The Tcpdump Group git mirrors - tcpdump/blob - print-isoclns.c

   1 /*
   2  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Original code by Matt Thomas, Digital Equipment Corporation
  22  *
  23  * Extensively modified by Hannes Gredler (hannes@juniper.net) for more
  24  * complete IS-IS & CLNP support.
  25  */
  26
  27 #ifndef lint
  28 static const char rcsid[] _U_ =
  29     "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.141 2005-05-25 22:06:24 guy Exp $ (LBL)";
  30 #endif
  31
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35
  36 #include <tcpdump-stdinc.h>
  37
  38 #include <stdio.h>
  39 #include <string.h>
  40
  41 #include "interface.h"
  42 #include "addrtoname.h"
  43 #include "ethertype.h"
  44 #include "ether.h"
  45 #include "nlpid.h"
  46 #include "extract.h"
  47 #include "gmpls.h"
  48 #include "oui.h"
  49
  50 #define IPV4            1       /* AFI value */
  51 #define IPV6            2       /* AFI value */
  52
  53 /*
  54  * IS-IS is defined in ISO 10589.  Look there for protocol definitions.
  55  */
  56
  57 #define SYSTEM_ID_LEN   ETHER_ADDR_LEN
  58 #define NODE_ID_LEN     SYSTEM_ID_LEN+1
  59 #define LSP_ID_LEN      SYSTEM_ID_LEN+2
  60
  61 #define ISIS_VERSION    1
  62 #define ESIS_VERSION    1
  63 #define CLNP_VERSION    1
  64
  65 #define ISIS_PDU_TYPE_MASK      0x1F
  66 #define ESIS_PDU_TYPE_MASK      0x1F
  67 #define CLNP_PDU_TYPE_MASK      0x1F
  68 #define CLNP_FLAG_MASK          0xE0
  69 #define ISIS_LAN_PRIORITY_MASK  0x7F
  70
  71 #define ISIS_PDU_L1_LAN_IIH     15
  72 #define ISIS_PDU_L2_LAN_IIH     16
  73 #define ISIS_PDU_PTP_IIH        17
  74 #define ISIS_PDU_L1_LSP         18
  75 #define ISIS_PDU_L2_LSP         20
  76 #define ISIS_PDU_L1_CSNP        24
  77 #define ISIS_PDU_L2_CSNP        25
  78 #define ISIS_PDU_L1_PSNP        26
  79 #define ISIS_PDU_L2_PSNP        27
  80
  81 static struct tok isis_pdu_values[] = {
  82     { ISIS_PDU_L1_LAN_IIH,       "L1 Lan IIH"},
  83     { ISIS_PDU_L2_LAN_IIH,       "L2 Lan IIH"},
  84     { ISIS_PDU_PTP_IIH,          "p2p IIH"},
  85     { ISIS_PDU_L1_LSP,           "L1 LSP"},
  86     { ISIS_PDU_L2_LSP,           "L2 LSP"},
  87     { ISIS_PDU_L1_CSNP,          "L1 CSNP"},
  88     { ISIS_PDU_L2_CSNP,          "L2 CSNP"},
  89     { ISIS_PDU_L1_PSNP,          "L1 PSNP"},
  90     { ISIS_PDU_L2_PSNP,          "L2 PSNP"},
  91     { 0, NULL}
  92 };
  93
  94 /*
  95  * A TLV is a tuple of a type, length and a value and is normally used for
  96  * encoding information in all sorts of places.  This is an enumeration of
  97  * the well known types.
  98  *
  99  * list taken from rfc3359 plus some memory from veterans ;-)
 100  */
 101
 102 #define ISIS_TLV_AREA_ADDR           1   /* iso10589 */
 103 #define ISIS_TLV_IS_REACH            2   /* iso10589 */
 104 #define ISIS_TLV_ESNEIGH             3   /* iso10589 */
 105 #define ISIS_TLV_PART_DIS            4   /* iso10589 */
 106 #define ISIS_TLV_PREFIX_NEIGH        5   /* iso10589 */
 107 #define ISIS_TLV_ISNEIGH             6   /* iso10589 */
 108 #define ISIS_TLV_ISNEIGH_VARLEN      7   /* iso10589 */
 109 #define ISIS_TLV_PADDING             8   /* iso10589 */
 110 #define ISIS_TLV_LSP                 9   /* iso10589 */
 111 #define ISIS_TLV_AUTH                10  /* iso10589, rfc3567 */
 112 #define ISIS_TLV_CHECKSUM            12  /* rfc3358 */
 113 #define ISIS_TLV_LSP_BUFFERSIZE      14  /* iso10589 rev2 */
 114 #define ISIS_TLV_EXT_IS_REACH        22  /* draft-ietf-isis-traffic-05 */
 115 #define ISIS_TLV_IS_ALIAS_ID         24  /* draft-ietf-isis-ext-lsp-frags-02 */
 116 #define ISIS_TLV_DECNET_PHASE4       42
 117 #define ISIS_TLV_LUCENT_PRIVATE      66
 118 #define ISIS_TLV_INT_IP_REACH        128 /* rfc1195, rfc2966 */
 119 #define ISIS_TLV_PROTOCOLS           129 /* rfc1195 */
 120 #define ISIS_TLV_EXT_IP_REACH        130 /* rfc1195, rfc2966 */
 121 #define ISIS_TLV_IDRP_INFO           131 /* rfc1195 */
 122 #define ISIS_TLV_IPADDR              132 /* rfc1195 */
 123 #define ISIS_TLV_IPAUTH              133 /* rfc1195 */
 124 #define ISIS_TLV_TE_ROUTER_ID        134 /* draft-ietf-isis-traffic-05 */
 125 #define ISIS_TLV_EXTD_IP_REACH       135 /* draft-ietf-isis-traffic-05 */
 126 #define ISIS_TLV_HOSTNAME            137 /* rfc2763 */
 127 #define ISIS_TLV_SHARED_RISK_GROUP   138 /* draft-ietf-isis-gmpls-extensions */
 128 #define ISIS_TLV_NORTEL_PRIVATE1     176
 129 #define ISIS_TLV_NORTEL_PRIVATE2     177
 130 #define ISIS_TLV_RESTART_SIGNALING   211 /* draft-ietf-isis-restart-01 */
 131 #define ISIS_TLV_MT_IS_REACH         222 /* draft-ietf-isis-wg-multi-topology-05 */
 132 #define ISIS_TLV_MT_SUPPORTED        229 /* draft-ietf-isis-wg-multi-topology-05 */
 133 #define ISIS_TLV_IP6ADDR             232 /* draft-ietf-isis-ipv6-02 */
 134 #define ISIS_TLV_MT_IP_REACH         235 /* draft-ietf-isis-wg-multi-topology-05 */
 135 #define ISIS_TLV_IP6_REACH           236 /* draft-ietf-isis-ipv6-02 */
 136 #define ISIS_TLV_MT_IP6_REACH        237 /* draft-ietf-isis-wg-multi-topology-05 */
 137 #define ISIS_TLV_PTP_ADJ             240 /* rfc3373 */
 138 #define ISIS_TLV_IIH_SEQNR           241 /* draft-shen-isis-iih-sequence-00 */
 139 #define ISIS_TLV_VENDOR_PRIVATE      250 /* draft-ietf-isis-experimental-tlv-01 */
 140
 141 static struct tok isis_tlv_values[] = {
 142     { ISIS_TLV_AREA_ADDR,          "Area address(es)"},
 143     { ISIS_TLV_IS_REACH,           "IS Reachability"},
 144     { ISIS_TLV_ESNEIGH,            "ES Neighbor(s)"},
 145     { ISIS_TLV_PART_DIS,           "Partition DIS"},
 146     { ISIS_TLV_PREFIX_NEIGH,       "Prefix Neighbors"},
 147     { ISIS_TLV_ISNEIGH,            "IS Neighbor(s)"},
 148     { ISIS_TLV_ISNEIGH_VARLEN,     "IS Neighbor(s) (variable length)"},
 149     { ISIS_TLV_PADDING,            "Padding"},
 150     { ISIS_TLV_LSP,                "LSP entries"},
 151     { ISIS_TLV_AUTH,               "Authentication"},
 152     { ISIS_TLV_CHECKSUM,           "Checksum"},
 153     { ISIS_TLV_LSP_BUFFERSIZE,     "LSP Buffersize"},
 154     { ISIS_TLV_EXT_IS_REACH,       "Extended IS Reachability"},
 155     { ISIS_TLV_IS_ALIAS_ID,        "IS Alias ID"},
 156     { ISIS_TLV_DECNET_PHASE4,      "DECnet Phase IV"},
 157     { ISIS_TLV_LUCENT_PRIVATE,     "Lucent Proprietary"},
 158     { ISIS_TLV_INT_IP_REACH,       "IPv4 Internal Reachability"},
 159     { ISIS_TLV_PROTOCOLS,          "Protocols supported"},
 160     { ISIS_TLV_EXT_IP_REACH,       "IPv4 External Reachability"},
 161     { ISIS_TLV_IDRP_INFO,          "Inter-Domain Information Type"},
 162     { ISIS_TLV_IPADDR,             "IPv4 Interface address(es)"},
 163     { ISIS_TLV_IPAUTH,             "IPv4 authentication (deprecated)"},
 164     { ISIS_TLV_TE_ROUTER_ID,       "Traffic Engineering Router ID"},
 165     { ISIS_TLV_EXTD_IP_REACH,      "Extended IPv4 Reachability"},
 166     { ISIS_TLV_SHARED_RISK_GROUP,  "Shared Risk Link Group"},
 167     { ISIS_TLV_NORTEL_PRIVATE1,    "Nortel Proprietary"},
 168     { ISIS_TLV_NORTEL_PRIVATE2,    "Nortel Proprietary"},
 169     { ISIS_TLV_HOSTNAME,           "Hostname"},
 170     { ISIS_TLV_RESTART_SIGNALING,  "Restart Signaling"},
 171     { ISIS_TLV_MT_IS_REACH,        "Multi Topology IS Reachability"},
 172     { ISIS_TLV_MT_SUPPORTED,       "Multi Topology"},
 173     { ISIS_TLV_IP6ADDR,            "IPv6 Interface address(es)"},
 174     { ISIS_TLV_MT_IP_REACH,        "Multi-Topology IPv4 Reachability"},
 175     { ISIS_TLV_IP6_REACH,          "IPv6 reachability"},
 176     { ISIS_TLV_MT_IP6_REACH,       "Multi-Topology IP6 Reachability"},
 177     { ISIS_TLV_PTP_ADJ,            "Point-to-point Adjacency State"},
 178     { ISIS_TLV_IIH_SEQNR,          "Hello PDU Sequence Number"},
 179     { ISIS_TLV_VENDOR_PRIVATE,     "Vendor Private"},
 180     { 0, NULL }
 181 };
 182
 183 #define ESIS_OPTION_PROTOCOLS        129
 184 #define ESIS_OPTION_QOS_MAINTENANCE  195 /* iso9542 */
 185 #define ESIS_OPTION_SECURITY         197 /* iso9542 */
 186 #define ESIS_OPTION_ES_CONF_TIME     198 /* iso9542 */
 187 #define ESIS_OPTION_PRIORITY         205 /* iso9542 */
 188 #define ESIS_OPTION_ADDRESS_MASK     225 /* iso9542 */
 189 #define ESIS_OPTION_SNPA_MASK        226 /* iso9542 */
 190
 191 static struct tok esis_option_values[] = {
 192     { ESIS_OPTION_PROTOCOLS,       "Protocols supported"},
 193     { ESIS_OPTION_QOS_MAINTENANCE, "QoS Maintenance" },
 194     { ESIS_OPTION_SECURITY,        "Security" },
 195     { ESIS_OPTION_ES_CONF_TIME,    "ES Configuration Time" },
 196     { ESIS_OPTION_PRIORITY,        "Priority" },
 197     { ESIS_OPTION_ADDRESS_MASK,    "Addressk Mask" },
 198     { ESIS_OPTION_SNPA_MASK,       "SNPA Mask" },
 199     { 0, NULL }
 200 };
 201
 202 #define CLNP_OPTION_DISCARD_REASON   193
 203 #define CLNP_OPTION_QOS_MAINTENANCE  195 /* iso8473 */
 204 #define CLNP_OPTION_SECURITY         197 /* iso8473 */
 205 #define CLNP_OPTION_SOURCE_ROUTING   200 /* iso8473 */
 206 #define CLNP_OPTION_ROUTE_RECORDING  203 /* iso8473 */
 207 #define CLNP_OPTION_PADDING          204 /* iso8473 */
 208 #define CLNP_OPTION_PRIORITY         205 /* iso8473 */
 209
 210 static struct tok clnp_option_values[] = {
 211     { CLNP_OPTION_DISCARD_REASON,  "Discard Reason"},
 212     { CLNP_OPTION_PRIORITY,        "Priority"},
 213     { CLNP_OPTION_QOS_MAINTENANCE, "QoS Maintenance"},
 214     { CLNP_OPTION_SECURITY, "Security"},
 215     { CLNP_OPTION_SOURCE_ROUTING, "Source Routing"},
 216     { CLNP_OPTION_ROUTE_RECORDING, "Route Recording"},
 217     { CLNP_OPTION_PADDING, "Padding"},
 218     { 0, NULL }
 219 };
 220
 221 static struct tok clnp_option_rfd_class_values[] = {
 222     { 0x0, "General"},
 223     { 0x8, "Address"},
 224     { 0x9, "Source Routeing"},
 225     { 0xa, "Lifetime"},
 226     { 0xb, "PDU Discarded"},
 227     { 0xc, "Reassembly"},
 228     { 0, NULL }
 229 };
 230
 231 static struct tok clnp_option_rfd_general_values[] = {
 232     { 0x0, "Reason not specified"},
 233     { 0x1, "Protocol procedure error"},
 234     { 0x2, "Incorrect checksum"},
 235     { 0x3, "PDU discarded due to congestion"},
 236     { 0x4, "Header syntax error (cannot be parsed)"},
 237     { 0x5, "Segmentation needed but not permitted"},
 238     { 0x6, "Incomplete PDU received"},
 239     { 0x7, "Duplicate option"},
 240     { 0, NULL }
 241 };
 242
 243 static struct tok clnp_option_rfd_address_values[] = {
 244     { 0x0, "Destination address unreachable"},
