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Use more ND_TCHECK_n()/ND_TTEST_n() macros
[tcpdump] / print-isoclns.c
1 /*
2 * Copyright (c) 1992, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Original code by Matt Thomas, Digital Equipment Corporation
22 *
23 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
24 * complete IS-IS & CLNP support.
25 */
26
27 /* \summary: ISO CLNS, ESIS, and ISIS printer */
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
32
33 #include <netdissect-stdinc.h>
34
35 #include <string.h>
36
37 #include "netdissect.h"
38 #include "addrtoname.h"
39 #include "ether.h"
40 #include "nlpid.h"
41 #include "extract.h"
42 #include "gmpls.h"
43 #include "oui.h"
44 #include "signature.h"
45
46 static const char tstr[] = " [|isis]";
47
48 /*
49 * IS-IS is defined in ISO 10589. Look there for protocol definitions.
50 */
51
52 #define SYSTEM_ID_LEN ETHER_ADDR_LEN
53 #define NODE_ID_LEN (SYSTEM_ID_LEN+1)
54 #define LSP_ID_LEN (SYSTEM_ID_LEN+2)
55
56 #define ISIS_VERSION 1
57 #define ESIS_VERSION 1
58 #define CLNP_VERSION 1
59
60 #define ISIS_PDU_TYPE_MASK 0x1F
61 #define ESIS_PDU_TYPE_MASK 0x1F
62 #define CLNP_PDU_TYPE_MASK 0x1F
63 #define CLNP_FLAG_MASK 0xE0
64 #define ISIS_LAN_PRIORITY_MASK 0x7F
65
66 #define ISIS_PDU_L1_LAN_IIH 15
67 #define ISIS_PDU_L2_LAN_IIH 16
68 #define ISIS_PDU_PTP_IIH 17
69 #define ISIS_PDU_L1_LSP 18
70 #define ISIS_PDU_L2_LSP 20
71 #define ISIS_PDU_L1_CSNP 24
72 #define ISIS_PDU_L2_CSNP 25
73 #define ISIS_PDU_L1_PSNP 26
74 #define ISIS_PDU_L2_PSNP 27
75
76 static const struct tok isis_pdu_values[] = {
77 { ISIS_PDU_L1_LAN_IIH, "L1 Lan IIH"},
78 { ISIS_PDU_L2_LAN_IIH, "L2 Lan IIH"},
79 { ISIS_PDU_PTP_IIH, "p2p IIH"},
80 { ISIS_PDU_L1_LSP, "L1 LSP"},
81 { ISIS_PDU_L2_LSP, "L2 LSP"},
82 { ISIS_PDU_L1_CSNP, "L1 CSNP"},
83 { ISIS_PDU_L2_CSNP, "L2 CSNP"},
84 { ISIS_PDU_L1_PSNP, "L1 PSNP"},
85 { ISIS_PDU_L2_PSNP, "L2 PSNP"},
86 { 0, NULL}
87 };
88
89 /*
90 * A TLV is a tuple of a type, length and a value and is normally used for
91 * encoding information in all sorts of places. This is an enumeration of
92 * the well known types.
93 *
94 * list taken from rfc3359 plus some memory from veterans ;-)
95 */
96
97 #define ISIS_TLV_AREA_ADDR 1 /* iso10589 */
98 #define ISIS_TLV_IS_REACH 2 /* iso10589 */
99 #define ISIS_TLV_ESNEIGH 3 /* iso10589 */
100 #define ISIS_TLV_PART_DIS 4 /* iso10589 */
101 #define ISIS_TLV_PREFIX_NEIGH 5 /* iso10589 */
102 #define ISIS_TLV_ISNEIGH 6 /* iso10589 */
103 #define ISIS_TLV_ISNEIGH_VARLEN 7 /* iso10589 */
104 #define ISIS_TLV_PADDING 8 /* iso10589 */
105 #define ISIS_TLV_LSP 9 /* iso10589 */
106 #define ISIS_TLV_AUTH 10 /* iso10589, rfc3567 */
107 #define ISIS_TLV_CHECKSUM 12 /* rfc3358 */
108 #define ISIS_TLV_CHECKSUM_MINLEN 2
109 #define ISIS_TLV_POI 13 /* rfc6232 */
110 #define ISIS_TLV_LSP_BUFFERSIZE 14 /* iso10589 rev2 */
111 #define ISIS_TLV_LSP_BUFFERSIZE_MINLEN 2
112 #define ISIS_TLV_EXT_IS_REACH 22 /* rfc5305 */
113 #define ISIS_TLV_IS_ALIAS_ID 24 /* draft-ietf-isis-ext-lsp-frags-02 */
114 #define ISIS_TLV_DECNET_PHASE4 42
115 #define ISIS_TLV_LUCENT_PRIVATE 66
116 #define ISIS_TLV_INT_IP_REACH 128 /* rfc1195, rfc2966 */
117 #define ISIS_TLV_PROTOCOLS 129 /* rfc1195 */
118 #define ISIS_TLV_EXT_IP_REACH 130 /* rfc1195, rfc2966 */
119 #define ISIS_TLV_IDRP_INFO 131 /* rfc1195 */
120 #define ISIS_TLV_IDRP_INFO_MINLEN 1
121 #define ISIS_TLV_IPADDR 132 /* rfc1195 */
122 #define ISIS_TLV_IPAUTH 133 /* rfc1195 */
123 #define ISIS_TLV_TE_ROUTER_ID 134 /* rfc5305 */
124 #define ISIS_TLV_EXTD_IP_REACH 135 /* rfc5305 */
125 #define ISIS_TLV_HOSTNAME 137 /* rfc2763 */
126 #define ISIS_TLV_SHARED_RISK_GROUP 138 /* draft-ietf-isis-gmpls-extensions */
127 #define ISIS_TLV_MT_PORT_CAP 143 /* rfc6165 */
128 #define ISIS_TLV_MT_CAPABILITY 144 /* rfc6329 */
129 #define ISIS_TLV_NORTEL_PRIVATE1 176
130 #define ISIS_TLV_NORTEL_PRIVATE2 177
131 #define ISIS_TLV_RESTART_SIGNALING 211 /* rfc3847 */
132 #define ISIS_TLV_RESTART_SIGNALING_FLAGLEN 1
133 #define ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN 2
134 #define ISIS_TLV_MT_IS_REACH 222 /* draft-ietf-isis-wg-multi-topology-05 */
135 #define ISIS_TLV_MT_SUPPORTED 229 /* draft-ietf-isis-wg-multi-topology-05 */
136 #define ISIS_TLV_MT_SUPPORTED_MINLEN 2
137 #define ISIS_TLV_IP6ADDR 232 /* draft-ietf-isis-ipv6-02 */
138 #define ISIS_TLV_MT_IP_REACH 235 /* draft-ietf-isis-wg-multi-topology-05 */
139 #define ISIS_TLV_IP6_REACH 236 /* draft-ietf-isis-ipv6-02 */
140 #define ISIS_TLV_MT_IP6_REACH 237 /* draft-ietf-isis-wg-multi-topology-05 */
141 #define ISIS_TLV_PTP_ADJ 240 /* rfc3373 */
142 #define ISIS_TLV_IIH_SEQNR 241 /* draft-shen-isis-iih-sequence-00 */
143 #define ISIS_TLV_IIH_SEQNR_MINLEN 4
144 #define ISIS_TLV_VENDOR_PRIVATE 250 /* draft-ietf-isis-experimental-tlv-01 */
145 #define ISIS_TLV_VENDOR_PRIVATE_MINLEN 3
146
147 static const struct tok isis_tlv_values[] = {
148 { ISIS_TLV_AREA_ADDR, "Area address(es)"},
149 { ISIS_TLV_IS_REACH, "IS Reachability"},
150 { ISIS_TLV_ESNEIGH, "ES Neighbor(s)"},
151 { ISIS_TLV_PART_DIS, "Partition DIS"},
152 { ISIS_TLV_PREFIX_NEIGH, "Prefix Neighbors"},
153 { ISIS_TLV_ISNEIGH, "IS Neighbor(s)"},
154 { ISIS_TLV_ISNEIGH_VARLEN, "IS Neighbor(s) (variable length)"},
155 { ISIS_TLV_PADDING, "Padding"},
156 { ISIS_TLV_LSP, "LSP entries"},
157 { ISIS_TLV_AUTH, "Authentication"},
158 { ISIS_TLV_CHECKSUM, "Checksum"},
159 { ISIS_TLV_POI, "Purge Originator Identifier"},
160 { ISIS_TLV_LSP_BUFFERSIZE, "LSP Buffersize"},
161 { ISIS_TLV_EXT_IS_REACH, "Extended IS Reachability"},
162 { ISIS_TLV_IS_ALIAS_ID, "IS Alias ID"},
163 { ISIS_TLV_DECNET_PHASE4, "DECnet Phase IV"},
164 { ISIS_TLV_LUCENT_PRIVATE, "Lucent Proprietary"},
165 { ISIS_TLV_INT_IP_REACH, "IPv4 Internal Reachability"},
166 { ISIS_TLV_PROTOCOLS, "Protocols supported"},
167 { ISIS_TLV_EXT_IP_REACH, "IPv4 External Reachability"},
168 { ISIS_TLV_IDRP_INFO, "Inter-Domain Information Type"},
169 { ISIS_TLV_IPADDR, "IPv4 Interface address(es)"},
170 { ISIS_TLV_IPAUTH, "IPv4 authentication (deprecated)"},
171 { ISIS_TLV_TE_ROUTER_ID, "Traffic Engineering Router ID"},
172 { ISIS_TLV_EXTD_IP_REACH, "Extended IPv4 Reachability"},
173 { ISIS_TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"},
174 { ISIS_TLV_MT_PORT_CAP, "Multi-Topology-Aware Port Capability"},
175 { ISIS_TLV_MT_CAPABILITY, "Multi-Topology Capability"},
176 { ISIS_TLV_NORTEL_PRIVATE1, "Nortel Proprietary"},
177 { ISIS_TLV_NORTEL_PRIVATE2, "Nortel Proprietary"},
178 { ISIS_TLV_HOSTNAME, "Hostname"},
179 { ISIS_TLV_RESTART_SIGNALING, "Restart Signaling"},
180 { ISIS_TLV_MT_IS_REACH, "Multi Topology IS Reachability"},
181 { ISIS_TLV_MT_SUPPORTED, "Multi Topology"},
182 { ISIS_TLV_IP6ADDR, "IPv6 Interface address(es)"},
183 { ISIS_TLV_MT_IP_REACH, "Multi-Topology IPv4 Reachability"},
184 { ISIS_TLV_IP6_REACH, "IPv6 reachability"},
185 { ISIS_TLV_MT_IP6_REACH, "Multi-Topology IP6 Reachability"},
186 { ISIS_TLV_PTP_ADJ, "Point-to-point Adjacency State"},
187 { ISIS_TLV_IIH_SEQNR, "Hello PDU Sequence Number"},
188 { ISIS_TLV_VENDOR_PRIVATE, "Vendor Private"},
189 { 0, NULL }
190 };
191
192 #define ESIS_OPTION_PROTOCOLS 129
193 #define ESIS_OPTION_QOS_MAINTENANCE 195 /* iso9542 */
194 #define ESIS_OPTION_SECURITY 197 /* iso9542 */
195 #define ESIS_OPTION_ES_CONF_TIME 198 /* iso9542 */
196 #define ESIS_OPTION_PRIORITY 205 /* iso9542 */
197 #define ESIS_OPTION_ADDRESS_MASK 225 /* iso9542 */
198 #define ESIS_OPTION_SNPA_MASK 226 /* iso9542 */
199
200 static const struct tok esis_option_values[] = {
201 { ESIS_OPTION_PROTOCOLS, "Protocols supported"},
202 { ESIS_OPTION_QOS_MAINTENANCE, "QoS Maintenance" },
203 { ESIS_OPTION_SECURITY, "Security" },
204 { ESIS_OPTION_ES_CONF_TIME, "ES Configuration Time" },
205 { ESIS_OPTION_PRIORITY, "Priority" },
206 { ESIS_OPTION_ADDRESS_MASK, "Addressk Mask" },
207 { ESIS_OPTION_SNPA_MASK, "SNPA Mask" },
208 { 0, NULL }
209 };
210
211 #define CLNP_OPTION_DISCARD_REASON 193
212 #define CLNP_OPTION_QOS_MAINTENANCE 195 /* iso8473 */
213 #define CLNP_OPTION_SECURITY 197 /* iso8473 */
214 #define CLNP_OPTION_SOURCE_ROUTING 200 /* iso8473 */
215 #define CLNP_OPTION_ROUTE_RECORDING 203 /* iso8473 */
216 #define CLNP_OPTION_PADDING 204 /* iso8473 */
217 #define CLNP_OPTION_PRIORITY 205 /* iso8473 */
218
219 static const struct tok clnp_option_values[] = {
220 { CLNP_OPTION_DISCARD_REASON, "Discard Reason"},
221 { CLNP_OPTION_PRIORITY, "Priority"},
222 { CLNP_OPTION_QOS_MAINTENANCE, "QoS Maintenance"},
223 { CLNP_OPTION_SECURITY, "Security"},
224 { CLNP_OPTION_SOURCE_ROUTING, "Source Routing"},
225 { CLNP_OPTION_ROUTE_RECORDING, "Route Recording"},
226 { CLNP_OPTION_PADDING, "Padding"},
227 { 0, NULL }
228 };
229
230 static const struct tok clnp_option_rfd_class_values[] = {
231 { 0x0, "General"},
232 { 0x8, "Address"},
233 { 0x9, "Source Routeing"},
234 { 0xa, "Lifetime"},
235 { 0xb, "PDU Discarded"},
236 { 0xc, "Reassembly"},
237 { 0, NULL }
238 };
239
240 static const struct tok clnp_option_rfd_general_values[] = {
241 { 0x0, "Reason not specified"},
242 { 0x1, "Protocol procedure error"},
243 { 0x2, "Incorrect checksum"},
244 { 0x3, "PDU discarded due to congestion"},
245 { 0x4, "Header syntax error (cannot be parsed)"},
246 { 0x5, "Segmentation needed but not permitted"},
247 { 0x6, "Incomplete PDU received"},
248 { 0x7, "Duplicate option"},
249 { 0, NULL }
250 };
251
252 static const struct tok clnp_option_rfd_address_values[] = {
253 { 0x0, "Destination address unreachable"},
254 { 0x1, "Destination address unknown"},
255 { 0, NULL }
256 };
257
258 static const struct tok clnp_option_rfd_source_routeing_values[] = {
259 { 0x0, "Unspecified source routeing error"},
260 { 0x1, "Syntax error in source routeing field"},
261 { 0x2, "Unknown address in source routeing field"},
262 { 0x3, "Path not acceptable"},
263 { 0, NULL }
264 };
265
266 static const struct tok clnp_option_rfd_lifetime_values[] = {
267 { 0x0, "Lifetime expired while data unit in transit"},
268 { 0x1, "Lifetime expired during reassembly"},
269 { 0, NULL }
270 };
271
272 static const struct tok clnp_option_rfd_pdu_discard_values[] = {
273 { 0x0, "Unsupported option not specified"},
274 { 0x1, "Unsupported protocol version"},
275 { 0x2, "Unsupported security option"},
276 { 0x3, "Unsupported source routeing option"},
277 { 0x4, "Unsupported recording of route option"},
278 { 0, NULL }
279 };
280
281 static const struct tok clnp_option_rfd_reassembly_values[] = {
282 { 0x0, "Reassembly interference"},
283 { 0, NULL }
284 };
285
286 /* array of 16 error-classes */
287 static const struct tok *clnp_option_rfd_error_class[] = {
288 clnp_option_rfd_general_values,
289 NULL,
290 NULL,
291 NULL,
292 NULL,
293 NULL,
294 NULL,
295 NULL,
296 clnp_option_rfd_address_values,
297 clnp_option_rfd_source_routeing_values,
298 clnp_option_rfd_lifetime_values,
299 clnp_option_rfd_pdu_discard_values,
300 clnp_option_rfd_reassembly_values,
301 NULL,
302 NULL,
303 NULL
304 };
305
306 #define CLNP_OPTION_OPTION_QOS_MASK 0x3f
307 #define CLNP_OPTION_SCOPE_MASK 0xc0
308 #define CLNP_OPTION_SCOPE_SA_SPEC 0x40
309 #define CLNP_OPTION_SCOPE_DA_SPEC 0x80
310 #define CLNP_OPTION_SCOPE_GLOBAL 0xc0
311
312 static const struct tok clnp_option_scope_values[] = {
313 { CLNP_OPTION_SCOPE_SA_SPEC, "Source Address Specific"},
314 { CLNP_OPTION_SCOPE_DA_SPEC, "Destination Address Specific"},
315 { CLNP_OPTION_SCOPE_GLOBAL, "Globally unique"},
316 { 0, NULL }
317 };
318
319 static const struct tok clnp_option_sr_rr_values[] = {
320 { 0x0, "partial"},
321 { 0x1, "complete"},
322 { 0, NULL }
323 };
324
325 static const struct tok clnp_option_sr_rr_string_values[] = {
326 { CLNP_OPTION_SOURCE_ROUTING, "source routing"},
327 { CLNP_OPTION_ROUTE_RECORDING, "recording of route in progress"},
328 { 0, NULL }
329 };
330
331 static const struct tok clnp_option_qos_global_values[] = {
332 { 0x20, "reserved"},
333 { 0x10, "sequencing vs. delay"},
334 { 0x08, "congested"},
335 { 0x04, "delay vs. cost"},
336 { 0x02, "error vs. delay"},
337 { 0x01, "error vs. cost"},
338 { 0, NULL }
339 };
340
341 #define ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* rfc5305 */
342 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* rfc4205 */
343 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* rfc5305 */
344 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* rfc5305 */
345 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* rfc5305 */
346 #define ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* rfc5305 */
347 #define ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* rfc5305 */
348 #define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* rfc4124 */
349 #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD 12 /* draft-ietf-tewg-diff-te-proto-06 */
350 #define ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* rfc5305 */
351 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE 19 /* draft-ietf-isis-link-attr-01 */
352 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* rfc4205 */
353 #define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* rfc4205 */
354 #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS 22 /* rfc4124 */
355
