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
ospf6_print_ls_type(netdissect_options * ndo,u_int ls_type,const rtrid_t * ls_stateid)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
ospf6_print_lshdr(netdissect_options * ndo,const struct lsa6_hdr * lshp,const u_char * dataend)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 %zu",
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)-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
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 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 memset(prefix, 0, sizeof(prefix));
429 GET_CPY_BYTES(prefix, lsapp->lsa_p_prefix, wordlen * 4);
430 ND_PRINT("\n\t\t%s/%u", ip6addr_string(ndo, prefix), /* local buffer, not packet data; don't use GET_IP6ADDR_STRING() */
431 GET_U_1(lsapp->lsa_p_len));
432 if (GET_U_1(lsapp->lsa_p_opt)) {
433 ND_PRINT(", Options [%s]",
434 bittok2str(ospf6_lsa_prefix_option_values,
435 "none", GET_U_1(lsapp->lsa_p_opt)));
436 }
437 ND_PRINT(", metric %u", GET_BE_U_2(lsapp->lsa_p_metric));
438 return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4;
439
440 trunc:
441 return -1;
442 }
443
444
445 /*
446 * Print a single link state advertisement. If truncated return 1, else 0.
447 */
448 static int
ospf6_print_lsa(netdissect_options * ndo,const struct lsa6 * lsap,const u_char * dataend)449 ospf6_print_lsa(netdissect_options *ndo,
450 const struct lsa6 *lsap, const u_char *dataend)
451 {
452 const struct rlalink6 *rlp;
453 #if 0
454 const struct tos_metric *tosp;
455 #endif
456 const rtrid_t *ap;
457 #if 0
458 const struct aslametric *almp;
459 const struct mcla *mcp;
460 #endif
461 const struct llsa *llsap;
462 const struct lsa6_prefix *lsapp;
463 #if 0
464 const uint32_t *lp;
465 #endif
466 u_int prefixes;
467 int bytelen;
468 u_int length, lsa_length;
469 uint32_t flags32;
470 const uint8_t *tptr;
471
472 if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend))
473 return (1);
474 length = GET_BE_U_2(lsap->ls_hdr.ls_length);
475
476 /*
477 * The LSA length includes the length of the header;
478 * it must have a value that's at least that length.
479 * If it does, find the length of what follows the
480 * header.
481 */
482 if (length < sizeof(struct lsa6_hdr) || (const u_char *)lsap + length > dataend)
483 return (1);
484 lsa_length = length - sizeof(struct lsa6_hdr);
485 tptr = (const uint8_t *)lsap+sizeof(struct lsa6_hdr);
486
487 switch (GET_BE_U_2(lsap->ls_hdr.ls_type)) {
488 case LS_TYPE_ROUTER | LS_SCOPE_AREA:
489 if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options))
490 return (1);
491 lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options);
492 ND_PRINT("\n\t Options [%s]",
493 bittok2str(ospf6_option_values, "none",
494 GET_BE_U_4(lsap->lsa_un.un_rla.rla_options)));
495 ND_PRINT(", RLA-Flags [%s]",
496 bittok2str(ospf6_rla_flag_values, "none",
497 GET_U_1(lsap->lsa_un.un_rla.rla_flags)));
498
499 rlp = lsap->lsa_un.un_rla.rla_link;
500 while (lsa_length != 0) {
501 if (lsa_length < sizeof (*rlp))
502 return (1);
503 lsa_length -= sizeof (*rlp);
504 ND_TCHECK_SIZE(rlp);
505 switch (GET_U_1(rlp->link_type)) {
506
507 case RLA_TYPE_VIRTUAL:
508 ND_PRINT("\n\t Virtual Link: Neighbor Router-ID %s"
509 "\n\t Neighbor Interface-ID %s, Interface %s",
510 GET_IPADDR_STRING(rlp->link_nrtid),
511 GET_IPADDR_STRING(rlp->link_nifid),
512 GET_IPADDR_STRING(rlp->link_ifid));
513 break;
514
515 case RLA_TYPE_ROUTER:
516 ND_PRINT("\n\t Neighbor Router-ID %s"
517 "\n\t Neighbor Interface-ID %s, Interface %s",
518 GET_IPADDR_STRING(rlp->link_nrtid),
519 GET_IPADDR_STRING(rlp->link_nifid),
520 GET_IPADDR_STRING(rlp->link_ifid));
521 break;
522
523 case RLA_TYPE_TRANSIT:
524 ND_PRINT("\n\t Neighbor Network-ID %s"
525 "\n\t Neighbor Interface-ID %s, Interface %s",
526 GET_IPADDR_STRING(rlp->link_nrtid),
