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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. */ |
eb1ce605 | 53 | const char *ospf_packet_type_str[] = |
718e3744 | 54 | { |
55 | "unknown", | |
56 | "Hello", | |
57 | "Database Description", | |
58 | "Link State Request", | |
59 | "Link State Update", | |
60 | "Link State Acknowledgment", | |
61 | }; | |
62 | ||
718e3744 | 63 | /* OSPF authentication checking function */ |
4dadc291 | 64 | static int |
718e3744 | 65 | ospf_auth_type (struct ospf_interface *oi) |
66 | { | |
67 | int auth_type; | |
68 | ||
69 | if (OSPF_IF_PARAM (oi, auth_type) == OSPF_AUTH_NOTSET) | |
70 | auth_type = oi->area->auth_type; | |
71 | else | |
72 | auth_type = OSPF_IF_PARAM (oi, auth_type); | |
73 | ||
74 | /* Handle case where MD5 key list is not configured aka Cisco */ | |
75 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC && | |
76 | list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
77 | return OSPF_AUTH_NULL; | |
78 | ||
79 | return auth_type; | |
80 | ||
81 | } | |
82 | ||
718e3744 | 83 | struct ospf_packet * |
84 | ospf_packet_new (size_t size) | |
85 | { | |
86 | struct ospf_packet *new; | |
87 | ||
88 | new = XCALLOC (MTYPE_OSPF_PACKET, sizeof (struct ospf_packet)); | |
89 | new->s = stream_new (size); | |
90 | ||
91 | return new; | |
92 | } | |
93 | ||
94 | void | |
95 | ospf_packet_free (struct ospf_packet *op) | |
96 | { | |
97 | if (op->s) | |
98 | stream_free (op->s); | |
99 | ||
100 | XFREE (MTYPE_OSPF_PACKET, op); | |
101 | ||
102 | op = NULL; | |
103 | } | |
104 | ||
105 | struct ospf_fifo * | |
106 | ospf_fifo_new () | |
107 | { | |
108 | struct ospf_fifo *new; | |
109 | ||
110 | new = XCALLOC (MTYPE_OSPF_FIFO, sizeof (struct ospf_fifo)); | |
111 | return new; | |
112 | } | |
113 | ||
114 | /* Add new packet to fifo. */ | |
115 | void | |
116 | ospf_fifo_push (struct ospf_fifo *fifo, struct ospf_packet *op) | |
117 | { | |
118 | if (fifo->tail) | |
119 | fifo->tail->next = op; | |
120 | else | |
121 | fifo->head = op; | |
122 | ||
123 | fifo->tail = op; | |
124 | ||
125 | fifo->count++; | |
126 | } | |
127 | ||
128 | /* Delete first packet from fifo. */ | |
129 | struct ospf_packet * | |
130 | ospf_fifo_pop (struct ospf_fifo *fifo) | |
131 | { | |
132 | struct ospf_packet *op; | |
133 | ||
134 | op = fifo->head; | |
135 | ||
136 | if (op) | |
137 | { | |
138 | fifo->head = op->next; | |
139 | ||
140 | if (fifo->head == NULL) | |
141 | fifo->tail = NULL; | |
142 | ||
143 | fifo->count--; | |
144 | } | |
145 | ||
146 | return op; | |
147 | } | |
148 | ||
149 | /* Return first fifo entry. */ | |
150 | struct ospf_packet * | |
151 | ospf_fifo_head (struct ospf_fifo *fifo) | |
152 | { | |
153 | return fifo->head; | |
154 | } | |
155 | ||
156 | /* Flush ospf packet fifo. */ | |
157 | void | |
158 | ospf_fifo_flush (struct ospf_fifo *fifo) | |
159 | { | |
160 | struct ospf_packet *op; | |
161 | struct ospf_packet *next; | |
162 | ||
163 | for (op = fifo->head; op; op = next) | |
164 | { | |
165 | next = op->next; | |
166 | ospf_packet_free (op); | |
167 | } | |
168 | fifo->head = fifo->tail = NULL; | |
169 | fifo->count = 0; | |
170 | } | |
171 | ||
172 | /* Free ospf packet fifo. */ | |
173 | void | |
174 | ospf_fifo_free (struct ospf_fifo *fifo) | |
175 | { | |
176 | ospf_fifo_flush (fifo); | |
177 | ||
178 | XFREE (MTYPE_OSPF_FIFO, fifo); | |
179 | } | |
180 | ||
181 | void | |
182 | ospf_packet_add (struct ospf_interface *oi, struct ospf_packet *op) | |
183 | { | |
c3eab871 | 184 | if (!oi->obuf) |
185 | { | |
186 | zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
187 | "destination %s) called with NULL obuf, ignoring " | |
188 | "(please report this bug)!\n", | |
189 | IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state), | |
190 | ospf_packet_type_str[stream_getc_from(op->s, 1)], | |
191 | inet_ntoa (op->dst)); | |
192 | return; | |
193 | } | |
194 | ||
718e3744 | 195 | /* Add packet to end of queue. */ |
196 | ospf_fifo_push (oi->obuf, op); | |
197 | ||
198 | /* Debug of packet fifo*/ | |
199 | /* ospf_fifo_debug (oi->obuf); */ | |
200 | } | |
201 | ||
202 | void | |
203 | ospf_packet_delete (struct ospf_interface *oi) | |
204 | { | |
205 | struct ospf_packet *op; | |
206 | ||
207 | op = ospf_fifo_pop (oi->obuf); | |
208 | ||
209 | if (op) | |
210 | ospf_packet_free (op); | |
211 | } | |
212 | ||
718e3744 | 213 | struct ospf_packet * |
214 | ospf_packet_dup (struct ospf_packet *op) | |
215 | { | |
216 | struct ospf_packet *new; | |
217 | ||
37163d6d | 218 | if (stream_get_endp(op->s) != op->length) |
08c83671 AS |
219 | /* XXX size_t */ |
220 | zlog_warn ("ospf_packet_dup stream %lu ospf_packet %u size mismatch", | |
221 | (u_long)STREAM_SIZE(op->s), op->length); | |
30961a15 | 222 | |
223 | /* Reserve space for MD5 authentication that may be added later. */ | |
224 | new = ospf_packet_new (stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
fa81b713 | 225 | stream_copy (new->s, op->s); |
718e3744 | 226 | |
227 | new->dst = op->dst; | |
228 | new->length = op->length; | |
229 | ||
230 | return new; | |
231 | } | |
232 | ||
86f1fd96 | 233 | /* XXX inline */ |
4dadc291 | 234 | static inline unsigned int |
86f1fd96 | 235 | ospf_packet_authspace (struct ospf_interface *oi) |
236 | { | |
237 | int auth = 0; | |
238 | ||
239 | if ( ospf_auth_type (oi) == OSPF_AUTH_CRYPTOGRAPHIC) | |
240 | auth = OSPF_AUTH_MD5_SIZE; | |
241 | ||
242 | return auth; | |
243 | } | |
244 | ||
4dadc291 | 245 | static unsigned int |
718e3744 | 246 | ospf_packet_max (struct ospf_interface *oi) |
247 | { | |
248 | int max; | |
249 | ||
86f1fd96 | 250 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
251 | ||
68b7339a | 252 | max -= (OSPF_HEADER_SIZE + sizeof (struct ip)); |
718e3744 | 253 | |
254 | return max; | |
255 | } | |
256 | ||
257 | \f | |
4dadc291 | 258 | static int |
718e3744 | 259 | ospf_check_md5_digest (struct ospf_interface *oi, struct stream *s, |
260 | u_int16_t length) | |
261 | { | |
6c835671 | 262 | unsigned char *ibuf; |
c1a03d47 | 263 | MD5_CTX ctx; |
718e3744 | 264 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; |
265 | unsigned char *pdigest; | |
266 | struct crypt_key *ck; | |
267 | struct ospf_header *ospfh; | |
268 | struct ospf_neighbor *nbr; | |
269 | ||
270 | ||
271 | ibuf = STREAM_PNT (s); | |
272 | ospfh = (struct ospf_header *) ibuf; | |
273 | ||
274 | /* Get pointer to the end of the packet. */ | |
275 | pdigest = ibuf + length; | |
276 | ||
277 | /* Get secret key. */ | |
278 | ck = ospf_crypt_key_lookup (OSPF_IF_PARAM (oi, auth_crypt), | |
279 | ospfh->u.crypt.key_id); | |
280 | if (ck == NULL) | |
281 | { | |
282 | zlog_warn ("interface %s: ospf_check_md5 no key %d", | |
283 | IF_NAME (oi), ospfh->u.crypt.key_id); | |
284 | return 0; | |
285 | } | |
286 | ||
287 | /* check crypto seqnum. */ | |
288 | nbr = ospf_nbr_lookup_by_routerid (oi->nbrs, &ospfh->router_id); | |
289 | ||
290 | if (nbr && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) | |
291 | { | |
292 | zlog_warn ("interface %s: ospf_check_md5 bad sequence %d (expect %d)", | |
293 | IF_NAME (oi), | |
294 | ntohl(ospfh->u.crypt.crypt_seqnum), | |
295 | ntohl(nbr->crypt_seqnum)); | |
296 | return 0; | |
297 | } | |
298 | ||
299 | /* Generate a digest for the ospf packet - their digest + our digest. */ | |
c1a03d47 | 300 | memset(&ctx, 0, sizeof(ctx)); |
301 | MD5Init(&ctx); | |
302 | MD5Update(&ctx, ibuf, length); | |
303 | MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); | |
304 | MD5Final(digest, &ctx); | |
718e3744 | 305 | |
306 | /* compare the two */ | |
307 | if (memcmp (pdigest, digest, OSPF_AUTH_MD5_SIZE)) | |
308 | { | |
309 | zlog_warn ("interface %s: ospf_check_md5 checksum mismatch", | |
310 | IF_NAME (oi)); | |
311 | return 0; | |
312 | } | |
313 | ||
314 | /* save neighbor's crypt_seqnum */ | |
315 | if (nbr) | |
316 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
317 | return 1; | |
318 | } | |
319 | ||
320 | /* This function is called from ospf_write(), it will detect the | |
321 | authentication scheme and if it is MD5, it will change the sequence | |
322 | and update the MD5 digest. */ | |
4dadc291 | 323 | static int |
718e3744 | 324 | ospf_make_md5_digest (struct ospf_interface *oi, struct ospf_packet *op) |
325 | { | |
326 | struct ospf_header *ospfh; | |
327 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; | |
c1a03d47 | 328 | MD5_CTX ctx; |
718e3744 | 329 | void *ibuf; |
9483e155 | 330 | u_int32_t t; |
718e3744 | 331 | struct crypt_key *ck; |
3623814a | 332 | const u_int8_t *auth_key; |
718e3744 | 333 | |
334 | ibuf = STREAM_DATA (op->s); | |
335 | ospfh = (struct ospf_header *) ibuf; | |
336 | ||
337 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
338 | return 0; | |
339 | ||
340 | /* We do this here so when we dup a packet, we don't have to | |
2518efd1 PJ |
341 | waste CPU rewriting other headers. |
342 | ||
343 | Note that quagga_time /deliberately/ is not used here */ | |
9483e155 | 344 | t = (time(NULL) & 0xFFFFFFFF); |
818e56cf | 345 | if (t > oi->crypt_seqnum) |
346 | oi->crypt_seqnum = t; | |
347 | else | |
348 | oi->crypt_seqnum++; | |
349 | ||
9483e155 | 350 | ospfh->u.crypt.crypt_seqnum = htonl (oi->crypt_seqnum); |
718e3744 | 351 | |
352 | /* Get MD5 Authentication key from auth_key list. */ | |
353 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
3623814a | 354 | auth_key = (const u_int8_t *) ""; |
718e3744 | 355 | else |
356 | { | |
1eb8ef25 | 357 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
4dadc291 | 358 | auth_key = ck->auth_key; |
718e3744 | 359 | } |
360 | ||
361 | /* Generate a digest for the entire packet + our secret key. */ | |
c1a03d47 | 362 | memset(&ctx, 0, sizeof(ctx)); |
363 | MD5Init(&ctx); | |
364 | MD5Update(&ctx, ibuf, ntohs (ospfh->length)); | |
365 | MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
366 | MD5Final(digest, &ctx); | |
718e3744 | 367 | |
368 | /* Append md5 digest to the end of the stream. */ | |
718e3744 | 369 | stream_put (op->s, digest, OSPF_AUTH_MD5_SIZE); |
718e3744 | 370 | |
371 | /* We do *NOT* increment the OSPF header length. */ | |
30961a15 | 372 | op->length = ntohs (ospfh->length) + OSPF_AUTH_MD5_SIZE; |
373 | ||
37163d6d | 374 | if (stream_get_endp(op->s) != op->length) |
08c83671 AS |
375 | /* XXX size_t */ |
376 | zlog_warn("ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u", | |
377 | (u_long)stream_get_endp(op->s), op->length); | |
718e3744 | 378 | |
379 | return OSPF_AUTH_MD5_SIZE; | |
380 | } | |
381 | ||
382 | \f | |
4dadc291 | 383 | static int |
718e3744 | 384 | ospf_ls_req_timer (struct thread *thread) |
385 | { | |
386 | struct ospf_neighbor *nbr; | |
387 | ||
388 | nbr = THREAD_ARG (thread); | |
389 | nbr->t_ls_req = NULL; | |
390 | ||
391 | /* Send Link State Request. */ | |
392 | if (ospf_ls_request_count (nbr)) | |
393 | ospf_ls_req_send (nbr); | |
394 | ||
395 | /* Set Link State Request retransmission timer. */ | |
396 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | void | |
402 | ospf_ls_req_event (struct ospf_neighbor *nbr) | |
403 | { | |
404 | if (nbr->t_ls_req) | |
405 | { | |
406 | thread_cancel (nbr->t_ls_req); | |
407 | nbr->t_ls_req = NULL; | |
408 | } | |
409 | nbr->t_ls_req = thread_add_event (master, ospf_ls_req_timer, nbr, 0); | |
410 | } | |
411 | ||
412 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
413 | ospf_neighbor.c */ | |
414 | int | |
415 | ospf_ls_upd_timer (struct thread *thread) | |
416 | { | |
417 | struct ospf_neighbor *nbr; | |
418 | ||
419 | nbr = THREAD_ARG (thread); | |
420 | nbr->t_ls_upd = NULL; | |
421 | ||
422 | /* Send Link State Update. */ | |
423 | if (ospf_ls_retransmit_count (nbr) > 0) | |
424 | { | |
52dc7ee6 | 425 | struct list *update; |
718e3744 | 426 | struct ospf_lsdb *lsdb; |
427 | int i; | |
718e3744 | 428 | int retransmit_interval; |
429 | ||
718e3744 | 430 | retransmit_interval = OSPF_IF_PARAM (nbr->oi, retransmit_interval); |
431 | ||
432 | lsdb = &nbr->ls_rxmt; | |
433 | update = list_new (); | |
434 | ||
435 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
436 | { | |
437 | struct route_table *table = lsdb->type[i].db; | |
438 | struct route_node *rn; | |
439 | ||
440 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
441 | { | |
442 | struct ospf_lsa *lsa; | |
443 | ||
444 | if ((lsa = rn->info) != NULL) | |
445 | /* Don't retransmit an LSA if we received it within | |
446 | the last RxmtInterval seconds - this is to allow the | |
447 | neighbour a chance to acknowledge the LSA as it may | |
448 | have ben just received before the retransmit timer | |
449 | fired. This is a small tweak to what is in the RFC, | |
450 | but it will cut out out a lot of retransmit traffic | |
451 | - MAG */ | |
2518efd1 | 452 | if (tv_cmp (tv_sub (recent_relative_time (), lsa->tv_recv), |
718e3744 | 453 | int2tv (retransmit_interval)) >= 0) |
454 | listnode_add (update, rn->info); | |
455 | } | |
456 | } | |
457 | ||
458 | if (listcount (update) > 0) | |
459 | ospf_ls_upd_send (nbr, update, OSPF_SEND_PACKET_DIRECT); | |
460 | list_delete (update); | |
461 | } | |
462 | ||
463 | /* Set LS Update retransmission timer. */ | |
464 | OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
469 | int | |
470 | ospf_ls_ack_timer (struct thread *thread) | |
471 | { | |
472 | struct ospf_interface *oi; | |
473 | ||
474 | oi = THREAD_ARG (thread); | |
475 | oi->t_ls_ack = NULL; | |
476 | ||
477 | /* Send Link State Acknowledgment. */ | |
478 | if (listcount (oi->ls_ack) > 0) | |
479 | ospf_ls_ack_send_delayed (oi); | |
480 | ||
481 | /* Set LS Ack timer. */ | |
482 | OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
0bfeca3f | 487 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
5dcbdf82 | 488 | static void |
6a99f831 | 489 | ospf_write_frags (int fd, struct ospf_packet *op, struct ip *iph, |
62d8e96a | 490 | struct msghdr *msg, unsigned int maxdatasize, |
37ccfa3d | 491 | unsigned int mtu, int flags, u_char type) |
0bfeca3f | 492 | { |
493 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
6a99f831 | 494 | u_int16_t offset; |
62d8e96a | 495 | struct iovec *iovp; |
6a99f831 | 496 | int ret; |
0bfeca3f | 497 | |
498 | assert ( op->length == stream_get_endp(op->s) ); | |
62d8e96a | 499 | assert (msg->msg_iovlen == 2); |
0bfeca3f | 500 | |
501 | /* we can but try. | |
502 | * | |
503 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
504 | * well as the IP_MF flag, making this all quite pointless. | |
505 | * | |
506 | * However, for a system on which IP_MF is left alone, and ip_id left | |
507 | * alone or else which sets same ip_id for each fragment this might | |
508 | * work, eg linux. | |
509 | * | |
510 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
511 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
512 | * be raised against the various kernels. | |
513 | */ | |
514 | ||
515 | /* set More Frag */ | |
516 | iph->ip_off |= IP_MF; | |
517 | ||
518 | /* ip frag offset is expressed in units of 8byte words */ | |
519 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
520 | ||
62d8e96a | 521 | iovp = &msg->msg_iov[1]; |
522 | ||
0bfeca3f | 523 | while ( (stream_get_endp(op->s) - stream_get_getp (op->s)) |
524 | > maxdatasize ) | |
525 | { | |
526 | /* data length of this frag is to next offset value */ | |
62d8e96a | 527 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; |
528 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
6a99f831 | 529 | assert (iph->ip_len <= mtu); |
0bfeca3f | 530 | |
18b12c38 | 531 | sockopt_iphdrincl_swab_htosys (iph); |
0bfeca3f | 532 | |
6a99f831 | 533 | ret = sendmsg (fd, msg, flags); |
0bfeca3f | 534 | |
18b12c38 | 535 | sockopt_iphdrincl_swab_systoh (iph); |
0bfeca3f | 536 | |
537 | if (ret < 0) | |
37ccfa3d | 538 | zlog_warn ("*** ospf_write_frags: sendmsg failed to %s," |
5dcbdf82 | 539 | " id %d, off %d, len %d, mtu %u failed with %s", |
540 | inet_ntoa (iph->ip_dst), | |
541 | iph->ip_id, | |
542 | iph->ip_off, | |
543 | iph->ip_len, | |
544 | mtu, | |
545 | safe_strerror (errno)); | |
0bfeca3f | 546 | |
37ccfa3d | 547 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) |
548 | { | |
2a42e285 | 549 | zlog_debug ("ospf_write_frags: sent id %d, off %d, len %d to %s\n", |
37ccfa3d | 550 | iph->ip_id, iph->ip_off, iph->ip_len, |
551 | inet_ntoa (iph->ip_dst)); | |
552 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
553 | { | |
2a42e285 | 554 | zlog_debug ("-----------------IP Header Dump----------------------"); |
37ccfa3d | 555 | ospf_ip_header_dump (iph); |
