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Fix a bunch of de-constifications.
[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 <string.h>
31
32 #include "interface.h"
33 #include "addrtoname.h"
34 #include "extract.h"
35
36 #include "ospf.h"
37
38 #define OSPF_TYPE_HELLO 1 /* Hello */
39 #define OSPF_TYPE_DD 2 /* Database Description */
40 #define OSPF_TYPE_LS_REQ 3 /* Link State Request */
41 #define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */
42 #define OSPF_TYPE_LS_ACK 5 /* Link State Ack */
43
44 /* Options *_options */
45 #define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */
46 #define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */
47 #define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */
48 #define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */
49 #define OSPF6_OPTION_R 0x10 /* R bit: Router bit */
50 #define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */
51 /* The field is actually 24-bit (RFC5340 Section A.2). */
52 #define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */
53 #define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */
54 #define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */
55
56
57 /* db_flags */
58 #define OSPF6_DB_INIT 0x04 /* */
59 #define OSPF6_DB_MORE 0x02
60 #define OSPF6_DB_MASTER 0x01
61 #define OSPF6_DB_M6 0x10 /* IPv6 MTU */
62
63 /* ls_type */
64 #define LS_TYPE_ROUTER 1 /* router link */
65 #define LS_TYPE_NETWORK 2 /* network link */
66 #define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */
67 #define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */
68 #define LS_TYPE_ASE 5 /* ASE */
69 #define LS_TYPE_GROUP 6 /* Group membership */
70 #define LS_TYPE_NSSA 7 /* NSSA */
71 #define LS_TYPE_LINK 8 /* Link LSA */
72 #define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */
73 #define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */
74 #define LS_TYPE_GRACE 11 /* Grace LSA */
75 #define LS_TYPE_RI 12 /* Router information */
76 #define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */
77 #define LS_TYPE_L1VPN 14 /* L1VPN */
78 #define LS_TYPE_MASK 0x1fff
79
80 #define LS_SCOPE_LINKLOCAL 0x0000
81 #define LS_SCOPE_AREA 0x2000
82 #define LS_SCOPE_AS 0x4000
83 #define LS_SCOPE_MASK 0x6000
84 #define LS_SCOPE_U 0x8000
85
86 /* rla_link.link_type */
87 #define RLA_TYPE_ROUTER 1 /* point-to-point to another router */
88 #define RLA_TYPE_TRANSIT 2 /* connection to transit network */
89 #define RLA_TYPE_VIRTUAL 4 /* virtual link */
90
91 /* rla_flags */
92 #define RLA_FLAG_B 0x01
93 #define RLA_FLAG_E 0x02
94 #define RLA_FLAG_V 0x04
95 #define RLA_FLAG_W 0x08
96 #define RLA_FLAG_N 0x10
97
98 /* lsa_prefix options */
99 #define LSA_PREFIX_OPT_NU 0x01
100 #define LSA_PREFIX_OPT_LA 0x02
101 #define LSA_PREFIX_OPT_MC 0x04
102 #define LSA_PREFIX_OPT_P 0x08
103 #define LSA_PREFIX_OPT_DN 0x10
104
105 /* sla_tosmetric breakdown */
106 #define SLA_MASK_TOS 0x7f000000
107 #define SLA_MASK_METRIC 0x00ffffff
108 #define SLA_SHIFT_TOS 24
109
110 /* asla_metric */
