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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" |
c9cc11f6 | 38 | #include "lib_errors.h" |
718e3744 | 39 | |
40 | #include "ospfd/ospfd.h" | |
41 | #include "ospfd/ospf_network.h" | |
42 | #include "ospfd/ospf_interface.h" | |
43 | #include "ospfd/ospf_ism.h" | |
44 | #include "ospfd/ospf_asbr.h" | |
45 | #include "ospfd/ospf_lsa.h" | |
46 | #include "ospfd/ospf_lsdb.h" | |
47 | #include "ospfd/ospf_neighbor.h" | |
48 | #include "ospfd/ospf_nsm.h" | |
49 | #include "ospfd/ospf_packet.h" | |
50 | #include "ospfd/ospf_spf.h" | |
51 | #include "ospfd/ospf_flood.h" | |
52 | #include "ospfd/ospf_dump.h" | |
c9cc11f6 | 53 | #include "ospfd/ospf_errors.h" |
718e3744 | 54 | |
166b75c2 DS |
55 | /* |
56 | * OSPF Fragmentation / fragmented writes | |
57 | * | |
58 | * ospfd can support writing fragmented packets, for cases where | |
59 | * kernel will not fragment IP_HDRINCL and/or multicast destined | |
60 | * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However, | |
61 | * SunOS, probably BSD too, clobber the user supplied IP ID and IP | |
62 | * flags fields, hence user-space fragmentation will not work. | |
63 | * Only Linux is known to leave IP header unmolested. | |
64 | * Further, fragmentation really should be done the kernel, which already | |
65 | * supports it, and which avoids nasty IP ID state problems. | |
66 | * | |
67 | * Fragmentation of OSPF packets can be required on networks with router | |
68 | * with many many interfaces active in one area, or on networks with links | |
69 | * with low MTUs. | |
70 | */ | |
71 | #ifdef GNU_LINUX | |
72 | #define WANT_OSPF_WRITE_FRAGMENT | |
73 | #endif | |
74 | ||
718e3744 | 75 | /* Packet Type String. */ |
d62a17ae | 76 | const struct message ospf_packet_type_str[] = { |
77 | {OSPF_MSG_HELLO, "Hello"}, | |
78 | {OSPF_MSG_DB_DESC, "Database Description"}, | |
79 | {OSPF_MSG_LS_REQ, "Link State Request"}, | |
80 | {OSPF_MSG_LS_UPD, "Link State Update"}, | |
81 | {OSPF_MSG_LS_ACK, "Link State Acknowledgment"}, | |
82 | {0}}; | |
718e3744 | 83 | |
75c8eabb DO |
84 | /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of |
85 | particular types, offset is the "type" field of a packet. */ | |
d7c0a89a | 86 | static const uint16_t ospf_packet_minlen[] = { |
d62a17ae | 87 | 0, |
88 | OSPF_HELLO_MIN_SIZE, | |
89 | OSPF_DB_DESC_MIN_SIZE, | |
90 | OSPF_LS_REQ_MIN_SIZE, | |
91 | OSPF_LS_UPD_MIN_SIZE, | |
92 | OSPF_LS_ACK_MIN_SIZE, | |
75c8eabb DO |
93 | }; |
94 | ||
4e31de79 DO |
95 | /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular |
96 | types, offset is the "LSA type" field. */ | |
d7c0a89a | 97 | static const uint16_t ospf_lsa_minlen[] = { |
d62a17ae | 98 | 0, |
99 | OSPF_ROUTER_LSA_MIN_SIZE, | |
100 | OSPF_NETWORK_LSA_MIN_SIZE, | |
101 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
102 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
103 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
104 | 0, | |
105 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
106 | 0, | |
107 | 0, | |
108 | 0, | |
109 | 0, | |
4e31de79 DO |
110 | }; |
111 | ||
bd5651f0 | 112 | /* for ospf_check_auth() */ |
d62a17ae | 113 | static int ospf_check_sum(struct ospf_header *); |
bd5651f0 | 114 | |
718e3744 | 115 | /* OSPF authentication checking function */ |
d62a17ae | 116 | static int ospf_auth_type(struct ospf_interface *oi) |
718e3744 | 117 | { |
d62a17ae | 118 | int auth_type; |
718e3744 | 119 | |
d62a17ae | 120 | if (OSPF_IF_PARAM(oi, auth_type) == OSPF_AUTH_NOTSET) |
121 | auth_type = oi->area->auth_type; | |
122 | else | |
123 | auth_type = OSPF_IF_PARAM(oi, auth_type); | |
718e3744 | 124 | |
d62a17ae | 125 | /* Handle case where MD5 key list is not configured aka Cisco */ |
126 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC | |
127 | && list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) | |
128 | return OSPF_AUTH_NULL; | |
718e3744 | 129 | |
d62a17ae | 130 | return auth_type; |
718e3744 | 131 | } |
132 | ||
d62a17ae | 133 | struct ospf_packet *ospf_packet_new(size_t size) |
718e3744 | 134 | { |
d62a17ae | 135 | struct ospf_packet *new; |
718e3744 | 136 | |
d62a17ae | 137 | new = XCALLOC(MTYPE_OSPF_PACKET, sizeof(struct ospf_packet)); |
138 | new->s = stream_new(size); | |
718e3744 | 139 | |
d62a17ae | 140 | return new; |
718e3744 | 141 | } |
142 | ||
d62a17ae | 143 | void ospf_packet_free(struct ospf_packet *op) |
718e3744 | 144 | { |
d62a17ae | 145 | if (op->s) |
146 | stream_free(op->s); | |
718e3744 | 147 | |
d62a17ae | 148 | XFREE(MTYPE_OSPF_PACKET, op); |
718e3744 | 149 | } |
150 | ||
4d762f26 | 151 | struct ospf_fifo *ospf_fifo_new(void) |
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) { |
af4c2728 | 235 | flog_err( |
cf444bcf | 236 | EC_OSPF_PKT_PROCESS, |
d62a17ae | 237 | "ospf_packet_add(interface %s in state %d [%s], packet type %s, " |
238 | "destination %s) called with NULL obuf, ignoring " | |
239 | "(please report this bug)!\n", | |
240 | IF_NAME(oi), oi->state, | |
241 | lookup_msg(ospf_ism_state_msg, oi->state, NULL), | |
242 | lookup_msg(ospf_packet_type_str, | |
243 | stream_getc_from(op->s, 1), NULL), | |
244 | inet_ntoa(op->dst)); | |
245 | return; | |
246 | } | |
c3eab871 | 247 | |
d62a17ae | 248 | /* Add packet to end of queue. */ |
249 | ospf_fifo_push(oi->obuf, op); | |
718e3744 | 250 | |
d62a17ae | 251 | /* Debug of packet fifo*/ |
252 | /* ospf_fifo_debug (oi->obuf); */ | |
718e3744 | 253 | } |
254 | ||
d62a17ae | 255 | static void ospf_packet_add_top(struct ospf_interface *oi, |
256 | struct ospf_packet *op) | |
aa276fd7 | 257 | { |
d62a17ae | 258 | if (!oi->obuf) { |
af4c2728 | 259 | flog_err( |
cf444bcf | 260 | EC_OSPF_PKT_PROCESS, |
d62a17ae | 261 | "ospf_packet_add(interface %s in state %d [%s], packet type %s, " |
262 | "destination %s) called with NULL obuf, ignoring " | |
263 | "(please report this bug)!\n", | |
264 | IF_NAME(oi), oi->state, | |
265 | lookup_msg(ospf_ism_state_msg, oi->state, NULL), | |
266 | lookup_msg(ospf_packet_type_str, | |
267 | stream_getc_from(op->s, 1), NULL), | |
268 | inet_ntoa(op->dst)); | |
269 | return; | |
270 | } | |
aa276fd7 | 271 | |
d62a17ae | 272 | /* Add packet to head of queue. */ |
273 | ospf_fifo_push_head(oi->obuf, op); | |
aa276fd7 | 274 | |
d62a17ae | 275 | /* Debug of packet fifo*/ |
276 | /* ospf_fifo_debug (oi->obuf); */ | |
aa276fd7 PJ |
277 | } |
278 | ||
d62a17ae | 279 | void ospf_packet_delete(struct ospf_interface *oi) |
718e3744 | 280 | { |
d62a17ae | 281 | struct ospf_packet *op; |
282 | ||
283 | op = ospf_fifo_pop(oi->obuf); | |
718e3744 | 284 | |
d62a17ae | 285 | if (op) |
286 | ospf_packet_free(op); | |
718e3744 | 287 | } |
288 | ||
d62a17ae | 289 | struct ospf_packet *ospf_packet_dup(struct ospf_packet *op) |
718e3744 | 290 | { |
d62a17ae | 291 | struct ospf_packet *new; |
718e3744 | 292 | |
d62a17ae | 293 | if (stream_get_endp(op->s) != op->length) |
294 | /* XXX size_t */ | |
c9cc11f6 | 295 | zlog_debug( |
d62a17ae | 296 | "ospf_packet_dup stream %lu ospf_packet %u size mismatch", |
d7c0a89a | 297 | (unsigned long)STREAM_SIZE(op->s), op->length); |
30961a15 | 298 | |
d62a17ae | 299 | /* Reserve space for MD5 authentication that may be added later. */ |
300 | new = ospf_packet_new(stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
301 | stream_copy(new->s, op->s); | |
718e3744 | 302 | |
d62a17ae | 303 | new->dst = op->dst; |
304 | new->length = op->length; | |
718e3744 | 305 | |
d62a17ae | 306 | return new; |
718e3744 | 307 | } |
308 | ||
86f1fd96 | 309 | /* XXX inline */ |
d62a17ae | 310 | static unsigned int ospf_packet_authspace(struct ospf_interface *oi) |
86f1fd96 | 311 | { |
d62a17ae | 312 | int auth = 0; |
86f1fd96 | 313 | |
d62a17ae | 314 | if (ospf_auth_type(oi) == OSPF_AUTH_CRYPTOGRAPHIC) |
315 | auth = OSPF_AUTH_MD5_SIZE; | |
86f1fd96 | 316 | |
d62a17ae | 317 | return auth; |
86f1fd96 | 318 | } |
319 | ||
d62a17ae | 320 | static unsigned int ospf_packet_max(struct ospf_interface *oi) |
718e3744 | 321 | { |
d62a17ae | 322 | int max; |
718e3744 | 323 | |
d62a17ae | 324 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
86f1fd96 | 325 | |
d62a17ae | 326 | max -= (OSPF_HEADER_SIZE + sizeof(struct ip)); |
718e3744 | 327 | |
d62a17ae | 328 | return max; |
718e3744 | 329 | } |
330 | ||
6b0655a2 | 331 | |
d62a17ae | 332 | static int ospf_check_md5_digest(struct ospf_interface *oi, |
333 | struct ospf_header *ospfh) | |
718e3744 | 334 | { |
d62a17ae | 335 | MD5_CTX ctx; |
336 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; | |
337 | struct crypt_key *ck; | |
338 | struct ospf_neighbor *nbr; | |
d7c0a89a | 339 | uint16_t length = ntohs(ospfh->length); |
d62a17ae | 340 | |
341 | /* Get secret key. */ | |
342 | ck = ospf_crypt_key_lookup(OSPF_IF_PARAM(oi, auth_crypt), | |
343 | ospfh->u.crypt.key_id); | |
344 | if (ck == NULL) { | |
1c50c1c0 QY |
345 | flog_warn(EC_OSPF_MD5, "interface %s: ospf_check_md5 no key %d", |
346 | IF_NAME(oi), ospfh->u.crypt.key_id); | |
d62a17ae | 347 | return 0; |
348 | } | |
718e3744 | 349 | |
d62a17ae | 350 | /* check crypto seqnum. */ |
351 | nbr = ospf_nbr_lookup_by_routerid(oi->nbrs, &ospfh->router_id); | |
718e3744 | 352 | |
d62a17ae | 353 | if (nbr |
354 | && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) { | |
c9cc11f6 | 355 | flog_warn( |
cf444bcf | 356 | EC_OSPF_MD5, |
d62a17ae | 357 | "interface %s: ospf_check_md5 bad sequence %d (expect %d)", |
358 | IF_NAME(oi), ntohl(ospfh->u.crypt.crypt_seqnum), | |
359 | ntohl(nbr->crypt_seqnum)); | |
360 | return 0; | |
361 | } | |
718e3744 | 362 | |
d62a17ae | 363 | /* Generate a digest for the ospf packet - their digest + our digest. */ |
364 | memset(&ctx, 0, sizeof(ctx)); | |
365 | MD5Init(&ctx); | |
366 | MD5Update(&ctx, ospfh, length); | |
367 | MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); | |
368 | MD5Final(digest, &ctx); | |
369 | ||
370 | /* compare the two */ | |
371 | if (memcmp((caddr_t)ospfh + length, digest, OSPF_AUTH_MD5_SIZE)) { | |
cf444bcf | 372 | flog_warn(EC_OSPF_MD5, |
c9cc11f6 | 373 | "interface %s: ospf_check_md5 checksum mismatch", |
d62a17ae | 374 | IF_NAME(oi)); |
375 | return 0; | |
376 | } | |
718e3744 | 377 | |
d62a17ae | 378 | /* save neighbor's crypt_seqnum */ |
379 | if (nbr) | |
380 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
381 | return 1; | |
718e3744 | 382 | } |
383 | ||
384 | /* This function is called from ospf_write(), it will detect the | |
385 | authentication scheme and if it is MD5, it will change the sequence | |
386 | and update the MD5 digest. */ | |
d62a17ae | 387 | static int ospf_make_md5_digest(struct ospf_interface *oi, |
388 | struct ospf_packet *op) | |
389 | { | |
390 | struct ospf_header *ospfh; | |
391 | unsigned char digest[OSPF_AUTH_MD5_SIZE] = {0}; | |
392 | MD5_CTX ctx; | |
393 | void *ibuf; | |
d7c0a89a | 394 | uint32_t t; |
d62a17ae | 395 | struct crypt_key *ck; |
d7c0a89a | 396 | const uint8_t *auth_key; |
d62a17ae | 397 | |
398 | ibuf = STREAM_DATA(op->s); | |
399 | ospfh = (struct ospf_header *)ibuf; | |
400 | ||
401 | if (ntohs(ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
402 | return 0; | |
403 | ||
404 | /* We do this here so when we dup a packet, we don't have to | |
405 | waste CPU rewriting other headers. | |
406 | ||
407 | Note that quagga_time /deliberately/ is not used here */ | |
408 | t = (time(NULL) & 0xFFFFFFFF); | |
409 | if (t > oi->crypt_seqnum) | |
410 | oi->crypt_seqnum = t; | |
411 | else | |
412 | oi->crypt_seqnum++; | |
413 | ||
414 | ospfh->u.crypt.crypt_seqnum = htonl(oi->crypt_seqnum); | |
415 | ||
416 | /* Get MD5 Authentication key from auth_key list. */ | |
417 | if (list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) | |
d7c0a89a | 418 | auth_key = (const uint8_t *)digest; |
d62a17ae | 419 | else { |
420 | ck = listgetdata(listtail(OSPF_IF_PARAM(oi, auth_crypt))); | |
421 | auth_key = ck->auth_key; | |
422 | } | |
718e3744 | 423 | |
d62a17ae | 424 | /* Generate a digest for the entire packet + our secret key. */ |
425 | memset(&ctx, 0, sizeof(ctx)); | |
426 | MD5Init(&ctx); | |
427 | MD5Update(&ctx, ibuf, ntohs(ospfh->length)); | |
428 | MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
429 | MD5Final(digest, &ctx); | |
718e3744 | 430 | |
d62a17ae | 431 | /* Append md5 digest to the end of the stream. */ |
432 | stream_put(op->s, digest, OSPF_AUTH_MD5_SIZE); | |
718e3744 | 433 | |
d62a17ae | 434 | /* We do *NOT* increment the OSPF header length. */ |
435 | op->length = ntohs(ospfh->length) + OSPF_AUTH_MD5_SIZE; | |
30961a15 | 436 | |
d62a17ae | 437 | if (stream_get_endp(op->s) != op->length) |
438 | /* XXX size_t */ | |
c9cc11f6 | 439 | flog_warn( |
cf444bcf | 440 | EC_OSPF_MD5, |
d62a17ae | 441 | "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u", |
d7c0a89a | 442 | (unsigned long)stream_get_endp(op->s), op->length); |
718e3744 | 443 | |
d62a17ae | 444 | return OSPF_AUTH_MD5_SIZE; |
718e3744 | 445 | } |
446 | ||
6b0655a2 | 447 | |
d62a17ae | 448 | static int ospf_ls_req_timer(struct thread *thread) |
718e3744 | 449 | { |
d62a17ae | 450 | struct ospf_neighbor *nbr; |
718e3744 | 451 | |
d62a17ae | 452 | nbr = THREAD_ARG(thread); |
453 | nbr->t_ls_req = NULL; | |
718e3744 | 454 | |
d62a17ae | 455 | /* Send Link State Request. */ |
456 | if (ospf_ls_request_count(nbr)) | |
457 | ospf_ls_req_send(nbr); | |
718e3744 | 458 | |
d62a17ae | 459 | /* Set Link State Request retransmission timer. */ |
460 | OSPF_NSM_TIMER_ON(nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
718e3744 | 461 | |
d62a17ae | 462 | return 0; |
718e3744 | 463 | } |
464 | ||
d62a17ae | 465 | void ospf_ls_req_event(struct ospf_neighbor *nbr) |
718e3744 | 466 | { |
d62a17ae | 467 | if (nbr->t_ls_req) { |
468 | thread_cancel(nbr->t_ls_req); | |
469 | nbr->t_ls_req = NULL; | |
470 | } | |
471 | nbr->t_ls_req = NULL; | |
472 | thread_add_event(master, ospf_ls_req_timer, nbr, 0, &nbr->t_ls_req); | |
718e3744 | 473 | } |
474 | ||
475 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
476 | ospf_neighbor.c */ | |
d62a17ae | 477 | int ospf_ls_upd_timer(struct thread *thread) |
478 | { | |
479 | struct ospf_neighbor *nbr; | |
480 | ||
481 | nbr = THREAD_ARG(thread); | |
482 | nbr->t_ls_upd = NULL; | |
483 | ||
484 | /* Send Link State Update. */ | |
485 | if (ospf_ls_retransmit_count(nbr) > 0) { | |
486 | struct list *update; | |
487 | struct ospf_lsdb *lsdb; | |
488 | int i; | |
489 | int retransmit_interval; | |
490 | ||
491 | retransmit_interval = | |
492 | OSPF_IF_PARAM(nbr->oi, retransmit_interval); | |
493 | ||
494 | lsdb = &nbr->ls_rxmt; | |
495 | update = list_new(); | |
496 | ||
497 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { | |
498 | struct route_table *table = lsdb->type[i].db; | |
499 | struct route_node *rn; | |
500 | ||
501 | for (rn = route_top(table); rn; rn = route_next(rn)) { | |
502 | struct ospf_lsa *lsa; | |
503 | ||
504 | if ((lsa = rn->info) != NULL) { | |
505 | /* Don't retransmit an LSA if we | |
506 | received it within | |
507 | the last RxmtInterval seconds - this | |
508 | is to allow the | |
509 | neighbour a chance to acknowledge the | |
510 | LSA as it may | |
511 | have ben just received before the | |
512 | retransmit timer | |
513 | fired. This is a small tweak to what | |
514 | is in the RFC, | |
515 | but it will cut out out a lot of | |
516 | retransmit traffic | |
517 | - MAG */ | |
518 | if (monotime_since(&lsa->tv_recv, NULL) | |
519 | >= retransmit_interval * 1000000LL) | |
520 | listnode_add(update, rn->info); | |
521 | } | |
522 | } | |
523 | } | |
718e3744 | 524 | |
d62a17ae | 525 | if (listcount(update) > 0) |
996c9314 LB |
526 | ospf_ls_upd_send(nbr, update, OSPF_SEND_PACKET_DIRECT, |
527 | 0); | |
6a154c88 | 528 | list_delete(&update); |
718e3744 | 529 | } |
530 | ||
d62a17ae | 531 | /* Set LS Update retransmission timer. */ |
532 | OSPF_NSM_TIMER_ON(nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
718e3744 | 533 | |
d62a17ae | 534 | return 0; |
718e3744 | 535 | } |
536 | ||
d62a17ae | 537 | int ospf_ls_ack_timer(struct thread *thread) |
718e3744 | 538 | { |
d62a17ae | 539 | struct ospf_interface *oi; |
718e3744 | 540 | |
d62a17ae | 541 | oi = THREAD_ARG(thread); |
542 | oi->t_ls_ack = NULL; | |
718e3744 | 543 | |
d62a17ae | 544 | /* Send Link State Acknowledgment. */ |
545 | if (listcount(oi->ls_ack) > 0) | |
546 | ospf_ls_ack_send_delayed(oi); | |
718e3744 | 547 | |
d62a17ae | 548 | /* Set LS Ack timer. */ |
549 | OSPF_ISM_TIMER_ON(oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
718e3744 | 550 | |
d62a17ae | 551 | return 0; |
718e3744 | 552 | } |
553 | ||
0bfeca3f | 554 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 555 | static void ospf_write_frags(int fd, struct ospf_packet *op, struct ip *iph, |
556 | struct msghdr *msg, unsigned int maxdatasize, | |
d7c0a89a | 557 | unsigned int mtu, int flags, uint8_t type) |
0bfeca3f | 558 | { |
559 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
d7c0a89a | 560 | uint16_t offset; |
d62a17ae | 561 | struct iovec *iovp; |
562 | int ret; | |
563 | ||
564 | assert(op->length == stream_get_endp(op->s)); | |
565 | assert(msg->msg_iovlen == 2); | |
566 | ||
567 | /* we can but try. | |
568 | * | |
569 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
570 | * well as the IP_MF flag, making this all quite pointless. | |
571 | * | |
572 | * However, for a system on which IP_MF is left alone, and ip_id left | |
573 | * alone or else which sets same ip_id for each fragment this might | |
574 | * work, eg linux. | |
575 | * | |
576 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
577 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
578 | * be raised against the various kernels. | |
579 | */ | |
580 | ||
581 | /* set More Frag */ | |
582 | iph->ip_off |= IP_MF; | |
583 | ||
584 | /* ip frag offset is expressed in units of 8byte words */ | |
585 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
586 | ||
587 | iovp = &msg->msg_iov[1]; | |
588 | ||
589 | while ((stream_get_endp(op->s) - stream_get_getp(op->s)) | |
590 | > maxdatasize) { | |
591 | /* data length of this frag is to next offset value */ | |
592 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; | |
593 | iph->ip_len = iovp->iov_len + sizeof(struct ip); | |
594 | assert(iph->ip_len <= mtu); | |
595 | ||
596 | sockopt_iphdrincl_swab_htosys(iph); | |
597 | ||
598 | ret = sendmsg(fd, msg, flags); | |
599 | ||
600 | sockopt_iphdrincl_swab_systoh(iph); | |
601 | ||
602 | if (ret < 0) | |
c9cc11f6 | 603 | flog_err( |
450971aa | 604 | EC_LIB_SOCKET, |
d62a17ae | 605 | "*** ospf_write_frags: sendmsg failed to %s," |
606 | " id %d, off %d, len %d, mtu %u failed with %s", | |
607 | inet_ntoa(iph->ip_dst), iph->ip_id, iph->ip_off, | |
608 | iph->ip_len, mtu, safe_strerror(errno)); | |
609 | ||
610 | if (IS_DEBUG_OSPF_PACKET(type - 1, SEND)) { | |
611 | zlog_debug( | |
612 | "ospf_write_frags: sent id %d, off %d, len %d to %s\n", | |
613 | iph->ip_id, iph->ip_off, iph->ip_len, | |
614 | inet_ntoa(iph->ip_dst)); | |
615 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) { | |
616 | zlog_debug( | |
617 | "-----------------IP Header Dump----------------------"); | |
618 | ospf_ip_header_dump(iph); | |
619 | zlog_debug( | |
620 | "-----------------------------------------------------"); | |
621 | } | |
622 | } | |
623 | ||
624 | iph->ip_off += offset; | |
625 | stream_forward_getp(op->s, iovp->iov_len); | |
2d34fb80 | 626 | iovp->iov_base = stream_pnt(op->s); |
d62a17ae | 627 | } |
628 | ||
629 | /* setup for final fragment */ | |
630 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp(op->s); | |
631 | iph->ip_len = iovp->iov_len + sizeof(struct ip); | |
632 | iph->ip_off &= (~IP_MF); | |
0bfeca3f | 633 | } |
634 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
635 | ||
d62a17ae | 636 | static int ospf_write(struct thread *thread) |
637 | { | |
638 | struct ospf *ospf = THREAD_ARG(thread); | |
639 | struct ospf_interface *oi; | |
640 | struct ospf_interface *last_serviced_oi = NULL; | |
