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
ospf6_print_ls_type(netdissect_options * ndo,register u_int ls_type,register const rtrid_t * ls_stateid)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
ospf6_print_lshdr(netdissect_options * ndo,register const struct lsa6_hdr * lshp,const u_char * dataend)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_type);
393 ND_TCHECK(lshp->ls_seq);
394
395 ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
396 ipaddr_string(ndo, &lshp->ls_router),
397 EXTRACT_32BITS(&lshp->ls_seq),
398 EXTRACT_16BITS(&lshp->ls_age),
399 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr)));
400
401 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid);
402
403 return (0);
404 trunc:
405 return (1);
406 }
407
408 static int
ospf6_print_lsaprefix(netdissect_options * ndo,const uint8_t * tptr,u_int lsa_length)409 ospf6_print_lsaprefix(netdissect_options *ndo,
410 const uint8_t *tptr, u_int lsa_length)
411 {
412 const struct lsa6_prefix *lsapp = (const struct lsa6_prefix *)tptr;
413 u_int wordlen;
414 struct in6_addr prefix;
415
416 if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES)
417 goto trunc;
418 lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES;
419 ND_TCHECK2(*lsapp, sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES);
420 wordlen = (lsapp->lsa_p_len + 31) / 32;
421 if (wordlen * 4 > sizeof(struct in6_addr)) {
422 ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len));
423 goto trunc;
424 }
425 if (lsa_length < wordlen * 4)
426 goto trunc;
427 lsa_length -= wordlen * 4;
428 ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4);
429 memset(&prefix, 0, sizeof(prefix));
430 memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4);
431 ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix),
432 lsapp->lsa_p_len));
433 if (lsapp->lsa_p_opt) {
434 ND_PRINT((ndo, ", Options [%s]",
435 bittok2str(ospf6_lsa_prefix_option_values,
436 "none", lsapp->lsa_p_opt)));
437 }
438 ND_PRINT((ndo, ", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric)));
439 return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4;
440
441 trunc:
442 return -1;
443 }
444
445
446 /*
447 * Print a single link state advertisement. If truncated return 1, else 0.
448 */
449 static int
ospf6_print_lsa(netdissect_options * ndo,register const struct lsa6 * lsap,const u_char * dataend)450 ospf6_print_lsa(netdissect_options *ndo,
451 register const struct lsa6 *lsap, const u_char *dataend)
452 {
453 register const struct rlalink6 *rlp;
454 #if 0
455 register const struct tos_metric *tosp;
456 #endif
457 register const rtrid_t *ap;
458 #if 0
459 register const struct aslametric *almp;
460 register const struct mcla *mcp;
461 #endif
462 register const struct llsa *llsap;
463 register const struct lsa6_prefix *lsapp;
464 #if 0
465 register const uint32_t *lp;
466 #endif
467 register u_int prefixes;
468 register int bytelen;
469 register u_int length, lsa_length;
470 uint32_t flags32;
471 const uint8_t *tptr;
472
473 if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend))
474 return (1);
475 ND_TCHECK(lsap->ls_hdr.ls_length);
476 length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length);
477
478 /*
479 * The LSA length includes the length of the header;
480 * it must have a value that's at least that length.
481 * If it does, find the length of what follows the
482 * header.
