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718e3744 | 1 | /* |
2 | * OSPF Sending and Receiving OSPF Packets. | |
3 | * Copyright (C) 1999, 2000 Toshiaki Takada | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "thread.h" | |
26 | #include "memory.h" | |
27 | #include "linklist.h" | |
28 | #include "prefix.h" | |
29 | #include "if.h" | |
30 | #include "table.h" | |
31 | #include "sockunion.h" | |
32 | #include "stream.h" | |
33 | #include "log.h" | |
2dd8bb4e | 34 | #include "sockopt.h" |
484315fd | 35 | #include "checksum.h" |
c1a03d47 | 36 | #include "md5.h" |
718e3744 | 37 | |
38 | #include "ospfd/ospfd.h" | |
39 | #include "ospfd/ospf_network.h" | |
40 | #include "ospfd/ospf_interface.h" | |
41 | #include "ospfd/ospf_ism.h" | |
42 | #include "ospfd/ospf_asbr.h" | |
43 | #include "ospfd/ospf_lsa.h" | |
44 | #include "ospfd/ospf_lsdb.h" | |
45 | #include "ospfd/ospf_neighbor.h" | |
46 | #include "ospfd/ospf_nsm.h" | |
47 | #include "ospfd/ospf_packet.h" | |
48 | #include "ospfd/ospf_spf.h" | |
49 | #include "ospfd/ospf_flood.h" | |
50 | #include "ospfd/ospf_dump.h" | |
51 | ||
166b75c2 DS |
52 | /* |
53 | * OSPF Fragmentation / fragmented writes | |
54 | * | |
55 | * ospfd can support writing fragmented packets, for cases where | |
56 | * kernel will not fragment IP_HDRINCL and/or multicast destined | |
57 | * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However, | |
58 | * SunOS, probably BSD too, clobber the user supplied IP ID and IP | |
59 | * flags fields, hence user-space fragmentation will not work. | |
60 | * Only Linux is known to leave IP header unmolested. | |
61 | * Further, fragmentation really should be done the kernel, which already | |
62 | * supports it, and which avoids nasty IP ID state problems. | |
63 | * | |
64 | * Fragmentation of OSPF packets can be required on networks with router | |
65 | * with many many interfaces active in one area, or on networks with links | |
66 | * with low MTUs. | |
67 | */ | |
68 | #ifdef GNU_LINUX | |
69 | #define WANT_OSPF_WRITE_FRAGMENT | |
70 | #endif | |
71 | ||
718e3744 | 72 | /* Packet Type String. */ |
272ca1e3 | 73 | const struct message ospf_packet_type_str[] = |
718e3744 | 74 | { |
272ca1e3 DO |
75 | { OSPF_MSG_HELLO, "Hello" }, |
76 | { OSPF_MSG_DB_DESC, "Database Description" }, | |
77 | { OSPF_MSG_LS_REQ, "Link State Request" }, | |
78 | { OSPF_MSG_LS_UPD, "Link State Update" }, | |
79 | { OSPF_MSG_LS_ACK, "Link State Acknowledgment" }, | |
718e3744 | 80 | }; |
272ca1e3 DO |
81 | const size_t ospf_packet_type_str_max = sizeof (ospf_packet_type_str) / |
82 | sizeof (ospf_packet_type_str[0]); | |
718e3744 | 83 | |
75c8eabb DO |
84 | /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of |
85 | particular types, offset is the "type" field of a packet. */ | |
86 | static const u_int16_t ospf_packet_minlen[] = | |
87 | { | |
88 | 0, | |
89 | OSPF_HELLO_MIN_SIZE, | |
90 | OSPF_DB_DESC_MIN_SIZE, | |
91 | OSPF_LS_REQ_MIN_SIZE, | |
92 | OSPF_LS_UPD_MIN_SIZE, | |
93 | OSPF_LS_ACK_MIN_SIZE, | |
94 | }; | |
95 | ||
4e31de79 DO |
96 | /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular |
97 | types, offset is the "LSA type" field. */ | |
98 | static const u_int16_t ospf_lsa_minlen[] = | |
99 | { | |
100 | 0, | |
101 | OSPF_ROUTER_LSA_MIN_SIZE, | |
102 | OSPF_NETWORK_LSA_MIN_SIZE, | |
103 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
104 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
105 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
106 | 0, | |
107 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
108 | 0, | |
109 | 0, | |
110 | 0, | |
111 | 0, | |
112 | }; | |
113 | ||
bd5651f0 DO |
114 | /* for ospf_check_auth() */ |
115 | static int ospf_check_sum (struct ospf_header *); | |
116 | ||
718e3744 | 117 | /* OSPF authentication checking function */ |
4dadc291 | 118 | static int |
718e3744 | 119 | ospf_auth_type (struct ospf_interface *oi) |
120 | { | |
121 | int auth_type; | |
122 | ||
123 | if (OSPF_IF_PARAM (oi, auth_type) == OSPF_AUTH_NOTSET) | |
124 | auth_type = oi->area->auth_type; | |
125 | else | |
126 | auth_type = OSPF_IF_PARAM (oi, auth_type); | |
127 | ||
128 | /* Handle case where MD5 key list is not configured aka Cisco */ | |
129 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC && | |
130 | list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
131 | return OSPF_AUTH_NULL; | |
132 | ||
133 | return auth_type; | |
134 | ||
135 | } | |
136 | ||
718e3744 | 137 | struct ospf_packet * |
138 | ospf_packet_new (size_t size) | |
139 | { | |
140 | struct ospf_packet *new; | |
141 | ||
142 | new = XCALLOC (MTYPE_OSPF_PACKET, sizeof (struct ospf_packet)); | |
143 | new->s = stream_new (size); | |
144 | ||
145 | return new; | |
146 | } | |
147 | ||
148 | void | |
149 | ospf_packet_free (struct ospf_packet *op) | |
150 | { | |
151 | if (op->s) | |
152 | stream_free (op->s); | |
153 | ||
154 | XFREE (MTYPE_OSPF_PACKET, op); | |
155 | ||
156 | op = NULL; | |
157 | } | |
158 | ||
159 | struct ospf_fifo * | |
160 | ospf_fifo_new () | |
161 | { | |
162 | struct ospf_fifo *new; | |
163 | ||
164 | new = XCALLOC (MTYPE_OSPF_FIFO, sizeof (struct ospf_fifo)); | |
165 | return new; | |
166 | } | |
167 | ||
168 | /* Add new packet to fifo. */ | |
169 | void | |
170 | ospf_fifo_push (struct ospf_fifo *fifo, struct ospf_packet *op) | |
171 | { | |
172 | if (fifo->tail) | |
173 | fifo->tail->next = op; | |
174 | else | |
175 | fifo->head = op; | |
176 | ||
177 | fifo->tail = op; | |
178 | ||
179 | fifo->count++; | |
180 | } | |
181 | ||
aa276fd7 PJ |
182 | /* Add new packet to head of fifo. */ |
183 | static void | |
184 | ospf_fifo_push_head (struct ospf_fifo *fifo, struct ospf_packet *op) | |
185 | { | |
186 | op->next = fifo->head; | |
187 | ||
188 | if (fifo->tail == NULL) | |
189 | fifo->tail = op; | |
190 | ||
191 | fifo->head = op; | |
192 | ||
193 | fifo->count++; | |
194 | } | |
195 | ||
718e3744 | 196 | /* Delete first packet from fifo. */ |
197 | struct ospf_packet * | |
198 | ospf_fifo_pop (struct ospf_fifo *fifo) | |
199 | { | |
200 | struct ospf_packet *op; | |
201 | ||
202 | op = fifo->head; | |
203 | ||
204 | if (op) | |
205 | { | |
206 | fifo->head = op->next; | |
207 | ||
208 | if (fifo->head == NULL) | |
209 | fifo->tail = NULL; | |
210 | ||
211 | fifo->count--; | |
212 | } | |
213 | ||
214 | return op; | |
215 | } | |
216 | ||
217 | /* Return first fifo entry. */ | |
218 | struct ospf_packet * | |
219 | ospf_fifo_head (struct ospf_fifo *fifo) | |
220 | { | |
221 | return fifo->head; | |
222 | } | |
223 | ||
224 | /* Flush ospf packet fifo. */ | |
225 | void | |
226 | ospf_fifo_flush (struct ospf_fifo *fifo) | |
227 | { | |
228 | struct ospf_packet *op; | |
229 | struct ospf_packet *next; | |
230 | ||
231 | for (op = fifo->head; op; op = next) | |
232 | { | |
233 | next = op->next; | |
234 | ospf_packet_free (op); | |
235 | } | |
236 | fifo->head = fifo->tail = NULL; | |
237 | fifo->count = 0; | |
238 | } | |
239 | ||
240 | /* Free ospf packet fifo. */ | |
241 | void | |
242 | ospf_fifo_free (struct ospf_fifo *fifo) | |
243 | { | |
244 | ospf_fifo_flush (fifo); | |
245 | ||
246 | XFREE (MTYPE_OSPF_FIFO, fifo); | |
247 | } | |
248 | ||
249 | void | |
250 | ospf_packet_add (struct ospf_interface *oi, struct ospf_packet *op) | |
251 | { | |
c3eab871 | 252 | if (!oi->obuf) |
253 | { | |
254 | zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
255 | "destination %s) called with NULL obuf, ignoring " | |
256 | "(please report this bug)!\n", | |
257 | IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state), | |
272ca1e3 | 258 | LOOKUP (ospf_packet_type_str, stream_getc_from(op->s, 1)), |
c3eab871 | 259 | inet_ntoa (op->dst)); |
260 | return; | |
261 | } | |
262 | ||
718e3744 | 263 | /* Add packet to end of queue. */ |
264 | ospf_fifo_push (oi->obuf, op); | |
265 | ||
266 | /* Debug of packet fifo*/ | |
267 | /* ospf_fifo_debug (oi->obuf); */ | |
268 | } | |
269 | ||
aa276fd7 PJ |
270 | static void |
271 | ospf_packet_add_top (struct ospf_interface *oi, struct ospf_packet *op) | |
272 | { | |
273 | if (!oi->obuf) | |
274 | { | |
275 | zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
276 | "destination %s) called with NULL obuf, ignoring " | |
277 | "(please report this bug)!\n", | |
278 | IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state), | |
7e0e2cb1 | 279 | LOOKUP (ospf_packet_type_str, stream_getc_from(op->s, 1)), |
aa276fd7 PJ |
280 | inet_ntoa (op->dst)); |
281 | return; | |
282 | } | |
283 | ||
284 | /* Add packet to head of queue. */ | |
285 | ospf_fifo_push_head (oi->obuf, op); | |
286 | ||
287 | /* Debug of packet fifo*/ | |
288 | /* ospf_fifo_debug (oi->obuf); */ | |
289 | } | |
290 | ||
718e3744 | 291 | void |
292 | ospf_packet_delete (struct ospf_interface *oi) | |
293 | { | |
294 | struct ospf_packet *op; | |
295 | ||
296 | op = ospf_fifo_pop (oi->obuf); | |
297 | ||
298 | if (op) | |
299 | ospf_packet_free (op); | |
300 | } | |
301 | ||
718e3744 | 302 | struct ospf_packet * |
303 | ospf_packet_dup (struct ospf_packet *op) | |
304 | { | |
305 | struct ospf_packet *new; | |
306 | ||
37163d6d | 307 | if (stream_get_endp(op->s) != op->length) |
08c83671 AS |
308 | /* XXX size_t */ |
309 | zlog_warn ("ospf_packet_dup stream %lu ospf_packet %u size mismatch", | |
310 | (u_long)STREAM_SIZE(op->s), op->length); | |
30961a15 | 311 | |
312 | /* Reserve space for MD5 authentication that may be added later. */ | |
313 | new = ospf_packet_new (stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
fa81b713 | 314 | stream_copy (new->s, op->s); |
718e3744 | 315 | |
316 | new->dst = op->dst; | |
317 | new->length = op->length; | |
318 | ||
319 | return new; | |
320 | } | |
321 | ||
86f1fd96 | 322 | /* XXX inline */ |
f63f06da | 323 | static unsigned int |
86f1fd96 | 324 | ospf_packet_authspace (struct ospf_interface *oi) |
325 | { | |
326 | int auth = 0; | |
327 | ||
328 | if ( ospf_auth_type (oi) == OSPF_AUTH_CRYPTOGRAPHIC) | |
329 | auth = OSPF_AUTH_MD5_SIZE; | |
330 | ||
331 | return auth; | |
332 | } | |
333 | ||
4dadc291 | 334 | static unsigned int |
718e3744 | 335 | ospf_packet_max (struct ospf_interface *oi) |
336 | { | |
337 | int max; | |
338 | ||
86f1fd96 | 339 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
340 | ||
68b7339a | 341 | max -= (OSPF_HEADER_SIZE + sizeof (struct ip)); |
718e3744 | 342 | |
343 | return max; | |
344 | } | |
345 | ||
6b0655a2 | 346 | |
4dadc291 | 347 | static int |
2d8223c5 | 348 | ospf_check_md5_digest (struct ospf_interface *oi, struct ospf_header *ospfh) |
718e3744 | 349 | { |
c1a03d47 | 350 | MD5_CTX ctx; |
718e3744 | 351 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; |
718e3744 | 352 | struct crypt_key *ck; |
718e3744 | 353 | struct ospf_neighbor *nbr; |
2d8223c5 | 354 | u_int16_t length = ntohs (ospfh->length); |
718e3744 | 355 | |
718e3744 | 356 | /* Get secret key. */ |
357 | ck = ospf_crypt_key_lookup (OSPF_IF_PARAM (oi, auth_crypt), | |
358 | ospfh->u.crypt.key_id); | |
359 | if (ck == NULL) | |
360 | { | |
361 | zlog_warn ("interface %s: ospf_check_md5 no key %d", | |
362 | IF_NAME (oi), ospfh->u.crypt.key_id); | |
363 | return 0; | |
364 | } | |
365 | ||
366 | /* check crypto seqnum. */ | |
367 | nbr = ospf_nbr_lookup_by_routerid (oi->nbrs, &ospfh->router_id); | |
368 | ||
369 | if (nbr && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) | |
370 | { | |
371 | zlog_warn ("interface %s: ospf_check_md5 bad sequence %d (expect %d)", | |
372 | IF_NAME (oi), | |
373 | ntohl(ospfh->u.crypt.crypt_seqnum), | |
374 | ntohl(nbr->crypt_seqnum)); | |
375 | return 0; | |
376 | } | |
377 | ||
378 | /* Generate a digest for the ospf packet - their digest + our digest. */ | |
c1a03d47 | 379 | memset(&ctx, 0, sizeof(ctx)); |
380 | MD5Init(&ctx); | |
2d8223c5 | 381 | MD5Update(&ctx, ospfh, length); |
c1a03d47 | 382 | MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); |
383 | MD5Final(digest, &ctx); | |
718e3744 | 384 | |
385 | /* compare the two */ | |
2d8223c5 | 386 | if (memcmp ((caddr_t)ospfh + length, digest, OSPF_AUTH_MD5_SIZE)) |
718e3744 | 387 | { |
388 | zlog_warn ("interface %s: ospf_check_md5 checksum mismatch", | |
389 | IF_NAME (oi)); | |
390 | return 0; | |
391 | } | |
392 | ||
393 | /* save neighbor's crypt_seqnum */ | |
394 | if (nbr) | |
395 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
396 | return 1; | |
397 | } | |
398 | ||
399 | /* This function is called from ospf_write(), it will detect the | |
400 | authentication scheme and if it is MD5, it will change the sequence | |
401 | and update the MD5 digest. */ | |
4dadc291 | 402 | static int |
718e3744 | 403 | ospf_make_md5_digest (struct ospf_interface *oi, struct ospf_packet *op) |
404 | { | |
405 | struct ospf_header *ospfh; | |
daa4981e | 406 | unsigned char digest[OSPF_AUTH_MD5_SIZE] = {0}; |
c1a03d47 | 407 | MD5_CTX ctx; |
718e3744 | 408 | void *ibuf; |
9483e155 | 409 | u_int32_t t; |
718e3744 | 410 | struct crypt_key *ck; |
3623814a | 411 | const u_int8_t *auth_key; |
718e3744 | 412 | |
413 | ibuf = STREAM_DATA (op->s); | |
414 | ospfh = (struct ospf_header *) ibuf; | |
415 | ||
416 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
417 | return 0; | |
418 | ||
419 | /* We do this here so when we dup a packet, we don't have to | |
2518efd1 PJ |
420 | waste CPU rewriting other headers. |
421 | ||
422 | Note that quagga_time /deliberately/ is not used here */ | |
9483e155 | 423 | t = (time(NULL) & 0xFFFFFFFF); |
818e56cf | 424 | if (t > oi->crypt_seqnum) |
425 | oi->crypt_seqnum = t; | |
426 | else | |
427 | oi->crypt_seqnum++; | |
428 | ||
9483e155 | 429 | ospfh->u.crypt.crypt_seqnum = htonl (oi->crypt_seqnum); |
718e3744 | 430 | |
431 | /* Get MD5 Authentication key from auth_key list. */ | |
432 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
daa4981e | 433 | auth_key = (const u_int8_t *) digest; |
718e3744 | 434 | else |
435 | { | |
1eb8ef25 | 436 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
4dadc291 | 437 | auth_key = ck->auth_key; |
718e3744 | 438 | } |
439 | ||
440 | /* Generate a digest for the entire packet + our secret key. */ | |
c1a03d47 | 441 | memset(&ctx, 0, sizeof(ctx)); |
442 | MD5Init(&ctx); | |
443 | MD5Update(&ctx, ibuf, ntohs (ospfh->length)); | |
444 | MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
445 | MD5Final(digest, &ctx); | |
718e3744 | 446 | |
447 | /* Append md5 digest to the end of the stream. */ | |
718e3744 | 448 | stream_put (op->s, digest, OSPF_AUTH_MD5_SIZE); |
718e3744 | 449 | |
450 | /* We do *NOT* increment the OSPF header length. */ | |
30961a15 | 451 | op->length = ntohs (ospfh->length) + OSPF_AUTH_MD5_SIZE; |
452 | ||
37163d6d | 453 | if (stream_get_endp(op->s) != op->length) |
08c83671 AS |
454 | /* XXX size_t */ |
455 | zlog_warn("ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u", | |
456 | (u_long)stream_get_endp(op->s), op->length); | |
718e3744 | 457 | |
458 | return OSPF_AUTH_MD5_SIZE; | |
459 | } | |
460 | ||
6b0655a2 | 461 | |
4dadc291 | 462 | static int |
718e3744 | 463 | ospf_ls_req_timer (struct thread *thread) |
464 | { | |
465 | struct ospf_neighbor *nbr; | |
466 | ||
467 | nbr = THREAD_ARG (thread); | |
468 | nbr->t_ls_req = NULL; | |
469 | ||
470 | /* Send Link State Request. */ | |
471 | if (ospf_ls_request_count (nbr)) | |
472 | ospf_ls_req_send (nbr); | |
473 | ||
474 | /* Set Link State Request retransmission timer. */ | |
475 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | void | |
481 | ospf_ls_req_event (struct ospf_neighbor *nbr) | |
482 | { | |
483 | if (nbr->t_ls_req) | |
484 | { | |
485 | thread_cancel (nbr->t_ls_req); | |
486 | nbr->t_ls_req = NULL; | |
487 | } | |
488 | nbr->t_ls_req = thread_add_event (master, ospf_ls_req_timer, nbr, 0); | |
489 | } | |
490 | ||
491 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
492 | ospf_neighbor.c */ | |
493 | int | |
494 | ospf_ls_upd_timer (struct thread *thread) | |
495 | { | |
496 | struct ospf_neighbor *nbr; | |
497 | ||
498 | nbr = THREAD_ARG (thread); | |
499 | nbr->t_ls_upd = NULL; | |
500 | ||
501 | /* Send Link State Update. */ | |
502 | if (ospf_ls_retransmit_count (nbr) > 0) | |
503 | { | |
52dc7ee6 | 504 | struct list *update; |
718e3744 | 505 | struct ospf_lsdb *lsdb; |
506 | int i; | |
718e3744 | 507 | int retransmit_interval; |
508 | ||
718e3744 | 509 | retransmit_interval = OSPF_IF_PARAM (nbr->oi, retransmit_interval); |
510 | ||
511 | lsdb = &nbr->ls_rxmt; | |
512 | update = list_new (); | |
513 | ||
514 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
515 | { | |
516 | struct route_table *table = lsdb->type[i].db; | |
517 | struct route_node *rn; | |
518 | ||
519 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
520 | { | |
521 | struct ospf_lsa *lsa; | |
522 | ||
523 | if ((lsa = rn->info) != NULL) | |
524 | /* Don't retransmit an LSA if we received it within | |
525 | the last RxmtInterval seconds - this is to allow the | |
526 | neighbour a chance to acknowledge the LSA as it may | |
527 | have ben just received before the retransmit timer | |
528 | fired. This is a small tweak to what is in the RFC, | |
529 | but it will cut out out a lot of retransmit traffic | |
530 | - MAG */ | |
2518efd1 | 531 | if (tv_cmp (tv_sub (recent_relative_time (), lsa->tv_recv), |
718e3744 | 532 | int2tv (retransmit_interval)) >= 0) |
533 | listnode_add (update, rn->info); | |
534 | } | |
535 | } | |
536 | ||
537 | if (listcount (update) > 0) | |
538 | ospf_ls_upd_send (nbr, update, OSPF_SEND_PACKET_DIRECT); | |
539 | list_delete (update); | |
540 | } | |
541 | ||
542 | /* Set LS Update retransmission timer. */ | |
543 | OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | int | |
549 | ospf_ls_ack_timer (struct thread *thread) | |
550 | { | |
551 | struct ospf_interface *oi; | |
552 | ||
553 | oi = THREAD_ARG (thread); | |
554 | oi->t_ls_ack = NULL; | |
555 | ||
556 | /* Send Link State Acknowledgment. */ | |
557 | if (listcount (oi->ls_ack) > 0) | |
558 | ospf_ls_ack_send_delayed (oi); | |
559 | ||
560 | /* Set LS Ack timer. */ | |
561 | OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
0bfeca3f | 566 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
5dcbdf82 | 567 | static void |
6a99f831 | 568 | ospf_write_frags (int fd, struct ospf_packet *op, struct ip *iph, |
62d8e96a | 569 | struct msghdr *msg, unsigned int maxdatasize, |
37ccfa3d | 570 | unsigned int mtu, int flags, u_char type) |
0bfeca3f | 571 | { |
572 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
6a99f831 | 573 | u_int16_t offset; |
62d8e96a | 574 | struct iovec *iovp; |
6a99f831 | 575 | int ret; |
0bfeca3f | 576 | |
577 | assert ( op->length == stream_get_endp(op->s) ); | |
62d8e96a | 578 | assert (msg->msg_iovlen == 2); |
0bfeca3f | 579 | |
580 | /* we can but try. | |
581 | * | |
582 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
583 | * well as the IP_MF flag, making this all quite pointless. | |
584 | * | |
585 | * However, for a system on which IP_MF is left alone, and ip_id left | |
586 | * alone or else which sets same ip_id for each fragment this might | |
587 | * work, eg linux. | |
588 | * | |
589 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
590 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
591 | * be raised against the various kernels. | |
592 | */ | |
593 | ||
594 | /* set More Frag */ | |
595 | iph->ip_off |= IP_MF; | |
596 | ||