641 | struct ospf_packet *op; | |
642 | struct sockaddr_in sa_dst; | |
643 | struct ip iph; | |
644 | struct msghdr msg; | |
645 | struct iovec iov[2]; | |
d7c0a89a | 646 | uint8_t type; |
d62a17ae | 647 | int ret; |
648 | int flags = 0; | |
649 | struct listnode *node; | |
0bfeca3f | 650 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d7c0a89a QY |
651 | static uint16_t ipid = 0; |
652 | uint16_t maxdatasize; | |
9d303b37 | 653 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
68b7339a | 654 | #define OSPF_WRITE_IPHL_SHIFT 2 |
d62a17ae | 655 | int pkt_count = 0; |
e1b18df1 CS |
656 | |
657 | #ifdef GNU_LINUX | |
3e300703 | 658 | unsigned char cmsgbuf[64] = {}; |
e7503eab CS |
659 | struct cmsghdr *cm = (struct cmsghdr *)cmsgbuf; |
660 | struct in_pktinfo *pi; | |
e1b18df1 | 661 | #endif |
d62a17ae | 662 | |
663 | ospf->t_write = NULL; | |
718e3744 | 664 | |
d62a17ae | 665 | node = listhead(ospf->oi_write_q); |
666 | assert(node); | |
667 | oi = listgetdata(node); | |
668 | assert(oi); | |
0bfeca3f | 669 | |
670 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
d62a17ae | 671 | /* seed ipid static with low order bits of time */ |
672 | if (ipid == 0) | |
673 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 674 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
675 | ||
d62a17ae | 676 | while ((pkt_count < ospf->write_oi_count) && oi |
677 | && (last_serviced_oi != oi)) { | |
678 | /* If there is only packet in the queue, the oi is removed from | |
679 | write-q, so fix up the last interface that was serviced */ | |
680 | if (last_serviced_oi == NULL) { | |
681 | last_serviced_oi = oi; | |
682 | } | |
683 | pkt_count++; | |
233cc0fb | 684 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 685 | /* convenience - max OSPF data per packet */ |
686 | maxdatasize = oi->ifp->mtu - sizeof(struct ip); | |
233cc0fb | 687 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
d62a17ae | 688 | /* Get one packet from queue. */ |
689 | op = ospf_fifo_head(oi->obuf); | |
690 | assert(op); | |
691 | assert(op->length >= OSPF_HEADER_SIZE); | |
692 | ||
693 | if (op->dst.s_addr == htonl(OSPF_ALLSPFROUTERS) | |
694 | || op->dst.s_addr == htonl(OSPF_ALLDROUTERS)) | |
695 | ospf_if_ipmulticast(ospf, oi->address, | |
696 | oi->ifp->ifindex); | |
697 | ||
698 | /* Rewrite the md5 signature & update the seq */ | |
699 | ospf_make_md5_digest(oi, op); | |
700 | ||
701 | /* Retrieve OSPF packet type. */ | |
702 | stream_set_getp(op->s, 1); | |
703 | type = stream_getc(op->s); | |
704 | ||
705 | /* reset get pointer */ | |
706 | stream_set_getp(op->s, 0); | |
707 | ||
708 | memset(&iph, 0, sizeof(struct ip)); | |
709 | memset(&sa_dst, 0, sizeof(sa_dst)); | |
710 | ||
711 | sa_dst.sin_family = AF_INET; | |
6f0e3f6e | 712 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 713 | sa_dst.sin_len = sizeof(sa_dst); |
6f0e3f6e | 714 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
d62a17ae | 715 | sa_dst.sin_addr = op->dst; |
716 | sa_dst.sin_port = htons(0); | |
717 | ||
718 | /* Set DONTROUTE flag if dst is unicast. */ | |
719 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
720 | if (!IN_MULTICAST(htonl(op->dst.s_addr))) | |
721 | flags = MSG_DONTROUTE; | |
722 | ||
723 | iph.ip_hl = sizeof(struct ip) >> OSPF_WRITE_IPHL_SHIFT; | |
724 | /* it'd be very strange for header to not be 4byte-word aligned | |
725 | * but.. */ | |
726 | if (sizeof(struct ip) | |
727 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT)) | |
728 | iph.ip_hl++; /* we presume sizeof struct ip cant | |
729 | overflow ip_hl.. */ | |
730 | ||
731 | iph.ip_v = IPVERSION; | |
732 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; | |
733 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; | |
68b7339a | 734 | |
0150c9c9 | 735 | #if defined(__DragonFly__) |
d62a17ae | 736 | /* |
737 | * DragonFly's raw socket expects ip_len/ip_off in network byte | |
738 | * order. | |
739 | */ | |
740 | iph.ip_len = htons(iph.ip_len); | |
0150c9c9 DB |
741 | #endif |
742 | ||
0bfeca3f | 743 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 744 | /* XXX-MT: not thread-safe at all.. |
745 | * XXX: this presumes this is only programme sending OSPF | |
746 | * packets | |
747 | * otherwise, no guarantee ipid will be unique | |
748 | */ | |
749 | iph.ip_id = ++ipid; | |
0bfeca3f | 750 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
751 | ||
d62a17ae | 752 | iph.ip_off = 0; |
753 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
754 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
755 | else | |
756 | iph.ip_ttl = OSPF_IP_TTL; | |
757 | iph.ip_p = IPPROTO_OSPFIGP; | |
758 | iph.ip_sum = 0; | |
759 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
760 | iph.ip_dst.s_addr = op->dst.s_addr; | |
761 | ||
762 | memset(&msg, 0, sizeof(msg)); | |
763 | msg.msg_name = (caddr_t)&sa_dst; | |
764 | msg.msg_namelen = sizeof(sa_dst); | |
765 | msg.msg_iov = iov; | |
766 | msg.msg_iovlen = 2; | |
e7503eab | 767 | |
d62a17ae | 768 | iov[0].iov_base = (char *)&iph; |
769 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; | |
2d34fb80 | 770 | iov[1].iov_base = stream_pnt(op->s); |
d62a17ae | 771 | iov[1].iov_len = op->length; |
772 | ||
e1b18df1 CS |
773 | #ifdef GNU_LINUX |
774 | msg.msg_control = (caddr_t)cm; | |
e7503eab CS |
775 | cm->cmsg_level = SOL_IP; |
776 | cm->cmsg_type = IP_PKTINFO; | |
777 | cm->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
778 | pi = (struct in_pktinfo *)CMSG_DATA(cm); | |
779 | pi->ipi_ifindex = oi->ifp->ifindex; | |
780 | ||
781 | msg.msg_controllen = cm->cmsg_len; | |
e1b18df1 | 782 | #endif |
e7503eab | 783 | |
996c9314 LB |
784 | /* Sadly we can not rely on kernels to fragment packets |
785 | * because of either IP_HDRINCL and/or multicast | |
786 | * destination being set. | |
787 | */ | |
e7503eab | 788 | |
0bfeca3f | 789 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 790 | if (op->length > maxdatasize) |
791 | ospf_write_frags(ospf->fd, op, &iph, &msg, maxdatasize, | |
792 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 793 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 794 | |
d62a17ae | 795 | /* send final fragment (could be first) */ |
796 | sockopt_iphdrincl_swab_htosys(&iph); | |
797 | ret = sendmsg(ospf->fd, &msg, flags); | |
798 | sockopt_iphdrincl_swab_systoh(&iph); | |
799 | if (IS_DEBUG_OSPF_EVENT) | |
800 | zlog_debug( | |
801 | "ospf_write to %s, " | |
802 | "id %d, off %d, len %d, interface %s, mtu %u:", | |
803 | inet_ntoa(iph.ip_dst), iph.ip_id, iph.ip_off, | |
804 | iph.ip_len, oi->ifp->name, oi->ifp->mtu); | |
805 | ||
806 | if (ret < 0) | |
c9cc11f6 | 807 | flog_err( |
450971aa | 808 | EC_LIB_SOCKET, |
d62a17ae | 809 | "*** sendmsg in ospf_write failed to %s, " |
810 | "id %d, off %d, len %d, interface %s, mtu %u: %s", | |
811 | inet_ntoa(iph.ip_dst), iph.ip_id, iph.ip_off, | |
812 | iph.ip_len, oi->ifp->name, oi->ifp->mtu, | |
813 | safe_strerror(errno)); | |
814 | ||
815 | /* Show debug sending packet. */ | |
816 | if (IS_DEBUG_OSPF_PACKET(type - 1, SEND)) { | |
817 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) { | |
818 | zlog_debug( | |
819 | "-----------------------------------------------------"); | |
820 | ospf_ip_header_dump(&iph); | |
821 | stream_set_getp(op->s, 0); | |
822 | ospf_packet_dump(op->s); | |
823 | } | |
824 | ||
825 | zlog_debug("%s sent to [%s] via [%s].", | |
826 | lookup_msg(ospf_packet_type_str, type, NULL), | |
827 | inet_ntoa(op->dst), IF_NAME(oi)); | |
828 | ||
829 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) | |
830 | zlog_debug( | |
831 | "-----------------------------------------------------"); | |
832 | } | |
833 | ||
c9339663 | 834 | switch (type) { |
996c9314 LB |
835 | case OSPF_MSG_HELLO: |
836 | oi->hello_out++; | |
837 | break; | |
838 | case OSPF_MSG_DB_DESC: | |
839 | oi->db_desc_out++; | |
840 | break; | |
841 | case OSPF_MSG_LS_REQ: | |
842 | oi->ls_req_out++; | |
843 | break; | |
844 | case OSPF_MSG_LS_UPD: | |
845 | oi->ls_upd_out++; | |
846 | break; | |
847 | case OSPF_MSG_LS_ACK: | |
848 | oi->ls_ack_out++; | |
849 | break; | |
850 | default: | |
851 | break; | |
c9339663 CS |
852 | } |
853 | ||
d62a17ae | 854 | /* Now delete packet from queue. */ |
855 | ospf_packet_delete(oi); | |
856 | ||
857 | /* Move this interface to the tail of write_q to | |
858 | serve everyone in a round robin fashion */ | |
859 | list_delete_node(ospf->oi_write_q, node); | |
860 | if (ospf_fifo_head(oi->obuf) == NULL) { | |
861 | oi->on_write_q = 0; | |
862 | last_serviced_oi = NULL; | |
863 | oi = NULL; | |
864 | } else { | |
865 | listnode_add(ospf->oi_write_q, oi); | |
e8f45e82 | 866 | } |
d62a17ae | 867 | |
868 | /* Setup to service from the head of the queue again */ | |
869 | if (!list_isempty(ospf->oi_write_q)) { | |
870 | node = listhead(ospf->oi_write_q); | |
871 | assert(node); | |
872 | oi = listgetdata(node); | |
873 | assert(oi); | |
874 | } | |
875 | } | |
876 | ||
877 | /* If packets still remain in queue, call write thread. */ | |
4bb420ab | 878 | if (!list_isempty(ospf->oi_write_q)) |
d62a17ae | 879 | thread_add_write(master, ospf_write, ospf, ospf->fd, |
880 | &ospf->t_write); | |
718e3744 | 881 | |
d62a17ae | 882 | return 0; |
718e3744 | 883 | } |
884 | ||
885 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
d62a17ae | 886 | static void ospf_hello(struct ip *iph, struct ospf_header *ospfh, |
887 | struct stream *s, struct ospf_interface *oi, int size) | |
888 | { | |
889 | struct ospf_hello *hello; | |
890 | struct ospf_neighbor *nbr; | |
891 | int old_state; | |
892 | struct prefix p; | |
893 | ||
894 | /* increment statistics. */ | |
895 | oi->hello_in++; | |
896 | ||
2d34fb80 | 897 | hello = (struct ospf_hello *)stream_pnt(s); |
d62a17ae | 898 | |
899 | /* If Hello is myself, silently discard. */ | |
900 | if (IPV4_ADDR_SAME(&ospfh->router_id, &oi->ospf->router_id)) { | |
901 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) { | |
902 | zlog_debug( | |
903 | "ospf_header[%s/%s]: selforiginated, " | |
904 | "dropping.", | |
905 | lookup_msg(ospf_packet_type_str, ospfh->type, | |
906 | NULL), | |
907 | inet_ntoa(iph->ip_src)); | |
908 | } | |
909 | return; | |
910 | } | |
911 | ||
912 | /* get neighbor prefix. */ | |
913 | p.family = AF_INET; | |
914 | p.prefixlen = ip_masklen(hello->network_mask); | |
915 | p.u.prefix4 = iph->ip_src; | |
916 | ||
917 | /* Compare network mask. */ | |
918 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
919 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
920 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
921 | if (oi->address->prefixlen != p.prefixlen) { | |
c9cc11f6 | 922 | flog_warn( |
cf444bcf | 923 | EC_OSPF_PACKET, |
d62a17ae | 924 | "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).", |
925 | inet_ntoa(ospfh->router_id), IF_NAME(oi), | |
926 | (int)oi->address->prefixlen, (int)p.prefixlen); | |
927 | return; | |
928 | } | |
929 | ||
930 | /* Compare Router Dead Interval. */ | |
931 | if (OSPF_IF_PARAM(oi, v_wait) != ntohl(hello->dead_interval)) { | |
cf444bcf | 932 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 DS |
933 | "Packet %s [Hello:RECV]: RouterDeadInterval mismatch " |
934 | "(expected %u, but received %u).", | |
935 | inet_ntoa(ospfh->router_id), | |
936 | OSPF_IF_PARAM(oi, v_wait), | |
937 | ntohl(hello->dead_interval)); | |
d62a17ae | 938 | return; |
939 | } | |
940 | ||
941 | /* Compare Hello Interval - ignored if fast-hellos are set. */ | |
942 | if (OSPF_IF_PARAM(oi, fast_hello) == 0) { | |
943 | if (OSPF_IF_PARAM(oi, v_hello) | |
944 | != ntohs(hello->hello_interval)) { | |
c9cc11f6 | 945 | flog_warn( |
cf444bcf | 946 | EC_OSPF_PACKET, |
d62a17ae | 947 | "Packet %s [Hello:RECV]: HelloInterval mismatch " |
948 | "(expected %u, but received %u).", | |
949 | inet_ntoa(ospfh->router_id), | |
950 | OSPF_IF_PARAM(oi, v_hello), | |
951 | ntohs(hello->hello_interval)); | |
952 | return; | |
953 | } | |
954 | } | |
955 | ||
956 | if (IS_DEBUG_OSPF_EVENT) | |
b5a8894d | 957 | zlog_debug("Packet %s [Hello:RECV]: Options %s vrf %s", |
d62a17ae | 958 | inet_ntoa(ospfh->router_id), |
b5a8894d CS |
959 | ospf_options_dump(hello->options), |
960 | ospf_vrf_id_to_name(oi->ospf->vrf_id)); | |
d62a17ae | 961 | |
962 | /* Compare options. */ | |
718e3744 | 963 | #define REJECT_IF_TBIT_ON 1 /* XXX */ |
964 | #ifdef REJECT_IF_TBIT_ON | |
d62a17ae | 965 | if (CHECK_FLAG(hello->options, OSPF_OPTION_MT)) { |
966 | /* | |
967 | * This router does not support non-zero TOS. | |
968 | * Drop this Hello packet not to establish neighbor | |
969 | * relationship. | |
970 | */ | |
cf444bcf | 971 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 972 | "Packet %s [Hello:RECV]: T-bit on, drop it.", |
d62a17ae | 973 | inet_ntoa(ospfh->router_id)); |
974 | return; | |
975 | } | |
718e3744 | 976 | #endif /* REJECT_IF_TBIT_ON */ |
977 | ||
d62a17ae | 978 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
979 | && CHECK_FLAG(hello->options, OSPF_OPTION_O)) { | |
980 | /* | |
981 | * This router does know the correct usage of O-bit | |
982 | * the bit should be set in DD packet only. | |
983 | */ | |
cf444bcf | 984 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 985 | "Packet %s [Hello:RECV]: O-bit abuse?", |
d62a17ae | 986 | inet_ntoa(ospfh->router_id)); |
718e3744 | 987 | #ifdef STRICT_OBIT_USAGE_CHECK |
d62a17ae | 988 | return; /* Reject this packet. */ |
989 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
990 | UNSET_FLAG(hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
991 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
992 | } | |
718e3744 | 993 | |
d62a17ae | 994 | /* new for NSSA is to ensure that NP is on and E is off */ |
995 | ||
996 | if (oi->area->external_routing == OSPF_AREA_NSSA) { | |
997 | if (!(CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_NP) | |
998 | && CHECK_FLAG(hello->options, OSPF_OPTION_NP) | |
999 | && !CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_E) | |
1000 | && !CHECK_FLAG(hello->options, OSPF_OPTION_E))) { | |
c9cc11f6 | 1001 | flog_warn( |
cf444bcf | 1002 | EC_OSPF_PACKET, |
d62a17ae | 1003 | "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", |
1004 | inet_ntoa(ospfh->router_id), OPTIONS(oi), | |
1005 | hello->options); | |
1006 | return; | |
1007 | } | |
1008 | if (IS_DEBUG_OSPF_NSSA) | |
1009 | zlog_debug("NSSA-Hello:RECV:Packet from %s:", | |
1010 | inet_ntoa(ospfh->router_id)); | |
1011 | } else | |
1012 | /* The setting of the E-bit found in the Hello Packet's Options | |
1013 | field must match this area's ExternalRoutingCapability A | |
1014 | mismatch causes processing to stop and the packet to be | |
1015 | dropped. The setting of the rest of the bits in the Hello | |
1016 | Packet's Options field should be ignored. */ | |
1017 | if (CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_E) | |
1018 | != CHECK_FLAG(hello->options, OSPF_OPTION_E)) { | |
c9cc11f6 | 1019 | flog_warn( |
cf444bcf | 1020 | EC_OSPF_PACKET, |
d62a17ae | 1021 | "Packet %s [Hello:RECV]: my options: %x, his options %x", |
1022 | inet_ntoa(ospfh->router_id), OPTIONS(oi), | |
1023 | hello->options); | |
1024 | return; | |
1025 | } | |
718e3744 | 1026 | |
d62a17ae | 1027 | /* get neighbour struct */ |
1028 | nbr = ospf_nbr_get(oi, ospfh, iph, &p); | |
1029 | ||
1030 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
1031 | assert(nbr); | |
1032 | ||
1033 | old_state = nbr->state; | |
1034 | ||
1035 | /* Add event to thread. */ | |
1036 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1037 | ||
1038 | /* RFC2328 Section 9.5.1 | |
1039 | If the router is not eligible to become Designated Router, | |
1040 | (snip) It must also send an Hello Packet in reply to an | |
1041 | Hello Packet received from any eligible neighbor (other than | |
1042 | the current Designated Router and Backup Designated Router). */ | |
1043 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1044 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
1045 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
1046 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
1047 | OSPF_NSM_TIMER_ON(nbr->t_hello_reply, | |
1048 | ospf_hello_reply_timer, | |
1049 | OSPF_HELLO_REPLY_DELAY); | |
1050 | ||
1051 | /* on NBMA network type, it happens to receive bidirectional Hello | |
1052 | packet | |
1053 | without advance 1-Way Received event. | |
1054 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
1055 | if (oi->type == OSPF_IFTYPE_NBMA | |
1056 | && (old_state == NSM_Down || old_state == NSM_Attempt)) { | |
1057 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_OneWayReceived); | |
1058 | nbr->priority = hello->priority; | |
1059 | nbr->d_router = hello->d_router; | |
1060 | nbr->bd_router = hello->bd_router; | |
1061 | return; | |
1062 | } | |
1063 | ||
1064 | if (ospf_nbr_bidirectional(&oi->ospf->router_id, hello->neighbors, | |
1065 | size - OSPF_HELLO_MIN_SIZE)) { | |
1066 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_TwoWayReceived); | |
1067 | nbr->options |= hello->options; | |
1068 | } else { | |
1069 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_OneWayReceived); | |
1070 | /* Set neighbor information. */ | |
1071 | nbr->priority = hello->priority; | |
1072 | nbr->d_router = hello->d_router; | |
1073 | nbr->bd_router = hello->bd_router; | |
1074 | return; | |
1075 | } | |
1076 | ||
1077 | /* If neighbor itself declares DR and no BDR exists, | |
1078 | cause event BackupSeen */ | |
1079 | if (IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->d_router)) | |
1080 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
1081 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_BackupSeen); | |
1082 | ||
1083 | /* neighbor itself declares BDR. */ | |
1084 | if (oi->state == ISM_Waiting | |
1085 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->bd_router)) | |
1086 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_BackupSeen); | |
1087 | ||
1088 | /* had not previously. */ | |
1089 | if ((IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->d_router) | |
1090 | && IPV4_ADDR_CMP(&nbr->address.u.prefix4, &nbr->d_router)) | |
1091 | || (IPV4_ADDR_CMP(&nbr->address.u.prefix4, &hello->d_router) | |
1092 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &nbr->d_router))) | |
1093 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1094 | ||
1095 | /* had not previously. */ | |
1096 | if ((IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->bd_router) | |
1097 | && IPV4_ADDR_CMP(&nbr->address.u.prefix4, &nbr->bd_router)) | |
1098 | || (IPV4_ADDR_CMP(&nbr->address.u.prefix4, &hello->bd_router) | |
1099 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &nbr->bd_router))) | |
1100 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1101 | ||
1102 | /* Neighbor priority check. */ | |
1103 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
1104 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1105 | ||
1106 | /* Set neighbor information. */ | |
1107 | nbr->priority = hello->priority; | |
1108 | nbr->d_router = hello->d_router; | |
1109 | nbr->bd_router = hello->bd_router; | |
718e3744 | 1110 | } |
1111 | ||
1112 | /* Save DD flags/options/Seqnum received. */ | |
d62a17ae | 1113 | static void ospf_db_desc_save_current(struct ospf_neighbor *nbr, |
1114 | struct ospf_db_desc *dd) | |
718e3744 | 1115 | { |
d62a17ae | 1116 | nbr->last_recv.flags = dd->flags; |
1117 | nbr->last_recv.options = dd->options; | |
1118 | nbr->last_recv.dd_seqnum = ntohl(dd->dd_seqnum); | |
718e3744 | 1119 | } |
1120 | ||
1121 | /* Process rest of DD packet. */ | |
d62a17ae | 1122 | static void ospf_db_desc_proc(struct stream *s, struct ospf_interface *oi, |
1123 | struct ospf_neighbor *nbr, | |
d7c0a89a | 1124 | struct ospf_db_desc *dd, uint16_t size) |
d62a17ae | 1125 | { |
1126 | struct ospf_lsa *new, *find; | |
1127 | struct lsa_header *lsah; | |
1128 | ||
1129 | stream_forward_getp(s, OSPF_DB_DESC_MIN_SIZE); | |
