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etc/services - sync with NetBSD-8
[minix.git] / external / bsd / tcpdump / dist / print-ospf6.c
blob8b88f4b3f054b3c801327aa588f7eb1764e844f9
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 #include <sys/cdefs.h>
25 #ifndef lint
26 __RCSID("$NetBSD: print-ospf6.c,v 1.5 2014/11/20 03:05:03 christos Exp $");
27 #endif
28
29 #define NETDISSECT_REWORKED
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #include <tcpdump-stdinc.h>
35
36 #include <string.h>
37
38 #include "interface.h"
39 #include "addrtoname.h"
40 #include "extract.h"
41
42 #include "ospf.h"
43
44 #define OSPF_TYPE_HELLO 1 /* Hello */
45 #define OSPF_TYPE_DD 2 /* Database Description */
46 #define OSPF_TYPE_LS_REQ 3 /* Link State Request */
47 #define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */
48 #define OSPF_TYPE_LS_ACK 5 /* Link State Ack */
49
50 /* Options *_options */
51 #define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */
52 #define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */
53 #define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */
54 #define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */
55 #define OSPF6_OPTION_R 0x10 /* R bit: Router bit */
56 #define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */
57 /* The field is actually 24-bit (RFC5340 Section A.2). */
58 #define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */
59 #define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */
60 #define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */
61
62
63 /* db_flags */
64 #define OSPF6_DB_INIT 0x04 /* */
65 #define OSPF6_DB_MORE 0x02
66 #define OSPF6_DB_MASTER 0x01
67 #define OSPF6_DB_M6 0x10 /* IPv6 MTU */
68
69 /* ls_type */
70 #define LS_TYPE_ROUTER 1 /* router link */
71 #define LS_TYPE_NETWORK 2 /* network link */
72 #define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */
73 #define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */
74 #define LS_TYPE_ASE 5 /* ASE */
75 #define LS_TYPE_GROUP 6 /* Group membership */
76 #define LS_TYPE_NSSA 7 /* NSSA */
77 #define LS_TYPE_LINK 8 /* Link LSA */
78 #define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */
79 #define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */
80 #define LS_TYPE_GRACE 11 /* Grace LSA */
81 #define LS_TYPE_RI 12 /* Router information */
82 #define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */
83 #define LS_TYPE_L1VPN 14 /* L1VPN */
84 #define LS_TYPE_MASK 0x1fff
85
86 #define LS_SCOPE_LINKLOCAL 0x0000
87 #define LS_SCOPE_AREA 0x2000
88 #define LS_SCOPE_AS 0x4000
89 #define LS_SCOPE_MASK 0x6000
90 #define LS_SCOPE_U 0x8000
91
92 /* rla_link.link_type */
93 #define RLA_TYPE_ROUTER 1 /* point-to-point to another router */
94 #define RLA_TYPE_TRANSIT 2 /* connection to transit network */
95 #define RLA_TYPE_VIRTUAL 4 /* virtual link */
96
97 /* rla_flags */
98 #define RLA_FLAG_B 0x01
99 #define RLA_FLAG_E 0x02
100 #define RLA_FLAG_V 0x04
101 #define RLA_FLAG_W 0x08
102 #define RLA_FLAG_N 0x10
103
104 /* lsa_prefix options */
105 #define LSA_PREFIX_OPT_NU 0x01
106 #define LSA_PREFIX_OPT_LA 0x02
107 #define LSA_PREFIX_OPT_MC 0x04
108 #define LSA_PREFIX_OPT_P 0x08
109 #define LSA_PREFIX_OPT_DN 0x10