597 | /* ip frag offset is expressed in units of 8byte words */ | |
598 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
599 | ||
62d8e96a | 600 | iovp = &msg->msg_iov[1]; |
601 | ||
0bfeca3f | 602 | while ( (stream_get_endp(op->s) - stream_get_getp (op->s)) |
603 | > maxdatasize ) | |
604 | { | |
605 | /* data length of this frag is to next offset value */ | |
62d8e96a | 606 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; |
607 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
6a99f831 | 608 | assert (iph->ip_len <= mtu); |
0bfeca3f | 609 | |
18b12c38 | 610 | sockopt_iphdrincl_swab_htosys (iph); |
0bfeca3f | 611 | |
6a99f831 | 612 | ret = sendmsg (fd, msg, flags); |
0bfeca3f | 613 | |
18b12c38 | 614 | sockopt_iphdrincl_swab_systoh (iph); |
0bfeca3f | 615 | |
616 | if (ret < 0) | |
37ccfa3d | 617 | zlog_warn ("*** ospf_write_frags: sendmsg failed to %s," |
5dcbdf82 | 618 | " id %d, off %d, len %d, mtu %u failed with %s", |
619 | inet_ntoa (iph->ip_dst), | |
620 | iph->ip_id, | |
621 | iph->ip_off, | |
622 | iph->ip_len, | |
623 | mtu, | |
624 | safe_strerror (errno)); | |
0bfeca3f | 625 | |
37ccfa3d | 626 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) |
627 | { | |
2a42e285 | 628 | zlog_debug ("ospf_write_frags: sent id %d, off %d, len %d to %s\n", |
37ccfa3d | 629 | iph->ip_id, iph->ip_off, iph->ip_len, |
630 | inet_ntoa (iph->ip_dst)); | |
631 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
632 | { | |
2a42e285 | 633 | zlog_debug ("-----------------IP Header Dump----------------------"); |
37ccfa3d | 634 | ospf_ip_header_dump (iph); |
2a42e285 | 635 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 636 | } |
637 | } | |
638 | ||
0bfeca3f | 639 | iph->ip_off += offset; |
9985f83c | 640 | stream_forward_getp (op->s, iovp->iov_len); |
62d8e96a | 641 | iovp->iov_base = STREAM_PNT (op->s); |
0bfeca3f | 642 | } |
643 | ||
644 | /* setup for final fragment */ | |
62d8e96a | 645 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp (op->s); |
646 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
0bfeca3f | 647 | iph->ip_off &= (~IP_MF); |
648 | } | |
649 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
650 | ||
5dcbdf82 | 651 | static int |
718e3744 | 652 | ospf_write (struct thread *thread) |
653 | { | |
68980084 | 654 | struct ospf *ospf = THREAD_ARG (thread); |
718e3744 | 655 | struct ospf_interface *oi; |
e8f45e82 | 656 | struct ospf_interface *last_serviced_oi = NULL; |
718e3744 | 657 | struct ospf_packet *op; |
658 | struct sockaddr_in sa_dst; | |
718e3744 | 659 | struct ip iph; |
660 | struct msghdr msg; | |
62d8e96a | 661 | struct iovec iov[2]; |
68980084 | 662 | u_char type; |
663 | int ret; | |
664 | int flags = 0; | |
52dc7ee6 | 665 | struct listnode *node; |
0bfeca3f | 666 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 667 | static u_int16_t ipid = 0; |
6a99f831 | 668 | u_int16_t maxdatasize; |
233cc0fb | 669 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
68b7339a | 670 | #define OSPF_WRITE_IPHL_SHIFT 2 |
2f8f370e | 671 | int pkt_count = 0; |
718e3744 | 672 | |
68980084 | 673 | ospf->t_write = NULL; |
718e3744 | 674 | |
68980084 | 675 | node = listhead (ospf->oi_write_q); |
718e3744 | 676 | assert (node); |
1eb8ef25 | 677 | oi = listgetdata (node); |
718e3744 | 678 | assert (oi); |
0bfeca3f | 679 | |
680 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
68b7339a | 681 | /* seed ipid static with low order bits of time */ |
682 | if (ipid == 0) | |
683 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 684 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
685 | ||
e8f45e82 | 686 | while ((pkt_count < ospf->write_oi_count) && oi && (last_serviced_oi != oi)) |
2f8f370e | 687 | { |
e8f45e82 DS |
688 | /* If there is only packet in the queue, the oi is removed from |
689 | write-q, so fix up the last interface that was serviced */ | |
690 | if (last_serviced_oi == NULL) { | |
691 | last_serviced_oi = oi; | |
692 | } | |
2f8f370e | 693 | pkt_count++; |
233cc0fb | 694 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
de587d74 RW |
695 | /* convenience - max OSPF data per packet */ |
696 | maxdatasize = oi->ifp->mtu - sizeof (struct ip); | |
233cc0fb | 697 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
2f8f370e DS |
698 | /* Get one packet from queue. */ |
699 | op = ospf_fifo_head (oi->obuf); | |
700 | assert (op); | |
701 | assert (op->length >= OSPF_HEADER_SIZE); | |
702 | ||
703 | if (op->dst.s_addr == htonl (OSPF_ALLSPFROUTERS) | |
704 | || op->dst.s_addr == htonl (OSPF_ALLDROUTERS)) | |
705 | ospf_if_ipmulticast (ospf, oi->address, oi->ifp->ifindex); | |
706 | ||
707 | /* Rewrite the md5 signature & update the seq */ | |
708 | ospf_make_md5_digest (oi, op); | |
709 | ||
710 | /* Retrieve OSPF packet type. */ | |
711 | stream_set_getp (op->s, 1); | |
712 | type = stream_getc (op->s); | |
37ccfa3d | 713 | |
2f8f370e DS |
714 | /* reset get pointer */ |
715 | stream_set_getp (op->s, 0); | |
68b7339a | 716 | |
2f8f370e DS |
717 | memset (&iph, 0, sizeof (struct ip)); |
718 | memset (&sa_dst, 0, sizeof (sa_dst)); | |
68b7339a | 719 | |
2f8f370e | 720 | sa_dst.sin_family = AF_INET; |
6f0e3f6e | 721 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
2f8f370e | 722 | sa_dst.sin_len = sizeof(sa_dst); |
6f0e3f6e | 723 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
2f8f370e DS |
724 | sa_dst.sin_addr = op->dst; |
725 | sa_dst.sin_port = htons (0); | |
726 | ||
727 | /* Set DONTROUTE flag if dst is unicast. */ | |
728 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
729 | if (!IN_MULTICAST (htonl (op->dst.s_addr))) | |
730 | flags = MSG_DONTROUTE; | |
731 | ||
732 | iph.ip_hl = sizeof (struct ip) >> OSPF_WRITE_IPHL_SHIFT; | |
733 | /* it'd be very strange for header to not be 4byte-word aligned but.. */ | |
734 | if ( sizeof (struct ip) | |
735 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) ) | |
736 | iph.ip_hl++; /* we presume sizeof struct ip cant overflow ip_hl.. */ | |
68b7339a | 737 | |
2f8f370e DS |
738 | iph.ip_v = IPVERSION; |
739 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; | |
740 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; | |
68b7339a | 741 | |
0150c9c9 | 742 | #if defined(__DragonFly__) |
2f8f370e DS |
743 | /* |
744 | * DragonFly's raw socket expects ip_len/ip_off in network byte order. | |
745 | */ | |
746 | iph.ip_len = htons(iph.ip_len); | |
0150c9c9 DB |
747 | #endif |
748 | ||
0bfeca3f | 749 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
2f8f370e DS |
750 | /* XXX-MT: not thread-safe at all.. |
751 | * XXX: this presumes this is only programme sending OSPF packets | |
752 | * otherwise, no guarantee ipid will be unique | |
753 | */ | |
754 | iph.ip_id = ++ipid; | |
0bfeca3f | 755 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
756 | ||
2f8f370e DS |
757 | iph.ip_off = 0; |
758 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
759 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
760 | else | |
761 | iph.ip_ttl = OSPF_IP_TTL; | |
762 | iph.ip_p = IPPROTO_OSPFIGP; | |
763 | iph.ip_sum = 0; | |
764 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
765 | iph.ip_dst.s_addr = op->dst.s_addr; | |
766 | ||
767 | memset (&msg, 0, sizeof (msg)); | |
768 | msg.msg_name = (caddr_t) &sa_dst; | |
769 | msg.msg_namelen = sizeof (sa_dst); | |
770 | msg.msg_iov = iov; | |
771 | msg.msg_iovlen = 2; | |
772 | iov[0].iov_base = (char*)&iph; | |
773 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; | |
774 | iov[1].iov_base = STREAM_PNT (op->s); | |
775 | iov[1].iov_len = op->length; | |
68b7339a | 776 | |
2f8f370e DS |
777 | /* Sadly we can not rely on kernels to fragment packets because of either |
778 | * IP_HDRINCL and/or multicast destination being set. | |
779 | */ | |
0bfeca3f | 780 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
2f8f370e DS |
781 | if ( op->length > maxdatasize ) |
782 | ospf_write_frags (ospf->fd, op, &iph, &msg, maxdatasize, | |
783 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 784 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 785 | |
2f8f370e DS |
786 | /* send final fragment (could be first) */ |
787 | sockopt_iphdrincl_swab_htosys (&iph); | |
788 | ret = sendmsg (ospf->fd, &msg, flags); | |
789 | sockopt_iphdrincl_swab_systoh (&iph); | |
790 | if (IS_DEBUG_OSPF_EVENT) | |
791 | zlog_debug ("ospf_write to %s, " | |
792 | "id %d, off %d, len %d, interface %s, mtu %u:", | |
793 | inet_ntoa (iph.ip_dst), iph.ip_id, iph.ip_off, iph.ip_len, | |
794 | oi->ifp->name, oi->ifp->mtu); | |
718e3744 | 795 | |
2f8f370e DS |
796 | if (ret < 0) |
797 | zlog_warn ("*** sendmsg in ospf_write failed to %s, " | |
798 | "id %d, off %d, len %d, interface %s, mtu %u: %s", | |
799 | inet_ntoa (iph.ip_dst), iph.ip_id, iph.ip_off, iph.ip_len, | |
800 | oi->ifp->name, oi->ifp->mtu, safe_strerror (errno)); | |
718e3744 | 801 | |
2f8f370e DS |
802 | /* Show debug sending packet. */ |
803 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) | |
804 | { | |
805 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
806 | { | |
807 | zlog_debug ("-----------------------------------------------------"); | |
808 | ospf_ip_header_dump (&iph); | |
809 | stream_set_getp (op->s, 0); | |
810 | ospf_packet_dump (op->s); | |
811 | } | |
718e3744 | 812 | |
2f8f370e DS |
813 | zlog_debug ("%s sent to [%s] via [%s].", |
814 | LOOKUP (ospf_packet_type_str, type), inet_ntoa (op->dst), | |
815 | IF_NAME (oi)); | |
816 | ||
817 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
818 | zlog_debug ("-----------------------------------------------------"); | |
819 | } | |
718e3744 | 820 | |
2f8f370e DS |
821 | /* Now delete packet from queue. */ |
822 | ospf_packet_delete (oi); | |
718e3744 | 823 | |
e8f45e82 DS |
824 | /* Move this interface to the tail of write_q to |
825 | serve everyone in a round robin fashion */ | |
826 | list_delete_node (ospf->oi_write_q, node); | |
827 | if (ospf_fifo_head (oi->obuf) == NULL) | |
828 | { | |
829 | oi->on_write_q = 0; | |
830 | last_serviced_oi = NULL; | |
831 | oi = NULL; | |
832 | } | |
833 | else | |
834 | { | |
835 | listnode_add (ospf->oi_write_q, oi); | |
836 | } | |
837 | ||
838 | /* Setup to service from the head of the queue again */ | |
839 | if (!list_isempty (ospf->oi_write_q)) | |
840 | { | |
841 | node = listhead (ospf->oi_write_q); | |
842 | assert (node); | |
843 | oi = listgetdata (node); | |
844 | assert (oi); | |
845 | } | |
846 | } | |
718e3744 | 847 | |
848 | /* If packets still remain in queue, call write thread. */ | |
68980084 | 849 | if (!list_isempty (ospf->oi_write_q)) |
850 | ospf->t_write = | |
851 | thread_add_write (master, ospf_write, ospf, ospf->fd); | |
718e3744 | 852 | |
853 | return 0; | |
854 | } | |
855 | ||
856 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
4dadc291 | 857 | static void |
718e3744 | 858 | ospf_hello (struct ip *iph, struct ospf_header *ospfh, |
859 | struct stream * s, struct ospf_interface *oi, int size) | |
860 | { | |
861 | struct ospf_hello *hello; | |
862 | struct ospf_neighbor *nbr; | |
718e3744 | 863 | int old_state; |
d3f0d621 | 864 | struct prefix p; |
718e3744 | 865 | |
866 | /* increment statistics. */ | |
867 | oi->hello_in++; | |
868 | ||
869 | hello = (struct ospf_hello *) STREAM_PNT (s); | |
870 | ||
871 | /* If Hello is myself, silently discard. */ | |
68980084 | 872 | if (IPV4_ADDR_SAME (&ospfh->router_id, &oi->ospf->router_id)) |
d324181c | 873 | { |
874 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
875 | { | |
2a42e285 | 876 | zlog_debug ("ospf_header[%s/%s]: selforiginated, " |
d324181c | 877 | "dropping.", |
272ca1e3 | 878 | LOOKUP (ospf_packet_type_str, ospfh->type), |
d324181c | 879 | inet_ntoa (iph->ip_src)); |
880 | } | |
881 | return; | |
882 | } | |
718e3744 | 883 | |
718e3744 | 884 | /* get neighbor prefix. */ |
885 | p.family = AF_INET; | |
886 | p.prefixlen = ip_masklen (hello->network_mask); | |
887 | p.u.prefix4 = iph->ip_src; | |
888 | ||
889 | /* Compare network mask. */ | |
890 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
891 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
892 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
893 | if (oi->address->prefixlen != p.prefixlen) | |
894 | { | |
13cd3dc1 AS |
895 | zlog_warn ("Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).", |
896 | inet_ntoa(ospfh->router_id), IF_NAME(oi), | |
897 | (int)oi->address->prefixlen, (int)p.prefixlen); | |
718e3744 | 898 | return; |
899 | } | |
900 | ||
718e3744 | 901 | /* Compare Router Dead Interval. */ |
902 | if (OSPF_IF_PARAM (oi, v_wait) != ntohl (hello->dead_interval)) | |
903 | { | |
08c83671 AS |
904 | zlog_warn ("Packet %s [Hello:RECV]: RouterDeadInterval mismatch " |
905 | "(expected %u, but received %u).", | |
906 | inet_ntoa(ospfh->router_id), | |
907 | OSPF_IF_PARAM(oi, v_wait), ntohl(hello->dead_interval)); | |
718e3744 | 908 | return; |
909 | } | |
910 | ||
f9ad937f | 911 | /* Compare Hello Interval - ignored if fast-hellos are set. */ |
912 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) | |
913 | { | |
914 | if (OSPF_IF_PARAM (oi, v_hello) != ntohs (hello->hello_interval)) | |
915 | { | |
08c83671 AS |
916 | zlog_warn ("Packet %s [Hello:RECV]: HelloInterval mismatch " |
917 | "(expected %u, but received %u).", | |
918 | inet_ntoa(ospfh->router_id), | |
919 | OSPF_IF_PARAM(oi, v_hello), ntohs(hello->hello_interval)); | |
f9ad937f | 920 | return; |
921 | } | |
922 | } | |
923 | ||
718e3744 | 924 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 925 | zlog_debug ("Packet %s [Hello:RECV]: Options %s", |
718e3744 | 926 | inet_ntoa (ospfh->router_id), |
927 | ospf_options_dump (hello->options)); | |
928 | ||
929 | /* Compare options. */ | |
930 | #define REJECT_IF_TBIT_ON 1 /* XXX */ | |
931 | #ifdef REJECT_IF_TBIT_ON | |
16f1b9ee | 932 | if (CHECK_FLAG (hello->options, OSPF_OPTION_MT)) |
718e3744 | 933 | { |
934 | /* | |
935 | * This router does not support non-zero TOS. | |
936 | * Drop this Hello packet not to establish neighbor relationship. | |
937 | */ | |
938 | zlog_warn ("Packet %s [Hello:RECV]: T-bit on, drop it.", | |
939 | inet_ntoa (ospfh->router_id)); | |
940 | return; | |
941 | } | |
942 | #endif /* REJECT_IF_TBIT_ON */ | |
943 | ||
68980084 | 944 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
718e3744 | 945 | && CHECK_FLAG (hello->options, OSPF_OPTION_O)) |
946 | { | |
947 | /* | |
948 | * This router does know the correct usage of O-bit | |
949 | * the bit should be set in DD packet only. | |
950 | */ | |
951 | zlog_warn ("Packet %s [Hello:RECV]: O-bit abuse?", | |
952 | inet_ntoa (ospfh->router_id)); | |
953 | #ifdef STRICT_OBIT_USAGE_CHECK | |
954 | return; /* Reject this packet. */ | |
955 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
956 | UNSET_FLAG (hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
957 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
958 | } | |
718e3744 | 959 | |
960 | /* new for NSSA is to ensure that NP is on and E is off */ | |
961 | ||
718e3744 | 962 | if (oi->area->external_routing == OSPF_AREA_NSSA) |
963 | { | |
964 | if (! (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_NP) | |
965 | && CHECK_FLAG (hello->options, OSPF_OPTION_NP) | |
966 | && ! CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) | |
967 | && ! CHECK_FLAG (hello->options, OSPF_OPTION_E))) | |
968 | { | |
969 | zlog_warn ("NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", inet_ntoa (ospfh->router_id), OPTIONS (oi), hello->options); | |
970 | return; | |
971 | } | |
972 | if (IS_DEBUG_OSPF_NSSA) | |
2a42e285 | 973 | zlog_debug ("NSSA-Hello:RECV:Packet from %s:", inet_ntoa(ospfh->router_id)); |
718e3744 | 974 | } |
975 | else | |
718e3744 | 976 | /* The setting of the E-bit found in the Hello Packet's Options |
977 | field must match this area's ExternalRoutingCapability A | |
978 | mismatch causes processing to stop and the packet to be | |
979 | dropped. The setting of the rest of the bits in the Hello | |
980 | Packet's Options field should be ignored. */ | |
981 | if (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) != | |
982 | CHECK_FLAG (hello->options, OSPF_OPTION_E)) | |
983 | { | |
3aa8d5f9 | 984 | zlog_warn ("Packet %s [Hello:RECV]: my options: %x, his options %x", |
985 | inet_ntoa(ospfh->router_id), OPTIONS (oi), hello->options); | |
718e3744 | 986 | return; |
987 | } | |
718e3744 | 988 | |
d3f0d621 | 989 | /* get neighbour struct */ |
990 | nbr = ospf_nbr_get (oi, ospfh, iph, &p); | |
991 | ||
992 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
993 | assert (nbr); | |
718e3744 | 994 | |
995 | old_state = nbr->state; | |
996 | ||
997 | /* Add event to thread. */ | |
57c5c652 | 998 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); |
718e3744 | 999 | |
1000 | /* RFC2328 Section 9.5.1 | |
1001 | If the router is not eligible to become Designated Router, | |
1002 | (snip) It must also send an Hello Packet in reply to an | |
1003 | Hello Packet received from any eligible neighbor (other than | |
1004 | the current Designated Router and Backup Designated Router). */ | |
1005 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1006 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
1007 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
1008 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
1009 | OSPF_NSM_TIMER_ON (nbr->t_hello_reply, ospf_hello_reply_timer, | |
1010 | OSPF_HELLO_REPLY_DELAY); | |
1011 | ||
1012 | /* on NBMA network type, it happens to receive bidirectional Hello packet | |
1013 | without advance 1-Way Received event. | |
1014 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
1015 | if (oi->type == OSPF_IFTYPE_NBMA && | |
1016 | (old_state == NSM_Down || old_state == NSM_Attempt)) | |
1017 | { | |
57c5c652 | 1018 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_OneWayReceived); |
718e3744 | 1019 | nbr->priority = hello->priority; |
1020 | nbr->d_router = hello->d_router; | |
1021 | nbr->bd_router = hello->bd_router; | |
1022 | return; | |
1023 | } | |
1024 | ||
68980084 | 1025 | if (ospf_nbr_bidirectional (&oi->ospf->router_id, hello->neighbors, |
718e3744 | 1026 | size - OSPF_HELLO_MIN_SIZE)) |
1027 | { | |
57c5c652 | 1028 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_TwoWayReceived); |
718e3744 | 1029 | nbr->options |= hello->options; |
1030 | } | |
1031 | else | |
1032 | { | |
57c5c652 | 1033 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_OneWayReceived); |
718e3744 | 1034 | /* Set neighbor information. */ |
1035 | nbr->priority = hello->priority; | |
1036 | nbr->d_router = hello->d_router; | |
1037 | nbr->bd_router = hello->bd_router; | |
1038 | return; | |
1039 | } | |
1040 | ||
1041 | /* If neighbor itself declares DR and no BDR exists, | |
1042 | cause event BackupSeen */ | |
1043 | if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router)) | |
1044 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
1045 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
1046 | ||
1047 | /* neighbor itself declares BDR. */ | |
1048 | if (oi->state == ISM_Waiting && | |
1049 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router)) | |
1050 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
1051 | ||
1052 | /* had not previously. */ | |
1053 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router) && | |
1054 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->d_router)) || | |
