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Remove 96 assorted ND_TCHECK calls.
[tcpdump] / print-ospf.c
1 /*
2 * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
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 * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
22 */
23
24 /* \summary: Open Shortest Path First (OSPF) printer */
25
26 #ifdef HAVE_CONFIG_H
27 #include <config.h>
28 #endif
29
30 #include "netdissect-stdinc.h"
31
32 #include "netdissect.h"
33 #include "addrtoname.h"
34 #include "extract.h"
35 #include "gmpls.h"
36
37 #include "ospf.h"
38
39
40 static const struct tok ospf_option_values[] = {
41 { OSPF_OPTION_T, "MultiTopology" }, /* draft-ietf-ospf-mt-09 */
42 { OSPF_OPTION_E, "External" },
43 { OSPF_OPTION_MC, "Multicast" },
44 { OSPF_OPTION_NP, "NSSA" },
45 { OSPF_OPTION_L, "LLS" },
46 { OSPF_OPTION_DC, "Demand Circuit" },
47 { OSPF_OPTION_O, "Opaque" },
48 { OSPF_OPTION_DN, "Up/Down" },
49 { 0, NULL }
50 };
51
52 static const struct tok ospf_authtype_values[] = {
53 { OSPF_AUTH_NONE, "none" },
54 { OSPF_AUTH_SIMPLE, "simple" },
55 { OSPF_AUTH_MD5, "MD5" },
56 { 0, NULL }
57 };
58
59 static const struct tok ospf_rla_flag_values[] = {
60 { RLA_FLAG_B, "ABR" },
61 { RLA_FLAG_E, "ASBR" },
62 { RLA_FLAG_W1, "Virtual" },
63 { RLA_FLAG_W2, "W2" },
64 { 0, NULL }
65 };
66
67 static const struct tok type2str[] = {
68 { OSPF_TYPE_HELLO, "Hello" },
69 { OSPF_TYPE_DD, "Database Description" },
70 { OSPF_TYPE_LS_REQ, "LS-Request" },
71 { OSPF_TYPE_LS_UPDATE, "LS-Update" },
72 { OSPF_TYPE_LS_ACK, "LS-Ack" },
73 { 0, NULL }
74 };
75
76 static const struct tok lsa_values[] = {
77 { LS_TYPE_ROUTER, "Router" },
78 { LS_TYPE_NETWORK, "Network" },
79 { LS_TYPE_SUM_IP, "Summary" },
80 { LS_TYPE_SUM_ABR, "ASBR Summary" },
81 { LS_TYPE_ASE, "External" },
82 { LS_TYPE_GROUP, "Multicast Group" },
83 { LS_TYPE_NSSA, "NSSA" },
84 { LS_TYPE_OPAQUE_LL, "Link Local Opaque" },
85 { LS_TYPE_OPAQUE_AL, "Area Local Opaque" },
86 { LS_TYPE_OPAQUE_DW, "Domain Wide Opaque" },
87 { 0, NULL }
88 };
89
90 static const struct tok ospf_dd_flag_values[] = {
91 { OSPF_DB_INIT, "Init" },
92 { OSPF_DB_MORE, "More" },
93 { OSPF_DB_MASTER, "Master" },
94 { OSPF_DB_RESYNC, "OOBResync" },
95 { 0, NULL }
96 };
97
98 static const struct tok lsa_opaque_values[] = {
99 { LS_OPAQUE_TYPE_TE, "Traffic Engineering" },
100 { LS_OPAQUE_TYPE_GRACE, "Graceful restart" },
101 { LS_OPAQUE_TYPE_RI, "Router Information" },
102 { 0, NULL }
103 };
104
105 static const struct tok lsa_opaque_te_tlv_values[] = {
106 { LS_OPAQUE_TE_TLV_ROUTER, "Router Address" },
107 { LS_OPAQUE_TE_TLV_LINK, "Link" },
108 { 0, NULL }
109 };
110
111 static const struct tok lsa_opaque_te_link_tlv_subtlv_values[] = {
112 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE, "Link Type" },
113 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID, "Link ID" },
114 { LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP, "Local Interface IP address" },
115 { LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP, "Remote Interface IP address" },
116 { LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC, "Traffic Engineering Metric" },
117 { LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW, "Maximum Bandwidth" },
118 { LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW, "Maximum Reservable Bandwidth" },
119 { LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW, "Unreserved Bandwidth" },
120 { LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP, "Administrative Group" },
121 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
122 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE, "Link Protection Type" },
123 { LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR, "Interface Switching Capability" },
124 { LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP, "Shared Risk Link Group" },
125 { LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS, "Bandwidth Constraints" },
126 { 0, NULL }
127 };
128
129 static const struct tok lsa_opaque_grace_tlv_values[] = {
130 { LS_OPAQUE_GRACE_TLV_PERIOD, "Grace Period" },
131 { LS_OPAQUE_GRACE_TLV_REASON, "Graceful restart Reason" },
132 { LS_OPAQUE_GRACE_TLV_INT_ADDRESS, "IPv4 interface address" },
133 { 0, NULL }
134 };
135
136 static const struct tok lsa_opaque_grace_tlv_reason_values[] = {
137 { LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN, "Unknown" },
138 { LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART, "Software Restart" },
139 { LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE, "Software Reload/Upgrade" },
140 { LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH, "Control Processor Switch" },
