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Handle very large -f files by rejecting them.
[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 /* \summary: IPv6 Open Shortest Path First (OSPFv3) printer */
25
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include <netdissect-stdinc.h>
31
32 #include <string.h>
33
34 #include "netdissect.h"
35 #include "addrtoname.h"
36 #include "extract.h"
37
38 #include "ospf.h"
39
40 #define OSPF_TYPE_HELLO 1 /* Hello */
41 #define OSPF_TYPE_DD 2 /* Database Description */
42 #define OSPF_TYPE_LS_REQ 3 /* Link State Request */
43 #define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */
44 #define OSPF_TYPE_LS_ACK 5 /* Link State Ack */
45
46 /* Options *_options */
47 #define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */
48 #define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */
49 #define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */
50 #define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */
51 #define OSPF6_OPTION_R 0x10 /* R bit: Router bit */
52 #define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */
53 /* The field is actually 24-bit (RFC5340 Section A.2). */
54 #define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */
55 #define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */
56 #define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */
57
58
59 /* db_flags */
60 #define OSPF6_DB_INIT 0x04 /* */
61 #define OSPF6_DB_MORE 0x02
62 #define OSPF6_DB_MASTER 0x01
63 #define OSPF6_DB_M6 0x10 /* IPv6 MTU */
64
65 /* ls_type */
66 #define LS_TYPE_ROUTER 1 /* router link */
67 #define LS_TYPE_NETWORK 2 /* network link */
68 #define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */
69 #define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */
70 #define LS_TYPE_ASE 5 /* ASE */
71 #define LS_TYPE_GROUP 6 /* Group membership */
72 #define LS_TYPE_NSSA 7 /* NSSA */
73 #define LS_TYPE_LINK 8 /* Link LSA */
74 #define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */
75 #define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */
76 #define LS_TYPE_GRACE 11 /* Grace LSA */
77 #define LS_TYPE_RI 12 /* Router information */
78 #define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */
79 #define LS_TYPE_L1VPN 14 /* L1VPN */
80 #define LS_TYPE_MASK 0x1fff
81
82 #define LS_SCOPE_LINKLOCAL 0x0000
83 #define LS_SCOPE_AREA 0x2000
84 #define LS_SCOPE_AS 0x4000
85 #define LS_SCOPE_MASK 0x6000
86 #define LS_SCOPE_U 0x8000
87
88 /* rla_link.link_type */
89 #define RLA_TYPE_ROUTER 1 /* point-to-point to another router */
90 #define RLA_TYPE_TRANSIT 2 /* connection to transit network */
91 #define RLA_TYPE_VIRTUAL 4 /* virtual link */
92
93 /* rla_flags */
94 #define RLA_FLAG_B 0x01
95 #define RLA_FLAG_E 0x02
96 #define RLA_FLAG_V 0x04
97 #define RLA_FLAG_W 0x08
98 #define RLA_FLAG_N 0x10
99
100 /* lsa_prefix options */
101 #define LSA_PREFIX_OPT_NU 0x01
102 #define LSA_PREFIX_OPT_LA 0x02
103 #define LSA_PREFIX_OPT_MC 0x04
104 #define LSA_PREFIX_OPT_P 0x08
105 #define LSA_PREFIX_OPT_DN 0x10
106
107 /* sla_tosmetric breakdown */
108 #define SLA_MASK_TOS 0x7f000000
