 static int 1301 bgp_attr_print(netdissect_options *ndo, 1302 u_int atype, const u_char *pptr, u_int len) 1303 { 1304 int i; 1305 uint16_t af; 1306 uint8_t safi, snpa, nhlen; 1307 union { /* copy buffer for bandwidth values */ 1308 float f; 1309 uint32_t i; 1310 } bw; 1311 int advance; 1312 u_int tlen; 1313 const u_char *tptr; 1314 char buf[MAXHOSTNAMELEN + 100]; 1315 char tokbuf[TOKBUFSIZE]; 1316 int as_size; 1317 1318 tptr = pptr; 1319 tlen=len; 1320 1321 switch (atype) { 1322 case BGPTYPE_ORIGIN: 1323 if (len != 1) 1324 ND_PRINT((ndo, "invalid len")); 1325 else { 1326 ND_TCHECK(*tptr); 1327 ND_PRINT((ndo, "%s", tok2strbuf(bgp_origin_values, 1328 "Unknown Origin Typecode", 1329 tptr[0], 1330 tokbuf, sizeof(tokbuf)))); 1331 } 1332 break; 1333 1334 1335 /* 1336 * Process AS4 byte path and AS2 byte path attributes here. 1337 */ 1338 case BGPTYPE_AS4_PATH: 1339 case BGPTYPE_AS_PATH: 1340 if (len % 2) { 1341 ND_PRINT((ndo, "invalid len")); 1342 break; 1343 } 1344 if (!len) { 1345 ND_PRINT((ndo, "empty")); 1346 break; 1347 } 1348 1349 /* 1350 * BGP updates exchanged between New speakers that support 4 1351 * byte AS, ASs are always encoded in 4 bytes. There is no 1352 * definitive way to find this, just by the packet's 1353 * contents. So, check for packet's TLV's sanity assuming 1354 * 2 bytes first, and it does not pass, assume that ASs are 1355 * encoded in 4 bytes format and move on. 1356 */ 1357 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); 1358 1359 while (tptr < pptr + len) { 1360 ND_TCHECK(tptr[0]); 1361 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_open_values, 1362 "?", tptr[0], 1363 tokbuf, sizeof(tokbuf)))); 1364 for (i = 0; i < tptr[1] * as_size; i += as_size) { 1365 ND_TCHECK2(tptr[2 + i], as_size); 1366 ND_PRINT((ndo, "%s ", 1367 as_printf(ndo, astostr, sizeof(astostr), 1368 as_size == 2 ? 1369 EXTRACT_16BITS(&tptr[2 + i]) : 1370 EXTRACT_32BITS(&tptr[2 + i])))); 1371 } 1372 ND_TCHECK(tptr[0]); 1373 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_close_values, 1374 "?", tptr[0], 1375 tokbuf, sizeof(tokbuf)))); 1376 ND_TCHECK(tptr[1]); 1377 tptr += 2 + tptr[1] * as_size; 1378 } 1379 break; 1380 case BGPTYPE_NEXT_HOP: 1381 if (len != 4) 1382 ND_PRINT((ndo, "invalid len")); 1383 else { 1384 ND_TCHECK2(tptr[0], 4); 1385 ND_PRINT((ndo, "%s", getname(ndo, tptr))); 1386 } 1387 break; 1388 case BGPTYPE_MULTI_EXIT_DISC: 1389 case BGPTYPE_LOCAL_PREF: 1390 if (len != 4) 1391 ND_PRINT((ndo, "invalid len")); 1392 else { 1393 ND_TCHECK2(tptr[0], 4); 1394 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr))); 1395 } 1396 break; 1397 case BGPTYPE_ATOMIC_AGGREGATE: 1398 if (len != 0) 1399 ND_PRINT((ndo, "invalid len")); 1400 break; 1401 case BGPTYPE_AGGREGATOR: 1402 1403 /* 1404 * Depending on the AS encoded is of 2 bytes or of 4 bytes, 1405 * the length of this PA can be either 6 bytes or 8 bytes. 1406 */ 1407 if (len != 6 && len != 8) { 1408 ND_PRINT((ndo, "invalid len")); 1409 break; 1410 } 1411 ND_TCHECK2(tptr[0], len); 1412 if (len == 6) { 1413 ND_PRINT((ndo, " AS #%s, origin %s", 1414 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)), 1415 getname(ndo, tptr + 2))); 1416 } else { 1417 ND_PRINT((ndo, " AS #%s, origin %s", 1418 as_printf(ndo, astostr, sizeof(astostr), 1419 EXTRACT_32BITS(tptr)), getname(ndo, tptr + 4))); 1420 } 1421 break; 1422 case BGPTYPE_AGGREGATOR4: 1423 if (len != 8) { 1424 ND_PRINT((ndo, "invalid len")); 1425 break; 1426 } 1427 ND_TCHECK2(tptr[0], 8); 1428 ND_PRINT((ndo, " AS #%s, origin %s", 1429 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)), 1430 getname(ndo, tptr + 4))); 1431 break; 1432 case BGPTYPE_COMMUNITIES: 1433 if (len % 4) { 1434 ND_PRINT((ndo, "invalid len")); 1435 break; 1436 } 1437 while (tlen>0) { 1438 uint32_t comm; 1439 ND_TCHECK2(tptr[0], 4); 1440 comm = EXTRACT_32BITS(tptr); 1441 switch (comm) { 1442 case BGP_COMMUNITY_NO_EXPORT: 1443 ND_PRINT((ndo, " NO_EXPORT")); 1444 break; 1445 case BGP_COMMUNITY_NO_ADVERT: 1446 ND_PRINT((ndo, " NO_ADVERTISE")); 1447 break; 1448 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: 1449 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED")); 1450 break; 1451 default: 1452 ND_PRINT((ndo, "%u:%u%s", 1453 (comm >> 16) & 0xffff, 1454 comm & 0xffff, 1455 (tlen>4) ? ", " : "")); 1456 break; 1457 } 1458 tlen -=4; 1459 tptr +=4; 1460 } 1461 break; 1462 case BGPTYPE_ORIGINATOR_ID: 1463 if (len != 4) { 1464 ND_PRINT((ndo, "invalid len")); 1465 break; 1466 } 1467 ND_TCHECK2(tptr[0], 4); 1468 ND_PRINT((ndo, "%s",getname(ndo, tptr))); 1469 break; 1470 case BGPTYPE_CLUSTER_LIST: 1471 if (len % 4) { 1472 ND_PRINT((ndo, "invalid len")); 1473 break; 1474 } 1475 while (tlen>0) { 1476 ND_TCHECK2(tptr[0], 4); 1477 ND_PRINT((ndo, "%s%s", 1478 getname(ndo, tptr), 1479 (tlen>4) ? ", " : "")); 1480 tlen -=4; 1481 tptr +=4; 1482 } 1483 break; 1484 case BGPTYPE_MP_REACH_NLRI: 1485 ND_TCHECK2(tptr[0], 3); 1486 af = EXTRACT_16BITS(tptr); 1487 safi = tptr[2]; 1488 1489 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1490 tok2strbuf(af_values, "Unknown AFI", af, 1491 tokbuf, sizeof(tokbuf)), 1492 af, 1493 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1494 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi, 1495 tokbuf, sizeof(tokbuf)), 1496 safi)); 1497 1498 switch(af<<8 | safi) { 1499 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1500 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1501 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1502 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1503 