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@gredler.at) for more 24 * complete IS-IS & CLNP support. 25 */ 26 27 #include <sys/cdefs.h> 28 #ifndef lint 29 __RCSID("$NetBSD: print-isoclns.c,v 1.9 2017/09/08 14:01:13 christos Exp $"); 30 #endif 31 32 /* \summary: ISO CLNS, ESIS, and ISIS printer */ 33 34 #ifdef HAVE_CONFIG_H 35 #include "config.h" 36 #endif 37 38 #include <netdissect-stdinc.h> 39 40 #include <string.h> 41 42 #include "netdissect.h" 43 #include "addrtoname.h" 44 #include "ether.h" 45 #include "nlpid.h" 46 #include "extract.h" 47 #include "gmpls.h" 48 #include "oui.h" 49 #include "signature.h" 50 51 static const char tstr[] = " [|isis]"; 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 const 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_CHECKSUM_MINLEN 2 114 #define ISIS_TLV_POI 13 /* rfc6232 */ 115 #define ISIS_TLV_LSP_BUFFERSIZE 14 /* iso10589 rev2 */ 116 #define ISIS_TLV_LSP_BUFFERSIZE_MINLEN 2 117 #define ISIS_TLV_EXT_IS_REACH 22 /* draft-ietf-isis-traffic-05 */ 118 #define ISIS_TLV_IS_ALIAS_ID 24 /* draft-ietf-isis-ext-lsp-frags-02 */ 119 #define ISIS_TLV_DECNET_PHASE4 42 120 #define ISIS_TLV_LUCENT_PRIVATE 66 121 #define ISIS_TLV_INT_IP_REACH 128 /* rfc1195, rfc2966 */ 122 #define ISIS_TLV_PROTOCOLS 129 /* rfc1195 */ 123 #define ISIS_TLV_EXT_IP_REACH 130 /* rfc1195, rfc2966 */ 124 #define ISIS_TLV_IDRP_INFO 131 /* rfc1195 */ 125 #define ISIS_TLV_IDRP_INFO_MINLEN 1 126 #define ISIS_TLV_IPADDR 132 /* rfc1195 */ 127 #define ISIS_TLV_IPAUTH 133 /* rfc1195 */ 128 #define ISIS_TLV_TE_ROUTER_ID 134 /* draft-ietf-isis-traffic-05 */ 129 #define ISIS_TLV_EXTD_IP_REACH 135 /* draft-ietf-isis-traffic-05 */ 130 #define ISIS_TLV_HOSTNAME 137 /* rfc2763 */ 131 #define ISIS_TLV_SHARED_RISK_GROUP 138 /* draft-ietf-isis-gmpls-extensions */ 132 #define ISIS_TLV_MT_PORT_CAP 143 /* rfc6165 */ 133 #define ISIS_TLV_MT_CAPABILITY 144 /* rfc6329 */ 134 #define ISIS_TLV_NORTEL_PRIVATE1 176 135 #define ISIS_TLV_NORTEL_PRIVATE2 177 136 #define ISIS_TLV_RESTART_SIGNALING 211 /* rfc3847 */ 137 #define ISIS_TLV_RESTART_SIGNALING_FLAGLEN 1 138 #define ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN 2 139 #define ISIS_TLV_MT_IS_REACH 222 /* draft-ietf-isis-wg-multi-topology-05 */ 140 #define ISIS_TLV_MT_SUPPORTED 229 /* draft-ietf-isis-wg-multi-topology-05 */ 141 #define ISIS_TLV_MT_SUPPORTED_MINLEN 2 142 #define ISIS_TLV_IP6ADDR 232 /* draft-ietf-isis-ipv6-02 */ 143 #define ISIS_TLV_MT_IP_REACH 235 /* draft-ietf-isis-wg-multi-topology-05 */ 144 #define ISIS_TLV_IP6_REACH 236 /* draft-ietf-isis-ipv6-02 */ 145 #define ISIS_TLV_MT_IP6_REACH 237 /* draft-ietf-isis-wg-multi-topology-05 */ 146 #define ISIS_TLV_PTP_ADJ 240 /* rfc3373 */ 147 #define ISIS_TLV_IIH_SEQNR 241 /* draft-shen-isis-iih-sequence-00 */ 148 #define ISIS_TLV_IIH_SEQNR_MINLEN 4 149 #define ISIS_TLV_VENDOR_PRIVATE 250 /* draft-ietf-isis-experimental-tlv-01 */ 150 #define ISIS_TLV_VENDOR_PRIVATE_MINLEN 3 151 152 static const struct tok isis_tlv_values[] = { 153 { ISIS_TLV_AREA_ADDR, "Area address(es)"}, 154 { ISIS_TLV_IS_REACH, "IS Reachability"}, 155 { ISIS_TLV_ESNEIGH, "ES Neighbor(s)"}, 156 { ISIS_TLV_PART_DIS, "Partition DIS"}, 157 { ISIS_TLV_PREFIX_NEIGH, "Prefix Neighbors"}, 158 { ISIS_TLV_ISNEIGH, "IS Neighbor(s)"}, 159 { ISIS_TLV_ISNEIGH_VARLEN, "IS Neighbor(s) (variable length)"}, 160 { ISIS_TLV_PADDING, "Padding"}, 161 { ISIS_TLV_LSP, "LSP entries"}, 162 { ISIS_TLV_AUTH, "Authentication"}, 163 { ISIS_TLV_CHECKSUM, "Checksum"}, 164 { ISIS_TLV_POI, "Purge Originator Identifier"}, 165 { ISIS_TLV_LSP_BUFFERSIZE, "LSP Buffersize"}, 166 { ISIS_TLV_EXT_IS_REACH, "Extended IS Reachability"}, 167 { ISIS_TLV_IS_ALIAS_ID, "IS Alias ID"}, 168 { ISIS_TLV_DECNET_PHASE4, "DECnet Phase IV"}, 169 { ISIS_TLV_LUCENT_PRIVATE, "Lucent Proprietary"}, 170 { ISIS_TLV_INT_IP_REACH, "IPv4 Internal Reachability"}, 171 { ISIS_TLV_PROTOCOLS, "Protocols supported"}, 172 { ISIS_TLV_EXT_IP_REACH, "IPv4 External Reachability"}, 173 { ISIS_TLV_IDRP_INFO, "Inter-Domain Information Type"}, 174 { ISIS_TLV_IPADDR, "IPv4 Interface address(es)"}, 175 { ISIS_TLV_IPAUTH, "IPv4 authentication (deprecated)"}, 176 { ISIS_TLV_TE_ROUTER_ID, "Traffic Engineering Router ID"}, 177 { ISIS_TLV_EXTD_IP_REACH, "Extended IPv4 Reachability"}, 178 { ISIS_TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"}, 179 { ISIS_TLV_MT_PORT_CAP, "Multi-Topology-Aware Port Capability"}, 180 { ISIS_TLV_MT_CAPABILITY, "Multi-Topology Capability"}, 181 { ISIS_TLV_NORTEL_PRIVATE1, "Nortel Proprietary"}, 182 { ISIS_TLV_NORTEL_PRIVATE2, "Nortel Proprietary"}, 183 { ISIS_TLV_HOSTNAME, "Hostname"}, 184 { ISIS_TLV_RESTART_SIGNALING, "Restart Signaling"}, 185 { ISIS_TLV_MT_IS_REACH, "Multi Topology IS Reachability"}, 186 { ISIS_TLV_MT_SUPPORTED, "Multi Topology"}, 187 { ISIS_TLV_IP6ADDR, "IPv6 Interface address(es)"}, 188 { ISIS_TLV_MT_IP_REACH, "Multi-Topology IPv4 Reachability"}, 189 { ISIS_TLV_IP6_REACH, "IPv6 reachability"}, 190 { ISIS_TLV_MT_IP6_REACH, "Multi-Topology IP6 Reachability"}, 191 { ISIS_TLV_PTP_ADJ, "Point-to-point Adjacency State"}, 192 { ISIS_TLV_IIH_SEQNR, "Hello PDU Sequence Number"}, 193 { ISIS_TLV_VENDOR_PRIVATE, "Vendor Private"}, 194 { 0, NULL } 195 }; 196 197 #define ESIS_OPTION_PROTOCOLS 129 198 #define ESIS_OPTION_QOS_MAINTENANCE 195 /* iso9542 */ 199 #define ESIS_OPTION_SECURITY 197 /* iso9542 */ 200 #define ESIS_OPTION_ES_CONF_TIME 198 /* iso9542 */ 201 #define ESIS_OPTION_PRIORITY 205 /* iso9542 */ 202 #define ESIS_OPTION_ADDRESS_MASK 225 /* iso9542 */ 203 #define ESIS_OPTION_SNPA_MASK 226 /* iso9542 */ 204 205 static const struct tok esis_option_values[] = { 206 { ESIS_OPTION_PROTOCOLS, "Protocols supported"}, 207 { ESIS_OPTION_QOS_MAINTENANCE, "QoS Maintenance" }, 208 { ESIS_OPTION_SECURITY, "Security" }, 209 { ESIS_OPTION_ES_CONF_TIME, "ES Configuration Time" }, 210 { ESIS_OPTION_PRIORITY, "Priority" }, 211 { ESIS_OPTION_ADDRESS_MASK, "Addressk Mask" }, 212 { ESIS_OPTION_SNPA_MASK, "SNPA Mask" }, 213 { 0, NULL } 214 }; 215 216 #define CLNP_OPTION_DISCARD_REASON 193 217 #define CLNP_OPTION_QOS_MAINTENANCE 195 /* iso8473 */ 218 #define CLNP_OPTION_SECURITY 197 /* iso8473 */ 219 #define CLNP_OPTION_SOURCE_ROUTING 200 /* iso8473 */ 220 #define CLNP_OPTION_ROUTE_RECORDING 203 /* iso8473 */ 221 #define CLNP_OPTION_PADDING 204 /* iso8473 */ 222 #define CLNP_OPTION_PRIORITY 205 /* iso8473 */ 223 224 static const struct tok clnp_option_values[] = { 225 { CLNP_OPTION_DISCARD_REASON, "Discard Reason"}, 226 { CLNP_OPTION_PRIORITY, "Priority"}, 227 { CLNP_OPTION_QOS_MAINTENANCE, "QoS Maintenance"}, 228 { CLNP_OPTION_SECURITY, "Security"}, 229 { CLNP_OPTION_SOURCE_ROUTING, "Source Routing"}, 230 { CLNP_OPTION_ROUTE_RECORDING, "Route Recording"}, 231 { CLNP_OPTION_PADDING, "Padding"}, 232 { 0, NULL } 233 }; 234 235 static const struct tok clnp_option_rfd_class_values[] = { 236 { 0x0, "General"}, 237 { 0x8, "Address"}, 238 { 0x9, "Source Routeing"}, 239 { 0xa, "Lifetime"}, 240 { 0xb, "PDU Discarded"}, 241 { 0xc, "Reassembly"}, 242 { 0, NULL } 243 }; 244 245 static const struct tok clnp_option_rfd_general_values[] = { 246 { 0x0, "Reason not specified"}, 247 { 0x1, "Protocol procedure error"}, 248 { 0x2, "Incorrect checksum"}, 249 { 0x3, "PDU discarded due to congestion"}, 250 { 0x4, "Header syntax error (cannot be parsed)"}, 251 { 0x5, "Segmentation needed but not permitted"}, 252 { 0x6, "Incomplete PDU received"}, 253 { 0x7, "Duplicate option"}, 254 { 0, NULL } 255 }; 256 257 static const struct tok clnp_option_rfd_address_values[] = { 258 { 0x0, "Destination address unreachable"}, 259 { 0x1, "Destination address unknown"}, 260 { 0, NULL } 261 }; 262 263 static const struct tok clnp_option_rfd_source_routeing_values[] = { 264 { 0x0, "Unspecified source routeing error"}, 265 { 0x1, "Syntax error in source routeing field"}, 266 { 0x2, "Unknown address in source routeing field"}, 267 { 0x3, "Path not acceptable"}, 268 { 0, NULL } 269 }; 270 271 static const struct tok clnp_option_rfd_lifetime_values[] = { 272 { 0x0, "Lifetime expired while data unit in transit"}, 273 { 0x1, "Lifetime expired during reassembly"}, 274 { 0, NULL } 275 }; 276 277 static const struct tok clnp_option_rfd_pdu_discard_values[] = { 278 { 0x0, "Unsupported option not specified"}, 279 { 0x1, "Unsupported protocol version"}, 280 { 0x2, "Unsupported security option"}, 281 { 0x3, "Unsupported source routeing option"}, 282 { 0x4, "Unsupported recording of route option"}, 283 { 0, NULL } 284 }; 285 286 static const struct tok clnp_option_rfd_reassembly_values[] = { 287 { 0x0, "Reassembly interference"}, 288 { 0, NULL } 289 }; 290 291 /* array of 16 error-classes */ 292 static const struct tok *clnp_option_rfd_error_class[] = { 293 clnp_option_rfd_general_values, 294 NULL, 295 NULL, 296 NULL, 297 NULL, 298 NULL, 299 NULL, 300 NULL, 301 clnp_option_rfd_address_values, 302 clnp_option_rfd_source_routeing_values, 303 clnp_option_rfd_lifetime_values, 304 clnp_option_rfd_pdu_discard_values, 305 clnp_option_rfd_reassembly_values, 306 NULL, 307 NULL, 308 NULL 309 }; 310 311 #define CLNP_OPTION_OPTION_QOS_MASK 0x3f 312 #define CLNP_OPTION_SCOPE_MASK 0xc0 313 #define CLNP_OPTION_SCOPE_SA_SPEC 0x40 314 #define CLNP_OPTION_SCOPE_DA_SPEC 0x80 315 #define CLNP_OPTION_SCOPE_GLOBAL 0xc0 316 317 static const struct tok clnp_option_scope_values[] = { 318 { CLNP_OPTION_SCOPE_SA_SPEC, "Source Address Specific"}, 319 { CLNP_OPTION_SCOPE_DA_SPEC, "Destination Address Specific"}, 320 { CLNP_OPTION_SCOPE_GLOBAL, "Globally unique"}, 321 { 0, NULL } 322 }; 323 324 static const struct tok clnp_option_sr_rr_values[] = { 325 { 0x0, "partial"}, 326 { 0x1, "complete"}, 327 { 0, NULL } 328 }; 329 330 static const struct tok clnp_option_sr_rr_string_values[] = { 331 { CLNP_OPTION_SOURCE_ROUTING, "source routing"}, 332 { CLNP_OPTION_ROUTE_RECORDING, "recording of route in progress"}, 333 { 0, NULL } 334 }; 335 336 static const struct tok clnp_option_qos_global_values[] = { 337 { 0x20, "reserved"}, 338 { 0x10, "sequencing vs. delay"}, 339 { 0x08, "congested"}, 340 { 0x04, "delay vs. cost"}, 341 { 0x02, "error vs. delay"}, 342 { 0x01, "error vs. cost"}, 343 { 0, NULL } 344 }; 345 346 #define ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* draft-ietf-isis-traffic-05 */ 347 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* rfc4205 */ 348 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* draft-ietf-isis-traffic-05 */ 349 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* draft-ietf-isis-traffic-05 */ 350 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* draft-ietf-isis-traffic-05 */ 351 #define ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* draft-ietf-isis-traffic-05 */ 352 #define ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* draft-ietf-isis-traffic-05 */ 353 #define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* rfc4124 */ 354 #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD 12 /* draft-ietf-tewg-diff-te-proto-06 */ 355 #define ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* draft-ietf-isis-traffic-05 */ 356 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE 19 /* draft-ietf-isis-link-attr-01 */ 357 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* rfc4205 */ 358 #define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* rfc4205 */ 359 #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS 22 /* rfc4124 */ 360 361 #define ISIS_SUBTLV_SPB_METRIC 29 /* rfc6329 */ 362 363 static const struct tok isis_ext_is_reach_subtlv_values[] = { 364 { ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP, "Administrative groups" }, 365 { ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" }, 366 { ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID, "Link Remote Identifier" }, 367 { ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR, "IPv4 interface address" }, 368 { ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR, "IPv4 neighbor address" }, 369 { ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW, "Maximum link bandwidth" }, 370 { ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW, "Reservable link bandwidth" }, 371 { ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW, "Unreserved bandwidth" }, 372 { ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC, "Traffic Engineering Metric" }, 373 { ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE, "Link Attribute" }, 374 { ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE, "Link Protection Type" }, 375 { ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR, "Interface Switching Capability" }, 376 { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD, "Bandwidth Constraints (old)" }, 377 { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS, "Bandwidth Constraints" }, 378 { ISIS_SUBTLV_SPB_METRIC, "SPB Metric" }, 379 { 250, "Reserved for cisco specific extensions" }, 380 { 251, "Reserved for cisco specific extensions" }, 381 { 252, "Reserved for cisco specific extensions" }, 382 { 253, "Reserved for cisco specific extensions" }, 383 { 254, "Reserved for cisco specific extensions" }, 384 { 255, "Reserved for future expansion" }, 385 { 0, NULL } 386 }; 387 388 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32 1 /* draft-ietf-isis-admin-tags-01 */ 389 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64 2 /* draft-ietf-isis-admin-tags-01 */ 390 #define ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR 117 /* draft-ietf-isis-wg-multi-topology-05 */ 391 392 static const struct tok isis_ext_ip_reach_subtlv_values[] = { 393 { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32, "32-Bit Administrative tag" }, 394 { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64, "64-Bit Administrative tag" }, 395 { ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR, "Management Prefix Color" }, 396 { 0, NULL } 397 }; 398 399 static const struct tok isis_subtlv_link_attribute_values[] = { 400 { 0x01, "Local Protection Available" }, 401 { 0x02, "Link excluded from local protection path" }, 402 { 0x04, "Local maintenance required"}, 403 { 0, NULL } 404 }; 405 406 #define ISIS_SUBTLV_AUTH_SIMPLE 1 407 #define ISIS_SUBTLV_AUTH_GENERIC 3 /* rfc 5310 */ 408 #define ISIS_SUBTLV_AUTH_MD5 54 409 #define ISIS_SUBTLV_AUTH_MD5_LEN 16 410 #define ISIS_SUBTLV_AUTH_PRIVATE 255 411 412 static const struct tok isis_subtlv_auth_values[] = { 413 { ISIS_SUBTLV_AUTH_SIMPLE, "simple text password"}, 414 { ISIS_SUBTLV_AUTH_GENERIC, "Generic Crypto key-id"}, 415 { ISIS_SUBTLV_AUTH_MD5, "HMAC-MD5 password"}, 416 { ISIS_SUBTLV_AUTH_PRIVATE, "Routing Domain private password"}, 417 { 0, NULL } 418 }; 419 420 #define ISIS_SUBTLV_IDRP_RES 0 421 #define ISIS_SUBTLV_IDRP_LOCAL 1 422 #define ISIS_SUBTLV_IDRP_ASN 2 423 424 static const struct tok isis_subtlv_idrp_values[] = { 425 { ISIS_SUBTLV_IDRP_RES, "Reserved"}, 426 { ISIS_SUBTLV_IDRP_LOCAL, "Routing-Domain Specific"}, 427 { ISIS_SUBTLV_IDRP_ASN, "AS Number Tag"}, 428 { 0, NULL} 429 }; 430 431 #define ISIS_SUBTLV_SPB_MCID 4 432 #define ISIS_SUBTLV_SPB_DIGEST 5 433 #define ISIS_SUBTLV_SPB_BVID 6 434 435 #define ISIS_SUBTLV_SPB_INSTANCE 1 436 #define ISIS_SUBTLV_SPBM_SI 3 437 438 #define ISIS_SPB_MCID_LEN 51 439 #define ISIS_SUBTLV_SPB_MCID_MIN_LEN 102 440 #define ISIS_SUBTLV_SPB_DIGEST_MIN_LEN 33 441 #define ISIS_SUBTLV_SPB_BVID_MIN_LEN 6 442 #define ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN 19 443 #define ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN 8 444 445 static const struct tok isis_mt_port_cap_subtlv_values[] = { 446 { ISIS_SUBTLV_SPB_MCID, "SPB MCID" }, 447 { ISIS_SUBTLV_SPB_DIGEST, "SPB Digest" }, 448 { ISIS_SUBTLV_SPB_BVID, "SPB BVID" }, 449 { 0, NULL } 450 }; 451 452 static const struct tok isis_mt_capability_subtlv_values[] = { 453 { ISIS_SUBTLV_SPB_INSTANCE, "SPB Instance" }, 454 { ISIS_SUBTLV_SPBM_SI, "SPBM Service Identifier and Unicast Address" }, 455 { 0, NULL } 456 }; 457 458 struct isis_spb_mcid { 459 uint8_t format_id; 460 uint8_t name[32]; 461 uint8_t revision_lvl[2]; 462 uint8_t digest[16]; 463 }; 464 465 struct isis_subtlv_spb_mcid { 466 struct isis_spb_mcid mcid; 467 struct isis_spb_mcid aux_mcid; 468 }; 469 470 struct isis_subtlv_spb_instance { 471 uint8_t cist_root_id[8]; 472 uint8_t cist_external_root_path_cost[4]; 473 uint8_t bridge_priority[2]; 474 uint8_t spsourceid[4]; 475 uint8_t no_of_trees; 476 }; 477 478 #define CLNP_SEGMENT_PART 0x80 479 #define CLNP_MORE_SEGMENTS 0x40 480 #define CLNP_REQUEST_ER 0x20 481 482 static const struct tok clnp_flag_values[] = { 483 { CLNP_SEGMENT_PART, "Segmentation permitted"}, 484 { CLNP_MORE_SEGMENTS, "more Segments"}, 485 { CLNP_REQUEST_ER, "request Error Report"}, 486 { 0, NULL} 487 }; 488 489 #define ISIS_MASK_LSP_OL_BIT(x) ((x)&0x4) 490 #define ISIS_MASK_LSP_ISTYPE_BITS(x) ((x)&0x3) 491 #define ISIS_MASK_LSP_PARTITION_BIT(x) ((x)&0x80) 492 #define ISIS_MASK_LSP_ATT_BITS(x) ((x)&0x78) 493 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x) ((x)&0x40) 494 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) ((x)&0x20) 495 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x) ((x)&0x10) 496 #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) ((x)&0x8) 497 498 #define ISIS_MASK_MTID(x) ((x)&0x0fff) 499 #define ISIS_MASK_MTFLAGS(x) ((x)&0xf000) 500 501 static const struct tok isis_mt_flag_values[] = { 502 { 0x4000, "ATT bit set"}, 503 { 0x8000, "Overload bit set"}, 504 { 0, NULL} 505 }; 506 507 #define ISIS_MASK_TLV_EXTD_IP_UPDOWN(x) ((x)&0x80) 508 #define ISIS_MASK_TLV_EXTD_IP_SUBTLV(x) ((x)&0x40) 509 510 #define ISIS_MASK_TLV_EXTD_IP6_IE(x) ((x)&0x40) 511 #define ISIS_MASK_TLV_EXTD_IP6_SUBTLV(x) ((x)&0x20) 512 513 #define ISIS_LSP_TLV_METRIC_SUPPORTED(x) ((x)&0x80) 514 #define ISIS_LSP_TLV_METRIC_IE(x) ((x)&0x40) 515 #define ISIS_LSP_TLV_METRIC_UPDOWN(x) ((x)&0x80) 516 #define ISIS_LSP_TLV_METRIC_VALUE(x) ((x)&0x3f) 517 518 #define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1) 519 520 static const struct tok isis_mt_values[] = { 521 { 0, "IPv4 unicast"}, 522 { 1, "In-Band Management"}, 523 { 2, "IPv6 unicast"}, 524 { 3, "Multicast"}, 525 { 4095, "Development, Experimental or Proprietary"}, 526 { 0, NULL } 527 }; 528 529 static const struct tok isis_iih_circuit_type_values[] = { 530 { 1, "Level 1 only"}, 531 { 2, "Level 2 only"}, 532 { 3, "Level 1, Level 2"}, 533 { 0, NULL} 534 }; 535 536 #define ISIS_LSP_TYPE_UNUSED0 0 537 #define ISIS_LSP_TYPE_LEVEL_1 1 538 #define ISIS_LSP_TYPE_UNUSED2 2 539 #define ISIS_LSP_TYPE_LEVEL_2 3 540 541 static const struct tok isis_lsp_istype_values[] = { 542 { ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"}, 543 { ISIS_LSP_TYPE_LEVEL_1, "L1 IS"}, 544 { ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"}, 545 { ISIS_LSP_TYPE_LEVEL_2, "L2 IS"}, 546 { 0, NULL } 547 }; 548 549 /* 550 * Katz's point to point adjacency TLV uses codes to tell us the state of 551 * the remote adjacency. Enumerate them. 552 */ 553 554 #define ISIS_PTP_ADJ_UP 0 555 #define ISIS_PTP_ADJ_INIT 1 556 #define ISIS_PTP_ADJ_DOWN 2 557 558 static const struct tok isis_ptp_adjancey_values[] = { 559 { ISIS_PTP_ADJ_UP, "Up" }, 560 { ISIS_PTP_ADJ_INIT, "Initializing" }, 561 { ISIS_PTP_ADJ_DOWN, "Down" }, 562 { 0, NULL} 563 }; 564 565 struct isis_tlv_ptp_adj { 566 uint8_t adjacency_state; 567 uint8_t extd_local_circuit_id[4]; 568 uint8_t neighbor_sysid[SYSTEM_ID_LEN]; 569 uint8_t neighbor_extd_local_circuit_id[4]; 570 }; 571 572 static void osi_print_cksum(netdissect_options *, const uint8_t *pptr, 573 uint16_t checksum, int checksum_offset, u_int length); 574 static int clnp_print(netdissect_options *, const uint8_t *, u_int); 575 static void esis_print(netdissect_options *, const uint8_t *, u_int); 576 static int isis_print(netdissect_options *, const uint8_t *, u_int); 577 578 struct isis_metric_block { 579 uint8_t metric_default; 580 uint8_t metric_delay; 581 uint8_t metric_expense; 582 uint8_t metric_error; 583 }; 584 585 struct isis_tlv_is_reach { 586 struct isis_metric_block isis_metric_block; 587 uint8_t neighbor_nodeid[NODE_ID_LEN]; 588 }; 589 590 struct isis_tlv_es_reach { 591 struct isis_metric_block isis_metric_block; 592 uint8_t neighbor_sysid[SYSTEM_ID_LEN]; 593 }; 594 595 struct isis_tlv_ip_reach { 596 struct isis_metric_block isis_metric_block; 597 uint8_t prefix[4]; 598 uint8_t mask[4]; 599 }; 600 601 static const struct tok isis_is_reach_virtual_values[] = { 602 { 0, "IsNotVirtual"}, 603 { 1, "IsVirtual"}, 604 { 0, NULL } 605 }; 606 607 static const struct tok isis_restart_flag_values[] = { 608 { 0x1, "Restart Request"}, 609 { 0x2, "Restart Acknowledgement"}, 610 { 0x4, "Suppress adjacency advertisement"}, 611 { 0, NULL } 612 }; 613 614 struct isis_common_header { 615 uint8_t nlpid; 616 uint8_t fixed_len; 617 uint8_t version; /* Protocol version */ 618 uint8_t id_length; 619 uint8_t pdu_type; /* 3 MSbits are reserved */ 620 uint8_t pdu_version; /* Packet format version */ 621 uint8_t reserved; 622 uint8_t max_area; 623 }; 624 625 struct isis_iih_lan_header { 626 uint8_t circuit_type; 627 uint8_t source_id[SYSTEM_ID_LEN]; 628 uint8_t holding_time[2]; 629 uint8_t pdu_len[2]; 630 uint8_t priority; 631 uint8_t lan_id[NODE_ID_LEN]; 632 }; 633 634 struct isis_iih_ptp_header { 635 uint8_t circuit_type; 636 uint8_t source_id[SYSTEM_ID_LEN]; 637 uint8_t holding_time[2]; 638 uint8_t pdu_len[2]; 639 uint8_t circuit_id; 640 }; 641 642 struct isis_lsp_header { 643 uint8_t pdu_len[2]; 644 uint8_t remaining_lifetime[2]; 645 uint8_t lsp_id[LSP_ID_LEN]; 646 uint8_t sequence_number[4]; 647 uint8_t checksum[2]; 648 uint8_t typeblock; 649 }; 650 651 struct isis_csnp_header { 652 uint8_t pdu_len[2]; 653 uint8_t source_id[NODE_ID_LEN]; 654 uint8_t start_lsp_id[LSP_ID_LEN]; 655 uint8_t end_lsp_id[LSP_ID_LEN]; 656 }; 657 658 struct isis_psnp_header { 659 uint8_t pdu_len[2]; 660 uint8_t source_id[NODE_ID_LEN]; 661 }; 662 663 struct isis_tlv_lsp { 664 uint8_t remaining_lifetime[2]; 665 uint8_t lsp_id[LSP_ID_LEN]; 666 uint8_t sequence_number[4]; 667 uint8_t checksum[2]; 668 }; 669 670 #define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header)) 671 #define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header)) 672 #define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header)) 673 #define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header)) 674 #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header)) 675 #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header)) 676 677 void 678 isoclns_print(netdissect_options *ndo, const uint8_t *p, u_int length) 679 { 680 if (!ND_TTEST(*p)) { /* enough bytes on the wire ? */ 681 ND_PRINT((ndo, "|OSI")); 682 return; 683 } 684 685 if (ndo->ndo_eflag) 686 ND_PRINT((ndo, "OSI NLPID %s (0x%02x): ", tok2str(nlpid_values, "Unknown", *p), *p)); 687 688 switch (*p) { 689 690 case NLPID_CLNP: 691 if (!clnp_print(ndo, p, length)) 692 print_unknown_data(ndo, p, "\n\t", length); 693 break; 694 695 case NLPID_ESIS: 696 esis_print(ndo, p, length); 697 return; 698 699 case NLPID_ISIS: 700 if (!isis_print(ndo, p, length)) 701 print_unknown_data(ndo, p, "\n\t", length); 702 break; 703 704 case NLPID_NULLNS: 705 ND_PRINT((ndo, "%slength: %u", ndo->ndo_eflag ? "" : ", ", length)); 706 break; 707 708 case NLPID_Q933: 709 q933_print(ndo, p + 1, length - 1); 710 break; 711 712 case NLPID_IP: 713 ip_print(ndo, p + 1, length - 1); 714 break; 715 716 case NLPID_IP6: 717 ip6_print(ndo, p + 1, length - 1); 718 break; 719 720 case NLPID_PPP: 721 ppp_print(ndo, p + 1, length - 1); 722 break; 723 724 default: 725 if (!ndo->ndo_eflag) 726 ND_PRINT((ndo, "OSI NLPID 0x%02x unknown", *p)); 727 ND_PRINT((ndo, "%slength: %u", ndo->ndo_eflag ? "" : ", ", length)); 728 if (length > 1) 729 print_unknown_data(ndo, p, "\n\t", length); 730 break; 731 } 732 } 733 734 #define CLNP_PDU_ER 1 735 #define CLNP_PDU_DT 28 736 #define CLNP_PDU_MD 29 737 #define CLNP_PDU_ERQ 30 738 #define CLNP_PDU_ERP 31 739 740 static const struct tok clnp_pdu_values[] = { 741 { CLNP_PDU_ER, "Error Report"}, 742 { CLNP_PDU_MD, "MD"}, 743 { CLNP_PDU_DT, "Data"}, 744 { CLNP_PDU_ERQ, "Echo Request"}, 745 { CLNP_PDU_ERP, "Echo Response"}, 746 { 0, NULL } 747 }; 748 749 struct clnp_header_t { 750 uint8_t nlpid; 751 uint8_t length_indicator; 752 uint8_t version; 753 uint8_t lifetime; /* units of 500ms */ 754 uint8_t type; 755 uint8_t segment_length[2]; 756 uint8_t cksum[2]; 757 }; 758 759 struct clnp_segment_header_t { 760 uint8_t data_unit_id[2]; 761 uint8_t segment_offset[2]; 762 uint8_t total_length[2]; 763 }; 764 765 /* 766 * clnp_print 767 * Decode CLNP packets. Return 0 on error. 