109 #define SLA_MASK_METRIC 0x00ffffff
110 #define SLA_SHIFT_TOS 24
111
112 /* asla_metric */
113 #define ASLA_FLAG_FWDADDR 0x02000000
114 #define ASLA_FLAG_ROUTETAG 0x01000000
115 #define ASLA_MASK_METRIC 0x00ffffff
116
117 /* RFC6506 Section 4.1 */
118 #define OSPF6_AT_HDRLEN 16U
119 #define OSPF6_AUTH_TYPE_HMAC 0x0001
120
121 typedef uint32_t rtrid_t;
122
123 /* link state advertisement header */
124 struct lsa6_hdr {
125 uint16_t ls_age;
126 uint16_t ls_type;
127 rtrid_t ls_stateid;
128 rtrid_t ls_router;
129 uint32_t ls_seq;
130 uint16_t ls_chksum;
131 uint16_t ls_length;
132 };
133
134 /* Length of an IPv6 address, in bytes. */
135 #define IPV6_ADDR_LEN_BYTES (128/8)
136
137 struct lsa6_prefix {
138 uint8_t lsa_p_len;
139 uint8_t lsa_p_opt;
140 uint16_t lsa_p_metric;
141 uint8_t lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */
142 };
143
144 /* link state advertisement */
145 struct lsa6 {
146 struct lsa6_hdr ls_hdr;
147
148 /* Link state types */
149 union {
150 /* Router links advertisements */
151 struct {
152 union {
153 uint8_t flg;
154 uint32_t opt;
155 } rla_flgandopt;
156 #define rla_flags rla_flgandopt.flg
157 #define rla_options rla_flgandopt.opt
158 struct rlalink6 {
159 uint8_t link_type;
160 uint8_t link_zero[1];
161 uint16_t link_metric;
162 uint32_t link_ifid;
163 uint32_t link_nifid;
164 rtrid_t link_nrtid;
165 } rla_link[1]; /* may repeat */
166 } un_rla;
167
168 /* Network links advertisements */
169 struct {
170 uint32_t nla_options;
171 rtrid_t nla_router[1]; /* may repeat */
172 } un_nla;
173
174 /* Inter Area Prefix LSA */
175 struct {
176 uint32_t inter_ap_metric;
177 struct lsa6_prefix inter_ap_prefix[1];
178 } un_inter_ap;
179
180 /* AS external links advertisements */
181 struct {
182 uint32_t asla_metric;
183 struct lsa6_prefix asla_prefix[1];
184 /* some optional fields follow */
185 } un_asla;
186
187 #if 0
188 /* Summary links advertisements */
189 struct {
190 struct in_addr sla_mask;
191 uint32_t sla_tosmetric[1]; /* may repeat */
192 } un_sla;
193
194 /* Multicast group membership */
195 struct mcla {
196 uint32_t mcla_vtype;
197 struct in_addr mcla_vid;
198 } un_mcla[1];
199 #endif
200
201 /* Type 7 LSA */
202
203 /* Link LSA */
204 struct llsa {
205 union {
206 uint8_t pri;
207 uint32_t opt;
208 } llsa_priandopt;
209 #define llsa_priority llsa_priandopt.pri
210 #define llsa_options llsa_priandopt.opt
211 struct in6_addr llsa_lladdr;
212 uint32_t llsa_nprefix;
213 struct lsa6_prefix llsa_prefix[1];
214 } un_llsa;
215
216 /* Intra-Area-Prefix */
217 struct {
218 uint16_t intra_ap_nprefix;
219 uint16_t intra_ap_lstype;
220 rtrid_t intra_ap_lsid;
221 rtrid_t intra_ap_rtid;
222 struct lsa6_prefix intra_ap_prefix[1];
223 } un_intra_ap;
224 } lsa_un;
225 };
226
227 /*
228 * the main header
229 */
230 struct ospf6hdr {
231 uint8_t ospf6_version;
232 uint8_t ospf6_type;
233 uint16_t ospf6_len;
234 rtrid_t ospf6_routerid;
235 rtrid_t ospf6_areaid;
236 uint16_t ospf6_chksum;
237 uint8_t ospf6_instanceid;
238 uint8_t ospf6_rsvd;
239 };
240
241 /*
242 * The OSPF6 header length is 16 bytes, regardless of how your compiler
243 * might choose to pad the above structure.
