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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" |
0513a271 | 36 | #ifdef CRYPTO_INTERNAL |
c1a03d47 | 37 | #include "md5.h" |
0513a271 | 38 | #endif |
7e2b7603 | 39 | #include "vrf.h" |
c9cc11f6 | 40 | #include "lib_errors.h" |
718e3744 | 41 | |
42 | #include "ospfd/ospfd.h" | |
43 | #include "ospfd/ospf_network.h" | |
44 | #include "ospfd/ospf_interface.h" | |
45 | #include "ospfd/ospf_ism.h" | |
46 | #include "ospfd/ospf_asbr.h" | |
47 | #include "ospfd/ospf_lsa.h" | |
48 | #include "ospfd/ospf_lsdb.h" | |
49 | #include "ospfd/ospf_neighbor.h" | |
50 | #include "ospfd/ospf_nsm.h" | |
51 | #include "ospfd/ospf_packet.h" | |
52 | #include "ospfd/ospf_spf.h" | |
53 | #include "ospfd/ospf_flood.h" | |
54 | #include "ospfd/ospf_dump.h" | |
c9cc11f6 | 55 | #include "ospfd/ospf_errors.h" |
718e3744 | 56 | |
166b75c2 DS |
57 | /* |
58 | * OSPF Fragmentation / fragmented writes | |
59 | * | |
60 | * ospfd can support writing fragmented packets, for cases where | |
61 | * kernel will not fragment IP_HDRINCL and/or multicast destined | |
62 | * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However, | |
63 | * SunOS, probably BSD too, clobber the user supplied IP ID and IP | |
64 | * flags fields, hence user-space fragmentation will not work. | |
65 | * Only Linux is known to leave IP header unmolested. | |
66 | * Further, fragmentation really should be done the kernel, which already | |
67 | * supports it, and which avoids nasty IP ID state problems. | |
68 | * | |
69 | * Fragmentation of OSPF packets can be required on networks with router | |
70 | * with many many interfaces active in one area, or on networks with links | |
71 | * with low MTUs. | |
72 | */ | |
73 | #ifdef GNU_LINUX | |
74 | #define WANT_OSPF_WRITE_FRAGMENT | |
75 | #endif | |
76 | ||
718e3744 | 77 | /* Packet Type String. */ |
d62a17ae | 78 | const struct message ospf_packet_type_str[] = { |
79 | {OSPF_MSG_HELLO, "Hello"}, | |
80 | {OSPF_MSG_DB_DESC, "Database Description"}, | |
81 | {OSPF_MSG_LS_REQ, "Link State Request"}, | |
82 | {OSPF_MSG_LS_UPD, "Link State Update"}, | |
83 | {OSPF_MSG_LS_ACK, "Link State Acknowledgment"}, | |
84 | {0}}; | |
718e3744 | 85 | |
75c8eabb DO |
86 | /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of |
87 | particular types, offset is the "type" field of a packet. */ | |
d7c0a89a | 88 | static const uint16_t ospf_packet_minlen[] = { |
d62a17ae | 89 | 0, |
90 | OSPF_HELLO_MIN_SIZE, | |
91 | OSPF_DB_DESC_MIN_SIZE, | |
92 | OSPF_LS_REQ_MIN_SIZE, | |
93 | OSPF_LS_UPD_MIN_SIZE, | |
94 | OSPF_LS_ACK_MIN_SIZE, | |
75c8eabb DO |
95 | }; |
96 | ||
4e31de79 DO |
97 | /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular |
98 | types, offset is the "LSA type" field. */ | |
d7c0a89a | 99 | static const uint16_t ospf_lsa_minlen[] = { |
d62a17ae | 100 | 0, |
101 | OSPF_ROUTER_LSA_MIN_SIZE, | |
102 | OSPF_NETWORK_LSA_MIN_SIZE, | |
103 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
104 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
105 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
106 | 0, | |
107 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
108 | 0, | |
109 | 0, | |
110 | 0, | |
111 | 0, | |
4e31de79 DO |
112 | }; |
113 | ||
bd5651f0 | 114 | /* for ospf_check_auth() */ |
d62a17ae | 115 | static int ospf_check_sum(struct ospf_header *); |
bd5651f0 | 116 | |
718e3744 | 117 | /* OSPF authentication checking function */ |
d62a17ae | 118 | static int ospf_auth_type(struct ospf_interface *oi) |
718e3744 | 119 | { |
d62a17ae | 120 | int auth_type; |
718e3744 | 121 | |
d62a17ae | 122 | if (OSPF_IF_PARAM(oi, auth_type) == OSPF_AUTH_NOTSET) |
123 | auth_type = oi->area->auth_type; | |
124 | else | |
125 | auth_type = OSPF_IF_PARAM(oi, auth_type); | |
718e3744 | 126 | |
d62a17ae | 127 | /* Handle case where MD5 key list is not configured aka Cisco */ |
128 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC | |
129 | && list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) | |
130 | return OSPF_AUTH_NULL; | |
718e3744 | 131 | |
d62a17ae | 132 | return auth_type; |
718e3744 | 133 | } |
134 | ||
7cec50a5 | 135 | static struct ospf_packet *ospf_packet_new(size_t size) |
718e3744 | 136 | { |
d62a17ae | 137 | struct ospf_packet *new; |
718e3744 | 138 | |
d62a17ae | 139 | new = XCALLOC(MTYPE_OSPF_PACKET, sizeof(struct ospf_packet)); |
140 | new->s = stream_new(size); | |
718e3744 | 141 | |
d62a17ae | 142 | return new; |
718e3744 | 143 | } |
144 | ||
d62a17ae | 145 | void ospf_packet_free(struct ospf_packet *op) |
718e3744 | 146 | { |
d62a17ae | 147 | if (op->s) |
148 | stream_free(op->s); | |
718e3744 | 149 | |
d62a17ae | 150 | XFREE(MTYPE_OSPF_PACKET, op); |
718e3744 | 151 | } |
152 | ||
4d762f26 | 153 | struct ospf_fifo *ospf_fifo_new(void) |
718e3744 | 154 | { |
d62a17ae | 155 | struct ospf_fifo *new; |
718e3744 | 156 | |
d62a17ae | 157 | new = XCALLOC(MTYPE_OSPF_FIFO, sizeof(struct ospf_fifo)); |
158 | return new; | |
718e3744 | 159 | } |
160 | ||
161 | /* Add new packet to fifo. */ | |
d62a17ae | 162 | void ospf_fifo_push(struct ospf_fifo *fifo, struct ospf_packet *op) |
718e3744 | 163 | { |
d62a17ae | 164 | if (fifo->tail) |
165 | fifo->tail->next = op; | |
166 | else | |
167 | fifo->head = op; | |
718e3744 | 168 | |
d62a17ae | 169 | fifo->tail = op; |
718e3744 | 170 | |
d62a17ae | 171 | fifo->count++; |
718e3744 | 172 | } |
173 | ||
aa276fd7 | 174 | /* Add new packet to head of fifo. */ |
d62a17ae | 175 | static void ospf_fifo_push_head(struct ospf_fifo *fifo, struct ospf_packet *op) |
aa276fd7 | 176 | { |
d62a17ae | 177 | op->next = fifo->head; |
178 | ||
179 | if (fifo->tail == NULL) | |
180 | fifo->tail = op; | |
181 | ||
182 | fifo->head = op; | |
183 | ||
184 | fifo->count++; | |
aa276fd7 PJ |
185 | } |
186 | ||
718e3744 | 187 | /* Delete first packet from fifo. */ |
