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verify/warn icmpv6 checksum. from jinmei@kame
[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[] =
29 "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.82 2003-05-01 18:04:41 guy 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
47 #define NLPID_CLNS 129 /* 0x81 */
48 #define NLPID_ESIS 130 /* 0x82 */
49 #define NLPID_ISIS 131 /* 0x83 */
50 #define NLPID_IP6 0x8e
51 #define NLPID_IP 0xcc
52 #define NLPID_NULLNS 0
53
54 #define IPV4 1 /* AFI value */
55 #define IPV6 2 /* AFI value */
56
57 /*
58 * IS-IS is defined in ISO 10589. Look there for protocol definitions.
59 */
60
61 #define SYSTEM_ID_LEN ETHER_ADDR_LEN
62 #define NODE_ID_LEN SYSTEM_ID_LEN+1
63 #define LSP_ID_LEN SYSTEM_ID_LEN+2
64
65 #define ISIS_VERSION 1
66 #define PDU_TYPE_MASK 0x1F
67 #define PRIORITY_MASK 0x7F
68
69 #define L1_LAN_IIH 15
70 #define L2_LAN_IIH 16
71 #define PTP_IIH 17
72 #define L1_LSP 18
73 #define L2_LSP 20
74 #define L1_CSNP 24
75 #define L2_CSNP 25
76 #define L1_PSNP 26
77 #define L2_PSNP 27
78
79 static struct tok isis_pdu_values[] = {
80 { L1_LAN_IIH, "L1 Lan IIH"},
81 { L2_LAN_IIH, "L2 Lan IIH"},
82 { PTP_IIH, "p2p IIH"},
83 { L1_LSP, "L1 LSP"},
84 { L2_LSP, "L2 LSP"},
85 { L1_CSNP, "L1 CSNP"},
86 { L2_CSNP, "L2 CSNP"},
87 { L1_PSNP, "L1 PSNP"},
88 { L2_PSNP, "L2 PSNP"},
89 { 0, NULL}
90 };
91
92 /*
93 * A TLV is a tuple of a type, length and a value and is normally used for
94 * encoding information in all sorts of places. This is an enumeration of
95 * the well known types.
96 *
97 * list taken from rfc3359 plus some memory from veterans ;-)
98 */
99
100 #define TLV_AREA_ADDR 1 /* iso10589 */
101 #define TLV_IS_REACH 2 /* iso10589 */
102 #define TLV_ESNEIGH 3 /* iso10589 */
103 #define TLV_PART_DIS 4 /* iso10589 */
104 #define TLV_PREFIX_NEIGH 5 /* iso10589 */
105 #define TLV_ISNEIGH 6 /* iso10589 */
106 #define TLV_ISNEIGH_VARLEN 7 /* iso10589 */
107 #define TLV_PADDING 8 /* iso10589 */
108 #define TLV_LSP 9 /* iso10589 */
109 #define TLV_AUTH 10 /* iso10589, draft-ietf-isis-hmac-03 */
110 #define TLV_CHECKSUM 12 /* rfc3358 */
111 #define TLV_LSP_BUFFERSIZE 14 /* iso10589 rev2 */
112 #define TLV_EXT_IS_REACH 22 /* draft-ietf-isis-traffic-04 */
113 #define TLV_IS_ALIAS_ID 24 /* draft-ietf-isis-ext-lsp-frags-02 */
114 #define TLV_DECNET_PHASE4 42
115 #define TLV_LUCENT_PRIVATE 66
116 #define TLV_IP_REACH 128 /* rfc1195, rfc2966 */
117 #define TLV_PROTOCOLS 129 /* rfc1195 */
118 #define TLV_IP_REACH_EXT 130 /* rfc1195, rfc2966 */
119 #define TLV_IDRP_INFO 131 /* rfc1195 */
120 #define TLV_IPADDR 132 /* rfc1195 */
121 #define TLV_IPAUTH 133 /* rfc1195 */
122 #define TLV_TE_ROUTER_ID 134 /* draft-ietf-isis-traffic-04 */
123 #define TLV_EXT_IP_REACH 135 /* draft-ietf-isis-traffic-04 */
124 #define TLV_HOSTNAME 137 /* rfc2763 */
125 #define TLV_SHARED_RISK_GROUP 138 /* draft-ietf-isis-gmpls-extensions-14 */
126 #define TLV_NORTEL_PRIVATE1 176
127 #define TLV_NORTEL_PRIVATE2 177
128 #define TLV_HOLDTIME 198 /* ES-IS */
129 #define TLV_RESTART_SIGNALING 211 /* draft-ietf-isis-restart-01 */
130 #define TLV_MT_IS_REACH 222 /* draft-ietf-isis-wg-multi-topology-05 */
131 #define TLV_MT_SUPPORTED 229 /* draft-ietf-isis-wg-multi-topology-05 */
132 #define TLV_IP6ADDR 232 /* draft-ietf-isis-ipv6-02 */
133 #define TLV_MT_IP_REACH 235 /* draft-ietf-isis-wg-multi-topology-05 */
134 #define TLV_IP6_REACH 236 /* draft-ietf-isis-ipv6-02 */
135 #define TLV_MT_IP6_REACH 237 /* draft-ietf-isis-wg-multi-topology-05 */
136 #define TLV_PTP_ADJ 240 /* rfc3373 */
137 #define TLV_IIH_SEQNR 241 /* draft-shen-isis-iih-sequence-00 */
138 #define TLV_VENDOR_PRIVATE 250 /* draft-ietf-isis-proprietary-tlv-00 */
139
140 static struct tok isis_tlv_values[] = {
141 { TLV_AREA_ADDR, "Area address(es)"},
142 { TLV_IS_REACH, "IS Reachability"},
143 { TLV_ESNEIGH, "ES Neighbor(s)"},
144 { TLV_PART_DIS, "Partition DIS"},
145 { TLV_PREFIX_NEIGH, "Prefix Neighbors"},
146 { TLV_ISNEIGH, "IS Neighbor(s)"},
147 { TLV_ISNEIGH_VARLEN, "IS Neighbor(s) (variable length)"},
148 { TLV_PADDING, "Padding"},
149 { TLV_LSP, "LSP entries"},
150 { TLV_AUTH, "Authentication"},
151 { TLV_CHECKSUM, "Checksum"},
152 { TLV_LSP_BUFFERSIZE, "LSP Buffersize"},
153 { TLV_EXT_IS_REACH, "Extended IS Reachability"},
154 { TLV_IS_ALIAS_ID, "IS Alias ID"},
155 { TLV_DECNET_PHASE4, "DECnet Phase IV"},
156 { TLV_LUCENT_PRIVATE, "Lucent Proprietary"},
157 { TLV_IP_REACH, "IPv4 Internal reachability"},
158 { TLV_PROTOCOLS, "Protocols supported"},
159 { TLV_IP_REACH_EXT, "IPv4 External reachability"},
160 { TLV_IDRP_INFO, "Inter-Domain Information Type"},
161 { TLV_IPADDR, "IPv4 Interface address(es)"},
162 { TLV_IPAUTH, "IPv4 authentication (deprecated)"},
163 { TLV_TE_ROUTER_ID, "Traffic Engineering Router ID"},
164 { TLV_EXT_IP_REACH, "Extended IPv4 reachability"},
165 { TLV_HOSTNAME, "Hostname"},
166 { TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"},
167 { TLV_NORTEL_PRIVATE1, "Nortel Proprietary"},
168 { TLV_NORTEL_PRIVATE2, "Nortel Proprietary"},
169 { TLV_HOLDTIME, "Holdtime"},
170 { TLV_RESTART_SIGNALING, "Restart Signaling"},
171 { TLV_MT_IS_REACH, "Multi Topology IS Reachability"},
172 { TLV_MT_SUPPORTED, "Multi Topology"},
173 { TLV_IP6ADDR, "IPv6 Interface address(es)"},
174 { TLV_MT_IP_REACH, "Multi-Topology IPv4 reachability"},
175 { TLV_IP6_REACH, "IPv6 reachability"},
176 { TLV_MT_IP6_REACH, "Multi-Topology IP6 reachability"},
177 { TLV_PTP_ADJ, "Point-to-point Adjacency State"},
178 { TLV_IIH_SEQNR, "Hello PDU Sequence Number"},
179 { TLV_VENDOR_PRIVATE, "Vendor Private"},
180 { 0, NULL }
181 };
182
183 #define SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3
184 #define SUBTLV_EXT_IS_REACH_LINK_LOCAL_ID 4
185 #define SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5
186 #define SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6
187 #define SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8
188 #define SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9
189 #define SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10
190 #define SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11
191 #define SUBTLV_EXT_IS_REACH_TE_METRIC 18
192 #define SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20
193 #define SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21
194
195 #define SUBTLV_IP_REACH_ADMIN_TAG32 1
196 #define SUBTLV_IP_REACH_ADMIN_TAG64 2
197
198 #define SUBTLV_AUTH_SIMPLE 1
199 #define SUBTLV_AUTH_MD5 54
200 #define SUBTLV_AUTH_MD5_LEN 16
201 #define SUBTLV_AUTH_PRIVATE 255
202
203 static struct tok isis_subtlv_auth_values[] = {
204 { SUBTLV_AUTH_SIMPLE, "simple text password"},
205 { SUBTLV_AUTH_MD5, "HMAC-MD5 password"},
206 { SUBTLV_AUTH_PRIVATE, "Routing Domain private password"},
207 { 0, NULL }
208 };
209
210 #define SUBTLV_IDRP_RES 0
211 #define SUBTLV_IDRP_LOCAL 1
212 #define SUBTLV_IDRP_ASN 2
213
