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Use EXTRACT_nBITS even when just testing against zero.
[tcpdump] / print-ospf6.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 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #endif
27
28 #include <tcpdump-stdinc.h>
29
30 #include <stdio.h>
31 #include <string.h>
32
33 #include "interface.h"
34 #include "addrtoname.h"
35 #include "extract.h"
36
37 #include "ospf.h"
38
39 #define OSPF_TYPE_HELLO 1 /* Hello */
40 #define OSPF_TYPE_DD 2 /* Database Description */
41 #define OSPF_TYPE_LS_REQ 3 /* Link State Request */
42 #define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */
43 #define OSPF_TYPE_LS_ACK 5 /* Link State Ack */
44
45 /* Options *_options */
46 #define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */
47 #define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */
48 #define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */
49 #define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */
50 #define OSPF6_OPTION_R 0x10 /* R bit: Router bit */
51 #define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */
52 /* The field is actually 24-bit (RFC5340 Section A.2). */
53 #define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */
54 #define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */
55 #define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */
56
57
58 /* db_flags */
59 #define OSPF6_DB_INIT 0x04 /* */
60 #define OSPF6_DB_MORE 0x02
61 #define OSPF6_DB_MASTER 0x01
62 #define OSPF6_DB_M6 0x10 /* IPv6 MTU */
63
64 /* ls_type */
65 #define LS_TYPE_ROUTER 1 /* router link */
66 #define LS_TYPE_NETWORK 2 /* network link */
67 #define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */
68 #define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */
69 #define LS_TYPE_ASE 5 /* ASE */
70 #define LS_TYPE_GROUP 6 /* Group membership */
71 #define LS_TYPE_NSSA 7 /* NSSA */
72 #define LS_TYPE_LINK 8 /* Link LSA */
73 #define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */
74 #define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */
75 #define LS_TYPE_GRACE 11 /* Grace LSA */
76 #define LS_TYPE_RI 12 /* Router information */
77 #define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */
78 #define LS_TYPE_L1VPN 14 /* L1VPN */
79 #define LS_TYPE_MASK 0x1fff
80
81 #define LS_SCOPE_LINKLOCAL 0x0000
82 #define LS_SCOPE_AREA 0x2000
83 #define LS_SCOPE_AS 0x4000
84 #define LS_SCOPE_MASK 0x6000
85 #define LS_SCOPE_U 0x8000
86
87 /* rla_link.link_type */
88 #define RLA_TYPE_ROUTER 1 /* point-to-point to another router */
89 #define RLA_TYPE_TRANSIT 2 /* connection to transit network */
90 #define RLA_TYPE_VIRTUAL 4 /* virtual link */
91
92 /* rla_flags */
93 #define RLA_FLAG_B 0x01
94 #define RLA_FLAG_E 0x02
95 #define RLA_FLAG_V 0x04
96 #define RLA_FLAG_W 0x08
97 #define RLA_FLAG_N 0x10
98
99 /* lsa_prefix options */
100 #define LSA_PREFIX_OPT_NU 0x01
101 #define LSA_PREFIX_OPT_LA 0x02
102 #define LSA_PREFIX_OPT_MC 0x04
103 #define LSA_PREFIX_OPT_P 0x08
104 #define LSA_PREFIX_OPT_DN 0x10
105
106 /* sla_tosmetric breakdown */
107 #define SLA_MASK_TOS 0x7f000000
108 #define SLA_MASK_METRIC 0x00ffffff
109 #define SLA_SHIFT_TOS 24
110
111 /* asla_metric */
112 #define ASLA_FLAG_FWDADDR 0x02000000
113 #define ASLA_FLAG_ROUTETAG 0x01000000
