1 /* 2 * Copyright (C) 1999 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * Extensively modified by Hannes Gredler (hannes (at) juniper.net) for more 30 * complete BGP support. 31 */ 32 33 #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 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 { 579 580 /* worst case string is s fully formatted v6 address */ 581 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")]; 582 char *pos = addr; 583 584 switch(addr_length) { 585 case (sizeof(struct in_addr) << 3): /* 32 */ 586 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 587 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr)); 588 break; 589 #ifdef INET6 590 case (sizeof(struct in6_addr) << 3): /* 128 */ 591 ND_TCHECK2(pptr[0], sizeof(struct in6_addr)); 592 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr)); 593 break; 594 #endif 595 default: 596 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length); 597 break; 598 } 599 pos += strlen(pos); 600 601 trunc: 602 *(pos) = '\0'; 603 return (addr); 604 } 605 606 /* 607 * bgp_vpn_sg_print 608 * 609 * print an multicast s,g entry into a buffer. 610 * the s,g entry is encoded like this. 611 * 612 * +-----------------------------------+ 613 * | Multicast Source Length (1 octet) | 614 * +-----------------------------------+ 615 * | Multicast Source (Variable) | 616 * +-----------------------------------+ 617 * | Multicast Group Length (1 octet) | 618 * +-----------------------------------+ 619 * | Multicast Group (Variable) | 620 * +-----------------------------------+ 621 * 622 * return the number of bytes read from the wire. 623 */ 624 static int 625 bgp_vpn_sg_print(netdissect_options *ndo, 626 const u_char *pptr, char *buf, u_int buflen) 627 { 628 uint8_t addr_length; 629 u_int total_length, offset; 630 631 total_length = 0; 632 633 /* Source address length, encoded in bits */ 634 ND_TCHECK2(pptr[0], 1); 635 addr_length = *pptr++; 636 637 /* Source address */ 638 ND_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(ndo, pptr, addr_length)); 644 pptr += (addr_length >> 3); 645 } 646 647 /* Group address length, encoded in bits */ 648 ND_TCHECK2(pptr[0], 1); 649 addr_length = *pptr++; 650 651 /* Group address */ 652 ND_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(ndo, 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(netdissect_options *ndo, 671 const u_char *pptr) 672 { 673 /* allocate space for the largest possible string */ 674 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")]; 675 char *pos = rd; 676 677 /* ok lets load the RD format */ 678 switch (EXTRACT_16BITS(pptr)) { 679 680 /* 2-byte-AS:number fmt*/ 681 case 0: 682 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)", 683 EXTRACT_16BITS(pptr+2), 684 EXTRACT_32BITS(pptr+4), 685 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7)); 686 break; 687 /* IP-address:AS fmt*/ 688 689 case 1: 690 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u", 691 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6)); 692 break; 693 694 /* 4-byte-AS:number fmt*/ 695 case 2: 696 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)", 697 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)), 698 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4), 699 *(pptr+5), EXTRACT_16BITS(pptr+6)); 700 break; 701 default: 702 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format"); 703 break; 704 } 705 pos += strlen(pos); 706 *(pos) = '\0'; 707 return (rd); 708 } 709 710 static int 711 decode_rt_routing_info(netdissect_options *ndo, 712 const u_char *pptr, char *buf, u_int buflen) 713 { 714 uint8_t route_target[8]; 715 u_int plen; 716 717 ND_TCHECK(pptr[0]); 718 plen = pptr[0]; /* get prefix length */ 719 720 if (0 == plen) { 721 snprintf(buf, buflen, "default route target"); 722 return 1; 723 } 724 725 if (32 > plen) 726 return -1; 727 728 plen-=32; /* adjust prefix length */ 729 730 if (64 < plen) 731 return -1; 732 733 memset(&route_target, 0, sizeof(route_target)); 734 ND_TCHECK2(pptr[1], (plen + 7) / 8); 735 memcpy(&route_target, &pptr[1], (plen + 7) / 8); 736 if (plen % 8) { 737 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= 738 ((0xff00 >> (plen % 8)) & 0xff); 739 } 740 snprintf(buf, buflen, "origin AS: %s, route target %s", 741 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)), 742 bgp_vpn_rd_print(ndo, (u_char *)&route_target)); 743 744 return 5 + (plen + 7) / 8; 745 746 trunc: 747 return -2; 748 } 749 750 static int 751 decode_labeled_vpn_prefix4(netdissect_options *ndo, 752 const u_char *pptr, char *buf, u_int buflen) 753 { 754 struct in_addr addr; 755 u_int plen; 756 757 ND_TCHECK(pptr[0]); 758 plen = pptr[0]; /* get prefix length */ 759 760 if ((24+64) > plen) 761 return -1; 762 763 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 764 765 if (32 < plen) 766 return -1; 767 768 memset(&addr, 0, sizeof(addr)); 769 ND_TCHECK2(pptr[12], (plen + 7) / 8); 770 memcpy(&addr, &pptr[12], (plen + 7) / 8); 771 if (plen % 8) { 772 ((u_char *)&addr)[(plen + 7) / 8 - 1] &= 773 ((0xff00 >> (plen % 8)) & 0xff); 774 } 775 /* the label may get offsetted by 4 bits so lets shift it right */ 776 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 777 bgp_vpn_rd_print(ndo, pptr+4), 778 getname(ndo, (u_char *)&addr), 779 plen, 780 EXTRACT_24BITS(pptr+1)>>4, 781 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 782 783 return 12 + (plen + 7) / 8; 784 785 trunc: 786 return -2; 787 } 788 789 /* 790 * +-------------------------------+ 791 * | | 792 * | RD:IPv4-address (12 octets) | 793 * | | 794 * +-------------------------------+ 795 * | MDT Group-address (4 octets) | 796 * +-------------------------------+ 797 */ 798 799 #define MDT_VPN_NLRI_LEN 16 800 801 static int 802 decode_mdt_vpn_nlri(netdissect_options *ndo, 803 const u_char *pptr, char *buf, u_int buflen) 804 { 805 806 const u_char *rd; 807 const u_char *vpn_ip; 808 809 ND_TCHECK(pptr[0]); 810 811 /* if the NLRI is not predefined length, quit.*/ 812 if (*pptr != MDT_VPN_NLRI_LEN * 8) 813 return -1; 814 pptr++; 815 816 /* RD */ 817 ND_TCHECK2(pptr[0], 8); 818 rd = pptr; 819 pptr+=8; 820 821 /* IPv4 address */ 822 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 823 vpn_ip = pptr; 824 pptr+=sizeof(struct in_addr); 825 826 /* MDT Group Address */ 827 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 828 829 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s", 830 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr)); 831 832 return MDT_VPN_NLRI_LEN + 1; 833 834 trunc: 835 836 return -2; 837 } 838 839 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1 840 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2 841 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3 842 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4 843 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5 844 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6 845 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7 846 847 static const struct tok bgp_multicast_vpn_route_type_values[] = { 848 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"}, 849 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"}, 850 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"}, 851 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"}, 852 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"}, 853 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"}, 854 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"}, 855 }; 856 857 static int 858 decode_multicast_vpn(netdissect_options *ndo, 859 const u_char *pptr, char *buf, u_int buflen) 860 { 861 uint8_t route_type, route_length, addr_length, sg_length; 862 u_int offset; 863 864 ND_TCHECK2(pptr[0], 2); 865 route_type = *pptr++; 866 route_length = *pptr++; 867 868 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", 869 tok2str(bgp_multicast_vpn_route_type_values, 870 "Unknown", route_type), 871 route_type, route_length); 872 873 switch(route_type) { 874 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: 