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 #include <sys/cdefs.h>
25 #ifndef lint
26 __RCSID("$NetBSD: print-ospf.c,v 1.11 2024/09/02 16:15:32 christos Exp $");
27 #endif
28
29 /* \summary: Open Shortest Path First (OSPF) printer */
30
31 #include <config.h>
32
33 #include "netdissect-stdinc.h"
34
35 #include "netdissect.h"
36 #include "addrtoname.h"
37 #include "extract.h"
38 #include "gmpls.h"
39
40 #include "ospf.h"
41
42
43 static const struct tok ospf_option_values[] = {
44 { OSPF_OPTION_MT, "MultiTopology" }, /* draft-ietf-ospf-mt-09 */
45 { OSPF_OPTION_E, "External" },
46 { OSPF_OPTION_MC, "Multicast" },
47 { OSPF_OPTION_NP, "NSSA" },
48 { OSPF_OPTION_L, "LLS" },
49 { OSPF_OPTION_DC, "Demand Circuit" },
50 { OSPF_OPTION_O, "Opaque" },
51 { OSPF_OPTION_DN, "Up/Down" },
52 { 0, NULL }
53 };
54
55 static const struct tok ospf_authtype_values[] = {
56 { OSPF_AUTH_NONE, "none" },
57 { OSPF_AUTH_SIMPLE, "simple" },
58 { OSPF_AUTH_MD5, "MD5" },
59 { 0, NULL }
60 };
61
62 static const struct tok ospf_rla_flag_values[] = {
63 { RLA_FLAG_B, "ABR" },
64 { RLA_FLAG_E, "ASBR" },
65 { RLA_FLAG_V, "Virtual" },
66 { RLA_FLAG_W, "Wildcard" },
67 { RLA_FLAG_NT, "Nt" },
68 { RLA_FLAG_H, "Host" },
69 { 0, NULL }
70 };
71
72 static const struct tok type2str[] = {
73 { OSPF_TYPE_HELLO, "Hello" },
74 { OSPF_TYPE_DD, "Database Description" },
75 { OSPF_TYPE_LS_REQ, "LS-Request" },
76 { OSPF_TYPE_LS_UPDATE, "LS-Update" },
77 { OSPF_TYPE_LS_ACK, "LS-Ack" },
78 { 0, NULL }
79 };
80
81 static const struct tok lsa_values[] = {
82 { LS_TYPE_ROUTER, "Router" },
83 { LS_TYPE_NETWORK, "Network" },
84 { LS_TYPE_SUM_IP, "Summary" },
85 { LS_TYPE_SUM_ABR, "ASBR Summary" },
86 { LS_TYPE_ASE, "External" },
87 { LS_TYPE_GROUP, "Multicast Group" },
88 { LS_TYPE_NSSA, "NSSA" },
89 { LS_TYPE_OPAQUE_LL, "Link Local Opaque" },
90 { LS_TYPE_OPAQUE_AL, "Area Local Opaque" },
91 { LS_TYPE_OPAQUE_DW, "Domain Wide Opaque" },
92 { 0, NULL }
93 };
94
95 static const struct tok ospf_dd_flag_values[] = {
96 { OSPF_DB_INIT, "Init" },
97 { OSPF_DB_MORE, "More" },
98 { OSPF_DB_MASTER, "Master" },
99 { OSPF_DB_RESYNC, "OOBResync" },
100 { 0, NULL }
101 };
102
103 static const struct tok lsa_opaque_values[] = {
104 { LS_OPAQUE_TYPE_TE, "Traffic Engineering" },
105 { LS_OPAQUE_TYPE_GRACE, "Graceful restart" },
106 { LS_OPAQUE_TYPE_RI, "Router Information" },
107 { 0, NULL }
108 };
109
110 static const struct tok lsa_opaque_te_tlv_values[] = {
111 { LS_OPAQUE_TE_TLV_ROUTER, "Router Address" },
112 { LS_OPAQUE_TE_TLV_LINK, "Link" },
113 { 0, NULL }
114 };
115
116 static const struct tok lsa_opaque_te_link_tlv_subtlv_values[] = {
117 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE, "Link Type" },
118 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID, "Link ID" },
119 { LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP, "Local Interface IP address" },
120 { LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP, "Remote Interface IP address" },
121 { LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC, "Traffic Engineering Metric" },
122 { LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW, "Maximum Bandwidth" },
123 { LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW, "Maximum Reservable Bandwidth" },
124 { LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW, "Unreserved Bandwidth" },
125 { LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP, "Administrative Group" },
126 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
127 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE, "Link Protection Type" },
128 { LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR, "Interface Switching Capability" },
129 { LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP, "Shared Risk Link Group" },
130 { LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS, "Bandwidth Constraints" },
131 { 0, NULL }
132 };
133
134 static const struct tok lsa_opaque_grace_tlv_values[] = {
135 { LS_OPAQUE_GRACE_TLV_PERIOD, "Grace Period" },
136 { LS_OPAQUE_GRACE_TLV_REASON, "Graceful restart Reason" },
137 { LS_OPAQUE_GRACE_TLV_INT_ADDRESS, "IPv4 interface address" },
138 { 0, NULL }
139 };
140
141 static const struct tok lsa_opaque_grace_tlv_reason_values[] = {
