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Include <string.h> only if required.
[tcpdump] / print-ospf6.c
1 /*
2 * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
22 */
23
24 /* \summary: IPv6 Open Shortest Path First (OSPFv3) printer */
25
26 #ifdef HAVE_CONFIG_H
27 #include <config.h>
28 #endif
29
30 #include "netdissect-stdinc.h"
31
32 #include <string.h>
33
34 #include "netdissect.h"
35 #include "addrtoname.h"
36 #include "extract.h"
37
38 #include "ospf.h"
39
40 #define OSPF_TYPE_HELLO 1 /* Hello */
41 #define OSPF_TYPE_DD 2 /* Database Description */
42 #define OSPF_TYPE_LS_REQ 3 /* Link State Request */
43 #define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */
44 #define OSPF_TYPE_LS_ACK 5 /* Link State Ack */
45
46 /* Options *_options */
47 #define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */
48 #define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */
49 #define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */
50 #define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */
51 #define OSPF6_OPTION_R 0x10 /* R bit: Router bit */
52 #define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */
53 /* The field is actually 24-bit (RFC5340 Section A.2). */
54 #define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */
55 #define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */
56 #define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */
57
58
59 /* db_flags */
60 #define OSPF6_DB_INIT 0x04 /* */
61 #define OSPF6_DB_MORE 0x02
62 #define OSPF6_DB_MASTER 0x01
63 #define OSPF6_DB_M6 0x10 /* IPv6 MTU */
64
65 /* ls_type */
66 #define LS_TYPE_ROUTER 1 /* router link */
67 #define LS_TYPE_NETWORK 2 /* network link */
68 #define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */
69 #define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */
70 #define LS_TYPE_ASE 5 /* ASE */
71 #define LS_TYPE_GROUP 6 /* Group membership */
72 #define LS_TYPE_NSSA 7 /* NSSA */
73 #define LS_TYPE_LINK 8 /* Link LSA */
74 #define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */
75 #define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */
76 #define LS_TYPE_GRACE 11 /* Grace LSA */
77 #define LS_TYPE_RI 12 /* Router information */
78 #define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */
79 #define LS_TYPE_L1VPN 14 /* L1VPN */
80 #define LS_TYPE_MASK 0x1fff
81
82 #define LS_SCOPE_LINKLOCAL 0x0000
83 #define LS_SCOPE_AREA 0x2000
84 #define LS_SCOPE_AS 0x4000
85 #define LS_SCOPE_MASK 0x6000
86 #define LS_SCOPE_U 0x8000
87
88 /* rla_link.link_type */
89 #define RLA_TYPE_ROUTER 1 /* point-to-point to another router */
90 #define RLA_TYPE_TRANSIT 2 /* connection to transit network */
91 #define RLA_TYPE_VIRTUAL 4 /* virtual link */
92
93 /* rla_flags */
94 #define RLA_FLAG_B 0x01
95 #define RLA_FLAG_E 0x02
96 #define RLA_FLAG_V 0x04
97 #define RLA_FLAG_W 0x08
98 #define RLA_FLAG_Nt 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 #define LSA_PREFIX_OPT_N 0x20
107
108 /* sla_tosmetric breakdown */
109 #define SLA_MASK_TOS 0x7f000000
110 #define SLA_MASK_METRIC 0x00ffffff
111 #define SLA_SHIFT_TOS 24
112
113 /* asla_metric */