244 */
245 #define OSPF6HDR_LEN 16
246
247 /* Hello packet */
248 struct hello6 {
249 uint32_t hello_ifid;
250 union {
251 uint8_t pri;
252 uint32_t opt;
253 } hello_priandopt;
254 #define hello_priority hello_priandopt.pri
255 #define hello_options hello_priandopt.opt
256 uint16_t hello_helloint;
257 uint16_t hello_deadint;
258 rtrid_t hello_dr;
259 rtrid_t hello_bdr;
260 rtrid_t hello_neighbor[1]; /* may repeat */
261 };
262
263 /* Database Description packet */
264 struct dd6 {
265 uint32_t db_options;
266 uint16_t db_mtu;
267 uint8_t db_mbz;
268 uint8_t db_flags;
269 uint32_t db_seq;
270 struct lsa6_hdr db_lshdr[1]; /* may repeat */
271 };
272
273 /* Link State Request */
274 struct lsr6 {
275 uint16_t ls_mbz;
276 uint16_t ls_type;
277 rtrid_t ls_stateid;
278 rtrid_t ls_router;
279 };
280
281 /* Link State Update */
282 struct lsu6 {
283 uint32_t lsu_count;
284 struct lsa6 lsu_lsa[1]; /* may repeat */
285 };
286
287 static const char tstr[] = " [|ospf3]";
288
289 static const struct tok ospf6_option_values[] = {
290 { OSPF6_OPTION_V6, "V6" },
291 { OSPF6_OPTION_E, "External" },
292 { OSPF6_OPTION_MC, "Deprecated" },
293 { OSPF6_OPTION_N, "NSSA" },
294 { OSPF6_OPTION_R, "Router" },
295 { OSPF6_OPTION_DC, "Demand Circuit" },
296 { OSPF6_OPTION_AF, "AFs Support" },
297 { OSPF6_OPTION_L, "LLS" },
298 { OSPF6_OPTION_AT, "Authentication Trailer" },
299 { 0, NULL }
300 };
301
302 static const struct tok ospf6_rla_flag_values[] = {
303 { RLA_FLAG_B, "ABR" },
304 { RLA_FLAG_E, "External" },
305 { RLA_FLAG_V, "Virtual-Link Endpoint" },
306 { RLA_FLAG_W, "Wildcard Receiver" },
307 { RLA_FLAG_N, "NSSA Translator" },
308 { 0, NULL }
309 };
310
311 static const struct tok ospf6_asla_flag_values[] = {
312 { ASLA_FLAG_EXTERNAL, "External Type 2" },
313 { ASLA_FLAG_FWDADDR, "Forwarding" },
314 { ASLA_FLAG_ROUTETAG, "Tag" },
315 { 0, NULL }
316 };
317
318 static const struct tok ospf6_type_values[] = {
319 { OSPF_TYPE_HELLO, "Hello" },
320 { OSPF_TYPE_DD, "Database Description" },
321 { OSPF_TYPE_LS_REQ, "LS-Request" },
322 { OSPF_TYPE_LS_UPDATE, "LS-Update" },
323 { OSPF_TYPE_LS_ACK, "LS-Ack" },
324 { 0, NULL }
325 };
326
327 static const struct tok ospf6_lsa_values[] = {
328 { LS_TYPE_ROUTER, "Router" },
329 { LS_TYPE_NETWORK, "Network" },
330 { LS_TYPE_INTER_AP, "Inter-Area Prefix" },
331 { LS_TYPE_INTER_AR, "Inter-Area Router" },
332 { LS_TYPE_ASE, "External" },
333 { LS_TYPE_GROUP, "Deprecated" },
334 { LS_TYPE_NSSA, "NSSA" },
335 { LS_TYPE_LINK, "Link" },
336 { LS_TYPE_INTRA_AP, "Intra-Area Prefix" },
337 { LS_TYPE_INTRA_ATE, "Intra-Area TE" },
338 { LS_TYPE_GRACE, "Grace" },
339 { LS_TYPE_RI, "Router Information" },
340 { LS_TYPE_INTER_ASTE, "Inter-AS-TE" },
341 { LS_TYPE_L1VPN, "Layer 1 VPN" },
342 { 0, NULL }
343 };
344
345 static const struct tok ospf6_ls_scope_values[] = {
346 { LS_SCOPE_LINKLOCAL, "Link Local" },
347 { LS_SCOPE_AREA, "Area Local" },
348 { LS_SCOPE_AS, "Domain Wide" },
349 { 0, NULL }
350 };
351
352 static const struct tok ospf6_dd_flag_values[] = {