141 { 0, NULL }
142 };
143
144 static const struct tok lsa_opaque_te_tlv_link_type_sub_tlv_values[] = {
145 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP, "Point-to-point" },
146 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA, "Multi-Access" },
147 { 0, NULL }
148 };
149
150 static const struct tok lsa_opaque_ri_tlv_values[] = {
151 { LS_OPAQUE_RI_TLV_CAP, "Router Capabilities" },
152 { 0, NULL }
153 };
154
155 static const struct tok lsa_opaque_ri_tlv_cap_values[] = {
156 { 1, "Reserved" },
157 { 2, "Reserved" },
158 { 4, "Reserved" },
159 { 8, "Reserved" },
160 { 16, "graceful restart capable" },
161 { 32, "graceful restart helper" },
162 { 64, "Stub router support" },
163 { 128, "Traffic engineering" },
164 { 256, "p2p over LAN" },
165 { 512, "path computation server" },
166 { 0, NULL }
167 };
168
169 static const struct tok ospf_lls_tlv_values[] = {
170 { OSPF_LLS_EO, "Extended Options" },
171 { OSPF_LLS_MD5, "MD5 Authentication" },
172 { 0, NULL }
173 };
174
175 static const struct tok ospf_lls_eo_options[] = {
176 { OSPF_LLS_EO_LR, "LSDB resync" },
177 { OSPF_LLS_EO_RS, "Restart" },
178 { 0, NULL }
179 };
180
181 int
182 ospf_grace_lsa_print(netdissect_options *ndo,
183 const u_char *tptr, u_int ls_length)
184 {
185 u_int tlv_type, tlv_length;
186
187
188 while (ls_length > 0) {
189 ND_TCHECK_4(tptr);
190 if (ls_length < 4) {
191 ND_PRINT("\n\t Remaining LS length %u < 4", ls_length);
192 return -1;
193 }
194 tlv_type = GET_BE_U_2(tptr);
195 tlv_length = GET_BE_U_2(tptr + 2);
196 tptr+=4;
197 ls_length-=4;
198
199 ND_PRINT("\n\t %s TLV (%u), length %u, value: ",
200 tok2str(lsa_opaque_grace_tlv_values,"unknown",tlv_type),
201 tlv_type,
202 tlv_length);
203
204 if (tlv_length > ls_length) {
205 ND_PRINT("\n\t Bogus length %u > %u", tlv_length,
206 ls_length);
207 return -1;
208 }
209
210 /* Infinite loop protection. */
211 if (tlv_type == 0 || tlv_length ==0) {
212 return -1;
213 }
214
215 ND_TCHECK_LEN(tptr, tlv_length);
216 switch(tlv_type) {
217
218 case LS_OPAQUE_GRACE_TLV_PERIOD:
219 if (tlv_length != 4) {
220 ND_PRINT("\n\t Bogus length %u != 4", tlv_length);
221 return -1;
222 }
223 ND_PRINT("%us", GET_BE_U_4(tptr));
224 break;
225
226 case LS_OPAQUE_GRACE_TLV_REASON:
227 if (tlv_length != 1) {
228 ND_PRINT("\n\t Bogus length %u != 1", tlv_length);
229 return -1;
230 }
231 ND_PRINT("%s (%u)",
232 tok2str(lsa_opaque_grace_tlv_reason_values, "Unknown", GET_U_1(tptr)),
233 GET_U_1(tptr));
234 break;
235
236 case LS_OPAQUE_GRACE_TLV_INT_ADDRESS:
237 if (tlv_length != 4) {
238 ND_PRINT("\n\t Bogus length %u != 4", tlv_length);
239 return -1;
240 }
241 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
242 break;
243
244 default:
245 if (ndo->ndo_vflag <= 1) {
246 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
247 return -1;
248 }
249 break;
250
251 }
252 /* in OSPF everything has to be 32-bit aligned, including TLVs */
253 if (tlv_length%4 != 0)
254 tlv_length+=4-(tlv_length%4);
255 ls_length-=tlv_length;
256 tptr+=tlv_length;
257 }
258
259 return 0;
260 trunc:
261 return -1;
262 }
263
264 int
265 ospf_te_lsa_print(netdissect_options *ndo,
266 const u_char *tptr, u_int ls_length)
267 {
268 u_int tlv_type, tlv_length, subtlv_type, subtlv_length;
269 u_int priority_level, te_class, count_srlg;
270 union { /* int to float conversion buffer for several subTLVs */
271 float f;
272 uint32_t i;
273 } bw;
274
275 while (ls_length != 0) {
276 ND_TCHECK_4(tptr);
277 if (ls_length < 4) {
278 ND_PRINT("\n\t Remaining LS length %u < 4", ls_length);
279 return -1;
280 }
281 tlv_type = GET_BE_U_2(tptr);
282 tlv_length = GET_BE_U_2(tptr + 2);
283 tptr+=4;
284 ls_length-=4;
285
286 ND_PRINT("\n\t %s TLV (%u), length: %u",
287 tok2str(lsa_opaque_te_tlv_values,"unknown",tlv_type),
288 tlv_type,
289 tlv_length);
290
291 if (tlv_length > ls_length) {
292 ND_PRINT("\n\t Bogus length %u > %u", tlv_length,
293 ls_length);
294 return -1;
295 }
296
297 /* Infinite loop protection. */
298 if (tlv_type == 0 || tlv_length ==0) {
299 return -1;
300 }
301
302 switch(tlv_type) {
303 case LS_OPAQUE_TE_TLV_LINK:
304 while (tlv_length != 0) {
305 if (tlv_length < 4) {
306 ND_PRINT("\n\t Remaining TLV length %u < 4",
307 tlv_length);
308 return -1;
309 }
310 subtlv_type = GET_BE_U_2(tptr);
311 subtlv_length = GET_BE_U_2(tptr + 2);
312 tptr+=4;
313 tlv_length-=4;
314
315 /* Infinite loop protection */
316 if (subtlv_type == 0 || subtlv_length == 0)
317 goto invalid;
318
319 ND_PRINT("\n\t %s subTLV (%u), length: %u",
320 tok2str(lsa_opaque_te_link_tlv_subtlv_values,"unknown",subtlv_type),
321 subtlv_type,
322 subtlv_length);
323
324 if (tlv_length < subtlv_length) {