114 #define ASLA_MASK_METRIC 0x00ffffff
115
116 /* RFC6506 Section 4.1 */
117 #define OSPF6_AT_HDRLEN 16U
118 #define OSPF6_AUTH_TYPE_HMAC 0x0001
119
120 typedef u_int32_t rtrid_t;
121
122 /* link state advertisement header */
123 struct lsa6_hdr {
124 u_int16_t ls_age;
125 u_int16_t ls_type;
126 rtrid_t ls_stateid;
127 rtrid_t ls_router;
128 u_int32_t ls_seq;
129 u_int16_t ls_chksum;
130 u_int16_t ls_length;
131 };
132
133 struct lsa6_prefix {
134 u_int8_t lsa_p_len;
135 u_int8_t lsa_p_opt;
136 u_int16_t lsa_p_metric;
137 u_int8_t lsa_p_prefix[4];
138 };
139
140 /* link state advertisement */
141 struct lsa6 {
142 struct lsa6_hdr ls_hdr;
143
144 /* Link state types */
145 union {
146 /* Router links advertisements */
147 struct {
148 union {
149 u_int8_t flg;
150 u_int32_t opt;
151 } rla_flgandopt;
152 #define rla_flags rla_flgandopt.flg
153 #define rla_options rla_flgandopt.opt
154 struct rlalink6 {
155 u_int8_t link_type;
156 u_int8_t link_zero[1];
157 u_int16_t link_metric;
158 u_int32_t link_ifid;
159 u_int32_t link_nifid;
160 rtrid_t link_nrtid;
161 } rla_link[1]; /* may repeat */
162 } un_rla;
163
164 /* Network links advertisements */
165 struct {
166 u_int32_t nla_options;
167 rtrid_t nla_router[1]; /* may repeat */
168 } un_nla;
169
170 /* Inter Area Prefix LSA */
171 struct {
172 u_int32_t inter_ap_metric;
173 struct lsa6_prefix inter_ap_prefix[1];
174 } un_inter_ap;
175
176 /* AS external links advertisements */
177 struct {
178 u_int32_t asla_metric;
179 struct lsa6_prefix asla_prefix[1];
180 /* some optional fields follow */
181 } un_asla;
182
183 #if 0
184 /* Summary links advertisements */
185 struct {
186 struct in_addr sla_mask;
187 u_int32_t sla_tosmetric[1]; /* may repeat */
188 } un_sla;
189
190 /* Multicast group membership */
191 struct mcla {
192 u_int32_t mcla_vtype;
193 struct in_addr mcla_vid;
194 } un_mcla[1];
195 #endif
196
197 /* Type 7 LSA */
198
199 /* Link LSA */
200 struct llsa {
201 union {
202 u_int8_t pri;
203 u_int32_t opt;
204 } llsa_priandopt;
205 #define llsa_priority llsa_priandopt.pri
206 #define llsa_options llsa_priandopt.opt
207 struct in6_addr llsa_lladdr;
208 u_int32_t llsa_nprefix;
209 struct lsa6_prefix llsa_prefix[1];
210 } un_llsa;
211
212 /* Intra-Area-Prefix */
213 struct {
214 u_int16_t intra_ap_nprefix;
215 u_int16_t intra_ap_lstype;
216 rtrid_t intra_ap_lsid;
217 rtrid_t intra_ap_rtid;
218 struct lsa6_prefix intra_ap_prefix[1];
219 } un_intra_ap;
220 } lsa_un;
221 };
222
223 /*
224 * the main header
225 */
226 struct ospf6hdr {
227 u_int8_t ospf6_version;
228 u_int8_t ospf6_type;
229 u_int16_t ospf6_len;
230 rtrid_t ospf6_routerid;
231 rtrid_t ospf6_areaid;
232 u_int16_t ospf6_chksum;
233 u_int8_t ospf6_instanceid;
234 u_int8_t ospf6_rsvd;
235 union {
236
237 /* Hello packet */
238 struct {
239 u_int32_t hello_ifid;
240 union {
241 u_int8_t pri;
242 u_int32_t opt;
243 } hello_priandopt;
244 #define hello_priority hello_priandopt.pri
245 #define hello_options hello_priandopt.opt
246 u_int16_t hello_helloint;
247 u_int16_t hello_deadint;
248 rtrid_t hello_dr;
249 rtrid_t hello_bdr;
250 rtrid_t hello_neighbor[1]; /* may repeat */
251 } un_hello;
252
253 /* Database Description packet */
254 struct {
255 u_int32_t db_options;
256 u_int16_t db_mtu;
257 u_int8_t db_mbz;
258 u_int8_t db_flags;