527 GET_IPADDR_STRING(rlp->link_nifid),
528 GET_IPADDR_STRING(rlp->link_ifid));
529 break;
530
531 default:
532 ND_PRINT("\n\t Unknown Router Links Type 0x%02x",
533 GET_U_1(rlp->link_type));
534 return (0);
535 }
536 ND_PRINT(", metric %u", GET_BE_U_2(rlp->link_metric));
537 rlp++;
538 }
539 break;
540
541 case LS_TYPE_NETWORK | LS_SCOPE_AREA:
542 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options))
543 return (1);
544 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options);
545 ND_PRINT("\n\t Options [%s]",
546 bittok2str(ospf6_option_values, "none",
547 GET_BE_U_4(lsap->lsa_un.un_nla.nla_options)));
548
549 ND_PRINT("\n\t Connected Routers:");
550 ap = lsap->lsa_un.un_nla.nla_router;
551 while (lsa_length != 0) {
552 if (lsa_length < sizeof (*ap))
553 return (1);
554 lsa_length -= sizeof (*ap);
555 ND_TCHECK_SIZE(ap);
556 ND_PRINT("\n\t\t%s", GET_IPADDR_STRING(*ap));
557 ++ap;
558 }
559 break;
560
561 case LS_TYPE_INTER_AP | LS_SCOPE_AREA:
562 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric))
563 return (1);
564 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric);
565 ND_PRINT(", metric %u",
566 GET_BE_U_4(lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC);
567
568 tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix;
569 while (lsa_length != 0) {
570 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
571 if (bytelen < 0)
572 goto trunc;
573 /*
574 * ospf6_print_lsaprefix() will return -1 if
575 * the length is too high, so this will not
576 * underflow.
577 */
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 flags32 = GET_BE_U_4(lsap->lsa_un.un_asla.asla_metric);
588 ND_PRINT("\n\t Flags [%s]",
589 bittok2str(ospf6_asla_flag_values, "none", flags32));
590 ND_PRINT(" metric %u",
591 GET_BE_U_4(lsap->lsa_un.un_asla.asla_metric) &
592 ASLA_MASK_METRIC);
593
594 tptr = (const uint8_t *)lsap->lsa_un.un_asla.asla_prefix;
595 lsapp = (const struct lsa6_prefix *)tptr;
596 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
597 if (bytelen < 0)
598 goto trunc;
599 /*
600 * ospf6_print_lsaprefix() will return -1 if
601 * the length is too high, so this will not
602 * underflow.
603 */
604 lsa_length -= bytelen;
605 tptr += bytelen;
606
607 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
608 if (lsa_length < sizeof (nd_ipv6))
609 return (1);
610 lsa_length -= sizeof (nd_ipv6);
611 ND_PRINT(" forward %s",
612 GET_IP6ADDR_STRING(tptr));
613 tptr += sizeof(nd_ipv6);
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_PRINT(" tag %s",
621 GET_IPADDR_STRING(tptr));
622 tptr += sizeof(uint32_t);
623 }
624
625 if (GET_U_1(lsapp->lsa_p_metric)) {
626 if (lsa_length < sizeof (uint32_t))
627 return (1);
628 lsa_length -= sizeof (uint32_t);
629 ND_PRINT(" RefLSID: %s",
630 GET_IPADDR_STRING(tptr));
631 tptr += sizeof(uint32_t);
632 }
633 break;
634
635 case LS_TYPE_LINK:
636 /* Link LSA */
637 llsap = &lsap->lsa_un.un_llsa;
638 if (lsa_length < sizeof (llsap->llsa_priandopt))
639 return (1);
640 lsa_length -= sizeof (llsap->llsa_priandopt);
641 ND_TCHECK_SIZE(&llsap->llsa_priandopt);
642 ND_PRINT("\n\t Options [%s]",
643 bittok2str(ospf6_option_values, "none",
644 GET_BE_U_4(llsap->llsa_options)));
645
646 if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix))
647 return (1);
648 lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix);
649 prefixes = GET_BE_U_4(llsap->llsa_nprefix);
650 ND_PRINT("\n\t Priority %u, Link-local address %s, Prefixes %u:",
651 GET_U_1(llsap->llsa_priority),
652 GET_IP6ADDR_STRING(llsap->llsa_lladdr),
653 prefixes);
654
655 tptr = (const uint8_t *)llsap->llsa_prefix;
656 while (prefixes > 0) {
657 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
658 if (bytelen < 0)
659 goto trunc;
660 prefixes--;
661 /*
662 * ospf6_print_lsaprefix() will return -1 if
663 * the length is too high, so this will not
664 * underflow.
