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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 | ||
718e3744 | 52 | /* Packet Type String. */ |
272ca1e3 | 53 | const struct message ospf_packet_type_str[] = |
718e3744 | 54 | { |
272ca1e3 DO |
55 | { OSPF_MSG_HELLO, "Hello" }, |
56 | { OSPF_MSG_DB_DESC, "Database Description" }, | |
57 | { OSPF_MSG_LS_REQ, "Link State Request" }, | |
58 | { OSPF_MSG_LS_UPD, "Link State Update" }, | |
59 | { OSPF_MSG_LS_ACK, "Link State Acknowledgment" }, | |
718e3744 | 60 | }; |
272ca1e3 DO |
61 | const size_t ospf_packet_type_str_max = sizeof (ospf_packet_type_str) / |
62 | sizeof (ospf_packet_type_str[0]); | |
718e3744 | 63 | |
75c8eabb DO |
64 | /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of |
65 | particular types, offset is the "type" field of a packet. */ | |
66 | static const u_int16_t ospf_packet_minlen[] = | |
67 | { | |
68 | 0, | |
69 | OSPF_HELLO_MIN_SIZE, | |
70 | OSPF_DB_DESC_MIN_SIZE, | |
71 | OSPF_LS_REQ_MIN_SIZE, | |
72 | OSPF_LS_UPD_MIN_SIZE, | |
73 | OSPF_LS_ACK_MIN_SIZE, | |
74 | }; | |
75 | ||
718e3744 | 76 | /* OSPF authentication checking function */ |
4dadc291 | 77 | static int |
718e3744 | 78 | ospf_auth_type (struct ospf_interface *oi) |
79 | { | |
80 | int auth_type; | |
81 | ||
82 | if (OSPF_IF_PARAM (oi, auth_type) == OSPF_AUTH_NOTSET) | |
83 | auth_type = oi->area->auth_type; | |
84 | else | |
85 | auth_type = OSPF_IF_PARAM (oi, auth_type); | |
86 | ||
87 | /* Handle case where MD5 key list is not configured aka Cisco */ | |
88 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC && | |
89 | list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
90 | return OSPF_AUTH_NULL; | |
91 | ||
92 | return auth_type; | |
93 | ||
94 | } | |
95 | ||
718e3744 | 96 | struct ospf_packet * |
97 | ospf_packet_new (size_t size) | |
98 | { | |
99 | struct ospf_packet *new; | |
100 | ||
101 | new = XCALLOC (MTYPE_OSPF_PACKET, sizeof (struct ospf_packet)); | |
102 | new->s = stream_new (size); | |
103 | ||
104 | return new; | |
105 | } | |
106 | ||
107 | void | |
108 | ospf_packet_free (struct ospf_packet *op) | |
109 | { | |
110 | if (op->s) | |
111 | stream_free (op->s); | |
112 | ||
113 | XFREE (MTYPE_OSPF_PACKET, op); | |
114 | ||
115 | op = NULL; | |
116 | } | |
117 | ||
118 | struct ospf_fifo * | |
119 | ospf_fifo_new () | |
120 | { | |
121 | struct ospf_fifo *new; | |
122 | ||
123 | new = XCALLOC (MTYPE_OSPF_FIFO, sizeof (struct ospf_fifo)); | |
124 | return new; | |
125 | } | |
126 | ||
127 | /* Add new packet to fifo. */ | |
128 | void | |
129 | ospf_fifo_push (struct ospf_fifo *fifo, struct ospf_packet *op) | |
130 | { | |
131 | if (fifo->tail) | |
132 | fifo->tail->next = op; | |
133 | else | |
134 | fifo->head = op; | |
135 | ||
136 | fifo->tail = op; | |
137 | ||
138 | fifo->count++; | |
139 | } | |
140 | ||
aa276fd7 PJ |
141 | /* Add new packet to head of fifo. */ |
142 | static void | |
143 | ospf_fifo_push_head (struct ospf_fifo *fifo, struct ospf_packet *op) | |
144 | { | |
145 | op->next = fifo->head; | |
146 | ||
147 | if (fifo->tail == NULL) | |
148 | fifo->tail = op; | |
149 | ||
150 | fifo->head = op; | |
151 | ||
152 | fifo->count++; | |
153 | } | |
154 | ||
718e3744 | 155 | /* Delete first packet from fifo. */ |
156 | struct ospf_packet * | |
157 | ospf_fifo_pop (struct ospf_fifo *fifo) | |
158 | { | |
159 | struct ospf_packet *op; | |
160 | ||
161 | op = fifo->head; | |
162 | ||
163 | if (op) | |
164 | { | |
165 | fifo->head = op->next; | |
166 | ||
167 | if (fifo->head == NULL) | |
168 | fifo->tail = NULL; | |
169 | ||
170 | fifo->count--; | |
171 | } | |
172 | ||
173 | return op; | |
174 | } | |
175 | ||
176 | /* Return first fifo entry. */ | |
177 | struct ospf_packet * | |
178 | ospf_fifo_head (struct ospf_fifo *fifo) | |
179 | { | |
180 | return fifo->head; | |
181 | } | |
182 | ||
183 | /* Flush ospf packet fifo. */ | |
184 | void | |
185 | ospf_fifo_flush (struct ospf_fifo *fifo) | |
186 | { | |
187 | struct ospf_packet *op; | |
188 | struct ospf_packet *next; | |
189 | ||
190 | for (op = fifo->head; op; op = next) | |
191 | { | |
192 | next = op->next; | |
193 | ospf_packet_free (op); | |
194 | } | |
195 | fifo->head = fifo->tail = NULL; | |
196 | fifo->count = 0; | |
197 | } | |
198 | ||
199 | /* Free ospf packet fifo. */ | |
200 | void | |
201 | ospf_fifo_free (struct ospf_fifo *fifo) | |
202 | { | |
203 | ospf_fifo_flush (fifo); | |
204 | ||
205 | XFREE (MTYPE_OSPF_FIFO, fifo); | |
206 | } | |
207 | ||
208 | void | |
209 | ospf_packet_add (struct ospf_interface *oi, struct ospf_packet *op) | |
210 | { | |
c3eab871 | 211 | if (!oi->obuf) |
212 | { | |
213 | zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
214 | "destination %s) called with NULL obuf, ignoring " | |
215 | "(please report this bug)!\n", | |
216 | IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state), | |
272ca1e3 | 217 | LOOKUP (ospf_packet_type_str, stream_getc_from(op->s, 1)), |
c3eab871 | 218 | inet_ntoa (op->dst)); |
219 | return; | |
220 | } | |
221 | ||
718e3744 | 222 | /* Add packet to end of queue. */ |
223 | ospf_fifo_push (oi->obuf, op); | |
224 | ||
225 | /* Debug of packet fifo*/ | |
226 | /* ospf_fifo_debug (oi->obuf); */ | |
227 | } | |
228 | ||
aa276fd7 PJ |
229 | static void |
230 | ospf_packet_add_top (struct ospf_interface *oi, struct ospf_packet *op) | |
231 | { | |
232 | if (!oi->obuf) | |
233 | { | |
234 | zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
235 | "destination %s) called with NULL obuf, ignoring " | |
236 | "(please report this bug)!\n", | |
237 | IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state), | |
7e0e2cb1 | 238 | LOOKUP (ospf_packet_type_str, stream_getc_from(op->s, 1)), |
aa276fd7 PJ |
239 | inet_ntoa (op->dst)); |
240 | return; | |
241 | } | |
242 | ||
243 | /* Add packet to head of queue. */ | |
244 | ospf_fifo_push_head (oi->obuf, op); | |
245 | ||
246 | /* Debug of packet fifo*/ | |
247 | /* ospf_fifo_debug (oi->obuf); */ | |
248 | } | |
249 | ||
718e3744 | 250 | void |
251 | ospf_packet_delete (struct ospf_interface *oi) | |
252 | { | |
253 | struct ospf_packet *op; | |
254 | ||
255 | op = ospf_fifo_pop (oi->obuf); | |
256 | ||
257 | if (op) | |
258 | ospf_packet_free (op); | |
259 | } | |
260 | ||
718e3744 | 261 | struct ospf_packet * |
262 | ospf_packet_dup (struct ospf_packet *op) | |
263 | { | |
264 | struct ospf_packet *new; | |
265 | ||
37163d6d | 266 | if (stream_get_endp(op->s) != op->length) |
08c83671 AS |
267 | /* XXX size_t */ |
268 | zlog_warn ("ospf_packet_dup stream %lu ospf_packet %u size mismatch", | |
269 | (u_long)STREAM_SIZE(op->s), op->length); | |
30961a15 | 270 | |
271 | /* Reserve space for MD5 authentication that may be added later. */ | |
272 | new = ospf_packet_new (stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
fa81b713 | 273 | stream_copy (new->s, op->s); |
718e3744 | 274 | |
275 | new->dst = op->dst; | |
276 | new->length = op->length; | |
277 | ||
278 | return new; | |
279 | } | |
280 | ||
86f1fd96 | 281 | /* XXX inline */ |
f63f06da | 282 | static unsigned int |
86f1fd96 | 283 | ospf_packet_authspace (struct ospf_interface *oi) |
284 | { | |
285 | int auth = 0; | |
286 | ||
287 | if ( ospf_auth_type (oi) == OSPF_AUTH_CRYPTOGRAPHIC) | |
288 | auth = OSPF_AUTH_MD5_SIZE; | |
289 | ||
290 | return auth; | |
291 | } | |
292 | ||
4dadc291 | 293 | static unsigned int |
718e3744 | 294 | ospf_packet_max (struct ospf_interface *oi) |
295 | { | |
296 | int max; | |
297 | ||
86f1fd96 | 298 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
299 | ||
68b7339a | 300 | max -= (OSPF_HEADER_SIZE + sizeof (struct ip)); |
718e3744 | 301 | |
302 | return max; | |
303 | } | |
304 | ||
305 | \f | |
4dadc291 | 306 | static int |
718e3744 | 307 | ospf_check_md5_digest (struct ospf_interface *oi, struct stream *s, |
308 | u_int16_t length) | |
309 | { | |
6c835671 | 310 | unsigned char *ibuf; |
c1a03d47 | 311 | MD5_CTX ctx; |
718e3744 | 312 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; |
313 | unsigned char *pdigest; | |
314 | struct crypt_key *ck; | |
315 | struct ospf_header *ospfh; | |
316 | struct ospf_neighbor *nbr; | |
317 | ||
318 | ||
319 | ibuf = STREAM_PNT (s); | |
320 | ospfh = (struct ospf_header *) ibuf; | |
321 | ||
322 | /* Get pointer to the end of the packet. */ | |
323 | pdigest = ibuf + length; | |
324 | ||
325 | /* Get secret key. */ | |
326 | ck = ospf_crypt_key_lookup (OSPF_IF_PARAM (oi, auth_crypt), | |
327 | ospfh->u.crypt.key_id); | |
328 | if (ck == NULL) | |
329 | { | |
330 | zlog_warn ("interface %s: ospf_check_md5 no key %d", | |
331 | IF_NAME (oi), ospfh->u.crypt.key_id); | |
332 | return 0; | |
333 | } | |
334 | ||
335 | /* check crypto seqnum. */ | |
336 | nbr = ospf_nbr_lookup_by_routerid (oi->nbrs, &ospfh->router_id); | |
337 | ||
338 | if (nbr && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) | |
339 | { | |
340 | zlog_warn ("interface %s: ospf_check_md5 bad sequence %d (expect %d)", | |
341 | IF_NAME (oi), | |
342 | ntohl(ospfh->u.crypt.crypt_seqnum), | |
343 | ntohl(nbr->crypt_seqnum)); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | /* Generate a digest for the ospf packet - their digest + our digest. */ | |
c1a03d47 | 348 | memset(&ctx, 0, sizeof(ctx)); |
349 | MD5Init(&ctx); | |
350 | MD5Update(&ctx, ibuf, length); | |
351 | MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); | |
352 | MD5Final(digest, &ctx); | |
718e3744 | 353 | |
354 | /* compare the two */ | |
355 | if (memcmp (pdigest, digest, OSPF_AUTH_MD5_SIZE)) | |
356 | { | |
357 | zlog_warn ("interface %s: ospf_check_md5 checksum mismatch", | |
358 | IF_NAME (oi)); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | /* save neighbor's crypt_seqnum */ | |
363 | if (nbr) | |
364 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
365 | return 1; | |
366 | } | |
367 | ||
368 | /* This function is called from ospf_write(), it will detect the | |
369 | authentication scheme and if it is MD5, it will change the sequence | |
370 | and update the MD5 digest. */ | |
4dadc291 | 371 | static int |
718e3744 | 372 | ospf_make_md5_digest (struct ospf_interface *oi, struct ospf_packet *op) |
373 | { | |
374 | struct ospf_header *ospfh; | |
375 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; | |
c1a03d47 | 376 | MD5_CTX ctx; |
718e3744 | 377 | void *ibuf; |
9483e155 | 378 | u_int32_t t; |
718e3744 | 379 | struct crypt_key *ck; |
3623814a | 380 | const u_int8_t *auth_key; |
718e3744 | 381 | |
382 | ibuf = STREAM_DATA (op->s); | |
383 | ospfh = (struct ospf_header *) ibuf; | |
384 | ||
385 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
386 | return 0; | |
387 | ||
388 | /* We do this here so when we dup a packet, we don't have to | |
2518efd1 PJ |
389 | waste CPU rewriting other headers. |
390 | ||
391 | Note that quagga_time /deliberately/ is not used here */ | |
9483e155 | 392 | t = (time(NULL) & 0xFFFFFFFF); |
818e56cf | 393 | if (t > oi->crypt_seqnum) |
394 | oi->crypt_seqnum = t; | |
395 | else | |
396 | oi->crypt_seqnum++; | |
397 | ||
9483e155 | 398 | ospfh->u.crypt.crypt_seqnum = htonl (oi->crypt_seqnum); |
718e3744 | 399 | |
400 | /* Get MD5 Authentication key from auth_key list. */ | |
401 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
3623814a | 402 | auth_key = (const u_int8_t *) ""; |
718e3744 | 403 | else |
404 | { | |
1eb8ef25 | 405 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
4dadc291 | 406 | auth_key = ck->auth_key; |
718e3744 | 407 | } |
408 | ||
409 | /* Generate a digest for the entire packet + our secret key. */ | |
c1a03d47 | 410 | memset(&ctx, 0, sizeof(ctx)); |
411 | MD5Init(&ctx); | |
412 | MD5Update(&ctx, ibuf, ntohs (ospfh->length)); | |
413 | MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
414 | MD5Final(digest, &ctx); | |
718e3744 | 415 | |
416 | /* Append md5 digest to the end of the stream. */ | |
718e3744 | 417 | stream_put (op->s, digest, OSPF_AUTH_MD5_SIZE); |
718e3744 | 418 | |
419 | /* We do *NOT* increment the OSPF header length. */ | |
30961a15 | 420 | op->length = ntohs (ospfh->length) + OSPF_AUTH_MD5_SIZE; |
421 | ||
37163d6d | 422 | if (stream_get_endp(op->s) != op->length) |
08c83671 AS |
423 | /* XXX size_t */ |
424 | zlog_warn("ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u", | |
425 | (u_long)stream_get_endp(op->s), op->length); | |
718e3744 | 426 | |
427 | return OSPF_AUTH_MD5_SIZE; | |
428 | } | |
429 | ||
430 | \f | |
4dadc291 | 431 | static int |
718e3744 | 432 | ospf_ls_req_timer (struct thread *thread) |
433 | { | |
434 | struct ospf_neighbor *nbr; | |
435 | ||
436 | nbr = THREAD_ARG (thread); | |
437 | nbr->t_ls_req = NULL; | |
438 | ||
439 | /* Send Link State Request. */ | |
440 | if (ospf_ls_request_count (nbr)) | |
441 | ospf_ls_req_send (nbr); | |
442 | ||
443 | /* Set Link State Request retransmission timer. */ | |
444 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | void | |
450 | ospf_ls_req_event (struct ospf_neighbor *nbr) | |
451 | { | |
452 | if (nbr->t_ls_req) | |
453 | { | |
454 | thread_cancel (nbr->t_ls_req); | |
455 | nbr->t_ls_req = NULL; | |
456 | } | |
457 | nbr->t_ls_req = thread_add_event (master, ospf_ls_req_timer, nbr, 0); | |
458 | } | |
459 | ||
460 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
461 | ospf_neighbor.c */ | |
462 | int | |
463 | ospf_ls_upd_timer (struct thread *thread) | |
464 | { | |
465 | struct ospf_neighbor *nbr; | |
466 | ||
467 | nbr = THREAD_ARG (thread); | |
468 | nbr->t_ls_upd = NULL; | |
469 | ||
470 | /* Send Link State Update. */ | |
471 | if (ospf_ls_retransmit_count (nbr) > 0) | |
472 | { | |
52dc7ee6 | 473 | struct list *update; |
718e3744 | 474 | struct ospf_lsdb *lsdb; |
475 | int i; | |
718e3744 | 476 | int retransmit_interval; |
477 | ||
718e3744 | 478 | retransmit_interval = OSPF_IF_PARAM (nbr->oi, retransmit_interval); |
479 | ||
480 | lsdb = &nbr->ls_rxmt; | |
481 | update = list_new (); | |
482 | ||
483 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
484 | { | |
485 | struct route_table *table = lsdb->type[i].db; | |
486 | struct route_node *rn; | |
487 | ||
488 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
489 | { | |
490 | struct ospf_lsa *lsa; | |
491 | ||
492 | if ((lsa = rn->info) != NULL) | |
493 | /* Don't retransmit an LSA if we received it within | |
494 | the last RxmtInterval seconds - this is to allow the | |
495 | neighbour a chance to acknowledge the LSA as it may | |
496 | have ben just received before the retransmit timer | |
497 | fired. This is a small tweak to what is in the RFC, | |
498 | but it will cut out out a lot of retransmit traffic | |
499 | - MAG */ | |
2518efd1 | 500 | if (tv_cmp (tv_sub (recent_relative_time (), lsa->tv_recv), |
718e3744 | 501 | int2tv (retransmit_interval)) >= 0) |
502 | listnode_add (update, rn->info); | |
503 | } | |
504 | } | |
505 | ||
506 | if (listcount (update) > 0) | |
507 | ospf_ls_upd_send (nbr, update, OSPF_SEND_PACKET_DIRECT); | |
508 | list_delete (update); | |
509 | } | |
510 | ||
511 | /* Set LS Update retransmission timer. */ | |
512 | OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | int | |
518 | ospf_ls_ack_timer (struct thread *thread) | |
519 | { | |
520 | struct ospf_interface *oi; | |
521 | ||
522 | oi = THREAD_ARG (thread); | |
523 | oi->t_ls_ack = NULL; | |
524 | ||
525 | /* Send Link State Acknowledgment. */ | |
526 | if (listcount (oi->ls_ack) > 0) | |
527 | ospf_ls_ack_send_delayed (oi); | |
528 | ||
529 | /* Set LS Ack timer. */ | |
530 | OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
0bfeca3f | 535 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
5dcbdf82 | 536 | static void |
6a99f831 | 537 | ospf_write_frags (int fd, struct ospf_packet *op, struct ip *iph, |
62d8e96a | 538 | struct msghdr *msg, unsigned int maxdatasize, |
37ccfa3d | 539 | unsigned int mtu, int flags, u_char type) |
0bfeca3f | 540 | { |
541 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
6a99f831 | 542 | u_int16_t offset; |
62d8e96a | 543 | struct iovec *iovp; |
6a99f831 | 544 | int ret; |
0bfeca3f | 545 | |
546 | assert ( op->length == stream_get_endp(op->s) ); | |
62d8e96a | 547 | assert (msg->msg_iovlen == 2); |
0bfeca3f | 548 | |
549 | /* we can but try. | |
550 | * | |
551 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
552 | * well as the IP_MF flag, making this all quite pointless. | |
553 | * | |
554 | * However, for a system on which IP_MF is left alone, and ip_id left | |
555 | * alone or else which sets same ip_id for each fragment this might | |
556 | * work, eg linux. | |
557 | * | |
558 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
559 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
560 | * be raised against the various kernels. | |
561 | */ | |
562 | ||
563 | /* set More Frag */ | |
564 | iph->ip_off |= IP_MF; | |
565 | ||
566 | /* ip frag offset is expressed in units of 8byte words */ | |
567 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
568 | ||
62d8e96a | 569 | iovp = &msg->msg_iov[1]; |
570 | ||
0bfeca3f | 571 | while ( (stream_get_endp(op->s) - stream_get_getp (op->s)) |
572 | > maxdatasize ) | |
573 | { | |
574 | /* data length of this frag is to next offset value */ | |