356 #define ISIS_SUBTLV_SPB_METRIC 29 /* rfc6329 */
357
358 static const struct tok isis_ext_is_reach_subtlv_values[] = {
359 { ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP, "Administrative groups" },
360 { ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
361 { ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID, "Link Remote Identifier" },
362 { ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR, "IPv4 interface address" },
363 { ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR, "IPv4 neighbor address" },
364 { ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW, "Maximum link bandwidth" },
365 { ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW, "Reservable link bandwidth" },
366 { ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW, "Unreserved bandwidth" },
367 { ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC, "Traffic Engineering Metric" },
368 { ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE, "Link Attribute" },
369 { ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE, "Link Protection Type" },
370 { ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR, "Interface Switching Capability" },
371 { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD, "Bandwidth Constraints (old)" },
372 { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS, "Bandwidth Constraints" },
373 { ISIS_SUBTLV_SPB_METRIC, "SPB Metric" },
374 { 250, "Reserved for cisco specific extensions" },
375 { 251, "Reserved for cisco specific extensions" },
376 { 252, "Reserved for cisco specific extensions" },
377 { 253, "Reserved for cisco specific extensions" },
378 { 254, "Reserved for cisco specific extensions" },
379 { 255, "Reserved for future expansion" },
380 { 0, NULL }
381 };
382
383 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32 1 /* draft-ietf-isis-admin-tags-01 */
384 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64 2 /* draft-ietf-isis-admin-tags-01 */
385 #define ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR 117 /* draft-ietf-isis-wg-multi-topology-05 */
386
387 static const struct tok isis_ext_ip_reach_subtlv_values[] = {
388 { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32, "32-Bit Administrative tag" },
389 { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64, "64-Bit Administrative tag" },
390 { ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR, "Management Prefix Color" },
391 { 0, NULL }
392 };
393
394 static const struct tok isis_subtlv_link_attribute_values[] = {
395 { 0x01, "Local Protection Available" },
396 { 0x02, "Link excluded from local protection path" },
397 { 0x04, "Local maintenance required"},
398 { 0, NULL }
399 };
400
401 #define ISIS_SUBTLV_AUTH_SIMPLE 1
402 #define ISIS_SUBTLV_AUTH_GENERIC 3 /* rfc 5310 */
403 #define ISIS_SUBTLV_AUTH_MD5 54
404 #define ISIS_SUBTLV_AUTH_MD5_LEN 16
405 #define ISIS_SUBTLV_AUTH_PRIVATE 255
406
407 static const struct tok isis_subtlv_auth_values[] = {
408 { ISIS_SUBTLV_AUTH_SIMPLE, "simple text password"},
409 { ISIS_SUBTLV_AUTH_GENERIC, "Generic Crypto key-id"},
410 { ISIS_SUBTLV_AUTH_MD5, "HMAC-MD5 password"},
411 { ISIS_SUBTLV_AUTH_PRIVATE, "Routing Domain private password"},
412 { 0, NULL }
413 };
414
415 #define ISIS_SUBTLV_IDRP_RES 0
416 #define ISIS_SUBTLV_IDRP_LOCAL 1
417 #define ISIS_SUBTLV_IDRP_ASN 2
418
419 static const struct tok isis_subtlv_idrp_values[] = {
420 { ISIS_SUBTLV_IDRP_RES, "Reserved"},
421 { ISIS_SUBTLV_IDRP_LOCAL, "Routing-Domain Specific"},
422 { ISIS_SUBTLV_IDRP_ASN, "AS Number Tag"},
423 { 0, NULL}
424 };
425
426 #define ISIS_SUBTLV_SPB_MCID 4
427 #define ISIS_SUBTLV_SPB_DIGEST 5
428 #define ISIS_SUBTLV_SPB_BVID 6
429
430 #define ISIS_SUBTLV_SPB_INSTANCE 1
431 #define ISIS_SUBTLV_SPBM_SI 3
432
433 #define ISIS_SPB_MCID_LEN 51
434 #define ISIS_SUBTLV_SPB_MCID_MIN_LEN 102
435 #define ISIS_SUBTLV_SPB_DIGEST_MIN_LEN 33
436 #define ISIS_SUBTLV_SPB_BVID_MIN_LEN 6
437 #define ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN 19
438 #define ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN 8
439
440 static const struct tok isis_mt_port_cap_subtlv_values[] = {
441 { ISIS_SUBTLV_SPB_MCID, "SPB MCID" },
442 { ISIS_SUBTLV_SPB_DIGEST, "SPB Digest" },
443 { ISIS_SUBTLV_SPB_BVID, "SPB BVID" },
444 { 0, NULL }
445 };
446
447 static const struct tok isis_mt_capability_subtlv_values[] = {
448 { ISIS_SUBTLV_SPB_INSTANCE, "SPB Instance" },
449 { ISIS_SUBTLV_SPBM_SI, "SPBM Service Identifier and Unicast Address" },
450 { 0, NULL }
451 };
452
453 struct isis_spb_mcid {
454 uint8_t format_id;
455 uint8_t name[32];
456 uint8_t revision_lvl[2];
457 uint8_t digest[16];
458 };
459
460 struct isis_subtlv_spb_mcid {
461 struct isis_spb_mcid mcid;
462 struct isis_spb_mcid aux_mcid;
463 };
464
465 struct isis_subtlv_spb_instance {
466 uint8_t cist_root_id[8];
467 uint8_t cist_external_root_path_cost[4];
468 uint8_t bridge_priority[2];
469 uint8_t spsourceid[4];
470 uint8_t no_of_trees;
471 };
472
473 #define CLNP_SEGMENT_PART 0x80
474 #define CLNP_MORE_SEGMENTS 0x40
475 #define CLNP_REQUEST_ER 0x20
476
477 static const struct tok clnp_flag_values[] = {
478 { CLNP_SEGMENT_PART, "Segmentation permitted"},
479 { CLNP_MORE_SEGMENTS, "more Segments"},
480 { CLNP_REQUEST_ER, "request Error Report"},
481 { 0, NULL}
482 };
483
484 #define ISIS_MASK_LSP_OL_BIT(x) ((x)&0x4)
485 #define ISIS_MASK_LSP_ISTYPE_BITS(x) ((x)&0x3)
486 #define ISIS_MASK_LSP_PARTITION_BIT(x) ((x)&0x80)
487 #define ISIS_MASK_LSP_ATT_BITS(x) ((x)&0x78)
488 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x) ((x)&0x40)
489 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) ((x)&0x20)
490 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x) ((x)&0x10)
491 #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) ((x)&0x8)
492
493 #define ISIS_MASK_MTID(x) ((x)&0x0fff)
494 #define ISIS_MASK_MTFLAGS(x) ((x)&0xf000)
495
496 static const struct tok isis_mt_flag_values[] = {
497 { 0x4000, "ATT bit set"},
498 { 0x8000, "Overload bit set"},
499 { 0, NULL}
500 };
501
502 #define ISIS_MASK_TLV_EXTD_IP_UPDOWN(x) ((x)&0x80)
503 #define ISIS_MASK_TLV_EXTD_IP_SUBTLV(x) ((x)&0x40)
504
505 #define ISIS_MASK_TLV_EXTD_IP6_IE(x) ((x)&0x40)
506 #define ISIS_MASK_TLV_EXTD_IP6_SUBTLV(x) ((x)&0x20)
507
508 #define ISIS_LSP_TLV_METRIC_SUPPORTED(x) ((x)&0x80)
509 #define ISIS_LSP_TLV_METRIC_IE(x) ((x)&0x40)
510 #define ISIS_LSP_TLV_METRIC_UPDOWN(x) ((x)&0x80)
511 #define ISIS_LSP_TLV_METRIC_VALUE(x) ((x)&0x3f)
512
513 #define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1)
514
515 static const struct tok isis_mt_values[] = {
516 { 0, "IPv4 unicast"},
517 { 1, "In-Band Management"},
518 { 2, "IPv6 unicast"},
519 { 3, "Multicast"},
520 { 4095, "Development, Experimental or Proprietary"},
521 { 0, NULL }
522 };
523
524 static const struct tok isis_iih_circuit_type_values[] = {
525 { 1, "Level 1 only"},
526 { 2, "Level 2 only"},
527 { 3, "Level 1, Level 2"},
528 { 0, NULL}
529 };
530
531 #define ISIS_LSP_TYPE_UNUSED0 0
532 #define ISIS_LSP_TYPE_LEVEL_1 1
533 #define ISIS_LSP_TYPE_UNUSED2 2
534 #define ISIS_LSP_TYPE_LEVEL_2 3
535
536 static const struct tok isis_lsp_istype_values[] = {
537 { ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"},
538 { ISIS_LSP_TYPE_LEVEL_1, "L1 IS"},
539 { ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"},
540 { ISIS_LSP_TYPE_LEVEL_2, "L2 IS"},
541 { 0, NULL }
542 };
543
544 /*
545 * Katz's point to point adjacency TLV uses codes to tell us the state of
546 * the remote adjacency. Enumerate them.
547 */
548
549 #define ISIS_PTP_ADJ_UP 0
550 #define ISIS_PTP_ADJ_INIT 1
551 #define ISIS_PTP_ADJ_DOWN 2
552
553 static const struct tok isis_ptp_adjancey_values[] = {
554 { ISIS_PTP_ADJ_UP, "Up" },
555 { ISIS_PTP_ADJ_INIT, "Initializing" },
556 { ISIS_PTP_ADJ_DOWN, "Down" },
557 { 0, NULL}
558 };
559
560 struct isis_tlv_ptp_adj {
561 uint8_t adjacency_state;
562 uint8_t extd_local_circuit_id[4];
563 uint8_t neighbor_sysid[SYSTEM_ID_LEN];
564 uint8_t neighbor_extd_local_circuit_id[4];
565 };
566
567 static void osi_print_cksum(netdissect_options *, const uint8_t *pptr,
568 uint16_t checksum, int checksum_offset, u_int length);
569 static int clnp_print(netdissect_options *, const uint8_t *, u_int);
570 static void esis_print(netdissect_options *, const uint8_t *, u_int);
571 static int isis_print(netdissect_options *, const uint8_t *, u_int);
572
573 struct isis_metric_block {
574 uint8_t metric_default;
575 uint8_t metric_delay;
576 uint8_t metric_expense;
577 uint8_t metric_error;
578 };
579
580 struct isis_tlv_is_reach {
581 struct isis_metric_block isis_metric_block;
582 uint8_t neighbor_nodeid[NODE_ID_LEN];
583 };
584
585 struct isis_tlv_es_reach {
586 struct isis_metric_block isis_metric_block;
587 uint8_t neighbor_sysid[SYSTEM_ID_LEN];
588 };
589
590 struct isis_tlv_ip_reach {
591 struct isis_metric_block isis_metric_block;
592 uint8_t prefix[4];
593 uint8_t mask[4];
594 };
595
596 static const struct tok isis_is_reach_virtual_values[] = {
597 { 0, "IsNotVirtual"},
598 { 1, "IsVirtual"},
599 { 0, NULL }
600 };
601
602 static const struct tok isis_restart_flag_values[] = {
603 { 0x1, "Restart Request"},
604 { 0x2, "Restart Acknowledgement"},
605 { 0x4, "Suppress adjacency advertisement"},
606 { 0, NULL }
607 };
608
609 struct isis_common_header {
610 uint8_t nlpid;
611 uint8_t fixed_len;
612 uint8_t version; /* Protocol version */
613 uint8_t id_length;
614 uint8_t pdu_type; /* 3 MSbits are reserved */
615 uint8_t pdu_version; /* Packet format version */
616 uint8_t reserved;
617 uint8_t max_area;
618 };
619
620 struct isis_iih_lan_header {
621 uint8_t circuit_type;
622 uint8_t source_id[SYSTEM_ID_LEN];
623 uint8_t holding_time[2];
624 uint8_t pdu_len[2];
625 uint8_t priority;
626 uint8_t lan_id[NODE_ID_LEN];
627 };
628
629 struct isis_iih_ptp_header {
630 uint8_t circuit_type;
631 uint8_t source_id[SYSTEM_ID_LEN];
632 uint8_t holding_time[2];
633 uint8_t pdu_len[2];
634 uint8_t circuit_id;
635 };
636
637 struct isis_lsp_header {
638 uint8_t pdu_len[2];
639 uint8_t remaining_lifetime[2];
640 uint8_t lsp_id[LSP_ID_LEN];
641 uint8_t sequence_number[4];
642 uint8_t checksum[2];
643 uint8_t typeblock;
644 };
645
646 struct isis_csnp_header {
647 uint8_t pdu_len[2];
648 uint8_t source_id[NODE_ID_LEN];
649 uint8_t start_lsp_id[LSP_ID_LEN];
650 uint8_t end_lsp_id[LSP_ID_LEN];
651 };
652
653 struct isis_psnp_header {
654 uint8_t pdu_len[2];
655 uint8_t source_id[NODE_ID_LEN];
656 };
657
658 struct isis_tlv_lsp {
659 uint8_t remaining_lifetime[2];
660 uint8_t lsp_id[LSP_ID_LEN];
661 uint8_t sequence_number[4];
662 uint8_t checksum[2];
663 };
664
665 #define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
666 #define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header))
667 #define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header))
668 #define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header))
669 #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header))
670 #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header))
671
672 void
673 isoclns_print(netdissect_options *ndo, const uint8_t *p, u_int length)
674 {
675 if (!ND_TTEST(*p)) { /* enough bytes on the wire ? */
676 ND_PRINT((ndo, "|OSI"));
677 return;
678 }
679
680 if (ndo->ndo_eflag)
681 ND_PRINT((ndo, "OSI NLPID %s (0x%02x): ", tok2str(nlpid_values, "Unknown", EXTRACT_U_1(p)), *p));
682
683 switch (*p) {
684
685 case NLPID_CLNP:
686 if (!clnp_print(ndo, p, length))
687 print_unknown_data(ndo, p, "\n\t", length);
688 break;
689
690 case NLPID_ESIS:
691 esis_print(ndo, p, length);
692 return;
693
694 case NLPID_ISIS:
695 if (!isis_print(ndo, p, length))
696 print_unknown_data(ndo, p, "\n\t", length);
697 break;
698
699 case NLPID_NULLNS:
700 ND_PRINT((ndo, "%slength: %u", ndo->ndo_eflag ? "" : ", ", length));
701 break;
702
703 case NLPID_Q933:
704 q933_print(ndo, p + 1, length - 1);
705 break;
706
707 case NLPID_IP:
708 ip_print(ndo, p + 1, length - 1);
709 break;
710
711 case NLPID_IP6:
712 ip6_print(ndo, p + 1, length - 1);
713 break;
714
715 case NLPID_PPP:
716 ppp_print(ndo, p + 1, length - 1);
717 break;
718
719 default:
720 if (!ndo->ndo_eflag)
721 ND_PRINT((ndo, "OSI NLPID 0x%02x unknown", *p));
722 ND_PRINT((ndo, "%slength: %u", ndo->ndo_eflag ? "" : ", ", length));
723 if (length > 1)
724 print_unknown_data(ndo, p, "\n\t", length);
725 break;
726 }
727 }
728
729 #define CLNP_PDU_ER 1
730 #define CLNP_PDU_DT 28
731 #define CLNP_PDU_MD 29
732 #define CLNP_PDU_ERQ 30
733 #define CLNP_PDU_ERP 31
734
735 static const struct tok clnp_pdu_values[] = {
736 { CLNP_PDU_ER, "Error Report"},
737 { CLNP_PDU_MD, "MD"},
738 { CLNP_PDU_DT, "Data"},
739 { CLNP_PDU_ERQ, "Echo Request"},
740 { CLNP_PDU_ERP, "Echo Response"},
741 { 0, NULL }
742 };
743
744 struct clnp_header_t {
745 uint8_t nlpid;
746 uint8_t length_indicator;
747 uint8_t version;
748 uint8_t lifetime; /* units of 500ms */
749 uint8_t type;
750 uint8_t segment_length[2];
751 uint8_t cksum[2];
752 };
753
754 struct clnp_segment_header_t {
755 uint8_t data_unit_id[2];
756 uint8_t segment_offset[2];
757 uint8_t total_length[2];
758 };
759
760 /*
761 * clnp_print
762 * Decode CLNP packets. Return 0 on error.
