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1 office 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 #define NETDISSECT_REWORKED
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28  
29 #include <tcpdump-stdinc.h>
30  
31 #include "interface.h"
32 #include "addrtoname.h"
33 #include "extract.h"
34 #include "gmpls.h"
35  
36 #include "ospf.h"
37  
38 static const char tstr[] = " [|ospf2]";
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_UMD, "UMD" },
69 { OSPF_TYPE_HELLO, "Hello" },
70 { OSPF_TYPE_DD, "Database Description" },
71 { OSPF_TYPE_LS_REQ, "LS-Request" },
72 { OSPF_TYPE_LS_UPDATE, "LS-Update" },
73 { OSPF_TYPE_LS_ACK, "LS-Ack" },
74 { 0, NULL }
75 };
76  
77 static const struct tok lsa_values[] = {
78 { LS_TYPE_ROUTER, "Router" },
79 { LS_TYPE_NETWORK, "Network" },
80 { LS_TYPE_SUM_IP, "Summary" },
81 { LS_TYPE_SUM_ABR, "ASBR Summary" },
82 { LS_TYPE_ASE, "External" },
83 { LS_TYPE_GROUP, "Multicast Group" },
84 { LS_TYPE_NSSA, "NSSA" },
85 { LS_TYPE_OPAQUE_LL, "Link Local Opaque" },
86 { LS_TYPE_OPAQUE_AL, "Area Local Opaque" },
87 { LS_TYPE_OPAQUE_DW, "Domain Wide Opaque" },
88 { 0, NULL }
89 };
90  
91 static const struct tok ospf_dd_flag_values[] = {
92 { OSPF_DB_INIT, "Init" },
93 { OSPF_DB_MORE, "More" },
94 { OSPF_DB_MASTER, "Master" },
95 { OSPF_DB_RESYNC, "OOBResync" },
96 { 0, NULL }
97 };
98  
99 static const struct tok lsa_opaque_values[] = {
100 { LS_OPAQUE_TYPE_TE, "Traffic Engineering" },
101 { LS_OPAQUE_TYPE_GRACE, "Graceful restart" },
102 { LS_OPAQUE_TYPE_RI, "Router Information" },
103 { 0, NULL }
104 };
105  
106 static const struct tok lsa_opaque_te_tlv_values[] = {
107 { LS_OPAQUE_TE_TLV_ROUTER, "Router Address" },
108 { LS_OPAQUE_TE_TLV_LINK, "Link" },
109 { 0, NULL }
110 };
111  
112 static const struct tok lsa_opaque_te_link_tlv_subtlv_values[] = {
113 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE, "Link Type" },
114 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID, "Link ID" },
115 { LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP, "Local Interface IP address" },
116 { LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP, "Remote Interface IP address" },
117 { LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC, "Traffic Engineering Metric" },
118 { LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW, "Maximum Bandwidth" },
119 { LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW, "Maximum Reservable Bandwidth" },
120 { LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW, "Unreserved Bandwidth" },
121 { LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP, "Administrative Group" },
122 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
123 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE, "Link Protection Type" },
124 { LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR, "Interface Switching Capability" },
125 { LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP, "Shared Risk Link Group" },
126 { LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS, "Bandwidth Constraints" },
127 { 0, NULL }
128 };
129  
130 static const struct tok lsa_opaque_grace_tlv_values[] = {
131 { LS_OPAQUE_GRACE_TLV_PERIOD, "Grace Period" },
132 { LS_OPAQUE_GRACE_TLV_REASON, "Graceful restart Reason" },
133 { LS_OPAQUE_GRACE_TLV_INT_ADDRESS, "IPv4 interface address" },
134 { 0, NULL }
135 };
136  
137 static const struct tok lsa_opaque_grace_tlv_reason_values[] = {
138 { LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN, "Unknown" },
139 { LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART, "Software Restart" },
140 { LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE, "Software Reload/Upgrade" },
141 { LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH, "Control Processor Switch" },
142 { 0, NULL }
143 };
144  
145 static const struct tok lsa_opaque_te_tlv_link_type_sub_tlv_values[] = {
146 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP, "Point-to-point" },
147 { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA, "Multi-Access" },
148 { 0, NULL }
149 };
150  
151 static const struct tok lsa_opaque_ri_tlv_values[] = {
