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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 | ||
4e31de79 DO |
76 | /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular |
77 | types, offset is the "LSA type" field. */ | |
78 | static const u_int16_t ospf_lsa_minlen[] = | |
79 | { | |
80 | 0, | |
81 | OSPF_ROUTER_LSA_MIN_SIZE, | |
82 | OSPF_NETWORK_LSA_MIN_SIZE, | |
83 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
84 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
85 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
86 | 0, | |
87 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
88 | 0, | |
89 | 0, | |
90 | 0, | |
91 | 0, | |
92 | }; | |
93 | ||
bd5651f0 DO |
94 | /* for ospf_check_auth() */ |
95 | static int ospf_check_sum (struct ospf_header *); | |
96 | ||
718e3744 | 97 | /* OSPF authentication checking function */ |
4dadc291 | 98 | static int |
718e3744 | 99 | ospf_auth_type (struct ospf_interface *oi) |
100 | { | |
101 | int auth_type; | |
102 | ||
103 | if (OSPF_IF_PARAM (oi, auth_type) == OSPF_AUTH_NOTSET) | |
104 | auth_type = oi->area->auth_type; | |
105 | else | |
106 | auth_type = OSPF_IF_PARAM (oi, auth_type); | |
107 | ||
108 | /* Handle case where MD5 key list is not configured aka Cisco */ | |
109 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC && | |
110 | list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
111 | return OSPF_AUTH_NULL; | |
112 | ||
113 | return auth_type; | |
114 | ||
115 | } | |
116 | ||
718e3744 | 117 | struct ospf_packet * |
118 | ospf_packet_new (size_t size) | |
119 | { | |
120 | struct ospf_packet *new; | |
121 | ||
122 | new = XCALLOC (MTYPE_OSPF_PACKET, sizeof (struct ospf_packet)); | |
123 | new->s = stream_new (size); | |
124 | ||
125 | return new; | |
126 | } | |
127 | ||
128 | void | |
129 | ospf_packet_free (struct ospf_packet *op) | |
130 | { | |
131 | if (op->s) | |
132 | stream_free (op->s); | |
133 | ||
134 | XFREE (MTYPE_OSPF_PACKET, op); | |
135 | ||
136 | op = NULL; | |
137 | } | |
138 | ||
139 | struct ospf_fifo * | |
140 | ospf_fifo_new () | |
141 | { | |
142 | struct ospf_fifo *new; | |
143 | ||
144 | new = XCALLOC (MTYPE_OSPF_FIFO, sizeof (struct ospf_fifo)); | |
145 | return new; | |
146 | } | |
147 | ||
148 | /* Add new packet to fifo. */ | |
149 | void | |
150 | ospf_fifo_push (struct ospf_fifo *fifo, struct ospf_packet *op) | |
151 | { | |
152 | if (fifo->tail) | |
153 | fifo->tail->next = op; | |
154 | else | |
155 | fifo->head = op; | |
156 | ||
157 | fifo->tail = op; | |
158 | ||
159 | fifo->count++; | |
160 | } | |
161 | ||
aa276fd7 PJ |
162 | /* Add new packet to head of fifo. */ |
163 | static void | |
164 | ospf_fifo_push_head (struct ospf_fifo *fifo, struct ospf_packet *op) | |
165 | { | |
166 | op->next = fifo->head; | |
167 | ||
168 | if (fifo->tail == NULL) | |
169 | fifo->tail = op; | |
170 | ||
171 | fifo->head = op; | |
172 | ||
173 | fifo->count++; | |
174 | } | |
175 | ||
718e3744 | 176 | /* Delete first packet from fifo. */ |
177 | struct ospf_packet * | |
178 | ospf_fifo_pop (struct ospf_fifo *fifo) | |
179 | { | |
180 | struct ospf_packet *op; | |
181 | ||
182 | op = fifo->head; | |
183 | ||
184 | if (op) | |
185 | { | |
186 | fifo->head = op->next; | |
187 | ||
188 | if (fifo->head == NULL) | |
189 | fifo->tail = NULL; | |
190 | ||
191 | fifo->count--; | |
192 | } | |
193 | ||
194 | return op; | |
195 | } | |
196 | ||
197 | /* Return first fifo entry. */ | |
198 | struct ospf_packet * | |
199 | ospf_fifo_head (struct ospf_fifo *fifo) | |
200 | { | |
201 | return fifo->head; | |
202 | } | |
203 | ||
204 | /* Flush ospf packet fifo. */ | |
205 | void | |
206 | ospf_fifo_flush (struct ospf_fifo *fifo) | |
207 | { | |
208 | struct ospf_packet *op; | |
209 | struct ospf_packet *next; | |
210 | ||
211 | for (op = fifo->head; op; op = next) | |
212 | { | |
213 | next = op->next; | |
214 | ospf_packet_free (op); | |
215 | } | |
216 | fifo->head = fifo->tail = NULL; | |
217 | fifo->count = 0; | |
218 | } | |
219 | ||
220 | /* Free ospf packet fifo. */ | |
221 | void | |
222 | ospf_fifo_free (struct ospf_fifo *fifo) | |
223 | { | |
224 | ospf_fifo_flush (fifo); | |
225 | ||
226 | XFREE (MTYPE_OSPF_FIFO, fifo); | |
227 | } | |
228 | ||
229 | void | |
230 | ospf_packet_add (struct ospf_interface *oi, struct ospf_packet *op) | |
231 | { | |
c3eab871 | 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), | |
272ca1e3 | 238 | LOOKUP (ospf_packet_type_str, stream_getc_from(op->s, 1)), |
c3eab871 | 239 | inet_ntoa (op->dst)); |
240 | return; | |
241 | } | |
242 | ||
718e3744 | 243 | /* Add packet to end of queue. */ |
244 | ospf_fifo_push (oi->obuf, op); | |
245 | ||
246 | /* Debug of packet fifo*/ | |
247 | /* ospf_fifo_debug (oi->obuf); */ | |
248 | } | |
249 | ||
aa276fd7 PJ |
250 | static void |
251 | ospf_packet_add_top (struct ospf_interface *oi, struct ospf_packet *op) | |
252 | { | |
253 | if (!oi->obuf) | |
254 | { | |
255 | zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
256 | "destination %s) called with NULL obuf, ignoring " | |
257 | "(please report this bug)!\n", | |
258 | IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state), | |
7e0e2cb1 | 259 | LOOKUP (ospf_packet_type_str, stream_getc_from(op->s, 1)), |
aa276fd7 PJ |
260 | inet_ntoa (op->dst)); |
261 | return; | |
262 | } | |
263 | ||
264 | /* Add packet to head of queue. */ | |
265 | ospf_fifo_push_head (oi->obuf, op); | |
266 | ||
267 | /* Debug of packet fifo*/ | |
268 | /* ospf_fifo_debug (oi->obuf); */ | |
269 | } | |
270 | ||
718e3744 | 271 | void |
272 | ospf_packet_delete (struct ospf_interface *oi) | |
273 | { | |
274 | struct ospf_packet *op; | |
275 | ||
276 | op = ospf_fifo_pop (oi->obuf); | |
277 | ||
278 | if (op) | |
279 | ospf_packet_free (op); | |
280 | } | |
281 | ||
718e3744 | 282 | struct ospf_packet * |
283 | ospf_packet_dup (struct ospf_packet *op) | |
284 | { | |
285 | struct ospf_packet *new; | |
286 | ||
37163d6d | 287 | if (stream_get_endp(op->s) != op->length) |
08c83671 AS |
288 | /* XXX size_t */ |
289 | zlog_warn ("ospf_packet_dup stream %lu ospf_packet %u size mismatch", | |
290 | (u_long)STREAM_SIZE(op->s), op->length); | |
30961a15 | 291 | |
292 | /* Reserve space for MD5 authentication that may be added later. */ | |
293 | new = ospf_packet_new (stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
fa81b713 | 294 | stream_copy (new->s, op->s); |
718e3744 | 295 | |
296 | new->dst = op->dst; | |
297 | new->length = op->length; | |
298 | ||
299 | return new; | |
300 | } | |
301 | ||
86f1fd96 | 302 | /* XXX inline */ |
f63f06da | 303 | static unsigned int |
86f1fd96 | 304 | ospf_packet_authspace (struct ospf_interface *oi) |
305 | { | |
306 | int auth = 0; | |
307 | ||
308 | if ( ospf_auth_type (oi) == OSPF_AUTH_CRYPTOGRAPHIC) | |
309 | auth = OSPF_AUTH_MD5_SIZE; | |
310 | ||
311 | return auth; | |
312 | } | |
313 | ||
4dadc291 | 314 | static unsigned int |
718e3744 | 315 | ospf_packet_max (struct ospf_interface *oi) |
316 | { | |
317 | int max; | |
318 | ||
86f1fd96 | 319 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
320 | ||
68b7339a | 321 | max -= (OSPF_HEADER_SIZE + sizeof (struct ip)); |
718e3744 | 322 | |
323 | return max; | |
324 | } | |
325 | ||
6b0655a2 | 326 | |
4dadc291 | 327 | static int |
2d8223c5 | 328 | ospf_check_md5_digest (struct ospf_interface *oi, struct ospf_header *ospfh) |
718e3744 | 329 | { |
c1a03d47 | 330 | MD5_CTX ctx; |
718e3744 | 331 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; |
718e3744 | 332 | struct crypt_key *ck; |
718e3744 | 333 | struct ospf_neighbor *nbr; |
2d8223c5 | 334 | u_int16_t length = ntohs (ospfh->length); |
718e3744 | 335 | |
718e3744 | 336 | /* Get secret key. */ |
337 | ck = ospf_crypt_key_lookup (OSPF_IF_PARAM (oi, auth_crypt), | |
338 | ospfh->u.crypt.key_id); | |
339 | if (ck == NULL) | |
340 | { | |
341 | zlog_warn ("interface %s: ospf_check_md5 no key %d", | |
342 | IF_NAME (oi), ospfh->u.crypt.key_id); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | /* check crypto seqnum. */ | |
347 | nbr = ospf_nbr_lookup_by_routerid (oi->nbrs, &ospfh->router_id); | |
348 | ||
349 | if (nbr && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) | |
350 | { | |
351 | zlog_warn ("interface %s: ospf_check_md5 bad sequence %d (expect %d)", | |
352 | IF_NAME (oi), | |
353 | ntohl(ospfh->u.crypt.crypt_seqnum), | |
354 | ntohl(nbr->crypt_seqnum)); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /* Generate a digest for the ospf packet - their digest + our digest. */ | |
c1a03d47 | 359 | memset(&ctx, 0, sizeof(ctx)); |
360 | MD5Init(&ctx); | |
2d8223c5 | 361 | MD5Update(&ctx, ospfh, length); |
c1a03d47 | 362 | MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); |
363 | MD5Final(digest, &ctx); | |
718e3744 | 364 | |
365 | /* compare the two */ | |
2d8223c5 | 366 | if (memcmp ((caddr_t)ospfh + length, digest, OSPF_AUTH_MD5_SIZE)) |
718e3744 | 367 | { |
368 | zlog_warn ("interface %s: ospf_check_md5 checksum mismatch", | |
369 | IF_NAME (oi)); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | /* save neighbor's crypt_seqnum */ | |
374 | if (nbr) | |
375 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
376 | return 1; | |
377 | } | |
378 | ||
379 | /* This function is called from ospf_write(), it will detect the | |
380 | authentication scheme and if it is MD5, it will change the sequence | |
381 | and update the MD5 digest. */ | |
4dadc291 | 382 | static int |
718e3744 | 383 | ospf_make_md5_digest (struct ospf_interface *oi, struct ospf_packet *op) |
384 | { | |
385 | struct ospf_header *ospfh; | |
386 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; | |
c1a03d47 | 387 | MD5_CTX ctx; |
718e3744 | 388 | void *ibuf; |
9483e155 | 389 | u_int32_t t; |
718e3744 | 390 | struct crypt_key *ck; |
3623814a | 391 | const u_int8_t *auth_key; |
718e3744 | 392 | |
393 | ibuf = STREAM_DATA (op->s); | |
394 | ospfh = (struct ospf_header *) ibuf; | |
395 | ||
396 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
397 | return 0; | |
398 | ||
399 | /* We do this here so when we dup a packet, we don't have to | |
2518efd1 PJ |
400 | waste CPU rewriting other headers. |
401 | ||
402 | Note that quagga_time /deliberately/ is not used here */ | |
9483e155 | 403 | t = (time(NULL) & 0xFFFFFFFF); |
818e56cf | 404 | if (t > oi->crypt_seqnum) |
405 | oi->crypt_seqnum = t; | |
406 | else | |
407 | oi->crypt_seqnum++; | |
408 | ||
9483e155 | 409 | ospfh->u.crypt.crypt_seqnum = htonl (oi->crypt_seqnum); |
718e3744 | 410 | |
411 | /* Get MD5 Authentication key from auth_key list. */ | |
412 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
3623814a | 413 | auth_key = (const u_int8_t *) ""; |
718e3744 | 414 | else |
415 | { | |
1eb8ef25 | 416 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
4dadc291 | 417 | auth_key = ck->auth_key; |
718e3744 | 418 | } |
419 | ||
420 | /* Generate a digest for the entire packet + our secret key. */ | |
c1a03d47 | 421 | memset(&ctx, 0, sizeof(ctx)); |
422 | MD5Init(&ctx); | |
423 | MD5Update(&ctx, ibuf, ntohs (ospfh->length)); | |
424 | MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
425 | MD5Final(digest, &ctx); | |
718e3744 | 426 | |
427 | /* Append md5 digest to the end of the stream. */ | |
718e3744 | 428 | stream_put (op->s, digest, OSPF_AUTH_MD5_SIZE); |
718e3744 | 429 | |
430 | /* We do *NOT* increment the OSPF header length. */ | |
30961a15 | 431 | op->length = ntohs (ospfh->length) + OSPF_AUTH_MD5_SIZE; |
432 | ||
37163d6d | 433 | if (stream_get_endp(op->s) != op->length) |
08c83671 AS |
434 | /* XXX size_t */ |
435 | zlog_warn("ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u", | |
436 | (u_long)stream_get_endp(op->s), op->length); | |
718e3744 | 437 | |
438 | return OSPF_AUTH_MD5_SIZE; | |
439 | } | |
440 | ||
6b0655a2 | 441 | |
4dadc291 | 442 | static int |
718e3744 | 443 | ospf_ls_req_timer (struct thread *thread) |
444 | { | |
445 | struct ospf_neighbor *nbr; | |
446 | ||
447 | nbr = THREAD_ARG (thread); | |
448 | nbr->t_ls_req = NULL; | |
449 | ||
450 | /* Send Link State Request. */ | |
451 | if (ospf_ls_request_count (nbr)) | |
452 | ospf_ls_req_send (nbr); | |
453 | ||
454 | /* Set Link State Request retransmission timer. */ | |
455 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | void | |
461 | ospf_ls_req_event (struct ospf_neighbor *nbr) | |
462 | { | |
463 | if (nbr->t_ls_req) | |
464 | { | |
465 | thread_cancel (nbr->t_ls_req); | |
466 | nbr->t_ls_req = NULL; | |
467 | } | |
468 | nbr->t_ls_req = thread_add_event (master, ospf_ls_req_timer, nbr, 0); | |
469 | } | |
470 | ||
471 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
472 | ospf_neighbor.c */ | |
473 | int | |
474 | ospf_ls_upd_timer (struct thread *thread) | |
475 | { | |
476 | struct ospf_neighbor *nbr; | |
477 | ||
478 | nbr = THREAD_ARG (thread); | |
479 | nbr->t_ls_upd = NULL; | |
480 | ||
481 | /* Send Link State Update. */ | |
482 | if (ospf_ls_retransmit_count (nbr) > 0) | |
483 | { | |
52dc7ee6 | 484 | struct list *update; |
718e3744 | 485 | struct ospf_lsdb *lsdb; |
486 | int i; | |
718e3744 | 487 | int retransmit_interval; |
488 | ||
718e3744 | 489 | retransmit_interval = OSPF_IF_PARAM (nbr->oi, retransmit_interval); |
490 | ||
491 | lsdb = &nbr->ls_rxmt; | |
492 | update = list_new (); | |
493 | ||
494 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
495 | { | |
496 | struct route_table *table = lsdb->type[i].db; | |
497 | struct route_node *rn; | |
498 | ||
499 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
500 | { | |
501 | struct ospf_lsa *lsa; | |
502 | ||
503 | if ((lsa = rn->info) != NULL) | |
504 | /* Don't retransmit an LSA if we received it within | |
505 | the last RxmtInterval seconds - this is to allow the | |
506 | neighbour a chance to acknowledge the LSA as it may | |
507 | have ben just received before the retransmit timer | |
508 | fired. This is a small tweak to what is in the RFC, | |
509 | but it will cut out out a lot of retransmit traffic | |
510 | - MAG */ | |
2518efd1 | 511 | if (tv_cmp (tv_sub (recent_relative_time (), lsa->tv_recv), |
718e3744 | 512 | int2tv (retransmit_interval)) >= 0) |
513 | listnode_add (update, rn->info); | |
514 | } | |
515 | } | |
516 | ||
517 | if (listcount (update) > 0) | |
518 | ospf_ls_upd_send (nbr, update, OSPF_SEND_PACKET_DIRECT); | |
519 | list_delete (update); | |
520 | } | |
521 | ||
522 | /* Set LS Update retransmission timer. */ | |
523 | OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | int | |
529 | ospf_ls_ack_timer (struct thread *thread) | |
530 | { | |
531 | struct ospf_interface *oi; | |
532 | ||
533 | oi = THREAD_ARG (thread); | |
534 | oi->t_ls_ack = NULL; | |
535 | ||
536 | /* Send Link State Acknowledgment. */ | |
537 | if (listcount (oi->ls_ack) > 0) | |
538 | ospf_ls_ack_send_delayed (oi); | |
539 | ||
540 | /* Set LS Ack timer. */ | |
541 | OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
0bfeca3f | 546 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
5dcbdf82 | 547 | static void |
6a99f831 | 548 | ospf_write_frags (int fd, struct ospf_packet *op, struct ip *iph, |
62d8e96a | 549 | struct msghdr *msg, unsigned int maxdatasize, |
37ccfa3d | 550 | unsigned int mtu, int flags, u_char type) |
0bfeca3f | 551 | { |
552 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
6a99f831 | 553 | u_int16_t offset; |
62d8e96a | 554 | struct iovec *iovp; |
6a99f831 | 555 | int ret; |
0bfeca3f | 556 | |
557 | assert ( op->length == stream_get_endp(op->s) ); | |
62d8e96a | 558 | assert (msg->msg_iovlen == 2); |
0bfeca3f | 559 | |
560 | /* we can but try. | |
561 | * | |
562 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
563 | * well as the IP_MF flag, making this all quite pointless. | |
564 | * | |
565 | * However, for a system on which IP_MF is left alone, and ip_id left | |
566 | * alone or else which sets same ip_id for each fragment this might | |
567 | * work, eg linux. | |
568 | * | |
569 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
570 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
571 | * be raised against the various kernels. | |
572 | */ | |
573 | ||
574 | /* set More Frag */ | |
575 | iph->ip_off |= IP_MF; | |
576 | ||
577 | /* ip frag offset is expressed in units of 8byte words */ | |
578 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
579 | ||
62d8e96a | 580 | iovp = &msg->msg_iov[1]; |
581 | ||
0bfeca3f | 582 | while ( (stream_get_endp(op->s) - stream_get_getp (op->s)) |
583 | > maxdatasize ) | |
584 | { | |
585 | /* data length of this frag is to next offset value */ | |
62d8e96a | 586 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; |
587 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
6a99f831 | 588 | assert (iph->ip_len <= mtu); |
0bfeca3f | 589 | |
18b12c38 | 590 | sockopt_iphdrincl_swab_htosys (iph); |
0bfeca3f | 591 | |
6a99f831 | 592 | ret = sendmsg (fd, msg, flags); |
0bfeca3f | 593 | |
18b12c38 | 594 | sockopt_iphdrincl_swab_systoh (iph); |
0bfeca3f | 595 | |
596 | if (ret < 0) | |
37ccfa3d | 597 | zlog_warn ("*** ospf_write_frags: sendmsg failed to %s," |
5dcbdf82 | 598 | " id %d, off %d, len %d, mtu %u failed with %s", |
599 | inet_ntoa (iph->ip_dst), | |
600 | iph->ip_id, | |
601 | iph->ip_off, | |
602 | iph->ip_len, | |
603 | mtu, | |
604 | safe_strerror (errno)); | |
0bfeca3f | 605 | |
37ccfa3d | 606 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) |
607 | { | |
2a42e285 | 608 | zlog_debug ("ospf_write_frags: sent id %d, off %d, len %d to %s\n", |
37ccfa3d | 609 | iph->ip_id, iph->ip_off, iph->ip_len, |
610 | inet_ntoa (iph->ip_dst)); | |
611 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
612 | { | |
2a42e285 | 613 | zlog_debug ("-----------------IP Header Dump----------------------"); |
37ccfa3d | 614 | ospf_ip_header_dump (iph); |
2a42e285 | 615 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 616 | } |
617 | } | |
618 | ||
0bfeca3f | 619 | iph->ip_off += offset; |
9985f83c | 620 | stream_forward_getp (op->s, iovp->iov_len); |
62d8e96a | 621 | iovp->iov_base = STREAM_PNT (op->s); |
0bfeca3f | 622 | } |
623 | ||
624 | /* setup for final fragment */ | |
62d8e96a | 625 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp (op->s); |
626 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
0bfeca3f | 627 | iph->ip_off &= (~IP_MF); |
628 | } | |
629 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
630 | ||
5dcbdf82 | 631 | static int |
718e3744 | 632 | ospf_write (struct thread *thread) |
633 | { | |
68980084 | 634 | struct ospf *ospf = THREAD_ARG (thread); |
718e3744 | 635 | struct ospf_interface *oi; |
e8f45e82 | 636 | struct ospf_interface *last_serviced_oi = NULL; |
718e3744 | 637 | struct ospf_packet *op; |
638 | struct sockaddr_in sa_dst; | |
718e3744 | 639 | struct ip iph; |
640 | struct msghdr msg; | |
62d8e96a | 641 | struct iovec iov[2]; |
68980084 | 642 | u_char type; |
643 | int ret; | |
644 | int flags = 0; | |
52dc7ee6 | 645 | struct listnode *node; |
0bfeca3f | 646 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 647 | static u_int16_t ipid = 0; |
0bfeca3f | 648 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
6a99f831 | 649 | u_int16_t maxdatasize; |
68b7339a | 650 | #define OSPF_WRITE_IPHL_SHIFT 2 |