62d8e96a | 575 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; |
576 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
6a99f831 | 577 | assert (iph->ip_len <= mtu); |
0bfeca3f | 578 | |
18b12c38 | 579 | sockopt_iphdrincl_swab_htosys (iph); |
0bfeca3f | 580 | |
6a99f831 | 581 | ret = sendmsg (fd, msg, flags); |
0bfeca3f | 582 | |
18b12c38 | 583 | sockopt_iphdrincl_swab_systoh (iph); |
0bfeca3f | 584 | |
585 | if (ret < 0) | |
37ccfa3d | 586 | zlog_warn ("*** ospf_write_frags: sendmsg failed to %s," |
5dcbdf82 | 587 | " id %d, off %d, len %d, mtu %u failed with %s", |
588 | inet_ntoa (iph->ip_dst), | |
589 | iph->ip_id, | |
590 | iph->ip_off, | |
591 | iph->ip_len, | |
592 | mtu, | |
593 | safe_strerror (errno)); | |
0bfeca3f | 594 | |
37ccfa3d | 595 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) |
596 | { | |
2a42e285 | 597 | zlog_debug ("ospf_write_frags: sent id %d, off %d, len %d to %s\n", |
37ccfa3d | 598 | iph->ip_id, iph->ip_off, iph->ip_len, |
599 | inet_ntoa (iph->ip_dst)); | |
600 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
601 | { | |
2a42e285 | 602 | zlog_debug ("-----------------IP Header Dump----------------------"); |
37ccfa3d | 603 | ospf_ip_header_dump (iph); |
2a42e285 | 604 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 605 | } |
606 | } | |
607 | ||
0bfeca3f | 608 | iph->ip_off += offset; |
9985f83c | 609 | stream_forward_getp (op->s, iovp->iov_len); |
62d8e96a | 610 | iovp->iov_base = STREAM_PNT (op->s); |
0bfeca3f | 611 | } |
612 | ||
613 | /* setup for final fragment */ | |
62d8e96a | 614 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp (op->s); |
615 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
0bfeca3f | 616 | iph->ip_off &= (~IP_MF); |
617 | } | |
618 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
619 | ||
5dcbdf82 | 620 | static int |
718e3744 | 621 | ospf_write (struct thread *thread) |
622 | { | |
68980084 | 623 | struct ospf *ospf = THREAD_ARG (thread); |
718e3744 | 624 | struct ospf_interface *oi; |
625 | struct ospf_packet *op; | |
626 | struct sockaddr_in sa_dst; | |
718e3744 | 627 | struct ip iph; |
628 | struct msghdr msg; | |
62d8e96a | 629 | struct iovec iov[2]; |
68980084 | 630 | u_char type; |
631 | int ret; | |
632 | int flags = 0; | |
52dc7ee6 | 633 | struct listnode *node; |
0bfeca3f | 634 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 635 | static u_int16_t ipid = 0; |
0bfeca3f | 636 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
6a99f831 | 637 | u_int16_t maxdatasize; |
68b7339a | 638 | #define OSPF_WRITE_IPHL_SHIFT 2 |
718e3744 | 639 | |
68980084 | 640 | ospf->t_write = NULL; |
718e3744 | 641 | |
68980084 | 642 | node = listhead (ospf->oi_write_q); |
718e3744 | 643 | assert (node); |
1eb8ef25 | 644 | oi = listgetdata (node); |
718e3744 | 645 | assert (oi); |
0bfeca3f | 646 | |
647 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
68b7339a | 648 | /* seed ipid static with low order bits of time */ |
649 | if (ipid == 0) | |
650 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 651 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
652 | ||
b7fe4141 DO |
653 | /* convenience - max OSPF data per packet, |
654 | * and reliability - not more data, than our | |
655 | * socket can accept | |
656 | */ | |
657 | maxdatasize = MIN (oi->ifp->mtu, ospf->maxsndbuflen) - | |
658 | sizeof (struct ip); | |
68b7339a | 659 | |
718e3744 | 660 | /* Get one packet from queue. */ |
661 | op = ospf_fifo_head (oi->obuf); | |
662 | assert (op); | |
663 | assert (op->length >= OSPF_HEADER_SIZE); | |
664 | ||
68980084 | 665 | if (op->dst.s_addr == htonl (OSPF_ALLSPFROUTERS) |
666 | || op->dst.s_addr == htonl (OSPF_ALLDROUTERS)) | |
68b7339a | 667 | ospf_if_ipmulticast (ospf, oi->address, oi->ifp->ifindex); |
668 | ||
718e3744 | 669 | /* Rewrite the md5 signature & update the seq */ |
670 | ospf_make_md5_digest (oi, op); | |
671 | ||
37ccfa3d | 672 | /* Retrieve OSPF packet type. */ |
673 | stream_set_getp (op->s, 1); | |
674 | type = stream_getc (op->s); | |
675 | ||
68b7339a | 676 | /* reset get pointer */ |
677 | stream_set_getp (op->s, 0); | |
678 | ||
679 | memset (&iph, 0, sizeof (struct ip)); | |
718e3744 | 680 | memset (&sa_dst, 0, sizeof (sa_dst)); |
68b7339a | 681 | |
718e3744 | 682 | sa_dst.sin_family = AF_INET; |
6f0e3f6e | 683 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
718e3744 | 684 | sa_dst.sin_len = sizeof(sa_dst); |
6f0e3f6e | 685 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 686 | sa_dst.sin_addr = op->dst; |
687 | sa_dst.sin_port = htons (0); | |
688 | ||
689 | /* Set DONTROUTE flag if dst is unicast. */ | |
690 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
691 | if (!IN_MULTICAST (htonl (op->dst.s_addr))) | |
692 | flags = MSG_DONTROUTE; | |
693 | ||
68b7339a | 694 | iph.ip_hl = sizeof (struct ip) >> OSPF_WRITE_IPHL_SHIFT; |
695 | /* it'd be very strange for header to not be 4byte-word aligned but.. */ | |
6c835671 | 696 | if ( sizeof (struct ip) |
697 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) ) | |
68b7339a | 698 | iph.ip_hl++; /* we presume sizeof struct ip cant overflow ip_hl.. */ |
699 | ||
718e3744 | 700 | iph.ip_v = IPVERSION; |
68980084 | 701 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; |
68b7339a | 702 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; |
68b7339a | 703 | |
0150c9c9 DB |
704 | #if defined(__DragonFly__) |
705 | /* | |
706 | * DragonFly's raw socket expects ip_len/ip_off in network byte order. | |
707 | */ | |
708 | iph.ip_len = htons(iph.ip_len); | |
709 | #endif | |
710 | ||
0bfeca3f | 711 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 712 | /* XXX-MT: not thread-safe at all.. |
713 | * XXX: this presumes this is only programme sending OSPF packets | |
714 | * otherwise, no guarantee ipid will be unique | |
715 | */ | |
716 | iph.ip_id = ++ipid; | |
0bfeca3f | 717 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718 | ||
718e3744 | 719 | iph.ip_off = 0; |
720 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
721 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
722 | else | |
723 | iph.ip_ttl = OSPF_IP_TTL; | |
724 | iph.ip_p = IPPROTO_OSPFIGP; | |
725 | iph.ip_sum = 0; | |
726 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
727 | iph.ip_dst.s_addr = op->dst.s_addr; | |
728 | ||
729 | memset (&msg, 0, sizeof (msg)); | |
68defd6d | 730 | msg.msg_name = (caddr_t) &sa_dst; |
718e3744 | 731 | msg.msg_namelen = sizeof (sa_dst); |
732 | msg.msg_iov = iov; | |
733 | msg.msg_iovlen = 2; | |
734 | iov[0].iov_base = (char*)&iph; | |
68b7339a | 735 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; |
736 | iov[1].iov_base = STREAM_PNT (op->s); | |
718e3744 | 737 | iov[1].iov_len = op->length; |
68b7339a | 738 | |
739 | /* Sadly we can not rely on kernels to fragment packets because of either | |
740 | * IP_HDRINCL and/or multicast destination being set. | |
741 | */ | |
0bfeca3f | 742 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 743 | if ( op->length > maxdatasize ) |
62d8e96a | 744 | ospf_write_frags (ospf->fd, op, &iph, &msg, maxdatasize, |
745 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 746 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 747 | |
68b7339a | 748 | /* send final fragment (could be first) */ |
18b12c38 | 749 | sockopt_iphdrincl_swab_htosys (&iph); |
68980084 | 750 | ret = sendmsg (ospf->fd, &msg, flags); |
6b333611 | 751 | sockopt_iphdrincl_swab_systoh (&iph); |
718e3744 | 752 | |
753 | if (ret < 0) | |
083ee9d9 | 754 | zlog_warn ("*** sendmsg in ospf_write failed to %s, " |
5dcbdf82 | 755 | "id %d, off %d, len %d, interface %s, mtu %u: %s", |
083ee9d9 | 756 | inet_ntoa (iph.ip_dst), iph.ip_id, iph.ip_off, iph.ip_len, |
5dcbdf82 | 757 | oi->ifp->name, oi->ifp->mtu, safe_strerror (errno)); |
718e3744 | 758 | |
718e3744 | 759 | /* Show debug sending packet. */ |
760 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) | |
761 | { | |
762 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
763 | { | |
2a42e285 | 764 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 765 | ospf_ip_header_dump (&iph); |
718e3744 | 766 | stream_set_getp (op->s, 0); |
767 | ospf_packet_dump (op->s); | |
768 | } | |
769 | ||
2a42e285 | 770 | zlog_debug ("%s sent to [%s] via [%s].", |
272ca1e3 | 771 | LOOKUP (ospf_packet_type_str, type), inet_ntoa (op->dst), |
718e3744 | 772 | IF_NAME (oi)); |
773 | ||
774 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
2a42e285 | 775 | zlog_debug ("-----------------------------------------------------"); |
718e3744 | 776 | } |
777 | ||
778 | /* Now delete packet from queue. */ | |
779 | ospf_packet_delete (oi); | |
780 | ||
781 | if (ospf_fifo_head (oi->obuf) == NULL) | |
782 | { | |
783 | oi->on_write_q = 0; | |
68980084 | 784 | list_delete_node (ospf->oi_write_q, node); |
718e3744 | 785 | } |
786 | ||
787 | /* If packets still remain in queue, call write thread. */ | |
68980084 | 788 | if (!list_isempty (ospf->oi_write_q)) |
789 | ospf->t_write = | |
790 | thread_add_write (master, ospf_write, ospf, ospf->fd); | |
718e3744 | 791 | |
792 | return 0; | |
793 | } | |
794 | ||
795 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
4dadc291 | 796 | static void |
718e3744 | 797 | ospf_hello (struct ip *iph, struct ospf_header *ospfh, |
798 | struct stream * s, struct ospf_interface *oi, int size) | |
799 | { | |
800 | struct ospf_hello *hello; | |
801 | struct ospf_neighbor *nbr; | |
718e3744 | 802 | int old_state; |
d3f0d621 | 803 | struct prefix p; |
718e3744 | 804 | |
805 | /* increment statistics. */ | |
806 | oi->hello_in++; | |
807 | ||
808 | hello = (struct ospf_hello *) STREAM_PNT (s); | |
809 | ||
810 | /* If Hello is myself, silently discard. */ | |
68980084 | 811 | if (IPV4_ADDR_SAME (&ospfh->router_id, &oi->ospf->router_id)) |
d324181c | 812 | { |
813 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
814 | { | |
2a42e285 | 815 | zlog_debug ("ospf_header[%s/%s]: selforiginated, " |
d324181c | 816 | "dropping.", |
272ca1e3 | 817 | LOOKUP (ospf_packet_type_str, ospfh->type), |
d324181c | 818 | inet_ntoa (iph->ip_src)); |
819 | } | |
820 | return; | |
821 | } | |
718e3744 | 822 | |
718e3744 | 823 | /* get neighbor prefix. */ |
824 | p.family = AF_INET; | |
825 | p.prefixlen = ip_masklen (hello->network_mask); | |
826 | p.u.prefix4 = iph->ip_src; | |
827 | ||
828 | /* Compare network mask. */ | |
829 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
830 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
831 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
832 | if (oi->address->prefixlen != p.prefixlen) | |
833 | { | |
13cd3dc1 AS |
834 | zlog_warn ("Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).", |
835 | inet_ntoa(ospfh->router_id), IF_NAME(oi), | |
836 | (int)oi->address->prefixlen, (int)p.prefixlen); | |
718e3744 | 837 | return; |
838 | } | |
839 | ||
718e3744 | 840 | /* Compare Router Dead Interval. */ |
841 | if (OSPF_IF_PARAM (oi, v_wait) != ntohl (hello->dead_interval)) | |
842 | { | |
08c83671 AS |
843 | zlog_warn ("Packet %s [Hello:RECV]: RouterDeadInterval mismatch " |
844 | "(expected %u, but received %u).", | |
845 | inet_ntoa(ospfh->router_id), | |
846 | OSPF_IF_PARAM(oi, v_wait), ntohl(hello->dead_interval)); | |
718e3744 | 847 | return; |
848 | } | |
849 | ||
f9ad937f | 850 | /* Compare Hello Interval - ignored if fast-hellos are set. */ |
851 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) | |
852 | { | |
853 | if (OSPF_IF_PARAM (oi, v_hello) != ntohs (hello->hello_interval)) | |
854 | { | |
08c83671 AS |
855 | zlog_warn ("Packet %s [Hello:RECV]: HelloInterval mismatch " |
856 | "(expected %u, but received %u).", | |
857 | inet_ntoa(ospfh->router_id), | |
858 | OSPF_IF_PARAM(oi, v_hello), ntohs(hello->hello_interval)); | |
f9ad937f | 859 | return; |
860 | } | |
861 | } | |
862 | ||
718e3744 | 863 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 864 | zlog_debug ("Packet %s [Hello:RECV]: Options %s", |
718e3744 | 865 | inet_ntoa (ospfh->router_id), |
866 | ospf_options_dump (hello->options)); | |
867 | ||
868 | /* Compare options. */ | |
869 | #define REJECT_IF_TBIT_ON 1 /* XXX */ | |
870 | #ifdef REJECT_IF_TBIT_ON | |
871 | if (CHECK_FLAG (hello->options, OSPF_OPTION_T)) | |
872 | { | |
873 | /* | |
874 | * This router does not support non-zero TOS. | |
875 | * Drop this Hello packet not to establish neighbor relationship. | |
876 | */ | |
877 | zlog_warn ("Packet %s [Hello:RECV]: T-bit on, drop it.", | |
878 | inet_ntoa (ospfh->router_id)); | |
879 | return; | |
880 | } | |
881 | #endif /* REJECT_IF_TBIT_ON */ | |
882 | ||
883 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 884 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
718e3744 | 885 | && CHECK_FLAG (hello->options, OSPF_OPTION_O)) |
886 | { | |
887 | /* | |
888 | * This router does know the correct usage of O-bit | |
889 | * the bit should be set in DD packet only. | |
890 | */ | |
891 | zlog_warn ("Packet %s [Hello:RECV]: O-bit abuse?", | |
892 | inet_ntoa (ospfh->router_id)); | |
893 | #ifdef STRICT_OBIT_USAGE_CHECK | |
894 | return; /* Reject this packet. */ | |
895 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
896 | UNSET_FLAG (hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
897 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
898 | } | |
899 | #endif /* HAVE_OPAQUE_LSA */ | |
900 | ||
901 | /* new for NSSA is to ensure that NP is on and E is off */ | |
902 | ||
718e3744 | 903 | if (oi->area->external_routing == OSPF_AREA_NSSA) |
904 | { | |
905 | if (! (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_NP) | |
906 | && CHECK_FLAG (hello->options, OSPF_OPTION_NP) | |
907 | && ! CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) | |
908 | && ! CHECK_FLAG (hello->options, OSPF_OPTION_E))) | |
909 | { | |
910 | zlog_warn ("NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", inet_ntoa (ospfh->router_id), OPTIONS (oi), hello->options); | |
911 | return; | |
912 | } | |
913 | if (IS_DEBUG_OSPF_NSSA) | |
2a42e285 | 914 | zlog_debug ("NSSA-Hello:RECV:Packet from %s:", inet_ntoa(ospfh->router_id)); |
718e3744 | 915 | } |
916 | else | |
718e3744 | 917 | /* The setting of the E-bit found in the Hello Packet's Options |
918 | field must match this area's ExternalRoutingCapability A | |
919 | mismatch causes processing to stop and the packet to be | |
920 | dropped. The setting of the rest of the bits in the Hello | |
921 | Packet's Options field should be ignored. */ | |
922 | if (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) != | |
923 | CHECK_FLAG (hello->options, OSPF_OPTION_E)) | |
924 | { | |
3aa8d5f9 | 925 | zlog_warn ("Packet %s [Hello:RECV]: my options: %x, his options %x", |
926 | inet_ntoa(ospfh->router_id), OPTIONS (oi), hello->options); | |
718e3744 | 927 | return; |
928 | } | |
718e3744 | 929 | |
d3f0d621 | 930 | /* get neighbour struct */ |
931 | nbr = ospf_nbr_get (oi, ospfh, iph, &p); | |
932 | ||
933 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
934 | assert (nbr); | |
718e3744 | 935 | |
936 | old_state = nbr->state; | |
937 | ||
938 | /* Add event to thread. */ | |
57c5c652 | 939 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); |
718e3744 | 940 | |
941 | /* RFC2328 Section 9.5.1 | |
942 | If the router is not eligible to become Designated Router, | |
943 | (snip) It must also send an Hello Packet in reply to an | |
944 | Hello Packet received from any eligible neighbor (other than | |
945 | the current Designated Router and Backup Designated Router). */ | |
946 | if (oi->type == OSPF_IFTYPE_NBMA) | |
947 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
948 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
949 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
950 | OSPF_NSM_TIMER_ON (nbr->t_hello_reply, ospf_hello_reply_timer, | |
951 | OSPF_HELLO_REPLY_DELAY); | |
952 | ||
953 | /* on NBMA network type, it happens to receive bidirectional Hello packet | |
954 | without advance 1-Way Received event. | |
955 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
956 | if (oi->type == OSPF_IFTYPE_NBMA && | |
957 | (old_state == NSM_Down || old_state == NSM_Attempt)) | |
958 | { | |
57c5c652 | 959 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_OneWayReceived); |
718e3744 | 960 | nbr->priority = hello->priority; |
961 | nbr->d_router = hello->d_router; | |
962 | nbr->bd_router = hello->bd_router; | |
963 | return; | |
964 | } | |
965 | ||
68980084 | 966 | if (ospf_nbr_bidirectional (&oi->ospf->router_id, hello->neighbors, |
718e3744 | 967 | size - OSPF_HELLO_MIN_SIZE)) |
968 | { | |
57c5c652 | 969 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_TwoWayReceived); |
718e3744 | 970 | nbr->options |= hello->options; |
971 | } | |
972 | else | |
973 | { | |
57c5c652 | 974 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_OneWayReceived); |
718e3744 | 975 | /* Set neighbor information. */ |
976 | nbr->priority = hello->priority; | |
977 | nbr->d_router = hello->d_router; | |
978 | nbr->bd_router = hello->bd_router; | |
979 | return; | |
980 | } | |
981 | ||
982 | /* If neighbor itself declares DR and no BDR exists, | |
983 | cause event BackupSeen */ | |
984 | if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router)) | |