142 { LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN, "Unknown" },
143 { LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART, "Software Restart" },
144 { LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE, "Software Reload/Upgrade" },
145 { LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH, "Control Processor Switch" },
146 { 0, NULL }
147 };
148
149 static const struct tok lsa_opaque_te_tlv_link_type_sub_tlv_values[] = {
150 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP, "Point-to-point" },
151 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA, "Multi-Access" },
152 { 0, NULL }
153 };
154
155 static const struct tok lsa_opaque_ri_tlv_values[] = {
156 { LS_OPAQUE_RI_TLV_CAP, "Router Capabilities" },
157 { 0, NULL }
158 };
159
160 static const struct tok lsa_opaque_ri_tlv_cap_values[] = {
161 { 1, "Reserved" },
162 { 2, "Reserved" },
163 { 4, "Reserved" },
164 { 8, "Reserved" },
165 { 16, "graceful restart capable" },
166 { 32, "graceful restart helper" },
167 { 64, "Stub router support" },
168 { 128, "Traffic engineering" },
169 { 256, "p2p over LAN" },
170 { 512, "path computation server" },
171 { 0, NULL }
172 };
173
174 static const struct tok ospf_lls_tlv_values[] = {
175 { OSPF_LLS_EO, "Extended Options" },
176 { OSPF_LLS_MD5, "MD5 Authentication" },
177 { 0, NULL }
178 };
179
180 static const struct tok ospf_lls_eo_options[] = {
181 { OSPF_LLS_EO_LR, "LSDB resync" },
182 { OSPF_LLS_EO_RS, "Restart" },
183 { 0, NULL }
184 };
185
186 int
ospf_grace_lsa_print(netdissect_options * ndo,const u_char * tptr,u_int ls_length)187 ospf_grace_lsa_print(netdissect_options *ndo,
188 const u_char *tptr, u_int ls_length)
189 {
190 u_int tlv_type, tlv_length;
191
192
193 while (ls_length > 0) {
194 ND_TCHECK_4(tptr);
195 if (ls_length < 4) {
196 ND_PRINT("\n\t Remaining LS length %u < 4", ls_length);
197 return -1;
198 }
199 tlv_type = GET_BE_U_2(tptr);
200 tlv_length = GET_BE_U_2(tptr + 2);
201 tptr+=4;
202 ls_length-=4;
203
204 ND_PRINT("\n\t %s TLV (%u), length %u, value: ",
205 tok2str(lsa_opaque_grace_tlv_values,"unknown",tlv_type),
206 tlv_type,
207 tlv_length);
208
209 if (tlv_length > ls_length) {
210 ND_PRINT("\n\t Bogus length %u > %u", tlv_length,
211 ls_length);
212 return -1;
213 }
214
215 /* Infinite loop protection. */
216 if (tlv_type == 0 || tlv_length ==0) {
217 return -1;
218 }
219
220 ND_TCHECK_LEN(tptr, tlv_length);
221 switch(tlv_type) {
222
223 case LS_OPAQUE_GRACE_TLV_PERIOD:
224 if (tlv_length != 4) {
225 ND_PRINT("\n\t Bogus length %u != 4", tlv_length);
226 return -1;
227 }
228 ND_PRINT("%us", GET_BE_U_4(tptr));
229 break;
230
231 case LS_OPAQUE_GRACE_TLV_REASON:
232 if (tlv_length != 1) {
233 ND_PRINT("\n\t Bogus length %u != 1", tlv_length);
234 return -1;
235 }
236 ND_PRINT("%s (%u)",
237 tok2str(lsa_opaque_grace_tlv_reason_values, "Unknown", GET_U_1(tptr)),
238 GET_U_1(tptr));
239 break;
240
241 case LS_OPAQUE_GRACE_TLV_INT_ADDRESS:
242 if (tlv_length != 4) {
243 ND_PRINT("\n\t Bogus length %u != 4", tlv_length);
244 return -1;
245 }
246 ND_PRINT("%s", GET_IPADDR_STRING(tptr));
247 break;
248
249 default:
250 if (ndo->ndo_vflag <= 1) {
251 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
252 return -1;
253 }
254 break;
255
256 }
257 /* in OSPF everything has to be 32-bit aligned, including TLVs */
258 if (tlv_length%4 != 0)
259 tlv_length+=4-(tlv_length%4);
260 ls_length-=tlv_length;
261 tptr+=tlv_length;
262 }
263
264 return 0;
265 trunc:
266 return -1;
267 }
268
269 int
ospf_te_lsa_print(netdissect_options * ndo,const u_char * tptr,u_int ls_length)270 ospf_te_lsa_print(netdissect_options *ndo,
271 const u_char *tptr, u_int ls_length)
272 {
273 u_int tlv_type, tlv_length, subtlv_type, subtlv_length;
274 u_int priority_level, te_class, count_srlg;
275 union { /* int to float conversion buffer for several subTLVs */
276 float f;
277 uint32_t i;
278 } bw;
279
280 while (ls_length != 0) {
281 ND_TCHECK_4(tptr);
282 if (ls_length < 4) {
283 ND_PRINT("\n\t Remaining LS length %u < 4", ls_length);
284 return -1;
285 }
286 tlv_type = GET_BE_U_2(tptr);
287 tlv_length = GET_BE_U_2(tptr + 2);
288 tptr+=4;
289 ls_length-=4;
290
291 ND_PRINT("\n\t %s TLV (%u), length: %u",
292 tok2str(lsa_opaque_te_tlv_values,"unknown",tlv_type),