325 ND_PRINT("\n\t Remaining TLV length %u < %u",
326 tlv_length + 4, subtlv_length + 4);
327 return -1;
328 }
329 ND_TCHECK_LEN(tptr, subtlv_length);
330 switch(subtlv_type) {
331 case LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP:
332 if (subtlv_length != 4) {
333 ND_PRINT(" != 4");
334 goto invalid;
335 }
336 ND_PRINT(", 0x%08x", GET_BE_U_4(tptr));
337 break;
338 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID:
339 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID:
340 if (subtlv_length != 4 && subtlv_length != 8) {
341 ND_PRINT(" != 4 && != 8");
342 goto invalid;
343 }
344 ND_PRINT(", %s (0x%08x)",
345 GET_IPADDR_STRING(tptr),
346 GET_BE_U_4(tptr));
347 if (subtlv_length == 8) /* rfc4203 */
348 ND_PRINT(", %s (0x%08x)",
349 GET_IPADDR_STRING(tptr+4),
350 GET_BE_U_4(tptr + 4));
351 break;
352 case LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP:
353 case LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP:
354 if (subtlv_length != 4) {
355 ND_PRINT(" != 4");
356 goto invalid;
357 }
358 ND_PRINT(", %s", GET_IPADDR_STRING(tptr));
359 break;
360 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW:
361 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW:
362 if (subtlv_length != 4) {
363 ND_PRINT(" != 4");
364 goto invalid;
365 }
366 bw.i = GET_BE_U_4(tptr);
367 ND_PRINT(", %.3f Mbps", bw.f * 8 / 1000000);
368 break;
369 case LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW:
370 if (subtlv_length != 32) {
371 ND_PRINT(" != 32");
372 goto invalid;
373 }
374 for (te_class = 0; te_class < 8; te_class++) {
375 bw.i = GET_BE_U_4(tptr + te_class * 4);
376 ND_PRINT("\n\t\tTE-Class %u: %.3f Mbps",
377 te_class,
378 bw.f * 8 / 1000000);
379 }
380 break;
381 case LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS:
382 if (subtlv_length < 4) {
383 ND_PRINT(" < 4");
384 goto invalid;
385 }
386 /* BC Model Id (1 octet) + Reserved (3 octets) */
387 ND_PRINT("\n\t\tBandwidth Constraints Model ID: %s (%u)",
388 tok2str(diffserv_te_bc_values, "unknown", GET_U_1(tptr)),
389 GET_U_1(tptr));
390 if (subtlv_length % 4 != 0) {
391 ND_PRINT("\n\t\tlength %u != N x 4", subtlv_length);
392 goto invalid;
393 }
394 if (subtlv_length > 36) {
395 ND_PRINT("\n\t\tlength %u > 36", subtlv_length);
396 goto invalid;
397 }
398 /* decode BCs until the subTLV ends */
399 for (te_class = 0; te_class < (subtlv_length-4)/4; te_class++) {
400 bw.i = GET_BE_U_4(tptr + 4 + te_class * 4);
401 ND_PRINT("\n\t\t Bandwidth constraint CT%u: %.3f Mbps",
402 te_class,
403 bw.f * 8 / 1000000);
404 }
405 break;
406 case LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC:
407 if (subtlv_length != 4) {
408 ND_PRINT(" != 4");
409 goto invalid;
410 }
411 ND_PRINT(", Metric %u", GET_BE_U_4(tptr));
412 break;
413 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE:
414 /* Protection Cap (1 octet) + Reserved ((3 octets) */
415 if (subtlv_length != 4) {
416 ND_PRINT(" != 4");
417 goto invalid;
418 }
419 ND_PRINT(", %s",
420 bittok2str(gmpls_link_prot_values, "none", GET_U_1(tptr)));
421 break;
422 case LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR:
423 if (subtlv_length < 36) {
424 ND_PRINT(" < 36");
425 goto invalid;
426 }
427 /* Switching Cap (1 octet) + Encoding (1) + Reserved (2) */
428 ND_PRINT("\n\t\tInterface Switching Capability: %s",
429 tok2str(gmpls_switch_cap_values, "Unknown", GET_U_1((tptr))));
430 ND_PRINT("\n\t\tLSP Encoding: %s\n\t\tMax LSP Bandwidth:",
431 tok2str(gmpls_encoding_values, "Unknown", GET_U_1((tptr + 1))));
432 for (priority_level = 0; priority_level < 8; priority_level++) {
433 bw.i = GET_BE_U_4(tptr + 4 + (priority_level * 4));
434 ND_PRINT("\n\t\t priority level %u: %.3f Mbps",
435 priority_level,
436 bw.f * 8 / 1000000);
437 }
438 break;
439 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE:
440 if (subtlv_length != 1) {
441 ND_PRINT(" != 1");
442 goto invalid;
443 }
444 ND_PRINT(", %s (%u)",
445 tok2str(lsa_opaque_te_tlv_link_type_sub_tlv_values,"unknown",GET_U_1(tptr)),
446 GET_U_1(tptr));
447 break;
448
449 case LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP:
450 if (subtlv_length % 4 != 0) {
451 ND_PRINT(" != N x 4");
452 goto invalid;
453 }
454 count_srlg = subtlv_length / 4;
455 if (count_srlg != 0)
456 ND_PRINT("\n\t\t Shared risk group: ");
457 while (count_srlg > 0) {
458 bw.i = GET_BE_U_4(tptr);
459 ND_PRINT("%u", bw.i);
460 tptr+=4;
461 count_srlg--;
462 if (count_srlg > 0)
463 ND_PRINT(", ");
464 }
465 break;
466
467 default:
468 if (ndo->ndo_vflag <= 1) {
469 if (!print_unknown_data(ndo, tptr, "\n\t\t", subtlv_length))
470 return -1;
471 }
472 break;
473 }
474 /* in OSPF everything has to be 32-bit aligned, including subTLVs */