353 { OSPF6_DB_INIT, "Init" },
354 { OSPF6_DB_MORE, "More" },
355 { OSPF6_DB_MASTER, "Master" },
356 { OSPF6_DB_M6, "IPv6 MTU" },
357 { 0, NULL }
358 };
359
360 static const struct tok ospf6_lsa_prefix_option_values[] = {
361 { LSA_PREFIX_OPT_NU, "No Unicast" },
362 { LSA_PREFIX_OPT_LA, "Local address" },
363 { LSA_PREFIX_OPT_MC, "Deprecated" },
364 { LSA_PREFIX_OPT_P, "Propagate" },
365 { LSA_PREFIX_OPT_DN, "Down" },
366 { 0, NULL }
367 };
368
369 static const struct tok ospf6_auth_type_str[] = {
370 { OSPF6_AUTH_TYPE_HMAC, "HMAC" },
371 { 0, NULL }
372 };
373
374 static void
375 ospf6_print_ls_type(netdissect_options *ndo,
376 register u_int ls_type, register const rtrid_t *ls_stateid)
377 {
378 ND_PRINT((ndo, "\n\t %s LSA (%d), %s Scope%s, LSA-ID %s",
379 tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK),
380 ls_type & LS_TYPE_MASK,
381 tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK),
382 ls_type &0x8000 ? ", transitive" : "", /* U-bit */
383 ipaddr_string(ndo, ls_stateid)));
384 }
385
386 static int
387 ospf6_print_lshdr(netdissect_options *ndo,
388 register const struct lsa6_hdr *lshp, const u_char *dataend)
389 {
390 if ((const u_char *)(lshp + 1) > dataend)
391 goto trunc;
392 ND_TCHECK(lshp->ls_length); /* last field of struct lsa6_hdr */
393
394 ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
395 ipaddr_string(ndo, &lshp->ls_router),
396 EXTRACT_32BITS(&lshp->ls_seq),
397 EXTRACT_16BITS(&lshp->ls_age),
398 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr)));
399
400 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid);
401
402 return (0);
403 trunc:
404 return (1);
405 }
406
407 static int
408 ospf6_print_lsaprefix(netdissect_options *ndo,
409 const uint8_t *tptr, u_int lsa_length)
410 {
411 const struct lsa6_prefix *lsapp = (const struct lsa6_prefix *)tptr;
412 u_int wordlen;
413 struct in6_addr prefix;
414
415 if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES)
416 goto trunc;
417 lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES;
418 ND_TCHECK2(*lsapp, sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES);
419 wordlen = (lsapp->lsa_p_len + 31) / 32;
420 if (wordlen * 4 > sizeof(struct in6_addr)) {
421 ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len));
422 goto trunc;
423 }
424 if (lsa_length < wordlen * 4)
425 goto trunc;
426 lsa_length -= wordlen * 4;
427 ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4);
428 memset(&prefix, 0, sizeof(prefix));
429 memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4);
430 ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix),
431 lsapp->lsa_p_len));
432 if (lsapp->lsa_p_opt) {
433 ND_PRINT((ndo, ", Options [%s]",
434 bittok2str(ospf6_lsa_prefix_option_values,
435 "none", lsapp->lsa_p_opt)));
436 }
437 ND_PRINT((ndo, ", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric)));
438 return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4;
439
440 trunc:
441 return -1;
442 }
443
444
445 /*
446 * Print a single link state advertisement. If truncated return 1, else 0.