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1504 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1505 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1506 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1507 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1508 case (AFNUM_INET<<8 | SAFNUM_MDT): 1509 #ifdef INET6 1510 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1511 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1512 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1513 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1514 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1515 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1516 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1517 #endif 1518 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1519 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1520 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1521 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1522 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1523 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1524 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1525 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1526 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1527 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1528 break; 1529 default: 1530 ND_TCHECK2(tptr[0], tlen); 1531 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1532 if (ndo->ndo_vflag <= 1) 1533 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1534 goto done; 1535 break; 1536 } 1537 1538 tptr +=3; 1539 1540 ND_TCHECK(tptr[0]); 1541 nhlen = tptr[0]; 1542 tlen = nhlen; 1543 tptr++; 1544 1545 if (tlen) { 1546 int nnh = 0; 1547 ND_PRINT((ndo, "\n\t nexthop: ")); 1548 while (tlen > 0) { 1549 if ( nnh++ > 0 ) { 1550 ND_PRINT((ndo, ", " )); 1551 } 1552 switch(af<<8 | safi) { 1553 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1554 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1555 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1556 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1557 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1558 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1559 case (AFNUM_INET<<8 | SAFNUM_MDT): 1560 if (tlen < (int)sizeof(struct in_addr)) { 1561 ND_PRINT((ndo, "invalid len")); 1562 tlen = 0; 1563 } else { 1564 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1565 ND_PRINT((ndo, "%s",getname(ndo, tptr))); 1566 tlen -= sizeof(struct in_addr); 1567 tptr += sizeof(struct in_addr); 1568 } 1569 break; 1570 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1571 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1572 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1573 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { 1574 ND_PRINT((ndo, "invalid len")); 1575 tlen = 0; 1576 } else { 1577 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1578 ND_PRINT((ndo, "RD: %s, %s", 1579 bgp_vpn_rd_print(ndo, tptr), 1580 getname(ndo, tptr+BGP_VPN_RD_LEN))); 1581 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1582 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1583 } 1584 break; 1585 #ifdef INET6 1586 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1587 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1588 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1589 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1590 if (tlen < (int)sizeof(struct in6_addr)) { 1591 ND_PRINT((ndo, "invalid len")); 1592 tlen = 0; 1593 } else { 1594 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)); 1595 ND_PRINT((ndo, "%s", getname6(ndo, tptr))); 1596 tlen -= sizeof(struct in6_addr); 1597 tptr += sizeof(struct in6_addr); 1598 } 1599 break; 1600 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1601 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1602 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1603 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { 1604 ND_PRINT((ndo, "invalid len")); 1605 tlen = 0; 1606 } else { 1607 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1608 ND_PRINT((ndo, "RD: %s, %s", 1609 bgp_vpn_rd_print(ndo, tptr), 1610 getname6(ndo, tptr+BGP_VPN_RD_LEN))); 1611 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1612 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1613 } 1614 break; 1615 #endif 1616 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1617 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1618 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1619 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1620 if (tlen < (int)sizeof(struct in_addr)) { 1621 ND_PRINT((ndo, "invalid len")); 1622 tlen = 0; 1623 } else { 1624 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1625 ND_PRINT((ndo, "%s", getname(ndo, tptr))); 1626 tlen -= (sizeof(struct in_addr)); 1627 tptr += (sizeof(struct in_addr)); 1628 } 1629 break; 1630 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1631 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1632 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1633 ND_TCHECK2(tptr[0], tlen); 1634 ND_PRINT((ndo, "%s", isonsap_string(tptr, tlen))); 1635 tptr += tlen; 1636 tlen = 0; 1637 break; 1638 1639 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1640 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1641 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1642 if (tlen < BGP_VPN_RD_LEN+1) { 1643 ND_PRINT((ndo, "invalid len")); 1644 tlen = 0; 1645 } else { 1646 ND_TCHECK2(tptr[0], tlen); 1647 