 245     { 0x1, "Destination address unknown"},
 246     { 0, NULL }
 247 };
 248
 249 static struct tok clnp_option_rfd_source_routeing_values[] = {
 250     { 0x0, "Unspecified source routeing error"},
 251     { 0x1, "Syntax error in source routeing field"},
 252     { 0x2, "Unknown address in source routeing field"},
 253     { 0x3, "Path not acceptable"},
 254     { 0, NULL }
 255 };
 256
 257 static struct tok clnp_option_rfd_lifetime_values[] = {
 258     { 0x0, "Lifetime expired while data unit in transit"},
 259     { 0x1, "Lifetime expired during reassembly"},
 260     { 0, NULL }
 261 };
 262
 263 static struct tok clnp_option_rfd_pdu_discard_values[] = {
 264     { 0x0, "Unsupported option not specified"},
 265     { 0x1, "Unsupported protocol version"},
 266     { 0x2, "Unsupported security option"},
 267     { 0x3, "Unsupported source routeing option"},
 268     { 0x4, "Unsupported recording of route option"},
 269     { 0, NULL }
 270 };
 271
 272 static struct tok clnp_option_rfd_reassembly_values[] = {
 273     { 0x0, "Reassembly interference"},
 274     { 0, NULL }
 275 };
 276
 277 /* array of 16 error-classes */
 278 static struct tok *clnp_option_rfd_error_class[] = {
 279     clnp_option_rfd_general_values,
 280     NULL,
 281     NULL,
 282     NULL,
 283     NULL,
 284     NULL,
 285     NULL,
 286     NULL,
 287     clnp_option_rfd_address_values,
 288     clnp_option_rfd_source_routeing_values,
 289     clnp_option_rfd_lifetime_values,
 290     clnp_option_rfd_pdu_discard_values,
 291     clnp_option_rfd_reassembly_values,
 292     NULL,
 293     NULL,
 294     NULL
 295 };
 296
 297 #define CLNP_OPTION_OPTION_QOS_MASK 0x3f
 298 #define CLNP_OPTION_SCOPE_MASK      0xc0
 299 #define CLNP_OPTION_SCOPE_SA_SPEC   0x40
 300 #define CLNP_OPTION_SCOPE_DA_SPEC   0x80
 301 #define CLNP_OPTION_SCOPE_GLOBAL    0xc0
 302
 303 static struct tok clnp_option_scope_values[] = {
 304     { CLNP_OPTION_SCOPE_SA_SPEC, "Source Address Specific"},
 305     { CLNP_OPTION_SCOPE_DA_SPEC, "Destination Address Specific"},
 306     { CLNP_OPTION_SCOPE_GLOBAL, "Globally unique"},
 307     { 0, NULL }
 308 };
 309
 310 static struct tok clnp_option_sr_rr_values[] = {
 311     { 0x0, "partial"},
 312     { 0x0, "complete"},
 313     { 0, NULL }
 314 };
 315
 316 static struct tok clnp_option_sr_rr_string_values[] = {
 317     { CLNP_OPTION_SOURCE_ROUTING, "source routing"},
 318     { CLNP_OPTION_ROUTE_RECORDING, "recording of route in progress"},
 319     { 0, NULL }
 320 };
 321
 322 static struct tok clnp_option_qos_global_values[] = {
 323     { 0x20, "reserved"},
 324     { 0x10, "sequencing vs. delay"},
 325     { 0x08, "congested"},
 326     { 0x04, "delay vs. cost"},
 327     { 0x02, "error vs. delay"},
 328     { 0x01, "error vs. cost"},
 329     { 0, NULL }
 330 };
 331
 332 #define ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP           3 /* draft-ietf-isis-traffic-05 */
 333 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID  4 /* draft-ietf-isis-gmpls-extensions */
 334 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID        5 /* draft-ietf-isis-traffic-05 */
 335 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR        6 /* draft-ietf-isis-traffic-05 */
 336 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR    8 /* draft-ietf-isis-traffic-05 */
 337 #define ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW           9 /* draft-ietf-isis-traffic-05 */
 338 #define ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW        10 /* draft-ietf-isis-traffic-05 */
 339 #define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW        11 /* draft-ietf-isis-traffic-05 */
 340 #define ISIS_SUBTLV_EXT_IS_REACH_DIFFSERV_TE          12 /* draft-ietf-tewg-diff-te-proto-06 */
 341 #define ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC            18 /* draft-ietf-isis-traffic-05 */
 342 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* draft-ietf-isis-gmpls-extensions */
 343 #define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR    21 /* draft-ietf-isis-gmpls-extensions */
 344
 345 static struct tok isis_ext_is_reach_subtlv_values[] = {
 346     { ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP,            "Administrative groups" },
 347     { ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID,   "Link Local/Remote Identifier" },
 348     { ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID,         "Link Remote Identifier" },
 349     { ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR,         "IPv4 interface address" },
 350     { ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR,     "IPv4 neighbor address" },
 351     { ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW,            "Maximum link bandwidth" },
 352     { ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW,          "Reservable link bandwidth" },
 353     { ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW,          "Unreserved bandwidth" },
 354     { ISIS_SUBTLV_EXT_IS_REACH_DIFFSERV_TE,            "Diffserv TE" },
 355     { ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC,              "Traffic Engineering Metric" },
 356     { ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE,   "Link Protection Type" },
 357     { ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR,      "Interface Switching Capability" },
 358     { 250,                                             "Reserved for cisco specific extensions" },
 359     { 251,                                             "Reserved for cisco specific extensions" },
 360     { 252,                                             "Reserved for cisco specific extensions" },
 361     { 253,                                             "Reserved for cisco specific extensions" },
 362     { 254,                                             "Reserved for cisco specific extensions" },
 363     { 255,                                             "Reserved for future expansion" },
 364     { 0, NULL }
 365 };
 366
 367 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32          1 /* draft-ietf-isis-admin-tags-01 */
 368 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64          2 /* draft-ietf-isis-admin-tags-01 */
 369 #define ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR  117 /* draft-ietf-isis-wg-multi-topology-05 */
 370
 371 static struct tok isis_ext_ip_reach_subtlv_values[] = {
 372     { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32,           "32-Bit Administrative tag" },
 373     { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64,           "64-Bit Administrative tag" },
 374     { ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR,     "Management Prefix Color" },
 375     { 0, NULL }
 376 };
 377
 378 #define ISIS_SUBTLV_AUTH_SIMPLE        1
 379 #define ISIS_SUBTLV_AUTH_MD5          54
 380 #define ISIS_SUBTLV_AUTH_MD5_LEN      16
 381 #define ISIS_SUBTLV_AUTH_PRIVATE     255
 382
 383 static struct tok isis_subtlv_auth_values[] = {
 384     { ISIS_SUBTLV_AUTH_SIMPLE,  "simple text password"},
 385     { ISIS_SUBTLV_AUTH_MD5,     "HMAC-MD5 password"},
 386     { ISIS_SUBTLV_AUTH_PRIVATE, "Routing Domain private password"},
 387     { 0, NULL }
 388 };
 389
 390 #define ISIS_SUBTLV_IDRP_RES           0
 391 #define ISIS_SUBTLV_IDRP_LOCAL         1
 392 #define ISIS_SUBTLV_IDRP_ASN           2
 393
 394 static struct tok isis_subtlv_idrp_values[] = {
 395     { ISIS_SUBTLV_IDRP_RES,         "Reserved"},
 396     { ISIS_SUBTLV_IDRP_LOCAL,       "Routing-Domain Specific"},
 397     { ISIS_SUBTLV_IDRP_ASN,         "AS Number Tag"},
 398     { 0, NULL}
 399 };
 400
 401 #define CLNP_SEGMENT_PART  0x80
 402 #define CLNP_MORE_SEGMENTS 0x40
 403 #define CLNP_REQUEST_ER    0x20
 404
 405 static struct tok clnp_flag_values[] = {
 406     { CLNP_SEGMENT_PART, "Segmentation permitted"},
 407     { CLNP_MORE_SEGMENTS, "more Segments"},
 408     { CLNP_REQUEST_ER, "request Error Report"},
 409     { 0, NULL}
 410 };
 411
 412 #define ISIS_MASK_LSP_OL_BIT(x)            ((x)&0x4)
 413 #define ISIS_MASK_LSP_ISTYPE_BITS(x)       ((x)&0x3)
 414 #define ISIS_MASK_LSP_PARTITION_BIT(x)     ((x)&0x80)
 415 #define ISIS_MASK_LSP_ATT_BITS(x)          ((x)&0x78)
 416 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x)     ((x)&0x40)
 417 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x)   ((x)&0x20)
 418 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x)     ((x)&0x10)
 419 #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x)   ((x)&0x8)
 420
 421 #define ISIS_MASK_MTID(x)                  ((x)&0x0fff)
 422 #define ISIS_MASK_MTFLAGS(x)               ((x)&0xf000)
 423
 424 static struct tok isis_mt_flag_values[] = {
 425     { 0x4000,                  "sub-TLVs present"},
 426     { 0x8000,                  "ATT bit set"},
 427     { 0, NULL}
 428 };
 429
 430 #define ISIS_MASK_TLV_EXTD_IP_UPDOWN(x)     ((x)&0x80)
 431 #define ISIS_MASK_TLV_EXTD_IP_SUBTLV(x)     ((x)&0x40)
 432
 433 #define ISIS_MASK_TLV_EXTD_IP6_IE(x)        ((x)&0x40)
 434 #define ISIS_MASK_TLV_EXTD_IP6_SUBTLV(x)    ((x)&0x20)
 435
 436 #define ISIS_LSP_TLV_METRIC_SUPPORTED(x)   ((x)&0x80)
 437 #define ISIS_LSP_TLV_METRIC_IE(x)          ((x)&0x40)
 438 #define ISIS_LSP_TLV_METRIC_UPDOWN(x)      ((x)&0x80)
 439 #define ISIS_LSP_TLV_METRIC_VALUE(x)       ((x)&0x3f)
 440
 441 #define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1)
 442
 443 static struct tok isis_mt_values[] = {
 444     { 0,    "IPv4 unicast"},
 445     { 1,    "In-Band Management"},
 446     { 2,    "IPv6 unicast"},
 447     { 3,    "Multicast"},
 448     { 4095, "Development, Experimental or Proprietary"},
 449     { 0, NULL }
 450 };
 451
 452 static struct tok isis_iih_circuit_type_values[] = {
 453     { 1,    "Level 1 only"},
 454     { 2,    "Level 2 only"},
 455     { 3,    "Level 1, Level 2"},
 456     { 0, NULL}
 457 };
 458
 459 #define ISIS_LSP_TYPE_UNUSED0   0
 460 #define ISIS_LSP_TYPE_LEVEL_1   1
 461 #define ISIS_LSP_TYPE_UNUSED2   2
 462 #define ISIS_LSP_TYPE_LEVEL_2   3
 463
 464 static struct tok isis_lsp_istype_values[] = {
 465     { ISIS_LSP_TYPE_UNUSED0,    "Unused 0x0 (invalid)"},
 466     { ISIS_LSP_TYPE_LEVEL_1,    "L1 IS"},
 467     { ISIS_LSP_TYPE_UNUSED2,    "Unused 0x2 (invalid)"},
 468     { ISIS_LSP_TYPE_LEVEL_2,    "L1L2 IS"},
 469     { 0, NULL }
 470 };
 471
 472 /*
 473  * Katz's point to point adjacency TLV uses codes to tell us the state of
 474  * the remote adjacency.  Enumerate them.