114 #define ASLA_FLAG_FWDADDR 0x02000000
115 #define ASLA_FLAG_ROUTETAG 0x01000000
116 #define ASLA_MASK_METRIC 0x00ffffff
117
118 /* RFC6506 Section 4.1 */
119 #define OSPF6_AT_HDRLEN 16U
120 #define OSPF6_AUTH_TYPE_HMAC 0x0001
121
122 typedef nd_uint32_t rtrid_t;
123
124 /* link state advertisement header */
125 struct lsa6_hdr {
126 nd_uint16_t ls_age;
127 nd_uint16_t ls_type;
128 rtrid_t ls_stateid;
129 rtrid_t ls_router;
130 nd_uint32_t ls_seq;
131 nd_uint16_t ls_chksum;
132 nd_uint16_t ls_length;
133 };
134
135 /* Length of an IPv6 address, in bytes. */
136 #define IPV6_ADDR_LEN_BYTES (128/8)
137
138 struct lsa6_prefix {
139 nd_uint8_t lsa_p_len;
140 nd_uint8_t lsa_p_opt;
141 nd_uint16_t lsa_p_metric;
142 nd_byte lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */
143 };
144
145 /* link state advertisement */
146 struct lsa6 {
147 struct lsa6_hdr ls_hdr;
148
149 /* Link state types */
150 union {
151 /* Router links advertisements */
152 struct {
153 union {
154 nd_uint8_t flg;
155 nd_uint32_t opt;
156 } rla_flgandopt;
157 #define rla_flags rla_flgandopt.flg
158 #define rla_options rla_flgandopt.opt
159 struct rlalink6 {
160 nd_uint8_t link_type;
161 nd_byte link_zero;
162 nd_uint16_t link_metric;
163 nd_uint32_t link_ifid;
164 nd_uint32_t link_nifid;
165 rtrid_t link_nrtid;
166 } rla_link[1]; /* may repeat */
167 } un_rla;
168
169 /* Network links advertisements */
170 struct {
171 nd_uint32_t nla_options;
172 rtrid_t nla_router[1]; /* may repeat */
173 } un_nla;
174
175 /* Inter Area Prefix LSA */
176 struct {
177 nd_uint32_t inter_ap_metric;
178 struct lsa6_prefix inter_ap_prefix[1];
179 } un_inter_ap;
180
181 /* AS external links advertisements */
182 struct {
183 nd_uint32_t asla_metric;
184 struct lsa6_prefix asla_prefix[1];
185 /* some optional fields follow */
186 } un_asla;
187
188 #if 0
189 /* Summary links advertisements */
190 struct {
191 nd_ipv4 sla_mask;
192 nd_uint32_t sla_tosmetric[1]; /* may repeat */
193 } un_sla;
194
195 /* Multicast group membership */
196 struct mcla {
197 nd_uint32_t mcla_vtype;
198 nd_ipv4 mcla_vid;
199 } un_mcla[1];
200 #endif
201
202 /* Type 7 LSA */
203
204 /* Link LSA */
205 struct llsa {
206 union {
207 nd_uint8_t pri;
208 nd_uint32_t opt;
209 } llsa_priandopt;
210 #define llsa_priority llsa_priandopt.pri
211 #define llsa_options llsa_priandopt.opt
212 nd_ipv6 llsa_lladdr;
213 nd_uint32_t llsa_nprefix;
214 struct lsa6_prefix llsa_prefix[1];
215 } un_llsa;
216
217 /* Intra-Area-Prefix */
218 struct {
219 nd_uint16_t intra_ap_nprefix;
220 nd_uint16_t intra_ap_lstype;
221 rtrid_t intra_ap_lsid;
222 rtrid_t intra_ap_rtid;
223 struct lsa6_prefix intra_ap_prefix[1];
224 } un_intra_ap;
225 } lsa_un;
226 };
227
228 /*
229 * the main header
230 */
231 struct ospf6hdr {
232 nd_uint8_t ospf6_version;
233 nd_uint8_t ospf6_type;
234 nd_uint16_t ospf6_len;
235 rtrid_t ospf6_routerid;
236 rtrid_t ospf6_areaid;
237 nd_uint16_t ospf6_chksum;
238 nd_uint8_t ospf6_instanceid;
239 nd_uint8_t ospf6_rsvd;
240 };
241
242 /*
243 * The OSPF6 header length is 16 bytes, regardless of how your compiler
244 * might choose to pad the above structure.
