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 #include <sys/cdefs.h> 34 #ifndef lint 35 __RCSID("$NetBSD: print-bgp.c,v 1.6 2015/03/31 21:59:35 christos Exp $"); 36 #endif 37 38 #define NETDISSECT_REWORKED 39 #ifdef HAVE_CONFIG_H 40 #include "config.h" 41 #endif 42 43 #include <tcpdump-stdinc.h> 44 45 #include <stdio.h> 46 #include <string.h> 47 48 #include "interface.h" 49 #include "addrtoname.h" 50 #include "extract.h" 51 #include "af.h" 52 #include "l2vpn.h" 53 54 struct bgp { 55 uint8_t bgp_marker[16]; 56 uint16_t bgp_len; 57 uint8_t bgp_type; 58 }; 59 #define BGP_SIZE 19 /* unaligned */ 60 61 #define BGP_OPEN 1 62 #define BGP_UPDATE 2 63 #define BGP_NOTIFICATION 3 64 #define BGP_KEEPALIVE 4 65 #define BGP_ROUTE_REFRESH 5 66 67 static const struct tok bgp_msg_values[] = { 68 { BGP_OPEN, "Open"}, 69 { BGP_UPDATE, "Update"}, 70 { BGP_NOTIFICATION, "Notification"}, 71 { BGP_KEEPALIVE, "Keepalive"}, 72 { BGP_ROUTE_REFRESH, "Route Refresh"}, 73 { 0, NULL} 74 }; 75 76 struct bgp_open { 77 uint8_t bgpo_marker[16]; 78 uint16_t bgpo_len; 79 uint8_t bgpo_type; 80 uint8_t bgpo_version; 81 uint16_t bgpo_myas; 82 uint16_t bgpo_holdtime; 83 uint32_t bgpo_id; 84 uint8_t bgpo_optlen; 85 /* options should follow */ 86 }; 87 #define BGP_OPEN_SIZE 29 /* unaligned */ 88 89 struct bgp_opt { 90 uint8_t bgpopt_type; 91 uint8_t bgpopt_len; 92 /* variable length */ 93 }; 94 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */ 95 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */ 96 97 struct bgp_notification { 98 uint8_t bgpn_marker[16]; 99 uint16_t bgpn_len; 100 uint8_t bgpn_type; 101 uint8_t bgpn_major; 102 uint8_t bgpn_minor; 103 }; 104 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */ 105 106 struct bgp_route_refresh { 107 uint8_t bgp_marker[16]; 108 uint16_t len; 109 uint8_t type; 110 uint8_t afi[2]; /* the compiler messes this structure up */ 111 uint8_t res; /* when doing misaligned sequences of int8 and int16 */ 112 uint8_t safi; /* afi should be int16 - so we have to access it using */ 113 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */ 114 #define BGP_ROUTE_REFRESH_SIZE 23 115 116 #define bgp_attr_lenlen(flags, p) \ 117 (((flags) & 0x10) ? 2 : 1) 118 #define bgp_attr_len(flags, p) \ 119 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p)) 120 121 #define BGPTYPE_ORIGIN 1 122 #define BGPTYPE_AS_PATH 2 123 #define BGPTYPE_NEXT_HOP 3 124 #define BGPTYPE_MULTI_EXIT_DISC 4 125 #define BGPTYPE_LOCAL_PREF 5 126 #define BGPTYPE_ATOMIC_AGGREGATE 6 127 #define BGPTYPE_AGGREGATOR 7 128 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */ 129 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */ 130 #define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */ 131 #define BGPTYPE_DPA 11 /* draft-ietf-idr-bgp-dpa */ 132 #define BGPTYPE_ADVERTISERS 12 /* RFC1863 */ 133 #define BGPTYPE_RCID_PATH 13 /* RFC1863 */ 134 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */ 135 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */ 136 #define BGPTYPE_EXTD_COMMUNITIES 16 /* draft-ietf-idr-bgp-ext-communities */ 137 #define BGPTYPE_AS4_PATH 17 /* RFC4893 */ 138 #define BGPTYPE_AGGREGATOR4 18 /* RFC4893 */ 139 #define BGPTYPE_PMSI_TUNNEL 22 /* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */ 140 #define BGPTYPE_ATTR_SET 128 /* draft-marques-ppvpn-ibgp */ 141 142 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */ 143 144 static const struct tok bgp_attr_values[] = { 145 { BGPTYPE_ORIGIN, "Origin"}, 146 { BGPTYPE_AS_PATH, "AS Path"}, 147 { BGPTYPE_AS4_PATH, "AS4 Path"}, 148 { BGPTYPE_NEXT_HOP, "Next Hop"}, 149 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"}, 150 { BGPTYPE_LOCAL_PREF, "Local Preference"}, 151 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"}, 152 { BGPTYPE_AGGREGATOR, "Aggregator"}, 153 { BGPTYPE_AGGREGATOR4, "Aggregator4"}, 154 { BGPTYPE_COMMUNITIES, "Community"}, 155 { BGPTYPE_ORIGINATOR_ID, "Originator ID"}, 156 { BGPTYPE_CLUSTER_LIST, "Cluster List"}, 157 { BGPTYPE_DPA, "DPA"}, 158 { BGPTYPE_ADVERTISERS, "Advertisers"}, 159 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"}, 160 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"}, 161 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"}, 162 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"}, 163 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"}, 164 { BGPTYPE_ATTR_SET, "Attribute Set"}, 165 { 255, "Reserved for development"}, 166 { 0, NULL} 167 }; 168 169 #define BGP_AS_SET 1 170 #define BGP_AS_SEQUENCE 2 171 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */ 172 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */ 173 174 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET 175 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET 176 177 static const struct tok bgp_as_path_segment_open_values[] = { 178 { BGP_AS_SEQUENCE, ""}, 179 { BGP_AS_SET, "{ "}, 180 { BGP_CONFED_AS_SEQUENCE, "( "}, 181 { BGP_CONFED_AS_SET, "({ "}, 182 { 0, NULL} 183 }; 184 185 static const struct tok bgp_as_path_segment_close_values[] = { 186 { BGP_AS_SEQUENCE, ""}, 187 { BGP_AS_SET, "}"}, 188 { BGP_CONFED_AS_SEQUENCE, ")"}, 189 { BGP_CONFED_AS_SET, "})"}, 190 { 0, NULL} 191 }; 192 193 #define BGP_OPT_AUTH 1 194 #define BGP_OPT_CAP 2 195 196 197 static const struct tok bgp_opt_values[] = { 198 { BGP_OPT_AUTH, "Authentication Information"}, 199 { BGP_OPT_CAP, "Capabilities Advertisement"}, 200 { 0, NULL} 201 }; 202 203 #define BGP_CAPCODE_MP 1 204 #define BGP_CAPCODE_RR 2 205 #define BGP_CAPCODE_ORF 3 /* XXX */ 206 #define BGP_CAPCODE_RESTART 64 /* draft-ietf-idr-restart-05 */ 207 #define BGP_CAPCODE_AS_NEW 65 /* XXX */ 208 #define BGP_CAPCODE_DYN_CAP 67 /* XXX */ 209 #define BGP_CAPCODE_RR_CISCO 128 210 211 static const struct tok bgp_capcode_values[] = { 212 { BGP_CAPCODE_MP, "Multiprotocol Extensions"}, 213 { BGP_CAPCODE_RR, "Route Refresh"}, 214 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"}, 215 { BGP_CAPCODE_RESTART, "Graceful Restart"}, 216 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"}, 217 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"}, 218 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"}, 219 { 0, NULL} 220 }; 221 222 #define BGP_NOTIFY_MAJOR_MSG 1 223 #define BGP_NOTIFY_MAJOR_OPEN 2 224 #define BGP_NOTIFY_MAJOR_UPDATE 3 225 #define BGP_NOTIFY_MAJOR_HOLDTIME 4 226 #define BGP_NOTIFY_MAJOR_FSM 5 227 #define BGP_NOTIFY_MAJOR_CEASE 6 228 #define BGP_NOTIFY_MAJOR_CAP 7 229 230 static const struct tok bgp_notify_major_values[] = { 231 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"}, 232 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"}, 233 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"}, 234 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"}, 235 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"}, 236 { BGP_NOTIFY_MAJOR_CEASE, "Cease"}, 237 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"}, 238 { 0, NULL} 239 }; 240 241 /* draft-ietf-idr-cease-subcode-02 */ 242 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1 243 static const struct tok bgp_notify_minor_cease_values[] = { 244 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"}, 245 { 2, "Administratively Shutdown"}, 246 { 3, "Peer Unconfigured"}, 247 { 4, "Administratively Reset"}, 248 { 5, "Connection Rejected"}, 249 { 6, "Other Configuration Change"}, 250 { 7, "Connection Collision Resolution"}, 251 { 0, NULL} 252 }; 253 254 static const struct tok bgp_notify_minor_msg_values[] = { 255 { 1, "Connection Not Synchronized"}, 256 { 2, "Bad Message Length"}, 257 { 3, "Bad Message Type"}, 258 { 0, NULL} 259 }; 260 261 static const struct tok bgp_notify_minor_open_values[] = { 262 { 1, "Unsupported Version Number"}, 263 { 2, "Bad Peer AS"}, 264 { 3, "Bad BGP Identifier"}, 265 { 4, "Unsupported Optional Parameter"}, 266 { 5, "Authentication Failure"}, 267 { 6, "Unacceptable Hold Time"}, 268 { 7, "Capability Message Error"}, 269 { 0, NULL} 270 }; 271 272 static const struct tok bgp_notify_minor_update_values[] = { 273 { 1, "Malformed Attribute List"}, 274 { 2, "Unrecognized Well-known Attribute"}, 275 { 3, "Missing Well-known Attribute"}, 276 { 4, "Attribute Flags Error"}, 277 { 5, "Attribute Length Error"}, 278 { 6, "Invalid ORIGIN Attribute"}, 279 { 7, "AS Routing Loop"}, 280 { 8, "Invalid NEXT_HOP Attribute"}, 281 { 9, "Optional Attribute Error"}, 282 { 10, "Invalid Network Field"}, 283 { 11, "Malformed AS_PATH"}, 284 { 0, NULL} 285 }; 286 287 static const struct tok bgp_notify_minor_cap_values[] = { 288 { 1, "Invalid Action Value" }, 289 { 2, "Invalid Capability Length" }, 290 { 3, "Malformed Capability Value" }, 291 { 4, "Unsupported Capability Code" }, 292 { 0, NULL } 293 }; 294 295 static const struct tok bgp_origin_values[] = { 296 { 0, "IGP"}, 297 { 1, "EGP"}, 298 { 2, "Incomplete"}, 299 { 0, NULL} 300 }; 301 302 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1 303 #define BGP_PMSI_TUNNEL_LDP_P2MP 2 304 #define BGP_PMSI_TUNNEL_PIM_SSM 3 305 #define BGP_PMSI_TUNNEL_PIM_SM 4 306 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5 307 #define BGP_PMSI_TUNNEL_INGRESS 6 308 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7 309 310 static const struct tok bgp_pmsi_tunnel_values[] = { 311 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"}, 312 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"}, 313 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"}, 314 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"}, 315 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"}, 316 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"}, 317 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"}, 318 { 0, NULL} 319 }; 320 321 static const struct tok bgp_pmsi_flag_values[] = { 322 { 0x01, "Leaf Information required"}, 323 { 0, NULL} 324 }; 325 326 327 /* Subsequent address family identifier, RFC2283 section 7 */ 328 #define SAFNUM_RES 0 329 #define SAFNUM_UNICAST 1 330 #define SAFNUM_MULTICAST 2 331 #define SAFNUM_UNIMULTICAST 3 332 /* labeled BGP RFC3107 */ 333 #define SAFNUM_LABUNICAST 4 334 /* draft-ietf-l3vpn-2547bis-mcast-bgp-02.txt */ 335 #define SAFNUM_MULTICAST_VPN 5 336 #define SAFNUM_TUNNEL 64 /* XXX */ 337 #define SAFNUM_VPLS 65 /* XXX */ 338 /* draft-nalawade-idr-mdt-safi-03 */ 339 #define SAFNUM_MDT 66 340 /* Section 4.3.4 of draft-rosen-rfc2547bis-03.txt */ 341 #define SAFNUM_VPNUNICAST 