214 static struct tok isis_subtlv_idrp_values[] = {
215 { SUBTLV_IDRP_RES, "Reserved"},
216 { SUBTLV_IDRP_LOCAL, "Routing-Domain Specific"},
217 { SUBTLV_IDRP_ASN, "AS Number Tag"},
218 { 0, NULL}
219 };
220
221 #define ISIS_8BIT_MASK(x) ((x)&0xff)
222
223 #define ISIS_MASK_LSP_OL_BIT(x) ((x)&0x4)
224 #define ISIS_MASK_LSP_ISTYPE_BITS(x) ((x)&0x3)
225 #define ISIS_MASK_LSP_PARTITION_BIT(x) ((x)&0x80)
226 #define ISIS_MASK_LSP_ATT_BITS(x) ((x)&0x78)
227 #define ISIS_MASK_LSP_ATT_ERROR_BIT(x) ((x)&0x40)
228 #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) ((x)&0x20)
229 #define ISIS_MASK_LSP_ATT_DELAY_BIT(x) ((x)&0x10)
230 #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) ((x)&0x8)
231
232 #define ISIS_MASK_MTID(x) ((x)&0x0fff)
233 #define ISIS_MASK_MTFLAGS(x) ((x)&0xf000)
234
235 static struct tok isis_mt_flag_values[] = {
236 { 0x4000, "sub-TLVs present"},
237 { 0x8000, "ATT bit set"},
238 { 0, NULL}
239 };
240
241 #define ISIS_MASK_TLV_EXT_IP_UPDOWN(x) ((x)&0x80)
242 #define ISIS_MASK_TLV_EXT_IP_SUBTLV(x) ((x)&0x40)
243
244 #define ISIS_MASK_TLV_EXT_IP6_IE(x) ((x)&0x40)
245 #define ISIS_MASK_TLV_EXT_IP6_SUBTLV(x) ((x)&0x20)
246
247 #define ISIS_MASK_TLV_RESTART_RR(x) ((x)&0x1)
248 #define ISIS_MASK_TLV_RESTART_RA(x) ((x)&0x2)
249
250 #define ISIS_LSP_TLV_METRIC_SUPPORTED(x) ((x)&0x80)
251 #define ISIS_LSP_TLV_METRIC_IE(x) ((x)&0x40)
252 #define ISIS_LSP_TLV_METRIC_UPDOWN(x) ((x)&0x80)
253 #define ISIS_LSP_TLV_METRIC_VALUE(x) ((x)&0x3f)
254
255 #define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1)
256
257 static struct tok isis_gmpls_link_prot_values[] = {
258 { 0x01, "Extra Traffic"},
259 { 0x02, "Unprotected"},
260 { 0x04, "Shared"},
261 { 0x08, "Dedicated 1:1"},
262 { 0x10, "Dedicated 1+1"},
263 { 0x20, "Enhanced"},
264 { 0x40, "Reserved"},
265 { 0x80, "Reserved"},
266 { 0, NULL }
267 };
268
269 static struct tok isis_gmpls_sw_cap_values[] = {
270 { 1, "Packet-Switch Capable-1"},
271 { 2, "Packet-Switch Capable-2"},
272 { 3, "Packet-Switch Capable-3"},
273 { 4, "Packet-Switch Capable-4"},
274 { 51, "Layer-2 Switch Capable"},
275 { 100, "Time-Division-Multiplex"},
276 { 150, "Lambda-Switch Capable"},
277 { 200, "Fiber-Switch Capable"},
278 { 0, NULL }
279 };
280
281 static struct tok isis_gmpls_lsp_enc_values[] = {
282 { 1, "Packet"},
283 { 2, "Ethernet V2/DIX"},
284 { 3, "ANSI PDH"},
285 { 4, "ETSI PDH"},
286 { 5, "SDH ITU-T G.707"},
287 { 6, "SONET ANSI T1.105"},
288 { 7, "Digital Wrapper"},
289 { 8, "Lambda (photonic)"},
290 { 9, "Fiber"},
291 { 10, "Ethernet 802.3"},
292 { 11, "FiberChannel"},
293 { 0, NULL }
294 };
295
296 static struct tok isis_mt_values[] = {
297 { 0, "IPv4 unicast"},
298 { 1, "In-Band Management"},
299 { 2, "IPv6 unicast"},
300 { 3, "Multicast"},
301 { 4095, "Development, Experimental or Proprietary"},
302 { 0, NULL }
303 };
304
305 static struct tok isis_iih_circuit_type_values[] = {
306 { 1, "Level 1 only"},
307 { 2, "Level 2 only"},
308 { 3, "Level 1, Level 2"},
309 { 0, NULL}
310 };
311
312 #define ISIS_LSP_TYPE_UNUSED0 0
313 #define ISIS_LSP_TYPE_LEVEL_1 1
314 #define ISIS_LSP_TYPE_UNUSED2 2
315 #define ISIS_LSP_TYPE_LEVEL_2 3
316
317 static struct tok isis_lsp_istype_values[] = {
318 { ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"},
319 { ISIS_LSP_TYPE_LEVEL_1, "L1 IS"},
320 { ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"},
321 { ISIS_LSP_TYPE_LEVEL_2, "L1L2 IS"},
322 { 0, NULL }
323 };
324
325 static struct tok osi_nlpid_values[] = {
326 { NLPID_CLNS, "CLNS"},
327 { NLPID_IP, "IPv4"},
328 { NLPID_IP6, "IPv6"},
329 { 0, NULL }
330 };
331
332 /*
333 * Katz's point to point adjacency TLV uses codes to tell us the state of
334 * the remote adjacency. Enumerate them.
335 */
336
337 #define ISIS_PTP_ADJ_UP 0
338 #define ISIS_PTP_ADJ_INIT 1
339 #define ISIS_PTP_ADJ_DOWN 2
340
341
342 static struct tok isis_ptp_adjancey_values[] = {
343 { ISIS_PTP_ADJ_UP, "Up" },
344 { ISIS_PTP_ADJ_INIT, "Initializing" },
345 { ISIS_PTP_ADJ_DOWN, "Down" },
346 { 0, NULL}
347 };
348
349 struct isis_tlv_ptp_adj {
350 u_int8_t adjacency_state;
351 u_int8_t extd_local_circuit_id[4];
352 u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
353 u_int8_t neighbor_extd_local_circuit_id[4];
354 };
355
356 static int osi_cksum(const u_int8_t *, u_int);
357 static void esis_print(const u_int8_t *, u_int);
358 static int isis_print(const u_int8_t *, u_int);
359
360 struct isis_metric_block {
361 u_int8_t metric_default;
362 u_int8_t metric_delay;
363 u_int8_t metric_expense;
364 u_int8_t metric_error;
365 };
366
367 struct isis_tlv_is_reach {
368 struct isis_metric_block isis_metric_block;
369 u_int8_t neighbor_nodeid[NODE_ID_LEN];
370 };
371
372 struct isis_tlv_es_reach {
373 struct isis_metric_block isis_metric_block;
374 u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
375 };
376
377 struct isis_tlv_ip_reach {
378 struct isis_metric_block isis_metric_block;
379 u_int8_t prefix[4];
380 u_int8_t mask[4];
381 };
382
383 static struct tok isis_is_reach_virtual_values[] = {
384 { 0, "IsNotVirtual"},
385 { 1, "IsVirtual"},
386 { 0, NULL }
387 };
388
389 struct isis_common_header {
390 u_int8_t nlpid;
391 u_int8_t fixed_len;
392 u_int8_t version; /* Protocol version */
393 u_int8_t id_length;
394 u_int8_t pdu_type; /* 3 MSbits are reserved */
395 u_int8_t pdu_version; /* Packet format version */
396 u_int8_t reserved;
397 u_int8_t max_area;
398 };
399
400 struct isis_iih_lan_header {
401 u_int8_t circuit_type;
402 u_int8_t source_id[SYSTEM_ID_LEN];
403 u_int8_t holding_time[2];
404 u_int8_t pdu_len[2];
405 u_int8_t priority;
406 u_int8_t lan_id[NODE_ID_LEN];
407 };
408
409 struct isis_iih_ptp_header {
410 u_int8_t circuit_type;
411 u_int8_t source_id[SYSTEM_ID_LEN];
412 u_int8_t holding_time[2];
413 u_int8_t pdu_len[2];
414 u_int8_t circuit_id;
415 };
416
417 struct isis_lsp_header {
418 u_int8_t pdu_len[2];
419 u_int8_t remaining_lifetime[2];
420 u_int8_t lsp_id[LSP_ID_LEN];
421 u_int8_t sequence_number[4];
422 u_int8_t checksum[2];
423 u_int8_t typeblock;
424 };
425
426 struct isis_csnp_header {
427 u_int8_t pdu_len[2];
428 u_int8_t source_id[NODE_ID_LEN];
429 u_int8_t start_lsp_id[LSP_ID_LEN];
430 u_int8_t end_lsp_id[LSP_ID_LEN];
431 };
432
433 struct isis_psnp_header {
434 u_int8_t pdu_len[2];
435 u_int8_t source_id[NODE_ID_LEN];
436 };
437
438 struct isis_tlv_lsp {
439 u_int8_t remaining_lifetime[2];
440 u_int8_t lsp_id[LSP_ID_LEN];
441 u_int8_t sequence_number[4];
442 u_int8_t checksum[2];
443 };
444
445
446 /* allocate space for the following string
447 * xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx
448 * 32 bytes plus one termination byte */
449 static char *
450 print_nsap(register const u_int8_t *pptr, register int nsap_length)
451 {
452 int nsap_idx;
453 static char nsap_ascii_output[33];
454 char *junk_buf = nsap_ascii_output;
455
456 if (nsap_length < 1 || nsap_length > 13) {
457 sprintf(junk_buf, "illegal length");