1055 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->d_router) && | |
1056 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->d_router))) | |
1057 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
1058 | ||
1059 | /* had not previously. */ | |
1060 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router) && | |
1061 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->bd_router)) || | |
1062 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->bd_router) && | |
1063 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->bd_router))) | |
1064 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
1065 | ||
1066 | /* Neighbor priority check. */ | |
1067 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
1068 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
1069 | ||
1070 | /* Set neighbor information. */ | |
1071 | nbr->priority = hello->priority; | |
1072 | nbr->d_router = hello->d_router; | |
1073 | nbr->bd_router = hello->bd_router; | |
1074 | } | |
1075 | ||
1076 | /* Save DD flags/options/Seqnum received. */ | |
4dadc291 | 1077 | static void |
718e3744 | 1078 | ospf_db_desc_save_current (struct ospf_neighbor *nbr, |
1079 | struct ospf_db_desc *dd) | |
1080 | { | |
1081 | nbr->last_recv.flags = dd->flags; | |
1082 | nbr->last_recv.options = dd->options; | |
1083 | nbr->last_recv.dd_seqnum = ntohl (dd->dd_seqnum); | |
1084 | } | |
1085 | ||
1086 | /* Process rest of DD packet. */ | |
1087 | static void | |
1088 | ospf_db_desc_proc (struct stream *s, struct ospf_interface *oi, | |
1089 | struct ospf_neighbor *nbr, struct ospf_db_desc *dd, | |
1090 | u_int16_t size) | |
1091 | { | |
1092 | struct ospf_lsa *new, *find; | |
1093 | struct lsa_header *lsah; | |
1094 | ||
9985f83c | 1095 | stream_forward_getp (s, OSPF_DB_DESC_MIN_SIZE); |
718e3744 | 1096 | for (size -= OSPF_DB_DESC_MIN_SIZE; |
1097 | size >= OSPF_LSA_HEADER_SIZE; size -= OSPF_LSA_HEADER_SIZE) | |
1098 | { | |
1099 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
9985f83c | 1100 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 1101 | |
1102 | /* Unknown LS type. */ | |
1103 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
1104 | { | |
bec595ad | 1105 | zlog_warn ("Packet [DD:RECV]: Unknown LS type %d.", lsah->type); |
718e3744 | 1106 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1107 | return; | |
1108 | } | |
1109 | ||
718e3744 | 1110 | if (IS_OPAQUE_LSA (lsah->type) |
1111 | && ! CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1112 | { | |
1113 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1114 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1115 | return; | |
1116 | } | |
718e3744 | 1117 | |
1118 | switch (lsah->type) | |
1119 | { | |
1120 | case OSPF_AS_EXTERNAL_LSA: | |
718e3744 | 1121 | case OSPF_OPAQUE_AS_LSA: |
718e3744 | 1122 | /* Check for stub area. Reject if AS-External from stub but |
1123 | allow if from NSSA. */ | |
1124 | if (oi->area->external_routing == OSPF_AREA_STUB) | |
718e3744 | 1125 | { |
1126 | zlog_warn ("Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", | |
1127 | lsah->type, inet_ntoa (lsah->id), | |
1128 | (oi->area->external_routing == OSPF_AREA_STUB) ?\ | |
1129 | "STUB" : "NSSA"); | |
1130 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1131 | return; | |
1132 | } | |
1133 | break; | |
1134 | default: | |
1135 | break; | |
1136 | } | |
1137 | ||
1138 | /* Create LS-request object. */ | |
1139 | new = ospf_ls_request_new (lsah); | |
1140 | ||
1141 | /* Lookup received LSA, then add LS request list. */ | |
1142 | find = ospf_lsa_lookup_by_header (oi->area, lsah); | |
f0894cf8 PJ |
1143 | |
1144 | /* ospf_lsa_more_recent is fine with NULL pointers */ | |
1145 | switch (ospf_lsa_more_recent (find, new)) | |
1146 | { | |
1147 | case -1: | |
1148 | /* Neighbour has a more recent LSA, we must request it */ | |
1149 | ospf_ls_request_add (nbr, new); | |
1150 | case 0: | |
1151 | /* If we have a copy of this LSA, it's either less recent | |
1152 | * and we're requesting it from neighbour (the case above), or | |
1153 | * it's as recent and we both have same copy (this case). | |
1154 | * | |
1155 | * In neither of these two cases is there any point in | |
1156 | * describing our copy of the LSA to the neighbour in a | |
1157 | * DB-Summary packet, if we're still intending to do so. | |
1158 | * | |
1159 | * See: draft-ogier-ospf-dbex-opt-00.txt, describing the | |
1160 | * backward compatible optimisation to OSPF DB Exchange / | |
1161 | * DB Description process implemented here. | |
1162 | */ | |
1163 | if (find) | |
1164 | ospf_lsdb_delete (&nbr->db_sum, find); | |
1165 | ospf_lsa_discard (new); | |
1166 | break; | |
1167 | default: | |
1168 | /* We have the more recent copy, nothing specific to do: | |
1169 | * - no need to request neighbours stale copy | |
1170 | * - must leave DB summary list copy alone | |
1171 | */ | |
1172 | if (IS_DEBUG_OSPF_EVENT) | |
1173 | zlog_debug ("Packet [DD:RECV]: LSA received Type %d, " | |
1174 | "ID %s is not recent.", lsah->type, inet_ntoa (lsah->id)); | |
1175 | ospf_lsa_discard (new); | |
1176 | } | |
718e3744 | 1177 | } |
1178 | ||
1179 | /* Master */ | |
1180 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1181 | { | |
1182 | nbr->dd_seqnum++; | |
8dd24ee6 PJ |
1183 | |
1184 | /* Both sides have no More, then we're done with Exchange */ | |
718e3744 | 1185 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) |
1186 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
1187 | else | |
718e3744 | 1188 | ospf_db_desc_send (nbr); |
1189 | } | |
1190 | /* Slave */ | |
1191 | else | |
1192 | { | |
1193 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); | |
1194 | ||
8dd24ee6 PJ |
1195 | /* Send DD packet in reply. |
1196 | * | |
1197 | * Must be done to acknowledge the Master's DD, regardless of | |
1198 | * whether we have more LSAs ourselves to describe. | |
1199 | * | |
1200 | * This function will clear the 'More' bit, if after this DD | |
1201 | * we have no more LSAs to describe to the master.. | |
1202 | */ | |
718e3744 | 1203 | ospf_db_desc_send (nbr); |
8dd24ee6 PJ |
1204 | |
1205 | /* Slave can raise ExchangeDone now, if master is also done */ | |
1206 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) | |
1207 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
718e3744 | 1208 | } |
8dd24ee6 | 1209 | |
718e3744 | 1210 | /* Save received neighbor values from DD. */ |
1211 | ospf_db_desc_save_current (nbr, dd); | |
97dba7b7 DS |
1212 | |
1213 | if (!nbr->t_ls_req) | |
1214 | ospf_ls_req_send (nbr); | |
718e3744 | 1215 | } |
1216 | ||
4dadc291 | 1217 | static int |
718e3744 | 1218 | ospf_db_desc_is_dup (struct ospf_db_desc *dd, struct ospf_neighbor *nbr) |
1219 | { | |
1220 | /* Is DD duplicated? */ | |
1221 | if (dd->options == nbr->last_recv.options && | |
1222 | dd->flags == nbr->last_recv.flags && | |
1223 | dd->dd_seqnum == htonl (nbr->last_recv.dd_seqnum)) | |
1224 | return 1; | |
1225 | ||
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
3aa8d5f9 | 1230 | static void |
718e3744 | 1231 | ospf_db_desc (struct ip *iph, struct ospf_header *ospfh, |
1232 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1233 | { | |
1234 | struct ospf_db_desc *dd; | |
1235 | struct ospf_neighbor *nbr; | |
1236 | ||
1237 | /* Increment statistics. */ | |
1238 | oi->db_desc_in++; | |
1239 | ||
1240 | dd = (struct ospf_db_desc *) STREAM_PNT (s); | |
d363df2c | 1241 | |
d3f0d621 | 1242 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1243 | if (nbr == NULL) |
1244 | { | |
1245 | zlog_warn ("Packet[DD]: Unknown Neighbor %s", | |
1246 | inet_ntoa (ospfh->router_id)); | |
1247 | return; | |
1248 | } | |
1249 | ||
1250 | /* Check MTU. */ | |
ba682537 | 1251 | if ((OSPF_IF_PARAM (oi, mtu_ignore) == 0) && |
1252 | (ntohs (dd->mtu) > oi->ifp->mtu)) | |
718e3744 | 1253 | { |
3aa8d5f9 | 1254 | zlog_warn ("Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", |
1255 | inet_ntoa (nbr->router_id), ntohs (dd->mtu), | |
1256 | IF_NAME (oi), oi->ifp->mtu); | |
718e3744 | 1257 | return; |
1258 | } | |
1259 | ||
d363df2c | 1260 | /* |
1261 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is not | |
1262 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1263 | * Until proper solution is developped, this hack should help. | |
1264 | * | |
1265 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1266 | * options, unfortunately its use in DD options is not specified. Hence some | |
1267 | * implementations follow E-bit semantics and set it in DD options, and some | |
1268 | * treat it as unspecified and hence follow the directive "default for | |
1269 | * options is clear", ie unset. | |
1270 | * | |
1271 | * Reset the flag, as ospfd follows E-bit semantics. | |
1272 | */ | |
1273 | if ( (oi->area->external_routing == OSPF_AREA_NSSA) | |
1274 | && (CHECK_FLAG (nbr->options, OSPF_OPTION_NP)) | |
1275 | && (!CHECK_FLAG (dd->options, OSPF_OPTION_NP)) ) | |
1276 | { | |
1277 | if (IS_DEBUG_OSPF_EVENT) | |
1210fa66 | 1278 | zlog_debug ("Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", |
d363df2c | 1279 | inet_ntoa (nbr->router_id) ); |
1280 | SET_FLAG (dd->options, OSPF_OPTION_NP); | |
1281 | } | |
d363df2c | 1282 | |
718e3744 | 1283 | #ifdef REJECT_IF_TBIT_ON |
16f1b9ee | 1284 | if (CHECK_FLAG (dd->options, OSPF_OPTION_MT)) |
718e3744 | 1285 | { |
1286 | /* | |
1287 | * In Hello protocol, optional capability must have checked | |
1288 | * to prevent this T-bit enabled router be my neighbor. | |
1289 | */ | |
1290 | zlog_warn ("Packet[DD]: Neighbor %s: T-bit on?", inet_ntoa (nbr->router_id)); | |
1291 | return; | |
1292 | } | |
1293 | #endif /* REJECT_IF_TBIT_ON */ | |
1294 | ||
718e3744 | 1295 | if (CHECK_FLAG (dd->options, OSPF_OPTION_O) |
68980084 | 1296 | && !CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1297 | { |
1298 | /* | |
1299 | * This node is not configured to handle O-bit, for now. | |
1300 | * Clear it to ignore unsupported capability proposed by neighbor. | |
1301 | */ | |
1302 | UNSET_FLAG (dd->options, OSPF_OPTION_O); | |
1303 | } | |
718e3744 | 1304 | |
57c5c652 PJ |
1305 | /* Add event to thread. */ |
1306 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
1307 | ||
718e3744 | 1308 | /* Process DD packet by neighbor status. */ |
1309 | switch (nbr->state) | |
1310 | { | |
1311 | case NSM_Down: | |
1312 | case NSM_Attempt: | |
1313 | case NSM_TwoWay: | |
bec595ad | 1314 | zlog_warn ("Packet[DD]: Neighbor %s state is %s, packet discarded.", |
3aa8d5f9 | 1315 | inet_ntoa(nbr->router_id), |
718e3744 | 1316 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1317 | break; | |
1318 | case NSM_Init: | |
1319 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived); | |
1320 | /* If the new state is ExStart, the processing of the current | |
1321 | packet should then continue in this new state by falling | |
1322 | through to case ExStart below. */ | |
1323 | if (nbr->state != NSM_ExStart) | |
1324 | break; | |
1325 | case NSM_ExStart: | |
1326 | /* Initial DBD */ | |
1327 | if ((IS_SET_DD_ALL (dd->flags) == OSPF_DD_FLAG_ALL) && | |
1328 | (size == OSPF_DB_DESC_MIN_SIZE)) | |
1329 | { | |
68980084 | 1330 | if (IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) > 0) |
718e3744 | 1331 | { |
1332 | /* We're Slave---obey */ | |
17eaa728 | 1333 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Slave).", |
3aa8d5f9 | 1334 | inet_ntoa(nbr->router_id)); |
718e3744 | 1335 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); |
8dd24ee6 PJ |
1336 | |
1337 | /* Reset I/MS */ | |
1338 | UNSET_FLAG (nbr->dd_flags, (OSPF_DD_FLAG_MS|OSPF_DD_FLAG_I)); | |
718e3744 | 1339 | } |
1340 | else | |
1341 | { | |
1342 | /* We're Master, ignore the initial DBD from Slave */ | |
6d45276f | 1343 | zlog_info ("Packet[DD]: Neighbor %s: Initial DBD from Slave, " |
3aa8d5f9 | 1344 | "ignoring.", inet_ntoa(nbr->router_id)); |
718e3744 | 1345 | break; |
1346 | } | |
1347 | } | |
1348 | /* Ack from the Slave */ | |
1349 | else if (!IS_SET_DD_MS (dd->flags) && !IS_SET_DD_I (dd->flags) && | |
1350 | ntohl (dd->dd_seqnum) == nbr->dd_seqnum && | |
68980084 | 1351 | IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) < 0) |
718e3744 | 1352 | { |
17eaa728 | 1353 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Master).", |
3aa8d5f9 | 1354 | inet_ntoa(nbr->router_id)); |
8dd24ee6 PJ |
1355 | /* Reset I, leaving MS */ |
1356 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_I); | |
718e3744 | 1357 | } |
1358 | else | |
1359 | { | |
3aa8d5f9 | 1360 | zlog_warn ("Packet[DD]: Neighbor %s Negotiation fails.", |
1361 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1362 | break; |
1363 | } | |
1364 | ||
1365 | /* This is where the real Options are saved */ | |
1366 | nbr->options = dd->options; | |
1367 | ||
68980084 | 1368 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1369 | { |
1370 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1371 | zlog_debug ("Neighbor[%s] is %sOpaque-capable.", |
718e3744 | 1372 | inet_ntoa (nbr->router_id), |
1373 | CHECK_FLAG (nbr->options, OSPF_OPTION_O) ? "" : "NOT "); | |
1374 | ||
1375 | if (! CHECK_FLAG (nbr->options, OSPF_OPTION_O) | |
1376 | && IPV4_ADDR_SAME (&DR (oi), &nbr->address.u.prefix4)) | |
1377 | { | |
6d45276f | 1378 | zlog_warn ("DR-neighbor[%s] is NOT opaque-capable; " |
1379 | "Opaque-LSAs cannot be reliably advertised " | |
1380 | "in this network.", | |
1381 | inet_ntoa (nbr->router_id)); | |
718e3744 | 1382 | /* This situation is undesirable, but not a real error. */ |
1383 | } | |
1384 | } | |
718e3744 | 1385 | |
1386 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_NegotiationDone); | |
1387 | ||
1388 | /* continue processing rest of packet. */ | |
1389 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1390 | break; | |
1391 | case NSM_Exchange: | |
1392 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1393 | { | |
1394 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1395 | /* Master: discard duplicated DD packet. */ | |
6d45276f | 1396 | zlog_info ("Packet[DD] (Master): Neighbor %s packet duplicated.", |
3aa8d5f9 | 1397 | inet_ntoa (nbr->router_id)); |
718e3744 | 1398 | else |
1399 | /* Slave: cause to retransmit the last Database Description. */ | |
1400 | { | |
6d45276f | 1401 | zlog_info ("Packet[DD] [Slave]: Neighbor %s packet duplicated.", |
3aa8d5f9 | 1402 | inet_ntoa (nbr->router_id)); |
718e3744 | 1403 | ospf_db_desc_resend (nbr); |
1404 | } | |
1405 | break; | |
1406 | } | |
1407 | ||
1408 | /* Otherwise DD packet should be checked. */ | |
1409 | /* Check Master/Slave bit mismatch */ | |
1410 | if (IS_SET_DD_MS (dd->flags) != IS_SET_DD_MS (nbr->last_recv.flags)) | |
1411 | { | |
3aa8d5f9 | 1412 | zlog_warn ("Packet[DD]: Neighbor %s MS-bit mismatch.", |
1413 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1414 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1415 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1416 | zlog_debug ("Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", |
3aa8d5f9 | 1417 | dd->flags, nbr->dd_flags); |
718e3744 | 1418 | break; |
1419 | } | |
1420 | ||
1421 | /* Check initialize bit is set. */ | |
1422 | if (IS_SET_DD_I (dd->flags)) | |
1423 | { | |
6d45276f | 1424 | zlog_info ("Packet[DD]: Neighbor %s I-bit set.", |
3aa8d5f9 | 1425 | inet_ntoa(nbr->router_id)); |
718e3744 | 1426 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1427 | break; | |
1428 | } | |
1429 | ||
1430 | /* Check DD Options. */ | |
1431 | if (dd->options != nbr->options) | |
1432 | { | |
1433 | #ifdef ORIGINAL_CODING | |
1434 | /* Save the new options for debugging */ | |
1435 | nbr->options = dd->options; | |
1436 | #endif /* ORIGINAL_CODING */ | |
3aa8d5f9 | 1437 | zlog_warn ("Packet[DD]: Neighbor %s options mismatch.", |
1438 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1439 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1440 | break; | |
1441 | } | |
1442 | ||
1443 | /* Check DD sequence number. */ | |
1444 | if ((IS_SET_DD_MS (nbr->dd_flags) && | |
1445 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum) || | |
1446 | (!IS_SET_DD_MS (nbr->dd_flags) && | |
1447 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum + 1)) | |
1448 | { | |
3aa8d5f9 | 1449 | zlog_warn ("Packet[DD]: Neighbor %s sequence number mismatch.", |
1450 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1451 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1452 | break; | |
1453 | } | |
1454 | ||
1455 | /* Continue processing rest of packet. */ | |
1456 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1457 | break; | |
1458 | case NSM_Loading: | |
1459 | case NSM_Full: | |
1460 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1461 | { | |
1462 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1463 | { | |
1464 | /* Master should discard duplicate DD packet. */ | |
6d45276f | 1465 | zlog_info ("Packet[DD]: Neighbor %s duplicated, " |
1466 | "packet discarded.", | |
3aa8d5f9 | 1467 | inet_ntoa(nbr->router_id)); |
718e3744 | 1468 | break; |
1469 | } | |
1470 | else | |
1471 | { | |
1472 | struct timeval t, now; | |
2518efd1 | 1473 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &now); |
718e3744 | 1474 | t = tv_sub (now, nbr->last_send_ts); |
1475 | if (tv_cmp (t, int2tv (nbr->v_inactivity)) < 0) | |
1476 | { | |
1477 | /* In states Loading and Full the slave must resend | |
1478 | its last Database Description packet in response to | |
1479 | duplicate Database Description packets received | |
1480 | from the master. For this reason the slave must | |
1481 | wait RouterDeadInterval seconds before freeing the | |
1482 | last Database Description packet. Reception of a | |
1483 | Database Description packet from the master after | |
1484 | this interval will generate a SeqNumberMismatch | |
1485 | neighbor event. RFC2328 Section 10.8 */ | |
1486 | ospf_db_desc_resend (nbr); | |
1487 | break; | |
1488 | } | |
1489 | } | |
1490 | } | |
1491 | ||
1492 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1493 | break; | |
1494 | default: | |
3aa8d5f9 | 1495 | zlog_warn ("Packet[DD]: Neighbor %s NSM illegal status %u.", |
1496 | inet_ntoa(nbr->router_id), nbr->state); | |
718e3744 | 1497 | break; |
1498 | } | |
1499 | } | |
1500 | ||
1501 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1502 | ||
1503 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
4dadc291 | 1504 | static void |
718e3744 | 1505 | ospf_ls_req (struct ip *iph, struct ospf_header *ospfh, |
1506 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1507 | { | |
1508 | struct ospf_neighbor *nbr; | |
1509 | u_int32_t ls_type; | |
1510 | struct in_addr ls_id; | |
1511 | struct in_addr adv_router; | |
1512 | struct ospf_lsa *find; | |
52dc7ee6 | 1513 | struct list *ls_upd; |
6c835671 | 1514 | unsigned int length; |
718e3744 | 1515 | |
1516 | /* Increment statistics. */ | |
1517 | oi->ls_req_in++; | |
1518 | ||
d3f0d621 | 1519 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1520 | if (nbr == NULL) |
1521 | { | |
1522 | zlog_warn ("Link State Request: Unknown Neighbor %s.", | |
1523 | inet_ntoa (ospfh->router_id)); | |
1524 | return; | |
1525 | } | |
1526 | ||
57c5c652 PJ |
1527 | /* Add event to thread. */ |
1528 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
1529 | ||
718e3744 | 1530 | /* Neighbor State should be Exchange or later. */ |
