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 1.8 2017/02/05 04:05:05 spz Exp $"); 36 #endif 37 38 /* \summary: Border Gateway Protocol (BGP) printer */ 39 40 #ifdef HAVE_CONFIG_H 41 #include "config.h" 42 #endif 43 44 #include <netdissect-stdinc.h> 45 46 #include <stdio.h> 47 #include <string.h> 48 49 #include "netdissect.h" 50 #include "addrtoname.h" 51 #include "extract.h" 52 #include "af.h" 53 #include "l2vpn.h" 54 55 struct bgp { 56 uint8_t bgp_marker[16]; 57 uint16_t bgp_len; 58 uint8_t bgp_type; 59 }; 60 #define BGP_SIZE 19 /* unaligned */ 61 62 #define BGP_OPEN 1 63 #define BGP_UPDATE 2 64 #define BGP_NOTIFICATION 3 65 #define BGP_KEEPALIVE 4 66 #define BGP_ROUTE_REFRESH 5 67 68 static const struct tok bgp_msg_values[] = { 69 { BGP_OPEN, "Open"}, 70 { BGP_UPDATE, "Update"}, 71 { BGP_NOTIFICATION, "Notification"}, 72 { BGP_KEEPALIVE, "Keepalive"}, 73 { BGP_ROUTE_REFRESH, "Route Refresh"}, 74 { 0, NULL} 75 }; 76 77 struct bgp_open { 78 uint8_t bgpo_marker[16]; 79 uint16_t bgpo_len; 80 uint8_t bgpo_type; 81 uint8_t bgpo_version; 82 uint16_t bgpo_myas; 83 uint16_t bgpo_holdtime; 84 uint32_t bgpo_id; 85 uint8_t bgpo_optlen; 86 /* options should follow */ 87 }; 88 #define BGP_OPEN_SIZE 29 /* unaligned */ 89 90 struct bgp_opt { 91 uint8_t bgpopt_type; 92 uint8_t bgpopt_len; 93 /* variable length */ 94 }; 95 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */ 96 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */ 97 98 struct bgp_notification { 99 uint8_t bgpn_marker[16]; 100 uint16_t bgpn_len; 101 uint8_t bgpn_type; 102 uint8_t bgpn_major; 103 uint8_t bgpn_minor; 104 }; 105 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */ 106 107 struct bgp_route_refresh { 108 uint8_t bgp_marker[16]; 109 uint16_t len; 110 uint8_t type; 111 uint8_t afi[2]; /* the compiler messes this structure up */ 112 uint8_t res; /* when doing misaligned sequences of int8 and int16 */ 113 uint8_t safi; /* afi should be int16 - so we have to access it using */ 114 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */ 115 #define BGP_ROUTE_REFRESH_SIZE 23 116 117 #define bgp_attr_lenlen(flags, p) \ 118 (((flags) & 0x10) ? 2 : 1) 119 #define bgp_attr_len(flags, p) \ 120 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p)) 121 122 #define BGPTYPE_ORIGIN 1 123 #define BGPTYPE_AS_PATH 2 124 #define BGPTYPE_NEXT_HOP 3 125 #define BGPTYPE_MULTI_EXIT_DISC 4 126 #define BGPTYPE_LOCAL_PREF 5 127 #define BGPTYPE_ATOMIC_AGGREGATE 6 128 #define BGPTYPE_AGGREGATOR 7 129 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */ 130 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */ 131 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */ 132 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */ 133 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */ 134 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */ 135 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */ 136 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */ 137 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */ 138 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */ 139 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */ 140 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */ 141 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */ 142 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */ 143 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */ 144 #define BGPTYPE_AIGP 26 /* RFC7311 */ 145 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */ 146 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */ 147 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */ 148 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */ 149 150 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */ 151 152 static const struct tok bgp_attr_values[] = { 153 { BGPTYPE_ORIGIN, "Origin"}, 154 { BGPTYPE_AS_PATH, "AS Path"}, 155 { BGPTYPE_AS4_PATH, "AS4 Path"}, 156 { BGPTYPE_NEXT_HOP, "Next Hop"}, 157 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"}, 158 { BGPTYPE_LOCAL_PREF, "Local Preference"}, 159 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"}, 160 { BGPTYPE_AGGREGATOR, "Aggregator"}, 161 { BGPTYPE_AGGREGATOR4, "Aggregator4"}, 162 { BGPTYPE_COMMUNITIES, "Community"}, 163 { BGPTYPE_ORIGINATOR_ID, "Originator ID"}, 164 { BGPTYPE_CLUSTER_LIST, "Cluster List"}, 165 { BGPTYPE_DPA, "DPA"}, 166 { BGPTYPE_ADVERTISERS, "Advertisers"}, 167 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"}, 168 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"}, 169 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"}, 170 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"}, 171 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"}, 172 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"}, 173 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"}, 174 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"}, 175 { BGPTYPE_AIGP, "Accumulated IGP Metric"}, 176 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"}, 177 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"}, 178 { BGPTYPE_LARGE_COMMUNITY, "Large Community"}, 179 { BGPTYPE_ATTR_SET, "Attribute Set"}, 180 { 255, "Reserved for development"}, 181 { 0, NULL} 182 }; 183 184 #define BGP_AS_SET 1 185 #define BGP_AS_SEQUENCE 2 186 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */ 187 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */ 188 189 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET 190 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET 191 192 static const struct tok bgp_as_path_segment_open_values[] = { 193 { BGP_AS_SEQUENCE, ""}, 194 { BGP_AS_SET, "{ "}, 195 { BGP_CONFED_AS_SEQUENCE, "( "}, 196 { BGP_CONFED_AS_SET, "({ "}, 197 { 0, NULL} 198 }; 199 200 static const struct tok bgp_as_path_segment_close_values[] = { 201 { BGP_AS_SEQUENCE, ""}, 202 { BGP_AS_SET, "}"}, 203 { BGP_CONFED_AS_SEQUENCE, ")"}, 204 { BGP_CONFED_AS_SET, "})"}, 205 { 0, NULL} 206 }; 207 208 #define BGP_OPT_AUTH 1 209 #define BGP_OPT_CAP 2 210 211 static const struct tok bgp_opt_values[] = { 212 { BGP_OPT_AUTH, "Authentication Information"}, 213 { BGP_OPT_CAP, "Capabilities Advertisement"}, 214 { 0, NULL} 215 }; 216 217 #define BGP_CAPCODE_MP 1 /* RFC2858 */ 218 #define BGP_CAPCODE_RR 2 /* RFC2918 */ 219 #define BGP_CAPCODE_ORF 3 /* RFC5291 */ 220 #define BGP_CAPCODE_MR 4 /* RFC3107 */ 221 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */ 222 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */ 223 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */ 224 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */ 225 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */ 226 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */ 227 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */ 228 #define BGP_CAPCODE_RR_CISCO 128 229 230 static const struct tok bgp_capcode_values[] = { 231 { BGP_CAPCODE_MP, "Multiprotocol Extensions"}, 232 { BGP_CAPCODE_RR, "Route Refresh"}, 233 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"}, 234 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"}, 235 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"}, 236 { BGP_CAPCODE_RESTART, "Graceful Restart"}, 237 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"}, 238 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"}, 239 { BGP_CAPCODE_MULTISESS, "Multisession BGP"}, 240 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"}, 241 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"}, 242 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"}, 243 { 0, NULL} 244 }; 245 246 #define BGP_NOTIFY_MAJOR_MSG 1 247 #define BGP_NOTIFY_MAJOR_OPEN 2 248 #define BGP_NOTIFY_MAJOR_UPDATE 3 249 #define BGP_NOTIFY_MAJOR_HOLDTIME 4 250 #define BGP_NOTIFY_MAJOR_FSM 5 251 #define BGP_NOTIFY_MAJOR_CEASE 6 252 #define BGP_NOTIFY_MAJOR_CAP 7 253 254 static const struct tok bgp_notify_major_values[] = { 255 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"}, 256 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"}, 257 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"}, 258 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"}, 259 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"}, 260 { BGP_NOTIFY_MAJOR_CEASE, "Cease"}, 261 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"}, 262 { 0, NULL} 263 }; 264 265 /* draft-ietf-idr-cease-subcode-02 */ 266 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1 267 static const struct tok bgp_notify_minor_cease_values[] = { 268 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"}, 269 { 2, "Administratively Shutdown"}, 270 { 3, "Peer Unconfigured"}, 271 { 4, "Administratively Reset"}, 272 { 5, "Connection Rejected"}, 273 { 6, "Other Configuration Change"}, 274 { 7, "Connection Collision Resolution"}, 275 { 0, NULL} 276 }; 277 278 static const struct tok bgp_notify_minor_msg_values[] = { 279 { 1, "Connection Not Synchronized"}, 280 { 2, "Bad Message Length"}, 281 { 3, "Bad Message Type"}, 282 { 0, NULL} 283 }; 284 285 static const struct tok bgp_notify_minor_open_values[] = { 286 { 1, "Unsupported Version Number"}, 287 { 2, "Bad Peer AS"}, 288 { 3, "Bad BGP Identifier"}, 289 { 4, "Unsupported Optional Parameter"}, 290 { 5, "Authentication Failure"}, 291 { 6, "Unacceptable Hold Time"}, 292 { 7, "Capability Message Error"}, 293 { 0, NULL} 294 }; 295 296 static const struct tok bgp_notify_minor_update_values[] = { 297 { 1, "Malformed Attribute List"}, 298 { 2, "Unrecognized Well-known Attribute"}, 299 { 3, "Missing Well-known Attribute"}, 300 { 4, "Attribute Flags Error"}, 301 { 5, "Attribute Length Error"}, 302 { 6, "Invalid ORIGIN Attribute"}, 303 { 7, "AS Routing Loop"}, 304 { 8, "Invalid NEXT_HOP Attribute"}, 305 { 9, "Optional Attribute Error"}, 306 { 10, "Invalid Network Field"}, 307 { 11, "Malformed AS_PATH"}, 308 { 0, NULL} 309 }; 310 311 static const struct tok bgp_notify_minor_fsm_values[] = { 312 { 1, "In OpenSent State"}, 313 { 2, "In OpenConfirm State"}, 314 { 3, "In Established State"}, 315 { 0, NULL } 316 }; 317 318 static const struct tok bgp_notify_minor_cap_values[] = { 319 { 1, "Invalid Action Value" }, 320 { 2, "Invalid Capability Length" }, 321 { 3, "Malformed Capability Value" }, 322 { 4, "Unsupported Capability Code" }, 323 { 0, NULL } 324 }; 325 326 static const struct tok bgp_origin_values[] = { 327 { 0, "IGP"}, 328 { 1, "EGP"}, 329 { 2, "Incomplete"}, 330 { 0, NULL} 331 }; 332 333 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1 334 #define BGP_PMSI_TUNNEL_LDP_P2MP 2 335 #define BGP_PMSI_TUNNEL_PIM_SSM 3 