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@gredler.at) for more 30 * complete BGP support. 31 */ 32 33 #include <sys/cdefs.h> 34 #ifndef lint 35 __RCSID("$NetBSD: print-bgp.c,v 1.9 2017/09/08 14:01:12 christos 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 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */ 765 766 /* NLRI "prefix length" from RFC 2858 Section 4. */ 767 ND_TCHECK(pptr[0]); 768 plen = pptr[0]; /* get prefix length */ 769 770 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits. 771 * RFC 4684 Section 4 defines the layout of "origin AS" and "route 772 * target" fields inside the "prefix" depending on its length. 773 */ 774 if (0 == plen) { 775 /* Without "origin AS", without "route target". */ 776 snprintf(buf, buflen, "default route target"); 777 return 1; 778 } 779 780 if (32 > plen) 781 return -1; 782 783 /* With at least "origin AS", possibly with "route target". */ 784 ND_TCHECK_32BITS(pptr + 1); 785 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_32BITS(pptr + 1)); 786 787 plen-=32; /* adjust prefix length */ 788 789 if (64 < plen) 790 return -1; 791 792 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 } 793 * and gives the number of octets in the variable-length "route 794 * target" field inside this NLRI "prefix". Look for it. 795 */ 796 memset(&route_target, 0, sizeof(route_target)); 797 ND_TCHECK2(pptr[5], (plen + 7) / 8); 798 memcpy(&route_target, &pptr[5], (plen + 7) / 8); 799 /* Which specification says to do this? */ 800 if (plen % 8) { 801 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= 802 ((0xff00 >> (plen % 8)) & 0xff); 803 } 804 snprintf(buf, buflen, "origin AS: %s, route target %s", 805 asbuf, 806 bgp_vpn_rd_print(ndo, (u_char *)&route_target)); 807 808 return 5 + (plen + 7) / 8; 809 810 trunc: 811 return -2; 812 } 813 814 static int 815 decode_labeled_vpn_prefix4(netdissect_options *ndo, 816 const u_char *pptr, char *buf, u_int buflen) 817 { 818 struct in_addr addr; 819 u_int plen; 820 821 ND_TCHECK(pptr[0]); 822 plen = pptr[0]; /* get prefix length */ 823 824 if ((24+64) > plen) 825 return -1; 826 827 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 828 829 if (32 < plen) 830 return -1; 831 832 memset(&addr, 0, sizeof(addr)); 833 ND_TCHECK2(pptr[12], (plen + 7) / 8); 834 memcpy(&addr, &pptr[12], (plen + 7) / 8); 835 if (plen % 8) { 836 ((u_char *)&addr)[(plen + 7) / 8 - 1] &= 837 ((0xff00 >> (plen % 8)) & 0xff); 838 } 839 /* the label may get offsetted by 4 bits so lets shift it right */ 840 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 841 bgp_vpn_rd_print(ndo, pptr+4), 842 ipaddr_string(ndo, &addr), 843 plen, 844 EXTRACT_24BITS(pptr+1)>>4, 845 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 846 847 return 12 + (plen + 7) / 8; 848 849 trunc: 850 return -2; 851 } 852 853 /* 854 * +-------------------------------+ 855 * | | 856 * | RD:IPv4-address (12 octets) | 857 * | | 858 * +-------------------------------+ 859 * | MDT Group-address (4 octets) | 860 * +-------------------------------+ 861 */ 862 863 #define MDT_VPN_NLRI_LEN 16 864 865 static int 866 decode_mdt_vpn_nlri(netdissect_options *ndo, 867 const u_char *pptr, char *buf, u_int buflen) 868 { 869 870 const u_char *rd; 871 const u_char *vpn_ip; 872 873 ND_TCHECK(pptr[0]); 874 875 /* if the NLRI is not predefined length, quit.*/ 876 if (*pptr != MDT_VPN_NLRI_LEN * 8) 877 return -1; 878 pptr++; 879 880 /* RD */ 881 ND_TCHECK2(pptr[0], 8); 882 rd = pptr; 883 pptr+=8; 884 885 /* IPv4 address */ 886 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 887 vpn_ip = pptr; 888 pptr+=sizeof(struct in_addr); 889 890 /* MDT Group Address */ 891 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 892 893 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s", 894 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr)); 895 896 return MDT_VPN_NLRI_LEN + 1; 897 898 trunc: 899 900 return -2; 901 } 902 903 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1 904 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2 905 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3 906 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4 907 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5 908 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6 909 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7 910 911 static const struct tok bgp_multicast_vpn_route_type_values[] = { 912 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"}, 913 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"}, 914 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"}, 915 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"}, 916 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"}, 917 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"}, 918 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"}, 919 { 0, NULL} 920 }; 921 922 static int 923 decode_multicast_vpn(netdissect_options *ndo, 924 const u_char *pptr, char *buf, u_int buflen) 925 { 926 uint8_t route_type, route_length, addr_length, sg_length; 927 u_int offset; 928 929 ND_TCHECK2(pptr[0], 2); 930 route_type = *pptr++; 931 route_length = *pptr++; 932 933 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", 934 tok2str(bgp_multicast_vpn_route_type_values, 935 "Unknown", route_type), 936 route_type, route_length); 937 938 switch(route_type) { 939 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: 940 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 941 offset = strlen(buf); 942 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", 943 bgp_vpn_rd_print(ndo, pptr), 944 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN, 945 (route_length - BGP_VPN_RD_LEN) << 3)); 946 break; 947 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: 948 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); 949 offset = strlen(buf); 950 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 951 bgp_vpn_rd_print(ndo, pptr), 952 as_printf(ndo, astostr, sizeof(astostr), 953 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 954 break; 955 956 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: 957 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 958 offset = strlen(buf); 959 snprintf(buf + offset, buflen - offset, ", RD: %s", 960 bgp_vpn_rd_print(ndo, pptr)); 961 pptr += BGP_VPN_RD_LEN; 962 963 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen); 964 addr_length = route_length - sg_length; 965 966 ND_TCHECK2(pptr[0], addr_length); 967 offset = strlen(buf); 968 snprintf(buf + offset, buflen - offset, ", Originator %s", 969 bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); 970 break; 971 972 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: 973 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 974 offset = strlen(buf); 975 snprintf(buf + offset, buflen - offset, ", RD: %s", 976 bgp_vpn_rd_print(ndo, pptr)); 977 pptr += BGP_VPN_RD_LEN; 978 979 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 980 break; 981 982 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ 983 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: 984 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); 985 offset = strlen(buf); 986 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 987 bgp_vpn_rd_print(ndo, pptr), 988 as_printf(ndo, astostr, sizeof(astostr), 989 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 990 pptr += BGP_VPN_RD_LEN + 4; 991 992 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 993 break; 994 995 /* 996 * no per route-type printing yet. 997 */ 998 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: 999 default: 1000 break; 1001 } 1002 1003 return route_length + 2; 1004 1005 trunc: 1006 return -2; 1007 } 1008 1009 /* 1010 * As I remember, some versions of systems have an snprintf() that 1011 * returns -1 if the buffer would have overflowed. If the return 1012 * value is negative, set buflen to 0, to indicate that we've filled 1013 * the buffer up. 1014 * 1015 * If the return value is greater than buflen, that means that 1016 * the buffer would have overflowed; again, set buflen to 0 in 1017 * that case. 1018 */ 1019 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \ 1020 if (stringlen<0) \ 1021 buflen=0; \ 1022 else if ((u_int)stringlen>buflen) \ 1023 buflen=0; \ 1024 else { \ 1025 buflen-=stringlen; \ 1026 buf+=stringlen; \ 1027 } 1028 1029 static int 1030 decode_labeled_vpn_l2(netdissect_options *ndo, 1031 const u_char *pptr, char *buf, u_int buflen) 1032 { 1033 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len; 1034 1035 ND_TCHECK2(pptr[0], 2); 1036 plen=EXTRACT_16BITS(pptr); 1037 tlen=plen; 1038 pptr+=2; 1039 /* Old and new L2VPN NLRI share AFI/SAFI 1040 * -> Assume a 12 Byte-length NLRI is auto-discovery-only 1041 * and > 17 as old format. Complain for the middle case 1042 */ 1043 if (plen==12) { 1044 /* assume AD-only with RD, BGPNH */ 1045 ND_TCHECK2(pptr[0],12); 1046 buf[0]='\0'; 1047 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s", 1048 bgp_vpn_rd_print(ndo, pptr), 1049 ipaddr_string(ndo, pptr+8) 1050 ); 1051 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1052 pptr+=12; 1053 tlen-=12; 1054 return plen; 1055 } else if (plen>17) { 1056 /* assume old format */ 1057 /* RD, ID, LBLKOFF, LBLBASE */ 1058 1059 ND_TCHECK2(pptr[0],15); 1060 buf[0]='\0'; 1061 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", 1062 bgp_vpn_rd_print(ndo, pptr), 1063 EXTRACT_16BITS(pptr+8), 1064 EXTRACT_16BITS(pptr+10), 1065 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ 1066 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1067 pptr+=15; 1068 tlen-=15; 1069 1070 /* ok now the variable part - lets read out TLVs*/ 1071 while (tlen>0) { 1072 if (tlen < 3) 1073 return -1; 1074 ND_TCHECK2(pptr[0], 3); 1075 tlv_type=*pptr++; 1076 tlv_len=EXTRACT_16BITS(pptr); 1077 ttlv_len=tlv_len; 1078 pptr+=2; 1079 1080 switch(tlv_type) { 1081 case 1: 1082 if (buflen!=0) { 1083 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", 1084 tlv_type, 1085 tlv_len); 1086 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1087 } 1088 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */ 1089 while (ttlv_len>0) { 1090 ND_TCHECK(pptr[0]); 1091 if (buflen!=0) { 1092 stringlen=snprintf(buf,buflen, "%02x",*pptr++); 1093 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1094 } 1095 ttlv_len--; 1096 } 1097 break; 1098 default: 1099 if (buflen!=0) { 1100 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", 1101 tlv_type, 1102 tlv_len); 1103 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1104 } 1105 break; 1106 } 1107 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */ 1108 } 1109 return plen+2; 1110 1111 } else { 1112 /* complain bitterly ? */ 1113 /* fall through */ 1114 goto trunc; 1115 } 1116 1117 trunc: 1118 return -2; 1119 } 1120 1121 int 1122 decode_prefix6(netdissect_options *ndo, 1123 const u_char *pd, u_int itemlen, char *buf, u_int buflen) 1124 { 1125 struct in6_addr addr; 1126 u_int plen, plenbytes; 1127 1128 ND_TCHECK(pd[0]); 1129 ITEMCHECK(1); 1130 plen = pd[0]; 1131 if (128 < plen) 1132 return -1; 1133 itemlen -= 1; 1134 1135 memset(&addr, 0, sizeof(addr)); 1136 plenbytes = (plen + 7) / 8; 1137 ND_TCHECK2(pd[1], plenbytes); 1138 ITEMCHECK(plenbytes); 1139 memcpy(&addr, &pd[1], plenbytes); 1140 if (plen % 8) { 1141 addr.s6_addr[plenbytes - 1] &= 1142 ((0xff00 >> (plen % 8)) & 0xff); 1143 } 1144 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen); 1145 return 1 + plenbytes; 1146 1147 trunc: 1148 return -2; 1149 1150 badtlv: 1151 return -3; 1152 } 1153 1154 static int 1155 decode_labeled_prefix6(netdissect_options *ndo, 1156 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 1157 { 1158 struct in6_addr addr; 1159 u_int plen, plenbytes; 1160 1161 /* prefix length and label = 4 bytes */ 1162 ND_TCHECK2(pptr[0], 4); 1163 ITEMCHECK(4); 1164 plen = pptr[0]; /* get prefix length */ 1165 1166 if (24 > plen) 1167 return -1; 1168 1169 plen-=24; /* adjust prefixlen - labellength */ 1170 1171 if (128 < plen) 1172 return -1; 1173 itemlen -= 4; 1174 1175 memset(&addr, 0, sizeof(addr)); 1176 plenbytes = (plen + 7) / 8; 1177 ND_TCHECK2(pptr[4], plenbytes); 1178 memcpy(&addr, &pptr[4], plenbytes); 1179 if (plen % 8) { 1180 addr.s6_addr[plenbytes - 1] &= 1181 ((0xff00 >> (plen % 8)) & 0xff); 1182 } 1183 /* the label may get offsetted by 4 bits so lets shift it right */ 1184 snprintf(buf, buflen, "%s/%d, label:%u %s", 1185 ip6addr_string(ndo, &addr), 1186 plen, 1187 EXTRACT_24BITS(pptr+1)>>4, 1188 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1189 1190 return 4 + plenbytes; 1191 1192 trunc: 1193 return -2; 1194 1195 badtlv: 1196 return -3; 1197 } 1198 1199 static int 1200 decode_labeled_vpn_prefix6(netdissect_options *ndo, 1201 const u_char *pptr, char *buf, u_int buflen) 1202 { 1203 struct in6_addr addr; 1204 u_int plen; 1205 1206 ND_TCHECK(pptr[0]); 1207 plen = pptr[0]; /* get prefix length */ 1208 1209 if ((24+64) > plen) 1210 return -1; 1211 1212 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1213 1214 if (128 < plen) 1215 return -1; 1216 1217 memset(&addr, 0, sizeof(addr)); 1218 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1219 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1220 if (plen % 8) { 1221 addr.s6_addr[(plen + 7) / 8 - 1] &= 1222 ((0xff00 >> (plen % 8)) & 0xff); 1223 } 1224 /* the label may get offsetted by 4 bits so lets shift it right */ 1225 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1226 bgp_vpn_rd_print(ndo, pptr+4), 1227 ip6addr_string(ndo, &addr), 1228 plen, 1229 EXTRACT_24BITS(pptr+1)>>4, 1230 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1231 1232 return 12 + (plen + 7) / 8; 1233 1234 trunc: 1235 return -2; 1236 } 1237 1238 static int 1239 decode_clnp_prefix(netdissect_options *ndo, 1240 const u_char *pptr, char *buf, u_int buflen) 1241 { 1242 uint8_t addr[19]; 1243 u_int plen; 1244 1245 ND_TCHECK(pptr[0]); 1246 plen = pptr[0]; /* get prefix length */ 1247 1248 if (152 < plen) 1249 return -1; 1250 1251 memset(&addr, 0, sizeof(addr)); 1252 ND_TCHECK2(pptr[4], (plen + 7) / 8); 1253 memcpy(&addr, &pptr[4], (plen + 7) / 8); 1254 if (plen % 8) { 1255 addr[(plen + 7) / 8 - 1] &= 1256 ((0xff00 >> (plen % 8)) & 0xff); 1257 } 1258 snprintf(buf, buflen, "%s/%d", 1259 isonsap_string(ndo, addr,(plen + 7) / 8), 1260 plen); 1261 1262 return 1 + (plen + 7) / 8; 1263 1264 trunc: 1265 return -2; 1266 } 1267 1268 static int 1269 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo, 1270 const u_char *pptr, char *buf, u_int buflen) 1271 { 1272 uint8_t addr[19]; 1273 u_int plen; 1274 1275 ND_TCHECK(pptr[0]); 1276 plen = pptr[0]; /* get prefix length */ 1277 1278 if ((24+64) > plen) 1279 return -1; 1280 1281 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1282 1283 if (152 < plen) 1284 return -1; 1285 1286 memset(&addr, 0, sizeof(addr)); 1287 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1288 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1289 if (plen % 8) { 1290 addr[(plen + 7) / 8 - 1] &= 1291 ((0xff00 >> (plen % 8)) & 0xff); 1292 } 1293 /* the label may get offsetted by 4 bits so lets shift it right */ 1294 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1295 bgp_vpn_rd_print(ndo, pptr+4), 1296 isonsap_string(ndo, addr,(plen + 7) / 8), 1297 plen, 1298 EXTRACT_24BITS(pptr+1)>>4, 1299 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1300 1301 return 12 + (plen + 7) / 8; 1302 1303 trunc: 1304 return -2; 1305 } 1306 1307 /* 1308 * bgp_attr_get_as_size 1309 * 1310 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as 1311 * both Old speakers that do not support 4 byte AS, and the new speakers that do 1312 * support, exchange AS-Path with the same path-attribute type value 0x02. 