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check against min. TLV length / get if logic right
[tcpdump] / print-isoclns.c
1 /*
2 * Copyright (c) 1992, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Original code by Matt Thomas, Digital Equipment Corporation
22 *
23 * Extensively modified by Hannes Gredler (hannes@juniper.net) for more
24 * complete IS-IS support.
25 */
26
27 #ifndef lint
28 static const char rcsid[] _U_ =
29 "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.106.2.8 2005-04-25 10:44:24 hannes Exp $ (LBL)";
30 #endif
31
32 #ifdef HAVE_CONFIG_H
33 #include "config.h"
34 #endif
35
36 #include <tcpdump-stdinc.h>
37
38 #include <stdio.h>
39 #include <string.h>
40
41 #include "interface.h"
42 #include "addrtoname.h"
43 #include "ethertype.h"
44 #include "ether.h"
45 #include "extract.h"
46 #include "gmpls.h"
47
48 #define NLPID_CLNS 129 /* 0x81 */
49 #define NLPID_ESIS 130 /* 0x82 */
50 #define NLPID_ISIS 131 /* 0x83 */
51 #define NLPID_IP6 0x8e
52 #define NLPID_IP 0xcc
53 #define NLPID_NULLNS 0
54
55 #define IPV4 1 /* AFI value */
56 #define IPV6 2 /* AFI value */
57
58 /*
59 * IS-IS is defined in ISO 10589. Look there for protocol definitions.
60 */
61
62 #define SYSTEM_ID_LEN ETHER_ADDR_LEN
63 #define NODE_ID_LEN SYSTEM_ID_LEN+1
64 #define LSP_ID_LEN SYSTEM_ID_LEN+2
65
66 #define ISIS_VERSION 1
67 #define PDU_TYPE_MASK 0x1F
68 #define PRIORITY_MASK 0x7F
69
70 #define L1_LAN_IIH 15
71 #define L2_LAN_IIH 16
72 #define PTP_IIH 17
73 #define L1_LSP 18
74 #define L2_LSP 20
75 #define L1_CSNP 24
76 #define L2_CSNP 25
77 #define L1_PSNP 26
78 #define L2_PSNP 27
79
80 static struct tok isis_pdu_values[] = {
81 { L1_LAN_IIH, "L1 Lan IIH"},
82 { L2_LAN_IIH, "L2 Lan IIH"},
83 { PTP_IIH, "p2p IIH"},
84 { L1_LSP, "L1 LSP"},
85 { L2_LSP, "L2 LSP"},
86 { L1_CSNP, "L1 CSNP"},
87 { L2_CSNP, "L2 CSNP"},
88 { L1_PSNP, "L1 PSNP"},
89 { L2_PSNP, "L2 PSNP"},
90 { 0, NULL}
91 };
92
93 /*
94 * A TLV is a tuple of a type, length and a value and is normally used for
95 * encoding information in all sorts of places. This is an enumeration of
96 * the well known types.
97 *
98 * list taken from rfc3359 plus some memory from veterans ;-)
99 */
100
101 #define TLV_AREA_ADDR 1 /* iso10589 */
102 #define TLV_IS_REACH 2 /* iso10589 */
103 #define TLV_ESNEIGH 3 /* iso10589 */
104 #define TLV_PART_DIS 4 /* iso10589 */
105 #define TLV_PREFIX_NEIGH 5 /* iso10589 */
106 #define TLV_ISNEIGH 6 /* iso10589 */
107 #define TLV_ISNEIGH_VARLEN 7 /* iso10589 */
108 #define TLV_PADDING 8 /* iso10589 */
109 #define TLV_LSP 9 /* iso10589 */
110 #define TLV_AUTH 10 /* iso10589, rfc3567 */
111 #define TLV_CHECKSUM 12 /* rfc3358 */
112 #define TLV_LSP_BUFFERSIZE 14 /* iso10589 rev2 */
113 #define TLV_EXT_IS_REACH 22 /* draft-ietf-isis-traffic-05 */
114 #define TLV_IS_ALIAS_ID 24 /* draft-ietf-isis-ext-lsp-frags-02 */
115 #define TLV_DECNET_PHASE4 42
116 #define TLV_LUCENT_PRIVATE 66
117 #define TLV_INT_IP_REACH 128 /* rfc1195, rfc2966 */
118 #define TLV_PROTOCOLS 129 /* rfc1195 */
119 #define TLV_EXT_IP_REACH 130 /* rfc1195, rfc2966 */
120 #define TLV_IDRP_INFO 131 /* rfc1195 */
121 #define TLV_IPADDR 132 /* rfc1195 */
122 #define TLV_IPAUTH 133 /* rfc1195 */
123 #define TLV_TE_ROUTER_ID 134 /* draft-ietf-isis-traffic-05 */
124 #define TLV_EXTD_IP_REACH 135 /* draft-ietf-isis-traffic-05 */
125 #define TLV_HOSTNAME 137 /* rfc2763 */
126 #define TLV_SHARED_RISK_GROUP 138 /* draft-ietf-isis-gmpls-extensions */
127 #define TLV_NORTEL_PRIVATE1 176
128 #define TLV_NORTEL_PRIVATE2 177
129 #define TLV_HOLDTIME 198 /* ES-IS */
130 #define TLV_RESTART_SIGNALING 211 /* draft-ietf-isis-restart-01 */
131 #define TLV_MT_IS_REACH 222 /* draft-ietf-isis-wg-multi-topology-05 */
132 #define TLV_MT_SUPPORTED 229 /* draft-ietf-isis-wg-multi-topology-05 */
133 #define TLV_IP6ADDR 232 /* draft-ietf-isis-ipv6-02 */
134 #define TLV_MT_IP_REACH 235 /* draft-ietf-isis-wg-multi-topology-05 */
135 #define TLV_IP6_REACH 236 /* draft-ietf-isis-ipv6-02 */
136 #define TLV_MT_IP6_REACH 237 /* draft-ietf-isis-wg-multi-topology-05 */
137 #define TLV_PTP_ADJ 240 /* rfc3373 */
138 #define TLV_IIH_SEQNR 241 /* draft-shen-isis-iih-sequence-00 */
139 #define TLV_VENDOR_PRIVATE 250 /* draft-ietf-isis-proprietary-tlv-00 */
140
141 static struct tok isis_tlv_values[] = {
142 { TLV_AREA_ADDR, "Area address(es)"},
143 { TLV_IS_REACH, "IS Reachability"},
144 { TLV_ESNEIGH, "ES Neighbor(s)"},
145 { TLV_PART_DIS, "Partition DIS"},
146 { TLV_PREFIX_NEIGH, "Prefix Neighbors"},
147 { TLV_ISNEIGH, "IS Neighbor(s)"},
148 { TLV_ISNEIGH_VARLEN, "IS Neighbor(s) (variable length)"},
149 { TLV_PADDING, "Padding"},
150 { TLV_LSP, "LSP entries"},
151 { TLV_AUTH, "Authentication"},
152 { TLV_CHECKSUM, "Checksum"},
153 { TLV_LSP_BUFFERSIZE, "LSP Buffersize"},
154 { TLV_EXT_IS_REACH, "Extended IS Reachability"},
155 { TLV_IS_ALIAS_ID, "IS Alias ID"},
156 { TLV_DECNET_PHASE4, "DECnet Phase IV"},
157 { TLV_LUCENT_PRIVATE, "Lucent Proprietary"},
158 { TLV_INT_IP_REACH, "IPv4 Internal Reachability"},
159 { TLV_PROTOCOLS, "Protocols supported"},
160 { TLV_EXT_IP_REACH, "IPv4 External Reachability"},
161 { TLV_IDRP_INFO, "Inter-Domain Information Type"},
162 { TLV_IPADDR, "IPv4 Interface address(es)"},
163 { TLV_IPAUTH, "IPv4 authentication (deprecated)"},
164 { TLV_TE_ROUTER_ID, "Traffic Engineering Router ID"},
165 { TLV_EXTD_IP_REACH, "Extended IPv4 Reachability"},
166 { TLV_HOSTNAME, "Hostname"},
167 { TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"},
168 { TLV_NORTEL_PRIVATE1, "Nortel Proprietary"},
169 { TLV_NORTEL_PRIVATE2, "Nortel Proprietary"},
170 { TLV_HOLDTIME, "Holdtime"},
171 { TLV_RESTART_SIGNALING, "Restart Signaling"},
172 { TLV_MT_IS_REACH, "Multi Topology IS Reachability"},
173 { TLV_MT_SUPPORTED, "Multi Topology"},
174 { TLV_IP6ADDR, "IPv6 Interface address(es)"},
175 { TLV_MT_IP_REACH, "Multi-Topology IPv4 Reachability"},
176 { TLV_IP6_REACH, "IPv6 reachability"},
177 { TLV_MT_IP6_REACH, "Multi-Topology IP6 Reachability"},