336 #define BGP_PMSI_TUNNEL_PIM_SM 4 337 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5 338 #define BGP_PMSI_TUNNEL_INGRESS 6 339 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7 340 341 static const struct tok bgp_pmsi_tunnel_values[] = { 342 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"}, 343 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"}, 344 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"}, 345 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"}, 346 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"}, 347 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"}, 348 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"}, 349 { 0, NULL} 350 }; 351 352 static const struct tok bgp_pmsi_flag_values[] = { 353 { 0x01, "Leaf Information required"}, 354 { 0, NULL} 355 }; 356 357 #define BGP_AIGP_TLV 1 358 359 static const struct tok bgp_aigp_values[] = { 360 { BGP_AIGP_TLV, "AIGP"}, 361 { 0, NULL} 362 }; 363 364 /* Subsequent address family identifier, RFC2283 section 7 */ 365 #define SAFNUM_RES 0 366 #define SAFNUM_UNICAST 1 367 #define SAFNUM_MULTICAST 2 368 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */ 369 /* labeled BGP RFC3107 */ 370 #define SAFNUM_LABUNICAST 4 371 /* RFC6514 */ 372 #define SAFNUM_MULTICAST_VPN 5 373 /* draft-nalawade-kapoor-tunnel-safi */ 374 #define SAFNUM_TUNNEL 64 375 /* RFC4761 */ 376 #define SAFNUM_VPLS 65 377 /* RFC6037 */ 378 #define SAFNUM_MDT 66 379 /* RFC4364 */ 380 #define SAFNUM_VPNUNICAST 128 381 /* RFC6513 */ 382 #define SAFNUM_VPNMULTICAST 129 383 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */ 384 /* RFC4684 */ 385 #define SAFNUM_RT_ROUTING_INFO 132 386 387 #define BGP_VPN_RD_LEN 8 388 389 static const struct tok bgp_safi_values[] = { 390 { SAFNUM_RES, "Reserved"}, 391 { SAFNUM_UNICAST, "Unicast"}, 392 { SAFNUM_MULTICAST, "Multicast"}, 393 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"}, 394 { SAFNUM_LABUNICAST, "labeled Unicast"}, 395 { SAFNUM_TUNNEL, "Tunnel"}, 396 { SAFNUM_VPLS, "VPLS"}, 397 { SAFNUM_MDT, "MDT"}, 398 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"}, 399 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"}, 400 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"}, 401 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"}, 402 { SAFNUM_MULTICAST_VPN, "Multicast VPN"}, 403 { 0, NULL } 404 }; 405 406 /* well-known community */ 407 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01 408 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02 409 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 410 411 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */ 412 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */ 413 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */ 414 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */ 415 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */ 416 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */ 417 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */ 418 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */ 419 /* rfc2547 bgp-mpls-vpns */ 420 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */ 421 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */ 422 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */ 423 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */ 424 425 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */ 426 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */ 427 428 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */ 429 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */ 430 431 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */ 432 433 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 434 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 435 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */ 436 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */ 437 438 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */ 439 #define BGP_EXT_COM_EIGRP_GEN 0x8800 440 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801 441 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802 442 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803 443 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804 444 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805 445 446 static const struct tok bgp_extd_comm_flag_values[] = { 447 { 0x8000, "vendor-specific"}, 448 { 0x4000, "non-transitive"}, 449 { 0, NULL}, 450 }; 451 452 static const struct tok bgp_extd_comm_subtype_values[] = { 453 { BGP_EXT_COM_RT_0, "target"}, 454 { BGP_EXT_COM_RT_1, "target"}, 455 { BGP_EXT_COM_RT_2, "target"}, 456 { BGP_EXT_COM_RO_0, "origin"}, 457 { BGP_EXT_COM_RO_1, "origin"}, 458 { BGP_EXT_COM_RO_2, "origin"}, 459 { BGP_EXT_COM_LINKBAND, "link-BW"}, 460 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"}, 461 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"}, 462 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"}, 463 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"}, 464 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"}, 465 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"}, 466 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"}, 467 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"}, 468 { BGP_EXT_COM_L2INFO, "layer2-info"}, 469 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" }, 470 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" }, 471 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" }, 472 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" }, 473 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" }, 474 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" }, 475 { BGP_EXT_COM_SOURCE_AS, "source-AS" }, 476 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"}, 477 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"}, 478 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"}, 479 { 0, NULL}, 480 }; 481 482 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */ 483 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */ 484 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */ 485 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */ 486 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */ 487 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/ 488 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */ 489 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */ 490 491 static const struct tok bgp_extd_comm_ospf_rtype_values[] = { 492 { BGP_OSPF_RTYPE_RTR, "Router" }, 493 { BGP_OSPF_RTYPE_NET, "Network" }, 494 { BGP_OSPF_RTYPE_SUM, "Summary" }, 495 { BGP_OSPF_RTYPE_EXT, "External" }, 496 { BGP_OSPF_RTYPE_NSSA,"NSSA External" }, 497 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" }, 498 { 0, NULL }, 499 }; 500 501 /* ADD-PATH Send/Receive field values */ 502 static const struct tok bgp_add_path_recvsend[] = { 503 { 1, "Receive" }, 504 { 2, "Send" }, 505 { 3, "Both" }, 506 { 0, NULL }, 507 }; 508 509 static char astostr[20]; 510 511 /* 512 * as_printf 513 * 514 * Convert an AS number into a string and return string pointer. 515 * 516 * Depending on bflag is set or not, AS number is converted into ASDOT notation 517 * or plain number notation. 518 * 519 */ 520 static char * 521 as_printf(netdissect_options *ndo, 522 char *str, int size, u_int asnum) 523 { 524 if (!ndo->ndo_bflag || asnum <= 0xFFFF) { 525 snprintf(str, size, "%u", asnum); 526 } else { 527 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF); 528 } 529 return str; 530 } 531 532 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv; 533 534 int 535 decode_prefix4(netdissect_options *ndo, 536 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 537 { 538 struct in_addr addr; 539 u_int plen, plenbytes; 540 541 ND_TCHECK(pptr[0]); 542 ITEMCHECK(1); 543 plen = pptr[0]; 544 if (32 < plen) 545 return -1; 546 itemlen -= 1; 547 548 memset(&addr, 0, sizeof(addr)); 549 plenbytes = (plen + 7) / 8; 550 ND_TCHECK2(pptr[1], plenbytes); 551 ITEMCHECK(plenbytes); 552 memcpy(&addr, &pptr[1], plenbytes); 553 if (plen % 8) { 554 ((u_char *)&addr)[plenbytes - 1] &= 555 ((0xff00 >> (plen % 8)) & 0xff); 556 } 557 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen); 558 return 1 + plenbytes; 559 560 trunc: 561 return -2; 562 563 badtlv: 564 return -3; 565 } 566 567 static int 568 decode_labeled_prefix4(netdissect_options *ndo, 569 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 570 { 571 struct in_addr addr; 572 u_int plen, plenbytes; 573 574 /* prefix length and label = 4 bytes */ 575 ND_TCHECK2(pptr[0], 4); 576 ITEMCHECK(4); 577 plen = pptr[0]; /* get prefix length */ 578 579 /* this is one of the weirdnesses of rfc3107 580 the label length (actually the label + COS bits) 581 is added to the prefix length; 582 we also do only read out just one label - 583 there is no real application for advertisement of 584 stacked labels in a single BGP message 585 */ 586 587 if (24 > plen) 588 return -1; 589 590 plen-=24; /* adjust prefixlen - labellength */ 591 592 if (32 < plen) 593 return -1; 594 itemlen -= 4; 595 596 memset(&addr, 0, sizeof(addr)); 597 plenbytes = (plen + 7) / 8; 598 ND_TCHECK2(pptr[4], plenbytes); 599 ITEMCHECK(plenbytes); 600 memcpy(&addr, &pptr[4], plenbytes); 601 if (plen % 8) { 602 ((u_char *)&addr)[plenbytes - 1] &= 603 ((0xff00 >> (plen % 8)) & 0xff); 604 } 605 /* the label may get offsetted by 4 bits so lets shift it right */ 606 snprintf(buf, buflen, "%s/%d, label:%u %s", 607 ipaddr_string(ndo, &addr), 608 plen, 609 EXTRACT_24BITS(pptr+1)>>4, 610 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 611 612 return 4 + plenbytes; 613 614 trunc: 615 return -2; 616 617 badtlv: 618 return -3; 619 } 620 621 /* 622 * bgp_vpn_ip_print 623 * 624 * print an ipv4 or ipv6 address into a buffer dependend on address length. 625 */ 626 static char * 627 bgp_vpn_ip_print(netdissect_options *ndo, 628 const u_char *pptr, u_int addr_length) 629 { 630 631 /* worst case string is s fully formatted v6 address */ 632 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")]; 633 char *pos = addr; 634 635 switch(addr_length) { 636 case (sizeof(struct in_addr) << 3): /* 32 */ 637 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 638 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr)); 639 break; 640 case (sizeof(struct in6_addr) << 3): /* 128 */ 641 ND_TCHECK2(pptr[0], sizeof(struct in6_addr)); 642 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr)); 643 break; 644 default: 645 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length); 646 break; 647 } 648 pos += strlen(pos); 649 650 trunc: 651 *(pos) = '\0'; 652 return (addr); 653 } 654 655 /* 656 * bgp_vpn_sg_print 657 * 658 * print an multicast s,g entry into a buffer. 