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 1.11 2020/02/24 18:39:47 kamil 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 static const char tstr[] = "[|BGP]"; 56 57 struct bgp { 58 uint8_t bgp_marker[16]; 59 uint16_t bgp_len; 60 uint8_t bgp_type; 61 }; 62 #define BGP_SIZE 19 /* unaligned */ 63 64 #define BGP_OPEN 1 65 #define BGP_UPDATE 2 66 #define BGP_NOTIFICATION 3 67 #define BGP_KEEPALIVE 4 68 #define BGP_ROUTE_REFRESH 5 69 70 static const struct tok bgp_msg_values[] = { 71 { BGP_OPEN, "Open"}, 72 { BGP_UPDATE, "Update"}, 73 { BGP_NOTIFICATION, "Notification"}, 74 { BGP_KEEPALIVE, "Keepalive"}, 75 { BGP_ROUTE_REFRESH, "Route Refresh"}, 76 { 0, NULL} 77 }; 78 79 struct bgp_open { 80 uint8_t bgpo_marker[16]; 81 uint16_t bgpo_len; 82 uint8_t bgpo_type; 83 uint8_t bgpo_version; 84 uint16_t bgpo_myas; 85 uint16_t bgpo_holdtime; 86 uint32_t bgpo_id; 87 uint8_t bgpo_optlen; 88 /* options should follow */ 89 }; 90 #define BGP_OPEN_SIZE 29 /* unaligned */ 91 92 struct bgp_opt { 93 uint8_t bgpopt_type; 94 uint8_t bgpopt_len; 95 /* variable length */ 96 }; 97 #define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */ 98 #define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */ 99 100 struct bgp_notification { 101 uint8_t bgpn_marker[16]; 102 uint16_t bgpn_len; 103 uint8_t bgpn_type; 104 uint8_t bgpn_major; 105 uint8_t bgpn_minor; 106 }; 107 #define BGP_NOTIFICATION_SIZE 21 /* unaligned */ 108 109 struct bgp_route_refresh { 110 uint8_t bgp_marker[16]; 111 uint16_t len; 112 uint8_t type; 113 uint8_t afi[2]; /* the compiler messes this structure up */ 114 uint8_t res; /* when doing misaligned sequences of int8 and int16 */ 115 uint8_t safi; /* afi should be int16 - so we have to access it using */ 116 }; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */ 117 #define BGP_ROUTE_REFRESH_SIZE 23 118 119 #define bgp_attr_lenlen(flags, p) \ 120 (((flags) & 0x10) ? 2 : 1) 121 #define bgp_attr_len(flags, p) \ 122 (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p)) 123 124 #define BGPTYPE_ORIGIN 1 125 #define BGPTYPE_AS_PATH 2 126 #define BGPTYPE_NEXT_HOP 3 127 #define BGPTYPE_MULTI_EXIT_DISC 4 128 #define BGPTYPE_LOCAL_PREF 5 129 #define BGPTYPE_ATOMIC_AGGREGATE 6 130 #define BGPTYPE_AGGREGATOR 7 131 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */ 132 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC4456 */ 133 #define BGPTYPE_CLUSTER_LIST 10 /* RFC4456 */ 134 #define BGPTYPE_DPA 11 /* deprecated, draft-ietf-idr-bgp-dpa */ 135 #define BGPTYPE_ADVERTISERS 12 /* deprecated RFC1863 */ 136 #define BGPTYPE_RCID_PATH 13 /* deprecated RFC1863 */ 137 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC4760 */ 138 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC4760 */ 139 #define BGPTYPE_EXTD_COMMUNITIES 16 /* RFC4360 */ 140 #define BGPTYPE_AS4_PATH 17 /* RFC6793 */ 141 #define BGPTYPE_AGGREGATOR4 18 /* RFC6793 */ 142 #define BGPTYPE_PMSI_TUNNEL 22 /* RFC6514 */ 143 #define BGPTYPE_TUNNEL_ENCAP 23 /* RFC5512 */ 144 #define BGPTYPE_TRAFFIC_ENG 24 /* RFC5543 */ 145 #define BGPTYPE_IPV6_EXTD_COMMUNITIES 25 /* RFC5701 */ 146 #define BGPTYPE_AIGP 26 /* RFC7311 */ 147 #define BGPTYPE_PE_DISTINGUISHER_LABEL 27 /* RFC6514 */ 148 #define BGPTYPE_ENTROPY_LABEL 28 /* RFC6790 */ 149 #define BGPTYPE_LARGE_COMMUNITY 32 /* draft-ietf-idr-large-community-05 */ 150 #define BGPTYPE_ATTR_SET 128 /* RFC6368 */ 151 152 #define BGP_MP_NLRI_MINSIZE 3 /* End of RIB Marker detection */ 153 154 static const struct tok bgp_attr_values[] = { 155 { BGPTYPE_ORIGIN, "Origin"}, 156 { BGPTYPE_AS_PATH, "AS Path"}, 157 { BGPTYPE_AS4_PATH, "AS4 Path"}, 158 { BGPTYPE_NEXT_HOP, "Next Hop"}, 159 { BGPTYPE_MULTI_EXIT_DISC, "Multi Exit Discriminator"}, 160 { BGPTYPE_LOCAL_PREF, "Local Preference"}, 161 { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"}, 162 { BGPTYPE_AGGREGATOR, "Aggregator"}, 163 { BGPTYPE_AGGREGATOR4, "Aggregator4"}, 164 { BGPTYPE_COMMUNITIES, "Community"}, 165 { BGPTYPE_ORIGINATOR_ID, "Originator ID"}, 166 { BGPTYPE_CLUSTER_LIST, "Cluster List"}, 167 { BGPTYPE_DPA, "DPA"}, 168 { BGPTYPE_ADVERTISERS, "Advertisers"}, 169 { BGPTYPE_RCID_PATH, "RCID Path / Cluster ID"}, 170 { BGPTYPE_MP_REACH_NLRI, "Multi-Protocol Reach NLRI"}, 171 { BGPTYPE_MP_UNREACH_NLRI, "Multi-Protocol Unreach NLRI"}, 172 { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"}, 173 { BGPTYPE_PMSI_TUNNEL, "PMSI Tunnel"}, 174 { BGPTYPE_TUNNEL_ENCAP, "Tunnel Encapsulation"}, 175 { BGPTYPE_TRAFFIC_ENG, "Traffic Engineering"}, 176 { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"}, 177 { BGPTYPE_AIGP, "Accumulated IGP Metric"}, 178 { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"}, 179 { BGPTYPE_ENTROPY_LABEL, "Entropy Label"}, 180 { BGPTYPE_LARGE_COMMUNITY, "Large Community"}, 181 { BGPTYPE_ATTR_SET, "Attribute Set"}, 182 { 255, "Reserved for development"}, 183 { 0, NULL} 184 }; 185 186 #define BGP_AS_SET 1 187 #define BGP_AS_SEQUENCE 2 188 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */ 189 #define BGP_CONFED_AS_SET 4 /* draft-ietf-idr-rfc3065bis-01 */ 190 191 #define BGP_AS_SEG_TYPE_MIN BGP_AS_SET 192 #define BGP_AS_SEG_TYPE_MAX BGP_CONFED_AS_SET 193 194 static const struct tok bgp_as_path_segment_open_values[] = { 195 { BGP_AS_SEQUENCE, ""}, 196 { BGP_AS_SET, "{ "}, 197 { BGP_CONFED_AS_SEQUENCE, "( "}, 198 { BGP_CONFED_AS_SET, "({ "}, 199 { 0, NULL} 200 }; 201 202 static const struct tok bgp_as_path_segment_close_values[] = { 203 { BGP_AS_SEQUENCE, ""}, 204 { BGP_AS_SET, "}"}, 205 { BGP_CONFED_AS_SEQUENCE, ")"}, 206 { BGP_CONFED_AS_SET, "})"}, 207 { 0, NULL} 208 }; 209 210 #define BGP_OPT_AUTH 1 211 #define BGP_OPT_CAP 2 212 213 static const struct tok bgp_opt_values[] = { 214 { BGP_OPT_AUTH, "Authentication Information"}, 215 { BGP_OPT_CAP, "Capabilities Advertisement"}, 216 { 0, NULL} 217 }; 218 219 #define BGP_CAPCODE_MP 1 /* RFC2858 */ 220 #define BGP_CAPCODE_RR 2 /* RFC2918 */ 221 #define BGP_CAPCODE_ORF 3 /* RFC5291 */ 222 #define BGP_CAPCODE_MR 4 /* RFC3107 */ 223 #define BGP_CAPCODE_EXT_NH 5 /* RFC5549 */ 224 #define BGP_CAPCODE_RESTART 64 /* RFC4724 */ 225 #define BGP_CAPCODE_AS_NEW 65 /* RFC6793 */ 226 #define BGP_CAPCODE_DYN_CAP 67 /* draft-ietf-idr-dynamic-cap */ 227 #define BGP_CAPCODE_MULTISESS 68 /* draft-ietf-idr-bgp-multisession */ 228 #define BGP_CAPCODE_ADD_PATH 69 /* RFC7911 */ 229 #define BGP_CAPCODE_ENH_RR 70 /* draft-keyur-bgp-enhanced-route-refresh */ 230 #define BGP_CAPCODE_RR_CISCO 128 231 232 static const struct tok bgp_capcode_values[] = { 233 { BGP_CAPCODE_MP, "Multiprotocol Extensions"}, 234 { BGP_CAPCODE_RR, "Route Refresh"}, 235 { BGP_CAPCODE_ORF, "Cooperative Route Filtering"}, 236 { BGP_CAPCODE_MR, "Multiple Routes to a Destination"}, 237 { BGP_CAPCODE_EXT_NH, "Extended Next Hop Encoding"}, 238 { BGP_CAPCODE_RESTART, "Graceful Restart"}, 239 { BGP_CAPCODE_AS_NEW, "32-Bit AS Number"}, 240 { BGP_CAPCODE_DYN_CAP, "Dynamic Capability"}, 241 { BGP_CAPCODE_MULTISESS, "Multisession BGP"}, 242 { BGP_CAPCODE_ADD_PATH, "Multiple Paths"}, 243 { BGP_CAPCODE_ENH_RR, "Enhanced Route Refresh"}, 244 { BGP_CAPCODE_RR_CISCO, "Route Refresh (Cisco)"}, 245 { 0, NULL} 246 }; 247 248 #define BGP_NOTIFY_MAJOR_MSG 1 249 #define BGP_NOTIFY_MAJOR_OPEN 2 250 #define BGP_NOTIFY_MAJOR_UPDATE 3 251 #define BGP_NOTIFY_MAJOR_HOLDTIME 4 252 #define BGP_NOTIFY_MAJOR_FSM 5 253 #define BGP_NOTIFY_MAJOR_CEASE 6 254 #define BGP_NOTIFY_MAJOR_CAP 7 255 256 static const struct tok bgp_notify_major_values[] = { 257 { BGP_NOTIFY_MAJOR_MSG, "Message Header Error"}, 258 { BGP_NOTIFY_MAJOR_OPEN, "OPEN Message Error"}, 259 { BGP_NOTIFY_MAJOR_UPDATE, "UPDATE Message Error"}, 260 { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"}, 261 { BGP_NOTIFY_MAJOR_FSM, "Finite State Machine Error"}, 262 { BGP_NOTIFY_MAJOR_CEASE, "Cease"}, 263 { BGP_NOTIFY_MAJOR_CAP, "Capability Message Error"}, 264 { 0, NULL} 265 }; 266 267 /* draft-ietf-idr-cease-subcode-02 */ 268 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX 1 269 static const struct tok bgp_notify_minor_cease_values[] = { 270 { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"}, 271 { 2, "Administratively Shutdown"}, 272 { 3, "Peer Unconfigured"}, 273 { 4, "Administratively Reset"}, 274 { 5, "Connection Rejected"}, 275 { 6, "Other Configuration Change"}, 276 { 7, "Connection Collision Resolution"}, 277 { 0, NULL} 278 }; 279 280 static const struct tok bgp_notify_minor_msg_values[] = { 281 { 1, "Connection Not Synchronized"}, 282 { 2, "Bad Message Length"}, 283 { 3, "Bad Message Type"}, 284 { 0, NULL} 285 }; 286 287 static const struct tok bgp_notify_minor_open_values[] = { 288 { 1, "Unsupported Version Number"}, 289 { 2, "Bad Peer AS"}, 290 { 3, "Bad BGP Identifier"}, 291 { 4, "Unsupported Optional Parameter"}, 292 { 5, "Authentication Failure"}, 293 { 6, "Unacceptable Hold Time"}, 294 { 7, "Capability Message Error"}, 295 { 0, NULL} 296 }; 297 298 static const struct tok bgp_notify_minor_update_values[] = { 299 { 1, "Malformed Attribute List"}, 300 { 2, "Unrecognized Well-known Attribute"}, 301 { 3, "Missing Well-known Attribute"}, 302 { 4, "Attribute Flags Error"}, 303 { 5, "Attribute Length Error"}, 304 { 6, "Invalid ORIGIN Attribute"}, 305 { 7, "AS Routing Loop"}, 306 { 8, "Invalid NEXT_HOP Attribute"}, 307 { 9, "Optional Attribute Error"}, 308 { 10, "Invalid Network Field"}, 309 { 11, "Malformed AS_PATH"}, 310 { 0, NULL} 311 }; 312 313 static const struct tok bgp_notify_minor_fsm_values[] = { 314 { 1, "In OpenSent State"}, 315 { 2, "In OpenConfirm State"}, 316 { 3, "In Established State"}, 317 { 0, NULL } 318 }; 319 320 static const struct tok bgp_notify_minor_cap_values[] = { 321 { 1, "Invalid Action Value" }, 322 { 2, "Invalid Capability Length" }, 323 { 3, "Malformed Capability Value" }, 324 { 4, "Unsupported Capability Code" }, 325 { 0, NULL } 326 }; 327 328 static const struct tok bgp_origin_values[] = { 329 { 0, "IGP"}, 330 { 1, "EGP"}, 331 { 2, "Incomplete"}, 332 { 0, NULL} 333 }; 334 335 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1 336 #define BGP_PMSI_TUNNEL_LDP_P2MP 2 337 #define BGP_PMSI_TUNNEL_PIM_SSM 3 338 #define BGP_PMSI_TUNNEL_PIM_SM 4 339 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5 340 #define BGP_PMSI_TUNNEL_INGRESS 6 341 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7 342 343 static const struct tok bgp_pmsi_tunnel_values[] = { 344 { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"}, 345 { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"}, 346 { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"}, 347 { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"}, 348 { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"}, 349 { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"}, 350 { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"}, 351 { 0, NULL} 352 }; 353 354 static const struct tok