178 { TLV_PTP_ADJ, "Point-to-point Adjacency State"},
179 { TLV_IIH_SEQNR, "Hello PDU Sequence Number"},
180 { TLV_VENDOR_PRIVATE, "Vendor Private"},
181 { 0, NULL }
182 };
183
184 #define SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* draft-ietf-isis-traffic-05 */
185 #define SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* draft-ietf-isis-gmpls-extensions */
186 #define SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* draft-ietf-isis-traffic-05 */
187 #define SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* draft-ietf-isis-traffic-05 */
188 #define SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* draft-ietf-isis-traffic-05 */
189 #define SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* draft-ietf-isis-traffic-05 */
190 #define SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* draft-ietf-isis-traffic-05 */
191 #define SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* draft-ietf-isis-traffic-05 */
192 #define SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* draft-ietf-isis-traffic-05 */
193 #define SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* draft-ietf-isis-gmpls-extensions */
194 #define SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* draft-ietf-isis-gmpls-extensions */
195
196 static struct tok isis_ext_is_reach_subtlv_values[] = {
197 { SUBTLV_EXT_IS_REACH_ADMIN_GROUP, "Administrative groups" },
198 { SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
199 { SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID, "Link Remote Identifier" },
200 { SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR, "IPv4 interface address" },
201 { SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR, "IPv4 neighbor address" },
202 { SUBTLV_EXT_IS_REACH_MAX_LINK_BW, "Maximum link bandwidth" },
203 { SUBTLV_EXT_IS_REACH_RESERVABLE_BW, "Reservable link bandwidth" },
204 { SUBTLV_EXT_IS_REACH_UNRESERVED_BW, "Unreserved bandwidth" },
205 { SUBTLV_EXT_IS_REACH_TE_METRIC, "Traffic Engineering Metric" },
206 { SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE, "Link Protection Type" },
207 { SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR, "Interface Switching Capability" },
208 { 250, "Reserved for cisco specific extensions" },
209 { 251, "Reserved for cisco specific extensions" },
210 { 252, "Reserved for cisco specific extensions" },
211 { 253, "Reserved for cisco specific extensions" },
212 { 254, "Reserved for cisco specific extensions" },
213 { 255, "Reserved for future expansion" },
214 { 0, NULL }
215 };
216
217 #define SUBTLV_EXTD_IP_REACH_ADMIN_TAG32 1
218 #define SUBTLV_EXTD_IP_REACH_ADMIN_TAG64 2
219
220 static struct tok isis_ext_ip_reach_subtlv_values[] = {
221 { SUBTLV_EXTD_IP_REACH_ADMIN_TAG32, "32-Bit Administrative tag" },
222 { SUBTLV_EXTD_IP_REACH_ADMIN_TAG64, "64-Bit Administrative tag" },
223 { 0, NULL }
224 };
225
226 #define SUBTLV_AUTH_SIMPLE 1
227 #define SUBTLV_AUTH_MD5 54
228 #define SUBTLV_AUTH_MD5_LEN 16
229 #define SUBTLV_AUTH_PRIVATE 255
230
231 static struct tok isis_subtlv_auth_values[] = {
232 { SUBTLV_AUTH_SIMPLE, "simple text password"},
233 { SUBTLV_AUTH_MD5, "HMAC-MD5 password"},
234 { SUBTLV_AUTH_PRIVATE, "Routing Domain private password"},
235 { 0, NULL }
236 };
237
238 #define SUBTLV_IDRP_RES 0
239 #define SUBTLV_IDRP_LOCAL 1
240 #define SUBTLV_IDRP_ASN 2
241
242 static struct tok isis_subtlv_idrp_values[] = {
243 { SUBTLV_IDRP_RES, "Reserved"},
244 { SUBTLV_IDRP_LOCAL, "Routing-Domain Specific"},
245 { SUBTLV_IDRP_ASN, "AS Number Tag"},
246 { 0, NULL}
247 };
248
249 #define ISIS_8BIT_MASK(x) ((x)&0xff)
250
251 #define ISIS_MASK_LSP_OL_BIT(x) ((x)&0x4)
252 #define ISIS_MASK_LSP_ISTYPE_BITS(x) ((x)&0x3)
253 #define ISIS_MASK_LSP_PARTITION_BIT(x) ((x)&0x80)
254 #define ISIS_MASK_LSP_ATT_BITS(x) ((x)&0x78)
255 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x) ((x)&0x40)
256 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) ((x)&0x20)
257 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x) ((x)&0x10)
258 #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) ((x)&0x8)
259
260 #define ISIS_MASK_MTID(x) ((x)&0x0fff)
261 #define ISIS_MASK_MTFLAGS(x) ((x)&0xf000)
262
263 static struct tok isis_mt_flag_values[] = {
264 { 0x4000, "sub-TLVs present"},
265 { 0x8000, "ATT bit set"},
266 { 0, NULL}
267 };
268
269 #define ISIS_MASK_TLV_EXTD_IP_UPDOWN(x) ((x)&0x80)
270 #define ISIS_MASK_TLV_EXTD_IP_SUBTLV(x) ((x)&0x40)
271
272 #define ISIS_MASK_TLV_EXTD_IP6_IE(x) ((x)&0x40)
273 #define ISIS_MASK_TLV_EXTD_IP6_SUBTLV(x) ((x)&0x20)
274
275 #define ISIS_LSP_TLV_METRIC_SUPPORTED(x) ((x)&0x80)
276 #define ISIS_LSP_TLV_METRIC_IE(x) ((x)&0x40)
277 #define ISIS_LSP_TLV_METRIC_UPDOWN(x) ((x)&0x80)
278 #define ISIS_LSP_TLV_METRIC_VALUE(x) ((x)&0x3f)
279
280 #define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1)
281
282 static struct tok isis_mt_values[] = {
283 { 0, "IPv4 unicast"},
284 { 1, "In-Band Management"},
285 { 2, "IPv6 unicast"},
286 { 3, "Multicast"},
287 { 4095, "Development, Experimental or Proprietary"},
288 { 0, NULL }
289 };
290
291 static struct tok isis_iih_circuit_type_values[] = {
292 { 1, "Level 1 only"},
293 { 2, "Level 2 only"},
294 { 3, "Level 1, Level 2"},
295 { 0, NULL}
296 };
297
298 #define ISIS_LSP_TYPE_UNUSED0 0
299 #define ISIS_LSP_TYPE_LEVEL_1 1
300 #define ISIS_LSP_TYPE_UNUSED2 2
301 #define ISIS_LSP_TYPE_LEVEL_2 3
302
303 static struct tok isis_lsp_istype_values[] = {
304 { ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"},
305 { ISIS_LSP_TYPE_LEVEL_1, "L1 IS"},
306 { ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"},
307 { ISIS_LSP_TYPE_LEVEL_2, "L1L2 IS"},
308 { 0, NULL }
309 };
310
311 static struct tok osi_nlpid_values[] = {
312 { NLPID_CLNS, "CLNS"},
313 { NLPID_IP, "IPv4"},
314 { NLPID_IP6, "IPv6"},
315 { 0, NULL }
316 };
317
318 /*
319 * Katz's point to point adjacency TLV uses codes to tell us the state of
320 * the remote adjacency. Enumerate them.