763 */
764
765 static int
766 clnp_print(netdissect_options *ndo,
767 const uint8_t *pptr, u_int length)
768 {
769 const uint8_t *optr,*source_address,*dest_address;
770 u_int li,tlen,nsap_offset,source_address_length,dest_address_length, clnp_pdu_type, clnp_flags;
771 const struct clnp_header_t *clnp_header;
772 const struct clnp_segment_header_t *clnp_segment_header;
773 uint8_t rfd_error,rfd_error_major,rfd_error_minor;
774
775 clnp_header = (const struct clnp_header_t *) pptr;
776 ND_TCHECK(*clnp_header);
777
778 li = clnp_header->length_indicator;
779 optr = pptr;
780
781 if (!ndo->ndo_eflag)
782 ND_PRINT((ndo, "CLNP"));
783
784 /*
785 * Sanity checking of the header.
786 */
787
788 if (clnp_header->version != CLNP_VERSION) {
789 ND_PRINT((ndo, "version %d packet not supported", clnp_header->version));
790 return (0);
791 }
792
793 if (li > length) {
794 ND_PRINT((ndo, " length indicator(%u) > PDU size (%u)!", li, length));
795 return (0);
796 }
797
798 if (li < sizeof(struct clnp_header_t)) {
799 ND_PRINT((ndo, " length indicator %u < min PDU size:", li));
800 while (pptr < ndo->ndo_snapend) {
801 ND_PRINT((ndo, "%02X", EXTRACT_U_1(pptr)));
802 pptr++;
803 }
804 return (0);
805 }
806
807 /* FIXME further header sanity checking */
808
809 clnp_pdu_type = clnp_header->type & CLNP_PDU_TYPE_MASK;
810 clnp_flags = clnp_header->type & CLNP_FLAG_MASK;
811
812 pptr += sizeof(struct clnp_header_t);
813 li -= sizeof(struct clnp_header_t);
814
815 if (li < 1) {
816 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses"));
817 return (0);
818 }
819 ND_TCHECK(*pptr);
820 dest_address_length = EXTRACT_U_1(pptr);
821 pptr += 1;
822 li -= 1;
823 if (li < dest_address_length) {
824 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses"));
825 return (0);
826 }
827 ND_TCHECK2(*pptr, dest_address_length);
828 dest_address = pptr;
829 pptr += dest_address_length;
830 li -= dest_address_length;
831
832 if (li < 1) {
833 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses"));
834 return (0);
835 }
836 ND_TCHECK(*pptr);
837 source_address_length = EXTRACT_U_1(pptr);
838 pptr += 1;
839 li -= 1;
840 if (li < source_address_length) {
841 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses"));
842 return (0);
843 }
844 ND_TCHECK2(*pptr, source_address_length);
845 source_address = pptr;
846 pptr += source_address_length;
847 li -= source_address_length;
848
849 if (ndo->ndo_vflag < 1) {
850 ND_PRINT((ndo, "%s%s > %s, %s, length %u",
851 ndo->ndo_eflag ? "" : ", ",
852 isonsap_string(ndo, source_address, source_address_length),
853 isonsap_string(ndo, dest_address, dest_address_length),
854 tok2str(clnp_pdu_values,"unknown (%u)",clnp_pdu_type),
855 length));
856 return (1);
857 }
858 ND_PRINT((ndo, "%slength %u", ndo->ndo_eflag ? "" : ", ", length));
859
860 ND_PRINT((ndo, "\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x",
861 tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type),
862 clnp_header->length_indicator,
863 clnp_header->version,
864 clnp_header->lifetime/2,
865 (clnp_header->lifetime%2)*5,
866 EXTRACT_BE_U_2(clnp_header->segment_length),
867 EXTRACT_BE_U_2(clnp_header->cksum)));
868
869 osi_print_cksum(ndo, optr, EXTRACT_BE_U_2(clnp_header->cksum), 7,
870 clnp_header->length_indicator);
871
872 ND_PRINT((ndo, "\n\tFlags [%s]",
873 bittok2str(clnp_flag_values, "none", clnp_flags)));
874
875 ND_PRINT((ndo, "\n\tsource address (length %u): %s\n\tdest address (length %u): %s",
876 source_address_length,
877 isonsap_string(ndo, source_address, source_address_length),
878 dest_address_length,
879 isonsap_string(ndo, dest_address, dest_address_length)));
880
881 if (clnp_flags & CLNP_SEGMENT_PART) {
882 if (li < sizeof(struct clnp_segment_header_t)) {
883 ND_PRINT((ndo, "li < size of fixed part of CLNP header, addresses, and segment part"));
884 return (0);
885 }
886 clnp_segment_header = (const struct clnp_segment_header_t *) pptr;
887 ND_TCHECK(*clnp_segment_header);
888 ND_PRINT((ndo, "\n\tData Unit ID: 0x%04x, Segment Offset: %u, Total PDU Length: %u",
889 EXTRACT_BE_U_2(clnp_segment_header->data_unit_id),
890 EXTRACT_BE_U_2(clnp_segment_header->segment_offset),
891 EXTRACT_BE_U_2(clnp_segment_header->total_length)));
892 pptr+=sizeof(struct clnp_segment_header_t);
893 li-=sizeof(struct clnp_segment_header_t);
894 }
895
896 /* now walk the options */
897 while (li >= 2) {
898 u_int op, opli;
899 const uint8_t *tptr;
900
901 if (li < 2) {
902 ND_PRINT((ndo, ", bad opts/li"));
903 return (0);
904 }
905 ND_TCHECK_2(pptr);
906 op = EXTRACT_U_1(pptr);
907 opli = EXTRACT_U_1(pptr + 1);
908 pptr += 2;
909 li -= 2;
910 if (opli > li) {
911 ND_PRINT((ndo, ", opt (%d) too long", op));
912 return (0);
913 }
914 ND_TCHECK2(*pptr, opli);
915 li -= opli;
916 tptr = pptr;
917 tlen = opli;
918
919 ND_PRINT((ndo, "\n\t %s Option #%u, length %u, value: ",
920 tok2str(clnp_option_values,"Unknown",op),
921 op,
922 opli));
923
924 /*
925 * We've already checked that the entire option is present
926 * in the captured packet with the ND_TCHECK2() call.
927 * Therefore, we don't need to do ND_TCHECK()/ND_TCHECK2()
928 * checks.
929 * We do, however, need to check tlen, to make sure we
930 * don't run past the end of the option.
931 */
932 switch (op) {
933
934
935 case CLNP_OPTION_ROUTE_RECORDING: /* those two options share the format */
936 case CLNP_OPTION_SOURCE_ROUTING:
937 if (tlen < 2) {
938 ND_PRINT((ndo, ", bad opt len"));
939 return (0);
940 }
941 ND_PRINT((ndo, "%s %s",
942 tok2str(clnp_option_sr_rr_values,"Unknown",EXTRACT_U_1(tptr)),
943 tok2str(clnp_option_sr_rr_string_values, "Unknown Option %u", op)));
944 nsap_offset=EXTRACT_U_1(tptr + 1);
945 if (nsap_offset == 0) {
946 ND_PRINT((ndo, " Bad NSAP offset (0)"));
947 break;
948 }
949 nsap_offset-=1; /* offset to nsap list */
950 if (nsap_offset > tlen) {
951 ND_PRINT((ndo, " Bad NSAP offset (past end of option)"));
952 break;
953 }
954 tptr+=nsap_offset;
955 tlen-=nsap_offset;
956 while (tlen > 0) {
957 source_address_length=EXTRACT_U_1(tptr);
958 if (tlen < source_address_length+1) {
959 ND_PRINT((ndo, "\n\t NSAP address goes past end of option"));
960 break;
961 }
962 if (source_address_length > 0) {
963 source_address=(tptr+1);
964 ND_TCHECK2(*source_address, source_address_length);
965 ND_PRINT((ndo, "\n\t NSAP address (length %u): %s",
966 source_address_length,
967 isonsap_string(ndo, source_address, source_address_length)));
968 }
969 tlen-=source_address_length+1;
970 }
971 break;
972
973 case CLNP_OPTION_PRIORITY:
974 if (tlen < 1) {
975 ND_PRINT((ndo, ", bad opt len"));
976 return (0);
977 }
978 ND_PRINT((ndo, "0x%1x", EXTRACT_U_1(tptr)&0x0f));
979 break;
980
981 case CLNP_OPTION_QOS_MAINTENANCE:
982 if (tlen < 1) {
983 ND_PRINT((ndo, ", bad opt len"));
984 return (0);
985 }
986 ND_PRINT((ndo, "\n\t Format Code: %s",
987 tok2str(clnp_option_scope_values, "Reserved", EXTRACT_U_1(tptr) & CLNP_OPTION_SCOPE_MASK)));
988
989 if ((EXTRACT_U_1(tptr)&CLNP_OPTION_SCOPE_MASK) == CLNP_OPTION_SCOPE_GLOBAL)
990 ND_PRINT((ndo, "\n\t QoS Flags [%s]",
991 bittok2str(clnp_option_qos_global_values,
992 "none",
993 EXTRACT_U_1(tptr)&CLNP_OPTION_OPTION_QOS_MASK)));
994 break;
995
996 case CLNP_OPTION_SECURITY:
997 if (tlen < 2) {
998 ND_PRINT((ndo, ", bad opt len"));
999 return (0);
1000 }
1001 ND_PRINT((ndo, "\n\t Format Code: %s, Security-Level %u",
1002 tok2str(clnp_option_scope_values,"Reserved",EXTRACT_U_1(tptr)&CLNP_OPTION_SCOPE_MASK),
1003 EXTRACT_U_1(tptr + 1)));
1004 break;
1005
1006 case CLNP_OPTION_DISCARD_REASON:
1007 if (tlen < 1) {
1008 ND_PRINT((ndo, ", bad opt len"));
1009 return (0);
1010 }
1011 rfd_error = EXTRACT_U_1(tptr);
1012 rfd_error_major = (rfd_error&0xf0) >> 4;
1013 rfd_error_minor = rfd_error&0x0f;
1014 ND_PRINT((ndo, "\n\t Class: %s Error (0x%01x), %s (0x%01x)",
1015 tok2str(clnp_option_rfd_class_values,"Unknown",rfd_error_major),
1016 rfd_error_major,
1017 tok2str(clnp_option_rfd_error_class[rfd_error_major],"Unknown",rfd_error_minor),
1018 rfd_error_minor));
1019 break;
1020
1021 case CLNP_OPTION_PADDING:
1022 ND_PRINT((ndo, "padding data"));
1023 break;
1024
1025 /*
1026 * FIXME those are the defined Options that lack a decoder
1027 * you are welcome to contribute code ;-)
1028 */
1029
1030 default:
1031 print_unknown_data(ndo, tptr, "\n\t ", opli);
1032 break;
1033 }
1034 if (ndo->ndo_vflag > 1)
1035 print_unknown_data(ndo, pptr, "\n\t ", opli);
1036 pptr += opli;
1037 }
1038
1039 switch (clnp_pdu_type) {
1040
1041 case CLNP_PDU_ER: /* fall through */
1042 case CLNP_PDU_ERP:
1043 ND_TCHECK(*pptr);
1044 if (EXTRACT_U_1(pptr) == NLPID_CLNP) {
1045 ND_PRINT((ndo, "\n\t-----original packet-----\n\t"));
1046 /* FIXME recursion protection */
1047 clnp_print(ndo, pptr, length - clnp_header->length_indicator);
1048 break;
1049 }
1050
1051 case CLNP_PDU_DT:
1052 case CLNP_PDU_MD:
1053 case CLNP_PDU_ERQ:
1054
1055 default:
1056 /* dump the PDU specific data */
1057 if (length-(pptr-optr) > 0) {
1058 ND_PRINT((ndo, "\n\t undecoded non-header data, length %u", length-clnp_header->length_indicator));
1059 print_unknown_data(ndo, pptr, "\n\t ", length - (pptr - optr));
1060 }
1061 }
1062
1063 return (1);
1064
1065 trunc:
1066 ND_PRINT((ndo, "[|clnp]"));
1067 return (1);
1068
1069 }
1070
1071
1072 #define ESIS_PDU_REDIRECT 6
1073 #define ESIS_PDU_ESH 2
1074 #define ESIS_PDU_ISH 4
1075
1076 static const struct tok esis_pdu_values[] = {
1077 { ESIS_PDU_REDIRECT, "redirect"},
1078 { ESIS_PDU_ESH, "ESH"},
1079 { ESIS_PDU_ISH, "ISH"},
1080 { 0, NULL }
1081 };
1082
1083 struct esis_header_t {
1084 uint8_t nlpid;
1085 uint8_t length_indicator;
1086 uint8_t version;
1087 uint8_t reserved;
1088 uint8_t type;
1089 uint8_t holdtime[2];
1090 uint8_t cksum[2];
1091 };
1092
1093 static void
1094 esis_print(netdissect_options *ndo,
1095 const uint8_t *pptr, u_int length)
1096 {
1097 const uint8_t *optr;
1098 u_int li,esis_pdu_type,source_address_length, source_address_number;
1099 const struct esis_header_t *esis_header;
1100
1101 if (!ndo->ndo_eflag)
1102 ND_PRINT((ndo, "ES-IS"));
1103
1104 if (length <= 2) {
1105 ND_PRINT((ndo, ndo->ndo_qflag ? "bad pkt!" : "no header at all!"));
1106 return;
1107 }
1108
1109 esis_header = (const struct esis_header_t *) pptr;
1110 ND_TCHECK(*esis_header);
1111 li = esis_header->length_indicator;
1112 optr = pptr;
1113
1114 /*
1115 * Sanity checking of the header.