111 #define ASLA_FLAG_FWDADDR 0x02000000
112 #define ASLA_FLAG_ROUTETAG 0x01000000
113 #define ASLA_MASK_METRIC 0x00ffffff
114
115 /* RFC6506 Section 4.1 */
116 #define OSPF6_AT_HDRLEN 16U
117 #define OSPF6_AUTH_TYPE_HMAC 0x0001
118
119 typedef uint32_t rtrid_t;
120
121 /* link state advertisement header */
122 struct lsa6_hdr {
123 uint16_t ls_age;
124 uint16_t ls_type;
125 rtrid_t ls_stateid;
126 rtrid_t ls_router;
127 uint32_t ls_seq;
128 uint16_t ls_chksum;
129 uint16_t ls_length;
130 };
131
132 /* Length of an IPv6 address, in bytes. */
133 #define IPV6_ADDR_LEN_BYTES (128/8)
134
135 struct lsa6_prefix {
136 uint8_t lsa_p_len;
137 uint8_t lsa_p_opt;
138 uint16_t lsa_p_metric;
139 uint8_t lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */
140 };
141
142 /* link state advertisement */
143 struct lsa6 {
144 struct lsa6_hdr ls_hdr;
145
146 /* Link state types */
147 union {
148 /* Router links advertisements */
149 struct {
150 union {
151 uint8_t flg;
152 uint32_t opt;
153 } rla_flgandopt;
154 #define rla_flags rla_flgandopt.flg
155 #define rla_options rla_flgandopt.opt
156 struct rlalink6 {
157 uint8_t link_type;
158 uint8_t link_zero[1];
159 uint16_t link_metric;
160 uint32_t link_ifid;
161 uint32_t link_nifid;
162 rtrid_t link_nrtid;
163 } rla_link[1]; /* may repeat */
164 } un_rla;
165
166 /* Network links advertisements */
167 struct {
168 uint32_t nla_options;
169 rtrid_t nla_router[1]; /* may repeat */
170 } un_nla;
171
172 /* Inter Area Prefix LSA */
173 struct {
174 uint32_t inter_ap_metric;
175 struct lsa6_prefix inter_ap_prefix[1];
176 } un_inter_ap;
177
178 /* AS external links advertisements */
179 struct {
180 uint32_t asla_metric;
181 struct lsa6_prefix asla_prefix[1];
182 /* some optional fields follow */
183 } un_asla;
184
185 #if 0
186 /* Summary links advertisements */
187 struct {
188 struct in_addr sla_mask;
189 uint32_t sla_tosmetric[1]; /* may repeat */
190 } un_sla;
191
192 /* Multicast group membership */
193 struct mcla {
194 uint32_t mcla_vtype;
195 struct in_addr mcla_vid;
196 } un_mcla[1];
197 #endif
198
199 /* Type 7 LSA */
200
201 /* Link LSA */
202 struct llsa {
203 union {
204 uint8_t pri;
205 uint32_t opt;
206 } llsa_priandopt;
207 #define llsa_priority llsa_priandopt.pri
208 #define llsa_options llsa_priandopt.opt
209 struct in6_addr llsa_lladdr;
210 uint32_t llsa_nprefix;
211 struct lsa6_prefix llsa_prefix[1];
212 } un_llsa;
213
214 /* Intra-Area-Prefix */
215 struct {
216 uint16_t intra_ap_nprefix;
217 uint16_t intra_ap_lstype;
218 rtrid_t intra_ap_lsid;
219 rtrid_t intra_ap_rtid;
220 struct lsa6_prefix intra_ap_prefix[1];
221 } un_intra_ap;
222 } lsa_un;
223 };
224
225 /*
226 * the main header
227 */
228 struct ospf6hdr {
229 uint8_t ospf6_version;
230 uint8_t ospf6_type;
231 uint16_t ospf6_len;
232 rtrid_t ospf6_routerid;
233 rtrid_t ospf6_areaid;
234 uint16_t ospf6_chksum;
235 uint8_t ospf6_instanceid;
236 uint8_t ospf6_rsvd;
237 };
238
239 /*
240 * The OSPF6 header length is 16 bytes, regardless of how your compiler
241 * might choose to pad the above structure.
