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718e3744 | 1 | /* |
2 | * OSPF Sending and Receiving OSPF Packets. | |
3 | * Copyright (C) 1999, 2000 Toshiaki Takada | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
896014f4 DL |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
718e3744 | 20 | */ |
21 | ||
22 | #include <zebra.h> | |
23 | ||
cbf3e3eb | 24 | #include "monotime.h" |
718e3744 | 25 | #include "thread.h" |
26 | #include "memory.h" | |
27 | #include "linklist.h" | |
28 | #include "prefix.h" | |
29 | #include "if.h" | |
30 | #include "table.h" | |
31 | #include "sockunion.h" | |
32 | #include "stream.h" | |
33 | #include "log.h" | |
2dd8bb4e | 34 | #include "sockopt.h" |
484315fd | 35 | #include "checksum.h" |
c1a03d47 | 36 | #include "md5.h" |
7e2b7603 | 37 | #include "vrf.h" |
718e3744 | 38 | |
39 | #include "ospfd/ospfd.h" | |
40 | #include "ospfd/ospf_network.h" | |
41 | #include "ospfd/ospf_interface.h" | |
42 | #include "ospfd/ospf_ism.h" | |
43 | #include "ospfd/ospf_asbr.h" | |
44 | #include "ospfd/ospf_lsa.h" | |
45 | #include "ospfd/ospf_lsdb.h" | |
46 | #include "ospfd/ospf_neighbor.h" | |
47 | #include "ospfd/ospf_nsm.h" | |
48 | #include "ospfd/ospf_packet.h" | |
49 | #include "ospfd/ospf_spf.h" | |
50 | #include "ospfd/ospf_flood.h" | |
51 | #include "ospfd/ospf_dump.h" | |
52 | ||
166b75c2 DS |
53 | /* |
54 | * OSPF Fragmentation / fragmented writes | |
55 | * | |
56 | * ospfd can support writing fragmented packets, for cases where | |
57 | * kernel will not fragment IP_HDRINCL and/or multicast destined | |
58 | * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However, | |
59 | * SunOS, probably BSD too, clobber the user supplied IP ID and IP | |
60 | * flags fields, hence user-space fragmentation will not work. | |
61 | * Only Linux is known to leave IP header unmolested. | |
62 | * Further, fragmentation really should be done the kernel, which already | |
63 | * supports it, and which avoids nasty IP ID state problems. | |
64 | * | |
65 | * Fragmentation of OSPF packets can be required on networks with router | |
66 | * with many many interfaces active in one area, or on networks with links | |
67 | * with low MTUs. | |
68 | */ | |
69 | #ifdef GNU_LINUX | |
70 | #define WANT_OSPF_WRITE_FRAGMENT | |
71 | #endif | |
72 | ||
718e3744 | 73 | /* Packet Type String. */ |
d62a17ae | 74 | const struct message ospf_packet_type_str[] = { |
75 | {OSPF_MSG_HELLO, "Hello"}, | |
76 | {OSPF_MSG_DB_DESC, "Database Description"}, | |
77 | {OSPF_MSG_LS_REQ, "Link State Request"}, | |
78 | {OSPF_MSG_LS_UPD, "Link State Update"}, | |
79 | {OSPF_MSG_LS_ACK, "Link State Acknowledgment"}, | |
80 | {0}}; | |
718e3744 | 81 | |
75c8eabb DO |
82 | /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of |
83 | particular types, offset is the "type" field of a packet. */ | |
d62a17ae | 84 | static const u_int16_t ospf_packet_minlen[] = { |
85 | 0, | |
86 | OSPF_HELLO_MIN_SIZE, | |
87 | OSPF_DB_DESC_MIN_SIZE, | |
88 | OSPF_LS_REQ_MIN_SIZE, | |
89 | OSPF_LS_UPD_MIN_SIZE, | |
90 | OSPF_LS_ACK_MIN_SIZE, | |
75c8eabb DO |
91 | }; |
92 | ||
4e31de79 DO |
93 | /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular |
94 | types, offset is the "LSA type" field. */ | |
d62a17ae | 95 | static const u_int16_t ospf_lsa_minlen[] = { |
96 | 0, | |
97 | OSPF_ROUTER_LSA_MIN_SIZE, | |
98 | OSPF_NETWORK_LSA_MIN_SIZE, | |
99 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
100 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
101 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
102 | 0, | |
103 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
104 | 0, | |
105 | 0, | |
106 | 0, | |
107 | 0, | |
4e31de79 DO |
108 | }; |
109 | ||
bd5651f0 | 110 | /* for ospf_check_auth() */ |
d62a17ae | 111 | static int ospf_check_sum(struct ospf_header *); |
bd5651f0 | 112 | |
718e3744 | 113 | /* OSPF authentication checking function */ |
d62a17ae | 114 | static int ospf_auth_type(struct ospf_interface *oi) |
718e3744 | 115 | { |
d62a17ae | 116 | int auth_type; |
718e3744 | 117 | |
d62a17ae | 118 | if (OSPF_IF_PARAM(oi, auth_type) == OSPF_AUTH_NOTSET) |
119 | auth_type = oi->area->auth_type; | |
120 | else | |
121 | auth_type = OSPF_IF_PARAM(oi, auth_type); | |
718e3744 | 122 | |
d62a17ae | 123 | /* Handle case where MD5 key list is not configured aka Cisco */ |
124 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC | |
125 | && list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) | |
126 | return OSPF_AUTH_NULL; | |
718e3744 | 127 | |
d62a17ae | 128 | return auth_type; |
718e3744 | 129 | } |
130 | ||
d62a17ae | 131 | struct ospf_packet *ospf_packet_new(size_t size) |
718e3744 | 132 | { |
d62a17ae | 133 | struct ospf_packet *new; |
718e3744 | 134 | |
d62a17ae | 135 | new = XCALLOC(MTYPE_OSPF_PACKET, sizeof(struct ospf_packet)); |
136 | new->s = stream_new(size); | |
718e3744 | 137 | |
d62a17ae | 138 | return new; |
718e3744 | 139 | } |
140 | ||
d62a17ae | 141 | void ospf_packet_free(struct ospf_packet *op) |
718e3744 | 142 | { |
d62a17ae | 143 | if (op->s) |
144 | stream_free(op->s); | |
718e3744 | 145 | |
d62a17ae | 146 | XFREE(MTYPE_OSPF_PACKET, op); |
718e3744 | 147 | |
d62a17ae | 148 | op = NULL; |
718e3744 | 149 | } |
150 | ||
d62a17ae | 151 | struct ospf_fifo *ospf_fifo_new() |
718e3744 | 152 | { |
d62a17ae | 153 | struct ospf_fifo *new; |
718e3744 | 154 | |
d62a17ae | 155 | new = XCALLOC(MTYPE_OSPF_FIFO, sizeof(struct ospf_fifo)); |
156 | return new; | |
718e3744 | 157 | } |
158 | ||
159 | /* Add new packet to fifo. */ | |
d62a17ae | 160 | void ospf_fifo_push(struct ospf_fifo *fifo, struct ospf_packet *op) |
718e3744 | 161 | { |
d62a17ae | 162 | if (fifo->tail) |
163 | fifo->tail->next = op; | |
164 | else | |
165 | fifo->head = op; | |
718e3744 | 166 | |
d62a17ae | 167 | fifo->tail = op; |
718e3744 | 168 | |
d62a17ae | 169 | fifo->count++; |
718e3744 | 170 | } |
171 | ||
aa276fd7 | 172 | /* Add new packet to head of fifo. */ |
d62a17ae | 173 | static void ospf_fifo_push_head(struct ospf_fifo *fifo, struct ospf_packet *op) |
aa276fd7 | 174 | { |
d62a17ae | 175 | op->next = fifo->head; |
176 | ||
177 | if (fifo->tail == NULL) | |
178 | fifo->tail = op; | |
179 | ||
180 | fifo->head = op; | |
181 | ||
182 | fifo->count++; | |
aa276fd7 PJ |
183 | } |
184 | ||
718e3744 | 185 | /* Delete first packet from fifo. */ |
d62a17ae | 186 | struct ospf_packet *ospf_fifo_pop(struct ospf_fifo *fifo) |
718e3744 | 187 | { |
d62a17ae | 188 | struct ospf_packet *op; |
718e3744 | 189 | |
d62a17ae | 190 | op = fifo->head; |
718e3744 | 191 | |
d62a17ae | 192 | if (op) { |
193 | fifo->head = op->next; | |
718e3744 | 194 | |
d62a17ae | 195 | if (fifo->head == NULL) |
196 | fifo->tail = NULL; | |
718e3744 | 197 | |
d62a17ae | 198 | fifo->count--; |
199 | } | |
718e3744 | 200 | |
d62a17ae | 201 | return op; |
718e3744 | 202 | } |
203 | ||
204 | /* Return first fifo entry. */ | |
d62a17ae | 205 | struct ospf_packet *ospf_fifo_head(struct ospf_fifo *fifo) |
718e3744 | 206 | { |
d62a17ae | 207 | return fifo->head; |
718e3744 | 208 | } |
209 | ||
210 | /* Flush ospf packet fifo. */ | |
d62a17ae | 211 | void ospf_fifo_flush(struct ospf_fifo *fifo) |
718e3744 | 212 | { |
d62a17ae | 213 | struct ospf_packet *op; |
214 | struct ospf_packet *next; | |
718e3744 | 215 | |
d62a17ae | 216 | for (op = fifo->head; op; op = next) { |
217 | next = op->next; | |
218 | ospf_packet_free(op); | |
219 | } | |
220 | fifo->head = fifo->tail = NULL; | |
221 | fifo->count = 0; | |
718e3744 | 222 | } |
223 | ||
224 | /* Free ospf packet fifo. */ | |
d62a17ae | 225 | void ospf_fifo_free(struct ospf_fifo *fifo) |
718e3744 | 226 | { |
d62a17ae | 227 | ospf_fifo_flush(fifo); |
718e3744 | 228 | |
d62a17ae | 229 | XFREE(MTYPE_OSPF_FIFO, fifo); |
718e3744 | 230 | } |
231 | ||
d62a17ae | 232 | void ospf_packet_add(struct ospf_interface *oi, struct ospf_packet *op) |
718e3744 | 233 | { |
d62a17ae | 234 | if (!oi->obuf) { |
235 | zlog_err( | |
236 | "ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
237 | "destination %s) called with NULL obuf, ignoring " | |
238 | "(please report this bug)!\n", | |
239 | IF_NAME(oi), oi->state, | |
240 | lookup_msg(ospf_ism_state_msg, oi->state, NULL), | |
241 | lookup_msg(ospf_packet_type_str, | |
242 | stream_getc_from(op->s, 1), NULL), | |
243 | inet_ntoa(op->dst)); | |
244 | return; | |
245 | } | |
c3eab871 | 246 | |
d62a17ae | 247 | /* Add packet to end of queue. */ |
248 | ospf_fifo_push(oi->obuf, op); | |
718e3744 | 249 | |
d62a17ae | 250 | /* Debug of packet fifo*/ |
251 | /* ospf_fifo_debug (oi->obuf); */ | |
718e3744 | 252 | } |
253 | ||
d62a17ae | 254 | static void ospf_packet_add_top(struct ospf_interface *oi, |
255 | struct ospf_packet *op) | |
aa276fd7 | 256 | { |
d62a17ae | 257 | if (!oi->obuf) { |
258 | zlog_err( | |
259 | "ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
260 | "destination %s) called with NULL obuf, ignoring " | |
261 | "(please report this bug)!\n", | |
262 | IF_NAME(oi), oi->state, | |
263 | lookup_msg(ospf_ism_state_msg, oi->state, NULL), | |
264 | lookup_msg(ospf_packet_type_str, | |
265 | stream_getc_from(op->s, 1), NULL), | |
266 | inet_ntoa(op->dst)); | |
267 | return; | |
268 | } | |
aa276fd7 | 269 | |
d62a17ae | 270 | /* Add packet to head of queue. */ |
271 | ospf_fifo_push_head(oi->obuf, op); | |
aa276fd7 | 272 | |
d62a17ae | 273 | /* Debug of packet fifo*/ |
274 | /* ospf_fifo_debug (oi->obuf); */ | |
aa276fd7 PJ |
275 | } |
276 | ||
d62a17ae | 277 | void ospf_packet_delete(struct ospf_interface *oi) |
718e3744 | 278 | { |
d62a17ae | 279 | struct ospf_packet *op; |
280 | ||
281 | op = ospf_fifo_pop(oi->obuf); | |
718e3744 | 282 | |
d62a17ae | 283 | if (op) |
284 | ospf_packet_free(op); | |
718e3744 | 285 | } |
286 | ||
d62a17ae | 287 | struct ospf_packet *ospf_packet_dup(struct ospf_packet *op) |
718e3744 | 288 | { |
d62a17ae | 289 | struct ospf_packet *new; |
718e3744 | 290 | |
d62a17ae | 291 | if (stream_get_endp(op->s) != op->length) |
292 | /* XXX size_t */ | |
293 | zlog_warn( | |
294 | "ospf_packet_dup stream %lu ospf_packet %u size mismatch", | |
295 | (u_long)STREAM_SIZE(op->s), op->length); | |
30961a15 | 296 | |
d62a17ae | 297 | /* Reserve space for MD5 authentication that may be added later. */ |
298 | new = ospf_packet_new(stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
299 | stream_copy(new->s, op->s); | |
718e3744 | 300 | |
d62a17ae | 301 | new->dst = op->dst; |
302 | new->length = op->length; | |
718e3744 | 303 | |
d62a17ae | 304 | return new; |
718e3744 | 305 | } |
306 | ||
86f1fd96 | 307 | /* XXX inline */ |
d62a17ae | 308 | static unsigned int ospf_packet_authspace(struct ospf_interface *oi) |
86f1fd96 | 309 | { |
d62a17ae | 310 | int auth = 0; |
86f1fd96 | 311 | |
d62a17ae | 312 | if (ospf_auth_type(oi) == OSPF_AUTH_CRYPTOGRAPHIC) |
313 | auth = OSPF_AUTH_MD5_SIZE; | |
86f1fd96 | 314 | |
d62a17ae | 315 | return auth; |
86f1fd96 | 316 | } |
317 | ||
d62a17ae | 318 | static unsigned int ospf_packet_max(struct ospf_interface *oi) |
718e3744 | 319 | { |
d62a17ae | 320 | int max; |
718e3744 | 321 | |
d62a17ae | 322 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
86f1fd96 | 323 | |
d62a17ae | 324 | max -= (OSPF_HEADER_SIZE + sizeof(struct ip)); |
718e3744 | 325 | |
d62a17ae | 326 | return max; |
718e3744 | 327 | } |
328 | ||
6b0655a2 | 329 | |
d62a17ae | 330 | static int ospf_check_md5_digest(struct ospf_interface *oi, |
331 | struct ospf_header *ospfh) | |
718e3744 | 332 | { |
d62a17ae | 333 | MD5_CTX ctx; |
334 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; | |
335 | struct crypt_key *ck; | |
336 | struct ospf_neighbor *nbr; | |
337 | u_int16_t length = ntohs(ospfh->length); | |
338 | ||
339 | /* Get secret key. */ | |
340 | ck = ospf_crypt_key_lookup(OSPF_IF_PARAM(oi, auth_crypt), | |
341 | ospfh->u.crypt.key_id); | |
342 | if (ck == NULL) { | |
343 | zlog_warn("interface %s: ospf_check_md5 no key %d", IF_NAME(oi), | |
344 | ospfh->u.crypt.key_id); | |
345 | return 0; | |
346 | } | |
718e3744 | 347 | |
d62a17ae | 348 | /* check crypto seqnum. */ |
349 | nbr = ospf_nbr_lookup_by_routerid(oi->nbrs, &ospfh->router_id); | |
718e3744 | 350 | |
d62a17ae | 351 | if (nbr |
352 | && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) { | |
353 | zlog_warn( | |
354 | "interface %s: ospf_check_md5 bad sequence %d (expect %d)", | |
355 | IF_NAME(oi), ntohl(ospfh->u.crypt.crypt_seqnum), | |
356 | ntohl(nbr->crypt_seqnum)); | |
357 | return 0; | |
358 | } | |
718e3744 | 359 | |
d62a17ae | 360 | /* Generate a digest for the ospf packet - their digest + our digest. */ |
361 | memset(&ctx, 0, sizeof(ctx)); | |
362 | MD5Init(&ctx); | |
363 | MD5Update(&ctx, ospfh, length); | |
364 | MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); | |
365 | MD5Final(digest, &ctx); | |
366 | ||
367 | /* compare the two */ | |
368 | if (memcmp((caddr_t)ospfh + length, digest, OSPF_AUTH_MD5_SIZE)) { | |
369 | zlog_warn("interface %s: ospf_check_md5 checksum mismatch", | |
370 | IF_NAME(oi)); | |
371 | return 0; | |
372 | } | |
718e3744 | 373 | |
d62a17ae | 374 | /* save neighbor's crypt_seqnum */ |
375 | if (nbr) | |
376 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
377 | return 1; | |
718e3744 | 378 | } |
379 | ||
380 | /* This function is called from ospf_write(), it will detect the | |
381 | authentication scheme and if it is MD5, it will change the sequence | |
382 | and update the MD5 digest. */ | |
d62a17ae | 383 | static int ospf_make_md5_digest(struct ospf_interface *oi, |
384 | struct ospf_packet *op) | |
385 | { | |
386 | struct ospf_header *ospfh; | |
387 | unsigned char digest[OSPF_AUTH_MD5_SIZE] = {0}; | |
388 | MD5_CTX ctx; | |
389 | void *ibuf; | |
390 | u_int32_t t; | |
391 | struct crypt_key *ck; | |
392 | const u_int8_t *auth_key; | |
393 | ||
394 | ibuf = STREAM_DATA(op->s); | |
395 | ospfh = (struct ospf_header *)ibuf; | |
396 | ||
397 | if (ntohs(ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
398 | return 0; | |
399 | ||
400 | /* We do this here so when we dup a packet, we don't have to | |
401 | waste CPU rewriting other headers. | |
402 | ||
403 | Note that quagga_time /deliberately/ is not used here */ | |
404 | t = (time(NULL) & 0xFFFFFFFF); | |
405 | if (t > oi->crypt_seqnum) | |
406 | oi->crypt_seqnum = t; | |
407 | else | |
408 | oi->crypt_seqnum++; | |
409 | ||
410 | ospfh->u.crypt.crypt_seqnum = htonl(oi->crypt_seqnum); | |
411 | ||
412 | /* Get MD5 Authentication key from auth_key list. */ | |
413 | if (list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) | |
414 | auth_key = (const u_int8_t *)digest; | |
415 | else { | |
416 | ck = listgetdata(listtail(OSPF_IF_PARAM(oi, auth_crypt))); | |
417 | auth_key = ck->auth_key; | |
418 | } | |
718e3744 | 419 | |
d62a17ae | 420 | /* Generate a digest for the entire packet + our secret key. */ |
421 | memset(&ctx, 0, sizeof(ctx)); | |
422 | MD5Init(&ctx); | |
423 | MD5Update(&ctx, ibuf, ntohs(ospfh->length)); | |
424 | MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
425 | MD5Final(digest, &ctx); | |
718e3744 | 426 | |
d62a17ae | 427 | /* Append md5 digest to the end of the stream. */ |
428 | stream_put(op->s, digest, OSPF_AUTH_MD5_SIZE); | |
718e3744 | 429 | |
d62a17ae | 430 | /* We do *NOT* increment the OSPF header length. */ |
431 | op->length = ntohs(ospfh->length) + OSPF_AUTH_MD5_SIZE; | |
30961a15 | 432 | |
d62a17ae | 433 | if (stream_get_endp(op->s) != op->length) |
434 | /* XXX size_t */ | |
435 | zlog_warn( | |
436 | "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u", | |
437 | (u_long)stream_get_endp(op->s), op->length); | |
718e3744 | 438 | |
d62a17ae | 439 | return OSPF_AUTH_MD5_SIZE; |
718e3744 | 440 | } |
441 | ||
6b0655a2 | 442 | |
d62a17ae | 443 | static int ospf_ls_req_timer(struct thread *thread) |
718e3744 | 444 | { |
d62a17ae | 445 | struct ospf_neighbor *nbr; |
718e3744 | 446 | |
d62a17ae | 447 | nbr = THREAD_ARG(thread); |
448 | nbr->t_ls_req = NULL; | |
718e3744 | 449 | |
d62a17ae | 450 | /* Send Link State Request. */ |
451 | if (ospf_ls_request_count(nbr)) | |
452 | ospf_ls_req_send(nbr); | |
718e3744 | 453 | |
d62a17ae | 454 | /* Set Link State Request retransmission timer. */ |
455 | OSPF_NSM_TIMER_ON(nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
718e3744 | 456 | |
d62a17ae | 457 | return 0; |
718e3744 | 458 | } |
459 | ||
d62a17ae | 460 | void ospf_ls_req_event(struct ospf_neighbor *nbr) |
718e3744 | 461 | { |
d62a17ae | 462 | if (nbr->t_ls_req) { |
463 | thread_cancel(nbr->t_ls_req); | |
464 | nbr->t_ls_req = NULL; | |
465 | } | |
466 | nbr->t_ls_req = NULL; | |
467 | thread_add_event(master, ospf_ls_req_timer, nbr, 0, &nbr->t_ls_req); | |
718e3744 | 468 | } |
469 | ||
470 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
471 | ospf_neighbor.c */ | |
d62a17ae | 472 | int ospf_ls_upd_timer(struct thread *thread) |
473 | { | |
474 | struct ospf_neighbor *nbr; | |
475 | ||
476 | nbr = THREAD_ARG(thread); | |
477 | nbr->t_ls_upd = NULL; | |
478 | ||
479 | /* Send Link State Update. */ | |
480 | if (ospf_ls_retransmit_count(nbr) > 0) { | |
481 | struct list *update; | |
482 | struct ospf_lsdb *lsdb; | |
483 | int i; | |
484 | int retransmit_interval; | |
485 | ||
486 | retransmit_interval = | |
487 | OSPF_IF_PARAM(nbr->oi, retransmit_interval); | |
488 | ||
489 | lsdb = &nbr->ls_rxmt; | |
490 | update = list_new(); | |
491 | ||
492 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { | |
493 | struct route_table *table = lsdb->type[i].db; | |
494 | struct route_node *rn; | |
495 | ||
496 | for (rn = route_top(table); rn; rn = route_next(rn)) { | |
497 | struct ospf_lsa *lsa; | |
498 | ||
499 | if ((lsa = rn->info) != NULL) { | |
500 | /* Don't retransmit an LSA if we | |
501 | received it within | |
502 | the last RxmtInterval seconds - this | |
503 | is to allow the | |
504 | neighbour a chance to acknowledge the | |
505 | LSA as it may | |
506 | have ben just received before the | |
507 | retransmit timer | |
508 | fired. This is a small tweak to what | |
509 | is in the RFC, | |
510 | but it will cut out out a lot of | |
511 | retransmit traffic | |
512 | - MAG */ | |
513 | if (monotime_since(&lsa->tv_recv, NULL) | |
514 | >= retransmit_interval * 1000000LL) | |
515 | listnode_add(update, rn->info); | |
516 | } | |
517 | } | |
518 | } | |
718e3744 | 519 | |
d62a17ae | 520 | if (listcount(update) > 0) |
996c9314 LB |
521 | ospf_ls_upd_send(nbr, update, OSPF_SEND_PACKET_DIRECT, |
522 | 0); | |
affe9e99 | 523 | list_delete_and_null(&update); |
718e3744 | 524 | } |
525 | ||
d62a17ae | 526 | /* Set LS Update retransmission timer. */ |
527 | OSPF_NSM_TIMER_ON(nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
718e3744 | 528 | |
d62a17ae | 529 | return 0; |
718e3744 | 530 | } |
531 | ||
d62a17ae | 532 | int ospf_ls_ack_timer(struct thread *thread) |
718e3744 | 533 | { |
d62a17ae | 534 | struct ospf_interface *oi; |
718e3744 | 535 | |
d62a17ae | 536 | oi = THREAD_ARG(thread); |
537 | oi->t_ls_ack = NULL; | |
718e3744 | 538 | |
d62a17ae | 539 | /* Send Link State Acknowledgment. */ |
540 | if (listcount(oi->ls_ack) > 0) | |
541 | ospf_ls_ack_send_delayed(oi); | |
718e3744 | 542 | |
d62a17ae | 543 | /* Set LS Ack timer. */ |
544 | OSPF_ISM_TIMER_ON(oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
718e3744 | 545 | |
d62a17ae | 546 | return 0; |
718e3744 | 547 | } |
548 | ||
0bfeca3f | 549 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 550 | static void ospf_write_frags(int fd, struct ospf_packet *op, struct ip *iph, |
551 | struct msghdr *msg, unsigned int maxdatasize, | |
552 | unsigned int mtu, int flags, u_char type) | |
0bfeca3f | 553 | { |
