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[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 /*
30 * specification:
31 *
32 * CLNP: ISO 8473 (respective ITU version is at https://www.itu.int/rec/T-REC-X.233/en/)
33 * ES-IS: ISO 9542
34 * IS-IS: ISO 10589
35 */
36
37 #ifdef HAVE_CONFIG_H
38 #include <config.h>
39 #endif
40
41 #include "netdissect-stdinc.h"
42
43 #include <string.h>
44
45 #include "netdissect.h"
46 #include "addrtoname.h"
47 #include "nlpid.h"
48 #include "extract.h"
49 #include "gmpls.h"
50 #include "oui.h"
51 #include "signature.h"
52 #include "af.h"
53
54
55 /*
56 * IS-IS is defined in ISO 10589. Look there for protocol definitions.
57 */
58
59 #define SYSTEM_ID_LEN MAC_ADDR_LEN
60 #define NODE_ID_LEN (SYSTEM_ID_LEN+1)
61 #define LSP_ID_LEN (SYSTEM_ID_LEN+2)
62
63 #define ISIS_VERSION 1
64 #define ESIS_VERSION 1
65 #define CLNP_VERSION 1
66
67 #define ISIS_PDU_TYPE_MASK 0x1F
68 #define ESIS_PDU_TYPE_MASK 0x1F
69 #define CLNP_PDU_TYPE_MASK 0x1F
70 #define CLNP_FLAG_MASK 0xE0
71 #define ISIS_LAN_PRIORITY_MASK 0x7F
72
73 #define ISIS_PDU_L1_LAN_IIH 15
74 #define ISIS_PDU_L2_LAN_IIH 16
75 #define ISIS_PDU_PTP_IIH 17
76 #define ISIS_PDU_L1_LSP 18
77 #define ISIS_PDU_L2_LSP 20
78 #define ISIS_PDU_L1_CSNP 24
79 #define ISIS_PDU_L2_CSNP 25
80 #define ISIS_PDU_L1_PSNP 26
81 #define ISIS_PDU_L2_PSNP 27
82
83 static const struct tok isis_pdu_values[] = {
84 { ISIS_PDU_L1_LAN_IIH, "L1 Lan IIH"},
85 { ISIS_PDU_L2_LAN_IIH, "L2 Lan IIH"},
86 { ISIS_PDU_PTP_IIH, "p2p IIH"},
87 { ISIS_PDU_L1_LSP, "L1 LSP"},
88 { ISIS_PDU_L2_LSP, "L2 LSP"},
89 { ISIS_PDU_L1_CSNP, "L1 CSNP"},
90 { ISIS_PDU_L2_CSNP, "L2 CSNP"},
91 { ISIS_PDU_L1_PSNP, "L1 PSNP"},
92 { ISIS_PDU_L2_PSNP, "L2 PSNP"},
93 { 0, NULL}
94 };
95
96 /*
97 * A TLV is a tuple of a type, length and a value and is normally used for
98 * encoding information in all sorts of places. This is an enumeration of
99 * the well known types.
100 *
101 * list taken from rfc3359 plus some memory from veterans ;-)
102 */
103
104 #define ISIS_TLV_AREA_ADDR 1 /* iso10589 */
105 #define ISIS_TLV_IS_REACH 2 /* iso10589 */
106 #define ISIS_TLV_ESNEIGH 3 /* iso10589 */
107 #define ISIS_TLV_PART_DIS 4 /* iso10589 */
108 #define ISIS_TLV_PREFIX_NEIGH 5 /* iso10589 */
109 #define ISIS_TLV_ISNEIGH 6 /* iso10589 */
110 #define ISIS_TLV_INSTANCE_ID 7 /* rfc8202 */
111 #define ISIS_TLV_PADDING 8 /* iso10589 */
112 #define ISIS_TLV_LSP 9 /* iso10589 */
113 #define ISIS_TLV_AUTH 10 /* iso10589, rfc3567 */
114 #define ISIS_TLV_CHECKSUM 12 /* rfc3358 */
115 #define ISIS_TLV_CHECKSUM_MINLEN 2
116 #define ISIS_TLV_POI 13 /* rfc6232 */
117 #define ISIS_TLV_LSP_BUFFERSIZE 14 /* iso10589 rev2 */
118 #define ISIS_TLV_EXT_IS_REACH 22 /* rfc5305 */
119 #define ISIS_TLV_IS_ALIAS_ID 24 /* rfc5311 */
120 #define ISIS_TLV_DECNET_PHASE4 42
121 #define ISIS_TLV_LUCENT_PRIVATE 66
122 #define ISIS_TLV_INT_IP_REACH 128 /* rfc1195, rfc2966 */
123 #define ISIS_TLV_PROTOCOLS 129 /* rfc1195 */
124 #define ISIS_TLV_EXT_IP_REACH 130 /* rfc1195, rfc2966 */
125 #define ISIS_TLV_IDRP_INFO 131 /* rfc1195 */
126 #define ISIS_TLV_IPADDR 132 /* rfc1195 */
127 #define ISIS_TLV_IPAUTH 133 /* rfc1195 */
128 #define ISIS_TLV_TE_ROUTER_ID 134 /* rfc5305 */
129 #define ISIS_TLV_EXTD_IP_REACH 135 /* rfc5305 */
130 #define ISIS_TLV_HOSTNAME 137 /* rfc2763 */
131 #define ISIS_TLV_SHARED_RISK_GROUP 138 /* draft-ietf-isis-gmpls-extensions */
132 #define ISIS_TLV_MT_PORT_CAP 143 /* rfc6165 */
133 #define ISIS_TLV_MT_CAPABILITY 144 /* rfc6329 */
134 #define ISIS_TLV_NORTEL_PRIVATE1 176
135 #define ISIS_TLV_NORTEL_PRIVATE2 177
136 #define ISIS_TLV_RESTART_SIGNALING 211 /* rfc3847 */
137 #define ISIS_TLV_RESTART_SIGNALING_FLAGLEN 1
138 #define ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN 2
139 #define ISIS_TLV_MT_IS_REACH 222 /* draft-ietf-isis-wg-multi-topology-05 */
140 #define ISIS_TLV_MT_SUPPORTED 229 /* draft-ietf-isis-wg-multi-topology-05 */
141 #define ISIS_TLV_IP6ADDR 232 /* draft-ietf-isis-ipv6-02 */
142 #define ISIS_TLV_MT_IP_REACH 235 /* draft-ietf-isis-wg-multi-topology-05 */
143 #define ISIS_TLV_IP6_REACH 236 /* draft-ietf-isis-ipv6-02 */
144 #define ISIS_TLV_MT_IP6_REACH 237 /* draft-ietf-isis-wg-multi-topology-05 */
145 #define ISIS_TLV_PTP_ADJ 240 /* rfc3373 */
146 #define ISIS_TLV_IIH_SEQNR 241 /* draft-shen-isis-iih-sequence-00 */
147 #define ISIS_TLV_ROUTER_CAPABILITY 242 /* rfc7981 */
148 #define ISIS_TLV_VENDOR_PRIVATE 250 /* draft-ietf-isis-experimental-tlv-01 */
149 #define ISIS_TLV_VENDOR_PRIVATE_MINLEN 3
150
151 static const struct tok isis_tlv_values[] = {
152 { ISIS_TLV_AREA_ADDR, "Area address(es)"},
153 { ISIS_TLV_IS_REACH, "IS Reachability"},
154 { ISIS_TLV_ESNEIGH, "ES Neighbor(s)"},
155 { ISIS_TLV_PART_DIS, "Partition DIS"},
156 { ISIS_TLV_PREFIX_NEIGH, "Prefix Neighbors"},
157 { ISIS_TLV_ISNEIGH, "IS Neighbor(s)"},
158 { ISIS_TLV_INSTANCE_ID, "Instance Identifier"},
159 { ISIS_TLV_PADDING, "Padding"},
160 { ISIS_TLV_LSP, "LSP entries"},
161 { ISIS_TLV_AUTH, "Authentication"},
162 { ISIS_TLV_CHECKSUM, "Checksum"},
163 { ISIS_TLV_POI, "Purge Originator Identifier"},
164 { ISIS_TLV_LSP_BUFFERSIZE, "LSP Buffersize"},
165 { ISIS_TLV_EXT_IS_REACH, "Extended IS Reachability"},
166 { ISIS_TLV_IS_ALIAS_ID, "IS Alias ID"},
167 { ISIS_TLV_DECNET_PHASE4, "DECnet Phase IV"},
168 { ISIS_TLV_LUCENT_PRIVATE, "Lucent Proprietary"},
169 { ISIS_TLV_INT_IP_REACH, "IPv4 Internal Reachability"},
170 { ISIS_TLV_PROTOCOLS, "Protocols supported"},
171 { ISIS_TLV_EXT_IP_REACH, "IPv4 External Reachability"},
172 { ISIS_TLV_IDRP_INFO, "Inter-Domain Information Type"},
173 { ISIS_TLV_IPADDR, "IPv4 Interface address(es)"},
174 { ISIS_TLV_IPAUTH, "IPv4 authentication (deprecated)"},
175 { ISIS_TLV_TE_ROUTER_ID, "Traffic Engineering Router ID"},
176 { ISIS_TLV_EXTD_IP_REACH, "Extended IPv4 Reachability"},
177 { ISIS_TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"},
178 { ISIS_TLV_MT_PORT_CAP, "Multi-Topology-Aware Port Capability"},
179 { ISIS_TLV_MT_CAPABILITY, "Multi-Topology Capability"},
180 { ISIS_TLV_NORTEL_PRIVATE1, "Nortel Proprietary"},
181 { ISIS_TLV_NORTEL_PRIVATE2, "Nortel Proprietary"},
182 { ISIS_TLV_HOSTNAME, "Hostname"},
183 { ISIS_TLV_RESTART_SIGNALING, "Restart Signaling"},
184 { ISIS_TLV_MT_IS_REACH, "Multi Topology IS Reachability"},
185 { ISIS_TLV_MT_SUPPORTED, "Multi Topology"},
186 { ISIS_TLV_IP6ADDR, "IPv6 Interface address(es)"},
187 { ISIS_TLV_MT_IP_REACH, "Multi-Topology IPv4 Reachability"},
188 { ISIS_TLV_IP6_REACH, "IPv6 reachability"},
189 { ISIS_TLV_MT_IP6_REACH, "Multi-Topology IP6 Reachability"},
190 { ISIS_TLV_PTP_ADJ, "Point-to-point Adjacency State"},
191 { ISIS_TLV_IIH_SEQNR, "Hello PDU Sequence Number"},
192 { ISIS_TLV_ROUTER_CAPABILITY, "IS-IS Router Capability"},
193 { ISIS_TLV_VENDOR_PRIVATE, "Vendor Private"},
194 { 0, NULL }
195 };
196
197 #define ESIS_OPTION_PROTOCOLS 129
198 #define ESIS_OPTION_QOS_MAINTENANCE 195 /* iso9542 */
199 #define ESIS_OPTION_SECURITY 197 /* iso9542 */
200 #define ESIS_OPTION_ES_CONF_TIME 198 /* iso9542 */
201 #define ESIS_OPTION_PRIORITY 205 /* iso9542 */
202 #define ESIS_OPTION_ADDRESS_MASK 225 /* iso9542 */
203 #define ESIS_OPTION_SNPA_MASK 226 /* iso9542 */
204
205 static const struct tok esis_option_values[] = {
206 { ESIS_OPTION_PROTOCOLS, "Protocols supported"},
207 { ESIS_OPTION_QOS_MAINTENANCE, "QoS Maintenance" },
208 { ESIS_OPTION_SECURITY, "Security" },
209 { ESIS_OPTION_ES_CONF_TIME, "ES Configuration Time" },
210 { ESIS_OPTION_PRIORITY, "Priority" },
211 { ESIS_OPTION_ADDRESS_MASK, "Addressk Mask" },
212 { ESIS_OPTION_SNPA_MASK, "SNPA Mask" },
213 { 0, NULL }
214 };
215
216 #define CLNP_OPTION_DISCARD_REASON 193
217 #define CLNP_OPTION_QOS_MAINTENANCE 195 /* iso8473 */
218 #define CLNP_OPTION_SECURITY 197 /* iso8473 */
219 #define CLNP_OPTION_SOURCE_ROUTING 200 /* iso8473 */
220 #define CLNP_OPTION_ROUTE_RECORDING 203 /* iso8473 */
221 #define CLNP_OPTION_PADDING 204 /* iso8473 */
222 #define CLNP_OPTION_PRIORITY 205 /* iso8473 */
223
224 static const struct tok clnp_option_values[] = {
225 { CLNP_OPTION_DISCARD_REASON, "Discard Reason"},
226 { CLNP_OPTION_PRIORITY, "Priority"},
227 { CLNP_OPTION_QOS_MAINTENANCE, "QoS Maintenance"},
228 { CLNP_OPTION_SECURITY, "Security"},
229 { CLNP_OPTION_SOURCE_ROUTING, "Source Routing"},
230 { CLNP_OPTION_ROUTE_RECORDING, "Route Recording"},
231 { CLNP_OPTION_PADDING, "Padding"},
232 { 0, NULL }
233 };
234
235 static const struct tok clnp_option_rfd_class_values[] = {
236 { 0x0, "General"},
237 { 0x8, "Address"},
238 { 0x9, "Source Routeing"},
239 { 0xa, "Lifetime"},
240 { 0xb, "PDU Discarded"},
241 { 0xc, "Reassembly"},
242 { 0, NULL }
243 };
244
245 static const struct tok clnp_option_rfd_general_values[] = {
246 { 0x0, "Reason not specified"},
247 { 0x1, "Protocol procedure error"},
248 { 0x2, "Incorrect checksum"},
249 { 0x3, "PDU discarded due to congestion"},
250 { 0x4, "Header syntax error (cannot be parsed)"},
251 { 0x5, "Segmentation needed but not permitted"},
252 { 0x6, "Incomplete PDU received"},
253 { 0x7, "Duplicate option"},
254 { 0, NULL }
255 };
256
257 static const struct tok clnp_option_rfd_address_values[] = {
258 { 0x0, "Destination address unreachable"},
259 { 0x1, "Destination address unknown"},
260 { 0, NULL }
261 };
262
263 static const struct tok clnp_option_rfd_source_routeing_values[] = {
264 { 0x0, "Unspecified source routeing error"},
265 { 0x1, "Syntax error in source routeing field"},
266 { 0x2, "Unknown address in source routeing field"},
267 { 0x3, "Path not acceptable"},
268 { 0, NULL }
269 };
270
271 static const struct tok clnp_option_rfd_lifetime_values[] = {
272 { 0x0, "Lifetime expired while data unit in transit"},
273 { 0x1, "Lifetime expired during reassembly"},
274 { 0, NULL }
275 };
276
277 static const struct tok clnp_option_rfd_pdu_discard_values[] = {
278 { 0x0, "Unsupported option not specified"},
279 { 0x1, "Unsupported protocol version"},
280 { 0x2, "Unsupported security option"},
281 { 0x3, "Unsupported source routeing option"},
282 { 0x4, "Unsupported recording of route option"},
283 { 0, NULL }
284 };
285
286 static const struct tok clnp_option_rfd_reassembly_values[] = {
287 { 0x0, "Reassembly interference"},
288 { 0, NULL }
289 };
290
291 /* array of 16 error-classes */
292 static const struct tok *clnp_option_rfd_error_class[] = {
293 clnp_option_rfd_general_values,
294 NULL,
295 NULL,
296 NULL,
297 NULL,
298 NULL,
299 NULL,
300 NULL,
301 clnp_option_rfd_address_values,
302 clnp_option_rfd_source_routeing_values,
303 clnp_option_rfd_lifetime_values,
304 clnp_option_rfd_pdu_discard_values,
305 clnp_option_rfd_reassembly_values,
306 NULL,
307 NULL,
308 NULL
309 };
310
311 #define CLNP_OPTION_OPTION_QOS_MASK 0x3f
312 #define CLNP_OPTION_SCOPE_MASK 0xc0
313 #define CLNP_OPTION_SCOPE_SA_SPEC 0x40
314 #define CLNP_OPTION_SCOPE_DA_SPEC 0x80
315 #define CLNP_OPTION_SCOPE_GLOBAL 0xc0
316
317 static const struct tok clnp_option_scope_values[] = {
318 { CLNP_OPTION_SCOPE_SA_SPEC, "Source Address Specific"},
319 { CLNP_OPTION_SCOPE_DA_SPEC, "Destination Address Specific"},
320 { CLNP_OPTION_SCOPE_GLOBAL, "Globally unique"},
321 { 0, NULL }
322 };
323
324 static const struct tok clnp_option_sr_rr_values[] = {
325 { 0x0, "partial"},
326 { 0x1, "complete"},
327 { 0, NULL }
328 };
329
330 static const struct tok clnp_option_sr_rr_string_values[] = {
331 { CLNP_OPTION_SOURCE_ROUTING, "source routing"},
332 { CLNP_OPTION_ROUTE_RECORDING, "recording of route in progress"},
333 { 0, NULL }
334 };
335
336 static const struct tok clnp_option_qos_global_values[] = {
337 { 0x20, "reserved"},
338 { 0x10, "sequencing vs. delay"},
339 { 0x08, "congested"},
340 { 0x04, "delay vs. cost"},
341 { 0x02, "error vs. delay"},
342 { 0x01, "error vs. cost"},
343 { 0, NULL }
344 };
345
346 static const struct tok isis_tlv_router_capability_flags[] = {
347 { 0x01, "S bit"},
348 { 0x02, "D bit"},
349 { 0, NULL }
350 };
351
352 #define ISIS_SUBTLV_ROUTER_CAP_SR 2 /* rfc 8667 */
353
354 static const struct tok isis_router_capability_subtlv_values[] = {
355 { ISIS_SUBTLV_ROUTER_CAP_SR, "SR-Capabilities"},
356 { 0, NULL }
357 };
358
359 static const struct tok isis_router_capability_sr_flags[] = {
360 { 0x80, "ipv4"},
361 { 0x40, "ipv6"},
362 { 0, NULL }
363 };
364
365 #define ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* rfc5305 */
366 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* rfc4205 */
367 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* rfc5305 */
368 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* rfc5305 */
369 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* rfc5305 */
370 #define ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* rfc5305 */
371 #define ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* rfc5305 */
372 #define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* rfc4124 */
373 #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD 12 /* draft-ietf-tewg-diff-te-proto-06 */
374 #define ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* rfc5305 */
375 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE 19 /* draft-ietf-isis-link-attr-01 */
376 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* rfc4205 */
377 #define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* rfc4205 */
378 #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS 22 /* rfc4124 */
379 #define ISIS_SUBTLV_EXT_IS_REACH_LAN_ADJ_SEGMENT_ID 32 /* rfc8667 */
380
381 #define ISIS_SUBTLV_SPB_METRIC 29 /* rfc6329 */
382
383 static const struct tok isis_ext_is_reach_subtlv_values[] = {
384 { ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP, "Administrative groups" },
385 { ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
386 { ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID, "Link Remote Identifier" },
387 { ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR, "IPv4 interface address" },
388 { ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR, "IPv4 neighbor address" },