110
111 /* sla_tosmetric breakdown */
112 #define SLA_MASK_TOS 0x7f000000
113 #define SLA_MASK_METRIC 0x00ffffff
114 #define SLA_SHIFT_TOS 24
115
116 /* asla_metric */
117 #define ASLA_FLAG_FWDADDR 0x02000000
118 #define ASLA_FLAG_ROUTETAG 0x01000000
119 #define ASLA_MASK_METRIC 0x00ffffff
120
121 /* RFC6506 Section 4.1 */
122 #define OSPF6_AT_HDRLEN 16U
123 #define OSPF6_AUTH_TYPE_HMAC 0x0001
124
125 typedef uint32_t rtrid_t;
126
127 /* link state advertisement header */
128 struct lsa6_hdr {
129 uint16_t ls_age;
130 uint16_t ls_type;
131 rtrid_t ls_stateid;
132 rtrid_t ls_router;
133 uint32_t ls_seq;
134 uint16_t ls_chksum;
135 uint16_t ls_length;
136 };
137
138 /* Length of an IPv6 address, in bytes. */
139 #define IPV6_ADDR_LEN_BYTES (128/8)
140
141 struct lsa6_prefix {
142 uint8_t lsa_p_len;
143 uint8_t lsa_p_opt;
144 uint16_t lsa_p_metric;
145 uint8_t lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */
146 };
147
148 /* link state advertisement */
149 struct lsa6 {
150 struct lsa6_hdr ls_hdr;
151
152 /* Link state types */
153 union {
154 /* Router links advertisements */
155 struct {
156 union {
157 uint8_t flg;
158 uint32_t opt;
159 } rla_flgandopt;
160 #define rla_flags rla_flgandopt.flg
161 #define rla_options rla_flgandopt.opt
162 struct rlalink6 {
163 uint8_t link_type;
164 uint8_t link_zero[1];
165 uint16_t link_metric;
166 uint32_t link_ifid;
167 uint32_t link_nifid;
168 rtrid_t link_nrtid;
169 } rla_link[1]; /* may repeat */
170 } un_rla;
171
172 /* Network links advertisements */
173 struct {
174 uint32_t nla_options;
175 rtrid_t nla_router[1]; /* may repeat */
176 } un_nla;
177
178 /* Inter Area Prefix LSA */
179 struct {
180 uint32_t inter_ap_metric;
181 struct lsa6_prefix inter_ap_prefix[1];
182 } un_inter_ap;
183
184 /* AS external links advertisements */
185 struct {
186 uint32_t asla_metric;
187 struct lsa6_prefix asla_prefix[1];
188 /* some optional fields follow */
189 } un_asla;
190
191 #if 0
192 /* Summary links advertisements */
193 struct {
194 struct in_addr sla_mask;
195 uint32_t sla_tosmetric[1]; /* may repeat */
196 } un_sla;
197
198 /* Multicast group membership */
199 struct mcla {
200 uint32_t mcla_vtype;
201 struct in_addr mcla_vid;
202 } un_mcla[1];
203 #endif
204
205 /* Type 7 LSA */
206
207 /* Link LSA */
208 struct llsa {
209 union {
210 uint8_t pri;
211 uint32_t opt;
212 } llsa_priandopt;
213 #define llsa_priority llsa_priandopt.pri
214 #define llsa_options llsa_priandopt.opt
215 struct in6_addr llsa_lladdr;
216 uint32_t llsa_nprefix;
217 struct lsa6_prefix llsa_prefix[1];
218 } un_llsa;
219
220 /* Intra-Area-Prefix */
221 struct {
222 uint16_t intra_ap_nprefix;
223 uint16_t intra_ap_lstype;
224 rtrid_t intra_ap_lsid;
225 rtrid_t intra_ap_rtid;
226 struct lsa6_prefix intra_ap_prefix[1];
227 } un_intra_ap;
228 } lsa_un;
229 };
230
231 /*
232 * the main header
233 */
234 struct ospf6hdr {
235 uint8_t ospf6_version;
236 uint8_t ospf6_type;
237 uint16_t ospf6_len;
238 rtrid_t ospf6_routerid;
239 rtrid_t ospf6_areaid;
240 uint16_t ospf6_chksum;
241 uint8_t ospf6_instanceid;
242 uint8_t ospf6_rsvd;
243 };
244
245 /*
246 * The OSPF6 header length is 16 bytes, regardless of how your compiler
247 * might choose to pad the above structure.
