]>
Commit | Line | Data |
---|---|---|
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" |
718e3744 | 35 | #include "md5-gnu.h" |
36 | ||
37 | #include "ospfd/ospfd.h" | |
38 | #include "ospfd/ospf_network.h" | |
39 | #include "ospfd/ospf_interface.h" | |
40 | #include "ospfd/ospf_ism.h" | |
41 | #include "ospfd/ospf_asbr.h" | |
42 | #include "ospfd/ospf_lsa.h" | |
43 | #include "ospfd/ospf_lsdb.h" | |
44 | #include "ospfd/ospf_neighbor.h" | |
45 | #include "ospfd/ospf_nsm.h" | |
46 | #include "ospfd/ospf_packet.h" | |
47 | #include "ospfd/ospf_spf.h" | |
48 | #include "ospfd/ospf_flood.h" | |
49 | #include "ospfd/ospf_dump.h" | |
50 | ||
52dc7ee6 | 51 | static void ospf_ls_ack_send_list (struct ospf_interface *, struct list *, |
718e3744 | 52 | struct in_addr); |
53 | ||
54 | /* Packet Type String. */ | |
eb1ce605 | 55 | const char *ospf_packet_type_str[] = |
718e3744 | 56 | { |
57 | "unknown", | |
58 | "Hello", | |
59 | "Database Description", | |
60 | "Link State Request", | |
61 | "Link State Update", | |
62 | "Link State Acknowledgment", | |
63 | }; | |
64 | ||
65 | extern int in_cksum (void *ptr, int nbytes); | |
66 | ||
67 | /* OSPF authentication checking function */ | |
4dadc291 | 68 | static int |
718e3744 | 69 | ospf_auth_type (struct ospf_interface *oi) |
70 | { | |
71 | int auth_type; | |
72 | ||
73 | if (OSPF_IF_PARAM (oi, auth_type) == OSPF_AUTH_NOTSET) | |
74 | auth_type = oi->area->auth_type; | |
75 | else | |
76 | auth_type = OSPF_IF_PARAM (oi, auth_type); | |
77 | ||
78 | /* Handle case where MD5 key list is not configured aka Cisco */ | |
79 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC && | |
80 | list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
81 | return OSPF_AUTH_NULL; | |
82 | ||
83 | return auth_type; | |
84 | ||
85 | } | |
86 | ||
718e3744 | 87 | struct ospf_packet * |
88 | ospf_packet_new (size_t size) | |
89 | { | |
90 | struct ospf_packet *new; | |
91 | ||
92 | new = XCALLOC (MTYPE_OSPF_PACKET, sizeof (struct ospf_packet)); | |
93 | new->s = stream_new (size); | |
94 | ||
95 | return new; | |
96 | } | |
97 | ||
98 | void | |
99 | ospf_packet_free (struct ospf_packet *op) | |
100 | { | |
101 | if (op->s) | |
102 | stream_free (op->s); | |
103 | ||
104 | XFREE (MTYPE_OSPF_PACKET, op); | |
105 | ||
106 | op = NULL; | |
107 | } | |
108 | ||
109 | struct ospf_fifo * | |
110 | ospf_fifo_new () | |
111 | { | |
112 | struct ospf_fifo *new; | |
113 | ||
114 | new = XCALLOC (MTYPE_OSPF_FIFO, sizeof (struct ospf_fifo)); | |
115 | return new; | |
116 | } | |
117 | ||
118 | /* Add new packet to fifo. */ | |
119 | void | |
120 | ospf_fifo_push (struct ospf_fifo *fifo, struct ospf_packet *op) | |
121 | { | |
122 | if (fifo->tail) | |
123 | fifo->tail->next = op; | |
124 | else | |
125 | fifo->head = op; | |
126 | ||
127 | fifo->tail = op; | |
128 | ||
129 | fifo->count++; | |
130 | } | |
131 | ||
132 | /* Delete first packet from fifo. */ | |
133 | struct ospf_packet * | |
134 | ospf_fifo_pop (struct ospf_fifo *fifo) | |
135 | { | |
136 | struct ospf_packet *op; | |
137 | ||
138 | op = fifo->head; | |
139 | ||
140 | if (op) | |
141 | { | |
142 | fifo->head = op->next; | |
143 | ||
144 | if (fifo->head == NULL) | |
145 | fifo->tail = NULL; | |
146 | ||
147 | fifo->count--; | |
148 | } | |
149 | ||
150 | return op; | |
151 | } | |
152 | ||
153 | /* Return first fifo entry. */ | |
154 | struct ospf_packet * | |
155 | ospf_fifo_head (struct ospf_fifo *fifo) | |
156 | { | |
157 | return fifo->head; | |
158 | } | |
159 | ||
160 | /* Flush ospf packet fifo. */ | |
161 | void | |
162 | ospf_fifo_flush (struct ospf_fifo *fifo) | |
163 | { | |
164 | struct ospf_packet *op; | |
165 | struct ospf_packet *next; | |
166 | ||
167 | for (op = fifo->head; op; op = next) | |
168 | { | |
169 | next = op->next; | |
170 | ospf_packet_free (op); | |
171 | } | |
172 | fifo->head = fifo->tail = NULL; | |
173 | fifo->count = 0; | |
174 | } | |
175 | ||
176 | /* Free ospf packet fifo. */ | |
177 | void | |
178 | ospf_fifo_free (struct ospf_fifo *fifo) | |
179 | { | |
180 | ospf_fifo_flush (fifo); | |
181 | ||
182 | XFREE (MTYPE_OSPF_FIFO, fifo); | |
183 | } | |
184 | ||
185 | void | |
186 | ospf_packet_add (struct ospf_interface *oi, struct ospf_packet *op) | |
187 | { | |
c3eab871 | 188 | if (!oi->obuf) |
189 | { | |
190 | zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
191 | "destination %s) called with NULL obuf, ignoring " | |
192 | "(please report this bug)!\n", | |
193 | IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state), | |
194 | ospf_packet_type_str[stream_getc_from(op->s, 1)], | |
195 | inet_ntoa (op->dst)); | |
196 | return; | |
197 | } | |
198 | ||
718e3744 | 199 | /* Add packet to end of queue. */ |
200 | ospf_fifo_push (oi->obuf, op); | |
201 | ||
202 | /* Debug of packet fifo*/ | |
203 | /* ospf_fifo_debug (oi->obuf); */ | |
204 | } | |
205 | ||
206 | void | |
207 | ospf_packet_delete (struct ospf_interface *oi) | |
208 | { | |
209 | struct ospf_packet *op; | |
210 | ||
211 | op = ospf_fifo_pop (oi->obuf); | |
212 | ||
213 | if (op) | |
214 | ospf_packet_free (op); | |
215 | } | |
216 | ||
718e3744 | 217 | struct ospf_packet * |
218 | ospf_packet_dup (struct ospf_packet *op) | |
219 | { | |
220 | struct ospf_packet *new; | |
221 | ||
37163d6d | 222 | if (stream_get_endp(op->s) != op->length) |
223 | zlog_warn ("ospf_packet_dup stream %ld ospf_packet %d size mismatch", | |
30961a15 | 224 | STREAM_SIZE(op->s), op->length); |
30961a15 | 225 | |
226 | /* Reserve space for MD5 authentication that may be added later. */ | |
227 | new = ospf_packet_new (stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
fa81b713 | 228 | stream_copy (new->s, op->s); |
718e3744 | 229 | |
230 | new->dst = op->dst; | |
231 | new->length = op->length; | |
232 | ||
233 | return new; | |
234 | } | |
235 | ||
86f1fd96 | 236 | /* XXX inline */ |
4dadc291 | 237 | static inline unsigned int |
86f1fd96 | 238 | ospf_packet_authspace (struct ospf_interface *oi) |
239 | { | |
240 | int auth = 0; | |
241 | ||
242 | if ( ospf_auth_type (oi) == OSPF_AUTH_CRYPTOGRAPHIC) | |
243 | auth = OSPF_AUTH_MD5_SIZE; | |
244 | ||
245 | return auth; | |
246 | } | |
247 | ||
4dadc291 | 248 | static unsigned int |
718e3744 | 249 | ospf_packet_max (struct ospf_interface *oi) |
250 | { | |
251 | int max; | |
252 | ||
86f1fd96 | 253 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
254 | ||
68b7339a | 255 | max -= (OSPF_HEADER_SIZE + sizeof (struct ip)); |
718e3744 | 256 | |
257 | return max; | |
258 | } | |
259 | ||
260 | \f | |
4dadc291 | 261 | static int |
718e3744 | 262 | ospf_check_md5_digest (struct ospf_interface *oi, struct stream *s, |
263 | u_int16_t length) | |
264 | { | |
6c835671 | 265 | unsigned char *ibuf; |
718e3744 | 266 | struct md5_ctx ctx; |
267 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; | |
268 | unsigned char *pdigest; | |
269 | struct crypt_key *ck; | |
270 | struct ospf_header *ospfh; | |
271 | struct ospf_neighbor *nbr; | |
272 | ||
273 | ||
274 | ibuf = STREAM_PNT (s); | |
275 | ospfh = (struct ospf_header *) ibuf; | |
276 | ||
277 | /* Get pointer to the end of the packet. */ | |
278 | pdigest = ibuf + length; | |
279 | ||
280 | /* Get secret key. */ | |
281 | ck = ospf_crypt_key_lookup (OSPF_IF_PARAM (oi, auth_crypt), | |
282 | ospfh->u.crypt.key_id); | |
283 | if (ck == NULL) | |
284 | { | |
285 | zlog_warn ("interface %s: ospf_check_md5 no key %d", | |
286 | IF_NAME (oi), ospfh->u.crypt.key_id); | |
287 | return 0; | |
288 | } | |
289 | ||
290 | /* check crypto seqnum. */ | |
291 | nbr = ospf_nbr_lookup_by_routerid (oi->nbrs, &ospfh->router_id); | |
292 | ||
293 | if (nbr && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) | |
294 | { | |
295 | zlog_warn ("interface %s: ospf_check_md5 bad sequence %d (expect %d)", | |
296 | IF_NAME (oi), | |
297 | ntohl(ospfh->u.crypt.crypt_seqnum), | |
298 | ntohl(nbr->crypt_seqnum)); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | /* Generate a digest for the ospf packet - their digest + our digest. */ | |
303 | md5_init_ctx (&ctx); | |
304 | md5_process_bytes (ibuf, length, &ctx); | |
305 | md5_process_bytes (ck->auth_key, OSPF_AUTH_MD5_SIZE, &ctx); | |
306 | md5_finish_ctx (&ctx, digest); | |
307 | ||
308 | /* compare the two */ | |
309 | if (memcmp (pdigest, digest, OSPF_AUTH_MD5_SIZE)) | |
310 | { | |
311 | zlog_warn ("interface %s: ospf_check_md5 checksum mismatch", | |
312 | IF_NAME (oi)); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | /* save neighbor's crypt_seqnum */ | |
317 | if (nbr) | |
318 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
319 | return 1; | |
320 | } | |
321 | ||
322 | /* This function is called from ospf_write(), it will detect the | |
323 | authentication scheme and if it is MD5, it will change the sequence | |
324 | and update the MD5 digest. */ | |
4dadc291 | 325 | static int |
718e3744 | 326 | ospf_make_md5_digest (struct ospf_interface *oi, struct ospf_packet *op) |
327 | { | |
328 | struct ospf_header *ospfh; | |
329 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; | |
330 | struct md5_ctx ctx; | |
331 | void *ibuf; | |
9483e155 | 332 | u_int32_t t; |
718e3744 | 333 | struct crypt_key *ck; |
4dadc291 | 334 | const char *auth_key; |
718e3744 | 335 | |
336 | ibuf = STREAM_DATA (op->s); | |
337 | ospfh = (struct ospf_header *) ibuf; | |
338 | ||
339 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
340 | return 0; | |
341 | ||
342 | /* We do this here so when we dup a packet, we don't have to | |
343 | waste CPU rewriting other headers. */ | |
9483e155 | 344 | t = (time(NULL) & 0xFFFFFFFF); |
345 | oi->crypt_seqnum = ( t > oi->crypt_seqnum ? t : oi->crypt_seqnum++); | |
346 | ospfh->u.crypt.crypt_seqnum = htonl (oi->crypt_seqnum); | |
718e3744 | 347 | |
348 | /* Get MD5 Authentication key from auth_key list. */ | |
349 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
4dadc291 | 350 | auth_key = ""; |
718e3744 | 351 | else |
352 | { | |
1eb8ef25 | 353 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
4dadc291 | 354 | auth_key = ck->auth_key; |
718e3744 | 355 | } |
356 | ||
357 | /* Generate a digest for the entire packet + our secret key. */ | |
358 | md5_init_ctx (&ctx); | |
359 | md5_process_bytes (ibuf, ntohs (ospfh->length), &ctx); | |
360 | md5_process_bytes (auth_key, OSPF_AUTH_MD5_SIZE, &ctx); | |
361 | md5_finish_ctx (&ctx, digest); | |
362 | ||
363 | /* Append md5 digest to the end of the stream. */ | |
718e3744 | 364 | stream_put (op->s, digest, OSPF_AUTH_MD5_SIZE); |
718e3744 | 365 | |
366 | /* We do *NOT* increment the OSPF header length. */ | |
30961a15 | 367 | op->length = ntohs (ospfh->length) + OSPF_AUTH_MD5_SIZE; |
368 | ||
37163d6d | 369 | if (stream_get_endp(op->s) != op->length) |
370 | zlog_warn("ospf_make_md5_digest: length mismatch stream %ld ospf_packet %d", stream_get_endp(op->s), op->length); | |
718e3744 | 371 | |
372 | return OSPF_AUTH_MD5_SIZE; | |
373 | } | |
374 | ||
375 | \f | |
4dadc291 | 376 | static int |
718e3744 | 377 | ospf_ls_req_timer (struct thread *thread) |
378 | { | |
379 | struct ospf_neighbor *nbr; | |
380 | ||
381 | nbr = THREAD_ARG (thread); | |
382 | nbr->t_ls_req = NULL; | |
383 | ||
384 | /* Send Link State Request. */ | |
385 | if (ospf_ls_request_count (nbr)) | |
386 | ospf_ls_req_send (nbr); | |
387 | ||
388 | /* Set Link State Request retransmission timer. */ | |
389 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | void | |
395 | ospf_ls_req_event (struct ospf_neighbor *nbr) | |
396 | { | |
397 | if (nbr->t_ls_req) | |
398 | { | |
399 | thread_cancel (nbr->t_ls_req); | |
400 | nbr->t_ls_req = NULL; | |
401 | } | |
402 | nbr->t_ls_req = thread_add_event (master, ospf_ls_req_timer, nbr, 0); | |
403 | } | |
404 | ||
405 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
406 | ospf_neighbor.c */ | |
407 | int | |
408 | ospf_ls_upd_timer (struct thread *thread) | |
409 | { | |
410 | struct ospf_neighbor *nbr; | |
411 | ||
412 | nbr = THREAD_ARG (thread); | |
413 | nbr->t_ls_upd = NULL; | |
414 | ||
415 | /* Send Link State Update. */ | |
416 | if (ospf_ls_retransmit_count (nbr) > 0) | |
417 | { | |
52dc7ee6 | 418 | struct list *update; |
718e3744 | 419 | struct ospf_lsdb *lsdb; |
420 | int i; | |
421 | struct timeval now; | |
422 | int retransmit_interval; | |
423 | ||
424 | gettimeofday (&now, NULL); | |
425 | retransmit_interval = OSPF_IF_PARAM (nbr->oi, retransmit_interval); | |
426 | ||
427 | lsdb = &nbr->ls_rxmt; | |
428 | update = list_new (); | |
429 | ||
430 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
431 | { | |
432 | struct route_table *table = lsdb->type[i].db; | |
433 | struct route_node *rn; | |
434 | ||
435 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
436 | { | |
437 | struct ospf_lsa *lsa; | |
438 | ||
439 | if ((lsa = rn->info) != NULL) | |
440 | /* Don't retransmit an LSA if we received it within | |
441 | the last RxmtInterval seconds - this is to allow the | |
442 | neighbour a chance to acknowledge the LSA as it may | |
443 | have ben just received before the retransmit timer | |
444 | fired. This is a small tweak to what is in the RFC, | |
445 | but it will cut out out a lot of retransmit traffic | |
446 | - MAG */ | |
447 | if (tv_cmp (tv_sub (now, lsa->tv_recv), | |
448 | int2tv (retransmit_interval)) >= 0) | |
449 | listnode_add (update, rn->info); | |
450 | } | |
451 | } | |
452 | ||
453 | if (listcount (update) > 0) | |
454 | ospf_ls_upd_send (nbr, update, OSPF_SEND_PACKET_DIRECT); | |
455 | list_delete (update); | |
456 | } | |
457 | ||
458 | /* Set LS Update retransmission timer. */ | |
459 | OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | int | |
465 | ospf_ls_ack_timer (struct thread *thread) | |
466 | { | |
467 | struct ospf_interface *oi; | |
468 | ||
469 | oi = THREAD_ARG (thread); | |
470 | oi->t_ls_ack = NULL; | |
471 | ||
472 | /* Send Link State Acknowledgment. */ | |
473 | if (listcount (oi->ls_ack) > 0) | |
474 | ospf_ls_ack_send_delayed (oi); | |
475 | ||
476 | /* Set LS Ack timer. */ | |
477 | OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
0bfeca3f | 482 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
5dcbdf82 | 483 | static void |
6a99f831 | 484 | ospf_write_frags (int fd, struct ospf_packet *op, struct ip *iph, |
62d8e96a | 485 | struct msghdr *msg, unsigned int maxdatasize, |
37ccfa3d | 486 | unsigned int mtu, int flags, u_char type) |
0bfeca3f | 487 | { |
488 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
6a99f831 | 489 | u_int16_t offset; |
62d8e96a | 490 | struct iovec *iovp; |
6a99f831 | 491 | int ret; |
0bfeca3f | 492 | |
493 | assert ( op->length == stream_get_endp(op->s) ); | |
62d8e96a | 494 | assert (msg->msg_iovlen == 2); |
0bfeca3f | 495 | |
496 | /* we can but try. | |
497 | * | |
498 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
499 | * well as the IP_MF flag, making this all quite pointless. | |
500 | * | |
501 | * However, for a system on which IP_MF is left alone, and ip_id left | |
502 | * alone or else which sets same ip_id for each fragment this might | |
503 | * work, eg linux. | |
504 | * | |
505 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
506 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
507 | * be raised against the various kernels. | |
508 | */ | |
509 | ||
510 | /* set More Frag */ | |
511 | iph->ip_off |= IP_MF; | |
512 | ||
513 | /* ip frag offset is expressed in units of 8byte words */ | |
514 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
515 | ||
62d8e96a | 516 | iovp = &msg->msg_iov[1]; |
517 | ||
0bfeca3f | 518 | while ( (stream_get_endp(op->s) - stream_get_getp (op->s)) |
519 | > maxdatasize ) | |
520 | { | |
521 | /* data length of this frag is to next offset value */ | |
62d8e96a | 522 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; |
523 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
6a99f831 | 524 | assert (iph->ip_len <= mtu); |
0bfeca3f | 525 | |
18b12c38 | 526 | sockopt_iphdrincl_swab_htosys (iph); |
0bfeca3f | 527 | |
6a99f831 | 528 | ret = sendmsg (fd, msg, flags); |
0bfeca3f | 529 | |
18b12c38 | 530 | sockopt_iphdrincl_swab_systoh (iph); |
0bfeca3f | 531 | |
532 | if (ret < 0) | |
37ccfa3d | 533 | zlog_warn ("*** ospf_write_frags: sendmsg failed to %s," |