1116 */
1117
1118 if (esis_header->nlpid != NLPID_ESIS) {
1119 ND_PRINT((ndo, " nlpid 0x%02x packet not supported", esis_header->nlpid));
1120 return;
1121 }
1122
1123 if (esis_header->version != ESIS_VERSION) {
1124 ND_PRINT((ndo, " version %d packet not supported", esis_header->version));
1125 return;
1126 }
1127
1128 if (li > length) {
1129 ND_PRINT((ndo, " length indicator(%u) > PDU size (%u)!", li, length));
1130 return;
1131 }
1132
1133 if (li < sizeof(struct esis_header_t) + 2) {
1134 ND_PRINT((ndo, " length indicator %u < min PDU size:", li));
1135 while (pptr < ndo->ndo_snapend) {
1136 ND_PRINT((ndo, "%02X", EXTRACT_U_1(pptr)));
1137 pptr++;
1138 }
1139 return;
1140 }
1141
1142 esis_pdu_type = esis_header->type & ESIS_PDU_TYPE_MASK;
1143
1144 if (ndo->ndo_vflag < 1) {
1145 ND_PRINT((ndo, "%s%s, length %u",
1146 ndo->ndo_eflag ? "" : ", ",
1147 tok2str(esis_pdu_values,"unknown type (%u)",esis_pdu_type),
1148 length));
1149 return;
1150 } else
1151 ND_PRINT((ndo, "%slength %u\n\t%s (%u)",
1152 ndo->ndo_eflag ? "" : ", ",
1153 length,
1154 tok2str(esis_pdu_values,"unknown type: %u", esis_pdu_type),
1155 esis_pdu_type));
1156
1157 ND_PRINT((ndo, ", v: %u%s", esis_header->version, esis_header->version == ESIS_VERSION ? "" : "unsupported" ));
1158 ND_PRINT((ndo, ", checksum: 0x%04x", EXTRACT_BE_U_2(esis_header->cksum)));
1159
1160 osi_print_cksum(ndo, pptr, EXTRACT_BE_U_2(esis_header->cksum), 7,
1161 li);
1162
1163 ND_PRINT((ndo, ", holding time: %us, length indicator: %u",
1164 EXTRACT_BE_U_2(esis_header->holdtime), li));
1165
1166 if (ndo->ndo_vflag > 1)
1167 print_unknown_data(ndo, optr, "\n\t", sizeof(struct esis_header_t));
1168
1169 pptr += sizeof(struct esis_header_t);
1170 li -= sizeof(struct esis_header_t);
1171
1172 switch (esis_pdu_type) {
1173 case ESIS_PDU_REDIRECT: {
1174 const uint8_t *dst, *snpa, *neta;
1175 u_int dstl, snpal, netal;
1176
1177 ND_TCHECK(*pptr);
1178 if (li < 1) {
1179 ND_PRINT((ndo, ", bad redirect/li"));
1180 return;
1181 }
1182 dstl = EXTRACT_U_1(pptr);
1183 pptr++;
1184 li--;
1185 ND_TCHECK2(*pptr, dstl);
1186 if (li < dstl) {
1187 ND_PRINT((ndo, ", bad redirect/li"));
1188 return;
1189 }
1190 dst = pptr;
1191 pptr += dstl;
1192 li -= dstl;
1193 ND_PRINT((ndo, "\n\t %s", isonsap_string(ndo, dst, dstl)));
1194
1195 ND_TCHECK(*pptr);
1196 if (li < 1) {
1197 ND_PRINT((ndo, ", bad redirect/li"));
1198 return;
1199 }
1200 snpal = EXTRACT_U_1(pptr);
1201 pptr++;
1202 li--;
1203 ND_TCHECK2(*pptr, snpal);
1204 if (li < snpal) {
1205 ND_PRINT((ndo, ", bad redirect/li"));
1206 return;
1207 }
1208 snpa = pptr;
1209 pptr += snpal;
1210 li -= snpal;
1211 ND_TCHECK(*pptr);
1212 if (li < 1) {
1213 ND_PRINT((ndo, ", bad redirect/li"));
1214 return;
1215 }
1216 netal = EXTRACT_U_1(pptr);
1217 pptr++;
1218 ND_TCHECK2(*pptr, netal);
1219 if (li < netal) {
1220 ND_PRINT((ndo, ", bad redirect/li"));
1221 return;
1222 }
1223 neta = pptr;
1224 pptr += netal;
1225 li -= netal;
1226
1227 if (snpal == 6)
1228 ND_PRINT((ndo, "\n\t SNPA (length: %u): %s",
1229 snpal,
1230 etheraddr_string(ndo, snpa)));
1231 else
1232 ND_PRINT((ndo, "\n\t SNPA (length: %u): %s",
1233 snpal,
1234 linkaddr_string(ndo, snpa, LINKADDR_OTHER, snpal)));
1235 if (netal != 0)
1236 ND_PRINT((ndo, "\n\t NET (length: %u) %s",
1237 netal,
1238 isonsap_string(ndo, neta, netal)));
1239 break;
1240 }
1241
1242 case ESIS_PDU_ESH:
1243 ND_TCHECK(*pptr);
1244 if (li < 1) {
1245 ND_PRINT((ndo, ", bad esh/li"));
1246 return;
1247 }
1248 source_address_number = EXTRACT_U_1(pptr);
1249 pptr++;
1250 li--;
1251
1252 ND_PRINT((ndo, "\n\t Number of Source Addresses: %u", source_address_number));
1253
1254 while (source_address_number > 0) {
1255 ND_TCHECK(*pptr);
1256 if (li < 1) {
1257 ND_PRINT((ndo, ", bad esh/li"));
1258 return;
1259 }
1260 source_address_length = EXTRACT_U_1(pptr);
1261 pptr++;
1262 li--;
1263
1264 ND_TCHECK2(*pptr, source_address_length);
1265 if (li < source_address_length) {
1266 ND_PRINT((ndo, ", bad esh/li"));
1267 return;
1268 }
1269 ND_PRINT((ndo, "\n\t NET (length: %u): %s",
1270 source_address_length,
1271 isonsap_string(ndo, pptr, source_address_length)));
1272 pptr += source_address_length;
1273 li -= source_address_length;
1274 source_address_number--;
1275 }
1276
1277 break;
1278
1279 case ESIS_PDU_ISH: {
1280 ND_TCHECK(*pptr);
1281 if (li < 1) {
1282 ND_PRINT((ndo, ", bad ish/li"));
1283 return;
1284 }
1285 source_address_length = EXTRACT_U_1(pptr);
1286 pptr++;
1287 li--;
1288 ND_TCHECK2(*pptr, source_address_length);
1289 if (li < source_address_length) {
1290 ND_PRINT((ndo, ", bad ish/li"));
1291 return;
1292 }
1293 ND_PRINT((ndo, "\n\t NET (length: %u): %s", source_address_length, isonsap_string(ndo, pptr, source_address_length)));
1294 pptr += source_address_length;
1295 li -= source_address_length;
1296 break;
1297 }
1298
1299 default:
1300 if (ndo->ndo_vflag <= 1) {
1301 if (pptr < ndo->ndo_snapend)
1302 print_unknown_data(ndo, pptr, "\n\t ", ndo->ndo_snapend - pptr);
1303 }
1304 return;
1305 }
1306
1307 /* now walk the options */
1308 while (li != 0) {
1309 u_int op, opli;
1310 const uint8_t *tptr;
1311
1312 if (li < 2) {
1313 ND_PRINT((ndo, ", bad opts/li"));
1314 return;
1315 }
1316 ND_TCHECK_2(pptr);
1317 op = EXTRACT_U_1(pptr);
1318 opli = EXTRACT_U_1(pptr + 1);
1319 pptr += 2;
1320 li -= 2;
1321 if (opli > li) {
1322 ND_PRINT((ndo, ", opt (%d) too long", op));
1323 return;
1324 }
1325 li -= opli;
1326 tptr = pptr;
1327
1328 ND_PRINT((ndo, "\n\t %s Option #%u, length %u, value: ",
1329 tok2str(esis_option_values,"Unknown",op),
1330 op,
1331 opli));
1332
1333 switch (op) {
1334
1335 case ESIS_OPTION_ES_CONF_TIME:
1336 if (opli == 2) {
1337 ND_TCHECK_2(pptr);
1338 ND_PRINT((ndo, "%us", EXTRACT_BE_U_2(tptr)));
1339 } else
1340 ND_PRINT((ndo, "(bad length)"));
1341 break;
1342
1343 case ESIS_OPTION_PROTOCOLS:
1344 while (opli>0) {
1345 ND_TCHECK_1(tptr);
1346 ND_PRINT((ndo, "%s (0x%02x)",
1347 tok2str(nlpid_values,
1348 "unknown",
1349 EXTRACT_U_1(tptr)),
1350 EXTRACT_U_1(tptr)));
1351 if (opli>1) /* further NPLIDs ? - put comma */
1352 ND_PRINT((ndo, ", "));
1353 tptr++;
1354 opli--;
1355 }
1356 break;
1357
1358 /*
1359 * FIXME those are the defined Options that lack a decoder
1360 * you are welcome to contribute code ;-)
1361 */
1362
1363 case ESIS_OPTION_QOS_MAINTENANCE:
1364 case ESIS_OPTION_SECURITY:
1365 case ESIS_OPTION_PRIORITY:
1366 case ESIS_OPTION_ADDRESS_MASK:
1367 case ESIS_OPTION_SNPA_MASK:
1368
1369 default:
1370 print_unknown_data(ndo, tptr, "\n\t ", opli);
1371 break;
1372 }
1373 if (ndo->ndo_vflag > 1)
1374 print_unknown_data(ndo, pptr, "\n\t ", opli);
1375 pptr += opli;
1376 }
1377 trunc:
1378 ND_PRINT((ndo, "[|esis]"));
1379 }
1380
1381 static void
1382 isis_print_mcid(netdissect_options *ndo,
1383 const struct isis_spb_mcid *mcid)
1384 {
1385 int i;
1386
1387 ND_TCHECK(*mcid);
1388 ND_PRINT((ndo, "ID: %d, Name: ", mcid->format_id));
1389
1390 if (fn_printzp(ndo, mcid->name, 32, ndo->ndo_snapend))
1391 goto trunc;
1392
1393 ND_PRINT((ndo, "\n\t Lvl: %d", EXTRACT_BE_U_2(mcid->revision_lvl)));
1394
1395 ND_PRINT((ndo, ", Digest: "));
1396
1397 for(i=0;i<16;i++)
1398 ND_PRINT((ndo, "%.2x ", mcid->digest[i]));
1399
1400 trunc:
1401 ND_PRINT((ndo, "%s", tstr));
1402 }
1403
1404 static int
1405 isis_print_mt_port_cap_subtlv(netdissect_options *ndo,
1406 const uint8_t *tptr, int len)
1407 {
1408 int stlv_type, stlv_len;
1409 const struct isis_subtlv_spb_mcid *subtlv_spb_mcid;
1410 int i;
1411
1412 while (len > 2)
1413 {
1414 ND_TCHECK_2(tptr);
1415 stlv_type = EXTRACT_U_1(tptr);
1416 stlv_len = EXTRACT_U_1(tptr + 1);
1417
1418 /* first lets see if we know the subTLVs name*/
1419 ND_PRINT((ndo, "\n\t %s subTLV #%u, length: %u",
1420 tok2str(isis_mt_port_cap_subtlv_values, "unknown", stlv_type),
1421 stlv_type,
1422 stlv_len));
1423
1424 tptr = tptr + 2;
1425 /*len -= TLV_TYPE_LEN_OFFSET;*/
1426 len = len - 2;
1427
1428 /* Make sure the subTLV fits within the space left */
1429 if (len < stlv_len)
1430 goto trunc;
1431 /* Make sure the entire subTLV is in the captured data */
1432 ND_TCHECK2(*(tptr), stlv_len);
1433
1434 switch (stlv_type)
1435 {
1436 case ISIS_SUBTLV_SPB_MCID:
1437 {
1438 if (stlv_len < ISIS_SUBTLV_SPB_MCID_MIN_LEN)
1439 goto trunc;
1440
1441 subtlv_spb_mcid = (const struct isis_subtlv_spb_mcid *)tptr;
1442
1443 ND_PRINT((ndo, "\n\t MCID: "));
1444 isis_print_mcid(ndo, &(subtlv_spb_mcid->mcid));
1445
1446 /*tptr += SPB_MCID_MIN_LEN;
1447 len -= SPB_MCID_MIN_LEN; */
1448
1449 ND_PRINT((ndo, "\n\t AUX-MCID: "));
1450 isis_print_mcid(ndo, &(subtlv_spb_mcid->aux_mcid));
1451
1452 /*tptr += SPB_MCID_MIN_LEN;
1453 len -= SPB_MCID_MIN_LEN; */
1454 tptr = tptr + ISIS_SUBTLV_SPB_MCID_MIN_LEN;
1455 len = len - ISIS_SUBTLV_SPB_MCID_MIN_LEN;
1456 stlv_len = stlv_len - ISIS_SUBTLV_SPB_MCID_MIN_LEN;
1457
1458 break;
1459 }
1460
1461 case ISIS_SUBTLV_SPB_DIGEST:
1462 {
1463 if (stlv_len < ISIS_SUBTLV_SPB_DIGEST_MIN_LEN)
1464 goto trunc;
1465
1466 ND_PRINT((ndo, "\n\t RES: %d V: %d A: %d D: %d",
1467 (EXTRACT_U_1(tptr) >> 5),
1468 ((EXTRACT_U_1(tptr) >> 4) & 0x01),
1469 ((EXTRACT_U_1(tptr) >> 2) & 0x03),
1470 (EXTRACT_U_1(tptr) & 0x03)));
1471
1472 tptr++;
1473
1474 ND_PRINT((ndo, "\n\t Digest: "));
1475
1476 for(i=1;i<=8; i++)
1477 {
1478 ND_PRINT((ndo, "%08x ", EXTRACT_BE_U_4(tptr)));
1479 if (i%4 == 0 && i != 8)
1480 ND_PRINT((ndo, "\n\t "));
1481 tptr = tptr + 4;
1482 }
1483
1484 len = len - ISIS_SUBTLV_SPB_DIGEST_MIN_LEN;
1485 stlv_len = stlv_len - ISIS_SUBTLV_SPB_DIGEST_MIN_LEN;
1486
1487 break;
1488 }
1489
1490 case ISIS_SUBTLV_SPB_BVID:
1491 {
1492 while (stlv_len >= ISIS_SUBTLV_SPB_BVID_MIN_LEN)
1493 {
1494 ND_PRINT((ndo, "\n\t ECT: %08x",
1495 EXTRACT_BE_U_4(tptr)));
1496
1497 tptr = tptr+4;
1498
1499 ND_PRINT((ndo, " BVID: %d, U:%01x M:%01x ",
1500 (EXTRACT_BE_U_2(tptr) >> 4) ,
1501 (EXTRACT_BE_U_2(tptr) >> 3) & 0x01,
1502 (EXTRACT_BE_U_2(tptr) >> 2) & 0x01));
1503
1504 tptr = tptr + 2;
1505 len = len - ISIS_SUBTLV_SPB_BVID_MIN_LEN;
1506 stlv_len = stlv_len - ISIS_SUBTLV_SPB_BVID_MIN_LEN;
1507 }
1508
1509 break;
1510 }
1511
1512 default:
1513 break;
1514 }
1515 tptr += stlv_len;
1516 len -= stlv_len;
1517 }
1518
1519 return 0;
1520
1521 trunc:
1522 ND_PRINT((ndo, "\n\t\t"));
1523 ND_PRINT((ndo, "%s", tstr));
1524 return(1);
1525 }
1526
1527 static int
1528 isis_print_mt_capability_subtlv(netdissect_options *ndo,
1529 const uint8_t *tptr, int len)
1530 {
1531 int stlv_type, stlv_len, tmp;
1532
1533 while (len > 2)
1534 {
1535 ND_TCHECK_2(tptr);
1536 stlv_type = EXTRACT_U_1(tptr);
1537 stlv_len = EXTRACT_U_1(tptr + 1);
1538 tptr = tptr + 2;
1539 len = len - 2;
1540
1541 /* first lets see if we know the subTLVs name*/
1542 ND_PRINT((ndo, "\n\t %s subTLV #%u, length: %u",
1543 tok2str(isis_mt_capability_subtlv_values, "unknown", stlv_type),
1544 stlv_type,
1545 stlv_len));
1546
1547 /* Make sure the subTLV fits within the space left */
1548 if (len < stlv_len)
1549 goto trunc;
1550 /* Make sure the entire subTLV is in the captured data */
1551 ND_TCHECK2(*(tptr), stlv_len);
1552
1553 switch (stlv_type)
1554 {
1555 case ISIS_SUBTLV_SPB_INSTANCE:
1556 if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN)
1557 goto trunc;
1558
1559 ND_PRINT((ndo, "\n\t CIST Root-ID: %08x", EXTRACT_BE_U_4(tptr)));
1560 tptr = tptr+4;
1561 ND_PRINT((ndo, " %08x", EXTRACT_BE_U_4(tptr)));
1562 tptr = tptr+4;
1563 ND_PRINT((ndo, ", Path Cost: %08x", EXTRACT_BE_U_4(tptr)));
1564 tptr = tptr+4;
1565 ND_PRINT((ndo, ", Prio: %d", EXTRACT_BE_U_2(tptr)));
1566 tptr = tptr + 2;
1567 ND_PRINT((ndo, "\n\t RES: %d",
1568 EXTRACT_BE_U_2(tptr) >> 5));
1569 ND_PRINT((ndo, ", V: %d",
1570 (EXTRACT_BE_U_2(tptr) >> 4) & 0x0001));
1571 ND_PRINT((ndo, ", SPSource-ID: %d",
1572 (EXTRACT_BE_U_4(tptr) & 0x000fffff)));
1573 tptr = tptr+4;
1574 ND_PRINT((ndo, ", No of Trees: %x", EXTRACT_U_1(tptr)));
1575
1576 tmp = EXTRACT_U_1(tptr);
1577 tptr++;
1578
1579 len = len - ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN;
1580 stlv_len = stlv_len - ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN;
1581
1582 while (tmp)
1583 {
1584 if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN)
1585 goto trunc;
1586
1587 ND_PRINT((ndo, "\n\t U:%d, M:%d, A:%d, RES:%d",
1588 EXTRACT_U_1(tptr) >> 7,
1589 (EXTRACT_U_1(tptr) >> 6) & 0x01,
1590 (EXTRACT_U_1(tptr) >> 5) & 0x01,
1591 (EXTRACT_U_1(tptr) & 0x1f)));
1592
1593 tptr++;
1594
1595 ND_PRINT((ndo, ", ECT: %08x", EXTRACT_BE_U_4(tptr)));
1596
1597 tptr = tptr + 4;
1598
1599 ND_PRINT((ndo, ", BVID: %d, SPVID: %d",
1600 (EXTRACT_BE_U_3(tptr) >> 12) & 0x000fff,
1601 EXTRACT_BE_U_3(tptr) & 0x000fff));
1602
1603 tptr = tptr + 3;
1604 len = len - ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN;
1605 stlv_len = stlv_len - ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN;
1606 tmp--;
1607 }
1608
1609 break;
1610
1611 case ISIS_SUBTLV_SPBM_SI:
1612 if (stlv_len < 8)
1613 goto trunc;
1614
1615 ND_PRINT((ndo, "\n\t BMAC: %08x", EXTRACT_BE_U_4(tptr)));
1616 tptr = tptr+4;
1617 ND_PRINT((ndo, "%04x", EXTRACT_BE_U_2(tptr)));
1618 tptr = tptr+2;
1619
1620 ND_PRINT((ndo, ", RES: %d, VID: %d", EXTRACT_BE_U_2(tptr) >> 12,
1621 (EXTRACT_BE_U_2(tptr)) & 0x0fff));
1622
1623 tptr = tptr+2;
1624 len = len - 8;
1625 stlv_len = stlv_len - 8;
1626
1627 while (stlv_len >= 4) {
1628 ND_TCHECK_4(tptr);
1629 ND_PRINT((ndo, "\n\t T: %d, R: %d, RES: %d, ISID: %d",
1630 (EXTRACT_BE_U_4(tptr) >> 31),
1631 (EXTRACT_BE_U_4(tptr) >> 30) & 0x01,
1632 (EXTRACT_BE_U_4(tptr) >> 24) & 0x03f,
1633 (EXTRACT_BE_U_4(tptr)) & 0x0ffffff));
1634
1635 tptr = tptr + 4;
1636 len = len - 4;
1637 stlv_len = stlv_len - 4;
1638 }
1639
1640 break;
1641
1642 default:
1643 break;
1644 }
1645 tptr += stlv_len;
1646 len -= stlv_len;
1647 }
1648 return 0;
1649
1650 trunc:
1651 ND_PRINT((ndo, "\n\t\t"));
1652 ND_PRINT((ndo, "%s", tstr));
1653 return(1);
1654 }
1655
1656 /* shared routine for printing system, node and lsp-ids */
1657 static char *
1658 isis_print_id(const uint8_t *cp, int id_len)
1659 {
1660 int i;
1661 static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")];
1662 char *pos = id;
1663 int sysid_len;
1664
1665 sysid_len = SYSTEM_ID_LEN;
1666 if (sysid_len > id_len)
1667 sysid_len = id_len;
1668 for (i = 1; i <= sysid_len; i++) {
1669 snprintf(pos, sizeof(id) - (pos - id), "%02x", *cp++);
1670 pos += strlen(pos);
1671 if (i == 2 || i == 4)
1672 *pos++ = '.';
1673 }
1674 if (id_len >= NODE_ID_LEN) {
1675 snprintf(pos, sizeof(id) - (pos - id), ".%02x", *cp++);
1676 pos += strlen(pos);
1677 }
1678 if (id_len == LSP_ID_LEN)