259 u_int32_t db_seq;
260 struct lsa6_hdr db_lshdr[1]; /* may repeat */
261 } un_db;
262
263 /* Link State Request */
264 struct lsr6 {
265 u_int16_t ls_mbz;
266 u_int16_t ls_type;
267 rtrid_t ls_stateid;
268 rtrid_t ls_router;
269 } un_lsr[1]; /* may repeat */
270
271 /* Link State Update */
272 struct {
273 u_int32_t lsu_count;
274 struct lsa6 lsu_lsa[1]; /* may repeat */
275 } un_lsu;
276
277 /* Link State Acknowledgement */
278 struct {
279 struct lsa6_hdr lsa_lshdr[1]; /* may repeat */
280 } un_lsa ;
281 } ospf6_un ;
282 };
283
284 #define ospf6_hello ospf6_un.un_hello
285 #define ospf6_db ospf6_un.un_db
286 #define ospf6_lsr ospf6_un.un_lsr
287 #define ospf6_lsu ospf6_un.un_lsu
288 #define ospf6_lsa ospf6_un.un_lsa
289
290 static const char tstr[] = " [|ospf3]";
291
292 static const struct tok ospf6_option_values[] = {
293 { OSPF6_OPTION_V6, "V6" },
294 { OSPF6_OPTION_E, "External" },
295 { OSPF6_OPTION_MC, "Deprecated" },
296 { OSPF6_OPTION_N, "NSSA" },
297 { OSPF6_OPTION_R, "Router" },
298 { OSPF6_OPTION_DC, "Demand Circuit" },
299 { OSPF6_OPTION_AF, "AFs Support" },
300 { OSPF6_OPTION_L, "LLS" },
301 { OSPF6_OPTION_AT, "Authentication Trailer" },
302 { 0, NULL }
303 };
304
305 static const struct tok ospf6_rla_flag_values[] = {
306 { RLA_FLAG_B, "ABR" },
307 { RLA_FLAG_E, "External" },
308 { RLA_FLAG_V, "Virtual-Link Endpoint" },
309 { RLA_FLAG_W, "Wildcard Receiver" },
310 { RLA_FLAG_N, "NSSA Translator" },
311 { 0, NULL }
312 };
313
314 static const struct tok ospf6_asla_flag_values[] = {
315 { ASLA_FLAG_EXTERNAL, "External Type 2" },
316 { ASLA_FLAG_FWDADDR, "Forwarding" },
317 { ASLA_FLAG_ROUTETAG, "Tag" },
318 { 0, NULL }
319 };
320
321 static const struct tok ospf6_type_values[] = {
322 { OSPF_TYPE_HELLO, "Hello" },
323 { OSPF_TYPE_DD, "Database Description" },
324 { OSPF_TYPE_LS_REQ, "LS-Request" },
325 { OSPF_TYPE_LS_UPDATE, "LS-Update" },
326 { OSPF_TYPE_LS_ACK, "LS-Ack" },
327 { 0, NULL }
328 };
329
330 static const struct tok ospf6_lsa_values[] = {
331 { LS_TYPE_ROUTER, "Router" },
332 { LS_TYPE_NETWORK, "Network" },
333 { LS_TYPE_INTER_AP, "Inter-Area Prefix" },
334 { LS_TYPE_INTER_AR, "Inter-Area Router" },
335 { LS_TYPE_ASE, "External" },
336 { LS_TYPE_GROUP, "Deprecated" },
337 { LS_TYPE_NSSA, "NSSA" },
338 { LS_TYPE_LINK, "Link" },
339 { LS_TYPE_INTRA_AP, "Intra-Area Prefix" },
340 { LS_TYPE_INTRA_ATE, "Intra-Area TE" },
341 { LS_TYPE_GRACE, "Grace" },
342 { LS_TYPE_RI, "Router Information" },
343 { LS_TYPE_INTER_ASTE, "Inter-AS-TE" },
344 { LS_TYPE_L1VPN, "Layer 1 VPN" },
345 { 0, NULL }
346 };
347
348 static const struct tok ospf6_ls_scope_values[] = {
349 { LS_SCOPE_LINKLOCAL, "Link Local" },
350 { LS_SCOPE_AREA, "Area Local" },
351 { LS_SCOPE_AS, "Domain Wide" },
352 { 0, NULL }
353 };
354
355 static const struct tok ospf6_dd_flag_values[] = {
356 { OSPF6_DB_INIT, "Init" },
357 { OSPF6_DB_MORE, "More" },
358 { OSPF6_DB_MASTER, "Master" },
359 { OSPF6_DB_M6, "IPv6 MTU" },
360 { 0, NULL }
361 };
362
363 static const struct tok ospf6_lsa_prefix_option_values[] = {
364 { LSA_PREFIX_OPT_NU, "No Unicast" },
365 { LSA_PREFIX_OPT_LA, "Local address" },
366 { LSA_PREFIX_OPT_MC, "Deprecated" },
367 { LSA_PREFIX_OPT_P, "Propagate" },
368 { LSA_PREFIX_OPT_DN, "Down" },
369 { 0, NULL }
370 };
371
372 static const struct tok ospf6_auth_type_str[] = {