5dcbdf82 | 534 | " id %d, off %d, len %d, mtu %u failed with %s", |
535 | inet_ntoa (iph->ip_dst), | |
536 | iph->ip_id, | |
537 | iph->ip_off, | |
538 | iph->ip_len, | |
539 | mtu, | |
540 | safe_strerror (errno)); | |
0bfeca3f | 541 | |
37ccfa3d | 542 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) |
543 | { | |
2a42e285 | 544 | zlog_debug ("ospf_write_frags: sent id %d, off %d, len %d to %s\n", |
37ccfa3d | 545 | iph->ip_id, iph->ip_off, iph->ip_len, |
546 | inet_ntoa (iph->ip_dst)); | |
547 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
548 | { | |
2a42e285 | 549 | zlog_debug ("-----------------IP Header Dump----------------------"); |
37ccfa3d | 550 | ospf_ip_header_dump (iph); |
2a42e285 | 551 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 552 | } |
553 | } | |
554 | ||
0bfeca3f | 555 | iph->ip_off += offset; |
9985f83c | 556 | stream_forward_getp (op->s, iovp->iov_len); |
62d8e96a | 557 | iovp->iov_base = STREAM_PNT (op->s); |
0bfeca3f | 558 | } |
559 | ||
560 | /* setup for final fragment */ | |
62d8e96a | 561 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp (op->s); |
562 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
0bfeca3f | 563 | iph->ip_off &= (~IP_MF); |
564 | } | |
565 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
566 | ||
5dcbdf82 | 567 | static int |
718e3744 | 568 | ospf_write (struct thread *thread) |
569 | { | |
68980084 | 570 | struct ospf *ospf = THREAD_ARG (thread); |
718e3744 | 571 | struct ospf_interface *oi; |
572 | struct ospf_packet *op; | |
573 | struct sockaddr_in sa_dst; | |
718e3744 | 574 | struct ip iph; |
575 | struct msghdr msg; | |
62d8e96a | 576 | struct iovec iov[2]; |
68980084 | 577 | u_char type; |
578 | int ret; | |
579 | int flags = 0; | |
52dc7ee6 | 580 | struct listnode *node; |
0bfeca3f | 581 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 582 | static u_int16_t ipid = 0; |
0bfeca3f | 583 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
6a99f831 | 584 | u_int16_t maxdatasize; |
68b7339a | 585 | #define OSPF_WRITE_IPHL_SHIFT 2 |
718e3744 | 586 | |
68980084 | 587 | ospf->t_write = NULL; |
718e3744 | 588 | |
68980084 | 589 | node = listhead (ospf->oi_write_q); |
718e3744 | 590 | assert (node); |
1eb8ef25 | 591 | oi = listgetdata (node); |
718e3744 | 592 | assert (oi); |
0bfeca3f | 593 | |
594 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
68b7339a | 595 | /* seed ipid static with low order bits of time */ |
596 | if (ipid == 0) | |
597 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 598 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
599 | ||
68b7339a | 600 | /* convenience - max OSPF data per packet */ |
601 | maxdatasize = oi->ifp->mtu - sizeof (struct ip); | |
602 | ||
718e3744 | 603 | /* Get one packet from queue. */ |
604 | op = ospf_fifo_head (oi->obuf); | |
605 | assert (op); | |
606 | assert (op->length >= OSPF_HEADER_SIZE); | |
607 | ||
68980084 | 608 | if (op->dst.s_addr == htonl (OSPF_ALLSPFROUTERS) |
609 | || op->dst.s_addr == htonl (OSPF_ALLDROUTERS)) | |
68b7339a | 610 | ospf_if_ipmulticast (ospf, oi->address, oi->ifp->ifindex); |
611 | ||
718e3744 | 612 | /* Rewrite the md5 signature & update the seq */ |
613 | ospf_make_md5_digest (oi, op); | |
614 | ||
37ccfa3d | 615 | /* Retrieve OSPF packet type. */ |
616 | stream_set_getp (op->s, 1); | |
617 | type = stream_getc (op->s); | |
618 | ||
68b7339a | 619 | /* reset get pointer */ |
620 | stream_set_getp (op->s, 0); | |
621 | ||
622 | memset (&iph, 0, sizeof (struct ip)); | |
718e3744 | 623 | memset (&sa_dst, 0, sizeof (sa_dst)); |
68b7339a | 624 | |
718e3744 | 625 | sa_dst.sin_family = AF_INET; |
626 | #ifdef HAVE_SIN_LEN | |
627 | sa_dst.sin_len = sizeof(sa_dst); | |
628 | #endif /* HAVE_SIN_LEN */ | |
629 | sa_dst.sin_addr = op->dst; | |
630 | sa_dst.sin_port = htons (0); | |
631 | ||
632 | /* Set DONTROUTE flag if dst is unicast. */ | |
633 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
634 | if (!IN_MULTICAST (htonl (op->dst.s_addr))) | |
635 | flags = MSG_DONTROUTE; | |
636 | ||
68b7339a | 637 | iph.ip_hl = sizeof (struct ip) >> OSPF_WRITE_IPHL_SHIFT; |
638 | /* it'd be very strange for header to not be 4byte-word aligned but.. */ | |
6c835671 | 639 | if ( sizeof (struct ip) |
640 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) ) | |
68b7339a | 641 | iph.ip_hl++; /* we presume sizeof struct ip cant overflow ip_hl.. */ |
642 | ||
718e3744 | 643 | iph.ip_v = IPVERSION; |
68980084 | 644 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; |
68b7339a | 645 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; |
68b7339a | 646 | |
0bfeca3f | 647 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 648 | /* XXX-MT: not thread-safe at all.. |
649 | * XXX: this presumes this is only programme sending OSPF packets | |
650 | * otherwise, no guarantee ipid will be unique | |
651 | */ | |
652 | iph.ip_id = ++ipid; | |
0bfeca3f | 653 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
654 | ||
718e3744 | 655 | iph.ip_off = 0; |
656 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
657 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
658 | else | |
659 | iph.ip_ttl = OSPF_IP_TTL; | |
660 | iph.ip_p = IPPROTO_OSPFIGP; | |
661 | iph.ip_sum = 0; | |
662 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
663 | iph.ip_dst.s_addr = op->dst.s_addr; | |
664 | ||
665 | memset (&msg, 0, sizeof (msg)); | |
68defd6d | 666 | msg.msg_name = (caddr_t) &sa_dst; |
718e3744 | 667 | msg.msg_namelen = sizeof (sa_dst); |
668 | msg.msg_iov = iov; | |
669 | msg.msg_iovlen = 2; | |
670 | iov[0].iov_base = (char*)&iph; | |
68b7339a | 671 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; |
672 | iov[1].iov_base = STREAM_PNT (op->s); | |
718e3744 | 673 | iov[1].iov_len = op->length; |
68b7339a | 674 | |
675 | /* Sadly we can not rely on kernels to fragment packets because of either | |
676 | * IP_HDRINCL and/or multicast destination being set. | |
677 | */ | |
0bfeca3f | 678 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 679 | if ( op->length > maxdatasize ) |
62d8e96a | 680 | ospf_write_frags (ospf->fd, op, &iph, &msg, maxdatasize, |
681 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 682 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 683 | |
68b7339a | 684 | /* send final fragment (could be first) */ |
18b12c38 | 685 | sockopt_iphdrincl_swab_htosys (&iph); |
68980084 | 686 | ret = sendmsg (ospf->fd, &msg, flags); |
6b333611 | 687 | sockopt_iphdrincl_swab_systoh (&iph); |
718e3744 | 688 | |
689 | if (ret < 0) | |
083ee9d9 | 690 | zlog_warn ("*** sendmsg in ospf_write failed to %s, " |
5dcbdf82 | 691 | "id %d, off %d, len %d, interface %s, mtu %u: %s", |
083ee9d9 | 692 | inet_ntoa (iph.ip_dst), iph.ip_id, iph.ip_off, iph.ip_len, |
5dcbdf82 | 693 | oi->ifp->name, oi->ifp->mtu, safe_strerror (errno)); |
718e3744 | 694 | |
718e3744 | 695 | /* Show debug sending packet. */ |
696 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) | |
697 | { | |
698 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
699 | { | |
2a42e285 | 700 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 701 | ospf_ip_header_dump (&iph); |
718e3744 | 702 | stream_set_getp (op->s, 0); |
703 | ospf_packet_dump (op->s); | |
704 | } | |
705 | ||
2a42e285 | 706 | zlog_debug ("%s sent to [%s] via [%s].", |
718e3744 | 707 | ospf_packet_type_str[type], inet_ntoa (op->dst), |
708 | IF_NAME (oi)); | |
709 | ||
710 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
2a42e285 | 711 | zlog_debug ("-----------------------------------------------------"); |
718e3744 | 712 | } |
713 | ||
714 | /* Now delete packet from queue. */ | |
715 | ospf_packet_delete (oi); | |
716 | ||
717 | if (ospf_fifo_head (oi->obuf) == NULL) | |
718 | { | |
719 | oi->on_write_q = 0; | |
68980084 | 720 | list_delete_node (ospf->oi_write_q, node); |
718e3744 | 721 | } |
722 | ||
723 | /* If packets still remain in queue, call write thread. */ | |
68980084 | 724 | if (!list_isempty (ospf->oi_write_q)) |
725 | ospf->t_write = | |
726 | thread_add_write (master, ospf_write, ospf, ospf->fd); | |
718e3744 | 727 | |
728 | return 0; | |
729 | } | |
730 | ||
731 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
4dadc291 | 732 | static void |
718e3744 | 733 | ospf_hello (struct ip *iph, struct ospf_header *ospfh, |
734 | struct stream * s, struct ospf_interface *oi, int size) | |
735 | { | |
736 | struct ospf_hello *hello; | |
737 | struct ospf_neighbor *nbr; | |
718e3744 | 738 | int old_state; |
d3f0d621 | 739 | struct prefix p; |
718e3744 | 740 | |
741 | /* increment statistics. */ | |
742 | oi->hello_in++; | |
743 | ||
744 | hello = (struct ospf_hello *) STREAM_PNT (s); | |
745 | ||
746 | /* If Hello is myself, silently discard. */ | |
68980084 | 747 | if (IPV4_ADDR_SAME (&ospfh->router_id, &oi->ospf->router_id)) |
d324181c | 748 | { |
749 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
750 | { | |
2a42e285 | 751 | zlog_debug ("ospf_header[%s/%s]: selforiginated, " |
d324181c | 752 | "dropping.", |
753 | ospf_packet_type_str[ospfh->type], | |
754 | inet_ntoa (iph->ip_src)); | |
755 | } | |
756 | return; | |
757 | } | |
718e3744 | 758 | |
759 | /* If incoming interface is passive one, ignore Hello. */ | |
f2c80652 | 760 | if (OSPF_IF_PARAM (oi, passive_interface) == OSPF_IF_PASSIVE) { |
ba6454ec | 761 | char buf[3][INET_ADDRSTRLEN]; |
762 | zlog_warn("Warning: ignoring HELLO from router %s sent to %s; we " | |
763 | "should not receive hellos on passive interface %s!", | |
764 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], sizeof(buf[0])), | |
765 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
766 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
767 | buf[2], sizeof(buf[2]))); | |
768 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
769 | { | |
770 | /* Try to fix multicast membership. */ | |
771 | SET_FLAG(oi->multicast_memberships, MEMBER_ALLROUTERS); | |
772 | ospf_if_set_multicast(oi); | |
773 | } | |
718e3744 | 774 | return; |
f2c80652 | 775 | } |
718e3744 | 776 | |
777 | /* get neighbor prefix. */ | |
778 | p.family = AF_INET; | |
779 | p.prefixlen = ip_masklen (hello->network_mask); | |
780 | p.u.prefix4 = iph->ip_src; | |
781 | ||
782 | /* Compare network mask. */ | |
783 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
784 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
785 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
786 | if (oi->address->prefixlen != p.prefixlen) | |
787 | { | |
788 | zlog_warn ("Packet %s [Hello:RECV]: NetworkMask mismatch.", | |
789 | inet_ntoa (ospfh->router_id)); | |
790 | return; | |
791 | } | |
792 | ||
793 | /* Compare Hello Interval. */ | |
794 | if (OSPF_IF_PARAM (oi, v_hello) != ntohs (hello->hello_interval)) | |
795 | { | |
796 | zlog_warn ("Packet %s [Hello:RECV]: HelloInterval mismatch.", | |
797 | inet_ntoa (ospfh->router_id)); | |
798 | return; | |
799 | } | |
800 | ||
801 | /* Compare Router Dead Interval. */ | |
802 | if (OSPF_IF_PARAM (oi, v_wait) != ntohl (hello->dead_interval)) | |
803 | { | |
804 | zlog_warn ("Packet %s [Hello:RECV]: RouterDeadInterval mismatch.", | |
805 | inet_ntoa (ospfh->router_id)); | |
806 | return; | |
807 | } | |
808 | ||
809 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 810 | zlog_debug ("Packet %s [Hello:RECV]: Options %s", |
718e3744 | 811 | inet_ntoa (ospfh->router_id), |
812 | ospf_options_dump (hello->options)); | |
813 | ||
814 | /* Compare options. */ | |
815 | #define REJECT_IF_TBIT_ON 1 /* XXX */ | |
816 | #ifdef REJECT_IF_TBIT_ON | |
817 | if (CHECK_FLAG (hello->options, OSPF_OPTION_T)) | |
818 | { | |
819 | /* | |
820 | * This router does not support non-zero TOS. | |
821 | * Drop this Hello packet not to establish neighbor relationship. | |
822 | */ | |
823 | zlog_warn ("Packet %s [Hello:RECV]: T-bit on, drop it.", | |
824 | inet_ntoa (ospfh->router_id)); | |
825 | return; | |
826 | } | |
827 | #endif /* REJECT_IF_TBIT_ON */ | |
828 | ||
829 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 830 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
718e3744 | 831 | && CHECK_FLAG (hello->options, OSPF_OPTION_O)) |
832 | { | |
833 | /* | |
834 | * This router does know the correct usage of O-bit | |
835 | * the bit should be set in DD packet only. | |
836 | */ | |
837 | zlog_warn ("Packet %s [Hello:RECV]: O-bit abuse?", | |
838 | inet_ntoa (ospfh->router_id)); | |
839 | #ifdef STRICT_OBIT_USAGE_CHECK | |
840 | return; /* Reject this packet. */ | |
841 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
842 | UNSET_FLAG (hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
843 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
844 | } | |
845 | #endif /* HAVE_OPAQUE_LSA */ | |
846 | ||
847 | /* new for NSSA is to ensure that NP is on and E is off */ | |
848 | ||
718e3744 | 849 | if (oi->area->external_routing == OSPF_AREA_NSSA) |
850 | { | |
851 | if (! (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_NP) | |
852 | && CHECK_FLAG (hello->options, OSPF_OPTION_NP) | |
853 | && ! CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) | |
854 | && ! CHECK_FLAG (hello->options, OSPF_OPTION_E))) | |
855 | { | |
856 | zlog_warn ("NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", inet_ntoa (ospfh->router_id), OPTIONS (oi), hello->options); | |
857 | return; | |
858 | } | |
859 | if (IS_DEBUG_OSPF_NSSA) | |
2a42e285 | 860 | zlog_debug ("NSSA-Hello:RECV:Packet from %s:", inet_ntoa(ospfh->router_id)); |
718e3744 | 861 | } |
862 | else | |
718e3744 | 863 | /* The setting of the E-bit found in the Hello Packet's Options |
864 | field must match this area's ExternalRoutingCapability A | |
865 | mismatch causes processing to stop and the packet to be | |
866 | dropped. The setting of the rest of the bits in the Hello | |
867 | Packet's Options field should be ignored. */ | |
868 | if (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) != | |
869 | CHECK_FLAG (hello->options, OSPF_OPTION_E)) | |
870 | { | |
3aa8d5f9 | 871 | zlog_warn ("Packet %s [Hello:RECV]: my options: %x, his options %x", |
872 | inet_ntoa(ospfh->router_id), OPTIONS (oi), hello->options); | |
718e3744 | 873 | return; |
874 | } | |
718e3744 | 875 | |
d3f0d621 | 876 | /* get neighbour struct */ |
877 | nbr = ospf_nbr_get (oi, ospfh, iph, &p); | |
878 | ||
879 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
880 | assert (nbr); | |
718e3744 | 881 | |
882 | old_state = nbr->state; | |
883 | ||
884 | /* Add event to thread. */ | |
885 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_HelloReceived); | |
886 | ||
887 | /* RFC2328 Section 9.5.1 | |
888 | If the router is not eligible to become Designated Router, | |
889 | (snip) It must also send an Hello Packet in reply to an | |
890 | Hello Packet received from any eligible neighbor (other than | |
891 | the current Designated Router and Backup Designated Router). */ | |
892 | if (oi->type == OSPF_IFTYPE_NBMA) | |
893 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
894 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
895 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
896 | OSPF_NSM_TIMER_ON (nbr->t_hello_reply, ospf_hello_reply_timer, | |
897 | OSPF_HELLO_REPLY_DELAY); | |
898 | ||
899 | /* on NBMA network type, it happens to receive bidirectional Hello packet | |
900 | without advance 1-Way Received event. | |
901 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
902 | if (oi->type == OSPF_IFTYPE_NBMA && | |
903 | (old_state == NSM_Down || old_state == NSM_Attempt)) | |
904 | { | |
905 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_OneWayReceived); | |
906 | nbr->priority = hello->priority; | |
907 | nbr->d_router = hello->d_router; | |
908 | nbr->bd_router = hello->bd_router; | |
909 | return; | |
910 | } | |
911 | ||
68980084 | 912 | if (ospf_nbr_bidirectional (&oi->ospf->router_id, hello->neighbors, |
718e3744 | 913 | size - OSPF_HELLO_MIN_SIZE)) |
914 | { | |
915 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived); | |
916 | nbr->options |= hello->options; | |
917 | } | |
918 | else | |
919 | { | |
920 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_OneWayReceived); | |
921 | /* Set neighbor information. */ | |
922 | nbr->priority = hello->priority; | |