475 if (subtlv_length%4 != 0)
476 subtlv_length+=4-(subtlv_length%4);
477
478 if (tlv_length < subtlv_length) {
479 ND_PRINT("\n\t Remaining TLV length %u < %u",
480 tlv_length + 4, subtlv_length + 4);
481 return -1;
482 }
483 tlv_length-=subtlv_length;
484 tptr+=subtlv_length;
485
486 }
487 break;
488
489 case LS_OPAQUE_TE_TLV_ROUTER:
490 if (tlv_length < 4) {
491 ND_PRINT("\n\t TLV length %u < 4", tlv_length);
492 return -1;
493 }
494 ND_TCHECK_4(tptr);
495 ND_PRINT(", %s", GET_IPADDR_STRING(tptr));
496 break;
497
498 default:
499 if (ndo->ndo_vflag <= 1) {
500 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
501 return -1;
502 }
503 break;
504 }
505 /* in OSPF everything has to be 32-bit aligned, including TLVs */
506 if (tlv_length%4 != 0)
507 tlv_length+=4-(tlv_length%4);
508 if (tlv_length > ls_length) {
509 ND_PRINT("\n\t Bogus padded length %u > %u", tlv_length,
510 ls_length);
511 return -1;
512 }
513 ls_length-=tlv_length;
514 tptr+=tlv_length;
515 }
516 return 0;
517 trunc:
518 return -1;
519 invalid:
520 nd_print_invalid(ndo);
521 return -1;
522 }
523
524 static int
525 ospf_print_lshdr(netdissect_options *ndo,
526 const struct lsa_hdr *lshp)
527 {
528 u_int ls_type;
529 u_int ls_length;
530
531 ls_length = GET_BE_U_2(lshp->ls_length);
532 if (ls_length < sizeof(struct lsa_hdr)) {
533 ND_PRINT("\n\t Bogus length %u < header (%zu)", ls_length,
534 sizeof(struct lsa_hdr));
535 return(-1);
536 }
537 ND_PRINT("\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
538 GET_IPADDR_STRING(lshp->ls_router),
539 GET_BE_U_4(lshp->ls_seq),
540 GET_BE_U_2(lshp->ls_age),
541 ls_length - (u_int)sizeof(struct lsa_hdr));
542 ls_type = GET_U_1(lshp->ls_type);
543 switch (ls_type) {
544 /* the LSA header for opaque LSAs was slightly changed */
545 case LS_TYPE_OPAQUE_LL:
546 case LS_TYPE_OPAQUE_AL:
547 case LS_TYPE_OPAQUE_DW:
548 ND_PRINT("\n\t %s LSA (%u), Opaque-Type %s LSA (%u), Opaque-ID %u",
549 tok2str(lsa_values,"unknown",ls_type),
550 ls_type,
551
552 tok2str(lsa_opaque_values,
553 "unknown",
554 GET_U_1(lshp->un_lsa_id.opaque_field.opaque_type)),
555 GET_U_1(lshp->un_lsa_id.opaque_field.opaque_type),
556 GET_BE_U_3(lshp->un_lsa_id.opaque_field.opaque_id)
557
558 );
559 break;
560
561 /* all other LSA types use regular style LSA headers */
562 default:
563 ND_PRINT("\n\t %s LSA (%u), LSA-ID: %s",
564 tok2str(lsa_values,"unknown",ls_type),
565 ls_type,
566 GET_IPADDR_STRING(lshp->un_lsa_id.lsa_id));
567 break;
568 }
569 ND_PRINT("\n\t Options: [%s]",
570 bittok2str(ospf_option_values, "none", GET_U_1(lshp->ls_options)));
571
572 return (ls_length);
573 }
574
575 /* draft-ietf-ospf-mt-09 */
576 static const struct tok ospf_topology_values[] = {
577 { 0, "default" },
578 { 1, "multicast" },
579 { 2, "management" },
580 { 0, NULL }
581 };
582
583 /*
584 * Print all the per-topology metrics.
585 */
586 static int
587 ospf_print_tos_metrics(netdissect_options *ndo,
588 const union un_tos *tos)
589 {
590 u_int metric_count;
591 u_int toscount;
592 u_int tos_type;
593
594 toscount = GET_U_1(tos->link.link_tos_count)+1;
595 metric_count = 0;
596
597 /*
598 * All but the first metric contain a valid topology id.
599 */
600 while (toscount != 0) {
601 ND_TCHECK_SIZE(tos);
602 tos_type = GET_U_1(tos->metrics.tos_type);
603 ND_PRINT("\n\t\ttopology %s (%u), metric %u",
604 tok2str(ospf_topology_values, "Unknown",
605 metric_count ? tos_type : 0),
606 metric_count ? tos_type : 0,
607 GET_BE_U_2(tos->metrics.tos_metric));
608 metric_count++;
609 tos++;
610 toscount--;
611 }
612 return 0;
613 trunc:
614 return 1;
615 }
616
617 /*
618 * Print a single link state advertisement. If truncated or if LSA length
619 * field is less than the length of the LSA header, return NULl, else
620 * return pointer to data past end of LSA.
621 */
622 static const uint8_t *
623 ospf_print_lsa(netdissect_options *ndo,
624 const struct lsa *lsap)
625 {
626 const uint8_t *ls_end;
627 const struct rlalink *rlp;
628 const nd_ipv4 *ap;
629 const struct aslametric *almp;
630 const struct mcla *mcp;
631 const uint8_t *lp;
632 u_int tlv_type, tlv_length, rla_count, topology;
633 int ospf_print_lshdr_ret;
634 u_int ls_length;
635 const uint8_t *tptr;
636
637 tptr = (const uint8_t *)lsap->lsa_un.un_unknown; /* squelch compiler warnings */
638 ospf_print_lshdr_ret = ospf_print_lshdr(ndo, &lsap->ls_hdr);
639 if (ospf_print_lshdr_ret < 0)
640 return(NULL);
641 ls_length = (u_int)ospf_print_lshdr_ret;
642 ls_end = (const uint8_t *)lsap + ls_length;
643 /*
644 * ospf_print_lshdr() returns -1 if the length is too short,
645 * so we know ls_length is >= sizeof(struct lsa_hdr).