245 */
246 #define OSPF6HDR_LEN 16
247
248 /* Hello packet */
249 struct hello6 {
250 nd_uint32_t hello_ifid;
251 union {
252 nd_uint8_t pri;
253 nd_uint32_t opt;
254 } hello_priandopt;
255 #define hello_priority hello_priandopt.pri
256 #define hello_options hello_priandopt.opt
257 nd_uint16_t hello_helloint;
258 nd_uint16_t hello_deadint;
259 rtrid_t hello_dr;
260 rtrid_t hello_bdr;
261 rtrid_t hello_neighbor[1]; /* may repeat */
262 };
263
264 /* Database Description packet */
265 struct dd6 {
266 nd_uint32_t db_options;
267 nd_uint16_t db_mtu;
268 nd_uint8_t db_mbz;
269 nd_uint8_t db_flags;
270 nd_uint32_t db_seq;
271 struct lsa6_hdr db_lshdr[1]; /* may repeat */
272 };
273
274 /* Link State Request */
275 struct lsr6 {
276 nd_uint16_t ls_mbz;
277 nd_uint16_t ls_type;
278 rtrid_t ls_stateid;
279 rtrid_t ls_router;
280 };
281
282 /* Link State Update */
283 struct lsu6 {
284 nd_uint32_t lsu_count;
285 struct lsa6 lsu_lsa[1]; /* may repeat */
286 };
287
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, "Deprecated" },
307 { RLA_FLAG_Nt, "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 { LSA_PREFIX_OPT_N, "N-bit" },
367 { 0, NULL }
368 };
369
370 static const struct tok ospf6_auth_type_str[] = {
371 { OSPF6_AUTH_TYPE_HMAC, "HMAC" },
372 { 0, NULL }
373 };
374
375 static void
376 ospf6_print_ls_type(netdissect_options *ndo,
377 u_int ls_type, const rtrid_t *ls_stateid)
378 {
379 ND_PRINT("\n\t %s LSA (%u), %s Scope%s, LSA-ID %s",
380 tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK),
381 ls_type & LS_TYPE_MASK,
382 tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK),
383 ls_type &0x8000 ? ", transitive" : "", /* U-bit */
384 GET_IPADDR_STRING((const u_char *)ls_stateid));
385 }
386
387 static int
388 ospf6_print_lshdr(netdissect_options *ndo,
389 const struct lsa6_hdr *lshp, const u_char *dataend)
390 {
391 if ((const u_char *)(lshp + 1) > dataend)
392 goto trunc;
393
394 ND_PRINT("\n\t Advertising Router %s, seq 0x%08x, age %us, length %u",
395 GET_IPADDR_STRING(lshp->ls_router),
396 GET_BE_U_4(lshp->ls_seq),
397 GET_BE_U_2(lshp->ls_age),
398 GET_BE_U_2(lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr));
399
400 ospf6_print_ls_type(ndo, GET_BE_U_2(lshp->ls_type),
401 &lshp->ls_stateid);
402
403 return (0);
404 trunc:
405 return (1);
406 }
407
408 static int
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 nd_ipv6 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_TCHECK_LEN(lsapp, sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES);
420 wordlen = (GET_U_1(lsapp->lsa_p_len) + 31) / 32;
421 if (wordlen * 4 > sizeof(nd_ipv6)) {
422 ND_PRINT(" bogus prefixlen /%u", GET_U_1(lsapp->lsa_p_len));
423 goto trunc;
424 }
425 if (lsa_length < wordlen * 4)
426 goto trunc;
427 lsa_length -= wordlen * 4;
428 ND_TCHECK_LEN(lsapp->lsa_p_prefix, wordlen * 4);
429 memset(prefix, 0, sizeof(prefix));
430 memcpy(prefix, lsapp->lsa_p_prefix, wordlen * 4);
431 ND_PRINT("\n\t\t%s/%u", ip6addr_string(ndo, prefix), /* local buffer, not packet data; don't use GET_IP6ADDR_STRING() */
432 GET_U_1(lsapp->lsa_p_len));
433 if (GET_U_1(lsapp->lsa_p_opt)) {
434 ND_PRINT(", Options [%s]",
435 bittok2str(ospf6_lsa_prefix_option_values,
436 "none", GET_U_1(lsapp->lsa_p_opt)));
437 }
438 ND_PRINT(", metric %u", GET_BE_U_2(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
450 ospf6_print_lsa(netdissect_options *ndo,
451 const struct lsa6 *lsap, const u_char *dataend)
452 {
453 const struct rlalink6 *rlp;
454 #if 0
455 const struct tos_metric *tosp;
456 #endif
457 const rtrid_t *ap;
458 #if 0
459 const struct aslametric *almp;
460 const struct mcla *mcp;
461 #endif
462 const struct llsa *llsap;
463 const struct lsa6_prefix *lsapp;
464 #if 0
465 const uint32_t *lp;
466 #endif
467 u_int prefixes;
468 int bytelen;
469 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 length = GET_BE_U_2(lsap->ls_hdr.ls_length);
476
477 /*
478 * The LSA length includes the length of the header;
479 * it must have a value that's at least that length.