659 * the s,g entry is encoded like this. 660 * 661 * +-----------------------------------+ 662 * | Multicast Source Length (1 octet) | 663 * +-----------------------------------+ 664 * | Multicast Source (Variable) | 665 * +-----------------------------------+ 666 * | Multicast Group Length (1 octet) | 667 * +-----------------------------------+ 668 * | Multicast Group (Variable) | 669 * +-----------------------------------+ 670 * 671 * return the number of bytes read from the wire. 672 */ 673 static int 674 bgp_vpn_sg_print(netdissect_options *ndo, 675 const u_char *pptr, char *buf, u_int buflen) 676 { 677 uint8_t addr_length; 678 u_int total_length, offset; 679 680 total_length = 0; 681 682 /* Source address length, encoded in bits */ 683 ND_TCHECK2(pptr[0], 1); 684 addr_length = *pptr++; 685 686 /* Source address */ 687 ND_TCHECK2(pptr[0], (addr_length >> 3)); 688 total_length += (addr_length >> 3) + 1; 689 offset = strlen(buf); 690 if (addr_length) { 691 snprintf(buf + offset, buflen - offset, ", Source %s", 692 bgp_vpn_ip_print(ndo, pptr, addr_length)); 693 pptr += (addr_length >> 3); 694 } 695 696 /* Group address length, encoded in bits */ 697 ND_TCHECK2(pptr[0], 1); 698 addr_length = *pptr++; 699 700 /* Group address */ 701 ND_TCHECK2(pptr[0], (addr_length >> 3)); 702 total_length += (addr_length >> 3) + 1; 703 offset = strlen(buf); 704 if (addr_length) { 705 snprintf(buf + offset, buflen - offset, ", Group %s", 706 bgp_vpn_ip_print(ndo, pptr, addr_length)); 707 pptr += (addr_length >> 3); 708 } 709 710 trunc: 711 return (total_length); 712 } 713 714 /* RDs and RTs share the same semantics 715 * we use bgp_vpn_rd_print for 716 * printing route targets inside a NLRI */ 717 char * 718 bgp_vpn_rd_print(netdissect_options *ndo, 719 const u_char *pptr) 720 { 721 /* allocate space for the largest possible string */ 722 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")]; 723 char *pos = rd; 724 725 /* ok lets load the RD format */ 726 switch (EXTRACT_16BITS(pptr)) { 727 728 /* 2-byte-AS:number fmt*/ 729 case 0: 730 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)", 731 EXTRACT_16BITS(pptr+2), 732 EXTRACT_32BITS(pptr+4), 733 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7)); 734 break; 735 /* IP-address:AS fmt*/ 736 737 case 1: 738 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u", 739 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6)); 740 break; 741 742 /* 4-byte-AS:number fmt*/ 743 case 2: 744 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)", 745 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)), 746 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4), 747 *(pptr+5), EXTRACT_16BITS(pptr+6)); 748 break; 749 default: 750 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format"); 751 break; 752 } 753 pos += strlen(pos); 754 *(pos) = '\0'; 755 return (rd); 756 } 757 758 static int 759 decode_rt_routing_info(netdissect_options *ndo, 760 const u_char *pptr, char *buf, u_int buflen) 761 { 762 uint8_t route_target[8]; 763 u_int plen; 764 765 ND_TCHECK(pptr[0]); 766 plen = pptr[0]; /* get prefix length */ 767 768 if (0 == plen) { 769 snprintf(buf, buflen, "default route target"); 770 return 1; 771 } 772 773 if (32 > plen) 774 return -1; 775 776 plen-=32; /* adjust prefix length */ 777 778 if (64 < plen) 779 return -1; 780 781 memset(&route_target, 0, sizeof(route_target)); 782 ND_TCHECK2(pptr[1], (plen + 7) / 8); 783 memcpy(&route_target, &pptr[1], (plen + 7) / 8); 784 if (plen % 8) { 785 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= 786 ((0xff00 >> (plen % 8)) & 0xff); 787 } 788 snprintf(buf, buflen, "origin AS: %s, route target %s", 789 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+1)), 790 bgp_vpn_rd_print(ndo, (u_char *)&route_target)); 791 792 return 5 + (plen + 7) / 8; 793 794 trunc: 795 return -2; 796 } 797 798 static int 799 decode_labeled_vpn_prefix4(netdissect_options *ndo, 800 const u_char *pptr, char *buf, u_int buflen) 801 { 802 struct in_addr addr; 803 u_int plen; 804 805 ND_TCHECK(pptr[0]); 806 plen = pptr[0]; /* get prefix length */ 807 808 if ((24+64) > plen) 809 return -1; 810 811 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 812 813 if (32 < plen) 814 return -1; 815 816 memset(&addr, 0, sizeof(addr)); 817 ND_TCHECK2(pptr[12], (plen + 7) / 8); 818 memcpy(&addr, &pptr[12], (plen + 7) / 8); 819 if (plen % 8) { 820 ((u_char *)&addr)[(plen + 7) / 8 - 1] &= 821 ((0xff00 >> (plen % 8)) & 0xff); 822 } 823 /* the label may get offsetted by 4 bits so lets shift it right */ 824 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 825 bgp_vpn_rd_print(ndo, pptr+4), 826 ipaddr_string(ndo, &addr), 827 plen, 828 EXTRACT_24BITS(pptr+1)>>4, 829 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 830 831 return 12 + (plen + 7) / 8; 832 833 trunc: 834 return -2; 835 } 836 837 /* 838 * +-------------------------------+ 839 * | | 840 * | RD:IPv4-address (12 octets) | 841 * | | 842 * +-------------------------------+ 843 * | MDT Group-address (4 octets) | 844 * +-------------------------------+ 845 */ 846 847 #define MDT_VPN_NLRI_LEN 16 848 849 static int 850 decode_mdt_vpn_nlri(netdissect_options *ndo, 851 const u_char *pptr, char *buf, u_int buflen) 852 { 853 854 const u_char *rd; 855 const u_char *vpn_ip; 856 857 ND_TCHECK(pptr[0]); 858 859 /* if the NLRI is not predefined length, quit.*/ 860 if (*pptr != MDT_VPN_NLRI_LEN * 8) 861 return -1; 862 pptr++; 863 864 /* RD */ 865 ND_TCHECK2(pptr[0], 8); 866 rd = pptr; 867 pptr+=8; 868 869 /* IPv4 address */ 870 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 871 vpn_ip = pptr; 872 pptr+=sizeof(struct in_addr); 873 874 /* MDT Group Address */ 875 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 876 877 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s", 878 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr)); 879 880 return MDT_VPN_NLRI_LEN + 1; 881 882 trunc: 883 884 return -2; 885 } 886 887 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1 888 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2 889 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3 890 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4 891 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5 892 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6 893 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7 894 895 static const struct tok bgp_multicast_vpn_route_type_values[] = { 896 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"}, 897 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"}, 898 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"}, 899 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"}, 900 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"}, 901 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"}, 902 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"}, 903 }; 904 905 static int 906 decode_multicast_vpn(netdissect_options *ndo, 907 const u_char *pptr, char *buf, u_int buflen) 908 { 909 uint8_t route_type, route_length, addr_length, sg_length; 910 u_int offset; 911 912 ND_TCHECK2(pptr[0], 2); 913 route_type = *pptr++; 914 route_length = *pptr++; 915 916 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", 917 tok2str(bgp_multicast_vpn_route_type_values, 918 "Unknown", route_type), 919 route_type, route_length); 920 921 switch(route_type) { 922 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: 923 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 924 offset = strlen(buf); 925 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", 926 bgp_vpn_rd_print(ndo, pptr), 927 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN, 928 (route_length - BGP_VPN_RD_LEN) << 3)); 929 break; 930 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: 931 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); 932 offset = strlen(buf); 933 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 934 bgp_vpn_rd_print(ndo, pptr), 935 as_printf(ndo, astostr, sizeof(astostr), 936 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 937 break; 938 939 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: 940 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 941 offset = strlen(buf); 942 snprintf(buf + offset, buflen - offset, ", RD: %s", 943 bgp_vpn_rd_print(ndo, pptr)); 944 pptr += BGP_VPN_RD_LEN; 945 946 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen); 947 addr_length = route_length - sg_length; 948 949 ND_TCHECK2(pptr[0], addr_length); 950 offset = strlen(buf); 951 snprintf(buf + offset, buflen - offset, ", Originator %s", 952 bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); 953 break; 954 955 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: 956 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 957 offset = strlen(buf); 958 snprintf(buf + offset, buflen - offset, ", RD: %s", 959 bgp_vpn_rd_print(ndo, pptr)); 960 pptr += BGP_VPN_RD_LEN; 961 962 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 963 break; 964 965 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ 966 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: 967 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 968 offset = strlen(buf); 969 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 970 bgp_vpn_rd_print(ndo, pptr), 971 as_printf(ndo, astostr, sizeof(astostr), 972 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 973 pptr += BGP_VPN_RD_LEN; 974 975 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 976 break; 977 978 /* 979 * no per route-type printing yet. 980 */ 981 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: 982 default: 983 break; 984 } 985 986 return route_length + 2; 987 988 trunc: 989 return -2; 990 } 991 992 /* 993 * As I remember, some versions of systems have an snprintf() that 994 * returns -1 if the buffer would have overflowed. If the return 995 * value is negative, set buflen to 0, to indicate that we've filled 996 * the buffer up. 997 * 998 * If the return value is greater than buflen, that means that 999 * the buffer would have overflowed; again, set buflen to 0 in 1000 * that case. 1001 */ 1002 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \ 1003 if (stringlen<0) \ 1004 buflen=0; \ 1005 else if ((u_int)stringlen>buflen) \ 1006 buflen=0; \ 1007 else { \ 1008 buflen-=stringlen; \ 1009 buf+=stringlen; \ 1010 } 1011 1012 static int 1013 decode_labeled_vpn_l2(netdissect_options *ndo, 1014 const u_char *pptr, char *buf, u_int buflen) 1015 { 1016 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len; 1017 1018 ND_TCHECK2(pptr[0], 2); 1019 plen=EXTRACT_16BITS(pptr); 1020 tlen=plen; 1021 pptr+=2; 1022 /* Old and new L2VPN NLRI share AFI/SAFI 1023 * -> Assume a 12 Byte-length NLRI is auto-discovery-only 1024 * and > 17 as old format. Complain for the middle case 1025 */ 1026 if (plen==12) { 1027 /* assume AD-only with RD, BGPNH */ 1028 ND_TCHECK2(pptr[0],12); 1029 buf[0]='\0'; 1030 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s", 1031 bgp_vpn_rd_print(ndo, pptr), 1032 ipaddr_string(ndo, pptr+8) 1033 ); 1034 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1035 pptr+=12; 1036 tlen-=12; 1037 return plen; 1038 } else if (plen>17) { 1039 /* assume old format */ 1040 /* RD, ID, LBLKOFF, LBLBASE */ 1041 1042 ND_TCHECK2(pptr[0],15); 1043 buf[0]='\0'; 1044 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", 1045 bgp_vpn_rd_print(ndo, pptr), 1046 EXTRACT_16BITS(pptr+8), 1047 EXTRACT_16BITS(pptr+10), 1048 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ 1049 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1050 pptr+=15; 1051 tlen-=15; 1052 1053 /* ok now the variable part - lets read out TLVs*/ 1054 while (tlen>0) { 1055 if (tlen < 3) 1056 return -1; 1057 ND_TCHECK2(pptr[0], 3); 1058 tlv_type=*pptr++; 1059 tlv_len=EXTRACT_16BITS(pptr); 1060 ttlv_len=tlv_len; 1061 pptr+=2; 1062 1063 switch(tlv_type) { 1064 case 1: 1065 if (buflen!