1531 | if (nbr->state != NSM_Exchange && | |
1532 | nbr->state != NSM_Loading && | |
1533 | nbr->state != NSM_Full) | |
1534 | { | |
bec595ad | 1535 | zlog_warn ("Link State Request received from %s: " |
1536 | "Neighbor state is %s, packet discarded.", | |
1537 | inet_ntoa (ospfh->router_id), | |
718e3744 | 1538 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1539 | return; | |
1540 | } | |
1541 | ||
1542 | /* Send Link State Update for ALL requested LSAs. */ | |
1543 | ls_upd = list_new (); | |
1544 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1545 | ||
1546 | while (size >= OSPF_LSA_KEY_SIZE) | |
1547 | { | |
1548 | /* Get one slice of Link State Request. */ | |
1549 | ls_type = stream_getl (s); | |
1550 | ls_id.s_addr = stream_get_ipv4 (s); | |
1551 | adv_router.s_addr = stream_get_ipv4 (s); | |
1552 | ||
1553 | /* Verify LSA type. */ | |
1554 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) | |
1555 | { | |
1556 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1557 | list_delete (ls_upd); | |
1558 | return; | |
1559 | } | |
1560 | ||
1561 | /* Search proper LSA in LSDB. */ | |
1562 | find = ospf_lsa_lookup (oi->area, ls_type, ls_id, adv_router); | |
1563 | if (find == NULL) | |
1564 | { | |
1565 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1566 | list_delete (ls_upd); | |
1567 | return; | |
1568 | } | |
1569 | ||
86f1fd96 | 1570 | /* Packet overflows MTU size, send immediately. */ |
1571 | if (length + ntohs (find->data->length) > ospf_packet_max (oi)) | |
718e3744 | 1572 | { |
1573 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1574 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1575 | else | |
1576 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1577 | ||
1578 | /* Only remove list contents. Keep ls_upd. */ | |
1579 | list_delete_all_node (ls_upd); | |
1580 | ||
1581 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1582 | } | |
1583 | ||
1584 | /* Append LSA to update list. */ | |
1585 | listnode_add (ls_upd, find); | |
1586 | length += ntohs (find->data->length); | |
1587 | ||
1588 | size -= OSPF_LSA_KEY_SIZE; | |
1589 | } | |
1590 | ||
1591 | /* Send rest of Link State Update. */ | |
1592 | if (listcount (ls_upd) > 0) | |
1593 | { | |
1594 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1595 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1596 | else | |
1597 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1598 | ||
1599 | list_delete (ls_upd); | |
1600 | } | |
1601 | else | |
1602 | list_free (ls_upd); | |
1603 | } | |
1604 | ||
1605 | /* Get the list of LSAs from Link State Update packet. | |
1606 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
52dc7ee6 | 1607 | static struct list * |
718e3744 | 1608 | ospf_ls_upd_list_lsa (struct ospf_neighbor *nbr, struct stream *s, |
1609 | struct ospf_interface *oi, size_t size) | |
1610 | { | |
1611 | u_int16_t count, sum; | |
1612 | u_int32_t length; | |
1613 | struct lsa_header *lsah; | |
1614 | struct ospf_lsa *lsa; | |
52dc7ee6 | 1615 | struct list *lsas; |
718e3744 | 1616 | |
1617 | lsas = list_new (); | |
1618 | ||
1619 | count = stream_getl (s); | |
1620 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1621 | ||
1622 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
9985f83c | 1623 | size -= length, stream_forward_getp (s, length), count--) |
718e3744 | 1624 | { |
1625 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
1626 | length = ntohs (lsah->length); | |
1627 | ||
1628 | if (length > size) | |
1629 | { | |
1630 | zlog_warn ("Link State Update: LSA length exceeds packet size."); | |
1631 | break; | |
1632 | } | |
1633 | ||
1634 | /* Validate the LSA's LS checksum. */ | |
1635 | sum = lsah->checksum; | |
d8a4e42b | 1636 | if (! ospf_lsa_checksum_valid (lsah)) |
718e3744 | 1637 | { |
223da1a9 JF |
1638 | /* (bug #685) more details in a one-line message make it possible |
1639 | * to identify problem source on the one hand and to have a better | |
1640 | * chance to compress repeated messages in syslog on the other */ | |
1641 | zlog_warn ("Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s", | |
1642 | sum, lsah->checksum, inet_ntoa (lsah->id), | |
1643 | inet_ntoa (nbr->src), inet_ntoa (nbr->router_id), | |
1644 | inet_ntoa (lsah->adv_router)); | |
718e3744 | 1645 | continue; |
1646 | } | |
1647 | ||
1648 | /* Examine the LSA's LS type. */ | |
1649 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
1650 | { | |
1651 | zlog_warn ("Link State Update: Unknown LS type %d", lsah->type); | |
1652 | continue; | |
1653 | } | |
1654 | ||
1655 | /* | |
1656 | * What if the received LSA's age is greater than MaxAge? | |
1657 | * Treat it as a MaxAge case -- endo. | |
1658 | */ | |
1659 | if (ntohs (lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1660 | lsah->ls_age = htons (OSPF_LSA_MAXAGE); | |
1661 | ||
718e3744 | 1662 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) |
1663 | { | |
1664 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1665 | if ((IS_OPAQUE_LSA(lsah->type) && | |
1666 | ! CHECK_FLAG (lsah->options, OSPF_OPTION_O)) | |
1667 | || (! IS_OPAQUE_LSA(lsah->type) && | |
1668 | CHECK_FLAG (lsah->options, OSPF_OPTION_O))) | |
1669 | { | |
1670 | /* | |
1671 | * This neighbor must know the exact usage of O-bit; | |
1672 | * the bit will be set in Type-9,10,11 LSAs only. | |
1673 | */ | |
1674 | zlog_warn ("LSA[Type%d:%s]: O-bit abuse?", lsah->type, inet_ntoa (lsah->id)); | |
1675 | continue; | |
1676 | } | |
1677 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
1678 | ||
1679 | /* Do not take in AS External Opaque-LSAs if we are a stub. */ | |
1680 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1681 | && nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1682 | { | |
1683 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1684 | zlog_debug ("LSA[Type%d:%s]: We are a stub, don't take this LSA.", lsah->type, inet_ntoa (lsah->id)); |
718e3744 | 1685 | continue; |
1686 | } | |
1687 | } | |
1688 | else if (IS_OPAQUE_LSA(lsah->type)) | |
1689 | { | |
1690 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1691 | continue; | |
1692 | } | |
718e3744 | 1693 | |
1694 | /* Create OSPF LSA instance. */ | |
1695 | lsa = ospf_lsa_new (); | |
1696 | ||
1697 | /* We may wish to put some error checking if type NSSA comes in | |
1698 | and area not in NSSA mode */ | |
1699 | switch (lsah->type) | |
1700 | { | |
1701 | case OSPF_AS_EXTERNAL_LSA: | |
718e3744 | 1702 | case OSPF_OPAQUE_AS_LSA: |
1703 | lsa->area = NULL; | |
1704 | break; | |
1705 | case OSPF_OPAQUE_LINK_LSA: | |
1706 | lsa->oi = oi; /* Remember incoming interface for flooding control. */ | |
1707 | /* Fallthrough */ | |
718e3744 | 1708 | default: |
1709 | lsa->area = oi->area; | |
1710 | break; | |
1711 | } | |
1712 | ||
1713 | lsa->data = ospf_lsa_data_new (length); | |
1714 | memcpy (lsa->data, lsah, length); | |
1715 | ||
1716 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1717 | zlog_debug("LSA[Type%d:%s]: %p new LSA created with Link State Update", |
6c4f4e6e | 1718 | lsa->data->type, inet_ntoa (lsa->data->id), (void *)lsa); |
718e3744 | 1719 | listnode_add (lsas, lsa); |
1720 | } | |
1721 | ||
1722 | return lsas; | |
1723 | } | |
1724 | ||
1725 | /* Cleanup Update list. */ | |
4dadc291 | 1726 | static void |
52dc7ee6 | 1727 | ospf_upd_list_clean (struct list *lsas) |
718e3744 | 1728 | { |
1eb8ef25 | 1729 | struct listnode *node, *nnode; |
718e3744 | 1730 | struct ospf_lsa *lsa; |
1731 | ||
1eb8ef25 | 1732 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
1733 | ospf_lsa_discard (lsa); | |
718e3744 | 1734 | |
1735 | list_delete (lsas); | |
1736 | } | |
1737 | ||
1738 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
4dadc291 | 1739 | static void |
ac7424f9 | 1740 | ospf_ls_upd (struct ospf *ospf, struct ip *iph, struct ospf_header *ospfh, |
718e3744 | 1741 | struct stream *s, struct ospf_interface *oi, u_int16_t size) |
1742 | { | |
1743 | struct ospf_neighbor *nbr; | |
52dc7ee6 | 1744 | struct list *lsas; |
1eb8ef25 | 1745 | struct listnode *node, *nnode; |
718e3744 | 1746 | struct ospf_lsa *lsa = NULL; |
1747 | /* unsigned long ls_req_found = 0; */ | |
1748 | ||
1749 | /* Dis-assemble the stream, update each entry, re-encapsulate for flooding */ | |
1750 | ||
1751 | /* Increment statistics. */ | |
1752 | oi->ls_upd_in++; | |
1753 | ||
1754 | /* Check neighbor. */ | |
d3f0d621 | 1755 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1756 | if (nbr == NULL) |
1757 | { | |
1758 | zlog_warn ("Link State Update: Unknown Neighbor %s on int: %s", | |
1759 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); | |
1760 | return; | |
1761 | } | |
1762 | ||
57c5c652 PJ |
1763 | /* Add event to thread. */ |
1764 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
1765 | ||
718e3744 | 1766 | /* Check neighbor state. */ |
1767 | if (nbr->state < NSM_Exchange) | |
1768 | { | |
a81bede2 DS |
1769 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) |
1770 | zlog_debug ("Link State Update: " | |
1771 | "Neighbor[%s] state %s is less than Exchange", | |
1772 | inet_ntoa (ospfh->router_id), | |
1773 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 1774 | return; |
1775 | } | |
1776 | ||
1777 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages | |
1778 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1779 | * of section 13. | |
1780 | */ | |
1781 | lsas = ospf_ls_upd_list_lsa (nbr, s, oi, size); | |
1782 | ||
718e3744 | 1783 | #define DISCARD_LSA(L,N) {\ |
1784 | if (IS_DEBUG_OSPF_EVENT) \ | |
6c4f4e6e DL |
1785 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \ |
1786 | " Type-%d", N, (void *)lsa, (int) lsa->data->type); \ | |
718e3744 | 1787 | ospf_lsa_discard (L); \ |
1788 | continue; } | |
1789 | ||
f92c57f8 AC |
1790 | /* Process each LSA received in the one packet. |
1791 | * | |
1792 | * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding | |
0798cee3 | 1793 | * text below are from the steps in RFC 2328, Section 13. |
f92c57f8 | 1794 | */ |
1eb8ef25 | 1795 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
718e3744 | 1796 | { |
1797 | struct ospf_lsa *ls_ret, *current; | |
1798 | int ret = 1; | |
1799 | ||
718e3744 | 1800 | if (IS_DEBUG_OSPF_NSSA) |
1801 | { | |
1802 | char buf1[INET_ADDRSTRLEN]; | |
1803 | char buf2[INET_ADDRSTRLEN]; | |
1804 | char buf3[INET_ADDRSTRLEN]; | |
1805 | ||
2a42e285 | 1806 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", |
718e3744 | 1807 | lsa->data->type, |
1808 | inet_ntop (AF_INET, &ospfh->router_id, | |
1809 | buf1, INET_ADDRSTRLEN), | |
1810 | inet_ntop (AF_INET, &lsa->data->id, | |
1811 | buf2, INET_ADDRSTRLEN), | |
1812 | inet_ntop (AF_INET, &lsa->data->adv_router, | |
1813 | buf3, INET_ADDRSTRLEN)); | |
1814 | } | |
718e3744 | 1815 | |
1816 | listnode_delete (lsas, lsa); /* We don't need it in list anymore */ | |
1817 | ||
f92c57f8 | 1818 | /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa() */ |
718e3744 | 1819 | |
f92c57f8 | 1820 | /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */ |
718e3744 | 1821 | |
f92c57f8 | 1822 | /* (3) Do not take in AS External LSAs if we are a stub or NSSA. */ |
718e3744 | 1823 | |
1824 | /* Do not take in AS NSSA if this neighbor and we are not NSSA */ | |
1825 | ||
1826 | /* Do take in Type-7's if we are an NSSA */ | |
1827 | ||
1828 | /* If we are also an ABR, later translate them to a Type-5 packet */ | |
1829 | ||
1830 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1831 | translate them to a separate Type-5 packet. */ | |
1832 | ||
1833 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1834 | /* Reject from STUB or NSSA */ | |
1835 | if (nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1836 | { | |
718e3744 | 1837 | if (IS_DEBUG_OSPF_NSSA) |
2a42e285 | 1838 | zlog_debug("Incoming External LSA Discarded: We are NSSA/STUB Area"); |
2cd754de | 1839 | DISCARD_LSA (lsa, 1); |
718e3744 | 1840 | } |
1841 | ||
718e3744 | 1842 | if (lsa->data->type == OSPF_AS_NSSA_LSA) |
1843 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) | |
1844 | { | |
718e3744 | 1845 | if (IS_DEBUG_OSPF_NSSA) |
2a42e285 | 1846 | zlog_debug("Incoming NSSA LSA Discarded: Not NSSA Area"); |
2cd754de | 1847 | DISCARD_LSA (lsa,2); |
718e3744 | 1848 | } |
718e3744 | 1849 | |
23cd8fb7 DL |
1850 | /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */ |
1851 | if (lsa->data->type == OSPF_ROUTER_LSA) | |
1852 | if (!IPV4_ADDR_SAME(&lsa->data->id, &lsa->data->adv_router)) | |
1853 | { | |
1854 | char buf1[INET_ADDRSTRLEN]; | |
1855 | char buf2[INET_ADDRSTRLEN]; | |
1856 | char buf3[INET_ADDRSTRLEN]; | |
1857 | ||
1858 | zlog_err("Incoming Router-LSA from %s with " | |
1859 | "Adv-ID[%s] != LS-ID[%s]", | |
1860 | inet_ntop (AF_INET, &ospfh->router_id, | |
1861 | buf1, INET_ADDRSTRLEN), | |
1862 | inet_ntop (AF_INET, &lsa->data->id, | |
1863 | buf2, INET_ADDRSTRLEN), | |
1864 | inet_ntop (AF_INET, &lsa->data->adv_router, | |
1865 | buf3, INET_ADDRSTRLEN)); | |
1866 | zlog_err("OSPF domain compromised by attack or corruption. " | |
1867 | "Verify correct operation of -ALL- OSPF routers."); | |
1868 | DISCARD_LSA (lsa, 0); | |
1869 | } | |
1870 | ||
718e3744 | 1871 | /* Find the LSA in the current database. */ |
1872 | ||
1873 | current = ospf_lsa_lookup_by_header (oi->area, lsa->data); | |
1874 | ||
f92c57f8 | 1875 | /* (4) If the LSA's LS age is equal to MaxAge, and there is currently |
718e3744 | 1876 | no instance of the LSA in the router's link state database, |
1877 | and none of router's neighbors are in states Exchange or Loading, | |
f92c57f8 | 1878 | then take the following actions: */ |
718e3744 | 1879 | |
1880 | if (IS_LSA_MAXAGE (lsa) && !current && | |
4c14b7f6 | 1881 | ospf_check_nbr_status(oi->ospf)) |
718e3744 | 1882 | { |
f92c57f8 | 1883 | /* (4a) Response Link State Acknowledgment. */ |
718e3744 | 1884 | ospf_ls_ack_send (nbr, lsa); |
1885 | ||
f92c57f8 | 1886 | /* (4b) Discard LSA. */ |
faf98758 AB |
1887 | if (IS_DEBUG_OSPF (lsa, LSA)) |
1888 | { | |
1889 | zlog_debug ("Link State Update[%s]: LS age is equal to MaxAge.", | |
1890 | dump_lsa_key(lsa)); | |
1891 | } | |
718e3744 | 1892 | DISCARD_LSA (lsa, 3); |
1893 | } | |
1894 | ||
718e3744 | 1895 | if (IS_OPAQUE_LSA (lsa->data->type) |
68980084 | 1896 | && IPV4_ADDR_SAME (&lsa->data->adv_router, &oi->ospf->router_id)) |
718e3744 | 1897 | { |
1898 | /* | |
1899 | * Even if initial flushing seems to be completed, there might | |
1900 | * be a case that self-originated LSA with MaxAge still remain | |
1901 | * in the routing domain. | |
1902 | * Just send an LSAck message to cease retransmission. | |
1903 | */ | |
1904 | if (IS_LSA_MAXAGE (lsa)) | |
1905 | { | |
1906 | zlog_warn ("LSA[%s]: Boomerang effect?", dump_lsa_key (lsa)); | |
1907 | ospf_ls_ack_send (nbr, lsa); | |
1908 | ospf_lsa_discard (lsa); | |
1909 | ||
1910 | if (current != NULL && ! IS_LSA_MAXAGE (current)) | |
1911 | ospf_opaque_lsa_refresh_schedule (current); | |
1912 | continue; | |
1913 | } | |
1914 | ||
1915 | /* | |
1916 | * If an instance of self-originated Opaque-LSA is not found | |
1917 | * in the LSDB, there are some possible cases here. | |
1918 | * | |
1919 | * 1) This node lost opaque-capability after restart. | |
1920 | * 2) Else, a part of opaque-type is no more supported. | |
1921 | * 3) Else, a part of opaque-id is no more supported. | |
1922 | * | |
1923 | * Anyway, it is still this node's responsibility to flush it. | |
1924 | * Otherwise, the LSA instance remains in the routing domain | |
1925 | * until its age reaches to MaxAge. | |
1926 | */ | |
69310a67 | 1927 | /* XXX: We should deal with this for *ALL* LSAs, not just opaque */ |
718e3744 | 1928 | if (current == NULL) |
1929 | { | |
1930 | if (IS_DEBUG_OSPF_EVENT) | |
69310a67 | 1931 | zlog_debug ("LSA[%s]: Previously originated Opaque-LSA," |
1932 | "not found in the LSDB.", dump_lsa_key (lsa)); | |
718e3744 | 1933 | |
1934 | SET_FLAG (lsa->flags, OSPF_LSA_SELF); | |
69310a67 | 1935 | |
1936 | ospf_opaque_self_originated_lsa_received (nbr, lsa); | |
1937 | ospf_ls_ack_send (nbr, lsa); | |
1938 | ||
718e3744 | 1939 | continue; |
1940 | } | |
1941 | } | |
69310a67 | 1942 | |
cb05eb28 | 1943 | /* It might be happen that received LSA is self-originated network LSA, but |
f92c57f8 | 1944 | * router ID is changed. So, we should check if LSA is a network-LSA whose |
cb05eb28 | 1945 | * Link State ID is one of the router's own IP interface addresses but whose |
1946 | * Advertising Router is not equal to the router's own Router ID | |
1947 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be flushed. | |
1948 | */ | |
1949 | ||
1950 | if(lsa->data->type == OSPF_NETWORK_LSA) | |
1951 | { | |
1eb8ef25 | 1952 | struct listnode *oinode, *oinnode; |
1953 | struct ospf_interface *out_if; | |
cb05eb28 | 1954 | int Flag = 0; |
1955 | ||
1eb8ef25 | 1956 | for (ALL_LIST_ELEMENTS (oi->ospf->oiflist, oinode, oinnode, out_if)) |
cb05eb28 | 1957 | { |
cb05eb28 | 1958 | if(out_if == NULL) |
1959 | break; | |
1960 | ||
1961 | if((IPV4_ADDR_SAME(&out_if->address->u.prefix4, &lsa->data->id)) && | |
1962 | (!(IPV4_ADDR_SAME(&oi->ospf->router_id, &lsa->data->adv_router)))) | |
1963 | { | |
1964 | if(out_if->network_lsa_self) | |
1965 | { | |
1966 | ospf_lsa_flush_area(lsa,out_if->area); | |
1967 | if(IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1968 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", |
6c4f4e6e | 1969 | (void *)lsa, (int) lsa->data->type); |
cb05eb28 | 1970 | ospf_lsa_discard (lsa); |
1971 | Flag = 1; | |
1972 | } | |
1973 | break; | |
1974 | } | |
1975 | } | |
1976 | if(Flag) | |
1977 | continue; | |
1978 | } | |
718e3744 | 1979 | |
1980 | /* (5) Find the instance of this LSA that is currently contained | |
1981 | in the router's link state database. If there is no | |
1982 | database copy, or the received LSA is more recent than | |
f92c57f8 AC |
1983 | the database copy the following steps must be performed. |
1984 | (The sub steps from RFC 2328 section 13 step (5) will be performed in | |
1985 | ospf_flood() ) */ | |
718e3744 | 1986 | |
1987 | if (current == NULL || | |
1988 | (ret = ospf_lsa_more_recent (current, lsa)) < 0) | |
1989 | { | |
1990 | /* Actual flooding procedure. */ | |
68980084 | 1991 | if (ospf_flood (oi->ospf, nbr, current, lsa) < 0) /* Trap NSSA later. */ |
718e3744 | 1992 | DISCARD_LSA (lsa, 4); |
1993 | continue; | |
1994 | } | |
1995 | ||
1996 | /* (6) Else, If there is an instance of the LSA on the sending | |
1997 | neighbor's Link state request list, an error has occurred in | |
1998 | the Database Exchange process. In this case, restart the | |
1999 | Database Exchange process by generating the neighbor event | |
2000 | BadLSReq for the sending neighbor and stop processing the | |
2001 | Link State Update packet. */ | |
2002 | ||
2003 | if (ospf_ls_request_lookup (nbr, lsa)) | |
2004 | { | |
2005 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
3aa8d5f9 | 2006 | zlog_warn("LSA[%s] instance exists on Link state request list", |
2007 | dump_lsa_key(lsa)); | |
718e3744 | 2008 | |
2009 | /* Clean list of LSAs. */ | |
2010 | ospf_upd_list_clean (lsas); | |
2011 | /* this lsa is not on lsas list already. */ | |
2012 | ospf_lsa_discard (lsa); | |
718e3744 | 2013 | return; |
2014 | } | |
2015 | ||
2016 | /* If the received LSA is the same instance as the database copy | |
2017 | (i.e., neither one is more recent) the following two steps | |
