1 /*
2 * Copyright (c) 1992, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Original code by Matt Thomas, Digital Equipment Corporation
22 *
23 * Extensively modified by Hannes Gredler (hannes@gredler.at) for more
24 * complete IS-IS & CLNP support.
25 */
26
27 /* \summary: ISO CLNS, ESIS, and ISIS printer */
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
32
33 #include <netdissect-stdinc.h>
34
35 #include <string.h>
36
37 #include "netdissect.h"
38 #include "addrtoname.h"
39 #include "ether.h"
40 #include "nlpid.h"
41 #include "extract.h"
42 #include "gmpls.h"
43 #include "oui.h"
44 #include "signature.h"
45
46 static const char tstr[] = " [|isis]";
47
48 /*
49 * IS-IS is defined in ISO 10589. Look there for protocol definitions.
50 */
51
52 #define SYSTEM_ID_LEN ETHER_ADDR_LEN
53 #define NODE_ID_LEN SYSTEM_ID_LEN+1
54 #define LSP_ID_LEN SYSTEM_ID_LEN+2
55
56 #define ISIS_VERSION 1
57 #define ESIS_VERSION 1
58 #define CLNP_VERSION 1
59
60 #define ISIS_PDU_TYPE_MASK 0x1F
61 #define ESIS_PDU_TYPE_MASK 0x1F
62 #define CLNP_PDU_TYPE_MASK 0x1F
63 #define CLNP_FLAG_MASK 0xE0
64 #define ISIS_LAN_PRIORITY_MASK 0x7F
65
66 #define ISIS_PDU_L1_LAN_IIH 15
67 #define ISIS_PDU_L2_LAN_IIH 16
68 #define ISIS_PDU_PTP_IIH 17
69 #define ISIS_PDU_L1_LSP 18
70 #define ISIS_PDU_L2_LSP 20
71 #define ISIS_PDU_L1_CSNP 24
72 #define ISIS_PDU_L2_CSNP 25
73 #define ISIS_PDU_L1_PSNP 26
74 #define ISIS_PDU_L2_PSNP 27
75
76 static const struct tok isis_pdu_values[] = {
77 { ISIS_PDU_L1_LAN_IIH, "L1 Lan IIH"},
78 { ISIS_PDU_L2_LAN_IIH, "L2 Lan IIH"},
79 { ISIS_PDU_PTP_IIH, "p2p IIH"},
80 { ISIS_PDU_L1_LSP, "L1 LSP"},
81 { ISIS_PDU_L2_LSP, "L2 LSP"},
82 { ISIS_PDU_L1_CSNP, "L1 CSNP"},
83 { ISIS_PDU_L2_CSNP, "L2 CSNP"},
84 { ISIS_PDU_L1_PSNP, "L1 PSNP"},
85 { ISIS_PDU_L2_PSNP, "L2 PSNP"},
86 { 0, NULL}
87 };
88
89 /*
90 * A TLV is a tuple of a type, length and a value and is normally used for
91 * encoding information in all sorts of places. This is an enumeration of
92 * the well known types.
93 *
94 * list taken from rfc3359 plus some memory from veterans ;-)
95 */
96
97 #define ISIS_TLV_AREA_ADDR 1 /* iso10589 */
98 #define ISIS_TLV_IS_REACH 2 /* iso10589 */
99 #define ISIS_TLV_ESNEIGH 3 /* iso10589 */
100 #define ISIS_TLV_PART_DIS 4 /* iso10589 */
101 #define ISIS_TLV_PREFIX_NEIGH 5 /* iso10589 */
102 #define ISIS_TLV_ISNEIGH 6 /* iso10589 */
103 #define ISIS_TLV_ISNEIGH_VARLEN 7 /* iso10589 */
104 #define ISIS_TLV_PADDING 8 /* iso10589 */
105 #define ISIS_TLV_LSP 9 /* iso10589 */
106 #define ISIS_TLV_AUTH 10 /* iso10589, rfc3567 */
107 #define ISIS_TLV_CHECKSUM 12 /* rfc3358 */
108 #define ISIS_TLV_CHECKSUM_MINLEN 2
109 #define ISIS_TLV_POI 13 /* rfc6232 */
110 #define ISIS_TLV_LSP_BUFFERSIZE 14 /* iso10589 rev2 */
111 #define ISIS_TLV_LSP_BUFFERSIZE_MINLEN 2
112 #define ISIS_TLV_EXT_IS_REACH 22 /* draft-ietf-isis-traffic-05 */
113 #define ISIS_TLV_IS_ALIAS_ID 24 /* draft-ietf-isis-ext-lsp-frags-02 */
114 #define ISIS_TLV_DECNET_PHASE4 42
115 #define ISIS_TLV_LUCENT_PRIVATE 66
116 #define ISIS_TLV_INT_IP_REACH 128 /* rfc1195, rfc2966 */
117 #define ISIS_TLV_PROTOCOLS 129 /* rfc1195 */
118 #define ISIS_TLV_EXT_IP_REACH 130 /* rfc1195, rfc2966 */
119 #define ISIS_TLV_IDRP_INFO 131 /* rfc1195 */
120 #define ISIS_TLV_IDRP_INFO_MINLEN 1
121 #define ISIS_TLV_IPADDR 132 /* rfc1195 */
122 #define ISIS_TLV_IPAUTH 133 /* rfc1195 */
123 #define ISIS_TLV_TE_ROUTER_ID 134 /* draft-ietf-isis-traffic-05 */
124 #define ISIS_TLV_EXTD_IP_REACH 135 /* draft-ietf-isis-traffic-05 */
125 #define ISIS_TLV_HOSTNAME 137 /* rfc2763 */
126 #define ISIS_TLV_SHARED_RISK_GROUP 138 /* draft-ietf-isis-gmpls-extensions */
127 #define ISIS_TLV_MT_PORT_CAP 143 /* rfc6165 */
128 #define ISIS_TLV_MT_CAPABILITY 144 /* rfc6329 */
129 #define ISIS_TLV_NORTEL_PRIVATE1 176
130 #define ISIS_TLV_NORTEL_PRIVATE2 177
131 #define ISIS_TLV_RESTART_SIGNALING 211 /* rfc3847 */
132 #define ISIS_TLV_RESTART_SIGNALING_FLAGLEN 1
133 #define ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN 2
134 #define ISIS_TLV_MT_IS_REACH 222 /* draft-ietf-isis-wg-multi-topology-05 */
135 #define ISIS_TLV_MT_SUPPORTED 229 /* draft-ietf-isis-wg-multi-topology-05 */
136 #define ISIS_TLV_MT_SUPPORTED_MINLEN 2
137 #define ISIS_TLV_IP6ADDR 232 /* draft-ietf-isis-ipv6-02 */
138 #define ISIS_TLV_MT_IP_REACH 235 /* draft-ietf-isis-wg-multi-topology-05 */
139 #define ISIS_TLV_IP6_REACH 236 /* draft-ietf-isis-ipv6-02 */
140 #define ISIS_TLV_MT_IP6_REACH 237 /* draft-ietf-isis-wg-multi-topology-05 */
141 #define ISIS_TLV_PTP_ADJ 240 /* rfc3373 */
142 #define ISIS_TLV_IIH_SEQNR 241 /* draft-shen-isis-iih-sequence-00 */
143 #define ISIS_TLV_IIH_SEQNR_MINLEN 4
144 #define ISIS_TLV_VENDOR_PRIVATE 250 /* draft-ietf-isis-experimental-tlv-01 */
145 #define ISIS_TLV_VENDOR_PRIVATE_MINLEN 3
146
147 static const struct tok isis_tlv_values[] = {
148 { ISIS_TLV_AREA_ADDR, "Area address(es)"},
149 { ISIS_TLV_IS_REACH, "IS Reachability"},
150 { ISIS_TLV_ESNEIGH, "ES Neighbor(s)"},
151 { ISIS_TLV_PART_DIS, "Partition DIS"},
152 { ISIS_TLV_PREFIX_NEIGH, "Prefix Neighbors"},
153 { ISIS_TLV_ISNEIGH, "IS Neighbor(s)"},
154 { ISIS_TLV_ISNEIGH_VARLEN, "IS Neighbor(s) (variable length)"},
155 { ISIS_TLV_PADDING, "Padding"},
156 { ISIS_TLV_LSP, "LSP entries"},
157 { ISIS_TLV_AUTH, "Authentication"},
158 { ISIS_TLV_CHECKSUM, "Checksum"},
159 { ISIS_TLV_POI, "Purge Originator Identifier"},
160 { ISIS_TLV_LSP_BUFFERSIZE, "LSP Buffersize"},
161 { ISIS_TLV_EXT_IS_REACH, "Extended IS Reachability"},
162 { ISIS_TLV_IS_ALIAS_ID, "IS Alias ID"},
163 { ISIS_TLV_DECNET_PHASE4, "DECnet Phase IV"},
164 { ISIS_TLV_LUCENT_PRIVATE, "Lucent Proprietary"},
165 { ISIS_TLV_INT_IP_REACH, "IPv4 Internal Reachability"},
166 { ISIS_TLV_PROTOCOLS, "Protocols supported"},
167 { ISIS_TLV_EXT_IP_REACH, "IPv4 External Reachability"},
168 { ISIS_TLV_IDRP_INFO, "Inter-Domain Information Type"},
169 { ISIS_TLV_IPADDR, "IPv4 Interface address(es)"},
170 { ISIS_TLV_IPAUTH, "IPv4 authentication (deprecated)"},
171 { ISIS_TLV_TE_ROUTER_ID, "Traffic Engineering Router ID"},
172 { ISIS_TLV_EXTD_IP_REACH, "Extended IPv4 Reachability"},
173 { ISIS_TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"},
174 { ISIS_TLV_MT_PORT_CAP, "Multi-Topology-Aware Port Capability"},
175 { ISIS_TLV_MT_CAPABILITY, "Multi-Topology Capability"},
176 { ISIS_TLV_NORTEL_PRIVATE1, "Nortel Proprietary"},
177 { ISIS_TLV_NORTEL_PRIVATE2, "Nortel Proprietary"},
178 { ISIS_TLV_HOSTNAME, "Hostname"},
179 { ISIS_TLV_RESTART_SIGNALING, "Restart Signaling"},
180 { ISIS_TLV_MT_IS_REACH, "Multi Topology IS Reachability"},
181 { ISIS_TLV_MT_SUPPORTED, "Multi Topology"},
182 { ISIS_TLV_IP6ADDR, "IPv6 Interface address(es)"},
183 { ISIS_TLV_MT_IP_REACH, "Multi-Topology IPv4 Reachability"},
184 { ISIS_TLV_IP6_REACH, "IPv6 reachability"},
185 { ISIS_TLV_MT_IP6_REACH, "Multi-Topology IP6 Reachability"},
186 { ISIS_TLV_PTP_ADJ, "Point-to-point Adjacency State"},
187 { ISIS_TLV_IIH_SEQNR, "Hello PDU Sequence Number"},
188 { ISIS_TLV_VENDOR_PRIVATE, "Vendor Private"},
189 { 0, NULL }
190 };
191
192 #define ESIS_OPTION_PROTOCOLS 129
193 #define ESIS_OPTION_QOS_MAINTENANCE 195 /* iso9542 */
194 #define ESIS_OPTION_SECURITY 197 /* iso9542 */
195 #define ESIS_OPTION_ES_CONF_TIME 198 /* iso9542 */
196 #define ESIS_OPTION_PRIORITY 205 /* iso9542 */
197 #define ESIS_OPTION_ADDRESS_MASK 225 /* iso9542 */
198 #define ESIS_OPTION_SNPA_MASK 226 /* iso9542 */
199
200 static const struct tok esis_option_values[] = {
201 { ESIS_OPTION_PROTOCOLS, "Protocols supported"},
202 { ESIS_OPTION_QOS_MAINTENANCE, "QoS Maintenance" },
203 { ESIS_OPTION_SECURITY, "Security" },
204 { ESIS_OPTION_ES_CONF_TIME, "ES Configuration Time" },
205 { ESIS_OPTION_PRIORITY, "Priority" },
206 { ESIS_OPTION_ADDRESS_MASK, "Addressk Mask" },
207 { ESIS_OPTION_SNPA_MASK, "SNPA Mask" },
208 { 0, NULL }
209 };
210
211 #define CLNP_OPTION_DISCARD_REASON 193
212 #define CLNP_OPTION_QOS_MAINTENANCE 195 /* iso8473 */
213 #define CLNP_OPTION_SECURITY 197 /* iso8473 */
214 #define CLNP_OPTION_SOURCE_ROUTING 200 /* iso8473 */
215 #define CLNP_OPTION_ROUTE_RECORDING 203 /* iso8473 */
216 #define CLNP_OPTION_PADDING 204 /* iso8473 */
217 #define CLNP_OPTION_PRIORITY 205 /* iso8473 */
218
219 static const struct tok clnp_option_values[] = {
220 { CLNP_OPTION_DISCARD_REASON, "Discard Reason"},
221 { CLNP_OPTION_PRIORITY, "Priority"},
222 { CLNP_OPTION_QOS_MAINTENANCE, "QoS Maintenance"},
223 { CLNP_OPTION_SECURITY, "Security"},
224 { CLNP_OPTION_SOURCE_ROUTING, "Source Routing"},
225 { CLNP_OPTION_ROUTE_RECORDING, "Route Recording"},
226 { CLNP_OPTION_PADDING, "Padding"},
227 { 0, NULL }
228 };
229
230 static const struct tok clnp_option_rfd_class_values[] = {
231 { 0x0, "General"},
232 { 0x8, "Address"},
233 { 0x9, "Source Routeing"},
234 { 0xa, "Lifetime"},
235 { 0xb, "PDU Discarded"},
236 { 0xc, "Reassembly"},
237 { 0, NULL }
238 };
239
240 static const struct tok clnp_option_rfd_general_values[] = {
241 { 0x0, "Reason not specified"},
242 { 0x1, "Protocol procedure error"},
243 { 0x2, "Incorrect checksum"},
244 { 0x3, "PDU discarded due to congestion"},
245 { 0x4, "Header syntax error (cannot be parsed)"},
246 { 0x5, "Segmentation needed but not permitted"},
247 { 0x6, "Incomplete PDU received"},
248 { 0x7, "Duplicate option"},
249 { 0, NULL }
250 };
251
252 static const struct tok clnp_option_rfd_address_values[] = {
253 { 0x0, "Destination address unreachable"},
254 { 0x1, "Destination address unknown"},
255 { 0, NULL }
256 };
257
258 static const struct tok clnp_option_rfd_source_routeing_values[] = {
259 { 0x0, "Unspecified source routeing error"},
260 { 0x1, "Syntax error in source routeing field"},
261 { 0x2, "Unknown address in source routeing field"},
262 { 0x3, "Path not acceptable"},
263 { 0, NULL }
264 };
265
266 static const struct tok clnp_option_rfd_lifetime_values[] = {
267 { 0x0, "Lifetime expired while data unit in transit"},
268 { 0x1, "Lifetime expired during reassembly"},
269 { 0, NULL }
270 };
271
272 static const struct tok clnp_option_rfd_pdu_discard_values[] = {
273 { 0x0, "Unsupported option not specified"},
274 { 0x1, "Unsupported protocol version"},
275 { 0x2, "Unsupported security option"},
276 { 0x3, "Unsupported source routeing option"},
277 { 0x4, "Unsupported recording of route option"},
278 { 0, NULL }
279 };
280
281 static const struct tok clnp_option_rfd_reassembly_values[] = {
282 { 0x0, "Reassembly interference"},
283 { 0, NULL }
284 };
285
286 /* array of 16 error-classes */
287 static const struct tok *clnp_option_rfd_error_class[] = {
288 clnp_option_rfd_general_values,
289 NULL,
290 NULL,
291 NULL,
292 NULL,
293 NULL,
294 NULL,
295 NULL,
296 clnp_option_rfd_address_values,
297 clnp_option_rfd_source_routeing_values,
298 clnp_option_rfd_lifetime_values,
299 clnp_option_rfd_pdu_discard_values,
300 clnp_option_rfd_reassembly_values,
301 NULL,
302 NULL,
303 NULL
304 };
305
306 #define CLNP_OPTION_OPTION_QOS_MASK 0x3f
307 #define CLNP_OPTION_SCOPE_MASK 0xc0
308 #define CLNP_OPTION_SCOPE_SA_SPEC 0x40
309 #define CLNP_OPTION_SCOPE_DA_SPEC 0x80
310 #define CLNP_OPTION_SCOPE_GLOBAL 0xc0
311
312 static const struct tok clnp_option_scope_values[] = {
313 { CLNP_OPTION_SCOPE_SA_SPEC, "Source Address Specific"},
314 { CLNP_OPTION_SCOPE_DA_SPEC, "Destination Address Specific"},
315 { CLNP_OPTION_SCOPE_GLOBAL, "Globally unique"},
316 { 0, NULL }
317 };
318
319 static const struct tok clnp_option_sr_rr_values[] = {
320 { 0x0, "partial"},
321 { 0x1, "complete"},
322 { 0, NULL }
323 };
324
325 static const struct tok clnp_option_sr_rr_string_values[] = {
326 { CLNP_OPTION_SOURCE_ROUTING, "source routing"},
327 { CLNP_OPTION_ROUTE_RECORDING, "recording of route in progress"},
328 { 0, NULL }
329 };
330
331 static const struct tok clnp_option_qos_global_values[] = {
332 { 0x20, "reserved"},
333 { 0x10, "sequencing vs. delay"},
334 { 0x08, "congested"},
335 { 0x04, "delay vs. cost"},
336 { 0x02, "error vs. delay"},
337 { 0x01, "error vs. cost"},
338 { 0, NULL }
339 };
340
341 #define ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* draft-ietf-isis-traffic-05 */
342 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* rfc4205 */
343 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* draft-ietf-isis-traffic-05 */
344 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* draft-ietf-isis-traffic-05 */
345 #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* draft-ietf-isis-traffic-05 */
346 #define ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* draft-ietf-isis-traffic-05 */
347 #define ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* draft-ietf-isis-traffic-05 */
348 #define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* rfc4124 */
349 #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD 12 /* draft-ietf-tewg-diff-te-proto-06 */
350 #define ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* draft-ietf-isis-traffic-05 */
351 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE 19 /* draft-ietf-isis-link-attr-01 */
352 #define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* rfc4205 */
353 #define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* rfc4205 */
354 #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS 22 /* rfc4124 */