=0) { 1066 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", 1067 tlv_type, 1068 tlv_len); 1069 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1070 } 1071 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */ 1072 while (ttlv_len>0) { 1073 ND_TCHECK(pptr[0]); 1074 if (buflen!=0) { 1075 stringlen=snprintf(buf,buflen, "%02x",*pptr++); 1076 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1077 } 1078 ttlv_len--; 1079 } 1080 break; 1081 default: 1082 if (buflen!=0) { 1083 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", 1084 tlv_type, 1085 tlv_len); 1086 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1087 } 1088 break; 1089 } 1090 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */ 1091 } 1092 return plen+2; 1093 1094 } else { 1095 /* complain bitterly ? */ 1096 /* fall through */ 1097 goto trunc; 1098 } 1099 1100 trunc: 1101 return -2; 1102 } 1103 1104 int 1105 decode_prefix6(netdissect_options *ndo, 1106 const u_char *pd, u_int itemlen, char *buf, u_int buflen) 1107 { 1108 struct in6_addr addr; 1109 u_int plen, plenbytes; 1110 1111 ND_TCHECK(pd[0]); 1112 ITEMCHECK(1); 1113 plen = pd[0]; 1114 if (128 < plen) 1115 return -1; 1116 itemlen -= 1; 1117 1118 memset(&addr, 0, sizeof(addr)); 1119 plenbytes = (plen + 7) / 8; 1120 ND_TCHECK2(pd[1], plenbytes); 1121 ITEMCHECK(plenbytes); 1122 memcpy(&addr, &pd[1], plenbytes); 1123 if (plen % 8) { 1124 addr.s6_addr[plenbytes - 1] &= 1125 ((0xff00 >> (plen % 8)) & 0xff); 1126 } 1127 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen); 1128 return 1 + plenbytes; 1129 1130 trunc: 1131 return -2; 1132 1133 badtlv: 1134 return -3; 1135 } 1136 1137 static int 1138 decode_labeled_prefix6(netdissect_options *ndo, 1139 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 1140 { 1141 struct in6_addr addr; 1142 u_int plen, plenbytes; 1143 1144 /* prefix length and label = 4 bytes */ 1145 ND_TCHECK2(pptr[0], 4); 1146 ITEMCHECK(4); 1147 plen = pptr[0]; /* get prefix length */ 1148 1149 if (24 > plen) 1150 return -1; 1151 1152 plen-=24; /* adjust prefixlen - labellength */ 1153 1154 if (128 < plen) 1155 return -1; 1156 itemlen -= 4; 1157 1158 memset(&addr, 0, sizeof(addr)); 1159 plenbytes = (plen + 7) / 8; 1160 ND_TCHECK2(pptr[4], plenbytes); 1161 memcpy(&addr, &pptr[4], plenbytes); 1162 if (plen % 8) { 1163 addr.s6_addr[plenbytes - 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, "%s/%d, label:%u %s", 1168 ip6addr_string(ndo, &addr), 1169 plen, 1170 EXTRACT_24BITS(pptr+1)>>4, 1171 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1172 1173 return 4 + plenbytes; 1174 1175 trunc: 1176 return -2; 1177 1178 badtlv: 1179 return -3; 1180 } 1181 1182 static int 1183 decode_labeled_vpn_prefix6(netdissect_options *ndo, 1184 const u_char *pptr, char *buf, u_int buflen) 1185 { 1186 struct in6_addr addr; 1187 u_int plen; 1188 1189 ND_TCHECK(pptr[0]); 1190 plen = pptr[0]; /* get prefix length */ 1191 1192 if ((24+64) > plen) 1193 return -1; 1194 1195 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1196 1197 if (128 < plen) 1198 return -1; 1199 1200 memset(&addr, 0, sizeof(addr)); 1201 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1202 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1203 if (plen % 8) { 1204 addr.s6_addr[(plen + 7) / 8 - 1] &= 1205 ((0xff00 >> (plen % 8)) & 0xff); 1206 } 1207 /* the label may get offsetted by 4 bits so lets shift it right */ 1208 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1209 bgp_vpn_rd_print(ndo, pptr+4), 1210 ip6addr_string(ndo, &addr), 1211 plen, 1212 EXTRACT_24BITS(pptr+1)>>4, 1213 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1214 1215 return 12 + (plen + 7) / 8; 1216 1217 trunc: 1218 return -2; 1219 } 1220 1221 static int 1222 decode_clnp_prefix(netdissect_options *ndo, 1223 const u_char *pptr, char *buf, u_int buflen) 1224 { 1225 uint8_t addr[19]; 1226 u_int plen; 1227 1228 ND_TCHECK(pptr[0]); 1229 plen = pptr[0]; /* get prefix length */ 1230 1231 if (152 < plen) 1232 return -1; 1233 1234 memset(&addr, 0, sizeof(addr)); 1235 ND_TCHECK2(pptr[4], (plen + 7) / 8); 1236 memcpy(&addr, &pptr[4], (plen + 7) / 8); 1237 if (plen % 8) { 1238 addr[(plen + 7) / 8 - 1] &= 1239 ((0xff00 >> (plen % 8)) & 0xff); 1240 } 1241 snprintf(buf, buflen, "%s/%d", 1242 isonsap_string(ndo, addr,(plen + 7) / 8), 1243 plen); 1244 1245 return 1 + (plen + 7) / 8; 1246 1247 trunc: 1248 return -2; 1249 } 1250 1251 static int 1252 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo, 1253 const u_char *pptr, char *buf, u_int buflen) 1254 { 1255 uint8_t addr[19]; 1256 u_int plen; 1257 1258 ND_TCHECK(pptr[0]); 1259 plen = pptr[0]; /* get prefix length */ 1260 1261 if ((24+64) > plen) 1262 return -1; 1263 1264 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1265 1266 if (152 < plen) 1267 return -1; 1268 1269 memset(&addr, 0, sizeof(addr)); 1270 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1271 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1272 if (plen % 8) { 1273 addr[(plen + 7) / 8 - 1] &= 1274 ((0xff00 >> (plen % 8)) & 0xff); 1275 } 1276 /* the label may get offsetted by 4 bits so lets shift it right */ 1277 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1278 bgp_vpn_rd_print(ndo, pptr+4), 1279 isonsap_string(ndo, addr,(plen + 7) / 8), 1280 plen, 1281 EXTRACT_24BITS(pptr+1)>>4, 1282 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1283 1284 return 12 + (plen + 7) / 8; 1285 1286 trunc: 1287 return -2; 1288 } 1289 1290 /* 1291 * bgp_attr_get_as_size 1292 * 1293 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as 1294 * both Old speakers that do not support 4 byte AS, and the new speakers that do 1295 * support, exchange AS-Path with the same path-attribute type value 0x02. 1296 */ 1297 static int 1298 bgp_attr_get_as_size(netdissect_options *ndo, 1299 uint8_t bgpa_type, const u_char *pptr, int len) 1300 { 1301 const u_char *tptr = pptr; 1302 1303 /* 1304 * If the path attribute is the optional AS4 path type, then we already 1305 * know, that ASs must be encoded in 4 byte format. 1306 */ 1307 if (bgpa_type == BGPTYPE_AS4_PATH) { 1308 return 4; 1309 } 1310 1311 /* 1312 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path 1313 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes 1314 * each. 1315 */ 1316 while (tptr < pptr + len) { 1317 ND_TCHECK(tptr[0]); 1318 1319 /* 1320 * If we do not find a valid segment type, our guess might be wrong. 1321 */ 1322 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) { 1323 goto trunc; 1324 } 1325 ND_TCHECK(tptr[1]); 1326 tptr += 2 + tptr[1] * 2; 1327 } 1328 1329 /* 1330 * If we correctly reached end of the AS path attribute data content, 1331 * then most likely ASs were indeed encoded as 2 bytes. 1332 */ 1333 if (tptr == pptr + len) { 1334 return 2; 1335 } 1336 1337 trunc: 1338 1339 /* 1340 * We can come here, either we did not have enough data, or if we 1341 * try to decode 4 byte ASs in 2 byte format. Either way, return 4, 1342 * so that calller can try to decode each AS as of 4 bytes. If indeed 1343 * there was not enough data, it will crib and end the parse anyways. 1344 */ 1345 return 4; 1346 } 1347 1348 static int 1349 bgp_attr_print(netdissect_options *ndo, 1350 u_int atype, const u_char *pptr, u_int len) 1351 { 1352 int i; 1353 uint16_t af; 1354 uint8_t safi, snpa, nhlen; 1355 union { /* copy buffer for bandwidth values */ 1356 float f; 1357 uint32_t i; 1358 } bw; 1359 int advance; 1360 u_int tlen; 1361 const u_char *tptr; 1362 char buf[MAXHOSTNAMELEN + 100]; 1363 int as_size; 1364 1365 tptr = pptr; 1366 tlen=len; 1367 1368 switch (atype) { 1369 case BGPTYPE_ORIGIN: 1370 if (len != 1) 1371 ND_PRINT((ndo, "invalid len")); 1372 else { 1373 ND_TCHECK(*tptr); 1374 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values, 1375 "Unknown Origin Typecode", 1376 tptr[0]))); 1377 } 1378 break; 1379 1380 /* 1381 * Process AS4 byte path and AS2 byte path attributes here. 1382 */ 1383 case BGPTYPE_AS4_PATH: 1384 case BGPTYPE_AS_PATH: 1385 if (len % 2) { 1386 ND_PRINT((ndo, "invalid len")); 1387 break; 1388 } 1389 if (!len) { 1390 ND_PRINT((ndo, "empty")); 1391 break; 1392 } 1393 1394 /* 1395 * BGP updates exchanged between New speakers that support 4 1396 * byte AS, ASs are always encoded in 4 bytes. There is no 1397 * definitive way to find this, just by the packet's 1398 * contents. So, check for packet's TLV's sanity assuming 1399 * 2 bytes first, and it does not pass, assume that ASs are 1400 * encoded in 4 bytes format and move on. 1401 */ 1402 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); 1403 1404 while (tptr < pptr + len) { 1405 ND_TCHECK(tptr[0]); 1406 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values, 1407 "?", tptr[0]))); 1408 for (i = 0; i < tptr[1] * as_size; i += as_size) { 1409 ND_TCHECK2(tptr[2 + i], as_size); 1410 ND_PRINT((ndo, "%s ", 1411 as_printf(ndo, astostr, sizeof(astostr), 1412 as_size == 2 ? 