1313 */ 1314 static int 1315 bgp_attr_get_as_size(netdissect_options *ndo, 1316 uint8_t bgpa_type, const u_char *pptr, int len) 1317 { 1318 const u_char *tptr = pptr; 1319 1320 /* 1321 * If the path attribute is the optional AS4 path type, then we already 1322 * know, that ASs must be encoded in 4 byte format. 1323 */ 1324 if (bgpa_type == BGPTYPE_AS4_PATH) { 1325 return 4; 1326 } 1327 1328 /* 1329 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path 1330 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes 1331 * each. 1332 */ 1333 while (tptr < pptr + len) { 1334 ND_TCHECK(tptr[0]); 1335 1336 /* 1337 * If we do not find a valid segment type, our guess might be wrong. 1338 */ 1339 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) { 1340 goto trunc; 1341 } 1342 ND_TCHECK(tptr[1]); 1343 tptr += 2 + tptr[1] * 2; 1344 } 1345 1346 /* 1347 * If we correctly reached end of the AS path attribute data content, 1348 * then most likely ASs were indeed encoded as 2 bytes. 1349 */ 1350 if (tptr == pptr + len) { 1351 return 2; 1352 } 1353 1354 trunc: 1355 1356 /* 1357 * We can come here, either we did not have enough data, or if we 1358 * try to decode 4 byte ASs in 2 byte format. Either way, return 4, 1359 * so that calller can try to decode each AS as of 4 bytes. If indeed 1360 * there was not enough data, it will crib and end the parse anyways. 1361 */ 1362 return 4; 1363 } 1364 1365 static int 1366 bgp_attr_print(netdissect_options *ndo, 1367 u_int atype, const u_char *pptr, u_int len) 1368 { 1369 int i; 1370 uint16_t af; 1371 uint8_t safi, snpa, nhlen; 1372 union { /* copy buffer for bandwidth values */ 1373 float f; 1374 uint32_t i; 1375 } bw; 1376 int advance; 1377 u_int tlen; 1378 const u_char *tptr; 1379 char buf[MAXHOSTNAMELEN + 100]; 1380 int as_size; 1381 1382 tptr = pptr; 1383 tlen=len; 1384 1385 switch (atype) { 1386 case BGPTYPE_ORIGIN: 1387 if (len != 1) 1388 ND_PRINT((ndo, "invalid len")); 1389 else { 1390 ND_TCHECK(*tptr); 1391 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values, 1392 "Unknown Origin Typecode", 1393 tptr[0]))); 1394 } 1395 break; 1396 1397 /* 1398 * Process AS4 byte path and AS2 byte path attributes here. 1399 */ 1400 case BGPTYPE_AS4_PATH: 1401 case BGPTYPE_AS_PATH: 1402 if (len % 2) { 1403 ND_PRINT((ndo, "invalid len")); 1404 break; 1405 } 1406 if (!len) { 1407 ND_PRINT((ndo, "empty")); 1408 break; 1409 } 1410 1411 /* 1412 * BGP updates exchanged between New speakers that support 4 1413 * byte AS, ASs are always encoded in 4 bytes. There is no 1414 * definitive way to find this, just by the packet's 1415 * contents. So, check for packet's TLV's sanity assuming 1416 * 2 bytes first, and it does not pass, assume that ASs are 1417 * encoded in 4 bytes format and move on. 1418 */ 1419 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); 1420 1421 while (tptr < pptr + len) { 1422 ND_TCHECK(tptr[0]); 1423 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values, 1424 "?", tptr[0]))); 1425 ND_TCHECK(tptr[1]); 1426 for (i = 0; i < tptr[1] * as_size; i += as_size) { 1427 ND_TCHECK2(tptr[2 + i], as_size); 1428 ND_PRINT((ndo, "%s ", 1429 as_printf(ndo, astostr, sizeof(astostr), 1430 as_size == 2 ? 1431 EXTRACT_16BITS(&tptr[2 + i]) : 1432 EXTRACT_32BITS(&tptr[2 + i])))); 1433 } 1434 ND_TCHECK(tptr[0]); 1435 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values, 1436 "?", tptr[0]))); 1437 ND_TCHECK(tptr[1]); 1438 tptr += 2 + tptr[1] * as_size; 1439 } 1440 break; 1441 case BGPTYPE_NEXT_HOP: 1442 if (len != 4) 1443 ND_PRINT((ndo, "invalid len")); 1444 else { 1445 ND_TCHECK2(tptr[0], 4); 1446 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr))); 1447 } 1448 break; 1449 case BGPTYPE_MULTI_EXIT_DISC: 1450 case BGPTYPE_LOCAL_PREF: 1451 if (len != 4) 1452 ND_PRINT((ndo, "invalid len")); 1453 else { 1454 ND_TCHECK2(tptr[0], 4); 1455 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr))); 1456 } 1457 break; 1458 case BGPTYPE_ATOMIC_AGGREGATE: 1459 if (len != 0) 1460 ND_PRINT((ndo, "invalid len")); 1461 break; 1462 case BGPTYPE_AGGREGATOR: 1463 1464 /* 1465 * Depending on the AS encoded is of 2 bytes or of 4 bytes, 1466 * the length of this PA can be either 6 bytes or 8 bytes. 1467 */ 1468 if (len != 6 && len != 8) { 1469 ND_PRINT((ndo, "invalid len")); 1470 break; 1471 } 1472 ND_TCHECK2(tptr[0], len); 1473 if (len == 6) { 1474 ND_PRINT((ndo, " AS #%s, origin %s", 1475 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)), 1476 ipaddr_string(ndo, tptr + 2))); 1477 } else { 1478 ND_PRINT((ndo, " AS #%s, origin %s", 1479 as_printf(ndo, astostr, sizeof(astostr), 1480 EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4))); 1481 } 1482 break; 1483 case BGPTYPE_AGGREGATOR4: 1484 if (len != 8) { 1485 ND_PRINT((ndo, "invalid len")); 1486 break; 1487 } 1488 ND_TCHECK2(tptr[0], 8); 1489 ND_PRINT((ndo, " AS #%s, origin %s", 1490 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)), 1491 ipaddr_string(ndo, tptr + 4))); 1492 break; 1493 case BGPTYPE_COMMUNITIES: 1494 if (len % 4) { 1495 ND_PRINT((ndo, "invalid len")); 1496 break; 1497 } 1498 while (tlen>0) { 1499 uint32_t comm; 1500 ND_TCHECK2(tptr[0], 4); 1501 comm = EXTRACT_32BITS(tptr); 1502 switch (comm) { 1503 case BGP_COMMUNITY_NO_EXPORT: 1504 ND_PRINT((ndo, " NO_EXPORT")); 1505 break; 1506 case BGP_COMMUNITY_NO_ADVERT: 1507 ND_PRINT((ndo, " NO_ADVERTISE")); 1508 break; 1509 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: 1510 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED")); 1511 break; 1512 default: 1513 ND_PRINT((ndo, "%u:%u%s", 1514 (comm >> 16) & 0xffff, 1515 comm & 0xffff, 1516 (tlen>4) ? ", " : "")); 1517 break; 1518 } 1519 tlen -=4; 1520 tptr +=4; 1521 } 1522 break; 1523 case BGPTYPE_ORIGINATOR_ID: 1524 if (len != 4) { 1525 ND_PRINT((ndo, "invalid len")); 1526 break; 1527 } 1528 ND_TCHECK2(tptr[0], 4); 1529 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr))); 1530 break; 1531 case BGPTYPE_CLUSTER_LIST: 1532 if (len % 4) { 1533 ND_PRINT((ndo, "invalid len")); 1534 break; 1535 } 1536 while (tlen>0) { 1537 ND_TCHECK2(tptr[0], 4); 1538 ND_PRINT((ndo, "%s%s", 1539 ipaddr_string(ndo, tptr), 1540 (tlen>4) ? ", " : "")); 1541 tlen -=4; 1542 tptr +=4; 1543 } 1544 break; 1545 case BGPTYPE_MP_REACH_NLRI: 1546 ND_TCHECK2(tptr[0], 3); 1547 af = EXTRACT_16BITS(tptr); 1548 safi = tptr[2]; 1549 1550 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1551 tok2str(af_values, "Unknown AFI", af), 1552 af, 1553 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1554 tok2str(bgp_safi_values, "Unknown SAFI", safi), 1555 safi)); 1556 1557 switch(af<<8 | safi) { 1558 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1559 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1560 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1561 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1562 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1563 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1564 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1565 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1566 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1567 case (AFNUM_INET<<8 | SAFNUM_MDT): 1568 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1569 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1570 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1571 