293 tlv_type,
294 tlv_length);
295
296 if (tlv_length > ls_length) {
297 ND_PRINT("\n\t Bogus length %u > %u", tlv_length,
298 ls_length);
299 return -1;
300 }
301
302 /* Infinite loop protection. */
303 if (tlv_type == 0 || tlv_length ==0) {
304 return -1;
305 }
306
307 switch(tlv_type) {
308 case LS_OPAQUE_TE_TLV_LINK:
309 while (tlv_length != 0) {
310 if (tlv_length < 4) {
311 ND_PRINT("\n\t Remaining TLV length %u < 4",
312 tlv_length);
313 return -1;
314 }
315 subtlv_type = GET_BE_U_2(tptr);
316 subtlv_length = GET_BE_U_2(tptr + 2);
317 tptr+=4;
318 tlv_length-=4;
319
320 /* Infinite loop protection */
321 if (subtlv_type == 0 || subtlv_length == 0)
322 goto invalid;
323
324 ND_PRINT("\n\t %s subTLV (%u), length: %u",
325 tok2str(lsa_opaque_te_link_tlv_subtlv_values,"unknown",subtlv_type),
326 subtlv_type,
327 subtlv_length);
328
329 if (tlv_length < subtlv_length) {
330 ND_PRINT("\n\t Remaining TLV length %u < %u",
331 tlv_length + 4, subtlv_length + 4);
332 return -1;
333 }
334 ND_TCHECK_LEN(tptr, subtlv_length);
335 switch(subtlv_type) {
336 case LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP:
337 if (subtlv_length != 4) {
338 ND_PRINT(" != 4");
339 goto invalid;
340 }
341 ND_PRINT(", 0x%08x", GET_BE_U_4(tptr));
342 break;
343 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID:
344 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID:
345 if (subtlv_length != 4 && subtlv_length != 8) {
346 ND_PRINT(" != 4 && != 8");
347 goto invalid;
348 }
349 ND_PRINT(", %s (0x%08x)",
350 GET_IPADDR_STRING(tptr),
351 GET_BE_U_4(tptr));
352 if (subtlv_length == 8) /* rfc4203 */
353 ND_PRINT(", %s (0x%08x)",
354 GET_IPADDR_STRING(tptr+4),
355 GET_BE_U_4(tptr + 4));
356 break;
357 case LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP:
358 case LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP:
359 if (subtlv_length != 4) {
360 ND_PRINT(" != 4");
361 goto invalid;
362 }
363 ND_PRINT(", %s", GET_IPADDR_STRING(tptr));
364 break;
365 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW:
366 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW:
367 if (subtlv_length != 4) {
368 ND_PRINT(" != 4");
369 goto invalid;
370 }
371 bw.i = GET_BE_U_4(tptr);
372 ND_PRINT(", %.3f Mbps", bw.f * 8 / 1000000);
373 break;
374 case LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW:
375 if (subtlv_length != 32) {
376 ND_PRINT(" != 32");
377 goto invalid;
378 }
379 for (te_class = 0; te_class < 8; te_class++) {
380 bw.i = GET_BE_U_4(tptr + te_class * 4);
381 ND_PRINT("\n\t\tTE-Class %u: %.3f Mbps",
382 te_class,
383 bw.f * 8 / 1000000);
384 }
385 break;
386 case LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS:
387 if (subtlv_length < 4) {
388 ND_PRINT(" < 4");
389 goto invalid;
390 }
391 /* BC Model Id (1 octet) + Reserved (3 octets) */
392 ND_PRINT("\n\t\tBandwidth Constraints Model ID: %s (%u)",
393 tok2str(diffserv_te_bc_values, "unknown", GET_U_1(tptr)),
394 GET_U_1(tptr));
395 if (subtlv_length % 4 != 0) {
396 ND_PRINT("\n\t\tlength %u != N x 4", subtlv_length);
397 goto invalid;
398 }
399 if (subtlv_length > 36) {
400 ND_PRINT("\n\t\tlength %u > 36", subtlv_length);
401 goto invalid;
402 }
403 /* decode BCs until the subTLV ends */
404 for (te_class = 0; te_class < (subtlv_length-4)/4; te_class++) {
405 bw.i = GET_BE_U_4(tptr + 4 + te_class * 4);
406 ND_PRINT("\n\t\t Bandwidth constraint CT%u: %.3f Mbps",
407 te_class,
408 bw.f * 8 / 1000000);
409 }
410 break;
411 case LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC:
412 if (subtlv_length != 4) {
413 ND_PRINT(" != 4");
414 goto invalid;
415 }
416 ND_PRINT(", Metric %u", GET_BE_U_4(tptr));
417 break;
418 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE:
419 /* Protection Cap (1 octet) + Reserved ((3 octets) */
420 if (subtlv_length != 4) {
421 ND_PRINT(" != 4");
422 goto invalid;
423 }
424 ND_PRINT(", %s",
425 bittok2str(gmpls_link_prot_values, "none", GET_U_1(tptr)));
426 break;
427 case LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR:
428 if (subtlv_length < 36) {
429 ND_PRINT(" < 36");
430 goto invalid;
431 }
432 /* Switching Cap (1 octet) + Encoding (1) + Reserved (2) */
433 ND_PRINT("\n\t\tInterface Switching Capability: %s",