1130 | for (size -= OSPF_DB_DESC_MIN_SIZE; size >= OSPF_LSA_HEADER_SIZE; | |
1131 | size -= OSPF_LSA_HEADER_SIZE) { | |
2d34fb80 | 1132 | lsah = (struct lsa_header *)stream_pnt(s); |
d62a17ae | 1133 | stream_forward_getp(s, OSPF_LSA_HEADER_SIZE); |
1134 | ||
1135 | /* Unknown LS type. */ | |
1136 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) { | |
cf444bcf | 1137 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1138 | "Packet [DD:RECV]: Unknown LS type %d.", |
d62a17ae | 1139 | lsah->type); |
1140 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1141 | return; | |
1142 | } | |
1143 | ||
1144 | if (IS_OPAQUE_LSA(lsah->type) | |
1145 | && !CHECK_FLAG(nbr->options, OSPF_OPTION_O)) { | |
cf444bcf | 1146 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1147 | "LSA[Type%d:%s]: Opaque capability mismatch?", |
d62a17ae | 1148 | lsah->type, inet_ntoa(lsah->id)); |
1149 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1150 | return; | |
1151 | } | |
1152 | ||
1153 | switch (lsah->type) { | |
1154 | case OSPF_AS_EXTERNAL_LSA: | |
1155 | case OSPF_OPAQUE_AS_LSA: | |
1156 | /* Check for stub area. Reject if AS-External from stub | |
1157 | but | |
1158 | allow if from NSSA. */ | |
1159 | if (oi->area->external_routing == OSPF_AREA_STUB) { | |
c9cc11f6 | 1160 | flog_warn( |
cf444bcf | 1161 | EC_OSPF_PACKET, |
d62a17ae | 1162 | "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", |
1163 | lsah->type, inet_ntoa(lsah->id), | |
1164 | (oi->area->external_routing | |
1165 | == OSPF_AREA_STUB) | |
1166 | ? "STUB" | |
1167 | : "NSSA"); | |
1168 | OSPF_NSM_EVENT_SCHEDULE(nbr, | |
1169 | NSM_SeqNumberMismatch); | |
1170 | return; | |
1171 | } | |
1172 | break; | |
1173 | default: | |
1174 | break; | |
1175 | } | |
1176 | ||
1177 | /* Create LS-request object. */ | |
1178 | new = ospf_ls_request_new(lsah); | |
1179 | ||
1180 | /* Lookup received LSA, then add LS request list. */ | |
1181 | find = ospf_lsa_lookup_by_header(oi->area, lsah); | |
1182 | ||
1183 | /* ospf_lsa_more_recent is fine with NULL pointers */ | |
1184 | switch (ospf_lsa_more_recent(find, new)) { | |
1185 | case -1: | |
1186 | /* Neighbour has a more recent LSA, we must request it | |
1187 | */ | |
1188 | ospf_ls_request_add(nbr, new); | |
1189 | /* fallthru */ | |
1190 | case 0: | |
1191 | /* If we have a copy of this LSA, it's either less | |
1192 | * recent | |
1193 | * and we're requesting it from neighbour (the case | |
1194 | * above), or | |
1195 | * it's as recent and we both have same copy (this | |
1196 | * case). | |
1197 | * | |
1198 | * In neither of these two cases is there any point in | |
1199 | * describing our copy of the LSA to the neighbour in a | |
1200 | * DB-Summary packet, if we're still intending to do so. | |
1201 | * | |
1202 | * See: draft-ogier-ospf-dbex-opt-00.txt, describing the | |
1203 | * backward compatible optimisation to OSPF DB Exchange | |
1204 | * / | |
1205 | * DB Description process implemented here. | |
1206 | */ | |
1207 | if (find) | |
1208 | ospf_lsdb_delete(&nbr->db_sum, find); | |
1209 | ospf_lsa_discard(new); | |
1210 | break; | |
1211 | default: | |
1212 | /* We have the more recent copy, nothing specific to do: | |
1213 | * - no need to request neighbours stale copy | |
1214 | * - must leave DB summary list copy alone | |
1215 | */ | |
1216 | if (IS_DEBUG_OSPF_EVENT) | |
1217 | zlog_debug( | |
1218 | "Packet [DD:RECV]: LSA received Type %d, " | |
1219 | "ID %s is not recent.", | |
1220 | lsah->type, inet_ntoa(lsah->id)); | |
1221 | ospf_lsa_discard(new); | |
1222 | } | |
1223 | } | |
1224 | ||
1225 | /* Master */ | |
1226 | if (IS_SET_DD_MS(nbr->dd_flags)) { | |
1227 | nbr->dd_seqnum++; | |
1228 | ||
1229 | /* Both sides have no More, then we're done with Exchange */ | |
1230 | if (!IS_SET_DD_M(dd->flags) && !IS_SET_DD_M(nbr->dd_flags)) | |
1231 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_ExchangeDone); | |
1232 | else | |
1233 | ospf_db_desc_send(nbr); | |
1234 | } | |
1235 | /* Slave */ | |
1236 | else { | |
1237 | nbr->dd_seqnum = ntohl(dd->dd_seqnum); | |
1238 | ||
1239 | /* Send DD packet in reply. | |
1240 | * | |
1241 | * Must be done to acknowledge the Master's DD, regardless of | |
1242 | * whether we have more LSAs ourselves to describe. | |
1243 | * | |
1244 | * This function will clear the 'More' bit, if after this DD | |
1245 | * we have no more LSAs to describe to the master.. | |
1246 | */ | |
1247 | ospf_db_desc_send(nbr); | |
1248 | ||
1249 | /* Slave can raise ExchangeDone now, if master is also done */ | |
1250 | if (!IS_SET_DD_M(dd->flags) && !IS_SET_DD_M(nbr->dd_flags)) | |
1251 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_ExchangeDone); | |
1252 | } | |
1253 | ||
1254 | /* Save received neighbor values from DD. */ | |
1255 | ospf_db_desc_save_current(nbr, dd); | |
1256 | ||
1257 | if (!nbr->t_ls_req) | |
1258 | ospf_ls_req_send(nbr); | |
1259 | } | |
1260 | ||
1261 | static int ospf_db_desc_is_dup(struct ospf_db_desc *dd, | |
1262 | struct ospf_neighbor *nbr) | |
1263 | { | |
1264 | /* Is DD duplicated? */ | |
1265 | if (dd->options == nbr->last_recv.options | |
1266 | && dd->flags == nbr->last_recv.flags | |
1267 | && dd->dd_seqnum == htonl(nbr->last_recv.dd_seqnum)) | |
1268 | return 1; | |
1269 | ||
1270 | return 0; | |
718e3744 | 1271 | } |
1272 | ||
1273 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
d62a17ae | 1274 | static void ospf_db_desc(struct ip *iph, struct ospf_header *ospfh, |
1275 | struct stream *s, struct ospf_interface *oi, | |
d7c0a89a | 1276 | uint16_t size) |
d62a17ae | 1277 | { |
1278 | struct ospf_db_desc *dd; | |
1279 | struct ospf_neighbor *nbr; | |
d363df2c | 1280 | |
d62a17ae | 1281 | /* Increment statistics. */ |
1282 | oi->db_desc_in++; | |
718e3744 | 1283 | |
2d34fb80 | 1284 | dd = (struct ospf_db_desc *)stream_pnt(s); |
d62a17ae | 1285 | |
1286 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1287 | if (nbr == NULL) { | |
cf444bcf | 1288 | flog_warn(EC_OSPF_PACKET, "Packet[DD]: Unknown Neighbor %s", |
d62a17ae | 1289 | inet_ntoa(ospfh->router_id)); |
1290 | return; | |
718e3744 | 1291 | } |
d62a17ae | 1292 | |
1293 | /* Check MTU. */ | |
1294 | if ((OSPF_IF_PARAM(oi, mtu_ignore) == 0) | |
1295 | && (ntohs(dd->mtu) > oi->ifp->mtu)) { | |
c9cc11f6 | 1296 | flog_warn( |
cf444bcf | 1297 | EC_OSPF_PACKET, |
d62a17ae | 1298 | "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", |
1299 | inet_ntoa(nbr->router_id), ntohs(dd->mtu), IF_NAME(oi), | |
1300 | oi->ifp->mtu); | |
1301 | return; | |
718e3744 | 1302 | } |
1303 | ||
d62a17ae | 1304 | /* |
1305 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is | |
1306 | * not | |
1307 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1308 | * Until proper solution is developped, this hack should help. | |
1309 | * | |
1310 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1311 | * options, unfortunately its use in DD options is not specified. Hence | |
1312 | * some | |
1313 | * implementations follow E-bit semantics and set it in DD options, and | |
1314 | * some | |
1315 | * treat it as unspecified and hence follow the directive "default for | |
1316 | * options is clear", ie unset. | |
1317 | * | |
1318 | * Reset the flag, as ospfd follows E-bit semantics. | |
1319 | */ | |
1320 | if ((oi->area->external_routing == OSPF_AREA_NSSA) | |
1321 | && (CHECK_FLAG(nbr->options, OSPF_OPTION_NP)) | |
1322 | && (!CHECK_FLAG(dd->options, OSPF_OPTION_NP))) { | |
1323 | if (IS_DEBUG_OSPF_EVENT) | |
1324 | zlog_debug( | |
1325 | "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", | |
1326 | inet_ntoa(nbr->router_id)); | |
1327 | SET_FLAG(dd->options, OSPF_OPTION_NP); | |
718e3744 | 1328 | } |
1329 | ||
d62a17ae | 1330 | #ifdef REJECT_IF_TBIT_ON |
1331 | if (CHECK_FLAG(dd->options, OSPF_OPTION_MT)) { | |
1332 | /* | |
1333 | * In Hello protocol, optional capability must have checked | |
1334 | * to prevent this T-bit enabled router be my neighbor. | |
1335 | */ | |
1c50c1c0 | 1336 | flog_warn(EC_OSPF_PACKET, "Packet[DD]: Neighbor %s: T-bit on?", |
d62a17ae | 1337 | inet_ntoa(nbr->router_id)); |
1338 | return; | |
1339 | } | |
1340 | #endif /* REJECT_IF_TBIT_ON */ | |
1341 | ||
1342 | if (CHECK_FLAG(dd->options, OSPF_OPTION_O) | |
1343 | && !CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) { | |
1344 | /* | |
1345 | * This node is not configured to handle O-bit, for now. | |
1346 | * Clear it to ignore unsupported capability proposed by | |
1347 | * neighbor. | |
1348 | */ | |
1349 | UNSET_FLAG(dd->options, OSPF_OPTION_O); | |
1350 | } | |
1351 | ||
1352 | /* Add event to thread. */ | |
1353 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1354 | ||
1355 | /* Process DD packet by neighbor status. */ | |
1356 | switch (nbr->state) { | |
1357 | case NSM_Down: | |
1358 | case NSM_Attempt: | |
1359 | case NSM_TwoWay: | |
c9cc11f6 | 1360 | flog_warn( |
cf444bcf | 1361 | EC_OSPF_PACKET, |
d62a17ae | 1362 | "Packet[DD]: Neighbor %s state is %s, packet discarded.", |
1363 | inet_ntoa(nbr->router_id), | |
1364 | lookup_msg(ospf_nsm_state_msg, nbr->state, NULL)); | |
1365 | break; | |
1366 | case NSM_Init: | |
1367 | OSPF_NSM_EVENT_EXECUTE(nbr, NSM_TwoWayReceived); | |
1368 | /* If the new state is ExStart, the processing of the current | |
1369 | packet should then continue in this new state by falling | |
1370 | through to case ExStart below. */ | |
1371 | if (nbr->state != NSM_ExStart) | |
1372 | break; | |
1373 | /* fallthru */ | |
1374 | case NSM_ExStart: | |
1375 | /* Initial DBD */ | |
1376 | if ((IS_SET_DD_ALL(dd->flags) == OSPF_DD_FLAG_ALL) | |
1377 | && (size == OSPF_DB_DESC_MIN_SIZE)) { | |
1378 | if (IPV4_ADDR_CMP(&nbr->router_id, &oi->ospf->router_id) | |
1379 | > 0) { | |
1380 | /* We're Slave---obey */ | |
05ba78e4 CS |
1381 | if (CHECK_FLAG(oi->ospf->config, |
1382 | OSPF_LOG_ADJACENCY_DETAIL)) | |
996c9314 LB |
1383 | zlog_info( |
1384 | "Packet[DD]: Neighbor %s Negotiation done (Slave).", | |
1385 | inet_ntoa(nbr->router_id)); | |
05ba78e4 | 1386 | |
d62a17ae | 1387 | nbr->dd_seqnum = ntohl(dd->dd_seqnum); |
1388 | ||
1389 | /* Reset I/MS */ | |
1390 | UNSET_FLAG(nbr->dd_flags, | |
1391 | (OSPF_DD_FLAG_MS | OSPF_DD_FLAG_I)); | |
1392 | } else { | |
1393 | /* We're Master, ignore the initial DBD from | |
1394 | * Slave */ | |
05ba78e4 CS |
1395 | if (CHECK_FLAG(oi->ospf->config, |
1396 | OSPF_LOG_ADJACENCY_DETAIL)) | |
1397 | zlog_info( | |
1398 | "Packet[DD]: Neighbor %s: Initial DBD from Slave, " | |
1399 | "ignoring.", | |
1400 | inet_ntoa(nbr->router_id)); | |
d62a17ae | 1401 | break; |
1402 | } | |
1403 | } | |
1404 | /* Ack from the Slave */ | |
1405 | else if (!IS_SET_DD_MS(dd->flags) && !IS_SET_DD_I(dd->flags) | |
1406 | && ntohl(dd->dd_seqnum) == nbr->dd_seqnum | |
1407 | && IPV4_ADDR_CMP(&nbr->router_id, &oi->ospf->router_id) | |
1408 | < 0) { | |
1409 | zlog_info( | |
1410 | "Packet[DD]: Neighbor %s Negotiation done (Master).", | |
1411 | inet_ntoa(nbr->router_id)); | |
1412 | /* Reset I, leaving MS */ | |
1413 | UNSET_FLAG(nbr->dd_flags, OSPF_DD_FLAG_I); | |
1414 | } else { | |
cf444bcf | 1415 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1416 | "Packet[DD]: Neighbor %s Negotiation fails.", |
d62a17ae | 1417 | inet_ntoa(nbr->router_id)); |
1418 | break; | |
1419 | } | |
1420 | ||
1421 | /* This is where the real Options are saved */ | |
1422 | nbr->options = dd->options; | |
1423 | ||
1424 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) { | |
1425 | if (IS_DEBUG_OSPF_EVENT) | |
1426 | zlog_debug( | |
1427 | "Neighbor[%s] is %sOpaque-capable.", | |
1428 | inet_ntoa(nbr->router_id), | |
1429 | CHECK_FLAG(nbr->options, OSPF_OPTION_O) | |
1430 | ? "" | |
1431 | : "NOT "); | |
1432 | ||
1433 | if (!CHECK_FLAG(nbr->options, OSPF_OPTION_O) | |
1434 | && IPV4_ADDR_SAME(&DR(oi), | |
1435 | &nbr->address.u.prefix4)) { | |
c9cc11f6 | 1436 | flog_warn( |
cf444bcf | 1437 | EC_OSPF_PACKET, |
c9cc11f6 | 1438 | "DR-neighbor[%s] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.", |
d62a17ae | 1439 | inet_ntoa(nbr->router_id)); |
1440 | /* This situation is undesirable, but not a real | |
1441 | * error. */ | |
1442 | } | |
1443 | } | |
1444 | ||
1445 | OSPF_NSM_EVENT_EXECUTE(nbr, NSM_NegotiationDone); | |
1446 | ||
1447 | /* continue processing rest of packet. */ | |
1448 | ospf_db_desc_proc(s, oi, nbr, dd, size); | |
1449 | break; | |
1450 | case NSM_Exchange: | |
1451 | if (ospf_db_desc_is_dup(dd, nbr)) { | |
1452 | if (IS_SET_DD_MS(nbr->dd_flags)) | |
1453 | /* Master: discard duplicated DD packet. */ | |
1454 | zlog_info( | |
1455 | "Packet[DD] (Master): Neighbor %s packet duplicated.", | |
1456 | inet_ntoa(nbr->router_id)); | |
1457 | else | |
1458 | /* Slave: cause to retransmit the last Database | |
1459 | Description. */ | |
1460 | { | |
1461 | zlog_info( | |
1462 | "Packet[DD] [Slave]: Neighbor %s packet duplicated.", | |
1463 | inet_ntoa(nbr->router_id)); | |
1464 | ospf_db_desc_resend(nbr); | |
1465 | } | |
1466 | break; | |
1467 | } | |
1468 | ||
1469 | /* Otherwise DD packet should be checked. */ | |
1470 | /* Check Master/Slave bit mismatch */ | |
1471 | if (IS_SET_DD_MS(dd->flags) | |
1472 | != IS_SET_DD_MS(nbr->last_recv.flags)) { | |
cf444bcf | 1473 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1474 | "Packet[DD]: Neighbor %s MS-bit mismatch.", |
d62a17ae | 1475 | inet_ntoa(nbr->router_id)); |
1476 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1477 | if (IS_DEBUG_OSPF_EVENT) | |
1478 | zlog_debug( | |
1479 | "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", | |
1480 | dd->flags, nbr->dd_flags); | |
1481 | break; | |
1482 | } | |
1483 | ||
1484 | /* Check initialize bit is set. */ | |
1485 | if (IS_SET_DD_I(dd->flags)) { | |
1486 | zlog_info("Packet[DD]: Neighbor %s I-bit set.", | |
1487 | inet_ntoa(nbr->router_id)); | |
1488 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1489 | break; | |
1490 | } | |
1491 | ||
1492 | /* Check DD Options. */ | |
1493 | if (dd->options != nbr->options) { | |
718e3744 | 1494 | #ifdef ORIGINAL_CODING |
d62a17ae | 1495 | /* Save the new options for debugging */ |
1496 | nbr->options = dd->options; | |
718e3744 | 1497 | #endif /* ORIGINAL_CODING */ |
cf444bcf | 1498 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1499 | "Packet[DD]: Neighbor %s options mismatch.", |
d62a17ae | 1500 | inet_ntoa(nbr->router_id)); |
1501 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1502 | break; | |
1503 | } | |
718e3744 | 1504 | |
d62a17ae | 1505 | /* Check DD sequence number. */ |
1506 | if ((IS_SET_DD_MS(nbr->dd_flags) | |
1507 | && ntohl(dd->dd_seqnum) != nbr->dd_seqnum) | |
1508 | || (!IS_SET_DD_MS(nbr->dd_flags) | |
1509 | && ntohl(dd->dd_seqnum) != nbr->dd_seqnum + 1)) { | |
c9cc11f6 | 1510 | flog_warn( |
cf444bcf | 1511 | EC_OSPF_PACKET, |
d62a17ae | 1512 | "Packet[DD]: Neighbor %s sequence number mismatch.", |
1513 | inet_ntoa(nbr->router_id)); | |
1514 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1515 | break; | |
1516 | } | |
1517 | ||
1518 | /* Continue processing rest of packet. */ | |
1519 | ospf_db_desc_proc(s, oi, nbr, dd, size); | |
1520 | break; | |
1521 | case NSM_Loading: | |
1522 | case NSM_Full: | |
1523 | if (ospf_db_desc_is_dup(dd, nbr)) { | |
1524 | if (IS_SET_DD_MS(nbr->dd_flags)) { | |
1525 | /* Master should discard duplicate DD packet. */ | |
1526 | zlog_info( | |
1527 | "Packet[DD]: Neighbor %s duplicated, " | |
1528 | "packet discarded.", | |
1529 | inet_ntoa(nbr->router_id)); | |
1530 | break; | |
1531 | } else { | |
1532 | if (monotime_since(&nbr->last_send_ts, NULL) | |
1533 | < nbr->v_inactivity * 1000000LL) { | |
1534 | /* In states Loading and Full the slave | |
1535 | must resend | |
1536 | its last Database Description packet | |
1537 | in response to | |
1538 | duplicate Database Description | |
1539 | packets received | |
1540 | from the master. For this reason the | |
1541 | slave must | |
1542 | wait RouterDeadInterval seconds | |
1543 | before freeing the | |
1544 | last Database Description packet. | |
1545 | Reception of a | |
1546 | Database Description packet from the | |
1547 | master after | |
1548 | this interval will generate a | |
1549 | SeqNumberMismatch | |
1550 | neighbor event. RFC2328 Section 10.8 | |
1551 | */ | |
1552 | ospf_db_desc_resend(nbr); | |
1553 | break; | |
1554 | } | |
1555 | } | |
718e3744 | 1556 | } |
718e3744 | 1557 | |
d62a17ae | 1558 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); |
1559 | break; | |
1560 | default: | |
cf444bcf | 1561 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1562 | "Packet[DD]: Neighbor %s NSM illegal status %u.", |
d62a17ae | 1563 | inet_ntoa(nbr->router_id), nbr->state); |
1564 | break; | |
1565 | } | |
718e3744 | 1566 | } |
1567 | ||
1568 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1569 | ||
1570 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
d62a17ae | 1571 | static void ospf_ls_req(struct ip *iph, struct ospf_header *ospfh, |
1572 | struct stream *s, struct ospf_interface *oi, | |
d7c0a89a | 1573 | uint16_t size) |
d62a17ae | 1574 | { |
1575 | struct ospf_neighbor *nbr; | |
d7c0a89a | 1576 | uint32_t ls_type; |
d62a17ae | 1577 | struct in_addr ls_id; |
1578 | struct in_addr adv_router; | |
1579 | struct ospf_lsa *find; | |
1580 | struct list *ls_upd; | |
1581 | unsigned int length; | |
1582 | ||
1583 | /* Increment statistics. */ | |
1584 | oi->ls_req_in++; | |
1585 | ||
1586 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1587 | if (nbr == NULL) { | |
cf444bcf | 1588 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1589 | "Link State Request: Unknown Neighbor %s.", |
d62a17ae | 1590 | inet_ntoa(ospfh->router_id)); |
1591 | return; | |
718e3744 | 1592 | } |
1593 | ||
d62a17ae | 1594 | /* Add event to thread. */ |
1595 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1596 | ||
1597 | /* Neighbor State should be Exchange or later. */ | |
1598 | if (nbr->state != NSM_Exchange && nbr->state != NSM_Loading | |
1599 | && nbr->state != NSM_Full) { | |
c9cc11f6 | 1600 | flog_warn( |
cf444bcf | 1601 | EC_OSPF_PACKET, |
c9cc11f6 | 1602 | "Link State Request received from %s: Neighbor state is %s, packet discarded.", |
d62a17ae | 1603 | inet_ntoa(ospfh->router_id), |
1604 | lookup_msg(ospf_nsm_state_msg, nbr->state, NULL)); | |
1605 | return; | |
718e3744 | 1606 | } |
1607 | ||
d62a17ae | 1608 | /* Send Link State Update for ALL requested LSAs. */ |
1609 | ls_upd = list_new(); | |
1610 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1611 | ||
1612 | while (size >= OSPF_LSA_KEY_SIZE) { | |
1613 | /* Get one slice of Link State Request. */ | |
1614 | ls_type = stream_getl(s); | |
1615 | ls_id.s_addr = stream_get_ipv4(s); | |
1616 | adv_router.s_addr = stream_get_ipv4(s); | |
1617 | ||
1618 | /* Verify LSA type. */ | |
1619 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) { | |
1620 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
6a154c88 | 1621 | list_delete(&ls_upd); |
d62a17ae | 1622 | return; |
1623 | } | |
718e3744 | 1624 | |
d62a17ae | 1625 | /* Search proper LSA in LSDB. */ |
b5a8894d CS |
1626 | find = ospf_lsa_lookup(oi->ospf, oi->area, ls_type, ls_id, |
1627 | adv_router); | |
d62a17ae | 1628 | if (find == NULL) { |
1629 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
6a154c88 | 1630 | list_delete(&ls_upd); |
d62a17ae | 1631 | return; |
1632 | } | |
718e3744 | 1633 | |
d62a17ae | 1634 | /* Packet overflows MTU size, send immediately. */ |
1635 | if (length + ntohs(find->data->length) > ospf_packet_max(oi)) { | |
1636 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1637 | ospf_ls_upd_send(nbr, ls_upd, | |
046460a1 | 1638 | OSPF_SEND_PACKET_DIRECT, 0); |
d62a17ae | 1639 | else |
1640 | ospf_ls_upd_send(nbr, ls_upd, | |
046460a1 | 1641 | OSPF_SEND_PACKET_INDIRECT, 0); |
d62a17ae | 1642 | |
1643 | /* Only remove list contents. Keep ls_upd. */ | |
1644 | list_delete_all_node(ls_upd); | |
718e3744 | 1645 | |
d62a17ae | 1646 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; |
1647 | } | |
1648 | ||