646 */
647 ls_length -= sizeof(struct lsa_hdr);
648
649 switch (GET_U_1(lsap->ls_hdr.ls_type)) {
650
651 case LS_TYPE_ROUTER:
652 ND_PRINT("\n\t Router LSA Options: [%s]",
653 bittok2str(ospf_rla_flag_values, "none", GET_U_1(lsap->lsa_un.un_rla.rla_flags)));
654
655 rla_count = GET_BE_U_2(lsap->lsa_un.un_rla.rla_count);
656 ND_TCHECK_SIZE(lsap->lsa_un.un_rla.rla_link);
657 rlp = lsap->lsa_un.un_rla.rla_link;
658 for (u_int i = rla_count; i != 0; i--) {
659 ND_TCHECK_SIZE(rlp);
660 switch (GET_U_1(rlp->un_tos.link.link_type)) {
661
662 case RLA_TYPE_VIRTUAL:
663 ND_PRINT("\n\t Virtual Link: Neighbor Router-ID: %s, Interface Address: %s",
664 GET_IPADDR_STRING(rlp->link_id),
665 GET_IPADDR_STRING(rlp->link_data));
666 break;
667
668 case RLA_TYPE_ROUTER:
669 ND_PRINT("\n\t Neighbor Router-ID: %s, Interface Address: %s",
670 GET_IPADDR_STRING(rlp->link_id),
671 GET_IPADDR_STRING(rlp->link_data));
672 break;
673
674 case RLA_TYPE_TRANSIT:
675 ND_PRINT("\n\t Neighbor Network-ID: %s, Interface Address: %s",
676 GET_IPADDR_STRING(rlp->link_id),
677 GET_IPADDR_STRING(rlp->link_data));
678 break;
679
680 case RLA_TYPE_STUB:
681 ND_PRINT("\n\t Stub Network: %s, Mask: %s",
682 GET_IPADDR_STRING(rlp->link_id),
683 GET_IPADDR_STRING(rlp->link_data));
684 break;
685
686 default:
687 ND_PRINT("\n\t Unknown Router Link Type (%u)",
688 GET_U_1(rlp->un_tos.link.link_type));
689 return (ls_end);
690 }
691
692 if (ospf_print_tos_metrics(ndo, &rlp->un_tos))
693 goto trunc;
694
695 rlp = (const struct rlalink *)((const u_char *)(rlp + 1) +
696 (GET_U_1(rlp->un_tos.link.link_tos_count) * sizeof(union un_tos)));
697 }
698 break;
699
700 case LS_TYPE_NETWORK:
701 ND_TCHECK_4(lsap->lsa_un.un_nla.nla_mask);
702 ND_PRINT("\n\t Mask %s\n\t Connected Routers:",
703 GET_IPADDR_STRING(lsap->lsa_un.un_nla.nla_mask));
704 ap = lsap->lsa_un.un_nla.nla_router;
705 while ((const u_char *)ap < ls_end) {
706 ND_TCHECK_SIZE(ap);
707 ND_PRINT("\n\t %s", GET_IPADDR_STRING(*ap));
708 ++ap;
709 }
710 break;
711
712 case LS_TYPE_SUM_IP:
713 ND_TCHECK_4(lsap->lsa_un.un_nla.nla_mask);
714 ND_PRINT("\n\t Mask %s",
715 GET_IPADDR_STRING(lsap->lsa_un.un_sla.sla_mask));
716 ND_TCHECK_SIZE(lsap->lsa_un.un_sla.sla_tosmetric);
717 lp = (const uint8_t *)lsap->lsa_un.un_sla.sla_tosmetric;
718 while (lp < ls_end) {
719 uint32_t ul;
720
721 ul = GET_BE_U_4(lp);
722 topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
723 ND_PRINT("\n\t\ttopology %s (%u) metric %u",
724 tok2str(ospf_topology_values, "Unknown", topology),
725 topology,
726 ul & SLA_MASK_METRIC);
727 lp += 4;
728 }
729 break;
730
731 case LS_TYPE_SUM_ABR:
732 ND_TCHECK_SIZE(lsap->lsa_un.un_sla.sla_tosmetric);
733 lp = (const uint8_t *)lsap->lsa_un.un_sla.sla_tosmetric;
734 while (lp < ls_end) {
735 uint32_t ul;
736
737 ul = GET_BE_U_4(lp);
738 topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
739 ND_PRINT("\n\t\ttopology %s (%u) metric %u",
740 tok2str(ospf_topology_values, "Unknown", topology),
741 topology,
742 ul & SLA_MASK_METRIC);
743 lp += 4;
744 }
745 break;
746
747 case LS_TYPE_ASE:
748 case LS_TYPE_NSSA: /* fall through - those LSAs share the same format */
749 ND_TCHECK_4(lsap->lsa_un.un_nla.nla_mask);
750 ND_PRINT("\n\t Mask %s",
751 GET_IPADDR_STRING(lsap->lsa_un.un_asla.asla_mask));
752
753 ND_TCHECK_SIZE(lsap->lsa_un.un_sla.sla_tosmetric);
754 almp = lsap->lsa_un.un_asla.asla_metric;
755 while ((const u_char *)almp < ls_end) {
756 uint32_t ul;
757
758 ul = GET_BE_U_4(almp->asla_tosmetric);
759 topology = ((ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS);
760 ND_PRINT("\n\t\ttopology %s (%u), type %u, metric",
761 tok2str(ospf_topology_values, "Unknown", topology),
762 topology,
763 (ul & ASLA_FLAG_EXTERNAL) ? 2 : 1);
764 if ((ul & ASLA_MASK_METRIC) == 0xffffff)
765 ND_PRINT(" infinite");
766 else
767 ND_PRINT(" %u", (ul & ASLA_MASK_METRIC));
768
769 ND_TCHECK_4(almp->asla_forward);