bgp_pmsi_flag_values[] = { 355 { 0x01, "Leaf Information required"}, 356 { 0, NULL} 357 }; 358 359 #define BGP_AIGP_TLV 1 360 361 static const struct tok bgp_aigp_values[] = { 362 { BGP_AIGP_TLV, "AIGP"}, 363 { 0, NULL} 364 }; 365 366 /* Subsequent address family identifier, RFC2283 section 7 */ 367 #define SAFNUM_RES 0 368 #define SAFNUM_UNICAST 1 369 #define SAFNUM_MULTICAST 2 370 #define SAFNUM_UNIMULTICAST 3 /* deprecated now */ 371 /* labeled BGP RFC3107 */ 372 #define SAFNUM_LABUNICAST 4 373 /* RFC6514 */ 374 #define SAFNUM_MULTICAST_VPN 5 375 /* draft-nalawade-kapoor-tunnel-safi */ 376 #define SAFNUM_TUNNEL 64 377 /* RFC4761 */ 378 #define SAFNUM_VPLS 65 379 /* RFC6037 */ 380 #define SAFNUM_MDT 66 381 /* RFC4364 */ 382 #define SAFNUM_VPNUNICAST 128 383 /* RFC6513 */ 384 #define SAFNUM_VPNMULTICAST 129 385 #define SAFNUM_VPNUNIMULTICAST 130 /* deprecated now */ 386 /* RFC4684 */ 387 #define SAFNUM_RT_ROUTING_INFO 132 388 389 #define BGP_VPN_RD_LEN 8 390 391 static const struct tok bgp_safi_values[] = { 392 { SAFNUM_RES, "Reserved"}, 393 { SAFNUM_UNICAST, "Unicast"}, 394 { SAFNUM_MULTICAST, "Multicast"}, 395 { SAFNUM_UNIMULTICAST, "Unicast+Multicast"}, 396 { SAFNUM_LABUNICAST, "labeled Unicast"}, 397 { SAFNUM_TUNNEL, "Tunnel"}, 398 { SAFNUM_VPLS, "VPLS"}, 399 { SAFNUM_MDT, "MDT"}, 400 { SAFNUM_VPNUNICAST, "labeled VPN Unicast"}, 401 { SAFNUM_VPNMULTICAST, "labeled VPN Multicast"}, 402 { SAFNUM_VPNUNIMULTICAST, "labeled VPN Unicast+Multicast"}, 403 { SAFNUM_RT_ROUTING_INFO, "Route Target Routing Information"}, 404 { SAFNUM_MULTICAST_VPN, "Multicast VPN"}, 405 { 0, NULL } 406 }; 407 408 /* well-known community */ 409 #define BGP_COMMUNITY_NO_EXPORT 0xffffff01 410 #define BGP_COMMUNITY_NO_ADVERT 0xffffff02 411 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03 412 413 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */ 414 #define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */ 415 #define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */ 416 #define BGP_EXT_COM_RT_2 0x0202 /* Route Target,Format AN(4bytes):local(2bytes) */ 417 #define BGP_EXT_COM_RO_0 0x0003 /* Route Origin,Format AS(2bytes):AN(4bytes) */ 418 #define BGP_EXT_COM_RO_1 0x0103 /* Route Origin,Format IP address:AN(2bytes) */ 419 #define BGP_EXT_COM_RO_2 0x0203 /* Route Origin,Format AN(4bytes):local(2bytes) */ 420 #define BGP_EXT_COM_LINKBAND 0x4004 /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */ 421 /* rfc2547 bgp-mpls-vpns */ 422 #define BGP_EXT_COM_VPN_ORIGIN 0x0005 /* OSPF Domain ID / VPN of Origin - draft-rosen-vpns-ospf-bgp-mpls */ 423 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105 /* duplicate - keep for backwards compatability */ 424 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205 /* duplicate - keep for backwards compatability */ 425 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005 /* duplicate - keep for backwards compatability */ 426 427 #define BGP_EXT_COM_OSPF_RTYPE 0x0306 /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */ 428 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000 /* duplicate - keep for backwards compatability */ 429 430 #define BGP_EXT_COM_OSPF_RID 0x0107 /* OSPF Router ID,Format RouterID(4B):Unused(2B) */ 431 #define BGP_EXT_COM_OSPF_RID2 0x8001 /* duplicate - keep for backwards compatability */ 432 433 #define BGP_EXT_COM_L2INFO 0x800a /* draft-kompella-ppvpn-l2vpn */ 434 435 #define BGP_EXT_COM_SOURCE_AS 0x0009 /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 436 #define BGP_EXT_COM_VRF_RT_IMP 0x010b /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */ 437 #define BGP_EXT_COM_L2VPN_RT_0 0x000a /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */ 438 #define BGP_EXT_COM_L2VPN_RT_1 0xF10a /* L2VPN Identifier,Format IP address:AN(2bytes) */ 439 440 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml */ 441 #define BGP_EXT_COM_EIGRP_GEN 0x8800 442 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY 0x8801 443 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802 444 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU 0x8803 445 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID 0x8804 446 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805 447 448 static const struct tok bgp_extd_comm_flag_values[] = { 449 { 0x8000, "vendor-specific"}, 450 { 0x4000, "non-transitive"}, 451 { 0, NULL}, 452 }; 453 454 static const struct tok bgp_extd_comm_subtype_values[] = { 455 { BGP_EXT_COM_RT_0, "target"}, 456 { BGP_EXT_COM_RT_1, "target"}, 457 { BGP_EXT_COM_RT_2, "target"}, 458 { BGP_EXT_COM_RO_0, "origin"}, 459 { BGP_EXT_COM_RO_1, "origin"}, 460 { BGP_EXT_COM_RO_2, "origin"}, 461 { BGP_EXT_COM_LINKBAND, "link-BW"}, 462 { BGP_EXT_COM_VPN_ORIGIN, "ospf-domain"}, 463 { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"}, 464 { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"}, 465 { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"}, 466 { BGP_EXT_COM_OSPF_RTYPE, "ospf-route-type"}, 467 { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"}, 468 { BGP_EXT_COM_OSPF_RID, "ospf-router-id"}, 469 { BGP_EXT_COM_OSPF_RID2, "ospf-router-id"}, 470 { BGP_EXT_COM_L2INFO, "layer2-info"}, 471 { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" }, 472 { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" }, 473 { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" }, 474 { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" }, 475 { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" }, 476 { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" }, 477 { BGP_EXT_COM_SOURCE_AS, "source-AS" }, 478 { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"}, 479 { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"}, 480 { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"}, 481 { 0, NULL}, 482 }; 483 484 /* OSPF codes for BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls */ 485 #define BGP_OSPF_RTYPE_RTR 1 /* OSPF Router LSA */ 486 #define BGP_OSPF_RTYPE_NET 2 /* OSPF Network LSA */ 487 #define BGP_OSPF_RTYPE_SUM 3 /* OSPF Summary LSA */ 488 #define BGP_OSPF_RTYPE_EXT 5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */ 489 #define BGP_OSPF_RTYPE_NSSA 7 /* OSPF NSSA External*/ 490 #define BGP_OSPF_RTYPE_SHAM 129 /* OSPF-MPLS-VPN Sham link */ 491 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */ 492 493 static const struct tok bgp_extd_comm_ospf_rtype_values[] = { 494 { BGP_OSPF_RTYPE_RTR, "Router" }, 495 { BGP_OSPF_RTYPE_NET, "Network" }, 496 { BGP_OSPF_RTYPE_SUM, "Summary" }, 497 { BGP_OSPF_RTYPE_EXT, "External" }, 498 { BGP_OSPF_RTYPE_NSSA,"NSSA External" }, 499 { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" }, 500 { 0, NULL }, 501 }; 502 503 /* ADD-PATH Send/Receive field values */ 504 static const struct tok bgp_add_path_recvsend[] = { 505 { 1, "Receive" }, 506 { 2, "Send" }, 507 { 3, "Both" }, 508 { 0, NULL }, 509 }; 510 511 static char astostr[20]; 512 513 /* 514 * as_printf 515 * 516 * Convert an AS number into a string and return string pointer. 517 * 518 * Depending on bflag is set or not, AS number is converted into ASDOT notation 519 * or plain number notation. 520 * 521 */ 522 static char * 523 as_printf(netdissect_options *ndo, 524 char *str, int size, u_int asnum) 525 { 526 if (!ndo->ndo_bflag || asnum <= 0xFFFF) { 527 snprintf(str, size, "%u", asnum); 528 } else { 529 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF); 530 } 531 return str; 532 } 533 534 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv; 535 536 int 537 decode_prefix4(netdissect_options *ndo, 538 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 539 { 540 struct in_addr addr; 541 u_int plen, plenbytes; 542 543 ND_TCHECK(pptr[0]); 544 ITEMCHECK(1); 545 plen = pptr[0]; 546 if (32 < plen) 547 return -1; 548 itemlen -= 1; 549 550 memset(&addr, 0, sizeof(addr)); 551 plenbytes = (plen + 7) / 8; 552 ND_TCHECK2(pptr[1], plenbytes); 553 ITEMCHECK(plenbytes); 554 memcpy(&addr, &pptr[1], plenbytes); 555 if (plen % 8) { 556 ((u_char *)&addr)[plenbytes - 1] &= 557 ((0xff00 >> (plen % 8)) & 0xff); 558 } 559 snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen); 560 return 1 + plenbytes; 561 562 trunc: 563 return -2; 564 565 badtlv: 566 return -3; 567 } 568 569 static int 570 decode_labeled_prefix4(netdissect_options *ndo, 571 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 572 { 573 struct in_addr addr; 574 u_int plen, plenbytes; 575 576 /* prefix length and label = 4 bytes */ 577 ND_TCHECK2(pptr[0], 4); 578 ITEMCHECK(4); 579 plen = pptr[0]; /* get prefix length */ 580 581 /* this is one of the weirdnesses of rfc3107 582 the label length (actually the label + COS bits) 583 is added to the prefix length; 584 we also do only read out just one label - 585 there is no real application for advertisement of 586 stacked labels in a single BGP message 587 */ 588 589 if (24 > plen) 590 return -1; 591 592 plen-=24; /* adjust prefixlen - labellength */ 593 594 if (32 < plen) 595 return -1; 596 itemlen -= 4; 597 598 memset(&addr, 0, sizeof(addr)); 599 plenbytes = (plen + 7) / 8; 600 ND_TCHECK2(pptr[4], plenbytes); 601 ITEMCHECK(plenbytes); 602 memcpy(&addr, &pptr[4], plenbytes); 603 if (plen % 8) { 604 ((u_char *)&addr)[plenbytes - 1] &= 605 ((0xff00 >> (plen % 8)) & 0xff); 606 } 607 /* the label may get offsetted by 4 bits so lets shift it right */ 608 snprintf(buf, buflen, "%s/%d, label:%u %s", 609 ipaddr_string(ndo, &addr), 610 plen, 611 EXTRACT_24BITS(pptr+1)>>4, 612 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 613 614 return 4 + plenbytes; 615 616 trunc: 617 return -2; 618 619 badtlv: 620 return -3; 621 } 622 623 /* 624 * bgp_vpn_ip_print 625 * 626 * print an ipv4 or ipv6 address into a buffer dependend on address length. 627 */ 628 static char * 629 bgp_vpn_ip_print(netdissect_options *ndo, 630 const u_char *pptr, u_int addr_length) 631 { 632 633 /* worst case string is s fully formatted v6 address */ 634 static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")]; 635 char *pos = addr; 636 637 switch(addr_length) { 638 case (sizeof(struct in_addr) << 3): /* 32 */ 639 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 640 snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr)); 641 break; 642 case (sizeof(struct in6_addr) << 3): /* 128 */ 643 ND_TCHECK2(pptr[0], sizeof(struct in6_addr)); 644 snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr)); 645 break; 646 default: 647 snprintf(pos, sizeof(addr), "bogus address length %u", addr_length); 648 break; 649 } 650 pos += strlen(pos); 651 652 trunc: 653 *(pos) = '\0'; 654 return (addr); 655 } 656 657 /* 658 * bgp_vpn_sg_print 659 * 660 * print an multicast s,g entry into a buffer. 