373 { OSPF6_AUTH_TYPE_HMAC, "HMAC" },
374 { 0, NULL }
375 };
376
377 static void
378 ospf6_print_ls_type(register u_int ls_type, register const rtrid_t *ls_stateid)
379 {
380 printf("\n\t %s LSA (%d), %s Scope%s, LSA-ID %s",
381 tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK),
382 ls_type & LS_TYPE_MASK,
383 tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK),
384 ls_type &0x8000 ? ", transitive" : "", /* U-bit */
385 ipaddr_string(ls_stateid));
386 }
387
388 static int
389 ospf6_print_lshdr(register const struct lsa6_hdr *lshp, const u_char *dataend)
390 {
391 if ((u_char *)(lshp + 1) > dataend)
392 goto trunc;
393 TCHECK(lshp->ls_type);
394 TCHECK(lshp->ls_seq);
395
396 printf("\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
397 ipaddr_string(&lshp->ls_router),
398 EXTRACT_32BITS(&lshp->ls_seq),
399 EXTRACT_16BITS(&lshp->ls_age),
400 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr));
401
402 ospf6_print_ls_type(EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid);
403
404 return (0);
405 trunc:
406 return (1);
407 }
408
409 static int
410 ospf6_print_lsaprefix(const u_int8_t *tptr, u_int lsa_length)
411 {
412 const struct lsa6_prefix *lsapp = (struct lsa6_prefix *)tptr;
413 u_int wordlen;
414 struct in6_addr prefix;
415
416 if (lsa_length < sizeof (*lsapp) - 4)
417 goto trunc;
418 lsa_length -= sizeof (*lsapp) - 4;
419 TCHECK2(*lsapp, sizeof (*lsapp) - 4);
420 wordlen = (lsapp->lsa_p_len + 31) / 32;
421 if (wordlen * 4 > sizeof(struct in6_addr)) {
422 printf(" bogus prefixlen /%d", lsapp->lsa_p_len);
423 goto trunc;
424 }
425 if (lsa_length < wordlen * 4)
426 goto trunc;
427 lsa_length -= wordlen * 4;
428 TCHECK2(lsapp->lsa_p_prefix, wordlen * 4);
429 memset(&prefix, 0, sizeof(prefix));
430 memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4);
431 printf("\n\t\t%s/%d", ip6addr_string(&prefix),
432 lsapp->lsa_p_len);
433 if (lsapp->lsa_p_opt) {
434 printf(", Options [%s]",
435 bittok2str(ospf6_lsa_prefix_option_values,
436 "none", lsapp->lsa_p_opt));
437 }
438 printf(", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric));
439 return sizeof(*lsapp) - 4 + wordlen * 4;
440
441 trunc:
442 return -1;
443 }
444
445
446 /*
447 * Print a single link state advertisement. If truncated return 1, else 0.
448 */
449 static int
450 ospf6_print_lsa(register const struct lsa6 *lsap, const u_char *dataend)
451 {
452 register const struct rlalink6 *rlp;
453 #if 0
454 register const struct tos_metric *tosp;
455 #endif
456 register const rtrid_t *ap;
457 #if 0
458 register const struct aslametric *almp;
459 register const struct mcla *mcp;
460 #endif
461 register const struct llsa *llsap;
462 register const struct lsa6_prefix *lsapp;
463 #if 0
464 register const u_int32_t *lp;
465 #endif
466 register u_int prefixes;
467 register int bytelen;
468 register u_int length, lsa_length;
469 u_int32_t flags32;
470 const u_int8_t *tptr;
471
472 if (ospf6_print_lshdr(&lsap->ls_hdr, dataend))
473 return (1);
474 TCHECK(lsap->ls_hdr.ls_length);
475 length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length);
476
477 /*
478 * The LSA length includes the length of the header;
479 * it must have a value that's at least that length.
480 * If it does, find the length of what follows the
481 * header.
