contrib/tcpdump/print-bgp.c

   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 /* \summary: Border Gateway Protocol (BGP) printer */
  34
  35 #ifdef HAVE_CONFIG_H
  36 #include "config.h"
  37 #endif
  38
  39 #include <netdissect-stdinc.h>
  40
  41 #include <stdio.h>
  42 #include <string.h>
  43
  44 #include "netdissect.h"
  45 #include "addrtoname.h"
  46 #include "extract.h"
  47 #include "af.h"
  48 #include "l2vpn.h"
  49
  50 static const char tstr[] = "[|BGP]";
  51
  52 struct bgp {
  53         uint8_t bgp_marker[16];
  54         uint16_t bgp_len;
  55         uint8_t bgp_type;
  56 };
  57 #define BGP_SIZE                19      /* unaligned */
  58
  59 #define BGP_OPEN                1
  60 #define BGP_UPDATE              2
  61 #define BGP_NOTIFICATION        3
  62 #define BGP_KEEPALIVE           4
  63 #define BGP_ROUTE_REFRESH       5
  64
  65 static const struct tok bgp_msg_values[] = {
  66     { BGP_OPEN,                 "Open"},
  67     { BGP_UPDATE,               "Update"},
  68     { BGP_NOTIFICATION,         "Notification"},
  69     { BGP_KEEPALIVE,            "Keepalive"},
  70     { BGP_ROUTE_REFRESH,        "Route Refresh"},
  71     { 0, NULL}
  72 };
  73
  74 struct bgp_open {
  75         uint8_t bgpo_marker[16];
  76         uint16_t bgpo_len;
  77         uint8_t bgpo_type;
  78         uint8_t bgpo_version;
  79         uint16_t bgpo_myas;
  80         uint16_t bgpo_holdtime;
  81         uint32_t bgpo_id;
  82         uint8_t bgpo_optlen;
  83         /* options should follow */
  84 };
  85 #define BGP_OPEN_SIZE           29      /* unaligned */
  86
  87 struct bgp_opt {
  88         uint8_t bgpopt_type;
  89         uint8_t bgpopt_len;
  90         /* variable length */
  91 };
  92 #define BGP_OPT_SIZE            2       /* some compilers may pad to 4 bytes */
  93 #define BGP_CAP_HEADER_SIZE     2       /* some compilers may pad to 4 bytes */
  94
  95 struct bgp_notification {
  96         uint8_t bgpn_marker[16];
  97         uint16_t bgpn_len;
  98         uint8_t bgpn_type;
  99         uint8_t bgpn_major;
 100         uint8_t bgpn_minor;
 101 };
 102 #define BGP_NOTIFICATION_SIZE           21      /* unaligned */
 103
 104 struct bgp_route_refresh {
 105     uint8_t  bgp_marker[16];
 106     uint16_t len;
 107     uint8_t  type;
 108     uint8_t  afi[2]; /* the compiler messes this structure up               */
 109     uint8_t  res;    /* when doing misaligned sequences of int8 and int16   */
 110     uint8_t  safi;   /* afi should be int16 - so we have to access it using */
 111 };                    /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh)      */
 112 #define BGP_ROUTE_REFRESH_SIZE          23
 113
 114 #define bgp_attr_lenlen(flags, p) \
 115         (((flags) & 0x10) ? 2 : 1)
 116 #define bgp_attr_len(flags, p) \
 117         (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p))
 118
 119 #define BGPTYPE_ORIGIN                  1
 120 #define BGPTYPE_AS_PATH                 2
 121 #define BGPTYPE_NEXT_HOP                3
 122 #define BGPTYPE_MULTI_EXIT_DISC         4
 123 #define BGPTYPE_LOCAL_PREF              5
 124 #define BGPTYPE_ATOMIC_AGGREGATE        6
 125 #define BGPTYPE_AGGREGATOR              7
 126 #define BGPTYPE_COMMUNITIES             8       /* RFC1997 */
 127 #define BGPTYPE_ORIGINATOR_ID           9       /* RFC4456 */
 128 #define BGPTYPE_CLUSTER_LIST            10      /* RFC4456 */
 129 #define BGPTYPE_DPA                     11      /* deprecated, draft-ietf-idr-bgp-dpa */
 130 #define BGPTYPE_ADVERTISERS             12      /* deprecated RFC1863 */
 131 #define BGPTYPE_RCID_PATH               13      /* deprecated RFC1863 */
 132 #define BGPTYPE_MP_REACH_NLRI           14      /* RFC4760 */
 133 #define BGPTYPE_MP_UNREACH_NLRI         15      /* RFC4760 */
 134 #define BGPTYPE_EXTD_COMMUNITIES        16      /* RFC4360 */
 135 #define BGPTYPE_AS4_PATH                17      /* RFC6793 */
 136 #define BGPTYPE_AGGREGATOR4             18      /* RFC6793 */
 137 #define BGPTYPE_PMSI_TUNNEL             22      /* RFC6514 */
 138 #define BGPTYPE_TUNNEL_ENCAP            23      /* RFC5512 */
 139 #define BGPTYPE_TRAFFIC_ENG             24      /* RFC5543 */
 140 #define BGPTYPE_IPV6_EXTD_COMMUNITIES   25      /* RFC5701 */
 141 #define BGPTYPE_AIGP                    26      /* RFC7311 */
 142 #define BGPTYPE_PE_DISTINGUISHER_LABEL  27      /* RFC6514 */
 143 #define BGPTYPE_ENTROPY_LABEL           28      /* RFC6790 */
 144 #define BGPTYPE_LARGE_COMMUNITY         32      /* draft-ietf-idr-large-community-05 */
 145 #define BGPTYPE_ATTR_SET               128      /* RFC6368 */
 146
 147 #define BGP_MP_NLRI_MINSIZE              3       /* End of RIB Marker detection */
 148
 149 static const struct tok bgp_attr_values[] = {
 150     { BGPTYPE_ORIGIN,           "Origin"},
 151     { BGPTYPE_AS_PATH,          "AS Path"},
 152     { BGPTYPE_AS4_PATH,         "AS4 Path"},
 153     { BGPTYPE_NEXT_HOP,         "Next Hop"},
 154     { BGPTYPE_MULTI_EXIT_DISC,  "Multi Exit Discriminator"},
 155     { BGPTYPE_LOCAL_PREF,       "Local Preference"},
 156     { BGPTYPE_ATOMIC_AGGREGATE, "Atomic Aggregate"},
 157     { BGPTYPE_AGGREGATOR,       "Aggregator"},
 158     { BGPTYPE_AGGREGATOR4,      "Aggregator4"},
 159     { BGPTYPE_COMMUNITIES,      "Community"},
 160     { BGPTYPE_ORIGINATOR_ID,    "Originator ID"},
 161     { BGPTYPE_CLUSTER_LIST,     "Cluster List"},
 162     { BGPTYPE_DPA,              "DPA"},
 163     { BGPTYPE_ADVERTISERS,      "Advertisers"},
 164     { BGPTYPE_RCID_PATH,        "RCID Path / Cluster ID"},
 165     { BGPTYPE_MP_REACH_NLRI,    "Multi-Protocol Reach NLRI"},
 166     { BGPTYPE_MP_UNREACH_NLRI,  "Multi-Protocol Unreach NLRI"},
 167     { BGPTYPE_EXTD_COMMUNITIES, "Extended Community"},
 168     { BGPTYPE_PMSI_TUNNEL,      "PMSI Tunnel"},
 169     { BGPTYPE_TUNNEL_ENCAP,     "Tunnel Encapsulation"},
 170     { BGPTYPE_TRAFFIC_ENG,      "Traffic Engineering"},
 171     { BGPTYPE_IPV6_EXTD_COMMUNITIES, "IPv6 Extended Community"},
 172     { BGPTYPE_AIGP,             "Accumulated IGP Metric"},
 173     { BGPTYPE_PE_DISTINGUISHER_LABEL, "PE Distinguisher Label"},
 174     { BGPTYPE_ENTROPY_LABEL,    "Entropy Label"},
 175     { BGPTYPE_LARGE_COMMUNITY,  "Large Community"},
 176     { BGPTYPE_ATTR_SET,         "Attribute Set"},
 177     { 255,                      "Reserved for development"},
 178     { 0, NULL}
 179 };
 180
 181 #define BGP_AS_SET             1
 182 #define BGP_AS_SEQUENCE        2
 183 #define BGP_CONFED_AS_SEQUENCE 3 /* draft-ietf-idr-rfc3065bis-01 */
 184 #define BGP_CONFED_AS_SET      4 /* draft-ietf-idr-rfc3065bis-01  */
 185
 186 #define BGP_AS_SEG_TYPE_MIN    BGP_AS_SET
 187 #define BGP_AS_SEG_TYPE_MAX    BGP_CONFED_AS_SET
 188
 189 static const struct tok bgp_as_path_segment_open_values[] = {
 190     { BGP_AS_SEQUENCE,         ""},
 191     { BGP_AS_SET,              "{ "},
 192     { BGP_CONFED_AS_SEQUENCE,  "( "},
 193     { BGP_CONFED_AS_SET,       "({ "},
 194     { 0, NULL}
 195 };
 196
 197 static const struct tok bgp_as_path_segment_close_values[] = {
 198     { BGP_AS_SEQUENCE,         ""},
 199     { BGP_AS_SET,              "}"},
 200     { BGP_CONFED_AS_SEQUENCE,  ")"},
 201     { BGP_CONFED_AS_SET,       "})"},
 202     { 0, NULL}
 203 };
 204
 205 #define BGP_OPT_AUTH                    1
 206 #define BGP_OPT_CAP                     2
 207
 208 static const struct tok bgp_opt_values[] = {
 209     { BGP_OPT_AUTH,             "Authentication Information"},
 210     { BGP_OPT_CAP,              "Capabilities Advertisement"},
 211     { 0, NULL}
 212 };
 213
 214 #define BGP_CAPCODE_MP                  1 /* RFC2858 */
 215 #define BGP_CAPCODE_RR                  2 /* RFC2918 */
 216 #define BGP_CAPCODE_ORF                 3 /* RFC5291 */
 217 #define BGP_CAPCODE_MR                  4 /* RFC3107 */
 218 #define BGP_CAPCODE_EXT_NH              5 /* RFC5549 */
 219 #define BGP_CAPCODE_RESTART            64 /* RFC4724  */
 220 #define BGP_CAPCODE_AS_NEW             65 /* RFC6793 */
 221 #define BGP_CAPCODE_DYN_CAP            67 /* draft-ietf-idr-dynamic-cap */
 222 #define BGP_CAPCODE_MULTISESS          68 /* draft-ietf-idr-bgp-multisession */
 223 #define BGP_CAPCODE_ADD_PATH           69 /* RFC7911 */
 224 #define BGP_CAPCODE_ENH_RR             70 /* draft-keyur-bgp-enhanced-route-refresh */
 225 #define BGP_CAPCODE_RR_CISCO          128
 226
 227 static const struct tok bgp_capcode_values[] = {
 228     { BGP_CAPCODE_MP,           "Multiprotocol Extensions"},
 229     { BGP_CAPCODE_RR,           "Route Refresh"},
 230     { BGP_CAPCODE_ORF,          "Cooperative Route Filtering"},
 231     { BGP_CAPCODE_MR,           "Multiple Routes to a Destination"},
 232     { BGP_CAPCODE_EXT_NH,       "Extended Next Hop Encoding"},
 233     { BGP_CAPCODE_RESTART,      "Graceful Restart"},
 234     { BGP_CAPCODE_AS_NEW,       "32-Bit AS Number"},
 235     { BGP_CAPCODE_DYN_CAP,      "Dynamic Capability"},
 236     { BGP_CAPCODE_MULTISESS,    "Multisession BGP"},
 237     { BGP_CAPCODE_ADD_PATH,     "Multiple Paths"},
 238     { BGP_CAPCODE_ENH_RR,       "Enhanced Route Refresh"},
 239     { BGP_CAPCODE_RR_CISCO,     "Route Refresh (Cisco)"},
 240     { 0, NULL}
 241 };
 242
 243 #define BGP_NOTIFY_MAJOR_MSG            1
 244 #define BGP_NOTIFY_MAJOR_OPEN           2
 245 #define BGP_NOTIFY_MAJOR_UPDATE         3
 246 #define BGP_NOTIFY_MAJOR_HOLDTIME       4
 247 #define BGP_NOTIFY_MAJOR_FSM            5
 248 #define BGP_NOTIFY_MAJOR_CEASE          6
 249 #define BGP_NOTIFY_MAJOR_CAP            7
 250
 251 static const struct tok bgp_notify_major_values[] = {
 252     { BGP_NOTIFY_MAJOR_MSG,     "Message Header Error"},
 253     { BGP_NOTIFY_MAJOR_OPEN,    "OPEN Message Error"},
 254     { BGP_NOTIFY_MAJOR_UPDATE,  "UPDATE Message Error"},
 255     { BGP_NOTIFY_MAJOR_HOLDTIME,"Hold Timer Expired"},
 256     { BGP_NOTIFY_MAJOR_FSM,     "Finite State Machine Error"},
 257     { BGP_NOTIFY_MAJOR_CEASE,   "Cease"},
 258     { BGP_NOTIFY_MAJOR_CAP,     "Capability Message Error"},
 259     { 0, NULL}
 260 };
 261
 262 /* draft-ietf-idr-cease-subcode-02 */
 263 #define BGP_NOTIFY_MINOR_CEASE_MAXPRFX  1
 264 static const struct tok bgp_notify_minor_cease_values[] = {
 265     { BGP_NOTIFY_MINOR_CEASE_MAXPRFX, "Maximum Number of Prefixes Reached"},
 266     { 2,                        "Administratively Shutdown"},
 267     { 3,                        "Peer Unconfigured"},
 268     { 4,                        "Administratively Reset"},
 269     { 5,                        "Connection Rejected"},
 270     { 6,                        "Other Configuration Change"},
 271     { 7,                        "Connection Collision Resolution"},
 272     { 0, NULL}
 273 };
 274
 275 static const struct tok bgp_notify_minor_msg_values[] = {
 276     { 1,                        "Connection Not Synchronized"},
 277     { 2,                        "Bad Message Length"},
 278     { 3,                        "Bad Message Type"},
 279     { 0, NULL}
 280 };
 281
 282 static const struct tok bgp_notify_minor_open_values[] = {