d62a17ae | 188 | struct ospf_packet *ospf_fifo_pop(struct ospf_fifo *fifo) |
718e3744 | 189 | { |
d62a17ae | 190 | struct ospf_packet *op; |
718e3744 | 191 | |
d62a17ae | 192 | op = fifo->head; |
718e3744 | 193 | |
d62a17ae | 194 | if (op) { |
195 | fifo->head = op->next; | |
718e3744 | 196 | |
d62a17ae | 197 | if (fifo->head == NULL) |
198 | fifo->tail = NULL; | |
718e3744 | 199 | |
d62a17ae | 200 | fifo->count--; |
201 | } | |
718e3744 | 202 | |
d62a17ae | 203 | return op; |
718e3744 | 204 | } |
205 | ||
206 | /* Return first fifo entry. */ | |
d62a17ae | 207 | struct ospf_packet *ospf_fifo_head(struct ospf_fifo *fifo) |
718e3744 | 208 | { |
d62a17ae | 209 | return fifo->head; |
718e3744 | 210 | } |
211 | ||
212 | /* Flush ospf packet fifo. */ | |
d62a17ae | 213 | void ospf_fifo_flush(struct ospf_fifo *fifo) |
718e3744 | 214 | { |
d62a17ae | 215 | struct ospf_packet *op; |
216 | struct ospf_packet *next; | |
718e3744 | 217 | |
d62a17ae | 218 | for (op = fifo->head; op; op = next) { |
219 | next = op->next; | |
220 | ospf_packet_free(op); | |
221 | } | |
222 | fifo->head = fifo->tail = NULL; | |
223 | fifo->count = 0; | |
718e3744 | 224 | } |
225 | ||
226 | /* Free ospf packet fifo. */ | |
d62a17ae | 227 | void ospf_fifo_free(struct ospf_fifo *fifo) |
718e3744 | 228 | { |
d62a17ae | 229 | ospf_fifo_flush(fifo); |
718e3744 | 230 | |
d62a17ae | 231 | XFREE(MTYPE_OSPF_FIFO, fifo); |
718e3744 | 232 | } |
233 | ||
7cec50a5 | 234 | static void ospf_packet_add(struct ospf_interface *oi, struct ospf_packet *op) |
718e3744 | 235 | { |
d62a17ae | 236 | /* Add packet to end of queue. */ |
237 | ospf_fifo_push(oi->obuf, op); | |
718e3744 | 238 | |
d62a17ae | 239 | /* Debug of packet fifo*/ |
240 | /* ospf_fifo_debug (oi->obuf); */ | |
718e3744 | 241 | } |
242 | ||
d62a17ae | 243 | static void ospf_packet_add_top(struct ospf_interface *oi, |
244 | struct ospf_packet *op) | |
aa276fd7 | 245 | { |
d62a17ae | 246 | /* Add packet to head of queue. */ |
247 | ospf_fifo_push_head(oi->obuf, op); | |
aa276fd7 | 248 | |
d62a17ae | 249 | /* Debug of packet fifo*/ |
250 | /* ospf_fifo_debug (oi->obuf); */ | |
aa276fd7 PJ |
251 | } |
252 | ||
7cec50a5 | 253 | static void ospf_packet_delete(struct ospf_interface *oi) |
718e3744 | 254 | { |
d62a17ae | 255 | struct ospf_packet *op; |
256 | ||
257 | op = ospf_fifo_pop(oi->obuf); | |
718e3744 | 258 | |
d62a17ae | 259 | if (op) |
260 | ospf_packet_free(op); | |
718e3744 | 261 | } |
262 | ||
7cec50a5 | 263 | static struct ospf_packet *ospf_packet_dup(struct ospf_packet *op) |
718e3744 | 264 | { |
d62a17ae | 265 | struct ospf_packet *new; |
718e3744 | 266 | |
d62a17ae | 267 | if (stream_get_endp(op->s) != op->length) |
268 | /* XXX size_t */ | |
c9cc11f6 | 269 | zlog_debug( |
d62a17ae | 270 | "ospf_packet_dup stream %lu ospf_packet %u size mismatch", |
d7c0a89a | 271 | (unsigned long)STREAM_SIZE(op->s), op->length); |
30961a15 | 272 | |
d62a17ae | 273 | /* Reserve space for MD5 authentication that may be added later. */ |
274 | new = ospf_packet_new(stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
275 | stream_copy(new->s, op->s); | |
718e3744 | 276 | |
d62a17ae | 277 | new->dst = op->dst; |
278 | new->length = op->length; | |
718e3744 | 279 | |
d62a17ae | 280 | return new; |
718e3744 | 281 | } |
282 | ||
86f1fd96 | 283 | /* XXX inline */ |
d62a17ae | 284 | static unsigned int ospf_packet_authspace(struct ospf_interface *oi) |
86f1fd96 | 285 | { |
d62a17ae | 286 | int auth = 0; |
86f1fd96 | 287 | |
d62a17ae | 288 | if (ospf_auth_type(oi) == OSPF_AUTH_CRYPTOGRAPHIC) |
289 | auth = OSPF_AUTH_MD5_SIZE; | |
86f1fd96 | 290 | |
d62a17ae | 291 | return auth; |
86f1fd96 | 292 | } |
293 | ||
d62a17ae | 294 | static unsigned int ospf_packet_max(struct ospf_interface *oi) |
718e3744 | 295 | { |
d62a17ae | 296 | int max; |
718e3744 | 297 | |
d62a17ae | 298 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
86f1fd96 | 299 | |
d62a17ae | 300 | max -= (OSPF_HEADER_SIZE + sizeof(struct ip)); |
718e3744 | 301 | |
d62a17ae | 302 | return max; |
718e3744 | 303 | } |
304 | ||
6b0655a2 | 305 | |
d62a17ae | 306 | static int ospf_check_md5_digest(struct ospf_interface *oi, |
307 | struct ospf_header *ospfh) | |
718e3744 | 308 | { |
0513a271 MR |
309 | #ifdef CRYPTO_OPENSSL |
310 | EVP_MD_CTX *ctx; | |
311 | #elif CRYPTO_INTERNAL | |
d62a17ae | 312 | MD5_CTX ctx; |
0513a271 | 313 | #endif |
d62a17ae | 314 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; |
315 | struct crypt_key *ck; | |
316 | struct ospf_neighbor *nbr; | |
d7c0a89a | 317 | uint16_t length = ntohs(ospfh->length); |
d62a17ae | 318 | |
319 | /* Get secret key. */ | |
320 | ck = ospf_crypt_key_lookup(OSPF_IF_PARAM(oi, auth_crypt), | |
321 | ospfh->u.crypt.key_id); | |
322 | if (ck == NULL) { | |
1c50c1c0 QY |
323 | flog_warn(EC_OSPF_MD5, "interface %s: ospf_check_md5 no key %d", |
324 | IF_NAME(oi), ospfh->u.crypt.key_id); | |
d62a17ae | 325 | return 0; |
326 | } | |
718e3744 | 327 | |
d62a17ae | 328 | /* check crypto seqnum. */ |
329 | nbr = ospf_nbr_lookup_by_routerid(oi->nbrs, &ospfh->router_id); | |
718e3744 | 330 | |
d62a17ae | 331 | if (nbr |
332 | && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) { | |
c9cc11f6 | 333 | flog_warn( |
cf444bcf | 334 | EC_OSPF_MD5, |
d62a17ae | 335 | "interface %s: ospf_check_md5 bad sequence %d (expect %d)", |
336 | IF_NAME(oi), ntohl(ospfh->u.crypt.crypt_seqnum), | |
337 | ntohl(nbr->crypt_seqnum)); | |
338 | return 0; | |
339 | } | |
718e3744 | 340 | |
d62a17ae | 341 | /* Generate a digest for the ospf packet - their digest + our digest. */ |
0513a271 MR |
342 | #ifdef CRYPTO_OPENSSL |
343 | unsigned int md5_size = OSPF_AUTH_MD5_SIZE; | |
344 | ctx = EVP_MD_CTX_new(); | |
345 | EVP_DigestInit(ctx, EVP_md5()); | |
346 | EVP_DigestUpdate(ctx, ospfh, length); | |
347 | EVP_DigestUpdate(ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); | |
348 | EVP_DigestFinal(ctx, digest, &md5_size); | |