2f8f370e | 651 | int pkt_count = 0; |
718e3744 | 652 | |
68980084 | 653 | ospf->t_write = NULL; |
718e3744 | 654 | |
68980084 | 655 | node = listhead (ospf->oi_write_q); |
718e3744 | 656 | assert (node); |
1eb8ef25 | 657 | oi = listgetdata (node); |
718e3744 | 658 | assert (oi); |
0bfeca3f | 659 | |
660 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
68b7339a | 661 | /* seed ipid static with low order bits of time */ |
662 | if (ipid == 0) | |
663 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 664 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
665 | ||
e8f45e82 | 666 | while ((pkt_count < ospf->write_oi_count) && oi && (last_serviced_oi != oi)) |
2f8f370e | 667 | { |
e8f45e82 DS |
668 | /* If there is only packet in the queue, the oi is removed from |
669 | write-q, so fix up the last interface that was serviced */ | |
670 | if (last_serviced_oi == NULL) { | |
671 | last_serviced_oi = oi; | |
672 | } | |
2f8f370e | 673 | pkt_count++; |
e8f45e82 DS |
674 | /* convenience - max OSPF data per packet, |
675 | * and reliability - not more data, than our | |
676 | * socket can accept | |
677 | */ | |
678 | maxdatasize = MIN (oi->ifp->mtu, ospf->maxsndbuflen) - | |
679 | sizeof (struct ip); | |
680 | ||
2f8f370e DS |
681 | /* Get one packet from queue. */ |
682 | op = ospf_fifo_head (oi->obuf); | |
683 | assert (op); | |
684 | assert (op->length >= OSPF_HEADER_SIZE); | |
685 | ||
686 | if (op->dst.s_addr == htonl (OSPF_ALLSPFROUTERS) | |
687 | || op->dst.s_addr == htonl (OSPF_ALLDROUTERS)) | |
688 | ospf_if_ipmulticast (ospf, oi->address, oi->ifp->ifindex); | |
689 | ||
690 | /* Rewrite the md5 signature & update the seq */ | |
691 | ospf_make_md5_digest (oi, op); | |
692 | ||
693 | /* Retrieve OSPF packet type. */ | |
694 | stream_set_getp (op->s, 1); | |
695 | type = stream_getc (op->s); | |
37ccfa3d | 696 | |
2f8f370e DS |
697 | /* reset get pointer */ |
698 | stream_set_getp (op->s, 0); | |
68b7339a | 699 | |
2f8f370e DS |
700 | memset (&iph, 0, sizeof (struct ip)); |
701 | memset (&sa_dst, 0, sizeof (sa_dst)); | |
68b7339a | 702 | |
2f8f370e | 703 | sa_dst.sin_family = AF_INET; |
6f0e3f6e | 704 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
2f8f370e | 705 | sa_dst.sin_len = sizeof(sa_dst); |
6f0e3f6e | 706 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
2f8f370e DS |
707 | sa_dst.sin_addr = op->dst; |
708 | sa_dst.sin_port = htons (0); | |
709 | ||
710 | /* Set DONTROUTE flag if dst is unicast. */ | |
711 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
712 | if (!IN_MULTICAST (htonl (op->dst.s_addr))) | |
713 | flags = MSG_DONTROUTE; | |
714 | ||
715 | iph.ip_hl = sizeof (struct ip) >> OSPF_WRITE_IPHL_SHIFT; | |
716 | /* it'd be very strange for header to not be 4byte-word aligned but.. */ | |
717 | if ( sizeof (struct ip) | |
718 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) ) | |
719 | iph.ip_hl++; /* we presume sizeof struct ip cant overflow ip_hl.. */ | |
68b7339a | 720 | |
2f8f370e DS |
721 | iph.ip_v = IPVERSION; |
722 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; | |
723 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; | |
68b7339a | 724 | |
0150c9c9 | 725 | #if defined(__DragonFly__) |
2f8f370e DS |
726 | /* |
727 | * DragonFly's raw socket expects ip_len/ip_off in network byte order. | |
728 | */ | |
729 | iph.ip_len = htons(iph.ip_len); | |
0150c9c9 DB |
730 | #endif |
731 | ||
0bfeca3f | 732 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
2f8f370e DS |
733 | /* XXX-MT: not thread-safe at all.. |
734 | * XXX: this presumes this is only programme sending OSPF packets | |
735 | * otherwise, no guarantee ipid will be unique | |
736 | */ | |
737 | iph.ip_id = ++ipid; | |
0bfeca3f | 738 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
739 | ||
2f8f370e DS |
740 | iph.ip_off = 0; |
741 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
742 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
743 | else | |
744 | iph.ip_ttl = OSPF_IP_TTL; | |
745 | iph.ip_p = IPPROTO_OSPFIGP; | |
746 | iph.ip_sum = 0; | |
747 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
748 | iph.ip_dst.s_addr = op->dst.s_addr; | |
749 | ||
750 | memset (&msg, 0, sizeof (msg)); | |
751 | msg.msg_name = (caddr_t) &sa_dst; | |
752 | msg.msg_namelen = sizeof (sa_dst); | |
753 | msg.msg_iov = iov; | |
754 | msg.msg_iovlen = 2; | |
755 | iov[0].iov_base = (char*)&iph; | |
756 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; | |
757 | iov[1].iov_base = STREAM_PNT (op->s); | |
758 | iov[1].iov_len = op->length; | |
68b7339a | 759 | |
2f8f370e DS |
760 | /* Sadly we can not rely on kernels to fragment packets because of either |
761 | * IP_HDRINCL and/or multicast destination being set. | |
762 | */ | |
0bfeca3f | 763 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
2f8f370e DS |
764 | if ( op->length > maxdatasize ) |
765 | ospf_write_frags (ospf->fd, op, &iph, &msg, maxdatasize, | |
766 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 767 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 768 | |
2f8f370e DS |
769 | /* send final fragment (could be first) */ |
770 | sockopt_iphdrincl_swab_htosys (&iph); | |
771 | ret = sendmsg (ospf->fd, &msg, flags); | |
772 | sockopt_iphdrincl_swab_systoh (&iph); | |
773 | if (IS_DEBUG_OSPF_EVENT) | |
774 | zlog_debug ("ospf_write to %s, " | |
775 | "id %d, off %d, len %d, interface %s, mtu %u:", | |
776 | inet_ntoa (iph.ip_dst), iph.ip_id, iph.ip_off, iph.ip_len, | |
777 | oi->ifp->name, oi->ifp->mtu); | |
718e3744 | 778 | |
2f8f370e DS |
779 | if (ret < 0) |
780 | zlog_warn ("*** sendmsg in ospf_write failed to %s, " | |
781 | "id %d, off %d, len %d, interface %s, mtu %u: %s", | |
782 | inet_ntoa (iph.ip_dst), iph.ip_id, iph.ip_off, iph.ip_len, | |
783 | oi->ifp->name, oi->ifp->mtu, safe_strerror (errno)); | |
718e3744 | 784 | |
2f8f370e DS |
785 | /* Show debug sending packet. */ |
786 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) | |
787 | { | |
788 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
789 | { | |
790 | zlog_debug ("-----------------------------------------------------"); | |
791 | ospf_ip_header_dump (&iph); | |
792 | stream_set_getp (op->s, 0); | |
793 | ospf_packet_dump (op->s); | |
794 | } | |
718e3744 | 795 | |
2f8f370e DS |
796 | zlog_debug ("%s sent to [%s] via [%s].", |
797 | LOOKUP (ospf_packet_type_str, type), inet_ntoa (op->dst), | |
798 | IF_NAME (oi)); | |
799 | ||
800 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
801 | zlog_debug ("-----------------------------------------------------"); | |
802 | } | |
718e3744 | 803 | |
2f8f370e DS |
804 | /* Now delete packet from queue. */ |
805 | ospf_packet_delete (oi); | |
718e3744 | 806 | |
e8f45e82 DS |
807 | /* Move this interface to the tail of write_q to |
808 | serve everyone in a round robin fashion */ | |
809 | list_delete_node (ospf->oi_write_q, node); | |
810 | if (ospf_fifo_head (oi->obuf) == NULL) | |
811 | { | |
812 | oi->on_write_q = 0; | |
813 | last_serviced_oi = NULL; | |
814 | oi = NULL; | |
815 | } | |
816 | else | |
817 | { | |
818 | listnode_add (ospf->oi_write_q, oi); | |
819 | } | |
820 | ||
821 | /* Setup to service from the head of the queue again */ | |
822 | if (!list_isempty (ospf->oi_write_q)) | |
823 | { | |
824 | node = listhead (ospf->oi_write_q); | |
825 | assert (node); | |
826 | oi = listgetdata (node); | |
827 | assert (oi); | |
828 | } | |
829 | } | |
718e3744 | 830 | |
831 | /* If packets still remain in queue, call write thread. */ | |
68980084 | 832 | if (!list_isempty (ospf->oi_write_q)) |
833 | ospf->t_write = | |
834 | thread_add_write (master, ospf_write, ospf, ospf->fd); | |
718e3744 | 835 | |
836 | return 0; | |
837 | } | |
838 | ||
839 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
4dadc291 | 840 | static void |
718e3744 | 841 | ospf_hello (struct ip *iph, struct ospf_header *ospfh, |
842 | struct stream * s, struct ospf_interface *oi, int size) | |
843 | { | |
844 | struct ospf_hello *hello; | |
845 | struct ospf_neighbor *nbr; | |
718e3744 | 846 | int old_state; |
d3f0d621 | 847 | struct prefix p; |
718e3744 | 848 | |
849 | /* increment statistics. */ | |
850 | oi->hello_in++; | |
851 | ||
852 | hello = (struct ospf_hello *) STREAM_PNT (s); | |
853 | ||
854 | /* If Hello is myself, silently discard. */ | |
68980084 | 855 | if (IPV4_ADDR_SAME (&ospfh->router_id, &oi->ospf->router_id)) |
d324181c | 856 | { |
857 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
858 | { | |
2a42e285 | 859 | zlog_debug ("ospf_header[%s/%s]: selforiginated, " |
d324181c | 860 | "dropping.", |
272ca1e3 | 861 | LOOKUP (ospf_packet_type_str, ospfh->type), |
d324181c | 862 | inet_ntoa (iph->ip_src)); |
863 | } | |
864 | return; | |
865 | } | |
718e3744 | 866 | |
718e3744 | 867 | /* get neighbor prefix. */ |
868 | p.family = AF_INET; | |
869 | p.prefixlen = ip_masklen (hello->network_mask); | |
870 | p.u.prefix4 = iph->ip_src; | |
871 | ||
872 | /* Compare network mask. */ | |
873 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
874 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
875 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
876 | if (oi->address->prefixlen != p.prefixlen) | |
877 | { | |
13cd3dc1 AS |
878 | zlog_warn ("Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).", |
879 | inet_ntoa(ospfh->router_id), IF_NAME(oi), | |
880 | (int)oi->address->prefixlen, (int)p.prefixlen); | |
718e3744 | 881 | return; |
882 | } | |
883 | ||
718e3744 | 884 | /* Compare Router Dead Interval. */ |
885 | if (OSPF_IF_PARAM (oi, v_wait) != ntohl (hello->dead_interval)) | |
886 | { | |
08c83671 AS |
887 | zlog_warn ("Packet %s [Hello:RECV]: RouterDeadInterval mismatch " |
888 | "(expected %u, but received %u).", | |
889 | inet_ntoa(ospfh->router_id), | |
890 | OSPF_IF_PARAM(oi, v_wait), ntohl(hello->dead_interval)); | |
718e3744 | 891 | return; |
892 | } | |
893 | ||
f9ad937f | 894 | /* Compare Hello Interval - ignored if fast-hellos are set. */ |
895 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) | |
896 | { | |
897 | if (OSPF_IF_PARAM (oi, v_hello) != ntohs (hello->hello_interval)) | |
898 | { | |
08c83671 AS |
899 | zlog_warn ("Packet %s [Hello:RECV]: HelloInterval mismatch " |
900 | "(expected %u, but received %u).", | |
901 | inet_ntoa(ospfh->router_id), | |
902 | OSPF_IF_PARAM(oi, v_hello), ntohs(hello->hello_interval)); | |
f9ad937f | 903 | return; |
904 | } | |
905 | } | |
906 | ||
718e3744 | 907 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 908 | zlog_debug ("Packet %s [Hello:RECV]: Options %s", |
718e3744 | 909 | inet_ntoa (ospfh->router_id), |
910 | ospf_options_dump (hello->options)); | |
911 | ||
912 | /* Compare options. */ | |
913 | #define REJECT_IF_TBIT_ON 1 /* XXX */ | |
914 | #ifdef REJECT_IF_TBIT_ON | |
915 | if (CHECK_FLAG (hello->options, OSPF_OPTION_T)) | |
916 | { | |
917 | /* | |
918 | * This router does not support non-zero TOS. | |
919 | * Drop this Hello packet not to establish neighbor relationship. | |
920 | */ | |
921 | zlog_warn ("Packet %s [Hello:RECV]: T-bit on, drop it.", | |
922 | inet_ntoa (ospfh->router_id)); | |
923 | return; | |
924 | } | |
925 | #endif /* REJECT_IF_TBIT_ON */ | |
926 | ||
927 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 928 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
718e3744 | 929 | && CHECK_FLAG (hello->options, OSPF_OPTION_O)) |
930 | { | |
931 | /* | |
932 | * This router does know the correct usage of O-bit | |
933 | * the bit should be set in DD packet only. | |
934 | */ | |
935 | zlog_warn ("Packet %s [Hello:RECV]: O-bit abuse?", | |
936 | inet_ntoa (ospfh->router_id)); | |
937 | #ifdef STRICT_OBIT_USAGE_CHECK | |
938 | return; /* Reject this packet. */ | |
939 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
940 | UNSET_FLAG (hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
941 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
942 | } | |
943 | #endif /* HAVE_OPAQUE_LSA */ | |
944 | ||
945 | /* new for NSSA is to ensure that NP is on and E is off */ | |
946 | ||
718e3744 | 947 | if (oi->area->external_routing == OSPF_AREA_NSSA) |
948 | { | |
949 | if (! (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_NP) | |
950 | && CHECK_FLAG (hello->options, OSPF_OPTION_NP) | |
951 | && ! CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) | |
952 | && ! CHECK_FLAG (hello->options, OSPF_OPTION_E))) | |
953 | { | |
954 | zlog_warn ("NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", inet_ntoa (ospfh->router_id), OPTIONS (oi), hello->options); | |
955 | return; | |
956 | } | |
957 | if (IS_DEBUG_OSPF_NSSA) | |
2a42e285 | 958 | zlog_debug ("NSSA-Hello:RECV:Packet from %s:", inet_ntoa(ospfh->router_id)); |
718e3744 | 959 | } |
960 | else | |
718e3744 | 961 | /* The setting of the E-bit found in the Hello Packet's Options |
962 | field must match this area's ExternalRoutingCapability A | |
963 | mismatch causes processing to stop and the packet to be | |
964 | dropped. The setting of the rest of the bits in the Hello | |
965 | Packet's Options field should be ignored. */ | |
966 | if (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) != | |
967 | CHECK_FLAG (hello->options, OSPF_OPTION_E)) | |
968 | { | |
3aa8d5f9 | 969 | zlog_warn ("Packet %s [Hello:RECV]: my options: %x, his options %x", |
970 | inet_ntoa(ospfh->router_id), OPTIONS (oi), hello->options); | |
718e3744 | 971 | return; |
972 | } | |
718e3744 | 973 | |
d3f0d621 | 974 | /* get neighbour struct */ |
975 | nbr = ospf_nbr_get (oi, ospfh, iph, &p); | |
976 | ||
977 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
978 | assert (nbr); | |
718e3744 | 979 | |
980 | old_state = nbr->state; | |
981 | ||
982 | /* Add event to thread. */ | |
57c5c652 | 983 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); |
718e3744 | 984 | |
985 | /* RFC2328 Section 9.5.1 | |
986 | If the router is not eligible to become Designated Router, | |
987 | (snip) It must also send an Hello Packet in reply to an | |
988 | Hello Packet received from any eligible neighbor (other than | |
989 | the current Designated Router and Backup Designated Router). */ | |
990 | if (oi->type == OSPF_IFTYPE_NBMA) | |
991 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
992 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
993 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
994 | OSPF_NSM_TIMER_ON (nbr->t_hello_reply, ospf_hello_reply_timer, | |
995 | OSPF_HELLO_REPLY_DELAY); | |
996 | ||
997 | /* on NBMA network type, it happens to receive bidirectional Hello packet | |
998 | without advance 1-Way Received event. | |
999 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
1000 | if (oi->type == OSPF_IFTYPE_NBMA && | |
1001 | (old_state == NSM_Down || old_state == NSM_Attempt)) | |
1002 | { | |
57c5c652 | 1003 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_OneWayReceived); |
718e3744 | 1004 | nbr->priority = hello->priority; |
1005 | nbr->d_router = hello->d_router; | |
1006 | nbr->bd_router = hello->bd_router; | |
1007 | return; | |
1008 | } | |
1009 | ||
68980084 | 1010 | if (ospf_nbr_bidirectional (&oi->ospf->router_id, hello->neighbors, |
718e3744 | 1011 | size - OSPF_HELLO_MIN_SIZE)) |
1012 | { | |
57c5c652 | 1013 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_TwoWayReceived); |
718e3744 | 1014 | nbr->options |= hello->options; |
1015 | } | |
1016 | else | |
1017 | { | |
57c5c652 | 1018 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_OneWayReceived); |
718e3744 | 1019 | /* Set neighbor information. */ |
1020 | nbr->priority = hello->priority; | |
1021 | nbr->d_router = hello->d_router; | |
1022 | nbr->bd_router = hello->bd_router; | |
1023 | return; | |
1024 | } | |
1025 | ||
1026 | /* If neighbor itself declares DR and no BDR exists, | |
1027 | cause event BackupSeen */ | |
1028 | if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router)) | |
1029 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
1030 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
1031 | ||
1032 | /* neighbor itself declares BDR. */ | |
1033 | if (oi->state == ISM_Waiting && | |
1034 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router)) | |
1035 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
1036 | ||
1037 | /* had not previously. */ | |
1038 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router) && | |
1039 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->d_router)) || | |
1040 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->d_router) && | |
1041 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->d_router))) | |
1042 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
1043 | ||
1044 | /* had not previously. */ | |
1045 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router) && | |
1046 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->bd_router)) || | |
1047 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->bd_router) && | |
1048 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->bd_router))) | |
1049 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
1050 | ||
1051 | /* Neighbor priority check. */ | |
1052 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
1053 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
1054 | ||
1055 | /* Set neighbor information. */ | |
1056 | nbr->priority = hello->priority; | |
1057 | nbr->d_router = hello->d_router; | |
1058 | nbr->bd_router = hello->bd_router; | |
1059 | } | |
1060 | ||
1061 | /* Save DD flags/options/Seqnum received. */ | |
4dadc291 | 1062 | static void |
718e3744 | 1063 | ospf_db_desc_save_current (struct ospf_neighbor *nbr, |
1064 | struct ospf_db_desc *dd) | |
1065 | { | |
1066 | nbr->last_recv.flags = dd->flags; | |
1067 | nbr->last_recv.options = dd->options; | |
1068 | nbr->last_recv.dd_seqnum = ntohl (dd->dd_seqnum); | |
1069 | } | |
1070 | ||
1071 | /* Process rest of DD packet. */ | |
1072 | static void | |
1073 | ospf_db_desc_proc (struct stream *s, struct ospf_interface *oi, | |
1074 | struct ospf_neighbor *nbr, struct ospf_db_desc *dd, | |
1075 | u_int16_t size) | |
1076 | { | |
1077 | struct ospf_lsa *new, *find; | |
1078 | struct lsa_header *lsah; | |
1079 | ||
9985f83c | 1080 | stream_forward_getp (s, OSPF_DB_DESC_MIN_SIZE); |
718e3744 | 1081 | for (size -= OSPF_DB_DESC_MIN_SIZE; |
1082 | size >= OSPF_LSA_HEADER_SIZE; size -= OSPF_LSA_HEADER_SIZE) | |
1083 | { | |
1084 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
9985f83c | 1085 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 1086 | |
1087 | /* Unknown LS type. */ | |
1088 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
1089 | { | |
bec595ad | 1090 | zlog_warn ("Packet [DD:RECV]: Unknown LS type %d.", lsah->type); |
718e3744 | 1091 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1092 | return; | |
1093 | } | |
1094 | ||
1095 | #ifdef HAVE_OPAQUE_LSA | |
1096 | if (IS_OPAQUE_LSA (lsah->type) | |
1097 | && ! CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1098 | { | |
1099 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1100 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1101 | return; | |
1102 | } | |
1103 | #endif /* HAVE_OPAQUE_LSA */ | |
1104 | ||
1105 | switch (lsah->type) | |
1106 | { | |
1107 | case OSPF_AS_EXTERNAL_LSA: | |