665 */
666 lsa_length -= bytelen;
667 tptr += bytelen;
668 }
669 break;
670
671 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA:
672 /* Intra-Area-Prefix LSA */
673 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid))
674 return (1);
675 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid);
676 ND_TCHECK_4(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
677 ospf6_print_ls_type(ndo,
678 GET_BE_U_2(lsap->lsa_un.un_intra_ap.intra_ap_lstype),
679 &lsap->lsa_un.un_intra_ap.intra_ap_lsid);
680
681 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix))
682 return (1);
683 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
684 prefixes = GET_BE_U_2(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
685 ND_PRINT("\n\t Prefixes %u:", prefixes);
686
687 tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
688 while (prefixes > 0) {
689 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length);
690 if (bytelen < 0)
691 goto trunc;
692 prefixes--;
693 /*
694 * ospf6_print_lsaprefix() will return -1 if
695 * the length is too high, so this will not
696 * underflow.
697 */
698 lsa_length -= bytelen;
699 tptr += bytelen;
700 }
701 break;
702
703 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
704 if (ospf_grace_lsa_print(ndo, tptr, lsa_length) == -1) {
705 return 1;
706 }
707 break;
708
709 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
710 if (ospf_te_lsa_print(ndo, tptr, lsa_length) == -1) {
711 return 1;
712 }
713 break;
714
715 default:
716 if(!print_unknown_data(ndo,tptr,
717 "\n\t ",
718 lsa_length)) {
719 return (1);
720 }
721 break;
722 }
723
724 return (0);
725 trunc:
726 return (1);
727 }
728
729 static int
ospf6_decode_v3(netdissect_options * ndo,const struct ospf6hdr * op,const u_char * dataend)730 ospf6_decode_v3(netdissect_options *ndo,
731 const struct ospf6hdr *op,
732 const u_char *dataend)
733 {
734 const rtrid_t *ap;
735 const struct lsr6 *lsrp;
736 const struct lsa6_hdr *lshp;
737 const struct lsa6 *lsap;
738 int i;
739
740 switch (GET_U_1(op->ospf6_type)) {
741
742 case OSPF_TYPE_HELLO: {
743 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
744
745 ND_PRINT("\n\tOptions [%s]",
746 bittok2str(ospf6_option_values, "none",
747 GET_BE_U_4(hellop->hello_options)));
748
749 ND_PRINT("\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
750 GET_BE_U_2(hellop->hello_helloint),
751 GET_BE_U_2(hellop->hello_deadint),
752 GET_IPADDR_STRING(hellop->hello_ifid),
753 GET_U_1(hellop->hello_priority));
754
755 if (GET_BE_U_4(hellop->hello_dr) != 0)
756 ND_PRINT("\n\t Designated Router %s",
757 GET_IPADDR_STRING(hellop->hello_dr));
758 if (GET_BE_U_4(hellop->hello_bdr) != 0)
759 ND_PRINT(", Backup Designated Router %s",
760 GET_IPADDR_STRING(hellop->hello_bdr));
761 if (ndo->ndo_vflag > 1) {
762 ND_PRINT("\n\t Neighbor List:");
763 ap = hellop->hello_neighbor;
764 while ((const u_char *)ap < dataend) {
765 ND_TCHECK_SIZE(ap);
766 ND_PRINT("\n\t %s", GET_IPADDR_STRING(*ap));
767 ++ap;
768 }
769 }
770 break; /* HELLO */
771 }
772
773 case OSPF_TYPE_DD: {
774 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
775
776 ND_PRINT("\n\tOptions [%s]",
777 bittok2str(ospf6_option_values, "none",
778 GET_BE_U_4(ddp->db_options)));
779 ND_PRINT(", DD Flags [%s]",
780 bittok2str(ospf6_dd_flag_values,"none",GET_U_1(ddp->db_flags)));
781
782 ND_PRINT(", MTU %u, DD-Sequence 0x%08x",
783 GET_BE_U_2(ddp->db_mtu),
784 GET_BE_U_4(ddp->db_seq));
785 if (ndo->ndo_vflag > 1) {