2a42e285 | 556 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 557 | } |
558 | } | |
559 | ||
0bfeca3f | 560 | iph->ip_off += offset; |
9985f83c | 561 | stream_forward_getp (op->s, iovp->iov_len); |
62d8e96a | 562 | iovp->iov_base = STREAM_PNT (op->s); |
0bfeca3f | 563 | } |
564 | ||
565 | /* setup for final fragment */ | |
62d8e96a | 566 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp (op->s); |
567 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
0bfeca3f | 568 | iph->ip_off &= (~IP_MF); |
569 | } | |
570 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
571 | ||
5dcbdf82 | 572 | static int |
718e3744 | 573 | ospf_write (struct thread *thread) |
574 | { | |
68980084 | 575 | struct ospf *ospf = THREAD_ARG (thread); |
718e3744 | 576 | struct ospf_interface *oi; |
577 | struct ospf_packet *op; | |
578 | struct sockaddr_in sa_dst; | |
718e3744 | 579 | struct ip iph; |
580 | struct msghdr msg; | |
62d8e96a | 581 | struct iovec iov[2]; |
68980084 | 582 | u_char type; |
583 | int ret; | |
584 | int flags = 0; | |
52dc7ee6 | 585 | struct listnode *node; |
0bfeca3f | 586 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 587 | static u_int16_t ipid = 0; |
0bfeca3f | 588 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
6a99f831 | 589 | u_int16_t maxdatasize; |
68b7339a | 590 | #define OSPF_WRITE_IPHL_SHIFT 2 |
718e3744 | 591 | |
68980084 | 592 | ospf->t_write = NULL; |
718e3744 | 593 | |
68980084 | 594 | node = listhead (ospf->oi_write_q); |
718e3744 | 595 | assert (node); |
1eb8ef25 | 596 | oi = listgetdata (node); |
718e3744 | 597 | assert (oi); |
0bfeca3f | 598 | |
599 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
68b7339a | 600 | /* seed ipid static with low order bits of time */ |
601 | if (ipid == 0) | |
602 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 603 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
604 | ||
b7fe4141 DO |
605 | /* convenience - max OSPF data per packet, |
606 | * and reliability - not more data, than our | |
607 | * socket can accept | |
608 | */ | |
609 | maxdatasize = MIN (oi->ifp->mtu, ospf->maxsndbuflen) - | |
610 | sizeof (struct ip); | |
68b7339a | 611 | |
718e3744 | 612 | /* Get one packet from queue. */ |
613 | op = ospf_fifo_head (oi->obuf); | |
614 | assert (op); | |
615 | assert (op->length >= OSPF_HEADER_SIZE); | |
616 | ||
68980084 | 617 | if (op->dst.s_addr == htonl (OSPF_ALLSPFROUTERS) |
618 | || op->dst.s_addr == htonl (OSPF_ALLDROUTERS)) | |
68b7339a | 619 | ospf_if_ipmulticast (ospf, oi->address, oi->ifp->ifindex); |
620 | ||
718e3744 | 621 | /* Rewrite the md5 signature & update the seq */ |
622 | ospf_make_md5_digest (oi, op); | |
623 | ||
37ccfa3d | 624 | /* Retrieve OSPF packet type. */ |
625 | stream_set_getp (op->s, 1); | |
626 | type = stream_getc (op->s); | |
627 | ||
68b7339a | 628 | /* reset get pointer */ |
629 | stream_set_getp (op->s, 0); | |
630 | ||
631 | memset (&iph, 0, sizeof (struct ip)); | |
718e3744 | 632 | memset (&sa_dst, 0, sizeof (sa_dst)); |
68b7339a | 633 | |
718e3744 | 634 | sa_dst.sin_family = AF_INET; |
6f0e3f6e | 635 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
718e3744 | 636 | sa_dst.sin_len = sizeof(sa_dst); |
6f0e3f6e | 637 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 638 | sa_dst.sin_addr = op->dst; |
639 | sa_dst.sin_port = htons (0); | |
640 | ||
641 | /* Set DONTROUTE flag if dst is unicast. */ | |
642 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
643 | if (!IN_MULTICAST (htonl (op->dst.s_addr))) | |
644 | flags = MSG_DONTROUTE; | |
645 | ||
68b7339a | 646 | iph.ip_hl = sizeof (struct ip) >> OSPF_WRITE_IPHL_SHIFT; |
647 | /* it'd be very strange for header to not be 4byte-word aligned but.. */ | |
6c835671 | 648 | if ( sizeof (struct ip) |
649 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) ) | |
68b7339a | 650 | iph.ip_hl++; /* we presume sizeof struct ip cant overflow ip_hl.. */ |
651 | ||
718e3744 | 652 | iph.ip_v = IPVERSION; |
68980084 | 653 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; |
68b7339a | 654 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; |
68b7339a | 655 | |
0bfeca3f | 656 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 657 | /* XXX-MT: not thread-safe at all.. |
658 | * XXX: this presumes this is only programme sending OSPF packets | |
659 | * otherwise, no guarantee ipid will be unique | |
660 | */ | |
661 | iph.ip_id = ++ipid; | |
0bfeca3f | 662 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
663 | ||
718e3744 | 664 | iph.ip_off = 0; |
665 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
666 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
667 | else | |
668 | iph.ip_ttl = OSPF_IP_TTL; | |
669 | iph.ip_p = IPPROTO_OSPFIGP; | |
670 | iph.ip_sum = 0; | |
671 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
672 | iph.ip_dst.s_addr = op->dst.s_addr; | |
673 | ||
674 | memset (&msg, 0, sizeof (msg)); | |
68defd6d | 675 | msg.msg_name = (caddr_t) &sa_dst; |
718e3744 | 676 | msg.msg_namelen = sizeof (sa_dst); |
677 | msg.msg_iov = iov; | |
678 | msg.msg_iovlen = 2; | |
679 | iov[0].iov_base = (char*)&iph; | |
68b7339a | 680 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; |
681 | iov[1].iov_base = STREAM_PNT (op->s); | |
718e3744 | 682 | iov[1].iov_len = op->length; |
68b7339a | 683 | |
684 | /* Sadly we can not rely on kernels to fragment packets because of either | |
685 | * IP_HDRINCL and/or multicast destination being set. | |
686 | */ | |
0bfeca3f | 687 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 688 | if ( op->length > maxdatasize ) |
62d8e96a | 689 | ospf_write_frags (ospf->fd, op, &iph, &msg, maxdatasize, |
690 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 691 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 692 | |
68b7339a | 693 | /* send final fragment (could be first) */ |
18b12c38 | 694 | sockopt_iphdrincl_swab_htosys (&iph); |
68980084 | 695 | ret = sendmsg (ospf->fd, &msg, flags); |
6b333611 | 696 | sockopt_iphdrincl_swab_systoh (&iph); |
718e3744 | 697 | |
698 | if (ret < 0) | |
083ee9d9 | 699 | zlog_warn ("*** sendmsg in ospf_write failed to %s, " |
5dcbdf82 | 700 | "id %d, off %d, len %d, interface %s, mtu %u: %s", |
083ee9d9 | 701 | inet_ntoa (iph.ip_dst), iph.ip_id, iph.ip_off, iph.ip_len, |
5dcbdf82 | 702 | oi->ifp->name, oi->ifp->mtu, safe_strerror (errno)); |
718e3744 | 703 | |
718e3744 | 704 | /* Show debug sending packet. */ |
705 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) | |
706 | { | |
707 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
708 | { | |
2a42e285 | 709 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 710 | ospf_ip_header_dump (&iph); |
718e3744 | 711 | stream_set_getp (op->s, 0); |
712 | ospf_packet_dump (op->s); | |
713 | } | |
714 | ||
2a42e285 | 715 | zlog_debug ("%s sent to [%s] via [%s].", |
718e3744 | 716 | ospf_packet_type_str[type], inet_ntoa (op->dst), |
717 | IF_NAME (oi)); | |
718 | ||
719 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
2a42e285 | 720 | zlog_debug ("-----------------------------------------------------"); |
718e3744 | 721 | } |
722 | ||
723 | /* Now delete packet from queue. */ | |
724 | ospf_packet_delete (oi); | |
725 | ||
726 | if (ospf_fifo_head (oi->obuf) == NULL) | |
727 | { | |
728 | oi->on_write_q = 0; | |
68980084 | 729 | list_delete_node (ospf->oi_write_q, node); |
718e3744 | 730 | } |
731 | ||
732 | /* If packets still remain in queue, call write thread. */ | |
68980084 | 733 | if (!list_isempty (ospf->oi_write_q)) |
734 | ospf->t_write = | |
735 | thread_add_write (master, ospf_write, ospf, ospf->fd); | |
718e3744 | 736 | |
737 | return 0; | |
738 | } | |
739 | ||
740 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
4dadc291 | 741 | static void |
718e3744 | 742 | ospf_hello (struct ip *iph, struct ospf_header *ospfh, |
743 | struct stream * s, struct ospf_interface *oi, int size) | |
744 | { | |
745 | struct ospf_hello *hello; | |
746 | struct ospf_neighbor *nbr; | |
718e3744 | 747 | int old_state; |
d3f0d621 | 748 | struct prefix p; |
718e3744 | 749 | |
750 | /* increment statistics. */ | |
751 | oi->hello_in++; | |
752 | ||
753 | hello = (struct ospf_hello *) STREAM_PNT (s); | |
754 | ||
755 | /* If Hello is myself, silently discard. */ | |
68980084 | 756 | if (IPV4_ADDR_SAME (&ospfh->router_id, &oi->ospf->router_id)) |
d324181c | 757 | { |
758 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
759 | { | |
2a42e285 | 760 | zlog_debug ("ospf_header[%s/%s]: selforiginated, " |
d324181c | 761 | "dropping.", |
762 | ospf_packet_type_str[ospfh->type], | |
763 | inet_ntoa (iph->ip_src)); | |
764 | } | |
765 | return; | |
766 | } | |
718e3744 | 767 | |
718e3744 | 768 | /* get neighbor prefix. */ |
769 | p.family = AF_INET; | |
770 | p.prefixlen = ip_masklen (hello->network_mask); | |
771 | p.u.prefix4 = iph->ip_src; | |
772 | ||
773 | /* Compare network mask. */ | |
774 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
775 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
776 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
777 | if (oi->address->prefixlen != p.prefixlen) | |
778 | { | |
13cd3dc1 AS |
779 | zlog_warn ("Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).", |
780 | inet_ntoa(ospfh->router_id), IF_NAME(oi), | |
781 | (int)oi->address->prefixlen, (int)p.prefixlen); | |
718e3744 | 782 | return; |
783 | } | |
784 | ||
718e3744 | 785 | /* Compare Router Dead Interval. */ |
786 | if (OSPF_IF_PARAM (oi, v_wait) != ntohl (hello->dead_interval)) | |
787 | { | |
08c83671 AS |
788 | zlog_warn ("Packet %s [Hello:RECV]: RouterDeadInterval mismatch " |
789 | "(expected %u, but received %u).", | |
790 | inet_ntoa(ospfh->router_id), | |
791 | OSPF_IF_PARAM(oi, v_wait), ntohl(hello->dead_interval)); | |
718e3744 | 792 | return; |
793 | } | |
794 | ||
f9ad937f | 795 | /* Compare Hello Interval - ignored if fast-hellos are set. */ |
796 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) | |
797 | { | |
798 | if (OSPF_IF_PARAM (oi, v_hello) != ntohs (hello->hello_interval)) | |
799 | { | |
08c83671 AS |
800 | zlog_warn ("Packet %s [Hello:RECV]: HelloInterval mismatch " |
801 | "(expected %u, but received %u).", | |
802 | inet_ntoa(ospfh->router_id), | |
803 | OSPF_IF_PARAM(oi, v_hello), ntohs(hello->hello_interval)); | |
f9ad937f | 804 | return; |
805 | } | |
806 | } | |
807 | ||
718e3744 | 808 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 809 | zlog_debug ("Packet %s [Hello:RECV]: Options %s", |
718e3744 | 810 | inet_ntoa (ospfh->router_id), |
811 | ospf_options_dump (hello->options)); | |
812 | ||
813 | /* Compare options. */ | |
814 | #define REJECT_IF_TBIT_ON 1 /* XXX */ | |
815 | #ifdef REJECT_IF_TBIT_ON | |
816 | if (CHECK_FLAG (hello->options, OSPF_OPTION_T)) | |
817 | { | |
818 | /* | |
819 | * This router does not support non-zero TOS. | |
820 | * Drop this Hello packet not to establish neighbor relationship. | |
821 | */ | |
822 | zlog_warn ("Packet %s [Hello:RECV]: T-bit on, drop it.", | |
823 | inet_ntoa (ospfh->router_id)); | |
824 | return; | |
825 | } | |
826 | #endif /* REJECT_IF_TBIT_ON */ | |
827 | ||
828 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 829 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
718e3744 | 830 | && CHECK_FLAG (hello->options, OSPF_OPTION_O)) |
831 | { | |
832 | /* | |
833 | * This router does know the correct usage of O-bit | |
834 | * the bit should be set in DD packet only. | |
835 | */ | |
836 | zlog_warn ("Packet %s [Hello:RECV]: O-bit abuse?", | |
837 | inet_ntoa (ospfh->router_id)); | |
838 | #ifdef STRICT_OBIT_USAGE_CHECK | |
839 | return; /* Reject this packet. */ | |
840 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
841 | UNSET_FLAG (hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
842 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
843 | } | |
844 | #endif /* HAVE_OPAQUE_LSA */ | |
845 | ||
846 | /* new for NSSA is to ensure that NP is on and E is off */ | |
847 | ||
718e3744 | 848 | if (oi->area->external_routing == OSPF_AREA_NSSA) |
849 | { | |
850 | if (! (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_NP) | |
851 | && CHECK_FLAG (hello->options, OSPF_OPTION_NP) | |
852 | && ! CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) | |
853 | && ! CHECK_FLAG (hello->options, OSPF_OPTION_E))) | |
854 | { | |
855 | zlog_warn ("NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", inet_ntoa (ospfh->router_id), OPTIONS (oi), hello->options); | |
856 | return; | |
857 | } | |
858 | if (IS_DEBUG_OSPF_NSSA) | |
2a42e285 | 859 | zlog_debug ("NSSA-Hello:RECV:Packet from %s:", inet_ntoa(ospfh->router_id)); |
718e3744 | 860 | } |
861 | else | |
718e3744 | 862 | /* The setting of the E-bit found in the Hello Packet's Options |
863 | field must match this area's ExternalRoutingCapability A | |
864 | mismatch causes processing to stop and the packet to be | |
865 | dropped. The setting of the rest of the bits in the Hello | |
866 | Packet's Options field should be ignored. */ | |
867 | if (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) != | |
868 | CHECK_FLAG (hello->options, OSPF_OPTION_E)) | |
869 | { | |
3aa8d5f9 | 870 | zlog_warn ("Packet %s [Hello:RECV]: my options: %x, his options %x", |
871 | inet_ntoa(ospfh->router_id), OPTIONS (oi), hello->options); | |
718e3744 | 872 | return; |
873 | } | |
718e3744 | 874 | |
d3f0d621 | 875 | /* get neighbour struct */ |
876 | nbr = ospf_nbr_get (oi, ospfh, iph, &p); | |
877 | ||
878 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
879 | assert (nbr); | |
718e3744 | 880 | |
881 | old_state = nbr->state; | |
882 | ||
883 | /* Add event to thread. */ | |
884 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_HelloReceived); | |
885 | ||
886 | /* RFC2328 Section 9.5.1 | |
887 | If the router is not eligible to become Designated Router, | |
888 | (snip) It must also send an Hello Packet in reply to an | |
889 | Hello Packet received from any eligible neighbor (other than | |
890 | the current Designated Router and Backup Designated Router). */ | |
891 | if (oi->type == OSPF_IFTYPE_NBMA) | |
892 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
893 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
894 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
895 | OSPF_NSM_TIMER_ON (nbr->t_hello_reply, ospf_hello_reply_timer, | |
896 | OSPF_HELLO_REPLY_DELAY); | |
897 | ||
898 | /* on NBMA network type, it happens to receive bidirectional Hello packet | |
899 | without advance 1-Way Received event. | |
900 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
901 | if (oi->type == OSPF_IFTYPE_NBMA && | |
902 | (old_state == NSM_Down || old_state == NSM_Attempt)) | |
903 | { | |
904 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_OneWayReceived); | |
905 | nbr->priority = hello->priority; | |
906 | nbr->d_router = hello->d_router; | |
907 | nbr->bd_router = hello->bd_router; | |
908 | return; | |
909 | } | |
910 | ||
68980084 | 911 | if (ospf_nbr_bidirectional (&oi->ospf->router_id, hello->neighbors, |
718e3744 | 912 | size - OSPF_HELLO_MIN_SIZE)) |
913 | { | |
914 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived); | |
915 | nbr->options |= hello->options; | |
916 | } | |
917 | else | |
918 | { | |
919 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_OneWayReceived); | |
920 | /* Set neighbor information. */ | |
921 | nbr->priority = hello->priority; | |
922 | nbr->d_router = hello->d_router; | |
923 | nbr->bd_router = hello->bd_router; | |
924 | return; | |
925 | } | |
926 | ||
927 | /* If neighbor itself declares DR and no BDR exists, | |
928 | cause event BackupSeen */ | |
929 | if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router)) | |
930 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
931 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
932 | ||
933 | /* neighbor itself declares BDR. */ | |
934 | if (oi->state == ISM_Waiting && | |
935 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router)) | |
936 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
937 | ||
938 | /* had not previously. */ | |
939 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router) && | |
940 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->d_router)) || | |
941 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->d_router) && | |
942 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->d_router))) | |
943 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
944 | ||
945 | /* had not previously. */ | |
946 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router) && | |