1413 EXTRACT_16BITS(&tptr[2 + i]) : 1414 EXTRACT_32BITS(&tptr[2 + i])))); 1415 } 1416 ND_TCHECK(tptr[0]); 1417 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values, 1418 "?", tptr[0]))); 1419 ND_TCHECK(tptr[1]); 1420 tptr += 2 + tptr[1] * as_size; 1421 } 1422 break; 1423 case BGPTYPE_NEXT_HOP: 1424 if (len != 4) 1425 ND_PRINT((ndo, "invalid len")); 1426 else { 1427 ND_TCHECK2(tptr[0], 4); 1428 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr))); 1429 } 1430 break; 1431 case BGPTYPE_MULTI_EXIT_DISC: 1432 case BGPTYPE_LOCAL_PREF: 1433 if (len != 4) 1434 ND_PRINT((ndo, "invalid len")); 1435 else { 1436 ND_TCHECK2(tptr[0], 4); 1437 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr))); 1438 } 1439 break; 1440 case BGPTYPE_ATOMIC_AGGREGATE: 1441 if (len != 0) 1442 ND_PRINT((ndo, "invalid len")); 1443 break; 1444 case BGPTYPE_AGGREGATOR: 1445 1446 /* 1447 * Depending on the AS encoded is of 2 bytes or of 4 bytes, 1448 * the length of this PA can be either 6 bytes or 8 bytes. 1449 */ 1450 if (len != 6 && len != 8) { 1451 ND_PRINT((ndo, "invalid len")); 1452 break; 1453 } 1454 ND_TCHECK2(tptr[0], len); 1455 if (len == 6) { 1456 ND_PRINT((ndo, " AS #%s, origin %s", 1457 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)), 1458 ipaddr_string(ndo, tptr + 2))); 1459 } else { 1460 ND_PRINT((ndo, " AS #%s, origin %s", 1461 as_printf(ndo, astostr, sizeof(astostr), 1462 EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4))); 1463 } 1464 break; 1465 case BGPTYPE_AGGREGATOR4: 1466 if (len != 8) { 1467 ND_PRINT((ndo, "invalid len")); 1468 break; 1469 } 1470 ND_TCHECK2(tptr[0], 8); 1471 ND_PRINT((ndo, " AS #%s, origin %s", 1472 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)), 1473 ipaddr_string(ndo, tptr + 4))); 1474 break; 1475 case BGPTYPE_COMMUNITIES: 1476 if (len % 4) { 1477 ND_PRINT((ndo, "invalid len")); 1478 break; 1479 } 1480 while (tlen>0) { 1481 uint32_t comm; 1482 ND_TCHECK2(tptr[0], 4); 1483 comm = EXTRACT_32BITS(tptr); 1484 switch (comm) { 1485 case BGP_COMMUNITY_NO_EXPORT: 1486 ND_PRINT((ndo, " NO_EXPORT")); 1487 break; 1488 case BGP_COMMUNITY_NO_ADVERT: 1489 ND_PRINT((ndo, " NO_ADVERTISE")); 1490 break; 1491 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: 1492 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED")); 1493 break; 1494 default: 1495 ND_PRINT((ndo, "%u:%u%s", 1496 (comm >> 16) & 0xffff, 1497 comm & 0xffff, 1498 (tlen>4) ? ", " : "")); 1499 break; 1500 } 1501 tlen -=4; 1502 tptr +=4; 1503 } 1504 break; 1505 case BGPTYPE_ORIGINATOR_ID: 1506 if (len != 4) { 1507 ND_PRINT((ndo, "invalid len")); 1508 break; 1509 } 1510 ND_TCHECK2(tptr[0], 4); 1511 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr))); 1512 break; 1513 case BGPTYPE_CLUSTER_LIST: 1514 if (len % 4) { 1515 ND_PRINT((ndo, "invalid len")); 1516 break; 1517 } 1518 while (tlen>0) { 1519 ND_TCHECK2(tptr[0], 4); 1520 ND_PRINT((ndo, "%s%s", 1521 ipaddr_string(ndo, tptr), 1522 (tlen>4) ? ", " : "")); 1523 tlen -=4; 1524 tptr +=4; 1525 } 1526 break; 1527 case BGPTYPE_MP_REACH_NLRI: 1528 ND_TCHECK2(tptr[0], 3); 1529 af = EXTRACT_16BITS(tptr); 1530 safi = tptr[2]; 1531 1532 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1533 tok2str(af_values, "Unknown AFI", af), 1534 af, 1535 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1536 tok2str(bgp_safi_values, "Unknown SAFI", safi), 1537 safi)); 1538 1539 switch(af<<8 | safi) { 1540 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1541 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1542 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1543 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1544 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1545 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1546 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1547 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1548 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1549 case (AFNUM_INET<<8 | SAFNUM_MDT): 1550 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1551 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1552 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1553 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1554 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1555 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1556 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1557 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1558 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1559 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1560 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1561 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1562 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1563 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1564 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1565 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1566 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1567 break; 1568 default: 1569 ND_TCHECK2(tptr[0], tlen); 1570 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1571 if (ndo->ndo_vflag <= 1) 1572 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1573 goto done; 1574 break; 1575 } 1576 1577 tptr +=3; 1578 1579 ND_TCHECK(tptr[0]); 1580 nhlen = tptr[0]; 1581 tlen = nhlen; 1582 tptr++; 1583 1584 if (tlen) { 1585 int nnh = 0; 1586 ND_PRINT((ndo, "\n\t nexthop: ")); 1587 while (tlen > 0) { 1588 if ( nnh++ > 0 ) { 1589 ND_PRINT((ndo, ", " )); 1590 } 1591 switch(af<<8 | safi) { 1592 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1593 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1594 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1595 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1596 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1597 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1598 case (AFNUM_INET<<8 | SAFNUM_MDT): 1599 if (tlen < (int)sizeof(struct in_addr)) { 1600 ND_PRINT((ndo, "invalid len")); 1601 tlen = 0; 1602 } else { 1603 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1604 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr))); 1605 tlen -= sizeof(struct in_addr); 1606 tptr += sizeof(struct in_addr); 1607 } 1608 break; 1609 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1610 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1611 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1612 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { 1613 ND_PRINT((ndo, "invalid len")); 1614 tlen = 0; 1615 } else { 1616 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1617 ND_PRINT((ndo, "RD: %s, %s", 1618 bgp_vpn_rd_print(ndo, tptr), 1619 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN))); 1620 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1621 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1622 } 1623 break; 1624 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1625 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1626 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1627 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1628 if (tlen < (int)sizeof(struct in6_addr)) { 1629 ND_PRINT((ndo, "invalid len")); 1630 tlen = 0; 1631 } else { 1632 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)); 1633 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr))); 1634 tlen -= sizeof(struct in6_addr); 1635 tptr += sizeof(struct in6_addr); 1636 } 1637 break; 1638 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1639 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1640 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1641 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { 1642 ND_PRINT((ndo, "invalid len")); 1643 tlen = 0; 1644 } else { 1645 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1646 ND_PRINT((ndo, "RD: %s, %s", 1647 bgp_vpn_rd_print(ndo, tptr), 1648 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN))); 1649 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1650 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1651 } 1652 break; 1653 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1654 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1655 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1656 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1657 if (tlen < (int)sizeof(struct in_addr)) { 1658 ND_PRINT((ndo, "invalid len")); 1659 tlen = 0; 1660 } else { 1661 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1662 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr))); 1663 tlen -= (sizeof(struct in_addr)); 1664 tptr += (sizeof(struct in_addr)); 1665 } 1666 break; 1667 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1668 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1669 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1670 ND_TCHECK2(tptr[0], tlen); 1671 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen))); 1672 tptr += tlen; 1673 tlen = 0; 1674 break; 1675 1676 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1677 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1678 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1679 if (tlen < BGP_VPN_RD_LEN+1) { 1680 ND_PRINT((ndo, "invalid len")); 1681 tlen = 0; 1682 } else { 1683 ND_TCHECK2(tptr[0], tlen); 1684 ND_PRINT((ndo, "RD: %s, %s", 1685 bgp_vpn_rd_print(ndo, tptr), 1686 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN))); 1687 /* rfc986 mapped IPv4 address ? */ 1688 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601) 1689 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4))); 1690 /* rfc1888 mapped IPv6 address ? */ 1691 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000) 1692 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3))); 1693 tptr += tlen; 1694 tlen = 0; 1695 } 1696 break; 1697 default: 1698 ND_TCHECK2(tptr[0], tlen); 1699 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi)); 1700 if (ndo->ndo_vflag <= 1) 1701 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1702 tptr += tlen; 1703 tlen = 0; 1704 goto done; 1705 break; 1706 } 1707 } 1708 } 1709 ND_PRINT((ndo, ", nh-length: %u", nhlen)); 1710 tptr += tlen; 1711 1712 ND_TCHECK(tptr[0]); 1713 snpa = tptr[0]; 1714 tptr++; 1715 1716 if (snpa) { 1717 ND_PRINT((ndo, "\n\t %u SNPA", snpa)); 1718 for (/*nothing*/; snpa > 0; snpa--) { 1719 ND_TCHECK(tptr[0]); 1720 ND_PRINT((ndo, "\n\t %d bytes", tptr[0])); 1721 tptr += tptr[0] + 1; 1722 } 1723 } else { 1724 ND_PRINT((ndo, ", no SNPA")); 1725 } 1726 1727 while (len - (tptr - pptr) > 0) { 1728 switch (af<<8 | safi) { 1729 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1730 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1731 