447 */
448 static int
449 ospf6_print_lsa(netdissect_options *ndo,
450 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 uint32_t *lp;
465 #endif
466 register u_int prefixes;
467 register int bytelen;
468 register u_int length, lsa_length;
469 uint32_t flags32;
470 const uint8_t *tptr;
471
472 if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend))
473 return (1);
474 ND_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) || (const u_char *)lsap + length > dataend)
484 return (1);
485 lsa_length = length - sizeof(struct lsa6_hdr);
486 tptr = (const uint8_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 ND_TCHECK(lsap->lsa_un.un_rla.rla_options);
494 ND_PRINT((ndo, "\n\t Options [%s]",
495 bittok2str(ospf6_option_values, "none",
496 EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options))));
497 ND_PRINT((ndo, ", 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 ND_TCHECK(*rlp);
507 switch (rlp->link_type) {
508
509 case RLA_TYPE_VIRTUAL:
510 ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID %s"
511 "\n\t Neighbor Interface-ID %s, Interface %s",
512 ipaddr_string(ndo, &rlp->link_nrtid),
513 ipaddr_string(ndo, &rlp->link_nifid),
514 ipaddr_string(ndo, &rlp->link_ifid)));
515 break;
516
517 case RLA_TYPE_ROUTER:
518 ND_PRINT((ndo, "\n\t Neighbor Router-ID %s"
519 "\n\t Neighbor Interface-ID %s, Interface %s",
520 ipaddr_string(ndo, &rlp->link_nrtid),
521 ipaddr_string(ndo, &rlp->link_nifid),
522 ipaddr_string(ndo, &rlp->link_ifid)));
523 break;
524
525 case RLA_TYPE_TRANSIT:
526 ND_PRINT((ndo, "\n\t Neighbor Network-ID %s"
527 "\n\t Neighbor Interface-ID %s, Interface %s",
528 ipaddr_string(ndo, &rlp->link_nrtid),
529 ipaddr_string(ndo, &rlp->link_nifid),
530 ipaddr_string(ndo, &rlp->link_ifid)));
531 break;
532
533 default:
534 ND_PRINT((ndo, "\n\t Unknown Router Links Type 0x%02x",
535 rlp->link_type));
536 return (0);
537 }
538 ND_PRINT((ndo, ", 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 ND_TCHECK(lsap->lsa_un.un_nla.nla_options);
548 ND_PRINT((ndo, "\n\t Options [%s]",
549 bittok2str(ospf6_option_values, "none",
550 EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options))));
551
552 ND_PRINT((ndo, "\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 ND_TCHECK(*ap);
559 ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, 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 ND_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric);
569 ND_PRINT((ndo, ", metric %u",
570 EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC));
571
572 tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix;
573 while (lsa_length != 0) {
574 bytelen = ospf6_print_lsaprefix(ndo, 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 ND_TCHECK(lsap->lsa_un.un_asla.asla_metric);
587 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric);
588 ND_PRINT((ndo, "\n\t Flags [%s]",
589 bittok2str(ospf6_asla_flag_values, "none", flags32)));
590 ND_PRINT((ndo, " metric %u",
591 EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) &
592 ASLA_MASK_METRIC));
593
594 tptr = (const uint8_t *)lsap->lsa_un.un_asla.asla_prefix;
595 lsapp = (const struct lsa6_prefix *)tptr;
596 bytelen = ospf6_print_lsaprefix(ndo, 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 const struct in6_addr *fwdaddr6;
604
605 fwdaddr6 = (const struct in6_addr *)tptr;
606 if (lsa_length < sizeof (*fwdaddr6))
607 return (1);
608 lsa_length -= sizeof (*fwdaddr6);
609 ND_TCHECK(*fwdaddr6);
610 ND_PRINT((ndo, " forward %s",
611 ip6addr_string(ndo, fwdaddr6)));
612 tptr += sizeof(*fwdaddr6);
613 }
614
615 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
616 if (lsa_length < sizeof (uint32_t))
617 return (1);
618 lsa_length -= sizeof (uint32_t);
619 ND_TCHECK(*(const uint32_t *)tptr);
620 ND_PRINT((ndo, " tag %s",
621 ipaddr_string(ndo, (const uint32_t *)tptr)));
622 tptr += sizeof(uint32_t);
623 }
624
625 if (lsapp->lsa_p_metric) {
626 if (lsa_length < sizeof (uint32_t))
627 return (1);
628 lsa_length -= sizeof (uint32_t);
629 ND_TCHECK(*(const uint32_t *)tptr);