947 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->bd_router)) || | |
948 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->bd_router) && | |
949 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->bd_router))) | |
950 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
951 | ||
952 | /* Neighbor priority check. */ | |
953 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
954 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
955 | ||
956 | /* Set neighbor information. */ | |
957 | nbr->priority = hello->priority; | |
958 | nbr->d_router = hello->d_router; | |
959 | nbr->bd_router = hello->bd_router; | |
960 | } | |
961 | ||
962 | /* Save DD flags/options/Seqnum received. */ | |
4dadc291 | 963 | static void |
718e3744 | 964 | ospf_db_desc_save_current (struct ospf_neighbor *nbr, |
965 | struct ospf_db_desc *dd) | |
966 | { | |
967 | nbr->last_recv.flags = dd->flags; | |
968 | nbr->last_recv.options = dd->options; | |
969 | nbr->last_recv.dd_seqnum = ntohl (dd->dd_seqnum); | |
970 | } | |
971 | ||
972 | /* Process rest of DD packet. */ | |
973 | static void | |
974 | ospf_db_desc_proc (struct stream *s, struct ospf_interface *oi, | |
975 | struct ospf_neighbor *nbr, struct ospf_db_desc *dd, | |
976 | u_int16_t size) | |
977 | { | |
978 | struct ospf_lsa *new, *find; | |
979 | struct lsa_header *lsah; | |
980 | ||
9985f83c | 981 | stream_forward_getp (s, OSPF_DB_DESC_MIN_SIZE); |
718e3744 | 982 | for (size -= OSPF_DB_DESC_MIN_SIZE; |
983 | size >= OSPF_LSA_HEADER_SIZE; size -= OSPF_LSA_HEADER_SIZE) | |
984 | { | |
985 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
9985f83c | 986 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 987 | |
988 | /* Unknown LS type. */ | |
989 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
990 | { | |
bec595ad | 991 | zlog_warn ("Packet [DD:RECV]: Unknown LS type %d.", lsah->type); |
718e3744 | 992 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
993 | return; | |
994 | } | |
995 | ||
996 | #ifdef HAVE_OPAQUE_LSA | |
997 | if (IS_OPAQUE_LSA (lsah->type) | |
998 | && ! CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
999 | { | |
1000 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1001 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1002 | return; | |
1003 | } | |
1004 | #endif /* HAVE_OPAQUE_LSA */ | |
1005 | ||
1006 | switch (lsah->type) | |
1007 | { | |
1008 | case OSPF_AS_EXTERNAL_LSA: | |
1009 | #ifdef HAVE_OPAQUE_LSA | |
1010 | case OSPF_OPAQUE_AS_LSA: | |
1011 | #endif /* HAVE_OPAQUE_LSA */ | |
718e3744 | 1012 | /* Check for stub area. Reject if AS-External from stub but |
1013 | allow if from NSSA. */ | |
1014 | if (oi->area->external_routing == OSPF_AREA_STUB) | |
718e3744 | 1015 | { |
1016 | zlog_warn ("Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", | |
1017 | lsah->type, inet_ntoa (lsah->id), | |
1018 | (oi->area->external_routing == OSPF_AREA_STUB) ?\ | |
1019 | "STUB" : "NSSA"); | |
1020 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1021 | return; | |
1022 | } | |
1023 | break; | |
1024 | default: | |
1025 | break; | |
1026 | } | |
1027 | ||
1028 | /* Create LS-request object. */ | |
1029 | new = ospf_ls_request_new (lsah); | |
1030 | ||
1031 | /* Lookup received LSA, then add LS request list. */ | |
1032 | find = ospf_lsa_lookup_by_header (oi->area, lsah); | |
f0894cf8 PJ |
1033 | |
1034 | /* ospf_lsa_more_recent is fine with NULL pointers */ | |
1035 | switch (ospf_lsa_more_recent (find, new)) | |
1036 | { | |
1037 | case -1: | |
1038 | /* Neighbour has a more recent LSA, we must request it */ | |
1039 | ospf_ls_request_add (nbr, new); | |
1040 | case 0: | |
1041 | /* If we have a copy of this LSA, it's either less recent | |
1042 | * and we're requesting it from neighbour (the case above), or | |
1043 | * it's as recent and we both have same copy (this case). | |
1044 | * | |
1045 | * In neither of these two cases is there any point in | |
1046 | * describing our copy of the LSA to the neighbour in a | |
1047 | * DB-Summary packet, if we're still intending to do so. | |
1048 | * | |
1049 | * See: draft-ogier-ospf-dbex-opt-00.txt, describing the | |
1050 | * backward compatible optimisation to OSPF DB Exchange / | |
1051 | * DB Description process implemented here. | |
1052 | */ | |
1053 | if (find) | |
1054 | ospf_lsdb_delete (&nbr->db_sum, find); | |
1055 | ospf_lsa_discard (new); | |
1056 | break; | |
1057 | default: | |
1058 | /* We have the more recent copy, nothing specific to do: | |
1059 | * - no need to request neighbours stale copy | |
1060 | * - must leave DB summary list copy alone | |
1061 | */ | |
1062 | if (IS_DEBUG_OSPF_EVENT) | |
1063 | zlog_debug ("Packet [DD:RECV]: LSA received Type %d, " | |
1064 | "ID %s is not recent.", lsah->type, inet_ntoa (lsah->id)); | |
1065 | ospf_lsa_discard (new); | |
1066 | } | |
718e3744 | 1067 | } |
1068 | ||
1069 | /* Master */ | |
1070 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1071 | { | |
1072 | nbr->dd_seqnum++; | |
8dd24ee6 PJ |
1073 | |
1074 | /* Both sides have no More, then we're done with Exchange */ | |
718e3744 | 1075 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) |
1076 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
1077 | else | |
718e3744 | 1078 | ospf_db_desc_send (nbr); |
1079 | } | |
1080 | /* Slave */ | |
1081 | else | |
1082 | { | |
1083 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); | |
1084 | ||
8dd24ee6 PJ |
1085 | /* Send DD packet in reply. |
1086 | * | |
1087 | * Must be done to acknowledge the Master's DD, regardless of | |
1088 | * whether we have more LSAs ourselves to describe. | |
1089 | * | |
1090 | * This function will clear the 'More' bit, if after this DD | |
1091 | * we have no more LSAs to describe to the master.. | |
1092 | */ | |
718e3744 | 1093 | ospf_db_desc_send (nbr); |
8dd24ee6 PJ |
1094 | |
1095 | /* Slave can raise ExchangeDone now, if master is also done */ | |
1096 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) | |
1097 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
718e3744 | 1098 | } |
8dd24ee6 | 1099 | |
718e3744 | 1100 | /* Save received neighbor values from DD. */ |
1101 | ospf_db_desc_save_current (nbr, dd); | |
1102 | } | |
1103 | ||
4dadc291 | 1104 | static int |
718e3744 | 1105 | ospf_db_desc_is_dup (struct ospf_db_desc *dd, struct ospf_neighbor *nbr) |
1106 | { | |
1107 | /* Is DD duplicated? */ | |
1108 | if (dd->options == nbr->last_recv.options && | |
1109 | dd->flags == nbr->last_recv.flags && | |
1110 | dd->dd_seqnum == htonl (nbr->last_recv.dd_seqnum)) | |
1111 | return 1; | |
1112 | ||
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
3aa8d5f9 | 1117 | static void |
718e3744 | 1118 | ospf_db_desc (struct ip *iph, struct ospf_header *ospfh, |
1119 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1120 | { | |
1121 | struct ospf_db_desc *dd; | |
1122 | struct ospf_neighbor *nbr; | |
1123 | ||
1124 | /* Increment statistics. */ | |
1125 | oi->db_desc_in++; | |
1126 | ||
1127 | dd = (struct ospf_db_desc *) STREAM_PNT (s); | |
d363df2c | 1128 | |
d3f0d621 | 1129 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1130 | if (nbr == NULL) |
1131 | { | |
1132 | zlog_warn ("Packet[DD]: Unknown Neighbor %s", | |
1133 | inet_ntoa (ospfh->router_id)); | |
1134 | return; | |
1135 | } | |
1136 | ||
1137 | /* Check MTU. */ | |
ba682537 | 1138 | if ((OSPF_IF_PARAM (oi, mtu_ignore) == 0) && |
1139 | (ntohs (dd->mtu) > oi->ifp->mtu)) | |
718e3744 | 1140 | { |
3aa8d5f9 | 1141 | zlog_warn ("Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", |
1142 | inet_ntoa (nbr->router_id), ntohs (dd->mtu), | |
1143 | IF_NAME (oi), oi->ifp->mtu); | |
718e3744 | 1144 | return; |
1145 | } | |
1146 | ||
d363df2c | 1147 | /* |
1148 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is not | |
1149 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1150 | * Until proper solution is developped, this hack should help. | |
1151 | * | |
1152 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1153 | * options, unfortunately its use in DD options is not specified. Hence some | |
1154 | * implementations follow E-bit semantics and set it in DD options, and some | |
1155 | * treat it as unspecified and hence follow the directive "default for | |
1156 | * options is clear", ie unset. | |
1157 | * | |
1158 | * Reset the flag, as ospfd follows E-bit semantics. | |
1159 | */ | |
1160 | if ( (oi->area->external_routing == OSPF_AREA_NSSA) | |
1161 | && (CHECK_FLAG (nbr->options, OSPF_OPTION_NP)) | |
1162 | && (!CHECK_FLAG (dd->options, OSPF_OPTION_NP)) ) | |
1163 | { | |
1164 | if (IS_DEBUG_OSPF_EVENT) | |
1210fa66 | 1165 | zlog_debug ("Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", |
d363df2c | 1166 | inet_ntoa (nbr->router_id) ); |
1167 | SET_FLAG (dd->options, OSPF_OPTION_NP); | |
1168 | } | |
d363df2c | 1169 | |
718e3744 | 1170 | #ifdef REJECT_IF_TBIT_ON |
1171 | if (CHECK_FLAG (dd->options, OSPF_OPTION_T)) | |
1172 | { | |
1173 | /* | |
1174 | * In Hello protocol, optional capability must have checked | |
1175 | * to prevent this T-bit enabled router be my neighbor. | |
1176 | */ | |
1177 | zlog_warn ("Packet[DD]: Neighbor %s: T-bit on?", inet_ntoa (nbr->router_id)); | |
1178 | return; | |
1179 | } | |
1180 | #endif /* REJECT_IF_TBIT_ON */ | |
1181 | ||
1182 | #ifdef HAVE_OPAQUE_LSA | |
1183 | if (CHECK_FLAG (dd->options, OSPF_OPTION_O) | |
68980084 | 1184 | && !CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1185 | { |
1186 | /* | |
1187 | * This node is not configured to handle O-bit, for now. | |
1188 | * Clear it to ignore unsupported capability proposed by neighbor. | |
1189 | */ | |
1190 | UNSET_FLAG (dd->options, OSPF_OPTION_O); | |
1191 | } | |
1192 | #endif /* HAVE_OPAQUE_LSA */ | |
1193 | ||
1194 | /* Process DD packet by neighbor status. */ | |
1195 | switch (nbr->state) | |
1196 | { | |
1197 | case NSM_Down: | |
1198 | case NSM_Attempt: | |
1199 | case NSM_TwoWay: | |
bec595ad | 1200 | zlog_warn ("Packet[DD]: Neighbor %s state is %s, packet discarded.", |
3aa8d5f9 | 1201 | inet_ntoa(nbr->router_id), |
718e3744 | 1202 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1203 | break; | |
1204 | case NSM_Init: | |
1205 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived); | |
1206 | /* If the new state is ExStart, the processing of the current | |
1207 | packet should then continue in this new state by falling | |
1208 | through to case ExStart below. */ | |
1209 | if (nbr->state != NSM_ExStart) | |
1210 | break; | |
1211 | case NSM_ExStart: | |
1212 | /* Initial DBD */ | |
1213 | if ((IS_SET_DD_ALL (dd->flags) == OSPF_DD_FLAG_ALL) && | |
1214 | (size == OSPF_DB_DESC_MIN_SIZE)) | |
1215 | { | |
68980084 | 1216 | if (IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) > 0) |
718e3744 | 1217 | { |
1218 | /* We're Slave---obey */ | |
17eaa728 | 1219 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Slave).", |
3aa8d5f9 | 1220 | inet_ntoa(nbr->router_id)); |
718e3744 | 1221 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); |
8dd24ee6 PJ |
1222 | |
1223 | /* Reset I/MS */ | |
1224 | UNSET_FLAG (nbr->dd_flags, (OSPF_DD_FLAG_MS|OSPF_DD_FLAG_I)); | |
718e3744 | 1225 | } |
1226 | else | |
1227 | { | |
1228 | /* We're Master, ignore the initial DBD from Slave */ | |
6d45276f | 1229 | zlog_info ("Packet[DD]: Neighbor %s: Initial DBD from Slave, " |
3aa8d5f9 | 1230 | "ignoring.", inet_ntoa(nbr->router_id)); |
718e3744 | 1231 | break; |
1232 | } | |
1233 | } | |
1234 | /* Ack from the Slave */ | |
1235 | else if (!IS_SET_DD_MS (dd->flags) && !IS_SET_DD_I (dd->flags) && | |
1236 | ntohl (dd->dd_seqnum) == nbr->dd_seqnum && | |
68980084 | 1237 | IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) < 0) |
718e3744 | 1238 | { |
17eaa728 | 1239 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Master).", |
3aa8d5f9 | 1240 | inet_ntoa(nbr->router_id)); |
8dd24ee6 PJ |
1241 | /* Reset I, leaving MS */ |
1242 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_I); | |
718e3744 | 1243 | } |
1244 | else | |
1245 | { | |
3aa8d5f9 | 1246 | zlog_warn ("Packet[DD]: Neighbor %s Negotiation fails.", |
1247 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1248 | break; |
1249 | } | |
1250 | ||
1251 | /* This is where the real Options are saved */ | |
1252 | nbr->options = dd->options; | |
1253 | ||
1254 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 1255 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1256 | { |
1257 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1258 | zlog_debug ("Neighbor[%s] is %sOpaque-capable.", |
718e3744 | 1259 | inet_ntoa (nbr->router_id), |
1260 | CHECK_FLAG (nbr->options, OSPF_OPTION_O) ? "" : "NOT "); | |
1261 | ||
1262 | if (! CHECK_FLAG (nbr->options, OSPF_OPTION_O) | |
1263 | && IPV4_ADDR_SAME (&DR (oi), &nbr->address.u.prefix4)) | |
1264 | { | |
6d45276f | 1265 | zlog_warn ("DR-neighbor[%s] is NOT opaque-capable; " |
1266 | "Opaque-LSAs cannot be reliably advertised " | |
1267 | "in this network.", | |
1268 | inet_ntoa (nbr->router_id)); | |
718e3744 | 1269 | /* This situation is undesirable, but not a real error. */ |
1270 | } | |
1271 | } | |
1272 | #endif /* HAVE_OPAQUE_LSA */ | |
1273 | ||
1274 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_NegotiationDone); | |
1275 | ||
1276 | /* continue processing rest of packet. */ | |
1277 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1278 | break; | |
1279 | case NSM_Exchange: | |
1280 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1281 | { | |
1282 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1283 | /* Master: discard duplicated DD packet. */ | |
6d45276f | 1284 | zlog_info ("Packet[DD] (Master): Neighbor %s packet duplicated.", |
3aa8d5f9 | 1285 | inet_ntoa (nbr->router_id)); |
718e3744 | 1286 | else |
1287 | /* Slave: cause to retransmit the last Database Description. */ | |
1288 | { | |
6d45276f | 1289 | zlog_info ("Packet[DD] [Slave]: Neighbor %s packet duplicated.", |
3aa8d5f9 | 1290 | inet_ntoa (nbr->router_id)); |
718e3744 | 1291 | ospf_db_desc_resend (nbr); |
1292 | } | |
1293 | break; | |
1294 | } | |
1295 | ||
1296 | /* Otherwise DD packet should be checked. */ | |
1297 | /* Check Master/Slave bit mismatch */ | |
1298 | if (IS_SET_DD_MS (dd->flags) != IS_SET_DD_MS (nbr->last_recv.flags)) | |
1299 | { | |
3aa8d5f9 | 1300 | zlog_warn ("Packet[DD]: Neighbor %s MS-bit mismatch.", |
1301 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1302 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1303 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1304 | zlog_debug ("Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", |
3aa8d5f9 | 1305 | dd->flags, nbr->dd_flags); |
718e3744 | 1306 | break; |
1307 | } | |
1308 | ||
1309 | /* Check initialize bit is set. */ | |
1310 | if (IS_SET_DD_I (dd->flags)) | |
1311 | { | |
6d45276f | 1312 | zlog_info ("Packet[DD]: Neighbor %s I-bit set.", |
3aa8d5f9 | 1313 | inet_ntoa(nbr->router_id)); |
718e3744 | 1314 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1315 | break; | |
1316 | } | |
1317 | ||
1318 | /* Check DD Options. */ | |
1319 | if (dd->options != nbr->options) | |
1320 | { | |
1321 | #ifdef ORIGINAL_CODING | |
1322 | /* Save the new options for debugging */ | |
1323 | nbr->options = dd->options; | |
1324 | #endif /* ORIGINAL_CODING */ | |
3aa8d5f9 | 1325 | zlog_warn ("Packet[DD]: Neighbor %s options mismatch.", |
1326 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1327 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1328 | break; | |
1329 | } | |
1330 | ||
1331 | /* Check DD sequence number. */ | |
1332 | if ((IS_SET_DD_MS (nbr->dd_flags) && | |
1333 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum) || | |
1334 | (!IS_SET_DD_MS (nbr->dd_flags) && | |
1335 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum + 1)) | |
1336 | { | |
3aa8d5f9 | 1337 | zlog_warn ("Packet[DD]: Neighbor %s sequence number mismatch.", |
1338 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1339 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1340 | break; | |
1341 | } | |
1342 | ||
1343 | /* Continue processing rest of packet. */ | |
1344 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1345 | break; | |
1346 | case NSM_Loading: | |
1347 | case NSM_Full: | |
1348 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1349 | { | |
1350 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1351 | { | |
1352 | /* Master should discard duplicate DD packet. */ | |