985 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
986 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
987 | ||
988 | /* neighbor itself declares BDR. */ | |
989 | if (oi->state == ISM_Waiting && | |
990 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router)) | |
991 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
992 | ||
993 | /* had not previously. */ | |
994 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router) && | |
995 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->d_router)) || | |
996 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->d_router) && | |
997 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->d_router))) | |
998 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
999 | ||
1000 | /* had not previously. */ | |
1001 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router) && | |
1002 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->bd_router)) || | |
1003 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->bd_router) && | |
1004 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->bd_router))) | |
1005 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
1006 | ||
1007 | /* Neighbor priority check. */ | |
1008 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
1009 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
1010 | ||
1011 | /* Set neighbor information. */ | |
1012 | nbr->priority = hello->priority; | |
1013 | nbr->d_router = hello->d_router; | |
1014 | nbr->bd_router = hello->bd_router; | |
1015 | } | |
1016 | ||
1017 | /* Save DD flags/options/Seqnum received. */ | |
4dadc291 | 1018 | static void |
718e3744 | 1019 | ospf_db_desc_save_current (struct ospf_neighbor *nbr, |
1020 | struct ospf_db_desc *dd) | |
1021 | { | |
1022 | nbr->last_recv.flags = dd->flags; | |
1023 | nbr->last_recv.options = dd->options; | |
1024 | nbr->last_recv.dd_seqnum = ntohl (dd->dd_seqnum); | |
1025 | } | |
1026 | ||
1027 | /* Process rest of DD packet. */ | |
1028 | static void | |
1029 | ospf_db_desc_proc (struct stream *s, struct ospf_interface *oi, | |
1030 | struct ospf_neighbor *nbr, struct ospf_db_desc *dd, | |
1031 | u_int16_t size) | |
1032 | { | |
1033 | struct ospf_lsa *new, *find; | |
1034 | struct lsa_header *lsah; | |
1035 | ||
9985f83c | 1036 | stream_forward_getp (s, OSPF_DB_DESC_MIN_SIZE); |
718e3744 | 1037 | for (size -= OSPF_DB_DESC_MIN_SIZE; |
1038 | size >= OSPF_LSA_HEADER_SIZE; size -= OSPF_LSA_HEADER_SIZE) | |
1039 | { | |
1040 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
9985f83c | 1041 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 1042 | |
1043 | /* Unknown LS type. */ | |
1044 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
1045 | { | |
bec595ad | 1046 | zlog_warn ("Packet [DD:RECV]: Unknown LS type %d.", lsah->type); |
718e3744 | 1047 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1048 | return; | |
1049 | } | |
1050 | ||
1051 | #ifdef HAVE_OPAQUE_LSA | |
1052 | if (IS_OPAQUE_LSA (lsah->type) | |
1053 | && ! CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1054 | { | |
1055 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1056 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1057 | return; | |
1058 | } | |
1059 | #endif /* HAVE_OPAQUE_LSA */ | |
1060 | ||
1061 | switch (lsah->type) | |
1062 | { | |
1063 | case OSPF_AS_EXTERNAL_LSA: | |
1064 | #ifdef HAVE_OPAQUE_LSA | |
1065 | case OSPF_OPAQUE_AS_LSA: | |
1066 | #endif /* HAVE_OPAQUE_LSA */ | |
718e3744 | 1067 | /* Check for stub area. Reject if AS-External from stub but |
1068 | allow if from NSSA. */ | |
1069 | if (oi->area->external_routing == OSPF_AREA_STUB) | |
718e3744 | 1070 | { |
1071 | zlog_warn ("Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", | |
1072 | lsah->type, inet_ntoa (lsah->id), | |
1073 | (oi->area->external_routing == OSPF_AREA_STUB) ?\ | |
1074 | "STUB" : "NSSA"); | |
1075 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1076 | return; | |
1077 | } | |
1078 | break; | |
1079 | default: | |
1080 | break; | |
1081 | } | |
1082 | ||
1083 | /* Create LS-request object. */ | |
1084 | new = ospf_ls_request_new (lsah); | |
1085 | ||
1086 | /* Lookup received LSA, then add LS request list. */ | |
1087 | find = ospf_lsa_lookup_by_header (oi->area, lsah); | |
f0894cf8 PJ |
1088 | |
1089 | /* ospf_lsa_more_recent is fine with NULL pointers */ | |
1090 | switch (ospf_lsa_more_recent (find, new)) | |
1091 | { | |
1092 | case -1: | |
1093 | /* Neighbour has a more recent LSA, we must request it */ | |
1094 | ospf_ls_request_add (nbr, new); | |
1095 | case 0: | |
1096 | /* If we have a copy of this LSA, it's either less recent | |
1097 | * and we're requesting it from neighbour (the case above), or | |
1098 | * it's as recent and we both have same copy (this case). | |
1099 | * | |
1100 | * In neither of these two cases is there any point in | |
1101 | * describing our copy of the LSA to the neighbour in a | |
1102 | * DB-Summary packet, if we're still intending to do so. | |
1103 | * | |
1104 | * See: draft-ogier-ospf-dbex-opt-00.txt, describing the | |
1105 | * backward compatible optimisation to OSPF DB Exchange / | |
1106 | * DB Description process implemented here. | |
1107 | */ | |
1108 | if (find) | |
1109 | ospf_lsdb_delete (&nbr->db_sum, find); | |
1110 | ospf_lsa_discard (new); | |
1111 | break; | |
1112 | default: | |
1113 | /* We have the more recent copy, nothing specific to do: | |
1114 | * - no need to request neighbours stale copy | |
1115 | * - must leave DB summary list copy alone | |
1116 | */ | |
1117 | if (IS_DEBUG_OSPF_EVENT) | |
1118 | zlog_debug ("Packet [DD:RECV]: LSA received Type %d, " | |
1119 | "ID %s is not recent.", lsah->type, inet_ntoa (lsah->id)); | |
1120 | ospf_lsa_discard (new); | |
1121 | } | |
718e3744 | 1122 | } |
1123 | ||
1124 | /* Master */ | |
1125 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1126 | { | |
1127 | nbr->dd_seqnum++; | |
8dd24ee6 PJ |
1128 | |
1129 | /* Both sides have no More, then we're done with Exchange */ | |
718e3744 | 1130 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) |
1131 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
1132 | else | |
718e3744 | 1133 | ospf_db_desc_send (nbr); |
1134 | } | |
1135 | /* Slave */ | |
1136 | else | |
1137 | { | |
1138 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); | |
1139 | ||
8dd24ee6 PJ |
1140 | /* Send DD packet in reply. |
1141 | * | |
1142 | * Must be done to acknowledge the Master's DD, regardless of | |
1143 | * whether we have more LSAs ourselves to describe. | |
1144 | * | |
1145 | * This function will clear the 'More' bit, if after this DD | |
1146 | * we have no more LSAs to describe to the master.. | |
1147 | */ | |
718e3744 | 1148 | ospf_db_desc_send (nbr); |
8dd24ee6 PJ |
1149 | |
1150 | /* Slave can raise ExchangeDone now, if master is also done */ | |
1151 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) | |
1152 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
718e3744 | 1153 | } |
8dd24ee6 | 1154 | |
718e3744 | 1155 | /* Save received neighbor values from DD. */ |
1156 | ospf_db_desc_save_current (nbr, dd); | |
1157 | } | |
1158 | ||
4dadc291 | 1159 | static int |
718e3744 | 1160 | ospf_db_desc_is_dup (struct ospf_db_desc *dd, struct ospf_neighbor *nbr) |
1161 | { | |
1162 | /* Is DD duplicated? */ | |
1163 | if (dd->options == nbr->last_recv.options && | |
1164 | dd->flags == nbr->last_recv.flags && | |
1165 | dd->dd_seqnum == htonl (nbr->last_recv.dd_seqnum)) | |
1166 | return 1; | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
3aa8d5f9 | 1172 | static void |
718e3744 | 1173 | ospf_db_desc (struct ip *iph, struct ospf_header *ospfh, |
1174 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1175 | { | |
1176 | struct ospf_db_desc *dd; | |
1177 | struct ospf_neighbor *nbr; | |
1178 | ||
1179 | /* Increment statistics. */ | |
1180 | oi->db_desc_in++; | |
1181 | ||
1182 | dd = (struct ospf_db_desc *) STREAM_PNT (s); | |
d363df2c | 1183 | |
d3f0d621 | 1184 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1185 | if (nbr == NULL) |
1186 | { | |
1187 | zlog_warn ("Packet[DD]: Unknown Neighbor %s", | |
1188 | inet_ntoa (ospfh->router_id)); | |
1189 | return; | |
1190 | } | |
1191 | ||
1192 | /* Check MTU. */ | |
ba682537 | 1193 | if ((OSPF_IF_PARAM (oi, mtu_ignore) == 0) && |
1194 | (ntohs (dd->mtu) > oi->ifp->mtu)) | |
718e3744 | 1195 | { |
3aa8d5f9 | 1196 | zlog_warn ("Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", |
1197 | inet_ntoa (nbr->router_id), ntohs (dd->mtu), | |
1198 | IF_NAME (oi), oi->ifp->mtu); | |
718e3744 | 1199 | return; |
1200 | } | |
1201 | ||
d363df2c | 1202 | /* |
1203 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is not | |
1204 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1205 | * Until proper solution is developped, this hack should help. | |
1206 | * | |
1207 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1208 | * options, unfortunately its use in DD options is not specified. Hence some | |
1209 | * implementations follow E-bit semantics and set it in DD options, and some | |
1210 | * treat it as unspecified and hence follow the directive "default for | |
1211 | * options is clear", ie unset. | |
1212 | * | |
1213 | * Reset the flag, as ospfd follows E-bit semantics. | |
1214 | */ | |
1215 | if ( (oi->area->external_routing == OSPF_AREA_NSSA) | |
1216 | && (CHECK_FLAG (nbr->options, OSPF_OPTION_NP)) | |
1217 | && (!CHECK_FLAG (dd->options, OSPF_OPTION_NP)) ) | |
1218 | { | |
1219 | if (IS_DEBUG_OSPF_EVENT) | |
1210fa66 | 1220 | zlog_debug ("Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", |
d363df2c | 1221 | inet_ntoa (nbr->router_id) ); |
1222 | SET_FLAG (dd->options, OSPF_OPTION_NP); | |
1223 | } | |
d363df2c | 1224 | |
718e3744 | 1225 | #ifdef REJECT_IF_TBIT_ON |
1226 | if (CHECK_FLAG (dd->options, OSPF_OPTION_T)) | |
1227 | { | |
1228 | /* | |
1229 | * In Hello protocol, optional capability must have checked | |
1230 | * to prevent this T-bit enabled router be my neighbor. | |
1231 | */ | |
1232 | zlog_warn ("Packet[DD]: Neighbor %s: T-bit on?", inet_ntoa (nbr->router_id)); | |
1233 | return; | |
1234 | } | |
1235 | #endif /* REJECT_IF_TBIT_ON */ | |
1236 | ||
1237 | #ifdef HAVE_OPAQUE_LSA | |
1238 | if (CHECK_FLAG (dd->options, OSPF_OPTION_O) | |
68980084 | 1239 | && !CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1240 | { |
1241 | /* | |
1242 | * This node is not configured to handle O-bit, for now. | |
1243 | * Clear it to ignore unsupported capability proposed by neighbor. | |
1244 | */ | |
1245 | UNSET_FLAG (dd->options, OSPF_OPTION_O); | |
1246 | } | |
1247 | #endif /* HAVE_OPAQUE_LSA */ | |
1248 | ||
57c5c652 PJ |
1249 | /* Add event to thread. */ |
1250 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
1251 | ||
718e3744 | 1252 | /* Process DD packet by neighbor status. */ |
1253 | switch (nbr->state) | |
1254 | { | |
1255 | case NSM_Down: | |
1256 | case NSM_Attempt: | |
1257 | case NSM_TwoWay: | |
bec595ad | 1258 | zlog_warn ("Packet[DD]: Neighbor %s state is %s, packet discarded.", |
3aa8d5f9 | 1259 | inet_ntoa(nbr->router_id), |
718e3744 | 1260 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1261 | break; | |
1262 | case NSM_Init: | |
1263 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived); | |
1264 | /* If the new state is ExStart, the processing of the current | |
1265 | packet should then continue in this new state by falling | |
1266 | through to case ExStart below. */ | |
1267 | if (nbr->state != NSM_ExStart) | |
1268 | break; | |
1269 | case NSM_ExStart: | |
1270 | /* Initial DBD */ | |
1271 | if ((IS_SET_DD_ALL (dd->flags) == OSPF_DD_FLAG_ALL) && | |
1272 | (size == OSPF_DB_DESC_MIN_SIZE)) | |
1273 | { | |
68980084 | 1274 | if (IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) > 0) |
718e3744 | 1275 | { |
1276 | /* We're Slave---obey */ | |
17eaa728 | 1277 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Slave).", |
3aa8d5f9 | 1278 | inet_ntoa(nbr->router_id)); |
718e3744 | 1279 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); |
8dd24ee6 PJ |
1280 | |
1281 | /* Reset I/MS */ | |
1282 | UNSET_FLAG (nbr->dd_flags, (OSPF_DD_FLAG_MS|OSPF_DD_FLAG_I)); | |
718e3744 | 1283 | } |
1284 | else | |
1285 | { | |
1286 | /* We're Master, ignore the initial DBD from Slave */ | |
6d45276f | 1287 | zlog_info ("Packet[DD]: Neighbor %s: Initial DBD from Slave, " |
3aa8d5f9 | 1288 | "ignoring.", inet_ntoa(nbr->router_id)); |
718e3744 | 1289 | break; |
1290 | } | |
1291 | } | |
1292 | /* Ack from the Slave */ | |
1293 | else if (!IS_SET_DD_MS (dd->flags) && !IS_SET_DD_I (dd->flags) && | |
1294 | ntohl (dd->dd_seqnum) == nbr->dd_seqnum && | |
68980084 | 1295 | IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) < 0) |
718e3744 | 1296 | { |
17eaa728 | 1297 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Master).", |
3aa8d5f9 | 1298 | inet_ntoa(nbr->router_id)); |
8dd24ee6 PJ |
1299 | /* Reset I, leaving MS */ |
1300 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_I); | |
718e3744 | 1301 | } |
1302 | else | |
1303 | { | |
3aa8d5f9 | 1304 | zlog_warn ("Packet[DD]: Neighbor %s Negotiation fails.", |
1305 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1306 | break; |
1307 | } | |
1308 | ||
1309 | /* This is where the real Options are saved */ | |
1310 | nbr->options = dd->options; | |
1311 | ||
1312 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 1313 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1314 | { |
1315 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1316 | zlog_debug ("Neighbor[%s] is %sOpaque-capable.", |
718e3744 | 1317 | inet_ntoa (nbr->router_id), |
1318 | CHECK_FLAG (nbr->options, OSPF_OPTION_O) ? "" : "NOT "); | |
1319 | ||
1320 | if (! CHECK_FLAG (nbr->options, OSPF_OPTION_O) | |
1321 | && IPV4_ADDR_SAME (&DR (oi), &nbr->address.u.prefix4)) | |
1322 | { | |
6d45276f | 1323 | zlog_warn ("DR-neighbor[%s] is NOT opaque-capable; " |
1324 | "Opaque-LSAs cannot be reliably advertised " | |
1325 | "in this network.", | |
1326 | inet_ntoa (nbr->router_id)); | |
718e3744 | 1327 | /* This situation is undesirable, but not a real error. */ |
1328 | } | |
1329 | } | |
1330 | #endif /* HAVE_OPAQUE_LSA */ | |
1331 | ||
1332 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_NegotiationDone); | |
1333 | ||
1334 | /* continue processing rest of packet. */ | |
1335 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1336 | break; | |
1337 | case NSM_Exchange: | |
1338 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1339 | { | |
1340 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1341 | /* Master: discard duplicated DD packet. */ | |
6d45276f | 1342 | zlog_info ("Packet[DD] (Master): Neighbor %s packet duplicated.", |
3aa8d5f9 | 1343 | inet_ntoa (nbr->router_id)); |
718e3744 | 1344 | else |
1345 | /* Slave: cause to retransmit the last Database Description. */ | |
1346 | { | |
6d45276f | 1347 | zlog_info ("Packet[DD] [Slave]: Neighbor %s packet duplicated.", |
3aa8d5f9 | 1348 | inet_ntoa (nbr->router_id)); |
718e3744 | 1349 | ospf_db_desc_resend (nbr); |
1350 | } | |
1351 | break; | |
1352 | } | |
1353 | ||
1354 | /* Otherwise DD packet should be checked. */ | |
1355 | /* Check Master/Slave bit mismatch */ | |
1356 | if (IS_SET_DD_MS (dd->flags) != IS_SET_DD_MS (nbr->last_recv.flags)) | |
1357 | { | |
3aa8d5f9 | 1358 | zlog_warn ("Packet[DD]: Neighbor %s MS-bit mismatch.", |
1359 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1360 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1361 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1362 | zlog_debug ("Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", |
3aa8d5f9 | 1363 | dd->flags, nbr->dd_flags); |
718e3744 | 1364 | break; |
1365 | } | |
1366 | ||
1367 | /* Check initialize bit is set. */ | |
1368 | if (IS_SET_DD_I (dd->flags)) | |
1369 | { | |
6d45276f | 1370 | zlog_info ("Packet[DD]: Neighbor %s I-bit set.", |
3aa8d5f9 | 1371 | inet_ntoa(nbr->router_id)); |
718e3744 | 1372 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1373 | break; | |
1374 | } | |
1375 | ||
1376 | /* Check DD Options. */ | |
1377 | if (dd->options != nbr->options) | |
1378 | { | |
1379 | #ifdef ORIGINAL_CODING | |
1380 | /* Save the new options for debugging */ | |
1381 | nbr->options = dd->options; | |
1382 | #endif /* ORIGINAL_CODING */ | |
3aa8d5f9 | 1383 | zlog_warn ("Packet[DD]: Neighbor %s options mismatch.", |
1384 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1385 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1386 | break; | |
1387 | } | |
1388 | ||
1389 | /* Check DD sequence number. */ | |
1390 | if ((IS_SET_DD_MS (nbr->dd_flags) && | |
1391 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum) || | |
1392 | (!IS_SET_DD_MS (nbr->dd_flags) && | |
1393 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum + 1)) | |
1394 | { | |
3aa8d5f9 | 1395 | zlog_warn ("Packet[DD]: Neighbor %s sequence number mismatch.", |
1396 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1397 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1398 | break; | |
1399 | } | |
1400 | ||
1401 | /* Continue processing rest of packet. */ | |
1402 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1403 | break; | |