923 | nbr->d_router = hello->d_router; | |
924 | nbr->bd_router = hello->bd_router; | |
925 | return; | |
926 | } | |
927 | ||
928 | /* If neighbor itself declares DR and no BDR exists, | |
929 | cause event BackupSeen */ | |
930 | if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router)) | |
931 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
932 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
933 | ||
934 | /* neighbor itself declares BDR. */ | |
935 | if (oi->state == ISM_Waiting && | |
936 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router)) | |
937 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
938 | ||
939 | /* had not previously. */ | |
940 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router) && | |
941 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->d_router)) || | |
942 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->d_router) && | |
943 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->d_router))) | |
944 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
945 | ||
946 | /* had not previously. */ | |
947 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router) && | |
948 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->bd_router)) || | |
949 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->bd_router) && | |
950 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->bd_router))) | |
951 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
952 | ||
953 | /* Neighbor priority check. */ | |
954 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
955 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
956 | ||
957 | /* Set neighbor information. */ | |
958 | nbr->priority = hello->priority; | |
959 | nbr->d_router = hello->d_router; | |
960 | nbr->bd_router = hello->bd_router; | |
961 | } | |
962 | ||
963 | /* Save DD flags/options/Seqnum received. */ | |
4dadc291 | 964 | static void |
718e3744 | 965 | ospf_db_desc_save_current (struct ospf_neighbor *nbr, |
966 | struct ospf_db_desc *dd) | |
967 | { | |
968 | nbr->last_recv.flags = dd->flags; | |
969 | nbr->last_recv.options = dd->options; | |
970 | nbr->last_recv.dd_seqnum = ntohl (dd->dd_seqnum); | |
971 | } | |
972 | ||
973 | /* Process rest of DD packet. */ | |
974 | static void | |
975 | ospf_db_desc_proc (struct stream *s, struct ospf_interface *oi, | |
976 | struct ospf_neighbor *nbr, struct ospf_db_desc *dd, | |
977 | u_int16_t size) | |
978 | { | |
979 | struct ospf_lsa *new, *find; | |
980 | struct lsa_header *lsah; | |
981 | ||
9985f83c | 982 | stream_forward_getp (s, OSPF_DB_DESC_MIN_SIZE); |
718e3744 | 983 | for (size -= OSPF_DB_DESC_MIN_SIZE; |
984 | size >= OSPF_LSA_HEADER_SIZE; size -= OSPF_LSA_HEADER_SIZE) | |
985 | { | |
986 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
9985f83c | 987 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 988 | |
989 | /* Unknown LS type. */ | |
990 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
991 | { | |
bec595ad | 992 | zlog_warn ("Packet [DD:RECV]: Unknown LS type %d.", lsah->type); |
718e3744 | 993 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
994 | return; | |
995 | } | |
996 | ||
997 | #ifdef HAVE_OPAQUE_LSA | |
998 | if (IS_OPAQUE_LSA (lsah->type) | |
999 | && ! CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1000 | { | |
1001 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1002 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1003 | return; | |
1004 | } | |
1005 | #endif /* HAVE_OPAQUE_LSA */ | |
1006 | ||
1007 | switch (lsah->type) | |
1008 | { | |
1009 | case OSPF_AS_EXTERNAL_LSA: | |
1010 | #ifdef HAVE_OPAQUE_LSA | |
1011 | case OSPF_OPAQUE_AS_LSA: | |
1012 | #endif /* HAVE_OPAQUE_LSA */ | |
718e3744 | 1013 | /* Check for stub area. Reject if AS-External from stub but |
1014 | allow if from NSSA. */ | |
1015 | if (oi->area->external_routing == OSPF_AREA_STUB) | |
718e3744 | 1016 | { |
1017 | zlog_warn ("Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", | |
1018 | lsah->type, inet_ntoa (lsah->id), | |
1019 | (oi->area->external_routing == OSPF_AREA_STUB) ?\ | |
1020 | "STUB" : "NSSA"); | |
1021 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1022 | return; | |
1023 | } | |
1024 | break; | |
1025 | default: | |
1026 | break; | |
1027 | } | |
1028 | ||
1029 | /* Create LS-request object. */ | |
1030 | new = ospf_ls_request_new (lsah); | |
1031 | ||
1032 | /* Lookup received LSA, then add LS request list. */ | |
1033 | find = ospf_lsa_lookup_by_header (oi->area, lsah); | |
1034 | if (!find || ospf_lsa_more_recent (find, new) < 0) | |
1035 | { | |
1036 | ospf_ls_request_add (nbr, new); | |
1037 | ospf_lsa_discard (new); | |
1038 | } | |
1039 | else | |
1040 | { | |
1041 | /* Received LSA is not recent. */ | |
1042 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1043 | zlog_debug ("Packet [DD:RECV]: LSA received Type %d, " |
718e3744 | 1044 | "ID %s is not recent.", lsah->type, inet_ntoa (lsah->id)); |
1045 | ospf_lsa_discard (new); | |
1046 | continue; | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | /* Master */ | |
1051 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1052 | { | |
1053 | nbr->dd_seqnum++; | |
1054 | /* Entire DD packet sent. */ | |
1055 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) | |
1056 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
1057 | else | |
1058 | /* Send new DD packet. */ | |
1059 | ospf_db_desc_send (nbr); | |
1060 | } | |
1061 | /* Slave */ | |
1062 | else | |
1063 | { | |
1064 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); | |
1065 | ||
1066 | /* When master's more flags is not set. */ | |
1067 | if (!IS_SET_DD_M (dd->flags) && ospf_db_summary_isempty (nbr)) | |
1068 | { | |
1069 | nbr->dd_flags &= ~(OSPF_DD_FLAG_M); | |
1070 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
1071 | } | |
1072 | ||
bec595ad | 1073 | /* Send DD packet in reply. */ |
718e3744 | 1074 | ospf_db_desc_send (nbr); |
1075 | } | |
1076 | ||
1077 | /* Save received neighbor values from DD. */ | |
1078 | ospf_db_desc_save_current (nbr, dd); | |
1079 | } | |
1080 | ||
4dadc291 | 1081 | static int |
718e3744 | 1082 | ospf_db_desc_is_dup (struct ospf_db_desc *dd, struct ospf_neighbor *nbr) |
1083 | { | |
1084 | /* Is DD duplicated? */ | |
1085 | if (dd->options == nbr->last_recv.options && | |
1086 | dd->flags == nbr->last_recv.flags && | |
1087 | dd->dd_seqnum == htonl (nbr->last_recv.dd_seqnum)) | |
1088 | return 1; | |
1089 | ||
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
3aa8d5f9 | 1094 | static void |
718e3744 | 1095 | ospf_db_desc (struct ip *iph, struct ospf_header *ospfh, |
1096 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1097 | { | |
1098 | struct ospf_db_desc *dd; | |
1099 | struct ospf_neighbor *nbr; | |
1100 | ||
1101 | /* Increment statistics. */ | |
1102 | oi->db_desc_in++; | |
1103 | ||
1104 | dd = (struct ospf_db_desc *) STREAM_PNT (s); | |
d363df2c | 1105 | |
d3f0d621 | 1106 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1107 | if (nbr == NULL) |
1108 | { | |
1109 | zlog_warn ("Packet[DD]: Unknown Neighbor %s", | |
1110 | inet_ntoa (ospfh->router_id)); | |
1111 | return; | |
1112 | } | |
1113 | ||
1114 | /* Check MTU. */ | |
1115 | if (ntohs (dd->mtu) > oi->ifp->mtu) | |
1116 | { | |
3aa8d5f9 | 1117 | zlog_warn ("Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", |
1118 | inet_ntoa (nbr->router_id), ntohs (dd->mtu), | |
1119 | IF_NAME (oi), oi->ifp->mtu); | |
718e3744 | 1120 | return; |
1121 | } | |
1122 | ||
d363df2c | 1123 | /* |
1124 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is not | |
1125 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1126 | * Until proper solution is developped, this hack should help. | |
1127 | * | |
1128 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1129 | * options, unfortunately its use in DD options is not specified. Hence some | |
1130 | * implementations follow E-bit semantics and set it in DD options, and some | |
1131 | * treat it as unspecified and hence follow the directive "default for | |
1132 | * options is clear", ie unset. | |
1133 | * | |
1134 | * Reset the flag, as ospfd follows E-bit semantics. | |
1135 | */ | |
1136 | if ( (oi->area->external_routing == OSPF_AREA_NSSA) | |
1137 | && (CHECK_FLAG (nbr->options, OSPF_OPTION_NP)) | |
1138 | && (!CHECK_FLAG (dd->options, OSPF_OPTION_NP)) ) | |
1139 | { | |
1140 | if (IS_DEBUG_OSPF_EVENT) | |
1210fa66 | 1141 | zlog_debug ("Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", |
d363df2c | 1142 | inet_ntoa (nbr->router_id) ); |
1143 | SET_FLAG (dd->options, OSPF_OPTION_NP); | |
1144 | } | |
d363df2c | 1145 | |
718e3744 | 1146 | #ifdef REJECT_IF_TBIT_ON |
1147 | if (CHECK_FLAG (dd->options, OSPF_OPTION_T)) | |
1148 | { | |
1149 | /* | |
1150 | * In Hello protocol, optional capability must have checked | |
1151 | * to prevent this T-bit enabled router be my neighbor. | |
1152 | */ | |
1153 | zlog_warn ("Packet[DD]: Neighbor %s: T-bit on?", inet_ntoa (nbr->router_id)); | |
1154 | return; | |
1155 | } | |
1156 | #endif /* REJECT_IF_TBIT_ON */ | |
1157 | ||
1158 | #ifdef HAVE_OPAQUE_LSA | |
1159 | if (CHECK_FLAG (dd->options, OSPF_OPTION_O) | |
68980084 | 1160 | && !CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1161 | { |
1162 | /* | |
1163 | * This node is not configured to handle O-bit, for now. | |
1164 | * Clear it to ignore unsupported capability proposed by neighbor. | |
1165 | */ | |
1166 | UNSET_FLAG (dd->options, OSPF_OPTION_O); | |
1167 | } | |
1168 | #endif /* HAVE_OPAQUE_LSA */ | |
1169 | ||
1170 | /* Process DD packet by neighbor status. */ | |
1171 | switch (nbr->state) | |
1172 | { | |
1173 | case NSM_Down: | |
1174 | case NSM_Attempt: | |
1175 | case NSM_TwoWay: | |
bec595ad | 1176 | zlog_warn ("Packet[DD]: Neighbor %s state is %s, packet discarded.", |
3aa8d5f9 | 1177 | inet_ntoa(nbr->router_id), |
718e3744 | 1178 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1179 | break; | |
1180 | case NSM_Init: | |
1181 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived); | |
1182 | /* If the new state is ExStart, the processing of the current | |
1183 | packet should then continue in this new state by falling | |
1184 | through to case ExStart below. */ | |
1185 | if (nbr->state != NSM_ExStart) | |
1186 | break; | |
1187 | case NSM_ExStart: | |
1188 | /* Initial DBD */ | |
1189 | if ((IS_SET_DD_ALL (dd->flags) == OSPF_DD_FLAG_ALL) && | |
1190 | (size == OSPF_DB_DESC_MIN_SIZE)) | |
1191 | { | |
68980084 | 1192 | if (IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) > 0) |
718e3744 | 1193 | { |
1194 | /* We're Slave---obey */ | |
17eaa728 | 1195 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Slave).", |
3aa8d5f9 | 1196 | inet_ntoa(nbr->router_id)); |
718e3744 | 1197 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); |
1198 | nbr->dd_flags &= ~(OSPF_DD_FLAG_MS|OSPF_DD_FLAG_I); /* Reset I/MS */ | |
1199 | } | |
1200 | else | |
1201 | { | |
1202 | /* We're Master, ignore the initial DBD from Slave */ | |
3aa8d5f9 | 1203 | zlog_warn ("Packet[DD]: Neighbor %s: Initial DBD from Slave, " |
1204 | "ignoring.", inet_ntoa(nbr->router_id)); | |
718e3744 | 1205 | break; |
1206 | } | |
1207 | } | |
1208 | /* Ack from the Slave */ | |
1209 | else if (!IS_SET_DD_MS (dd->flags) && !IS_SET_DD_I (dd->flags) && | |
1210 | ntohl (dd->dd_seqnum) == nbr->dd_seqnum && | |
68980084 | 1211 | IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) < 0) |
718e3744 | 1212 | { |
17eaa728 | 1213 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Master).", |
3aa8d5f9 | 1214 | inet_ntoa(nbr->router_id)); |
718e3744 | 1215 | nbr->dd_flags &= ~OSPF_DD_FLAG_I; |
1216 | } | |
1217 | else | |
1218 | { | |
3aa8d5f9 | 1219 | zlog_warn ("Packet[DD]: Neighbor %s Negotiation fails.", |
1220 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1221 | break; |
1222 | } | |
1223 | ||
1224 | /* This is where the real Options are saved */ | |
1225 | nbr->options = dd->options; | |
1226 | ||
1227 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 1228 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1229 | { |
1230 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1231 | zlog_debug ("Neighbor[%s] is %sOpaque-capable.", |
718e3744 | 1232 | inet_ntoa (nbr->router_id), |
1233 | CHECK_FLAG (nbr->options, OSPF_OPTION_O) ? "" : "NOT "); | |
1234 | ||
1235 | if (! CHECK_FLAG (nbr->options, OSPF_OPTION_O) | |
1236 | && IPV4_ADDR_SAME (&DR (oi), &nbr->address.u.prefix4)) | |
1237 | { | |
1238 | zlog_warn ("DR-neighbor[%s] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.", inet_ntoa (nbr->router_id)); | |
1239 | /* This situation is undesirable, but not a real error. */ | |
1240 | } | |
1241 | } | |
1242 | #endif /* HAVE_OPAQUE_LSA */ | |
1243 | ||
1244 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_NegotiationDone); | |
1245 | ||
1246 | /* continue processing rest of packet. */ | |
1247 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1248 | break; | |
1249 | case NSM_Exchange: | |
1250 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1251 | { | |
1252 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1253 | /* Master: discard duplicated DD packet. */ | |
3aa8d5f9 | 1254 | zlog_warn ("Packet[DD] (Master): Neighbor %s packet duplicated.", |
1255 | inet_ntoa (nbr->router_id)); | |
718e3744 | 1256 | else |
1257 | /* Slave: cause to retransmit the last Database Description. */ | |
1258 | { | |
3aa8d5f9 | 1259 | zlog_warn ("Packet[DD] [Slave]: Neighbor %s packet duplicated.", |
1260 | inet_ntoa (nbr->router_id)); | |
718e3744 | 1261 | ospf_db_desc_resend (nbr); |
1262 | } | |
1263 | break; | |
1264 | } | |
1265 | ||
1266 | /* Otherwise DD packet should be checked. */ | |
1267 | /* Check Master/Slave bit mismatch */ | |
1268 | if (IS_SET_DD_MS (dd->flags) != IS_SET_DD_MS (nbr->last_recv.flags)) | |
1269 | { | |
3aa8d5f9 | 1270 | zlog_warn ("Packet[DD]: Neighbor %s MS-bit mismatch.", |
1271 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1272 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1273 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1274 | zlog_debug ("Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", |
3aa8d5f9 | 1275 | dd->flags, nbr->dd_flags); |
718e3744 | 1276 | break; |
1277 | } | |
1278 | ||
1279 | /* Check initialize bit is set. */ | |
1280 | if (IS_SET_DD_I (dd->flags)) | |
1281 | { | |
3aa8d5f9 | 1282 | zlog_warn ("Packet[DD]: Neighbor %s I-bit set.", |
1283 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1284 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1285 | break; | |
1286 | } | |
1287 | ||
1288 | /* Check DD Options. */ | |
1289 | if (dd->options != nbr->options) | |
1290 | { | |
1291 | #ifdef ORIGINAL_CODING | |
1292 | /* Save the new options for debugging */ | |
1293 | nbr->options = dd->options; | |
1294 | #endif /* ORIGINAL_CODING */ | |
3aa8d5f9 | 1295 | zlog_warn ("Packet[DD]: Neighbor %s options mismatch.", |
1296 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1297 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1298 | break; | |
1299 | } | |
1300 | ||
1301 | /* Check DD sequence number. */ | |
1302 | if ((IS_SET_DD_MS (nbr->dd_flags) && | |
1303 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum) || | |
1304 | (!IS_SET_DD_MS (nbr->dd_flags) && | |
1305 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum + 1)) | |
1306 | { | |
3aa8d5f9 | 1307 | zlog_warn ("Packet[DD]: Neighbor %s sequence number mismatch.", |
1308 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1309 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1310 | break; | |
1311 | } | |
1312 | ||
1313 | /* Continue processing rest of packet. */ | |
1314 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1315 | break; | |
1316 | case NSM_Loading: | |
1317 | case NSM_Full: | |
1318 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1319 | { | |
1320 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1321 | { | |
1322 | /* Master should discard duplicate DD packet. */ | |
3aa8d5f9 | 1323 | zlog_warn("Packet[DD]: Neighbor %s duplicated, packet discarded.", |
1324 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1325 | break; |
1326 | } | |
1327 | else | |
1328 | { | |
1329 | struct timeval t, now; | |