1679 snprintf(pos, sizeof(id) - (pos - id), "-%02x", *cp);
1680 return (id);
1681 }
1682
1683 /* print the 4-byte metric block which is common found in the old-style TLVs */
1684 static int
1685 isis_print_metric_block(netdissect_options *ndo,
1686 const struct isis_metric_block *isis_metric_block)
1687 {
1688 ND_PRINT((ndo, ", Default Metric: %d, %s",
1689 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default),
1690 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal"));
1691 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay))
1692 ND_PRINT((ndo, "\n\t\t Delay Metric: %d, %s",
1693 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay),
1694 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal"));
1695 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense))
1696 ND_PRINT((ndo, "\n\t\t Expense Metric: %d, %s",
1697 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense),
1698 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal"));
1699 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error))
1700 ND_PRINT((ndo, "\n\t\t Error Metric: %d, %s",
1701 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error),
1702 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal"));
1703
1704 return(1); /* everything is ok */
1705 }
1706
1707 static int
1708 isis_print_tlv_ip_reach(netdissect_options *ndo,
1709 const uint8_t *cp, const char *ident, int length)
1710 {
1711 int prefix_len;
1712 const struct isis_tlv_ip_reach *tlv_ip_reach;
1713
1714 tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp;
1715
1716 while (length > 0) {
1717 if ((size_t)length < sizeof(*tlv_ip_reach)) {
1718 ND_PRINT((ndo, "short IPv4 Reachability (%d vs %lu)",
1719 length,
1720 (unsigned long)sizeof(*tlv_ip_reach)));
1721 return (0);
1722 }
1723
1724 if (!ND_TTEST(*tlv_ip_reach))
1725 return (0);
1726
1727 prefix_len = mask2plen(EXTRACT_BE_U_4(tlv_ip_reach->mask));
1728
1729 if (prefix_len == -1)
1730 ND_PRINT((ndo, "%sIPv4 prefix: %s mask %s",
1731 ident,
1732 ipaddr_string(ndo, (tlv_ip_reach->prefix)),
1733 ipaddr_string(ndo, (tlv_ip_reach->mask))));
1734 else
1735 ND_PRINT((ndo, "%sIPv4 prefix: %15s/%u",
1736 ident,
1737 ipaddr_string(ndo, (tlv_ip_reach->prefix)),
1738 prefix_len));
1739
1740 ND_PRINT((ndo, ", Distribution: %s, Metric: %u, %s",
1741 ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up",
1742 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default),
1743 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal"));
1744
1745 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay))
1746 ND_PRINT((ndo, "%s Delay Metric: %u, %s",
1747 ident,
1748 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay),
1749 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal"));
1750
1751 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense))
1752 ND_PRINT((ndo, "%s Expense Metric: %u, %s",
1753 ident,
1754 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense),
1755 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal"));
1756
1757 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error))
1758 ND_PRINT((ndo, "%s Error Metric: %u, %s",
1759 ident,
1760 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error),
1761 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal"));
1762
1763 length -= sizeof(struct isis_tlv_ip_reach);
1764 tlv_ip_reach++;
1765 }
1766 return (1);
1767 }
1768
1769 /*
1770 * this is the common IP-REACH subTLV decoder it is called
1771 * from various EXTD-IP REACH TLVs (135,235,236,237)
1772 */
1773
1774 static int
1775 isis_print_ip_reach_subtlv(netdissect_options *ndo,
1776 const uint8_t *tptr, int subt, int subl,
1777 const char *ident)
1778 {
1779 /* first lets see if we know the subTLVs name*/
1780 ND_PRINT((ndo, "%s%s subTLV #%u, length: %u",
1781 ident, tok2str(isis_ext_ip_reach_subtlv_values, "unknown", subt),
1782 subt, subl));
1783
1784 ND_TCHECK2(*tptr,subl);
1785
1786 switch(subt) {
1787 case ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR: /* fall through */
1788 case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32:
1789 while (subl >= 4) {
1790 ND_PRINT((ndo, ", 0x%08x (=%u)",
1791 EXTRACT_BE_U_4(tptr),
1792 EXTRACT_BE_U_4(tptr)));
1793 tptr+=4;
1794 subl-=4;
1795 }
1796 break;
1797 case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64:
1798 while (subl >= 8) {
1799 ND_PRINT((ndo, ", 0x%08x%08x",
1800 EXTRACT_BE_U_4(tptr),
1801 EXTRACT_BE_U_4(tptr + 4)));
1802 tptr+=8;
1803 subl-=8;
1804 }
1805 break;
1806 default:
1807 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl))
1808 return(0);
1809 break;
1810 }
1811 return(1);
1812
1813 trunc:
1814 ND_PRINT((ndo, "%s", ident));
1815 ND_PRINT((ndo, "%s", tstr));
1816 return(0);
1817 }
1818
1819 /*
1820 * this is the common IS-REACH subTLV decoder it is called
1821 * from isis_print_ext_is_reach()
1822 */
1823
1824 static int
1825 isis_print_is_reach_subtlv(netdissect_options *ndo,
1826 const uint8_t *tptr, u_int subt, u_int subl,
1827 const char *ident)
1828 {
1829 u_int te_class,priority_level,gmpls_switch_cap;
1830 union { /* int to float conversion buffer for several subTLVs */
1831 float f;
1832 uint32_t i;
1833 } bw;
1834
1835 /* first lets see if we know the subTLVs name*/
1836 ND_PRINT((ndo, "%s%s subTLV #%u, length: %u",
1837 ident, tok2str(isis_ext_is_reach_subtlv_values, "unknown", subt),
1838 subt, subl));
1839
1840 ND_TCHECK2(*tptr, subl);
1841
1842 switch(subt) {
1843 case ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP:
1844 case ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID:
1845 case ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
1846 if (subl >= 4) {
1847 ND_PRINT((ndo, ", 0x%08x", EXTRACT_BE_U_4(tptr)));
1848 if (subl == 8) /* rfc4205 */
1849 ND_PRINT((ndo, ", 0x%08x", EXTRACT_BE_U_4(tptr + 4)));
1850 }
1851 break;
1852 case ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
1853 case ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
1854 if (subl >= sizeof(struct in_addr))
1855 ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr)));
1856 break;
1857 case ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
1858 case ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW:
1859 if (subl >= 4) {
1860 bw.i = EXTRACT_BE_U_4(tptr);
1861 ND_PRINT((ndo, ", %.3f Mbps", bw.f * 8 / 1000000));
1862 }
1863 break;
1864 case ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
1865 if (subl >= 32) {
1866 for (te_class = 0; te_class < 8; te_class++) {
1867 bw.i = EXTRACT_BE_U_4(tptr);
1868 ND_PRINT((ndo, "%s TE-Class %u: %.3f Mbps",
1869 ident,
1870 te_class,
1871 bw.f * 8 / 1000000));
1872 tptr+=4;
1873 }
1874 }
1875 break;
1876 case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS: /* fall through */
1877 case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD:
1878 if (subl == 0)
1879 break;
1880 ND_PRINT((ndo, "%sBandwidth Constraints Model ID: %s (%u)",
1881 ident,
1882 tok2str(diffserv_te_bc_values, "unknown", EXTRACT_U_1(tptr)),
1883 EXTRACT_U_1(tptr)));
1884 tptr++;
1885 /* decode BCs until the subTLV ends */
1886 for (te_class = 0; te_class < (subl-1)/4; te_class++) {
1887 bw.i = EXTRACT_BE_U_4(tptr);
1888 ND_PRINT((ndo, "%s Bandwidth constraint CT%u: %.3f Mbps",
1889 ident,
1890 te_class,
1891 bw.f * 8 / 1000000));
1892 tptr+=4;
1893 }
1894 break;
1895 case ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC:
1896 if (subl >= 3)
1897 ND_PRINT((ndo, ", %u", EXTRACT_BE_U_3(tptr)));
1898 break;
1899 case ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE:
1900 if (subl == 2) {
1901 ND_PRINT((ndo, ", [ %s ] (0x%04x)",
1902 bittok2str(isis_subtlv_link_attribute_values,
1903 "Unknown",
1904 EXTRACT_BE_U_2(tptr)),
1905 EXTRACT_BE_U_2(tptr)));
1906 }
1907 break;
1908 case ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
1909 if (subl >= 2) {
1910 ND_PRINT((ndo, ", %s, Priority %u",
1911 bittok2str(gmpls_link_prot_values, "none", EXTRACT_U_1(tptr)),
1912 EXTRACT_U_1(tptr + 1)));
1913 }
1914 break;
1915 case ISIS_SUBTLV_SPB_METRIC:
1916 if (subl >= 6) {
1917 ND_PRINT((ndo, ", LM: %u", EXTRACT_BE_U_3(tptr)));
1918 tptr=tptr+3;
1919 ND_PRINT((ndo, ", P: %u", EXTRACT_U_1(tptr)));
1920 tptr++;
1921 ND_PRINT((ndo, ", P-ID: %u", EXTRACT_BE_U_2(tptr)));
1922 }
1923 break;
1924 case ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
1925 if (subl >= 36) {
1926 gmpls_switch_cap = EXTRACT_U_1(tptr);
1927 ND_PRINT((ndo, "%s Interface Switching Capability:%s",
1928 ident,
1929 tok2str(gmpls_switch_cap_values, "Unknown", gmpls_switch_cap)));
1930 ND_PRINT((ndo, ", LSP Encoding: %s",
1931 tok2str(gmpls_encoding_values, "Unknown", EXTRACT_U_1((tptr + 1)))));
1932 tptr+=4;
1933 ND_PRINT((ndo, "%s Max LSP Bandwidth:", ident));
1934 for (priority_level = 0; priority_level < 8; priority_level++) {
1935 bw.i = EXTRACT_BE_U_4(tptr);
1936 ND_PRINT((ndo, "%s priority level %d: %.3f Mbps",
1937 ident,
1938 priority_level,
1939 bw.f * 8 / 1000000));
1940 tptr+=4;
1941 }
1942 subl-=36;
1943 switch (gmpls_switch_cap) {
1944 case GMPLS_PSC1:
1945 case GMPLS_PSC2:
1946 case GMPLS_PSC3:
1947 case GMPLS_PSC4:
1948 if (subl < 6)
1949 break;
1950 bw.i = EXTRACT_BE_U_4(tptr);
1951 ND_PRINT((ndo, "%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f * 8 / 1000000));
1952 ND_PRINT((ndo, "%s Interface MTU: %u", ident, EXTRACT_BE_U_2(tptr + 4)));
1953 break;
1954 case GMPLS_TSC:
1955 if (subl < 8)
1956 break;
1957 bw.i = EXTRACT_BE_U_4(tptr);
1958 ND_PRINT((ndo, "%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f * 8 / 1000000));
1959 ND_PRINT((ndo, "%s Indication %s", ident,
1960 tok2str(gmpls_switch_cap_tsc_indication_values, "Unknown (%u)", EXTRACT_U_1((tptr + 4)))));
1961 break;
1962 default:
1963 /* there is some optional stuff left to decode but this is as of yet
1964 not specified so just lets hexdump what is left */
1965 if(subl>0){
1966 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl))
1967 return(0);
1968 }
1969 }
1970 }
1971 break;
1972 default:
1973 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl))
1974 return(0);
1975 break;
1976 }
1977 return(1);
1978
1979 trunc:
1980 return(0);
1981 }
1982
1983 /*
1984 * this is the common IS-REACH decoder it is called
1985 * from various EXTD-IS REACH style TLVs (22,24,222)
1986 */
1987
1988 static int
1989 isis_print_ext_is_reach(netdissect_options *ndo,
1990 const uint8_t *tptr, const char *ident, int tlv_type)
1991 {
1992 char ident_buffer[20];
1993 int subtlv_type,subtlv_len,subtlv_sum_len;
1994 int proc_bytes = 0; /* how many bytes did we process ? */
1995
1996 if (!ND_TTEST2(*tptr, NODE_ID_LEN))
1997 return(0);
1998
1999 ND_PRINT((ndo, "%sIS Neighbor: %s", ident, isis_print_id(tptr, NODE_ID_LEN)));
2000 tptr+=NODE_ID_LEN;
2001
2002 if (tlv_type != ISIS_TLV_IS_ALIAS_ID) { /* the Alias TLV Metric field is implicit 0 */
2003 if (!ND_TTEST_3(tptr)) /* and is therefore skipped */
2004 return(0);
2005 ND_PRINT((ndo, ", Metric: %d", EXTRACT_BE_U_3(tptr)));
2006 tptr+=3;
2007 }
2008
2009 if (!ND_TTEST_1(tptr))
2010 return(0);
2011 subtlv_sum_len=EXTRACT_U_1(tptr); /* read out subTLV length */
2012 tptr++;
2013 proc_bytes=NODE_ID_LEN+3+1;
2014 ND_PRINT((ndo, ", %ssub-TLVs present",subtlv_sum_len ? "" : "no "));
2015 if (subtlv_sum_len) {
2016 ND_PRINT((ndo, " (%u)", subtlv_sum_len));
2017 while (subtlv_sum_len>0) {
2018 if (!ND_TTEST_2(tptr))
2019 return(0);
2020 subtlv_type=EXTRACT_U_1(tptr);
2021 subtlv_len=EXTRACT_U_1(tptr + 1);
2022 tptr+=2;
2023 /* prepend the indent string */
2024 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident);
2025 if (!isis_print_is_reach_subtlv(ndo, tptr, subtlv_type, subtlv_len, ident_buffer))
2026 return(0);
2027 tptr+=subtlv_len;
2028 subtlv_sum_len-=(subtlv_len+2);
2029 proc_bytes+=(subtlv_len+2);
2030 }
2031 }
2032 return(proc_bytes);
2033 }
2034
2035 /*
2036 * this is the common Multi Topology ID decoder
2037 * it is called from various MT-TLVs (222,229,235,237)
2038 */
2039
2040 static int
2041 isis_print_mtid(netdissect_options *ndo,
2042 const uint8_t *tptr, const char *ident)
2043 {
2044 if (!ND_TTEST_2(tptr))
2045 return(0);
2046
2047 ND_PRINT((ndo, "%s%s",
2048 ident,
2049 tok2str(isis_mt_values,
2050 "Reserved for IETF Consensus",
2051 ISIS_MASK_MTID(EXTRACT_BE_U_2(tptr)))));
2052
2053 ND_PRINT((ndo, " Topology (0x%03x), Flags: [%s]",
2054 ISIS_MASK_MTID(EXTRACT_BE_U_2(tptr)),
2055 bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(EXTRACT_BE_U_2(tptr)))));
2056
2057 return(2);
2058 }
2059
2060 /*
2061 * this is the common extended IP reach decoder
2062 * it is called from TLVs (135,235,236,237)
2063 * we process the TLV and optional subTLVs and return
2064 * the amount of processed bytes
2065 */
2066
2067 static int
2068 isis_print_extd_ip_reach(netdissect_options *ndo,
2069 const uint8_t *tptr, const char *ident, uint16_t afi)
2070 {
2071 char ident_buffer[20];
2072 uint8_t prefix[sizeof(struct in6_addr)]; /* shared copy buffer for IPv4 and IPv6 prefixes */
2073 u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen;
2074
2075 if (!ND_TTEST_4(tptr))
2076 return (0);
2077 metric = EXTRACT_BE_U_4(tptr);
2078 processed=4;
2079 tptr+=4;
2080
2081 if (afi == AF_INET) {
2082 if (!ND_TTEST_1(tptr)) /* fetch status byte */
2083 return (0);
2084 status_byte=EXTRACT_U_1(tptr);
2085 tptr++;
2086 bit_length = status_byte&0x3f;
2087 if (bit_length > 32) {
2088 ND_PRINT((ndo, "%sIPv4 prefix: bad bit length %u",
2089 ident,
2090 bit_length));
2091 return (0);
2092 }
2093 processed++;
2094 } else if (afi == AF_INET6) {
2095 if (!ND_TTEST_2(tptr)) /* fetch status & prefix_len byte */
2096 return (0);
2097 status_byte=EXTRACT_U_1(tptr);
2098 bit_length=EXTRACT_U_1(tptr + 1);
2099 if (bit_length > 128) {
2100 ND_PRINT((ndo, "%sIPv6 prefix: bad bit length %u",
2101 ident,
2102 bit_length));
2103 return (0);
2104 }
2105 tptr+=2;
2106 processed+=2;
2107 } else
2108 return (0); /* somebody is fooling us */
2109
2110 byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
2111
2112 if (!ND_TTEST2(*tptr, byte_length))
2113 return (0);
2114 memset(prefix, 0, sizeof prefix); /* clear the copy buffer */
2115 memcpy(prefix,tptr,byte_length); /* copy as much as is stored in the TLV */
2116 tptr+=byte_length;
2117 processed+=byte_length;
2118
2119 if (afi == AF_INET)
2120 ND_PRINT((ndo, "%sIPv4 prefix: %15s/%u",
2121 ident,
2122 ipaddr_string(ndo, prefix),
2123 bit_length));
2124 else if (afi == AF_INET6)
2125 ND_PRINT((ndo, "%sIPv6 prefix: %s/%u",
2126 ident,
2127 ip6addr_string(ndo, prefix),
2128 bit_length));
2129
2130 ND_PRINT((ndo, ", Distribution: %s, Metric: %u",