355
356 #define ISIS_SUBTLV_SPB_METRIC 29 /* rfc6329 */
357
358 static const struct tok isis_ext_is_reach_subtlv_values[] = {
359 { ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP, "Administrative groups" },
360 { ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
361 { ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID, "Link Remote Identifier" },
362 { ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR, "IPv4 interface address" },
363 { ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR, "IPv4 neighbor address" },
364 { ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW, "Maximum link bandwidth" },
365 { ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW, "Reservable link bandwidth" },
366 { ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW, "Unreserved bandwidth" },
367 { ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC, "Traffic Engineering Metric" },
368 { ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE, "Link Attribute" },
369 { ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE, "Link Protection Type" },
370 { ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR, "Interface Switching Capability" },
371 { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD, "Bandwidth Constraints (old)" },
372 { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS, "Bandwidth Constraints" },
373 { ISIS_SUBTLV_SPB_METRIC, "SPB Metric" },
374 { 250, "Reserved for cisco specific extensions" },
375 { 251, "Reserved for cisco specific extensions" },
376 { 252, "Reserved for cisco specific extensions" },
377 { 253, "Reserved for cisco specific extensions" },
378 { 254, "Reserved for cisco specific extensions" },
379 { 255, "Reserved for future expansion" },
380 { 0, NULL }
381 };
382
383 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32 1 /* draft-ietf-isis-admin-tags-01 */
384 #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64 2 /* draft-ietf-isis-admin-tags-01 */
385 #define ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR 117 /* draft-ietf-isis-wg-multi-topology-05 */
386
387 static const struct tok isis_ext_ip_reach_subtlv_values[] = {
388 { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32, "32-Bit Administrative tag" },
389 { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64, "64-Bit Administrative tag" },
390 { ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR, "Management Prefix Color" },
391 { 0, NULL }
392 };
393
394 static const struct tok isis_subtlv_link_attribute_values[] = {
395 { 0x01, "Local Protection Available" },
396 { 0x02, "Link excluded from local protection path" },
397 { 0x04, "Local maintenance required"},
398 { 0, NULL }
399 };
400
401 #define ISIS_SUBTLV_AUTH_SIMPLE 1
402 #define ISIS_SUBTLV_AUTH_GENERIC 3 /* rfc 5310 */
403 #define ISIS_SUBTLV_AUTH_MD5 54
404 #define ISIS_SUBTLV_AUTH_MD5_LEN 16
405 #define ISIS_SUBTLV_AUTH_PRIVATE 255
406
407 static const struct tok isis_subtlv_auth_values[] = {
408 { ISIS_SUBTLV_AUTH_SIMPLE, "simple text password"},
409 { ISIS_SUBTLV_AUTH_GENERIC, "Generic Crypto key-id"},
410 { ISIS_SUBTLV_AUTH_MD5, "HMAC-MD5 password"},
411 { ISIS_SUBTLV_AUTH_PRIVATE, "Routing Domain private password"},
412 { 0, NULL }
413 };
414
415 #define ISIS_SUBTLV_IDRP_RES 0
416 #define ISIS_SUBTLV_IDRP_LOCAL 1
417 #define ISIS_SUBTLV_IDRP_ASN 2
418
419 static const struct tok isis_subtlv_idrp_values[] = {
420 { ISIS_SUBTLV_IDRP_RES, "Reserved"},
421 { ISIS_SUBTLV_IDRP_LOCAL, "Routing-Domain Specific"},
422 { ISIS_SUBTLV_IDRP_ASN, "AS Number Tag"},
423 { 0, NULL}
424 };
425
426 #define ISIS_SUBTLV_SPB_MCID 4
427 #define ISIS_SUBTLV_SPB_DIGEST 5
428 #define ISIS_SUBTLV_SPB_BVID 6
429
430 #define ISIS_SUBTLV_SPB_INSTANCE 1
431 #define ISIS_SUBTLV_SPBM_SI 3
432
433 #define ISIS_SPB_MCID_LEN 51
434 #define ISIS_SUBTLV_SPB_MCID_MIN_LEN 102
435 #define ISIS_SUBTLV_SPB_DIGEST_MIN_LEN 33
436 #define ISIS_SUBTLV_SPB_BVID_MIN_LEN 6
437 #define ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN 19
438 #define ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN 8
439
440 static const struct tok isis_mt_port_cap_subtlv_values[] = {
441 { ISIS_SUBTLV_SPB_MCID, "SPB MCID" },
442 { ISIS_SUBTLV_SPB_DIGEST, "SPB Digest" },
443 { ISIS_SUBTLV_SPB_BVID, "SPB BVID" },
444 { 0, NULL }
445 };
446
447 static const struct tok isis_mt_capability_subtlv_values[] = {
448 { ISIS_SUBTLV_SPB_INSTANCE, "SPB Instance" },
449 { ISIS_SUBTLV_SPBM_SI, "SPBM Service Identifier and Unicast Address" },
450 { 0, NULL }
451 };
452
453 struct isis_spb_mcid {
454 uint8_t format_id;
455 uint8_t name[32];
456 uint8_t revision_lvl[2];
457 uint8_t digest[16];
458 };
459
460 struct isis_subtlv_spb_mcid {
461 struct isis_spb_mcid mcid;
462 struct isis_spb_mcid aux_mcid;
463 };
464
465 struct isis_subtlv_spb_instance {
466 uint8_t cist_root_id[8];
467 uint8_t cist_external_root_path_cost[4];
468 uint8_t bridge_priority[2];
469 uint8_t spsourceid[4];
470 uint8_t no_of_trees;
471 };
472
473 #define CLNP_SEGMENT_PART 0x80
474 #define CLNP_MORE_SEGMENTS 0x40
475 #define CLNP_REQUEST_ER 0x20
476
477 static const struct tok clnp_flag_values[] = {
478 { CLNP_SEGMENT_PART, "Segmentation permitted"},
479 { CLNP_MORE_SEGMENTS, "more Segments"},
480 { CLNP_REQUEST_ER, "request Error Report"},
481 { 0, NULL}
482 };
483
484 #define ISIS_MASK_LSP_OL_BIT(x) ((x)&0x4)
485 #define ISIS_MASK_LSP_ISTYPE_BITS(x) ((x)&0x3)
486 #define ISIS_MASK_LSP_PARTITION_BIT(x) ((x)&0x80)
487 #define ISIS_MASK_LSP_ATT_BITS(x) ((x)&0x78)
488 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x) ((x)&0x40)
489 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) ((x)&0x20)
490 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x) ((x)&0x10)
491 #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) ((x)&0x8)
492
493 #define ISIS_MASK_MTID(x) ((x)&0x0fff)
494 #define ISIS_MASK_MTFLAGS(x) ((x)&0xf000)
495
496 static const struct tok isis_mt_flag_values[] = {
497 { 0x4000, "ATT bit set"},
498 { 0x8000, "Overload bit set"},
499 { 0, NULL}
500 };
501
502 #define ISIS_MASK_TLV_EXTD_IP_UPDOWN(x) ((x)&0x80)
503 #define ISIS_MASK_TLV_EXTD_IP_SUBTLV(x) ((x)&0x40)
504
505 #define ISIS_MASK_TLV_EXTD_IP6_IE(x) ((x)&0x40)
506 #define ISIS_MASK_TLV_EXTD_IP6_SUBTLV(x) ((x)&0x20)
507
508 #define ISIS_LSP_TLV_METRIC_SUPPORTED(x) ((x)&0x80)
509 #define ISIS_LSP_TLV_METRIC_IE(x) ((x)&0x40)
510 #define ISIS_LSP_TLV_METRIC_UPDOWN(x) ((x)&0x80)
511 #define ISIS_LSP_TLV_METRIC_VALUE(x) ((x)&0x3f)
512
513 #define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1)
514
515 static const struct tok isis_mt_values[] = {
516 { 0, "IPv4 unicast"},
517 { 1, "In-Band Management"},
518 { 2, "IPv6 unicast"},
519 { 3, "Multicast"},
520 { 4095, "Development, Experimental or Proprietary"},
521 { 0, NULL }
522 };
523
524 static const struct tok isis_iih_circuit_type_values[] = {
525 { 1, "Level 1 only"},
526 { 2, "Level 2 only"},
527 { 3, "Level 1, Level 2"},
528 { 0, NULL}
529 };
530
531 #define ISIS_LSP_TYPE_UNUSED0 0
532 #define ISIS_LSP_TYPE_LEVEL_1 1
533 #define ISIS_LSP_TYPE_UNUSED2 2
534 #define ISIS_LSP_TYPE_LEVEL_2 3
535
536 static const struct tok isis_lsp_istype_values[] = {
537 { ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"},
538 { ISIS_LSP_TYPE_LEVEL_1, "L1 IS"},
539 { ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"},
540 { ISIS_LSP_TYPE_LEVEL_2, "L2 IS"},
541 { 0, NULL }
542 };
543
544 /*
545 * Katz's point to point adjacency TLV uses codes to tell us the state of
546 * the remote adjacency. Enumerate them.
547 */
548
549 #define ISIS_PTP_ADJ_UP 0
550 #define ISIS_PTP_ADJ_INIT 1
551 #define ISIS_PTP_ADJ_DOWN 2
552
553 static const struct tok isis_ptp_adjancey_values[] = {
554 { ISIS_PTP_ADJ_UP, "Up" },
555 { ISIS_PTP_ADJ_INIT, "Initializing" },
556 { ISIS_PTP_ADJ_DOWN, "Down" },
557 { 0, NULL}
558 };
559
560 struct isis_tlv_ptp_adj {
561 uint8_t adjacency_state;
562 uint8_t extd_local_circuit_id[4];
563 uint8_t neighbor_sysid[SYSTEM_ID_LEN];
564 uint8_t neighbor_extd_local_circuit_id[4];
565 };
566
567 static void osi_print_cksum(netdissect_options *, const uint8_t *pptr,
568 uint16_t checksum, int checksum_offset, u_int length);
569 static int clnp_print(netdissect_options *, const uint8_t *, u_int);
570 static void esis_print(netdissect_options *, const uint8_t *, u_int);
571 static int isis_print(netdissect_options *, const uint8_t *, u_int);
572
573 struct isis_metric_block {
574 uint8_t metric_default;
575 uint8_t metric_delay;
576 uint8_t metric_expense;
577 uint8_t metric_error;
578 };
579
580 struct isis_tlv_is_reach {
581 struct isis_metric_block isis_metric_block;
582 uint8_t neighbor_nodeid[NODE_ID_LEN];
583 };
584
585 struct isis_tlv_es_reach {
586 struct isis_metric_block isis_metric_block;
587 uint8_t neighbor_sysid[SYSTEM_ID_LEN];
588 };
589
590 struct isis_tlv_ip_reach {
591 struct isis_metric_block isis_metric_block;
592 uint8_t prefix[4];
593 uint8_t mask[4];
594 };
595
596 static const struct tok isis_is_reach_virtual_values[] = {
597 { 0, "IsNotVirtual"},
598 { 1, "IsVirtual"},
599 { 0, NULL }
600 };
601
602 static const struct tok isis_restart_flag_values[] = {
603 { 0x1, "Restart Request"},
604 { 0x2, "Restart Acknowledgement"},
605 { 0x4, "Suppress adjacency advertisement"},
606 { 0, NULL }
607 };
608
609 struct isis_common_header {
610 uint8_t nlpid;
611 uint8_t fixed_len;
612 uint8_t version; /* Protocol version */
613 uint8_t id_length;
614 uint8_t pdu_type; /* 3 MSbits are reserved */
615 uint8_t pdu_version; /* Packet format version */
616 uint8_t reserved;
617 uint8_t max_area;
618 };
619
620 struct isis_iih_lan_header {
621 uint8_t circuit_type;
622 uint8_t source_id[SYSTEM_ID_LEN];
623 uint8_t holding_time[2];
624 uint8_t pdu_len[2];
625 uint8_t priority;
626 uint8_t lan_id[NODE_ID_LEN];
627 };
628
629 struct isis_iih_ptp_header {
630 uint8_t circuit_type;
631 uint8_t source_id[SYSTEM_ID_LEN];
632 uint8_t holding_time[2];
633 uint8_t pdu_len[2];
634 uint8_t circuit_id;
635 };
636
637 struct isis_lsp_header {
638 uint8_t pdu_len[2];
639 uint8_t remaining_lifetime[2];
640 uint8_t lsp_id[LSP_ID_LEN];
641 uint8_t sequence_number[4];
642 uint8_t checksum[2];
643 uint8_t typeblock;
644 };
645
646 struct isis_csnp_header {
647 uint8_t pdu_len[2];
648 uint8_t source_id[NODE_ID_LEN];
649 uint8_t start_lsp_id[LSP_ID_LEN];
650 uint8_t end_lsp_id[LSP_ID_LEN];
651 };
652
653 struct isis_psnp_header {
654 uint8_t pdu_len[2];
655 uint8_t source_id[NODE_ID_LEN];
656 };
657
658 struct isis_tlv_lsp {
659 uint8_t remaining_lifetime[2];
660 uint8_t lsp_id[LSP_ID_LEN];
661 uint8_t sequence_number[4];
662 uint8_t checksum[2];
663 };
664
665 #define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
666 #define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header))
667 #define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header))
668 #define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header))
669 #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header))
670 #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header))
671
672 void
isoclns_print(netdissect_options * ndo,const uint8_t * p,u_int length)673 isoclns_print(netdissect_options *ndo, const uint8_t *p, u_int length)
674 {
675 if (!ND_TTEST(*p)) { /* enough bytes on the wire ? */
676 ND_PRINT((ndo, "|OSI"));
677 return;
678 }
679
680 if (ndo->ndo_eflag)
681 ND_PRINT((ndo, "OSI NLPID %s (0x%02x): ", tok2str(nlpid_values, "Unknown", *p), *p));
682
683 switch (*p) {
684
685 case NLPID_CLNP:
686 if (!clnp_print(ndo, p, length))
687 print_unknown_data(ndo, p, "\n\t", length);
688 break;
689
690 case NLPID_ESIS:
691 esis_print(ndo, p, length);
692 return;
693
694 case NLPID_ISIS:
695 if (!isis_print(ndo, p, length))
696 print_unknown_data(ndo, p, "\n\t", length);
697 break;
698
699 case NLPID_NULLNS:
700 ND_PRINT((ndo, "%slength: %u", ndo->ndo_eflag ? "" : ", ", length));
701 break;
702
703 case NLPID_Q933:
704 q933_print(ndo, p + 1, length - 1);
705 break;
706
707 case NLPID_IP:
708 ip_print(ndo, p + 1, length - 1);
709 break;
710
711 case NLPID_IP6:
712 ip6_print(ndo, p + 1, length - 1);
713 break;
714
715 case NLPID_PPP:
716 ppp_print(ndo, p + 1, length - 1);
717 break;
718
719 default:
720 if (!ndo->ndo_eflag)
721 ND_PRINT((ndo, "OSI NLPID 0x%02x unknown", *p));
722 ND_PRINT((ndo, "%slength: %u", ndo->ndo_eflag ? "" : ", ", length));
723 if (length > 1)
724 print_unknown_data(ndo, p, "\n\t", length);
725 break;
726 }
727 }
728
729 #define CLNP_PDU_ER 1
730 #define CLNP_PDU_DT 28
731 #define CLNP_PDU_MD 29
732 #define CLNP_PDU_ERQ 30
733 #define CLNP_PDU_ERP 31
734
735 static const struct tok clnp_pdu_values[] = {
736 { CLNP_PDU_ER, "Error Report"},
737 { CLNP_PDU_MD, "MD"},
738 { CLNP_PDU_DT, "Data"},
739 { CLNP_PDU_ERQ, "Echo Request"},
740 { CLNP_PDU_ERP, "Echo Response"},
741 { 0, NULL }
742 };
743
744 struct clnp_header_t {
745 uint8_t nlpid;
746 uint8_t length_indicator;
747 uint8_t version;
748 uint8_t lifetime; /* units of 500ms */
749 uint8_t type;
750 uint8_t segment_length[2];
751 uint8_t cksum[2];
752 };
753
754 struct clnp_segment_header_t {
755 uint8_t data_unit_id[2];
756 uint8_t segment_offset[2];
757 uint8_t total_length[2];
758 };
759
760 /*
761 * clnp_print
762 * Decode CLNP packets. Return 0 on error.