480 * If it does, find the length of what follows the
481 * header.
482 */
483 if (length < sizeof(struct lsa6_hdr) || (const u_char *)lsap + length > dataend)
484 return (1);
485 lsa_length = length - sizeof(struct lsa6_hdr);
486 tptr = (const uint8_t *)lsap+sizeof(struct lsa6_hdr);
487
488 switch (GET_BE_U_2(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_PRINT("\n\t Options [%s]",
494 bittok2str(ospf6_option_values, "none",
495 GET_BE_U_4(lsap->lsa_un.un_rla.rla_options)));
496 ND_PRINT(", RLA-Flags [%s]",
497 bittok2str(ospf6_rla_flag_values, "none",
498 GET_U_1(lsap->lsa_un.un_rla.rla_flags)));
499
500 rlp = lsap->lsa_un.un_rla.rla_link;
501 while (lsa_length != 0) {
502 if (lsa_length < sizeof (*rlp))
503 return (1);
504 lsa_length -= sizeof (*rlp);
505 ND_TCHECK_SIZE(rlp);
506 switch (GET_U_1(rlp->link_type)) {
507
508 case RLA_TYPE_VIRTUAL:
509 ND_PRINT("\n\t Virtual Link: Neighbor Router-ID %s"
510 "\n\t Neighbor Interface-ID %s, Interface %s",
511 GET_IPADDR_STRING(rlp->link_nrtid),
512 GET_IPADDR_STRING(rlp->link_nifid),
513 GET_IPADDR_STRING(rlp->link_ifid));
514 break;
515
516 case RLA_TYPE_ROUTER:
517 ND_PRINT("\n\t Neighbor Router-ID %s"
518 "\n\t Neighbor Interface-ID %s, Interface %s",
519 GET_IPADDR_STRING(rlp->link_nrtid),
520 GET_IPADDR_STRING(rlp->link_nifid),
521 GET_IPADDR_STRING(rlp->link_ifid));
522 break;
523
524 case RLA_TYPE_TRANSIT:
525 ND_PRINT("\n\t Neighbor Network-ID %s"
526 "\n\t Neighbor Interface-ID %s, Interface %s",
527 GET_IPADDR_STRING(rlp->link_nrtid),
528 GET_IPADDR_STRING(rlp->link_nifid),
529 GET_IPADDR_STRING(rlp->link_ifid));
530 break;
531
532 default:
533 ND_PRINT("\n\t Unknown Router Links Type 0x%02x",
534 GET_U_1(rlp->link_type));
535 return (0);
536 }
537 ND_PRINT(", metric %u", GET_BE_U_2(rlp->link_metric));
538 rlp++;
539 }
540 break;
541
542 case LS_TYPE_NETWORK | LS_SCOPE_AREA:
543 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options))
544 return (1);
545 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options);
546 ND_PRINT("\n\t Options [%s]",
547 bittok2str(ospf6_option_values, "none",
548 GET_BE_U_4(lsap->lsa_un.un_nla.nla_options)));
549
550 ND_PRINT("\n\t Connected Routers:");
551 ap = lsap->lsa_un.un_nla.nla_router;
552 while (lsa_length != 0) {
553 if (lsa_length < sizeof (*ap))
554 return (1);
555 lsa_length -= sizeof (*ap);
556 ND_TCHECK_SIZE(ap);
557 ND_PRINT("\n\t\t%s", GET_IPADDR_STRING(*ap));
558 ++ap;
559 }
560 break;
561
562 case LS_TYPE_INTER_AP | LS_SCOPE_AREA:
563 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric))
564 return (1);
565 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric);
566 ND_PRINT(", metric %u",
567 GET_BE_U_4(lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC);
568
569 tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix;
570 while (lsa_length != 0) {
571 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
572 if (bytelen < 0)
573 goto trunc;
574 /*
575 * ospf6_print_lsaprefix() will return -1 if
576 * the length is too high, so this will not
577 * underflow.