242 */
243 #define OSPF6HDR_LEN 16
244
245 /* Hello packet */
246 struct hello6 {
247 uint32_t hello_ifid;
248 union {
249 uint8_t pri;
250 uint32_t opt;
251 } hello_priandopt;
252 #define hello_priority hello_priandopt.pri
253 #define hello_options hello_priandopt.opt
254 uint16_t hello_helloint;
255 uint16_t hello_deadint;
256 rtrid_t hello_dr;
257 rtrid_t hello_bdr;
258 rtrid_t hello_neighbor[1]; /* may repeat */
259 };
260
261 /* Database Description packet */
262 struct dd6 {
263 uint32_t db_options;
264 uint16_t db_mtu;
265 uint8_t db_mbz;
266 uint8_t db_flags;
267 uint32_t db_seq;
268 struct lsa6_hdr db_lshdr[1]; /* may repeat */
269 };
270
271 /* Link State Request */
272 struct lsr6 {
273 uint16_t ls_mbz;
274 uint16_t ls_type;
275 rtrid_t ls_stateid;
276 rtrid_t ls_router;
277 };
278
279 /* Link State Update */
280 struct lsu6 {
281 uint32_t lsu_count;
282 struct lsa6 lsu_lsa[1]; /* may repeat */
283 };
284
285 static const char tstr[] = " [|ospf3]";
286
287 static const struct tok ospf6_option_values[] = {
288 { OSPF6_OPTION_V6, "V6" },
289 { OSPF6_OPTION_E, "External" },
290 { OSPF6_OPTION_MC, "Deprecated" },
291 { OSPF6_OPTION_N, "NSSA" },
292 { OSPF6_OPTION_R, "Router" },
293 { OSPF6_OPTION_DC, "Demand Circuit" },
294 { OSPF6_OPTION_AF, "AFs Support" },
295 { OSPF6_OPTION_L, "LLS" },
296 { OSPF6_OPTION_AT, "Authentication Trailer" },
297 { 0, NULL }
298 };
299
300 static const struct tok ospf6_rla_flag_values[] = {
301 { RLA_FLAG_B, "ABR" },
302 { RLA_FLAG_E, "External" },
303 { RLA_FLAG_V, "Virtual-Link Endpoint" },
304 { RLA_FLAG_W, "Wildcard Receiver" },
305 { RLA_FLAG_N, "NSSA Translator" },
306 { 0, NULL }
307 };
308
309 static const struct tok ospf6_asla_flag_values[] = {
310 { ASLA_FLAG_EXTERNAL, "External Type 2" },
311 { ASLA_FLAG_FWDADDR, "Forwarding" },
312 { ASLA_FLAG_ROUTETAG, "Tag" },
313 { 0, NULL }
314 };
315
316 static const struct tok ospf6_type_values[] = {
317 { OSPF_TYPE_HELLO, "Hello" },
318 { OSPF_TYPE_DD, "Database Description" },
319 { OSPF_TYPE_LS_REQ, "LS-Request" },
320 { OSPF_TYPE_LS_UPDATE, "LS-Update" },
321 { OSPF_TYPE_LS_ACK, "LS-Ack" },
322 { 0, NULL }
323 };
324
325 static const struct tok ospf6_lsa_values[] = {
326 { LS_TYPE_ROUTER, "Router" },
327 { LS_TYPE_NETWORK, "Network" },
328 { LS_TYPE_INTER_AP, "Inter-Area Prefix" },
329 { LS_TYPE_INTER_AR, "Inter-Area Router" },
330 { LS_TYPE_ASE, "External" },
331 { LS_TYPE_GROUP, "Deprecated" },
332 { LS_TYPE_NSSA, "NSSA" },
333 { LS_TYPE_LINK, "Link" },
334 { LS_TYPE_INTRA_AP, "Intra-Area Prefix" },
335 { LS_TYPE_INTRA_ATE, "Intra-Area TE" },
336 { LS_TYPE_GRACE, "Grace" },
337 { LS_TYPE_RI, "Router Information" },
338 { LS_TYPE_INTER_ASTE, "Inter-AS-TE" },
339 { LS_TYPE_L1VPN, "Layer 1 VPN" },
340 { 0, NULL }
341 };
342
343 static const struct tok ospf6_ls_scope_values[] = {
344 { LS_SCOPE_LINKLOCAL, "Link Local" },
345 { LS_SCOPE_AREA, "Area Local" },
346 { LS_SCOPE_AS, "Domain Wide" },
347 { 0, NULL }
348 };
349
350 static const struct tok ospf6_dd_flag_values[] = {
351 { OSPF6_DB_INIT, "Init" },
352 { OSPF6_DB_MORE, "More" },
353 { OSPF6_DB_MASTER, "Master" },
354 { OSPF6_DB_M6, "IPv6 MTU" },
355 { 0, NULL }
356 };
357
358 static const struct tok ospf6_lsa_prefix_option_values[] = {
359 { LSA_PREFIX_OPT_NU, "No Unicast" },
360 { LSA_PREFIX_OPT_LA, "Local address" },
361 { LSA_PREFIX_OPT_MC, "Deprecated" },
362 { LSA_PREFIX_OPT_P, "Propagate" },
363 { LSA_PREFIX_OPT_DN, "Down" },
364 { 0, NULL }
365 };
366
367 static const struct tok ospf6_auth_type_str[] = {
368 { OSPF6_AUTH_TYPE_HMAC, "HMAC" },