ND_PRINT((ndo, "RD: %s, %s", 1648 bgp_vpn_rd_print(ndo, tptr), 1649 isonsap_string(tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN))); 1650 /* rfc986 mapped IPv4 address ? */ 1651 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601) 1652 ND_PRINT((ndo, " = %s", getname(ndo, tptr+BGP_VPN_RD_LEN+4))); 1653 #ifdef INET6 1654 /* rfc1888 mapped IPv6 address ? */ 1655 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000) 1656 ND_PRINT((ndo, " = %s", getname6(ndo, tptr+BGP_VPN_RD_LEN+3))); 1657 #endif 1658 tptr += tlen; 1659 tlen = 0; 1660 } 1661 break; 1662 default: 1663 ND_TCHECK2(tptr[0], tlen); 1664 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi)); 1665 if (ndo->ndo_vflag <= 1) 1666 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1667 tptr += tlen; 1668 tlen = 0; 1669 goto done; 1670 break; 1671 } 1672 } 1673 } 1674 ND_PRINT((ndo, ", nh-length: %u", nhlen)); 1675 tptr += tlen; 1676 1677 ND_TCHECK(tptr[0]); 1678 snpa = tptr[0]; 1679 tptr++; 1680 1681 if (snpa) { 1682 ND_PRINT((ndo, "\n\t %u SNPA", snpa)); 1683 for (/*nothing*/; snpa > 0; snpa--) { 1684 ND_TCHECK(tptr[0]); 1685 ND_PRINT((ndo, "\n\t %d bytes", tptr[0])); 1686 tptr += tptr[0] + 1; 1687 } 1688 } else { 1689 ND_PRINT((ndo, ", no SNPA")); 1690 } 1691 1692 while (len - (tptr - pptr) > 0) { 1693 switch (af<<8 | safi) { 1694 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1695 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1696 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1697 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1698 if (advance == -1) 1699 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1700 else if (advance == -2) 1701 goto trunc; 1702 else if (advance == -3) 1703 break; /* bytes left, but not enough */ 1704 else 1705 ND_PRINT((ndo, "\n\t %s", buf)); 1706 break; 1707 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1708 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1709 if (advance == -1) 1710 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1711 else if (advance == -2) 1712 goto trunc; 1713 else if (advance == -3) 1714 break; /* bytes left, but not enough */ 1715 else 1716 ND_PRINT((ndo, "\n\t %s", buf)); 1717 break; 1718 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1719 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1720 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1721 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1722 if (advance == -1) 1723 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1724 else if (advance == -2) 1725 goto trunc; 1726 else 1727 ND_PRINT((ndo, "\n\t %s", buf)); 1728 break; 1729 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1730 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf)); 1731 if (advance == -1) 1732 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1733 else if (advance == -2) 1734 goto trunc; 1735 else 1736 ND_PRINT((ndo, "\n\t %s", buf)); 1737 break; 1738 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1739 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1740 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 1741 if (advance == -1) 1742 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1743 else if (advance == -2) 1744 goto trunc; 1745 else 1746 ND_PRINT((ndo, "\n\t %s", buf)); 1747 break; 1748 1749 case (AFNUM_INET<<8 | SAFNUM_MDT): 1750 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 1751 if (advance == -1) 1752 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1753 else if (advance == -2) 1754 goto trunc; 1755 else 1756 ND_PRINT((ndo, "\n\t %s", buf)); 1757 break; 1758 #ifdef INET6 1759 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1760 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1761 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1762 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1763 if (advance == -1) 1764 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1765 else if (advance == -2) 1766 goto trunc; 1767 else if (advance == -3) 1768 break; /* bytes left, but not enough */ 1769 else 1770 ND_PRINT((ndo, "\n\t %s", buf)); 1771 break; 1772 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1773 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1774 if (advance == -1) 1775 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1776 else if (advance == -2) 1777 goto trunc; 1778 else if (advance == -3) 1779 break; /* bytes left, but not enough */ 1780 else 1781 ND_PRINT((ndo, "\n\t %s", buf)); 1782 break; 1783 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1784 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1785 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1786 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1787 if (advance == -1) 1788 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1789 else if (advance == -2) 1790 goto trunc; 1791 else 1792 ND_PRINT((ndo, "\n\t %s", buf)); 1793 break; 1794 #endif 1795 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1796 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1797 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1798 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1799 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1800 if (advance == -1) 1801 ND_PRINT((ndo, "\n\t (illegal length)")); 1802 else if (advance == -2) 1803 goto trunc; 1804 else 1805 ND_PRINT((ndo, "\n\t %s", buf)); 1806 break; 1807 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1808 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1809 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1810 