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OSPF: Update the option bit props.
[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_MT, "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_PRINT(", %s", GET_IPADDR_STRING(tptr));
495 break;
496
497 default:
498 if (ndo->ndo_vflag <= 1) {
499 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
500 return -1;
501 }
502 break;
503 }
504 /* in OSPF everything has to be 32-bit aligned, including TLVs */
505 if (tlv_length%4 != 0)
506 tlv_length+=4-(tlv_length%4);
507 if (tlv_length > ls_length) {
508 ND_PRINT("\n\t Bogus padded length %u > %u", tlv_length,
509 ls_length);
510 return -1;
511 }
512 ls_length-=tlv_length;
513 tptr+=tlv_length;
514 }
515 return 0;
516 trunc:
517 return -1;
518 invalid:
519 nd_print_invalid(ndo);
520 return -1;
521 }
522
523 static int
524 ospf_print_lshdr(netdissect_options *ndo,
525 const struct lsa_hdr *lshp)
526 {
527 u_int ls_type;
528 u_int ls_length;
529
530 ls_length = GET_BE_U_2(lshp->ls_length);
531 if (ls_length < sizeof(struct lsa_hdr)) {
532 ND_PRINT("\n\t Bogus length %u < header (%zu)", ls_length,
533 sizeof(struct lsa_hdr));
534 return(-1);
535 }
536 ND_PRINT("\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
537 GET_IPADDR_STRING(lshp->ls_router),
538 GET_BE_U_4(lshp->ls_seq),
539 GET_BE_U_2(lshp->ls_age),
540 ls_length - (u_int)sizeof(struct lsa_hdr));
541 ls_type = GET_U_1(lshp->ls_type);
542 switch (ls_type) {
543 /* the LSA header for opaque LSAs was slightly changed */
544 case LS_TYPE_OPAQUE_LL:
545 case LS_TYPE_OPAQUE_AL:
546 case LS_TYPE_OPAQUE_DW:
547 ND_PRINT("\n\t %s LSA (%u), Opaque-Type %s LSA (%u), Opaque-ID %u",
548 tok2str(lsa_values,"unknown",ls_type),
549 ls_type,
550
551 tok2str(lsa_opaque_values,
552 "unknown",
553 GET_U_1(lshp->un_lsa_id.opaque_field.opaque_type)),
554 GET_U_1(lshp->un_lsa_id.opaque_field.opaque_type),
555 GET_BE_U_3(lshp->un_lsa_id.opaque_field.opaque_id)
556
557 );
558 break;
559
560 /* all other LSA types use regular style LSA headers */
561 default:
562 ND_PRINT("\n\t %s LSA (%u), LSA-ID: %s",
563 tok2str(lsa_values,"unknown",ls_type),
564 ls_type,
565 GET_IPADDR_STRING(lshp->un_lsa_id.lsa_id));
566 break;
567 }
568 ND_PRINT("\n\t Options: [%s]",
569 bittok2str(ospf_option_values, "none", GET_U_1(lshp->ls_options)));
570
571 return (ls_length);
572 }
573
574 /* draft-ietf-ospf-mt-09 */
575 static const struct tok ospf_topology_values[] = {
576 { 0, "default" },
577 { 1, "multicast" },
578 { 2, "management" },
579 { 0, NULL }
580 };
581
582 /*
583 * Print all the per-topology metrics.
584 */
585 static int
586 ospf_print_tos_metrics(netdissect_options *ndo,
587 const union un_tos *tos)
588 {
589 u_int metric_count;
590 u_int toscount;
591 u_int tos_type;
592
593 toscount = GET_U_1(tos->link.link_tos_count)+1;
594 metric_count = 0;
595
596 /*
597 * All but the first metric contain a valid topology id.