248 */
249 #define OSPF6HDR_LEN 16
250
251 /* Hello packet */
252 struct hello6 {
253 uint32_t hello_ifid;
254 union {
255 uint8_t pri;
256 uint32_t opt;
257 } hello_priandopt;
258 #define hello_priority hello_priandopt.pri
259 #define hello_options hello_priandopt.opt
260 uint16_t hello_helloint;
261 uint16_t hello_deadint;
262 rtrid_t hello_dr;
263 rtrid_t hello_bdr;
264 rtrid_t hello_neighbor[1]; /* may repeat */
265 };
266
267 /* Database Description packet */
268 struct dd6 {
269 uint32_t db_options;
270 uint16_t db_mtu;
271 uint8_t db_mbz;
272 uint8_t db_flags;
273 uint32_t db_seq;
274 struct lsa6_hdr db_lshdr[1]; /* may repeat */
275 };
276
277 /* Link State Request */
278 struct lsr6 {
279 uint16_t ls_mbz;
280 uint16_t ls_type;
281 rtrid_t ls_stateid;
282 rtrid_t ls_router;
283 };
284
285 /* Link State Update */
286 struct lsu6 {
287 uint32_t lsu_count;
288 struct lsa6 lsu_lsa[1]; /* may repeat */
289 };
290
291 static const char tstr[] = " [|ospf3]";
292
293 static const struct tok ospf6_option_values[] = {
294 { OSPF6_OPTION_V6, "V6" },
295 { OSPF6_OPTION_E, "External" },
296 { OSPF6_OPTION_MC, "Deprecated" },
297 { OSPF6_OPTION_N, "NSSA" },
298 { OSPF6_OPTION_R, "Router" },
299 { OSPF6_OPTION_DC, "Demand Circuit" },
300 { OSPF6_OPTION_AF, "AFs Support" },
301 { OSPF6_OPTION_L, "LLS" },
302 { OSPF6_OPTION_AT, "Authentication Trailer" },
303 { 0, NULL }
304 };
305
306 static const struct tok ospf6_rla_flag_values[] = {
307 { RLA_FLAG_B, "ABR" },
308 { RLA_FLAG_E, "External" },
309 { RLA_FLAG_V, "Virtual-Link Endpoint" },
310 { RLA_FLAG_W, "Wildcard Receiver" },
311 { RLA_FLAG_N, "NSSA Translator" },
312 { 0, NULL }
313 };
314
315 static const struct tok ospf6_asla_flag_values[] = {
316 { ASLA_FLAG_EXTERNAL, "External Type 2" },
317 { ASLA_FLAG_FWDADDR, "Forwarding" },
318 { ASLA_FLAG_ROUTETAG, "Tag" },
319 { 0, NULL }
320 };
321
322 static const struct tok ospf6_type_values[] = {
323 { OSPF_TYPE_HELLO, "Hello" },
324 { OSPF_TYPE_DD, "Database Description" },
325 { OSPF_TYPE_LS_REQ, "LS-Request" },
326 { OSPF_TYPE_LS_UPDATE, "LS-Update" },
327 { OSPF_TYPE_LS_ACK, "LS-Ack" },
328 { 0, NULL }
329 };
330
331 static const struct tok ospf6_lsa_values[] = {
332 { LS_TYPE_ROUTER, "Router" },
333 { LS_TYPE_NETWORK, "Network" },
334 { LS_TYPE_INTER_AP, "Inter-Area Prefix" },
335 { LS_TYPE_INTER_AR, "Inter-Area Router" },
336 { LS_TYPE_ASE, "External" },
337 { LS_TYPE_GROUP, "Deprecated" },
338 { LS_TYPE_NSSA, "NSSA" },
339 { LS_TYPE_LINK, "Link" },
340 { LS_TYPE_INTRA_AP, "Intra-Area Prefix" },
341 { LS_TYPE_INTRA_ATE, "Intra-Area TE" },
342 { LS_TYPE_GRACE, "Grace" },
343 { LS_TYPE_RI, "Router Information" },
344 { LS_TYPE_INTER_ASTE, "Inter-AS-TE" },
345 { LS_TYPE_L1VPN, "Layer 1 VPN" },
346 { 0, NULL }
347 };
348
349 static const struct tok ospf6_ls_scope_values[] = {
350 { LS_SCOPE_LINKLOCAL, "Link Local" },
351 { LS_SCOPE_AREA, "Area Local" },
352 { LS_SCOPE_AS, "Domain Wide" },
353 { 0, NULL }
354 };
355
356 static const struct tok ospf6_dd_flag_values[] = {
357 { OSPF6_DB_INIT, "Init" },
358 { OSPF6_DB_MORE, "More" },
359 { OSPF6_DB_MASTER, "Master" },
360 { OSPF6_DB_M6, "IPv6 MTU" },
361 { 0, NULL }
362 };
363
364 static const struct tok ospf6_lsa_prefix_option_values[] = {
365 { LSA_PREFIX_OPT_NU, "No Unicast" },
366 { LSA_PREFIX_OPT_LA, "Local address" },
367 { LSA_PREFIX_OPT_MC, "Deprecated" },
368 { LSA_PREFIX_OPT_P, "Propagate" },
369 { LSA_PREFIX_OPT_DN, "Down" },
370 { 0, NULL }
371 };
372
373 static const struct tok ospf6_auth_type_str[] = {