554 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
d62a17ae | 555 | u_int16_t offset; |
556 | struct iovec *iovp; | |
557 | int ret; | |
558 | ||
559 | assert(op->length == stream_get_endp(op->s)); | |
560 | assert(msg->msg_iovlen == 2); | |
561 | ||
562 | /* we can but try. | |
563 | * | |
564 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
565 | * well as the IP_MF flag, making this all quite pointless. | |
566 | * | |
567 | * However, for a system on which IP_MF is left alone, and ip_id left | |
568 | * alone or else which sets same ip_id for each fragment this might | |
569 | * work, eg linux. | |
570 | * | |
571 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
572 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
573 | * be raised against the various kernels. | |
574 | */ | |
575 | ||
576 | /* set More Frag */ | |
577 | iph->ip_off |= IP_MF; | |
578 | ||
579 | /* ip frag offset is expressed in units of 8byte words */ | |
580 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
581 | ||
582 | iovp = &msg->msg_iov[1]; | |
583 | ||
584 | while ((stream_get_endp(op->s) - stream_get_getp(op->s)) | |
585 | > maxdatasize) { | |
586 | /* data length of this frag is to next offset value */ | |
587 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; | |
588 | iph->ip_len = iovp->iov_len + sizeof(struct ip); | |
589 | assert(iph->ip_len <= mtu); | |
590 | ||
591 | sockopt_iphdrincl_swab_htosys(iph); | |
592 | ||
593 | ret = sendmsg(fd, msg, flags); | |
594 | ||
595 | sockopt_iphdrincl_swab_systoh(iph); | |
596 | ||
597 | if (ret < 0) | |
598 | zlog_warn( | |
599 | "*** ospf_write_frags: sendmsg failed to %s," | |
600 | " id %d, off %d, len %d, mtu %u failed with %s", | |
601 | inet_ntoa(iph->ip_dst), iph->ip_id, iph->ip_off, | |
602 | iph->ip_len, mtu, safe_strerror(errno)); | |
603 | ||
604 | if (IS_DEBUG_OSPF_PACKET(type - 1, SEND)) { | |
605 | zlog_debug( | |
606 | "ospf_write_frags: sent id %d, off %d, len %d to %s\n", | |
607 | iph->ip_id, iph->ip_off, iph->ip_len, | |
608 | inet_ntoa(iph->ip_dst)); | |
609 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) { | |
610 | zlog_debug( | |
611 | "-----------------IP Header Dump----------------------"); | |
612 | ospf_ip_header_dump(iph); | |
613 | zlog_debug( | |
614 | "-----------------------------------------------------"); | |
615 | } | |
616 | } | |
617 | ||
618 | iph->ip_off += offset; | |
619 | stream_forward_getp(op->s, iovp->iov_len); | |
2d34fb80 | 620 | iovp->iov_base = stream_pnt(op->s); |
d62a17ae | 621 | } |
622 | ||
623 | /* setup for final fragment */ | |
624 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp(op->s); | |
625 | iph->ip_len = iovp->iov_len + sizeof(struct ip); | |
626 | iph->ip_off &= (~IP_MF); | |
0bfeca3f | 627 | } |
628 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
629 | ||
d62a17ae | 630 | static int ospf_write(struct thread *thread) |
631 | { | |
632 | struct ospf *ospf = THREAD_ARG(thread); | |
633 | struct ospf_interface *oi; | |
634 | struct ospf_interface *last_serviced_oi = NULL; | |
635 | struct ospf_packet *op; | |
636 | struct sockaddr_in sa_dst; | |
637 | struct ip iph; | |
638 | struct msghdr msg; | |
639 | struct iovec iov[2]; | |
640 | u_char type; | |
641 | int ret; | |
642 | int flags = 0; | |
643 | struct listnode *node; | |
0bfeca3f | 644 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 645 | static u_int16_t ipid = 0; |
646 | u_int16_t maxdatasize; | |
9d303b37 | 647 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
68b7339a | 648 | #define OSPF_WRITE_IPHL_SHIFT 2 |
d62a17ae | 649 | int pkt_count = 0; |
e1b18df1 CS |
650 | |
651 | #ifdef GNU_LINUX | |
e7503eab CS |
652 | unsigned char cmsgbuf[64] = {}; |
653 | struct cmsghdr *cm = (struct cmsghdr *)cmsgbuf; | |
654 | struct in_pktinfo *pi; | |
e1b18df1 | 655 | #endif |
d62a17ae | 656 | |
657 | ospf->t_write = NULL; | |
718e3744 | 658 | |
d62a17ae | 659 | node = listhead(ospf->oi_write_q); |
660 | assert(node); | |
661 | oi = listgetdata(node); | |
662 | assert(oi); | |
0bfeca3f | 663 | |
664 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
d62a17ae | 665 | /* seed ipid static with low order bits of time */ |
666 | if (ipid == 0) | |
667 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 668 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
669 | ||
d62a17ae | 670 | while ((pkt_count < ospf->write_oi_count) && oi |
671 | && (last_serviced_oi != oi)) { | |
672 | /* If there is only packet in the queue, the oi is removed from | |
673 | write-q, so fix up the last interface that was serviced */ | |
674 | if (last_serviced_oi == NULL) { | |
675 | last_serviced_oi = oi; | |
676 | } | |
677 | pkt_count++; | |
233cc0fb | 678 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 679 | /* convenience - max OSPF data per packet */ |
680 | maxdatasize = oi->ifp->mtu - sizeof(struct ip); | |
233cc0fb | 681 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
d62a17ae | 682 | /* Get one packet from queue. */ |
683 | op = ospf_fifo_head(oi->obuf); | |
684 | assert(op); | |
685 | assert(op->length >= OSPF_HEADER_SIZE); | |
686 | ||
687 | if (op->dst.s_addr == htonl(OSPF_ALLSPFROUTERS) | |
688 | || op->dst.s_addr == htonl(OSPF_ALLDROUTERS)) | |
689 | ospf_if_ipmulticast(ospf, oi->address, | |
690 | oi->ifp->ifindex); | |
691 | ||
692 | /* Rewrite the md5 signature & update the seq */ | |
693 | ospf_make_md5_digest(oi, op); | |
694 | ||
695 | /* Retrieve OSPF packet type. */ | |
696 | stream_set_getp(op->s, 1); | |
697 | type = stream_getc(op->s); | |
698 | ||
699 | /* reset get pointer */ | |
700 | stream_set_getp(op->s, 0); | |
701 | ||
702 | memset(&iph, 0, sizeof(struct ip)); | |
703 | memset(&sa_dst, 0, sizeof(sa_dst)); | |
704 | ||
705 | sa_dst.sin_family = AF_INET; | |
6f0e3f6e | 706 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 707 | sa_dst.sin_len = sizeof(sa_dst); |
6f0e3f6e | 708 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
d62a17ae | 709 | sa_dst.sin_addr = op->dst; |
710 | sa_dst.sin_port = htons(0); | |
711 | ||
712 | /* Set DONTROUTE flag if dst is unicast. */ | |
713 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
714 | if (!IN_MULTICAST(htonl(op->dst.s_addr))) | |
715 | flags = MSG_DONTROUTE; | |
716 | ||
717 | iph.ip_hl = sizeof(struct ip) >> OSPF_WRITE_IPHL_SHIFT; | |
718 | /* it'd be very strange for header to not be 4byte-word aligned | |
719 | * but.. */ | |
720 | if (sizeof(struct ip) | |
721 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT)) | |
722 | iph.ip_hl++; /* we presume sizeof struct ip cant | |
723 | overflow ip_hl.. */ | |
724 | ||
725 | iph.ip_v = IPVERSION; | |
726 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; | |
727 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; | |
68b7339a | 728 | |
0150c9c9 | 729 | #if defined(__DragonFly__) |
d62a17ae | 730 | /* |
731 | * DragonFly's raw socket expects ip_len/ip_off in network byte | |
732 | * order. | |
733 | */ | |
734 | iph.ip_len = htons(iph.ip_len); | |
0150c9c9 DB |
735 | #endif |
736 | ||
0bfeca3f | 737 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 738 | /* XXX-MT: not thread-safe at all.. |
739 | * XXX: this presumes this is only programme sending OSPF | |
740 | * packets | |
741 | * otherwise, no guarantee ipid will be unique | |
742 | */ | |
743 | iph.ip_id = ++ipid; | |
0bfeca3f | 744 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
745 | ||
d62a17ae | 746 | iph.ip_off = 0; |
747 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
748 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
749 | else | |
750 | iph.ip_ttl = OSPF_IP_TTL; | |
751 | iph.ip_p = IPPROTO_OSPFIGP; | |
752 | iph.ip_sum = 0; | |
753 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
754 | iph.ip_dst.s_addr = op->dst.s_addr; | |
755 | ||
756 | memset(&msg, 0, sizeof(msg)); | |
757 | msg.msg_name = (caddr_t)&sa_dst; | |
758 | msg.msg_namelen = sizeof(sa_dst); | |
759 | msg.msg_iov = iov; | |
760 | msg.msg_iovlen = 2; | |
e7503eab | 761 | |
d62a17ae | 762 | iov[0].iov_base = (char *)&iph; |
763 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; | |
2d34fb80 | 764 | iov[1].iov_base = stream_pnt(op->s); |
d62a17ae | 765 | iov[1].iov_len = op->length; |
766 | ||
e1b18df1 CS |
767 | #ifdef GNU_LINUX |
768 | msg.msg_control = (caddr_t)cm; | |
e7503eab CS |
769 | cm->cmsg_level = SOL_IP; |
770 | cm->cmsg_type = IP_PKTINFO; | |
771 | cm->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
772 | pi = (struct in_pktinfo *)CMSG_DATA(cm); | |
773 | pi->ipi_ifindex = oi->ifp->ifindex; | |
774 | ||
775 | msg.msg_controllen = cm->cmsg_len; | |
e1b18df1 | 776 | #endif |
e7503eab | 777 | |
996c9314 LB |
778 | /* Sadly we can not rely on kernels to fragment packets |
779 | * because of either IP_HDRINCL and/or multicast | |
780 | * destination being set. | |
781 | */ | |
e7503eab | 782 | |
0bfeca3f | 783 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 784 | if (op->length > maxdatasize) |
785 | ospf_write_frags(ospf->fd, op, &iph, &msg, maxdatasize, | |
786 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 787 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 788 | |
d62a17ae | 789 | /* send final fragment (could be first) */ |
790 | sockopt_iphdrincl_swab_htosys(&iph); | |
791 | ret = sendmsg(ospf->fd, &msg, flags); | |
792 | sockopt_iphdrincl_swab_systoh(&iph); | |
793 | if (IS_DEBUG_OSPF_EVENT) | |
794 | zlog_debug( | |
795 | "ospf_write to %s, " | |
796 | "id %d, off %d, len %d, interface %s, mtu %u:", | |
797 | inet_ntoa(iph.ip_dst), iph.ip_id, iph.ip_off, | |
798 | iph.ip_len, oi->ifp->name, oi->ifp->mtu); | |
799 | ||
800 | if (ret < 0) | |
801 | zlog_warn( | |
802 | "*** sendmsg in ospf_write failed to %s, " | |
803 | "id %d, off %d, len %d, interface %s, mtu %u: %s", | |
804 | inet_ntoa(iph.ip_dst), iph.ip_id, iph.ip_off, | |
805 | iph.ip_len, oi->ifp->name, oi->ifp->mtu, | |
806 | safe_strerror(errno)); | |
807 | ||
808 | /* Show debug sending packet. */ | |
809 | if (IS_DEBUG_OSPF_PACKET(type - 1, SEND)) { | |
810 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) { | |
811 | zlog_debug( | |
812 | "-----------------------------------------------------"); | |
813 | ospf_ip_header_dump(&iph); | |
814 | stream_set_getp(op->s, 0); | |
815 | ospf_packet_dump(op->s); | |
816 | } | |
817 | ||
818 | zlog_debug("%s sent to [%s] via [%s].", | |
819 | lookup_msg(ospf_packet_type_str, type, NULL), | |
820 | inet_ntoa(op->dst), IF_NAME(oi)); | |
821 | ||
822 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) | |
823 | zlog_debug( | |
824 | "-----------------------------------------------------"); | |
825 | } | |
826 | ||
c9339663 | 827 | switch (type) { |
996c9314 LB |
828 | case OSPF_MSG_HELLO: |
829 | oi->hello_out++; | |
830 | break; | |
831 | case OSPF_MSG_DB_DESC: | |
832 | oi->db_desc_out++; | |
833 | break; | |
834 | case OSPF_MSG_LS_REQ: | |
835 | oi->ls_req_out++; | |
836 | break; | |
837 | case OSPF_MSG_LS_UPD: | |
838 | oi->ls_upd_out++; | |
839 | break; | |
840 | case OSPF_MSG_LS_ACK: | |
841 | oi->ls_ack_out++; | |
842 | break; | |
843 | default: | |
844 | break; | |
c9339663 CS |
845 | } |
846 | ||
d62a17ae | 847 | /* Now delete packet from queue. */ |
848 | ospf_packet_delete(oi); | |
849 | ||
850 | /* Move this interface to the tail of write_q to | |
851 | serve everyone in a round robin fashion */ | |
852 | list_delete_node(ospf->oi_write_q, node); | |
853 | if (ospf_fifo_head(oi->obuf) == NULL) { | |
854 | oi->on_write_q = 0; | |
855 | last_serviced_oi = NULL; | |
856 | oi = NULL; | |
857 | } else { | |
858 | listnode_add(ospf->oi_write_q, oi); | |
e8f45e82 | 859 | } |
d62a17ae | 860 | |
861 | /* Setup to service from the head of the queue again */ | |
862 | if (!list_isempty(ospf->oi_write_q)) { | |
863 | node = listhead(ospf->oi_write_q); | |
864 | assert(node); | |
865 | oi = listgetdata(node); | |
866 | assert(oi); | |
867 | } | |
868 | } | |
869 | ||
870 | /* If packets still remain in queue, call write thread. */ | |
871 | if (!list_isempty(ospf->oi_write_q)) { | |
872 | ospf->t_write = NULL; | |
873 | thread_add_write(master, ospf_write, ospf, ospf->fd, | |
874 | &ospf->t_write); | |
e8f45e82 | 875 | } |
718e3744 | 876 | |
d62a17ae | 877 | return 0; |
718e3744 | 878 | } |
879 | ||
880 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
d62a17ae | 881 | static void ospf_hello(struct ip *iph, struct ospf_header *ospfh, |
882 | struct stream *s, struct ospf_interface *oi, int size) | |
883 | { | |
884 | struct ospf_hello *hello; | |
885 | struct ospf_neighbor *nbr; | |
886 | int old_state; | |
887 | struct prefix p; | |
888 | ||
889 | /* increment statistics. */ | |
890 | oi->hello_in++; | |
891 | ||
2d34fb80 | 892 | hello = (struct ospf_hello *)stream_pnt(s); |
d62a17ae | 893 | |
894 | /* If Hello is myself, silently discard. */ | |
895 | if (IPV4_ADDR_SAME(&ospfh->router_id, &oi->ospf->router_id)) { | |
896 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) { | |
897 | zlog_debug( | |
898 | "ospf_header[%s/%s]: selforiginated, " | |
899 | "dropping.", | |
900 | lookup_msg(ospf_packet_type_str, ospfh->type, | |
901 | NULL), | |
902 | inet_ntoa(iph->ip_src)); | |
903 | } | |
904 | return; | |
905 | } | |
906 | ||
907 | /* get neighbor prefix. */ | |
908 | p.family = AF_INET; | |
909 | p.prefixlen = ip_masklen(hello->network_mask); | |
910 | p.u.prefix4 = iph->ip_src; | |
911 | ||
912 | /* Compare network mask. */ | |
913 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
914 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
915 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
916 | if (oi->address->prefixlen != p.prefixlen) { | |
917 | zlog_warn( | |
918 | "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).", | |
919 | inet_ntoa(ospfh->router_id), IF_NAME(oi), | |
920 | (int)oi->address->prefixlen, (int)p.prefixlen); | |
921 | return; | |
922 | } | |
923 | ||
924 | /* Compare Router Dead Interval. */ | |
925 | if (OSPF_IF_PARAM(oi, v_wait) != ntohl(hello->dead_interval)) { | |
926 | zlog_warn( | |
927 | "Packet %s [Hello:RECV]: RouterDeadInterval mismatch " | |
928 | "(expected %u, but received %u).", | |
929 | inet_ntoa(ospfh->router_id), OSPF_IF_PARAM(oi, v_wait), | |
930 | ntohl(hello->dead_interval)); | |
931 | return; | |
932 | } | |
933 | ||
934 | /* Compare Hello Interval - ignored if fast-hellos are set. */ | |
935 | if (OSPF_IF_PARAM(oi, fast_hello) == 0) { | |
936 | if (OSPF_IF_PARAM(oi, v_hello) | |
937 | != ntohs(hello->hello_interval)) { | |
938 | zlog_warn( | |
939 | "Packet %s [Hello:RECV]: HelloInterval mismatch " | |
940 | "(expected %u, but received %u).", | |
941 | inet_ntoa(ospfh->router_id), | |
942 | OSPF_IF_PARAM(oi, v_hello), | |
943 | ntohs(hello->hello_interval)); | |
944 | return; | |
945 | } | |
946 | } | |
947 | ||
948 | if (IS_DEBUG_OSPF_EVENT) | |
b5a8894d | 949 | zlog_debug("Packet %s [Hello:RECV]: Options %s vrf %s", |
d62a17ae | 950 | inet_ntoa(ospfh->router_id), |
b5a8894d CS |
951 | ospf_options_dump(hello->options), |
952 | ospf_vrf_id_to_name(oi->ospf->vrf_id)); | |
d62a17ae | 953 | |
954 | /* Compare options. */ | |
718e3744 | 955 | #define REJECT_IF_TBIT_ON 1 /* XXX */ |
956 | #ifdef REJECT_IF_TBIT_ON | |
d62a17ae | 957 | if (CHECK_FLAG(hello->options, OSPF_OPTION_MT)) { |
958 | /* | |
959 | * This router does not support non-zero TOS. | |
960 | * Drop this Hello packet not to establish neighbor | |
961 | * relationship. | |
962 | */ | |
963 | zlog_warn("Packet %s [Hello:RECV]: T-bit on, drop it.", | |
964 | inet_ntoa(ospfh->router_id)); | |
965 | return; | |
966 | } | |
718e3744 | 967 | #endif /* REJECT_IF_TBIT_ON */ |
968 | ||
d62a17ae | 969 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
970 | && CHECK_FLAG(hello->options, OSPF_OPTION_O)) { | |
971 | /* | |
972 | * This router does know the correct usage of O-bit | |
973 | * the bit should be set in DD packet only. | |
974 | */ | |
975 | zlog_warn("Packet %s [Hello:RECV]: O-bit abuse?", | |
976 | inet_ntoa(ospfh->router_id)); | |
718e3744 | 977 | #ifdef STRICT_OBIT_USAGE_CHECK |
d62a17ae | 978 | return; /* Reject this packet. */ |
979 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
980 | UNSET_FLAG(hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
981 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
982 | } | |
718e3744 | 983 | |
d62a17ae | 984 | /* new for NSSA is to ensure that NP is on and E is off */ |
985 | ||
986 | if (oi->area->external_routing == OSPF_AREA_NSSA) { | |
987 | if (!(CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_NP) | |
988 | && CHECK_FLAG(hello->options, OSPF_OPTION_NP) | |
989 | && !CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_E) | |
990 | && !CHECK_FLAG(hello->options, OSPF_OPTION_E))) { | |
991 | zlog_warn( | |
992 | "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", | |
993 | inet_ntoa(ospfh->router_id), OPTIONS(oi), | |
994 | hello->options); | |
995 | return; | |
996 | } | |
997 | if (IS_DEBUG_OSPF_NSSA) | |
998 | zlog_debug("NSSA-Hello:RECV:Packet from %s:", | |
999 | inet_ntoa(ospfh->router_id)); | |
1000 | } else | |
1001 | /* The setting of the E-bit found in the Hello Packet's Options | |
1002 | field must match this area's ExternalRoutingCapability A | |
1003 | mismatch causes processing to stop and the packet to be | |
1004 | dropped. The setting of the rest of the bits in the Hello | |
1005 | Packet's Options field should be ignored. */ | |
1006 | if (CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_E) | |
1007 | != CHECK_FLAG(hello->options, OSPF_OPTION_E)) { | |
1008 | zlog_warn( | |
1009 | "Packet %s [Hello:RECV]: my options: %x, his options %x", | |
1010 | inet_ntoa(ospfh->router_id), OPTIONS(oi), | |
1011 | hello->options); | |
1012 | return; | |
1013 | } | |
718e3744 | 1014 | |
d62a17ae | 1015 | /* get neighbour struct */ |
1016 | nbr = ospf_nbr_get(oi, ospfh, iph, &p); | |
1017 | ||
1018 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
1019 | assert(nbr); | |
1020 | ||
1021 | old_state = nbr->state; | |
1022 | ||
1023 | /* Add event to thread. */ | |
1024 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1025 | ||
1026 | /* RFC2328 Section 9.5.1 | |
1027 | If the router is not eligible to become Designated Router, | |
1028 | (snip) It must also send an Hello Packet in reply to an | |
1029 | Hello Packet received from any eligible neighbor (other than | |
1030 | the current Designated Router and Backup Designated Router). */ | |
1031 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1032 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
1033 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
1034 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
1035 | OSPF_NSM_TIMER_ON(nbr->t_hello_reply, | |
1036 | ospf_hello_reply_timer, | |
1037 | OSPF_HELLO_REPLY_DELAY); | |
1038 | ||
1039 | /* on NBMA network type, it happens to receive bidirectional Hello | |
1040 | packet | |
1041 | without advance 1-Way Received event. | |
1042 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
1043 | if (oi->type == OSPF_IFTYPE_NBMA | |
1044 | && (old_state == NSM_Down || old_state == NSM_Attempt)) { | |
1045 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_OneWayReceived); | |
1046 | nbr->priority = hello->priority; | |
1047 | nbr->d_router = hello->d_router; | |
1048 | nbr->bd_router = hello->bd_router; | |
1049 | return; | |
1050 | } | |
1051 | ||
1052 | if (ospf_nbr_bidirectional(&oi->ospf->router_id, hello->neighbors, | |
1053 | size - OSPF_HELLO_MIN_SIZE)) { | |
1054 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_TwoWayReceived); | |
1055 | nbr->options |= hello->options; | |
1056 | } else { | |