128 342 #define SAFNUM_VPNMULTICAST 129 343 #define SAFNUM_VPNUNIMULTICAST 130 344 /* draft-marques-ppvpn-rt-constrain-01.txt */ 345 #define SAFNUM_RT_ROUTING_INFO 132 346 347 #define BGP_VPN_RD_LEN 8 348 349 static const struct tok bgp_safi_values[] = { 350 { SAFNUM_RES, "Reserved"}, 351 { SAFNUM_UNICAST, "Unicast"}, 352 { SAFNUM_MULTICAST, "Multicast"}, 353 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"}, 354 { SAFNUM_LABUNICAST, "labeled Unicast"}, 355 { SAFNUM_TUNNEL, "Tunnel"}, 356 { SAFNUM_VPLS, "VPLS"}, 357 { SAFNUM_MDT, "MDT"}, 358 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"}, 359 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"}, 360 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"}, 361 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"}, 362 { SAFNUM_MULTICAST_VPN, "Multicast VPN"}, 363 { 0, NULL } 364 }; 365 366 /* well-known community */ 367 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01 368 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02 369 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 370 371 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */ 372 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */ 373 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */ 374 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */ 375 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */ 376 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */ 377 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */ 378 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */ 379 /* rfc2547 bgp-mpls-vpns */ 380 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */ 381 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */ 382 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */ 383 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */ 384 385 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */ 386 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */ 387 388 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */ 389 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */ 390 391 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */ 392 393 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 394 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 395 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */ 396 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */ 397 398 399 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */ 400 #define BGP_EXT_COM_EIGRP_GEN 0x8800 401 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801 402 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802 403 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803 404 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804 405 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805 406 407 static const struct tok bgp_extd_comm_flag_values[] = { 408 { 0x8000, "vendor-specific"}, 409 { 0x4000, "non-transitive"}, 410 { 0, NULL}, 411 }; 412 413 static const struct tok bgp_extd_comm_subtype_values[] = { 414 { BGP_EXT_COM_RT_0, "target"}, 415 { BGP_EXT_COM_RT_1, "target"}, 416 { BGP_EXT_COM_RT_2, "target"}, 417 { BGP_EXT_COM_RO_0, "origin"}, 418 { BGP_EXT_COM_RO_1, "origin"}, 419 { BGP_EXT_COM_RO_2, "origin"}, 420 { BGP_EXT_COM_LINKBAND, "link-BW"}, 421 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"}, 422 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"}, 423 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"}, 424 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"}, 425 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"}, 426 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"}, 427 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"}, 428 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"}, 429 { BGP_EXT_COM_L2INFO, "layer2-info"}, 430 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" }, 431 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" }, 432 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" }, 433 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" }, 434 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" }, 435 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" }, 436 { BGP_EXT_COM_SOURCE_AS, "source-AS" }, 437 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"}, 438 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"}, 439 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"}, 440 { 0, NULL}, 441 }; 442 443 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */ 444 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */ 445 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */ 446 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */ 447 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */ 448 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/ 449 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */ 450 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */ 451 452 static const struct tok bgp_extd_comm_ospf_rtype_values[] = { 453 { BGP_OSPF_RTYPE_RTR, "Router" }, 454 { BGP_OSPF_RTYPE_NET, "Network" }, 455 { BGP_OSPF_RTYPE_SUM, "Summary" }, 456 { BGP_OSPF_RTYPE_EXT, "External" }, 457 { BGP_OSPF_RTYPE_NSSA,"NSSA External" }, 458 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" }, 459 { 0, NULL }, 460 }; 461 462 #define TOKBUFSIZE 128 463 static char astostr[20]; 464 465 /* 466 * as_printf 467 * 468 * Convert an AS number into a string and return string pointer. 469 * 470 * Depending on bflag is set or not, AS number is converted into ASDOT notation 471 * or plain number notation. 472 * 473 */ 474 static char * 475 as_printf(netdissect_options *ndo, 476 char *str, int size, u_int asnum) 477 { 478 if (!ndo->ndo_bflag || asnum <= 0xFFFF) { 479 snprintf(str, size, "%u", asnum); 480 } else { 481 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF); 482 } 483 return str; 484 } 485 486 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv; 487 488 int 489 decode_prefix4(netdissect_options *ndo, 490 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 491 { 492 struct in_addr addr; 493 u_int plen, plenbytes; 494 495 ND_TCHECK(pptr[0]); 496 ITEMCHECK(1); 497 plen = pptr[0]; 498 if (32 < plen) 499 return -1; 500 itemlen -= 1; 501 502 memset(&addr, 0, sizeof(addr)); 503 plenbytes = (plen + 7) / 8; 504 ND_TCHECK2(pptr[1], plenbytes); 505 ITEMCHECK(plenbytes); 506 memcpy(&addr, &pptr[1], plenbytes); 507 if (plen % 8) { 508 ((u_char *)&addr)[plenbytes - 1] &= 509 ((0xff00 >> (plen % 8)) & 0xff); 510 } 511 snprintf(buf, buflen, "%s/%d", getname(ndo, (u_char *)&addr), plen); 512 return 1 + plenbytes; 513 514 trunc: 515 return -2; 516 517 badtlv: 518 return -3; 519 } 520 521 static int 522 decode_labeled_prefix4(netdissect_options *ndo, 523 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 524 { 525 struct in_addr addr; 526 u_int plen, plenbytes; 527 528 /* prefix length and label = 4 bytes */ 529 ND_TCHECK2(pptr[0], 4); 530 ITEMCHECK(4); 531 plen = pptr[0]; /* get prefix length */ 532 533 /* this is one of the weirdnesses of rfc3107 534 the label length (actually the label + COS bits) 535 is added to the prefix length; 536 we also do only read out just one label - 537 there is no real application for advertisement of 538 stacked labels in a single BGP message 539 */ 540 541 if (24 > plen) 542 return -1; 543 544 plen-=24; /* adjust prefixlen - labellength */ 545 546 if (32 < plen) 547 return -1; 548 itemlen -= 4; 549 550 memset(&addr, 0, sizeof(addr)); 551 plenbytes = (plen + 7) / 8; 552 ND_TCHECK2(pptr[4], plenbytes); 553 ITEMCHECK(plenbytes); 554 memcpy(&addr, &pptr[4], plenbytes); 555 if (plen % 8) { 556 ((u_char *)&addr)[plenbytes - 1] &= 557 ((0xff00 >> (plen % 8)) & 0xff); 558 } 559 /* the label may get offsetted by 4 bits so lets shift it right */ 560 snprintf(buf, buflen, "%s/%d, label:%u %s", 561 getname(ndo, (u_char *)&addr), 562 plen, 563 EXTRACT_24BITS(pptr+1)>>4, 564 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 565 566 return 4 + plenbytes; 567 568 trunc: 569 return -2; 570 571 badtlv: 572 return -3; 573 } 574 575 /* 576 * bgp_vpn_ip_print 577 * 578 * print an ipv4 or ipv6 address into a buffer dependend on address length. 579 */ 580 static char * 581 bgp_vpn_ip_print(netdissect_options *ndo, 582 const u_char *pptr, u_int addr_length) 583 { 584 585 /* worst case string is s fully formatted v6 address */ 586 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")]; 587 char *pos = addr; 588 589 switch(addr_length) { 590 case (sizeof(struct in_addr) << 3): /* 32 */ 591 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 592 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr)); 593 break; 594 #ifdef INET6 595 case (sizeof(struct in6_addr) << 3): /* 128 */ 596 ND_TCHECK2(pptr[0], sizeof(struct in6_addr)); 597 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr)); 598 break; 599 #endif 600 default: 601 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length); 602 break; 603 } 604 pos += strlen(pos); 605 606 trunc: 607 *(pos) = '\0'; 608 return (addr); 609 } 610 611 /* 612 * bgp_vpn_sg_print 613 * 614 * print an multicast s,g entry into a buffer. 