374 { OSPF6_AUTH_TYPE_HMAC, "HMAC" },
375 { 0, NULL }
376 };
377
378 static void
379 ospf6_print_ls_type(netdissect_options *ndo,
380 register u_int ls_type, register const rtrid_t *ls_stateid)
381 {
382 ND_PRINT((ndo, "\n\t %s LSA (%d), %s Scope%s, LSA-ID %s",
383 tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK),
384 ls_type & LS_TYPE_MASK,
385 tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK),
386 ls_type &0x8000 ? ", transitive" : "", /* U-bit */
387 ipaddr_string(ndo, ls_stateid)));
388 }
389
390 static int
391 ospf6_print_lshdr(netdissect_options *ndo,
392 register const struct lsa6_hdr *lshp, const u_char *dataend)
393 {
394 if ((u_char *)(lshp + 1) > dataend)
395 goto trunc;
396 ND_TCHECK(lshp->ls_type);
397 ND_TCHECK(lshp->ls_seq);
398
399 ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
400 ipaddr_string(ndo, &lshp->ls_router),
401 EXTRACT_32BITS(&lshp->ls_seq),
402 EXTRACT_16BITS(&lshp->ls_age),
403 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr)));
404
405 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid);
406
407 return (0);
408 trunc:
409 return (1);
410 }
411
412 static int
413 ospf6_print_lsaprefix(netdissect_options *ndo,
414 const uint8_t *tptr, u_int lsa_length)
415 {
416 const struct lsa6_prefix *lsapp = (struct lsa6_prefix *)tptr;
417 u_int wordlen;
418 struct in6_addr prefix;
419
420 if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES)
421 goto trunc;
422 lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES;
423 ND_TCHECK2(*lsapp, sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES);
424 wordlen = (lsapp->lsa_p_len + 31) / 32;
425 if (wordlen * 4 > sizeof(struct in6_addr)) {
426 ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len));
427 goto trunc;
428 }
429 if (lsa_length < wordlen * 4)
430 goto trunc;
431 lsa_length -= wordlen * 4;
432 ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4);
433 memset(&prefix, 0, sizeof(prefix));
434 memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4);
435 ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix),
436 lsapp->lsa_p_len));
437 if (lsapp->lsa_p_opt) {
438 ND_PRINT((ndo, ", Options [%s]",
439 bittok2str(ospf6_lsa_prefix_option_values,
440 "none", lsapp->lsa_p_opt)));
441 }
442 ND_PRINT((ndo, ", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric)));
443 return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4;
444
445 trunc:
446 return -1;
447 }
448
449
450 /*
451 * Print a single link state advertisement. If truncated return 1, else 0.
452 */
453 static int
454 ospf6_print_lsa(netdissect_options *ndo,
455 register const struct lsa6 *lsap, const u_char *dataend)
456 {
457 register const struct rlalink6 *rlp;
458 #if 0
459 register const struct tos_metric *tosp;
460 #endif
461 register const rtrid_t *ap;
462 #if 0
463 register const struct aslametric *almp;
464 register const struct mcla *mcp;
465 #endif
466 register const struct llsa *llsap;
467 register const struct lsa6_prefix *lsapp;
468 #if 0
469 register const uint32_t *lp;
470 #endif
471 register u_int prefixes;
472 register int bytelen;
473 register u_int length, lsa_length;
474 uint32_t flags32;
475 const uint8_t *tptr;
476
477 if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend))
478 return (1);
479 ND_TCHECK(lsap->ls_hdr.ls_length);
480 length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length);
481
482 /*
483 * The LSA length includes the length of the header;
484 * it must have a value that's at least that length.