483 */
484 if (length < sizeof(struct lsa6_hdr) || (const u_char *)lsap + length > dataend)
485 return (1);
486 lsa_length = length - sizeof(struct lsa6_hdr);
487 tptr = (const uint8_t *)lsap+sizeof(struct lsa6_hdr);
488
489 switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) {
490 case LS_TYPE_ROUTER | LS_SCOPE_AREA:
491 if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options))
492 return (1);
493 lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options);
494 ND_TCHECK(lsap->lsa_un.un_rla.rla_options);
495 ND_PRINT((ndo, "\n\t Options [%s]",
496 bittok2str(ospf6_option_values, "none",
497 EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options))));
498 ND_PRINT((ndo, ", RLA-Flags [%s]",
499 bittok2str(ospf6_rla_flag_values, "none",
500 lsap->lsa_un.un_rla.rla_flags)));
501
502 rlp = lsap->lsa_un.un_rla.rla_link;
503 while (lsa_length != 0) {
504 if (lsa_length < sizeof (*rlp))
505 return (1);
506 lsa_length -= sizeof (*rlp);
507 ND_TCHECK(*rlp);
508 switch (rlp->link_type) {
509
510 case RLA_TYPE_VIRTUAL:
511 ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID %s"
512 "\n\t Neighbor Interface-ID %s, Interface %s",
513 ipaddr_string(ndo, &rlp->link_nrtid),
514 ipaddr_string(ndo, &rlp->link_nifid),
515 ipaddr_string(ndo, &rlp->link_ifid)));
516 break;
517
518 case RLA_TYPE_ROUTER:
519 ND_PRINT((ndo, "\n\t Neighbor Router-ID %s"
520 "\n\t Neighbor Interface-ID %s, Interface %s",
521 ipaddr_string(ndo, &rlp->link_nrtid),
522 ipaddr_string(ndo, &rlp->link_nifid),
523 ipaddr_string(ndo, &rlp->link_ifid)));
524 break;
525
526 case RLA_TYPE_TRANSIT:
527 ND_PRINT((ndo, "\n\t Neighbor Network-ID %s"
528 "\n\t Neighbor Interface-ID %s, Interface %s",
529 ipaddr_string(ndo, &rlp->link_nrtid),
530 ipaddr_string(ndo, &rlp->link_nifid),
531 ipaddr_string(ndo, &rlp->link_ifid)));
532 break;
533
534 default:
535 ND_PRINT((ndo, "\n\t Unknown Router Links Type 0x%02x",
536 rlp->link_type));
537 return (0);
538 }
539 ND_PRINT((ndo, ", metric %d", EXTRACT_16BITS(&rlp->link_metric)));
540 rlp++;
541 }
542 break;
543
544 case LS_TYPE_NETWORK | LS_SCOPE_AREA:
545 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options))
546 return (1);
547 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options);
548 ND_TCHECK(lsap->lsa_un.un_nla.nla_options);
549 ND_PRINT((ndo, "\n\t Options [%s]",
550 bittok2str(ospf6_option_values, "none",
551 EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options))));
552
553 ND_PRINT((ndo, "\n\t Connected Routers:"));
554 ap = lsap->lsa_un.un_nla.nla_router;
555 while (lsa_length != 0) {
556 if (lsa_length < sizeof (*ap))
557 return (1);
558 lsa_length -= sizeof (*ap);
559 ND_TCHECK(*ap);
560 ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, ap)));
561 ++ap;
562 }
563 break;
564
565 case LS_TYPE_INTER_AP | LS_SCOPE_AREA:
566 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric))
567 return (1);
568 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric);
569 ND_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric);
570 ND_PRINT((ndo, ", metric %u",
571 EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC));
572
573 tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix;
574 while (lsa_length != 0) {
575 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
576 if (bytelen < 0)
577 goto trunc;
578 lsa_length -= bytelen;
579 tptr += bytelen;
580 }
581 break;
582
583 case LS_TYPE_ASE | LS_SCOPE_AS:
584 if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric))
585 return (1);
586 lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric);
587 ND_TCHECK(lsap->lsa_un.un_asla.asla_metric);
588 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric);
589 ND_PRINT((ndo, "\n\t Flags [%s]",
590 bittok2str(ospf6_asla_flag_values, "none", flags32)));
591 ND_PRINT((ndo, " metric %u",
592 EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) &
593 ASLA_MASK_METRIC));
594
595 tptr = (const uint8_t *)lsap->lsa_un.un_asla.asla_prefix;
596 lsapp = (const struct lsa6_prefix *)tptr;
597 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
598 if (bytelen < 0)
599 goto trunc;
600 lsa_length -= bytelen;
601 tptr += bytelen;
602
603 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
604 const struct in6_addr *fwdaddr6;
605
606 fwdaddr6 = (const struct in6_addr *)tptr;
607 if (lsa_length < sizeof (*fwdaddr6))
608 return (1);
609 lsa_length -= sizeof (*fwdaddr6);
610 ND_TCHECK(*fwdaddr6);
611 ND_PRINT((ndo, " forward %s",
612 ip6addr_string(ndo, fwdaddr6)));
613 tptr += sizeof(*fwdaddr6);
614 }
615
616 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