763 */
764
765 static int
clnp_print(netdissect_options * ndo,const uint8_t * pptr,u_int length)766 clnp_print(netdissect_options *ndo,
767 const uint8_t *pptr, u_int length)
768 {
769 const uint8_t *optr,*source_address,*dest_address;
770 u_int li,tlen,nsap_offset,source_address_length,dest_address_length, clnp_pdu_type, clnp_flags;
771 const struct clnp_header_t *clnp_header;
772 const struct clnp_segment_header_t *clnp_segment_header;
773 uint8_t rfd_error_major,rfd_error_minor;
774
775 clnp_header = (const struct clnp_header_t *) pptr;
776 ND_TCHECK(*clnp_header);
777
778 li = clnp_header->length_indicator;
779 optr = pptr;
780
781 if (!ndo->ndo_eflag)
782 ND_PRINT((ndo, "CLNP"));
783
784 /*
785 * Sanity checking of the header.
786 */
787
788 if (clnp_header->version != CLNP_VERSION) {
789 ND_PRINT((ndo, "version %d packet not supported", clnp_header->version));
790 return (0);
791 }
792
793 if (li > length) {
794 ND_PRINT((ndo, " length indicator(%u) > PDU size (%u)!", li, length));
795 return (0);
796 }
797
798 if (li < sizeof(struct clnp_header_t)) {
799 ND_PRINT((ndo, " length indicator %u < min PDU size:", li));
800 while (pptr < ndo->ndo_snapend)
801 ND_PRINT((ndo, "%02X", *pptr++));
802 return (0);
803 }
804
805 /* FIXME further header sanity checking */
806
807 clnp_pdu_type = clnp_header->type & CLNP_PDU_TYPE_MASK;
808 clnp_flags = clnp_header->type & CLNP_FLAG_MASK;
809
810 pptr += sizeof(struct clnp_header_t);
811 li -= sizeof(struct clnp_header_t);
812
813 if (li < 1) {
814 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses"));
815 return (0);
816 }
817 ND_TCHECK(*pptr);
818 dest_address_length = *pptr;
819 pptr += 1;
820 li -= 1;
821 if (li < dest_address_length) {
822 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses"));
823 return (0);
824 }
825 ND_TCHECK2(*pptr, dest_address_length);
826 dest_address = pptr;
827 pptr += dest_address_length;
828 li -= dest_address_length;
829
830 if (li < 1) {
831 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses"));
832 return (0);
833 }
834 ND_TCHECK(*pptr);
835 source_address_length = *pptr;
836 pptr += 1;
837 li -= 1;
838 if (li < source_address_length) {
839 ND_PRINT((ndo, "li < size of fixed part of CLNP header and addresses"));
840 return (0);
841 }
842 ND_TCHECK2(*pptr, source_address_length);
843 source_address = pptr;
844 pptr += source_address_length;
845 li -= source_address_length;
846
847 if (ndo->ndo_vflag < 1) {
848 ND_PRINT((ndo, "%s%s > %s, %s, length %u",
849 ndo->ndo_eflag ? "" : ", ",
850 isonsap_string(ndo, source_address, source_address_length),
851 isonsap_string(ndo, dest_address, dest_address_length),
852 tok2str(clnp_pdu_values,"unknown (%u)",clnp_pdu_type),
853 length));
854 return (1);
855 }
856 ND_PRINT((ndo, "%slength %u", ndo->ndo_eflag ? "" : ", ", length));
857
858 ND_PRINT((ndo, "\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x",
859 tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type),
860 clnp_header->length_indicator,
861 clnp_header->version,
862 clnp_header->lifetime/2,
863 (clnp_header->lifetime%2)*5,
864 EXTRACT_16BITS(clnp_header->segment_length),
865 EXTRACT_16BITS(clnp_header->cksum)));
866
867 osi_print_cksum(ndo, optr, EXTRACT_16BITS(clnp_header->cksum), 7,
868 clnp_header->length_indicator);
869
870 ND_PRINT((ndo, "\n\tFlags [%s]",
871 bittok2str(clnp_flag_values, "none", clnp_flags)));
872
873 ND_PRINT((ndo, "\n\tsource address (length %u): %s\n\tdest address (length %u): %s",
874 source_address_length,
875 isonsap_string(ndo, source_address, source_address_length),
876 dest_address_length,
877 isonsap_string(ndo, dest_address, dest_address_length)));
878
879 if (clnp_flags & CLNP_SEGMENT_PART) {
880 if (li < sizeof(const struct clnp_segment_header_t)) {
881 ND_PRINT((ndo, "li < size of fixed part of CLNP header, addresses, and segment part"));
882 return (0);
883 }
884 clnp_segment_header = (const struct clnp_segment_header_t *) pptr;
885 ND_TCHECK(*clnp_segment_header);
886 ND_PRINT((ndo, "\n\tData Unit ID: 0x%04x, Segment Offset: %u, Total PDU Length: %u",
887 EXTRACT_16BITS(clnp_segment_header->data_unit_id),
888 EXTRACT_16BITS(clnp_segment_header->segment_offset),
889 EXTRACT_16BITS(clnp_segment_header->total_length)));
890 pptr+=sizeof(const struct clnp_segment_header_t);
891 li-=sizeof(const struct clnp_segment_header_t);
892 }
893
894 /* now walk the options */
895 while (li >= 2) {
896 u_int op, opli;
897 const uint8_t *tptr;
898
899 if (li < 2) {
900 ND_PRINT((ndo, ", bad opts/li"));
901 return (0);
902 }
903 ND_TCHECK2(*pptr, 2);
904 op = *pptr++;
905 opli = *pptr++;
906 li -= 2;
907 if (opli > li) {
908 ND_PRINT((ndo, ", opt (%d) too long", op));
909 return (0);
910 }
911 ND_TCHECK2(*pptr, opli);
912 li -= opli;
913 tptr = pptr;
914 tlen = opli;
915
916 ND_PRINT((ndo, "\n\t %s Option #%u, length %u, value: ",
917 tok2str(clnp_option_values,"Unknown",op),
918 op,
919 opli));
920
921 /*
922 * We've already checked that the entire option is present
923 * in the captured packet with the ND_TCHECK2() call.
924 * Therefore, we don't need to do ND_TCHECK()/ND_TCHECK2()
925 * checks.
926 * We do, however, need to check tlen, to make sure we
927 * don't run past the end of the option.
928 */
929 switch (op) {
930
931
932 case CLNP_OPTION_ROUTE_RECORDING: /* those two options share the format */
933 case CLNP_OPTION_SOURCE_ROUTING:
934 if (tlen < 2) {
935 ND_PRINT((ndo, ", bad opt len"));
936 return (0);
937 }
938 ND_PRINT((ndo, "%s %s",
939 tok2str(clnp_option_sr_rr_values,"Unknown",*tptr),
940 tok2str(clnp_option_sr_rr_string_values, "Unknown Option %u", op)));
941 nsap_offset=*(tptr+1);
942 if (nsap_offset == 0) {
943 ND_PRINT((ndo, " Bad NSAP offset (0)"));
944 break;
945 }
946 nsap_offset-=1; /* offset to nsap list */
947 if (nsap_offset > tlen) {
948 ND_PRINT((ndo, " Bad NSAP offset (past end of option)"));
949 break;
950 }
951 tptr+=nsap_offset;
952 tlen-=nsap_offset;
953 while (tlen > 0) {
954 source_address_length=*tptr;
955 if (tlen < source_address_length+1) {
956 ND_PRINT((ndo, "\n\t NSAP address goes past end of option"));
957 break;
958 }
959 if (source_address_length > 0) {
960 source_address=(tptr+1);
961 ND_TCHECK2(*source_address, source_address_length);
962 ND_PRINT((ndo, "\n\t NSAP address (length %u): %s",
963 source_address_length,
964 isonsap_string(ndo, source_address, source_address_length)));
965 }
966 tlen-=source_address_length+1;
967 }
968 break;
969
970 case CLNP_OPTION_PRIORITY:
971 if (tlen < 1) {
972 ND_PRINT((ndo, ", bad opt len"));
973 return (0);
974 }
975 ND_PRINT((ndo, "0x%1x", *tptr&0x0f));
976 break;
977
978 case CLNP_OPTION_QOS_MAINTENANCE:
979 if (tlen < 1) {
980 ND_PRINT((ndo, ", bad opt len"));
981 return (0);
982 }
983 ND_PRINT((ndo, "\n\t Format Code: %s",
984 tok2str(clnp_option_scope_values, "Reserved", *tptr&CLNP_OPTION_SCOPE_MASK)));
985
986 if ((*tptr&CLNP_OPTION_SCOPE_MASK) == CLNP_OPTION_SCOPE_GLOBAL)
987 ND_PRINT((ndo, "\n\t QoS Flags [%s]",
988 bittok2str(clnp_option_qos_global_values,
989 "none",
990 *tptr&CLNP_OPTION_OPTION_QOS_MASK)));
991 break;
992
993 case CLNP_OPTION_SECURITY:
994 if (tlen < 2) {
995 ND_PRINT((ndo, ", bad opt len"));
996 return (0);
997 }
998 ND_PRINT((ndo, "\n\t Format Code: %s, Security-Level %u",
999 tok2str(clnp_option_scope_values,"Reserved",*tptr&CLNP_OPTION_SCOPE_MASK),
1000 *(tptr+1)));
1001 break;
1002
1003 case CLNP_OPTION_DISCARD_REASON:
1004 if (tlen < 1) {
1005 ND_PRINT((ndo, ", bad opt len"));
1006 return (0);
1007 }
1008 rfd_error_major = (*tptr&0xf0) >> 4;
1009 rfd_error_minor = *tptr&0x0f;
1010 ND_PRINT((ndo, "\n\t Class: %s Error (0x%01x), %s (0x%01x)",
1011 tok2str(clnp_option_rfd_class_values,"Unknown",rfd_error_major),
1012 rfd_error_major,
1013 tok2str(clnp_option_rfd_error_class[rfd_error_major],"Unknown",rfd_error_minor),
1014 rfd_error_minor));
1015 break;
1016
1017 case CLNP_OPTION_PADDING:
1018 ND_PRINT((ndo, "padding data"));
1019 break;
1020
1021 /*
1022 * FIXME those are the defined Options that lack a decoder
1023 * you are welcome to contribute code ;-)
1024 */
1025
1026 default:
1027 print_unknown_data(ndo, tptr, "\n\t ", opli);
1028 break;
1029 }
1030 if (ndo->ndo_vflag > 1)
1031 print_unknown_data(ndo, pptr, "\n\t ", opli);
1032 pptr += opli;
1033 }
1034
1035 switch (clnp_pdu_type) {
1036
1037 case CLNP_PDU_ER: /* fall through */
1038 case CLNP_PDU_ERP:
1039 ND_TCHECK(*pptr);
1040 if (*(pptr) == NLPID_CLNP) {
1041 ND_PRINT((ndo, "\n\t-----original packet-----\n\t"));
1042 /* FIXME recursion protection */
1043 clnp_print(ndo, pptr, length - clnp_header->length_indicator);
1044 break;
1045 }
1046
1047 case CLNP_PDU_DT:
1048 case CLNP_PDU_MD:
1049 case CLNP_PDU_ERQ:
1050
1051 default:
1052 /* dump the PDU specific data */
1053 if (length-(pptr-optr) > 0) {
1054 ND_PRINT((ndo, "\n\t undecoded non-header data, length %u", length-clnp_header->length_indicator));
1055 print_unknown_data(ndo, pptr, "\n\t ", length - (pptr - optr));
1056 }
1057 }
1058
1059 return (1);
1060
1061 trunc:
1062 ND_PRINT((ndo, "[|clnp]"));
1063 return (1);
1064
1065 }
1066
1067
1068 #define ESIS_PDU_REDIRECT 6
1069 #define ESIS_PDU_ESH 2
1070 #define ESIS_PDU_ISH 4
1071
1072 static const struct tok esis_pdu_values[] = {
1073 { ESIS_PDU_REDIRECT, "redirect"},
1074 { ESIS_PDU_ESH, "ESH"},
1075 { ESIS_PDU_ISH, "ISH"},
1076 { 0, NULL }
1077 };
1078
1079 struct esis_header_t {
1080 uint8_t nlpid;
1081 uint8_t length_indicator;
1082 uint8_t version;
1083 uint8_t reserved;
1084 uint8_t type;
1085 uint8_t holdtime[2];
1086 uint8_t cksum[2];
1087 };
1088
1089 static void
esis_print(netdissect_options * ndo,const uint8_t * pptr,u_int length)1090 esis_print(netdissect_options *ndo,
1091 const uint8_t *pptr, u_int length)
1092 {
1093 const uint8_t *optr;
1094 u_int li,esis_pdu_type,source_address_length, source_address_number;
1095 const struct esis_header_t *esis_header;
1096
1097 if (!ndo->ndo_eflag)
1098 ND_PRINT((ndo, "ES-IS"));
1099
1100 if (length <= 2) {
1101 ND_PRINT((ndo, ndo->ndo_qflag ? "bad pkt!" : "no header at all!"));
1102 return;
1103 }
1104
1105 esis_header = (const struct esis_header_t *) pptr;
1106 ND_TCHECK(*esis_header);
1107 li = esis_header->length_indicator;
1108 optr = pptr;
1109
1110 /*
1111 * Sanity checking of the header.