152 { LS_OPAQUE_RI_TLV_CAP, "Router Capabilities" },
153 { 0, NULL }
154 };
155  
156 static const struct tok lsa_opaque_ri_tlv_cap_values[] = {
157 { 1, "Reserved" },
158 { 2, "Reserved" },
159 { 4, "Reserved" },
160 { 8, "Reserved" },
161 { 16, "graceful restart capable" },
162 { 32, "graceful restart helper" },
163 { 64, "Stub router support" },
164 { 128, "Traffic engineering" },
165 { 256, "p2p over LAN" },
166 { 512, "path computation server" },
167 { 0, NULL }
168 };
169  
170 static const struct tok ospf_lls_tlv_values[] = {
171 { OSPF_LLS_EO, "Extended Options" },
172 { OSPF_LLS_MD5, "MD5 Authentication" },
173 { 0, NULL }
174 };
175  
176 static const struct tok ospf_lls_eo_options[] = {
177 { OSPF_LLS_EO_LR, "LSDB resync" },
178 { OSPF_LLS_EO_RS, "Restart" },
179 { 0, NULL }
180 };
181  
182 int
183 ospf_print_grace_lsa(netdissect_options *ndo,
184 const uint8_t *tptr, u_int ls_length)
185 {
186 u_int tlv_type, tlv_length;
187  
188  
189 while (ls_length > 0) {
190 ND_TCHECK2(*tptr, 4);
191 if (ls_length < 4) {
192 ND_PRINT((ndo, "\n\t Remaining LS length %u < 4", ls_length));
193 return -1;
194 }
195 tlv_type = EXTRACT_16BITS(tptr);
196 tlv_length = EXTRACT_16BITS(tptr+2);
197 tptr+=4;
198 ls_length-=4;
199  
200 ND_PRINT((ndo, "\n\t %s TLV (%u), length %u, value: ",
201 tok2str(lsa_opaque_grace_tlv_values,"unknown",tlv_type),
202 tlv_type,
203 tlv_length));
204  
205 if (tlv_length > ls_length) {
206 ND_PRINT((ndo, "\n\t Bogus length %u > %u", tlv_length,
207 ls_length));
208 return -1;
209 }
210  
211 /* Infinite loop protection. */
212 if (tlv_type == 0 || tlv_length ==0) {
213 return -1;
214 }
215  
216 ND_TCHECK2(*tptr, tlv_length);
217 switch(tlv_type) {
218  
219 case LS_OPAQUE_GRACE_TLV_PERIOD:
220 if (tlv_length != 4) {
221 ND_PRINT((ndo, "\n\t Bogus length %u != 4", tlv_length));
222 return -1;
223 }
224 ND_PRINT((ndo, "%us", EXTRACT_32BITS(tptr)));
225 break;
226  
227 case LS_OPAQUE_GRACE_TLV_REASON:
228 if (tlv_length != 1) {
229 ND_PRINT((ndo, "\n\t Bogus length %u != 1", tlv_length));
230 return -1;
231 }
232 ND_PRINT((ndo, "%s (%u)",
233 tok2str(lsa_opaque_grace_tlv_reason_values, "Unknown", *tptr),
234 *tptr));
235 break;
236  
237 case LS_OPAQUE_GRACE_TLV_INT_ADDRESS:
238 if (tlv_length != 4) {
239 ND_PRINT((ndo, "\n\t Bogus length %u != 4", tlv_length));
240 return -1;
241 }
242 ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
243 break;
244  
245 default:
246 if (ndo->ndo_vflag <= 1) {
247 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
248 return -1;
249 }
250 break;
251  
252 }
253 /* in OSPF everything has to be 32-bit aligned, including TLVs */
254 if (tlv_length%4 != 0)
255 tlv_length+=4-(tlv_length%4);
256 ls_length-=tlv_length;
257 tptr+=tlv_length;
258 }
259  
260 return 0;
261 trunc:
262 return -1;
263 }
264  
265 int
266 ospf_print_te_lsa(netdissect_options *ndo,
267 const uint8_t *tptr, u_int ls_length)
268 {
269 u_int tlv_type, tlv_length, subtlv_type, subtlv_length;
270 u_int priority_level, te_class, count_srlg;
271 union { /* int to float conversion buffer for several subTLVs */
272 float f;
273 uint32_t i;
274 } bw;
275  
276 while (ls_length != 0) {
277 ND_TCHECK2(*tptr, 4);
278 if (ls_length < 4) {
279 ND_PRINT((ndo, "\n\t Remaining LS length %u < 4", ls_length));
280 return -1;
281 }
282 tlv_type = EXTRACT_16BITS(tptr);
283 tlv_length = EXTRACT_16BITS(tptr+2);
284 tptr+=4;
285 ls_length-=4;
286  
287 ND_PRINT((ndo, "\n\t %s TLV (%u), length: %u",
288 tok2str(lsa_opaque_te_tlv_values,"unknown",tlv_type),
289 tlv_type,
290 tlv_length));
291  
292 if (tlv_length > ls_length) {
293 ND_PRINT((ndo, "\n\t Bogus length %u > %u", tlv_length,
294 ls_length));
295 return -1;
296 }
297  
298 /* Infinite loop protection. */
299 if (tlv_type == 0 || tlv_length ==0) {
300 return -1;
301 }
302  
303 switch(tlv_type) {
304 case LS_OPAQUE_TE_TLV_LINK:
305 while (tlv_length >= sizeof(subtlv_type) + sizeof(subtlv_length)) {
306 if (tlv_length < 4) {
307 ND_PRINT((ndo, "\n\t Remaining TLV length %u < 4",
308 tlv_length));
309 return -1;
310 }
311 ND_TCHECK2(*tptr, 4);
312 subtlv_type = EXTRACT_16BITS(tptr);