349 | EVP_MD_CTX_free(ctx); | |
350 | #elif CRYPTO_INTERNAL | |
d62a17ae | 351 | memset(&ctx, 0, sizeof(ctx)); |
352 | MD5Init(&ctx); | |
353 | MD5Update(&ctx, ospfh, length); | |
354 | MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); | |
355 | MD5Final(digest, &ctx); | |
0513a271 | 356 | #endif |
d62a17ae | 357 | |
358 | /* compare the two */ | |
359 | if (memcmp((caddr_t)ospfh + length, digest, OSPF_AUTH_MD5_SIZE)) { | |
cf444bcf | 360 | flog_warn(EC_OSPF_MD5, |
c9cc11f6 | 361 | "interface %s: ospf_check_md5 checksum mismatch", |
d62a17ae | 362 | IF_NAME(oi)); |
363 | return 0; | |
364 | } | |
718e3744 | 365 | |
d62a17ae | 366 | /* save neighbor's crypt_seqnum */ |
367 | if (nbr) | |
368 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
369 | return 1; | |
718e3744 | 370 | } |
371 | ||
372 | /* This function is called from ospf_write(), it will detect the | |
373 | authentication scheme and if it is MD5, it will change the sequence | |
374 | and update the MD5 digest. */ | |
d62a17ae | 375 | static int ospf_make_md5_digest(struct ospf_interface *oi, |
376 | struct ospf_packet *op) | |
377 | { | |
378 | struct ospf_header *ospfh; | |
379 | unsigned char digest[OSPF_AUTH_MD5_SIZE] = {0}; | |
0513a271 MR |
380 | #ifdef CRYPTO_OPENSSL |
381 | EVP_MD_CTX *ctx; | |
382 | #elif CRYPTO_INTERNAL | |
d62a17ae | 383 | MD5_CTX ctx; |
0513a271 | 384 | #endif |
d62a17ae | 385 | void *ibuf; |
d7c0a89a | 386 | uint32_t t; |
d62a17ae | 387 | struct crypt_key *ck; |
d7c0a89a | 388 | const uint8_t *auth_key; |
d62a17ae | 389 | |
390 | ibuf = STREAM_DATA(op->s); | |
391 | ospfh = (struct ospf_header *)ibuf; | |
392 | ||
393 | if (ntohs(ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
394 | return 0; | |
395 | ||
396 | /* We do this here so when we dup a packet, we don't have to | |
397 | waste CPU rewriting other headers. | |
398 | ||
399 | Note that quagga_time /deliberately/ is not used here */ | |
400 | t = (time(NULL) & 0xFFFFFFFF); | |
401 | if (t > oi->crypt_seqnum) | |
402 | oi->crypt_seqnum = t; | |
403 | else | |
404 | oi->crypt_seqnum++; | |
405 | ||
406 | ospfh->u.crypt.crypt_seqnum = htonl(oi->crypt_seqnum); | |
407 | ||
408 | /* Get MD5 Authentication key from auth_key list. */ | |
409 | if (list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) | |
d7c0a89a | 410 | auth_key = (const uint8_t *)digest; |
d62a17ae | 411 | else { |
412 | ck = listgetdata(listtail(OSPF_IF_PARAM(oi, auth_crypt))); | |
413 | auth_key = ck->auth_key; | |
414 | } | |
718e3744 | 415 | |
d62a17ae | 416 | /* Generate a digest for the entire packet + our secret key. */ |
0513a271 MR |
417 | #ifdef CRYPTO_OPENSSL |
418 | unsigned int md5_size = OSPF_AUTH_MD5_SIZE; | |
419 | ctx = EVP_MD_CTX_new(); | |
420 | EVP_DigestInit(ctx, EVP_md5()); | |
421 | EVP_DigestUpdate(ctx, ibuf, ntohs(ospfh->length)); | |
422 | EVP_DigestUpdate(ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
423 | EVP_DigestFinal(ctx, digest, &md5_size); | |
424 | EVP_MD_CTX_free(ctx); | |
425 | #elif CRYPTO_INTERNAL | |
d62a17ae | 426 | memset(&ctx, 0, sizeof(ctx)); |
427 | MD5Init(&ctx); | |
428 | MD5Update(&ctx, ibuf, ntohs(ospfh->length)); | |
429 | MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
430 | MD5Final(digest, &ctx); | |
0513a271 | 431 | #endif |
718e3744 | 432 | |
d62a17ae | 433 | /* Append md5 digest to the end of the stream. */ |
434 | stream_put(op->s, digest, OSPF_AUTH_MD5_SIZE); | |
718e3744 | 435 | |
d62a17ae | 436 | /* We do *NOT* increment the OSPF header length. */ |
437 | op->length = ntohs(ospfh->length) + OSPF_AUTH_MD5_SIZE; | |
30961a15 | 438 | |
d62a17ae | 439 | if (stream_get_endp(op->s) != op->length) |
440 | /* XXX size_t */ | |
c9cc11f6 | 441 | flog_warn( |
cf444bcf | 442 | EC_OSPF_MD5, |
d62a17ae | 443 | "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u", |
d7c0a89a | 444 | (unsigned long)stream_get_endp(op->s), op->length); |
718e3744 | 445 | |
d62a17ae | 446 | return OSPF_AUTH_MD5_SIZE; |
718e3744 | 447 | } |
448 | ||
6b0655a2 | 449 | |
d62a17ae | 450 | static int ospf_ls_req_timer(struct thread *thread) |
718e3744 | 451 | { |
d62a17ae | 452 | struct ospf_neighbor *nbr; |
718e3744 | 453 | |
d62a17ae | 454 | nbr = THREAD_ARG(thread); |
455 | nbr->t_ls_req = NULL; | |
718e3744 | 456 | |
d62a17ae | 457 | /* Send Link State Request. */ |
458 | if (ospf_ls_request_count(nbr)) | |
459 | ospf_ls_req_send(nbr); | |
718e3744 | 460 | |
d62a17ae | 461 | /* Set Link State Request retransmission timer. */ |
462 | OSPF_NSM_TIMER_ON(nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
718e3744 | 463 | |
d62a17ae | 464 | return 0; |
718e3744 | 465 | } |
466 | ||
d62a17ae | 467 | void ospf_ls_req_event(struct ospf_neighbor *nbr) |
718e3744 | 468 | { |
d62a17ae | 469 | if (nbr->t_ls_req) { |
470 | thread_cancel(nbr->t_ls_req); | |
471 | nbr->t_ls_req = NULL; | |
472 | } | |
473 | nbr->t_ls_req = NULL; | |
474 | thread_add_event(master, ospf_ls_req_timer, nbr, 0, &nbr->t_ls_req); | |
718e3744 | 475 | } |
476 | ||
477 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
478 | ospf_neighbor.c */ | |
d62a17ae | 479 | int ospf_ls_upd_timer(struct thread *thread) |
480 | { | |
481 | struct ospf_neighbor *nbr; | |
482 | ||
483 | nbr = THREAD_ARG(thread); | |
484 | nbr->t_ls_upd = NULL; | |
485 | ||
486 | /* Send Link State Update. */ | |
487 | if (ospf_ls_retransmit_count(nbr) > 0) { | |
488 | struct list *update; | |
489 | struct ospf_lsdb *lsdb; | |
490 | int i; | |
491 | int retransmit_interval; | |
492 | ||
493 | retransmit_interval = | |
494 | OSPF_IF_PARAM(nbr->oi, retransmit_interval); | |
495 | ||
496 | lsdb = &nbr->ls_rxmt; | |
497 | update = list_new(); | |
498 | ||
499 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { | |
500 | struct route_table *table = lsdb->type[i].db; | |
501 | struct route_node *rn; | |
502 | ||
503 | for (rn = route_top(table); rn; rn = route_next(rn)) { | |