1330 | gettimeofday (&now, NULL); | |
1331 | t = tv_sub (now, nbr->last_send_ts); | |
1332 | if (tv_cmp (t, int2tv (nbr->v_inactivity)) < 0) | |
1333 | { | |
1334 | /* In states Loading and Full the slave must resend | |
1335 | its last Database Description packet in response to | |
1336 | duplicate Database Description packets received | |
1337 | from the master. For this reason the slave must | |
1338 | wait RouterDeadInterval seconds before freeing the | |
1339 | last Database Description packet. Reception of a | |
1340 | Database Description packet from the master after | |
1341 | this interval will generate a SeqNumberMismatch | |
1342 | neighbor event. RFC2328 Section 10.8 */ | |
1343 | ospf_db_desc_resend (nbr); | |
1344 | break; | |
1345 | } | |
1346 | } | |
1347 | } | |
1348 | ||
1349 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1350 | break; | |
1351 | default: | |
3aa8d5f9 | 1352 | zlog_warn ("Packet[DD]: Neighbor %s NSM illegal status %u.", |
1353 | inet_ntoa(nbr->router_id), nbr->state); | |
718e3744 | 1354 | break; |
1355 | } | |
1356 | } | |
1357 | ||
1358 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1359 | ||
1360 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
4dadc291 | 1361 | static void |
718e3744 | 1362 | ospf_ls_req (struct ip *iph, struct ospf_header *ospfh, |
1363 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1364 | { | |
1365 | struct ospf_neighbor *nbr; | |
1366 | u_int32_t ls_type; | |
1367 | struct in_addr ls_id; | |
1368 | struct in_addr adv_router; | |
1369 | struct ospf_lsa *find; | |
52dc7ee6 | 1370 | struct list *ls_upd; |
6c835671 | 1371 | unsigned int length; |
718e3744 | 1372 | |
1373 | /* Increment statistics. */ | |
1374 | oi->ls_req_in++; | |
1375 | ||
d3f0d621 | 1376 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1377 | if (nbr == NULL) |
1378 | { | |
1379 | zlog_warn ("Link State Request: Unknown Neighbor %s.", | |
1380 | inet_ntoa (ospfh->router_id)); | |
1381 | return; | |
1382 | } | |
1383 | ||
1384 | /* Neighbor State should be Exchange or later. */ | |
1385 | if (nbr->state != NSM_Exchange && | |
1386 | nbr->state != NSM_Loading && | |
1387 | nbr->state != NSM_Full) | |
1388 | { | |
bec595ad | 1389 | zlog_warn ("Link State Request received from %s: " |
1390 | "Neighbor state is %s, packet discarded.", | |
1391 | inet_ntoa (ospfh->router_id), | |
718e3744 | 1392 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1393 | return; | |
1394 | } | |
1395 | ||
1396 | /* Send Link State Update for ALL requested LSAs. */ | |
1397 | ls_upd = list_new (); | |
1398 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1399 | ||
1400 | while (size >= OSPF_LSA_KEY_SIZE) | |
1401 | { | |
1402 | /* Get one slice of Link State Request. */ | |
1403 | ls_type = stream_getl (s); | |
1404 | ls_id.s_addr = stream_get_ipv4 (s); | |
1405 | adv_router.s_addr = stream_get_ipv4 (s); | |
1406 | ||
1407 | /* Verify LSA type. */ | |
1408 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) | |
1409 | { | |
1410 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1411 | list_delete (ls_upd); | |
1412 | return; | |
1413 | } | |
1414 | ||
1415 | /* Search proper LSA in LSDB. */ | |
1416 | find = ospf_lsa_lookup (oi->area, ls_type, ls_id, adv_router); | |
1417 | if (find == NULL) | |
1418 | { | |
1419 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1420 | list_delete (ls_upd); | |
1421 | return; | |
1422 | } | |
1423 | ||
86f1fd96 | 1424 | /* Packet overflows MTU size, send immediately. */ |
1425 | if (length + ntohs (find->data->length) > ospf_packet_max (oi)) | |
718e3744 | 1426 | { |
1427 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1428 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1429 | else | |
1430 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1431 | ||
1432 | /* Only remove list contents. Keep ls_upd. */ | |
1433 | list_delete_all_node (ls_upd); | |
1434 | ||
1435 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1436 | } | |
1437 | ||
1438 | /* Append LSA to update list. */ | |
1439 | listnode_add (ls_upd, find); | |
1440 | length += ntohs (find->data->length); | |
1441 | ||
1442 | size -= OSPF_LSA_KEY_SIZE; | |
1443 | } | |
1444 | ||
1445 | /* Send rest of Link State Update. */ | |
1446 | if (listcount (ls_upd) > 0) | |
1447 | { | |
1448 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1449 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1450 | else | |
1451 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1452 | ||
1453 | list_delete (ls_upd); | |
1454 | } | |
1455 | else | |
1456 | list_free (ls_upd); | |
1457 | } | |
1458 | ||
1459 | /* Get the list of LSAs from Link State Update packet. | |
1460 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
52dc7ee6 | 1461 | static struct list * |
718e3744 | 1462 | ospf_ls_upd_list_lsa (struct ospf_neighbor *nbr, struct stream *s, |
1463 | struct ospf_interface *oi, size_t size) | |
1464 | { | |
1465 | u_int16_t count, sum; | |
1466 | u_int32_t length; | |
1467 | struct lsa_header *lsah; | |
1468 | struct ospf_lsa *lsa; | |
52dc7ee6 | 1469 | struct list *lsas; |
718e3744 | 1470 | |
1471 | lsas = list_new (); | |
1472 | ||
1473 | count = stream_getl (s); | |
1474 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1475 | ||
1476 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
9985f83c | 1477 | size -= length, stream_forward_getp (s, length), count--) |
718e3744 | 1478 | { |
1479 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
1480 | length = ntohs (lsah->length); | |
1481 | ||
1482 | if (length > size) | |
1483 | { | |
1484 | zlog_warn ("Link State Update: LSA length exceeds packet size."); | |
1485 | break; | |
1486 | } | |
1487 | ||
1488 | /* Validate the LSA's LS checksum. */ | |
1489 | sum = lsah->checksum; | |
1490 | if (sum != ospf_lsa_checksum (lsah)) | |
1491 | { | |
1492 | zlog_warn ("Link State Update: LSA checksum error %x, %x.", | |
1493 | sum, lsah->checksum); | |
1494 | continue; | |
1495 | } | |
1496 | ||
1497 | /* Examine the LSA's LS type. */ | |
1498 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
1499 | { | |
1500 | zlog_warn ("Link State Update: Unknown LS type %d", lsah->type); | |
1501 | continue; | |
1502 | } | |
1503 | ||
1504 | /* | |
1505 | * What if the received LSA's age is greater than MaxAge? | |
1506 | * Treat it as a MaxAge case -- endo. | |
1507 | */ | |
1508 | if (ntohs (lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1509 | lsah->ls_age = htons (OSPF_LSA_MAXAGE); | |
1510 | ||
1511 | #ifdef HAVE_OPAQUE_LSA | |
1512 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1513 | { | |
1514 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1515 | if ((IS_OPAQUE_LSA(lsah->type) && | |
1516 | ! CHECK_FLAG (lsah->options, OSPF_OPTION_O)) | |
1517 | || (! IS_OPAQUE_LSA(lsah->type) && | |
1518 | CHECK_FLAG (lsah->options, OSPF_OPTION_O))) | |
1519 | { | |
1520 | /* | |
1521 | * This neighbor must know the exact usage of O-bit; | |
1522 | * the bit will be set in Type-9,10,11 LSAs only. | |
1523 | */ | |
1524 | zlog_warn ("LSA[Type%d:%s]: O-bit abuse?", lsah->type, inet_ntoa (lsah->id)); | |
1525 | continue; | |
1526 | } | |
1527 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
1528 | ||
1529 | /* Do not take in AS External Opaque-LSAs if we are a stub. */ | |
1530 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1531 | && nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1532 | { | |
1533 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1534 | zlog_debug ("LSA[Type%d:%s]: We are a stub, don't take this LSA.", lsah->type, inet_ntoa (lsah->id)); |
718e3744 | 1535 | continue; |
1536 | } | |
1537 | } | |
1538 | else if (IS_OPAQUE_LSA(lsah->type)) | |
1539 | { | |
1540 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1541 | continue; | |
1542 | } | |
1543 | #endif /* HAVE_OPAQUE_LSA */ | |
1544 | ||
1545 | /* Create OSPF LSA instance. */ | |
1546 | lsa = ospf_lsa_new (); | |
1547 | ||
1548 | /* We may wish to put some error checking if type NSSA comes in | |
1549 | and area not in NSSA mode */ | |
1550 | switch (lsah->type) | |
1551 | { | |
1552 | case OSPF_AS_EXTERNAL_LSA: | |
1553 | #ifdef HAVE_OPAQUE_LSA | |
1554 | case OSPF_OPAQUE_AS_LSA: | |
1555 | lsa->area = NULL; | |
1556 | break; | |
1557 | case OSPF_OPAQUE_LINK_LSA: | |
1558 | lsa->oi = oi; /* Remember incoming interface for flooding control. */ | |
1559 | /* Fallthrough */ | |
1560 | #endif /* HAVE_OPAQUE_LSA */ | |
1561 | default: | |
1562 | lsa->area = oi->area; | |
1563 | break; | |
1564 | } | |
1565 | ||
1566 | lsa->data = ospf_lsa_data_new (length); | |
1567 | memcpy (lsa->data, lsah, length); | |
1568 | ||
1569 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1570 | zlog_debug("LSA[Type%d:%s]: %p new LSA created with Link State Update", |
718e3744 | 1571 | lsa->data->type, inet_ntoa (lsa->data->id), lsa); |
1572 | listnode_add (lsas, lsa); | |
1573 | } | |
1574 | ||
1575 | return lsas; | |
1576 | } | |
1577 | ||
1578 | /* Cleanup Update list. */ | |
4dadc291 | 1579 | static void |
52dc7ee6 | 1580 | ospf_upd_list_clean (struct list *lsas) |
718e3744 | 1581 | { |
1eb8ef25 | 1582 | struct listnode *node, *nnode; |
718e3744 | 1583 | struct ospf_lsa *lsa; |
1584 | ||
1eb8ef25 | 1585 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
1586 | ospf_lsa_discard (lsa); | |
718e3744 | 1587 | |
1588 | list_delete (lsas); | |
1589 | } | |
1590 | ||
1591 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
4dadc291 | 1592 | static void |
718e3744 | 1593 | ospf_ls_upd (struct ip *iph, struct ospf_header *ospfh, |
1594 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1595 | { | |
1596 | struct ospf_neighbor *nbr; | |
52dc7ee6 | 1597 | struct list *lsas; |
718e3744 | 1598 | #ifdef HAVE_OPAQUE_LSA |
52dc7ee6 | 1599 | struct list *mylsa_acks, *mylsa_upds; |
718e3744 | 1600 | #endif /* HAVE_OPAQUE_LSA */ |
1eb8ef25 | 1601 | struct listnode *node, *nnode; |
718e3744 | 1602 | struct ospf_lsa *lsa = NULL; |
1603 | /* unsigned long ls_req_found = 0; */ | |
1604 | ||
1605 | /* Dis-assemble the stream, update each entry, re-encapsulate for flooding */ | |
1606 | ||
1607 | /* Increment statistics. */ | |
1608 | oi->ls_upd_in++; | |
1609 | ||
1610 | /* Check neighbor. */ | |
d3f0d621 | 1611 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1612 | if (nbr == NULL) |
1613 | { | |
1614 | zlog_warn ("Link State Update: Unknown Neighbor %s on int: %s", | |
1615 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); | |
1616 | return; | |
1617 | } | |
1618 | ||
1619 | /* Check neighbor state. */ | |
1620 | if (nbr->state < NSM_Exchange) | |
1621 | { | |
3aa8d5f9 | 1622 | zlog_warn ("Link State Update: " |
1623 | "Neighbor[%s] state %s is less than Exchange", | |
1624 | inet_ntoa (ospfh->router_id), | |
1625 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 1626 | return; |
1627 | } | |
1628 | ||
1629 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages | |
1630 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1631 | * of section 13. | |
1632 | */ | |
1633 | lsas = ospf_ls_upd_list_lsa (nbr, s, oi, size); | |
1634 | ||
1635 | #ifdef HAVE_OPAQUE_LSA | |
1636 | /* | |
1637 | * Prepare two kinds of lists to clean up unwanted self-originated | |
1638 | * Opaque-LSAs from the routing domain as soon as possible. | |
1639 | */ | |
1640 | mylsa_acks = list_new (); /* Let the sender cease retransmission. */ | |
1641 | mylsa_upds = list_new (); /* Flush target LSAs if necessary. */ | |
1642 | ||
1643 | /* | |
1644 | * If self-originated Opaque-LSAs that have flooded before restart | |
1645 | * are contained in the received LSUpd message, corresponding LSReq | |
1646 | * messages to be sent may have to be modified. | |
1647 | * To eliminate possible race conditions such that flushing and normal | |
1648 | * updating for the same LSA would take place alternately, this trick | |
1649 | * must be done before entering to the loop below. | |
1650 | */ | |
1651 | ospf_opaque_adjust_lsreq (nbr, lsas); | |
1652 | #endif /* HAVE_OPAQUE_LSA */ | |
1653 | ||
1654 | #define DISCARD_LSA(L,N) {\ | |
1655 | if (IS_DEBUG_OSPF_EVENT) \ | |
2a42e285 | 1656 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p Type-%d", N, lsa, (int) lsa->data->type); \ |
718e3744 | 1657 | ospf_lsa_discard (L); \ |
1658 | continue; } | |
1659 | ||
1660 | /* Process each LSA received in the one packet. */ | |
1eb8ef25 | 1661 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
718e3744 | 1662 | { |
1663 | struct ospf_lsa *ls_ret, *current; | |
1664 | int ret = 1; | |
1665 | ||
718e3744 | 1666 | if (IS_DEBUG_OSPF_NSSA) |
1667 | { | |
1668 | char buf1[INET_ADDRSTRLEN]; | |
1669 | char buf2[INET_ADDRSTRLEN]; | |
1670 | char buf3[INET_ADDRSTRLEN]; | |
1671 | ||
2a42e285 | 1672 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", |
718e3744 | 1673 | lsa->data->type, |
1674 | inet_ntop (AF_INET, &ospfh->router_id, | |
1675 | buf1, INET_ADDRSTRLEN), | |
1676 | inet_ntop (AF_INET, &lsa->data->id, | |
1677 | buf2, INET_ADDRSTRLEN), | |
1678 | inet_ntop (AF_INET, &lsa->data->adv_router, | |
1679 | buf3, INET_ADDRSTRLEN)); | |
1680 | } | |
718e3744 | 1681 | |
1682 | listnode_delete (lsas, lsa); /* We don't need it in list anymore */ | |
1683 | ||
1684 | /* Validate Checksum - Done above by ospf_ls_upd_list_lsa() */ | |
1685 | ||
1686 | /* LSA Type - Done above by ospf_ls_upd_list_lsa() */ | |
1687 | ||
1688 | /* Do not take in AS External LSAs if we are a stub or NSSA. */ | |
1689 | ||
1690 | /* Do not take in AS NSSA if this neighbor and we are not NSSA */ | |
1691 | ||
1692 | /* Do take in Type-7's if we are an NSSA */ | |
1693 | ||
1694 | /* If we are also an ABR, later translate them to a Type-5 packet */ | |
1695 | ||
1696 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1697 | translate them to a separate Type-5 packet. */ | |
1698 | ||
1699 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1700 | /* Reject from STUB or NSSA */ | |
1701 | if (nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1702 | { | |
1703 | DISCARD_LSA (lsa, 1); | |
718e3744 | 1704 | if (IS_DEBUG_OSPF_NSSA) |
2a42e285 | 1705 | zlog_debug("Incoming External LSA Discarded: We are NSSA/STUB Area"); |
718e3744 | 1706 | } |
1707 | ||
718e3744 | 1708 | if (lsa->data->type == OSPF_AS_NSSA_LSA) |
1709 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) | |
1710 | { | |
1711 | DISCARD_LSA (lsa,2); | |
1712 | if (IS_DEBUG_OSPF_NSSA) | |
2a42e285 | 1713 | zlog_debug("Incoming NSSA LSA Discarded: Not NSSA Area"); |
718e3744 | 1714 | } |
718e3744 | 1715 | |
1716 | /* Find the LSA in the current database. */ | |
1717 | ||
1718 | current = ospf_lsa_lookup_by_header (oi->area, lsa->data); | |
1719 | ||
1720 | /* If the LSA's LS age is equal to MaxAge, and there is currently | |
1721 | no instance of the LSA in the router's link state database, | |
1722 | and none of router's neighbors are in states Exchange or Loading, | |
1723 | then take the following actions. */ | |
1724 | ||
1725 | if (IS_LSA_MAXAGE (lsa) && !current && | |
68980084 | 1726 | (ospf_nbr_count (oi, NSM_Exchange) + |
1727 | ospf_nbr_count (oi, NSM_Loading)) == 0) | |
718e3744 | 1728 | { |
1729 | /* Response Link State Acknowledgment. */ | |
1730 | ospf_ls_ack_send (nbr, lsa); | |
1731 | ||
1732 | /* Discard LSA. */ | |
3aa8d5f9 | 1733 | zlog_warn("Link State Update[%s]: LS age is equal to MaxAge.", |
1734 | dump_lsa_key(lsa)); | |
718e3744 | 1735 | DISCARD_LSA (lsa, 3); |
1736 | } | |
1737 | ||
1738 | #ifdef HAVE_OPAQUE_LSA | |
1739 | if (IS_OPAQUE_LSA (lsa->data->type) | |
68980084 | 1740 | && IPV4_ADDR_SAME (&lsa->data->adv_router, &oi->ospf->router_id)) |
718e3744 | 1741 | { |
1742 | /* | |
1743 | * Even if initial flushing seems to be completed, there might | |
1744 | * be a case that self-originated LSA with MaxAge still remain | |
1745 | * in the routing domain. | |
1746 | * Just send an LSAck message to cease retransmission. | |
1747 | */ | |
1748 | if (IS_LSA_MAXAGE (lsa)) | |
1749 | { | |
1750 | zlog_warn ("LSA[%s]: Boomerang effect?", dump_lsa_key (lsa)); | |
1751 | ospf_ls_ack_send (nbr, lsa); | |
1752 | ospf_lsa_discard (lsa); | |
1753 | ||
1754 | if (current != NULL && ! IS_LSA_MAXAGE (current)) | |
1755 | ospf_opaque_lsa_refresh_schedule (current); | |
