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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 <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 uint32_t rtrid_t;
121  
122 /* link state advertisement header */
123 struct lsa6_hdr {
124 uint16_t ls_age;
125 uint16_t ls_type;
126 rtrid_t ls_stateid;
127 rtrid_t ls_router;
128 uint32_t ls_seq;
129 uint16_t ls_chksum;
130 uint16_t ls_length;
131 };
132  
133 /* Length of an IPv6 address, in bytes. */
134 #define IPV6_ADDR_LEN_BYTES (128/8)
135  
136 struct lsa6_prefix {
137 uint8_t lsa_p_len;
138 uint8_t lsa_p_opt;
139 uint16_t lsa_p_metric;
140 uint8_t lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */
141 };
142  
143 /* link state advertisement */
144 struct lsa6 {
145 struct lsa6_hdr ls_hdr;
146  
147 /* Link state types */
148 union {
149 /* Router links advertisements */
150 struct {
151 union {
152 uint8_t flg;
153 uint32_t opt;
154 } rla_flgandopt;
155 #define rla_flags rla_flgandopt.flg
156 #define rla_options rla_flgandopt.opt
157 struct rlalink6 {
158 uint8_t link_type;
159 uint8_t link_zero[1];
160 uint16_t link_metric;
161 uint32_t link_ifid;
162 uint32_t link_nifid;
163 rtrid_t link_nrtid;
164 } rla_link[1]; /* may repeat */
165 } un_rla;
166  
167 /* Network links advertisements */
168 struct {
169 uint32_t nla_options;
170 rtrid_t nla_router[1]; /* may repeat */
171 } un_nla;
172  
173 /* Inter Area Prefix LSA */
174 struct {
175 uint32_t inter_ap_metric;
176 struct lsa6_prefix inter_ap_prefix[1];
177 } un_inter_ap;
178  
179 /* AS external links advertisements */
180 struct {
181 uint32_t asla_metric;
182 struct lsa6_prefix asla_prefix[1];
183 /* some optional fields follow */
184 } un_asla;
185  
186 #if 0
187 /* Summary links advertisements */
188 struct {
189 struct in_addr sla_mask;
190 uint32_t sla_tosmetric[1]; /* may repeat */
191 } un_sla;
192  
193 /* Multicast group membership */
194 struct mcla {
195 uint32_t mcla_vtype;
196 struct in_addr mcla_vid;
197 } un_mcla[1];
198 #endif
199  
200 /* Type 7 LSA */
201  
202 /* Link LSA */
203 struct llsa {
204 union {
205 uint8_t pri;
206 uint32_t opt;
207 } llsa_priandopt;
208 #define llsa_priority llsa_priandopt.pri
209 #define llsa_options llsa_priandopt.opt
210 struct in6_addr llsa_lladdr;
211 uint32_t llsa_nprefix;
212 struct lsa6_prefix llsa_prefix[1];
213 } un_llsa;
214  
215 /* Intra-Area-Prefix */
216 struct {
217 uint16_t intra_ap_nprefix;
218 uint16_t intra_ap_lstype;
219 rtrid_t intra_ap_lsid;
220 rtrid_t intra_ap_rtid;
221 struct lsa6_prefix intra_ap_prefix[1];
222 } un_intra_ap;
223 } lsa_un;
224 };
225  
226 /*
227 * the main header
228 */
229 struct ospf6hdr {
230 uint8_t ospf6_version;
231 uint8_t ospf6_type;
232 uint16_t ospf6_len;
233 rtrid_t ospf6_routerid;
234 rtrid_t ospf6_areaid;
235 uint16_t ospf6_chksum;
236 uint8_t ospf6_instanceid;
237 uint8_t ospf6_rsvd;
238 };
239  
240 /*
241 * The OSPF6 header length is 16 bytes, regardless of how your compiler
242 * might choose to pad the above structure.