630 ND_PRINT((ndo, " RefLSID: %s",
631 ipaddr_string(ndo, (const uint32_t *)tptr)));
632 tptr += sizeof(uint32_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 ND_TCHECK(llsap->llsa_priandopt);
643 ND_PRINT((ndo, "\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 ND_TCHECK(llsap->llsa_nprefix);
651 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix);
652 ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:",
653 llsap->llsa_priority,
654 ip6addr_string(ndo, &llsap->llsa_lladdr),
655 prefixes));
656
657 tptr = (const uint8_t *)llsap->llsa_prefix;
658 while (prefixes > 0) {
659 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
660 if (bytelen < 0)
661 goto trunc;
662 prefixes--;
663 lsa_length -= bytelen;
664 tptr += bytelen;
665 }
666 break;
667
668 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA:
669 /* Intra-Area-Prefix LSA */
670 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid))
671 return (1);
672 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid);
673 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
674 ospf6_print_ls_type(ndo,
675 EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype),
676 &lsap->lsa_un.un_intra_ap.intra_ap_lsid);
677
678 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix))
679 return (1);
680 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
681 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
682 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
683 ND_PRINT((ndo, "\n\t Prefixes %d:", prefixes));
684
685 tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
686 while (prefixes > 0) {
687 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
688 if (bytelen < 0)
689 goto trunc;
690 prefixes--;
691 lsa_length -= bytelen;
692 tptr += bytelen;
693 }
694 break;
695
696 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
697 if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) {
698 return 1;
699 }
700 break;
701
702 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
703 if (ospf_print_te_lsa(ndo, tptr, lsa_length) == -1) {
704 return 1;
705 }
706 break;
707
708 default:
709 if(!print_unknown_data(ndo,tptr,
710 "\n\t ",
711 lsa_length)) {
712 return (1);
713 }
714 break;
715 }
716
717 return (0);
718 trunc:
719 return (1);
720 }
721
722 static int
723 ospf6_decode_v3(netdissect_options *ndo,
724 register const struct ospf6hdr *op,
725 register const u_char *dataend)
726 {
727 register const rtrid_t *ap;
728 register const struct lsr6 *lsrp;
729 register const struct lsa6_hdr *lshp;
730 register const struct lsa6 *lsap;
731 register int i;
732
733 switch (op->ospf6_type) {
734
735 case OSPF_TYPE_HELLO: {
736 register const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
737
738 ND_TCHECK_32BITS(&hellop->hello_options);
739 ND_PRINT((ndo, "\n\tOptions [%s]",
740 bittok2str(ospf6_option_values, "none",
741 EXTRACT_32BITS(&hellop->hello_options))));
742
743 ND_TCHECK(hellop->hello_deadint);
744 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
745 EXTRACT_16BITS(&hellop->hello_helloint),
746 EXTRACT_16BITS(&hellop->hello_deadint),
747 ipaddr_string(ndo, &hellop->hello_ifid),
748 hellop->hello_priority));
749
750 ND_TCHECK(hellop->hello_dr);
751 if (EXTRACT_32BITS(&hellop->hello_dr) != 0)
752 ND_PRINT((ndo, "\n\t Designated Router %s",
753 ipaddr_string(ndo, &hellop->hello_dr)));
754 ND_TCHECK(hellop->hello_bdr);
755 if (EXTRACT_32BITS(&hellop->hello_bdr) != 0)
756 ND_PRINT((ndo, ", Backup Designated Router %s",
757 ipaddr_string(ndo, &hellop->hello_bdr)));
758 if (ndo->ndo_vflag > 1) {
759 ND_PRINT((ndo, "\n\t Neighbor List:"));
760 ap = hellop->hello_neighbor;
761 while ((const u_char *)ap < dataend) {
762 ND_TCHECK(*ap);
763 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap)));
764 ++ap;
765 }
766 }
767 break; /* HELLO */
768 }
769
770 case OSPF_TYPE_DD: {
771 register const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
772
773 ND_TCHECK(ddp->db_options);
774 ND_PRINT((ndo, "\n\tOptions [%s]",
775 bittok2str(ospf6_option_values, "none",