661 * the s,g entry is encoded like this. 662 * 663 * +-----------------------------------+ 664 * | Multicast Source Length (1 octet) | 665 * +-----------------------------------+ 666 * | Multicast Source (Variable) | 667 * +-----------------------------------+ 668 * | Multicast Group Length (1 octet) | 669 * +-----------------------------------+ 670 * | Multicast Group (Variable) | 671 * +-----------------------------------+ 672 * 673 * return the number of bytes read from the wire. 674 */ 675 static int 676 bgp_vpn_sg_print(netdissect_options *ndo, 677 const u_char *pptr, char *buf, u_int buflen) 678 { 679 uint8_t addr_length; 680 u_int total_length, offset; 681 682 total_length = 0; 683 684 /* Source address length, encoded in bits */ 685 ND_TCHECK2(pptr[0], 1); 686 addr_length = *pptr++; 687 688 /* Source address */ 689 ND_TCHECK2(pptr[0], (addr_length >> 3)); 690 total_length += (addr_length >> 3) + 1; 691 offset = strlen(buf); 692 if (addr_length) { 693 snprintf(buf + offset, buflen - offset, ", Source %s", 694 bgp_vpn_ip_print(ndo, pptr, addr_length)); 695 pptr += (addr_length >> 3); 696 } 697 698 /* Group address length, encoded in bits */ 699 ND_TCHECK2(pptr[0], 1); 700 addr_length = *pptr++; 701 702 /* Group address */ 703 ND_TCHECK2(pptr[0], (addr_length >> 3)); 704 total_length += (addr_length >> 3) + 1; 705 offset = strlen(buf); 706 if (addr_length) { 707 snprintf(buf + offset, buflen - offset, ", Group %s", 708 bgp_vpn_ip_print(ndo, pptr, addr_length)); 709 pptr += (addr_length >> 3); 710 } 711 712 trunc: 713 return (total_length); 714 } 715 716 /* RDs and RTs share the same semantics 717 * we use bgp_vpn_rd_print for 718 * printing route targets inside a NLRI */ 719 char * 720 bgp_vpn_rd_print(netdissect_options *ndo, 721 const u_char *pptr) 722 { 723 /* allocate space for the largest possible string */ 724 static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")]; 725 char *pos = rd; 726 727 /* ok lets load the RD format */ 728 switch (EXTRACT_16BITS(pptr)) { 729 730 /* 2-byte-AS:number fmt*/ 731 case 0: 732 snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)", 733 EXTRACT_16BITS(pptr+2), 734 EXTRACT_32BITS(pptr+4), 735 *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7)); 736 break; 737 /* IP-address:AS fmt*/ 738 739 case 1: 740 snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u", 741 *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6)); 742 break; 743 744 /* 4-byte-AS:number fmt*/ 745 case 2: 746 snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)", 747 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)), 748 EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4), 749 *(pptr+5), EXTRACT_16BITS(pptr+6)); 750 break; 751 default: 752 snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format"); 753 break; 754 } 755 pos += strlen(pos); 756 *(pos) = '\0'; 757 return (rd); 758 } 759 760 static int 761 decode_rt_routing_info(netdissect_options *ndo, 762 const u_char *pptr, char *buf, u_int buflen) 763 { 764 uint8_t route_target[8]; 765 u_int plen; 766 char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */ 767 768 /* NLRI "prefix length" from RFC 2858 Section 4. */ 769 ND_TCHECK(pptr[0]); 770 plen = pptr[0]; /* get prefix length */ 771 772 /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits. 773 * RFC 4684 Section 4 defines the layout of "origin AS" and "route 774 * target" fields inside the "prefix" depending on its length. 775 */ 776 if (0 == plen) { 777 /* Without "origin AS", without "route target". */ 778 snprintf(buf, buflen, "default route target"); 779 return 1; 780 } 781 782 if (32 > plen) 783 return -1; 784 785 /* With at least "origin AS", possibly with "route target". */ 786 ND_TCHECK_32BITS(pptr + 1); 787 as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_32BITS(pptr + 1)); 788 789 plen-=32; /* adjust prefix length */ 790 791 if (64 < plen) 792 return -1; 793 794 /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 } 795 * and gives the number of octets in the variable-length "route 796 * target" field inside this NLRI "prefix". Look for it. 797 */ 798 memset(&route_target, 0, sizeof(route_target)); 799 ND_TCHECK2(pptr[5], (plen + 7) / 8); 800 memcpy(&route_target, &pptr[5], (plen + 7) / 8); 801 /* Which specification says to do this? */ 802 if (plen % 8) { 803 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &= 804 ((0xff00 >> (plen % 8)) & 0xff); 805 } 806 snprintf(buf, buflen, "origin AS: %s, route target %s", 807 asbuf, 808 bgp_vpn_rd_print(ndo, (u_char *)&route_target)); 809 810 return 5 + (plen + 7) / 8; 811 812 trunc: 813 return -2; 814 } 815 816 static int 817 decode_labeled_vpn_prefix4(netdissect_options *ndo, 818 const u_char *pptr, char *buf, u_int buflen) 819 { 820 struct in_addr addr; 821 u_int plen; 822 823 ND_TCHECK(pptr[0]); 824 plen = pptr[0]; /* get prefix length */ 825 826 if ((24+64) > plen) 827 return -1; 828 829 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 830 831 if (32 < plen) 832 return -1; 833 834 memset(&addr, 0, sizeof(addr)); 835 ND_TCHECK2(pptr[12], (plen + 7) / 8); 836 memcpy(&addr, &pptr[12], (plen + 7) / 8); 837 if (plen % 8) { 838 ((u_char *)&addr)[(plen + 7) / 8 - 1] &= 839 ((0xff00 >> (plen % 8)) & 0xff); 840 } 841 /* the label may get offsetted by 4 bits so lets shift it right */ 842 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 843 bgp_vpn_rd_print(ndo, pptr+4), 844 ipaddr_string(ndo, &addr), 845 plen, 846 EXTRACT_24BITS(pptr+1)>>4, 847 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 848 849 return 12 + (plen + 7) / 8; 850 851 trunc: 852 return -2; 853 } 854 855 /* 856 * +-------------------------------+ 857 * | | 858 * | RD:IPv4-address (12 octets) | 859 * | | 860 * +-------------------------------+ 861 * | MDT Group-address (4 octets) | 862 * +-------------------------------+ 863 */ 864 865 #define MDT_VPN_NLRI_LEN 16 866 867 static int 868 decode_mdt_vpn_nlri(netdissect_options *ndo, 869 const u_char *pptr, char *buf, u_int buflen) 870 { 871 872 const u_char *rd; 873 const u_char *vpn_ip; 874 875 ND_TCHECK(pptr[0]); 876 877 /* if the NLRI is not predefined length, quit.*/ 878 if (*pptr != MDT_VPN_NLRI_LEN * 8) 879 return -1; 880 pptr++; 881 882 /* RD */ 883 ND_TCHECK2(pptr[0], 8); 884 rd = pptr; 885 pptr+=8; 886 887 /* IPv4 address */ 888 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 889 vpn_ip = pptr; 890 pptr+=sizeof(struct in_addr); 891 892 /* MDT Group Address */ 893 ND_TCHECK2(pptr[0], sizeof(struct in_addr)); 894 895 snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s", 896 bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr)); 897 898 return MDT_VPN_NLRI_LEN + 1; 899 900 trunc: 901 902 return -2; 903 } 904 905 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI 1 906 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI 2 907 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI 3 908 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4 909 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE 5 910 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN 6 911 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN 7 912 913 static const struct tok bgp_multicast_vpn_route_type_values[] = { 914 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"}, 915 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"}, 916 { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"}, 917 { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"}, 918 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"}, 919 { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"}, 920 { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"}, 921 { 0, NULL} 922 }; 923 924 UNALIGNED_OK 925 static int 926 decode_multicast_vpn(netdissect_options *ndo, 927 const u_char *pptr, char *buf, u_int buflen) 928 { 929 uint8_t route_type, route_length, addr_length, sg_length; 930 u_int offset; 931 932 ND_TCHECK2(pptr[0], 2); 933 route_type = *pptr++; 934 route_length = *pptr++; 935 936 snprintf(buf, buflen, "Route-Type: %s (%u), length: %u", 937 tok2str(bgp_multicast_vpn_route_type_values, 938 "Unknown", route_type), 939 route_type, route_length); 940 941 switch(route_type) { 942 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI: 943 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 944 offset = strlen(buf); 945 snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s", 946 bgp_vpn_rd_print(ndo, pptr), 947 bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN, 948 (route_length - BGP_VPN_RD_LEN) << 3)); 949 break; 950 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI: 951 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); 952 offset = strlen(buf); 953 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 954 bgp_vpn_rd_print(ndo, pptr), 955 as_printf(ndo, astostr, sizeof(astostr), 956 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 957 break; 958 959 case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI: 960 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 961 offset = strlen(buf); 962 snprintf(buf + offset, buflen - offset, ", RD: %s", 963 bgp_vpn_rd_print(ndo, pptr)); 964 pptr += BGP_VPN_RD_LEN; 965 966 sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen); 967 addr_length = route_length - sg_length; 968 969 ND_TCHECK2(pptr[0], addr_length); 970 offset = strlen(buf); 971 snprintf(buf + offset, buflen - offset, ", Originator %s", 972 bgp_vpn_ip_print(ndo, pptr, addr_length << 3)); 973 break; 974 975 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE: 976 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN); 977 offset = strlen(buf); 978 snprintf(buf + offset, buflen - offset, ", RD: %s", 979 bgp_vpn_rd_print(ndo, pptr)); 980 pptr += BGP_VPN_RD_LEN; 981 982 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 983 break; 984 985 case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */ 986 case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN: 987 ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4); 988 offset = strlen(buf); 989 snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s", 990 bgp_vpn_rd_print(ndo, pptr), 991 as_printf(ndo, astostr, sizeof(astostr), 992 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN))); 993 pptr += BGP_VPN_RD_LEN + 4; 994 995 bgp_vpn_sg_print(ndo, pptr, buf, buflen); 996 break; 997 998 /* 999 * no per route-type printing yet. 1000 */ 1001 case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF: 1002 default: 1003 break; 1004 } 1005 1006 return route_length + 2; 1007 1008 trunc: 1009 return -2; 1010 } 1011 1012 /* 1013 * As I remember, some versions of systems have an snprintf() that 1014 * returns -1 if the buffer would have overflowed. If the return 1015 * value is negative, set buflen to 0, to indicate that we've filled 1016 * the buffer up. 1017 * 1018 * If the return value is greater than buflen, that means that 1019 * the buffer would have overflowed; again, set buflen to 0 in 1020 * that case. 1021 */ 1022 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \ 1023 if (stringlen<0) \ 1024 buflen=0; \ 1025 else if ((u_int)stringlen>buflen) \ 1026 buflen=0; \ 1027 else { \ 1028 buflen-=stringlen; \ 1029 buf+=stringlen; \ 1030 } 1031 1032 static int 1033 decode_labeled_vpn_l2(netdissect_options *ndo, 1034 const u_char *pptr, char *buf, u_int buflen) 1035 { 1036 int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len; 1037 1038 ND_TCHECK2(pptr[0], 2); 1039 plen=EXTRACT_16BITS(pptr); 1040 tlen=plen; 1041 pptr+=2; 1042 /* Old and new L2VPN NLRI share AFI/SAFI 1043 * -> Assume a 12 Byte-length NLRI is auto-discovery-only 1044 * and > 17 as old format. Complain for the middle case 1045 */ 1046 if (plen==12) { 1047 /* assume AD-only with RD, BGPNH */ 1048 ND_TCHECK2(pptr[0],12); 1049 buf[0]='\0'; 1050 stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s", 1051 bgp_vpn_rd_print(ndo, pptr), 1052 ipaddr_string(ndo, pptr+8) 1053 ); 1054 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1055 pptr+=12; 1056 tlen-=12; 1057 return plen; 1058 } else if (plen>17) { 1059 /* assume old format */ 1060 /* RD, ID, LBLKOFF, LBLBASE */ 1061 1062 ND_TCHECK2(pptr[0],15); 1063 buf[0]='\0'; 1064 stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u", 1065 bgp_vpn_rd_print(ndo, pptr), 1066 EXTRACT_16BITS(pptr+8), 1067 EXTRACT_16BITS(pptr+10), 1068 EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */ 1069 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1070 pptr+=15; 1071 tlen-=15; 1072 1073 /* ok now the variable part - lets read out TLVs*/ 1074 while (tlen>0) { 1075 if (tlen < 3) 1076 return -1; 1077 ND_TCHECK2(pptr[0], 3); 1078 tlv_type=*pptr++; 1079 tlv_len=EXTRACT_16BITS(pptr); 1080 ttlv_len=tlv_len; 1081 pptr+=2; 1082 1083 switch(tlv_type) { 1084 case 1: 1085 if (buflen!=0) { 1086 stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x", 1087 tlv_type, 1088 tlv_len); 1089 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1090 } 1091 ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */ 1092 while (ttlv_len>0) { 1093 ND_TCHECK(pptr[0]); 1094 if (buflen!=0) { 1095 stringlen=snprintf(buf,buflen, "%02x",*pptr++); 1096 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1097 } 1098 ttlv_len--; 1099 } 1100 break; 1101 default: 1102 if (buflen!=0) { 1103 stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u", 1104 tlv_type, 1105 tlv_len); 1106 UPDATE_BUF_BUFLEN(buf, buflen, stringlen); 1107 } 1108 break; 1109 } 1110 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */ 1111 } 1112 return plen+2; 1113 1114 } else { 1115 /* complain bitterly ? */ 1116 /* fall through */ 1117 goto trunc; 1118 } 1119 1120 trunc: 1121 return -2; 1122 } 1123 1124 int 1125 decode_prefix6(netdissect_options *ndo, 1126 const u_char *pd, u_int itemlen, char *buf, u_int buflen) 1127 { 1128 struct in6_addr addr; 1129 u_int plen, plenbytes; 1130 1131 ND_TCHECK(pd[0]); 1132 ITEMCHECK(1); 1133 plen = pd[0]; 1134 if (128 < plen) 1135 return -1; 1136 itemlen -= 1; 1137 1138 memset(&addr, 0, sizeof(addr)); 1139 plenbytes = (plen + 7) / 8; 1140 ND_TCHECK2(pd[1], plenbytes); 1141 ITEMCHECK(plenbytes); 1142 memcpy(&addr, &pd[1], plenbytes); 1143 if (plen % 8) { 1144 addr.s6_addr[plenbytes - 1] &= 1145 ((0xff00 >> (plen % 8)) & 0xff); 1146 } 1147 snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen); 1148 return 1 + plenbytes; 1149 1150 trunc: 1151 return -2; 1152 1153 badtlv: 1154 return -3; 1155 } 1156 1157 static int 1158 decode_labeled_prefix6(netdissect_options *ndo, 1159 const u_char *pptr, u_int itemlen, char *buf, u_int buflen) 1160 { 1161 struct in6_addr addr; 1162 u_int plen, plenbytes; 1163 1164 /* prefix length and label = 4 bytes */ 1165 ND_TCHECK2(pptr[0], 4); 1166 ITEMCHECK(4); 1167 plen = pptr[0]; /* get prefix length */ 1168 1169 if (24 > plen) 1170 return -1; 1171 1172 plen-=24; /* adjust prefixlen - labellength */ 1173 1174 if (128 < plen) 1175 return -1; 1176 itemlen -= 4; 1177 1178 memset(&addr, 0, sizeof(addr)); 1179 plenbytes = (plen + 7) / 8; 1180 ND_TCHECK2(pptr[4], plenbytes); 1181 memcpy(&addr, &pptr[4], plenbytes); 1182 if (plen % 8) { 1183 addr.s6_addr[plenbytes - 1] &= 1184 ((0xff00 >> (plen % 8)) & 0xff); 1185 } 1186 /* the label may get offsetted by 4 bits so lets shift it right */ 1187 snprintf(buf, buflen, "%s/%d, label:%u %s", 1188 ip6addr_string(ndo, &addr), 1189 plen, 1190 EXTRACT_24BITS(pptr+1)>>4, 1191 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1192 1193 return 4 + plenbytes; 1194 1195 trunc: 1196 return -2; 1197 1198 badtlv: 1199 return -3; 1200 } 1201 1202 static int 1203 decode_labeled_vpn_prefix6(netdissect_options *ndo, 1204 const u_char *pptr, char *buf, u_int buflen) 1205 { 1206 struct in6_addr addr; 1207 u_int plen; 1208 1209 ND_TCHECK(pptr[0]); 1210 plen = pptr[0]; /* get prefix length */ 1211 1212 if ((24+64) > plen) 1213 return -1; 1214 1215 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1216 1217 if (128 < plen) 1218 return -1; 1219 1220 memset(&addr, 0, sizeof(addr)); 1221 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1222 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1223 if (plen % 8) { 1224 addr.s6_addr[(plen + 7) / 8 - 1] &= 1225 ((0xff00 >> (plen % 8)) & 0xff); 1226 } 1227 /* the label may get offsetted by 4 bits so lets shift it right */ 1228 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1229 bgp_vpn_rd_print(ndo, pptr+4), 1230 ip6addr_string(ndo, &addr), 1231 plen, 1232 EXTRACT_24BITS(pptr+1)>>4, 1233 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1234 1235 return 12 + (plen + 7) / 8; 1236 1237 trunc: 1238 return -2; 1239 } 1240 1241 static int 1242 decode_clnp_prefix(netdissect_options *ndo, 1243 const u_char *pptr, char *buf, u_int buflen) 1244 { 1245 uint8_t addr[19]; 1246 u_int plen; 1247 1248 ND_TCHECK(pptr[0]); 1249 plen = pptr[0]; /* get prefix length */ 1250 1251 if (152 < plen) 1252 return -1; 1253 1254 memset(&addr, 0, sizeof(addr)); 1255 ND_TCHECK2(pptr[4], (plen + 7) / 8); 1256 memcpy(&addr, &pptr[4], (plen + 7) / 8); 1257 if (plen % 8) { 1258 addr[(plen + 7) / 8 - 1] &= 1259 ((0xff00 >> (plen % 8)) & 0xff); 1260 } 1261 snprintf(buf, buflen, "%s/%d", 1262 isonsap_string(ndo, addr,(plen + 7) / 8), 1263 plen); 1264 1265 return 1 + (plen + 7) / 8; 1266 1267 trunc: 1268 return -2; 1269 } 1270 1271 static int 1272 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo, 1273 const u_char *pptr, char *buf, u_int buflen) 1274 { 1275 uint8_t addr[19]; 1276 u_int plen; 1277 1278 ND_TCHECK(pptr[0]); 1279 plen = pptr[0]; /* get prefix length */ 1280 1281 if ((24+64) > plen) 1282 return -1; 1283 1284 plen-=(24+64); /* adjust prefixlen - labellength - RD len*/ 1285 1286 if (152 < plen) 1287 return -1; 1288 1289 memset(&addr, 0, sizeof(addr)); 1290 ND_TCHECK2(pptr[12], (plen + 7) / 8); 1291 memcpy(&addr, &pptr[12], (plen + 7) / 8); 1292 if (plen % 8) { 1293 addr[(plen + 7) / 8 - 1] &= 1294 ((0xff00 >> (plen % 8)) & 0xff); 1295 } 1296 /* the label may get offsetted by 4 bits so lets shift it right */ 1297 snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s", 1298 bgp_vpn_rd_print(ndo, pptr+4), 1299 isonsap_string(ndo, addr,(plen + 7) / 8), 1300 plen, 1301 EXTRACT_24BITS(pptr+1)>>4, 1302 ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" ); 1303 1304 return 12 + (plen + 7) / 8; 1305 1306 trunc: 1307 return -2; 1308 } 1309 1310 /* 1311 * bgp_attr_get_as_size 1312 * 1313 * Try to find the size of the ASs encoded in an as-path. It is not obvious, as 1314 * both Old speakers that do not support 4 byte AS, and the new speakers that do 1315 * support, exchange AS-Path with the same path-attribute type value 0x02. 1316 */ 1317 static int 1318 bgp_attr_get_as_size(netdissect_options *ndo, 1319 uint8_t bgpa_type, const u_char *pptr, int len) 1320 { 1321 const u_char *tptr = pptr; 1322 1323 /* 1324 * If the path attribute is the optional AS4 path type, then we already 1325 * know, that ASs must be encoded in 4 byte format. 1326 */ 1327 if (bgpa_type == BGPTYPE_AS4_PATH) { 1328 return 4; 1329 } 1330 1331 /* 1332 * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path 1333 * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes 1334 * each. 1335 */ 1336 while (tptr < pptr + len) { 1337 ND_TCHECK(tptr[0]); 1338 1339 /* 1340 * If we do not find a valid segment type, our guess might be wrong. 1341 */ 1342 if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) { 1343 goto trunc; 1344 } 1345 ND_TCHECK(tptr[1]); 1346 tptr += 2 + tptr[1] * 2; 1347 } 1348 1349 /* 1350 * If we correctly reached end of the AS path attribute data content, 1351 * then most likely ASs were indeed encoded as 2 bytes. 1352 */ 1353 if (tptr == pptr + len) { 1354 return 2; 1355 } 1356 1357 trunc: 1358 1359 /* 1360 * We can come here, either we did not have enough data, or if we 1361 * try to decode 4 byte ASs in 2 byte format. Either way, return 4, 1362 * so that calller can try to decode each AS as of 4 bytes. If indeed 1363 * there was not enough data, it will crib and end the parse anyways. 1364 */ 1365 return 4; 1366 } 1367 1368 static int 1369 bgp_attr_print(netdissect_options *ndo, 1370 u_int atype, const u_char *pptr, u_int len, const unsigned attr_set_level) 1371 { 1372 int i; 1373 uint16_t af; 1374 uint8_t safi, snpa, nhlen; 1375 union { /* copy buffer for bandwidth values */ 1376 float f; 1377 uint32_t i; 1378 } bw; 1379 int advance; 1380 u_int tlen; 1381 const u_char *tptr; 1382 char buf[MAXHOSTNAMELEN + 100]; 1383 int as_size; 1384 1385 tptr = pptr; 1386 tlen=len; 1387 1388 switch (atype) { 1389 case BGPTYPE_ORIGIN: 1390 if (len != 1) 1391 ND_PRINT((ndo, "invalid len")); 1392 else { 1393 ND_TCHECK(*tptr); 1394 ND_PRINT((ndo, "%s", tok2str(bgp_origin_values, 1395 "Unknown Origin Typecode", 1396 tptr[0]))); 1397 } 1398 break; 1399 1400 /* 1401 * Process AS4 byte path and AS2 byte path attributes here. 1402 */ 1403 case BGPTYPE_AS4_PATH: 1404 case BGPTYPE_AS_PATH: 1405 if (len % 2) { 1406 ND_PRINT((ndo, "invalid len")); 1407 break; 1408 } 1409 if (!len) { 1410 ND_PRINT((ndo, "empty")); 1411 break; 1412 } 1413 1414 /* 1415 * BGP updates exchanged between New speakers that support 4 1416 * byte AS, ASs are always encoded in 4 bytes. There is no 1417 * definitive way to find this, just by the packet's 1418 * contents. So, check for packet's TLV's sanity assuming 1419 * 2 bytes first, and it does not pass, assume that ASs are 1420 * encoded in 4 bytes format and move on. 1421 */ 1422 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len); 1423 1424 while (tptr < pptr + len) { 1425 ND_TCHECK(tptr[0]); 1426 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values, 1427 "?", tptr[0]))); 1428 ND_TCHECK(tptr[1]); 1429 for (i = 0; i < tptr[1] * as_size; i += as_size) { 1430 ND_TCHECK2(tptr[2 + i], as_size); 1431 ND_PRINT((ndo, "%s ", 1432 as_printf(ndo, astostr, sizeof(astostr), 1433 as_size == 2 ? 