243 */
244 #define OSPF6HDR_LEN 16
245  
246 /* Hello packet */
247 struct hello6 {
248 uint32_t hello_ifid;
249 union {
250 uint8_t pri;
251 uint32_t opt;
252 } hello_priandopt;
253 #define hello_priority hello_priandopt.pri
254 #define hello_options hello_priandopt.opt
255 uint16_t hello_helloint;
256 uint16_t hello_deadint;
257 rtrid_t hello_dr;
258 rtrid_t hello_bdr;
259 rtrid_t hello_neighbor[1]; /* may repeat */
260 };
261  
262 /* Database Description packet */
263 struct dd6 {
264 uint32_t db_options;
265 uint16_t db_mtu;
266 uint8_t db_mbz;
267 uint8_t db_flags;
268 uint32_t db_seq;
269 struct lsa6_hdr db_lshdr[1]; /* may repeat */
270 };
271  
272 /* Link State Request */
273 struct lsr6 {
274 uint16_t ls_mbz;
275 uint16_t ls_type;
276 rtrid_t ls_stateid;
277 rtrid_t ls_router;
278 };
279  
280 /* Link State Update */
281 struct lsu6 {
282 uint32_t lsu_count;
283 struct lsa6 lsu_lsa[1]; /* may repeat */
284 };
285  
286 static const char tstr[] = " [|ospf3]";
287  
288 static const struct tok ospf6_option_values[] = {
289 { OSPF6_OPTION_V6, "V6" },
290 { OSPF6_OPTION_E, "External" },
291 { OSPF6_OPTION_MC, "Deprecated" },
292 { OSPF6_OPTION_N, "NSSA" },
293 { OSPF6_OPTION_R, "Router" },
294 { OSPF6_OPTION_DC, "Demand Circuit" },
295 { OSPF6_OPTION_AF, "AFs Support" },
296 { OSPF6_OPTION_L, "LLS" },
297 { OSPF6_OPTION_AT, "Authentication Trailer" },
298 { 0, NULL }
299 };
300  
301 static const struct tok ospf6_rla_flag_values[] = {
302 { RLA_FLAG_B, "ABR" },
303 { RLA_FLAG_E, "External" },
304 { RLA_FLAG_V, "Virtual-Link Endpoint" },
305 { RLA_FLAG_W, "Wildcard Receiver" },
306 { RLA_FLAG_N, "NSSA Translator" },
307 { 0, NULL }
308 };
309  
310 static const struct tok ospf6_asla_flag_values[] = {
311 { ASLA_FLAG_EXTERNAL, "External Type 2" },
312 { ASLA_FLAG_FWDADDR, "Forwarding" },
313 { ASLA_FLAG_ROUTETAG, "Tag" },
314 { 0, NULL }
315 };
316  
317 static const struct tok ospf6_type_values[] = {
318 { OSPF_TYPE_HELLO, "Hello" },
319 { OSPF_TYPE_DD, "Database Description" },
320 { OSPF_TYPE_LS_REQ, "LS-Request" },
321 { OSPF_TYPE_LS_UPDATE, "LS-Update" },
322 { OSPF_TYPE_LS_ACK, "LS-Ack" },
323 { 0, NULL }
324 };
325  
326 static const struct tok ospf6_lsa_values[] = {
327 { LS_TYPE_ROUTER, "Router" },
328 { LS_TYPE_NETWORK, "Network" },
329 { LS_TYPE_INTER_AP, "Inter-Area Prefix" },
330 { LS_TYPE_INTER_AR, "Inter-Area Router" },
331 { LS_TYPE_ASE, "External" },
332 { LS_TYPE_GROUP, "Deprecated" },
333 { LS_TYPE_NSSA, "NSSA" },
334 { LS_TYPE_LINK, "Link" },
335 { LS_TYPE_INTRA_AP, "Intra-Area Prefix" },
336 { LS_TYPE_INTRA_ATE, "Intra-Area TE" },
337 { LS_TYPE_GRACE, "Grace" },
338 { LS_TYPE_RI, "Router Information" },
339 { LS_TYPE_INTER_ASTE, "Inter-AS-TE" },
340 { LS_TYPE_L1VPN, "Layer 1 VPN" },
341 { 0, NULL }
342 };
343  
344 static const struct tok ospf6_ls_scope_values[] = {
345 { LS_SCOPE_LINKLOCAL, "Link Local" },
346 { LS_SCOPE_AREA, "Area Local" },
347 { LS_SCOPE_AS, "Domain Wide" },
348 { 0, NULL }
349 };
350  
351 static const struct tok ospf6_dd_flag_values[] = {
352 { OSPF6_DB_INIT, "Init" },
353 { OSPF6_DB_MORE, "More" },
354 { OSPF6_DB_MASTER, "Master" },
355 { OSPF6_DB_M6, "IPv6 MTU" },
356 { 0, NULL }
357 };
358  
359 static const struct tok ospf6_lsa_prefix_option_values[] = {
360 { LSA_PREFIX_OPT_NU, "No Unicast" },
361 { LSA_PREFIX_OPT_LA, "Local address" },
362 { LSA_PREFIX_OPT_MC, "Deprecated" },
363 { LSA_PREFIX_OPT_P, "Propagate" },
364 { LSA_PREFIX_OPT_DN, "Down" },
365 { 0, NULL }
366 };
367  
368 static const struct tok ospf6_auth_type_str[] = {
369 { OSPF6_AUTH_TYPE_HMAC, "HMAC" },
370 { 0, NULL }
371 };
372  
373 static void
374 ospf6_print_ls_type(netdissect_options *ndo,
375 register u_int ls_type, register const rtrid_t *ls_stateid)
376 {
377 ND_PRINT((ndo, "\n\t %s LSA (%d), %s Scope%s, LSA-ID %s",
378 tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK),
379 ls_type & LS_TYPE_MASK,
380 tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK),
381 ls_type &0x8000 ? ", transitive" : "", /* U-bit */