768 */ 769 770 static int 771 clnp_print(netdissect_options *ndo, 772 const uint8_t *pptr, u_int length) 773 { 774 const uint8_t *optr,*source_address,*dest_address; 775 u_int li,tlen,nsap_offset,source_address_length,dest_address_length, clnp_pdu_type, clnp_flags; 776 const struct clnp_header_t *clnp_header; 777 const struct clnp_segment_header_t *clnp_segment_header; 778 uint8_t rfd_error_major,rfd_error_minor; 779 780 clnp_header = (const struct clnp_header_t *) pptr; 781 ND_TCHECK(*clnp_header); 782 783 li = clnp_header->length_indicator; 784 optr = pptr; 785 786 if (!ndo->ndo_eflag) 787 ND_PRINT((ndo, "CLNP")); 788 789 /* 790 * Sanity checking of the header. 791 */ 792 793 if (clnp_header->version != CLNP_VERSION) { 794 ND_PRINT((ndo, "version %d packet not supported", clnp_header->version)); 795 return (0); 796 } 797 798 if (li > length) { 799 ND_PRINT((ndo, " length indicator(%u) > PDU size (%u)!", li, length)); 800 return (0); 801 } 802 803 if (li < sizeof(struct clnp_header_t)) { 804 ND_PRINT((ndo, " length indicator %u < min PDU size:", li)); 805 while (pptr < ndo->ndo_snapend) 806 ND_PRINT((ndo, "%02X", *pptr++)); 807 return (0); 808 } 809 810 /* FIXME further header sanity checking */ 811 812 clnp_pdu_type = clnp_header->type & CLNP_PDU_TYPE_MASK; 813 clnp_flags = clnp_header->type & CLNP_FLAG_MASK; 814 815 pptr += sizeof(struct clnp_header_t); 816 li -= sizeof(struct clnp_header_t); 817 818 if (li < 1) { 819 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses")); 820 return (0); 821 } 822 ND_TCHECK(*pptr); 823 dest_address_length = *pptr; 824 pptr += 1; 825 li -= 1; 826 if (li < dest_address_length) { 827 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses")); 828 return (0); 829 } 830 ND_TCHECK2(*pptr, dest_address_length); 831 dest_address = pptr; 832 pptr += dest_address_length; 833 li -= dest_address_length; 834 835 if (li < 1) { 836 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses")); 837 return (0); 838 } 839 ND_TCHECK(*pptr); 840 source_address_length = *pptr; 841 pptr += 1; 842 li -= 1; 843 if (li < source_address_length) { 844 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses")); 845 return (0); 846 } 847 ND_TCHECK2(*pptr, source_address_length); 848 source_address = pptr; 849 pptr += source_address_length; 850 li -= source_address_length; 851 852 if (ndo->ndo_vflag < 1) { 853 ND_PRINT((ndo, "%s%s > %s, %s, length %u", 854 ndo->ndo_eflag ? "" : ", ", 855 isonsap_string(ndo, source_address, source_address_length), 856 isonsap_string(ndo, dest_address, dest_address_length), 857 tok2str(clnp_pdu_values,"unknown (%u)",clnp_pdu_type), 858 length)); 859 return (1); 860 } 861 ND_PRINT((ndo, "%slength %u", ndo->ndo_eflag ? "" : ", ", length)); 862 863 ND_PRINT((ndo, "\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x", 864 tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type), 865 clnp_header->length_indicator, 866 clnp_header->version, 867 clnp_header->lifetime/2, 868 (clnp_header->lifetime%2)*5, 869 EXTRACT_16BITS(clnp_header->segment_length), 870 EXTRACT_16BITS(clnp_header->cksum))); 871 872 osi_print_cksum(ndo, optr, EXTRACT_16BITS(clnp_header->cksum), 7, 873 clnp_header->length_indicator); 874 875 ND_PRINT((ndo, "\n\tFlags [%s]", 876 bittok2str(clnp_flag_values, "none", clnp_flags))); 877 878 ND_PRINT((ndo, "\n\tsource address (length %u): %s\n\tdest address (length %u): %s", 879 source_address_length, 880 isonsap_string(ndo, source_address, source_address_length), 881 dest_address_length, 882 isonsap_string(ndo, dest_address, dest_address_length))); 883 884 if (clnp_flags & CLNP_SEGMENT_PART) { 885 if (li < sizeof(const struct clnp_segment_header_t)) { 886 ND_PRINT((ndo, "li < size of fixed part of CLNP header, addresses, and segment part")); 887 return (0); 888 } 889 clnp_segment_header = (const struct clnp_segment_header_t *) pptr; 890 ND_TCHECK(*clnp_segment_header); 891 ND_PRINT((ndo, "\n\tData Unit ID: 0x%04x, Segment Offset: %u, Total PDU Length: %u", 892 EXTRACT_16BITS(clnp_segment_header->data_unit_id), 893 EXTRACT_16BITS(clnp_segment_header->segment_offset), 894 EXTRACT_16BITS(clnp_segment_header->total_length))); 895 pptr+=sizeof(const struct clnp_segment_header_t); 896 li-=sizeof(const struct clnp_segment_header_t); 897 } 898 899 /* now walk the options */ 900 while (li >= 2) { 901 u_int op, opli; 902 const uint8_t *tptr; 903 904 if (li < 2) { 905 ND_PRINT((ndo, ", bad opts/li")); 906 return (0); 907 } 908 ND_TCHECK2(*pptr, 2); 909 op = *pptr++; 910 opli = *pptr++; 911 li -= 2; 912 if (opli > li) { 913 ND_PRINT((ndo, ", opt (%d) too long", op)); 914 return (0); 915 } 916 ND_TCHECK2(*pptr, opli); 917 li -= opli; 918 tptr = pptr; 919 tlen = opli; 920 921 ND_PRINT((ndo, "\n\t %s Option #%u, length %u, value: ", 922 tok2str(clnp_option_values,"Unknown",op), 923 op, 924 opli)); 925 926 /* 927 * We've already checked that the entire option is present 928 * in the captured packet with the ND_TCHECK2() call. 929 * Therefore, we don't need to do ND_TCHECK()/ND_TCHECK2() 930 * checks. 931 * We do, however, need to check tlen, to make sure we 932 * don't run past the end of the option. 933 */ 934 switch (op) { 935 936 937 case CLNP_OPTION_ROUTE_RECORDING: /* those two options share the format */ 938 case CLNP_OPTION_SOURCE_ROUTING: 939 if (tlen < 2) { 940 ND_PRINT((ndo, ", bad opt len")); 941 return (0); 942 } 943 ND_PRINT((ndo, "%s %s", 944 tok2str(clnp_option_sr_rr_values,"Unknown",*tptr), 945 tok2str(clnp_option_sr_rr_string_values, "Unknown Option %u", op))); 946 nsap_offset=*(tptr+1); 947 if (nsap_offset == 0) { 948 ND_PRINT((ndo, " Bad NSAP offset (0)")); 949 break; 950 } 951 nsap_offset-=1; /* offset to nsap list */ 952 if (nsap_offset > tlen) { 953 ND_PRINT((ndo, " Bad NSAP offset (past end of option)")); 954 break; 955 } 956 tptr+=nsap_offset; 957 tlen-=nsap_offset; 958 while (tlen > 0) { 959 source_address_length=*tptr; 960 if (tlen < source_address_length+1) { 961 ND_PRINT((ndo, "\n\t NSAP address goes past end of option")); 962 break; 963 } 964 if (source_address_length > 0) { 965 source_address=(tptr+1); 966 ND_TCHECK2(*source_address, source_address_length); 967 ND_PRINT((ndo, "\n\t NSAP address (length %u): %s", 968 source_address_length, 969 isonsap_string(ndo, source_address, source_address_length))); 970 } 971 tlen-=source_address_length+1; 972 } 973 break; 974 975 case CLNP_OPTION_PRIORITY: 976 if (tlen < 1) { 977 ND_PRINT((ndo, ", bad opt len")); 978 return (0); 979 } 980 ND_PRINT((ndo, "0x%1x", *tptr&0x0f)); 981 break; 982 983 case CLNP_OPTION_QOS_MAINTENANCE: 984 if (tlen < 1) { 985 ND_PRINT((ndo, ", bad opt len")); 986 return (0); 987 } 988 ND_PRINT((ndo, "\n\t Format Code: %s", 989 tok2str(clnp_option_scope_values, "Reserved", *tptr&CLNP_OPTION_SCOPE_MASK))); 990 991 if ((*tptr&CLNP_OPTION_SCOPE_MASK) == CLNP_OPTION_SCOPE_GLOBAL) 992 ND_PRINT((ndo, "\n\t QoS Flags [%s]", 993 bittok2str(clnp_option_qos_global_values, 994 "none", 995 *tptr&CLNP_OPTION_OPTION_QOS_MASK))); 996 break; 997 998 case CLNP_OPTION_SECURITY: 999 if (tlen < 2) { 1000 ND_PRINT((ndo, ", bad opt len")); 1001 return (0); 1002 } 1003 ND_PRINT((ndo, "\n\t Format Code: %s, Security-Level %u", 1004 tok2str(clnp_option_scope_values,"Reserved",*tptr&CLNP_OPTION_SCOPE_MASK), 1005 *(tptr+1))); 1006 break; 1007 1008 case CLNP_OPTION_DISCARD_REASON: 1009 if (tlen < 1) { 1010 ND_PRINT((ndo, ", bad opt len")); 1011 return (0); 1012 } 1013 rfd_error_major = (*tptr&0xf0) >> 4; 1014 rfd_error_minor = *tptr&0x0f; 1015 ND_PRINT((ndo, "\n\t Class: %s Error (0x%01x), %s (0x%01x)", 1016 tok2str(clnp_option_rfd_class_values,"Unknown",rfd_error_major), 1017 rfd_error_major, 1018 tok2str(clnp_option_rfd_error_class[rfd_error_major],"Unknown",rfd_error_minor), 1019 rfd_error_minor)); 1020 break; 1021 1022 case CLNP_OPTION_PADDING: 1023 ND_PRINT((ndo, "padding data")); 1024 break; 1025 1026 /* 1027 * FIXME those are the defined Options that lack a decoder 1028 * you are welcome to contribute code ;-) 1029 */ 1030 1031 default: 1032 print_unknown_data(ndo, tptr, "\n\t ", opli); 1033 break; 1034 } 1035 if (ndo->ndo_vflag > 1) 1036 print_unknown_data(ndo, pptr, "\n\t ", opli); 1037 pptr += opli; 1038 } 1039 1040 switch (clnp_pdu_type) { 1041 1042 case CLNP_PDU_ER: /* fall through */ 1043 case CLNP_PDU_ERP: 1044 ND_TCHECK(*pptr); 1045 if (*(pptr) == NLPID_CLNP) { 1046 ND_PRINT((ndo, "\n\t-----original packet-----\n\t")); 1047 /* FIXME recursion protection */ 1048 clnp_print(ndo, pptr, length - clnp_header->length_indicator); 1049 break; 1050 } 1051 1052 case CLNP_PDU_DT: 1053 case CLNP_PDU_MD: 1054 case CLNP_PDU_ERQ: 1055 1056 default: 1057 /* dump the PDU specific data */ 1058 if (length-(pptr-optr) > 0) { 1059 ND_PRINT((ndo, "\n\t undecoded non-header data, length %u", length-clnp_header->length_indicator)); 1060 print_unknown_data(ndo, pptr, "\n\t ", length - (pptr - optr)); 1061 } 1062 } 1063 1064 return (1); 1065 1066 trunc: 1067 ND_PRINT((ndo, "[|clnp]")); 1068 return (1); 1069 1070 } 1071 1072 1073 #define ESIS_PDU_REDIRECT 6 1074 #define ESIS_PDU_ESH 2 1075 #define ESIS_PDU_ISH 4 1076 1077 static const struct tok esis_pdu_values[] = { 1078 { ESIS_PDU_REDIRECT, "redirect"}, 1079 { ESIS_PDU_ESH, "ESH"}, 1080 { ESIS_PDU_ISH, "ISH"}, 1081 { 0, NULL } 1082 }; 1083 1084 struct esis_header_t { 1085 uint8_t nlpid; 1086 uint8_t length_indicator; 1087 uint8_t version; 1088 uint8_t reserved; 1089 uint8_t type; 1090 uint8_t holdtime[2]; 1091 uint8_t cksum[2]; 1092 }; 1093 1094 static void 1095 esis_print(netdissect_options *ndo, 1096 const uint8_t *pptr, u_int length) 1097 { 1098 const uint8_t *optr; 1099 u_int li,esis_pdu_type,source_address_length, source_address_number; 1100 const struct esis_header_t *esis_header; 1101 1102 if (!ndo->ndo_eflag) 1103 ND_PRINT((ndo, "ES-IS")); 1104 1105 if (length <= 2) { 1106 ND_PRINT((ndo, ndo->ndo_qflag ? "bad pkt!" : "no header at all!")); 1107 return; 1108 } 1109 1110 esis_header = (const struct esis_header_t *) pptr; 1111 ND_TCHECK(*esis_header); 1112 li = esis_header->length_indicator; 1113 optr = pptr; 1114 1115 /* 1116 * Sanity checking of the header. 