313 subtlv_length = EXTRACT_16BITS(tptr+2);
314 tptr+=4;
315 tlv_length-=4;
316  
317 ND_PRINT((ndo, "\n\t %s subTLV (%u), length: %u",
318 tok2str(lsa_opaque_te_link_tlv_subtlv_values,"unknown",subtlv_type),
319 subtlv_type,
320 subtlv_length));
321  
322 ND_TCHECK2(*tptr, subtlv_length);
323 switch(subtlv_type) {
324 case LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP:
325 ND_PRINT((ndo, ", 0x%08x", EXTRACT_32BITS(tptr)));
326 break;
327 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID:
328 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID:
329 ND_PRINT((ndo, ", %s (0x%08x)",
330 ipaddr_string(ndo, tptr),
331 EXTRACT_32BITS(tptr)));
332 if (subtlv_length == 8) /* rfc4203 */
333 ND_PRINT((ndo, ", %s (0x%08x)",
334 ipaddr_string(ndo, tptr+4),
335 EXTRACT_32BITS(tptr + 4)));
336 break;
337 case LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP:
338 case LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP:
339 ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr)));
340 break;
341 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW:
342 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW:
343 bw.i = EXTRACT_32BITS(tptr);
344 ND_PRINT((ndo, ", %.3f Mbps", bw.f * 8 / 1000000));
345 break;
346 case LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW:
347 for (te_class = 0; te_class < 8; te_class++) {
348 bw.i = EXTRACT_32BITS(tptr+te_class*4);
349 ND_PRINT((ndo, "\n\t\tTE-Class %u: %.3f Mbps",
350 te_class,
351 bw.f * 8 / 1000000));
352 }
353 break;
354 case LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS:
355 ND_PRINT((ndo, "\n\t\tBandwidth Constraints Model ID: %s (%u)",
356 tok2str(diffserv_te_bc_values, "unknown", *tptr),
357 *tptr));
358 /* decode BCs until the subTLV ends */
359 for (te_class = 0; te_class < (subtlv_length-4)/4; te_class++) {
360 bw.i = EXTRACT_32BITS(tptr+4+te_class*4);
361 ND_PRINT((ndo, "\n\t\t Bandwidth constraint CT%u: %.3f Mbps",
362 te_class,
363 bw.f * 8 / 1000000));
364 }
365 break;
366 case LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC:
367 ND_PRINT((ndo, ", Metric %u", EXTRACT_32BITS(tptr)));
368 break;
369 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE:
370 ND_PRINT((ndo, ", %s, Priority %u",
371 bittok2str(gmpls_link_prot_values, "none", *tptr),
372 *(tptr + 1)));
373 break;
374 case LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR:
375 ND_PRINT((ndo, "\n\t\tInterface Switching Capability: %s",
376 tok2str(gmpls_switch_cap_values, "Unknown", *(tptr))));
377 ND_PRINT((ndo, "\n\t\tLSP Encoding: %s\n\t\tMax LSP Bandwidth:",
378 tok2str(gmpls_encoding_values, "Unknown", *(tptr + 1))));
379 for (priority_level = 0; priority_level < 8; priority_level++) {
380 bw.i = EXTRACT_32BITS(tptr+4+(priority_level*4));
381 ND_PRINT((ndo, "\n\t\t priority level %d: %.3f Mbps",
382 priority_level,
383 bw.f * 8 / 1000000));
384 }
385 break;
386 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE:
387 ND_PRINT((ndo, ", %s (%u)",
388 tok2str(lsa_opaque_te_tlv_link_type_sub_tlv_values,"unknown",*tptr),
389 *tptr));
390 break;
391  
392 case LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP:
393 count_srlg = subtlv_length / 4;
394 if (count_srlg != 0)
395 ND_PRINT((ndo, "\n\t\t Shared risk group: "));
396 while (count_srlg > 0) {
397 bw.i = EXTRACT_32BITS(tptr);
398 ND_PRINT((ndo, "%d", bw.i));
399 tptr+=4;
400 count_srlg--;
401 if (count_srlg > 0)
402 ND_PRINT((ndo, ", "));
403 }
404 break;
405  
406 default:
407 if (ndo->ndo_vflag <= 1) {
408 if (!print_unknown_data(ndo, tptr, "\n\t\t", subtlv_length))
409 return -1;
410 }
411 break;
412 }
413 /* in OSPF everything has to be 32-bit aligned, including subTLVs */
414 if (subtlv_length%4 != 0)
415 subtlv_length+=4-(subtlv_length%4);
416  
417 tlv_length-=subtlv_length;
418 tptr+=subtlv_length;
419  
420 }
421 break;
422  
423 case LS_OPAQUE_TE_TLV_ROUTER:
424 if (tlv_length < 4) {
425 ND_PRINT((ndo, "\n\t TLV length %u < 4", tlv_length));
426 return -1;
427 }
428 ND_TCHECK2(*tptr, 4);
429 ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr)));
430 break;
431  
432 default:
433 if (ndo->ndo_vflag <= 1) {