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1572 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1573 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1574 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1575 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1576 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1577 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1578 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1579 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1580 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1581 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1582 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1583 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1584 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1585 break; 1586 default: 1587 ND_TCHECK2(tptr[0], tlen); 1588 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1589 if (ndo->ndo_vflag <= 1) 1590 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1591 goto done; 1592 break; 1593 } 1594 1595 tptr +=3; 1596 1597 ND_TCHECK(tptr[0]); 1598 nhlen = tptr[0]; 1599 tlen = nhlen; 1600 tptr++; 1601 1602 if (tlen) { 1603 int nnh = 0; 1604 ND_PRINT((ndo, "\n\t nexthop: ")); 1605 while (tlen > 0) { 1606 if ( nnh++ > 0 ) { 1607 ND_PRINT((ndo, ", " )); 1608 } 1609 switch(af<<8 | safi) { 1610 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1611 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1612 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1613 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1614 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1615 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1616 case (AFNUM_INET<<8 | SAFNUM_MDT): 1617 if (tlen < (int)sizeof(struct in_addr)) { 1618 ND_PRINT((ndo, "invalid len")); 1619 tlen = 0; 1620 } else { 1621 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1622 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr))); 1623 tlen -= sizeof(struct in_addr); 1624 tptr += sizeof(struct in_addr); 1625 } 1626 break; 1627 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1628 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1629 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1630 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { 1631 ND_PRINT((ndo, "invalid len")); 1632 tlen = 0; 1633 } else { 1634 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1635 ND_PRINT((ndo, "RD: %s, %s", 1636 bgp_vpn_rd_print(ndo, tptr), 1637 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN))); 1638 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1639 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1640 } 1641 break; 1642 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1643 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1644 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1645 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1646 if (tlen < (int)sizeof(struct in6_addr)) { 1647 ND_PRINT((ndo, "invalid len")); 1648 tlen = 0; 1649 } else { 1650 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)); 1651 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr))); 1652 tlen -= sizeof(struct in6_addr); 1653 tptr += sizeof(struct in6_addr); 1654 } 1655 break; 1656 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1657 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1658 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1659 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { 1660 ND_PRINT((ndo, "invalid len")); 1661 tlen = 0; 1662 } else { 1663 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1664 ND_PRINT((ndo, "RD: %s, %s", 1665 bgp_vpn_rd_print(ndo, tptr), 1666 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN))); 1667 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1668 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1669 } 1670 break; 1671 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1672 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1673 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1674 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1675 if (tlen < (int)sizeof(struct in_addr)) { 1676 ND_PRINT((ndo, "invalid len")); 1677 tlen = 0; 1678 } else { 1679 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1680 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr))); 1681 tlen -= (sizeof(struct in_addr)); 1682 tptr += (sizeof(struct in_addr)); 1683 } 1684 break; 1685 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1686 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1687 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1688 ND_TCHECK2(tptr[0], tlen); 1689 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen))); 1690 tptr += tlen; 1691 tlen = 0; 1692 break; 1693 1694 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1695 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1696 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1697 if (tlen < BGP_VPN_RD_LEN+1) { 1698 ND_PRINT((ndo, "invalid len")); 1699 tlen = 0; 1700 } else { 1701 ND_TCHECK2(tptr[0], tlen); 1702 ND_PRINT((ndo, "RD: %s, %s", 1703 bgp_vpn_rd_print(ndo, tptr), 1704 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN))); 1705 /* rfc986 mapped IPv4 address ? */ 1706 if (EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601) 1707 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4))); 1708 /* rfc1888 mapped IPv6 address ? */ 1709 else if (EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000) 1710 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3))); 1711 tptr += tlen; 1712 tlen = 0; 1713 } 1714 break; 1715 default: 1716 ND_TCHECK2(tptr[0], tlen); 1717 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi)); 1718 if (ndo->ndo_vflag <= 1) 1719 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1720 tptr += tlen; 1721 tlen = 0; 1722 goto done; 1723 break; 1724 } 1725 } 1726 } 1727 ND_PRINT((ndo, ", nh-length: %u", nhlen)); 1728 tptr += tlen; 1729 1730 ND_TCHECK(tptr[0]); 1731 snpa = tptr[0]; 1732 tptr++; 1733 1734 if (snpa) { 1735 ND_PRINT((ndo, "\n\t %u SNPA", snpa)); 1736 for (/*nothing*/; snpa > 0; snpa--) { 1737 ND_TCHECK(tptr[0]); 1738 ND_PRINT((ndo, "\n\t %d bytes", tptr[0])); 1739 tptr += tptr[0] + 1; 1740 } 1741 } else { 1742 ND_PRINT((ndo, ", no SNPA")); 1743 } 1744 1745 while (tptr < pptr + len) { 1746 switch (af<<8 | safi) { 1747 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1748 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1749 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1750 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1751 if (advance == -1) 1752 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1753 else if (advance == -2) 1754 goto trunc; 1755 else if (advance == -3) 1756 break; /* bytes left, but not enough */ 1757 else 1758 ND_PRINT((ndo, "\n\t %s", buf)); 1759 break; 1760 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1761 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1762 if (advance == -1) 1763 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1764 else if (advance == -2) 1765 goto trunc; 1766 else if (advance == -3) 1767 break; /* bytes left, but not enough */ 1768 else 1769 ND_PRINT((ndo, "\n\t %s", buf)); 1770 break; 1771 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1772 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1773 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1774 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1775 if (advance == -1) 1776 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1777 else if (advance == -2) 1778 goto trunc; 1779 else 1780 ND_PRINT((ndo, "\n\t %s", buf)); 1781 break; 1782 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1783 