485 * If it does, find the length of what follows the
486 * header.
487 */
488 if (length < sizeof(struct lsa6_hdr) || (u_char *)lsap + length > dataend)
489 return (1);
490 lsa_length = length - sizeof(struct lsa6_hdr);
491 tptr = (uint8_t *)lsap+sizeof(struct lsa6_hdr);
492
493 switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) {
494 case LS_TYPE_ROUTER | LS_SCOPE_AREA:
495 if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options))
496 return (1);
497 lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options);
498 ND_TCHECK(lsap->lsa_un.un_rla.rla_options);
499 ND_PRINT((ndo, "\n\t Options [%s]",
500 bittok2str(ospf6_option_values, "none",
501 EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options))));
502 ND_PRINT((ndo, ", RLA-Flags [%s]",
503 bittok2str(ospf6_rla_flag_values, "none",
504 lsap->lsa_un.un_rla.rla_flags)));
505
506 rlp = lsap->lsa_un.un_rla.rla_link;
507 while (lsa_length != 0) {
508 if (lsa_length < sizeof (*rlp))
509 return (1);
510 lsa_length -= sizeof (*rlp);
511 ND_TCHECK(*rlp);
512 switch (rlp->link_type) {
513
514 case RLA_TYPE_VIRTUAL:
515 ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID %s"
516 "\n\t Neighbor Interface-ID %s, Interface %s",
517 ipaddr_string(ndo, &rlp->link_nrtid),
518 ipaddr_string(ndo, &rlp->link_nifid),
519 ipaddr_string(ndo, &rlp->link_ifid)));
520 break;
521
522 case RLA_TYPE_ROUTER:
523 ND_PRINT((ndo, "\n\t Neighbor Router-ID %s"
524 "\n\t Neighbor Interface-ID %s, Interface %s",
525 ipaddr_string(ndo, &rlp->link_nrtid),
526 ipaddr_string(ndo, &rlp->link_nifid),
527 ipaddr_string(ndo, &rlp->link_ifid)));
528 break;
529
530 case RLA_TYPE_TRANSIT:
531 ND_PRINT((ndo, "\n\t Neighbor Network-ID %s"
532 "\n\t Neighbor Interface-ID %s, Interface %s",
533 ipaddr_string(ndo, &rlp->link_nrtid),
534 ipaddr_string(ndo, &rlp->link_nifid),
535 ipaddr_string(ndo, &rlp->link_ifid)));
536 break;
537
538 default:
539 ND_PRINT((ndo, "\n\t Unknown Router Links Type 0x%02x",
540 rlp->link_type));
541 return (0);
542 }
543 ND_PRINT((ndo, ", metric %d", EXTRACT_16BITS(&rlp->link_metric)));
544 rlp++;
545 }
546 break;
547
548 case LS_TYPE_NETWORK | LS_SCOPE_AREA:
549 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options))
550 return (1);
551 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options);
552 ND_TCHECK(lsap->lsa_un.un_nla.nla_options);
553 ND_PRINT((ndo, "\n\t Options [%s]",
554 bittok2str(ospf6_option_values, "none",
555 EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options))));
556
557 ND_PRINT((ndo, "\n\t Connected Routers:"));
558 ap = lsap->lsa_un.un_nla.nla_router;
559 while (lsa_length != 0) {
560 if (lsa_length < sizeof (*ap))
561 return (1);
562 lsa_length -= sizeof (*ap);
563 ND_TCHECK(*ap);
564 ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, ap)));
565 ++ap;
566 }
567 break;
568
569 case LS_TYPE_INTER_AP | LS_SCOPE_AREA:
570 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric))
571 return (1);
572 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric);
573 ND_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric);
574 ND_PRINT((ndo, ", metric %u",
575 EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC));
576
577 tptr = (uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix;
578 while (lsa_length != 0) {
579 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
580 if (bytelen < 0)
581 goto trunc;
582 lsa_length -= bytelen;
583 tptr += bytelen;
584 }
585 break;
586
587 case LS_TYPE_ASE | LS_SCOPE_AS:
588 if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric))
589 return (1);
590 lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric);