504 | struct ospf_lsa *lsa; | |
505 | ||
506 | if ((lsa = rn->info) != NULL) { | |
507 | /* Don't retransmit an LSA if we | |
508 | received it within | |
509 | the last RxmtInterval seconds - this | |
510 | is to allow the | |
511 | neighbour a chance to acknowledge the | |
512 | LSA as it may | |
513 | have ben just received before the | |
514 | retransmit timer | |
515 | fired. This is a small tweak to what | |
516 | is in the RFC, | |
517 | but it will cut out out a lot of | |
518 | retransmit traffic | |
519 | - MAG */ | |
520 | if (monotime_since(&lsa->tv_recv, NULL) | |
521 | >= retransmit_interval * 1000000LL) | |
522 | listnode_add(update, rn->info); | |
523 | } | |
524 | } | |
525 | } | |
718e3744 | 526 | |
d62a17ae | 527 | if (listcount(update) > 0) |
996c9314 LB |
528 | ospf_ls_upd_send(nbr, update, OSPF_SEND_PACKET_DIRECT, |
529 | 0); | |
6a154c88 | 530 | list_delete(&update); |
718e3744 | 531 | } |
532 | ||
d62a17ae | 533 | /* Set LS Update retransmission timer. */ |
534 | OSPF_NSM_TIMER_ON(nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
718e3744 | 535 | |
d62a17ae | 536 | return 0; |
718e3744 | 537 | } |
538 | ||
d62a17ae | 539 | int ospf_ls_ack_timer(struct thread *thread) |
718e3744 | 540 | { |
d62a17ae | 541 | struct ospf_interface *oi; |
718e3744 | 542 | |
d62a17ae | 543 | oi = THREAD_ARG(thread); |
544 | oi->t_ls_ack = NULL; | |
718e3744 | 545 | |
d62a17ae | 546 | /* Send Link State Acknowledgment. */ |
547 | if (listcount(oi->ls_ack) > 0) | |
548 | ospf_ls_ack_send_delayed(oi); | |
718e3744 | 549 | |
d62a17ae | 550 | /* Set LS Ack timer. */ |
551 | OSPF_ISM_TIMER_ON(oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
718e3744 | 552 | |
d62a17ae | 553 | return 0; |
718e3744 | 554 | } |
555 | ||
0bfeca3f | 556 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 557 | static void ospf_write_frags(int fd, struct ospf_packet *op, struct ip *iph, |
558 | struct msghdr *msg, unsigned int maxdatasize, | |
d7c0a89a | 559 | unsigned int mtu, int flags, uint8_t type) |
0bfeca3f | 560 | { |
561 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
d7c0a89a | 562 | uint16_t offset; |
d62a17ae | 563 | struct iovec *iovp; |
564 | int ret; | |
565 | ||
566 | assert(op->length == stream_get_endp(op->s)); | |
567 | assert(msg->msg_iovlen == 2); | |
568 | ||
569 | /* we can but try. | |
570 | * | |
571 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
572 | * well as the IP_MF flag, making this all quite pointless. | |
573 | * | |
574 | * However, for a system on which IP_MF is left alone, and ip_id left | |
575 | * alone or else which sets same ip_id for each fragment this might | |
576 | * work, eg linux. | |
577 | * | |
578 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
579 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
580 | * be raised against the various kernels. | |
581 | */ | |
582 | ||
583 | /* set More Frag */ | |
584 | iph->ip_off |= IP_MF; | |
585 | ||
586 | /* ip frag offset is expressed in units of 8byte words */ | |
587 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
588 | ||
589 | iovp = &msg->msg_iov[1]; | |
590 | ||
591 | while ((stream_get_endp(op->s) - stream_get_getp(op->s)) | |
592 | > maxdatasize) { | |
593 | /* data length of this frag is to next offset value */ | |
594 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; | |
595 | iph->ip_len = iovp->iov_len + sizeof(struct ip); | |
596 | assert(iph->ip_len <= mtu); | |
597 | ||
598 | sockopt_iphdrincl_swab_htosys(iph); | |
599 | ||
600 | ret = sendmsg(fd, msg, flags); | |
601 | ||
602 | sockopt_iphdrincl_swab_systoh(iph); | |
603 | ||
604 | if (ret < 0) | |
c9cc11f6 | 605 | flog_err( |
450971aa | 606 | EC_LIB_SOCKET, |
d62a17ae | 607 | "*** ospf_write_frags: sendmsg failed to %s," |
608 | " id %d, off %d, len %d, mtu %u failed with %s", | |
609 | inet_ntoa(iph->ip_dst), iph->ip_id, iph->ip_off, | |
610 | iph->ip_len, mtu, safe_strerror(errno)); | |
611 | ||
612 | if (IS_DEBUG_OSPF_PACKET(type - 1, SEND)) { | |
613 | zlog_debug( | |
614 | "ospf_write_frags: sent id %d, off %d, len %d to %s\n", | |
615 | iph->ip_id, iph->ip_off, iph->ip_len, | |
616 | inet_ntoa(iph->ip_dst)); | |
617 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) { | |
618 | zlog_debug( | |
619 | "-----------------IP Header Dump----------------------"); | |
620 | ospf_ip_header_dump(iph); | |
621 | zlog_debug( | |
622 | "-----------------------------------------------------"); | |
623 | } | |
624 | } | |
625 | ||
626 | iph->ip_off += offset; | |
627 | stream_forward_getp(op->s, iovp->iov_len); | |
2d34fb80 | 628 | iovp->iov_base = stream_pnt(op->s); |
d62a17ae | 629 | } |
630 | ||
631 | /* setup for final fragment */ | |
632 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp(op->s); | |
633 | iph->ip_len = iovp->iov_len + sizeof(struct ip); | |
634 | iph->ip_off &= (~IP_MF); | |
0bfeca3f | 635 | } |
636 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
637 | ||
d62a17ae | 638 | static int ospf_write(struct thread *thread) |
639 | { | |
640 | struct ospf *ospf = THREAD_ARG(thread); | |
641 | struct ospf_interface *oi; | |
642 | struct ospf_interface *last_serviced_oi = NULL; | |
643 | struct ospf_packet *op; | |
644 | struct sockaddr_in sa_dst; | |
645 | struct ip iph; | |
646 | struct msghdr msg; | |
647 | struct iovec iov[2]; | |
d7c0a89a | 648 | uint8_t type; |
d62a17ae | 649 | int ret; |
650 | int flags = 0; | |
651 | struct listnode *node; | |
0bfeca3f | 652 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d7c0a89a QY |
653 | static uint16_t ipid = 0; |
654 | uint16_t maxdatasize; | |
9d303b37 | 655 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
68b7339a | 656 | #define OSPF_WRITE_IPHL_SHIFT 2 |
d62a17ae | 657 | int pkt_count = 0; |
e1b18df1 CS |
658 | |
659 | #ifdef GNU_LINUX | |
3e300703 | 660 | unsigned char cmsgbuf[64] = {}; |
e7503eab CS |