875 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 876 offset = strlen(buf); 877 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", 878 bgp_vpn_rd_print(ndo, pptr), 879 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN, 880 (route_length - BGP_VPN_RD_LEN) << 3)); 881 break; 882 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: 883 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); 884 offset = strlen(buf); 885 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 886 bgp_vpn_rd_print(ndo, pptr), 887 as_printf(ndo, astostr, sizeof(astostr), 888 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 889 break; 890 891 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: 892 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 893 offset = strlen(buf); 894 snprintf(buf + offset, buflen - offset, ", RD: %s", 895 bgp_vpn_rd_print(ndo, pptr)); 896 pptr += BGP_VPN_RD_LEN; 897 898 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen); 899 addr_length = route_length - sg_length; 900 901 ND_TCHECK2(pptr[0], addr_length); 902 offset = strlen(buf); 903 snprintf(buf + offset, buflen - offset, ", Originator %s", 904 bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); 905 break; 906 907 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: 908 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 909 offset = strlen(buf); 910 snprintf(buf + offset, buflen - offset, ", RD: %s", 911 bgp_vpn_rd_print(ndo, pptr)); 912 pptr += BGP_VPN_RD_LEN; 913 914 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 915 break; 916 917 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ 918 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: 919 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 920 offset = strlen(buf); 921 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 922 bgp_vpn_rd_print(ndo, pptr), 923 as_printf(ndo, astostr, sizeof(astostr), 924 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 925 pptr += BGP_VPN_RD_LEN; 926 927 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 928 break; 929 930 /* 931 * no per route-type printing yet. 932 */ 933 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: 934 default: 935 break; 936 } 937 938 return route_length + 2; 939 940 trunc: 941 return -2; 942 } 943 944 /* 945 * As I remember, some versions of systems have an snprintf() that 946 * returns -1 if the buffer would have overflowed. If the return 947 * value is negative, set buflen to 0, to indicate that we've filled 948 * the buffer up. 949 * 950 * If the return value is greater than buflen, that means that 951 * the buffer would have overflowed; again, set buflen to 0 in 952 * that case. 953 */ 954 #define UPDATE_BUF_BUFLEN(buf, buflen, strlen) \ 955 if (strlen<0) \ 956 buflen=0; \ 957 else if ((u_int)strlen>buflen) \ 958 buflen=0; \ 959 else { \ 960 buflen-=strlen; \ 961 buf+=strlen; \ 962 } 963 964 static int 965 decode_labeled_vpn_l2(netdissect_options *ndo, 966 const u_char *pptr, char *buf, u_int buflen) 967 { 968 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len; 969 970 ND_TCHECK2(pptr[0], 2); 971 plen=EXTRACT_16BITS(pptr); 972 tlen=plen; 973 pptr+=2; 974 /* Old and new L2VPN NLRI share AFI/SAFI 975 * -> Assume a 12 Byte-length NLRI is auto-discovery-only 976 * and > 17 as old format. Complain for the middle case 977 */ 978 if (plen==12) { 979 /* assume AD-only with RD, BGPNH */ 980 ND_TCHECK2(pptr[0],12); 981 buf[0]='\0'; 982 strlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s", 983 bgp_vpn_rd_print(ndo, pptr), 984 /* need something like getname(ndo, ) here */ 985 getname(ndo, pptr+8) 986 ); 987 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 988 pptr+=12; 989 tlen-=12; 990 return plen; 991 } else if (plen>17) { 992 /* assume old format */ 993 /* RD, ID, LBLKOFF, LBLBASE */ 994 995 ND_TCHECK2(pptr[0],15); 996 buf[0]='\0'; 997 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", 998 bgp_vpn_rd_print(ndo, pptr), 999 EXTRACT_16BITS(pptr+8), 1000 EXTRACT_16BITS(pptr+10), 1001 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ 1002 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1003 pptr+=15; 1004 tlen-=15; 1005 1006 /* ok now the variable part - lets read out TLVs*/ 1007 while (tlen>0) { 1008 if (tlen < 3) 1009 return -1; 1010 ND_TCHECK2(pptr[0], 3); 1011 tlv_type=*pptr++; 1012 tlv_len=EXTRACT_16BITS(pptr); 1013 ttlv_len=tlv_len; 1014 pptr+=2; 1015 1016 switch(tlv_type) { 1017 case 1: 1018 if (buflen!=0) { 1019 strlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", 1020 tlv_type, 1021 tlv_len); 1022 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1023 } 1024 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */ 1025 while (ttlv_len>0) { 1026 ND_TCHECK(pptr[0]); 1027 if (buflen!=0) { 1028 strlen=snprintf(buf,buflen, "%02x",*pptr++); 1029 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1030 } 1031 ttlv_len--; 1032 } 1033 break; 1034 default: 1035 if (buflen!=0) { 1036 strlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", 1037 tlv_type, 1038 tlv_len); 1039 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1040 } 1041 break; 1042 } 1043 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */ 1044 } 1045 return plen+2; 1046 1047 } else { 1048 /* complain bitterly ? */ 1049 /* fall through */ 1050 goto trunc; 1051 } 1052 1053 trunc: 1054 return -2; 1055 } 1056 1057 #ifdef INET6 1058 int 1059 decode_prefix6(netdissect_options *ndo, 1060 const u_char *pd, u_int itemlen, char *buf, u_int buflen) 1061 { 1062 struct in6_addr addr; 1063 u_int plen, plenbytes; 1064 1065 ND_TCHECK(pd[0]); 1066 ITEMCHECK(1); 1067 plen = pd[0]; 1068 if (128 < plen) 1069 return -1; 1070 itemlen -= 1; 1071 1072 memset(&addr, 0, sizeof(addr)); 1073 plenbytes = (plen + 7) / 8; 1074 ND_TCHECK2(pd[1], plenbytes); 1075 ITEMCHECK(plenbytes); 1076 memcpy(&addr, &pd[1], plenbytes); 1077 if (plen % 8) { 1078 addr.s6_addr[plenbytes - 1] &= 1079 ((0xff00 >> (plen % 8)) & 0xff); 1080 } 1081 snprintf(buf, buflen, "%s/%d", getname6(ndo, (u_char *)&addr), plen); 1082 return 1 + plenbytes; 1083 1084 trunc: 1085 return -2; 1086 1087 badtlv: 1088 return -3; 1089 } 1090 1091 static int 1092 decode_labeled_prefix6(netdissect_options *ndo, 1093 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 1094 { 1095 struct in6_addr addr; 1096 u_int plen, plenbytes; 1097 1098 /* prefix length and label = 4 bytes */ 1099 ND_TCHECK2(pptr[0], 4); 1100 ITEMCHECK(4); 1101 plen = pptr[0]; /* get prefix length */ 1102 1103 if (24 > plen) 1104 return -1; 1105 1106 plen-=24; /* adjust prefixlen - labellength */ 1107 1108 if (128 < plen) 1109 return -1; 1110 itemlen -= 4; 1111 1112 memset(&addr, 0, sizeof(addr)); 1113 plenbytes = (plen + 7) / 8; 1114 ND_TCHECK2(pptr[4], plenbytes); 1115 memcpy(&addr, &pptr[4], plenbytes); 1116 if (plen % 8) { 1117 addr.s6_addr[plenbytes - 1] &= 1118 ((0xff00 >> (plen % 8)) & 0xff); 1119 } 1120 /* the label may get offsetted by 4 bits so lets shift it right */ 1121 snprintf(buf, buflen, "%s/%d, label:%u %s", 1122 getname6(ndo, (u_char *)&addr), 1123 plen, 1124 EXTRACT_24BITS(pptr+1)>>4, 1125 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1126 1127 return 4 + plenbytes; 1128 1129 trunc: 1130 return -2; 1131 1132 badtlv: 1133 return -3; 1134 } 1135 1136 static int 1137 decode_labeled_vpn_prefix6(netdissect_options *ndo, 1138 const u_char *pptr, char *buf, u_int buflen) 1139 { 1140 struct in6_addr addr; 1141 u_int plen; 1142 1143 ND_TCHECK(pptr[0]); 1144 plen = pptr[0]; /* get prefix length */ 1145 1146 if ((24+64) > plen) 1147 return -1; 1148 1149 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1150 1151 if (128 < plen) 1152 return -1; 1153 1154 memset(&addr, 0, sizeof(addr)); 1155 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1156 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1157 if (plen % 8) { 1158 addr.s6_addr[(plen + 7) / 8 - 1] &= 1159 ((0xff00 >> (plen % 8)) & 0xff); 1160 } 1161 /* the label may get offsetted by 4 bits so lets shift it right */ 1162 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1163 bgp_vpn_rd_print(ndo, pptr+4), 1164 getname6(ndo, (u_char *)&addr), 1165 plen, 1166 EXTRACT_24BITS(pptr+1)>>4, 1167 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1168 1169 return 12 + (plen + 7) / 8; 1170 1171 trunc: 1172 return -2; 1173 } 1174 #endif 1175 1176 static int 1177 decode_clnp_prefix(netdissect_options *ndo, 1178 const u_char *pptr, char *buf, u_int buflen) 1179 { 1180 uint8_t addr[19]; 1181 u_int plen; 1182 1183 ND_TCHECK(pptr[0]); 1184 plen = pptr[0]; /* get prefix length */ 1185 1186 if (152 < plen) 1187 return -1; 1188 1189 memset(&addr, 0, sizeof(addr)); 1190 ND_TCHECK2(pptr[4], (plen + 7) / 8); 1191 memcpy(&addr, &pptr[4], (plen + 7) / 8); 1192 if (plen % 8) { 1193 addr[(plen + 7) / 8 - 1] &= 1194 ((0xff00 >> (plen % 8)) & 0xff); 1195 } 1196 snprintf(buf, buflen, "%s/%d", 1197 isonsap_string(addr,(plen + 7) / 8), 1198 plen); 1199 1200 return 1 + (plen + 7) / 8; 1201 1202 trunc: 1203 return -2; 1204 } 1205 1206 static int 1207 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo, 1208 const u_char *pptr, char *buf, u_int buflen) 1209 { 1210 uint8_t addr[19]; 1211 u_int plen; 1212 1213 ND_TCHECK(pptr[0]); 1214 plen = pptr[0]; /* get prefix length */ 1215 1216 if ((24+64) > plen) 1217 return -1; 1218 1219 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1220 1221 if (152 < plen) 1222 return -1; 1223 1224 memset(&addr, 0, sizeof(addr)); 1225 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1226 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1227 if (plen % 8) { 1228 addr[(plen + 7) / 8 - 1] &= 1229 ((0xff00 >> (plen % 8)) & 0xff); 1230 } 1231 /* the label may get offsetted by 4 bits so lets shift it right */ 1232 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1233 bgp_vpn_rd_print(ndo, pptr+4), 1234 isonsap_string(addr,(plen + 7) / 8), 1235 plen, 1236 EXTRACT_24BITS(pptr+1)>>4, 1237 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1238 1239 return 12 + (plen + 7) / 8; 1240 1241 trunc: 1242 return -2; 1243 } 1244 1245 /* 1246 * bgp_attr_get_as_size 1247 * 1248 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as 1249 * both Old speakers that do not support 4 byte AS, and the new speakers that do 1250 * support, exchange AS-Path with the same path-attribute type value 0x02. 1251 */ 1252 static int 1253 bgp_attr_get_as_size(netdissect_options *ndo, 1254 uint8_t bgpa_type, const u_char *pptr, int len) 1255 { 1256 const u_char *tptr = pptr; 1257 1258 /* 1259 * If the path attribute is the optional AS4 path type, then we already 1260 * know, that ASs must be encoded in 4 byte format. 1261 */ 1262 if (bgpa_type == BGPTYPE_AS4_PATH) { 1263 return 4; 1264 } 1265 1266 /* 1267 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path 1268 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes 1269 * each. 1270 */ 1271 while (tptr < pptr + len) { 1272 ND_TCHECK(tptr[0]); 1273 1274 /* 1275 * If we do not find a valid segment type, our guess might be wrong. 1276 */ 1277 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) { 1278 goto trunc; 1279 } 1280 ND_TCHECK(tptr[1]); 1281 tptr += 2 + tptr[1] * 2; 1282 } 1283 1284 /* 1285 * If we correctly reached end of the AS path attribute data content, 1286 * then most likely ASs were indeed encoded as 2 bytes. 1287 */ 1288 if (tptr == pptr + len) { 1289 return 2; 1290 } 1291 1292 trunc: 1293 1294 /* 1295 * We can come here, either we did not have enough data, or if we 1296 * try to decode 4 byte ASs in 2 byte format. Either way, return 4, 1297 * so that calller can try to decode each AS as of 4 bytes. If indeed 1298 * there was not enough data, it will crib and end the parse anyways. 1299 */ 1300 return 4; 1301 } 1302 1303 static int 1304 bgp_attr_print(netdissect_options *ndo, 1305 u_int atype, const u_char *pptr, u_int len) 1306 { 1307 int i; 1308 uint16_t af; 1309 uint8_t safi, snpa, nhlen; 1310 union { /* copy buffer for bandwidth values */ 1311 float f; 1312 uint32_t i; 1313 } bw; 1314 int advance; 1315 u_int tlen; 1316 const u_char *tptr; 1317 char buf[MAXHOSTNAMELEN + 100]; 1318 char tokbuf[TOKBUFSIZE]; 1319 int as_size; 1320 1321 tptr = pptr; 1322 tlen=len; 1323 1324 switch (atype) { 1325 case BGPTYPE_ORIGIN: 1326 if (len != 1) 1327 ND_PRINT((ndo, "invalid len")); 1328 else { 1329 ND_TCHECK(*tptr); 1330 ND_PRINT((ndo, "%s", tok2strbuf(bgp_origin_values, 1331 "Unknown Origin Typecode", 1332 tptr[0], 1333 tokbuf, sizeof(tokbuf)))); 1334 } 1335 break; 1336 1337 1338 /* 1339 * Process AS4 byte path and AS2 byte path attributes here. 1340 */ 1341 case BGPTYPE_AS4_PATH: 1342 case BGPTYPE_AS_PATH: 1343 if (len % 2) { 1344 ND_PRINT((ndo, "invalid len")); 1345 break; 1346 } 1347 if (!len) { 1348 ND_PRINT((ndo, "empty")); 1349 break; 1350 } 1351 1352 /* 1353 * BGP updates exchanged between New speakers that support 4 1354 * byte AS, ASs are always encoded in 4 bytes. There is no 1355 * definitive way to find this, just by the packet's 1356 * contents. So, check for packet's TLV's sanity assuming 1357 * 2 bytes first, and it does not pass, assume that ASs are 1358 * encoded in 4 bytes format and move on. 1359 */ 1360 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); 1361 1362 while (tptr < pptr + len) { 1363 ND_TCHECK(tptr[0]); 1364 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_open_values, 1365 "?", tptr[0], 1366 tokbuf, sizeof(tokbuf)))); 1367 for (i = 0; i < tptr[1] * as_size; i += as_size) { 1368 ND_TCHECK2(tptr[2 + i], as_size); 1369 ND_PRINT((ndo, "%s ", 1370 as_printf(ndo, astostr, sizeof(astostr), 1371 as_size == 2 ? 1372 EXTRACT_16BITS(&tptr[2 + i]) : 1373 EXTRACT_32BITS(&tptr[2 + i])))); 1374 } 1375 ND_TCHECK(tptr[0]); 1376 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_close_values, 1377 "?", tptr[0], 1378 tokbuf, sizeof(tokbuf)))); 1379 ND_TCHECK(tptr[1]); 1380 tptr += 2 + tptr[1] * as_size; 1381 } 1382 break; 1383 case BGPTYPE_NEXT_HOP: 1384 if (len != 4) 1385 ND_PRINT((ndo, "invalid len")); 1386 else { 1387 ND_TCHECK2(tptr[0], 4); 1388 ND_PRINT((ndo, "%s", getname(ndo, tptr))); 1389 } 1390 break; 1391 case BGPTYPE_MULTI_EXIT_DISC: 1392 case BGPTYPE_LOCAL_PREF: 1393 if (len != 4) 1394 ND_PRINT((ndo, "invalid len")); 1395 else { 1396 ND_TCHECK2(tptr[0], 4); 1397 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr))); 1398 } 1399 break; 1400 case BGPTYPE_ATOMIC_AGGREGATE: 1401 if (len != 0) 1402 ND_PRINT((ndo, "invalid len")); 1403 break; 1404 case BGPTYPE_AGGREGATOR: 1405 1406 /* 1407 * Depending on the AS encoded is of 2 bytes or of 4 bytes, 1408 * the length of this PA can be either 6 bytes or 8 bytes. 1409 */ 1410 if (len != 6 && len != 8) { 1411 ND_PRINT((ndo, "invalid len")); 1412 break; 1413 } 1414 ND_TCHECK2(tptr[0], len); 1415 if (len == 6) { 1416 ND_PRINT((ndo, " AS #%s, origin %s", 1417 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)), 1418 getname(ndo, tptr + 2))); 1419 } else { 1420 ND_PRINT((ndo, " AS #%s, origin %s", 1421 as_printf(ndo, astostr, sizeof(astostr), 1422 EXTRACT_32BITS(tptr)), getname(ndo, tptr + 4))); 1423 } 1424 break; 1425 case BGPTYPE_AGGREGATOR4: 1426 if (len != 8) { 1427 ND_PRINT((ndo, "invalid len")); 1428 break; 1429 } 1430 ND_TCHECK2(tptr[0], 8); 1431 ND_PRINT((ndo, " AS #%s, origin %s", 1432 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)), 1433 getname(ndo, tptr + 4))); 1434 break; 1435 case BGPTYPE_COMMUNITIES: 1436 if (len % 4) { 1437 ND_PRINT((ndo, "invalid len")); 1438 break; 1439 } 1440 while (tlen>0) { 1441 uint32_t comm; 1442 ND_TCHECK2(tptr[0], 4); 1443 comm = EXTRACT_32BITS(tptr); 1444 switch (comm) { 1445 case BGP_COMMUNITY_NO_EXPORT: 1446 ND_PRINT((ndo, " NO_EXPORT")); 1447 break; 1448 case BGP_COMMUNITY_NO_ADVERT: 1449 ND_PRINT((ndo, " NO_ADVERTISE")); 1450 break; 1451 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: 1452 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED")); 1453 break; 1454 default: 1455 ND_PRINT((ndo, "%u:%u%s", 1456 (comm >> 16) & 0xffff, 1457 comm & 0xffff, 1458 (tlen>4) ? ", " : "")); 1459 break; 1460 } 1461 tlen -=4; 1462 tptr +=4; 1463 } 1464 break; 1465 case BGPTYPE_ORIGINATOR_ID: 1466 if (len != 4) { 1467 ND_PRINT((ndo, "invalid len")); 1468 break; 1469 } 1470 ND_TCHECK2(tptr[0], 4); 1471 ND_PRINT((ndo, "%s",getname(ndo, tptr))); 1472 break; 1473 case BGPTYPE_CLUSTER_LIST: 1474 if (len % 4) { 1475 ND_PRINT((ndo, "invalid len")); 1476 break; 1477 } 1478 while (tlen>0) { 1479 ND_TCHECK2(tptr[0], 4); 1480 ND_PRINT((ndo, "%s%s", 1481 getname(ndo, tptr), 1482 (tlen>4) ? ", " : "")); 1483 tlen -=4; 1484 tptr +=4; 1485 } 1486 break; 1487 case BGPTYPE_MP_REACH_NLRI: 1488 ND_TCHECK2(tptr[0], 3); 1489 af = EXTRACT_16BITS(tptr); 1490 safi = tptr[2]; 1491 1492 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1493 tok2strbuf(af_values, "Unknown AFI", af, 1494 tokbuf, sizeof(tokbuf)), 1495 af, 1496 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1497 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi, 1498 tokbuf, sizeof(tokbuf)), 1499 safi)); 1500 1501 switch(af<<8 | safi) { 1502 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1503 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1504 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1505 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1506 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1507 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1508 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1509 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1510 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1511 case (AFNUM_INET<<8 | SAFNUM_MDT): 1512 #ifdef INET6 1513 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1514 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1515 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1516 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1517 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1518 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1519 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1520 #endif 1521 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1522 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1523 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1524 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1525 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1526 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1527 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1528 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1529 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1530 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1531 break; 1532 default: 1533 ND_TCHECK2(tptr[0], tlen); 1534 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1535 if (ndo->ndo_vflag <= 1) 1536 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1537 goto done; 1538 break; 1539 } 1540 1541 tptr +=3; 1542 1543 ND_TCHECK(tptr[0]); 1544 nhlen = tptr[0]; 1545 tlen = nhlen; 1546 tptr++; 1547 1548 if (tlen) { 1549 int nnh = 0; 1550 ND_PRINT((ndo, "\n\t nexthop: ")); 1551 while (tlen > 0) { 1552 if ( nnh++ > 0 ) { 1553 ND_PRINT((ndo, ", " )); 1554 } 1555 switch(af<<8 | safi) { 1556 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1557 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1558 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1559 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1560 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1561 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1562 case (AFNUM_INET<<8 | SAFNUM_MDT): 1563 if (tlen < (int)sizeof(struct in_addr)) { 1564 ND_PRINT((ndo, "invalid len")); 1565 tlen = 0; 1566 } else { 1567 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1568 ND_PRINT((ndo, "%s",getname(ndo, tptr))); 1569 tlen -= sizeof(struct in_addr); 1570 tptr += sizeof(struct in_addr); 1571 } 1572 break; 1573 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1574 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1575 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1576 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { 1577 ND_PRINT((ndo, "invalid len")); 1578 tlen = 0; 1579 } else { 1580 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1581 ND_PRINT((ndo, "RD: %s, %s", 1582 bgp_vpn_rd_print(ndo, tptr), 1583 getname(ndo, tptr+BGP_VPN_RD_LEN))); 1584 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1585 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1586 } 1587 break; 1588 #ifdef INET6 1589 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1590 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1591 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1592 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1593 if (tlen < (int)sizeof(struct in6_addr)) { 1594 ND_PRINT((ndo, "invalid len")); 1595 tlen = 0; 1596 } else { 1597 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)); 1598 ND_PRINT((ndo, "%s", getname6(ndo, tptr))); 1599 tlen -= sizeof(struct in6_addr); 1600 tptr += sizeof(struct in6_addr); 1601 } 1602 break; 1603 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1604 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1605 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1606 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { 1607 ND_PRINT((ndo, "invalid len")); 1608 tlen = 0; 1609 } else { 1610 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1611 ND_PRINT((ndo, "RD: %s, %s", 1612 bgp_vpn_rd_print(ndo, tptr), 1613 getname6(ndo, tptr+BGP_VPN_RD_LEN))); 1614 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1615 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1616 } 1617 break; 1618 #endif 1619 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1620 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1621 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1622 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1623 if (tlen < (int)sizeof(struct in_addr)) { 1624 ND_PRINT((ndo, "invalid len")); 1625 tlen = 0; 1626 } else { 1627 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1628 ND_PRINT((ndo, "%s", getname(ndo, tptr))); 1629 tlen -= (sizeof(struct in_addr)); 1630 tptr += (sizeof(struct in_addr)); 1631 } 1632 break; 1633 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1634 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1635 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1636 ND_TCHECK2(tptr[0], tlen); 1637 ND_PRINT((ndo, "%s", isonsap_string(tptr, tlen))); 1638 tptr += tlen; 1639 tlen = 0; 1640 break; 1641 1642 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1643 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1644 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1645 if (tlen < BGP_VPN_RD_LEN+1) { 1646 ND_PRINT((ndo, "invalid len")); 1647 tlen = 0; 1648 } else { 1649 ND_TCHECK2(tptr[0], tlen); 1650 ND_PRINT((ndo, "RD: %s, %s", 1651 bgp_vpn_rd_print(ndo, tptr), 1652 isonsap_string(tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN))); 1653 /* rfc986 mapped IPv4 address ? */ 1654 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601) 1655 ND_PRINT((ndo, " = %s", getname(ndo, tptr+BGP_VPN_RD_LEN+4))); 1656 #ifdef INET6 1657 /* rfc1888 mapped IPv6 address ? */ 1658 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000) 1659 ND_PRINT((ndo, " = %s", getname6(ndo, tptr+BGP_VPN_RD_LEN+3))); 1660 #endif 1661 tptr += tlen; 1662 tlen = 0; 1663 } 1664 break; 1665 default: 1666 ND_TCHECK2(tptr[0], tlen); 1667 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi)); 1668 if (ndo->ndo_vflag <= 1) 1669 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1670 tptr += tlen; 1671 tlen = 0; 1672 goto done; 1673 break; 1674 } 1675 } 1676 } 1677 ND_PRINT((ndo, ", nh-length: %u", nhlen)); 1678 tptr += tlen; 1679 1680 ND_TCHECK(tptr[0]); 1681 snpa = tptr[0]; 1682 tptr++; 1683 1684 if (snpa) { 1685 ND_PRINT((ndo, "\n\t %u SNPA", snpa)); 1686 for (/*nothing*/; snpa > 0; snpa--) { 1687 ND_TCHECK(tptr[0]); 1688 ND_PRINT((ndo, "\n\t %d bytes", tptr[0])); 1689 tptr += tptr[0] + 1; 1690 } 