1108 | #ifdef HAVE_OPAQUE_LSA | |
1109 | case OSPF_OPAQUE_AS_LSA: | |
1110 | #endif /* HAVE_OPAQUE_LSA */ | |
718e3744 | 1111 | /* Check for stub area. Reject if AS-External from stub but |
1112 | allow if from NSSA. */ | |
1113 | if (oi->area->external_routing == OSPF_AREA_STUB) | |
718e3744 | 1114 | { |
1115 | zlog_warn ("Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", | |
1116 | lsah->type, inet_ntoa (lsah->id), | |
1117 | (oi->area->external_routing == OSPF_AREA_STUB) ?\ | |
1118 | "STUB" : "NSSA"); | |
1119 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1120 | return; | |
1121 | } | |
1122 | break; | |
1123 | default: | |
1124 | break; | |
1125 | } | |
1126 | ||
1127 | /* Create LS-request object. */ | |
1128 | new = ospf_ls_request_new (lsah); | |
1129 | ||
1130 | /* Lookup received LSA, then add LS request list. */ | |
1131 | find = ospf_lsa_lookup_by_header (oi->area, lsah); | |
f0894cf8 PJ |
1132 | |
1133 | /* ospf_lsa_more_recent is fine with NULL pointers */ | |
1134 | switch (ospf_lsa_more_recent (find, new)) | |
1135 | { | |
1136 | case -1: | |
1137 | /* Neighbour has a more recent LSA, we must request it */ | |
1138 | ospf_ls_request_add (nbr, new); | |
1139 | case 0: | |
1140 | /* If we have a copy of this LSA, it's either less recent | |
1141 | * and we're requesting it from neighbour (the case above), or | |
1142 | * it's as recent and we both have same copy (this case). | |
1143 | * | |
1144 | * In neither of these two cases is there any point in | |
1145 | * describing our copy of the LSA to the neighbour in a | |
1146 | * DB-Summary packet, if we're still intending to do so. | |
1147 | * | |
1148 | * See: draft-ogier-ospf-dbex-opt-00.txt, describing the | |
1149 | * backward compatible optimisation to OSPF DB Exchange / | |
1150 | * DB Description process implemented here. | |
1151 | */ | |
1152 | if (find) | |
1153 | ospf_lsdb_delete (&nbr->db_sum, find); | |
1154 | ospf_lsa_discard (new); | |
1155 | break; | |
1156 | default: | |
1157 | /* We have the more recent copy, nothing specific to do: | |
1158 | * - no need to request neighbours stale copy | |
1159 | * - must leave DB summary list copy alone | |
1160 | */ | |
1161 | if (IS_DEBUG_OSPF_EVENT) | |
1162 | zlog_debug ("Packet [DD:RECV]: LSA received Type %d, " | |
1163 | "ID %s is not recent.", lsah->type, inet_ntoa (lsah->id)); | |
1164 | ospf_lsa_discard (new); | |
1165 | } | |
718e3744 | 1166 | } |
1167 | ||
1168 | /* Master */ | |
1169 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1170 | { | |
1171 | nbr->dd_seqnum++; | |
8dd24ee6 PJ |
1172 | |
1173 | /* Both sides have no More, then we're done with Exchange */ | |
718e3744 | 1174 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) |
1175 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
1176 | else | |
718e3744 | 1177 | ospf_db_desc_send (nbr); |
1178 | } | |
1179 | /* Slave */ | |
1180 | else | |
1181 | { | |
1182 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); | |
1183 | ||
8dd24ee6 PJ |
1184 | /* Send DD packet in reply. |
1185 | * | |
1186 | * Must be done to acknowledge the Master's DD, regardless of | |
1187 | * whether we have more LSAs ourselves to describe. | |
1188 | * | |
1189 | * This function will clear the 'More' bit, if after this DD | |
1190 | * we have no more LSAs to describe to the master.. | |
1191 | */ | |
718e3744 | 1192 | ospf_db_desc_send (nbr); |
8dd24ee6 PJ |
1193 | |
1194 | /* Slave can raise ExchangeDone now, if master is also done */ | |
1195 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) | |
1196 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
718e3744 | 1197 | } |
8dd24ee6 | 1198 | |
718e3744 | 1199 | /* Save received neighbor values from DD. */ |
1200 | ospf_db_desc_save_current (nbr, dd); | |
97dba7b7 DS |
1201 | |
1202 | if (!nbr->t_ls_req) | |
1203 | ospf_ls_req_send (nbr); | |
718e3744 | 1204 | } |
1205 | ||
4dadc291 | 1206 | static int |
718e3744 | 1207 | ospf_db_desc_is_dup (struct ospf_db_desc *dd, struct ospf_neighbor *nbr) |
1208 | { | |
1209 | /* Is DD duplicated? */ | |
1210 | if (dd->options == nbr->last_recv.options && | |
1211 | dd->flags == nbr->last_recv.flags && | |
1212 | dd->dd_seqnum == htonl (nbr->last_recv.dd_seqnum)) | |
1213 | return 1; | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
3aa8d5f9 | 1219 | static void |
718e3744 | 1220 | ospf_db_desc (struct ip *iph, struct ospf_header *ospfh, |
1221 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1222 | { | |
1223 | struct ospf_db_desc *dd; | |
1224 | struct ospf_neighbor *nbr; | |
1225 | ||
1226 | /* Increment statistics. */ | |
1227 | oi->db_desc_in++; | |
1228 | ||
1229 | dd = (struct ospf_db_desc *) STREAM_PNT (s); | |
d363df2c | 1230 | |
d3f0d621 | 1231 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1232 | if (nbr == NULL) |
1233 | { | |
1234 | zlog_warn ("Packet[DD]: Unknown Neighbor %s", | |
1235 | inet_ntoa (ospfh->router_id)); | |
1236 | return; | |
1237 | } | |
1238 | ||
1239 | /* Check MTU. */ | |
ba682537 | 1240 | if ((OSPF_IF_PARAM (oi, mtu_ignore) == 0) && |
1241 | (ntohs (dd->mtu) > oi->ifp->mtu)) | |
718e3744 | 1242 | { |
3aa8d5f9 | 1243 | zlog_warn ("Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", |
1244 | inet_ntoa (nbr->router_id), ntohs (dd->mtu), | |
1245 | IF_NAME (oi), oi->ifp->mtu); | |
718e3744 | 1246 | return; |
1247 | } | |
1248 | ||
d363df2c | 1249 | /* |
1250 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is not | |
1251 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1252 | * Until proper solution is developped, this hack should help. | |
1253 | * | |
1254 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1255 | * options, unfortunately its use in DD options is not specified. Hence some | |
1256 | * implementations follow E-bit semantics and set it in DD options, and some | |
1257 | * treat it as unspecified and hence follow the directive "default for | |
1258 | * options is clear", ie unset. | |
1259 | * | |
1260 | * Reset the flag, as ospfd follows E-bit semantics. | |
1261 | */ | |
1262 | if ( (oi->area->external_routing == OSPF_AREA_NSSA) | |
1263 | && (CHECK_FLAG (nbr->options, OSPF_OPTION_NP)) | |
1264 | && (!CHECK_FLAG (dd->options, OSPF_OPTION_NP)) ) | |
1265 | { | |
1266 | if (IS_DEBUG_OSPF_EVENT) | |
1210fa66 | 1267 | zlog_debug ("Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", |
d363df2c | 1268 | inet_ntoa (nbr->router_id) ); |
1269 | SET_FLAG (dd->options, OSPF_OPTION_NP); | |
1270 | } | |
d363df2c | 1271 | |
718e3744 | 1272 | #ifdef REJECT_IF_TBIT_ON |
1273 | if (CHECK_FLAG (dd->options, OSPF_OPTION_T)) | |
1274 | { | |
1275 | /* | |
1276 | * In Hello protocol, optional capability must have checked | |
1277 | * to prevent this T-bit enabled router be my neighbor. | |
1278 | */ | |
1279 | zlog_warn ("Packet[DD]: Neighbor %s: T-bit on?", inet_ntoa (nbr->router_id)); | |
1280 | return; | |
1281 | } | |
1282 | #endif /* REJECT_IF_TBIT_ON */ | |
1283 | ||
1284 | #ifdef HAVE_OPAQUE_LSA | |
1285 | if (CHECK_FLAG (dd->options, OSPF_OPTION_O) | |
68980084 | 1286 | && !CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1287 | { |
1288 | /* | |
1289 | * This node is not configured to handle O-bit, for now. | |
1290 | * Clear it to ignore unsupported capability proposed by neighbor. | |
1291 | */ | |
1292 | UNSET_FLAG (dd->options, OSPF_OPTION_O); | |
1293 | } | |
1294 | #endif /* HAVE_OPAQUE_LSA */ | |
1295 | ||
57c5c652 PJ |
1296 | /* Add event to thread. */ |
1297 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
1298 | ||
718e3744 | 1299 | /* Process DD packet by neighbor status. */ |
1300 | switch (nbr->state) | |
1301 | { | |
1302 | case NSM_Down: | |
1303 | case NSM_Attempt: | |
1304 | case NSM_TwoWay: | |
bec595ad | 1305 | zlog_warn ("Packet[DD]: Neighbor %s state is %s, packet discarded.", |
3aa8d5f9 | 1306 | inet_ntoa(nbr->router_id), |
718e3744 | 1307 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1308 | break; | |
1309 | case NSM_Init: | |
1310 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived); | |
1311 | /* If the new state is ExStart, the processing of the current | |
1312 | packet should then continue in this new state by falling | |
1313 | through to case ExStart below. */ | |
1314 | if (nbr->state != NSM_ExStart) | |
1315 | break; | |
1316 | case NSM_ExStart: | |
1317 | /* Initial DBD */ | |
1318 | if ((IS_SET_DD_ALL (dd->flags) == OSPF_DD_FLAG_ALL) && | |
1319 | (size == OSPF_DB_DESC_MIN_SIZE)) | |
1320 | { | |
68980084 | 1321 | if (IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) > 0) |
718e3744 | 1322 | { |
1323 | /* We're Slave---obey */ | |
17eaa728 | 1324 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Slave).", |
3aa8d5f9 | 1325 | inet_ntoa(nbr->router_id)); |
718e3744 | 1326 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); |
8dd24ee6 PJ |
1327 | |
1328 | /* Reset I/MS */ | |
1329 | UNSET_FLAG (nbr->dd_flags, (OSPF_DD_FLAG_MS|OSPF_DD_FLAG_I)); | |
718e3744 | 1330 | } |
1331 | else | |
1332 | { | |
1333 | /* We're Master, ignore the initial DBD from Slave */ | |
6d45276f | 1334 | zlog_info ("Packet[DD]: Neighbor %s: Initial DBD from Slave, " |
3aa8d5f9 | 1335 | "ignoring.", inet_ntoa(nbr->router_id)); |
718e3744 | 1336 | break; |
1337 | } | |
1338 | } | |
1339 | /* Ack from the Slave */ | |
1340 | else if (!IS_SET_DD_MS (dd->flags) && !IS_SET_DD_I (dd->flags) && | |
1341 | ntohl (dd->dd_seqnum) == nbr->dd_seqnum && | |
68980084 | 1342 | IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) < 0) |
718e3744 | 1343 | { |
17eaa728 | 1344 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Master).", |
3aa8d5f9 | 1345 | inet_ntoa(nbr->router_id)); |
8dd24ee6 PJ |
1346 | /* Reset I, leaving MS */ |
1347 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_I); | |
718e3744 | 1348 | } |
1349 | else | |
1350 | { | |
3aa8d5f9 | 1351 | zlog_warn ("Packet[DD]: Neighbor %s Negotiation fails.", |
1352 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1353 | break; |
1354 | } | |
1355 | ||
1356 | /* This is where the real Options are saved */ | |
1357 | nbr->options = dd->options; | |
1358 | ||
1359 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 1360 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1361 | { |
1362 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1363 | zlog_debug ("Neighbor[%s] is %sOpaque-capable.", |
718e3744 | 1364 | inet_ntoa (nbr->router_id), |
1365 | CHECK_FLAG (nbr->options, OSPF_OPTION_O) ? "" : "NOT "); | |
1366 | ||
1367 | if (! CHECK_FLAG (nbr->options, OSPF_OPTION_O) | |
1368 | && IPV4_ADDR_SAME (&DR (oi), &nbr->address.u.prefix4)) | |
1369 | { | |
6d45276f | 1370 | zlog_warn ("DR-neighbor[%s] is NOT opaque-capable; " |
1371 | "Opaque-LSAs cannot be reliably advertised " | |
1372 | "in this network.", | |
1373 | inet_ntoa (nbr->router_id)); | |
718e3744 | 1374 | /* This situation is undesirable, but not a real error. */ |
1375 | } | |
1376 | } | |
1377 | #endif /* HAVE_OPAQUE_LSA */ | |
1378 | ||
1379 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_NegotiationDone); | |
1380 | ||
1381 | /* continue processing rest of packet. */ | |
1382 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1383 | break; | |
1384 | case NSM_Exchange: | |
1385 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1386 | { | |
1387 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1388 | /* Master: discard duplicated DD packet. */ | |
6d45276f | 1389 | zlog_info ("Packet[DD] (Master): Neighbor %s packet duplicated.", |
3aa8d5f9 | 1390 | inet_ntoa (nbr->router_id)); |
718e3744 | 1391 | else |
1392 | /* Slave: cause to retransmit the last Database Description. */ | |
1393 | { | |
6d45276f | 1394 | zlog_info ("Packet[DD] [Slave]: Neighbor %s packet duplicated.", |
3aa8d5f9 | 1395 | inet_ntoa (nbr->router_id)); |
718e3744 | 1396 | ospf_db_desc_resend (nbr); |
1397 | } | |
1398 | break; | |
1399 | } | |
1400 | ||
1401 | /* Otherwise DD packet should be checked. */ | |
1402 | /* Check Master/Slave bit mismatch */ | |
1403 | if (IS_SET_DD_MS (dd->flags) != IS_SET_DD_MS (nbr->last_recv.flags)) | |
1404 | { | |
3aa8d5f9 | 1405 | zlog_warn ("Packet[DD]: Neighbor %s MS-bit mismatch.", |
1406 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1407 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1408 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1409 | zlog_debug ("Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", |
3aa8d5f9 | 1410 | dd->flags, nbr->dd_flags); |
718e3744 | 1411 | break; |
1412 | } | |
1413 | ||
1414 | /* Check initialize bit is set. */ | |
1415 | if (IS_SET_DD_I (dd->flags)) | |
1416 | { | |
6d45276f | 1417 | zlog_info ("Packet[DD]: Neighbor %s I-bit set.", |
3aa8d5f9 | 1418 | inet_ntoa(nbr->router_id)); |
718e3744 | 1419 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1420 | break; | |
1421 | } | |
1422 | ||
1423 | /* Check DD Options. */ | |
1424 | if (dd->options != nbr->options) | |
1425 | { | |
1426 | #ifdef ORIGINAL_CODING | |
1427 | /* Save the new options for debugging */ | |
1428 | nbr->options = dd->options; | |
1429 | #endif /* ORIGINAL_CODING */ | |
3aa8d5f9 | 1430 | zlog_warn ("Packet[DD]: Neighbor %s options mismatch.", |
1431 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1432 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1433 | break; | |
1434 | } | |
1435 | ||
1436 | /* Check DD sequence number. */ | |
1437 | if ((IS_SET_DD_MS (nbr->dd_flags) && | |
1438 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum) || | |
1439 | (!IS_SET_DD_MS (nbr->dd_flags) && | |
1440 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum + 1)) | |
1441 | { | |
3aa8d5f9 | 1442 | zlog_warn ("Packet[DD]: Neighbor %s sequence number mismatch.", |
1443 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1444 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1445 | break; | |
1446 | } | |
1447 | ||
1448 | /* Continue processing rest of packet. */ | |
1449 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1450 | break; | |
1451 | case NSM_Loading: | |
1452 | case NSM_Full: | |
1453 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1454 | { | |
1455 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1456 | { | |
1457 | /* Master should discard duplicate DD packet. */ | |
6d45276f | 1458 | zlog_info ("Packet[DD]: Neighbor %s duplicated, " |
1459 | "packet discarded.", | |
3aa8d5f9 | 1460 | inet_ntoa(nbr->router_id)); |
718e3744 | 1461 | break; |
1462 | } | |
1463 | else | |
1464 | { | |
1465 | struct timeval t, now; | |
2518efd1 | 1466 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &now); |
718e3744 | 1467 | t = tv_sub (now, nbr->last_send_ts); |
1468 | if (tv_cmp (t, int2tv (nbr->v_inactivity)) < 0) | |
1469 | { | |
1470 | /* In states Loading and Full the slave must resend | |
1471 | its last Database Description packet in response to | |
1472 | duplicate Database Description packets received | |
1473 | from the master. For this reason the slave must | |
1474 | wait RouterDeadInterval seconds before freeing the | |
1475 | last Database Description packet. Reception of a | |
1476 | Database Description packet from the master after | |
1477 | this interval will generate a SeqNumberMismatch | |
1478 | neighbor event. RFC2328 Section 10.8 */ | |
1479 | ospf_db_desc_resend (nbr); | |
1480 | break; | |
1481 | } | |
1482 | } | |
1483 | } | |
1484 | ||
1485 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1486 | break; | |
1487 | default: | |
3aa8d5f9 | 1488 | zlog_warn ("Packet[DD]: Neighbor %s NSM illegal status %u.", |
1489 | inet_ntoa(nbr->router_id), nbr->state); | |
718e3744 | 1490 | break; |
1491 | } | |
1492 | } | |
1493 | ||
1494 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1495 | ||
1496 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
4dadc291 | 1497 | static void |
718e3744 | 1498 | ospf_ls_req (struct ip *iph, struct ospf_header *ospfh, |
1499 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1500 | { | |
1501 | struct ospf_neighbor *nbr; | |
1502 | u_int32_t ls_type; | |
1503 | struct in_addr ls_id; | |
1504 | struct in_addr adv_router; | |
1505 | struct ospf_lsa *find; | |
52dc7ee6 | 1506 | struct list *ls_upd; |
6c835671 | 1507 | unsigned int length; |
718e3744 | 1508 | |
1509 | /* Increment statistics. */ | |
1510 | oi->ls_req_in++; | |
1511 | ||
d3f0d621 | 1512 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1513 | if (nbr == NULL) |
1514 | { | |
1515 | zlog_warn ("Link State Request: Unknown Neighbor %s.", | |
1516 | inet_ntoa (ospfh->router_id)); | |
1517 | return; | |
1518 | } | |
1519 | ||
57c5c652 PJ |
1520 | /* Add event to thread. */ |
1521 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
1522 | ||
718e3744 | 1523 | /* Neighbor State should be Exchange or later. */ |
1524 | if (nbr->state != NSM_Exchange && | |
1525 | nbr->state != NSM_Loading && | |
1526 | nbr->state != NSM_Full) | |
1527 | { | |
bec595ad | 1528 | zlog_warn ("Link State Request received from %s: " |
1529 | "Neighbor state is %s, packet discarded.", | |
1530 | inet_ntoa (ospfh->router_id), | |
718e3744 | 1531 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1532 | return; | |
1533 | } | |
1534 | ||
1535 | /* Send Link State Update for ALL requested LSAs. */ | |
1536 | ls_upd = list_new (); | |
1537 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1538 | ||
1539 | while (size >= OSPF_LSA_KEY_SIZE) | |
1540 | { | |
1541 | /* Get one slice of Link State Request. */ | |
1542 | ls_type = stream_getl (s); | |
1543 | ls_id.s_addr = stream_get_ipv4 (s); | |
1544 | adv_router.s_addr = stream_get_ipv4 (s); | |
1545 | ||
1546 | /* Verify LSA type. */ | |
1547 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) | |
1548 | { | |
1549 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1550 | list_delete (ls_upd); | |
1551 | return; | |
1552 | } | |
1553 | ||
1554 | /* Search proper LSA in LSDB. */ | |
1555 | find = ospf_lsa_lookup (oi->area, ls_type, ls_id, adv_router); | |
1556 | if (find == NULL) | |
1557 | { | |
1558 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1559 | list_delete (ls_upd); | |
1560 | return; | |
1561 | } | |
1562 | ||
86f1fd96 | 1563 | /* Packet overflows MTU size, send immediately. */ |
1564 | if (length + ntohs (find->data->length) > ospf_packet_max (oi)) | |
718e3744 | 1565 | { |
1566 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1567 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1568 | else | |
1569 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1570 | ||
1571 | /* Only remove list contents. Keep ls_upd. */ | |
1572 | list_delete_all_node (ls_upd); | |
1573 | ||
1574 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1575 | } | |
1576 | ||
1577 | /* Append LSA to update list. */ | |
1578 | listnode_add (ls_upd, find); | |
1579 | length += ntohs (find->data->length); | |
1580 | ||
1581 | size -= OSPF_LSA_KEY_SIZE; | |
1582 | } | |
1583 | ||
1584 | /* Send rest of Link State Update. */ | |
1585 | if (listcount (ls_upd) > 0) | |
1586 | { | |
1587 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1588 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1589 | else | |
1590 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1591 | ||
1592 | list_delete (ls_upd); | |
1593 | } | |
1594 | else | |