598 */
599 while (toscount != 0) {
600 ND_TCHECK_SIZE(tos);
601 tos_type = GET_U_1(tos->metrics.tos_type);
602 ND_PRINT("\n\t\ttopology %s (%u), metric %u",
603 tok2str(ospf_topology_values, "Unknown",
604 metric_count ? tos_type : 0),
605 metric_count ? tos_type : 0,
606 GET_BE_U_2(tos->metrics.tos_metric));
607 metric_count++;
608 tos++;
609 toscount--;
610 }
611 return 0;
612 trunc:
613 return 1;
614 }
615
616 /*
617 * Print a single link state advertisement. If truncated or if LSA length
618 * field is less than the length of the LSA header, return NULl, else
619 * return pointer to data past end of LSA.
620 */
621 static const uint8_t *
622 ospf_print_lsa(netdissect_options *ndo,
623 const struct lsa *lsap)
624 {
625 const uint8_t *ls_end;
626 const struct rlalink *rlp;
627 const nd_ipv4 *ap;
628 const struct aslametric *almp;
629 const struct mcla *mcp;
630 const uint8_t *lp;
631 u_int tlv_type, tlv_length, rla_count, topology;
632 int ospf_print_lshdr_ret;
633 u_int ls_length;
634 const uint8_t *tptr;
635
636 tptr = (const uint8_t *)lsap->lsa_un.un_unknown; /* squelch compiler warnings */
637 ospf_print_lshdr_ret = ospf_print_lshdr(ndo, &lsap->ls_hdr);
638 if (ospf_print_lshdr_ret < 0)
639 return(NULL);
640 ls_length = (u_int)ospf_print_lshdr_ret;
641 ls_end = (const uint8_t *)lsap + ls_length;
642 /*
643 * ospf_print_lshdr() returns -1 if the length is too short,
644 * so we know ls_length is >= sizeof(struct lsa_hdr).
645 */
646 ls_length -= sizeof(struct lsa_hdr);
647
648 switch (GET_U_1(lsap->ls_hdr.ls_type)) {
649
650 case LS_TYPE_ROUTER:
651 ND_PRINT("\n\t Router LSA Options: [%s]",
652 bittok2str(ospf_rla_flag_values, "none", GET_U_1(lsap->lsa_un.un_rla.rla_flags)));
653
654 rla_count = GET_BE_U_2(lsap->lsa_un.un_rla.rla_count);
655 ND_TCHECK_SIZE(lsap->lsa_un.un_rla.rla_link);
656 rlp = lsap->lsa_un.un_rla.rla_link;
657 for (u_int i = rla_count; i != 0; i--) {
658 ND_TCHECK_SIZE(rlp);
659 switch (GET_U_1(rlp->un_tos.link.link_type)) {
660
661 case RLA_TYPE_VIRTUAL:
662 ND_PRINT("\n\t Virtual Link: Neighbor Router-ID: %s, Interface Address: %s",
663 GET_IPADDR_STRING(rlp->link_id),
664 GET_IPADDR_STRING(rlp->link_data));
665 break;
666
667 case RLA_TYPE_ROUTER:
668 ND_PRINT("\n\t Neighbor Router-ID: %s, Interface Address: %s",
669 GET_IPADDR_STRING(rlp->link_id),
670 GET_IPADDR_STRING(rlp->link_data));
671 break;
672
673 case RLA_TYPE_TRANSIT:
674 ND_PRINT("\n\t Neighbor Network-ID: %s, Interface Address: %s",
675 GET_IPADDR_STRING(rlp->link_id),
676 GET_IPADDR_STRING(rlp->link_data));
677 break;
678
679 case RLA_TYPE_STUB:
680 ND_PRINT("\n\t Stub Network: %s, Mask: %s",
681 GET_IPADDR_STRING(rlp->link_id),
682 GET_IPADDR_STRING(rlp->link_data));
683 break;
684