1404 | case NSM_Loading: | |
1405 | case NSM_Full: | |
1406 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1407 | { | |
1408 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1409 | { | |
1410 | /* Master should discard duplicate DD packet. */ | |
6d45276f | 1411 | zlog_info ("Packet[DD]: Neighbor %s duplicated, " |
1412 | "packet discarded.", | |
3aa8d5f9 | 1413 | inet_ntoa(nbr->router_id)); |
718e3744 | 1414 | break; |
1415 | } | |
1416 | else | |
1417 | { | |
1418 | struct timeval t, now; | |
2518efd1 | 1419 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &now); |
718e3744 | 1420 | t = tv_sub (now, nbr->last_send_ts); |
1421 | if (tv_cmp (t, int2tv (nbr->v_inactivity)) < 0) | |
1422 | { | |
1423 | /* In states Loading and Full the slave must resend | |
1424 | its last Database Description packet in response to | |
1425 | duplicate Database Description packets received | |
1426 | from the master. For this reason the slave must | |
1427 | wait RouterDeadInterval seconds before freeing the | |
1428 | last Database Description packet. Reception of a | |
1429 | Database Description packet from the master after | |
1430 | this interval will generate a SeqNumberMismatch | |
1431 | neighbor event. RFC2328 Section 10.8 */ | |
1432 | ospf_db_desc_resend (nbr); | |
1433 | break; | |
1434 | } | |
1435 | } | |
1436 | } | |
1437 | ||
1438 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1439 | break; | |
1440 | default: | |
3aa8d5f9 | 1441 | zlog_warn ("Packet[DD]: Neighbor %s NSM illegal status %u.", |
1442 | inet_ntoa(nbr->router_id), nbr->state); | |
718e3744 | 1443 | break; |
1444 | } | |
1445 | } | |
1446 | ||
1447 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1448 | ||
1449 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
4dadc291 | 1450 | static void |
718e3744 | 1451 | ospf_ls_req (struct ip *iph, struct ospf_header *ospfh, |
1452 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1453 | { | |
1454 | struct ospf_neighbor *nbr; | |
1455 | u_int32_t ls_type; | |
1456 | struct in_addr ls_id; | |
1457 | struct in_addr adv_router; | |
1458 | struct ospf_lsa *find; | |
52dc7ee6 | 1459 | struct list *ls_upd; |
6c835671 | 1460 | unsigned int length; |
718e3744 | 1461 | |
1462 | /* Increment statistics. */ | |
1463 | oi->ls_req_in++; | |
1464 | ||
d3f0d621 | 1465 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1466 | if (nbr == NULL) |
1467 | { | |
1468 | zlog_warn ("Link State Request: Unknown Neighbor %s.", | |
1469 | inet_ntoa (ospfh->router_id)); | |
1470 | return; | |
1471 | } | |
1472 | ||
57c5c652 PJ |
1473 | /* Add event to thread. */ |
1474 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
1475 | ||
718e3744 | 1476 | /* Neighbor State should be Exchange or later. */ |
1477 | if (nbr->state != NSM_Exchange && | |
1478 | nbr->state != NSM_Loading && | |
1479 | nbr->state != NSM_Full) | |
1480 | { | |
bec595ad | 1481 | zlog_warn ("Link State Request received from %s: " |
1482 | "Neighbor state is %s, packet discarded.", | |
1483 | inet_ntoa (ospfh->router_id), | |
718e3744 | 1484 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1485 | return; | |
1486 | } | |
1487 | ||
1488 | /* Send Link State Update for ALL requested LSAs. */ | |
1489 | ls_upd = list_new (); | |
1490 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1491 | ||
1492 | while (size >= OSPF_LSA_KEY_SIZE) | |
1493 | { | |
1494 | /* Get one slice of Link State Request. */ | |
1495 | ls_type = stream_getl (s); | |
1496 | ls_id.s_addr = stream_get_ipv4 (s); | |
1497 | adv_router.s_addr = stream_get_ipv4 (s); | |
1498 | ||
1499 | /* Verify LSA type. */ | |
1500 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) | |
1501 | { | |
1502 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1503 | list_delete (ls_upd); | |
1504 | return; | |
1505 | } | |
1506 | ||
1507 | /* Search proper LSA in LSDB. */ | |
1508 | find = ospf_lsa_lookup (oi->area, ls_type, ls_id, adv_router); | |
1509 | if (find == NULL) | |
1510 | { | |
1511 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1512 | list_delete (ls_upd); | |
1513 | return; | |
1514 | } | |
1515 | ||
86f1fd96 | 1516 | /* Packet overflows MTU size, send immediately. */ |
1517 | if (length + ntohs (find->data->length) > ospf_packet_max (oi)) | |
718e3744 | 1518 | { |
1519 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1520 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1521 | else | |
1522 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1523 | ||
1524 | /* Only remove list contents. Keep ls_upd. */ | |
1525 | list_delete_all_node (ls_upd); | |
1526 | ||
1527 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1528 | } | |
1529 | ||
1530 | /* Append LSA to update list. */ | |
1531 | listnode_add (ls_upd, find); | |
1532 | length += ntohs (find->data->length); | |
1533 | ||
1534 | size -= OSPF_LSA_KEY_SIZE; | |
1535 | } | |
1536 | ||
1537 | /* Send rest of Link State Update. */ | |
1538 | if (listcount (ls_upd) > 0) | |
1539 | { | |
1540 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1541 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1542 | else | |
1543 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1544 | ||
1545 | list_delete (ls_upd); | |
1546 | } | |
1547 | else | |
1548 | list_free (ls_upd); | |
1549 | } | |
1550 | ||
1551 | /* Get the list of LSAs from Link State Update packet. | |
1552 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
52dc7ee6 | 1553 | static struct list * |
718e3744 | 1554 | ospf_ls_upd_list_lsa (struct ospf_neighbor *nbr, struct stream *s, |
1555 | struct ospf_interface *oi, size_t size) | |
1556 | { | |
1557 | u_int16_t count, sum; | |
1558 | u_int32_t length; | |
1559 | struct lsa_header *lsah; | |
1560 | struct ospf_lsa *lsa; | |
52dc7ee6 | 1561 | struct list *lsas; |
718e3744 | 1562 | |
1563 | lsas = list_new (); | |
1564 | ||
1565 | count = stream_getl (s); | |
1566 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1567 | ||
1568 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
9985f83c | 1569 | size -= length, stream_forward_getp (s, length), count--) |
718e3744 | 1570 | { |
1571 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
1572 | length = ntohs (lsah->length); | |
1573 | ||
1574 | if (length > size) | |
1575 | { | |
1576 | zlog_warn ("Link State Update: LSA length exceeds packet size."); | |
1577 | break; | |
1578 | } | |
1579 | ||
1580 | /* Validate the LSA's LS checksum. */ | |
1581 | sum = lsah->checksum; | |
1582 | if (sum != ospf_lsa_checksum (lsah)) | |
1583 | { | |
223da1a9 JF |
1584 | /* (bug #685) more details in a one-line message make it possible |
1585 | * to identify problem source on the one hand and to have a better | |
1586 | * chance to compress repeated messages in syslog on the other */ | |
1587 | zlog_warn ("Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s", | |
1588 | sum, lsah->checksum, inet_ntoa (lsah->id), | |
1589 | inet_ntoa (nbr->src), inet_ntoa (nbr->router_id), | |
1590 | inet_ntoa (lsah->adv_router)); | |
718e3744 | 1591 | continue; |
1592 | } | |
1593 | ||
1594 | /* Examine the LSA's LS type. */ | |
1595 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
1596 | { | |
1597 | zlog_warn ("Link State Update: Unknown LS type %d", lsah->type); | |
1598 | continue; | |
1599 | } | |
1600 | ||
1601 | /* | |
1602 | * What if the received LSA's age is greater than MaxAge? | |
1603 | * Treat it as a MaxAge case -- endo. | |
1604 | */ | |
1605 | if (ntohs (lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1606 | lsah->ls_age = htons (OSPF_LSA_MAXAGE); | |
1607 | ||
1608 | #ifdef HAVE_OPAQUE_LSA | |
1609 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1610 | { | |
1611 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1612 | if ((IS_OPAQUE_LSA(lsah->type) && | |
1613 | ! CHECK_FLAG (lsah->options, OSPF_OPTION_O)) | |
1614 | || (! IS_OPAQUE_LSA(lsah->type) && | |
1615 | CHECK_FLAG (lsah->options, OSPF_OPTION_O))) | |
1616 | { | |
1617 | /* | |
1618 | * This neighbor must know the exact usage of O-bit; | |
1619 | * the bit will be set in Type-9,10,11 LSAs only. | |
1620 | */ | |
1621 | zlog_warn ("LSA[Type%d:%s]: O-bit abuse?", lsah->type, inet_ntoa (lsah->id)); | |
1622 | continue; | |
1623 | } | |
1624 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
1625 | ||
1626 | /* Do not take in AS External Opaque-LSAs if we are a stub. */ | |
1627 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1628 | && nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1629 | { | |
1630 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1631 | zlog_debug ("LSA[Type%d:%s]: We are a stub, don't take this LSA.", lsah->type, inet_ntoa (lsah->id)); |
718e3744 | 1632 | continue; |
1633 | } | |
1634 | } | |
1635 | else if (IS_OPAQUE_LSA(lsah->type)) | |
1636 | { | |
1637 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1638 | continue; | |
1639 | } | |
1640 | #endif /* HAVE_OPAQUE_LSA */ | |
1641 | ||
1642 | /* Create OSPF LSA instance. */ | |
1643 | lsa = ospf_lsa_new (); | |
1644 | ||
1645 | /* We may wish to put some error checking if type NSSA comes in | |
1646 | and area not in NSSA mode */ | |
1647 | switch (lsah->type) | |
1648 | { | |
1649 | case OSPF_AS_EXTERNAL_LSA: | |
1650 | #ifdef HAVE_OPAQUE_LSA | |
1651 | case OSPF_OPAQUE_AS_LSA: | |
1652 | lsa->area = NULL; | |
1653 | break; | |
1654 | case OSPF_OPAQUE_LINK_LSA: | |
1655 | lsa->oi = oi; /* Remember incoming interface for flooding control. */ | |
1656 | /* Fallthrough */ | |
1657 | #endif /* HAVE_OPAQUE_LSA */ | |
1658 | default: | |
1659 | lsa->area = oi->area; | |
1660 | break; | |
1661 | } | |
1662 | ||
1663 | lsa->data = ospf_lsa_data_new (length); | |
1664 | memcpy (lsa->data, lsah, length); | |
1665 | ||
1666 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1667 | zlog_debug("LSA[Type%d:%s]: %p new LSA created with Link State Update", |
718e3744 | 1668 | lsa->data->type, inet_ntoa (lsa->data->id), lsa); |
1669 | listnode_add (lsas, lsa); | |
1670 | } | |
1671 | ||
1672 | return lsas; | |
1673 | } | |
1674 | ||
1675 | /* Cleanup Update list. */ | |
4dadc291 | 1676 | static void |
52dc7ee6 | 1677 | ospf_upd_list_clean (struct list *lsas) |
718e3744 | 1678 | { |
1eb8ef25 | 1679 | struct listnode *node, *nnode; |
718e3744 | 1680 | struct ospf_lsa *lsa; |
1681 | ||
1eb8ef25 | 1682 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
1683 | ospf_lsa_discard (lsa); | |
718e3744 | 1684 | |
1685 | list_delete (lsas); | |
1686 | } | |
1687 | ||
1688 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
4dadc291 | 1689 | static void |
718e3744 | 1690 | ospf_ls_upd (struct ip *iph, struct ospf_header *ospfh, |
1691 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1692 | { | |
1693 | struct ospf_neighbor *nbr; | |
52dc7ee6 | 1694 | struct list *lsas; |
1eb8ef25 | 1695 | struct listnode *node, *nnode; |
718e3744 | 1696 | struct ospf_lsa *lsa = NULL; |
1697 | /* unsigned long ls_req_found = 0; */ | |
1698 | ||
1699 | /* Dis-assemble the stream, update each entry, re-encapsulate for flooding */ | |
1700 | ||
1701 | /* Increment statistics. */ | |
1702 | oi->ls_upd_in++; | |
1703 | ||
1704 | /* Check neighbor. */ | |
d3f0d621 | 1705 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1706 | if (nbr == NULL) |
1707 | { | |
1708 | zlog_warn ("Link State Update: Unknown Neighbor %s on int: %s", | |
1709 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); | |
1710 | return; | |
1711 | } | |
1712 | ||
57c5c652 PJ |
1713 | /* Add event to thread. */ |
1714 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
1715 | ||
718e3744 | 1716 | /* Check neighbor state. */ |
1717 | if (nbr->state < NSM_Exchange) | |
1718 | { | |
3aa8d5f9 | 1719 | zlog_warn ("Link State Update: " |
1720 | "Neighbor[%s] state %s is less than Exchange", | |
1721 | inet_ntoa (ospfh->router_id), | |
1722 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 1723 | return; |
1724 | } | |
1725 | ||
1726 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages | |
1727 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1728 | * of section 13. | |
1729 | */ | |
1730 | lsas = ospf_ls_upd_list_lsa (nbr, s, oi, size); | |
1731 | ||
1732 | #ifdef HAVE_OPAQUE_LSA | |
718e3744 | 1733 | /* |
1734 | * If self-originated Opaque-LSAs that have flooded before restart | |
1735 | * are contained in the received LSUpd message, corresponding LSReq | |
1736 | * messages to be sent may have to be modified. | |
1737 | * To eliminate possible race conditions such that flushing and normal | |
1738 | * updating for the same LSA would take place alternately, this trick | |
1739 | * must be done before entering to the loop below. | |
1740 | */ | |
69310a67 | 1741 | /* XXX: Why is this Opaque specific? Either our core code is deficient |
1742 | * and this should be fixed generally, or Opaque is inventing strawman | |
1743 | * problems */ | |
718e3744 | 1744 | ospf_opaque_adjust_lsreq (nbr, lsas); |
1745 | #endif /* HAVE_OPAQUE_LSA */ | |
1746 | ||
1747 | #define DISCARD_LSA(L,N) {\ | |
1748 | if (IS_DEBUG_OSPF_EVENT) \ | |
2a42e285 | 1749 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p Type-%d", N, lsa, (int) lsa->data->type); \ |
718e3744 | 1750 | ospf_lsa_discard (L); \ |
1751 | continue; } | |
1752 | ||
1753 | /* Process each LSA received in the one packet. */ | |
1eb8ef25 | 1754 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
718e3744 | 1755 | { |
1756 | struct ospf_lsa *ls_ret, *current; | |
1757 | int ret = 1; | |
1758 | ||
718e3744 | 1759 | if (IS_DEBUG_OSPF_NSSA) |
1760 | { | |
1761 | char buf1[INET_ADDRSTRLEN]; | |
1762 | char buf2[INET_ADDRSTRLEN]; | |
1763 | char buf3[INET_ADDRSTRLEN]; | |
1764 | ||
2a42e285 | 1765 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", |
718e3744 | 1766 | lsa->data->type, |
1767 | inet_ntop (AF_INET, &ospfh->router_id, | |
1768 | buf1, INET_ADDRSTRLEN), | |
1769 | inet_ntop (AF_INET, &lsa->data->id, | |
1770 | buf2, INET_ADDRSTRLEN), | |
1771 | inet_ntop (AF_INET, &lsa->data->adv_router, | |
1772 | buf3, INET_ADDRSTRLEN)); | |
1773 | } | |
718e3744 | 1774 | |
1775 | listnode_delete (lsas, lsa); /* We don't need it in list anymore */ | |
1776 | ||
1777 | /* Validate Checksum - Done above by ospf_ls_upd_list_lsa() */ | |
1778 | ||
1779 | /* LSA Type - Done above by ospf_ls_upd_list_lsa() */ | |
1780 | ||
1781 | /* Do not take in AS External LSAs if we are a stub or NSSA. */ | |
1782 | ||
1783 | /* Do not take in AS NSSA if this neighbor and we are not NSSA */ | |
1784 | ||
1785 | /* Do take in Type-7's if we are an NSSA */ | |
1786 | ||
1787 | /* If we are also an ABR, later translate them to a Type-5 packet */ | |
1788 | ||
1789 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1790 | translate them to a separate Type-5 packet. */ | |
1791 | ||
1792 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1793 | /* Reject from STUB or NSSA */ | |
1794 | if (nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1795 | { | |
718e3744 | 1796 | if (IS_DEBUG_OSPF_NSSA) |
2a42e285 | 1797 | zlog_debug("Incoming External LSA Discarded: We are NSSA/STUB Area"); |
2cd754de | 1798 | DISCARD_LSA (lsa, 1); |
718e3744 | 1799 | } |
1800 | ||
718e3744 | 1801 | if (lsa->data->type == OSPF_AS_NSSA_LSA) |
1802 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) | |
1803 | { | |
718e3744 | 1804 | if (IS_DEBUG_OSPF_NSSA) |
2a42e285 | 1805 | zlog_debug("Incoming NSSA LSA Discarded: Not NSSA Area"); |
2cd754de | 1806 | DISCARD_LSA (lsa,2); |
718e3744 | 1807 | } |
718e3744 | 1808 | |
1809 | /* Find the LSA in the current database. */ | |
1810 | ||
1811 | current = ospf_lsa_lookup_by_header (oi->area, lsa->data); | |
1812 | ||
1813 | /* If the LSA's LS age is equal to MaxAge, and there is currently | |
1814 | no instance of the LSA in the router's link state database, | |
1815 | and none of router's neighbors are in states Exchange or Loading, | |
1816 | then take the following actions. */ | |
1817 | ||
1818 | if (IS_LSA_MAXAGE (lsa) && !current && | |
68980084 | 1819 | (ospf_nbr_count (oi, NSM_Exchange) + |
1820 | ospf_nbr_count (oi, NSM_Loading)) == 0) | |
718e3744 | 1821 | { |
1822 | /* Response Link State Acknowledgment. */ | |
1823 | ospf_ls_ack_send (nbr, lsa); | |
1824 | ||
1825 | /* Discard LSA. */ | |
6d45276f | 1826 | zlog_info ("Link State Update[%s]: LS age is equal to MaxAge.", |
1827 | dump_lsa_key(lsa)); | |
718e3744 | 1828 | DISCARD_LSA (lsa, 3); |
1829 | } | |
1830 | ||
1831 | #ifdef HAVE_OPAQUE_LSA | |
1832 | if (IS_OPAQUE_LSA (lsa->data->type) | |
68980084 | 1833 | && IPV4_ADDR_SAME (&lsa->data->adv_router, &oi->ospf->router_id)) |
718e3744 | 1834 | { |
1835 | /* | |
1836 | * Even if initial flushing seems to be completed, there might | |
1837 | * be a case that self-originated LSA with MaxAge still remain | |
1838 | * in the routing domain. | |
1839 | * Just send an LSAck message to cease retransmission. | |
1840 | */ | |
1841 | if (IS_LSA_MAXAGE (lsa)) | |
1842 | { | |
1843 | zlog_warn ("LSA[%s]: Boomerang effect?", dump_lsa_key (lsa)); | |
1844 | ospf_ls_ack_send (nbr, lsa); | |
1845 | ospf_lsa_discard (lsa); | |
1846 | ||
1847 | if (current != NULL && ! IS_LSA_MAXAGE (current)) | |