1595 | list_free (ls_upd); | |
1596 | } | |
1597 | ||
1598 | /* Get the list of LSAs from Link State Update packet. | |
1599 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
52dc7ee6 | 1600 | static struct list * |
718e3744 | 1601 | ospf_ls_upd_list_lsa (struct ospf_neighbor *nbr, struct stream *s, |
1602 | struct ospf_interface *oi, size_t size) | |
1603 | { | |
1604 | u_int16_t count, sum; | |
1605 | u_int32_t length; | |
1606 | struct lsa_header *lsah; | |
1607 | struct ospf_lsa *lsa; | |
52dc7ee6 | 1608 | struct list *lsas; |
718e3744 | 1609 | |
1610 | lsas = list_new (); | |
1611 | ||
1612 | count = stream_getl (s); | |
1613 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1614 | ||
1615 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
9985f83c | 1616 | size -= length, stream_forward_getp (s, length), count--) |
718e3744 | 1617 | { |
1618 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
1619 | length = ntohs (lsah->length); | |
1620 | ||
1621 | if (length > size) | |
1622 | { | |
1623 | zlog_warn ("Link State Update: LSA length exceeds packet size."); | |
1624 | break; | |
1625 | } | |
1626 | ||
1627 | /* Validate the LSA's LS checksum. */ | |
1628 | sum = lsah->checksum; | |
d8a4e42b | 1629 | if (! ospf_lsa_checksum_valid (lsah)) |
718e3744 | 1630 | { |
223da1a9 JF |
1631 | /* (bug #685) more details in a one-line message make it possible |
1632 | * to identify problem source on the one hand and to have a better | |
1633 | * chance to compress repeated messages in syslog on the other */ | |
1634 | zlog_warn ("Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s", | |
1635 | sum, lsah->checksum, inet_ntoa (lsah->id), | |
1636 | inet_ntoa (nbr->src), inet_ntoa (nbr->router_id), | |
1637 | inet_ntoa (lsah->adv_router)); | |
718e3744 | 1638 | continue; |
1639 | } | |
1640 | ||
1641 | /* Examine the LSA's LS type. */ | |
1642 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
1643 | { | |
1644 | zlog_warn ("Link State Update: Unknown LS type %d", lsah->type); | |
1645 | continue; | |
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * What if the received LSA's age is greater than MaxAge? | |
1650 | * Treat it as a MaxAge case -- endo. | |
1651 | */ | |
1652 | if (ntohs (lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1653 | lsah->ls_age = htons (OSPF_LSA_MAXAGE); | |
1654 | ||
1655 | #ifdef HAVE_OPAQUE_LSA | |
1656 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1657 | { | |
1658 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1659 | if ((IS_OPAQUE_LSA(lsah->type) && | |
1660 | ! CHECK_FLAG (lsah->options, OSPF_OPTION_O)) | |
1661 | || (! IS_OPAQUE_LSA(lsah->type) && | |
1662 | CHECK_FLAG (lsah->options, OSPF_OPTION_O))) | |
1663 | { | |
1664 | /* | |
1665 | * This neighbor must know the exact usage of O-bit; | |
1666 | * the bit will be set in Type-9,10,11 LSAs only. | |
1667 | */ | |
1668 | zlog_warn ("LSA[Type%d:%s]: O-bit abuse?", lsah->type, inet_ntoa (lsah->id)); | |
1669 | continue; | |
1670 | } | |
1671 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
1672 | ||
1673 | /* Do not take in AS External Opaque-LSAs if we are a stub. */ | |
1674 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1675 | && nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1676 | { | |
1677 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1678 | zlog_debug ("LSA[Type%d:%s]: We are a stub, don't take this LSA.", lsah->type, inet_ntoa (lsah->id)); |
718e3744 | 1679 | continue; |
1680 | } | |
1681 | } | |
1682 | else if (IS_OPAQUE_LSA(lsah->type)) | |
1683 | { | |
1684 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1685 | continue; | |
1686 | } | |
1687 | #endif /* HAVE_OPAQUE_LSA */ | |
1688 | ||
1689 | /* Create OSPF LSA instance. */ | |
1690 | lsa = ospf_lsa_new (); | |
1691 | ||
1692 | /* We may wish to put some error checking if type NSSA comes in | |
1693 | and area not in NSSA mode */ | |
1694 | switch (lsah->type) | |
1695 | { | |
1696 | case OSPF_AS_EXTERNAL_LSA: | |
1697 | #ifdef HAVE_OPAQUE_LSA | |
1698 | case OSPF_OPAQUE_AS_LSA: | |
58952492 | 1699 | #endif /* HAVE_OPAQUE_LSA */ |
718e3744 | 1700 | lsa->area = NULL; |
1701 | break; | |
58952492 | 1702 | #ifdef HAVE_OPAQUE_LSA |
718e3744 | 1703 | case OSPF_OPAQUE_LINK_LSA: |
1704 | lsa->oi = oi; /* Remember incoming interface for flooding control. */ | |
1705 | /* Fallthrough */ | |
1706 | #endif /* HAVE_OPAQUE_LSA */ | |
1707 | default: | |
1708 | lsa->area = oi->area; | |
1709 | break; | |
1710 | } | |
1711 | ||
1712 | lsa->data = ospf_lsa_data_new (length); | |
1713 | memcpy (lsa->data, lsah, length); | |
1714 | ||
1715 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1716 | zlog_debug("LSA[Type%d:%s]: %p new LSA created with Link State Update", |
718e3744 | 1717 | lsa->data->type, inet_ntoa (lsa->data->id), lsa); |
1718 | listnode_add (lsas, lsa); | |
1719 | } | |
1720 | ||
1721 | return lsas; | |
1722 | } | |
1723 | ||
1724 | /* Cleanup Update list. */ | |
4dadc291 | 1725 | static void |
52dc7ee6 | 1726 | ospf_upd_list_clean (struct list *lsas) |
718e3744 | 1727 | { |
1eb8ef25 | 1728 | struct listnode *node, *nnode; |
718e3744 | 1729 | struct ospf_lsa *lsa; |
1730 | ||
1eb8ef25 | 1731 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
1732 | ospf_lsa_discard (lsa); | |
718e3744 | 1733 | |
1734 | list_delete (lsas); | |
1735 | } | |
1736 | ||
1737 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
4dadc291 | 1738 | static void |
ac7424f9 | 1739 | ospf_ls_upd (struct ospf *ospf, struct ip *iph, struct ospf_header *ospfh, |
718e3744 | 1740 | struct stream *s, struct ospf_interface *oi, u_int16_t size) |
1741 | { | |
1742 | struct ospf_neighbor *nbr; | |
52dc7ee6 | 1743 | struct list *lsas; |
1eb8ef25 | 1744 | struct listnode *node, *nnode; |
718e3744 | 1745 | struct ospf_lsa *lsa = NULL; |
1746 | /* unsigned long ls_req_found = 0; */ | |
1747 | ||
1748 | /* Dis-assemble the stream, update each entry, re-encapsulate for flooding */ | |
1749 | ||
1750 | /* Increment statistics. */ | |
1751 | oi->ls_upd_in++; | |
1752 | ||
1753 | /* Check neighbor. */ | |
d3f0d621 | 1754 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1755 | if (nbr == NULL) |
1756 | { | |
1757 | zlog_warn ("Link State Update: Unknown Neighbor %s on int: %s", | |
1758 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); | |
1759 | return; | |
1760 | } | |
1761 | ||
57c5c652 PJ |
1762 | /* Add event to thread. */ |
1763 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
1764 | ||
718e3744 | 1765 | /* Check neighbor state. */ |
1766 | if (nbr->state < NSM_Exchange) | |
1767 | { | |
3aa8d5f9 | 1768 | zlog_warn ("Link State Update: " |
1769 | "Neighbor[%s] state %s is less than Exchange", | |
1770 | inet_ntoa (ospfh->router_id), | |
1771 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 1772 | return; |
1773 | } | |
1774 | ||
1775 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages | |
1776 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1777 | * of section 13. | |
1778 | */ | |
1779 | lsas = ospf_ls_upd_list_lsa (nbr, s, oi, size); | |
1780 | ||
1781 | #ifdef HAVE_OPAQUE_LSA | |
718e3744 | 1782 | /* |
1783 | * If self-originated Opaque-LSAs that have flooded before restart | |
1784 | * are contained in the received LSUpd message, corresponding LSReq | |
1785 | * messages to be sent may have to be modified. | |
1786 | * To eliminate possible race conditions such that flushing and normal | |
1787 | * updating for the same LSA would take place alternately, this trick | |
1788 | * must be done before entering to the loop below. | |
1789 | */ | |
69310a67 | 1790 | /* XXX: Why is this Opaque specific? Either our core code is deficient |
1791 | * and this should be fixed generally, or Opaque is inventing strawman | |
1792 | * problems */ | |
718e3744 | 1793 | ospf_opaque_adjust_lsreq (nbr, lsas); |
1794 | #endif /* HAVE_OPAQUE_LSA */ | |
1795 | ||
1796 | #define DISCARD_LSA(L,N) {\ | |
1797 | if (IS_DEBUG_OSPF_EVENT) \ | |
2a42e285 | 1798 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p Type-%d", N, lsa, (int) lsa->data->type); \ |
718e3744 | 1799 | ospf_lsa_discard (L); \ |
1800 | continue; } | |
1801 | ||
f92c57f8 AC |
1802 | /* Process each LSA received in the one packet. |
1803 | * | |
1804 | * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding | |
0798cee3 | 1805 | * text below are from the steps in RFC 2328, Section 13. |
f92c57f8 | 1806 | */ |
1eb8ef25 | 1807 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
718e3744 | 1808 | { |
1809 | struct ospf_lsa *ls_ret, *current; | |
1810 | int ret = 1; | |
1811 | ||
718e3744 | 1812 | if (IS_DEBUG_OSPF_NSSA) |
1813 | { | |
1814 | char buf1[INET_ADDRSTRLEN]; | |
1815 | char buf2[INET_ADDRSTRLEN]; | |
1816 | char buf3[INET_ADDRSTRLEN]; | |
1817 | ||
2a42e285 | 1818 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", |
718e3744 | 1819 | lsa->data->type, |
1820 | inet_ntop (AF_INET, &ospfh->router_id, | |
1821 | buf1, INET_ADDRSTRLEN), | |
1822 | inet_ntop (AF_INET, &lsa->data->id, | |
1823 | buf2, INET_ADDRSTRLEN), | |
1824 | inet_ntop (AF_INET, &lsa->data->adv_router, | |
1825 | buf3, INET_ADDRSTRLEN)); | |
1826 | } | |
718e3744 | 1827 | |
1828 | listnode_delete (lsas, lsa); /* We don't need it in list anymore */ | |
1829 | ||
f92c57f8 | 1830 | /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa() */ |
718e3744 | 1831 | |
f92c57f8 | 1832 | /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */ |
718e3744 | 1833 | |
f92c57f8 | 1834 | /* (3) Do not take in AS External LSAs if we are a stub or NSSA. */ |
718e3744 | 1835 | |
1836 | /* Do not take in AS NSSA if this neighbor and we are not NSSA */ | |
1837 | ||
1838 | /* Do take in Type-7's if we are an NSSA */ | |
1839 | ||
1840 | /* If we are also an ABR, later translate them to a Type-5 packet */ | |
1841 | ||
1842 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1843 | translate them to a separate Type-5 packet. */ | |
1844 | ||
1845 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1846 | /* Reject from STUB or NSSA */ | |
1847 | if (nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1848 | { | |
718e3744 | 1849 | if (IS_DEBUG_OSPF_NSSA) |
2a42e285 | 1850 | zlog_debug("Incoming External LSA Discarded: We are NSSA/STUB Area"); |
2cd754de | 1851 | DISCARD_LSA (lsa, 1); |
718e3744 | 1852 | } |
1853 | ||
718e3744 | 1854 | if (lsa->data->type == OSPF_AS_NSSA_LSA) |
1855 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) | |
1856 | { | |
718e3744 | 1857 | if (IS_DEBUG_OSPF_NSSA) |
2a42e285 | 1858 | zlog_debug("Incoming NSSA LSA Discarded: Not NSSA Area"); |
2cd754de | 1859 | DISCARD_LSA (lsa,2); |
718e3744 | 1860 | } |
718e3744 | 1861 | |
23cd8fb7 DL |
1862 | /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */ |
1863 | if (lsa->data->type == OSPF_ROUTER_LSA) | |
1864 | if (!IPV4_ADDR_SAME(&lsa->data->id, &lsa->data->adv_router)) | |
1865 | { | |
1866 | char buf1[INET_ADDRSTRLEN]; | |
1867 | char buf2[INET_ADDRSTRLEN]; | |
1868 | char buf3[INET_ADDRSTRLEN]; | |
1869 | ||
1870 | zlog_err("Incoming Router-LSA from %s with " | |
1871 | "Adv-ID[%s] != LS-ID[%s]", | |
1872 | inet_ntop (AF_INET, &ospfh->router_id, | |
1873 | buf1, INET_ADDRSTRLEN), | |
1874 | inet_ntop (AF_INET, &lsa->data->id, | |
1875 | buf2, INET_ADDRSTRLEN), | |
1876 | inet_ntop (AF_INET, &lsa->data->adv_router, | |
1877 | buf3, INET_ADDRSTRLEN)); | |
1878 | zlog_err("OSPF domain compromised by attack or corruption. " | |
1879 | "Verify correct operation of -ALL- OSPF routers."); | |
1880 | DISCARD_LSA (lsa, 0); | |
1881 | } | |
1882 | ||
718e3744 | 1883 | /* Find the LSA in the current database. */ |
1884 | ||
1885 | current = ospf_lsa_lookup_by_header (oi->area, lsa->data); | |
1886 | ||
f92c57f8 | 1887 | /* (4) If the LSA's LS age is equal to MaxAge, and there is currently |
718e3744 | 1888 | no instance of the LSA in the router's link state database, |
1889 | and none of router's neighbors are in states Exchange or Loading, | |
f92c57f8 | 1890 | then take the following actions: */ |
718e3744 | 1891 | |
1892 | if (IS_LSA_MAXAGE (lsa) && !current && | |
4c14b7f6 | 1893 | ospf_check_nbr_status(oi->ospf)) |
718e3744 | 1894 | { |
f92c57f8 | 1895 | /* (4a) Response Link State Acknowledgment. */ |
718e3744 | 1896 | ospf_ls_ack_send (nbr, lsa); |
1897 | ||
f92c57f8 | 1898 | /* (4b) Discard LSA. */ |
faf98758 AB |
1899 | if (IS_DEBUG_OSPF (lsa, LSA)) |
1900 | { | |
1901 | zlog_debug ("Link State Update[%s]: LS age is equal to MaxAge.", | |
1902 | dump_lsa_key(lsa)); | |
1903 | } | |
718e3744 | 1904 | DISCARD_LSA (lsa, 3); |
1905 | } | |
1906 | ||
1907 | #ifdef HAVE_OPAQUE_LSA | |
1908 | if (IS_OPAQUE_LSA (lsa->data->type) | |
68980084 | 1909 | && IPV4_ADDR_SAME (&lsa->data->adv_router, &oi->ospf->router_id)) |
718e3744 | 1910 | { |
1911 | /* | |
1912 | * Even if initial flushing seems to be completed, there might | |
1913 | * be a case that self-originated LSA with MaxAge still remain | |
1914 | * in the routing domain. | |
1915 | * Just send an LSAck message to cease retransmission. | |
1916 | */ | |
1917 | if (IS_LSA_MAXAGE (lsa)) | |
1918 | { | |
1919 | zlog_warn ("LSA[%s]: Boomerang effect?", dump_lsa_key (lsa)); | |
1920 | ospf_ls_ack_send (nbr, lsa); | |
1921 | ospf_lsa_discard (lsa); | |
1922 | ||
1923 | if (current != NULL && ! IS_LSA_MAXAGE (current)) | |
1924 | ospf_opaque_lsa_refresh_schedule (current); | |
1925 | continue; | |
1926 | } | |
1927 | ||
1928 | /* | |
1929 | * If an instance of self-originated Opaque-LSA is not found | |
1930 | * in the LSDB, there are some possible cases here. | |
1931 | * | |
1932 | * 1) This node lost opaque-capability after restart. | |
1933 | * 2) Else, a part of opaque-type is no more supported. | |
1934 | * 3) Else, a part of opaque-id is no more supported. | |
1935 | * | |
1936 | * Anyway, it is still this node's responsibility to flush it. | |
1937 | * Otherwise, the LSA instance remains in the routing domain | |
1938 | * until its age reaches to MaxAge. | |
1939 | */ | |
69310a67 | 1940 | /* XXX: We should deal with this for *ALL* LSAs, not just opaque */ |
718e3744 | 1941 | if (current == NULL) |
1942 | { | |
1943 | if (IS_DEBUG_OSPF_EVENT) | |
69310a67 | 1944 | zlog_debug ("LSA[%s]: Previously originated Opaque-LSA," |
1945 | "not found in the LSDB.", dump_lsa_key (lsa)); | |
718e3744 | 1946 | |
1947 | SET_FLAG (lsa->flags, OSPF_LSA_SELF); | |
69310a67 | 1948 | |
1949 | ospf_opaque_self_originated_lsa_received (nbr, lsa); | |
1950 | ospf_ls_ack_send (nbr, lsa); | |
1951 | ||
718e3744 | 1952 | continue; |
1953 | } | |
1954 | } | |
1955 | #endif /* HAVE_OPAQUE_LSA */ | |
69310a67 | 1956 | |
cb05eb28 | 1957 | /* It might be happen that received LSA is self-originated network LSA, but |
f92c57f8 | 1958 | * router ID is changed. So, we should check if LSA is a network-LSA whose |
cb05eb28 | 1959 | * Link State ID is one of the router's own IP interface addresses but whose |
1960 | * Advertising Router is not equal to the router's own Router ID | |
1961 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be flushed. | |
1962 | */ | |
1963 | ||
1964 | if(lsa->data->type == OSPF_NETWORK_LSA) | |
1965 | { | |
1eb8ef25 | 1966 | struct listnode *oinode, *oinnode; |
1967 | struct ospf_interface *out_if; | |
cb05eb28 | 1968 | int Flag = 0; |
1969 | ||
1eb8ef25 | 1970 | for (ALL_LIST_ELEMENTS (oi->ospf->oiflist, oinode, oinnode, out_if)) |
cb05eb28 | 1971 | { |
cb05eb28 | 1972 | if(out_if == NULL) |
1973 | break; | |
1974 | ||
1975 | if((IPV4_ADDR_SAME(&out_if->address->u.prefix4, &lsa->data->id)) && | |
1976 | (!(IPV4_ADDR_SAME(&oi->ospf->router_id, &lsa->data->adv_router)))) | |
1977 | { | |
1978 | if(out_if->network_lsa_self) | |
1979 | { | |
1980 | ospf_lsa_flush_area(lsa,out_if->area); | |
1981 | if(IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1982 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", |
cb05eb28 | 1983 | lsa, (int) lsa->data->type); |
1984 | ospf_lsa_discard (lsa); | |
1985 | Flag = 1; | |
1986 | } | |
1987 | break; | |
1988 | } | |
1989 | } | |
1990 | if(Flag) | |
1991 | continue; | |
1992 | } | |
718e3744 | 1993 | |
1994 | /* (5) Find the instance of this LSA that is currently contained | |
1995 | in the router's link state database. If there is no | |
1996 | database copy, or the received LSA is more recent than | |
f92c57f8 AC |
1997 | the database copy the following steps must be performed. |
1998 | (The sub steps from RFC 2328 section 13 step (5) will be performed in | |
1999 | ospf_flood() ) */ | |
718e3744 | 2000 | |
2001 | if (current == NULL || | |
2002 | (ret = ospf_lsa_more_recent (current, lsa)) < 0) | |
2003 | { | |
2004 | /* Actual flooding procedure. */ | |
68980084 | 2005 | if (ospf_flood (oi->ospf, nbr, current, lsa) < 0) /* Trap NSSA later. */ |
718e3744 | 2006 | DISCARD_LSA (lsa, 4); |
2007 | continue; | |
2008 | } | |
2009 | ||
2010 | /* (6) Else, If there is an instance of the LSA on the sending | |
2011 | neighbor's Link state request list, an error has occurred in | |
2012 | the Database Exchange process. In this case, restart the | |
2013 | Database Exchange process by generating the neighbor event | |
2014 | BadLSReq for the sending neighbor and stop processing the | |
2015 | Link State Update packet. */ | |
2016 | ||
2017 | if (ospf_ls_request_lookup (nbr, lsa)) | |
2018 | { | |
2019 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
3aa8d5f9 | 2020 | zlog_warn("LSA[%s] instance exists on Link state request list", |
2021 | dump_lsa_key(lsa)); | |
718e3744 | 2022 | |
2023 | /* Clean list of LSAs. */ | |
2024 | ospf_upd_list_clean (lsas); | |
2025 | /* this lsa is not on lsas list already. */ | |
2026 | ospf_lsa_discard (lsa); | |
718e3744 | 2027 | return; |
2028 | } | |
2029 | ||
2030 | /* If the received LSA is the same instance as the database copy | |
2031 | (i.e., neither one is more recent) the following two steps | |
2032 | should be performed: */ | |
2033 | ||
2034 | if (ret == 0) | |
2035 | { | |
2036 | /* If the LSA is listed in the Link state retransmission list | |
2037 | for the receiving adjacency, the router itself is expecting | |
2038 | an acknowledgment for this LSA. The router should treat the | |
2039 | received LSA as an acknowledgment by removing the LSA from | |
2040 | the Link state retransmission list. This is termed an | |
2041 | "implied acknowledgment". */ | |
2042 | ||
2043 | ls_ret = ospf_ls_retransmit_lookup (nbr, lsa); | |
2044 | ||
2045 | if (ls_ret != NULL) | |
2046 | { | |
2047 | ospf_ls_retransmit_delete (nbr, ls_ret); | |
2048 | ||
2049 | /* Delayed acknowledgment sent if advertisement received | |
2050 | from Designated Router, otherwise do nothing. */ | |
2051 | if (oi->state == ISM_Backup) | |
2052 | if (NBR_IS_DR (nbr)) | |
2053 | listnode_add (oi->ls_ack, ospf_lsa_lock (lsa)); | |
2054 | ||
2055 | DISCARD_LSA (lsa, 5); | |
2056 | } | |
2057 | else | |
2058 | /* Acknowledge the receipt of the LSA by sending a | |
2059 | Link State Acknowledgment packet back out the receiving | |
2060 | interface. */ | |
2061 | { | |
2062 | ospf_ls_ack_send (nbr, lsa); | |
2063 | DISCARD_LSA (lsa, 6); | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | /* The database copy is more recent. If the database copy | |