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1811 if (advance == -1) 1812 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1813 else if (advance == -2) 1814 goto trunc; 1815 else 1816 ND_PRINT((ndo, "\n\t %s", buf)); 1817 break; 1818 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1819 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1820 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1821 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1822 if (advance == -1) 1823 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1824 else if (advance == -2) 1825 goto trunc; 1826 else 1827 ND_PRINT((ndo, "\n\t %s", buf)); 1828 break; 1829 default: 1830 ND_TCHECK2(*tptr,tlen); 1831 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1832 if (ndo->ndo_vflag <= 1) 1833 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1834 advance = 0; 1835 tptr = pptr + len; 1836 break; 1837 } 1838 if (advance < 0) 1839 break; 1840 tptr += advance; 1841 } 1842 done: 1843 break; 1844 1845 case BGPTYPE_MP_UNREACH_NLRI: 1846 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE); 1847 af = EXTRACT_16BITS(tptr); 1848 safi = tptr[2]; 1849 1850 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1851 tok2strbuf(af_values, "Unknown AFI", af, 1852 tokbuf, sizeof(tokbuf)), 1853 af, 1854 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1855 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi, 1856 tokbuf, sizeof(tokbuf)), 1857 safi)); 1858 1859 if (len == BGP_MP_NLRI_MINSIZE) 1860 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 1861 1862 tptr += 3; 1863 1864 while (len - (tptr - pptr) > 0) { 1865 switch (af<<8 | safi) { 1866 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1867 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1868 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1869 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1870 if (advance == -1) 1871 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1872 else if (advance == -2) 1873 goto trunc; 1874 else if (advance == -3) 1875 break; /* bytes left, but not enough */ 1876 else 1877 ND_PRINT((ndo, "\n\t %s", buf)); 1878 break; 1879 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1880 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1881 if (advance == -1) 1882 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1883 else if (advance == -2) 1884 goto trunc; 1885 else if (advance == -3) 1886 break; /* bytes left, but not enough */ 1887 else 1888 ND_PRINT((ndo, "\n\t %s", buf)); 1889 break; 1890 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1891 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1892 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1893 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1894 if (advance == -1) 1895 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1896 else if (advance == -2) 1897 goto trunc; 1898 else 1899 ND_PRINT((ndo, "\n\t %s", buf)); 1900 break; 1901 #ifdef INET6 1902 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1903 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1904 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1905 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1906 if (advance == -1) 1907 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1908 else if (advance == -2) 1909 goto trunc; 1910 else if (advance == -3) 1911 break; /* bytes left, but not enough */ 1912 else 1913 ND_PRINT((ndo, "\n\t %s", buf)); 1914 break; 1915 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1916 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1917 if (advance == -1) 1918 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1919 else if (advance == -2) 1920 goto trunc; 1921 else if (advance == -3) 1922 break; /* bytes left, but not enough */ 1923 else 1924 ND_PRINT((ndo, "\n\t %s", buf)); 1925 break; 1926 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1927 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1928 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1929 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1930 if (advance == -1) 1931 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1932 else if (advance == -2) 1933 goto trunc; 1934 else 1935 ND_PRINT((ndo, "\n\t %s", buf)); 1936 break; 1937 #endif 1938 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1939 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1940 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1941 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1942 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1943 if (advance == -1) 1944 ND_PRINT((ndo, "\n\t (illegal length)")); 1945 else if (advance == -2) 1946 goto trunc; 1947 else 1948 ND_PRINT((ndo, "\n\t %s", buf)); 1949 break; 1950 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1951 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1952 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1953 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1954 if (advance == -1) 1955 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1956 else if (advance == -2) 1957 goto trunc; 1958 else 1959 ND_PRINT((ndo, "\n\t %s", buf)); 1960 break; 1961 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1962 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1963 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1964 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1965 if (advance == -1) 1966 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1967 else if (advance == -2) 1968 goto trunc; 1969 