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1732 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1733 if (advance == -1) 1734 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1735 else if (advance == -2) 1736 goto trunc; 1737 else if (advance == -3) 1738 break; /* bytes left, but not enough */ 1739 else 1740 ND_PRINT((ndo, "\n\t %s", buf)); 1741 break; 1742 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1743 advance = decode_labeled_prefix4(ndo, tptr, len, 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 if (advance == -3) 1749 break; /* bytes left, but not enough */ 1750 else 1751 ND_PRINT((ndo, "\n\t %s", buf)); 1752 break; 1753 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1754 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1755 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1756 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1757 if (advance == -1) 1758 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1759 else if (advance == -2) 1760 goto trunc; 1761 else 1762 ND_PRINT((ndo, "\n\t %s", buf)); 1763 break; 1764 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1765 advance = decode_rt_routing_info(ndo, tptr, 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 1771 ND_PRINT((ndo, "\n\t %s", buf)); 1772 break; 1773 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1774 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1775 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 1776 if (advance == -1) 1777 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1778 else if (advance == -2) 1779 goto trunc; 1780 else 1781 ND_PRINT((ndo, "\n\t %s", buf)); 1782 break; 1783 1784 case (AFNUM_INET<<8 | SAFNUM_MDT): 1785 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 1786 if (advance == -1) 1787 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1788 else if (advance == -2) 1789 goto trunc; 1790 else 1791 ND_PRINT((ndo, "\n\t %s", buf)); 1792 break; 1793 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1794 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1795 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1796 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1797 if (advance == -1) 1798 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1799 else if (advance == -2) 1800 goto trunc; 1801 else if (advance == -3) 1802 break; /* bytes left, but not enough */ 1803 else 1804 ND_PRINT((ndo, "\n\t %s", buf)); 1805 break; 1806 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1807 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1808 if (advance == -1) 1809 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1810 else if (advance == -2) 1811 goto trunc; 1812 else if (advance == -3) 1813 break; /* bytes left, but not enough */ 1814 else 1815 ND_PRINT((ndo, "\n\t %s", buf)); 1816 break; 1817 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1818 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1819 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1820 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1821 if (advance == -1) 1822 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1823 else if (advance == -2) 1824 goto trunc; 1825 else 1826 ND_PRINT((ndo, "\n\t %s", buf)); 1827 break; 1828 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1829 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1830 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1831 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1832 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1833 if (advance == -1) 1834 ND_PRINT((ndo, "\n\t (illegal length)")); 1835 else if (advance == -2) 1836 goto trunc; 1837 else 1838 ND_PRINT((ndo, "\n\t %s", buf)); 1839 break; 1840 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1841 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1842 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1843 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1844 if (advance == -1) 1845 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1846 else if (advance == -2) 1847 goto trunc; 1848 else 1849 ND_PRINT((ndo, "\n\t %s", buf)); 1850 break; 1851 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1852 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1853 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1854 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1855 if (advance == -1) 1856 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1857 else if (advance == -2) 1858 goto trunc; 1859 else 1860 ND_PRINT((ndo, "\n\t %s", buf)); 1861 break; 1862 default: 1863 ND_TCHECK2(*tptr,tlen); 1864 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1865 if (ndo->ndo_vflag <= 1) 1866 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1867 advance = 0; 1868 tptr = pptr + len; 1869 break; 1870 } 1871 if (advance < 0) 1872 break; 1873 tptr += advance; 1874 } 1875 done: 1876 break; 1877 1878 case BGPTYPE_MP_UNREACH_NLRI: 1879 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE); 1880 af = EXTRACT_16BITS(tptr); 1881 safi = tptr[2]; 1882 1883 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1884 tok2str(af_values, "Unknown AFI", af), 1885 af, 1886 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1887 tok2str(bgp_safi_values, "Unknown SAFI", safi), 1888 safi)); 1889 1890 if (len == BGP_MP_NLRI_MINSIZE) 1891 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 1892 1893 tptr += 3; 1894 1895 while (len - (tptr - pptr) > 0) { 1896 switch (af<<8 | safi) { 1897 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1898 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1899 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1900 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1901 if (advance == -1) 1902 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1903 else if (advance == -2) 1904 goto trunc; 1905 else if (advance == -3) 1906 break; /* bytes left, but not enough */ 1907 else 1908 ND_PRINT((ndo, "\n\t %s", buf)); 1909 break; 1910 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1911 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1912 if (advance == -1) 1913 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1914 else if (advance == -2) 1915 goto trunc; 1916 else if (advance == -3) 1917 break; /* bytes left, but not enough */ 1918 else 1919 ND_PRINT((ndo, "\n\t %s", buf)); 1920 break; 1921 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1922 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1923 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1924 advance = decode_labeled_vpn_prefix4(ndo, tptr, 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 1930 ND_PRINT((ndo, "\n\t %s", buf)); 1931 break; 1932 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1933 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1934 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1935 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1936 if (advance == -1) 1937 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1938 else if (advance == -2) 1939 goto trunc; 1940 else if (advance == -3) 1941 break; /* bytes left, but not enough */ 1942 else 1943 ND_PRINT((ndo, "\n\t %s", buf)); 1944 break; 1945 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1946 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1947 if (advance == -1) 1948 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1949 else if (advance == -2) 1950 goto trunc; 1951 else if (advance == -3) 1952 break; /* bytes left, but not enough */ 1953 else 1954 ND_PRINT((ndo, "\n\t %s", buf)); 1955 break; 1956 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1957 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1958 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1959 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1960 if (advance == -1) 1961 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1962 else if (advance == -2) 1963 goto trunc; 1964 else 1965 ND_PRINT((ndo, "\n\t %s", buf)); 1966 break; 1967 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1968 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1969 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1970 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1971 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1972 if (advance == -1) 1973 ND_PRINT((ndo, "\n\t (illegal length)")); 1974 else if (advance == -2) 1975 goto trunc; 1976 else 1977 ND_PRINT((ndo, "\n\t %s", buf)); 1978 break; 1979 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1980 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1981 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1982 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1983 if (advance == -1) 1984 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1985 else if (advance == -2) 1986 goto trunc; 1987 else 1988 ND_PRINT((ndo, "\n\t %s", buf)); 1989 break; 1990 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1991 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1992 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1993 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1994 if (advance == -1) 1995 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1996 else if (advance == -2) 1997 goto trunc; 1998 else 1999 ND_PRINT((ndo, "\n\t %s", buf)); 2000 break; 2001 case (AFNUM_INET<<8 | SAFNUM_MDT): 2002 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 2003 if (advance == -1) 2004 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2005 else if (advance == -2) 2006 goto trunc; 2007 else 2008 ND_PRINT((ndo, "\n\t %s", buf)); 2009 break; 2010 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 2011 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 2012 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 2013 if (advance == -1) 2014 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2015 else if (advance == -2) 2016 goto trunc; 2017 else 2018 ND_PRINT((ndo, "\n\t %s", buf)); 2019 break; 2020 default: 2021 ND_TCHECK2(*(tptr-3),tlen); 2022 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi)); 2023 if (ndo->ndo_vflag <= 1) 2024 print_unknown_data(ndo, tptr-3, "\n\t ", tlen); 2025 advance = 0; 2026 tptr = pptr + len; 2027 break; 2028 } 2029 if (advance < 0) 2030 break; 2031 tptr += advance; 2032 } 2033 break; 2034 case BGPTYPE_EXTD_COMMUNITIES: 2035 if (len % 8) { 2036 ND_PRINT((ndo, "invalid len")); 2037 break; 2038 } 2039 while (tlen>0) { 2040 uint16_t extd_comm; 2041 2042 ND_TCHECK2(tptr[0], 2); 2043 extd_comm=EXTRACT_16BITS(tptr); 2044 2045 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]", 