617 if (lsa_length < sizeof (uint32_t))
618 return (1);
619 lsa_length -= sizeof (uint32_t);
620 ND_TCHECK(*(const uint32_t *)tptr);
621 ND_PRINT((ndo, " tag %s",
622 ipaddr_string(ndo, (const uint32_t *)tptr)));
623 tptr += sizeof(uint32_t);
624 }
625
626 if (lsapp->lsa_p_metric) {
627 if (lsa_length < sizeof (uint32_t))
628 return (1);
629 lsa_length -= sizeof (uint32_t);
630 ND_TCHECK(*(const uint32_t *)tptr);
631 ND_PRINT((ndo, " RefLSID: %s",
632 ipaddr_string(ndo, (const uint32_t *)tptr)));
633 tptr += sizeof(uint32_t);
634 }
635 break;
636
637 case LS_TYPE_LINK:
638 /* Link LSA */
639 llsap = &lsap->lsa_un.un_llsa;
640 if (lsa_length < sizeof (llsap->llsa_priandopt))
641 return (1);
642 lsa_length -= sizeof (llsap->llsa_priandopt);
643 ND_TCHECK(llsap->llsa_priandopt);
644 ND_PRINT((ndo, "\n\t Options [%s]",
645 bittok2str(ospf6_option_values, "none",
646 EXTRACT_32BITS(&llsap->llsa_options))));
647
648 if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix))
649 return (1);
650 lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix);
651 ND_TCHECK(llsap->llsa_nprefix);
652 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix);
653 ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:",
654 llsap->llsa_priority,
655 ip6addr_string(ndo, &llsap->llsa_lladdr),
656 prefixes));
657
658 tptr = (const uint8_t *)llsap->llsa_prefix;
659 while (prefixes > 0) {
660 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
661 if (bytelen < 0)
662 goto trunc;
663 prefixes--;
664 lsa_length -= bytelen;
665 tptr += bytelen;
666 }
667 break;
668
669 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA:
670 /* Intra-Area-Prefix LSA */
671 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid))
672 return (1);
673 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid);
674 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
675 ospf6_print_ls_type(ndo,
676 EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype),
677 &lsap->lsa_un.un_intra_ap.intra_ap_lsid);
678
679 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix))
680 return (1);
681 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
682 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
683 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
684 ND_PRINT((ndo, "\n\t Prefixes %d:", prefixes));
685
686 tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
687 while (prefixes > 0) {
688 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
689 if (bytelen < 0)
690 goto trunc;
691 prefixes--;
692 lsa_length -= bytelen;
693 tptr += bytelen;
694 }
695 break;
696
697 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
698 if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) {
699 return 1;
700 }
701 break;
702
703 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
704 if (ospf_print_te_lsa(ndo, tptr, lsa_length) == -1) {
705 return 1;
706 }
707 break;
708
709 default:
710 if(!print_unknown_data(ndo,tptr,
711 "\n\t ",
712 lsa_length)) {
713 return (1);
714 }
715 break;
716 }
717
718 return (0);
719 trunc:
720 return (1);
721 }
722
723 static int
ospf6_decode_v3(netdissect_options * ndo,register const struct ospf6hdr * op,register const u_char * dataend)724 ospf6_decode_v3(netdissect_options *ndo,
725 register const struct ospf6hdr *op,
726 register const u_char *dataend)
727 {
728 register const rtrid_t *ap;
729 register const struct lsr6 *lsrp;
730 register const struct lsa6_hdr *lshp;
731 register const struct lsa6 *lsap;
732 register int i;
733
734 switch (op->ospf6_type) {
735
736 case OSPF_TYPE_HELLO: {
737 register const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
738
739 ND_TCHECK_32BITS(&hellop->hello_options);
740 ND_PRINT((ndo, "\n\tOptions [%s]",
741 bittok2str(ospf6_option_values, "none",
742 EXTRACT_32BITS(&hellop->hello_options))));
743
744 ND_TCHECK(hellop->hello_deadint);
745 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
746 EXTRACT_16BITS(&hellop->hello_helloint),
747 EXTRACT_16BITS(&hellop->hello_deadint),
748 ipaddr_string(ndo, &hellop->hello_ifid),
749 hellop->hello_priority));
750
751 ND_TCHECK(hellop->hello_dr);
752 if (EXTRACT_32BITS(&hellop->hello_dr) != 0)
753 ND_PRINT((ndo, "\n\t Designated Router %s",
754 ipaddr_string(ndo, &hellop->hello_dr)));
755 ND_TCHECK(hellop->hello_bdr);
756 if (EXTRACT_32BITS(&hellop->hello_bdr) != 0)
757 ND_PRINT((ndo, ", Backup Designated Router %s",
758 ipaddr_string(ndo, &hellop->hello_bdr)));
759 if (ndo->ndo_vflag > 1) {
760 ND_PRINT((ndo, "\n\t Neighbor List:"));
761 ap = hellop->hello_neighbor;
762 while ((const u_char *)ap < dataend) {