578 */
579 lsa_length -= bytelen;
580 tptr += bytelen;
581 }
582 break;
583
584 case LS_TYPE_ASE | LS_SCOPE_AS:
585 if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric))
586 return (1);
587 lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric);
588 flags32 = GET_BE_U_4(lsap->lsa_un.un_asla.asla_metric);
589 ND_PRINT("\n\t Flags [%s]",
590 bittok2str(ospf6_asla_flag_values, "none", flags32));
591 ND_PRINT(" metric %u",
592 GET_BE_U_4(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 /*
601 * ospf6_print_lsaprefix() will return -1 if
602 * the length is too high, so this will not
603 * underflow.
604 */
605 lsa_length -= bytelen;
606 tptr += bytelen;
607
608 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
609 if (lsa_length < sizeof (nd_ipv6))
610 return (1);
611 lsa_length -= sizeof (nd_ipv6);
612 ND_PRINT(" forward %s",
613 GET_IP6ADDR_STRING(tptr));
614 tptr += sizeof(nd_ipv6);
615 }
616
617 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
618 if (lsa_length < sizeof (uint32_t))
619 return (1);
620 lsa_length -= sizeof (uint32_t);
621 ND_PRINT(" tag %s",
622 GET_IPADDR_STRING(tptr));
623 tptr += sizeof(uint32_t);
624 }
625
626 if (GET_U_1(lsapp->lsa_p_metric)) {
627 if (lsa_length < sizeof (uint32_t))
628 return (1);
629 lsa_length -= sizeof (uint32_t);
630 ND_PRINT(" RefLSID: %s",
631 GET_IPADDR_STRING(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_SIZE(&llsap->llsa_priandopt);
643 ND_PRINT("\n\t Options [%s]",
644 bittok2str(ospf6_option_values, "none",
645 GET_BE_U_4(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 = GET_BE_U_4(llsap->llsa_nprefix);
651 ND_PRINT("\n\t Priority %u, Link-local address %s, Prefixes %u:",
652 GET_U_1(llsap->llsa_priority),
653 GET_IP6ADDR_STRING(llsap->llsa_lladdr),
654 prefixes);
655
656 tptr = (const 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 /*
663 * ospf6_print_lsaprefix() will return -1 if
664 * the length is too high, so this will not
665 * underflow.
666 */
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_4(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
678 ospf6_print_ls_type(ndo,
679 GET_BE_U_2(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 prefixes = GET_BE_U_2(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
686 ND_PRINT("\n\t Prefixes %u:", prefixes);
687
688 tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
689 while (prefixes > 0) {
690 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
691 if (bytelen < 0)
692 goto trunc;
693 prefixes--;
694 /*
695 * ospf6_print_lsaprefix() will return -1 if
696 * the length is too high, so this will not
697 * underflow.