321 */
322
323 #define ISIS_PTP_ADJ_UP 0
324 #define ISIS_PTP_ADJ_INIT 1
325 #define ISIS_PTP_ADJ_DOWN 2
326
327
328 static struct tok isis_ptp_adjancey_values[] = {
329 { ISIS_PTP_ADJ_UP, "Up" },
330 { ISIS_PTP_ADJ_INIT, "Initializing" },
331 { ISIS_PTP_ADJ_DOWN, "Down" },
332 { 0, NULL}
333 };
334
335 struct isis_tlv_ptp_adj {
336 u_int8_t adjacency_state;
337 u_int8_t extd_local_circuit_id[4];
338 u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
339 u_int8_t neighbor_extd_local_circuit_id[4];
340 };
341
342 static int osi_cksum(const u_int8_t *, u_int);
343 static void esis_print(const u_int8_t *, u_int);
344 static int isis_print(const u_int8_t *, u_int);
345
346 struct isis_metric_block {
347 u_int8_t metric_default;
348 u_int8_t metric_delay;
349 u_int8_t metric_expense;
350 u_int8_t metric_error;
351 };
352
353 struct isis_tlv_is_reach {
354 struct isis_metric_block isis_metric_block;
355 u_int8_t neighbor_nodeid[NODE_ID_LEN];
356 };
357
358 struct isis_tlv_es_reach {
359 struct isis_metric_block isis_metric_block;
360 u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
361 };
362
363 struct isis_tlv_ip_reach {
364 struct isis_metric_block isis_metric_block;
365 u_int8_t prefix[4];
366 u_int8_t mask[4];
367 };
368
369 static struct tok isis_is_reach_virtual_values[] = {
370 { 0, "IsNotVirtual"},
371 { 1, "IsVirtual"},
372 { 0, NULL }
373 };
374
375 static struct tok isis_restart_flag_values[] = {
376 { 0x1, "Restart Request"},
377 { 0x2, "Restart Acknowledgement"},
378 { 0, NULL }
379 };
380
381 struct isis_common_header {
382 u_int8_t nlpid;
383 u_int8_t fixed_len;
384 u_int8_t version; /* Protocol version */
385 u_int8_t id_length;
386 u_int8_t pdu_type; /* 3 MSbits are reserved */
387 u_int8_t pdu_version; /* Packet format version */
388 u_int8_t reserved;
389 u_int8_t max_area;
390 };
391
392 struct isis_iih_lan_header {
393 u_int8_t circuit_type;
394 u_int8_t source_id[SYSTEM_ID_LEN];
395 u_int8_t holding_time[2];
396 u_int8_t pdu_len[2];
397 u_int8_t priority;
398 u_int8_t lan_id[NODE_ID_LEN];
399 };
400
401 struct isis_iih_ptp_header {
402 u_int8_t circuit_type;
403 u_int8_t source_id[SYSTEM_ID_LEN];
404 u_int8_t holding_time[2];
405 u_int8_t pdu_len[2];
406 u_int8_t circuit_id;
407 };
408
409 struct isis_lsp_header {
410 u_int8_t pdu_len[2];
411 u_int8_t remaining_lifetime[2];
412 u_int8_t lsp_id[LSP_ID_LEN];
413 u_int8_t sequence_number[4];
414 u_int8_t checksum[2];
415 u_int8_t typeblock;
416 };
417
418 struct isis_csnp_header {
419 u_int8_t pdu_len[2];
420 u_int8_t source_id[NODE_ID_LEN];
421 u_int8_t start_lsp_id[LSP_ID_LEN];
422 u_int8_t end_lsp_id[LSP_ID_LEN];
423 };
424
425 struct isis_psnp_header {
426 u_int8_t pdu_len[2];
427 u_int8_t source_id[NODE_ID_LEN];
428 };
429
430 struct isis_tlv_lsp {
431 u_int8_t remaining_lifetime[2];
432 u_int8_t lsp_id[LSP_ID_LEN];
433 u_int8_t sequence_number[4];
434 u_int8_t checksum[2];
435 };
436
437 static char *
438 print_nsap(register const u_int8_t *pptr, register int nsap_length)
439 {
440 int nsap_idx;
441 static char nsap_ascii_output[sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx")];
442 char *junk_buf = nsap_ascii_output;
443
444 if (nsap_length < 1 || nsap_length > 20) {
445 snprintf(nsap_ascii_output, sizeof(nsap_ascii_output),
446 "illegal length");
447 return (nsap_ascii_output);
448 }
449
450 for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
451 if (!TTEST2(*pptr, 1))
452 return (0);
453 snprintf(junk_buf,
454 sizeof(nsap_ascii_output) - (junk_buf - nsap_ascii_output),
455 "%02x", *pptr++);
456 junk_buf += strlen(junk_buf);
457 if (((nsap_idx & 1) == 0) &&
458 (nsap_idx + 1 < nsap_length)) {
459 *junk_buf++ = '.';
460 }
461 }
462 *(junk_buf) = '\0';
463 return (nsap_ascii_output);
464 }
465
466 #define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
467 #define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header))
468 #define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header))
469 #define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header))
470 #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header))
471 #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header))
472
473 void isoclns_print(const u_int8_t *p, u_int length, u_int caplen)
474 {
475 const struct isis_common_header *header;
476
477 header = (const struct isis_common_header *)p;
478
479 printf("%sOSI", caplen < 1 ? "|" : "");
480
481 if (caplen < 1) /* enough bytes on the wire ? */
482 return;
483
484 switch (*p) {
485
486 case NLPID_CLNS:
487 (void)printf(", CLNS, length %u", length);
488 break;
489
490 case NLPID_ESIS:
491 esis_print(p, length);
492 return;
493
494 case NLPID_ISIS:
495 if (!isis_print(p, length))
496 print_unknown_data(p,"\n\t",caplen);
497 break;
498
499 case NLPID_NULLNS:
500 (void)printf(", ISO NULLNS, length: %u", length);
501 break;
502
503 default:
504 (void)printf(", Unknown NLPID 0x%02x, length: %u", p[0], length);
505 if (caplen > 1)
506 print_unknown_data(p,"\n\t",caplen);
507 break;
508 }
509 }
510
511 #define ESIS_REDIRECT 6
512 #define ESIS_ESH 2
513 #define ESIS_ISH 4
514
515 static struct tok esis_values[] = {
516 { ESIS_REDIRECT, "redirect"},
517 { ESIS_ESH, "ESH"},
518 { ESIS_ISH, "ISH"},
519 { 0, NULL }
520 };
521
522 struct esis_hdr {
523 u_int8_t version;
524 u_int8_t reserved;
525 u_int8_t type;
526 u_int8_t tmo[2];
527 u_int8_t cksum[2];
528 };
529
530 static void
531 esis_print(const u_int8_t *p, u_int length)
532 {
533 const u_int8_t *ep;
534 u_int li;
535 const struct esis_hdr *eh;
536
537 if (length <= 2) {
538 if (qflag)
539 printf(" bad pkt!");
540 else
541 printf(" no header at all!");
542 return;
543 }
544 li = p[1];
545 eh = (const struct esis_hdr *) &p[2];
546 ep = p + li;
547 if (li > length) {
548 if (qflag)
549 printf(" bad pkt!");
550 else
551 printf(" LI(%d) > PDU size (%d)!", li, length);
552 return;
553 }
554 if (li < sizeof(struct esis_hdr) + 2) {
555 if (qflag)
556 printf(" bad pkt!");
557 else {
558 printf(" too short for esis header %d:", li);
559 while (--length != 0)
560 printf("%02X", *p++);
561 }
562 return;
563 }
564
565 printf(", ES-IS, %s, length %u",
566 tok2str(esis_values,"unknown type: %u",eh->type & 0x1f),
567 length);
568
569 if(vflag < 1)
570 return;
571
572 if (vflag && osi_cksum(p, li)) {
573 printf(" bad cksum (got 0x%02x%02x)",
574 eh->cksum[1], eh->cksum[0]);
575 default_print(p, length);
576 return;
577 }
578 if (eh->version != 1) {
579 printf(" unsupported version %d", eh->version);
580 return;
581 }
582 p += sizeof(*eh) + 2;
583 li -= sizeof(*eh) + 2; /* protoid * li */
584
585 switch (eh->type & 0x1f) {
586 case ESIS_REDIRECT: {
587 const u_int8_t *dst, *snpa, *is;
588
589 dst = p; p += *p + 1;
590 if (p > snapend)
591 return;
592 printf("\n\t\t %s", isonsap_string(dst));
593 snpa = p; p += *p + 1;
594 is = p; p += *p + 1;
595 if (p > snapend)
596 return;
597 if (p > ep) {
598 printf(" [bad li]");
599 return;
600 }
601 if (is[0] == 0)
602 printf(" > %s", etheraddr_string(&snpa[1]));
603 else
604 printf(" > %s", isonsap_string(is));
605 li = ep - p;
606 break;
607 }
608
609 case ESIS_ESH:
610 break;
611
612 case ESIS_ISH: {
613 const u_int8_t *is;
614
615 is = p; p += *p + 1;
616 if (p > ep) {
617 printf(" [bad li]");
618 return;
619 }
620 if (p > snapend)
621 return;
622 if (!qflag)
623 printf("\n\tNET: %s", print_nsap(is+1,*is));
624 li = ep - p;
625 break;
626 }
627
628 default:
629 if (vflag <= 1) {
630 if (p < snapend)
631 print_unknown_data(p,"\n\t ",snapend-p);
632 }
633 return;
634 }
635
636 /* hexdump - FIXME ? */
637 if (vflag > 1) {
638 if (p < snapend)
639 print_unknown_data(p,"\n\t ",snapend-p);
640 }
641 if (vflag)
642 while (p < ep && li) {
643 u_int op, opli;
644 const u_int8_t *q;
645
646 if (snapend - p < 2)
647 return;
648 if (li < 2) {
649 printf(", bad opts/li");
650 return;
651 }
652 op = *p++;
653 opli = *p++;
654 li -= 2;
655 if (opli > li) {
656 printf(", opt (%d) too long", op);
657 return;
658 }
659 li -= opli;