1756 | continue; | |
1757 | } | |
1758 | ||
1759 | /* | |
1760 | * If an instance of self-originated Opaque-LSA is not found | |
1761 | * in the LSDB, there are some possible cases here. | |
1762 | * | |
1763 | * 1) This node lost opaque-capability after restart. | |
1764 | * 2) Else, a part of opaque-type is no more supported. | |
1765 | * 3) Else, a part of opaque-id is no more supported. | |
1766 | * | |
1767 | * Anyway, it is still this node's responsibility to flush it. | |
1768 | * Otherwise, the LSA instance remains in the routing domain | |
1769 | * until its age reaches to MaxAge. | |
1770 | */ | |
1771 | if (current == NULL) | |
1772 | { | |
1773 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1774 | zlog_debug ("LSA[%s]: Previously originated Opaque-LSA, not found in the LSDB.", dump_lsa_key (lsa)); |
718e3744 | 1775 | |
1776 | SET_FLAG (lsa->flags, OSPF_LSA_SELF); | |
1777 | listnode_add (mylsa_upds, ospf_lsa_dup (lsa)); | |
1778 | listnode_add (mylsa_acks, ospf_lsa_lock (lsa)); | |
1779 | continue; | |
1780 | } | |
1781 | } | |
1782 | #endif /* HAVE_OPAQUE_LSA */ | |
cb05eb28 | 1783 | /* It might be happen that received LSA is self-originated network LSA, but |
1784 | * router ID is cahnged. So, we should check if LSA is a network-LSA whose | |
1785 | * Link State ID is one of the router's own IP interface addresses but whose | |
1786 | * Advertising Router is not equal to the router's own Router ID | |
1787 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be flushed. | |
1788 | */ | |
1789 | ||
1790 | if(lsa->data->type == OSPF_NETWORK_LSA) | |
1791 | { | |
1eb8ef25 | 1792 | struct listnode *oinode, *oinnode; |
1793 | struct ospf_interface *out_if; | |
cb05eb28 | 1794 | int Flag = 0; |
1795 | ||
1eb8ef25 | 1796 | for (ALL_LIST_ELEMENTS (oi->ospf->oiflist, oinode, oinnode, out_if)) |
cb05eb28 | 1797 | { |
cb05eb28 | 1798 | if(out_if == NULL) |
1799 | break; | |
1800 | ||
1801 | if((IPV4_ADDR_SAME(&out_if->address->u.prefix4, &lsa->data->id)) && | |
1802 | (!(IPV4_ADDR_SAME(&oi->ospf->router_id, &lsa->data->adv_router)))) | |
1803 | { | |
1804 | if(out_if->network_lsa_self) | |
1805 | { | |
1806 | ospf_lsa_flush_area(lsa,out_if->area); | |
1807 | if(IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1808 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", |
cb05eb28 | 1809 | lsa, (int) lsa->data->type); |
1810 | ospf_lsa_discard (lsa); | |
1811 | Flag = 1; | |
1812 | } | |
1813 | break; | |
1814 | } | |
1815 | } | |
1816 | if(Flag) | |
1817 | continue; | |
1818 | } | |
718e3744 | 1819 | |
1820 | /* (5) Find the instance of this LSA that is currently contained | |
1821 | in the router's link state database. If there is no | |
1822 | database copy, or the received LSA is more recent than | |
1823 | the database copy the following steps must be performed. */ | |
1824 | ||
1825 | if (current == NULL || | |
1826 | (ret = ospf_lsa_more_recent (current, lsa)) < 0) | |
1827 | { | |
1828 | /* Actual flooding procedure. */ | |
68980084 | 1829 | if (ospf_flood (oi->ospf, nbr, current, lsa) < 0) /* Trap NSSA later. */ |
718e3744 | 1830 | DISCARD_LSA (lsa, 4); |
1831 | continue; | |
1832 | } | |
1833 | ||
1834 | /* (6) Else, If there is an instance of the LSA on the sending | |
1835 | neighbor's Link state request list, an error has occurred in | |
1836 | the Database Exchange process. In this case, restart the | |
1837 | Database Exchange process by generating the neighbor event | |
1838 | BadLSReq for the sending neighbor and stop processing the | |
1839 | Link State Update packet. */ | |
1840 | ||
1841 | if (ospf_ls_request_lookup (nbr, lsa)) | |
1842 | { | |
1843 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
3aa8d5f9 | 1844 | zlog_warn("LSA[%s] instance exists on Link state request list", |
1845 | dump_lsa_key(lsa)); | |
718e3744 | 1846 | |
1847 | /* Clean list of LSAs. */ | |
1848 | ospf_upd_list_clean (lsas); | |
1849 | /* this lsa is not on lsas list already. */ | |
1850 | ospf_lsa_discard (lsa); | |
1851 | #ifdef HAVE_OPAQUE_LSA | |
1852 | list_delete (mylsa_acks); | |
1853 | list_delete (mylsa_upds); | |
1854 | #endif /* HAVE_OPAQUE_LSA */ | |
1855 | return; | |
1856 | } | |
1857 | ||
1858 | /* If the received LSA is the same instance as the database copy | |
1859 | (i.e., neither one is more recent) the following two steps | |
1860 | should be performed: */ | |
1861 | ||
1862 | if (ret == 0) | |
1863 | { | |
1864 | /* If the LSA is listed in the Link state retransmission list | |
1865 | for the receiving adjacency, the router itself is expecting | |
1866 | an acknowledgment for this LSA. The router should treat the | |
1867 | received LSA as an acknowledgment by removing the LSA from | |
1868 | the Link state retransmission list. This is termed an | |
1869 | "implied acknowledgment". */ | |
1870 | ||
1871 | ls_ret = ospf_ls_retransmit_lookup (nbr, lsa); | |
1872 | ||
1873 | if (ls_ret != NULL) | |
1874 | { | |
1875 | ospf_ls_retransmit_delete (nbr, ls_ret); | |
1876 | ||
1877 | /* Delayed acknowledgment sent if advertisement received | |
1878 | from Designated Router, otherwise do nothing. */ | |
1879 | if (oi->state == ISM_Backup) | |
1880 | if (NBR_IS_DR (nbr)) | |
1881 | listnode_add (oi->ls_ack, ospf_lsa_lock (lsa)); | |
1882 | ||
1883 | DISCARD_LSA (lsa, 5); | |
1884 | } | |
1885 | else | |
1886 | /* Acknowledge the receipt of the LSA by sending a | |
1887 | Link State Acknowledgment packet back out the receiving | |
1888 | interface. */ | |
1889 | { | |
1890 | ospf_ls_ack_send (nbr, lsa); | |
1891 | DISCARD_LSA (lsa, 6); | |
1892 | } | |
1893 | } | |
1894 | ||
1895 | /* The database copy is more recent. If the database copy | |
1896 | has LS age equal to MaxAge and LS sequence number equal to | |
1897 | MaxSequenceNumber, simply discard the received LSA without | |
1898 | acknowledging it. (In this case, the LSA's LS sequence number is | |
1899 | wrapping, and the MaxSequenceNumber LSA must be completely | |
1900 | flushed before any new LSA instance can be introduced). */ | |
1901 | ||
1902 | else if (ret > 0) /* Database copy is more recent */ | |
1903 | { | |
1904 | if (IS_LSA_MAXAGE (current) && | |
1905 | current->data->ls_seqnum == htonl (OSPF_MAX_SEQUENCE_NUMBER)) | |
1906 | { | |
1907 | DISCARD_LSA (lsa, 7); | |
1908 | } | |
1909 | /* Otherwise, as long as the database copy has not been sent in a | |
1910 | Link State Update within the last MinLSArrival seconds, send the | |
1911 | database copy back to the sending neighbor, encapsulated within | |
1912 | a Link State Update Packet. The Link State Update Packet should | |
1913 | be sent directly to the neighbor. In so doing, do not put the | |
1914 | database copy of the LSA on the neighbor's link state | |
1915 | retransmission list, and do not acknowledge the received (less | |
1916 | recent) LSA instance. */ | |
1917 | else | |
1918 | { | |
1919 | struct timeval now; | |
1920 | ||
1921 | gettimeofday (&now, NULL); | |
1922 | ||
1923 | if (tv_cmp (tv_sub (now, current->tv_orig), | |
1924 | int2tv (OSPF_MIN_LS_ARRIVAL)) > 0) | |
1925 | /* Trap NSSA type later.*/ | |
1926 | ospf_ls_upd_send_lsa (nbr, current, OSPF_SEND_PACKET_DIRECT); | |
1927 | DISCARD_LSA (lsa, 8); | |
1928 | } | |
1929 | } | |
1930 | } | |
1931 | ||
1932 | #ifdef HAVE_OPAQUE_LSA | |
1933 | /* | |
1934 | * Now that previously originated Opaque-LSAs those which not yet | |
1935 | * installed into LSDB are captured, take several steps to clear | |
1936 | * them completely from the routing domain, before proceeding to | |
1937 | * origination for the current target Opaque-LSAs. | |
1938 | */ | |
1939 | while (listcount (mylsa_acks) > 0) | |
1940 | ospf_ls_ack_send_list (oi, mylsa_acks, nbr->address.u.prefix4); | |
1941 | ||
1942 | if (listcount (mylsa_upds) > 0) | |
1943 | ospf_opaque_self_originated_lsa_received (nbr, mylsa_upds); | |
1944 | ||
1945 | list_delete (mylsa_upds); | |
683b2265 | 1946 | list_delete (mylsa_acks); |
718e3744 | 1947 | #endif /* HAVE_OPAQUE_LSA */ |
1948 | ||
1949 | assert (listcount (lsas) == 0); | |
1950 | list_delete (lsas); | |
1951 | } | |
1952 | ||
1953 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
4dadc291 | 1954 | static void |
718e3744 | 1955 | ospf_ls_ack (struct ip *iph, struct ospf_header *ospfh, |
1956 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1957 | { | |
1958 | struct ospf_neighbor *nbr; | |
1959 | #ifdef HAVE_OPAQUE_LSA | |
87d6f87a | 1960 | struct list *opaque_acks; |
718e3744 | 1961 | #endif /* HAVE_OPAQUE_LSA */ |
1962 | ||
1963 | /* increment statistics. */ | |
1964 | oi->ls_ack_in++; | |
1965 | ||
d3f0d621 | 1966 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1967 | if (nbr == NULL) |
1968 | { | |
1969 | zlog_warn ("Link State Acknowledgment: Unknown Neighbor %s.", | |
1970 | inet_ntoa (ospfh->router_id)); | |
1971 | return; | |
1972 | } | |
1973 | ||
1974 | if (nbr->state < NSM_Exchange) | |
1975 | { | |
3aa8d5f9 | 1976 | zlog_warn ("Link State Acknowledgment: " |
1977 | "Neighbor[%s] state %s is less than Exchange", | |
1978 | inet_ntoa (ospfh->router_id), | |
1979 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 1980 | return; |
1981 | } | |
1982 | ||
1983 | #ifdef HAVE_OPAQUE_LSA | |
1984 | opaque_acks = list_new (); | |
1985 | #endif /* HAVE_OPAQUE_LSA */ | |
1986 | ||
1987 | while (size >= OSPF_LSA_HEADER_SIZE) | |
1988 | { | |
1989 | struct ospf_lsa *lsa, *lsr; | |
1990 | ||
1991 | lsa = ospf_lsa_new (); | |
1992 | lsa->data = (struct lsa_header *) STREAM_PNT (s); | |
1993 | ||
1994 | /* lsah = (struct lsa_header *) STREAM_PNT (s); */ | |
1995 | size -= OSPF_LSA_HEADER_SIZE; | |
9985f83c | 1996 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 1997 | |
1998 | if (lsa->data->type < OSPF_MIN_LSA || lsa->data->type >= OSPF_MAX_LSA) | |
1999 | { | |
2000 | lsa->data = NULL; | |
2001 | ospf_lsa_discard (lsa); | |
2002 | continue; | |
2003 | } | |
2004 | ||
2005 | lsr = ospf_ls_retransmit_lookup (nbr, lsa); | |
2006 | ||
2007 | if (lsr != NULL && lsr->data->ls_seqnum == lsa->data->ls_seqnum) | |
2008 | { | |
2009 | #ifdef HAVE_OPAQUE_LSA | |
2010 | /* Keep this LSA entry for later reference. */ | |
2011 | if (IS_OPAQUE_LSA (lsr->data->type)) | |
2012 | listnode_add (opaque_acks, ospf_lsa_dup (lsr)); | |
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 | ||
2022 | #ifdef HAVE_OPAQUE_LSA | |
2023 | if (listcount (opaque_acks) > 0) | |
2024 | ospf_opaque_ls_ack_received (nbr, opaque_acks); | |
2025 | ||
2026 | list_delete (opaque_acks); | |
2027 | return; | |
2028 | #endif /* HAVE_OPAQUE_LSA */ | |
2029 | } | |
2030 | \f | |
038163fa | 2031 | static struct stream * |
5c33349b | 2032 | ospf_recv_packet (int fd, struct interface **ifp, struct stream *ibuf) |
718e3744 | 2033 | { |
2034 | int ret; | |
5c33349b | 2035 | struct ip *iph; |
718e3744 | 2036 | u_int16_t ip_len; |
718e3744 | 2037 | unsigned int ifindex = 0; |
2038 | struct iovec iov; | |
d0deca68 | 2039 | /* Header and data both require alignment. */ |
e304982e | 2040 | char buff [CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; |
2dd8bb4e | 2041 | struct msghdr msgh; |
2042 | ||
68defd6d | 2043 | memset (&msgh, 0, sizeof (struct msghdr)); |
2dd8bb4e | 2044 | msgh.msg_iov = &iov; |
2045 | msgh.msg_iovlen = 1; | |
2046 | msgh.msg_control = (caddr_t) buff; | |
2047 | msgh.msg_controllen = sizeof (buff); | |
2dd8bb4e | 2048 | |
5c33349b | 2049 | ret = stream_recvmsg (ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE+1); |
2050 | if (ret < 0) | |
718e3744 | 2051 | { |
5c33349b | 2052 | zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno)); |
2053 | return NULL; | |
2054 | } | |
2055 | if (ret < sizeof(iph)) | |
2056 | { | |
2057 | zlog_warn("ospf_recv_packet: discarding runt packet of length %d " | |
2058 | "(ip header size is %u)", | |
2059 | ret, (u_int)sizeof(iph)); | |
718e3744 | 2060 | return NULL; |
2061 | } | |
18b12c38 | 2062 | |
5c33349b | 2063 | /* Note that there should not be alignment problems with this assignment |
2064 | because this is at the beginning of the stream data buffer. */ | |
2065 | iph = (struct ip *) STREAM_DATA(ibuf); | |
2066 | sockopt_iphdrincl_swab_systoh (iph); | |
18b12c38 | 2067 | |
5c33349b | 2068 | ip_len = iph->ip_len; |
6b333611 | 2069 | |
239aecc0 | 2070 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) |
718e3744 | 2071 | /* |
2072 | * Kernel network code touches incoming IP header parameters, | |
2073 | * before protocol specific processing. | |
2074 | * | |
2075 | * 1) Convert byteorder to host representation. | |
2076 | * --> ip_len, ip_id, ip_off | |
2077 | * | |
2078 | * 2) Adjust ip_len to strip IP header size! | |
2079 | * --> If user process receives entire IP packet via RAW | |
2080 | * socket, it must consider adding IP header size to | |
2081 | * the "ip_len" field of "ip" structure. | |
2082 | * | |
2083 | * For more details, see <netinet/ip_input.c>. | |
2084 | */ | |
5c33349b | 2085 | ip_len = ip_len + (iph->ip_hl << 2); |
718e3744 | 2086 | #endif |
2087 | ||
863082d5 | 2088 | ifindex = getsockopt_ifindex (AF_INET, &msgh); |
718e3744 | 2089 | |
2090 | *ifp = if_lookup_by_index (ifindex); | |
2091 | ||
2092 | if (ret != ip_len) | |
2093 | { | |
5c33349b | 2094 | zlog_warn ("ospf_recv_packet read length mismatch: ip_len is %d, " |
2095 | "but recvmsg returned %d", ip_len, ret); | |
718e3744 | 2096 | return NULL; |
2097 | } | |
2098 | ||
2099 | return ibuf; | |
2100 | } | |
2101 | ||
4dadc291 | 2102 | static struct ospf_interface * |
d3f0d621 | 2103 | ospf_associate_packet_vl (struct ospf *ospf, struct interface *ifp, |
718e3744 | 2104 | struct ip *iph, struct ospf_header *ospfh) |
2105 | { | |
2106 | struct ospf_interface *rcv_oi; | |
718e3744 | 2107 | struct ospf_vl_data *vl_data; |
2108 | struct ospf_area *vl_area; | |
52dc7ee6 | 2109 | struct listnode *node; |
718e3744 | 2110 | |
2111 | if (IN_MULTICAST (ntohl (iph->ip_dst.s_addr)) || | |
2112 | !OSPF_IS_AREA_BACKBONE (ospfh)) | |
d3f0d621 | 2113 | return NULL; |
718e3744 | 2114 | |
d3f0d621 | 2115 | /* look for local OSPF interface matching the destination |
2116 | * to determine Area ID. We presume therefore the destination address | |
2117 | * is unique, or at least (for "unnumbered" links), not used in other | |
2118 | * areas | |
2119 | */ | |
2120 | if ((rcv_oi = ospf_if_lookup_by_local_addr (ospf, NULL, | |
2121 | iph->ip_dst)) == NULL) | |
2122 | return NULL; | |
718e3744 | 2123 | |
1eb8ef25 | 2124 | for (ALL_LIST_ELEMENTS_RO (ospf->vlinks, node, vl_data)) |
718e3744 | 2125 | { |
020709f9 | 2126 | vl_area = ospf_area_lookup_by_area_id (ospf, vl_data->vl_area_id); |
718e3744 | 2127 | if (!vl_area) |
2128 | continue; | |
2129 | ||
2130 | if (OSPF_AREA_SAME (&vl_area, &rcv_oi->area) && | |
2131 | IPV4_ADDR_SAME (&vl_data->vl_peer, &ospfh->router_id)) | |
2132 | { | |
2133 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2134 | zlog_debug ("associating packet with %s", |
718e3744 | 2135 | IF_NAME (vl_data->vl_oi)); |
2136 | if (! CHECK_FLAG (vl_data->vl_oi->ifp->flags, IFF_UP)) | |
2137 | { | |
2138 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2139 | zlog_debug ("This VL is not up yet, sorry"); |
718e3744 | 2140 | return NULL; |
2141 | } | |
2142 | ||
2143 | return vl_data->vl_oi; | |
2144 | } | |
2145 | } | |
2146 | ||
2147 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2148 | zlog_debug ("couldn't find any VL to associate the packet with"); |
718e3744 | 2149 | |
d3f0d621 | 2150 | return NULL; |
718e3744 | 2151 | } |
2152 | ||
4dadc291 | 2153 | static inline int |
718e3744 | 2154 | ospf_check_area_id (struct ospf_interface *oi, struct ospf_header *ospfh) |
2155 | { | |
2156 | /* Check match the Area ID of the receiving interface. */ | |
2157 | if (OSPF_AREA_SAME (&oi->area, &ospfh)) | |
2158 | return 1; | |
2159 | ||
2160 | return 0; | |
2161 | } | |
2162 | ||
2163 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2164 | To prevent it, compare src IP address and i/f address with masking | |
2165 | i/f network mask. */ | |
4dadc291 | 2166 | static int |
718e3744 | 2167 | ospf_check_network_mask (struct ospf_interface *oi, struct in_addr ip_src) |
2168 | { | |
2169 | struct in_addr mask, me, him; | |
2170 | ||
2171 | if (oi->type == OSPF_IFTYPE_POINTOPOINT || | |