698 */
699 lsa_length -= bytelen;
700 tptr += bytelen;
701 }
702 break;
703
704 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
705 if (ospf_grace_lsa_print(ndo, tptr, lsa_length) == -1) {
706 return 1;
707 }
708 break;
709
710 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
711 if (ospf_te_lsa_print(ndo, tptr, lsa_length) == -1) {
712 return 1;
713 }
714 break;
715
716 default:
717 if(!print_unknown_data(ndo,tptr,
718 "\n\t ",
719 lsa_length)) {
720 return (1);
721 }
722 break;
723 }
724
725 return (0);
726 trunc:
727 return (1);
728 }
729
730 static int
731 ospf6_decode_v3(netdissect_options *ndo,
732 const struct ospf6hdr *op,
733 const u_char *dataend)
734 {
735 const rtrid_t *ap;
736 const struct lsr6 *lsrp;
737 const struct lsa6_hdr *lshp;
738 const struct lsa6 *lsap;
739 int i;
740
741 switch (GET_U_1(op->ospf6_type)) {
742
743 case OSPF_TYPE_HELLO: {
744 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
745
746 ND_PRINT("\n\tOptions [%s]",
747 bittok2str(ospf6_option_values, "none",
748 GET_BE_U_4(hellop->hello_options)));
749
750 ND_PRINT("\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
751 GET_BE_U_2(hellop->hello_helloint),
752 GET_BE_U_2(hellop->hello_deadint),
753 GET_IPADDR_STRING(hellop->hello_ifid),
754 GET_U_1(hellop->hello_priority));
755
756 if (GET_BE_U_4(hellop->hello_dr) != 0)
757 ND_PRINT("\n\t Designated Router %s",
758 GET_IPADDR_STRING(hellop->hello_dr));
759 if (GET_BE_U_4(hellop->hello_bdr) != 0)
760 ND_PRINT(", Backup Designated Router %s",
761 GET_IPADDR_STRING(hellop->hello_bdr));
762 if (ndo->ndo_vflag > 1) {
763 ND_PRINT("\n\t Neighbor List:");
764 ap = hellop->hello_neighbor;
765 while ((const u_char *)ap < dataend) {
766 ND_TCHECK_SIZE(ap);
767 ND_PRINT("\n\t %s", GET_IPADDR_STRING(*ap));
768 ++ap;
769 }
770 }
771 break; /* HELLO */
772 }
773
774 case OSPF_TYPE_DD: {
775 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
776
777 ND_PRINT("\n\tOptions [%s]",
778 bittok2str(ospf6_option_values, "none",
779 GET_BE_U_4(ddp->db_options)));
780 ND_PRINT(", DD Flags [%s]",
781 bittok2str(ospf6_dd_flag_values,"none",GET_U_1(ddp->db_flags)));
782
783 ND_PRINT(", MTU %u, DD-Sequence 0x%08x",
784 GET_BE_U_2(ddp->db_mtu),
785 GET_BE_U_4(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_SIZE(lsrp);
802 ND_PRINT("\n\t Advertising Router %s",
803 GET_IPADDR_STRING(lsrp->ls_router));
804 ospf6_print_ls_type(ndo,
805 GET_BE_U_2(lsrp->ls_type),
806 &lsrp->ls_stateid);
807 ++lsrp;
808 }
809 }
810 break;
811
812 case OSPF_TYPE_LS_UPDATE:
813 if (ndo->ndo_vflag > 1) {
814 const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN);
815
816 i = GET_BE_U_4(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 GET_BE_U_2(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
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_PRINT("\n\tLLS Checksum 0x%04x", GET_BE_U_2(cp));
858 cp += 2;
859 /* LLS Data Length */
860 llsdatalen = GET_BE_U_2(cp);
861 ND_PRINT(", Data Length %u", llsdatalen);
862 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
863 goto trunc;
864 cp += 2;
865 /* LLS TLVs */
866 ND_TCHECK_LEN(cp, llsdatalen - OSPF_LLS_HDRLEN);
867 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */
868
869 return llsdatalen;
870 trunc:
871 return -1;
872 }
873
874 /* RFC6506 Section 4.1 */
875 static int
876 ospf6_decode_at(netdissect_options *ndo,
877 const u_char *cp, const u_int len)
878 {
879 uint16_t authdatalen;
880
881 if (len == 0)
882 return 0;
883 if (len < OSPF6_AT_HDRLEN)
884 goto trunc;
885 /* Authentication Type */
886 ND_PRINT("\n\tAuthentication Type %s",
887 tok2str(ospf6_auth_type_str, "unknown (0x%04x)", GET_BE_U_2(cp)));
888 cp += 2;
889 /* Auth Data Len */
890 authdatalen = GET_BE_U_2(cp);
891 ND_PRINT(", Length %u", authdatalen);
892 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
893 goto trunc;
894 cp += 2;
895 /* Reserved */
896 cp += 2;
897 /* Security Association ID */
898 ND_PRINT(", SAID %u", GET_BE_U_2(cp));
899 cp += 2;
900 /* Cryptographic Sequence Number (High-Order 32 Bits) */
901 ND_PRINT(", CSN 0x%08x", GET_BE_U_4(cp));
902 cp += 4;
903 /* Cryptographic Sequence Number (Low-Order 32 Bits) */
904 ND_PRINT(":%08x", GET_BE_U_4(cp));
905 cp += 4;
906 /* Authentication Data */
907 ND_TCHECK_LEN(cp, authdatalen - OSPF6_AT_HDRLEN);
908 if (ndo->ndo_vflag > 1)
909 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN);
910 return 0;
911
912 trunc:
913 return 1;
914 }
915
916 /* The trailing data may include LLS and/or AT data (in this specific order).