482 */
483 if (length < sizeof(struct lsa6_hdr) || (u_char *)lsap + length > dataend)
484 return (1);
485 lsa_length = length - sizeof(struct lsa6_hdr);
486 tptr = (u_int8_t *)lsap+sizeof(struct lsa6_hdr);
487
488 switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) {
489 case LS_TYPE_ROUTER | LS_SCOPE_AREA:
490 if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options))
491 return (1);
492 lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options);
493 TCHECK(lsap->lsa_un.un_rla.rla_options);
494 printf("\n\t Options [%s]",
495 bittok2str(ospf6_option_values, "none",
496 EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options)));
497 printf(", RLA-Flags [%s]",
498 bittok2str(ospf6_rla_flag_values, "none",
499 lsap->lsa_un.un_rla.rla_flags));
500
501 rlp = lsap->lsa_un.un_rla.rla_link;
502 while (lsa_length != 0) {
503 if (lsa_length < sizeof (*rlp))
504 return (1);
505 lsa_length -= sizeof (*rlp);
506 TCHECK(*rlp);
507 switch (rlp->link_type) {
508
509 case RLA_TYPE_VIRTUAL:
510 printf("\n\t Virtual Link: Neighbor Router-ID %s"
511 "\n\t Neighbor Interface-ID %s, Interface %s",
512 ipaddr_string(&rlp->link_nrtid),
513 ipaddr_string(&rlp->link_nifid),
514 ipaddr_string(&rlp->link_ifid));
515 break;
516
517 case RLA_TYPE_ROUTER:
518 printf("\n\t Neighbor Router-ID %s"
519 "\n\t Neighbor Interface-ID %s, Interface %s",
520 ipaddr_string(&rlp->link_nrtid),
521 ipaddr_string(&rlp->link_nifid),
522 ipaddr_string(&rlp->link_ifid));
523 break;
524
525 case RLA_TYPE_TRANSIT:
526 printf("\n\t Neighbor Network-ID %s"
527 "\n\t Neighbor Interface-ID %s, Interface %s",
528 ipaddr_string(&rlp->link_nrtid),
529 ipaddr_string(&rlp->link_nifid),
530 ipaddr_string(&rlp->link_ifid));
531 break;
532
533 default:
534 printf("\n\t Unknown Router Links Type 0x%02x",
535 rlp->link_type);
536 return (0);
537 }
538 printf(", metric %d", EXTRACT_16BITS(&rlp->link_metric));
539 rlp++;
540 }
541 break;
542
543 case LS_TYPE_NETWORK | LS_SCOPE_AREA:
544 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options))
545 return (1);
546 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options);
547 TCHECK(lsap->lsa_un.un_nla.nla_options);
548 printf("\n\t Options [%s]",
549 bittok2str(ospf6_option_values, "none",
550 EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options)));
551
552 printf("\n\t Connected Routers:");
553 ap = lsap->lsa_un.un_nla.nla_router;
554 while (lsa_length != 0) {
555 if (lsa_length < sizeof (*ap))
556 return (1);
557 lsa_length -= sizeof (*ap);
558 TCHECK(*ap);
559 printf("\n\t\t%s", ipaddr_string(ap));
560 ++ap;
561 }
562 break;
563
564 case LS_TYPE_INTER_AP | LS_SCOPE_AREA:
565 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric))
566 return (1);
567 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric);
568 TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric);
569 printf(", metric %u",
570 EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC);
571
572 tptr = (u_int8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix;
573 while (lsa_length != 0) {
574 bytelen = ospf6_print_lsaprefix(tptr, lsa_length);
575 if (bytelen < 0)
576 goto trunc;
577 lsa_length -= bytelen;
578 tptr += bytelen;
579 }
580 break;
581
582 case LS_TYPE_ASE | LS_SCOPE_AS:
583 if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric))
584 return (1);
585 lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric);
586 TCHECK(lsap->lsa_un.un_asla.asla_metric);
587 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric);
588 printf("\n\t Flags [%s]",
589 bittok2str(ospf6_asla_flag_values, "none", flags32));
590 printf(" metric %u",
591 EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) &
592 ASLA_MASK_METRIC);
593
594 tptr = (u_int8_t *)lsap->lsa_un.un_asla.asla_prefix;