434 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
435 return -1;
436 }
437 break;
438 }
439 /* in OSPF everything has to be 32-bit aligned, including TLVs */
440 if (tlv_length%4 != 0)
441 tlv_length+=4-(tlv_length%4);
442 ls_length-=tlv_length;
443 tptr+=tlv_length;
444 }
445 return 0;
446 trunc:
447 return -1;
448 }
449  
450 static int
451 ospf_print_lshdr(netdissect_options *ndo,
452 register const struct lsa_hdr *lshp)
453 {
454 u_int ls_length;
455  
456 ND_TCHECK(lshp->ls_length);
457 ls_length = EXTRACT_16BITS(&lshp->ls_length);
458 if (ls_length < sizeof(struct lsa_hdr)) {
459 ND_PRINT((ndo, "\n\t Bogus length %u < header (%lu)", ls_length,
460 (unsigned long)sizeof(struct lsa_hdr)));
461 return(-1);
462 }
463  
464 ND_TCHECK(lshp->ls_seq); /* XXX - ls_length check checked this */
465 ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
466 ipaddr_string(ndo, &lshp->ls_router),
467 EXTRACT_32BITS(&lshp->ls_seq),
468 EXTRACT_16BITS(&lshp->ls_age),
469 ls_length - (u_int)sizeof(struct lsa_hdr)));
470  
471 ND_TCHECK(lshp->ls_type); /* XXX - ls_length check checked this */
472 switch (lshp->ls_type) {
473 /* the LSA header for opaque LSAs was slightly changed */
474 case LS_TYPE_OPAQUE_LL:
475 case LS_TYPE_OPAQUE_AL:
476 case LS_TYPE_OPAQUE_DW:
477 ND_PRINT((ndo, "\n\t %s LSA (%d), Opaque-Type %s LSA (%u), Opaque-ID %u",
478 tok2str(lsa_values,"unknown",lshp->ls_type),
479 lshp->ls_type,
480  
481 tok2str(lsa_opaque_values,
482 "unknown",
483 *(&lshp->un_lsa_id.opaque_field.opaque_type)),
484 *(&lshp->un_lsa_id.opaque_field.opaque_type),
485 EXTRACT_24BITS(&lshp->un_lsa_id.opaque_field.opaque_id)
486  
487 ));
488 break;
489  
490 /* all other LSA types use regular style LSA headers */
491 default:
492 ND_PRINT((ndo, "\n\t %s LSA (%d), LSA-ID: %s",
493 tok2str(lsa_values,"unknown",lshp->ls_type),
494 lshp->ls_type,
495 ipaddr_string(ndo, &lshp->un_lsa_id.lsa_id)));
496 break;
497 }
498  
499 ND_TCHECK(lshp->ls_options); /* XXX - ls_length check checked this */
500 ND_PRINT((ndo, "\n\t Options: [%s]", bittok2str(ospf_option_values, "none", lshp->ls_options)));
501  
502 return (ls_length);
503 trunc:
504 return (-1);
505 }
506  
507 /* draft-ietf-ospf-mt-09 */
508 static const struct tok ospf_topology_values[] = {
509 { 0, "default " },
510 { 1, "multicast " },
511 { 2, "management " },
512 { 0, NULL }
513 };
514  
515 /*
516 * Print all the per-topology metrics.
517 */
518 static void
519 ospf_print_tos_metrics(netdissect_options *ndo,
520 const union un_tos *tos)
521 {
522 int metric_count;
523 int toscount;
524  
525 toscount = tos->link.link_tos_count+1;
526 metric_count = 0;
527  
528 /*
529 * All but the first metric contain a valid topology id.
530 */
531 while (toscount) {
532 ND_PRINT((ndo, "\n\t\ttopology %s(%u), metric %u",
533 tok2str(ospf_topology_values, "",
534 metric_count ? tos->metrics.tos_type : 0),
535 metric_count ? tos->metrics.tos_type : 0,
536 EXTRACT_16BITS(&tos->metrics.tos_metric)));
537 metric_count++;
538 tos++;
539 toscount--;
540 }
541 }
542  
543 /*
544 * Print a single link state advertisement. If truncated or if LSA length
545 * field is less than the length of the LSA header, return NULl, else
546 * return pointer to data past end of LSA.
547 */
548 static const uint8_t *
549 ospf_print_lsa(netdissect_options *ndo,
550 register const struct lsa *lsap)
551 {
552 register const uint8_t *ls_end;
553 register const struct rlalink *rlp;
554 register const struct in_addr *ap;
555 register const struct aslametric *almp;
556 register const struct mcla *mcp;
557 register const uint32_t *lp;
558 register int j, tlv_type, tlv_length, topology;
559 register int ls_length;
560 const uint8_t *tptr;
561  
562 tptr = (uint8_t *)lsap->lsa_un.un_unknown; /* squelch compiler warnings */
563 ls_length = ospf_print_lshdr(ndo, &lsap->ls_hdr);
564 if (ls_length == -1)
565 return(NULL);
566 ls_end = (uint8_t *)lsap + ls_length;
567 ls_length -= sizeof(struct lsa_hdr);
568  
569 switch (lsap->ls_hdr.ls_type) {
570  
571 case LS_TYPE_ROUTER:
572 ND_TCHECK(lsap->lsa_un.un_rla.rla_flags);
573 ND_PRINT((ndo, "\n\t Router LSA Options: [%s]",