660 q = p;
661 p += opli;
662
663 if (snapend < p)
664 return;
665
666 if (op == TLV_HOLDTIME && opli == 2) {
667 printf("\n\tholdtime: %us", EXTRACT_16BITS(q));
668 continue;
669 }
670
671 if (op == TLV_PROTOCOLS && opli >= 1) {
672 printf("\n\t%s (length: %u): %s",
673 tok2str(isis_tlv_values, "unknown", op),
674 opli,
675 tok2str(osi_nlpid_values,"Unknown 0x%02x",*q));
676 continue;
677 }
678
679 print_unknown_data(q,"\n\t ",opli);
680 }
681 }
682
683 /* shared routine for printing system, node and lsp-ids */
684 static char *
685 isis_print_id(const u_int8_t *cp, int id_len)
686 {
687 int i;
688 static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")];
689 char *pos = id;
690
691 for (i = 1; i <= SYSTEM_ID_LEN; i++) {
692 snprintf(pos, sizeof(id) - (pos - id), "%02x", *cp++);
693 pos += strlen(pos);
694 if (i == 2 || i == 4)
695 *pos++ = '.';
696 }
697 if (id_len >= NODE_ID_LEN) {
698 snprintf(pos, sizeof(id) - (pos - id), ".%02x", *cp++);
699 pos += strlen(pos);
700 }
701 if (id_len == LSP_ID_LEN)
702 snprintf(pos, sizeof(id) - (pos - id), "-%02x", *cp);
703 return (id);
704 }
705
706 /* print the 4-byte metric block which is common found in the old-style TLVs */
707 static int
708 isis_print_metric_block (const struct isis_metric_block *isis_metric_block)
709 {
710 printf(", Default Metric: %d, %s",
711 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default),
712 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal");
713 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay))
714 printf("\n\t\t Delay Metric: %d, %s",
715 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay),
716 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal");
717 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense))
718 printf("\n\t\t Expense Metric: %d, %s",
719 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense),
720 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal");
721 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error))
722 printf("\n\t\t Error Metric: %d, %s",
723 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error),
724 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal");
725
726 return(1); /* everything is ok */
727 }
728
729 static int
730 isis_print_tlv_ip_reach (const u_int8_t *cp, const char *ident, int length)
731 {
732 int prefix_len;
733 const struct isis_tlv_ip_reach *tlv_ip_reach;
734
735 tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp;
736
737 while (length > 0) {
738 if ((size_t)length < sizeof(*tlv_ip_reach)) {
739 printf("short IPv4 Reachability (%d vs %lu)",
740 length,
741 (unsigned long)sizeof(*tlv_ip_reach));
742 return (0);
743 }
744
745 if (!TTEST(*tlv_ip_reach))
746 return (0);
747
748 prefix_len = mask2plen(EXTRACT_32BITS(tlv_ip_reach->mask));
749
750 if (prefix_len == -1)
751 printf("%sIPv4 prefix: %s mask %s",
752 ident,
753 ipaddr_string((tlv_ip_reach->prefix)),
754 ipaddr_string((tlv_ip_reach->mask)));
755 else
756 printf("%sIPv4 prefix: %15s/%u",
757 ident,
758 ipaddr_string((tlv_ip_reach->prefix)),
759 prefix_len);
760
761 printf(", Distribution: %s, Metric: %u, %s",
762 ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up",
763 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default),
764 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal");
765
766 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay))
767 printf("%s Delay Metric: %u, %s",
768 ident,
769 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay),
770 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal");
771
772 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense))
773 printf("%s Expense Metric: %u, %s",
774 ident,
775 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense),
776 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal");
777
778 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error))
779 printf("%s Error Metric: %u, %s",
780 ident,
781 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error),
782 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal");
783
784 length -= sizeof(struct isis_tlv_ip_reach);
785 tlv_ip_reach++;
786 }
787 return (1);
788 }
789
790 /*
791 * this is the common IP-REACH subTLV decoder it is called
792 * from various EXTD-IP REACH TLVs (135,235,236,237)
793 */
794
795 static int
796 isis_print_ip_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) {
797
798 /* first lets see if we know the subTLVs name*/
799 printf("%s%s subTLV #%u, length: %u",
800 ident,
801 tok2str(isis_ext_ip_reach_subtlv_values,
802 "unknown",
803 subt),
804 subt,
805 subl);
806
807 if (!TTEST2(*tptr,subl))
808 goto trunctlv;
809
810 switch(subt) {
811 case SUBTLV_EXTD_IP_REACH_ADMIN_TAG32:
812 while (subl >= 4) {
813 printf(", 0x%08x (=%u)",
814 EXTRACT_32BITS(tptr),
815 EXTRACT_32BITS(tptr));
816 tptr+=4;
817 subl-=4;
818 }
819 break;
820 case SUBTLV_EXTD_IP_REACH_ADMIN_TAG64:
821 while (subl >= 8) {
822 printf(", 0x%08x%08x",
823 EXTRACT_32BITS(tptr),
824 EXTRACT_32BITS(tptr+4));
825 tptr+=8;
826 subl-=8;
827 }
828 break;
829 default:
830 if(!print_unknown_data(tptr,"\n\t\t ",
831 subl))
832 return(0);
833 break;
834 }
835 return(1);
836
837 trunctlv:
838 printf("%spacket exceeded snapshot",ident);
839 return(0);
840 }
841
842 /*
843 * this is the common IS-REACH subTLV decoder it is called
844 * from isis_print_ext_is_reach()
845 */
846
847 static int
848 isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) {
849
850 int priority_level;
851 union { /* int to float conversion buffer for several subTLVs */
852 float f;
853 u_int32_t i;
854 } bw;
855
856 /* first lets see if we know the subTLVs name*/
857 printf("%s%s subTLV #%u, length: %u",
858 ident,
859 tok2str(isis_ext_is_reach_subtlv_values,
860 "unknown",
861 subt),
862 subt,
863 subl);
864
865 if (!TTEST2(*tptr,subl))
866 goto trunctlv;
867
868 switch(subt) {
869 case SUBTLV_EXT_IS_REACH_ADMIN_GROUP:
870 case SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID:
871 case SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
872 if (subl >= 4) {
873 printf(", 0x%08x", EXTRACT_32BITS(tptr));
874 if (subl == 8) /* draft-ietf-isis-gmpls-extensions */
875 printf(", 0x%08x", EXTRACT_32BITS(tptr+4));
876 }
877 break;
878 case SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
879 case SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
880 if (subl >= 4)
881 printf(", %s", ipaddr_string(tptr));
882 break;
883 case SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
884 case SUBTLV_EXT_IS_REACH_RESERVABLE_BW:
885 if (subl >= 4) {
886 bw.i = EXTRACT_32BITS(tptr);
887 printf(", %.3f Mbps", bw.f*8/1000000 );
888 }
889 break;
890 case SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
891 if (subl >= 32) {
892 for (priority_level = 0; priority_level < 8; priority_level++) {
893 bw.i = EXTRACT_32BITS(tptr);
894 printf("%s priority level %d: %.3f Mbps",
895 ident,
896 priority_level,
897 bw.f*8/1000000 );
898 tptr+=4;
899 }
900 }
901 break;
902 case SUBTLV_EXT_IS_REACH_TE_METRIC:
903 if (subl >= 3)
904 printf(", %u", EXTRACT_24BITS(tptr));
905 break;
906 case SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
907 if (subl >= 2) {
908 printf(", %s, Priority %u",
909 bittok2str(gmpls_link_prot_values, "none", *tptr),
910 *(tptr+1));
911 }
912 break;
913 case SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
914 if (subl >= 36) {
915 printf("%s Interface Switching Capability:%s",
916 ident,
917 tok2str(gmpls_switch_cap_values, "Unknown", *(tptr)));
918 printf(", LSP Encoding: %s",
919 tok2str(gmpls_encoding_values, "Unknown", *(tptr+1)));
920 tptr+=4;
921 printf("%s Max LSP Bandwidth:",ident);
922 for (priority_level = 0; priority_level < 8; priority_level++) {
923 bw.i = EXTRACT_32BITS(tptr);
924 printf("%s priority level %d: %.3f Mbps",
925 ident,
926 priority_level,
927 bw.f*8/1000000 );
928 tptr+=4;
929 }
930 subl-=36;
931 /* there is some optional stuff left to decode but this is as of yet
932 not specified so just lets hexdump what is left */