2068 | has LS age equal to MaxAge and LS sequence number equal to | |
2069 | MaxSequenceNumber, simply discard the received LSA without | |
2070 | acknowledging it. (In this case, the LSA's LS sequence number is | |
2071 | wrapping, and the MaxSequenceNumber LSA must be completely | |
2072 | flushed before any new LSA instance can be introduced). */ | |
2073 | ||
2074 | else if (ret > 0) /* Database copy is more recent */ | |
2075 | { | |
2076 | if (IS_LSA_MAXAGE (current) && | |
2077 | current->data->ls_seqnum == htonl (OSPF_MAX_SEQUENCE_NUMBER)) | |
2078 | { | |
2079 | DISCARD_LSA (lsa, 7); | |
2080 | } | |
2081 | /* Otherwise, as long as the database copy has not been sent in a | |
2082 | Link State Update within the last MinLSArrival seconds, send the | |
2083 | database copy back to the sending neighbor, encapsulated within | |
2084 | a Link State Update Packet. The Link State Update Packet should | |
2085 | be sent directly to the neighbor. In so doing, do not put the | |
2086 | database copy of the LSA on the neighbor's link state | |
2087 | retransmission list, and do not acknowledge the received (less | |
2088 | recent) LSA instance. */ | |
2089 | else | |
2090 | { | |
2091 | struct timeval now; | |
2092 | ||
2518efd1 | 2093 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &now); |
718e3744 | 2094 | |
2095 | if (tv_cmp (tv_sub (now, current->tv_orig), | |
ac7424f9 | 2096 | intms2tv (oi->ospf->min_ls_arrival)) >= 0) |
718e3744 | 2097 | /* Trap NSSA type later.*/ |
2098 | ospf_ls_upd_send_lsa (nbr, current, OSPF_SEND_PACKET_DIRECT); | |
2099 | DISCARD_LSA (lsa, 8); | |
2100 | } | |
2101 | } | |
2102 | } | |
2cd754de PJ |
2103 | #undef DISCARD_LSA |
2104 | ||
718e3744 | 2105 | assert (listcount (lsas) == 0); |
2106 | list_delete (lsas); | |
2107 | } | |
2108 | ||
2109 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
4dadc291 | 2110 | static void |
718e3744 | 2111 | ospf_ls_ack (struct ip *iph, struct ospf_header *ospfh, |
2112 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
2113 | { | |
2114 | struct ospf_neighbor *nbr; | |
69310a67 | 2115 | |
718e3744 | 2116 | /* increment statistics. */ |
2117 | oi->ls_ack_in++; | |
2118 | ||
d3f0d621 | 2119 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 2120 | if (nbr == NULL) |
2121 | { | |
2122 | zlog_warn ("Link State Acknowledgment: Unknown Neighbor %s.", | |
2123 | inet_ntoa (ospfh->router_id)); | |
2124 | return; | |
2125 | } | |
2126 | ||
57c5c652 PJ |
2127 | /* Add event to thread. */ |
2128 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived); | |
2129 | ||
718e3744 | 2130 | if (nbr->state < NSM_Exchange) |
2131 | { | |
3aa8d5f9 | 2132 | zlog_warn ("Link State Acknowledgment: " |
2133 | "Neighbor[%s] state %s is less than Exchange", | |
2134 | inet_ntoa (ospfh->router_id), | |
2135 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 2136 | return; |
2137 | } | |
69310a67 | 2138 | |
718e3744 | 2139 | while (size >= OSPF_LSA_HEADER_SIZE) |
2140 | { | |
2141 | struct ospf_lsa *lsa, *lsr; | |
2142 | ||
2143 | lsa = ospf_lsa_new (); | |
2144 | lsa->data = (struct lsa_header *) STREAM_PNT (s); | |
2145 | ||
2146 | /* lsah = (struct lsa_header *) STREAM_PNT (s); */ | |
2147 | size -= OSPF_LSA_HEADER_SIZE; | |
9985f83c | 2148 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 2149 | |
2150 | if (lsa->data->type < OSPF_MIN_LSA || lsa->data->type >= OSPF_MAX_LSA) | |
2151 | { | |
2152 | lsa->data = NULL; | |
2153 | ospf_lsa_discard (lsa); | |
2154 | continue; | |
2155 | } | |
2156 | ||
2157 | lsr = ospf_ls_retransmit_lookup (nbr, lsa); | |
2158 | ||
49d7af11 | 2159 | if (lsr != NULL && ospf_lsa_more_recent (lsr, lsa) == 0) |
718e3744 | 2160 | { |
2161 | #ifdef HAVE_OPAQUE_LSA | |
718e3744 | 2162 | if (IS_OPAQUE_LSA (lsr->data->type)) |
69310a67 | 2163 | ospf_opaque_ls_ack_received (nbr, lsr); |
718e3744 | 2164 | #endif /* HAVE_OPAQUE_LSA */ |
2165 | ||
2166 | ospf_ls_retransmit_delete (nbr, lsr); | |
2167 | } | |
2168 | ||
2169 | lsa->data = NULL; | |
2170 | ospf_lsa_discard (lsa); | |
2171 | } | |
2172 | ||
718e3744 | 2173 | return; |
718e3744 | 2174 | } |
6b0655a2 | 2175 | |
038163fa | 2176 | static struct stream * |
5c33349b | 2177 | ospf_recv_packet (int fd, struct interface **ifp, struct stream *ibuf) |
718e3744 | 2178 | { |
2179 | int ret; | |
5c33349b | 2180 | struct ip *iph; |
718e3744 | 2181 | u_int16_t ip_len; |
718e3744 | 2182 | unsigned int ifindex = 0; |
2183 | struct iovec iov; | |
d0deca68 | 2184 | /* Header and data both require alignment. */ |
e304982e | 2185 | char buff [CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; |
2dd8bb4e | 2186 | struct msghdr msgh; |
2187 | ||
68defd6d | 2188 | memset (&msgh, 0, sizeof (struct msghdr)); |
2dd8bb4e | 2189 | msgh.msg_iov = &iov; |
2190 | msgh.msg_iovlen = 1; | |
2191 | msgh.msg_control = (caddr_t) buff; | |
2192 | msgh.msg_controllen = sizeof (buff); | |
2dd8bb4e | 2193 | |
5c33349b | 2194 | ret = stream_recvmsg (ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE+1); |
2195 | if (ret < 0) | |
718e3744 | 2196 | { |
5c33349b | 2197 | zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno)); |
2198 | return NULL; | |
2199 | } | |
69310a67 | 2200 | if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */ |
5c33349b | 2201 | { |
2202 | zlog_warn("ospf_recv_packet: discarding runt packet of length %d " | |
2203 | "(ip header size is %u)", | |
2204 | ret, (u_int)sizeof(iph)); | |
718e3744 | 2205 | return NULL; |
2206 | } | |
18b12c38 | 2207 | |
5c33349b | 2208 | /* Note that there should not be alignment problems with this assignment |
2209 | because this is at the beginning of the stream data buffer. */ | |
2210 | iph = (struct ip *) STREAM_DATA(ibuf); | |
2211 | sockopt_iphdrincl_swab_systoh (iph); | |
18b12c38 | 2212 | |
5c33349b | 2213 | ip_len = iph->ip_len; |
6b333611 | 2214 | |
de5ccb96 | 2215 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000) |
718e3744 | 2216 | /* |
2217 | * Kernel network code touches incoming IP header parameters, | |
2218 | * before protocol specific processing. | |
2219 | * | |
2220 | * 1) Convert byteorder to host representation. | |
2221 | * --> ip_len, ip_id, ip_off | |
2222 | * | |
2223 | * 2) Adjust ip_len to strip IP header size! | |
2224 | * --> If user process receives entire IP packet via RAW | |
2225 | * socket, it must consider adding IP header size to | |
2226 | * the "ip_len" field of "ip" structure. | |
2227 | * | |
2228 | * For more details, see <netinet/ip_input.c>. | |
2229 | */ | |
5c33349b | 2230 | ip_len = ip_len + (iph->ip_hl << 2); |
718e3744 | 2231 | #endif |
2232 | ||
0150c9c9 DB |
2233 | #if defined(__DragonFly__) |
2234 | /* | |
2235 | * in DragonFly's raw socket, ip_len/ip_off are read | |
2236 | * in network byte order. | |
2237 | * As OpenBSD < 200311 adjust ip_len to strip IP header size! | |
2238 | */ | |
2239 | ip_len = ntohs(iph->ip_len) + (iph->ip_hl << 2); | |
2240 | #endif | |
2241 | ||
863082d5 | 2242 | ifindex = getsockopt_ifindex (AF_INET, &msgh); |
718e3744 | 2243 | |
2244 | *ifp = if_lookup_by_index (ifindex); | |
2245 | ||
2246 | if (ret != ip_len) | |
2247 | { | |
5c33349b | 2248 | zlog_warn ("ospf_recv_packet read length mismatch: ip_len is %d, " |
2249 | "but recvmsg returned %d", ip_len, ret); | |
718e3744 | 2250 | return NULL; |
2251 | } | |
2252 | ||
2253 | return ibuf; | |
2254 | } | |
2255 | ||
4dadc291 | 2256 | static struct ospf_interface * |
d3f0d621 | 2257 | ospf_associate_packet_vl (struct ospf *ospf, struct interface *ifp, |
718e3744 | 2258 | struct ip *iph, struct ospf_header *ospfh) |
2259 | { | |
2260 | struct ospf_interface *rcv_oi; | |
718e3744 | 2261 | struct ospf_vl_data *vl_data; |
2262 | struct ospf_area *vl_area; | |
52dc7ee6 | 2263 | struct listnode *node; |
718e3744 | 2264 | |
2265 | if (IN_MULTICAST (ntohl (iph->ip_dst.s_addr)) || | |
2266 | !OSPF_IS_AREA_BACKBONE (ospfh)) | |
d3f0d621 | 2267 | return NULL; |
718e3744 | 2268 | |
d3f0d621 | 2269 | /* look for local OSPF interface matching the destination |
2270 | * to determine Area ID. We presume therefore the destination address | |
2271 | * is unique, or at least (for "unnumbered" links), not used in other | |
2272 | * areas | |
2273 | */ | |
2274 | if ((rcv_oi = ospf_if_lookup_by_local_addr (ospf, NULL, | |
2275 | iph->ip_dst)) == NULL) | |
2276 | return NULL; | |
718e3744 | 2277 | |
1eb8ef25 | 2278 | for (ALL_LIST_ELEMENTS_RO (ospf->vlinks, node, vl_data)) |
718e3744 | 2279 | { |
020709f9 | 2280 | vl_area = ospf_area_lookup_by_area_id (ospf, vl_data->vl_area_id); |
718e3744 | 2281 | if (!vl_area) |
2282 | continue; | |
2283 | ||
2284 | if (OSPF_AREA_SAME (&vl_area, &rcv_oi->area) && | |
2285 | IPV4_ADDR_SAME (&vl_data->vl_peer, &ospfh->router_id)) | |
2286 | { | |
2287 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2288 | zlog_debug ("associating packet with %s", |
718e3744 | 2289 | IF_NAME (vl_data->vl_oi)); |
2290 | if (! CHECK_FLAG (vl_data->vl_oi->ifp->flags, IFF_UP)) | |
2291 | { | |
2292 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2293 | zlog_debug ("This VL is not up yet, sorry"); |
718e3744 | 2294 | return NULL; |
2295 | } | |
2296 | ||
2297 | return vl_data->vl_oi; | |
2298 | } | |
2299 | } | |
2300 | ||
2301 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2302 | zlog_debug ("couldn't find any VL to associate the packet with"); |
718e3744 | 2303 | |
d3f0d621 | 2304 | return NULL; |
718e3744 | 2305 | } |
2306 | ||
f63f06da | 2307 | static int |
718e3744 | 2308 | ospf_check_area_id (struct ospf_interface *oi, struct ospf_header *ospfh) |
2309 | { | |
2310 | /* Check match the Area ID of the receiving interface. */ | |
2311 | if (OSPF_AREA_SAME (&oi->area, &ospfh)) | |
2312 | return 1; | |
2313 | ||
2314 | return 0; | |
2315 | } | |
2316 | ||
2317 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2318 | To prevent it, compare src IP address and i/f address with masking | |
2319 | i/f network mask. */ | |
4dadc291 | 2320 | static int |
718e3744 | 2321 | ospf_check_network_mask (struct ospf_interface *oi, struct in_addr ip_src) |
2322 | { | |
2323 | struct in_addr mask, me, him; | |
2324 | ||
2325 | if (oi->type == OSPF_IFTYPE_POINTOPOINT || | |
2326 | oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2327 | return 1; | |
2328 | ||
2329 | masklen2ip (oi->address->prefixlen, &mask); | |
2330 | ||
2331 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
2332 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
2333 | ||
2334 | if (IPV4_ADDR_SAME (&me, &him)) | |
2335 | return 1; | |
2336 | ||
2337 | return 0; | |
2338 | } | |
2339 | ||
bd5651f0 DO |
2340 | /* Return 1, if the packet is properly authenticated and checksummed, |
2341 | 0 otherwise. In particular, check that AuType header field is valid and | |
2342 | matches the locally configured AuType, and that D.5 requirements are met. */ | |
4dadc291 | 2343 | static int |
e5259148 | 2344 | ospf_check_auth (struct ospf_interface *oi, struct ospf_header *ospfh) |
718e3744 | 2345 | { |
718e3744 | 2346 | struct crypt_key *ck; |
bd5651f0 DO |
2347 | u_int16_t iface_auth_type; |
2348 | u_int16_t pkt_auth_type = ntohs (ospfh->auth_type); | |
718e3744 | 2349 | |
bd5651f0 DO |
2350 | switch (pkt_auth_type) |
2351 | { | |
2352 | case OSPF_AUTH_NULL: /* RFC2328 D.5.1 */ | |
2353 | if (OSPF_AUTH_NULL != (iface_auth_type = ospf_auth_type (oi))) | |
718e3744 | 2354 | { |
bd5651f0 DO |
2355 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2356 | zlog_warn ("interface %s: auth-type mismatch, local %s, rcvd Null", | |
2357 | IF_NAME (oi), LOOKUP (ospf_auth_type_str, iface_auth_type)); | |
2358 | return 0; | |
718e3744 | 2359 | } |
bd5651f0 DO |
2360 | if (! ospf_check_sum (ospfh)) |
2361 | { | |
2362 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2363 | zlog_warn ("interface %s: Null auth OK, but checksum error, Router-ID %s", | |
2364 | IF_NAME (oi), inet_ntoa (ospfh->router_id)); | |
2365 | return 0; | |
2366 | } | |
2367 | return 1; | |
2368 | case OSPF_AUTH_SIMPLE: /* RFC2328 D.5.2 */ | |
2369 | if (OSPF_AUTH_SIMPLE != (iface_auth_type = ospf_auth_type (oi))) | |
2370 | { | |
2371 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2372 | zlog_warn ("interface %s: auth-type mismatch, local %s, rcvd Simple", | |
2373 | IF_NAME (oi), LOOKUP (ospf_auth_type_str, iface_auth_type)); | |
2374 | return 0; | |
2375 | } | |
2376 | if (memcmp (OSPF_IF_PARAM (oi, auth_simple), ospfh->u.auth_data, OSPF_AUTH_SIMPLE_SIZE)) | |
2377 | { | |
2378 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2379 | zlog_warn ("interface %s: Simple auth failed", IF_NAME (oi)); | |
2380 | return 0; | |
2381 | } | |
2382 | if (! ospf_check_sum (ospfh)) | |
2383 | { | |
2384 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2385 | zlog_warn ("interface %s: Simple auth OK, checksum error, Router-ID %s", | |
2386 | IF_NAME (oi), inet_ntoa (ospfh->router_id)); | |
2387 | return 0; | |
2388 | } | |
2389 | return 1; | |
2390 | case OSPF_AUTH_CRYPTOGRAPHIC: /* RFC2328 D.5.3 */ | |
2391 | if (OSPF_AUTH_CRYPTOGRAPHIC != (iface_auth_type = ospf_auth_type (oi))) | |
2392 | { | |
2393 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2394 | zlog_warn ("interface %s: auth-type mismatch, local %s, rcvd Cryptographic", | |
2395 | IF_NAME (oi), LOOKUP (ospf_auth_type_str, iface_auth_type)); | |
2396 | return 0; | |
2397 | } | |
2398 | if (ospfh->checksum) | |
2399 | { | |
2400 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2401 | zlog_warn ("interface %s: OSPF header checksum is not 0", IF_NAME (oi)); | |
2402 | return 0; | |
2403 | } | |
2404 | /* only MD5 crypto method can pass ospf_packet_examin() */ | |
2405 | if | |
2406 | ( | |
2407 | NULL == (ck = listgetdata (listtail(OSPF_IF_PARAM (oi,auth_crypt)))) || | |
2408 | ospfh->u.crypt.key_id != ck->key_id || | |
2409 | /* Condition above uses the last key ID on the list, which is | |
2410 | different from what ospf_crypt_key_lookup() does. A bug? */ | |
2411 | ! ospf_check_md5_digest (oi, ospfh) | |
2412 | ) | |
2413 | { | |
2414 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2415 | zlog_warn ("interface %s: MD5 auth failed", IF_NAME (oi)); | |
2416 | return 0; | |
2417 | } | |
2418 | return 1; | |
2419 | default: | |
2420 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
2421 | zlog_warn ("interface %s: invalid packet auth-type (%02x)", | |
2422 | IF_NAME (oi), pkt_auth_type); | |
2423 | return 0; | |
2424 | } | |
718e3744 | 2425 | } |
2426 | ||
4dadc291 | 2427 | static int |
718e3744 | 2428 | ospf_check_sum (struct ospf_header *ospfh) |
2429 | { | |
2430 | u_int32_t ret; | |
2431 | u_int16_t sum; | |
718e3744 | 2432 | |
2433 | /* clear auth_data for checksum. */ | |
2434 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2435 | ||
2436 | /* keep checksum and clear. */ | |
2437 | sum = ospfh->checksum; | |
2438 | memset (&ospfh->checksum, 0, sizeof (u_int16_t)); | |
2439 | ||
2440 | /* calculate checksum. */ | |
2441 | ret = in_cksum (ospfh, ntohs (ospfh->length)); | |
2442 | ||
2443 | if (ret != sum) | |
2444 | { | |
2445 | zlog_info ("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2446 | ret, sum); | |
2447 | return 0; | |
2448 | } | |
2449 | ||
2450 | return 1; | |
2451 | } | |
2452 | ||
4e31de79 DO |
2453 | /* Verify, that given link/TOS records are properly sized/aligned and match |
2454 | Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */ | |
2455 | static unsigned | |
2456 | ospf_router_lsa_links_examin | |
2457 | ( | |
2458 | struct router_lsa_link * link, | |
2459 | u_int16_t linkbytes, | |
2460 | const u_int16_t num_links | |
2461 | ) | |
2462 | { | |
2463 | unsigned counted_links = 0, thislinklen; | |
2464 | ||
2465 | while (linkbytes) | |
2466 | { | |
2467 | thislinklen = OSPF_ROUTER_LSA_LINK_SIZE + 4 * link->m[0].tos_count; | |
2468 | if (thislinklen > linkbytes) | |
2469 | { | |
2470 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2471 | zlog_debug ("%s: length error in link block #%u", __func__, counted_links); | |
2472 | return MSG_NG; | |
2473 | } | |
2474 | link = (struct router_lsa_link *)((caddr_t) link + thislinklen); | |
2475 | linkbytes -= thislinklen; | |
2476 | counted_links++; | |
2477 | } | |
2478 | if (counted_links != num_links) | |
2479 | { | |
2480 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2481 | zlog_debug ("%s: %u link blocks declared, %u present", | |
2482 | __func__, num_links, counted_links); | |
2483 | return MSG_NG; | |
2484 | } | |
2485 | return MSG_OK; | |
2486 | } | |
2487 | ||
2488 | /* Verify, that the given LSA is properly sized/aligned (including type-specific | |
2489 | minimum length constraint). */ | |
2490 | static unsigned | |
2491 | ospf_lsa_examin (struct lsa_header * lsah, const u_int16_t lsalen, const u_char headeronly) | |
2492 | { | |
2493 | unsigned ret; | |
2494 | struct router_lsa * rlsa; | |
2495 | if | |
2496 | ( | |
2497 | lsah->type < OSPF_MAX_LSA && | |
2498 | ospf_lsa_minlen[lsah->type] && | |
2499 | lsalen < OSPF_LSA_HEADER_SIZE + ospf_lsa_minlen[lsah->type] | |
2500 | ) | |
2501 | { | |
2502 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2503 | zlog_debug ("%s: undersized (%u B) %s", | |
2504 | __func__, lsalen, LOOKUP (ospf_lsa_type_msg, lsah->type)); | |
2505 | return MSG_NG; | |
2506 | } | |
2507 | switch (lsah->type) | |
2508 | { | |
2509 | case OSPF_ROUTER_LSA: | |
2510 | /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1 (12+)-byte link blocks */ | |
2511 | if (headeronly) | |
2512 | { | |
2513 | ret = (lsalen - OSPF_LSA_HEADER_SIZE - OSPF_ROUTER_LSA_MIN_SIZE) % 4 ? MSG_NG : MSG_OK; | |
2514 | break; | |
2515 | } | |
2516 | rlsa = (struct router_lsa *) lsah; | |
2517 | ret = ospf_router_lsa_links_examin | |
2518 | ( | |
2519 | (struct router_lsa_link *) rlsa->link, | |
2520 | lsalen - OSPF_LSA_HEADER_SIZE - 4, /* skip: basic header, "flags", 0, "# links" */ | |
2521 | ntohs (rlsa->links) /* 16 bits */ | |
2522 | ); | |
2523 | break; | |
2524 | case OSPF_AS_EXTERNAL_LSA: | |
2525 | /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long blocks */ | |
2526 | case OSPF_AS_NSSA_LSA: | |
2527 | /* RFC3101 C, idem */ | |
2528 | ret = (lsalen - OSPF_LSA_HEADER_SIZE - OSPF_AS_EXTERNAL_LSA_MIN_SIZE) % 12 ? MSG_NG : MSG_OK; | |
2529 | break; | |
2530 | /* Following LSA types are considered OK length-wise as soon as their minimum | |
2531 | * length constraint is met and length of the whole LSA is a multiple of 4 | |
2532 | * (basic LSA header size is already a multiple of 4). */ | |
2533 | case OSPF_NETWORK_LSA: | |
2534 | /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */ | |
2535 | case OSPF_SUMMARY_LSA: | |
2536 | case OSPF_ASBR_SUMMARY_LSA: | |
2537 | /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS blocks */ | |
2538 | #ifdef HAVE_OPAQUE_LSA | |
2539 | case OSPF_OPAQUE_LINK_LSA: | |
2540 | case OSPF_OPAQUE_AREA_LSA: | |
2541 | case OSPF_OPAQUE_AS_LSA: | |
2542 | /* RFC5250 A.2, "some number of octets (of application-specific | |
2543 | * data) padded to 32-bit alignment." This is considered equivalent | |
2544 | * to 4-byte alignment of all other LSA types, see OSPF-ALIGNMENT.txt | |
2545 | * file for the detailed analysis of this passage. */ | |
2546 | #endif | |
2547 | ret = lsalen % 4 ? MSG_NG : MSG_OK; | |
2548 | break; | |