369 { 0, NULL }
370 };
371
372 static void
373 ospf6_print_ls_type(netdissect_options *ndo,
374 register u_int ls_type, register const rtrid_t *ls_stateid)
375 {
376 ND_PRINT((ndo, "\n\t %s LSA (%d), %s Scope%s, LSA-ID %s",
377 tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK),
378 ls_type & LS_TYPE_MASK,
379 tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK),
380 ls_type &0x8000 ? ", transitive" : "", /* U-bit */
381 ipaddr_string(ndo, ls_stateid)));
382 }
383
384 static int
385 ospf6_print_lshdr(netdissect_options *ndo,
386 register const struct lsa6_hdr *lshp, const u_char *dataend)
387 {
388 if ((const u_char *)(lshp + 1) > dataend)
389 goto trunc;
390 ND_TCHECK(lshp->ls_type);
391 ND_TCHECK(lshp->ls_seq);
392
393 ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
394 ipaddr_string(ndo, &lshp->ls_router),
395 EXTRACT_32BITS(&lshp->ls_seq),
396 EXTRACT_16BITS(&lshp->ls_age),
397 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr)));
398
399 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid);
400
401 return (0);
402 trunc:
403 return (1);
404 }
405
406 static int
407 ospf6_print_lsaprefix(netdissect_options *ndo,
408 const uint8_t *tptr, u_int lsa_length)
409 {
410 const struct lsa6_prefix *lsapp = (const struct lsa6_prefix *)tptr;
411 u_int wordlen;
412 struct in6_addr prefix;
413
414 if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES)
415 goto trunc;
416 lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES;
417 ND_TCHECK2(*lsapp, sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES);
418 wordlen = (lsapp->lsa_p_len + 31) / 32;
419 if (wordlen * 4 > sizeof(struct in6_addr)) {
420 ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len));
421 goto trunc;
422 }
423 if (lsa_length < wordlen * 4)
424 goto trunc;
425 lsa_length -= wordlen * 4;
426 ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4);
427 memset(&prefix, 0, sizeof(prefix));
428 memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4);
429 ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix),
430 lsapp->lsa_p_len));
431 if (lsapp->lsa_p_opt) {
432 ND_PRINT((ndo, ", Options [%s]",
433 bittok2str(ospf6_lsa_prefix_option_values,
434 "none", lsapp->lsa_p_opt)));
435 }
436 ND_PRINT((ndo, ", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric)));
437 return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4;
438
439 trunc:
440 return -1;
441 }
442
443
444 /*
445 * Print a single link state advertisement. If truncated return 1, else 0.
446 */
447 static int
448 ospf6_print_lsa(netdissect_options *ndo,
449 register const struct lsa6 *lsap, const u_char *dataend)
450 {
451 register const struct rlalink6 *rlp;
452 #if 0
453 register const struct tos_metric *tosp;
454 #endif
455 register const rtrid_t *ap;
456 #if 0
457 register const struct aslametric *almp;
458 register const struct mcla *mcp;
459 #endif
460 register const struct llsa *llsap;
461 register const struct lsa6_prefix *lsapp;
462 #if 0
463 register const uint32_t *lp;
464 #endif
465 register u_int prefixes;
466 register int bytelen;
467 register u_int length, lsa_length;
468 uint32_t flags32;
469 const uint8_t *tptr;
470
471 if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend))
472 return (1);
473 ND_TCHECK(lsap->ls_hdr.ls_length);
474 length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length);
475
476 /*
477 * The LSA length includes the length of the header;
478 * it must have a value that's at least that length.
479 * If it does, find the length of what follows the
480 * header.