 475  */
 476
 477 #define ISIS_PTP_ADJ_UP   0
 478 #define ISIS_PTP_ADJ_INIT 1
 479 #define ISIS_PTP_ADJ_DOWN 2
 480
 481 static struct tok isis_ptp_adjancey_values[] = {
 482     { ISIS_PTP_ADJ_UP,    "Up" },
 483     { ISIS_PTP_ADJ_INIT,  "Initializing" },
 484     { ISIS_PTP_ADJ_DOWN,  "Down" },
 485     { 0, NULL}
 486 };
 487
 488 struct isis_tlv_ptp_adj {
 489     u_int8_t adjacency_state;
 490     u_int8_t extd_local_circuit_id[4];
 491     u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
 492     u_int8_t neighbor_extd_local_circuit_id[4];
 493 };
 494
 495 static int osi_cksum(const u_int8_t *, u_int);
 496 static int clnp_print(const u_int8_t *, u_int);
 497 static void esis_print(const u_int8_t *, u_int);
 498 static int isis_print(const u_int8_t *, u_int);
 499
 500 struct isis_metric_block {
 501     u_int8_t metric_default;
 502     u_int8_t metric_delay;
 503     u_int8_t metric_expense;
 504     u_int8_t metric_error;
 505 };
 506
 507 struct isis_tlv_is_reach {
 508     struct isis_metric_block isis_metric_block;
 509     u_int8_t neighbor_nodeid[NODE_ID_LEN];
 510 };
 511
 512 struct isis_tlv_es_reach {
 513     struct isis_metric_block isis_metric_block;
 514     u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
 515 };
 516
 517 struct isis_tlv_ip_reach {
 518     struct isis_metric_block isis_metric_block;
 519     u_int8_t prefix[4];
 520     u_int8_t mask[4];
 521 };
 522
 523 static struct tok isis_is_reach_virtual_values[] = {
 524     { 0,    "IsNotVirtual"},
 525     { 1,    "IsVirtual"},
 526     { 0, NULL }
 527 };
 528
 529 static struct tok isis_restart_flag_values[] = {
 530     { 0x1,  "Restart Request"},
 531     { 0x2,  "Restart Acknowledgement"},
 532     { 0, NULL }
 533 };
 534
 535 struct isis_common_header {
 536     u_int8_t nlpid;
 537     u_int8_t fixed_len;
 538     u_int8_t version;                   /* Protocol version */
 539     u_int8_t id_length;
 540     u_int8_t pdu_type;                  /* 3 MSbits are reserved */
 541     u_int8_t pdu_version;               /* Packet format version */
 542     u_int8_t reserved;
 543     u_int8_t max_area;
 544 };
 545
 546 struct isis_iih_lan_header {
 547     u_int8_t circuit_type;
 548     u_int8_t source_id[SYSTEM_ID_LEN];
 549     u_int8_t holding_time[2];
 550     u_int8_t pdu_len[2];
 551     u_int8_t priority;
 552     u_int8_t lan_id[NODE_ID_LEN];
 553 };
 554
 555 struct isis_iih_ptp_header {
 556     u_int8_t circuit_type;
 557     u_int8_t source_id[SYSTEM_ID_LEN];
 558     u_int8_t holding_time[2];
 559     u_int8_t pdu_len[2];
 560     u_int8_t circuit_id;
 561 };
 562
 563 struct isis_lsp_header {
 564     u_int8_t pdu_len[2];
 565     u_int8_t remaining_lifetime[2];
 566     u_int8_t lsp_id[LSP_ID_LEN];
 567     u_int8_t sequence_number[4];
 568     u_int8_t checksum[2];
 569     u_int8_t typeblock;
 570 };
 571
 572 struct isis_csnp_header {
 573     u_int8_t pdu_len[2];
 574     u_int8_t source_id[NODE_ID_LEN];
 575     u_int8_t start_lsp_id[LSP_ID_LEN];
 576     u_int8_t end_lsp_id[LSP_ID_LEN];
 577 };
 578
 579 struct isis_psnp_header {
 580     u_int8_t pdu_len[2];
 581     u_int8_t source_id[NODE_ID_LEN];
 582 };
 583
 584 struct isis_tlv_lsp {
 585     u_int8_t remaining_lifetime[2];
 586     u_int8_t lsp_id[LSP_ID_LEN];
 587     u_int8_t sequence_number[4];
 588     u_int8_t checksum[2];
 589 };
 590
 591 #define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
 592 #define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header))
 593 #define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header))
 594 #define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header))
 595 #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header))
 596 #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header))
 597
 598 void isoclns_print(const u_int8_t *p, u_int length, u_int caplen)
 599 {
 600         const struct isis_common_header *header;
 601
 602         header = (const struct isis_common_header *)p;
 603
 604         if (caplen <= 1) { /* enough bytes on the wire ? */
 605             printf("|OSI");
 606             return;
 607         }
 608
 609         if (eflag)
 610             printf("OSI NLPID %s (0x%02x): ",
 611                    tok2str(nlpid_values,"Unknown",*p),
 612                    *p);
 613
 614         switch (*p) {
 615
 616         case NLPID_CLNP:
 617                 if (!clnp_print(p, length))
 618                         print_unknown_data(p,"\n\t",caplen);
 619                 break;
 620
 621         case NLPID_ESIS:
 622                 esis_print(p, length);
 623                 return;
 624
 625         case NLPID_ISIS:
 626                 if (!isis_print(p, length))
 627                         print_unknown_data(p,"\n\t",caplen);
 628                 break;
 629
 630         case NLPID_NULLNS:
 631                 (void)printf("%slength: %u",
 632                              eflag ? "" : ", ",
 633                              length);
 634                 break;
 635
 636         case NLPID_Q933:
 637                 q933_print(p+1, length-1);
 638                 break;
 639
 640         case NLPID_IP:
 641                 ip_print(gndo, p+1, length-1);
 642                 break;
 643
 644 #ifdef INET6
 645         case NLPID_IP6:
 646                 ip6_print(p+1, length-1);
 647                 break;
 648 #endif
 649
 650         case NLPID_PPP:
 651                 ppp_print(p+1, length-1);
 652                 break;
 653
 654         default:
 655                 if (!eflag)
 656                     printf("OSI NLPID 0x%02x unknown",*p);
 657                 (void)printf("%slength: %u",
 658                              eflag ? "" : ", ",
 659                              length);
 660                 if (caplen > 1)
 661                         print_unknown_data(p,"\n\t",caplen);
 662                 break;
 663         }
 664 }
 665
 666 #define CLNP_PDU_ER      1
 667 #define CLNP_PDU_DT     28
 668 #define CLNP_PDU_MD     29
 669 #define CLNP_PDU_ERQ    30
 670 #define CLNP_PDU_ERP    31
 671
 672 static struct tok clnp_pdu_values[] = {
 673     { CLNP_PDU_ER,  "Error Report"},
 674     { CLNP_PDU_MD,  "MD"},
 675     { CLNP_PDU_DT,  "Data"},
 676     { CLNP_PDU_ERQ, "Echo Request"},
 677     { CLNP_PDU_ERP, "Echo Response"},
 678     { 0, NULL }
 679 };
 680
 681 struct clnp_header_t {
 682     u_int8_t nlpid;
 683     u_int8_t length_indicator;
 684     u_int8_t version;
 685     u_int8_t lifetime; /* units of 500ms */
 686     u_int8_t type;
 687     u_int8_t segment_length[2];
 688     u_int8_t cksum[2];
 689 };
 690
 691 struct clnp_segment_header_t {
 692     u_int8_t data_unit_id[2];
 693     u_int8_t segment_offset[2];
 694     u_int8_t total_length[2];
 695 };
 696
 697 /*
 698  * clnp_print
 699  * Decode CLNP packets.  Return 0 on error.
 700  */
 701
 702 static int clnp_print (const u_int8_t *pptr, u_int length)
 703 {
 704         const u_int8_t *optr,*source_address,*dest_address;
 705         u_int li,tlen,nsap_offset,source_address_length,dest_address_length, clnp_pdu_type, clnp_flags;
 706         const struct clnp_header_t *clnp_header;
 707         const struct clnp_segment_header_t *clnp_segment_header;
 708         u_int8_t rfd_error_major,rfd_error_minor;
 709
 710         clnp_header = (const struct clnp_header_t *) pptr;
 711         TCHECK(*clnp_header);
 712
 713         li = clnp_header->length_indicator;
 714         optr = pptr;
 715
 716         if (!eflag)
 717             printf("CLNP");
 718
 719         /*
 720          * Sanity checking of the header.
 721          */
 722
 723         if (clnp_header->version != CLNP_VERSION) {
 724             printf("version %d packet not supported", clnp_header->version);
 725             return (0);
 726         }
 727
 728         /* FIXME further header sanity checking */
 729
 730         clnp_pdu_type = clnp_header->type & CLNP_PDU_TYPE_MASK;
 731         clnp_flags = clnp_header->type & CLNP_FLAG_MASK;
 732
 733         pptr += sizeof(struct clnp_header_t);
 734         li -= sizeof(struct clnp_header_t);
 735         dest_address_length = *pptr;
 736         dest_address = pptr + 1;
 737
 738         pptr += (1 + dest_address_length);
 739         li -= (1 + dest_address_length);
 740         source_address_length = *pptr;
 741         source_address = pptr +1;
 742
 743         pptr += (1 + source_address_length);
 744         li -= (1 + source_address_length);
 745
 746         if (vflag < 1) {
 747             printf("%s%s > %s, %s, length %u",
 748                    eflag ? "" : ", ",
 749                    isonsap_string(source_address, source_address_length),
 750                    isonsap_string(dest_address, dest_address_length),
 751                    tok2str(clnp_pdu_values,"unknown (%u)",clnp_pdu_type),
 752                    length);
 753             return (1);
 754         }
 755         printf("%slength %u",eflag ? "" : ", ",length);
 756
 757         printf("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x ",
 758                tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type),
 759                clnp_header->length_indicator,
 760                clnp_header->version,
 761                clnp_header->lifetime/2,
 762                (clnp_header->lifetime%2)*5,
 763                EXTRACT_16BITS(clnp_header->segment_length),
 764                EXTRACT_16BITS(clnp_header->cksum));
 765
 766         /* do not attempt to verify the checksum if it is zero */
 767         if (EXTRACT_16BITS(clnp_header->cksum) == 0)
 768                 printf("(unverified)");
 769             else printf("(%s)", osi_cksum(optr, clnp_header->length_indicator) ? "incorrect" : "correct");
 770
 771         printf("\n\tFlags [%s]",
 772                bittok2str(clnp_flag_values,"none",clnp_flags));
 773
 774         printf("\n\tsource address (length %u): %s\n\tdest   address (length %u): %s",
 775                source_address_length,
 776                isonsap_string(source_address, source_address_length),
 777                dest_address_length,
 778                isonsap_string(dest_address,dest_address_length));
 779
 780         if (clnp_flags & CLNP_SEGMENT_PART) {
 781                 clnp_segment_header = (const struct clnp_segment_header_t *) pptr;
 782                 printf("\n\tData Unit ID: 0x%04x, Segment Offset: %u, Total PDU Length: %u",
 783                        EXTRACT_16BITS(clnp_segment_header->data_unit_id),
 784                        EXTRACT_16BITS(clnp_segment_header->segment_offset),
 785                        EXTRACT_16BITS(clnp_segment_header->total_length));
 786                 pptr+=sizeof(const struct clnp_segment_header_t);
 787                 li-=sizeof(const struct clnp_segment_header_t);
 788         }
 789
 790         /* now walk the options */
 791         while (li >= 2) {
 792             u_int op, opli;
 793             const u_int8_t *tptr;
 794
 795             TCHECK2(*pptr, 2);
 796             if (li < 2) {
 797                 printf(", bad opts/li");
 798                 return (0);
 799             }
 800             op = *pptr++;
 801             opli = *pptr++;
 802             li -= 2;
 803             TCHECK2(*pptr, opli);
 804             if (opli > li) {
 805                 printf(", opt (%d) too long", op);
 806                 return (0);
 807             }
 808             li -= opli;
 809             tptr = pptr;
 810             tlen = opli;
 811
 812             printf("\n\t  %s Option #%u, length %u, value: ",
 813                    tok2str(clnp_option_values,"Unknown",op),
 814                    op,
 815                    opli);
 816
 817             switch (op) {
 818
 819
 820             case CLNP_OPTION_ROUTE_RECORDING: /* those two options share the format */
 821             case CLNP_OPTION_SOURCE_ROUTING:
 822                     printf("%s %s",
 823                            tok2str(clnp_option_sr_rr_values,"Unknown",*tptr),
 824                            tok2str(clnp_option_sr_rr_string_values,"Unknown Option %u",op));
 825                     nsap_offset=*(tptr+1);
 826                     if (nsap_offset == 0) {
 827                             printf(" Bad NSAP offset (0)");
 828                             break;
 829                     }
 830                     nsap_offset-=1; /* offset to nsap list */
 831                     if (nsap_offset > tlen) {
 832                             printf(" Bad NSAP offset (past end of option)");
 833                             break;
 834                     }
 835                     tptr+=nsap_offset;
 836                     tlen-=nsap_offset;
 837                     while (tlen > 0) {
 838                             source_address_length=*tptr;
 839                             if (tlen < source_address_length+1) {
 840                                     printf("\n\t    NSAP address goes past end of option");
 841                                     break;
 842                             }
 843                             if (source_address_length > 0) {
 844                                     source_address=(tptr+1);
 845                                     TCHECK2(*source_address, source_address_length);
 846                                     printf("\n\t    NSAP address (length %u): %s",
 847                                            source_address_length,
 848                                            isonsap_string(source_address, source_address_length));
 849                             }
 850                             tlen-=source_address_length+1;
 851                     }
 852                     break;
 853
 854             case CLNP_OPTION_PRIORITY:
 855                     printf("0x%1x", *tptr&0x0f);
 856                     break;
 857
 858             case CLNP_OPTION_QOS_MAINTENANCE:
 859                     printf("\n\t    Format Code: %s",
 860                            tok2str(clnp_option_scope_values,"Reserved",*tptr&CLNP_OPTION_SCOPE_MASK));
 861
 862                     if ((*tptr&CLNP_OPTION_SCOPE_MASK) == CLNP_OPTION_SCOPE_GLOBAL)
 863                             printf("\n\t    QoS Flags [%s]",
 864                                    bittok2str(clnp_option_qos_global_values,
 865                                               "none",
 866                                               *tptr&CLNP_OPTION_OPTION_QOS_MASK));
 867                     break;
 868
 869             case CLNP_OPTION_SECURITY:
 870                     printf("\n\t    Format Code: %s, Security-Level %u",
 871                            tok2str(clnp_option_scope_values,"Reserved",*tptr&CLNP_OPTION_SCOPE_MASK),
 872                            *(tptr+1));
 873                     break;
 874
 875             case CLNP_OPTION_DISCARD_REASON:
 876                 rfd_error_major = (*tptr&0xf0) >> 4;
 877                 rfd_error_minor = *tptr&0x0f;
 878                 printf("\n\t    Class: %s Error (0x%01x), %s (0x%01x)",
 879                        tok2str(clnp_option_rfd_class_values,"Unknown",rfd_error_major),
 880                        rfd_error_major,
 881                        tok2str(clnp_option_rfd_error_class[rfd_error_major],"Unknown",rfd_error_minor),