1112 */
1113
1114 if (esis_header->nlpid != NLPID_ESIS) {
1115 ND_PRINT((ndo, " nlpid 0x%02x packet not supported", esis_header->nlpid));
1116 return;
1117 }
1118
1119 if (esis_header->version != ESIS_VERSION) {
1120 ND_PRINT((ndo, " version %d packet not supported", esis_header->version));
1121 return;
1122 }
1123
1124 if (li > length) {
1125 ND_PRINT((ndo, " length indicator(%u) > PDU size (%u)!", li, length));
1126 return;
1127 }
1128
1129 if (li < sizeof(struct esis_header_t) + 2) {
1130 ND_PRINT((ndo, " length indicator %u < min PDU size:", li));
1131 while (pptr < ndo->ndo_snapend)
1132 ND_PRINT((ndo, "%02X", *pptr++));
1133 return;
1134 }
1135
1136 esis_pdu_type = esis_header->type & ESIS_PDU_TYPE_MASK;
1137
1138 if (ndo->ndo_vflag < 1) {
1139 ND_PRINT((ndo, "%s%s, length %u",
1140 ndo->ndo_eflag ? "" : ", ",
1141 tok2str(esis_pdu_values,"unknown type (%u)",esis_pdu_type),
1142 length));
1143 return;
1144 } else
1145 ND_PRINT((ndo, "%slength %u\n\t%s (%u)",
1146 ndo->ndo_eflag ? "" : ", ",
1147 length,
1148 tok2str(esis_pdu_values,"unknown type: %u", esis_pdu_type),
1149 esis_pdu_type));
1150
1151 ND_PRINT((ndo, ", v: %u%s", esis_header->version, esis_header->version == ESIS_VERSION ? "" : "unsupported" ));
1152 ND_PRINT((ndo, ", checksum: 0x%04x", EXTRACT_16BITS(esis_header->cksum)));
1153
1154 osi_print_cksum(ndo, pptr, EXTRACT_16BITS(esis_header->cksum), 7, li);
1155
1156 ND_PRINT((ndo, ", holding time: %us, length indicator: %u",
1157 EXTRACT_16BITS(esis_header->holdtime), li));
1158
1159 if (ndo->ndo_vflag > 1)
1160 print_unknown_data(ndo, optr, "\n\t", sizeof(struct esis_header_t));
1161
1162 pptr += sizeof(struct esis_header_t);
1163 li -= sizeof(struct esis_header_t);
1164
1165 switch (esis_pdu_type) {
1166 case ESIS_PDU_REDIRECT: {
1167 const uint8_t *dst, *snpa, *neta;
1168 u_int dstl, snpal, netal;
1169
1170 ND_TCHECK(*pptr);
1171 if (li < 1) {
1172 ND_PRINT((ndo, ", bad redirect/li"));
1173 return;
1174 }
1175 dstl = *pptr;
1176 pptr++;
1177 li--;
1178 ND_TCHECK2(*pptr, dstl);
1179 if (li < dstl) {
1180 ND_PRINT((ndo, ", bad redirect/li"));
1181 return;
1182 }
1183 dst = pptr;
1184 pptr += dstl;
1185 li -= dstl;
1186 ND_PRINT((ndo, "\n\t %s", isonsap_string(ndo, dst, dstl)));
1187
1188 ND_TCHECK(*pptr);
1189 if (li < 1) {
1190 ND_PRINT((ndo, ", bad redirect/li"));
1191 return;
1192 }
1193 snpal = *pptr;
1194 pptr++;
1195 li--;
1196 ND_TCHECK2(*pptr, snpal);
1197 if (li < snpal) {
1198 ND_PRINT((ndo, ", bad redirect/li"));
1199 return;
1200 }
1201 snpa = pptr;
1202 pptr += snpal;
1203 li -= snpal;
1204 ND_TCHECK(*pptr);
1205 if (li < 1) {
1206 ND_PRINT((ndo, ", bad redirect/li"));
1207 return;
1208 }
1209 netal = *pptr;
1210 pptr++;
1211 ND_TCHECK2(*pptr, netal);
1212 if (li < netal) {
1213 ND_PRINT((ndo, ", bad redirect/li"));
1214 return;
1215 }
1216 neta = pptr;
1217 pptr += netal;
1218 li -= netal;
1219
1220 if (snpal == 6)
1221 ND_PRINT((ndo, "\n\t SNPA (length: %u): %s",
1222 snpal,
1223 etheraddr_string(ndo, snpa)));
1224 else
1225 ND_PRINT((ndo, "\n\t SNPA (length: %u): %s",
1226 snpal,
1227 linkaddr_string(ndo, snpa, LINKADDR_OTHER, snpal)));
1228 if (netal != 0)
1229 ND_PRINT((ndo, "\n\t NET (length: %u) %s",
1230 netal,
1231 isonsap_string(ndo, neta, netal)));
1232 break;
1233 }
1234
1235 case ESIS_PDU_ESH:
1236 ND_TCHECK(*pptr);
1237 if (li < 1) {
1238 ND_PRINT((ndo, ", bad esh/li"));
1239 return;
1240 }
1241 source_address_number = *pptr;
1242 pptr++;
1243 li--;
1244
1245 ND_PRINT((ndo, "\n\t Number of Source Addresses: %u", source_address_number));
1246
1247 while (source_address_number > 0) {
1248 ND_TCHECK(*pptr);
1249 if (li < 1) {
1250 ND_PRINT((ndo, ", bad esh/li"));
1251 return;
1252 }
1253 source_address_length = *pptr;
1254 pptr++;
1255 li--;
1256
1257 ND_TCHECK2(*pptr, source_address_length);
1258 if (li < source_address_length) {
1259 ND_PRINT((ndo, ", bad esh/li"));
1260 return;
1261 }
1262 ND_PRINT((ndo, "\n\t NET (length: %u): %s",
1263 source_address_length,
1264 isonsap_string(ndo, pptr, source_address_length)));
1265 pptr += source_address_length;
1266 li -= source_address_length;
1267 source_address_number--;
1268 }
1269
1270 break;
1271
1272 case ESIS_PDU_ISH: {
1273 ND_TCHECK(*pptr);
1274 if (li < 1) {
1275 ND_PRINT((ndo, ", bad ish/li"));
1276 return;
1277 }
1278 source_address_length = *pptr;
1279 pptr++;
1280 li--;
1281 ND_TCHECK2(*pptr, source_address_length);
1282 if (li < source_address_length) {
1283 ND_PRINT((ndo, ", bad ish/li"));
1284 return;
1285 }
1286 ND_PRINT((ndo, "\n\t NET (length: %u): %s", source_address_length, isonsap_string(ndo, pptr, source_address_length)));
1287 pptr += source_address_length;
1288 li -= source_address_length;
1289 break;
1290 }
1291
1292 default:
1293 if (ndo->ndo_vflag <= 1) {
1294 if (pptr < ndo->ndo_snapend)
1295 print_unknown_data(ndo, pptr, "\n\t ", ndo->ndo_snapend - pptr);
1296 }
1297 return;
1298 }
1299
1300 /* now walk the options */
1301 while (li != 0) {
1302 u_int op, opli;
1303 const uint8_t *tptr;
1304
1305 if (li < 2) {
1306 ND_PRINT((ndo, ", bad opts/li"));
1307 return;
1308 }
1309 ND_TCHECK2(*pptr, 2);
1310 op = *pptr++;
1311 opli = *pptr++;
1312 li -= 2;
1313 if (opli > li) {
1314 ND_PRINT((ndo, ", opt (%d) too long", op));
1315 return;
1316 }
1317 li -= opli;
1318 tptr = pptr;
1319
1320 ND_PRINT((ndo, "\n\t %s Option #%u, length %u, value: ",
1321 tok2str(esis_option_values,"Unknown",op),
1322 op,
1323 opli));
1324
1325 switch (op) {
1326
1327 case ESIS_OPTION_ES_CONF_TIME:
1328 if (opli == 2) {
1329 ND_TCHECK2(*pptr, 2);
1330 ND_PRINT((ndo, "%us", EXTRACT_16BITS(tptr)));
1331 } else
1332 ND_PRINT((ndo, "(bad length)"));
1333 break;
1334
1335 case ESIS_OPTION_PROTOCOLS:
1336 while (opli>0) {
1337 ND_TCHECK(*tptr);
1338 ND_PRINT((ndo, "%s (0x%02x)",
1339 tok2str(nlpid_values,
1340 "unknown",
1341 *tptr),
1342 *tptr));
1343 if (opli>1) /* further NPLIDs ? - put comma */
1344 ND_PRINT((ndo, ", "));
1345 tptr++;
1346 opli--;
1347 }
1348 break;
1349
1350 /*
1351 * FIXME those are the defined Options that lack a decoder
1352 * you are welcome to contribute code ;-)
1353 */
1354
1355 case ESIS_OPTION_QOS_MAINTENANCE:
1356 case ESIS_OPTION_SECURITY:
1357 case ESIS_OPTION_PRIORITY:
1358 case ESIS_OPTION_ADDRESS_MASK:
1359 case ESIS_OPTION_SNPA_MASK:
1360
1361 default:
1362 print_unknown_data(ndo, tptr, "\n\t ", opli);
1363 break;
1364 }
1365 if (ndo->ndo_vflag > 1)
1366 print_unknown_data(ndo, pptr, "\n\t ", opli);
1367 pptr += opli;
1368 }
1369 trunc:
1370 ND_PRINT((ndo, "[|esis]"));
1371 }
1372
1373 static void
isis_print_mcid(netdissect_options * ndo,const struct isis_spb_mcid * mcid)1374 isis_print_mcid(netdissect_options *ndo,
1375 const struct isis_spb_mcid *mcid)
1376 {
1377 int i;
1378
1379 ND_TCHECK(*mcid);
1380 ND_PRINT((ndo, "ID: %d, Name: ", mcid->format_id));
1381
1382 if (fn_printzp(ndo, mcid->name, 32, ndo->ndo_snapend))
1383 goto trunc;
1384
1385 ND_PRINT((ndo, "\n\t Lvl: %d", EXTRACT_16BITS(mcid->revision_lvl)));
1386
1387 ND_PRINT((ndo, ", Digest: "));
1388
1389 for(i=0;i<16;i++)
1390 ND_PRINT((ndo, "%.2x ", mcid->digest[i]));
1391
1392 trunc:
1393 ND_PRINT((ndo, "%s", tstr));
1394 }
1395
1396 static int
isis_print_mt_port_cap_subtlv(netdissect_options * ndo,const uint8_t * tptr,int len)1397 isis_print_mt_port_cap_subtlv(netdissect_options *ndo,
1398 const uint8_t *tptr, int len)
1399 {
1400 int stlv_type, stlv_len;
1401 const struct isis_subtlv_spb_mcid *subtlv_spb_mcid;
1402 int i;
1403
1404 while (len > 2)
1405 {
1406 ND_TCHECK2(*tptr, 2);
1407 stlv_type = *(tptr++);
1408 stlv_len = *(tptr++);
1409
1410 /* first lets see if we know the subTLVs name*/
1411 ND_PRINT((ndo, "\n\t %s subTLV #%u, length: %u",
1412 tok2str(isis_mt_port_cap_subtlv_values, "unknown", stlv_type),
1413 stlv_type,
1414 stlv_len));
1415
1416 /*len -= TLV_TYPE_LEN_OFFSET;*/
1417 len = len -2;
1418
1419 /* Make sure the subTLV fits within the space left */
1420 if (len < stlv_len)
1421 goto trunc;
1422 /* Make sure the entire subTLV is in the captured data */
1423 ND_TCHECK2(*(tptr), stlv_len);
1424
1425 switch (stlv_type)
1426 {
1427 case ISIS_SUBTLV_SPB_MCID:
1428 {
1429 if (stlv_len < ISIS_SUBTLV_SPB_MCID_MIN_LEN)
1430 goto trunc;
1431
1432 subtlv_spb_mcid = (const struct isis_subtlv_spb_mcid *)tptr;
1433
1434 ND_PRINT((ndo, "\n\t MCID: "));
1435 isis_print_mcid(ndo, &(subtlv_spb_mcid->mcid));
1436
1437 /*tptr += SPB_MCID_MIN_LEN;
1438 len -= SPB_MCID_MIN_LEN; */
1439
1440 ND_PRINT((ndo, "\n\t AUX-MCID: "));
1441 isis_print_mcid(ndo, &(subtlv_spb_mcid->aux_mcid));
1442
1443 /*tptr += SPB_MCID_MIN_LEN;
1444 len -= SPB_MCID_MIN_LEN; */
1445 tptr = tptr + ISIS_SUBTLV_SPB_MCID_MIN_LEN;
1446 len = len - ISIS_SUBTLV_SPB_MCID_MIN_LEN;
1447 stlv_len = stlv_len - ISIS_SUBTLV_SPB_MCID_MIN_LEN;
1448
1449 break;
1450 }
1451
1452 case ISIS_SUBTLV_SPB_DIGEST:
1453 {
1454 if (stlv_len < ISIS_SUBTLV_SPB_DIGEST_MIN_LEN)
1455 goto trunc;
1456
1457 ND_PRINT((ndo, "\n\t RES: %d V: %d A: %d D: %d",
1458 (*(tptr) >> 5), (((*tptr)>> 4) & 0x01),
1459 ((*(tptr) >> 2) & 0x03), ((*tptr) & 0x03)));
1460
1461 tptr++;
1462
1463 ND_PRINT((ndo, "\n\t Digest: "));
1464
1465 for(i=1;i<=8; i++)
1466 {
1467 ND_PRINT((ndo, "%08x ", EXTRACT_32BITS(tptr)));
1468 if (i%4 == 0 && i != 8)
1469 ND_PRINT((ndo, "\n\t "));
1470 tptr = tptr + 4;
1471 }
1472
1473 len = len - ISIS_SUBTLV_SPB_DIGEST_MIN_LEN;
1474 stlv_len = stlv_len - ISIS_SUBTLV_SPB_DIGEST_MIN_LEN;
1475
1476 break;
1477 }
1478
1479 case ISIS_SUBTLV_SPB_BVID:
1480 {
1481 while (stlv_len >= ISIS_SUBTLV_SPB_BVID_MIN_LEN)
1482 {
1483 ND_PRINT((ndo, "\n\t ECT: %08x",
1484 EXTRACT_32BITS(tptr)));
1485
1486 tptr = tptr+4;
1487
1488 ND_PRINT((ndo, " BVID: %d, U:%01x M:%01x ",
1489 (EXTRACT_16BITS (tptr) >> 4) ,
1490 (EXTRACT_16BITS (tptr) >> 3) & 0x01,
1491 (EXTRACT_16BITS (tptr) >> 2) & 0x01));
1492
1493 tptr = tptr + 2;
1494 len = len - ISIS_SUBTLV_SPB_BVID_MIN_LEN;
1495 stlv_len = stlv_len - ISIS_SUBTLV_SPB_BVID_MIN_LEN;
1496 }
1497
1498 break;
1499 }
1500
1501 default:
1502 break;
1503 }
1504 tptr += stlv_len;
1505 len -= stlv_len;
1506 }
1507
1508 return 0;
1509
1510 trunc:
1511 ND_PRINT((ndo, "\n\t\t"));
1512 ND_PRINT((ndo, "%s", tstr));
1513 return(1);
1514 }
1515
1516 static int
isis_print_mt_capability_subtlv(netdissect_options * ndo,const uint8_t * tptr,int len)1517 isis_print_mt_capability_subtlv(netdissect_options *ndo,
1518 const uint8_t *tptr, int len)
1519 {
1520 int stlv_type, stlv_len, tmp;
1521
1522 while (len > 2)
1523 {
1524 ND_TCHECK2(*tptr, 2);
1525 stlv_type = *(tptr++);
1526 stlv_len = *(tptr++);
1527
1528 /* first lets see if we know the subTLVs name*/
1529 ND_PRINT((ndo, "\n\t %s subTLV #%u, length: %u",
1530 tok2str(isis_mt_capability_subtlv_values, "unknown", stlv_type),
1531 stlv_type,
1532 stlv_len));
1533
1534 len = len - 2;
1535
1536 /* Make sure the subTLV fits within the space left */
1537 if (len < stlv_len)
1538 goto trunc;
1539 /* Make sure the entire subTLV is in the captured data */
1540 ND_TCHECK2(*(tptr), stlv_len);
1541
1542 switch (stlv_type)
1543 {
1544 case ISIS_SUBTLV_SPB_INSTANCE:
1545 if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN)
1546 goto trunc;
1547
1548 ND_PRINT((ndo, "\n\t CIST Root-ID: %08x", EXTRACT_32BITS(tptr)));
1549 tptr = tptr+4;
1550 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tptr)));
1551 tptr = tptr+4;
1552 ND_PRINT((ndo, ", Path Cost: %08x", EXTRACT_32BITS(tptr)));
1553 tptr = tptr+4;
1554 ND_PRINT((ndo, ", Prio: %d", EXTRACT_16BITS(tptr)));
1555 tptr = tptr + 2;
1556 ND_PRINT((ndo, "\n\t RES: %d",
1557 EXTRACT_16BITS(tptr) >> 5));
1558 ND_PRINT((ndo, ", V: %d",
1559 (EXTRACT_16BITS(tptr) >> 4) & 0x0001));
1560 ND_PRINT((ndo, ", SPSource-ID: %d",
1561 (EXTRACT_32BITS(tptr) & 0x000fffff)));
1562 tptr = tptr+4;
1563 ND_PRINT((ndo, ", No of Trees: %x", *(tptr)));
1564
1565 tmp = *(tptr++);
1566
1567 len = len - ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN;
1568 stlv_len = stlv_len - ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN;
1569
1570 while (tmp)
1571 {
1572 if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN)
1573 goto trunc;
1574
1575 ND_PRINT((ndo, "\n\t U:%d, M:%d, A:%d, RES:%d",
1576 *(tptr) >> 7, (*(tptr) >> 6) & 0x01,
1577 (*(tptr) >> 5) & 0x01, (*(tptr) & 0x1f)));
1578
1579 tptr++;
1580
1581 ND_PRINT((ndo, ", ECT: %08x", EXTRACT_32BITS(tptr)));
1582
1583 tptr = tptr + 4;
1584
1585 ND_PRINT((ndo, ", BVID: %d, SPVID: %d",
1586 (EXTRACT_24BITS(tptr) >> 12) & 0x000fff,
1587 EXTRACT_24BITS(tptr) & 0x000fff));
1588
1589 tptr = tptr + 3;
1590 len = len - ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN;
1591 stlv_len = stlv_len - ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN;
1592 tmp--;
1593 }
1594
1595 break;
1596
1597 case ISIS_SUBTLV_SPBM_SI:
1598 if (stlv_len < 8)
1599 goto trunc;
1600
1601 ND_PRINT((ndo, "\n\t BMAC: %08x", EXTRACT_32BITS(tptr)));
1602 tptr = tptr+4;
1603 ND_PRINT((ndo, "%04x", EXTRACT_16BITS(tptr)));
1604 tptr = tptr+2;
1605
1606 ND_PRINT((ndo, ", RES: %d, VID: %d", EXTRACT_16BITS(tptr) >> 12,
1607 (EXTRACT_16BITS(tptr)) & 0x0fff));
1608
1609 tptr = tptr+2;
1610 len = len - 8;
1611 stlv_len = stlv_len - 8;
1612
1613 while (stlv_len >= 4) {
1614 ND_TCHECK2(*tptr, 4);
1615 ND_PRINT((ndo, "\n\t T: %d, R: %d, RES: %d, ISID: %d",
1616 (EXTRACT_32BITS(tptr) >> 31),
1617 (EXTRACT_32BITS(tptr) >> 30) & 0x01,
1618 (EXTRACT_32BITS(tptr) >> 24) & 0x03f,
1619 (EXTRACT_32BITS(tptr)) & 0x0ffffff));
1620
1621 tptr = tptr + 4;
1622 len = len - 4;
1623 stlv_len = stlv_len - 4;
1624 }
1625
1626 break;
1627
1628 default:
1629 break;
1630 }
1631 tptr += stlv_len;
1632 len -= stlv_len;
1633 }
1634 return 0;
1635
1636 trunc:
1637 ND_PRINT((ndo, "\n\t\t"));
1638 ND_PRINT((ndo, "%s", tstr));
1639 return(1);
1640 }
1641
1642 /* shared routine for printing system, node and lsp-ids */
1643 static char *
isis_print_id(const uint8_t * cp,int id_len)1644 isis_print_id(const uint8_t *cp, int id_len)
1645 {
1646 int i;
1647 static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")];
1648 char *pos = id;
1649 int sysid_len;
1650
1651 sysid_len = SYSTEM_ID_LEN;
1652 if (sysid_len > id_len)
1653 sysid_len = id_len;
1654 for (i = 1; i <= sysid_len; i++) {
1655 snprintf(pos, sizeof(id) - (pos - id), "%02x", *cp++);
1656 pos += strlen(pos);
1657 if (i == 2 || i == 4)
1658 *pos++ = '.';
1659 }
1660 if (id_len >= NODE_ID_LEN) {
1661 snprintf(pos, sizeof(id) - (pos - id), ".%02x", *cp++);
1662 pos += strlen(pos);
1663 }
1664 if (id_len == LSP_ID_LEN)
1665 snprintf(pos, sizeof(id) - (pos - id), "-%02x", *cp);
1666 return (id);
1667 }
1668
1669 /* print the 4-byte metric block which is common found in the old-style TLVs */
1670 static int