389 { ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW, "Maximum link bandwidth" },
390 { ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW, "Reservable link bandwidth" },
391 { ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW, "Unreserved bandwidth" },
392 { ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC, "Traffic Engineering Metric" },
393 { ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE, "Link Attribute" },
394 { ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE, "Link Protection Type" },
395 { ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR, "Interface Switching Capability" },
396 { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD, "Bandwidth Constraints (old)" },
397 { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS, "Bandwidth Constraints" },
398 { ISIS_SUBTLV_EXT_IS_REACH_LAN_ADJ_SEGMENT_ID, "LAN Adjacency Segment Identifier" },
399 { ISIS_SUBTLV_SPB_METRIC, "SPB Metric" },
400 { 250, "Reserved for cisco specific extensions" },
401 { 251, "Reserved for cisco specific extensions" },
402 { 252, "Reserved for cisco specific extensions" },
403 { 253, "Reserved for cisco specific extensions" },
404 { 254, "Reserved for cisco specific extensions" },
405 { 255, "Reserved for future expansion" },
406 { 0, NULL }
407 };
408
409 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32 1 /* draft-ietf-isis-admin-tags-01 */
410 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64 2 /* draft-ietf-isis-admin-tags-01 */
411 #define ISIS_SUBTLV_EXTD_IP_REACH_PREFIX_SID 3 /* rfc8667 */
412 #define ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR 117 /* draft-ietf-isis-wg-multi-topology-05 */
413
414 static const struct tok isis_ext_ip_reach_subtlv_values[] = {
415 { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32, "32-Bit Administrative tag" },
416 { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64, "64-Bit Administrative tag" },
417 { ISIS_SUBTLV_EXTD_IP_REACH_PREFIX_SID, "Prefix SID" },
418 { ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR, "Management Prefix Color" },
419 { 0, NULL }
420 };
421
422 #define ISIS_PREFIX_SID_FLAG_R 0x80 /* rfc 8667 */
423 #define ISIS_PREFIX_SID_FLAG_N 0x40 /* rfc 8667 */
424 #define ISIS_PREFIX_SID_FLAG_P 0x20 /* rfc 8667 */
425 #define ISIS_PREFIX_SID_FLAG_E 0x10 /* rfc 8667 */
426 #define ISIS_PREFIX_SID_FLAG_V 0x08 /* rfc 8667 */
427 #define ISIS_PREFIX_SID_FLAG_L 0x04 /* rfc 8667 */
428
429 static const struct tok prefix_sid_flag_values[] = {
430 { ISIS_PREFIX_SID_FLAG_R, "Readvertisement"},
431 { ISIS_PREFIX_SID_FLAG_N, "Node"},
432 { ISIS_PREFIX_SID_FLAG_P, "No-PHP"},
433 { ISIS_PREFIX_SID_FLAG_E, "Explicit NULL"},
434 { ISIS_PREFIX_SID_FLAG_V, "Value"},
435 { ISIS_PREFIX_SID_FLAG_L, "Local"},
436 { 0, NULL}
437 };
438
439
440 /* rfc 8667 */
441 static const struct tok prefix_sid_algo_values[] = {
442 { 0, "SPF"},
443 { 1, "strict-SPF"},
444 { 0, NULL}
445 };
446
447 static const struct tok isis_subtlv_link_attribute_values[] = {
448 { 0x01, "Local Protection Available" },
449 { 0x02, "Link excluded from local protection path" },
450 { 0x04, "Local maintenance required"},
451 { 0, NULL }
452 };
453
454 static const struct tok isis_lan_adj_sid_flag_values[] = {
455 { 0x80, "Address family IPv6" },
456 { 0x40, "Backup" },
457 { 0x20, "Value" },
458 { 0x10, "Local significance" },
459 { 0x08, "Set of adjacencies" },
460 { 0x04, "Persistent" },
461 { 0, NULL }
462 };
463
464 #define ISIS_SUBTLV_AUTH_SIMPLE 1
465 #define ISIS_SUBTLV_AUTH_GENERIC 3 /* rfc 5310 */
466 #define ISIS_SUBTLV_AUTH_MD5 54
467 #define ISIS_SUBTLV_AUTH_MD5_LEN 16
468 #define ISIS_SUBTLV_AUTH_PRIVATE 255
469
470 static const struct tok isis_subtlv_auth_values[] = {
471 { ISIS_SUBTLV_AUTH_SIMPLE, "simple text password"},
472 { ISIS_SUBTLV_AUTH_GENERIC, "Generic Crypto key-id"},
473 { ISIS_SUBTLV_AUTH_MD5, "HMAC-MD5 password"},
474 { ISIS_SUBTLV_AUTH_PRIVATE, "Routing Domain private password"},
475 { 0, NULL }
476 };
477
478 #define ISIS_SUBTLV_IDRP_RES 0
479 #define ISIS_SUBTLV_IDRP_LOCAL 1
480 #define ISIS_SUBTLV_IDRP_ASN 2
481
482 static const struct tok isis_subtlv_idrp_values[] = {
483 { ISIS_SUBTLV_IDRP_RES, "Reserved"},
484 { ISIS_SUBTLV_IDRP_LOCAL, "Routing-Domain Specific"},
485 { ISIS_SUBTLV_IDRP_ASN, "AS Number Tag"},
486 { 0, NULL}
487 };
488
489 #define ISIS_SUBTLV_SPB_MCID 4
490 #define ISIS_SUBTLV_SPB_DIGEST 5
491 #define ISIS_SUBTLV_SPB_BVID 6
492
493 #define ISIS_SUBTLV_SPB_INSTANCE 1
494 #define ISIS_SUBTLV_SPBM_SI 3
495
496 #define ISIS_SPB_MCID_LEN 51
497 #define ISIS_SUBTLV_SPB_MCID_MIN_LEN 102
498 #define ISIS_SUBTLV_SPB_DIGEST_MIN_LEN 33
499 #define ISIS_SUBTLV_SPB_BVID_MIN_LEN 6
500 #define ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN 19
501 #define ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN 8
502
503 static const struct tok isis_mt_port_cap_subtlv_values[] = {
504 { ISIS_SUBTLV_SPB_MCID, "SPB MCID" },
505 { ISIS_SUBTLV_SPB_DIGEST, "SPB Digest" },
506 { ISIS_SUBTLV_SPB_BVID, "SPB BVID" },
507 { 0, NULL }
508 };
509
510 static const struct tok isis_mt_capability_subtlv_values[] = {
511 { ISIS_SUBTLV_SPB_INSTANCE, "SPB Instance" },
512 { ISIS_SUBTLV_SPBM_SI, "SPBM Service Identifier and Unicast Address" },
513 { 0, NULL }
514 };
515
516 struct isis_spb_mcid {
517 nd_uint8_t format_id;
518 nd_byte name[32];
519 nd_uint16_t revision_lvl;
520 nd_byte digest[16];
521 };
522
523 struct isis_subtlv_spb_mcid {
524 struct isis_spb_mcid mcid;
525 struct isis_spb_mcid aux_mcid;
526 };
527
528 struct isis_subtlv_spb_instance {
529 nd_byte cist_root_id[8];
530 nd_uint32_t cist_external_root_path_cost;
531 nd_uint16_t bridge_priority;
532 nd_uint32_t spsourceid;
533 nd_uint8_t no_of_trees;
534 };
535
536 #define CLNP_SEGMENT_PART 0x80
537 #define CLNP_MORE_SEGMENTS 0x40
538 #define CLNP_REQUEST_ER 0x20
539
540 static const struct tok clnp_flag_values[] = {
541 { CLNP_SEGMENT_PART, "Segmentation permitted"},
542 { CLNP_MORE_SEGMENTS, "more Segments"},
543 { CLNP_REQUEST_ER, "request Error Report"},
544 { 0, NULL}
545 };
546
547 #define ISIS_MASK_LSP_OL_BIT(x) (GET_U_1(x)&0x4)
548 #define ISIS_MASK_LSP_ISTYPE_BITS(x) (GET_U_1(x)&0x3)
549 #define ISIS_MASK_LSP_PARTITION_BIT(x) (GET_U_1(x)&0x80)
550 #define ISIS_MASK_LSP_ATT_BITS(x) (GET_U_1(x)&0x78)
551 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x) (GET_U_1(x)&0x40)
552 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) (GET_U_1(x)&0x20)
553 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x) (GET_U_1(x)&0x10)
554 #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) (GET_U_1(x)&0x8)
555
556 #define ISIS_MASK_MTID(x) ((x)&0x0fff)
557 #define ISIS_MASK_MTFLAGS(x) ((x)&0xf000)
558
559 static const struct tok isis_mt_flag_values[] = {
560 { 0x4000, "ATT bit set"},
561 { 0x8000, "Overload bit set"},
562 { 0, NULL}
563 };
564
565 #define ISIS_MASK_TLV_EXTD_IP_UPDOWN(x) ((x)&0x80)
566 #define ISIS_MASK_TLV_EXTD_IP_SUBTLV(x) ((x)&0x40)
567
568 #define ISIS_MASK_TLV_EXTD_IP6_IE(x) ((x)&0x40)
569 #define ISIS_MASK_TLV_EXTD_IP6_SUBTLV(x) ((x)&0x20)
570
571 #define ISIS_LSP_TLV_METRIC_SUPPORTED(x) (GET_U_1(x)&0x80)
572 #define ISIS_LSP_TLV_METRIC_IE(x) (GET_U_1(x)&0x40)
573 #define ISIS_LSP_TLV_METRIC_UPDOWN(x) (GET_U_1(x)&0x80)
574 #define ISIS_LSP_TLV_METRIC_VALUE(x) (GET_U_1(x)&0x3f)
575
576 #define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1)
577
578 static const struct tok isis_mt_values[] = {
579 { 0, "IPv4 unicast"},
580 { 1, "In-Band Management"},
581 { 2, "IPv6 unicast"},
582 { 3, "Multicast"},
583 { 4095, "Development, Experimental or Proprietary"},
584 { 0, NULL }
585 };
586
587 static const struct tok isis_iih_circuit_type_values[] = {
588 { 1, "Level 1 only"},
589 { 2, "Level 2 only"},
590 { 3, "Level 1, Level 2"},
591 { 0, NULL}
592 };
593
594 #define ISIS_LSP_TYPE_UNUSED0 0
595 #define ISIS_LSP_TYPE_LEVEL_1 1
596 #define ISIS_LSP_TYPE_UNUSED2 2
597 #define ISIS_LSP_TYPE_LEVEL_2 3
598
599 static const struct tok isis_lsp_istype_values[] = {
600 { ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"},
601 { ISIS_LSP_TYPE_LEVEL_1, "L1 IS"},
602 { ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"},
603 { ISIS_LSP_TYPE_LEVEL_2, "L2 IS"},
604 { 0, NULL }
605 };
606
607 /*
608 * Katz's point to point adjacency TLV uses codes to tell us the state of
609 * the remote adjacency. Enumerate them.
610 */
611
612 #define ISIS_PTP_ADJ_UP 0
613 #define ISIS_PTP_ADJ_INIT 1
614 #define ISIS_PTP_ADJ_DOWN 2
615
616 static const struct tok isis_ptp_adjancey_values[] = {
617 { ISIS_PTP_ADJ_UP, "Up" },
618 { ISIS_PTP_ADJ_INIT, "Initializing" },
619 { ISIS_PTP_ADJ_DOWN, "Down" },
620 { 0, NULL}
621 };
622
623 struct isis_tlv_ptp_adj {
624 nd_uint8_t adjacency_state;
625 nd_uint32_t extd_local_circuit_id;
626 nd_byte neighbor_sysid[SYSTEM_ID_LEN];
627 nd_uint32_t neighbor_extd_local_circuit_id;
628 };
629
630 static void osi_print_cksum(netdissect_options *, const uint8_t *pptr,
631 uint16_t checksum, int checksum_offset, u_int length);
632 static int clnp_print(netdissect_options *, const uint8_t *, u_int);
633 static void esis_print(netdissect_options *, const uint8_t *, u_int);
634 static int isis_print(netdissect_options *, const uint8_t *, u_int);
635
636 struct isis_metric_block {
637 nd_uint8_t metric_default;
638 nd_uint8_t metric_delay;
639 nd_uint8_t metric_expense;
640 nd_uint8_t metric_error;
641 };
642
643 struct isis_tlv_is_reach {
644 struct isis_metric_block isis_metric_block;
645 nd_byte neighbor_nodeid[NODE_ID_LEN];
646 };
647
648 struct isis_tlv_es_reach {
649 struct isis_metric_block isis_metric_block;
650 nd_byte neighbor_sysid[SYSTEM_ID_LEN];
651 };
652
653 struct isis_tlv_ip_reach {
654 struct isis_metric_block isis_metric_block;
655 nd_ipv4 prefix;
656 nd_ipv4 mask;
657 };
658
659 static const struct tok isis_is_reach_virtual_values[] = {
660 { 0, "IsNotVirtual"},
661 { 1, "IsVirtual"},
662 { 0, NULL }
663 };
664
665 static const struct tok isis_restart_flag_values[] = {
666 { 0x1, "Restart Request"},
667 { 0x2, "Restart Acknowledgement"},
668 { 0x4, "Suppress adjacency advertisement"},
669 { 0, NULL }
670 };
671
672 struct isis_common_header {
673 nd_uint8_t nlpid;
674 nd_uint8_t fixed_len;
675 nd_uint8_t version; /* Protocol version */
676 nd_uint8_t id_length;
677 nd_uint8_t pdu_type; /* 3 MSbits are reserved */
678 nd_uint8_t pdu_version; /* Packet format version */
679 nd_byte reserved;
680 nd_uint8_t max_area;
681 };
682
683 struct isis_iih_lan_header {
684 nd_uint8_t circuit_type;
685 nd_byte source_id[SYSTEM_ID_LEN];
686 nd_uint16_t holding_time;
687 nd_uint16_t pdu_len;
688 nd_uint8_t priority;
689 nd_byte lan_id[NODE_ID_LEN];
690 };
691
692 struct isis_iih_ptp_header {
693 nd_uint8_t circuit_type;
694 nd_byte source_id[SYSTEM_ID_LEN];
695 nd_uint16_t holding_time;
696 nd_uint16_t pdu_len;
697 nd_uint8_t circuit_id;
698 };
699
700 struct isis_lsp_header {
701 nd_uint16_t pdu_len;
702 nd_uint16_t remaining_lifetime;
703 nd_byte lsp_id[LSP_ID_LEN];
704 nd_uint32_t sequence_number;
705 nd_uint16_t checksum;
706 nd_uint8_t typeblock;
707 };
708
709 struct isis_csnp_header {
710 nd_uint16_t pdu_len;
711 nd_byte source_id[NODE_ID_LEN];
712 nd_byte start_lsp_id[LSP_ID_LEN];
713 nd_byte end_lsp_id[LSP_ID_LEN];
714 };
715
716 struct isis_psnp_header {
717 nd_uint16_t pdu_len;
718 nd_byte source_id[NODE_ID_LEN];
719 };
720
721 struct isis_tlv_lsp {
722 nd_uint16_t remaining_lifetime;
723 nd_byte lsp_id[LSP_ID_LEN];
724 nd_uint32_t sequence_number;
725 nd_uint16_t checksum;
726 };
727
728 #define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
729 #define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header))
730 #define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header))
731 #define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header))
732 #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header))
733 #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header))
734
735 void
736 isoclns_print(netdissect_options *ndo, const u_char *p, u_int length)
737 {
738 ndo->ndo_protocol = "isoclns";
739
740 if (ndo->ndo_eflag)
741 ND_PRINT("OSI NLPID %s (0x%02x): ",
742 tok2str(nlpid_values, "Unknown", GET_U_1(p)),
743 GET_U_1(p));
744
745 switch (GET_U_1(p)) {
746
747 case NLPID_CLNP:
748 if (!clnp_print(ndo, p, length))
749 print_unknown_data(ndo, p, "\n\t", length);
750 break;
751
752 case NLPID_ESIS:
753 esis_print(ndo, p, length);
754 return;
755
756 case NLPID_ISIS:
757 if (!isis_print(ndo, p, length))
758 print_unknown_data(ndo, p, "\n\t", length);
759 break;
760
761 case NLPID_NULLNS:
762 ND_PRINT("%slength: %u", ndo->ndo_eflag ? "" : ", ", length);
763 break;
764
765 case NLPID_Q933:
766 q933_print(ndo, p + 1, length - 1);
767 break;
768
769 case NLPID_IP:
770 ip_print(ndo, p + 1, length - 1);
771 break;
772
773 case NLPID_IP6:
774 ip6_print(ndo, p + 1, length - 1);
775 break;
776
777 case NLPID_PPP:
778 ppp_print(ndo, p + 1, length - 1);
779 break;
780
781 default:
782 if (!ndo->ndo_eflag)
783 ND_PRINT("OSI NLPID 0x%02x unknown", GET_U_1(p));
784 ND_PRINT("%slength: %u", ndo->ndo_eflag ? "" : ", ", length);
785 if (length > 1)
786 print_unknown_data(ndo, p, "\n\t", length);
787 break;
788 }
789 }
790
791 #define CLNP_PDU_ER 1
792 #define CLNP_PDU_DT 28
793 #define CLNP_PDU_MD 29
794 #define CLNP_PDU_ERQ 30
795 #define CLNP_PDU_ERP 31
796
797 static const struct tok clnp_pdu_values[] = {
798 { CLNP_PDU_ER, "Error Report"},
799 { CLNP_PDU_MD, "MD"},
800 { CLNP_PDU_DT, "Data"},
801 { CLNP_PDU_ERQ, "Echo Request"},
802 { CLNP_PDU_ERP, "Echo Response"},
803 { 0, NULL }
804 };
805
806 struct clnp_header_t {
807 nd_uint8_t nlpid;
808 nd_uint8_t length_indicator;
809 nd_uint8_t version;
810 nd_uint8_t lifetime; /* units of 500ms */
811 nd_uint8_t type;
812 nd_uint16_t segment_length;
813 nd_uint16_t cksum;
814 };
815
816 struct clnp_segment_header_t {
817 nd_uint16_t data_unit_id;
818 nd_uint16_t segment_offset;
819 nd_uint16_t total_length;
820 };
821
822 /*
823 * clnp_print
824 * Decode CLNP packets. Return 0 on error.