1848 | ospf_opaque_lsa_refresh_schedule (current); | |
1849 | continue; | |
1850 | } | |
1851 | ||
1852 | /* | |
1853 | * If an instance of self-originated Opaque-LSA is not found | |
1854 | * in the LSDB, there are some possible cases here. | |
1855 | * | |
1856 | * 1) This node lost opaque-capability after restart. | |
1857 | * 2) Else, a part of opaque-type is no more supported. | |
1858 | * 3) Else, a part of opaque-id is no more supported. | |
1859 | * | |
1860 | * Anyway, it is still this node's responsibility to flush it. | |
1861 | * Otherwise, the LSA instance remains in the routing domain | |
1862 | * until its age reaches to MaxAge. | |
1863 | */ | |
69310a67 | 1864 | /* XXX: We should deal with this for *ALL* LSAs, not just opaque */ |
718e3744 | 1865 | if (current == NULL) |
1866 | { | |
1867 | if (IS_DEBUG_OSPF_EVENT) | |
69310a67 | 1868 | zlog_debug ("LSA[%s]: Previously originated Opaque-LSA," |
1869 | "not found in the LSDB.", dump_lsa_key (lsa)); | |
718e3744 | 1870 | |
1871 | SET_FLAG (lsa->flags, OSPF_LSA_SELF); | |
69310a67 | 1872 | |
1873 | ospf_opaque_self_originated_lsa_received (nbr, lsa); | |
1874 | ospf_ls_ack_send (nbr, lsa); | |
1875 | ||
718e3744 | 1876 | continue; |
1877 | } | |
1878 | } | |
1879 | #endif /* HAVE_OPAQUE_LSA */ | |
69310a67 | 1880 | |
cb05eb28 | 1881 | /* It might be happen that received LSA is self-originated network LSA, but |
1882 | * router ID is cahnged. So, we should check if LSA is a network-LSA whose | |
1883 | * Link State ID is one of the router's own IP interface addresses but whose | |
1884 | * Advertising Router is not equal to the router's own Router ID | |
1885 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be flushed. | |
1886 | */ | |
1887 | ||
1888 | if(lsa->data->type == OSPF_NETWORK_LSA) | |
1889 | { | |
1eb8ef25 | 1890 | struct listnode *oinode, *oinnode; |
1891 | struct ospf_interface *out_if; | |
cb05eb28 | 1892 | int Flag = 0; |
1893 | ||
1eb8ef25 | 1894 | for (ALL_LIST_ELEMENTS (oi->ospf->oiflist, oinode, oinnode, out_if)) |
cb05eb28 | 1895 | { |
cb05eb28 | 1896 | if(out_if == NULL) |
1897 | break; | |
1898 | ||
1899 | if((IPV4_ADDR_SAME(&out_if->address->u.prefix4, &lsa->data->id)) && | |
1900 | (!(IPV4_ADDR_SAME(&oi->ospf->router_id, &lsa->data->adv_router)))) | |
1901 | { | |
1902 | if(out_if->network_lsa_self) | |
1903 | { | |
1904 | ospf_lsa_flush_area(lsa,out_if->area); | |
1905 | if(IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1906 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", |
cb05eb28 | 1907 | lsa, (int) lsa->data->type); |
1908 | ospf_lsa_discard (lsa); | |
1909 | Flag = 1; | |
1910 | } | |
1911 | break; | |
1912 | } | |
1913 | } | |
1914 | if(Flag) | |
1915 | continue; | |
1916 | } | |
718e3744 | 1917 | |
1918 | /* (5) Find the instance of this LSA that is currently contained | |
1919 | in the router's link state database. If there is no | |
1920 | database copy, or the received LSA is more recent than | |
1921 | the database copy the following steps must be performed. */ | |
1922 | ||
1923 | if (current == NULL || | |
1924 | (ret = ospf_lsa_more_recent (current, lsa)) < 0) | |
1925 | { | |
1926 | /* Actual flooding procedure. */ | |
68980084 | 1927 | if (ospf_flood (oi->ospf, nbr, current, lsa) < 0) /* Trap NSSA later. */ |
718e3744 | 1928 | DISCARD_LSA (lsa, 4); |
1929 | continue; | |
1930 | } | |
1931 | ||
1932 | /* (6) Else, If there is an instance of the LSA on the sending | |
1933 | neighbor's Link state request list, an error has occurred in | |
1934 | the Database Exchange process. In this case, restart the | |
1935 | Database Exchange process by generating the neighbor event | |
1936 | BadLSReq for the sending neighbor and stop processing the | |
1937 | Link State Update packet. */ | |
1938 | ||
1939 | if (ospf_ls_request_lookup (nbr, lsa)) | |
1940 | { | |
1941 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
3aa8d5f9 | 1942 | zlog_warn("LSA[%s] instance exists on Link state request list", |
1943 | dump_lsa_key(lsa)); | |
718e3744 | 1944 | |
1945 | /* Clean list of LSAs. */ | |
1946 | ospf_upd_list_clean (lsas); | |
1947 | /* this lsa is not on lsas list already. */ | |
1948 | ospf_lsa_discard (lsa); | |
718e3744 | 1949 | return; |
1950 | } | |
1951 | ||
1952 | /* If the received LSA is the same instance as the database copy | |
1953 | (i.e., neither one is more recent) the following two steps | |
1954 | should be performed: */ | |
1955 | ||
1956 | if (ret == 0) | |
1957 | { | |
1958 | /* If the LSA is listed in the Link state retransmission list | |
1959 | for the receiving adjacency, the router itself is expecting | |
1960 | an acknowledgment for this LSA. The router should treat the | |
1961 | received LSA as an acknowledgment by removing the LSA from | |
1962 | the Link state retransmission list. This is termed an | |
1963 | "implied acknowledgment". */ | |
1964 | ||
1965 | ls_ret = ospf_ls_retransmit_lookup (nbr, lsa); | |
1966 | ||
1967 | if (ls_ret != NULL) | |
1968 | { | |
1969 | ospf_ls_retransmit_delete (nbr, ls_ret); | |
1970 | ||
1971 | /* Delayed acknowledgment sent if advertisement received | |
1972 | from Designated Router, otherwise do nothing. */ | |
1973 | if (oi->state == ISM_Backup) | |
1974 | if (NBR_IS_DR (nbr)) | |
1975 | listnode_add (oi->ls_ack, ospf_lsa_lock (lsa)); | |
1976 | ||
1977 | DISCARD_LSA (lsa, 5); | |
1978 | } | |
1979 | else | |
1980 | /* Acknowledge the receipt of the LSA by sending a | |
1981 | Link State Acknowledgment packet back out the receiving | |
1982 | interface. */ | |
1983 | { | |
1984 | ospf_ls_ack_send (nbr, lsa); | |
1985 | DISCARD_LSA (lsa, 6); | |
1986 | } | |
1987 | } | |
1988 | ||
1989 | /* The database copy is more recent. If the database copy | |
1990 | has LS age equal to MaxAge and LS sequence number equal to | |
1991 | MaxSequenceNumber, simply discard the received LSA without | |
1992 | acknowledging it. (In this case, the LSA's LS sequence number is | |
1993 | wrapping, and the MaxSequenceNumber LSA must be completely | |
1994 | flushed before any new LSA instance can be introduced). */ | |
1995 | ||
1996 | else if (ret > 0) /* Database copy is more recent */ | |
1997 | { | |
1998 | if (IS_LSA_MAXAGE (current) && | |
1999 | current->data->ls_seqnum == htonl (OSPF_MAX_SEQUENCE_NUMBER)) | |
2000 | { | |
2001 | DISCARD_LSA (lsa, 7); | |
2002 | } | |
2003 | /* Otherwise, as long as the database copy has not been sent in a | |
2004 | Link State Update within the last MinLSArrival seconds, send the | |
2005 | database copy back to the sending neighbor, encapsulated within | |
2006 | a Link State Update Packet. The Link State Update Packet should | |
2007 | be sent directly to the neighbor. In so doing, do not put the | |
2008 | database copy of the LSA on the neighbor's link state | |
2009 | retransmission list, and do not acknowledge the received (less | |
2010 | recent) LSA instance. */ | |
2011 | else | |
2012 | { | |
2013 | struct timeval now; | |
2014 | ||
2518efd1 | 2015 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &now); |
718e3744 | 2016 | |
2017 | if (tv_cmp (tv_sub (now, current->tv_orig), | |
2c9f8e36 | 2018 | int2tv (OSPF_MIN_LS_ARRIVAL)) >= 0) |
718e3744 | 2019 | /* Trap NSSA type later.*/ |
2020 | ospf_ls_upd_send_lsa (nbr, current, OSPF_SEND_PACKET_DIRECT); | |
2021 | DISCARD_LSA (lsa, 8); | |
2022 | } | |
2023 | } | |
2024 | } | |
2cd754de PJ |
2025 | #undef DISCARD_LSA |
2026 | ||
718e3744 | 2027 | assert (listcount (lsas) == 0); |
2028 | list_delete (lsas); | |
2029 | } | |
2030 | ||
2031 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
4dadc291 | 2032 | static void |
718e3744 | 2033 | ospf_ls_ack (struct ip *iph, struct ospf_header *ospfh, |
2034 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
2035 | { | |
2036 | struct ospf_neighbor *nbr; | |
69310a67 | 2037 | |
718e3744 | 2038 | /* increment statistics. */ |
2039 | oi->ls_ack_in++; | |
2040 | ||
d3f0d621 | 2041 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 2042 | if (nbr == NULL) |
2043 | { | |
2044 | zlog_warn ("Link State Acknowledgment: Unknown Neighbor %s.", | |
2045 | inet_ntoa (ospfh->router_id)); | |
2046 | return; | |
2047 | } | |
2048 | ||
57c5c652 PJ |
2049 | /* Add event to thread. */ |
2050 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
2051 | ||
718e3744 | 2052 | if (nbr->state < NSM_Exchange) |
2053 | { | |
3aa8d5f9 | 2054 | zlog_warn ("Link State Acknowledgment: " |
2055 | "Neighbor[%s] state %s is less than Exchange", | |
2056 | inet_ntoa (ospfh->router_id), | |
2057 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 2058 | return; |
2059 | } | |
69310a67 | 2060 | |
718e3744 | 2061 | while (size >= OSPF_LSA_HEADER_SIZE) |
2062 | { | |
2063 | struct ospf_lsa *lsa, *lsr; | |
2064 | ||
2065 | lsa = ospf_lsa_new (); | |
2066 | lsa->data = (struct lsa_header *) STREAM_PNT (s); | |
2067 | ||
2068 | /* lsah = (struct lsa_header *) STREAM_PNT (s); */ | |
2069 | size -= OSPF_LSA_HEADER_SIZE; | |
9985f83c | 2070 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 2071 | |
2072 | if (lsa->data->type < OSPF_MIN_LSA || lsa->data->type >= OSPF_MAX_LSA) | |
2073 | { | |
2074 | lsa->data = NULL; | |
2075 | ospf_lsa_discard (lsa); | |
2076 | continue; | |
2077 | } | |
2078 | ||
2079 | lsr = ospf_ls_retransmit_lookup (nbr, lsa); | |
2080 | ||
2081 | if (lsr != NULL && lsr->data->ls_seqnum == lsa->data->ls_seqnum) | |
2082 | { | |
2083 | #ifdef HAVE_OPAQUE_LSA | |
718e3744 | 2084 | if (IS_OPAQUE_LSA (lsr->data->type)) |
69310a67 | 2085 | ospf_opaque_ls_ack_received (nbr, lsr); |
718e3744 | 2086 | #endif /* HAVE_OPAQUE_LSA */ |
2087 | ||
2088 | ospf_ls_retransmit_delete (nbr, lsr); | |
2089 | } | |
2090 | ||
2091 | lsa->data = NULL; | |
2092 | ospf_lsa_discard (lsa); | |
2093 | } | |
2094 | ||
718e3744 | 2095 | return; |
718e3744 | 2096 | } |
2097 | \f | |
038163fa | 2098 | static struct stream * |
5c33349b | 2099 | ospf_recv_packet (int fd, struct interface **ifp, struct stream *ibuf) |
718e3744 | 2100 | { |
2101 | int ret; | |
5c33349b | 2102 | struct ip *iph; |
718e3744 | 2103 | u_int16_t ip_len; |
718e3744 | 2104 | unsigned int ifindex = 0; |
2105 | struct iovec iov; | |
d0deca68 | 2106 | /* Header and data both require alignment. */ |
e304982e | 2107 | char buff [CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; |
2dd8bb4e | 2108 | struct msghdr msgh; |
2109 | ||
68defd6d | 2110 | memset (&msgh, 0, sizeof (struct msghdr)); |
2dd8bb4e | 2111 | msgh.msg_iov = &iov; |
2112 | msgh.msg_iovlen = 1; | |
2113 | msgh.msg_control = (caddr_t) buff; | |
2114 | msgh.msg_controllen = sizeof (buff); | |
2dd8bb4e | 2115 | |
5c33349b | 2116 | ret = stream_recvmsg (ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE+1); |
2117 | if (ret < 0) | |
718e3744 | 2118 | { |
5c33349b | 2119 | zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno)); |
2120 | return NULL; | |
2121 | } | |
69310a67 | 2122 | if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */ |
5c33349b | 2123 | { |
2124 | zlog_warn("ospf_recv_packet: discarding runt packet of length %d " | |
2125 | "(ip header size is %u)", | |
2126 | ret, (u_int)sizeof(iph)); | |
718e3744 | 2127 | return NULL; |
2128 | } | |
18b12c38 | 2129 | |
5c33349b | 2130 | /* Note that there should not be alignment problems with this assignment |
2131 | because this is at the beginning of the stream data buffer. */ | |
2132 | iph = (struct ip *) STREAM_DATA(ibuf); | |
2133 | sockopt_iphdrincl_swab_systoh (iph); | |
18b12c38 | 2134 | |
5c33349b | 2135 | ip_len = iph->ip_len; |
6b333611 | 2136 | |
de5ccb96 | 2137 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000) |
718e3744 | 2138 | /* |
2139 | * Kernel network code touches incoming IP header parameters, | |
2140 | * before protocol specific processing. | |
2141 | * | |
2142 | * 1) Convert byteorder to host representation. | |
2143 | * --> ip_len, ip_id, ip_off | |
2144 | * | |
2145 | * 2) Adjust ip_len to strip IP header size! | |
2146 | * --> If user process receives entire IP packet via RAW | |
2147 | * socket, it must consider adding IP header size to | |
2148 | * the "ip_len" field of "ip" structure. | |
2149 | * | |
2150 | * For more details, see <netinet/ip_input.c>. | |
2151 | */ | |
5c33349b | 2152 | ip_len = ip_len + (iph->ip_hl << 2); |
718e3744 | 2153 | #endif |
2154 | ||
0150c9c9 DB |
2155 | #if defined(__DragonFly__) |
2156 | /* | |
2157 | * in DragonFly's raw socket, ip_len/ip_off are read | |
2158 | * in network byte order. | |
2159 | * As OpenBSD < 200311 adjust ip_len to strip IP header size! | |
2160 | */ | |
2161 | ip_len = ntohs(iph->ip_len) + (iph->ip_hl << 2); | |
2162 | #endif | |
2163 | ||
863082d5 | 2164 | ifindex = getsockopt_ifindex (AF_INET, &msgh); |
718e3744 | 2165 | |
2166 | *ifp = if_lookup_by_index (ifindex); | |
2167 | ||
2168 | if (ret != ip_len) | |
2169 | { | |
5c33349b | 2170 | zlog_warn ("ospf_recv_packet read length mismatch: ip_len is %d, " |
2171 | "but recvmsg returned %d", ip_len, ret); | |
718e3744 | 2172 | return NULL; |
2173 | } | |
2174 | ||
2175 | return ibuf; | |
2176 | } | |
2177 | ||
4dadc291 | 2178 | static struct ospf_interface * |
d3f0d621 | 2179 | ospf_associate_packet_vl (struct ospf *ospf, struct interface *ifp, |
718e3744 | 2180 | struct ip *iph, struct ospf_header *ospfh) |
2181 | { | |
2182 | struct ospf_interface *rcv_oi; | |
718e3744 | 2183 | struct ospf_vl_data *vl_data; |
2184 | struct ospf_area *vl_area; | |
52dc7ee6 | 2185 | struct listnode *node; |
718e3744 | 2186 | |
2187 | if (IN_MULTICAST (ntohl (iph->ip_dst.s_addr)) || | |
2188 | !OSPF_IS_AREA_BACKBONE (ospfh)) | |
d3f0d621 | 2189 | return NULL; |
718e3744 | 2190 | |
d3f0d621 | 2191 | /* look for local OSPF interface matching the destination |
2192 | * to determine Area ID. We presume therefore the destination address | |
2193 | * is unique, or at least (for "unnumbered" links), not used in other | |
2194 | * areas | |
2195 | */ | |
2196 | if ((rcv_oi = ospf_if_lookup_by_local_addr (ospf, NULL, | |
2197 | iph->ip_dst)) == NULL) | |
2198 | return NULL; | |
718e3744 | 2199 | |
1eb8ef25 | 2200 | for (ALL_LIST_ELEMENTS_RO (ospf->vlinks, node, vl_data)) |
718e3744 | 2201 | { |
020709f9 | 2202 | vl_area = ospf_area_lookup_by_area_id (ospf, vl_data->vl_area_id); |
718e3744 | 2203 | if (!vl_area) |
2204 | continue; | |
2205 | ||
2206 | if (OSPF_AREA_SAME (&vl_area, &rcv_oi->area) && | |
2207 | IPV4_ADDR_SAME (&vl_data->vl_peer, &ospfh->router_id)) | |
2208 | { | |
2209 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2210 | zlog_debug ("associating packet with %s", |
718e3744 | 2211 | IF_NAME (vl_data->vl_oi)); |
2212 | if (! CHECK_FLAG (vl_data->vl_oi->ifp->flags, IFF_UP)) | |
2213 | { | |
2214 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2215 | zlog_debug ("This VL is not up yet, sorry"); |
718e3744 | 2216 | return NULL; |
2217 | } | |
2218 | ||
2219 | return vl_data->vl_oi; | |
2220 | } | |
2221 | } | |
2222 | ||
2223 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2224 | zlog_debug ("couldn't find any VL to associate the packet with"); |
718e3744 | 2225 | |
d3f0d621 | 2226 | return NULL; |
718e3744 | 2227 | } |
2228 | ||
f63f06da | 2229 | static int |
718e3744 | 2230 | ospf_check_area_id (struct ospf_interface *oi, struct ospf_header *ospfh) |
2231 | { | |
2232 | /* Check match the Area ID of the receiving interface. */ | |
2233 | if (OSPF_AREA_SAME (&oi->area, &ospfh)) | |
2234 | return 1; | |
2235 | ||
2236 | return 0; | |
2237 | } | |
2238 | ||
2239 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2240 | To prevent it, compare src IP address and i/f address with masking | |
2241 | i/f network mask. */ | |
4dadc291 | 2242 | static int |
718e3744 | 2243 | ospf_check_network_mask (struct ospf_interface *oi, struct in_addr ip_src) |
2244 | { | |
2245 | struct in_addr mask, me, him; | |
2246 | ||
2247 | if (oi->type == OSPF_IFTYPE_POINTOPOINT || | |
2248 | oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2249 | return 1; | |
2250 | ||
2251 | masklen2ip (oi->address->prefixlen, &mask); | |
2252 | ||
2253 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
2254 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
2255 | ||
2256 | if (IPV4_ADDR_SAME (&me, &him)) | |
2257 | return 1; | |
2258 | ||
2259 | return 0; | |
2260 | } | |
2261 | ||
4dadc291 | 2262 | static int |
e5259148 | 2263 | ospf_check_auth (struct ospf_interface *oi, struct ospf_header *ospfh) |
718e3744 | 2264 | { |
2265 | int ret = 0; | |
2266 | struct crypt_key *ck; | |
2267 | ||
2268 | switch (ntohs (ospfh->auth_type)) | |
2269 | { | |
2270 | case OSPF_AUTH_NULL: | |
2271 | ret = 1; | |
2272 | break; | |
2273 | case OSPF_AUTH_SIMPLE: | |
2274 | if (!memcmp (OSPF_IF_PARAM (oi, auth_simple), ospfh->u.auth_data, OSPF_AUTH_SIMPLE_SIZE)) | |
2275 | ret = 1; | |
2276 | else | |
2277 | ret = 0; | |
2278 | break; | |
2279 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
1eb8ef25 | 2280 | if ((ck = listgetdata (listtail(OSPF_IF_PARAM (oi,auth_crypt)))) == NULL) |
718e3744 | 2281 | { |
2282 | ret = 0; | |
2283 | break; | |
2284 | } | |
2285 | ||
2286 | /* This is very basic, the digest processing is elsewhere */ | |
2287 | if (ospfh->u.crypt.auth_data_len == OSPF_AUTH_MD5_SIZE && | |
2288 | ospfh->u.crypt.key_id == ck->key_id && | |