933 if(subl>0){
934 if(!print_unknown_data(tptr,"\n\t\t ",
935 subl-36))
936 return(0);
937 }
938 }
939 break;
940 default:
941 if(!print_unknown_data(tptr,"\n\t\t ",
942 subl))
943 return(0);
944 break;
945 }
946 return(1);
947
948 trunctlv:
949 printf("%spacket exceeded snapshot",ident);
950 return(0);
951 }
952
953
954 /*
955 * this is the common IS-REACH decoder it is called
956 * from various EXTD-IS REACH style TLVs (22,24,222)
957 */
958
959 static int
960 isis_print_ext_is_reach (const u_int8_t *tptr,const char *ident, int tlv_type) {
961
962 char ident_buffer[20];
963 int subtlv_type,subtlv_len,subtlv_sum_len;
964 int proc_bytes = 0; /* how many bytes did we process ? */
965
966 if (!TTEST2(*tptr, NODE_ID_LEN))
967 return(0);
968
969 printf("%sIS Neighbor: %s", ident, isis_print_id(tptr, NODE_ID_LEN));
970 tptr+=(NODE_ID_LEN);
971
972 if (tlv_type != TLV_IS_ALIAS_ID) { /* the Alias TLV Metric field is implicit 0 */
973 if (!TTEST2(*tptr, 3)) /* and is therefore skipped */
974 return(0);
975 printf(", Metric: %d",EXTRACT_24BITS(tptr));
976 tptr+=3;
977 }
978
979 if (!TTEST2(*tptr, 1))
980 return(0);
981 subtlv_sum_len=*(tptr++); /* read out subTLV length */
982 proc_bytes=NODE_ID_LEN+3+1;
983 printf(", %ssub-TLVs present",subtlv_sum_len ? "" : "no ");
984 if (subtlv_sum_len) {
985 printf(" (%u)",subtlv_sum_len);
986 while (subtlv_sum_len>0) {
987 if (!TTEST2(*tptr,2))
988 return(0);
989 subtlv_type=*(tptr++);
990 subtlv_len=*(tptr++);
991 /* prepend the ident string */
992 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident);
993 if(!isis_print_is_reach_subtlv(tptr,subtlv_type,subtlv_len,ident_buffer))
994 return(0);
995 tptr+=subtlv_len;
996 subtlv_sum_len-=(subtlv_len+2);
997 proc_bytes+=(subtlv_len+2);
998 }
999 }
1000 return(proc_bytes);
1001 }
1002
1003 /*
1004 * this is the common Multi Topology ID decoder
1005 * it is called from various MT-TLVs (222,229,235,237)
1006 */
1007
1008 static int
1009 isis_print_mtid (const u_int8_t *tptr,const char *ident) {
1010
1011 if (!TTEST2(*tptr, 2))
1012 return(0);
1013
1014 printf("%s%s",
1015 ident,
1016 tok2str(isis_mt_values,
1017 "Reserved for IETF Consensus",
1018 ISIS_MASK_MTID(EXTRACT_16BITS(tptr))));
1019
1020 printf(" Topology (0x%03x), Flags: [%s]",
1021 ISIS_MASK_MTID(EXTRACT_16BITS(tptr)),
1022 bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(EXTRACT_16BITS(tptr))));
1023
1024 return(2);
1025 }
1026
1027 /*
1028 * this is the common extended IP reach decoder
1029 * it is called from TLVs (135,235,236,237)
1030 * we process the TLV and optional subTLVs and return
1031 * the amount of processed bytes
1032 */
1033
1034 static int
1035 isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi) {
1036
1037 char ident_buffer[20];
1038 u_int8_t prefix[16]; /* shared copy buffer for IPv4 and IPv6 prefixes */
1039 u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen;
1040
1041 if (!TTEST2(*tptr, 4))
1042 return (0);
1043 metric = EXTRACT_32BITS(tptr);
1044 processed=4;
1045 tptr+=4;
1046
1047 if (afi == IPV4) {
1048 if (!TTEST2(*tptr, 1)) /* fetch status byte */
1049 return (0);
1050 status_byte=*(tptr++);
1051 bit_length = status_byte&0x3f;
1052 processed++;
1053 #ifdef INET6
1054 } else if (afi == IPV6) {
1055 if (!TTEST2(*tptr, 1)) /* fetch status & prefix_len byte */
1056 return (0);
1057 status_byte=*(tptr++);
1058 bit_length=*(tptr++);
1059 processed+=2;
1060 #endif
1061 } else
1062 return (0); /* somebody is fooling us */
1063
1064 byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
1065
1066 if (!TTEST2(*tptr, byte_length))
1067 return (0);
1068 memset(prefix, 0, 16); /* clear the copy buffer */
1069 memcpy(prefix,tptr,byte_length); /* copy as much as is stored in the TLV */
1070 tptr+=byte_length;
1071 processed+=byte_length;
1072
1073 if (afi == IPV4)
1074 printf("%sIPv4 prefix: %15s/%u",
1075 ident,
1076 ipaddr_string(prefix),
1077 bit_length);
1078 #ifdef INET6
1079 if (afi == IPV6)
1080 printf("%sIPv6 prefix: %s/%u",
1081 ident,
1082 ip6addr_string(prefix),
1083 bit_length);
1084 #endif
1085
1086 printf(", Distribution: %s, Metric: %u",
1087 ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up",
1088 metric);
1089
1090 if (afi == IPV4 && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte))
1091 printf(", sub-TLVs present");
1092 #ifdef INET6
1093 if (afi == IPV6)
1094 printf(", %s%s",
1095 ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal",
1096 ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : "");
1097 #endif
1098
1099 if ((ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte) && afi == IPV4) ||
1100 (ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) && afi == IPV6)) {
1101 /* assume that one prefix can hold more
1102 than one subTLV - therefore the first byte must reflect
1103 the aggregate bytecount of the subTLVs for this prefix
1104 */
1105 if (!TTEST2(*tptr, 1))
1106 return (0);
1107 sublen=*(tptr++);
1108 processed+=sublen+1;
1109 printf(" (%u)",sublen); /* print out subTLV length */
1110
1111 while (sublen>0) {
1112 if (!TTEST2(*tptr,2))
1113 return (0);
1114 subtlvtype=*(tptr++);
1115 subtlvlen=*(tptr++);
1116 /* prepend the ident string */
1117 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident);
1118 if(!isis_print_ip_reach_subtlv(tptr,subtlvtype,subtlvlen,ident_buffer))
1119 return(0);
1120 tptr+=subtlvlen;
1121 sublen-=(subtlvlen+2);
1122 }
1123 }
1124 return (processed);
1125 }
1126
1127 /*
1128 * isis_print
1129 * Decode IS-IS packets. Return 0 on error.
1130 */
1131
1132 static int isis_print (const u_int8_t *p, u_int length)
1133 {
1134 const struct isis_common_header *header;
1135
1136 const struct isis_iih_lan_header *header_iih_lan;
1137 const struct isis_iih_ptp_header *header_iih_ptp;
1138 const struct isis_lsp_header *header_lsp;
1139 const struct isis_csnp_header *header_csnp;
1140 const struct isis_psnp_header *header_psnp;
1141
1142 const struct isis_tlv_lsp *tlv_lsp;
1143 const struct isis_tlv_ptp_adj *tlv_ptp_adj;
1144 const struct isis_tlv_is_reach *tlv_is_reach;
1145 const struct isis_tlv_es_reach *tlv_es_reach;
1146
1147 u_int8_t pdu_type, max_area, id_length, tlv_type, tlv_len, tmp, alen, lan_alen, prefix_len;
1148 u_int8_t ext_is_len, ext_ip_len, mt_len;
1149 const u_int8_t *optr, *pptr, *tptr;
1150 u_short packet_len,pdu_len;
1151 u_int i;
1152
1153 packet_len=length;
1154 optr = p; /* initialize the _o_riginal pointer to the packet start -
1155 need it for parsing the checksum TLV */
1156 header = (const struct isis_common_header *)p;
1157 TCHECK(*header);
1158 pptr = p+(ISIS_COMMON_HEADER_SIZE);
1159 header_iih_lan = (const struct isis_iih_lan_header *)pptr;
1160 header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
1161 header_lsp = (const struct isis_lsp_header *)pptr;
1162 header_csnp = (const struct isis_csnp_header *)pptr;
1163 header_psnp = (const struct isis_psnp_header *)pptr;
1164
1165 /*
1166 * Sanity checking of the header.
1167 */
1168
1169 if (header->version != ISIS_VERSION) {
1170 printf(", version %d packet not supported", header->version);
1171 return (0);
1172 }
1173
1174 if ((header->id_length != SYSTEM_ID_LEN) && (header->id_length != 0)) {
1175 printf(", system ID length of %d is not supported",
1176 header->id_length);
1177 return (0);
1178 }
1179
1180 if (header->pdu_version != ISIS_VERSION) {
1181 printf(", version %d packet not supported", header->pdu_version);
1182 return (0);
1183 }
1184
1185 max_area = header->max_area;
1186 switch(max_area) {
1187 case 0:
1188 max_area = 3; /* silly shit */
1189 break;
1190 case 255:
1191 printf(", bad packet -- 255 areas");
1192 return (0);
1193 default:
1194 break;
1195 }
1196
1197 id_length = header->id_length;
1198 switch(id_length) {
1199 case 0:
1200 id_length = 6; /* silly shit again */
1201 break;
1202 case 1: /* 1-8 are valid sys-ID lenghts */
1203 case 2:
1204 case 3:
1205 case 4:
1206 case 5:
1207 case 6:
1208 case 7:
1209 case 8:
1210 break;
1211 case 255:
1212 id_length = 0; /* entirely useless */
1213 break;
1214 default:
1215 break;
1216 }
1217
1218 /* toss any non 6-byte sys-ID len PDUs */
1219 if (id_length != 6 ) {
1220 printf(", bad packet -- illegal sys-ID length (%u)", id_length);
1221 return (0);
1222 }
1223
1224 pdu_type=header->pdu_type;
1225
1226 /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/
1227 if (vflag < 1) {
1228 printf(", IS-IS, %s",
1229 tok2str(isis_pdu_values,"unknown PDU-Type %u",pdu_type));
1230
1231 switch (pdu_type) {
1232
1233 case L1_LAN_IIH:
1234 case L2_LAN_IIH:
1235 printf(", src-id %s",
1236 isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN));
1237 printf(", lan-id %s, prio %u",
1238 isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN),
1239 header_iih_lan->priority);
1240 break;
1241 case PTP_IIH:
1242 printf(", src-id %s", isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN));
1243 break;
1244 case L1_LSP:
1245 case L2_LSP:
1246 printf(", lsp-id %s, seq 0x%08x, lifetime %5us",
1247 isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
1248 EXTRACT_32BITS(header_lsp->sequence_number),
1249 EXTRACT_16BITS(header_lsp->remaining_lifetime));
1250 break;
1251 case L1_CSNP:
1252 case L2_CSNP:
1253 printf(", src-id %s", isis_print_id(header_csnp->source_id,NODE_ID_LEN));
1254 break;
1255 case L1_PSNP:
1256 case L2_PSNP:
1257 printf(", src-id %s", isis_print_id(header_psnp->source_id,NODE_ID_LEN));
1258 break;
1259
1260 }
1261 printf(", length %u", length);
1262
1263 return(1);
1264 }
1265
1266 /* ok they seem to want to know everything - lets fully decode it */
1267 printf(", IS-IS, length: %u",length);
1268
1269 printf("\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)",
1270 tok2str(isis_pdu_values,
1271 "unknown, type %u",
1272 pdu_type),
1273 header->fixed_len,
1274 header->version,
1275 header->pdu_version,
1276 id_length,
1277 header->id_length,
1278 max_area,
1279 header->max_area);
1280
1281 if (vflag > 1) {
1282 if(!print_unknown_data(optr,"\n\t",8)) /* provide the _o_riginal pointer */
1283 return(0); /* for optionally debugging the common header */
1284 }
1285
1286 switch (pdu_type) {
1287
1288 case L1_LAN_IIH:
1289 case L2_LAN_IIH:
1290 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) {
1291 printf(", bogus fixed header length %u should be %lu",
1292 header->fixed_len, (unsigned long)ISIS_IIH_LAN_HEADER_SIZE);
1293 return (0);
1294 }
1295
1296 pdu_len=EXTRACT_16BITS(header_iih_lan->pdu_len);
1297 if (packet_len>pdu_len) {
1298 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1299 length=pdu_len;
1300 }
1301
1302 TCHECK(*header_iih_lan);
1303 printf("\n\t source-id: %s, holding time: %us, Flags: [%s]",
1304 isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN),
1305 EXTRACT_16BITS(header_iih_lan->holding_time),
1306 tok2str(isis_iih_circuit_type_values,
1307 "unknown circuit type 0x%02x",
1308 header_iih_lan->circuit_type));
1309
1310 printf("\n\t lan-id: %s, Priority: %u, PDU length: %u",
1311 isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN),
1312 (header_iih_lan->priority) & PRIORITY_MASK,
1313 pdu_len);
1314
1315 if (vflag > 1) {
1316 if(!print_unknown_data(pptr,"\n\t ",ISIS_IIH_LAN_HEADER_SIZE))
1317 return(0);
1318 }
1319
1320 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
1321 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
1322 break;
1323
1324 case PTP_IIH:
1325 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) {
1326 printf(", bogus fixed header length %u should be %lu",
1327 header->fixed_len, (unsigned long)ISIS_IIH_PTP_HEADER_SIZE);
1328 return (0);
1329 }
1330
1331 pdu_len=EXTRACT_16BITS(header_iih_ptp->pdu_len);
1332 if (packet_len>pdu_len) {
1333 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1334 length=pdu_len;
1335 }
1336
1337 TCHECK(*header_iih_ptp);
1338 printf("\n\t source-id: %s, holding time: %us, Flags: [%s]",
1339 isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN),
1340 EXTRACT_16BITS(header_iih_ptp->holding_time),
1341 tok2str(isis_iih_circuit_type_values,
1342 "unknown circuit type 0x%02x",
1343 header_iih_ptp->circuit_type));
1344
1345 printf("\n\t circuit-id: 0x%02x, PDU length: %u",
1346 header_iih_ptp->circuit_id,
1347 pdu_len);
1348
1349 if (vflag > 1) {
1350 if(!print_unknown_data(pptr,"\n\t ",ISIS_IIH_PTP_HEADER_SIZE))
1351 return(0);
1352 }
1353
1354 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
1355 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
1356 break;
1357
1358 case L1_LSP:
1359 case L2_LSP:
1360 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) {
1361 printf(", bogus fixed header length %u should be %lu",
1362 header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE);
1363 return (0);
1364 }
1365
1366 pdu_len=EXTRACT_16BITS(header_lsp->pdu_len);
1367 if (packet_len>pdu_len) {
1368 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1369 length=pdu_len;
1370 }
1371
1372 TCHECK(*header_lsp);
1373 printf("\n\t lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t chksum: 0x%04x",
1374 isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
1375 EXTRACT_32BITS(header_lsp->sequence_number),
1376 EXTRACT_16BITS(header_lsp->remaining_lifetime),
1377 EXTRACT_16BITS(header_lsp->checksum));
1378
1379 /* if this is a purge do not attempt to verify the checksum */
1380 if ( EXTRACT_16BITS(header_lsp->remaining_lifetime) == 0 &&
1381 EXTRACT_16BITS(header_lsp->checksum) == 0)
1382 printf(" (purged)");
1383 else
1384 /* verify the checksum -
1385 * checking starts at the lsp-id field at byte position [12]
1386 * hence the length needs to be reduced by 12 bytes */
1387 printf(" (%s)", (osi_cksum((u_int8_t *)header_lsp->lsp_id, length-12)) ? "incorrect" : "correct");
1388
1389 printf(", PDU length: %u, Flags: [ %s",
1390 pdu_len,
1391 ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : "");
1392
1393 if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) {
1394 printf("%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : "");
1395 printf("%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : "");
1396 printf("%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : "");
1397 printf("%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : "");
1398 printf("ATT bit set, ");
1399 }
1400 printf("%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : "");
1401 printf("%s ]", tok2str(isis_lsp_istype_values,"Unknown(0x%x)",ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)));
1402
1403 if (vflag > 1) {
1404 if(!print_unknown_data(pptr,"\n\t ",ISIS_LSP_HEADER_SIZE))
1405 return(0);
1406 }
1407
1408 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
1409 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
1410 break;
1411
1412 case L1_CSNP:
1413 case L2_CSNP:
1414 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) {
1415 printf(", bogus fixed header length %u should be %lu",
1416 header->fixed_len, (unsigned long)ISIS_CSNP_HEADER_SIZE);
1417 return (0);
1418 }
1419
1420 pdu_len=EXTRACT_16BITS(header_csnp->pdu_len);
1421 if (packet_len>pdu_len) {
1422 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1423 length=pdu_len;
1424 }
1425
1426 TCHECK(*header_csnp);
1427 printf("\n\t source-id: %s, PDU length: %u",
1428 isis_print_id(header_csnp->source_id, NODE_ID_LEN),
1429 pdu_len);
1430 printf("\n\t start lsp-id: %s",
1431 isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN));
1432 printf("\n\t end lsp-id: %s",
1433 isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN));
1434
1435 if (vflag > 1) {
1436 if(!print_unknown_data(pptr,"\n\t ",ISIS_CSNP_HEADER_SIZE))
1437 return(0);
1438 }
1439
1440 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
1441 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
1442 break;
1443
1444 case L1_PSNP:
1445 case L2_PSNP:
1446 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) {
1447 printf("- bogus fixed header length %u should be %lu",
1448 header->fixed_len, (unsigned long)ISIS_PSNP_HEADER_SIZE);
1449 return (0);
1450 }
1451