1434 EXTRACT_16BITS(&tptr[2 + i]) : 1435 EXTRACT_32BITS(&tptr[2 + i])))); 1436 } 1437 ND_TCHECK(tptr[0]); 1438 ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values, 1439 "?", tptr[0]))); 1440 ND_TCHECK(tptr[1]); 1441 tptr += 2 + tptr[1] * as_size; 1442 } 1443 break; 1444 case BGPTYPE_NEXT_HOP: 1445 if (len != 4) 1446 ND_PRINT((ndo, "invalid len")); 1447 else { 1448 ND_TCHECK2(tptr[0], 4); 1449 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr))); 1450 } 1451 break; 1452 case BGPTYPE_MULTI_EXIT_DISC: 1453 case BGPTYPE_LOCAL_PREF: 1454 if (len != 4) 1455 ND_PRINT((ndo, "invalid len")); 1456 else { 1457 ND_TCHECK2(tptr[0], 4); 1458 ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr))); 1459 } 1460 break; 1461 case BGPTYPE_ATOMIC_AGGREGATE: 1462 if (len != 0) 1463 ND_PRINT((ndo, "invalid len")); 1464 break; 1465 case BGPTYPE_AGGREGATOR: 1466 1467 /* 1468 * Depending on the AS encoded is of 2 bytes or of 4 bytes, 1469 * the length of this PA can be either 6 bytes or 8 bytes. 1470 */ 1471 if (len != 6 && len != 8) { 1472 ND_PRINT((ndo, "invalid len")); 1473 break; 1474 } 1475 ND_TCHECK2(tptr[0], len); 1476 if (len == 6) { 1477 ND_PRINT((ndo, " AS #%s, origin %s", 1478 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)), 1479 ipaddr_string(ndo, tptr + 2))); 1480 } else { 1481 ND_PRINT((ndo, " AS #%s, origin %s", 1482 as_printf(ndo, astostr, sizeof(astostr), 1483 EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4))); 1484 } 1485 break; 1486 case BGPTYPE_AGGREGATOR4: 1487 if (len != 8) { 1488 ND_PRINT((ndo, "invalid len")); 1489 break; 1490 } 1491 ND_TCHECK2(tptr[0], 8); 1492 ND_PRINT((ndo, " AS #%s, origin %s", 1493 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)), 1494 ipaddr_string(ndo, tptr + 4))); 1495 break; 1496 case BGPTYPE_COMMUNITIES: 1497 if (len % 4) { 1498 ND_PRINT((ndo, "invalid len")); 1499 break; 1500 } 1501 while (tlen>0) { 1502 uint32_t comm; 1503 ND_TCHECK2(tptr[0], 4); 1504 comm = EXTRACT_32BITS(tptr); 1505 switch (comm) { 1506 case BGP_COMMUNITY_NO_EXPORT: 1507 ND_PRINT((ndo, " NO_EXPORT")); 1508 break; 1509 case BGP_COMMUNITY_NO_ADVERT: 1510 ND_PRINT((ndo, " NO_ADVERTISE")); 1511 break; 1512 case BGP_COMMUNITY_NO_EXPORT_SUBCONFED: 1513 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED")); 1514 break; 1515 default: 1516 ND_PRINT((ndo, "%u:%u%s", 1517 (comm >> 16) & 0xffff, 1518 comm & 0xffff, 1519 (tlen>4) ? ", " : "")); 1520 break; 1521 } 1522 tlen -=4; 1523 tptr +=4; 1524 } 1525 break; 1526 case BGPTYPE_ORIGINATOR_ID: 1527 if (len != 4) { 1528 ND_PRINT((ndo, "invalid len")); 1529 break; 1530 } 1531 ND_TCHECK2(tptr[0], 4); 1532 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr))); 1533 break; 1534 case BGPTYPE_CLUSTER_LIST: 1535 if (len % 4) { 1536 ND_PRINT((ndo, "invalid len")); 1537 break; 1538 } 1539 while (tlen>0) { 1540 ND_TCHECK2(tptr[0], 4); 1541 ND_PRINT((ndo, "%s%s", 1542 ipaddr_string(ndo, tptr), 1543 (tlen>4) ? ", " : "")); 1544 tlen -=4; 1545 tptr +=4; 1546 } 1547 break; 1548 case BGPTYPE_MP_REACH_NLRI: 1549 ND_TCHECK2(tptr[0], 3); 1550 af = EXTRACT_16BITS(tptr); 1551 safi = tptr[2]; 1552 1553 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1554 tok2str(af_values, "Unknown AFI", af), 1555 af, 1556 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1557 tok2str(bgp_safi_values, "Unknown SAFI", safi), 1558 safi)); 1559 1560 switch(af<<8 | safi) { 1561 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1562 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1563 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1564 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1565 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1566 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1567 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1568 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1569 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1570 case (AFNUM_INET<<8 | SAFNUM_MDT): 1571 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1572 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1573 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1574 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1575 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1576 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1577 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1578 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1579 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1580 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1581 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1582 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1583 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1584 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1585 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1586 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1587 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1588 break; 1589 default: 1590 ND_TCHECK2(tptr[0], tlen); 1591 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1592 if (ndo->ndo_vflag <= 1) 1593 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1594 goto done; 1595 break; 1596 } 1597 1598 tptr +=3; 1599 1600 ND_TCHECK(tptr[0]); 1601 nhlen = tptr[0]; 1602 tlen = nhlen; 1603 tptr++; 1604 1605 if (tlen) { 1606 int nnh = 0; 1607 ND_PRINT((ndo, "\n\t nexthop: ")); 1608 while (tlen > 0) { 1609 if ( nnh++ > 0 ) { 1610 ND_PRINT((ndo, ", " )); 1611 } 1612 switch(af<<8 | safi) { 1613 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1614 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1615 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1616 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1617 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1618 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): 1619 case (AFNUM_INET<<8 | SAFNUM_MDT): 1620 if (tlen < (int)sizeof(struct in_addr)) { 1621 ND_PRINT((ndo, "invalid len")); 1622 tlen = 0; 1623 } else { 1624 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1625 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr))); 1626 tlen -= sizeof(struct in_addr); 1627 tptr += sizeof(struct in_addr); 1628 } 1629 break; 1630 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1631 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1632 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1633 if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) { 1634 ND_PRINT((ndo, "invalid len")); 1635 tlen = 0; 1636 } else { 1637 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1638 ND_PRINT((ndo, "RD: %s, %s", 1639 bgp_vpn_rd_print(ndo, tptr), 1640 ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN))); 1641 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1642 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN); 1643 } 1644 break; 1645 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1646 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1647 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1648 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1649 if (tlen < (int)sizeof(struct in6_addr)) { 1650 ND_PRINT((ndo, "invalid len")); 1651 tlen = 0; 1652 } else { 1653 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)); 1654 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr))); 1655 tlen -= sizeof(struct in6_addr); 1656 tptr += sizeof(struct in6_addr); 1657 } 1658 break; 1659 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1660 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1661 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1662 if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) { 1663 ND_PRINT((ndo, "invalid len")); 1664 tlen = 0; 1665 } else { 1666 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1667 ND_PRINT((ndo, "RD: %s, %s", 1668 bgp_vpn_rd_print(ndo, tptr), 1669 ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN))); 1670 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1671 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN); 1672 } 1673 break; 1674 case (AFNUM_VPLS<<8 | SAFNUM_VPLS): 1675 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1676 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1677 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1678 if (tlen < (int)sizeof(struct in_addr)) { 1679 ND_PRINT((ndo, "invalid len")); 1680 tlen = 0; 1681 } else { 1682 ND_TCHECK2(tptr[0], sizeof(struct in_addr)); 1683 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr))); 1684 tlen -= (sizeof(struct in_addr)); 1685 tptr += (sizeof(struct in_addr)); 1686 } 1687 break; 1688 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1689 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1690 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1691 ND_TCHECK2(tptr[0], tlen); 1692 ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen))); 1693 tptr += tlen; 1694 tlen = 0; 1695 break; 1696 1697 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1698 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1699 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1700 if (tlen < BGP_VPN_RD_LEN+1) { 1701 ND_PRINT((ndo, "invalid len")); 1702 tlen = 0; 1703 } else { 1704 ND_TCHECK2(tptr[0], tlen); 1705 ND_PRINT((ndo, "RD: %s, %s", 1706 bgp_vpn_rd_print(ndo, tptr), 1707 isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN))); 1708 /* rfc986 mapped IPv4 address ? */ 1709 if (tlen == BGP_VPN_RD_LEN + 4 + sizeof(struct in_addr) 1710 && EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) == 0x47000601) 1711 ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4))); 1712 /* rfc1888 mapped IPv6 address ? */ 1713 else if (tlen == BGP_VPN_RD_LEN + 3 + sizeof(struct in6_addr) 1714 && EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) == 0x350000) 1715 ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3))); 1716 tptr += tlen; 1717 tlen = 0; 1718 } 1719 break; 1720 default: 1721 ND_TCHECK2(tptr[0], tlen); 1722 ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi)); 1723 if (ndo->ndo_vflag <= 1) 1724 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1725 tptr += tlen; 1726 tlen = 0; 1727 goto done; 1728 break; 1729 } 1730 } 1731 } 1732 ND_PRINT((ndo, ", nh-length: %u", nhlen)); 1733 tptr += tlen; 1734 1735 ND_TCHECK(tptr[0]); 1736 snpa = tptr[0]; 1737 tptr++; 1738 1739 if (snpa) { 1740 ND_PRINT((ndo, "\n\t %u SNPA", snpa)); 1741 for (/*nothing*/; snpa > 0; snpa--) { 1742 ND_TCHECK(tptr[0]); 1743 ND_PRINT((ndo, "\n\t %d bytes", tptr[0])); 1744 tptr += tptr[0] + 1; 1745 } 1746 } else { 1747 ND_PRINT((ndo, ", no SNPA")); 1748 } 1749 1750 while (tptr < pptr + len) { 1751 switch (af<<8 | safi) { 1752 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1753 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1754 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1755 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1756 