786 /* Print all the LS adv's */
787 lshp = ddp->db_lshdr;
788 while ((const u_char *)lshp < dataend) {
789 if (ospf6_print_lshdr(ndo, lshp++, dataend))
790 goto trunc;
791 }
792 }
793 break;
794 }
795
796 case OSPF_TYPE_LS_REQ:
797 if (ndo->ndo_vflag > 1) {
798 lsrp = (const struct lsr6 *)((const uint8_t *)op + OSPF6HDR_LEN);
799 while ((const u_char *)lsrp < dataend) {
800 ND_TCHECK_SIZE(lsrp);
801 ND_PRINT("\n\t Advertising Router %s",
802 GET_IPADDR_STRING(lsrp->ls_router));
803 ospf6_print_ls_type(ndo,
804 GET_BE_U_2(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 const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN);
814
815 i = GET_BE_U_4(lsup->lsu_count);
816 lsap = lsup->lsu_lsa;
817 while ((const u_char *)lsap < dataend && i--) {
818 if (ospf6_print_lsa(ndo, lsap, dataend))
819 goto trunc;
820 lsap = (const struct lsa6 *)((const u_char *)lsap +
821 GET_BE_U_2(lsap->ls_hdr.ls_length));
822 }
823 }
824 break;
825
826 case OSPF_TYPE_LS_ACK:
827 if (ndo->ndo_vflag > 1) {
828 lshp = (const struct lsa6_hdr *)((const uint8_t *)op + OSPF6HDR_LEN);
829 while ((const u_char *)lshp < dataend) {
830 if (ospf6_print_lshdr(ndo, lshp++, dataend))
831 goto trunc;
832 }
833 }
834 break;
835
836 default:
837 break;
838 }
839 return (0);
840 trunc:
841 return (1);
842 }
843
844 /* RFC5613 Section 2.2 (w/o the TLVs) */
845 static int
ospf6_print_lls(netdissect_options * ndo,const u_char * cp,const u_int len)846 ospf6_print_lls(netdissect_options *ndo,
847 const u_char *cp, const u_int len)
848 {
849 uint16_t llsdatalen;
850
851 if (len == 0)
852 return 0;
853 if (len < OSPF_LLS_HDRLEN)
854 goto trunc;
855 /* Checksum */
856 ND_PRINT("\n\tLLS Checksum 0x%04x", GET_BE_U_2(cp));
857 cp += 2;
858 /* LLS Data Length */
859 llsdatalen = GET_BE_U_2(cp);
860 ND_PRINT(", Data Length %u", llsdatalen);
861 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len)
862 goto trunc;
863 cp += 2;
864 /* LLS TLVs */
865 ND_TCHECK_LEN(cp, llsdatalen - OSPF_LLS_HDRLEN);
866 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */
867
868 return llsdatalen;
869 trunc:
870 return -1;
871 }
872
873 /* RFC6506 Section 4.1 */
874 static int
ospf6_decode_at(netdissect_options * ndo,const u_char * cp,const u_int len)875 ospf6_decode_at(netdissect_options *ndo,
876 const u_char *cp, const u_int len)
877 {
878 uint16_t authdatalen;
879
880 if (len == 0)
881 return 0;
882 if (len < OSPF6_AT_HDRLEN)
883 goto trunc;
884 /* Authentication Type */
885 ND_PRINT("\n\tAuthentication Type %s",
886 tok2str(ospf6_auth_type_str, "unknown (0x%04x)", GET_BE_U_2(cp)));
887 cp += 2;
888 /* Auth Data Len */
889 authdatalen = GET_BE_U_2(cp);
890 ND_PRINT(", Length %u", authdatalen);
891 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len)
892 goto trunc;
893 cp += 2;
894 /* Reserved */
895 cp += 2;
896 /* Security Association ID */
897 ND_PRINT(", SAID %u", GET_BE_U_2(cp));
898 cp += 2;
899 /* Cryptographic Sequence Number (High-Order 32 Bits) */
900 ND_PRINT(", CSN 0x%08x", GET_BE_U_4(cp));
901 cp += 4;
902 /* Cryptographic Sequence Number (Low-Order 32 Bits) */
903 ND_PRINT(":%08x", GET_BE_U_4(cp));
904 cp += 4;
905 /* Authentication Data */
906 ND_TCHECK_LEN(cp, authdatalen - OSPF6_AT_HDRLEN);
907 if (ndo->ndo_vflag > 1)
908 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN);
909 return 0;
910
911 trunc:
912 return 1;
913 }
914
915 /* The trailing data may include LLS and/or AT data (in this specific order).