458 return (nsap_ascii_output);
459 }
460
461 for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
462 if (!TTEST2(*pptr, 1))
463 return (0);
464 sprintf(junk_buf, "%02x", *pptr++);
465 junk_buf += strlen(junk_buf);
466 if (((nsap_idx & 1) == 0) &&
467 (nsap_idx + 1 < nsap_length)) {
468 *junk_buf++ = '.';
469 }
470 }
471 *(junk_buf) = '\0';
472 return (nsap_ascii_output);
473 }
474
475 #define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
476 #define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header))
477 #define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header))
478 #define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header))
479 #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header))
480 #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header))
481
482 void isoclns_print(const u_int8_t *p, u_int length, u_int caplen,
483 const u_int8_t *esrc, const u_int8_t *edst)
484 {
485 u_int8_t pdu_type;
486 const struct isis_common_header *header;
487
488 header = (const struct isis_common_header *)p;
489 pdu_type = header->pdu_type & PDU_TYPE_MASK;
490
491 printf("%sOSI ", caplen < 1 ? "|" : "");
492 if (!eflag && esrc != NULL && edst != NULL)
493 (void)printf("%s > %s, ",
494 etheraddr_string(esrc),
495 etheraddr_string(edst));
496
497 if (caplen < 1) /* enough bytes on the wire ? */
498 return;
499
500 switch (*p) {
501
502 case NLPID_CLNS:
503 (void)printf("CLNS, length: %u", length);
504 break;
505
506 case NLPID_ESIS:
507 esis_print(p, length);
508 return;
509
510 case NLPID_ISIS:
511 if (!isis_print(p, length))
512 print_unknown_data(p,"\n\t",caplen);
513 break;
514
515 case NLPID_NULLNS:
516 (void)printf("ISO NULLNS, length: %u", length);
517 break;
518
519 default:
520 (void)printf("Unknown NLPID 0x%02x, length: %u", p[0], length);
521 if (caplen > 1)
522 print_unknown_data(p,"\n\t",caplen);
523 break;
524 }
525 }
526
527 #define ESIS_REDIRECT 6
528 #define ESIS_ESH 2
529 #define ESIS_ISH 4
530
531 static struct tok esis_values[] = {
532 { ESIS_REDIRECT, "redirect"},
533 { ESIS_ESH, "ESH"},
534 { ESIS_ISH, "ISH"},
535 { 0, NULL }
536 };
537
538 struct esis_hdr {
539 u_int8_t version;
540 u_int8_t reserved;
541 u_int8_t type;
542 u_int8_t tmo[2];
543 u_int8_t cksum[2];
544 };
545
546 static void
547 esis_print(const u_int8_t *p, u_int length)
548 {
549 const u_int8_t *ep;
550 u_int li;
551 const struct esis_hdr *eh;
552
553 if (length <= 2) {
554 if (qflag)
555 printf(" bad pkt!");
556 else
557 printf(" no header at all!");
558 return;
559 }
560 li = p[1];
561 eh = (const struct esis_hdr *) &p[2];
562 ep = p + li;
563 if (li > length) {
564 if (qflag)
565 printf(" bad pkt!");
566 else
567 printf(" LI(%d) > PDU size (%d)!", li, length);
568 return;
569 }
570 if (li < sizeof(struct esis_hdr) + 2) {
571 if (qflag)
572 printf(" bad pkt!");
573 else {
574 printf(" too short for esis header %d:", li);
575 while (--length != 0)
576 printf("%02X", *p++);
577 }
578 return;
579 }
580
581 printf("ES-IS, %s, length: %u",
582 tok2str(esis_values,"unknown type: %u",eh->type & 0x1f),
583 length);
584
585 if(vflag < 1)
586 return;
587
588 if (vflag && osi_cksum(p, li)) {
589 printf(" bad cksum (got 0x%02x%02x)",
590 eh->cksum[1], eh->cksum[0]);
591 default_print(p, length);
592 return;
593 }
594 if (eh->version != 1) {
595 printf(" unsupported version %d", eh->version);
596 return;
597 }
598 p += sizeof(*eh) + 2;
599 li -= sizeof(*eh) + 2; /* protoid * li */
600
601 switch (eh->type & 0x1f) {
602 case ESIS_REDIRECT: {
603 const u_int8_t *dst, *snpa, *is;
604
605 dst = p; p += *p + 1;
606 if (p > snapend)
607 return;
608 printf("\n\t\t %s", isonsap_string(dst));
609 snpa = p; p += *p + 1;
610 is = p; p += *p + 1;
611 if (p > snapend)
612 return;
613 if (p > ep) {
614 printf(" [bad li]");
615 return;
616 }
617 if (is[0] == 0)
618 printf(" > %s", etheraddr_string(&snpa[1]));
619 else
620 printf(" > %s", isonsap_string(is));
621 li = ep - p;
622 break;
623 }
624
625 case ESIS_ESH:
626 break;
627
628 case ESIS_ISH: {
629 const u_int8_t *is;
630
631 is = p; p += *p + 1;
632 if (p > ep) {
633 printf(" [bad li]");
634 return;
635 }
636 if (p > snapend)
637 return;
638 if (!qflag)
639 printf("\n\tNET: %s", print_nsap(is+1,*is));
640 li = ep - p;
641 break;
642 }
643
644 default:
645 if (vflag <= 1) {
646 if (p < snapend)
647 print_unknown_data(p,"\n\t ",snapend-p);
648 }
649 return;
650 }
651
652 /* hexdump - FIXME ? */
653 if (vflag > 1) {
654 if (p < snapend)
655 print_unknown_data(p,"\n\t ",snapend-p);
656 }
657 if (vflag)
658 while (p < ep && li) {
659 u_int op, opli;
660 const u_int8_t *q;
661
662 if (snapend - p < 2)
663 return;
664 if (li < 2) {
665 printf(", bad opts/li");
666 return;
667 }
668 op = *p++;
669 opli = *p++;
670 li -= 2;
671 if (opli > li) {
672 printf(", opt (%d) too long", op);
673 return;
674 }
675 li -= opli;
676 q = p;
677 p += opli;
678
679 if (snapend < p)
680 return;
681
682 if (op == TLV_HOLDTIME && opli == 2) {
683 printf("\n\tholdtime: %us", EXTRACT_16BITS(q));
684 continue;
685 }
686
687 if (op == TLV_PROTOCOLS && opli >= 1) {
688 printf("\n\t%s (length: %u): %s",
689 tok2str(isis_tlv_values, "unknown", op),
690 opli,
691 tok2str(osi_nlpid_values,"Unknown 0x%02x",*q));
692 continue;
693 }
694
695 print_unknown_data(q,"\n\t ",opli);
696 }
697 }
698
699 /* shared routine for printing system, node and lsp-ids
700 * allocate space for the worst-case string
701 * xxxx.xxxx.xxxx.yy-zz
702 * 20 bytes plus one termination byte */
703 static char *
704 isis_print_id(const u_int8_t *cp, int id_len)
705 {
706 int i;
707 static char id[21];
708 char *pos = id;
709
710 for (i = 1; i <= SYSTEM_ID_LEN; i++) {
711 sprintf(pos, "%02x", *cp++);
712 pos += strlen(pos);
713 if (i == 2 || i == 4)
714 *pos++ = '.';
715 }
716 if (id_len == NODE_ID_LEN) {
717 sprintf(pos, ".%02x", *cp++);
718 pos += strlen(pos);
719 }
720 if (id_len == LSP_ID_LEN)
721 sprintf(pos, "-%02x", *cp);
722 return (id);
723 }
724
725 /* print the 4-byte metric block which is common found in the old-style TLVs */
726 static int
727 isis_print_metric_block (const struct isis_metric_block *isis_metric_block)
728 {
729 printf(", Default Metric: %d, %s",
730 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default),
731 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal");
732 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay))
733 printf("\n\t\t Delay Metric: %d, %s",
734 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay),
735 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal");
736 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense))
737 printf("\n\t\t Expense Metric: %d, %s",
738 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense),
739 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal");
740 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error))
741 printf("\n\t\t Error Metric: %d, %s",