 283     { 1,                        "Unsupported Version Number"},
 284     { 2,                        "Bad Peer AS"},
 285     { 3,                        "Bad BGP Identifier"},
 286     { 4,                        "Unsupported Optional Parameter"},
 287     { 5,                        "Authentication Failure"},
 288     { 6,                        "Unacceptable Hold Time"},
 289     { 7,                        "Capability Message Error"},
 290     { 0, NULL}
 291 };
 292
 293 static const struct tok bgp_notify_minor_update_values[] = {
 294     { 1,                        "Malformed Attribute List"},
 295     { 2,                        "Unrecognized Well-known Attribute"},
 296     { 3,                        "Missing Well-known Attribute"},
 297     { 4,                        "Attribute Flags Error"},
 298     { 5,                        "Attribute Length Error"},
 299     { 6,                        "Invalid ORIGIN Attribute"},
 300     { 7,                        "AS Routing Loop"},
 301     { 8,                        "Invalid NEXT_HOP Attribute"},
 302     { 9,                        "Optional Attribute Error"},
 303     { 10,                       "Invalid Network Field"},
 304     { 11,                       "Malformed AS_PATH"},
 305     { 0, NULL}
 306 };
 307
 308 static const struct tok bgp_notify_minor_fsm_values[] = {
 309     { 1,                        "In OpenSent State"},
 310     { 2,                        "In OpenConfirm State"},
 311     { 3,                        "In Established State"},
 312     { 0, NULL }
 313 };
 314
 315 static const struct tok bgp_notify_minor_cap_values[] = {
 316     { 1,                        "Invalid Action Value" },
 317     { 2,                        "Invalid Capability Length" },
 318     { 3,                        "Malformed Capability Value" },
 319     { 4,                        "Unsupported Capability Code" },
 320     { 0, NULL }
 321 };
 322
 323 static const struct tok bgp_origin_values[] = {
 324     { 0,                        "IGP"},
 325     { 1,                        "EGP"},
 326     { 2,                        "Incomplete"},
 327     { 0, NULL}
 328 };
 329
 330 #define BGP_PMSI_TUNNEL_RSVP_P2MP 1
 331 #define BGP_PMSI_TUNNEL_LDP_P2MP  2
 332 #define BGP_PMSI_TUNNEL_PIM_SSM   3
 333 #define BGP_PMSI_TUNNEL_PIM_SM    4
 334 #define BGP_PMSI_TUNNEL_PIM_BIDIR 5
 335 #define BGP_PMSI_TUNNEL_INGRESS   6
 336 #define BGP_PMSI_TUNNEL_LDP_MP2MP 7
 337
 338 static const struct tok bgp_pmsi_tunnel_values[] = {
 339     { BGP_PMSI_TUNNEL_RSVP_P2MP, "RSVP-TE P2MP LSP"},
 340     { BGP_PMSI_TUNNEL_LDP_P2MP, "LDP P2MP LSP"},
 341     { BGP_PMSI_TUNNEL_PIM_SSM, "PIM-SSM Tree"},
 342     { BGP_PMSI_TUNNEL_PIM_SM, "PIM-SM Tree"},
 343     { BGP_PMSI_TUNNEL_PIM_BIDIR, "PIM-Bidir Tree"},
 344     { BGP_PMSI_TUNNEL_INGRESS, "Ingress Replication"},
 345     { BGP_PMSI_TUNNEL_LDP_MP2MP, "LDP MP2MP LSP"},
 346     { 0, NULL}
 347 };
 348
 349 static const struct tok bgp_pmsi_flag_values[] = {
 350     { 0x01, "Leaf Information required"},
 351     { 0, NULL}
 352 };
 353
 354 #define BGP_AIGP_TLV 1
 355
 356 static const struct tok bgp_aigp_values[] = {
 357     { BGP_AIGP_TLV, "AIGP"},
 358     { 0, NULL}
 359 };
 360
 361 /* Subsequent address family identifier, RFC2283 section 7 */
 362 #define SAFNUM_RES                      0
 363 #define SAFNUM_UNICAST                  1
 364 #define SAFNUM_MULTICAST                2
 365 #define SAFNUM_UNIMULTICAST             3       /* deprecated now */
 366 /* labeled BGP RFC3107 */
 367 #define SAFNUM_LABUNICAST               4
 368 /* RFC6514 */
 369 #define SAFNUM_MULTICAST_VPN            5
 370 /* draft-nalawade-kapoor-tunnel-safi */
 371 #define SAFNUM_TUNNEL                   64
 372 /* RFC4761 */
 373 #define SAFNUM_VPLS                     65
 374 /* RFC6037 */
 375 #define SAFNUM_MDT                      66
 376 /* RFC4364 */
 377 #define SAFNUM_VPNUNICAST               128
 378 /* RFC6513 */
 379 #define SAFNUM_VPNMULTICAST             129
 380 #define SAFNUM_VPNUNIMULTICAST          130     /* deprecated now */
 381 /* RFC4684 */
 382 #define SAFNUM_RT_ROUTING_INFO          132
 383
 384 #define BGP_VPN_RD_LEN                  8
 385
 386 static const struct tok bgp_safi_values[] = {
 387     { SAFNUM_RES,               "Reserved"},
 388     { SAFNUM_UNICAST,           "Unicast"},
 389     { SAFNUM_MULTICAST,         "Multicast"},
 390     { SAFNUM_UNIMULTICAST,      "Unicast+Multicast"},
 391     { SAFNUM_LABUNICAST,        "labeled Unicast"},
 392     { SAFNUM_TUNNEL,            "Tunnel"},
 393     { SAFNUM_VPLS,              "VPLS"},
 394     { SAFNUM_MDT,               "MDT"},
 395     { SAFNUM_VPNUNICAST,        "labeled VPN Unicast"},
 396     { SAFNUM_VPNMULTICAST,      "labeled VPN Multicast"},
 397     { SAFNUM_VPNUNIMULTICAST,   "labeled VPN Unicast+Multicast"},
 398     { SAFNUM_RT_ROUTING_INFO,   "Route Target Routing Information"},
 399     { SAFNUM_MULTICAST_VPN,     "Multicast VPN"},
 400     { 0, NULL }
 401 };
 402
 403 /* well-known community */
 404 #define BGP_COMMUNITY_NO_EXPORT                 0xffffff01
 405 #define BGP_COMMUNITY_NO_ADVERT                 0xffffff02
 406 #define BGP_COMMUNITY_NO_EXPORT_SUBCONFED       0xffffff03
 407
 408 /* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
 409 #define BGP_EXT_COM_RT_0        0x0002  /* Route Target,Format AS(2bytes):AN(4bytes) */
 410 #define BGP_EXT_COM_RT_1        0x0102  /* Route Target,Format IP address:AN(2bytes) */
 411 #define BGP_EXT_COM_RT_2        0x0202  /* Route Target,Format AN(4bytes):local(2bytes) */
 412 #define BGP_EXT_COM_RO_0        0x0003  /* Route Origin,Format AS(2bytes):AN(4bytes) */
 413 #define BGP_EXT_COM_RO_1        0x0103  /* Route Origin,Format IP address:AN(2bytes) */
 414 #define BGP_EXT_COM_RO_2        0x0203  /* Route Origin,Format AN(4bytes):local(2bytes) */
 415 #define BGP_EXT_COM_LINKBAND    0x4004  /* Link Bandwidth,Format AS(2B):Bandwidth(4B) */
 416                                         /* rfc2547 bgp-mpls-vpns */
 417 #define BGP_EXT_COM_VPN_ORIGIN  0x0005  /* OSPF Domain ID / VPN of Origin  - draft-rosen-vpns-ospf-bgp-mpls */
 418 #define BGP_EXT_COM_VPN_ORIGIN2 0x0105  /* duplicate - keep for backwards compatability */
 419 #define BGP_EXT_COM_VPN_ORIGIN3 0x0205  /* duplicate - keep for backwards compatability */
 420 #define BGP_EXT_COM_VPN_ORIGIN4 0x8005  /* duplicate - keep for backwards compatability */
 421
 422 #define BGP_EXT_COM_OSPF_RTYPE  0x0306  /* OSPF Route Type,Format Area(4B):RouteType(1B):Options(1B) */
 423 #define BGP_EXT_COM_OSPF_RTYPE2 0x8000  /* duplicate - keep for backwards compatability */
 424
 425 #define BGP_EXT_COM_OSPF_RID    0x0107  /* OSPF Router ID,Format RouterID(4B):Unused(2B) */
 426 #define BGP_EXT_COM_OSPF_RID2   0x8001  /* duplicate - keep for backwards compatability */
 427
 428 #define BGP_EXT_COM_L2INFO      0x800a  /* draft-kompella-ppvpn-l2vpn */
 429
 430 #define BGP_EXT_COM_SOURCE_AS   0x0009  /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
 431 #define BGP_EXT_COM_VRF_RT_IMP  0x010b  /* RFC-ietf-l3vpn-2547bis-mcast-bgp-08.txt */
 432 #define BGP_EXT_COM_L2VPN_RT_0  0x000a  /* L2VPN Identifier,Format AS(2bytes):AN(4bytes) */
 433 #define BGP_EXT_COM_L2VPN_RT_1  0xF10a  /* L2VPN Identifier,Format IP address:AN(2bytes) */
 434
 435 /* http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a00801eb09a.shtml  */
 436 #define BGP_EXT_COM_EIGRP_GEN   0x8800
 437 #define BGP_EXT_COM_EIGRP_METRIC_AS_DELAY  0x8801
 438 #define BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW 0x8802
 439 #define BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU  0x8803
 440 #define BGP_EXT_COM_EIGRP_EXT_REMAS_REMID  0x8804
 441 #define BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC 0x8805
 442
 443 static const struct tok bgp_extd_comm_flag_values[] = {
 444     { 0x8000,                  "vendor-specific"},
 445     { 0x4000,                  "non-transitive"},
 446     { 0, NULL},
 447 };
 448
 449 static const struct tok bgp_extd_comm_subtype_values[] = {
 450     { BGP_EXT_COM_RT_0,        "target"},
 451     { BGP_EXT_COM_RT_1,        "target"},
 452     { BGP_EXT_COM_RT_2,        "target"},
 453     { BGP_EXT_COM_RO_0,        "origin"},
 454     { BGP_EXT_COM_RO_1,        "origin"},
 455     { BGP_EXT_COM_RO_2,        "origin"},
 456     { BGP_EXT_COM_LINKBAND,    "link-BW"},
 457     { BGP_EXT_COM_VPN_ORIGIN,  "ospf-domain"},
 458     { BGP_EXT_COM_VPN_ORIGIN2, "ospf-domain"},
 459     { BGP_EXT_COM_VPN_ORIGIN3, "ospf-domain"},
 460     { BGP_EXT_COM_VPN_ORIGIN4, "ospf-domain"},
 461     { BGP_EXT_COM_OSPF_RTYPE,  "ospf-route-type"},
 462     { BGP_EXT_COM_OSPF_RTYPE2, "ospf-route-type"},
 463     { BGP_EXT_COM_OSPF_RID,    "ospf-router-id"},
 464     { BGP_EXT_COM_OSPF_RID2,   "ospf-router-id"},
 465     { BGP_EXT_COM_L2INFO,      "layer2-info"},
 466     { BGP_EXT_COM_EIGRP_GEN , "eigrp-general-route (flag, tag)" },
 467     { BGP_EXT_COM_EIGRP_METRIC_AS_DELAY , "eigrp-route-metric (AS, delay)" },
 468     { BGP_EXT_COM_EIGRP_METRIC_REL_NH_BW , "eigrp-route-metric (reliability, nexthop, bandwidth)" },
 469     { BGP_EXT_COM_EIGRP_METRIC_LOAD_MTU , "eigrp-route-metric (load, MTU)" },
 470     { BGP_EXT_COM_EIGRP_EXT_REMAS_REMID , "eigrp-external-route (remote-AS, remote-ID)" },
 471     { BGP_EXT_COM_EIGRP_EXT_REMPROTO_REMMETRIC , "eigrp-external-route (remote-proto, remote-metric)" },
 472     { BGP_EXT_COM_SOURCE_AS, "source-AS" },
 473     { BGP_EXT_COM_VRF_RT_IMP, "vrf-route-import"},
 474     { BGP_EXT_COM_L2VPN_RT_0, "l2vpn-id"},
 475     { BGP_EXT_COM_L2VPN_RT_1, "l2vpn-id"},
 476     { 0, NULL},
 477 };
 478
 479 /* OSPF codes for  BGP_EXT_COM_OSPF_RTYPE draft-rosen-vpns-ospf-bgp-mpls  */
 480 #define BGP_OSPF_RTYPE_RTR      1 /* OSPF Router LSA */
 481 #define BGP_OSPF_RTYPE_NET      2 /* OSPF Network LSA */
 482 #define BGP_OSPF_RTYPE_SUM      3 /* OSPF Summary LSA */
 483 #define BGP_OSPF_RTYPE_EXT      5 /* OSPF External LSA, note that ASBR doesn't apply to MPLS-VPN */
 484 #define BGP_OSPF_RTYPE_NSSA     7 /* OSPF NSSA External*/
 485 #define BGP_OSPF_RTYPE_SHAM     129 /* OSPF-MPLS-VPN Sham link */
 486 #define BGP_OSPF_RTYPE_METRIC_TYPE 0x1 /* LSB of RTYPE Options Field */
 487
 488 static const struct tok bgp_extd_comm_ospf_rtype_values[] = {
 489   { BGP_OSPF_RTYPE_RTR, "Router" },
 490   { BGP_OSPF_RTYPE_NET, "Network" },
 491   { BGP_OSPF_RTYPE_SUM, "Summary" },
 492   { BGP_OSPF_RTYPE_EXT, "External" },
 493   { BGP_OSPF_RTYPE_NSSA,"NSSA External" },
 494   { BGP_OSPF_RTYPE_SHAM,"MPLS-VPN Sham" },
 495   { 0, NULL },
 496 };
 497
 498 /* ADD-PATH Send/Receive field values */
 499 static const struct tok bgp_add_path_recvsend[] = {
 500   { 1, "Receive" },
 501   { 2, "Send" },
 502   { 3, "Both" },
 503   { 0, NULL },
 504 };
 505
 506 static char astostr[20];
 507
 508 /*
 509  * as_printf
 510  *
 511  * Convert an AS number into a string and return string pointer.
 512  *
 513  * Depending on bflag is set or not, AS number is converted into ASDOT notation
 514  * or plain number notation.