825 */
826
827 static int
828 clnp_print(netdissect_options *ndo,
829 const uint8_t *pptr, u_int length)
830 {
831 const uint8_t *optr,*source_address,*dest_address;
832 u_int li,li_remaining,tlen,nsap_offset,source_address_length,dest_address_length, clnp_pdu_type, clnp_flags;
833 const struct clnp_header_t *clnp_header;
834 const struct clnp_segment_header_t *clnp_segment_header;
835 uint8_t rfd_error,rfd_error_major,rfd_error_minor;
836
837 ndo->ndo_protocol = "clnp";
838 clnp_header = (const struct clnp_header_t *) pptr;
839 ND_TCHECK_SIZE(clnp_header);
840
841 li = GET_U_1(clnp_header->length_indicator);
842 li_remaining = li;
843 optr = pptr;
844
845 if (!ndo->ndo_eflag)
846 nd_print_protocol_caps(ndo);
847
848 /*
849 * Sanity checking of the header.
850 */
851
852 if (GET_U_1(clnp_header->version) != CLNP_VERSION) {
853 ND_PRINT("version %u packet not supported",
854 GET_U_1(clnp_header->version));
855 return (0);
856 }
857
858 if (li > length) {
859 ND_PRINT(" length indicator(%u) > PDU size (%u)!", li, length);
860 return (0);
861 }
862
863 if (li < sizeof(struct clnp_header_t)) {
864 ND_PRINT(" length indicator %u < min PDU size:", li);
865 while (pptr < ndo->ndo_snapend) {
866 ND_PRINT("%02X", GET_U_1(pptr));
867 pptr++;
868 }
869 return (0);
870 }
871
872 /* FIXME further header sanity checking */
873
874 clnp_pdu_type = GET_U_1(clnp_header->type) & CLNP_PDU_TYPE_MASK;
875 clnp_flags = GET_U_1(clnp_header->type) & CLNP_FLAG_MASK;
876
877 pptr += sizeof(struct clnp_header_t);
878 li_remaining -= sizeof(struct clnp_header_t);
879
880 if (li_remaining < 1) {
881 ND_PRINT("li < size of fixed part of CLNP header and addresses");
882 return (0);
883 }
884 dest_address_length = GET_U_1(pptr);
885 pptr += 1;
886 li_remaining -= 1;
887 if (li_remaining < dest_address_length) {
888 ND_PRINT("li < size of fixed part of CLNP header and addresses");
889 return (0);
890 }
891 ND_TCHECK_LEN(pptr, dest_address_length);
892 dest_address = pptr;
893 pptr += dest_address_length;
894 li_remaining -= dest_address_length;
895
896 if (li_remaining < 1) {
897 ND_PRINT("li < size of fixed part of CLNP header and addresses");
898 return (0);
899 }
900 source_address_length = GET_U_1(pptr);
901 pptr += 1;
902 li_remaining -= 1;
903 if (li_remaining < source_address_length) {
904 ND_PRINT("li < size of fixed part of CLNP header and addresses");
905 return (0);
906 }
907 ND_TCHECK_LEN(pptr, source_address_length);
908 source_address = pptr;
909 pptr += source_address_length;
910 li_remaining -= source_address_length;
911
912 if (ndo->ndo_vflag < 1) {
913 ND_PRINT("%s%s > %s, %s, length %u",
914 ndo->ndo_eflag ? "" : ", ",
915 GET_ISONSAP_STRING(source_address, source_address_length),
916 GET_ISONSAP_STRING(dest_address, dest_address_length),
917 tok2str(clnp_pdu_values,"unknown (%u)",clnp_pdu_type),
918 length);
919 return (1);
920 }
921 ND_PRINT("%slength %u", ndo->ndo_eflag ? "" : ", ", length);
922
923 ND_PRINT("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x",
924 tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type),
925 GET_U_1(clnp_header->length_indicator),
926 GET_U_1(clnp_header->version),
927 GET_U_1(clnp_header->lifetime)/2,
928 (GET_U_1(clnp_header->lifetime)%2)*5,
929 GET_BE_U_2(clnp_header->segment_length),
930 GET_BE_U_2(clnp_header->cksum));
931
932 osi_print_cksum(ndo, optr, GET_BE_U_2(clnp_header->cksum), 7,
933 GET_U_1(clnp_header->length_indicator));
934
935 ND_PRINT("\n\tFlags [%s]",
936 bittok2str(clnp_flag_values, "none", clnp_flags));
937
938 ND_PRINT("\n\tsource address (length %u): %s\n\tdest address (length %u): %s",
939 source_address_length,
940 GET_ISONSAP_STRING(source_address, source_address_length),
941 dest_address_length,
942 GET_ISONSAP_STRING(dest_address, dest_address_length));
943
944 if (clnp_flags & CLNP_SEGMENT_PART) {
945 if (li_remaining < sizeof(struct clnp_segment_header_t)) {
946 ND_PRINT("li < size of fixed part of CLNP header, addresses, and segment part");
947 return (0);
948 }
949 clnp_segment_header = (const struct clnp_segment_header_t *) pptr;
950 ND_TCHECK_SIZE(clnp_segment_header);
951 ND_PRINT("\n\tData Unit ID: 0x%04x, Segment Offset: %u, Total PDU Length: %u",
952 GET_BE_U_2(clnp_segment_header->data_unit_id),
953 GET_BE_U_2(clnp_segment_header->segment_offset),
954 GET_BE_U_2(clnp_segment_header->total_length));
955 pptr+=sizeof(struct clnp_segment_header_t);
956 li_remaining-=sizeof(struct clnp_segment_header_t);
957 }
958
959 /* now walk the options */
960 while (li_remaining != 0) {
961 u_int op, opli;
962 const uint8_t *tptr;
963
964 if (li_remaining < 2) {
965 ND_PRINT(", bad opts/li");
966 return (0);
967 }
968 op = GET_U_1(pptr);
969 opli = GET_U_1(pptr + 1);
970 pptr += 2;
971 li_remaining -= 2;
972 if (opli > li_remaining) {
973 ND_PRINT(", opt (%u) too long", op);
974 return (0);
975 }
976 ND_TCHECK_LEN(pptr, opli);
977 li_remaining -= opli;
978 tptr = pptr;
979 tlen = opli;
980
981 ND_PRINT("\n\t %s Option #%u, length %u, value: ",
982 tok2str(clnp_option_values,"Unknown",op),
983 op,
984 opli);
985
986 /*
987 * We've already checked that the entire option is present
988 * in the captured packet with the ND_TCHECK_LEN() call.
989 * Therefore, we don't need to do ND_TCHECK()/ND_TCHECK_LEN()
990 * checks.
991 * We do, however, need to check tlen, to make sure we
992 * don't run past the end of the option.
993 */
994 switch (op) {
995
996
997 case CLNP_OPTION_ROUTE_RECORDING: /* those two options share the format */
998 case CLNP_OPTION_SOURCE_ROUTING:
999 if (tlen < 2) {
1000 ND_PRINT(", bad opt len");
1001 return (0);
1002 }
1003 ND_PRINT("%s %s",
1004 tok2str(clnp_option_sr_rr_values,"Unknown",GET_U_1(tptr)),
1005 tok2str(clnp_option_sr_rr_string_values, "Unknown Option %u", op));
1006 nsap_offset=GET_U_1(tptr + 1);
1007 if (nsap_offset == 0) {
1008 ND_PRINT(" Bad NSAP offset (0)");
1009 break;
1010 }
1011 nsap_offset-=1; /* offset to nsap list */
1012 if (nsap_offset > tlen) {
1013 ND_PRINT(" Bad NSAP offset (past end of option)");
1014 break;
1015 }
1016 tptr+=nsap_offset;
1017 tlen-=nsap_offset;
1018 while (tlen > 0) {
1019 source_address_length=GET_U_1(tptr);
1020 if (tlen < source_address_length+1) {
1021 ND_PRINT("\n\t NSAP address goes past end of option");
1022 break;
1023 }
1024 if (source_address_length > 0) {
1025 source_address=(tptr+1);
1026 ND_PRINT("\n\t NSAP address (length %u): %s",
1027 source_address_length,
1028 GET_ISONSAP_STRING(source_address, source_address_length));
1029 }
1030 tlen-=source_address_length+1;
1031 }
1032 break;
1033
1034 case CLNP_OPTION_PRIORITY:
1035 if (tlen < 1) {
1036 ND_PRINT(", bad opt len");
1037 return (0);
1038 }
1039 ND_PRINT("0x%1x", GET_U_1(tptr)&0x0f);
1040 break;
1041
1042 case CLNP_OPTION_QOS_MAINTENANCE:
1043 if (tlen < 1) {
1044 ND_PRINT(", bad opt len");
1045 return (0);
1046 }
1047 ND_PRINT("\n\t Format Code: %s",
1048 tok2str(clnp_option_scope_values, "Reserved", GET_U_1(tptr) & CLNP_OPTION_SCOPE_MASK));
1049
1050 if ((GET_U_1(tptr)&CLNP_OPTION_SCOPE_MASK) == CLNP_OPTION_SCOPE_GLOBAL)
1051 ND_PRINT("\n\t QoS Flags [%s]",
1052 bittok2str(clnp_option_qos_global_values,
1053 "none",
1054 GET_U_1(tptr)&CLNP_OPTION_OPTION_QOS_MASK));
1055 break;
1056
1057 case CLNP_OPTION_SECURITY:
1058 if (tlen < 2) {
1059 ND_PRINT(", bad opt len");
1060 return (0);
1061 }
1062 ND_PRINT("\n\t Format Code: %s, Security-Level %u",
1063 tok2str(clnp_option_scope_values,"Reserved",GET_U_1(tptr)&CLNP_OPTION_SCOPE_MASK),
1064 GET_U_1(tptr + 1));
1065 break;
1066
1067 case CLNP_OPTION_DISCARD_REASON:
1068 if (tlen < 1) {
1069 ND_PRINT(", bad opt len");
1070 return (0);
1071 }
1072 rfd_error = GET_U_1(tptr);
1073 rfd_error_major = (rfd_error&0xf0) >> 4;
1074 rfd_error_minor = rfd_error&0x0f;
1075 ND_PRINT("\n\t Class: %s Error (0x%01x), %s (0x%01x)",
1076 tok2str(clnp_option_rfd_class_values,"Unknown",rfd_error_major),
1077 rfd_error_major,
1078 tok2str(clnp_option_rfd_error_class[rfd_error_major],"Unknown",rfd_error_minor),
1079 rfd_error_minor);
1080 break;
1081
1082 case CLNP_OPTION_PADDING:
1083 ND_PRINT("padding data");
1084 break;
1085
1086 /*
1087 * FIXME those are the defined Options that lack a decoder
1088 * you are welcome to contribute code ;-)
1089 */
1090
1091 default:
1092 print_unknown_data(ndo, tptr, "\n\t ", opli);
1093 break;
1094 }
1095 if (ndo->ndo_vflag > 1)
1096 print_unknown_data(ndo, pptr, "\n\t ", opli);
1097 pptr += opli;
1098 }
1099
1100 switch (clnp_pdu_type) {
1101
1102 case CLNP_PDU_ER: /* fall through */
1103 case CLNP_PDU_ERP:
1104 if (GET_U_1(pptr) == NLPID_CLNP) {
1105 ND_PRINT("\n\t-----original packet-----\n\t");
1106 /* FIXME recursion protection */
1107 clnp_print(ndo, pptr, length - li);
1108 break;
1109 }
1110
1111 /* The cases above break from the switch block if they see and print
1112 * a CLNP header in the Data part. For an Error Report PDU this is
1113 * described in Section 7.9.6 of ITU X.233 (1997 E), also known as
1114 * ISO/IEC 8473-1:1998(E). It is not clear why in this code the same
1115 * applies to an Echo Response PDU, as the standard does not specify
1116 * the contents -- could be a proprietary extension or a bug. In either
1117 * case, if the Data part does not contain a CLNP header, its structure
1118 * is considered unknown and the decoding falls through to print the
1119 * contents as-is.
1120 */
1121 ND_FALL_THROUGH;
1122
1123 case CLNP_PDU_DT:
1124 case CLNP_PDU_MD:
1125 case CLNP_PDU_ERQ:
1126
1127 default:
1128 /* dump the PDU specific data */
1129 if (length > ND_BYTES_BETWEEN(pptr, optr)) {
1130 ND_PRINT("\n\t undecoded non-header data, length %u", length-li);
1131 print_unknown_data(ndo, pptr, "\n\t ", length - ND_BYTES_BETWEEN(pptr, optr));
1132 }
1133 }
1134
1135 return (1);
1136
1137 trunc:
1138 nd_print_trunc(ndo);
1139 return (1);
1140
1141 }
1142
1143
1144 #define ESIS_PDU_REDIRECT 6
1145 #define ESIS_PDU_ESH 2
1146 #define ESIS_PDU_ISH 4
1147
1148 static const struct tok esis_pdu_values[] = {
1149 { ESIS_PDU_REDIRECT, "redirect"},
1150 { ESIS_PDU_ESH, "ESH"},
1151 { ESIS_PDU_ISH, "ISH"},
1152 { 0, NULL }
1153 };
1154
1155 struct esis_header_t {
1156 nd_uint8_t nlpid;
1157 nd_uint8_t length_indicator;
1158 nd_uint8_t version;
1159 nd_byte reserved;
1160 nd_uint8_t type;
1161 nd_uint16_t holdtime;
1162 nd_uint16_t cksum;
1163 };
1164
1165 static void
1166 esis_print(netdissect_options *ndo,
1167 const uint8_t *pptr, u_int length)
1168 {
1169 const uint8_t *optr;
1170 u_int li, version, esis_pdu_type, source_address_length, source_address_number;
1171 const struct esis_header_t *esis_header;
1172
1173 ndo->ndo_protocol = "esis";
1174 if (!ndo->ndo_eflag)
1175 ND_PRINT("ES-IS");
1176
1177 if (length <= 2) {
1178 ND_PRINT(ndo->ndo_qflag ? "bad pkt!" : "no header at all!");
1179 return;
1180 }
1181
1182 esis_header = (const struct esis_header_t *) pptr;
1183 ND_TCHECK_SIZE(esis_header);
1184 li = GET_U_1(esis_header->length_indicator);
1185 optr = pptr;
1186
1187 /*
1188 * Sanity checking of the header.