1649 | /* Append LSA to update list. */ | |
1650 | listnode_add(ls_upd, find); | |
1651 | length += ntohs(find->data->length); | |
718e3744 | 1652 | |
d62a17ae | 1653 | size -= OSPF_LSA_KEY_SIZE; |
1654 | } | |
718e3744 | 1655 | |
d62a17ae | 1656 | /* Send rest of Link State Update. */ |
1657 | if (listcount(ls_upd) > 0) { | |
1658 | if (oi->type == OSPF_IFTYPE_NBMA) | |
996c9314 LB |
1659 | ospf_ls_upd_send(nbr, ls_upd, OSPF_SEND_PACKET_DIRECT, |
1660 | 0); | |
d62a17ae | 1661 | else |
996c9314 LB |
1662 | ospf_ls_upd_send(nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT, |
1663 | 0); | |
718e3744 | 1664 | |
6a154c88 | 1665 | list_delete(&ls_upd); |
d62a17ae | 1666 | } else |
6a154c88 | 1667 | list_delete(&ls_upd); |
718e3744 | 1668 | } |
1669 | ||
1670 | /* Get the list of LSAs from Link State Update packet. | |
1671 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
d62a17ae | 1672 | static struct list *ospf_ls_upd_list_lsa(struct ospf_neighbor *nbr, |
1673 | struct stream *s, | |
1674 | struct ospf_interface *oi, size_t size) | |
1675 | { | |
d7c0a89a QY |
1676 | uint16_t count, sum; |
1677 | uint32_t length; | |
d62a17ae | 1678 | struct lsa_header *lsah; |
1679 | struct ospf_lsa *lsa; | |
1680 | struct list *lsas; | |
1681 | ||
1682 | lsas = list_new(); | |
1683 | ||
1684 | count = stream_getl(s); | |
1685 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1686 | ||
1687 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
1688 | size -= length, stream_forward_getp(s, length), count--) { | |
2d34fb80 | 1689 | lsah = (struct lsa_header *)stream_pnt(s); |
d62a17ae | 1690 | length = ntohs(lsah->length); |
1691 | ||
1692 | if (length > size) { | |
c9cc11f6 | 1693 | flog_warn( |
cf444bcf | 1694 | EC_OSPF_PACKET, |
d62a17ae | 1695 | "Link State Update: LSA length exceeds packet size."); |
1696 | break; | |
1697 | } | |
718e3744 | 1698 | |
d62a17ae | 1699 | /* Validate the LSA's LS checksum. */ |
1700 | sum = lsah->checksum; | |
1701 | if (!ospf_lsa_checksum_valid(lsah)) { | |
1702 | /* (bug #685) more details in a one-line message make it | |
1703 | * possible | |
1704 | * to identify problem source on the one hand and to | |
1705 | * have a better | |
1706 | * chance to compress repeated messages in syslog on the | |
1707 | * other */ | |
c9cc11f6 | 1708 | flog_warn( |
cf444bcf | 1709 | EC_OSPF_PACKET, |
d62a17ae | 1710 | "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s", |
1711 | sum, lsah->checksum, inet_ntoa(lsah->id), | |
1712 | inet_ntoa(nbr->src), inet_ntoa(nbr->router_id), | |
1713 | inet_ntoa(lsah->adv_router)); | |
1714 | continue; | |
1715 | } | |
718e3744 | 1716 | |
d62a17ae | 1717 | /* Examine the LSA's LS type. */ |
1718 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) { | |
cf444bcf | 1719 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1720 | "Link State Update: Unknown LS type %d", |
d62a17ae | 1721 | lsah->type); |
1722 | continue; | |
1723 | } | |
718e3744 | 1724 | |
d62a17ae | 1725 | /* |
1726 | * What if the received LSA's age is greater than MaxAge? | |
1727 | * Treat it as a MaxAge case -- endo. | |
1728 | */ | |
1729 | if (ntohs(lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1730 | lsah->ls_age = htons(OSPF_LSA_MAXAGE); | |
718e3744 | 1731 | |
d62a17ae | 1732 | if (CHECK_FLAG(nbr->options, OSPF_OPTION_O)) { |
1733 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1734 | if ((IS_OPAQUE_LSA(lsah->type) | |
1735 | && !CHECK_FLAG(lsah->options, OSPF_OPTION_O)) | |
1736 | || (!IS_OPAQUE_LSA(lsah->type) | |
1737 | && CHECK_FLAG(lsah->options, OSPF_OPTION_O))) { | |
1738 | /* | |
1739 | * This neighbor must know the exact usage of | |
1740 | * O-bit; | |
1741 | * the bit will be set in Type-9,10,11 LSAs | |
1742 | * only. | |
1743 | */ | |
cf444bcf | 1744 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1745 | "LSA[Type%d:%s]: O-bit abuse?", |
d62a17ae | 1746 | lsah->type, inet_ntoa(lsah->id)); |
1747 | continue; | |
1748 | } | |
1749 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
718e3744 | 1750 | |
d62a17ae | 1751 | /* Do not take in AS External Opaque-LSAs if we are a |
1752 | * stub. */ | |
1753 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1754 | && nbr->oi->area->external_routing | |
1755 | != OSPF_AREA_DEFAULT) { | |
1756 | if (IS_DEBUG_OSPF_EVENT) | |
1757 | zlog_debug( | |
1758 | "LSA[Type%d:%s]: We are a stub, don't take this LSA.", | |
1759 | lsah->type, | |
1760 | inet_ntoa(lsah->id)); | |
1761 | continue; | |
1762 | } | |
1763 | } else if (IS_OPAQUE_LSA(lsah->type)) { | |
cf444bcf | 1764 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1765 | "LSA[Type%d:%s]: Opaque capability mismatch?", |
d62a17ae | 1766 | lsah->type, inet_ntoa(lsah->id)); |
1767 | continue; | |
1768 | } | |
718e3744 | 1769 | |
d62a17ae | 1770 | /* Create OSPF LSA instance. */ |
5b3d4186 | 1771 | lsa = ospf_lsa_new_and_data(length); |
d62a17ae | 1772 | |
b5a8894d | 1773 | lsa->vrf_id = oi->ospf->vrf_id; |
d62a17ae | 1774 | /* We may wish to put some error checking if type NSSA comes in |
1775 | and area not in NSSA mode */ | |
1776 | switch (lsah->type) { | |
1777 | case OSPF_AS_EXTERNAL_LSA: | |
1778 | case OSPF_OPAQUE_AS_LSA: | |
1779 | lsa->area = NULL; | |
1780 | break; | |
1781 | case OSPF_OPAQUE_LINK_LSA: | |
1782 | lsa->oi = oi; /* Remember incoming interface for | |
1783 | flooding control. */ | |
1784 | /* Fallthrough */ | |
1785 | default: | |
1786 | lsa->area = oi->area; | |
1787 | break; | |
1788 | } | |
718e3744 | 1789 | |
d62a17ae | 1790 | memcpy(lsa->data, lsah, length); |
1791 | ||
1792 | if (IS_DEBUG_OSPF_EVENT) | |
1793 | zlog_debug( | |
1794 | "LSA[Type%d:%s]: %p new LSA created with Link State Update", | |
1795 | lsa->data->type, inet_ntoa(lsa->data->id), | |
1796 | (void *)lsa); | |
1797 | listnode_add(lsas, lsa); | |
1798 | } | |
718e3744 | 1799 | |
d62a17ae | 1800 | return lsas; |
718e3744 | 1801 | } |
1802 | ||
1803 | /* Cleanup Update list. */ | |
d62a17ae | 1804 | static void ospf_upd_list_clean(struct list *lsas) |
718e3744 | 1805 | { |
d62a17ae | 1806 | struct listnode *node, *nnode; |
1807 | struct ospf_lsa *lsa; | |
718e3744 | 1808 | |
d62a17ae | 1809 | for (ALL_LIST_ELEMENTS(lsas, node, nnode, lsa)) |
1810 | ospf_lsa_discard(lsa); | |
718e3744 | 1811 | |
6a154c88 | 1812 | list_delete(&lsas); |
718e3744 | 1813 | } |
1814 | ||
1815 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
d62a17ae | 1816 | static void ospf_ls_upd(struct ospf *ospf, struct ip *iph, |
1817 | struct ospf_header *ospfh, struct stream *s, | |
d7c0a89a | 1818 | struct ospf_interface *oi, uint16_t size) |
d62a17ae | 1819 | { |
1820 | struct ospf_neighbor *nbr; | |
1821 | struct list *lsas; | |
1822 | struct listnode *node, *nnode; | |
1823 | struct ospf_lsa *lsa = NULL; | |
1824 | /* unsigned long ls_req_found = 0; */ | |
1825 | ||
1826 | /* Dis-assemble the stream, update each entry, re-encapsulate for | |
1827 | * flooding */ | |
1828 | ||
1829 | /* Increment statistics. */ | |
1830 | oi->ls_upd_in++; | |
1831 | ||
1832 | /* Check neighbor. */ | |
1833 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1834 | if (nbr == NULL) { | |
cf444bcf | 1835 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1836 | "Link State Update: Unknown Neighbor %s on int: %s", |
d62a17ae | 1837 | inet_ntoa(ospfh->router_id), IF_NAME(oi)); |
1838 | return; | |
718e3744 | 1839 | } |
1840 | ||
d62a17ae | 1841 | /* Add event to thread. */ |
1842 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1843 | ||
1844 | /* Check neighbor state. */ | |
1845 | if (nbr->state < NSM_Exchange) { | |
1846 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
1847 | zlog_debug( | |
1848 | "Link State Update: " | |
1849 | "Neighbor[%s] state %s is less than Exchange", | |
1850 | inet_ntoa(ospfh->router_id), | |
1851 | lookup_msg(ospf_nsm_state_msg, nbr->state, | |
1852 | NULL)); | |
1853 | return; | |
1854 | } | |
718e3744 | 1855 | |
d62a17ae | 1856 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages |
1857 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1858 | * of section 13. | |
1859 | */ | |
1860 | lsas = ospf_ls_upd_list_lsa(nbr, s, oi, size); | |
1861 | ||
35955c14 CS |
1862 | if (lsas == NULL) |
1863 | return; | |
d62a17ae | 1864 | #define DISCARD_LSA(L, N) \ |
1865 | { \ | |
1866 | if (IS_DEBUG_OSPF_EVENT) \ | |
1867 | zlog_debug( \ | |
1868 | "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \ | |
1869 | " Type-%d", \ | |
1870 | N, (void *)lsa, (int)lsa->data->type); \ | |
1871 | ospf_lsa_discard(L); \ | |
1872 | continue; \ | |
718e3744 | 1873 | } |
1874 | ||
d62a17ae | 1875 | /* Process each LSA received in the one packet. |
1876 | * | |
1877 | * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding | |
1878 | * text below are from the steps in RFC 2328, Section 13. | |
1879 | */ | |
1880 | for (ALL_LIST_ELEMENTS(lsas, node, nnode, lsa)) { | |
1881 | struct ospf_lsa *ls_ret, *current; | |
1882 | int ret = 1; | |
1883 | ||
1884 | if (IS_DEBUG_OSPF_NSSA) { | |
1885 | char buf1[INET_ADDRSTRLEN]; | |
1886 | char buf2[INET_ADDRSTRLEN]; | |
1887 | char buf3[INET_ADDRSTRLEN]; | |
1888 | ||
1889 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", | |
1890 | lsa->data->type, | |
1891 | inet_ntop(AF_INET, &ospfh->router_id, buf1, | |
1892 | INET_ADDRSTRLEN), | |
1893 | inet_ntop(AF_INET, &lsa->data->id, buf2, | |
1894 | INET_ADDRSTRLEN), | |
1895 | inet_ntop(AF_INET, &lsa->data->adv_router, | |
1896 | buf3, INET_ADDRSTRLEN)); | |
1897 | } | |
718e3744 | 1898 | |
d62a17ae | 1899 | listnode_delete(lsas, |
1900 | lsa); /* We don't need it in list anymore */ | |
1901 | ||
1902 | /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa() | |
1903 | */ | |
1904 | ||
1905 | /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */ | |
1906 | ||
1907 | /* (3) Do not take in AS External LSAs if we are a stub or NSSA. | |
1908 | */ | |
1909 | ||
1910 | /* Do not take in AS NSSA if this neighbor and we are not NSSA | |
1911 | */ | |
1912 | ||
1913 | /* Do take in Type-7's if we are an NSSA */ | |
1914 | ||
1915 | /* If we are also an ABR, later translate them to a Type-5 | |
1916 | * packet */ | |
1917 | ||
1918 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1919 | translate them to a separate Type-5 packet. */ | |
1920 | ||
1921 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1922 | /* Reject from STUB or NSSA */ | |
1923 | if (nbr->oi->area->external_routing | |
1924 | != OSPF_AREA_DEFAULT) { | |
1925 | if (IS_DEBUG_OSPF_NSSA) | |
1926 | zlog_debug( | |
1927 | "Incoming External LSA Discarded: We are NSSA/STUB Area"); | |
1928 | DISCARD_LSA(lsa, 1); | |
1929 | } | |
1930 | ||
1931 | if (lsa->data->type == OSPF_AS_NSSA_LSA) | |
1932 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) { | |
1933 | if (IS_DEBUG_OSPF_NSSA) | |
1934 | zlog_debug( | |
1935 | "Incoming NSSA LSA Discarded: Not NSSA Area"); | |
1936 | DISCARD_LSA(lsa, 2); | |
1937 | } | |
1938 | ||
1939 | /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */ | |
1940 | if (lsa->data->type == OSPF_ROUTER_LSA) | |
1941 | if (!IPV4_ADDR_SAME(&lsa->data->id, | |
1942 | &lsa->data->adv_router)) { | |
1943 | char buf1[INET_ADDRSTRLEN]; | |
1944 | char buf2[INET_ADDRSTRLEN]; | |
1945 | char buf3[INET_ADDRSTRLEN]; | |
1946 | ||
cf444bcf | 1947 | flog_err(EC_OSPF_ROUTER_LSA_MISMATCH, |
1c50c1c0 QY |
1948 | "Incoming Router-LSA from %s with " |
1949 | "Adv-ID[%s] != LS-ID[%s]", | |
1950 | inet_ntop(AF_INET, &ospfh->router_id, | |
1951 | buf1, INET_ADDRSTRLEN), | |
1952 | inet_ntop(AF_INET, &lsa->data->id, | |
1953 | buf2, INET_ADDRSTRLEN), | |
1954 | inet_ntop(AF_INET, | |
1955 | &lsa->data->adv_router, buf3, | |
1956 | INET_ADDRSTRLEN)); | |
af4c2728 | 1957 | flog_err( |
cf444bcf | 1958 | EC_OSPF_DOMAIN_CORRUPT, |
d62a17ae | 1959 | "OSPF domain compromised by attack or corruption. " |
1960 | "Verify correct operation of -ALL- OSPF routers."); | |
1961 | DISCARD_LSA(lsa, 0); | |
1962 | } | |
1963 | ||
1964 | /* Find the LSA in the current database. */ | |
1965 | ||
1966 | current = ospf_lsa_lookup_by_header(oi->area, lsa->data); | |
1967 | ||
1968 | /* (4) If the LSA's LS age is equal to MaxAge, and there is | |
1969 | currently | |
1970 | no instance of the LSA in the router's link state database, | |
1971 | and none of router's neighbors are in states Exchange or | |
1972 | Loading, | |
1973 | then take the following actions: */ | |
1974 | ||
1975 | if (IS_LSA_MAXAGE(lsa) && !current | |
1976 | && ospf_check_nbr_status(oi->ospf)) { | |
1977 | /* (4a) Response Link State Acknowledgment. */ | |
1978 | ospf_ls_ack_send(nbr, lsa); | |
1979 | ||
1980 | /* (4b) Discard LSA. */ | |
1981 | if (IS_DEBUG_OSPF(lsa, LSA)) { | |
1982 | zlog_debug( | |
1983 | "Link State Update[%s]: LS age is equal to MaxAge.", | |
1984 | dump_lsa_key(lsa)); | |
1985 | } | |
1986 | DISCARD_LSA(lsa, 3); | |
1987 | } | |
1988 | ||
1989 | if (IS_OPAQUE_LSA(lsa->data->type) | |
1990 | && IPV4_ADDR_SAME(&lsa->data->adv_router, | |
1991 | &oi->ospf->router_id)) { | |
1992 | /* | |
1993 | * Even if initial flushing seems to be completed, there | |
1994 | * might | |
1995 | * be a case that self-originated LSA with MaxAge still | |
1996 | * remain | |
1997 | * in the routing domain. | |
1998 | * Just send an LSAck message to cease retransmission. | |
1999 | */ | |
2000 | if (IS_LSA_MAXAGE(lsa)) { | |
c9cc11f6 | 2001 | zlog_info("LSA[%s]: Boomerang effect?", |
d62a17ae | 2002 | dump_lsa_key(lsa)); |
2003 | ospf_ls_ack_send(nbr, lsa); | |
2004 | ospf_lsa_discard(lsa); | |
2005 | ||
2006 | if (current != NULL && !IS_LSA_MAXAGE(current)) | |
2007 | ospf_opaque_lsa_refresh_schedule( | |
2008 | current); | |
2009 | continue; | |
2010 | } | |
2011 | ||
2012 | /* | |
2013 | * If an instance of self-originated Opaque-LSA is not | |
2014 | * found | |
2015 | * in the LSDB, there are some possible cases here. | |
2016 | * | |
2017 | * 1) This node lost opaque-capability after restart. | |
2018 | * 2) Else, a part of opaque-type is no more supported. | |
2019 | * 3) Else, a part of opaque-id is no more supported. | |
2020 | * | |
2021 | * Anyway, it is still this node's responsibility to | |
2022 | * flush it. | |
2023 | * Otherwise, the LSA instance remains in the routing | |
2024 | * domain | |
2025 | * until its age reaches to MaxAge. | |
2026 | */ | |
2027 | /* XXX: We should deal with this for *ALL* LSAs, not | |
2028 | * just opaque */ | |
2029 | if (current == NULL) { | |
2030 | if (IS_DEBUG_OSPF_EVENT) | |
2031 | zlog_debug( | |
2032 | "LSA[%s]: Previously originated Opaque-LSA," | |
2033 | "not found in the LSDB.", | |
2034 | dump_lsa_key(lsa)); | |
2035 | ||
2036 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
2037 | ||
2038 | ospf_opaque_self_originated_lsa_received(nbr, | |
2039 | lsa); | |
2040 | ospf_ls_ack_send(nbr, lsa); | |
2041 | ||
2042 | continue; | |
2043 | } | |
2044 | } | |
2045 | ||
2046 | /* It might be happen that received LSA is self-originated | |
2047 | * network LSA, but | |
2048 | * router ID is changed. So, we should check if LSA is a | |
2049 | * network-LSA whose | |
2050 | * Link State ID is one of the router's own IP interface | |
2051 | * addresses but whose | |
2052 | * Advertising Router is not equal to the router's own Router ID | |
2053 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be | |
2054 | * flushed. | |
2055 | */ | |
2056 | ||
2057 | if (lsa->data->type == OSPF_NETWORK_LSA) { | |
2058 | struct listnode *oinode, *oinnode; | |
2059 | struct ospf_interface *out_if; | |
2060 | int Flag = 0; | |
2061 | ||
2062 | for (ALL_LIST_ELEMENTS(oi->ospf->oiflist, oinode, | |
2063 | oinnode, out_if)) { | |
2064 | if (out_if == NULL) | |
2065 | break; | |
2066 | ||
2067 | if ((IPV4_ADDR_SAME(&out_if->address->u.prefix4, | |
2068 | &lsa->data->id)) | |
2069 | && (!(IPV4_ADDR_SAME( | |
2070 | &oi->ospf->router_id, | |
2071 | &lsa->data->adv_router)))) { | |
2072 | if (out_if->network_lsa_self) { | |
2073 | ospf_lsa_flush_area( | |
2074 | lsa, out_if->area); | |
2075 | if (IS_DEBUG_OSPF_EVENT) | |
2076 | zlog_debug( | |
2077 | "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", | |
2078 | (void *)lsa, | |
2079 | (int)lsa->data | |
2080 | ->type); | |
2081 | ospf_lsa_discard(lsa); | |
2082 | Flag = 1; | |
2083 | } | |
2084 | break; | |
2085 | } | |
2086 | } | |
2087 | if (Flag) | |
2088 | continue; | |
2089 | } | |
2090 | ||
2091 | /* (5) Find the instance of this LSA that is currently contained | |
2092 | in the router's link state database. If there is no | |
2093 | database copy, or the received LSA is more recent than | |
2094 | the database copy the following steps must be performed. | |
2095 | (The sub steps from RFC 2328 section 13 step (5) will be | |
2096 | performed in | |
2097 | ospf_flood() ) */ | |
2098 | ||
2099 | if (current == NULL | |
2100 | || (ret = ospf_lsa_more_recent(current, lsa)) < 0) { | |
76c1efd7 CS |
2101 | /* CVE-2017-3224 */ |
2102 | if (current && (lsa->data->ls_seqnum == | |
2103 | htonl(OSPF_MAX_SEQUENCE_NUMBER) | |
2104 | && !IS_LSA_MAXAGE(lsa))) { | |
2105 | zlog_debug( | |
2106 | "Link State Update[%s]: has Max Seq but not MaxAge. Dropping it", | |
2107 | dump_lsa_key(lsa)); | |
2108 | ||
2109 | DISCARD_LSA(lsa, 4); | |
2110 | continue; | |
2111 | } | |
2112 | ||
d62a17ae | 2113 | /* Actual flooding procedure. */ |
2114 | if (ospf_flood(oi->ospf, nbr, current, lsa) | |
2115 | < 0) /* Trap NSSA later. */ | |
76c1efd7 | 2116 | DISCARD_LSA(lsa, 5); |
d62a17ae | 2117 | continue; |
2118 | } | |
2119 | ||
2120 | /* (6) Else, If there is an instance of the LSA on the sending | |
2121 | neighbor's Link state request list, an error has occurred in | |
2122 | the Database Exchange process. In this case, restart the | |
2123 | Database Exchange process by generating the neighbor event | |
2124 | BadLSReq for the sending neighbor and stop processing the | |
2125 | Link State Update packet. */ | |
2126 | ||
2127 | if (ospf_ls_request_lookup(nbr, lsa)) { | |
2128 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
c9cc11f6 | 2129 | flog_warn( |
cf444bcf | 2130 | EC_OSPF_PACKET, |
d62a17ae | 2131 | "LSA[%s] instance exists on Link state request list", |
2132 | dump_lsa_key(lsa)); | |
2133 | ||
2134 | /* Clean list of LSAs. */ | |
2135 | ospf_upd_list_clean(lsas); | |
2136 | /* this lsa is not on lsas list already. */ | |
2137 | ospf_lsa_discard(lsa); | |
2138 | return; | |
2139 | } | |
2140 | ||
2141 | /* If the received LSA is the same instance as the database copy | |
2142 | (i.e., neither one is more recent) the following two steps | |
2143 | should be performed: */ | |
2144 | ||
2145 | if (ret == 0) { | |
2146 | /* If the LSA is listed in the Link state retransmission | |
2147 | list | |
2148 | for the receiving adjacency, the router itself is | |
2149 | expecting | |
2150 | an acknowledgment for this LSA. The router should | |
2151 | treat the | |
2152 | received LSA as an acknowledgment by removing the LSA | |
2153 | from | |
2154 | the Link state retransmission list. This is termed | |
2155 | an | |
2156 | "implied acknowledgment". */ | |
2157 | ||
2158 | ls_ret = ospf_ls_retransmit_lookup(nbr, lsa); | |
2159 | ||
2160 | if (ls_ret != NULL) { | |
2161 | ospf_ls_retransmit_delete(nbr, ls_ret); | |
2162 | ||
2163 | /* Delayed acknowledgment sent if advertisement | |
2164 | received | |
2165 | from Designated Router, otherwise do nothing. | |
2166 | */ | |
2167 | if (oi->state == ISM_Backup) | |
2168 | if (NBR_IS_DR(nbr)) | |
2169 | listnode_add( | |
2170 | oi->ls_ack, | |
2171 | ospf_lsa_lock(lsa)); | |
2172 | ||
76c1efd7 | 2173 | DISCARD_LSA(lsa, 6); |
d62a17ae | 2174 | } else |
2175 | /* Acknowledge the receipt of the LSA by sending a | |
2176 | Link State Acknowledgment packet back out the | |
2177 | receiving | |
2178 | interface. */ | |
2179 | { | |
2180 | ospf_ls_ack_send(nbr, lsa); | |
76c1efd7 | 2181 | DISCARD_LSA(lsa, 7); |
d62a17ae | 2182 | } |
2183 | } | |
2184 | ||
2185 | /* The database copy is more recent. If the database copy | |
2186 | has LS age equal to MaxAge and LS sequence number equal to | |