1452 pdu_len=EXTRACT_16BITS(header_psnp->pdu_len);
1453 if (packet_len>pdu_len) {
1454 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1455 length=pdu_len;
1456 }
1457
1458 TCHECK(*header_psnp);
1459 printf("\n\t source-id: %s, PDU length: %u",
1460 isis_print_id(header_psnp->source_id, NODE_ID_LEN),
1461 pdu_len);
1462
1463 if (vflag > 1) {
1464 if(!print_unknown_data(pptr,"\n\t ",ISIS_PSNP_HEADER_SIZE))
1465 return(0);
1466 }
1467
1468 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
1469 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
1470 break;
1471
1472 default:
1473 if(!print_unknown_data(pptr,"\n\t ",length))
1474 return(0);
1475 return (0);
1476 }
1477
1478 /*
1479 * Now print the TLV's.
1480 */
1481
1482 while (packet_len >= 2) {
1483 if (pptr == snapend) {
1484 return (1);
1485 }
1486
1487 if (!TTEST2(*pptr, 2)) {
1488 printf("\n\t\t packet exceeded snapshot (%ld) bytes",
1489 (long)(pptr-snapend));
1490 return (1);
1491 }
1492 tlv_type = *pptr++;
1493 tlv_len = *pptr++;
1494 tmp =tlv_len; /* copy temporary len & pointer to packet data */
1495 tptr = pptr;
1496 packet_len -= 2;
1497 if (tlv_len > packet_len) {
1498 break;
1499 }
1500
1501 /* first lets see if we know the TLVs name*/
1502 printf("\n\t %s TLV #%u, length: %u",
1503 tok2str(isis_tlv_values,
1504 "unknown",
1505 tlv_type),
1506 tlv_type,
1507 tlv_len);
1508
1509 if (tlv_len == 0) /* something is malformed */
1510 break;
1511
1512 /* now check if we have a decoder otherwise do a hexdump at the end*/
1513 switch (tlv_type) {
1514 case TLV_AREA_ADDR:
1515 if (!TTEST2(*tptr, 1))
1516 goto trunctlv;
1517 alen = *tptr++;
1518 while (tmp && alen < tmp) {
1519 printf("\n\t Area address (length: %u): %s",
1520 alen,
1521 print_nsap(tptr, alen));
1522 tptr += alen;
1523 tmp -= alen + 1;
1524 if (tmp==0) /* if this is the last area address do not attemt a boundary check */
1525 break;
1526 if (!TTEST2(*tptr, 1))
1527 goto trunctlv;
1528 alen = *tptr++;
1529 }
1530 break;
1531 case TLV_ISNEIGH:
1532 while (tmp >= ETHER_ADDR_LEN) {
1533 if (!TTEST2(*tptr, ETHER_ADDR_LEN))
1534 goto trunctlv;
1535 printf("\n\t SNPA: %s",isis_print_id(tptr,ETHER_ADDR_LEN));
1536 tmp -= ETHER_ADDR_LEN;
1537 tptr += ETHER_ADDR_LEN;
1538 }
1539 break;
1540
1541 case TLV_ISNEIGH_VARLEN:
1542 if (!TTEST2(*tptr, 1) || tmp < 3) /* min. TLV length */
1543 goto trunctlv;
1544 lan_alen = *tptr++; /* LAN adress length */
1545 tmp --;
1546 printf("\n\t LAN address length %u bytes ",lan_alen);
1547 while (tmp >= lan_alen) {
1548 if (!TTEST2(*tptr, lan_alen))
1549 goto trunctlv;
1550 printf("\n\t\tIS Neighbor: %s",isis_print_id(tptr,lan_alen));
1551 tmp -= lan_alen;
1552 tptr +=lan_alen;
1553 }
1554 break;
1555
1556 case TLV_PADDING:
1557 break;
1558
1559 case TLV_MT_IS_REACH:
1560 while (tmp >= 2+NODE_ID_LEN+3+1) {
1561 mt_len = isis_print_mtid(tptr, "\n\t ");
1562 if (mt_len == 0) /* did something go wrong ? */
1563 goto trunctlv;
1564 tptr+=mt_len;
1565 tmp-=mt_len;
1566
1567 ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type);
1568 if (ext_is_len == 0) /* did something go wrong ? */
1569 goto trunctlv;
1570
1571 tmp-=ext_is_len;
1572 tptr+=ext_is_len;
1573 }
1574 break;
1575
1576 case TLV_IS_ALIAS_ID:
1577 while (tmp >= NODE_ID_LEN+1) { /* is it worth attempting a decode ? */
1578 ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type);
1579 if (ext_is_len == 0) /* did something go wrong ? */
1580 goto trunctlv;
1581 tmp-=ext_is_len;
1582 tptr+=ext_is_len;
1583 }
1584 break;
1585
1586 case TLV_EXT_IS_REACH:
1587 while (tmp >= NODE_ID_LEN+3+1) { /* is it worth attempting a decode ? */
1588 ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type);
1589 if (ext_is_len == 0) /* did something go wrong ? */
1590 goto trunctlv;
1591 tmp-=ext_is_len;
1592 tptr+=ext_is_len;
1593 }
1594 break;
1595 case TLV_IS_REACH:
1596 if (!TTEST2(*tptr,1)) /* check if there is one byte left to read out the virtual flag */
1597 goto trunctlv;
1598 printf("\n\t %s",
1599 tok2str(isis_is_reach_virtual_values,
1600 "bogus virtual flag 0x%02x",
1601 *tptr++));
1602 tlv_is_reach = (const struct isis_tlv_is_reach *)tptr;
1603 while (tmp >= sizeof(struct isis_tlv_is_reach)) {
1604 if (!TTEST(*tlv_is_reach))
1605 goto trunctlv;
1606 printf("\n\t IS Neighbor: %s",
1607 isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN));
1608 isis_print_metric_block(&tlv_is_reach->isis_metric_block);
1609 tmp -= sizeof(struct isis_tlv_is_reach);
1610 tlv_is_reach++;
1611 }
1612 break;
1613
1614 case TLV_ESNEIGH:
1615 tlv_es_reach = (const struct isis_tlv_es_reach *)tptr;
1616 while (tmp >= sizeof(struct isis_tlv_es_reach)) {
1617 if (!TTEST(*tlv_es_reach))
1618 goto trunctlv;
1619 printf("\n\t ES Neighbor: %s",
1620 isis_print_id(tlv_es_reach->neighbor_sysid,SYSTEM_ID_LEN));
1621 isis_print_metric_block(&tlv_es_reach->isis_metric_block);
1622 tmp -= sizeof(struct isis_tlv_es_reach);
1623 tlv_es_reach++;
1624 }
1625 break;
1626
1627 /* those two TLVs share the same format */
1628 case TLV_INT_IP_REACH:
1629 case TLV_EXT_IP_REACH:
1630 if (!isis_print_tlv_ip_reach(pptr, "\n\t ", tlv_len))
1631 return (1);
1632 break;
1633
1634 case TLV_EXTD_IP_REACH:
1635 while (tmp>0) {
1636 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV4);
1637 if (ext_ip_len == 0) /* did something go wrong ? */
1638 goto trunctlv;
1639 tptr+=ext_ip_len;
1640 tmp-=ext_ip_len;
1641 }
1642 break;
1643
1644 case TLV_MT_IP_REACH:
1645 while (tmp>0) {
1646 mt_len = isis_print_mtid(tptr, "\n\t ");
1647 if (mt_len == 0) /* did something go wrong ? */
1648 goto trunctlv;
1649 tptr+=mt_len;
1650 tmp-=mt_len;
1651
1652 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV4);
1653 if (ext_ip_len == 0) /* did something go wrong ? */
1654 goto trunctlv;
1655 tptr+=ext_ip_len;
1656 tmp-=ext_ip_len;
1657 }
1658 break;
1659
1660 #ifdef INET6
1661 case TLV_IP6_REACH:
1662 while (tmp>0) {
1663 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6);
1664 if (ext_ip_len == 0) /* did something go wrong ? */
1665 goto trunctlv;
1666 tptr+=ext_ip_len;
1667 tmp-=ext_ip_len;
1668 }
1669 break;
1670
1671 case TLV_MT_IP6_REACH:
1672 while (tmp>0) {
1673 mt_len = isis_print_mtid(tptr, "\n\t ");
1674 if (mt_len == 0) /* did something go wrong ? */
1675 goto trunctlv;
1676 tptr+=mt_len;
1677 tmp-=mt_len;
1678
1679 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6);
1680 if (ext_ip_len == 0) /* did something go wrong ? */
1681 goto trunctlv;
1682 tptr+=ext_ip_len;
1683 tmp-=ext_ip_len;
1684 }
1685 break;
1686
1687 case TLV_IP6ADDR:
1688 while (tmp>0) {
1689 if (!TTEST2(*tptr, 16))
1690 goto trunctlv;
1691
1692 printf("\n\t IPv6 interface address: %s",
1693 ip6addr_string(tptr));
1694
1695 tptr += 16;
1696 tmp -= 16;
1697 }
1698 break;
1699 #endif
1700 case TLV_AUTH:
1701 if (!TTEST2(*tptr, 1))
1702 goto trunctlv;
1703
1704 printf("\n\t %s: ",
1705 tok2str(isis_subtlv_auth_values,
1706 "unknown Authentication type 0x%02x",
1707 *tptr));
1708
1709 switch (*tptr) {
1710 case SUBTLV_AUTH_SIMPLE:
1711 for(i=1;i<tlv_len;i++) {
1712 if (!TTEST2(*(tptr+i), 1))
1713 goto trunctlv;
1714 printf("%c",*(tptr+i));
1715 }
1716 break;
1717 case SUBTLV_AUTH_MD5:
1718 for(i=1;i<tlv_len;i++) {
1719 if (!TTEST2(*(tptr+i), 1))
1720 goto trunctlv;
1721 printf("%02x",*(tptr+i));
1722 }
1723 if (tlv_len != SUBTLV_AUTH_MD5_LEN+1)
1724 printf(", (malformed subTLV) ");
1725 break;
1726 case SUBTLV_AUTH_PRIVATE:
1727 default:
1728 if(!print_unknown_data(tptr+1,"\n\t\t ",tlv_len-1))
1729 return(0);
1730 break;
1731 }
1732 break;
1733
1734 case TLV_PTP_ADJ:
1735 tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr;
1736 if(tmp>=1) {
1737 if (!TTEST2(*tptr, 1))
1738 goto trunctlv;
1739 printf("\n\t Adjacency State: %s (%u)",
1740 tok2str(isis_ptp_adjancey_values, "unknown", *tptr),
1741 *tptr);
1742 tmp--;
1743 }
1744 if(tmp>sizeof(tlv_ptp_adj->extd_local_circuit_id)) {
1745 if (!TTEST2(tlv_ptp_adj->extd_local_circuit_id,
1746 sizeof(tlv_ptp_adj->extd_local_circuit_id)))