574 bittok2str(ospf_rla_flag_values, "none", lsap->lsa_un.un_rla.rla_flags)));
575  
576 ND_TCHECK(lsap->lsa_un.un_rla.rla_count);
577 j = EXTRACT_16BITS(&lsap->lsa_un.un_rla.rla_count);
578 ND_TCHECK(lsap->lsa_un.un_rla.rla_link);
579 rlp = lsap->lsa_un.un_rla.rla_link;
580 while (j--) {
581 ND_TCHECK(*rlp);
582 switch (rlp->un_tos.link.link_type) {
583  
584 case RLA_TYPE_VIRTUAL:
585 ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID: %s, Interface Address: %s",
586 ipaddr_string(ndo, &rlp->link_id),
587 ipaddr_string(ndo, &rlp->link_data)));
588 break;
589  
590 case RLA_TYPE_ROUTER:
591 ND_PRINT((ndo, "\n\t Neighbor Router-ID: %s, Interface Address: %s",
592 ipaddr_string(ndo, &rlp->link_id),
593 ipaddr_string(ndo, &rlp->link_data)));
594 break;
595  
596 case RLA_TYPE_TRANSIT:
597 ND_PRINT((ndo, "\n\t Neighbor Network-ID: %s, Interface Address: %s",
598 ipaddr_string(ndo, &rlp->link_id),
599 ipaddr_string(ndo, &rlp->link_data)));
600 break;
601  
602 case RLA_TYPE_STUB:
603 ND_PRINT((ndo, "\n\t Stub Network: %s, Mask: %s",
604 ipaddr_string(ndo, &rlp->link_id),
605 ipaddr_string(ndo, &rlp->link_data)));
606 break;
607  
608 default:
609 ND_PRINT((ndo, "\n\t Unknown Router Link Type (%u)",
610 rlp->un_tos.link.link_type));
611 return (ls_end);
612 }
613  
614 ospf_print_tos_metrics(ndo, &rlp->un_tos);
615  
616 rlp = (struct rlalink *)((u_char *)(rlp + 1) +
617 ((rlp->un_tos.link.link_tos_count) * sizeof(union un_tos)));
618 }
619 break;
620  
621 case LS_TYPE_NETWORK:
622 ND_TCHECK(lsap->lsa_un.un_nla.nla_mask);
623 ND_PRINT((ndo, "\n\t Mask %s\n\t Connected Routers:",
624 ipaddr_string(ndo, &lsap->lsa_un.un_nla.nla_mask)));
625 ap = lsap->lsa_un.un_nla.nla_router;
626 while ((u_char *)ap < ls_end) {
627 ND_TCHECK(*ap);
628 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap)));
629 ++ap;
630 }
631 break;
632  
633 case LS_TYPE_SUM_IP:
634 ND_TCHECK(lsap->lsa_un.un_nla.nla_mask);
635 ND_PRINT((ndo, "\n\t Mask %s",
636 ipaddr_string(ndo, &lsap->lsa_un.un_sla.sla_mask)));
637 ND_TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
638 lp = lsap->lsa_un.un_sla.sla_tosmetric;
639 while ((u_char *)lp < ls_end) {
640 register uint32_t ul;
641  
642 ND_TCHECK(*lp);
643 ul = EXTRACT_32BITS(lp);
644 topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
645 ND_PRINT((ndo, "\n\t\ttopology %s(%u) metric %d",
646 tok2str(ospf_topology_values, "", topology),
647 topology,
648 ul & SLA_MASK_METRIC));
649 ++lp;
650 }
651 break;
652  
653 case LS_TYPE_SUM_ABR:
654 ND_TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
655 lp = lsap->lsa_un.un_sla.sla_tosmetric;
656 while ((u_char *)lp < ls_end) {
657 register uint32_t ul;
658  
659 ND_TCHECK(*lp);
660 ul = EXTRACT_32BITS(lp);
661 topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
662 ND_PRINT((ndo, "\n\t\ttopology %s(%u) metric %d",
663 tok2str(ospf_topology_values, "", topology),
664 topology,
665 ul & SLA_MASK_METRIC));
666 ++lp;
667 }
668 break;
669  
670 case LS_TYPE_ASE:
671 case LS_TYPE_NSSA: /* fall through - those LSAs share the same format */
672 ND_TCHECK(lsap->lsa_un.un_nla.nla_mask);
673 ND_PRINT((ndo, "\n\t Mask %s",
674 ipaddr_string(ndo, &lsap->lsa_un.un_asla.asla_mask)));
675  
676 ND_TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
677 almp = lsap->lsa_un.un_asla.asla_metric;
678 while ((u_char *)almp < ls_end) {
679 register uint32_t ul;
680  
681 ND_TCHECK(almp->asla_tosmetric);
682 ul = EXTRACT_32BITS(&almp->asla_tosmetric);
683 topology = ((ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS);
684 ND_PRINT((ndo, "\n\t\ttopology %s(%u), type %d, metric",
685 tok2str(ospf_topology_values, "", topology),
686 topology,
687 (ul & ASLA_FLAG_EXTERNAL) ? 2 : 1));
688 if ((ul & ASLA_MASK_METRIC) == 0xffffff)
689 ND_PRINT((ndo, " infinite"));
690 else
691 ND_PRINT((ndo, " %d", (ul & ASLA_MASK_METRIC)));
692  
693 ND_TCHECK(almp->asla_forward);
694 if (almp->asla_forward.s_addr) {
695 ND_PRINT((ndo, ", forward %s", ipaddr_string(ndo, &almp->asla_forward)));
696 }
697 ND_TCHECK(almp->asla_tag);
698 if (almp->asla_tag.s_addr) {
699 ND_PRINT((ndo, ", tag %s", ipaddr_string(ndo, &almp->asla_tag)));