2018 | should be performed: */ | |
2019 | ||
2020 | if (ret == 0) | |
2021 | { | |
2022 | /* If the LSA is listed in the Link state retransmission list | |
2023 | for the receiving adjacency, the router itself is expecting | |
2024 | an acknowledgment for this LSA. The router should treat the | |
2025 | received LSA as an acknowledgment by removing the LSA from | |
2026 | the Link state retransmission list. This is termed an | |
2027 | "implied acknowledgment". */ | |
2028 | ||
2029 | ls_ret = ospf_ls_retransmit_lookup (nbr, lsa); | |
2030 | ||
2031 | if (ls_ret != NULL) | |
2032 | { | |
2033 | ospf_ls_retransmit_delete (nbr, ls_ret); | |
2034 | ||
2035 | /* Delayed acknowledgment sent if advertisement received | |
2036 | from Designated Router, otherwise do nothing. */ | |
2037 | if (oi->state == ISM_Backup) | |
2038 | if (NBR_IS_DR (nbr)) | |
2039 | listnode_add (oi->ls_ack, ospf_lsa_lock (lsa)); | |
2040 | ||
2041 | DISCARD_LSA (lsa, 5); | |
2042 | } | |
2043 | else | |
2044 | /* Acknowledge the receipt of the LSA by sending a | |
2045 | Link State Acknowledgment packet back out the receiving | |
2046 | interface. */ | |
2047 | { | |
2048 | ospf_ls_ack_send (nbr, lsa); | |
2049 | DISCARD_LSA (lsa, 6); | |
2050 | } | |
2051 | } | |
2052 | ||
2053 | /* The database copy is more recent. If the database copy | |
2054 | has LS age equal to MaxAge and LS sequence number equal to | |
2055 | MaxSequenceNumber, simply discard the received LSA without | |
2056 | acknowledging it. (In this case, the LSA's LS sequence number is | |
2057 | wrapping, and the MaxSequenceNumber LSA must be completely | |
2058 | flushed before any new LSA instance can be introduced). */ | |
2059 | ||
2060 | else if (ret > 0) /* Database copy is more recent */ | |
2061 | { | |
2062 | if (IS_LSA_MAXAGE (current) && | |
2063 | current->data->ls_seqnum == htonl (OSPF_MAX_SEQUENCE_NUMBER)) | |
2064 | { | |
2065 | DISCARD_LSA (lsa, 7); | |
2066 | } | |
2067 | /* Otherwise, as long as the database copy has not been sent in a | |
2068 | Link State Update within the last MinLSArrival seconds, send the | |
2069 | database copy back to the sending neighbor, encapsulated within | |
2070 | a Link State Update Packet. The Link State Update Packet should | |
2071 | be sent directly to the neighbor. In so doing, do not put the | |
2072 | database copy of the LSA on the neighbor's link state | |
2073 | retransmission list, and do not acknowledge the received (less | |
2074 | recent) LSA instance. */ | |
2075 | else | |
2076 | { | |
2077 | struct timeval now; | |
2078 | ||
2518efd1 | 2079 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &now); |
718e3744 | 2080 | |
2081 | if (tv_cmp (tv_sub (now, current->tv_orig), | |
16e56a14 | 2082 | msec2tv (ospf->min_ls_arrival)) >= 0) |
718e3744 | 2083 | /* Trap NSSA type later.*/ |
2084 | ospf_ls_upd_send_lsa (nbr, current, OSPF_SEND_PACKET_DIRECT); | |
2085 | DISCARD_LSA (lsa, 8); | |
2086 | } | |
2087 | } | |
2088 | } | |
2cd754de PJ |
2089 | #undef DISCARD_LSA |
2090 | ||
718e3744 | 2091 | assert (listcount (lsas) == 0); |
2092 | list_delete (lsas); | |
2093 | } | |
2094 | ||
2095 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
4dadc291 | 2096 | static void |
718e3744 | 2097 | ospf_ls_ack (struct ip *iph, struct ospf_header *ospfh, |
2098 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
2099 | { | |
2100 | struct ospf_neighbor *nbr; | |
69310a67 | 2101 | |
718e3744 | 2102 | /* increment statistics. */ |
2103 | oi->ls_ack_in++; | |
2104 | ||
d3f0d621 | 2105 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 2106 | if (nbr == NULL) |
2107 | { | |
2108 | zlog_warn ("Link State Acknowledgment: Unknown Neighbor %s.", | |
2109 | inet_ntoa (ospfh->router_id)); | |
2110 | return; | |
2111 | } | |
2112 | ||
57c5c652 PJ |
2113 | /* Add event to thread. */ |
2114 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
2115 | ||
718e3744 | 2116 | if (nbr->state < NSM_Exchange) |
2117 | { | |
a81bede2 DS |
2118 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) |
2119 | zlog_debug ("Link State Acknowledgment: " | |
2120 | "Neighbor[%s] state %s is less than Exchange", | |
2121 | inet_ntoa (ospfh->router_id), | |
2122 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 2123 | return; |
2124 | } | |
69310a67 | 2125 | |
718e3744 | 2126 | while (size >= OSPF_LSA_HEADER_SIZE) |
2127 | { | |
2128 | struct ospf_lsa *lsa, *lsr; | |
2129 | ||
2130 | lsa = ospf_lsa_new (); | |
2131 | lsa->data = (struct lsa_header *) STREAM_PNT (s); | |
2132 | ||
2133 | /* lsah = (struct lsa_header *) STREAM_PNT (s); */ | |
2134 | size -= OSPF_LSA_HEADER_SIZE; | |
9985f83c | 2135 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 2136 | |
2137 | if (lsa->data->type < OSPF_MIN_LSA || lsa->data->type >= OSPF_MAX_LSA) | |
2138 | { | |
2139 | lsa->data = NULL; | |
2140 | ospf_lsa_discard (lsa); | |
2141 | continue; | |
2142 | } | |
2143 | ||
2144 | lsr = ospf_ls_retransmit_lookup (nbr, lsa); | |
2145 | ||
49d7af11 | 2146 | if (lsr != NULL && ospf_lsa_more_recent (lsr, lsa) == 0) |
801e0e14 | 2147 | ospf_ls_retransmit_delete (nbr, lsr); |
718e3744 | 2148 | |
2149 | lsa->data = NULL; | |
2150 | ospf_lsa_discard (lsa); | |
2151 | } | |
2152 | ||
718e3744 | 2153 | return; |
718e3744 | 2154 | } |
6b0655a2 | 2155 | |
038163fa | 2156 | static struct stream * |
5c33349b | 2157 | ospf_recv_packet (int fd, struct interface **ifp, struct stream *ibuf) |
718e3744 | 2158 | { |
2159 | int ret; | |
5c33349b | 2160 | struct ip *iph; |
718e3744 | 2161 | u_int16_t ip_len; |
b892f1dd | 2162 | ifindex_t ifindex = 0; |
718e3744 | 2163 | struct iovec iov; |
d0deca68 | 2164 | /* Header and data both require alignment. */ |
e304982e | 2165 | char buff [CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; |
2dd8bb4e | 2166 | struct msghdr msgh; |
2167 | ||
68defd6d | 2168 | memset (&msgh, 0, sizeof (struct msghdr)); |
2dd8bb4e | 2169 | msgh.msg_iov = &iov; |
2170 | msgh.msg_iovlen = 1; | |
2171 | msgh.msg_control = (caddr_t) buff; | |
2172 | msgh.msg_controllen = sizeof (buff); | |
2dd8bb4e | 2173 | |
5c33349b | 2174 | ret = stream_recvmsg (ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE+1); |
2175 | if (ret < 0) | |
718e3744 | 2176 | { |
5c33349b | 2177 | zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno)); |
2178 | return NULL; | |
2179 | } | |
69310a67 | 2180 | if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */ |
5c33349b | 2181 | { |
2182 | zlog_warn("ospf_recv_packet: discarding runt packet of length %d " | |
2183 | "(ip header size is %u)", | |
2184 | ret, (u_int)sizeof(iph)); | |
718e3744 | 2185 | return NULL; |
2186 | } | |
18b12c38 | 2187 | |
5c33349b | 2188 | /* Note that there should not be alignment problems with this assignment |
2189 | because this is at the beginning of the stream data buffer. */ | |
2190 | iph = (struct ip *) STREAM_DATA(ibuf); | |
2191 | sockopt_iphdrincl_swab_systoh (iph); | |
18b12c38 | 2192 | |
5c33349b | 2193 | ip_len = iph->ip_len; |
6b333611 | 2194 | |
de5ccb96 | 2195 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000) |
718e3744 | 2196 | /* |
2197 | * Kernel network code touches incoming IP header parameters, | |
2198 | * before protocol specific processing. | |
2199 | * | |
2200 | * 1) Convert byteorder to host representation. | |
2201 | * --> ip_len, ip_id, ip_off | |
2202 | * | |
2203 | * 2) Adjust ip_len to strip IP header size! | |
2204 | * --> If user process receives entire IP packet via RAW | |
2205 | * socket, it must consider adding IP header size to | |
2206 | * the "ip_len" field of "ip" structure. | |
2207 | * | |
2208 | * For more details, see <netinet/ip_input.c>. | |
2209 | */ | |
5c33349b | 2210 | ip_len = ip_len + (iph->ip_hl << 2); |
718e3744 | 2211 | #endif |
2212 | ||
0150c9c9 DB |
2213 | #if defined(__DragonFly__) |
2214 | /* | |
2215 | * in DragonFly's raw socket, ip_len/ip_off are read | |
2216 | * in network byte order. | |
2217 | * As OpenBSD < 200311 adjust ip_len to strip IP header size! | |
2218 | */ | |
2219 | ip_len = ntohs(iph->ip_len) + (iph->ip_hl << 2); | |
2220 | #endif | |
2221 | ||
863082d5 | 2222 | ifindex = getsockopt_ifindex (AF_INET, &msgh); |
718e3744 | 2223 | |
2224 | *ifp = if_lookup_by_index (ifindex); | |
2225 | ||
2226 | if (ret != ip_len) | |
2227 | { | |
5c33349b | 2228 | zlog_warn ("ospf_recv_packet read length mismatch: ip_len is %d, " |
2229 | "but recvmsg returned %d", ip_len, ret); | |
718e3744 | 2230 | return NULL; |
2231 | } | |
2232 | ||
2233 | return ibuf; | |
2234 | } | |
2235 | ||
4dadc291 | 2236 | static struct ospf_interface * |
d3f0d621 | 2237 | ospf_associate_packet_vl (struct ospf *ospf, struct interface *ifp, |
718e3744 | 2238 | struct ip *iph, struct ospf_header *ospfh) |
2239 | { | |
2240 | struct ospf_interface *rcv_oi; | |
718e3744 | 2241 | struct ospf_vl_data *vl_data; |
2242 | struct ospf_area *vl_area; | |
52dc7ee6 | 2243 | struct listnode *node; |
718e3744 | 2244 | |
2245 | if (IN_MULTICAST (ntohl (iph->ip_dst.s_addr)) || | |
2246 | !OSPF_IS_AREA_BACKBONE (ospfh)) | |
d3f0d621 | 2247 | return NULL; |
718e3744 | 2248 | |
d3f0d621 | 2249 | /* look for local OSPF interface matching the destination |
2250 | * to determine Area ID. We presume therefore the destination address | |
2251 | * is unique, or at least (for "unnumbered" links), not used in other | |
2252 | * areas | |
2253 | */ | |
2254 | if ((rcv_oi = ospf_if_lookup_by_local_addr (ospf, NULL, | |
2255 | iph->ip_dst)) == NULL) | |
2256 | return NULL; | |
718e3744 | 2257 | |
1eb8ef25 | 2258 | for (ALL_LIST_ELEMENTS_RO (ospf->vlinks, node, vl_data)) |
718e3744 | 2259 | { |
020709f9 | 2260 | vl_area = ospf_area_lookup_by_area_id (ospf, vl_data->vl_area_id); |
718e3744 | 2261 | if (!vl_area) |
2262 | continue; | |
2263 | ||
2264 | if (OSPF_AREA_SAME (&vl_area, &rcv_oi->area) && | |
2265 | IPV4_ADDR_SAME (&vl_data->vl_peer, &ospfh->router_id)) | |
2266 | { | |
2267 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2268 | zlog_debug ("associating packet with %s", |
718e3744 | 2269 | IF_NAME (vl_data->vl_oi)); |
2270 | if (! CHECK_FLAG (vl_data->vl_oi->ifp->flags, IFF_UP)) | |
2271 | { | |
2272 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2273 | zlog_debug ("This VL is not up yet, sorry"); |
718e3744 | 2274 | return NULL; |
2275 | } | |
2276 | ||
2277 | return vl_data->vl_oi; | |
2278 | } | |
2279 | } | |
2280 | ||
2281 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2282 | zlog_debug ("couldn't find any VL to associate the packet with"); |
718e3744 | 2283 | |
d3f0d621 | 2284 | return NULL; |
718e3744 | 2285 | } |
2286 | ||
f63f06da | 2287 | static int |
718e3744 | 2288 | ospf_check_area_id (struct ospf_interface *oi, struct ospf_header *ospfh) |
2289 | { | |
2290 | /* Check match the Area ID of the receiving interface. */ | |
2291 | if (OSPF_AREA_SAME (&oi->area, &ospfh)) | |
2292 | return 1; | |
2293 | ||
2294 | return 0; | |
2295 | } | |
2296 | ||
2297 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2298 | To prevent it, compare src IP address and i/f address with masking | |
2299 | i/f network mask. */ | |
4dadc291 | 2300 | static int |
718e3744 | 2301 | ospf_check_network_mask (struct ospf_interface *oi, struct in_addr ip_src) |
2302 | { | |
2303 | struct in_addr mask, me, him; | |
2304 | ||
2305 | if (oi->type == OSPF_IFTYPE_POINTOPOINT || | |
2306 | oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2307 | return 1; | |
2308 | ||
2309 | masklen2ip (oi->address->prefixlen, &mask); | |
2310 | ||
2311 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
2312 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
2313 | ||
2314 | if (IPV4_ADDR_SAME (&me, &him)) | |
2315 | return 1; | |
2316 | ||
2317 | return 0; | |
2318 | } | |
2319 | ||
bd5651f0 DO |
2320 | /* Return 1, if the packet is properly authenticated and checksummed, |
2321 | 0 otherwise. In particular, check that AuType header field is valid and | |
2322 | matches the locally configured AuType, and that D.5 requirements are met. */ | |
4dadc291 | 2323 | static int |
e5259148 | 2324 | ospf_check_auth (struct ospf_interface *oi, struct ospf_header *ospfh) |
718e3744 | 2325 | { |
718e3744 | 2326 | struct crypt_key *ck; |
bd5651f0 DO |
2327 | u_int16_t iface_auth_type; |
2328 | u_int16_t pkt_auth_type = ntohs (ospfh->auth_type); | |
718e3744 | 2329 | |
bd5651f0 DO |
2330 | switch (pkt_auth_type) |
2331 | { | |
2332 | case OSPF_AUTH_NULL: /* RFC2328 D.5.1 */ | |
2333 | if (OSPF_AUTH_NULL != (iface_auth_type = ospf_auth_type (oi))) | |
718e3744 | 2334 | { |
bd5651f0 DO |
2335 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2336 | zlog_warn ("interface %s: auth-type mismatch, local %s, rcvd Null", | |
2337 | IF_NAME (oi), LOOKUP (ospf_auth_type_str, iface_auth_type)); | |
2338 | return 0; | |
718e3744 | 2339 | } |
bd5651f0 DO |
2340 | if (! ospf_check_sum (ospfh)) |
2341 | { | |
2342 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2343 | zlog_warn ("interface %s: Null auth OK, but checksum error, Router-ID %s", | |
2344 | IF_NAME (oi), inet_ntoa (ospfh->router_id)); | |
2345 | return 0; | |
2346 | } | |
2347 | return 1; | |
2348 | case OSPF_AUTH_SIMPLE: /* RFC2328 D.5.2 */ | |
2349 | if (OSPF_AUTH_SIMPLE != (iface_auth_type = ospf_auth_type (oi))) | |
2350 | { | |
2351 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2352 | zlog_warn ("interface %s: auth-type mismatch, local %s, rcvd Simple", | |
2353 | IF_NAME (oi), LOOKUP (ospf_auth_type_str, iface_auth_type)); | |
2354 | return 0; | |
2355 | } | |
2356 | if (memcmp (OSPF_IF_PARAM (oi, auth_simple), ospfh->u.auth_data, OSPF_AUTH_SIMPLE_SIZE)) | |
2357 | { | |
2358 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2359 | zlog_warn ("interface %s: Simple auth failed", IF_NAME (oi)); | |
2360 | return 0; | |
2361 | } | |
2362 | if (! ospf_check_sum (ospfh)) | |
2363 | { | |
2364 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2365 | zlog_warn ("interface %s: Simple auth OK, checksum error, Router-ID %s", | |
2366 | IF_NAME (oi), inet_ntoa (ospfh->router_id)); | |
2367 | return 0; | |
2368 | } | |
2369 | return 1; | |
2370 | case OSPF_AUTH_CRYPTOGRAPHIC: /* RFC2328 D.5.3 */ | |
2371 | if (OSPF_AUTH_CRYPTOGRAPHIC != (iface_auth_type = ospf_auth_type (oi))) | |
2372 | { | |
2373 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2374 | zlog_warn ("interface %s: auth-type mismatch, local %s, rcvd Cryptographic", | |
2375 | IF_NAME (oi), LOOKUP (ospf_auth_type_str, iface_auth_type)); | |
2376 | return 0; | |
2377 | } | |
2378 | if (ospfh->checksum) | |
2379 | { | |
2380 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2381 | zlog_warn ("interface %s: OSPF header checksum is not 0", IF_NAME (oi)); | |
2382 | return 0; | |
2383 | } | |
2384 | /* only MD5 crypto method can pass ospf_packet_examin() */ | |
2385 | if | |
2386 | ( | |
2387 | NULL == (ck = listgetdata (listtail(OSPF_IF_PARAM (oi,auth_crypt)))) || | |
2388 | ospfh->u.crypt.key_id != ck->key_id || | |
2389 | /* Condition above uses the last key ID on the list, which is | |
2390 | different from what ospf_crypt_key_lookup() does. A bug? */ | |
2391 | ! ospf_check_md5_digest (oi, ospfh) | |
2392 | ) | |
2393 | { | |
2394 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2395 | zlog_warn ("interface %s: MD5 auth failed", IF_NAME (oi)); | |
2396 | return 0; | |
2397 | } | |
2398 | return 1; | |
2399 | default: | |
2400 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2401 | zlog_warn ("interface %s: invalid packet auth-type (%02x)", | |
2402 | IF_NAME (oi), pkt_auth_type); | |
2403 | return 0; | |
2404 | } | |
718e3744 | 2405 | } |
2406 | ||
4dadc291 | 2407 | static int |
718e3744 | 2408 | ospf_check_sum (struct ospf_header *ospfh) |
2409 | { | |
2410 | u_int32_t ret; | |
2411 | u_int16_t sum; | |
718e3744 | 2412 | |
2413 | /* clear auth_data for checksum. */ | |
2414 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2415 | ||
2416 | /* keep checksum and clear. */ | |
2417 | sum = ospfh->checksum; | |
2418 | memset (&ospfh->checksum, 0, sizeof (u_int16_t)); | |
2419 | ||
2420 | /* calculate checksum. */ | |
2421 | ret = in_cksum (ospfh, ntohs (ospfh->length)); | |
2422 | ||
2423 | if (ret != sum) | |
2424 | { | |
2425 | zlog_info ("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2426 | ret, sum); | |
2427 | return 0; | |
2428 | } | |
2429 | ||
2430 | return 1; | |
2431 | } | |
2432 | ||
4e31de79 DO |
2433 | /* Verify, that given link/TOS records are properly sized/aligned and match |
2434 | Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */ | |
2435 | static unsigned | |
2436 | ospf_router_lsa_links_examin | |
2437 | ( | |
2438 | struct router_lsa_link * link, | |
2439 | u_int16_t linkbytes, | |
2440 | const u_int16_t num_links | |
2441 | ) | |
2442 | { | |
2443 | unsigned counted_links = 0, thislinklen; | |
2444 | ||
2445 | while (linkbytes) | |
2446 | { | |
2447 | thislinklen = OSPF_ROUTER_LSA_LINK_SIZE + 4 * link->m[0].tos_count; | |
2448 | if (thislinklen > linkbytes) | |
2449 | { | |
2450 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2451 | zlog_debug ("%s: length error in link block #%u", __func__, counted_links); | |
2452 | return MSG_NG; | |
2453 | } | |
2454 | link = (struct router_lsa_link *)((caddr_t) link + thislinklen); | |
2455 | linkbytes -= thislinklen; | |
2456 | counted_links++; | |
2457 | } | |
2458 | if (counted_links != num_links) | |
2459 | { | |
2460 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2461 | zlog_debug ("%s: %u link blocks declared, %u present", | |
2462 | __func__, num_links, counted_links); | |
2463 | return MSG_NG; | |
2464 | } | |
2465 | return MSG_OK; | |
2466 | } | |
2467 | ||
2468 | /* Verify, that the given LSA is properly sized/aligned (including type-specific | |
2469 | minimum length constraint). */ | |
2470 | static unsigned | |
2471 | ospf_lsa_examin (struct lsa_header * lsah, const u_int16_t lsalen, const u_char headeronly) | |
2472 | { | |
2473 | unsigned ret; | |
2474 | struct router_lsa * rlsa; | |
2475 | if | |
2476 | ( | |
2477 | lsah->type < OSPF_MAX_LSA && | |
2478 | ospf_lsa_minlen[lsah->type] && | |
2479 | lsalen < OSPF_LSA_HEADER_SIZE + ospf_lsa_minlen[lsah->type] | |
2480 | ) | |
2481 | { | |
2482 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2483 | zlog_debug ("%s: undersized (%u B) %s", | |
2484 | __func__, lsalen, LOOKUP (ospf_lsa_type_msg, lsah->type)); | |
2485 | return MSG_NG; | |
2486 | } | |
2487 | switch (lsah->type) | |
2488 | { | |
2489 | case OSPF_ROUTER_LSA: | |
2490 | /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1 (12+)-byte link blocks */ | |
2491 | if (headeronly) | |
2492 | { | |
2493 | ret = (lsalen - OSPF_LSA_HEADER_SIZE - OSPF_ROUTER_LSA_MIN_SIZE) % 4 ? MSG_NG : MSG_OK; | |
2494 | break; | |
2495 | } | |
2496 | rlsa = (struct router_lsa *) lsah; | |
2497 | ret = ospf_router_lsa_links_examin | |
2498 | ( | |
2499 | (struct router_lsa_link *) rlsa->link, | |
2500 | lsalen - OSPF_LSA_HEADER_SIZE - 4, /* skip: basic header, "flags", 0, "# links" */ | |
2501 | ntohs (rlsa->links) /* 16 bits */ | |
2502 | ); | |
2503 | break; | |
2504 | case OSPF_AS_EXTERNAL_LSA: | |
2505 | /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long blocks */ | |
2506 | case OSPF_AS_NSSA_LSA: | |
2507 | /* RFC3101 C, idem */ | |
2508 | ret = (lsalen - OSPF_LSA_HEADER_SIZE - OSPF_AS_EXTERNAL_LSA_MIN_SIZE) % 12 ? MSG_NG : MSG_OK; | |