661 | struct cmsghdr *cm = (struct cmsghdr *)cmsgbuf; |
662 | struct in_pktinfo *pi; | |
e1b18df1 | 663 | #endif |
d62a17ae | 664 | |
c32eba04 CS |
665 | if (ospf->fd < 0 || ospf->oi_running == 0) { |
666 | if (IS_DEBUG_OSPF_EVENT) | |
667 | zlog_debug( | |
668 | "ospf_write failed to send, fd %d, instance %u" | |
669 | ,ospf->fd, ospf->oi_running); | |
670 | return -1; | |
671 | } | |
672 | ||
d62a17ae | 673 | node = listhead(ospf->oi_write_q); |
674 | assert(node); | |
675 | oi = listgetdata(node); | |
0bfeca3f | 676 | |
677 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
d62a17ae | 678 | /* seed ipid static with low order bits of time */ |
679 | if (ipid == 0) | |
680 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 681 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
682 | ||
d62a17ae | 683 | while ((pkt_count < ospf->write_oi_count) && oi |
684 | && (last_serviced_oi != oi)) { | |
685 | /* If there is only packet in the queue, the oi is removed from | |
686 | write-q, so fix up the last interface that was serviced */ | |
687 | if (last_serviced_oi == NULL) { | |
688 | last_serviced_oi = oi; | |
689 | } | |
690 | pkt_count++; | |
233cc0fb | 691 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 692 | /* convenience - max OSPF data per packet */ |
693 | maxdatasize = oi->ifp->mtu - sizeof(struct ip); | |
233cc0fb | 694 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
d62a17ae | 695 | /* Get one packet from queue. */ |
696 | op = ospf_fifo_head(oi->obuf); | |
697 | assert(op); | |
698 | assert(op->length >= OSPF_HEADER_SIZE); | |
699 | ||
700 | if (op->dst.s_addr == htonl(OSPF_ALLSPFROUTERS) | |
701 | || op->dst.s_addr == htonl(OSPF_ALLDROUTERS)) | |
702 | ospf_if_ipmulticast(ospf, oi->address, | |
703 | oi->ifp->ifindex); | |
704 | ||
705 | /* Rewrite the md5 signature & update the seq */ | |
706 | ospf_make_md5_digest(oi, op); | |
707 | ||
708 | /* Retrieve OSPF packet type. */ | |
709 | stream_set_getp(op->s, 1); | |
710 | type = stream_getc(op->s); | |
711 | ||
712 | /* reset get pointer */ | |
713 | stream_set_getp(op->s, 0); | |
714 | ||
715 | memset(&iph, 0, sizeof(struct ip)); | |
716 | memset(&sa_dst, 0, sizeof(sa_dst)); | |
717 | ||
718 | sa_dst.sin_family = AF_INET; | |
6f0e3f6e | 719 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 720 | sa_dst.sin_len = sizeof(sa_dst); |
6f0e3f6e | 721 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
d62a17ae | 722 | sa_dst.sin_addr = op->dst; |
723 | sa_dst.sin_port = htons(0); | |
724 | ||
725 | /* Set DONTROUTE flag if dst is unicast. */ | |
726 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
727 | if (!IN_MULTICAST(htonl(op->dst.s_addr))) | |
728 | flags = MSG_DONTROUTE; | |
729 | ||
730 | iph.ip_hl = sizeof(struct ip) >> OSPF_WRITE_IPHL_SHIFT; | |
731 | /* it'd be very strange for header to not be 4byte-word aligned | |
732 | * but.. */ | |
733 | if (sizeof(struct ip) | |
734 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT)) | |
735 | iph.ip_hl++; /* we presume sizeof struct ip cant | |
736 | overflow ip_hl.. */ | |
737 | ||
738 | iph.ip_v = IPVERSION; | |
739 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; | |
740 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; | |
68b7339a | 741 | |
0150c9c9 | 742 | #if defined(__DragonFly__) |
d62a17ae | 743 | /* |
744 | * DragonFly's raw socket expects ip_len/ip_off in network byte | |
745 | * order. | |
746 | */ | |
747 | iph.ip_len = htons(iph.ip_len); | |
0150c9c9 DB |
748 | #endif |
749 | ||
0bfeca3f | 750 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 751 | /* XXX-MT: not thread-safe at all.. |
752 | * XXX: this presumes this is only programme sending OSPF | |
753 | * packets | |
754 | * otherwise, no guarantee ipid will be unique | |
755 | */ | |
756 | iph.ip_id = ++ipid; | |
0bfeca3f | 757 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
758 | ||
d62a17ae | 759 | iph.ip_off = 0; |
760 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
761 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
762 | else | |
763 | iph.ip_ttl = OSPF_IP_TTL; | |
764 | iph.ip_p = IPPROTO_OSPFIGP; | |
765 | iph.ip_sum = 0; | |
766 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
767 | iph.ip_dst.s_addr = op->dst.s_addr; | |
768 | ||
769 | memset(&msg, 0, sizeof(msg)); | |
770 | msg.msg_name = (caddr_t)&sa_dst; | |
771 | msg.msg_namelen = sizeof(sa_dst); | |
772 | msg.msg_iov = iov; | |
773 | msg.msg_iovlen = 2; | |
e7503eab | 774 | |
d62a17ae | 775 | iov[0].iov_base = (char *)&iph; |
776 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; | |
2d34fb80 | 777 | iov[1].iov_base = stream_pnt(op->s); |
d62a17ae | 778 | iov[1].iov_len = op->length; |
779 | ||
e1b18df1 CS |
780 | #ifdef GNU_LINUX |
781 | msg.msg_control = (caddr_t)cm; | |
e7503eab CS |
782 | cm->cmsg_level = SOL_IP; |
783 | cm->cmsg_type = IP_PKTINFO; | |
784 | cm->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
785 | pi = (struct in_pktinfo *)CMSG_DATA(cm); | |
786 | pi->ipi_ifindex = oi->ifp->ifindex; | |
787 | ||
788 | msg.msg_controllen = cm->cmsg_len; | |
e1b18df1 | 789 | #endif |
e7503eab | 790 | |
996c9314 LB |
791 | /* Sadly we can not rely on kernels to fragment packets |
792 | * because of either IP_HDRINCL and/or multicast | |
793 | * destination being set. | |
794 | */ | |
e7503eab | 795 | |
0bfeca3f | 796 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
d62a17ae | 797 | if (op->length > maxdatasize) |
798 | ospf_write_frags(ospf->fd, op, &iph, &msg, maxdatasize, | |
799 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 800 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 801 | |
d62a17ae | 802 | /* send final fragment (could be first) */ |
803 | sockopt_iphdrincl_swab_htosys(&iph); | |
804 | ret = sendmsg(ospf->fd, &msg, flags); | |
805 | sockopt_iphdrincl_swab_systoh(&iph); | |
806 | if (IS_DEBUG_OSPF_EVENT) | |
807 | zlog_debug( | |
808 | "ospf_write to %s, " | |