763 ND_TCHECK(*ap);
764 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap)));
765 ++ap;
766 }
767 }
768 break; /* HELLO */
769 }
770
771 case OSPF_TYPE_DD: {
772 register const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
773
774 ND_TCHECK(ddp->db_options);
775 ND_PRINT((ndo, "\n\tOptions [%s]",
776 bittok2str(ospf6_option_values, "none",
777 EXTRACT_32BITS(&ddp->db_options))));
778 ND_TCHECK(ddp->db_flags);
779 ND_PRINT((ndo, ", DD Flags [%s]",
780 bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags)));
781
782 ND_TCHECK(ddp->db_seq);
783 ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x",
784 EXTRACT_16BITS(&ddp->db_mtu),
785 EXTRACT_32BITS(&ddp->db_seq)));
786 if (ndo->ndo_vflag > 1) {
787 /* Print all the LS adv's */
788 lshp = ddp->db_lshdr;
789 while ((const u_char *)lshp < dataend) {
790 if (ospf6_print_lshdr(ndo, lshp++, dataend))
791 goto trunc;
792 }
793 }
794 break;
795 }
796
797 case OSPF_TYPE_LS_REQ:
798 if (ndo->ndo_vflag > 1) {
799 lsrp = (const struct lsr6 *)((const uint8_t *)op + OSPF6HDR_LEN);
800 while ((const u_char *)lsrp < dataend) {
801 ND_TCHECK(*lsrp);
802 ND_PRINT((ndo, "\n\t Advertising Router %s",
803 ipaddr_string(ndo, &lsrp->ls_router)));
804 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type),
805 &lsrp->ls_stateid);
806 ++lsrp;
807 }
808 }
809 break;
810
811 case OSPF_TYPE_LS_UPDATE:
812 if (ndo->ndo_vflag > 1) {
813 register const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN);
814
815 ND_TCHECK(lsup->lsu_count);
816 i = EXTRACT_32BITS(&lsup->lsu_count);
817 lsap = lsup->lsu_lsa;
818 while ((const u_char *)lsap < dataend && i--) {
819 if (ospf6_print_lsa(ndo, lsap, dataend))
820 goto trunc;
821 lsap = (const struct lsa6 *)((const u_char *)lsap +
822 EXTRACT_16BITS(&lsap->ls_hdr.ls_length));
823 }
824 }
825 break;
826
827 case OSPF_TYPE_LS_ACK:
828 if (ndo->ndo_vflag > 1) {
829 lshp = (const struct lsa6_hdr *)((const uint8_t *)op + OSPF6HDR_LEN);
830 while ((const u_char *)lshp < dataend) {
831 if (ospf6_print_lshdr(ndo, lshp++, dataend))
832 goto trunc;
833 }
834 }
835 break;
836
837 default:
838 break;
839 }
840 return (0);
841 trunc:
842 return (1);
843 }
844
845 /* RFC5613 Section 2.2 (w/o the TLVs) */
846 static int
ospf6_print_lls(netdissect_options * ndo,const u_char * cp,const u_int len)847 ospf6_print_lls(netdissect_options *ndo,
848 const u_char *cp, const u_int len)
849 {
850 uint16_t llsdatalen;
851
852 if (len == 0)
853 return 0;
854 if (len < OSPF_LLS_HDRLEN)
855 goto trunc;
856 /* Checksum */
857 ND_TCHECK2(*cp, 2);
858 ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp)));
859 cp += 2;
860 /* LLS Data Length */
861 ND_TCHECK2(*cp, 2);
862 llsdatalen = EXTRACT_16BITS(cp);
863 ND_PRINT((ndo, ", Data Length %u", llsdatalen));
864 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
865 goto trunc;
866 cp += 2;
867 /* LLS TLVs */
868 ND_TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN);
869 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */
870
871 return llsdatalen;
872 trunc:
873 return -1;
874 }
875
876 /* RFC6506 Section 4.1 */
877 static int
ospf6_decode_at(netdissect_options * ndo,const u_char * cp,const u_int len)878 ospf6_decode_at(netdissect_options *ndo,
879 const u_char *cp, const u_int len)
880 {
881 uint16_t authdatalen;
882
883 if (len == 0)
884 return 0;
885 if (len < OSPF6_AT_HDRLEN)
886 goto trunc;
887 /* Authentication Type */
888 ND_TCHECK2(*cp, 2);
889 ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp))));
890 cp += 2;
891 /* Auth Data Len */
892 ND_TCHECK2(*cp, 2);
893 authdatalen = EXTRACT_16BITS(cp);
894 ND_PRINT((ndo, ", Length %u", authdatalen));
895 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
896 goto trunc;
897 cp += 2;
898 /* Reserved */
899 ND_TCHECK2(*cp, 2);
900 cp += 2;
901 /* Security Association ID */
902 ND_TCHECK2(*cp, 2);
903 ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp)));
904 cp += 2;
905 /* Cryptographic Sequence Number (High-Order 32 Bits) */
906 ND_TCHECK2(*cp, 4);
907 ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp)));
908 cp += 4;
909 /* Cryptographic Sequence Number (Low-Order 32 Bits) */
910 ND_TCHECK2(*cp, 4);
911 ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp)));
912 cp += 4;
913 /* Authentication Data */
914 ND_TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN);
915 if (ndo->ndo_vflag > 1)
916 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN);
917 return 0;
918
919 trunc:
920 return 1;
921 }
922
923 /* The trailing data may include LLS and/or AT data (in this specific order).