2172 | oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2173 | return 1; | |
2174 | ||
2175 | masklen2ip (oi->address->prefixlen, &mask); | |
2176 | ||
2177 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
2178 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
2179 | ||
2180 | if (IPV4_ADDR_SAME (&me, &him)) | |
2181 | return 1; | |
2182 | ||
2183 | return 0; | |
2184 | } | |
2185 | ||
4dadc291 | 2186 | static int |
718e3744 | 2187 | ospf_check_auth (struct ospf_interface *oi, struct stream *ibuf, |
2188 | struct ospf_header *ospfh) | |
2189 | { | |
2190 | int ret = 0; | |
2191 | struct crypt_key *ck; | |
2192 | ||
2193 | switch (ntohs (ospfh->auth_type)) | |
2194 | { | |
2195 | case OSPF_AUTH_NULL: | |
2196 | ret = 1; | |
2197 | break; | |
2198 | case OSPF_AUTH_SIMPLE: | |
2199 | if (!memcmp (OSPF_IF_PARAM (oi, auth_simple), ospfh->u.auth_data, OSPF_AUTH_SIMPLE_SIZE)) | |
2200 | ret = 1; | |
2201 | else | |
2202 | ret = 0; | |
2203 | break; | |
2204 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
1eb8ef25 | 2205 | if ((ck = listgetdata (listtail(OSPF_IF_PARAM (oi,auth_crypt)))) == NULL) |
718e3744 | 2206 | { |
2207 | ret = 0; | |
2208 | break; | |
2209 | } | |
2210 | ||
2211 | /* This is very basic, the digest processing is elsewhere */ | |
2212 | if (ospfh->u.crypt.auth_data_len == OSPF_AUTH_MD5_SIZE && | |
2213 | ospfh->u.crypt.key_id == ck->key_id && | |
2214 | ntohs (ospfh->length) + OSPF_AUTH_SIMPLE_SIZE <= stream_get_size (ibuf)) | |
2215 | ret = 1; | |
2216 | else | |
2217 | ret = 0; | |
2218 | break; | |
2219 | default: | |
2220 | ret = 0; | |
2221 | break; | |
2222 | } | |
2223 | ||
2224 | return ret; | |
2225 | } | |
2226 | ||
4dadc291 | 2227 | static int |
718e3744 | 2228 | ospf_check_sum (struct ospf_header *ospfh) |
2229 | { | |
2230 | u_int32_t ret; | |
2231 | u_int16_t sum; | |
2232 | int in_cksum (void *ptr, int nbytes); | |
2233 | ||
2234 | /* clear auth_data for checksum. */ | |
2235 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2236 | ||
2237 | /* keep checksum and clear. */ | |
2238 | sum = ospfh->checksum; | |
2239 | memset (&ospfh->checksum, 0, sizeof (u_int16_t)); | |
2240 | ||
2241 | /* calculate checksum. */ | |
2242 | ret = in_cksum (ospfh, ntohs (ospfh->length)); | |
2243 | ||
2244 | if (ret != sum) | |
2245 | { | |
2246 | zlog_info ("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2247 | ret, sum); | |
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | return 1; | |
2252 | } | |
2253 | ||
2254 | /* OSPF Header verification. */ | |
4dadc291 | 2255 | static int |
718e3744 | 2256 | ospf_verify_header (struct stream *ibuf, struct ospf_interface *oi, |
2257 | struct ip *iph, struct ospf_header *ospfh) | |
2258 | { | |
2259 | /* check version. */ | |
2260 | if (ospfh->version != OSPF_VERSION) | |
2261 | { | |
2262 | zlog_warn ("interface %s: ospf_read version number mismatch.", | |
2263 | IF_NAME (oi)); | |
2264 | return -1; | |
2265 | } | |
2266 | ||
2267 | /* Check Area ID. */ | |
2268 | if (!ospf_check_area_id (oi, ospfh)) | |
2269 | { | |
2270 | zlog_warn ("interface %s: ospf_read invalid Area ID %s.", | |
2271 | IF_NAME (oi), inet_ntoa (ospfh->area_id)); | |
2272 | return -1; | |
2273 | } | |
2274 | ||
2275 | /* Check network mask, Silently discarded. */ | |
2276 | if (! ospf_check_network_mask (oi, iph->ip_src)) | |
2277 | { | |
2278 | zlog_warn ("interface %s: ospf_read network address is not same [%s]", | |
2279 | IF_NAME (oi), inet_ntoa (iph->ip_src)); | |
2280 | return -1; | |
2281 | } | |
2282 | ||
2283 | /* Check authentication. */ | |
2284 | if (ospf_auth_type (oi) != ntohs (ospfh->auth_type)) | |
2285 | { | |
2286 | zlog_warn ("interface %s: ospf_read authentication type mismatch.", | |
2287 | IF_NAME (oi)); | |
2288 | return -1; | |
2289 | } | |
2290 | ||
2291 | if (! ospf_check_auth (oi, ibuf, ospfh)) | |
2292 | { | |
2293 | zlog_warn ("interface %s: ospf_read authentication failed.", | |
2294 | IF_NAME (oi)); | |
2295 | return -1; | |
2296 | } | |
2297 | ||
2298 | /* if check sum is invalid, packet is discarded. */ | |
2299 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2300 | { | |
2301 | if (! ospf_check_sum (ospfh)) | |
2302 | { | |
2303 | zlog_warn ("interface %s: ospf_read packet checksum error %s", | |
2304 | IF_NAME (oi), inet_ntoa (ospfh->router_id)); | |
2305 | return -1; | |
2306 | } | |
2307 | } | |
2308 | else | |
2309 | { | |
2310 | if (ospfh->checksum != 0) | |
2311 | return -1; | |
2312 | if (ospf_check_md5_digest (oi, ibuf, ntohs (ospfh->length)) == 0) | |
2313 | { | |
2314 | zlog_warn ("interface %s: ospf_read md5 authentication failed.", | |
2315 | IF_NAME (oi)); | |
2316 | return -1; | |
2317 | } | |
2318 | } | |
2319 | ||
2320 | return 0; | |
2321 | } | |
2322 | ||
2323 | /* Starting point of packet process function. */ | |
2324 | int | |
2325 | ospf_read (struct thread *thread) | |
2326 | { | |
2327 | int ret; | |
2328 | struct stream *ibuf; | |
68980084 | 2329 | struct ospf *ospf; |
718e3744 | 2330 | struct ospf_interface *oi; |
2331 | struct ip *iph; | |
2332 | struct ospf_header *ospfh; | |
2333 | u_int16_t length; | |
2334 | struct interface *ifp; | |
2335 | ||
2336 | /* first of all get interface pointer. */ | |
68980084 | 2337 | ospf = THREAD_ARG (thread); |
038163fa | 2338 | |
2339 | /* prepare for next packet. */ | |
2340 | ospf->t_read = thread_add_read (master, ospf_read, ospf, ospf->fd); | |
718e3744 | 2341 | |
2342 | /* read OSPF packet. */ | |
5c33349b | 2343 | stream_reset(ospf->ibuf); |
2344 | if (!(ibuf = ospf_recv_packet (ospf->fd, &ifp, ospf->ibuf))) | |
718e3744 | 2345 | return -1; |
2346 | ||
5c33349b | 2347 | /* Note that there should not be alignment problems with this assignment |
2348 | because this is at the beginning of the stream data buffer. */ | |
06f953f7 | 2349 | iph = (struct ip *) STREAM_DATA (ibuf); |
5c33349b | 2350 | /* Note that sockopt_iphdrincl_swab_systoh was called in ospf_recv_packet. */ |
06f953f7 | 2351 | |
ac191232 | 2352 | if (ifp == NULL) |
b87f772a | 2353 | /* Handle cases where the platform does not support retrieving the ifindex, |
2354 | and also platforms (such as Solaris 8) that claim to support ifindex | |
2355 | retrieval but do not. */ | |
ac191232 | 2356 | ifp = if_lookup_address (iph->ip_src); |
ac191232 | 2357 | |
d3f0d621 | 2358 | if (ifp == NULL) |
5c33349b | 2359 | return 0; |
718e3744 | 2360 | |
2361 | /* IP Header dump. */ | |
17b78d38 | 2362 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) |
6b333611 | 2363 | ospf_ip_header_dump (iph); |
7d95c611 | 2364 | |
718e3744 | 2365 | /* Self-originated packet should be discarded silently. */ |
68980084 | 2366 | if (ospf_if_lookup_by_local_addr (ospf, NULL, iph->ip_src)) |
718e3744 | 2367 | { |
d324181c | 2368 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) |
2369 | { | |
2a42e285 | 2370 | zlog_debug ("ospf_read[%s]: Dropping self-originated packet", |
d324181c | 2371 | inet_ntoa (iph->ip_src)); |
2372 | } | |
718e3744 | 2373 | return 0; |
2374 | } | |
2375 | ||
2376 | /* Adjust size to message length. */ | |
9985f83c | 2377 | stream_forward_getp (ibuf, iph->ip_hl * 4); |
718e3744 | 2378 | |
2379 | /* Get ospf packet header. */ | |
2380 | ospfh = (struct ospf_header *) STREAM_PNT (ibuf); | |
2381 | ||
2382 | /* associate packet with ospf interface */ | |
68980084 | 2383 | oi = ospf_if_lookup_recv_if (ospf, iph->ip_src); |
d3f0d621 | 2384 | |
2385 | /* if no local ospf_interface, | |
2386 | * or header area is backbone but ospf_interface is not | |
2387 | * check for VLINK interface | |
2388 | */ | |
2389 | if ( (oi == NULL) || | |
2390 | (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) | |
2391 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id)) | |
2392 | ) | |
718e3744 | 2393 | { |
d3f0d621 | 2394 | if ((oi = ospf_associate_packet_vl (ospf, ifp, iph, ospfh)) == NULL) |
d324181c | 2395 | { |
d3f0d621 | 2396 | zlog_warn ("Packet from [%s] received on link %s" |
2397 | " but no ospf_interface", | |
2398 | inet_ntoa (iph->ip_src), ifp->name); | |
d3f0d621 | 2399 | return 0; |
d324181c | 2400 | } |
d3f0d621 | 2401 | } |
2402 | ||
2403 | /* else it must be a local ospf interface, check it was received on | |
2404 | * correct link | |
2405 | */ | |
2406 | else if (oi->ifp != ifp) | |
2407 | { | |
2408 | zlog_warn ("Packet from [%s] received on wrong link %s", | |
2409 | inet_ntoa (iph->ip_src), ifp->name); | |
718e3744 | 2410 | return 0; |
2411 | } | |
847947f2 | 2412 | else if (oi->state == ISM_Down) |
c3eab871 | 2413 | { |
ba6454ec | 2414 | char buf[2][INET_ADDRSTRLEN]; |
2415 | zlog_warn ("Ignoring packet from %s to %s received on interface that is " | |
847947f2 | 2416 | "down [%s]; interface flags are %s", |
ba6454ec | 2417 | inet_ntop(AF_INET, &iph->ip_src, buf[0], sizeof(buf[0])), |
2418 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2419 | ifp->name, if_flag_dump(ifp->flags)); | |
ba6454ec | 2420 | /* Fix multicast memberships? */ |
2421 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
2422 | SET_FLAG(oi->multicast_memberships, MEMBER_ALLROUTERS); | |
2423 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) | |
2424 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
2425 | if (oi->multicast_memberships) | |
2426 | ospf_if_set_multicast(oi); | |
c3eab871 | 2427 | return 0; |
2428 | } | |
718e3744 | 2429 | |
2430 | /* | |
2431 | * If the received packet is destined for AllDRouters, the packet | |
2432 | * should be accepted only if the received ospf interface state is | |
2433 | * either DR or Backup -- endo. | |
2434 | */ | |
2435 | if (iph->ip_dst.s_addr == htonl (OSPF_ALLDROUTERS) | |
2436 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) | |
2437 | { | |
ba6454ec | 2438 | zlog_warn ("Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", |
718e3744 | 2439 | inet_ntoa (iph->ip_src), IF_NAME (oi), |
2440 | LOOKUP (ospf_ism_state_msg, oi->state)); | |
ba6454ec | 2441 | /* Try to fix multicast membership. */ |
2442 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
2443 | ospf_if_set_multicast(oi); | |
718e3744 | 2444 | return 0; |
2445 | } | |
2446 | ||
2447 | /* Show debug receiving packet. */ | |
1aa7b399 | 2448 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2449 | { | |
718e3744 | 2450 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) |
1aa7b399 | 2451 | { |
2a42e285 | 2452 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2453 | ospf_packet_dump (ibuf); |
2454 | } | |
718e3744 | 2455 | |
2a42e285 | 2456 | zlog_debug ("%s received from [%s] via [%s]", |
1aa7b399 | 2457 | ospf_packet_type_str[ospfh->type], |
2458 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); | |
2a42e285 | 2459 | zlog_debug (" src [%s],", inet_ntoa (iph->ip_src)); |
2460 | zlog_debug (" dst [%s]", inet_ntoa (iph->ip_dst)); | |
718e3744 | 2461 | |
2462 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) | |
2a42e285 | 2463 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2464 | } |
718e3744 | 2465 | |
2466 | /* Some header verification. */ | |
2467 | ret = ospf_verify_header (ibuf, oi, iph, ospfh); | |
2468 | if (ret < 0) | |
2469 | { | |
d324181c | 2470 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2471 | { | |
2a42e285 | 2472 | zlog_debug ("ospf_read[%s/%s]: Header check failed, " |
d324181c | 2473 | "dropping.", |
2474 | ospf_packet_type_str[ospfh->type], | |
2475 | inet_ntoa (iph->ip_src)); | |
2476 | } | |
718e3744 | 2477 | return ret; |
2478 | } | |
2479 | ||
9985f83c | 2480 | stream_forward_getp (ibuf, OSPF_HEADER_SIZE); |
718e3744 | 2481 | |
2482 | /* Adjust size to message length. */ | |
2483 | length = ntohs (ospfh->length) - OSPF_HEADER_SIZE; | |
2484 | ||
2485 | /* Read rest of the packet and call each sort of packet routine. */ | |
2486 | switch (ospfh->type) | |
2487 | { | |
2488 | case OSPF_MSG_HELLO: | |
2489 | ospf_hello (iph, ospfh, ibuf, oi, length); | |
2490 | break; | |
2491 | case OSPF_MSG_DB_DESC: | |
2492 | ospf_db_desc (iph, ospfh, ibuf, oi, length); | |
2493 | break; | |
2494 | case OSPF_MSG_LS_REQ: | |
2495 | ospf_ls_req (iph, ospfh, ibuf, oi, length); | |
2496 | break; | |
2497 | case OSPF_MSG_LS_UPD: | |
2498 | ospf_ls_upd (iph, ospfh, ibuf, oi, length); | |
2499 | break; | |
2500 | case OSPF_MSG_LS_ACK: | |
2501 | ospf_ls_ack (iph, ospfh, ibuf, oi, length); | |
2502 | break; | |
2503 | default: | |
2504 | zlog (NULL, LOG_WARNING, | |
2505 | "interface %s: OSPF packet header type %d is illegal", | |
2506 | IF_NAME (oi), ospfh->type); | |
2507 | break; | |
2508 | } | |
2509 | ||
718e3744 | 2510 | return 0; |
2511 | } | |
2512 | ||
2513 | /* Make OSPF header. */ | |
4dadc291 | 2514 | static void |
718e3744 | 2515 | ospf_make_header (int type, struct ospf_interface *oi, struct stream *s) |
2516 | { | |
2517 | struct ospf_header *ospfh; | |
2518 | ||
2519 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
2520 | ||
2521 | ospfh->version = (u_char) OSPF_VERSION; | |
2522 | ospfh->type = (u_char) type; | |
2523 | ||
68980084 | 2524 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 2525 | |
2526 | ospfh->checksum = 0; | |
2527 | ospfh->area_id = oi->area->area_id; | |
2528 | ospfh->auth_type = htons (ospf_auth_type (oi)); | |
2529 | ||
2530 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2531 | ||
9985f83c | 2532 | stream_forward_endp (s, OSPF_HEADER_SIZE); |
718e3744 | 2533 | } |
2534 | ||
2535 | /* Make Authentication Data. */ | |
4dadc291 | 2536 | static int |
718e3744 | 2537 | ospf_make_auth (struct ospf_interface *oi, struct ospf_header *ospfh) |
2538 | { | |
2539 | struct crypt_key *ck; | |
2540 | ||
2541 | switch (ospf_auth_type (oi)) | |
2542 | { | |
2543 | case OSPF_AUTH_NULL: | |
2544 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
2545 | break; | |
2546 | case OSPF_AUTH_SIMPLE: | |
2547 | memcpy (ospfh->u.auth_data, OSPF_IF_PARAM (oi, auth_simple), | |
2548 | OSPF_AUTH_SIMPLE_SIZE); | |
2549 | break; | |
2550 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
2551 | /* If key is not set, then set 0. */ | |
2552 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
2553 | { | |
2554 | ospfh->u.crypt.zero = 0; | |
2555 | ospfh->u.crypt.key_id = 0; | |
2556 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
2557 | } | |
2558 | else | |
2559 | { | |
1eb8ef25 | 2560 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
718e3744 | 2561 | ospfh->u.crypt.zero = 0; |
2562 | ospfh->u.crypt.key_id = ck->key_id; | |
2563 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
2564 | } | |
2565 | /* note: the seq is done in ospf_make_md5_digest() */ | |
2566 | break; | |
2567 | default: | |
2568 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
2569 | break; | |
2570 | } | |
2571 | ||
2572 | return 0; | |
2573 | } | |
2574 | ||
2575 | /* Fill rest of OSPF header. */ | |
4dadc291 | 2576 | static void |
718e3744 | 2577 | ospf_fill_header (struct ospf_interface *oi, |
2578 | struct stream *s, u_int16_t length) | |
2579 | { | |
2580 | struct ospf_header *ospfh; | |
2581 | ||
2582 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
2583 | ||
2584 | /* Fill length. */ | |
2585 | ospfh->length = htons (length); | |
2586 | ||
2587 | /* Calculate checksum. */ | |
2588 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2589 | ospfh->checksum = in_cksum (ospfh, length); | |
2590 | else | |
2591 | ospfh->checksum = 0; | |
2592 | ||
2593 | /* Add Authentication Data. */ | |
2594 | ospf_make_auth (oi, ospfh); | |
2595 | } | |
2596 | ||
4dadc291 | 2597 | static int |
718e3744 | 2598 | ospf_make_hello (struct ospf_interface *oi, struct stream *s) |
2599 | { | |
2600 | struct ospf_neighbor *nbr; | |
2601 | struct route_node *rn; | |
2602 | u_int16_t length = OSPF_HELLO_MIN_SIZE; | |
2603 | struct in_addr mask; | |
2604 | unsigned long p; | |
2605 | int flag = 0; | |
2606 | ||
2607 | /* Set netmask of interface. */ | |
2608 | if (oi->type != OSPF_IFTYPE_POINTOPOINT && | |
2609 | oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
2610 | masklen2ip (oi->address->prefixlen, &mask); | |
2611 | else | |
2612 | memset ((char *) &mask, 0, sizeof (struct in_addr)); | |
2613 | stream_put_ipv4 (s, mask.s_addr); | |
2614 | ||
2615 | /* Set Hello Interval. */ | |
2616 | stream_putw (s, OSPF_IF_PARAM (oi, v_hello)); | |