591 ND_TCHECK(lsap->lsa_un.un_asla.asla_metric);
592 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric);
593 ND_PRINT((ndo, "\n\t Flags [%s]",
594 bittok2str(ospf6_asla_flag_values, "none", flags32)));
595 ND_PRINT((ndo, " metric %u",
596 EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) &
597 ASLA_MASK_METRIC));
598
599 tptr = (uint8_t *)lsap->lsa_un.un_asla.asla_prefix;
600 lsapp = (struct lsa6_prefix *)tptr;
601 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
602 if (bytelen < 0)
603 goto trunc;
604 lsa_length -= bytelen;
605 tptr += bytelen;
606
607 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
608 struct in6_addr *fwdaddr6;
609
610 fwdaddr6 = (struct in6_addr *)tptr;
611 if (lsa_length < sizeof (*fwdaddr6))
612 return (1);
613 lsa_length -= sizeof (*fwdaddr6);
614 ND_TCHECK(*fwdaddr6);
615 ND_PRINT((ndo, " forward %s",
616 ip6addr_string(ndo, fwdaddr6)));
617 tptr += sizeof(*fwdaddr6);
618 }
619
620 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
621 if (lsa_length < sizeof (uint32_t))
622 return (1);
623 lsa_length -= sizeof (uint32_t);
624 ND_TCHECK(*(uint32_t *)tptr);
625 ND_PRINT((ndo, " tag %s",
626 ipaddr_string(ndo, (uint32_t *)tptr)));
627 tptr += sizeof(uint32_t);
628 }
629
630 if (lsapp->lsa_p_metric) {
631 if (lsa_length < sizeof (uint32_t))
632 return (1);
633 lsa_length -= sizeof (uint32_t);
634 ND_TCHECK(*(uint32_t *)tptr);
635 ND_PRINT((ndo, " RefLSID: %s",
636 ipaddr_string(ndo, (uint32_t *)tptr)));
637 tptr += sizeof(uint32_t);
638 }
639 break;
640
641 case LS_TYPE_LINK:
642 /* Link LSA */
643 llsap = &lsap->lsa_un.un_llsa;
644 if (lsa_length < sizeof (llsap->llsa_priandopt))
645 return (1);
646 lsa_length -= sizeof (llsap->llsa_priandopt);
647 ND_TCHECK(llsap->llsa_priandopt);
648 ND_PRINT((ndo, "\n\t Options [%s]",
649 bittok2str(ospf6_option_values, "none",
650 EXTRACT_32BITS(&llsap->llsa_options))));
651
652 if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix))
653 return (1);
654 lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix);
655 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix);
656 ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:",
657 llsap->llsa_priority,
658 ip6addr_string(ndo, &llsap->llsa_lladdr),
659 prefixes));
660
661 tptr = (uint8_t *)llsap->llsa_prefix;
662 while (prefixes > 0) {
663 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
664 if (bytelen < 0)
665 goto trunc;
666 prefixes--;
667 lsa_length -= bytelen;
668 tptr += bytelen;
669 }
670 break;
671
672 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA:
673 /* Intra-Area-Prefix LSA */
674 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid))
675 return (1);
676 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid);
677 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
678 ospf6_print_ls_type(ndo,
679 EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype),
680 &lsap->lsa_un.un_intra_ap.intra_ap_lsid);
681
682 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix))
683 return (1);
684 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
685 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
686 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
687 ND_PRINT((ndo, "\n\t Prefixes %d:", prefixes));
688
689 tptr = (uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
690 while (prefixes > 0) {
691 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
692 if (bytelen < 0)
693 goto trunc;
694 prefixes--;
695 lsa_length -= bytelen;
696 tptr += bytelen;
697 }
698 break;
699
700 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