else 1970 ND_PRINT((ndo, "\n\t %s", buf)); 1971 break; 1972 case (AFNUM_INET<<8 | SAFNUM_MDT): 1973 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 1974 if (advance == -1) 1975 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1976 else if (advance == -2) 1977 goto trunc; 1978 else 1979 ND_PRINT((ndo, "\n\t %s", buf)); 1980 break; 1981 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1982 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1983 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 1984 if (advance == -1) 1985 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1986 else if (advance == -2) 1987 goto trunc; 1988 else 1989 ND_PRINT((ndo, "\n\t %s", buf)); 1990 break; 1991 default: 1992 ND_TCHECK2(*(tptr-3),tlen); 1993 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi)); 1994 if (ndo->ndo_vflag <= 1) 1995 print_unknown_data(ndo, tptr-3, "\n\t ", tlen); 1996 advance = 0; 1997 tptr = pptr + len; 1998 break; 1999 } 2000 if (advance < 0) 2001 break; 2002 tptr += advance; 2003 } 2004 break; 2005 case BGPTYPE_EXTD_COMMUNITIES: 2006 if (len % 8) { 2007 ND_PRINT((ndo, "invalid len")); 2008 break; 2009 } 2010 while (tlen>0) { 2011 uint16_t extd_comm; 2012 2013 ND_TCHECK2(tptr[0], 2); 2014 extd_comm=EXTRACT_16BITS(tptr); 2015 2016 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]", 2017 tok2strbuf(bgp_extd_comm_subtype_values, 2018 "unknown extd community typecode", 2019 extd_comm, tokbuf, sizeof(tokbuf)), 2020 extd_comm, 2021 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm))); 2022 2023 ND_TCHECK2(*(tptr+2), 6); 2024 switch(extd_comm) { 2025 case BGP_EXT_COM_RT_0: 2026 case BGP_EXT_COM_RO_0: 2027 case BGP_EXT_COM_L2VPN_RT_0: 2028 ND_PRINT((ndo, ": %u:%u (= %s)", 2029 EXTRACT_16BITS(tptr+2), 2030 EXTRACT_32BITS(tptr+4), 2031 getname(ndo, tptr+4))); 2032 break; 2033 case BGP_EXT_COM_RT_1: 2034 case BGP_EXT_COM_RO_1: 2035 case BGP_EXT_COM_L2VPN_RT_1: 2036 case BGP_EXT_COM_VRF_RT_IMP: 2037 ND_PRINT((ndo, ": %s:%u", 2038 getname(ndo, tptr+2), 2039 EXTRACT_16BITS(tptr+6))); 2040 break; 2041 case BGP_EXT_COM_RT_2: 2042 case BGP_EXT_COM_RO_2: 2043 ND_PRINT((ndo, ": %s:%u", 2044 as_printf(ndo, astostr, sizeof(astostr), 2045 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6))); 2046 break; 2047 case BGP_EXT_COM_LINKBAND: 2048 bw.i = EXTRACT_32BITS(tptr+2); 2049 ND_PRINT((ndo, ": bandwidth: %.3f Mbps", 2050 bw.f*8/1000000)); 2051 break; 2052 case BGP_EXT_COM_VPN_ORIGIN: 2053 case BGP_EXT_COM_VPN_ORIGIN2: 2054 case BGP_EXT_COM_VPN_ORIGIN3: 2055 case BGP_EXT_COM_VPN_ORIGIN4: 2056 case BGP_EXT_COM_OSPF_RID: 2057 case BGP_EXT_COM_OSPF_RID2: 2058 ND_PRINT((ndo, "%s", getname(ndo, tptr+2))); 2059 break; 2060 case BGP_EXT_COM_OSPF_RTYPE: 2061 case BGP_EXT_COM_OSPF_RTYPE2: 2062 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s", 2063 getname(ndo, tptr+2), 2064 tok2strbuf(bgp_extd_comm_ospf_rtype_values, 2065 "unknown (0x%02x)", 2066 *(tptr+6), 2067 tokbuf, sizeof(tokbuf)), 2068 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", 2069 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "")); 2070 break; 2071 case BGP_EXT_COM_L2INFO: 2072 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u", 2073 tok2strbuf(l2vpn_encaps_values, 2074 "unknown encaps", 2075 *(tptr+2), 2076 tokbuf, sizeof(tokbuf)), 2077 *(tptr+3), 2078 EXTRACT_16BITS(tptr+4))); 2079 break; 2080 case BGP_EXT_COM_SOURCE_AS: 2081 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2))); 2082 break; 2083 default: 2084 ND_TCHECK2(*tptr,8); 2085 print_unknown_data(ndo, tptr, "\n\t ", 8); 2086 break; 2087 } 2088 tlen -=8; 2089 tptr +=8; 2090 } 2091 break; 2092 2093 case BGPTYPE_PMSI_TUNNEL: 2094 { 2095 uint8_t tunnel_type, flags; 2096 2097 tunnel_type = *(tptr+1); 2098 flags = *tptr; 2099 tlen = len; 2100 2101 ND_TCHECK2(tptr[0], 5); 2102 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", 2103 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), 2104 tunnel_type, 2105 bittok2str(bgp_pmsi_flag_values, "none", flags), 2106 EXTRACT_24BITS(tptr+2)>>4)); 2107 2108 tptr +=5; 2109 tlen -= 5; 2110 2111 switch (tunnel_type) { 2112 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ 2113 case BGP_PMSI_TUNNEL_PIM_BIDIR: 2114 ND_TCHECK2(tptr[0], 8); 2115 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s", 2116 ipaddr_string(ndo, tptr), 2117 ipaddr_string(ndo, tptr+4))); 2118 break; 2119 2120 case BGP_PMSI_TUNNEL_PIM_SSM: 2121 ND_TCHECK2(tptr[0], 8); 2122 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s", 2123 ipaddr_string(ndo, tptr), 2124 ipaddr_string(ndo, tptr+4))); 2125 break; 2126 case BGP_PMSI_TUNNEL_INGRESS: 2127 ND_TCHECK2(tptr[0], 4); 2128 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s", 2129 ipaddr_string(ndo, tptr))); 2130 break; 2131 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ 2132 case BGP_PMSI_TUNNEL_LDP_MP2MP: 2133 ND_TCHECK2(tptr[0], 8); 2134 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x", 2135 ipaddr_string(ndo, tptr), 2136 EXTRACT_32BITS(tptr+4))); 2137 break; 2138 case BGP_PMSI_TUNNEL_RSVP_P2MP: 2139 ND_TCHECK2(tptr[0], 8); 2140 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", 2141 ipaddr_string(ndo, tptr), 2142 EXTRACT_32BITS(tptr+4))); 2143 break; 2144 default: 2145 if (ndo->ndo_vflag <= 1) { 2146 print_unknown_data(ndo, tptr, "\n\t ", tlen); 2147 } 2148 } 2149 break; 2150 } 2151 case BGPTYPE_ATTR_SET: 2152 ND_TCHECK2(tptr[0], 4); 2153 if (len < 4) 2154 goto trunc; 2155 ND_PRINT((ndo, "\n\t Origin AS: %s", 2156 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)))); 2157 tptr+=4; 