615 * the s,g entry is encoded like this. 616 * 617 * +-----------------------------------+ 618 * | Multicast Source Length (1 octet) | 619 * +-----------------------------------+ 620 * | Multicast Source (Variable) | 621 * +-----------------------------------+ 622 * | Multicast Group Length (1 octet) | 623 * +-----------------------------------+ 624 * | Multicast Group (Variable) | 625 * +-----------------------------------+ 626 * 627 * return the number of bytes read from the wire. 628 */ 629 static int 630 bgp_vpn_sg_print(netdissect_options *ndo, 631 const u_char *pptr, char *buf, u_int buflen) 632 { 633 uint8_t addr_length; 634 u_int total_length, offset; 635 636 total_length = 0; 637 638 /* Source address length, encoded in bits */ 639 ND_TCHECK2(pptr[0], 1); 640 addr_length = *pptr++; 641 642 /* Source address */ 643 ND_TCHECK2(pptr[0], (addr_length >> 3)); 644 total_length += (addr_length >> 3) + 1; 645 offset = strlen(buf); 646 if (addr_length) { 647 snprintf(buf + offset, buflen - offset, ", Source %s", 648 bgp_vpn_ip_print(ndo, pptr, addr_length)); 649 pptr += (addr_length >> 3); 650 } 651 652 /* Group address length, encoded in bits */ 653 ND_TCHECK2(pptr[0], 1); 654 addr_length = *pptr++; 655 656 /* Group address */ 657 ND_TCHECK2(pptr[0], (addr_length >> 3)); 658 total_length += (addr_length >> 3) + 1; 659 offset = strlen(buf); 660 if (addr_length) { 661 snprintf(buf + offset, buflen - offset, ", Group %s", 662 bgp_vpn_ip_print(ndo, pptr, addr_length)); 663 pptr += (addr_length >> 3); 664 } 665 666 trunc: 667 return (total_length); 668 } 669 670 671 /* RDs and RTs share the same semantics 672 * we use bgp_vpn_rd_print for 673 * printing route targets inside a NLRI */ 674 char * 675 bgp_vpn_rd_print(netdissect_options *ndo, 676 const u_char *pptr) 677 { 678 /* allocate space for the largest possible string */ 679 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")]; 680 char *pos = rd; 681 682 /* ok lets load the RD format */ 683 switch (EXTRACT_16BITS(pptr)) { 684 685 /* 2-byte-AS:number fmt*/ 686 case 0: 687 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)", 688 EXTRACT_16BITS(pptr+2), 689 EXTRACT_32BITS(pptr+4), 690 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7)); 691 break; 692 /* IP-address:AS fmt*/ 693 694 case 1: 695 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u", 696 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6)); 697 break; 698 699 /* 4-byte-AS:number fmt*/ 700 case 2: 701 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)", 702 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)), 703 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4), 704 *(pptr+5), EXTRACT_16BITS(pptr+6)); 705 break; 706 default: 707 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format"); 708 break; 709 } 710 pos += strlen(pos); 711 *(pos) = '\0'; 712 return (rd); 713 } 714 715 static int 716 decode_rt_routing_info(netdissect_options *ndo, 717 const u_char *pptr, char *buf, u_int buflen) 718 { 719 uint8_t route_target[8]; 720 u_int plen; 721 722 ND_TCHECK(pptr[0]); 723 plen = pptr[0]; /* get prefix length */ 724 725 if (0 == plen) { 726 snprintf(buf, buflen, "default route target"); 727 return 1; 728 } 729 730 if (32 > plen) 731 return -1; 732 733 plen-=32; /* adjust prefix length */ 734 735 if (64 < plen) 736 return -1; 737 738 memset(&route_target, 0, sizeof(route_target)); 739 ND_TCHECK2(pptr[1], (plen + 7) / 8); 740 memcpy(&route_target, &pptr[1], (plen + 7) / 8); 741 if (plen % 8) { 742 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= 743 ((0xff00 >> (plen % 8)) & 0xff); 744 } 745 snprintf(buf, buflen, "origin AS: %s, route target %s", 746 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)), 747 bgp_vpn_rd_print(ndo, (u_char *)&route_target)); 748 749 return 5 + (plen + 7) / 8; 750 751 trunc: 752 return -2; 753 } 754 755 static int 756 decode_labeled_vpn_prefix4(netdissect_options *ndo, 757 const u_char *pptr, char *buf, u_int buflen) 758 { 759 struct in_addr addr; 760 u_int plen; 761 762 ND_TCHECK(pptr[0]); 763 plen = pptr[0]; /* get prefix length */ 764 765 if ((24+64) > plen) 766 return -1; 767 768 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 769 770 if (32 < plen) 771 return -1; 772 773 memset(&addr, 0, sizeof(addr)); 774 ND_TCHECK2(pptr[12], (plen + 7) / 8); 775 memcpy(&addr, &pptr[12], (plen + 7) / 8); 776 if (plen % 8) { 777 ((u_char *)&addr)[(plen + 7) / 8 - 1] &= 778 ((0xff00 >> (plen % 8)) & 0xff); 779 } 780 /* the label may get offsetted by 4 bits so lets shift it right */ 781 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 782 bgp_vpn_rd_print(ndo, pptr+4), 783 getname(ndo, (u_char *)&addr), 784 plen, 785 EXTRACT_24BITS(pptr+1)>>4, 786 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 787 788 return 12 + (plen + 7) / 8; 789 790 trunc: 791 return -2; 792 } 793 794 /* 795 * +-------------------------------+ 796 * | | 797 * | RD:IPv4-address (12 octets) | 798 * | | 799 * +-------------------------------+ 800 * | MDT Group-address (4 octets) | 801 * +-------------------------------+ 802 */ 803 804 #define MDT_VPN_NLRI_LEN 16 805 806 static int 807 decode_mdt_vpn_nlri(netdissect_options *ndo, 808 const u_char *pptr, char *buf, u_int buflen) 809 { 810 811 const u_char *rd; 812 const u_char *vpn_ip; 813 814 ND_TCHECK(pptr[0]); 815 816 /* if the NLRI is not predefined length, quit.*/ 817 if (*pptr != MDT_VPN_NLRI_LEN * 8) 818 return -1; 819 pptr++; 820 821 /* RD */ 822 ND_TCHECK2(pptr[0], 8); 823 rd = pptr; 824 pptr+=8; 825 826 /* IPv4 address */ 827 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 828 vpn_ip = pptr; 829 pptr+=sizeof(struct in_addr); 830 831 /* MDT Group Address */ 832 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 833 834 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s", 835 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr)); 836 837 return MDT_VPN_NLRI_LEN + 1; 838 839 trunc: 840 841 return -2; 842 } 843 844 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1 845 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2 846 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3 847 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4 848 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5 849 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6 850 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7 851 852 static const struct tok bgp_multicast_vpn_route_type_values[] = { 853 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"}, 854 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"}, 855 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"}, 856 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"}, 857 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"}, 858 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"}, 859 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"}, 860 }; 861 862 static int 863 decode_multicast_vpn(netdissect_options *ndo, 864 const u_char *pptr, char *buf, u_int buflen) 865 { 866 uint8_t route_type, route_length, addr_length, sg_length; 867 u_int offset; 868 869 ND_TCHECK2(pptr[0], 2); 870 route_type = *pptr++; 871 route_length = *pptr++; 872 873 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", 874 tok2str(bgp_multicast_vpn_route_type_values, 875 "Unknown", route_type), 876 route_type, route_length); 877 878 switch(route_type) { 879 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: 880 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 881 offset = strlen(buf); 882 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", 883 bgp_vpn_rd_print(ndo, pptr), 884 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN, 885 (route_length - BGP_VPN_RD_LEN) << 3)); 886 break; 887 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: 888 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); 889 offset = strlen(buf); 890 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 891 bgp_vpn_rd_print(ndo, pptr), 892 as_printf(ndo, astostr, sizeof(astostr), 893 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 894 break; 895 896 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: 897 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 898 offset = strlen(buf); 899 snprintf(buf + offset, buflen - offset, ", RD: %s", 900 bgp_vpn_rd_print(ndo, pptr)); 901 pptr += BGP_VPN_RD_LEN; 902 903 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen); 904 addr_length = route_length - sg_length; 905 906 ND_TCHECK2(pptr[0], addr_length); 907 offset = strlen(buf); 908 snprintf(buf + offset, buflen - offset, ", Originator %s", 909 bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); 910 break; 911 912 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: 913 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 914 offset = strlen(buf); 915 snprintf(buf + offset, buflen - offset, ", RD: %s", 916 bgp_vpn_rd_print(ndo, pptr)); 917 pptr += BGP_VPN_RD_LEN; 918 919 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 920 break; 921 922 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ 923 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: 924 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 925 offset = strlen(buf); 926 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 927 bgp_vpn_rd_print(ndo, pptr), 928 as_printf(ndo, astostr, sizeof(astostr), 929 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 930 pptr += BGP_VPN_RD_LEN; 931 932 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 933 break; 934 935 /* 936 * no per route-type printing yet. 937 */ 938 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: 939 default: 940 break; 941 } 942 943 return route_length + 2; 944 945 trunc: 946 return -2; 947 } 948 949 /* 950 * As I remember, some versions of systems have an snprintf() that 951 * returns -1 if the buffer would have overflowed. If the return 952 * value is negative, set buflen to 0, to indicate that we've filled 953 * the buffer up. 954 * 955 * If the return value is greater than buflen, that means that 956 * the buffer would have overflowed; again, set buflen to 0 in 957 * that case. 958 */ 959 #define UPDATE_BUF_BUFLEN(buf, buflen, strlen) \ 960 if (strlen<0) \ 961 buflen=0; \ 962 else if ((u_int)strlen>buflen) \ 963 buflen=0; \ 964 else { \ 965 buflen-=strlen; \ 966 buf+=strlen; \ 967 } 968 969 static int 970 decode_labeled_vpn_l2(netdissect_options *ndo, 971 const u_char *pptr, char *buf, u_int buflen) 972 { 973 int plen,tlen,strlen,tlv_type,tlv_len,ttlv_len; 974 975 ND_TCHECK2(pptr[0], 2); 976 plen=EXTRACT_16BITS(pptr); 977 tlen=plen; 978 pptr+=2; 979 /* Old and new L2VPN NLRI share AFI/SAFI 980 * -> Assume a 12 Byte-length NLRI is auto-discovery-only 981 * and > 17 as old format. Complain for the middle case 982 */ 983 if (plen==12) { 984 /* assume AD-only with RD, BGPNH */ 985 ND_TCHECK2(pptr[0],12); 986 buf[0]='\0'; 987 strlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s", 988 bgp_vpn_rd_print(ndo, pptr), 989 /* need something like getname(ndo, ) here */ 990 getname(ndo, pptr+8) 991 ); 992 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 993 pptr+=12; 994 tlen-=12; 995 return plen; 996 } else if (plen>17) { 997 /* assume old format */ 998 /* RD, ID, LBLKOFF, LBLBASE */ 999 1000 ND_TCHECK2(pptr[0],15); 1001 buf[0]='\0'; 1002 strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", 1003 bgp_vpn_rd_print(ndo, pptr), 1004 EXTRACT_16BITS(pptr+8), 1005 EXTRACT_16BITS(pptr+10), 1006 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ 1007 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1008 pptr+=15; 1009 tlen-=15; 1010 1011 /* ok now the variable part - lets read out TLVs*/ 1012 while (tlen>0) { 1013 if (tlen < 3) 1014 return -1; 1015 ND_TCHECK2(pptr[0], 3); 1016 tlv_type=*pptr++; 1017 tlv_len=EXTRACT_16BITS(pptr); 1018 ttlv_len=tlv_len; 1019 pptr+=2; 1020 1021 switch(tlv_type) { 1022 case 1: 1023 if (buflen!