1117 */ 1118 1119 if (esis_header->nlpid != NLPID_ESIS) { 1120 ND_PRINT((ndo, " nlpid 0x%02x packet not supported", esis_header->nlpid)); 1121 return; 1122 } 1123 1124 if (esis_header->version != ESIS_VERSION) { 1125 ND_PRINT((ndo, " version %d packet not supported", esis_header->version)); 1126 return; 1127 } 1128 1129 if (li > length) { 1130 ND_PRINT((ndo, " length indicator(%u) > PDU size (%u)!", li, length)); 1131 return; 1132 } 1133 1134 if (li < sizeof(struct esis_header_t) + 2) { 1135 ND_PRINT((ndo, " length indicator %u < min PDU size:", li)); 1136 while (pptr < ndo->ndo_snapend) 1137 ND_PRINT((ndo, "%02X", *pptr++)); 1138 return; 1139 } 1140 1141 esis_pdu_type = esis_header->type & ESIS_PDU_TYPE_MASK; 1142 1143 if (ndo->ndo_vflag < 1) { 1144 ND_PRINT((ndo, "%s%s, length %u", 1145 ndo->ndo_eflag ? "" : ", ", 1146 tok2str(esis_pdu_values,"unknown type (%u)",esis_pdu_type), 1147 length)); 1148 return; 1149 } else 1150 ND_PRINT((ndo, "%slength %u\n\t%s (%u)", 1151 ndo->ndo_eflag ? "" : ", ", 1152 length, 1153 tok2str(esis_pdu_values,"unknown type: %u", esis_pdu_type), 1154 esis_pdu_type)); 1155 1156 ND_PRINT((ndo, ", v: %u%s", esis_header->version, esis_header->version == ESIS_VERSION ? "" : "unsupported" )); 1157 ND_PRINT((ndo, ", checksum: 0x%04x", EXTRACT_16BITS(esis_header->cksum))); 1158 1159 osi_print_cksum(ndo, pptr, EXTRACT_16BITS(esis_header->cksum), 7, li); 1160 1161 ND_PRINT((ndo, ", holding time: %us, length indicator: %u", 1162 EXTRACT_16BITS(esis_header->holdtime), li)); 1163 1164 if (ndo->ndo_vflag > 1) 1165 print_unknown_data(ndo, optr, "\n\t", sizeof(struct esis_header_t)); 1166 1167 pptr += sizeof(struct esis_header_t); 1168 li -= sizeof(struct esis_header_t); 1169 1170 switch (esis_pdu_type) { 1171 case ESIS_PDU_REDIRECT: { 1172 const uint8_t *dst, *snpa, *neta; 1173 u_int dstl, snpal, netal; 1174 1175 ND_TCHECK(*pptr); 1176 if (li < 1) { 1177 ND_PRINT((ndo, ", bad redirect/li")); 1178 return; 1179 } 1180 dstl = *pptr; 1181 pptr++; 1182 li--; 1183 ND_TCHECK2(*pptr, dstl); 1184 if (li < dstl) { 1185 ND_PRINT((ndo, ", bad redirect/li")); 1186 return; 1187 } 1188 dst = pptr; 1189 pptr += dstl; 1190 li -= dstl; 1191 ND_PRINT((ndo, "\n\t %s", isonsap_string(ndo, dst, dstl))); 1192 1193 ND_TCHECK(*pptr); 1194 if (li < 1) { 1195 ND_PRINT((ndo, ", bad redirect/li")); 1196 return; 1197 } 1198 snpal = *pptr; 1199 pptr++; 1200 li--; 1201 ND_TCHECK2(*pptr, snpal); 1202 if (li < snpal) { 1203 ND_PRINT((ndo, ", bad redirect/li")); 1204 return; 1205 } 1206 snpa = pptr; 1207 pptr += snpal; 1208 li -= snpal; 1209 ND_TCHECK(*pptr); 1210 if (li < 1) { 1211 ND_PRINT((ndo, ", bad redirect/li")); 1212 return; 1213 } 1214 netal = *pptr; 1215 pptr++; 1216 ND_TCHECK2(*pptr, netal); 1217 if (li < netal) { 1218 ND_PRINT((ndo, ", bad redirect/li")); 1219 return; 1220 } 1221 neta = pptr; 1222 pptr += netal; 1223 li -= netal; 1224 1225 if (snpal == 6) 1226 ND_PRINT((ndo, "\n\t SNPA (length: %u): %s", 1227 snpal, 1228 etheraddr_string(ndo, snpa))); 1229 else 1230 ND_PRINT((ndo, "\n\t SNPA (length: %u): %s", 1231 snpal, 1232 linkaddr_string(ndo, snpa, LINKADDR_OTHER, snpal))); 1233 if (netal != 0) 1234 ND_PRINT((ndo, "\n\t NET (length: %u) %s", 1235 netal, 1236 isonsap_string(ndo, neta, netal))); 1237 break; 1238 } 1239 1240 case ESIS_PDU_ESH: 1241 ND_TCHECK(*pptr); 1242 if (li < 1) { 1243 ND_PRINT((ndo, ", bad esh/li")); 1244 return; 1245 } 1246 source_address_number = *pptr; 1247 pptr++; 1248 li--; 1249 1250 ND_PRINT((ndo, "\n\t Number of Source Addresses: %u", source_address_number)); 1251 1252 while (source_address_number > 0) { 1253 ND_TCHECK(*pptr); 1254 if (li < 1) { 1255 ND_PRINT((ndo, ", bad esh/li")); 1256 return; 1257 } 1258 source_address_length = *pptr; 1259 pptr++; 1260 li--; 1261 1262 ND_TCHECK2(*pptr, source_address_length); 1263 if (li < source_address_length) { 1264 ND_PRINT((ndo, ", bad esh/li")); 1265 return; 1266 } 1267 ND_PRINT((ndo, "\n\t NET (length: %u): %s", 1268 source_address_length, 1269 isonsap_string(ndo, pptr, source_address_length))); 1270 pptr += source_address_length; 1271 li -= source_address_length; 1272 source_address_number--; 1273 } 1274 1275 break; 1276 1277 case ESIS_PDU_ISH: { 1278 ND_TCHECK(*pptr); 1279 if (li < 1) { 1280 ND_PRINT((ndo, ", bad ish/li")); 1281 return; 1282 } 1283 source_address_length = *pptr; 1284 pptr++; 1285 li--; 1286 ND_TCHECK2(*pptr, source_address_length); 1287 if (li < source_address_length) { 1288 ND_PRINT((ndo, ", bad ish/li")); 1289 return; 1290 } 1291 ND_PRINT((ndo, "\n\t NET (length: %u): %s", source_address_length, isonsap_string(ndo, pptr, source_address_length))); 1292 pptr += source_address_length; 1293 li -= source_address_length; 1294 break; 1295 } 1296 1297 default: 1298 if (ndo->ndo_vflag <= 1) { 1299 if (pptr < ndo->ndo_snapend) 1300 print_unknown_data(ndo, pptr, "\n\t ", ndo->ndo_snapend - pptr); 1301 } 1302 return; 1303 } 1304 1305 /* now walk the options */ 1306 while (li != 0) { 1307 u_int op, opli; 1308 const uint8_t *tptr; 1309 1310 if (li < 2) { 1311 ND_PRINT((ndo, ", bad opts/li")); 1312 return; 1313 } 1314 ND_TCHECK2(*pptr, 2); 1315 op = *pptr++; 1316 opli = *pptr++; 1317 li -= 2; 1318 if (opli > li) { 1319 ND_PRINT((ndo, ", opt (%d) too long", op)); 1320 return; 1321 } 1322 li -= opli; 1323 tptr = pptr; 1324 1325 ND_PRINT((ndo, "\n\t %s Option #%u, length %u, value: ", 1326 tok2str(esis_option_values,"Unknown",op), 1327 op, 1328 opli)); 1329 1330 switch (op) { 1331 1332 case ESIS_OPTION_ES_CONF_TIME: 1333 if (opli == 2) { 1334 ND_TCHECK2(*pptr, 2); 1335 ND_PRINT((ndo, "%us", EXTRACT_16BITS(tptr))); 1336 } else 1337 ND_PRINT((ndo, "(bad length)")); 1338 break; 1339 1340 case ESIS_OPTION_PROTOCOLS: 1341 while (opli>0) { 1342 ND_TCHECK(*tptr); 1343 ND_PRINT((ndo, "%s (0x%02x)", 1344 tok2str(nlpid_values, 1345 "unknown", 1346 *tptr), 1347 *tptr)); 1348 if (opli>1) /* further NPLIDs ? - put comma */ 1349 ND_PRINT((ndo, ", ")); 1350 tptr++; 1351 opli--; 1352 } 1353 break; 1354 1355 /* 1356 * FIXME those are the defined Options that lack a decoder 1357 * you are welcome to contribute code ;-) 1358 */ 1359 1360 case ESIS_OPTION_QOS_MAINTENANCE: 1361 case ESIS_OPTION_SECURITY: 1362 case ESIS_OPTION_PRIORITY: 1363 case ESIS_OPTION_ADDRESS_MASK: 1364 case ESIS_OPTION_SNPA_MASK: 1365 1366 default: 1367 print_unknown_data(ndo, tptr, "\n\t ", opli); 1368 break; 1369 } 1370 if (ndo->ndo_vflag > 1) 1371 print_unknown_data(ndo, pptr, "\n\t ", opli); 1372 pptr += opli; 1373 } 1374 trunc: 1375 ND_PRINT((ndo, "[|esis]")); 1376 } 1377 1378 static void 1379 isis_print_mcid(netdissect_options *ndo, 1380 const struct isis_spb_mcid *mcid) 1381 { 1382 int i; 1383 1384 ND_TCHECK(*mcid); 1385 ND_PRINT((ndo, "ID: %d, Name: ", mcid->format_id)); 1386 1387 if (fn_printzp(ndo, mcid->name, 32, ndo->ndo_snapend)) 1388 goto trunc; 1389 1390 ND_PRINT((ndo, "\n\t Lvl: %d", EXTRACT_16BITS(mcid->revision_lvl))); 1391 1392 ND_PRINT((ndo, ", Digest: ")); 1393 1394 for(i=0;i<16;i++) 1395 ND_PRINT((ndo, "%.2x ", mcid->digest[i])); 1396 1397 trunc: 1398 ND_PRINT((ndo, "%s", tstr)); 1399 } 1400 1401 static int 1402 isis_print_mt_port_cap_subtlv(netdissect_options *ndo, 1403 const uint8_t *tptr, int len) 1404 { 1405 int stlv_type, stlv_len; 1406 const struct isis_subtlv_spb_mcid *subtlv_spb_mcid; 1407 int i; 1408 1409 while (len > 2) 1410 { 1411 ND_TCHECK2(*tptr, 2); 1412 stlv_type = *(tptr++); 1413 stlv_len = *(tptr++); 1414 1415 /* first lets see if we know the subTLVs name*/ 1416 ND_PRINT((ndo, "\n\t %s subTLV #%u, length: %u", 1417 tok2str(isis_mt_port_cap_subtlv_values, "unknown", stlv_type), 1418 stlv_type, 1419 stlv_len)); 1420 1421 /*len -= TLV_TYPE_LEN_OFFSET;*/ 1422 len = len -2; 1423 1424 /* Make sure the subTLV fits within the space left */ 1425 if (len < stlv_len) 1426 goto trunc; 1427 /* Make sure the entire subTLV is in the captured data */ 1428 ND_TCHECK2(*(tptr), stlv_len); 1429 1430 switch (stlv_type) 1431 { 1432 case ISIS_SUBTLV_SPB_MCID: 1433 { 1434 if (stlv_len < ISIS_SUBTLV_SPB_MCID_MIN_LEN) 1435 goto trunc; 1436 1437 subtlv_spb_mcid = (const struct isis_subtlv_spb_mcid *)tptr; 1438 1439 ND_PRINT((ndo, "\n\t MCID: ")); 1440 isis_print_mcid(ndo, &(subtlv_spb_mcid->mcid)); 1441 1442 /*tptr += SPB_MCID_MIN_LEN; 1443 len -= SPB_MCID_MIN_LEN; */ 1444 1445 ND_PRINT((ndo, "\n\t AUX-MCID: ")); 1446 isis_print_mcid(ndo, &(subtlv_spb_mcid->aux_mcid)); 1447 1448 /*tptr += SPB_MCID_MIN_LEN; 1449 len -= SPB_MCID_MIN_LEN; */ 1450 tptr = tptr + ISIS_SUBTLV_SPB_MCID_MIN_LEN; 1451 len = len - ISIS_SUBTLV_SPB_MCID_MIN_LEN; 1452 stlv_len = stlv_len - ISIS_SUBTLV_SPB_MCID_MIN_LEN; 1453 1454 break; 1455 } 1456 1457 case ISIS_SUBTLV_SPB_DIGEST: 1458 { 1459 if (stlv_len < ISIS_SUBTLV_SPB_DIGEST_MIN_LEN) 1460 goto trunc; 1461 1462 ND_PRINT((ndo, "\n\t RES: %d V: %d A: %d D: %d", 1463 (*(tptr) >> 5), (((*tptr)>> 4) & 0x01), 1464 ((*(tptr) >> 2) & 0x03), ((*tptr) & 0x03))); 1465 1466 tptr++; 1467 1468 ND_PRINT((ndo, "\n\t Digest: ")); 1469 1470 for(i=1;i<=8; i++) 1471 { 1472 ND_PRINT((ndo, "%08x ", EXTRACT_32BITS(tptr))); 1473 if (i%4 == 0 && i != 8) 1474 ND_PRINT((ndo, "\n\t ")); 1475 tptr = tptr + 4; 1476 } 1477 1478 len = len - ISIS_SUBTLV_SPB_DIGEST_MIN_LEN; 1479 stlv_len = stlv_len - ISIS_SUBTLV_SPB_DIGEST_MIN_LEN; 1480 1481 break; 1482 } 1483 1484 case ISIS_SUBTLV_SPB_BVID: 1485 { 1486 while (stlv_len >= ISIS_SUBTLV_SPB_BVID_MIN_LEN) 1487 { 1488 ND_PRINT((ndo, "\n\t ECT: %08x", 1489 EXTRACT_32BITS(tptr))); 1490 1491 tptr = tptr+4; 1492 1493 ND_PRINT((ndo, " BVID: %d, U:%01x M:%01x ", 1494 (EXTRACT_16BITS (tptr) >> 4) , 1495 (EXTRACT_16BITS (tptr) >> 3) & 0x01, 1496 (EXTRACT_16BITS (tptr) >> 2) & 0x01)); 1497 1498 tptr = tptr + 2; 1499 len = len - ISIS_SUBTLV_SPB_BVID_MIN_LEN; 1500 stlv_len = stlv_len - ISIS_SUBTLV_SPB_BVID_MIN_LEN; 1501 } 1502 1503 break; 1504 } 1505 1506 default: 1507 break; 1508 } 1509 tptr += stlv_len; 1510 len -= stlv_len; 1511 } 1512 1513 return 0; 1514 1515 trunc: 1516 ND_PRINT((ndo, "\n\t\t")); 1517 ND_PRINT((ndo, "%s", tstr)); 1518 return(1); 1519 } 1520 1521 static int 1522 isis_print_mt_capability_subtlv(netdissect_options *ndo, 1523 const uint8_t *tptr, int len) 1524 { 1525 int stlv_type, stlv_len, tmp; 1526 1527 while (len > 2) 1528 { 1529 ND_TCHECK2(*tptr, 2); 1530 stlv_type = *(tptr++); 1531 stlv_len = *(tptr++); 1532 1533 /* first lets see if we know the subTLVs name*/ 1534 ND_PRINT((ndo, "\n\t %s subTLV #%u, length: %u", 1535 tok2str(isis_mt_capability_subtlv_values, "unknown", stlv_type), 1536 stlv_type, 1537 stlv_len)); 1538 1539 len = len - 2; 1540 1541 /* Make sure the subTLV fits within the space left */ 1542 if (len < stlv_len) 1543 goto trunc; 1544 /* Make sure the entire subTLV is in the captured data */ 1545 ND_TCHECK2(*(tptr), stlv_len); 1546 1547 switch (stlv_type) 1548 { 1549 case ISIS_SUBTLV_SPB_INSTANCE: 1550 if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN) 1551 goto trunc; 1552 1553 ND_PRINT((ndo, "\n\t CIST Root-ID: %08x", EXTRACT_32BITS(tptr))); 1554 tptr = tptr+4; 1555 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tptr))); 1556 tptr = tptr+4; 1557 ND_PRINT((ndo, ", Path Cost: %08x", EXTRACT_32BITS(tptr))); 1558 tptr = tptr+4; 1559 ND_PRINT((ndo, ", Prio: %d", EXTRACT_16BITS(tptr))); 1560 tptr = tptr + 2; 1561 ND_PRINT((ndo, "\n\t RES: %d", 1562 EXTRACT_16BITS(tptr) >> 5)); 1563 ND_PRINT((ndo, ", V: %d", 1564 (EXTRACT_16BITS(tptr) >> 4) & 0x0001)); 1565 ND_PRINT((ndo, ", SPSource-ID: %d", 1566 (EXTRACT_32BITS(tptr) & 0x000fffff))); 1567 tptr = tptr+4; 1568 ND_PRINT((ndo, ", No of Trees: %x", *(tptr))); 1569 1570 tmp = *(tptr++); 1571 1572 len = len - ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN; 1573 stlv_len = stlv_len - ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN; 1574 1575 while (tmp) 1576 { 1577 if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN) 1578 goto trunc; 1579 1580 ND_PRINT((ndo, "\n\t U:%d, M:%d, A:%d, RES:%d", 1581 *(tptr) >> 7, (*(tptr) >> 6) & 0x01, 1582 (*(tptr) >> 5) & 0x01, (*(tptr) & 0x1f))); 1583 1584 tptr++; 1585 1586 ND_PRINT((ndo, ", ECT: %08x", EXTRACT_32BITS(tptr))); 1587 1588 tptr = tptr + 4; 1589 1590 ND_PRINT((ndo, ", BVID: %d, SPVID: %d", 1591 (EXTRACT_24BITS(tptr) >> 12) & 0x000fff, 1592 EXTRACT_24BITS(tptr) & 0x000fff)); 1593 1594 tptr = tptr + 3; 1595 len = len - ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN; 1596 stlv_len = stlv_len - ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN; 1597 tmp--; 1598 } 1599 1600 break; 1601 1602 case ISIS_SUBTLV_SPBM_SI: 1603 if (stlv_len < 8) 1604 goto trunc; 1605 1606 ND_PRINT((ndo, "\n\t BMAC: %08x", EXTRACT_32BITS(tptr))); 1607 tptr = tptr+4; 1608 ND_PRINT((ndo, "%04x", EXTRACT_16BITS(tptr))); 1609 tptr = tptr+2; 1610 1611 ND_PRINT((ndo, ", RES: %d, VID: %d", EXTRACT_16BITS(tptr) >> 12, 1612 (EXTRACT_16BITS(tptr)) & 0x0fff)); 1613 1614 tptr = tptr+2; 1615 len = len - 8; 1616 stlv_len = stlv_len - 8; 1617 1618 while (stlv_len >= 4) { 1619 ND_TCHECK2(*tptr, 4); 1620 ND_PRINT((ndo, "\n\t T: %d, R: %d, RES: %d, ISID: %d", 1621 (EXTRACT_32BITS(tptr) >> 31), 1622 (EXTRACT_32BITS(tptr) >> 30) & 0x01, 1623 (EXTRACT_32BITS(tptr) >> 24) & 0x03f, 1624 (EXTRACT_32BITS(tptr)) & 0x0ffffff)); 1625 1626 tptr = tptr + 4; 1627 len = len - 4; 1628 stlv_len = stlv_len - 4; 1629 } 1630 1631 break; 1632 1633 default: 1634 break; 1635 } 1636 tptr += stlv_len; 1637 len -= stlv_len; 1638 } 1639 return 0; 1640 1641 trunc: 1642 ND_PRINT((ndo, "\n\t\t")); 1643 ND_PRINT((ndo, "%s", tstr)); 1644 return(1); 1645 } 1646 1647 /* shared routine for printing system, node and lsp-ids */ 1648 static char * 1649 isis_print_id(const uint8_t *cp, int id_len) 1650 { 1651 int i; 1652 static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")]; 1653 char *pos = id; 1654 int sysid_len; 1655 1656 sysid_len = SYSTEM_ID_LEN; 1657 if (sysid_len > id_len) 1658 sysid_len = id_len; 1659 for (i = 1; i <= sysid_len; i++) { 1660 snprintf(pos, sizeof(id) - (pos - id), "%02x", *cp++); 1661 pos += strlen(pos); 1662 if (i == 2 || i == 4) 1663 *pos++ = '.'; 1664 } 1665 if (id_len >= NODE_ID_LEN) { 1666 snprintf(pos, sizeof(id) - (pos - id), ".