742 ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error),
743 ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal");
744
745 return(1); /* everything is ok */
746 }
747
748 static int
749 isis_print_tlv_ip_reach (const u_int8_t *cp, const char *ident, int length)
750 {
751 int prefix_len;
752 const struct isis_tlv_ip_reach *tlv_ip_reach;
753
754 tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp;
755
756 while (length > 0) {
757 if ((size_t)length < sizeof(*tlv_ip_reach)) {
758 printf("short IPv4 reachability (%d vs %lu)",
759 length,
760 (unsigned long)sizeof(*tlv_ip_reach));
761 return (0);
762 }
763
764 if (!TTEST(*tlv_ip_reach))
765 return (0);
766
767 prefix_len = mask2plen(EXTRACT_32BITS(tlv_ip_reach->mask));
768
769 if (prefix_len == -1)
770 printf("%sIPv4 prefix: %s mask %s",
771 ident,
772 ipaddr_string((tlv_ip_reach->prefix)),
773 ipaddr_string((tlv_ip_reach->mask)));
774 else
775 printf("%sIPv4 prefix: %15s/%u",
776 ident,
777 ipaddr_string((tlv_ip_reach->prefix)),
778 prefix_len);
779
780 printf(", Distribution: %s, Metric: %u, %s",
781 ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up",
782 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default),
783 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal");
784
785 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay))
786 printf("%s Delay Metric: %u, %s",
787 ident,
788 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay),
789 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal");
790
791 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense))
792 printf("%s Expense Metric: %u, %s",
793 ident,
794 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense),
795 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal");
796
797 if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error))
798 printf("%s Error Metric: %u, %s",
799 ident,
800 ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error),
801 ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal");
802
803 length -= sizeof(struct isis_tlv_ip_reach);
804 tlv_ip_reach++;
805 }
806 return (1);
807 }
808
809 /*
810 * this is the common IP-REACH subTLV decoder it is called
811 * from various EXTD-IP REACH TLVs (135,235,236,237)
812 */
813
814 static int
815 isis_print_ip_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) {
816
817 switch(subt) {
818 case SUBTLV_IP_REACH_ADMIN_TAG32:
819 while (subl >= 4) {
820 if (!TTEST2(*tptr,4))
821 goto trunctlv;
822 printf("%s32-Bit Administrative tag: 0x%08x (=%u)",
823 ident,
824 EXTRACT_32BITS(tptr),
825 EXTRACT_32BITS(tptr));
826 tptr+=4;
827 subl-=4;
828 }
829 break;
830 case SUBTLV_IP_REACH_ADMIN_TAG64:
831 while (subl >= 8) {
832 if (!TTEST2(*tptr,8))
833 goto trunctlv;
834 printf("%s64-Bit Administrative tag: 0x%08x%08x",
835 ident,
836 EXTRACT_32BITS(tptr),
837 EXTRACT_32BITS(tptr+4));
838 tptr+=8;
839 subl-=8;
840 }
841 break;
842 default:
843 printf("%sunknown subTLV, type %d, length %d",
844 ident,
845 subt,
846 subl);
847 if(!print_unknown_data(tptr,"\n\t\t ",
848 subl))
849 return(0);
850 break;
851 }
852 return(1);
853
854 trunctlv:
855 printf("%spacket exceeded snapshot",ident);
856 return(0);
857 }
858
859 /*
860 * this is the common IS-REACH subTLV decoder it is called
861 * from isis_print_ext_is_reach()
862 */
863
864 static int
865 isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) {
866
867 int i;
868 union { /* int to float conversion buffer for several subTLVs */
869 float f;
870 u_int32_t i;
871 } bw;
872
873 switch(subt) {
874 case SUBTLV_EXT_IS_REACH_ADMIN_GROUP:
875 if (!TTEST2(*tptr,4))
876 goto trunctlv;
877 printf("%sAdministrative groups: 0x%08x",
878 ident,
879 EXTRACT_32BITS(tptr));
880 break;
881 case SUBTLV_EXT_IS_REACH_LINK_LOCAL_ID:
882 if (!TTEST2(*tptr,4))
883 goto trunctlv;
884 printf("%sLink Local Identifier: 0x%08x",
885 ident,
886 EXTRACT_32BITS(tptr));
887 break;
888 case SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
889 if (!TTEST2(*tptr,4))
890 goto trunctlv;
891 printf("%sLink Remote Identifier: 0x%08x",
892 ident,
893 EXTRACT_32BITS(tptr));
894 break;
895 case SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
896 if (!TTEST2(*tptr,4))
897 goto trunctlv;
898 bw.i = EXTRACT_32BITS(tptr);
899 printf("%sMaximum link bandwidth : %.3f Mbps",
900 ident,
901 bw.f*8/1000000 );
902 break;
903 case SUBTLV_EXT_IS_REACH_RESERVABLE_BW :
904 if (!TTEST2(*tptr,4))
905 goto trunctlv;
906 bw.i = EXTRACT_32BITS(tptr);
907 printf("%sReservable link bandwidth: %.3f Mbps",
908 ident,
909 bw.f*8/1000000 );
910 break;
911 case SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
912 printf("%sUnreserved bandwidth:",ident);
913 for (i = 0; i < 8; i++) {
914 if (!TTEST2(*(tptr+i*4),4))
915 goto trunctlv;
916 bw.i = EXTRACT_32BITS(tptr);
917 printf("%s priority level %d: %.3f Mbps",
918 ident,
919 i,
920 bw.f*8/1000000 );
921 }
922 break;
923 case SUBTLV_EXT_IS_REACH_TE_METRIC:
924 if (!TTEST2(*tptr,3))
925 goto trunctlv;
926 printf("%sTraffic Engineering Metric: %d",
927 ident,
928 EXTRACT_24BITS(tptr));
929 break;
930 case SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
931 if (!TTEST2(*tptr,4))
932 goto trunctlv;
933 printf("%sIPv4 interface address: %s",
934 ident,
935 ipaddr_string(tptr));
936 break;
937 case SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
938 if (!TTEST2(*tptr,4))
939 goto trunctlv;
940 printf("%sIPv4 neighbor address: %s",
941 ident,
942 ipaddr_string(tptr));
943 break;
944 case SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
945 if (!TTEST2(*tptr,2))
946 goto trunctlv;
947 printf("%sLink Protection Type: %s, Priority %u",
948 ident,
949 bittok2str(isis_gmpls_link_prot_values, "none", *tptr),
950 *(tptr+1));
951 break;
952 case SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
953 printf("%sInterface Switching Capability",ident);
954
955 if (!TTEST2(*tptr,1))
956 goto trunctlv;
957 printf("%s Interface Switching Capability:%s",
958 ident,
959 tok2str(isis_gmpls_sw_cap_values, "Unknown", *(tptr)));
960
961 if (!TTEST2(*(tptr+1),1))
962 goto trunctlv;
963 printf(", LSP Encoding: %s",
964 tok2str(isis_gmpls_lsp_enc_values, "Unknown", *(tptr+1)));
965
966 if (!TTEST2(*(tptr+2),2)) /* skip 2 res. bytes */
967 goto trunctlv;
968
969 printf("%s Max LSP Bandwidth:",ident);
970 for (i = 0; i < 8; i++) {
971 if (!TTEST2(*(tptr+(i*4)+4),4))
972 goto trunctlv;
973 bw.i = EXTRACT_32BITS(tptr);
974 printf("%s priority level %d: %.3f Mbps",
975 ident,
976 i,
977 bw.f*8/1000000 );
978 }
979 subl-=36;
980 /* there is some optional stuff left to decode but this is as of yet
981 not specified so just lets hexdump what is left */
982 if(subl>0){
983 if(!print_unknown_data(tptr,"\n\t\t ",
984 subl-36))
985 return(0);
986 }
987 break;
988 case 250:
989 case 251:
990 case 252:
991 case 253:
992 case 254:
993 printf("%sReserved for cisco specific extensions, type %d, length %d",
994 ident,
995 subt,
996 subl);