2131 ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up",
2132 metric));
2133
2134 if (afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
2135 ND_PRINT((ndo, ", sub-TLVs present"));
2136 else if (afi == AF_INET6)
2137 ND_PRINT((ndo, ", %s%s",
2138 ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal",
2139 ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : ""));
2140
2141 if ((afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
2142 || (afi == AF_INET6 && ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte))
2143 ) {
2144 /* assume that one prefix can hold more
2145 than one subTLV - therefore the first byte must reflect
2146 the aggregate bytecount of the subTLVs for this prefix
2147 */
2148 if (!ND_TTEST_1(tptr))
2149 return (0);
2150 sublen=EXTRACT_U_1(tptr);
2151 tptr++;
2152 processed+=sublen+1;
2153 ND_PRINT((ndo, " (%u)", sublen)); /* print out subTLV length */
2154
2155 while (sublen>0) {
2156 if (!ND_TTEST_2(tptr))
2157 return (0);
2158 subtlvtype=EXTRACT_U_1(tptr);
2159 subtlvlen=EXTRACT_U_1(tptr + 1);
2160 tptr+=2;
2161 /* prepend the indent string */
2162 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident);
2163 if (!isis_print_ip_reach_subtlv(ndo, tptr, subtlvtype, subtlvlen, ident_buffer))
2164 return(0);
2165 tptr+=subtlvlen;
2166 sublen-=(subtlvlen+2);
2167 }
2168 }
2169 return (processed);
2170 }
2171
2172 /*
2173 * Clear checksum and lifetime prior to signature verification.
2174 */
2175 static void
2176 isis_clear_checksum_lifetime(void *header)
2177 {
2178 struct isis_lsp_header *header_lsp = (struct isis_lsp_header *) header;
2179
2180 header_lsp->checksum[0] = 0;
2181 header_lsp->checksum[1] = 0;
2182 header_lsp->remaining_lifetime[0] = 0;
2183 header_lsp->remaining_lifetime[1] = 0;
2184 }
2185
2186 /*
2187 * isis_print
2188 * Decode IS-IS packets. Return 0 on error.
2189 */
2190
2191 static int
2192 isis_print(netdissect_options *ndo,
2193 const uint8_t *p, u_int length)
2194 {
2195 const struct isis_common_header *isis_header;
2196
2197 const struct isis_iih_lan_header *header_iih_lan;
2198 const struct isis_iih_ptp_header *header_iih_ptp;
2199 const struct isis_lsp_header *header_lsp;
2200 const struct isis_csnp_header *header_csnp;
2201 const struct isis_psnp_header *header_psnp;
2202
2203 const struct isis_tlv_lsp *tlv_lsp;
2204 const struct isis_tlv_ptp_adj *tlv_ptp_adj;
2205 const struct isis_tlv_is_reach *tlv_is_reach;
2206 const struct isis_tlv_es_reach *tlv_es_reach;
2207
2208 uint8_t pdu_type, max_area, id_length, tlv_type, tlv_len, tmp, alen, lan_alen, prefix_len;
2209 uint8_t ext_is_len, ext_ip_len, mt_len;
2210 uint8_t isis_subtlv_idrp;
2211 const uint8_t *optr, *pptr, *tptr;
2212 u_short packet_len,pdu_len, key_id;
2213 u_int i,vendor_id;
2214 int sigcheck;
2215
2216 packet_len=length;
2217 optr = p; /* initialize the _o_riginal pointer to the packet start -
2218 need it for parsing the checksum TLV and authentication
2219 TLV verification */
2220 isis_header = (const struct isis_common_header *)p;
2221 ND_TCHECK(*isis_header);
2222 if (length < ISIS_COMMON_HEADER_SIZE)
2223 goto trunc;
2224 pptr = p+(ISIS_COMMON_HEADER_SIZE);
2225 header_iih_lan = (const struct isis_iih_lan_header *)pptr;
2226 header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
2227 header_lsp = (const struct isis_lsp_header *)pptr;
2228 header_csnp = (const struct isis_csnp_header *)pptr;
2229 header_psnp = (const struct isis_psnp_header *)pptr;
2230
2231 if (!ndo->ndo_eflag)
2232 ND_PRINT((ndo, "IS-IS"));
2233
2234 /*
2235 * Sanity checking of the header.
2236 */
2237
2238 if (isis_header->version != ISIS_VERSION) {
2239 ND_PRINT((ndo, "version %d packet not supported", isis_header->version));
2240 return (0);
2241 }
2242
2243 if ((isis_header->id_length != SYSTEM_ID_LEN) && (isis_header->id_length != 0)) {
2244 ND_PRINT((ndo, "system ID length of %d is not supported",
2245 isis_header->id_length));
2246 return (0);
2247 }
2248
2249 if (isis_header->pdu_version != ISIS_VERSION) {
2250 ND_PRINT((ndo, "version %d packet not supported", isis_header->pdu_version));
2251 return (0);
2252 }
2253
2254 if (length < isis_header->fixed_len) {
2255 ND_PRINT((ndo, "fixed header length %u > packet length %u", isis_header->fixed_len, length));
2256 return (0);
2257 }
2258
2259 if (isis_header->fixed_len < ISIS_COMMON_HEADER_SIZE) {
2260 ND_PRINT((ndo, "fixed header length %u < minimum header size %u", isis_header->fixed_len, (u_int)ISIS_COMMON_HEADER_SIZE));
2261 return (0);
2262 }
2263
2264 max_area = isis_header->max_area;
2265 switch(max_area) {
2266 case 0:
2267 max_area = 3; /* silly shit */
2268 break;
2269 case 255:
2270 ND_PRINT((ndo, "bad packet -- 255 areas"));
2271 return (0);
2272 default:
2273 break;
2274 }
2275
2276 id_length = isis_header->id_length;
2277 switch(id_length) {
2278 case 0:
2279 id_length = 6; /* silly shit again */
2280 break;
2281 case 1: /* 1-8 are valid sys-ID lenghts */
2282 case 2:
2283 case 3:
2284 case 4:
2285 case 5:
2286 case 6:
2287 case 7:
2288 case 8:
2289 break;
2290 case 255:
2291 id_length = 0; /* entirely useless */
2292 break;
2293 default:
2294 break;
2295 }
2296
2297 /* toss any non 6-byte sys-ID len PDUs */
2298 if (id_length != 6 ) {
2299 ND_PRINT((ndo, "bad packet -- illegal sys-ID length (%u)", id_length));
2300 return (0);
2301 }
2302
2303 pdu_type=isis_header->pdu_type;
2304
2305 /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/
2306 if (ndo->ndo_vflag == 0) {
2307 ND_PRINT((ndo, "%s%s",
2308 ndo->ndo_eflag ? "" : ", ",
2309 tok2str(isis_pdu_values, "unknown PDU-Type %u", pdu_type)));
2310 } else {
2311 /* ok they seem to want to know everything - lets fully decode it */
2312 ND_PRINT((ndo, "%slength %u", ndo->ndo_eflag ? "" : ", ", length));
2313
2314 ND_PRINT((ndo, "\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)",
2315 tok2str(isis_pdu_values,
2316 "unknown, type %u",
2317 pdu_type),
2318 isis_header->fixed_len,
2319 isis_header->version,
2320 isis_header->pdu_version,
2321 id_length,
2322 isis_header->id_length,
2323 max_area,
2324 isis_header->max_area));
2325
2326 if (ndo->ndo_vflag > 1) {
2327 if (!print_unknown_data(ndo, optr, "\n\t", 8)) /* provide the _o_riginal pointer */
2328 return (0); /* for optionally debugging the common header */
2329 }
2330 }
2331
2332 switch (pdu_type) {
2333
2334 case ISIS_PDU_L1_LAN_IIH:
2335 case ISIS_PDU_L2_LAN_IIH:
2336 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) {
2337 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu",
2338 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)));
2339 return (0);
2340 }
2341 ND_TCHECK(*header_iih_lan);
2342 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)
2343 goto trunc;
2344 if (ndo->ndo_vflag == 0) {
2345 ND_PRINT((ndo, ", src-id %s",
2346 isis_print_id(header_iih_lan->source_id, SYSTEM_ID_LEN)));
2347 ND_PRINT((ndo, ", lan-id %s, prio %u",
2348 isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN),
2349 header_iih_lan->priority));
2350 ND_PRINT((ndo, ", length %u", length));
2351 return (1);
2352 }
2353 pdu_len=EXTRACT_BE_U_2(header_iih_lan->pdu_len);
2354 if (packet_len>pdu_len) {
2355 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2356 length=pdu_len;
2357 }
2358
2359 ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]",
2360 isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN),
2361 EXTRACT_BE_U_2(header_iih_lan->holding_time),
2362 tok2str(isis_iih_circuit_type_values,
2363 "unknown circuit type 0x%02x",
2364 header_iih_lan->circuit_type)));
2365
2366 ND_PRINT((ndo, "\n\t lan-id: %s, Priority: %u, PDU length: %u",
2367 isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN),
2368 (header_iih_lan->priority) & ISIS_LAN_PRIORITY_MASK,
2369 pdu_len));
2370
2371 if (ndo->ndo_vflag > 1) {
2372 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_LAN_HEADER_SIZE))
2373 return (0);
2374 }
2375
2376 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
2377 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
2378 break;
2379
2380 case ISIS_PDU_PTP_IIH:
2381 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) {
2382 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu",
2383 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)));
2384 return (0);
2385 }
2386 ND_TCHECK(*header_iih_ptp);
2387 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)
2388 goto trunc;
2389 if (ndo->ndo_vflag == 0) {
2390 ND_PRINT((ndo, ", src-id %s", isis_print_id(header_iih_ptp->source_id, SYSTEM_ID_LEN)));
2391 ND_PRINT((ndo, ", length %u", length));
2392 return (1);
2393 }
2394 pdu_len=EXTRACT_BE_U_2(header_iih_ptp->pdu_len);
2395 if (packet_len>pdu_len) {
2396 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2397 length=pdu_len;
2398 }
2399
2400 ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]",
2401 isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN),
2402 EXTRACT_BE_U_2(header_iih_ptp->holding_time),
2403 tok2str(isis_iih_circuit_type_values,
2404 "unknown circuit type 0x%02x",
2405 header_iih_ptp->circuit_type)));
2406
2407 ND_PRINT((ndo, "\n\t circuit-id: 0x%02x, PDU length: %u",
2408 header_iih_ptp->circuit_id,
2409 pdu_len));
2410
2411 if (ndo->ndo_vflag > 1) {
2412 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_PTP_HEADER_SIZE))
2413 return (0);
2414 }
2415
2416 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
2417 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
2418 break;
2419
2420 case ISIS_PDU_L1_LSP:
2421 case ISIS_PDU_L2_LSP:
2422 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) {
2423 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu",
2424 isis_header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE));
2425 return (0);
2426 }
2427 ND_TCHECK(*header_lsp);
2428 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)
2429 goto trunc;
2430 if (ndo->ndo_vflag == 0) {
2431 ND_PRINT((ndo, ", lsp-id %s, seq 0x%08x, lifetime %5us",
2432 isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
2433 EXTRACT_BE_U_4(header_lsp->sequence_number),
2434 EXTRACT_BE_U_2(header_lsp->remaining_lifetime)));
2435 ND_PRINT((ndo, ", length %u", length));
2436 return (1);
2437 }
2438 pdu_len=EXTRACT_BE_U_2(header_lsp->pdu_len);
2439 if (packet_len>pdu_len) {
2440 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2441 length=pdu_len;
2442 }
2443
2444 ND_PRINT((ndo, "\n\t lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t chksum: 0x%04x",
2445 isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
2446 EXTRACT_BE_U_4(header_lsp->sequence_number),
2447 EXTRACT_BE_U_2(header_lsp->remaining_lifetime),
2448 EXTRACT_BE_U_2(header_lsp->checksum)));
2449
2450 osi_print_cksum(ndo, (const uint8_t *)header_lsp->lsp_id,
2451 EXTRACT_BE_U_2(header_lsp->checksum),
2452 12, length-12);
2453
2454 ND_PRINT((ndo, ", PDU length: %u, Flags: [ %s",
2455 pdu_len,
2456 ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : ""));
2457
2458 if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) {
2459 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : ""));
2460 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : ""));
2461 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : ""));
2462 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : ""));
2463 ND_PRINT((ndo, "ATT bit set, "));
2464 }
2465 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : ""));
2466 ND_PRINT((ndo, "%s ]", tok2str(isis_lsp_istype_values, "Unknown(0x%x)",
2467 ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock))));
2468
2469 if (ndo->ndo_vflag > 1) {
2470 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_LSP_HEADER_SIZE))
2471 return (0);
2472 }
2473
2474 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
2475 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
2476 break;
2477
2478 case ISIS_PDU_L1_CSNP:
2479 case ISIS_PDU_L2_CSNP:
2480 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) {
2481 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu",
2482 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)));
2483 return (0);
2484 }
2485 ND_TCHECK(*header_csnp);
2486 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)
2487 goto trunc;
2488 if (ndo->ndo_vflag == 0) {
2489 ND_PRINT((ndo, ", src-id %s", isis_print_id(header_csnp->source_id, NODE_ID_LEN)));
2490 ND_PRINT((ndo, ", length %u", length));
2491 return (1);
2492 }
2493 pdu_len=EXTRACT_BE_U_2(header_csnp->pdu_len);
2494 if (packet_len>pdu_len) {
2495 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2496 length=pdu_len;
2497 }
2498
2499 ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u",
2500 isis_print_id(header_csnp->source_id, NODE_ID_LEN),
2501 pdu_len));
2502 ND_PRINT((ndo, "\n\t start lsp-id: %s",
2503 isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN)));
2504 ND_PRINT((ndo, "\n\t end lsp-id: %s",
2505 isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN)));
2506
2507 if (ndo->ndo_vflag > 1) {
2508 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_CSNP_HEADER_SIZE))
2509 return (0);
2510 }
2511
2512 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
2513 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
2514 break;
2515
2516 case ISIS_PDU_L1_PSNP:
2517 case ISIS_PDU_L2_PSNP:
2518 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) {
2519 ND_PRINT((ndo, "- bogus fixed header length %u should be %lu",
2520 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)));
2521 return (0);
2522 }
2523 ND_TCHECK(*header_psnp);
2524 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)
2525 goto trunc;
2526 if (ndo->ndo_vflag == 0) {
2527 ND_PRINT((ndo, ", src-id %s", isis_print_id(header_psnp->source_id, NODE_ID_LEN)));
2528 ND_PRINT((ndo, ", length %u", length));
2529 return (1);
2530 }
2531 pdu_len=EXTRACT_BE_U_2(header_psnp->pdu_len);
2532 if (packet_len>pdu_len) {
2533 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2534 length=pdu_len;
2535 }
2536
2537 ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u",
2538 isis_print_id(header_psnp->source_id, NODE_ID_LEN),
2539 pdu_len));
2540
2541 if (ndo->ndo_vflag > 1) {
2542 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_PSNP_HEADER_SIZE))
2543 return (0);
2544 }
2545
2546 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
2547 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
2548 break;
2549
2550 default:
2551 if (ndo->ndo_vflag == 0) {
2552 ND_PRINT((ndo, ", length %u", length));
2553 return (1);
2554 }
2555 (void)print_unknown_data(ndo, pptr, "\n\t ", length);
2556 return (0);
2557 }
2558
2559 /*
2560 * Now print the TLV's.