e5259148 | 2289 | ntohs (ospfh->length) + OSPF_AUTH_MD5_SIZE <= OSPF_MAX_PACKET_SIZE) |
718e3744 | 2290 | ret = 1; |
2291 | else | |
2292 | ret = 0; | |
2293 | break; | |
2294 | default: | |
2295 | ret = 0; | |
2296 | break; | |
2297 | } | |
2298 | ||
2299 | return ret; | |
2300 | } | |
2301 | ||
4dadc291 | 2302 | static int |
718e3744 | 2303 | ospf_check_sum (struct ospf_header *ospfh) |
2304 | { | |
2305 | u_int32_t ret; | |
2306 | u_int16_t sum; | |
718e3744 | 2307 | |
2308 | /* clear auth_data for checksum. */ | |
2309 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2310 | ||
2311 | /* keep checksum and clear. */ | |
2312 | sum = ospfh->checksum; | |
2313 | memset (&ospfh->checksum, 0, sizeof (u_int16_t)); | |
2314 | ||
2315 | /* calculate checksum. */ | |
2316 | ret = in_cksum (ospfh, ntohs (ospfh->length)); | |
2317 | ||
2318 | if (ret != sum) | |
2319 | { | |
2320 | zlog_info ("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2321 | ret, sum); | |
2322 | return 0; | |
2323 | } | |
2324 | ||
2325 | return 1; | |
2326 | } | |
2327 | ||
75c8eabb DO |
2328 | /* Verify a complete OSPF packet for proper sizing/alignment. */ |
2329 | static unsigned | |
2330 | ospf_packet_examin (struct ospf_header * oh, const unsigned bytesonwire) | |
2331 | { | |
2332 | u_int16_t bytesdeclared; | |
2333 | ||
2334 | /* Length, 1st approximation. */ | |
2335 | if (bytesonwire < OSPF_HEADER_SIZE) | |
2336 | { | |
2337 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2338 | zlog_debug ("%s: undersized (%u B) packet", __func__, bytesonwire); | |
2339 | return MSG_NG; | |
2340 | } | |
2341 | /* Now it is safe to access header fields. Performing length check, allow | |
2342 | * for possible extra bytes of crypto auth/padding, which are not counted | |
2343 | * in the OSPF header "length" field. */ | |
2344 | bytesdeclared = ntohs (oh->length); | |
2345 | if (bytesdeclared > bytesonwire) | |
2346 | { | |
2347 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2348 | zlog_debug ("%s: packet length error (%u real, %u declared)", | |
2349 | __func__, bytesonwire, bytesdeclared); | |
2350 | return MSG_NG; | |
2351 | } | |
2352 | /* Length, 2nd approximation. The type-specific constraint is checked | |
2353 | against declared length, not amount of bytes on wire. */ | |
2354 | if | |
2355 | ( | |
2356 | oh->type >= OSPF_MSG_HELLO && | |
2357 | oh->type <= OSPF_MSG_LS_ACK && | |
2358 | bytesdeclared < OSPF_HEADER_SIZE + ospf_packet_minlen[oh->type] | |
2359 | ) | |
2360 | { | |
2361 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2362 | zlog_debug ("%s: undersized (%u B) %s packet", __func__, | |
2363 | bytesdeclared, LOOKUP (ospf_packet_type_str, oh->type)); | |
2364 | return MSG_NG; | |
2365 | } | |
2366 | return MSG_OK; | |
2367 | } | |
2368 | ||
718e3744 | 2369 | /* OSPF Header verification. */ |
4dadc291 | 2370 | static int |
718e3744 | 2371 | ospf_verify_header (struct stream *ibuf, struct ospf_interface *oi, |
2372 | struct ip *iph, struct ospf_header *ospfh) | |
2373 | { | |
2374 | /* check version. */ | |
2375 | if (ospfh->version != OSPF_VERSION) | |
2376 | { | |
2377 | zlog_warn ("interface %s: ospf_read version number mismatch.", | |
2378 | IF_NAME (oi)); | |
2379 | return -1; | |
2380 | } | |
2381 | ||
71775043 DO |
2382 | /* Valid OSPFv2 packet types are 1 through 5 inclusive. */ |
2383 | if (ospfh->type < 1 || ospfh->type > 5) | |
2384 | { | |
2385 | zlog_warn ("interface %s: invalid packet type %u", IF_NAME (oi), ospfh->type); | |
2386 | return -1; | |
2387 | } | |
2388 | ||
718e3744 | 2389 | /* Check Area ID. */ |
2390 | if (!ospf_check_area_id (oi, ospfh)) | |
2391 | { | |
2392 | zlog_warn ("interface %s: ospf_read invalid Area ID %s.", | |
2393 | IF_NAME (oi), inet_ntoa (ospfh->area_id)); | |
2394 | return -1; | |
2395 | } | |
2396 | ||
2397 | /* Check network mask, Silently discarded. */ | |
2398 | if (! ospf_check_network_mask (oi, iph->ip_src)) | |
2399 | { | |
2400 | zlog_warn ("interface %s: ospf_read network address is not same [%s]", | |
2401 | IF_NAME (oi), inet_ntoa (iph->ip_src)); | |
2402 | return -1; | |
2403 | } | |
2404 | ||
2405 | /* Check authentication. */ | |
2406 | if (ospf_auth_type (oi) != ntohs (ospfh->auth_type)) | |
2407 | { | |
c6371718 | 2408 | zlog_warn ("interface %s: auth-type mismatch, local %d, rcvd %d", |
2409 | IF_NAME (oi), ospf_auth_type (oi), ntohs (ospfh->auth_type)); | |
718e3744 | 2410 | return -1; |
2411 | } | |
2412 | ||
e5259148 | 2413 | if (! ospf_check_auth (oi, ospfh)) |
718e3744 | 2414 | { |
2415 | zlog_warn ("interface %s: ospf_read authentication failed.", | |
2416 | IF_NAME (oi)); | |
2417 | return -1; | |
2418 | } | |
2419 | ||
2420 | /* if check sum is invalid, packet is discarded. */ | |
2421 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2422 | { | |
2423 | if (! ospf_check_sum (ospfh)) | |
2424 | { | |
2425 | zlog_warn ("interface %s: ospf_read packet checksum error %s", | |
2426 | IF_NAME (oi), inet_ntoa (ospfh->router_id)); | |
2427 | return -1; | |
2428 | } | |
2429 | } | |
2430 | else | |
2431 | { | |
2432 | if (ospfh->checksum != 0) | |
2433 | return -1; | |
2434 | if (ospf_check_md5_digest (oi, ibuf, ntohs (ospfh->length)) == 0) | |
2435 | { | |
2436 | zlog_warn ("interface %s: ospf_read md5 authentication failed.", | |
2437 | IF_NAME (oi)); | |
2438 | return -1; | |
2439 | } | |
2440 | } | |
2441 | ||
2442 | return 0; | |
2443 | } | |
2444 | ||
2445 | /* Starting point of packet process function. */ | |
2446 | int | |
2447 | ospf_read (struct thread *thread) | |
2448 | { | |
2449 | int ret; | |
2450 | struct stream *ibuf; | |
68980084 | 2451 | struct ospf *ospf; |
718e3744 | 2452 | struct ospf_interface *oi; |
2453 | struct ip *iph; | |
2454 | struct ospf_header *ospfh; | |
2455 | u_int16_t length; | |
2456 | struct interface *ifp; | |
2457 | ||
2458 | /* first of all get interface pointer. */ | |
68980084 | 2459 | ospf = THREAD_ARG (thread); |
038163fa | 2460 | |
2461 | /* prepare for next packet. */ | |
2462 | ospf->t_read = thread_add_read (master, ospf_read, ospf, ospf->fd); | |
718e3744 | 2463 | |
5c33349b | 2464 | stream_reset(ospf->ibuf); |
2465 | if (!(ibuf = ospf_recv_packet (ospf->fd, &ifp, ospf->ibuf))) | |
718e3744 | 2466 | return -1; |
75c8eabb | 2467 | /* This raw packet is known to be at least as big as its IP header. */ |
718e3744 | 2468 | |
5c33349b | 2469 | /* Note that there should not be alignment problems with this assignment |
2470 | because this is at the beginning of the stream data buffer. */ | |
06f953f7 | 2471 | iph = (struct ip *) STREAM_DATA (ibuf); |
5c33349b | 2472 | /* Note that sockopt_iphdrincl_swab_systoh was called in ospf_recv_packet. */ |
06f953f7 | 2473 | |
ac191232 | 2474 | if (ifp == NULL) |
b87f772a | 2475 | /* Handle cases where the platform does not support retrieving the ifindex, |
2476 | and also platforms (such as Solaris 8) that claim to support ifindex | |
2477 | retrieval but do not. */ | |
ac191232 | 2478 | ifp = if_lookup_address (iph->ip_src); |
ac191232 | 2479 | |
d3f0d621 | 2480 | if (ifp == NULL) |
5c33349b | 2481 | return 0; |
718e3744 | 2482 | |
2483 | /* IP Header dump. */ | |
17b78d38 | 2484 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) |
6b333611 | 2485 | ospf_ip_header_dump (iph); |
7d95c611 | 2486 | |
718e3744 | 2487 | /* Self-originated packet should be discarded silently. */ |
68980084 | 2488 | if (ospf_if_lookup_by_local_addr (ospf, NULL, iph->ip_src)) |
718e3744 | 2489 | { |
d324181c | 2490 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) |
2491 | { | |
2a42e285 | 2492 | zlog_debug ("ospf_read[%s]: Dropping self-originated packet", |
d324181c | 2493 | inet_ntoa (iph->ip_src)); |
2494 | } | |
718e3744 | 2495 | return 0; |
2496 | } | |
2497 | ||
61ab0301 DO |
2498 | /* Advance from IP header to OSPF header (iph->ip_hl has been verified |
2499 | by ospf_recv_packet() to be correct). */ | |
9985f83c | 2500 | stream_forward_getp (ibuf, iph->ip_hl * 4); |
61ab0301 | 2501 | |
75c8eabb DO |
2502 | ospfh = (struct ospf_header *) STREAM_PNT (ibuf); |
2503 | if (MSG_OK != ospf_packet_examin (ospfh, stream_get_endp (ibuf) - stream_get_getp (ibuf))) | |
61ab0301 | 2504 | return -1; |
61ab0301 | 2505 | /* Now it is safe to access all fields of OSPF packet header. */ |
718e3744 | 2506 | |
2507 | /* associate packet with ospf interface */ | |
05cf46ba | 2508 | oi = ospf_if_lookup_recv_if (ospf, iph->ip_src, ifp); |
d3f0d621 | 2509 | |
3aad46bd YS |
2510 | /* ospf_verify_header() relies on a valid "oi" and thus can be called only |
2511 | after the passive/backbone/other checks below are passed. These checks | |
2512 | in turn access the fields of unverified "ospfh" structure for their own | |
2513 | purposes and must remain very accurate in doing this. */ | |
71775043 | 2514 | |
491eddc2 JT |
2515 | /* If incoming interface is passive one, ignore it. */ |
2516 | if (oi && OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) | |
2517 | { | |
2518 | char buf[3][INET_ADDRSTRLEN]; | |
2519 | ||
2520 | if (IS_DEBUG_OSPF_EVENT) | |
2521 | zlog_debug ("ignoring packet from router %s sent to %s, " | |
2522 | "received on a passive interface, %s", | |
2523 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], sizeof(buf[0])), | |
2524 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2525 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
2526 | buf[2], sizeof(buf[2]))); | |
2527 | ||
2528 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
2529 | { | |
2530 | /* Try to fix multicast membership. | |
2531 | * Some OS:es may have problems in this area, | |
2532 | * make sure it is removed. | |
2533 | */ | |
2534 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
2535 | ospf_if_set_multicast(oi); | |
2536 | } | |
2537 | return 0; | |
2538 | } | |
2539 | ||
2540 | ||
d3f0d621 | 2541 | /* if no local ospf_interface, |
2542 | * or header area is backbone but ospf_interface is not | |
2543 | * check for VLINK interface | |
2544 | */ | |
2545 | if ( (oi == NULL) || | |
2546 | (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) | |
2547 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id)) | |
2548 | ) | |
718e3744 | 2549 | { |
d3f0d621 | 2550 | if ((oi = ospf_associate_packet_vl (ospf, ifp, iph, ospfh)) == NULL) |
d324181c | 2551 | { |
88871b1d PJ |
2552 | if (IS_DEBUG_OSPF_EVENT) |
2553 | zlog_debug ("Packet from [%s] received on link %s" | |
2554 | " but no ospf_interface", | |
2555 | inet_ntoa (iph->ip_src), ifp->name); | |
d3f0d621 | 2556 | return 0; |
d324181c | 2557 | } |
d3f0d621 | 2558 | } |
05cf46ba | 2559 | |
d3f0d621 | 2560 | /* else it must be a local ospf interface, check it was received on |
2561 | * correct link | |
2562 | */ | |
2563 | else if (oi->ifp != ifp) | |
2564 | { | |
11637435 PJ |
2565 | if (IS_DEBUG_OSPF_EVENT) |
2566 | zlog_warn ("Packet from [%s] received on wrong link %s", | |
2567 | inet_ntoa (iph->ip_src), ifp->name); | |
718e3744 | 2568 | return 0; |
2569 | } | |
847947f2 | 2570 | else if (oi->state == ISM_Down) |
c3eab871 | 2571 | { |
ba6454ec | 2572 | char buf[2][INET_ADDRSTRLEN]; |
2573 | zlog_warn ("Ignoring packet from %s to %s received on interface that is " | |
847947f2 | 2574 | "down [%s]; interface flags are %s", |
ba6454ec | 2575 | inet_ntop(AF_INET, &iph->ip_src, buf[0], sizeof(buf[0])), |
2576 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2577 | ifp->name, if_flag_dump(ifp->flags)); | |
ba6454ec | 2578 | /* Fix multicast memberships? */ |
2579 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
429ac78c | 2580 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); |
ba6454ec | 2581 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) |
429ac78c | 2582 | OI_MEMBER_JOINED(oi, MEMBER_DROUTERS); |
ba6454ec | 2583 | if (oi->multicast_memberships) |
2584 | ospf_if_set_multicast(oi); | |
c3eab871 | 2585 | return 0; |
2586 | } | |
718e3744 | 2587 | |
2588 | /* | |
2589 | * If the received packet is destined for AllDRouters, the packet | |
2590 | * should be accepted only if the received ospf interface state is | |
2591 | * either DR or Backup -- endo. | |
2592 | */ | |
2593 | if (iph->ip_dst.s_addr == htonl (OSPF_ALLDROUTERS) | |
2594 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) | |
2595 | { | |
ba6454ec | 2596 | zlog_warn ("Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", |
718e3744 | 2597 | inet_ntoa (iph->ip_src), IF_NAME (oi), |
2598 | LOOKUP (ospf_ism_state_msg, oi->state)); | |
ba6454ec | 2599 | /* Try to fix multicast membership. */ |
2600 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
2601 | ospf_if_set_multicast(oi); | |
718e3744 | 2602 | return 0; |
2603 | } | |
2604 | ||
3aad46bd YS |
2605 | /* Verify more OSPF header fields. */ |
2606 | ret = ospf_verify_header (ibuf, oi, iph, ospfh); | |
2607 | if (ret < 0) | |
2608 | { | |
2609 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2610 | zlog_debug ("ospf_read[%s]: Header check failed, " | |
2611 | "dropping.", | |
2612 | inet_ntoa (iph->ip_src)); | |
2613 | return ret; | |
2614 | } | |
2615 | ||
718e3744 | 2616 | /* Show debug receiving packet. */ |
1aa7b399 | 2617 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2618 | { | |
718e3744 | 2619 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) |
1aa7b399 | 2620 | { |
2a42e285 | 2621 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2622 | ospf_packet_dump (ibuf); |
2623 | } | |
718e3744 | 2624 | |
2a42e285 | 2625 | zlog_debug ("%s received from [%s] via [%s]", |
272ca1e3 | 2626 | LOOKUP (ospf_packet_type_str, ospfh->type), |
1aa7b399 | 2627 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); |
2a42e285 | 2628 | zlog_debug (" src [%s],", inet_ntoa (iph->ip_src)); |
2629 | zlog_debug (" dst [%s]", inet_ntoa (iph->ip_dst)); | |
718e3744 | 2630 | |
2631 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) | |
2a42e285 | 2632 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2633 | } |
718e3744 | 2634 | |
9985f83c | 2635 | stream_forward_getp (ibuf, OSPF_HEADER_SIZE); |
718e3744 | 2636 | |
2637 | /* Adjust size to message length. */ | |
2638 | length = ntohs (ospfh->length) - OSPF_HEADER_SIZE; | |
2639 | ||
2640 | /* Read rest of the packet and call each sort of packet routine. */ | |
2641 | switch (ospfh->type) | |
2642 | { | |
2643 | case OSPF_MSG_HELLO: | |
2644 | ospf_hello (iph, ospfh, ibuf, oi, length); | |
2645 | break; | |
2646 | case OSPF_MSG_DB_DESC: | |
2647 | ospf_db_desc (iph, ospfh, ibuf, oi, length); | |
2648 | break; | |
2649 | case OSPF_MSG_LS_REQ: | |
2650 | ospf_ls_req (iph, ospfh, ibuf, oi, length); | |
2651 | break; | |
2652 | case OSPF_MSG_LS_UPD: | |
2653 | ospf_ls_upd (iph, ospfh, ibuf, oi, length); | |
2654 | break; | |
2655 | case OSPF_MSG_LS_ACK: | |
2656 | ospf_ls_ack (iph, ospfh, ibuf, oi, length); | |
2657 | break; | |
2658 | default: | |
2659 | zlog (NULL, LOG_WARNING, | |
2660 | "interface %s: OSPF packet header type %d is illegal", | |
2661 | IF_NAME (oi), ospfh->type); | |
2662 | break; | |
2663 | } | |
2664 | ||
718e3744 | 2665 | return 0; |
2666 | } | |
2667 | ||
2668 | /* Make OSPF header. */ | |
4dadc291 | 2669 | static void |
718e3744 | 2670 | ospf_make_header (int type, struct ospf_interface *oi, struct stream *s) |
2671 | { | |
2672 | struct ospf_header *ospfh; | |
2673 | ||
2674 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
2675 | ||
2676 | ospfh->version = (u_char) OSPF_VERSION; | |
2677 | ospfh->type = (u_char) type; | |
2678 | ||
68980084 | 2679 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 2680 | |
2681 | ospfh->checksum = 0; | |
2682 | ospfh->area_id = oi->area->area_id; | |
2683 | ospfh->auth_type = htons (ospf_auth_type (oi)); | |
2684 | ||
2685 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2686 | ||
9985f83c | 2687 | stream_forward_endp (s, OSPF_HEADER_SIZE); |
718e3744 | 2688 | } |
2689 | ||
2690 | /* Make Authentication Data. */ | |
4dadc291 | 2691 | static int |
718e3744 | 2692 | ospf_make_auth (struct ospf_interface *oi, struct ospf_header *ospfh) |
2693 | { | |
2694 | struct crypt_key *ck; | |
2695 | ||
2696 | switch (ospf_auth_type (oi)) | |
2697 | { | |
2698 | case OSPF_AUTH_NULL: | |
2699 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
2700 | break; | |
2701 | case OSPF_AUTH_SIMPLE: | |
2702 | memcpy (ospfh->u.auth_data, OSPF_IF_PARAM (oi, auth_simple), | |
2703 | OSPF_AUTH_SIMPLE_SIZE); | |
2704 | break; | |
2705 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
2706 | /* If key is not set, then set 0. */ | |
2707 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
2708 | { | |
2709 | ospfh->u.crypt.zero = 0; | |
2710 | ospfh->u.crypt.key_id = 0; | |
2711 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
2712 | } | |
2713 | else | |
2714 | { | |
1eb8ef25 | 2715 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
718e3744 | 2716 | ospfh->u.crypt.zero = 0; |
2717 | ospfh->u.crypt.key_id = ck->key_id; | |
2718 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
2719 | } | |
2720 | /* note: the seq is done in ospf_make_md5_digest() */ | |
2721 | break; | |
2722 | default: | |
2723 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
2724 | break; | |
2725 | } | |
2726 | ||
2727 | return 0; | |
2728 | } | |