1189 */
1190
1191 if (GET_U_1(esis_header->nlpid) != NLPID_ESIS) {
1192 ND_PRINT(" nlpid 0x%02x packet not supported",
1193 GET_U_1(esis_header->nlpid));
1194 return;
1195 }
1196
1197 version = GET_U_1(esis_header->version);
1198 if (version != ESIS_VERSION) {
1199 ND_PRINT(" version %u packet not supported", version);
1200 return;
1201 }
1202
1203 if (li > length) {
1204 ND_PRINT(" length indicator(%u) > PDU size (%u)!", li, length);
1205 return;
1206 }
1207
1208 if (li < sizeof(struct esis_header_t) + 2) {
1209 ND_PRINT(" length indicator %u < min PDU size:", li);
1210 while (pptr < ndo->ndo_snapend) {
1211 ND_PRINT("%02X", GET_U_1(pptr));
1212 pptr++;
1213 }
1214 return;
1215 }
1216
1217 esis_pdu_type = GET_U_1(esis_header->type) & ESIS_PDU_TYPE_MASK;
1218
1219 if (ndo->ndo_vflag < 1) {
1220 ND_PRINT("%s%s, length %u",
1221 ndo->ndo_eflag ? "" : ", ",
1222 tok2str(esis_pdu_values,"unknown type (%u)",esis_pdu_type),
1223 length);
1224 return;
1225 } else
1226 ND_PRINT("%slength %u\n\t%s (%u)",
1227 ndo->ndo_eflag ? "" : ", ",
1228 length,
1229 tok2str(esis_pdu_values,"unknown type: %u", esis_pdu_type),
1230 esis_pdu_type);
1231
1232 ND_PRINT(", v: %u%s", version, version == ESIS_VERSION ? "" : "unsupported" );
1233 ND_PRINT(", checksum: 0x%04x", GET_BE_U_2(esis_header->cksum));
1234
1235 osi_print_cksum(ndo, pptr, GET_BE_U_2(esis_header->cksum), 7,
1236 li);
1237
1238 ND_PRINT(", holding time: %us, length indicator: %u",
1239 GET_BE_U_2(esis_header->holdtime), li);
1240
1241 if (ndo->ndo_vflag > 1)
1242 print_unknown_data(ndo, optr, "\n\t", sizeof(struct esis_header_t));
1243
1244 pptr += sizeof(struct esis_header_t);
1245 li -= sizeof(struct esis_header_t);
1246
1247 switch (esis_pdu_type) {
1248 case ESIS_PDU_REDIRECT: {
1249 const uint8_t *dst, *snpa, *neta;
1250 u_int dstl, snpal, netal;
1251
1252 ND_TCHECK_1(pptr);
1253 if (li < 1) {
1254 ND_PRINT(", bad redirect/li");
1255 return;
1256 }
1257 dstl = GET_U_1(pptr);
1258 pptr++;
1259 li--;
1260 ND_TCHECK_LEN(pptr, dstl);
1261 if (li < dstl) {
1262 ND_PRINT(", bad redirect/li");
1263 return;
1264 }
1265 dst = pptr;
1266 pptr += dstl;
1267 li -= dstl;
1268 ND_PRINT("\n\t %s", GET_ISONSAP_STRING(dst, dstl));
1269
1270 ND_TCHECK_1(pptr);
1271 if (li < 1) {
1272 ND_PRINT(", bad redirect/li");
1273 return;
1274 }
1275 snpal = GET_U_1(pptr);
1276 pptr++;
1277 li--;
1278 ND_TCHECK_LEN(pptr, snpal);
1279 if (li < snpal) {
1280 ND_PRINT(", bad redirect/li");
1281 return;
1282 }
1283 snpa = pptr;
1284 pptr += snpal;
1285 li -= snpal;
1286 ND_TCHECK_1(pptr);
1287 if (li < 1) {
1288 ND_PRINT(", bad redirect/li");
1289 return;
1290 }
1291 netal = GET_U_1(pptr);
1292 pptr++;
1293 ND_TCHECK_LEN(pptr, netal);
1294 if (li < netal) {
1295 ND_PRINT(", bad redirect/li");
1296 return;
1297 }
1298 neta = pptr;
1299 pptr += netal;
1300 li -= netal;
1301
1302 if (snpal == MAC_ADDR_LEN)
1303 ND_PRINT("\n\t SNPA (length: %u): %s",
1304 snpal,
1305 GET_ETHERADDR_STRING(snpa));
1306 else
1307 ND_PRINT("\n\t SNPA (length: %u): %s",
1308 snpal,
1309 GET_LINKADDR_STRING(snpa, LINKADDR_OTHER, snpal));
1310 if (netal != 0)
1311 ND_PRINT("\n\t NET (length: %u) %s",
1312 netal,
1313 GET_ISONSAP_STRING(neta, netal));
1314 break;
1315 }
1316
1317 case ESIS_PDU_ESH:
1318 ND_TCHECK_1(pptr);
1319 if (li < 1) {
1320 ND_PRINT(", bad esh/li");
1321 return;
1322 }
1323 source_address_number = GET_U_1(pptr);
1324 pptr++;
1325 li--;
1326
1327 ND_PRINT("\n\t Number of Source Addresses: %u", source_address_number);
1328
1329 while (source_address_number > 0) {
1330 ND_TCHECK_1(pptr);
1331 if (li < 1) {
1332 ND_PRINT(", bad esh/li");
1333 return;
1334 }
1335 source_address_length = GET_U_1(pptr);
1336 pptr++;
1337 li--;
1338
1339 ND_TCHECK_LEN(pptr, source_address_length);
1340 if (li < source_address_length) {
1341 ND_PRINT(", bad esh/li");
1342 return;
1343 }
1344 ND_PRINT("\n\t NET (length: %u): %s",
1345 source_address_length,
1346 GET_ISONSAP_STRING(pptr, source_address_length));
1347 pptr += source_address_length;
1348 li -= source_address_length;
1349 source_address_number--;
1350 }
1351
1352 break;
1353
1354 case ESIS_PDU_ISH: {
1355 ND_TCHECK_1(pptr);
1356 if (li < 1) {
1357 ND_PRINT(", bad ish/li");
1358 return;
1359 }
1360 source_address_length = GET_U_1(pptr);
1361 pptr++;
1362 li--;
1363 ND_TCHECK_LEN(pptr, source_address_length);
1364 if (li < source_address_length) {
1365 ND_PRINT(", bad ish/li");
1366 return;
1367 }
1368 ND_PRINT("\n\t NET (length: %u): %s", source_address_length, GET_ISONSAP_STRING(pptr, source_address_length));
1369 pptr += source_address_length;
1370 li -= source_address_length;
1371 break;
1372 }
1373
1374 default:
1375 if (ndo->ndo_vflag <= 1) {
1376 /*
1377 * If there's at least one byte to print, print
1378 * it/them.
1379 */
1380 if (ND_TTEST_LEN(pptr, 1))
1381 print_unknown_data(ndo, pptr, "\n\t ", ND_BYTES_AVAILABLE_AFTER(pptr));
1382 }
1383 return;
1384 }
1385
1386 /* now walk the options */
1387 while (li != 0) {
1388 u_int op, opli;
1389 const uint8_t *tptr;
1390
1391 if (li < 2) {
1392 ND_PRINT(", bad opts/li");
1393 return;
1394 }
1395 op = GET_U_1(pptr);
1396 opli = GET_U_1(pptr + 1);
1397 pptr += 2;
1398 li -= 2;
1399 if (opli > li) {
1400 ND_PRINT(", opt (%u) too long", op);
1401 return;
1402 }
1403 li -= opli;
1404 tptr = pptr;
1405
1406 ND_PRINT("\n\t %s Option #%u, length %u, value: ",
1407 tok2str(esis_option_values,"Unknown",op),
1408 op,
1409 opli);
1410
1411 switch (op) {
1412
1413 case ESIS_OPTION_ES_CONF_TIME:
1414 if (opli == 2) {
1415 ND_TCHECK_2(pptr);
1416 ND_PRINT("%us", GET_BE_U_2(tptr));
1417 } else
1418 ND_PRINT("(bad length)");
1419 break;
1420
1421 case ESIS_OPTION_PROTOCOLS:
1422 while (opli>0) {
1423 ND_PRINT("%s (0x%02x)",
1424 tok2str(nlpid_values,
1425 "unknown",
1426 GET_U_1(tptr)),
1427 GET_U_1(tptr));
1428 if (opli>1) /* further NPLIDs ? - put comma */
1429 ND_PRINT(", ");
1430 tptr++;
1431 opli--;
1432 }
1433 break;
1434
1435 /*
1436 * FIXME those are the defined Options that lack a decoder
1437 * you are welcome to contribute code ;-)
1438 */
1439
1440 case ESIS_OPTION_QOS_MAINTENANCE:
1441 case ESIS_OPTION_SECURITY:
1442 case ESIS_OPTION_PRIORITY:
1443 case ESIS_OPTION_ADDRESS_MASK:
1444 case ESIS_OPTION_SNPA_MASK:
1445
1446 default:
1447 print_unknown_data(ndo, tptr, "\n\t ", opli);
1448 break;
1449 }
1450 if (ndo->ndo_vflag > 1)
1451 print_unknown_data(ndo, pptr, "\n\t ", opli);
1452 pptr += opli;
1453 }
1454 return;
1455
1456 trunc:
1457 nd_print_trunc(ndo);
1458 }
1459
1460 static void
1461 isis_print_mcid(netdissect_options *ndo,
1462 const struct isis_spb_mcid *mcid)
1463 {
1464 int i;
1465
1466 ND_TCHECK_SIZE(mcid);
1467 ND_PRINT("ID: %u, Name: ", GET_U_1(mcid->format_id));
1468
1469 nd_printjnp(ndo, mcid->name, sizeof(mcid->name));
1470
1471 ND_PRINT("\n\t Lvl: %u", GET_BE_U_2(mcid->revision_lvl));
1472
1473 ND_PRINT(", Digest: ");
1474
1475 for(i=0;i<16;i++)
1476 ND_PRINT("%.2x ", mcid->digest[i]);
1477 return;
1478
1479 trunc:
1480 nd_print_trunc(ndo);
1481 }
1482
1483 static int
1484 isis_print_mt_port_cap_subtlv(netdissect_options *ndo,
1485 const uint8_t *tptr, u_int len)
1486 {
1487 u_int stlv_type, stlv_len;
1488 const struct isis_subtlv_spb_mcid *subtlv_spb_mcid;
1489 int i;
1490
1491 while (len > 2) {
1492 stlv_type = GET_U_1(tptr);
1493 stlv_len = GET_U_1(tptr + 1);
1494
1495 /* first lets see if we know the subTLVs name*/
1496 ND_PRINT("\n\t %s subTLV #%u, length: %u",
1497 tok2str(isis_mt_port_cap_subtlv_values, "unknown", stlv_type),
1498 stlv_type,
1499 stlv_len);
1500
1501 tptr += 2;
1502 /*len -= TLV_TYPE_LEN_OFFSET;*/
1503 len -= 2;
1504
1505 /* Make sure the subTLV fits within the space left */
1506 if (len < stlv_len)
1507 goto subtlv_too_long;
1508 /* Make sure the entire subTLV is in the captured data */
1509 ND_TCHECK_LEN(tptr, stlv_len);
1510
1511 switch (stlv_type) {
1512 case ISIS_SUBTLV_SPB_MCID:
1513 {
1514 if (stlv_len < ISIS_SUBTLV_SPB_MCID_MIN_LEN)
1515 goto subtlv_too_short;
1516
1517 subtlv_spb_mcid = (const struct isis_subtlv_spb_mcid *)tptr;
1518
1519 ND_PRINT("\n\t MCID: ");
1520 isis_print_mcid(ndo, &(subtlv_spb_mcid->mcid));
1521
1522 /*tptr += SPB_MCID_MIN_LEN;
1523 len -= SPB_MCID_MIN_LEN; */
1524
1525 ND_PRINT("\n\t AUX-MCID: ");
1526 isis_print_mcid(ndo, &(subtlv_spb_mcid->aux_mcid));
1527
1528 /*tptr += SPB_MCID_MIN_LEN;
1529 len -= SPB_MCID_MIN_LEN; */
1530 tptr += ISIS_SUBTLV_SPB_MCID_MIN_LEN;
1531 len -= ISIS_SUBTLV_SPB_MCID_MIN_LEN;
1532 stlv_len -= ISIS_SUBTLV_SPB_MCID_MIN_LEN;
1533
1534 break;
1535 }
1536
1537 case ISIS_SUBTLV_SPB_DIGEST:
1538 {
1539 if (stlv_len < ISIS_SUBTLV_SPB_DIGEST_MIN_LEN)
1540 goto subtlv_too_short;
1541
1542 ND_PRINT("\n\t RES: %u V: %u A: %u D: %u",
1543 (GET_U_1(tptr) >> 5),
1544 ((GET_U_1(tptr) >> 4) & 0x01),
1545 ((GET_U_1(tptr) >> 2) & 0x03),
1546 (GET_U_1(tptr) & 0x03));
1547
1548 tptr++;
1549
1550 ND_PRINT("\n\t Digest: ");
1551
1552 for(i=1;i<=8; i++) {
1553 ND_PRINT("%08x ", GET_BE_U_4(tptr));
1554 if (i%4 == 0 && i != 8)
1555 ND_PRINT("\n\t ");
1556 tptr += 4;
1557 }
1558
1559 len -= ISIS_SUBTLV_SPB_DIGEST_MIN_LEN;
1560 stlv_len -= ISIS_SUBTLV_SPB_DIGEST_MIN_LEN;
1561
1562 break;
1563 }
1564
1565 case ISIS_SUBTLV_SPB_BVID:
1566 {
1567 while (stlv_len != 0) {
1568 if (stlv_len < 4)
1569 goto subtlv_too_short;
1570 ND_PRINT("\n\t ECT: %08x",
1571 GET_BE_U_4(tptr));
1572
1573 tptr += 4;
1574 len -= 4;
1575 stlv_len -= 4;
1576
1577 if (stlv_len < 2)
1578 goto subtlv_too_short;
1579 ND_PRINT(" BVID: %u, U:%01x M:%01x ",
1580 (GET_BE_U_2(tptr) >> 4) ,
1581 (GET_BE_U_2(tptr) >> 3) & 0x01,
1582 (GET_BE_U_2(tptr) >> 2) & 0x01);
1583
1584 tptr += 2;
1585 len -= 2;
1586 stlv_len -= 2;
1587 }
1588
1589 break;
1590 }
1591
1592 default:
1593 break;
1594 }
1595 tptr += stlv_len;
1596 len -= stlv_len;
1597 }
1598 return (0);
1599
1600 trunc:
1601 nd_print_trunc(ndo);
1602 return (1);
1603
1604 subtlv_too_long:
1605 ND_PRINT(" (> containing TLV length)");
1606 return (1);
1607
1608 subtlv_too_short:
1609 ND_PRINT(" (too short)");
1610 return (1);
1611 }
1612
1613 static int
1614 isis_print_mt_capability_subtlv(netdissect_options *ndo,
1615 const uint8_t *tptr, u_int len)
1616 {
1617 u_int stlv_type, stlv_len, treecount;
1618
1619 while (len > 2) {
1620 stlv_type = GET_U_1(tptr);
1621 stlv_len = GET_U_1(tptr + 1);
1622 tptr += 2;
1623 len -= 2;
1624
1625 /* first lets see if we know the subTLVs name*/
1626 ND_PRINT("\n\t %s subTLV #%u, length: %u",
1627 tok2str(isis_mt_capability_subtlv_values, "unknown", stlv_type),
1628 stlv_type,
1629 stlv_len);
1630
1631 /* Make sure the subTLV fits within the space left */
1632 if (len < stlv_len)
1633 goto subtlv_too_long;
1634 /* Make sure the entire subTLV is in the captured data */
1635 ND_TCHECK_LEN(tptr, stlv_len);
1636
1637 switch (stlv_type) {
1638 case ISIS_SUBTLV_SPB_INSTANCE:
1639 if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN)
1640 goto subtlv_too_short;
1641
1642 ND_PRINT("\n\t CIST Root-ID: %08x", GET_BE_U_4(tptr));
1643 tptr += 4;
1644 ND_PRINT(" %08x", GET_BE_U_4(tptr));
1645 tptr += 4;
1646 ND_PRINT(", Path Cost: %08x", GET_BE_U_4(tptr));
1647 tptr += 4;
1648 ND_PRINT(", Prio: %u", GET_BE_U_2(tptr));
1649 tptr += 2;
1650 ND_PRINT("\n\t RES: %u",
1651 GET_BE_U_2(tptr) >> 5);
1652 ND_PRINT(", V: %u",
1653 (GET_BE_U_2(tptr) >> 4) & 0x0001);
1654 ND_PRINT(", SPSource-ID: %u",
1655 (GET_BE_U_4(tptr) & 0x000fffff));
1656 tptr += 4;
1657 ND_PRINT(", No of Trees: %x", GET_U_1(tptr));
1658
1659 treecount = GET_U_1(tptr);
1660 tptr++;
1661
1662 len -= ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN;
1663 stlv_len -= ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN;
1664
1665 while (treecount) {
1666 if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN)
1667 goto trunc;
1668
1669 ND_PRINT("\n\t U:%u, M:%u, A:%u, RES:%u",
1670 GET_U_1(tptr) >> 7,
1671 (GET_U_1(tptr) >> 6) & 0x01,
1672 (GET_U_1(tptr) >> 5) & 0x01,
1673 (GET_U_1(tptr) & 0x1f));
1674
1675 tptr++;
1676
1677 ND_PRINT(", ECT: %08x", GET_BE_U_4(tptr));
1678
1679 tptr += 4;
1680
1681 ND_PRINT(", BVID: %u, SPVID: %u",
1682 (GET_BE_U_3(tptr) >> 12) & 0x000fff,
1683 GET_BE_U_3(tptr) & 0x000fff);
1684
1685 tptr += 3;
1686 len -= ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN;
1687 stlv_len -= ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN;
1688 treecount--;
1689 }
1690
1691 break;
1692
1693 case ISIS_SUBTLV_SPBM_SI:
1694 if (stlv_len < 8)
1695 goto trunc;
1696
1697 ND_PRINT("\n\t BMAC: %08x", GET_BE_U_4(tptr));
1698 tptr += 4;
1699 ND_PRINT("%04x", GET_BE_U_2(tptr));
1700 tptr += 2;
1701
1702 ND_PRINT(", RES: %u, VID: %u", GET_BE_U_2(tptr) >> 12,
1703 (GET_BE_U_2(tptr)) & 0x0fff);
1704
1705 tptr += 2;
1706 len -= 8;
1707 stlv_len -= 8;
1708
1709 while (stlv_len >= 4) {
1710 ND_PRINT("\n\t T: %u, R: %u, RES: %u, ISID: %u",
1711 (GET_BE_U_4(tptr) >> 31),
1712 (GET_BE_U_4(tptr) >> 30) & 0x01,
1713 (GET_BE_U_4(tptr) >> 24) & 0x03f,
1714 (GET_BE_U_4(tptr)) & 0x0ffffff);
1715
1716 tptr += 4;
1717 len -= 4;
1718 stlv_len -= 4;
1719 }
1720
1721 break;
1722
1723 default:
1724 break;
1725 }
1726 tptr += stlv_len;
1727 len -= stlv_len;
1728 }
1729 return (0);
1730
1731 trunc:
1732 nd_print_trunc(ndo);
1733 return (1);
1734
1735 subtlv_too_long:
1736 ND_PRINT(" (> containing TLV length)");
1737 return (1);
1738
1739 subtlv_too_short:
1740 ND_PRINT(" (too short)");
1741 return (1);
1742 }
1743
1744 /* shared routine for printing system, node and lsp-ids */
1745 static char *
1746 isis_print_id(netdissect_options *ndo, const uint8_t *cp, u_int id_len)
1747 {