809 | "id %d, off %d, len %d, interface %s, mtu %u:", | |
810 | inet_ntoa(iph.ip_dst), iph.ip_id, iph.ip_off, | |
811 | iph.ip_len, oi->ifp->name, oi->ifp->mtu); | |
812 | ||
813 | if (ret < 0) | |
c9cc11f6 | 814 | flog_err( |
450971aa | 815 | EC_LIB_SOCKET, |
d62a17ae | 816 | "*** sendmsg in ospf_write failed to %s, " |
817 | "id %d, off %d, len %d, interface %s, mtu %u: %s", | |
818 | inet_ntoa(iph.ip_dst), iph.ip_id, iph.ip_off, | |
819 | iph.ip_len, oi->ifp->name, oi->ifp->mtu, | |
820 | safe_strerror(errno)); | |
821 | ||
822 | /* Show debug sending packet. */ | |
823 | if (IS_DEBUG_OSPF_PACKET(type - 1, SEND)) { | |
824 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) { | |
825 | zlog_debug( | |
826 | "-----------------------------------------------------"); | |
827 | ospf_ip_header_dump(&iph); | |
828 | stream_set_getp(op->s, 0); | |
829 | ospf_packet_dump(op->s); | |
830 | } | |
831 | ||
832 | zlog_debug("%s sent to [%s] via [%s].", | |
833 | lookup_msg(ospf_packet_type_str, type, NULL), | |
834 | inet_ntoa(op->dst), IF_NAME(oi)); | |
835 | ||
836 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) | |
837 | zlog_debug( | |
838 | "-----------------------------------------------------"); | |
839 | } | |
840 | ||
c9339663 | 841 | switch (type) { |
996c9314 LB |
842 | case OSPF_MSG_HELLO: |
843 | oi->hello_out++; | |
844 | break; | |
845 | case OSPF_MSG_DB_DESC: | |
846 | oi->db_desc_out++; | |
847 | break; | |
848 | case OSPF_MSG_LS_REQ: | |
849 | oi->ls_req_out++; | |
850 | break; | |
851 | case OSPF_MSG_LS_UPD: | |
852 | oi->ls_upd_out++; | |
853 | break; | |
854 | case OSPF_MSG_LS_ACK: | |
855 | oi->ls_ack_out++; | |
856 | break; | |
857 | default: | |
858 | break; | |
c9339663 CS |
859 | } |
860 | ||
d62a17ae | 861 | /* Now delete packet from queue. */ |
862 | ospf_packet_delete(oi); | |
863 | ||
864 | /* Move this interface to the tail of write_q to | |
865 | serve everyone in a round robin fashion */ | |
866 | list_delete_node(ospf->oi_write_q, node); | |
867 | if (ospf_fifo_head(oi->obuf) == NULL) { | |
868 | oi->on_write_q = 0; | |
869 | last_serviced_oi = NULL; | |
870 | oi = NULL; | |
871 | } else { | |
872 | listnode_add(ospf->oi_write_q, oi); | |
e8f45e82 | 873 | } |
d62a17ae | 874 | |
875 | /* Setup to service from the head of the queue again */ | |
876 | if (!list_isempty(ospf->oi_write_q)) { | |
877 | node = listhead(ospf->oi_write_q); | |
d62a17ae | 878 | oi = listgetdata(node); |
d62a17ae | 879 | } |
880 | } | |
881 | ||
882 | /* If packets still remain in queue, call write thread. */ | |
4bb420ab | 883 | if (!list_isempty(ospf->oi_write_q)) |
d62a17ae | 884 | thread_add_write(master, ospf_write, ospf, ospf->fd, |
885 | &ospf->t_write); | |
718e3744 | 886 | |
d62a17ae | 887 | return 0; |
718e3744 | 888 | } |
889 | ||
890 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
d62a17ae | 891 | static void ospf_hello(struct ip *iph, struct ospf_header *ospfh, |
892 | struct stream *s, struct ospf_interface *oi, int size) | |
893 | { | |
894 | struct ospf_hello *hello; | |
895 | struct ospf_neighbor *nbr; | |
896 | int old_state; | |
897 | struct prefix p; | |
898 | ||
899 | /* increment statistics. */ | |
900 | oi->hello_in++; | |
901 | ||
2d34fb80 | 902 | hello = (struct ospf_hello *)stream_pnt(s); |
d62a17ae | 903 | |
904 | /* If Hello is myself, silently discard. */ | |
905 | if (IPV4_ADDR_SAME(&ospfh->router_id, &oi->ospf->router_id)) { | |
906 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) { | |
907 | zlog_debug( | |
908 | "ospf_header[%s/%s]: selforiginated, " | |
909 | "dropping.", | |
910 | lookup_msg(ospf_packet_type_str, ospfh->type, | |
911 | NULL), | |
912 | inet_ntoa(iph->ip_src)); | |
913 | } | |
914 | return; | |
915 | } | |
916 | ||
917 | /* get neighbor prefix. */ | |
918 | p.family = AF_INET; | |
919 | p.prefixlen = ip_masklen(hello->network_mask); | |
920 | p.u.prefix4 = iph->ip_src; | |
921 | ||
922 | /* Compare network mask. */ | |
923 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
924 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
925 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
926 | if (oi->address->prefixlen != p.prefixlen) { | |
c9cc11f6 | 927 | flog_warn( |
cf444bcf | 928 | EC_OSPF_PACKET, |
d62a17ae | 929 | "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).", |
930 | inet_ntoa(ospfh->router_id), IF_NAME(oi), | |
931 | (int)oi->address->prefixlen, (int)p.prefixlen); | |
932 | return; | |
933 | } | |
934 | ||
935 | /* Compare Router Dead Interval. */ | |
936 | if (OSPF_IF_PARAM(oi, v_wait) != ntohl(hello->dead_interval)) { | |
cf444bcf | 937 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 DS |
938 | "Packet %s [Hello:RECV]: RouterDeadInterval mismatch " |
939 | "(expected %u, but received %u).", | |
940 | inet_ntoa(ospfh->router_id), | |
941 | OSPF_IF_PARAM(oi, v_wait), | |
942 | ntohl(hello->dead_interval)); | |
d62a17ae | 943 | return; |
944 | } | |
945 | ||
946 | /* Compare Hello Interval - ignored if fast-hellos are set. */ | |
947 | if (OSPF_IF_PARAM(oi, fast_hello) == 0) { | |
948 | if (OSPF_IF_PARAM(oi, v_hello) | |
949 | != ntohs(hello->hello_interval)) { | |
c9cc11f6 | 950 | flog_warn( |
cf444bcf | 951 | EC_OSPF_PACKET, |
d62a17ae | 952 | "Packet %s [Hello:RECV]: HelloInterval mismatch " |
953 | "(expected %u, but received %u).", | |
954 | inet_ntoa(ospfh->router_id), | |
955 | OSPF_IF_PARAM(oi, v_hello), | |
956 | ntohs(hello->hello_interval)); | |
957 | return; | |
958 | } | |
959 | } | |
960 | ||
961 | if (IS_DEBUG_OSPF_EVENT) | |
b5a8894d | 962 | zlog_debug("Packet %s [Hello:RECV]: Options %s vrf %s", |
d62a17ae | 963 | inet_ntoa(ospfh->router_id), |
b5a8894d CS |
964 | ospf_options_dump(hello->options), |
965 | ospf_vrf_id_to_name(oi->ospf->vrf_id)); | |
d62a17ae | 966 | |
967 | /* Compare options. */ | |
718e3744 | 968 | #define REJECT_IF_TBIT_ON 1 /* XXX */ |