685 default:
686 ND_PRINT("\n\t Unknown Router Link Type (%u)",
687 GET_U_1(rlp->un_tos.link.link_type));
688 return (ls_end);
689 }
690
691 if (ospf_print_tos_metrics(ndo, &rlp->un_tos))
692 goto trunc;
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_TCHECK_SIZE(ap);
705 ND_PRINT("\n\t %s", GET_IPADDR_STRING(*ap));
706 ++ap;
707 }
708 break;
709
710 case LS_TYPE_SUM_IP:
711 ND_TCHECK_4(lsap->lsa_un.un_nla.nla_mask);
712 ND_PRINT("\n\t Mask %s",
713 GET_IPADDR_STRING(lsap->lsa_un.un_sla.sla_mask));
714 ND_TCHECK_SIZE(lsap->lsa_un.un_sla.sla_tosmetric);
715 lp = (const uint8_t *)lsap->lsa_un.un_sla.sla_tosmetric;
716 while (lp < ls_end) {
717 uint32_t ul;
718
719 ul = GET_BE_U_4(lp);
720 topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
721 ND_PRINT("\n\t\ttopology %s (%u) metric %u",
722 tok2str(ospf_topology_values, "Unknown", topology),
723 topology,
724 ul & SLA_MASK_METRIC);
725 lp += 4;
726 }
727 break;
728
729 case LS_TYPE_SUM_ABR:
730 ND_TCHECK_SIZE(lsap->lsa_un.un_sla.sla_tosmetric);
731 lp = (const uint8_t *)lsap->lsa_un.un_sla.sla_tosmetric;
732 while (lp < ls_end) {
733 uint32_t ul;
734
735 ul = GET_BE_U_4(lp);
736 topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
737 ND_PRINT("\n\t\ttopology %s (%u) metric %u",
738 tok2str(ospf_topology_values, "Unknown", topology),
739 topology,
740 ul & SLA_MASK_METRIC);
741 lp += 4;
742 }
743 break;
744
745 case LS_TYPE_ASE:
746 case LS_TYPE_NSSA: /* fall through - those LSAs share the same format */
747 ND_TCHECK_4(lsap->lsa_un.un_nla.nla_mask);
748 ND_PRINT("\n\t Mask %s",
749 GET_IPADDR_STRING(lsap->lsa_un.un_asla.asla_mask));
750
751 ND_TCHECK_SIZE(lsap->lsa_un.un_sla.sla_tosmetric);
752 almp = lsap->lsa_un.un_asla.asla_metric;
753 while ((const u_char *)almp < ls_end) {
754 uint32_t ul;
755
756 ul = GET_BE_U_4(almp->asla_tosmetric);
757 topology = ((ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS);
758 ND_PRINT("\n\t\ttopology %s (%u), type %u, metric",
759 tok2str(ospf_topology_values, "Unknown", topology),
760 topology,
761 (ul & ASLA_FLAG_EXTERNAL) ? 2 : 1);
762 if ((ul & ASLA_MASK_METRIC) == 0xffffff)
763 ND_PRINT(" infinite");
764 else
765 ND_PRINT(" %u", (ul & ASLA_MASK_METRIC));
766
767 if (GET_IPV4_TO_NETWORK_ORDER(almp->asla_forward) != 0) {
768 ND_PRINT(", forward %s", GET_IPADDR_STRING(almp->asla_forward));
769 }
770 if (GET_IPV4_TO_NETWORK_ORDER(almp->asla_tag) != 0) {
771 ND_PRINT(", tag %s", GET_IPADDR_STRING(almp->asla_tag));
772 }
773 ++almp;
774 }
775 break;
776
777 case LS_TYPE_GROUP:
778 /* Multicast extensions as of 23 July 1991 */
779 mcp = lsap->lsa_un.un_mcla;
780 while ((const u_char *)mcp < ls_end) {
781 switch (GET_BE_U_4(mcp->mcla_vtype)) {
782
783 case MCLA_VERTEX_ROUTER:
784 ND_PRINT("\n\t Router Router-ID %s",
785 GET_IPADDR_STRING(mcp->mcla_vid));
786 break;
787
788 case MCLA_VERTEX_NETWORK:
789 ND_PRINT("\n\t Network Designated Router %s",
790 GET_IPADDR_STRING(mcp->mcla_vid));
791 break;
792
793 default:
794 ND_PRINT("\n\t unknown VertexType (%u)",
795 GET_BE_U_4(mcp->mcla_vtype));
796 break;
797 }
798 ++mcp;
799 }
800 break;
801
802 case LS_TYPE_OPAQUE_LL: /* fall through */
803 case LS_TYPE_OPAQUE_AL:
804 case LS_TYPE_OPAQUE_DW:
805
806 switch (GET_U_1(lsap->ls_hdr.un_lsa_id.opaque_field.opaque_type)) {
807 case LS_OPAQUE_TYPE_RI:
808 tptr = (const uint8_t *)(lsap->lsa_un.un_ri_tlv);
809
810 u_int ls_length_remaining = ls_length;
811 while (ls_length_remaining != 0) {
812 ND_TCHECK_4(tptr);
813 if (ls_length_remaining < 4) {
814 ND_PRINT("\n\t Remaining LS length %u < 4", ls_length_remaining);
815 return(ls_end);
816 }
817 tlv_type = GET_BE_U_2(tptr);
818 tlv_length = GET_BE_U_2(tptr + 2);
819 tptr+=4;
820 ls_length_remaining-=4;
821
822 ND_PRINT("\n\t %s TLV (%u), length: %u, value: ",
823 tok2str(lsa_opaque_ri_tlv_values,"unknown",tlv_type),
824 tlv_type,
825 tlv_length);
826
827 if (tlv_length > ls_length_remaining) {
828 ND_PRINT("\n\t Bogus length %u > remaining LS length %u", tlv_length,
829 ls_length_remaining);
830 return(ls_end);
831 }
832 ND_TCHECK_LEN(tptr, tlv_length);
833 switch(tlv_type) {
834
835 case LS_OPAQUE_RI_TLV_CAP:
836 if (tlv_length != 4) {
837 ND_PRINT("\n\t Bogus length %u != 4", tlv_length);
838 return(ls_end);
839 }
840 ND_PRINT("Capabilities: %s",
841 bittok2str(lsa_opaque_ri_tlv_cap_values, "Unknown", GET_BE_U_4(tptr)));
842 break;
843 default:
844 if (ndo->ndo_vflag <= 1) {
845 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
846 return(ls_end);
847 }
848 break;
849
850 }
851 tptr+=tlv_length;
852 ls_length_remaining-=tlv_length;
853 }
854 break;
855
856 case LS_OPAQUE_TYPE_GRACE:
857 if (ospf_grace_lsa_print(ndo, (const u_char *)(lsap->lsa_un.un_grace_tlv),
858 ls_length) == -1) {
859 return(ls_end);
860 }
861 break;
862
863 case LS_OPAQUE_TYPE_TE:
864 if (ospf_te_lsa_print(ndo, (const u_char *)(lsap->lsa_un.un_te_lsa_tlv),
865 ls_length) == -1) {
866 return(ls_end);
867 }
868 break;
869
870 default:
871 if (ndo->ndo_vflag <= 1) {
872 if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
873 "\n\t ", ls_length))
874 return(ls_end);
875 }
876 break;
877 }
878 }
879
880 /* do we want to see an additionally hexdump ? */
881 if (ndo->ndo_vflag> 1)
882 if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
883 "\n\t ", ls_length)) {
884 return(ls_end);
885 }
886
887 return (ls_end);
888 trunc:
889 return (NULL);
890 }
891
892 static int
893 ospf_decode_lls(netdissect_options *ndo,
894 const struct ospfhdr *op, u_int length)