6d45276f | 1353 | zlog_info ("Packet[DD]: Neighbor %s duplicated, " |
1354 | "packet discarded.", | |
3aa8d5f9 | 1355 | inet_ntoa(nbr->router_id)); |
718e3744 | 1356 | break; |
1357 | } | |
1358 | else | |
1359 | { | |
1360 | struct timeval t, now; | |
2518efd1 | 1361 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &now); |
718e3744 | 1362 | t = tv_sub (now, nbr->last_send_ts); |
1363 | if (tv_cmp (t, int2tv (nbr->v_inactivity)) < 0) | |
1364 | { | |
1365 | /* In states Loading and Full the slave must resend | |
1366 | its last Database Description packet in response to | |
1367 | duplicate Database Description packets received | |
1368 | from the master. For this reason the slave must | |
1369 | wait RouterDeadInterval seconds before freeing the | |
1370 | last Database Description packet. Reception of a | |
1371 | Database Description packet from the master after | |
1372 | this interval will generate a SeqNumberMismatch | |
1373 | neighbor event. RFC2328 Section 10.8 */ | |
1374 | ospf_db_desc_resend (nbr); | |
1375 | break; | |
1376 | } | |
1377 | } | |
1378 | } | |
1379 | ||
1380 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1381 | break; | |
1382 | default: | |
3aa8d5f9 | 1383 | zlog_warn ("Packet[DD]: Neighbor %s NSM illegal status %u.", |
1384 | inet_ntoa(nbr->router_id), nbr->state); | |
718e3744 | 1385 | break; |
1386 | } | |
1387 | } | |
1388 | ||
1389 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1390 | ||
1391 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
4dadc291 | 1392 | static void |
718e3744 | 1393 | ospf_ls_req (struct ip *iph, struct ospf_header *ospfh, |
1394 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1395 | { | |
1396 | struct ospf_neighbor *nbr; | |
1397 | u_int32_t ls_type; | |
1398 | struct in_addr ls_id; | |
1399 | struct in_addr adv_router; | |
1400 | struct ospf_lsa *find; | |
52dc7ee6 | 1401 | struct list *ls_upd; |
6c835671 | 1402 | unsigned int length; |
718e3744 | 1403 | |
1404 | /* Increment statistics. */ | |
1405 | oi->ls_req_in++; | |
1406 | ||
d3f0d621 | 1407 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1408 | if (nbr == NULL) |
1409 | { | |
1410 | zlog_warn ("Link State Request: Unknown Neighbor %s.", | |
1411 | inet_ntoa (ospfh->router_id)); | |
1412 | return; | |
1413 | } | |
1414 | ||
1415 | /* Neighbor State should be Exchange or later. */ | |
1416 | if (nbr->state != NSM_Exchange && | |
1417 | nbr->state != NSM_Loading && | |
1418 | nbr->state != NSM_Full) | |
1419 | { | |
bec595ad | 1420 | zlog_warn ("Link State Request received from %s: " |
1421 | "Neighbor state is %s, packet discarded.", | |
1422 | inet_ntoa (ospfh->router_id), | |
718e3744 | 1423 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1424 | return; | |
1425 | } | |
1426 | ||
1427 | /* Send Link State Update for ALL requested LSAs. */ | |
1428 | ls_upd = list_new (); | |
1429 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1430 | ||
1431 | while (size >= OSPF_LSA_KEY_SIZE) | |
1432 | { | |
1433 | /* Get one slice of Link State Request. */ | |
1434 | ls_type = stream_getl (s); | |
1435 | ls_id.s_addr = stream_get_ipv4 (s); | |
1436 | adv_router.s_addr = stream_get_ipv4 (s); | |
1437 | ||
1438 | /* Verify LSA type. */ | |
1439 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) | |
1440 | { | |
1441 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1442 | list_delete (ls_upd); | |
1443 | return; | |
1444 | } | |
1445 | ||
1446 | /* Search proper LSA in LSDB. */ | |
1447 | find = ospf_lsa_lookup (oi->area, ls_type, ls_id, adv_router); | |
1448 | if (find == NULL) | |
1449 | { | |
1450 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1451 | list_delete (ls_upd); | |
1452 | return; | |
1453 | } | |
1454 | ||
86f1fd96 | 1455 | /* Packet overflows MTU size, send immediately. */ |
1456 | if (length + ntohs (find->data->length) > ospf_packet_max (oi)) | |
718e3744 | 1457 | { |
1458 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1459 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1460 | else | |
1461 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1462 | ||
1463 | /* Only remove list contents. Keep ls_upd. */ | |
1464 | list_delete_all_node (ls_upd); | |
1465 | ||
1466 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1467 | } | |
1468 | ||
1469 | /* Append LSA to update list. */ | |
1470 | listnode_add (ls_upd, find); | |
1471 | length += ntohs (find->data->length); | |
1472 | ||
1473 | size -= OSPF_LSA_KEY_SIZE; | |
1474 | } | |
1475 | ||
1476 | /* Send rest of Link State Update. */ | |
1477 | if (listcount (ls_upd) > 0) | |
1478 | { | |
1479 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1480 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1481 | else | |
1482 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1483 | ||
1484 | list_delete (ls_upd); | |
1485 | } | |
1486 | else | |
1487 | list_free (ls_upd); | |
1488 | } | |
1489 | ||
1490 | /* Get the list of LSAs from Link State Update packet. | |
1491 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
52dc7ee6 | 1492 | static struct list * |
718e3744 | 1493 | ospf_ls_upd_list_lsa (struct ospf_neighbor *nbr, struct stream *s, |
1494 | struct ospf_interface *oi, size_t size) | |
1495 | { | |
1496 | u_int16_t count, sum; | |
1497 | u_int32_t length; | |
1498 | struct lsa_header *lsah; | |
1499 | struct ospf_lsa *lsa; | |
52dc7ee6 | 1500 | struct list *lsas; |
718e3744 | 1501 | |
1502 | lsas = list_new (); | |
1503 | ||
1504 | count = stream_getl (s); | |
1505 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1506 | ||
1507 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
9985f83c | 1508 | size -= length, stream_forward_getp (s, length), count--) |
718e3744 | 1509 | { |
1510 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
1511 | length = ntohs (lsah->length); | |
1512 | ||
1513 | if (length > size) | |
1514 | { | |
1515 | zlog_warn ("Link State Update: LSA length exceeds packet size."); | |
1516 | break; | |
1517 | } | |
1518 | ||
1519 | /* Validate the LSA's LS checksum. */ | |
1520 | sum = lsah->checksum; | |
1521 | if (sum != ospf_lsa_checksum (lsah)) | |
1522 | { | |
1523 | zlog_warn ("Link State Update: LSA checksum error %x, %x.", | |
1524 | sum, lsah->checksum); | |
1525 | continue; | |
1526 | } | |
1527 | ||
1528 | /* Examine the LSA's LS type. */ | |
1529 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
1530 | { | |
1531 | zlog_warn ("Link State Update: Unknown LS type %d", lsah->type); | |
1532 | continue; | |
1533 | } | |
1534 | ||
1535 | /* | |
1536 | * What if the received LSA's age is greater than MaxAge? | |
1537 | * Treat it as a MaxAge case -- endo. | |
1538 | */ | |
1539 | if (ntohs (lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1540 | lsah->ls_age = htons (OSPF_LSA_MAXAGE); | |
1541 | ||
1542 | #ifdef HAVE_OPAQUE_LSA | |
1543 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1544 | { | |
1545 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1546 | if ((IS_OPAQUE_LSA(lsah->type) && | |
1547 | ! CHECK_FLAG (lsah->options, OSPF_OPTION_O)) | |
1548 | || (! IS_OPAQUE_LSA(lsah->type) && | |
1549 | CHECK_FLAG (lsah->options, OSPF_OPTION_O))) | |
1550 | { | |
1551 | /* | |
1552 | * This neighbor must know the exact usage of O-bit; | |
1553 | * the bit will be set in Type-9,10,11 LSAs only. | |
1554 | */ | |
1555 | zlog_warn ("LSA[Type%d:%s]: O-bit abuse?", lsah->type, inet_ntoa (lsah->id)); | |
1556 | continue; | |
1557 | } | |
1558 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
1559 | ||
1560 | /* Do not take in AS External Opaque-LSAs if we are a stub. */ | |
1561 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1562 | && nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1563 | { | |
1564 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1565 | zlog_debug ("LSA[Type%d:%s]: We are a stub, don't take this LSA.", lsah->type, inet_ntoa (lsah->id)); |
718e3744 | 1566 | continue; |
1567 | } | |
1568 | } | |
1569 | else if (IS_OPAQUE_LSA(lsah->type)) | |
1570 | { | |
1571 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1572 | continue; | |
1573 | } | |
1574 | #endif /* HAVE_OPAQUE_LSA */ | |
1575 | ||
1576 | /* Create OSPF LSA instance. */ | |
1577 | lsa = ospf_lsa_new (); | |
1578 | ||
1579 | /* We may wish to put some error checking if type NSSA comes in | |
1580 | and area not in NSSA mode */ | |
1581 | switch (lsah->type) | |
1582 | { | |
1583 | case OSPF_AS_EXTERNAL_LSA: | |
1584 | #ifdef HAVE_OPAQUE_LSA | |
1585 | case OSPF_OPAQUE_AS_LSA: | |
1586 | lsa->area = NULL; | |
1587 | break; | |
1588 | case OSPF_OPAQUE_LINK_LSA: | |
1589 | lsa->oi = oi; /* Remember incoming interface for flooding control. */ | |
1590 | /* Fallthrough */ | |
1591 | #endif /* HAVE_OPAQUE_LSA */ | |
1592 | default: | |
1593 | lsa->area = oi->area; | |
1594 | break; | |
1595 | } | |
1596 | ||
1597 | lsa->data = ospf_lsa_data_new (length); | |
1598 | memcpy (lsa->data, lsah, length); | |
1599 | ||
1600 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1601 | zlog_debug("LSA[Type%d:%s]: %p new LSA created with Link State Update", |
718e3744 | 1602 | lsa->data->type, inet_ntoa (lsa->data->id), lsa); |
1603 | listnode_add (lsas, lsa); | |
1604 | } | |
1605 | ||
1606 | return lsas; | |
1607 | } | |
1608 | ||
1609 | /* Cleanup Update list. */ | |
4dadc291 | 1610 | static void |
52dc7ee6 | 1611 | ospf_upd_list_clean (struct list *lsas) |
718e3744 | 1612 | { |
1eb8ef25 | 1613 | struct listnode *node, *nnode; |
718e3744 | 1614 | struct ospf_lsa *lsa; |
1615 | ||
1eb8ef25 | 1616 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
1617 | ospf_lsa_discard (lsa); | |
718e3744 | 1618 | |
1619 | list_delete (lsas); | |
1620 | } | |
1621 | ||
1622 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
4dadc291 | 1623 | static void |
718e3744 | 1624 | ospf_ls_upd (struct ip *iph, struct ospf_header *ospfh, |
1625 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1626 | { | |
1627 | struct ospf_neighbor *nbr; | |
52dc7ee6 | 1628 | struct list *lsas; |
1eb8ef25 | 1629 | struct listnode *node, *nnode; |
718e3744 | 1630 | struct ospf_lsa *lsa = NULL; |
1631 | /* unsigned long ls_req_found = 0; */ | |
1632 | ||
1633 | /* Dis-assemble the stream, update each entry, re-encapsulate for flooding */ | |
1634 | ||
1635 | /* Increment statistics. */ | |
1636 | oi->ls_upd_in++; | |
1637 | ||
1638 | /* Check neighbor. */ | |
d3f0d621 | 1639 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1640 | if (nbr == NULL) |
1641 | { | |
1642 | zlog_warn ("Link State Update: Unknown Neighbor %s on int: %s", | |
1643 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); | |
1644 | return; | |
1645 | } | |
1646 | ||
1647 | /* Check neighbor state. */ | |
1648 | if (nbr->state < NSM_Exchange) | |
1649 | { | |
3aa8d5f9 | 1650 | zlog_warn ("Link State Update: " |
1651 | "Neighbor[%s] state %s is less than Exchange", | |
1652 | inet_ntoa (ospfh->router_id), | |
1653 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 1654 | return; |
1655 | } | |
1656 | ||
1657 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages | |
1658 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1659 | * of section 13. | |
1660 | */ | |
1661 | lsas = ospf_ls_upd_list_lsa (nbr, s, oi, size); | |
1662 | ||
1663 | #ifdef HAVE_OPAQUE_LSA | |
718e3744 | 1664 | /* |
1665 | * If self-originated Opaque-LSAs that have flooded before restart | |
1666 | * are contained in the received LSUpd message, corresponding LSReq | |
1667 | * messages to be sent may have to be modified. | |
1668 | * To eliminate possible race conditions such that flushing and normal | |
1669 | * updating for the same LSA would take place alternately, this trick | |
1670 | * must be done before entering to the loop below. | |
1671 | */ | |
69310a67 | 1672 | /* XXX: Why is this Opaque specific? Either our core code is deficient |
1673 | * and this should be fixed generally, or Opaque is inventing strawman | |
1674 | * problems */ | |
718e3744 | 1675 | ospf_opaque_adjust_lsreq (nbr, lsas); |
1676 | #endif /* HAVE_OPAQUE_LSA */ | |
1677 | ||
1678 | #define DISCARD_LSA(L,N) {\ | |
1679 | if (IS_DEBUG_OSPF_EVENT) \ | |
2a42e285 | 1680 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p Type-%d", N, lsa, (int) lsa->data->type); \ |
718e3744 | 1681 | ospf_lsa_discard (L); \ |
1682 | continue; } | |
1683 | ||
1684 | /* Process each LSA received in the one packet. */ | |
1eb8ef25 | 1685 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
718e3744 | 1686 | { |
1687 | struct ospf_lsa *ls_ret, *current; | |
1688 | int ret = 1; | |
1689 | ||
718e3744 | 1690 | if (IS_DEBUG_OSPF_NSSA) |
1691 | { | |
1692 | char buf1[INET_ADDRSTRLEN]; | |
1693 | char buf2[INET_ADDRSTRLEN]; | |
1694 | char buf3[INET_ADDRSTRLEN]; | |
1695 | ||
2a42e285 | 1696 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", |
718e3744 | 1697 | lsa->data->type, |
1698 | inet_ntop (AF_INET, &ospfh->router_id, | |
1699 | buf1, INET_ADDRSTRLEN), | |
1700 | inet_ntop (AF_INET, &lsa->data->id, | |
1701 | buf2, INET_ADDRSTRLEN), | |
1702 | inet_ntop (AF_INET, &lsa->data->adv_router, | |
1703 | buf3, INET_ADDRSTRLEN)); | |
1704 | } | |
718e3744 | 1705 | |
1706 | listnode_delete (lsas, lsa); /* We don't need it in list anymore */ | |
1707 | ||
1708 | /* Validate Checksum - Done above by ospf_ls_upd_list_lsa() */ | |
1709 | ||
1710 | /* LSA Type - Done above by ospf_ls_upd_list_lsa() */ | |
1711 | ||
1712 | /* Do not take in AS External LSAs if we are a stub or NSSA. */ | |
1713 | ||
1714 | /* Do not take in AS NSSA if this neighbor and we are not NSSA */ | |
1715 | ||
1716 | /* Do take in Type-7's if we are an NSSA */ | |
1717 | ||
1718 | /* If we are also an ABR, later translate them to a Type-5 packet */ | |
1719 | ||
1720 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1721 | translate them to a separate Type-5 packet. */ | |
1722 | ||
1723 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1724 | /* Reject from STUB or NSSA */ | |
1725 | if (nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1726 | { | |
1727 | DISCARD_LSA (lsa, 1); | |
718e3744 | 1728 | if (IS_DEBUG_OSPF_NSSA) |
2a42e285 | 1729 | zlog_debug("Incoming External LSA Discarded: We are NSSA/STUB Area"); |
718e3744 | 1730 | } |
1731 | ||
718e3744 | 1732 | if (lsa->data->type == OSPF_AS_NSSA_LSA) |
1733 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) | |
1734 | { | |
1735 | DISCARD_LSA (lsa,2); | |
1736 | if (IS_DEBUG_OSPF_NSSA) | |
2a42e285 | 1737 | zlog_debug("Incoming NSSA LSA Discarded: Not NSSA Area"); |
718e3744 | 1738 | } |
718e3744 | 1739 | |
1740 | /* Find the LSA in the current database. */ | |
1741 | ||
1742 | current = ospf_lsa_lookup_by_header (oi->area, lsa->data); | |
1743 | ||
1744 | /* If the LSA's LS age is equal to MaxAge, and there is currently | |
1745 | no instance of the LSA in the router's link state database, | |
1746 | and none of router's neighbors are in states Exchange or Loading, | |
1747 | then take the following actions. */ | |
1748 | ||
1749 | if (IS_LSA_MAXAGE (lsa) && !current && | |
68980084 | 1750 | (ospf_nbr_count (oi, NSM_Exchange) + |
1751 | ospf_nbr_count (oi, NSM_Loading)) == 0) | |
718e3744 | 1752 | { |
1753 | /* Response Link State Acknowledgment. */ | |
1754 | ospf_ls_ack_send (nbr, lsa); | |
1755 | ||
1756 | /* Discard LSA. */ | |
6d45276f | 1757 | zlog_info ("Link State Update[%s]: LS age is equal to MaxAge.", |
1758 | dump_lsa_key(lsa)); | |
718e3744 | 1759 | DISCARD_LSA (lsa, 3); |
1760 | } | |
1761 | ||
1762 | #ifdef HAVE_OPAQUE_LSA | |
1763 | if (IS_OPAQUE_LSA (lsa->data->type) | |
68980084 | 1764 | && IPV4_ADDR_SAME (&lsa->data->adv_router, &oi->ospf->router_id)) |
718e3744 | 1765 | { |
1766 | /* | |
1767 | * Even if initial flushing seems to be completed, there might | |
1768 | * be a case that self-originated LSA with MaxAge still remain | |
1769 | * in the routing domain. | |
1770 | * Just send an LSAck message to cease retransmission. | |
1771 | */ | |
1772 | if (IS_LSA_MAXAGE (lsa)) | |
1773 | { | |
1774 | zlog_warn ("LSA[%s]: Boomerang effect?", dump_lsa_key (lsa)); | |
1775 | ospf_ls_ack_send (nbr, lsa); | |
1776 | ospf_lsa_discard (lsa); | |
1777 | ||
1778 | if (current != NULL && ! IS_LSA_MAXAGE (current)) | |
1779 | ospf_opaque_lsa_refresh_schedule (current); | |
1780 | continue; | |
1781 | } | |
1782 | ||
1783 | /* | |
1784 | * If an instance of self-originated Opaque-LSA is not found | |
1785 | * in the LSDB, there are some possible cases here. | |
1786 | * | |
1787 | * 1) This node lost opaque-capability after restart. | |