1748 u_int i;
1749 static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")];
1750 char *pos = id;
1751 u_int sysid_len;
1752
1753 sysid_len = SYSTEM_ID_LEN;
1754 if (sysid_len > id_len)
1755 sysid_len = id_len;
1756 for (i = 1; i <= sysid_len; i++) {
1757 snprintf(pos, sizeof(id) - (pos - id), "%02x", GET_U_1(cp));
1758 cp++;
1759 pos += strlen(pos);
1760 if (i == 2 || i == 4)
1761 *pos++ = '.';
1762 }
1763 if (id_len >= NODE_ID_LEN) {
1764 snprintf(pos, sizeof(id) - (pos - id), ".%02x", GET_U_1(cp));
1765 cp++;
1766 pos += strlen(pos);
1767 }
1768 if (id_len == LSP_ID_LEN)
1769 snprintf(pos, sizeof(id) - (pos - id), "-%02x", GET_U_1(cp));
1770 return (id);
1771 }
1772
1773 /* print the 4-byte metric block which is common found in the old-style TLVs */
1774 static int
1775 isis_print_metric_block(netdissect_options *ndo,
1776 const struct isis_metric_block *isis_metric_block)
1777 {
1778 ND_PRINT(", Default Metric: %u, %s",
1779 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default),
1780 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal");
1781 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay))
1782 ND_PRINT("\n\t\t Delay Metric: %u, %s",
1783 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay),
1784 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal");
1785 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense))
1786 ND_PRINT("\n\t\t Expense Metric: %u, %s",
1787 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense),
1788 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal");
1789 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error))
1790 ND_PRINT("\n\t\t Error Metric: %u, %s",
1791 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error),
1792 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal");
1793
1794 return(1); /* everything is ok */
1795 }
1796
1797 static int
1798 isis_print_tlv_ip_reach(netdissect_options *ndo,
1799 const uint8_t *cp, const char *indent, u_int length)
1800 {
1801 int prefix_len;
1802 const struct isis_tlv_ip_reach *tlv_ip_reach;
1803
1804 tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp;
1805
1806 while (length > 0) {
1807 if ((size_t)length < sizeof(*tlv_ip_reach)) {
1808 ND_PRINT("short IPv4 Reachability (%u vs %zu)",
1809 length,
1810 sizeof(*tlv_ip_reach));
1811 return (0);
1812 }
1813
1814 ND_TCHECK_SIZE(tlv_ip_reach);
1815
1816 prefix_len = mask2plen(GET_IPV4_TO_HOST_ORDER(tlv_ip_reach->mask));
1817
1818 if (prefix_len == -1)
1819 ND_PRINT("%sIPv4 prefix: %s mask %s",
1820 indent,
1821 GET_IPADDR_STRING(tlv_ip_reach->prefix),
1822 GET_IPADDR_STRING(tlv_ip_reach->mask));
1823 else
1824 ND_PRINT("%sIPv4 prefix: %15s/%u",
1825 indent,
1826 GET_IPADDR_STRING(tlv_ip_reach->prefix),
1827 prefix_len);
1828
1829 ND_PRINT(", Distribution: %s, Metric: %u, %s",
1830 ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up",
1831 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default),
1832 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal");
1833
1834 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay))
1835 ND_PRINT("%s Delay Metric: %u, %s",
1836 indent,
1837 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay),
1838 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal");
1839
1840 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense))
1841 ND_PRINT("%s Expense Metric: %u, %s",
1842 indent,
1843 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense),
1844 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal");
1845
1846 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error))
1847 ND_PRINT("%s Error Metric: %u, %s",
1848 indent,
1849 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error),
1850 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal");
1851
1852 length -= sizeof(struct isis_tlv_ip_reach);
1853 tlv_ip_reach++;
1854 }
1855 return (1);
1856 trunc:
1857 return 0;
1858 }
1859
1860 /*
1861 * this is the common IP-REACH subTLV decoder it is called
1862 * from various EXTD-IP REACH TLVs (135,235,236,237)
1863 */
1864
1865 static int
1866 isis_print_ip_reach_subtlv(netdissect_options *ndo,
1867 const uint8_t *tptr, u_int subt, u_int subl,
1868 const char *indent)
1869 {
1870 /* first lets see if we know the subTLVs name*/
1871 ND_PRINT("%s%s subTLV #%u, length: %u",
1872 indent, tok2str(isis_ext_ip_reach_subtlv_values, "unknown", subt),
1873 subt, subl);
1874
1875 ND_TCHECK_LEN(tptr, subl);
1876
1877 switch(subt) {
1878 case ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR: /* fall through */
1879 case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32:
1880 while (subl >= 4) {
1881 ND_PRINT(", 0x%08x (=%u)",
1882 GET_BE_U_4(tptr),
1883 GET_BE_U_4(tptr));
1884 tptr+=4;
1885 subl-=4;
1886 }
1887 break;
1888 case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64:
1889 while (subl >= 8) {
1890 ND_PRINT(", 0x%08x%08x",
1891 GET_BE_U_4(tptr),
1892 GET_BE_U_4(tptr + 4));
1893 tptr+=8;
1894 subl-=8;
1895 }
1896 break;
1897 case ISIS_SUBTLV_EXTD_IP_REACH_PREFIX_SID:
1898 {
1899 uint8_t algo, flags;
1900 uint32_t sid;
1901
1902 flags = GET_U_1(tptr);
1903 algo = GET_U_1(tptr+1);
1904
1905 if (flags & ISIS_PREFIX_SID_FLAG_V) {
1906 if (subl < 5)
1907 goto trunc;
1908 sid = GET_BE_U_3(tptr+2);
1909 tptr+=5;
1910 subl-=5;
1911 } else {
1912 if (subl < 6)
1913 goto trunc;
1914 sid = GET_BE_U_4(tptr+2);
1915 tptr+=6;
1916 subl-=6;
1917 }
1918
1919 ND_PRINT(", Flags [%s], Algo %s (%u), %s %u",
1920 bittok2str(prefix_sid_flag_values, "None", flags),
1921 tok2str(prefix_sid_algo_values, "Unknown", algo), algo,
1922 flags & ISIS_PREFIX_SID_FLAG_V ? "label" : "index",
1923 sid);
1924 }
1925 break;
1926 default:
1927 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl))
1928 return(0);
1929 break;
1930 }
1931 return(1);
1932
1933 trunc:
1934 nd_print_trunc(ndo);
1935 return(0);
1936 }
1937
1938 /*
1939 * this is the common IS-REACH decoder it is called
1940 * from various EXTD-IS REACH style TLVs (22,24,222)
1941 */
1942
1943 static int
1944 isis_print_ext_is_reach(netdissect_options *ndo,
1945 const uint8_t *tptr, const char *indent, u_int tlv_type,
1946 u_int tlv_remaining)
1947 {
1948 char indent_buffer[20];
1949 u_int subtlv_type,subtlv_len,subtlv_sum_len;
1950 int proc_bytes = 0; /* how many bytes did we process ? */
1951 u_int te_class,priority_level,gmpls_switch_cap;
1952 union { /* int to float conversion buffer for several subTLVs */
1953 float f;
1954 uint32_t i;
1955 } bw;
1956
1957 ND_TCHECK_LEN(tptr, NODE_ID_LEN);
1958 if (tlv_remaining < NODE_ID_LEN)
1959 return(0);
1960
1961 ND_PRINT("%sIS Neighbor: %s", indent, isis_print_id(ndo, tptr, NODE_ID_LEN));
1962 tptr+=NODE_ID_LEN;
1963 tlv_remaining-=NODE_ID_LEN;
1964 proc_bytes+=NODE_ID_LEN;
1965
1966 if (tlv_type != ISIS_TLV_IS_ALIAS_ID) { /* the Alias TLV Metric field is implicit 0 */
1967 ND_TCHECK_3(tptr);
1968 if (tlv_remaining < 3)
1969 return(0);
1970 ND_PRINT(", Metric: %u", GET_BE_U_3(tptr));
1971 tptr+=3;
1972 tlv_remaining-=3;
1973 proc_bytes+=3;
1974 }
1975
1976 ND_TCHECK_1(tptr);
1977 if (tlv_remaining < 1)
1978 return(0);
1979 subtlv_sum_len=GET_U_1(tptr); /* read out subTLV length */
1980 tptr++;
1981 tlv_remaining--;
1982 proc_bytes++;
1983 ND_PRINT(", %ssub-TLVs present",subtlv_sum_len ? "" : "no ");
1984 if (subtlv_sum_len) {
1985 ND_PRINT(" (%u)", subtlv_sum_len);
1986 /* prepend the indent string */
1987 snprintf(indent_buffer, sizeof(indent_buffer), "%s ", indent);
1988 indent = indent_buffer;
1989 while (subtlv_sum_len != 0) {
1990 ND_TCHECK_2(tptr);
1991 if (tlv_remaining < 2) {
1992 ND_PRINT("%sRemaining data in TLV shorter than a subTLV header", indent);
1993 proc_bytes += tlv_remaining;
1994 break;
1995 }
1996 if (subtlv_sum_len < 2) {
1997 ND_PRINT("%sRemaining data in subTLVs shorter than a subTLV header", indent);
1998 proc_bytes += subtlv_sum_len;
1999 break;
2000 }
2001 subtlv_type=GET_U_1(tptr);
2002 subtlv_len=GET_U_1(tptr + 1);
2003 tptr += 2;
2004 tlv_remaining -= 2;
2005 subtlv_sum_len -= 2;
2006 proc_bytes += 2;
2007 ND_PRINT("%s%s subTLV #%u, length: %u",
2008 indent, tok2str(isis_ext_is_reach_subtlv_values, "unknown", subtlv_type),
2009 subtlv_type, subtlv_len);
2010
2011 if (subtlv_sum_len < subtlv_len) {
2012 ND_PRINT(" (remaining data in subTLVs shorter than the current subTLV)");
2013 proc_bytes += subtlv_sum_len;
2014 break;
2015 }
2016
2017 if (tlv_remaining < subtlv_len) {
2018 ND_PRINT(" (> remaining tlv length)");
2019 proc_bytes += tlv_remaining;
2020 break;
2021 }
2022
2023 ND_TCHECK_LEN(tptr, subtlv_len);
2024
2025 switch(subtlv_type) {
2026 case ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP:
2027 case ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID:
2028 case ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
2029 if (subtlv_len >= 4) {
2030 ND_PRINT(", 0x%08x", GET_BE_U_4(tptr));
2031 if (subtlv_len == 8) /* rfc4205 */
2032 ND_PRINT(", 0x%08x", GET_BE_U_4(tptr + 4));
2033 }
2034 break;
2035 case ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
2036 case ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
2037 if (subtlv_len >= sizeof(nd_ipv4))
2038 ND_PRINT(", %s", GET_IPADDR_STRING(tptr));
2039 break;
2040 case ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
2041 case ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW:
2042 if (subtlv_len >= 4) {
2043 bw.i = GET_BE_U_4(tptr);
2044 ND_PRINT(", %.3f Mbps", bw.f * 8 / 1000000);
2045 }
2046 break;
2047 case ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
2048 if (subtlv_len >= 32) {
2049 for (te_class = 0; te_class < 8; te_class++) {
2050 bw.i = GET_BE_U_4(tptr);
2051 ND_PRINT("%s TE-Class %u: %.3f Mbps",
2052 indent,
2053 te_class,
2054 bw.f * 8 / 1000000);
2055 tptr += 4;
2056 subtlv_len -= 4;
2057 subtlv_sum_len -= 4;
2058 proc_bytes += 4;
2059 }
2060 }
2061 break;
2062 case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS: /* fall through */
2063 case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD:
2064 if (subtlv_len == 0)
2065 break;
2066 ND_PRINT("%sBandwidth Constraints Model ID: %s (%u)",
2067 indent,
2068 tok2str(diffserv_te_bc_values, "unknown", GET_U_1(tptr)),
2069 GET_U_1(tptr));
2070 tptr++;
2071 subtlv_len--;
2072 subtlv_sum_len--;
2073 proc_bytes++;
2074 /* decode BCs until the subTLV ends */
2075 for (te_class = 0; subtlv_len != 0; te_class++) {
2076 if (subtlv_len < 4)
2077 break;
2078 bw.i = GET_BE_U_4(tptr);
2079 ND_PRINT("%s Bandwidth constraint CT%u: %.3f Mbps",
2080 indent,
2081 te_class,
2082 bw.f * 8 / 1000000);
2083 tptr += 4;
2084 subtlv_len -= 4;
2085 subtlv_sum_len -= 4;
2086 proc_bytes += 4;
2087 }
2088 break;
2089 case ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC:
2090 if (subtlv_len >= 3)
2091 ND_PRINT(", %u", GET_BE_U_3(tptr));
2092 break;
2093 case ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE:
2094 if (subtlv_len == 2) {
2095 ND_PRINT(", [ %s ] (0x%04x)",
2096 bittok2str(isis_subtlv_link_attribute_values,
2097 "Unknown",
2098 GET_BE_U_2(tptr)),
2099 GET_BE_U_2(tptr));
2100 }
2101 break;
2102 case ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
2103 if (subtlv_len >= 2) {
2104 ND_PRINT(", %s, Priority %u",
2105 bittok2str(gmpls_link_prot_values, "none", GET_U_1(tptr)),
2106 GET_U_1(tptr + 1));
2107 }
2108 break;
2109 case ISIS_SUBTLV_SPB_METRIC:
2110 if (subtlv_len >= 6) {
2111 ND_PRINT(", LM: %u", GET_BE_U_3(tptr));
2112 tptr += 3;
2113 subtlv_len -= 3;
2114 subtlv_sum_len -= 3;
2115 proc_bytes += 3;
2116 ND_PRINT(", P: %u", GET_U_1(tptr));
2117 tptr++;
2118 subtlv_len--;
2119 subtlv_sum_len--;
2120 proc_bytes++;
2121 ND_PRINT(", P-ID: %u", GET_BE_U_2(tptr));
2122 }
2123 break;
2124 case ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
2125 if (subtlv_len >= 36) {
2126 gmpls_switch_cap = GET_U_1(tptr);
2127 ND_PRINT("%s Interface Switching Capability:%s",
2128 indent,
2129 tok2str(gmpls_switch_cap_values, "Unknown", gmpls_switch_cap));
2130 ND_PRINT(", LSP Encoding: %s",
2131 tok2str(gmpls_encoding_values, "Unknown", GET_U_1((tptr + 1))));
2132 tptr += 4;
2133 subtlv_len -= 4;
2134 subtlv_sum_len -= 4;
2135 proc_bytes += 4;
2136 ND_PRINT("%s Max LSP Bandwidth:", indent);
2137 for (priority_level = 0; priority_level < 8; priority_level++) {
2138 bw.i = GET_BE_U_4(tptr);
2139 ND_PRINT("%s priority level %u: %.3f Mbps",
2140 indent,
2141 priority_level,
2142 bw.f * 8 / 1000000);
2143 tptr += 4;
2144 subtlv_len -= 4;
2145 subtlv_sum_len -= 4;
2146 proc_bytes += 4;
2147 }
2148 switch (gmpls_switch_cap) {
2149 case GMPLS_PSC1:
2150 case GMPLS_PSC2:
2151 case GMPLS_PSC3:
2152 case GMPLS_PSC4:
2153 if (subtlv_len < 6)
2154 break;
2155 bw.i = GET_BE_U_4(tptr);
2156 ND_PRINT("%s Min LSP Bandwidth: %.3f Mbps", indent, bw.f * 8 / 1000000);
2157 ND_PRINT("%s Interface MTU: %u", indent,
2158 GET_BE_U_2(tptr + 4));
2159 break;
2160 case GMPLS_TSC:
2161 if (subtlv_len < 8)
2162 break;
2163 bw.i = GET_BE_U_4(tptr);
2164 ND_PRINT("%s Min LSP Bandwidth: %.3f Mbps", indent, bw.f * 8 / 1000000);
2165 ND_PRINT("%s Indication %s", indent,
2166 tok2str(gmpls_switch_cap_tsc_indication_values, "Unknown (%u)", GET_U_1((tptr + 4))));
2167 break;
2168 default:
2169 /* there is some optional stuff left to decode but this is as of yet
2170 not specified so just lets hexdump what is left */
2171 if (subtlv_len != 0) {
2172 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subtlv_len))
2173 return(0);
2174 }
2175 }
2176 }
2177 break;
2178 case ISIS_SUBTLV_EXT_IS_REACH_LAN_ADJ_SEGMENT_ID:
2179 if (subtlv_len >= 8) {
2180 ND_PRINT("%s Flags: [%s]", indent,