595 lsapp = (struct lsa6_prefix *)tptr;
596 bytelen = ospf6_print_lsaprefix(tptr, lsa_length);
597 if (bytelen < 0)
598 goto trunc;
599 lsa_length -= bytelen;
600 tptr += bytelen;
601
602 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
603 struct in6_addr *fwdaddr6;
604
605 fwdaddr6 = (struct in6_addr *)tptr;
606 if (lsa_length < sizeof (*fwdaddr6))
607 return (1);
608 lsa_length -= sizeof (*fwdaddr6);
609 TCHECK(*fwdaddr6);
610 printf(" forward %s",
611 ip6addr_string(fwdaddr6));
612 tptr += sizeof(*fwdaddr6);
613 }
614
615 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
616 if (lsa_length < sizeof (u_int32_t))
617 return (1);
618 lsa_length -= sizeof (u_int32_t);
619 TCHECK(*(u_int32_t *)tptr);
620 printf(" tag %s",
621 ipaddr_string((u_int32_t *)tptr));
622 tptr += sizeof(u_int32_t);
623 }
624
625 if (lsapp->lsa_p_metric) {
626 if (lsa_length < sizeof (u_int32_t))
627 return (1);
628 lsa_length -= sizeof (u_int32_t);
629 TCHECK(*(u_int32_t *)tptr);
630 printf(" RefLSID: %s",
631 ipaddr_string((u_int32_t *)tptr));
632 tptr += sizeof(u_int32_t);
633 }
634 break;
635
636 case LS_TYPE_LINK:
637 /* Link LSA */
638 llsap = &lsap->lsa_un.un_llsa;
639 if (lsa_length < sizeof (llsap->llsa_priandopt))
640 return (1);
641 lsa_length -= sizeof (llsap->llsa_priandopt);
642 TCHECK(llsap->llsa_priandopt);
643 printf("\n\t Options [%s]",
644 bittok2str(ospf6_option_values, "none",
645 EXTRACT_32BITS(&llsap->llsa_options)));
646
647 if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix))
648 return (1);
649 lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix);
650 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix);
651 printf("\n\t Priority %d, Link-local address %s, Prefixes %d:",
652 llsap->llsa_priority,
653 ip6addr_string(&llsap->llsa_lladdr),
654 prefixes);
655
656 tptr = (u_int8_t *)llsap->llsa_prefix;
657 while (prefixes > 0) {
658 bytelen = ospf6_print_lsaprefix(tptr, lsa_length);
659 if (bytelen < 0)
660 goto trunc;
661 prefixes--;
662 lsa_length -= bytelen;
663 tptr += bytelen;
664 }
665 break;
666
667 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA:
668 /* Intra-Area-Prefix LSA */
669 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid))
670 return (1);
671 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid);
672 TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
673 ospf6_print_ls_type(
674 EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype),
675 &lsap->lsa_un.un_intra_ap.intra_ap_lsid);
676
677 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix))
678 return (1);
679 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
680 TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
681 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
682 printf("\n\t Prefixes %d:", prefixes);
683
684 tptr = (u_int8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
685 while (prefixes > 0) {
686 bytelen = ospf6_print_lsaprefix(tptr, lsa_length);
687 if (bytelen < 0)
688 goto trunc;
689 prefixes--;
690 lsa_length -= bytelen;
691 tptr += bytelen;
692 }
693 break;
694
695 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
696 if (ospf_print_grace_lsa(tptr, lsa_length) == -1) {
697 return 1;
698 }
699 break;
700
701 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
702 if (ospf_print_te_lsa(tptr, lsa_length) == -1) {
703 return 1;
704 }
705 break;
706
707 default:
708 if(!print_unknown_data(gndo,tptr,
709 "\n\t ",
710 lsa_length)) {
711 return (1);
712 }
713 break;
714 }
715
716 return (0);
717 trunc:
718 return (1);
719 }
720
721 static int
722 ospf6_decode_v3(register const struct ospf6hdr *op,
723 register const u_char *dataend)
724 {
725 register const rtrid_t *ap;
726 register const struct lsr6 *lsrp;