382 ipaddr_string(ndo, ls_stateid)));
383 }
384  
385 static int
386 ospf6_print_lshdr(netdissect_options *ndo,
387 register const struct lsa6_hdr *lshp, const u_char *dataend)
388 {
389 if ((u_char *)(lshp + 1) > dataend)
390 goto trunc;
391 ND_TCHECK(lshp->ls_type);
392 ND_TCHECK(lshp->ls_seq);
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 = (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) || (u_char *)lsap + length > dataend)
484 return (1);
485 lsa_length = length - sizeof(struct lsa6_hdr);
486 tptr = (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 = (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 = (uint8_t *)lsap->lsa_un.un_asla.asla_prefix;
595 lsapp = (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 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 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(*(uint32_t *)tptr);
620 ND_PRINT((ndo, " tag %s",
621 ipaddr_string(ndo, (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(*(uint32_t *)tptr);
630 ND_PRINT((ndo, " RefLSID: %s",
631 ipaddr_string(ndo, (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 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix);
651 ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:",
652 llsap->llsa_priority,
653 ip6addr_string(ndo, &llsap->llsa_lladdr),
654 prefixes));
655  
656 tptr = (uint8_t *)llsap->llsa_prefix;
657 while (prefixes > 0) {
658 bytelen = ospf6_print_lsaprefix(ndo, 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 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
673 ospf6_print_ls_type(ndo,
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 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
681 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
682 ND_PRINT((ndo, "\n\t Prefixes %d:", prefixes));
683  
684 tptr = (uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
685 while (prefixes > 0) {
686 bytelen = ospf6_print_lsaprefix(ndo, 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(ndo, 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(ndo, tptr, lsa_length) == -1) {
703 return 1;
704 }
705 break;
706  
707 default:
708 if(!print_unknown_data(ndo,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(netdissect_options *ndo,
723 register const struct ospf6hdr *op,
724 register const u_char *dataend)
725 {
726 register const rtrid_t *ap;
727 register const struct lsr6 *lsrp;
728 register const struct lsa6_hdr *lshp;
729 register const struct lsa6 *lsap;
730 register int i;
731  
732 switch (op->ospf6_type) {
733  
734 case OSPF_TYPE_HELLO: {
735 register const struct hello6 *hellop = (const struct hello6 *)((uint8_t *)op + OSPF6HDR_LEN);
736  
737 ND_PRINT((ndo, "\n\tOptions [%s]",
738 bittok2str(ospf6_option_values, "none",
739 EXTRACT_32BITS(&hellop->hello_options))));
740  
741 ND_TCHECK(hellop->hello_deadint);
742 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
743 EXTRACT_16BITS(&hellop->hello_helloint),
744 EXTRACT_16BITS(&hellop->hello_deadint),
745 ipaddr_string(ndo, &hellop->hello_ifid),
746 hellop->hello_priority));
747  
748 ND_TCHECK(hellop->hello_dr);
749 if (EXTRACT_32BITS(&hellop->hello_dr) != 0)
750 ND_PRINT((ndo, "\n\t Designated Router %s",
751 ipaddr_string(ndo, &hellop->hello_dr)));
752 ND_TCHECK(hellop->hello_bdr);
753 if (EXTRACT_32BITS(&hellop->hello_bdr) != 0)
754 ND_PRINT((ndo, ", Backup Designated Router %s",
755 ipaddr_string(ndo, &hellop->hello_bdr)));
756 if (ndo->ndo_vflag > 1) {
757 ND_PRINT((ndo, "\n\t Neighbor List:"));
758 ap = hellop->hello_neighbor;
759 while ((u_char *)ap < dataend) {
760 ND_TCHECK(*ap);
761 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap)));
762 ++ap;
763 }
764 }
765 break; /* HELLO */
766 }
767  
768 case OSPF_TYPE_DD: {
769 register const struct dd6 *ddp = (const struct dd6 *)((uint8_t *)op + OSPF6HDR_LEN);
770  
771 ND_TCHECK(ddp->db_options);
772 ND_PRINT((ndo, "\n\tOptions [%s]",
773 bittok2str(ospf6_option_values, "none",
774 EXTRACT_32BITS(&ddp->db_options))));