997 break;
998 case 255:
999 printf("%sReserved for future expansion, type %d, length %d",
1000 ident,
1001 subt,
1002 subl);
1003 break;
1004 default:
1005 printf("%sunknown subTLV, type %d, length %d",
1006 ident,
1007 subt,
1008 subl);
1009 if(!print_unknown_data(tptr,"\n\t\t ",
1010 subl))
1011 return(0);
1012 break;
1013 }
1014 return(1);
1015
1016 trunctlv:
1017 printf("%spacket exceeded snapshot",ident);
1018 return(0);
1019 }
1020
1021
1022 /*
1023 * this is the common IS-REACH decoder it is called
1024 * from various EXTD-IS REACH style TLVs (22,24,222)
1025 */
1026
1027 static int
1028 isis_print_ext_is_reach (const u_int8_t *tptr,const char *ident, int tlv) {
1029
1030 char ident_buffer[20];
1031 int subt,subl,tslen;
1032 int proc_bytes = 0; /* how many bytes did we process ? */
1033
1034 if (!TTEST2(*tptr, NODE_ID_LEN))
1035 return(0);
1036
1037 printf("%sIS Neighbor: %s", ident, isis_print_id(tptr, NODE_ID_LEN));
1038 tptr+=(NODE_ID_LEN);
1039
1040 if (tlv != TLV_IS_ALIAS_ID) {
1041 if (!TTEST2(*tptr, 3))
1042 return(0);
1043 printf(", Metric: %d",EXTRACT_24BITS(tptr));
1044 tptr+=3;
1045 }
1046
1047 if (!TTEST2(*tptr, 1))
1048 return(0);
1049 tslen=*(tptr++); /* read out subTLV length */
1050 proc_bytes=NODE_ID_LEN+3+1;
1051 printf(", %ssub-TLVs present",tslen ? "" : "no ");
1052 if (tslen) {
1053 printf(" (%u)",tslen);
1054 while (tslen>0) {
1055 if (!TTEST2(*tptr,2))
1056 return(0);
1057 subt=*(tptr++);
1058 subl=*(tptr++);
1059 /* prepend the ident string */
1060 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident);
1061 if(!isis_print_is_reach_subtlv(tptr,subt,subl,ident_buffer))
1062 return(0);
1063 tptr+=subl;
1064 tslen-=(subl+2);
1065 proc_bytes+=(subl+2);
1066 }
1067 }
1068 return(proc_bytes);
1069 }
1070
1071 /*
1072 * this is the common Multi Topology ID decoder
1073 * it is called from various MT-TLVs (222,229,235,237)
1074 */
1075
1076 static int
1077 isis_print_mtid (const u_int8_t *tptr,const char *ident) {
1078
1079 if (!TTEST2(*tptr, 2))
1080 return(0);
1081
1082 printf("%s%s",
1083 ident,
1084 tok2str(isis_mt_values,
1085 "Reserved for IETF Consensus",
1086 ISIS_MASK_MTID(EXTRACT_16BITS(tptr))));
1087
1088 printf(" Topology (0x%03x), Flags: [%s]",
1089 ISIS_MASK_MTID(EXTRACT_16BITS(tptr)),
1090 bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(EXTRACT_16BITS(tptr))));
1091
1092 return(2);
1093 }
1094
1095 /*
1096 * this is the common extended IP reach decoder
1097 * it is called from TLVs (135,235,236,237)
1098 * we process the TLV and optional subTLVs and return
1099 * the amount of processed bytes
1100 */
1101
1102 static int
1103 isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi) {
1104
1105 char ident_buffer[20];
1106 u_int8_t prefix[16]; /* shared copy buffer for IPv4 and IPv6 prefixes */
1107 u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen;
1108
1109 if (!TTEST2(*tptr, 4))
1110 return (0);
1111 metric = EXTRACT_32BITS(tptr);
1112 processed=4;
1113 tptr+=4;
1114
1115 if (afi == IPV4) {
1116 if (!TTEST2(*tptr, 1)) /* fetch status byte */
1117 return (0);
1118 status_byte=*(tptr++);
1119 bit_length = status_byte&0x3f;
1120 processed++;
1121 #ifdef INET6
1122 } else if (afi == IPV6) {
1123 if (!TTEST2(*tptr, 1)) /* fetch status & prefix_len byte */
1124 return (0);
1125 status_byte=*(tptr++);
1126 bit_length=*(tptr++);
1127 processed+=2;
1128 #endif
1129 } else
1130 return (0); /* somebody is fooling us */
1131
1132 byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
1133
1134 if (!TTEST2(*tptr, byte_length))
1135 return (0);
1136 memset(prefix, 0, 16); /* clear the copy buffer */
1137 memcpy(prefix,tptr,byte_length); /* copy as much as is stored in the TLV */
1138 tptr+=byte_length;
1139 processed+=byte_length;
1140
1141 if (afi == IPV4)
1142 printf("%sIPv4 prefix: %15s/%u",
1143 ident,
1144 ipaddr_string(prefix),
1145 bit_length);
1146 #ifdef INET6
1147 if (afi == IPV6)
1148 printf("%sIPv6 prefix: %s/%u",
1149 ident,
1150 ip6addr_string(prefix),
1151 bit_length);
1152 #endif
1153
1154 printf(", Distribution: %s, Metric: %u",
1155 ISIS_MASK_TLV_EXT_IP_UPDOWN(status_byte) ? "down" : "up",
1156 metric);
1157
1158 if (afi == IPV4 && ISIS_MASK_TLV_EXT_IP_SUBTLV(status_byte))
1159 printf(", sub-TLVs present");
1160 #ifdef INET6
1161 if (afi == IPV6)
1162 printf(", %s%s",
1163 ISIS_MASK_TLV_EXT_IP6_IE(status_byte) ? "External" : "Internal",
1164 ISIS_MASK_TLV_EXT_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : "");
1165 #endif
1166
1167 if ((ISIS_MASK_TLV_EXT_IP_SUBTLV(status_byte) && afi == IPV4) ||
1168 (ISIS_MASK_TLV_EXT_IP6_SUBTLV(status_byte) && afi == IPV6)) {
1169 /* assume that one prefix can hold more
1170 than one subTLV - therefore the first byte must reflect
1171 the aggregate bytecount of the subTLVs for this prefix
1172 */
1173 if (!TTEST2(*tptr, 1))
1174 return (0);
1175 sublen=*(tptr++);
1176 processed+=sublen+1;
1177 printf(" (%u)",sublen); /* print out subTLV length */
1178
1179 while (sublen>0) {
1180 if (!TTEST2(*tptr,2))
1181 return (0);
1182 subtlvtype=*(tptr++);
1183 subtlvlen=*(tptr++);
1184 /* prepend the ident string */
1185 snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident);
1186 if(!isis_print_ip_reach_subtlv(tptr,subtlvtype,subtlvlen,ident_buffer))
1187 return(0);
1188 tptr+=subtlvlen;
1189 sublen-=(subtlvlen+2);
1190 }
1191 }
1192 return (processed);
1193 }
1194
1195 /*
1196 * isis_print
1197 * Decode IS-IS packets. Return 0 on error.
1198 */
1199
1200 static int isis_print (const u_int8_t *p, u_int length)
1201 {
1202 const struct isis_common_header *header;
1203
1204 const struct isis_iih_lan_header *header_iih_lan;
1205 const struct isis_iih_ptp_header *header_iih_ptp;
1206 const struct isis_lsp_header *header_lsp;
1207 const struct isis_csnp_header *header_csnp;
1208 const struct isis_psnp_header *header_psnp;
1209
1210 const struct isis_tlv_lsp *tlv_lsp;
1211 const struct isis_tlv_ptp_adj *tlv_ptp_adj;
1212 const struct isis_tlv_is_reach *tlv_is_reach;
1213 const struct isis_tlv_es_reach *tlv_es_reach;
1214
1215 u_int8_t pdu_type, max_area, id_length, tlv_type, tlv_len, tmp, alen, lan_alen, prefix_len;
1216 u_int8_t ext_is_len, ext_ip_len, mt_len;
1217 const u_int8_t *optr, *pptr, *tptr;
1218 u_short packet_len,pdu_len,time_remain;
1219 u_int i,ra,rr;
1220
1221 packet_len=length;
1222 optr = p; /* initialize the _o_riginal pointer to the packet start -
1223 need it for parsing the checksum TLV */
1224 header = (const struct isis_common_header *)p;
1225 TCHECK(*header);
1226 pptr = p+(ISIS_COMMON_HEADER_SIZE);
1227 header_iih_lan = (const struct isis_iih_lan_header *)pptr;
1228 header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
1229 header_lsp = (const struct isis_lsp_header *)pptr;
1230 header_csnp = (const struct isis_csnp_header *)pptr;
1231 header_psnp = (const struct isis_psnp_header *)pptr;
1232
1233 /*
1234 * Sanity checking of the header.