481 */
482 if (length < sizeof(struct lsa6_hdr) || (const u_char *)lsap + length > dataend)
483 return (1);
484 lsa_length = length - sizeof(struct lsa6_hdr);
485 tptr = (const uint8_t *)lsap+sizeof(struct lsa6_hdr);
486
487 switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) {
488 case LS_TYPE_ROUTER | LS_SCOPE_AREA:
489 if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options))
490 return (1);
491 lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options);
492 ND_TCHECK(lsap->lsa_un.un_rla.rla_options);
493 ND_PRINT((ndo, "\n\t Options [%s]",
494 bittok2str(ospf6_option_values, "none",
495 EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options))));
496 ND_PRINT((ndo, ", RLA-Flags [%s]",
497 bittok2str(ospf6_rla_flag_values, "none",
498 lsap->lsa_un.un_rla.rla_flags)));
499
500 rlp = lsap->lsa_un.un_rla.rla_link;
501 while (lsa_length != 0) {
502 if (lsa_length < sizeof (*rlp))
503 return (1);
504 lsa_length -= sizeof (*rlp);
505 ND_TCHECK(*rlp);
506 switch (rlp->link_type) {
507
508 case RLA_TYPE_VIRTUAL:
509 ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID %s"
510 "\n\t Neighbor Interface-ID %s, Interface %s",
511 ipaddr_string(ndo, &rlp->link_nrtid),
512 ipaddr_string(ndo, &rlp->link_nifid),
513 ipaddr_string(ndo, &rlp->link_ifid)));
514 break;
515
516 case RLA_TYPE_ROUTER:
517 ND_PRINT((ndo, "\n\t Neighbor Router-ID %s"
518 "\n\t Neighbor Interface-ID %s, Interface %s",
519 ipaddr_string(ndo, &rlp->link_nrtid),
520 ipaddr_string(ndo, &rlp->link_nifid),
521 ipaddr_string(ndo, &rlp->link_ifid)));
522 break;
523
524 case RLA_TYPE_TRANSIT:
525 ND_PRINT((ndo, "\n\t Neighbor Network-ID %s"
526 "\n\t Neighbor Interface-ID %s, Interface %s",
527 ipaddr_string(ndo, &rlp->link_nrtid),
528 ipaddr_string(ndo, &rlp->link_nifid),
529 ipaddr_string(ndo, &rlp->link_ifid)));
530 break;
531
532 default:
533 ND_PRINT((ndo, "\n\t Unknown Router Links Type 0x%02x",
534 rlp->link_type));
535 return (0);
536 }
537 ND_PRINT((ndo, ", metric %d", EXTRACT_16BITS(&rlp->link_metric)));
538 rlp++;
539 }
540 break;
541
542 case LS_TYPE_NETWORK | LS_SCOPE_AREA:
543 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options))
544 return (1);
545 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options);
546 ND_TCHECK(lsap->lsa_un.un_nla.nla_options);
547 ND_PRINT((ndo, "\n\t Options [%s]",
548 bittok2str(ospf6_option_values, "none",
549 EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options))));
550
551 ND_PRINT((ndo, "\n\t Connected Routers:"));
552 ap = lsap->lsa_un.un_nla.nla_router;
553 while (lsa_length != 0) {
554 if (lsa_length < sizeof (*ap))
555 return (1);
556 lsa_length -= sizeof (*ap);
557 ND_TCHECK(*ap);
558 ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, ap)));
559 ++ap;
560 }
561 break;
562
563 case LS_TYPE_INTER_AP | LS_SCOPE_AREA:
564 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric))
565 return (1);
566 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric);
567 ND_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric);
568 ND_PRINT((ndo, ", metric %u",
569 EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC));
570
571 tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix;
572 while (lsa_length != 0) {
573 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
574 if (bytelen < 0)
575 goto trunc;
576 lsa_length -= bytelen;
577 tptr += bytelen;
578 }
579 break;
580
581 case LS_TYPE_ASE | LS_SCOPE_AS:
582 if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric))
583 return (1);
584 lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric);
585 ND_TCHECK(lsap->lsa_un.un_asla.asla_metric);
586 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric);
587 ND_PRINT((ndo, "\n\t Flags [%s]",
588 bittok2str(ospf6_asla_flag_values, "none", flags32)));
589 ND_PRINT((ndo, " metric %u",
590 EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) &
591 ASLA_MASK_METRIC));
592
593 tptr = (const uint8_t *)lsap->lsa_un.un_asla.asla_prefix;