700 }
701 ++almp;
702 }
703 break;
704  
705 case LS_TYPE_GROUP:
706 /* Multicast extensions as of 23 July 1991 */
707 mcp = lsap->lsa_un.un_mcla;
708 while ((u_char *)mcp < ls_end) {
709 ND_TCHECK(mcp->mcla_vid);
710 switch (EXTRACT_32BITS(&mcp->mcla_vtype)) {
711  
712 case MCLA_VERTEX_ROUTER:
713 ND_PRINT((ndo, "\n\t Router Router-ID %s",
714 ipaddr_string(ndo, &mcp->mcla_vid)));
715 break;
716  
717 case MCLA_VERTEX_NETWORK:
718 ND_PRINT((ndo, "\n\t Network Designated Router %s",
719 ipaddr_string(ndo, &mcp->mcla_vid)));
720 break;
721  
722 default:
723 ND_PRINT((ndo, "\n\t unknown VertexType (%u)",
724 EXTRACT_32BITS(&mcp->mcla_vtype)));
725 break;
726 }
727 ++mcp;
728 }
729 break;
730  
731 case LS_TYPE_OPAQUE_LL: /* fall through */
732 case LS_TYPE_OPAQUE_AL:
733 case LS_TYPE_OPAQUE_DW:
734  
735 switch (*(&lsap->ls_hdr.un_lsa_id.opaque_field.opaque_type)) {
736 case LS_OPAQUE_TYPE_RI:
737 tptr = (uint8_t *)(&lsap->lsa_un.un_ri_tlv.type);
738  
739 while (ls_length != 0) {
740 ND_TCHECK2(*tptr, 4);
741 if (ls_length < 4) {
742 ND_PRINT((ndo, "\n\t Remaining LS length %u < 4", ls_length));
743 return(ls_end);
744 }
745 tlv_type = EXTRACT_16BITS(tptr);
746 tlv_length = EXTRACT_16BITS(tptr+2);
747 tptr+=4;
748 ls_length-=4;
749  
750 ND_PRINT((ndo, "\n\t %s TLV (%u), length: %u, value: ",
751 tok2str(lsa_opaque_ri_tlv_values,"unknown",tlv_type),
752 tlv_type,
753 tlv_length));
754  
755 if (tlv_length > ls_length) {
756 ND_PRINT((ndo, "\n\t Bogus length %u > %u", tlv_length,
757 ls_length));
758 return(ls_end);
759 }
760 ND_TCHECK2(*tptr, tlv_length);
761 switch(tlv_type) {
762  
763 case LS_OPAQUE_RI_TLV_CAP:
764 if (tlv_length != 4) {
765 ND_PRINT((ndo, "\n\t Bogus length %u != 4", tlv_length));
766 return(ls_end);
767 }
768 ND_PRINT((ndo, "Capabilities: %s",
769 bittok2str(lsa_opaque_ri_tlv_cap_values, "Unknown", EXTRACT_32BITS(tptr))));
770 break;
771 default:
772 if (ndo->ndo_vflag <= 1) {
773 if (!print_unknown_data(ndo, tptr, "\n\t ", tlv_length))
774 return(ls_end);
775 }
776 break;
777  
778 }
779 tptr+=tlv_length;
780 ls_length-=tlv_length;
781 }
782 break;
783  
784 case LS_OPAQUE_TYPE_GRACE:
785 if (ospf_print_grace_lsa(ndo, (uint8_t *)(&lsap->lsa_un.un_grace_tlv.type),
786 ls_length) == -1) {
787 return(ls_end);
788 }
789 break;
790  
791 case LS_OPAQUE_TYPE_TE:
792 if (ospf_print_te_lsa(ndo, (uint8_t *)(&lsap->lsa_un.un_te_lsa_tlv.type),
793 ls_length) == -1) {
794 return(ls_end);
795 }
796 break;
797  
798 default:
799 if (ndo->ndo_vflag <= 1) {
800 if (!print_unknown_data(ndo, (uint8_t *)lsap->lsa_un.un_unknown,
801 "\n\t ", ls_length))
802 return(ls_end);
803 }
804 break;
805 }
806 }
807  
808 /* do we want to see an additionally hexdump ? */
809 if (ndo->ndo_vflag> 1)
810 if (!print_unknown_data(ndo, (uint8_t *)lsap->lsa_un.un_unknown,
811 "\n\t ", ls_length)) {
812 return(ls_end);
813 }
814  
815 return (ls_end);
816 trunc:
817 return (NULL);
818 }
819  
820 static int
821 ospf_decode_lls(netdissect_options *ndo,
822 register const struct ospfhdr *op, register u_int length)
823 {
824 register const u_char *dptr;
825 register const u_char *dataend;
826 register u_int length2;
827 register uint16_t lls_type, lls_len;
828 register uint32_t lls_flags;
829  
830 switch (op->ospf_type) {
831  
832 case OSPF_TYPE_HELLO:
833 if (!(op->ospf_hello.hello_options & OSPF_OPTION_L))
834 return (0);
835 break;
836  
837 case OSPF_TYPE_DD:
838 if (!(op->ospf_db.db_options & OSPF_OPTION_L))
839 return (0);
840 break;
841  
842 default:
843 return (0);
844 }
845  
846 /* dig deeper if LLS data is available; see RFC4813 */
847 length2 = EXTRACT_16BITS(&op->ospf_len);
848 dptr = (u_char *)op + length2;
849 dataend = (u_char *)op + length;
850  
851 if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
852 dptr = dptr + op->ospf_authdata[3];
853 length2 += op->ospf_authdata[3];
854 }
855 if (length2 >= length) {
856 ND_PRINT((ndo, "\n\t[LLS truncated]"));
857 return (1);
858 }
859 ND_TCHECK2(*dptr, 2);
860 ND_PRINT((ndo, "\n\t LLS: checksum: 0x%04x", (u_int)EXTRACT_16BITS(dptr)));
861  
862 dptr += 2;
863 ND_TCHECK2(*dptr, 2);