1235 */
1236
1237 if (header->version != ISIS_VERSION) {
1238 printf(", version %d packet not supported", header->version);
1239 return (0);
1240 }
1241
1242 if ((header->id_length != SYSTEM_ID_LEN) && (header->id_length != 0)) {
1243 printf(", system ID length of %d is not supported",
1244 header->id_length);
1245 return (0);
1246 }
1247
1248 if (header->pdu_version != ISIS_VERSION) {
1249 printf(", version %d packet not supported", header->pdu_version);
1250 return (0);
1251 }
1252
1253 max_area = header->max_area;
1254 switch(max_area) {
1255 case 0:
1256 max_area = 3; /* silly shit */
1257 break;
1258 case 255:
1259 printf(", bad packet -- 255 areas");
1260 return (0);
1261 default:
1262 break;
1263 }
1264
1265 id_length = header->id_length;
1266 switch(id_length) {
1267 case 0:
1268 id_length = 6; /* silly shit again */
1269 break;
1270 case 1: /* 1-8 are valid sys-ID lenghts */
1271 case 2:
1272 case 3:
1273 case 4:
1274 case 5:
1275 case 6:
1276 case 7:
1277 case 8:
1278 break;
1279 case 255:
1280 id_length = 0; /* entirely useless */
1281 break;
1282 default:
1283 break;
1284 }
1285
1286 /* toss any non 6-byte sys-ID len PDUs */
1287 if (id_length != 6 ) {
1288 printf(", bad packet -- illegal sys-ID length (%u)", id_length);
1289 return (0);
1290 }
1291
1292 pdu_type=header->pdu_type;
1293
1294 /* in non-verbose mode just lets print the basic PDU Type*/
1295 if (vflag < 1) {
1296 printf("IS-IS, %s, length: %u",
1297 tok2str(isis_pdu_values,"unknown PDU-Type %u",pdu_type),
1298 length);
1299 return(1);
1300 }
1301
1302 /* ok they seem to want to know everything - lets fully decode it */
1303 printf("IS-IS, length: %u",length);
1304
1305 printf("\n\thlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)",
1306 header->fixed_len,
1307 header->version,
1308 header->pdu_version,
1309 id_length,
1310 header->id_length,
1311 max_area,
1312 header->max_area);
1313
1314 /* first lets see if we know the PDU name*/
1315 printf(", pdu-type: %s",
1316 tok2str(isis_pdu_values,
1317 "unknown, type %u",
1318 pdu_type));
1319
1320 if (vflag > 1) {
1321 if(!print_unknown_data(optr,"\n\t",8)) /* provide the _o_riginal pointer */
1322 return(0); /* for optionally debugging the common header */
1323 }
1324
1325 switch (pdu_type) {
1326
1327 case L1_LAN_IIH:
1328 case L2_LAN_IIH:
1329 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) {
1330 printf(", bogus fixed header length %u should be %lu",
1331 header->fixed_len, (unsigned long)ISIS_IIH_LAN_HEADER_SIZE);
1332 return (0);
1333 }
1334
1335 pdu_len=EXTRACT_16BITS(header_iih_lan->pdu_len);
1336 if (packet_len>pdu_len) {
1337 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1338 length=pdu_len;
1339 }
1340
1341 TCHECK(*header_iih_lan);
1342 printf("\n\t source-id: %s, holding time: %us, Flags: [%s]",
1343 isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN),
1344 EXTRACT_16BITS(header_iih_lan->holding_time),
1345 tok2str(isis_iih_circuit_type_values,
1346 "unknown circuit type 0x%02x",
1347 header_iih_lan->circuit_type));
1348
1349 printf("\n\t lan-id: %s, Priority: %u, PDU length: %u",
1350 isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN),
1351 (header_iih_lan->priority) & PRIORITY_MASK,
1352 pdu_len);
1353
1354 if (vflag > 1) {
1355 if(!print_unknown_data(pptr,"\n\t ",ISIS_IIH_LAN_HEADER_SIZE))
1356 return(0);
1357 }
1358
1359 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
1360 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
1361 break;
1362
1363 case PTP_IIH:
1364 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) {
1365 printf(", bogus fixed header length %u should be %lu",
1366 header->fixed_len, (unsigned long)ISIS_IIH_PTP_HEADER_SIZE);
1367 return (0);
1368 }
1369
1370 pdu_len=EXTRACT_16BITS(header_iih_ptp->pdu_len);
1371 if (packet_len>pdu_len) {
1372 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1373 length=pdu_len;
1374 }
1375
1376 TCHECK(*header_iih_ptp);
1377 printf("\n\t source-id: %s, holding time: %us, circuit-id: 0x%02x, %s, PDU length: %u",
1378 isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN),
1379 EXTRACT_16BITS(header_iih_ptp->holding_time),
1380 header_iih_ptp->circuit_id,
1381 tok2str(isis_iih_circuit_type_values,
1382 "unknown circuit type 0x%02x",
1383 header_iih_ptp->circuit_type),
1384 pdu_len);
1385
1386 if (vflag > 1) {
1387 if(!print_unknown_data(pptr,"\n\t ",ISIS_IIH_PTP_HEADER_SIZE))
1388 return(0);
1389 }
1390
1391 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
1392 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
1393 break;
1394
1395 case L1_LSP:
1396 case L2_LSP:
1397 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) {
1398 printf(", bogus fixed header length %u should be %lu",
1399 header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE);
1400 return (0);
1401 }
1402
1403 pdu_len=EXTRACT_16BITS(header_lsp->pdu_len);
1404 if (packet_len>pdu_len) {
1405 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1406 length=pdu_len;
1407 }
1408
1409 TCHECK(*header_lsp);
1410 printf("\n\t lsp-id: %s, seq: 0x%08x, lifetime: %5us",
1411 isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
1412 EXTRACT_32BITS(header_lsp->sequence_number),
1413 EXTRACT_16BITS(header_lsp->remaining_lifetime));
1414 /* verify the checksum -
1415 * checking starts at the lsp-id field
1416 * which is 12 bytes after the packet start*/
1417 printf("\n\t chksum: 0x%04x (%s), PDU length: %u",
1418 EXTRACT_16BITS(header_lsp->checksum),
1419 (osi_cksum(optr+12, length-12)) ? "incorrect" : "correct",
1420 pdu_len);
1421
1422 printf(", %s", ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : "");
1423
1424 if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) {
1425 printf("%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : "");
1426 printf("%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : "");
1427 printf("%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : "");
1428 printf("%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : "");
1429 printf("ATT bit set, ");
1430 }
1431 printf("%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : "");
1432 printf("%s", tok2str(isis_lsp_istype_values,"Unknown(0x%x)",ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)));
1433
1434 if (vflag > 1) {
1435 if(!print_unknown_data(pptr,"\n\t ",ISIS_LSP_HEADER_SIZE))
1436 return(0);
1437 }
1438
1439 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
1440 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
1441 break;
1442
1443 case L1_CSNP:
1444 case L2_CSNP:
1445 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) {
1446 printf(", bogus fixed header length %u should be %lu",
1447 header->fixed_len, (unsigned long)ISIS_CSNP_HEADER_SIZE);
1448 return (0);
1449 }
1450
1451 pdu_len=EXTRACT_16BITS(header_csnp->pdu_len);
1452 if (packet_len>pdu_len) {
1453 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1454 length=pdu_len;
1455 }
1456
1457 TCHECK(*header_csnp);
1458 printf("\n\t source-id: %s, PDU length: %u",
1459 isis_print_id(header_csnp->source_id, NODE_ID_LEN),
1460 pdu_len);
1461 printf("\n\t start lsp-id: %s",
1462 isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN));
1463 printf("\n\t end lsp-id: %s",
1464 isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN));
1465
1466 if (vflag > 1) {
1467 if(!print_unknown_data(pptr,"\n\t ",ISIS_CSNP_HEADER_SIZE))
1468 return(0);
1469 }
1470
1471 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
1472 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
1473 break;
1474
1475 case L1_PSNP:
1476 case L2_PSNP:
1477 if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) {
1478 printf("- bogus fixed header length %u should be %lu",
1479 header->fixed_len, (unsigned long)ISIS_PSNP_HEADER_SIZE);
1480 return (0);
1481 }
1482
1483 pdu_len=EXTRACT_16BITS(header_psnp->pdu_len);
1484 if (packet_len>pdu_len) {
1485 packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
1486 length=pdu_len;
1487 }
1488
1489 TCHECK(*header_psnp);
1490 printf("\n\t source-id: %s",
1491 isis_print_id(header_psnp->source_id, NODE_ID_LEN));
1492
1493 if (vflag > 1) {
1494 if(!print_unknown_data(pptr,"\n\t ",ISIS_PSNP_HEADER_SIZE))
1495 return(0);
1496 }
1497
1498 packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
1499 pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
1500 break;
1501
1502 default:
1503 if(!print_unknown_data(pptr,"\n\t ",length))
1504 return(0);
1505 return (0);
1506 }
1507
1508 /*
1509 * Now print the TLV's.