776 EXTRACT_32BITS(&ddp->db_options))));
777 ND_TCHECK(ddp->db_flags);
778 ND_PRINT((ndo, ", DD Flags [%s]",
779 bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags)));
780
781 ND_TCHECK(ddp->db_seq);
782 ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x",
783 EXTRACT_16BITS(&ddp->db_mtu),
784 EXTRACT_32BITS(&ddp->db_seq)));
785 if (ndo->ndo_vflag > 1) {
786 /* Print all the LS adv's */
787 lshp = ddp->db_lshdr;
788 while ((const u_char *)lshp < dataend) {
789 if (ospf6_print_lshdr(ndo, lshp++, dataend))
790 goto trunc;
791 }
792 }
793 break;
794 }
795
796 case OSPF_TYPE_LS_REQ:
797 if (ndo->ndo_vflag > 1) {
798 lsrp = (const struct lsr6 *)((const uint8_t *)op + OSPF6HDR_LEN);
799 while ((const u_char *)lsrp < dataend) {
800 ND_TCHECK(*lsrp);
801 ND_PRINT((ndo, "\n\t Advertising Router %s",
802 ipaddr_string(ndo, &lsrp->ls_router)));
803 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type),
804 &lsrp->ls_stateid);
805 ++lsrp;
806 }
807 }
808 break;
809
810 case OSPF_TYPE_LS_UPDATE:
811 if (ndo->ndo_vflag > 1) {
812 register const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN);
813
814 ND_TCHECK(lsup->lsu_count);
815 i = EXTRACT_32BITS(&lsup->lsu_count);
816 lsap = lsup->lsu_lsa;
817 while ((const u_char *)lsap < dataend && i--) {
818 if (ospf6_print_lsa(ndo, lsap, dataend))
819 goto trunc;
820 lsap = (const struct lsa6 *)((const u_char *)lsap +
821 EXTRACT_16BITS(&lsap->ls_hdr.ls_length));
822 }
823 }
824 break;
825
826 case OSPF_TYPE_LS_ACK:
827 if (ndo->ndo_vflag > 1) {
828 lshp = (const struct lsa6_hdr *)((const uint8_t *)op + OSPF6HDR_LEN);
829 while ((const u_char *)lshp < dataend) {
830 if (ospf6_print_lshdr(ndo, lshp++, dataend))
831 goto trunc;
832 }
833 }
834 break;
835
836 default:
837 break;
838 }
839 return (0);
840 trunc:
841 return (1);
842 }
843
844 /* RFC5613 Section 2.2 (w/o the TLVs) */
845 static int
846 ospf6_print_lls(netdissect_options *ndo,
847 const u_char *cp, const u_int len)
848 {
849 uint16_t llsdatalen;
850
851 if (len == 0)
852 return 0;
853 if (len < OSPF_LLS_HDRLEN)
854 goto trunc;
855 /* Checksum */
856 ND_TCHECK2(*cp, 2);
857 ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp)));
858 cp += 2;
859 /* LLS Data Length */
860 ND_TCHECK2(*cp, 2);
861 llsdatalen = EXTRACT_16BITS(cp);
862 ND_PRINT((ndo, ", Data Length %u", llsdatalen));
863 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
864 goto trunc;
865 cp += 2;
866 /* LLS TLVs */
867 ND_TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN);
868 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */
869
870 return llsdatalen;
871 trunc:
872 return -1;
873 }
874
875 /* RFC6506 Section 4.1 */
876 static int
877 ospf6_decode_at(netdissect_options *ndo,
878 const u_char *cp, const u_int len)
879 {
880 uint16_t authdatalen;
881
882 if (len == 0)
883 return 0;
884 if (len < OSPF6_AT_HDRLEN)
885 goto trunc;
886 /* Authentication Type */
887 ND_TCHECK2(*cp, 2);
888 ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp))));
889 cp += 2;
890 /* Auth Data Len */
891 ND_TCHECK2(*cp, 2);
892 authdatalen = EXTRACT_16BITS(cp);
893 ND_PRINT((ndo, ", Length %u", authdatalen));
894 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
895 goto trunc;
896 cp += 2;
897 /* Reserved */
898 ND_TCHECK2(*cp, 2);
899 cp += 2;
900 /* Security Association ID */
901 ND_TCHECK2(*cp, 2);
902 ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp)));
903 cp += 2;
904 /* Cryptographic Sequence Number (High-Order 32 Bits) */
905 ND_TCHECK2(*cp, 4);
906 ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp)));
907 cp += 4;
908 /* Cryptographic Sequence Number (Low-Order 32 Bits) */
909 ND_TCHECK2(*cp, 4);
910 ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp)));
911 cp += 4;
912 /* Authentication Data */
913 ND_TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN);
914 if (ndo->ndo_vflag > 1)
915 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN);
916 return 0;
917
918 trunc:
919 return 1;
920 }
921
922 /* The trailing data may include LLS and/or AT data (in this specific order).