2549 | default: | |
2550 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2551 | zlog_debug ("%s: unsupported LSA type 0x%02x", __func__, lsah->type); | |
2552 | return MSG_NG; | |
2553 | } | |
2554 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2555 | zlog_debug ("%s: alignment error in %s", | |
2556 | __func__, LOOKUP (ospf_lsa_type_msg, lsah->type)); | |
2557 | return ret; | |
2558 | } | |
2559 | ||
2560 | /* Verify if the provided input buffer is a valid sequence of LSAs. This | |
2561 | includes verification of LSA blocks length/alignment and dispatching | |
2562 | of deeper-level checks. */ | |
2563 | static unsigned | |
2564 | ospf_lsaseq_examin | |
2565 | ( | |
2566 | struct lsa_header *lsah, /* start of buffered data */ | |
2567 | size_t length, | |
2568 | const u_char headeronly, | |
2569 | /* When declared_num_lsas is not 0, compare it to the real number of LSAs | |
2570 | and treat the difference as an error. */ | |
2571 | const u_int32_t declared_num_lsas | |
2572 | ) | |
2573 | { | |
2574 | u_int32_t counted_lsas = 0; | |
2575 | ||
2576 | while (length) | |
2577 | { | |
2578 | u_int16_t lsalen; | |
2579 | if (length < OSPF_LSA_HEADER_SIZE) | |
2580 | { | |
2581 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2582 | zlog_debug ("%s: undersized (%zu B) trailing (#%u) LSA header", | |
2583 | __func__, length, counted_lsas); | |
2584 | return MSG_NG; | |
2585 | } | |
2586 | /* save on ntohs() calls here and in the LSA validator */ | |
2587 | lsalen = ntohs (lsah->length); | |
2588 | if (lsalen < OSPF_LSA_HEADER_SIZE) | |
2589 | { | |
2590 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2591 | zlog_debug ("%s: malformed LSA header #%u, declared length is %u B", | |
2592 | __func__, counted_lsas, lsalen); | |
2593 | return MSG_NG; | |
2594 | } | |
2595 | if (headeronly) | |
2596 | { | |
2597 | /* less checks here and in ospf_lsa_examin() */ | |
2598 | if (MSG_OK != ospf_lsa_examin (lsah, lsalen, 1)) | |
2599 | { | |
2600 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2601 | zlog_debug ("%s: malformed header-only LSA #%u", __func__, counted_lsas); | |
2602 | return MSG_NG; | |
2603 | } | |
2604 | lsah = (struct lsa_header *) ((caddr_t) lsah + OSPF_LSA_HEADER_SIZE); | |
2605 | length -= OSPF_LSA_HEADER_SIZE; | |
2606 | } | |
2607 | else | |
2608 | { | |
2609 | /* make sure the input buffer is deep enough before further checks */ | |
2610 | if (lsalen > length) | |
2611 | { | |
2612 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2613 | zlog_debug ("%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B", | |
2614 | __func__, counted_lsas, lsalen, length); | |
2615 | return MSG_NG; | |
2616 | } | |
2617 | if (MSG_OK != ospf_lsa_examin (lsah, lsalen, 0)) | |
2618 | { | |
2619 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2620 | zlog_debug ("%s: malformed LSA #%u", __func__, counted_lsas); | |
2621 | return MSG_NG; | |
2622 | } | |
2623 | lsah = (struct lsa_header *) ((caddr_t) lsah + lsalen); | |
2624 | length -= lsalen; | |
2625 | } | |
2626 | counted_lsas++; | |
2627 | } | |
2628 | ||
2629 | if (declared_num_lsas && counted_lsas != declared_num_lsas) | |
2630 | { | |
2631 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2632 | zlog_debug ("%s: #LSAs declared (%u) does not match actual (%u)", | |
2633 | __func__, declared_num_lsas, counted_lsas); | |
2634 | return MSG_NG; | |
2635 | } | |
2636 | return MSG_OK; | |
2637 | } | |
2638 | ||
75c8eabb DO |
2639 | /* Verify a complete OSPF packet for proper sizing/alignment. */ |
2640 | static unsigned | |
2641 | ospf_packet_examin (struct ospf_header * oh, const unsigned bytesonwire) | |
2642 | { | |
bd5651f0 | 2643 | u_int16_t bytesdeclared, bytesauth; |
4e31de79 DO |
2644 | unsigned ret; |
2645 | struct ospf_ls_update * lsupd; | |
75c8eabb DO |
2646 | |
2647 | /* Length, 1st approximation. */ | |
2648 | if (bytesonwire < OSPF_HEADER_SIZE) | |
2649 | { | |
2650 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2651 | zlog_debug ("%s: undersized (%u B) packet", __func__, bytesonwire); | |
2652 | return MSG_NG; | |
2653 | } | |
2654 | /* Now it is safe to access header fields. Performing length check, allow | |
2655 | * for possible extra bytes of crypto auth/padding, which are not counted | |
2656 | * in the OSPF header "length" field. */ | |
aee56745 DO |
2657 | if (oh->version != OSPF_VERSION) |
2658 | { | |
2659 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2660 | zlog_debug ("%s: invalid (%u) protocol version", __func__, oh->version); | |
2661 | return MSG_NG; | |
2662 | } | |
75c8eabb | 2663 | bytesdeclared = ntohs (oh->length); |
bd5651f0 DO |
2664 | if (ntohs (oh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) |
2665 | bytesauth = 0; | |
2666 | else | |
2667 | { | |
2668 | if (oh->u.crypt.auth_data_len != OSPF_AUTH_MD5_SIZE) | |
2669 | { | |
2670 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2671 | zlog_debug ("%s: unsupported crypto auth length (%u B)", | |
2672 | __func__, oh->u.crypt.auth_data_len); | |
2673 | return MSG_NG; | |
2674 | } | |
2675 | bytesauth = OSPF_AUTH_MD5_SIZE; | |
2676 | } | |
2677 | if (bytesdeclared + bytesauth > bytesonwire) | |
75c8eabb DO |
2678 | { |
2679 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
bd5651f0 DO |
2680 | zlog_debug ("%s: packet length error (%u real, %u+%u declared)", |
2681 | __func__, bytesonwire, bytesdeclared, bytesauth); | |
75c8eabb DO |
2682 | return MSG_NG; |
2683 | } | |
2684 | /* Length, 2nd approximation. The type-specific constraint is checked | |
2685 | against declared length, not amount of bytes on wire. */ | |
2686 | if | |
2687 | ( | |
2688 | oh->type >= OSPF_MSG_HELLO && | |
2689 | oh->type <= OSPF_MSG_LS_ACK && | |
2690 | bytesdeclared < OSPF_HEADER_SIZE + ospf_packet_minlen[oh->type] | |
2691 | ) | |
2692 | { | |
2693 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2694 | zlog_debug ("%s: undersized (%u B) %s packet", __func__, | |
2695 | bytesdeclared, LOOKUP (ospf_packet_type_str, oh->type)); | |
2696 | return MSG_NG; | |
2697 | } | |
4e31de79 DO |
2698 | switch (oh->type) |
2699 | { | |
2700 | case OSPF_MSG_HELLO: | |
2701 | /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes followed | |
2702 | by N>=0 router-IDs. */ | |
b29adf9c | 2703 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_HELLO_MIN_SIZE) % 4 ? MSG_NG : MSG_OK; |
4e31de79 DO |
2704 | break; |
2705 | case OSPF_MSG_DB_DESC: | |
2706 | /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes followed | |
2707 | by N>=0 header-only LSAs. */ | |
2708 | ret = ospf_lsaseq_examin | |
2709 | ( | |
2710 | (struct lsa_header *) ((caddr_t) oh + OSPF_HEADER_SIZE + OSPF_DB_DESC_MIN_SIZE), | |
b29adf9c | 2711 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_DB_DESC_MIN_SIZE, |
4e31de79 DO |
2712 | 1, /* header-only LSAs */ |
2713 | 0 | |
2714 | ); | |
2715 | break; | |
2716 | case OSPF_MSG_LS_REQ: | |
2717 | /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes request blocks. */ | |
b29adf9c | 2718 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_REQ_MIN_SIZE) % |
4e31de79 DO |
2719 | OSPF_LSA_KEY_SIZE ? MSG_NG : MSG_OK; |
2720 | break; | |
2721 | case OSPF_MSG_LS_UPD: | |
2722 | /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes followed | |
2723 | by N>=0 full LSAs (with N declared beforehand). */ | |
2724 | lsupd = (struct ospf_ls_update *) ((caddr_t) oh + OSPF_HEADER_SIZE); | |
2725 | ret = ospf_lsaseq_examin | |
2726 | ( | |
2727 | (struct lsa_header *) ((caddr_t) lsupd + OSPF_LS_UPD_MIN_SIZE), | |
b29adf9c | 2728 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_UPD_MIN_SIZE, |
4e31de79 DO |
2729 | 0, /* full LSAs */ |
2730 | ntohl (lsupd->num_lsas) /* 32 bits */ | |
2731 | ); | |
2732 | break; | |
2733 | case OSPF_MSG_LS_ACK: | |
2734 | /* RFC2328 A.3.6, packet header followed by N>=0 header-only LSAs. */ | |
2735 | ret = ospf_lsaseq_examin | |
2736 | ( | |
2737 | (struct lsa_header *) ((caddr_t) oh + OSPF_HEADER_SIZE + OSPF_LS_ACK_MIN_SIZE), | |
b29adf9c | 2738 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_ACK_MIN_SIZE, |
4e31de79 DO |
2739 | 1, /* header-only LSAs */ |
2740 | 0 | |
2741 | ); | |
2742 | break; | |
2743 | default: | |
2744 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2745 | zlog_debug ("%s: invalid packet type 0x%02x", __func__, oh->type); | |
2746 | return MSG_NG; | |
2747 | } | |
2748 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2749 | zlog_debug ("%s: malformed %s packet", __func__, LOOKUP (ospf_packet_type_str, oh->type)); | |
2750 | return ret; | |
75c8eabb DO |
2751 | } |
2752 | ||
718e3744 | 2753 | /* OSPF Header verification. */ |
4dadc291 | 2754 | static int |
718e3744 | 2755 | ospf_verify_header (struct stream *ibuf, struct ospf_interface *oi, |
2756 | struct ip *iph, struct ospf_header *ospfh) | |
2757 | { | |
718e3744 | 2758 | /* Check Area ID. */ |
2759 | if (!ospf_check_area_id (oi, ospfh)) | |
2760 | { | |
2761 | zlog_warn ("interface %s: ospf_read invalid Area ID %s.", | |
2762 | IF_NAME (oi), inet_ntoa (ospfh->area_id)); | |
2763 | return -1; | |
2764 | } | |
2765 | ||
2766 | /* Check network mask, Silently discarded. */ | |
2767 | if (! ospf_check_network_mask (oi, iph->ip_src)) | |
2768 | { | |
2769 | zlog_warn ("interface %s: ospf_read network address is not same [%s]", | |
2770 | IF_NAME (oi), inet_ntoa (iph->ip_src)); | |
2771 | return -1; | |
2772 | } | |
2773 | ||
bd5651f0 | 2774 | /* Check authentication. The function handles logging actions, where required. */ |
e5259148 | 2775 | if (! ospf_check_auth (oi, ospfh)) |
bd5651f0 | 2776 | return -1; |
718e3744 | 2777 | |
2778 | return 0; | |
2779 | } | |
2780 | ||
2781 | /* Starting point of packet process function. */ | |
2782 | int | |
2783 | ospf_read (struct thread *thread) | |
2784 | { | |
2785 | int ret; | |
2786 | struct stream *ibuf; | |
68980084 | 2787 | struct ospf *ospf; |
718e3744 | 2788 | struct ospf_interface *oi; |
2789 | struct ip *iph; | |
2790 | struct ospf_header *ospfh; | |
2791 | u_int16_t length; | |
2792 | struct interface *ifp; | |
2793 | ||
2794 | /* first of all get interface pointer. */ | |
68980084 | 2795 | ospf = THREAD_ARG (thread); |
038163fa | 2796 | |
2797 | /* prepare for next packet. */ | |
2798 | ospf->t_read = thread_add_read (master, ospf_read, ospf, ospf->fd); | |
718e3744 | 2799 | |
5c33349b | 2800 | stream_reset(ospf->ibuf); |
2801 | if (!(ibuf = ospf_recv_packet (ospf->fd, &ifp, ospf->ibuf))) | |
718e3744 | 2802 | return -1; |
75c8eabb | 2803 | /* This raw packet is known to be at least as big as its IP header. */ |
718e3744 | 2804 | |
5c33349b | 2805 | /* Note that there should not be alignment problems with this assignment |
2806 | because this is at the beginning of the stream data buffer. */ | |
06f953f7 | 2807 | iph = (struct ip *) STREAM_DATA (ibuf); |
5c33349b | 2808 | /* Note that sockopt_iphdrincl_swab_systoh was called in ospf_recv_packet. */ |
06f953f7 | 2809 | |
ac191232 | 2810 | if (ifp == NULL) |
b87f772a | 2811 | /* Handle cases where the platform does not support retrieving the ifindex, |
2812 | and also platforms (such as Solaris 8) that claim to support ifindex | |
2813 | retrieval but do not. */ | |
ac191232 | 2814 | ifp = if_lookup_address (iph->ip_src); |
ac191232 | 2815 | |
d3f0d621 | 2816 | if (ifp == NULL) |
5c33349b | 2817 | return 0; |
718e3744 | 2818 | |
2819 | /* IP Header dump. */ | |
17b78d38 | 2820 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) |
6b333611 | 2821 | ospf_ip_header_dump (iph); |
7d95c611 | 2822 | |
718e3744 | 2823 | /* Self-originated packet should be discarded silently. */ |
68980084 | 2824 | if (ospf_if_lookup_by_local_addr (ospf, NULL, iph->ip_src)) |
718e3744 | 2825 | { |
d324181c | 2826 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) |
2827 | { | |
2a42e285 | 2828 | zlog_debug ("ospf_read[%s]: Dropping self-originated packet", |
d324181c | 2829 | inet_ntoa (iph->ip_src)); |
2830 | } | |
718e3744 | 2831 | return 0; |
2832 | } | |
2833 | ||
61ab0301 DO |
2834 | /* Advance from IP header to OSPF header (iph->ip_hl has been verified |
2835 | by ospf_recv_packet() to be correct). */ | |
9985f83c | 2836 | stream_forward_getp (ibuf, iph->ip_hl * 4); |
61ab0301 | 2837 | |
75c8eabb DO |
2838 | ospfh = (struct ospf_header *) STREAM_PNT (ibuf); |
2839 | if (MSG_OK != ospf_packet_examin (ospfh, stream_get_endp (ibuf) - stream_get_getp (ibuf))) | |
61ab0301 | 2840 | return -1; |
61ab0301 | 2841 | /* Now it is safe to access all fields of OSPF packet header. */ |
718e3744 | 2842 | |
2843 | /* associate packet with ospf interface */ | |
05cf46ba | 2844 | oi = ospf_if_lookup_recv_if (ospf, iph->ip_src, ifp); |
d3f0d621 | 2845 | |
3aad46bd YS |
2846 | /* ospf_verify_header() relies on a valid "oi" and thus can be called only |
2847 | after the passive/backbone/other checks below are passed. These checks | |
2848 | in turn access the fields of unverified "ospfh" structure for their own | |
2849 | purposes and must remain very accurate in doing this. */ | |
71775043 | 2850 | |
491eddc2 JT |
2851 | /* If incoming interface is passive one, ignore it. */ |
2852 | if (oi && OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) | |
2853 | { | |
2854 | char buf[3][INET_ADDRSTRLEN]; | |
2855 | ||
2856 | if (IS_DEBUG_OSPF_EVENT) | |
2857 | zlog_debug ("ignoring packet from router %s sent to %s, " | |
2858 | "received on a passive interface, %s", | |
2859 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], sizeof(buf[0])), | |
2860 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2861 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
2862 | buf[2], sizeof(buf[2]))); | |
2863 | ||
2864 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
2865 | { | |
2866 | /* Try to fix multicast membership. | |
2867 | * Some OS:es may have problems in this area, | |
2868 | * make sure it is removed. | |
2869 | */ | |
2870 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
2871 | ospf_if_set_multicast(oi); | |
2872 | } | |
2873 | return 0; | |
2874 | } | |
2875 | ||
2876 | ||
d3f0d621 | 2877 | /* if no local ospf_interface, |
2878 | * or header area is backbone but ospf_interface is not | |
2879 | * check for VLINK interface | |
2880 | */ | |
2881 | if ( (oi == NULL) || | |
2882 | (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) | |
2883 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id)) | |
2884 | ) | |
718e3744 | 2885 | { |
d3f0d621 | 2886 | if ((oi = ospf_associate_packet_vl (ospf, ifp, iph, ospfh)) == NULL) |
d324181c | 2887 | { |
7c8ff89e | 2888 | if (!ospf->instance && IS_DEBUG_OSPF_EVENT) |
88871b1d PJ |
2889 | zlog_debug ("Packet from [%s] received on link %s" |
2890 | " but no ospf_interface", | |
2891 | inet_ntoa (iph->ip_src), ifp->name); | |
d3f0d621 | 2892 | return 0; |
d324181c | 2893 | } |
d3f0d621 | 2894 | } |
05cf46ba | 2895 | |
d3f0d621 | 2896 | /* else it must be a local ospf interface, check it was received on |
2897 | * correct link | |
2898 | */ | |
2899 | else if (oi->ifp != ifp) | |
2900 | { | |
11637435 PJ |
2901 | if (IS_DEBUG_OSPF_EVENT) |
2902 | zlog_warn ("Packet from [%s] received on wrong link %s", | |
2903 | inet_ntoa (iph->ip_src), ifp->name); | |
718e3744 | 2904 | return 0; |
2905 | } | |
847947f2 | 2906 | else if (oi->state == ISM_Down) |
c3eab871 | 2907 | { |
ba6454ec | 2908 | char buf[2][INET_ADDRSTRLEN]; |
2909 | zlog_warn ("Ignoring packet from %s to %s received on interface that is " | |
847947f2 | 2910 | "down [%s]; interface flags are %s", |
ba6454ec | 2911 | inet_ntop(AF_INET, &iph->ip_src, buf[0], sizeof(buf[0])), |
2912 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2913 | ifp->name, if_flag_dump(ifp->flags)); | |
ba6454ec | 2914 | /* Fix multicast memberships? */ |
2915 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
429ac78c | 2916 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); |
ba6454ec | 2917 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) |
429ac78c | 2918 | OI_MEMBER_JOINED(oi, MEMBER_DROUTERS); |
ba6454ec | 2919 | if (oi->multicast_memberships) |
2920 | ospf_if_set_multicast(oi); | |
c3eab871 | 2921 | return 0; |
2922 | } | |
718e3744 | 2923 | |
2924 | /* | |
2925 | * If the received packet is destined for AllDRouters, the packet | |
2926 | * should be accepted only if the received ospf interface state is | |
2927 | * either DR or Backup -- endo. | |
2928 | */ | |
2929 | if (iph->ip_dst.s_addr == htonl (OSPF_ALLDROUTERS) | |
2930 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) | |
2931 | { | |
ba6454ec | 2932 | zlog_warn ("Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", |
718e3744 | 2933 | inet_ntoa (iph->ip_src), IF_NAME (oi), |
2934 | LOOKUP (ospf_ism_state_msg, oi->state)); | |
ba6454ec | 2935 | /* Try to fix multicast membership. */ |
2936 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
2937 | ospf_if_set_multicast(oi); | |
718e3744 | 2938 | return 0; |
2939 | } | |
2940 | ||
3aad46bd YS |
2941 | /* Verify more OSPF header fields. */ |
2942 | ret = ospf_verify_header (ibuf, oi, iph, ospfh); | |
2943 | if (ret < 0) | |
2944 | { | |
2945 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) | |
2946 | zlog_debug ("ospf_read[%s]: Header check failed, " | |
2947 | "dropping.", | |
2948 | inet_ntoa (iph->ip_src)); | |
2949 | return ret; | |
2950 | } | |
2951 | ||
718e3744 | 2952 | /* Show debug receiving packet. */ |
1aa7b399 | 2953 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2954 | { | |
718e3744 | 2955 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) |
1aa7b399 | 2956 | { |
2a42e285 | 2957 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2958 | ospf_packet_dump (ibuf); |
2959 | } | |
718e3744 | 2960 | |
2a42e285 | 2961 | zlog_debug ("%s received from [%s] via [%s]", |
272ca1e3 | 2962 | LOOKUP (ospf_packet_type_str, ospfh->type), |
1aa7b399 | 2963 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); |
2a42e285 | 2964 | zlog_debug (" src [%s],", inet_ntoa (iph->ip_src)); |
2965 | zlog_debug (" dst [%s]", inet_ntoa (iph->ip_dst)); | |
718e3744 | 2966 | |
2967 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) | |
2a42e285 | 2968 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2969 | } |
718e3744 | 2970 | |
9985f83c | 2971 | stream_forward_getp (ibuf, OSPF_HEADER_SIZE); |
718e3744 | 2972 | |
2973 | /* Adjust size to message length. */ | |
2974 | length = ntohs (ospfh->length) - OSPF_HEADER_SIZE; | |
2975 | ||
2976 | /* Read rest of the packet and call each sort of packet routine. */ | |
2977 | switch (ospfh->type) | |
2978 | { | |
2979 | case OSPF_MSG_HELLO: | |
2980 | ospf_hello (iph, ospfh, ibuf, oi, length); | |
2981 | break; | |
2982 | case OSPF_MSG_DB_DESC: | |
2983 | ospf_db_desc (iph, ospfh, ibuf, oi, length); | |
2984 | break; | |
2985 | case OSPF_MSG_LS_REQ: | |
2986 | ospf_ls_req (iph, ospfh, ibuf, oi, length); | |
2987 | break; | |
2988 | case OSPF_MSG_LS_UPD: | |
ac7424f9 | 2989 | ospf_ls_upd (ospf, iph, ospfh, ibuf, oi, length); |
718e3744 | 2990 | break; |
2991 | case OSPF_MSG_LS_ACK: | |
2992 | ospf_ls_ack (iph, ospfh, ibuf, oi, length); | |
2993 | break; | |
2994 | default: | |
2995 | zlog (NULL, LOG_WARNING, | |
2996 | "interface %s: OSPF packet header type %d is illegal", | |
2997 | IF_NAME (oi), ospfh->type); | |