2617 | ||
2618 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2619 | zlog_debug ("make_hello: options: %x, int: %s", |
718e3744 | 2620 | OPTIONS(oi), IF_NAME (oi)); |
2621 | ||
2622 | /* Set Options. */ | |
2623 | stream_putc (s, OPTIONS (oi)); | |
2624 | ||
2625 | /* Set Router Priority. */ | |
2626 | stream_putc (s, PRIORITY (oi)); | |
2627 | ||
2628 | /* Set Router Dead Interval. */ | |
2629 | stream_putl (s, OSPF_IF_PARAM (oi, v_wait)); | |
2630 | ||
2631 | /* Set Designated Router. */ | |
2632 | stream_put_ipv4 (s, DR (oi).s_addr); | |
2633 | ||
9985f83c | 2634 | p = stream_get_endp (s); |
718e3744 | 2635 | |
2636 | /* Set Backup Designated Router. */ | |
2637 | stream_put_ipv4 (s, BDR (oi).s_addr); | |
2638 | ||
2639 | /* Add neighbor seen. */ | |
2640 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
68980084 | 2641 | if ((nbr = rn->info)) |
2642 | if (nbr->router_id.s_addr != 0) /* Ignore 0.0.0.0 node. */ | |
2643 | if (nbr->state != NSM_Attempt) /* Ignore Down neighbor. */ | |
2644 | if (nbr->state != NSM_Down) /* This is myself for DR election. */ | |
2645 | if (!IPV4_ADDR_SAME (&nbr->router_id, &oi->ospf->router_id)) | |
718e3744 | 2646 | { |
2647 | /* Check neighbor is sane? */ | |
68980084 | 2648 | if (nbr->d_router.s_addr != 0 |
2649 | && IPV4_ADDR_SAME (&nbr->d_router, &oi->address->u.prefix4) | |
2650 | && IPV4_ADDR_SAME (&nbr->bd_router, &oi->address->u.prefix4)) | |
2651 | flag = 1; | |
718e3744 | 2652 | |
2653 | stream_put_ipv4 (s, nbr->router_id.s_addr); | |
2654 | length += 4; | |
2655 | } | |
2656 | ||
2657 | /* Let neighbor generate BackupSeen. */ | |
2658 | if (flag == 1) | |
3a9eb091 | 2659 | stream_putl_at (s, p, 0); /* ipv4 address, normally */ |
718e3744 | 2660 | |
2661 | return length; | |
2662 | } | |
2663 | ||
4dadc291 | 2664 | static int |
718e3744 | 2665 | ospf_make_db_desc (struct ospf_interface *oi, struct ospf_neighbor *nbr, |
2666 | struct stream *s) | |
2667 | { | |
2668 | struct ospf_lsa *lsa; | |
2669 | u_int16_t length = OSPF_DB_DESC_MIN_SIZE; | |
2670 | u_char options; | |
2671 | unsigned long pp; | |
2672 | int i; | |
2673 | struct ospf_lsdb *lsdb; | |
2674 | ||
2675 | /* Set Interface MTU. */ | |
2676 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2677 | stream_putw (s, 0); | |
2678 | else | |
2679 | stream_putw (s, oi->ifp->mtu); | |
2680 | ||
2681 | /* Set Options. */ | |
2682 | options = OPTIONS (oi); | |
2683 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 2684 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 2685 | { |
2686 | if (IS_SET_DD_I (nbr->dd_flags) | |
2687 | || CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
2688 | /* | |
2689 | * Set O-bit in the outgoing DD packet for capablity negotiation, | |
2690 | * if one of following case is applicable. | |
2691 | * | |
2692 | * 1) WaitTimer expiration event triggered the neighbor state to | |
2693 | * change to Exstart, but no (valid) DD packet has received | |
2694 | * from the neighbor yet. | |
2695 | * | |
2696 | * 2) At least one DD packet with O-bit on has received from the | |
2697 | * neighbor. | |
2698 | */ | |
2699 | SET_FLAG (options, OSPF_OPTION_O); | |
2700 | } | |
2701 | #endif /* HAVE_OPAQUE_LSA */ | |
2702 | stream_putc (s, options); | |
2703 | ||
2704 | /* Keep pointer to flags. */ | |
9985f83c | 2705 | pp = stream_get_endp (s); |
718e3744 | 2706 | stream_putc (s, nbr->dd_flags); |
2707 | ||
2708 | /* Set DD Sequence Number. */ | |
2709 | stream_putl (s, nbr->dd_seqnum); | |
2710 | ||
2711 | if (ospf_db_summary_isempty (nbr)) | |
2712 | { | |
2713 | if (nbr->state >= NSM_Exchange) | |
2714 | { | |
2715 | nbr->dd_flags &= ~OSPF_DD_FLAG_M; | |
2716 | /* Set DD flags again */ | |
3a9eb091 | 2717 | stream_putc_at (s, pp, nbr->dd_flags); |
718e3744 | 2718 | } |
2719 | return length; | |
2720 | } | |
2721 | ||
2722 | /* Describe LSA Header from Database Summary List. */ | |
2723 | lsdb = &nbr->db_sum; | |
2724 | ||
2725 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
2726 | { | |
2727 | struct route_table *table = lsdb->type[i].db; | |
2728 | struct route_node *rn; | |
2729 | ||
2730 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
2731 | if ((lsa = rn->info) != NULL) | |
2732 | { | |
2733 | #ifdef HAVE_OPAQUE_LSA | |
2734 | if (IS_OPAQUE_LSA (lsa->data->type) | |
2735 | && (! CHECK_FLAG (options, OSPF_OPTION_O))) | |
2736 | { | |
2737 | /* Suppress advertising opaque-informations. */ | |
2738 | /* Remove LSA from DB summary list. */ | |
2739 | ospf_lsdb_delete (lsdb, lsa); | |
2740 | continue; | |
2741 | } | |
2742 | #endif /* HAVE_OPAQUE_LSA */ | |
2743 | ||
2744 | if (!CHECK_FLAG (lsa->flags, OSPF_LSA_DISCARD)) | |
2745 | { | |
2746 | struct lsa_header *lsah; | |
2747 | u_int16_t ls_age; | |
2748 | ||
2749 | /* DD packet overflows interface MTU. */ | |
86f1fd96 | 2750 | if (length + OSPF_LSA_HEADER_SIZE > ospf_packet_max (oi)) |
718e3744 | 2751 | break; |
2752 | ||
2753 | /* Keep pointer to LS age. */ | |
2754 | lsah = (struct lsa_header *) (STREAM_DATA (s) + | |
9985f83c | 2755 | stream_get_endp (s)); |
718e3744 | 2756 | |
2757 | /* Proceed stream pointer. */ | |
2758 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
2759 | length += OSPF_LSA_HEADER_SIZE; | |
2760 | ||
2761 | /* Set LS age. */ | |
2762 | ls_age = LS_AGE (lsa); | |
2763 | lsah->ls_age = htons (ls_age); | |
2764 | ||
2765 | } | |
2766 | ||
2767 | /* Remove LSA from DB summary list. */ | |
2768 | ospf_lsdb_delete (lsdb, lsa); | |
2769 | } | |
2770 | } | |
2771 | ||
2772 | return length; | |
2773 | } | |
2774 | ||
4dadc291 | 2775 | static int |
718e3744 | 2776 | ospf_make_ls_req_func (struct stream *s, u_int16_t *length, |
2777 | unsigned long delta, struct ospf_neighbor *nbr, | |
2778 | struct ospf_lsa *lsa) | |
2779 | { | |
2780 | struct ospf_interface *oi; | |
2781 | ||
2782 | oi = nbr->oi; | |
2783 | ||
2784 | /* LS Request packet overflows interface MTU. */ | |
86f1fd96 | 2785 | if (*length + delta > ospf_packet_max(oi)) |
718e3744 | 2786 | return 0; |
2787 | ||
2788 | stream_putl (s, lsa->data->type); | |
2789 | stream_put_ipv4 (s, lsa->data->id.s_addr); | |
2790 | stream_put_ipv4 (s, lsa->data->adv_router.s_addr); | |
2791 | ||
2792 | ospf_lsa_unlock (nbr->ls_req_last); | |
2793 | nbr->ls_req_last = ospf_lsa_lock (lsa); | |
2794 | ||
2795 | *length += 12; | |
2796 | return 1; | |
2797 | } | |
2798 | ||
4dadc291 | 2799 | static int |
718e3744 | 2800 | ospf_make_ls_req (struct ospf_neighbor *nbr, struct stream *s) |
2801 | { | |
2802 | struct ospf_lsa *lsa; | |
2803 | u_int16_t length = OSPF_LS_REQ_MIN_SIZE; | |
9985f83c | 2804 | unsigned long delta = stream_get_endp(s)+12; |
718e3744 | 2805 | struct route_table *table; |
2806 | struct route_node *rn; | |
2807 | int i; | |
2808 | struct ospf_lsdb *lsdb; | |
2809 | ||
2810 | lsdb = &nbr->ls_req; | |
2811 | ||
2812 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
2813 | { | |
2814 | table = lsdb->type[i].db; | |
2815 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
2816 | if ((lsa = (rn->info)) != NULL) | |
2817 | if (ospf_make_ls_req_func (s, &length, delta, nbr, lsa) == 0) | |
2818 | { | |
2819 | route_unlock_node (rn); | |
2820 | break; | |
2821 | } | |
2822 | } | |
2823 | return length; | |
2824 | } | |
2825 | ||
4dadc291 | 2826 | static int |
718e3744 | 2827 | ls_age_increment (struct ospf_lsa *lsa, int delay) |
2828 | { | |
2829 | int age; | |
2830 | ||
2831 | age = IS_LSA_MAXAGE (lsa) ? OSPF_LSA_MAXAGE : LS_AGE (lsa) + delay; | |
2832 | ||
2833 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); | |
2834 | } | |
2835 | ||
4dadc291 | 2836 | static int |
52dc7ee6 | 2837 | ospf_make_ls_upd (struct ospf_interface *oi, struct list *update, struct stream *s) |
718e3744 | 2838 | { |
2839 | struct ospf_lsa *lsa; | |
52dc7ee6 | 2840 | struct listnode *node; |
718e3744 | 2841 | u_int16_t length = OSPF_LS_UPD_MIN_SIZE; |
86f1fd96 | 2842 | unsigned int size_noauth; |
9985f83c | 2843 | unsigned long delta = stream_get_endp (s); |
718e3744 | 2844 | unsigned long pp; |
2845 | int count = 0; | |
2846 | ||
2847 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2848 | zlog_debug ("ospf_make_ls_upd: Start"); |
59ea14c6 | 2849 | |
9985f83c | 2850 | pp = stream_get_endp (s); |
2851 | stream_forward_endp (s, OSPF_LS_UPD_MIN_SIZE); | |
718e3744 | 2852 | |
86f1fd96 | 2853 | /* Calculate amount of packet usable for data. */ |
2854 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
2855 | ||
718e3744 | 2856 | while ((node = listhead (update)) != NULL) |
2857 | { | |
2858 | struct lsa_header *lsah; | |
2859 | u_int16_t ls_age; | |
2860 | ||
2861 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2862 | zlog_debug ("ospf_make_ls_upd: List Iteration"); |
718e3744 | 2863 | |
1eb8ef25 | 2864 | lsa = listgetdata (node); |
2865 | ||
718e3744 | 2866 | assert (lsa->data); |
2867 | ||
68b7339a | 2868 | /* Will it fit? */ |
86f1fd96 | 2869 | if (length + delta + ntohs (lsa->data->length) > size_noauth) |
59ea14c6 | 2870 | break; |
2871 | ||
718e3744 | 2872 | /* Keep pointer to LS age. */ |
9985f83c | 2873 | lsah = (struct lsa_header *) (STREAM_DATA (s) + stream_get_endp (s)); |
718e3744 | 2874 | |
2875 | /* Put LSA to Link State Request. */ | |
2876 | stream_put (s, lsa->data, ntohs (lsa->data->length)); | |
2877 | ||
2878 | /* Set LS age. */ | |
2879 | /* each hop must increment an lsa_age by transmit_delay | |
2880 | of OSPF interface */ | |
2881 | ls_age = ls_age_increment (lsa, OSPF_IF_PARAM (oi, transmit_delay)); | |
2882 | lsah->ls_age = htons (ls_age); | |
2883 | ||
2884 | length += ntohs (lsa->data->length); | |
2885 | count++; | |
2886 | ||
2887 | list_delete_node (update, node); | |
2888 | ospf_lsa_unlock (lsa); | |
2889 | } | |
2890 | ||
2891 | /* Now set #LSAs. */ | |
3a9eb091 | 2892 | stream_putl_at (s, pp, count); |
718e3744 | 2893 | |
2894 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2895 | zlog_debug ("ospf_make_ls_upd: Stop"); |
718e3744 | 2896 | return length; |
2897 | } | |
2898 | ||
4dadc291 | 2899 | static int |
52dc7ee6 | 2900 | ospf_make_ls_ack (struct ospf_interface *oi, struct list *ack, struct stream *s) |
718e3744 | 2901 | { |
52dc7ee6 | 2902 | struct list *rm_list; |
2903 | struct listnode *node; | |
718e3744 | 2904 | u_int16_t length = OSPF_LS_ACK_MIN_SIZE; |
9985f83c | 2905 | unsigned long delta = stream_get_endp(s) + 24; |
718e3744 | 2906 | struct ospf_lsa *lsa; |
2907 | ||
2908 | rm_list = list_new (); | |
2909 | ||
1eb8ef25 | 2910 | for (ALL_LIST_ELEMENTS_RO (ack, node, lsa)) |
718e3744 | 2911 | { |
1eb8ef25 | 2912 | lsa = listgetdata (node); |
718e3744 | 2913 | assert (lsa); |
2914 | ||
86f1fd96 | 2915 | if (length + delta > ospf_packet_max (oi)) |
718e3744 | 2916 | break; |
2917 | ||
2918 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
2919 | length += OSPF_LSA_HEADER_SIZE; | |
2920 | ||
2921 | listnode_add (rm_list, lsa); | |
2922 | } | |
2923 | ||
2924 | /* Remove LSA from LS-Ack list. */ | |
1eb8ef25 | 2925 | /* XXX: this loop should be removed and the list move done in previous |
2926 | * loop | |
2927 | */ | |
2928 | for (ALL_LIST_ELEMENTS_RO (rm_list, node, lsa)) | |
718e3744 | 2929 | { |
718e3744 | 2930 | listnode_delete (ack, lsa); |
2931 | ospf_lsa_unlock (lsa); | |
2932 | } | |
2933 | ||
2934 | list_delete (rm_list); | |
2935 | ||
2936 | return length; | |
2937 | } | |
2938 | ||
2939 | void | |
2940 | ospf_hello_send_sub (struct ospf_interface *oi, struct in_addr *addr) | |
2941 | { | |
2942 | struct ospf_packet *op; | |
2943 | u_int16_t length = OSPF_HEADER_SIZE; | |
2944 | ||
2945 | op = ospf_packet_new (oi->ifp->mtu); | |
2946 | ||
2947 | /* Prepare OSPF common header. */ | |
2948 | ospf_make_header (OSPF_MSG_HELLO, oi, op->s); | |
2949 | ||
2950 | /* Prepare OSPF Hello body. */ | |
2951 | length += ospf_make_hello (oi, op->s); | |
2952 | ||
2953 | /* Fill OSPF header. */ | |
2954 | ospf_fill_header (oi, op->s, length); | |
2955 | ||
2956 | /* Set packet length. */ | |
2957 | op->length = length; | |
2958 | ||
2959 | op->dst.s_addr = addr->s_addr; | |
2960 | ||
2961 | /* Add packet to the interface output queue. */ | |
2962 | ospf_packet_add (oi, op); | |
2963 | ||
2964 | /* Hook thread to write packet. */ | |
020709f9 | 2965 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 2966 | } |
2967 | ||
4dadc291 | 2968 | static void |
718e3744 | 2969 | ospf_poll_send (struct ospf_nbr_nbma *nbr_nbma) |
2970 | { | |
2971 | struct ospf_interface *oi; | |
2972 | ||
2973 | oi = nbr_nbma->oi; | |
2974 | assert(oi); | |
2975 | ||
2976 | /* If this is passive interface, do not send OSPF Hello. */ | |
2977 | if (OSPF_IF_PARAM (oi, passive_interface) == OSPF_IF_PASSIVE) | |
2978 | return; | |
2979 | ||
2980 | if (oi->type != OSPF_IFTYPE_NBMA) | |
2981 | return; | |
2982 | ||
2983 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) | |
2984 | return; | |
2985 | ||
2986 | if (PRIORITY(oi) == 0) | |
2987 | return; | |
2988 | ||
2989 | if (nbr_nbma->priority == 0 | |
2990 | && oi->state != ISM_DR && oi->state != ISM_Backup) | |
2991 | return; | |
2992 | ||
2993 | ospf_hello_send_sub (oi, &nbr_nbma->addr); | |
2994 | } | |
2995 | ||
2996 | int | |
2997 | ospf_poll_timer (struct thread *thread) | |
2998 | { | |
2999 | struct ospf_nbr_nbma *nbr_nbma; | |
3000 | ||
3001 | nbr_nbma = THREAD_ARG (thread); | |
3002 | nbr_nbma->t_poll = NULL; | |
3003 | ||
3004 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3005 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Poll timer expire)", |
718e3744 | 3006 | IF_NAME (nbr_nbma->oi), inet_ntoa (nbr_nbma->addr)); |
3007 | ||
3008 | ospf_poll_send (nbr_nbma); | |
3009 | ||
3010 | if (nbr_nbma->v_poll > 0) | |
3011 | OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, | |
3012 | nbr_nbma->v_poll); | |
3013 | ||
3014 | return 0; | |
3015 | } | |
3016 | ||
3017 | ||
3018 | int | |
3019 | ospf_hello_reply_timer (struct thread *thread) | |
3020 | { | |
3021 | struct ospf_neighbor *nbr; | |
3022 | ||
3023 | nbr = THREAD_ARG (thread); | |
3024 | nbr->t_hello_reply = NULL; | |
3025 | ||
3026 | assert (nbr->oi); | |
3027 | ||
3028 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3029 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (hello-reply timer expire)", |
718e3744 | 3030 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); |
3031 | ||
3032 | ospf_hello_send_sub (nbr->oi, &nbr->address.u.prefix4); | |
3033 | ||
3034 | return 0; | |
3035 | } | |
3036 | ||
3037 | /* Send OSPF Hello. */ | |
3038 | void | |
3039 | ospf_hello_send (struct ospf_interface *oi) | |
3040 | { | |
3041 | struct ospf_packet *op; | |
3042 | u_int16_t length = OSPF_HEADER_SIZE; | |
3043 | ||
3044 | /* If this is passive interface, do not send OSPF Hello. */ | |
3045 | if (OSPF_IF_PARAM (oi, passive_interface) == OSPF_IF_PASSIVE) | |
3046 | return; | |
3047 | ||
3048 | op = ospf_packet_new (oi->ifp->mtu); | |
3049 | ||
3050 | /* Prepare OSPF common header. */ | |
3051 | ospf_make_header (OSPF_MSG_HELLO, oi, op->s); | |
3052 | ||
3053 | /* Prepare OSPF Hello body. */ | |
3054 | length += ospf_make_hello (oi, op->s); | |
3055 | ||
3056 | /* Fill OSPF header. */ | |
3057 | ospf_fill_header (oi, op->s, length); | |
3058 | ||
3059 | /* Set packet length. */ | |
3060 | op->length = length; | |
3061 | ||
3062 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3063 | { | |
3064 | struct ospf_neighbor *nbr; | |
3065 | struct route_node *rn; | |
3066 | ||
3067 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3068 | if ((nbr = rn->info)) | |
3069 | if (nbr != oi->nbr_self) | |
3070 | if (nbr->state != NSM_Down) | |
3071 | { | |
3072 | /* RFC 2328 Section 9.5.1 | |
3073 | If the router is not eligible to become Designated Router, | |
3074 | it must periodically send Hello Packets to both the | |
3075 | Designated Router and the Backup Designated Router (if they | |
3076 | exist). */ | |
3077 | if (PRIORITY(oi) == 0 && | |
3078 | IPV4_ADDR_CMP(&DR(oi), &nbr->address.u.prefix4) && | |
3079 | IPV4_ADDR_CMP(&BDR(oi), &nbr->address.u.prefix4)) | |
3080 | continue; | |
3081 | ||
3082 | /* If the router is eligible to become Designated Router, it | |
3083 | must periodically send Hello Packets to all neighbors that | |
3084 | are also eligible. In addition, if the router is itself the | |