2187 | MaxSequenceNumber, simply discard the received LSA without | |
2188 | acknowledging it. (In this case, the LSA's LS sequence number | |
2189 | is | |
2190 | wrapping, and the MaxSequenceNumber LSA must be completely | |
2191 | flushed before any new LSA instance can be introduced). */ | |
2192 | ||
2193 | else if (ret > 0) /* Database copy is more recent */ | |
2194 | { | |
2195 | if (IS_LSA_MAXAGE(current) | |
2196 | && current->data->ls_seqnum | |
2197 | == htonl(OSPF_MAX_SEQUENCE_NUMBER)) { | |
76c1efd7 | 2198 | DISCARD_LSA(lsa, 8); |
d62a17ae | 2199 | } |
2200 | /* Otherwise, as long as the database copy has not been | |
2201 | sent in a | |
2202 | Link State Update within the last MinLSArrival | |
2203 | seconds, send the | |
2204 | database copy back to the sending neighbor, | |
2205 | encapsulated within | |
2206 | a Link State Update Packet. The Link State Update | |
2207 | Packet should | |
2208 | be sent directly to the neighbor. In so doing, do not | |
2209 | put the | |
2210 | database copy of the LSA on the neighbor's link state | |
2211 | retransmission list, and do not acknowledge the | |
2212 | received (less | |
2213 | recent) LSA instance. */ | |
2214 | else { | |
2215 | if (monotime_since(¤t->tv_orig, NULL) | |
2216 | >= ospf->min_ls_arrival * 1000LL) | |
2217 | /* Trap NSSA type later.*/ | |
2218 | ospf_ls_upd_send_lsa( | |
2219 | nbr, current, | |
2220 | OSPF_SEND_PACKET_DIRECT); | |
76c1efd7 | 2221 | DISCARD_LSA(lsa, 9); |
d62a17ae | 2222 | } |
2223 | } | |
2224 | } | |
2cd754de PJ |
2225 | #undef DISCARD_LSA |
2226 | ||
d62a17ae | 2227 | assert(listcount(lsas) == 0); |
6a154c88 | 2228 | list_delete(&lsas); |
718e3744 | 2229 | } |
2230 | ||
2231 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
d62a17ae | 2232 | static void ospf_ls_ack(struct ip *iph, struct ospf_header *ospfh, |
2233 | struct stream *s, struct ospf_interface *oi, | |
d7c0a89a | 2234 | uint16_t size) |
d62a17ae | 2235 | { |
2236 | struct ospf_neighbor *nbr; | |
2237 | ||
2238 | /* increment statistics. */ | |
2239 | oi->ls_ack_in++; | |
2240 | ||
2241 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
2242 | if (nbr == NULL) { | |
cf444bcf | 2243 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 2244 | "Link State Acknowledgment: Unknown Neighbor %s.", |
d62a17ae | 2245 | inet_ntoa(ospfh->router_id)); |
2246 | return; | |
2247 | } | |
2248 | ||
2249 | /* Add event to thread. */ | |
2250 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
2251 | ||
2252 | if (nbr->state < NSM_Exchange) { | |
2253 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
2254 | zlog_debug( | |
2255 | "Link State Acknowledgment: " | |
2256 | "Neighbor[%s] state %s is less than Exchange", | |
2257 | inet_ntoa(ospfh->router_id), | |
2258 | lookup_msg(ospf_nsm_state_msg, nbr->state, | |
2259 | NULL)); | |
2260 | return; | |
2261 | } | |
2262 | ||
2263 | while (size >= OSPF_LSA_HEADER_SIZE) { | |
2264 | struct ospf_lsa *lsa, *lsr; | |
2265 | ||
2266 | lsa = ospf_lsa_new(); | |
2d34fb80 | 2267 | lsa->data = (struct lsa_header *)stream_pnt(s); |
b5a8894d | 2268 | lsa->vrf_id = oi->ospf->vrf_id; |
d62a17ae | 2269 | |
2d34fb80 | 2270 | /* lsah = (struct lsa_header *) stream_pnt (s); */ |
d62a17ae | 2271 | size -= OSPF_LSA_HEADER_SIZE; |
2272 | stream_forward_getp(s, OSPF_LSA_HEADER_SIZE); | |
2273 | ||
2274 | if (lsa->data->type < OSPF_MIN_LSA | |
2275 | || lsa->data->type >= OSPF_MAX_LSA) { | |
2276 | lsa->data = NULL; | |
2277 | ospf_lsa_discard(lsa); | |
2278 | continue; | |
2279 | } | |
2280 | ||
2281 | lsr = ospf_ls_retransmit_lookup(nbr, lsa); | |
2282 | ||
2283 | if (lsr != NULL && ospf_lsa_more_recent(lsr, lsa) == 0) | |
2284 | ospf_ls_retransmit_delete(nbr, lsr); | |
2285 | ||
2286 | lsa->data = NULL; | |
2287 | ospf_lsa_discard(lsa); | |
2288 | } | |
2289 | ||
2290 | return; | |
2291 | } | |
2292 | ||
b5a8894d CS |
2293 | static struct stream *ospf_recv_packet(struct ospf *ospf, int fd, |
2294 | struct interface **ifp, | |
d62a17ae | 2295 | struct stream *ibuf) |
2296 | { | |
2297 | int ret; | |
2298 | struct ip *iph; | |
d7c0a89a | 2299 | uint16_t ip_len; |
d62a17ae | 2300 | ifindex_t ifindex = 0; |
2301 | struct iovec iov; | |
2302 | /* Header and data both require alignment. */ | |
2303 | char buff[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; | |
2304 | struct msghdr msgh; | |
2305 | ||
2306 | memset(&msgh, 0, sizeof(struct msghdr)); | |
2307 | msgh.msg_iov = &iov; | |
2308 | msgh.msg_iovlen = 1; | |
2309 | msgh.msg_control = (caddr_t)buff; | |
2310 | msgh.msg_controllen = sizeof(buff); | |
2311 | ||
2312 | ret = stream_recvmsg(ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE + 1); | |
2313 | if (ret < 0) { | |
cf444bcf | 2314 | flog_warn(EC_OSPF_PACKET, "stream_recvmsg failed: %s", |
c9cc11f6 | 2315 | safe_strerror(errno)); |
d62a17ae | 2316 | return NULL; |
2317 | } | |
2318 | if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */ | |
718e3744 | 2319 | { |
c9cc11f6 | 2320 | flog_warn( |
cf444bcf | 2321 | EC_OSPF_PACKET, |
d62a17ae | 2322 | "ospf_recv_packet: discarding runt packet of length %d " |
2323 | "(ip header size is %u)", | |
d7c0a89a | 2324 | ret, (unsigned int)sizeof(iph)); |
d62a17ae | 2325 | return NULL; |
2326 | } | |
2327 | ||
2328 | /* Note that there should not be alignment problems with this assignment | |
2329 | because this is at the beginning of the stream data buffer. */ | |
2330 | iph = (struct ip *)STREAM_DATA(ibuf); | |
2331 | sockopt_iphdrincl_swab_systoh(iph); | |
2332 | ||
2333 | ip_len = iph->ip_len; | |
2334 | ||
de5ccb96 | 2335 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000) |
d62a17ae | 2336 | /* |
2337 | * Kernel network code touches incoming IP header parameters, | |
2338 | * before protocol specific processing. | |
2339 | * | |
2340 | * 1) Convert byteorder to host representation. | |
2341 | * --> ip_len, ip_id, ip_off | |
2342 | * | |
2343 | * 2) Adjust ip_len to strip IP header size! | |
2344 | * --> If user process receives entire IP packet via RAW | |
2345 | * socket, it must consider adding IP header size to | |
2346 | * the "ip_len" field of "ip" structure. | |
2347 | * | |
2348 | * For more details, see <netinet/ip_input.c>. | |
2349 | */ | |
2350 | ip_len = ip_len + (iph->ip_hl << 2); | |
718e3744 | 2351 | #endif |
d62a17ae | 2352 | |
0150c9c9 | 2353 | #if defined(__DragonFly__) |
d62a17ae | 2354 | /* |
2355 | * in DragonFly's raw socket, ip_len/ip_off are read | |
2356 | * in network byte order. | |
2357 | * As OpenBSD < 200311 adjust ip_len to strip IP header size! | |
2358 | */ | |
2359 | ip_len = ntohs(iph->ip_len) + (iph->ip_hl << 2); | |
0150c9c9 DB |
2360 | #endif |
2361 | ||
d62a17ae | 2362 | ifindex = getsockopt_ifindex(AF_INET, &msgh); |
2363 | ||
b5a8894d | 2364 | *ifp = if_lookup_by_index(ifindex, ospf->vrf_id); |
d62a17ae | 2365 | |
2366 | if (ret != ip_len) { | |
c9cc11f6 | 2367 | flog_warn( |
cf444bcf | 2368 | EC_OSPF_PACKET, |
d62a17ae | 2369 | "ospf_recv_packet read length mismatch: ip_len is %d, " |
2370 | "but recvmsg returned %d", | |
2371 | ip_len, ret); | |
2372 | return NULL; | |
2373 | } | |
718e3744 | 2374 | |
d62a17ae | 2375 | return ibuf; |
718e3744 | 2376 | } |
2377 | ||
4dadc291 | 2378 | static struct ospf_interface * |
d62a17ae | 2379 | ospf_associate_packet_vl(struct ospf *ospf, struct interface *ifp, |
2380 | struct ip *iph, struct ospf_header *ospfh) | |
2381 | { | |
2382 | struct ospf_interface *rcv_oi; | |
2383 | struct ospf_vl_data *vl_data; | |
2384 | struct ospf_area *vl_area; | |
2385 | struct listnode *node; | |
2386 | ||
2387 | if (IN_MULTICAST(ntohl(iph->ip_dst.s_addr)) | |
2388 | || !OSPF_IS_AREA_BACKBONE(ospfh)) | |
2389 | return NULL; | |
2390 | ||
2391 | /* look for local OSPF interface matching the destination | |
2392 | * to determine Area ID. We presume therefore the destination address | |
2393 | * is unique, or at least (for "unnumbered" links), not used in other | |
2394 | * areas | |
2395 | */ | |
2396 | if ((rcv_oi = ospf_if_lookup_by_local_addr(ospf, NULL, iph->ip_dst)) | |
2397 | == NULL) | |
2398 | return NULL; | |
2399 | ||
2400 | for (ALL_LIST_ELEMENTS_RO(ospf->vlinks, node, vl_data)) { | |
2401 | vl_area = | |
2402 | ospf_area_lookup_by_area_id(ospf, vl_data->vl_area_id); | |
2403 | if (!vl_area) | |
2404 | continue; | |
2405 | ||
2406 | if (OSPF_AREA_SAME(&vl_area, &rcv_oi->area) | |
2407 | && IPV4_ADDR_SAME(&vl_data->vl_peer, &ospfh->router_id)) { | |
2408 | if (IS_DEBUG_OSPF_EVENT) | |
2409 | zlog_debug("associating packet with %s", | |
2410 | IF_NAME(vl_data->vl_oi)); | |
2411 | if (!CHECK_FLAG(vl_data->vl_oi->ifp->flags, IFF_UP)) { | |
2412 | if (IS_DEBUG_OSPF_EVENT) | |
2413 | zlog_debug( | |
2414 | "This VL is not up yet, sorry"); | |
2415 | return NULL; | |
2416 | } | |
2417 | ||
2418 | return vl_data->vl_oi; | |
2419 | } | |
718e3744 | 2420 | } |
718e3744 | 2421 | |
d62a17ae | 2422 | if (IS_DEBUG_OSPF_EVENT) |
2423 | zlog_debug("couldn't find any VL to associate the packet with"); | |
2424 | ||
2425 | return NULL; | |
718e3744 | 2426 | } |
2427 | ||
d62a17ae | 2428 | static int ospf_check_area_id(struct ospf_interface *oi, |
2429 | struct ospf_header *ospfh) | |
718e3744 | 2430 | { |
d62a17ae | 2431 | /* Check match the Area ID of the receiving interface. */ |
2432 | if (OSPF_AREA_SAME(&oi->area, &ospfh)) | |
2433 | return 1; | |
718e3744 | 2434 | |
d62a17ae | 2435 | return 0; |
718e3744 | 2436 | } |
2437 | ||
2438 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2439 | To prevent it, compare src IP address and i/f address with masking | |
2440 | i/f network mask. */ | |
d62a17ae | 2441 | static int ospf_check_network_mask(struct ospf_interface *oi, |
2442 | struct in_addr ip_src) | |
718e3744 | 2443 | { |
d62a17ae | 2444 | struct in_addr mask, me, him; |
718e3744 | 2445 | |
d62a17ae | 2446 | if (oi->type == OSPF_IFTYPE_POINTOPOINT |
2447 | || oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2448 | return 1; | |
718e3744 | 2449 | |
d62a17ae | 2450 | masklen2ip(oi->address->prefixlen, &mask); |
718e3744 | 2451 | |
d62a17ae | 2452 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; |
2453 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
718e3744 | 2454 | |
d62a17ae | 2455 | if (IPV4_ADDR_SAME(&me, &him)) |
2456 | return 1; | |
718e3744 | 2457 | |
d62a17ae | 2458 | return 0; |
718e3744 | 2459 | } |
2460 | ||
bd5651f0 DO |
2461 | /* Return 1, if the packet is properly authenticated and checksummed, |
2462 | 0 otherwise. In particular, check that AuType header field is valid and | |
2463 | matches the locally configured AuType, and that D.5 requirements are met. */ | |
d62a17ae | 2464 | static int ospf_check_auth(struct ospf_interface *oi, struct ospf_header *ospfh) |
2465 | { | |
2466 | struct crypt_key *ck; | |
d7c0a89a QY |
2467 | uint16_t iface_auth_type; |
2468 | uint16_t pkt_auth_type = ntohs(ospfh->auth_type); | |
d62a17ae | 2469 | |
2470 | switch (pkt_auth_type) { | |
2471 | case OSPF_AUTH_NULL: /* RFC2328 D.5.1 */ | |
2472 | if (OSPF_AUTH_NULL != (iface_auth_type = ospf_auth_type(oi))) { | |
2473 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2474 | flog_warn( |
cf444bcf | 2475 | EC_OSPF_PACKET, |
d62a17ae | 2476 | "interface %s: auth-type mismatch, local %s, rcvd Null", |
2477 | IF_NAME(oi), | |
2478 | lookup_msg(ospf_auth_type_str, | |
2479 | iface_auth_type, NULL)); | |
2480 | return 0; | |
2481 | } | |
2482 | if (!ospf_check_sum(ospfh)) { | |
2483 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2484 | flog_warn( |
cf444bcf | 2485 | EC_OSPF_PACKET, |
d62a17ae | 2486 | "interface %s: Null auth OK, but checksum error, Router-ID %s", |
2487 | IF_NAME(oi), | |
2488 | inet_ntoa(ospfh->router_id)); | |
2489 | return 0; | |
2490 | } | |
2491 | return 1; | |
2492 | case OSPF_AUTH_SIMPLE: /* RFC2328 D.5.2 */ | |
2493 | if (OSPF_AUTH_SIMPLE | |
2494 | != (iface_auth_type = ospf_auth_type(oi))) { | |
2495 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2496 | flog_warn( |
cf444bcf | 2497 | EC_OSPF_PACKET, |
d62a17ae | 2498 | "interface %s: auth-type mismatch, local %s, rcvd Simple", |
2499 | IF_NAME(oi), | |
2500 | lookup_msg(ospf_auth_type_str, | |
2501 | iface_auth_type, NULL)); | |
2502 | return 0; | |
2503 | } | |
2504 | if (memcmp(OSPF_IF_PARAM(oi, auth_simple), ospfh->u.auth_data, | |
2505 | OSPF_AUTH_SIMPLE_SIZE)) { | |
2506 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
cf444bcf | 2507 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 2508 | "interface %s: Simple auth failed", |
d62a17ae | 2509 | IF_NAME(oi)); |
2510 | return 0; | |
2511 | } | |
2512 | if (!ospf_check_sum(ospfh)) { | |
2513 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2514 | flog_warn( |
cf444bcf | 2515 | EC_OSPF_PACKET, |
d62a17ae | 2516 | "interface %s: Simple auth OK, checksum error, Router-ID %s", |
2517 | IF_NAME(oi), | |
2518 | inet_ntoa(ospfh->router_id)); | |
2519 | return 0; | |
2520 | } | |
2521 | return 1; | |
2522 | case OSPF_AUTH_CRYPTOGRAPHIC: /* RFC2328 D.5.3 */ | |
2523 | if (OSPF_AUTH_CRYPTOGRAPHIC | |
2524 | != (iface_auth_type = ospf_auth_type(oi))) { | |
2525 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2526 | flog_warn( |
cf444bcf | 2527 | EC_OSPF_PACKET, |
d62a17ae | 2528 | "interface %s: auth-type mismatch, local %s, rcvd Cryptographic", |
2529 | IF_NAME(oi), | |
2530 | lookup_msg(ospf_auth_type_str, | |
2531 | iface_auth_type, NULL)); | |
2532 | return 0; | |
2533 | } | |
2534 | if (ospfh->checksum) { | |
2535 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2536 | flog_warn( |
cf444bcf | 2537 | EC_OSPF_PACKET, |
d62a17ae | 2538 | "interface %s: OSPF header checksum is not 0", |
2539 | IF_NAME(oi)); | |
2540 | return 0; | |
2541 | } | |
2542 | /* only MD5 crypto method can pass ospf_packet_examin() */ | |
996c9314 LB |
2543 | if (NULL == (ck = listgetdata( |
2544 | listtail(OSPF_IF_PARAM(oi, auth_crypt)))) | |
2545 | || ospfh->u.crypt.key_id != ck->key_id || | |
2546 | /* Condition above uses the last key ID on the list, | |
2547 | which is | |
2548 | different from what ospf_crypt_key_lookup() does. A | |
2549 | bug? */ | |
2550 | !ospf_check_md5_digest(oi, ospfh)) { | |
d62a17ae | 2551 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) |
cf444bcf | 2552 | flog_warn(EC_OSPF_MD5, |
c9cc11f6 | 2553 | "interface %s: MD5 auth failed", |
d62a17ae | 2554 | IF_NAME(oi)); |
2555 | return 0; | |
2556 | } | |
2557 | return 1; | |
2558 | default: | |
2559 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2560 | flog_warn( |
cf444bcf | 2561 | EC_OSPF_PACKET, |
d62a17ae | 2562 | "interface %s: invalid packet auth-type (%02x)", |
2563 | IF_NAME(oi), pkt_auth_type); | |
2564 | return 0; | |
2565 | } | |
2566 | } | |
2567 | ||
2568 | static int ospf_check_sum(struct ospf_header *ospfh) | |
2569 | { | |
d7c0a89a QY |
2570 | uint32_t ret; |
2571 | uint16_t sum; | |
d62a17ae | 2572 | |
2573 | /* clear auth_data for checksum. */ | |
2574 | memset(ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2575 | ||
2576 | /* keep checksum and clear. */ | |
2577 | sum = ospfh->checksum; | |
d7c0a89a | 2578 | memset(&ospfh->checksum, 0, sizeof(uint16_t)); |
d62a17ae | 2579 | |
2580 | /* calculate checksum. */ | |
2581 | ret = in_cksum(ospfh, ntohs(ospfh->length)); | |
2582 | ||
2583 | if (ret != sum) { | |
2584 | zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2585 | ret, sum); | |
2586 | return 0; | |
2587 | } | |
2588 | ||
2589 | return 1; | |
718e3744 | 2590 | } |
2591 | ||
4e31de79 DO |
2592 | /* Verify, that given link/TOS records are properly sized/aligned and match |
2593 | Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */ | |
d62a17ae | 2594 | static unsigned ospf_router_lsa_links_examin(struct router_lsa_link *link, |
d7c0a89a QY |
2595 | uint16_t linkbytes, |
2596 | const uint16_t num_links) | |
d62a17ae | 2597 | { |
2598 | unsigned counted_links = 0, thislinklen; | |
2599 | ||
2600 | while (linkbytes) { | |
2601 | thislinklen = | |
2602 | OSPF_ROUTER_LSA_LINK_SIZE + 4 * link->m[0].tos_count; | |
2603 | if (thislinklen > linkbytes) { | |
2604 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2605 | zlog_debug("%s: length error in link block #%u", | |
2606 | __func__, counted_links); | |
2607 | return MSG_NG; | |
2608 | } | |
2609 | link = (struct router_lsa_link *)((caddr_t)link + thislinklen); | |
2610 | linkbytes -= thislinklen; | |
2611 | counted_links++; | |
2612 | } | |
2613 | if (counted_links != num_links) { | |
2614 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2615 | zlog_debug("%s: %u link blocks declared, %u present", | |
2616 | __func__, num_links, counted_links); | |
2617 | return MSG_NG; | |
2618 | } | |
2619 | return MSG_OK; | |
4e31de79 DO |
2620 | } |
2621 | ||
2622 | /* Verify, that the given LSA is properly sized/aligned (including type-specific | |
2623 | minimum length constraint). */ | |
d7c0a89a QY |
2624 | static unsigned ospf_lsa_examin(struct lsa_header *lsah, const uint16_t lsalen, |
2625 | const uint8_t headeronly) | |
d62a17ae | 2626 | { |
2627 | unsigned ret; | |
2628 | struct router_lsa *rlsa; | |
2629 | if (lsah->type < OSPF_MAX_LSA && ospf_lsa_minlen[lsah->type] | |
2630 | && lsalen < OSPF_LSA_HEADER_SIZE + ospf_lsa_minlen[lsah->type]) { | |
2631 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2632 | zlog_debug("%s: undersized (%u B) %s", __func__, lsalen, | |
2633 | lookup_msg(ospf_lsa_type_msg, lsah->type, | |
2634 | NULL)); | |
2635 | return MSG_NG; | |
2636 | } | |
2637 | switch (lsah->type) { | |
2638 | case OSPF_ROUTER_LSA: | |
2639 | /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1 | |
2640 | * (12+)-byte link blocks */ | |
2641 | if (headeronly) { | |
2642 | ret = (lsalen - OSPF_LSA_HEADER_SIZE | |
2643 | - OSPF_ROUTER_LSA_MIN_SIZE) | |
2644 | % 4 | |
2645 | ? MSG_NG | |
2646 | : MSG_OK; | |
2647 | break; | |
2648 | } | |
2649 | rlsa = (struct router_lsa *)lsah; | |
2650 | ret = ospf_router_lsa_links_examin( | |
2651 | (struct router_lsa_link *)rlsa->link, | |
2652 | lsalen - OSPF_LSA_HEADER_SIZE - 4, /* skip: basic | |
2653 | header, "flags", | |
2654 | 0, "# links" */ | |
2655 | ntohs(rlsa->links) /* 16 bits */ | |
9d303b37 | 2656 | ); |
d62a17ae | 2657 | break; |
2658 | case OSPF_AS_EXTERNAL_LSA: | |
2659 | /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long | |
2660 | * blocks */ | |
2661 | case OSPF_AS_NSSA_LSA: | |
2662 | /* RFC3101 C, idem */ | |
2663 | ret = (lsalen - OSPF_LSA_HEADER_SIZE | |
2664 | - OSPF_AS_EXTERNAL_LSA_MIN_SIZE) | |
2665 | % 12 | |
2666 | ? MSG_NG | |
2667 | : MSG_OK; | |
2668 | break; | |
2669 | /* Following LSA types are considered OK length-wise as soon as their | |
2670 | * minimum | |
2671 | * length constraint is met and length of the whole LSA is a multiple of | |
2672 | * 4 | |
2673 | * (basic LSA header size is already a multiple of 4). */ | |
2674 | case OSPF_NETWORK_LSA: | |
2675 | /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */ | |
2676 | case OSPF_SUMMARY_LSA: | |
2677 | case OSPF_ASBR_SUMMARY_LSA: | |
2678 | /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS | |
2679 | * blocks */ | |
2680 | case OSPF_OPAQUE_LINK_LSA: | |
2681 | case OSPF_OPAQUE_AREA_LSA: | |
2682 | case OSPF_OPAQUE_AS_LSA: | |
2683 | /* RFC5250 A.2, "some number of octets (of application-specific | |
2684 | * data) padded to 32-bit alignment." This is considered | |
2685 | * equivalent | |
2686 | * to 4-byte alignment of all other LSA types, see | |
2687 | * OSPF-ALIGNMENT.txt | |
2688 | * file for the detailed analysis of this passage. */ | |
2689 | ret = lsalen % 4 ? MSG_NG : MSG_OK; | |
2690 | break; | |
2691 | default: | |
2692 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2693 | zlog_debug("%s: unsupported LSA type 0x%02x", __func__, | |
2694 | lsah->type); | |
2695 | return MSG_NG; | |
2696 | } | |
2697 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2698 | zlog_debug("%s: alignment error in %s", __func__, | |
2699 | lookup_msg(ospf_lsa_type_msg, lsah->type, NULL)); | |