isis_print_metric_block(netdissect_options * ndo,const struct isis_metric_block * isis_metric_block)1671 isis_print_metric_block(netdissect_options *ndo,
1672 const struct isis_metric_block *isis_metric_block)
1673 {
1674 ND_PRINT((ndo, ", Default Metric: %d, %s",
1675 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default),
1676 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal"));
1677 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay))
1678 ND_PRINT((ndo, "\n\t\t Delay Metric: %d, %s",
1679 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay),
1680 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal"));
1681 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense))
1682 ND_PRINT((ndo, "\n\t\t Expense Metric: %d, %s",
1683 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense),
1684 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal"));
1685 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error))
1686 ND_PRINT((ndo, "\n\t\t Error Metric: %d, %s",
1687 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error),
1688 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal"));
1689
1690 return(1); /* everything is ok */
1691 }
1692
1693 static int
isis_print_tlv_ip_reach(netdissect_options * ndo,const uint8_t * cp,const char * ident,int length)1694 isis_print_tlv_ip_reach(netdissect_options *ndo,
1695 const uint8_t *cp, const char *ident, int length)
1696 {
1697 int prefix_len;
1698 const struct isis_tlv_ip_reach *tlv_ip_reach;
1699
1700 tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp;
1701
1702 while (length > 0) {
1703 if ((size_t)length < sizeof(*tlv_ip_reach)) {
1704 ND_PRINT((ndo, "short IPv4 Reachability (%d vs %lu)",
1705 length,
1706 (unsigned long)sizeof(*tlv_ip_reach)));
1707 return (0);
1708 }
1709
1710 if (!ND_TTEST(*tlv_ip_reach))
1711 return (0);
1712
1713 prefix_len = mask2plen(EXTRACT_32BITS(tlv_ip_reach->mask));
1714
1715 if (prefix_len == -1)
1716 ND_PRINT((ndo, "%sIPv4 prefix: %s mask %s",
1717 ident,
1718 ipaddr_string(ndo, (tlv_ip_reach->prefix)),
1719 ipaddr_string(ndo, (tlv_ip_reach->mask))));
1720 else
1721 ND_PRINT((ndo, "%sIPv4 prefix: %15s/%u",
1722 ident,
1723 ipaddr_string(ndo, (tlv_ip_reach->prefix)),
1724 prefix_len));
1725
1726 ND_PRINT((ndo, ", Distribution: %s, Metric: %u, %s",
1727 ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up",
1728 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default),
1729 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal"));
1730
1731 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay))
1732 ND_PRINT((ndo, "%s Delay Metric: %u, %s",
1733 ident,
1734 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay),
1735 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal"));
1736
1737 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense))
1738 ND_PRINT((ndo, "%s Expense Metric: %u, %s",
1739 ident,
1740 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense),
1741 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal"));
1742
1743 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error))
1744 ND_PRINT((ndo, "%s Error Metric: %u, %s",
1745 ident,
1746 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error),
1747 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal"));
1748
1749 length -= sizeof(struct isis_tlv_ip_reach);
1750 tlv_ip_reach++;
1751 }
1752 return (1);
1753 }
1754
1755 /*
1756 * this is the common IP-REACH subTLV decoder it is called
1757 * from various EXTD-IP REACH TLVs (135,235,236,237)
1758 */
1759
1760 static int
isis_print_ip_reach_subtlv(netdissect_options * ndo,const uint8_t * tptr,int subt,int subl,const char * ident)1761 isis_print_ip_reach_subtlv(netdissect_options *ndo,
1762 const uint8_t *tptr, int subt, int subl,
1763 const char *ident)
1764 {
1765 /* first lets see if we know the subTLVs name*/
1766 ND_PRINT((ndo, "%s%s subTLV #%u, length: %u",
1767 ident, tok2str(isis_ext_ip_reach_subtlv_values, "unknown", subt),
1768 subt, subl));
1769
1770 ND_TCHECK2(*tptr,subl);
1771
1772 switch(subt) {
1773 case ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR: /* fall through */
1774 case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32:
1775 while (subl >= 4) {
1776 ND_PRINT((ndo, ", 0x%08x (=%u)",
1777 EXTRACT_32BITS(tptr),
1778 EXTRACT_32BITS(tptr)));
1779 tptr+=4;
1780 subl-=4;
1781 }
1782 break;
1783 case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64:
1784 while (subl >= 8) {
1785 ND_PRINT((ndo, ", 0x%08x%08x",
1786 EXTRACT_32BITS(tptr),
1787 EXTRACT_32BITS(tptr+4)));
1788 tptr+=8;
1789 subl-=8;
1790 }
1791 break;
1792 default:
1793 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl))
1794 return(0);
1795 break;
1796 }
1797 return(1);
1798
1799 trunc:
1800 ND_PRINT((ndo, "%s", ident));
1801 ND_PRINT((ndo, "%s", tstr));
1802 return(0);
1803 }
1804
1805 /*
1806 * this is the common IS-REACH subTLV decoder it is called
1807 * from isis_print_ext_is_reach()
1808 */
1809
1810 static int
isis_print_is_reach_subtlv(netdissect_options * ndo,const uint8_t * tptr,u_int subt,u_int subl,const char * ident)1811 isis_print_is_reach_subtlv(netdissect_options *ndo,
1812 const uint8_t *tptr, u_int subt, u_int subl,
1813 const char *ident)
1814 {
1815 u_int te_class,priority_level,gmpls_switch_cap;
1816 union { /* int to float conversion buffer for several subTLVs */
1817 float f;
1818 uint32_t i;
1819 } bw;
1820
1821 /* first lets see if we know the subTLVs name*/
1822 ND_PRINT((ndo, "%s%s subTLV #%u, length: %u",
1823 ident, tok2str(isis_ext_is_reach_subtlv_values, "unknown", subt),
1824 subt, subl));
1825
1826 ND_TCHECK2(*tptr, subl);
1827
1828 switch(subt) {
1829 case ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP:
1830 case ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID:
1831 case ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
1832 if (subl >= 4) {
1833 ND_PRINT((ndo, ", 0x%08x", EXTRACT_32BITS(tptr)));
1834 if (subl == 8) /* rfc4205 */
1835 ND_PRINT((ndo, ", 0x%08x", EXTRACT_32BITS(tptr+4)));
1836 }
1837 break;
1838 case ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
1839 case ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
1840 if (subl >= sizeof(struct in_addr))
1841 ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr)));
1842 break;
1843 case ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
1844 case ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW:
1845 if (subl >= 4) {
1846 bw.i = EXTRACT_32BITS(tptr);
1847 ND_PRINT((ndo, ", %.3f Mbps", bw.f * 8 / 1000000));
1848 }
1849 break;
1850 case ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
1851 if (subl >= 32) {
1852 for (te_class = 0; te_class < 8; te_class++) {
1853 bw.i = EXTRACT_32BITS(tptr);
1854 ND_PRINT((ndo, "%s TE-Class %u: %.3f Mbps",
1855 ident,
1856 te_class,
1857 bw.f * 8 / 1000000));
1858 tptr+=4;
1859 }
1860 }
1861 break;
1862 case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS: /* fall through */
1863 case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD:
1864 if (subl == 0)
1865 break;
1866 ND_PRINT((ndo, "%sBandwidth Constraints Model ID: %s (%u)",
1867 ident,
1868 tok2str(diffserv_te_bc_values, "unknown", *tptr),
1869 *tptr));
1870 tptr++;
1871 /* decode BCs until the subTLV ends */
1872 for (te_class = 0; te_class < (subl-1)/4; te_class++) {
1873 bw.i = EXTRACT_32BITS(tptr);
1874 ND_PRINT((ndo, "%s Bandwidth constraint CT%u: %.3f Mbps",
1875 ident,
1876 te_class,
1877 bw.f * 8 / 1000000));
1878 tptr+=4;
1879 }
1880 break;
1881 case ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC:
1882 if (subl >= 3)
1883 ND_PRINT((ndo, ", %u", EXTRACT_24BITS(tptr)));
1884 break;
1885 case ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE:
1886 if (subl == 2) {
1887 ND_PRINT((ndo, ", [ %s ] (0x%04x)",
1888 bittok2str(isis_subtlv_link_attribute_values,
1889 "Unknown",
1890 EXTRACT_16BITS(tptr)),
1891 EXTRACT_16BITS(tptr)));
1892 }
1893 break;
1894 case ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
1895 if (subl >= 2) {
1896 ND_PRINT((ndo, ", %s, Priority %u",
1897 bittok2str(gmpls_link_prot_values, "none", *tptr),
1898 *(tptr+1)));
1899 }
1900 break;
1901 case ISIS_SUBTLV_SPB_METRIC:
1902 if (subl >= 6) {
1903 ND_PRINT((ndo, ", LM: %u", EXTRACT_24BITS(tptr)));
1904 tptr=tptr+3;
1905 ND_PRINT((ndo, ", P: %u", *(tptr)));
1906 tptr++;
1907 ND_PRINT((ndo, ", P-ID: %u", EXTRACT_16BITS(tptr)));
1908 }
1909 break;
1910 case ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
1911 if (subl >= 36) {
1912 gmpls_switch_cap = *tptr;
1913 ND_PRINT((ndo, "%s Interface Switching Capability:%s",
1914 ident,
1915 tok2str(gmpls_switch_cap_values, "Unknown", gmpls_switch_cap)));
1916 ND_PRINT((ndo, ", LSP Encoding: %s",
1917 tok2str(gmpls_encoding_values, "Unknown", *(tptr + 1))));
1918 tptr+=4;
1919 ND_PRINT((ndo, "%s Max LSP Bandwidth:", ident));
1920 for (priority_level = 0; priority_level < 8; priority_level++) {
1921 bw.i = EXTRACT_32BITS(tptr);
1922 ND_PRINT((ndo, "%s priority level %d: %.3f Mbps",
1923 ident,
1924 priority_level,
1925 bw.f * 8 / 1000000));
1926 tptr+=4;
1927 }
1928 subl-=36;
1929 switch (gmpls_switch_cap) {
1930 case GMPLS_PSC1:
1931 case GMPLS_PSC2:
1932 case GMPLS_PSC3:
1933 case GMPLS_PSC4:
1934 if (subl < 6)
1935 break;
1936 bw.i = EXTRACT_32BITS(tptr);
1937 ND_PRINT((ndo, "%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f * 8 / 1000000));
1938 ND_PRINT((ndo, "%s Interface MTU: %u", ident, EXTRACT_16BITS(tptr + 4)));
1939 break;
1940 case GMPLS_TSC:
1941 if (subl < 8)
1942 break;
1943 bw.i = EXTRACT_32BITS(tptr);
1944 ND_PRINT((ndo, "%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f * 8 / 1000000));
1945 ND_PRINT((ndo, "%s Indication %s", ident,
1946 tok2str(gmpls_switch_cap_tsc_indication_values, "Unknown (%u)", *(tptr + 4))));
1947 break;
1948 default:
1949 /* there is some optional stuff left to decode but this is as of yet
1950 not specified so just lets hexdump what is left */
1951 if(subl>0){
1952 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl))
1953 return(0);
1954 }
1955 }
1956 }
1957 break;
1958 default:
1959 if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl))
1960 return(0);
1961 break;
1962 }
1963 return(1);
1964
1965 trunc:
1966 return(0);
1967 }
1968
1969 /*
1970 * this is the common IS-REACH decoder it is called
1971 * from various EXTD-IS REACH style TLVs (22,24,222)
1972 */
1973
1974 static int
isis_print_ext_is_reach(netdissect_options * ndo,const uint8_t * tptr,const char * ident,int tlv_type)1975 isis_print_ext_is_reach(netdissect_options *ndo,
1976 const uint8_t *tptr, const char *ident, int tlv_type)
1977 {
1978 char ident_buffer[20];
1979 int subtlv_type,subtlv_len,subtlv_sum_len;
1980 int proc_bytes = 0; /* how many bytes did we process ? */
1981
1982 if (!ND_TTEST2(*tptr, NODE_ID_LEN))
1983 return(0);
1984
1985 ND_PRINT((ndo, "%sIS Neighbor: %s", ident, isis_print_id(tptr, NODE_ID_LEN)));
1986 tptr+=(NODE_ID_LEN);
1987
1988 if (tlv_type != ISIS_TLV_IS_ALIAS_ID) { /* the Alias TLV Metric field is implicit 0 */
1989 if (!ND_TTEST2(*tptr, 3)) /* and is therefore skipped */
1990 return(0);
1991 ND_PRINT((ndo, ", Metric: %d", EXTRACT_24BITS(tptr)));
1992 tptr+=3;
1993 }
1994
1995 if (!ND_TTEST2(*tptr, 1))
1996 return(0);
1997 subtlv_sum_len=*(tptr++); /* read out subTLV length */
1998 proc_bytes=NODE_ID_LEN+3+1;
1999 ND_PRINT((ndo, ", %ssub-TLVs present",subtlv_sum_len ? "" : "no "));
2000 if (subtlv_sum_len) {
2001 ND_PRINT((ndo, " (%u)", subtlv_sum_len));
2002 while (subtlv_sum_len>0) {
2003 if (!ND_TTEST2(*tptr,2))
2004 return(0);
2005 subtlv_type=*(tptr++);
2006 subtlv_len=*(tptr++);
2007 /* prepend the indent string */
2008 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident);
2009 if (!isis_print_is_reach_subtlv(ndo, tptr, subtlv_type, subtlv_len, ident_buffer))
2010 return(0);
2011 tptr+=subtlv_len;
2012 subtlv_sum_len-=(subtlv_len+2);
2013 proc_bytes+=(subtlv_len+2);
2014 }
2015 }
2016 return(proc_bytes);
2017 }
2018
2019 /*
2020 * this is the common Multi Topology ID decoder
2021 * it is called from various MT-TLVs (222,229,235,237)
2022 */
2023
2024 static int
isis_print_mtid(netdissect_options * ndo,const uint8_t * tptr,const char * ident)2025 isis_print_mtid(netdissect_options *ndo,
2026 const uint8_t *tptr, const char *ident)
2027 {
2028 if (!ND_TTEST2(*tptr, 2))
2029 return(0);
2030
2031 ND_PRINT((ndo, "%s%s",
2032 ident,
2033 tok2str(isis_mt_values,
2034 "Reserved for IETF Consensus",
2035 ISIS_MASK_MTID(EXTRACT_16BITS(tptr)))));
2036
2037 ND_PRINT((ndo, " Topology (0x%03x), Flags: [%s]",
2038 ISIS_MASK_MTID(EXTRACT_16BITS(tptr)),
2039 bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(EXTRACT_16BITS(tptr)))));
2040
2041 return(2);
2042 }
2043
2044 /*
2045 * this is the common extended IP reach decoder
2046 * it is called from TLVs (135,235,236,237)
2047 * we process the TLV and optional subTLVs and return
2048 * the amount of processed bytes
2049 */
2050
2051 static int
isis_print_extd_ip_reach(netdissect_options * ndo,const uint8_t * tptr,const char * ident,uint16_t afi)2052 isis_print_extd_ip_reach(netdissect_options *ndo,
2053 const uint8_t *tptr, const char *ident, uint16_t afi)
2054 {
2055 char ident_buffer[20];
2056 uint8_t prefix[sizeof(struct in6_addr)]; /* shared copy buffer for IPv4 and IPv6 prefixes */
2057 u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen;
2058
2059 if (!ND_TTEST2(*tptr, 4))
2060 return (0);
2061 metric = EXTRACT_32BITS(tptr);
2062 processed=4;
2063 tptr+=4;
2064
2065 if (afi == AF_INET) {
2066 if (!ND_TTEST2(*tptr, 1)) /* fetch status byte */
2067 return (0);
2068 status_byte=*(tptr++);
2069 bit_length = status_byte&0x3f;
2070 if (bit_length > 32) {
2071 ND_PRINT((ndo, "%sIPv4 prefix: bad bit length %u",
2072 ident,
2073 bit_length));
2074 return (0);
2075 }
2076 processed++;
2077 } else if (afi == AF_INET6) {
2078 if (!ND_TTEST2(*tptr, 2)) /* fetch status & prefix_len byte */
2079 return (0);
2080 status_byte=*(tptr++);
2081 bit_length=*(tptr++);
2082 if (bit_length > 128) {
2083 ND_PRINT((ndo, "%sIPv6 prefix: bad bit length %u",
2084 ident,
2085 bit_length));
2086 return (0);
2087 }
2088 processed+=2;
2089 } else
2090 return (0); /* somebody is fooling us */
2091
2092 byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
2093
2094 if (!ND_TTEST2(*tptr, byte_length))
2095 return (0);
2096 memset(prefix, 0, sizeof prefix); /* clear the copy buffer */
2097 memcpy(prefix,tptr,byte_length); /* copy as much as is stored in the TLV */
2098 tptr+=byte_length;
2099 processed+=byte_length;
2100
2101 if (afi == AF_INET)
2102 ND_PRINT((ndo, "%sIPv4 prefix: %15s/%u",
2103 ident,
2104 ipaddr_string(ndo, prefix),
2105 bit_length));
2106 else if (afi == AF_INET6)
2107 ND_PRINT((ndo, "%sIPv6 prefix: %s/%u",
2108 ident,
2109 ip6addr_string(ndo, prefix),