2729 | ||
2730 | /* Fill rest of OSPF header. */ | |
4dadc291 | 2731 | static void |
718e3744 | 2732 | ospf_fill_header (struct ospf_interface *oi, |
2733 | struct stream *s, u_int16_t length) | |
2734 | { | |
2735 | struct ospf_header *ospfh; | |
2736 | ||
2737 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
2738 | ||
2739 | /* Fill length. */ | |
2740 | ospfh->length = htons (length); | |
2741 | ||
2742 | /* Calculate checksum. */ | |
2743 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2744 | ospfh->checksum = in_cksum (ospfh, length); | |
2745 | else | |
2746 | ospfh->checksum = 0; | |
2747 | ||
2748 | /* Add Authentication Data. */ | |
2749 | ospf_make_auth (oi, ospfh); | |
2750 | } | |
2751 | ||
4dadc291 | 2752 | static int |
718e3744 | 2753 | ospf_make_hello (struct ospf_interface *oi, struct stream *s) |
2754 | { | |
2755 | struct ospf_neighbor *nbr; | |
2756 | struct route_node *rn; | |
2757 | u_int16_t length = OSPF_HELLO_MIN_SIZE; | |
2758 | struct in_addr mask; | |
2759 | unsigned long p; | |
2760 | int flag = 0; | |
2761 | ||
2762 | /* Set netmask of interface. */ | |
2763 | if (oi->type != OSPF_IFTYPE_POINTOPOINT && | |
2764 | oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
2765 | masklen2ip (oi->address->prefixlen, &mask); | |
2766 | else | |
2767 | memset ((char *) &mask, 0, sizeof (struct in_addr)); | |
2768 | stream_put_ipv4 (s, mask.s_addr); | |
2769 | ||
2770 | /* Set Hello Interval. */ | |
f9ad937f | 2771 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) |
2772 | stream_putw (s, OSPF_IF_PARAM (oi, v_hello)); | |
2773 | else | |
2774 | stream_putw (s, 0); /* hello-interval of 0 for fast-hellos */ | |
718e3744 | 2775 | |
2776 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2777 | zlog_debug ("make_hello: options: %x, int: %s", |
718e3744 | 2778 | OPTIONS(oi), IF_NAME (oi)); |
2779 | ||
2780 | /* Set Options. */ | |
2781 | stream_putc (s, OPTIONS (oi)); | |
2782 | ||
2783 | /* Set Router Priority. */ | |
2784 | stream_putc (s, PRIORITY (oi)); | |
2785 | ||
2786 | /* Set Router Dead Interval. */ | |
2787 | stream_putl (s, OSPF_IF_PARAM (oi, v_wait)); | |
2788 | ||
2789 | /* Set Designated Router. */ | |
2790 | stream_put_ipv4 (s, DR (oi).s_addr); | |
2791 | ||
9985f83c | 2792 | p = stream_get_endp (s); |
718e3744 | 2793 | |
2794 | /* Set Backup Designated Router. */ | |
2795 | stream_put_ipv4 (s, BDR (oi).s_addr); | |
2796 | ||
2797 | /* Add neighbor seen. */ | |
2798 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
68980084 | 2799 | if ((nbr = rn->info)) |
2800 | if (nbr->router_id.s_addr != 0) /* Ignore 0.0.0.0 node. */ | |
2801 | if (nbr->state != NSM_Attempt) /* Ignore Down neighbor. */ | |
2802 | if (nbr->state != NSM_Down) /* This is myself for DR election. */ | |
2803 | if (!IPV4_ADDR_SAME (&nbr->router_id, &oi->ospf->router_id)) | |
718e3744 | 2804 | { |
2805 | /* Check neighbor is sane? */ | |
68980084 | 2806 | if (nbr->d_router.s_addr != 0 |
2807 | && IPV4_ADDR_SAME (&nbr->d_router, &oi->address->u.prefix4) | |
2808 | && IPV4_ADDR_SAME (&nbr->bd_router, &oi->address->u.prefix4)) | |
2809 | flag = 1; | |
718e3744 | 2810 | |
2811 | stream_put_ipv4 (s, nbr->router_id.s_addr); | |
2812 | length += 4; | |
2813 | } | |
2814 | ||
2815 | /* Let neighbor generate BackupSeen. */ | |
2816 | if (flag == 1) | |
3a9eb091 | 2817 | stream_putl_at (s, p, 0); /* ipv4 address, normally */ |
718e3744 | 2818 | |
2819 | return length; | |
2820 | } | |
2821 | ||
4dadc291 | 2822 | static int |
718e3744 | 2823 | ospf_make_db_desc (struct ospf_interface *oi, struct ospf_neighbor *nbr, |
2824 | struct stream *s) | |
2825 | { | |
2826 | struct ospf_lsa *lsa; | |
2827 | u_int16_t length = OSPF_DB_DESC_MIN_SIZE; | |
2828 | u_char options; | |
2829 | unsigned long pp; | |
2830 | int i; | |
2831 | struct ospf_lsdb *lsdb; | |
2832 | ||
2833 | /* Set Interface MTU. */ | |
2834 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2835 | stream_putw (s, 0); | |
2836 | else | |
2837 | stream_putw (s, oi->ifp->mtu); | |
2838 | ||
2839 | /* Set Options. */ | |
2840 | options = OPTIONS (oi); | |
2841 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 2842 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 2843 | { |
2844 | if (IS_SET_DD_I (nbr->dd_flags) | |
2845 | || CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
2846 | /* | |
2847 | * Set O-bit in the outgoing DD packet for capablity negotiation, | |
2848 | * if one of following case is applicable. | |
2849 | * | |
2850 | * 1) WaitTimer expiration event triggered the neighbor state to | |
2851 | * change to Exstart, but no (valid) DD packet has received | |
2852 | * from the neighbor yet. | |
2853 | * | |
2854 | * 2) At least one DD packet with O-bit on has received from the | |
2855 | * neighbor. | |
2856 | */ | |
2857 | SET_FLAG (options, OSPF_OPTION_O); | |
2858 | } | |
2859 | #endif /* HAVE_OPAQUE_LSA */ | |
2860 | stream_putc (s, options); | |
2861 | ||
8dd24ee6 | 2862 | /* DD flags */ |
9985f83c | 2863 | pp = stream_get_endp (s); |
718e3744 | 2864 | stream_putc (s, nbr->dd_flags); |
2865 | ||
2866 | /* Set DD Sequence Number. */ | |
2867 | stream_putl (s, nbr->dd_seqnum); | |
2868 | ||
b5aeb441 | 2869 | /* shortcut unneeded walk of (empty) summary LSDBs */ |
718e3744 | 2870 | if (ospf_db_summary_isempty (nbr)) |
b5aeb441 | 2871 | goto empty; |
718e3744 | 2872 | |
2873 | /* Describe LSA Header from Database Summary List. */ | |
2874 | lsdb = &nbr->db_sum; | |
2875 | ||
2876 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
2877 | { | |
2878 | struct route_table *table = lsdb->type[i].db; | |
2879 | struct route_node *rn; | |
2880 | ||
2881 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
2882 | if ((lsa = rn->info) != NULL) | |
2883 | { | |
2884 | #ifdef HAVE_OPAQUE_LSA | |
2885 | if (IS_OPAQUE_LSA (lsa->data->type) | |
2886 | && (! CHECK_FLAG (options, OSPF_OPTION_O))) | |
2887 | { | |
2888 | /* Suppress advertising opaque-informations. */ | |
2889 | /* Remove LSA from DB summary list. */ | |
2890 | ospf_lsdb_delete (lsdb, lsa); | |
2891 | continue; | |
2892 | } | |
2893 | #endif /* HAVE_OPAQUE_LSA */ | |
2894 | ||
2895 | if (!CHECK_FLAG (lsa->flags, OSPF_LSA_DISCARD)) | |
2896 | { | |
2897 | struct lsa_header *lsah; | |
2898 | u_int16_t ls_age; | |
2899 | ||
2900 | /* DD packet overflows interface MTU. */ | |
86f1fd96 | 2901 | if (length + OSPF_LSA_HEADER_SIZE > ospf_packet_max (oi)) |
718e3744 | 2902 | break; |
2903 | ||
2904 | /* Keep pointer to LS age. */ | |
2905 | lsah = (struct lsa_header *) (STREAM_DATA (s) + | |
9985f83c | 2906 | stream_get_endp (s)); |
718e3744 | 2907 | |
2908 | /* Proceed stream pointer. */ | |
2909 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
2910 | length += OSPF_LSA_HEADER_SIZE; | |
2911 | ||
2912 | /* Set LS age. */ | |
2913 | ls_age = LS_AGE (lsa); | |
2914 | lsah->ls_age = htons (ls_age); | |
2915 | ||
2916 | } | |
2917 | ||
2918 | /* Remove LSA from DB summary list. */ | |
2919 | ospf_lsdb_delete (lsdb, lsa); | |
2920 | } | |
2921 | } | |
2922 | ||
8dd24ee6 PJ |
2923 | /* Update 'More' bit */ |
2924 | if (ospf_db_summary_isempty (nbr)) | |
2925 | { | |
b5aeb441 PJ |
2926 | empty: |
2927 | if (nbr->state >= NSM_Exchange) | |
2928 | { | |
2929 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_M); | |
2930 | /* Rewrite DD flags */ | |
2931 | stream_putc_at (s, pp, nbr->dd_flags); | |
2932 | } | |
2933 | else | |
2934 | { | |
2935 | assert (IS_SET_DD_M(nbr->dd_flags)); | |
2936 | } | |
8dd24ee6 | 2937 | } |
718e3744 | 2938 | return length; |
2939 | } | |
2940 | ||
4dadc291 | 2941 | static int |
718e3744 | 2942 | ospf_make_ls_req_func (struct stream *s, u_int16_t *length, |
2943 | unsigned long delta, struct ospf_neighbor *nbr, | |
2944 | struct ospf_lsa *lsa) | |
2945 | { | |
2946 | struct ospf_interface *oi; | |
2947 | ||
2948 | oi = nbr->oi; | |
2949 | ||
2950 | /* LS Request packet overflows interface MTU. */ | |
86f1fd96 | 2951 | if (*length + delta > ospf_packet_max(oi)) |
718e3744 | 2952 | return 0; |
2953 | ||
2954 | stream_putl (s, lsa->data->type); | |
2955 | stream_put_ipv4 (s, lsa->data->id.s_addr); | |
2956 | stream_put_ipv4 (s, lsa->data->adv_router.s_addr); | |
2957 | ||
1fe6ed38 | 2958 | ospf_lsa_unlock (&nbr->ls_req_last); |
718e3744 | 2959 | nbr->ls_req_last = ospf_lsa_lock (lsa); |
2960 | ||
2961 | *length += 12; | |
2962 | return 1; | |
2963 | } | |
2964 | ||
4dadc291 | 2965 | static int |
718e3744 | 2966 | ospf_make_ls_req (struct ospf_neighbor *nbr, struct stream *s) |
2967 | { | |
2968 | struct ospf_lsa *lsa; | |
2969 | u_int16_t length = OSPF_LS_REQ_MIN_SIZE; | |
9985f83c | 2970 | unsigned long delta = stream_get_endp(s)+12; |
718e3744 | 2971 | struct route_table *table; |
2972 | struct route_node *rn; | |
2973 | int i; | |
2974 | struct ospf_lsdb *lsdb; | |
2975 | ||
2976 | lsdb = &nbr->ls_req; | |
2977 | ||
2978 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
2979 | { | |
2980 | table = lsdb->type[i].db; | |
2981 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
2982 | if ((lsa = (rn->info)) != NULL) | |
2983 | if (ospf_make_ls_req_func (s, &length, delta, nbr, lsa) == 0) | |
2984 | { | |
2985 | route_unlock_node (rn); | |
2986 | break; | |
2987 | } | |
2988 | } | |
2989 | return length; | |
2990 | } | |
2991 | ||
4dadc291 | 2992 | static int |
718e3744 | 2993 | ls_age_increment (struct ospf_lsa *lsa, int delay) |
2994 | { | |
2995 | int age; | |
2996 | ||
2997 | age = IS_LSA_MAXAGE (lsa) ? OSPF_LSA_MAXAGE : LS_AGE (lsa) + delay; | |
2998 | ||
2999 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); | |
3000 | } | |
3001 | ||
4dadc291 | 3002 | static int |
52dc7ee6 | 3003 | ospf_make_ls_upd (struct ospf_interface *oi, struct list *update, struct stream *s) |
718e3744 | 3004 | { |
3005 | struct ospf_lsa *lsa; | |
52dc7ee6 | 3006 | struct listnode *node; |
c9035ccd | 3007 | u_int16_t length = 0; |
86f1fd96 | 3008 | unsigned int size_noauth; |
9985f83c | 3009 | unsigned long delta = stream_get_endp (s); |
718e3744 | 3010 | unsigned long pp; |
3011 | int count = 0; | |
3012 | ||
3013 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3014 | zlog_debug ("ospf_make_ls_upd: Start"); |
59ea14c6 | 3015 | |
9985f83c | 3016 | pp = stream_get_endp (s); |
3017 | stream_forward_endp (s, OSPF_LS_UPD_MIN_SIZE); | |
c9035ccd | 3018 | length += OSPF_LS_UPD_MIN_SIZE; |
718e3744 | 3019 | |
86f1fd96 | 3020 | /* Calculate amount of packet usable for data. */ |
3021 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
3022 | ||
718e3744 | 3023 | while ((node = listhead (update)) != NULL) |
3024 | { | |
3025 | struct lsa_header *lsah; | |
3026 | u_int16_t ls_age; | |
3027 | ||
3028 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3029 | zlog_debug ("ospf_make_ls_upd: List Iteration"); |
718e3744 | 3030 | |
1eb8ef25 | 3031 | lsa = listgetdata (node); |
3032 | ||
718e3744 | 3033 | assert (lsa->data); |
3034 | ||
68b7339a | 3035 | /* Will it fit? */ |
86f1fd96 | 3036 | if (length + delta + ntohs (lsa->data->length) > size_noauth) |
59ea14c6 | 3037 | break; |
3038 | ||
718e3744 | 3039 | /* Keep pointer to LS age. */ |
9985f83c | 3040 | lsah = (struct lsa_header *) (STREAM_DATA (s) + stream_get_endp (s)); |
718e3744 | 3041 | |
3042 | /* Put LSA to Link State Request. */ | |
3043 | stream_put (s, lsa->data, ntohs (lsa->data->length)); | |
3044 | ||
3045 | /* Set LS age. */ | |
3046 | /* each hop must increment an lsa_age by transmit_delay | |
3047 | of OSPF interface */ | |
3048 | ls_age = ls_age_increment (lsa, OSPF_IF_PARAM (oi, transmit_delay)); | |
3049 | lsah->ls_age = htons (ls_age); | |
3050 | ||
3051 | length += ntohs (lsa->data->length); | |
3052 | count++; | |
3053 | ||
3054 | list_delete_node (update, node); | |
1fe6ed38 | 3055 | ospf_lsa_unlock (&lsa); /* oi->ls_upd_queue */ |
718e3744 | 3056 | } |
3057 | ||
3058 | /* Now set #LSAs. */ | |
3a9eb091 | 3059 | stream_putl_at (s, pp, count); |
718e3744 | 3060 | |
3061 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3062 | zlog_debug ("ospf_make_ls_upd: Stop"); |
718e3744 | 3063 | return length; |
3064 | } | |
3065 | ||
4dadc291 | 3066 | static int |
52dc7ee6 | 3067 | ospf_make_ls_ack (struct ospf_interface *oi, struct list *ack, struct stream *s) |
718e3744 | 3068 | { |
1fe6ed38 | 3069 | struct listnode *node, *nnode; |
718e3744 | 3070 | u_int16_t length = OSPF_LS_ACK_MIN_SIZE; |
9985f83c | 3071 | unsigned long delta = stream_get_endp(s) + 24; |
718e3744 | 3072 | struct ospf_lsa *lsa; |
3073 | ||
1fe6ed38 | 3074 | for (ALL_LIST_ELEMENTS (ack, node, nnode, lsa)) |
718e3744 | 3075 | { |
718e3744 | 3076 | assert (lsa); |
3077 | ||
86f1fd96 | 3078 | if (length + delta > ospf_packet_max (oi)) |
718e3744 | 3079 | break; |
3080 | ||
3081 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
3082 | length += OSPF_LSA_HEADER_SIZE; | |
3083 | ||
718e3744 | 3084 | listnode_delete (ack, lsa); |
1fe6ed38 | 3085 | ospf_lsa_unlock (&lsa); /* oi->ls_ack_direct.ls_ack */ |
718e3744 | 3086 | } |
3087 | ||
718e3744 | 3088 | return length; |
3089 | } | |
3090 | ||
aa276fd7 PJ |
3091 | static void |
3092 | ospf_hello_send_sub (struct ospf_interface *oi, in_addr_t addr) | |
718e3744 | 3093 | { |
3094 | struct ospf_packet *op; | |
3095 | u_int16_t length = OSPF_HEADER_SIZE; | |
3096 | ||
3097 | op = ospf_packet_new (oi->ifp->mtu); | |
3098 | ||
3099 | /* Prepare OSPF common header. */ | |
3100 | ospf_make_header (OSPF_MSG_HELLO, oi, op->s); | |
3101 | ||
3102 | /* Prepare OSPF Hello body. */ | |
3103 | length += ospf_make_hello (oi, op->s); | |
3104 | ||
3105 | /* Fill OSPF header. */ | |
3106 | ospf_fill_header (oi, op->s, length); | |
3107 | ||
3108 | /* Set packet length. */ | |
3109 | op->length = length; | |
3110 | ||
aa276fd7 | 3111 | op->dst.s_addr = addr; |
718e3744 | 3112 | |
aa276fd7 PJ |
3113 | /* Add packet to the top of the interface output queue, so that they |
3114 | * can't get delayed by things like long queues of LS Update packets | |
3115 | */ | |
3116 | ospf_packet_add_top (oi, op); | |
718e3744 | 3117 | |
3118 | /* Hook thread to write packet. */ | |
020709f9 | 3119 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3120 | } |
3121 | ||
4dadc291 | 3122 | static void |
718e3744 | 3123 | ospf_poll_send (struct ospf_nbr_nbma *nbr_nbma) |
3124 | { | |
3125 | struct ospf_interface *oi; | |
3126 | ||
3127 | oi = nbr_nbma->oi; | |
3128 | assert(oi); | |
3129 | ||
3130 | /* If this is passive interface, do not send OSPF Hello. */ | |
7ffa8fa2 | 3131 | if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) |
718e3744 | 3132 | return; |
3133 | ||
3134 | if (oi->type != OSPF_IFTYPE_NBMA) | |
3135 | return; | |
3136 | ||
3137 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) | |
3138 | return; | |
3139 | ||
3140 | if (PRIORITY(oi) == 0) | |
3141 | return; | |
3142 | ||
3143 | if (nbr_nbma->priority == 0 | |
3144 | && oi->state != ISM_DR && oi->state != ISM_Backup) | |
3145 | return; | |
3146 | ||
aa276fd7 | 3147 | ospf_hello_send_sub (oi, nbr_nbma->addr.s_addr); |
718e3744 | 3148 | } |
3149 | ||
3150 | int | |
3151 | ospf_poll_timer (struct thread *thread) | |
3152 | { | |
3153 | struct ospf_nbr_nbma *nbr_nbma; | |
3154 | ||
3155 | nbr_nbma = THREAD_ARG (thread); | |
3156 | nbr_nbma->t_poll = NULL; | |
3157 | ||
3158 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3159 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Poll timer expire)", |
718e3744 | 3160 | IF_NAME (nbr_nbma->oi), inet_ntoa (nbr_nbma->addr)); |
3161 | ||
3162 | ospf_poll_send (nbr_nbma); | |
3163 | ||
3164 | if (nbr_nbma->v_poll > 0) | |
3165 | OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, | |
3166 | nbr_nbma->v_poll); | |
3167 | ||
3168 | return 0; | |
3169 | } | |
3170 | ||
3171 | ||
3172 | int | |
3173 | ospf_hello_reply_timer (struct thread *thread) | |
3174 | { | |
3175 | struct ospf_neighbor *nbr; | |
3176 | ||
3177 | nbr = THREAD_ARG (thread); | |
3178 | nbr->t_hello_reply = NULL; | |
3179 | ||
3180 | assert (nbr->oi); | |
3181 | ||
3182 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3183 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (hello-reply timer expire)", |
718e3744 | 3184 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); |
3185 | ||
aa276fd7 | 3186 | ospf_hello_send_sub (nbr->oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3187 | |
3188 | return 0; | |
3189 | } | |
3190 | ||
3191 | /* Send OSPF Hello. */ | |
3192 | void | |
3193 | ospf_hello_send (struct ospf_interface *oi) | |
3194 | { | |
718e3744 | 3195 | /* If this is passive interface, do not send OSPF Hello. */ |
7ffa8fa2 | 3196 | if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) |
718e3744 | 3197 | return; |
3198 | ||
718e3744 | 3199 | if (oi->type == OSPF_IFTYPE_NBMA) |
3200 | { | |
3201 | struct ospf_neighbor *nbr; | |
3202 | struct route_node *rn; | |
3203 | ||
3204 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3205 | if ((nbr = rn->info)) | |
3206 | if (nbr != oi->nbr_self) | |
3207 | if (nbr->state != NSM_Down) | |
3208 | { | |
3209 | /* RFC 2328 Section 9.5.1 | |
3210 | If the router is not eligible to become Designated Router, | |
3211 | it must periodically send Hello Packets to both the | |
3212 | Designated Router and the Backup Designated Router (if they | |