727 register const struct lsa6_hdr *lshp;
728 register const struct lsa6 *lsap;
729 register int i;
730
731 switch (op->ospf6_type) {
732
733 case OSPF_TYPE_HELLO:
734 printf("\n\tOptions [%s]",
735 bittok2str(ospf6_option_values, "none",
736 EXTRACT_32BITS(&op->ospf6_hello.hello_options)));
737
738 TCHECK(op->ospf6_hello.hello_deadint);
739 printf("\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
740 EXTRACT_16BITS(&op->ospf6_hello.hello_helloint),
741 EXTRACT_16BITS(&op->ospf6_hello.hello_deadint),
742 ipaddr_string(&op->ospf6_hello.hello_ifid),
743 op->ospf6_hello.hello_priority);
744
745 TCHECK(op->ospf6_hello.hello_dr);
746 if (op->ospf6_hello.hello_dr != 0)
747 printf("\n\t Designated Router %s",
748 ipaddr_string(&op->ospf6_hello.hello_dr));
749 TCHECK(op->ospf6_hello.hello_bdr);
750 if (op->ospf6_hello.hello_bdr != 0)
751 printf(", Backup Designated Router %s",
752 ipaddr_string(&op->ospf6_hello.hello_bdr));
753 if (vflag > 1) {
754 printf("\n\t Neighbor List:");
755 ap = op->ospf6_hello.hello_neighbor;
756 while ((u_char *)ap < dataend) {
757 TCHECK(*ap);
758 printf("\n\t %s", ipaddr_string(ap));
759 ++ap;
760 }
761 }
762 break; /* HELLO */
763
764 case OSPF_TYPE_DD:
765 TCHECK(op->ospf6_db.db_options);
766 printf("\n\tOptions [%s]",
767 bittok2str(ospf6_option_values, "none",
768 EXTRACT_32BITS(&op->ospf6_db.db_options)));
769 TCHECK(op->ospf6_db.db_flags);
770 printf(", DD Flags [%s]",
771 bittok2str(ospf6_dd_flag_values,"none",op->ospf6_db.db_flags));
772
773 TCHECK(op->ospf6_db.db_seq);
774 printf(", MTU %u, DD-Sequence 0x%08x",
775 EXTRACT_16BITS(&op->ospf6_db.db_mtu),
776 EXTRACT_32BITS(&op->ospf6_db.db_seq));
777 if (vflag > 1) {
778 /* Print all the LS adv's */
779 lshp = op->ospf6_db.db_lshdr;
780 while ((u_char *)lshp < dataend) {
781 if (ospf6_print_lshdr(lshp++, dataend))
782 goto trunc;
783 }
784 }
785 break;
786
787 case OSPF_TYPE_LS_REQ:
788 if (vflag > 1) {
789 lsrp = op->ospf6_lsr;
790 while ((u_char *)lsrp < dataend) {
791 TCHECK(*lsrp);
792 printf("\n\t Advertising Router %s",
793 ipaddr_string(&lsrp->ls_router));
794 ospf6_print_ls_type(EXTRACT_16BITS(&lsrp->ls_type),
795 &lsrp->ls_stateid);
796 ++lsrp;
797 }
798 }
799 break;
800
801 case OSPF_TYPE_LS_UPDATE:
802 if (vflag > 1) {
803 lsap = op->ospf6_lsu.lsu_lsa;
804 TCHECK(op->ospf6_lsu.lsu_count);
805 i = EXTRACT_32BITS(&op->ospf6_lsu.lsu_count);
806 while ((u_char *)lsap < dataend && i--) {
807 if (ospf6_print_lsa(lsap, dataend))
808 goto trunc;
809 lsap = (struct lsa6 *)((u_char *)lsap +
810 EXTRACT_16BITS(&lsap->ls_hdr.ls_length));
811 }
812 }
813 break;
814
815
816 case OSPF_TYPE_LS_ACK:
817 if (vflag > 1) {
818 lshp = op->ospf6_lsa.lsa_lshdr;
819 while ((u_char *)lshp < dataend) {
820 if (ospf6_print_lshdr(lshp++, dataend))
821 goto trunc;
822 }
823 }
824 break;
825
826 default:
827 break;
828 }
829 return (0);
830 trunc:
831 return (1);
832 }
833
834 /* RFC5613 Section 2.2 (w/o the TLVs) */
835 static int
836 ospf6_print_lls(const u_char *cp, const u_int len)
837 {
838 uint16_t llsdatalen;
839
840 if (len == 0)
841 return 0;
842 if (len < OSPF_LLS_HDRLEN)
843 goto trunc;
844 /* Checksum */
845 TCHECK2(*cp, 2);
846 printf("\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp));
847 cp += 2;
848 /* LLS Data Length */
849 TCHECK2(*cp, 2);
850 llsdatalen = EXTRACT_16BITS(cp);
851 printf(", Data Length %u", llsdatalen);
852 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
853 goto trunc;
854 cp += 2;
855 /* LLS TLVs */
856 TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN);
857 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */
858
859 return llsdatalen;
860 trunc:
861 return -1;
862 }
863
864 /* RFC6506 Section 4.1 */
865 static int