895 {
896 const u_char *dptr;
897 const u_char *dataend;
898 u_int length2;
899 uint16_t lls_type, lls_len;
900 uint32_t lls_flags;
901
902 switch (GET_U_1(op->ospf_type)) {
903
904 case OSPF_TYPE_HELLO:
905 if (!(GET_U_1(op->ospf_hello.hello_options) & OSPF_OPTION_L))
906 return (0);
907 break;
908
909 case OSPF_TYPE_DD:
910 if (!(GET_U_1(op->ospf_db.db_options) & OSPF_OPTION_L))
911 return (0);
912 break;
913
914 default:
915 return (0);
916 }
917
918 /* dig deeper if LLS data is available; see RFC4813 */
919 length2 = GET_BE_U_2(op->ospf_len);
920 dptr = (const u_char *)op + length2;
921 dataend = (const u_char *)op + length;
922
923 if (GET_BE_U_2(op->ospf_authtype) == OSPF_AUTH_MD5) {
924 dptr = dptr + op->ospf_authdata[3];
925 length2 += op->ospf_authdata[3];
926 }
927 if (length2 >= length) {
928 ND_PRINT("\n\t[LLS truncated]");
929 return (1);
930 }
931 ND_PRINT("\n\t LLS: checksum: 0x%04x", (u_int) GET_BE_U_2(dptr));
932
933 dptr += 2;
934 length2 = GET_BE_U_2(dptr);
935 ND_PRINT(", length: %u", length2);
936
937 dptr += 2;
938 while (dptr < dataend) {
939 lls_type = GET_BE_U_2(dptr);
940 ND_PRINT("\n\t %s (%u)",
941 tok2str(ospf_lls_tlv_values,"Unknown TLV",lls_type),
942 lls_type);
943 dptr += 2;
944 lls_len = GET_BE_U_2(dptr);
945 ND_PRINT(", length: %u", lls_len);
946 dptr += 2;
947 switch (lls_type) {
948
949 case OSPF_LLS_EO:
950 if (lls_len != 4) {
951 ND_PRINT(" [should be 4]");
952 lls_len = 4;
953 }
954 lls_flags = GET_BE_U_4(dptr);
955 ND_PRINT("\n\t Options: 0x%08x [%s]", lls_flags,
956 bittok2str(ospf_lls_eo_options, "?", lls_flags));
957
958 break;
959
960 case OSPF_LLS_MD5:
961 if (lls_len != 20) {
962 ND_PRINT(" [should be 20]");
963 lls_len = 20;
964 }
965 ND_PRINT("\n\t Sequence number: 0x%08x", GET_BE_U_4(dptr));
966 break;
967 }
968
969 dptr += lls_len;
970 }
971
972 return (0);
973 }
974
975 static int
976 ospf_decode_v2(netdissect_options *ndo,
977 const struct ospfhdr *op, const u_char *dataend)
978 {
979 const nd_ipv4 *ap;
980 const struct lsr *lsrp;
981 const struct lsa_hdr *lshp;
982 const struct lsa *lsap;
983 uint32_t lsa_count,lsa_count_max;
984
985 switch (GET_U_1(op->ospf_type)) {
986
987 case OSPF_TYPE_HELLO:
988 ND_PRINT("\n\tOptions [%s]",
989 bittok2str(ospf_option_values,"none",GET_U_1(op->ospf_hello.hello_options)));
990
991 ND_PRINT("\n\t Hello Timer %us, Dead Timer %us, Mask %s, Priority %u",
992 GET_BE_U_2(op->ospf_hello.hello_helloint),
993 GET_BE_U_4(op->ospf_hello.hello_deadint),
994 GET_IPADDR_STRING(op->ospf_hello.hello_mask),
995 GET_U_1(op->ospf_hello.hello_priority));
996
997 if (GET_IPV4_TO_NETWORK_ORDER(op->ospf_hello.hello_dr) != 0)
998 ND_PRINT("\n\t Designated Router %s",
999 GET_IPADDR_STRING(op->ospf_hello.hello_dr));