2509 | break; | |
2510 | /* Following LSA types are considered OK length-wise as soon as their minimum | |
2511 | * length constraint is met and length of the whole LSA is a multiple of 4 | |
2512 | * (basic LSA header size is already a multiple of 4). */ | |
2513 | case OSPF_NETWORK_LSA: | |
2514 | /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */ | |
2515 | case OSPF_SUMMARY_LSA: | |
2516 | case OSPF_ASBR_SUMMARY_LSA: | |
2517 | /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS blocks */ | |
4e31de79 DO |
2518 | case OSPF_OPAQUE_LINK_LSA: |
2519 | case OSPF_OPAQUE_AREA_LSA: | |
2520 | case OSPF_OPAQUE_AS_LSA: | |
2521 | /* RFC5250 A.2, "some number of octets (of application-specific | |
2522 | * data) padded to 32-bit alignment." This is considered equivalent | |
2523 | * to 4-byte alignment of all other LSA types, see OSPF-ALIGNMENT.txt | |
2524 | * file for the detailed analysis of this passage. */ | |
4e31de79 DO |
2525 | ret = lsalen % 4 ? MSG_NG : MSG_OK; |
2526 | break; | |
2527 | default: | |
2528 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2529 | zlog_debug ("%s: unsupported LSA type 0x%02x", __func__, lsah->type); | |
2530 | return MSG_NG; | |
2531 | } | |
2532 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2533 | zlog_debug ("%s: alignment error in %s", | |
2534 | __func__, LOOKUP (ospf_lsa_type_msg, lsah->type)); | |
2535 | return ret; | |
2536 | } | |
2537 | ||
2538 | /* Verify if the provided input buffer is a valid sequence of LSAs. This | |
2539 | includes verification of LSA blocks length/alignment and dispatching | |
2540 | of deeper-level checks. */ | |
2541 | static unsigned | |
2542 | ospf_lsaseq_examin | |
2543 | ( | |
2544 | struct lsa_header *lsah, /* start of buffered data */ | |
2545 | size_t length, | |
2546 | const u_char headeronly, | |
2547 | /* When declared_num_lsas is not 0, compare it to the real number of LSAs | |
2548 | and treat the difference as an error. */ | |
2549 | const u_int32_t declared_num_lsas | |
2550 | ) | |
2551 | { | |
2552 | u_int32_t counted_lsas = 0; | |
2553 | ||
2554 | while (length) | |
2555 | { | |
2556 | u_int16_t lsalen; | |
2557 | if (length < OSPF_LSA_HEADER_SIZE) | |
2558 | { | |
2559 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2560 | zlog_debug ("%s: undersized (%zu B) trailing (#%u) LSA header", | |
2561 | __func__, length, counted_lsas); | |
2562 | return MSG_NG; | |
2563 | } | |
2564 | /* save on ntohs() calls here and in the LSA validator */ | |
2565 | lsalen = ntohs (lsah->length); | |
2566 | if (lsalen < OSPF_LSA_HEADER_SIZE) | |
2567 | { | |
2568 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2569 | zlog_debug ("%s: malformed LSA header #%u, declared length is %u B", | |
2570 | __func__, counted_lsas, lsalen); | |
2571 | return MSG_NG; | |
2572 | } | |
2573 | if (headeronly) | |
2574 | { | |
2575 | /* less checks here and in ospf_lsa_examin() */ | |
2576 | if (MSG_OK != ospf_lsa_examin (lsah, lsalen, 1)) | |
2577 | { | |
2578 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2579 | zlog_debug ("%s: malformed header-only LSA #%u", __func__, counted_lsas); | |
2580 | return MSG_NG; | |
2581 | } | |
2582 | lsah = (struct lsa_header *) ((caddr_t) lsah + OSPF_LSA_HEADER_SIZE); | |
2583 | length -= OSPF_LSA_HEADER_SIZE; | |
2584 | } | |
2585 | else | |
2586 | { | |
2587 | /* make sure the input buffer is deep enough before further checks */ | |
2588 | if (lsalen > length) | |
2589 | { | |
2590 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2591 | zlog_debug ("%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B", | |
2592 | __func__, counted_lsas, lsalen, length); | |
2593 | return MSG_NG; | |
2594 | } | |
2595 | if (MSG_OK != ospf_lsa_examin (lsah, lsalen, 0)) | |
2596 | { | |
2597 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2598 | zlog_debug ("%s: malformed LSA #%u", __func__, counted_lsas); | |
2599 | return MSG_NG; | |
2600 | } | |
2601 | lsah = (struct lsa_header *) ((caddr_t) lsah + lsalen); | |
2602 | length -= lsalen; | |
2603 | } | |
2604 | counted_lsas++; | |
2605 | } | |
2606 | ||
2607 | if (declared_num_lsas && counted_lsas != declared_num_lsas) | |
2608 | { | |
2609 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2610 | zlog_debug ("%s: #LSAs declared (%u) does not match actual (%u)", | |
2611 | __func__, declared_num_lsas, counted_lsas); | |
2612 | return MSG_NG; | |
2613 | } | |
2614 | return MSG_OK; | |
2615 | } | |
2616 | ||
75c8eabb DO |
2617 | /* Verify a complete OSPF packet for proper sizing/alignment. */ |
2618 | static unsigned | |
2619 | ospf_packet_examin (struct ospf_header * oh, const unsigned bytesonwire) | |
2620 | { | |
bd5651f0 | 2621 | u_int16_t bytesdeclared, bytesauth; |
4e31de79 DO |
2622 | unsigned ret; |
2623 | struct ospf_ls_update * lsupd; | |
75c8eabb DO |
2624 | |
2625 | /* Length, 1st approximation. */ | |
2626 | if (bytesonwire < OSPF_HEADER_SIZE) | |
2627 | { | |
2628 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2629 | zlog_debug ("%s: undersized (%u B) packet", __func__, bytesonwire); | |
2630 | return MSG_NG; | |
2631 | } | |
2632 | /* Now it is safe to access header fields. Performing length check, allow | |
2633 | * for possible extra bytes of crypto auth/padding, which are not counted | |
2634 | * in the OSPF header "length" field. */ | |
aee56745 DO |
2635 | if (oh->version != OSPF_VERSION) |
2636 | { | |
2637 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2638 | zlog_debug ("%s: invalid (%u) protocol version", __func__, oh->version); | |
2639 | return MSG_NG; | |
2640 | } | |
75c8eabb | 2641 | bytesdeclared = ntohs (oh->length); |
bd5651f0 DO |
2642 | if (ntohs (oh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) |
2643 | bytesauth = 0; | |
2644 | else | |
2645 | { | |
2646 | if (oh->u.crypt.auth_data_len != OSPF_AUTH_MD5_SIZE) | |
2647 | { | |
2648 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2649 | zlog_debug ("%s: unsupported crypto auth length (%u B)", | |
2650 | __func__, oh->u.crypt.auth_data_len); | |
2651 | return MSG_NG; | |
2652 | } | |
2653 | bytesauth = OSPF_AUTH_MD5_SIZE; | |
2654 | } | |
2655 | if (bytesdeclared + bytesauth > bytesonwire) | |
75c8eabb DO |
2656 | { |
2657 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
bd5651f0 DO |
2658 | zlog_debug ("%s: packet length error (%u real, %u+%u declared)", |
2659 | __func__, bytesonwire, bytesdeclared, bytesauth); | |
75c8eabb DO |
2660 | return MSG_NG; |
2661 | } | |
2662 | /* Length, 2nd approximation. The type-specific constraint is checked | |
2663 | against declared length, not amount of bytes on wire. */ | |
2664 | if | |
2665 | ( | |
2666 | oh->type >= OSPF_MSG_HELLO && | |
2667 | oh->type <= OSPF_MSG_LS_ACK && | |
2668 | bytesdeclared < OSPF_HEADER_SIZE + ospf_packet_minlen[oh->type] | |
2669 | ) | |
2670 | { | |
2671 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2672 | zlog_debug ("%s: undersized (%u B) %s packet", __func__, | |
2673 | bytesdeclared, LOOKUP (ospf_packet_type_str, oh->type)); | |
2674 | return MSG_NG; | |
2675 | } | |
4e31de79 DO |
2676 | switch (oh->type) |
2677 | { | |
2678 | case OSPF_MSG_HELLO: | |
2679 | /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes followed | |
2680 | by N>=0 router-IDs. */ | |
b29adf9c | 2681 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_HELLO_MIN_SIZE) % 4 ? MSG_NG : MSG_OK; |
4e31de79 DO |
2682 | break; |
2683 | case OSPF_MSG_DB_DESC: | |
2684 | /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes followed | |
2685 | by N>=0 header-only LSAs. */ | |
2686 | ret = ospf_lsaseq_examin | |
2687 | ( | |
2688 | (struct lsa_header *) ((caddr_t) oh + OSPF_HEADER_SIZE + OSPF_DB_DESC_MIN_SIZE), | |
b29adf9c | 2689 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_DB_DESC_MIN_SIZE, |
4e31de79 DO |
2690 | 1, /* header-only LSAs */ |
2691 | 0 | |
2692 | ); | |
2693 | break; | |
2694 | case OSPF_MSG_LS_REQ: | |
2695 | /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes request blocks. */ | |
b29adf9c | 2696 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_REQ_MIN_SIZE) % |
4e31de79 DO |
2697 | OSPF_LSA_KEY_SIZE ? MSG_NG : MSG_OK; |
2698 | break; | |
2699 | case OSPF_MSG_LS_UPD: | |
2700 | /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes followed | |
2701 | by N>=0 full LSAs (with N declared beforehand). */ | |
2702 | lsupd = (struct ospf_ls_update *) ((caddr_t) oh + OSPF_HEADER_SIZE); | |
2703 | ret = ospf_lsaseq_examin | |
2704 | ( | |
2705 | (struct lsa_header *) ((caddr_t) lsupd + OSPF_LS_UPD_MIN_SIZE), | |
b29adf9c | 2706 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_UPD_MIN_SIZE, |
4e31de79 DO |
2707 | 0, /* full LSAs */ |
2708 | ntohl (lsupd->num_lsas) /* 32 bits */ | |
2709 | ); | |
2710 | break; | |
2711 | case OSPF_MSG_LS_ACK: | |
2712 | /* RFC2328 A.3.6, packet header followed by N>=0 header-only LSAs. */ | |
2713 | ret = ospf_lsaseq_examin | |
2714 | ( | |
2715 | (struct lsa_header *) ((caddr_t) oh + OSPF_HEADER_SIZE + OSPF_LS_ACK_MIN_SIZE), | |
b29adf9c | 2716 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_ACK_MIN_SIZE, |
4e31de79 DO |
2717 | 1, /* header-only LSAs */ |
2718 | 0 | |
2719 | ); | |
2720 | break; | |
2721 | default: | |
2722 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2723 | zlog_debug ("%s: invalid packet type 0x%02x", __func__, oh->type); | |
2724 | return MSG_NG; | |
2725 | } | |
2726 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2727 | zlog_debug ("%s: malformed %s packet", __func__, LOOKUP (ospf_packet_type_str, oh->type)); | |
2728 | return ret; | |
75c8eabb DO |
2729 | } |
2730 | ||
718e3744 | 2731 | /* OSPF Header verification. */ |
4dadc291 | 2732 | static int |
718e3744 | 2733 | ospf_verify_header (struct stream *ibuf, struct ospf_interface *oi, |
2734 | struct ip *iph, struct ospf_header *ospfh) | |
2735 | { | |
718e3744 | 2736 | /* Check Area ID. */ |
2737 | if (!ospf_check_area_id (oi, ospfh)) | |
2738 | { | |
2739 | zlog_warn ("interface %s: ospf_read invalid Area ID %s.", | |
2740 | IF_NAME (oi), inet_ntoa (ospfh->area_id)); | |
2741 | return -1; | |
2742 | } | |
2743 | ||
2744 | /* Check network mask, Silently discarded. */ | |
2745 | if (! ospf_check_network_mask (oi, iph->ip_src)) | |
2746 | { | |
2747 | zlog_warn ("interface %s: ospf_read network address is not same [%s]", | |
2748 | IF_NAME (oi), inet_ntoa (iph->ip_src)); | |
2749 | return -1; | |
2750 | } | |
2751 | ||
bd5651f0 | 2752 | /* Check authentication. The function handles logging actions, where required. */ |
e5259148 | 2753 | if (! ospf_check_auth (oi, ospfh)) |
bd5651f0 | 2754 | return -1; |
718e3744 | 2755 | |
2756 | return 0; | |
2757 | } | |
2758 | ||
2759 | /* Starting point of packet process function. */ | |
2760 | int | |
2761 | ospf_read (struct thread *thread) | |
2762 | { | |
2763 | int ret; | |
2764 | struct stream *ibuf; | |
68980084 | 2765 | struct ospf *ospf; |
718e3744 | 2766 | struct ospf_interface *oi; |
2767 | struct ip *iph; | |
2768 | struct ospf_header *ospfh; | |
2769 | u_int16_t length; | |
2770 | struct interface *ifp; | |
b10ce841 | 2771 | struct connected *c; |
718e3744 | 2772 | |
2773 | /* first of all get interface pointer. */ | |
68980084 | 2774 | ospf = THREAD_ARG (thread); |
038163fa | 2775 | |
2776 | /* prepare for next packet. */ | |
2777 | ospf->t_read = thread_add_read (master, ospf_read, ospf, ospf->fd); | |
718e3744 | 2778 | |
5c33349b | 2779 | stream_reset(ospf->ibuf); |
2780 | if (!(ibuf = ospf_recv_packet (ospf->fd, &ifp, ospf->ibuf))) | |
718e3744 | 2781 | return -1; |
75c8eabb | 2782 | /* This raw packet is known to be at least as big as its IP header. */ |
718e3744 | 2783 | |
5c33349b | 2784 | /* Note that there should not be alignment problems with this assignment |
2785 | because this is at the beginning of the stream data buffer. */ | |
06f953f7 | 2786 | iph = (struct ip *) STREAM_DATA (ibuf); |
5c33349b | 2787 | /* Note that sockopt_iphdrincl_swab_systoh was called in ospf_recv_packet. */ |
06f953f7 | 2788 | |
ac191232 | 2789 | if (ifp == NULL) |
b10ce841 RW |
2790 | { |
2791 | /* Handle cases where the platform does not support retrieving the ifindex, | |
2792 | and also platforms (such as Solaris 8) that claim to support ifindex | |
2793 | retrieval but do not. */ | |
2794 | c = if_lookup_address ((void *)&iph->ip_src, AF_INET); | |
2795 | if (c) | |
2796 | ifp = c->ifp; | |
2797 | if (ifp == NULL) | |
2798 | return 0; | |
2799 | } | |
718e3744 | 2800 | |
2801 | /* IP Header dump. */ | |
17b78d38 | 2802 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) |
6b333611 | 2803 | ospf_ip_header_dump (iph); |
7d95c611 | 2804 | |
718e3744 | 2805 | /* Self-originated packet should be discarded silently. */ |
68980084 | 2806 | if (ospf_if_lookup_by_local_addr (ospf, NULL, iph->ip_src)) |
718e3744 | 2807 | { |
d324181c | 2808 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) |
2809 | { | |
2a42e285 | 2810 | zlog_debug ("ospf_read[%s]: Dropping self-originated packet", |
d324181c | 2811 | inet_ntoa (iph->ip_src)); |
2812 | } | |
718e3744 | 2813 | return 0; |
2814 | } | |
2815 | ||
61ab0301 DO |
2816 | /* Advance from IP header to OSPF header (iph->ip_hl has been verified |
2817 | by ospf_recv_packet() to be correct). */ | |
9985f83c | 2818 | stream_forward_getp (ibuf, iph->ip_hl * 4); |
61ab0301 | 2819 | |
75c8eabb DO |
2820 | ospfh = (struct ospf_header *) STREAM_PNT (ibuf); |
2821 | if (MSG_OK != ospf_packet_examin (ospfh, stream_get_endp (ibuf) - stream_get_getp (ibuf))) | |
61ab0301 | 2822 | return -1; |
61ab0301 | 2823 | /* Now it is safe to access all fields of OSPF packet header. */ |
718e3744 | 2824 | |
2825 | /* associate packet with ospf interface */ | |
05cf46ba | 2826 | oi = ospf_if_lookup_recv_if (ospf, iph->ip_src, ifp); |
d3f0d621 | 2827 | |
3aad46bd YS |
2828 | /* ospf_verify_header() relies on a valid "oi" and thus can be called only |
2829 | after the passive/backbone/other checks below are passed. These checks | |
2830 | in turn access the fields of unverified "ospfh" structure for their own | |
2831 | purposes and must remain very accurate in doing this. */ | |
71775043 | 2832 | |
491eddc2 JT |
2833 | /* If incoming interface is passive one, ignore it. */ |
2834 | if (oi && OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) | |
2835 | { | |
2836 | char buf[3][INET_ADDRSTRLEN]; | |
2837 | ||
2838 | if (IS_DEBUG_OSPF_EVENT) | |
2839 | zlog_debug ("ignoring packet from router %s sent to %s, " | |
2840 | "received on a passive interface, %s", | |
2841 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], sizeof(buf[0])), | |
2842 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2843 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
2844 | buf[2], sizeof(buf[2]))); | |
2845 | ||
2846 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
2847 | { | |
2848 | /* Try to fix multicast membership. | |
2849 | * Some OS:es may have problems in this area, | |
2850 | * make sure it is removed. | |
2851 | */ | |
2852 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
2853 | ospf_if_set_multicast(oi); | |
2854 | } | |
2855 | return 0; | |
2856 | } | |
2857 | ||
2858 | ||
d3f0d621 | 2859 | /* if no local ospf_interface, |
2860 | * or header area is backbone but ospf_interface is not | |
2861 | * check for VLINK interface | |
2862 | */ | |
2863 | if ( (oi == NULL) || | |
2864 | (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) | |
2865 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id)) | |
2866 | ) | |
718e3744 | 2867 | { |
d3f0d621 | 2868 | if ((oi = ospf_associate_packet_vl (ospf, ifp, iph, ospfh)) == NULL) |
d324181c | 2869 | { |
7c8ff89e | 2870 | if (!ospf->instance && IS_DEBUG_OSPF_EVENT) |
88871b1d PJ |
2871 | zlog_debug ("Packet from [%s] received on link %s" |
2872 | " but no ospf_interface", | |
2873 | inet_ntoa (iph->ip_src), ifp->name); | |
d3f0d621 | 2874 | return 0; |
d324181c | 2875 | } |
d3f0d621 | 2876 | } |
05cf46ba | 2877 | |
d3f0d621 | 2878 | /* else it must be a local ospf interface, check it was received on |
2879 | * correct link | |
2880 | */ | |
2881 | else if (oi->ifp != ifp) | |
2882 | { | |
11637435 PJ |
2883 | if (IS_DEBUG_OSPF_EVENT) |
2884 | zlog_warn ("Packet from [%s] received on wrong link %s", | |
2885 | inet_ntoa (iph->ip_src), ifp->name); | |
718e3744 | 2886 | return 0; |
2887 | } | |
847947f2 | 2888 | else if (oi->state == ISM_Down) |
c3eab871 | 2889 | { |
ba6454ec | 2890 | char buf[2][INET_ADDRSTRLEN]; |
2891 | zlog_warn ("Ignoring packet from %s to %s received on interface that is " | |
847947f2 | 2892 | "down [%s]; interface flags are %s", |
ba6454ec | 2893 | inet_ntop(AF_INET, &iph->ip_src, buf[0], sizeof(buf[0])), |
2894 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2895 | ifp->name, if_flag_dump(ifp->flags)); | |
ba6454ec | 2896 | /* Fix multicast memberships? */ |
2897 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
429ac78c | 2898 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); |
ba6454ec | 2899 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) |
429ac78c | 2900 | OI_MEMBER_JOINED(oi, MEMBER_DROUTERS); |
ba6454ec | 2901 | if (oi->multicast_memberships) |
2902 | ospf_if_set_multicast(oi); | |
c3eab871 | 2903 | return 0; |
2904 | } | |
718e3744 | 2905 | |
2906 | /* | |
2907 | * If the received packet is destined for AllDRouters, the packet | |
2908 | * should be accepted only if the received ospf interface state is | |
2909 | * either DR or Backup -- endo. | |
2910 | */ | |
2911 | if (iph->ip_dst.s_addr == htonl (OSPF_ALLDROUTERS) | |
2912 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) | |
2913 | { | |
ba6454ec | 2914 | zlog_warn ("Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", |
718e3744 | 2915 | inet_ntoa (iph->ip_src), IF_NAME (oi), |
2916 | LOOKUP (ospf_ism_state_msg, oi->state)); | |
ba6454ec | 2917 | /* Try to fix multicast membership. */ |
2918 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
2919 | ospf_if_set_multicast(oi); | |
718e3744 | 2920 | return 0; |
2921 | } | |
2922 | ||
3aad46bd YS |
2923 | /* Verify more OSPF header fields. */ |
2924 | ret = ospf_verify_header (ibuf, oi, iph, ospfh); | |
2925 | if (ret < 0) | |
2926 | { | |
2927 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2928 | zlog_debug ("ospf_read[%s]: Header check failed, " | |
2929 | "dropping.", | |
2930 | inet_ntoa (iph->ip_src)); | |
2931 | return ret; | |
2932 | } | |
2933 | ||
718e3744 | 2934 | /* Show debug receiving packet. */ |
1aa7b399 | 2935 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2936 | { | |
718e3744 | 2937 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) |
1aa7b399 | 2938 | { |
2a42e285 | 2939 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2940 | ospf_packet_dump (ibuf); |
2941 | } | |
718e3744 | 2942 | |
2a42e285 | 2943 | zlog_debug ("%s received from [%s] via [%s]", |
272ca1e3 | 2944 | LOOKUP (ospf_packet_type_str, ospfh->type), |
1aa7b399 | 2945 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); |
2a42e285 | 2946 | zlog_debug (" src [%s],", inet_ntoa (iph->ip_src)); |
2947 | zlog_debug (" dst [%s]", inet_ntoa (iph->ip_dst)); | |
718e3744 | 2948 | |
2949 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) | |
2a42e285 | 2950 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2951 | } |
718e3744 | 2952 | |
9985f83c | 2953 | stream_forward_getp (ibuf, OSPF_HEADER_SIZE); |
718e3744 | 2954 | |