 882                        rfd_error_minor);
 883                 break;
 884
 885             case CLNP_OPTION_PADDING:
 886                     printf("padding data");
 887                 break;
 888
 889                 /*
 890                  * FIXME those are the defined Options that lack a decoder
 891                  * you are welcome to contribute code ;-)
 892                  */
 893
 894             default:
 895                 print_unknown_data(tptr,"\n\t  ",opli);
 896                 break;
 897             }
 898             if (vflag > 1)
 899                 print_unknown_data(pptr,"\n\t  ",opli);
 900             pptr += opli;
 901         }
 902
 903         switch (clnp_pdu_type) {
 904
 905         case    CLNP_PDU_ER: /* fall through */
 906         case    CLNP_PDU_ERP:
 907             TCHECK(*pptr);
 908             if (*(pptr) == NLPID_CLNP) {
 909                 printf("\n\t-----original packet-----\n\t");
 910                 /* FIXME recursion protection */
 911                 clnp_print(pptr, length-clnp_header->length_indicator);
 912                 break;
 913             }
 914
 915         case    CLNP_PDU_DT:
 916         case    CLNP_PDU_MD:
 917         case    CLNP_PDU_ERQ:
 918
 919         default:
 920             /* dump the PDU specific data */
 921             if (length-(pptr-optr) > 0) {
 922                 printf("\n\t  undecoded non-header data, length %u",length-clnp_header->length_indicator);
 923                 print_unknown_data(pptr,"\n\t  ",length-(pptr-optr));
 924             }
 925         }
 926
 927         return (1);
 928
 929  trunc:
 930     fputs("[|clnp]", stdout);
 931     return (1);
 932
 933 }
 934
 935
 936 #define ESIS_PDU_REDIRECT       6
 937 #define ESIS_PDU_ESH            2
 938 #define ESIS_PDU_ISH            4
 939
 940 static struct tok esis_pdu_values[] = {
 941     { ESIS_PDU_REDIRECT, "redirect"},
 942     { ESIS_PDU_ESH,      "ESH"},
 943     { ESIS_PDU_ISH,      "ISH"},
 944     { 0, NULL }
 945 };
 946
 947 struct esis_header_t {
 948         u_int8_t nlpid;
 949         u_int8_t length_indicator;
 950         u_int8_t version;
 951         u_int8_t reserved;
 952         u_int8_t type;
 953         u_int8_t holdtime[2];
 954         u_int8_t cksum[2];
 955 };
 956
 957 static void
 958 esis_print(const u_int8_t *pptr, u_int length)
 959 {
 960         const u_int8_t *optr;
 961         u_int li,esis_pdu_type,source_address_length, source_address_number;
 962         const struct esis_header_t *esis_header;
 963
 964         if (!eflag)
 965             printf("ES-IS");
 966
 967         if (length <= 2) {
 968                 if (qflag)
 969                         printf("bad pkt!");
 970                 else
 971                         printf("no header at all!");
 972                 return;
 973         }
 974
 975         esis_header = (const struct esis_header_t *) pptr;
 976         TCHECK(*esis_header);
 977         li = esis_header->length_indicator;
 978         optr = pptr;
 979
 980         /*
 981          * Sanity checking of the header.
 982          */
 983
 984         if (esis_header->nlpid != NLPID_ESIS) {
 985             printf(" nlpid 0x%02x packet not supported", esis_header->nlpid);
 986             return;
 987         }
 988
 989         if (esis_header->version != ESIS_VERSION) {
 990             printf(" version %d packet not supported", esis_header->version);
 991             return;
 992         }
 993
 994         if (li > length) {
 995             printf(" length indicator(%d) > PDU size (%d)!", li, length);
 996             return;
 997         }
 998
 999         if (li < sizeof(struct esis_header_t) + 2) {
1000             printf(" length indicator < min PDU size %d:", li);
1001             while (--length != 0)
1002                 printf("%02X", *pptr++);
1003             return;
1004         }
1005
1006         esis_pdu_type = esis_header->type & ESIS_PDU_TYPE_MASK;
1007
1008         if (vflag < 1) {
1009             printf("%s%s, length %u",
1010                    eflag ? "" : ", ",
1011                    tok2str(esis_pdu_values,"unknown type (%u)",esis_pdu_type),
1012                    length);
1013             return;
1014         } else
1015             printf("%slength %u\n\t%s (%u)",
1016                    eflag ? "" : ", ",
1017                    length,
1018                    tok2str(esis_pdu_values,"unknown type: %u", esis_pdu_type),
1019                    esis_pdu_type);
1020
1021         printf(", v: %u%s", esis_header->version, esis_header->version == ESIS_VERSION ? "" : "unsupported" );
1022         printf(", checksum: 0x%04x ", EXTRACT_16BITS(esis_header->cksum));
1023         /* do not attempt to verify the checksum if it is zero */
1024         if (EXTRACT_16BITS(esis_header->cksum) == 0)
1025                 printf("(unverified)");
1026         else
1027                 printf("(%s)", osi_cksum(pptr, li) ? "incorrect" : "correct");
1028
1029         printf(", holding time: %us, length indicator: %u",EXTRACT_16BITS(esis_header->holdtime),li);
1030
1031         if (vflag > 1)
1032             print_unknown_data(optr,"\n\t",sizeof(struct esis_header_t));
1033
1034         pptr += sizeof(struct esis_header_t);
1035         li -= sizeof(struct esis_header_t);
1036
1037         switch (esis_pdu_type) {
1038         case ESIS_PDU_REDIRECT: {
1039                 const u_int8_t *dst, *snpa, *neta;
1040                 u_int dstl, snpal, netal;
1041
1042                 TCHECK(*pptr);
1043                 if (li < 1) {
1044                         printf(", bad redirect/li");
1045                         return;
1046                 }
1047                 dstl = *pptr;
1048                 pptr++;
1049                 li--;
1050                 TCHECK2(*pptr, dstl);
1051                 if (li < dstl) {
1052                         printf(", bad redirect/li");
1053                         return;
1054                 }
1055                 dst = pptr;
1056                 pptr += dstl;
1057                 li -= dstl;
1058                 printf("\n\t  %s", isonsap_string(dst,dstl));
1059
1060                 TCHECK(*pptr);
1061                 if (li < 1) {
1062                         printf(", bad redirect/li");
1063                         return;
1064                 }
1065                 snpal = *pptr;
1066                 pptr++;
1067                 li--;
1068                 TCHECK2(*pptr, snpal);
1069                 if (li < snpal) {
1070                         printf(", bad redirect/li");
1071                         return;
1072                 }
1073                 snpa = pptr;
1074                 pptr += snpal;
1075                 li -= snpal;
1076                 TCHECK(*pptr);
1077                 if (li < 1) {
1078                         printf(", bad redirect/li");
1079                         return;
1080                 }
1081                 netal = *pptr;
1082                 pptr++;
1083                 TCHECK2(*pptr, netal);
1084                 if (li < netal) {
1085                         printf(", bad redirect/li");
1086                         return;
1087                 }
1088                 neta = pptr;
1089                 pptr += netal;
1090                 li -= netal;
1091
1092                 if (netal == 0)
1093                         printf("\n\t  %s", etheraddr_string(snpa));
1094                 else
1095                         printf("\n\t  %s", isonsap_string(neta,netal));
1096                 break;
1097         }
1098
1099         case ESIS_PDU_ESH:
1100             TCHECK(*pptr);
1101             if (li < 1) {
1102                 printf(", bad esh/li");
1103                 return;
1104             }
1105             source_address_number = *pptr;
1106             pptr++;
1107             li--;
1108
1109             printf("\n\t  Number of Source Addresses: %u", source_address_number);
1110
1111             while (source_address_number > 0) {
1112                 TCHECK(*pptr);
1113                 if (li < 1) {
1114                     printf(", bad esh/li");
1115                     return;
1116                 }
1117                 source_address_length = *pptr;
1118                 pptr++;
1119                 li--;
1120
1121                 TCHECK2(*pptr, source_address_length);
1122                 if (li < source_address_length) {
1123                     printf(", bad esh/li");
1124                     return;
1125                 }
1126                 printf("\n\t  NET (length: %u): %s",
1127                        source_address_length,
1128                        isonsap_string(pptr,source_address_length));
1129                 pptr += source_address_length;
1130                 li -= source_address_length;
1131                 source_address_number--;
1132             }
1133
1134             break;
1135
1136         case ESIS_PDU_ISH: {
1137             TCHECK(*pptr);
1138             if (li < 1) {
1139                 printf(", bad ish/li");
1140                 return;
1141             }
1142             source_address_length = *pptr;
1143             pptr++;
1144             li--;
1145             TCHECK2(*pptr, source_address_length);
1146             if (li < source_address_length) {
1147                 printf(", bad ish/li");
1148                 return;
1149             }
1150             printf("\n\t  NET (length: %u): %s", source_address_length, isonsap_string(pptr, source_address_length));
1151             pptr += source_address_length;
1152             li -= source_address_length;
1153             break;
1154         }
1155
1156         default:
1157             if (vflag <= 1) {
1158                     if (pptr < snapend)
1159                             print_unknown_data(pptr,"\n\t  ",snapend-pptr);
1160             }
1161             return;
1162         }
1163
1164         /* now walk the options */
1165         while (li >= 2) {
1166             u_int op, opli;
1167             const u_int8_t *tptr;
1168
1169             TCHECK2(*pptr, 2);
1170             if (li < 2) {
1171                 printf(", bad opts/li");
1172                 return;
1173             }
1174             op = *pptr++;
1175             opli = *pptr++;
1176             li -= 2;
1177             if (opli > li) {
1178                 printf(", opt (%d) too long", op);
1179                 return;
1180             }
1181             li -= opli;
1182             tptr = pptr;
1183
1184             printf("\n\t  %s Option #%u, length %u, value: ",
1185                    tok2str(esis_option_values,"Unknown",op),
1186                    op,
1187                    opli);
1188
1189             switch (op) {
1190
1191             case ESIS_OPTION_ES_CONF_TIME:
1192                 TCHECK2(*pptr, 2);
1193                 printf("%us", EXTRACT_16BITS(tptr));
1194                 break;
1195
1196             case ESIS_OPTION_PROTOCOLS:
1197                 while (opli>0) {
1198                     TCHECK(*pptr);
1199                     printf("%s (0x%02x)",
1200                            tok2str(nlpid_values,
1201                                    "unknown",
1202                                    *tptr),
1203                            *tptr);
1204                     if (opli>1) /* further NPLIDs ? - put comma */
1205                         printf(", ");
1206                     tptr++;
1207                     opli--;
1208                 }
1209                 break;
1210
1211                 /*
1212                  * FIXME those are the defined Options that lack a decoder
1213                  * you are welcome to contribute code ;-)
1214                  */
1215
1216             case ESIS_OPTION_QOS_MAINTENANCE:
1217             case ESIS_OPTION_SECURITY:
1218             case ESIS_OPTION_PRIORITY:
1219             case ESIS_OPTION_ADDRESS_MASK:
1220             case ESIS_OPTION_SNPA_MASK:
1221
1222             default:
1223                 print_unknown_data(tptr,"\n\t  ",opli);
1224                 break;
1225             }
1226             if (vflag > 1)
1227                 print_unknown_data(pptr,"\n\t  ",opli);
1228             pptr += opli;
1229         }
1230 trunc:
1231         return;
1232 }
1233
1234 /* shared routine for printing system, node and lsp-ids */
1235 static char *
1236 isis_print_id(const u_int8_t *cp, int id_len)
1237 {
1238     int i;
1239     static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")];
1240     char *pos = id;
1241
1242     for (i = 1; i <= SYSTEM_ID_LEN; i++) {
1243         snprintf(pos, sizeof(id) - (pos - id), "%02x", *cp++);
1244         pos += strlen(pos);
1245         if (i == 2 || i == 4)
1246             *pos++ = '.';
1247         }
1248     if (id_len >= NODE_ID_LEN) {
1249         snprintf(pos, sizeof(id) - (pos - id), ".%02x", *cp++);
1250         pos += strlen(pos);
1251     }
1252     if (id_len == LSP_ID_LEN)
1253         snprintf(pos, sizeof(id) - (pos - id), "-%02x", *cp);
1254     return (id);
1255 }
1256
1257 /* print the 4-byte metric block which is common found in the old-style TLVs */
1258 static int
1259 isis_print_metric_block (const struct isis_metric_block *isis_metric_block)
1260 {
1261     printf(", Default Metric: %d, %s",
1262            ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default),
1263            ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal");
1264     if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay))
1265         printf("\n\t\t  Delay Metric: %d, %s",
1266                ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay),
1267                ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal");
1268     if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense))
1269         printf("\n\t\t  Expense Metric: %d, %s",
1270                ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense),
1271                ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal");
1272     if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error))
1273         printf("\n\t\t  Error Metric: %d, %s",
1274                ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error),
1275                ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal");
1276
1277     return(1); /* everything is ok */
1278 }
1279
1280 static int
1281 isis_print_tlv_ip_reach (const u_int8_t *cp, const char *ident, int length)
1282 {
1283         int prefix_len;
1284         const struct isis_tlv_ip_reach *tlv_ip_reach;
1285
1286         tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp;
1287
1288         while (length > 0) {
1289                 if ((size_t)length < sizeof(*tlv_ip_reach)) {
1290                         printf("short IPv4 Reachability (%d vs %lu)",
1291                                length,
1292                                (unsigned long)sizeof(*tlv_ip_reach));
1293                         return (0);
1294                 }
1295
1296                 if (!TTEST(*tlv_ip_reach))
1297                     return (0);
1298
1299                 prefix_len = mask2plen(EXTRACT_32BITS(tlv_ip_reach->mask));
1300
1301                 if (prefix_len == -1)
1302                         printf("%sIPv4 prefix: %s mask %s",
1303                                ident,
1304                                ipaddr_string((tlv_ip_reach->prefix)),