866 ospf6_decode_at(const u_char *cp, const u_int len)
867 {
868 uint16_t authdatalen;
869
870 if (len == 0)
871 return 0;
872 if (len < OSPF6_AT_HDRLEN)
873 goto trunc;
874 /* Authentication Type */
875 TCHECK2(*cp, 2);
876 printf("\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp)));
877 cp += 2;
878 /* Auth Data Len */
879 TCHECK2(*cp, 2);
880 authdatalen = EXTRACT_16BITS(cp);
881 printf(", Length %u", authdatalen);
882 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
883 goto trunc;
884 cp += 2;
885 /* Reserved */
886 TCHECK2(*cp, 2);
887 cp += 2;
888 /* Security Association ID */
889 TCHECK2(*cp, 2);
890 printf(", SAID %u", EXTRACT_16BITS(cp));
891 cp += 2;
892 /* Cryptographic Sequence Number (High-Order 32 Bits) */
893 TCHECK2(*cp, 4);
894 printf(", CSN 0x%08x", EXTRACT_32BITS(cp));
895 cp += 4;
896 /* Cryptographic Sequence Number (Low-Order 32 Bits) */
897 TCHECK2(*cp, 4);
898 printf(":%08x", EXTRACT_32BITS(cp));
899 cp += 4;
900 /* Authentication Data */
901 TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN);
902 if (vflag > 1)
903 print_unknown_data(gndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN);
904 return 0;
905
906 trunc:
907 return 1;
908 }
909
910 /* The trailing data may include LLS and/or AT data (in this specific order).
911 * LLS data may be present only in Hello and DBDesc packets with the L-bit set.
912 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in
913 * any other packet type, thus decode the AT data regardless of the AT-bit.
914 */
915 static int
916 ospf6_decode_v3_trailer(const struct ospf6hdr *op, const u_char *cp, const unsigned len)
917 {
918 int llslen = 0;
919 u_char lls_hello = op->ospf6_type == OSPF_TYPE_HELLO &&
920 op->ospf6_hello.hello_options & OSPF6_OPTION_L;
921 u_char lls_dd = op->ospf6_type == OSPF_TYPE_DD &&
922 op->ospf6_db.db_options & OSPF6_OPTION_L;
923
924 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(cp, len)) < 0)
925 goto trunc;
926 return ospf6_decode_at(cp + llslen, len - llslen);
927
928 trunc:
929 return 1;
930 }
931
932 void
933 ospf6_print(register const u_char *bp, register u_int length)
934 {
935 register const struct ospf6hdr *op;
936 register const u_char *dataend;
937 register const char *cp;
938 uint16_t datalen;
939
940 op = (struct ospf6hdr *)bp;
941
942 /* If the type is valid translate it, or just print the type */
943 /* value. If it's not valid, say so and return */
944 TCHECK(op->ospf6_type);
945 cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type);
946 printf("OSPFv%u, %s, length %d", op->ospf6_version, cp, length);
947 if (*cp == 'u') {
948 return;
949 }
950
951 if(!vflag) { /* non verbose - so lets bail out here */
952 return;
953 }
954
955 /* OSPFv3 data always comes first and optional trailing data may follow. */
956 TCHECK(op->ospf6_len);
957 datalen = EXTRACT_16BITS(&op->ospf6_len);
958 if (datalen > length) {
959 printf(" [len %d]", datalen);
960 return;
961 }
962 dataend = bp + datalen;
963
964 TCHECK(op->ospf6_routerid);
965 printf("\n\tRouter-ID %s", ipaddr_string(&op->ospf6_routerid));
966
967 TCHECK(op->ospf6_areaid);
968 if (op->ospf6_areaid != 0)
969 printf(", Area %s", ipaddr_string(&op->ospf6_areaid));
970 else
971 printf(", Backbone Area");
972 TCHECK(op->ospf6_instanceid);
973 if (op->ospf6_instanceid)
974 printf(", Instance %u", op->ospf6_instanceid);
975
976 /* Do rest according to version. */
977 switch (op->ospf6_version) {
978
979 case 3:
980 /* ospf version 3 */
981 if (ospf6_decode_v3(op, dataend) ||
982 ospf6_decode_v3_trailer(op, dataend, length - datalen))
983 goto trunc;
984 break;
985 } /* end switch on version */
986
987 return;
988 trunc:
989 fputs(tstr, stdout);
990 }
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