775 ND_TCHECK(ddp->db_flags);
776 ND_PRINT((ndo, ", DD Flags [%s]",
777 bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags)));
778  
779 ND_TCHECK(ddp->db_seq);
780 ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x",
781 EXTRACT_16BITS(&ddp->db_mtu),
782 EXTRACT_32BITS(&ddp->db_seq)));
783 if (ndo->ndo_vflag > 1) {
784 /* Print all the LS adv's */
785 lshp = ddp->db_lshdr;
786 while ((u_char *)lshp < dataend) {
787 if (ospf6_print_lshdr(ndo, lshp++, dataend))
788 goto trunc;
789 }
790 }
791 break;
792 }
793  
794 case OSPF_TYPE_LS_REQ:
795 if (ndo->ndo_vflag > 1) {
796 lsrp = (const struct lsr6 *)((uint8_t *)op + OSPF6HDR_LEN);
797 while ((u_char *)lsrp < dataend) {
798 ND_TCHECK(*lsrp);
799 ND_PRINT((ndo, "\n\t Advertising Router %s",
800 ipaddr_string(ndo, &lsrp->ls_router)));
801 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type),
802 &lsrp->ls_stateid);
803 ++lsrp;
804 }
805 }
806 break;
807  
808 case OSPF_TYPE_LS_UPDATE:
809 if (ndo->ndo_vflag > 1) {
810 register const struct lsu6 *lsup = (const struct lsu6 *)((uint8_t *)op + OSPF6HDR_LEN);
811  
812 ND_TCHECK(lsup->lsu_count);
813 i = EXTRACT_32BITS(&lsup->lsu_count);
814 lsap = lsup->lsu_lsa;
815 while ((u_char *)lsap < dataend && i--) {
816 if (ospf6_print_lsa(ndo, lsap, dataend))
817 goto trunc;
818 lsap = (struct lsa6 *)((u_char *)lsap +
819 EXTRACT_16BITS(&lsap->ls_hdr.ls_length));
820 }
821 }
822 break;
823  
824 case OSPF_TYPE_LS_ACK:
825 if (ndo->ndo_vflag > 1) {
826 lshp = (const struct lsa6_hdr *)((uint8_t *)op + OSPF6HDR_LEN);
827 while ((u_char *)lshp < dataend) {
828 if (ospf6_print_lshdr(ndo, lshp++, dataend))
829 goto trunc;
830 }
831 }
832 break;
833  
834 default:
835 break;
836 }
837 return (0);
838 trunc:
839 return (1);
840 }
841  
842 /* RFC5613 Section 2.2 (w/o the TLVs) */
843 static int
844 ospf6_print_lls(netdissect_options *ndo,
845 const u_char *cp, const u_int len)
846 {
847 uint16_t llsdatalen;
848  
849 if (len == 0)
850 return 0;
851 if (len < OSPF_LLS_HDRLEN)
852 goto trunc;
853 /* Checksum */
854 ND_TCHECK2(*cp, 2);
855 ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp)));
856 cp += 2;
857 /* LLS Data Length */
858 ND_TCHECK2(*cp, 2);
859 llsdatalen = EXTRACT_16BITS(cp);
860 ND_PRINT((ndo, ", Data Length %u", llsdatalen));
861 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
862 goto trunc;
863 cp += 2;
864 /* LLS TLVs */
865 ND_TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN);
866 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */
867  
868 return llsdatalen;
869 trunc:
870 return -1;
871 }
872  
873 /* RFC6506 Section 4.1 */
874 static int
875 ospf6_decode_at(netdissect_options *ndo,
876 const u_char *cp, const u_int len)
877 {
878 uint16_t authdatalen;
879  
880 if (len == 0)
881 return 0;
882 if (len < OSPF6_AT_HDRLEN)
883 goto trunc;
884 /* Authentication Type */
885 ND_TCHECK2(*cp, 2);
886 ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp))));
887 cp += 2;
888 /* Auth Data Len */
889 ND_TCHECK2(*cp, 2);
890 authdatalen = EXTRACT_16BITS(cp);
891 ND_PRINT((ndo, ", Length %u", authdatalen));
892 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
893 goto trunc;
894 cp += 2;
895 /* Reserved */
896 ND_TCHECK2(*cp, 2);
897 cp += 2;
898 /* Security Association ID */
899 ND_TCHECK2(*cp, 2);
900 ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp)));
901 cp += 2;
902 /* Cryptographic Sequence Number (High-Order 32 Bits) */
903 ND_TCHECK2(*cp, 4);
904 ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp)));
905 cp += 4;
906 /* Cryptographic Sequence Number (Low-Order 32 Bits) */
907 ND_TCHECK2(*cp, 4);
908 ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp)));
909 cp += 4;
910 /* Authentication Data */
911 ND_TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN);
912 if (ndo->ndo_vflag > 1)
913 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN);
914 return 0;
915  
916 trunc:
917 return 1;
918 }
919  
920 /* The trailing data may include LLS and/or AT data (in this specific order).