1305                                ipaddr_string((tlv_ip_reach->mask)));
1306                 else
1307                         printf("%sIPv4 prefix: %15s/%u",
1308                                ident,
1309                                ipaddr_string((tlv_ip_reach->prefix)),
1310                                prefix_len);
1311
1312                 printf(", Distribution: %s, Metric: %u, %s",
1313                        ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up",
1314                        ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default),
1315                        ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal");
1316
1317                 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay))
1318                     printf("%s  Delay Metric: %u, %s",
1319                            ident,
1320                            ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay),
1321                            ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal");
1322
1323                 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense))
1324                     printf("%s  Expense Metric: %u, %s",
1325                            ident,
1326                            ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense),
1327                            ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal");
1328
1329                 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error))
1330                     printf("%s  Error Metric: %u, %s",
1331                            ident,
1332                            ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error),
1333                            ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal");
1334
1335                 length -= sizeof(struct isis_tlv_ip_reach);
1336                 tlv_ip_reach++;
1337         }
1338         return (1);
1339 }
1340
1341 /*
1342  * this is the common IP-REACH subTLV decoder it is called
1343  * from various EXTD-IP REACH TLVs (135,235,236,237)
1344  */
1345
1346 static int
1347 isis_print_ip_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) {
1348
1349         /* first lets see if we know the subTLVs name*/
1350         printf("%s%s subTLV #%u, length: %u",
1351                ident,
1352                tok2str(isis_ext_ip_reach_subtlv_values,
1353                        "unknown",
1354                        subt),
1355                subt,
1356                subl);
1357
1358         if (!TTEST2(*tptr,subl))
1359             goto trunctlv;
1360
1361     switch(subt) {
1362     case ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR: /* fall through */
1363     case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32:
1364         while (subl >= 4) {
1365             printf(", 0x%08x (=%u)",
1366                    EXTRACT_32BITS(tptr),
1367                    EXTRACT_32BITS(tptr));
1368             tptr+=4;
1369             subl-=4;
1370         }
1371         break;
1372     case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64:
1373         while (subl >= 8) {
1374             printf(", 0x%08x%08x",
1375                    EXTRACT_32BITS(tptr),
1376                    EXTRACT_32BITS(tptr+4));
1377             tptr+=8;
1378             subl-=8;
1379         }
1380         break;
1381     default:
1382         if(!print_unknown_data(tptr,"\n\t\t    ",
1383                                subl))
1384           return(0);
1385         break;
1386     }
1387     return(1);
1388
1389 trunctlv:
1390     printf("%spacket exceeded snapshot",ident);
1391     return(0);
1392 }
1393
1394 /*
1395  * this is the common IS-REACH subTLV decoder it is called
1396  * from isis_print_ext_is_reach()
1397  */
1398
1399 static int
1400 isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) {
1401
1402         int priority_level,bandwidth_constraint;
1403         union { /* int to float conversion buffer for several subTLVs */
1404             float f;
1405             u_int32_t i;
1406         } bw;
1407
1408         /* first lets see if we know the subTLVs name*/
1409         printf("%s%s subTLV #%u, length: %u",
1410                ident,
1411                tok2str(isis_ext_is_reach_subtlv_values,
1412                        "unknown",
1413                        subt),
1414                subt,
1415                subl);
1416
1417         if (!TTEST2(*tptr,subl))
1418             goto trunctlv;
1419
1420         switch(subt) {
1421         case ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP:
1422         case ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID:
1423         case ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
1424             if (subl >= 4) {
1425               printf(", 0x%08x", EXTRACT_32BITS(tptr));
1426               if (subl == 8) /* draft-ietf-isis-gmpls-extensions */
1427                 printf(", 0x%08x", EXTRACT_32BITS(tptr+4));
1428             }
1429             break;
1430         case ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
1431         case ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
1432             if (subl >= 4)
1433               printf(", %s", ipaddr_string(tptr));
1434             break;
1435         case ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
1436         case ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW:
1437             if (subl >= 4) {
1438               bw.i = EXTRACT_32BITS(tptr);
1439               printf(", %.3f Mbps", bw.f*8/1000000 );
1440             }
1441             break;
1442         case ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
1443             if (subl >= 32) {
1444               for (priority_level = 0; priority_level < 8; priority_level++) {
1445                 bw.i = EXTRACT_32BITS(tptr);
1446                 printf("%s  priority level %d: %.3f Mbps",
1447                        ident,
1448                        priority_level,
1449                        bw.f*8/1000000 );
1450                 tptr+=4;
1451               }
1452             }
1453             break;
1454         case ISIS_SUBTLV_EXT_IS_REACH_DIFFSERV_TE:
1455             printf("%sBandwidth Constraints Model ID: %s (%u)",
1456                    ident,
1457                    tok2str(diffserv_te_bc_values, "unknown", *tptr),
1458                    *tptr);
1459             tptr++;
1460             /* decode BCs until the subTLV ends */
1461             for (bandwidth_constraint = 0; bandwidth_constraint < (subl-1)/4; bandwidth_constraint++) {
1462                 bw.i = EXTRACT_32BITS(tptr);
1463                 printf("%s  Bandwidth constraint %d: %.3f Mbps",
1464                        ident,
1465                        bandwidth_constraint,
1466                        bw.f*8/1000000 );
1467                 tptr+=4;
1468             }
1469             break;
1470         case ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC:
1471             if (subl >= 3)
1472               printf(", %u", EXTRACT_24BITS(tptr));
1473             break;
1474         case ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
1475             if (subl >= 2) {
1476               printf(", %s, Priority %u",
1477                    bittok2str(gmpls_link_prot_values, "none", *tptr),
1478                    *(tptr+1));
1479             }
1480             break;
1481         case ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
1482             if (subl >= 36) {
1483               printf("%s  Interface Switching Capability:%s",
1484                    ident,
1485                    tok2str(gmpls_switch_cap_values, "Unknown", *(tptr)));
1486               printf(", LSP Encoding: %s",
1487                    tok2str(gmpls_encoding_values, "Unknown", *(tptr+1)));
1488               tptr+=4;
1489               printf("%s  Max LSP Bandwidth:",ident);
1490               for (priority_level = 0; priority_level < 8; priority_level++) {
1491                 bw.i = EXTRACT_32BITS(tptr);
1492                 printf("%s    priority level %d: %.3f Mbps",
1493                        ident,
1494                        priority_level,
1495                        bw.f*8/1000000 );
1496                 tptr+=4;
1497               }
1498               subl-=36;
1499               /* there is some optional stuff left to decode but this is as of yet
1500                  not specified so just lets hexdump what is left */
1501               if(subl>0){
1502                 if(!print_unknown_data(tptr,"\n\t\t    ",
1503                                        subl-36))
1504                     return(0);
1505               }
1506             }
1507             break;
1508         default:
1509             if(!print_unknown_data(tptr,"\n\t\t    ",
1510                                    subl))
1511                 return(0);
1512             break;
1513         }
1514         return(1);
1515
1516 trunctlv:
1517     printf("%spacket exceeded snapshot",ident);
1518     return(0);
1519 }
1520
1521
1522 /*
1523  * this is the common IS-REACH decoder it is called
1524  * from various EXTD-IS REACH style TLVs (22,24,222)
1525  */
1526
1527 static int
1528 isis_print_ext_is_reach (const u_int8_t *tptr,const char *ident, int tlv_type) {
1529
1530     char ident_buffer[20];
1531     int subtlv_type,subtlv_len,subtlv_sum_len;
1532     int proc_bytes = 0; /* how many bytes did we process ? */
1533
1534     if (!TTEST2(*tptr, NODE_ID_LEN))
1535         return(0);
1536
1537     printf("%sIS Neighbor: %s", ident, isis_print_id(tptr, NODE_ID_LEN));
1538     tptr+=(NODE_ID_LEN);
1539
1540     if (tlv_type != ISIS_TLV_IS_ALIAS_ID) { /* the Alias TLV Metric field is implicit 0 */
1541         if (!TTEST2(*tptr, 3))    /* and is therefore skipped */
1542             return(0);
1543         printf(", Metric: %d",EXTRACT_24BITS(tptr));
1544         tptr+=3;
1545     }
1546
1547     if (!TTEST2(*tptr, 1))
1548         return(0);
1549     subtlv_sum_len=*(tptr++); /* read out subTLV length */
1550     proc_bytes=NODE_ID_LEN+3+1;
1551     printf(", %ssub-TLVs present",subtlv_sum_len ? "" : "no ");
1552     if (subtlv_sum_len) {
1553         printf(" (%u)",subtlv_sum_len);
1554         while (subtlv_sum_len>0) {
1555             if (!TTEST2(*tptr,2))
1556                 return(0);
1557             subtlv_type=*(tptr++);
1558             subtlv_len=*(tptr++);
1559             /* prepend the ident string */
1560             snprintf(ident_buffer, sizeof(ident_buffer), "%s  ",ident);
1561             if(!isis_print_is_reach_subtlv(tptr,subtlv_type,subtlv_len,ident_buffer))
1562                 return(0);
1563             tptr+=subtlv_len;
1564             subtlv_sum_len-=(subtlv_len+2);
1565             proc_bytes+=(subtlv_len+2);
1566         }
1567     }
1568     return(proc_bytes);
1569 }
1570
1571 /*
1572  * this is the common Multi Topology ID decoder
1573  * it is called from various MT-TLVs (222,229,235,237)
1574  */
1575
1576 static int
1577 isis_print_mtid (const u_int8_t *tptr,const char *ident) {
1578
1579     if (!TTEST2(*tptr, 2))
1580         return(0);
1581
1582     printf("%s%s",
1583            ident,
1584            tok2str(isis_mt_values,
1585                    "Reserved for IETF Consensus",
1586                    ISIS_MASK_MTID(EXTRACT_16BITS(tptr))));
1587
1588     printf(" Topology (0x%03x), Flags: [%s]",
1589            ISIS_MASK_MTID(EXTRACT_16BITS(tptr)),
1590            bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(EXTRACT_16BITS(tptr))));
1591
1592     return(2);
1593 }
1594
1595 /*
1596  * this is the common extended IP reach decoder
1597  * it is called from TLVs (135,235,236,237)
1598  * we process the TLV and optional subTLVs and return
1599  * the amount of processed bytes
1600  */
1601
1602 static int
1603 isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi) {
1604
1605     char ident_buffer[20];
1606     u_int8_t prefix[16]; /* shared copy buffer for IPv4 and IPv6 prefixes */
1607     u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen;
1608
1609     if (!TTEST2(*tptr, 4))
1610         return (0);
1611     metric = EXTRACT_32BITS(tptr);
1612     processed=4;
1613     tptr+=4;
1614
1615     if (afi == IPV4) {
1616         if (!TTEST2(*tptr, 1)) /* fetch status byte */
1617             return (0);
1618         status_byte=*(tptr++);
1619         bit_length = status_byte&0x3f;
1620         processed++;
1621 #ifdef INET6
1622     } else if (afi == IPV6) {
1623         if (!TTEST2(*tptr, 1)) /* fetch status & prefix_len byte */
1624             return (0);
1625         status_byte=*(tptr++);
1626         bit_length=*(tptr++);
1627         processed+=2;
1628 #endif
1629     } else
1630         return (0); /* somebody is fooling us */
1631
1632     byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
1633
1634     if (!TTEST2(*tptr, byte_length))
1635         return (0);
1636     memset(prefix, 0, 16);              /* clear the copy buffer */
1637     memcpy(prefix,tptr,byte_length);    /* copy as much as is stored in the TLV */
1638     tptr+=byte_length;
1639     processed+=byte_length;
1640
1641     if (afi == IPV4)
1642         printf("%sIPv4 prefix: %15s/%u",
1643                ident,
1644                ipaddr_string(prefix),
1645                bit_length);
1646 #ifdef INET6
1647     if (afi == IPV6)
1648         printf("%sIPv6 prefix: %s/%u",
1649                ident,
1650                ip6addr_string(prefix),
1651                bit_length);
1652 #endif
1653
1654     printf(", Distribution: %s, Metric: %u",
1655            ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up",
1656            metric);
1657
1658     if (afi == IPV4 && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
1659         printf(", sub-TLVs present");
1660 #ifdef INET6
1661     if (afi == IPV6)
1662         printf(", %s%s",
1663                ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal",
1664                ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : "");
1665 #endif
1666
1667     if ((ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)  && afi == IPV4) ||
1668         (ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) && afi == IPV6)) {
1669         /* assume that one prefix can hold more
1670            than one subTLV - therefore the first byte must reflect
1671            the aggregate bytecount of the subTLVs for this prefix
1672         */
1673         if (!TTEST2(*tptr, 1))
1674             return (0);
1675         sublen=*(tptr++);
1676         processed+=sublen+1;
1677         printf(" (%u)",sublen);   /* print out subTLV length */
1678
1679         while (sublen>0) {
1680             if (!TTEST2(*tptr,2))
1681                 return (0);
1682             subtlvtype=*(tptr++);
1683             subtlvlen=*(tptr++);
1684             /* prepend the ident string */
1685             snprintf(ident_buffer, sizeof(ident_buffer), "%s  ",ident);
1686             if(!isis_print_ip_reach_subtlv(tptr,subtlvtype,subtlvlen,ident_buffer))
1687                 return(0);
1688             tptr+=subtlvlen;
1689             sublen-=(subtlvlen+2);
1690         }
1691     }
1692     return (processed);
1693 }
1694
1695 /*
1696  * isis_print
1697  * Decode IS-IS packets.  Return 0 on error.