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf)); 1784 if (advance == -1) 1785 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1786 else if (advance == -2) 1787 goto trunc; 1788 else 1789 ND_PRINT((ndo, "\n\t %s", buf)); 1790 break; 1791 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1792 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1793 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 1794 if (advance == -1) 1795 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1796 else if (advance == -2) 1797 goto trunc; 1798 else 1799 ND_PRINT((ndo, "\n\t %s", buf)); 1800 break; 1801 1802 case (AFNUM_INET<<8 | SAFNUM_MDT): 1803 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 1804 if (advance == -1) 1805 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1806 else if (advance == -2) 1807 goto trunc; 1808 else 1809 ND_PRINT((ndo, "\n\t %s", buf)); 1810 break; 1811 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1812 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1813 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1814 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1815 if (advance == -1) 1816 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1817 else if (advance == -2) 1818 goto trunc; 1819 else if (advance == -3) 1820 break; /* bytes left, but not enough */ 1821 else 1822 ND_PRINT((ndo, "\n\t %s", buf)); 1823 break; 1824 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1825 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1826 if (advance == -1) 1827 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1828 else if (advance == -2) 1829 goto trunc; 1830 else if (advance == -3) 1831 break; /* bytes left, but not enough */ 1832 else 1833 ND_PRINT((ndo, "\n\t %s", buf)); 1834 break; 1835 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1836 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1837 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1838 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1839 if (advance == -1) 1840 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1841 else if (advance == -2) 1842 goto trunc; 1843 else 1844 ND_PRINT((ndo, "\n\t %s", buf)); 1845 break; 1846 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1847 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1848 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1849 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1850 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1851 if (advance == -1) 1852 ND_PRINT((ndo, "\n\t (illegal length)")); 1853 else if (advance == -2) 1854 goto trunc; 1855 else 1856 ND_PRINT((ndo, "\n\t %s", buf)); 1857 break; 1858 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1859 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1860 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1861 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1862 if (advance == -1) 1863 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1864 else if (advance == -2) 1865 goto trunc; 1866 else 1867 ND_PRINT((ndo, "\n\t %s", buf)); 1868 break; 1869 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1870 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1871 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1872 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1873 if (advance == -1) 1874 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1875 else if (advance == -2) 1876 goto trunc; 1877 else 1878 ND_PRINT((ndo, "\n\t %s", buf)); 1879 break; 1880 default: 1881 ND_TCHECK2(*tptr,tlen); 1882 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1883 if (ndo->ndo_vflag <= 1) 1884 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1885 advance = 0; 1886 tptr = pptr + len; 1887 break; 1888 } 1889 if (advance < 0) 1890 break; 1891 tptr += advance; 1892 } 1893 done: 1894 break; 1895 1896 case BGPTYPE_MP_UNREACH_NLRI: 1897 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE); 1898 af = EXTRACT_16BITS(tptr); 1899 safi = tptr[2]; 1900 1901 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1902 tok2str(af_values, "Unknown AFI", af), 1903 af, 1904 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1905 tok2str(bgp_safi_values, "Unknown SAFI", safi), 1906 safi)); 1907 1908 if (len == BGP_MP_NLRI_MINSIZE) 1909 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 1910 1911 tptr += 3; 1912 1913 while (tptr < pptr + len) { 1914 switch (af<<8 | safi) { 1915 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1916 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1917 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1918 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1919 if (advance == -1) 1920 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1921 else if (advance == -2) 1922 goto trunc; 1923 else if (advance == -3) 1924 break; /* bytes left, but not enough */ 1925 else 1926 ND_PRINT((ndo, "\n\t %s", buf)); 1927 break; 1928 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1929 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1930 if (advance == -1) 1931 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1932 else if (advance == -2) 1933 goto trunc; 1934 else if (advance == -3) 1935 break; /* bytes left, but not enough */ 1936 else 1937 ND_PRINT((ndo, "\n\t %s", buf)); 1938 break; 1939 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1940 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1941 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1942 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1943 if (advance == -1) 1944 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1945 else if (advance == -2) 1946 goto trunc; 1947 else 1948 ND_PRINT((ndo, "\n\t %s", buf)); 1949 break; 1950 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1951 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1952 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1953 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1954 if (advance == -1) 1955 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1956 else if (advance == -2) 1957 goto trunc; 1958 else if (advance == -3) 1959 break; /* bytes left, but not enough */ 1960 else 1961 ND_PRINT((ndo, "\n\t %s", buf)); 1962 break; 1963 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1964 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1965 if (advance == -1) 1966 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1967 else if (advance == -2) 1968 goto trunc; 1969 else if (advance == -3) 1970 break; /* bytes left, but not enough */ 1971 else 1972 ND_PRINT((ndo, "\n\t %s", buf)); 1973 break; 1974 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1975 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1976 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1977 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf)); 1978 if (advance == -1) 1979 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1980 else if (advance == -2) 1981 goto trunc; 1982 else 1983 ND_PRINT((ndo, "\n\t %s", buf)); 1984 break; 1985 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1986 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1987 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1988 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1989 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1990 if (advance == -1) 1991 ND_PRINT((ndo, "\n\t (illegal length)")); 1992 else if (advance == -2) 1993 goto trunc; 1994 else 1995 ND_PRINT((ndo, "\n\t %s", buf)); 1996 break; 1997 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1998 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1999 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 2000 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 