1747 goto trunctlv;
1748 printf("\n\t Extended Local circuit-ID: 0x%08x",
1749 EXTRACT_32BITS(tlv_ptp_adj->extd_local_circuit_id));
1750 tmp-=sizeof(tlv_ptp_adj->extd_local_circuit_id);
1751 }
1752 if(tmp>=SYSTEM_ID_LEN) {
1753 if (!TTEST2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN))
1754 goto trunctlv;
1755 printf("\n\t Neighbor System-ID: %s",
1756 isis_print_id(tlv_ptp_adj->neighbor_sysid,SYSTEM_ID_LEN));
1757 tmp-=SYSTEM_ID_LEN;
1758 }
1759 if(tmp>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) {
1760 if (!TTEST2(tlv_ptp_adj->neighbor_extd_local_circuit_id,
1761 sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)))
1762 goto trunctlv;
1763 printf("\n\t Neighbor Extended Local circuit-ID: 0x%08x",
1764 EXTRACT_32BITS(tlv_ptp_adj->neighbor_extd_local_circuit_id));
1765 }
1766 break;
1767
1768 case TLV_PROTOCOLS:
1769 printf("\n\t NLPID(s): ");
1770 while (tmp>0) {
1771 if (!TTEST2(*(tptr), 1))
1772 goto trunctlv;
1773 printf("%s (0x%02x)",
1774 tok2str(osi_nlpid_values,
1775 "unknown",
1776 *tptr),
1777 *tptr);
1778 if (tmp>1) /* further NPLIDs ? - put comma */
1779 printf(", ");
1780 tptr++;
1781 tmp--;
1782 }
1783 break;
1784
1785 case TLV_TE_ROUTER_ID:
1786 if (!TTEST2(*pptr, 4))
1787 goto trunctlv;
1788 printf("\n\t Traffic Engineering Router ID: %s", ipaddr_string(pptr));
1789 break;
1790
1791 case TLV_IPADDR:
1792 while (tmp>0) {
1793 if (!TTEST2(*tptr, 4))
1794 goto trunctlv;
1795 printf("\n\t IPv4 interface address: %s", ipaddr_string(tptr));
1796 tptr += 4;
1797 tmp -= 4;
1798 }
1799 break;
1800
1801 case TLV_HOSTNAME:
1802 printf("\n\t Hostname: ");
1803 while (tmp>0) {
1804 if (!TTEST2(*tptr, 1))
1805 goto trunctlv;
1806 printf("%c",*tptr++);
1807 tmp--;
1808 }
1809 break;
1810
1811 case TLV_SHARED_RISK_GROUP:
1812 if (!TTEST2(*tptr, NODE_ID_LEN))
1813 goto trunctlv;
1814 printf("\n\t IS Neighbor: %s", isis_print_id(tptr, NODE_ID_LEN));
1815 tptr+=(NODE_ID_LEN);
1816 tmp-=(NODE_ID_LEN);
1817
1818 if (!TTEST2(*tptr, 1))
1819 goto trunctlv;
1820 printf(", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered");
1821 tmp--;
1822
1823 if (!TTEST2(*tptr,4))
1824 goto trunctlv;
1825 printf("\n\t IPv4 interface address: %s", ipaddr_string(tptr));
1826 tptr+=4;
1827 tmp-=4;
1828
1829 if (!TTEST2(*tptr,4))
1830 goto trunctlv;
1831 printf("\n\t IPv4 neighbor address: %s", ipaddr_string(tptr));
1832 tptr+=4;
1833 tmp-=4;
1834
1835 while (tmp>0) {
1836 if (!TTEST2(*tptr, 4))
1837 goto trunctlv;
1838 printf("\n\t Link-ID: 0x%08x", EXTRACT_32BITS(tptr));
1839 tptr+=4;
1840 tmp-=4;
1841 }
1842 break;
1843
1844 case TLV_LSP:
1845 tlv_lsp = (const struct isis_tlv_lsp *)tptr;
1846 while(tmp>0) {
1847 if (!TTEST((tlv_lsp->lsp_id)[LSP_ID_LEN-1]))
1848 goto trunctlv;
1849 printf("\n\t lsp-id: %s",
1850 isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN));
1851 if (!TTEST2(tlv_lsp->sequence_number, 4))
1852 goto trunctlv;
1853 printf(", seq: 0x%08x",EXTRACT_32BITS(tlv_lsp->sequence_number));
1854 if (!TTEST2(tlv_lsp->remaining_lifetime, 2))
1855 goto trunctlv;
1856 printf(", lifetime: %5ds",EXTRACT_16BITS(tlv_lsp->remaining_lifetime));
1857 if (!TTEST2(tlv_lsp->checksum, 2))
1858 goto trunctlv;
1859 printf(", chksum: 0x%04x",EXTRACT_16BITS(tlv_lsp->checksum));
1860 tmp-=sizeof(struct isis_tlv_lsp);
1861 tlv_lsp++;
1862 }
1863 break;
1864
1865 case TLV_CHECKSUM:
1866 if (!TTEST2(*tptr, 2))
1867 goto trunctlv;
1868 printf("\n\t checksum: 0x%04x ", EXTRACT_16BITS(tptr));
1869 /* do not attempt to verify the checksum if it is zero
1870 * most likely a HMAC-MD5 TLV is also present and
1871 * to avoid conflicts the checksum TLV is zeroed.
1872 * see rfc3358 for details
1873 */
1874 if (EXTRACT_16BITS(tptr) == 0)
1875 printf("(unverified)");
1876 else printf("(%s)", osi_cksum(optr, length) ? "incorrect" : "correct");
1877 break;
1878
1879 case TLV_MT_SUPPORTED:
1880 while (tmp>1) {
1881 /* length can only be a multiple of 2, otherwise there is
1882 something broken -> so decode down until length is 1 */
1883 if (tmp!=1) {
1884 mt_len = isis_print_mtid(tptr, "\n\t ");
1885 if (mt_len == 0) /* did something go wrong ? */
1886 goto trunctlv;
1887 tptr+=mt_len;
1888 tmp-=mt_len;
1889 } else {
1890 printf("\n\t malformed MT-ID");
1891 break;
1892 }
1893 }
1894 break;
1895
1896 case TLV_RESTART_SIGNALING:
1897 if (!TTEST2(*tptr, 3))
1898 goto trunctlv;
1899 printf("\n\t Flags [%s], Remaining holding time %us",
1900 bittok2str(isis_restart_flag_values, "none", *tptr),
1901 EXTRACT_16BITS(tptr+1));
1902 tptr+=3;
1903 break;
1904
1905 case TLV_IDRP_INFO:
1906 if (!TTEST2(*tptr, 1))
1907 goto trunctlv;
1908 printf("\n\t Inter-Domain Information Type: %s",
1909 tok2str(isis_subtlv_idrp_values,
1910 "Unknown (0x%02x)",
1911 *tptr));
1912 switch (*tptr++) {
1913 case SUBTLV_IDRP_ASN:
1914 if (!TTEST2(*tptr, 2)) /* fetch AS number */
1915 goto trunctlv;
1916 printf("AS Number: %u",EXTRACT_16BITS(tptr));
1917 break;
1918 case SUBTLV_IDRP_LOCAL:
1919 case SUBTLV_IDRP_RES:
1920 default:
1921 if(!print_unknown_data(tptr,"\n\t ",tlv_len-1))
1922 return(0);
1923 break;
1924 }
1925 break;
1926
1927 case TLV_LSP_BUFFERSIZE:
1928 if (!TTEST2(*tptr, 2))
1929 goto trunctlv;
1930 printf("\n\t LSP Buffersize: %u",EXTRACT_16BITS(tptr));
1931 break;
1932
1933 case TLV_PART_DIS:
1934 while (tmp >= SYSTEM_ID_LEN) {
1935 if (!TTEST2(*tptr, SYSTEM_ID_LEN))
1936 goto trunctlv;
1937 printf("\n\t %s",isis_print_id(tptr,SYSTEM_ID_LEN));
1938 tptr+=SYSTEM_ID_LEN;
1939 tmp-=SYSTEM_ID_LEN;
1940 }
1941 break;
1942
1943 case TLV_PREFIX_NEIGH:
1944 if (!TTEST2(*tptr, sizeof(struct isis_metric_block)))
1945 goto trunctlv;
1946 printf("\n\t Metric Block");
1947 isis_print_metric_block((const struct isis_metric_block *)tptr);
1948 tptr+=sizeof(struct isis_metric_block);
1949 tmp-=sizeof(struct isis_metric_block);
1950
1951 while(tmp>0) {
1952 if (!TTEST2(*tptr, 1))
1953 goto trunctlv;
1954 prefix_len=*tptr++; /* read out prefix length in semioctets*/
1955 tmp--;
1956 if (!TTEST2(*tptr, prefix_len/2))
1957 goto trunctlv;
1958 printf("\n\t\tAddress: %s/%u",
1959 print_nsap(tptr,prefix_len/2),
1960 prefix_len*4);
1961 tptr+=prefix_len/2;
1962 tmp-=prefix_len/2;
1963 }
1964 break;
1965
1966 case TLV_IIH_SEQNR:
1967 if (!TTEST2(*tptr, 4)) /* check if four bytes are on the wire */
1968 goto trunctlv;
1969 printf("\n\t Sequence number: %u", EXTRACT_32BITS(tptr) );
1970 break;
1971
1972 case TLV_VENDOR_PRIVATE:
1973 if (!TTEST2(*tptr, 3)) /* check if enough byte for a full oui */
1974 goto trunctlv;
1975 printf("\n\t Vendor OUI Code: 0x%06x", EXTRACT_24BITS(tptr) );
1976 tptr+=3;
1977 tmp-=3;
1978 if (tmp > 0) /* hexdump the rest */
1979 if(!print_unknown_data(tptr,"\n\t\t",tmp))
1980 return(0);
1981 break;
1982 /*
1983 * FIXME those are the defined TLVs that lack a decoder
1984 * you are welcome to contribute code ;-)
1985 */
1986
1987 case TLV_DECNET_PHASE4:
1988 case TLV_LUCENT_PRIVATE:
1989 case TLV_IPAUTH:
1990 case TLV_NORTEL_PRIVATE1:
1991 case TLV_NORTEL_PRIVATE2:
1992
1993 default:
1994 if (vflag <= 1) {
1995 if(!print_unknown_data(pptr,"\n\t\t",tlv_len))
1996 return(0);
1997 }
1998 break;
1999 }
2000 /* do we want to see an additionally hexdump ? */
2001 if (vflag> 1) {
2002 if(!print_unknown_data(pptr,"\n\t ",tlv_len))
2003 return(0);
2004 }
2005
2006 pptr += tlv_len;
2007 packet_len -= tlv_len;
2008 }
2009
2010 if (packet_len != 0) {
2011 printf("\n\t %u straggler bytes", packet_len);
2012 }
2013 return (1);
2014
2015 trunc:
2016 fputs("[|isis]", stdout);
2017 return (1);
2018
2019 trunctlv:
2020 printf("\n\t\t packet exceeded snapshot");
2021 return(1);
2022 }
2023
2024 /*
2025 * Verify the checksum. See 8473-1, Appendix C, section C.4.
2026 */
2027
2028 static int
2029 osi_cksum(const u_int8_t *tptr, u_int len)
2030 {
2031 int32_t c0 = 0, c1 = 0;
2032
2033 while ((int)--len >= 0) {
2034 c0 += *tptr++;
2035 c0 %= 255;
2036 c1 += c0;
2037 c1 %= 255;
2038 }
2039 return (c0 | c1);
2040 }
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