1698  */
1699
1700 static int isis_print (const u_int8_t *p, u_int length)
1701 {
1702     const struct isis_common_header *isis_header;
1703
1704     const struct isis_iih_lan_header *header_iih_lan;
1705     const struct isis_iih_ptp_header *header_iih_ptp;
1706     const struct isis_lsp_header *header_lsp;
1707     const struct isis_csnp_header *header_csnp;
1708     const struct isis_psnp_header *header_psnp;
1709
1710     const struct isis_tlv_lsp *tlv_lsp;
1711     const struct isis_tlv_ptp_adj *tlv_ptp_adj;
1712     const struct isis_tlv_is_reach *tlv_is_reach;
1713     const struct isis_tlv_es_reach *tlv_es_reach;
1714
1715     u_int8_t pdu_type, max_area, id_length, tlv_type, tlv_len, tmp, alen, lan_alen, prefix_len;
1716     u_int8_t ext_is_len, ext_ip_len, mt_len;
1717     const u_int8_t *optr, *pptr, *tptr;
1718     u_short packet_len,pdu_len;
1719     u_int i,vendor_id;
1720
1721     packet_len=length;
1722     optr = p; /* initialize the _o_riginal pointer to the packet start -
1723                  need it for parsing the checksum TLV */
1724     isis_header = (const struct isis_common_header *)p;
1725     TCHECK(*isis_header);
1726     pptr = p+(ISIS_COMMON_HEADER_SIZE);
1727     header_iih_lan = (const struct isis_iih_lan_header *)pptr;
1728     header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
1729     header_lsp = (const struct isis_lsp_header *)pptr;
1730     header_csnp = (const struct isis_csnp_header *)pptr;
1731     header_psnp = (const struct isis_psnp_header *)pptr;
1732
1733     if (!eflag)
1734         printf("IS-IS");
1735
1736     /*
1737      * Sanity checking of the header.
1738      */
1739
1740     if (isis_header->version != ISIS_VERSION) {
1741         printf("version %d packet not supported", isis_header->version);
1742         return (0);
1743     }
1744
1745     if ((isis_header->id_length != SYSTEM_ID_LEN) && (isis_header->id_length != 0)) {
1746         printf("system ID length of %d is not supported",
1747                isis_header->id_length);
1748         return (0);
1749     }
1750
1751     if (isis_header->pdu_version != ISIS_VERSION) {
1752         printf("version %d packet not supported", isis_header->pdu_version);
1753         return (0);
1754     }
1755
1756     max_area = isis_header->max_area;
1757     switch(max_area) {
1758     case 0:
1759         max_area = 3;    /* silly shit */
1760         break;
1761     case 255:
1762         printf("bad packet -- 255 areas");
1763         return (0);
1764     default:
1765         break;
1766     }
1767
1768     id_length = isis_header->id_length;
1769     switch(id_length) {
1770     case 0:
1771         id_length = 6;   /* silly shit again */
1772         break;
1773     case 1:              /* 1-8 are valid sys-ID lenghts */
1774     case 2:
1775     case 3:
1776     case 4:
1777     case 5:
1778     case 6:
1779     case 7:
1780     case 8:
1781         break;
1782     case 255:
1783         id_length = 0;   /* entirely useless */
1784         break;
1785     default:
1786         break;
1787     }
1788
1789     /* toss any non 6-byte sys-ID len PDUs */
1790     if (id_length != 6 ) {
1791         printf("bad packet -- illegal sys-ID length (%u)", id_length);
1792         return (0);
1793     }
1794
1795     pdu_type=isis_header->pdu_type;
1796
1797     /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/
1798     if (vflag < 1) {
1799         printf("%s%s",
1800                eflag ? "" : ", ",
1801                tok2str(isis_pdu_values,"unknown PDU-Type %u",pdu_type));
1802
1803         switch (pdu_type) {
1804
1805         case ISIS_PDU_L1_LAN_IIH:
1806         case ISIS_PDU_L2_LAN_IIH:
1807             printf(", src-id %s",
1808                    isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN));
1809             printf(", lan-id %s, prio %u",
1810                    isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN),
1811                    header_iih_lan->priority);
1812             break;
1813         case ISIS_PDU_PTP_IIH:
1814             printf(", src-id %s", isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN));
1815             break;
1816         case ISIS_PDU_L1_LSP:
1817         case ISIS_PDU_L2_LSP:
1818             printf(", lsp-id %s, seq 0x%08x, lifetime %5us",
1819                    isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
1820                    EXTRACT_32BITS(header_lsp->sequence_number),
1821                    EXTRACT_16BITS(header_lsp->remaining_lifetime));
1822             break;
1823         case ISIS_PDU_L1_CSNP:
1824         case ISIS_PDU_L2_CSNP:
1825             printf(", src-id %s", isis_print_id(header_csnp->source_id,NODE_ID_LEN));
1826             break;
1827         case ISIS_PDU_L1_PSNP:
1828         case ISIS_PDU_L2_PSNP:
1829             printf(", src-id %s", isis_print_id(header_psnp->source_id,NODE_ID_LEN));
1830             break;
1831
1832         }
1833         printf(", length %u", length);
1834
1835         return(1);
1836     }
1837
1838     /* ok they seem to want to know everything - lets fully decode it */
1839     printf("%slength %u", eflag ? "" : ", ",length);
1840
1841     printf("\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)",
1842            tok2str(isis_pdu_values,
1843                    "unknown, type %u",
1844                    pdu_type),
1845            isis_header->fixed_len,
1846            isis_header->version,
1847            isis_header->pdu_version,
1848            id_length,
1849            isis_header->id_length,
1850            max_area,
1851            isis_header->max_area);
1852
1853     if (vflag > 1) {
1854         if(!print_unknown_data(optr,"\n\t",8)) /* provide the _o_riginal pointer */
1855             return(0);                         /* for optionally debugging the common header */
1856     }
1857
1858     switch (pdu_type) {
1859
1860     case ISIS_PDU_L1_LAN_IIH:
1861     case ISIS_PDU_L2_LAN_IIH:
1862         if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) {
1863             printf(", bogus fixed header length %u should be %lu",
1864                    isis_header->fixed_len, (unsigned long)ISIS_IIH_LAN_HEADER_SIZE);
1865             return (0);
1866         }
1867
1868         pdu_len=EXTRACT_16BITS(header_iih_lan->pdu_len);
1869         if (packet_len>pdu_len) {
1870             packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1871             length=pdu_len;
1872         }
1873
1874         TCHECK(*header_iih_lan);
1875         printf("\n\t  source-id: %s,  holding time: %us, Flags: [%s]",
1876                isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN),
1877                EXTRACT_16BITS(header_iih_lan->holding_time),
1878                tok2str(isis_iih_circuit_type_values,
1879                        "unknown circuit type 0x%02x",
1880                        header_iih_lan->circuit_type));
1881
1882         printf("\n\t  lan-id:    %s, Priority: %u, PDU length: %u",
1883                isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN),
1884                (header_iih_lan->priority) & ISIS_LAN_PRIORITY_MASK,
1885                pdu_len);
1886
1887         if (vflag > 1) {
1888             if(!print_unknown_data(pptr,"\n\t  ",ISIS_IIH_LAN_HEADER_SIZE))
1889                 return(0);
1890         }
1891
1892         packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
1893         pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
1894         break;
1895
1896     case ISIS_PDU_PTP_IIH:
1897         if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) {
1898             printf(", bogus fixed header length %u should be %lu",
1899                    isis_header->fixed_len, (unsigned long)ISIS_IIH_PTP_HEADER_SIZE);
1900             return (0);
1901         }
1902
1903         pdu_len=EXTRACT_16BITS(header_iih_ptp->pdu_len);
1904         if (packet_len>pdu_len) {
1905             packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1906             length=pdu_len;
1907         }
1908
1909         TCHECK(*header_iih_ptp);
1910         printf("\n\t  source-id: %s, holding time: %us, Flags: [%s]",
1911                isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN),
1912                EXTRACT_16BITS(header_iih_ptp->holding_time),
1913                tok2str(isis_iih_circuit_type_values,
1914                        "unknown circuit type 0x%02x",
1915                        header_iih_ptp->circuit_type));
1916
1917         printf("\n\t  circuit-id: 0x%02x, PDU length: %u",
1918                header_iih_ptp->circuit_id,
1919                pdu_len);
1920
1921         if (vflag > 1) {
1922             if(!print_unknown_data(pptr,"\n\t  ",ISIS_IIH_PTP_HEADER_SIZE))
1923                 return(0);
1924         }
1925
1926         packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
1927         pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
1928         break;
1929
1930     case ISIS_PDU_L1_LSP:
1931     case ISIS_PDU_L2_LSP:
1932         if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) {
1933             printf(", bogus fixed header length %u should be %lu",
1934                    isis_header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE);
1935             return (0);
1936         }
1937
1938         pdu_len=EXTRACT_16BITS(header_lsp->pdu_len);
1939         if (packet_len>pdu_len) {
1940             packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1941             length=pdu_len;
1942         }
1943
1944         TCHECK(*header_lsp);
1945         printf("\n\t  lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t  chksum: 0x%04x",
1946                isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
1947                EXTRACT_32BITS(header_lsp->sequence_number),
1948                EXTRACT_16BITS(header_lsp->remaining_lifetime),
1949                EXTRACT_16BITS(header_lsp->checksum));
1950
1951         /* if this is a purge do not attempt to verify the checksum */
1952         if ( EXTRACT_16BITS(header_lsp->remaining_lifetime) == 0 &&
1953              EXTRACT_16BITS(header_lsp->checksum) == 0)
1954             printf(" (purged)");
1955         else
1956             /* verify the checksum -
1957              * checking starts at the lsp-id field at byte position [12]
1958              * hence the length needs to be reduced by 12 bytes */
1959             printf(" (%s)", (osi_cksum((u_int8_t *)header_lsp->lsp_id, length-12)) ? "incorrect" : "correct");
1960
1961         printf(", PDU length: %u, Flags: [ %s",
1962                pdu_len,
1963                ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : "");
1964
1965         if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) {
1966             printf("%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : "");
1967             printf("%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : "");
1968             printf("%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : "");
1969             printf("%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : "");
1970             printf("ATT bit set, ");
1971         }
1972         printf("%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : "");
1973         printf("%s ]", tok2str(isis_lsp_istype_values,"Unknown(0x%x)",ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)));
1974
1975         if (vflag > 1) {
1976             if(!print_unknown_data(pptr,"\n\t  ",ISIS_LSP_HEADER_SIZE))
1977                 return(0);
1978         }
1979
1980         packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
1981         pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
1982         break;
1983
1984     case ISIS_PDU_L1_CSNP:
1985     case ISIS_PDU_L2_CSNP:
1986         if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) {
1987             printf(", bogus fixed header length %u should be %lu",
1988                    isis_header->fixed_len, (unsigned long)ISIS_CSNP_HEADER_SIZE);
1989             return (0);
1990         }
1991
1992         pdu_len=EXTRACT_16BITS(header_csnp->pdu_len);
1993         if (packet_len>pdu_len) {
1994             packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1995             length=pdu_len;
1996         }
1997
1998         TCHECK(*header_csnp);
1999         printf("\n\t  source-id:    %s, PDU length: %u",
2000                isis_print_id(header_csnp->source_id, NODE_ID_LEN),
2001                pdu_len);
2002         printf("\n\t  start lsp-id: %s",
2003                isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN));
2004         printf("\n\t  end lsp-id:   %s",
2005                isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN));
2006
2007         if (vflag > 1) {
2008             if(!print_unknown_data(pptr,"\n\t  ",ISIS_CSNP_HEADER_SIZE))
2009                 return(0);
2010         }
2011
2012         packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
2013         pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
2014         break;
2015
2016     case ISIS_PDU_L1_PSNP:
2017     case ISIS_PDU_L2_PSNP:
2018         if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) {
2019             printf("- bogus fixed header length %u should be %lu",
2020                    isis_header->fixed_len, (unsigned long)ISIS_PSNP_HEADER_SIZE);
2021             return (0);
2022         }
2023
2024         pdu_len=EXTRACT_16BITS(header_psnp->pdu_len);
2025         if (packet_len>pdu_len) {
2026             packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2027             length=pdu_len;
2028         }
2029
2030         TCHECK(*header_psnp);
2031         printf("\n\t  source-id:    %s, PDU length: %u",
2032                isis_print_id(header_psnp->source_id, NODE_ID_LEN),
2033                pdu_len);
2034
2035         if (vflag > 1) {
2036             if(!print_unknown_data(pptr,"\n\t  ",ISIS_PSNP_HEADER_SIZE))
2037                 return(0);
2038         }
2039
2040         packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
2041         pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
2042         break;
2043
2044     default:
2045         if(!print_unknown_data(pptr,"\n\t  ",length))
2046             return(0);
2047         return (0);
2048     }
2049
2050     /*
2051      * Now print the TLV's.