%02x", *cp++); 1667 pos += strlen(pos); 1668 } 1669 if (id_len == LSP_ID_LEN) 1670 snprintf(pos, sizeof(id) - (pos - id), "-%02x", *cp); 1671 return (id); 1672 } 1673 1674 /* print the 4-byte metric block which is common found in the old-style TLVs */ 1675 static int 1676 isis_print_metric_block(netdissect_options *ndo, 1677 const struct isis_metric_block *isis_metric_block) 1678 { 1679 ND_PRINT((ndo, ", Default Metric: %d, %s", 1680 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default), 1681 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal")); 1682 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay)) 1683 ND_PRINT((ndo, "\n\t\t Delay Metric: %d, %s", 1684 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay), 1685 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal")); 1686 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense)) 1687 ND_PRINT((ndo, "\n\t\t Expense Metric: %d, %s", 1688 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense), 1689 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal")); 1690 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error)) 1691 ND_PRINT((ndo, "\n\t\t Error Metric: %d, %s", 1692 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error), 1693 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal")); 1694 1695 return(1); /* everything is ok */ 1696 } 1697 1698 static int 1699 isis_print_tlv_ip_reach(netdissect_options *ndo, 1700 const uint8_t *cp, const char *ident, int length) 1701 { 1702 int prefix_len; 1703 const struct isis_tlv_ip_reach *tlv_ip_reach; 1704 1705 tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp; 1706 1707 while (length > 0) { 1708 if ((size_t)length < sizeof(*tlv_ip_reach)) { 1709 ND_PRINT((ndo, "short IPv4 Reachability (%d vs %lu)", 1710 length, 1711 (unsigned long)sizeof(*tlv_ip_reach))); 1712 return (0); 1713 } 1714 1715 if (!ND_TTEST(*tlv_ip_reach)) 1716 return (0); 1717 1718 prefix_len = mask2plen(EXTRACT_32BITS(tlv_ip_reach->mask)); 1719 1720 if (prefix_len == -1) 1721 ND_PRINT((ndo, "%sIPv4 prefix: %s mask %s", 1722 ident, 1723 ipaddr_string(ndo, (tlv_ip_reach->prefix)), 1724 ipaddr_string(ndo, (tlv_ip_reach->mask)))); 1725 else 1726 ND_PRINT((ndo, "%sIPv4 prefix: %15s/%u", 1727 ident, 1728 ipaddr_string(ndo, (tlv_ip_reach->prefix)), 1729 prefix_len)); 1730 1731 ND_PRINT((ndo, ", Distribution: %s, Metric: %u, %s", 1732 ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up", 1733 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default), 1734 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal")); 1735 1736 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay)) 1737 ND_PRINT((ndo, "%s Delay Metric: %u, %s", 1738 ident, 1739 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay), 1740 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal")); 1741 1742 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense)) 1743 ND_PRINT((ndo, "%s Expense Metric: %u, %s", 1744 ident, 1745 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense), 1746 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal")); 1747 1748 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error)) 1749 ND_PRINT((ndo, "%s Error Metric: %u, %s", 1750 ident, 1751 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error), 1752 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal")); 1753 1754 length -= sizeof(struct isis_tlv_ip_reach); 1755 tlv_ip_reach++; 1756 } 1757 return (1); 1758 } 1759 1760 /* 1761 * this is the common IP-REACH subTLV decoder it is called 1762 * from various EXTD-IP REACH TLVs (135,235,236,237) 1763 */ 1764 1765 static int 1766 isis_print_ip_reach_subtlv(netdissect_options *ndo, 1767 const uint8_t *tptr, int subt, int subl, 1768 const char *ident) 1769 { 1770 /* first lets see if we know the subTLVs name*/ 1771 ND_PRINT((ndo, "%s%s subTLV #%u, length: %u", 1772 ident, tok2str(isis_ext_ip_reach_subtlv_values, "unknown", subt), 1773 subt, subl)); 1774 1775 ND_TCHECK2(*tptr,subl); 1776 1777 switch(subt) { 1778 case ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR: /* fall through */ 1779 case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32: 1780 while (subl >= 4) { 1781 ND_PRINT((ndo, ", 0x%08x (=%u)", 1782 EXTRACT_32BITS(tptr), 1783 EXTRACT_32BITS(tptr))); 1784 tptr+=4; 1785 subl-=4; 1786 } 1787 break; 1788 case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64: 1789 while (subl >= 8) { 1790 ND_PRINT((ndo, ", 0x%08x%08x", 1791 EXTRACT_32BITS(tptr), 1792 EXTRACT_32BITS(tptr+4))); 1793 tptr+=8; 1794 subl-=8; 1795 } 1796 break; 1797 default: 1798 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl)) 1799 return(0); 1800 break; 1801 } 1802 return(1); 1803 1804 trunc: 1805 ND_PRINT((ndo, "%s", ident)); 1806 ND_PRINT((ndo, "%s", tstr)); 1807 return(0); 1808 } 1809 1810 /* 1811 * this is the common IS-REACH subTLV decoder it is called 1812 * from isis_print_ext_is_reach() 1813 */ 1814 1815 static int 1816 isis_print_is_reach_subtlv(netdissect_options *ndo, 1817 const uint8_t *tptr, u_int subt, u_int subl, 1818 const char *ident) 1819 { 1820 u_int te_class,priority_level,gmpls_switch_cap; 1821 union { /* int to float conversion buffer for several subTLVs */ 1822 float f; 1823 uint32_t i; 1824 } bw; 1825 1826 /* first lets see if we know the subTLVs name*/ 1827 ND_PRINT((ndo, "%s%s subTLV #%u, length: %u", 1828 ident, tok2str(isis_ext_is_reach_subtlv_values, "unknown", subt), 1829 subt, subl)); 1830 1831 ND_TCHECK2(*tptr, subl); 1832 1833 switch(subt) { 1834 case ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP: 1835 case ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID: 1836 case ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID: 1837 if (subl >= 4) { 1838 ND_PRINT((ndo, ", 0x%08x", EXTRACT_32BITS(tptr))); 1839 if (subl == 8) /* rfc4205 */ 1840 ND_PRINT((ndo, ", 0x%08x", EXTRACT_32BITS(tptr+4))); 1841 } 1842 break; 1843 case ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR: 1844 case ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR: 1845 if (subl >= sizeof(struct in_addr)) 1846 ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr))); 1847 break; 1848 case ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW : 1849 case ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW: 1850 if (subl >= 4) { 1851 bw.i = EXTRACT_32BITS(tptr); 1852 ND_PRINT((ndo, ", %.3f Mbps", bw.f * 8 / 1000000)); 1853 } 1854 break; 1855 case ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW : 1856 if (subl >= 32) { 1857 for (te_class = 0; te_class < 8; te_class++) { 1858 bw.i = EXTRACT_32BITS(tptr); 1859 ND_PRINT((ndo, "%s TE-Class %u: %.3f Mbps", 1860 ident, 1861 te_class, 1862 bw.f * 8 / 1000000)); 1863 tptr+=4; 1864 } 1865 } 1866 break; 1867 case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS: /* fall through */ 1868 case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD: 1869 if (subl == 0) 1870 break; 1871 ND_PRINT((ndo, "%sBandwidth Constraints Model ID: %s (%u)", 1872 ident, 1873 tok2str(diffserv_te_bc_values, "unknown", *tptr), 1874 *tptr)); 1875 tptr++; 1876 /* decode BCs until the subTLV ends */ 1877 for (te_class = 0; te_class < (subl-1)/4; te_class++) { 1878 bw.i = EXTRACT_32BITS(tptr); 1879 ND_PRINT((ndo, "%s Bandwidth constraint CT%u: %.3f Mbps", 1880 ident, 1881 te_class, 1882 bw.f * 8 / 1000000)); 1883 tptr+=4; 1884 } 1885 break; 1886 case ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC: 1887 if (subl >= 3) 1888 ND_PRINT((ndo, ", %u", EXTRACT_24BITS(tptr))); 1889 break; 1890 case ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE: 1891 if (subl == 2) { 1892 ND_PRINT((ndo, ", [ %s ] (0x%04x)", 1893 bittok2str(isis_subtlv_link_attribute_values, 1894 "Unknown", 1895 EXTRACT_16BITS(tptr)), 1896 EXTRACT_16BITS(tptr))); 1897 } 1898 break; 1899 case ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE: 1900 if (subl >= 2) { 1901 ND_PRINT((ndo, ", %s, Priority %u", 1902 bittok2str(gmpls_link_prot_values, "none", *tptr), 1903 *(tptr+1))); 1904 } 1905 break; 1906 case ISIS_SUBTLV_SPB_METRIC: 1907 if (subl >= 6) { 1908 ND_PRINT((ndo, ", LM: %u", EXTRACT_24BITS(tptr))); 1909 tptr=tptr+3; 1910 ND_PRINT((ndo, ", P: %u", *(tptr))); 1911 tptr++; 1912 ND_PRINT((ndo, ", P-ID: %u", EXTRACT_16BITS(tptr))); 1913 } 1914 break; 1915 case ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR: 1916 if (subl >= 36) { 1917 gmpls_switch_cap = *tptr; 1918 ND_PRINT((ndo, "%s Interface Switching Capability:%s", 1919 ident, 1920 tok2str(gmpls_switch_cap_values, "Unknown", gmpls_switch_cap))); 1921 ND_PRINT((ndo, ", LSP Encoding: %s", 1922 tok2str(gmpls_encoding_values, "Unknown", *(tptr + 1)))); 1923 tptr+=4; 1924 ND_PRINT((ndo, "%s Max LSP Bandwidth:", ident)); 1925 for (priority_level = 0; priority_level < 8; priority_level++) { 1926 bw.i = EXTRACT_32BITS(tptr); 1927 ND_PRINT((ndo, "%s priority level %d: %.3f Mbps", 1928 ident, 1929 priority_level, 1930 bw.f * 8 / 1000000)); 1931 tptr+=4; 1932 } 1933 subl-=36; 1934 switch (gmpls_switch_cap) { 1935 case GMPLS_PSC1: 1936 case GMPLS_PSC2: 1937 case GMPLS_PSC3: 1938 case GMPLS_PSC4: 1939 if (subl < 6) 1940 break; 1941 bw.i = EXTRACT_32BITS(tptr); 1942 ND_PRINT((ndo, "%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f * 8 / 1000000)); 1943 ND_PRINT((ndo, "%s Interface MTU: %u", ident, EXTRACT_16BITS(tptr + 4))); 1944 break; 1945 case GMPLS_TSC: 1946 if (subl < 8) 1947 break; 1948 bw.i = EXTRACT_32BITS(tptr); 1949 ND_PRINT((ndo, "%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f * 8 / 1000000)); 1950 ND_PRINT((ndo, "%s Indication %s", ident, 1951 tok2str(gmpls_switch_cap_tsc_indication_values, "Unknown (%u)", *(tptr + 4)))); 1952 break; 1953 default: 1954 /* there is some optional stuff left to decode but this is as of yet 1955 not specified so just lets hexdump what is left */ 1956 if(subl>0){ 1957 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl)) 1958 return(0); 1959 } 1960 } 1961 } 1962 break; 1963 default: 1964 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl)) 1965 return(0); 1966 break; 1967 } 1968 return(1); 1969 1970 trunc: 1971 return(0); 1972 } 1973 1974 /* 1975 * this is the common IS-REACH decoder it is called 1976 * from various EXTD-IS REACH style TLVs (22,24,222) 1977 */ 1978 1979 static int 1980 isis_print_ext_is_reach(netdissect_options *ndo, 1981 const uint8_t *tptr, const char *ident, int tlv_type) 1982 { 1983 char ident_buffer[20]; 1984 int subtlv_type,subtlv_len,subtlv_sum_len; 1985 int proc_bytes = 0; /* how many bytes did we process ? */ 1986 1987 if (!ND_TTEST2(*tptr, NODE_ID_LEN)) 1988 return(0); 1989 1990 ND_PRINT((ndo, "%sIS Neighbor: %s", ident, isis_print_id(tptr, NODE_ID_LEN))); 1991 tptr+=(NODE_ID_LEN); 1992 1993 if (tlv_type != ISIS_TLV_IS_ALIAS_ID) { /* the Alias TLV Metric field is implicit 0 */ 1994 if (!ND_TTEST2(*tptr, 3)) /* and is therefore skipped */ 1995 return(0); 1996 ND_PRINT((ndo, ", Metric: %d", EXTRACT_24BITS(tptr))); 1997 tptr+=3; 1998 } 1999 2000 if (!ND_TTEST2(*tptr, 1)) 2001 return(0); 2002 subtlv_sum_len=*(tptr++); /* read out subTLV length */ 2003 proc_bytes=NODE_ID_LEN+3+1; 2004 ND_PRINT((ndo, ", %ssub-TLVs present",subtlv_sum_len ? "" : "no ")); 2005 if (subtlv_sum_len) { 2006 ND_PRINT((ndo, " (%u)", subtlv_sum_len)); 2007 while (subtlv_sum_len>0) { 2008 if (!ND_TTEST2(*tptr,2)) 2009 return(0); 2010 subtlv_type=*(tptr++); 2011 subtlv_len=*(tptr++); 2012 /* prepend the indent string */ 2013 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident); 2014 if (!isis_print_is_reach_subtlv(ndo, tptr, subtlv_type, subtlv_len, ident_buffer)) 2015 return(0); 2016 tptr+=subtlv_len; 2017 subtlv_sum_len-=(subtlv_len+2); 2018 proc_bytes+=(subtlv_len+2); 2019 } 2020 } 2021 return(proc_bytes); 2022 } 2023 2024 /* 2025 * this is the common Multi Topology ID decoder 2026 * it is called from various MT-TLVs (222,229,235,237) 2027 */ 2028 2029 static int 2030 isis_print_mtid(netdissect_options *ndo, 2031 const uint8_t *tptr, const char *ident) 2032 { 2033 if (!ND_TTEST2(*tptr, 