921 * LLS data may be present only in Hello and DBDesc packets with the L-bit set.
922 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in
923 * any other packet type, thus decode the AT data regardless of the AT-bit.
924 */
925 static int
926 ospf6_decode_v3_trailer(netdissect_options *ndo,
927 const struct ospf6hdr *op, const u_char *cp, const unsigned len)
928 {
929 int llslen = 0;
930 int lls_hello = 0;
931 int lls_dd = 0;
932  
933 if (op->ospf6_type == OSPF_TYPE_HELLO) {
934 const struct hello6 *hellop = (const struct hello6 *)((uint8_t *)op + OSPF6HDR_LEN);
935 if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L)
936 lls_hello = 1;
937 } else if (op->ospf6_type == OSPF_TYPE_DD) {
938 const struct dd6 *ddp = (const struct dd6 *)((uint8_t *)op + OSPF6HDR_LEN);
939 if (EXTRACT_32BITS(&ddp->db_options) & OSPF6_OPTION_L)
940 lls_dd = 1;
941 }
942 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0)
943 goto trunc;
944 return ospf6_decode_at(ndo, cp + llslen, len - llslen);
945  
946 trunc:
947 return 1;
948 }
949  
950 void
951 ospf6_print(netdissect_options *ndo,
952 register const u_char *bp, register u_int length)
953 {
954 register const struct ospf6hdr *op;
955 register const u_char *dataend;
956 register const char *cp;
957 uint16_t datalen;
958  
959 op = (struct ospf6hdr *)bp;
960  
961 /* If the type is valid translate it, or just print the type */
962 /* value. If it's not valid, say so and return */
963 ND_TCHECK(op->ospf6_type);
964 cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type);
965 ND_PRINT((ndo, "OSPFv%u, %s, length %d", op->ospf6_version, cp, length));
966 if (*cp == 'u') {
967 return;
968 }
969  
970 if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
971 return;
972 }
973  
974 /* OSPFv3 data always comes first and optional trailing data may follow. */
975 ND_TCHECK(op->ospf6_len);
976 datalen = EXTRACT_16BITS(&op->ospf6_len);
977 if (datalen > length) {
978 ND_PRINT((ndo, " [len %d]", datalen));
979 return;
980 }
981 dataend = bp + datalen;
982  
983 ND_TCHECK(op->ospf6_routerid);
984 ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf6_routerid)));
985  
986 ND_TCHECK(op->ospf6_areaid);
987 if (EXTRACT_32BITS(&op->ospf6_areaid) != 0)
988 ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf6_areaid)));
989 else
990 ND_PRINT((ndo, ", Backbone Area"));
991 ND_TCHECK(op->ospf6_instanceid);
992 if (op->ospf6_instanceid)
993 ND_PRINT((ndo, ", Instance %u", op->ospf6_instanceid));
994  
995 /* Do rest according to version. */
996 switch (op->ospf6_version) {
997  
998 case 3:
999 /* ospf version 3 */
1000 if (ospf6_decode_v3(ndo, op, dataend) ||
1001 ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen))
1002 goto trunc;
1003 break;
1004 } /* end switch on version */
1005  
1006 return;
1007 trunc:
1008 ND_PRINT((ndo, "%s", tstr));
1009 }