1510 */
1511
1512 while (packet_len >= 2) {
1513 if (pptr == snapend) {
1514 return (1);
1515 }
1516
1517 if (!TTEST2(*pptr, 2)) {
1518 printf("\n\t\t packet exceeded snapshot (%ld) bytes",
1519 (long)(pptr-snapend));
1520 return (1);
1521 }
1522 tlv_type = *pptr++;
1523 tlv_len = *pptr++;
1524 tmp =tlv_len; /* copy temporary len & pointer to packet data */
1525 tptr = pptr;
1526 packet_len -= 2;
1527 if (tlv_len > packet_len) {
1528 break;
1529 }
1530
1531 /* first lets see if we know the TLVs name*/
1532 printf("\n\t %s TLV #%u, length: %u",
1533 tok2str(isis_tlv_values,
1534 "unknown",
1535 tlv_type),
1536 tlv_type,
1537 tlv_len);
1538
1539 /* now check if we have a decoder otherwise do a hexdump at the end*/
1540 switch (tlv_type) {
1541 case TLV_AREA_ADDR:
1542 if (!TTEST2(*tptr, 1))
1543 goto trunctlv;
1544 alen = *tptr++;
1545 while (tmp && alen < tmp) {
1546 printf("\n\t Area address (length: %u): %s",
1547 alen,
1548 print_nsap(tptr, alen));
1549 tptr += alen;
1550 tmp -= alen + 1;
1551 if (tmp==0) /* if this is the last area address do not attemt a boundary check */
1552 break;
1553 if (!TTEST2(*tptr, 1))
1554 goto trunctlv;
1555 alen = *tptr++;
1556 }
1557 break;
1558 case TLV_ISNEIGH:
1559 while (tmp >= ETHER_ADDR_LEN) {
1560 if (!TTEST2(*tptr, ETHER_ADDR_LEN))
1561 goto trunctlv;
1562 printf("\n\t IS Neighbor: %s",isis_print_id(tptr,ETHER_ADDR_LEN));
1563 tmp -= ETHER_ADDR_LEN;
1564 tptr += ETHER_ADDR_LEN;
1565 }
1566 break;
1567
1568 case TLV_ISNEIGH_VARLEN:
1569 if (!TTEST2(*tptr, 1))
1570 goto trunctlv;
1571 lan_alen = *tptr++; /* LAN adress length */
1572 tmp --;
1573 printf("\n\t LAN address length %u bytes ",lan_alen);
1574 while (tmp >= lan_alen) {
1575 if (!TTEST2(*tptr, lan_alen))
1576 goto trunctlv;
1577 printf("\n\t\tIS Neighbor: %s",isis_print_id(tptr,lan_alen));
1578 tmp -= lan_alen;
1579 tptr +=lan_alen;
1580 }
1581 break;
1582
1583 case TLV_PADDING:
1584 break;
1585
1586 case TLV_MT_IS_REACH:
1587 while (tmp >= 2+NODE_ID_LEN+3+1) {
1588 mt_len = isis_print_mtid(tptr, "\n\t ");
1589 if (mt_len == 0) /* did something go wrong ? */
1590 goto trunctlv;
1591 tptr+=mt_len;
1592 tmp-=mt_len;
1593
1594 ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type);
1595 if (ext_is_len == 0) /* did something go wrong ? */
1596 goto trunctlv;
1597
1598 tmp-=ext_is_len;
1599 tptr+=ext_is_len;
1600 }
1601 break;
1602
1603 case TLV_IS_ALIAS_ID:
1604 while (tmp >= NODE_ID_LEN+1) { /* is it worth attempting a decode ? */
1605 ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type);
1606 if (ext_is_len == 0) /* did something go wrong ? */
1607 goto trunctlv;
1608 tmp-=ext_is_len;
1609 tptr+=ext_is_len;
1610 }
1611 break;
1612
1613 case TLV_EXT_IS_REACH:
1614 while (tmp >= NODE_ID_LEN+3+1) { /* is it worth attempting a decode ? */
1615 ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type);
1616 if (ext_is_len == 0) /* did something go wrong ? */
1617 goto trunctlv;
1618 tmp-=ext_is_len;
1619 tptr+=ext_is_len;
1620 }
1621 break;
1622 case TLV_IS_REACH:
1623 if (!TTEST2(*tptr,1)) /* check if there is one byte left to read out the virtual flag */
1624 goto trunctlv;
1625 printf("\n\t %s",
1626 tok2str(isis_is_reach_virtual_values,
1627 "bogus virtual flag 0x%02x",
1628 *tptr++));
1629 tlv_is_reach = (const struct isis_tlv_is_reach *)tptr;
1630 while (tmp >= sizeof(struct isis_tlv_is_reach)) {
1631 if (!TTEST(*tlv_is_reach))
1632 goto trunctlv;
1633 printf("\n\t IS Neighbor: %s",
1634 isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN));
1635 isis_print_metric_block(&tlv_is_reach->isis_metric_block);
1636 tmp -= sizeof(struct isis_tlv_is_reach);
1637 tlv_is_reach++;
1638 }
1639 break;
1640
1641 case TLV_ESNEIGH:
1642 tlv_es_reach = (const struct isis_tlv_es_reach *)tptr;
1643 while (tmp >= sizeof(struct isis_tlv_es_reach)) {
1644 if (!TTEST(*tlv_es_reach))
1645 goto trunctlv;
1646 printf("\n\t ES Neighbor: %s",
1647 isis_print_id(tlv_es_reach->neighbor_sysid,SYSTEM_ID_LEN));
1648 isis_print_metric_block(&tlv_es_reach->isis_metric_block);
1649 tmp -= sizeof(struct isis_tlv_es_reach);
1650 tlv_es_reach++;
1651 }
1652 break;
1653
1654 /* those two TLVs share the same format */
1655 case TLV_IP_REACH:
1656 case TLV_IP_REACH_EXT:
1657 if (!isis_print_tlv_ip_reach(pptr, "\n\t ", tlv_len))
1658 return (1);
1659 break;
1660
1661 case TLV_EXT_IP_REACH:
1662 while (tmp>0) {
1663 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV4);
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_IP_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 ", IPV4);
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 #ifdef INET6
1688 case TLV_IP6_REACH:
1689 while (tmp>0) {
1690 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6);
1691 if (ext_ip_len == 0) /* did something go wrong ? */
1692 goto trunctlv;
1693 tptr+=ext_ip_len;
1694 tmp-=ext_ip_len;
1695 }
1696 break;
1697
1698 case TLV_MT_IP6_REACH:
1699 while (tmp>0) {
1700 mt_len = isis_print_mtid(tptr, "\n\t ");
1701 if (mt_len == 0) /* did something go wrong ? */
1702 goto trunctlv;
1703 tptr+=mt_len;
1704 tmp-=mt_len;
1705
1706 ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", IPV6);
1707 if (ext_ip_len == 0) /* did something go wrong ? */
1708 goto trunctlv;
1709 tptr+=ext_ip_len;
1710 tmp-=ext_ip_len;
1711 }
1712 break;
1713
1714 case TLV_IP6ADDR:
1715 while (tmp>0) {
1716 if (!TTEST2(*tptr, 16))
1717 goto trunctlv;
1718
1719 printf("\n\t IPv6 interface address: %s",
1720 ip6addr_string(tptr));
1721
1722 tptr += 16;
1723 tmp -= 16;
1724 }
1725 break;
1726 #endif
1727 case TLV_AUTH:
1728 if (!TTEST2(*tptr, 1))
1729 goto trunctlv;
1730
1731 printf("\n\t %s: ",
1732 tok2str(isis_subtlv_auth_values,
1733 "unknown Authentication type 0x%02x",
1734 *tptr));
1735
1736 switch (*tptr) {
1737 case SUBTLV_AUTH_SIMPLE:
1738 for(i=1;i<tlv_len;i++) {
1739 if (!TTEST2(*(tptr+i), 1))
1740 goto trunctlv;
1741 printf("%c",*(tptr+i));
1742 }
1743 break;
1744 case SUBTLV_AUTH_MD5:
1745 for(i=1;i<tlv_len;i++) {
1746 if (!TTEST2(*(tptr+i), 1))
1747 goto trunctlv;
1748 printf("%02x",*(tptr+i));
1749 }
1750 if (tlv_len != SUBTLV_AUTH_MD5_LEN+1)
1751 printf(", (malformed subTLV) ");
1752 break;
1753 case SUBTLV_AUTH_PRIVATE:
1754 default:
1755 if(!print_unknown_data(tptr+1,"\n\t\t ",tlv_len-1))
1756 return(0);
1757 break;
1758 }
1759 break;
1760
1761 case TLV_PTP_ADJ:
1762 tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr;
1763 if(tmp>=1) {
1764 if (!TTEST2(*tptr, 1))
1765 goto trunctlv;
1766 printf("\n\t Adjacency State: %s",
1767 tok2str(isis_ptp_adjancey_values, "0x%02x", *tptr));
1768 tmp--;
1769 }
1770 if(tmp>sizeof(tlv_ptp_adj->extd_local_circuit_id)) {
1771 if (!TTEST2(tlv_ptp_adj->extd_local_circuit_id,
1772 sizeof(tlv_ptp_adj->extd_local_circuit_id)))
1773 goto trunctlv;
1774 printf("\n\t Extended Local circuit ID: 0x%08x",
1775 EXTRACT_32BITS(tlv_ptp_adj->extd_local_circuit_id));
1776 tmp-=sizeof(tlv_ptp_adj->extd_local_circuit_id);
1777 }
1778 if(tmp>=SYSTEM_ID_LEN) {
1779 if (!TTEST2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN))
1780 goto trunctlv;
1781 printf("\n\t Neighbor SystemID: %s",
1782 isis_print_id(tlv_ptp_adj->neighbor_sysid,SYSTEM_ID_LEN));
1783 tmp-=SYSTEM_ID_LEN;
1784 }
1785 if(tmp>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) {