2955 | /* Adjust size to message length. */ | |
2956 | length = ntohs (ospfh->length) - OSPF_HEADER_SIZE; | |
2957 | ||
2958 | /* Read rest of the packet and call each sort of packet routine. */ | |
2959 | switch (ospfh->type) | |
2960 | { | |
2961 | case OSPF_MSG_HELLO: | |
2962 | ospf_hello (iph, ospfh, ibuf, oi, length); | |
2963 | break; | |
2964 | case OSPF_MSG_DB_DESC: | |
2965 | ospf_db_desc (iph, ospfh, ibuf, oi, length); | |
2966 | break; | |
2967 | case OSPF_MSG_LS_REQ: | |
2968 | ospf_ls_req (iph, ospfh, ibuf, oi, length); | |
2969 | break; | |
2970 | case OSPF_MSG_LS_UPD: | |
ac7424f9 | 2971 | ospf_ls_upd (ospf, iph, ospfh, ibuf, oi, length); |
718e3744 | 2972 | break; |
2973 | case OSPF_MSG_LS_ACK: | |
2974 | ospf_ls_ack (iph, ospfh, ibuf, oi, length); | |
2975 | break; | |
2976 | default: | |
2977 | zlog (NULL, LOG_WARNING, | |
2978 | "interface %s: OSPF packet header type %d is illegal", | |
2979 | IF_NAME (oi), ospfh->type); | |
2980 | break; | |
2981 | } | |
2982 | ||
718e3744 | 2983 | return 0; |
2984 | } | |
2985 | ||
2986 | /* Make OSPF header. */ | |
4dadc291 | 2987 | static void |
718e3744 | 2988 | ospf_make_header (int type, struct ospf_interface *oi, struct stream *s) |
2989 | { | |
2990 | struct ospf_header *ospfh; | |
2991 | ||
2992 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
2993 | ||
2994 | ospfh->version = (u_char) OSPF_VERSION; | |
2995 | ospfh->type = (u_char) type; | |
2996 | ||
68980084 | 2997 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 2998 | |
2999 | ospfh->checksum = 0; | |
3000 | ospfh->area_id = oi->area->area_id; | |
3001 | ospfh->auth_type = htons (ospf_auth_type (oi)); | |
3002 | ||
3003 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
3004 | ||
9985f83c | 3005 | stream_forward_endp (s, OSPF_HEADER_SIZE); |
718e3744 | 3006 | } |
3007 | ||
3008 | /* Make Authentication Data. */ | |
4dadc291 | 3009 | static int |
718e3744 | 3010 | ospf_make_auth (struct ospf_interface *oi, struct ospf_header *ospfh) |
3011 | { | |
3012 | struct crypt_key *ck; | |
3013 | ||
3014 | switch (ospf_auth_type (oi)) | |
3015 | { | |
3016 | case OSPF_AUTH_NULL: | |
3017 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
3018 | break; | |
3019 | case OSPF_AUTH_SIMPLE: | |
3020 | memcpy (ospfh->u.auth_data, OSPF_IF_PARAM (oi, auth_simple), | |
3021 | OSPF_AUTH_SIMPLE_SIZE); | |
3022 | break; | |
3023 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
3024 | /* If key is not set, then set 0. */ | |
3025 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
3026 | { | |
3027 | ospfh->u.crypt.zero = 0; | |
3028 | ospfh->u.crypt.key_id = 0; | |
3029 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3030 | } | |
3031 | else | |
3032 | { | |
1eb8ef25 | 3033 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
718e3744 | 3034 | ospfh->u.crypt.zero = 0; |
3035 | ospfh->u.crypt.key_id = ck->key_id; | |
3036 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3037 | } | |
3038 | /* note: the seq is done in ospf_make_md5_digest() */ | |
3039 | break; | |
3040 | default: | |
3041 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
3042 | break; | |
3043 | } | |
3044 | ||
3045 | return 0; | |
3046 | } | |
3047 | ||
3048 | /* Fill rest of OSPF header. */ | |
4dadc291 | 3049 | static void |
718e3744 | 3050 | ospf_fill_header (struct ospf_interface *oi, |
3051 | struct stream *s, u_int16_t length) | |
3052 | { | |
3053 | struct ospf_header *ospfh; | |
3054 | ||
3055 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
3056 | ||
3057 | /* Fill length. */ | |
3058 | ospfh->length = htons (length); | |
3059 | ||
3060 | /* Calculate checksum. */ | |
3061 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
3062 | ospfh->checksum = in_cksum (ospfh, length); | |
3063 | else | |
3064 | ospfh->checksum = 0; | |
3065 | ||
3066 | /* Add Authentication Data. */ | |
3067 | ospf_make_auth (oi, ospfh); | |
3068 | } | |
3069 | ||
4dadc291 | 3070 | static int |
718e3744 | 3071 | ospf_make_hello (struct ospf_interface *oi, struct stream *s) |
3072 | { | |
3073 | struct ospf_neighbor *nbr; | |
3074 | struct route_node *rn; | |
3075 | u_int16_t length = OSPF_HELLO_MIN_SIZE; | |
3076 | struct in_addr mask; | |
3077 | unsigned long p; | |
3078 | int flag = 0; | |
3079 | ||
3080 | /* Set netmask of interface. */ | |
b2f4a395 DS |
3081 | if (!(CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED) && |
3082 | oi->type == OSPF_IFTYPE_POINTOPOINT) && | |
718e3744 | 3083 | oi->type != OSPF_IFTYPE_VIRTUALLINK) |
3084 | masklen2ip (oi->address->prefixlen, &mask); | |
3085 | else | |
3086 | memset ((char *) &mask, 0, sizeof (struct in_addr)); | |
3087 | stream_put_ipv4 (s, mask.s_addr); | |
3088 | ||
3089 | /* Set Hello Interval. */ | |
f9ad937f | 3090 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) |
3091 | stream_putw (s, OSPF_IF_PARAM (oi, v_hello)); | |
3092 | else | |
3093 | stream_putw (s, 0); /* hello-interval of 0 for fast-hellos */ | |
718e3744 | 3094 | |
3095 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3096 | zlog_debug ("make_hello: options: %x, int: %s", |
718e3744 | 3097 | OPTIONS(oi), IF_NAME (oi)); |
3098 | ||
3099 | /* Set Options. */ | |
3100 | stream_putc (s, OPTIONS (oi)); | |
3101 | ||
3102 | /* Set Router Priority. */ | |
3103 | stream_putc (s, PRIORITY (oi)); | |
3104 | ||
3105 | /* Set Router Dead Interval. */ | |
3106 | stream_putl (s, OSPF_IF_PARAM (oi, v_wait)); | |
3107 | ||
3108 | /* Set Designated Router. */ | |
3109 | stream_put_ipv4 (s, DR (oi).s_addr); | |
3110 | ||
9985f83c | 3111 | p = stream_get_endp (s); |
718e3744 | 3112 | |
3113 | /* Set Backup Designated Router. */ | |
3114 | stream_put_ipv4 (s, BDR (oi).s_addr); | |
3115 | ||
3116 | /* Add neighbor seen. */ | |
3117 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
68980084 | 3118 | if ((nbr = rn->info)) |
3119 | if (nbr->router_id.s_addr != 0) /* Ignore 0.0.0.0 node. */ | |
3120 | if (nbr->state != NSM_Attempt) /* Ignore Down neighbor. */ | |
3121 | if (nbr->state != NSM_Down) /* This is myself for DR election. */ | |
3122 | if (!IPV4_ADDR_SAME (&nbr->router_id, &oi->ospf->router_id)) | |
718e3744 | 3123 | { |
3124 | /* Check neighbor is sane? */ | |
68980084 | 3125 | if (nbr->d_router.s_addr != 0 |
3126 | && IPV4_ADDR_SAME (&nbr->d_router, &oi->address->u.prefix4) | |
3127 | && IPV4_ADDR_SAME (&nbr->bd_router, &oi->address->u.prefix4)) | |
3128 | flag = 1; | |
718e3744 | 3129 | |
3130 | stream_put_ipv4 (s, nbr->router_id.s_addr); | |
3131 | length += 4; | |
3132 | } | |
3133 | ||
3134 | /* Let neighbor generate BackupSeen. */ | |
3135 | if (flag == 1) | |
3a9eb091 | 3136 | stream_putl_at (s, p, 0); /* ipv4 address, normally */ |
718e3744 | 3137 | |
3138 | return length; | |
3139 | } | |
3140 | ||
4dadc291 | 3141 | static int |
718e3744 | 3142 | ospf_make_db_desc (struct ospf_interface *oi, struct ospf_neighbor *nbr, |
3143 | struct stream *s) | |
3144 | { | |
3145 | struct ospf_lsa *lsa; | |
3146 | u_int16_t length = OSPF_DB_DESC_MIN_SIZE; | |
3147 | u_char options; | |
3148 | unsigned long pp; | |
3149 | int i; | |
3150 | struct ospf_lsdb *lsdb; | |
3151 | ||
3152 | /* Set Interface MTU. */ | |
3153 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3154 | stream_putw (s, 0); | |
3155 | else | |
3156 | stream_putw (s, oi->ifp->mtu); | |
3157 | ||
3158 | /* Set Options. */ | |
3159 | options = OPTIONS (oi); | |
68980084 | 3160 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
ec0ae370 | 3161 | SET_FLAG (options, OSPF_OPTION_O); |
718e3744 | 3162 | stream_putc (s, options); |
3163 | ||
8dd24ee6 | 3164 | /* DD flags */ |
9985f83c | 3165 | pp = stream_get_endp (s); |
718e3744 | 3166 | stream_putc (s, nbr->dd_flags); |
3167 | ||
3168 | /* Set DD Sequence Number. */ | |
3169 | stream_putl (s, nbr->dd_seqnum); | |
3170 | ||
b5aeb441 | 3171 | /* shortcut unneeded walk of (empty) summary LSDBs */ |
718e3744 | 3172 | if (ospf_db_summary_isempty (nbr)) |
b5aeb441 | 3173 | goto empty; |
718e3744 | 3174 | |
3175 | /* Describe LSA Header from Database Summary List. */ | |
3176 | lsdb = &nbr->db_sum; | |
3177 | ||
3178 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
3179 | { | |
3180 | struct route_table *table = lsdb->type[i].db; | |
3181 | struct route_node *rn; | |
3182 | ||
3183 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
3184 | if ((lsa = rn->info) != NULL) | |
3185 | { | |
718e3744 | 3186 | if (IS_OPAQUE_LSA (lsa->data->type) |
3187 | && (! CHECK_FLAG (options, OSPF_OPTION_O))) | |
3188 | { | |
3189 | /* Suppress advertising opaque-informations. */ | |
3190 | /* Remove LSA from DB summary list. */ | |
3191 | ospf_lsdb_delete (lsdb, lsa); | |
3192 | continue; | |
3193 | } | |
718e3744 | 3194 | |
3195 | if (!CHECK_FLAG (lsa->flags, OSPF_LSA_DISCARD)) | |
3196 | { | |
3197 | struct lsa_header *lsah; | |
3198 | u_int16_t ls_age; | |
3199 | ||
3200 | /* DD packet overflows interface MTU. */ | |
86f1fd96 | 3201 | if (length + OSPF_LSA_HEADER_SIZE > ospf_packet_max (oi)) |
718e3744 | 3202 | break; |
3203 | ||
3204 | /* Keep pointer to LS age. */ | |
3205 | lsah = (struct lsa_header *) (STREAM_DATA (s) + | |
9985f83c | 3206 | stream_get_endp (s)); |
718e3744 | 3207 | |
3208 | /* Proceed stream pointer. */ | |
3209 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
3210 | length += OSPF_LSA_HEADER_SIZE; | |
3211 | ||
3212 | /* Set LS age. */ | |
3213 | ls_age = LS_AGE (lsa); | |
3214 | lsah->ls_age = htons (ls_age); | |
3215 | ||
3216 | } | |
3217 | ||
3218 | /* Remove LSA from DB summary list. */ | |
3219 | ospf_lsdb_delete (lsdb, lsa); | |
3220 | } | |
3221 | } | |
3222 | ||
8dd24ee6 PJ |
3223 | /* Update 'More' bit */ |
3224 | if (ospf_db_summary_isempty (nbr)) | |
3225 | { | |
b5aeb441 PJ |
3226 | empty: |
3227 | if (nbr->state >= NSM_Exchange) | |
3228 | { | |
3229 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_M); | |
3230 | /* Rewrite DD flags */ | |
3231 | stream_putc_at (s, pp, nbr->dd_flags); | |
3232 | } | |
3233 | else | |
3234 | { | |
3235 | assert (IS_SET_DD_M(nbr->dd_flags)); | |
3236 | } | |
8dd24ee6 | 3237 | } |
718e3744 | 3238 | return length; |
3239 | } | |
3240 | ||
4dadc291 | 3241 | static int |
718e3744 | 3242 | ospf_make_ls_req_func (struct stream *s, u_int16_t *length, |
3243 | unsigned long delta, struct ospf_neighbor *nbr, | |
3244 | struct ospf_lsa *lsa) | |
3245 | { | |
3246 | struct ospf_interface *oi; | |
3247 | ||
3248 | oi = nbr->oi; | |
3249 | ||
3250 | /* LS Request packet overflows interface MTU. */ | |
86f1fd96 | 3251 | if (*length + delta > ospf_packet_max(oi)) |
718e3744 | 3252 | return 0; |
3253 | ||
3254 | stream_putl (s, lsa->data->type); | |
3255 | stream_put_ipv4 (s, lsa->data->id.s_addr); | |
3256 | stream_put_ipv4 (s, lsa->data->adv_router.s_addr); | |
3257 | ||
1fe6ed38 | 3258 | ospf_lsa_unlock (&nbr->ls_req_last); |
718e3744 | 3259 | nbr->ls_req_last = ospf_lsa_lock (lsa); |
3260 | ||
3261 | *length += 12; | |
3262 | return 1; | |
3263 | } | |
3264 | ||
4dadc291 | 3265 | static int |
718e3744 | 3266 | ospf_make_ls_req (struct ospf_neighbor *nbr, struct stream *s) |
3267 | { | |
3268 | struct ospf_lsa *lsa; | |
3269 | u_int16_t length = OSPF_LS_REQ_MIN_SIZE; | |
9985f83c | 3270 | unsigned long delta = stream_get_endp(s)+12; |
718e3744 | 3271 | struct route_table *table; |
3272 | struct route_node *rn; | |
3273 | int i; | |
3274 | struct ospf_lsdb *lsdb; | |
3275 | ||
3276 | lsdb = &nbr->ls_req; | |
3277 | ||
3278 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
3279 | { | |
3280 | table = lsdb->type[i].db; | |
3281 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
3282 | if ((lsa = (rn->info)) != NULL) | |
3283 | if (ospf_make_ls_req_func (s, &length, delta, nbr, lsa) == 0) | |
3284 | { | |
3285 | route_unlock_node (rn); | |
3286 | break; | |
3287 | } | |
3288 | } | |
3289 | return length; | |
3290 | } | |
3291 | ||
4dadc291 | 3292 | static int |
718e3744 | 3293 | ls_age_increment (struct ospf_lsa *lsa, int delay) |
3294 | { | |
3295 | int age; | |
3296 | ||
3297 | age = IS_LSA_MAXAGE (lsa) ? OSPF_LSA_MAXAGE : LS_AGE (lsa) + delay; | |
3298 | ||
3299 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); | |
3300 | } | |
3301 | ||
4dadc291 | 3302 | static int |
52dc7ee6 | 3303 | ospf_make_ls_upd (struct ospf_interface *oi, struct list *update, struct stream *s) |
718e3744 | 3304 | { |
3305 | struct ospf_lsa *lsa; | |
52dc7ee6 | 3306 | struct listnode *node; |
c9035ccd | 3307 | u_int16_t length = 0; |
86f1fd96 | 3308 | unsigned int size_noauth; |
9985f83c | 3309 | unsigned long delta = stream_get_endp (s); |
718e3744 | 3310 | unsigned long pp; |
3311 | int count = 0; | |
3312 | ||
3313 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3314 | zlog_debug ("ospf_make_ls_upd: Start"); |
59ea14c6 | 3315 | |
9985f83c | 3316 | pp = stream_get_endp (s); |
3317 | stream_forward_endp (s, OSPF_LS_UPD_MIN_SIZE); | |
c9035ccd | 3318 | length += OSPF_LS_UPD_MIN_SIZE; |
718e3744 | 3319 | |
86f1fd96 | 3320 | /* Calculate amount of packet usable for data. */ |
3321 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
3322 | ||
718e3744 | 3323 | while ((node = listhead (update)) != NULL) |
3324 | { | |
3325 | struct lsa_header *lsah; | |
3326 | u_int16_t ls_age; | |
3327 | ||
3328 | if (IS_DEBUG_OSPF_EVENT) | |
d06ccd47 | 3329 | zlog_debug ("ospf_make_ls_upd: List Iteration %d", count); |
718e3744 | 3330 | |
1eb8ef25 | 3331 | lsa = listgetdata (node); |
3332 | ||
718e3744 | 3333 | assert (lsa->data); |
3334 | ||
68b7339a | 3335 | /* Will it fit? */ |
86f1fd96 | 3336 | if (length + delta + ntohs (lsa->data->length) > size_noauth) |
59ea14c6 | 3337 | break; |
3338 | ||
718e3744 | 3339 | /* Keep pointer to LS age. */ |
9985f83c | 3340 | lsah = (struct lsa_header *) (STREAM_DATA (s) + stream_get_endp (s)); |
718e3744 | 3341 | |
3342 | /* Put LSA to Link State Request. */ | |
3343 | stream_put (s, lsa->data, ntohs (lsa->data->length)); | |
3344 | ||
3345 | /* Set LS age. */ | |
3346 | /* each hop must increment an lsa_age by transmit_delay | |
3347 | of OSPF interface */ | |
3348 | ls_age = ls_age_increment (lsa, OSPF_IF_PARAM (oi, transmit_delay)); | |
3349 | lsah->ls_age = htons (ls_age); | |
3350 | ||
3351 | length += ntohs (lsa->data->length); | |
3352 | count++; | |
3353 | ||
3354 | list_delete_node (update, node); | |
1fe6ed38 | 3355 | ospf_lsa_unlock (&lsa); /* oi->ls_upd_queue */ |
718e3744 | 3356 | } |
3357 | ||
3358 | /* Now set #LSAs. */ | |
3a9eb091 | 3359 | stream_putl_at (s, pp, count); |
718e3744 | 3360 | |
3361 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3362 | zlog_debug ("ospf_make_ls_upd: Stop"); |
718e3744 | 3363 | return length; |
3364 | } | |
3365 | ||
4dadc291 | 3366 | static int |
52dc7ee6 | 3367 | ospf_make_ls_ack (struct ospf_interface *oi, struct list *ack, struct stream *s) |
718e3744 | 3368 | { |
1fe6ed38 | 3369 | struct listnode *node, *nnode; |
718e3744 | 3370 | u_int16_t length = OSPF_LS_ACK_MIN_SIZE; |
9985f83c | 3371 | unsigned long delta = stream_get_endp(s) + 24; |
718e3744 | 3372 | struct ospf_lsa *lsa; |
3373 | ||
1fe6ed38 | 3374 | for (ALL_LIST_ELEMENTS (ack, node, nnode, lsa)) |
718e3744 | 3375 | { |
718e3744 | 3376 | assert (lsa); |
3377 | ||
86f1fd96 | 3378 | if (length + delta > ospf_packet_max (oi)) |
718e3744 | 3379 | break; |
3380 | ||
3381 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
3382 | length += OSPF_LSA_HEADER_SIZE; | |
3383 | ||
718e3744 | 3384 | listnode_delete (ack, lsa); |
1fe6ed38 | 3385 | ospf_lsa_unlock (&lsa); /* oi->ls_ack_direct.ls_ack */ |
718e3744 | 3386 | } |
3387 | ||
718e3744 | 3388 | return length; |
3389 | } | |
3390 | ||
aa276fd7 PJ |
3391 | static void |
3392 | ospf_hello_send_sub (struct ospf_interface *oi, in_addr_t addr) | |
718e3744 | 3393 | { |
3394 | struct ospf_packet *op; | |
3395 | u_int16_t length = OSPF_HEADER_SIZE; | |
3396 | ||
3397 | op = ospf_packet_new (oi->ifp->mtu); | |
3398 | ||
3399 | /* Prepare OSPF common header. */ | |
3400 | ospf_make_header (OSPF_MSG_HELLO, oi, op->s); | |
3401 | ||
3402 | /* Prepare OSPF Hello body. */ | |
3403 | length += ospf_make_hello (oi, op->s); | |
3404 | ||
3405 | /* Fill OSPF header. */ | |
3406 | ospf_fill_header (oi, op->s, length); | |
3407 | ||
3408 | /* Set packet length. */ | |
3409 | op->length = length; | |
3410 | ||
aa276fd7 | 3411 | op->dst.s_addr = addr; |
718e3744 | 3412 | |
aa276fd7 PJ |
3413 | /* Add packet to the top of the interface output queue, so that they |
3414 | * can't get delayed by things like long queues of LS Update packets | |
3415 | */ | |
3416 | ospf_packet_add_top (oi, op); | |
718e3744 | 3417 | |
3418 | /* Hook thread to write packet. */ | |
020709f9 | 3419 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3420 | } |
3421 | ||
4dadc291 | 3422 | static void |
718e3744 | 3423 | ospf_poll_send (struct ospf_nbr_nbma *nbr_nbma) |
3424 | { | |
3425 | struct ospf_interface *oi; | |
3426 | ||
3427 | oi = nbr_nbma->oi; | |
3428 | assert(oi); | |
3429 | ||
3430 | /* If this is passive interface, do not send OSPF Hello. */ | |
7ffa8fa2 | 3431 | if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) |
718e3744 | 3432 | return; |
3433 | ||
3434 | if (oi->type != OSPF_IFTYPE_NBMA) | |
3435 | return; | |
3436 | ||
3437 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) | |
3438 | return; | |
3439 | ||
3440 | if (PRIORITY(oi) == 0) | |
3441 | return; | |
3442 | ||
3443 | if (nbr_nbma->priority == 0 | |
3444 | && oi->state != ISM_DR && oi->state != ISM_Backup) | |
3445 | return; | |
3446 | ||
aa276fd7 | 3447 | ospf_hello_send_sub (oi, nbr_nbma->addr.s_addr); |
718e3744 | 3448 | } |
3449 | ||
3450 | int | |
3451 | ospf_poll_timer (struct thread *thread) | |
3452 | { | |
3453 | struct ospf_nbr_nbma *nbr_nbma; | |
3454 | ||
3455 | nbr_nbma = THREAD_ARG (thread); | |
3456 | nbr_nbma->t_poll = NULL; | |
3457 | ||
3458 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3459 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Poll timer expire)", |
718e3744 | 3460 | IF_NAME (nbr_nbma->oi), inet_ntoa (nbr_nbma->addr)); |
3461 | ||
3462 | ospf_poll_send (nbr_nbma); | |
3463 | ||
3464 | if (nbr_nbma->v_poll > 0) | |
3465 | OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, | |
3466 | nbr_nbma->v_poll); | |
3467 | ||
3468 | return 0; | |
3469 | } | |
3470 | ||
3471 | ||
3472 | int | |
3473 | ospf_hello_reply_timer (struct thread *thread) | |
3474 | { | |
3475 | struct ospf_neighbor *nbr; | |
3476 | ||
3477 | nbr = THREAD_ARG (thread); | |
3478 | nbr->t_hello_reply = NULL; | |
3479 | ||
3480 | assert (nbr->oi); | |
3481 | ||
3482 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3483 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (hello-reply timer expire)", |
718e3744 | 3484 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); |
3485 | ||
aa276fd7 | 3486 | ospf_hello_send_sub (nbr->oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3487 | |
3488 | return 0; | |
3489 | } | |
3490 | ||
3491 | /* Send OSPF Hello. */ | |
3492 | void | |
3493 | ospf_hello_send (struct ospf_interface *oi) | |
3494 | { | |
718e3744 | 3495 | /* If this is passive interface, do not send OSPF Hello. */ |
7ffa8fa2 | 3496 | if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) |
718e3744 | 3497 | return; |
3498 | ||
718e3744 | 3499 | if (oi->type == OSPF_IFTYPE_NBMA) |
3500 | { | |
3501 | struct ospf_neighbor *nbr; | |
3502 | struct route_node *rn; | |
3503 | ||