=0) { 1024 strlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", 1025 tlv_type, 1026 tlv_len); 1027 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1028 } 1029 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */ 1030 while (ttlv_len>0) { 1031 ND_TCHECK(pptr[0]); 1032 if (buflen!=0) { 1033 strlen=snprintf(buf,buflen, "%02x",*pptr++); 1034 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1035 } 1036 ttlv_len--; 1037 } 1038 break; 1039 default: 1040 if (buflen!=0) { 1041 strlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", 1042 tlv_type, 1043 tlv_len); 1044 UPDATE_BUF_BUFLEN(buf, buflen, strlen); 1045 } 1046 break; 1047 } 1048 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */ 1049 } 1050 return plen+2; 1051 1052 } else { 1053 /* complain bitterly ? */ 1054 /* fall through */ 1055 goto trunc; 1056 } 1057 1058 trunc: 1059 return -2; 1060 } 1061 1062 #ifdef INET6 1063 int 1064 decode_prefix6(netdissect_options *ndo, 1065 const u_char *pd, u_int itemlen, char *buf, u_int buflen) 1066 { 1067 struct in6_addr addr; 1068 u_int plen, plenbytes; 1069 1070 ND_TCHECK(pd[0]); 1071 ITEMCHECK(1); 1072 plen = pd[0]; 1073 if (128 < plen) 1074 return -1; 1075 itemlen -= 1; 1076 1077 memset(&addr, 0, sizeof(addr)); 1078 plenbytes = (plen + 7) / 8; 1079 ND_TCHECK2(pd[1], plenbytes); 1080 ITEMCHECK(plenbytes); 1081 memcpy(&addr, &pd[1], plenbytes); 1082 if (plen % 8) { 1083 addr.s6_addr[plenbytes - 1] &= 1084 ((0xff00 >> (plen % 8)) & 0xff); 1085 } 1086 snprintf(buf, buflen, "%s/%d", getname6(ndo, (u_char *)&addr), plen); 1087 return 1 + plenbytes; 1088 1089 trunc: 1090 return -2; 1091 1092 badtlv: 1093 return -3; 1094 } 1095 1096 static int 1097 decode_labeled_prefix6(netdissect_options *ndo, 1098 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 1099 { 1100 struct in6_addr addr; 1101 u_int plen, plenbytes; 1102 1103 /* prefix length and label = 4 bytes */ 1104 ND_TCHECK2(pptr[0], 4); 1105 ITEMCHECK(4); 1106 plen = pptr[0]; /* get prefix length */ 1107 1108 if (24 > plen) 1109 return -1; 1110 1111 plen-=24; /* adjust prefixlen - labellength */ 1112 1113 if (128 < plen) 1114 return -1; 1115 itemlen -= 4; 1116 1117 memset(&addr, 0, sizeof(addr)); 1118 plenbytes = (plen + 7) / 8; 1119 ND_TCHECK2(pptr[4], plenbytes); 1120 memcpy(&addr, &pptr[4], plenbytes); 1121 if (plen % 8) { 1122 addr.s6_addr[plenbytes - 1] &= 1123 ((0xff00 >> (plen % 8)) & 0xff); 1124 } 1125 /* the label may get offsetted by 4 bits so lets shift it right */ 1126 snprintf(buf, buflen, "%s/%d, label:%u %s", 1127 getname6(ndo, (u_char *)&addr), 1128 plen, 1129 EXTRACT_24BITS(pptr+1)>>4, 1130 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1131 1132 return 4 + plenbytes; 1133 1134 trunc: 1135 return -2; 1136 1137 badtlv: 1138 return -3; 1139 } 1140 1141 static int 1142 decode_labeled_vpn_prefix6(netdissect_options *ndo, 1143 const u_char *pptr, char *buf, u_int buflen) 1144 { 1145 struct in6_addr addr; 1146 u_int plen; 1147 1148 ND_TCHECK(pptr[0]); 1149 plen = pptr[0]; /* get prefix length */ 1150 1151 if ((24+64) > plen) 1152 return -1; 1153 1154 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1155 1156 if (128 < plen) 1157 return -1; 1158 1159 memset(&addr, 0, sizeof(addr)); 1160 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1161 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1162 if (plen % 8) { 1163 addr.s6_addr[(plen + 7) / 8 - 1] &= 1164 ((0xff00 >> (plen % 8)) & 0xff); 1165 } 1166 /* the label may get offsetted by 4 bits so lets shift it right */ 1167 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1168 bgp_vpn_rd_print(ndo, pptr+4), 1169 getname6(ndo, (u_char *)&addr), 1170 plen, 1171 EXTRACT_24BITS(pptr+1)>>4, 1172 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1173 1174 return 12 + (plen + 7) / 8; 1175 1176 trunc: 1177 return -2; 1178 } 1179 #endif 1180 1181 static int 1182 decode_clnp_prefix(netdissect_options *ndo, 1183 const u_char *pptr, char *buf, u_int buflen) 1184 { 1185 uint8_t addr[19]; 1186 u_int plen; 1187 1188 ND_TCHECK(pptr[0]); 1189 plen = pptr[0]; /* get prefix length */ 1190 1191 if (152 < plen) 1192 return -1; 1193 1194 memset(&addr, 0, sizeof(addr)); 1195 ND_TCHECK2(pptr[4], (plen + 7) / 8); 1196 memcpy(&addr, &pptr[4], (plen + 7) / 8); 1197 if (plen % 8) { 1198 addr[(plen + 7) / 8 - 1] &= 1199 ((0xff00 >> (plen % 8)) & 0xff); 1200 } 1201 snprintf(buf, buflen, "%s/%d", 1202 isonsap_string(addr,(plen + 7) / 8), 1203 plen); 1204 1205 return 1 + (plen + 7) / 8; 1206 1207 trunc: 1208 return -2; 1209 } 1210 1211 static int 1212 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo, 1213 const u_char *pptr, char *buf, u_int buflen) 1214 { 1215 uint8_t addr[19]; 1216 u_int plen; 1217 1218 ND_TCHECK(pptr[0]); 1219 plen = pptr[0]; /* get prefix length */ 1220 1221 if ((24+64) > plen) 1222 return -1; 1223 1224 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1225 1226 if (152 < plen) 1227 return -1; 1228 1229 memset(&addr, 0, sizeof(addr)); 1230 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1231 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1232 if (plen % 8) { 1233 addr[(plen + 7) / 8 - 1] &= 1234 ((0xff00 >> (plen % 8)) & 0xff); 1235 } 1236 /* the label may get offsetted by 4 bits so lets shift it right */ 1237 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1238 bgp_vpn_rd_print(ndo, pptr+4), 1239 isonsap_string(addr,(plen + 7) / 8), 1240 plen, 1241 EXTRACT_24BITS(pptr+1)>>4, 1242 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1243 1244 return 12 + (plen + 7) / 8; 1245 1246 trunc: 1247 return -2; 1248 } 1249 1250 /* 1251 * bgp_attr_get_as_size 1252 * 1253 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as 1254 * both Old speakers that do not support 4 byte AS, and the new speakers that do 1255 * support, exchange AS-Path with the same path-attribute type value 0x02. 1256 */ 1257 static int 1258 bgp_attr_get_as_size(netdissect_options *ndo, 1259 uint8_t bgpa_type, const u_char *pptr, int len) 1260 { 1261 const u_char *tptr = pptr; 1262 1263 /* 1264 * If the path attribute is the optional AS4 path type, then we already 1265 * know, that ASs must be encoded in 4 byte format. 1266 */ 1267 if (bgpa_type == BGPTYPE_AS4_PATH) { 1268 return 4; 1269 } 1270 1271 /* 1272 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path 1273 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes 1274 * each. 1275 */ 1276 while (tptr < pptr + len) { 1277 ND_TCHECK(tptr[0]); 1278 1279 /* 1280 * If we do not find a valid segment type, our guess might be wrong. 1281 */ 1282 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) { 1283 goto trunc; 1284 } 1285 ND_TCHECK(tptr[1]); 1286 tptr += 2 + tptr[1] * 2; 1287 } 1288 1289 /* 1290 * If we correctly reached end of the AS path attribute data content, 1291 * then most likely ASs were indeed encoded as 2 bytes. 1292 */ 1293 if (tptr == pptr + len) { 1294 return 2; 1295 } 1296 1297 trunc: 1298 1299 /* 1300 * We can come here, either we did not have enough data, or if we 1301 * try to decode 4 byte ASs in 2 byte format. Either way, return 4, 1302 * so that calller can try to decode each AS as of 4 bytes. If indeed 1303 * there was not enough data, it will crib and end the parse anyways. 1304 */ 1305 return 4; 1306 } 1307 1308 static int 1309 bgp_attr_print(netdissect_options *ndo, 1310 u_int atype, const u_char *pptr, u_int len) 1311 { 1312 int i; 1313 uint16_t af; 1314 uint8_t safi, snpa, nhlen; 1315 union { /* copy buffer for bandwidth values */ 1316 float f; 1317 uint32_t i; 1318 } bw; 1319 int advance; 1320 u_int tlen; 1321 const u_char *tptr; 1322 char buf[MAXHOSTNAMELEN + 100]; 1323 char tokbuf[TOKBUFSIZE]; 1324 int as_size; 1325 1326 tptr = pptr; 1327 tlen=len; 1328 1329 switch (atype) { 1330 case BGPTYPE_ORIGIN: 1331 if (len != 1) 1332 ND_PRINT((ndo, "invalid len")); 1333 else { 1334 ND_TCHECK(*tptr); 1335 ND_PRINT((ndo, "%s", tok2strbuf(bgp_origin_values, 1336 "Unknown Origin Typecode", 1337 tptr[0], 1338 tokbuf, sizeof(tokbuf)))); 1339 } 1340 break; 1341 1342 1343 /* 1344 * Process AS4 byte path and AS2 byte path attributes here. 1345 */ 1346 case BGPTYPE_AS4_PATH: 1347 case BGPTYPE_AS_PATH: 1348 if (len % 2) { 1349 ND_PRINT((ndo, "invalid len")); 1350 break; 1351 } 1352 if (!len) { 1353 ND_PRINT((ndo, "empty")); 1354 break; 1355 } 1356 1357 /* 1358 * BGP updates exchanged between New speakers that support 4 1359 * byte AS, ASs are always encoded in 4 bytes. There is no 1360 * definitive way to find this, just by the packet's 1361 * contents. So, check for packet's TLV's sanity assuming 1362 * 2 bytes first, and it does not pass, assume that ASs are 1363 * encoded in 4 bytes format and move on. 1364 */ 1365 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); 1366 1367 while (tptr < pptr + len) { 1368 ND_TCHECK(tptr[0]); 1369 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_open_values, 1370 "?", tptr[0], 1371 tokbuf, sizeof(tokbuf)))); 1372 for (i = 0; i < tptr[1] * as_size; i += as_size) { 1373 ND_TCHECK2(tptr[2 + i], as_size); 1374 ND_PRINT((ndo, "%s ", 1375 as_printf(ndo, astostr, sizeof(astostr), 1376 as_size == 2 ? 1377 EXTRACT_16BITS(&tptr[2 + i]) : 1378 EXTRACT_32BITS(&tptr[2 + i])))); 1379 } 1380 ND_TCHECK(tptr[0]); 1381 ND_PRINT((ndo, "%s", tok2strbuf(bgp_as_path_segment_close_values, 1382 "?", tptr[0], 1383 tokbuf, sizeof(tokbuf)))); 1384 ND_TCHECK(tptr[1]); 1385 tptr += 2 + tptr[1] * as_size; 1386 } 1387 break; 1388 case BGPTYPE_NEXT_HOP: 1389 if (len != 4) 1390 ND_PRINT((ndo, "invalid len")); 1391 else { 1392 ND_TCHECK2(tptr[0], 4); 1393 ND_PRINT((ndo, "%s", getname(ndo, tptr))); 1394 } 1395 break; 1396 case BGPTYPE_MULTI_EXIT_DISC: 1397 case BGPTYPE_LOCAL_PREF: 1398 if (len != 4) 1399 ND_PRINT((ndo, "invalid len")); 1400 else { 1401 ND_TCHECK2(tptr[0], 4); 1402 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr))); 1403 } 1404 break; 1405 case BGPTYPE_ATOMIC_AGGREGATE: 1406 if (len != 0) 1407 ND_PRINT((ndo, "invalid len")); 1408 break; 1409 case BGPTYPE_AGGREGATOR: 1410 1411 /* 1412 * Depending on the AS encoded is of 2 bytes or of 4 bytes, 1413 * the length of this PA can be either 6 bytes or 8 bytes. 