770 if (GET_IPV4_TO_NETWORK_ORDER(almp->asla_forward) != 0) {
771 ND_PRINT(", forward %s", GET_IPADDR_STRING(almp->asla_forward));
772 }
773 ND_TCHECK_4(almp->asla_tag);
774 if (GET_IPV4_TO_NETWORK_ORDER(almp->asla_tag) != 0) {
775 ND_PRINT(", tag %s", GET_IPADDR_STRING(almp->asla_tag));
776 }
777 ++almp;
778 }
779 break;
780
781 case LS_TYPE_GROUP:
782 /* Multicast extensions as of 23 July 1991 */
783 mcp = lsap->lsa_un.un_mcla;
784 while ((const u_char *)mcp < ls_end) {
785 ND_TCHECK_4(mcp->mcla_vid);
786 switch (GET_BE_U_4(mcp->mcla_vtype)) {
787
788 case MCLA_VERTEX_ROUTER:
789 ND_PRINT("\n\t Router Router-ID %s",
790 GET_IPADDR_STRING(mcp->mcla_vid));
791 break;
792
793 case MCLA_VERTEX_NETWORK:
794 ND_PRINT("\n\t Network Designated Router %s",
795 GET_IPADDR_STRING(mcp->mcla_vid));
796 break;
797
798 default:
799 ND_PRINT("\n\t unknown VertexType (%u)",
800 GET_BE_U_4(mcp->mcla_vtype));
801 break;
802 }
803 ++mcp;
804 }
805 break;
806
807 case LS_TYPE_OPAQUE_LL: /* fall through */
808 case LS_TYPE_OPAQUE_AL:
809 case LS_TYPE_OPAQUE_DW:
810
811 switch (GET_U_1(lsap->ls_hdr.un_lsa_id.opaque_field.opaque_type)) {
812 case LS_OPAQUE_TYPE_RI:
813 tptr = (const uint8_t *)(lsap->lsa_un.un_ri_tlv);
814
815 u_int ls_length_remaining = ls_length;
816 while (ls_length_remaining != 0) {
817 ND_TCHECK_4(tptr);
818 if (ls_length_remaining < 4) {
819 ND_PRINT("\n\t Remaining LS length %u < 4", ls_length_remaining);
820 return(ls_end);
821 }
822 tlv_type = GET_BE_U_2(tptr);
823 tlv_length = GET_BE_U_2(tptr + 2);
824 tptr+=4;
825 ls_length_remaining-=4;
826
827 ND_PRINT("\n\t %s TLV (%u), length: %u, value: ",
828 tok2str(lsa_opaque_ri_tlv_values,"unknown",tlv_type),
829 tlv_type,
830 tlv_length);
831
832 if (tlv_length > ls_length_remaining) {
833 ND_PRINT("\n\t Bogus length %u > remaining LS length %u", tlv_length,
834 ls_length_remaining);
835 return(ls_end);
836 }
837 ND_TCHECK_LEN(tptr, tlv_length);
838 switch(tlv_type) {
839
840 case LS_OPAQUE_RI_TLV_CAP:
841 if (tlv_length != 4) {
842 ND_PRINT("\n\t Bogus length %u != 4", tlv_length);
843 return(ls_end);
844 }
845 ND_PRINT("Capabilities: %s",
846 bittok2str(lsa_opaque_ri_tlv_cap_values, "Unknown", GET_BE_U_4(tptr)));
847 break;
848 default:
849 if (ndo->ndo_vflag <= 1) {
850 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
851 return(ls_end);
852 }
853 break;
854
855 }
856 tptr+=tlv_length;
857 ls_length_remaining-=tlv_length;
858 }
859 break;
860
861 case LS_OPAQUE_TYPE_GRACE:
862 if (ospf_grace_lsa_print(ndo, (const u_char *)(lsap->lsa_un.un_grace_tlv),
863 ls_length) == -1) {
864 return(ls_end);
865 }
866 break;
867
868 case LS_OPAQUE_TYPE_TE:
869 if (ospf_te_lsa_print(ndo, (const u_char *)(lsap->lsa_un.un_te_lsa_tlv),
870 ls_length) == -1) {
871 return(ls_end);
872 }
873 break;
874
875 default:
876 if (ndo->ndo_vflag <= 1) {
877 if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
878 "\n\t ", ls_length))
879 return(ls_end);
880 }
881 break;
882 }
883 }
884
885 /* do we want to see an additionally hexdump ? */
886 if (ndo->ndo_vflag> 1)
887 if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
888 "\n\t ", ls_length)) {
889 return(ls_end);
890 }
891
892 return (ls_end);
893 trunc:
894 return (NULL);
895 }
896
897 static int
898 ospf_decode_lls(netdissect_options *ndo,
899 const struct ospfhdr *op, u_int length)
900 {
901 const u_char *dptr;
902 const u_char *dataend;
903 u_int length2;
904 uint16_t lls_type, lls_len;
905 uint32_t lls_flags;
906
907 switch (GET_U_1(op->ospf_type)) {
908
909 case OSPF_TYPE_HELLO:
910 if (!(GET_U_1(op->ospf_hello.hello_options) & OSPF_OPTION_L))
911 return (0);
912 break;
913
914 case OSPF_TYPE_DD:
915 if (!(GET_U_1(op->ospf_db.db_options) & OSPF_OPTION_L))
916 return (0);
917 break;
918
919 default:
920 return (0);
921 }
922
923 /* dig deeper if LLS data is available; see RFC4813 */
924 length2 = GET_BE_U_2(op->ospf_len);
925 dptr = (const u_char *)op + length2;