 515  *
 516  */
 517 static char *
 518 as_printf(netdissect_options *ndo,
 519           char *str, int size, u_int asnum)
 520 {
 521         if (!ndo->ndo_bflag || asnum <= 0xFFFF) {
 522                 snprintf(str, size, "%u", asnum);
 523         } else {
 524                 snprintf(str, size, "%u.%u", asnum >> 16, asnum & 0xFFFF);
 525         }
 526         return str;
 527 }
 528
 529 #define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
 530
 531 int
 532 decode_prefix4(netdissect_options *ndo,
 533                const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
 534 {
 535         struct in_addr addr;
 536         u_int plen, plenbytes;
 537
 538         ND_TCHECK(pptr[0]);
 539         ITEMCHECK(1);
 540         plen = pptr[0];
 541         if (32 < plen)
 542                 return -1;
 543         itemlen -= 1;
 544
 545         memset(&addr, 0, sizeof(addr));
 546         plenbytes = (plen + 7) / 8;
 547         ND_TCHECK2(pptr[1], plenbytes);
 548         ITEMCHECK(plenbytes);
 549         memcpy(&addr, &pptr[1], plenbytes);
 550         if (plen % 8) {
 551                 ((u_char *)&addr)[plenbytes - 1] &=
 552                         ((0xff00 >> (plen % 8)) & 0xff);
 553         }
 554         snprintf(buf, buflen, "%s/%d", ipaddr_string(ndo, &addr), plen);
 555         return 1 + plenbytes;
 556
 557 trunc:
 558         return -2;
 559
 560 badtlv:
 561         return -3;
 562 }
 563
 564 static int
 565 decode_labeled_prefix4(netdissect_options *ndo,
 566                        const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
 567 {
 568         struct in_addr addr;
 569         u_int plen, plenbytes;
 570
 571         /* prefix length and label = 4 bytes */
 572         ND_TCHECK2(pptr[0], 4);
 573         ITEMCHECK(4);
 574         plen = pptr[0];   /* get prefix length */
 575
 576         /* this is one of the weirdnesses of rfc3107
 577            the label length (actually the label + COS bits)
 578            is added to the prefix length;
 579            we also do only read out just one label -
 580            there is no real application for advertisement of
 581            stacked labels in a single BGP message
 582         */
 583
 584         if (24 > plen)
 585                 return -1;
 586
 587         plen-=24; /* adjust prefixlen - labellength */
 588
 589         if (32 < plen)
 590                 return -1;
 591         itemlen -= 4;
 592
 593         memset(&addr, 0, sizeof(addr));
 594         plenbytes = (plen + 7) / 8;
 595         ND_TCHECK2(pptr[4], plenbytes);
 596         ITEMCHECK(plenbytes);
 597         memcpy(&addr, &pptr[4], plenbytes);
 598         if (plen % 8) {
 599                 ((u_char *)&addr)[plenbytes - 1] &=
 600                         ((0xff00 >> (plen % 8)) & 0xff);
 601         }
 602         /* the label may get offsetted by 4 bits so lets shift it right */
 603         snprintf(buf, buflen, "%s/%d, label:%u %s",
 604                  ipaddr_string(ndo, &addr),
 605                  plen,
 606                  EXTRACT_24BITS(pptr+1)>>4,
 607                  ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
 608
 609         return 4 + plenbytes;
 610
 611 trunc:
 612         return -2;
 613
 614 badtlv:
 615         return -3;
 616 }
 617
 618 /*
 619  * bgp_vpn_ip_print
 620  *
 621  * print an ipv4 or ipv6 address into a buffer dependend on address length.
 622  */
 623 static char *
 624 bgp_vpn_ip_print(netdissect_options *ndo,
 625                  const u_char *pptr, u_int addr_length)
 626 {
 627
 628     /* worst case string is s fully formatted v6 address */
 629     static char addr[sizeof("1234:5678:89ab:cdef:1234:5678:89ab:cdef")];
 630     char *pos = addr;
 631
 632     switch(addr_length) {
 633     case (sizeof(struct in_addr) << 3): /* 32 */
 634         ND_TCHECK2(pptr[0], sizeof(struct in_addr));
 635         snprintf(pos, sizeof(addr), "%s", ipaddr_string(ndo, pptr));
 636         break;
 637     case (sizeof(struct in6_addr) << 3): /* 128 */
 638         ND_TCHECK2(pptr[0], sizeof(struct in6_addr));
 639         snprintf(pos, sizeof(addr), "%s", ip6addr_string(ndo, pptr));
 640         break;
 641     default:
 642         snprintf(pos, sizeof(addr), "bogus address length %u", addr_length);
 643         break;
 644     }
 645     pos += strlen(pos);
 646
 647 trunc:
 648     *(pos) = '\0';
 649     return (addr);
 650 }
 651
 652 /*
 653  * bgp_vpn_sg_print
 654  *
 655  * print an multicast s,g entry into a buffer.
 656  * the s,g entry is encoded like this.
 657  *
 658  * +-----------------------------------+
 659  * | Multicast Source Length (1 octet) |
 660  * +-----------------------------------+
 661  * |   Multicast Source (Variable)     |
 662  * +-----------------------------------+
 663  * |  Multicast Group Length (1 octet) |
 664  * +-----------------------------------+
 665  * |  Multicast Group   (Variable)     |
 666  * +-----------------------------------+
 667  *
 668  * return the number of bytes read from the wire.
 669  */
 670 static int
 671 bgp_vpn_sg_print(netdissect_options *ndo,
 672                  const u_char *pptr, char *buf, u_int buflen)
 673 {
 674     uint8_t addr_length;
 675     u_int total_length, offset;
 676
 677     total_length = 0;
 678
 679     /* Source address length, encoded in bits */
 680     ND_TCHECK2(pptr[0], 1);
 681     addr_length =  *pptr++;
 682
 683     /* Source address */
 684     ND_TCHECK2(pptr[0], (addr_length >> 3));
 685     total_length += (addr_length >> 3) + 1;
 686     offset = strlen(buf);
 687     if (addr_length) {
 688         snprintf(buf + offset, buflen - offset, ", Source %s",
 689                  bgp_vpn_ip_print(ndo, pptr, addr_length));
 690         pptr += (addr_length >> 3);
 691     }
 692
 693     /* Group address length, encoded in bits */
 694     ND_TCHECK2(pptr[0], 1);
 695     addr_length =  *pptr++;
 696
 697     /* Group address */
 698     ND_TCHECK2(pptr[0], (addr_length >> 3));
 699     total_length += (addr_length >> 3) + 1;
 700     offset = strlen(buf);
 701     if (addr_length) {
 702         snprintf(buf + offset, buflen - offset, ", Group %s",
 703                  bgp_vpn_ip_print(ndo, pptr, addr_length));
 704         pptr += (addr_length >> 3);
 705     }
 706
 707 trunc:
 708     return (total_length);
 709 }
 710
 711 /* RDs and RTs share the same semantics
 712  * we use bgp_vpn_rd_print for
 713  * printing route targets inside a NLRI */
 714 char *
 715 bgp_vpn_rd_print(netdissect_options *ndo,
 716                  const u_char *pptr)
 717 {
 718    /* allocate space for the largest possible string */
 719     static char rd[sizeof("xxxxxxxxxx:xxxxx (xxx.xxx.xxx.xxx:xxxxx)")];
 720     char *pos = rd;
 721
 722     /* ok lets load the RD format */
 723     switch (EXTRACT_16BITS(pptr)) {
 724
 725         /* 2-byte-AS:number fmt*/
 726     case 0:
 727         snprintf(pos, sizeof(rd) - (pos - rd), "%u:%u (= %u.%u.%u.%u)",
 728                  EXTRACT_16BITS(pptr+2),
 729                  EXTRACT_32BITS(pptr+4),
 730                  *(pptr+4), *(pptr+5), *(pptr+6), *(pptr+7));
 731         break;
 732         /* IP-address:AS fmt*/
 733
 734     case 1:
 735         snprintf(pos, sizeof(rd) - (pos - rd), "%u.%u.%u.%u:%u",
 736             *(pptr+2), *(pptr+3), *(pptr+4), *(pptr+5), EXTRACT_16BITS(pptr+6));
 737         break;
 738
 739         /* 4-byte-AS:number fmt*/
 740     case 2:
 741         snprintf(pos, sizeof(rd) - (pos - rd), "%s:%u (%u.%u.%u.%u:%u)",
 742             as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(pptr+2)),
 743             EXTRACT_16BITS(pptr+6), *(pptr+2), *(pptr+3), *(pptr+4),
 744             *(pptr+5), EXTRACT_16BITS(pptr+6));
 745         break;
 746     default:
 747         snprintf(pos, sizeof(rd) - (pos - rd), "unknown RD format");
 748         break;
 749     }
 750     pos += strlen(pos);
 751     *(pos) = '\0';
 752     return (rd);
 753 }
 754
 755 static int
 756 decode_rt_routing_info(netdissect_options *ndo,
 757                        const u_char *pptr, char *buf, u_int buflen)
 758 {
 759         uint8_t route_target[8];
 760         u_int plen;
 761         char asbuf[sizeof(astostr)]; /* bgp_vpn_rd_print() overwrites astostr */
 762
 763         /* NLRI "prefix length" from RFC 2858 Section 4. */
 764         ND_TCHECK(pptr[0]);
 765         plen = pptr[0];   /* get prefix length */
 766
 767         /* NLRI "prefix" (ibid), valid lengths are { 0, 32, 33, ..., 96 } bits.
 768          * RFC 4684 Section 4 defines the layout of "origin AS" and "route
 769          * target" fields inside the "prefix" depending on its length.
 770          */
 771         if (0 == plen) {
 772                 /* Without "origin AS", without "route target". */
 773                 snprintf(buf, buflen, "default route target");
 774                 return 1;
 775         }
 776
 777         if (32 > plen)
 778                 return -1;
 779
 780         /* With at least "origin AS", possibly with "route target". */
 781         ND_TCHECK_32BITS(pptr + 1);
 782         as_printf(ndo, asbuf, sizeof(asbuf), EXTRACT_32BITS(pptr + 1));
 783
 784         plen-=32; /* adjust prefix length */
 785
 786         if (64 < plen)
 787                 return -1;
 788
 789         /* From now on (plen + 7) / 8 evaluates to { 0, 1, 2, ..., 8 }
 790          * and gives the number of octets in the variable-length "route
 791          * target" field inside this NLRI "prefix". Look for it.
 792          */
 793         memset(&route_target, 0, sizeof(route_target));
 794         ND_TCHECK2(pptr[5], (plen + 7) / 8);
 795         memcpy(&route_target, &pptr[5], (plen + 7) / 8);
 796         /* Which specification says to do this? */
 797         if (plen % 8) {
 798                 ((u_char *)&route_target)[(plen + 7) / 8 - 1] &=
 799                         ((0xff00 >> (plen % 8)) & 0xff);
 800         }
 801         snprintf(buf, buflen, "origin AS: %s, route target %s",
 802             asbuf,
 803             bgp_vpn_rd_print(ndo, (u_char *)&route_target));
 804
 805         return 5 + (plen + 7) / 8;
 806
 807 trunc:
 808         return -2;
 809 }
 810
 811 static int
 812 decode_labeled_vpn_prefix4(netdissect_options *ndo,
 813                            const u_char *pptr, char *buf, u_int buflen)
 814 {
 815         struct in_addr addr;
 816         u_int plen;
 817
 818         ND_TCHECK(pptr[0]);
 819         plen = pptr[0];   /* get prefix length */
 820
 821         if ((24+64) > plen)
 822                 return -1;
 823
 824         plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
 825
 826         if (32 < plen)
 827                 return -1;
 828
 829         memset(&addr, 0, sizeof(addr));
 830         ND_TCHECK2(pptr[12], (plen + 7) / 8);
 831         memcpy(&addr, &pptr[12], (plen + 7) / 8);
 832         if (plen % 8) {
 833                 ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
 834                         ((0xff00 >> (plen % 8)) & 0xff);
 835         }
 836         /* the label may get offsetted by 4 bits so lets shift it right */
 837         snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
 838                  bgp_vpn_rd_print(ndo, pptr+4),
 839                  ipaddr_string(ndo, &addr),
 840                  plen,
 841                  EXTRACT_24BITS(pptr+1)>>4,
 842                  ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
 843
 844         return 12 + (plen + 7) / 8;
 845
 846 trunc:
 847         return -2;
 848 }
 849
 850 /*
 851  * +-------------------------------+
 852  * |                               |
 853  * |  RD:IPv4-address (12 octets)  |
 854  * |                               |
 855  * +-------------------------------+
 856  * |  MDT Group-address (4 octets) |
 857  * +-------------------------------+
 858  */
 859
 860 #define MDT_VPN_NLRI_LEN 16
 861
 862 static int
 863 decode_mdt_vpn_nlri(netdissect_options *ndo,
 864                     const u_char *pptr, char *buf, u_int buflen)
 865 {
 866
 867     const u_char *rd;
 868     const u_char *vpn_ip;
 869
 870     ND_TCHECK(pptr[0]);
 871
 872     /* if the NLRI is not predefined length, quit.*/
 873     if (*pptr != MDT_VPN_NLRI_LEN * 8)
 874         return -1;
 875     pptr++;
 876
 877     /* RD */
 878     ND_TCHECK2(pptr[0], 8);
 879     rd = pptr;
 880     pptr+=8;
 881
 882     /* IPv4 address */
 883     ND_TCHECK2(pptr[0], sizeof(struct in_addr));
 884     vpn_ip = pptr;
 885     pptr+=sizeof(struct in_addr);
 886
 887     /* MDT Group Address */
 888     ND_TCHECK2(pptr[0], sizeof(struct in_addr));
 889
 890     snprintf(buf, buflen, "RD: %s, VPN IP Address: %s, MC Group Address: %s",
 891              bgp_vpn_rd_print(ndo, rd), ipaddr_string(ndo, vpn_ip), ipaddr_string(ndo, pptr));
 892
 893     return MDT_VPN_NLRI_LEN + 1;
 894
 895  trunc:
 896
 897 return -2;
 898 }
 899
 900 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI   1
 901 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI   2
 902 #define BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI            3
 903 #define BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF 4
 904 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE     5
 905 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN  6
 906 #define BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN  7
 907
 908 static const struct tok bgp_multicast_vpn_route_type_values[] = {
 909     { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI, "Intra-AS I-PMSI"},
 910     { BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI, "Inter-AS I-PMSI"},
 911     { BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI, "S-PMSI"},
 912     { BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF, "Intra-AS Segment-Leaf"},
 913     { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE, "Source-Active"},
 914     { BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN, "Shared Tree Join"},
 915     { BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN, "Source Tree Join"},
 916     { 0, NULL}
 917 };
 918
 919 static int
 920 decode_multicast_vpn(netdissect_options *ndo,
 921                      const u_char *pptr, char *buf, u_int buflen)
 922 {
 923         uint8_t route_type, route_length, addr_length, sg_length;
 924         u_int offset;
 925
 926         ND_TCHECK2(pptr[0], 2);
 927         route_type = *pptr++;
 928         route_length = *pptr++;
 929
 930         snprintf(buf, buflen, "Route-Type: %s (%u), length: %u",
 931                  tok2str(bgp_multicast_vpn_route_type_values,
 932                          "Unknown", route_type),
 933                  route_type, route_length);
 934
 935         switch(route_type) {
 936         case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_I_PMSI:
 937             ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
 938             offset = strlen(buf);
 939             snprintf(buf + offset, buflen - offset, ", RD: %s, Originator %s",
 940                      bgp_vpn_rd_print(ndo, pptr),
 941                      bgp_vpn_ip_print(ndo, pptr + BGP_VPN_RD_LEN,
 942                                       (route_length - BGP_VPN_RD_LEN) << 3));
 943             break;
 944         case BGP_MULTICAST_VPN_ROUTE_TYPE_INTER_AS_I_PMSI:
 945             ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
 946             offset = strlen(buf);
 947             snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
 948                 bgp_vpn_rd_print(ndo, pptr),
 949                 as_printf(ndo, astostr, sizeof(astostr),
 950                 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
 951             break;
 952
 953         case BGP_MULTICAST_VPN_ROUTE_TYPE_S_PMSI:
 954             ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
 955             offset = strlen(buf);
 956             snprintf(buf + offset, buflen - offset, ", RD: %s",
 957                      bgp_vpn_rd_print(ndo, pptr));
 958             pptr += BGP_VPN_RD_LEN;
 959
 960             sg_length = bgp_vpn_sg_print(ndo, pptr, buf, buflen);
 961             addr_length =  route_length - sg_length;
 962
 963             ND_TCHECK2(pptr[0], addr_length);
 964             offset = strlen(buf);
 965             snprintf(buf + offset, buflen - offset, ", Originator %s",
 966                      bgp_vpn_ip_print(ndo, pptr, addr_length << 3));
 967             break;
 968
 969         case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_ACTIVE:
 970             ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN);
 971             offset = strlen(buf);
 972             snprintf(buf + offset, buflen - offset, ", RD: %s",
 973                      bgp_vpn_rd_print(ndo, pptr));
 974             pptr += BGP_VPN_RD_LEN;
 975
 976             bgp_vpn_sg_print(ndo, pptr, buf, buflen);
 977             break;
 978
 979         case BGP_MULTICAST_VPN_ROUTE_TYPE_SHARED_TREE_JOIN: /* fall through */
 980         case BGP_MULTICAST_VPN_ROUTE_TYPE_SOURCE_TREE_JOIN:
 981             ND_TCHECK2(pptr[0], BGP_VPN_RD_LEN + 4);
 982             offset = strlen(buf);
 983             snprintf(buf + offset, buflen - offset, ", RD: %s, Source-AS %s",
 984                 bgp_vpn_rd_print(ndo, pptr),
 985                 as_printf(ndo, astostr, sizeof(astostr),
 986                 EXTRACT_32BITS(pptr + BGP_VPN_RD_LEN)));
 987             pptr += BGP_VPN_RD_LEN + 4;
 988
 989             bgp_vpn_sg_print(ndo, pptr, buf, buflen);
 990             break;
 991
 992             /*
 993              * no per route-type printing yet.