1414 */ 1415 if (len != 6 && len != 8) { 1416 ND_PRINT((ndo, "invalid len")); 1417 break; 1418 } 1419 ND_TCHECK2(tptr[0], len); 1420 if (len == 6) { 1421 ND_PRINT((ndo, " AS #%s, origin %s", 1422 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)), 1423 getname(ndo, tptr + 2))); 1424 } else { 1425 ND_PRINT((ndo, " AS #%s, origin %s", 1426 as_printf(ndo, astostr, sizeof(astostr), 1427 EXTRACT_32BITS(tptr)), getname(ndo, tptr + 4))); 1428 } 1429 break; 1430 case BGPTYPE_AGGREGATOR4: 1431 if (len != 8) { 1432 ND_PRINT((ndo, "invalid len")); 1433 break; 1434 } 1435 ND_TCHECK2(tptr[0], 8); 1436 ND_PRINT((ndo, " AS #%s, origin %s", 1437 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)), 1438 getname(ndo, tptr + 4))); 1439 break; 1440 case BGPTYPE_COMMUNITIES: 1441 if (len % 4) { 1442 ND_PRINT((ndo, "invalid len")); 1443 break; 1444 } 1445 while (tlen>0) { 1446 uint32_t comm; 1447 ND_TCHECK2(tptr[0], 4); 1448 comm = EXTRACT_32BITS(tptr); 1449 switch (comm) { 1450 case BGP_COMMUNITY_NO_EXPORT: 1451 ND_PRINT((ndo, " NO_EXPORT")); 1452 break; 1453 case BGP_COMMUNITY_NO_ADVERT: 1454 ND_PRINT((ndo, " NO_ADVERTISE")); 1455 break; 1456 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: 1457 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED")); 1458 break; 1459 default: 1460 ND_PRINT((ndo, "%u:%u%s", 1461 (comm >> 16) & 0xffff, 1462 comm & 0xffff, 1463 (tlen>4) ? ", " : "")); 1464 break; 1465 } 1466 tlen -=4; 1467 tptr +=4; 1468 } 1469 break; 1470 case BGPTYPE_ORIGINATOR_ID: 1471 if (len != 4) { 1472 ND_PRINT((ndo, "invalid len")); 1473 break; 1474 } 1475 ND_TCHECK2(tptr[0], 4); 1476 ND_PRINT((ndo, "%s",getname(ndo, tptr))); 1477 break; 1478 case BGPTYPE_CLUSTER_LIST: 1479 if (len % 4) { 1480 ND_PRINT((ndo, "invalid len")); 1481 break; 1482 } 1483 while (tlen>0) { 1484 ND_TCHECK2(tptr[0], 4); 1485 ND_PRINT((ndo, "%s%s", 1486 getname(ndo, tptr), 1487 (tlen>4) ? ", " : "")); 1488 tlen -=4; 1489 tptr +=4; 1490 } 1491 break; 1492 case BGPTYPE_MP_REACH_NLRI: 1493 ND_TCHECK2(tptr[0], 3); 1494 af = EXTRACT_16BITS(tptr); 1495 safi = tptr[2]; 1496 1497 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1498 tok2strbuf(af_values, "Unknown AFI", af, 1499 tokbuf, sizeof(tokbuf)), 1500 af, 1501 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1502 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi, 1503 tokbuf, sizeof(tokbuf)), 1504 safi)); 1505 1506 switch(af<<8 | safi) { 1507 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1508 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1509 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1510 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1511 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1512 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1513 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1514 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1515 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1516 case (AFNUM_INET<<8 | SAFNUM_MDT): 1517 #ifdef INET6 1518 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1519 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1520 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1521 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1522 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1523 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1524 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1525 #endif 1526 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1527 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1528 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1529 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1530 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1531 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1532 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1533 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1534 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1535 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1536 break; 1537 default: 1538 ND_TCHECK2(tptr[0], tlen); 1539 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1540 if (ndo->ndo_vflag <= 1) 1541 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1542 goto done; 1543 break; 1544 } 1545 1546 tptr +=3; 1547 1548 ND_TCHECK(tptr[0]); 1549 nhlen = tptr[0]; 1550 tlen = nhlen; 1551 tptr++; 1552 1553 if (tlen) { 1554 int nnh = 0; 1555 ND_PRINT((ndo, "\n\t nexthop: ")); 1556 while (tlen > 0) { 1557 if ( nnh++ > 0 ) { 1558 ND_PRINT((ndo, ", " )); 1559 } 1560 switch(af<<8 | safi) { 1561 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1562 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1563 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1564 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1565 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1566 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1567 case (AFNUM_INET<<8 | SAFNUM_MDT): 1568 if (tlen < (int)sizeof(struct in_addr)) { 1569 ND_PRINT((ndo, "invalid len")); 1570 tlen = 0; 1571 } else { 1572 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1573 ND_PRINT((ndo, "%s",getname(ndo, tptr))); 1574 tlen -= sizeof(struct in_addr); 1575 tptr += sizeof(struct in_addr); 1576 } 1577 break; 1578 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1579 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1580 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1581 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { 1582 ND_PRINT((ndo, "invalid len")); 1583 tlen = 0; 1584 } else { 1585 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1586 ND_PRINT((ndo, "RD: %s, %s", 1587 bgp_vpn_rd_print(ndo, tptr), 1588 getname(ndo, tptr+BGP_VPN_RD_LEN))); 1589 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1590 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1591 } 1592 break; 1593 #ifdef INET6 1594 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1595 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1596 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1597 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1598 if (tlen < (int)sizeof(struct in6_addr)) { 1599 ND_PRINT((ndo, "invalid len")); 1600 tlen = 0; 1601 } else { 1602 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)); 1603 ND_PRINT((ndo, "%s", getname6(ndo, tptr))); 1604 tlen -= sizeof(struct in6_addr); 1605 tptr += sizeof(struct in6_addr); 1606 } 1607 break; 1608 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1609 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1610 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1611 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { 1612 ND_PRINT((ndo, "invalid len")); 1613 tlen = 0; 1614 } else { 1615 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1616 ND_PRINT((ndo, "RD: %s, %s", 1617 bgp_vpn_rd_print(ndo, tptr), 1618 getname6(ndo, tptr+BGP_VPN_RD_LEN))); 1619 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1620 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1621 } 1622 break; 1623 #endif 1624 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1625 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1626 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1627 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1628 if (tlen < (int)sizeof(struct in_addr)) { 1629 ND_PRINT((ndo, "invalid len")); 1630 tlen = 0; 1631 } else { 1632 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1633 ND_PRINT((ndo, "%s", getname(ndo, tptr))); 1634 tlen -= (sizeof(struct in_addr)); 1635 tptr += (sizeof(struct in_addr)); 1636 } 1637 break; 1638 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1639 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1640 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1641 ND_TCHECK2(tptr[0], tlen); 1642 ND_PRINT((ndo, "%s", isonsap_string(tptr, tlen))); 1643 tptr += tlen; 1644 tlen = 0; 1645 break; 1646 1647 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1648 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1649 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1650 if (tlen < BGP_VPN_RD_LEN+1) { 1651 ND_PRINT((ndo, "invalid len")); 1652 tlen = 0; 1653 } else { 1654 ND_TCHECK2(tptr[0], tlen); 1655 ND_PRINT((ndo, "RD: %s, %s", 1656 bgp_vpn_rd_print(ndo, tptr), 1657 isonsap_string(tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN))); 1658 /* rfc986 mapped IPv4 address ? */ 1659 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601) 1660 ND_PRINT((ndo, " = %s", getname(ndo, tptr+BGP_VPN_RD_LEN+4))); 1661 #ifdef INET6 1662 /* rfc1888 mapped IPv6 address ? */ 1663 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000) 1664 ND_PRINT((ndo, " = %s", getname6(ndo, tptr+BGP_VPN_RD_LEN+3))); 1665 #endif 1666 tptr += tlen; 1667 tlen = 0; 1668 } 1669 break; 1670 default: 1671 ND_TCHECK2(tptr[0], tlen); 1672 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi)); 1673 if (ndo->ndo_vflag <= 1) 1674 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1675 tptr += tlen; 1676 tlen = 0; 1677 goto done; 1678 break; 1679 } 1680 } 1681 } 1682 ND_PRINT((ndo, ", nh-length: %u", nhlen)); 1683 tptr += tlen; 1684 1685 ND_TCHECK(tptr[0]); 1686 snpa = tptr[0]; 1687 tptr++; 1688 1689 if (snpa) { 1690 ND_PRINT((ndo, "\n\t %u SNPA", snpa)); 1691 for (/*nothing*/; snpa > 0; snpa--) { 1692 ND_TCHECK(tptr[0]); 1693 ND_PRINT((ndo, "\n\t %d bytes", tptr[0])); 1694 tptr += tptr[0] + 1; 1695 } 1696 } else { 1697 ND_PRINT((ndo, ", no SNPA")); 1698 } 1699 1700 while (len - (tptr - pptr) > 0) { 1701 switch (af<<8 | safi) { 1702 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1703 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1704 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1705 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1706 if (advance == -1) 1707 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1708 else if (advance == -2) 1709 goto trunc; 1710 else if (advance == -3) 1711 break; /* bytes left, but not enough */ 1712 else 1713 ND_PRINT((ndo, "\n\t %s", buf)); 1714 break; 1715 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1716 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1717 if (advance == -1) 1718 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1719 else if (advance == -2) 1720 goto trunc; 1721 else if (advance == -3) 1722 break; /* bytes left, but