if (advance == -1) 1757 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1758 else if (advance == -2) 1759 goto trunc; 1760 else if (advance == -3) 1761 break; /* bytes left, but not enough */ 1762 else 1763 ND_PRINT((ndo, "\n\t %s", buf)); 1764 break; 1765 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1766 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1767 if (advance == -1) 1768 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1769 else if (advance == -2) 1770 goto trunc; 1771 else if (advance == -3) 1772 break; /* bytes left, but not enough */ 1773 else 1774 ND_PRINT((ndo, "\n\t %s", buf)); 1775 break; 1776 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1777 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1778 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1779 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1780 if (advance == -1) 1781 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1782 else if (advance == -2) 1783 goto trunc; 1784 else 1785 ND_PRINT((ndo, "\n\t %s", buf)); 1786 break; 1787 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO): 1788 advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf)); 1789 if (advance == -1) 1790 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1791 else if (advance == -2) 1792 goto trunc; 1793 else 1794 ND_PRINT((ndo, "\n\t %s", buf)); 1795 break; 1796 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 1797 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 1798 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 1799 if (advance == -1) 1800 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1801 else if (advance == -2) 1802 goto trunc; 1803 else 1804 ND_PRINT((ndo, "\n\t %s", buf)); 1805 break; 1806 1807 case (AFNUM_INET<<8 | SAFNUM_MDT): 1808 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 1809 if (advance == -1) 1810 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1811 else if (advance == -2) 1812 goto trunc; 1813 else 1814 ND_PRINT((ndo, "\n\t %s", buf)); 1815 break; 1816 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1817 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1818 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1819 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1820 if (advance == -1) 1821 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1822 else if (advance == -2) 1823 goto trunc; 1824 else if (advance == -3) 1825 break; /* bytes left, but not enough */ 1826 else 1827 ND_PRINT((ndo, "\n\t %s", buf)); 1828 break; 1829 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1830 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1831 if (advance == -1) 1832 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1833 else if (advance == -2) 1834 goto trunc; 1835 else if (advance == -3) 1836 break; /* bytes left, but not enough */ 1837 else 1838 ND_PRINT((ndo, "\n\t %s", buf)); 1839 break; 1840 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1841 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1842 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1843 advance = decode_labeled_vpn_prefix6(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_VPLS<<8 | SAFNUM_VPLS): 1852 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1853 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1854 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1855 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1856 if (advance == -1) 1857 ND_PRINT((ndo, "\n\t (illegal length)")); 1858 else if (advance == -2) 1859 goto trunc; 1860 else 1861 ND_PRINT((ndo, "\n\t %s", buf)); 1862 break; 1863 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 1864 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 1865 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 1866 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1867 if (advance == -1) 1868 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1869 else if (advance == -2) 1870 goto trunc; 1871 else 1872 ND_PRINT((ndo, "\n\t %s", buf)); 1873 break; 1874 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 1875 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 1876 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 1877 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 1878 if (advance == -1) 1879 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1880 else if (advance == -2) 1881 goto trunc; 1882 else 1883 ND_PRINT((ndo, "\n\t %s", buf)); 1884 break; 1885 default: 1886 ND_TCHECK2(*tptr,tlen); 1887 ND_PRINT((ndo, "\n\t no AFI %u / SAFI %u decoder", af, safi)); 1888 if (ndo->ndo_vflag <= 1) 1889 print_unknown_data(ndo, tptr, "\n\t ", tlen); 1890 advance = 0; 1891 tptr = pptr + len; 1892 break; 1893 } 1894 if (advance < 0) 1895 break; 1896 tptr += advance; 1897 } 1898 done: 1899 break; 1900 1901 case BGPTYPE_MP_UNREACH_NLRI: 1902 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE); 1903 af = EXTRACT_16BITS(tptr); 1904 safi = tptr[2]; 1905 1906 ND_PRINT((ndo, "\n\t AFI: %s (%u), %sSAFI: %s (%u)", 1907 tok2str(af_values, "Unknown AFI", af), 1908 af, 1909 (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */ 1910 tok2str(bgp_safi_values, "Unknown SAFI", safi), 1911 safi)); 1912 1913 if (len == BGP_MP_NLRI_MINSIZE) 1914 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 1915 1916 tptr += 3; 1917 1918 while (tptr < pptr + len) { 1919 switch (af<<8 | safi) { 1920 case (AFNUM_INET<<8 | SAFNUM_UNICAST): 1921 case (AFNUM_INET<<8 | SAFNUM_MULTICAST): 1922 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST): 1923 advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1924 if (advance == -1) 1925 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1926 else if (advance == -2) 1927 goto trunc; 1928 else if (advance == -3) 1929 break; /* bytes left, but not enough */ 1930 else 1931 ND_PRINT((ndo, "\n\t %s", buf)); 1932 break; 1933 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST): 1934 advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf)); 1935 if (advance == -1) 1936 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1937 else if (advance == -2) 1938 goto trunc; 1939 else if (advance == -3) 1940 break; /* bytes left, but not enough */ 1941 else 1942 ND_PRINT((ndo, "\n\t %s", buf)); 1943 break; 1944 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST): 1945 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST): 1946 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST): 1947 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf)); 1948 if (advance == -1) 1949 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1950 else if (advance == -2) 1951 goto trunc; 1952 else 1953 ND_PRINT((ndo, "\n\t %s", buf)); 1954 break; 1955 case (AFNUM_INET6<<8 | SAFNUM_UNICAST): 1956 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST): 1957 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST): 1958 advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1959 if (advance == -1) 1960 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1961 else if (advance == -2) 1962 goto trunc; 1963 else if (advance == -3) 1964 break; /* bytes left, but not enough */ 1965 else 1966 ND_PRINT((ndo, "\n\t %s", buf)); 1967 break; 1968 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST): 1969 advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf)); 1970 if (advance == -1) 1971 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 1972 else if (advance == -2) 1973 goto trunc; 1974 else if (advance == -3) 1975 break; /* bytes left, but not enough */ 1976 else 1977 ND_PRINT((ndo, "\n\t %s", buf)); 1978 break; 1979 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST): 1980 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST): 1981 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST): 1982 advance = decode_labeled_vpn_prefix6(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_VPLS<<8 | SAFNUM_VPLS): 1991 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST): 1992 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST): 1993 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST): 1994 advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf)); 1995 if (advance == -1) 1996 ND_PRINT((ndo, "\n\t (illegal length)")); 1997 else if (advance == -2) 1998 goto trunc; 1999 else 2000 ND_PRINT((ndo, "\n\t %s", buf)); 2001 break; 2002 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST): 2003 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST): 2004 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST): 2005 advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 2006 if (advance == -1) 2007 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2008 else if (advance == -2) 2009 goto trunc; 2010 else 2011 ND_PRINT((ndo, "\n\t %s", buf)); 2012 break; 2013 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST): 2014 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST): 2015 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST): 2016 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf)); 2017 if (advance == -1) 2018 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2019 else if (advance == -2) 2020 goto trunc; 2021 else 2022 ND_PRINT((ndo, "\n\t %s", buf)); 2023 break; 2024 case (AFNUM_INET<<8 | SAFNUM_MDT): 2025 advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf)); 2026 if (advance == -1) 2027 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2028 else if (advance == -2) 2029 goto trunc; 2030 else 2031 ND_PRINT((ndo, "\n\t %s", buf)); 2032 break; 2033 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */ 2034 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN): 2035 advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf)); 2036 if (advance == -1) 2037 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2038 else if (advance == -2) 2039 goto trunc; 2040 else 2041 ND_PRINT((ndo, "\n\t %s", buf)); 2042 break; 2043 default: 2044 ND_TCHECK2(*(tptr-3),tlen); 2045 ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi)); 2046 if (ndo->ndo_vflag <= 1) 2047 print_unknown_data(ndo, tptr-3, "\n\t ", tlen); 2048 advance = 0; 2049 tptr = pptr + len; 2050 break; 2051 } 2052 if (advance < 0) 2053 break; 2054 tptr += advance; 2055 } 2056 break; 2057 case BGPTYPE_EXTD_COMMUNITIES: 2058 if (len % 8) { 2059 ND_PRINT((ndo, "invalid len")); 2060 break; 2061 } 2062 while (tlen>0) { 2063 uint16_t extd_comm; 2064 2065 ND_TCHECK2(tptr[0], 2); 2066 extd_comm=EXTRACT_16BITS(tptr); 2067 2068 ND_PRINT((ndo, "\n\t %s (0x%04x), Flags [%s]", 2069 tok2str(bgp_extd_comm_subtype_values, 2070 "unknown extd community typecode", 2071 extd_comm), 2072 extd_comm, 2073 bittok2str(bgp_extd_comm_flag_values, "none", extd_comm))); 2074 2075 ND_TCHECK2(*(tptr+2), 6); 2076 switch(extd_comm) { 2077 case BGP_EXT_COM_RT_0: 2078 case BGP_EXT_COM_RO_0: 2079 case