2)) 2034 return(0); 2035 2036 ND_PRINT((ndo, "%s%s", 2037 ident, 2038 tok2str(isis_mt_values, 2039 "Reserved for IETF Consensus", 2040 ISIS_MASK_MTID(EXTRACT_16BITS(tptr))))); 2041 2042 ND_PRINT((ndo, " Topology (0x%03x), Flags: [%s]", 2043 ISIS_MASK_MTID(EXTRACT_16BITS(tptr)), 2044 bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(EXTRACT_16BITS(tptr))))); 2045 2046 return(2); 2047 } 2048 2049 /* 2050 * this is the common extended IP reach decoder 2051 * it is called from TLVs (135,235,236,237) 2052 * we process the TLV and optional subTLVs and return 2053 * the amount of processed bytes 2054 */ 2055 2056 static int 2057 isis_print_extd_ip_reach(netdissect_options *ndo, 2058 const uint8_t *tptr, const char *ident, uint16_t afi) 2059 { 2060 char ident_buffer[20]; 2061 uint8_t prefix[sizeof(struct in6_addr)]; /* shared copy buffer for IPv4 and IPv6 prefixes */ 2062 u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen; 2063 2064 if (!ND_TTEST2(*tptr, 4)) 2065 return (0); 2066 metric = EXTRACT_32BITS(tptr); 2067 processed=4; 2068 tptr+=4; 2069 2070 if (afi == AF_INET) { 2071 if (!ND_TTEST2(*tptr, 1)) /* fetch status byte */ 2072 return (0); 2073 status_byte=*(tptr++); 2074 bit_length = status_byte&0x3f; 2075 if (bit_length > 32) { 2076 ND_PRINT((ndo, "%sIPv4 prefix: bad bit length %u", 2077 ident, 2078 bit_length)); 2079 return (0); 2080 } 2081 processed++; 2082 } else if (afi == AF_INET6) { 2083 if (!ND_TTEST2(*tptr, 2)) /* fetch status & prefix_len byte */ 2084 return (0); 2085 status_byte=*(tptr++); 2086 bit_length=*(tptr++); 2087 if (bit_length > 128) { 2088 ND_PRINT((ndo, "%sIPv6 prefix: bad bit length %u", 2089 ident, 2090 bit_length)); 2091 return (0); 2092 } 2093 processed+=2; 2094 } else 2095 return (0); /* somebody is fooling us */ 2096 2097 byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */ 2098 2099 if (!ND_TTEST2(*tptr, byte_length)) 2100 return (0); 2101 memset(prefix, 0, sizeof prefix); /* clear the copy buffer */ 2102 memcpy(prefix,tptr,byte_length); /* copy as much as is stored in the TLV */ 2103 tptr+=byte_length; 2104 processed+=byte_length; 2105 2106 if (afi == AF_INET) 2107 ND_PRINT((ndo, "%sIPv4 prefix: %15s/%u", 2108 ident, 2109 ipaddr_string(ndo, prefix), 2110 bit_length)); 2111 else if (afi == AF_INET6) 2112 ND_PRINT((ndo, "%sIPv6 prefix: %s/%u", 2113 ident, 2114 ip6addr_string(ndo, prefix), 2115 bit_length)); 2116 2117 ND_PRINT((ndo, ", Distribution: %s, Metric: %u", 2118 ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up", 2119 metric)); 2120 2121 if (afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)) 2122 ND_PRINT((ndo, ", sub-TLVs present")); 2123 else if (afi == AF_INET6) 2124 ND_PRINT((ndo, ", %s%s", 2125 ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal", 2126 ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : "")); 2127 2128 if ((afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)) 2129 || (afi == AF_INET6 && ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte)) 2130 ) { 2131 /* assume that one prefix can hold more 2132 than one subTLV - therefore the first byte must reflect 2133 the aggregate bytecount of the subTLVs for this prefix 2134 */ 2135 if (!ND_TTEST2(*tptr, 1)) 2136 return (0); 2137 sublen=*(tptr++); 2138 processed+=sublen+1; 2139 ND_PRINT((ndo, " (%u)", sublen)); /* print out subTLV length */ 2140 2141 while (sublen>0) { 2142 if (!ND_TTEST2(*tptr,2)) 2143 return (0); 2144 subtlvtype=*(tptr++); 2145 subtlvlen=*(tptr++); 2146 /* prepend the indent string */ 2147 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident); 2148 if (!isis_print_ip_reach_subtlv(ndo, tptr, subtlvtype, subtlvlen, ident_buffer)) 2149 return(0); 2150 tptr+=subtlvlen; 2151 sublen-=(subtlvlen+2); 2152 } 2153 } 2154 return (processed); 2155 } 2156 2157 /* 2158 * Clear checksum and lifetime prior to signature verification. 2159 */ 2160 static void 2161 isis_clear_checksum_lifetime(void *header) 2162 { 2163 struct isis_lsp_header *header_lsp = (struct isis_lsp_header *) header; 2164 2165 header_lsp->checksum[0] = 0; 2166 header_lsp->checksum[1] = 0; 2167 header_lsp->remaining_lifetime[0] = 0; 2168 header_lsp->remaining_lifetime[1] = 0; 2169 } 2170 2171 /* 2172 * isis_print 2173 * Decode IS-IS packets. Return 0 on error. 2174 */ 2175 2176 static int 2177 isis_print(netdissect_options *ndo, 2178 const uint8_t *p, u_int length) 2179 { 2180 const struct isis_common_header *isis_header; 2181 2182 const struct isis_iih_lan_header *header_iih_lan; 2183 const struct isis_iih_ptp_header *header_iih_ptp; 2184 const struct isis_lsp_header *header_lsp; 2185 const struct isis_csnp_header *header_csnp; 2186 const struct isis_psnp_header *header_psnp; 2187 2188 const struct isis_tlv_lsp *tlv_lsp; 2189 const struct isis_tlv_ptp_adj *tlv_ptp_adj; 2190 const struct isis_tlv_is_reach *tlv_is_reach; 2191 const struct isis_tlv_es_reach *tlv_es_reach; 2192 2193 uint8_t pdu_type, max_area, id_length, tlv_type, tlv_len, tmp, alen, lan_alen, prefix_len; 2194 uint8_t ext_is_len, ext_ip_len, mt_len; 2195 const uint8_t *optr, *pptr, *tptr; 2196 u_short packet_len,pdu_len, key_id; 2197 u_int i,vendor_id; 2198 int sigcheck; 2199 2200 packet_len=length; 2201 optr = p; /* initialize the _o_riginal pointer to the packet start - 2202 need it for parsing the checksum TLV and authentication 2203 TLV verification */ 2204 isis_header = (const struct isis_common_header *)p; 2205 ND_TCHECK(*isis_header); 2206 if (length < ISIS_COMMON_HEADER_SIZE) 2207 goto trunc; 2208 pptr = p+(ISIS_COMMON_HEADER_SIZE); 2209 header_iih_lan = (const struct isis_iih_lan_header *)pptr; 2210 header_iih_ptp = (const struct isis_iih_ptp_header *)pptr; 2211 header_lsp = (const struct isis_lsp_header *)pptr; 2212 header_csnp = (const struct isis_csnp_header *)pptr; 2213 header_psnp = (const struct isis_psnp_header *)pptr; 2214 2215 if (!ndo->ndo_eflag) 2216 ND_PRINT((ndo, "IS-IS")); 2217 2218 /* 2219 * Sanity checking of the header. 2220 */ 2221 2222 if (isis_header->version != ISIS_VERSION) { 2223 ND_PRINT((ndo, "version %d packet not supported", isis_header->version)); 2224 return (0); 2225 } 2226 2227 if ((isis_header->id_length != SYSTEM_ID_LEN) && (isis_header->id_length != 0)) { 2228 ND_PRINT((ndo, "system ID length of %d is not supported", 2229 isis_header->id_length)); 2230 return (0); 2231 } 2232 2233 if (isis_header->pdu_version != ISIS_VERSION) { 2234 ND_PRINT((ndo, "version %d packet not supported", isis_header->pdu_version)); 2235 return (0); 2236 } 2237 2238 if (length < isis_header->fixed_len) { 2239 ND_PRINT((ndo, "fixed header length %u > packet length %u", isis_header->fixed_len, length)); 2240 return (0); 2241 } 2242 2243 if (isis_header->fixed_len < ISIS_COMMON_HEADER_SIZE) { 2244 ND_PRINT((ndo, "fixed header length %u < minimum header size %u", isis_header->fixed_len, (u_int)ISIS_COMMON_HEADER_SIZE)); 2245 return (0); 2246 } 2247 2248 max_area = isis_header->max_area; 2249 switch(max_area) { 2250 case 0: 2251 max_area = 3; /* silly shit */ 2252 break; 2253 case 255: 2254 ND_PRINT((ndo, "bad packet -- 255 areas")); 2255 return (0); 2256 default: 2257 break; 2258 } 2259 2260 id_length = isis_header->id_length; 2261 switch(id_length) { 2262 case 0: 2263 id_length = 6; /* silly shit again */ 2264 break; 2265 case 1: /* 1-8 are valid sys-ID lenghts */ 2266 case 2: 2267 case 3: 2268 case 4: 2269 case 5: 2270 case 6: 2271 case 7: 2272 case 8: 2273 break; 2274 case 255: 2275 id_length = 0; /* entirely useless */ 2276 break; 2277 default: 2278 break; 2279 } 2280 2281 /* toss any non 6-byte sys-ID len PDUs */ 2282 if (id_length != 6 ) { 2283 ND_PRINT((ndo, "bad packet -- illegal sys-ID length (%u)", id_length)); 2284 return (0); 2285 } 2286 2287 pdu_type=isis_header->pdu_type; 2288 2289 /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/ 2290 if (ndo->ndo_vflag == 0) { 2291 ND_PRINT((ndo, "%s%s", 2292 ndo->ndo_eflag ? "" : ", ", 2293 tok2str(isis_pdu_values, "unknown PDU-Type %u", pdu_type))); 2294 } else { 2295 /* ok they seem to want to know everything - lets fully decode it */ 2296 ND_PRINT((ndo, "%slength %u", ndo->ndo_eflag ? "" : ", ", length)); 2297 2298 ND_PRINT((ndo, "\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)", 2299 tok2str(isis_pdu_values, 2300 "unknown, type %u", 2301 pdu_type), 2302 isis_header->fixed_len, 2303 isis_header->version, 2304 isis_header->pdu_version, 2305 id_length, 2306 isis_header->id_length, 2307 max_area, 2308 isis_header->max_area)); 2309 2310 if (ndo->ndo_vflag > 1) { 2311 if (!print_unknown_data(ndo, optr, "\n\t", 8)) /* provide the _o_riginal pointer */ 2312 return (0); /* for optionally debugging the common header */ 2313 } 2314 } 2315 2316 switch (pdu_type) { 2317 2318 case ISIS_PDU_L1_LAN_IIH: 2319 case ISIS_PDU_L2_LAN_IIH: 2320 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) { 2321 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", 2322 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE))); 2323 return (0); 2324 } 2325 ND_TCHECK(*header_iih_lan); 2326 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE) 2327 goto trunc; 2328 if (ndo->ndo_vflag == 0) { 2329 ND_PRINT((ndo, ", src-id %s", 2330 isis_print_id(header_iih_lan->source_id, SYSTEM_ID_LEN))); 2331 ND_PRINT((ndo, ", lan-id %s, prio %u", 2332 isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN), 2333 header_iih_lan->priority)); 2334 ND_PRINT((ndo, ", length %u", length)); 2335 return (1); 2336 } 2337 pdu_len=EXTRACT_16BITS(header_iih_lan->pdu_len); 2338 if (packet_len>pdu_len) { 2339 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ 2340 length=pdu_len; 2341 } 2342 2343 ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]", 2344 isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN), 2345 EXTRACT_16BITS(header_iih_lan->holding_time), 2346 tok2str(isis_iih_circuit_type_values, 2347 "unknown circuit type 0x%02x", 2348 header_iih_lan->circuit_type))); 2349 2350 ND_PRINT((ndo, "\n\t lan-id: %s, Priority: %u, PDU length: %u", 2351 isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN), 2352 (header_iih_lan->priority) & ISIS_LAN_PRIORITY_MASK, 2353 pdu_len)); 2354 2355 if (ndo->ndo_vflag > 1) { 2356 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_LAN_HEADER_SIZE)) 2357 return (0); 2358 } 2359 2360 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE); 2361 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE); 2362 break; 2363 2364 case ISIS_PDU_PTP_IIH: 2365 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) { 2366 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", 2367 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE))); 2368 return (0); 2369 } 2370 ND_TCHECK(*header_iih_ptp); 2371 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE) 2372 goto trunc; 2373 if (ndo->ndo_vflag == 0) { 2374 ND_PRINT((ndo, ", src-id %s", isis_print_id(header_iih_ptp->source_id, SYSTEM_ID_LEN))); 2375 ND_PRINT((ndo, ", length %u", length)); 2376 return (1); 2377 } 2378 pdu_len=EXTRACT_16BITS(header_iih_ptp->pdu_len); 2379 if (packet_len>pdu_len) { 2380 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ 2381 length=pdu_len; 2382 } 2383 2384 ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]", 2385 isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN), 2386 EXTRACT_16BITS(header_iih_ptp->holding_time), 2387 tok2str(isis_iih_circuit_type_values, 2388 "unknown circuit type 0x%02x", 2389 header_iih_ptp->circuit_type))); 2390 2391 ND_PRINT((ndo, "\n\t circuit-id: 0x%02x, PDU length: %u", 2392 header_iih_ptp->circuit_id, 2393 pdu_len)); 2394 2395 if (ndo->ndo_vflag > 1) { 2396 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_PTP_HEADER_SIZE)) 2397 return (0); 2398 } 2399 2400 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE); 2401 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE); 2402 break; 2403 2404 case ISIS_PDU_L1_LSP: 2405 case ISIS_PDU_L2_LSP: 2406 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) { 2407 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", 2408 isis_header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE)); 2409 return (0); 2410 } 2411 ND_TCHECK(*header_lsp); 2412 