2181 bittok2str(isis_lan_adj_sid_flag_values,
2182 "none",
2183 GET_U_1(tptr)));
2184 int vflag = (GET_U_1(tptr) & 0x20) ? 1:0;
2185 int lflag = (GET_U_1(tptr) & 0x10) ? 1:0;
2186 tptr++;
2187 subtlv_len--;
2188 subtlv_sum_len--;
2189 proc_bytes++;
2190 ND_PRINT("%s Weight: %u", indent, GET_U_1(tptr));
2191 tptr++;
2192 subtlv_len--;
2193 subtlv_sum_len--;
2194 proc_bytes++;
2195 if(subtlv_len>=SYSTEM_ID_LEN) {
2196 ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN);
2197 ND_PRINT("%s Neighbor System-ID: %s", indent,
2198 isis_print_id(ndo, tptr, SYSTEM_ID_LEN));
2199 }
2200 /* RFC 8667 section 2.2.2 */
2201 /* if V-flag is set to 1 and L-flag is set to 1 ==> 3 octet label */
2202 /* if V-flag is set to 0 and L-flag is set to 0 ==> 4 octet index */
2203 if (vflag && lflag) {
2204 ND_PRINT("%s Label: %u",
2205 indent, GET_BE_U_3(tptr+SYSTEM_ID_LEN));
2206 } else if ((!vflag) && (!lflag)) {
2207 ND_PRINT("%s Index: %u",
2208 indent, GET_BE_U_4(tptr+SYSTEM_ID_LEN));
2209 } else
2210 nd_print_invalid(ndo);
2211 }
2212 break;
2213 default:
2214 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subtlv_len))
2215 return(0);
2216 break;
2217 }
2218
2219 tptr += subtlv_len;
2220 tlv_remaining -= subtlv_len;
2221 subtlv_sum_len -= subtlv_len;
2222 proc_bytes += subtlv_len;
2223 }
2224 }
2225 return(proc_bytes);
2226
2227 trunc:
2228 return(0);
2229 }
2230
2231 /*
2232 * this is the common Multi Topology ID decoder
2233 * it is called from various MT-TLVs (222,229,235,237)
2234 */
2235
2236 static uint8_t
2237 isis_print_mtid(netdissect_options *ndo,
2238 const uint8_t *tptr, const char *indent, u_int tlv_remaining)
2239 {
2240 if (tlv_remaining < 2)
2241 goto trunc;
2242
2243 ND_PRINT("%s%s",
2244 indent,
2245 tok2str(isis_mt_values,
2246 "Reserved for IETF Consensus",
2247 ISIS_MASK_MTID(GET_BE_U_2(tptr))));
2248
2249 ND_PRINT(" Topology (0x%03x), Flags: [%s]",
2250 ISIS_MASK_MTID(GET_BE_U_2(tptr)),
2251 bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(GET_BE_U_2(tptr))));
2252
2253 return(2);
2254 trunc:
2255 return 0;
2256 }
2257
2258 /*
2259 * this is the common extended IP reach decoder
2260 * it is called from TLVs (135,235,236,237)
2261 * we process the TLV and optional subTLVs and return
2262 * the amount of processed bytes
2263 */
2264
2265 static u_int
2266 isis_print_extd_ip_reach(netdissect_options *ndo,
2267 const uint8_t *tptr, const char *indent, uint16_t afi)
2268 {
2269 char indent_buffer[20];
2270 uint8_t prefix[sizeof(nd_ipv6)]; /* shared copy buffer for IPv4 and IPv6 prefixes */
2271 u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen;
2272
2273 metric = GET_BE_U_4(tptr);
2274 processed=4;
2275 tptr+=4;
2276
2277 if (afi == AFNUM_IP) {
2278 status_byte=GET_U_1(tptr);
2279 tptr++;
2280 bit_length = status_byte&0x3f;
2281 if (bit_length > 32) {
2282 ND_PRINT("%sIPv4 prefix: bad bit length %u",
2283 indent,
2284 bit_length);
2285 return (0);
2286 }
2287 processed++;
2288 } else if (afi == AFNUM_IP6) {
2289 status_byte=GET_U_1(tptr);
2290 bit_length=GET_U_1(tptr + 1);
2291 if (bit_length > 128) {
2292 ND_PRINT("%sIPv6 prefix: bad bit length %u",
2293 indent,
2294 bit_length);
2295 return (0);
2296 }
2297 tptr+=2;
2298 processed+=2;
2299 } else
2300 return (0); /* somebody is fooling us */
2301
2302 byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
2303
2304 memset(prefix, 0, sizeof(prefix)); /* clear the copy buffer */
2305 GET_CPY_BYTES(prefix,tptr,byte_length); /* copy as much as is stored in the TLV */
2306 tptr+=byte_length;
2307 processed+=byte_length;
2308
2309 if (afi == AFNUM_IP)
2310 ND_PRINT("%sIPv4 prefix: %15s/%u",
2311 indent,
2312 ipaddr_string(ndo, prefix), /* local buffer, not packet data; don't use GET_IPADDR_STRING() */
2313 bit_length);
2314 else if (afi == AFNUM_IP6)
2315 ND_PRINT("%sIPv6 prefix: %s/%u",
2316 indent,
2317 ip6addr_string(ndo, prefix), /* local buffer, not packet data; don't use GET_IP6ADDR_STRING() */
2318 bit_length);
2319
2320 ND_PRINT(", Distribution: %s, Metric: %u",
2321 ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up",
2322 metric);
2323
2324 if (afi == AFNUM_IP && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
2325 ND_PRINT(", sub-TLVs present");
2326 else if (afi == AFNUM_IP6)
2327 ND_PRINT(", %s%s",
2328 ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal",
2329 ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : "");
2330
2331 if ((afi == AFNUM_IP && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
2332 || (afi == AFNUM_IP6 && ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte))
2333 ) {
2334 /* assume that one prefix can hold more
2335 than one subTLV - therefore the first byte must reflect
2336 the aggregate bytecount of the subTLVs for this prefix
2337 */
2338 sublen=GET_U_1(tptr);
2339 tptr++;
2340 processed+=sublen+1;
2341 ND_PRINT(" (%u)", sublen); /* print out subTLV length */
2342
2343 while (sublen>0) {
2344 subtlvtype=GET_U_1(tptr);
2345 subtlvlen=GET_U_1(tptr + 1);
2346 tptr+=2;
2347 /* prepend the indent string */
2348 snprintf(indent_buffer, sizeof(indent_buffer), "%s ", indent);
2349 if (!isis_print_ip_reach_subtlv(ndo, tptr, subtlvtype, subtlvlen, indent_buffer))
2350 return(0);
2351 tptr+=subtlvlen;
2352 sublen-=(subtlvlen+2);
2353 }
2354 }
2355 return (processed);
2356 }
2357
2358 static void
2359 isis_print_router_cap_subtlv(netdissect_options *ndo, const uint8_t *tptr, uint8_t tlen)
2360 {
2361 uint8_t subt, subl;
2362
2363 while (tlen >= 2) {
2364 subt = GET_U_1(tptr);
2365 subl = GET_U_1(tptr+1);
2366 tlen -= 2;
2367 tptr += 2;
2368
2369 /* first lets see if we know the subTLVs name*/
2370 ND_PRINT("\n\t\t%s subTLV #%u, length: %u",
2371 tok2str(isis_router_capability_subtlv_values, "unknown", subt),
2372 subt, subl);
2373
2374 /*
2375 * Boundary check.
2376 */
2377 if (subl > tlen) {
2378 break;
2379 }
2380 ND_TCHECK_LEN(tptr, subl);
2381
2382 switch (subt) {
2383 case ISIS_SUBTLV_ROUTER_CAP_SR:
2384 {
2385 uint8_t flags, sid_tlen, sid_type, sid_len;
2386 uint32_t range;
2387 const uint8_t *sid_ptr;
2388
2389 flags = GET_U_1(tptr);
2390 range = GET_BE_U_3(tptr+1);
2391 ND_PRINT(", Flags [%s], Range %u",
2392 bittok2str(isis_router_capability_sr_flags, "None", flags),
2393 range);
2394 sid_ptr = tptr + 4;
2395 sid_tlen = subl - 4;
2396
2397 while (sid_tlen >= 5) {
2398 sid_type = GET_U_1(sid_ptr);
2399 sid_len = GET_U_1(sid_ptr+1);
2400 sid_tlen -= 2;
2401 sid_ptr += 2;
2402
2403 /*
2404 * Boundary check.
2405 */
2406 if (sid_len > sid_tlen) {
2407 break;
2408 }
2409
2410 switch (sid_type) {
2411 case 1:
2412 if (sid_len == 3) {
2413 ND_PRINT(", SID value %u", GET_BE_U_3(sid_ptr));
2414 } else if (sid_len == 4) {
2415 ND_PRINT(", SID value %u", GET_BE_U_4(sid_ptr));
2416 } else {
2417 ND_PRINT(", Unknown SID length%u", sid_len);
2418 }
2419 break;
2420 default:
2421 print_unknown_data(ndo, sid_ptr, "\n\t\t ", sid_len);
2422 }
2423
2424 sid_ptr += sid_len;
2425 sid_tlen -= sid_len;
2426 }
2427 }
2428 break;
2429 default:
2430 print_unknown_data(ndo, tptr, "\n\t\t", subl);
2431 break;
2432 }
2433
2434 tlen -= subl;
2435 tptr += subl;
2436 }
2437 trunc:
2438 return;
2439 }
2440
2441 /*
2442 * Clear checksum and lifetime prior to signature verification.
2443 */
2444 static void
2445 isis_clear_checksum_lifetime(void *header)
2446 {
2447 struct isis_lsp_header *header_lsp = (struct isis_lsp_header *) header;
2448
2449 header_lsp->checksum[0] = 0;
2450 header_lsp->checksum[1] = 0;
2451 header_lsp->remaining_lifetime[0] = 0;
2452 header_lsp->remaining_lifetime[1] = 0;
2453 }
2454
2455 /*
2456 * isis_print
2457 * Decode IS-IS packets. Return 0 on error.
2458 */
2459
2460 #define INVALID_OR_DECREMENT(length,decr) \
2461 if ((length) < (decr)) { \
2462 ND_PRINT(" [packet length %u < %zu]", (length), (decr)); \
2463 nd_print_invalid(ndo); \
2464 return 1; \
2465 } \
2466 length -= (decr);
2467
2468 static int
2469 isis_print(netdissect_options *ndo,
2470 const uint8_t *p, u_int length)
2471 {
2472 const struct isis_common_header *isis_header;
2473
2474 const struct isis_iih_lan_header *header_iih_lan;
2475 const struct isis_iih_ptp_header *header_iih_ptp;
2476 const struct isis_lsp_header *header_lsp;
2477 const struct isis_csnp_header *header_csnp;
2478 const struct isis_psnp_header *header_psnp;
2479
2480 const struct isis_tlv_lsp *tlv_lsp;
2481 const struct isis_tlv_ptp_adj *tlv_ptp_adj;
2482 const struct isis_tlv_is_reach *tlv_is_reach;
2483 const struct isis_tlv_es_reach *tlv_es_reach;
2484
2485 uint8_t version, pdu_version, fixed_len;
2486 uint8_t pdu_type, pdu_max_area, max_area, pdu_id_length, id_length, tlv_type, tlv_len, tlen, alen, prefix_len;
2487 u_int ext_is_len, ext_ip_len;
2488 uint8_t mt_len;
2489 uint8_t isis_subtlv_idrp;
2490 const uint8_t *optr, *pptr, *tptr;
2491 u_int packet_len;
2492 u_short pdu_len, key_id;
2493 u_int i,vendor_id, num_vals;
2494 uint8_t auth_type;
2495 uint8_t num_system_ids;
2496 int sigcheck;
2497
2498 ndo->ndo_protocol = "isis";
2499 packet_len=length;
2500 optr = p; /* initialize the _o_riginal pointer to the packet start -
2501 need it for parsing the checksum TLV and authentication
2502 TLV verification */
2503 isis_header = (const struct isis_common_header *)p;
2504 ND_TCHECK_SIZE(isis_header);
2505 if (length < ISIS_COMMON_HEADER_SIZE)
2506 goto trunc;
2507 pptr = p+(ISIS_COMMON_HEADER_SIZE);
2508 header_iih_lan = (const struct isis_iih_lan_header *)pptr;
2509 header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
2510 header_lsp = (const struct isis_lsp_header *)pptr;
2511 header_csnp = (const struct isis_csnp_header *)pptr;
2512 header_psnp = (const struct isis_psnp_header *)pptr;
2513
2514 if (!ndo->ndo_eflag)
2515 ND_PRINT("IS-IS");
2516
2517 /*
2518 * Sanity checking of the header.
2519 */
2520
2521 version = GET_U_1(isis_header->version);
2522 if (version != ISIS_VERSION) {
2523 ND_PRINT("version %u packet not supported", version);
2524 return (0);
2525 }
2526
2527 pdu_id_length = GET_U_1(isis_header->id_length);
2528 if ((pdu_id_length != SYSTEM_ID_LEN) && (pdu_id_length != 0)) {
2529 ND_PRINT("system ID length of %u is not supported",
2530 pdu_id_length);
2531 return (0);
2532 }
2533
2534 pdu_version = GET_U_1(isis_header->pdu_version);
2535 if (pdu_version != ISIS_VERSION) {
2536 ND_PRINT("version %u packet not supported", pdu_version);
2537 return (0);
2538 }
2539
2540 fixed_len = GET_U_1(isis_header->fixed_len);
2541 if (length < fixed_len) {
2542 ND_PRINT("fixed header length %u > packet length %u", fixed_len, length);
2543 return (0);
2544 }
2545
2546 if (fixed_len < ISIS_COMMON_HEADER_SIZE) {
2547 ND_PRINT("fixed header length %u < minimum header size %u", fixed_len, (u_int)ISIS_COMMON_HEADER_SIZE);
2548 return (0);
2549 }
2550
2551 pdu_max_area = GET_U_1(isis_header->max_area);
2552 switch(pdu_max_area) {
2553 case 0:
2554 max_area = 3; /* silly shit */
2555 break;
2556 case 255:
2557 ND_PRINT("bad packet -- 255 areas");
2558 return (0);
2559 default:
2560 max_area = pdu_max_area;
2561 break;
2562 }
2563
2564 switch(pdu_id_length) {
2565 case 0:
2566 id_length = 6; /* silly shit again */
2567 break;
2568 case 1: /* 1-8 are valid sys-ID lengths */
2569 case 2:
2570 case 3:
2571 case 4:
2572 case 5:
2573 case 6:
2574 case 7:
2575 case 8:
2576 id_length = pdu_id_length;
2577 break;
2578 case 255:
2579 id_length = 0; /* entirely useless */
2580 break;
2581 default:
2582 id_length = pdu_id_length;
2583 break;
2584 }
2585
2586 /* toss any non 6-byte sys-ID len PDUs */
2587 if (id_length != 6 ) {
2588 ND_PRINT("bad packet -- illegal sys-ID length (%u)", id_length);
2589 return (0);
2590 }
2591
2592 pdu_type = GET_U_1(isis_header->pdu_type);
2593
2594 /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/
2595 if (ndo->ndo_vflag == 0) {
2596 ND_PRINT("%s%s",
2597 ndo->ndo_eflag ? "" : ", ",
2598 tok2str(isis_pdu_values, "unknown PDU-Type %u", pdu_type));
2599 } else {
2600 /* ok they seem to want to know everything - lets fully decode it */
2601 ND_PRINT("%slength %u", ndo->ndo_eflag ? "" : ", ", length);
2602
2603 ND_PRINT("\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)",
2604 tok2str(isis_pdu_values,
2605 "unknown, type %u",
2606 pdu_type),
2607 fixed_len,
2608 version,
2609 pdu_version,
2610 id_length,
2611 pdu_id_length,
2612 max_area,
2613 pdu_max_area);
2614
2615 if (ndo->ndo_vflag > 1) {
2616 if (!print_unknown_data(ndo, optr, "\n\t", 8)) /* provide the _o_riginal pointer */
2617 return (0); /* for optionally debugging the common header */
2618 }
2619 }
2620
2621 switch (pdu_type) {
2622
2623 case ISIS_PDU_L1_LAN_IIH:
2624 case ISIS_PDU_L2_LAN_IIH:
2625 if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) {
2626 ND_PRINT(", bogus fixed header length %u should be %zu",
2627 fixed_len, ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
2628 return (0);
2629 }
2630 ND_TCHECK_SIZE(header_iih_lan);
2631 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)
2632 goto trunc;
2633 if (ndo->ndo_vflag == 0) {
2634 ND_PRINT(", src-id %s",
2635 isis_print_id(ndo, header_iih_lan->source_id, SYSTEM_ID_LEN));
2636 ND_PRINT(", lan-id %s, prio %u",
2637 isis_print_id(ndo, header_iih_lan->lan_id,NODE_ID_LEN),
2638 GET_U_1(header_iih_lan->priority));
2639 ND_PRINT(", length %u", length);
2640 return (1);
2641 }
2642 pdu_len=GET_BE_U_2(header_iih_lan->pdu_len);
2643 if (packet_len>pdu_len) {
2644 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2645 length=pdu_len;
2646 }
2647
2648 ND_PRINT("\n\t source-id: %s, holding time: %us, Flags: [%s]",
2649 isis_print_id(ndo, header_iih_lan->source_id,SYSTEM_ID_LEN),