864 length2 = EXTRACT_16BITS(dptr);
865 ND_PRINT((ndo, ", length: %u", length2));
866  
867 dptr += 2;
868 ND_TCHECK(*dptr);
869 while (dptr < dataend) {
870 ND_TCHECK2(*dptr, 2);
871 lls_type = EXTRACT_16BITS(dptr);
872 ND_PRINT((ndo, "\n\t %s (%u)",
873 tok2str(ospf_lls_tlv_values,"Unknown TLV",lls_type),
874 lls_type));
875 dptr += 2;
876 ND_TCHECK2(*dptr, 2);
877 lls_len = EXTRACT_16BITS(dptr);
878 ND_PRINT((ndo, ", length: %u", lls_len));
879 dptr += 2;
880 switch (lls_type) {
881  
882 case OSPF_LLS_EO:
883 if (lls_len != 4) {
884 ND_PRINT((ndo, " [should be 4]"));
885 lls_len = 4;
886 }
887 ND_TCHECK2(*dptr, 4);
888 lls_flags = EXTRACT_32BITS(dptr);
889 ND_PRINT((ndo, "\n\t Options: 0x%08x [%s]", lls_flags,
890 bittok2str(ospf_lls_eo_options, "?", lls_flags)));
891  
892 break;
893  
894 case OSPF_LLS_MD5:
895 if (lls_len != 20) {
896 ND_PRINT((ndo, " [should be 20]"));
897 lls_len = 20;
898 }
899 ND_TCHECK2(*dptr, 4);
900 ND_PRINT((ndo, "\n\t Sequence number: 0x%08x", EXTRACT_32BITS(dptr)));
901 break;
902 }
903  
904 dptr += lls_len;
905 }
906  
907 return (0);
908 trunc:
909 return (1);
910 }
911  
912 static int
913 ospf_decode_v2(netdissect_options *ndo,
914 register const struct ospfhdr *op, register const u_char *dataend)
915 {
916 register const struct in_addr *ap;
917 register const struct lsr *lsrp;
918 register const struct lsa_hdr *lshp;
919 register const struct lsa *lsap;
920 register uint32_t lsa_count,lsa_count_max;
921  
922 switch (op->ospf_type) {
923  
924 case OSPF_TYPE_UMD:
925 /*
926 * Rob Coltun's special monitoring packets;
927 * do nothing
928 */
929 break;
930  
931 case OSPF_TYPE_HELLO:
932 ND_PRINT((ndo, "\n\tOptions [%s]",
933 bittok2str(ospf_option_values,"none",op->ospf_hello.hello_options)));
934  
935 ND_TCHECK(op->ospf_hello.hello_deadint);
936 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Mask %s, Priority %u",
937 EXTRACT_16BITS(&op->ospf_hello.hello_helloint),
938 EXTRACT_32BITS(&op->ospf_hello.hello_deadint),
939 ipaddr_string(ndo, &op->ospf_hello.hello_mask),
940 op->ospf_hello.hello_priority));
941  
942 ND_TCHECK(op->ospf_hello.hello_dr);
943 if (op->ospf_hello.hello_dr.s_addr != 0)
944 ND_PRINT((ndo, "\n\t Designated Router %s",
945 ipaddr_string(ndo, &op->ospf_hello.hello_dr)));
946  
947 ND_TCHECK(op->ospf_hello.hello_bdr);
948 if (op->ospf_hello.hello_bdr.s_addr != 0)
949 ND_PRINT((ndo, ", Backup Designated Router %s",
950 ipaddr_string(ndo, &op->ospf_hello.hello_bdr)));
951  
952 ap = op->ospf_hello.hello_neighbor;
953 if ((u_char *)ap < dataend)
954 ND_PRINT((ndo, "\n\t Neighbor List:"));
955 while ((u_char *)ap < dataend) {
956 ND_TCHECK(*ap);
957 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap)));
958 ++ap;
959 }
960 break; /* HELLO */
961  
962 case OSPF_TYPE_DD:
963 ND_TCHECK(op->ospf_db.db_options);
964 ND_PRINT((ndo, "\n\tOptions [%s]",
965 bittok2str(ospf_option_values, "none", op->ospf_db.db_options)));
966 ND_TCHECK(op->ospf_db.db_flags);
967 ND_PRINT((ndo, ", DD Flags [%s]",
968 bittok2str(ospf_dd_flag_values, "none", op->ospf_db.db_flags)));
969 ND_TCHECK(op->ospf_db.db_ifmtu);
970 if (op->ospf_db.db_ifmtu) {
971 ND_PRINT((ndo, ", MTU: %u", EXTRACT_16BITS(&op->ospf_db.db_ifmtu)));
972 }
973 ND_TCHECK(op->ospf_db.db_seq);
974 ND_PRINT((ndo, ", Sequence: 0x%08x", EXTRACT_32BITS(&op->ospf_db.db_seq)));
975  
976 /* Print all the LS adv's */
977 lshp = op->ospf_db.db_lshdr;
978 while (((u_char *)lshp < dataend) && ospf_print_lshdr(ndo, lshp) != -1) {
979 ++lshp;
980 }
981 break;
982  
983 case OSPF_TYPE_LS_REQ:
984 lsrp = op->ospf_lsr;
985 while ((u_char *)lsrp < dataend) {
986 ND_TCHECK(*lsrp);
987  
988 ND_PRINT((ndo, "\n\t Advertising Router: %s, %s LSA (%u)",
989 ipaddr_string(ndo, &lsrp->ls_router),
990 tok2str(lsa_values,"unknown",EXTRACT_32BITS(lsrp->ls_type)),
991 EXTRACT_32BITS(&lsrp->ls_type)));
992  
993 switch (EXTRACT_32BITS(lsrp->ls_type)) {
994 /* the LSA header for opaque LSAs was slightly changed */
995 case LS_TYPE_OPAQUE_LL:
996 case LS_TYPE_OPAQUE_AL:
997 case LS_TYPE_OPAQUE_DW:
998 ND_PRINT((ndo, ", Opaque-Type: %s LSA (%u), Opaque-ID: %u",