 994              */
 995         case BGP_MULTICAST_VPN_ROUTE_TYPE_INTRA_AS_SEG_LEAF:
 996         default:
 997             break;
 998         }
 999
1000         return route_length + 2;
1001
1002 trunc:
1003         return -2;
1004 }
1005
1006 /*
1007  * As I remember, some versions of systems have an snprintf() that
1008  * returns -1 if the buffer would have overflowed.  If the return
1009  * value is negative, set buflen to 0, to indicate that we've filled
1010  * the buffer up.
1011  *
1012  * If the return value is greater than buflen, that means that
1013  * the buffer would have overflowed; again, set buflen to 0 in
1014  * that case.
1015  */
1016 #define UPDATE_BUF_BUFLEN(buf, buflen, stringlen) \
1017     if (stringlen<0) \
1018         buflen=0; \
1019     else if ((u_int)stringlen>buflen) \
1020         buflen=0; \
1021     else { \
1022         buflen-=stringlen; \
1023         buf+=stringlen; \
1024     }
1025
1026 static int
1027 decode_labeled_vpn_l2(netdissect_options *ndo,
1028                       const u_char *pptr, char *buf, u_int buflen)
1029 {
1030         int plen,tlen,stringlen,tlv_type,tlv_len,ttlv_len;
1031
1032         ND_TCHECK2(pptr[0], 2);
1033         plen=EXTRACT_16BITS(pptr);
1034         tlen=plen;
1035         pptr+=2;
1036         /* Old and new L2VPN NLRI share AFI/SAFI
1037          *   -> Assume a 12 Byte-length NLRI is auto-discovery-only
1038          *      and > 17 as old format. Complain for the middle case
1039          */
1040         if (plen==12) {
1041             /* assume AD-only with RD, BGPNH */
1042             ND_TCHECK2(pptr[0],12);
1043             buf[0]='\0';
1044             stringlen=snprintf(buf, buflen, "RD: %s, BGPNH: %s",
1045                                bgp_vpn_rd_print(ndo, pptr),
1046                                ipaddr_string(ndo, pptr+8)
1047                                );
1048             UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1049             pptr+=12;
1050             tlen-=12;
1051             return plen;
1052         } else if (plen>17) {
1053             /* assume old format */
1054             /* RD, ID, LBLKOFF, LBLBASE */
1055
1056             ND_TCHECK2(pptr[0],15);
1057             buf[0]='\0';
1058             stringlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
1059                                bgp_vpn_rd_print(ndo, pptr),
1060                                EXTRACT_16BITS(pptr+8),
1061                                EXTRACT_16BITS(pptr+10),
1062                                EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
1063             UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1064             pptr+=15;
1065             tlen-=15;
1066
1067             /* ok now the variable part - lets read out TLVs*/
1068             while (tlen>0) {
1069                 if (tlen < 3)
1070                     return -1;
1071                 ND_TCHECK2(pptr[0], 3);
1072                 tlv_type=*pptr++;
1073                 tlv_len=EXTRACT_16BITS(pptr);
1074                 ttlv_len=tlv_len;
1075                 pptr+=2;
1076
1077                 switch(tlv_type) {
1078                 case 1:
1079                     if (buflen!=0) {
1080                         stringlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
1081                                            tlv_type,
1082                                            tlv_len);
1083                         UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1084                     }
1085                     ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
1086                     while (ttlv_len>0) {
1087                         ND_TCHECK(pptr[0]);
1088                         if (buflen!=0) {
1089                             stringlen=snprintf(buf,buflen, "%02x",*pptr++);
1090                             UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1091                         }
1092                         ttlv_len--;
1093                     }
1094                     break;
1095                 default:
1096                     if (buflen!=0) {
1097                         stringlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
1098                                            tlv_type,
1099                                            tlv_len);
1100                         UPDATE_BUF_BUFLEN(buf, buflen, stringlen);
1101                     }
1102                     break;
1103                 }
1104                 tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
1105             }
1106             return plen+2;
1107
1108         } else {
1109             /* complain bitterly ? */
1110             /* fall through */
1111             goto trunc;
1112         }
1113
1114 trunc:
1115         return -2;
1116 }
1117
1118 int
1119 decode_prefix6(netdissect_options *ndo,
1120                const u_char *pd, u_int itemlen, char *buf, u_int buflen)
1121 {
1122         struct in6_addr addr;
1123         u_int plen, plenbytes;
1124
1125         ND_TCHECK(pd[0]);
1126         ITEMCHECK(1);
1127         plen = pd[0];
1128         if (128 < plen)
1129                 return -1;
1130         itemlen -= 1;
1131
1132         memset(&addr, 0, sizeof(addr));
1133         plenbytes = (plen + 7) / 8;
1134         ND_TCHECK2(pd[1], plenbytes);
1135         ITEMCHECK(plenbytes);
1136         memcpy(&addr, &pd[1], plenbytes);
1137         if (plen % 8) {
1138                 addr.s6_addr[plenbytes - 1] &=
1139                         ((0xff00 >> (plen % 8)) & 0xff);
1140         }
1141         snprintf(buf, buflen, "%s/%d", ip6addr_string(ndo, &addr), plen);
1142         return 1 + plenbytes;
1143
1144 trunc:
1145         return -2;
1146
1147 badtlv:
1148         return -3;
1149 }
1150
1151 static int
1152 decode_labeled_prefix6(netdissect_options *ndo,
1153                        const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
1154 {
1155         struct in6_addr addr;
1156         u_int plen, plenbytes;
1157
1158         /* prefix length and label = 4 bytes */
1159         ND_TCHECK2(pptr[0], 4);
1160         ITEMCHECK(4);
1161         plen = pptr[0]; /* get prefix length */
1162
1163         if (24 > plen)
1164                 return -1;
1165
1166         plen-=24; /* adjust prefixlen - labellength */
1167
1168         if (128 < plen)
1169                 return -1;
1170         itemlen -= 4;
1171
1172         memset(&addr, 0, sizeof(addr));
1173         plenbytes = (plen + 7) / 8;
1174         ND_TCHECK2(pptr[4], plenbytes);
1175         memcpy(&addr, &pptr[4], plenbytes);
1176         if (plen % 8) {
1177                 addr.s6_addr[plenbytes - 1] &=
1178                         ((0xff00 >> (plen % 8)) & 0xff);
1179         }
1180         /* the label may get offsetted by 4 bits so lets shift it right */
1181         snprintf(buf, buflen, "%s/%d, label:%u %s",
1182                  ip6addr_string(ndo, &addr),
1183                  plen,
1184                  EXTRACT_24BITS(pptr+1)>>4,
1185                  ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1186
1187         return 4 + plenbytes;
1188
1189 trunc:
1190         return -2;
1191
1192 badtlv:
1193         return -3;
1194 }
1195
1196 static int
1197 decode_labeled_vpn_prefix6(netdissect_options *ndo,
1198                            const u_char *pptr, char *buf, u_int buflen)
1199 {
1200         struct in6_addr addr;
1201         u_int plen;
1202
1203         ND_TCHECK(pptr[0]);
1204         plen = pptr[0];   /* get prefix length */
1205
1206         if ((24+64) > plen)
1207                 return -1;
1208
1209         plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1210
1211         if (128 < plen)
1212                 return -1;
1213
1214         memset(&addr, 0, sizeof(addr));
1215         ND_TCHECK2(pptr[12], (plen + 7) / 8);
1216         memcpy(&addr, &pptr[12], (plen + 7) / 8);
1217         if (plen % 8) {
1218                 addr.s6_addr[(plen + 7) / 8 - 1] &=
1219                         ((0xff00 >> (plen % 8)) & 0xff);
1220         }
1221         /* the label may get offsetted by 4 bits so lets shift it right */
1222         snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1223                  bgp_vpn_rd_print(ndo, pptr+4),
1224                  ip6addr_string(ndo, &addr),
1225                  plen,
1226                  EXTRACT_24BITS(pptr+1)>>4,
1227                  ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1228
1229         return 12 + (plen + 7) / 8;
1230
1231 trunc:
1232         return -2;
1233 }
1234
1235 static int
1236 decode_clnp_prefix(netdissect_options *ndo,
1237                    const u_char *pptr, char *buf, u_int buflen)
1238 {
1239         uint8_t addr[19];
1240         u_int plen;
1241
1242         ND_TCHECK(pptr[0]);
1243         plen = pptr[0]; /* get prefix length */
1244
1245         if (152 < plen)
1246                 return -1;
1247
1248         memset(&addr, 0, sizeof(addr));
1249         ND_TCHECK2(pptr[4], (plen + 7) / 8);
1250         memcpy(&addr, &pptr[4], (plen + 7) / 8);
1251         if (plen % 8) {
1252                 addr[(plen + 7) / 8 - 1] &=
1253                         ((0xff00 >> (plen % 8)) & 0xff);
1254         }
1255         snprintf(buf, buflen, "%s/%d",
1256                  isonsap_string(ndo, addr,(plen + 7) / 8),
1257                  plen);
1258
1259         return 1 + (plen + 7) / 8;
1260
1261 trunc:
1262         return -2;
1263 }
1264
1265 static int
1266 decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
1267                                const u_char *pptr, char *buf, u_int buflen)
1268 {
1269         uint8_t addr[19];
1270         u_int plen;
1271
1272         ND_TCHECK(pptr[0]);
1273         plen = pptr[0];   /* get prefix length */
1274
1275         if ((24+64) > plen)
1276                 return -1;
1277
1278         plen-=(24+64); /* adjust prefixlen - labellength - RD len*/
1279
1280         if (152 < plen)
1281                 return -1;
1282
1283         memset(&addr, 0, sizeof(addr));
1284         ND_TCHECK2(pptr[12], (plen + 7) / 8);
1285         memcpy(&addr, &pptr[12], (plen + 7) / 8);
1286         if (plen % 8) {
1287                 addr[(plen + 7) / 8 - 1] &=
1288                         ((0xff00 >> (plen % 8)) & 0xff);
1289         }
1290         /* the label may get offsetted by 4 bits so lets shift it right */
1291         snprintf(buf, buflen, "RD: %s, %s/%d, label:%u %s",
1292                  bgp_vpn_rd_print(ndo, pptr+4),
1293                  isonsap_string(ndo, addr,(plen + 7) / 8),
1294                  plen,
1295                  EXTRACT_24BITS(pptr+1)>>4,
1296                  ((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
1297
1298         return 12 + (plen + 7) / 8;
1299
1300 trunc:
1301         return -2;
1302 }
1303
1304 /*
1305  * bgp_attr_get_as_size
1306  *
1307  * Try to find the size of the ASs encoded in an as-path. It is not obvious, as
1308  * both Old speakers that do not support 4 byte AS, and the new speakers that do
1309  * support, exchange AS-Path with the same path-attribute type value 0x02.
1310  */
1311 static int
1312 bgp_attr_get_as_size(netdissect_options *ndo,
1313                      uint8_t bgpa_type, const u_char *pptr, int len)
1314 {
1315     const u_char *tptr = pptr;
1316
1317     /*
1318      * If the path attribute is the optional AS4 path type, then we already
1319      * know, that ASs must be encoded in 4 byte format.
1320      */
1321     if (bgpa_type == BGPTYPE_AS4_PATH) {
1322         return 4;
1323     }
1324
1325     /*
1326      * Let us assume that ASs are of 2 bytes in size, and check if the AS-Path
1327      * TLV is good. If not, ask the caller to try with AS encoded as 4 bytes
1328      * each.
1329      */
1330     while (tptr < pptr + len) {
1331         ND_TCHECK(tptr[0]);
1332
1333         /*
1334          * If we do not find a valid segment type, our guess might be wrong.
1335          */
1336         if (tptr[0] < BGP_AS_SEG_TYPE_MIN || tptr[0] > BGP_AS_SEG_TYPE_MAX) {
1337             goto trunc;
1338         }
1339         ND_TCHECK(tptr[1]);
1340         tptr += 2 + tptr[1] * 2;
1341     }
1342
1343     /*
1344      * If we correctly reached end of the AS path attribute data content,
1345      * then most likely ASs were indeed encoded as 2 bytes.
1346      */
1347     if (tptr == pptr + len) {
1348         return 2;
1349     }
1350
1351 trunc:
1352
1353     /*
1354      * We can come here, either we did not have enough data, or if we
1355      * try to decode 4 byte ASs in 2 byte format. Either way, return 4,
1356      * so that calller can try to decode each AS as of 4 bytes. If indeed
1357      * there was not enough data, it will crib and end the parse anyways.