1788 | * 2) Else, a part of opaque-type is no more supported. | |
1789 | * 3) Else, a part of opaque-id is no more supported. | |
1790 | * | |
1791 | * Anyway, it is still this node's responsibility to flush it. | |
1792 | * Otherwise, the LSA instance remains in the routing domain | |
1793 | * until its age reaches to MaxAge. | |
1794 | */ | |
69310a67 | 1795 | /* XXX: We should deal with this for *ALL* LSAs, not just opaque */ |
718e3744 | 1796 | if (current == NULL) |
1797 | { | |
1798 | if (IS_DEBUG_OSPF_EVENT) | |
69310a67 | 1799 | zlog_debug ("LSA[%s]: Previously originated Opaque-LSA," |
1800 | "not found in the LSDB.", dump_lsa_key (lsa)); | |
718e3744 | 1801 | |
1802 | SET_FLAG (lsa->flags, OSPF_LSA_SELF); | |
69310a67 | 1803 | |
1804 | ospf_opaque_self_originated_lsa_received (nbr, lsa); | |
1805 | ospf_ls_ack_send (nbr, lsa); | |
1806 | ||
718e3744 | 1807 | continue; |
1808 | } | |
1809 | } | |
1810 | #endif /* HAVE_OPAQUE_LSA */ | |
69310a67 | 1811 | |
cb05eb28 | 1812 | /* It might be happen that received LSA is self-originated network LSA, but |
1813 | * router ID is cahnged. So, we should check if LSA is a network-LSA whose | |
1814 | * Link State ID is one of the router's own IP interface addresses but whose | |
1815 | * Advertising Router is not equal to the router's own Router ID | |
1816 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be flushed. | |
1817 | */ | |
1818 | ||
1819 | if(lsa->data->type == OSPF_NETWORK_LSA) | |
1820 | { | |
1eb8ef25 | 1821 | struct listnode *oinode, *oinnode; |
1822 | struct ospf_interface *out_if; | |
cb05eb28 | 1823 | int Flag = 0; |
1824 | ||
1eb8ef25 | 1825 | for (ALL_LIST_ELEMENTS (oi->ospf->oiflist, oinode, oinnode, out_if)) |
cb05eb28 | 1826 | { |
cb05eb28 | 1827 | if(out_if == NULL) |
1828 | break; | |
1829 | ||
1830 | if((IPV4_ADDR_SAME(&out_if->address->u.prefix4, &lsa->data->id)) && | |
1831 | (!(IPV4_ADDR_SAME(&oi->ospf->router_id, &lsa->data->adv_router)))) | |
1832 | { | |
1833 | if(out_if->network_lsa_self) | |
1834 | { | |
1835 | ospf_lsa_flush_area(lsa,out_if->area); | |
1836 | if(IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1837 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", |
cb05eb28 | 1838 | lsa, (int) lsa->data->type); |
1839 | ospf_lsa_discard (lsa); | |
1840 | Flag = 1; | |
1841 | } | |
1842 | break; | |
1843 | } | |
1844 | } | |
1845 | if(Flag) | |
1846 | continue; | |
1847 | } | |
718e3744 | 1848 | |
1849 | /* (5) Find the instance of this LSA that is currently contained | |
1850 | in the router's link state database. If there is no | |
1851 | database copy, or the received LSA is more recent than | |
1852 | the database copy the following steps must be performed. */ | |
1853 | ||
1854 | if (current == NULL || | |
1855 | (ret = ospf_lsa_more_recent (current, lsa)) < 0) | |
1856 | { | |
1857 | /* Actual flooding procedure. */ | |
68980084 | 1858 | if (ospf_flood (oi->ospf, nbr, current, lsa) < 0) /* Trap NSSA later. */ |
718e3744 | 1859 | DISCARD_LSA (lsa, 4); |
1860 | continue; | |
1861 | } | |
1862 | ||
1863 | /* (6) Else, If there is an instance of the LSA on the sending | |
1864 | neighbor's Link state request list, an error has occurred in | |
1865 | the Database Exchange process. In this case, restart the | |
1866 | Database Exchange process by generating the neighbor event | |
1867 | BadLSReq for the sending neighbor and stop processing the | |
1868 | Link State Update packet. */ | |
1869 | ||
1870 | if (ospf_ls_request_lookup (nbr, lsa)) | |
1871 | { | |
1872 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
3aa8d5f9 | 1873 | zlog_warn("LSA[%s] instance exists on Link state request list", |
1874 | dump_lsa_key(lsa)); | |
718e3744 | 1875 | |
1876 | /* Clean list of LSAs. */ | |
1877 | ospf_upd_list_clean (lsas); | |
1878 | /* this lsa is not on lsas list already. */ | |
1879 | ospf_lsa_discard (lsa); | |
718e3744 | 1880 | return; |
1881 | } | |
1882 | ||
1883 | /* If the received LSA is the same instance as the database copy | |
1884 | (i.e., neither one is more recent) the following two steps | |
1885 | should be performed: */ | |
1886 | ||
1887 | if (ret == 0) | |
1888 | { | |
1889 | /* If the LSA is listed in the Link state retransmission list | |
1890 | for the receiving adjacency, the router itself is expecting | |
1891 | an acknowledgment for this LSA. The router should treat the | |
1892 | received LSA as an acknowledgment by removing the LSA from | |
1893 | the Link state retransmission list. This is termed an | |
1894 | "implied acknowledgment". */ | |
1895 | ||
1896 | ls_ret = ospf_ls_retransmit_lookup (nbr, lsa); | |
1897 | ||
1898 | if (ls_ret != NULL) | |
1899 | { | |
1900 | ospf_ls_retransmit_delete (nbr, ls_ret); | |
1901 | ||
1902 | /* Delayed acknowledgment sent if advertisement received | |
1903 | from Designated Router, otherwise do nothing. */ | |
1904 | if (oi->state == ISM_Backup) | |
1905 | if (NBR_IS_DR (nbr)) | |
1906 | listnode_add (oi->ls_ack, ospf_lsa_lock (lsa)); | |
1907 | ||
1908 | DISCARD_LSA (lsa, 5); | |
1909 | } | |
1910 | else | |
1911 | /* Acknowledge the receipt of the LSA by sending a | |
1912 | Link State Acknowledgment packet back out the receiving | |
1913 | interface. */ | |
1914 | { | |
1915 | ospf_ls_ack_send (nbr, lsa); | |
1916 | DISCARD_LSA (lsa, 6); | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | /* The database copy is more recent. If the database copy | |
1921 | has LS age equal to MaxAge and LS sequence number equal to | |
1922 | MaxSequenceNumber, simply discard the received LSA without | |
1923 | acknowledging it. (In this case, the LSA's LS sequence number is | |
1924 | wrapping, and the MaxSequenceNumber LSA must be completely | |
1925 | flushed before any new LSA instance can be introduced). */ | |
1926 | ||
1927 | else if (ret > 0) /* Database copy is more recent */ | |
1928 | { | |
1929 | if (IS_LSA_MAXAGE (current) && | |
1930 | current->data->ls_seqnum == htonl (OSPF_MAX_SEQUENCE_NUMBER)) | |
1931 | { | |
1932 | DISCARD_LSA (lsa, 7); | |
1933 | } | |
1934 | /* Otherwise, as long as the database copy has not been sent in a | |
1935 | Link State Update within the last MinLSArrival seconds, send the | |
1936 | database copy back to the sending neighbor, encapsulated within | |
1937 | a Link State Update Packet. The Link State Update Packet should | |
1938 | be sent directly to the neighbor. In so doing, do not put the | |
1939 | database copy of the LSA on the neighbor's link state | |
1940 | retransmission list, and do not acknowledge the received (less | |
1941 | recent) LSA instance. */ | |
1942 | else | |
1943 | { | |
1944 | struct timeval now; | |
1945 | ||
2518efd1 | 1946 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &now); |
718e3744 | 1947 | |
1948 | if (tv_cmp (tv_sub (now, current->tv_orig), | |
1949 | int2tv (OSPF_MIN_LS_ARRIVAL)) > 0) | |
1950 | /* Trap NSSA type later.*/ | |
1951 | ospf_ls_upd_send_lsa (nbr, current, OSPF_SEND_PACKET_DIRECT); | |
1952 | DISCARD_LSA (lsa, 8); | |
1953 | } | |
1954 | } | |
1955 | } | |
1956 | ||
718e3744 | 1957 | assert (listcount (lsas) == 0); |
1958 | list_delete (lsas); | |
1959 | } | |
1960 | ||
1961 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
4dadc291 | 1962 | static void |
718e3744 | 1963 | ospf_ls_ack (struct ip *iph, struct ospf_header *ospfh, |
1964 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1965 | { | |
1966 | struct ospf_neighbor *nbr; | |
69310a67 | 1967 | |
718e3744 | 1968 | /* increment statistics. */ |
1969 | oi->ls_ack_in++; | |
1970 | ||
d3f0d621 | 1971 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1972 | if (nbr == NULL) |
1973 | { | |
1974 | zlog_warn ("Link State Acknowledgment: Unknown Neighbor %s.", | |
1975 | inet_ntoa (ospfh->router_id)); | |
1976 | return; | |
1977 | } | |
1978 | ||
1979 | if (nbr->state < NSM_Exchange) | |
1980 | { | |
3aa8d5f9 | 1981 | zlog_warn ("Link State Acknowledgment: " |
1982 | "Neighbor[%s] state %s is less than Exchange", | |
1983 | inet_ntoa (ospfh->router_id), | |
1984 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 1985 | return; |
1986 | } | |
69310a67 | 1987 | |
718e3744 | 1988 | while (size >= OSPF_LSA_HEADER_SIZE) |
1989 | { | |
1990 | struct ospf_lsa *lsa, *lsr; | |
1991 | ||
1992 | lsa = ospf_lsa_new (); | |
1993 | lsa->data = (struct lsa_header *) STREAM_PNT (s); | |
1994 | ||
1995 | /* lsah = (struct lsa_header *) STREAM_PNT (s); */ | |
1996 | size -= OSPF_LSA_HEADER_SIZE; | |
9985f83c | 1997 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 1998 | |
1999 | if (lsa->data->type < OSPF_MIN_LSA || lsa->data->type >= OSPF_MAX_LSA) | |
2000 | { | |
2001 | lsa->data = NULL; | |
2002 | ospf_lsa_discard (lsa); | |
2003 | continue; | |
2004 | } | |
2005 | ||
2006 | lsr = ospf_ls_retransmit_lookup (nbr, lsa); | |
2007 | ||
2008 | if (lsr != NULL && lsr->data->ls_seqnum == lsa->data->ls_seqnum) | |
2009 | { | |
2010 | #ifdef HAVE_OPAQUE_LSA | |
718e3744 | 2011 | if (IS_OPAQUE_LSA (lsr->data->type)) |
69310a67 | 2012 | ospf_opaque_ls_ack_received (nbr, lsr); |
718e3744 | 2013 | #endif /* HAVE_OPAQUE_LSA */ |
2014 | ||
2015 | ospf_ls_retransmit_delete (nbr, lsr); | |
2016 | } | |
2017 | ||
2018 | lsa->data = NULL; | |
2019 | ospf_lsa_discard (lsa); | |
2020 | } | |
2021 | ||
718e3744 | 2022 | return; |
718e3744 | 2023 | } |
2024 | \f | |
038163fa | 2025 | static struct stream * |
5c33349b | 2026 | ospf_recv_packet (int fd, struct interface **ifp, struct stream *ibuf) |
718e3744 | 2027 | { |
2028 | int ret; | |
5c33349b | 2029 | struct ip *iph; |
718e3744 | 2030 | u_int16_t ip_len; |
718e3744 | 2031 | unsigned int ifindex = 0; |
2032 | struct iovec iov; | |
d0deca68 | 2033 | /* Header and data both require alignment. */ |
e304982e | 2034 | char buff [CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; |
2dd8bb4e | 2035 | struct msghdr msgh; |
2036 | ||
68defd6d | 2037 | memset (&msgh, 0, sizeof (struct msghdr)); |
2dd8bb4e | 2038 | msgh.msg_iov = &iov; |
2039 | msgh.msg_iovlen = 1; | |
2040 | msgh.msg_control = (caddr_t) buff; | |
2041 | msgh.msg_controllen = sizeof (buff); | |
2dd8bb4e | 2042 | |
5c33349b | 2043 | ret = stream_recvmsg (ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE+1); |
2044 | if (ret < 0) | |
718e3744 | 2045 | { |
5c33349b | 2046 | zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno)); |
2047 | return NULL; | |
2048 | } | |
69310a67 | 2049 | if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */ |
5c33349b | 2050 | { |
2051 | zlog_warn("ospf_recv_packet: discarding runt packet of length %d " | |
2052 | "(ip header size is %u)", | |
2053 | ret, (u_int)sizeof(iph)); | |
718e3744 | 2054 | return NULL; |
2055 | } | |
18b12c38 | 2056 | |
5c33349b | 2057 | /* Note that there should not be alignment problems with this assignment |
2058 | because this is at the beginning of the stream data buffer. */ | |
2059 | iph = (struct ip *) STREAM_DATA(ibuf); | |
2060 | sockopt_iphdrincl_swab_systoh (iph); | |
18b12c38 | 2061 | |
5c33349b | 2062 | ip_len = iph->ip_len; |
6b333611 | 2063 | |
239aecc0 | 2064 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) |
718e3744 | 2065 | /* |
2066 | * Kernel network code touches incoming IP header parameters, | |
2067 | * before protocol specific processing. | |
2068 | * | |
2069 | * 1) Convert byteorder to host representation. | |
2070 | * --> ip_len, ip_id, ip_off | |
2071 | * | |
2072 | * 2) Adjust ip_len to strip IP header size! | |
2073 | * --> If user process receives entire IP packet via RAW | |
2074 | * socket, it must consider adding IP header size to | |
2075 | * the "ip_len" field of "ip" structure. | |
2076 | * | |
2077 | * For more details, see <netinet/ip_input.c>. | |
2078 | */ | |
5c33349b | 2079 | ip_len = ip_len + (iph->ip_hl << 2); |
718e3744 | 2080 | #endif |
2081 | ||
863082d5 | 2082 | ifindex = getsockopt_ifindex (AF_INET, &msgh); |
718e3744 | 2083 | |
2084 | *ifp = if_lookup_by_index (ifindex); | |
2085 | ||
2086 | if (ret != ip_len) | |
2087 | { | |
5c33349b | 2088 | zlog_warn ("ospf_recv_packet read length mismatch: ip_len is %d, " |
2089 | "but recvmsg returned %d", ip_len, ret); | |
718e3744 | 2090 | return NULL; |
2091 | } | |
2092 | ||
2093 | return ibuf; | |
2094 | } | |
2095 | ||
4dadc291 | 2096 | static struct ospf_interface * |
d3f0d621 | 2097 | ospf_associate_packet_vl (struct ospf *ospf, struct interface *ifp, |
718e3744 | 2098 | struct ip *iph, struct ospf_header *ospfh) |
2099 | { | |
2100 | struct ospf_interface *rcv_oi; | |
718e3744 | 2101 | struct ospf_vl_data *vl_data; |
2102 | struct ospf_area *vl_area; | |
52dc7ee6 | 2103 | struct listnode *node; |
718e3744 | 2104 | |
2105 | if (IN_MULTICAST (ntohl (iph->ip_dst.s_addr)) || | |
2106 | !OSPF_IS_AREA_BACKBONE (ospfh)) | |
d3f0d621 | 2107 | return NULL; |
718e3744 | 2108 | |
d3f0d621 | 2109 | /* look for local OSPF interface matching the destination |
2110 | * to determine Area ID. We presume therefore the destination address | |
2111 | * is unique, or at least (for "unnumbered" links), not used in other | |
2112 | * areas | |
2113 | */ | |
2114 | if ((rcv_oi = ospf_if_lookup_by_local_addr (ospf, NULL, | |
2115 | iph->ip_dst)) == NULL) | |
2116 | return NULL; | |
718e3744 | 2117 | |
1eb8ef25 | 2118 | for (ALL_LIST_ELEMENTS_RO (ospf->vlinks, node, vl_data)) |
718e3744 | 2119 | { |
020709f9 | 2120 | vl_area = ospf_area_lookup_by_area_id (ospf, vl_data->vl_area_id); |
718e3744 | 2121 | if (!vl_area) |
2122 | continue; | |
2123 | ||
2124 | if (OSPF_AREA_SAME (&vl_area, &rcv_oi->area) && | |
2125 | IPV4_ADDR_SAME (&vl_data->vl_peer, &ospfh->router_id)) | |
2126 | { | |
2127 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2128 | zlog_debug ("associating packet with %s", |
718e3744 | 2129 | IF_NAME (vl_data->vl_oi)); |
2130 | if (! CHECK_FLAG (vl_data->vl_oi->ifp->flags, IFF_UP)) | |
2131 | { | |
2132 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2133 | zlog_debug ("This VL is not up yet, sorry"); |
718e3744 | 2134 | return NULL; |
2135 | } | |
2136 | ||
2137 | return vl_data->vl_oi; | |
2138 | } | |
2139 | } | |
2140 | ||
2141 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2142 | zlog_debug ("couldn't find any VL to associate the packet with"); |
718e3744 | 2143 | |
d3f0d621 | 2144 | return NULL; |
718e3744 | 2145 | } |
2146 | ||
4dadc291 | 2147 | static inline int |
718e3744 | 2148 | ospf_check_area_id (struct ospf_interface *oi, struct ospf_header *ospfh) |
2149 | { | |
2150 | /* Check match the Area ID of the receiving interface. */ | |
2151 | if (OSPF_AREA_SAME (&oi->area, &ospfh)) | |
2152 | return 1; | |
2153 | ||
2154 | return 0; | |
2155 | } | |
2156 | ||
2157 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2158 | To prevent it, compare src IP address and i/f address with masking | |
2159 | i/f network mask. */ | |
4dadc291 | 2160 | static int |
718e3744 | 2161 | ospf_check_network_mask (struct ospf_interface *oi, struct in_addr ip_src) |
2162 | { | |
2163 | struct in_addr mask, me, him; | |
2164 | ||
2165 | if (oi->type == OSPF_IFTYPE_POINTOPOINT || | |
2166 | oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2167 | return 1; | |
2168 | ||
2169 | masklen2ip (oi->address->prefixlen, &mask); | |
2170 | ||
2171 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
2172 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
2173 | ||
2174 | if (IPV4_ADDR_SAME (&me, &him)) | |
2175 | return 1; | |
2176 | ||
2177 | return 0; | |
2178 | } | |
2179 | ||
4dadc291 | 2180 | static int |
718e3744 | 2181 | ospf_check_auth (struct ospf_interface *oi, struct stream *ibuf, |
2182 | struct ospf_header *ospfh) | |
2183 | { | |
2184 | int ret = 0; | |
2185 | struct crypt_key *ck; | |
2186 | ||
2187 | switch (ntohs (ospfh->auth_type)) | |
2188 | { | |
2189 | case OSPF_AUTH_NULL: | |
2190 | ret = 1; | |
2191 | break; | |
2192 | case OSPF_AUTH_SIMPLE: | |
2193 | if (!memcmp (OSPF_IF_PARAM (oi, auth_simple), ospfh->u.auth_data, OSPF_AUTH_SIMPLE_SIZE)) | |
2194 | ret = 1; | |
2195 | else | |
2196 | ret = 0; | |
2197 | break; | |
2198 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
1eb8ef25 | 2199 | if ((ck = listgetdata (listtail(OSPF_IF_PARAM (oi,auth_crypt)))) == NULL) |
718e3744 | 2200 | { |
2201 | ret = 0; | |
2202 | break; | |
2203 | } | |
2204 | ||
2205 | /* This is very basic, the digest processing is elsewhere */ | |
2206 | if (ospfh->u.crypt.auth_data_len == OSPF_AUTH_MD5_SIZE && | |
2207 | ospfh->u.crypt.key_id == ck->key_id && | |
2208 | ntohs (ospfh->length) + OSPF_AUTH_SIMPLE_SIZE <= stream_get_size (ibuf)) | |