2001 if (advance == -1) 2002 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2003 else if (advance == -2) 2004 goto trunc; 2005 else 2006 ND_PRINT((ndo, "\n\t %s", buf)); 2007 break; 2008 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 2009 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 2010 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 2011 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 2012 if (advance == -1) 2013 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2014 else if (advance == -2) 2015 goto trunc; 2016 else 2017 ND_PRINT((ndo, "\n\t %s", buf)); 2018 break; 2019 case (AFNUM_INET<<8 | SAFNUM_MDT): 2020 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 2021 if (advance == -1) 2022 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2023 else if (advance == -2) 2024 goto trunc; 2025 else 2026 ND_PRINT((ndo, "\n\t %s", buf)); 2027 break; 2028 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 2029 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 2030 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 2031 if (advance == -1) 2032 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2033 else if (advance == -2) 2034 goto trunc; 2035 else 2036 ND_PRINT((ndo, "\n\t %s", buf)); 2037 break; 2038 default: 2039 ND_TCHECK2(*(tptr-3),tlen); 2040 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi)); 2041 if (ndo->ndo_vflag <= 1) 2042 print_unknown_data(ndo, tptr-3, "\n\t ", tlen); 2043 advance = 0; 2044 tptr = pptr + len; 2045 break; 2046 } 2047 if (advance < 0) 2048 break; 2049 tptr += advance; 2050 } 2051 break; 2052 case BGPTYPE_EXTD_COMMUNITIES: 2053 if (len % 8) { 2054 ND_PRINT((ndo, "invalid len")); 2055 break; 2056 } 2057 while (tlen>0) { 2058 uint16_t extd_comm; 2059 2060 ND_TCHECK2(tptr[0], 2); 2061 extd_comm=EXTRACT_16BITS(tptr); 2062 2063 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]", 2064 tok2str(bgp_extd_comm_subtype_values, 2065 "unknown extd community typecode", 2066 extd_comm), 2067 extd_comm, 2068 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm))); 2069 2070 ND_TCHECK2(*(tptr+2), 6); 2071 switch(extd_comm) { 2072 case BGP_EXT_COM_RT_0: 2073 case BGP_EXT_COM_RO_0: 2074 case BGP_EXT_COM_L2VPN_RT_0: 2075 ND_PRINT((ndo, ": %u:%u (= %s)", 2076 EXTRACT_16BITS(tptr+2), 2077 EXTRACT_32BITS(tptr+4), 2078 ipaddr_string(ndo, tptr+4))); 2079 break; 2080 case BGP_EXT_COM_RT_1: 2081 case BGP_EXT_COM_RO_1: 2082 case BGP_EXT_COM_L2VPN_RT_1: 2083 case BGP_EXT_COM_VRF_RT_IMP: 2084 ND_PRINT((ndo, ": %s:%u", 2085 ipaddr_string(ndo, tptr+2), 2086 EXTRACT_16BITS(tptr+6))); 2087 break; 2088 case BGP_EXT_COM_RT_2: 2089 case BGP_EXT_COM_RO_2: 2090 ND_PRINT((ndo, ": %s:%u", 2091 as_printf(ndo, astostr, sizeof(astostr), 2092 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6))); 2093 break; 2094 case BGP_EXT_COM_LINKBAND: 2095 bw.i = EXTRACT_32BITS(tptr+2); 2096 ND_PRINT((ndo, ": bandwidth: %.3f Mbps", 2097 bw.f*8/1000000)); 2098 break; 2099 case BGP_EXT_COM_VPN_ORIGIN: 2100 case BGP_EXT_COM_VPN_ORIGIN2: 2101 case BGP_EXT_COM_VPN_ORIGIN3: 2102 case BGP_EXT_COM_VPN_ORIGIN4: 2103 case BGP_EXT_COM_OSPF_RID: 2104 case BGP_EXT_COM_OSPF_RID2: 2105 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2))); 2106 break; 2107 case BGP_EXT_COM_OSPF_RTYPE: 2108 case BGP_EXT_COM_OSPF_RTYPE2: 2109 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s", 2110 ipaddr_string(ndo, tptr+2), 2111 tok2str(bgp_extd_comm_ospf_rtype_values, 2112 "unknown (0x%02x)", 2113 *(tptr+6)), 2114 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", 2115 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "")); 2116 break; 2117 case BGP_EXT_COM_L2INFO: 2118 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u", 2119 tok2str(l2vpn_encaps_values, 2120 "unknown encaps", 2121 *(tptr+2)), 2122 *(tptr+3), 2123 EXTRACT_16BITS(tptr+4))); 2124 break; 2125 case BGP_EXT_COM_SOURCE_AS: 2126 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2))); 2127 break; 2128 default: 2129 ND_TCHECK2(*tptr,8); 2130 print_unknown_data(ndo, tptr, "\n\t ", 8); 2131 break; 2132 } 2133 tlen -=8; 2134 tptr +=8; 2135 } 2136 break; 2137 2138 case BGPTYPE_PMSI_TUNNEL: 2139 { 2140 uint8_t tunnel_type, flags; 2141 2142 ND_TCHECK2(tptr[0], 5); 2143 tunnel_type = *(tptr+1); 2144 flags = *tptr; 2145 tlen = len; 2146 2147 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", 2148 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), 2149 tunnel_type, 2150 bittok2str(bgp_pmsi_flag_values, "none", flags), 2151 EXTRACT_24BITS(tptr+2)>>4)); 2152 2153 tptr +=5; 2154 tlen -= 5; 2155 2156 switch (tunnel_type) { 2157 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ 2158 case BGP_PMSI_TUNNEL_PIM_BIDIR: 2159 ND_TCHECK2(tptr[0], 8); 2160 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s", 2161 ipaddr_string(ndo, tptr), 2162 ipaddr_string(ndo, tptr+4))); 2163 break; 2164 2165 case BGP_PMSI_TUNNEL_PIM_SSM: 2166 ND_TCHECK2(tptr[0], 8); 2167 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s", 2168 ipaddr_string(ndo, tptr), 2169 ipaddr_string(ndo, tptr+4))); 2170 break; 2171 case BGP_PMSI_TUNNEL_INGRESS: 2172 ND_TCHECK2(tptr[0], 4); 2173 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s", 2174 ipaddr_string(ndo, tptr))); 2175 break; 2176 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ 2177 case BGP_PMSI_TUNNEL_LDP_MP2MP: 2178 ND_TCHECK2(tptr[0], 8); 2179 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x", 2180 ipaddr_string(ndo, tptr), 2181 EXTRACT_32BITS(tptr+4))); 2182 break; 2183 case BGP_PMSI_TUNNEL_RSVP_P2MP: 2184 ND_TCHECK2(tptr[0], 8); 2185 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", 2186 ipaddr_string(ndo, tptr), 2187 EXTRACT_32BITS(tptr+4))); 2188 break; 2189 default: 2190 if (ndo->ndo_vflag <= 1) { 2191 print_unknown_data(ndo, tptr, "\n\t ", tlen); 2192 } 2193 } 2194 break; 2195 } 2196 case BGPTYPE_AIGP: 2197 { 2198 uint8_t type; 2199 uint16_t length; 2200 2201 tlen = len; 2202 2203 while (tlen >= 3) { 2204 2205 ND_TCHECK2(tptr[0], 3); 2206 2207 type = *tptr; 2208 length = EXTRACT_16BITS(tptr+1); 2209 tptr += 3; 2210 tlen -= 3; 2211 2212 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u", 2213 tok2str(bgp_aigp_values, "Unknown", type), 2214 type, length)); 2215 2216 if (length < 3) 2217 goto trunc; 2218 length -= 3; 2219 2220 /* 2221 * Check if we can read the TLV data. 2222 */ 2223 ND_TCHECK2(tptr[3], length); 2224 2225 switch (type) { 2226 2227 case BGP_AIGP_TLV: 2228 if (length < 8) 2229 goto trunc; 2230 ND_PRINT((ndo, ", metric %" PRIu64, 2231 EXTRACT_64BITS(tptr))); 2232 break; 2233 2234 default: 2235 if (ndo->ndo_vflag <= 1) { 2236 print_unknown_data(ndo, tptr,"\n\t ", length); 2237 } 2238 } 2239 2240 tptr += length; 2241 tlen -= length; 2242 } 2243 break; 2244 } 2245 case BGPTYPE_ATTR_SET: 2246 ND_TCHECK2(tptr[0], 4); 2247 if (len < 4) 2248 goto trunc; 2249 ND_PRINT((ndo, "\n\t Origin AS: %s", 2250 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)))); 2251 tptr+=4; 2252 len -=4; 2253 2254 while (len) { 2255 u_int aflags, alenlen, alen; 2256 2257 ND_TCHECK2(tptr[0], 2); 2258 if (len < 2) 2259 goto trunc; 2260 aflags = *tptr; 2261 atype = *(tptr + 1); 2262 tptr += 2; 2263 len -= 2; 2264 alenlen = bgp_attr_lenlen(aflags, tptr); 2265 ND_TCHECK2(tptr[0], alenlen); 2266 if (len < alenlen) 2267 goto trunc; 2268 alen = bgp_attr_len(aflags, tptr); 2269 tptr += alenlen; 2270 len -= alenlen; 2271 2272 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2273 tok2str(bgp_attr_values, 2274 "Unknown Attribute", atype), 2275 atype, 2276 alen)); 2277 2278 if (aflags) { 2279 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2280 aflags & 0x80 ? "O" : "", 2281 aflags & 0x40 ? "T" : "", 2282 aflags & 0x20 ? "P" : "", 2283 aflags & 0x10 ? "E" : "")); 2284 if (aflags & 0xf) 2285 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2286 ND_PRINT((ndo, "]: ")); 2287 } 2288 /* FIXME check for recursion */ 2289 if (!bgp_attr_print(ndo, atype, tptr, alen)) 2290 return 0; 2291 tptr += alen; 2292 len -= alen; 2293 } 2294 break; 2295 2296 case BGPTYPE_LARGE_COMMUNITY: 2297 if (len == 0 || len % 12) { 2298 ND_PRINT((ndo, "invalid len")); 2299 break; 2300 } 2301 ND_PRINT((ndo, "\n\t ")); 2302 while (len > 0) { 2303 ND_TCHECK2(*tptr, 12); 2304 ND_PRINT((ndo, "%u:%u:%u%s", 2305 EXTRACT_32BITS(tptr), 2306 EXTRACT_32BITS(tptr + 4), 2307 EXTRACT_32BITS(tptr + 8), 2308 (len > 12) ? ", " : "")); 2309 tptr += 12; 2310 len -= 12; 2311 } 2312 break; 2313 default: 2314 ND_TCHECK2(*pptr,len); 2315 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */ 2316 if (ndo->ndo_vflag <= 1) 2317 print_unknown_data(ndo, pptr, "\n\t ", len); 2318 break; 2319 } 2320 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/ 2321 ND_TCHECK2(*pptr,len); 2322 print_unknown_data(ndo, pptr, "\n\t ", len); 2323 } 2324 return 1; 2325 2326 trunc: 2327 return 0; 2328 } 2329 2330 static void 2331 bgp_capabilities_print(netdissect_options *ndo, 2332 const u_char *opt, int caps_len) 2333 { 2334 int cap_type, cap_len, tcap_len, cap_offset; 2335 int i = 0; 2336 2337 while (i < caps_len) { 2338 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE); 2339 cap_type=opt[i]; 2340 cap_len=opt[i+1]; 2341 tcap_len=cap_len; 2342 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2343 tok2str(bgp_capcode_values, "Unknown", 2344 cap_type), 2345 cap_type, 2346 cap_len)); 2347 ND_TCHECK2(opt[i+2], cap_len); 2348 switch (cap_type) { 2349 case BGP_CAPCODE_MP: 2350 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)", 2351 tok2str(af_values, "Unknown", 2352 EXTRACT_16BITS(opt+i+2)), 2353 EXTRACT_16BITS(opt+i+2), 2354 tok2str(bgp_safi_values, "Unknown", 2355 opt[i+5]), 2356 opt[i+5])); 2357 break; 2358 case BGP_CAPCODE_RESTART: 2359 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us", 2360 ((opt[i+2])&0x80) ? "R" : "none", 2361 EXTRACT_16BITS(opt+i+2)&0xfff)); 2362 tcap_len-=2; 2363 cap_offset=4; 2364 while(tcap_len>=4) { 2365 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", 2366 tok2str(af_values,"Unknown", 2367 EXTRACT_16BITS(opt+i+cap_offset)), 2368 EXTRACT_16BITS(opt+i+cap_offset), 2369 tok2str(bgp_safi_values,"Unknown", 2370 opt[i+cap_offset+2]), 2371 opt[i+cap_offset+2], 2372 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" )); 2373 tcap_len-=4; 2374 cap_offset+=4; 2375 } 2376 break; 2377 case BGP_CAPCODE_RR: 2378 case BGP_CAPCODE_RR_CISCO: 2379 break; 2380 case BGP_CAPCODE_AS_NEW: 2381 2382 /* 2383 * Extract the 4 byte AS number encoded. 2384 */ 2385 if (cap_len == 4) { 2386 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s", 2387 as_printf(ndo, astostr, sizeof(astostr), 2388 EXTRACT_32BITS(opt + i + 2)))); 2389 } 2390 break; 2391 case BGP_CAPCODE_ADD_PATH: 2392 cap_offset=2; 2393 if (tcap_len == 0) { 2394 ND_PRINT((ndo, " (bogus)")); /* length */ 2395 break; 2396 } 2397 while (tcap_len > 0) { 2398 if (tcap_len < 4) { 2399 ND_PRINT((ndo, "\n\t\t(invalid)")); 2400 break; 2401 } 2402 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s", 2403 tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)), 2404 EXTRACT_16BITS(opt+i+cap_offset), 2405 tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]), 2406 opt[i+cap_offset+2], 2407 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3]) 2408 )); 2409 tcap_len-=4; 2410 cap_offset+=4; 2411 } 2412 break; 2413 default: 2414 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u", 2415 cap_type)); 2416 if (ndo->ndo_vflag <= 1) 2417 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2418 break; 2419 } 2420 if (ndo->ndo_vflag > 1 && cap_len > 0) { 2421 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2422 } 2423 i += BGP_CAP_HEADER_SIZE + cap_len; 2424 } 2425 return; 2426 2427 trunc: 2428 ND_PRINT((ndo, "[|BGP]")); 2429 } 2430 2431 static void 2432 bgp_open_print(netdissect_options *ndo, 2433 const u_char *dat, int length) 2434 { 2435 struct bgp_open bgpo; 2436 struct bgp_opt bgpopt; 2437 const u_char *opt; 2438 int i; 2439 2440 ND_TCHECK2(dat[0], BGP_OPEN_SIZE); 2441 memcpy(&bgpo, dat, BGP_OPEN_SIZE); 2442 2443 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version)); 2444 ND_PRINT((ndo, "my AS %s, ", 2445 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas)))); 2446 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime))); 2447 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id))); 2448 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen)); 2449 2450 /* some little sanity checking */ 2451 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) 2452 return; 2453 2454 /* ugly! */ 2455 opt = &((const struct bgp_open *)dat)->bgpo_optlen; 2456 opt++; 2457 2458 i = 0; 2459 while (i < bgpo.bgpo_optlen) { 2460 ND_TCHECK2(opt[i], BGP_OPT_SIZE); 2461 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); 2462 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { 2463 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len)); 2464 break; 2465 } 2466 2467 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u", 2468 tok2str(bgp_opt_values,"Unknown", 2469 bgpopt.bgpopt_type), 2470 bgpopt.bgpopt_type, 2471 bgpopt.bgpopt_len)); 2472 2473 /* now let's decode the options we know*/ 2474 switch(bgpopt.bgpopt_type) { 2475 2476 case BGP_OPT_CAP: 2477 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE], 2478 bgpopt.bgpopt_len); 2479 break; 2480 2481 case BGP_OPT_AUTH: 2482 default: 2483 ND_PRINT((ndo, "\n\t no decoder for option %u", 2484 bgpopt.bgpopt_type)); 2485 break; 2486 } 2487 i += BGP_OPT_SIZE + bgpopt.bgpopt_len; 2488 } 2489 return; 2490 trunc: 2491 ND_PRINT((ndo, "[|BGP]")); 2492 } 2493 2494 static void 2495 bgp_update_print(netdissect_options *ndo, 2496 const u_char *dat, int length) 2497 { 2498 struct bgp bgp; 2499 const u_char *p; 2500 int withdrawn_routes_len; 2501 int len; 2502 int i; 2503 2504 ND_TCHECK2(dat[0], BGP_SIZE); 2505 if (length < BGP_SIZE) 2506 goto trunc; 2507 memcpy(&bgp, dat, BGP_SIZE); 2508 p = dat + BGP_SIZE; /*XXX*/ 2509 length -= BGP_SIZE; 2510 2511 /* Unfeasible routes */ 2512 ND_TCHECK2(p[0], 2); 2513 if (length < 2) 2514 goto trunc; 2515 withdrawn_routes_len = EXTRACT_16BITS(p); 2516 p += 2; 2517 length -= 2; 2518 if (withdrawn_routes_len) { 2519 /* 2520 * Without keeping state from the original NLRI message, 2521 * it's not possible to tell if this a v4 or v6 route, 2522 * so only try to decode it if we're not v6 enabled. 2523 */ 2524 ND_TCHECK2(p[0], withdrawn_routes_len); 2525 if (length < withdrawn_routes_len) 2526 goto trunc; 2527 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len)); 2528 p += withdrawn_routes_len; 2529 length -= withdrawn_routes_len; 2530 } 2531 2532 ND_TCHECK2(p[0], 2); 2533 if (length < 2) 2534 goto trunc; 2535 len = EXTRACT_16BITS(p); 2536 p += 2; 2537 length -= 2; 2538 2539 if (withdrawn_routes_len == 0 && len == 0 && length == 0) { 2540 /* No withdrawn routes, no path attributes, no NLRI */ 2541 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 2542 return; 2543 } 2544 2545 if (len) { 2546 /* do something more useful!