434 tok2str(gmpls_switch_cap_values, "Unknown", GET_U_1((tptr))));
435 ND_PRINT("\n\t\tLSP Encoding: %s\n\t\tMax LSP Bandwidth:",
436 tok2str(gmpls_encoding_values, "Unknown", GET_U_1((tptr + 1))));
437 for (priority_level = 0; priority_level < 8; priority_level++) {
438 bw.i = GET_BE_U_4(tptr + 4 + (priority_level * 4));
439 ND_PRINT("\n\t\t priority level %u: %.3f Mbps",
440 priority_level,
441 bw.f * 8 / 1000000);
442 }
443 break;
444 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE:
445 if (subtlv_length != 1) {
446 ND_PRINT(" != 1");
447 goto invalid;
448 }
449 ND_PRINT(", %s (%u)",
450 tok2str(lsa_opaque_te_tlv_link_type_sub_tlv_values,"unknown",GET_U_1(tptr)),
451 GET_U_1(tptr));
452 break;
453
454 case LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP:
455 if (subtlv_length % 4 != 0) {
456 ND_PRINT(" != N x 4");
457 goto invalid;
458 }
459 count_srlg = subtlv_length / 4;
460 if (count_srlg != 0)
461 ND_PRINT("\n\t\t Shared risk group: ");
462 while (count_srlg > 0) {
463 bw.i = GET_BE_U_4(tptr);
464 ND_PRINT("%u", bw.i);
465 tptr+=4;
466 count_srlg--;
467 if (count_srlg > 0)
468 ND_PRINT(", ");
469 }
470 break;
471
472 default:
473 if (ndo->ndo_vflag <= 1) {
474 if (!print_unknown_data(ndo, tptr, "\n\t\t", subtlv_length))
475 return -1;
476 }
477 break;
478 }
479 /* in OSPF everything has to be 32-bit aligned, including subTLVs */
480 if (subtlv_length%4 != 0)
481 subtlv_length+=4-(subtlv_length%4);
482
483 if (tlv_length < subtlv_length) {
484 ND_PRINT("\n\t Remaining TLV length %u < %u",
485 tlv_length + 4, subtlv_length + 4);
486 return -1;
487 }
488 tlv_length-=subtlv_length;
489 tptr+=subtlv_length;
490
491 }
492 break;
493
494 case LS_OPAQUE_TE_TLV_ROUTER:
495 if (tlv_length < 4) {
496 ND_PRINT("\n\t TLV length %u < 4", tlv_length);
497 return -1;
498 }
499 ND_PRINT(", %s", GET_IPADDR_STRING(tptr));
500 break;
501
502 default:
503 if (ndo->ndo_vflag <= 1) {
504 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
505 return -1;
506 }
507 break;
508 }
509 /* in OSPF everything has to be 32-bit aligned, including TLVs */
510 if (tlv_length%4 != 0)
511 tlv_length+=4-(tlv_length%4);
512 if (tlv_length > ls_length) {
513 ND_PRINT("\n\t Bogus padded length %u > %u", tlv_length,
514 ls_length);
515 return -1;
516 }
517 ls_length-=tlv_length;
518 tptr+=tlv_length;
519 }
520 return 0;
521 trunc:
522 return -1;
523 invalid:
524 nd_print_invalid(ndo);
525 return -1;
526 }
527
528 static int
ospf_print_lshdr(netdissect_options * ndo,const struct lsa_hdr * lshp)529 ospf_print_lshdr(netdissect_options *ndo,
530 const struct lsa_hdr *lshp)
531 {
532 u_int ls_type;
533 u_int ls_length;
534
535 ls_length = GET_BE_U_2(lshp->ls_length);
536 if (ls_length < sizeof(struct lsa_hdr)) {
537 ND_PRINT("\n\t Bogus length %u < header (%zu)", ls_length,
538 sizeof(struct lsa_hdr));
539 return(-1);
540 }
541 ND_PRINT("\n\t Advertising Router %s, seq 0x%08x, age %us, length %zu",
542 GET_IPADDR_STRING(lshp->ls_router),
543 GET_BE_U_4(lshp->ls_seq),
544 GET_BE_U_2(lshp->ls_age),
545 ls_length - sizeof(struct lsa_hdr));
546 ls_type = GET_U_1(lshp->ls_type);
547 switch (ls_type) {
548 /* the LSA header for opaque LSAs was slightly changed */
549 case LS_TYPE_OPAQUE_LL:
550 case LS_TYPE_OPAQUE_AL:
551 case LS_TYPE_OPAQUE_DW:
552 ND_PRINT("\n\t %s LSA (%u), Opaque-Type %s LSA (%u), Opaque-ID %u",
553 tok2str(lsa_values,"unknown",ls_type),
554 ls_type,
555
556 tok2str(lsa_opaque_values,
557 "unknown",
558 GET_U_1(lshp->un_lsa_id.opaque_field.opaque_type)),
559 GET_U_1(lshp->un_lsa_id.opaque_field.opaque_type),
560 GET_BE_U_3(lshp->un_lsa_id.opaque_field.opaque_id)
561
562 );
563 break;
564
565 /* all other LSA types use regular style LSA headers */
566 default:
567 ND_PRINT("\n\t %s LSA (%u), LSA-ID: %s",
568 tok2str(lsa_values,"unknown",ls_type),
569 ls_type,
570 GET_IPADDR_STRING(lshp->un_lsa_id.lsa_id));
571 break;
572 }
573 ND_PRINT("\n\t Options: [%s]",
574 bittok2str(ospf_option_values, "none", GET_U_1(lshp->ls_options)));
575
576 return (ls_length);
577 }
578
579 /* draft-ietf-ospf-mt-09 */
580 static const struct tok ospf_topology_values[] = {
581 { 0, "default" },
582 { 1, "multicast" },
583 { 2, "management" },
584 { 0, NULL }
585 };
586
587 /*
588 * Print all the per-topology metrics.