2052      */
2053
2054     while (packet_len >= 2) {
2055         if (pptr == snapend) {
2056             return (1);
2057         }
2058
2059         if (!TTEST2(*pptr, 2)) {
2060             printf("\n\t\t packet exceeded snapshot (%ld) bytes",
2061                    (long)(pptr-snapend));
2062             return (1);
2063         }
2064         tlv_type = *pptr++;
2065         tlv_len = *pptr++;
2066         tmp =tlv_len; /* copy temporary len & pointer to packet data */
2067         tptr = pptr;
2068         packet_len -= 2;
2069         if (tlv_len > packet_len) {
2070             break;
2071         }
2072
2073         /* first lets see if we know the TLVs name*/
2074         printf("\n\t    %s TLV #%u, length: %u",
2075                tok2str(isis_tlv_values,
2076                        "unknown",
2077                        tlv_type),
2078                tlv_type,
2079                tlv_len);
2080
2081         if (tlv_len == 0) /* something is malformed */
2082             break;
2083
2084         /* now check if we have a decoder otherwise do a hexdump at the end*/
2085         switch (tlv_type) {
2086         case ISIS_TLV_AREA_ADDR:
2087             if (!TTEST2(*tptr, 1))
2088                 goto trunctlv;
2089             alen = *tptr++;
2090             while (tmp && alen < tmp) {
2091                 printf("\n\t      Area address (length: %u): %s",
2092                        alen,
2093                        isonsap_string(tptr,alen));
2094                 tptr += alen;
2095                 tmp -= alen + 1;
2096                 if (tmp==0) /* if this is the last area address do not attemt a boundary check */
2097                     break;
2098                 if (!TTEST2(*tptr, 1))
2099                     goto trunctlv;
2100                 alen = *tptr++;
2101             }
2102             break;
2103         case ISIS_TLV_ISNEIGH:
2104             while (tmp >= ETHER_ADDR_LEN) {
2105                 if (!TTEST2(*tptr, ETHER_ADDR_LEN))
2106                     goto trunctlv;
2107                 printf("\n\t      SNPA: %s",isis_print_id(tptr,ETHER_ADDR_LEN));
2108                 tmp -= ETHER_ADDR_LEN;
2109                 tptr += ETHER_ADDR_LEN;
2110             }
2111             break;
2112
2113         case ISIS_TLV_ISNEIGH_VARLEN:
2114             if (!TTEST2(*tptr, 1) || tmp < 3) /* min. TLV length */
2115                 goto trunctlv;
2116             lan_alen = *tptr++; /* LAN address length */
2117             if (lan_alen == 0) {
2118                 printf("\n\t      LAN address length 0 bytes (invalid)");
2119                 break;
2120             }
2121             tmp --;
2122             printf("\n\t      LAN address length %u bytes ",lan_alen);
2123             while (tmp >= lan_alen) {
2124                 if (!TTEST2(*tptr, lan_alen))
2125                     goto trunctlv;
2126                 printf("\n\t\tIS Neighbor: %s",isis_print_id(tptr,lan_alen));
2127                 tmp -= lan_alen;
2128                 tptr +=lan_alen;
2129             }
2130             break;
2131
2132         case ISIS_TLV_PADDING:
2133             break;
2134
2135         case ISIS_TLV_MT_IS_REACH:
2136             while (tmp >= 2+NODE_ID_LEN+3+1) {
2137                 mt_len = isis_print_mtid(tptr, "\n\t      ");
2138                 if (mt_len == 0) /* did something go wrong ? */
2139                     goto trunctlv;
2140                 tptr+=mt_len;
2141                 tmp-=mt_len;
2142
2143                 ext_is_len = isis_print_ext_is_reach(tptr,"\n\t      ",tlv_type);
2144                 if (ext_is_len == 0) /* did something go wrong ? */
2145                     goto trunctlv;
2146
2147                 tmp-=ext_is_len;
2148                 tptr+=ext_is_len;
2149             }
2150             break;
2151
2152         case ISIS_TLV_IS_ALIAS_ID:
2153             while (tmp >= NODE_ID_LEN+1) { /* is it worth attempting a decode ? */
2154                 ext_is_len = isis_print_ext_is_reach(tptr,"\n\t      ",tlv_type);
2155                 if (ext_is_len == 0) /* did something go wrong ? */
2156                     goto trunctlv;
2157                 tmp-=ext_is_len;
2158                 tptr+=ext_is_len;
2159             }
2160             break;
2161
2162         case ISIS_TLV_EXT_IS_REACH:
2163             while (tmp >= NODE_ID_LEN+3+1) { /* is it worth attempting a decode ? */
2164                 ext_is_len = isis_print_ext_is_reach(tptr,"\n\t      ",tlv_type);
2165                 if (ext_is_len == 0) /* did something go wrong ? */
2166                     goto trunctlv;
2167                 tmp-=ext_is_len;
2168                 tptr+=ext_is_len;
2169             }
2170             break;
2171         case ISIS_TLV_IS_REACH:
2172             if (!TTEST2(*tptr,1))  /* check if there is one byte left to read out the virtual flag */
2173                 goto trunctlv;
2174             printf("\n\t      %s",
2175                    tok2str(isis_is_reach_virtual_values,
2176                            "bogus virtual flag 0x%02x",
2177                            *tptr++));
2178             tlv_is_reach = (const struct isis_tlv_is_reach *)tptr;
2179             while (tmp >= sizeof(struct isis_tlv_is_reach)) {
2180                 if (!TTEST(*tlv_is_reach))
2181                     goto trunctlv;
2182                 printf("\n\t      IS Neighbor: %s",
2183                        isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN));
2184                 isis_print_metric_block(&tlv_is_reach->isis_metric_block);
2185                 tmp -= sizeof(struct isis_tlv_is_reach);
2186                 tlv_is_reach++;
2187             }
2188             break;
2189
2190         case ISIS_TLV_ESNEIGH:
2191             tlv_es_reach = (const struct isis_tlv_es_reach *)tptr;
2192             while (tmp >= sizeof(struct isis_tlv_es_reach)) {
2193                 if (!TTEST(*tlv_es_reach))
2194                     goto trunctlv;
2195                 printf("\n\t      ES Neighbor: %s",
2196                        isis_print_id(tlv_es_reach->neighbor_sysid,SYSTEM_ID_LEN));
2197                 isis_print_metric_block(&tlv_es_reach->isis_metric_block);
2198                 tmp -= sizeof(struct isis_tlv_es_reach);
2199                 tlv_es_reach++;
2200             }
2201             break;
2202
2203             /* those two TLVs share the same format */
2204         case ISIS_TLV_INT_IP_REACH:
2205         case ISIS_TLV_EXT_IP_REACH:
2206             if (!isis_print_tlv_ip_reach(pptr, "\n\t      ", tlv_len))
2207                 return (1);
2208             break;
2209
2210         case ISIS_TLV_EXTD_IP_REACH:
2211             while (tmp>0) {
2212                 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV4);
2213                 if (ext_ip_len == 0) /* did something go wrong ? */
2214                     goto trunctlv;
2215                 tptr+=ext_ip_len;
2216                 tmp-=ext_ip_len;
2217             }
2218             break;
2219
2220         case ISIS_TLV_MT_IP_REACH:
2221             while (tmp>0) {
2222                 mt_len = isis_print_mtid(tptr, "\n\t      ");
2223                 if (mt_len == 0) /* did something go wrong ? */
2224                     goto trunctlv;
2225                 tptr+=mt_len;
2226                 tmp-=mt_len;
2227
2228                 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV4);
2229                 if (ext_ip_len == 0) /* did something go wrong ? */
2230                     goto trunctlv;
2231                 tptr+=ext_ip_len;
2232                 tmp-=ext_ip_len;
2233             }
2234             break;
2235
2236 #ifdef INET6
2237         case ISIS_TLV_IP6_REACH:
2238             while (tmp>0) {
2239                 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV6);
2240                 if (ext_ip_len == 0) /* did something go wrong ? */
2241                     goto trunctlv;
2242                 tptr+=ext_ip_len;
2243                 tmp-=ext_ip_len;
2244             }
2245             break;
2246
2247         case ISIS_TLV_MT_IP6_REACH:
2248             while (tmp>0) {
2249                 mt_len = isis_print_mtid(tptr, "\n\t      ");
2250                 if (mt_len == 0) /* did something go wrong ? */
2251                     goto trunctlv;
2252                 tptr+=mt_len;
2253                 tmp-=mt_len;
2254
2255                 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV6);
2256                 if (ext_ip_len == 0) /* did something go wrong ? */
2257                     goto trunctlv;
2258                 tptr+=ext_ip_len;
2259                 tmp-=ext_ip_len;
2260             }
2261             break;
2262
2263         case ISIS_TLV_IP6ADDR:
2264             while (tmp>0) {
2265                 if (!TTEST2(*tptr, 16))
2266                     goto trunctlv;
2267
2268                 printf("\n\t      IPv6 interface address: %s",
2269                        ip6addr_string(tptr));
2270
2271                 tptr += 16;
2272                 tmp -= 16;
2273             }
2274             break;
2275 #endif
2276         case ISIS_TLV_AUTH:
2277             if (!TTEST2(*tptr, 1))
2278                 goto trunctlv;
2279
2280             printf("\n\t      %s: ",
2281                    tok2str(isis_subtlv_auth_values,
2282                            "unknown Authentication type 0x%02x",
2283                            *tptr));
2284
2285             switch (*tptr) {
2286             case ISIS_SUBTLV_AUTH_SIMPLE:
2287                 for(i=1;i<tlv_len;i++) {
2288                     if (!TTEST2(*(tptr+i), 1))
2289                         goto trunctlv;
2290                     printf("%c",*(tptr+i));
2291                 }
2292                 break;
2293             case ISIS_SUBTLV_AUTH_MD5:
2294                 for(i=1;i<tlv_len;i++) {
2295                     if (!TTEST2(*(tptr+i), 1))
2296                         goto trunctlv;
2297                     printf("%02x",*(tptr+i));
2298                 }
2299                 if (tlv_len != ISIS_SUBTLV_AUTH_MD5_LEN+1)
2300                     printf(", (malformed subTLV) ");
2301                 break;
2302             case ISIS_SUBTLV_AUTH_PRIVATE:
2303             default:
2304                 if(!print_unknown_data(tptr+1,"\n\t\t  ",tlv_len-1))
2305                     return(0);
2306                 break;
2307             }
2308             break;
2309
2310         case ISIS_TLV_PTP_ADJ:
2311             tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr;
2312             if(tmp>=1) {
2313                 if (!TTEST2(*tptr, 1))
2314                     goto trunctlv;
2315                 printf("\n\t      Adjacency State: %s (%u)",
2316                        tok2str(isis_ptp_adjancey_values, "unknown", *tptr),
2317                         *tptr);
2318                 tmp--;
2319             }
2320             if(tmp>sizeof(tlv_ptp_adj->extd_local_circuit_id)) {
2321                 if (!TTEST2(tlv_ptp_adj->extd_local_circuit_id,
2322                             sizeof(tlv_ptp_adj->extd_local_circuit_id)))
2323                     goto trunctlv;
2324                 printf("\n\t      Extended Local circuit-ID: 0x%08x",
2325                        EXTRACT_32BITS(tlv_ptp_adj->extd_local_circuit_id));
2326                 tmp-=sizeof(tlv_ptp_adj->extd_local_circuit_id);
2327             }
2328             if(tmp>=SYSTEM_ID_LEN) {
2329                 if (!TTEST2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN))
2330                     goto trunctlv;
2331                 printf("\n\t      Neighbor System-ID: %s",