916 * LLS data may be present only in Hello and DBDesc packets with the L-bit set.
917 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in
918 * any other packet type, thus decode the AT data regardless of the AT-bit.
919 */
920 static int
ospf6_decode_v3_trailer(netdissect_options * ndo,const struct ospf6hdr * op,const u_char * cp,const unsigned len)921 ospf6_decode_v3_trailer(netdissect_options *ndo,
922 const struct ospf6hdr *op, const u_char *cp, const unsigned len)
923 {
924 uint8_t type;
925 int llslen = 0;
926 int lls_hello = 0;
927 int lls_dd = 0;
928
929 type = GET_U_1(op->ospf6_type);
930 if (type == OSPF_TYPE_HELLO) {
931 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN);
932 if (GET_BE_U_4(hellop->hello_options) & OSPF6_OPTION_L)
933 lls_hello = 1;
934 } else if (type == OSPF_TYPE_DD) {
935 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN);
936 if (GET_BE_U_4(ddp->db_options) & OSPF6_OPTION_L)
937 lls_dd = 1;
938 }
939 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0)
940 goto trunc;
941 return ospf6_decode_at(ndo, cp + llslen, len - llslen);
942
943 trunc:
944 return 1;
945 }
946
947 void
ospf6_print(netdissect_options * ndo,const u_char * bp,u_int length)948 ospf6_print(netdissect_options *ndo,
949 const u_char *bp, u_int length)
950 {
951 const struct ospf6hdr *op;
952 const u_char *dataend;
953 const char *cp;
954 uint16_t datalen;
955
956 ndo->ndo_protocol = "ospf3";
957 op = (const struct ospf6hdr *)bp;
958
959 /* If the type is valid translate it, or just print the type */
960 /* value. If it's not valid, say so and return */
961 cp = tok2str(ospf6_type_values, "unknown packet type (%u)",
962 GET_U_1(op->ospf6_type));
963 ND_PRINT("OSPFv%u, %s, length %u", GET_U_1(op->ospf6_version), cp,
964 length);
965 if (*cp == 'u') {
966 return;
967 }
968
969 if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
970 return;
971 }
972
973 /* OSPFv3 data always comes first and optional trailing data may follow. */
974 datalen = GET_BE_U_2(op->ospf6_len);
975 if (datalen > length) {
976 ND_PRINT(" [len %u]", datalen);
977 return;
978 }
979 dataend = bp + datalen;
980
981 ND_PRINT("\n\tRouter-ID %s", GET_IPADDR_STRING(op->ospf6_routerid));
982
983 if (GET_BE_U_4(op->ospf6_areaid) != 0)
984 ND_PRINT(", Area %s", GET_IPADDR_STRING(op->ospf6_areaid));
985 else
986 ND_PRINT(", Backbone Area");
987 if (GET_U_1(op->ospf6_instanceid))
988 ND_PRINT(", Instance %u", GET_U_1(op->ospf6_instanceid));
989
990 /* Do rest according to version. */
991 switch (GET_U_1(op->ospf6_version)) {
992
993 case 3:
994 /* ospf version 3 */
995 if (ospf6_decode_v3(ndo, op, dataend) ||
996 ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen))
997 goto trunc;
998 break;
999 } /* end switch on version */
1000
1001 return;
1002 trunc:
1003 nd_print_trunc(ndo);
1004 }
1005