594 lsapp = (const struct lsa6_prefix *)tptr;
595 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
596 if (bytelen < 0)
597 goto trunc;
598 lsa_length -= bytelen;
599 tptr += bytelen;
600
601 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
602 const struct in6_addr *fwdaddr6;
603
604 fwdaddr6 = (const struct in6_addr *)tptr;
605 if (lsa_length < sizeof (*fwdaddr6))
606 return (1);
607 lsa_length -= sizeof (*fwdaddr6);
608 ND_TCHECK(*fwdaddr6);
609 ND_PRINT((ndo, " forward %s",
610 ip6addr_string(ndo, fwdaddr6)));
611 tptr += sizeof(*fwdaddr6);
612 }
613
614 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
615 if (lsa_length < sizeof (uint32_t))
616 return (1);
617 lsa_length -= sizeof (uint32_t);
618 ND_TCHECK(*(const uint32_t *)tptr);
619 ND_PRINT((ndo, " tag %s",
620 ipaddr_string(ndo, (const uint32_t *)tptr)));
621 tptr += sizeof(uint32_t);
622 }
623
624 if (lsapp->lsa_p_metric) {
625 if (lsa_length < sizeof (uint32_t))
626 return (1);
627 lsa_length -= sizeof (uint32_t);
628 ND_TCHECK(*(const uint32_t *)tptr);
629 ND_PRINT((ndo, " RefLSID: %s",
630 ipaddr_string(ndo, (const uint32_t *)tptr)));
631 tptr += sizeof(uint32_t);
632 }
633 break;
634
635 case LS_TYPE_LINK:
636 /* Link LSA */
637 llsap = &lsap->lsa_un.un_llsa;
638 if (lsa_length < sizeof (llsap->llsa_priandopt))
639 return (1);
640 lsa_length -= sizeof (llsap->llsa_priandopt);
641 ND_TCHECK(llsap->llsa_priandopt);
642 ND_PRINT((ndo, "\n\t Options [%s]",
643 bittok2str(ospf6_option_values, "none",
644 EXTRACT_32BITS(&llsap->llsa_options))));
645
646 if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix))
647 return (1);
648 lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix);
649 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix);
650 ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:",
651 llsap->llsa_priority,
652 ip6addr_string(ndo, &llsap->llsa_lladdr),
653 prefixes));
654
655 tptr = (const uint8_t *)llsap->llsa_prefix;
656 while (prefixes > 0) {
657 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
658 if (bytelen < 0)
659 goto trunc;
660 prefixes--;
661 lsa_length -= bytelen;
662 tptr += bytelen;
663 }
664 break;
665
666 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA:
667 /* Intra-Area-Prefix LSA */
668 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid))
669 return (1);
670 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid);
671 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
672 ospf6_print_ls_type(ndo,
673 EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype),
674 &lsap->lsa_un.un_intra_ap.intra_ap_lsid);
675
676 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix))
677 return (1);
678 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
679 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
680 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
681 ND_PRINT((ndo, "\n\t Prefixes %d:", prefixes));
682
683 tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
684 while (prefixes > 0) {
685 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
686 if (bytelen < 0)
687 goto trunc;
688 prefixes--;
689 lsa_length -= bytelen;
690 tptr += bytelen;
691 }
692 break;
693
694 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
695 if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) {
696 return 1;
697 }
698 break;
699
700 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
701 if (ospf_print_te_lsa(ndo, tptr, lsa_length) == -1) {
702 return 1;
703 }
704 break;
705
706 default:
707 if(!print_unknown_data(ndo,tptr,
708 "\n\t ",
709 lsa_length)) {
710 return (1);
711 }
712 break;
713 }
714
715 return (0);
716 trunc:
717 return (1);
718 }
719
720 static int
721 ospf6_decode_v3(netdissect_options *ndo,
722 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 register const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
735
736 ND_PRINT((ndo, "\n\tOptions [%s]",
737 bittok2str(ospf6_option_values, "none",
738 EXTRACT_32BITS(&hellop->hello_options))));
739
740 ND_TCHECK(hellop->hello_deadint);