1057 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_OneWayReceived); | |
1058 | /* Set neighbor information. */ | |
1059 | nbr->priority = hello->priority; | |
1060 | nbr->d_router = hello->d_router; | |
1061 | nbr->bd_router = hello->bd_router; | |
1062 | return; | |
1063 | } | |
1064 | ||
1065 | /* If neighbor itself declares DR and no BDR exists, | |
1066 | cause event BackupSeen */ | |
1067 | if (IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->d_router)) | |
1068 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
1069 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_BackupSeen); | |
1070 | ||
1071 | /* neighbor itself declares BDR. */ | |
1072 | if (oi->state == ISM_Waiting | |
1073 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->bd_router)) | |
1074 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_BackupSeen); | |
1075 | ||
1076 | /* had not previously. */ | |
1077 | if ((IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->d_router) | |
1078 | && IPV4_ADDR_CMP(&nbr->address.u.prefix4, &nbr->d_router)) | |
1079 | || (IPV4_ADDR_CMP(&nbr->address.u.prefix4, &hello->d_router) | |
1080 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &nbr->d_router))) | |
1081 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1082 | ||
1083 | /* had not previously. */ | |
1084 | if ((IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->bd_router) | |
1085 | && IPV4_ADDR_CMP(&nbr->address.u.prefix4, &nbr->bd_router)) | |
1086 | || (IPV4_ADDR_CMP(&nbr->address.u.prefix4, &hello->bd_router) | |
1087 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &nbr->bd_router))) | |
1088 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1089 | ||
1090 | /* Neighbor priority check. */ | |
1091 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
1092 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1093 | ||
1094 | /* Set neighbor information. */ | |
1095 | nbr->priority = hello->priority; | |
1096 | nbr->d_router = hello->d_router; | |
1097 | nbr->bd_router = hello->bd_router; | |
718e3744 | 1098 | } |
1099 | ||
1100 | /* Save DD flags/options/Seqnum received. */ | |
d62a17ae | 1101 | static void ospf_db_desc_save_current(struct ospf_neighbor *nbr, |
1102 | struct ospf_db_desc *dd) | |
718e3744 | 1103 | { |
d62a17ae | 1104 | nbr->last_recv.flags = dd->flags; |
1105 | nbr->last_recv.options = dd->options; | |
1106 | nbr->last_recv.dd_seqnum = ntohl(dd->dd_seqnum); | |
718e3744 | 1107 | } |
1108 | ||
1109 | /* Process rest of DD packet. */ | |
d62a17ae | 1110 | static void ospf_db_desc_proc(struct stream *s, struct ospf_interface *oi, |
1111 | struct ospf_neighbor *nbr, | |
1112 | struct ospf_db_desc *dd, u_int16_t size) | |
1113 | { | |
1114 | struct ospf_lsa *new, *find; | |
1115 | struct lsa_header *lsah; | |
1116 | ||
1117 | stream_forward_getp(s, OSPF_DB_DESC_MIN_SIZE); | |
1118 | for (size -= OSPF_DB_DESC_MIN_SIZE; size >= OSPF_LSA_HEADER_SIZE; | |
1119 | size -= OSPF_LSA_HEADER_SIZE) { | |
2d34fb80 | 1120 | lsah = (struct lsa_header *)stream_pnt(s); |
d62a17ae | 1121 | stream_forward_getp(s, OSPF_LSA_HEADER_SIZE); |
1122 | ||
1123 | /* Unknown LS type. */ | |
1124 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) { | |
1125 | zlog_warn("Packet [DD:RECV]: Unknown LS type %d.", | |
1126 | lsah->type); | |
1127 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1128 | return; | |
1129 | } | |
1130 | ||
1131 | if (IS_OPAQUE_LSA(lsah->type) | |
1132 | && !CHECK_FLAG(nbr->options, OSPF_OPTION_O)) { | |
1133 | zlog_warn("LSA[Type%d:%s]: Opaque capability mismatch?", | |
1134 | lsah->type, inet_ntoa(lsah->id)); | |
1135 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1136 | return; | |
1137 | } | |
1138 | ||
1139 | switch (lsah->type) { | |
1140 | case OSPF_AS_EXTERNAL_LSA: | |
1141 | case OSPF_OPAQUE_AS_LSA: | |
1142 | /* Check for stub area. Reject if AS-External from stub | |
1143 | but | |
1144 | allow if from NSSA. */ | |
1145 | if (oi->area->external_routing == OSPF_AREA_STUB) { | |
1146 | zlog_warn( | |
1147 | "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", | |
1148 | lsah->type, inet_ntoa(lsah->id), | |
1149 | (oi->area->external_routing | |
1150 | == OSPF_AREA_STUB) | |
1151 | ? "STUB" | |
1152 | : "NSSA"); | |
1153 | OSPF_NSM_EVENT_SCHEDULE(nbr, | |
1154 | NSM_SeqNumberMismatch); | |
1155 | return; | |
1156 | } | |
1157 | break; | |
1158 | default: | |
1159 | break; | |
1160 | } | |
1161 | ||
1162 | /* Create LS-request object. */ | |
1163 | new = ospf_ls_request_new(lsah); | |
1164 | ||
1165 | /* Lookup received LSA, then add LS request list. */ | |
1166 | find = ospf_lsa_lookup_by_header(oi->area, lsah); | |
1167 | ||
1168 | /* ospf_lsa_more_recent is fine with NULL pointers */ | |
1169 | switch (ospf_lsa_more_recent(find, new)) { | |
1170 | case -1: | |
1171 | /* Neighbour has a more recent LSA, we must request it | |
1172 | */ | |
1173 | ospf_ls_request_add(nbr, new); | |
1174 | /* fallthru */ | |
1175 | case 0: | |
1176 | /* If we have a copy of this LSA, it's either less | |
1177 | * recent | |
1178 | * and we're requesting it from neighbour (the case | |
1179 | * above), or | |
1180 | * it's as recent and we both have same copy (this | |
1181 | * case). | |
1182 | * | |
1183 | * In neither of these two cases is there any point in | |
1184 | * describing our copy of the LSA to the neighbour in a | |
1185 | * DB-Summary packet, if we're still intending to do so. | |
1186 | * | |
1187 | * See: draft-ogier-ospf-dbex-opt-00.txt, describing the | |
1188 | * backward compatible optimisation to OSPF DB Exchange | |
1189 | * / | |
1190 | * DB Description process implemented here. | |
1191 | */ | |
1192 | if (find) | |
1193 | ospf_lsdb_delete(&nbr->db_sum, find); | |
1194 | ospf_lsa_discard(new); | |
1195 | break; | |
1196 | default: | |
1197 | /* We have the more recent copy, nothing specific to do: | |
1198 | * - no need to request neighbours stale copy | |
1199 | * - must leave DB summary list copy alone | |
1200 | */ | |
1201 | if (IS_DEBUG_OSPF_EVENT) | |
1202 | zlog_debug( | |
1203 | "Packet [DD:RECV]: LSA received Type %d, " | |
1204 | "ID %s is not recent.", | |
1205 | lsah->type, inet_ntoa(lsah->id)); | |
1206 | ospf_lsa_discard(new); | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | /* Master */ | |
1211 | if (IS_SET_DD_MS(nbr->dd_flags)) { | |
1212 | nbr->dd_seqnum++; | |
1213 | ||
1214 | /* Both sides have no More, then we're done with Exchange */ | |
1215 | if (!IS_SET_DD_M(dd->flags) && !IS_SET_DD_M(nbr->dd_flags)) | |
1216 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_ExchangeDone); | |
1217 | else | |
1218 | ospf_db_desc_send(nbr); | |
1219 | } | |
1220 | /* Slave */ | |
1221 | else { | |
1222 | nbr->dd_seqnum = ntohl(dd->dd_seqnum); | |
1223 | ||
1224 | /* Send DD packet in reply. | |
1225 | * | |
1226 | * Must be done to acknowledge the Master's DD, regardless of | |
1227 | * whether we have more LSAs ourselves to describe. | |
1228 | * | |
1229 | * This function will clear the 'More' bit, if after this DD | |
1230 | * we have no more LSAs to describe to the master.. | |
1231 | */ | |
1232 | ospf_db_desc_send(nbr); | |
1233 | ||
1234 | /* Slave can raise ExchangeDone now, if master is also done */ | |
1235 | if (!IS_SET_DD_M(dd->flags) && !IS_SET_DD_M(nbr->dd_flags)) | |
1236 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_ExchangeDone); | |
1237 | } | |
1238 | ||
1239 | /* Save received neighbor values from DD. */ | |
1240 | ospf_db_desc_save_current(nbr, dd); | |
1241 | ||
1242 | if (!nbr->t_ls_req) | |
1243 | ospf_ls_req_send(nbr); | |
1244 | } | |
1245 | ||
1246 | static int ospf_db_desc_is_dup(struct ospf_db_desc *dd, | |
1247 | struct ospf_neighbor *nbr) | |
1248 | { | |
1249 | /* Is DD duplicated? */ | |
1250 | if (dd->options == nbr->last_recv.options | |
1251 | && dd->flags == nbr->last_recv.flags | |
1252 | && dd->dd_seqnum == htonl(nbr->last_recv.dd_seqnum)) | |
1253 | return 1; | |
1254 | ||
1255 | return 0; | |
718e3744 | 1256 | } |
1257 | ||
1258 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
d62a17ae | 1259 | static void ospf_db_desc(struct ip *iph, struct ospf_header *ospfh, |
1260 | struct stream *s, struct ospf_interface *oi, | |
1261 | u_int16_t size) | |
1262 | { | |
1263 | struct ospf_db_desc *dd; | |
1264 | struct ospf_neighbor *nbr; | |
d363df2c | 1265 | |
d62a17ae | 1266 | /* Increment statistics. */ |
1267 | oi->db_desc_in++; | |
718e3744 | 1268 | |
2d34fb80 | 1269 | dd = (struct ospf_db_desc *)stream_pnt(s); |
d62a17ae | 1270 | |
1271 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1272 | if (nbr == NULL) { | |
1273 | zlog_warn("Packet[DD]: Unknown Neighbor %s", | |
1274 | inet_ntoa(ospfh->router_id)); | |
1275 | return; | |
718e3744 | 1276 | } |
d62a17ae | 1277 | |
1278 | /* Check MTU. */ | |
1279 | if ((OSPF_IF_PARAM(oi, mtu_ignore) == 0) | |
1280 | && (ntohs(dd->mtu) > oi->ifp->mtu)) { | |
1281 | zlog_warn( | |
1282 | "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", | |
1283 | inet_ntoa(nbr->router_id), ntohs(dd->mtu), IF_NAME(oi), | |
1284 | oi->ifp->mtu); | |
1285 | return; | |
718e3744 | 1286 | } |
1287 | ||
d62a17ae | 1288 | /* |
1289 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is | |
1290 | * not | |
1291 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1292 | * Until proper solution is developped, this hack should help. | |
1293 | * | |
1294 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1295 | * options, unfortunately its use in DD options is not specified. Hence | |
1296 | * some | |
1297 | * implementations follow E-bit semantics and set it in DD options, and | |
1298 | * some | |
1299 | * treat it as unspecified and hence follow the directive "default for | |
1300 | * options is clear", ie unset. | |
1301 | * | |
1302 | * Reset the flag, as ospfd follows E-bit semantics. | |
1303 | */ | |
1304 | if ((oi->area->external_routing == OSPF_AREA_NSSA) | |
1305 | && (CHECK_FLAG(nbr->options, OSPF_OPTION_NP)) | |
1306 | && (!CHECK_FLAG(dd->options, OSPF_OPTION_NP))) { | |
1307 | if (IS_DEBUG_OSPF_EVENT) | |
1308 | zlog_debug( | |
1309 | "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", | |
1310 | inet_ntoa(nbr->router_id)); | |
1311 | SET_FLAG(dd->options, OSPF_OPTION_NP); | |
718e3744 | 1312 | } |
1313 | ||
d62a17ae | 1314 | #ifdef REJECT_IF_TBIT_ON |
1315 | if (CHECK_FLAG(dd->options, OSPF_OPTION_MT)) { | |
1316 | /* | |
1317 | * In Hello protocol, optional capability must have checked | |
1318 | * to prevent this T-bit enabled router be my neighbor. | |
1319 | */ | |
1320 | zlog_warn("Packet[DD]: Neighbor %s: T-bit on?", | |
1321 | inet_ntoa(nbr->router_id)); | |
1322 | return; | |
1323 | } | |
1324 | #endif /* REJECT_IF_TBIT_ON */ | |
1325 | ||
1326 | if (CHECK_FLAG(dd->options, OSPF_OPTION_O) | |
1327 | && !CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) { | |
1328 | /* | |
1329 | * This node is not configured to handle O-bit, for now. | |
1330 | * Clear it to ignore unsupported capability proposed by | |
1331 | * neighbor. | |
1332 | */ | |
1333 | UNSET_FLAG(dd->options, OSPF_OPTION_O); | |
1334 | } | |
1335 | ||
1336 | /* Add event to thread. */ | |
1337 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1338 | ||
1339 | /* Process DD packet by neighbor status. */ | |
1340 | switch (nbr->state) { | |
1341 | case NSM_Down: | |
1342 | case NSM_Attempt: | |
1343 | case NSM_TwoWay: | |
1344 | zlog_warn( | |
1345 | "Packet[DD]: Neighbor %s state is %s, packet discarded.", | |
1346 | inet_ntoa(nbr->router_id), | |
1347 | lookup_msg(ospf_nsm_state_msg, nbr->state, NULL)); | |
1348 | break; | |
1349 | case NSM_Init: | |
1350 | OSPF_NSM_EVENT_EXECUTE(nbr, NSM_TwoWayReceived); | |
1351 | /* If the new state is ExStart, the processing of the current | |
1352 | packet should then continue in this new state by falling | |
1353 | through to case ExStart below. */ | |
1354 | if (nbr->state != NSM_ExStart) | |
1355 | break; | |
1356 | /* fallthru */ | |
1357 | case NSM_ExStart: | |
1358 | /* Initial DBD */ | |
1359 | if ((IS_SET_DD_ALL(dd->flags) == OSPF_DD_FLAG_ALL) | |
1360 | && (size == OSPF_DB_DESC_MIN_SIZE)) { | |
1361 | if (IPV4_ADDR_CMP(&nbr->router_id, &oi->ospf->router_id) | |
1362 | > 0) { | |
1363 | /* We're Slave---obey */ | |
05ba78e4 CS |
1364 | if (CHECK_FLAG(oi->ospf->config, |
1365 | OSPF_LOG_ADJACENCY_DETAIL)) | |
996c9314 LB |
1366 | zlog_info( |
1367 | "Packet[DD]: Neighbor %s Negotiation done (Slave).", | |
1368 | inet_ntoa(nbr->router_id)); | |
05ba78e4 | 1369 | |
d62a17ae | 1370 | nbr->dd_seqnum = ntohl(dd->dd_seqnum); |
1371 | ||
1372 | /* Reset I/MS */ | |
1373 | UNSET_FLAG(nbr->dd_flags, | |
1374 | (OSPF_DD_FLAG_MS | OSPF_DD_FLAG_I)); | |
1375 | } else { | |
1376 | /* We're Master, ignore the initial DBD from | |
1377 | * Slave */ | |
05ba78e4 CS |
1378 | if (CHECK_FLAG(oi->ospf->config, |
1379 | OSPF_LOG_ADJACENCY_DETAIL)) | |
1380 | zlog_info( | |
1381 | "Packet[DD]: Neighbor %s: Initial DBD from Slave, " | |
1382 | "ignoring.", | |
1383 | inet_ntoa(nbr->router_id)); | |
d62a17ae | 1384 | break; |
1385 | } | |
1386 | } | |
1387 | /* Ack from the Slave */ | |
1388 | else if (!IS_SET_DD_MS(dd->flags) && !IS_SET_DD_I(dd->flags) | |
1389 | && ntohl(dd->dd_seqnum) == nbr->dd_seqnum | |
1390 | && IPV4_ADDR_CMP(&nbr->router_id, &oi->ospf->router_id) | |
1391 | < 0) { | |
1392 | zlog_info( | |
1393 | "Packet[DD]: Neighbor %s Negotiation done (Master).", | |
1394 | inet_ntoa(nbr->router_id)); | |
1395 | /* Reset I, leaving MS */ | |
1396 | UNSET_FLAG(nbr->dd_flags, OSPF_DD_FLAG_I); | |
1397 | } else { | |
1398 | zlog_warn("Packet[DD]: Neighbor %s Negotiation fails.", | |
1399 | inet_ntoa(nbr->router_id)); | |
1400 | break; | |
1401 | } | |
1402 | ||
1403 | /* This is where the real Options are saved */ | |
1404 | nbr->options = dd->options; | |
1405 | ||
1406 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) { | |
1407 | if (IS_DEBUG_OSPF_EVENT) | |
1408 | zlog_debug( | |
1409 | "Neighbor[%s] is %sOpaque-capable.", | |
1410 | inet_ntoa(nbr->router_id), | |
1411 | CHECK_FLAG(nbr->options, OSPF_OPTION_O) | |
1412 | ? "" | |
1413 | : "NOT "); | |
1414 | ||
1415 | if (!CHECK_FLAG(nbr->options, OSPF_OPTION_O) | |
1416 | && IPV4_ADDR_SAME(&DR(oi), | |
1417 | &nbr->address.u.prefix4)) { | |
1418 | zlog_warn( | |
1419 | "DR-neighbor[%s] is NOT opaque-capable; " | |
1420 | "Opaque-LSAs cannot be reliably advertised " | |
1421 | "in this network.", | |
1422 | inet_ntoa(nbr->router_id)); | |
1423 | /* This situation is undesirable, but not a real | |
1424 | * error. */ | |
1425 | } | |
1426 | } | |
1427 | ||
1428 | OSPF_NSM_EVENT_EXECUTE(nbr, NSM_NegotiationDone); | |
1429 | ||
1430 | /* continue processing rest of packet. */ | |
1431 | ospf_db_desc_proc(s, oi, nbr, dd, size); | |
1432 | break; | |
1433 | case NSM_Exchange: | |
1434 | if (ospf_db_desc_is_dup(dd, nbr)) { | |
1435 | if (IS_SET_DD_MS(nbr->dd_flags)) | |
1436 | /* Master: discard duplicated DD packet. */ | |
1437 | zlog_info( | |
1438 | "Packet[DD] (Master): Neighbor %s packet duplicated.", | |
1439 | inet_ntoa(nbr->router_id)); | |
1440 | else | |
1441 | /* Slave: cause to retransmit the last Database | |
1442 | Description. */ | |
1443 | { | |
1444 | zlog_info( | |
1445 | "Packet[DD] [Slave]: Neighbor %s packet duplicated.", | |
1446 | inet_ntoa(nbr->router_id)); | |
1447 | ospf_db_desc_resend(nbr); | |
1448 | } | |
1449 | break; | |
1450 | } | |
1451 | ||
1452 | /* Otherwise DD packet should be checked. */ | |
1453 | /* Check Master/Slave bit mismatch */ | |
1454 | if (IS_SET_DD_MS(dd->flags) | |
1455 | != IS_SET_DD_MS(nbr->last_recv.flags)) { | |
1456 | zlog_warn("Packet[DD]: Neighbor %s MS-bit mismatch.", | |
1457 | inet_ntoa(nbr->router_id)); | |
1458 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1459 | if (IS_DEBUG_OSPF_EVENT) | |
1460 | zlog_debug( | |
1461 | "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", | |
1462 | dd->flags, nbr->dd_flags); | |
1463 | break; | |
1464 | } | |
1465 | ||
1466 | /* Check initialize bit is set. */ | |
1467 | if (IS_SET_DD_I(dd->flags)) { | |
1468 | zlog_info("Packet[DD]: Neighbor %s I-bit set.", | |
1469 | inet_ntoa(nbr->router_id)); | |
1470 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1471 | break; | |
1472 | } | |
1473 | ||
1474 | /* Check DD Options. */ | |
1475 | if (dd->options != nbr->options) { | |
718e3744 | 1476 | #ifdef ORIGINAL_CODING |
d62a17ae | 1477 | /* Save the new options for debugging */ |
1478 | nbr->options = dd->options; | |
718e3744 | 1479 | #endif /* ORIGINAL_CODING */ |
d62a17ae | 1480 | zlog_warn("Packet[DD]: Neighbor %s options mismatch.", |
1481 | inet_ntoa(nbr->router_id)); | |
1482 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1483 | break; | |
1484 | } | |
718e3744 | 1485 | |
d62a17ae | 1486 | /* Check DD sequence number. */ |
1487 | if ((IS_SET_DD_MS(nbr->dd_flags) | |
1488 | && ntohl(dd->dd_seqnum) != nbr->dd_seqnum) | |
1489 | || (!IS_SET_DD_MS(nbr->dd_flags) | |
1490 | && ntohl(dd->dd_seqnum) != nbr->dd_seqnum + 1)) { | |
1491 | zlog_warn( | |
1492 | "Packet[DD]: Neighbor %s sequence number mismatch.", | |
1493 | inet_ntoa(nbr->router_id)); | |
1494 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1495 | break; | |
1496 | } | |
1497 | ||
1498 | /* Continue processing rest of packet. */ | |
1499 | ospf_db_desc_proc(s, oi, nbr, dd, size); | |
1500 | break; | |
1501 | case NSM_Loading: | |
1502 | case NSM_Full: | |
1503 | if (ospf_db_desc_is_dup(dd, nbr)) { | |
1504 | if (IS_SET_DD_MS(nbr->dd_flags)) { | |
1505 | /* Master should discard duplicate DD packet. */ | |
1506 | zlog_info( | |
1507 | "Packet[DD]: Neighbor %s duplicated, " | |
1508 | "packet discarded.", | |
1509 | inet_ntoa(nbr->router_id)); | |
1510 | break; | |
1511 | } else { | |
1512 | if (monotime_since(&nbr->last_send_ts, NULL) | |
1513 | < nbr->v_inactivity * 1000000LL) { | |
1514 | /* In states Loading and Full the slave | |
1515 | must resend | |
1516 | its last Database Description packet | |
1517 | in response to | |
1518 | duplicate Database Description | |
1519 | packets received | |
1520 | from the master. For this reason the | |
1521 | slave must | |
1522 | wait RouterDeadInterval seconds | |
1523 | before freeing the | |
1524 | last Database Description packet. | |
1525 | Reception of a | |
1526 | Database Description packet from the | |
1527 | master after | |
1528 | this interval will generate a | |
1529 | SeqNumberMismatch | |
1530 | neighbor event. RFC2328 Section 10.8 | |
1531 | */ | |
1532 | ospf_db_desc_resend(nbr); | |
1533 | break; | |
1534 | } | |
1535 | } | |
718e3744 | 1536 | } |
718e3744 | 1537 | |
d62a17ae | 1538 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); |
1539 | break; | |
1540 | default: | |
1541 | zlog_warn("Packet[DD]: Neighbor %s NSM illegal status %u.", | |
1542 | inet_ntoa(nbr->router_id), nbr->state); | |
1543 | break; | |
1544 | } | |
718e3744 | 1545 | } |
1546 | ||
1547 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1548 | ||
1549 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
d62a17ae | 1550 | static void ospf_ls_req(struct ip *iph, struct ospf_header *ospfh, |
1551 | struct stream *s, struct ospf_interface *oi, | |
1552 | u_int16_t size) | |
1553 | { | |
1554 | struct ospf_neighbor *nbr; | |
1555 | u_int32_t ls_type; | |
1556 | struct in_addr ls_id; | |
1557 | struct in_addr adv_router; | |
1558 | struct ospf_lsa *find; | |
1559 | struct list *ls_upd; | |
1560 | unsigned int length; | |
1561 | ||
1562 | /* Increment statistics. */ | |
1563 | oi->ls_req_in++; | |
1564 | ||
1565 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1566 | if (nbr == NULL) { | |
1567 | zlog_warn("Link State Request: Unknown Neighbor %s.", | |