3085 | Designated Router or Backup Designated Router, it must also | |
3086 | send periodic Hello Packets to all other neighbors. */ | |
3087 | ||
3088 | if (nbr->priority == 0 && oi->state == ISM_DROther) | |
3089 | continue; | |
3090 | /* if oi->state == Waiting, send hello to all neighbors */ | |
3091 | { | |
3092 | struct ospf_packet *op_dup; | |
3093 | ||
3094 | op_dup = ospf_packet_dup(op); | |
3095 | op_dup->dst = nbr->address.u.prefix4; | |
3096 | ||
3097 | /* Add packet to the interface output queue. */ | |
3098 | ospf_packet_add (oi, op_dup); | |
3099 | ||
020709f9 | 3100 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3101 | } |
3102 | ||
3103 | } | |
3104 | ospf_packet_free (op); | |
3105 | } | |
3106 | else | |
3107 | { | |
3108 | /* Decide destination address. */ | |
3109 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3110 | op->dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
3111 | else | |
3112 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3113 | ||
3114 | /* Add packet to the interface output queue. */ | |
3115 | ospf_packet_add (oi, op); | |
3116 | ||
3117 | /* Hook thread to write packet. */ | |
020709f9 | 3118 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3119 | } |
3120 | } | |
3121 | ||
3122 | /* Send OSPF Database Description. */ | |
3123 | void | |
3124 | ospf_db_desc_send (struct ospf_neighbor *nbr) | |
3125 | { | |
3126 | struct ospf_interface *oi; | |
3127 | struct ospf_packet *op; | |
3128 | u_int16_t length = OSPF_HEADER_SIZE; | |
3129 | ||
3130 | oi = nbr->oi; | |
3131 | op = ospf_packet_new (oi->ifp->mtu); | |
3132 | ||
3133 | /* Prepare OSPF common header. */ | |
3134 | ospf_make_header (OSPF_MSG_DB_DESC, oi, op->s); | |
3135 | ||
3136 | /* Prepare OSPF Database Description body. */ | |
3137 | length += ospf_make_db_desc (oi, nbr, op->s); | |
3138 | ||
3139 | /* Fill OSPF header. */ | |
3140 | ospf_fill_header (oi, op->s, length); | |
3141 | ||
3142 | /* Set packet length. */ | |
3143 | op->length = length; | |
3144 | ||
3145 | /* Decide destination address. */ | |
3146 | op->dst = nbr->address.u.prefix4; | |
3147 | ||
3148 | /* Add packet to the interface output queue. */ | |
3149 | ospf_packet_add (oi, op); | |
3150 | ||
3151 | /* Hook thread to write packet. */ | |
020709f9 | 3152 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3153 | |
3154 | /* Remove old DD packet, then copy new one and keep in neighbor structure. */ | |
3155 | if (nbr->last_send) | |
3156 | ospf_packet_free (nbr->last_send); | |
3157 | nbr->last_send = ospf_packet_dup (op); | |
3158 | gettimeofday (&nbr->last_send_ts, NULL); | |
3159 | } | |
3160 | ||
3161 | /* Re-send Database Description. */ | |
3162 | void | |
3163 | ospf_db_desc_resend (struct ospf_neighbor *nbr) | |
3164 | { | |
3165 | struct ospf_interface *oi; | |
3166 | ||
3167 | oi = nbr->oi; | |
3168 | ||
3169 | /* Add packet to the interface output queue. */ | |
3170 | ospf_packet_add (oi, ospf_packet_dup (nbr->last_send)); | |
3171 | ||
3172 | /* Hook thread to write packet. */ | |
020709f9 | 3173 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3174 | } |
3175 | ||
3176 | /* Send Link State Request. */ | |
3177 | void | |
3178 | ospf_ls_req_send (struct ospf_neighbor *nbr) | |
3179 | { | |
3180 | struct ospf_interface *oi; | |
3181 | struct ospf_packet *op; | |
3182 | u_int16_t length = OSPF_HEADER_SIZE; | |
3183 | ||
3184 | oi = nbr->oi; | |
3185 | op = ospf_packet_new (oi->ifp->mtu); | |
3186 | ||
3187 | /* Prepare OSPF common header. */ | |
3188 | ospf_make_header (OSPF_MSG_LS_REQ, oi, op->s); | |
3189 | ||
3190 | /* Prepare OSPF Link State Request body. */ | |
3191 | length += ospf_make_ls_req (nbr, op->s); | |
3192 | if (length == OSPF_HEADER_SIZE) | |
3193 | { | |
3194 | ospf_packet_free (op); | |
3195 | return; | |
3196 | } | |
3197 | ||
3198 | /* Fill OSPF header. */ | |
3199 | ospf_fill_header (oi, op->s, length); | |
3200 | ||
3201 | /* Set packet length. */ | |
3202 | op->length = length; | |
3203 | ||
3204 | /* Decide destination address. */ | |
3205 | op->dst = nbr->address.u.prefix4; | |
3206 | ||
3207 | /* Add packet to the interface output queue. */ | |
3208 | ospf_packet_add (oi, op); | |
3209 | ||
3210 | /* Hook thread to write packet. */ | |
020709f9 | 3211 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3212 | |
3213 | /* Add Link State Request Retransmission Timer. */ | |
3214 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
3215 | } | |
3216 | ||
3217 | /* Send Link State Update with an LSA. */ | |
3218 | void | |
3219 | ospf_ls_upd_send_lsa (struct ospf_neighbor *nbr, struct ospf_lsa *lsa, | |
3220 | int flag) | |
3221 | { | |
52dc7ee6 | 3222 | struct list *update; |
718e3744 | 3223 | |
3224 | update = list_new (); | |
3225 | ||
3226 | listnode_add (update, lsa); | |
3227 | ospf_ls_upd_send (nbr, update, flag); | |
3228 | ||
3229 | list_delete (update); | |
3230 | } | |
3231 | ||
68b7339a | 3232 | /* Determine size for packet. Must be at least big enough to accomodate next |
3233 | * LSA on list, which may be bigger than MTU size. | |
3234 | * | |
3235 | * Return pointer to new ospf_packet | |
3236 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3237 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3238 | */ | |
3239 | static struct ospf_packet * | |
3240 | ospf_ls_upd_packet_new (struct list *update, struct ospf_interface *oi) | |
3241 | { | |
3242 | struct ospf_lsa *lsa; | |
3243 | struct listnode *ln; | |
3244 | size_t size; | |
3245 | static char warned = 0; | |
3246 | ||
1eb8ef25 | 3247 | lsa = listgetdata((ln = listhead (update))); |
68b7339a | 3248 | assert (lsa->data); |
3249 | ||
3250 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs (lsa->data->length)) | |
3251 | > ospf_packet_max (oi)) | |
3252 | { | |
3253 | if (!warned) | |
3254 | { | |
3255 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA encountered!" | |
3256 | "will need to fragment. Not optimal. Try divide up" | |
3257 | " your network with areas. Use 'debug ospf packet send'" | |
3258 | " to see details, or look at 'show ip ospf database ..'"); | |
3259 | warned = 1; | |
3260 | } | |
3261 | ||
3262 | if (IS_DEBUG_OSPF_PACKET (0, SEND)) | |
2a42e285 | 3263 | zlog_debug ("ospf_ls_upd_packet_new: oversized LSA id:%s," |
68b7339a | 3264 | " %d bytes originated by %s, will be fragmented!", |
3265 | inet_ntoa (lsa->data->id), | |
3266 | ntohs (lsa->data->length), | |
3267 | inet_ntoa (lsa->data->adv_router)); | |
3268 | ||
3269 | /* | |
3270 | * Allocate just enough to fit this LSA only, to avoid including other | |
3271 | * LSAs in fragmented LSA Updates. | |
3272 | */ | |
3273 | size = ntohs (lsa->data->length) + (oi->ifp->mtu - ospf_packet_max (oi)) | |
3274 | + OSPF_LS_UPD_MIN_SIZE; | |
3275 | } | |
3276 | else | |
3277 | size = oi->ifp->mtu; | |
3278 | ||
86f1fd96 | 3279 | /* XXX Should this be - sizeof(struct ip)?? -gdt */ |
68b7339a | 3280 | if (size > OSPF_MAX_PACKET_SIZE) |
3281 | { | |
3282 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA id:%s too big," | |
64511f39 | 3283 | " %d bytes, packet size %ld, dropping it completely." |
68b7339a | 3284 | " OSPF routing is broken!", |
37ccfa3d | 3285 | inet_ntoa (lsa->data->id), ntohs (lsa->data->length), |
62d8e96a | 3286 | (long int) size); |
68b7339a | 3287 | list_delete_node (update, ln); |
3288 | return NULL; | |
3289 | } | |
3290 | ||
3291 | return ospf_packet_new (size); | |
3292 | } | |
3293 | ||
718e3744 | 3294 | static void |
52dc7ee6 | 3295 | ospf_ls_upd_queue_send (struct ospf_interface *oi, struct list *update, |
718e3744 | 3296 | struct in_addr addr) |
3297 | { | |
3298 | struct ospf_packet *op; | |
3299 | u_int16_t length = OSPF_HEADER_SIZE; | |
3300 | ||
3301 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3302 | zlog_debug ("listcount = %d, dst %s", listcount (update), inet_ntoa(addr)); |
68b7339a | 3303 | |
3304 | op = ospf_ls_upd_packet_new (update, oi); | |
718e3744 | 3305 | |
3306 | /* Prepare OSPF common header. */ | |
3307 | ospf_make_header (OSPF_MSG_LS_UPD, oi, op->s); | |
3308 | ||
59ea14c6 | 3309 | /* Prepare OSPF Link State Update body. |
3310 | * Includes Type-7 translation. | |
3311 | */ | |
718e3744 | 3312 | length += ospf_make_ls_upd (oi, update, op->s); |
3313 | ||
3314 | /* Fill OSPF header. */ | |
3315 | ospf_fill_header (oi, op->s, length); | |
3316 | ||
3317 | /* Set packet length. */ | |
3318 | op->length = length; | |
3319 | ||
3320 | /* Decide destination address. */ | |
3321 | op->dst.s_addr = addr.s_addr; | |
3322 | ||
3323 | /* Add packet to the interface output queue. */ | |
3324 | ospf_packet_add (oi, op); | |
3325 | ||
3326 | /* Hook thread to write packet. */ | |
020709f9 | 3327 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3328 | } |
3329 | ||
3330 | static int | |
3331 | ospf_ls_upd_send_queue_event (struct thread *thread) | |
3332 | { | |
3333 | struct ospf_interface *oi = THREAD_ARG(thread); | |
3334 | struct route_node *rn; | |
736d3441 | 3335 | struct route_node *rnext; |
59ea14c6 | 3336 | struct list *update; |
68b7339a | 3337 | char again = 0; |
718e3744 | 3338 | |
3339 | oi->t_ls_upd_event = NULL; | |
3340 | ||
3341 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3342 | zlog_debug ("ospf_ls_upd_send_queue start"); |
718e3744 | 3343 | |
736d3441 | 3344 | for (rn = route_top (oi->ls_upd_queue); rn; rn = rnext) |
718e3744 | 3345 | { |
736d3441 | 3346 | rnext = route_next (rn); |
3347 | ||
718e3744 | 3348 | if (rn->info == NULL) |
736d3441 | 3349 | continue; |
68b7339a | 3350 | |
3351 | update = (struct list *)rn->info; | |
718e3744 | 3352 | |
48fe13bf | 3353 | ospf_ls_upd_queue_send (oi, update, rn->p.u.prefix4); |
718e3744 | 3354 | |
68b7339a | 3355 | /* list might not be empty. */ |
59ea14c6 | 3356 | if (listcount(update) == 0) |
3357 | { | |
3358 | list_delete (rn->info); | |
3359 | rn->info = NULL; | |
3360 | route_unlock_node (rn); | |
3361 | } | |
3362 | else | |
68b7339a | 3363 | again = 1; |
59ea14c6 | 3364 | } |
3365 | ||
3366 | if (again != 0) | |
3367 | { | |
3368 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3369 | zlog_debug ("ospf_ls_upd_send_queue: update lists not cleared," |
59ea14c6 | 3370 | " %d nodes to try again, raising new event", again); |
3371 | oi->t_ls_upd_event = | |
3372 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
718e3744 | 3373 | } |
3374 | ||
3375 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3376 | zlog_debug ("ospf_ls_upd_send_queue stop"); |
59ea14c6 | 3377 | |
718e3744 | 3378 | return 0; |
3379 | } | |
3380 | ||
3381 | void | |
52dc7ee6 | 3382 | ospf_ls_upd_send (struct ospf_neighbor *nbr, struct list *update, int flag) |
718e3744 | 3383 | { |
3384 | struct ospf_interface *oi; | |
1eb8ef25 | 3385 | struct ospf_lsa *lsa; |
718e3744 | 3386 | struct prefix_ipv4 p; |
3387 | struct route_node *rn; | |
1eb8ef25 | 3388 | struct listnode *node; |
718e3744 | 3389 | |
3390 | oi = nbr->oi; | |
3391 | ||
3392 | p.family = AF_INET; | |
3393 | p.prefixlen = IPV4_MAX_BITLEN; | |
3394 | ||
3395 | /* Decide destination address. */ | |
3396 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3397 | p.prefix = oi->vl_data->peer_addr; | |
3398 | else if (flag == OSPF_SEND_PACKET_DIRECT) | |
3399 | p.prefix = nbr->address.u.prefix4; | |
3400 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3401 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3402 | else if ((oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3403 | && (flag == OSPF_SEND_PACKET_INDIRECT)) | |
3404 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
7afa08da | 3405 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3406 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3407 | else |
3408 | p.prefix.s_addr = htonl (OSPF_ALLDROUTERS); | |
3409 | ||
3410 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3411 | { | |
3412 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
3413 | zlog_warn ("* LS-Update is directly sent on NBMA network."); | |
3414 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix.s_addr)) | |
3415 | zlog_warn ("* LS-Update is sent to myself."); | |
3416 | } | |
3417 | ||
3418 | rn = route_node_get (oi->ls_upd_queue, (struct prefix *) &p); | |
3419 | ||
3420 | if (rn->info == NULL) | |
3421 | rn->info = list_new (); | |
3422 | ||
1eb8ef25 | 3423 | for (ALL_LIST_ELEMENTS_RO (update, node, lsa)) |
3424 | { | |
3425 | ospf_lsa_lock (lsa); | |
3426 | listnode_add (rn->info, lsa); | |
3427 | } | |
718e3744 | 3428 | |
3429 | if (oi->t_ls_upd_event == NULL) | |
3430 | oi->t_ls_upd_event = | |
3431 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
3432 | } | |
3433 | ||
3434 | static void | |
52dc7ee6 | 3435 | ospf_ls_ack_send_list (struct ospf_interface *oi, struct list *ack, |
3436 | struct in_addr dst) | |
718e3744 | 3437 | { |
3438 | struct ospf_packet *op; | |
3439 | u_int16_t length = OSPF_HEADER_SIZE; | |
3440 | ||
3441 | op = ospf_packet_new (oi->ifp->mtu); | |
3442 | ||
3443 | /* Prepare OSPF common header. */ | |
3444 | ospf_make_header (OSPF_MSG_LS_ACK, oi, op->s); | |
3445 | ||
3446 | /* Prepare OSPF Link State Acknowledgment body. */ | |
3447 | length += ospf_make_ls_ack (oi, ack, op->s); | |
3448 | ||
3449 | /* Fill OSPF header. */ | |
3450 | ospf_fill_header (oi, op->s, length); | |
3451 | ||
3452 | /* Set packet length. */ | |
3453 | op->length = length; | |
3454 | ||
3455 | /* Set destination IP address. */ | |
3456 | op->dst = dst; | |
3457 | ||
3458 | /* Add packet to the interface output queue. */ | |
3459 | ospf_packet_add (oi, op); | |
3460 | ||
3461 | /* Hook thread to write packet. */ | |
020709f9 | 3462 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3463 | } |
3464 | ||
3465 | static int | |
3466 | ospf_ls_ack_send_event (struct thread *thread) | |
3467 | { | |
3468 | struct ospf_interface *oi = THREAD_ARG (thread); | |
3469 | ||
3470 | oi->t_ls_ack_direct = NULL; | |
3471 | ||
3472 | while (listcount (oi->ls_ack_direct.ls_ack)) | |
3473 | ospf_ls_ack_send_list (oi, oi->ls_ack_direct.ls_ack, | |
3474 | oi->ls_ack_direct.dst); | |
3475 | ||
3476 | return 0; | |
3477 | } | |
3478 | ||
3479 | void | |
3480 | ospf_ls_ack_send (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
3481 | { | |
3482 | struct ospf_interface *oi = nbr->oi; | |
3483 | ||
3484 | if (listcount (oi->ls_ack_direct.ls_ack) == 0) | |
3485 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
3486 | ||
3487 | listnode_add (oi->ls_ack_direct.ls_ack, ospf_lsa_lock (lsa)); | |
3488 | ||
3489 | if (oi->t_ls_ack_direct == NULL) | |
3490 | oi->t_ls_ack_direct = | |
3491 | thread_add_event (master, ospf_ls_ack_send_event, oi, 0); | |
3492 | } | |
3493 | ||
3494 | /* Send Link State Acknowledgment delayed. */ | |
3495 | void | |
3496 | ospf_ls_ack_send_delayed (struct ospf_interface *oi) | |
3497 | { | |
3498 | struct in_addr dst; | |
3499 | ||
3500 | /* Decide destination address. */ | |
3501 | /* RFC2328 Section 13.5 On non-broadcast | |
3502 | networks, delayed Link State Acknowledgment packets must be | |
3503 | unicast separately over each adjacency (i.e., neighbor whose | |
3504 | state is >= Exchange). */ | |
3505 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3506 | { | |
3507 | struct ospf_neighbor *nbr; | |
3508 | struct route_node *rn; | |
3509 | ||
3510 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3511 | if ((nbr = rn->info) != NULL) | |
3512 | if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange) | |
3513 | while (listcount (oi->ls_ack)) | |
3514 | ospf_ls_ack_send_list (oi, oi->ls_ack, nbr->address.u.prefix4); | |
3515 | return; | |
3516 | } | |
3517 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3518 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
3519 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3520 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3521 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3522 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
630e4807 | 3523 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3524 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3525 | else |
3526 | dst.s_addr = htonl (OSPF_ALLDROUTERS); | |
3527 | ||
3528 | while (listcount (oi->ls_ack)) | |
3529 | ospf_ls_ack_send_list (oi, oi->ls_ack, dst); | |
3530 | } |