1786 if (!TTEST2(tlv_ptp_adj->neighbor_extd_local_circuit_id,
1787 sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)))
1788 goto trunctlv;
1789 printf("\n\t Neighbor Extended Local circuit ID: 0x%08x",
1790 EXTRACT_32BITS(tlv_ptp_adj->neighbor_extd_local_circuit_id));
1791 }
1792 break;
1793
1794 case TLV_PROTOCOLS:
1795 printf("\n\t NLPID(s): ");
1796 while (tmp>0) {
1797 if (!TTEST2(*(tptr), 1))
1798 goto trunctlv;
1799 printf("%s",
1800 tok2str(osi_nlpid_values,
1801 "Unknown 0x%02x",
1802 *tptr++));
1803 if (tmp>1) /* further NPLIDs ? - put comma */
1804 printf(", ");
1805 tmp--;
1806 }
1807 break;
1808
1809 case TLV_TE_ROUTER_ID:
1810 if (!TTEST2(*pptr, 4))
1811 goto trunctlv;
1812 printf("\n\t Traffic Engineering Router ID: %s", ipaddr_string(pptr));
1813 break;
1814
1815 case TLV_IPADDR:
1816 while (tmp>0) {
1817 if (!TTEST2(*tptr, 4))
1818 goto trunctlv;
1819 printf("\n\t IPv4 interface address: %s", ipaddr_string(tptr));
1820 tptr += 4;
1821 tmp -= 4;
1822 }
1823 break;
1824
1825 case TLV_HOSTNAME:
1826 printf("\n\t Hostname: ");
1827 while (tmp>0) {
1828 if (!TTEST2(*tptr, 1))
1829 goto trunctlv;
1830 printf("%c",*tptr++);
1831 tmp--;
1832 }
1833 break;
1834
1835 case TLV_SHARED_RISK_GROUP:
1836 if (!TTEST2(*tptr, NODE_ID_LEN))
1837 goto trunctlv;
1838 printf("\n\t IS Neighbor: %s", isis_print_id(tptr, NODE_ID_LEN));
1839 tptr+=(NODE_ID_LEN);
1840 tmp-=(NODE_ID_LEN);
1841
1842 if (!TTEST2(*tptr, 1))
1843 goto trunctlv;
1844 printf(", %s", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered");
1845 tmp--;
1846
1847 if (!TTEST2(*tptr,4))
1848 goto trunctlv;
1849 printf("\n\t IPv4 interface address: %s", ipaddr_string(tptr));
1850 tptr+=4;
1851 tmp-=4;
1852
1853 if (!TTEST2(*tptr,4))
1854 goto trunctlv;
1855 printf("\n\t IPv4 neighbor address: %s", ipaddr_string(tptr));
1856 tptr+=4;
1857 tmp-=4;
1858
1859 while (tmp>0) {
1860 if (!TTEST2(*tptr, 4))
1861 goto trunctlv;
1862 printf("\n\t Link-ID: 0x%08x", EXTRACT_32BITS(tptr));
1863 tptr+=4;
1864 tmp-=4;
1865 }
1866 break;
1867
1868 case TLV_LSP:
1869 tlv_lsp = (const struct isis_tlv_lsp *)tptr;
1870 while(tmp>0) {
1871 if (!TTEST((tlv_lsp->lsp_id)[LSP_ID_LEN]))
1872 goto trunctlv;
1873 printf("\n\t lsp-id: %s",
1874 isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN));
1875 if (!TTEST2(tlv_lsp->sequence_number, 4))
1876 goto trunctlv;
1877 printf(", seq: 0x%08x",EXTRACT_32BITS(tlv_lsp->sequence_number));
1878 if (!TTEST2(tlv_lsp->remaining_lifetime, 2))
1879 goto trunctlv;
1880 printf(", lifetime: %5ds",EXTRACT_16BITS(tlv_lsp->remaining_lifetime));
1881 if (!TTEST2(tlv_lsp->checksum, 2))
1882 goto trunctlv;
1883 printf(", chksum: 0x%04x",EXTRACT_16BITS(tlv_lsp->checksum));
1884 tmp-=sizeof(struct isis_tlv_lsp);
1885 tlv_lsp++;
1886 }
1887 break;
1888
1889 case TLV_CHECKSUM:
1890 if (!TTEST2(*tptr, 2))
1891 goto trunctlv;
1892 printf("\n\t checksum: 0x%04x (%s)",
1893 EXTRACT_16BITS(tptr),
1894 (osi_cksum(optr, length)) ? "incorrect" : "correct");
1895 break;
1896
1897 case TLV_MT_SUPPORTED:
1898 while (tmp>1) {
1899 /* length can only be a multiple of 2, otherwise there is
1900 something broken -> so decode down until length is 1 */
1901 if (tmp!=1) {
1902 mt_len = isis_print_mtid(tptr, "\n\t ");
1903 if (mt_len == 0) /* did something go wrong ? */
1904 goto trunctlv;
1905 tptr+=mt_len;
1906 tmp-=mt_len;
1907 } else {
1908 printf("\n\t malformed MT-ID");
1909 break;
1910 }
1911 }
1912 break;
1913
1914 case TLV_RESTART_SIGNALING:
1915 if (!TTEST2(*tptr, 3))
1916 goto trunctlv;
1917 rr = ISIS_MASK_TLV_RESTART_RR(*tptr);
1918 ra = ISIS_MASK_TLV_RESTART_RA(*tptr);
1919 tptr++;
1920 time_remain = EXTRACT_16BITS(tptr);
1921 printf("\n\t Restart Request bit %s, Restart Acknowledgement bit %s\n\t Remaining holding time: %us",
1922 rr ? "set" : "clear", ra ? "set" : "clear", time_remain);
1923 break;
1924
1925 case TLV_IDRP_INFO:
1926 if (!TTEST2(*tptr, 1))
1927 goto trunctlv;
1928 printf("\n\t Inter-Domain Information Type: %s",
1929 tok2str(isis_subtlv_idrp_values,
1930 "Unknown (0x%02x)",
1931 *tptr));
1932 switch (*tptr++) {
1933 case SUBTLV_IDRP_ASN:
1934 if (!TTEST2(*tptr, 2)) /* fetch AS number */
1935 goto trunctlv;
1936 printf("AS Number: %u",EXTRACT_16BITS(tptr));
1937 break;
1938 case SUBTLV_IDRP_LOCAL:
1939 case SUBTLV_IDRP_RES:
1940 default:
1941 if(!print_unknown_data(tptr,"\n\t ",tlv_len-1))
1942 return(0);
1943 break;
1944 }
1945 break;
1946
1947 case TLV_LSP_BUFFERSIZE:
1948 if (!TTEST2(*tptr, 2))
1949 goto trunctlv;
1950 printf("\n\t LSP Buffersize: %u",EXTRACT_16BITS(tptr));
1951 break;
1952
1953 case TLV_PART_DIS:
1954 while (tmp >= SYSTEM_ID_LEN) {
1955 if (!TTEST2(*tptr, SYSTEM_ID_LEN))
1956 goto trunctlv;
1957 printf("\n\t %s",isis_print_id(tptr,SYSTEM_ID_LEN));
1958 tptr+=SYSTEM_ID_LEN;
1959 tmp-=SYSTEM_ID_LEN;
1960 }
1961 break;
1962
1963 case TLV_PREFIX_NEIGH:
1964 if (!TTEST2(*tptr, sizeof(struct isis_metric_block)))
1965 goto trunctlv;
1966 printf("\n\t Metric Block");
1967 isis_print_metric_block((const struct isis_metric_block *)tptr);
1968 tptr+=sizeof(struct isis_metric_block);
1969 tmp-=sizeof(struct isis_metric_block);
1970
1971 while(tmp>0) {
1972 if (!TTEST2(*tptr, 1))
1973 goto trunctlv;
1974 prefix_len=*tptr++; /* read out prefix length in semioctets*/
1975 tmp--;
1976 if (!TTEST2(*tptr, prefix_len/2))
1977 goto trunctlv;
1978 printf("\n\t\tAddress: %s/%u",
1979 print_nsap(tptr,prefix_len/2),
1980 prefix_len*4);
1981 tptr+=prefix_len/2;
1982 tmp-=prefix_len/2;
1983 }
1984 break;
1985
1986 case TLV_IIH_SEQNR:
1987 if (!TTEST2(*tptr, 4)) /* check if four bytes are on the wire */
1988 goto trunctlv;
1989 printf("\n\t Sequence number: %u", EXTRACT_32BITS(tptr) );
1990 break;
1991
1992 case TLV_VENDOR_PRIVATE:
1993 if (!TTEST2(*tptr, 3)) /* check if enough byte for a full oui */
1994 goto trunctlv;
1995 printf("\n\t Vendor OUI Code: 0x%06x", EXTRACT_24BITS(tptr) );
1996 tptr+=3;
1997 tmp-=3;
1998 if (tmp > 0) /* hexdump the rest */
1999 if(!print_unknown_data(tptr,"\n\t\t",tmp))
2000 return(0);
2001 break;
2002 /*
2003 * FIXME those are the defined TLVs that lack a decoder
2004 * you are welcome to contribute code ;-)
2005 */
2006
2007 case TLV_DECNET_PHASE4:
2008 case TLV_LUCENT_PRIVATE:
2009 case TLV_IPAUTH:
2010 case TLV_NORTEL_PRIVATE1:
2011 case TLV_NORTEL_PRIVATE2:
2012
2013 default:
2014 if (vflag <= 1) {
2015 if(!print_unknown_data(pptr,"\n\t\t",tlv_len))
2016 return(0);
2017 }
2018 break;
2019 }
2020 /* do we want to see an additionally hexdump ? */
2021 if (vflag> 1) {
2022 if(!print_unknown_data(pptr,"\n\t ",tlv_len))
2023 return(0);
2024 }
2025
2026 pptr += tlv_len;
2027 packet_len -= tlv_len;
2028 }
2029
2030 if (packet_len != 0) {
2031 printf("\n\t %u straggler bytes", packet_len);
2032 }
2033 return (1);
2034
2035 trunc:
2036 fputs("[|isis]", stdout);
2037 return (1);
2038
2039 trunctlv:
2040 printf("\n\t\t packet exceeded snapshot");
2041 return(1);
2042 }
2043
2044 /*
2045 * Verify the checksum. See 8473-1, Appendix C, section C.4.
2046 */
2047
2048 static int
2049 osi_cksum(const u_int8_t *tptr, u_int len)
2050 {
2051 int32_t c0 = 0, c1 = 0;
2052
2053 while ((int)--len >= 0) {
2054 c0 += *tptr++;
2055 c0 %= 255;
2056 c1 += c0;
2057 c1 %= 255;
2058 }
2059 return (c0 | c1);
2060 }
[mirror] the TCPdump network dissector