917 * LLS data may be present only in Hello and DBDesc packets with the L-bit set.
918 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in
919 * any other packet type, thus decode the AT data regardless of the AT-bit.
920 */
921 static int
922 ospf6_decode_v3_trailer(netdissect_options *ndo,
923 const struct ospf6hdr *op, const u_char *cp, const unsigned len)
924 {
925 uint8_t type;
926 int llslen = 0;
927 int lls_hello = 0;
928 int lls_dd = 0;
929
930 type = GET_U_1(op->ospf6_type);
931 if (type == OSPF_TYPE_HELLO) {
932 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
933 if (GET_BE_U_4(hellop->hello_options) & OSPF6_OPTION_L)
934 lls_hello = 1;
935 } else if (type == OSPF_TYPE_DD) {
936 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
937 if (GET_BE_U_4(ddp->db_options) & OSPF6_OPTION_L)
938 lls_dd = 1;
939 }
940 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0)
941 goto trunc;
942 return ospf6_decode_at(ndo, cp + llslen, len - llslen);
943
944 trunc:
945 return 1;
946 }
947
948 void
949 ospf6_print(netdissect_options *ndo,
950 const u_char *bp, u_int length)
951 {
952 const struct ospf6hdr *op;
953 const u_char *dataend;
954 const char *cp;
955 uint16_t datalen;
956
957 ndo->ndo_protocol = "ospf3";
958 op = (const struct ospf6hdr *)bp;
959
960 /* If the type is valid translate it, or just print the type */
961 /* value. If it's not valid, say so and return */
962 cp = tok2str(ospf6_type_values, "unknown packet type (%u)",
963 GET_U_1(op->ospf6_type));
964 ND_PRINT("OSPFv%u, %s, length %u", GET_U_1(op->ospf6_version), cp,
965 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 datalen = GET_BE_U_2(op->ospf6_len);
976 if (datalen > length) {
977 ND_PRINT(" [len %u]", datalen);
978 return;
979 }
980 dataend = bp + datalen;
981
982 ND_PRINT("\n\tRouter-ID %s", GET_IPADDR_STRING(op->ospf6_routerid));
983
984 if (GET_BE_U_4(op->ospf6_areaid) != 0)
985 ND_PRINT(", Area %s", GET_IPADDR_STRING(op->ospf6_areaid));
986 else
987 ND_PRINT(", Backbone Area");
988 if (GET_U_1(op->ospf6_instanceid))
989 ND_PRINT(", Instance %u", GET_U_1(op->ospf6_instanceid));
990
991 /* Do rest according to version. */
992 switch (GET_U_1(op->ospf6_version)) {
993
994 case 3:
995 /* ospf version 3 */
996 if (ospf6_decode_v3(ndo, op, dataend) ||
997 ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen))
998 goto trunc;
999 break;
1000 } /* end switch on version */
1001
1002 return;
1003 trunc:
1004 nd_print_trunc(ndo);
1005 }
[mirror] the TCPdump network dissector