1358      */
1359    return 4;
1360 }
1361
1362 static int
1363 bgp_attr_print(netdissect_options *ndo,
1364                u_int atype, const u_char *pptr, u_int len, const unsigned attr_set_level)
1365 {
1366         int i;
1367         uint16_t af;
1368         uint8_t safi, snpa, nhlen;
1369         union { /* copy buffer for bandwidth values */
1370             float f;
1371             uint32_t i;
1372         } bw;
1373         int advance;
1374         u_int tlen;
1375         const u_char *tptr;
1376         char buf[MAXHOSTNAMELEN + 100];
1377         int  as_size;
1378
1379         tptr = pptr;
1380         tlen=len;
1381
1382         switch (atype) {
1383         case BGPTYPE_ORIGIN:
1384                 if (len != 1)
1385                         ND_PRINT((ndo, "invalid len"));
1386                 else {
1387                         ND_TCHECK(*tptr);
1388                         ND_PRINT((ndo, "%s", tok2str(bgp_origin_values,
1389                                                 "Unknown Origin Typecode",
1390                                                 tptr[0])));
1391                 }
1392                 break;
1393
1394         /*
1395          * Process AS4 byte path and AS2 byte path attributes here.
1396          */
1397         case BGPTYPE_AS4_PATH:
1398         case BGPTYPE_AS_PATH:
1399                 if (len % 2) {
1400                         ND_PRINT((ndo, "invalid len"));
1401                         break;
1402                 }
1403                 if (!len) {
1404                         ND_PRINT((ndo, "empty"));
1405                         break;
1406                 }
1407
1408                 /*
1409                  * BGP updates exchanged between New speakers that support 4
1410                  * byte AS, ASs are always encoded in 4 bytes. There is no
1411                  * definitive way to find this, just by the packet's
1412                  * contents. So, check for packet's TLV's sanity assuming
1413                  * 2 bytes first, and it does not pass, assume that ASs are
1414                  * encoded in 4 bytes format and move on.
1415                  */
1416                 as_size = bgp_attr_get_as_size(ndo, atype, pptr, len);
1417
1418                 while (tptr < pptr + len) {
1419                         ND_TCHECK(tptr[0]);
1420                         ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_open_values,
1421                                                 "?", tptr[0])));
1422                         ND_TCHECK(tptr[1]);
1423                         for (i = 0; i < tptr[1] * as_size; i += as_size) {
1424                             ND_TCHECK2(tptr[2 + i], as_size);
1425                             ND_PRINT((ndo, "%s ",
1426                                 as_printf(ndo, astostr, sizeof(astostr),
1427                                 as_size == 2 ?
1428                                 EXTRACT_16BITS(&tptr[2 + i]) :
1429                                 EXTRACT_32BITS(&tptr[2 + i]))));
1430                         }
1431                         ND_TCHECK(tptr[0]);
1432                         ND_PRINT((ndo, "%s", tok2str(bgp_as_path_segment_close_values,
1433                                                 "?", tptr[0])));
1434                         ND_TCHECK(tptr[1]);
1435                         tptr += 2 + tptr[1] * as_size;
1436                 }
1437                 break;
1438         case BGPTYPE_NEXT_HOP:
1439                 if (len != 4)
1440                         ND_PRINT((ndo, "invalid len"));
1441                 else {
1442                         ND_TCHECK2(tptr[0], 4);
1443                         ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1444                 }
1445                 break;
1446         case BGPTYPE_MULTI_EXIT_DISC:
1447         case BGPTYPE_LOCAL_PREF:
1448                 if (len != 4)
1449                         ND_PRINT((ndo, "invalid len"));
1450                 else {
1451                         ND_TCHECK2(tptr[0], 4);
1452                         ND_PRINT((ndo, "%u", EXTRACT_32BITS(tptr)));
1453                 }
1454                 break;
1455         case BGPTYPE_ATOMIC_AGGREGATE:
1456                 if (len != 0)
1457                         ND_PRINT((ndo, "invalid len"));
1458                 break;
1459         case BGPTYPE_AGGREGATOR:
1460
1461                 /*
1462                  * Depending on the AS encoded is of 2 bytes or of 4 bytes,
1463                  * the length of this PA can be either 6 bytes or 8 bytes.
1464                  */
1465                 if (len != 6 && len != 8) {
1466                     ND_PRINT((ndo, "invalid len"));
1467                     break;
1468                 }
1469                 ND_TCHECK2(tptr[0], len);
1470                 if (len == 6) {
1471                     ND_PRINT((ndo, " AS #%s, origin %s",
1472                         as_printf(ndo, astostr, sizeof(astostr), EXTRACT_16BITS(tptr)),
1473                         ipaddr_string(ndo, tptr + 2)));
1474                 } else {
1475                     ND_PRINT((ndo, " AS #%s, origin %s",
1476                         as_printf(ndo, astostr, sizeof(astostr),
1477                         EXTRACT_32BITS(tptr)), ipaddr_string(ndo, tptr + 4)));
1478                 }
1479                 break;
1480         case BGPTYPE_AGGREGATOR4:
1481                 if (len != 8) {
1482                         ND_PRINT((ndo, "invalid len"));
1483                         break;
1484                 }
1485                 ND_TCHECK2(tptr[0], 8);
1486                 ND_PRINT((ndo, " AS #%s, origin %s",
1487                     as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr)),
1488                     ipaddr_string(ndo, tptr + 4)));
1489                 break;
1490         case BGPTYPE_COMMUNITIES:
1491                 if (len % 4) {
1492                         ND_PRINT((ndo, "invalid len"));
1493                         break;
1494                 }
1495                 while (tlen>0) {
1496                         uint32_t comm;
1497                         ND_TCHECK2(tptr[0], 4);
1498                         comm = EXTRACT_32BITS(tptr);
1499                         switch (comm) {
1500                         case BGP_COMMUNITY_NO_EXPORT:
1501                                 ND_PRINT((ndo, " NO_EXPORT"));
1502                                 break;
1503                         case BGP_COMMUNITY_NO_ADVERT:
1504                                 ND_PRINT((ndo, " NO_ADVERTISE"));
1505                                 break;
1506                         case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
1507                                 ND_PRINT((ndo, " NO_EXPORT_SUBCONFED"));
1508                                 break;
1509                         default:
1510                                 ND_PRINT((ndo, "%u:%u%s",
1511                                        (comm >> 16) & 0xffff,
1512                                        comm & 0xffff,
1513                                        (tlen>4) ? ", " : ""));
1514                                 break;
1515                         }
1516                         tlen -=4;
1517                         tptr +=4;
1518                 }
1519                 break;
1520         case BGPTYPE_ORIGINATOR_ID:
1521                 if (len != 4) {
1522                         ND_PRINT((ndo, "invalid len"));
1523                         break;
1524                 }
1525                 ND_TCHECK2(tptr[0], 4);
1526                 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1527                 break;
1528         case BGPTYPE_CLUSTER_LIST:
1529                 if (len % 4) {
1530                         ND_PRINT((ndo, "invalid len"));
1531                         break;
1532                 }
1533                 while (tlen>0) {
1534                         ND_TCHECK2(tptr[0], 4);
1535                         ND_PRINT((ndo, "%s%s",
1536                                ipaddr_string(ndo, tptr),
1537                                 (tlen>4) ? ", " : ""));
1538                         tlen -=4;
1539                         tptr +=4;
1540                 }
1541                 break;
1542         case BGPTYPE_MP_REACH_NLRI:
1543                 ND_TCHECK2(tptr[0], 3);
1544                 af = EXTRACT_16BITS(tptr);
1545                 safi = tptr[2];
1546
1547                 ND_PRINT((ndo, "\n\t    AFI: %s (%u), %sSAFI: %s (%u)",
1548                        tok2str(af_values, "Unknown AFI", af),
1549                        af,
1550                        (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1551                        tok2str(bgp_safi_values, "Unknown SAFI", safi),
1552                        safi));
1553
1554                 switch(af<<8 | safi) {
1555                 case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1556                 case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1557                 case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1558                 case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1559                 case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1560                 case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1561                 case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1562                 case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1563                 case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1564                 case (AFNUM_INET<<8 | SAFNUM_MDT):
1565                 case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1566                 case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1567                 case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1568                 case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1569                 case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1570                 case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1571                 case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1572                 case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1573                 case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1574                 case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1575                 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1576                 case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1577                 case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1578                 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1579                 case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1580                 case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1581                 case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1582                     break;
1583                 default:
1584                     ND_TCHECK2(tptr[0], tlen);
1585                     ND_PRINT((ndo, "\n\t    no AFI %u / SAFI %u decoder", af, safi));
1586                     if (ndo->ndo_vflag <= 1)
1587                         print_unknown_data(ndo, tptr, "\n\t    ", tlen);
1588                     goto done;
1589                     break;
1590                 }
1591
1592                 tptr +=3;
1593
1594                 ND_TCHECK(tptr[0]);
1595                 nhlen = tptr[0];
1596                 tlen = nhlen;
1597                 tptr++;
1598
1599                 if (tlen) {
1600                     int nnh = 0;
1601                     ND_PRINT((ndo, "\n\t    nexthop: "));
1602                     while (tlen > 0) {
1603                         if ( nnh++ > 0 ) {
1604                             ND_PRINT((ndo,  ", " ));
1605                         }
1606                         switch(af<<8 | safi) {
1607                         case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1608                         case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1609                         case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1610                         case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1611                         case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1612                         case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN):
1613                         case (AFNUM_INET<<8 | SAFNUM_MDT):
1614                             if (tlen < (int)sizeof(struct in_addr)) {
1615                                 ND_PRINT((ndo, "invalid len"));
1616                                 tlen = 0;
1617                             } else {
1618                                 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1619                                 ND_PRINT((ndo, "%s",ipaddr_string(ndo, tptr)));
1620                                 tlen -= sizeof(struct in_addr);
1621                                 tptr += sizeof(struct in_addr);
1622                             }
1623                             break;
1624                         case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1625                         case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1626                         case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1627                             if (tlen < (int)(sizeof(struct in_addr)+BGP_VPN_RD_LEN)) {
1628                                 ND_PRINT((ndo, "invalid len"));
1629                                 tlen = 0;
1630                             } else {
1631                                 ND_TCHECK2(tptr[0], sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1632                                 ND_PRINT((ndo, "RD: %s, %s",
1633                                        bgp_vpn_rd_print(ndo, tptr),
1634                                        ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1635                                 tlen -= (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1636                                 tptr += (sizeof(struct in_addr)+BGP_VPN_RD_LEN);
1637                             }
1638                             break;
1639                         case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1640                         case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1641                         case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1642                         case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1643                             if (tlen < (int)sizeof(struct in6_addr)) {
1644                                 ND_PRINT((ndo, "invalid len"));
1645                                 tlen = 0;
1646                             } else {
1647                                 ND_TCHECK2(tptr[0], sizeof(struct in6_addr));
1648                                 ND_PRINT((ndo, "%s", ip6addr_string(ndo, tptr)));
1649                                 tlen -= sizeof(struct in6_addr);
1650                                 tptr += sizeof(struct in6_addr);
1651                             }
1652                             break;
1653                         case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1654                         case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1655                         case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1656                             if (tlen < (int)(sizeof(struct in6_addr)+BGP_VPN_RD_LEN)) {
1657                                 ND_PRINT((ndo, "invalid len"));
1658                                 tlen = 0;
1659                             } else {
1660                                 ND_TCHECK2(tptr[0], sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1661                                 ND_PRINT((ndo, "RD: %s, %s",
1662                                        bgp_vpn_rd_print(ndo, tptr),
1663                                        ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN)));
1664                                 tlen -= (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1665                                 tptr += (sizeof(struct in6_addr)+BGP_VPN_RD_LEN);
1666                             }
1667                             break;
1668                         case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1669                         case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1670                         case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1671                         case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1672                             if (tlen < (int)sizeof(struct in_addr)) {
1673                                 ND_PRINT((ndo, "invalid len"));
1674                                 tlen = 0;
1675                             } else {
1676                                 ND_TCHECK2(tptr[0], sizeof(struct in_addr));
1677                                 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
1678                                 tlen -= (sizeof(struct in_addr));
1679                                 tptr += (sizeof(struct in_addr));
1680                             }
1681                             break;
1682                         case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1683                         case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1684                         case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1685                             ND_TCHECK2(tptr[0], tlen);
1686                             ND_PRINT((ndo, "%s", isonsap_string(ndo, tptr, tlen)));
1687                             tptr += tlen;
1688                             tlen = 0;
1689                             break;
1690
1691                         case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1692                         case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1693                         case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1694                             if (tlen < BGP_VPN_RD_LEN+1) {
1695                                 ND_PRINT((ndo, "invalid len"));
1696                                 tlen = 0;
1697                             } else {
1698                                 ND_TCHECK2(tptr[0], tlen);
1699                                 ND_PRINT((ndo, "RD: %s, %s",
1700                                        bgp_vpn_rd_print(ndo, tptr),
1701                                        isonsap_string(ndo, tptr+BGP_VPN_RD_LEN,tlen-BGP_VPN_RD_LEN)));
1702                                 /* rfc986 mapped IPv4 address ? */
1703                                 if (tlen == BGP_VPN_RD_LEN + 4 + sizeof(struct in_addr)
1704                                     && EXTRACT_32BITS(tptr+BGP_VPN_RD_LEN) ==  0x47000601)
1705                                     ND_PRINT((ndo, " = %s", ipaddr_string(ndo, tptr+BGP_VPN_RD_LEN+4)));
1706                                 /* rfc1888 mapped IPv6 address ? */
1707                                 else if (tlen == BGP_VPN_RD_LEN + 3 + sizeof(struct in6_addr)
1708                                          && EXTRACT_24BITS(tptr+BGP_VPN_RD_LEN) ==  0x350000)
1709                                     ND_PRINT((ndo, " = %s", ip6addr_string(ndo, tptr+BGP_VPN_RD_LEN+3)));
1710                                 tptr += tlen;
1711                                 tlen = 0;
1712                             }
1713                             break;
1714                         default:
1715                             ND_TCHECK2(tptr[0], tlen);
1716                             ND_PRINT((ndo, "no AFI %u/SAFI %u decoder", af, safi));
1717                             if (ndo->ndo_vflag <= 1)
1718                                 print_unknown_data(ndo, tptr, "\n\t    ", tlen);
1719                             tptr += tlen;
1720                             tlen = 0;
1721                             goto done;
1722                             break;
1723                         }
1724                     }
1725                 }
1726                 ND_PRINT((ndo, ", nh-length: %u", nhlen));
1727                 tptr += tlen;
1728
1729                 ND_TCHECK(tptr[0]);
1730                 snpa = tptr[0];
1731                 tptr++;
1732
1733                 if (snpa) {
1734                         ND_PRINT((ndo, "\n\t    %u SNPA", snpa));
1735                         for (/*nothing*/; snpa > 0; snpa--) {
1736                                 ND_TCHECK(tptr[0]);
1737                                 ND_PRINT((ndo, "\n\t      %d bytes", tptr[0]));
1738                                 tptr += tptr[0] + 1;
1739                         }
1740                 } else {
1741                         ND_PRINT((ndo, ", no SNPA"));
1742                 }
1743
1744                 while (tptr < pptr + len) {
1745                     switch (af<<8 | safi) {
1746                     case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1747                     case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1748                     case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1749                         advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1750                         if (advance == -1)
1751                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1752                         else if (advance == -2)
1753                             goto trunc;
1754                         else if (advance == -3)
1755                             break; /* bytes left, but not enough */
1756                         else
1757                             ND_PRINT((ndo, "\n\t      %s", buf));
1758                         break;
1759                     case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1760                         advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1761                         if (advance == -1)
1762                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1763                         else if (advance == -2)
1764                             goto trunc;
1765                         else if (advance == -3)
1766                             break; /* bytes left, but not enough */
1767                         else
1768                             ND_PRINT((ndo, "\n\t      %s", buf));
1769                         break;
1770                     case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1771                     case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1772                     case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1773                         advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1774                         if (advance == -1)
1775                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1776                         else if (advance == -2)
1777                             goto trunc;
1778                         else
1779                             ND_PRINT((ndo, "\n\t      %s", buf));
1780                         break;
1781                     case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
1782                         advance = decode_rt_routing_info(ndo, tptr, buf, sizeof(buf));
1783                         if (advance == -1)
1784                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1785                         else if (advance == -2)