741 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
742 EXTRACT_16BITS(&hellop->hello_helloint),
743 EXTRACT_16BITS(&hellop->hello_deadint),
744 ipaddr_string(ndo, &hellop->hello_ifid),
745 hellop->hello_priority));
746
747 ND_TCHECK(hellop->hello_dr);
748 if (EXTRACT_32BITS(&hellop->hello_dr) != 0)
749 ND_PRINT((ndo, "\n\t Designated Router %s",
750 ipaddr_string(ndo, &hellop->hello_dr)));
751 ND_TCHECK(hellop->hello_bdr);
752 if (EXTRACT_32BITS(&hellop->hello_bdr) != 0)
753 ND_PRINT((ndo, ", Backup Designated Router %s",
754 ipaddr_string(ndo, &hellop->hello_bdr)));
755 if (ndo->ndo_vflag > 1) {
756 ND_PRINT((ndo, "\n\t Neighbor List:"));
757 ap = hellop->hello_neighbor;
758 while ((const u_char *)ap < dataend) {
759 ND_TCHECK(*ap);
760 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap)));
761 ++ap;
762 }
763 }
764 break; /* HELLO */
765 }
766
767 case OSPF_TYPE_DD: {
768 register const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
769
770 ND_TCHECK(ddp->db_options);
771 ND_PRINT((ndo, "\n\tOptions [%s]",
772 bittok2str(ospf6_option_values, "none",
773 EXTRACT_32BITS(&ddp->db_options))));
774 ND_TCHECK(ddp->db_flags);
775 ND_PRINT((ndo, ", DD Flags [%s]",
776 bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags)));
777
778 ND_TCHECK(ddp->db_seq);
779 ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x",
780 EXTRACT_16BITS(&ddp->db_mtu),
781 EXTRACT_32BITS(&ddp->db_seq)));
782 if (ndo->ndo_vflag > 1) {
783 /* Print all the LS adv's */
784 lshp = ddp->db_lshdr;
785 while ((const u_char *)lshp < dataend) {
786 if (ospf6_print_lshdr(ndo, lshp++, dataend))
787 goto trunc;
788 }
789 }
790 break;
791 }
792
793 case OSPF_TYPE_LS_REQ:
794 if (ndo->ndo_vflag > 1) {
795 lsrp = (const struct lsr6 *)((const uint8_t *)op + OSPF6HDR_LEN);
796 while ((const u_char *)lsrp < dataend) {
797 ND_TCHECK(*lsrp);
798 ND_PRINT((ndo, "\n\t Advertising Router %s",
799 ipaddr_string(ndo, &lsrp->ls_router)));
800 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type),
801 &lsrp->ls_stateid);
802 ++lsrp;
803 }
804 }
805 break;
806
807 case OSPF_TYPE_LS_UPDATE:
808 if (ndo->ndo_vflag > 1) {
809 register const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN);
810
811 ND_TCHECK(lsup->lsu_count);
812 i = EXTRACT_32BITS(&lsup->lsu_count);
813 lsap = lsup->lsu_lsa;
814 while ((const u_char *)lsap < dataend && i--) {
815 if (ospf6_print_lsa(ndo, lsap, dataend))
816 goto trunc;
817 lsap = (const struct lsa6 *)((const u_char *)lsap +
818 EXTRACT_16BITS(&lsap->ls_hdr.ls_length));
819 }
820 }
821 break;
822
823 case OSPF_TYPE_LS_ACK:
824 if (ndo->ndo_vflag > 1) {
825 lshp = (const struct lsa6_hdr *)((const uint8_t *)op + OSPF6HDR_LEN);
826 while ((const u_char *)lshp < dataend) {
827 if (ospf6_print_lshdr(ndo, lshp++, dataend))
828 goto trunc;
829 }
830 }
831 break;
832
833 default:
834 break;
835 }
836 return (0);
837 trunc:
838 return (1);
839 }
840
841 /* RFC5613 Section 2.2 (w/o the TLVs) */
842 static int
843 ospf6_print_lls(netdissect_options *ndo,
844 const u_char *cp, const u_int len)
845 {
846 uint16_t llsdatalen;
847
848 if (len == 0)
849 return 0;
850 if (len < OSPF_LLS_HDRLEN)
851 goto trunc;
852 /* Checksum */
853 ND_TCHECK2(*cp, 2);
854 ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp)));
855 cp += 2;
856 /* LLS Data Length */
857 ND_TCHECK2(*cp, 2);
858 llsdatalen = EXTRACT_16BITS(cp);
859 ND_PRINT((ndo, ", Data Length %u", llsdatalen));
860 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
861 goto trunc;
862 cp += 2;
863 /* LLS TLVs */
864 ND_TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN);
865 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */
866
867 return llsdatalen;
868 trunc:
869 return -1;
870 }
871
872 /* RFC6506 Section 4.1 */
873 static int
874 ospf6_decode_at(netdissect_options *ndo,
875 const u_char *cp, const u_int len)
876 {
877 uint16_t authdatalen;
878
879 if (len == 0)
880 return 0;
881 if (len < OSPF6_AT_HDRLEN)
882 goto trunc;