1568 | inet_ntoa(ospfh->router_id)); | |
1569 | return; | |
718e3744 | 1570 | } |
1571 | ||
d62a17ae | 1572 | /* Add event to thread. */ |
1573 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1574 | ||
1575 | /* Neighbor State should be Exchange or later. */ | |
1576 | if (nbr->state != NSM_Exchange && nbr->state != NSM_Loading | |
1577 | && nbr->state != NSM_Full) { | |
1578 | zlog_warn( | |
1579 | "Link State Request received from %s: " | |
1580 | "Neighbor state is %s, packet discarded.", | |
1581 | inet_ntoa(ospfh->router_id), | |
1582 | lookup_msg(ospf_nsm_state_msg, nbr->state, NULL)); | |
1583 | return; | |
718e3744 | 1584 | } |
1585 | ||
d62a17ae | 1586 | /* Send Link State Update for ALL requested LSAs. */ |
1587 | ls_upd = list_new(); | |
1588 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1589 | ||
1590 | while (size >= OSPF_LSA_KEY_SIZE) { | |
1591 | /* Get one slice of Link State Request. */ | |
1592 | ls_type = stream_getl(s); | |
1593 | ls_id.s_addr = stream_get_ipv4(s); | |
1594 | adv_router.s_addr = stream_get_ipv4(s); | |
1595 | ||
1596 | /* Verify LSA type. */ | |
1597 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) { | |
1598 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
affe9e99 | 1599 | list_delete_and_null(&ls_upd); |
d62a17ae | 1600 | return; |
1601 | } | |
718e3744 | 1602 | |
d62a17ae | 1603 | /* Search proper LSA in LSDB. */ |
b5a8894d CS |
1604 | find = ospf_lsa_lookup(oi->ospf, oi->area, ls_type, ls_id, |
1605 | adv_router); | |
d62a17ae | 1606 | if (find == NULL) { |
1607 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
affe9e99 | 1608 | list_delete_and_null(&ls_upd); |
d62a17ae | 1609 | return; |
1610 | } | |
718e3744 | 1611 | |
d62a17ae | 1612 | /* Packet overflows MTU size, send immediately. */ |
1613 | if (length + ntohs(find->data->length) > ospf_packet_max(oi)) { | |
1614 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1615 | ospf_ls_upd_send(nbr, ls_upd, | |
046460a1 | 1616 | OSPF_SEND_PACKET_DIRECT, 0); |
d62a17ae | 1617 | else |
1618 | ospf_ls_upd_send(nbr, ls_upd, | |
046460a1 | 1619 | OSPF_SEND_PACKET_INDIRECT, 0); |
d62a17ae | 1620 | |
1621 | /* Only remove list contents. Keep ls_upd. */ | |
1622 | list_delete_all_node(ls_upd); | |
718e3744 | 1623 | |
d62a17ae | 1624 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; |
1625 | } | |
1626 | ||
1627 | /* Append LSA to update list. */ | |
1628 | listnode_add(ls_upd, find); | |
1629 | length += ntohs(find->data->length); | |
718e3744 | 1630 | |
d62a17ae | 1631 | size -= OSPF_LSA_KEY_SIZE; |
1632 | } | |
718e3744 | 1633 | |
d62a17ae | 1634 | /* Send rest of Link State Update. */ |
1635 | if (listcount(ls_upd) > 0) { | |
1636 | if (oi->type == OSPF_IFTYPE_NBMA) | |
996c9314 LB |
1637 | ospf_ls_upd_send(nbr, ls_upd, OSPF_SEND_PACKET_DIRECT, |
1638 | 0); | |
d62a17ae | 1639 | else |
996c9314 LB |
1640 | ospf_ls_upd_send(nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT, |
1641 | 0); | |
718e3744 | 1642 | |
affe9e99 | 1643 | list_delete_and_null(&ls_upd); |
d62a17ae | 1644 | } else |
acdf5e25 | 1645 | list_delete_and_null(&ls_upd); |
718e3744 | 1646 | } |
1647 | ||
1648 | /* Get the list of LSAs from Link State Update packet. | |
1649 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
d62a17ae | 1650 | static struct list *ospf_ls_upd_list_lsa(struct ospf_neighbor *nbr, |
1651 | struct stream *s, | |
1652 | struct ospf_interface *oi, size_t size) | |
1653 | { | |
1654 | u_int16_t count, sum; | |
1655 | u_int32_t length; | |
1656 | struct lsa_header *lsah; | |
1657 | struct ospf_lsa *lsa; | |
1658 | struct list *lsas; | |
1659 | ||
1660 | lsas = list_new(); | |
1661 | ||
1662 | count = stream_getl(s); | |
1663 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1664 | ||
1665 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
1666 | size -= length, stream_forward_getp(s, length), count--) { | |
2d34fb80 | 1667 | lsah = (struct lsa_header *)stream_pnt(s); |
d62a17ae | 1668 | length = ntohs(lsah->length); |
1669 | ||
1670 | if (length > size) { | |
1671 | zlog_warn( | |
1672 | "Link State Update: LSA length exceeds packet size."); | |
1673 | break; | |
1674 | } | |
718e3744 | 1675 | |
d62a17ae | 1676 | /* Validate the LSA's LS checksum. */ |
1677 | sum = lsah->checksum; | |
1678 | if (!ospf_lsa_checksum_valid(lsah)) { | |
1679 | /* (bug #685) more details in a one-line message make it | |
1680 | * possible | |
1681 | * to identify problem source on the one hand and to | |
1682 | * have a better | |
1683 | * chance to compress repeated messages in syslog on the | |
1684 | * other */ | |
1685 | zlog_warn( | |
1686 | "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s", | |
1687 | sum, lsah->checksum, inet_ntoa(lsah->id), | |
1688 | inet_ntoa(nbr->src), inet_ntoa(nbr->router_id), | |
1689 | inet_ntoa(lsah->adv_router)); | |
1690 | continue; | |
1691 | } | |
718e3744 | 1692 | |
d62a17ae | 1693 | /* Examine the LSA's LS type. */ |
1694 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) { | |
1695 | zlog_warn("Link State Update: Unknown LS type %d", | |
1696 | lsah->type); | |
1697 | continue; | |
1698 | } | |
718e3744 | 1699 | |
d62a17ae | 1700 | /* |
1701 | * What if the received LSA's age is greater than MaxAge? | |
1702 | * Treat it as a MaxAge case -- endo. | |
1703 | */ | |
1704 | if (ntohs(lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1705 | lsah->ls_age = htons(OSPF_LSA_MAXAGE); | |
718e3744 | 1706 | |
d62a17ae | 1707 | if (CHECK_FLAG(nbr->options, OSPF_OPTION_O)) { |
1708 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1709 | if ((IS_OPAQUE_LSA(lsah->type) | |
1710 | && !CHECK_FLAG(lsah->options, OSPF_OPTION_O)) | |
1711 | || (!IS_OPAQUE_LSA(lsah->type) | |
1712 | && CHECK_FLAG(lsah->options, OSPF_OPTION_O))) { | |
1713 | /* | |
1714 | * This neighbor must know the exact usage of | |
1715 | * O-bit; | |
1716 | * the bit will be set in Type-9,10,11 LSAs | |
1717 | * only. | |
1718 | */ | |
1719 | zlog_warn("LSA[Type%d:%s]: O-bit abuse?", | |
1720 | lsah->type, inet_ntoa(lsah->id)); | |
1721 | continue; | |
1722 | } | |
1723 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
718e3744 | 1724 | |
d62a17ae | 1725 | /* Do not take in AS External Opaque-LSAs if we are a |
1726 | * stub. */ | |
1727 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1728 | && nbr->oi->area->external_routing | |
1729 | != OSPF_AREA_DEFAULT) { | |
1730 | if (IS_DEBUG_OSPF_EVENT) | |
1731 | zlog_debug( | |
1732 | "LSA[Type%d:%s]: We are a stub, don't take this LSA.", | |
1733 | lsah->type, | |
1734 | inet_ntoa(lsah->id)); | |
1735 | continue; | |
1736 | } | |
1737 | } else if (IS_OPAQUE_LSA(lsah->type)) { | |
1738 | zlog_warn("LSA[Type%d:%s]: Opaque capability mismatch?", | |
1739 | lsah->type, inet_ntoa(lsah->id)); | |
1740 | continue; | |
1741 | } | |
718e3744 | 1742 | |
d62a17ae | 1743 | /* Create OSPF LSA instance. */ |
1744 | lsa = ospf_lsa_new(); | |
1745 | ||
b5a8894d | 1746 | lsa->vrf_id = oi->ospf->vrf_id; |
d62a17ae | 1747 | /* We may wish to put some error checking if type NSSA comes in |
1748 | and area not in NSSA mode */ | |
1749 | switch (lsah->type) { | |
1750 | case OSPF_AS_EXTERNAL_LSA: | |
1751 | case OSPF_OPAQUE_AS_LSA: | |
1752 | lsa->area = NULL; | |
1753 | break; | |
1754 | case OSPF_OPAQUE_LINK_LSA: | |
1755 | lsa->oi = oi; /* Remember incoming interface for | |
1756 | flooding control. */ | |
1757 | /* Fallthrough */ | |
1758 | default: | |
1759 | lsa->area = oi->area; | |
1760 | break; | |
1761 | } | |
718e3744 | 1762 | |
d62a17ae | 1763 | lsa->data = ospf_lsa_data_new(length); |
1764 | memcpy(lsa->data, lsah, length); | |
1765 | ||
1766 | if (IS_DEBUG_OSPF_EVENT) | |
1767 | zlog_debug( | |
1768 | "LSA[Type%d:%s]: %p new LSA created with Link State Update", | |
1769 | lsa->data->type, inet_ntoa(lsa->data->id), | |
1770 | (void *)lsa); | |
1771 | listnode_add(lsas, lsa); | |
1772 | } | |
718e3744 | 1773 | |
d62a17ae | 1774 | return lsas; |
718e3744 | 1775 | } |
1776 | ||
1777 | /* Cleanup Update list. */ | |
d62a17ae | 1778 | static void ospf_upd_list_clean(struct list *lsas) |
718e3744 | 1779 | { |
d62a17ae | 1780 | struct listnode *node, *nnode; |
1781 | struct ospf_lsa *lsa; | |
718e3744 | 1782 | |
d62a17ae | 1783 | for (ALL_LIST_ELEMENTS(lsas, node, nnode, lsa)) |
1784 | ospf_lsa_discard(lsa); | |
718e3744 | 1785 | |
affe9e99 | 1786 | list_delete_and_null(&lsas); |
718e3744 | 1787 | } |
1788 | ||
1789 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
d62a17ae | 1790 | static void ospf_ls_upd(struct ospf *ospf, struct ip *iph, |
1791 | struct ospf_header *ospfh, struct stream *s, | |
1792 | struct ospf_interface *oi, u_int16_t size) | |
1793 | { | |
1794 | struct ospf_neighbor *nbr; | |
1795 | struct list *lsas; | |
1796 | struct listnode *node, *nnode; | |
1797 | struct ospf_lsa *lsa = NULL; | |
1798 | /* unsigned long ls_req_found = 0; */ | |
1799 | ||
1800 | /* Dis-assemble the stream, update each entry, re-encapsulate for | |
1801 | * flooding */ | |
1802 | ||
1803 | /* Increment statistics. */ | |
1804 | oi->ls_upd_in++; | |
1805 | ||
1806 | /* Check neighbor. */ | |
1807 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1808 | if (nbr == NULL) { | |
1809 | zlog_warn("Link State Update: Unknown Neighbor %s on int: %s", | |
1810 | inet_ntoa(ospfh->router_id), IF_NAME(oi)); | |
1811 | return; | |
718e3744 | 1812 | } |
1813 | ||
d62a17ae | 1814 | /* Add event to thread. */ |
1815 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1816 | ||
1817 | /* Check neighbor state. */ | |
1818 | if (nbr->state < NSM_Exchange) { | |
1819 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
1820 | zlog_debug( | |
1821 | "Link State Update: " | |
1822 | "Neighbor[%s] state %s is less than Exchange", | |
1823 | inet_ntoa(ospfh->router_id), | |
1824 | lookup_msg(ospf_nsm_state_msg, nbr->state, | |
1825 | NULL)); | |
1826 | return; | |
1827 | } | |
718e3744 | 1828 | |
d62a17ae | 1829 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages |
1830 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1831 | * of section 13. | |
1832 | */ | |
1833 | lsas = ospf_ls_upd_list_lsa(nbr, s, oi, size); | |
1834 | ||
35955c14 CS |
1835 | if (lsas == NULL) |
1836 | return; | |
d62a17ae | 1837 | #define DISCARD_LSA(L, N) \ |
1838 | { \ | |
1839 | if (IS_DEBUG_OSPF_EVENT) \ | |
1840 | zlog_debug( \ | |
1841 | "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \ | |
1842 | " Type-%d", \ | |
1843 | N, (void *)lsa, (int)lsa->data->type); \ | |
1844 | ospf_lsa_discard(L); \ | |
1845 | continue; \ | |
718e3744 | 1846 | } |
1847 | ||
d62a17ae | 1848 | /* Process each LSA received in the one packet. |
1849 | * | |
1850 | * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding | |
1851 | * text below are from the steps in RFC 2328, Section 13. | |
1852 | */ | |
1853 | for (ALL_LIST_ELEMENTS(lsas, node, nnode, lsa)) { | |
1854 | struct ospf_lsa *ls_ret, *current; | |
1855 | int ret = 1; | |
1856 | ||
1857 | if (IS_DEBUG_OSPF_NSSA) { | |
1858 | char buf1[INET_ADDRSTRLEN]; | |
1859 | char buf2[INET_ADDRSTRLEN]; | |
1860 | char buf3[INET_ADDRSTRLEN]; | |
1861 | ||
1862 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", | |
1863 | lsa->data->type, | |
1864 | inet_ntop(AF_INET, &ospfh->router_id, buf1, | |
1865 | INET_ADDRSTRLEN), | |
1866 | inet_ntop(AF_INET, &lsa->data->id, buf2, | |
1867 | INET_ADDRSTRLEN), | |
1868 | inet_ntop(AF_INET, &lsa->data->adv_router, | |
1869 | buf3, INET_ADDRSTRLEN)); | |
1870 | } | |
718e3744 | 1871 | |
d62a17ae | 1872 | listnode_delete(lsas, |
1873 | lsa); /* We don't need it in list anymore */ | |
1874 | ||
1875 | /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa() | |
1876 | */ | |
1877 | ||
1878 | /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */ | |
1879 | ||
1880 | /* (3) Do not take in AS External LSAs if we are a stub or NSSA. | |
1881 | */ | |
1882 | ||
1883 | /* Do not take in AS NSSA if this neighbor and we are not NSSA | |
1884 | */ | |
1885 | ||
1886 | /* Do take in Type-7's if we are an NSSA */ | |
1887 | ||
1888 | /* If we are also an ABR, later translate them to a Type-5 | |
1889 | * packet */ | |
1890 | ||
1891 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1892 | translate them to a separate Type-5 packet. */ | |
1893 | ||
1894 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1895 | /* Reject from STUB or NSSA */ | |
1896 | if (nbr->oi->area->external_routing | |
1897 | != OSPF_AREA_DEFAULT) { | |
1898 | if (IS_DEBUG_OSPF_NSSA) | |
1899 | zlog_debug( | |
1900 | "Incoming External LSA Discarded: We are NSSA/STUB Area"); | |
1901 | DISCARD_LSA(lsa, 1); | |
1902 | } | |
1903 | ||
1904 | if (lsa->data->type == OSPF_AS_NSSA_LSA) | |
1905 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) { | |
1906 | if (IS_DEBUG_OSPF_NSSA) | |
1907 | zlog_debug( | |
1908 | "Incoming NSSA LSA Discarded: Not NSSA Area"); | |
1909 | DISCARD_LSA(lsa, 2); | |
1910 | } | |
1911 | ||
1912 | /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */ | |
1913 | if (lsa->data->type == OSPF_ROUTER_LSA) | |
1914 | if (!IPV4_ADDR_SAME(&lsa->data->id, | |
1915 | &lsa->data->adv_router)) { | |
1916 | char buf1[INET_ADDRSTRLEN]; | |
1917 | char buf2[INET_ADDRSTRLEN]; | |
1918 | char buf3[INET_ADDRSTRLEN]; | |
1919 | ||
1920 | zlog_err( | |
1921 | "Incoming Router-LSA from %s with " | |
1922 | "Adv-ID[%s] != LS-ID[%s]", | |
1923 | inet_ntop(AF_INET, &ospfh->router_id, | |
1924 | buf1, INET_ADDRSTRLEN), | |
1925 | inet_ntop(AF_INET, &lsa->data->id, buf2, | |
1926 | INET_ADDRSTRLEN), | |
1927 | inet_ntop(AF_INET, | |
1928 | &lsa->data->adv_router, buf3, | |
1929 | INET_ADDRSTRLEN)); | |
1930 | zlog_err( | |
1931 | "OSPF domain compromised by attack or corruption. " | |
1932 | "Verify correct operation of -ALL- OSPF routers."); | |
1933 | DISCARD_LSA(lsa, 0); | |
1934 | } | |
1935 | ||
1936 | /* Find the LSA in the current database. */ | |
1937 | ||
1938 | current = ospf_lsa_lookup_by_header(oi->area, lsa->data); | |
1939 | ||
1940 | /* (4) If the LSA's LS age is equal to MaxAge, and there is | |
1941 | currently | |
1942 | no instance of the LSA in the router's link state database, | |
1943 | and none of router's neighbors are in states Exchange or | |
1944 | Loading, | |
1945 | then take the following actions: */ | |
1946 | ||
1947 | if (IS_LSA_MAXAGE(lsa) && !current | |
1948 | && ospf_check_nbr_status(oi->ospf)) { | |
1949 | /* (4a) Response Link State Acknowledgment. */ | |
1950 | ospf_ls_ack_send(nbr, lsa); | |
1951 | ||
1952 | /* (4b) Discard LSA. */ | |
1953 | if (IS_DEBUG_OSPF(lsa, LSA)) { | |
1954 | zlog_debug( | |
1955 | "Link State Update[%s]: LS age is equal to MaxAge.", | |
1956 | dump_lsa_key(lsa)); | |
1957 | } | |
1958 | DISCARD_LSA(lsa, 3); | |
1959 | } | |
1960 | ||
1961 | if (IS_OPAQUE_LSA(lsa->data->type) | |
1962 | && IPV4_ADDR_SAME(&lsa->data->adv_router, | |
1963 | &oi->ospf->router_id)) { | |
1964 | /* | |
1965 | * Even if initial flushing seems to be completed, there | |
1966 | * might | |
1967 | * be a case that self-originated LSA with MaxAge still | |
1968 | * remain | |
1969 | * in the routing domain. | |
1970 | * Just send an LSAck message to cease retransmission. | |
1971 | */ | |
1972 | if (IS_LSA_MAXAGE(lsa)) { | |
1973 | zlog_warn("LSA[%s]: Boomerang effect?", | |
1974 | dump_lsa_key(lsa)); | |
1975 | ospf_ls_ack_send(nbr, lsa); | |
1976 | ospf_lsa_discard(lsa); | |
1977 | ||
1978 | if (current != NULL && !IS_LSA_MAXAGE(current)) | |
1979 | ospf_opaque_lsa_refresh_schedule( | |
1980 | current); | |
1981 | continue; | |
1982 | } | |
1983 | ||
1984 | /* | |
1985 | * If an instance of self-originated Opaque-LSA is not | |
1986 | * found | |
1987 | * in the LSDB, there are some possible cases here. | |
1988 | * | |
1989 | * 1) This node lost opaque-capability after restart. | |
1990 | * 2) Else, a part of opaque-type is no more supported. | |
1991 | * 3) Else, a part of opaque-id is no more supported. | |
1992 | * | |
1993 | * Anyway, it is still this node's responsibility to | |
1994 | * flush it. | |
1995 | * Otherwise, the LSA instance remains in the routing | |
1996 | * domain | |
1997 | * until its age reaches to MaxAge. | |
1998 | */ | |
1999 | /* XXX: We should deal with this for *ALL* LSAs, not | |
2000 | * just opaque */ | |
2001 | if (current == NULL) { | |
2002 | if (IS_DEBUG_OSPF_EVENT) | |
2003 | zlog_debug( | |
2004 | "LSA[%s]: Previously originated Opaque-LSA," | |
2005 | "not found in the LSDB.", | |
2006 | dump_lsa_key(lsa)); | |
2007 | ||
2008 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
2009 | ||
2010 | ospf_opaque_self_originated_lsa_received(nbr, | |
2011 | lsa); | |
2012 | ospf_ls_ack_send(nbr, lsa); | |
2013 | ||
2014 | continue; | |
2015 | } | |
2016 | } | |
2017 | ||
2018 | /* It might be happen that received LSA is self-originated | |
2019 | * network LSA, but | |
2020 | * router ID is changed. So, we should check if LSA is a | |
2021 | * network-LSA whose | |
2022 | * Link State ID is one of the router's own IP interface | |
2023 | * addresses but whose | |
2024 | * Advertising Router is not equal to the router's own Router ID | |
2025 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be | |
2026 | * flushed. | |
2027 | */ | |
2028 | ||
2029 | if (lsa->data->type == OSPF_NETWORK_LSA) { | |
2030 | struct listnode *oinode, *oinnode; | |
2031 | struct ospf_interface *out_if; | |
2032 | int Flag = 0; | |
2033 | ||
2034 | for (ALL_LIST_ELEMENTS(oi->ospf->oiflist, oinode, | |
2035 | oinnode, out_if)) { | |
2036 | if (out_if == NULL) | |
2037 | break; | |
2038 | ||
2039 | if ((IPV4_ADDR_SAME(&out_if->address->u.prefix4, | |
2040 | &lsa->data->id)) | |
2041 | && (!(IPV4_ADDR_SAME( | |
2042 | &oi->ospf->router_id, | |
2043 | &lsa->data->adv_router)))) { | |
2044 | if (out_if->network_lsa_self) { | |
2045 | ospf_lsa_flush_area( | |
2046 | lsa, out_if->area); | |
2047 | if (IS_DEBUG_OSPF_EVENT) | |
2048 | zlog_debug( | |
2049 | "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", | |
2050 | (void *)lsa, | |
2051 | (int)lsa->data | |
2052 | ->type); | |
2053 | ospf_lsa_discard(lsa); | |
2054 | Flag = 1; | |
2055 | } | |
2056 | break; | |
2057 | } | |
2058 | } | |
2059 | if (Flag) | |
2060 | continue; | |
2061 | } | |
2062 | ||
2063 | /* (5) Find the instance of this LSA that is currently contained | |
2064 | in the router's link state database. If there is no | |
2065 | database copy, or the received LSA is more recent than | |
2066 | the database copy the following steps must be performed. | |
2067 | (The sub steps from RFC 2328 section 13 step (5) will be | |
2068 | performed in | |
2069 | ospf_flood() ) */ | |
2070 | ||
2071 | if (current == NULL | |
2072 | || (ret = ospf_lsa_more_recent(current, lsa)) < 0) { | |
2073 | /* Actual flooding procedure. */ | |
2074 | if (ospf_flood(oi->ospf, nbr, current, lsa) | |
2075 | < 0) /* Trap NSSA later. */ | |
2076 | DISCARD_LSA(lsa, 4); | |
2077 | continue; | |
2078 | } | |
2079 | ||
2080 | /* (6) Else, If there is an instance of the LSA on the sending | |
2081 | neighbor's Link state request list, an error has occurred in | |
2082 | the Database Exchange process. In this case, restart the | |
2083 | Database Exchange process by generating the neighbor event | |
2084 | BadLSReq for the sending neighbor and stop processing the | |
2085 | Link State Update packet. */ | |
2086 | ||
2087 | if (ospf_ls_request_lookup(nbr, lsa)) { | |
2088 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
2089 | zlog_warn( | |
2090 | "LSA[%s] instance exists on Link state request list", | |
2091 | dump_lsa_key(lsa)); | |
2092 | ||
2093 | /* Clean list of LSAs. */ | |
2094 | ospf_upd_list_clean(lsas); | |