1691 } else { 1692 ND_PRINT((ndo, ", no SNPA")); 1693 } 1694 1695 while (len - (tptr - pptr) > 0) { 1696 switch (af<<8 | safi) { 1697 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1698 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1699 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1700 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1701 if (advance == -1) 1702 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1703 else if (advance == -2) 1704 goto trunc; 1705 else if (advance == -3) 1706 break; /* bytes left, but not enough */ 1707 else 1708 ND_PRINT((ndo, "\n\t %s", buf)); 1709 break; 1710 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1711 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1712 if (advance == -1) 1713 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1714 else if (advance == -2) 1715 goto trunc; 1716 else if (advance == -3) 1717 break; /* bytes left, but not enough */ 1718 else 1719 ND_PRINT((ndo, "\n\t %s", buf)); 1720 break; 1721 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1722 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1723 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1724 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1725 if (advance == -1) 1726 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1727 else if (advance == -2) 1728 goto trunc; 1729 else 1730 ND_PRINT((ndo, "\n\t %s", buf)); 1731 break; 1732 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1733 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf)); 1734 if (advance == -1) 1735 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1736 else if (advance == -2) 1737 goto trunc; 1738 else 1739 ND_PRINT((ndo, "\n\t %s", buf)); 1740 break; 1741 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1742 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1743 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 1744 if (advance == -1) 1745 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1746 else if (advance == -2) 1747 goto trunc; 1748 else 1749 ND_PRINT((ndo, "\n\t %s", buf)); 1750 break; 1751 1752 case (AFNUM_INET<<8 | SAFNUM_MDT): 1753 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 1754 if (advance == -1) 1755 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1756 else if (advance == -2) 1757 goto trunc; 1758 else 1759 ND_PRINT((ndo, "\n\t %s", buf)); 1760 break; 1761 #ifdef INET6 1762 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1763 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1764 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1765 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1766 if (advance == -1) 1767 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1768 else if (advance == -2) 1769 goto trunc; 1770 else if (advance == -3) 1771 break; /* bytes left, but not enough */ 1772 else 1773 ND_PRINT((ndo, "\n\t %s", buf)); 1774 break; 1775 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1776 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1777 if (advance == -1) 1778 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1779 else if (advance == -2) 1780 goto trunc; 1781 else if (advance == -3) 1782 break; /* bytes left, but not enough */ 1783 else 1784 ND_PRINT((ndo, "\n\t %s", buf)); 1785 break; 1786 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1787 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1788 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1789 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1790 if (advance == -1) 1791 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1792 else if (advance == -2) 1793 goto trunc; 1794 else 1795 ND_PRINT((ndo, "\n\t %s", buf)); 1796 break; 1797 #endif 1798 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1799 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1800 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1801 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1802 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1803 if (advance == -1) 1804 ND_PRINT((ndo, "\n\t (illegal length)")); 1805 else if (advance == -2) 1806 goto trunc; 1807 else 1808 ND_PRINT((ndo, "\n\t %s", buf)); 1809 break; 1810 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1811 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1812 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1813 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1814 if (advance == -1) 1815 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1816 else if (advance == -2) 1817 goto trunc; 1818 else 1819 ND_PRINT((ndo, "\n\t %s", buf)); 1820 break; 1821 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1822 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1823 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1824 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1825 if (advance == -1) 1826 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1827 else if (advance == -2) 1828 goto trunc; 1829 else 1830 ND_PRINT((ndo, "\n\t %s", buf)); 1831 break; 1832 default: 1833 ND_TCHECK2(*tptr,tlen); 1834 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1835 if (ndo->ndo_vflag <= 1) 1836 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1837 advance = 0; 1838 tptr = pptr + len; 1839 break; 1840 } 1841 if (advance < 0) 1842 break; 1843 tptr += advance; 1844 } 1845 done: 1846 break; 1847 1848 case BGPTYPE_MP_UNREACH_NLRI: 1849 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE); 1850 af = EXTRACT_16BITS(tptr); 1851 safi = tptr[2]; 1852 1853 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1854 tok2strbuf(af_values, "Unknown AFI", af, 1855 tokbuf, sizeof(tokbuf)), 1856 af, 1857 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1858 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi, 1859 tokbuf, sizeof(tokbuf)), 1860 safi)); 1861 1862 if (len == BGP_MP_NLRI_MINSIZE) 1863 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 1864 1865 tptr += 3; 1866 1867 while (len - (tptr - pptr) > 0) { 1868 switch (af<<8 | safi) { 1869 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1870 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1871 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1872 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1873 if (advance == -1) 1874 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1875 else if (advance == -2) 1876 goto trunc; 1877 else if (advance == -3) 1878 break; /* bytes left, but not enough */ 1879 else 1880 ND_PRINT((ndo, "\n\t %s", buf)); 1881 break; 1882 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1883 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1884 if (advance == -1) 1885 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1886 else if (advance == -2) 1887 goto trunc; 1888 else if (advance == -3) 1889 break; /* bytes left, but not enough */ 1890 else 1891 ND_PRINT((ndo, "\n\t %s", buf)); 1892 break; 1893 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1894 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1895 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1896 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1897 if (advance == -1) 1898 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1899 else if (advance == -2) 1900 goto trunc; 1901 else 1902 ND_PRINT((ndo, "\n\t %s", buf)); 1903 break; 1904 #ifdef INET6 1905 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1906 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1907 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1908 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1909 if (advance == -1) 1910 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1911 else if (advance == -2) 1912 goto trunc; 1913 else if (advance == -3) 1914 break; /* bytes left, but not enough */ 1915 else 1916 ND_PRINT((ndo, "\n\t %s", buf)); 1917 break; 1918 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1919 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1920 if (advance == -1) 1921 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1922 