2110 bit_length));
2111
2112 ND_PRINT((ndo, ", Distribution: %s, Metric: %u",
2113 ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up",
2114 metric));
2115
2116 if (afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
2117 ND_PRINT((ndo, ", sub-TLVs present"));
2118 else if (afi == AF_INET6)
2119 ND_PRINT((ndo, ", %s%s",
2120 ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal",
2121 ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : ""));
2122
2123 if ((afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
2124 || (afi == AF_INET6 && ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte))
2125 ) {
2126 /* assume that one prefix can hold more
2127 than one subTLV - therefore the first byte must reflect
2128 the aggregate bytecount of the subTLVs for this prefix
2129 */
2130 if (!ND_TTEST2(*tptr, 1))
2131 return (0);
2132 sublen=*(tptr++);
2133 processed+=sublen+1;
2134 ND_PRINT((ndo, " (%u)", sublen)); /* print out subTLV length */
2135
2136 while (sublen>0) {
2137 if (!ND_TTEST2(*tptr,2))
2138 return (0);
2139 subtlvtype=*(tptr++);
2140 subtlvlen=*(tptr++);
2141 /* prepend the indent string */
2142 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident);
2143 if (!isis_print_ip_reach_subtlv(ndo, tptr, subtlvtype, subtlvlen, ident_buffer))
2144 return(0);
2145 tptr+=subtlvlen;
2146 sublen-=(subtlvlen+2);
2147 }
2148 }
2149 return (processed);
2150 }
2151
2152 /*
2153 * Clear checksum and lifetime prior to signature verification.
2154 */
2155 static void
isis_clear_checksum_lifetime(void * header)2156 isis_clear_checksum_lifetime(void *header)
2157 {
2158 struct isis_lsp_header *header_lsp = (struct isis_lsp_header *) header;
2159
2160 header_lsp->checksum[0] = 0;
2161 header_lsp->checksum[1] = 0;
2162 header_lsp->remaining_lifetime[0] = 0;
2163 header_lsp->remaining_lifetime[1] = 0;
2164 }
2165
2166 /*
2167 * isis_print
2168 * Decode IS-IS packets. Return 0 on error.
2169 */
2170
2171 static int
isis_print(netdissect_options * ndo,const uint8_t * p,u_int length)2172 isis_print(netdissect_options *ndo,
2173 const uint8_t *p, u_int length)
2174 {
2175 const struct isis_common_header *isis_header;
2176
2177 const struct isis_iih_lan_header *header_iih_lan;
2178 const struct isis_iih_ptp_header *header_iih_ptp;
2179 const struct isis_lsp_header *header_lsp;
2180 const struct isis_csnp_header *header_csnp;
2181 const struct isis_psnp_header *header_psnp;
2182
2183 const struct isis_tlv_lsp *tlv_lsp;
2184 const struct isis_tlv_ptp_adj *tlv_ptp_adj;
2185 const struct isis_tlv_is_reach *tlv_is_reach;
2186 const struct isis_tlv_es_reach *tlv_es_reach;
2187
2188 uint8_t pdu_type, max_area, id_length, tlv_type, tlv_len, tmp, alen, lan_alen, prefix_len;
2189 uint8_t ext_is_len, ext_ip_len, mt_len;
2190 const uint8_t *optr, *pptr, *tptr;
2191 u_short packet_len,pdu_len, key_id;
2192 u_int i,vendor_id;
2193 int sigcheck;
2194
2195 packet_len=length;
2196 optr = p; /* initialize the _o_riginal pointer to the packet start -
2197 need it for parsing the checksum TLV and authentication
2198 TLV verification */
2199 isis_header = (const struct isis_common_header *)p;
2200 ND_TCHECK(*isis_header);
2201 if (length < ISIS_COMMON_HEADER_SIZE)
2202 goto trunc;
2203 pptr = p+(ISIS_COMMON_HEADER_SIZE);
2204 header_iih_lan = (const struct isis_iih_lan_header *)pptr;
2205 header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
2206 header_lsp = (const struct isis_lsp_header *)pptr;
2207 header_csnp = (const struct isis_csnp_header *)pptr;
2208 header_psnp = (const struct isis_psnp_header *)pptr;
2209
2210 if (!ndo->ndo_eflag)
2211 ND_PRINT((ndo, "IS-IS"));
2212
2213 /*
2214 * Sanity checking of the header.
2215 */
2216
2217 if (isis_header->version != ISIS_VERSION) {
2218 ND_PRINT((ndo, "version %d packet not supported", isis_header->version));
2219 return (0);
2220 }
2221
2222 if ((isis_header->id_length != SYSTEM_ID_LEN) && (isis_header->id_length != 0)) {
2223 ND_PRINT((ndo, "system ID length of %d is not supported",
2224 isis_header->id_length));
2225 return (0);
2226 }
2227
2228 if (isis_header->pdu_version != ISIS_VERSION) {
2229 ND_PRINT((ndo, "version %d packet not supported", isis_header->pdu_version));
2230 return (0);
2231 }
2232
2233 if (length < isis_header->fixed_len) {
2234 ND_PRINT((ndo, "fixed header length %u > packet length %u", isis_header->fixed_len, length));
2235 return (0);
2236 }
2237
2238 if (isis_header->fixed_len < ISIS_COMMON_HEADER_SIZE) {
2239 ND_PRINT((ndo, "fixed header length %u < minimum header size %u", isis_header->fixed_len, (u_int)ISIS_COMMON_HEADER_SIZE));
2240 return (0);
2241 }
2242
2243 max_area = isis_header->max_area;
2244 switch(max_area) {
2245 case 0:
2246 max_area = 3; /* silly shit */
2247 break;
2248 case 255:
2249 ND_PRINT((ndo, "bad packet -- 255 areas"));
2250 return (0);
2251 default:
2252 break;
2253 }
2254
2255 id_length = isis_header->id_length;
2256 switch(id_length) {
2257 case 0:
2258 id_length = 6; /* silly shit again */
2259 break;
2260 case 1: /* 1-8 are valid sys-ID lenghts */
2261 case 2:
2262 case 3:
2263 case 4:
2264 case 5:
2265 case 6:
2266 case 7:
2267 case 8:
2268 break;
2269 case 255:
2270 id_length = 0; /* entirely useless */
2271 break;
2272 default:
2273 break;
2274 }
2275
2276 /* toss any non 6-byte sys-ID len PDUs */
2277 if (id_length != 6 ) {
2278 ND_PRINT((ndo, "bad packet -- illegal sys-ID length (%u)", id_length));
2279 return (0);
2280 }
2281
2282 pdu_type=isis_header->pdu_type;
2283
2284 /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/
2285 if (ndo->ndo_vflag == 0) {
2286 ND_PRINT((ndo, "%s%s",
2287 ndo->ndo_eflag ? "" : ", ",
2288 tok2str(isis_pdu_values, "unknown PDU-Type %u", pdu_type)));
2289 } else {
2290 /* ok they seem to want to know everything - lets fully decode it */
2291 ND_PRINT((ndo, "%slength %u", ndo->ndo_eflag ? "" : ", ", length));
2292
2293 ND_PRINT((ndo, "\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)",
2294 tok2str(isis_pdu_values,
2295 "unknown, type %u",
2296 pdu_type),
2297 isis_header->fixed_len,
2298 isis_header->version,
2299 isis_header->pdu_version,
2300 id_length,
2301 isis_header->id_length,
2302 max_area,
2303 isis_header->max_area));
2304
2305 if (ndo->ndo_vflag > 1) {
2306 if (!print_unknown_data(ndo, optr, "\n\t", 8)) /* provide the _o_riginal pointer */
2307 return (0); /* for optionally debugging the common header */
2308 }
2309 }
2310
2311 switch (pdu_type) {
2312
2313 case ISIS_PDU_L1_LAN_IIH:
2314 case ISIS_PDU_L2_LAN_IIH:
2315 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) {
2316 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu",
2317 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)));
2318 return (0);
2319 }
2320 ND_TCHECK(*header_iih_lan);
2321 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)
2322 goto trunc;
2323 if (ndo->ndo_vflag == 0) {
2324 ND_PRINT((ndo, ", src-id %s",
2325 isis_print_id(header_iih_lan->source_id, SYSTEM_ID_LEN)));
2326 ND_PRINT((ndo, ", lan-id %s, prio %u",
2327 isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN),
2328 header_iih_lan->priority));
2329 ND_PRINT((ndo, ", length %u", length));
2330 return (1);
2331 }
2332 pdu_len=EXTRACT_16BITS(header_iih_lan->pdu_len);
2333 if (packet_len>pdu_len) {
2334 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2335 length=pdu_len;
2336 }
2337
2338 ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]",
2339 isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN),
2340 EXTRACT_16BITS(header_iih_lan->holding_time),
2341 tok2str(isis_iih_circuit_type_values,
2342 "unknown circuit type 0x%02x",
2343 header_iih_lan->circuit_type)));
2344
2345 ND_PRINT((ndo, "\n\t lan-id: %s, Priority: %u, PDU length: %u",
2346 isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN),
2347 (header_iih_lan->priority) & ISIS_LAN_PRIORITY_MASK,
2348 pdu_len));
2349
2350 if (ndo->ndo_vflag > 1) {
2351 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_LAN_HEADER_SIZE))
2352 return (0);
2353 }
2354
2355 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
2356 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
2357 break;
2358
2359 case ISIS_PDU_PTP_IIH:
2360 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) {
2361 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu",
2362 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)));
2363 return (0);
2364 }
2365 ND_TCHECK(*header_iih_ptp);
2366 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)
2367 goto trunc;
2368 if (ndo->ndo_vflag == 0) {
2369 ND_PRINT((ndo, ", src-id %s", isis_print_id(header_iih_ptp->source_id, SYSTEM_ID_LEN)));
2370 ND_PRINT((ndo, ", length %u", length));
2371 return (1);
2372 }
2373 pdu_len=EXTRACT_16BITS(header_iih_ptp->pdu_len);
2374 if (packet_len>pdu_len) {
2375 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2376 length=pdu_len;
2377 }
2378
2379 ND_PRINT((ndo, "\n\t source-id: %s, holding time: %us, Flags: [%s]",
2380 isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN),
2381 EXTRACT_16BITS(header_iih_ptp->holding_time),
2382 tok2str(isis_iih_circuit_type_values,
2383 "unknown circuit type 0x%02x",
2384 header_iih_ptp->circuit_type)));
2385
2386 ND_PRINT((ndo, "\n\t circuit-id: 0x%02x, PDU length: %u",
2387 header_iih_ptp->circuit_id,
2388 pdu_len));
2389
2390 if (ndo->ndo_vflag > 1) {
2391 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_PTP_HEADER_SIZE))
2392 return (0);
2393 }
2394
2395 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
2396 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
2397 break;
2398
2399 case ISIS_PDU_L1_LSP:
2400 case ISIS_PDU_L2_LSP:
2401 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) {
2402 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu",
2403 isis_header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE));
2404 return (0);
2405 }
2406 ND_TCHECK(*header_lsp);
2407 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)
2408 goto trunc;
2409 if (ndo->ndo_vflag == 0) {
2410 ND_PRINT((ndo, ", lsp-id %s, seq 0x%08x, lifetime %5us",
2411 isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
2412 EXTRACT_32BITS(header_lsp->sequence_number),
2413 EXTRACT_16BITS(header_lsp->remaining_lifetime)));
2414 ND_PRINT((ndo, ", length %u", length));
2415 return (1);
2416 }
2417 pdu_len=EXTRACT_16BITS(header_lsp->pdu_len);
2418 if (packet_len>pdu_len) {
2419 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2420 length=pdu_len;
2421 }
2422
2423 ND_PRINT((ndo, "\n\t lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t chksum: 0x%04x",
2424 isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
2425 EXTRACT_32BITS(header_lsp->sequence_number),
2426 EXTRACT_16BITS(header_lsp->remaining_lifetime),
2427 EXTRACT_16BITS(header_lsp->checksum)));
2428
2429 osi_print_cksum(ndo, (const uint8_t *)header_lsp->lsp_id,
2430 EXTRACT_16BITS(header_lsp->checksum),
2431 12, length-12);
2432
2433 ND_PRINT((ndo, ", PDU length: %u, Flags: [ %s",
2434 pdu_len,
2435 ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : ""));
2436
2437 if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) {
2438 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : ""));
2439 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : ""));
2440 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : ""));
2441 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : ""));
2442 ND_PRINT((ndo, "ATT bit set, "));
2443 }
2444 ND_PRINT((ndo, "%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : ""));
2445 ND_PRINT((ndo, "%s ]", tok2str(isis_lsp_istype_values, "Unknown(0x%x)",
2446 ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock))));
2447
2448 if (ndo->ndo_vflag > 1) {
2449 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_LSP_HEADER_SIZE))
2450 return (0);
2451 }
2452
2453 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
2454 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
2455 break;
2456
2457 case ISIS_PDU_L1_CSNP:
2458 case ISIS_PDU_L2_CSNP:
2459 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) {
2460 ND_PRINT((ndo, ", bogus fixed header length %u should be %lu",
2461 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)));
2462 return (0);
2463 }
2464 ND_TCHECK(*header_csnp);
2465 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)
2466 goto trunc;
2467 if (ndo->ndo_vflag == 0) {
2468 ND_PRINT((ndo, ", src-id %s", isis_print_id(header_csnp->source_id, NODE_ID_LEN)));
2469 ND_PRINT((ndo, ", length %u", length));
2470 return (1);
2471 }
2472 pdu_len=EXTRACT_16BITS(header_csnp->pdu_len);
2473 if (packet_len>pdu_len) {
2474 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2475 length=pdu_len;
2476 }
2477
2478 ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u",
2479 isis_print_id(header_csnp->source_id, NODE_ID_LEN),
2480 pdu_len));
2481 ND_PRINT((ndo, "\n\t start lsp-id: %s",
2482 isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN)));
2483 ND_PRINT((ndo, "\n\t end lsp-id: %s",
2484 isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN)));
2485
2486 if (ndo->ndo_vflag > 1) {
2487 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_CSNP_HEADER_SIZE))
2488 return (0);
2489 }
2490
2491 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
2492 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
2493 break;
2494
2495 case ISIS_PDU_L1_PSNP:
2496 case ISIS_PDU_L2_PSNP:
2497 if (isis_header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) {
2498 ND_PRINT((ndo, "- bogus fixed header length %u should be %lu",
2499 isis_header->fixed_len, (unsigned long)(ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)));
2500 return (0);
2501 }
2502 ND_TCHECK(*header_psnp);
2503 if (length < ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)
2504 goto trunc;
2505 if (ndo->ndo_vflag == 0) {
2506 ND_PRINT((ndo, ", src-id %s", isis_print_id(header_psnp->source_id, NODE_ID_LEN)));
2507 ND_PRINT((ndo, ", length %u", length));
2508 return (1);
2509 }
2510 pdu_len=EXTRACT_16BITS(header_psnp->pdu_len);
2511 if (packet_len>pdu_len) {
2512 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
2513 length=pdu_len;
2514 }
2515
2516 ND_PRINT((ndo, "\n\t source-id: %s, PDU length: %u",
2517 isis_print_id(header_psnp->source_id, NODE_ID_LEN),
2518 pdu_len));
2519
2520 if (ndo->ndo_vflag > 1) {
2521 if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_PSNP_HEADER_SIZE))
2522 return (0);
2523 }
2524
2525 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
2526 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
2527 break;
2528
2529 default:
2530 if (ndo->ndo_vflag == 0) {
2531 ND_PRINT((ndo, ", length %u", length));
2532 return (1);
2533 }
2534 (void)print_unknown_data(ndo, pptr, "\n\t ", length);
2535 return (0);
2536 }
2537
2538 /*
2539 * Now print the TLV's.