2158 len -=4; 2159 2160 while (len) { 2161 u_int aflags, atype, alenlen, alen; 2162 2163 ND_TCHECK2(tptr[0], 2); 2164 if (len < 2) 2165 goto trunc; 2166 aflags = *tptr; 2167 atype = *(tptr + 1); 2168 tptr += 2; 2169 len -= 2; 2170 alenlen = bgp_attr_lenlen(aflags, tptr); 2171 ND_TCHECK2(tptr[0], alenlen); 2172 if (len < alenlen) 2173 goto trunc; 2174 alen = bgp_attr_len(aflags, tptr); 2175 tptr += alenlen; 2176 len -= alenlen; 2177 2178 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2179 tok2strbuf(bgp_attr_values, 2180 "Unknown Attribute", atype, 2181 tokbuf, sizeof(tokbuf)), 2182 atype, 2183 alen)); 2184 2185 if (aflags) { 2186 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2187 aflags & 0x80 ? "O" : "", 2188 aflags & 0x40 ? "T" : "", 2189 aflags & 0x20 ? "P" : "", 2190 aflags & 0x10 ? "E" : "")); 2191 if (aflags & 0xf) 2192 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2193 ND_PRINT((ndo, "]: ")); 2194 } 2195 /* FIXME check for recursion */ 2196 if (!bgp_attr_print(ndo, atype, tptr, alen)) 2197 return 0; 2198 tptr += alen; 2199 len -= alen; 2200 } 2201 break; 2202 2203 2204 default: 2205 ND_TCHECK2(*pptr,len); 2206 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */ 2207 if (ndo->ndo_vflag <= 1) 2208 print_unknown_data(ndo, pptr, "\n\t ", len); 2209 break; 2210 } 2211 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/ 2212 ND_TCHECK2(*pptr,len); 2213 print_unknown_data(ndo, pptr, "\n\t ", len); 2214 } 2215 return 1; 2216 2217 trunc: 2218 return 0; 2219 } 2220 2221 static void 2222 bgp_capabilities_print(netdissect_options *ndo, 2223 const u_char *opt, int caps_len) 2224 { 2225 char tokbuf[TOKBUFSIZE]; 2226 char tokbuf2[TOKBUFSIZE]; 2227 int cap_type, cap_len, tcap_len, cap_offset; 2228 int i = 0; 2229 2230 while (i < caps_len) { 2231 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE); 2232 cap_type=opt[i]; 2233 cap_len=opt[i+1]; 2234 tcap_len=cap_len; 2235 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2236 tok2strbuf(bgp_capcode_values, "Unknown", 2237 cap_type, tokbuf, sizeof(tokbuf)), 2238 cap_type, 2239 cap_len)); 2240 ND_TCHECK2(opt[i+2], cap_len); 2241 switch (cap_type) { 2242 case BGP_CAPCODE_MP: 2243 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)", 2244 tok2strbuf(af_values, "Unknown", 2245 EXTRACT_16BITS(opt+i+2), 2246 tokbuf, sizeof(tokbuf)), 2247 EXTRACT_16BITS(opt+i+2), 2248 tok2strbuf(bgp_safi_values, "Unknown", 2249 opt[i+5], 2250 tokbuf, sizeof(tokbuf)), 2251 opt[i+5])); 2252 break; 2253 case BGP_CAPCODE_RESTART: 2254 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us", 2255 ((opt[i+2])&0x80) ? "R" : "none", 2256 EXTRACT_16BITS(opt+i+2)&0xfff)); 2257 tcap_len-=2; 2258 cap_offset=4; 2259 while(tcap_len>=4) { 2260 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", 2261 tok2strbuf(af_values,"Unknown", 2262 EXTRACT_16BITS(opt+i+cap_offset), 2263 tokbuf, sizeof(tokbuf)), 2264 EXTRACT_16BITS(opt+i+cap_offset), 2265 tok2strbuf(bgp_safi_values,"Unknown", 2266 opt[i+cap_offset+2], 2267 tokbuf2, sizeof(tokbuf2)), 2268 opt[i+cap_offset+2], 2269 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" )); 2270 tcap_len-=4; 2271 cap_offset+=4; 2272 } 2273 break; 2274 case BGP_CAPCODE_RR: 2275 case BGP_CAPCODE_RR_CISCO: 2276 break; 2277 case BGP_CAPCODE_AS_NEW: 2278 2279 /* 2280 * Extract the 4 byte AS number encoded. 2281 */ 2282 if (cap_len == 4) { 2283 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s", 2284 as_printf(ndo, astostr, sizeof(astostr), 2285 EXTRACT_32BITS(opt + i + 2)))); 2286 } 2287 break; 2288 default: 2289 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u", 2290 cap_type)); 2291 if (ndo->ndo_vflag <= 1) 2292 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2293 break; 2294 } 2295 if (ndo->ndo_vflag > 1 && cap_len > 0) { 2296 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2297 } 2298 i += BGP_CAP_HEADER_SIZE + cap_len; 2299 } 2300 return; 2301 2302 trunc: 2303 ND_PRINT((ndo, "[|BGP]")); 2304 } 2305 2306 static void 2307 bgp_open_print(netdissect_options *ndo, 2308 const u_char *dat, int length) 2309 { 2310 struct bgp_open bgpo; 2311 struct bgp_opt bgpopt; 2312 const u_char *opt; 2313 int i; 2314 char tokbuf[TOKBUFSIZE]; 2315 2316 ND_TCHECK2(dat[0], BGP_OPEN_SIZE); 2317 memcpy(&bgpo, dat, BGP_OPEN_SIZE); 2318 2319 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version)); 2320 ND_PRINT((ndo, "my AS %s, ", 2321 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas)))); 2322 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime))); 2323 ND_PRINT((ndo, "ID %s", getname(ndo, (u_char *)&bgpo.bgpo_id))); 2324 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen)); 2325 2326 /* some little sanity checking */ 2327 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) 2328 return; 2329 2330 /* ugly! */ 2331 opt = &((const struct bgp_open *)dat)->bgpo_optlen; 2332 opt++; 2333 2334 i = 0; 2335 while (i < bgpo.bgpo_optlen) { 2336 ND_TCHECK2(opt[i], BGP_OPT_SIZE); 2337 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); 2338 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { 2339 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len)); 2340 break; 2341 } 2342 2343 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u", 2344 tok2strbuf(bgp_opt_values,"Unknown", 2345 bgpopt.bgpopt_type, 2346 tokbuf, sizeof(tokbuf)), 2347 bgpopt.bgpopt_type, 2348 bgpopt.bgpopt_len)); 2349 2350 /* now let's decode the options we know*/ 2351 switch(bgpopt.bgpopt_type) { 2352 2353 case BGP_OPT_CAP: 2354 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE], 