701 if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) {
702 return 1;
703 }
704 break;
705
706 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
707 if (ospf_print_te_lsa(ndo, tptr, lsa_length) == -1) {
708 return 1;
709 }
710 break;
711
712 default:
713 if(!print_unknown_data(ndo,tptr,
714 "\n\t ",
715 lsa_length)) {
716 return (1);
717 }
718 break;
719 }
720
721 return (0);
722 trunc:
723 return (1);
724 }
725
726 static int
727 ospf6_decode_v3(netdissect_options *ndo,
728 register const struct ospf6hdr *op,
729 register const u_char *dataend)
730 {
731 register const rtrid_t *ap;
732 register const struct lsr6 *lsrp;
733 register const struct lsa6_hdr *lshp;
734 register const struct lsa6 *lsap;
735 register int i;
736
737 switch (op->ospf6_type) {
738
739 case OSPF_TYPE_HELLO: {
740 register const struct hello6 *hellop = (const struct hello6 *)((uint8_t *)op + OSPF6HDR_LEN);
741
742 ND_PRINT((ndo, "\n\tOptions [%s]",
743 bittok2str(ospf6_option_values, "none",
744 EXTRACT_32BITS(&hellop->hello_options))));
745
746 ND_TCHECK(hellop->hello_deadint);
747 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
748 EXTRACT_16BITS(&hellop->hello_helloint),
749 EXTRACT_16BITS(&hellop->hello_deadint),
750 ipaddr_string(ndo, &hellop->hello_ifid),
751 hellop->hello_priority));
752
753 ND_TCHECK(hellop->hello_dr);
754 if (EXTRACT_32BITS(&hellop->hello_dr) != 0)
755 ND_PRINT((ndo, "\n\t Designated Router %s",
756 ipaddr_string(ndo, &hellop->hello_dr)));
757 ND_TCHECK(hellop->hello_bdr);
758 if (EXTRACT_32BITS(&hellop->hello_bdr) != 0)
759 ND_PRINT((ndo, ", Backup Designated Router %s",
760 ipaddr_string(ndo, &hellop->hello_bdr)));
761 if (ndo->ndo_vflag > 1) {
762 ND_PRINT((ndo, "\n\t Neighbor List:"));
763 ap = hellop->hello_neighbor;
764 while ((u_char *)ap < dataend) {
765 ND_TCHECK(*ap);
766 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap)));
767 ++ap;
768 }
769 }
770 break; /* HELLO */
771 }
772
773 case OSPF_TYPE_DD: {
774 register const struct dd6 *ddp = (const struct dd6 *)((uint8_t *)op + OSPF6HDR_LEN);
775
776 ND_TCHECK(ddp->db_options);
777 ND_PRINT((ndo, "\n\tOptions [%s]",
778 bittok2str(ospf6_option_values, "none",
779 EXTRACT_32BITS(&ddp->db_options))));
780 ND_TCHECK(ddp->db_flags);
781 ND_PRINT((ndo, ", DD Flags [%s]",
782 bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags)));
783
784 ND_TCHECK(ddp->db_seq);
785 ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x",
786 EXTRACT_16BITS(&ddp->db_mtu),
787 EXTRACT_32BITS(&ddp->db_seq)));
788 if (ndo->ndo_vflag > 1) {
789 /* Print all the LS adv's */
790 lshp = ddp->db_lshdr;
791 while ((u_char *)lshp < dataend) {
792 if (ospf6_print_lshdr(ndo, lshp++, dataend))
793 goto trunc;
794 }
795 }
796 break;
797 }
798
799 case OSPF_TYPE_LS_REQ:
800 if (ndo->ndo_vflag > 1) {
801 lsrp = (const struct lsr6 *)((uint8_t *)op + OSPF6HDR_LEN);
802 while ((u_char *)lsrp < dataend) {
803 ND_TCHECK(*lsrp);
804 ND_PRINT((ndo, "\n\t Advertising Router %s",
805 ipaddr_string(ndo, &lsrp->ls_router)));
806 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type),
807 &lsrp->ls_stateid);
808 ++lsrp;
809 }
810 }
811 break;
812
813 case OSPF_TYPE_LS_UPDATE:
814 if (ndo->ndo_vflag > 1) {
815 register const struct lsu6 *lsup = (const struct lsu6 *)((uint8_t *)op + OSPF6HDR_LEN);
816
817 ND_TCHECK(lsup->lsu_count);
818 i = EXTRACT_32BITS(&lsup->lsu_count);
819 lsap = lsup->lsu_lsa;
820 while ((u_char *)lsap < dataend && i--) {
821 if (ospf6_print_lsa(ndo, lsap, dataend))
822 goto trunc;
823 lsap = (struct lsa6 *)((u_char *)lsap +
824 EXTRACT_16BITS(&lsap->ls_hdr.ls_length));
825 }