not enough */ 1723 else 1724 ND_PRINT((ndo, "\n\t %s", buf)); 1725 break; 1726 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1727 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1728 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1729 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1730 if (advance == -1) 1731 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1732 else if (advance == -2) 1733 goto trunc; 1734 else 1735 ND_PRINT((ndo, "\n\t %s", buf)); 1736 break; 1737 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1738 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf)); 1739 if (advance == -1) 1740 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1741 else if (advance == -2) 1742 goto trunc; 1743 else 1744 ND_PRINT((ndo, "\n\t %s", buf)); 1745 break; 1746 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1747 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1748 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 1749 if (advance == -1) 1750 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1751 else if (advance == -2) 1752 goto trunc; 1753 else 1754 ND_PRINT((ndo, "\n\t %s", buf)); 1755 break; 1756 1757 case (AFNUM_INET<<8 | SAFNUM_MDT): 1758 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 1759 if (advance == -1) 1760 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1761 else if (advance == -2) 1762 goto trunc; 1763 else 1764 ND_PRINT((ndo, "\n\t %s", buf)); 1765 break; 1766 #ifdef INET6 1767 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1768 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1769 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1770 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1771 if (advance == -1) 1772 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1773 else if (advance == -2) 1774 goto trunc; 1775 else if (advance == -3) 1776 break; /* bytes left, but not enough */ 1777 else 1778 ND_PRINT((ndo, "\n\t %s", buf)); 1779 break; 1780 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1781 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1782 if (advance == -1) 1783 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1784 else if (advance == -2) 1785 goto trunc; 1786 else if (advance == -3) 1787 break; /* bytes left, but not enough */ 1788 else 1789 ND_PRINT((ndo, "\n\t %s", buf)); 1790 break; 1791 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1792 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1793 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1794 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1795 if (advance == -1) 1796 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1797 else if (advance == -2) 1798 goto trunc; 1799 else 1800 ND_PRINT((ndo, "\n\t %s", buf)); 1801 break; 1802 #endif 1803 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1804 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1805 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1806 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1807 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1808 if (advance == -1) 1809 ND_PRINT((ndo, "\n\t (illegal length)")); 1810 else if (advance == -2) 1811 goto trunc; 1812 else 1813 ND_PRINT((ndo, "\n\t %s", buf)); 1814 break; 1815 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1816 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1817 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1818 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1819 if (advance == -1) 1820 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1821 else if (advance == -2) 1822 goto trunc; 1823 else 1824 ND_PRINT((ndo, "\n\t %s", buf)); 1825 break; 1826 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1827 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1828 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1829 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1830 if (advance == -1) 1831 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1832 else if (advance == -2) 1833 goto trunc; 1834 else 1835 ND_PRINT((ndo, "\n\t %s", buf)); 1836 break; 1837 default: 1838 ND_TCHECK2(*tptr,tlen); 1839 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1840 if (ndo->ndo_vflag <= 1) 1841 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1842 advance = 0; 1843 tptr = pptr + len; 1844 break; 1845 } 1846 if (advance < 0) 1847 break; 1848 tptr += advance; 1849 } 1850 done: 1851 break; 1852 1853 case BGPTYPE_MP_UNREACH_NLRI: 1854 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE); 1855 af = EXTRACT_16BITS(tptr); 1856 safi = tptr[2]; 1857 1858 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1859 tok2strbuf(af_values, "Unknown AFI", af, 1860 tokbuf, sizeof(tokbuf)), 1861 af, 1862 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1863 tok2strbuf(bgp_safi_values, "Unknown SAFI", safi, 1864 tokbuf, sizeof(tokbuf)), 1865 safi)); 1866 1867 if (len == BGP_MP_NLRI_MINSIZE) 1868 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 1869 1870 tptr += 3; 1871 1872 while (len - (tptr - pptr) > 0) { 1873 switch (af<<8 | safi) { 1874 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1875 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1876 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1877 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1878 if (advance == -1) 1879 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1880 else if (advance == -2) 1881 goto trunc; 1882 else if (advance == -3) 1883 break; /* bytes left, but not enough */ 1884 else 1885 ND_PRINT((ndo, "\n\t %s", buf)); 1886 break; 1887 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1888 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1889 if (advance == -1) 1890 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1891 else if (advance == -2) 1892 goto trunc; 1893 else if (advance == -3) 1894 break; /* bytes left, but not enough */ 1895 else 1896 ND_PRINT((ndo, "\n\t %s", buf)); 1897 break; 1898 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1899 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1900 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1901 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1902 if (advance == -1) 1903 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1904 else if (advance == -2) 1905 goto trunc; 1906 else 1907 ND_PRINT((ndo, "\n\t %s", buf)); 1908 break; 1909 #ifdef INET6 1910 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1911 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1912 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1913 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1914 if (advance == -1) 1915 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1916 else if (advance == -2) 1917 goto trunc; 1918 else if (advance == -3) 1919 break; /* bytes left, but not enough */ 1920 else 1921 ND_PRINT((ndo, "\n\t %s", buf)); 1922 break; 1923 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1924 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1925 if (advance == -1) 1926 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1927 else if (advance == -2) 1928 goto trunc; 1929 else if (advance == -3) 1930 break; /* bytes left, but not enough */ 1931 else 1932 ND_PRINT((ndo, "\n\t %s", buf)); 1933 break; 1934 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1935 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1936 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1937 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1938 if (advance == -1) 1939 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1940 else if (advance == -2) 1941 goto trunc; 1942 else 1943 ND_PRINT((ndo, "\n\t %s", buf)); 1944 break; 1945 #endif 1946 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1947 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1948 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1949 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1950 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1951 if (advance == -1) 1952 ND_PRINT((ndo, "\n\t (illegal length)")); 1953 else if (advance == -2) 1954 goto trunc; 1955 else 1956 ND_PRINT((ndo, "\n\t %s", buf)); 1957 break; 1958 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1959 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1960 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1961 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1962 if (advance == -1) 1963 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1964 else if (advance == -2) 1965 goto trunc; 1966 else 1967 ND_PRINT((ndo, "\n\t %s", buf)); 1968 break; 1969 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1970 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1971 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1972 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1973 if (advance == -1) 1974 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1975 else if (advance == -2) 1976 goto trunc; 1977 else 1978 ND_PRINT((ndo, "\n\t %s", buf)); 1979 break; 1980 case (AFNUM_INET<<8 | SAFNUM_MDT): 1981 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 1982 if (advance == -1) 1983 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1984 else if (advance == -2) 1985 goto trunc; 1986 else 1987 ND_PRINT((ndo, "\n\t %s", buf)); 1988 break; 1989 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1990 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1991 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 1992 if (advance == -1) 1993 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1994 else if (advance == -2) 1995 goto trunc; 1996 else 1997 ND_PRINT((ndo, "\n\t %s", buf)); 1998 break; 1999 default: 2000 ND_TCHECK2(*(tptr-3),tlen); 2001 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi)); 2002 if (ndo->ndo_vflag <= 1) 2003 print_unknown_data(ndo, tptr-3, "\n\t ", tlen); 2004 advance = 0; 2005 tptr = pptr + len; 2006 break; 2007 } 2008 if (advance < 0) 2009 break; 2010 tptr += advance; 2011 } 2012 break; 2013 case BGPTYPE_EXTD_COMMUNITIES: 2014 if (len % 8) { 2015 ND_PRINT((ndo, "invalid len")); 2016 break; 2017 } 2018 while (tlen>0) { 2019 uint16_t extd_comm; 2020 2021 ND_TCHECK2(tptr[0], 2); 2022 extd_comm=EXTRACT_16BITS(tptr); 2023 2024 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]", 2025 tok2strbuf(bgp_extd_comm_subtype_values, 2026 "unknown extd community