3504 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3505 | if ((nbr = rn->info)) | |
3506 | if (nbr != oi->nbr_self) | |
3507 | if (nbr->state != NSM_Down) | |
3508 | { | |
3509 | /* RFC 2328 Section 9.5.1 | |
3510 | If the router is not eligible to become Designated Router, | |
3511 | it must periodically send Hello Packets to both the | |
3512 | Designated Router and the Backup Designated Router (if they | |
3513 | exist). */ | |
3514 | if (PRIORITY(oi) == 0 && | |
3515 | IPV4_ADDR_CMP(&DR(oi), &nbr->address.u.prefix4) && | |
3516 | IPV4_ADDR_CMP(&BDR(oi), &nbr->address.u.prefix4)) | |
3517 | continue; | |
3518 | ||
3519 | /* If the router is eligible to become Designated Router, it | |
3520 | must periodically send Hello Packets to all neighbors that | |
3521 | are also eligible. In addition, if the router is itself the | |
3522 | Designated Router or Backup Designated Router, it must also | |
3523 | send periodic Hello Packets to all other neighbors. */ | |
3524 | ||
3525 | if (nbr->priority == 0 && oi->state == ISM_DROther) | |
3526 | continue; | |
3527 | /* if oi->state == Waiting, send hello to all neighbors */ | |
aa276fd7 | 3528 | ospf_hello_send_sub (oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3529 | } |
718e3744 | 3530 | } |
3531 | else | |
3532 | { | |
3533 | /* Decide destination address. */ | |
3534 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
aa276fd7 PJ |
3535 | ospf_hello_send_sub (oi, oi->vl_data->peer_addr.s_addr); |
3536 | else | |
3537 | ospf_hello_send_sub (oi, htonl (OSPF_ALLSPFROUTERS)); | |
718e3744 | 3538 | } |
3539 | } | |
3540 | ||
3541 | /* Send OSPF Database Description. */ | |
3542 | void | |
3543 | ospf_db_desc_send (struct ospf_neighbor *nbr) | |
3544 | { | |
3545 | struct ospf_interface *oi; | |
3546 | struct ospf_packet *op; | |
3547 | u_int16_t length = OSPF_HEADER_SIZE; | |
3548 | ||
3549 | oi = nbr->oi; | |
3550 | op = ospf_packet_new (oi->ifp->mtu); | |
3551 | ||
3552 | /* Prepare OSPF common header. */ | |
3553 | ospf_make_header (OSPF_MSG_DB_DESC, oi, op->s); | |
3554 | ||
3555 | /* Prepare OSPF Database Description body. */ | |
3556 | length += ospf_make_db_desc (oi, nbr, op->s); | |
3557 | ||
3558 | /* Fill OSPF header. */ | |
3559 | ospf_fill_header (oi, op->s, length); | |
3560 | ||
3561 | /* Set packet length. */ | |
3562 | op->length = length; | |
3563 | ||
3564 | /* Decide destination address. */ | |
53d0dece JT |
3565 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3566 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3567 | else | |
3568 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3569 | |
3570 | /* Add packet to the interface output queue. */ | |
3571 | ospf_packet_add (oi, op); | |
3572 | ||
3573 | /* Hook thread to write packet. */ | |
020709f9 | 3574 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3575 | |
3576 | /* Remove old DD packet, then copy new one and keep in neighbor structure. */ | |
3577 | if (nbr->last_send) | |
3578 | ospf_packet_free (nbr->last_send); | |
3579 | nbr->last_send = ospf_packet_dup (op); | |
2518efd1 | 3580 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &nbr->last_send_ts); |
718e3744 | 3581 | } |
3582 | ||
3583 | /* Re-send Database Description. */ | |
3584 | void | |
3585 | ospf_db_desc_resend (struct ospf_neighbor *nbr) | |
3586 | { | |
3587 | struct ospf_interface *oi; | |
3588 | ||
3589 | oi = nbr->oi; | |
3590 | ||
3591 | /* Add packet to the interface output queue. */ | |
3592 | ospf_packet_add (oi, ospf_packet_dup (nbr->last_send)); | |
3593 | ||
3594 | /* Hook thread to write packet. */ | |
020709f9 | 3595 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3596 | } |
3597 | ||
3598 | /* Send Link State Request. */ | |
3599 | void | |
3600 | ospf_ls_req_send (struct ospf_neighbor *nbr) | |
3601 | { | |
3602 | struct ospf_interface *oi; | |
3603 | struct ospf_packet *op; | |
3604 | u_int16_t length = OSPF_HEADER_SIZE; | |
3605 | ||
3606 | oi = nbr->oi; | |
3607 | op = ospf_packet_new (oi->ifp->mtu); | |
3608 | ||
3609 | /* Prepare OSPF common header. */ | |
3610 | ospf_make_header (OSPF_MSG_LS_REQ, oi, op->s); | |
3611 | ||
3612 | /* Prepare OSPF Link State Request body. */ | |
3613 | length += ospf_make_ls_req (nbr, op->s); | |
3614 | if (length == OSPF_HEADER_SIZE) | |
3615 | { | |
3616 | ospf_packet_free (op); | |
3617 | return; | |
3618 | } | |
3619 | ||
3620 | /* Fill OSPF header. */ | |
3621 | ospf_fill_header (oi, op->s, length); | |
3622 | ||
3623 | /* Set packet length. */ | |
3624 | op->length = length; | |
3625 | ||
3626 | /* Decide destination address. */ | |
53d0dece JT |
3627 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3628 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3629 | else | |
3630 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3631 | |
3632 | /* Add packet to the interface output queue. */ | |
3633 | ospf_packet_add (oi, op); | |
3634 | ||
3635 | /* Hook thread to write packet. */ | |
020709f9 | 3636 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3637 | |
3638 | /* Add Link State Request Retransmission Timer. */ | |
3639 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
3640 | } | |
3641 | ||
3642 | /* Send Link State Update with an LSA. */ | |
3643 | void | |
3644 | ospf_ls_upd_send_lsa (struct ospf_neighbor *nbr, struct ospf_lsa *lsa, | |
3645 | int flag) | |
3646 | { | |
52dc7ee6 | 3647 | struct list *update; |
718e3744 | 3648 | |
3649 | update = list_new (); | |
3650 | ||
3651 | listnode_add (update, lsa); | |
3652 | ospf_ls_upd_send (nbr, update, flag); | |
3653 | ||
3654 | list_delete (update); | |
3655 | } | |
3656 | ||
68b7339a | 3657 | /* Determine size for packet. Must be at least big enough to accomodate next |
3658 | * LSA on list, which may be bigger than MTU size. | |
3659 | * | |
3660 | * Return pointer to new ospf_packet | |
3661 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3662 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3663 | */ | |
3664 | static struct ospf_packet * | |
3665 | ospf_ls_upd_packet_new (struct list *update, struct ospf_interface *oi) | |
3666 | { | |
3667 | struct ospf_lsa *lsa; | |
3668 | struct listnode *ln; | |
3669 | size_t size; | |
3670 | static char warned = 0; | |
3671 | ||
1eb8ef25 | 3672 | lsa = listgetdata((ln = listhead (update))); |
68b7339a | 3673 | assert (lsa->data); |
3674 | ||
3675 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs (lsa->data->length)) | |
3676 | > ospf_packet_max (oi)) | |
3677 | { | |
3678 | if (!warned) | |
3679 | { | |
3680 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA encountered!" | |
3681 | "will need to fragment. Not optimal. Try divide up" | |
3682 | " your network with areas. Use 'debug ospf packet send'" | |
3683 | " to see details, or look at 'show ip ospf database ..'"); | |
3684 | warned = 1; | |
3685 | } | |
3686 | ||
3687 | if (IS_DEBUG_OSPF_PACKET (0, SEND)) | |
2a42e285 | 3688 | zlog_debug ("ospf_ls_upd_packet_new: oversized LSA id:%s," |
68b7339a | 3689 | " %d bytes originated by %s, will be fragmented!", |
3690 | inet_ntoa (lsa->data->id), | |
3691 | ntohs (lsa->data->length), | |
3692 | inet_ntoa (lsa->data->adv_router)); | |
3693 | ||
3694 | /* | |
3695 | * Allocate just enough to fit this LSA only, to avoid including other | |
3696 | * LSAs in fragmented LSA Updates. | |
3697 | */ | |
3698 | size = ntohs (lsa->data->length) + (oi->ifp->mtu - ospf_packet_max (oi)) | |
3699 | + OSPF_LS_UPD_MIN_SIZE; | |
3700 | } | |
3701 | else | |
3702 | size = oi->ifp->mtu; | |
3703 | ||
3704 | if (size > OSPF_MAX_PACKET_SIZE) | |
3705 | { | |
3706 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA id:%s too big," | |
64511f39 | 3707 | " %d bytes, packet size %ld, dropping it completely." |
68b7339a | 3708 | " OSPF routing is broken!", |
37ccfa3d | 3709 | inet_ntoa (lsa->data->id), ntohs (lsa->data->length), |
62d8e96a | 3710 | (long int) size); |
68b7339a | 3711 | list_delete_node (update, ln); |
3712 | return NULL; | |
3713 | } | |
3714 | ||
c9035ccd DT |
3715 | /* IP header is built up separately by ospf_write(). This means, that we must |
3716 | * reduce the "affordable" size just calculated by length of an IP header. | |
3717 | * This makes sure, that even if we manage to fill the payload with LSA data | |
3718 | * completely, the final packet (our data plus IP header) still fits into | |
3719 | * outgoing interface MTU. This correction isn't really meaningful for an | |
3720 | * oversized LSA, but for consistency the correction is done for both cases. | |
3721 | * | |
3722 | * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size | |
3723 | */ | |
3724 | return ospf_packet_new (size - sizeof (struct ip)); | |
68b7339a | 3725 | } |
3726 | ||
718e3744 | 3727 | static void |
52dc7ee6 | 3728 | ospf_ls_upd_queue_send (struct ospf_interface *oi, struct list *update, |
718e3744 | 3729 | struct in_addr addr) |
3730 | { | |
3731 | struct ospf_packet *op; | |
3732 | u_int16_t length = OSPF_HEADER_SIZE; | |
3733 | ||
3734 | if (IS_DEBUG_OSPF_EVENT) | |
d06ccd47 DS |
3735 | zlog_debug ("listcount = %d, [%s]dst %s", listcount (update), IF_NAME(oi), |
3736 | inet_ntoa(addr)); | |
68b7339a | 3737 | |
3738 | op = ospf_ls_upd_packet_new (update, oi); | |
718e3744 | 3739 | |
3740 | /* Prepare OSPF common header. */ | |
3741 | ospf_make_header (OSPF_MSG_LS_UPD, oi, op->s); | |
3742 | ||
59ea14c6 | 3743 | /* Prepare OSPF Link State Update body. |
3744 | * Includes Type-7 translation. | |
3745 | */ | |
718e3744 | 3746 | length += ospf_make_ls_upd (oi, update, op->s); |
3747 | ||
3748 | /* Fill OSPF header. */ | |
3749 | ospf_fill_header (oi, op->s, length); | |
3750 | ||
3751 | /* Set packet length. */ | |
3752 | op->length = length; | |
3753 | ||
3754 | /* Decide destination address. */ | |
53d0dece JT |
3755 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3756 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3757 | else | |
3758 | op->dst.s_addr = addr.s_addr; | |
718e3744 | 3759 | |
3760 | /* Add packet to the interface output queue. */ | |
3761 | ospf_packet_add (oi, op); | |
3762 | ||
3763 | /* Hook thread to write packet. */ | |
020709f9 | 3764 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3765 | } |
3766 | ||
3767 | static int | |
3768 | ospf_ls_upd_send_queue_event (struct thread *thread) | |
3769 | { | |
3770 | struct ospf_interface *oi = THREAD_ARG(thread); | |
3771 | struct route_node *rn; | |
736d3441 | 3772 | struct route_node *rnext; |
59ea14c6 | 3773 | struct list *update; |
68b7339a | 3774 | char again = 0; |
718e3744 | 3775 | |
3776 | oi->t_ls_upd_event = NULL; | |
3777 | ||
3778 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3779 | zlog_debug ("ospf_ls_upd_send_queue start"); |
718e3744 | 3780 | |
736d3441 | 3781 | for (rn = route_top (oi->ls_upd_queue); rn; rn = rnext) |
718e3744 | 3782 | { |
736d3441 | 3783 | rnext = route_next (rn); |
3784 | ||
718e3744 | 3785 | if (rn->info == NULL) |
736d3441 | 3786 | continue; |
68b7339a | 3787 | |
3788 | update = (struct list *)rn->info; | |
718e3744 | 3789 | |
48fe13bf | 3790 | ospf_ls_upd_queue_send (oi, update, rn->p.u.prefix4); |
718e3744 | 3791 | |
68b7339a | 3792 | /* list might not be empty. */ |
59ea14c6 | 3793 | if (listcount(update) == 0) |
3794 | { | |
3795 | list_delete (rn->info); | |
3796 | rn->info = NULL; | |
3797 | route_unlock_node (rn); | |
3798 | } | |
3799 | else | |
68b7339a | 3800 | again = 1; |
59ea14c6 | 3801 | } |
3802 | ||
3803 | if (again != 0) | |
3804 | { | |
3805 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3806 | zlog_debug ("ospf_ls_upd_send_queue: update lists not cleared," |
59ea14c6 | 3807 | " %d nodes to try again, raising new event", again); |
3808 | oi->t_ls_upd_event = | |
3809 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
718e3744 | 3810 | } |
3811 | ||
3812 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3813 | zlog_debug ("ospf_ls_upd_send_queue stop"); |
59ea14c6 | 3814 | |
718e3744 | 3815 | return 0; |
3816 | } | |
3817 | ||
3818 | void | |
52dc7ee6 | 3819 | ospf_ls_upd_send (struct ospf_neighbor *nbr, struct list *update, int flag) |
718e3744 | 3820 | { |
3821 | struct ospf_interface *oi; | |
1eb8ef25 | 3822 | struct ospf_lsa *lsa; |
718e3744 | 3823 | struct prefix_ipv4 p; |
3824 | struct route_node *rn; | |
1eb8ef25 | 3825 | struct listnode *node; |
718e3744 | 3826 | |
3827 | oi = nbr->oi; | |
3828 | ||
3829 | p.family = AF_INET; | |
3830 | p.prefixlen = IPV4_MAX_BITLEN; | |
3831 | ||
3832 | /* Decide destination address. */ | |
3833 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3834 | p.prefix = oi->vl_data->peer_addr; | |
53d0dece JT |
3835 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3836 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3837 | else if (flag == OSPF_SEND_PACKET_DIRECT) |
3838 | p.prefix = nbr->address.u.prefix4; | |
3839 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3840 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
7afa08da | 3841 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3842 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3843 | else |
3844 | p.prefix.s_addr = htonl (OSPF_ALLDROUTERS); | |
3845 | ||
3846 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3847 | { | |
3848 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
3849 | zlog_warn ("* LS-Update is directly sent on NBMA network."); | |
3850 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix.s_addr)) | |
3851 | zlog_warn ("* LS-Update is sent to myself."); | |
3852 | } | |
3853 | ||
3854 | rn = route_node_get (oi->ls_upd_queue, (struct prefix *) &p); | |
3855 | ||
3856 | if (rn->info == NULL) | |
3857 | rn->info = list_new (); | |
326a0eb0 JT |
3858 | else |
3859 | route_unlock_node (rn); | |
718e3744 | 3860 | |
1eb8ef25 | 3861 | for (ALL_LIST_ELEMENTS_RO (update, node, lsa)) |
1fe6ed38 | 3862 | listnode_add (rn->info, ospf_lsa_lock (lsa)); /* oi->ls_upd_queue */ |
718e3744 | 3863 | |
3864 | if (oi->t_ls_upd_event == NULL) | |
3865 | oi->t_ls_upd_event = | |
3866 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
3867 | } | |
3868 | ||
3869 | static void | |
52dc7ee6 | 3870 | ospf_ls_ack_send_list (struct ospf_interface *oi, struct list *ack, |
3871 | struct in_addr dst) | |
718e3744 | 3872 | { |
3873 | struct ospf_packet *op; | |
3874 | u_int16_t length = OSPF_HEADER_SIZE; | |
3875 | ||
3876 | op = ospf_packet_new (oi->ifp->mtu); | |
3877 | ||
3878 | /* Prepare OSPF common header. */ | |
3879 | ospf_make_header (OSPF_MSG_LS_ACK, oi, op->s); | |
3880 | ||
3881 | /* Prepare OSPF Link State Acknowledgment body. */ | |
3882 | length += ospf_make_ls_ack (oi, ack, op->s); | |
3883 | ||
3884 | /* Fill OSPF header. */ | |
3885 | ospf_fill_header (oi, op->s, length); | |
3886 | ||
3887 | /* Set packet length. */ | |
3888 | op->length = length; | |
3889 | ||
86bede75 DS |
3890 | /* Decide destination address. */ |
3891 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3892 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3893 | else | |
3894 | op->dst.s_addr = dst.s_addr; | |
3895 | ||
718e3744 | 3896 | /* Add packet to the interface output queue. */ |
3897 | ospf_packet_add (oi, op); | |
3898 | ||
3899 | /* Hook thread to write packet. */ | |
020709f9 | 3900 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3901 | } |
3902 | ||
3903 | static int | |
3904 | ospf_ls_ack_send_event (struct thread *thread) | |
3905 | { | |
3906 | struct ospf_interface *oi = THREAD_ARG (thread); | |
3907 | ||
3908 | oi->t_ls_ack_direct = NULL; | |
3909 | ||
3910 | while (listcount (oi->ls_ack_direct.ls_ack)) | |
3911 | ospf_ls_ack_send_list (oi, oi->ls_ack_direct.ls_ack, | |
3912 | oi->ls_ack_direct.dst); | |
3913 | ||
3914 | return 0; | |
3915 | } | |
3916 | ||
3917 | void | |
3918 | ospf_ls_ack_send (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
3919 | { | |
3920 | struct ospf_interface *oi = nbr->oi; | |
3921 | ||
3922 | if (listcount (oi->ls_ack_direct.ls_ack) == 0) | |
3923 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
3924 | ||
3925 | listnode_add (oi->ls_ack_direct.ls_ack, ospf_lsa_lock (lsa)); | |
3926 | ||
3927 | if (oi->t_ls_ack_direct == NULL) | |
3928 | oi->t_ls_ack_direct = | |
3929 | thread_add_event (master, ospf_ls_ack_send_event, oi, 0); | |
3930 | } | |
3931 | ||
3932 | /* Send Link State Acknowledgment delayed. */ | |
3933 | void | |
3934 | ospf_ls_ack_send_delayed (struct ospf_interface *oi) | |
3935 | { | |
3936 | struct in_addr dst; | |
3937 | ||
3938 | /* Decide destination address. */ | |
3939 | /* RFC2328 Section 13.5 On non-broadcast | |
3940 | networks, delayed Link State Acknowledgment packets must be | |
3941 | unicast separately over each adjacency (i.e., neighbor whose | |
3942 | state is >= Exchange). */ | |
3943 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3944 | { | |
3945 | struct ospf_neighbor *nbr; | |
3946 | struct route_node *rn; | |
3947 | ||
3948 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3949 | if ((nbr = rn->info) != NULL) | |
3950 | if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange) | |
3951 | while (listcount (oi->ls_ack)) | |
3952 | ospf_ls_ack_send_list (oi, oi->ls_ack, nbr->address.u.prefix4); | |
3953 | return; | |
3954 | } | |
3955 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3956 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
3957 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3958 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3959 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3960 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
630e4807 | 3961 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3962 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3963 | else |
3964 | dst.s_addr = htonl (OSPF_ALLDROUTERS); | |
3965 | ||
3966 | while (listcount (oi->ls_ack)) | |
3967 | ospf_ls_ack_send_list (oi, oi->ls_ack, dst); | |
3968 | } | |
8b6912c2 DS |
3969 | |
3970 | /* | |
3971 | * On pt-to-pt links, all OSPF control packets are sent to the multicast | |
3972 | * address. As a result, the kernel does not need to learn the interface | |
3973 | * MAC of the OSPF neighbor. However, in our world, this will delay | |
3974 | * convergence. Take the case when due to a link flap, all routes now | |
3975 | * want to use an interface which was deemed to be costlier prior to this | |
3976 | * event. For routes that will be installed, the missing MAC will have | |
3977 | * punt-to-CPU set on them. This may overload the CPU control path that | |
3978 | * can be avoided if the MAC was known apriori. | |
3979 | */ | |
3980 | #define OSPF_PING_NBR_STR_MAX (8 + 40 + 20) | |
3981 | void | |
3982 | ospf_proactively_arp (struct ospf_neighbor *nbr) | |
3983 | { | |
3984 | char ping_nbr[OSPF_PING_NBR_STR_MAX]; | |
3985 | char *str_ptr; | |
3986 | int ret; | |
3987 | ||
cb2af5d0 | 3988 | if (!nbr || !nbr->oi || !nbr->oi->ifp) |
8b6912c2 DS |
3989 | return; |
3990 | ||
3991 | str_ptr = strcpy (ping_nbr, "ping -c 1 -I "); | |
3992 | str_ptr = strcat (str_ptr, nbr->oi->ifp->name); | |
3993 | str_ptr = strcat (str_ptr, " "); | |
3994 | str_ptr = strcat (str_ptr, inet_ntoa (nbr->address.u.prefix4)); | |
3995 | str_ptr = strcat (str_ptr, " > /dev/null 2>&1 &"); | |
3996 | ret = system (ping_nbr); | |
3997 | if (IS_DEBUG_OSPF_EVENT) | |
3998 | zlog_debug ("Executed %s %s", ping_nbr, | |
3999 | ((ret == 0) ? "successfully" : "but failed")); | |
4000 | } |