1786                             goto trunc;
1787                         else
1788                             ND_PRINT((ndo, "\n\t      %s", buf));
1789                         break;
1790                     case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
1791                     case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
1792                         advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
1793                         if (advance == -1)
1794                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1795                         else if (advance == -2)
1796                             goto trunc;
1797                         else
1798                             ND_PRINT((ndo, "\n\t      %s", buf));
1799                         break;
1800
1801                     case (AFNUM_INET<<8 | SAFNUM_MDT):
1802                       advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
1803                       if (advance == -1)
1804                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1805                         else if (advance == -2)
1806                             goto trunc;
1807                         else
1808                             ND_PRINT((ndo, "\n\t      %s", buf));
1809                        break;
1810                     case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1811                     case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1812                     case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1813                         advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1814                         if (advance == -1)
1815                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1816                         else if (advance == -2)
1817                             goto trunc;
1818                         else if (advance == -3)
1819                             break; /* bytes left, but not enough */
1820                         else
1821                             ND_PRINT((ndo, "\n\t      %s", buf));
1822                         break;
1823                     case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1824                         advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1825                         if (advance == -1)
1826                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1827                         else if (advance == -2)
1828                             goto trunc;
1829                         else if (advance == -3)
1830                             break; /* bytes left, but not enough */
1831                         else
1832                             ND_PRINT((ndo, "\n\t      %s", buf));
1833                         break;
1834                     case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1835                     case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1836                     case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1837                         advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1838                         if (advance == -1)
1839                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1840                         else if (advance == -2)
1841                             goto trunc;
1842                         else
1843                             ND_PRINT((ndo, "\n\t      %s", buf));
1844                         break;
1845                     case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1846                     case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1847                     case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1848                     case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1849                         advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1850                         if (advance == -1)
1851                             ND_PRINT((ndo, "\n\t    (illegal length)"));
1852                         else if (advance == -2)
1853                             goto trunc;
1854                         else
1855                             ND_PRINT((ndo, "\n\t      %s", buf));
1856                         break;
1857                     case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1858                     case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1859                     case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1860                         advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1861                         if (advance == -1)
1862                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1863                         else if (advance == -2)
1864                             goto trunc;
1865                         else
1866                             ND_PRINT((ndo, "\n\t      %s", buf));
1867                         break;
1868                     case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
1869                     case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
1870                     case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
1871                         advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
1872                         if (advance == -1)
1873                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1874                         else if (advance == -2)
1875                             goto trunc;
1876                         else
1877                             ND_PRINT((ndo, "\n\t      %s", buf));
1878                         break;
1879                     default:
1880                         ND_TCHECK2(*tptr,tlen);
1881                         ND_PRINT((ndo, "\n\t    no AFI %u / SAFI %u decoder", af, safi));
1882                         if (ndo->ndo_vflag <= 1)
1883                             print_unknown_data(ndo, tptr, "\n\t    ", tlen);
1884                         advance = 0;
1885                         tptr = pptr + len;
1886                         break;
1887                     }
1888                     if (advance < 0)
1889                         break;
1890                     tptr += advance;
1891                 }
1892         done:
1893                 break;
1894
1895         case BGPTYPE_MP_UNREACH_NLRI:
1896                 ND_TCHECK2(tptr[0], BGP_MP_NLRI_MINSIZE);
1897                 af = EXTRACT_16BITS(tptr);
1898                 safi = tptr[2];
1899
1900                 ND_PRINT((ndo, "\n\t    AFI: %s (%u), %sSAFI: %s (%u)",
1901                        tok2str(af_values, "Unknown AFI", af),
1902                        af,
1903                        (safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
1904                        tok2str(bgp_safi_values, "Unknown SAFI", safi),
1905                        safi));
1906
1907                 if (len == BGP_MP_NLRI_MINSIZE)
1908                     ND_PRINT((ndo, "\n\t      End-of-Rib Marker (empty NLRI)"));
1909
1910                 tptr += 3;
1911
1912                 while (tptr < pptr + len) {
1913                     switch (af<<8 | safi) {
1914                     case (AFNUM_INET<<8 | SAFNUM_UNICAST):
1915                     case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
1916                     case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
1917                         advance = decode_prefix4(ndo, tptr, len, buf, sizeof(buf));
1918                         if (advance == -1)
1919                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1920                         else if (advance == -2)
1921                             goto trunc;
1922                         else if (advance == -3)
1923                             break; /* bytes left, but not enough */
1924                         else
1925                             ND_PRINT((ndo, "\n\t      %s", buf));
1926                         break;
1927                     case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
1928                         advance = decode_labeled_prefix4(ndo, tptr, len, buf, sizeof(buf));
1929                         if (advance == -1)
1930                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1931                         else if (advance == -2)
1932                             goto trunc;
1933                         else if (advance == -3)
1934                             break; /* bytes left, but not enough */
1935                         else
1936                             ND_PRINT((ndo, "\n\t      %s", buf));
1937                         break;
1938                     case (AFNUM_INET<<8 | SAFNUM_VPNUNICAST):
1939                     case (AFNUM_INET<<8 | SAFNUM_VPNMULTICAST):
1940                     case (AFNUM_INET<<8 | SAFNUM_VPNUNIMULTICAST):
1941                         advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, sizeof(buf));
1942                         if (advance == -1)
1943                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1944                         else if (advance == -2)
1945                             goto trunc;
1946                         else
1947                             ND_PRINT((ndo, "\n\t      %s", buf));
1948                         break;
1949                     case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
1950                     case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
1951                     case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
1952                         advance = decode_prefix6(ndo, tptr, len, buf, sizeof(buf));
1953                         if (advance == -1)
1954                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1955                         else if (advance == -2)
1956                             goto trunc;
1957                         else if (advance == -3)
1958                             break; /* bytes left, but not enough */
1959                         else
1960                             ND_PRINT((ndo, "\n\t      %s", buf));
1961                         break;
1962                     case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
1963                         advance = decode_labeled_prefix6(ndo, tptr, len, buf, sizeof(buf));
1964                         if (advance == -1)
1965                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1966                         else if (advance == -2)
1967                             goto trunc;
1968                         else if (advance == -3)
1969                             break; /* bytes left, but not enough */
1970                         else
1971                             ND_PRINT((ndo, "\n\t      %s", buf));
1972                         break;
1973                     case (AFNUM_INET6<<8 | SAFNUM_VPNUNICAST):
1974                     case (AFNUM_INET6<<8 | SAFNUM_VPNMULTICAST):
1975                     case (AFNUM_INET6<<8 | SAFNUM_VPNUNIMULTICAST):
1976                         advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, sizeof(buf));
1977                         if (advance == -1)
1978                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
1979                         else if (advance == -2)
1980                             goto trunc;
1981                         else
1982                             ND_PRINT((ndo, "\n\t      %s", buf));
1983                         break;
1984                     case (AFNUM_VPLS<<8 | SAFNUM_VPLS):
1985                     case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNICAST):
1986                     case (AFNUM_L2VPN<<8 | SAFNUM_VPNMULTICAST):
1987                     case (AFNUM_L2VPN<<8 | SAFNUM_VPNUNIMULTICAST):
1988                         advance = decode_labeled_vpn_l2(ndo, tptr, buf, sizeof(buf));
1989                         if (advance == -1)
1990                             ND_PRINT((ndo, "\n\t    (illegal length)"));
1991                         else if (advance == -2)
1992                             goto trunc;
1993                         else
1994                             ND_PRINT((ndo, "\n\t      %s", buf));
1995                         break;
1996                     case (AFNUM_NSAP<<8 | SAFNUM_UNICAST):
1997                     case (AFNUM_NSAP<<8 | SAFNUM_MULTICAST):
1998                     case (AFNUM_NSAP<<8 | SAFNUM_UNIMULTICAST):
1999                         advance = decode_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2000                         if (advance == -1)
2001                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
2002                         else if (advance == -2)
2003                             goto trunc;
2004                         else
2005                             ND_PRINT((ndo, "\n\t      %s", buf));
2006                         break;
2007                     case (AFNUM_NSAP<<8 | SAFNUM_VPNUNICAST):
2008                     case (AFNUM_NSAP<<8 | SAFNUM_VPNMULTICAST):
2009                     case (AFNUM_NSAP<<8 | SAFNUM_VPNUNIMULTICAST):
2010                         advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, sizeof(buf));
2011                         if (advance == -1)
2012                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
2013                         else if (advance == -2)
2014                             goto trunc;
2015                         else
2016                             ND_PRINT((ndo, "\n\t      %s", buf));
2017                         break;
2018                     case (AFNUM_INET<<8 | SAFNUM_MDT):
2019                       advance = decode_mdt_vpn_nlri(ndo, tptr, buf, sizeof(buf));
2020                       if (advance == -1)
2021                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
2022                         else if (advance == -2)
2023                             goto trunc;
2024                         else
2025                             ND_PRINT((ndo, "\n\t      %s", buf));
2026                        break;
2027                     case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
2028                     case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
2029                         advance = decode_multicast_vpn(ndo, tptr, buf, sizeof(buf));
2030                         if (advance == -1)
2031                             ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
2032                         else if (advance == -2)
2033                             goto trunc;
2034                         else
2035                             ND_PRINT((ndo, "\n\t      %s", buf));
2036                         break;
2037                     default:
2038                         ND_TCHECK2(*(tptr-3),tlen);
2039                         ND_PRINT((ndo, "no AFI %u / SAFI %u decoder", af, safi));
2040                         if (ndo->ndo_vflag <= 1)
2041                             print_unknown_data(ndo, tptr-3, "\n\t    ", tlen);
2042                         advance = 0;
2043                         tptr = pptr + len;
2044                         break;
2045                     }
2046                     if (advance < 0)
2047                         break;
2048                     tptr += advance;
2049                 }
2050                 break;
2051         case BGPTYPE_EXTD_COMMUNITIES:
2052                 if (len % 8) {
2053                         ND_PRINT((ndo, "invalid len"));
2054                         break;
2055                 }
2056                 while (tlen>0) {
2057                     uint16_t extd_comm;
2058
2059                     ND_TCHECK2(tptr[0], 2);
2060                     extd_comm=EXTRACT_16BITS(tptr);
2061
2062                     ND_PRINT((ndo, "\n\t    %s (0x%04x), Flags [%s]",
2063                            tok2str(bgp_extd_comm_subtype_values,
2064                                       "unknown extd community typecode",
2065                                       extd_comm),
2066                            extd_comm,
2067                            bittok2str(bgp_extd_comm_flag_values, "none", extd_comm)));
2068
2069                     ND_TCHECK2(*(tptr+2), 6);
2070                     switch(extd_comm) {
2071                     case BGP_EXT_COM_RT_0:
2072                     case BGP_EXT_COM_RO_0:
2073                     case BGP_EXT_COM_L2VPN_RT_0:
2074                         ND_PRINT((ndo, ": %u:%u (= %s)",
2075                                EXTRACT_16BITS(tptr+2),
2076                                EXTRACT_32BITS(tptr+4),
2077                                ipaddr_string(ndo, tptr+4)));
2078                         break;
2079                     case BGP_EXT_COM_RT_1:
2080                     case BGP_EXT_COM_RO_1:
2081                     case BGP_EXT_COM_L2VPN_RT_1:
2082                     case BGP_EXT_COM_VRF_RT_IMP:
2083                         ND_PRINT((ndo, ": %s:%u",
2084                                ipaddr_string(ndo, tptr+2),
2085                                EXTRACT_16BITS(tptr+6)));
2086                         break;
2087                     case BGP_EXT_COM_RT_2:
2088                     case BGP_EXT_COM_RO_2:
2089                         ND_PRINT((ndo, ": %s:%u",
2090                             as_printf(ndo, astostr, sizeof(astostr),
2091                             EXTRACT_32BITS(tptr+2)), EXTRACT_16BITS(tptr+6)));
2092                         break;
2093                     case BGP_EXT_COM_LINKBAND:
2094                         bw.i = EXTRACT_32BITS(tptr+2);
2095                         ND_PRINT((ndo, ": bandwidth: %.3f Mbps",
2096                                bw.f*8/1000000));
2097                         break;
2098                     case BGP_EXT_COM_VPN_ORIGIN:
2099                     case BGP_EXT_COM_VPN_ORIGIN2:
2100                     case BGP_EXT_COM_VPN_ORIGIN3:
2101                     case BGP_EXT_COM_VPN_ORIGIN4:
2102                     case BGP_EXT_COM_OSPF_RID:
2103                     case BGP_EXT_COM_OSPF_RID2:
2104                         ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr+2)));
2105                         break;
2106                     case BGP_EXT_COM_OSPF_RTYPE:
2107                     case BGP_EXT_COM_OSPF_RTYPE2:
2108                         ND_PRINT((ndo, ": area:%s, router-type:%s, metric-type:%s%s",
2109                                ipaddr_string(ndo, tptr+2),
2110                                tok2str(bgp_extd_comm_ospf_rtype_values,
2111                                           "unknown (0x%02x)",
2112                                           *(tptr+6)),
2113                                (*(tptr+7) &  BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
2114                                ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : ""));
2115                         break;
2116                     case BGP_EXT_COM_L2INFO:
2117                         ND_PRINT((ndo, ": %s Control Flags [0x%02x]:MTU %u",
2118                                tok2str(l2vpn_encaps_values,
2119                                           "unknown encaps",
2120                                           *(tptr+2)),
2121                                        *(tptr+3),
2122                                EXTRACT_16BITS(tptr+4)));
2123                         break;
2124                     case BGP_EXT_COM_SOURCE_AS:
2125                         ND_PRINT((ndo, ": AS %u", EXTRACT_16BITS(tptr+2)));
2126                         break;
2127                     default:
2128                         ND_TCHECK2(*tptr,8);
2129                         print_unknown_data(ndo, tptr, "\n\t      ", 8);
2130                         break;
2131                     }
2132                     tlen -=8;
2133                     tptr +=8;
2134                 }
2135                 break;
2136
2137         case BGPTYPE_PMSI_TUNNEL:
2138         {
2139                 uint8_t tunnel_type, flags;
2140
2141                 ND_TCHECK2(tptr[0], 5);
2142                 tunnel_type = *(tptr+1);
2143                 flags = *tptr;
2144                 tlen = len;
2145
2146                 ND_PRINT((ndo, "\n\t    Tunnel-type %s (%u), Flags [%s], MPLS Label %u",
2147                        tok2str(bgp_pmsi_tunnel_values, "Unknown", tunnel_type),
2148                        tunnel_type,
2149                        bittok2str(bgp_pmsi_flag_values, "none", flags),
2150                        EXTRACT_24BITS(tptr+2)>>4));
2151
2152                 tptr +=5;
2153                 tlen -= 5;
2154
2155                 switch (tunnel_type) {
2156                 case BGP_PMSI_TUNNEL_PIM_SM: /* fall through */
2157                 case BGP_PMSI_TUNNEL_PIM_BIDIR:
2158                     ND_TCHECK2(tptr[0], 8);
2159                     ND_PRINT((ndo, "\n\t      Sender %s, P-Group %s",
2160                            ipaddr_string(ndo, tptr),
2161                            ipaddr_string(ndo, tptr+4)));
2162                     break;
2163
2164                 case BGP_PMSI_TUNNEL_PIM_SSM:
2165                     ND_TCHECK2(tptr[0], 8);
2166                     ND_PRINT((ndo, "\n\t      Root-Node %s, P-Group %s",
2167                            ipaddr_string(ndo, tptr),
2168                            ipaddr_string(ndo, tptr+4)));
2169                     break;
2170                 case BGP_PMSI_TUNNEL_INGRESS:
2171                     ND_TCHECK2(tptr[0], 4);
2172                     ND_PRINT((ndo, "\n\t      Tunnel-Endpoint %s",
2173                            ipaddr_string(ndo, tptr)));
2174                     break;
2175                 case BGP_PMSI_TUNNEL_LDP_P2MP: /* fall through */
2176                 case BGP_PMSI_TUNNEL_LDP_MP2MP:
2177                     ND_TCHECK2(tptr[0], 8);
2178                     ND_PRINT((ndo, "\n\t      Root-Node %s, LSP-ID 0x%08x",
2179                            ipaddr_string(ndo, tptr),
2180                            EXTRACT_32BITS(tptr+4)));
2181                     break;
2182                 case BGP_PMSI_TUNNEL_RSVP_P2MP:
2183                     ND_TCHECK2(tptr[0], 8);
2184                     ND_PRINT((ndo, "\n\t      Extended-Tunnel-ID %s, P2MP-ID 0x%08x",
2185                            ipaddr_string(ndo, tptr),
2186                            EXTRACT_32BITS(tptr+4)));
2187                     break;
2188                 default:
2189                     if (ndo->ndo_vflag <= 1) {
2190                         print_unknown_data(ndo, tptr, "\n\t      ", tlen);
2191                     }
2192                 }
2193                 break;
2194         }
2195         case BGPTYPE_AIGP:
2196         {
2197                 uint8_t type;
2198                 uint16_t length;
2199
2200                 tlen = len;
2201
2202                 while (tlen >= 3) {
2203
2204                     ND_TCHECK2(tptr[0], 3);
2205
2206                     type = *tptr;
2207                     length = EXTRACT_16BITS(tptr+1);
2208                     tptr += 3;
2209                     tlen -= 3;
2210
2211                     ND_PRINT((ndo, "\n\t    %s TLV (%u), length %u",
2212                               tok2str(bgp_aigp_values, "Unknown", type),
2213                               type, length));
2214
2215                     if (length < 3)
2216                         goto trunc;
2217                     length -= 3;
2218
2219                     /*
2220                      * Check if we can read the TLV data.