2998 | break; | |
2999 | } | |
3000 | ||
718e3744 | 3001 | return 0; |
3002 | } | |
3003 | ||
3004 | /* Make OSPF header. */ | |
4dadc291 | 3005 | static void |
718e3744 | 3006 | ospf_make_header (int type, struct ospf_interface *oi, struct stream *s) |
3007 | { | |
3008 | struct ospf_header *ospfh; | |
3009 | ||
3010 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
3011 | ||
3012 | ospfh->version = (u_char) OSPF_VERSION; | |
3013 | ospfh->type = (u_char) type; | |
3014 | ||
68980084 | 3015 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 3016 | |
3017 | ospfh->checksum = 0; | |
3018 | ospfh->area_id = oi->area->area_id; | |
3019 | ospfh->auth_type = htons (ospf_auth_type (oi)); | |
3020 | ||
3021 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
3022 | ||
9985f83c | 3023 | stream_forward_endp (s, OSPF_HEADER_SIZE); |
718e3744 | 3024 | } |
3025 | ||
3026 | /* Make Authentication Data. */ | |
4dadc291 | 3027 | static int |
718e3744 | 3028 | ospf_make_auth (struct ospf_interface *oi, struct ospf_header *ospfh) |
3029 | { | |
3030 | struct crypt_key *ck; | |
3031 | ||
3032 | switch (ospf_auth_type (oi)) | |
3033 | { | |
3034 | case OSPF_AUTH_NULL: | |
3035 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
3036 | break; | |
3037 | case OSPF_AUTH_SIMPLE: | |
3038 | memcpy (ospfh->u.auth_data, OSPF_IF_PARAM (oi, auth_simple), | |
3039 | OSPF_AUTH_SIMPLE_SIZE); | |
3040 | break; | |
3041 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
3042 | /* If key is not set, then set 0. */ | |
3043 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
3044 | { | |
3045 | ospfh->u.crypt.zero = 0; | |
3046 | ospfh->u.crypt.key_id = 0; | |
3047 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3048 | } | |
3049 | else | |
3050 | { | |
1eb8ef25 | 3051 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
718e3744 | 3052 | ospfh->u.crypt.zero = 0; |
3053 | ospfh->u.crypt.key_id = ck->key_id; | |
3054 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3055 | } | |
3056 | /* note: the seq is done in ospf_make_md5_digest() */ | |
3057 | break; | |
3058 | default: | |
3059 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
3060 | break; | |
3061 | } | |
3062 | ||
3063 | return 0; | |
3064 | } | |
3065 | ||
3066 | /* Fill rest of OSPF header. */ | |
4dadc291 | 3067 | static void |
718e3744 | 3068 | ospf_fill_header (struct ospf_interface *oi, |
3069 | struct stream *s, u_int16_t length) | |
3070 | { | |
3071 | struct ospf_header *ospfh; | |
3072 | ||
3073 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
3074 | ||
3075 | /* Fill length. */ | |
3076 | ospfh->length = htons (length); | |
3077 | ||
3078 | /* Calculate checksum. */ | |
3079 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
3080 | ospfh->checksum = in_cksum (ospfh, length); | |
3081 | else | |
3082 | ospfh->checksum = 0; | |
3083 | ||
3084 | /* Add Authentication Data. */ | |
3085 | ospf_make_auth (oi, ospfh); | |
3086 | } | |
3087 | ||
4dadc291 | 3088 | static int |
718e3744 | 3089 | ospf_make_hello (struct ospf_interface *oi, struct stream *s) |
3090 | { | |
3091 | struct ospf_neighbor *nbr; | |
3092 | struct route_node *rn; | |
3093 | u_int16_t length = OSPF_HELLO_MIN_SIZE; | |
3094 | struct in_addr mask; | |
3095 | unsigned long p; | |
3096 | int flag = 0; | |
3097 | ||
3098 | /* Set netmask of interface. */ | |
b2f4a395 DS |
3099 | if (!(CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED) && |
3100 | oi->type == OSPF_IFTYPE_POINTOPOINT) && | |
718e3744 | 3101 | oi->type != OSPF_IFTYPE_VIRTUALLINK) |
3102 | masklen2ip (oi->address->prefixlen, &mask); | |
3103 | else | |
3104 | memset ((char *) &mask, 0, sizeof (struct in_addr)); | |
3105 | stream_put_ipv4 (s, mask.s_addr); | |
3106 | ||
3107 | /* Set Hello Interval. */ | |
f9ad937f | 3108 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) |
3109 | stream_putw (s, OSPF_IF_PARAM (oi, v_hello)); | |
3110 | else | |
3111 | stream_putw (s, 0); /* hello-interval of 0 for fast-hellos */ | |
718e3744 | 3112 | |
3113 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3114 | zlog_debug ("make_hello: options: %x, int: %s", |
718e3744 | 3115 | OPTIONS(oi), IF_NAME (oi)); |
3116 | ||
3117 | /* Set Options. */ | |
3118 | stream_putc (s, OPTIONS (oi)); | |
3119 | ||
3120 | /* Set Router Priority. */ | |
3121 | stream_putc (s, PRIORITY (oi)); | |
3122 | ||
3123 | /* Set Router Dead Interval. */ | |
3124 | stream_putl (s, OSPF_IF_PARAM (oi, v_wait)); | |
3125 | ||
3126 | /* Set Designated Router. */ | |
3127 | stream_put_ipv4 (s, DR (oi).s_addr); | |
3128 | ||
9985f83c | 3129 | p = stream_get_endp (s); |
718e3744 | 3130 | |
3131 | /* Set Backup Designated Router. */ | |
3132 | stream_put_ipv4 (s, BDR (oi).s_addr); | |
3133 | ||
3134 | /* Add neighbor seen. */ | |
3135 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
68980084 | 3136 | if ((nbr = rn->info)) |
3137 | if (nbr->router_id.s_addr != 0) /* Ignore 0.0.0.0 node. */ | |
3138 | if (nbr->state != NSM_Attempt) /* Ignore Down neighbor. */ | |
3139 | if (nbr->state != NSM_Down) /* This is myself for DR election. */ | |
3140 | if (!IPV4_ADDR_SAME (&nbr->router_id, &oi->ospf->router_id)) | |
718e3744 | 3141 | { |
3142 | /* Check neighbor is sane? */ | |
68980084 | 3143 | if (nbr->d_router.s_addr != 0 |
3144 | && IPV4_ADDR_SAME (&nbr->d_router, &oi->address->u.prefix4) | |
3145 | && IPV4_ADDR_SAME (&nbr->bd_router, &oi->address->u.prefix4)) | |
3146 | flag = 1; | |
718e3744 | 3147 | |
3148 | stream_put_ipv4 (s, nbr->router_id.s_addr); | |
3149 | length += 4; | |
3150 | } | |
3151 | ||
3152 | /* Let neighbor generate BackupSeen. */ | |
3153 | if (flag == 1) | |
3a9eb091 | 3154 | stream_putl_at (s, p, 0); /* ipv4 address, normally */ |
718e3744 | 3155 | |
3156 | return length; | |
3157 | } | |
3158 | ||
4dadc291 | 3159 | static int |
718e3744 | 3160 | ospf_make_db_desc (struct ospf_interface *oi, struct ospf_neighbor *nbr, |
3161 | struct stream *s) | |
3162 | { | |
3163 | struct ospf_lsa *lsa; | |
3164 | u_int16_t length = OSPF_DB_DESC_MIN_SIZE; | |
3165 | u_char options; | |
3166 | unsigned long pp; | |
3167 | int i; | |
3168 | struct ospf_lsdb *lsdb; | |
3169 | ||
3170 | /* Set Interface MTU. */ | |
3171 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3172 | stream_putw (s, 0); | |
3173 | else | |
3174 | stream_putw (s, oi->ifp->mtu); | |
3175 | ||
3176 | /* Set Options. */ | |
3177 | options = OPTIONS (oi); | |
3178 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 3179 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 3180 | { |
3181 | if (IS_SET_DD_I (nbr->dd_flags) | |
3182 | || CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
3183 | /* | |
3184 | * Set O-bit in the outgoing DD packet for capablity negotiation, | |
3185 | * if one of following case is applicable. | |
3186 | * | |
3187 | * 1) WaitTimer expiration event triggered the neighbor state to | |
3188 | * change to Exstart, but no (valid) DD packet has received | |
3189 | * from the neighbor yet. | |
3190 | * | |
3191 | * 2) At least one DD packet with O-bit on has received from the | |
3192 | * neighbor. | |
3193 | */ | |
3194 | SET_FLAG (options, OSPF_OPTION_O); | |
3195 | } | |
3196 | #endif /* HAVE_OPAQUE_LSA */ | |
3197 | stream_putc (s, options); | |
3198 | ||
8dd24ee6 | 3199 | /* DD flags */ |
9985f83c | 3200 | pp = stream_get_endp (s); |
718e3744 | 3201 | stream_putc (s, nbr->dd_flags); |
3202 | ||
3203 | /* Set DD Sequence Number. */ | |
3204 | stream_putl (s, nbr->dd_seqnum); | |
3205 | ||
b5aeb441 | 3206 | /* shortcut unneeded walk of (empty) summary LSDBs */ |
718e3744 | 3207 | if (ospf_db_summary_isempty (nbr)) |
b5aeb441 | 3208 | goto empty; |
718e3744 | 3209 | |
3210 | /* Describe LSA Header from Database Summary List. */ | |
3211 | lsdb = &nbr->db_sum; | |
3212 | ||
3213 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
3214 | { | |
3215 | struct route_table *table = lsdb->type[i].db; | |
3216 | struct route_node *rn; | |
3217 | ||
3218 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
3219 | if ((lsa = rn->info) != NULL) | |
3220 | { | |
3221 | #ifdef HAVE_OPAQUE_LSA | |
3222 | if (IS_OPAQUE_LSA (lsa->data->type) | |
3223 | && (! CHECK_FLAG (options, OSPF_OPTION_O))) | |
3224 | { | |
3225 | /* Suppress advertising opaque-informations. */ | |
3226 | /* Remove LSA from DB summary list. */ | |
3227 | ospf_lsdb_delete (lsdb, lsa); | |
3228 | continue; | |
3229 | } | |
3230 | #endif /* HAVE_OPAQUE_LSA */ | |
3231 | ||
3232 | if (!CHECK_FLAG (lsa->flags, OSPF_LSA_DISCARD)) | |
3233 | { | |
3234 | struct lsa_header *lsah; | |
3235 | u_int16_t ls_age; | |
3236 | ||
3237 | /* DD packet overflows interface MTU. */ | |
86f1fd96 | 3238 | if (length + OSPF_LSA_HEADER_SIZE > ospf_packet_max (oi)) |
718e3744 | 3239 | break; |
3240 | ||
3241 | /* Keep pointer to LS age. */ | |
3242 | lsah = (struct lsa_header *) (STREAM_DATA (s) + | |
9985f83c | 3243 | stream_get_endp (s)); |
718e3744 | 3244 | |
3245 | /* Proceed stream pointer. */ | |
3246 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
3247 | length += OSPF_LSA_HEADER_SIZE; | |
3248 | ||
3249 | /* Set LS age. */ | |
3250 | ls_age = LS_AGE (lsa); | |
3251 | lsah->ls_age = htons (ls_age); | |
3252 | ||
3253 | } | |
3254 | ||
3255 | /* Remove LSA from DB summary list. */ | |
3256 | ospf_lsdb_delete (lsdb, lsa); | |
3257 | } | |
3258 | } | |
3259 | ||
8dd24ee6 PJ |
3260 | /* Update 'More' bit */ |
3261 | if (ospf_db_summary_isempty (nbr)) | |
3262 | { | |
b5aeb441 PJ |
3263 | empty: |
3264 | if (nbr->state >= NSM_Exchange) | |
3265 | { | |
3266 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_M); | |
3267 | /* Rewrite DD flags */ | |
3268 | stream_putc_at (s, pp, nbr->dd_flags); | |
3269 | } | |
3270 | else | |
3271 | { | |
3272 | assert (IS_SET_DD_M(nbr->dd_flags)); | |
3273 | } | |
8dd24ee6 | 3274 | } |
718e3744 | 3275 | return length; |
3276 | } | |
3277 | ||
4dadc291 | 3278 | static int |
718e3744 | 3279 | ospf_make_ls_req_func (struct stream *s, u_int16_t *length, |
3280 | unsigned long delta, struct ospf_neighbor *nbr, | |
3281 | struct ospf_lsa *lsa) | |
3282 | { | |
3283 | struct ospf_interface *oi; | |
3284 | ||
3285 | oi = nbr->oi; | |
3286 | ||
3287 | /* LS Request packet overflows interface MTU. */ | |
86f1fd96 | 3288 | if (*length + delta > ospf_packet_max(oi)) |
718e3744 | 3289 | return 0; |
3290 | ||
3291 | stream_putl (s, lsa->data->type); | |
3292 | stream_put_ipv4 (s, lsa->data->id.s_addr); | |
3293 | stream_put_ipv4 (s, lsa->data->adv_router.s_addr); | |
3294 | ||
1fe6ed38 | 3295 | ospf_lsa_unlock (&nbr->ls_req_last); |
718e3744 | 3296 | nbr->ls_req_last = ospf_lsa_lock (lsa); |
3297 | ||
3298 | *length += 12; | |
3299 | return 1; | |
3300 | } | |
3301 | ||
4dadc291 | 3302 | static int |
718e3744 | 3303 | ospf_make_ls_req (struct ospf_neighbor *nbr, struct stream *s) |
3304 | { | |
3305 | struct ospf_lsa *lsa; | |
3306 | u_int16_t length = OSPF_LS_REQ_MIN_SIZE; | |
9985f83c | 3307 | unsigned long delta = stream_get_endp(s)+12; |
718e3744 | 3308 | struct route_table *table; |
3309 | struct route_node *rn; | |
3310 | int i; | |
3311 | struct ospf_lsdb *lsdb; | |
3312 | ||
3313 | lsdb = &nbr->ls_req; | |
3314 | ||
3315 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
3316 | { | |
3317 | table = lsdb->type[i].db; | |
3318 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
3319 | if ((lsa = (rn->info)) != NULL) | |
3320 | if (ospf_make_ls_req_func (s, &length, delta, nbr, lsa) == 0) | |
3321 | { | |
3322 | route_unlock_node (rn); | |
3323 | break; | |
3324 | } | |
3325 | } | |
3326 | return length; | |
3327 | } | |
3328 | ||
4dadc291 | 3329 | static int |
718e3744 | 3330 | ls_age_increment (struct ospf_lsa *lsa, int delay) |
3331 | { | |
3332 | int age; | |
3333 | ||
3334 | age = IS_LSA_MAXAGE (lsa) ? OSPF_LSA_MAXAGE : LS_AGE (lsa) + delay; | |
3335 | ||
3336 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); | |
3337 | } | |
3338 | ||
4dadc291 | 3339 | static int |
52dc7ee6 | 3340 | ospf_make_ls_upd (struct ospf_interface *oi, struct list *update, struct stream *s) |
718e3744 | 3341 | { |
3342 | struct ospf_lsa *lsa; | |
52dc7ee6 | 3343 | struct listnode *node; |
c9035ccd | 3344 | u_int16_t length = 0; |
86f1fd96 | 3345 | unsigned int size_noauth; |
9985f83c | 3346 | unsigned long delta = stream_get_endp (s); |
718e3744 | 3347 | unsigned long pp; |
3348 | int count = 0; | |
3349 | ||
3350 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3351 | zlog_debug ("ospf_make_ls_upd: Start"); |
59ea14c6 | 3352 | |
9985f83c | 3353 | pp = stream_get_endp (s); |
3354 | stream_forward_endp (s, OSPF_LS_UPD_MIN_SIZE); | |
c9035ccd | 3355 | length += OSPF_LS_UPD_MIN_SIZE; |
718e3744 | 3356 | |
86f1fd96 | 3357 | /* Calculate amount of packet usable for data. */ |
3358 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
3359 | ||
718e3744 | 3360 | while ((node = listhead (update)) != NULL) |
3361 | { | |
3362 | struct lsa_header *lsah; | |
3363 | u_int16_t ls_age; | |
3364 | ||
3365 | if (IS_DEBUG_OSPF_EVENT) | |
d06ccd47 | 3366 | zlog_debug ("ospf_make_ls_upd: List Iteration %d", count); |
718e3744 | 3367 | |
1eb8ef25 | 3368 | lsa = listgetdata (node); |
3369 | ||
718e3744 | 3370 | assert (lsa->data); |
3371 | ||
68b7339a | 3372 | /* Will it fit? */ |
86f1fd96 | 3373 | if (length + delta + ntohs (lsa->data->length) > size_noauth) |
59ea14c6 | 3374 | break; |
3375 | ||
718e3744 | 3376 | /* Keep pointer to LS age. */ |
9985f83c | 3377 | lsah = (struct lsa_header *) (STREAM_DATA (s) + stream_get_endp (s)); |
718e3744 | 3378 | |
3379 | /* Put LSA to Link State Request. */ | |
3380 | stream_put (s, lsa->data, ntohs (lsa->data->length)); | |
3381 | ||
3382 | /* Set LS age. */ | |
3383 | /* each hop must increment an lsa_age by transmit_delay | |
3384 | of OSPF interface */ | |
3385 | ls_age = ls_age_increment (lsa, OSPF_IF_PARAM (oi, transmit_delay)); | |
3386 | lsah->ls_age = htons (ls_age); | |
3387 | ||
3388 | length += ntohs (lsa->data->length); | |
3389 | count++; | |
3390 | ||
3391 | list_delete_node (update, node); | |
1fe6ed38 | 3392 | ospf_lsa_unlock (&lsa); /* oi->ls_upd_queue */ |
718e3744 | 3393 | } |
3394 | ||
3395 | /* Now set #LSAs. */ | |
3a9eb091 | 3396 | stream_putl_at (s, pp, count); |
718e3744 | 3397 | |
3398 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3399 | zlog_debug ("ospf_make_ls_upd: Stop"); |
718e3744 | 3400 | return length; |
3401 | } | |
3402 | ||
4dadc291 | 3403 | static int |
52dc7ee6 | 3404 | ospf_make_ls_ack (struct ospf_interface *oi, struct list *ack, struct stream *s) |
718e3744 | 3405 | { |
1fe6ed38 | 3406 | struct listnode *node, *nnode; |
718e3744 | 3407 | u_int16_t length = OSPF_LS_ACK_MIN_SIZE; |
9985f83c | 3408 | unsigned long delta = stream_get_endp(s) + 24; |
718e3744 | 3409 | struct ospf_lsa *lsa; |
3410 | ||
1fe6ed38 | 3411 | for (ALL_LIST_ELEMENTS (ack, node, nnode, lsa)) |
718e3744 | 3412 | { |
718e3744 | 3413 | assert (lsa); |
3414 | ||
86f1fd96 | 3415 | if (length + delta > ospf_packet_max (oi)) |
718e3744 | 3416 | break; |
3417 | ||
3418 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
3419 | length += OSPF_LSA_HEADER_SIZE; | |
3420 | ||
718e3744 | 3421 | listnode_delete (ack, lsa); |
1fe6ed38 | 3422 | ospf_lsa_unlock (&lsa); /* oi->ls_ack_direct.ls_ack */ |
718e3744 | 3423 | } |
3424 | ||
718e3744 | 3425 | return length; |
3426 | } | |
3427 | ||
aa276fd7 PJ |
3428 | static void |
3429 | ospf_hello_send_sub (struct ospf_interface *oi, in_addr_t addr) | |
718e3744 | 3430 | { |
3431 | struct ospf_packet *op; | |
3432 | u_int16_t length = OSPF_HEADER_SIZE; | |
3433 | ||
3434 | op = ospf_packet_new (oi->ifp->mtu); | |
3435 | ||
3436 | /* Prepare OSPF common header. */ | |
3437 | ospf_make_header (OSPF_MSG_HELLO, oi, op->s); | |
3438 | ||
3439 | /* Prepare OSPF Hello body. */ | |
3440 | length += ospf_make_hello (oi, op->s); | |
3441 | ||
3442 | /* Fill OSPF header. */ | |
3443 | ospf_fill_header (oi, op->s, length); | |
3444 | ||
3445 | /* Set packet length. */ | |
3446 | op->length = length; | |
3447 | ||
aa276fd7 | 3448 | op->dst.s_addr = addr; |
718e3744 | 3449 | |
aa276fd7 PJ |
3450 | /* Add packet to the top of the interface output queue, so that they |
3451 | * can't get delayed by things like long queues of LS Update packets | |
3452 | */ | |
3453 | ospf_packet_add_top (oi, op); | |
718e3744 | 3454 | |
3455 | /* Hook thread to write packet. */ | |
020709f9 | 3456 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3457 | } |
3458 | ||
4dadc291 | 3459 | static void |
718e3744 | 3460 | ospf_poll_send (struct ospf_nbr_nbma *nbr_nbma) |
3461 | { | |
3462 | struct ospf_interface *oi; | |
3463 | ||
3464 | oi = nbr_nbma->oi; | |
3465 | assert(oi); | |
3466 | ||
3467 | /* If this is passive interface, do not send OSPF Hello. */ | |
7ffa8fa2 | 3468 | if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) |
718e3744 | 3469 | return; |
3470 | ||
3471 | if (oi->type != OSPF_IFTYPE_NBMA) | |
3472 | return; | |
3473 | ||
3474 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) | |
3475 | return; | |
3476 | ||
3477 | if (PRIORITY(oi) == 0) | |
3478 | return; | |
3479 | ||
3480 | if (nbr_nbma->priority == 0 | |
3481 | && oi->state != ISM_DR && oi->state != ISM_Backup) | |
3482 | return; | |
3483 | ||
aa276fd7 | 3484 | ospf_hello_send_sub (oi, nbr_nbma->addr.s_addr); |
718e3744 | 3485 | } |
3486 | ||
3487 | int | |
3488 | ospf_poll_timer (struct thread *thread) | |
3489 | { | |
3490 | struct ospf_nbr_nbma *nbr_nbma; | |
3491 | ||
3492 | nbr_nbma = THREAD_ARG (thread); | |
3493 | nbr_nbma->t_poll = NULL; | |
3494 | ||
3495 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3496 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Poll timer expire)", |
718e3744 | 3497 | IF_NAME (nbr_nbma->oi), inet_ntoa (nbr_nbma->addr)); |
3498 | ||
3499 | ospf_poll_send (nbr_nbma); | |
3500 | ||
3501 | if (nbr_nbma->v_poll > 0) | |
3502 | OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, | |
3503 | nbr_nbma->v_poll); | |
3504 | ||
3505 | return 0; | |
3506 | } | |
3507 | ||
3508 | ||
3509 | int | |
3510 | ospf_hello_reply_timer (struct thread *thread) | |
3511 | { | |
3512 | struct ospf_neighbor *nbr; | |
3513 | ||
3514 | nbr = THREAD_ARG (thread); | |
3515 | nbr->t_hello_reply = NULL; | |
3516 | ||
3517 | assert (nbr->oi); | |
3518 | ||
3519 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3520 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (hello-reply timer expire)", |
718e3744 | 3521 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); |
3522 | ||
aa276fd7 | 3523 | ospf_hello_send_sub (nbr->oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3524 | |
3525 | return 0; | |
3526 | } | |
3527 | ||
3528 | /* Send OSPF Hello. */ | |
3529 | void | |
3530 | ospf_hello_send (struct ospf_interface *oi) | |
3531 | { | |
718e3744 | 3532 | /* If this is passive interface, do not send OSPF Hello. */ |
7ffa8fa2 | 3533 | if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) |
718e3744 | 3534 | return; |
3535 | ||
718e3744 | 3536 | if (oi->type == OSPF_IFTYPE_NBMA) |
3537 | { | |
3538 | struct ospf_neighbor *nbr; | |
3539 | struct route_node *rn; | |
3540 | ||
3541 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3542 | if ((nbr = rn->info)) | |