969 | #ifdef REJECT_IF_TBIT_ON | |
d62a17ae | 970 | if (CHECK_FLAG(hello->options, OSPF_OPTION_MT)) { |
971 | /* | |
972 | * This router does not support non-zero TOS. | |
973 | * Drop this Hello packet not to establish neighbor | |
974 | * relationship. | |
975 | */ | |
cf444bcf | 976 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 977 | "Packet %s [Hello:RECV]: T-bit on, drop it.", |
d62a17ae | 978 | inet_ntoa(ospfh->router_id)); |
979 | return; | |
980 | } | |
718e3744 | 981 | #endif /* REJECT_IF_TBIT_ON */ |
982 | ||
d62a17ae | 983 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
984 | && CHECK_FLAG(hello->options, OSPF_OPTION_O)) { | |
985 | /* | |
986 | * This router does know the correct usage of O-bit | |
987 | * the bit should be set in DD packet only. | |
988 | */ | |
cf444bcf | 989 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 990 | "Packet %s [Hello:RECV]: O-bit abuse?", |
d62a17ae | 991 | inet_ntoa(ospfh->router_id)); |
718e3744 | 992 | #ifdef STRICT_OBIT_USAGE_CHECK |
d62a17ae | 993 | return; /* Reject this packet. */ |
994 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
995 | UNSET_FLAG(hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
996 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
997 | } | |
718e3744 | 998 | |
d62a17ae | 999 | /* new for NSSA is to ensure that NP is on and E is off */ |
1000 | ||
1001 | if (oi->area->external_routing == OSPF_AREA_NSSA) { | |
1002 | if (!(CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_NP) | |
1003 | && CHECK_FLAG(hello->options, OSPF_OPTION_NP) | |
1004 | && !CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_E) | |
1005 | && !CHECK_FLAG(hello->options, OSPF_OPTION_E))) { | |
c9cc11f6 | 1006 | flog_warn( |
cf444bcf | 1007 | EC_OSPF_PACKET, |
d62a17ae | 1008 | "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", |
1009 | inet_ntoa(ospfh->router_id), OPTIONS(oi), | |
1010 | hello->options); | |
1011 | return; | |
1012 | } | |
1013 | if (IS_DEBUG_OSPF_NSSA) | |
1014 | zlog_debug("NSSA-Hello:RECV:Packet from %s:", | |
1015 | inet_ntoa(ospfh->router_id)); | |
1016 | } else | |
1017 | /* The setting of the E-bit found in the Hello Packet's Options | |
1018 | field must match this area's ExternalRoutingCapability A | |
1019 | mismatch causes processing to stop and the packet to be | |
1020 | dropped. The setting of the rest of the bits in the Hello | |
1021 | Packet's Options field should be ignored. */ | |
1022 | if (CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_E) | |
1023 | != CHECK_FLAG(hello->options, OSPF_OPTION_E)) { | |
c9cc11f6 | 1024 | flog_warn( |
cf444bcf | 1025 | EC_OSPF_PACKET, |
d62a17ae | 1026 | "Packet %s [Hello:RECV]: my options: %x, his options %x", |
1027 | inet_ntoa(ospfh->router_id), OPTIONS(oi), | |
1028 | hello->options); | |
1029 | return; | |
1030 | } | |
718e3744 | 1031 | |
d62a17ae | 1032 | /* get neighbour struct */ |
1033 | nbr = ospf_nbr_get(oi, ospfh, iph, &p); | |
1034 | ||
1035 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
1036 | assert(nbr); | |
1037 | ||
1038 | old_state = nbr->state; | |
1039 | ||
1040 | /* Add event to thread. */ | |
1041 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1042 | ||
1043 | /* RFC2328 Section 9.5.1 | |
1044 | If the router is not eligible to become Designated Router, | |
1045 | (snip) It must also send an Hello Packet in reply to an | |
1046 | Hello Packet received from any eligible neighbor (other than | |
1047 | the current Designated Router and Backup Designated Router). */ | |
1048 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1049 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
1050 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
1051 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
1052 | OSPF_NSM_TIMER_ON(nbr->t_hello_reply, | |
1053 | ospf_hello_reply_timer, | |
1054 | OSPF_HELLO_REPLY_DELAY); | |
1055 | ||
1056 | /* on NBMA network type, it happens to receive bidirectional Hello | |
1057 | packet | |
1058 | without advance 1-Way Received event. | |
1059 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
1060 | if (oi->type == OSPF_IFTYPE_NBMA | |
1061 | && (old_state == NSM_Down || old_state == NSM_Attempt)) { | |
1062 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_OneWayReceived); | |
1063 | nbr->priority = hello->priority; | |
1064 | nbr->d_router = hello->d_router; | |
1065 | nbr->bd_router = hello->bd_router; | |
1066 | return; | |
1067 | } | |
1068 | ||
1069 | if (ospf_nbr_bidirectional(&oi->ospf->router_id, hello->neighbors, | |
1070 | size - OSPF_HELLO_MIN_SIZE)) { | |
1071 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_TwoWayReceived); | |
1072 | nbr->options |= hello->options; | |
1073 | } else { | |
1074 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_OneWayReceived); | |
1075 | /* Set neighbor information. */ | |
1076 | nbr->priority = hello->priority; | |
1077 | nbr->d_router = hello->d_router; | |
1078 | nbr->bd_router = hello->bd_router; | |
1079 | return; | |
1080 | } | |
1081 | ||
1082 | /* If neighbor itself declares DR and no BDR exists, | |
1083 | cause event BackupSeen */ | |
1084 | if (IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->d_router)) | |
1085 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
1086 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_BackupSeen); | |
1087 | ||
1088 | /* neighbor itself declares BDR. */ | |
1089 | if (oi->state == ISM_Waiting | |
1090 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->bd_router)) | |
1091 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_BackupSeen); | |
1092 | ||
1093 | /* had not previously. */ | |
1094 | if ((IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->d_router) | |
1095 | && IPV4_ADDR_CMP(&nbr->address.u.prefix4, &nbr->d_router)) | |
1096 | || (IPV4_ADDR_CMP(&nbr->address.u.prefix4, &hello->d_router) | |