typecode", 2027 extd_comm, tokbuf, sizeof(tokbuf)), 2028 extd_comm, 2029 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm))); 2030 2031 ND_TCHECK2(*(tptr+2), 6); 2032 switch(extd_comm) { 2033 case BGP_EXT_COM_RT_0: 2034 case BGP_EXT_COM_RO_0: 2035 case BGP_EXT_COM_L2VPN_RT_0: 2036 ND_PRINT((ndo, ": %u:%u (= %s)", 2037 EXTRACT_16BITS(tptr+2), 2038 EXTRACT_32BITS(tptr+4), 2039 getname(ndo, tptr+4))); 2040 break; 2041 case BGP_EXT_COM_RT_1: 2042 case BGP_EXT_COM_RO_1: 2043 case BGP_EXT_COM_L2VPN_RT_1: 2044 case BGP_EXT_COM_VRF_RT_IMP: 2045 ND_PRINT((ndo, ": %s:%u", 2046 getname(ndo, tptr+2), 2047 EXTRACT_16BITS(tptr+6))); 2048 break; 2049 case BGP_EXT_COM_RT_2: 2050 case BGP_EXT_COM_RO_2: 2051 ND_PRINT((ndo, ": %s:%u", 2052 as_printf(ndo, astostr, sizeof(astostr), 2053 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6))); 2054 break; 2055 case BGP_EXT_COM_LINKBAND: 2056 bw.i = EXTRACT_32BITS(tptr+2); 2057 ND_PRINT((ndo, ": bandwidth: %.3f Mbps", 2058 bw.f*8/1000000)); 2059 break; 2060 case BGP_EXT_COM_VPN_ORIGIN: 2061 case BGP_EXT_COM_VPN_ORIGIN2: 2062 case BGP_EXT_COM_VPN_ORIGIN3: 2063 case BGP_EXT_COM_VPN_ORIGIN4: 2064 case BGP_EXT_COM_OSPF_RID: 2065 case BGP_EXT_COM_OSPF_RID2: 2066 ND_PRINT((ndo, "%s", getname(ndo, tptr+2))); 2067 break; 2068 case BGP_EXT_COM_OSPF_RTYPE: 2069 case BGP_EXT_COM_OSPF_RTYPE2: 2070 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s", 2071 getname(ndo, tptr+2), 2072 tok2strbuf(bgp_extd_comm_ospf_rtype_values, 2073 "unknown (0x%02x)", 2074 *(tptr+6), 2075 tokbuf, sizeof(tokbuf)), 2076 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", 2077 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "")); 2078 break; 2079 case BGP_EXT_COM_L2INFO: 2080 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u", 2081 tok2strbuf(l2vpn_encaps_values, 2082 "unknown encaps", 2083 *(tptr+2), 2084 tokbuf, sizeof(tokbuf)), 2085 *(tptr+3), 2086 EXTRACT_16BITS(tptr+4))); 2087 break; 2088 case BGP_EXT_COM_SOURCE_AS: 2089 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2))); 2090 break; 2091 default: 2092 ND_TCHECK2(*tptr,8); 2093 print_unknown_data(ndo, tptr, "\n\t ", 8); 2094 break; 2095 } 2096 tlen -=8; 2097 tptr +=8; 2098 } 2099 break; 2100 2101 case BGPTYPE_PMSI_TUNNEL: 2102 { 2103 uint8_t tunnel_type, flags; 2104 2105 tunnel_type = *(tptr+1); 2106 flags = *tptr; 2107 tlen = len; 2108 2109 ND_TCHECK2(tptr[0], 5); 2110 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", 2111 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), 2112 tunnel_type, 2113 bittok2str(bgp_pmsi_flag_values, "none", flags), 2114 EXTRACT_24BITS(tptr+2)>>4)); 2115 2116 tptr +=5; 2117 tlen -= 5; 2118 2119 switch (tunnel_type) { 2120 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ 2121 case BGP_PMSI_TUNNEL_PIM_BIDIR: 2122 ND_TCHECK2(tptr[0], 8); 2123 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s", 2124 ipaddr_string(ndo, tptr), 2125 ipaddr_string(ndo, tptr+4))); 2126 break; 2127 2128 case BGP_PMSI_TUNNEL_PIM_SSM: 2129 ND_TCHECK2(tptr[0], 8); 2130 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s", 2131 ipaddr_string(ndo, tptr), 2132 ipaddr_string(ndo, tptr+4))); 2133 break; 2134 case BGP_PMSI_TUNNEL_INGRESS: 2135 ND_TCHECK2(tptr[0], 4); 2136 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s", 2137 ipaddr_string(ndo, tptr))); 2138 break; 2139 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ 2140 case BGP_PMSI_TUNNEL_LDP_MP2MP: 2141 ND_TCHECK2(tptr[0], 8); 2142 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x", 2143 ipaddr_string(ndo, tptr), 2144 EXTRACT_32BITS(tptr+4))); 2145 break; 2146 case BGP_PMSI_TUNNEL_RSVP_P2MP: 2147 ND_TCHECK2(tptr[0], 8); 2148 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", 2149 ipaddr_string(ndo, tptr), 2150 EXTRACT_32BITS(tptr+4))); 2151 break; 2152 default: 2153 if (ndo->ndo_vflag <= 1) { 2154 print_unknown_data(ndo, tptr, "\n\t ", tlen); 2155 } 2156 } 2157 break; 2158 } 2159 case BGPTYPE_ATTR_SET: 2160 ND_TCHECK2(tptr[0], 4); 2161 if (len < 4) 2162 goto trunc; 2163 ND_PRINT((ndo, "\n\t Origin AS: %s", 2164 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)))); 2165 tptr+=4; 2166 len -=4; 2167 2168 while (len) { 2169 u_int aflags, atype, alenlen, alen; 2170 2171 ND_TCHECK2(tptr[0], 2); 2172 if (len < 2) 2173 goto trunc; 2174 aflags = *tptr; 2175 atype = *(tptr + 1); 2176 tptr += 2; 2177 len -= 2; 2178 alenlen = bgp_attr_lenlen(aflags, tptr); 2179 ND_TCHECK2(tptr[0], alenlen); 2180 if (len < alenlen) 2181 goto trunc; 2182 alen = bgp_attr_len(aflags, tptr); 2183 tptr += alenlen; 2184 len -= alenlen; 2185 2186 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2187 tok2strbuf(bgp_attr_values, 2188 "Unknown Attribute", atype, 2189 tokbuf, sizeof(tokbuf)), 2190 atype, 2191 alen)); 2192 2193 if (aflags) { 2194 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2195 aflags & 0x80 ? "O" : "", 2196 aflags & 0x40 ? "T" : "", 2197 aflags & 0x20 ? "P" : "", 2198 aflags & 0x10 ? "E" : "")); 2199 if (aflags & 0xf) 2200 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2201 ND_PRINT((ndo, "]: ")); 2202 } 2203 /* FIXME check for recursion */ 2204 if (!bgp_attr_print(ndo, atype, tptr, alen)) 2205 return 0; 2206 tptr += alen; 2207 len -= alen; 2208 } 2209 break; 2210 2211 2212 default: 2213 ND_TCHECK2(*pptr,len); 2214 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */ 2215 if (ndo->ndo_vflag <= 1) 2216 print_unknown_data(ndo, pptr, "\n\t ", len); 2217 break; 2218 } 2219 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/ 2220 ND_TCHECK2(*pptr,len); 2221 print_unknown_data(ndo, pptr, "\n\t ", len); 2222 } 2223 return 1; 2224 2225 trunc: 2226 return 0; 2227 } 2228 2229 static void 2230 bgp_capabilities_print(netdissect_options *ndo, 2231 const u_char *opt, int caps_len) 2232 { 2233 char tokbuf[TOKBUFSIZE]; 2234 char tokbuf2[TOKBUFSIZE]; 2235 int cap_type, cap_len, tcap_len, cap_offset; 2236 int i = 0; 2237 2238 while (i < caps_len) { 2239 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE); 2240 cap_type=opt[i]; 2241 cap_len=opt[i+1]; 2242 tcap_len=cap_len; 2243 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2244 tok2strbuf(bgp_capcode_values, "Unknown", 2245 cap_type, tokbuf, sizeof(tokbuf)), 2246 cap_type, 2247 cap_len)); 2248 ND_TCHECK2(opt[i+2], cap_len); 2249 switch (cap_type) { 2250 case BGP_CAPCODE_MP: 2251 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)", 2252 tok2strbuf(af_values, "Unknown", 2253 EXTRACT_16BITS(opt+i+2), 2254 tokbuf, sizeof(tokbuf)), 2255 EXTRACT_16BITS(opt+i+2), 2256 tok2strbuf(bgp_safi_values, "Unknown", 2257 opt[i+5], 2258 tokbuf, sizeof(tokbuf)), 2259 opt[i+5])); 2260 break; 2261 case BGP_CAPCODE_RESTART: 2262 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us", 2263 ((opt[i+2])&0x80) ? "R" : "none", 2264 EXTRACT_16BITS(opt+i+2)&0xfff)); 2265 tcap_len-=2; 2266 cap_offset=4; 2267 while(tcap_len>=4) { 2268 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", 2269 tok2strbuf(af_values,"Unknown", 2270 EXTRACT_16BITS(opt+i+cap_offset), 2271 tokbuf, sizeof(tokbuf)), 2272 EXTRACT_16BITS(opt+i+cap_offset), 2273 tok2strbuf(bgp_safi_values,"Unknown", 2274 opt[i+cap_offset+2], 2275 tokbuf2, sizeof(tokbuf2)), 2276 opt[i+cap_offset+2], 2277 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" )); 2278 tcap_len-=4; 2279 cap_offset+=4; 2280 } 2281 break; 2282 case BGP_CAPCODE_RR: 2283 case BGP_CAPCODE_RR_CISCO: 2284 break; 2285 case BGP_CAPCODE_AS_NEW: 2286 2287 /* 2288 * Extract the 4 byte AS number encoded. 2289 */ 2290 if (cap_len == 4) { 2291 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s", 2292 as_printf(ndo, astostr, sizeof(astostr), 2293 EXTRACT_32BITS(opt + i + 2)))); 2294 } 2295 break; 2296 default: 2297 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u", 2298 cap_type)); 2299 if (ndo->ndo_vflag <= 1) 2300 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2301 break; 2302 } 2303 if (ndo->ndo_vflag > 1 && cap_len > 0) { 2304 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2305 } 2306 i += BGP_CAP_HEADER_SIZE + cap_len; 2307 } 2308 return; 2309 2310 trunc: 2311 ND_PRINT((ndo, "[|BGP]")); 2312 } 2313 2314 static void 2315 bgp_open_print(netdissect_options *ndo, 2316 const u_char *dat, int length) 2317 { 2318 struct bgp_open bgpo; 2319 struct bgp_opt bgpopt; 2320 const u_char *opt; 2321 int i; 2322 char tokbuf[TOKBUFSIZE]; 2323 2324 ND_TCHECK2(dat[0], BGP_OPEN_SIZE); 2325 memcpy(&bgpo, dat, BGP_OPEN_SIZE); 2326 2327 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version)); 2328 ND_PRINT((ndo, "my AS %s, ", 2329 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas)))); 2330 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime))); 2331 ND_PRINT((ndo, "ID %s", getname(ndo, (u_char *)&bgpo.bgpo_id))); 2332 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen)); 2333 2334 /* some little sanity checking */ 2335 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) 2336 return; 2337 2338 /* ugly! */ 2339 opt = &((const struct bgp_open *)dat)->bgpo_optlen; 2340 opt++; 2341 2342 i = 0; 2343 while (i < bgpo.bgpo_optlen) { 2344 ND_TCHECK2(opt[i], BGP_OPT_SIZE); 2345 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); 2346 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { 2347 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len)); 2348 break; 2349 } 2350 2351 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u", 2352 tok2strbuf(bgp_opt_values,"Unknown", 2353 bgpopt.bgpopt_type, 2354 tokbuf, sizeof(tokbuf)), 2355 bgpopt.bgpopt_type, 2356 bgpopt.bgpopt_len)); 2357 2358 /* now let's decode the options we know*/ 2359 switch(bgpopt.bgpopt_type) { 2360 2361 case BGP_OPT_CAP: 2362 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE], 2363 bgpopt.bgpopt_len); 2364 break; 2365 2366 case BGP_OPT_AUTH: 2367 default: 2368 ND_PRINT((ndo, "\n\t no decoder for option %u", 2369 bgpopt.bgpopt_type)); 2370 break; 2371 } 2372 i += BGP_OPT_SIZE + bgpopt.bgpopt_len; 2373 } 2374 return; 2375 trunc: 2376 ND_PRINT((ndo, "[|BGP]")); 2377 } 2378 2379 static void 2380 bgp_update_print(netdissect_options *ndo, 2381 const u_char *dat, int length) 2382 { 2383 struct bgp bgp; 2384 const u_char *p; 2385 int withdrawn_routes_len; 2386 int len; 2387 int i; 2388 char tokbuf[TOKBUFSIZE]; 2389 #ifndef INET6 2390 char buf[MAXHOSTNAMELEN + 100]; 2391 int wpfx; 2392 #endif 2393 2394 ND_TCHECK2(dat[0], BGP_SIZE); 2395 if (length < BGP_SIZE) 2396 goto trunc; 2397 memcpy(&bgp, dat, BGP_SIZE); 2398 p = dat + BGP_SIZE; /*XXX*/ 2399 length -= BGP_SIZE; 2400 2401 /* Unfeasible routes */ 2402 ND_TCHECK2(p[0], 2); 2403 if (length < 2) 2404 goto trunc; 2405 withdrawn_routes_len = EXTRACT_16BITS(p); 2406 p += 2; 2407 length -= 2; 2408 if (withdrawn_routes_len) { 2409 /* 2410 * Without keeping state from the original NLRI message, 2411 * it's not possible to tell if this a v4 or v6 route, 2412 * so only try to decode it if we're not v6 enabled. 