*/ 2547 while (len) { 2548 int aflags, atype, alenlen, alen; 2549 2550 ND_TCHECK2(p[0], 2); 2551 if (len < 2) 2552 goto trunc; 2553 if (length < 2) 2554 goto trunc; 2555 aflags = *p; 2556 atype = *(p + 1); 2557 p += 2; 2558 len -= 2; 2559 length -= 2; 2560 alenlen = bgp_attr_lenlen(aflags, p); 2561 ND_TCHECK2(p[0], alenlen); 2562 if (len < alenlen) 2563 goto trunc; 2564 if (length < alenlen) 2565 goto trunc; 2566 alen = bgp_attr_len(aflags, p); 2567 p += alenlen; 2568 len -= alenlen; 2569 length -= alenlen; 2570 2571 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2572 tok2str(bgp_attr_values, "Unknown Attribute", 2573 atype), 2574 atype, 2575 alen)); 2576 2577 if (aflags) { 2578 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2579 aflags & 0x80 ? "O" : "", 2580 aflags & 0x40 ? "T" : "", 2581 aflags & 0x20 ? "P" : "", 2582 aflags & 0x10 ? "E" : "")); 2583 if (aflags & 0xf) 2584 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2585 ND_PRINT((ndo, "]: ")); 2586 } 2587 if (len < alen) 2588 goto trunc; 2589 if (length < alen) 2590 goto trunc; 2591 if (!bgp_attr_print(ndo, atype, p, alen)) 2592 goto trunc; 2593 p += alen; 2594 len -= alen; 2595 length -= alen; 2596 } 2597 } 2598 2599 if (length) { 2600 /* 2601 * XXX - what if they're using the "Advertisement of 2602 * Multiple Paths in BGP" feature: 2603 * 2604 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/ 2605 * 2606 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06 2607 */ 2608 ND_PRINT((ndo, "\n\t Updated routes:")); 2609 while (length) { 2610 char buf[MAXHOSTNAMELEN + 100]; 2611 i = decode_prefix4(ndo, p, length, buf, sizeof(buf)); 2612 if (i == -1) { 2613 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2614 break; 2615 } else if (i == -2) 2616 goto trunc; 2617 else if (i == -3) 2618 goto trunc; /* bytes left, but not enough */ 2619 else { 2620 ND_PRINT((ndo, "\n\t %s", buf)); 2621 p += i; 2622 length -= i; 2623 } 2624 } 2625 } 2626 return; 2627 trunc: 2628 ND_PRINT((ndo, "[|BGP]")); 2629 } 2630 2631 static void 2632 bgp_notification_print(netdissect_options *ndo, 2633 const u_char *dat, int length) 2634 { 2635 struct bgp_notification bgpn; 2636 const u_char *tptr; 2637 2638 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); 2639 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); 2640 2641 /* some little sanity checking */ 2642 if (length<BGP_NOTIFICATION_SIZE) 2643 return; 2644 2645 ND_PRINT((ndo, ", %s (%u)", 2646 tok2str(bgp_notify_major_values, "Unknown Error", 2647 bgpn.bgpn_major), 2648 bgpn.bgpn_major)); 2649 2650 switch (bgpn.bgpn_major) { 2651 2652 case BGP_NOTIFY_MAJOR_MSG: 2653 ND_PRINT((ndo, ", subcode %s (%u)", 2654 tok2str(bgp_notify_minor_msg_values, "Unknown", 2655 bgpn.bgpn_minor), 2656 bgpn.bgpn_minor)); 2657 break; 2658 case BGP_NOTIFY_MAJOR_OPEN: 2659 ND_PRINT((ndo, ", subcode %s (%u)", 2660 tok2str(bgp_notify_minor_open_values, "Unknown", 2661 bgpn.bgpn_minor), 2662 bgpn.bgpn_minor)); 2663 break; 2664 case BGP_NOTIFY_MAJOR_UPDATE: 2665 ND_PRINT((ndo, ", subcode %s (%u)", 2666 tok2str(bgp_notify_minor_update_values, "Unknown", 2667 bgpn.bgpn_minor), 2668 bgpn.bgpn_minor)); 2669 break; 2670 case BGP_NOTIFY_MAJOR_FSM: 2671 ND_PRINT((ndo, " subcode %s (%u)", 2672 tok2str(bgp_notify_minor_fsm_values, "Unknown", 2673 bgpn.bgpn_minor), 2674 bgpn.bgpn_minor)); 2675 break; 2676 case BGP_NOTIFY_MAJOR_CAP: 2677 ND_PRINT((ndo, " subcode %s (%u)", 2678 tok2str(bgp_notify_minor_cap_values, "Unknown", 2679 bgpn.bgpn_minor), 2680 bgpn.bgpn_minor)); 2681 break; 2682 case BGP_NOTIFY_MAJOR_CEASE: 2683 ND_PRINT((ndo, ", subcode %s (%u)", 2684 tok2str(bgp_notify_minor_cease_values, "Unknown", 2685 bgpn.bgpn_minor), 2686 bgpn.bgpn_minor)); 2687 2688 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes 2689 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES 2690 */ 2691 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { 2692 tptr = dat + BGP_NOTIFICATION_SIZE; 2693 ND_TCHECK2(*tptr, 7); 2694 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", 2695 tok2str(af_values, "Unknown", 2696 EXTRACT_16BITS(tptr)), 2697 EXTRACT_16BITS(tptr), 2698 tok2str(bgp_safi_values, "Unknown", *(tptr+2)), 2699 *(tptr+2), 2700 EXTRACT_32BITS(tptr+3))); 2701 } 2702 break; 2703 default: 2704 break; 2705 } 2706 2707 return; 2708 trunc: 2709 ND_PRINT((ndo, "[|BGP]")); 2710 } 2711 2712 static void 2713 bgp_route_refresh_print(netdissect_options *ndo, 2714 const u_char *pptr, int len) 2715 { 2716 const struct bgp_route_refresh *bgp_route_refresh_header; 2717 2718 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE); 2719 2720 /* some little sanity checking */ 2721 if (len<BGP_ROUTE_REFRESH_SIZE) 2722 return; 2723 2724 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; 2725 2726 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)", 2727 tok2str(af_values,"Unknown", 2728 /* this stinks but the compiler pads the structure 2729 * weird */ 2730 EXTRACT_16BITS(&bgp_route_refresh_header->afi)), 2731 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2732 tok2str(bgp_safi_values,"Unknown", 2733 bgp_route_refresh_header->safi), 2734 bgp_route_refresh_header->safi)); 2735 2736 if (ndo->ndo_vflag > 1) { 2737 ND_TCHECK2(*pptr, len); 2738 print_unknown_data(ndo, pptr, "\n\t ", len); 2739 } 2740 2741 return; 2742 trunc: 2743 ND_PRINT((ndo, "[|BGP]")); 2744 } 2745 2746 static int 2747 bgp_header_print(netdissect_options *ndo, 2748 const u_char *dat, int length) 2749 { 2750 struct bgp bgp; 2751 2752 ND_TCHECK2(dat[0], BGP_SIZE); 2753 memcpy(&bgp, dat, BGP_SIZE); 2754 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u", 2755 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type), 2756 bgp.bgp_type, 2757 length)); 2758 2759 switch (bgp.bgp_type) { 2760 case BGP_OPEN: 2761 bgp_open_print(ndo, dat, length); 2762 break; 2763 case BGP_UPDATE: 2764 bgp_update_print(ndo, dat, length); 2765 break; 2766 case BGP_NOTIFICATION: 2767 bgp_notification_print(ndo, dat, length); 2768 break; 2769 case BGP_KEEPALIVE: 2770 break; 2771 case BGP_ROUTE_REFRESH: 2772 bgp_route_refresh_print(ndo, dat, length); 2773 break; 2774 default: 2775 /* we have no decoder for the BGP message */ 2776 ND_TCHECK2(*dat, length); 2777 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type)); 2778 print_unknown_data(ndo, dat, "\n\t ", length); 2779 break; 2780 } 2781 return 1; 2782 trunc: 2783 ND_PRINT((ndo, "[|BGP]")); 2784 return 0; 2785 } 2786 2787 void 2788 bgp_print(netdissect_options *ndo, 2789 const u_char *dat, int length) 2790 { 2791 const u_char *p; 2792 const u_char *ep; 2793 const u_char *start; 2794 const u_char marker[] = { 2795 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2796 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2797 }; 2798 struct bgp bgp; 2799 uint16_t hlen; 2800 2801 ep = dat + length; 2802 if (ndo->ndo_snapend < dat + length) 2803 ep = ndo->ndo_snapend; 2804 2805 ND_PRINT((ndo, ": BGP")); 2806 2807 if (ndo->ndo_vflag < 1) /* lets be less chatty */ 2808 return; 2809 2810 p = dat; 2811 start = p; 2812 while (p < ep) { 2813 if (!ND_TTEST2(p[0], 1)) 2814 break; 2815 if (p[0] != 0xff) { 2816 p++; 2817 continue; 2818 } 2819 2820 if (!ND_TTEST2(p[0], sizeof(marker))) 2821 break; 2822 if (memcmp(p, marker, sizeof(marker)) != 0) { 2823 p++; 2824 continue; 2825 } 2826 2827 /* found BGP header */ 2828 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/ 2829 memcpy(&bgp, p, BGP_SIZE); 2830 2831 if (start != p) 2832 ND_PRINT((ndo, " [|BGP]")); 2833 2834 hlen = ntohs(bgp.bgp_len); 2835 if (hlen < BGP_SIZE) { 2836 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen, 2837 BGP_SIZE)); 2838 break; 2839 } 2840 2841 if (ND_TTEST2(p[0], hlen)) { 2842 if (!bgp_header_print(ndo, p, hlen)) 2843 return; 2844 p += hlen; 2845 start = p; 2846 } else { 2847 ND_PRINT((ndo, "\n[|BGP %s]", 2848 tok2str(bgp_msg_values, 2849 "Unknown Message Type", 2850 bgp.bgp_type))); 2851 break; 2852 } 2853 } 2854 2855 return; 2856 2857 trunc: 2858 ND_PRINT((ndo, " [|BGP]")); 2859 } 2860 2861 /* 2862 * Local Variables: 2863 * c-style: whitesmith 2864 * c-basic-offset: 4 2865 * End: 2866 */ 2867