else if (advance == -2) 1923 goto trunc; 1924 else if (advance == -3) 1925 break; /* bytes left, but not enough */ 1926 else 1927 ND_PRINT((ndo, "\n\t %s", buf)); 1928 break; 1929 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1930 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1931 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1932 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1933 if (advance == -1) 1934 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1935 else if (advance == -2) 1936 goto trunc; 1937 else 1938 ND_PRINT((ndo, "\n\t %s", buf)); 1939 break; 1940 #endif 1941 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1942 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1943 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1944 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1945 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1946 if (advance == -1) 1947 ND_PRINT((ndo, "\n\t (illegal length)")); 1948 else if (advance == -2) 1949 goto trunc; 1950 else 1951 ND_PRINT((ndo, "\n\t %s", buf)); 1952 break; 1953 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1954 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1955 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1956 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1957 if (advance == -1) 1958 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1959 else if (advance == -2) 1960 goto trunc; 1961 else 1962 ND_PRINT((ndo, "\n\t %s", buf)); 1963 break; 1964 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1965 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1966 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1967 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1968 if (advance == -1) 1969 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1970 else if (advance == -2) 1971 goto trunc; 1972 else 1973 ND_PRINT((ndo, "\n\t %s", buf)); 1974 break; 1975 case (AFNUM_INET<<8 | SAFNUM_MDT): 1976 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 1977 if (advance == -1) 1978 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1979 else if (advance == -2) 1980 goto trunc; 1981 else 1982 ND_PRINT((ndo, "\n\t %s", buf)); 1983 break; 1984 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1985 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1986 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 1987 if (advance == -1) 1988 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1989 else if (advance == -2) 1990 goto trunc; 1991 else 1992 ND_PRINT((ndo, "\n\t %s", buf)); 1993 break; 1994 default: 1995 ND_TCHECK2(*(tptr-3),tlen); 1996 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi)); 1997 if (ndo->ndo_vflag <= 1) 1998 print_unknown_data(ndo, tptr-3, "\n\t ", tlen); 1999 advance = 0; 2000 tptr = pptr + len; 2001 break; 2002 } 2003 if (advance < 0) 2004 break; 2005 tptr += advance; 2006 } 2007 break; 2008 case BGPTYPE_EXTD_COMMUNITIES: 2009 if (len % 8) { 2010 ND_PRINT((ndo, "invalid len")); 2011 break; 2012 } 2013 while (tlen>0) { 2014 uint16_t extd_comm; 2015 2016 ND_TCHECK2(tptr[0], 2); 2017 extd_comm=EXTRACT_16BITS(tptr); 2018 2019 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]", 2020 tok2strbuf(bgp_extd_comm_subtype_values, 2021 "unknown extd community typecode", 2022 extd_comm, tokbuf, sizeof(tokbuf)), 2023 extd_comm, 2024 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm))); 2025 2026 ND_TCHECK2(*(tptr+2), 6); 2027 switch(extd_comm) { 2028 case BGP_EXT_COM_RT_0: 2029 case BGP_EXT_COM_RO_0: 2030 case BGP_EXT_COM_L2VPN_RT_0: 2031 ND_PRINT((ndo, ": %u:%u (= %s)", 2032 EXTRACT_16BITS(tptr+2), 2033 EXTRACT_32BITS(tptr+4), 2034 getname(ndo, tptr+4))); 2035 break; 2036 case BGP_EXT_COM_RT_1: 2037 case BGP_EXT_COM_RO_1: 2038 case BGP_EXT_COM_L2VPN_RT_1: 2039 case BGP_EXT_COM_VRF_RT_IMP: 2040 ND_PRINT((ndo, ": %s:%u", 2041 getname(ndo, tptr+2), 2042 EXTRACT_16BITS(tptr+6))); 2043 break; 2044 case BGP_EXT_COM_RT_2: 2045 case BGP_EXT_COM_RO_2: 2046 ND_PRINT((ndo, ": %s:%u", 2047 as_printf(ndo, astostr, sizeof(astostr), 2048 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6))); 2049 break; 2050 case BGP_EXT_COM_LINKBAND: 2051 bw.i = EXTRACT_32BITS(tptr+2); 2052 ND_PRINT((ndo, ": bandwidth: %.3f Mbps", 2053 bw.f*8/1000000)); 2054 break; 2055 case BGP_EXT_COM_VPN_ORIGIN: 2056 case BGP_EXT_COM_VPN_ORIGIN2: 2057 case BGP_EXT_COM_VPN_ORIGIN3: 2058 case BGP_EXT_COM_VPN_ORIGIN4: 2059 case BGP_EXT_COM_OSPF_RID: 2060 case BGP_EXT_COM_OSPF_RID2: 2061 ND_PRINT((ndo, "%s", getname(ndo, tptr+2))); 2062 break; 2063 case BGP_EXT_COM_OSPF_RTYPE: 2064 case BGP_EXT_COM_OSPF_RTYPE2: 2065 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s", 2066 getname(ndo, tptr+2), 2067 tok2strbuf(bgp_extd_comm_ospf_rtype_values, 2068 "unknown (0x%02x)", 2069 *(tptr+6), 2070 tokbuf, sizeof(tokbuf)), 2071 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", 2072 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "")); 2073 break; 2074 case BGP_EXT_COM_L2INFO: 2075 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u", 2076 tok2strbuf(l2vpn_encaps_values, 2077 "unknown encaps", 2078 *(tptr+2), 2079 tokbuf, sizeof(tokbuf)), 2080 *(tptr+3), 2081 EXTRACT_16BITS(tptr+4))); 2082 break; 2083 case BGP_EXT_COM_SOURCE_AS: 2084 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2))); 2085 break; 2086 default: 2087 ND_TCHECK2(*tptr,8); 2088 print_unknown_data(ndo, tptr, "\n\t ", 8); 2089 break; 2090 } 2091 tlen -=8; 2092 tptr +=8; 2093 } 2094 break; 2095 2096 case BGPTYPE_PMSI_TUNNEL: 2097 { 2098 uint8_t tunnel_type, flags; 2099 2100 tunnel_type = *(tptr+1); 2101 flags = *tptr; 2102 tlen = len; 2103 2104 ND_TCHECK2(tptr[0], 5); 2105 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", 2106 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), 2107 tunnel_type, 2108 bittok2str(bgp_pmsi_flag_values, "none", flags), 2109 EXTRACT_24BITS(tptr+2)>>4)); 2110 2111 tptr +=5; 2112 tlen -= 5; 2113 2114 switch (tunnel_type) { 2115 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ 2116 case BGP_PMSI_TUNNEL_PIM_BIDIR: 2117 ND_TCHECK2(tptr[0], 8); 2118 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s", 2119 ipaddr_string(ndo, tptr), 2120 ipaddr_string(ndo, tptr+4))); 2121 break; 2122 2123 case BGP_PMSI_TUNNEL_PIM_SSM: 2124 ND_TCHECK2(tptr[0], 8); 2125 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s", 2126 ipaddr_string(ndo, tptr), 2127 ipaddr_string(ndo, tptr+4))); 2128 break; 2129 case BGP_PMSI_TUNNEL_INGRESS: 2130 ND_TCHECK2(tptr[0], 4); 2131 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s", 2132 ipaddr_string(ndo, tptr))); 2133 break; 2134 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ 2135 case BGP_PMSI_TUNNEL_LDP_MP2MP: 2136 ND_TCHECK2(tptr[0], 8); 2137 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x", 2138 ipaddr_string(ndo, tptr), 2139 EXTRACT_32BITS(tptr+4))); 2140 break; 2141 case BGP_PMSI_TUNNEL_RSVP_P2MP: 2142 ND_TCHECK2(tptr[0], 8); 2143 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", 2144 ipaddr_string(ndo, tptr), 2145 EXTRACT_32BITS(tptr+4))); 2146 break; 2147 default: 2148 if (ndo->ndo_vflag <= 1) { 2149 print_unknown_data(ndo, tptr, "\n\t ", tlen); 2150 } 2151 } 2152 break; 2153 } 2154 case BGPTYPE_ATTR_SET: 2155 ND_TCHECK2(tptr[0], 4); 2156 if (len < 4) 2157 goto trunc; 2158 ND_PRINT((ndo, "\n\t Origin AS: %s", 2159 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)))); 2160 tptr+=4; 2161 len -=4; 2162 2163 while (len) { 2164 u_int aflags, atype, alenlen, alen; 2165 2166 ND_TCHECK2(tptr[0], 2); 2167 if (len < 2) 2168 goto trunc; 2169 aflags = *tptr; 2170 atype = *(tptr + 1); 2171 tptr += 2; 2172 len -= 2; 2173 alenlen = bgp_attr_lenlen(aflags, tptr); 2174 ND_TCHECK2(tptr[0], alenlen); 2175 if (len < alenlen) 2176 goto trunc; 2177 alen = bgp_attr_len(aflags, tptr); 2178 tptr += alenlen; 2179 len -= alenlen; 2180 2181 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2182 tok2strbuf(bgp_attr_values, 2183 "Unknown Attribute", atype, 2184 tokbuf, sizeof(tokbuf)), 