2221                      */
2222                     ND_TCHECK2(tptr[3], length);
2223
2224                     switch (type) {
2225
2226                     case BGP_AIGP_TLV:
2227                         if (length < 8)
2228                             goto trunc;
2229                         ND_PRINT((ndo, ", metric %" PRIu64,
2230                                   EXTRACT_64BITS(tptr)));
2231                         break;
2232
2233                     default:
2234                         if (ndo->ndo_vflag <= 1) {
2235                             print_unknown_data(ndo, tptr,"\n\t      ", length);
2236                         }
2237                     }
2238
2239                     tptr += length;
2240                     tlen -= length;
2241                 }
2242                 break;
2243         }
2244         case BGPTYPE_ATTR_SET:
2245                 ND_TCHECK2(tptr[0], 4);
2246                 if (len < 4)
2247                         goto trunc;
2248                 ND_PRINT((ndo, "\n\t    Origin AS: %s",
2249                     as_printf(ndo, astostr, sizeof(astostr), EXTRACT_32BITS(tptr))));
2250                 tptr+=4;
2251                 len -=4;
2252
2253                 while (len) {
2254                     u_int aflags, alenlen, alen;
2255
2256                     ND_TCHECK2(tptr[0], 2);
2257                     if (len < 2)
2258                         goto trunc;
2259                     aflags = *tptr;
2260                     atype = *(tptr + 1);
2261                     tptr += 2;
2262                     len -= 2;
2263                     alenlen = bgp_attr_lenlen(aflags, tptr);
2264                     ND_TCHECK2(tptr[0], alenlen);
2265                     if (len < alenlen)
2266                         goto trunc;
2267                     alen = bgp_attr_len(aflags, tptr);
2268                     tptr += alenlen;
2269                     len -= alenlen;
2270
2271                     ND_PRINT((ndo, "\n\t      %s (%u), length: %u",
2272                            tok2str(bgp_attr_values,
2273                                       "Unknown Attribute", atype),
2274                            atype,
2275                            alen));
2276
2277                     if (aflags) {
2278                         ND_PRINT((ndo, ", Flags [%s%s%s%s",
2279                                aflags & 0x80 ? "O" : "",
2280                                aflags & 0x40 ? "T" : "",
2281                                aflags & 0x20 ? "P" : "",
2282                                aflags & 0x10 ? "E" : ""));
2283                         if (aflags & 0xf)
2284                             ND_PRINT((ndo, "+%x", aflags & 0xf));
2285                         ND_PRINT((ndo, "]: "));
2286                     }
2287                     /* The protocol encoding per se allows ATTR_SET to be nested as many times
2288                      * as the message can accommodate. This printer used to be able to recurse
2289                      * into ATTR_SET contents until the stack exhaustion, but now there is a
2290                      * limit on that (if live protocol exchange goes that many levels deep,
2291                      * something is probably wrong anyway). Feel free to refine this value if
2292                      * you can find the spec with respective normative text.
2293                      */
2294                     if (attr_set_level == 10)
2295                         ND_PRINT((ndo, "(too many nested levels, not recursing)"));
2296                     else if (!bgp_attr_print(ndo, atype, tptr, alen, attr_set_level + 1))
2297                         return 0;
2298                     tptr += alen;
2299                     len -= alen;
2300                 }
2301                 break;
2302
2303         case BGPTYPE_LARGE_COMMUNITY:
2304                 if (len == 0 || len % 12) {
2305                         ND_PRINT((ndo, "invalid len"));
2306                         break;
2307                 }
2308                 ND_PRINT((ndo, "\n\t    "));
2309                 while (len > 0) {
2310                         ND_TCHECK2(*tptr, 12);
2311                         ND_PRINT((ndo, "%u:%u:%u%s",
2312                                  EXTRACT_32BITS(tptr),
2313                                  EXTRACT_32BITS(tptr + 4),
2314                                  EXTRACT_32BITS(tptr + 8),
2315                                  (len > 12) ? ", " : ""));
2316                         tptr += 12;
2317                         len -= 12;
2318                 }
2319                 break;
2320         default:
2321             ND_TCHECK2(*pptr,len);
2322             ND_PRINT((ndo, "\n\t    no Attribute %u decoder", atype)); /* we have no decoder for the attribute */
2323             if (ndo->ndo_vflag <= 1)
2324                 print_unknown_data(ndo, pptr, "\n\t    ", len);
2325             break;
2326         }
2327         if (ndo->ndo_vflag > 1 && len) { /* omit zero length attributes*/
2328             ND_TCHECK2(*pptr,len);
2329             print_unknown_data(ndo, pptr, "\n\t    ", len);
2330         }
2331         return 1;
2332
2333 trunc:
2334         return 0;
2335 }
2336
2337 static void
2338 bgp_capabilities_print(netdissect_options *ndo,
2339                        const u_char *opt, int caps_len)
2340 {
2341         int cap_type, cap_len, tcap_len, cap_offset;
2342         int i = 0;
2343
2344         while (i < caps_len) {
2345                 ND_TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
2346                 cap_type=opt[i];
2347                 cap_len=opt[i+1];
2348                 tcap_len=cap_len;
2349                 ND_PRINT((ndo, "\n\t      %s (%u), length: %u",
2350                        tok2str(bgp_capcode_values, "Unknown",
2351                                   cap_type),
2352                        cap_type,
2353                        cap_len));
2354                 ND_TCHECK2(opt[i+2], cap_len);
2355                 switch (cap_type) {
2356                 case BGP_CAPCODE_MP:
2357                     /* AFI (16 bits), Reserved (8 bits), SAFI (8 bits) */
2358                     ND_TCHECK_8BITS(opt + i + 5);
2359                     ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u)",
2360                            tok2str(af_values, "Unknown",
2361                                       EXTRACT_16BITS(opt+i+2)),
2362                            EXTRACT_16BITS(opt+i+2),
2363                            tok2str(bgp_safi_values, "Unknown",
2364                                       opt[i+5]),
2365                            opt[i+5]));
2366                     break;
2367                 case BGP_CAPCODE_RESTART:
2368                     /* Restart Flags (4 bits), Restart Time in seconds (12 bits) */
2369                     ND_TCHECK_16BITS(opt + i + 2);
2370                     ND_PRINT((ndo, "\n\t\tRestart Flags: [%s], Restart Time %us",
2371                            ((opt[i+2])&0x80) ? "R" : "none",
2372                            EXTRACT_16BITS(opt+i+2)&0xfff));
2373                     tcap_len-=2;
2374                     cap_offset=4;
2375                     while(tcap_len>=4) {
2376                         ND_TCHECK_8BITS(opt + i + cap_offset + 3);
2377                         ND_PRINT((ndo, "\n\t\t  AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
2378                                tok2str(af_values,"Unknown",
2379                                           EXTRACT_16BITS(opt+i+cap_offset)),
2380                                EXTRACT_16BITS(opt+i+cap_offset),
2381                                tok2str(bgp_safi_values,"Unknown",
2382                                           opt[i+cap_offset+2]),
2383                                opt[i+cap_offset+2],
2384                                ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" ));
2385                         tcap_len-=4;
2386                         cap_offset+=4;
2387                     }
2388                     break;
2389                 case BGP_CAPCODE_RR:
2390                 case BGP_CAPCODE_RR_CISCO:
2391                     break;
2392                 case BGP_CAPCODE_AS_NEW:
2393
2394                     /*
2395                      * Extract the 4 byte AS number encoded.
2396                      */
2397                     if (cap_len == 4) {
2398                         ND_PRINT((ndo, "\n\t\t 4 Byte AS %s",
2399                             as_printf(ndo, astostr, sizeof(astostr),
2400                             EXTRACT_32BITS(opt + i + 2))));
2401                     }
2402                     break;
2403                 case BGP_CAPCODE_ADD_PATH:
2404                     cap_offset=2;
2405                     if (tcap_len == 0) {
2406                         ND_PRINT((ndo, " (bogus)")); /* length */
2407                         break;
2408                     }
2409                     while (tcap_len > 0) {
2410                         if (tcap_len < 4) {
2411                             ND_PRINT((ndo, "\n\t\t(invalid)"));
2412                             break;
2413                         }
2414                         ND_PRINT((ndo, "\n\t\tAFI %s (%u), SAFI %s (%u), Send/Receive: %s",
2415                                   tok2str(af_values,"Unknown",EXTRACT_16BITS(opt+i+cap_offset)),
2416                                   EXTRACT_16BITS(opt+i+cap_offset),
2417                                   tok2str(bgp_safi_values,"Unknown",opt[i+cap_offset+2]),
2418                                   opt[i+cap_offset+2],
2419                                   tok2str(bgp_add_path_recvsend,"Bogus (0x%02x)",opt[i+cap_offset+3])
2420                         ));
2421                         tcap_len-=4;
2422                         cap_offset+=4;
2423                     }
2424                     break;
2425                 default:
2426                     ND_PRINT((ndo, "\n\t\tno decoder for Capability %u",
2427                            cap_type));
2428                     if (ndo->ndo_vflag <= 1)
2429                         print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2430                     break;
2431                 }
2432                 if (ndo->ndo_vflag > 1 && cap_len > 0) {
2433                     print_unknown_data(ndo, &opt[i+2], "\n\t\t", cap_len);
2434                 }
2435                 i += BGP_CAP_HEADER_SIZE + cap_len;
2436         }
2437         return;
2438
2439 trunc:
2440         ND_PRINT((ndo, "%s", tstr));
2441 }
2442
2443 static void
2444 bgp_open_print(netdissect_options *ndo,
2445                const u_char *dat, int length)
2446 {
2447         struct bgp_open bgpo;
2448         struct bgp_opt bgpopt;
2449         const u_char *opt;
2450         int i;
2451
2452         ND_TCHECK2(dat[0], BGP_OPEN_SIZE);
2453         memcpy(&bgpo, dat, BGP_OPEN_SIZE);
2454
2455         ND_PRINT((ndo, "\n\t  Version %d, ", bgpo.bgpo_version));
2456         ND_PRINT((ndo, "my AS %s, ",
2457             as_printf(ndo, astostr, sizeof(astostr), ntohs(bgpo.bgpo_myas))));
2458         ND_PRINT((ndo, "Holdtime %us, ", ntohs(bgpo.bgpo_holdtime)));
2459         ND_PRINT((ndo, "ID %s", ipaddr_string(ndo, &bgpo.bgpo_id)));
2460         ND_PRINT((ndo, "\n\t  Optional parameters, length: %u", bgpo.bgpo_optlen));
2461
2462         /* some little sanity checking */
2463         if (length < bgpo.bgpo_optlen+BGP_OPEN_SIZE)
2464             return;
2465
2466         /* ugly! */
2467         opt = &((const struct bgp_open *)dat)->bgpo_optlen;
2468         opt++;
2469
2470         i = 0;
2471         while (i < bgpo.bgpo_optlen) {
2472                 ND_TCHECK2(opt[i], BGP_OPT_SIZE);
2473                 memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
2474                 if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
2475                         ND_PRINT((ndo, "\n\t     Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len));
2476                         break;
2477                 }
2478
2479                 ND_PRINT((ndo, "\n\t    Option %s (%u), length: %u",
2480                        tok2str(bgp_opt_values,"Unknown",
2481                                   bgpopt.bgpopt_type),
2482                        bgpopt.bgpopt_type,
2483                        bgpopt.bgpopt_len));
2484
2485                 /* now let's decode the options we know*/
2486                 switch(bgpopt.bgpopt_type) {
2487
2488                 case BGP_OPT_CAP:
2489                         bgp_capabilities_print(ndo, &opt[i+BGP_OPT_SIZE],
2490                             bgpopt.bgpopt_len);
2491                         break;
2492
2493                 case BGP_OPT_AUTH:
2494                 default:
2495                        ND_PRINT((ndo, "\n\t      no decoder for option %u",
2496                            bgpopt.bgpopt_type));
2497                        break;
2498                 }
2499                 i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
2500         }
2501         return;
2502 trunc:
2503         ND_PRINT((ndo, "%s", tstr));
2504 }
2505
2506 static void
2507 bgp_update_print(netdissect_options *ndo,
2508                  const u_char *dat, int length)
2509 {
2510         struct bgp bgp;
2511         const u_char *p;
2512         int withdrawn_routes_len;
2513         int len;
2514         int i;
2515
2516         ND_TCHECK2(dat[0], BGP_SIZE);
2517         if (length < BGP_SIZE)
2518                 goto trunc;
2519         memcpy(&bgp, dat, BGP_SIZE);
2520         p = dat + BGP_SIZE;     /*XXX*/
2521         length -= BGP_SIZE;
2522
2523         /* Unfeasible routes */
2524         ND_TCHECK2(p[0], 2);
2525         if (length < 2)
2526                 goto trunc;
2527         withdrawn_routes_len = EXTRACT_16BITS(p);
2528         p += 2;
2529         length -= 2;
2530         if (withdrawn_routes_len) {
2531                 /*
2532                  * Without keeping state from the original NLRI message,
2533                  * it's not possible to tell if this a v4 or v6 route,
2534                  * so only try to decode it if we're not v6 enabled.