2095 | /* this lsa is not on lsas list already. */ | |
2096 | ospf_lsa_discard(lsa); | |
2097 | return; | |
2098 | } | |
2099 | ||
2100 | /* If the received LSA is the same instance as the database copy | |
2101 | (i.e., neither one is more recent) the following two steps | |
2102 | should be performed: */ | |
2103 | ||
2104 | if (ret == 0) { | |
2105 | /* If the LSA is listed in the Link state retransmission | |
2106 | list | |
2107 | for the receiving adjacency, the router itself is | |
2108 | expecting | |
2109 | an acknowledgment for this LSA. The router should | |
2110 | treat the | |
2111 | received LSA as an acknowledgment by removing the LSA | |
2112 | from | |
2113 | the Link state retransmission list. This is termed | |
2114 | an | |
2115 | "implied acknowledgment". */ | |
2116 | ||
2117 | ls_ret = ospf_ls_retransmit_lookup(nbr, lsa); | |
2118 | ||
2119 | if (ls_ret != NULL) { | |
2120 | ospf_ls_retransmit_delete(nbr, ls_ret); | |
2121 | ||
2122 | /* Delayed acknowledgment sent if advertisement | |
2123 | received | |
2124 | from Designated Router, otherwise do nothing. | |
2125 | */ | |
2126 | if (oi->state == ISM_Backup) | |
2127 | if (NBR_IS_DR(nbr)) | |
2128 | listnode_add( | |
2129 | oi->ls_ack, | |
2130 | ospf_lsa_lock(lsa)); | |
2131 | ||
2132 | DISCARD_LSA(lsa, 5); | |
2133 | } else | |
2134 | /* Acknowledge the receipt of the LSA by sending a | |
2135 | Link State Acknowledgment packet back out the | |
2136 | receiving | |
2137 | interface. */ | |
2138 | { | |
2139 | ospf_ls_ack_send(nbr, lsa); | |
2140 | DISCARD_LSA(lsa, 6); | |
2141 | } | |
2142 | } | |
2143 | ||
2144 | /* The database copy is more recent. If the database copy | |
2145 | has LS age equal to MaxAge and LS sequence number equal to | |
2146 | MaxSequenceNumber, simply discard the received LSA without | |
2147 | acknowledging it. (In this case, the LSA's LS sequence number | |
2148 | is | |
2149 | wrapping, and the MaxSequenceNumber LSA must be completely | |
2150 | flushed before any new LSA instance can be introduced). */ | |
2151 | ||
2152 | else if (ret > 0) /* Database copy is more recent */ | |
2153 | { | |
2154 | if (IS_LSA_MAXAGE(current) | |
2155 | && current->data->ls_seqnum | |
2156 | == htonl(OSPF_MAX_SEQUENCE_NUMBER)) { | |
2157 | DISCARD_LSA(lsa, 7); | |
2158 | } | |
2159 | /* Otherwise, as long as the database copy has not been | |
2160 | sent in a | |
2161 | Link State Update within the last MinLSArrival | |
2162 | seconds, send the | |
2163 | database copy back to the sending neighbor, | |
2164 | encapsulated within | |
2165 | a Link State Update Packet. The Link State Update | |
2166 | Packet should | |
2167 | be sent directly to the neighbor. In so doing, do not | |
2168 | put the | |
2169 | database copy of the LSA on the neighbor's link state | |
2170 | retransmission list, and do not acknowledge the | |
2171 | received (less | |
2172 | recent) LSA instance. */ | |
2173 | else { | |
2174 | if (monotime_since(¤t->tv_orig, NULL) | |
2175 | >= ospf->min_ls_arrival * 1000LL) | |
2176 | /* Trap NSSA type later.*/ | |
2177 | ospf_ls_upd_send_lsa( | |
2178 | nbr, current, | |
2179 | OSPF_SEND_PACKET_DIRECT); | |
2180 | DISCARD_LSA(lsa, 8); | |
2181 | } | |
2182 | } | |
2183 | } | |
2cd754de PJ |
2184 | #undef DISCARD_LSA |
2185 | ||
d62a17ae | 2186 | assert(listcount(lsas) == 0); |
affe9e99 | 2187 | list_delete_and_null(&lsas); |
718e3744 | 2188 | } |
2189 | ||
2190 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
d62a17ae | 2191 | static void ospf_ls_ack(struct ip *iph, struct ospf_header *ospfh, |
2192 | struct stream *s, struct ospf_interface *oi, | |
2193 | u_int16_t size) | |
2194 | { | |
2195 | struct ospf_neighbor *nbr; | |
2196 | ||
2197 | /* increment statistics. */ | |
2198 | oi->ls_ack_in++; | |
2199 | ||
2200 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
2201 | if (nbr == NULL) { | |
2202 | zlog_warn("Link State Acknowledgment: Unknown Neighbor %s.", | |
2203 | inet_ntoa(ospfh->router_id)); | |
2204 | return; | |
2205 | } | |
2206 | ||
2207 | /* Add event to thread. */ | |
2208 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
2209 | ||
2210 | if (nbr->state < NSM_Exchange) { | |
2211 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
2212 | zlog_debug( | |
2213 | "Link State Acknowledgment: " | |
2214 | "Neighbor[%s] state %s is less than Exchange", | |
2215 | inet_ntoa(ospfh->router_id), | |
2216 | lookup_msg(ospf_nsm_state_msg, nbr->state, | |
2217 | NULL)); | |
2218 | return; | |
2219 | } | |
2220 | ||
2221 | while (size >= OSPF_LSA_HEADER_SIZE) { | |
2222 | struct ospf_lsa *lsa, *lsr; | |
2223 | ||
2224 | lsa = ospf_lsa_new(); | |
2d34fb80 | 2225 | lsa->data = (struct lsa_header *)stream_pnt(s); |
b5a8894d | 2226 | lsa->vrf_id = oi->ospf->vrf_id; |
d62a17ae | 2227 | |
2d34fb80 | 2228 | /* lsah = (struct lsa_header *) stream_pnt (s); */ |
d62a17ae | 2229 | size -= OSPF_LSA_HEADER_SIZE; |
2230 | stream_forward_getp(s, OSPF_LSA_HEADER_SIZE); | |
2231 | ||
2232 | if (lsa->data->type < OSPF_MIN_LSA | |
2233 | || lsa->data->type >= OSPF_MAX_LSA) { | |
2234 | lsa->data = NULL; | |
2235 | ospf_lsa_discard(lsa); | |
2236 | continue; | |
2237 | } | |
2238 | ||
2239 | lsr = ospf_ls_retransmit_lookup(nbr, lsa); | |
2240 | ||
2241 | if (lsr != NULL && ospf_lsa_more_recent(lsr, lsa) == 0) | |
2242 | ospf_ls_retransmit_delete(nbr, lsr); | |
2243 | ||
2244 | lsa->data = NULL; | |
2245 | ospf_lsa_discard(lsa); | |
2246 | } | |
2247 | ||
2248 | return; | |
2249 | } | |
2250 | ||
b5a8894d CS |
2251 | static struct stream *ospf_recv_packet(struct ospf *ospf, int fd, |
2252 | struct interface **ifp, | |
d62a17ae | 2253 | struct stream *ibuf) |
2254 | { | |
2255 | int ret; | |
2256 | struct ip *iph; | |
2257 | u_int16_t ip_len; | |
2258 | ifindex_t ifindex = 0; | |
2259 | struct iovec iov; | |
2260 | /* Header and data both require alignment. */ | |
2261 | char buff[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; | |
2262 | struct msghdr msgh; | |
2263 | ||
2264 | memset(&msgh, 0, sizeof(struct msghdr)); | |
2265 | msgh.msg_iov = &iov; | |
2266 | msgh.msg_iovlen = 1; | |
2267 | msgh.msg_control = (caddr_t)buff; | |
2268 | msgh.msg_controllen = sizeof(buff); | |
2269 | ||
2270 | ret = stream_recvmsg(ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE + 1); | |
2271 | if (ret < 0) { | |
2272 | zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno)); | |
2273 | return NULL; | |
2274 | } | |
2275 | if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */ | |
718e3744 | 2276 | { |
d62a17ae | 2277 | zlog_warn( |
2278 | "ospf_recv_packet: discarding runt packet of length %d " | |
2279 | "(ip header size is %u)", | |
2280 | ret, (u_int)sizeof(iph)); | |
2281 | return NULL; | |
2282 | } | |
2283 | ||
2284 | /* Note that there should not be alignment problems with this assignment | |
2285 | because this is at the beginning of the stream data buffer. */ | |
2286 | iph = (struct ip *)STREAM_DATA(ibuf); | |
2287 | sockopt_iphdrincl_swab_systoh(iph); | |
2288 | ||
2289 | ip_len = iph->ip_len; | |
2290 | ||
de5ccb96 | 2291 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000) |
d62a17ae | 2292 | /* |
2293 | * Kernel network code touches incoming IP header parameters, | |
2294 | * before protocol specific processing. | |
2295 | * | |
2296 | * 1) Convert byteorder to host representation. | |
2297 | * --> ip_len, ip_id, ip_off | |
2298 | * | |
2299 | * 2) Adjust ip_len to strip IP header size! | |
2300 | * --> If user process receives entire IP packet via RAW | |
2301 | * socket, it must consider adding IP header size to | |
2302 | * the "ip_len" field of "ip" structure. | |
2303 | * | |
2304 | * For more details, see <netinet/ip_input.c>. | |
2305 | */ | |
2306 | ip_len = ip_len + (iph->ip_hl << 2); | |
718e3744 | 2307 | #endif |
d62a17ae | 2308 | |
0150c9c9 | 2309 | #if defined(__DragonFly__) |
d62a17ae | 2310 | /* |
2311 | * in DragonFly's raw socket, ip_len/ip_off are read | |
2312 | * in network byte order. | |
2313 | * As OpenBSD < 200311 adjust ip_len to strip IP header size! | |
2314 | */ | |
2315 | ip_len = ntohs(iph->ip_len) + (iph->ip_hl << 2); | |
0150c9c9 DB |
2316 | #endif |
2317 | ||
d62a17ae | 2318 | ifindex = getsockopt_ifindex(AF_INET, &msgh); |
2319 | ||
b5a8894d | 2320 | *ifp = if_lookup_by_index(ifindex, ospf->vrf_id); |
d62a17ae | 2321 | |
2322 | if (ret != ip_len) { | |
2323 | zlog_warn( | |
2324 | "ospf_recv_packet read length mismatch: ip_len is %d, " | |
2325 | "but recvmsg returned %d", | |
2326 | ip_len, ret); | |
2327 | return NULL; | |
2328 | } | |
718e3744 | 2329 | |
d62a17ae | 2330 | return ibuf; |
718e3744 | 2331 | } |
2332 | ||
4dadc291 | 2333 | static struct ospf_interface * |
d62a17ae | 2334 | ospf_associate_packet_vl(struct ospf *ospf, struct interface *ifp, |
2335 | struct ip *iph, struct ospf_header *ospfh) | |
2336 | { | |
2337 | struct ospf_interface *rcv_oi; | |
2338 | struct ospf_vl_data *vl_data; | |
2339 | struct ospf_area *vl_area; | |
2340 | struct listnode *node; | |
2341 | ||
2342 | if (IN_MULTICAST(ntohl(iph->ip_dst.s_addr)) | |
2343 | || !OSPF_IS_AREA_BACKBONE(ospfh)) | |
2344 | return NULL; | |
2345 | ||
2346 | /* look for local OSPF interface matching the destination | |
2347 | * to determine Area ID. We presume therefore the destination address | |
2348 | * is unique, or at least (for "unnumbered" links), not used in other | |
2349 | * areas | |
2350 | */ | |
2351 | if ((rcv_oi = ospf_if_lookup_by_local_addr(ospf, NULL, iph->ip_dst)) | |
2352 | == NULL) | |
2353 | return NULL; | |
2354 | ||
2355 | for (ALL_LIST_ELEMENTS_RO(ospf->vlinks, node, vl_data)) { | |
2356 | vl_area = | |
2357 | ospf_area_lookup_by_area_id(ospf, vl_data->vl_area_id); | |
2358 | if (!vl_area) | |
2359 | continue; | |
2360 | ||
2361 | if (OSPF_AREA_SAME(&vl_area, &rcv_oi->area) | |
2362 | && IPV4_ADDR_SAME(&vl_data->vl_peer, &ospfh->router_id)) { | |
2363 | if (IS_DEBUG_OSPF_EVENT) | |
2364 | zlog_debug("associating packet with %s", | |
2365 | IF_NAME(vl_data->vl_oi)); | |
2366 | if (!CHECK_FLAG(vl_data->vl_oi->ifp->flags, IFF_UP)) { | |
2367 | if (IS_DEBUG_OSPF_EVENT) | |
2368 | zlog_debug( | |
2369 | "This VL is not up yet, sorry"); | |
2370 | return NULL; | |
2371 | } | |
2372 | ||
2373 | return vl_data->vl_oi; | |
2374 | } | |
718e3744 | 2375 | } |
718e3744 | 2376 | |
d62a17ae | 2377 | if (IS_DEBUG_OSPF_EVENT) |
2378 | zlog_debug("couldn't find any VL to associate the packet with"); | |
2379 | ||
2380 | return NULL; | |
718e3744 | 2381 | } |
2382 | ||
d62a17ae | 2383 | static int ospf_check_area_id(struct ospf_interface *oi, |
2384 | struct ospf_header *ospfh) | |
718e3744 | 2385 | { |
d62a17ae | 2386 | /* Check match the Area ID of the receiving interface. */ |
2387 | if (OSPF_AREA_SAME(&oi->area, &ospfh)) | |
2388 | return 1; | |
718e3744 | 2389 | |
d62a17ae | 2390 | return 0; |
718e3744 | 2391 | } |
2392 | ||
2393 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2394 | To prevent it, compare src IP address and i/f address with masking | |
2395 | i/f network mask. */ | |
d62a17ae | 2396 | static int ospf_check_network_mask(struct ospf_interface *oi, |
2397 | struct in_addr ip_src) | |
718e3744 | 2398 | { |
d62a17ae | 2399 | struct in_addr mask, me, him; |
718e3744 | 2400 | |
d62a17ae | 2401 | if (oi->type == OSPF_IFTYPE_POINTOPOINT |
2402 | || oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2403 | return 1; | |
718e3744 | 2404 | |
d62a17ae | 2405 | masklen2ip(oi->address->prefixlen, &mask); |
718e3744 | 2406 | |
d62a17ae | 2407 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; |
2408 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
718e3744 | 2409 | |
d62a17ae | 2410 | if (IPV4_ADDR_SAME(&me, &him)) |
2411 | return 1; | |
718e3744 | 2412 | |
d62a17ae | 2413 | return 0; |
718e3744 | 2414 | } |
2415 | ||
bd5651f0 DO |
2416 | /* Return 1, if the packet is properly authenticated and checksummed, |
2417 | 0 otherwise. In particular, check that AuType header field is valid and | |
2418 | matches the locally configured AuType, and that D.5 requirements are met. */ | |
d62a17ae | 2419 | static int ospf_check_auth(struct ospf_interface *oi, struct ospf_header *ospfh) |
2420 | { | |
2421 | struct crypt_key *ck; | |
2422 | u_int16_t iface_auth_type; | |
2423 | u_int16_t pkt_auth_type = ntohs(ospfh->auth_type); | |
2424 | ||
2425 | switch (pkt_auth_type) { | |
2426 | case OSPF_AUTH_NULL: /* RFC2328 D.5.1 */ | |
2427 | if (OSPF_AUTH_NULL != (iface_auth_type = ospf_auth_type(oi))) { | |
2428 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2429 | zlog_warn( | |
2430 | "interface %s: auth-type mismatch, local %s, rcvd Null", | |
2431 | IF_NAME(oi), | |
2432 | lookup_msg(ospf_auth_type_str, | |
2433 | iface_auth_type, NULL)); | |
2434 | return 0; | |
2435 | } | |
2436 | if (!ospf_check_sum(ospfh)) { | |
2437 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2438 | zlog_warn( | |
2439 | "interface %s: Null auth OK, but checksum error, Router-ID %s", | |
2440 | IF_NAME(oi), | |
2441 | inet_ntoa(ospfh->router_id)); | |
2442 | return 0; | |
2443 | } | |
2444 | return 1; | |
2445 | case OSPF_AUTH_SIMPLE: /* RFC2328 D.5.2 */ | |
2446 | if (OSPF_AUTH_SIMPLE | |
2447 | != (iface_auth_type = ospf_auth_type(oi))) { | |
2448 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2449 | zlog_warn( | |
2450 | "interface %s: auth-type mismatch, local %s, rcvd Simple", | |
2451 | IF_NAME(oi), | |
2452 | lookup_msg(ospf_auth_type_str, | |
2453 | iface_auth_type, NULL)); | |
2454 | return 0; | |
2455 | } | |
2456 | if (memcmp(OSPF_IF_PARAM(oi, auth_simple), ospfh->u.auth_data, | |
2457 | OSPF_AUTH_SIMPLE_SIZE)) { | |
2458 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2459 | zlog_warn("interface %s: Simple auth failed", | |
2460 | IF_NAME(oi)); | |
2461 | return 0; | |
2462 | } | |
2463 | if (!ospf_check_sum(ospfh)) { | |
2464 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2465 | zlog_warn( | |
2466 | "interface %s: Simple auth OK, checksum error, Router-ID %s", | |
2467 | IF_NAME(oi), | |
2468 | inet_ntoa(ospfh->router_id)); | |
2469 | return 0; | |
2470 | } | |
2471 | return 1; | |
2472 | case OSPF_AUTH_CRYPTOGRAPHIC: /* RFC2328 D.5.3 */ | |
2473 | if (OSPF_AUTH_CRYPTOGRAPHIC | |
2474 | != (iface_auth_type = ospf_auth_type(oi))) { | |
2475 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2476 | zlog_warn( | |
2477 | "interface %s: auth-type mismatch, local %s, rcvd Cryptographic", | |
2478 | IF_NAME(oi), | |
2479 | lookup_msg(ospf_auth_type_str, | |
2480 | iface_auth_type, NULL)); | |
2481 | return 0; | |
2482 | } | |
2483 | if (ospfh->checksum) { | |
2484 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2485 | zlog_warn( | |
2486 | "interface %s: OSPF header checksum is not 0", | |
2487 | IF_NAME(oi)); | |
2488 | return 0; | |
2489 | } | |
2490 | /* only MD5 crypto method can pass ospf_packet_examin() */ | |
996c9314 LB |
2491 | if (NULL == (ck = listgetdata( |
2492 | listtail(OSPF_IF_PARAM(oi, auth_crypt)))) | |
2493 | || ospfh->u.crypt.key_id != ck->key_id || | |
2494 | /* Condition above uses the last key ID on the list, | |
2495 | which is | |
2496 | different from what ospf_crypt_key_lookup() does. A | |
2497 | bug? */ | |
2498 | !ospf_check_md5_digest(oi, ospfh)) { | |
d62a17ae | 2499 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) |
2500 | zlog_warn("interface %s: MD5 auth failed", | |
2501 | IF_NAME(oi)); | |
2502 | return 0; | |
2503 | } | |
2504 | return 1; | |
2505 | default: | |
2506 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2507 | zlog_warn( | |
2508 | "interface %s: invalid packet auth-type (%02x)", | |
2509 | IF_NAME(oi), pkt_auth_type); | |
2510 | return 0; | |
2511 | } | |
2512 | } | |
2513 | ||
2514 | static int ospf_check_sum(struct ospf_header *ospfh) | |
2515 | { | |
2516 | u_int32_t ret; | |
2517 | u_int16_t sum; | |
2518 | ||
2519 | /* clear auth_data for checksum. */ | |
2520 | memset(ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2521 | ||
2522 | /* keep checksum and clear. */ | |
2523 | sum = ospfh->checksum; | |
2524 | memset(&ospfh->checksum, 0, sizeof(u_int16_t)); | |
2525 | ||
2526 | /* calculate checksum. */ | |
2527 | ret = in_cksum(ospfh, ntohs(ospfh->length)); | |
2528 | ||
2529 | if (ret != sum) { | |
2530 | zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2531 | ret, sum); | |
2532 | return 0; | |
2533 | } | |
2534 | ||
2535 | return 1; | |
718e3744 | 2536 | } |
2537 | ||
4e31de79 DO |
2538 | /* Verify, that given link/TOS records are properly sized/aligned and match |
2539 | Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */ | |
d62a17ae | 2540 | static unsigned ospf_router_lsa_links_examin(struct router_lsa_link *link, |
2541 | u_int16_t linkbytes, | |
2542 | const u_int16_t num_links) | |
2543 | { | |
2544 | unsigned counted_links = 0, thislinklen; | |
2545 | ||
2546 | while (linkbytes) { | |
2547 | thislinklen = | |
2548 | OSPF_ROUTER_LSA_LINK_SIZE + 4 * link->m[0].tos_count; | |
2549 | if (thislinklen > linkbytes) { | |
2550 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2551 | zlog_debug("%s: length error in link block #%u", | |
2552 | __func__, counted_links); | |
2553 | return MSG_NG; | |
2554 | } | |
2555 | link = (struct router_lsa_link *)((caddr_t)link + thislinklen); | |
2556 | linkbytes -= thislinklen; | |
2557 | counted_links++; | |
2558 | } | |
2559 | if (counted_links != num_links) { | |
2560 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2561 | zlog_debug("%s: %u link blocks declared, %u present", | |
2562 | __func__, num_links, counted_links); | |
2563 | return MSG_NG; | |
2564 | } | |
2565 | return MSG_OK; | |
4e31de79 DO |
2566 | } |
2567 | ||
2568 | /* Verify, that the given LSA is properly sized/aligned (including type-specific | |
2569 | minimum length constraint). */ | |
d62a17ae | 2570 | static unsigned ospf_lsa_examin(struct lsa_header *lsah, const u_int16_t lsalen, |
2571 | const u_char headeronly) | |
2572 | { | |
2573 | unsigned ret; | |
2574 | struct router_lsa *rlsa; | |
2575 | if (lsah->type < OSPF_MAX_LSA && ospf_lsa_minlen[lsah->type] | |
2576 | && lsalen < OSPF_LSA_HEADER_SIZE + ospf_lsa_minlen[lsah->type]) { | |
2577 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2578 | zlog_debug("%s: undersized (%u B) %s", __func__, lsalen, | |
2579 | lookup_msg(ospf_lsa_type_msg, lsah->type, | |
2580 | NULL)); | |
2581 | return MSG_NG; | |
2582 | } | |
2583 | switch (lsah->type) { | |
2584 | case OSPF_ROUTER_LSA: | |
2585 | /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1 | |
2586 | * (12+)-byte link blocks */ | |
2587 | if (headeronly) { | |
2588 | ret = (lsalen - OSPF_LSA_HEADER_SIZE | |
2589 | - OSPF_ROUTER_LSA_MIN_SIZE) | |
2590 | % 4 | |
2591 | ? MSG_NG | |
2592 | : MSG_OK; | |
2593 | break; | |
2594 | } | |
2595 | rlsa = (struct router_lsa *)lsah; | |
2596 | ret = ospf_router_lsa_links_examin( | |
2597 | (struct router_lsa_link *)rlsa->link, | |
2598 | lsalen - OSPF_LSA_HEADER_SIZE - 4, /* skip: basic | |
2599 | header, "flags", | |
2600 | 0, "# links" */ | |
2601 | ntohs(rlsa->links) /* 16 bits */ | |
9d303b37 | 2602 | ); |
d62a17ae | 2603 | break; |
2604 | case OSPF_AS_EXTERNAL_LSA: | |
2605 | /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long | |
2606 | * blocks */ | |
2607 | case OSPF_AS_NSSA_LSA: | |
2608 | /* RFC3101 C, idem */ | |
2609 | ret = (lsalen - OSPF_LSA_HEADER_SIZE | |
2610 | - OSPF_AS_EXTERNAL_LSA_MIN_SIZE) | |
2611 | % 12 | |
2612 | ? MSG_NG | |
2613 | : MSG_OK; | |
2614 | break; | |
2615 | /* Following LSA types are considered OK length-wise as soon as their | |
2616 | * minimum | |
2617 | * length constraint is met and length of the whole LSA is a multiple of | |