589 */
590 static void
ospf_print_tos_metrics(netdissect_options * ndo,const union un_tos * tos)591 ospf_print_tos_metrics(netdissect_options *ndo,
592 const union un_tos *tos)
593 {
594 u_int metric_count;
595 u_int toscount;
596 u_int tos_type;
597
598 toscount = GET_U_1(tos->link.link_tos_count)+1;
599 metric_count = 0;
600
601 /*
602 * All but the first metric contain a valid topology id.
603 */
604 while (toscount != 0) {
605 tos_type = GET_U_1(tos->metrics.tos_type);
606 ND_PRINT("\n\t\ttopology %s (%u), metric %u",
607 tok2str(ospf_topology_values, "Unknown",
608 metric_count ? tos_type : 0),
609 metric_count ? tos_type : 0,
610 GET_BE_U_2(tos->metrics.tos_metric));
611 metric_count++;
612 tos++;
613 toscount--;
614 }
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 *
ospf_print_lsa(netdissect_options * ndo,const struct lsa * lsap)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 ospf_print_tos_metrics(ndo, &rlp->un_tos);
693
694 rlp = (const struct rlalink *)((const u_char *)(rlp + 1) +
695 (GET_U_1(rlp->un_tos.link.link_tos_count) * sizeof(union un_tos)));
696 }
697 break;
698
699 case LS_TYPE_NETWORK:
700 ND_PRINT("\n\t Mask %s\n\t Connected Routers:",
701 GET_IPADDR_STRING(lsap->lsa_un.un_nla.nla_mask));
702 ap = lsap->lsa_un.un_nla.nla_router;
703 while ((const u_char *)ap < ls_end) {
704 ND_PRINT("\n\t %s", GET_IPADDR_STRING(ap));
705 ++ap;
706 }
707 break;
708
709 case LS_TYPE_SUM_IP:
710 ND_TCHECK_4(lsap->lsa_un.un_nla.nla_mask);
711 ND_PRINT("\n\t Mask %s",
712 GET_IPADDR_STRING(lsap->lsa_un.un_sla.sla_mask));
713 ND_TCHECK_SIZE(lsap->lsa_un.un_sla.sla_tosmetric);
714 lp = (const uint8_t *)lsap->lsa_un.un_sla.sla_tosmetric;
715 while (lp < ls_end) {
716 uint32_t ul;
717
718 ul = GET_BE_U_4(lp);
719 topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
720 ND_PRINT("\n\t\ttopology %s (%u) metric %u",
721 tok2str(ospf_topology_values, "Unknown", topology),
722 topology,
723 ul & SLA_MASK_METRIC);
724 lp += 4;
725 }
726 break;
727
728 case LS_TYPE_SUM_ABR:
729 ND_TCHECK_SIZE(lsap->lsa_un.un_sla.sla_tosmetric);
730 lp = (const uint8_t *)lsap->lsa_un.un_sla.sla_tosmetric;
731 while (lp < ls_end) {
732 uint32_t ul;
733
734 ul = GET_BE_U_4(lp);
735 topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
736 ND_PRINT("\n\t\ttopology %s (%u) metric %u",
737 tok2str(ospf_topology_values, "Unknown", topology),
738 topology,
739 ul & SLA_MASK_METRIC);
740 lp += 4;
741 }
742 break;
743
744 case LS_TYPE_ASE:
745 case LS_TYPE_NSSA: /* fall through - those LSAs share the same format */
746 ND_TCHECK_4(lsap->lsa_un.un_nla.nla_mask);
747 ND_PRINT("\n\t Mask %s",
748 GET_IPADDR_STRING(lsap->lsa_un.un_asla.asla_mask));
749
750 ND_TCHECK_SIZE(lsap->lsa_un.un_sla.sla_tosmetric);
751 almp = lsap->lsa_un.un_asla.asla_metric;
752 while ((const u_char *)almp < ls_end) {
753 uint32_t ul;
754
755 ul = GET_BE_U_4(almp->asla_tosmetric);
756 topology = ((ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS);
757 ND_PRINT("\n\t\ttopology %s (%u), type %u, metric",
758 tok2str(ospf_topology_values, "Unknown", topology),
759 topology,
760 (ul & ASLA_FLAG_EXTERNAL) ? 2 : 1);
761 if ((ul & ASLA_MASK_METRIC) == 0xffffff)
762 ND_PRINT(" infinite");
763 else
764 ND_PRINT(" %u", (ul & ASLA_MASK_METRIC));
765
766 if (GET_IPV4_TO_NETWORK_ORDER(almp->asla_forward) != 0) {
767 ND_PRINT(", forward %s", GET_IPADDR_STRING(almp->asla_forward));
768 }
769 if (GET_IPV4_TO_NETWORK_ORDER(almp->asla_tag) != 0) {
770 ND_PRINT(", tag %s", GET_IPADDR_STRING(almp->asla_tag));
771 }
772 ++almp;
773 }
774 break;
775
776 case LS_TYPE_GROUP:
777 /* Multicast extensions as of 23 July 1991 */
778 mcp = lsap->lsa_un.un_mcla;
779 while ((const u_char *)mcp < ls_end) {
780 switch (GET_BE_U_4(mcp->mcla_vtype)) {
781
782 case MCLA_VERTEX_ROUTER:
783 ND_PRINT("\n\t Router Router-ID %s",
784 GET_IPADDR_STRING(mcp->mcla_vid));
785 break;
786
787 case MCLA_VERTEX_NETWORK:
788 ND_PRINT("\n\t Network Designated Router %s",
789 GET_IPADDR_STRING(mcp->mcla_vid));
790 break;
791
792 default:
793 ND_PRINT("\n\t unknown VertexType (%u)",
794 GET_BE_U_4(mcp->mcla_vtype));
795 break;
796 }
797 ++mcp;
798 }
799 break;
800
801 case LS_TYPE_OPAQUE_LL: /* fall through */
802 case LS_TYPE_OPAQUE_AL:
803 case LS_TYPE_OPAQUE_DW:
804
805 switch (GET_U_1(lsap->ls_hdr.un_lsa_id.opaque_field.opaque_type)) {
806 case LS_OPAQUE_TYPE_RI:
807 tptr = (const uint8_t *)(lsap->lsa_un.un_ri_tlv);
808
809 u_int ls_length_remaining = ls_length;
810 while (ls_length_remaining != 0) {
811 ND_TCHECK_4(tptr);
812 if (ls_length_remaining < 4) {
813 ND_PRINT("\n\t Remaining LS length %u < 4", ls_length_remaining);
814 return(ls_end);
815 }
816 tlv_type = GET_BE_U_2(tptr);
817 tlv_length = GET_BE_U_2(tptr + 2);
818 tptr+=4;
819 ls_length_remaining-=4;
820
821 ND_PRINT("\n\t %s TLV (%u), length: %u, value: ",
822 tok2str(lsa_opaque_ri_tlv_values,"unknown",tlv_type),
823 tlv_type,
824 tlv_length);
825
826 if (tlv_length > ls_length_remaining) {
827 ND_PRINT("\n\t Bogus length %u > remaining LS length %u", tlv_length,
828 ls_length_remaining);
829 return(ls_end);
830 }
831 ND_TCHECK_LEN(tptr, tlv_length);
832 switch(tlv_type) {
833
834 case LS_OPAQUE_RI_TLV_CAP:
835 if (tlv_length != 4) {
836 ND_PRINT("\n\t Bogus length %u != 4", tlv_length);
837 return(ls_end);
838 }
839 ND_PRINT("Capabilities: %s",
840 bittok2str(lsa_opaque_ri_tlv_cap_values, "Unknown", GET_BE_U_4(tptr)));
841 break;
842 default:
843 if (ndo->ndo_vflag <= 1) {
844 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
845 return(ls_end);
846 }
847 break;
848
849 }
850
851 /* in OSPF everything has to be 32-bit aligned, including TLVs */
852 if (tlv_length % 4) {
853 tlv_length += (4 - (tlv_length % 4));
854 }
855 tptr+=tlv_length;
856 ls_length_remaining-=tlv_length;
857 }
858 break;
859
860 case LS_OPAQUE_TYPE_GRACE:
861 if (ospf_grace_lsa_print(ndo, (const u_char *)(lsap->lsa_un.un_grace_tlv),
862 ls_length) == -1) {
863 return(ls_end);
864 }
865 break;
866
867 case LS_OPAQUE_TYPE_TE:
868 if (ospf_te_lsa_print(ndo, (const u_char *)(lsap->lsa_un.un_te_lsa_tlv),
869 ls_length) == -1) {
870 return(ls_end);
871 }
872 break;
873
874 default:
875 if (ndo->ndo_vflag <= 1) {
876 if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
877 "\n\t ", ls_length))
878 return(ls_end);
879 }
880 break;
881 }
882 }
883
884 /* do we want to see an additionally hexdump ? */
885 if (ndo->ndo_vflag> 1)
886 if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
887 "\n\t ", ls_length)) {
888 return(ls_end);
889 }
890
891 return (ls_end);
892 trunc:
893 return (NULL);
894 }
895
896 static void
ospf_decode_lls(netdissect_options * ndo,const struct ospfhdr * op,u_int length)897 ospf_decode_lls(netdissect_options *ndo,
898 const struct ospfhdr *op, u_int length)
899 {
900 const u_char *dptr;
901 const u_char *dataend;
902 u_int length2;
903 uint16_t lls_type, lls_len;
904 uint32_t lls_flags;
905
906 switch (GET_U_1(op->ospf_type)) {
907
908 case OSPF_TYPE_HELLO:
909 if (!(GET_U_1(op->ospf_hello.hello_options) & OSPF_OPTION_L))
910 return;
911 break;
912
913 case OSPF_TYPE_DD:
914 if (!(GET_U_1(op->ospf_db.db_options) & OSPF_OPTION_L))
915 return;
916 break;
917
918 default:
919 return;
920 }
921
922 /* dig deeper if LLS data is available; see RFC4813 */
923 length2 = GET_BE_U_2(op->ospf_len);
924 dptr = (const u_char *)op + length2;
925 dataend = (const u_char *)op + length;
926
927 if (GET_BE_U_2(op->ospf_authtype) == OSPF_AUTH_MD5) {
928 dptr = dptr + GET_U_1(op->ospf_authdata + 3);
929 length2 += GET_U_1(op->ospf_authdata + 3);
930 }
931 if (length2 >= length) {