2185 atype, 2186 alen)); 2187 2188 if (aflags) { 2189 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2190 aflags & 0x80 ? "O" : "", 2191 aflags & 0x40 ? "T" : "", 2192 aflags & 0x20 ? "P" : "", 2193 aflags & 0x10 ? "E" : "")); 2194 if (aflags & 0xf) 2195 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2196 ND_PRINT((ndo, "]: ")); 2197 } 2198 /* FIXME check for recursion */ 2199 if (!bgp_attr_print(ndo, atype, tptr, alen)) 2200 return 0; 2201 tptr += alen; 2202 len -= alen; 2203 } 2204 break; 2205 2206 2207 default: 2208 ND_TCHECK2(*pptr,len); 2209 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */ 2210 if (ndo->ndo_vflag <= 1) 2211 print_unknown_data(ndo, pptr, "\n\t ", len); 2212 break; 2213 } 2214 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/ 2215 ND_TCHECK2(*pptr,len); 2216 print_unknown_data(ndo, pptr, "\n\t ", len); 2217 } 2218 return 1; 2219 2220 trunc: 2221 return 0; 2222 } 2223 2224 static void 2225 bgp_capabilities_print(netdissect_options *ndo, 2226 const u_char *opt, int caps_len) 2227 { 2228 char tokbuf[TOKBUFSIZE]; 2229 char tokbuf2[TOKBUFSIZE]; 2230 int cap_type, cap_len, tcap_len, cap_offset; 2231 int i = 0; 2232 2233 while (i < caps_len) { 2234 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE); 2235 cap_type=opt[i]; 2236 cap_len=opt[i+1]; 2237 tcap_len=cap_len; 2238 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2239 tok2strbuf(bgp_capcode_values, "Unknown", 2240 cap_type, tokbuf, sizeof(tokbuf)), 2241 cap_type, 2242 cap_len)); 2243 ND_TCHECK2(opt[i+2], cap_len); 2244 switch (cap_type) { 2245 case BGP_CAPCODE_MP: 2246 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)", 2247 tok2strbuf(af_values, "Unknown", 2248 EXTRACT_16BITS(opt+i+2), 2249 tokbuf, sizeof(tokbuf)), 2250 EXTRACT_16BITS(opt+i+2), 2251 tok2strbuf(bgp_safi_values, "Unknown", 2252 opt[i+5], 2253 tokbuf, sizeof(tokbuf)), 2254 opt[i+5])); 2255 break; 2256 case BGP_CAPCODE_RESTART: 2257 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us", 2258 ((opt[i+2])&0x80) ? "R" : "none", 2259 EXTRACT_16BITS(opt+i+2)&0xfff)); 2260 tcap_len-=2; 2261 cap_offset=4; 2262 while(tcap_len>=4) { 2263 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", 2264 tok2strbuf(af_values,"Unknown", 2265 EXTRACT_16BITS(opt+i+cap_offset), 2266 tokbuf, sizeof(tokbuf)), 2267 EXTRACT_16BITS(opt+i+cap_offset), 2268 tok2strbuf(bgp_safi_values,"Unknown", 2269 opt[i+cap_offset+2], 2270 tokbuf2, sizeof(tokbuf2)), 2271 opt[i+cap_offset+2], 2272 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" )); 2273 tcap_len-=4; 2274 cap_offset+=4; 2275 } 2276 break; 2277 case BGP_CAPCODE_RR: 2278 case BGP_CAPCODE_RR_CISCO: 2279 break; 2280 case BGP_CAPCODE_AS_NEW: 2281 2282 /* 2283 * Extract the 4 byte AS number encoded. 2284 */ 2285 if (cap_len == 4) { 2286 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s", 2287 as_printf(ndo, astostr, sizeof(astostr), 2288 EXTRACT_32BITS(opt + i + 2)))); 2289 } 2290 break; 2291 default: 2292 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u", 2293 cap_type)); 2294 if (ndo->ndo_vflag <= 1) 2295 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2296 break; 2297 } 2298 if (ndo->ndo_vflag > 1 && cap_len > 0) { 2299 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2300 } 2301 i += BGP_CAP_HEADER_SIZE + cap_len; 2302 } 2303 return; 2304 2305 trunc: 2306 ND_PRINT((ndo, "[|BGP]")); 2307 } 2308 2309 static void 2310 bgp_open_print(netdissect_options *ndo, 2311 const u_char *dat, int length) 2312 { 2313 struct bgp_open bgpo; 2314 struct bgp_opt bgpopt; 2315 const u_char *opt; 2316 int i; 2317 char tokbuf[TOKBUFSIZE]; 2318 2319 ND_TCHECK2(dat[0], BGP_OPEN_SIZE); 2320 memcpy(&bgpo, dat, BGP_OPEN_SIZE); 2321 2322 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version)); 2323 ND_PRINT((ndo, "my AS %s, ", 2324 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas)))); 2325 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime))); 2326 ND_PRINT((ndo, "ID %s", getname(ndo, (u_char *)&bgpo.bgpo_id))); 2327 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen)); 2328 2329 /* some little sanity checking */ 2330 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) 2331 return; 2332 2333 /* ugly! */ 2334 opt = &((const struct bgp_open *)dat)->bgpo_optlen; 2335 opt++; 2336 2337 i = 0; 2338 while (i < bgpo.bgpo_optlen) { 2339 ND_TCHECK2(opt[i], BGP_OPT_SIZE); 2340 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); 2341 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { 2342 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len)); 2343 break; 2344 } 2345 2346 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u", 2347 tok2strbuf(bgp_opt_values,"Unknown", 2348 bgpopt.bgpopt_type, 2349 tokbuf, sizeof(tokbuf)), 2350 bgpopt.bgpopt_type, 2351 bgpopt.bgpopt_len)); 2352 2353 /* now let's decode the options we know*/ 2354 switch(bgpopt.bgpopt_type) { 2355 2356 case BGP_OPT_CAP: 2357 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE], 2358 bgpopt.bgpopt_len); 2359 break; 2360 2361 case BGP_OPT_AUTH: 2362 default: 2363 ND_PRINT((ndo, "\n\t no decoder for option %u", 2364 bgpopt.bgpopt_type)); 2365 break; 2366 } 2367 i += BGP_OPT_SIZE + bgpopt.bgpopt_len; 2368 } 2369 return; 2370 trunc: 2371 ND_PRINT((ndo, "[|BGP]")); 2372 } 2373 2374 static void 2375 bgp_update_print(netdissect_options *ndo, 2376 const u_char *dat, int length) 2377 { 2378 struct bgp bgp; 2379 const u_char *p; 2380 int withdrawn_routes_len; 2381 int len; 2382 int i; 2383 char tokbuf[TOKBUFSIZE]; 2384 #ifndef INET6 2385 char buf[MAXHOSTNAMELEN + 100]; 2386 int wpfx; 2387 #endif 2388 2389 ND_TCHECK2(dat[0], BGP_SIZE); 2390 if (length < BGP_SIZE) 2391 goto trunc; 2392 memcpy(&bgp, dat, BGP_SIZE); 2393 p = dat + BGP_SIZE; /*XXX*/ 2394 length -= BGP_SIZE; 2395 2396 /* Unfeasible routes */ 2397 ND_TCHECK2(p[0], 2); 2398 if (length < 2) 2399 goto trunc; 2400 withdrawn_routes_len = EXTRACT_16BITS(p); 2401 p += 2; 2402 length -= 2; 2403 if (withdrawn_routes_len) { 2404 /* 2405 * Without keeping state from the original NLRI message, 2406 * it's not possible to tell if this a v4 or v6 route, 2407 * so only try to decode it if we're not v6 enabled. 2408 */ 2409 ND_TCHECK2(p[0], withdrawn_routes_len); 2410 if (length < withdrawn_routes_len) 2411 goto trunc; 2412 #ifdef INET6 2413 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len)); 2414 p += withdrawn_routes_len; 2415 length -= withdrawn_routes_len; 2416 #else 2417 if (withdrawn_routes_len < 2) 2418 goto trunc; 2419 length -= 2; 2420 withdrawn_routes_len -= 2; 2421 2422 2423 ND_PRINT((ndo, "\n\t Withdrawn routes:")); 2424 2425 while(withdrawn_routes_len > 0) { 2426 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf)); 2427 if (wpfx == -1) { 2428 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2429 break; 2430 } else if (wpfx == -2) 2431 goto trunc; 2432 else if (wpfx == -3) 2433 goto trunc; /* bytes left, but not enough */ 2434 else { 2435 ND_PRINT((ndo, "\n\t %s", buf)); 2436 p += wpfx; 2437 length -= wpfx; 2438 withdrawn_routes_len -= wpfx; 2439 } 2440 } 2441 #endif 2442 } 2443 2444 ND_TCHECK2(p[0], 2); 2445 if (length < 2) 2446 goto trunc; 2447 len = EXTRACT_16BITS(p); 2448 p += 2; 2449 length -= 2; 2450 2451 if (withdrawn_routes_len == 0 && len == 0 && length == 0) { 2452 /* No withdrawn routes, no path attributes, no NLRI */ 2453 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 2454 return; 2455 } 2456 2457 if (len) { 2458 /* do something more useful!