999 tok2str(lsa_opaque_values, "unknown",lsrp->un_ls_stateid.opaque_field.opaque_type),
1000 lsrp->un_ls_stateid.opaque_field.opaque_type,
1001 EXTRACT_24BITS(&lsrp->un_ls_stateid.opaque_field.opaque_id)));
1002 break;
1003 default:
1004 ND_PRINT((ndo, ", LSA-ID: %s",
1005 ipaddr_string(ndo, &lsrp->un_ls_stateid.ls_stateid)));
1006 break;
1007 }
1008  
1009 ++lsrp;
1010 }
1011 break;
1012  
1013 case OSPF_TYPE_LS_UPDATE:
1014 lsap = op->ospf_lsu.lsu_lsa;
1015 ND_TCHECK(op->ospf_lsu.lsu_count);
1016 lsa_count_max = EXTRACT_32BITS(&op->ospf_lsu.lsu_count);
1017 ND_PRINT((ndo, ", %d LSA%s", lsa_count_max, PLURAL_SUFFIX(lsa_count_max)));
1018 for (lsa_count=1;lsa_count <= lsa_count_max;lsa_count++) {
1019 ND_PRINT((ndo, "\n\t LSA #%u", lsa_count));
1020 lsap = (const struct lsa *)ospf_print_lsa(ndo, lsap);
1021 if (lsap == NULL)
1022 goto trunc;
1023 }
1024 break;
1025  
1026 case OSPF_TYPE_LS_ACK:
1027 lshp = op->ospf_lsa.lsa_lshdr;
1028 while (ospf_print_lshdr(ndo, lshp) != -1) {
1029 ++lshp;
1030 }
1031 break;
1032  
1033 default:
1034 break;
1035 }
1036 return (0);
1037 trunc:
1038 return (1);
1039 }
1040  
1041 void
1042 ospf_print(netdissect_options *ndo,
1043 register const u_char *bp, register u_int length,
1044 const u_char *bp2 _U_)
1045 {
1046 register const struct ospfhdr *op;
1047 register const u_char *dataend;
1048 register const char *cp;
1049  
1050 op = (struct ospfhdr *)bp;
1051  
1052 /* XXX Before we do anything else, strip off the MD5 trailer */
1053 ND_TCHECK(op->ospf_authtype);
1054 if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
1055 length -= OSPF_AUTH_MD5_LEN;
1056 ndo->ndo_snapend -= OSPF_AUTH_MD5_LEN;
1057 }
1058  
1059 /* If the type is valid translate it, or just print the type */
1060 /* value. If it's not valid, say so and return */
1061 ND_TCHECK(op->ospf_type);
1062 cp = tok2str(type2str, "unknown LS-type", op->ospf_type);
1063 ND_PRINT((ndo, "OSPFv%u, %s, length %u", op->ospf_version, cp, length));
1064 if (*cp == 'u')
1065 return;
1066  
1067 if (!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
1068 return;
1069 }
1070  
1071 ND_TCHECK(op->ospf_len);
1072 if (length != EXTRACT_16BITS(&op->ospf_len)) {
1073 ND_PRINT((ndo, " [len %d]", EXTRACT_16BITS(&op->ospf_len)));
1074 }
1075  
1076 if (length > EXTRACT_16BITS(&op->ospf_len)) {
1077 dataend = bp + EXTRACT_16BITS(&op->ospf_len);
1078 } else {
1079 dataend = bp + length;
1080 }
1081  
1082 ND_TCHECK(op->ospf_routerid);
1083 ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf_routerid)));
1084  
1085 ND_TCHECK(op->ospf_areaid);
1086 if (op->ospf_areaid.s_addr != 0)
1087 ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf_areaid)));
1088 else
1089 ND_PRINT((ndo, ", Backbone Area"));
1090  
1091 if (ndo->ndo_vflag) {
1092 /* Print authentication data (should we really do this?) */
1093 ND_TCHECK2(op->ospf_authdata[0], sizeof(op->ospf_authdata));
1094  
1095 ND_PRINT((ndo, ", Authentication Type: %s (%u)",
1096 tok2str(ospf_authtype_values, "unknown", EXTRACT_16BITS(&op->ospf_authtype)),
1097 EXTRACT_16BITS(&op->ospf_authtype)));
1098  
1099 switch (EXTRACT_16BITS(&op->ospf_authtype)) {
1100  
1101 case OSPF_AUTH_NONE:
1102 break;
1103  
1104 case OSPF_AUTH_SIMPLE:
1105 ND_PRINT((ndo, "\n\tSimple text password: "));
1106 safeputs(ndo, op->ospf_authdata, OSPF_AUTH_SIMPLE_LEN);
1107 break;
1108  
1109 case OSPF_AUTH_MD5:
1110 ND_PRINT((ndo, "\n\tKey-ID: %u, Auth-Length: %u, Crypto Sequence Number: 0x%08x",
1111 *((op->ospf_authdata) + 2),
1112 *((op->ospf_authdata) + 3),
1113 EXTRACT_32BITS((op->ospf_authdata) + 4)));
1114 break;
1115  
1116 default:
1117 return;
1118 }
1119 }
1120 /* Do rest according to version. */
1121 switch (op->ospf_version) {
1122  
1123 case 2:
1124 /* ospf version 2 */
1125 if (ospf_decode_v2(ndo, op, dataend))
1126 goto trunc;
1127 if (length > EXTRACT_16BITS(&op->ospf_len)) {
1128 if (ospf_decode_lls(ndo, op, length))
1129 goto trunc;
1130 }
1131 break;
1132  
1133 default:
1134 ND_PRINT((ndo, " ospf [version %d]", op->ospf_version));
1135 break;
1136 } /* end switch on version */
1137  
1138 return;
1139 trunc:
1140 ND_PRINT((ndo, "%s", tstr));
1141 }