2413 */ 2414 ND_TCHECK2(p[0], withdrawn_routes_len); 2415 if (length < withdrawn_routes_len) 2416 goto trunc; 2417 #ifdef INET6 2418 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len)); 2419 p += withdrawn_routes_len; 2420 length -= withdrawn_routes_len; 2421 #else 2422 if (withdrawn_routes_len < 2) 2423 goto trunc; 2424 length -= 2; 2425 withdrawn_routes_len -= 2; 2426 2427 2428 ND_PRINT((ndo, "\n\t Withdrawn routes:")); 2429 2430 while(withdrawn_routes_len > 0) { 2431 wpfx = decode_prefix4(ndo, p, withdrawn_routes_len, buf, sizeof(buf)); 2432 if (wpfx == -1) { 2433 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2434 break; 2435 } else if (wpfx == -2) 2436 goto trunc; 2437 else if (wpfx == -3) 2438 goto trunc; /* bytes left, but not enough */ 2439 else { 2440 ND_PRINT((ndo, "\n\t %s", buf)); 2441 p += wpfx; 2442 length -= wpfx; 2443 withdrawn_routes_len -= wpfx; 2444 } 2445 } 2446 #endif 2447 } 2448 2449 ND_TCHECK2(p[0], 2); 2450 if (length < 2) 2451 goto trunc; 2452 len = EXTRACT_16BITS(p); 2453 p += 2; 2454 length -= 2; 2455 2456 if (withdrawn_routes_len == 0 && len == 0 && length == 0) { 2457 /* No withdrawn routes, no path attributes, no NLRI */ 2458 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 2459 return; 2460 } 2461 2462 if (len) { 2463 /* do something more useful!*/ 2464 while (len) { 2465 int aflags, atype, alenlen, alen; 2466 2467 ND_TCHECK2(p[0], 2); 2468 if (len < 2) 2469 goto trunc; 2470 if (length < 2) 2471 goto trunc; 2472 aflags = *p; 2473 atype = *(p + 1); 2474 p += 2; 2475 len -= 2; 2476 length -= 2; 2477 alenlen = bgp_attr_lenlen(aflags, p); 2478 ND_TCHECK2(p[0], alenlen); 2479 if (len < alenlen) 2480 goto trunc; 2481 if (length < alenlen) 2482 goto trunc; 2483 alen = bgp_attr_len(aflags, p); 2484 p += alenlen; 2485 len -= alenlen; 2486 length -= alenlen; 2487 2488 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2489 tok2strbuf(bgp_attr_values, "Unknown Attribute", 2490 atype, 2491 tokbuf, sizeof(tokbuf)), 2492 atype, 2493 alen)); 2494 2495 if (aflags) { 2496 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2497 aflags & 0x80 ? "O" : "", 2498 aflags & 0x40 ? "T" : "", 2499 aflags & 0x20 ? "P" : "", 2500 aflags & 0x10 ? "E" : "")); 2501 if (aflags & 0xf) 2502 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2503 ND_PRINT((ndo, "]: ")); 2504 } 2505 if (len < alen) 2506 goto trunc; 2507 if (length < alen) 2508 goto trunc; 2509 if (!bgp_attr_print(ndo, atype, p, alen)) 2510 goto trunc; 2511 p += alen; 2512 len -= alen; 2513 length -= alen; 2514 } 2515 } 2516 2517 if (length) { 2518 /* 2519 * XXX - what if they're using the "Advertisement of 2520 * Multiple Paths in BGP" feature: 2521 * 2522 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/ 2523 * 2524 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06 2525 */ 2526 ND_PRINT((ndo, "\n\t Updated routes:")); 2527 while (length) { 2528 char buf[MAXHOSTNAMELEN + 100]; 2529 i = decode_prefix4(ndo, p, length, buf, sizeof(buf)); 2530 if (i == -1) { 2531 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2532 break; 2533 } else if (i == -2) 2534 goto trunc; 2535 else if (i == -3) 2536 goto trunc; /* bytes left, but not enough */ 2537 else { 2538 ND_PRINT((ndo, "\n\t %s", buf)); 2539 p += i; 2540 length -= i; 2541 } 2542 } 2543 } 2544 return; 2545 trunc: 2546 ND_PRINT((ndo, "[|BGP]")); 2547 } 2548 2549 static void 2550 bgp_notification_print(netdissect_options *ndo, 2551 const u_char *dat, int length) 2552 { 2553 struct bgp_notification bgpn; 2554 const u_char *tptr; 2555 char tokbuf[TOKBUFSIZE]; 2556 char tokbuf2[TOKBUFSIZE]; 2557 2558 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); 2559 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); 2560 2561 /* some little sanity checking */ 2562 if (length<BGP_NOTIFICATION_SIZE) 2563 return; 2564 2565 ND_PRINT((ndo, ", %s (%u)", 2566 tok2strbuf(bgp_notify_major_values, "Unknown Error", 2567 bgpn.bgpn_major, tokbuf, sizeof(tokbuf)), 2568 bgpn.bgpn_major)); 2569 2570 switch (bgpn.bgpn_major) { 2571 2572 case BGP_NOTIFY_MAJOR_MSG: 2573 ND_PRINT((ndo, ", subcode %s (%u)", 2574 tok2strbuf(bgp_notify_minor_msg_values, "Unknown", 2575 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2576 bgpn.bgpn_minor)); 2577 break; 2578 case BGP_NOTIFY_MAJOR_OPEN: 2579 ND_PRINT((ndo, ", subcode %s (%u)", 2580 tok2strbuf(bgp_notify_minor_open_values, "Unknown", 2581 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2582 bgpn.bgpn_minor)); 2583 break; 2584 case BGP_NOTIFY_MAJOR_UPDATE: 2585 ND_PRINT((ndo, ", subcode %s (%u)", 2586 tok2strbuf(bgp_notify_minor_update_values, "Unknown", 2587 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2588 bgpn.bgpn_minor)); 2589 break; 2590 case BGP_NOTIFY_MAJOR_CAP: 2591 ND_PRINT((ndo, " subcode %s (%u)", 2592 tok2strbuf(bgp_notify_minor_cap_values, "Unknown", 2593 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2594 bgpn.bgpn_minor)); 2595 case BGP_NOTIFY_MAJOR_CEASE: 2596 ND_PRINT((ndo, ", subcode %s (%u)", 2597 tok2strbuf(bgp_notify_minor_cease_values, "Unknown", 2598 bgpn.bgpn_minor, tokbuf, sizeof(tokbuf)), 2599 bgpn.bgpn_minor)); 2600 2601 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes 2602 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES 2603 */ 2604 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { 2605 tptr = dat + BGP_NOTIFICATION_SIZE; 2606 ND_TCHECK2(*tptr, 7); 2607 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", 2608 tok2strbuf(af_values, "Unknown", 2609 EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)), 2610 EXTRACT_16BITS(tptr), 2611 tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2), 2612 tokbuf2, sizeof(tokbuf)), 2613 *(tptr+2), 2614 EXTRACT_32BITS(tptr+3))); 2615 } 2616 break; 2617 default: 2618 break; 2619 } 2620 2621 return; 2622 trunc: 2623 ND_PRINT((ndo, "[|BGP]")); 2624 } 2625 2626 static void 2627 bgp_route_refresh_print(netdissect_options *ndo, 2628 const u_char *pptr, int len) 2629 { 2630 const struct bgp_route_refresh *bgp_route_refresh_header; 2631 char tokbuf[TOKBUFSIZE]; 2632 char tokbuf2[TOKBUFSIZE]; 2633 2634 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE); 2635 2636 /* some little sanity checking */ 2637 if (len<BGP_ROUTE_REFRESH_SIZE) 2638 return; 2639 2640 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; 2641 2642 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)", 2643 tok2strbuf(af_values,"Unknown", 2644 /* this stinks but the compiler pads the structure 2645 * weird */ 2646 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2647 tokbuf, sizeof(tokbuf)), 2648 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2649 tok2strbuf(bgp_safi_values,"Unknown", 2650 bgp_route_refresh_header->safi, 2651 tokbuf2, sizeof(tokbuf2)), 2652 bgp_route_refresh_header->safi)); 2653 2654 if (ndo->ndo_vflag > 1) { 2655 ND_TCHECK2(*pptr, len); 2656 print_unknown_data(ndo, pptr, "\n\t ", len); 2657 } 2658 2659 return; 2660 trunc: 2661 ND_PRINT((ndo, "[|BGP]")); 2662 } 2663 2664 static int 2665 bgp_header_print(netdissect_options *ndo, 2666 const u_char *dat, int length) 2667 { 2668 struct bgp bgp; 2669 char tokbuf[TOKBUFSIZE]; 2670 2671 ND_TCHECK2(dat[0], BGP_SIZE); 2672 memcpy(&bgp, dat, BGP_SIZE); 2673 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u", 2674 tok2strbuf(bgp_msg_values, "Unknown", bgp.bgp_type, 2675 tokbuf, sizeof(tokbuf)), 2676 bgp.bgp_type, 2677 length)); 2678 2679 switch (bgp.bgp_type) { 2680 case BGP_OPEN: 2681 bgp_open_print(ndo, dat, length); 2682 break; 2683 case BGP_UPDATE: 2684 bgp_update_print(ndo, dat, length); 2685 break; 2686 case BGP_NOTIFICATION: 2687 bgp_notification_print(ndo, dat, length); 2688 break; 2689 case BGP_KEEPALIVE: 2690 break; 2691 case BGP_ROUTE_REFRESH: 2692 bgp_route_refresh_print(ndo, dat, length); 2693 break; 2694 default: 2695 /* we have no decoder for the BGP message */ 2696 ND_TCHECK2(*dat, length); 2697 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type)); 2698 print_unknown_data(ndo, dat, "\n\t ", length); 2699 break; 2700 } 2701 return 1; 2702 trunc: 2703 ND_PRINT((ndo, "[|BGP]")); 2704 return 0; 2705 } 2706 2707 void 2708 bgp_print(netdissect_options *ndo, 2709 const u_char *dat, int length) 2710 { 2711 const u_char *p; 2712 const u_char *ep; 2713 const u_char *start; 2714 const u_char marker[] = { 2715 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2716 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2717 }; 2718 struct bgp bgp; 2719 uint16_t hlen; 2720 char tokbuf[TOKBUFSIZE]; 2721 2722 ep = dat + length; 2723 if (ndo->ndo_snapend < dat + length) 2724 ep = ndo->ndo_snapend; 2725 2726 ND_PRINT((ndo, ": BGP")); 2727 2728 if (ndo->ndo_vflag < 1) /* lets be less chatty */ 2729 return; 2730 2731 p = dat; 2732 start = p; 2733 while (p < ep) { 2734 if (!ND_TTEST2(p[0], 1)) 2735 break; 2736 if (p[0] != 0xff) { 2737 p++; 2738 continue; 2739 } 2740 2741 if (!ND_TTEST2(p[0], sizeof(marker))) 2742 break; 2743 if (memcmp(p, marker, sizeof(marker)) != 0) { 2744 p++; 2745 continue; 2746 } 2747 2748 /* found BGP header */ 2749 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/ 2750 memcpy(&bgp, p, BGP_SIZE); 2751 2752 if (start != p) 2753 ND_PRINT((ndo, " [|BGP]")); 2754 2755 hlen = ntohs(bgp.bgp_len); 2756 if (hlen < BGP_SIZE) { 2757 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen, 2758 BGP_SIZE)); 2759 break; 2760 } 2761 2762 if (ND_TTEST2(p[0], hlen)) { 2763 if (!bgp_header_print(ndo, p, hlen)) 2764 return; 2765 p += hlen; 2766 start = p; 2767 } else { 2768 ND_PRINT((ndo, "\n[|BGP %s]", 2769 tok2strbuf(bgp_msg_values, 2770 "Unknown Message Type", 2771 bgp.bgp_type, 2772 tokbuf, sizeof(tokbuf)))); 2773 break; 2774 } 2775 } 2776 2777 return; 2778 2779 trunc: 2780 ND_PRINT((ndo, " [|BGP]")); 2781 } 2782 2783 /* 2784 * Local Variables: 2785 * c-style: whitesmith 2786 * c-basic-offset: 4 2787 * End: 2788 */ 2789