2355 bgpopt.bgpopt_len); 2356 break; 2357 2358 case BGP_OPT_AUTH: 2359 default: 2360 ND_PRINT((ndo, "\n\t no decoder for option %u", 2361 bgpopt.bgpopt_type)); 2362 break; 2363 } 2364 i += BGP_OPT_SIZE + bgpopt.bgpopt_len; 2365 } 2366 return; 2367 trunc: 2368 ND_PRINT((ndo, "[|BGP]")); 2369 } 2370 2371 static void 2372 bgp_update_print(netdissect_options *ndo, 2373 const u_char *dat, int length) 2374 { 2375 struct bgp bgp; 2376 const u_char *p; 2377 int withdrawn_routes_len; 2378 int len; 2379 int i; 2380 char tokbuf[TOKBUFSIZE]; 2381 #ifndef INET6 2382 char buf[MAXHOSTNAMELEN + 100]; 2383 int wpfx; 2384 #endif 2385 2386 ND_TCHECK2(dat[0], BGP_SIZE); 2387 if (length < BGP_SIZE) 2388 goto trunc; 2389 memcpy(&bgp, dat, BGP_SIZE); 2390 p = dat + BGP_SIZE; /*XXX*/ 2391 length -= BGP_SIZE; 2392 2393 /* Unfeasible routes */ 2394 ND_TCHECK2(p[0], 2); 2395 if (length < 2) 2396 goto trunc; 2397 withdrawn_routes_len = EXTRACT_16BITS(p); 2398 p += 2; 2399 length -= 2; 2400 if (withdrawn_routes_len) { 2401 /* 2402 * Without keeping state from the original NLRI message, 2403 * it's not possible to tell if this a v4 or v6 route, 2404 * so only try to decode it if we're not v6 enabled. 2405 */ 2406 ND_TCHECK2(p[0], withdrawn_routes_len); 2407 if (length < withdrawn_routes_len) 2408 goto trunc; 2409 #ifdef INET6 2410 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len)); 2411 p += withdrawn_routes_len; 2412 length -= withdrawn_routes_len; 2413 #else 2414 if (withdrawn_routes_len < 2) 2415 goto trunc; 2416 length -= 2; 2417 withdrawn_routes_len -= 2; 2418 2419 2420 ND_PRINT((ndo, "\n\t Withdrawn routes:")); 2421 2422 while(withdrawn_routes_len > 0) { 2423 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf)); 2424 if (wpfx == -1) { 2425 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2426 break; 2427 } else if (wpfx == -2) 2428 goto trunc; 2429 else if (wpfx == -3) 2430 goto trunc; /* bytes left, but not enough */ 2431 else { 2432 ND_PRINT((ndo, "\n\t %s", buf)); 2433 p += wpfx; 2434 length -= wpfx; 2435 withdrawn_routes_len -= wpfx; 2436 } 2437 } 2438 #endif 2439 } 2440 2441 ND_TCHECK2(p[0], 2); 2442 if (length < 2) 2443 goto trunc; 2444 len = EXTRACT_16BITS(p); 2445 p += 2; 2446 length -= 2; 2447 2448 if (withdrawn_routes_len == 0 && len == 0 && length == 0) { 2449 /* No withdrawn routes, no path attributes, no NLRI */ 2450 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 2451 return; 2452 } 2453 2454 if (len) { 2455 /* do something more useful!*/ 2456 while (len) { 2457 int aflags, atype, alenlen, alen; 2458 2459 ND_TCHECK2(p[0], 2); 2460 if (len < 2) 2461 goto trunc; 2462 if (length < 2) 2463 goto trunc; 2464 aflags = *p; 2465 atype = *(p + 1); 2466 p += 2; 2467 len -= 2; 2468 length -= 2; 2469 alenlen = bgp_attr_lenlen(aflags, p); 2470 ND_TCHECK2(p[0], alenlen); 2471 if (len < alenlen) 2472 goto trunc; 2473 if (length < alenlen) 2474 goto trunc; 2475 alen = bgp_attr_len(aflags, p); 2476 p += alenlen; 2477 len -= alenlen; 2478 length -= alenlen; 2479 2480 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2481 tok2strbuf(bgp_attr_values, "Unknown Attribute", 2482 atype, 2483 tokbuf, sizeof(tokbuf)), 2484 atype, 2485 alen)); 2486 2487 if (aflags) { 2488 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2489 aflags & 0x80 ? "O" : "", 2490 aflags & 0x40 ? "T" : "", 2491 aflags & 0x20 ? "P" : "", 2492 aflags & 0x10 ? "E" : "")); 2493 if (aflags & 0xf) 2494 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2495 ND_PRINT((ndo, "]: ")); 2496 } 2497 if (len < alen) 2498 goto trunc; 2499 if (length < alen) 2500 goto trunc; 2501 if (!bgp_attr_print(ndo, atype, p, alen)) 2502 goto trunc; 2503 p += alen; 2504 len -= alen; 2505 length -= alen; 2506 } 2507 } 2508 2509 if (length) { 2510 /* 2511 * XXX - what if they're using the "Advertisement of 2512 * Multiple Paths in BGP" feature: 2513 * 2514 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/ 2515 * 2516 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06 2517 */ 2518 ND_PRINT((ndo, "\n\t Updated routes:")); 2519 while (length) { 2520 char buf[MAXHOSTNAMELEN + 100]; 2521 i = decode_prefix4(ndo, p, length, buf, sizeof(buf)); 2522 if (i == -1) { 2523 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2524 break; 2525 } else if (i == -2) 2526 goto trunc; 2527 else if (i == -3) 2528 goto trunc; /* bytes left, but not enough */ 2529 else { 2530 ND_PRINT((ndo, "\n\t %s", buf)); 2531 p += i; 2532 length -= i; 2533 } 2534 } 2535 } 2536 return; 2537 trunc: 2538 ND_PRINT((ndo, "[|BGP]")); 2539 } 2540 2541 static void 2542 bgp_notification_print(netdissect_options *ndo, 2543 const u_char *dat, int length) 2544 { 2545 struct bgp_notification bgpn; 2546 const u_char *tptr; 2547 char tokbuf[TOKBUFSIZE]; 2548 char tokbuf2[TOKBUFSIZE]; 2549 2550 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); 2551 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); 2552 2553 /* some little sanity checking */ 2554 if (length<BGP_NOTIFICATION_SIZE) 2555 return; 2556 2557 ND_PRINT((ndo, ", %s (%u)", 2558 tok2strbuf(bgp_notify_major_values, "Unknown Error", 2559 bgpn.bgpn_major, tokbuf, sizeof(tokbuf)), 2560 bgpn.bgpn_major)); 2561 2562 switch (bgpn.bgpn_major) { 2563 2564 case BGP_NOTIFY_MAJOR_MSG: 2565 ND_PRINT((ndo, ", subcode %s (%u)", 2566 tok2strbuf(bgp_notify_minor_msg_values, "Unknown", 2567 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2568 bgpn.bgpn_minor)); 2569 break; 2570 case BGP_NOTIFY_MAJOR_OPEN: 2571 ND_PRINT((ndo, ", subcode %s (%u)", 2572 