*/ 2459 while (len) { 2460 int aflags, atype, alenlen, alen; 2461 2462 ND_TCHECK2(p[0], 2); 2463 if (len < 2) 2464 goto trunc; 2465 if (length < 2) 2466 goto trunc; 2467 aflags = *p; 2468 atype = *(p + 1); 2469 p += 2; 2470 len -= 2; 2471 length -= 2; 2472 alenlen = bgp_attr_lenlen(aflags, p); 2473 ND_TCHECK2(p[0], alenlen); 2474 if (len < alenlen) 2475 goto trunc; 2476 if (length < alenlen) 2477 goto trunc; 2478 alen = bgp_attr_len(aflags, p); 2479 p += alenlen; 2480 len -= alenlen; 2481 length -= alenlen; 2482 2483 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2484 tok2strbuf(bgp_attr_values, "Unknown Attribute", 2485 atype, 2486 tokbuf, sizeof(tokbuf)), 2487 atype, 2488 alen)); 2489 2490 if (aflags) { 2491 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2492 aflags & 0x80 ? "O" : "", 2493 aflags & 0x40 ? "T" : "", 2494 aflags & 0x20 ? "P" : "", 2495 aflags & 0x10 ? "E" : "")); 2496 if (aflags & 0xf) 2497 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2498 ND_PRINT((ndo, "]: ")); 2499 } 2500 if (len < alen) 2501 goto trunc; 2502 if (length < alen) 2503 goto trunc; 2504 if (!bgp_attr_print(ndo, atype, p, alen)) 2505 goto trunc; 2506 p += alen; 2507 len -= alen; 2508 length -= alen; 2509 } 2510 } 2511 2512 if (length) { 2513 /* 2514 * XXX - what if they're using the "Advertisement of 2515 * Multiple Paths in BGP" feature: 2516 * 2517 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/ 2518 * 2519 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06 2520 */ 2521 ND_PRINT((ndo, "\n\t Updated routes:")); 2522 while (length) { 2523 char buf[MAXHOSTNAMELEN + 100]; 2524 i = decode_prefix4(ndo, p, length, buf, sizeof(buf)); 2525 if (i == -1) { 2526 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2527 break; 2528 } else if (i == -2) 2529 goto trunc; 2530 else if (i == -3) 2531 goto trunc; /* bytes left, but not enough */ 2532 else { 2533 ND_PRINT((ndo, "\n\t %s", buf)); 2534 p += i; 2535 length -= i; 2536 } 2537 } 2538 } 2539 return; 2540 trunc: 2541 ND_PRINT((ndo, "[|BGP]")); 2542 } 2543 2544 static void 2545 bgp_notification_print(netdissect_options *ndo, 2546 const u_char *dat, int length) 2547 { 2548 struct bgp_notification bgpn; 2549 const u_char *tptr; 2550 char tokbuf[TOKBUFSIZE]; 2551 char tokbuf2[TOKBUFSIZE]; 2552 2553 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); 2554 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); 2555 2556 /* some little sanity checking */ 2557 if (length<BGP_NOTIFICATION_SIZE) 2558 return; 2559 2560 ND_PRINT((ndo, ", %s (%u)", 2561 tok2strbuf(bgp_notify_major_values, "Unknown Error", 2562 bgpn.bgpn_major, tokbuf, sizeof(tokbuf)), 2563 bgpn.bgpn_major)); 2564 2565 switch (bgpn.bgpn_major) { 2566 2567 case BGP_NOTIFY_MAJOR_MSG: 2568 ND_PRINT((ndo, ", subcode %s (%u)", 2569 tok2strbuf(bgp_notify_minor_msg_values, "Unknown", 2570 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2571 bgpn.bgpn_minor)); 2572 break; 2573 case BGP_NOTIFY_MAJOR_OPEN: 2574 ND_PRINT((ndo, ", subcode %s (%u)", 2575 tok2strbuf(bgp_notify_minor_open_values, "Unknown", 2576 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2577 bgpn.bgpn_minor)); 2578 break; 2579 case BGP_NOTIFY_MAJOR_UPDATE: 2580 ND_PRINT((ndo, ", subcode %s (%u)", 2581 tok2strbuf(bgp_notify_minor_update_values, "Unknown", 2582 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2583 bgpn.bgpn_minor)); 2584 break; 2585 case BGP_NOTIFY_MAJOR_CAP: 2586 ND_PRINT((ndo, " subcode %s (%u)", 2587 tok2strbuf(bgp_notify_minor_cap_values, "Unknown", 2588 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2589 bgpn.bgpn_minor)); 2590 case BGP_NOTIFY_MAJOR_CEASE: 2591 ND_PRINT((ndo, ", subcode %s (%u)", 2592 tok2strbuf(bgp_notify_minor_cease_values, "Unknown", 2593 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2594 bgpn.bgpn_minor)); 2595 2596 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes 2597 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES 2598 */ 2599 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { 2600 tptr = dat + BGP_NOTIFICATION_SIZE; 2601 ND_TCHECK2(*tptr, 7); 2602 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", 2603 tok2strbuf(af_values, "Unknown", 2604 EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)), 2605 EXTRACT_16BITS(tptr), 2606 tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2), 2607 tokbuf2, sizeof(tokbuf)), 2608 *(tptr+2), 2609 EXTRACT_32BITS(tptr+3))); 2610 } 2611 break; 2612 default: 2613 break; 2614 } 2615 2616 return; 2617 trunc: 2618 ND_PRINT((ndo, "[|BGP]")); 2619 } 2620 2621 static void 2622 bgp_route_refresh_print(netdissect_options *ndo, 2623 const u_char *pptr, int len) 2624 { 2625 const struct bgp_route_refresh *bgp_route_refresh_header; 2626 char tokbuf[TOKBUFSIZE]; 2627 char tokbuf2[TOKBUFSIZE]; 2628 2629 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE); 2630 2631 /* some little sanity checking */ 2632 if (len<BGP_ROUTE_REFRESH_SIZE) 2633 return; 2634 2635 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; 2636 2637 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)", 2638 tok2strbuf(af_values,"Unknown", 2639 /* this stinks but the compiler pads the structure 2640 * weird */ 2641 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2642 tokbuf, sizeof(tokbuf)), 2643 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2644 tok2strbuf(bgp_safi_values,"Unknown", 2645 bgp_route_refresh_header->safi, 2646 tokbuf2, sizeof(tokbuf2)), 2647 bgp_route_refresh_header->safi)); 2648 2649 if (ndo->ndo_vflag > 1) { 2650 ND_TCHECK2(*pptr, len); 2651 print_unknown_data(ndo, pptr, "\n\t ", len); 2652 } 2653 2654 return; 2655 trunc: 2656 ND_PRINT((ndo, "[|BGP]")); 2657 } 2658 2659 static int 2660 bgp_header_print(netdissect_options *ndo, 2661 const u_char *dat, int length) 2662 { 2663 struct bgp bgp; 2664 char tokbuf[TOKBUFSIZE]; 2665 2666 ND_TCHECK2(dat[0], BGP_SIZE); 2667 memcpy(&bgp, dat, BGP_SIZE); 2668 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u", 2669 tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type, 2670 tokbuf, sizeof(tokbuf)), 2671 bgp.bgp_type, 2672 length)); 2673 2674 switch (bgp.bgp_type) { 2675 case BGP_OPEN: 2676 bgp_open_print(ndo, dat, length); 2677 break; 2678 case BGP_UPDATE: 2679 bgp_update_print(ndo, dat, length); 2680 break; 2681 case BGP_NOTIFICATION: 2682 bgp_notification_print(ndo, dat, length); 2683 break; 2684 case BGP_KEEPALIVE: 2685 break; 2686 case BGP_ROUTE_REFRESH: 2687 bgp_route_refresh_print(ndo, dat, length); 2688 break; 2689 default: 2690 /* we have no decoder for the BGP message */ 2691 ND_TCHECK2(*dat, length); 2692 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type)); 2693 print_unknown_data(ndo, dat, "\n\t ", length); 2694 break; 2695 } 2696 return 1; 2697 trunc: 2698 ND_PRINT((ndo, "[|BGP]")); 2699 return 0; 2700 } 2701 2702 void 2703 bgp_print(netdissect_options *ndo, 2704 const u_char *dat, int length) 2705 { 2706 const u_char *p; 2707 const u_char *ep; 2708 const u_char *start; 2709 const u_char marker[] = { 2710 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2711 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2712 }; 2713 struct bgp bgp; 2714 uint16_t hlen; 2715 char tokbuf[TOKBUFSIZE]; 2716 2717 ep = dat + length; 2718 if (ndo->ndo_snapend < dat + length) 2719 ep = ndo->ndo_snapend; 2720 2721 ND_PRINT((ndo, ": BGP")); 2722 2723 if (ndo->ndo_vflag < 1) /* lets be less chatty */ 2724 return; 2725 2726 p = dat; 2727 start = p; 2728 while (p < ep) { 2729 if (!ND_TTEST2(p[0], 1)) 2730 break; 2731 if (p[0] != 0xff) { 2732 p++; 2733 continue; 2734 } 2735 2736 if (!ND_TTEST2(p[0], sizeof(marker))) 2737 break; 2738 if (memcmp(p, marker, sizeof(marker)) != 0) { 2739 p++; 2740 continue; 2741 } 2742 2743 /* found BGP header */ 2744 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/ 2745 memcpy(&bgp, p, BGP_SIZE); 2746 2747 if (start != p) 2748 ND_PRINT((ndo, " [|BGP]")); 2749 2750 hlen = ntohs(bgp.bgp_len); 2751 if (hlen < BGP_SIZE) { 2752 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen, 2753 BGP_SIZE)); 2754 break; 2755 } 2756 2757 if (ND_TTEST2(p[0], hlen)) { 2758 if (!bgp_header_print(ndo, p, hlen)) 2759 return; 2760 p += hlen; 2761 start = p; 2762 } else { 2763 ND_PRINT((ndo, "\n[|BGP %s]", 2764 tok2strbuf(bgp_msg_values, 2765 "Unknown Message Type", 2766 bgp.bgp_type, 2767 tokbuf, sizeof(tokbuf)))); 2768 break; 2769 } 2770 } 2771 2772 return; 2773 2774 trunc: 2775 ND_PRINT((ndo, " [|BGP]")); 2776 } 2777 2778 /* 2779 * Local Variables: 2780 * c-style: whitesmith 2781 * c-basic-offset: 4 2782 * End: 2783 */ 2784