932 ND_PRINT("\n\t[LLS truncated]");
933 return;
934 }
935 ND_PRINT("\n\t LLS: checksum: 0x%04x", (u_int) GET_BE_U_2(dptr));
936
937 dptr += 2;
938 length2 = GET_BE_U_2(dptr);
939 ND_PRINT(", length: %u", length2);
940
941 dptr += 2;
942 while (dptr < dataend) {
943 lls_type = GET_BE_U_2(dptr);
944 ND_PRINT("\n\t %s (%u)",
945 tok2str(ospf_lls_tlv_values,"Unknown TLV",lls_type),
946 lls_type);
947 dptr += 2;
948 lls_len = GET_BE_U_2(dptr);
949 ND_PRINT(", length: %u", lls_len);
950 dptr += 2;
951 switch (lls_type) {
952
953 case OSPF_LLS_EO:
954 if (lls_len != 4) {
955 ND_PRINT(" [should be 4]");
956 lls_len = 4;
957 }
958 lls_flags = GET_BE_U_4(dptr);
959 ND_PRINT("\n\t Options: 0x%08x [%s]", lls_flags,
960 bittok2str(ospf_lls_eo_options, "?", lls_flags));
961
962 break;
963
964 case OSPF_LLS_MD5:
965 if (lls_len != 20) {
966 ND_PRINT(" [should be 20]");
967 lls_len = 20;
968 }
969 ND_PRINT("\n\t Sequence number: 0x%08x", GET_BE_U_4(dptr));
970 break;
971 }
972
973 dptr += lls_len;
974 }
975 }
976
977 static int
ospf_decode_v2(netdissect_options * ndo,const struct ospfhdr * op,const u_char * dataend)978 ospf_decode_v2(netdissect_options *ndo,
979 const struct ospfhdr *op, const u_char *dataend)
980 {
981 const nd_ipv4 *ap;
982 const struct lsr *lsrp;
983 const struct lsa_hdr *lshp;
984 const struct lsa *lsap;
985 uint32_t lsa_count,lsa_count_max;
986
987 switch (GET_U_1(op->ospf_type)) {
988
989 case OSPF_TYPE_HELLO:
990 ND_PRINT("\n\tOptions [%s]",
991 bittok2str(ospf_option_values,"none",GET_U_1(op->ospf_hello.hello_options)));
992
993 ND_PRINT("\n\t Hello Timer %us, Dead Timer %us, Mask %s, Priority %u",
994 GET_BE_U_2(op->ospf_hello.hello_helloint),
995 GET_BE_U_4(op->ospf_hello.hello_deadint),
996 GET_IPADDR_STRING(op->ospf_hello.hello_mask),
997 GET_U_1(op->ospf_hello.hello_priority));
998
999 if (GET_IPV4_TO_NETWORK_ORDER(op->ospf_hello.hello_dr) != 0)
1000 ND_PRINT("\n\t Designated Router %s",
1001 GET_IPADDR_STRING(op->ospf_hello.hello_dr));
1002
1003 if (GET_IPV4_TO_NETWORK_ORDER(op->ospf_hello.hello_bdr) != 0)
1004 ND_PRINT(", Backup Designated Router %s",
1005 GET_IPADDR_STRING(op->ospf_hello.hello_bdr));
1006
1007 ap = op->ospf_hello.hello_neighbor;
1008 if ((const u_char *)ap < dataend)
1009 ND_PRINT("\n\t Neighbor List:");
1010 while ((const u_char *)ap < dataend) {
1011 ND_PRINT("\n\t %s", GET_IPADDR_STRING(ap));
1012 ++ap;
1013 }
1014 break; /* HELLO */
1015
1016 case OSPF_TYPE_DD:
1017 ND_PRINT("\n\tOptions [%s]",
1018 bittok2str(ospf_option_values, "none", GET_U_1(op->ospf_db.db_options)));
1019 ND_PRINT(", DD Flags [%s]",
1020 bittok2str(ospf_dd_flag_values, "none", GET_U_1(op->ospf_db.db_flags)));
1021 if (GET_BE_U_2(op->ospf_db.db_ifmtu)) {
1022 ND_PRINT(", MTU: %u",
1023 GET_BE_U_2(op->ospf_db.db_ifmtu));
1024 }
1025 ND_PRINT(", Sequence: 0x%08x", GET_BE_U_4(op->ospf_db.db_seq));
1026
1027 /* Print all the LS adv's */
1028 lshp = op->ospf_db.db_lshdr;
1029 while (((const u_char *)lshp < dataend) && ospf_print_lshdr(ndo, lshp) != -1) {
1030 ++lshp;
1031 }
1032 break;
1033
1034 case OSPF_TYPE_LS_REQ:
1035 lsrp = op->ospf_lsr;
1036 while ((const u_char *)lsrp < dataend) {
1037 ND_TCHECK_SIZE(lsrp);
1038
1039 ND_PRINT("\n\t Advertising Router: %s, %s LSA (%u)",
1040 GET_IPADDR_STRING(lsrp->ls_router),
1041 tok2str(lsa_values,"unknown",GET_BE_U_4(lsrp->ls_type)),
1042 GET_BE_U_4(lsrp->ls_type));
1043
1044 switch (GET_BE_U_4(lsrp->ls_type)) {
1045 /* the LSA header for opaque LSAs was slightly changed */
1046 case LS_TYPE_OPAQUE_LL:
1047 case LS_TYPE_OPAQUE_AL:
1048 case LS_TYPE_OPAQUE_DW:
1049 ND_PRINT(", Opaque-Type: %s LSA (%u), Opaque-ID: %u",
1050 tok2str(lsa_opaque_values, "unknown",GET_U_1(lsrp->un_ls_stateid.opaque_field.opaque_type)),
1051 GET_U_1(lsrp->un_ls_stateid.opaque_field.opaque_type),