2700 | return ret; | |
4e31de79 DO |
2701 | } |
2702 | ||
2703 | /* Verify if the provided input buffer is a valid sequence of LSAs. This | |
2704 | includes verification of LSA blocks length/alignment and dispatching | |
2705 | of deeper-level checks. */ | |
2706 | static unsigned | |
d62a17ae | 2707 | ospf_lsaseq_examin(struct lsa_header *lsah, /* start of buffered data */ |
d7c0a89a | 2708 | size_t length, const uint8_t headeronly, |
d62a17ae | 2709 | /* When declared_num_lsas is not 0, compare it to the real |
2710 | number of LSAs | |
2711 | and treat the difference as an error. */ | |
d7c0a89a | 2712 | const uint32_t declared_num_lsas) |
d62a17ae | 2713 | { |
d7c0a89a | 2714 | uint32_t counted_lsas = 0; |
d62a17ae | 2715 | |
2716 | while (length) { | |
d7c0a89a | 2717 | uint16_t lsalen; |
d62a17ae | 2718 | if (length < OSPF_LSA_HEADER_SIZE) { |
2719 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2720 | zlog_debug( | |
2721 | "%s: undersized (%zu B) trailing (#%u) LSA header", | |
2722 | __func__, length, counted_lsas); | |
2723 | return MSG_NG; | |
2724 | } | |
2725 | /* save on ntohs() calls here and in the LSA validator */ | |
2726 | lsalen = ntohs(lsah->length); | |
2727 | if (lsalen < OSPF_LSA_HEADER_SIZE) { | |
2728 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2729 | zlog_debug( | |
2730 | "%s: malformed LSA header #%u, declared length is %u B", | |
2731 | __func__, counted_lsas, lsalen); | |
2732 | return MSG_NG; | |
2733 | } | |
2734 | if (headeronly) { | |
2735 | /* less checks here and in ospf_lsa_examin() */ | |
2736 | if (MSG_OK != ospf_lsa_examin(lsah, lsalen, 1)) { | |
2737 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2738 | zlog_debug( | |
2739 | "%s: malformed header-only LSA #%u", | |
2740 | __func__, counted_lsas); | |
2741 | return MSG_NG; | |
2742 | } | |
2743 | lsah = (struct lsa_header *)((caddr_t)lsah | |
2744 | + OSPF_LSA_HEADER_SIZE); | |
2745 | length -= OSPF_LSA_HEADER_SIZE; | |
2746 | } else { | |
2747 | /* make sure the input buffer is deep enough before | |
2748 | * further checks */ | |
2749 | if (lsalen > length) { | |
2750 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2751 | zlog_debug( | |
2752 | "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B", | |
2753 | __func__, counted_lsas, lsalen, | |
2754 | length); | |
2755 | return MSG_NG; | |
2756 | } | |
2757 | if (MSG_OK != ospf_lsa_examin(lsah, lsalen, 0)) { | |
2758 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2759 | zlog_debug("%s: malformed LSA #%u", | |
2760 | __func__, counted_lsas); | |
2761 | return MSG_NG; | |
2762 | } | |
2763 | lsah = (struct lsa_header *)((caddr_t)lsah + lsalen); | |
2764 | length -= lsalen; | |
2765 | } | |
2766 | counted_lsas++; | |
2767 | } | |
2768 | ||
2769 | if (declared_num_lsas && counted_lsas != declared_num_lsas) { | |
2770 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2771 | zlog_debug( | |
2772 | "%s: #LSAs declared (%u) does not match actual (%u)", | |
2773 | __func__, declared_num_lsas, counted_lsas); | |
2774 | return MSG_NG; | |
2775 | } | |
2776 | return MSG_OK; | |
4e31de79 DO |
2777 | } |
2778 | ||
75c8eabb | 2779 | /* Verify a complete OSPF packet for proper sizing/alignment. */ |
d62a17ae | 2780 | static unsigned ospf_packet_examin(struct ospf_header *oh, |
2781 | const unsigned bytesonwire) | |
2782 | { | |
d7c0a89a | 2783 | uint16_t bytesdeclared, bytesauth; |
d62a17ae | 2784 | unsigned ret; |
2785 | struct ospf_ls_update *lsupd; | |
2786 | ||
2787 | /* Length, 1st approximation. */ | |
2788 | if (bytesonwire < OSPF_HEADER_SIZE) { | |
2789 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2790 | zlog_debug("%s: undersized (%u B) packet", __func__, | |
2791 | bytesonwire); | |
2792 | return MSG_NG; | |
2793 | } | |
2794 | /* Now it is safe to access header fields. Performing length check, | |
2795 | * allow | |
2796 | * for possible extra bytes of crypto auth/padding, which are not | |
2797 | * counted | |
2798 | * in the OSPF header "length" field. */ | |
2799 | if (oh->version != OSPF_VERSION) { | |
2800 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2801 | zlog_debug("%s: invalid (%u) protocol version", | |
2802 | __func__, oh->version); | |
2803 | return MSG_NG; | |
2804 | } | |
2805 | bytesdeclared = ntohs(oh->length); | |
2806 | if (ntohs(oh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2807 | bytesauth = 0; | |
2808 | else { | |
2809 | if (oh->u.crypt.auth_data_len != OSPF_AUTH_MD5_SIZE) { | |
2810 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2811 | zlog_debug( | |
2812 | "%s: unsupported crypto auth length (%u B)", | |
2813 | __func__, oh->u.crypt.auth_data_len); | |
2814 | return MSG_NG; | |
2815 | } | |
2816 | bytesauth = OSPF_AUTH_MD5_SIZE; | |
2817 | } | |
2818 | if (bytesdeclared + bytesauth > bytesonwire) { | |
2819 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2820 | zlog_debug( | |
2821 | "%s: packet length error (%u real, %u+%u declared)", | |
2822 | __func__, bytesonwire, bytesdeclared, | |
2823 | bytesauth); | |
2824 | return MSG_NG; | |
2825 | } | |
2826 | /* Length, 2nd approximation. The type-specific constraint is checked | |
2827 | against declared length, not amount of bytes on wire. */ | |
2828 | if (oh->type >= OSPF_MSG_HELLO && oh->type <= OSPF_MSG_LS_ACK | |
2829 | && bytesdeclared | |
2830 | < OSPF_HEADER_SIZE + ospf_packet_minlen[oh->type]) { | |
2831 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2832 | zlog_debug("%s: undersized (%u B) %s packet", __func__, | |
2833 | bytesdeclared, | |
2834 | lookup_msg(ospf_packet_type_str, oh->type, | |
2835 | NULL)); | |
2836 | return MSG_NG; | |
2837 | } | |
2838 | switch (oh->type) { | |
2839 | case OSPF_MSG_HELLO: | |
2840 | /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes | |
2841 | followed | |
2842 | by N>=0 router-IDs. */ | |
2843 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_HELLO_MIN_SIZE) | |
2844 | % 4 | |
2845 | ? MSG_NG | |
2846 | : MSG_OK; | |
2847 | break; | |
2848 | case OSPF_MSG_DB_DESC: | |
2849 | /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes | |
2850 | followed | |
2851 | by N>=0 header-only LSAs. */ | |
2852 | ret = ospf_lsaseq_examin( | |
2853 | (struct lsa_header *)((caddr_t)oh + OSPF_HEADER_SIZE | |
2854 | + OSPF_DB_DESC_MIN_SIZE), | |
2855 | bytesdeclared - OSPF_HEADER_SIZE | |
2856 | - OSPF_DB_DESC_MIN_SIZE, | |
2857 | 1, /* header-only LSAs */ | |
2858 | 0); | |
2859 | break; | |
2860 | case OSPF_MSG_LS_REQ: | |
2861 | /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes | |
2862 | * request blocks. */ | |
2863 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_REQ_MIN_SIZE) | |
2864 | % OSPF_LSA_KEY_SIZE | |
2865 | ? MSG_NG | |
2866 | : MSG_OK; | |
2867 | break; | |
2868 | case OSPF_MSG_LS_UPD: | |
2869 | /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes | |
2870 | followed | |
2871 | by N>=0 full LSAs (with N declared beforehand). */ | |
2872 | lsupd = (struct ospf_ls_update *)((caddr_t)oh | |
2873 | + OSPF_HEADER_SIZE); | |
2874 | ret = ospf_lsaseq_examin( | |
2875 | (struct lsa_header *)((caddr_t)lsupd | |
2876 | + OSPF_LS_UPD_MIN_SIZE), | |
2877 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_UPD_MIN_SIZE, | |
2878 | 0, /* full LSAs */ | |
2879 | ntohl(lsupd->num_lsas) /* 32 bits */ | |
9d303b37 | 2880 | ); |
d62a17ae | 2881 | break; |
2882 | case OSPF_MSG_LS_ACK: | |
2883 | /* RFC2328 A.3.6, packet header followed by N>=0 header-only | |
2884 | * LSAs. */ | |
2885 | ret = ospf_lsaseq_examin( | |
2886 | (struct lsa_header *)((caddr_t)oh + OSPF_HEADER_SIZE | |
2887 | + OSPF_LS_ACK_MIN_SIZE), | |
2888 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_ACK_MIN_SIZE, | |
2889 | 1, /* header-only LSAs */ | |
2890 | 0); | |
2891 | break; | |
2892 | default: | |
2893 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2894 | zlog_debug("%s: invalid packet type 0x%02x", __func__, | |
2895 | oh->type); | |
2896 | return MSG_NG; | |
2897 | } | |
2898 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2899 | zlog_debug("%s: malformed %s packet", __func__, | |
2900 | lookup_msg(ospf_packet_type_str, oh->type, NULL)); | |
2901 | return ret; | |
75c8eabb DO |
2902 | } |
2903 | ||
718e3744 | 2904 | /* OSPF Header verification. */ |
d62a17ae | 2905 | static int ospf_verify_header(struct stream *ibuf, struct ospf_interface *oi, |
2906 | struct ip *iph, struct ospf_header *ospfh) | |
2907 | { | |
2908 | /* Check Area ID. */ | |
2909 | if (!ospf_check_area_id(oi, ospfh)) { | |
cf444bcf | 2910 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 2911 | "interface %s: ospf_read invalid Area ID %s.", |
d62a17ae | 2912 | IF_NAME(oi), inet_ntoa(ospfh->area_id)); |
2913 | return -1; | |
2914 | } | |
718e3744 | 2915 | |
d62a17ae | 2916 | /* Check network mask, Silently discarded. */ |
2917 | if (!ospf_check_network_mask(oi, iph->ip_src)) { | |
c9cc11f6 | 2918 | flog_warn( |
cf444bcf | 2919 | EC_OSPF_PACKET, |
d62a17ae | 2920 | "interface %s: ospf_read network address is not same [%s]", |
2921 | IF_NAME(oi), inet_ntoa(iph->ip_src)); | |
2922 | return -1; | |
2923 | } | |
718e3744 | 2924 | |
d62a17ae | 2925 | /* Check authentication. The function handles logging actions, where |
2926 | * required. */ | |
2927 | if (!ospf_check_auth(oi, ospfh)) | |
2928 | return -1; | |
718e3744 | 2929 | |
d62a17ae | 2930 | return 0; |
718e3744 | 2931 | } |
2932 | ||
2933 | /* Starting point of packet process function. */ | |
d62a17ae | 2934 | int ospf_read(struct thread *thread) |
2935 | { | |
2936 | int ret; | |
2937 | struct stream *ibuf; | |
2938 | struct ospf *ospf; | |
2939 | struct ospf_interface *oi; | |
2940 | struct ip *iph; | |
2941 | struct ospf_header *ospfh; | |
d7c0a89a | 2942 | uint16_t length; |
b5a8894d | 2943 | struct interface *ifp = NULL; |
d62a17ae | 2944 | struct connected *c; |
2945 | ||
2946 | /* first of all get interface pointer. */ | |
2947 | ospf = THREAD_ARG(thread); | |
2948 | ||
2949 | /* prepare for next packet. */ | |
2950 | ospf->t_read = NULL; | |
2951 | thread_add_read(master, ospf_read, ospf, ospf->fd, &ospf->t_read); | |
2952 | ||
2953 | stream_reset(ospf->ibuf); | |
b5a8894d CS |
2954 | ibuf = ospf_recv_packet(ospf, ospf->fd, &ifp, ospf->ibuf); |
2955 | if (ibuf == NULL) | |
d62a17ae | 2956 | return -1; |
2957 | /* This raw packet is known to be at least as big as its IP header. */ | |
2958 | ||
2959 | /* Note that there should not be alignment problems with this assignment | |
2960 | because this is at the beginning of the stream data buffer. */ | |
2961 | iph = (struct ip *)STREAM_DATA(ibuf); | |
2962 | /* Note that sockopt_iphdrincl_swab_systoh was called in | |
2963 | * ospf_recv_packet. */ | |
2964 | ||
2965 | if (ifp == NULL) { | |
2966 | /* Handle cases where the platform does not support retrieving | |
2967 | the ifindex, | |
2968 | and also platforms (such as Solaris 8) that claim to support | |
2969 | ifindex | |
2970 | retrieval but do not. */ | |
2971 | c = if_lookup_address((void *)&iph->ip_src, AF_INET, | |
b5a8894d | 2972 | ospf->vrf_id); |
d62a17ae | 2973 | if (c) |
2974 | ifp = c->ifp; | |
2975 | if (ifp == NULL) | |
2976 | return 0; | |
2977 | } | |
2978 | ||
2979 | /* IP Header dump. */ | |
2980 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2981 | ospf_ip_header_dump(iph); | |
2982 | ||
2983 | /* Self-originated packet should be discarded silently. */ | |
2984 | if (ospf_if_lookup_by_local_addr(ospf, NULL, iph->ip_src)) { | |
2985 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) { | |
2986 | zlog_debug( | |
2987 | "ospf_read[%s]: Dropping self-originated packet", | |
2988 | inet_ntoa(iph->ip_src)); | |
2989 | } | |
2990 | return 0; | |
2991 | } | |
2992 | ||
2993 | /* Advance from IP header to OSPF header (iph->ip_hl has been verified | |
2994 | by ospf_recv_packet() to be correct). */ | |
2995 | stream_forward_getp(ibuf, iph->ip_hl * 4); | |
2996 | ||
2d34fb80 | 2997 | ospfh = (struct ospf_header *)stream_pnt(ibuf); |
d62a17ae | 2998 | if (MSG_OK |
9d303b37 DL |
2999 | != ospf_packet_examin( |
3000 | ospfh, stream_get_endp(ibuf) - stream_get_getp(ibuf))) | |
d62a17ae | 3001 | return -1; |
3002 | /* Now it is safe to access all fields of OSPF packet header. */ | |
3003 | ||
3004 | /* associate packet with ospf interface */ | |
3005 | oi = ospf_if_lookup_recv_if(ospf, iph->ip_src, ifp); | |
3006 | ||
3007 | /* ospf_verify_header() relies on a valid "oi" and thus can be called | |
3008 | only | |
3009 | after the passive/backbone/other checks below are passed. These | |
3010 | checks | |
3011 | in turn access the fields of unverified "ospfh" structure for their | |
3012 | own | |
3013 | purposes and must remain very accurate in doing this. */ | |
3014 | ||
3015 | /* If incoming interface is passive one, ignore it. */ | |
3016 | if (oi && OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) { | |
3017 | char buf[3][INET_ADDRSTRLEN]; | |
3018 | ||
3019 | if (IS_DEBUG_OSPF_EVENT) | |
3020 | zlog_debug( | |
3021 | "ignoring packet from router %s sent to %s, " | |
3022 | "received on a passive interface, %s", | |
3023 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], | |
3024 | sizeof(buf[0])), | |
3025 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], | |
3026 | sizeof(buf[1])), | |
3027 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
3028 | buf[2], sizeof(buf[2]))); | |
3029 | ||
3030 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) { | |
3031 | /* Try to fix multicast membership. | |
3032 | * Some OS:es may have problems in this area, | |
3033 | * make sure it is removed. | |
3034 | */ | |
3035 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
3036 | ospf_if_set_multicast(oi); | |
3037 | } | |
3038 | return 0; | |
3039 | } | |
3040 | ||
3041 | ||
3042 | /* if no local ospf_interface, | |
3043 | * or header area is backbone but ospf_interface is not | |
3044 | * check for VLINK interface | |
3045 | */ | |
9d303b37 DL |
3046 | if ((oi == NULL) || (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) |
3047 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id))) { | |
d62a17ae | 3048 | if ((oi = ospf_associate_packet_vl(ospf, ifp, iph, ospfh)) |
3049 | == NULL) { | |
3050 | if (!ospf->instance && IS_DEBUG_OSPF_EVENT) | |
3051 | zlog_debug( | |
3052 | "Packet from [%s] received on link %s" | |
3053 | " but no ospf_interface", | |
3054 | inet_ntoa(iph->ip_src), ifp->name); | |
3055 | return 0; | |
3056 | } | |
3057 | } | |
3058 | ||
3059 | /* else it must be a local ospf interface, check it was received on | |
3060 | * correct link | |
3061 | */ | |
3062 | else if (oi->ifp != ifp) { | |
3063 | if (IS_DEBUG_OSPF_EVENT) | |
cf444bcf | 3064 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 3065 | "Packet from [%s] received on wrong link %s", |
d62a17ae | 3066 | inet_ntoa(iph->ip_src), ifp->name); |
3067 | return 0; | |
3068 | } else if (oi->state == ISM_Down) { | |
3069 | char buf[2][INET_ADDRSTRLEN]; | |
c9cc11f6 | 3070 | flog_warn( |
cf444bcf | 3071 | EC_OSPF_PACKET, |
d62a17ae | 3072 | "Ignoring packet from %s to %s received on interface that is " |
3073 | "down [%s]; interface flags are %s", | |
3074 | inet_ntop(AF_INET, &iph->ip_src, buf[0], | |
3075 | sizeof(buf[0])), | |
3076 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], | |
3077 | sizeof(buf[1])), | |
3078 | ifp->name, if_flag_dump(ifp->flags)); | |
3079 | /* Fix multicast memberships? */ | |
3080 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
3081 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
3082 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) | |
3083 | OI_MEMBER_JOINED(oi, MEMBER_DROUTERS); | |
3084 | if (oi->multicast_memberships) | |
3085 | ospf_if_set_multicast(oi); | |
3086 | return 0; | |
3087 | } | |
3088 | ||
3089 | /* | |
3090 | * If the received packet is destined for AllDRouters, the packet | |
3091 | * should be accepted only if the received ospf interface state is | |
3092 | * either DR or Backup -- endo. | |
3093 | */ | |
3094 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS) | |
3095 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) { | |
c9cc11f6 | 3096 | flog_warn( |
cf444bcf | 3097 | EC_OSPF_PACKET, |
d62a17ae | 3098 | "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", |
3099 | inet_ntoa(iph->ip_src), IF_NAME(oi), | |
3100 | lookup_msg(ospf_ism_state_msg, oi->state, NULL)); | |
3101 | /* Try to fix multicast membership. */ | |
3102 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
3103 | ospf_if_set_multicast(oi); | |
3104 | return 0; | |
3105 | } | |
3106 | ||
3107 | /* Verify more OSPF header fields. */ | |
3108 | ret = ospf_verify_header(ibuf, oi, iph, ospfh); | |
3109 | if (ret < 0) { | |
3110 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
3111 | zlog_debug( | |
3112 | "ospf_read[%s]: Header check failed, " | |
3113 | "dropping.", | |
3114 | inet_ntoa(iph->ip_src)); | |
3115 | return ret; | |
3116 | } | |
3117 | ||
3118 | /* Show debug receiving packet. */ | |
3119 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) { | |
3120 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, DETAIL)) { | |
3121 | zlog_debug( | |
3122 | "-----------------------------------------------------"); | |
3123 | ospf_packet_dump(ibuf); | |
3124 | } | |
3125 | ||
3126 | zlog_debug("%s received from [%s] via [%s]", | |
3127 | lookup_msg(ospf_packet_type_str, ospfh->type, NULL), | |
3128 | inet_ntoa(ospfh->router_id), IF_NAME(oi)); | |
3129 | zlog_debug(" src [%s],", inet_ntoa(iph->ip_src)); | |
3130 | zlog_debug(" dst [%s]", inet_ntoa(iph->ip_dst)); | |
3131 | ||
3132 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, DETAIL)) | |
3133 | zlog_debug( | |
3134 | "-----------------------------------------------------"); | |
3135 | } | |
3136 | ||
3137 | stream_forward_getp(ibuf, OSPF_HEADER_SIZE); | |
3138 | ||
3139 | /* Adjust size to message length. */ | |
3140 | length = ntohs(ospfh->length) - OSPF_HEADER_SIZE; | |
3141 | ||
3142 | /* Read rest of the packet and call each sort of packet routine. */ | |
3143 | switch (ospfh->type) { | |
3144 | case OSPF_MSG_HELLO: | |
3145 | ospf_hello(iph, ospfh, ibuf, oi, length); | |
3146 | break; | |
3147 | case OSPF_MSG_DB_DESC: | |
3148 | ospf_db_desc(iph, ospfh, ibuf, oi, length); | |
3149 | break; | |
3150 | case OSPF_MSG_LS_REQ: | |
3151 | ospf_ls_req(iph, ospfh, ibuf, oi, length); | |
3152 | break; | |
3153 | case OSPF_MSG_LS_UPD: | |
3154 | ospf_ls_upd(ospf, iph, ospfh, ibuf, oi, length); | |
3155 | break; | |
3156 | case OSPF_MSG_LS_ACK: | |
3157 | ospf_ls_ack(iph, ospfh, ibuf, oi, length); | |
3158 | break; | |
3159 | default: | |
cf444bcf | 3160 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 3161 | "interface %s: OSPF packet header type %d is illegal", |
d62a17ae | 3162 | IF_NAME(oi), ospfh->type); |
3163 | break; | |
3164 | } | |
3165 | ||
b10ce841 | 3166 | return 0; |
718e3744 | 3167 | } |
3168 | ||
3169 | /* Make OSPF header. */ | |
d62a17ae | 3170 | static void ospf_make_header(int type, struct ospf_interface *oi, |
3171 | struct stream *s) | |
718e3744 | 3172 | { |
d62a17ae | 3173 | struct ospf_header *ospfh; |
718e3744 | 3174 | |
d62a17ae | 3175 | ospfh = (struct ospf_header *)STREAM_DATA(s); |
718e3744 | 3176 | |
d7c0a89a QY |
3177 | ospfh->version = (uint8_t)OSPF_VERSION; |
3178 | ospfh->type = (uint8_t)type; | |
718e3744 | 3179 | |
d62a17ae | 3180 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 3181 | |
d62a17ae | 3182 | ospfh->checksum = 0; |
3183 | ospfh->area_id = oi->area->area_id; | |
3184 | ospfh->auth_type = htons(ospf_auth_type(oi)); | |
718e3744 | 3185 | |
d62a17ae | 3186 | memset(ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); |
718e3744 | 3187 | |
d62a17ae | 3188 | stream_forward_endp(s, OSPF_HEADER_SIZE); |
718e3744 | 3189 | } |
3190 | ||
3191 | /* Make Authentication Data. */ | |
d62a17ae | 3192 | static int ospf_make_auth(struct ospf_interface *oi, struct ospf_header *ospfh) |
3193 | { | |
3194 | struct crypt_key *ck; | |
3195 | ||