1000
1001 if (GET_IPV4_TO_NETWORK_ORDER(op->ospf_hello.hello_bdr) != 0)
1002 ND_PRINT(", Backup Designated Router %s",
1003 GET_IPADDR_STRING(op->ospf_hello.hello_bdr));
1004
1005 ap = op->ospf_hello.hello_neighbor;
1006 if ((const u_char *)ap < dataend)
1007 ND_PRINT("\n\t Neighbor List:");
1008 while ((const u_char *)ap < dataend) {
1009 ND_TCHECK_SIZE(ap);
1010 ND_PRINT("\n\t %s", GET_IPADDR_STRING(*ap));
1011 ++ap;
1012 }
1013 break; /* HELLO */
1014
1015 case OSPF_TYPE_DD:
1016 ND_PRINT("\n\tOptions [%s]",
1017 bittok2str(ospf_option_values, "none", GET_U_1(op->ospf_db.db_options)));
1018 ND_PRINT(", DD Flags [%s]",
1019 bittok2str(ospf_dd_flag_values, "none", GET_U_1(op->ospf_db.db_flags)));
1020 if (GET_BE_U_2(op->ospf_db.db_ifmtu)) {
1021 ND_PRINT(", MTU: %u",
1022 GET_BE_U_2(op->ospf_db.db_ifmtu));
1023 }
1024 ND_PRINT(", Sequence: 0x%08x", GET_BE_U_4(op->ospf_db.db_seq));
1025
1026 /* Print all the LS adv's */
1027 lshp = op->ospf_db.db_lshdr;
1028 while (((const u_char *)lshp < dataend) && ospf_print_lshdr(ndo, lshp) != -1) {
1029 ++lshp;
1030 }
1031 break;
1032
1033 case OSPF_TYPE_LS_REQ:
1034 lsrp = op->ospf_lsr;
1035 while ((const u_char *)lsrp < dataend) {
1036 ND_TCHECK_SIZE(lsrp);
1037
1038 ND_PRINT("\n\t Advertising Router: %s, %s LSA (%u)",
1039 GET_IPADDR_STRING(lsrp->ls_router),
1040 tok2str(lsa_values,"unknown",GET_BE_U_4(lsrp->ls_type)),
1041 GET_BE_U_4(lsrp->ls_type));
1042
1043 switch (GET_BE_U_4(lsrp->ls_type)) {
1044 /* the LSA header for opaque LSAs was slightly changed */
1045 case LS_TYPE_OPAQUE_LL:
1046 case LS_TYPE_OPAQUE_AL:
1047 case LS_TYPE_OPAQUE_DW:
1048 ND_PRINT(", Opaque-Type: %s LSA (%u), Opaque-ID: %u",
1049 tok2str(lsa_opaque_values, "unknown",GET_U_1(lsrp->un_ls_stateid.opaque_field.opaque_type)),
1050 GET_U_1(lsrp->un_ls_stateid.opaque_field.opaque_type),
1051 GET_BE_U_3(lsrp->un_ls_stateid.opaque_field.opaque_id));
1052 break;
1053 default:
1054 ND_PRINT(", LSA-ID: %s",
1055 GET_IPADDR_STRING(lsrp->un_ls_stateid.ls_stateid));
1056 break;
1057 }
1058
1059 ++lsrp;
1060 }
1061 break;
1062
1063 case OSPF_TYPE_LS_UPDATE:
1064 lsap = op->ospf_lsu.lsu_lsa;
1065 lsa_count_max = GET_BE_U_4(op->ospf_lsu.lsu_count);
1066 ND_PRINT(", %u LSA%s", lsa_count_max, PLURAL_SUFFIX(lsa_count_max));
1067 for (lsa_count=1;lsa_count <= lsa_count_max;lsa_count++) {
1068 ND_PRINT("\n\t LSA #%u", lsa_count);
1069 lsap = (const struct lsa *)ospf_print_lsa(ndo, lsap);
1070 if (lsap == NULL)
1071 goto trunc;
1072 }
1073 break;
1074
1075 case OSPF_TYPE_LS_ACK:
1076 lshp = op->ospf_lsa.lsa_lshdr;
1077 while (ospf_print_lshdr(ndo, lshp) != -1) {
1078 ++lshp;
1079 }
1080 break;
1081
1082 default:
1083 break;
1084 }
1085 return (0);
1086 trunc:
1087 return (1);
1088 }
1089
1090 void
1091 ospf_print(netdissect_options *ndo,
1092 const u_char *bp, u_int length,
1093 const u_char *bp2 _U_)
1094 {
1095 const struct ospfhdr *op;
1096 const u_char *dataend;
1097 const char *cp;
1098
1099 ndo->ndo_protocol = "ospf2";
1100 op = (const struct ospfhdr *)bp;
1101
1102 /* XXX Before we do anything else, strip off the MD5 trailer */
1103 if (GET_BE_U_2(op->ospf_authtype) == OSPF_AUTH_MD5) {
1104 length -= OSPF_AUTH_MD5_LEN;
1105 ndo->ndo_snapend -= OSPF_AUTH_MD5_LEN;
1106 }
1107
1108 /* If the type is valid translate it, or just print the type */
1109 /* value. If it's not valid, say so and return */
1110 cp = tok2str(type2str, "unknown LS-type %u", GET_U_1(op->ospf_type));
1111 ND_PRINT("OSPFv%u, %s, length %u", GET_U_1(op->ospf_version), cp,
1112 length);
1113 if (*cp == 'u')
1114 return;
1115
1116 if (!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
1117 return;
1118 }
1119
1120 if (length != GET_BE_U_2(op->ospf_len)) {
1121 ND_PRINT(" [len %u]", GET_BE_U_2(op->ospf_len));
1122 }
1123
1124 if (length > GET_BE_U_2(op->ospf_len)) {
1125 dataend = bp + GET_BE_U_2(op->ospf_len);
1126 } else {
1127 dataend = bp + length;
1128 }
1129
1130 ND_PRINT("\n\tRouter-ID %s", GET_IPADDR_STRING(op->ospf_routerid));
1131
1132 if (GET_IPV4_TO_NETWORK_ORDER(op->ospf_areaid) != 0)
1133 ND_PRINT(", Area %s", GET_IPADDR_STRING(op->ospf_areaid));
1134 else
1135 ND_PRINT(", Backbone Area");
1136
1137 if (ndo->ndo_vflag) {
1138 /* Print authentication data (should we really do this?) */
1139 ND_TCHECK_LEN(op->ospf_authdata, sizeof(op->ospf_authdata));
1140
1141 ND_PRINT(", Authentication Type: %s (%u)",
1142 tok2str(ospf_authtype_values, "unknown", GET_BE_U_2(op->ospf_authtype)),
1143 GET_BE_U_2(op->ospf_authtype));
1144
1145 switch (GET_BE_U_2(op->ospf_authtype)) {
1146
1147 case OSPF_AUTH_NONE:
1148 break;
1149
1150 case OSPF_AUTH_SIMPLE:
1151 ND_PRINT("\n\tSimple text password: ");
1152 (void)nd_printzp(ndo, op->ospf_authdata, OSPF_AUTH_SIMPLE_LEN, NULL);
1153 break;
1154
1155 case OSPF_AUTH_MD5:
1156 ND_PRINT("\n\tKey-ID: %u, Auth-Length: %u, Crypto Sequence Number: 0x%08x",
1157 *((op->ospf_authdata) + 2),
1158 *((op->ospf_authdata) + 3),
1159 GET_BE_U_4((op->ospf_authdata) + 4));
1160 break;
1161
1162 default:
1163 return;
1164 }
1165 }
1166 /* Do rest according to version. */
1167 switch (GET_U_1(op->ospf_version)) {
1168
1169 case 2:
1170 /* ospf version 2 */
1171 if (ospf_decode_v2(ndo, op, dataend))
1172 goto trunc;
1173 if (length > GET_BE_U_2(op->ospf_len)) {
1174 if (ospf_decode_lls(ndo, op, length))
1175 goto trunc;
1176 }
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_print_trunc(ndo);
1187 }
[mirror] the TCPdump network dissector