1052 GET_BE_U_3(lsrp->un_ls_stateid.opaque_field.opaque_id));
1053 break;
1054 default:
1055 ND_PRINT(", LSA-ID: %s",
1056 GET_IPADDR_STRING(lsrp->un_ls_stateid.ls_stateid));
1057 break;
1058 }
1059
1060 ++lsrp;
1061 }
1062 break;
1063
1064 case OSPF_TYPE_LS_UPDATE:
1065 lsap = op->ospf_lsu.lsu_lsa;
1066 lsa_count_max = GET_BE_U_4(op->ospf_lsu.lsu_count);
1067 ND_PRINT(", %u LSA%s", lsa_count_max, PLURAL_SUFFIX(lsa_count_max));
1068 for (lsa_count=1;lsa_count <= lsa_count_max;lsa_count++) {
1069 ND_PRINT("\n\t LSA #%u", lsa_count);
1070 lsap = (const struct lsa *)ospf_print_lsa(ndo, lsap);
1071 if (lsap == NULL)
1072 goto trunc;
1073 }
1074 break;
1075
1076 case OSPF_TYPE_LS_ACK:
1077 lshp = op->ospf_lsa.lsa_lshdr;
1078 while ((const u_char *)lshp < dataend) {
1079 ospf_print_lshdr(ndo, lshp);
1080 ++lshp;
1081 }
1082 break;
1083
1084 default:
1085 break;
1086 }
1087 return (0);
1088 trunc:
1089 return (1);
1090 }
1091
1092 void
ospf_print(netdissect_options * ndo,const u_char * bp,u_int length,const u_char * bp2 _U_)1093 ospf_print(netdissect_options *ndo,
1094 const u_char *bp, u_int length,
1095 const u_char *bp2 _U_)
1096 {
1097 const struct ospfhdr *op;
1098 const u_char *dataend;
1099 const char *cp;
1100
1101 ndo->ndo_protocol = "ospf2";
1102 op = (const struct ospfhdr *)bp;
1103
1104 /* XXX Before we do anything else, strip off the MD5 trailer */
1105 if (GET_BE_U_2(op->ospf_authtype) == OSPF_AUTH_MD5) {
1106 length -= OSPF_AUTH_MD5_LEN;
1107 ndo->ndo_snapend -= OSPF_AUTH_MD5_LEN;
1108 }
1109
1110 /* If the type is valid translate it, or just print the type */
1111 /* value. If it's not valid, say so and return */
1112 cp = tok2str(type2str, "unknown LS-type %u", GET_U_1(op->ospf_type));
1113 ND_PRINT("OSPFv%u, %s, length %u", GET_U_1(op->ospf_version), cp,
1114 length);
1115 if (*cp == 'u')
1116 return;
1117
1118 if (!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
1119 return;
1120 }
1121
1122 if (length != GET_BE_U_2(op->ospf_len)) {
1123 ND_PRINT(" [len %u]", GET_BE_U_2(op->ospf_len));
1124 }
1125
1126 if (length > GET_BE_U_2(op->ospf_len)) {
1127 dataend = bp + GET_BE_U_2(op->ospf_len);
1128 } else {
1129 dataend = bp + length;
1130 }
1131
1132 ND_PRINT("\n\tRouter-ID %s", GET_IPADDR_STRING(op->ospf_routerid));
1133
1134 if (GET_IPV4_TO_NETWORK_ORDER(op->ospf_areaid) != 0)
1135 ND_PRINT(", Area %s", GET_IPADDR_STRING(op->ospf_areaid));
1136 else
1137 ND_PRINT(", Backbone Area");
1138
1139 if (ndo->ndo_vflag) {
1140 /* Print authentication data (should we really do this?) */
1141 ND_TCHECK_LEN(op->ospf_authdata, sizeof(op->ospf_authdata));
1142
1143 ND_PRINT(", Authentication Type: %s (%u)",
1144 tok2str(ospf_authtype_values, "unknown", GET_BE_U_2(op->ospf_authtype)),
1145 GET_BE_U_2(op->ospf_authtype));
1146
1147 switch (GET_BE_U_2(op->ospf_authtype)) {
1148
1149 case OSPF_AUTH_NONE:
1150 break;
1151
1152 case OSPF_AUTH_SIMPLE:
1153 ND_PRINT("\n\tSimple text password: ");
1154 nd_printjnp(ndo, op->ospf_authdata, OSPF_AUTH_SIMPLE_LEN);
1155 break;
1156
1157 case OSPF_AUTH_MD5:
1158 ND_PRINT("\n\tKey-ID: %u, Auth-Length: %u, Crypto Sequence Number: 0x%08x",
1159 GET_U_1(op->ospf_authdata + 2),
1160 GET_U_1(op->ospf_authdata + 3),
1161 GET_BE_U_4((op->ospf_authdata) + 4));
1162 break;
1163
1164 default:
1165 return;
1166 }
1167 }
1168 /* Do rest according to version. */
1169 switch (GET_U_1(op->ospf_version)) {
1170
1171 case 2:
1172 /* ospf version 2 */
1173 if (ospf_decode_v2(ndo, op, dataend))
1174 goto trunc;
1175 if (length > GET_BE_U_2(op->ospf_len))
1176 ospf_decode_lls(ndo, op, length);
1177 break;
1178
1179 default:
1180 ND_PRINT(" ospf [version %u]", GET_U_1(op->ospf_version));
1181 break;
1182 } /* end switch on version */
1183
1184 return;
1185 trunc:
1186 nd_trunc_longjmp(ndo);
1187 }
1188