2650 GET_BE_U_2(header_iih_lan->holding_time),
2651 tok2str(isis_iih_circuit_type_values,
2652 "unknown circuit type 0x%02x",
2653 GET_U_1(header_iih_lan->circuit_type)));
2654
2655 ND_PRINT("\n\t lan-id: %s, Priority: %u, PDU length: %u",
2656 isis_print_id(ndo, header_iih_lan->lan_id, NODE_ID_LEN),
2657 GET_U_1(header_iih_lan->priority) & ISIS_LAN_PRIORITY_MASK,
2658 pdu_len);
2659
2660 if (ndo->ndo_vflag > 1) {
2661 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_LAN_HEADER_SIZE))
2662 return (0);
2663 }
2664
2665 INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
2666 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
2667 break;
2668
2669 case ISIS_PDU_PTP_IIH:
2670 if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) {
2671 ND_PRINT(", bogus fixed header length %u should be %zu",
2672 fixed_len, ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
2673 return (0);
2674 }
2675 ND_TCHECK_SIZE(header_iih_ptp);
2676 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)
2677 goto trunc;
2678 if (ndo->ndo_vflag == 0) {
2679 ND_PRINT(", src-id %s", isis_print_id(ndo, header_iih_ptp->source_id, SYSTEM_ID_LEN));
2680 ND_PRINT(", length %u", length);
2681 return (1);
2682 }
2683 pdu_len=GET_BE_U_2(header_iih_ptp->pdu_len);
2684 if (packet_len>pdu_len) {
2685 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2686 length=pdu_len;
2687 }
2688
2689 ND_PRINT("\n\t source-id: %s, holding time: %us, Flags: [%s]",
2690 isis_print_id(ndo, header_iih_ptp->source_id,SYSTEM_ID_LEN),
2691 GET_BE_U_2(header_iih_ptp->holding_time),
2692 tok2str(isis_iih_circuit_type_values,
2693 "unknown circuit type 0x%02x",
2694 GET_U_1(header_iih_ptp->circuit_type)));
2695
2696 ND_PRINT("\n\t circuit-id: 0x%02x, PDU length: %u",
2697 GET_U_1(header_iih_ptp->circuit_id),
2698 pdu_len);
2699
2700 if (ndo->ndo_vflag > 1) {
2701 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_PTP_HEADER_SIZE))
2702 return (0);
2703 }
2704 INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
2705 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
2706 break;
2707
2708 case ISIS_PDU_L1_LSP:
2709 case ISIS_PDU_L2_LSP:
2710 if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) {
2711 ND_PRINT(", bogus fixed header length %u should be %zu",
2712 fixed_len, ISIS_LSP_HEADER_SIZE);
2713 return (0);
2714 }
2715 ND_TCHECK_SIZE(header_lsp);
2716 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)
2717 goto trunc;
2718 if (ndo->ndo_vflag == 0) {
2719 ND_PRINT(", lsp-id %s, seq 0x%08x, lifetime %5us",
2720 isis_print_id(ndo, header_lsp->lsp_id, LSP_ID_LEN),
2721 GET_BE_U_4(header_lsp->sequence_number),
2722 GET_BE_U_2(header_lsp->remaining_lifetime));
2723 ND_PRINT(", length %u", length);
2724 return (1);
2725 }
2726 pdu_len=GET_BE_U_2(header_lsp->pdu_len);
2727 if (packet_len>pdu_len) {
2728 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2729 length=pdu_len;
2730 }
2731
2732 ND_PRINT("\n\t lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t chksum: 0x%04x",
2733 isis_print_id(ndo, header_lsp->lsp_id, LSP_ID_LEN),
2734 GET_BE_U_4(header_lsp->sequence_number),
2735 GET_BE_U_2(header_lsp->remaining_lifetime),
2736 GET_BE_U_2(header_lsp->checksum));
2737
2738 osi_print_cksum(ndo, (const uint8_t *)header_lsp->lsp_id,
2739 GET_BE_U_2(header_lsp->checksum),
2740 12, length-12);
2741
2742 ND_PRINT(", PDU length: %u, Flags: [ %s",
2743 pdu_len,
2744 ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : "");
2745
2746 if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) {
2747 ND_PRINT("%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : "");
2748 ND_PRINT("%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : "");
2749 ND_PRINT("%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : "");
2750 ND_PRINT("%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : "");
2751 ND_PRINT("ATT bit set, ");
2752 }
2753 ND_PRINT("%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : "");
2754 ND_PRINT("%s ]", tok2str(isis_lsp_istype_values, "Unknown(0x%x)",
2755 ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)));
2756
2757 if (ndo->ndo_vflag > 1) {
2758 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_LSP_HEADER_SIZE))
2759 return (0);
2760 }
2761
2762 INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
2763 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
2764 break;
2765
2766 case ISIS_PDU_L1_CSNP:
2767 case ISIS_PDU_L2_CSNP:
2768 if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) {
2769 ND_PRINT(", bogus fixed header length %u should be %zu",
2770 fixed_len, ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
2771 return (0);
2772 }
2773 ND_TCHECK_SIZE(header_csnp);
2774 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)
2775 goto trunc;
2776 if (ndo->ndo_vflag == 0) {
2777 ND_PRINT(", src-id %s", isis_print_id(ndo, header_csnp->source_id, NODE_ID_LEN));
2778 ND_PRINT(", length %u", length);
2779 return (1);
2780 }
2781 pdu_len=GET_BE_U_2(header_csnp->pdu_len);
2782 if (packet_len>pdu_len) {
2783 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2784 length=pdu_len;
2785 }
2786
2787 ND_PRINT("\n\t source-id: %s, PDU length: %u",
2788 isis_print_id(ndo, header_csnp->source_id, NODE_ID_LEN),
2789 pdu_len);
2790 ND_PRINT("\n\t start lsp-id: %s",
2791 isis_print_id(ndo, header_csnp->start_lsp_id, LSP_ID_LEN));
2792 ND_PRINT("\n\t end lsp-id: %s",
2793 isis_print_id(ndo, header_csnp->end_lsp_id, LSP_ID_LEN));
2794
2795 if (ndo->ndo_vflag > 1) {
2796 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_CSNP_HEADER_SIZE))
2797 return (0);
2798 }
2799
2800 INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
2801 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
2802 break;
2803
2804 case ISIS_PDU_L1_PSNP:
2805 case ISIS_PDU_L2_PSNP:
2806 if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) {
2807 ND_PRINT("- bogus fixed header length %u should be %zu",
2808 fixed_len, ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
2809 return (0);
2810 }
2811 ND_TCHECK_SIZE(header_psnp);
2812 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)
2813 goto trunc;
2814 if (ndo->ndo_vflag == 0) {
2815 ND_PRINT(", src-id %s", isis_print_id(ndo, header_psnp->source_id, NODE_ID_LEN));
2816 ND_PRINT(", length %u", length);
2817 return (1);
2818 }
2819 pdu_len=GET_BE_U_2(header_psnp->pdu_len);
2820 if (packet_len>pdu_len) {
2821 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2822 length=pdu_len;
2823 }
2824
2825 ND_PRINT("\n\t source-id: %s, PDU length: %u",
2826 isis_print_id(ndo, header_psnp->source_id, NODE_ID_LEN),
2827 pdu_len);
2828
2829 if (ndo->ndo_vflag > 1) {
2830 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_PSNP_HEADER_SIZE))
2831 return (0);
2832 }
2833
2834 INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
2835 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
2836 break;
2837
2838 default:
2839 if (ndo->ndo_vflag == 0) {
2840 ND_PRINT(", length %u", length);
2841 return (1);
2842 }
2843 (void)print_unknown_data(ndo, pptr, "\n\t ", length);
2844 return (0);
2845 }
2846
2847 /*
2848 * Now print the TLV's.
2849 */
2850
2851 while (packet_len > 0) {
2852 ND_TCHECK_2(pptr);
2853 if (packet_len < 2)
2854 goto trunc;
2855 tlv_type = GET_U_1(pptr);
2856 tlv_len = GET_U_1(pptr + 1);
2857 pptr += 2;
2858 packet_len -= 2;
2859 tlen = tlv_len; /* copy temporary len & pointer to packet data */
2860 tptr = pptr;
2861
2862 /* first lets see if we know the TLVs name*/
2863 ND_PRINT("\n\t %s TLV #%u, length: %u",
2864 tok2str(isis_tlv_values,
2865 "unknown",
2866 tlv_type),
2867 tlv_type,
2868 tlv_len);
2869
2870 if (packet_len < tlv_len)
2871 goto trunc;
2872
2873 /* now check if we have a decoder otherwise do a hexdump at the end*/
2874 switch (tlv_type) {
2875 case ISIS_TLV_AREA_ADDR:
2876 while (tlen != 0) {
2877 alen = GET_U_1(tptr);
2878 tptr++;
2879 tlen--;
2880 if (tlen < alen)
2881 goto tlv_trunc;
2882 ND_PRINT("\n\t Area address (length: %u): %s",
2883 alen,
2884 GET_ISONSAP_STRING(tptr, alen));
2885 tptr += alen;
2886 tlen -= alen;
2887 }
2888 break;
2889 case ISIS_TLV_ISNEIGH:
2890 while (tlen != 0) {
2891 if (tlen < MAC_ADDR_LEN)
2892 goto tlv_trunc;
2893 ND_TCHECK_LEN(tptr, MAC_ADDR_LEN);
2894 ND_PRINT("\n\t SNPA: %s", isis_print_id(ndo, tptr, MAC_ADDR_LEN));
2895 tlen -= MAC_ADDR_LEN;
2896 tptr += MAC_ADDR_LEN;
2897 }
2898 break;
2899
2900 case ISIS_TLV_INSTANCE_ID:
2901 if (tlen < 4)
2902 goto tlv_trunc;
2903 num_vals = (tlen-2)/2;
2904 ND_PRINT("\n\t Instance ID: %u, ITIDs(%u)%s ",
2905 GET_BE_U_2(tptr), num_vals,
2906 num_vals ? ":" : "");
2907 tptr += 2;
2908 tlen -= 2;
2909 for (i=0; i < num_vals; i++) {
2910 ND_PRINT("%u", GET_BE_U_2(tptr));
2911 if (i < (num_vals - 1)) {
2912 ND_PRINT(", ");
2913 }
2914 tptr += 2;
2915 tlen -= 2;
2916 }
2917 break;
2918
2919 case ISIS_TLV_PADDING:
2920 break;
2921
2922 case ISIS_TLV_MT_IS_REACH:
2923 mt_len = isis_print_mtid(ndo, tptr, "\n\t ", tlen);
2924 if (mt_len == 0) /* did something go wrong ? */
2925 goto trunc;
2926 tptr+=mt_len;
2927 tlen-=mt_len;
2928 while (tlen != 0) {
2929 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type, tlen);
2930 if (ext_is_len == 0) /* did something go wrong ? */
2931 goto trunc;
2932 if (tlen < ext_is_len) {
2933 ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_is_len);
2934 nd_print_invalid(ndo);
2935 break;
2936 }
2937 tlen-=(uint8_t)ext_is_len;
2938 tptr+=(uint8_t)ext_is_len;
2939 }
2940 break;
2941
2942 case ISIS_TLV_IS_ALIAS_ID:
2943 while (tlen != 0) {
2944 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type, tlen);
2945 if (ext_is_len == 0) /* did something go wrong ? */
2946 goto trunc;
2947 if (tlen < ext_is_len) {
2948 ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_is_len);
2949 nd_print_invalid(ndo);
2950 break;
2951 }
2952 tlen-=(uint8_t)ext_is_len;
2953 tptr+=(uint8_t)ext_is_len;
2954 }
2955 break;
2956
2957 case ISIS_TLV_EXT_IS_REACH:
2958 while (tlen != 0) {
2959 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type, tlen);
2960 if (ext_is_len == 0) /* did something go wrong ? */
2961 goto trunc;
2962 if (tlen < ext_is_len) {
2963 ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_is_len);
2964 nd_print_invalid(ndo);
2965 break;
2966 }
2967 tlen-=(uint8_t)ext_is_len;
2968 tptr+=(uint8_t)ext_is_len;
2969 }
2970 break;
2971 case ISIS_TLV_IS_REACH:
2972 if (tlen < 1)
2973 goto tlv_trunc;
2974 ND_PRINT("\n\t %s",
2975 tok2str(isis_is_reach_virtual_values,
2976 "bogus virtual flag 0x%02x",
2977 GET_U_1(tptr)));
2978 tptr++;
2979 tlen--;
2980 tlv_is_reach = (const struct isis_tlv_is_reach *)tptr;
2981 while (tlen != 0) {
2982 if (tlen < sizeof(struct isis_tlv_is_reach))
2983 goto tlv_trunc;
2984 ND_TCHECK_SIZE(tlv_is_reach);
2985 ND_PRINT("\n\t IS Neighbor: %s",
2986 isis_print_id(ndo, tlv_is_reach->neighbor_nodeid, NODE_ID_LEN));
2987 isis_print_metric_block(ndo, &tlv_is_reach->isis_metric_block);
2988 tlen -= sizeof(struct isis_tlv_is_reach);
2989 tlv_is_reach++;
2990 }
2991 break;
2992
2993 case ISIS_TLV_ESNEIGH:
2994 tlv_es_reach = (const struct isis_tlv_es_reach *)tptr;
2995 while (tlen != 0) {
2996 if (tlen < sizeof(struct isis_tlv_es_reach))
2997 goto tlv_trunc;
2998 ND_TCHECK_SIZE(tlv_es_reach);
2999 ND_PRINT("\n\t ES Neighbor: %s",
3000 isis_print_id(ndo, tlv_es_reach->neighbor_sysid, SYSTEM_ID_LEN));
3001 isis_print_metric_block(ndo, &tlv_es_reach->isis_metric_block);
3002 tlen -= sizeof(struct isis_tlv_es_reach);
3003 tlv_es_reach++;
3004 }
3005 break;
3006
3007 /* those two TLVs share the same format */
3008 case ISIS_TLV_INT_IP_REACH:
3009 case ISIS_TLV_EXT_IP_REACH:
3010 if (!isis_print_tlv_ip_reach(ndo, pptr, "\n\t ", tlv_len))
3011 return (1);
3012 break;
3013
3014 case ISIS_TLV_EXTD_IP_REACH:
3015 while (tlen != 0) {
3016 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AFNUM_IP);
3017 if (ext_ip_len == 0) /* did something go wrong ? */
3018 goto trunc;
3019 if (tlen < ext_ip_len) {
3020 ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_ip_len);
3021 nd_print_invalid(ndo);
3022 break;
3023 }
3024 tlen-=(uint8_t)ext_ip_len;
3025 tptr+=(uint8_t)ext_ip_len;
3026 }
3027 break;
3028
3029 case ISIS_TLV_MT_IP_REACH:
3030 mt_len = isis_print_mtid(ndo, tptr, "\n\t ", tlen);
3031 if (mt_len == 0) { /* did something go wrong ? */
3032 goto trunc;
3033 }
3034 tptr+=mt_len;
3035 tlen-=mt_len;
3036
3037 while (tlen != 0) {
3038 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AFNUM_IP);
3039 if (ext_ip_len == 0) /* did something go wrong ? */
3040 goto trunc;
3041 if (tlen < ext_ip_len) {
3042 ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_ip_len);
3043 nd_print_invalid(ndo);
3044 break;
3045 }
3046 tlen-=(uint8_t)ext_ip_len;
3047 tptr+=(uint8_t)ext_ip_len;
3048 }
3049 break;
3050
3051 case ISIS_TLV_IP6_REACH:
3052 while (tlen != 0) {
3053 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AFNUM_IP6);
3054 if (ext_ip_len == 0) /* did something go wrong ? */
3055 goto trunc;
3056 if (tlen < ext_ip_len) {
3057 ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_ip_len);
3058 nd_print_invalid(ndo);
3059 break;
3060 }
3061 tlen-=(uint8_t)ext_ip_len;
3062 tptr+=(uint8_t)ext_ip_len;
3063 }
3064 break;
3065
3066 case ISIS_TLV_MT_IP6_REACH:
3067 mt_len = isis_print_mtid(ndo, tptr, "\n\t ", tlen);
3068 if (mt_len == 0) { /* did something go wrong ? */
3069 goto trunc;
3070 }
3071 tptr+=mt_len;
3072 tlen-=mt_len;
3073
3074 while (tlen != 0) {
3075 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AFNUM_IP6);
3076 if (ext_ip_len == 0) /* did something go wrong ? */