2535                  */
2536                 ND_TCHECK2(p[0], withdrawn_routes_len);
2537                 if (length < withdrawn_routes_len)
2538                         goto trunc;
2539                 ND_PRINT((ndo, "\n\t  Withdrawn routes: %d bytes", withdrawn_routes_len));
2540                 p += withdrawn_routes_len;
2541                 length -= withdrawn_routes_len;
2542         }
2543
2544         ND_TCHECK2(p[0], 2);
2545         if (length < 2)
2546                 goto trunc;
2547         len = EXTRACT_16BITS(p);
2548         p += 2;
2549         length -= 2;
2550
2551         if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
2552             /* No withdrawn routes, no path attributes, no NLRI */
2553             ND_PRINT((ndo, "\n\t  End-of-Rib Marker (empty NLRI)"));
2554             return;
2555         }
2556
2557         if (len) {
2558                 /* do something more useful!*/
2559                 while (len) {
2560                         int aflags, atype, alenlen, alen;
2561
2562                         ND_TCHECK2(p[0], 2);
2563                         if (len < 2)
2564                             goto trunc;
2565                         if (length < 2)
2566                             goto trunc;
2567                         aflags = *p;
2568                         atype = *(p + 1);
2569                         p += 2;
2570                         len -= 2;
2571                         length -= 2;
2572                         alenlen = bgp_attr_lenlen(aflags, p);
2573                         ND_TCHECK2(p[0], alenlen);
2574                         if (len < alenlen)
2575                             goto trunc;
2576                         if (length < alenlen)
2577                             goto trunc;
2578                         alen = bgp_attr_len(aflags, p);
2579                         p += alenlen;
2580                         len -= alenlen;
2581                         length -= alenlen;
2582
2583                         ND_PRINT((ndo, "\n\t  %s (%u), length: %u",
2584                               tok2str(bgp_attr_values, "Unknown Attribute",
2585                                          atype),
2586                               atype,
2587                               alen));
2588
2589                         if (aflags) {
2590                                 ND_PRINT((ndo, ", Flags [%s%s%s%s",
2591                                         aflags & 0x80 ? "O" : "",
2592                                         aflags & 0x40 ? "T" : "",
2593                                         aflags & 0x20 ? "P" : "",
2594                                         aflags & 0x10 ? "E" : ""));
2595                                 if (aflags & 0xf)
2596                                         ND_PRINT((ndo, "+%x", aflags & 0xf));
2597                                 ND_PRINT((ndo, "]: "));
2598                         }
2599                         if (len < alen)
2600                                 goto trunc;
2601                         if (length < alen)
2602                                 goto trunc;
2603                         if (!bgp_attr_print(ndo, atype, p, alen, 0))
2604                                 goto trunc;
2605                         p += alen;
2606                         len -= alen;
2607                         length -= alen;
2608                 }
2609         }
2610
2611         if (length) {
2612                 /*
2613                  * XXX - what if they're using the "Advertisement of
2614                  * Multiple Paths in BGP" feature:
2615                  *
2616                  * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
2617                  *
2618                  * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
2619                  */
2620                 ND_PRINT((ndo, "\n\t  Updated routes:"));
2621                 while (length) {
2622                         char buf[MAXHOSTNAMELEN + 100];
2623                         i = decode_prefix4(ndo, p, length, buf, sizeof(buf));
2624                         if (i == -1) {
2625                                 ND_PRINT((ndo, "\n\t    (illegal prefix length)"));
2626                                 break;
2627                         } else if (i == -2)
2628                                 goto trunc;
2629                         else if (i == -3)
2630                                 goto trunc; /* bytes left, but not enough */
2631                         else {
2632                                 ND_PRINT((ndo, "\n\t    %s", buf));
2633                                 p += i;
2634                                 length -= i;
2635                         }
2636                 }
2637         }
2638         return;
2639 trunc:
2640         ND_PRINT((ndo, "%s", tstr));
2641 }
2642
2643 static void
2644 bgp_notification_print(netdissect_options *ndo,
2645                        const u_char *dat, int length)
2646 {
2647         struct bgp_notification bgpn;
2648         const u_char *tptr;
2649
2650         ND_TCHECK2(dat[0], BGP_NOTIFICATION_SIZE);
2651         memcpy(&bgpn, dat, BGP_NOTIFICATION_SIZE);
2652
2653         /* some little sanity checking */
2654         if (length<BGP_NOTIFICATION_SIZE)
2655             return;
2656
2657         ND_PRINT((ndo, ", %s (%u)",
2658                tok2str(bgp_notify_major_values, "Unknown Error",
2659                           bgpn.bgpn_major),
2660                bgpn.bgpn_major));
2661
2662         switch (bgpn.bgpn_major) {
2663
2664         case BGP_NOTIFY_MAJOR_MSG:
2665             ND_PRINT((ndo, ", subcode %s (%u)",
2666                    tok2str(bgp_notify_minor_msg_values, "Unknown",
2667                               bgpn.bgpn_minor),
2668                    bgpn.bgpn_minor));
2669             break;
2670         case BGP_NOTIFY_MAJOR_OPEN:
2671             ND_PRINT((ndo, ", subcode %s (%u)",
2672                    tok2str(bgp_notify_minor_open_values, "Unknown",
2673                               bgpn.bgpn_minor),
2674                    bgpn.bgpn_minor));
2675             break;
2676         case BGP_NOTIFY_MAJOR_UPDATE:
2677             ND_PRINT((ndo, ", subcode %s (%u)",
2678                    tok2str(bgp_notify_minor_update_values, "Unknown",
2679                               bgpn.bgpn_minor),
2680                    bgpn.bgpn_minor));
2681             break;
2682         case BGP_NOTIFY_MAJOR_FSM:
2683             ND_PRINT((ndo, " subcode %s (%u)",
2684                    tok2str(bgp_notify_minor_fsm_values, "Unknown",
2685                               bgpn.bgpn_minor),
2686                    bgpn.bgpn_minor));
2687             break;
2688         case BGP_NOTIFY_MAJOR_CAP:
2689             ND_PRINT((ndo, " subcode %s (%u)",
2690                    tok2str(bgp_notify_minor_cap_values, "Unknown",
2691                               bgpn.bgpn_minor),
2692                    bgpn.bgpn_minor));
2693             break;
2694         case BGP_NOTIFY_MAJOR_CEASE:
2695             ND_PRINT((ndo, ", subcode %s (%u)",
2696                    tok2str(bgp_notify_minor_cease_values, "Unknown",
2697                               bgpn.bgpn_minor),
2698                    bgpn.bgpn_minor));
2699
2700             /* draft-ietf-idr-cease-subcode-02 mentions optionally 7 bytes
2701              * for the maxprefix subtype, which may contain AFI, SAFI and MAXPREFIXES
2702              */
2703             if(bgpn.bgpn_minor == BGP_NOTIFY_MINOR_CEASE_MAXPRFX && length >= BGP_NOTIFICATION_SIZE + 7) {
2704                 tptr = dat + BGP_NOTIFICATION_SIZE;
2705                 ND_TCHECK2(*tptr, 7);
2706                 ND_PRINT((ndo, ", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
2707                        tok2str(af_values, "Unknown",
2708                                   EXTRACT_16BITS(tptr)),
2709                        EXTRACT_16BITS(tptr),
2710                        tok2str(bgp_safi_values, "Unknown", *(tptr+2)),
2711                        *(tptr+2),
2712                        EXTRACT_32BITS(tptr+3)));
2713             }
2714             break;
2715         default:
2716             break;
2717         }
2718
2719         return;
2720 trunc:
2721         ND_PRINT((ndo, "%s", tstr));
2722 }
2723
2724 static void
2725 bgp_route_refresh_print(netdissect_options *ndo,
2726                         const u_char *pptr, int len)
2727 {
2728         const struct bgp_route_refresh *bgp_route_refresh_header;
2729
2730         ND_TCHECK2(pptr[0], BGP_ROUTE_REFRESH_SIZE);
2731
2732         /* some little sanity checking */
2733         if (len<BGP_ROUTE_REFRESH_SIZE)
2734             return;
2735
2736         bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
2737
2738         ND_PRINT((ndo, "\n\t  AFI %s (%u), SAFI %s (%u)",
2739                tok2str(af_values,"Unknown",
2740                           /* this stinks but the compiler pads the structure
2741                            * weird */
2742                           EXTRACT_16BITS(&bgp_route_refresh_header->afi)),
2743                EXTRACT_16BITS(&bgp_route_refresh_header->afi),
2744                tok2str(bgp_safi_values,"Unknown",
2745                           bgp_route_refresh_header->safi),
2746                bgp_route_refresh_header->safi));
2747
2748         if (ndo->ndo_vflag > 1) {
2749             ND_TCHECK2(*pptr, len);
2750             print_unknown_data(ndo, pptr, "\n\t  ", len);
2751         }
2752
2753         return;
2754 trunc:
2755         ND_PRINT((ndo, "%s", tstr));
2756 }
2757
2758 static int
2759 bgp_header_print(netdissect_options *ndo,
2760                  const u_char *dat, int length)
2761 {
2762         struct bgp bgp;
2763
2764         ND_TCHECK2(dat[0], BGP_SIZE);
2765         memcpy(&bgp, dat, BGP_SIZE);
2766         ND_PRINT((ndo, "\n\t%s Message (%u), length: %u",
2767                tok2str(bgp_msg_values, "Unknown", bgp.bgp_type),
2768                bgp.bgp_type,
2769                length));
2770
2771         switch (bgp.bgp_type) {
2772         case BGP_OPEN:
2773                 bgp_open_print(ndo, dat, length);
2774                 break;
2775         case BGP_UPDATE:
2776                 bgp_update_print(ndo, dat, length);
2777                 break;
2778         case BGP_NOTIFICATION:
2779                 bgp_notification_print(ndo, dat, length);
2780                 break;
2781         case BGP_KEEPALIVE:
2782                 break;
2783         case BGP_ROUTE_REFRESH:
2784                 bgp_route_refresh_print(ndo, dat, length);
2785                 break;
2786         default:
2787                 /* we have no decoder for the BGP message */
2788                 ND_TCHECK2(*dat, length);
2789                 ND_PRINT((ndo, "\n\t  no Message %u decoder", bgp.bgp_type));
2790                 print_unknown_data(ndo, dat, "\n\t  ", length);
2791                 break;
2792         }
2793         return 1;
2794 trunc:
2795         ND_PRINT((ndo, "%s", tstr));
2796         return 0;
2797 }
2798
2799 void
2800 bgp_print(netdissect_options *ndo,
2801           const u_char *dat, int length)
2802 {
2803         const u_char *p;
2804         const u_char *ep;
2805         const u_char *start;
2806         const u_char marker[] = {
2807                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2808                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
2809         };
2810         struct bgp bgp;
2811         uint16_t hlen;
2812
2813         ep = dat + length;
2814         if (ndo->ndo_snapend < dat + length)
2815                 ep = ndo->ndo_snapend;
2816
2817         ND_PRINT((ndo, ": BGP"));
2818
2819         if (ndo->ndo_vflag < 1) /* lets be less chatty */
2820                 return;
2821
2822         p = dat;
2823         start = p;
2824         while (p < ep) {
2825                 if (!ND_TTEST2(p[0], 1))
2826                         break;
2827                 if (p[0] != 0xff) {
2828                         p++;
2829                         continue;
2830                 }
2831
2832                 if (!ND_TTEST2(p[0], sizeof(marker)))
2833                         break;
2834                 if (memcmp(p, marker, sizeof(marker)) != 0) {
2835                         p++;
2836                         continue;
2837                 }
2838
2839                 /* found BGP header */
2840                 ND_TCHECK2(p[0], BGP_SIZE);     /*XXX*/
2841                 memcpy(&bgp, p, BGP_SIZE);
2842
2843                 if (start != p)
2844                         ND_PRINT((ndo, " %s", tstr));
2845
2846                 hlen = ntohs(bgp.bgp_len);
2847                 if (hlen < BGP_SIZE) {
2848                         ND_PRINT((ndo, "\n[|BGP Bogus header length %u < %u]", hlen,
2849                             BGP_SIZE));
2850                         break;
2851                 }
2852
2853                 if (ND_TTEST2(p[0], hlen)) {
2854                         if (!bgp_header_print(ndo, p, hlen))
2855                                 return;
2856                         p += hlen;
2857                         start = p;
2858                 } else {
2859                         ND_PRINT((ndo, "\n[|BGP %s]",
2860                                tok2str(bgp_msg_values,
2861                                           "Unknown Message Type",
2862                                           bgp.bgp_type)));
2863                         break;
2864                 }
2865         }
2866
2867         return;
2868
2869 trunc:
2870         ND_PRINT((ndo, "%s", tstr));
2871 }
2872
2873 /*
2874  * Local Variables:
2875  * c-style: whitesmith
2876  * c-basic-offset: 4
2877  * End:
2878  */