924 * LLS data may be present only in Hello and DBDesc packets with the L-bit set.
925 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in
926 * any other packet type, thus decode the AT data regardless of the AT-bit.
927 */
928 static int
ospf6_decode_v3_trailer(netdissect_options * ndo,const struct ospf6hdr * op,const u_char * cp,const unsigned len)929 ospf6_decode_v3_trailer(netdissect_options *ndo,
930 const struct ospf6hdr *op, const u_char *cp, const unsigned len)
931 {
932 int llslen = 0;
933 int lls_hello = 0;
934 int lls_dd = 0;
935
936 if (op->ospf6_type == OSPF_TYPE_HELLO) {
937 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
938 ND_TCHECK(hellop->hello_options);
939 if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L)
940 lls_hello = 1;
941 } else if (op->ospf6_type == OSPF_TYPE_DD) {
942 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
943 ND_TCHECK(ddp->db_options);
944 if (EXTRACT_32BITS(&ddp->db_options) & OSPF6_OPTION_L)
945 lls_dd = 1;
946 }
947 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0)
948 goto trunc;
949 return ospf6_decode_at(ndo, cp + llslen, len - llslen);
950
951 trunc:
952 return 1;
953 }
954
955 void
ospf6_print(netdissect_options * ndo,register const u_char * bp,register u_int length)956 ospf6_print(netdissect_options *ndo,
957 register const u_char *bp, register u_int length)
958 {
959 register const struct ospf6hdr *op;
960 register const u_char *dataend;
961 register const char *cp;
962 uint16_t datalen;
963
964 op = (const struct ospf6hdr *)bp;
965
966 /* If the type is valid translate it, or just print the type */
967 /* value. If it's not valid, say so and return */
968 ND_TCHECK(op->ospf6_type);
969 cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type);
970 ND_PRINT((ndo, "OSPFv%u, %s, length %d", op->ospf6_version, cp, length));
971 if (*cp == 'u') {
972 return;
973 }
974
975 if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
976 return;
977 }
978
979 /* OSPFv3 data always comes first and optional trailing data may follow. */
980 ND_TCHECK(op->ospf6_len);
981 datalen = EXTRACT_16BITS(&op->ospf6_len);
982 if (datalen > length) {
983 ND_PRINT((ndo, " [len %d]", datalen));
984 return;
985 }
986 dataend = bp + datalen;
987
988 ND_TCHECK(op->ospf6_routerid);
989 ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf6_routerid)));
990
991 ND_TCHECK(op->ospf6_areaid);
992 if (EXTRACT_32BITS(&op->ospf6_areaid) != 0)
993 ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf6_areaid)));
994 else
995 ND_PRINT((ndo, ", Backbone Area"));
996 ND_TCHECK(op->ospf6_instanceid);
997 if (op->ospf6_instanceid)
998 ND_PRINT((ndo, ", Instance %u", op->ospf6_instanceid));
999
1000 /* Do rest according to version. */
1001 switch (op->ospf6_version) {
1002
1003 case 3:
1004 /* ospf version 3 */
1005 if (ospf6_decode_v3(ndo, op, dataend) ||
1006 ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen))
1007 goto trunc;
1008 break;
1009 } /* end switch on version */
1010
1011 return;
1012 trunc:
1013 ND_PRINT((ndo, "%s", tstr));
1014 }
1015