3077 goto trunc;
3078 if (tlen < ext_ip_len) {
3079 ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_ip_len);
3080 nd_print_invalid(ndo);
3081 break;
3082 }
3083 tlen-=(uint8_t)ext_ip_len;
3084 tptr+=(uint8_t)ext_ip_len;
3085 }
3086 break;
3087
3088 case ISIS_TLV_IP6ADDR:
3089 while (tlen != 0) {
3090 if (tlen < sizeof(nd_ipv6))
3091 goto tlv_trunc;
3092 ND_PRINT("\n\t IPv6 interface address: %s",
3093 GET_IP6ADDR_STRING(tptr));
3094
3095 tptr += sizeof(nd_ipv6);
3096 tlen -= sizeof(nd_ipv6);
3097 }
3098 break;
3099 case ISIS_TLV_AUTH:
3100 if (tlen < 1)
3101 goto tlv_trunc;
3102 auth_type = GET_U_1(tptr);
3103 tptr++;
3104 tlen--;
3105
3106 ND_PRINT("\n\t %s: ",
3107 tok2str(isis_subtlv_auth_values,
3108 "unknown Authentication type 0x%02x",
3109 auth_type));
3110
3111 switch (auth_type) {
3112 case ISIS_SUBTLV_AUTH_SIMPLE:
3113 nd_printjnp(ndo, tptr, tlen);
3114 break;
3115 case ISIS_SUBTLV_AUTH_MD5:
3116 for(i=0;i<tlen;i++) {
3117 ND_PRINT("%02x", GET_U_1(tptr + i));
3118 }
3119 if (tlen != ISIS_SUBTLV_AUTH_MD5_LEN)
3120 ND_PRINT(", (invalid subTLV) ");
3121
3122 sigcheck = signature_verify(ndo, optr, length, tptr,
3123 isis_clear_checksum_lifetime,
3124 header_lsp);
3125 ND_PRINT(" (%s)", tok2str(signature_check_values, "Unknown", sigcheck));
3126
3127 break;
3128 case ISIS_SUBTLV_AUTH_GENERIC:
3129 if (tlen < 2)
3130 goto tlv_trunc;
3131 key_id = GET_BE_U_2(tptr);
3132 ND_PRINT("%u, password: ", key_id);
3133 tptr += 2;
3134 tlen -= 2;
3135 for(i=0;i<tlen;i++) {
3136 ND_PRINT("%02x", GET_U_1(tptr + i));
3137 }
3138 break;
3139 case ISIS_SUBTLV_AUTH_PRIVATE:
3140 default:
3141 if (!print_unknown_data(ndo, tptr, "\n\t\t ", tlen))
3142 return(0);
3143 break;
3144 }
3145 break;
3146
3147 case ISIS_TLV_PTP_ADJ:
3148 tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr;
3149 if(tlen>=1) {
3150 ND_PRINT("\n\t Adjacency State: %s (%u)",
3151 tok2str(isis_ptp_adjancey_values, "unknown", GET_U_1(tptr)),
3152 GET_U_1(tptr));
3153 tlen--;
3154 }
3155 if(tlen>sizeof(tlv_ptp_adj->extd_local_circuit_id)) {
3156 ND_PRINT("\n\t Extended Local circuit-ID: 0x%08x",
3157 GET_BE_U_4(tlv_ptp_adj->extd_local_circuit_id));
3158 tlen-=sizeof(tlv_ptp_adj->extd_local_circuit_id);
3159 }
3160 if(tlen>=SYSTEM_ID_LEN) {
3161 ND_TCHECK_LEN(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN);
3162 ND_PRINT("\n\t Neighbor System-ID: %s",
3163 isis_print_id(ndo, tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN));
3164 tlen-=SYSTEM_ID_LEN;
3165 }
3166 if(tlen>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) {
3167 ND_PRINT("\n\t Neighbor Extended Local circuit-ID: 0x%08x",
3168 GET_BE_U_4(tlv_ptp_adj->neighbor_extd_local_circuit_id));
3169 }
3170 break;
3171
3172 case ISIS_TLV_PROTOCOLS:
3173 ND_PRINT("\n\t NLPID(s): ");
3174 while (tlen != 0) {
3175 ND_PRINT("%s (0x%02x)",
3176 tok2str(nlpid_values,
3177 "unknown",
3178 GET_U_1(tptr)),
3179 GET_U_1(tptr));
3180 if (tlen>1) /* further NPLIDs ? - put comma */
3181 ND_PRINT(", ");
3182 tptr++;
3183 tlen--;
3184 }
3185 break;
3186
3187 case ISIS_TLV_MT_PORT_CAP:
3188 {
3189 if (tlen < 2)
3190 goto tlv_trunc;
3191
3192 ND_PRINT("\n\t RES: %u, MTID(s): %u",
3193 (GET_BE_U_2(tptr) >> 12),
3194 (GET_BE_U_2(tptr) & 0x0fff));
3195
3196 tptr += 2;
3197 tlen -= 2;
3198
3199 if (tlen)
3200 isis_print_mt_port_cap_subtlv(ndo, tptr, tlen);
3201
3202 break;
3203 }
3204
3205 case ISIS_TLV_MT_CAPABILITY:
3206 if (tlen < 2)
3207 goto tlv_trunc;
3208
3209 ND_PRINT("\n\t O: %u, RES: %u, MTID(s): %u",
3210 (GET_BE_U_2(tptr) >> 15) & 0x01,
3211 (GET_BE_U_2(tptr) >> 12) & 0x07,
3212 GET_BE_U_2(tptr) & 0x0fff);
3213
3214 tptr += 2;
3215 tlen -= 2;
3216
3217 if (tlen)
3218 isis_print_mt_capability_subtlv(ndo, tptr, tlen);
3219
3220 break;
3221
3222 case ISIS_TLV_TE_ROUTER_ID:
3223 if (tlen < sizeof(nd_ipv4))
3224 goto tlv_trunc;
3225 ND_PRINT("\n\t Traffic Engineering Router ID: %s", GET_IPADDR_STRING(pptr));
3226 break;
3227
3228 case ISIS_TLV_IPADDR:
3229 while (tlen != 0) {
3230 if (tlen < sizeof(nd_ipv4))
3231 goto tlv_trunc;
3232 ND_PRINT("\n\t IPv4 interface address: %s", GET_IPADDR_STRING(tptr));
3233 tptr += sizeof(nd_ipv4);
3234 tlen -= sizeof(nd_ipv4);
3235 }
3236 break;
3237
3238 case ISIS_TLV_HOSTNAME:
3239 ND_PRINT("\n\t Hostname: ");
3240 nd_printjnp(ndo, tptr, tlen);
3241 break;
3242
3243 case ISIS_TLV_SHARED_RISK_GROUP:
3244 if (tlen < NODE_ID_LEN)
3245 break;
3246 ND_TCHECK_LEN(tptr, NODE_ID_LEN);
3247 ND_PRINT("\n\t IS Neighbor: %s", isis_print_id(ndo, tptr, NODE_ID_LEN));
3248 tptr+=NODE_ID_LEN;
3249 tlen-=NODE_ID_LEN;
3250
3251 if (tlen < 1)
3252 break;
3253 ND_PRINT(", Flags: [%s]",
3254 ISIS_MASK_TLV_SHARED_RISK_GROUP(GET_U_1(tptr)) ? "numbered" : "unnumbered");
3255 tptr++;
3256 tlen--;
3257
3258 if (tlen < sizeof(nd_ipv4))
3259 break;
3260 ND_PRINT("\n\t IPv4 interface address: %s", GET_IPADDR_STRING(tptr));
3261 tptr+=sizeof(nd_ipv4);
3262 tlen-=sizeof(nd_ipv4);
3263
3264 if (tlen < sizeof(nd_ipv4))
3265 break;
3266 ND_PRINT("\n\t IPv4 neighbor address: %s", GET_IPADDR_STRING(tptr));
3267 tptr+=sizeof(nd_ipv4);
3268 tlen-=sizeof(nd_ipv4);
3269
3270 while (tlen != 0) {
3271 if (tlen < 4)
3272 goto tlv_trunc;
3273 ND_PRINT("\n\t Link-ID: 0x%08x", GET_BE_U_4(tptr));
3274 tptr+=4;
3275 tlen-=4;
3276 }
3277 break;
3278
3279 case ISIS_TLV_LSP:
3280 tlv_lsp = (const struct isis_tlv_lsp *)tptr;
3281 while (tlen != 0) {
3282 if (tlen < sizeof(struct isis_tlv_lsp))
3283 goto tlv_trunc;
3284 ND_TCHECK_1(tlv_lsp->lsp_id + LSP_ID_LEN - 1);
3285 ND_PRINT("\n\t lsp-id: %s",
3286 isis_print_id(ndo, tlv_lsp->lsp_id, LSP_ID_LEN));
3287 ND_PRINT(", seq: 0x%08x",
3288 GET_BE_U_4(tlv_lsp->sequence_number));
3289 ND_PRINT(", lifetime: %5ds",
3290 GET_BE_U_2(tlv_lsp->remaining_lifetime));
3291 ND_PRINT(", chksum: 0x%04x", GET_BE_U_2(tlv_lsp->checksum));
3292 tlen-=sizeof(struct isis_tlv_lsp);
3293 tlv_lsp++;
3294 }
3295 break;
3296
3297 case ISIS_TLV_CHECKSUM:
3298 if (tlen < ISIS_TLV_CHECKSUM_MINLEN)
3299 break;
3300 ND_TCHECK_LEN(tptr, ISIS_TLV_CHECKSUM_MINLEN);
3301 ND_PRINT("\n\t checksum: 0x%04x ", GET_BE_U_2(tptr));
3302 /* do not attempt to verify the checksum if it is zero
3303 * most likely a HMAC-MD5 TLV is also present and
3304 * to avoid conflicts the checksum TLV is zeroed.
3305 * see rfc3358 for details
3306 */
3307 osi_print_cksum(ndo, optr, GET_BE_U_2(tptr), (int)(tptr-optr),
3308 length);
3309 break;
3310
3311 case ISIS_TLV_POI:
3312 if (tlen < 1)
3313 goto tlv_trunc;
3314 num_system_ids = GET_U_1(tptr);
3315 tptr++;
3316 tlen--;
3317 if (num_system_ids == 0) {
3318 /* Not valid */
3319 ND_PRINT(" No system IDs supplied");
3320 } else {
3321 if (tlen < SYSTEM_ID_LEN)
3322 goto tlv_trunc;
3323 ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN);
3324 ND_PRINT("\n\t Purge Originator System-ID: %s",
3325 isis_print_id(ndo, tptr, SYSTEM_ID_LEN));
3326 tptr += SYSTEM_ID_LEN;
3327 tlen -= SYSTEM_ID_LEN;
3328
3329 if (num_system_ids > 1) {
3330 if (tlen < SYSTEM_ID_LEN)
3331 goto tlv_trunc;
3332 ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN);
3333 ND_TCHECK_LEN(tptr, 2 * SYSTEM_ID_LEN + 1);
3334 ND_PRINT("\n\t Received from System-ID: %s",
3335 isis_print_id(ndo, tptr, SYSTEM_ID_LEN));
3336 }
3337 }
3338 break;
3339
3340 case ISIS_TLV_MT_SUPPORTED:
3341 while (tlen != 0) {
3342 /* length can only be a multiple of 2, otherwise there is
3343 something broken -> so decode down until length is 1 */
3344 if (tlen!=1) {
3345 mt_len = isis_print_mtid(ndo, tptr, "\n\t ", tlen);
3346 if (mt_len == 0) /* did something go wrong ? */
3347 goto trunc;
3348 tptr+=mt_len;
3349 tlen-=mt_len;
3350 } else {
3351 ND_PRINT("\n\t invalid MT-ID");
3352 break;
3353 }
3354 }
3355 break;
3356
3357 case ISIS_TLV_RESTART_SIGNALING:
3358 /* first attempt to decode the flags */
3359 if (tlen < ISIS_TLV_RESTART_SIGNALING_FLAGLEN)
3360 break;
3361 ND_TCHECK_LEN(tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN);
3362 ND_PRINT("\n\t Flags [%s]",
3363 bittok2str(isis_restart_flag_values, "none", GET_U_1(tptr)));
3364 tptr+=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
3365 tlen-=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
3366
3367 /* is there anything other than the flags field? */
3368 if (tlen == 0)
3369 break;
3370
3371 if (tlen < ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN)
3372 break;
3373 ND_TCHECK_LEN(tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN);
3374
3375 ND_PRINT(", Remaining holding time %us", GET_BE_U_2(tptr));
3376 tptr+=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
3377 tlen-=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
3378
3379 /* is there an additional sysid field present ?*/
3380 if (tlen == SYSTEM_ID_LEN) {
3381 ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN);
3382 ND_PRINT(", for %s", isis_print_id(ndo, tptr,SYSTEM_ID_LEN));
3383 }
3384 break;
3385
3386 case ISIS_TLV_IDRP_INFO:
3387 if (tlen < 1)
3388 break;
3389 isis_subtlv_idrp = GET_U_1(tptr);
3390 ND_PRINT("\n\t Inter-Domain Information Type: %s",
3391 tok2str(isis_subtlv_idrp_values,
3392 "Unknown (0x%02x)",
3393 isis_subtlv_idrp));
3394 tptr++;
3395 tlen--;
3396 switch (isis_subtlv_idrp) {
3397 case ISIS_SUBTLV_IDRP_ASN:
3398 if (tlen < 2)
3399 goto tlv_trunc;
3400 ND_PRINT("AS Number: %u", GET_BE_U_2(tptr));
3401 break;
3402 case ISIS_SUBTLV_IDRP_LOCAL:
3403 case ISIS_SUBTLV_IDRP_RES:
3404 default:
3405 if (!print_unknown_data(ndo, tptr, "\n\t ", tlen))
3406 return(0);
3407 break;
3408 }
3409 break;
3410
3411 case ISIS_TLV_LSP_BUFFERSIZE:
3412 if (tlen < 2)
3413 break;
3414 ND_PRINT("\n\t LSP Buffersize: %u", GET_BE_U_2(tptr));
3415 break;
3416
3417 case ISIS_TLV_PART_DIS:
3418 while (tlen != 0) {
3419 if (tlen < SYSTEM_ID_LEN)
3420 goto tlv_trunc;
3421 ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN);
3422 ND_PRINT("\n\t %s", isis_print_id(ndo, tptr, SYSTEM_ID_LEN));
3423 tptr+=SYSTEM_ID_LEN;
3424 tlen-=SYSTEM_ID_LEN;
3425 }
3426 break;
3427
3428 case ISIS_TLV_PREFIX_NEIGH:
3429 if (tlen < sizeof(struct isis_metric_block))
3430 break;
3431 ND_TCHECK_LEN(tptr, sizeof(struct isis_metric_block));
3432 ND_PRINT("\n\t Metric Block");
3433 isis_print_metric_block(ndo, (const struct isis_metric_block *)tptr);
3434 tptr+=sizeof(struct isis_metric_block);
3435 tlen-=sizeof(struct isis_metric_block);
3436
3437 while (tlen != 0) {
3438 prefix_len=GET_U_1(tptr); /* read out prefix length in semioctets*/
3439 tptr++;
3440 tlen--;
3441 if (prefix_len < 2) {
3442 ND_PRINT("\n\t\tAddress: prefix length %u < 2", prefix_len);
3443 break;
3444 }
3445 if (tlen < prefix_len/2)
3446 break;
3447 ND_PRINT("\n\t\tAddress: %s/%u",
3448 GET_ISONSAP_STRING(tptr, prefix_len / 2), prefix_len * 4);
3449 tptr+=prefix_len/2;
3450 tlen-=prefix_len/2;
3451 }
3452 break;
3453
3454 case ISIS_TLV_IIH_SEQNR:
3455 if (tlen < 4)
3456 break;
3457 ND_PRINT("\n\t Sequence number: %u", GET_BE_U_4(tptr));
3458 break;
3459
3460 case ISIS_TLV_ROUTER_CAPABILITY:
3461 if (tlen < 5) {
3462 ND_PRINT(" [object length %u < 5]", tlen);
3463 nd_print_invalid(ndo);
3464 break;
3465 }
3466 ND_PRINT("\n\t Router-ID %s", GET_IPADDR_STRING(tptr));
3467 ND_PRINT(", Flags [%s]",
3468 bittok2str(isis_tlv_router_capability_flags, "none", GET_U_1(tptr+4)));
3469
3470 /* Optional set of sub-TLV */
3471 if (tlen > 5) {
3472 isis_print_router_cap_subtlv(ndo, tptr+5, tlen-5);
3473 }
3474 break;
3475
3476 case ISIS_TLV_VENDOR_PRIVATE:
3477 if (tlen < 3)
3478 break;
3479 vendor_id = GET_BE_U_3(tptr);
3480 ND_PRINT("\n\t Vendor: %s (%u)",
3481 tok2str(oui_values, "Unknown", vendor_id),
3482 vendor_id);
3483 tptr+=3;
3484 tlen-=3;
3485 if (tlen != 0) /* hexdump the rest */
3486 if (!print_unknown_data(ndo, tptr, "\n\t\t", tlen))
3487 return(0);
3488 break;
3489 /*
3490 * FIXME those are the defined TLVs that lack a decoder
3491 * you are welcome to contribute code ;-)
3492 */
3493
3494 case ISIS_TLV_DECNET_PHASE4:
3495 case ISIS_TLV_LUCENT_PRIVATE:
3496 case ISIS_TLV_IPAUTH:
3497 case ISIS_TLV_NORTEL_PRIVATE1:
3498 case ISIS_TLV_NORTEL_PRIVATE2:
3499
3500 default:
3501 if (ndo->ndo_vflag <= 1) {
3502 if (!print_unknown_data(ndo, pptr, "\n\t\t", tlv_len))
3503 return(0);
3504 }
3505 break;
3506 }
3507 tlv_trunc:
3508 /* do we want to see an additionally hexdump ? */
3509 if (ndo->ndo_vflag> 1) {
3510 if (!print_unknown_data(ndo, pptr, "\n\t ", tlv_len))
3511 return(0);
3512 }
3513
3514 pptr += tlv_len;
3515 packet_len -= tlv_len;
3516 }
3517
3518 if (packet_len != 0) {
3519 ND_PRINT("\n\t %u straggler bytes", packet_len);
3520 }
3521 return (1);
3522
3523 trunc:
3524 nd_print_trunc(ndo);
3525 return (1);
3526 }
3527
3528 static void
3529 osi_print_cksum(netdissect_options *ndo, const uint8_t *pptr,
3530 uint16_t checksum, int checksum_offset, u_int length)
3531 {
3532 uint16_t calculated_checksum;
3533
3534 /* do not attempt to verify the checksum if it is zero,
3535 * if the offset is nonsense,
3536 * or the base pointer is not sane
3537 */
3538 if (!checksum
3539 || checksum_offset < 0
3540 || !ND_TTEST_2(pptr + checksum_offset)
3541 || (u_int)checksum_offset > length
3542 || !ND_TTEST_LEN(pptr, length)) {
3543 ND_PRINT(" (unverified)");
3544 } else {
3545 #if 0
3546 ND_PRINT("\nosi_print_cksum: %p %d %u\n", pptr, checksum_offset, length);
3547 #endif
3548 calculated_checksum = create_osi_cksum(pptr, checksum_offset, length);
3549 if (checksum == calculated_checksum) {
3550 ND_PRINT(" (correct)");
3551 } else {
3552 ND_PRINT(" (incorrect should be 0x%04x)", calculated_checksum);
3553 }
3554 }
3555 }
[mirror] the TCPdump network dissector