2209 | ret = 1; | |
2210 | else | |
2211 | ret = 0; | |
2212 | break; | |
2213 | default: | |
2214 | ret = 0; | |
2215 | break; | |
2216 | } | |
2217 | ||
2218 | return ret; | |
2219 | } | |
2220 | ||
4dadc291 | 2221 | static int |
718e3744 | 2222 | ospf_check_sum (struct ospf_header *ospfh) |
2223 | { | |
2224 | u_int32_t ret; | |
2225 | u_int16_t sum; | |
718e3744 | 2226 | |
2227 | /* clear auth_data for checksum. */ | |
2228 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2229 | ||
2230 | /* keep checksum and clear. */ | |
2231 | sum = ospfh->checksum; | |
2232 | memset (&ospfh->checksum, 0, sizeof (u_int16_t)); | |
2233 | ||
2234 | /* calculate checksum. */ | |
2235 | ret = in_cksum (ospfh, ntohs (ospfh->length)); | |
2236 | ||
2237 | if (ret != sum) | |
2238 | { | |
2239 | zlog_info ("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2240 | ret, sum); | |
2241 | return 0; | |
2242 | } | |
2243 | ||
2244 | return 1; | |
2245 | } | |
2246 | ||
2247 | /* OSPF Header verification. */ | |
4dadc291 | 2248 | static int |
718e3744 | 2249 | ospf_verify_header (struct stream *ibuf, struct ospf_interface *oi, |
2250 | struct ip *iph, struct ospf_header *ospfh) | |
2251 | { | |
2252 | /* check version. */ | |
2253 | if (ospfh->version != OSPF_VERSION) | |
2254 | { | |
2255 | zlog_warn ("interface %s: ospf_read version number mismatch.", | |
2256 | IF_NAME (oi)); | |
2257 | return -1; | |
2258 | } | |
2259 | ||
2260 | /* Check Area ID. */ | |
2261 | if (!ospf_check_area_id (oi, ospfh)) | |
2262 | { | |
2263 | zlog_warn ("interface %s: ospf_read invalid Area ID %s.", | |
2264 | IF_NAME (oi), inet_ntoa (ospfh->area_id)); | |
2265 | return -1; | |
2266 | } | |
2267 | ||
2268 | /* Check network mask, Silently discarded. */ | |
2269 | if (! ospf_check_network_mask (oi, iph->ip_src)) | |
2270 | { | |
2271 | zlog_warn ("interface %s: ospf_read network address is not same [%s]", | |
2272 | IF_NAME (oi), inet_ntoa (iph->ip_src)); | |
2273 | return -1; | |
2274 | } | |
2275 | ||
2276 | /* Check authentication. */ | |
2277 | if (ospf_auth_type (oi) != ntohs (ospfh->auth_type)) | |
2278 | { | |
c6371718 | 2279 | zlog_warn ("interface %s: auth-type mismatch, local %d, rcvd %d", |
2280 | IF_NAME (oi), ospf_auth_type (oi), ntohs (ospfh->auth_type)); | |
718e3744 | 2281 | return -1; |
2282 | } | |
2283 | ||
2284 | if (! ospf_check_auth (oi, ibuf, ospfh)) | |
2285 | { | |
2286 | zlog_warn ("interface %s: ospf_read authentication failed.", | |
2287 | IF_NAME (oi)); | |
2288 | return -1; | |
2289 | } | |
2290 | ||
2291 | /* if check sum is invalid, packet is discarded. */ | |
2292 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2293 | { | |
2294 | if (! ospf_check_sum (ospfh)) | |
2295 | { | |
2296 | zlog_warn ("interface %s: ospf_read packet checksum error %s", | |
2297 | IF_NAME (oi), inet_ntoa (ospfh->router_id)); | |
2298 | return -1; | |
2299 | } | |
2300 | } | |
2301 | else | |
2302 | { | |
2303 | if (ospfh->checksum != 0) | |
2304 | return -1; | |
2305 | if (ospf_check_md5_digest (oi, ibuf, ntohs (ospfh->length)) == 0) | |
2306 | { | |
2307 | zlog_warn ("interface %s: ospf_read md5 authentication failed.", | |
2308 | IF_NAME (oi)); | |
2309 | return -1; | |
2310 | } | |
2311 | } | |
2312 | ||
2313 | return 0; | |
2314 | } | |
2315 | ||
2316 | /* Starting point of packet process function. */ | |
2317 | int | |
2318 | ospf_read (struct thread *thread) | |
2319 | { | |
2320 | int ret; | |
2321 | struct stream *ibuf; | |
68980084 | 2322 | struct ospf *ospf; |
718e3744 | 2323 | struct ospf_interface *oi; |
2324 | struct ip *iph; | |
2325 | struct ospf_header *ospfh; | |
2326 | u_int16_t length; | |
2327 | struct interface *ifp; | |
2328 | ||
2329 | /* first of all get interface pointer. */ | |
68980084 | 2330 | ospf = THREAD_ARG (thread); |
038163fa | 2331 | |
2332 | /* prepare for next packet. */ | |
2333 | ospf->t_read = thread_add_read (master, ospf_read, ospf, ospf->fd); | |
718e3744 | 2334 | |
2335 | /* read OSPF packet. */ | |
5c33349b | 2336 | stream_reset(ospf->ibuf); |
2337 | if (!(ibuf = ospf_recv_packet (ospf->fd, &ifp, ospf->ibuf))) | |
718e3744 | 2338 | return -1; |
2339 | ||
5c33349b | 2340 | /* Note that there should not be alignment problems with this assignment |
2341 | because this is at the beginning of the stream data buffer. */ | |
06f953f7 | 2342 | iph = (struct ip *) STREAM_DATA (ibuf); |
5c33349b | 2343 | /* Note that sockopt_iphdrincl_swab_systoh was called in ospf_recv_packet. */ |
06f953f7 | 2344 | |
ac191232 | 2345 | if (ifp == NULL) |
b87f772a | 2346 | /* Handle cases where the platform does not support retrieving the ifindex, |
2347 | and also platforms (such as Solaris 8) that claim to support ifindex | |
2348 | retrieval but do not. */ | |
ac191232 | 2349 | ifp = if_lookup_address (iph->ip_src); |
ac191232 | 2350 | |
d3f0d621 | 2351 | if (ifp == NULL) |
5c33349b | 2352 | return 0; |
718e3744 | 2353 | |
2354 | /* IP Header dump. */ | |
17b78d38 | 2355 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) |
6b333611 | 2356 | ospf_ip_header_dump (iph); |
7d95c611 | 2357 | |
718e3744 | 2358 | /* Self-originated packet should be discarded silently. */ |
68980084 | 2359 | if (ospf_if_lookup_by_local_addr (ospf, NULL, iph->ip_src)) |
718e3744 | 2360 | { |
d324181c | 2361 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) |
2362 | { | |
2a42e285 | 2363 | zlog_debug ("ospf_read[%s]: Dropping self-originated packet", |
d324181c | 2364 | inet_ntoa (iph->ip_src)); |
2365 | } | |
718e3744 | 2366 | return 0; |
2367 | } | |
2368 | ||
2369 | /* Adjust size to message length. */ | |
9985f83c | 2370 | stream_forward_getp (ibuf, iph->ip_hl * 4); |
718e3744 | 2371 | |
2372 | /* Get ospf packet header. */ | |
2373 | ospfh = (struct ospf_header *) STREAM_PNT (ibuf); | |
2374 | ||
2375 | /* associate packet with ospf interface */ | |
68980084 | 2376 | oi = ospf_if_lookup_recv_if (ospf, iph->ip_src); |
d3f0d621 | 2377 | |
491eddc2 JT |
2378 | /* If incoming interface is passive one, ignore it. */ |
2379 | if (oi && OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) | |
2380 | { | |
2381 | char buf[3][INET_ADDRSTRLEN]; | |
2382 | ||
2383 | if (IS_DEBUG_OSPF_EVENT) | |
2384 | zlog_debug ("ignoring packet from router %s sent to %s, " | |
2385 | "received on a passive interface, %s", | |
2386 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], sizeof(buf[0])), | |
2387 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2388 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
2389 | buf[2], sizeof(buf[2]))); | |
2390 | ||
2391 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
2392 | { | |
2393 | /* Try to fix multicast membership. | |
2394 | * Some OS:es may have problems in this area, | |
2395 | * make sure it is removed. | |
2396 | */ | |
2397 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
2398 | ospf_if_set_multicast(oi); | |
2399 | } | |
2400 | return 0; | |
2401 | } | |
2402 | ||
2403 | ||
d3f0d621 | 2404 | /* if no local ospf_interface, |
2405 | * or header area is backbone but ospf_interface is not | |
2406 | * check for VLINK interface | |
2407 | */ | |
2408 | if ( (oi == NULL) || | |
2409 | (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) | |
2410 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id)) | |
2411 | ) | |
718e3744 | 2412 | { |
d3f0d621 | 2413 | if ((oi = ospf_associate_packet_vl (ospf, ifp, iph, ospfh)) == NULL) |
d324181c | 2414 | { |
88871b1d PJ |
2415 | if (IS_DEBUG_OSPF_EVENT) |
2416 | zlog_debug ("Packet from [%s] received on link %s" | |
2417 | " but no ospf_interface", | |
2418 | inet_ntoa (iph->ip_src), ifp->name); | |
d3f0d621 | 2419 | return 0; |
d324181c | 2420 | } |
d3f0d621 | 2421 | } |
2422 | ||
2423 | /* else it must be a local ospf interface, check it was received on | |
2424 | * correct link | |
2425 | */ | |
2426 | else if (oi->ifp != ifp) | |
2427 | { | |
2428 | zlog_warn ("Packet from [%s] received on wrong link %s", | |
2429 | inet_ntoa (iph->ip_src), ifp->name); | |
718e3744 | 2430 | return 0; |
2431 | } | |
847947f2 | 2432 | else if (oi->state == ISM_Down) |
c3eab871 | 2433 | { |
ba6454ec | 2434 | char buf[2][INET_ADDRSTRLEN]; |
2435 | zlog_warn ("Ignoring packet from %s to %s received on interface that is " | |
847947f2 | 2436 | "down [%s]; interface flags are %s", |
ba6454ec | 2437 | inet_ntop(AF_INET, &iph->ip_src, buf[0], sizeof(buf[0])), |
2438 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2439 | ifp->name, if_flag_dump(ifp->flags)); | |
ba6454ec | 2440 | /* Fix multicast memberships? */ |
2441 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
429ac78c | 2442 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); |
ba6454ec | 2443 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) |
429ac78c | 2444 | OI_MEMBER_JOINED(oi, MEMBER_DROUTERS); |
ba6454ec | 2445 | if (oi->multicast_memberships) |
2446 | ospf_if_set_multicast(oi); | |
c3eab871 | 2447 | return 0; |
2448 | } | |
718e3744 | 2449 | |
2450 | /* | |
2451 | * If the received packet is destined for AllDRouters, the packet | |
2452 | * should be accepted only if the received ospf interface state is | |
2453 | * either DR or Backup -- endo. | |
2454 | */ | |
2455 | if (iph->ip_dst.s_addr == htonl (OSPF_ALLDROUTERS) | |
2456 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) | |
2457 | { | |
ba6454ec | 2458 | zlog_warn ("Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", |
718e3744 | 2459 | inet_ntoa (iph->ip_src), IF_NAME (oi), |
2460 | LOOKUP (ospf_ism_state_msg, oi->state)); | |
ba6454ec | 2461 | /* Try to fix multicast membership. */ |
2462 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
2463 | ospf_if_set_multicast(oi); | |
718e3744 | 2464 | return 0; |
2465 | } | |
2466 | ||
2467 | /* Show debug receiving packet. */ | |
1aa7b399 | 2468 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2469 | { | |
718e3744 | 2470 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) |
1aa7b399 | 2471 | { |
2a42e285 | 2472 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2473 | ospf_packet_dump (ibuf); |
2474 | } | |
718e3744 | 2475 | |
2a42e285 | 2476 | zlog_debug ("%s received from [%s] via [%s]", |
1aa7b399 | 2477 | ospf_packet_type_str[ospfh->type], |
2478 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); | |
2a42e285 | 2479 | zlog_debug (" src [%s],", inet_ntoa (iph->ip_src)); |
2480 | zlog_debug (" dst [%s]", inet_ntoa (iph->ip_dst)); | |
718e3744 | 2481 | |
2482 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) | |
2a42e285 | 2483 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2484 | } |
718e3744 | 2485 | |
2486 | /* Some header verification. */ | |
2487 | ret = ospf_verify_header (ibuf, oi, iph, ospfh); | |
2488 | if (ret < 0) | |
2489 | { | |
d324181c | 2490 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2491 | { | |
2a42e285 | 2492 | zlog_debug ("ospf_read[%s/%s]: Header check failed, " |
d324181c | 2493 | "dropping.", |
2494 | ospf_packet_type_str[ospfh->type], | |
2495 | inet_ntoa (iph->ip_src)); | |
2496 | } | |
718e3744 | 2497 | return ret; |
2498 | } | |
2499 | ||
9985f83c | 2500 | stream_forward_getp (ibuf, OSPF_HEADER_SIZE); |
718e3744 | 2501 | |
2502 | /* Adjust size to message length. */ | |
2503 | length = ntohs (ospfh->length) - OSPF_HEADER_SIZE; | |
2504 | ||
2505 | /* Read rest of the packet and call each sort of packet routine. */ | |
2506 | switch (ospfh->type) | |
2507 | { | |
2508 | case OSPF_MSG_HELLO: | |
2509 | ospf_hello (iph, ospfh, ibuf, oi, length); | |
2510 | break; | |
2511 | case OSPF_MSG_DB_DESC: | |
2512 | ospf_db_desc (iph, ospfh, ibuf, oi, length); | |
2513 | break; | |
2514 | case OSPF_MSG_LS_REQ: | |
2515 | ospf_ls_req (iph, ospfh, ibuf, oi, length); | |
2516 | break; | |
2517 | case OSPF_MSG_LS_UPD: | |
2518 | ospf_ls_upd (iph, ospfh, ibuf, oi, length); | |
2519 | break; | |
2520 | case OSPF_MSG_LS_ACK: | |
2521 | ospf_ls_ack (iph, ospfh, ibuf, oi, length); | |
2522 | break; | |
2523 | default: | |
2524 | zlog (NULL, LOG_WARNING, | |
2525 | "interface %s: OSPF packet header type %d is illegal", | |
2526 | IF_NAME (oi), ospfh->type); | |
2527 | break; | |
2528 | } | |
2529 | ||
718e3744 | 2530 | return 0; |
2531 | } | |
2532 | ||
2533 | /* Make OSPF header. */ | |
4dadc291 | 2534 | static void |
718e3744 | 2535 | ospf_make_header (int type, struct ospf_interface *oi, struct stream *s) |
2536 | { | |
2537 | struct ospf_header *ospfh; | |
2538 | ||
2539 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
2540 | ||
2541 | ospfh->version = (u_char) OSPF_VERSION; | |
2542 | ospfh->type = (u_char) type; | |
2543 | ||
68980084 | 2544 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 2545 | |
2546 | ospfh->checksum = 0; | |
2547 | ospfh->area_id = oi->area->area_id; | |
2548 | ospfh->auth_type = htons (ospf_auth_type (oi)); | |
2549 | ||
2550 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2551 | ||
9985f83c | 2552 | stream_forward_endp (s, OSPF_HEADER_SIZE); |
718e3744 | 2553 | } |
2554 | ||
2555 | /* Make Authentication Data. */ | |
4dadc291 | 2556 | static int |
718e3744 | 2557 | ospf_make_auth (struct ospf_interface *oi, struct ospf_header *ospfh) |
2558 | { | |
2559 | struct crypt_key *ck; | |
2560 | ||
2561 | switch (ospf_auth_type (oi)) | |
2562 | { | |
2563 | case OSPF_AUTH_NULL: | |
2564 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
2565 | break; | |
2566 | case OSPF_AUTH_SIMPLE: | |
2567 | memcpy (ospfh->u.auth_data, OSPF_IF_PARAM (oi, auth_simple), | |
2568 | OSPF_AUTH_SIMPLE_SIZE); | |
2569 | break; | |
2570 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
2571 | /* If key is not set, then set 0. */ | |
2572 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
2573 | { | |
2574 | ospfh->u.crypt.zero = 0; | |
2575 | ospfh->u.crypt.key_id = 0; | |
2576 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
2577 | } | |
2578 | else | |
2579 | { | |
1eb8ef25 | 2580 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
718e3744 | 2581 | ospfh->u.crypt.zero = 0; |
2582 | ospfh->u.crypt.key_id = ck->key_id; | |
2583 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
2584 | } | |
2585 | /* note: the seq is done in ospf_make_md5_digest() */ | |
2586 | break; | |
2587 | default: | |
2588 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
2589 | break; | |
2590 | } | |
2591 | ||
2592 | return 0; | |
2593 | } | |
2594 | ||
2595 | /* Fill rest of OSPF header. */ | |
4dadc291 | 2596 | static void |
718e3744 | 2597 | ospf_fill_header (struct ospf_interface *oi, |
2598 | struct stream *s, u_int16_t length) | |
2599 | { | |
2600 | struct ospf_header *ospfh; | |
2601 | ||
2602 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
2603 | ||
2604 | /* Fill length. */ | |
2605 | ospfh->length = htons (length); | |
2606 | ||
2607 | /* Calculate checksum. */ | |
2608 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2609 | ospfh->checksum = in_cksum (ospfh, length); | |
2610 | else | |
2611 | ospfh->checksum = 0; | |
2612 | ||
2613 | /* Add Authentication Data. */ | |
2614 | ospf_make_auth (oi, ospfh); | |
2615 | } | |
2616 | ||
4dadc291 | 2617 | static int |
718e3744 | 2618 | ospf_make_hello (struct ospf_interface *oi, struct stream *s) |
2619 | { | |
2620 | struct ospf_neighbor *nbr; | |
2621 | struct route_node *rn; | |
2622 | u_int16_t length = OSPF_HELLO_MIN_SIZE; | |
2623 | struct in_addr mask; | |
2624 | unsigned long p; | |
2625 | int flag = 0; | |
2626 | ||
2627 | /* Set netmask of interface. */ | |
2628 | if (oi->type != OSPF_IFTYPE_POINTOPOINT && | |
2629 | oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
2630 | masklen2ip (oi->address->prefixlen, &mask); | |
2631 | else | |
2632 | memset ((char *) &mask, 0, sizeof (struct in_addr)); | |
2633 | stream_put_ipv4 (s, mask.s_addr); | |
2634 | ||
2635 | /* Set Hello Interval. */ | |
f9ad937f | 2636 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) |
2637 | stream_putw (s, OSPF_IF_PARAM (oi, v_hello)); | |
2638 | else | |
2639 | stream_putw (s, 0); /* hello-interval of 0 for fast-hellos */ | |
718e3744 | 2640 | |
2641 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2642 | zlog_debug ("make_hello: options: %x, int: %s", |
718e3744 | 2643 | OPTIONS(oi), IF_NAME (oi)); |
2644 | ||
2645 | /* Set Options. */ | |
2646 | stream_putc (s, OPTIONS (oi)); | |
2647 | ||
2648 | /* Set Router Priority. */ | |
2649 | stream_putc (s, PRIORITY (oi)); | |
2650 | ||
2651 | /* Set Router Dead Interval. */ | |
2652 | stream_putl (s, OSPF_IF_PARAM (oi, v_wait)); | |
2653 | ||
2654 | /* Set Designated Router. */ | |