3213 | exist). */ | |
3214 | if (PRIORITY(oi) == 0 && | |
3215 | IPV4_ADDR_CMP(&DR(oi), &nbr->address.u.prefix4) && | |
3216 | IPV4_ADDR_CMP(&BDR(oi), &nbr->address.u.prefix4)) | |
3217 | continue; | |
3218 | ||
3219 | /* If the router is eligible to become Designated Router, it | |
3220 | must periodically send Hello Packets to all neighbors that | |
3221 | are also eligible. In addition, if the router is itself the | |
3222 | Designated Router or Backup Designated Router, it must also | |
3223 | send periodic Hello Packets to all other neighbors. */ | |
3224 | ||
3225 | if (nbr->priority == 0 && oi->state == ISM_DROther) | |
3226 | continue; | |
3227 | /* if oi->state == Waiting, send hello to all neighbors */ | |
aa276fd7 | 3228 | ospf_hello_send_sub (oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3229 | } |
718e3744 | 3230 | } |
3231 | else | |
3232 | { | |
3233 | /* Decide destination address. */ | |
3234 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
aa276fd7 PJ |
3235 | ospf_hello_send_sub (oi, oi->vl_data->peer_addr.s_addr); |
3236 | else | |
3237 | ospf_hello_send_sub (oi, htonl (OSPF_ALLSPFROUTERS)); | |
718e3744 | 3238 | } |
3239 | } | |
3240 | ||
3241 | /* Send OSPF Database Description. */ | |
3242 | void | |
3243 | ospf_db_desc_send (struct ospf_neighbor *nbr) | |
3244 | { | |
3245 | struct ospf_interface *oi; | |
3246 | struct ospf_packet *op; | |
3247 | u_int16_t length = OSPF_HEADER_SIZE; | |
3248 | ||
3249 | oi = nbr->oi; | |
3250 | op = ospf_packet_new (oi->ifp->mtu); | |
3251 | ||
3252 | /* Prepare OSPF common header. */ | |
3253 | ospf_make_header (OSPF_MSG_DB_DESC, oi, op->s); | |
3254 | ||
3255 | /* Prepare OSPF Database Description body. */ | |
3256 | length += ospf_make_db_desc (oi, nbr, op->s); | |
3257 | ||
3258 | /* Fill OSPF header. */ | |
3259 | ospf_fill_header (oi, op->s, length); | |
3260 | ||
3261 | /* Set packet length. */ | |
3262 | op->length = length; | |
3263 | ||
3264 | /* Decide destination address. */ | |
53d0dece JT |
3265 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3266 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3267 | else | |
3268 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3269 | |
3270 | /* Add packet to the interface output queue. */ | |
3271 | ospf_packet_add (oi, op); | |
3272 | ||
3273 | /* Hook thread to write packet. */ | |
020709f9 | 3274 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3275 | |
3276 | /* Remove old DD packet, then copy new one and keep in neighbor structure. */ | |
3277 | if (nbr->last_send) | |
3278 | ospf_packet_free (nbr->last_send); | |
3279 | nbr->last_send = ospf_packet_dup (op); | |
2518efd1 | 3280 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &nbr->last_send_ts); |
718e3744 | 3281 | } |
3282 | ||
3283 | /* Re-send Database Description. */ | |
3284 | void | |
3285 | ospf_db_desc_resend (struct ospf_neighbor *nbr) | |
3286 | { | |
3287 | struct ospf_interface *oi; | |
3288 | ||
3289 | oi = nbr->oi; | |
3290 | ||
3291 | /* Add packet to the interface output queue. */ | |
3292 | ospf_packet_add (oi, ospf_packet_dup (nbr->last_send)); | |
3293 | ||
3294 | /* Hook thread to write packet. */ | |
020709f9 | 3295 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3296 | } |
3297 | ||
3298 | /* Send Link State Request. */ | |
3299 | void | |
3300 | ospf_ls_req_send (struct ospf_neighbor *nbr) | |
3301 | { | |
3302 | struct ospf_interface *oi; | |
3303 | struct ospf_packet *op; | |
3304 | u_int16_t length = OSPF_HEADER_SIZE; | |
3305 | ||
3306 | oi = nbr->oi; | |
3307 | op = ospf_packet_new (oi->ifp->mtu); | |
3308 | ||
3309 | /* Prepare OSPF common header. */ | |
3310 | ospf_make_header (OSPF_MSG_LS_REQ, oi, op->s); | |
3311 | ||
3312 | /* Prepare OSPF Link State Request body. */ | |
3313 | length += ospf_make_ls_req (nbr, op->s); | |
3314 | if (length == OSPF_HEADER_SIZE) | |
3315 | { | |
3316 | ospf_packet_free (op); | |
3317 | return; | |
3318 | } | |
3319 | ||
3320 | /* Fill OSPF header. */ | |
3321 | ospf_fill_header (oi, op->s, length); | |
3322 | ||
3323 | /* Set packet length. */ | |
3324 | op->length = length; | |
3325 | ||
3326 | /* Decide destination address. */ | |
53d0dece JT |
3327 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3328 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3329 | else | |
3330 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3331 | |
3332 | /* Add packet to the interface output queue. */ | |
3333 | ospf_packet_add (oi, op); | |
3334 | ||
3335 | /* Hook thread to write packet. */ | |
020709f9 | 3336 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3337 | |
3338 | /* Add Link State Request Retransmission Timer. */ | |
3339 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
3340 | } | |
3341 | ||
3342 | /* Send Link State Update with an LSA. */ | |
3343 | void | |
3344 | ospf_ls_upd_send_lsa (struct ospf_neighbor *nbr, struct ospf_lsa *lsa, | |
3345 | int flag) | |
3346 | { | |
52dc7ee6 | 3347 | struct list *update; |
718e3744 | 3348 | |
3349 | update = list_new (); | |
3350 | ||
3351 | listnode_add (update, lsa); | |
3352 | ospf_ls_upd_send (nbr, update, flag); | |
3353 | ||
3354 | list_delete (update); | |
3355 | } | |
3356 | ||
68b7339a | 3357 | /* Determine size for packet. Must be at least big enough to accomodate next |
3358 | * LSA on list, which may be bigger than MTU size. | |
3359 | * | |
3360 | * Return pointer to new ospf_packet | |
3361 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3362 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3363 | */ | |
3364 | static struct ospf_packet * | |
3365 | ospf_ls_upd_packet_new (struct list *update, struct ospf_interface *oi) | |
3366 | { | |
3367 | struct ospf_lsa *lsa; | |
3368 | struct listnode *ln; | |
3369 | size_t size; | |
3370 | static char warned = 0; | |
3371 | ||
1eb8ef25 | 3372 | lsa = listgetdata((ln = listhead (update))); |
68b7339a | 3373 | assert (lsa->data); |
3374 | ||
3375 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs (lsa->data->length)) | |
3376 | > ospf_packet_max (oi)) | |
3377 | { | |
3378 | if (!warned) | |
3379 | { | |
3380 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA encountered!" | |
3381 | "will need to fragment. Not optimal. Try divide up" | |
3382 | " your network with areas. Use 'debug ospf packet send'" | |
3383 | " to see details, or look at 'show ip ospf database ..'"); | |
3384 | warned = 1; | |
3385 | } | |
3386 | ||
3387 | if (IS_DEBUG_OSPF_PACKET (0, SEND)) | |
2a42e285 | 3388 | zlog_debug ("ospf_ls_upd_packet_new: oversized LSA id:%s," |
68b7339a | 3389 | " %d bytes originated by %s, will be fragmented!", |
3390 | inet_ntoa (lsa->data->id), | |
3391 | ntohs (lsa->data->length), | |
3392 | inet_ntoa (lsa->data->adv_router)); | |
3393 | ||
3394 | /* | |
3395 | * Allocate just enough to fit this LSA only, to avoid including other | |
3396 | * LSAs in fragmented LSA Updates. | |
3397 | */ | |
3398 | size = ntohs (lsa->data->length) + (oi->ifp->mtu - ospf_packet_max (oi)) | |
3399 | + OSPF_LS_UPD_MIN_SIZE; | |
3400 | } | |
3401 | else | |
3402 | size = oi->ifp->mtu; | |
3403 | ||
3404 | if (size > OSPF_MAX_PACKET_SIZE) | |
3405 | { | |
3406 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA id:%s too big," | |
64511f39 | 3407 | " %d bytes, packet size %ld, dropping it completely." |
68b7339a | 3408 | " OSPF routing is broken!", |
37ccfa3d | 3409 | inet_ntoa (lsa->data->id), ntohs (lsa->data->length), |
62d8e96a | 3410 | (long int) size); |
68b7339a | 3411 | list_delete_node (update, ln); |
3412 | return NULL; | |
3413 | } | |
3414 | ||
c9035ccd DT |
3415 | /* IP header is built up separately by ospf_write(). This means, that we must |
3416 | * reduce the "affordable" size just calculated by length of an IP header. | |
3417 | * This makes sure, that even if we manage to fill the payload with LSA data | |
3418 | * completely, the final packet (our data plus IP header) still fits into | |
3419 | * outgoing interface MTU. This correction isn't really meaningful for an | |
3420 | * oversized LSA, but for consistency the correction is done for both cases. | |
3421 | * | |
3422 | * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size | |
3423 | */ | |
3424 | return ospf_packet_new (size - sizeof (struct ip)); | |
68b7339a | 3425 | } |
3426 | ||
718e3744 | 3427 | static void |
52dc7ee6 | 3428 | ospf_ls_upd_queue_send (struct ospf_interface *oi, struct list *update, |
718e3744 | 3429 | struct in_addr addr) |
3430 | { | |
3431 | struct ospf_packet *op; | |
3432 | u_int16_t length = OSPF_HEADER_SIZE; | |
3433 | ||
3434 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3435 | zlog_debug ("listcount = %d, dst %s", listcount (update), inet_ntoa(addr)); |
68b7339a | 3436 | |
3437 | op = ospf_ls_upd_packet_new (update, oi); | |
718e3744 | 3438 | |
3439 | /* Prepare OSPF common header. */ | |
3440 | ospf_make_header (OSPF_MSG_LS_UPD, oi, op->s); | |
3441 | ||
59ea14c6 | 3442 | /* Prepare OSPF Link State Update body. |
3443 | * Includes Type-7 translation. | |
3444 | */ | |
718e3744 | 3445 | length += ospf_make_ls_upd (oi, update, op->s); |
3446 | ||
3447 | /* Fill OSPF header. */ | |
3448 | ospf_fill_header (oi, op->s, length); | |
3449 | ||
3450 | /* Set packet length. */ | |
3451 | op->length = length; | |
3452 | ||
3453 | /* Decide destination address. */ | |
53d0dece JT |
3454 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3455 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3456 | else | |
3457 | op->dst.s_addr = addr.s_addr; | |
718e3744 | 3458 | |
3459 | /* Add packet to the interface output queue. */ | |
3460 | ospf_packet_add (oi, op); | |
3461 | ||
3462 | /* Hook thread to write packet. */ | |
020709f9 | 3463 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3464 | } |
3465 | ||
3466 | static int | |
3467 | ospf_ls_upd_send_queue_event (struct thread *thread) | |
3468 | { | |
3469 | struct ospf_interface *oi = THREAD_ARG(thread); | |
3470 | struct route_node *rn; | |
736d3441 | 3471 | struct route_node *rnext; |
59ea14c6 | 3472 | struct list *update; |
68b7339a | 3473 | char again = 0; |
718e3744 | 3474 | |
3475 | oi->t_ls_upd_event = NULL; | |
3476 | ||
3477 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3478 | zlog_debug ("ospf_ls_upd_send_queue start"); |
718e3744 | 3479 | |
736d3441 | 3480 | for (rn = route_top (oi->ls_upd_queue); rn; rn = rnext) |
718e3744 | 3481 | { |
736d3441 | 3482 | rnext = route_next (rn); |
3483 | ||
718e3744 | 3484 | if (rn->info == NULL) |
736d3441 | 3485 | continue; |
68b7339a | 3486 | |
3487 | update = (struct list *)rn->info; | |
718e3744 | 3488 | |
48fe13bf | 3489 | ospf_ls_upd_queue_send (oi, update, rn->p.u.prefix4); |
718e3744 | 3490 | |
68b7339a | 3491 | /* list might not be empty. */ |
59ea14c6 | 3492 | if (listcount(update) == 0) |
3493 | { | |
3494 | list_delete (rn->info); | |
3495 | rn->info = NULL; | |
3496 | route_unlock_node (rn); | |
3497 | } | |
3498 | else | |
68b7339a | 3499 | again = 1; |
59ea14c6 | 3500 | } |
3501 | ||
3502 | if (again != 0) | |
3503 | { | |
3504 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3505 | zlog_debug ("ospf_ls_upd_send_queue: update lists not cleared," |
59ea14c6 | 3506 | " %d nodes to try again, raising new event", again); |
3507 | oi->t_ls_upd_event = | |
3508 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
718e3744 | 3509 | } |
3510 | ||
3511 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3512 | zlog_debug ("ospf_ls_upd_send_queue stop"); |
59ea14c6 | 3513 | |
718e3744 | 3514 | return 0; |
3515 | } | |
3516 | ||
3517 | void | |
52dc7ee6 | 3518 | ospf_ls_upd_send (struct ospf_neighbor *nbr, struct list *update, int flag) |
718e3744 | 3519 | { |
3520 | struct ospf_interface *oi; | |
1eb8ef25 | 3521 | struct ospf_lsa *lsa; |
718e3744 | 3522 | struct prefix_ipv4 p; |
3523 | struct route_node *rn; | |
1eb8ef25 | 3524 | struct listnode *node; |
718e3744 | 3525 | |
3526 | oi = nbr->oi; | |
3527 | ||
3528 | p.family = AF_INET; | |
3529 | p.prefixlen = IPV4_MAX_BITLEN; | |
3530 | ||
3531 | /* Decide destination address. */ | |
3532 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3533 | p.prefix = oi->vl_data->peer_addr; | |
53d0dece JT |
3534 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3535 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3536 | else if (flag == OSPF_SEND_PACKET_DIRECT) |
3537 | p.prefix = nbr->address.u.prefix4; | |
3538 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3539 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
7afa08da | 3540 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3541 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3542 | else |
3543 | p.prefix.s_addr = htonl (OSPF_ALLDROUTERS); | |
3544 | ||
3545 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3546 | { | |
3547 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
3548 | zlog_warn ("* LS-Update is directly sent on NBMA network."); | |
3549 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix.s_addr)) | |
3550 | zlog_warn ("* LS-Update is sent to myself."); | |
3551 | } | |
3552 | ||
3553 | rn = route_node_get (oi->ls_upd_queue, (struct prefix *) &p); | |
3554 | ||
3555 | if (rn->info == NULL) | |
3556 | rn->info = list_new (); | |
3557 | ||
1eb8ef25 | 3558 | for (ALL_LIST_ELEMENTS_RO (update, node, lsa)) |
1fe6ed38 | 3559 | listnode_add (rn->info, ospf_lsa_lock (lsa)); /* oi->ls_upd_queue */ |
718e3744 | 3560 | |
3561 | if (oi->t_ls_upd_event == NULL) | |
3562 | oi->t_ls_upd_event = | |
3563 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
3564 | } | |
3565 | ||
3566 | static void | |
52dc7ee6 | 3567 | ospf_ls_ack_send_list (struct ospf_interface *oi, struct list *ack, |
3568 | struct in_addr dst) | |
718e3744 | 3569 | { |
3570 | struct ospf_packet *op; | |
3571 | u_int16_t length = OSPF_HEADER_SIZE; | |
3572 | ||
3573 | op = ospf_packet_new (oi->ifp->mtu); | |
3574 | ||
3575 | /* Prepare OSPF common header. */ | |
3576 | ospf_make_header (OSPF_MSG_LS_ACK, oi, op->s); | |
3577 | ||
3578 | /* Prepare OSPF Link State Acknowledgment body. */ | |
3579 | length += ospf_make_ls_ack (oi, ack, op->s); | |
3580 | ||
3581 | /* Fill OSPF header. */ | |
3582 | ospf_fill_header (oi, op->s, length); | |
3583 | ||
3584 | /* Set packet length. */ | |
3585 | op->length = length; | |
3586 | ||
3587 | /* Set destination IP address. */ | |
3588 | op->dst = dst; | |
3589 | ||
3590 | /* Add packet to the interface output queue. */ | |
3591 | ospf_packet_add (oi, op); | |
3592 | ||
3593 | /* Hook thread to write packet. */ | |
020709f9 | 3594 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3595 | } |
3596 | ||
3597 | static int | |
3598 | ospf_ls_ack_send_event (struct thread *thread) | |
3599 | { | |
3600 | struct ospf_interface *oi = THREAD_ARG (thread); | |
3601 | ||
3602 | oi->t_ls_ack_direct = NULL; | |
3603 | ||
3604 | while (listcount (oi->ls_ack_direct.ls_ack)) | |
3605 | ospf_ls_ack_send_list (oi, oi->ls_ack_direct.ls_ack, | |
3606 | oi->ls_ack_direct.dst); | |
3607 | ||
3608 | return 0; | |
3609 | } | |
3610 | ||
3611 | void | |
3612 | ospf_ls_ack_send (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
3613 | { | |
3614 | struct ospf_interface *oi = nbr->oi; | |
3615 | ||
3616 | if (listcount (oi->ls_ack_direct.ls_ack) == 0) | |
3617 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
3618 | ||
3619 | listnode_add (oi->ls_ack_direct.ls_ack, ospf_lsa_lock (lsa)); | |
3620 | ||
3621 | if (oi->t_ls_ack_direct == NULL) | |
3622 | oi->t_ls_ack_direct = | |
3623 | thread_add_event (master, ospf_ls_ack_send_event, oi, 0); | |
3624 | } | |
3625 | ||
3626 | /* Send Link State Acknowledgment delayed. */ | |
3627 | void | |
3628 | ospf_ls_ack_send_delayed (struct ospf_interface *oi) | |
3629 | { | |
3630 | struct in_addr dst; | |
3631 | ||
3632 | /* Decide destination address. */ | |
3633 | /* RFC2328 Section 13.5 On non-broadcast | |
3634 | networks, delayed Link State Acknowledgment packets must be | |
3635 | unicast separately over each adjacency (i.e., neighbor whose | |
3636 | state is >= Exchange). */ | |
3637 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3638 | { | |
3639 | struct ospf_neighbor *nbr; | |
3640 | struct route_node *rn; | |
3641 | ||
3642 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3643 | if ((nbr = rn->info) != NULL) | |
3644 | if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange) | |
3645 | while (listcount (oi->ls_ack)) | |
3646 | ospf_ls_ack_send_list (oi, oi->ls_ack, nbr->address.u.prefix4); | |
3647 | return; | |
3648 | } | |
3649 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3650 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
3651 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3652 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3653 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3654 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
630e4807 | 3655 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3656 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3657 | else |
3658 | dst.s_addr = htonl (OSPF_ALLDROUTERS); | |
3659 | ||
3660 | while (listcount (oi->ls_ack)) | |
3661 | ospf_ls_ack_send_list (oi, oi->ls_ack, dst); | |
3662 | } |