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE) 2413 goto trunc; 2414 if (ndo->ndo_vflag == 0) { 2415 ND_PRINT((ndo, ", lsp-id %s, seq 0x%08x, lifetime %5us", 2416 isis_print_id(header_lsp->lsp_id, LSP_ID_LEN), 2417 EXTRACT_32BITS(header_lsp->sequence_number), 2418 EXTRACT_16BITS(header_lsp->remaining_lifetime))); 2419 ND_PRINT((ndo, ", length %u", length)); 2420 return (1); 2421 } 2422 pdu_len=EXTRACT_16BITS(header_lsp->pdu_len); 2423 if (packet_len>pdu_len) { 2424 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ 2425 length=pdu_len; 2426 } 2427 2428 ND_PRINT((ndo, "\n\t lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t chksum: 0x%04x", 2429 isis_print_id(header_lsp->lsp_id, LSP_ID_LEN), 2430 EXTRACT_32BITS(header_lsp->sequence_number), 2431 EXTRACT_16BITS(header_lsp->remaining_lifetime), 2432 EXTRACT_16BITS(header_lsp->checksum))); 2433 2434 osi_print_cksum(ndo, (const uint8_t *)header_lsp->lsp_id, 2435 EXTRACT_16BITS(header_lsp->checksum), 2436 12, length-12); 2437 2438 ND_PRINT((ndo, ", PDU length: %u, Flags: [ %s", 2439 pdu_len, 2440 ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : "")); 2441 2442 if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) { 2443 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : "")); 2444 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : "")); 2445 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : "")); 2446 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : "")); 2447 ND_PRINT((ndo, "ATT bit set, ")); 2448 } 2449 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : "")); 2450 ND_PRINT((ndo, "%s ]", tok2str(isis_lsp_istype_values, "Unknown(0x%x)", 2451 ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)))); 2452 2453 if (ndo->ndo_vflag > 1) { 2454 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_LSP_HEADER_SIZE)) 2455 return (0); 2456 } 2457 2458 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE); 2459 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE); 2460 break; 2461 2462 case ISIS_PDU_L1_CSNP: 2463 case ISIS_PDU_L2_CSNP: 2464 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) { 2465 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu", 2466 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE))); 2467 return (0); 2468 } 2469 ND_TCHECK(*header_csnp); 2470 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE) 2471 goto trunc; 2472 if (ndo->ndo_vflag == 0) { 2473 ND_PRINT((ndo, ", src-id %s", isis_print_id(header_csnp->source_id, NODE_ID_LEN))); 2474 ND_PRINT((ndo, ", length %u", length)); 2475 return (1); 2476 } 2477 pdu_len=EXTRACT_16BITS(header_csnp->pdu_len); 2478 if (packet_len>pdu_len) { 2479 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ 2480 length=pdu_len; 2481 } 2482 2483 ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u", 2484 isis_print_id(header_csnp->source_id, NODE_ID_LEN), 2485 pdu_len)); 2486 ND_PRINT((ndo, "\n\t start lsp-id: %s", 2487 isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN))); 2488 ND_PRINT((ndo, "\n\t end lsp-id: %s", 2489 isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN))); 2490 2491 if (ndo->ndo_vflag > 1) { 2492 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_CSNP_HEADER_SIZE)) 2493 return (0); 2494 } 2495 2496 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE); 2497 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE); 2498 break; 2499 2500 case ISIS_PDU_L1_PSNP: 2501 case ISIS_PDU_L2_PSNP: 2502 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) { 2503 ND_PRINT((ndo, "- bogus fixed header length %u should be %lu", 2504 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE))); 2505 return (0); 2506 } 2507 ND_TCHECK(*header_psnp); 2508 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE) 2509 goto trunc; 2510 if (ndo->ndo_vflag == 0) { 2511 ND_PRINT((ndo, ", src-id %s", isis_print_id(header_psnp->source_id, NODE_ID_LEN))); 2512 ND_PRINT((ndo, ", length %u", length)); 2513 return (1); 2514 } 2515 pdu_len=EXTRACT_16BITS(header_psnp->pdu_len); 2516 if (packet_len>pdu_len) { 2517 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */ 2518 length=pdu_len; 2519 } 2520 2521 ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u", 2522 isis_print_id(header_psnp->source_id, NODE_ID_LEN), 2523 pdu_len)); 2524 2525 if (ndo->ndo_vflag > 1) { 2526 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_PSNP_HEADER_SIZE)) 2527 return (0); 2528 } 2529 2530 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE); 2531 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE); 2532 break; 2533 2534 default: 2535 if (ndo->ndo_vflag == 0) { 2536 ND_PRINT((ndo, ", length %u", length)); 2537 return (1); 2538 } 2539 (void)print_unknown_data(ndo, pptr, "\n\t ", length); 2540 return (0); 2541 } 2542 2543 /* 2544 * Now print the TLV's. 2545 */ 2546 2547 while (packet_len > 0) { 2548 ND_TCHECK2(*pptr, 2); 2549 if (packet_len < 2) 2550 goto trunc; 2551 tlv_type = *pptr++; 2552 tlv_len = *pptr++; 2553 tmp =tlv_len; /* copy temporary len & pointer to packet data */ 2554 tptr = pptr; 2555 packet_len -= 2; 2556 2557 /* first lets see if we know the TLVs name*/ 2558 ND_PRINT((ndo, "\n\t %s TLV #%u, length: %u", 2559 tok2str(isis_tlv_values, 2560 "unknown", 2561 tlv_type), 2562 tlv_type, 2563 tlv_len)); 2564 2565 if (tlv_len == 0) /* something is invalid */ 2566 continue; 2567 2568 if (packet_len < tlv_len) 2569 goto trunc; 2570 2571 /* now check if we have a decoder otherwise do a hexdump at the end*/ 2572 switch (tlv_type) { 2573 case ISIS_TLV_AREA_ADDR: 2574 ND_TCHECK2(*tptr, 1); 2575 alen = *tptr++; 2576 while (tmp && alen < tmp) { 2577 ND_TCHECK2(*tptr, alen); 2578 ND_PRINT((ndo, "\n\t Area address (length: %u): %s", 2579 alen, 2580 isonsap_string(ndo, tptr, alen))); 2581 tptr += alen; 2582 tmp -= alen + 1; 2583 if (tmp==0) /* if this is the last area address do not attemt a boundary check */ 2584 break; 2585 ND_TCHECK2(*tptr, 1); 2586 alen = *tptr++; 2587 } 2588 break; 2589 case ISIS_TLV_ISNEIGH: 2590 while (tmp >= ETHER_ADDR_LEN) { 2591 ND_TCHECK2(*tptr, ETHER_ADDR_LEN); 2592 ND_PRINT((ndo, "\n\t SNPA: %s", isis_print_id(tptr, ETHER_ADDR_LEN))); 2593 tmp -= ETHER_ADDR_LEN; 2594 tptr += ETHER_ADDR_LEN; 2595 } 2596 break; 2597 2598 case ISIS_TLV_ISNEIGH_VARLEN: 2599 if (!ND_TTEST2(*tptr, 1) || tmp < 3) /* min. TLV length */ 2600 goto trunctlv; 2601 lan_alen = *tptr++; /* LAN address length */ 2602 if (lan_alen == 0) { 2603 ND_PRINT((ndo, "\n\t LAN address length 0 bytes (invalid)")); 2604 break; 2605 } 2606 tmp --; 2607 ND_PRINT((ndo, "\n\t LAN address length %u bytes ", lan_alen)); 2608 while (tmp >= lan_alen) { 2609 ND_TCHECK2(*tptr, lan_alen); 2610 ND_PRINT((ndo, "\n\t\tIS Neighbor: %s", isis_print_id(tptr, lan_alen))); 2611 tmp -= lan_alen; 2612 tptr +=lan_alen; 2613 } 2614 break; 2615 2616 case ISIS_TLV_PADDING: 2617 break; 2618 2619 case ISIS_TLV_MT_IS_REACH: 2620 mt_len = isis_print_mtid(ndo, tptr, "\n\t "); 2621 if (mt_len == 0) /* did something go wrong ? */ 2622 goto trunctlv; 2623 tptr+=mt_len; 2624 tmp-=mt_len; 2625 while (tmp >= 2+NODE_ID_LEN+3+1) { 2626 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type); 2627 if (ext_is_len == 0) /* did something go wrong ? */ 2628 goto trunctlv; 2629 2630 tmp-=ext_is_len; 2631 tptr+=ext_is_len; 2632 } 2633 break; 2634 2635 case ISIS_TLV_IS_ALIAS_ID: 2636 while (tmp >= NODE_ID_LEN+1) { /* is it worth attempting a decode ? */ 2637 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type); 2638 if (ext_is_len == 0) /* did something go wrong ? */ 2639 goto trunctlv; 2640 tmp-=ext_is_len; 2641 tptr+=ext_is_len; 2642 } 2643 break; 2644 2645 case ISIS_TLV_EXT_IS_REACH: 2646 while (tmp >= NODE_ID_LEN+3+1) { /* is it worth attempting a decode ? */ 2647 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type); 2648 if (ext_is_len == 0) /* did something go wrong ? */ 2649 goto trunctlv; 2650 tmp-=ext_is_len; 2651 tptr+=ext_is_len; 2652 } 2653 break; 2654 case ISIS_TLV_IS_REACH: 2655 ND_TCHECK2(*tptr,1); /* check if there is one byte left to read out the virtual flag */ 2656 ND_PRINT((ndo, "\n\t %s", 2657 tok2str(isis_is_reach_virtual_values, 2658 "bogus virtual flag 0x%02x", 2659 *tptr++))); 2660 tlv_is_reach = (const struct isis_tlv_is_reach *)tptr; 2661 while (tmp >= sizeof(struct isis_tlv_is_reach)) { 2662 ND_TCHECK(*tlv_is_reach); 2663 ND_PRINT((ndo, "\n\t IS Neighbor: %s", 2664 isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN))); 2665 isis_print_metric_block(ndo, &tlv_is_reach->isis_metric_block); 2666 tmp -= sizeof(struct isis_tlv_is_reach); 2667 tlv_is_reach++; 2668 } 2669 break; 2670 2671 case ISIS_TLV_ESNEIGH: 2672 tlv_es_reach = (const struct isis_tlv_es_reach *)tptr; 2673 while (tmp >= sizeof(struct isis_tlv_es_reach)) { 2674 ND_TCHECK(*tlv_es_reach); 2675 ND_PRINT((ndo, "\n\t ES Neighbor: %s", 2676 isis_print_id(tlv_es_reach->neighbor_sysid, SYSTEM_ID_LEN))); 2677 isis_print_metric_block(ndo, &tlv_es_reach->isis_metric_block); 2678 tmp -= sizeof(struct isis_tlv_es_reach); 2679 tlv_es_reach++; 2680 } 2681 break; 2682 2683 /* those two TLVs share the same format */ 2684 case ISIS_TLV_INT_IP_REACH: 2685 case ISIS_TLV_EXT_IP_REACH: 2686 if (!isis_print_tlv_ip_reach(ndo, pptr, "\n\t ", tlv_len)) 2687 return (1); 2688 break; 2689 2690 case ISIS_TLV_EXTD_IP_REACH: 2691 while (tmp>0) { 2692 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET); 2693 if (ext_ip_len == 0) /* did something go wrong ? */ 2694 goto trunctlv; 2695 tptr+=ext_ip_len; 2696 tmp-=ext_ip_len; 2697 } 2698 break; 2699 2700 case ISIS_TLV_MT_IP_REACH: 2701 mt_len = isis_print_mtid(ndo, tptr, "\n\t "); 2702 if (mt_len == 0) { /* did something go wrong ? */ 2703 goto trunctlv; 2704 } 2705 tptr+=mt_len; 2706 tmp-=mt_len; 2707 2708 while (tmp>0) { 2709 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET); 2710 if (ext_ip_len == 0) /* did something go wrong ? */ 2711 goto trunctlv; 2712 tptr+=ext_ip_len; 2713 tmp-=ext_ip_len; 2714 } 2715 break; 2716 2717 case ISIS_TLV_IP6_REACH: 2718 while (tmp>0) { 2719 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET6); 2720 if (ext_ip_len == 0) /* did something go wrong ? */ 2721 goto trunctlv; 2722 tptr+=ext_ip_len; 2723 tmp-=ext_ip_len; 2724 } 2725 break; 2726 2727 case ISIS_TLV_MT_IP6_REACH: 2728 mt_len = isis_print_mtid(ndo, tptr, "\n\t "); 2729 if (mt_len == 0) { /* did something go wrong ? */ 2730 goto trunctlv; 2731 } 2732 tptr+=mt_len; 2733 tmp-=mt_len; 2734 2735 while (tmp>0) { 2736 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET6); 2737 if (ext_ip_len == 0) /* did something go wrong ? */ 2738 goto trunctlv; 2739 tptr+=ext_ip_len; 2740 tmp-=ext_ip_len; 2741 } 2742 break; 2743 2744 case ISIS_TLV_IP6ADDR: 2745 while (tmp>=sizeof(struct in6_addr)) { 2746 ND_TCHECK2(*tptr, sizeof(struct in6_addr)); 2747 2748 ND_PRINT((ndo, "\n\t IPv6 interface address: %s", 2749 ip6addr_string(ndo, tptr))); 2750 2751 tptr += sizeof(struct in6_addr); 2752 tmp -= sizeof(struct in6_addr); 2753 } 2754 break; 2755 case ISIS_TLV_AUTH: 2756 ND_TCHECK2(*tptr, 1); 2757 2758 ND_PRINT((ndo, "\n\t %s: ", 2759 tok2str(isis_subtlv_auth_values, 2760 "unknown Authentication type 0x%02x", 2761 *tptr))); 2762 2763 switch (*tptr) { 2764 case ISIS_SUBTLV_AUTH_SIMPLE: 2765 if (fn_printzp(ndo, tptr + 1, tlv_len - 1, ndo->ndo_snapend)) 2766 goto trunctlv; 2767 break; 2768 case ISIS_SUBTLV_AUTH_MD5: 2769 for(i=1;i<tlv_len;i++) { 2770 ND_TCHECK2(*(tptr + i), 1); 2771 ND_PRINT((ndo, "%02x", *(tptr + i))); 2772 } 2773 if (tlv_len != ISIS_SUBTLV_AUTH_MD5_LEN+1) 2774 ND_PRINT((ndo, ", (invalid subTLV) ")); 2775 2776 sigcheck = signature_verify(ndo, optr, length, tptr + 1, 2777 isis_clear_checksum_lifetime, 2778 header_lsp); 2779 ND_PRINT((ndo, " (%s)", tok2str(signature_check_values, "Unknown", sigcheck))); 2780 2781 break; 2782 case ISIS_SUBTLV_AUTH_GENERIC: 2783 ND_TCHECK2(*(tptr + 1), 2); 2784 key_id = EXTRACT_16BITS((tptr+1)); 2785 ND_PRINT((ndo, "%u, password: ", key_id)); 2786 for(i=1 + sizeof(uint16_t);i<tlv_len;i++) { 2787 ND_TCHECK2(*(tptr + i), 1); 2788 ND_PRINT((ndo, "%02x", *(tptr + i))); 2789 } 2790 break; 2791 case ISIS_SUBTLV_AUTH_PRIVATE: 2792 default: 2793 if (!print_unknown_data(ndo, tptr + 1, "\n\t\t ", tlv_len - 1)) 2794 return(0); 2795 break; 2796 } 2797 break; 2798 2799 case ISIS_TLV_PTP_ADJ: 2800 tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr; 2801 if(tmp>=1) { 2802 ND_TCHECK2(*tptr, 1); 2803 ND_PRINT((ndo, "\n\t Adjacency State: %s (%u)", 2804 tok2str(isis_ptp_adjancey_values, "unknown", *tptr), 2805 *tptr)); 2806 tmp--; 2807 } 2808 if(tmp>sizeof(tlv_ptp_adj->extd_local_circuit_id)) { 2809 ND_TCHECK(tlv_ptp_adj->extd_local_circuit_id); 2810 ND_PRINT((ndo, "\n\t Extended Local circuit-ID: 0x%08x", 2811 EXTRACT_32BITS(tlv_ptp_adj->extd_local_circuit_id))); 2812 tmp-=sizeof(tlv_ptp_adj->extd_local_circuit_id); 2813 } 2814 if(tmp>=SYSTEM_ID_LEN) { 2815 ND_TCHECK2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN); 2816 ND_PRINT((ndo, "\n\t Neighbor System-ID: %s", 2817 isis_print_id(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN))); 2818 tmp-=SYSTEM_ID_LEN; 2819 } 2820 if(tmp>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) { 2821 ND_TCHECK(tlv_ptp_adj->neighbor_extd_local_circuit_id); 2822 ND_PRINT((ndo, "\n\t Neighbor Extended Local circuit-ID: 0x%08x", 2823 EXTRACT_32BITS(tlv_ptp_adj->neighbor_extd_local_circuit_id))); 2824 } 2825 break; 2826 2827 case ISIS_TLV_PROTOCOLS: 2828 ND_PRINT((ndo, "\n\t NLPID(s): ")); 2829 while (tmp>0) { 2830 ND_TCHECK2(*(tptr), 1); 2831 ND_PRINT((ndo, "%s (0x%02x)", 2832 tok2str(nlpid_values, 2833 "unknown", 2834 *tptr), 2835 *tptr)); 2836 if (tmp>1) /* further NPLIDs ? - put comma */ 2837 ND_PRINT((ndo, ", ")); 2838 tptr++; 2839 tmp--; 2840 } 2841 break; 2842 2843 case ISIS_TLV_MT_PORT_CAP: 2844 { 2845 ND_TCHECK2(*(tptr), 2); 2846 2847 ND_PRINT((ndo, "\n\t RES: %d, MTID(s): %d", 2848 (EXTRACT_16BITS (tptr) >> 12), 2849 (EXTRACT_16BITS (tptr) & 0x0fff))); 2850 2851 tmp = tmp-2; 2852 tptr = tptr+2; 2853 2854 if (tmp) 2855 isis_print_mt_port_cap_subtlv(ndo, tptr, tmp); 2856 2857 break; 2858 } 2859 2860 case ISIS_TLV_MT_CAPABILITY: 2861 2862 ND_TCHECK2(*(tptr), 2); 2863 2864 ND_PRINT((ndo, "\n\t O: %d, RES: %d, MTID(s): %d", 2865 (EXTRACT_16BITS(tptr) >> 15) & 0x01, 2866 (EXTRACT_16BITS(tptr) >> 12) & 0x07, 2867 EXTRACT_16BITS(tptr) & 0x0fff)); 2868 2869 tmp = tmp-2; 2870 tptr = tptr+2; 2871 2872 if (tmp) 2873 isis_print_mt_capability_subtlv(ndo, tptr, tmp); 2874 2875 break; 2876 2877 case ISIS_TLV_TE_ROUTER_ID: 2878 ND_TCHECK2(*pptr, sizeof(struct in_addr)); 2879 ND_PRINT((ndo, "\n\t Traffic Engineering Router ID: %s", ipaddr_string(ndo, pptr))); 2880 break; 2881 2882 case ISIS_TLV_IPADDR: 2883 while (tmp>=sizeof(struct in_addr)) { 2884 ND_TCHECK2(*tptr, sizeof(struct in_addr)); 2885 ND_PRINT((ndo, "\n\t IPv4 interface address: %s", ipaddr_string(ndo, tptr))); 2886 tptr += sizeof(struct in_addr); 2887 tmp -= sizeof(struct in_addr); 2888 } 2889 break; 2890 2891 case ISIS_TLV_HOSTNAME: 2892 ND_PRINT((ndo, "\n\t Hostname: ")); 2893 if (fn_printzp(ndo, tptr, tmp, ndo->ndo_snapend)) 2894 goto trunctlv; 2895 break; 2896 2897 case ISIS_TLV_SHARED_RISK_GROUP: 2898 if (tmp < NODE_ID_LEN) 2899 break; 2900 ND_TCHECK2(*tptr, NODE_ID_LEN); 2901 ND_PRINT((ndo, "\n\t IS Neighbor: %s", isis_print_id(tptr, NODE_ID_LEN))); 2902 tptr+=(NODE_ID_LEN); 2903 tmp-=(NODE_ID_LEN); 2904 2905 if (tmp < 1) 2906 break; 2907 ND_TCHECK2(*tptr, 1); 2908 ND_PRINT((ndo, ", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered")); 2909 tmp--; 2910 2911 if (tmp < sizeof(struct in_addr)) 2912 break; 2913 ND_TCHECK2(*tptr, sizeof(struct in_addr)); 2914 ND_PRINT((ndo, "\n\t IPv4 interface address: %s", ipaddr_string(ndo, tptr))); 2915 tptr+=sizeof(struct in_addr); 2916 tmp-=sizeof(struct in_addr); 2917 2918 if (tmp < sizeof(struct in_addr)) 2919 break; 2920 ND_TCHECK2(*tptr, sizeof(struct in_addr)); 2921 ND_PRINT((ndo, "\n\t IPv4 neighbor address: %s", ipaddr_string(ndo, tptr))); 2922 tptr+=sizeof(struct in_addr); 2923 tmp-=sizeof(struct in_addr); 2924 2925 while (tmp>=4) { 2926 ND_TCHECK2(*tptr, 4); 2927 ND_PRINT((ndo, "\n\t Link-ID: 0x%08x", EXTRACT_32BITS(tptr))); 2928 tptr+=4; 2929 tmp-=4; 2930 } 2931 break; 2932 2933 case ISIS_TLV_LSP: 2934 tlv_lsp = (const struct isis_tlv_lsp *)tptr; 2935 while(tmp>=sizeof(struct isis_tlv_lsp)) { 2936 ND_TCHECK((tlv_lsp->lsp_id)[LSP_ID_LEN-1]); 2937 ND_PRINT((ndo, "\n\t lsp-id: %s", 2938 isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN))); 2939 ND_TCHECK2(tlv_lsp->sequence_number, 4); 2940 ND_PRINT((ndo, ", seq: 0x%08x", EXTRACT_32BITS(tlv_lsp->sequence_number))); 2941 ND_TCHECK2(tlv_lsp->remaining_lifetime, 2); 2942 ND_PRINT((ndo, ", lifetime: %5ds", EXTRACT_16BITS(tlv_lsp->remaining_lifetime))); 2943 ND_TCHECK2(tlv_lsp->checksum, 2); 2944 ND_PRINT((ndo, ", chksum: 0x%04x", EXTRACT_16BITS(tlv_lsp->checksum))); 2945 tmp-=sizeof(struct isis_tlv_lsp); 2946 tlv_lsp++; 2947 } 2948 break; 2949 2950 case ISIS_TLV_CHECKSUM: 2951 if (tmp < ISIS_TLV_CHECKSUM_MINLEN) 2952 break; 2953 ND_TCHECK2(*tptr, ISIS_TLV_CHECKSUM_MINLEN); 2954 ND_PRINT((ndo, "\n\t checksum: 0x%04x ", EXTRACT_16BITS(tptr))); 2955 /* do not attempt to verify the checksum if it is zero 2956 * most likely a HMAC-MD5 TLV is also present and 2957 * to avoid conflicts the checksum TLV is zeroed. 2958 * see rfc3358 for details 2959 */ 2960 osi_print_cksum(ndo, optr, EXTRACT_16BITS(tptr), tptr-optr, 2961 length); 2962 break; 2963 2964 case ISIS_TLV_POI: 2965 if (tlv_len >= SYSTEM_ID_LEN + 1) { 2966 ND_TCHECK2(*tptr, SYSTEM_ID_LEN + 1); 2967 ND_PRINT((ndo, "\n\t Purge Originator System-ID: %s", 2968 isis_print_id(tptr + 1, SYSTEM_ID_LEN))); 2969 } 2970 2971 if (tlv_len == 2 * SYSTEM_ID_LEN + 1) { 2972 ND_TCHECK2(*tptr, 2 * SYSTEM_ID_LEN + 1); 2973 ND_PRINT((ndo, "\n\t Received from System-ID: %s", 2974 isis_print_id(tptr + SYSTEM_ID_LEN + 1, SYSTEM_ID_LEN))); 2975 } 2976 break; 2977 2978 case ISIS_TLV_MT_SUPPORTED: 2979 if (tmp < ISIS_TLV_MT_SUPPORTED_MINLEN) 2980 break; 2981 while (tmp>1) { 2982 /* length can only be a multiple of 2, otherwise there is 2983 something broken -> so decode down until length is 1 */ 2984 if (tmp!=1) { 2985 mt_len = isis_print_mtid(ndo, tptr, "\n\t "); 2986 if (mt_len == 0) /* did something go wrong ? */ 2987 goto trunctlv; 2988 tptr+=mt_len; 2989 tmp-=mt_len; 2990 } else { 2991 ND_PRINT((ndo, "\n\t invalid MT-ID")); 2992 break; 2993 } 2994 } 2995 break; 2996 2997 case ISIS_TLV_RESTART_SIGNALING: 2998 /* first attempt to decode the flags */ 2999 if (tmp < ISIS_TLV_RESTART_SIGNALING_FLAGLEN) 3000 break; 3001 ND_TCHECK2(*tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN); 3002 ND_PRINT((ndo, "\n\t Flags [%s]", 3003 bittok2str(isis_restart_flag_values, "none", *tptr))); 3004 tptr+=ISIS_TLV_RESTART_SIGNALING_FLAGLEN; 3005 tmp-=ISIS_TLV_RESTART_SIGNALING_FLAGLEN; 3006 3007 /* is there anything other than the flags field? */ 3008 if (tmp == 0) 3009 break; 3010 3011 if (tmp < ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN) 3012 break; 3013 ND_TCHECK2(*tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN); 3014 3015 ND_PRINT((ndo, ", Remaining holding time %us", EXTRACT_16BITS(tptr))); 3016 tptr+=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN; 3017 tmp-=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN; 3018 3019 /* is there an additional sysid field present ?*/ 3020 if (tmp == SYSTEM_ID_LEN) { 3021 ND_TCHECK2(*tptr, SYSTEM_ID_LEN); 3022 ND_PRINT((ndo, ", for %s", isis_print_id(tptr,SYSTEM_ID_LEN))); 3023 } 3024 break; 3025 3026 case ISIS_TLV_IDRP_INFO: 3027 if (tmp < ISIS_TLV_IDRP_INFO_MINLEN) 3028 break; 3029 ND_TCHECK2(*tptr, ISIS_TLV_IDRP_INFO_MINLEN); 3030 ND_PRINT((ndo, "\n\t Inter-Domain Information Type: %s", 3031 tok2str(isis_subtlv_idrp_values, 3032 "Unknown (0x%02x)", 3033 *tptr))); 3034 switch (*tptr++) { 3035 case ISIS_SUBTLV_IDRP_ASN: 3036 ND_TCHECK2(*tptr, 2); /* fetch AS number */ 3037 ND_PRINT((ndo, "AS Number: %u", EXTRACT_16BITS(tptr))); 3038 break; 3039 case ISIS_SUBTLV_IDRP_LOCAL: 3040 case ISIS_SUBTLV_IDRP_RES: 3041 default: 3042 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_len - 1)) 3043 return(0); 3044 break; 3045 } 3046 break; 3047 3048 case ISIS_TLV_LSP_BUFFERSIZE: 3049 if (tmp < ISIS_TLV_LSP_BUFFERSIZE_MINLEN) 3050 break; 3051 ND_TCHECK2(*tptr, ISIS_TLV_LSP_BUFFERSIZE_MINLEN); 3052 ND_PRINT((ndo, "\n\t LSP Buffersize: %u", EXTRACT_16BITS(tptr))); 3053 break; 3054 3055 case ISIS_TLV_PART_DIS: 3056 while (tmp >= SYSTEM_ID_LEN) { 3057 ND_TCHECK2(*tptr, SYSTEM_ID_LEN); 3058 ND_PRINT((ndo, "\n\t %s", isis_print_id(tptr, SYSTEM_ID_LEN))); 3059 tptr+=SYSTEM_ID_LEN; 3060 tmp-=SYSTEM_ID_LEN; 3061 } 3062 break; 3063 3064 case ISIS_TLV_PREFIX_NEIGH: 3065 if (tmp < sizeof(struct isis_metric_block)) 3066 break; 3067 ND_TCHECK2(*tptr, sizeof(struct isis_metric_block)); 3068 ND_PRINT((ndo, "\n\t Metric Block")); 3069 isis_print_metric_block(ndo, (const struct isis_metric_block *)tptr); 3070 tptr+=sizeof(struct isis_metric_block); 3071 tmp-=sizeof(struct isis_metric_block); 3072 3073 while(tmp>0) { 3074 ND_TCHECK2(*tptr, 1); 3075 prefix_len=*tptr++; /* read out prefix length in semioctets*/ 3076 if (prefix_len < 2) { 3077 ND_PRINT((ndo, "\n\t\tAddress: prefix length %u < 2", prefix_len)); 3078 break; 3079 } 3080 tmp--; 3081 if (tmp < prefix_len/2) 3082 break; 3083 ND_TCHECK2(*tptr, prefix_len / 2); 3084 ND_PRINT((ndo, "\n\t\tAddress: %s/%u", 3085 isonsap_string(ndo, tptr, prefix_len / 2), prefix_len * 4)); 3086 tptr+=prefix_len/2; 3087 tmp-=prefix_len/2; 3088 } 3089 break; 3090 3091 case ISIS_TLV_IIH_SEQNR: 3092 if (tmp < ISIS_TLV_IIH_SEQNR_MINLEN) 3093 break; 3094 ND_TCHECK2(*tptr, ISIS_TLV_IIH_SEQNR_MINLEN); /* check if four bytes are on the wire */ 3095 ND_PRINT((ndo, "\n\t Sequence number: %u", EXTRACT_32BITS(tptr))); 3096 break; 3097 3098 case ISIS_TLV_VENDOR_PRIVATE: 3099 if (tmp < ISIS_TLV_VENDOR_PRIVATE_MINLEN) 3100 break; 3101 ND_TCHECK2(*tptr, ISIS_TLV_VENDOR_PRIVATE_MINLEN); /* check if enough byte for a full oui */ 3102 vendor_id = EXTRACT_24BITS(tptr); 3103 ND_PRINT((ndo, "\n\t Vendor: %s (%u)", 3104 tok2str(oui_values, "Unknown", vendor_id), 3105 vendor_id)); 3106 tptr+=3; 3107 tmp-=3; 3108 if (tmp > 0) /* hexdump the rest */ 3109 if (!print_unknown_data(ndo, tptr, "\n\t\t", tmp)) 3110 return(0); 3111 break; 3112 /* 3113 * FIXME those are the defined TLVs that lack a decoder 3114 * you are welcome to contribute code ;-) 3115 */ 3116 3117 case ISIS_TLV_DECNET_PHASE4: 3118 case ISIS_TLV_LUCENT_PRIVATE: 3119 case ISIS_TLV_IPAUTH: 3120 case ISIS_TLV_NORTEL_PRIVATE1: 3121 case ISIS_TLV_NORTEL_PRIVATE2: 3122 3123 default: 3124 if (ndo->ndo_vflag <= 1) { 3125 if (!print_unknown_data(ndo, pptr, "\n\t\t", tlv_len)) 3126 return(0); 3127 } 3128 break; 3129 } 3130 /* do we want to see an additionally hexdump ? */ 3131 if (ndo->ndo_vflag> 1) { 3132 if (!print_unknown_data(ndo, pptr, "\n\t ", tlv_len)) 3133 return(0); 3134 } 3135 3136 pptr += tlv_len; 3137 packet_len -= tlv_len; 3138 } 3139 3140 if (packet_len != 0) { 3141 ND_PRINT((ndo, "\n\t %u straggler bytes", packet_len)); 3142 } 3143 return (1); 3144 3145 trunc: 3146 ND_PRINT((ndo, "%s", tstr)); 3147 return (1); 3148 3149 trunctlv: 3150 ND_PRINT((ndo, "\n\t\t")); 3151 ND_PRINT((ndo, "%s", tstr)); 3152 return(1); 3153 } 3154 3155 static void 3156 osi_print_cksum(netdissect_options *ndo, const uint8_t *pptr, 3157 uint16_t checksum, int checksum_offset, u_int length) 3158 { 3159 uint16_t calculated_checksum; 3160 3161 /* do not attempt to verify the checksum if it is zero, 3162 * if the offset is nonsense, 3163 * or the base pointer is not sane 3164 */ 3165 if (!checksum 3166 || checksum_offset < 0 3167 || !ND_TTEST2(*(pptr + checksum_offset), 2) 3168 || (u_int)checksum_offset > length 3169 || !ND_TTEST2(*pptr, length)) { 3170 ND_PRINT((ndo, " (unverified)")); 3171 } else { 3172 #if 0 3173 printf("\nosi_print_cksum: %p %u %u\n", pptr, checksum_offset, length); 3174 #endif 3175 calculated_checksum = create_osi_cksum(pptr, checksum_offset, length); 3176 if (checksum == calculated_checksum) { 3177 ND_PRINT((ndo, " (correct)")); 3178 } else { 3179 ND_PRINT((ndo, " (incorrect should be 0x%04x)", calculated_checksum)); 3180 } 3181 } 3182 } 3183 3184 /* 3185 * Local Variables: 3186 * c-style: whitesmith 3187 * c-basic-offset: 8 3188 * End: 3189 */ 3190