2655 | stream_put_ipv4 (s, DR (oi).s_addr); | |
2656 | ||
9985f83c | 2657 | p = stream_get_endp (s); |
718e3744 | 2658 | |
2659 | /* Set Backup Designated Router. */ | |
2660 | stream_put_ipv4 (s, BDR (oi).s_addr); | |
2661 | ||
2662 | /* Add neighbor seen. */ | |
2663 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
68980084 | 2664 | if ((nbr = rn->info)) |
2665 | if (nbr->router_id.s_addr != 0) /* Ignore 0.0.0.0 node. */ | |
2666 | if (nbr->state != NSM_Attempt) /* Ignore Down neighbor. */ | |
2667 | if (nbr->state != NSM_Down) /* This is myself for DR election. */ | |
2668 | if (!IPV4_ADDR_SAME (&nbr->router_id, &oi->ospf->router_id)) | |
718e3744 | 2669 | { |
2670 | /* Check neighbor is sane? */ | |
68980084 | 2671 | if (nbr->d_router.s_addr != 0 |
2672 | && IPV4_ADDR_SAME (&nbr->d_router, &oi->address->u.prefix4) | |
2673 | && IPV4_ADDR_SAME (&nbr->bd_router, &oi->address->u.prefix4)) | |
2674 | flag = 1; | |
718e3744 | 2675 | |
2676 | stream_put_ipv4 (s, nbr->router_id.s_addr); | |
2677 | length += 4; | |
2678 | } | |
2679 | ||
2680 | /* Let neighbor generate BackupSeen. */ | |
2681 | if (flag == 1) | |
3a9eb091 | 2682 | stream_putl_at (s, p, 0); /* ipv4 address, normally */ |
718e3744 | 2683 | |
2684 | return length; | |
2685 | } | |
2686 | ||
4dadc291 | 2687 | static int |
718e3744 | 2688 | ospf_make_db_desc (struct ospf_interface *oi, struct ospf_neighbor *nbr, |
2689 | struct stream *s) | |
2690 | { | |
2691 | struct ospf_lsa *lsa; | |
2692 | u_int16_t length = OSPF_DB_DESC_MIN_SIZE; | |
2693 | u_char options; | |
2694 | unsigned long pp; | |
2695 | int i; | |
2696 | struct ospf_lsdb *lsdb; | |
2697 | ||
2698 | /* Set Interface MTU. */ | |
2699 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2700 | stream_putw (s, 0); | |
2701 | else | |
2702 | stream_putw (s, oi->ifp->mtu); | |
2703 | ||
2704 | /* Set Options. */ | |
2705 | options = OPTIONS (oi); | |
2706 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 2707 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 2708 | { |
2709 | if (IS_SET_DD_I (nbr->dd_flags) | |
2710 | || CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
2711 | /* | |
2712 | * Set O-bit in the outgoing DD packet for capablity negotiation, | |
2713 | * if one of following case is applicable. | |
2714 | * | |
2715 | * 1) WaitTimer expiration event triggered the neighbor state to | |
2716 | * change to Exstart, but no (valid) DD packet has received | |
2717 | * from the neighbor yet. | |
2718 | * | |
2719 | * 2) At least one DD packet with O-bit on has received from the | |
2720 | * neighbor. | |
2721 | */ | |
2722 | SET_FLAG (options, OSPF_OPTION_O); | |
2723 | } | |
2724 | #endif /* HAVE_OPAQUE_LSA */ | |
2725 | stream_putc (s, options); | |
2726 | ||
8dd24ee6 | 2727 | /* DD flags */ |
9985f83c | 2728 | pp = stream_get_endp (s); |
718e3744 | 2729 | stream_putc (s, nbr->dd_flags); |
2730 | ||
2731 | /* Set DD Sequence Number. */ | |
2732 | stream_putl (s, nbr->dd_seqnum); | |
2733 | ||
b5aeb441 | 2734 | /* shortcut unneeded walk of (empty) summary LSDBs */ |
718e3744 | 2735 | if (ospf_db_summary_isempty (nbr)) |
b5aeb441 | 2736 | goto empty; |
718e3744 | 2737 | |
2738 | /* Describe LSA Header from Database Summary List. */ | |
2739 | lsdb = &nbr->db_sum; | |
2740 | ||
2741 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
2742 | { | |
2743 | struct route_table *table = lsdb->type[i].db; | |
2744 | struct route_node *rn; | |
2745 | ||
2746 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
2747 | if ((lsa = rn->info) != NULL) | |
2748 | { | |
2749 | #ifdef HAVE_OPAQUE_LSA | |
2750 | if (IS_OPAQUE_LSA (lsa->data->type) | |
2751 | && (! CHECK_FLAG (options, OSPF_OPTION_O))) | |
2752 | { | |
2753 | /* Suppress advertising opaque-informations. */ | |
2754 | /* Remove LSA from DB summary list. */ | |
2755 | ospf_lsdb_delete (lsdb, lsa); | |
2756 | continue; | |
2757 | } | |
2758 | #endif /* HAVE_OPAQUE_LSA */ | |
2759 | ||
2760 | if (!CHECK_FLAG (lsa->flags, OSPF_LSA_DISCARD)) | |
2761 | { | |
2762 | struct lsa_header *lsah; | |
2763 | u_int16_t ls_age; | |
2764 | ||
2765 | /* DD packet overflows interface MTU. */ | |
86f1fd96 | 2766 | if (length + OSPF_LSA_HEADER_SIZE > ospf_packet_max (oi)) |
718e3744 | 2767 | break; |
2768 | ||
2769 | /* Keep pointer to LS age. */ | |
2770 | lsah = (struct lsa_header *) (STREAM_DATA (s) + | |
9985f83c | 2771 | stream_get_endp (s)); |
718e3744 | 2772 | |
2773 | /* Proceed stream pointer. */ | |
2774 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
2775 | length += OSPF_LSA_HEADER_SIZE; | |
2776 | ||
2777 | /* Set LS age. */ | |
2778 | ls_age = LS_AGE (lsa); | |
2779 | lsah->ls_age = htons (ls_age); | |
2780 | ||
2781 | } | |
2782 | ||
2783 | /* Remove LSA from DB summary list. */ | |
2784 | ospf_lsdb_delete (lsdb, lsa); | |
2785 | } | |
2786 | } | |
2787 | ||
8dd24ee6 PJ |
2788 | /* Update 'More' bit */ |
2789 | if (ospf_db_summary_isempty (nbr)) | |
2790 | { | |
b5aeb441 PJ |
2791 | empty: |
2792 | if (nbr->state >= NSM_Exchange) | |
2793 | { | |
2794 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_M); | |
2795 | /* Rewrite DD flags */ | |
2796 | stream_putc_at (s, pp, nbr->dd_flags); | |
2797 | } | |
2798 | else | |
2799 | { | |
2800 | assert (IS_SET_DD_M(nbr->dd_flags)); | |
2801 | } | |
8dd24ee6 | 2802 | } |
718e3744 | 2803 | return length; |
2804 | } | |
2805 | ||
4dadc291 | 2806 | static int |
718e3744 | 2807 | ospf_make_ls_req_func (struct stream *s, u_int16_t *length, |
2808 | unsigned long delta, struct ospf_neighbor *nbr, | |
2809 | struct ospf_lsa *lsa) | |
2810 | { | |
2811 | struct ospf_interface *oi; | |
2812 | ||
2813 | oi = nbr->oi; | |
2814 | ||
2815 | /* LS Request packet overflows interface MTU. */ | |
86f1fd96 | 2816 | if (*length + delta > ospf_packet_max(oi)) |
718e3744 | 2817 | return 0; |
2818 | ||
2819 | stream_putl (s, lsa->data->type); | |
2820 | stream_put_ipv4 (s, lsa->data->id.s_addr); | |
2821 | stream_put_ipv4 (s, lsa->data->adv_router.s_addr); | |
2822 | ||
1fe6ed38 | 2823 | ospf_lsa_unlock (&nbr->ls_req_last); |
718e3744 | 2824 | nbr->ls_req_last = ospf_lsa_lock (lsa); |
2825 | ||
2826 | *length += 12; | |
2827 | return 1; | |
2828 | } | |
2829 | ||
4dadc291 | 2830 | static int |
718e3744 | 2831 | ospf_make_ls_req (struct ospf_neighbor *nbr, struct stream *s) |
2832 | { | |
2833 | struct ospf_lsa *lsa; | |
2834 | u_int16_t length = OSPF_LS_REQ_MIN_SIZE; | |
9985f83c | 2835 | unsigned long delta = stream_get_endp(s)+12; |
718e3744 | 2836 | struct route_table *table; |
2837 | struct route_node *rn; | |
2838 | int i; | |
2839 | struct ospf_lsdb *lsdb; | |
2840 | ||
2841 | lsdb = &nbr->ls_req; | |
2842 | ||
2843 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
2844 | { | |
2845 | table = lsdb->type[i].db; | |
2846 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
2847 | if ((lsa = (rn->info)) != NULL) | |
2848 | if (ospf_make_ls_req_func (s, &length, delta, nbr, lsa) == 0) | |
2849 | { | |
2850 | route_unlock_node (rn); | |
2851 | break; | |
2852 | } | |
2853 | } | |
2854 | return length; | |
2855 | } | |
2856 | ||
4dadc291 | 2857 | static int |
718e3744 | 2858 | ls_age_increment (struct ospf_lsa *lsa, int delay) |
2859 | { | |
2860 | int age; | |
2861 | ||
2862 | age = IS_LSA_MAXAGE (lsa) ? OSPF_LSA_MAXAGE : LS_AGE (lsa) + delay; | |
2863 | ||
2864 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); | |
2865 | } | |
2866 | ||
4dadc291 | 2867 | static int |
52dc7ee6 | 2868 | ospf_make_ls_upd (struct ospf_interface *oi, struct list *update, struct stream *s) |
718e3744 | 2869 | { |
2870 | struct ospf_lsa *lsa; | |
52dc7ee6 | 2871 | struct listnode *node; |
c9035ccd | 2872 | u_int16_t length = 0; |
86f1fd96 | 2873 | unsigned int size_noauth; |
9985f83c | 2874 | unsigned long delta = stream_get_endp (s); |
718e3744 | 2875 | unsigned long pp; |
2876 | int count = 0; | |
2877 | ||
2878 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2879 | zlog_debug ("ospf_make_ls_upd: Start"); |
59ea14c6 | 2880 | |
9985f83c | 2881 | pp = stream_get_endp (s); |
2882 | stream_forward_endp (s, OSPF_LS_UPD_MIN_SIZE); | |
c9035ccd | 2883 | length += OSPF_LS_UPD_MIN_SIZE; |
718e3744 | 2884 | |
86f1fd96 | 2885 | /* Calculate amount of packet usable for data. */ |
2886 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
2887 | ||
718e3744 | 2888 | while ((node = listhead (update)) != NULL) |
2889 | { | |
2890 | struct lsa_header *lsah; | |
2891 | u_int16_t ls_age; | |
2892 | ||
2893 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2894 | zlog_debug ("ospf_make_ls_upd: List Iteration"); |
718e3744 | 2895 | |
1eb8ef25 | 2896 | lsa = listgetdata (node); |
2897 | ||
718e3744 | 2898 | assert (lsa->data); |
2899 | ||
68b7339a | 2900 | /* Will it fit? */ |
86f1fd96 | 2901 | if (length + delta + ntohs (lsa->data->length) > size_noauth) |
59ea14c6 | 2902 | break; |
2903 | ||
718e3744 | 2904 | /* Keep pointer to LS age. */ |
9985f83c | 2905 | lsah = (struct lsa_header *) (STREAM_DATA (s) + stream_get_endp (s)); |
718e3744 | 2906 | |
2907 | /* Put LSA to Link State Request. */ | |
2908 | stream_put (s, lsa->data, ntohs (lsa->data->length)); | |
2909 | ||
2910 | /* Set LS age. */ | |
2911 | /* each hop must increment an lsa_age by transmit_delay | |
2912 | of OSPF interface */ | |
2913 | ls_age = ls_age_increment (lsa, OSPF_IF_PARAM (oi, transmit_delay)); | |
2914 | lsah->ls_age = htons (ls_age); | |
2915 | ||
2916 | length += ntohs (lsa->data->length); | |
2917 | count++; | |
2918 | ||
2919 | list_delete_node (update, node); | |
1fe6ed38 | 2920 | ospf_lsa_unlock (&lsa); /* oi->ls_upd_queue */ |
718e3744 | 2921 | } |
2922 | ||
2923 | /* Now set #LSAs. */ | |
3a9eb091 | 2924 | stream_putl_at (s, pp, count); |
718e3744 | 2925 | |
2926 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2927 | zlog_debug ("ospf_make_ls_upd: Stop"); |
718e3744 | 2928 | return length; |
2929 | } | |
2930 | ||
4dadc291 | 2931 | static int |
52dc7ee6 | 2932 | ospf_make_ls_ack (struct ospf_interface *oi, struct list *ack, struct stream *s) |
718e3744 | 2933 | { |
1fe6ed38 | 2934 | struct listnode *node, *nnode; |
718e3744 | 2935 | u_int16_t length = OSPF_LS_ACK_MIN_SIZE; |
9985f83c | 2936 | unsigned long delta = stream_get_endp(s) + 24; |
718e3744 | 2937 | struct ospf_lsa *lsa; |
2938 | ||
1fe6ed38 | 2939 | for (ALL_LIST_ELEMENTS (ack, node, nnode, lsa)) |
718e3744 | 2940 | { |
718e3744 | 2941 | assert (lsa); |
2942 | ||
86f1fd96 | 2943 | if (length + delta > ospf_packet_max (oi)) |
718e3744 | 2944 | break; |
2945 | ||
2946 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
2947 | length += OSPF_LSA_HEADER_SIZE; | |
2948 | ||
718e3744 | 2949 | listnode_delete (ack, lsa); |
1fe6ed38 | 2950 | ospf_lsa_unlock (&lsa); /* oi->ls_ack_direct.ls_ack */ |
718e3744 | 2951 | } |
2952 | ||
718e3744 | 2953 | return length; |
2954 | } | |
2955 | ||
2956 | void | |
2957 | ospf_hello_send_sub (struct ospf_interface *oi, struct in_addr *addr) | |
2958 | { | |
2959 | struct ospf_packet *op; | |
2960 | u_int16_t length = OSPF_HEADER_SIZE; | |
2961 | ||
2962 | op = ospf_packet_new (oi->ifp->mtu); | |
2963 | ||
2964 | /* Prepare OSPF common header. */ | |
2965 | ospf_make_header (OSPF_MSG_HELLO, oi, op->s); | |
2966 | ||
2967 | /* Prepare OSPF Hello body. */ | |
2968 | length += ospf_make_hello (oi, op->s); | |
2969 | ||
2970 | /* Fill OSPF header. */ | |
2971 | ospf_fill_header (oi, op->s, length); | |
2972 | ||
2973 | /* Set packet length. */ | |
2974 | op->length = length; | |
2975 | ||
2976 | op->dst.s_addr = addr->s_addr; | |
2977 | ||
2978 | /* Add packet to the interface output queue. */ | |
2979 | ospf_packet_add (oi, op); | |
2980 | ||
2981 | /* Hook thread to write packet. */ | |
020709f9 | 2982 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 2983 | } |
2984 | ||
4dadc291 | 2985 | static void |
718e3744 | 2986 | ospf_poll_send (struct ospf_nbr_nbma *nbr_nbma) |
2987 | { | |
2988 | struct ospf_interface *oi; | |
2989 | ||
2990 | oi = nbr_nbma->oi; | |
2991 | assert(oi); | |
2992 | ||
2993 | /* If this is passive interface, do not send OSPF Hello. */ | |
7ffa8fa2 | 2994 | if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) |
718e3744 | 2995 | return; |
2996 | ||
2997 | if (oi->type != OSPF_IFTYPE_NBMA) | |
2998 | return; | |
2999 | ||
3000 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) | |
3001 | return; | |
3002 | ||
3003 | if (PRIORITY(oi) == 0) | |
3004 | return; | |
3005 | ||
3006 | if (nbr_nbma->priority == 0 | |
3007 | && oi->state != ISM_DR && oi->state != ISM_Backup) | |
3008 | return; | |
3009 | ||
3010 | ospf_hello_send_sub (oi, &nbr_nbma->addr); | |
3011 | } | |
3012 | ||
3013 | int | |
3014 | ospf_poll_timer (struct thread *thread) | |
3015 | { | |
3016 | struct ospf_nbr_nbma *nbr_nbma; | |
3017 | ||
3018 | nbr_nbma = THREAD_ARG (thread); | |
3019 | nbr_nbma->t_poll = NULL; | |
3020 | ||
3021 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3022 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Poll timer expire)", |
718e3744 | 3023 | IF_NAME (nbr_nbma->oi), inet_ntoa (nbr_nbma->addr)); |
3024 | ||
3025 | ospf_poll_send (nbr_nbma); | |
3026 | ||
3027 | if (nbr_nbma->v_poll > 0) | |
3028 | OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, | |
3029 | nbr_nbma->v_poll); | |
3030 | ||
3031 | return 0; | |
3032 | } | |
3033 | ||
3034 | ||
3035 | int | |
3036 | ospf_hello_reply_timer (struct thread *thread) | |
3037 | { | |
3038 | struct ospf_neighbor *nbr; | |
3039 | ||
3040 | nbr = THREAD_ARG (thread); | |
3041 | nbr->t_hello_reply = NULL; | |
3042 | ||
3043 | assert (nbr->oi); | |
3044 | ||
3045 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3046 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (hello-reply timer expire)", |
718e3744 | 3047 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); |
3048 | ||
3049 | ospf_hello_send_sub (nbr->oi, &nbr->address.u.prefix4); | |
3050 | ||
3051 | return 0; | |
3052 | } | |
3053 | ||
3054 | /* Send OSPF Hello. */ | |
3055 | void | |
3056 | ospf_hello_send (struct ospf_interface *oi) | |
3057 | { | |
3058 | struct ospf_packet *op; | |
3059 | u_int16_t length = OSPF_HEADER_SIZE; | |
3060 | ||
3061 | /* If this is passive interface, do not send OSPF Hello. */ | |
7ffa8fa2 | 3062 | if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE) |
718e3744 | 3063 | return; |
3064 | ||
3065 | op = ospf_packet_new (oi->ifp->mtu); | |
3066 | ||
3067 | /* Prepare OSPF common header. */ | |
3068 | ospf_make_header (OSPF_MSG_HELLO, oi, op->s); | |
3069 | ||
3070 | /* Prepare OSPF Hello body. */ | |
3071 | length += ospf_make_hello (oi, op->s); | |
3072 | ||
3073 | /* Fill OSPF header. */ | |
3074 | ospf_fill_header (oi, op->s, length); | |
3075 | ||
3076 | /* Set packet length. */ | |
3077 | op->length = length; | |
3078 | ||
3079 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3080 | { | |
3081 | struct ospf_neighbor *nbr; | |
3082 | struct route_node *rn; | |
3083 | ||
3084 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3085 | if ((nbr = rn->info)) | |
3086 | if (nbr != oi->nbr_self) | |
3087 | if (nbr->state != NSM_Down) | |
3088 | { | |
3089 | /* RFC 2328 Section 9.5.1 | |
3090 | If the router is not eligible to become Designated Router, | |
3091 | it must periodically send Hello Packets to both the | |
3092 | Designated Router and the Backup Designated Router (if they | |
3093 | exist). */ | |
3094 | if (PRIORITY(oi) == 0 && | |
3095 | IPV4_ADDR_CMP(&DR(oi), &nbr->address.u.prefix4) && | |
3096 | IPV4_ADDR_CMP(&BDR(oi), &nbr->address.u.prefix4)) | |
3097 | continue; | |
3098 | ||
3099 | /* If the router is eligible to become Designated Router, it | |
3100 | must periodically send Hello Packets to all neighbors that | |
3101 | are also eligible. In addition, if the router is itself the | |
3102 | Designated Router or Backup Designated Router, it must also | |
3103 | send periodic Hello Packets to all other neighbors. */ | |
3104 | ||
3105 | if (nbr->priority == 0 && oi->state == ISM_DROther) | |
3106 | continue; | |
3107 | /* if oi->state == Waiting, send hello to all neighbors */ | |
3108 | { | |
3109 | struct ospf_packet *op_dup; | |
3110 | ||
3111 | op_dup = ospf_packet_dup(op); | |
3112 | op_dup->dst = nbr->address.u.prefix4; | |
3113 | ||
3114 | /* Add packet to the interface output queue. */ | |
3115 | ospf_packet_add (oi, op_dup); | |
3116 | ||
020709f9 | 3117 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3118 | } |
3119 | ||
3120 | } | |
3121 | ospf_packet_free (op); | |
3122 | } | |
3123 | else | |
3124 | { | |