826 }
827 break;
828
829 case OSPF_TYPE_LS_ACK:
830 if (ndo->ndo_vflag > 1) {
831 lshp = (const struct lsa6_hdr *)((uint8_t *)op + OSPF6HDR_LEN);
832 while ((u_char *)lshp < dataend) {
833 if (ospf6_print_lshdr(ndo, lshp++, dataend))
834 goto trunc;
835 }
836 }
837 break;
838
839 default:
840 break;
841 }
842 return (0);
843 trunc:
844 return (1);
845 }
846
847 /* RFC5613 Section 2.2 (w/o the TLVs) */
848 static int
849 ospf6_print_lls(netdissect_options *ndo,
850 const u_char *cp, const u_int len)
851 {
852 uint16_t llsdatalen;
853
854 if (len == 0)
855 return 0;
856 if (len < OSPF_LLS_HDRLEN)
857 goto trunc;
858 /* Checksum */
859 ND_TCHECK2(*cp, 2);
860 ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp)));
861 cp += 2;
862 /* LLS Data Length */
863 ND_TCHECK2(*cp, 2);
864 llsdatalen = EXTRACT_16BITS(cp);
865 ND_PRINT((ndo, ", Data Length %u", llsdatalen));
866 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
867 goto trunc;
868 cp += 2;
869 /* LLS TLVs */
870 ND_TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN);
871 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */
872
873 return llsdatalen;
874 trunc:
875 return -1;
876 }
877
878 /* RFC6506 Section 4.1 */
879 static int
880 ospf6_decode_at(netdissect_options *ndo,
881 const u_char *cp, const u_int len)
882 {
883 uint16_t authdatalen;
884
885 if (len == 0)
886 return 0;
887 if (len < OSPF6_AT_HDRLEN)
888 goto trunc;
889 /* Authentication Type */
890 ND_TCHECK2(*cp, 2);
891 ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp))));
892 cp += 2;
893 /* Auth Data Len */
894 ND_TCHECK2(*cp, 2);
895 authdatalen = EXTRACT_16BITS(cp);
896 ND_PRINT((ndo, ", Length %u", authdatalen));
897 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
898 goto trunc;
899 cp += 2;
900 /* Reserved */
901 ND_TCHECK2(*cp, 2);
902 cp += 2;
903 /* Security Association ID */
904 ND_TCHECK2(*cp, 2);
905 ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp)));
906 cp += 2;
907 /* Cryptographic Sequence Number (High-Order 32 Bits) */
908 ND_TCHECK2(*cp, 4);
909 ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp)));
910 cp += 4;
911 /* Cryptographic Sequence Number (Low-Order 32 Bits) */
912 ND_TCHECK2(*cp, 4);
913 ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp)));
914 cp += 4;
915 /* Authentication Data */
916 ND_TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN);
917 if (ndo->ndo_vflag > 1)
918 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN);
919 return 0;
920
921 trunc:
922 return 1;
923 }
924
925 /* The trailing data may include LLS and/or AT data (in this specific order).
926 * LLS data may be present only in Hello and DBDesc packets with the L-bit set.
927 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in
928 * any other packet type, thus decode the AT data regardless of the AT-bit.
929 */
930 static int
931 ospf6_decode_v3_trailer(netdissect_options *ndo,
932 const struct ospf6hdr *op, const u_char *cp, const unsigned len)
933 {
934 int llslen = 0;
935 int lls_hello = 0;
936 int lls_dd = 0;
937
938 if (op->ospf6_type == OSPF_TYPE_HELLO) {
939 const struct hello6 *hellop = (const struct hello6 *)((uint8_t *)op + OSPF6HDR_LEN);
940 if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L)
941 lls_hello = 1;
942 } else if (op->ospf6_type == OSPF_TYPE_DD) {
943 const struct dd6 *ddp = (const struct dd6 *)((uint8_t *)op + OSPF6HDR_LEN);
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
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 = (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 }
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