2332                        isis_print_id(tlv_ptp_adj->neighbor_sysid,SYSTEM_ID_LEN));
2333                 tmp-=SYSTEM_ID_LEN;
2334             }
2335             if(tmp>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) {
2336                 if (!TTEST2(tlv_ptp_adj->neighbor_extd_local_circuit_id,
2337                             sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)))
2338                     goto trunctlv;
2339                 printf("\n\t      Neighbor Extended Local circuit-ID: 0x%08x",
2340                        EXTRACT_32BITS(tlv_ptp_adj->neighbor_extd_local_circuit_id));
2341             }
2342             break;
2343
2344         case ISIS_TLV_PROTOCOLS:
2345             printf("\n\t      NLPID(s): ");
2346             while (tmp>0) {
2347                 if (!TTEST2(*(tptr), 1))
2348                     goto trunctlv;
2349                 printf("%s (0x%02x)",
2350                        tok2str(nlpid_values,
2351                                "unknown",
2352                                *tptr),
2353                        *tptr);
2354                 if (tmp>1) /* further NPLIDs ? - put comma */
2355                     printf(", ");
2356                 tptr++;
2357                 tmp--;
2358             }
2359             break;
2360
2361         case ISIS_TLV_TE_ROUTER_ID:
2362             if (!TTEST2(*pptr, 4))
2363                 goto trunctlv;
2364             printf("\n\t      Traffic Engineering Router ID: %s", ipaddr_string(pptr));
2365             break;
2366
2367         case ISIS_TLV_IPADDR:
2368             while (tmp>0) {
2369                 if (!TTEST2(*tptr, 4))
2370                     goto trunctlv;
2371                 printf("\n\t      IPv4 interface address: %s", ipaddr_string(tptr));
2372                 tptr += 4;
2373                 tmp -= 4;
2374             }
2375             break;
2376
2377         case ISIS_TLV_HOSTNAME:
2378             printf("\n\t      Hostname: ");
2379             while (tmp>0) {
2380                 if (!TTEST2(*tptr, 1))
2381                     goto trunctlv;
2382                 printf("%c",*tptr++);
2383                 tmp--;
2384             }
2385             break;
2386
2387         case ISIS_TLV_SHARED_RISK_GROUP:
2388             if (!TTEST2(*tptr, NODE_ID_LEN))
2389                 goto trunctlv;
2390             printf("\n\t      IS Neighbor: %s", isis_print_id(tptr, NODE_ID_LEN));
2391             tptr+=(NODE_ID_LEN);
2392             tmp-=(NODE_ID_LEN);
2393
2394             if (!TTEST2(*tptr, 1))
2395                 goto trunctlv;
2396             printf(", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered");
2397             tmp--;
2398
2399             if (!TTEST2(*tptr,4))
2400                 goto trunctlv;
2401             printf("\n\t      IPv4 interface address: %s", ipaddr_string(tptr));
2402             tptr+=4;
2403             tmp-=4;
2404
2405             if (!TTEST2(*tptr,4))
2406                 goto trunctlv;
2407             printf("\n\t      IPv4 neighbor address: %s", ipaddr_string(tptr));
2408             tptr+=4;
2409             tmp-=4;
2410
2411             while (tmp>0) {
2412                 if (!TTEST2(*tptr, 4))
2413                     goto trunctlv;
2414                 printf("\n\t      Link-ID: 0x%08x", EXTRACT_32BITS(tptr));
2415                 tptr+=4;
2416                 tmp-=4;
2417             }
2418             break;
2419
2420         case ISIS_TLV_LSP:
2421             tlv_lsp = (const struct isis_tlv_lsp *)tptr;
2422             while(tmp>0) {
2423                 if (!TTEST((tlv_lsp->lsp_id)[LSP_ID_LEN-1]))
2424                     goto trunctlv;
2425                 printf("\n\t      lsp-id: %s",
2426                        isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN));
2427                 if (!TTEST2(tlv_lsp->sequence_number, 4))
2428                     goto trunctlv;
2429                 printf(", seq: 0x%08x",EXTRACT_32BITS(tlv_lsp->sequence_number));
2430                 if (!TTEST2(tlv_lsp->remaining_lifetime, 2))
2431                     goto trunctlv;
2432                 printf(", lifetime: %5ds",EXTRACT_16BITS(tlv_lsp->remaining_lifetime));
2433                 if (!TTEST2(tlv_lsp->checksum, 2))
2434                     goto trunctlv;
2435                 printf(", chksum: 0x%04x",EXTRACT_16BITS(tlv_lsp->checksum));
2436                 tmp-=sizeof(struct isis_tlv_lsp);
2437                 tlv_lsp++;
2438             }
2439             break;
2440
2441         case ISIS_TLV_CHECKSUM:
2442             if (!TTEST2(*tptr, 2))
2443                 goto trunctlv;
2444             printf("\n\t      checksum: 0x%04x ", EXTRACT_16BITS(tptr));
2445             /* do not attempt to verify the checksum if it is zero
2446              * most likely a HMAC-MD5 TLV is also present and
2447              * to avoid conflicts the checksum TLV is zeroed.
2448              * see rfc3358 for details
2449              */
2450             if (EXTRACT_16BITS(tptr) == 0)
2451                 printf("(unverified)");
2452             else printf("(%s)", osi_cksum(optr, length) ? "incorrect" : "correct");
2453             break;
2454
2455         case ISIS_TLV_MT_SUPPORTED:
2456             while (tmp>1) {
2457                 /* length can only be a multiple of 2, otherwise there is
2458                    something broken -> so decode down until length is 1 */
2459                 if (tmp!=1) {
2460                     mt_len = isis_print_mtid(tptr, "\n\t      ");
2461                     if (mt_len == 0) /* did something go wrong ? */
2462                         goto trunctlv;
2463                     tptr+=mt_len;
2464                     tmp-=mt_len;
2465                 } else {
2466                     printf("\n\t      malformed MT-ID");
2467                     break;
2468                 }
2469             }
2470             break;
2471
2472         case ISIS_TLV_RESTART_SIGNALING:
2473             if (!TTEST2(*tptr, 3))
2474                 goto trunctlv;
2475             printf("\n\t      Flags [%s], Remaining holding time %us",
2476                    bittok2str(isis_restart_flag_values, "none", *tptr),
2477                    EXTRACT_16BITS(tptr+1));
2478             tptr+=3;
2479             break;
2480
2481         case ISIS_TLV_IDRP_INFO:
2482             if (!TTEST2(*tptr, 1))
2483                 goto trunctlv;
2484             printf("\n\t      Inter-Domain Information Type: %s",
2485                    tok2str(isis_subtlv_idrp_values,
2486                            "Unknown (0x%02x)",
2487                            *tptr));
2488             switch (*tptr++) {
2489             case ISIS_SUBTLV_IDRP_ASN:
2490                 if (!TTEST2(*tptr, 2)) /* fetch AS number */
2491                     goto trunctlv;
2492                 printf("AS Number: %u",EXTRACT_16BITS(tptr));
2493                 break;
2494             case ISIS_SUBTLV_IDRP_LOCAL:
2495             case ISIS_SUBTLV_IDRP_RES:
2496             default:
2497                 if(!print_unknown_data(tptr,"\n\t      ",tlv_len-1))
2498                     return(0);
2499                 break;
2500             }
2501             break;
2502
2503         case ISIS_TLV_LSP_BUFFERSIZE:
2504             if (!TTEST2(*tptr, 2))
2505                 goto trunctlv;
2506             printf("\n\t      LSP Buffersize: %u",EXTRACT_16BITS(tptr));
2507             break;
2508
2509         case ISIS_TLV_PART_DIS:
2510             while (tmp >= SYSTEM_ID_LEN) {
2511                 if (!TTEST2(*tptr, SYSTEM_ID_LEN))
2512                     goto trunctlv;
2513                 printf("\n\t      %s",isis_print_id(tptr,SYSTEM_ID_LEN));
2514                 tptr+=SYSTEM_ID_LEN;
2515                 tmp-=SYSTEM_ID_LEN;
2516             }
2517             break;
2518
2519         case ISIS_TLV_PREFIX_NEIGH:
2520             if (!TTEST2(*tptr, sizeof(struct isis_metric_block)))
2521                 goto trunctlv;
2522             printf("\n\t      Metric Block");
2523             isis_print_metric_block((const struct isis_metric_block *)tptr);
2524             tptr+=sizeof(struct isis_metric_block);
2525             tmp-=sizeof(struct isis_metric_block);
2526
2527             while(tmp>0) {
2528                 if (!TTEST2(*tptr, 1))
2529                     goto trunctlv;
2530                 prefix_len=*tptr++; /* read out prefix length in semioctets*/
2531                 if (prefix_len < 2) {
2532                     printf("\n\t\tAddress: prefix length %u < 2", prefix_len);
2533                     break;
2534                 }
2535                 tmp--;
2536                 if (!TTEST2(*tptr, prefix_len/2))
2537                     goto trunctlv;
2538                 printf("\n\t\tAddress: %s/%u",
2539                        isonsap_string(tptr,prefix_len/2),
2540                        prefix_len*4);
2541                 tptr+=prefix_len/2;
2542                 tmp-=prefix_len/2;
2543             }
2544             break;
2545
2546         case ISIS_TLV_IIH_SEQNR:
2547             if (!TTEST2(*tptr, 4)) /* check if four bytes are on the wire */
2548                 goto trunctlv;
2549             printf("\n\t      Sequence number: %u", EXTRACT_32BITS(tptr) );
2550             break;
2551
2552         case ISIS_TLV_VENDOR_PRIVATE:
2553             if (!TTEST2(*tptr, 3)) /* check if enough byte for a full oui */
2554                 goto trunctlv;
2555             vendor_id = EXTRACT_24BITS(tptr);
2556             printf("\n\t      Vendor: %s (%u)",
2557                    tok2str(oui_values,"Unknown",vendor_id),
2558                    vendor_id);
2559             tptr+=3;
2560             tmp-=3;
2561             if (tmp > 0) /* hexdump the rest */
2562                 if(!print_unknown_data(tptr,"\n\t\t",tmp))
2563                     return(0);
2564             break;
2565             /*
2566              * FIXME those are the defined TLVs that lack a decoder
2567              * you are welcome to contribute code ;-)
2568              */
2569
2570         case ISIS_TLV_DECNET_PHASE4:
2571         case ISIS_TLV_LUCENT_PRIVATE:
2572         case ISIS_TLV_IPAUTH:
2573         case ISIS_TLV_NORTEL_PRIVATE1:
2574         case ISIS_TLV_NORTEL_PRIVATE2:
2575
2576         default:
2577             if (vflag <= 1) {
2578                 if(!print_unknown_data(pptr,"\n\t\t",tlv_len))
2579                     return(0);
2580             }
2581             break;
2582         }
2583         /* do we want to see an additionally hexdump ? */
2584         if (vflag> 1) {
2585             if(!print_unknown_data(pptr,"\n\t      ",tlv_len))
2586                 return(0);
2587         }
2588
2589         pptr += tlv_len;
2590         packet_len -= tlv_len;
2591     }
2592
2593     if (packet_len != 0) {
2594         printf("\n\t      %u straggler bytes", packet_len);
2595     }
2596     return (1);
2597
2598  trunc:
2599     fputs("[|isis]", stdout);
2600     return (1);
2601
2602  trunctlv:
2603     printf("\n\t\t packet exceeded snapshot");
2604     return(1);
2605 }
2606
2607 /*
2608  * Verify the checksum.  See 8473-1, Appendix C, section C.4.
2609  */
2610
2611 static int
2612 osi_cksum(const u_int8_t *tptr, u_int len)
2613 {
2614         int32_t c0 = 0, c1 = 0;
2615
2616         while ((int)--len >= 0) {
2617                 c0 += *tptr++;
2618                 c0 %= 255;
2619                 c1 += c0;
2620                 c1 %= 255;
2621         }
2622         return (c0 | c1);
2623 }
2624
2625
2626 /*
2627  * Local Variables:
2628  * c-style: whitesmith
2629  * c-basic-offset: 8
2630  * End:
2631  */