2618 | * 4 | |
2619 | * (basic LSA header size is already a multiple of 4). */ | |
2620 | case OSPF_NETWORK_LSA: | |
2621 | /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */ | |
2622 | case OSPF_SUMMARY_LSA: | |
2623 | case OSPF_ASBR_SUMMARY_LSA: | |
2624 | /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS | |
2625 | * blocks */ | |
2626 | case OSPF_OPAQUE_LINK_LSA: | |
2627 | case OSPF_OPAQUE_AREA_LSA: | |
2628 | case OSPF_OPAQUE_AS_LSA: | |
2629 | /* RFC5250 A.2, "some number of octets (of application-specific | |
2630 | * data) padded to 32-bit alignment." This is considered | |
2631 | * equivalent | |
2632 | * to 4-byte alignment of all other LSA types, see | |
2633 | * OSPF-ALIGNMENT.txt | |
2634 | * file for the detailed analysis of this passage. */ | |
2635 | ret = lsalen % 4 ? MSG_NG : MSG_OK; | |
2636 | break; | |
2637 | default: | |
2638 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2639 | zlog_debug("%s: unsupported LSA type 0x%02x", __func__, | |
2640 | lsah->type); | |
2641 | return MSG_NG; | |
2642 | } | |
2643 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2644 | zlog_debug("%s: alignment error in %s", __func__, | |
2645 | lookup_msg(ospf_lsa_type_msg, lsah->type, NULL)); | |
2646 | return ret; | |
4e31de79 DO |
2647 | } |
2648 | ||
2649 | /* Verify if the provided input buffer is a valid sequence of LSAs. This | |
2650 | includes verification of LSA blocks length/alignment and dispatching | |
2651 | of deeper-level checks. */ | |
2652 | static unsigned | |
d62a17ae | 2653 | ospf_lsaseq_examin(struct lsa_header *lsah, /* start of buffered data */ |
2654 | size_t length, const u_char headeronly, | |
2655 | /* When declared_num_lsas is not 0, compare it to the real | |
2656 | number of LSAs | |
2657 | and treat the difference as an error. */ | |
2658 | const u_int32_t declared_num_lsas) | |
2659 | { | |
2660 | u_int32_t counted_lsas = 0; | |
2661 | ||
2662 | while (length) { | |
2663 | u_int16_t lsalen; | |
2664 | if (length < OSPF_LSA_HEADER_SIZE) { | |
2665 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2666 | zlog_debug( | |
2667 | "%s: undersized (%zu B) trailing (#%u) LSA header", | |
2668 | __func__, length, counted_lsas); | |
2669 | return MSG_NG; | |
2670 | } | |
2671 | /* save on ntohs() calls here and in the LSA validator */ | |
2672 | lsalen = ntohs(lsah->length); | |
2673 | if (lsalen < OSPF_LSA_HEADER_SIZE) { | |
2674 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2675 | zlog_debug( | |
2676 | "%s: malformed LSA header #%u, declared length is %u B", | |
2677 | __func__, counted_lsas, lsalen); | |
2678 | return MSG_NG; | |
2679 | } | |
2680 | if (headeronly) { | |
2681 | /* less checks here and in ospf_lsa_examin() */ | |
2682 | if (MSG_OK != ospf_lsa_examin(lsah, lsalen, 1)) { | |
2683 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2684 | zlog_debug( | |
2685 | "%s: malformed header-only LSA #%u", | |
2686 | __func__, counted_lsas); | |
2687 | return MSG_NG; | |
2688 | } | |
2689 | lsah = (struct lsa_header *)((caddr_t)lsah | |
2690 | + OSPF_LSA_HEADER_SIZE); | |
2691 | length -= OSPF_LSA_HEADER_SIZE; | |
2692 | } else { | |
2693 | /* make sure the input buffer is deep enough before | |
2694 | * further checks */ | |
2695 | if (lsalen > length) { | |
2696 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2697 | zlog_debug( | |
2698 | "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B", | |
2699 | __func__, counted_lsas, lsalen, | |
2700 | length); | |
2701 | return MSG_NG; | |
2702 | } | |
2703 | if (MSG_OK != ospf_lsa_examin(lsah, lsalen, 0)) { | |
2704 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2705 | zlog_debug("%s: malformed LSA #%u", | |
2706 | __func__, counted_lsas); | |
2707 | return MSG_NG; | |
2708 | } | |
2709 | lsah = (struct lsa_header *)((caddr_t)lsah + lsalen); | |
2710 | length -= lsalen; | |
2711 | } | |
2712 | counted_lsas++; | |
2713 | } | |
2714 | ||
2715 | if (declared_num_lsas && counted_lsas != declared_num_lsas) { | |
2716 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2717 | zlog_debug( | |
2718 | "%s: #LSAs declared (%u) does not match actual (%u)", | |
2719 | __func__, declared_num_lsas, counted_lsas); | |
2720 | return MSG_NG; | |
2721 | } | |
2722 | return MSG_OK; | |
4e31de79 DO |
2723 | } |
2724 | ||
75c8eabb | 2725 | /* Verify a complete OSPF packet for proper sizing/alignment. */ |
d62a17ae | 2726 | static unsigned ospf_packet_examin(struct ospf_header *oh, |
2727 | const unsigned bytesonwire) | |
2728 | { | |
2729 | u_int16_t bytesdeclared, bytesauth; | |
2730 | unsigned ret; | |
2731 | struct ospf_ls_update *lsupd; | |
2732 | ||
2733 | /* Length, 1st approximation. */ | |
2734 | if (bytesonwire < OSPF_HEADER_SIZE) { | |
2735 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2736 | zlog_debug("%s: undersized (%u B) packet", __func__, | |
2737 | bytesonwire); | |
2738 | return MSG_NG; | |
2739 | } | |
2740 | /* Now it is safe to access header fields. Performing length check, | |
2741 | * allow | |
2742 | * for possible extra bytes of crypto auth/padding, which are not | |
2743 | * counted | |
2744 | * in the OSPF header "length" field. */ | |
2745 | if (oh->version != OSPF_VERSION) { | |
2746 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2747 | zlog_debug("%s: invalid (%u) protocol version", | |
2748 | __func__, oh->version); | |
2749 | return MSG_NG; | |
2750 | } | |
2751 | bytesdeclared = ntohs(oh->length); | |
2752 | if (ntohs(oh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2753 | bytesauth = 0; | |
2754 | else { | |
2755 | if (oh->u.crypt.auth_data_len != OSPF_AUTH_MD5_SIZE) { | |
2756 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2757 | zlog_debug( | |
2758 | "%s: unsupported crypto auth length (%u B)", | |
2759 | __func__, oh->u.crypt.auth_data_len); | |
2760 | return MSG_NG; | |
2761 | } | |
2762 | bytesauth = OSPF_AUTH_MD5_SIZE; | |
2763 | } | |
2764 | if (bytesdeclared + bytesauth > bytesonwire) { | |
2765 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2766 | zlog_debug( | |
2767 | "%s: packet length error (%u real, %u+%u declared)", | |
2768 | __func__, bytesonwire, bytesdeclared, | |
2769 | bytesauth); | |
2770 | return MSG_NG; | |
2771 | } | |
2772 | /* Length, 2nd approximation. The type-specific constraint is checked | |
2773 | against declared length, not amount of bytes on wire. */ | |
2774 | if (oh->type >= OSPF_MSG_HELLO && oh->type <= OSPF_MSG_LS_ACK | |
2775 | && bytesdeclared | |
2776 | < OSPF_HEADER_SIZE + ospf_packet_minlen[oh->type]) { | |
2777 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2778 | zlog_debug("%s: undersized (%u B) %s packet", __func__, | |
2779 | bytesdeclared, | |
2780 | lookup_msg(ospf_packet_type_str, oh->type, | |
2781 | NULL)); | |
2782 | return MSG_NG; | |
2783 | } | |
2784 | switch (oh->type) { | |
2785 | case OSPF_MSG_HELLO: | |
2786 | /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes | |
2787 | followed | |
2788 | by N>=0 router-IDs. */ | |
2789 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_HELLO_MIN_SIZE) | |
2790 | % 4 | |
2791 | ? MSG_NG | |
2792 | : MSG_OK; | |
2793 | break; | |
2794 | case OSPF_MSG_DB_DESC: | |
2795 | /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes | |
2796 | followed | |
2797 | by N>=0 header-only LSAs. */ | |
2798 | ret = ospf_lsaseq_examin( | |
2799 | (struct lsa_header *)((caddr_t)oh + OSPF_HEADER_SIZE | |
2800 | + OSPF_DB_DESC_MIN_SIZE), | |
2801 | bytesdeclared - OSPF_HEADER_SIZE | |
2802 | - OSPF_DB_DESC_MIN_SIZE, | |
2803 | 1, /* header-only LSAs */ | |
2804 | 0); | |
2805 | break; | |
2806 | case OSPF_MSG_LS_REQ: | |
2807 | /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes | |
2808 | * request blocks. */ | |
2809 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_REQ_MIN_SIZE) | |
2810 | % OSPF_LSA_KEY_SIZE | |
2811 | ? MSG_NG | |
2812 | : MSG_OK; | |
2813 | break; | |
2814 | case OSPF_MSG_LS_UPD: | |
2815 | /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes | |
2816 | followed | |
2817 | by N>=0 full LSAs (with N declared beforehand). */ | |
2818 | lsupd = (struct ospf_ls_update *)((caddr_t)oh | |
2819 | + OSPF_HEADER_SIZE); | |
2820 | ret = ospf_lsaseq_examin( | |
2821 | (struct lsa_header *)((caddr_t)lsupd | |
2822 | + OSPF_LS_UPD_MIN_SIZE), | |
2823 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_UPD_MIN_SIZE, | |
2824 | 0, /* full LSAs */ | |
2825 | ntohl(lsupd->num_lsas) /* 32 bits */ | |
9d303b37 | 2826 | ); |
d62a17ae | 2827 | break; |
2828 | case OSPF_MSG_LS_ACK: | |
2829 | /* RFC2328 A.3.6, packet header followed by N>=0 header-only | |
2830 | * LSAs. */ | |
2831 | ret = ospf_lsaseq_examin( | |
2832 | (struct lsa_header *)((caddr_t)oh + OSPF_HEADER_SIZE | |
2833 | + OSPF_LS_ACK_MIN_SIZE), | |
2834 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_ACK_MIN_SIZE, | |
2835 | 1, /* header-only LSAs */ | |
2836 | 0); | |
2837 | break; | |
2838 | default: | |
2839 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2840 | zlog_debug("%s: invalid packet type 0x%02x", __func__, | |
2841 | oh->type); | |
2842 | return MSG_NG; | |
2843 | } | |
2844 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2845 | zlog_debug("%s: malformed %s packet", __func__, | |
2846 | lookup_msg(ospf_packet_type_str, oh->type, NULL)); | |
2847 | return ret; | |
75c8eabb DO |
2848 | } |
2849 | ||
718e3744 | 2850 | /* OSPF Header verification. */ |
d62a17ae | 2851 | static int ospf_verify_header(struct stream *ibuf, struct ospf_interface *oi, |
2852 | struct ip *iph, struct ospf_header *ospfh) | |
2853 | { | |
2854 | /* Check Area ID. */ | |
2855 | if (!ospf_check_area_id(oi, ospfh)) { | |
2856 | zlog_warn("interface %s: ospf_read invalid Area ID %s.", | |
2857 | IF_NAME(oi), inet_ntoa(ospfh->area_id)); | |
2858 | return -1; | |
2859 | } | |
718e3744 | 2860 | |
d62a17ae | 2861 | /* Check network mask, Silently discarded. */ |
2862 | if (!ospf_check_network_mask(oi, iph->ip_src)) { | |
2863 | zlog_warn( | |
2864 | "interface %s: ospf_read network address is not same [%s]", | |
2865 | IF_NAME(oi), inet_ntoa(iph->ip_src)); | |
2866 | return -1; | |
2867 | } | |
718e3744 | 2868 | |
d62a17ae | 2869 | /* Check authentication. The function handles logging actions, where |
2870 | * required. */ | |
2871 | if (!ospf_check_auth(oi, ospfh)) | |
2872 | return -1; | |
718e3744 | 2873 | |
d62a17ae | 2874 | return 0; |
718e3744 | 2875 | } |
2876 | ||
2877 | /* Starting point of packet process function. */ | |
d62a17ae | 2878 | int ospf_read(struct thread *thread) |
2879 | { | |
2880 | int ret; | |
2881 | struct stream *ibuf; | |
2882 | struct ospf *ospf; | |
2883 | struct ospf_interface *oi; | |
2884 | struct ip *iph; | |
2885 | struct ospf_header *ospfh; | |
2886 | u_int16_t length; | |
b5a8894d | 2887 | struct interface *ifp = NULL; |
d62a17ae | 2888 | struct connected *c; |
2889 | ||
2890 | /* first of all get interface pointer. */ | |
2891 | ospf = THREAD_ARG(thread); | |
2892 | ||
2893 | /* prepare for next packet. */ | |
2894 | ospf->t_read = NULL; | |
2895 | thread_add_read(master, ospf_read, ospf, ospf->fd, &ospf->t_read); | |
2896 | ||
2897 | stream_reset(ospf->ibuf); | |
b5a8894d CS |
2898 | ibuf = ospf_recv_packet(ospf, ospf->fd, &ifp, ospf->ibuf); |
2899 | if (ibuf == NULL) | |
d62a17ae | 2900 | return -1; |
2901 | /* This raw packet is known to be at least as big as its IP header. */ | |
2902 | ||
2903 | /* Note that there should not be alignment problems with this assignment | |
2904 | because this is at the beginning of the stream data buffer. */ | |
2905 | iph = (struct ip *)STREAM_DATA(ibuf); | |
2906 | /* Note that sockopt_iphdrincl_swab_systoh was called in | |
2907 | * ospf_recv_packet. */ | |
2908 | ||
2909 | if (ifp == NULL) { | |
2910 | /* Handle cases where the platform does not support retrieving | |
2911 | the ifindex, | |
2912 | and also platforms (such as Solaris 8) that claim to support | |
2913 | ifindex | |
2914 | retrieval but do not. */ | |
2915 | c = if_lookup_address((void *)&iph->ip_src, AF_INET, | |
b5a8894d | 2916 | ospf->vrf_id); |
d62a17ae | 2917 | if (c) |
2918 | ifp = c->ifp; | |
2919 | if (ifp == NULL) | |
2920 | return 0; | |
2921 | } | |
2922 | ||
2923 | /* IP Header dump. */ | |
2924 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2925 | ospf_ip_header_dump(iph); | |
2926 | ||
2927 | /* Self-originated packet should be discarded silently. */ | |
2928 | if (ospf_if_lookup_by_local_addr(ospf, NULL, iph->ip_src)) { | |
2929 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) { | |
2930 | zlog_debug( | |
2931 | "ospf_read[%s]: Dropping self-originated packet", | |
2932 | inet_ntoa(iph->ip_src)); | |
2933 | } | |
2934 | return 0; | |
2935 | } | |
2936 | ||
2937 | /* Advance from IP header to OSPF header (iph->ip_hl has been verified | |
2938 | by ospf_recv_packet() to be correct). */ | |
2939 | stream_forward_getp(ibuf, iph->ip_hl * 4); | |
2940 | ||
2d34fb80 | 2941 | ospfh = (struct ospf_header *)stream_pnt(ibuf); |
d62a17ae | 2942 | if (MSG_OK |
9d303b37 DL |
2943 | != ospf_packet_examin( |
2944 | ospfh, stream_get_endp(ibuf) - stream_get_getp(ibuf))) | |
d62a17ae | 2945 | return -1; |
2946 | /* Now it is safe to access all fields of OSPF packet header. */ | |
2947 | ||
2948 | /* associate packet with ospf interface */ | |
2949 | oi = ospf_if_lookup_recv_if(ospf, iph->ip_src, ifp); | |
2950 | ||
2951 | /* ospf_verify_header() relies on a valid "oi" and thus can be called | |
2952 | only | |
2953 | after the passive/backbone/other checks below are passed. These | |
2954 | checks | |
2955 | in turn access the fields of unverified "ospfh" structure for their | |
2956 | own | |
2957 | purposes and must remain very accurate in doing this. */ | |
2958 | ||
2959 | /* If incoming interface is passive one, ignore it. */ | |
2960 | if (oi && OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) { | |
2961 | char buf[3][INET_ADDRSTRLEN]; | |
2962 | ||
2963 | if (IS_DEBUG_OSPF_EVENT) | |
2964 | zlog_debug( | |
2965 | "ignoring packet from router %s sent to %s, " | |
2966 | "received on a passive interface, %s", | |
2967 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], | |
2968 | sizeof(buf[0])), | |
2969 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], | |
2970 | sizeof(buf[1])), | |
2971 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
2972 | buf[2], sizeof(buf[2]))); | |
2973 | ||
2974 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) { | |
2975 | /* Try to fix multicast membership. | |
2976 | * Some OS:es may have problems in this area, | |
2977 | * make sure it is removed. | |
2978 | */ | |
2979 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
2980 | ospf_if_set_multicast(oi); | |
2981 | } | |
2982 | return 0; | |
2983 | } | |
2984 | ||
2985 | ||
2986 | /* if no local ospf_interface, | |
2987 | * or header area is backbone but ospf_interface is not | |
2988 | * check for VLINK interface | |
2989 | */ | |
9d303b37 DL |
2990 | if ((oi == NULL) || (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) |
2991 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id))) { | |
d62a17ae | 2992 | if ((oi = ospf_associate_packet_vl(ospf, ifp, iph, ospfh)) |
2993 | == NULL) { | |
2994 | if (!ospf->instance && IS_DEBUG_OSPF_EVENT) | |
2995 | zlog_debug( | |
2996 | "Packet from [%s] received on link %s" | |
2997 | " but no ospf_interface", | |
2998 | inet_ntoa(iph->ip_src), ifp->name); | |
2999 | return 0; | |
3000 | } | |
3001 | } | |
3002 | ||
3003 | /* else it must be a local ospf interface, check it was received on | |
3004 | * correct link | |
3005 | */ | |
3006 | else if (oi->ifp != ifp) { | |
3007 | if (IS_DEBUG_OSPF_EVENT) | |
3008 | zlog_warn("Packet from [%s] received on wrong link %s", | |
3009 | inet_ntoa(iph->ip_src), ifp->name); | |
3010 | return 0; | |
3011 | } else if (oi->state == ISM_Down) { | |
3012 | char buf[2][INET_ADDRSTRLEN]; | |
3013 | zlog_warn( | |
3014 | "Ignoring packet from %s to %s received on interface that is " | |
3015 | "down [%s]; interface flags are %s", | |
3016 | inet_ntop(AF_INET, &iph->ip_src, buf[0], | |
3017 | sizeof(buf[0])), | |
3018 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], | |
3019 | sizeof(buf[1])), | |
3020 | ifp->name, if_flag_dump(ifp->flags)); | |
3021 | /* Fix multicast memberships? */ | |
3022 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
3023 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
3024 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) | |
3025 | OI_MEMBER_JOINED(oi, MEMBER_DROUTERS); | |
3026 | if (oi->multicast_memberships) | |
3027 | ospf_if_set_multicast(oi); | |
3028 | return 0; | |
3029 | } | |
3030 | ||
3031 | /* | |
3032 | * If the received packet is destined for AllDRouters, the packet | |
3033 | * should be accepted only if the received ospf interface state is | |
3034 | * either DR or Backup -- endo. | |
3035 | */ | |
3036 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS) | |
3037 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) { | |
3038 | zlog_warn( | |
3039 | "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", | |
3040 | inet_ntoa(iph->ip_src), IF_NAME(oi), | |
3041 | lookup_msg(ospf_ism_state_msg, oi->state, NULL)); | |
3042 | /* Try to fix multicast membership. */ | |
3043 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
3044 | ospf_if_set_multicast(oi); | |
3045 | return 0; | |
3046 | } | |
3047 | ||
3048 | /* Verify more OSPF header fields. */ | |
3049 | ret = ospf_verify_header(ibuf, oi, iph, ospfh); | |
3050 | if (ret < 0) { | |
3051 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
3052 | zlog_debug( | |
3053 | "ospf_read[%s]: Header check failed, " | |
3054 | "dropping.", | |
3055 | inet_ntoa(iph->ip_src)); | |
3056 | return ret; | |
3057 | } | |
3058 | ||
3059 | /* Show debug receiving packet. */ | |
3060 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) { | |
3061 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, DETAIL)) { | |
3062 | zlog_debug( | |
3063 | "-----------------------------------------------------"); | |
3064 | ospf_packet_dump(ibuf); | |
3065 | } | |
3066 | ||
3067 | zlog_debug("%s received from [%s] via [%s]", | |
3068 | lookup_msg(ospf_packet_type_str, ospfh->type, NULL), | |
3069 | inet_ntoa(ospfh->router_id), IF_NAME(oi)); | |
3070 | zlog_debug(" src [%s],", inet_ntoa(iph->ip_src)); | |
3071 | zlog_debug(" dst [%s]", inet_ntoa(iph->ip_dst)); | |
3072 | ||
3073 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, DETAIL)) | |
3074 | zlog_debug( | |
3075 | "-----------------------------------------------------"); | |
3076 | } | |
3077 | ||
3078 | stream_forward_getp(ibuf, OSPF_HEADER_SIZE); | |
3079 | ||
3080 | /* Adjust size to message length. */ | |
3081 | length = ntohs(ospfh->length) - OSPF_HEADER_SIZE; | |
3082 | ||
3083 | /* Read rest of the packet and call each sort of packet routine. */ | |
3084 | switch (ospfh->type) { | |
3085 | case OSPF_MSG_HELLO: | |
3086 | ospf_hello(iph, ospfh, ibuf, oi, length); | |
3087 | break; | |
3088 | case OSPF_MSG_DB_DESC: | |
3089 | ospf_db_desc(iph, ospfh, ibuf, oi, length); | |
3090 | break; | |
3091 | case OSPF_MSG_LS_REQ: | |
3092 | ospf_ls_req(iph, ospfh, ibuf, oi, length); | |
3093 | break; | |
3094 | case OSPF_MSG_LS_UPD: | |
3095 | ospf_ls_upd(ospf, iph, ospfh, ibuf, oi, length); | |
3096 | break; | |
3097 | case OSPF_MSG_LS_ACK: | |
3098 | ospf_ls_ack(iph, ospfh, ibuf, oi, length); | |
3099 | break; | |
3100 | default: | |
3101 | zlog_warn("interface %s: OSPF packet header type %d is illegal", | |
3102 | IF_NAME(oi), ospfh->type); | |
3103 | break; | |
3104 | } | |
3105 | ||
b10ce841 | 3106 | return 0; |
718e3744 | 3107 | } |