BGP_EXT_COM_L2VPN_RT_0: 2080 ND_PRINT((ndo, ": %u:%u (= %s)", 2081 EXTRACT_16BITS(tptr+2), 2082 EXTRACT_32BITS(tptr+4), 2083 ipaddr_string(ndo, tptr+4))); 2084 break; 2085 case BGP_EXT_COM_RT_1: 2086 case BGP_EXT_COM_RO_1: 2087 case BGP_EXT_COM_L2VPN_RT_1: 2088 case BGP_EXT_COM_VRF_RT_IMP: 2089 ND_PRINT((ndo, ": %s:%u", 2090 ipaddr_string(ndo, tptr+2), 2091 EXTRACT_16BITS(tptr+6))); 2092 break; 2093 case BGP_EXT_COM_RT_2: 2094 case BGP_EXT_COM_RO_2: 2095 ND_PRINT((ndo, ": %s:%u", 2096 as_printf(ndo, astostr, sizeof(astostr), 2097 EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6))); 2098 break; 2099 case BGP_EXT_COM_LINKBAND: 2100 bw.i = EXTRACT_32BITS(tptr+2); 2101 ND_PRINT((ndo, ": bandwidth: %.3f Mbps", 2102 bw.f*8/1000000)); 2103 break; 2104 case BGP_EXT_COM_VPN_ORIGIN: 2105 case BGP_EXT_COM_VPN_ORIGIN2: 2106 case BGP_EXT_COM_VPN_ORIGIN3: 2107 case BGP_EXT_COM_VPN_ORIGIN4: 2108 case BGP_EXT_COM_OSPF_RID: 2109 case BGP_EXT_COM_OSPF_RID2: 2110 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2))); 2111 break; 2112 case BGP_EXT_COM_OSPF_RTYPE: 2113 case BGP_EXT_COM_OSPF_RTYPE2: 2114 ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s", 2115 ipaddr_string(ndo, tptr+2), 2116 tok2str(bgp_extd_comm_ospf_rtype_values, 2117 "unknown (0x%02x)", 2118 *(tptr+6)), 2119 (*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "", 2120 ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "")); 2121 break; 2122 case BGP_EXT_COM_L2INFO: 2123 ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u", 2124 tok2str(l2vpn_encaps_values, 2125 "unknown encaps", 2126 *(tptr+2)), 2127 *(tptr+3), 2128 EXTRACT_16BITS(tptr+4))); 2129 break; 2130 case BGP_EXT_COM_SOURCE_AS: 2131 ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2))); 2132 break; 2133 default: 2134 ND_TCHECK2(*tptr,8); 2135 print_unknown_data(ndo, tptr, "\n\t ", 8); 2136 break; 2137 } 2138 tlen -=8; 2139 tptr +=8; 2140 } 2141 break; 2142 2143 case BGPTYPE_PMSI_TUNNEL: 2144 { 2145 uint8_t tunnel_type, flags; 2146 2147 ND_TCHECK2(tptr[0], 5); 2148 tunnel_type = *(tptr+1); 2149 flags = *tptr; 2150 tlen = len; 2151 2152 ND_PRINT((ndo, "\n\t Tunnel-type %s (%u), Flags [%s], MPLS Label %u", 2153 tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type), 2154 tunnel_type, 2155 bittok2str(bgp_pmsi_flag_values, "none", flags), 2156 EXTRACT_24BITS(tptr+2)>>4)); 2157 2158 tptr +=5; 2159 tlen -= 5; 2160 2161 switch (tunnel_type) { 2162 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */ 2163 case BGP_PMSI_TUNNEL_PIM_BIDIR: 2164 ND_TCHECK2(tptr[0], 8); 2165 ND_PRINT((ndo, "\n\t Sender %s, P-Group %s", 2166 ipaddr_string(ndo, tptr), 2167 ipaddr_string(ndo, tptr+4))); 2168 break; 2169 2170 case BGP_PMSI_TUNNEL_PIM_SSM: 2171 ND_TCHECK2(tptr[0], 8); 2172 ND_PRINT((ndo, "\n\t Root-Node %s, P-Group %s", 2173 ipaddr_string(ndo, tptr), 2174 ipaddr_string(ndo, tptr+4))); 2175 break; 2176 case BGP_PMSI_TUNNEL_INGRESS: 2177 ND_TCHECK2(tptr[0], 4); 2178 ND_PRINT((ndo, "\n\t Tunnel-Endpoint %s", 2179 ipaddr_string(ndo, tptr))); 2180 break; 2181 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */ 2182 case BGP_PMSI_TUNNEL_LDP_MP2MP: 2183 ND_TCHECK2(tptr[0], 8); 2184 ND_PRINT((ndo, "\n\t Root-Node %s, LSP-ID 0x%08x", 2185 ipaddr_string(ndo, tptr), 2186 EXTRACT_32BITS(tptr+4))); 2187 break; 2188 case BGP_PMSI_TUNNEL_RSVP_P2MP: 2189 ND_TCHECK2(tptr[0], 8); 2190 ND_PRINT((ndo, "\n\t Extended-Tunnel-ID %s, P2MP-ID 0x%08x", 2191 ipaddr_string(ndo, tptr), 2192 EXTRACT_32BITS(tptr+4))); 2193 break; 2194 default: 2195 if (ndo->ndo_vflag <= 1) { 2196 print_unknown_data(ndo, tptr, "\n\t ", tlen); 2197 } 2198 } 2199 break; 2200 } 2201 case BGPTYPE_AIGP: 2202 { 2203 uint8_t type; 2204 uint16_t length; 2205 2206 tlen = len; 2207 2208 while (tlen >= 3) { 2209 2210 ND_TCHECK2(tptr[0], 3); 2211 2212 type = *tptr; 2213 length = EXTRACT_16BITS(tptr+1); 2214 tptr += 3; 2215 tlen -= 3; 2216 2217 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u", 2218 tok2str(bgp_aigp_values, "Unknown", type), 2219 type, length)); 2220 2221 if (length < 3) 2222 goto trunc; 2223 length -= 3; 2224 2225 /* 2226 * Check if we can read the TLV data. 2227 */ 2228 ND_TCHECK2(tptr[3], length); 2229 2230 switch (type) { 2231 2232 case BGP_AIGP_TLV: 2233 if (length < 8) 2234 goto trunc; 2235 ND_PRINT((ndo, ", metric %" PRIu64, 2236 EXTRACT_64BITS(tptr))); 2237 break; 2238 2239 default: 2240 if (ndo->ndo_vflag <= 1) { 2241 print_unknown_data(ndo, tptr,"\n\t ", length); 2242 } 2243 } 2244 2245 tptr += length; 2246 tlen -= length; 2247 } 2248 break; 2249 } 2250 case BGPTYPE_ATTR_SET: 2251 ND_TCHECK2(tptr[0], 4); 2252 if (len < 4) 2253 goto trunc; 2254 ND_PRINT((ndo, "\n\t Origin AS: %s", 2255 as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)))); 2256 tptr+=4; 2257 len -=4; 2258 2259 while (len) { 2260 u_int aflags, alenlen, alen; 2261 2262 ND_TCHECK2(tptr[0], 2); 2263 if (len < 2) 2264 goto trunc; 2265 aflags = *tptr; 2266 atype = *(tptr + 1); 2267 tptr += 2; 2268 len -= 2; 2269 alenlen = bgp_attr_lenlen(aflags, tptr); 2270 ND_TCHECK2(tptr[0], alenlen); 2271 if (len < alenlen) 2272 goto trunc; 2273 alen = bgp_attr_len(aflags, tptr); 2274 tptr += alenlen; 2275 len -= alenlen; 2276 2277 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2278 tok2str(bgp_attr_values, 2279 "Unknown Attribute", atype), 2280 atype, 2281 alen)); 2282 2283 if (aflags) { 2284 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2285 aflags & 0x80 ? "O" : "", 2286 aflags & 0x40 ? "T" : "", 2287 aflags & 0x20 ? "P" : "", 2288 aflags & 0x10 ? "E" : "")); 2289 if (aflags & 0xf) 2290 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2291 ND_PRINT((ndo, "]: ")); 2292 } 2293 /* The protocol encoding per se allows ATTR_SET to be nested as many times 2294 * as the message can accommodate. This printer used to be able to recurse 2295 * into ATTR_SET contents until the stack exhaustion, but now there is a 2296 * limit on that (if live protocol exchange goes that many levels deep, 2297 * something is probably wrong anyway). Feel free to refine this value if 2298 * you can find the spec with respective normative text. 2299 */ 2300 if (attr_set_level == 10) 2301 ND_PRINT((ndo, "(too many nested levels, not recursing)")); 2302 else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1)) 2303 return 0; 2304 tptr += alen; 2305 len -= alen; 2306 } 2307 break; 2308 2309 case BGPTYPE_LARGE_COMMUNITY: 2310 if (len == 0 || len % 12) { 2311 ND_PRINT((ndo, "invalid len")); 2312 break; 2313 } 2314 ND_PRINT((ndo, "\n\t ")); 2315 while (len > 0) { 2316 ND_TCHECK2(*tptr, 12); 2317 ND_PRINT((ndo, "%u:%u:%u%s", 2318 EXTRACT_32BITS(tptr), 2319 EXTRACT_32BITS(tptr + 4), 2320 EXTRACT_32BITS(tptr + 8), 2321 (len > 12) ? ", " : "")); 2322 tptr += 12; 2323 len -= 12; 2324 } 2325 break; 2326 default: 2327 ND_TCHECK2(*pptr,len); 2328 ND_PRINT((ndo, "\n\t no Attribute %u decoder", atype)); /* we have no decoder for the attribute */ 2329 if (ndo->ndo_vflag <= 1) 2330 print_unknown_data(ndo, pptr, "\n\t ", len); 2331 break; 2332 } 2333 if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/ 2334 ND_TCHECK2(*pptr,len); 2335 print_unknown_data(ndo, pptr, "\n\t ", len); 2336 } 2337 return 1; 2338 2339 trunc: 2340 return 0; 2341 } 2342 2343 static void 2344 bgp_capabilities_print(netdissect_options *ndo, 2345 const u_char *opt, int caps_len) 2346 { 2347 int cap_type, cap_len, tcap_len, cap_offset; 2348 int i = 0; 2349 2350 while (i < caps_len) { 2351 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE); 2352 cap_type=opt[i]; 2353 cap_len=opt[i+1]; 2354 tcap_len=cap_len; 2355 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2356 tok2str(bgp_capcode_values, "Unknown", 2357 cap_type), 2358 cap_type, 2359 cap_len)); 2360 ND_TCHECK2(opt[i+2], cap_len); 2361 switch (cap_type) { 2362 case BGP_CAPCODE_MP: 2363 /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */ 2364 ND_TCHECK_8BITS(opt + i + 5); 2365 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)", 2366 tok2str(af_values, "Unknown", 2367 EXTRACT_16BITS(opt+i+2)), 2368 EXTRACT_16BITS(opt+i+2), 2369 tok2str(bgp_safi_values, "Unknown", 2370 opt[i+5]), 2371 opt[i+5])); 2372 break; 2373 case BGP_CAPCODE_RESTART: 2374 /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */ 2375 ND_TCHECK_16BITS(opt + i + 2); 2376 ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us", 2377 ((opt[i+2])&0x80) ? "R" : "none", 2378 EXTRACT_16BITS(opt+i+2)&0xfff)); 2379 tcap_len-=2; 2380 cap_offset=4; 2381 while(tcap_len>=4) { 2382 ND_TCHECK_8BITS(opt + i + cap_offset + 3); 2383 ND_PRINT((ndo, "\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s", 2384 tok2str(af_values,"Unknown", 2385 EXTRACT_16BITS(opt+i+cap_offset)), 2386 EXTRACT_16BITS(opt+i+cap_offset), 2387 tok2str(bgp_safi_values,"Unknown", 2388 opt[i+cap_offset+2]), 2389 opt[i+cap_offset+2], 2390 ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" )); 2391 tcap_len-=4; 2392 cap_offset+=4; 2393 } 2394 break; 2395 case BGP_CAPCODE_RR: 2396 case BGP_CAPCODE_RR_CISCO: 2397 break; 2398 case BGP_CAPCODE_AS_NEW: 2399 2400 /* 2401 * Extract the 4 byte AS number encoded. 2402 */ 2403 if (cap_len == 4) { 2404 ND_PRINT((ndo, "\n\t\t 4 Byte AS %s", 2405 as_printf(ndo, astostr, sizeof(astostr), 2406 EXTRACT_32BITS(opt + i + 2)))); 2407 } 2408 break; 2409 case BGP_CAPCODE_ADD_PATH: 2410 cap_offset=2; 2411 if (tcap_len == 0) { 2412 ND_PRINT((ndo, " (bogus)")); /* length */ 2413 break; 2414 } 2415 while (tcap_len > 0) { 2416 if (tcap_len < 4) { 2417 ND_PRINT((ndo, "\n\t\t(invalid)")); 2418 break; 2419 } 2420 ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s", 2421 tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)), 2422 EXTRACT_16BITS(opt+i+cap_offset), 2423 tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]), 2424 opt[i+cap_offset+2], 2425 tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3]) 2426 )); 2427 tcap_len-=4; 2428 cap_offset+=4; 2429 } 2430 break; 2431 default: 2432 ND_PRINT((ndo, "\n\t\tno decoder for Capability %u", 2433 cap_type)); 2434 if (ndo->ndo_vflag <= 1) 2435 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2436 break; 2437 } 2438 if (ndo->ndo_vflag > 1 && cap_len > 0) { 2439 print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len); 2440 } 2441 i += BGP_CAP_HEADER_SIZE + cap_len; 2442 } 2443 return; 2444 2445 trunc: 2446 ND_PRINT((ndo, "%s", tstr)); 2447 } 2448 2449 static void 2450 bgp_open_print(netdissect_options *ndo, 2451 const u_char *dat, int length) 2452 { 2453 struct bgp_open bgpo; 2454 struct bgp_opt bgpopt; 2455 const u_char *opt; 2456 int i; 2457 2458 ND_TCHECK2(dat[0], BGP_OPEN_SIZE); 2459 memcpy(&bgpo, dat, BGP_OPEN_SIZE); 2460 2461 ND_PRINT((ndo, "\n\t Version %d, ", bgpo.bgpo_version)); 2462 ND_PRINT((ndo, "my AS %s, ", 2463 as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas)))); 2464 ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime))); 