2540 */
2541
2542 while (packet_len > 0) {
2543 ND_TCHECK2(*pptr, 2);
2544 if (packet_len < 2)
2545 goto trunc;
2546 tlv_type = *pptr++;
2547 tlv_len = *pptr++;
2548 tmp =tlv_len; /* copy temporary len & pointer to packet data */
2549 tptr = pptr;
2550 packet_len -= 2;
2551
2552 /* first lets see if we know the TLVs name*/
2553 ND_PRINT((ndo, "\n\t %s TLV #%u, length: %u",
2554 tok2str(isis_tlv_values,
2555 "unknown",
2556 tlv_type),
2557 tlv_type,
2558 tlv_len));
2559
2560 if (tlv_len == 0) /* something is invalid */
2561 continue;
2562
2563 if (packet_len < tlv_len)
2564 goto trunc;
2565
2566 /* now check if we have a decoder otherwise do a hexdump at the end*/
2567 switch (tlv_type) {
2568 case ISIS_TLV_AREA_ADDR:
2569 ND_TCHECK2(*tptr, 1);
2570 alen = *tptr++;
2571 while (tmp && alen < tmp) {
2572 ND_TCHECK2(*tptr, alen);
2573 ND_PRINT((ndo, "\n\t Area address (length: %u): %s",
2574 alen,
2575 isonsap_string(ndo, tptr, alen)));
2576 tptr += alen;
2577 tmp -= alen + 1;
2578 if (tmp==0) /* if this is the last area address do not attemt a boundary check */
2579 break;
2580 ND_TCHECK2(*tptr, 1);
2581 alen = *tptr++;
2582 }
2583 break;
2584 case ISIS_TLV_ISNEIGH:
2585 while (tmp >= ETHER_ADDR_LEN) {
2586 ND_TCHECK2(*tptr, ETHER_ADDR_LEN);
2587 ND_PRINT((ndo, "\n\t SNPA: %s", isis_print_id(tptr, ETHER_ADDR_LEN)));
2588 tmp -= ETHER_ADDR_LEN;
2589 tptr += ETHER_ADDR_LEN;
2590 }
2591 break;
2592
2593 case ISIS_TLV_ISNEIGH_VARLEN:
2594 if (!ND_TTEST2(*tptr, 1) || tmp < 3) /* min. TLV length */
2595 goto trunctlv;
2596 lan_alen = *tptr++; /* LAN address length */
2597 if (lan_alen == 0) {
2598 ND_PRINT((ndo, "\n\t LAN address length 0 bytes (invalid)"));
2599 break;
2600 }
2601 tmp --;
2602 ND_PRINT((ndo, "\n\t LAN address length %u bytes ", lan_alen));
2603 while (tmp >= lan_alen) {
2604 ND_TCHECK2(*tptr, lan_alen);
2605 ND_PRINT((ndo, "\n\t\tIS Neighbor: %s", isis_print_id(tptr, lan_alen)));
2606 tmp -= lan_alen;
2607 tptr +=lan_alen;
2608 }
2609 break;
2610
2611 case ISIS_TLV_PADDING:
2612 break;
2613
2614 case ISIS_TLV_MT_IS_REACH:
2615 mt_len = isis_print_mtid(ndo, tptr, "\n\t ");
2616 if (mt_len == 0) /* did something go wrong ? */
2617 goto trunctlv;
2618 tptr+=mt_len;
2619 tmp-=mt_len;
2620 while (tmp >= 2+NODE_ID_LEN+3+1) {
2621 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type);
2622 if (ext_is_len == 0) /* did something go wrong ? */
2623 goto trunctlv;
2624
2625 tmp-=ext_is_len;
2626 tptr+=ext_is_len;
2627 }
2628 break;
2629
2630 case ISIS_TLV_IS_ALIAS_ID:
2631 while (tmp >= NODE_ID_LEN+1) { /* is it worth attempting a decode ? */
2632 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type);
2633 if (ext_is_len == 0) /* did something go wrong ? */
2634 goto trunctlv;
2635 tmp-=ext_is_len;
2636 tptr+=ext_is_len;
2637 }
2638 break;
2639
2640 case ISIS_TLV_EXT_IS_REACH:
2641 while (tmp >= NODE_ID_LEN+3+1) { /* is it worth attempting a decode ? */
2642 ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type);
2643 if (ext_is_len == 0) /* did something go wrong ? */
2644 goto trunctlv;
2645 tmp-=ext_is_len;
2646 tptr+=ext_is_len;
2647 }
2648 break;
2649 case ISIS_TLV_IS_REACH:
2650 ND_TCHECK2(*tptr,1); /* check if there is one byte left to read out the virtual flag */
2651 ND_PRINT((ndo, "\n\t %s",
2652 tok2str(isis_is_reach_virtual_values,
2653 "bogus virtual flag 0x%02x",
2654 *tptr++)));
2655 tlv_is_reach = (const struct isis_tlv_is_reach *)tptr;
2656 while (tmp >= sizeof(struct isis_tlv_is_reach)) {
2657 ND_TCHECK(*tlv_is_reach);
2658 ND_PRINT((ndo, "\n\t IS Neighbor: %s",
2659 isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN)));
2660 isis_print_metric_block(ndo, &tlv_is_reach->isis_metric_block);
2661 tmp -= sizeof(struct isis_tlv_is_reach);
2662 tlv_is_reach++;
2663 }
2664 break;
2665
2666 case ISIS_TLV_ESNEIGH:
2667 tlv_es_reach = (const struct isis_tlv_es_reach *)tptr;
2668 while (tmp >= sizeof(struct isis_tlv_es_reach)) {
2669 ND_TCHECK(*tlv_es_reach);
2670 ND_PRINT((ndo, "\n\t ES Neighbor: %s",
2671 isis_print_id(tlv_es_reach->neighbor_sysid, SYSTEM_ID_LEN)));
2672 isis_print_metric_block(ndo, &tlv_es_reach->isis_metric_block);
2673 tmp -= sizeof(struct isis_tlv_es_reach);
2674 tlv_es_reach++;
2675 }
2676 break;
2677
2678 /* those two TLVs share the same format */
2679 case ISIS_TLV_INT_IP_REACH:
2680 case ISIS_TLV_EXT_IP_REACH:
2681 if (!isis_print_tlv_ip_reach(ndo, pptr, "\n\t ", tlv_len))
2682 return (1);
2683 break;
2684
2685 case ISIS_TLV_EXTD_IP_REACH:
2686 while (tmp>0) {
2687 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET);
2688 if (ext_ip_len == 0) /* did something go wrong ? */
2689 goto trunctlv;
2690 tptr+=ext_ip_len;
2691 tmp-=ext_ip_len;
2692 }
2693 break;
2694
2695 case ISIS_TLV_MT_IP_REACH:
2696 mt_len = isis_print_mtid(ndo, tptr, "\n\t ");
2697 if (mt_len == 0) { /* did something go wrong ? */
2698 goto trunctlv;
2699 }
2700 tptr+=mt_len;
2701 tmp-=mt_len;
2702
2703 while (tmp>0) {
2704 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET);
2705 if (ext_ip_len == 0) /* did something go wrong ? */
2706 goto trunctlv;
2707 tptr+=ext_ip_len;
2708 tmp-=ext_ip_len;
2709 }
2710 break;
2711
2712 case ISIS_TLV_IP6_REACH:
2713 while (tmp>0) {
2714 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET6);
2715 if (ext_ip_len == 0) /* did something go wrong ? */
2716 goto trunctlv;
2717 tptr+=ext_ip_len;
2718 tmp-=ext_ip_len;
2719 }
2720 break;
2721
2722 case ISIS_TLV_MT_IP6_REACH:
2723 mt_len = isis_print_mtid(ndo, tptr, "\n\t ");
2724 if (mt_len == 0) { /* did something go wrong ? */
2725 goto trunctlv;
2726 }
2727 tptr+=mt_len;
2728 tmp-=mt_len;
2729
2730 while (tmp>0) {
2731 ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET6);
2732 if (ext_ip_len == 0) /* did something go wrong ? */
2733 goto trunctlv;
2734 tptr+=ext_ip_len;
2735 tmp-=ext_ip_len;
2736 }
2737 break;
2738
2739 case ISIS_TLV_IP6ADDR:
2740 while (tmp>=sizeof(struct in6_addr)) {
2741 ND_TCHECK2(*tptr, sizeof(struct in6_addr));
2742
2743 ND_PRINT((ndo, "\n\t IPv6 interface address: %s",
2744 ip6addr_string(ndo, tptr)));
2745
2746 tptr += sizeof(struct in6_addr);
2747 tmp -= sizeof(struct in6_addr);
2748 }
2749 break;
2750 case ISIS_TLV_AUTH:
2751 ND_TCHECK2(*tptr, 1);
2752
2753 ND_PRINT((ndo, "\n\t %s: ",
2754 tok2str(isis_subtlv_auth_values,
2755 "unknown Authentication type 0x%02x",
2756 *tptr)));
2757
2758 switch (*tptr) {
2759 case ISIS_SUBTLV_AUTH_SIMPLE:
2760 if (fn_printzp(ndo, tptr + 1, tlv_len - 1, ndo->ndo_snapend))
2761 goto trunctlv;
2762 break;
2763 case ISIS_SUBTLV_AUTH_MD5:
2764 for(i=1;i<tlv_len;i++) {
2765 ND_TCHECK2(*(tptr + i), 1);
2766 ND_PRINT((ndo, "%02x", *(tptr + i)));
2767 }
2768 if (tlv_len != ISIS_SUBTLV_AUTH_MD5_LEN+1)
2769 ND_PRINT((ndo, ", (invalid subTLV) "));
2770
2771 sigcheck = signature_verify(ndo, optr, length, tptr + 1,
2772 isis_clear_checksum_lifetime,
2773 header_lsp);
2774 ND_PRINT((ndo, " (%s)", tok2str(signature_check_values, "Unknown", sigcheck)));
2775
2776 break;
2777 case ISIS_SUBTLV_AUTH_GENERIC:
2778 ND_TCHECK2(*(tptr + 1), 2);
2779 key_id = EXTRACT_16BITS((tptr+1));
2780 ND_PRINT((ndo, "%u, password: ", key_id));
2781 for(i=1 + sizeof(uint16_t);i<tlv_len;i++) {
2782 ND_TCHECK2(*(tptr + i), 1);
2783 ND_PRINT((ndo, "%02x", *(tptr + i)));
2784 }
2785 break;
2786 case ISIS_SUBTLV_AUTH_PRIVATE:
2787 default:
2788 if (!print_unknown_data(ndo, tptr + 1, "\n\t\t ", tlv_len - 1))
2789 return(0);
2790 break;
2791 }
2792 break;
2793
2794 case ISIS_TLV_PTP_ADJ:
2795 tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr;
2796 if(tmp>=1) {
2797 ND_TCHECK2(*tptr, 1);
2798 ND_PRINT((ndo, "\n\t Adjacency State: %s (%u)",
2799 tok2str(isis_ptp_adjancey_values, "unknown", *tptr),
2800 *tptr));
2801 tmp--;
2802 }
2803 if(tmp>sizeof(tlv_ptp_adj->extd_local_circuit_id)) {
2804 ND_TCHECK(tlv_ptp_adj->extd_local_circuit_id);
2805 ND_PRINT((ndo, "\n\t Extended Local circuit-ID: 0x%08x",
2806 EXTRACT_32BITS(tlv_ptp_adj->extd_local_circuit_id)));
2807 tmp-=sizeof(tlv_ptp_adj->extd_local_circuit_id);
2808 }
2809 if(tmp>=SYSTEM_ID_LEN) {
2810 ND_TCHECK2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN);
2811 ND_PRINT((ndo, "\n\t Neighbor System-ID: %s",
2812 isis_print_id(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN)));
2813 tmp-=SYSTEM_ID_LEN;
2814 }
2815 if(tmp>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) {
2816 ND_TCHECK(tlv_ptp_adj->neighbor_extd_local_circuit_id);
2817 ND_PRINT((ndo, "\n\t Neighbor Extended Local circuit-ID: 0x%08x",
2818 EXTRACT_32BITS(tlv_ptp_adj->neighbor_extd_local_circuit_id)));
2819 }
2820 break;
2821
2822 case ISIS_TLV_PROTOCOLS:
2823 ND_PRINT((ndo, "\n\t NLPID(s): "));
2824 while (tmp>0) {
2825 ND_TCHECK2(*(tptr), 1);
2826 ND_PRINT((ndo, "%s (0x%02x)",
2827 tok2str(nlpid_values,
2828 "unknown",
2829 *tptr),
2830 *tptr));
2831 if (tmp>1) /* further NPLIDs ? - put comma */
2832 ND_PRINT((ndo, ", "));
2833 tptr++;
2834 tmp--;
2835 }
2836 break;
2837
2838 case ISIS_TLV_MT_PORT_CAP:
2839 {
2840 ND_TCHECK2(*(tptr), 2);
2841
2842 ND_PRINT((ndo, "\n\t RES: %d, MTID(s): %d",
2843 (EXTRACT_16BITS (tptr) >> 12),
2844 (EXTRACT_16BITS (tptr) & 0x0fff)));
2845
2846 tmp = tmp-2;
2847 tptr = tptr+2;
2848
2849 if (tmp)
2850 isis_print_mt_port_cap_subtlv(ndo, tptr, tmp);
2851
2852 break;
2853 }
2854
2855 case ISIS_TLV_MT_CAPABILITY:
2856
2857 ND_TCHECK2(*(tptr), 2);
2858
2859 ND_PRINT((ndo, "\n\t O: %d, RES: %d, MTID(s): %d",
2860 (EXTRACT_16BITS(tptr) >> 15) & 0x01,
2861 (EXTRACT_16BITS(tptr) >> 12) & 0x07,
2862 EXTRACT_16BITS(tptr) & 0x0fff));
2863
2864 tmp = tmp-2;
2865 tptr = tptr+2;
2866
2867 if (tmp)
2868 isis_print_mt_capability_subtlv(ndo, tptr, tmp);
2869
2870 break;
2871
2872 case ISIS_TLV_TE_ROUTER_ID:
2873 ND_TCHECK2(*pptr, sizeof(struct in_addr));
2874 ND_PRINT((ndo, "\n\t Traffic Engineering Router ID: %s", ipaddr_string(ndo, pptr)));