3108 | ||
3109 | /* Make OSPF header. */ | |
d62a17ae | 3110 | static void ospf_make_header(int type, struct ospf_interface *oi, |
3111 | struct stream *s) | |
718e3744 | 3112 | { |
d62a17ae | 3113 | struct ospf_header *ospfh; |
718e3744 | 3114 | |
d62a17ae | 3115 | ospfh = (struct ospf_header *)STREAM_DATA(s); |
718e3744 | 3116 | |
d62a17ae | 3117 | ospfh->version = (u_char)OSPF_VERSION; |
3118 | ospfh->type = (u_char)type; | |
718e3744 | 3119 | |
d62a17ae | 3120 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 3121 | |
d62a17ae | 3122 | ospfh->checksum = 0; |
3123 | ospfh->area_id = oi->area->area_id; | |
3124 | ospfh->auth_type = htons(ospf_auth_type(oi)); | |
718e3744 | 3125 | |
d62a17ae | 3126 | memset(ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); |
718e3744 | 3127 | |
d62a17ae | 3128 | stream_forward_endp(s, OSPF_HEADER_SIZE); |
718e3744 | 3129 | } |
3130 | ||
3131 | /* Make Authentication Data. */ | |
d62a17ae | 3132 | static int ospf_make_auth(struct ospf_interface *oi, struct ospf_header *ospfh) |
3133 | { | |
3134 | struct crypt_key *ck; | |
3135 | ||
3136 | switch (ospf_auth_type(oi)) { | |
3137 | case OSPF_AUTH_NULL: | |
3138 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); | |
3139 | */ | |
3140 | break; | |
3141 | case OSPF_AUTH_SIMPLE: | |
3142 | memcpy(ospfh->u.auth_data, OSPF_IF_PARAM(oi, auth_simple), | |
3143 | OSPF_AUTH_SIMPLE_SIZE); | |
3144 | break; | |
3145 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
3146 | /* If key is not set, then set 0. */ | |
3147 | if (list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) { | |
3148 | ospfh->u.crypt.zero = 0; | |
3149 | ospfh->u.crypt.key_id = 0; | |
3150 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3151 | } else { | |
3152 | ck = listgetdata( | |
3153 | listtail(OSPF_IF_PARAM(oi, auth_crypt))); | |
3154 | ospfh->u.crypt.zero = 0; | |
3155 | ospfh->u.crypt.key_id = ck->key_id; | |
3156 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3157 | } | |
3158 | /* note: the seq is done in ospf_make_md5_digest() */ | |
3159 | break; | |
3160 | default: | |
3161 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); | |
3162 | */ | |
3163 | break; | |
718e3744 | 3164 | } |
718e3744 | 3165 | |
d62a17ae | 3166 | return 0; |
718e3744 | 3167 | } |
3168 | ||
3169 | /* Fill rest of OSPF header. */ | |
d62a17ae | 3170 | static void ospf_fill_header(struct ospf_interface *oi, struct stream *s, |
3171 | u_int16_t length) | |
3172 | { | |
3173 | struct ospf_header *ospfh; | |
3174 | ||
3175 | ospfh = (struct ospf_header *)STREAM_DATA(s); | |
3176 | ||
3177 | /* Fill length. */ | |
3178 | ospfh->length = htons(length); | |
3179 | ||
3180 | /* Calculate checksum. */ | |
3181 | if (ntohs(ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
3182 | ospfh->checksum = in_cksum(ospfh, length); | |
3183 | else | |
3184 | ospfh->checksum = 0; | |
3185 | ||
3186 | /* Add Authentication Data. */ | |
3187 | ospf_make_auth(oi, ospfh); | |
3188 | } | |
3189 | ||
3190 | static int ospf_make_hello(struct ospf_interface *oi, struct stream *s) | |
3191 | { | |
3192 | struct ospf_neighbor *nbr; | |
3193 | struct route_node *rn; | |
3194 | u_int16_t length = OSPF_HELLO_MIN_SIZE; | |
3195 | struct in_addr mask; | |
3196 | unsigned long p; | |
3197 | int flag = 0; | |
3198 | ||
3199 | /* Set netmask of interface. */ | |
3200 | if (!(CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED) | |
3201 | && oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3202 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
3203 | masklen2ip(oi->address->prefixlen, &mask); | |
3204 | else | |
3205 | memset((char *)&mask, 0, sizeof(struct in_addr)); | |
3206 | stream_put_ipv4(s, mask.s_addr); | |
3207 | ||
3208 | /* Set Hello Interval. */ | |
3209 | if (OSPF_IF_PARAM(oi, fast_hello) == 0) | |
3210 | stream_putw(s, OSPF_IF_PARAM(oi, v_hello)); | |
3211 | else | |
3212 | stream_putw(s, 0); /* hello-interval of 0 for fast-hellos */ | |
3213 | ||
3214 | if (IS_DEBUG_OSPF_EVENT) | |
3215 | zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi), | |
3216 | IF_NAME(oi)); | |
3217 | ||
3218 | /* Set Options. */ | |
3219 | stream_putc(s, OPTIONS(oi)); | |
3220 | ||
3221 | /* Set Router Priority. */ | |
3222 | stream_putc(s, PRIORITY(oi)); | |
3223 | ||
3224 | /* Set Router Dead Interval. */ | |
3225 | stream_putl(s, OSPF_IF_PARAM(oi, v_wait)); | |
3226 | ||
3227 | /* Set Designated Router. */ | |
3228 | stream_put_ipv4(s, DR(oi).s_addr); | |
3229 | ||
3230 | p = stream_get_endp(s); | |
3231 | ||
3232 | /* Set Backup Designated Router. */ | |
3233 | stream_put_ipv4(s, BDR(oi).s_addr); | |
3234 | ||
3235 | /* Add neighbor seen. */ | |
3236 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3237 | if ((nbr = rn->info)) | |
3238 | if (nbr->router_id.s_addr | |
3239 | != 0) /* Ignore 0.0.0.0 node. */ | |
3240 | if (nbr->state | |
3241 | != NSM_Attempt) /* Ignore Down neighbor. */ | |
3242 | if (nbr->state | |
3243 | != NSM_Down) /* This is myself for | |
3244 | DR election. */ | |
3245 | if (!IPV4_ADDR_SAME( | |
3246 | &nbr->router_id, | |
3247 | &oi->ospf->router_id)) { | |
3248 | /* Check neighbor is | |
3249 | * sane? */ | |
3250 | if (nbr->d_router.s_addr | |
3251 | != 0 | |
3252 | && IPV4_ADDR_SAME( | |
3253 | &nbr->d_router, | |
3254 | &oi->address | |
3255 | ->u | |
3256 | .prefix4) | |
3257 | && IPV4_ADDR_SAME( | |
3258 | &nbr->bd_router, | |
3259 | &oi->address | |
3260 | ->u | |
3261 | .prefix4)) | |
3262 | flag = 1; | |
3263 | ||
3264 | stream_put_ipv4( | |
3265 | s, | |
3266 | nbr->router_id | |
3267 | .s_addr); | |
3268 | length += 4; | |
3269 | } | |
3270 | ||
3271 | /* Let neighbor generate BackupSeen. */ | |
3272 | if (flag == 1) | |
3273 | stream_putl_at(s, p, 0); /* ipv4 address, normally */ | |
3274 | ||
3275 | return length; | |
3276 | } | |
3277 | ||
3278 | static int ospf_make_db_desc(struct ospf_interface *oi, | |
3279 | struct ospf_neighbor *nbr, struct stream *s) | |
3280 | { | |
3281 | struct ospf_lsa *lsa; | |
3282 | u_int16_t length = OSPF_DB_DESC_MIN_SIZE; | |
3283 | u_char options; | |
3284 | unsigned long pp; | |
3285 | int i; | |
3286 | struct ospf_lsdb *lsdb; | |
3287 | ||
3288 | /* Set Interface MTU. */ | |
3289 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3290 | stream_putw(s, 0); | |
3291 | else | |
3292 | stream_putw(s, oi->ifp->mtu); | |
3293 | ||
3294 | /* Set Options. */ | |
3295 | options = OPTIONS(oi); | |
3296 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) | |
3297 | SET_FLAG(options, OSPF_OPTION_O); | |
3298 | stream_putc(s, options); | |
3299 | ||
3300 | /* DD flags */ | |
3301 | pp = stream_get_endp(s); | |
3302 | stream_putc(s, nbr->dd_flags); | |
3303 | ||
3304 | /* Set DD Sequence Number. */ | |
3305 | stream_putl(s, nbr->dd_seqnum); | |
3306 | ||
3307 | /* shortcut unneeded walk of (empty) summary LSDBs */ | |
3308 | if (ospf_db_summary_isempty(nbr)) | |
3309 | goto empty; | |
3310 | ||
3311 | /* Describe LSA Header from Database Summary List. */ | |
3312 | lsdb = &nbr->db_sum; | |
3313 | ||
3314 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { | |
3315 | struct route_table *table = lsdb->type[i].db; | |
3316 | struct route_node *rn; | |
3317 | ||
3318 | for (rn = route_top(table); rn; rn = route_next(rn)) | |
3319 | if ((lsa = rn->info) != NULL) { | |
3320 | if (IS_OPAQUE_LSA(lsa->data->type) | |
3321 | && (!CHECK_FLAG(options, OSPF_OPTION_O))) { | |
3322 | /* Suppress advertising | |
3323 | * opaque-informations. */ | |
3324 | /* Remove LSA from DB summary list. */ | |
3325 | ospf_lsdb_delete(lsdb, lsa); | |
3326 | continue; | |
3327 | } | |
3328 | ||
3329 | if (!CHECK_FLAG(lsa->flags, OSPF_LSA_DISCARD)) { | |
3330 | struct lsa_header *lsah; | |
3331 | u_int16_t ls_age; | |
3332 | ||
3333 | /* DD packet overflows interface MTU. */ | |
3334 | if (length + OSPF_LSA_HEADER_SIZE | |
3335 | > ospf_packet_max(oi)) | |
3336 | break; | |
3337 | ||
3338 | /* Keep pointer to LS age. */ | |
3339 | lsah = (struct lsa_header | |
3340 | *)(STREAM_DATA(s) | |
3341 | + stream_get_endp( | |
3342 | s)); | |
3343 | ||
3344 | /* Proceed stream pointer. */ | |
3345 | stream_put(s, lsa->data, | |
3346 | OSPF_LSA_HEADER_SIZE); | |
3347 | length += OSPF_LSA_HEADER_SIZE; | |
3348 | ||
3349 | /* Set LS age. */ | |
3350 | ls_age = LS_AGE(lsa); | |
3351 | lsah->ls_age = htons(ls_age); | |
3352 | } | |
3353 | ||
3354 | /* Remove LSA from DB summary list. */ | |
3355 | ospf_lsdb_delete(lsdb, lsa); | |
3356 | } | |
3357 | } | |
718e3744 | 3358 | |
d62a17ae | 3359 | /* Update 'More' bit */ |
3360 | if (ospf_db_summary_isempty(nbr)) { | |
3361 | empty: | |
3362 | if (nbr->state >= NSM_Exchange) { | |
3363 | UNSET_FLAG(nbr->dd_flags, OSPF_DD_FLAG_M); | |
3364 | /* Rewrite DD flags */ | |
3365 | stream_putc_at(s, pp, nbr->dd_flags); | |
3366 | } else { | |
3367 | assert(IS_SET_DD_M(nbr->dd_flags)); | |
3368 | } | |
3369 | } | |
3370 | return length; | |
3371 | } | |
86f1fd96 | 3372 | |
d62a17ae | 3373 | static int ospf_make_ls_req_func(struct stream *s, u_int16_t *length, |
3374 | unsigned long delta, struct ospf_neighbor *nbr, | |
3375 | struct ospf_lsa *lsa) | |
3376 | { | |
3377 | struct ospf_interface *oi; | |
718e3744 | 3378 | |
d62a17ae | 3379 | oi = nbr->oi; |
718e3744 | 3380 | |
d62a17ae | 3381 | /* LS Request packet overflows interface MTU. */ |
3382 | if (*length + delta > ospf_packet_max(oi)) | |
3383 | return 0; | |
1eb8ef25 | 3384 | |
d62a17ae | 3385 | stream_putl(s, lsa->data->type); |
3386 | stream_put_ipv4(s, lsa->data->id.s_addr); | |
3387 | stream_put_ipv4(s, lsa->data->adv_router.s_addr); | |
718e3744 | 3388 | |
d62a17ae | 3389 | ospf_lsa_unlock(&nbr->ls_req_last); |
3390 | nbr->ls_req_last = ospf_lsa_lock(lsa); | |
59ea14c6 | 3391 | |
d62a17ae | 3392 | *length += 12; |
3393 | return 1; | |
3394 | } | |
718e3744 | 3395 | |
d62a17ae | 3396 | static int ospf_make_ls_req(struct ospf_neighbor *nbr, struct stream *s) |
3397 | { | |
3398 | struct ospf_lsa *lsa; | |
3399 | u_int16_t length = OSPF_LS_REQ_MIN_SIZE; | |
3400 | unsigned long delta = stream_get_endp(s) + 12; | |
3401 | struct route_table *table; | |
3402 | struct route_node *rn; | |
3403 | int i; | |
3404 | struct ospf_lsdb *lsdb; | |
718e3744 | 3405 | |
d62a17ae | 3406 | lsdb = &nbr->ls_req; |
718e3744 | 3407 | |
d62a17ae | 3408 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { |
3409 | table = lsdb->type[i].db; | |
3410 | for (rn = route_top(table); rn; rn = route_next(rn)) | |
3411 | if ((lsa = (rn->info)) != NULL) | |
3412 | if (ospf_make_ls_req_func(s, &length, delta, | |
3413 | nbr, lsa) | |
3414 | == 0) { | |
3415 | route_unlock_node(rn); | |
3416 | break; | |
3417 | } | |
3418 | } | |
3419 | return length; | |
3420 | } | |
718e3744 | 3421 | |
d62a17ae | 3422 | static int ls_age_increment(struct ospf_lsa *lsa, int delay) |
3423 | { | |
3424 | int age; | |
718e3744 | 3425 | |
d62a17ae | 3426 | age = IS_LSA_MAXAGE(lsa) ? OSPF_LSA_MAXAGE : LS_AGE(lsa) + delay; |
718e3744 | 3427 | |
d62a17ae | 3428 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); |
718e3744 | 3429 | } |
3430 | ||
d62a17ae | 3431 | static int ospf_make_ls_upd(struct ospf_interface *oi, struct list *update, |
3432 | struct stream *s) | |
718e3744 | 3433 | { |
d62a17ae | 3434 | struct ospf_lsa *lsa; |
3435 | struct listnode *node; | |
3436 | u_int16_t length = 0; | |
3437 | unsigned int size_noauth; | |
3438 | unsigned long delta = stream_get_endp(s); | |
3439 | unsigned long pp; | |
3440 | int count = 0; | |
3441 | ||
3442 | if (IS_DEBUG_OSPF_EVENT) | |
3443 | zlog_debug("ospf_make_ls_upd: Start"); | |
3444 | ||
3445 | pp = stream_get_endp(s); | |
3446 | stream_forward_endp(s, OSPF_LS_UPD_MIN_SIZE); | |
3447 | length += OSPF_LS_UPD_MIN_SIZE; | |
3448 | ||
3449 | /* Calculate amount of packet usable for data. */ | |
3450 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
3451 | ||
3452 | while ((node = listhead(update)) != NULL) { | |
3453 | struct lsa_header *lsah; | |
3454 | u_int16_t ls_age; | |
3455 | ||
3456 | if (IS_DEBUG_OSPF_EVENT) | |
3457 | zlog_debug("ospf_make_ls_upd: List Iteration %d", | |
3458 | count); | |
3459 | ||
3460 | lsa = listgetdata(node); | |
3461 | ||
3462 | assert(lsa->data); | |
3463 | ||
3464 | /* Will it fit? */ | |
3465 | if (length + delta + ntohs(lsa->data->length) > size_noauth) | |
3466 | break; | |
3467 | ||
3468 | /* Keep pointer to LS age. */ | |
3469 | lsah = (struct lsa_header *)(STREAM_DATA(s) | |
3470 | + stream_get_endp(s)); | |
3471 | ||
3472 | /* Put LSA to Link State Request. */ | |
3473 | stream_put(s, lsa->data, ntohs(lsa->data->length)); | |
718e3744 | 3474 | |
d62a17ae | 3475 | /* Set LS age. */ |
3476 | /* each hop must increment an lsa_age by transmit_delay | |
3477 | of OSPF interface */ | |
3478 | ls_age = ls_age_increment(lsa, | |
3479 | OSPF_IF_PARAM(oi, transmit_delay)); | |
3480 | lsah->ls_age = htons(ls_age); | |
3481 | ||
3482 | length += ntohs(lsa->data->length); | |
3483 | count++; | |
3484 | ||
3485 | list_delete_node(update, node); | |
3486 | ospf_lsa_unlock(&lsa); /* oi->ls_upd_queue */ | |
3487 | } | |
3488 | ||
3489 | /* Now set #LSAs. */ | |
3490 | stream_putl_at(s, pp, count); | |
3491 | ||
3492 | if (IS_DEBUG_OSPF_EVENT) | |
3493 | zlog_debug("ospf_make_ls_upd: Stop"); | |
3494 | return length; | |
718e3744 | 3495 | } |
3496 | ||
d62a17ae | 3497 | static int ospf_make_ls_ack(struct ospf_interface *oi, struct list *ack, |
3498 | struct stream *s) | |
718e3744 | 3499 | { |
d62a17ae | 3500 | struct listnode *node, *nnode; |
3501 | u_int16_t length = OSPF_LS_ACK_MIN_SIZE; | |
3502 | unsigned long delta = stream_get_endp(s) + 24; | |
3503 | struct ospf_lsa *lsa; | |
718e3744 | 3504 | |
d62a17ae | 3505 | for (ALL_LIST_ELEMENTS(ack, node, nnode, lsa)) { |
3506 | assert(lsa); | |
718e3744 | 3507 | |
d62a17ae | 3508 | if (length + delta > ospf_packet_max(oi)) |
3509 | break; | |
718e3744 | 3510 | |
d62a17ae | 3511 | stream_put(s, lsa->data, OSPF_LSA_HEADER_SIZE); |
3512 | length += OSPF_LSA_HEADER_SIZE; | |
3513 | ||
3514 | listnode_delete(ack, lsa); | |
3515 | ospf_lsa_unlock(&lsa); /* oi->ls_ack_direct.ls_ack */ | |
3516 | } | |
3517 | ||
3518 | return length; | |
3519 | } | |
3520 | ||
3521 | static void ospf_hello_send_sub(struct ospf_interface *oi, in_addr_t addr) | |
3522 | { | |
3523 | struct ospf_packet *op; | |
3524 | u_int16_t length = OSPF_HEADER_SIZE; | |
718e3744 | 3525 | |
d62a17ae | 3526 | op = ospf_packet_new(oi->ifp->mtu); |
718e3744 | 3527 | |
d62a17ae | 3528 | /* Prepare OSPF common header. */ |
3529 | ospf_make_header(OSPF_MSG_HELLO, oi, op->s); | |
718e3744 | 3530 | |
d62a17ae | 3531 | /* Prepare OSPF Hello body. */ |
3532 | length += ospf_make_hello(oi, op->s); | |
718e3744 | 3533 | |
d62a17ae | 3534 | /* Fill OSPF header. */ |
3535 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3536 | |
d62a17ae | 3537 | /* Set packet length. */ |
3538 | op->length = length; | |
3539 | ||
3540 | op->dst.s_addr = addr; | |
3541 | ||
b5a8894d CS |
3542 | if (IS_DEBUG_OSPF_EVENT) { |
3543 | if (oi->ospf->vrf_id) | |
996c9314 LB |
3544 | zlog_debug( |
3545 | "%s: Hello Tx interface %s ospf vrf %s id %u", | |
3546 | __PRETTY_FUNCTION__, oi->ifp->name, | |
3547 | ospf_vrf_id_to_name(oi->ospf->vrf_id), | |
3548 | oi->ospf->vrf_id); | |
b5a8894d | 3549 | } |
d62a17ae | 3550 | /* Add packet to the top of the interface output queue, so that they |
3551 | * can't get delayed by things like long queues of LS Update packets | |
3552 | */ | |
3553 | ospf_packet_add_top(oi, op); | |
3554 | ||
3555 | /* Hook thread to write packet. */ | |
3556 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3557 | } |
3558 | ||
d62a17ae | 3559 | static void ospf_poll_send(struct ospf_nbr_nbma *nbr_nbma) |
718e3744 | 3560 | { |
d62a17ae | 3561 | struct ospf_interface *oi; |
718e3744 | 3562 | |
d62a17ae | 3563 | oi = nbr_nbma->oi; |
3564 | assert(oi); | |
718e3744 | 3565 | |
d62a17ae | 3566 | /* If this is passive interface, do not send OSPF Hello. */ |
3567 | if (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) | |
3568 | return; | |
718e3744 | 3569 | |
d62a17ae | 3570 | if (oi->type != OSPF_IFTYPE_NBMA) |
3571 | return; | |
718e3744 | 3572 | |
d62a17ae | 3573 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) |
3574 | return; | |
718e3744 | 3575 | |
d62a17ae | 3576 | if (PRIORITY(oi) == 0) |
3577 | return; | |
718e3744 | 3578 | |
d62a17ae | 3579 | if (nbr_nbma->priority == 0 && oi->state != ISM_DR |
3580 | && oi->state != ISM_Backup) | |
3581 | return; | |
718e3744 | 3582 | |
d62a17ae | 3583 | ospf_hello_send_sub(oi, nbr_nbma->addr.s_addr); |
718e3744 | 3584 | } |
3585 | ||
d62a17ae | 3586 | int ospf_poll_timer(struct thread *thread) |
718e3744 | 3587 | { |
d62a17ae | 3588 | struct ospf_nbr_nbma *nbr_nbma; |
718e3744 | 3589 | |
d62a17ae | 3590 | nbr_nbma = THREAD_ARG(thread); |
3591 | nbr_nbma->t_poll = NULL; | |
718e3744 | 3592 | |
d62a17ae | 3593 | if (IS_DEBUG_OSPF(nsm, NSM_TIMERS)) |
3594 | zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)", | |
3595 | IF_NAME(nbr_nbma->oi), inet_ntoa(nbr_nbma->addr)); | |
718e3744 | 3596 | |
d62a17ae | 3597 | ospf_poll_send(nbr_nbma); |
718e3744 | 3598 | |
d62a17ae | 3599 | if (nbr_nbma->v_poll > 0) |
3600 | OSPF_POLL_TIMER_ON(nbr_nbma->t_poll, ospf_poll_timer, | |
3601 | nbr_nbma->v_poll); | |
718e3744 | 3602 | |
d62a17ae | 3603 | return 0; |
718e3744 | 3604 | } |
3605 | ||
3606 | ||
d62a17ae | 3607 | int ospf_hello_reply_timer(struct thread *thread) |
718e3744 | 3608 | { |
d62a17ae | 3609 | struct ospf_neighbor *nbr; |
718e3744 | 3610 | |
d62a17ae | 3611 | nbr = THREAD_ARG(thread); |
3612 | nbr->t_hello_reply = NULL; | |
718e3744 | 3613 | |
d62a17ae | 3614 | assert(nbr->oi); |
718e3744 | 3615 | |
d62a17ae | 3616 | if (IS_DEBUG_OSPF(nsm, NSM_TIMERS)) |
3617 | zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)", | |
3618 | IF_NAME(nbr->oi), inet_ntoa(nbr->router_id)); | |
718e3744 | 3619 | |
d62a17ae | 3620 | ospf_hello_send_sub(nbr->oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3621 | |
d62a17ae | 3622 | return 0; |
718e3744 | 3623 | } |
3624 | ||
3625 | /* Send OSPF Hello. */ | |
d62a17ae | 3626 | void ospf_hello_send(struct ospf_interface *oi) |
3627 | { | |
3628 | /* If this is passive interface, do not send OSPF Hello. */ | |
3629 | if (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) | |
3630 | return; | |
3631 | ||
3632 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
3633 | struct ospf_neighbor *nbr; | |
3634 | struct route_node *rn; | |
3635 | ||
3636 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3637 | if ((nbr = rn->info)) | |
3638 | if (nbr != oi->nbr_self) | |
3639 | if (nbr->state != NSM_Down) { | |
3640 | /* RFC 2328 Section 9.5.1 | |
3641 | If the router is not | |
3642 | eligible to become Designated | |
3643 | Router, | |
3644 | it must periodically send | |
3645 | Hello Packets to both the | |
3646 | Designated Router and the | |
3647 | Backup Designated Router (if | |
3648 | they | |
3649 | exist). */ | |
3650 | if (PRIORITY(oi) == 0 | |
3651 | && IPV4_ADDR_CMP( | |
3652 | &DR(oi), | |
3653 | &nbr->address.u | |
3654 | .prefix4) | |
3655 | && IPV4_ADDR_CMP( | |
3656 | &BDR(oi), | |
3657 | &nbr->address.u | |
3658 | .prefix4)) | |
3659 | continue; | |
3660 | ||
3661 | /* If the router is eligible to | |
3662 | become Designated Router, it | |
3663 | must periodically send Hello | |
3664 | Packets to all neighbors that | |
3665 | are also eligible. In | |
3666 | addition, if the router is | |
3667 | itself the | |
3668 | Designated Router or Backup | |
3669 | Designated Router, it must | |
3670 | also | |
3671 | send periodic Hello Packets | |
3672 | to all other neighbors. */ | |