926 dataend = (const u_char *)op + length;
927
928 if (GET_BE_U_2(op->ospf_authtype) == OSPF_AUTH_MD5) {
929 dptr = dptr + op->ospf_authdata[3];
930 length2 += op->ospf_authdata[3];
931 }
932 if (length2 >= length) {
933 ND_PRINT("\n\t[LLS truncated]");
934 return (1);
935 }
936 ND_PRINT("\n\t LLS: checksum: 0x%04x", (u_int) GET_BE_U_2(dptr));
937
938 dptr += 2;
939 length2 = GET_BE_U_2(dptr);
940 ND_PRINT(", length: %u", length2);
941
942 dptr += 2;
943 while (dptr < dataend) {
944 lls_type = GET_BE_U_2(dptr);
945 ND_PRINT("\n\t %s (%u)",
946 tok2str(ospf_lls_tlv_values,"Unknown TLV",lls_type),
947 lls_type);
948 dptr += 2;
949 lls_len = GET_BE_U_2(dptr);
950 ND_PRINT(", length: %u", lls_len);
951 dptr += 2;
952 switch (lls_type) {
953
954 case OSPF_LLS_EO:
955 if (lls_len != 4) {
956 ND_PRINT(" [should be 4]");
957 lls_len = 4;
958 }
959 lls_flags = GET_BE_U_4(dptr);
960 ND_PRINT("\n\t Options: 0x%08x [%s]", lls_flags,
961 bittok2str(ospf_lls_eo_options, "?", lls_flags));
962
963 break;
964
965 case OSPF_LLS_MD5:
966 if (lls_len != 20) {
967 ND_PRINT(" [should be 20]");
968 lls_len = 20;
969 }
970 ND_PRINT("\n\t Sequence number: 0x%08x", GET_BE_U_4(dptr));
971 break;
972 }
973
974 dptr += lls_len;
975 }
976
977 return (0);
978 }
979
980 static int
981 ospf_decode_v2(netdissect_options *ndo,
982 const struct ospfhdr *op, const u_char *dataend)
983 {
984 const nd_ipv4 *ap;
985 const struct lsr *lsrp;
986 const struct lsa_hdr *lshp;
987 const struct lsa *lsap;
988 uint32_t lsa_count,lsa_count_max;
989
990 switch (GET_U_1(op->ospf_type)) {
991
992 case OSPF_TYPE_HELLO:
993 ND_PRINT("\n\tOptions [%s]",
994 bittok2str(ospf_option_values,"none",GET_U_1(op->ospf_hello.hello_options)));
995
996 ND_PRINT("\n\t Hello Timer %us, Dead Timer %us, Mask %s, Priority %u",
997 GET_BE_U_2(op->ospf_hello.hello_helloint),
998 GET_BE_U_4(op->ospf_hello.hello_deadint),
999 GET_IPADDR_STRING(op->ospf_hello.hello_mask),
1000 GET_U_1(op->ospf_hello.hello_priority));
1001
1002 ND_TCHECK_4(op->ospf_hello.hello_dr);
1003 if (GET_IPV4_TO_NETWORK_ORDER(op->ospf_hello.hello_dr) != 0)
1004 ND_PRINT("\n\t Designated Router %s",
1005 GET_IPADDR_STRING(op->ospf_hello.hello_dr));
1006
1007 ND_TCHECK_4(op->ospf_hello.hello_bdr);
1008 if (GET_IPV4_TO_NETWORK_ORDER(op->ospf_hello.hello_bdr) != 0)
1009 ND_PRINT(", Backup Designated Router %s",
1010 GET_IPADDR_STRING(op->ospf_hello.hello_bdr));
1011
1012 ap = op->ospf_hello.hello_neighbor;
1013 if ((const u_char *)ap < dataend)
1014 ND_PRINT("\n\t Neighbor List:");
1015 while ((const u_char *)ap < dataend) {
1016 ND_TCHECK_SIZE(ap);
1017 ND_PRINT("\n\t %s", GET_IPADDR_STRING(*ap));
1018 ++ap;
1019 }
1020 break; /* HELLO */
1021
1022 case OSPF_TYPE_DD:
1023 ND_PRINT("\n\tOptions [%s]",
1024 bittok2str(ospf_option_values, "none", GET_U_1(op->ospf_db.db_options)));
1025 ND_PRINT(", DD Flags [%s]",
1026 bittok2str(ospf_dd_flag_values, "none", GET_U_1(op->ospf_db.db_flags)));
1027 if (GET_BE_U_2(op->ospf_db.db_ifmtu)) {
1028 ND_PRINT(", MTU: %u",
1029 GET_BE_U_2(op->ospf_db.db_ifmtu));
1030 }
1031 ND_PRINT(", Sequence: 0x%08x", GET_BE_U_4(op->ospf_db.db_seq));
1032
1033 /* Print all the LS adv's */
1034 lshp = op->ospf_db.db_lshdr;
1035 while (((const u_char *)lshp < dataend) && ospf_print_lshdr(ndo, lshp) != -1) {
1036 ++lshp;
1037 }
1038 break;
1039
1040 case OSPF_TYPE_LS_REQ:
1041 lsrp = op->ospf_lsr;
1042 while ((const u_char *)lsrp < dataend) {
1043 ND_TCHECK_SIZE(lsrp);
1044
1045 ND_PRINT("\n\t Advertising Router: %s, %s LSA (%u)",
1046 GET_IPADDR_STRING(lsrp->ls_router),
1047 tok2str(lsa_values,"unknown",GET_BE_U_4(lsrp->ls_type)),
1048 GET_BE_U_4(lsrp->ls_type));
1049
1050 switch (GET_BE_U_4(lsrp->ls_type)) {
1051 /* the LSA header for opaque LSAs was slightly changed */
1052 case LS_TYPE_OPAQUE_LL:
1053 case LS_TYPE_OPAQUE_AL:
1054 case LS_TYPE_OPAQUE_DW:
1055 ND_PRINT(", Opaque-Type: %s LSA (%u), Opaque-ID: %u",