2465 ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id))); 2466 ND_PRINT((ndo, "\n\t Optional parameters, length: %u", bgpo.bgpo_optlen)); 2467 2468 /* some little sanity checking */ 2469 if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE) 2470 return; 2471 2472 /* ugly! */ 2473 opt = &((const struct bgp_open *)dat)->bgpo_optlen; 2474 opt++; 2475 2476 i = 0; 2477 while (i < bgpo.bgpo_optlen) { 2478 ND_TCHECK2(opt[i], BGP_OPT_SIZE); 2479 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE); 2480 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) { 2481 ND_PRINT((ndo, "\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len)); 2482 break; 2483 } 2484 2485 ND_PRINT((ndo, "\n\t Option %s (%u), length: %u", 2486 tok2str(bgp_opt_values,"Unknown", 2487 bgpopt.bgpopt_type), 2488 bgpopt.bgpopt_type, 2489 bgpopt.bgpopt_len)); 2490 2491 /* now let's decode the options we know*/ 2492 switch(bgpopt.bgpopt_type) { 2493 2494 case BGP_OPT_CAP: 2495 bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE], 2496 bgpopt.bgpopt_len); 2497 break; 2498 2499 case BGP_OPT_AUTH: 2500 default: 2501 ND_PRINT((ndo, "\n\t no decoder for option %u", 2502 bgpopt.bgpopt_type)); 2503 break; 2504 } 2505 i += BGP_OPT_SIZE + bgpopt.bgpopt_len; 2506 } 2507 return; 2508 trunc: 2509 ND_PRINT((ndo, "%s", tstr)); 2510 } 2511 2512 static void 2513 bgp_update_print(netdissect_options *ndo, 2514 const u_char *dat, int length) 2515 { 2516 struct bgp bgp; 2517 const u_char *p; 2518 int withdrawn_routes_len; 2519 int len; 2520 int i; 2521 2522 ND_TCHECK2(dat[0], BGP_SIZE); 2523 if (length < BGP_SIZE) 2524 goto trunc; 2525 memcpy(&bgp, dat, BGP_SIZE); 2526 p = dat + BGP_SIZE; /*XXX*/ 2527 length -= BGP_SIZE; 2528 2529 /* Unfeasible routes */ 2530 ND_TCHECK2(p[0], 2); 2531 if (length < 2) 2532 goto trunc; 2533 withdrawn_routes_len = EXTRACT_16BITS(p); 2534 p += 2; 2535 length -= 2; 2536 if (withdrawn_routes_len) { 2537 /* 2538 * Without keeping state from the original NLRI message, 2539 * it's not possible to tell if this a v4 or v6 route, 2540 * so only try to decode it if we're not v6 enabled. 2541 */ 2542 ND_TCHECK2(p[0], withdrawn_routes_len); 2543 if (length < withdrawn_routes_len) 2544 goto trunc; 2545 ND_PRINT((ndo, "\n\t Withdrawn routes: %d bytes", withdrawn_routes_len)); 2546 p += withdrawn_routes_len; 2547 length -= withdrawn_routes_len; 2548 } 2549 2550 ND_TCHECK2(p[0], 2); 2551 if (length < 2) 2552 goto trunc; 2553 len = EXTRACT_16BITS(p); 2554 p += 2; 2555 length -= 2; 2556 2557 if (withdrawn_routes_len == 0 && len == 0 && length == 0) { 2558 /* No withdrawn routes, no path attributes, no NLRI */ 2559 ND_PRINT((ndo, "\n\t End-of-Rib Marker (empty NLRI)")); 2560 return; 2561 } 2562 2563 if (len) { 2564 /* do something more useful!*/ 2565 while (len) { 2566 int aflags, atype, alenlen, alen; 2567 2568 ND_TCHECK2(p[0], 2); 2569 if (len < 2) 2570 goto trunc; 2571 if (length < 2) 2572 goto trunc; 2573 aflags = *p; 2574 atype = *(p + 1); 2575 p += 2; 2576 len -= 2; 2577 length -= 2; 2578 alenlen = bgp_attr_lenlen(aflags, p); 2579 ND_TCHECK2(p[0], alenlen); 2580 if (len < alenlen) 2581 goto trunc; 2582 if (length < alenlen) 2583 goto trunc; 2584 alen = bgp_attr_len(aflags, p); 2585 p += alenlen; 2586 len -= alenlen; 2587 length -= alenlen; 2588 2589 ND_PRINT((ndo, "\n\t %s (%u), length: %u", 2590 tok2str(bgp_attr_values, "Unknown Attribute", 2591 atype), 2592 atype, 2593 alen)); 2594 2595 if (aflags) { 2596 ND_PRINT((ndo, ", Flags [%s%s%s%s", 2597 aflags & 0x80 ? "O" : "", 2598 aflags & 0x40 ? "T" : "", 2599 aflags & 0x20 ? "P" : "", 2600 aflags & 0x10 ? "E" : "")); 2601 if (aflags & 0xf) 2602 ND_PRINT((ndo, "+%x", aflags & 0xf)); 2603 ND_PRINT((ndo, "]: ")); 2604 } 2605 if (len < alen) 2606 goto trunc; 2607 if (length < alen) 2608 goto trunc; 2609 if (!bgp_attr_print(ndo, atype, p, alen, 0)) 2610 goto trunc; 2611 p += alen; 2612 len -= alen; 2613 length -= alen; 2614 } 2615 } 2616 2617 if (length) { 2618 /* 2619 * XXX - what if they're using the "Advertisement of 2620 * Multiple Paths in BGP" feature: 2621 * 2622 * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/ 2623 * 2624 * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06 2625 */ 2626 ND_PRINT((ndo, "\n\t Updated routes:")); 2627 while (length) { 2628 char buf[MAXHOSTNAMELEN + 100]; 2629 i = decode_prefix4(ndo, p, length, buf, sizeof(buf)); 2630 if (i == -1) { 2631 ND_PRINT((ndo, "\n\t (illegal prefix length)")); 2632 break; 2633 } else if (i == -2) 2634 goto trunc; 2635 else if (i == -3) 2636 goto trunc; /* bytes left, but not enough */ 2637 else { 2638 ND_PRINT((ndo, "\n\t %s", buf)); 2639 p += i; 2640 length -= i; 2641 } 2642 } 2643 } 2644 return; 2645 trunc: 2646 ND_PRINT((ndo, "%s", tstr)); 2647 } 2648 2649 static void 2650 bgp_notification_print(netdissect_options *ndo, 2651 const u_char *dat, int length) 2652 { 2653 struct bgp_notification bgpn; 2654 const u_char *tptr; 2655 2656 ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE); 2657 memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE); 2658 2659 /* some little sanity checking */ 2660 if (length<BGP_NOTIFICATION_SIZE) 2661 return; 2662 2663 ND_PRINT((ndo, ", %s (%u)", 2664 tok2str(bgp_notify_major_values, "Unknown Error", 2665 bgpn.bgpn_major), 2666 bgpn.bgpn_major)); 2667 2668 switch (bgpn.bgpn_major) { 2669 2670 case BGP_NOTIFY_MAJOR_MSG: 2671 ND_PRINT((ndo, ", subcode %s (%u)", 2672 tok2str(bgp_notify_minor_msg_values, "Unknown", 2673 bgpn.bgpn_minor), 2674 bgpn.bgpn_minor)); 2675 break; 2676 case BGP_NOTIFY_MAJOR_OPEN: 2677 ND_PRINT((ndo, ", subcode %s (%u)", 2678 tok2str(bgp_notify_minor_open_values, "Unknown", 2679 bgpn.bgpn_minor), 2680 bgpn.bgpn_minor)); 2681 break; 2682 case BGP_NOTIFY_MAJOR_UPDATE: 2683 ND_PRINT((ndo, ", subcode %s (%u)", 2684 tok2str(bgp_notify_minor_update_values, "Unknown", 2685 bgpn.bgpn_minor), 2686 bgpn.bgpn_minor)); 2687 break; 2688 case BGP_NOTIFY_MAJOR_FSM: 2689 ND_PRINT((ndo, " subcode %s (%u)", 2690 tok2str(bgp_notify_minor_fsm_values, "Unknown", 2691 bgpn.bgpn_minor), 2692 bgpn.bgpn_minor)); 2693 break; 2694 case BGP_NOTIFY_MAJOR_CAP: 2695 ND_PRINT((ndo, " subcode %s (%u)", 2696 tok2str(bgp_notify_minor_cap_values, "Unknown", 2697 bgpn.bgpn_minor), 2698 bgpn.bgpn_minor)); 2699 break; 2700 case BGP_NOTIFY_MAJOR_CEASE: 2701 ND_PRINT((ndo, ", subcode %s (%u)", 2702 tok2str(bgp_notify_minor_cease_values, "Unknown", 2703 bgpn.bgpn_minor), 2704 bgpn.bgpn_minor)); 2705 2706 /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes 2707 * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES 2708 */ 2709 if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) { 2710 tptr = dat + BGP_NOTIFICATION_SIZE; 2711 ND_TCHECK2(*tptr, 7); 2712 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u", 2713 tok2str(af_values, "Unknown", 2714 EXTRACT_16BITS(tptr)), 2715 EXTRACT_16BITS(tptr), 2716 tok2str(bgp_safi_values, "Unknown", *(tptr+2)), 2717 *(tptr+2), 2718 EXTRACT_32BITS(tptr+3))); 2719 } 2720 break; 2721 default: 2722 break; 2723 } 2724 2725 return; 2726 trunc: 2727 ND_PRINT((ndo, "%s", tstr)); 2728 } 2729 2730 static void 2731 bgp_route_refresh_print(netdissect_options *ndo, 2732 const u_char *pptr, int len) 2733 { 2734 const struct bgp_route_refresh *bgp_route_refresh_header; 2735 2736 ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE); 2737 2738 /* some little sanity checking */ 2739 if (len<BGP_ROUTE_REFRESH_SIZE) 2740 return; 2741 2742 bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr; 2743 2744 ND_PRINT((ndo, "\n\t AFI %s (%u), SAFI %s (%u)", 2745 tok2str(af_values,"Unknown", 2746 /* this stinks but the compiler pads the structure 2747 * weird */ 2748 EXTRACT_16BITS(&bgp_route_refresh_header->afi)), 2749 EXTRACT_16BITS(&bgp_route_refresh_header->afi), 2750 tok2str(bgp_safi_values,"Unknown", 2751 bgp_route_refresh_header->safi), 2752 bgp_route_refresh_header->safi)); 2753 2754 if (ndo->ndo_vflag > 1) { 2755 ND_TCHECK2(*pptr, len); 2756 print_unknown_data(ndo, pptr, "\n\t ", len); 2757 } 2758 2759 return; 2760 trunc: 2761 ND_PRINT((ndo, "%s", tstr)); 2762 } 2763 2764 static int 2765 bgp_header_print(netdissect_options *ndo, 2766 const u_char *dat, int length) 2767 { 2768 struct bgp bgp; 2769 2770 ND_TCHECK2(dat[0], BGP_SIZE); 2771 memcpy(&bgp, dat, BGP_SIZE); 2772 ND_PRINT((ndo, "\n\t%s Message (%u), length: %u", 2773 tok2str(bgp_msg_values, "Unknown", bgp.bgp_type), 2774 bgp.bgp_type, 2775 length)); 2776 2777 switch (bgp.bgp_type) { 2778 case BGP_OPEN: 2779 bgp_open_print(ndo, dat, length); 2780 break; 2781 case BGP_UPDATE: 2782 bgp_update_print(ndo, dat, length); 2783 break; 2784 case BGP_NOTIFICATION: 2785 bgp_notification_print(ndo, dat, length); 2786 break; 2787 case BGP_KEEPALIVE: 2788 break; 2789 case BGP_ROUTE_REFRESH: 2790 bgp_route_refresh_print(ndo, dat, length); 2791 break; 2792 default: 2793 /* we have no decoder for the BGP message */ 2794 ND_TCHECK2(*dat, length); 2795 ND_PRINT((ndo, "\n\t no Message %u decoder", bgp.bgp_type)); 2796 print_unknown_data(ndo, dat, "\n\t ", length); 2797 break; 2798 } 2799 return 1; 2800 trunc: 2801 ND_PRINT((ndo, "%s", tstr)); 2802 return 0; 2803 } 2804 2805 void 2806 bgp_print(netdissect_options *ndo, 2807 const u_char *dat, int length) 2808 { 2809 const u_char *p; 2810 const u_char *ep; 2811 const u_char *start; 2812 const u_char marker[] = { 2813 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2814 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 2815 }; 2816 struct bgp bgp; 2817 uint16_t hlen; 2818 2819 ep = dat + length; 2820 if (ndo->ndo_snapend < dat + length) 2821 ep = ndo->ndo_snapend; 2822 2823 ND_PRINT((ndo, ": BGP")); 2824 2825 if (ndo->ndo_vflag < 1) /* lets be less chatty */ 2826 return; 2827 2828 p = dat; 2829 start = p; 2830 while (p < ep) { 2831 if (!ND_TTEST2(p[0], 1)) 2832 break; 2833 if (p[0] != 0xff) { 2834 p++; 2835 continue; 2836 } 2837 2838 if (!ND_TTEST2(p[0], sizeof(marker))) 2839 break; 2840 if (memcmp(p, marker, sizeof(marker)) != 0) { 2841 p++; 2842 continue; 2843 } 2844 2845 /* found BGP header */ 2846 ND_TCHECK2(p[0], BGP_SIZE); /*XXX*/ 2847 memcpy(&bgp, p, BGP_SIZE); 2848 2849 if (start != p) 2850 ND_PRINT((ndo, " %s", tstr)); 2851 2852 hlen = ntohs(bgp.bgp_len); 2853 if (hlen < BGP_SIZE) { 2854 ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen, 2855 BGP_SIZE)); 2856 break; 2857 } 2858 2859 if (ND_TTEST2(p[0], hlen)) { 2860 if (!bgp_header_print(ndo, p, hlen)) 2861 return; 2862 p += hlen; 2863 start = p; 2864 } else { 2865 ND_PRINT((ndo, "\n[|BGP %s]", 2866 tok2str(bgp_msg_values, 2867 "Unknown Message Type", 2868 bgp.bgp_type))); 2869 break; 2870 } 2871 } 2872 2873 return; 2874 2875 trunc: 2876 ND_PRINT((ndo, "%s", tstr)); 2877 } 2878 2879 /* 2880 * Local Variables: 2881 * c-style: whitesmith 2882 * c-basic-offset: 4 2883 * End: 2884 */ 2885