3196 | switch (ospf_auth_type(oi)) { | |
3197 | case OSPF_AUTH_NULL: | |
3198 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); | |
3199 | */ | |
3200 | break; | |
3201 | case OSPF_AUTH_SIMPLE: | |
3202 | memcpy(ospfh->u.auth_data, OSPF_IF_PARAM(oi, auth_simple), | |
3203 | OSPF_AUTH_SIMPLE_SIZE); | |
3204 | break; | |
3205 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
3206 | /* If key is not set, then set 0. */ | |
3207 | if (list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) { | |
3208 | ospfh->u.crypt.zero = 0; | |
3209 | ospfh->u.crypt.key_id = 0; | |
3210 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3211 | } else { | |
3212 | ck = listgetdata( | |
3213 | listtail(OSPF_IF_PARAM(oi, auth_crypt))); | |
3214 | ospfh->u.crypt.zero = 0; | |
3215 | ospfh->u.crypt.key_id = ck->key_id; | |
3216 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3217 | } | |
3218 | /* note: the seq is done in ospf_make_md5_digest() */ | |
3219 | break; | |
3220 | default: | |
3221 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); | |
3222 | */ | |
3223 | break; | |
718e3744 | 3224 | } |
718e3744 | 3225 | |
d62a17ae | 3226 | return 0; |
718e3744 | 3227 | } |
3228 | ||
3229 | /* Fill rest of OSPF header. */ | |
d62a17ae | 3230 | static void ospf_fill_header(struct ospf_interface *oi, struct stream *s, |
d7c0a89a | 3231 | uint16_t length) |
d62a17ae | 3232 | { |
3233 | struct ospf_header *ospfh; | |
3234 | ||
3235 | ospfh = (struct ospf_header *)STREAM_DATA(s); | |
3236 | ||
3237 | /* Fill length. */ | |
3238 | ospfh->length = htons(length); | |
3239 | ||
3240 | /* Calculate checksum. */ | |
3241 | if (ntohs(ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
3242 | ospfh->checksum = in_cksum(ospfh, length); | |
3243 | else | |
3244 | ospfh->checksum = 0; | |
3245 | ||
3246 | /* Add Authentication Data. */ | |
3247 | ospf_make_auth(oi, ospfh); | |
3248 | } | |
3249 | ||
3250 | static int ospf_make_hello(struct ospf_interface *oi, struct stream *s) | |
3251 | { | |
3252 | struct ospf_neighbor *nbr; | |
3253 | struct route_node *rn; | |
d7c0a89a | 3254 | uint16_t length = OSPF_HELLO_MIN_SIZE; |
d62a17ae | 3255 | struct in_addr mask; |
3256 | unsigned long p; | |
3257 | int flag = 0; | |
3258 | ||
3259 | /* Set netmask of interface. */ | |
3260 | if (!(CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED) | |
3261 | && oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3262 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
3263 | masklen2ip(oi->address->prefixlen, &mask); | |
3264 | else | |
3265 | memset((char *)&mask, 0, sizeof(struct in_addr)); | |
3266 | stream_put_ipv4(s, mask.s_addr); | |
3267 | ||
3268 | /* Set Hello Interval. */ | |
3269 | if (OSPF_IF_PARAM(oi, fast_hello) == 0) | |
3270 | stream_putw(s, OSPF_IF_PARAM(oi, v_hello)); | |
3271 | else | |
3272 | stream_putw(s, 0); /* hello-interval of 0 for fast-hellos */ | |
3273 | ||
3274 | if (IS_DEBUG_OSPF_EVENT) | |
3275 | zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi), | |
3276 | IF_NAME(oi)); | |
3277 | ||
3278 | /* Set Options. */ | |
3279 | stream_putc(s, OPTIONS(oi)); | |
3280 | ||
3281 | /* Set Router Priority. */ | |
3282 | stream_putc(s, PRIORITY(oi)); | |
3283 | ||
3284 | /* Set Router Dead Interval. */ | |
3285 | stream_putl(s, OSPF_IF_PARAM(oi, v_wait)); | |
3286 | ||
3287 | /* Set Designated Router. */ | |
3288 | stream_put_ipv4(s, DR(oi).s_addr); | |
3289 | ||
3290 | p = stream_get_endp(s); | |
3291 | ||
3292 | /* Set Backup Designated Router. */ | |
3293 | stream_put_ipv4(s, BDR(oi).s_addr); | |
3294 | ||
3295 | /* Add neighbor seen. */ | |
3296 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3297 | if ((nbr = rn->info)) | |
3298 | if (nbr->router_id.s_addr | |
3299 | != 0) /* Ignore 0.0.0.0 node. */ | |
3300 | if (nbr->state | |
3301 | != NSM_Attempt) /* Ignore Down neighbor. */ | |
3302 | if (nbr->state | |
3303 | != NSM_Down) /* This is myself for | |
3304 | DR election. */ | |
3305 | if (!IPV4_ADDR_SAME( | |
3306 | &nbr->router_id, | |
3307 | &oi->ospf->router_id)) { | |
3308 | /* Check neighbor is | |
3309 | * sane? */ | |
3310 | if (nbr->d_router.s_addr | |
3311 | != 0 | |
3312 | && IPV4_ADDR_SAME( | |
3313 | &nbr->d_router, | |
3314 | &oi->address | |
3315 | ->u | |
3316 | .prefix4) | |
3317 | && IPV4_ADDR_SAME( | |
3318 | &nbr->bd_router, | |
3319 | &oi->address | |
3320 | ->u | |
3321 | .prefix4)) | |
3322 | flag = 1; | |
3323 | ||
9b18d58e NS |
3324 | /* Hello packet overflows interface MTU. */ |
3325 | if (length + sizeof(uint32_t) | |
3326 | > ospf_packet_max(oi)) { | |
3327 | flog_err( | |
3328 | EC_OSPF_LARGE_HELLO, | |
c531be7c | 3329 | "Oversized Hello packet! Larger than MTU. Not sending it out"); |
9b18d58e NS |
3330 | return 0; |
3331 | } | |
3332 | ||
d62a17ae | 3333 | stream_put_ipv4( |
3334 | s, | |
3335 | nbr->router_id | |
3336 | .s_addr); | |
3337 | length += 4; | |
3338 | } | |
3339 | ||
3340 | /* Let neighbor generate BackupSeen. */ | |
3341 | if (flag == 1) | |
3342 | stream_putl_at(s, p, 0); /* ipv4 address, normally */ | |
3343 | ||
3344 | return length; | |
3345 | } | |
3346 | ||
3347 | static int ospf_make_db_desc(struct ospf_interface *oi, | |
3348 | struct ospf_neighbor *nbr, struct stream *s) | |
3349 | { | |
3350 | struct ospf_lsa *lsa; | |
d7c0a89a QY |
3351 | uint16_t length = OSPF_DB_DESC_MIN_SIZE; |
3352 | uint8_t options; | |
d62a17ae | 3353 | unsigned long pp; |
3354 | int i; | |
3355 | struct ospf_lsdb *lsdb; | |
3356 | ||
3357 | /* Set Interface MTU. */ | |
3358 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3359 | stream_putw(s, 0); | |
3360 | else | |
3361 | stream_putw(s, oi->ifp->mtu); | |
3362 | ||
3363 | /* Set Options. */ | |
3364 | options = OPTIONS(oi); | |
3365 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) | |
3366 | SET_FLAG(options, OSPF_OPTION_O); | |
3367 | stream_putc(s, options); | |
3368 | ||
3369 | /* DD flags */ | |
3370 | pp = stream_get_endp(s); | |
3371 | stream_putc(s, nbr->dd_flags); | |
3372 | ||
3373 | /* Set DD Sequence Number. */ | |
3374 | stream_putl(s, nbr->dd_seqnum); | |
3375 | ||
3376 | /* shortcut unneeded walk of (empty) summary LSDBs */ | |
3377 | if (ospf_db_summary_isempty(nbr)) | |
3378 | goto empty; | |
3379 | ||
3380 | /* Describe LSA Header from Database Summary List. */ | |
3381 | lsdb = &nbr->db_sum; | |
3382 | ||
3383 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { | |
3384 | struct route_table *table = lsdb->type[i].db; | |
3385 | struct route_node *rn; | |
3386 | ||
3387 | for (rn = route_top(table); rn; rn = route_next(rn)) | |
3388 | if ((lsa = rn->info) != NULL) { | |
3389 | if (IS_OPAQUE_LSA(lsa->data->type) | |
3390 | && (!CHECK_FLAG(options, OSPF_OPTION_O))) { | |
3391 | /* Suppress advertising | |
0437e105 | 3392 | * opaque-information. */ |
d62a17ae | 3393 | /* Remove LSA from DB summary list. */ |
3394 | ospf_lsdb_delete(lsdb, lsa); | |
3395 | continue; | |
3396 | } | |
3397 | ||
3398 | if (!CHECK_FLAG(lsa->flags, OSPF_LSA_DISCARD)) { | |
3399 | struct lsa_header *lsah; | |
d7c0a89a | 3400 | uint16_t ls_age; |
d62a17ae | 3401 | |
3402 | /* DD packet overflows interface MTU. */ | |
3403 | if (length + OSPF_LSA_HEADER_SIZE | |
3404 | > ospf_packet_max(oi)) | |
3405 | break; | |
3406 | ||
3407 | /* Keep pointer to LS age. */ | |
3408 | lsah = (struct lsa_header | |
3409 | *)(STREAM_DATA(s) | |
3410 | + stream_get_endp( | |
3411 | s)); | |
3412 | ||
3413 | /* Proceed stream pointer. */ | |
3414 | stream_put(s, lsa->data, | |
3415 | OSPF_LSA_HEADER_SIZE); | |
3416 | length += OSPF_LSA_HEADER_SIZE; | |
3417 | ||
3418 | /* Set LS age. */ | |
3419 | ls_age = LS_AGE(lsa); | |
3420 | lsah->ls_age = htons(ls_age); | |
3421 | } | |
3422 | ||
3423 | /* Remove LSA from DB summary list. */ | |
3424 | ospf_lsdb_delete(lsdb, lsa); | |
3425 | } | |
3426 | } | |
718e3744 | 3427 | |
d62a17ae | 3428 | /* Update 'More' bit */ |
3429 | if (ospf_db_summary_isempty(nbr)) { | |
3430 | empty: | |
3431 | if (nbr->state >= NSM_Exchange) { | |
3432 | UNSET_FLAG(nbr->dd_flags, OSPF_DD_FLAG_M); | |
3433 | /* Rewrite DD flags */ | |
3434 | stream_putc_at(s, pp, nbr->dd_flags); | |
3435 | } else { | |
3436 | assert(IS_SET_DD_M(nbr->dd_flags)); | |
3437 | } | |
3438 | } | |
3439 | return length; | |
3440 | } | |
86f1fd96 | 3441 | |
d7c0a89a | 3442 | static int ospf_make_ls_req_func(struct stream *s, uint16_t *length, |
d62a17ae | 3443 | unsigned long delta, struct ospf_neighbor *nbr, |
3444 | struct ospf_lsa *lsa) | |
3445 | { | |
3446 | struct ospf_interface *oi; | |
718e3744 | 3447 | |
d62a17ae | 3448 | oi = nbr->oi; |
718e3744 | 3449 | |
9570f737 S |
3450 | /* LS Request packet overflows interface MTU |
3451 | * delta is just number of bytes required for 1 LS Req | |
3452 | * ospf_packet_max will return the number of bytes can | |
3453 | * be accomodated without ospf header. So length+delta | |
3454 | * can be compared to ospf_packet_max | |
3455 | * to check if it can fit another lsreq in the same packet. | |
3456 | */ | |
3457 | ||
d62a17ae | 3458 | if (*length + delta > ospf_packet_max(oi)) |
3459 | return 0; | |
1eb8ef25 | 3460 | |
d62a17ae | 3461 | stream_putl(s, lsa->data->type); |
3462 | stream_put_ipv4(s, lsa->data->id.s_addr); | |
3463 | stream_put_ipv4(s, lsa->data->adv_router.s_addr); | |
718e3744 | 3464 | |
d62a17ae | 3465 | ospf_lsa_unlock(&nbr->ls_req_last); |
3466 | nbr->ls_req_last = ospf_lsa_lock(lsa); | |
59ea14c6 | 3467 | |
d62a17ae | 3468 | *length += 12; |
3469 | return 1; | |
3470 | } | |
718e3744 | 3471 | |
d62a17ae | 3472 | static int ospf_make_ls_req(struct ospf_neighbor *nbr, struct stream *s) |
3473 | { | |
3474 | struct ospf_lsa *lsa; | |
d7c0a89a | 3475 | uint16_t length = OSPF_LS_REQ_MIN_SIZE; |
9570f737 | 3476 | unsigned long delta = 12; |
d62a17ae | 3477 | struct route_table *table; |
3478 | struct route_node *rn; | |
3479 | int i; | |
3480 | struct ospf_lsdb *lsdb; | |
718e3744 | 3481 | |
d62a17ae | 3482 | lsdb = &nbr->ls_req; |
718e3744 | 3483 | |
d62a17ae | 3484 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { |
3485 | table = lsdb->type[i].db; | |
3486 | for (rn = route_top(table); rn; rn = route_next(rn)) | |
3487 | if ((lsa = (rn->info)) != NULL) | |
3488 | if (ospf_make_ls_req_func(s, &length, delta, | |
3489 | nbr, lsa) | |
3490 | == 0) { | |
3491 | route_unlock_node(rn); | |
3492 | break; | |
3493 | } | |
3494 | } | |
3495 | return length; | |
3496 | } | |
718e3744 | 3497 | |
d62a17ae | 3498 | static int ls_age_increment(struct ospf_lsa *lsa, int delay) |
3499 | { | |
3500 | int age; | |
718e3744 | 3501 | |
d62a17ae | 3502 | age = IS_LSA_MAXAGE(lsa) ? OSPF_LSA_MAXAGE : LS_AGE(lsa) + delay; |
718e3744 | 3503 | |
d62a17ae | 3504 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); |
718e3744 | 3505 | } |
3506 | ||
d62a17ae | 3507 | static int ospf_make_ls_upd(struct ospf_interface *oi, struct list *update, |
3508 | struct stream *s) | |
718e3744 | 3509 | { |
d62a17ae | 3510 | struct ospf_lsa *lsa; |
3511 | struct listnode *node; | |
d7c0a89a | 3512 | uint16_t length = 0; |
d62a17ae | 3513 | unsigned int size_noauth; |
3514 | unsigned long delta = stream_get_endp(s); | |
3515 | unsigned long pp; | |
3516 | int count = 0; | |
3517 | ||
3518 | if (IS_DEBUG_OSPF_EVENT) | |
3519 | zlog_debug("ospf_make_ls_upd: Start"); | |
3520 | ||
3521 | pp = stream_get_endp(s); | |
3522 | stream_forward_endp(s, OSPF_LS_UPD_MIN_SIZE); | |
3523 | length += OSPF_LS_UPD_MIN_SIZE; | |
3524 | ||
3525 | /* Calculate amount of packet usable for data. */ | |
3526 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
3527 | ||
3528 | while ((node = listhead(update)) != NULL) { | |
3529 | struct lsa_header *lsah; | |
d7c0a89a | 3530 | uint16_t ls_age; |
d62a17ae | 3531 | |
3532 | if (IS_DEBUG_OSPF_EVENT) | |
3533 | zlog_debug("ospf_make_ls_upd: List Iteration %d", | |
3534 | count); | |
3535 | ||
3536 | lsa = listgetdata(node); | |
3537 | ||
3538 | assert(lsa->data); | |
3539 | ||
9570f737 S |
3540 | /* Will it fit? Minimum it has to fit atleast one */ |
3541 | if ((length + delta + ntohs(lsa->data->length) > size_noauth) && | |
3542 | (count > 0)) | |
d62a17ae | 3543 | break; |
3544 | ||
3545 | /* Keep pointer to LS age. */ | |
3546 | lsah = (struct lsa_header *)(STREAM_DATA(s) | |
3547 | + stream_get_endp(s)); | |
3548 | ||
3549 | /* Put LSA to Link State Request. */ | |
3550 | stream_put(s, lsa->data, ntohs(lsa->data->length)); | |
718e3744 | 3551 | |
d62a17ae | 3552 | /* Set LS age. */ |
3553 | /* each hop must increment an lsa_age by transmit_delay | |
3554 | of OSPF interface */ | |
3555 | ls_age = ls_age_increment(lsa, | |
3556 | OSPF_IF_PARAM(oi, transmit_delay)); | |
3557 | lsah->ls_age = htons(ls_age); | |
3558 | ||
3559 | length += ntohs(lsa->data->length); | |
3560 | count++; | |
3561 | ||
3562 | list_delete_node(update, node); | |
3563 | ospf_lsa_unlock(&lsa); /* oi->ls_upd_queue */ | |
3564 | } | |
3565 | ||
3566 | /* Now set #LSAs. */ | |
3567 | stream_putl_at(s, pp, count); | |
3568 | ||
3569 | if (IS_DEBUG_OSPF_EVENT) | |
3570 | zlog_debug("ospf_make_ls_upd: Stop"); | |
3571 | return length; | |
718e3744 | 3572 | } |
3573 | ||
d62a17ae | 3574 | static int ospf_make_ls_ack(struct ospf_interface *oi, struct list *ack, |
3575 | struct stream *s) | |
718e3744 | 3576 | { |
d62a17ae | 3577 | struct listnode *node, *nnode; |
d7c0a89a | 3578 | uint16_t length = OSPF_LS_ACK_MIN_SIZE; |
9570f737 | 3579 | unsigned long delta = OSPF_LSA_HEADER_SIZE; |
d62a17ae | 3580 | struct ospf_lsa *lsa; |
718e3744 | 3581 | |
d62a17ae | 3582 | for (ALL_LIST_ELEMENTS(ack, node, nnode, lsa)) { |
3583 | assert(lsa); | |
718e3744 | 3584 | |
9570f737 S |
3585 | /* LS Ack packet overflows interface MTU |
3586 | * delta is just number of bytes required for | |
3587 | * 1 LS Ack(1 LS Hdr) ospf_packet_max will return | |
3588 | * the number of bytes can be accomodated without | |
3589 | * ospf header. So length+delta can be compared | |
3590 | * against ospf_packet_max to check if it can fit | |
3591 | * another ls header in the same packet. | |
3592 | */ | |
3593 | if ((length + delta) > ospf_packet_max(oi)) | |
d62a17ae | 3594 | break; |
718e3744 | 3595 | |
d62a17ae | 3596 | stream_put(s, lsa->data, OSPF_LSA_HEADER_SIZE); |
3597 | length += OSPF_LSA_HEADER_SIZE; | |
3598 | ||
3599 | listnode_delete(ack, lsa); | |
3600 | ospf_lsa_unlock(&lsa); /* oi->ls_ack_direct.ls_ack */ | |
3601 | } | |
3602 | ||
3603 | return length; | |
3604 | } | |
3605 | ||
3606 | static void ospf_hello_send_sub(struct ospf_interface *oi, in_addr_t addr) | |
3607 | { | |
3608 | struct ospf_packet *op; | |
d7c0a89a | 3609 | uint16_t length = OSPF_HEADER_SIZE; |
718e3744 | 3610 | |
d62a17ae | 3611 | op = ospf_packet_new(oi->ifp->mtu); |
718e3744 | 3612 | |
d62a17ae | 3613 | /* Prepare OSPF common header. */ |
3614 | ospf_make_header(OSPF_MSG_HELLO, oi, op->s); | |
718e3744 | 3615 | |
d62a17ae | 3616 | /* Prepare OSPF Hello body. */ |
3617 | length += ospf_make_hello(oi, op->s); | |
9b18d58e NS |
3618 | if (length == OSPF_HEADER_SIZE) { |
3619 | /* Hello overshooting MTU */ | |
3620 | ospf_packet_free(op); | |
3621 | return; | |
3622 | } | |
718e3744 | 3623 | |
d62a17ae | 3624 | /* Fill OSPF header. */ |
3625 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3626 | |
d62a17ae | 3627 | /* Set packet length. */ |
3628 | op->length = length; | |
3629 | ||
3630 | op->dst.s_addr = addr; | |
3631 | ||
b5a8894d CS |
3632 | if (IS_DEBUG_OSPF_EVENT) { |
3633 | if (oi->ospf->vrf_id) | |
996c9314 LB |
3634 | zlog_debug( |
3635 | "%s: Hello Tx interface %s ospf vrf %s id %u", | |
3636 | __PRETTY_FUNCTION__, oi->ifp->name, | |
3637 | ospf_vrf_id_to_name(oi->ospf->vrf_id), | |
3638 | oi->ospf->vrf_id); | |
b5a8894d | 3639 | } |
d62a17ae | 3640 | /* Add packet to the top of the interface output queue, so that they |
3641 | * can't get delayed by things like long queues of LS Update packets | |
3642 | */ | |
3643 | ospf_packet_add_top(oi, op); | |
3644 | ||
3645 | /* Hook thread to write packet. */ | |
3646 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3647 | } |
3648 | ||
d62a17ae | 3649 | static void ospf_poll_send(struct ospf_nbr_nbma *nbr_nbma) |
718e3744 | 3650 | { |
d62a17ae | 3651 | struct ospf_interface *oi; |
718e3744 | 3652 | |
d62a17ae | 3653 | oi = nbr_nbma->oi; |
3654 | assert(oi); | |
718e3744 | 3655 | |
d62a17ae | 3656 | /* If this is passive interface, do not send OSPF Hello. */ |
3657 | if (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) | |
3658 | return; | |
718e3744 | 3659 | |
d62a17ae | 3660 | if (oi->type != OSPF_IFTYPE_NBMA) |
3661 | return; | |
718e3744 | 3662 | |
d62a17ae | 3663 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) |
3664 | return; | |
718e3744 | 3665 | |
d62a17ae | 3666 | if (PRIORITY(oi) == 0) |
3667 | return; | |
718e3744 | 3668 | |
d62a17ae | 3669 | if (nbr_nbma->priority == 0 && oi->state != ISM_DR |
3670 | && oi->state != ISM_Backup) | |
3671 | return; | |
718e3744 | 3672 | |
d62a17ae | 3673 | ospf_hello_send_sub(oi, nbr_nbma->addr.s_addr); |
718e3744 | 3674 | } |
3675 | ||
d62a17ae | 3676 | int ospf_poll_timer(struct thread *thread) |
718e3744 | 3677 | { |
d62a17ae | 3678 | struct ospf_nbr_nbma *nbr_nbma; |
718e3744 | 3679 | |
d62a17ae | 3680 | nbr_nbma = THREAD_ARG(thread); |
3681 | nbr_nbma->t_poll = NULL; | |
718e3744 | 3682 | |
d62a17ae | 3683 | if (IS_DEBUG_OSPF(nsm, NSM_TIMERS)) |
3684 | zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)", | |
3685 | IF_NAME(nbr_nbma->oi), inet_ntoa(nbr_nbma->addr)); | |
718e3744 | 3686 | |
d62a17ae | 3687 | ospf_poll_send(nbr_nbma); |
718e3744 | 3688 | |
d62a17ae | 3689 | if (nbr_nbma->v_poll > 0) |
3690 | OSPF_POLL_TIMER_ON(nbr_nbma->t_poll, ospf_poll_timer, | |
3691 | nbr_nbma->v_poll); | |
718e3744 | 3692 | |
d62a17ae | 3693 | return 0; |
718e3744 | 3694 | } |
3695 | ||
3696 | ||
d62a17ae | 3697 | int ospf_hello_reply_timer(struct thread *thread) |
718e3744 | 3698 | { |
d62a17ae | 3699 | struct ospf_neighbor *nbr; |
718e3744 | 3700 | |
d62a17ae | 3701 | nbr = THREAD_ARG(thread); |
3702 | nbr->t_hello_reply = NULL; | |
718e3744 | 3703 | |
d62a17ae | 3704 | assert(nbr->oi); |
718e3744 | 3705 | |
d62a17ae | 3706 | if (IS_DEBUG_OSPF(nsm, NSM_TIMERS)) |
3707 | zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)", | |
3708 | IF_NAME(nbr->oi), inet_ntoa(nbr->router_id)); | |
718e3744 | 3709 | |
d62a17ae | 3710 | ospf_hello_send_sub(nbr->oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3711 | |
d62a17ae | 3712 | return 0; |
718e3744 | 3713 | } |
3714 | ||
3715 | /* Send OSPF Hello. */ | |
d62a17ae | 3716 | void ospf_hello_send(struct ospf_interface *oi) |
3717 | { | |
3718 | /* If this is passive interface, do not send OSPF Hello. */ | |
3719 | if (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) | |
3720 | return; | |
3721 | ||
3722 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
3723 | struct ospf_neighbor *nbr; | |
3724 | struct route_node *rn; | |
3725 | ||
3726 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3727 | if ((nbr = rn->info)) | |
3728 | if (nbr != oi->nbr_self) | |
3729 | if (nbr->state != NSM_Down) { | |
3730 | /* RFC 2328 Section 9.5.1 | |
3731 | If the router is not | |
3732 | eligible to become Designated | |
3733 | Router, | |
3734 | it must periodically send | |
3735 | Hello Packets to both the | |
3736 | Designated Router and the | |
3737 | Backup Designated Router (if | |
3738 | they | |
3739 | exist). */ | |
3740 | if (PRIORITY(oi) == 0 | |
3741 | && IPV4_ADDR_CMP( | |
3742 | &DR(oi), | |
3743 | &nbr->address.u | |
3744 | .prefix4) | |
3745 | && IPV4_ADDR_CMP( | |
3746 | &BDR(oi), | |
3747 | &nbr->address.u | |
3748 | .prefix4)) | |
3749 | continue; | |
3750 | ||
3751 | /* If the router is eligible to | |
3752 | become Designated Router, it | |
3753 | must periodically send Hello | |
3754 | Packets to all neighbors that | |
3755 | are also eligible. In | |
3756 | addition, if the router is | |
3757 | itself the | |
3758 | Designated Router or Backup | |
3759 | Designated Router, it must | |
3760 | also | |