2561 */
2562
2563 while (packet_len > 0) {
2564 ND_TCHECK_2(pptr);
2565 if (packet_len < 2)
2566 goto trunc;
2567 tlv_type = EXTRACT_U_1(pptr);
2568 tlv_len = EXTRACT_U_1(pptr + 1);
2569 pptr += 2;
2570 packet_len -= 2;
2571 tmp =tlv_len; /* copy temporary len & pointer to packet data */
2572 tptr = pptr;
2573
2574 /* first lets see if we know the TLVs name*/
2575 ND_PRINT((ndo, "\n\t %s TLV #%u, length: %u",
2576 tok2str(isis_tlv_values,
2577 "unknown",
2578 tlv_type),
2579 tlv_type,
2580 tlv_len));
2581
2582 if (tlv_len == 0) /* something is invalid */
2583 continue;
2584
2585 if (packet_len < tlv_len)
2586 goto trunc;
2587
2588 /* now check if we have a decoder otherwise do a hexdump at the end*/
2589 switch (tlv_type) {
2590 case ISIS_TLV_AREA_ADDR:
2591 ND_TCHECK_1(tptr);
2592 alen = EXTRACT_U_1(tptr);
2593 tptr++;
2594 while (tmp && alen < tmp) {
2595 ND_TCHECK2(*tptr, alen);
2596 ND_PRINT((ndo, "\n\t Area address (length: %u): %s",
2597 alen,
2598 isonsap_string(ndo, tptr, alen)));
2599 tptr += alen;
2600 tmp -= alen + 1;
2601 if (tmp==0) /* if this is the last area address do not attemt a boundary check */
2602 break;
2603 ND_TCHECK_1(tptr);
2604 alen = EXTRACT_U_1(tptr);
2605 tptr++;
2606 }
2607 break;
2608 case ISIS_TLV_ISNEIGH:
2609 while (tmp >= ETHER_ADDR_LEN) {
2610 ND_TCHECK2(*tptr, ETHER_ADDR_LEN);
2611 ND_PRINT((ndo, "\n\t SNPA: %s", isis_print_id(tptr, ETHER_ADDR_LEN)));
2612 tmp -= ETHER_ADDR_LEN;
2613 tptr += ETHER_ADDR_LEN;
2614 }
2615 break;
2616
2617 case ISIS_TLV_ISNEIGH_VARLEN:
2618 if (!ND_TTEST_1(tptr) || tmp < 3) /* min. TLV length */
2619 goto trunctlv;
2620 lan_alen = EXTRACT_U_1(tptr); /* LAN address length */
2621 tptr++;
2622 if (lan_alen == 0) {
2623 ND_PRINT((ndo, "\n\t LAN address length 0 bytes (invalid)"));
2624 break;
2625 }
2626 tmp --;
2627 ND_PRINT((ndo, "\n\t LAN address length %u bytes ", lan_alen));
2628 while (tmp >= lan_alen) {
2629 ND_TCHECK2(*tptr, lan_alen);
2630 ND_PRINT((ndo, "\n\t\tIS Neighbor: %s", isis_print_id(tptr, lan_alen)));
2631 tmp -= lan_alen;
2632 tptr +=lan_alen;
2633 }
2634 break;
2635
2636 case ISIS_TLV_PADDING:
2637 break;
2638
2639 case ISIS_TLV_MT_IS_REACH:
2640 mt_len = isis_print_mtid(ndo, tptr, "\n\t ");
2641 if (mt_len == 0) /* did something go wrong ? */
2642 goto trunctlv;
2643 tptr+=mt_len;
2644 tmp-=mt_len;
2645 while (tmp >= 2+NODE_ID_LEN+3+1) {
2646 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type);
2647 if (ext_is_len == 0) /* did something go wrong ? */
2648 goto trunctlv;
2649
2650 tmp-=ext_is_len;
2651 tptr+=ext_is_len;
2652 }
2653 break;
2654
2655 case ISIS_TLV_IS_ALIAS_ID:
2656 while (tmp >= NODE_ID_LEN+1) { /* is it worth attempting a decode ? */
2657 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type);
2658 if (ext_is_len == 0) /* did something go wrong ? */
2659 goto trunctlv;
2660 tmp-=ext_is_len;
2661 tptr+=ext_is_len;
2662 }
2663 break;
2664
2665 case ISIS_TLV_EXT_IS_REACH:
2666 while (tmp >= NODE_ID_LEN+3+1) { /* is it worth attempting a decode ? */
2667 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type);
2668 if (ext_is_len == 0) /* did something go wrong ? */
2669 goto trunctlv;
2670 tmp-=ext_is_len;
2671 tptr+=ext_is_len;
2672 }
2673 break;
2674 case ISIS_TLV_IS_REACH:
2675 ND_TCHECK_1(tptr); /* check if there is one byte left to read out the virtual flag */
2676 ND_PRINT((ndo, "\n\t %s",
2677 tok2str(isis_is_reach_virtual_values,
2678 "bogus virtual flag 0x%02x",
2679 EXTRACT_U_1(tptr))));
2680 tptr++;
2681 tlv_is_reach = (const struct isis_tlv_is_reach *)tptr;
2682 while (tmp >= sizeof(struct isis_tlv_is_reach)) {
2683 ND_TCHECK(*tlv_is_reach);
2684 ND_PRINT((ndo, "\n\t IS Neighbor: %s",
2685 isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN)));
2686 isis_print_metric_block(ndo, &tlv_is_reach->isis_metric_block);
2687 tmp -= sizeof(struct isis_tlv_is_reach);
2688 tlv_is_reach++;
2689 }
2690 break;
2691
2692 case ISIS_TLV_ESNEIGH:
2693 tlv_es_reach = (const struct isis_tlv_es_reach *)tptr;
2694 while (tmp >= sizeof(struct isis_tlv_es_reach)) {
2695 ND_TCHECK(*tlv_es_reach);
2696 ND_PRINT((ndo, "\n\t ES Neighbor: %s",
2697 isis_print_id(tlv_es_reach->neighbor_sysid, SYSTEM_ID_LEN)));
2698 isis_print_metric_block(ndo, &tlv_es_reach->isis_metric_block);
2699 tmp -= sizeof(struct isis_tlv_es_reach);
2700 tlv_es_reach++;
2701 }
2702 break;
2703
2704 /* those two TLVs share the same format */
2705 case ISIS_TLV_INT_IP_REACH:
2706 case ISIS_TLV_EXT_IP_REACH:
2707 if (!isis_print_tlv_ip_reach(ndo, pptr, "\n\t ", tlv_len))
2708 return (1);
2709 break;
2710
2711 case ISIS_TLV_EXTD_IP_REACH:
2712 while (tmp>0) {
2713 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET);
2714 if (ext_ip_len == 0) /* did something go wrong ? */
2715 goto trunctlv;
2716 tptr+=ext_ip_len;
2717 tmp-=ext_ip_len;
2718 }
2719 break;
2720
2721 case ISIS_TLV_MT_IP_REACH:
2722 mt_len = isis_print_mtid(ndo, tptr, "\n\t ");
2723 if (mt_len == 0) { /* did something go wrong ? */
2724 goto trunctlv;
2725 }
2726 tptr+=mt_len;
2727 tmp-=mt_len;
2728
2729 while (tmp>0) {
2730 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET);
2731 if (ext_ip_len == 0) /* did something go wrong ? */
2732 goto trunctlv;
2733 tptr+=ext_ip_len;
2734 tmp-=ext_ip_len;
2735 }
2736 break;
2737
2738 case ISIS_TLV_IP6_REACH:
2739 while (tmp>0) {
2740 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET6);
2741 if (ext_ip_len == 0) /* did something go wrong ? */
2742 goto trunctlv;
2743 tptr+=ext_ip_len;
2744 tmp-=ext_ip_len;
2745 }
2746 break;
2747
2748 case ISIS_TLV_MT_IP6_REACH:
2749 mt_len = isis_print_mtid(ndo, tptr, "\n\t ");
2750 if (mt_len == 0) { /* did something go wrong ? */
2751 goto trunctlv;
2752 }
2753 tptr+=mt_len;
2754 tmp-=mt_len;
2755
2756 while (tmp>0) {
2757 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET6);
2758 if (ext_ip_len == 0) /* did something go wrong ? */
2759 goto trunctlv;
2760 tptr+=ext_ip_len;
2761 tmp-=ext_ip_len;
2762 }
2763 break;
2764
2765 case ISIS_TLV_IP6ADDR:
2766 while (tmp>=sizeof(struct in6_addr)) {
2767 ND_TCHECK2(*tptr, sizeof(struct in6_addr));
2768
2769 ND_PRINT((ndo, "\n\t IPv6 interface address: %s",
2770 ip6addr_string(ndo, tptr)));
2771
2772 tptr += sizeof(struct in6_addr);
2773 tmp -= sizeof(struct in6_addr);
2774 }
2775 break;
2776 case ISIS_TLV_AUTH:
2777 ND_TCHECK_1(tptr);
2778
2779 ND_PRINT((ndo, "\n\t %s: ",
2780 tok2str(isis_subtlv_auth_values,
2781 "unknown Authentication type 0x%02x",
2782 EXTRACT_U_1(tptr))));
2783
2784 switch (EXTRACT_U_1(tptr)) {
2785 case ISIS_SUBTLV_AUTH_SIMPLE:
2786 if (fn_printzp(ndo, tptr + 1, tlv_len - 1, ndo->ndo_snapend))
2787 goto trunctlv;
2788 break;
2789 case ISIS_SUBTLV_AUTH_MD5:
2790 for(i=1;i<tlv_len;i++) {
2791 ND_TCHECK_1(tptr + i);
2792 ND_PRINT((ndo, "%02x", EXTRACT_U_1(tptr + i)));
2793 }
2794 if (tlv_len != ISIS_SUBTLV_AUTH_MD5_LEN+1)
2795 ND_PRINT((ndo, ", (invalid subTLV) "));
2796
2797 sigcheck = signature_verify(ndo, optr, length, tptr + 1,
2798 isis_clear_checksum_lifetime,
2799 header_lsp);
2800 ND_PRINT((ndo, " (%s)", tok2str(signature_check_values, "Unknown", sigcheck)));
2801
2802 break;
2803 case ISIS_SUBTLV_AUTH_GENERIC:
2804 ND_TCHECK_2(tptr + 1);
2805 key_id = EXTRACT_BE_U_2(tptr + 1);
2806 ND_PRINT((ndo, "%u, password: ", key_id));
2807 for(i=1 + sizeof(uint16_t);i<tlv_len;i++) {
2808 ND_TCHECK_1(tptr + i);
2809 ND_PRINT((ndo, "%02x", EXTRACT_U_1(tptr + i)));
2810 }
2811 break;
2812 case ISIS_SUBTLV_AUTH_PRIVATE:
2813 default:
2814 if (!print_unknown_data(ndo, tptr + 1, "\n\t\t ", tlv_len - 1))
2815 return(0);
2816 break;
2817 }
2818 break;
2819
2820 case ISIS_TLV_PTP_ADJ:
2821 tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr;
2822 if(tmp>=1) {
2823 ND_TCHECK_1(tptr);
2824 ND_PRINT((ndo, "\n\t Adjacency State: %s (%u)",
2825 tok2str(isis_ptp_adjancey_values, "unknown", EXTRACT_U_1(tptr)),
2826 EXTRACT_U_1(tptr)));
2827 tmp--;
2828 }
2829 if(tmp>sizeof(tlv_ptp_adj->extd_local_circuit_id)) {
2830 ND_TCHECK(tlv_ptp_adj->extd_local_circuit_id);
2831 ND_PRINT((ndo, "\n\t Extended Local circuit-ID: 0x%08x",
2832 EXTRACT_BE_U_4(tlv_ptp_adj->extd_local_circuit_id)));
2833 tmp-=sizeof(tlv_ptp_adj->extd_local_circuit_id);
2834 }
2835 if(tmp>=SYSTEM_ID_LEN) {
2836 ND_TCHECK2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN);
2837 ND_PRINT((ndo, "\n\t Neighbor System-ID: %s",
2838 isis_print_id(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN)));
2839 tmp-=SYSTEM_ID_LEN;
2840 }
2841 if(tmp>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) {
2842 ND_TCHECK(tlv_ptp_adj->neighbor_extd_local_circuit_id);
2843 ND_PRINT((ndo, "\n\t Neighbor Extended Local circuit-ID: 0x%08x",
2844 EXTRACT_BE_U_4(tlv_ptp_adj->neighbor_extd_local_circuit_id)));
2845 }
2846 break;
2847
2848 case ISIS_TLV_PROTOCOLS:
2849 ND_PRINT((ndo, "\n\t NLPID(s): "));
2850 while (tmp>0) {
2851 ND_TCHECK_1(tptr);
2852 ND_PRINT((ndo, "%s (0x%02x)",
2853 tok2str(nlpid_values,
2854 "unknown",
2855 EXTRACT_U_1(tptr)),
2856 EXTRACT_U_1(tptr)));
2857 if (tmp>1) /* further NPLIDs ? - put comma */
2858 ND_PRINT((ndo, ", "));
2859 tptr++;
2860 tmp--;
2861 }
2862 break;
2863
2864 case ISIS_TLV_MT_PORT_CAP:
2865 {
2866 ND_TCHECK_2(tptr);
2867
2868 ND_PRINT((ndo, "\n\t RES: %d, MTID(s): %d",
2869 (EXTRACT_BE_U_2(tptr) >> 12),
2870 (EXTRACT_BE_U_2(tptr) & 0x0fff)));
2871
2872 tmp = tmp-2;
2873 tptr = tptr+2;
2874
2875 if (tmp)
2876 isis_print_mt_port_cap_subtlv(ndo, tptr, tmp);
2877
2878 break;
2879 }
2880
2881 case ISIS_TLV_MT_CAPABILITY:
2882
2883 ND_TCHECK_2(tptr);
2884
2885 ND_PRINT((ndo, "\n\t O: %d, RES: %d, MTID(s): %d",
2886 (EXTRACT_BE_U_2(tptr) >> 15) & 0x01,
2887 (EXTRACT_BE_U_2(tptr) >> 12) & 0x07,
2888 EXTRACT_BE_U_2(tptr) & 0x0fff));
2889
2890 tmp = tmp-2;
2891 tptr = tptr+2;
2892
2893 if (tmp)
2894 isis_print_mt_capability_subtlv(ndo, tptr, tmp);
2895
2896 break;
2897
2898 case ISIS_TLV_TE_ROUTER_ID:
2899 ND_TCHECK2(*pptr, sizeof(struct in_addr));