2875 break;
2876
2877 case ISIS_TLV_IPADDR:
2878 while (tmp>=sizeof(struct in_addr)) {
2879 ND_TCHECK2(*tptr, sizeof(struct in_addr));
2880 ND_PRINT((ndo, "\n\t IPv4 interface address: %s", ipaddr_string(ndo, tptr)));
2881 tptr += sizeof(struct in_addr);
2882 tmp -= sizeof(struct in_addr);
2883 }
2884 break;
2885
2886 case ISIS_TLV_HOSTNAME:
2887 ND_PRINT((ndo, "\n\t Hostname: "));
2888 if (fn_printzp(ndo, tptr, tmp, ndo->ndo_snapend))
2889 goto trunctlv;
2890 break;
2891
2892 case ISIS_TLV_SHARED_RISK_GROUP:
2893 if (tmp < NODE_ID_LEN)
2894 break;
2895 ND_TCHECK2(*tptr, NODE_ID_LEN);
2896 ND_PRINT((ndo, "\n\t IS Neighbor: %s", isis_print_id(tptr, NODE_ID_LEN)));
2897 tptr+=(NODE_ID_LEN);
2898 tmp-=(NODE_ID_LEN);
2899
2900 if (tmp < 1)
2901 break;
2902 ND_TCHECK2(*tptr, 1);
2903 ND_PRINT((ndo, ", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered"));
2904 tmp--;
2905
2906 if (tmp < sizeof(struct in_addr))
2907 break;
2908 ND_TCHECK2(*tptr, sizeof(struct in_addr));
2909 ND_PRINT((ndo, "\n\t IPv4 interface address: %s", ipaddr_string(ndo, tptr)));
2910 tptr+=sizeof(struct in_addr);
2911 tmp-=sizeof(struct in_addr);
2912
2913 if (tmp < sizeof(struct in_addr))
2914 break;
2915 ND_TCHECK2(*tptr, sizeof(struct in_addr));
2916 ND_PRINT((ndo, "\n\t IPv4 neighbor address: %s", ipaddr_string(ndo, tptr)));
2917 tptr+=sizeof(struct in_addr);
2918 tmp-=sizeof(struct in_addr);
2919
2920 while (tmp>=4) {
2921 ND_TCHECK2(*tptr, 4);
2922 ND_PRINT((ndo, "\n\t Link-ID: 0x%08x", EXTRACT_32BITS(tptr)));
2923 tptr+=4;
2924 tmp-=4;
2925 }
2926 break;
2927
2928 case ISIS_TLV_LSP:
2929 tlv_lsp = (const struct isis_tlv_lsp *)tptr;
2930 while(tmp>=sizeof(struct isis_tlv_lsp)) {
2931 ND_TCHECK((tlv_lsp->lsp_id)[LSP_ID_LEN-1]);
2932 ND_PRINT((ndo, "\n\t lsp-id: %s",
2933 isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN)));
2934 ND_TCHECK2(tlv_lsp->sequence_number, 4);
2935 ND_PRINT((ndo, ", seq: 0x%08x", EXTRACT_32BITS(tlv_lsp->sequence_number)));
2936 ND_TCHECK2(tlv_lsp->remaining_lifetime, 2);
2937 ND_PRINT((ndo, ", lifetime: %5ds", EXTRACT_16BITS(tlv_lsp->remaining_lifetime)));
2938 ND_TCHECK2(tlv_lsp->checksum, 2);
2939 ND_PRINT((ndo, ", chksum: 0x%04x", EXTRACT_16BITS(tlv_lsp->checksum)));
2940 tmp-=sizeof(struct isis_tlv_lsp);
2941 tlv_lsp++;
2942 }
2943 break;
2944
2945 case ISIS_TLV_CHECKSUM:
2946 if (tmp < ISIS_TLV_CHECKSUM_MINLEN)
2947 break;
2948 ND_TCHECK2(*tptr, ISIS_TLV_CHECKSUM_MINLEN);
2949 ND_PRINT((ndo, "\n\t checksum: 0x%04x ", EXTRACT_16BITS(tptr)));
2950 /* do not attempt to verify the checksum if it is zero
2951 * most likely a HMAC-MD5 TLV is also present and
2952 * to avoid conflicts the checksum TLV is zeroed.
2953 * see rfc3358 for details
2954 */
2955 osi_print_cksum(ndo, optr, EXTRACT_16BITS(tptr), tptr-optr,
2956 length);
2957 break;
2958
2959 case ISIS_TLV_POI:
2960 if (tlv_len >= SYSTEM_ID_LEN + 1) {
2961 ND_TCHECK2(*tptr, SYSTEM_ID_LEN + 1);
2962 ND_PRINT((ndo, "\n\t Purge Originator System-ID: %s",
2963 isis_print_id(tptr + 1, SYSTEM_ID_LEN)));
2964 }
2965
2966 if (tlv_len == 2 * SYSTEM_ID_LEN + 1) {
2967 ND_TCHECK2(*tptr, 2 * SYSTEM_ID_LEN + 1);
2968 ND_PRINT((ndo, "\n\t Received from System-ID: %s",
2969 isis_print_id(tptr + SYSTEM_ID_LEN + 1, SYSTEM_ID_LEN)));
2970 }
2971 break;
2972
2973 case ISIS_TLV_MT_SUPPORTED:
2974 if (tmp < ISIS_TLV_MT_SUPPORTED_MINLEN)
2975 break;
2976 while (tmp>1) {
2977 /* length can only be a multiple of 2, otherwise there is
2978 something broken -> so decode down until length is 1 */
2979 if (tmp!=1) {
2980 mt_len = isis_print_mtid(ndo, tptr, "\n\t ");
2981 if (mt_len == 0) /* did something go wrong ? */
2982 goto trunctlv;
2983 tptr+=mt_len;
2984 tmp-=mt_len;
2985 } else {
2986 ND_PRINT((ndo, "\n\t invalid MT-ID"));
2987 break;
2988 }
2989 }
2990 break;
2991
2992 case ISIS_TLV_RESTART_SIGNALING:
2993 /* first attempt to decode the flags */
2994 if (tmp < ISIS_TLV_RESTART_SIGNALING_FLAGLEN)
2995 break;
2996 ND_TCHECK2(*tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN);
2997 ND_PRINT((ndo, "\n\t Flags [%s]",
2998 bittok2str(isis_restart_flag_values, "none", *tptr)));
2999 tptr+=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
3000 tmp-=ISIS_TLV_RESTART_SIGNALING_FLAGLEN;
3001
3002 /* is there anything other than the flags field? */
3003 if (tmp == 0)
3004 break;
3005
3006 if (tmp < ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN)
3007 break;
3008 ND_TCHECK2(*tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN);
3009
3010 ND_PRINT((ndo, ", Remaining holding time %us", EXTRACT_16BITS(tptr)));
3011 tptr+=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
3012 tmp-=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN;
3013
3014 /* is there an additional sysid field present ?*/
3015 if (tmp == SYSTEM_ID_LEN) {
3016 ND_TCHECK2(*tptr, SYSTEM_ID_LEN);
3017 ND_PRINT((ndo, ", for %s", isis_print_id(tptr,SYSTEM_ID_LEN)));
3018 }
3019 break;
3020
3021 case ISIS_TLV_IDRP_INFO:
3022 if (tmp < ISIS_TLV_IDRP_INFO_MINLEN)
3023 break;
3024 ND_TCHECK2(*tptr, ISIS_TLV_IDRP_INFO_MINLEN);
3025 ND_PRINT((ndo, "\n\t Inter-Domain Information Type: %s",
3026 tok2str(isis_subtlv_idrp_values,
3027 "Unknown (0x%02x)",
3028 *tptr)));
3029 switch (*tptr++) {
3030 case ISIS_SUBTLV_IDRP_ASN:
3031 ND_TCHECK2(*tptr, 2); /* fetch AS number */
3032 ND_PRINT((ndo, "AS Number: %u", EXTRACT_16BITS(tptr)));
3033 break;
3034 case ISIS_SUBTLV_IDRP_LOCAL:
3035 case ISIS_SUBTLV_IDRP_RES:
3036 default:
3037 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_len - 1))
3038 return(0);
3039 break;
3040 }
3041 break;
3042
3043 case ISIS_TLV_LSP_BUFFERSIZE:
3044 if (tmp < ISIS_TLV_LSP_BUFFERSIZE_MINLEN)
3045 break;
3046 ND_TCHECK2(*tptr, ISIS_TLV_LSP_BUFFERSIZE_MINLEN);
3047 ND_PRINT((ndo, "\n\t LSP Buffersize: %u", EXTRACT_16BITS(tptr)));
3048 break;
3049
3050 case ISIS_TLV_PART_DIS:
3051 while (tmp >= SYSTEM_ID_LEN) {
3052 ND_TCHECK2(*tptr, SYSTEM_ID_LEN);
3053 ND_PRINT((ndo, "\n\t %s", isis_print_id(tptr, SYSTEM_ID_LEN)));
3054 tptr+=SYSTEM_ID_LEN;
3055 tmp-=SYSTEM_ID_LEN;
3056 }
3057 break;
3058
3059 case ISIS_TLV_PREFIX_NEIGH:
3060 if (tmp < sizeof(struct isis_metric_block))
3061 break;
3062 ND_TCHECK2(*tptr, sizeof(struct isis_metric_block));
3063 ND_PRINT((ndo, "\n\t Metric Block"));
3064 isis_print_metric_block(ndo, (const struct isis_metric_block *)tptr);
3065 tptr+=sizeof(struct isis_metric_block);
3066 tmp-=sizeof(struct isis_metric_block);
3067
3068 while(tmp>0) {
3069 ND_TCHECK2(*tptr, 1);
3070 prefix_len=*tptr++; /* read out prefix length in semioctets*/
3071 if (prefix_len < 2) {
3072 ND_PRINT((ndo, "\n\t\tAddress: prefix length %u < 2", prefix_len));
3073 break;
3074 }
3075 tmp--;
3076 if (tmp < prefix_len/2)
3077 break;
3078 ND_TCHECK2(*tptr, prefix_len / 2);
3079 ND_PRINT((ndo, "\n\t\tAddress: %s/%u",
3080 isonsap_string(ndo, tptr, prefix_len / 2), prefix_len * 4));
3081 tptr+=prefix_len/2;
3082 tmp-=prefix_len/2;
3083 }
3084 break;
3085
3086 case ISIS_TLV_IIH_SEQNR:
3087 if (tmp < ISIS_TLV_IIH_SEQNR_MINLEN)
3088 break;
3089 ND_TCHECK2(*tptr, ISIS_TLV_IIH_SEQNR_MINLEN); /* check if four bytes are on the wire */
3090 ND_PRINT((ndo, "\n\t Sequence number: %u", EXTRACT_32BITS(tptr)));
3091 break;
3092
3093 case ISIS_TLV_VENDOR_PRIVATE:
3094 if (tmp < ISIS_TLV_VENDOR_PRIVATE_MINLEN)
3095 break;
3096 ND_TCHECK2(*tptr, ISIS_TLV_VENDOR_PRIVATE_MINLEN); /* check if enough byte for a full oui */
3097 vendor_id = EXTRACT_24BITS(tptr);
3098 ND_PRINT((ndo, "\n\t Vendor: %s (%u)",
3099 tok2str(oui_values, "Unknown", vendor_id),
3100 vendor_id));
3101 tptr+=3;
3102 tmp-=3;
3103 if (tmp > 0) /* hexdump the rest */
3104 if (!print_unknown_data(ndo, tptr, "\n\t\t", tmp))
3105 return(0);
3106 break;
3107 /*
3108 * FIXME those are the defined TLVs that lack a decoder
3109 * you are welcome to contribute code ;-)
3110 */
3111
3112 case ISIS_TLV_DECNET_PHASE4:
3113 case ISIS_TLV_LUCENT_PRIVATE:
3114 case ISIS_TLV_IPAUTH:
3115 case ISIS_TLV_NORTEL_PRIVATE1:
3116 case ISIS_TLV_NORTEL_PRIVATE2:
3117
3118 default:
3119 if (ndo->ndo_vflag <= 1) {
3120 if (!print_unknown_data(ndo, pptr, "\n\t\t", tlv_len))
3121 return(0);
3122 }
3123 break;
3124 }
3125 /* do we want to see an additionally hexdump ? */
3126 if (ndo->ndo_vflag> 1) {
3127 if (!print_unknown_data(ndo, pptr, "\n\t ", tlv_len))
3128 return(0);
3129 }
3130
3131 pptr += tlv_len;
3132 packet_len -= tlv_len;
3133 }
3134
3135 if (packet_len != 0) {
3136 ND_PRINT((ndo, "\n\t %u straggler bytes", packet_len));
3137 }
3138 return (1);
3139
3140 trunc:
3141 ND_PRINT((ndo, "%s", tstr));
3142 return (1);
3143
3144 trunctlv:
3145 ND_PRINT((ndo, "\n\t\t"));
3146 ND_PRINT((ndo, "%s", tstr));
3147 return(1);
3148 }
3149
3150 static void
osi_print_cksum(netdissect_options * ndo,const uint8_t * pptr,uint16_t checksum,int checksum_offset,u_int length)3151 osi_print_cksum(netdissect_options *ndo, const uint8_t *pptr,
3152 uint16_t checksum, int checksum_offset, u_int length)
3153 {
3154 uint16_t calculated_checksum;
3155
3156 /* do not attempt to verify the checksum if it is zero,
3157 * if the offset is nonsense,
3158 * or the base pointer is not sane
3159 */
3160 if (!checksum
3161 || checksum_offset < 0
3162 || !ND_TTEST2(*(pptr + checksum_offset), 2)
3163 || (u_int)checksum_offset > length
3164 || !ND_TTEST2(*pptr, length)) {
3165 ND_PRINT((ndo, " (unverified)"));
3166 } else {
3167 #if 0
3168 printf("\nosi_print_cksum: %p %u %u\n", pptr, checksum_offset, length);
3169 #endif
3170 calculated_checksum = create_osi_cksum(pptr, checksum_offset, length);
3171 if (checksum == calculated_checksum) {
3172 ND_PRINT((ndo, " (correct)"));
3173 } else {
3174 ND_PRINT((ndo, " (incorrect should be 0x%04x)", calculated_checksum));
3175 }
3176 }
3177 }
3178
3179 /*
3180 * Local Variables:
3181 * c-style: whitesmith
3182 * c-basic-offset: 8
3183 * End:
3184 */
3185