2046 tok2str(bgp_extd_comm_subtype_values, 2047 "unknown extd community typecode", 2048 extd_comm), 2049 extd_comm, 2050 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm))); 2051 2052 ND_TCHECK2(*(tptr+2), 6); 2053 switch(extd_comm) { 2054 case BGP_EXT_COM_RT_0: 2055 case BGP_EXT_COM_RO_0: 2056 case BGP_EXT_COM_L2VPN_RT_0: 2057 ND_PRINT((ndo, ": %u:%u (= %s)", 2058 EXTRACT_16BITS(tptr+2), 2059 EXTRACT_32BITS(tptr+4), 2060 ipaddr_string(ndo, tptr+4))); 2061 break; 2062 case BGP_EXT_COM_RT_1: 2063 case BGP_EXT_COM_RO_1: 2064 case BGP_EXT_COM_L2VPN_RT_1: 2065 case BGP_EXT_COM_VRF_RT_IMP: 2066 ND_PRINT((ndo, ": %s:%u", 2067 ipaddr_string(ndo, tptr+2), 2068 EXTRACT_16BITS(tptr+6))); 2069 break; 2070 case BGP_EXT_COM_RT_2: 2071 case BGP_EXT_COM_RO_2: 2072 ND_PRINT((ndo, ": %s:%u", 2073 as_printf(ndo, astostr, sizeof(astostr), 2074 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6))); 2075 break; 2076 case BGP_EXT_COM_LINKBAND: 2077 bw.i = EXTRACT_32BITS(tptr+2); 2078 ND_PRINT((ndo, ": bandwidth: %.3f Mbps", 2079 bw.f*8/1000000)); 2080 break; 2081 case BGP_EXT_COM_VPN_ORIGIN: 2082 case BGP_EXT_COM_VPN_ORIGIN2: 2083 case BGP_EXT_COM_VPN_ORIGIN3: 2084 case BGP_EXT_COM_VPN_ORIGIN4: 2085 case BGP_EXT_COM_OSPF_RID: 2086 case BGP_EXT_COM_OSPF_RID2: 2087 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2))); 2088 break; 2089 case BGP_EXT_COM_OSPF_RTYPE: 2090 case BGP_EXT_COM_OSPF_RTYPE2: 2091 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s", 2092 ipaddr_string(ndo, tptr+2), 2093 tok2str(bgp_extd_comm_ospf_rtype_values, 2094 "unknown (0x%02x)", 2095 *(tptr+6)), 2096 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", 2097 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "")); 2098 break; 2099 case BGP_EXT_COM_L2INFO: 2100 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u", 2101 tok2str(l2vpn_encaps_values, 2102 "unknown encaps", 2103 *(tptr+2)), 2104 *(tptr+3), 2105 EXTRACT_16BITS(tptr+4))); 2106 break; 2107 case BGP_EXT_COM_SOURCE_AS: 2108 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2))); 2109 break; 2110 default: 2111 ND_TCHECK2(*tptr,8); 2112 print_unknown_data(ndo, tptr, "\n\t ", 8); 2113 break; 2114 } 2115 tlen -=8; 2116 tptr +=8; 2117 } 2118 break; 2119 2120 case BGPTYPE_PMSI_TUNNEL: 2121 { 2122 uint8_t tunnel_type, flags; 2123 2124 tunnel_type = *(tptr+1); 2125 flags = *tptr; 2126 tlen = len; 2127 2128 ND_TCHECK2(tptr[0], 5); 2129 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", 2130 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), 2131 tunnel_type, 2132 bittok2str(bgp_pmsi_flag_values, "none", flags), 2133 EXTRACT_24BITS(tptr+2)>>4)); 2134 2135 tptr +=5; 2136 tlen -= 5; 2137 2138 switch (tunnel_type) { 2139 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ 2140 case BGP_PMSI_TUNNEL_PIM_BIDIR: 2141 ND_TCHECK2(tptr[0], 8); 2142 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s", 2143 ipaddr_string(ndo, tptr), 2144 ipaddr_string(ndo, tptr+4))); 2145 break; 2146 2147 case BGP_PMSI_TUNNEL_PIM_SSM: 2148 ND_TCHECK2(tptr[0], 8); 2149 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s", 2150 ipaddr_string(ndo, tptr), 2151 ipaddr_string(ndo, tptr+4))); 2152 break; 2153 case BGP_PMSI_TUNNEL_INGRESS: 2154 ND_TCHECK2(tptr[0], 4); 2155 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s", 2156 ipaddr_string(ndo, tptr))); 2157 break; 2158 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ 2159 case BGP_PMSI_TUNNEL_LDP_MP2MP: 2160 ND_TCHECK2(tptr[0], 8); 2161 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x", 2162 ipaddr_string(ndo, tptr), 2163 EXTRACT_32BITS(tptr+4))); 2164 break; 2165 case BGP_PMSI_TUNNEL_RSVP_P2MP: 2166 ND_TCHECK2(tptr[0], 8); 2167 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", 2168 ipaddr_string(ndo, tptr), 2169 EXTRACT_32BITS(tptr+4))); 2170 break; 2171 default: 2172 if (ndo->ndo_vflag <= 1) { 2173 print_unknown_data(ndo, tptr, "\n\t ", tlen); 2174 } 2175 } 2176 break; 2177 } 2178 case BGPTYPE_AIGP: 2179 { 2180 uint8_t type; 2181 uint16_t length; 2182 2183 ND_TCHECK2(tptr[0], 3); 2184 2185 tlen = len; 2186 2187 while (tlen >= 3) { 2188 2189 type = *tptr; 2190 length = EXTRACT_16BITS(tptr+1); 2191 2192 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u", 2193 tok2str(bgp_aigp_values, "Unknown", type), 2194 type, length)); 2195 2196 /* 2197 * Check if we can read the TLV data. 2198 */ 2199 ND_TCHECK2(tptr[3], length - 3); 2200 2201 switch (type) { 2202 2203 case BGP_AIGP_TLV: 2204 ND_TCHECK2(tptr[3], 8); 2205 ND_PRINT((ndo, ", metric %" PRIu64, 2206 EXTRACT_64BITS(tptr+3))); 2207 break; 2208 2209 default: 2210 if (ndo->ndo_vflag <= 1) { 2211 print_unknown_data(ndo, tptr+3,"\n\t ", length-3); 2212 } 2213 } 2214 2215 tptr += length; 2216 tlen -= length; 2217 } 2218 break; 2219 } 2220 case BGPTYPE_ATTR_SET: 2221 ND_TCHECK2(tptr[0], 4); 2222 if (len < 4) 2223 goto trunc; 2224 ND_PRINT((ndo, "\n\t Origin AS: %s", 2225 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)))); 2226 tptr+=4; 2227 len -=4; 2228 2229 while (len) { 2230 u_int aflags, alenlen, alen; 2231 2232 ND_TCHECK2(tptr[0], 2); 2233 if (len < 2) 2234 goto trunc; 2235 aflags = *tptr; 2236 atype = *(tptr + 1); 2237 tptr += 2; 2238 len -= 2; 2239 alenlen = bgp_attr_lenlen(aflags, tptr); 2240 ND_TCHECK2(tptr[0], alenlen); 2241 if (len < alenlen) 2242 goto trunc; 2243 alen = bgp_attr_len(aflags, tptr); 2244 tptr += alenlen; 2245 len -= alenlen; 2246 2247 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2248 tok2str(bgp_attr_values, 2249 "Unknown Attribute", atype), 2250 atype, 2251 alen)); 2252 2253 if (aflags) { 2254 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2255 aflags & 0x80 ? "O" : "", 2256 aflags & 0x40 ? "T" : "", 2257 aflags & 0x20 ? "P" : "", 2258 aflags & 0x10 ? "E" : "")); 2259 if (aflags & 0xf) 2260 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2261 ND_PRINT((ndo, "]: ")); 2262 } 2263 /* FIXME check for recursion */ 2264 if (!bgp_attr_print(ndo, atype, tptr, alen)) 2265 return 0; 2266 tptr += alen; 2267 len -= alen; 2268 } 2269 break; 2270 2271 case BGPTYPE_LARGE_COMMUNITY: 2272 if (len == 0 || len % 12) { 2273 ND_PRINT((ndo, "invalid len")); 2274 break; 2275 } 2276 ND_PRINT((ndo, "\n\t ")); 2277 while (len > 0) { 2278 ND_TCHECK2(*tptr, 12); 2279 ND_PRINT((ndo, "%u:%u:%u%s", 2280 EXTRACT_32BITS(tptr), 2281 EXTRACT_32BITS(tptr + 4), 2282 EXTRACT_32BITS(tptr + 8), 2283 (len > 12) ? ", " : "")); 2284 tptr += 12; 2285 len -= 12; 2286 } 2287 break; 2288 default: 2289 ND_TCHECK2(*pptr,len); 2290 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */ 2291 if (ndo->ndo_vflag <= 1) 2292 print_unknown_data(ndo, pptr, "\n\t ", len); 2293 break; 2294 } 2295 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/ 2296 ND_TCHECK2(*pptr,len); 2297 print_unknown_data(ndo, pptr, "\n\t ", len); 2298 } 2299 return 1; 2300 2301 trunc: 2302 return 0; 2303 } 2304 2305 static void 2306 bgp_capabilities_print(netdissect_options *ndo, 2307 const u_char *opt, int caps_len) 2308 { 2309 int cap_type, cap_len, tcap_len, cap_offset; 2310 int i = 0; 2311 2312 while (i < caps_len) { 2313 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE); 2314 cap_type=opt[i]; 2315 cap_len=opt[i+1]; 2316 tcap_len=cap_len; 2317 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2318 tok2str(bgp_capcode_values, "Unknown", 2319 cap_type), 2320 cap_type, 2321 cap_len)); 2322 ND_TCHECK2(opt[i+2], cap_len); 2323 switch (cap_type) { 2324 case BGP_CAPCODE_MP: 2325 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)", 2326 tok2str(af_values, "Unknown", 2327 EXTRACT_16BITS(opt+i+2)), 2328 EXTRACT_16BITS(opt+i+2), 2329 tok2str(bgp_safi_values, "Unknown", 2330 opt[i+5]), 2331 opt[i+5])); 2332 break; 2333 case BGP_CAPCODE_RESTART: 2334 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us", 2335 ((opt[i+2])&0x80) ? "R" : "none", 2336 EXTRACT_16BITS(opt+i+2)&0xfff)); 2337 tcap_len-=2; 2338 cap_offset=4; 2339 while(tcap_len>=4) { 2340 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", 2341 tok2str(af_values,"Unknown", 2342 EXTRACT_16BITS(opt+i+cap_offset)), 2343 EXTRACT_16BITS(opt+i+cap_offset), 2344 tok2str(bgp_safi_values,"Unknown", 2345 opt[i+cap_offset+2]), 2346 opt[i+cap_offset+2], 2347 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" )); 2348 tcap_len-=4; 2349 cap_offset+=4; 2350 } 2351 break; 2352 case BGP_CAPCODE_RR: 2353 case BGP_CAPCODE_RR_CISCO: 2354 break; 2355 case BGP_CAPCODE_AS_NEW: 2356 2357 /* 2358 * Extract the 4 byte AS number encoded. 2359 */ 2360 if (cap_len == 4) { 2361 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s", 2362 as_printf(ndo, astostr, sizeof(astostr), 2363 EXTRACT_32BITS(opt + i + 2)))); 2364 } 2365 break; 2366 case BGP_CAPCODE_ADD_PATH: 2367 cap_offset=2; 2368 if (tcap_len == 0) { 2369 ND_PRINT((ndo, " (bogus)")); /* length */ 2370 break; 2371 } 2372 while (tcap_len > 0) { 2373 if (tcap_len < 4) { 2374 ND_PRINT((ndo, "\n\t\t(invalid)")); 2375 break; 2376 } 2377 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s", 2378 tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)), 2379 EXTRACT_16BITS(opt+i+cap_offset), 2380 tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]), 2381 opt[i+cap_offset+2], 2382 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3]) 2383 )); 2384 tcap_len-=4; 2385 cap_offset+=4; 2386 } 2387 break; 2388 default: 2389 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u", 2390 cap_type)); 2391 if (ndo->ndo_vflag <= 1) 2392 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2393 break; 2394 } 2395 if (ndo->ndo_vflag > 1 && cap_len > 0) { 2396 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2397 } 2398 i += BGP_CAP_HEADER_SIZE + cap_len; 2399 } 2400 return; 2401 2402 trunc: 2403 ND_PRINT((ndo, "[|BGP]")); 2404 } 2405 2406 static void 2407 bgp_open_print(netdissect_options *ndo, 2408 const u_char *dat, int length) 2409 { 2410 struct bgp_open bgpo; 2411 struct bgp_opt bgpopt; 2412 const u_char *opt; 2413 int i; 2414 2415 ND_TCHECK2(dat[0], BGP_OPEN_SIZE); 2416 memcpy(&bgpo, dat, BGP_OPEN_SIZE); 2417 2418 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version)); 2419 ND_PRINT((ndo, "my AS %s, ", 2420 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas)))); 2421 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime))); 2422 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id))); 2423 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen)); 2424 2425 /* some little sanity checking */ 2426 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) 2427 return; 2428 2429 /* ugly! */ 2430 opt = &((const struct bgp_open *)dat)->bgpo_optlen; 2431 opt++; 2432 2433 i = 0; 2434 while (i < bgpo.bgpo_optlen) { 2435 ND_TCHECK2(opt[i], BGP_OPT_SIZE); 2436 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); 2437 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { 2438 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len)); 2439 break; 2440 } 2441 2442 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u", 2443 tok2str(bgp_opt_values,"Unknown", 2444 bgpopt.bgpopt_type), 2445 bgpopt.bgpopt_type, 2446 bgpopt.bgpopt_len)); 2447 2448 /* now let's decode the options we know*/ 2449 switch(bgpopt.bgpopt_type) { 2450 2451 case BGP_OPT_CAP: 2452 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE], 2453 bgpopt.bgpopt_len); 2454 break; 2455 2456 case BGP_OPT_AUTH: 2457 default: 2458 ND_PRINT((ndo, "\n\t no decoder for option %u", 2459 bgpopt.bgpopt_type)); 2460 break; 2461 } 2462 i += BGP_OPT_SIZE + bgpopt.bgpopt_len; 2463 } 2464 return; 2465 trunc: 2466 ND_PRINT((ndo, "[|BGP]")); 2467 } 2468 2469 static void 2470 bgp_update_print(netdissect_options *ndo, 2471 const u_char *dat, int length) 2472 { 2473 struct bgp bgp; 2474 const u_char *p; 2475 int withdrawn_routes_len; 2476 int len; 2477 int i; 2478 2479 ND_TCHECK2(dat[0], BGP_SIZE); 2480 if (length < BGP_SIZE) 2481 goto trunc; 2482 memcpy(&bgp, dat, BGP_SIZE); 2483 p = dat + BGP_SIZE; /*XXX*/ 2484 length -= BGP_SIZE; 2485 2486 /* Unfeasible routes */ 2487 ND_TCHECK2(p[0], 2); 2488 if (length < 2) 2489 goto trunc; 2490 withdrawn_routes_len = EXTRACT_16BITS(p); 2491 p += 2; 2492 length -= 2; 2493 if (withdrawn_routes_len) { 2494 /* 2495 * Without keeping state from the original NLRI message, 2496 * it's not possible to tell if this a v4 or v6 route, 2497 * so only try to decode it if we're not v6 enabled. 2498 */ 2499 ND_TCHECK2(p[0], withdrawn_routes_len); 2500 if (length < withdrawn_routes_len) 2501 goto trunc; 2502 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len)); 2503 p += withdrawn_routes_len; 2504 length -= withdrawn_routes_len; 2505 } 2506 2507 ND_TCHECK2(p[0], 2); 2508 if (length < 2) 2509 goto trunc; 2510 len = EXTRACT_16BITS(p); 2511 p += 2; 2512 length -= 2; 2513 2514 if (withdrawn_routes_len == 0 && len == 0 && length == 0) { 2515 /* No withdrawn routes, no path attributes, no NLRI */ 2516 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 2517 return; 2518 } 2519 2520 if (len) { 2521 /* do something more useful!*/ 2522 while (len) { 2523 int aflags, atype, alenlen, alen; 2524 2525 ND_TCHECK2(p[0], 2); 2526 if (len < 2) 2527 goto trunc; 2528 if (length < 2) 2529 goto trunc; 2530 aflags = *p; 2531 atype = *(p + 1); 2532 p += 2; 2533 len -= 2; 2534 length -= 2; 2535 alenlen = bgp_attr_lenlen(aflags, p); 2536 ND_TCHECK2(p[0], alenlen); 2537 if (len < alenlen) 2538 goto trunc; 2539 if (length < alenlen) 2540 goto trunc; 2541 alen = bgp_attr_len(aflags, p); 2542 p += alenlen; 2543 len -= alenlen; 2544 length -= alenlen; 2545 2546 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2547 tok2str(bgp_attr_values, "Unknown Attribute", 2548 atype), 2549 atype, 2550 alen)); 2551 2552 if (aflags) { 2553 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2554 aflags & 0x80 ? "O" : "", 2555 aflags & 0x40 ? "T" : "", 2556 aflags & 0x20 ? "P" : "", 2557 aflags & 0x10 ? "E" : "")); 2558 if (aflags & 0xf) 2559 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2560 ND_PRINT((ndo, "]: ")); 2561 } 2562 if (len < alen) 2563 goto trunc; 2564 if (length < alen) 2565 goto trunc; 2566 if (!bgp_attr_print(ndo, atype, p, alen)) 2567 goto trunc; 2568 p += alen; 2569 len -= alen; 2570 length -= alen; 2571 } 2572 } 2573 2574 if (length) { 2575 /* 2576 * XXX - what if they're using the "Advertisement of 2577 * Multiple Paths in BGP" feature: 2578 * 2579 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/ 2580 * 2581 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06 2582 */ 2583 ND_PRINT((ndo, "\n\t Updated routes:")); 2584 while (length) { 2585 char buf[MAXHOSTNAMELEN + 100]; 2586 i = decode_prefix4(ndo, p, length, buf, sizeof(buf)); 2587 if (i == -1) { 2588 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2589 break; 2590 } else if (i == -2) 2591 goto trunc; 2592 else if (i == -3) 2593 goto trunc; /* bytes left, but not enough */ 2594 else { 2595 ND_PRINT((ndo, "\n\t %s", buf)); 2596 p += i; 2597 length -= i; 2598 } 2599 } 2600 } 2601 return; 2602 trunc: 2603 ND_PRINT((ndo, "[|BGP]")); 2604 } 2605 2606 static void 2607 bgp_notification_print(netdissect_options *ndo, 2608 const u_char *dat, int length) 2609 { 2610 struct bgp_notification bgpn; 2611 const u_char *tptr; 2612 2613 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); 2614 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); 2615 2616 /* some little sanity checking */ 2617 if (length<BGP_NOTIFICATION_SIZE) 2618 return; 2619 2620 ND_PRINT((ndo, ", %s (%u)", 2621 tok2str(bgp_notify_major_values, "Unknown Error", 2622 bgpn.bgpn_major), 2623 bgpn.bgpn_major)); 2624 2625 switch (bgpn.bgpn_major) { 2626 2627 case BGP_NOTIFY_MAJOR_MSG: 2628 ND_PRINT((ndo, ", subcode %s (%u)", 2629 tok2str(bgp_notify_minor_msg_values, "Unknown", 2630 bgpn.bgpn_minor), 2631 bgpn.bgpn_minor)); 2632 break; 2633 case BGP_NOTIFY_MAJOR_OPEN: 2634 ND_PRINT((ndo, ", subcode %s (%u)", 2635 tok2str(bgp_notify_minor_open_values, "Unknown", 2636 bgpn.bgpn_minor), 2637 bgpn.bgpn_minor)); 2638 break; 2639 case BGP_NOTIFY_MAJOR_UPDATE: 2640 ND_PRINT((ndo, ", subcode %s (%u)", 2641 tok2str(bgp_notify_minor_update_values, "Unknown", 2642 bgpn.bgpn_minor), 2643 bgpn.bgpn_minor)); 2644 break; 2645 case BGP_NOTIFY_MAJOR_FSM: 2646 ND_PRINT((ndo, " subcode %s (%u)", 2647 tok2str(bgp_notify_minor_fsm_values, "Unknown", 2648 bgpn.bgpn_minor), 2649 bgpn.bgpn_minor)); 2650 break; 2651 case BGP_NOTIFY_MAJOR_CAP: 2652 ND_PRINT((ndo, " subcode %s (%u)", 2653 tok2str(bgp_notify_minor_cap_values, "Unknown", 2654 bgpn.bgpn_minor), 2655 bgpn.bgpn_minor)); 2656 break; 2657 case BGP_NOTIFY_MAJOR_CEASE: 2658 ND_PRINT((ndo, ", subcode %s (%u)", 2659 tok2str(bgp_notify_minor_cease_values, "Unknown", 2660 bgpn.bgpn_minor), 2661 bgpn.bgpn_minor)); 2662 2663 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes 2664 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES 2665 */ 2666 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { 2667 tptr = dat + BGP_NOTIFICATION_SIZE; 2668 ND_TCHECK2(*tptr, 7); 2669 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", 2670 tok2str(af_values, "Unknown", 2671 EXTRACT_16BITS(tptr)), 2672 EXTRACT_16BITS(tptr), 2673 tok2str(bgp_safi_values, "Unknown", *(tptr+2)), 2674 *(tptr+2), 2675 EXTRACT_32BITS(tptr+3))); 2676 } 2677 break; 2678 default: 2679 break; 2680 } 2681 2682 return; 2683 trunc: 2684 ND_PRINT((ndo, "[|BGP]")); 2685 } 2686 2687 static void 2688 bgp_route_refresh_print(netdissect_options *ndo, 2689 const u_char *pptr, int len) 2690 { 2691 const struct bgp_route_refresh *bgp_route_refresh_header; 2692 2693 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE); 2694 2695 /* some little sanity checking */ 2696 if (len<BGP_ROUTE_REFRESH_SIZE) 2697 return; 2698 2699 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; 2700 2701 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)", 2702 tok2str(af_values,"Unknown", 2703 /* this stinks but the compiler pads the structure 2704 * weird */ 2705 EXTRACT_16BITS(&bgp_route_refresh_header->afi)), 2706 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2707 tok2str(bgp_safi_values,"Unknown", 2708 bgp_route_refresh_header->safi), 2709 bgp_route_refresh_header->safi)); 2710 2711 if (ndo->ndo_vflag > 1) { 2712 ND_TCHECK2(*pptr, len); 2713 print_unknown_data(ndo, pptr, "\n\t ", len); 2714 } 2715 2716 return; 2717 trunc: 2718 ND_PRINT((ndo, "[|BGP]")); 2719 } 2720 2721 static int 2722 bgp_header_print(netdissect_options *ndo, 2723 const u_char *dat, int length) 2724 { 2725 struct bgp bgp; 2726 2727 ND_TCHECK2(dat[0], BGP_SIZE); 2728 memcpy(&bgp, dat, BGP_SIZE); 2729 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u", 2730 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type), 2731 bgp.bgp_type, 2732 length)); 2733 2734 switch (bgp.bgp_type) { 2735 case BGP_OPEN: 2736 bgp_open_print(ndo, dat, length); 2737 break; 2738 case BGP_UPDATE: 2739 bgp_update_print(ndo, dat, length); 2740 break; 2741 case BGP_NOTIFICATION: 2742 bgp_notification_print(ndo, dat, length); 2743 break; 2744 case BGP_KEEPALIVE: 2745 break; 2746 case BGP_ROUTE_REFRESH: 2747 bgp_route_refresh_print(ndo, dat, length); 2748 break; 2749 default: 2750 /* we have no decoder for the BGP message */ 2751 ND_TCHECK2(*dat, length); 2752 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type)); 2753 print_unknown_data(ndo, dat, "\n\t ", length); 2754 break; 2755 } 2756 return 1; 2757 trunc: 2758 ND_PRINT((ndo, "[|BGP]")); 2759 return 0; 2760 } 2761 2762 void 2763 bgp_print(netdissect_options *ndo, 2764 const u_char *dat, int length) 2765 { 2766 const u_char *p; 2767 const u_char *ep; 2768 const u_char *start; 2769 const u_char marker[] = { 2770 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2771 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2772 }; 2773 struct bgp bgp; 2774 uint16_t hlen; 2775 2776 ep = dat + length; 2777 if (ndo->ndo_snapend < dat + length) 2778 ep = ndo->ndo_snapend; 2779 2780 ND_PRINT((ndo, ": BGP")); 2781 2782 if (ndo->ndo_vflag < 1) /* lets be less chatty */ 2783 return; 2784 2785 p = dat; 2786 start = p; 2787 while (p < ep) { 2788 if (!ND_TTEST2(p[0], 1)) 2789 break; 2790 if (p[0] != 0xff) { 2791 p++; 2792 continue; 2793 } 2794 2795 if (!ND_TTEST2(p[0], sizeof(marker))) 2796 break; 2797 if (memcmp(p, marker, sizeof(marker)) != 0) { 2798 p++; 2799 continue; 2800 } 2801 2802 /* found BGP header */ 2803 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/ 2804 memcpy(&bgp, p, BGP_SIZE); 2805 2806 if (start != p) 2807 ND_PRINT((ndo, " [|BGP]")); 2808 2809 hlen = ntohs(bgp.bgp_len); 2810 if (hlen < BGP_SIZE) { 2811 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen, 2812 BGP_SIZE)); 2813 break; 2814 } 2815 2816 if (ND_TTEST2(p[0], hlen)) { 2817 if (!bgp_header_print(ndo, p, hlen)) 2818 return; 2819 p += hlen; 2820 start = p; 2821 } else { 2822 ND_PRINT((ndo, "\n[|BGP %s]", 2823 tok2str(bgp_msg_values, 2824 "Unknown Message Type", 2825 bgp.bgp_type))); 2826 break; 2827 } 2828 } 2829 2830 return; 2831 2832 trunc: 2833 ND_PRINT((ndo, " [|BGP]")); 2834 } 2835 2836 /* 2837 * Local Variables: 2838 * c-style: whitesmith 2839 * c-basic-offset: 4 2840 * End: 2841 */ 2842