3125 | /* Decide destination address. */ | |
3126 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3127 | op->dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
3128 | else | |
3129 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3130 | ||
3131 | /* Add packet to the interface output queue. */ | |
3132 | ospf_packet_add (oi, op); | |
3133 | ||
3134 | /* Hook thread to write packet. */ | |
020709f9 | 3135 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3136 | } |
3137 | } | |
3138 | ||
3139 | /* Send OSPF Database Description. */ | |
3140 | void | |
3141 | ospf_db_desc_send (struct ospf_neighbor *nbr) | |
3142 | { | |
3143 | struct ospf_interface *oi; | |
3144 | struct ospf_packet *op; | |
3145 | u_int16_t length = OSPF_HEADER_SIZE; | |
3146 | ||
3147 | oi = nbr->oi; | |
3148 | op = ospf_packet_new (oi->ifp->mtu); | |
3149 | ||
3150 | /* Prepare OSPF common header. */ | |
3151 | ospf_make_header (OSPF_MSG_DB_DESC, oi, op->s); | |
3152 | ||
3153 | /* Prepare OSPF Database Description body. */ | |
3154 | length += ospf_make_db_desc (oi, nbr, op->s); | |
3155 | ||
3156 | /* Fill OSPF header. */ | |
3157 | ospf_fill_header (oi, op->s, length); | |
3158 | ||
3159 | /* Set packet length. */ | |
3160 | op->length = length; | |
3161 | ||
3162 | /* Decide destination address. */ | |
53d0dece JT |
3163 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3164 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3165 | else | |
3166 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3167 | |
3168 | /* Add packet to the interface output queue. */ | |
3169 | ospf_packet_add (oi, op); | |
3170 | ||
3171 | /* Hook thread to write packet. */ | |
020709f9 | 3172 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3173 | |
3174 | /* Remove old DD packet, then copy new one and keep in neighbor structure. */ | |
3175 | if (nbr->last_send) | |
3176 | ospf_packet_free (nbr->last_send); | |
3177 | nbr->last_send = ospf_packet_dup (op); | |
2518efd1 | 3178 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &nbr->last_send_ts); |
718e3744 | 3179 | } |
3180 | ||
3181 | /* Re-send Database Description. */ | |
3182 | void | |
3183 | ospf_db_desc_resend (struct ospf_neighbor *nbr) | |
3184 | { | |
3185 | struct ospf_interface *oi; | |
3186 | ||
3187 | oi = nbr->oi; | |
3188 | ||
3189 | /* Add packet to the interface output queue. */ | |
3190 | ospf_packet_add (oi, ospf_packet_dup (nbr->last_send)); | |
3191 | ||
3192 | /* Hook thread to write packet. */ | |
020709f9 | 3193 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3194 | } |
3195 | ||
3196 | /* Send Link State Request. */ | |
3197 | void | |
3198 | ospf_ls_req_send (struct ospf_neighbor *nbr) | |
3199 | { | |
3200 | struct ospf_interface *oi; | |
3201 | struct ospf_packet *op; | |
3202 | u_int16_t length = OSPF_HEADER_SIZE; | |
3203 | ||
3204 | oi = nbr->oi; | |
3205 | op = ospf_packet_new (oi->ifp->mtu); | |
3206 | ||
3207 | /* Prepare OSPF common header. */ | |
3208 | ospf_make_header (OSPF_MSG_LS_REQ, oi, op->s); | |
3209 | ||
3210 | /* Prepare OSPF Link State Request body. */ | |
3211 | length += ospf_make_ls_req (nbr, op->s); | |
3212 | if (length == OSPF_HEADER_SIZE) | |
3213 | { | |
3214 | ospf_packet_free (op); | |
3215 | return; | |
3216 | } | |
3217 | ||
3218 | /* Fill OSPF header. */ | |
3219 | ospf_fill_header (oi, op->s, length); | |
3220 | ||
3221 | /* Set packet length. */ | |
3222 | op->length = length; | |
3223 | ||
3224 | /* Decide destination address. */ | |
53d0dece JT |
3225 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3226 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3227 | else | |
3228 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3229 | |
3230 | /* Add packet to the interface output queue. */ | |
3231 | ospf_packet_add (oi, op); | |
3232 | ||
3233 | /* Hook thread to write packet. */ | |
020709f9 | 3234 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3235 | |
3236 | /* Add Link State Request Retransmission Timer. */ | |
3237 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
3238 | } | |
3239 | ||
3240 | /* Send Link State Update with an LSA. */ | |
3241 | void | |
3242 | ospf_ls_upd_send_lsa (struct ospf_neighbor *nbr, struct ospf_lsa *lsa, | |
3243 | int flag) | |
3244 | { | |
52dc7ee6 | 3245 | struct list *update; |
718e3744 | 3246 | |
3247 | update = list_new (); | |
3248 | ||
3249 | listnode_add (update, lsa); | |
3250 | ospf_ls_upd_send (nbr, update, flag); | |
3251 | ||
3252 | list_delete (update); | |
3253 | } | |
3254 | ||
68b7339a | 3255 | /* Determine size for packet. Must be at least big enough to accomodate next |
3256 | * LSA on list, which may be bigger than MTU size. | |
3257 | * | |
3258 | * Return pointer to new ospf_packet | |
3259 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3260 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3261 | */ | |
3262 | static struct ospf_packet * | |
3263 | ospf_ls_upd_packet_new (struct list *update, struct ospf_interface *oi) | |
3264 | { | |
3265 | struct ospf_lsa *lsa; | |
3266 | struct listnode *ln; | |
3267 | size_t size; | |
3268 | static char warned = 0; | |
3269 | ||
1eb8ef25 | 3270 | lsa = listgetdata((ln = listhead (update))); |
68b7339a | 3271 | assert (lsa->data); |
3272 | ||
3273 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs (lsa->data->length)) | |
3274 | > ospf_packet_max (oi)) | |
3275 | { | |
3276 | if (!warned) | |
3277 | { | |
3278 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA encountered!" | |
3279 | "will need to fragment. Not optimal. Try divide up" | |
3280 | " your network with areas. Use 'debug ospf packet send'" | |
3281 | " to see details, or look at 'show ip ospf database ..'"); | |
3282 | warned = 1; | |
3283 | } | |
3284 | ||
3285 | if (IS_DEBUG_OSPF_PACKET (0, SEND)) | |
2a42e285 | 3286 | zlog_debug ("ospf_ls_upd_packet_new: oversized LSA id:%s," |
68b7339a | 3287 | " %d bytes originated by %s, will be fragmented!", |
3288 | inet_ntoa (lsa->data->id), | |
3289 | ntohs (lsa->data->length), | |
3290 | inet_ntoa (lsa->data->adv_router)); | |
3291 | ||
3292 | /* | |
3293 | * Allocate just enough to fit this LSA only, to avoid including other | |
3294 | * LSAs in fragmented LSA Updates. | |
3295 | */ | |
3296 | size = ntohs (lsa->data->length) + (oi->ifp->mtu - ospf_packet_max (oi)) | |
3297 | + OSPF_LS_UPD_MIN_SIZE; | |
3298 | } | |
3299 | else | |
3300 | size = oi->ifp->mtu; | |
3301 | ||
3302 | if (size > OSPF_MAX_PACKET_SIZE) | |
3303 | { | |
3304 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA id:%s too big," | |
64511f39 | 3305 | " %d bytes, packet size %ld, dropping it completely." |
68b7339a | 3306 | " OSPF routing is broken!", |
37ccfa3d | 3307 | inet_ntoa (lsa->data->id), ntohs (lsa->data->length), |
62d8e96a | 3308 | (long int) size); |
68b7339a | 3309 | list_delete_node (update, ln); |
3310 | return NULL; | |
3311 | } | |
3312 | ||
c9035ccd DT |
3313 | /* IP header is built up separately by ospf_write(). This means, that we must |
3314 | * reduce the "affordable" size just calculated by length of an IP header. | |
3315 | * This makes sure, that even if we manage to fill the payload with LSA data | |
3316 | * completely, the final packet (our data plus IP header) still fits into | |
3317 | * outgoing interface MTU. This correction isn't really meaningful for an | |
3318 | * oversized LSA, but for consistency the correction is done for both cases. | |
3319 | * | |
3320 | * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size | |
3321 | */ | |
3322 | return ospf_packet_new (size - sizeof (struct ip)); | |
68b7339a | 3323 | } |
3324 | ||
718e3744 | 3325 | static void |
52dc7ee6 | 3326 | ospf_ls_upd_queue_send (struct ospf_interface *oi, struct list *update, |
718e3744 | 3327 | struct in_addr addr) |
3328 | { | |
3329 | struct ospf_packet *op; | |
3330 | u_int16_t length = OSPF_HEADER_SIZE; | |
3331 | ||
3332 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3333 | zlog_debug ("listcount = %d, dst %s", listcount (update), inet_ntoa(addr)); |
68b7339a | 3334 | |
3335 | op = ospf_ls_upd_packet_new (update, oi); | |
718e3744 | 3336 | |
3337 | /* Prepare OSPF common header. */ | |
3338 | ospf_make_header (OSPF_MSG_LS_UPD, oi, op->s); | |
3339 | ||
59ea14c6 | 3340 | /* Prepare OSPF Link State Update body. |
3341 | * Includes Type-7 translation. | |
3342 | */ | |
718e3744 | 3343 | length += ospf_make_ls_upd (oi, update, op->s); |
3344 | ||
3345 | /* Fill OSPF header. */ | |
3346 | ospf_fill_header (oi, op->s, length); | |
3347 | ||
3348 | /* Set packet length. */ | |
3349 | op->length = length; | |
3350 | ||
3351 | /* Decide destination address. */ | |
53d0dece JT |
3352 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3353 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3354 | else | |
3355 | op->dst.s_addr = addr.s_addr; | |
718e3744 | 3356 | |
3357 | /* Add packet to the interface output queue. */ | |
3358 | ospf_packet_add (oi, op); | |
3359 | ||
3360 | /* Hook thread to write packet. */ | |
020709f9 | 3361 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3362 | } |
3363 | ||
3364 | static int | |
3365 | ospf_ls_upd_send_queue_event (struct thread *thread) | |
3366 | { | |
3367 | struct ospf_interface *oi = THREAD_ARG(thread); | |
3368 | struct route_node *rn; | |
736d3441 | 3369 | struct route_node *rnext; |
59ea14c6 | 3370 | struct list *update; |
68b7339a | 3371 | char again = 0; |
718e3744 | 3372 | |
3373 | oi->t_ls_upd_event = NULL; | |
3374 | ||
3375 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3376 | zlog_debug ("ospf_ls_upd_send_queue start"); |
718e3744 | 3377 | |
736d3441 | 3378 | for (rn = route_top (oi->ls_upd_queue); rn; rn = rnext) |
718e3744 | 3379 | { |
736d3441 | 3380 | rnext = route_next (rn); |
3381 | ||
718e3744 | 3382 | if (rn->info == NULL) |
736d3441 | 3383 | continue; |
68b7339a | 3384 | |
3385 | update = (struct list *)rn->info; | |
718e3744 | 3386 | |
48fe13bf | 3387 | ospf_ls_upd_queue_send (oi, update, rn->p.u.prefix4); |
718e3744 | 3388 | |
68b7339a | 3389 | /* list might not be empty. */ |
59ea14c6 | 3390 | if (listcount(update) == 0) |
3391 | { | |
3392 | list_delete (rn->info); | |
3393 | rn->info = NULL; | |
3394 | route_unlock_node (rn); | |
3395 | } | |
3396 | else | |
68b7339a | 3397 | again = 1; |
59ea14c6 | 3398 | } |
3399 | ||
3400 | if (again != 0) | |
3401 | { | |
3402 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3403 | zlog_debug ("ospf_ls_upd_send_queue: update lists not cleared," |
59ea14c6 | 3404 | " %d nodes to try again, raising new event", again); |
3405 | oi->t_ls_upd_event = | |
3406 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
718e3744 | 3407 | } |
3408 | ||
3409 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3410 | zlog_debug ("ospf_ls_upd_send_queue stop"); |
59ea14c6 | 3411 | |
718e3744 | 3412 | return 0; |
3413 | } | |
3414 | ||
3415 | void | |
52dc7ee6 | 3416 | ospf_ls_upd_send (struct ospf_neighbor *nbr, struct list *update, int flag) |
718e3744 | 3417 | { |
3418 | struct ospf_interface *oi; | |
1eb8ef25 | 3419 | struct ospf_lsa *lsa; |
718e3744 | 3420 | struct prefix_ipv4 p; |
3421 | struct route_node *rn; | |
1eb8ef25 | 3422 | struct listnode *node; |
718e3744 | 3423 | |
3424 | oi = nbr->oi; | |
3425 | ||
3426 | p.family = AF_INET; | |
3427 | p.prefixlen = IPV4_MAX_BITLEN; | |
3428 | ||
3429 | /* Decide destination address. */ | |
3430 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3431 | p.prefix = oi->vl_data->peer_addr; | |
53d0dece JT |
3432 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
3433 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3434 | else if (flag == OSPF_SEND_PACKET_DIRECT) |
3435 | p.prefix = nbr->address.u.prefix4; | |
3436 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3437 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
7afa08da | 3438 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3439 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3440 | else |
3441 | p.prefix.s_addr = htonl (OSPF_ALLDROUTERS); | |
3442 | ||
3443 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3444 | { | |
3445 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
3446 | zlog_warn ("* LS-Update is directly sent on NBMA network."); | |
3447 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix.s_addr)) | |
3448 | zlog_warn ("* LS-Update is sent to myself."); | |
3449 | } | |
3450 | ||
3451 | rn = route_node_get (oi->ls_upd_queue, (struct prefix *) &p); | |
3452 | ||
3453 | if (rn->info == NULL) | |
3454 | rn->info = list_new (); | |
3455 | ||
1eb8ef25 | 3456 | for (ALL_LIST_ELEMENTS_RO (update, node, lsa)) |
1fe6ed38 | 3457 | listnode_add (rn->info, ospf_lsa_lock (lsa)); /* oi->ls_upd_queue */ |
718e3744 | 3458 | |
3459 | if (oi->t_ls_upd_event == NULL) | |
3460 | oi->t_ls_upd_event = | |
3461 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
3462 | } | |
3463 | ||
3464 | static void | |
52dc7ee6 | 3465 | ospf_ls_ack_send_list (struct ospf_interface *oi, struct list *ack, |
3466 | struct in_addr dst) | |
718e3744 | 3467 | { |
3468 | struct ospf_packet *op; | |
3469 | u_int16_t length = OSPF_HEADER_SIZE; | |
3470 | ||
3471 | op = ospf_packet_new (oi->ifp->mtu); | |
3472 | ||
3473 | /* Prepare OSPF common header. */ | |
3474 | ospf_make_header (OSPF_MSG_LS_ACK, oi, op->s); | |
3475 | ||
3476 | /* Prepare OSPF Link State Acknowledgment body. */ | |
3477 | length += ospf_make_ls_ack (oi, ack, op->s); | |
3478 | ||
3479 | /* Fill OSPF header. */ | |
3480 | ospf_fill_header (oi, op->s, length); | |
3481 | ||
3482 | /* Set packet length. */ | |
3483 | op->length = length; | |
3484 | ||
3485 | /* Set destination IP address. */ | |
3486 | op->dst = dst; | |
3487 | ||
3488 | /* Add packet to the interface output queue. */ | |
3489 | ospf_packet_add (oi, op); | |
3490 | ||
3491 | /* Hook thread to write packet. */ | |
020709f9 | 3492 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3493 | } |
3494 | ||
3495 | static int | |
3496 | ospf_ls_ack_send_event (struct thread *thread) | |
3497 | { | |
3498 | struct ospf_interface *oi = THREAD_ARG (thread); | |
3499 | ||
3500 | oi->t_ls_ack_direct = NULL; | |
3501 | ||
3502 | while (listcount (oi->ls_ack_direct.ls_ack)) | |
3503 | ospf_ls_ack_send_list (oi, oi->ls_ack_direct.ls_ack, | |
3504 | oi->ls_ack_direct.dst); | |
3505 | ||
3506 | return 0; | |
3507 | } | |
3508 | ||
3509 | void | |
3510 | ospf_ls_ack_send (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
3511 | { | |
3512 | struct ospf_interface *oi = nbr->oi; | |
3513 | ||
3514 | if (listcount (oi->ls_ack_direct.ls_ack) == 0) | |
3515 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
3516 | ||
3517 | listnode_add (oi->ls_ack_direct.ls_ack, ospf_lsa_lock (lsa)); | |
3518 | ||
3519 | if (oi->t_ls_ack_direct == NULL) | |
3520 | oi->t_ls_ack_direct = | |
3521 | thread_add_event (master, ospf_ls_ack_send_event, oi, 0); | |
3522 | } | |
3523 | ||
3524 | /* Send Link State Acknowledgment delayed. */ | |
3525 | void | |
3526 | ospf_ls_ack_send_delayed (struct ospf_interface *oi) | |
3527 | { | |
3528 | struct in_addr dst; | |
3529 | ||
3530 | /* Decide destination address. */ | |
3531 | /* RFC2328 Section 13.5 On non-broadcast | |
3532 | networks, delayed Link State Acknowledgment packets must be | |
3533 | unicast separately over each adjacency (i.e., neighbor whose | |
3534 | state is >= Exchange). */ | |
3535 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3536 | { | |
3537 | struct ospf_neighbor *nbr; | |
3538 | struct route_node *rn; | |
3539 | ||
3540 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3541 | if ((nbr = rn->info) != NULL) | |
3542 | if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange) | |
3543 | while (listcount (oi->ls_ack)) | |
3544 | ospf_ls_ack_send_list (oi, oi->ls_ack, nbr->address.u.prefix4); | |
3545 | return; | |
3546 | } | |
3547 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3548 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
3549 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3550 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3551 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3552 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
630e4807 | 3553 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3554 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3555 | else |
3556 | dst.s_addr = htonl (OSPF_ALLDROUTERS); | |
3557 | ||
3558 | while (listcount (oi->ls_ack)) | |
3559 | ospf_ls_ack_send_list (oi, oi->ls_ack, dst); | |
3560 | } |