2900 ND_PRINT((ndo, "\n\t Traffic Engineering Router ID: %s", ipaddr_string(ndo, pptr)));
2901 break;
2902
2903 case ISIS_TLV_IPADDR:
2904 while (tmp>=sizeof(struct in_addr)) {
2905 ND_TCHECK2(*tptr, sizeof(struct in_addr));
2906 ND_PRINT((ndo, "\n\t IPv4 interface address: %s", ipaddr_string(ndo, tptr)));
2907 tptr += sizeof(struct in_addr);
2908 tmp -= sizeof(struct in_addr);
2909 }
2910 break;
2911
2912 case ISIS_TLV_HOSTNAME:
2913 ND_PRINT((ndo, "\n\t Hostname: "));
2914 if (fn_printzp(ndo, tptr, tmp, ndo->ndo_snapend))
2915 goto trunctlv;
2916 break;
2917
2918 case ISIS_TLV_SHARED_RISK_GROUP:
2919 if (tmp < NODE_ID_LEN)
2920 break;
2921 ND_TCHECK2(*tptr, NODE_ID_LEN);
2922 ND_PRINT((ndo, "\n\t IS Neighbor: %s", isis_print_id(tptr, NODE_ID_LEN)));
2923 tptr+=NODE_ID_LEN;
2924 tmp-=NODE_ID_LEN;
2925
2926 if (tmp < 1)
2927 break;
2928 ND_TCHECK_1(tptr);
2929 ND_PRINT((ndo, ", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(EXTRACT_U_1(tptr)) ? "numbered" : "unnumbered"));
2930 tptr++;
2931 tmp--;
2932
2933 if (tmp < sizeof(struct in_addr))
2934 break;
2935 ND_TCHECK2(*tptr, sizeof(struct in_addr));
2936 ND_PRINT((ndo, "\n\t IPv4 interface address: %s", ipaddr_string(ndo, tptr)));
2937 tptr+=sizeof(struct in_addr);
2938 tmp-=sizeof(struct in_addr);
2939
2940 if (tmp < sizeof(struct in_addr))
2941 break;
2942 ND_TCHECK2(*tptr, sizeof(struct in_addr));
2943 ND_PRINT((ndo, "\n\t IPv4 neighbor address: %s", ipaddr_string(ndo, tptr)));
2944 tptr+=sizeof(struct in_addr);
2945 tmp-=sizeof(struct in_addr);
2946
2947 while (tmp>=4) {
2948 ND_TCHECK_4(tptr);
2949 ND_PRINT((ndo, "\n\t Link-ID: 0x%08x", EXTRACT_BE_U_4(tptr)));
2950 tptr+=4;
2951 tmp-=4;
2952 }
2953 break;
2954
2955 case ISIS_TLV_LSP:
2956 tlv_lsp = (const struct isis_tlv_lsp *)tptr;
2957 while(tmp>=sizeof(struct isis_tlv_lsp)) {
2958 ND_TCHECK((tlv_lsp->lsp_id)[LSP_ID_LEN-1]);
2959 ND_PRINT((ndo, "\n\t lsp-id: %s",
2960 isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN)));
2961 ND_TCHECK2(tlv_lsp->sequence_number, 4);
2962 ND_PRINT((ndo, ", seq: 0x%08x", EXTRACT_BE_U_4(tlv_lsp->sequence_number)));
2963 ND_TCHECK2(tlv_lsp->remaining_lifetime, 2);
2964 ND_PRINT((ndo, ", lifetime: %5ds", EXTRACT_BE_U_2(tlv_lsp->remaining_lifetime)));
2965 ND_TCHECK2(tlv_lsp->checksum, 2);
2966 ND_PRINT((ndo, ", chksum: 0x%04x", EXTRACT_BE_U_2(tlv_lsp->checksum)));
2967 tmp-=sizeof(struct isis_tlv_lsp);
2968 tlv_lsp++;
2969 }
2970 break;
2971
2972 case ISIS_TLV_CHECKSUM:
2973 if (tmp < ISIS_TLV_CHECKSUM_MINLEN)
2974 break;
2975 ND_TCHECK2(*tptr, ISIS_TLV_CHECKSUM_MINLEN);
2976 ND_PRINT((ndo, "\n\t checksum: 0x%04x ", EXTRACT_BE_U_2(tptr)));
2977 /* do not attempt to verify the checksum if it is zero
2978 * most likely a HMAC-MD5 TLV is also present and
2979 * to avoid conflicts the checksum TLV is zeroed.
2980 * see rfc3358 for details
2981 */
2982 osi_print_cksum(ndo, optr, EXTRACT_BE_U_2(tptr), tptr-optr,
2983 length);
2984 break;
2985
2986 case ISIS_TLV_POI:
2987 if (tlv_len >= SYSTEM_ID_LEN + 1) {
2988 ND_TCHECK2(*tptr, SYSTEM_ID_LEN + 1);
2989 ND_PRINT((ndo, "\n\t Purge Originator System-ID: %s",
2990 isis_print_id(tptr + 1, SYSTEM_ID_LEN)));
2991 }
2992
2993 if (tlv_len == 2 * SYSTEM_ID_LEN + 1) {
2994 ND_TCHECK2(*tptr, 2 * SYSTEM_ID_LEN + 1);
2995 ND_PRINT((ndo, "\n\t Received from System-ID: %s",
2996 isis_print_id(tptr + SYSTEM_ID_LEN + 1, SYSTEM_ID_LEN)));
2997 }
2998 break;
2999
3000 case ISIS_TLV_MT_SUPPORTED:
3001 if (tmp < ISIS_TLV_MT_SUPPORTED_MINLEN)
3002 break;
3003 while (tmp>1) {
3004 /* length can only be a multiple of 2, otherwise there is
3005 something broken -> so decode down until length is 1 */
3006 if (tmp!=1) {
3007 mt_len = isis_print_mtid(ndo, tptr, "\n\t ");
3008 if (mt_len == 0) /* did something go wrong ? */
3009 goto trunctlv;
3010 tptr+=mt_len;
3011 tmp-=mt_len;
3012 } else {
3013 ND_PRINT((ndo, "\n\t invalid MT-ID"));
3014 break;
3015 }
3016 }
3017 break;
3018
3019 case ISIS_TLV_RESTART_SIGNALING:
3020 /* first attempt to decode the flags */
3021 if (tmp < ISIS_TLV_RESTART_SIGNALING_FLAGLEN)
3022 break;
3023 ND_TCHECK2(*tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN);
3024 ND_PRINT((ndo, "\n\t Flags [%s]",
3025 bittok2str(isis_restart_flag_values, "none", EXTRACT_U_1(tptr))));
3026 tptr+=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
3027 tmp-=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
3028
3029 /* is there anything other than the flags field? */
3030 if (tmp == 0)
3031 break;
3032
3033 if (tmp < ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN)
3034 break;
3035 ND_TCHECK2(*tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN);
3036
3037 ND_PRINT((ndo, ", Remaining holding time %us", EXTRACT_BE_U_2(tptr)));
3038 tptr+=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
3039 tmp-=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
3040
3041 /* is there an additional sysid field present ?*/
3042 if (tmp == SYSTEM_ID_LEN) {
3043 ND_TCHECK2(*tptr, SYSTEM_ID_LEN);
3044 ND_PRINT((ndo, ", for %s", isis_print_id(tptr,SYSTEM_ID_LEN)));
3045 }
3046 break;
3047
3048 case ISIS_TLV_IDRP_INFO:
3049 if (tmp < ISIS_TLV_IDRP_INFO_MINLEN)
3050 break;
3051 ND_TCHECK2(*tptr, ISIS_TLV_IDRP_INFO_MINLEN);
3052 ND_PRINT((ndo, "\n\t Inter-Domain Information Type: %s",
3053 tok2str(isis_subtlv_idrp_values,
3054 "Unknown (0x%02x)",
3055 EXTRACT_U_1(tptr))));
3056 isis_subtlv_idrp = EXTRACT_U_1(tptr);
3057 tptr++;
3058 switch (isis_subtlv_idrp) {
3059 case ISIS_SUBTLV_IDRP_ASN:
3060 ND_TCHECK_2(tptr); /* fetch AS number */
3061 ND_PRINT((ndo, "AS Number: %u", EXTRACT_BE_U_2(tptr)));
3062 break;
3063 case ISIS_SUBTLV_IDRP_LOCAL:
3064 case ISIS_SUBTLV_IDRP_RES:
3065 default:
3066 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_len - 1))
3067 return(0);
3068 break;
3069 }
3070 break;
3071
3072 case ISIS_TLV_LSP_BUFFERSIZE:
3073 if (tmp < ISIS_TLV_LSP_BUFFERSIZE_MINLEN)
3074 break;
3075 ND_TCHECK2(*tptr, ISIS_TLV_LSP_BUFFERSIZE_MINLEN);
3076 ND_PRINT((ndo, "\n\t LSP Buffersize: %u", EXTRACT_BE_U_2(tptr)));
3077 break;
3078
3079 case ISIS_TLV_PART_DIS:
3080 while (tmp >= SYSTEM_ID_LEN) {
3081 ND_TCHECK2(*tptr, SYSTEM_ID_LEN);
3082 ND_PRINT((ndo, "\n\t %s", isis_print_id(tptr, SYSTEM_ID_LEN)));
3083 tptr+=SYSTEM_ID_LEN;
3084 tmp-=SYSTEM_ID_LEN;
3085 }
3086 break;
3087
3088 case ISIS_TLV_PREFIX_NEIGH:
3089 if (tmp < sizeof(struct isis_metric_block))
3090 break;
3091 ND_TCHECK2(*tptr, sizeof(struct isis_metric_block));
3092 ND_PRINT((ndo, "\n\t Metric Block"));
3093 isis_print_metric_block(ndo, (const struct isis_metric_block *)tptr);
3094 tptr+=sizeof(struct isis_metric_block);
3095 tmp-=sizeof(struct isis_metric_block);
3096
3097 while(tmp>0) {
3098 ND_TCHECK_1(tptr);
3099 prefix_len=EXTRACT_U_1(tptr); /* read out prefix length in semioctets*/
3100 tptr++;
3101 if (prefix_len < 2) {
3102 ND_PRINT((ndo, "\n\t\tAddress: prefix length %u < 2", prefix_len));
3103 break;
3104 }
3105 tmp--;
3106 if (tmp < prefix_len/2)
3107 break;
3108 ND_TCHECK2(*tptr, prefix_len / 2);
3109 ND_PRINT((ndo, "\n\t\tAddress: %s/%u",
3110 isonsap_string(ndo, tptr, prefix_len / 2), prefix_len * 4));
3111 tptr+=prefix_len/2;
3112 tmp-=prefix_len/2;
3113 }
3114 break;
3115
3116 case ISIS_TLV_IIH_SEQNR:
3117 if (tmp < ISIS_TLV_IIH_SEQNR_MINLEN)
3118 break;
3119 ND_TCHECK2(*tptr, ISIS_TLV_IIH_SEQNR_MINLEN); /* check if four bytes are on the wire */
3120 ND_PRINT((ndo, "\n\t Sequence number: %u", EXTRACT_BE_U_4(tptr)));
3121 break;
3122
3123 case ISIS_TLV_VENDOR_PRIVATE:
3124 if (tmp < ISIS_TLV_VENDOR_PRIVATE_MINLEN)
3125 break;
3126 ND_TCHECK2(*tptr, ISIS_TLV_VENDOR_PRIVATE_MINLEN); /* check if enough byte for a full oui */
3127 vendor_id = EXTRACT_BE_U_3(tptr);
3128 ND_PRINT((ndo, "\n\t Vendor: %s (%u)",
3129 tok2str(oui_values, "Unknown", vendor_id),
3130 vendor_id));
3131 tptr+=3;
3132 tmp-=3;
3133 if (tmp > 0) /* hexdump the rest */
3134 if (!print_unknown_data(ndo, tptr, "\n\t\t", tmp))
3135 return(0);
3136 break;
3137 /*
3138 * FIXME those are the defined TLVs that lack a decoder
3139 * you are welcome to contribute code ;-)
3140 */
3141
3142 case ISIS_TLV_DECNET_PHASE4:
3143 case ISIS_TLV_LUCENT_PRIVATE:
3144 case ISIS_TLV_IPAUTH:
3145 case ISIS_TLV_NORTEL_PRIVATE1:
3146 case ISIS_TLV_NORTEL_PRIVATE2:
3147
3148 default:
3149 if (ndo->ndo_vflag <= 1) {
3150 if (!print_unknown_data(ndo, pptr, "\n\t\t", tlv_len))
3151 return(0);
3152 }
3153 break;
3154 }
3155 /* do we want to see an additionally hexdump ? */
3156 if (ndo->ndo_vflag> 1) {
3157 if (!print_unknown_data(ndo, pptr, "\n\t ", tlv_len))
3158 return(0);
3159 }
3160
3161 pptr += tlv_len;
3162 packet_len -= tlv_len;
3163 }
3164
3165 if (packet_len != 0) {
3166 ND_PRINT((ndo, "\n\t %u straggler bytes", packet_len));
3167 }
3168 return (1);
3169
3170 trunc:
3171 ND_PRINT((ndo, "%s", tstr));
3172 return (1);
3173
3174 trunctlv:
3175 ND_PRINT((ndo, "\n\t\t"));
3176 ND_PRINT((ndo, "%s", tstr));
3177 return(1);
3178 }
3179
3180 static void
3181 osi_print_cksum(netdissect_options *ndo, const uint8_t *pptr,
3182 uint16_t checksum, int checksum_offset, u_int length)
3183 {
3184 uint16_t calculated_checksum;
3185
3186 /* do not attempt to verify the checksum if it is zero,
3187 * if the offset is nonsense,
3188 * or the base pointer is not sane
3189 */
3190 if (!checksum
3191 || checksum_offset < 0
3192 || !ND_TTEST_2(pptr + checksum_offset)
3193 || (u_int)checksum_offset > length
3194 || !ND_TTEST2(*pptr, length)) {
3195 ND_PRINT((ndo, " (unverified)"));
3196 } else {
3197 #if 0
3198 printf("\nosi_print_cksum: %p %u %u\n", pptr, checksum_offset, length);
3199 #endif
3200 calculated_checksum = create_osi_cksum(pptr, checksum_offset, length);
3201 if (checksum == calculated_checksum) {
3202 ND_PRINT((ndo, " (correct)"));
3203 } else {
3204 ND_PRINT((ndo, " (incorrect should be 0x%04x)", calculated_checksum));
3205 }
3206 }
3207 }
3208
3209 /*
3210 * Local Variables:
3211 * c-style: whitesmith
3212 * c-basic-offset: 8
3213 * End:
3214 */
[mirror] the TCPdump network dissector