3673 | ||
3674 | if (nbr->priority == 0 | |
3675 | && oi->state == ISM_DROther) | |
3676 | continue; | |
3677 | /* if oi->state == Waiting, send | |
3678 | * hello to all neighbors */ | |
3679 | ospf_hello_send_sub( | |
3680 | oi, | |
3681 | nbr->address.u.prefix4 | |
3682 | .s_addr); | |
3683 | } | |
3684 | } else { | |
3685 | /* Decide destination address. */ | |
3686 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3687 | ospf_hello_send_sub(oi, oi->vl_data->peer_addr.s_addr); | |
3688 | else | |
3689 | ospf_hello_send_sub(oi, htonl(OSPF_ALLSPFROUTERS)); | |
3690 | } | |
718e3744 | 3691 | } |
3692 | ||
3693 | /* Send OSPF Database Description. */ | |
d62a17ae | 3694 | void ospf_db_desc_send(struct ospf_neighbor *nbr) |
718e3744 | 3695 | { |
d62a17ae | 3696 | struct ospf_interface *oi; |
3697 | struct ospf_packet *op; | |
3698 | u_int16_t length = OSPF_HEADER_SIZE; | |
718e3744 | 3699 | |
d62a17ae | 3700 | oi = nbr->oi; |
3701 | op = ospf_packet_new(oi->ifp->mtu); | |
718e3744 | 3702 | |
d62a17ae | 3703 | /* Prepare OSPF common header. */ |
3704 | ospf_make_header(OSPF_MSG_DB_DESC, oi, op->s); | |
718e3744 | 3705 | |
d62a17ae | 3706 | /* Prepare OSPF Database Description body. */ |
3707 | length += ospf_make_db_desc(oi, nbr, op->s); | |
718e3744 | 3708 | |
d62a17ae | 3709 | /* Fill OSPF header. */ |
3710 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3711 | |
d62a17ae | 3712 | /* Set packet length. */ |
3713 | op->length = length; | |
718e3744 | 3714 | |
d62a17ae | 3715 | /* Decide destination address. */ |
3716 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3717 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3718 | else | |
3719 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3720 | |
d62a17ae | 3721 | /* Add packet to the interface output queue. */ |
3722 | ospf_packet_add(oi, op); | |
718e3744 | 3723 | |
d62a17ae | 3724 | /* Hook thread to write packet. */ |
3725 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3726 | |
d62a17ae | 3727 | /* Remove old DD packet, then copy new one and keep in neighbor |
3728 | * structure. */ | |
3729 | if (nbr->last_send) | |
3730 | ospf_packet_free(nbr->last_send); | |
3731 | nbr->last_send = ospf_packet_dup(op); | |
3732 | monotime(&nbr->last_send_ts); | |
718e3744 | 3733 | } |
3734 | ||
3735 | /* Re-send Database Description. */ | |
d62a17ae | 3736 | void ospf_db_desc_resend(struct ospf_neighbor *nbr) |
718e3744 | 3737 | { |
d62a17ae | 3738 | struct ospf_interface *oi; |
718e3744 | 3739 | |
d62a17ae | 3740 | oi = nbr->oi; |
718e3744 | 3741 | |
d62a17ae | 3742 | /* Add packet to the interface output queue. */ |
3743 | ospf_packet_add(oi, ospf_packet_dup(nbr->last_send)); | |
718e3744 | 3744 | |
d62a17ae | 3745 | /* Hook thread to write packet. */ |
3746 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3747 | } |
3748 | ||
3749 | /* Send Link State Request. */ | |
d62a17ae | 3750 | void ospf_ls_req_send(struct ospf_neighbor *nbr) |
718e3744 | 3751 | { |
d62a17ae | 3752 | struct ospf_interface *oi; |
3753 | struct ospf_packet *op; | |
3754 | u_int16_t length = OSPF_HEADER_SIZE; | |
718e3744 | 3755 | |
d62a17ae | 3756 | oi = nbr->oi; |
3757 | op = ospf_packet_new(oi->ifp->mtu); | |
718e3744 | 3758 | |
d62a17ae | 3759 | /* Prepare OSPF common header. */ |
3760 | ospf_make_header(OSPF_MSG_LS_REQ, oi, op->s); | |
718e3744 | 3761 | |
d62a17ae | 3762 | /* Prepare OSPF Link State Request body. */ |
3763 | length += ospf_make_ls_req(nbr, op->s); | |
3764 | if (length == OSPF_HEADER_SIZE) { | |
3765 | ospf_packet_free(op); | |
3766 | return; | |
3767 | } | |
718e3744 | 3768 | |
d62a17ae | 3769 | /* Fill OSPF header. */ |
3770 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3771 | |
d62a17ae | 3772 | /* Set packet length. */ |
3773 | op->length = length; | |
718e3744 | 3774 | |
d62a17ae | 3775 | /* Decide destination address. */ |
3776 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3777 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3778 | else | |
3779 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3780 | |
d62a17ae | 3781 | /* Add packet to the interface output queue. */ |
3782 | ospf_packet_add(oi, op); | |
718e3744 | 3783 | |
d62a17ae | 3784 | /* Hook thread to write packet. */ |
3785 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3786 | |
d62a17ae | 3787 | /* Add Link State Request Retransmission Timer. */ |
3788 | OSPF_NSM_TIMER_ON(nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
718e3744 | 3789 | } |
3790 | ||
3791 | /* Send Link State Update with an LSA. */ | |
d62a17ae | 3792 | void ospf_ls_upd_send_lsa(struct ospf_neighbor *nbr, struct ospf_lsa *lsa, |
3793 | int flag) | |
718e3744 | 3794 | { |
d62a17ae | 3795 | struct list *update; |
718e3744 | 3796 | |
d62a17ae | 3797 | update = list_new(); |
718e3744 | 3798 | |
d62a17ae | 3799 | listnode_add(update, lsa); |
046460a1 CS |
3800 | |
3801 | /*ospf instance is going down, send self originated | |
3802 | * MAXAGE LSA update to neighbors to remove from LSDB */ | |
3803 | if (nbr->oi->ospf->inst_shutdown && IS_LSA_MAXAGE(lsa)) | |
3804 | ospf_ls_upd_send(nbr, update, flag, 1); | |
3805 | else | |
3806 | ospf_ls_upd_send(nbr, update, flag, 0); | |
718e3744 | 3807 | |
affe9e99 | 3808 | list_delete_and_null(&update); |
718e3744 | 3809 | } |
3810 | ||
68b7339a | 3811 | /* Determine size for packet. Must be at least big enough to accomodate next |
3812 | * LSA on list, which may be bigger than MTU size. | |
3813 | * | |
3814 | * Return pointer to new ospf_packet | |
3815 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3816 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3817 | */ | |
d62a17ae | 3818 | static struct ospf_packet *ospf_ls_upd_packet_new(struct list *update, |
3819 | struct ospf_interface *oi) | |
3820 | { | |
3821 | struct ospf_lsa *lsa; | |
3822 | struct listnode *ln; | |
3823 | size_t size; | |
3824 | static char warned = 0; | |
3825 | ||
3826 | lsa = listgetdata((ln = listhead(update))); | |
3827 | assert(lsa->data); | |
3828 | ||
3829 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs(lsa->data->length)) | |
3830 | > ospf_packet_max(oi)) { | |
3831 | if (!warned) { | |
3832 | zlog_warn( | |
3833 | "ospf_ls_upd_packet_new: oversized LSA encountered!" | |
3834 | "will need to fragment. Not optimal. Try divide up" | |
3835 | " your network with areas. Use 'debug ospf packet send'" | |
3836 | " to see details, or look at 'show ip ospf database ..'"); | |
3837 | warned = 1; | |
3838 | } | |
3839 | ||
3840 | if (IS_DEBUG_OSPF_PACKET(0, SEND)) | |
3841 | zlog_debug( | |
3842 | "ospf_ls_upd_packet_new: oversized LSA id:%s," | |
3843 | " %d bytes originated by %s, will be fragmented!", | |
3844 | inet_ntoa(lsa->data->id), | |
3845 | ntohs(lsa->data->length), | |
3846 | inet_ntoa(lsa->data->adv_router)); | |
3847 | ||
3848 | /* | |
3849 | * Allocate just enough to fit this LSA only, to avoid including | |
3850 | * other | |
3851 | * LSAs in fragmented LSA Updates. | |
3852 | */ | |
3853 | size = ntohs(lsa->data->length) | |
3854 | + (oi->ifp->mtu - ospf_packet_max(oi)) | |
3855 | + OSPF_LS_UPD_MIN_SIZE; | |
3856 | } else | |
3857 | size = oi->ifp->mtu; | |
3858 | ||
3859 | if (size > OSPF_MAX_PACKET_SIZE) { | |
3860 | zlog_warn( | |
3861 | "ospf_ls_upd_packet_new: oversized LSA id:%s too big," | |
3862 | " %d bytes, packet size %ld, dropping it completely." | |
3863 | " OSPF routing is broken!", | |
3864 | inet_ntoa(lsa->data->id), ntohs(lsa->data->length), | |
3865 | (long int)size); | |
3866 | list_delete_node(update, ln); | |
3867 | return NULL; | |
3868 | } | |
718e3744 | 3869 | |
d62a17ae | 3870 | /* IP header is built up separately by ospf_write(). This means, that we |
3871 | * must | |
3872 | * reduce the "affordable" size just calculated by length of an IP | |
3873 | * header. | |
3874 | * This makes sure, that even if we manage to fill the payload with LSA | |
3875 | * data | |
3876 | * completely, the final packet (our data plus IP header) still fits | |
3877 | * into | |
3878 | * outgoing interface MTU. This correction isn't really meaningful for | |
3879 | * an | |
3880 | * oversized LSA, but for consistency the correction is done for both | |
3881 | * cases. | |
3882 | * | |
3883 | * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size | |
3884 | */ | |
3885 | return ospf_packet_new(size - sizeof(struct ip)); | |
718e3744 | 3886 | } |
3887 | ||
d62a17ae | 3888 | static void ospf_ls_upd_queue_send(struct ospf_interface *oi, |
046460a1 CS |
3889 | struct list *update, struct in_addr addr, |
3890 | int send_lsupd_now) | |
718e3744 | 3891 | { |
d62a17ae | 3892 | struct ospf_packet *op; |
3893 | u_int16_t length = OSPF_HEADER_SIZE; | |
3894 | ||
3895 | if (IS_DEBUG_OSPF_EVENT) | |
3896 | zlog_debug("listcount = %d, [%s]dst %s", listcount(update), | |
3897 | IF_NAME(oi), inet_ntoa(addr)); | |
3898 | ||
19274fe8 OD |
3899 | /* Check that we have really something to process */ |
3900 | if (listcount(update) == 0) | |
3901 | return; | |
3902 | ||
d62a17ae | 3903 | op = ospf_ls_upd_packet_new(update, oi); |
718e3744 | 3904 | |
d62a17ae | 3905 | /* Prepare OSPF common header. */ |
3906 | ospf_make_header(OSPF_MSG_LS_UPD, oi, op->s); | |
718e3744 | 3907 | |
d62a17ae | 3908 | /* Prepare OSPF Link State Update body. |
3909 | * Includes Type-7 translation. | |
3910 | */ | |
3911 | length += ospf_make_ls_upd(oi, update, op->s); | |
3912 | ||
3913 | /* Fill OSPF header. */ | |
3914 | ospf_fill_header(oi, op->s, length); | |
3915 | ||
3916 | /* Set packet length. */ | |
3917 | op->length = length; | |
3918 | ||
3919 | /* Decide destination address. */ | |
3920 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3921 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3922 | else | |
3923 | op->dst.s_addr = addr.s_addr; | |
3924 | ||
3925 | /* Add packet to the interface output queue. */ | |
3926 | ospf_packet_add(oi, op); | |
046460a1 CS |
3927 | /* Call ospf_write() right away to send ospf packets to neighbors */ |
3928 | if (send_lsupd_now) { | |
3929 | struct thread os_packet_thd; | |
3930 | ||
3931 | os_packet_thd.arg = (void *)oi->ospf; | |
3932 | if (oi->on_write_q == 0) { | |
3933 | listnode_add(oi->ospf->oi_write_q, oi); | |
3934 | oi->on_write_q = 1; | |
3935 | } | |
3936 | ospf_write(&os_packet_thd); | |
3937 | } else { | |
3938 | /* Hook thread to write packet. */ | |
3939 | OSPF_ISM_WRITE_ON(oi->ospf); | |
3940 | } | |
d62a17ae | 3941 | } |
3942 | ||
3943 | static int ospf_ls_upd_send_queue_event(struct thread *thread) | |
3944 | { | |
3945 | struct ospf_interface *oi = THREAD_ARG(thread); | |
3946 | struct route_node *rn; | |
3947 | struct route_node *rnext; | |
3948 | struct list *update; | |
3949 | char again = 0; | |
3950 | ||
3951 | oi->t_ls_upd_event = NULL; | |
3952 | ||
3953 | if (IS_DEBUG_OSPF_EVENT) | |
3954 | zlog_debug("ospf_ls_upd_send_queue start"); | |
3955 | ||
3956 | for (rn = route_top(oi->ls_upd_queue); rn; rn = rnext) { | |
3957 | rnext = route_next(rn); | |
3958 | ||
3959 | if (rn->info == NULL) | |
3960 | continue; | |
3961 | ||
3962 | update = (struct list *)rn->info; | |
3963 | ||
046460a1 | 3964 | ospf_ls_upd_queue_send(oi, update, rn->p.u.prefix4, 0); |
d62a17ae | 3965 | |
3966 | /* list might not be empty. */ | |
3967 | if (listcount(update) == 0) { | |
affe9e99 | 3968 | list_delete_and_null((struct list **)&rn->info); |
d62a17ae | 3969 | route_unlock_node(rn); |
3970 | } else | |
3971 | again = 1; | |
3972 | } | |
3973 | ||
3974 | if (again != 0) { | |
3975 | if (IS_DEBUG_OSPF_EVENT) | |
3976 | zlog_debug( | |
3977 | "ospf_ls_upd_send_queue: update lists not cleared," | |
3978 | " %d nodes to try again, raising new event", | |
3979 | again); | |
3980 | oi->t_ls_upd_event = NULL; | |
3981 | thread_add_event(master, ospf_ls_upd_send_queue_event, oi, 0, | |
3982 | &oi->t_ls_upd_event); | |
3983 | } | |
3984 | ||
3985 | if (IS_DEBUG_OSPF_EVENT) | |
3986 | zlog_debug("ospf_ls_upd_send_queue stop"); | |
3987 | ||
3988 | return 0; | |
3989 | } | |
3990 | ||
046460a1 CS |
3991 | void ospf_ls_upd_send(struct ospf_neighbor *nbr, struct list *update, int flag, |
3992 | int send_lsupd_now) | |
d62a17ae | 3993 | { |
3994 | struct ospf_interface *oi; | |
3995 | struct ospf_lsa *lsa; | |
3996 | struct prefix_ipv4 p; | |
3997 | struct route_node *rn; | |
3998 | struct listnode *node; | |
3999 | ||
4000 | oi = nbr->oi; | |
4001 | ||
4002 | p.family = AF_INET; | |
4003 | p.prefixlen = IPV4_MAX_BITLEN; | |
4004 | ||
4005 | /* Decide destination address. */ | |
4006 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
4007 | p.prefix = oi->vl_data->peer_addr; | |
4008 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4009 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4010 | else if (flag == OSPF_SEND_PACKET_DIRECT) | |
4011 | p.prefix = nbr->address.u.prefix4; | |
4012 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
4013 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4014 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) | |
4015 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4016 | else | |
4017 | p.prefix.s_addr = htonl(OSPF_ALLDROUTERS); | |
4018 | ||
4019 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
4020 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
4021 | zlog_warn( | |
4022 | "* LS-Update is directly sent on NBMA network."); | |
19aad877 | 4023 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix)) |
d62a17ae | 4024 | zlog_warn("* LS-Update is sent to myself."); |
4025 | } | |
4026 | ||
4027 | rn = route_node_get(oi->ls_upd_queue, (struct prefix *)&p); | |
4028 | ||
4029 | if (rn->info == NULL) | |
4030 | rn->info = list_new(); | |
4031 | else | |
4032 | route_unlock_node(rn); | |
4033 | ||
4034 | for (ALL_LIST_ELEMENTS_RO(update, node, lsa)) | |
4035 | listnode_add(rn->info, | |
4036 | ospf_lsa_lock(lsa)); /* oi->ls_upd_queue */ | |
046460a1 CS |
4037 | if (send_lsupd_now) { |
4038 | struct list *send_update_list; | |
4039 | struct route_node *rn, *rnext; | |
d62a17ae | 4040 | |
046460a1 CS |
4041 | for (rn = route_top(oi->ls_upd_queue); rn; rn = rnext) { |
4042 | rnext = route_next(rn); | |
4043 | ||
4044 | if (rn->info == NULL) | |
4045 | continue; | |
4046 | ||
4047 | send_update_list = (struct list *)rn->info; | |
4048 | ||
4049 | ospf_ls_upd_queue_send(oi, send_update_list, | |
4050 | rn->p.u.prefix4, 1); | |
046460a1 CS |
4051 | } |
4052 | } else | |
4053 | thread_add_event(master, ospf_ls_upd_send_queue_event, oi, 0, | |
996c9314 | 4054 | &oi->t_ls_upd_event); |
718e3744 | 4055 | } |
4056 | ||
d62a17ae | 4057 | static void ospf_ls_ack_send_list(struct ospf_interface *oi, struct list *ack, |
4058 | struct in_addr dst) | |
718e3744 | 4059 | { |
d62a17ae | 4060 | struct ospf_packet *op; |
4061 | u_int16_t length = OSPF_HEADER_SIZE; | |
4062 | ||
4063 | op = ospf_packet_new(oi->ifp->mtu); | |
4064 | ||
4065 | /* Prepare OSPF common header. */ | |
4066 | ospf_make_header(OSPF_MSG_LS_ACK, oi, op->s); | |
4067 | ||
4068 | /* Prepare OSPF Link State Acknowledgment body. */ | |
4069 | length += ospf_make_ls_ack(oi, ack, op->s); | |
4070 | ||
4071 | /* Fill OSPF header. */ | |
4072 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 4073 | |
d62a17ae | 4074 | /* Set packet length. */ |
4075 | op->length = length; | |
4076 | ||
4077 | /* Decide destination address. */ | |
4078 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4079 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4080 | else | |
4081 | op->dst.s_addr = dst.s_addr; | |
4082 | ||
4083 | /* Add packet to the interface output queue. */ | |
4084 | ospf_packet_add(oi, op); | |
4085 | ||
4086 | /* Hook thread to write packet. */ | |
4087 | OSPF_ISM_WRITE_ON(oi->ospf); | |
4088 | } | |
4089 | ||
4090 | static int ospf_ls_ack_send_event(struct thread *thread) | |
4091 | { | |
4092 | struct ospf_interface *oi = THREAD_ARG(thread); | |
4093 | ||
4094 | oi->t_ls_ack_direct = NULL; | |
4095 | ||
4096 | while (listcount(oi->ls_ack_direct.ls_ack)) | |
4097 | ospf_ls_ack_send_list(oi, oi->ls_ack_direct.ls_ack, | |
4098 | oi->ls_ack_direct.dst); | |
4099 | ||
4100 | return 0; | |
4101 | } | |
4102 | ||
4103 | void ospf_ls_ack_send(struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
4104 | { | |
4105 | struct ospf_interface *oi = nbr->oi; | |
4106 | ||
4107 | if (listcount(oi->ls_ack_direct.ls_ack) == 0) | |
4108 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
4109 | ||
4110 | listnode_add(oi->ls_ack_direct.ls_ack, ospf_lsa_lock(lsa)); | |
4111 | ||
4112 | thread_add_event(master, ospf_ls_ack_send_event, oi, 0, | |
4113 | &oi->t_ls_ack_direct); | |
718e3744 | 4114 | } |
4115 | ||
4116 | /* Send Link State Acknowledgment delayed. */ | |
d62a17ae | 4117 | void ospf_ls_ack_send_delayed(struct ospf_interface *oi) |
4118 | { | |
4119 | struct in_addr dst; | |
4120 | ||
4121 | /* Decide destination address. */ | |
4122 | /* RFC2328 Section 13.5 On non-broadcast | |
4123 | networks, delayed Link State Acknowledgment packets must be | |
4124 | unicast separately over each adjacency (i.e., neighbor whose | |
4125 | state is >= Exchange). */ | |
4126 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
4127 | struct ospf_neighbor *nbr; | |
4128 | struct route_node *rn; | |
4129 | ||
4130 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
4131 | if ((nbr = rn->info) != NULL) | |
4132 | if (nbr != oi->nbr_self | |
4133 | && nbr->state >= NSM_Exchange) | |
4134 | while (listcount(oi->ls_ack)) | |
4135 | ospf_ls_ack_send_list( | |
4136 | oi, oi->ls_ack, | |
4137 | nbr->address.u.prefix4); | |
4138 | return; | |
4139 | } | |
4140 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
4141 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
4142 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
4143 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4144 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4145 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4146 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) | |
4147 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4148 | else | |
4149 | dst.s_addr = htonl(OSPF_ALLDROUTERS); | |
4150 | ||
4151 | while (listcount(oi->ls_ack)) | |
4152 | ospf_ls_ack_send_list(oi, oi->ls_ack, dst); | |
718e3744 | 4153 | } |
8b6912c2 DS |
4154 | |
4155 | /* | |
4156 | * On pt-to-pt links, all OSPF control packets are sent to the multicast | |
4157 | * address. As a result, the kernel does not need to learn the interface | |
4158 | * MAC of the OSPF neighbor. However, in our world, this will delay | |
4159 | * convergence. Take the case when due to a link flap, all routes now | |
4160 | * want to use an interface which was deemed to be costlier prior to this | |
4161 | * event. For routes that will be installed, the missing MAC will have | |
4162 | * punt-to-CPU set on them. This may overload the CPU control path that | |
4163 | * can be avoided if the MAC was known apriori. | |
4164 | */ | |
89a48046 | 4165 | #define OSPF_PING_NBR_STR_MAX (BUFSIZ) |
d62a17ae | 4166 | void ospf_proactively_arp(struct ospf_neighbor *nbr) |
4167 | { | |
4168 | char ping_nbr[OSPF_PING_NBR_STR_MAX]; | |
d62a17ae | 4169 | int ret; |
4170 | ||
4171 | if (!nbr || !nbr->oi || !nbr->oi->ifp) | |
4172 | return; | |
4173 | ||
89a48046 | 4174 | snprintf(ping_nbr, sizeof(ping_nbr), |
996c9314 LB |
4175 | "ping -c 1 -I %s %s > /dev/null 2>&1 &", nbr->oi->ifp->name, |
4176 | inet_ntoa(nbr->address.u.prefix4)); | |
89a48046 | 4177 | |
d62a17ae | 4178 | ret = system(ping_nbr); |
4179 | if (IS_DEBUG_OSPF_EVENT) | |
4180 | zlog_debug("Executed %s %s", ping_nbr, | |
4181 | ((ret == 0) ? "successfully" : "but failed")); | |
8b6912c2 | 4182 | } |