tok2strbuf(bgp_notify_minor_open_values, "Unknown", 2573 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2574 bgpn.bgpn_minor)); 2575 break; 2576 case BGP_NOTIFY_MAJOR_UPDATE: 2577 ND_PRINT((ndo, ", subcode %s (%u)", 2578 tok2strbuf(bgp_notify_minor_update_values, "Unknown", 2579 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2580 bgpn.bgpn_minor)); 2581 break; 2582 case BGP_NOTIFY_MAJOR_CAP: 2583 ND_PRINT((ndo, " subcode %s (%u)", 2584 tok2strbuf(bgp_notify_minor_cap_values, "Unknown", 2585 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2586 bgpn.bgpn_minor)); 2587 case BGP_NOTIFY_MAJOR_CEASE: 2588 ND_PRINT((ndo, ", subcode %s (%u)", 2589 tok2strbuf(bgp_notify_minor_cease_values, "Unknown", 2590 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2591 bgpn.bgpn_minor)); 2592 2593 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes 2594 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES 2595 */ 2596 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { 2597 tptr = dat + BGP_NOTIFICATION_SIZE; 2598 ND_TCHECK2(*tptr, 7); 2599 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", 2600 tok2strbuf(af_values, "Unknown", 2601 EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)), 2602 EXTRACT_16BITS(tptr), 2603 tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2), 2604 tokbuf2, sizeof(tokbuf)), 2605 *(tptr+2), 2606 EXTRACT_32BITS(tptr+3))); 2607 } 2608 break; 2609 default: 2610 break; 2611 } 2612 2613 return; 2614 trunc: 2615 ND_PRINT((ndo, "[|BGP]")); 2616 } 2617 2618 static void 2619 bgp_route_refresh_print(netdissect_options *ndo, 2620 const u_char *pptr, int len) { 2621 2622 const struct bgp_route_refresh *bgp_route_refresh_header; 2623 char tokbuf[TOKBUFSIZE]; 2624 char tokbuf2[TOKBUFSIZE]; 2625 2626 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE); 2627 2628 /* some little sanity checking */ 2629 if (len<BGP_ROUTE_REFRESH_SIZE) 2630 return; 2631 2632 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; 2633 2634 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)", 2635 tok2strbuf(af_values,"Unknown", 2636 /* this stinks but the compiler pads the structure 2637 * weird */ 2638 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2639 tokbuf, sizeof(tokbuf)), 2640 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2641 tok2strbuf(bgp_safi_values,"Unknown", 2642 bgp_route_refresh_header->safi, 2643 tokbuf2, sizeof(tokbuf2)), 2644 bgp_route_refresh_header->safi)); 2645 2646 if (ndo->ndo_vflag > 1) { 2647 ND_TCHECK2(*pptr, len); 2648 print_unknown_data(ndo, pptr, "\n\t ", len); 2649 } 2650 2651 return; 2652 trunc: 2653 ND_PRINT((ndo, "[|BGP]")); 2654 } 2655 2656 static int 2657 bgp_header_print(netdissect_options *ndo, 2658 const u_char *dat, int length) 2659 { 2660 struct bgp bgp; 2661 char tokbuf[TOKBUFSIZE]; 2662 2663 ND_TCHECK2(dat[0], BGP_SIZE); 2664 memcpy(&bgp, dat, BGP_SIZE); 2665 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u", 2666 tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type, 2667 tokbuf, sizeof(tokbuf)), 2668 bgp.bgp_type, 2669 length)); 2670 2671 switch (bgp.bgp_type) { 2672 case BGP_OPEN: 2673 bgp_open_print(ndo, dat, length); 2674 break; 2675 case BGP_UPDATE: 2676 bgp_update_print(ndo, dat, length); 2677 break; 2678 case BGP_NOTIFICATION: 2679 bgp_notification_print(ndo, dat, length); 2680 break; 2681 case BGP_KEEPALIVE: 2682 break; 2683 case BGP_ROUTE_REFRESH: 2684 bgp_route_refresh_print(ndo, dat, length); 2685 break; 2686 default: 2687 /* we have no decoder for the BGP message */ 2688 ND_TCHECK2(*dat, length); 2689 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type)); 2690 print_unknown_data(ndo, dat, "\n\t ", length); 2691 break; 2692 } 2693 return 1; 2694 trunc: 2695 ND_PRINT((ndo, "[|BGP]")); 2696 return 0; 2697 } 2698 2699 void 2700 bgp_print(netdissect_options *ndo, 2701 const u_char *dat, int length) 2702 { 2703 const u_char *p; 2704 const u_char *ep; 2705 const u_char *start; 2706 const u_char marker[] = { 2707 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2708 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2709 }; 2710 struct bgp bgp; 2711 uint16_t hlen; 2712 char tokbuf[TOKBUFSIZE]; 2713 2714 ep = dat + length; 2715 if (ndo->ndo_snapend < dat + length) 2716 ep = ndo->ndo_snapend; 2717 2718 ND_PRINT((ndo, ": BGP, length: %u", length)); 2719 2720 if (ndo->ndo_vflag < 1) /* lets be less chatty */ 2721 return; 2722 2723 p = dat; 2724 start = p; 2725 while (p < ep) { 2726 if (!ND_TTEST2(p[0], 1)) 2727 break; 2728 if (p[0] != 0xff) { 2729 p++; 2730 continue; 2731 } 2732 2733 if (!ND_TTEST2(p[0], sizeof(marker))) 2734 break; 2735 if (memcmp(p, marker, sizeof(marker)) != 0) { 2736 p++; 2737 continue; 2738 } 2739 2740 /* found BGP header */ 2741 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/ 2742 memcpy(&bgp, p, BGP_SIZE); 2743 2744 if (start != p) 2745 ND_PRINT((ndo, " [|BGP]")); 2746 2747 hlen = ntohs(bgp.bgp_len); 2748 if (hlen < BGP_SIZE) { 2749 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen, 2750 BGP_SIZE)); 2751 break; 2752 } 2753 2754 if (ND_TTEST2(p[0], hlen)) { 2755 if (!bgp_header_print(ndo, p, hlen)) 2756 return; 2757 p += hlen; 2758 start = p; 2759 } else { 2760 ND_PRINT((ndo, "\n[|BGP %s]", 2761 tok2strbuf(bgp_msg_values, 2762 "Unknown Message Type", 2763 bgp.bgp_type, 2764 tokbuf, sizeof(tokbuf)))); 2765 break; 2766 } 2767 } 2768 2769 return; 2770 2771 trunc: 2772 ND_PRINT((ndo, " [|BGP]")); 2773 } 2774 2775 /* 2776 * Local Variables: 2777 * c-style: whitesmith 2778 * c-basic-offset: 4 2779 * End: 2780 */ 2781