1056 tok2str(lsa_opaque_values, "unknown",GET_U_1(lsrp->un_ls_stateid.opaque_field.opaque_type)),
1057 GET_U_1(lsrp->un_ls_stateid.opaque_field.opaque_type),
1058 GET_BE_U_3(lsrp->un_ls_stateid.opaque_field.opaque_id));
1059 break;
1060 default:
1061 ND_PRINT(", LSA-ID: %s",
1062 GET_IPADDR_STRING(lsrp->un_ls_stateid.ls_stateid));
1063 break;
1064 }
1065
1066 ++lsrp;
1067 }
1068 break;
1069
1070 case OSPF_TYPE_LS_UPDATE:
1071 lsap = op->ospf_lsu.lsu_lsa;
1072 lsa_count_max = GET_BE_U_4(op->ospf_lsu.lsu_count);
1073 ND_PRINT(", %u LSA%s", lsa_count_max, PLURAL_SUFFIX(lsa_count_max));
1074 for (lsa_count=1;lsa_count <= lsa_count_max;lsa_count++) {
1075 ND_PRINT("\n\t LSA #%u", lsa_count);
1076 lsap = (const struct lsa *)ospf_print_lsa(ndo, lsap);
1077 if (lsap == NULL)
1078 goto trunc;
1079 }
1080 break;
1081
1082 case OSPF_TYPE_LS_ACK:
1083 lshp = op->ospf_lsa.lsa_lshdr;
1084 while (ospf_print_lshdr(ndo, lshp) != -1) {
1085 ++lshp;
1086 }
1087 break;
1088
1089 default:
1090 break;
1091 }
1092 return (0);
1093 trunc:
1094 return (1);
1095 }
1096
1097 void
1098 ospf_print(netdissect_options *ndo,
1099 const u_char *bp, u_int length,
1100 const u_char *bp2 _U_)
1101 {
1102 const struct ospfhdr *op;
1103 const u_char *dataend;
1104 const char *cp;
1105
1106 ndo->ndo_protocol = "ospf2";
1107 op = (const struct ospfhdr *)bp;
1108
1109 /* XXX Before we do anything else, strip off the MD5 trailer */
1110 if (GET_BE_U_2(op->ospf_authtype) == OSPF_AUTH_MD5) {
1111 length -= OSPF_AUTH_MD5_LEN;
1112 ndo->ndo_snapend -= OSPF_AUTH_MD5_LEN;
1113 }
1114
1115 /* If the type is valid translate it, or just print the type */
1116 /* value. If it's not valid, say so and return */
1117 cp = tok2str(type2str, "unknown LS-type %u", GET_U_1(op->ospf_type));
1118 ND_PRINT("OSPFv%u, %s, length %u", GET_U_1(op->ospf_version), cp,
1119 length);
1120 if (*cp == 'u')
1121 return;
1122
1123 if (!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
1124 return;
1125 }
1126
1127 if (length != GET_BE_U_2(op->ospf_len)) {
1128 ND_PRINT(" [len %u]", GET_BE_U_2(op->ospf_len));
1129 }
1130
1131 if (length > GET_BE_U_2(op->ospf_len)) {
1132 dataend = bp + GET_BE_U_2(op->ospf_len);
1133 } else {
1134 dataend = bp + length;
1135 }
1136
1137 ND_TCHECK_4(op->ospf_routerid);
1138 ND_PRINT("\n\tRouter-ID %s", GET_IPADDR_STRING(op->ospf_routerid));
1139
1140 ND_TCHECK_4(op->ospf_areaid);
1141 if (GET_IPV4_TO_NETWORK_ORDER(op->ospf_areaid) != 0)
1142 ND_PRINT(", Area %s", GET_IPADDR_STRING(op->ospf_areaid));
1143 else
1144 ND_PRINT(", Backbone Area");
1145
1146 if (ndo->ndo_vflag) {
1147 /* Print authentication data (should we really do this?) */
1148 ND_TCHECK_LEN(op->ospf_authdata, sizeof(op->ospf_authdata));
1149
1150 ND_PRINT(", Authentication Type: %s (%u)",
1151 tok2str(ospf_authtype_values, "unknown", GET_BE_U_2(op->ospf_authtype)),
1152 GET_BE_U_2(op->ospf_authtype));
1153
1154 switch (GET_BE_U_2(op->ospf_authtype)) {
1155
1156 case OSPF_AUTH_NONE:
1157 break;
1158
1159 case OSPF_AUTH_SIMPLE:
1160 ND_PRINT("\n\tSimple text password: ");
1161 (void)nd_printzp(ndo, op->ospf_authdata, OSPF_AUTH_SIMPLE_LEN, NULL);
1162 break;
1163
1164 case OSPF_AUTH_MD5:
1165 ND_PRINT("\n\tKey-ID: %u, Auth-Length: %u, Crypto Sequence Number: 0x%08x",
1166 *((op->ospf_authdata) + 2),
1167 *((op->ospf_authdata) + 3),
1168 GET_BE_U_4((op->ospf_authdata) + 4));
1169 break;
1170
1171 default:
1172 return;
1173 }
1174 }
1175 /* Do rest according to version. */
1176 switch (GET_U_1(op->ospf_version)) {
1177
1178 case 2:
1179 /* ospf version 2 */
1180 if (ospf_decode_v2(ndo, op, dataend))
1181 goto trunc;
1182 if (length > GET_BE_U_2(op->ospf_len)) {
1183 if (ospf_decode_lls(ndo, op, length))
1184 goto trunc;
1185 }
1186 break;
1187
1188 default:
1189 ND_PRINT(" ospf [version %u]", GET_U_1(op->ospf_version));
1190 break;
1191 } /* end switch on version */
1192
1193 return;
1194 trunc:
1195 nd_print_trunc(ndo);
1196 }
[mirror] the TCPdump network dissector