883 /* Authentication Type */
884 ND_TCHECK2(*cp, 2);
885 ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp))));
886 cp += 2;
887 /* Auth Data Len */
888 ND_TCHECK2(*cp, 2);
889 authdatalen = EXTRACT_16BITS(cp);
890 ND_PRINT((ndo, ", Length %u", authdatalen));
891 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
892 goto trunc;
893 cp += 2;
894 /* Reserved */
895 ND_TCHECK2(*cp, 2);
896 cp += 2;
897 /* Security Association ID */
898 ND_TCHECK2(*cp, 2);
899 ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp)));
900 cp += 2;
901 /* Cryptographic Sequence Number (High-Order 32 Bits) */
902 ND_TCHECK2(*cp, 4);
903 ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp)));
904 cp += 4;
905 /* Cryptographic Sequence Number (Low-Order 32 Bits) */
906 ND_TCHECK2(*cp, 4);
907 ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp)));
908 cp += 4;
909 /* Authentication Data */
910 ND_TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN);
911 if (ndo->ndo_vflag > 1)
912 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN);
913 return 0;
914
915 trunc:
916 return 1;
917 }
918
919 /* The trailing data may include LLS and/or AT data (in this specific order).
920 * LLS data may be present only in Hello and DBDesc packets with the L-bit set.
921 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in
922 * any other packet type, thus decode the AT data regardless of the AT-bit.
923 */
924 static int
925 ospf6_decode_v3_trailer(netdissect_options *ndo,
926 const struct ospf6hdr *op, const u_char *cp, const unsigned len)
927 {
928 int llslen = 0;
929 int lls_hello = 0;
930 int lls_dd = 0;
931
932 if (op->ospf6_type == OSPF_TYPE_HELLO) {
933 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
934 if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L)
935 lls_hello = 1;
936 } else if (op->ospf6_type == OSPF_TYPE_DD) {
937 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
938 if (EXTRACT_32BITS(&ddp->db_options) & OSPF6_OPTION_L)
939 lls_dd = 1;
940 }
941 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0)
942 goto trunc;
943 return ospf6_decode_at(ndo, cp + llslen, len - llslen);
944
945 trunc:
946 return 1;
947 }
948
949 void
950 ospf6_print(netdissect_options *ndo,
951 register const u_char *bp, register u_int length)
952 {
953 register const struct ospf6hdr *op;
954 register const u_char *dataend;
955 register const char *cp;
956 uint16_t datalen;
957
958 op = (const struct ospf6hdr *)bp;
959
960 /* If the type is valid translate it, or just print the type */
961 /* value. If it's not valid, say so and return */
962 ND_TCHECK(op->ospf6_type);
963 cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type);
964 ND_PRINT((ndo, "OSPFv%u, %s, length %d", op->ospf6_version, cp, length));
965 if (*cp == 'u') {
966 return;
967 }
968
969 if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
970 return;
971 }
972
973 /* OSPFv3 data always comes first and optional trailing data may follow. */
974 ND_TCHECK(op->ospf6_len);
975 datalen = EXTRACT_16BITS(&op->ospf6_len);
976 if (datalen > length) {
977 ND_PRINT((ndo, " [len %d]", datalen));
978 return;
979 }
980 dataend = bp + datalen;
981
982 ND_TCHECK(op->ospf6_routerid);
983 ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf6_routerid)));
984
985 ND_TCHECK(op->ospf6_areaid);
986 if (EXTRACT_32BITS(&op->ospf6_areaid) != 0)
987 ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf6_areaid)));
988 else
989 ND_PRINT((ndo, ", Backbone Area"));
990 ND_TCHECK(op->ospf6_instanceid);
991 if (op->ospf6_instanceid)
992 ND_PRINT((ndo, ", Instance %u", op->ospf6_instanceid));
993
994 /* Do rest according to version. */
995 switch (op->ospf6_version) {
996
997 case 3:
998 /* ospf version 3 */
999 if (ospf6_decode_v3(ndo, op, dataend) ||
1000 ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen))
1001 goto trunc;
1002 break;
1003 } /* end switch on version */
1004
1005 return;
1006 trunc:
1007 ND_PRINT((ndo, "%s", tstr));
1008 }
[mirror] the TCPdump network dissector