3761 | send periodic Hello Packets | |
3762 | to all other neighbors. */ | |
3763 | ||
3764 | if (nbr->priority == 0 | |
3765 | && oi->state == ISM_DROther) | |
3766 | continue; | |
3767 | /* if oi->state == Waiting, send | |
3768 | * hello to all neighbors */ | |
3769 | ospf_hello_send_sub( | |
3770 | oi, | |
3771 | nbr->address.u.prefix4 | |
3772 | .s_addr); | |
3773 | } | |
3774 | } else { | |
3775 | /* Decide destination address. */ | |
3776 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3777 | ospf_hello_send_sub(oi, oi->vl_data->peer_addr.s_addr); | |
3778 | else | |
3779 | ospf_hello_send_sub(oi, htonl(OSPF_ALLSPFROUTERS)); | |
3780 | } | |
718e3744 | 3781 | } |
3782 | ||
3783 | /* Send OSPF Database Description. */ | |
d62a17ae | 3784 | void ospf_db_desc_send(struct ospf_neighbor *nbr) |
718e3744 | 3785 | { |
d62a17ae | 3786 | struct ospf_interface *oi; |
3787 | struct ospf_packet *op; | |
d7c0a89a | 3788 | uint16_t length = OSPF_HEADER_SIZE; |
718e3744 | 3789 | |
d62a17ae | 3790 | oi = nbr->oi; |
3791 | op = ospf_packet_new(oi->ifp->mtu); | |
718e3744 | 3792 | |
d62a17ae | 3793 | /* Prepare OSPF common header. */ |
3794 | ospf_make_header(OSPF_MSG_DB_DESC, oi, op->s); | |
718e3744 | 3795 | |
d62a17ae | 3796 | /* Prepare OSPF Database Description body. */ |
3797 | length += ospf_make_db_desc(oi, nbr, op->s); | |
718e3744 | 3798 | |
d62a17ae | 3799 | /* Fill OSPF header. */ |
3800 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3801 | |
d62a17ae | 3802 | /* Set packet length. */ |
3803 | op->length = length; | |
718e3744 | 3804 | |
d62a17ae | 3805 | /* Decide destination address. */ |
3806 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3807 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3808 | else | |
3809 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3810 | |
d62a17ae | 3811 | /* Add packet to the interface output queue. */ |
3812 | ospf_packet_add(oi, op); | |
718e3744 | 3813 | |
d62a17ae | 3814 | /* Hook thread to write packet. */ |
3815 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3816 | |
d62a17ae | 3817 | /* Remove old DD packet, then copy new one and keep in neighbor |
3818 | * structure. */ | |
3819 | if (nbr->last_send) | |
3820 | ospf_packet_free(nbr->last_send); | |
3821 | nbr->last_send = ospf_packet_dup(op); | |
3822 | monotime(&nbr->last_send_ts); | |
718e3744 | 3823 | } |
3824 | ||
3825 | /* Re-send Database Description. */ | |
d62a17ae | 3826 | void ospf_db_desc_resend(struct ospf_neighbor *nbr) |
718e3744 | 3827 | { |
d62a17ae | 3828 | struct ospf_interface *oi; |
718e3744 | 3829 | |
d62a17ae | 3830 | oi = nbr->oi; |
718e3744 | 3831 | |
d62a17ae | 3832 | /* Add packet to the interface output queue. */ |
3833 | ospf_packet_add(oi, ospf_packet_dup(nbr->last_send)); | |
718e3744 | 3834 | |
d62a17ae | 3835 | /* Hook thread to write packet. */ |
3836 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3837 | } |
3838 | ||
3839 | /* Send Link State Request. */ | |
d62a17ae | 3840 | void ospf_ls_req_send(struct ospf_neighbor *nbr) |
718e3744 | 3841 | { |
d62a17ae | 3842 | struct ospf_interface *oi; |
3843 | struct ospf_packet *op; | |
d7c0a89a | 3844 | uint16_t length = OSPF_HEADER_SIZE; |
718e3744 | 3845 | |
d62a17ae | 3846 | oi = nbr->oi; |
3847 | op = ospf_packet_new(oi->ifp->mtu); | |
718e3744 | 3848 | |
d62a17ae | 3849 | /* Prepare OSPF common header. */ |
3850 | ospf_make_header(OSPF_MSG_LS_REQ, oi, op->s); | |
718e3744 | 3851 | |
d62a17ae | 3852 | /* Prepare OSPF Link State Request body. */ |
3853 | length += ospf_make_ls_req(nbr, op->s); | |
3854 | if (length == OSPF_HEADER_SIZE) { | |
3855 | ospf_packet_free(op); | |
3856 | return; | |
3857 | } | |
718e3744 | 3858 | |
d62a17ae | 3859 | /* Fill OSPF header. */ |
3860 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3861 | |
d62a17ae | 3862 | /* Set packet length. */ |
3863 | op->length = length; | |
718e3744 | 3864 | |
d62a17ae | 3865 | /* Decide destination address. */ |
3866 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3867 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3868 | else | |
3869 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3870 | |
d62a17ae | 3871 | /* Add packet to the interface output queue. */ |
3872 | ospf_packet_add(oi, op); | |
718e3744 | 3873 | |
d62a17ae | 3874 | /* Hook thread to write packet. */ |
3875 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3876 | |
d62a17ae | 3877 | /* Add Link State Request Retransmission Timer. */ |
3878 | OSPF_NSM_TIMER_ON(nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
718e3744 | 3879 | } |
3880 | ||
3881 | /* Send Link State Update with an LSA. */ | |
d62a17ae | 3882 | void ospf_ls_upd_send_lsa(struct ospf_neighbor *nbr, struct ospf_lsa *lsa, |
3883 | int flag) | |
718e3744 | 3884 | { |
d62a17ae | 3885 | struct list *update; |
718e3744 | 3886 | |
d62a17ae | 3887 | update = list_new(); |
718e3744 | 3888 | |
d62a17ae | 3889 | listnode_add(update, lsa); |
046460a1 CS |
3890 | |
3891 | /*ospf instance is going down, send self originated | |
3892 | * MAXAGE LSA update to neighbors to remove from LSDB */ | |
3893 | if (nbr->oi->ospf->inst_shutdown && IS_LSA_MAXAGE(lsa)) | |
3894 | ospf_ls_upd_send(nbr, update, flag, 1); | |
3895 | else | |
3896 | ospf_ls_upd_send(nbr, update, flag, 0); | |
718e3744 | 3897 | |
6a154c88 | 3898 | list_delete(&update); |
718e3744 | 3899 | } |
3900 | ||
68b7339a | 3901 | /* Determine size for packet. Must be at least big enough to accomodate next |
3902 | * LSA on list, which may be bigger than MTU size. | |
3903 | * | |
3904 | * Return pointer to new ospf_packet | |
3905 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3906 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3907 | */ | |
d62a17ae | 3908 | static struct ospf_packet *ospf_ls_upd_packet_new(struct list *update, |
3909 | struct ospf_interface *oi) | |
3910 | { | |
3911 | struct ospf_lsa *lsa; | |
3912 | struct listnode *ln; | |
3913 | size_t size; | |
3914 | static char warned = 0; | |
3915 | ||
3916 | lsa = listgetdata((ln = listhead(update))); | |
3917 | assert(lsa->data); | |
3918 | ||
3919 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs(lsa->data->length)) | |
3920 | > ospf_packet_max(oi)) { | |
3921 | if (!warned) { | |
c9cc11f6 | 3922 | flog_warn( |
cf444bcf | 3923 | EC_OSPF_LARGE_LSA, |
d62a17ae | 3924 | "ospf_ls_upd_packet_new: oversized LSA encountered!" |
3925 | "will need to fragment. Not optimal. Try divide up" | |
3926 | " your network with areas. Use 'debug ospf packet send'" | |
3927 | " to see details, or look at 'show ip ospf database ..'"); | |
3928 | warned = 1; | |
3929 | } | |
3930 | ||
3931 | if (IS_DEBUG_OSPF_PACKET(0, SEND)) | |
3932 | zlog_debug( | |
3933 | "ospf_ls_upd_packet_new: oversized LSA id:%s," | |
3934 | " %d bytes originated by %s, will be fragmented!", | |
3935 | inet_ntoa(lsa->data->id), | |
3936 | ntohs(lsa->data->length), | |
3937 | inet_ntoa(lsa->data->adv_router)); | |
3938 | ||
3939 | /* | |
3940 | * Allocate just enough to fit this LSA only, to avoid including | |
3941 | * other | |
3942 | * LSAs in fragmented LSA Updates. | |
3943 | */ | |
3944 | size = ntohs(lsa->data->length) | |
3945 | + (oi->ifp->mtu - ospf_packet_max(oi)) | |
3946 | + OSPF_LS_UPD_MIN_SIZE; | |
3947 | } else | |
3948 | size = oi->ifp->mtu; | |
3949 | ||
3950 | if (size > OSPF_MAX_PACKET_SIZE) { | |
cf444bcf | 3951 | flog_warn(EC_OSPF_LARGE_LSA, |
c9cc11f6 DS |
3952 | "ospf_ls_upd_packet_new: oversized LSA id:%s too big," |
3953 | " %d bytes, packet size %ld, dropping it completely." | |
3954 | " OSPF routing is broken!", | |
3955 | inet_ntoa(lsa->data->id), ntohs(lsa->data->length), | |
3956 | (long int)size); | |
d62a17ae | 3957 | list_delete_node(update, ln); |
3958 | return NULL; | |
3959 | } | |
718e3744 | 3960 | |
d62a17ae | 3961 | /* IP header is built up separately by ospf_write(). This means, that we |
3962 | * must | |
3963 | * reduce the "affordable" size just calculated by length of an IP | |
3964 | * header. | |
3965 | * This makes sure, that even if we manage to fill the payload with LSA | |
3966 | * data | |
3967 | * completely, the final packet (our data plus IP header) still fits | |
3968 | * into | |
3969 | * outgoing interface MTU. This correction isn't really meaningful for | |
3970 | * an | |
3971 | * oversized LSA, but for consistency the correction is done for both | |
3972 | * cases. | |
3973 | * | |
3974 | * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size | |
3975 | */ | |
3976 | return ospf_packet_new(size - sizeof(struct ip)); | |
718e3744 | 3977 | } |
3978 | ||
d62a17ae | 3979 | static void ospf_ls_upd_queue_send(struct ospf_interface *oi, |
046460a1 CS |
3980 | struct list *update, struct in_addr addr, |
3981 | int send_lsupd_now) | |
718e3744 | 3982 | { |
d62a17ae | 3983 | struct ospf_packet *op; |
d7c0a89a | 3984 | uint16_t length = OSPF_HEADER_SIZE; |
d62a17ae | 3985 | |
3986 | if (IS_DEBUG_OSPF_EVENT) | |
3987 | zlog_debug("listcount = %d, [%s]dst %s", listcount(update), | |
3988 | IF_NAME(oi), inet_ntoa(addr)); | |
3989 | ||
19274fe8 OD |
3990 | /* Check that we have really something to process */ |
3991 | if (listcount(update) == 0) | |
3992 | return; | |
3993 | ||
d62a17ae | 3994 | op = ospf_ls_upd_packet_new(update, oi); |
718e3744 | 3995 | |
d62a17ae | 3996 | /* Prepare OSPF common header. */ |
3997 | ospf_make_header(OSPF_MSG_LS_UPD, oi, op->s); | |
718e3744 | 3998 | |
d62a17ae | 3999 | /* Prepare OSPF Link State Update body. |
4000 | * Includes Type-7 translation. | |
4001 | */ | |
4002 | length += ospf_make_ls_upd(oi, update, op->s); | |
4003 | ||
4004 | /* Fill OSPF header. */ | |
4005 | ospf_fill_header(oi, op->s, length); | |
4006 | ||
4007 | /* Set packet length. */ | |
4008 | op->length = length; | |
4009 | ||
4010 | /* Decide destination address. */ | |
4011 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4012 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4013 | else | |
4014 | op->dst.s_addr = addr.s_addr; | |
4015 | ||
4016 | /* Add packet to the interface output queue. */ | |
4017 | ospf_packet_add(oi, op); | |
046460a1 CS |
4018 | /* Call ospf_write() right away to send ospf packets to neighbors */ |
4019 | if (send_lsupd_now) { | |
4020 | struct thread os_packet_thd; | |
4021 | ||
4022 | os_packet_thd.arg = (void *)oi->ospf; | |
4023 | if (oi->on_write_q == 0) { | |
4024 | listnode_add(oi->ospf->oi_write_q, oi); | |
4025 | oi->on_write_q = 1; | |
4026 | } | |
4027 | ospf_write(&os_packet_thd); | |
4028 | } else { | |
4029 | /* Hook thread to write packet. */ | |
4030 | OSPF_ISM_WRITE_ON(oi->ospf); | |
4031 | } | |
d62a17ae | 4032 | } |
4033 | ||
4034 | static int ospf_ls_upd_send_queue_event(struct thread *thread) | |
4035 | { | |
4036 | struct ospf_interface *oi = THREAD_ARG(thread); | |
4037 | struct route_node *rn; | |
4038 | struct route_node *rnext; | |
4039 | struct list *update; | |
4040 | char again = 0; | |
4041 | ||
4042 | oi->t_ls_upd_event = NULL; | |
4043 | ||
4044 | if (IS_DEBUG_OSPF_EVENT) | |
4045 | zlog_debug("ospf_ls_upd_send_queue start"); | |
4046 | ||
4047 | for (rn = route_top(oi->ls_upd_queue); rn; rn = rnext) { | |
4048 | rnext = route_next(rn); | |
4049 | ||
4050 | if (rn->info == NULL) | |
4051 | continue; | |
4052 | ||
4053 | update = (struct list *)rn->info; | |
4054 | ||
046460a1 | 4055 | ospf_ls_upd_queue_send(oi, update, rn->p.u.prefix4, 0); |
d62a17ae | 4056 | |
4057 | /* list might not be empty. */ | |
4058 | if (listcount(update) == 0) { | |
6a154c88 | 4059 | list_delete((struct list **)&rn->info); |
d62a17ae | 4060 | route_unlock_node(rn); |
4061 | } else | |
4062 | again = 1; | |
4063 | } | |
4064 | ||
4065 | if (again != 0) { | |
4066 | if (IS_DEBUG_OSPF_EVENT) | |
4067 | zlog_debug( | |
4068 | "ospf_ls_upd_send_queue: update lists not cleared," | |
4069 | " %d nodes to try again, raising new event", | |
4070 | again); | |
4071 | oi->t_ls_upd_event = NULL; | |
4072 | thread_add_event(master, ospf_ls_upd_send_queue_event, oi, 0, | |
4073 | &oi->t_ls_upd_event); | |
4074 | } | |
4075 | ||
4076 | if (IS_DEBUG_OSPF_EVENT) | |
4077 | zlog_debug("ospf_ls_upd_send_queue stop"); | |
4078 | ||
4079 | return 0; | |
4080 | } | |
4081 | ||
046460a1 CS |
4082 | void ospf_ls_upd_send(struct ospf_neighbor *nbr, struct list *update, int flag, |
4083 | int send_lsupd_now) | |
d62a17ae | 4084 | { |
4085 | struct ospf_interface *oi; | |
4086 | struct ospf_lsa *lsa; | |
4087 | struct prefix_ipv4 p; | |
4088 | struct route_node *rn; | |
4089 | struct listnode *node; | |
4090 | ||
4091 | oi = nbr->oi; | |
4092 | ||
4093 | p.family = AF_INET; | |
4094 | p.prefixlen = IPV4_MAX_BITLEN; | |
4095 | ||
4096 | /* Decide destination address. */ | |
4097 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
4098 | p.prefix = oi->vl_data->peer_addr; | |
4099 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4100 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4101 | else if (flag == OSPF_SEND_PACKET_DIRECT) | |
4102 | p.prefix = nbr->address.u.prefix4; | |
4103 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
4104 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4105 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) | |
4106 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4107 | else | |
4108 | p.prefix.s_addr = htonl(OSPF_ALLDROUTERS); | |
4109 | ||
4110 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
4111 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
c9cc11f6 | 4112 | flog_warn( |
cf444bcf | 4113 | EC_OSPF_PACKET, |
d62a17ae | 4114 | "* LS-Update is directly sent on NBMA network."); |
19aad877 | 4115 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix)) |
cf444bcf | 4116 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 4117 | "* LS-Update is sent to myself."); |
d62a17ae | 4118 | } |
4119 | ||
4120 | rn = route_node_get(oi->ls_upd_queue, (struct prefix *)&p); | |
4121 | ||
4122 | if (rn->info == NULL) | |
4123 | rn->info = list_new(); | |
4124 | else | |
4125 | route_unlock_node(rn); | |
4126 | ||
4127 | for (ALL_LIST_ELEMENTS_RO(update, node, lsa)) | |
4128 | listnode_add(rn->info, | |
4129 | ospf_lsa_lock(lsa)); /* oi->ls_upd_queue */ | |
046460a1 CS |
4130 | if (send_lsupd_now) { |
4131 | struct list *send_update_list; | |
f7813c7c | 4132 | struct route_node *rnext; |
d62a17ae | 4133 | |
046460a1 CS |
4134 | for (rn = route_top(oi->ls_upd_queue); rn; rn = rnext) { |
4135 | rnext = route_next(rn); | |
4136 | ||
4137 | if (rn->info == NULL) | |
4138 | continue; | |
4139 | ||
4140 | send_update_list = (struct list *)rn->info; | |
4141 | ||
4142 | ospf_ls_upd_queue_send(oi, send_update_list, | |
4143 | rn->p.u.prefix4, 1); | |
046460a1 CS |
4144 | } |
4145 | } else | |
4146 | thread_add_event(master, ospf_ls_upd_send_queue_event, oi, 0, | |
996c9314 | 4147 | &oi->t_ls_upd_event); |
718e3744 | 4148 | } |
4149 | ||
d62a17ae | 4150 | static void ospf_ls_ack_send_list(struct ospf_interface *oi, struct list *ack, |
4151 | struct in_addr dst) | |
718e3744 | 4152 | { |
d62a17ae | 4153 | struct ospf_packet *op; |
d7c0a89a | 4154 | uint16_t length = OSPF_HEADER_SIZE; |
d62a17ae | 4155 | |
4156 | op = ospf_packet_new(oi->ifp->mtu); | |
4157 | ||
4158 | /* Prepare OSPF common header. */ | |
4159 | ospf_make_header(OSPF_MSG_LS_ACK, oi, op->s); | |
4160 | ||
4161 | /* Prepare OSPF Link State Acknowledgment body. */ | |
4162 | length += ospf_make_ls_ack(oi, ack, op->s); | |
4163 | ||
4164 | /* Fill OSPF header. */ | |
4165 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 4166 | |
d62a17ae | 4167 | /* Set packet length. */ |
4168 | op->length = length; | |
4169 | ||
4170 | /* Decide destination address. */ | |
4171 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4172 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4173 | else | |
4174 | op->dst.s_addr = dst.s_addr; | |
4175 | ||
4176 | /* Add packet to the interface output queue. */ | |
4177 | ospf_packet_add(oi, op); | |
4178 | ||
4179 | /* Hook thread to write packet. */ | |
4180 | OSPF_ISM_WRITE_ON(oi->ospf); | |
4181 | } | |
4182 | ||
4183 | static int ospf_ls_ack_send_event(struct thread *thread) | |
4184 | { | |
4185 | struct ospf_interface *oi = THREAD_ARG(thread); | |
4186 | ||
4187 | oi->t_ls_ack_direct = NULL; | |
4188 | ||
4189 | while (listcount(oi->ls_ack_direct.ls_ack)) | |
4190 | ospf_ls_ack_send_list(oi, oi->ls_ack_direct.ls_ack, | |
4191 | oi->ls_ack_direct.dst); | |
4192 | ||
4193 | return 0; | |
4194 | } | |
4195 | ||
4196 | void ospf_ls_ack_send(struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
4197 | { | |
4198 | struct ospf_interface *oi = nbr->oi; | |
4199 | ||
4200 | if (listcount(oi->ls_ack_direct.ls_ack) == 0) | |
4201 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
4202 | ||
4203 | listnode_add(oi->ls_ack_direct.ls_ack, ospf_lsa_lock(lsa)); | |
4204 | ||
4205 | thread_add_event(master, ospf_ls_ack_send_event, oi, 0, | |
4206 | &oi->t_ls_ack_direct); | |
718e3744 | 4207 | } |
4208 | ||
4209 | /* Send Link State Acknowledgment delayed. */ | |
d62a17ae | 4210 | void ospf_ls_ack_send_delayed(struct ospf_interface *oi) |
4211 | { | |
4212 | struct in_addr dst; | |
4213 | ||
4214 | /* Decide destination address. */ | |
4215 | /* RFC2328 Section 13.5 On non-broadcast | |
4216 | networks, delayed Link State Acknowledgment packets must be | |
4217 | unicast separately over each adjacency (i.e., neighbor whose | |
4218 | state is >= Exchange). */ | |
4219 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
4220 | struct ospf_neighbor *nbr; | |
4221 | struct route_node *rn; | |
4222 | ||
4223 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
4224 | if ((nbr = rn->info) != NULL) | |
4225 | if (nbr != oi->nbr_self | |
4226 | && nbr->state >= NSM_Exchange) | |
4227 | while (listcount(oi->ls_ack)) | |
4228 | ospf_ls_ack_send_list( | |
4229 | oi, oi->ls_ack, | |
4230 | nbr->address.u.prefix4); | |
4231 | return; | |
4232 | } | |
4233 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
4234 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
4235 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
4236 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4237 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4238 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4239 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) | |
4240 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4241 | else | |
4242 | dst.s_addr = htonl(OSPF_ALLDROUTERS); | |
4243 | ||
4244 | while (listcount(oi->ls_ack)) | |
4245 | ospf_ls_ack_send_list(oi, oi->ls_ack, dst); | |
718e3744 | 4246 | } |
8b6912c2 DS |
4247 | |
4248 | /* | |
4249 | * On pt-to-pt links, all OSPF control packets are sent to the multicast | |
4250 | * address. As a result, the kernel does not need to learn the interface | |
4251 | * MAC of the OSPF neighbor. However, in our world, this will delay | |
4252 | * convergence. Take the case when due to a link flap, all routes now | |
4253 | * want to use an interface which was deemed to be costlier prior to this | |
4254 | * event. For routes that will be installed, the missing MAC will have | |
4255 | * punt-to-CPU set on them. This may overload the CPU control path that | |
4256 | * can be avoided if the MAC was known apriori. | |
4257 | */ | |
89a48046 | 4258 | #define OSPF_PING_NBR_STR_MAX (BUFSIZ) |
d62a17ae | 4259 | void ospf_proactively_arp(struct ospf_neighbor *nbr) |
4260 | { | |
4261 | char ping_nbr[OSPF_PING_NBR_STR_MAX]; | |
d62a17ae | 4262 | int ret; |
4263 | ||
4264 | if (!nbr || !nbr->oi || !nbr->oi->ifp) | |
4265 | return; | |
4266 | ||
89a48046 | 4267 | snprintf(ping_nbr, sizeof(ping_nbr), |
996c9314 LB |
4268 | "ping -c 1 -I %s %s > /dev/null 2>&1 &", nbr->oi->ifp->name, |
4269 | inet_ntoa(nbr->address.u.prefix4)); | |
89a48046 | 4270 | |
d62a17ae | 4271 | ret = system(ping_nbr); |
4272 | if (IS_DEBUG_OSPF_EVENT) | |
4273 | zlog_debug("Executed %s %s", ping_nbr, | |
4274 | ((ret == 0) ? "successfully" : "but failed")); | |
8b6912c2 | 4275 | } |