923 * LLS data may be present only in Hello and DBDesc packets with the L-bit set.
924 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in
925 * any other packet type, thus decode the AT data regardless of the AT-bit.
926 */
927 static int
928 ospf6_decode_v3_trailer(netdissect_options *ndo,
929 const struct ospf6hdr *op, const u_char *cp, const unsigned len)
930 {
931 int llslen = 0;
932 int lls_hello = 0;
933 int lls_dd = 0;
934
935 if (op->ospf6_type == OSPF_TYPE_HELLO) {
936 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
937 ND_TCHECK(hellop->hello_options);
938 if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L)
939 lls_hello = 1;
940 } else if (op->ospf6_type == OSPF_TYPE_DD) {
941 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
942 ND_TCHECK(ddp->db_options);
943 if (EXTRACT_32BITS(&ddp->db_options) & OSPF6_OPTION_L)
944 lls_dd = 1;
945 }
946 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0)
947 goto trunc;
948 return ospf6_decode_at(ndo, cp + llslen, len - llslen);
949
950 trunc:
951 return 1;
952 }
953
954 void
955 ospf6_print(netdissect_options *ndo,
956 register const u_char *bp, register u_int length)
957 {
958 register const struct ospf6hdr *op;
959 register const u_char *dataend;
960 register const char *cp;
961 uint16_t datalen;
962
963 op = (const struct ospf6hdr *)bp;
964
965 /* If the type is valid translate it, or just print the type */
966 /* value. If it's not valid, say so and return */
967 ND_TCHECK(op->ospf6_type);
968 cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type);
969 ND_PRINT((ndo, "OSPFv%u, %s, length %d", op->ospf6_version, cp, length));
970 if (*cp == 'u') {
971 return;
972 }
973
974 if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
975 return;
976 }
977
978 /* OSPFv3 data always comes first and optional trailing data may follow. */
979 ND_TCHECK(op->ospf6_len);
980 datalen = EXTRACT_16BITS(&op->ospf6_len);
981 if (datalen > length) {
982 ND_PRINT((ndo, " [len %d]", datalen));
983 return;
984 }
985 dataend = bp + datalen;
986
987 ND_TCHECK(op->ospf6_routerid);
988 ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf6_routerid)));
989
990 ND_TCHECK(op->ospf6_areaid);
991 if (EXTRACT_32BITS(&op->ospf6_areaid) != 0)
992 ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf6_areaid)));
993 else
994 ND_PRINT((ndo, ", Backbone Area"));
995 ND_TCHECK(op->ospf6_instanceid);
996 if (op->ospf6_instanceid)
997 ND_PRINT((ndo, ", Instance %u", op->ospf6_instanceid));
998
999 /* Do rest according to version. */
1000 switch (op->ospf6_version) {
1001
1002 case 3:
1003 /* ospf version 3 */
1004 if (ospf6_decode_v3(ndo, op, dataend) ||
1005 ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen))
1006 goto trunc;
1007 break;
1008 } /* end switch on version */
1009
1010 return;
1011 trunc:
1012 ND_PRINT((ndo, "%s", tstr));
1013 }
[mirror] the TCPdump network dissector