3543 | if (nbr != oi->nbr_self) | |
3544 | if (nbr->state != NSM_Down) | |
3545 | { | |
3546 | /* RFC 2328 Section 9.5.1 | |
3547 | If the router is not eligible to become Designated Router, | |
3548 | it must periodically send Hello Packets to both the | |
3549 | Designated Router and the Backup Designated Router (if they | |
3550 | exist). */ | |
3551 | if (PRIORITY(oi) == 0 && | |
3552 | IPV4_ADDR_CMP(&DR(oi), &nbr->address.u.prefix4) && | |
3553 | IPV4_ADDR_CMP(&BDR(oi), &nbr->address.u.prefix4)) | |
3554 | continue; | |
3555 | ||
3556 | /* If the router is eligible to become Designated Router, it | |
3557 | must periodically send Hello Packets to all neighbors that | |
3558 | are also eligible. In addition, if the router is itself the | |
3559 | Designated Router or Backup Designated Router, it must also | |
3560 | send periodic Hello Packets to all other neighbors. */ | |
3561 | ||
3562 | if (nbr->priority == 0 && oi->state == ISM_DROther) | |
3563 | continue; | |
3564 | /* if oi->state == Waiting, send hello to all neighbors */ | |
aa276fd7 | 3565 | ospf_hello_send_sub (oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3566 | } |
718e3744 | 3567 | } |
3568 | else | |
3569 | { | |
3570 | /* Decide destination address. */ | |
3571 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
aa276fd7 PJ |
3572 | ospf_hello_send_sub (oi, oi->vl_data->peer_addr.s_addr); |
3573 | else | |
3574 | ospf_hello_send_sub (oi, htonl (OSPF_ALLSPFROUTERS)); | |
718e3744 | 3575 | } |
3576 | } | |
3577 | ||
3578 | /* Send OSPF Database Description. */ | |
3579 | void | |
3580 | ospf_db_desc_send (struct ospf_neighbor *nbr) | |
3581 | { | |
3582 | struct ospf_interface *oi; | |
3583 | struct ospf_packet *op; | |
3584 | u_int16_t length = OSPF_HEADER_SIZE; | |
3585 | ||
3586 | oi = nbr->oi; | |
3587 | op = ospf_packet_new (oi->ifp->mtu); | |
3588 | ||
3589 | /* Prepare OSPF common header. */ | |
3590 | ospf_make_header (OSPF_MSG_DB_DESC, oi, op->s); | |
3591 | ||
3592 | /* Prepare OSPF Database Description body. */ | |
3593 | length += ospf_make_db_desc (oi, nbr, op->s); | |
3594 | ||
3595 | /* Fill OSPF header. */ | |
3596 | ospf_fill_header (oi, op->s, length); | |
3597 | ||
3598 | /* Set packet length. */ | |
3599 | op->length = length; | |
3600 | ||
3601 | /* Decide destination address. */ | |
53d0dece JT |
3602 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3603 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3604 | else | |
3605 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3606 | |
3607 | /* Add packet to the interface output queue. */ | |
3608 | ospf_packet_add (oi, op); | |
3609 | ||
3610 | /* Hook thread to write packet. */ | |
020709f9 | 3611 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3612 | |
3613 | /* Remove old DD packet, then copy new one and keep in neighbor structure. */ | |
3614 | if (nbr->last_send) | |
3615 | ospf_packet_free (nbr->last_send); | |
3616 | nbr->last_send = ospf_packet_dup (op); | |
2518efd1 | 3617 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &nbr->last_send_ts); |
718e3744 | 3618 | } |
3619 | ||
3620 | /* Re-send Database Description. */ | |
3621 | void | |
3622 | ospf_db_desc_resend (struct ospf_neighbor *nbr) | |
3623 | { | |
3624 | struct ospf_interface *oi; | |
3625 | ||
3626 | oi = nbr->oi; | |
3627 | ||
3628 | /* Add packet to the interface output queue. */ | |
3629 | ospf_packet_add (oi, ospf_packet_dup (nbr->last_send)); | |
3630 | ||
3631 | /* Hook thread to write packet. */ | |
020709f9 | 3632 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3633 | } |
3634 | ||
3635 | /* Send Link State Request. */ | |
3636 | void | |
3637 | ospf_ls_req_send (struct ospf_neighbor *nbr) | |
3638 | { | |
3639 | struct ospf_interface *oi; | |
3640 | struct ospf_packet *op; | |
3641 | u_int16_t length = OSPF_HEADER_SIZE; | |
3642 | ||
3643 | oi = nbr->oi; | |
3644 | op = ospf_packet_new (oi->ifp->mtu); | |
3645 | ||
3646 | /* Prepare OSPF common header. */ | |
3647 | ospf_make_header (OSPF_MSG_LS_REQ, oi, op->s); | |
3648 | ||
3649 | /* Prepare OSPF Link State Request body. */ | |
3650 | length += ospf_make_ls_req (nbr, op->s); | |
3651 | if (length == OSPF_HEADER_SIZE) | |
3652 | { | |
3653 | ospf_packet_free (op); | |
3654 | return; | |
3655 | } | |
3656 | ||
3657 | /* Fill OSPF header. */ | |
3658 | ospf_fill_header (oi, op->s, length); | |
3659 | ||
3660 | /* Set packet length. */ | |
3661 | op->length = length; | |
3662 | ||
3663 | /* Decide destination address. */ | |
53d0dece JT |
3664 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3665 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3666 | else | |
3667 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3668 | |
3669 | /* Add packet to the interface output queue. */ | |
3670 | ospf_packet_add (oi, op); | |
3671 | ||
3672 | /* Hook thread to write packet. */ | |
020709f9 | 3673 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3674 | |
3675 | /* Add Link State Request Retransmission Timer. */ | |
3676 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
3677 | } | |
3678 | ||
3679 | /* Send Link State Update with an LSA. */ | |
3680 | void | |
3681 | ospf_ls_upd_send_lsa (struct ospf_neighbor *nbr, struct ospf_lsa *lsa, | |
3682 | int flag) | |
3683 | { | |
52dc7ee6 | 3684 | struct list *update; |
718e3744 | 3685 | |
3686 | update = list_new (); | |
3687 | ||
3688 | listnode_add (update, lsa); | |
3689 | ospf_ls_upd_send (nbr, update, flag); | |
3690 | ||
3691 | list_delete (update); | |
3692 | } | |
3693 | ||
68b7339a | 3694 | /* Determine size for packet. Must be at least big enough to accomodate next |
3695 | * LSA on list, which may be bigger than MTU size. | |
3696 | * | |
3697 | * Return pointer to new ospf_packet | |
3698 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3699 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3700 | */ | |
3701 | static struct ospf_packet * | |
3702 | ospf_ls_upd_packet_new (struct list *update, struct ospf_interface *oi) | |
3703 | { | |
3704 | struct ospf_lsa *lsa; | |
3705 | struct listnode *ln; | |
3706 | size_t size; | |
3707 | static char warned = 0; | |
3708 | ||
1eb8ef25 | 3709 | lsa = listgetdata((ln = listhead (update))); |
68b7339a | 3710 | assert (lsa->data); |
3711 | ||
3712 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs (lsa->data->length)) | |
3713 | > ospf_packet_max (oi)) | |
3714 | { | |
3715 | if (!warned) | |
3716 | { | |
3717 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA encountered!" | |
3718 | "will need to fragment. Not optimal. Try divide up" | |
3719 | " your network with areas. Use 'debug ospf packet send'" | |
3720 | " to see details, or look at 'show ip ospf database ..'"); | |
3721 | warned = 1; | |
3722 | } | |
3723 | ||
3724 | if (IS_DEBUG_OSPF_PACKET (0, SEND)) | |
2a42e285 | 3725 | zlog_debug ("ospf_ls_upd_packet_new: oversized LSA id:%s," |
68b7339a | 3726 | " %d bytes originated by %s, will be fragmented!", |
3727 | inet_ntoa (lsa->data->id), | |
3728 | ntohs (lsa->data->length), | |
3729 | inet_ntoa (lsa->data->adv_router)); | |
3730 | ||
3731 | /* | |
3732 | * Allocate just enough to fit this LSA only, to avoid including other | |
3733 | * LSAs in fragmented LSA Updates. | |
3734 | */ | |
3735 | size = ntohs (lsa->data->length) + (oi->ifp->mtu - ospf_packet_max (oi)) | |
3736 | + OSPF_LS_UPD_MIN_SIZE; | |
3737 | } | |
3738 | else | |
3739 | size = oi->ifp->mtu; | |
3740 | ||
3741 | if (size > OSPF_MAX_PACKET_SIZE) | |
3742 | { | |
3743 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA id:%s too big," | |
64511f39 | 3744 | " %d bytes, packet size %ld, dropping it completely." |
68b7339a | 3745 | " OSPF routing is broken!", |
37ccfa3d | 3746 | inet_ntoa (lsa->data->id), ntohs (lsa->data->length), |
62d8e96a | 3747 | (long int) size); |
68b7339a | 3748 | list_delete_node (update, ln); |
3749 | return NULL; | |
3750 | } | |
3751 | ||
c9035ccd DT |
3752 | /* IP header is built up separately by ospf_write(). This means, that we must |
3753 | * reduce the "affordable" size just calculated by length of an IP header. | |
3754 | * This makes sure, that even if we manage to fill the payload with LSA data | |
3755 | * completely, the final packet (our data plus IP header) still fits into | |
3756 | * outgoing interface MTU. This correction isn't really meaningful for an | |
3757 | * oversized LSA, but for consistency the correction is done for both cases. | |
3758 | * | |
3759 | * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size | |
3760 | */ | |
3761 | return ospf_packet_new (size - sizeof (struct ip)); | |
68b7339a | 3762 | } |
3763 | ||
718e3744 | 3764 | static void |
52dc7ee6 | 3765 | ospf_ls_upd_queue_send (struct ospf_interface *oi, struct list *update, |
718e3744 | 3766 | struct in_addr addr) |
3767 | { | |
3768 | struct ospf_packet *op; | |
3769 | u_int16_t length = OSPF_HEADER_SIZE; | |
3770 | ||
3771 | if (IS_DEBUG_OSPF_EVENT) | |
d06ccd47 DS |
3772 | zlog_debug ("listcount = %d, [%s]dst %s", listcount (update), IF_NAME(oi), |
3773 | inet_ntoa(addr)); | |
68b7339a | 3774 | |
3775 | op = ospf_ls_upd_packet_new (update, oi); | |
718e3744 | 3776 | |
3777 | /* Prepare OSPF common header. */ | |
3778 | ospf_make_header (OSPF_MSG_LS_UPD, oi, op->s); | |
3779 | ||
59ea14c6 | 3780 | /* Prepare OSPF Link State Update body. |
3781 | * Includes Type-7 translation. | |
3782 | */ | |
718e3744 | 3783 | length += ospf_make_ls_upd (oi, update, op->s); |
3784 | ||
3785 | /* Fill OSPF header. */ | |
3786 | ospf_fill_header (oi, op->s, length); | |
3787 | ||
3788 | /* Set packet length. */ | |
3789 | op->length = length; | |
3790 | ||
3791 | /* Decide destination address. */ | |
53d0dece JT |
3792 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3793 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3794 | else | |
3795 | op->dst.s_addr = addr.s_addr; | |
718e3744 | 3796 | |
3797 | /* Add packet to the interface output queue. */ | |
3798 | ospf_packet_add (oi, op); | |
3799 | ||
3800 | /* Hook thread to write packet. */ | |
020709f9 | 3801 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3802 | } |
3803 | ||
3804 | static int | |
3805 | ospf_ls_upd_send_queue_event (struct thread *thread) | |
3806 | { | |
3807 | struct ospf_interface *oi = THREAD_ARG(thread); | |
3808 | struct route_node *rn; | |
736d3441 | 3809 | struct route_node *rnext; |
59ea14c6 | 3810 | struct list *update; |
68b7339a | 3811 | char again = 0; |
718e3744 | 3812 | |
3813 | oi->t_ls_upd_event = NULL; | |
3814 | ||
3815 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3816 | zlog_debug ("ospf_ls_upd_send_queue start"); |
718e3744 | 3817 | |
736d3441 | 3818 | for (rn = route_top (oi->ls_upd_queue); rn; rn = rnext) |
718e3744 | 3819 | { |
736d3441 | 3820 | rnext = route_next (rn); |
3821 | ||
718e3744 | 3822 | if (rn->info == NULL) |
736d3441 | 3823 | continue; |
68b7339a | 3824 | |
3825 | update = (struct list *)rn->info; | |
718e3744 | 3826 | |
48fe13bf | 3827 | ospf_ls_upd_queue_send (oi, update, rn->p.u.prefix4); |
718e3744 | 3828 | |
68b7339a | 3829 | /* list might not be empty. */ |
59ea14c6 | 3830 | if (listcount(update) == 0) |
3831 | { | |
3832 | list_delete (rn->info); | |
3833 | rn->info = NULL; | |
3834 | route_unlock_node (rn); | |
3835 | } | |
3836 | else | |
68b7339a | 3837 | again = 1; |
59ea14c6 | 3838 | } |
3839 | ||
3840 | if (again != 0) | |
3841 | { | |
3842 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3843 | zlog_debug ("ospf_ls_upd_send_queue: update lists not cleared," |
59ea14c6 | 3844 | " %d nodes to try again, raising new event", again); |
3845 | oi->t_ls_upd_event = | |
3846 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
718e3744 | 3847 | } |
3848 | ||
3849 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3850 | zlog_debug ("ospf_ls_upd_send_queue stop"); |
59ea14c6 | 3851 | |
718e3744 | 3852 | return 0; |
3853 | } | |
3854 | ||
3855 | void | |
52dc7ee6 | 3856 | ospf_ls_upd_send (struct ospf_neighbor *nbr, struct list *update, int flag) |
718e3744 | 3857 | { |
3858 | struct ospf_interface *oi; | |
1eb8ef25 | 3859 | struct ospf_lsa *lsa; |
718e3744 | 3860 | struct prefix_ipv4 p; |
3861 | struct route_node *rn; | |
1eb8ef25 | 3862 | struct listnode *node; |
718e3744 | 3863 | |
3864 | oi = nbr->oi; | |
3865 | ||
3866 | p.family = AF_INET; | |
3867 | p.prefixlen = IPV4_MAX_BITLEN; | |
3868 | ||
3869 | /* Decide destination address. */ | |
3870 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3871 | p.prefix = oi->vl_data->peer_addr; | |
53d0dece JT |
3872 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3873 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3874 | else if (flag == OSPF_SEND_PACKET_DIRECT) |
3875 | p.prefix = nbr->address.u.prefix4; | |
3876 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3877 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
7afa08da | 3878 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3879 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3880 | else |
3881 | p.prefix.s_addr = htonl (OSPF_ALLDROUTERS); | |
3882 | ||
3883 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3884 | { | |
3885 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
3886 | zlog_warn ("* LS-Update is directly sent on NBMA network."); | |
3887 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix.s_addr)) | |
3888 | zlog_warn ("* LS-Update is sent to myself."); | |
3889 | } | |
3890 | ||
3891 | rn = route_node_get (oi->ls_upd_queue, (struct prefix *) &p); | |
3892 | ||
3893 | if (rn->info == NULL) | |
3894 | rn->info = list_new (); | |
3895 | ||
1eb8ef25 | 3896 | for (ALL_LIST_ELEMENTS_RO (update, node, lsa)) |
1fe6ed38 | 3897 | listnode_add (rn->info, ospf_lsa_lock (lsa)); /* oi->ls_upd_queue */ |
718e3744 | 3898 | |
3899 | if (oi->t_ls_upd_event == NULL) | |
3900 | oi->t_ls_upd_event = | |
3901 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
3902 | } | |
3903 | ||
3904 | static void | |
52dc7ee6 | 3905 | ospf_ls_ack_send_list (struct ospf_interface *oi, struct list *ack, |
3906 | struct in_addr dst) | |
718e3744 | 3907 | { |
3908 | struct ospf_packet *op; | |
3909 | u_int16_t length = OSPF_HEADER_SIZE; | |
3910 | ||
3911 | op = ospf_packet_new (oi->ifp->mtu); | |
3912 | ||
3913 | /* Prepare OSPF common header. */ | |
3914 | ospf_make_header (OSPF_MSG_LS_ACK, oi, op->s); | |
3915 | ||
3916 | /* Prepare OSPF Link State Acknowledgment body. */ | |
3917 | length += ospf_make_ls_ack (oi, ack, op->s); | |
3918 | ||
3919 | /* Fill OSPF header. */ | |
3920 | ospf_fill_header (oi, op->s, length); | |
3921 | ||
3922 | /* Set packet length. */ | |
3923 | op->length = length; | |
3924 | ||
86bede75 DS |
3925 | /* Decide destination address. */ |
3926 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3927 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3928 | else | |
3929 | op->dst.s_addr = dst.s_addr; | |
3930 | ||
718e3744 | 3931 | /* Add packet to the interface output queue. */ |
3932 | ospf_packet_add (oi, op); | |
3933 | ||
3934 | /* Hook thread to write packet. */ | |
020709f9 | 3935 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3936 | } |
3937 | ||
3938 | static int | |
3939 | ospf_ls_ack_send_event (struct thread *thread) | |
3940 | { | |
3941 | struct ospf_interface *oi = THREAD_ARG (thread); | |
3942 | ||
3943 | oi->t_ls_ack_direct = NULL; | |
3944 | ||
3945 | while (listcount (oi->ls_ack_direct.ls_ack)) | |
3946 | ospf_ls_ack_send_list (oi, oi->ls_ack_direct.ls_ack, | |
3947 | oi->ls_ack_direct.dst); | |
3948 | ||
3949 | return 0; | |
3950 | } | |
3951 | ||
3952 | void | |
3953 | ospf_ls_ack_send (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
3954 | { | |
3955 | struct ospf_interface *oi = nbr->oi; | |
3956 | ||
3957 | if (listcount (oi->ls_ack_direct.ls_ack) == 0) | |
3958 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
3959 | ||
3960 | listnode_add (oi->ls_ack_direct.ls_ack, ospf_lsa_lock (lsa)); | |
3961 | ||
3962 | if (oi->t_ls_ack_direct == NULL) | |
3963 | oi->t_ls_ack_direct = | |
3964 | thread_add_event (master, ospf_ls_ack_send_event, oi, 0); | |
3965 | } | |
3966 | ||
3967 | /* Send Link State Acknowledgment delayed. */ | |
3968 | void | |
3969 | ospf_ls_ack_send_delayed (struct ospf_interface *oi) | |
3970 | { | |
3971 | struct in_addr dst; | |
3972 | ||
3973 | /* Decide destination address. */ | |
3974 | /* RFC2328 Section 13.5 On non-broadcast | |
3975 | networks, delayed Link State Acknowledgment packets must be | |
3976 | unicast separately over each adjacency (i.e., neighbor whose | |
3977 | state is >= Exchange). */ | |
3978 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3979 | { | |
3980 | struct ospf_neighbor *nbr; | |
3981 | struct route_node *rn; | |
3982 | ||
3983 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3984 | if ((nbr = rn->info) != NULL) | |
3985 | if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange) | |
3986 | while (listcount (oi->ls_ack)) | |
3987 | ospf_ls_ack_send_list (oi, oi->ls_ack, nbr->address.u.prefix4); | |
3988 | return; | |
3989 | } | |
3990 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3991 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
3992 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3993 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3994 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3995 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
630e4807 | 3996 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3997 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3998 | else |
3999 | dst.s_addr = htonl (OSPF_ALLDROUTERS); | |
4000 | ||
4001 | while (listcount (oi->ls_ack)) | |
4002 | ospf_ls_ack_send_list (oi, oi->ls_ack, dst); | |
4003 | } | |
8b6912c2 DS |
4004 | |
4005 | /* | |
4006 | * On pt-to-pt links, all OSPF control packets are sent to the multicast | |
4007 | * address. As a result, the kernel does not need to learn the interface | |
4008 | * MAC of the OSPF neighbor. However, in our world, this will delay | |
4009 | * convergence. Take the case when due to a link flap, all routes now | |
4010 | * want to use an interface which was deemed to be costlier prior to this | |
4011 | * event. For routes that will be installed, the missing MAC will have | |
4012 | * punt-to-CPU set on them. This may overload the CPU control path that | |
4013 | * can be avoided if the MAC was known apriori. | |
4014 | */ | |
4015 | #define OSPF_PING_NBR_STR_MAX (8 + 40 + 20) | |
4016 | void | |
4017 | ospf_proactively_arp (struct ospf_neighbor *nbr) | |
4018 | { | |
4019 | char ping_nbr[OSPF_PING_NBR_STR_MAX]; | |
4020 | char *str_ptr; | |
4021 | int ret; | |
4022 | ||
4023 | if (!nbr || !nbr->oi || !nbr->oi->ifp || !nbr->oi->ifp->name) | |
4024 | return; | |
4025 | ||
4026 | str_ptr = strcpy (ping_nbr, "ping -c 1 -I "); | |
4027 | str_ptr = strcat (str_ptr, nbr->oi->ifp->name); | |
4028 | str_ptr = strcat (str_ptr, " "); | |
4029 | str_ptr = strcat (str_ptr, inet_ntoa (nbr->address.u.prefix4)); | |
4030 | str_ptr = strcat (str_ptr, " > /dev/null 2>&1 &"); | |
4031 | ret = system (ping_nbr); | |
4032 | if (IS_DEBUG_OSPF_EVENT) | |
4033 | zlog_debug ("Executed %s %s", ping_nbr, | |
4034 | ((ret == 0) ? "successfully" : "but failed")); | |
4035 | } |