1097 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &nbr->d_router))) | |
1098 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1099 | ||
1100 | /* had not previously. */ | |
1101 | if ((IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->bd_router) | |
1102 | && IPV4_ADDR_CMP(&nbr->address.u.prefix4, &nbr->bd_router)) | |
1103 | || (IPV4_ADDR_CMP(&nbr->address.u.prefix4, &hello->bd_router) | |
1104 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &nbr->bd_router))) | |
1105 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1106 | ||
1107 | /* Neighbor priority check. */ | |
1108 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
1109 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1110 | ||
1111 | /* Set neighbor information. */ | |
1112 | nbr->priority = hello->priority; | |
1113 | nbr->d_router = hello->d_router; | |
1114 | nbr->bd_router = hello->bd_router; | |
718e3744 | 1115 | } |
1116 | ||
1117 | /* Save DD flags/options/Seqnum received. */ | |
d62a17ae | 1118 | static void ospf_db_desc_save_current(struct ospf_neighbor *nbr, |
1119 | struct ospf_db_desc *dd) | |
718e3744 | 1120 | { |
d62a17ae | 1121 | nbr->last_recv.flags = dd->flags; |
1122 | nbr->last_recv.options = dd->options; | |
1123 | nbr->last_recv.dd_seqnum = ntohl(dd->dd_seqnum); | |
718e3744 | 1124 | } |
1125 | ||
1126 | /* Process rest of DD packet. */ | |
d62a17ae | 1127 | static void ospf_db_desc_proc(struct stream *s, struct ospf_interface *oi, |
1128 | struct ospf_neighbor *nbr, | |
d7c0a89a | 1129 | struct ospf_db_desc *dd, uint16_t size) |
d62a17ae | 1130 | { |
1131 | struct ospf_lsa *new, *find; | |
1132 | struct lsa_header *lsah; | |
1133 | ||
1134 | stream_forward_getp(s, OSPF_DB_DESC_MIN_SIZE); | |
1135 | for (size -= OSPF_DB_DESC_MIN_SIZE; size >= OSPF_LSA_HEADER_SIZE; | |
1136 | size -= OSPF_LSA_HEADER_SIZE) { | |
2d34fb80 | 1137 | lsah = (struct lsa_header *)stream_pnt(s); |
d62a17ae | 1138 | stream_forward_getp(s, OSPF_LSA_HEADER_SIZE); |
1139 | ||
1140 | /* Unknown LS type. */ | |
1141 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) { | |
cf444bcf | 1142 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1143 | "Packet [DD:RECV]: Unknown LS type %d.", |
d62a17ae | 1144 | lsah->type); |
1145 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1146 | return; | |
1147 | } | |
1148 | ||
1149 | if (IS_OPAQUE_LSA(lsah->type) | |
1150 | && !CHECK_FLAG(nbr->options, OSPF_OPTION_O)) { | |
cf444bcf | 1151 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1152 | "LSA[Type%d:%s]: Opaque capability mismatch?", |
d62a17ae | 1153 | lsah->type, inet_ntoa(lsah->id)); |
1154 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1155 | return; | |
1156 | } | |
1157 | ||
1158 | switch (lsah->type) { | |
1159 | case OSPF_AS_EXTERNAL_LSA: | |
1160 | case OSPF_OPAQUE_AS_LSA: | |
1161 | /* Check for stub area. Reject if AS-External from stub | |
1162 | but | |
1163 | allow if from NSSA. */ | |
1164 | if (oi->area->external_routing == OSPF_AREA_STUB) { | |
c9cc11f6 | 1165 | flog_warn( |
cf444bcf | 1166 | EC_OSPF_PACKET, |
d62a17ae | 1167 | "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", |
1168 | lsah->type, inet_ntoa(lsah->id), | |
1169 | (oi->area->external_routing | |
1170 | == OSPF_AREA_STUB) | |
1171 | ? "STUB" | |
1172 | : "NSSA"); | |
1173 | OSPF_NSM_EVENT_SCHEDULE(nbr, | |
1174 | NSM_SeqNumberMismatch); | |
1175 | return; | |
1176 | } | |
1177 | break; | |
1178 | default: | |
1179 | break; | |
1180 | } | |
1181 | ||
1182 | /* Create LS-request object. */ | |
1183 | new = ospf_ls_request_new(lsah); | |
1184 | ||
1185 | /* Lookup received LSA, then add LS request list. */ | |
1186 | find = ospf_lsa_lookup_by_header(oi->area, lsah); | |
1187 | ||
1188 | /* ospf_lsa_more_recent is fine with NULL pointers */ | |
1189 | switch (ospf_lsa_more_recent(find, new)) { | |
1190 | case -1: | |
1191 | /* Neighbour has a more recent LSA, we must request it | |
1192 | */ | |
1193 | ospf_ls_request_add(nbr, new); | |
1194 | /* fallthru */ | |
1195 | case 0: | |
1196 | /* If we have a copy of this LSA, it's either less | |
1197 | * recent | |
1198 | * and we're requesting it from neighbour (the case | |
1199 | * above), or | |
1200 | * it's as recent and we both have same copy (this | |
1201 | * case). | |
1202 | * | |
1203 | * In neither of these two cases is there any point in | |
1204 | * describing our copy of the LSA to the neighbour in a | |
1205 | * DB-Summary packet, if we're still intending to do so. | |
1206 | * | |
1207 | * See: draft-ogier-ospf-dbex-opt-00.txt, describing the | |
1208 | * backward compatible optimisation to OSPF DB Exchange | |
1209 | * / | |
1210 | * DB Description process implemented here. | |
1211 | */ | |
1212 | if (find) | |
1213 | ospf_lsdb_delete(&nbr->db_sum, find); | |
1214 | ospf_lsa_discard(new); | |
1215 | break; | |
1216 | default: | |
1217 | /* We have the more recent copy, nothing specific to do: | |
1218 | * - no need to request neighbours stale copy | |
1219 | * - must leave DB summary list copy alone | |
1220 | */ | |
1221 | if (IS_DEBUG_OSPF_EVENT) | |
1222 | zlog_debug( | |
1223 | "Packet [DD:RECV]: LSA received Type %d, " | |
1224 | "ID %s is not recent.", | |
1225 | lsah->type, inet_ntoa(lsah->id)); | |
1226 | ospf_lsa_discard(new); | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | /* Master */ | |
1231 | if (IS_SET_DD_MS(nbr->dd_flags)) { | |
1232 | nbr->dd_seqnum++; | |
1233 | ||
1234 | /* Both sides have no More, then we're done with Exchange */ | |
1235 | if (!IS_SET_DD_M(dd->flags) && !IS_SET_DD_M(nbr->dd_flags)) | |
1236 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_ExchangeDone); | |
1237 | else | |
1238 | ospf_db_desc_send(nbr); | |
1239 | } | |
1240 | /* Slave */ | |
1241 | else { | |
1242 | nbr->dd_seqnum = ntohl(dd->dd_seqnum); | |
1243 | ||
1244 | /* Send DD packet in reply. | |
1245 | * | |
1246 | * Must be done to acknowledge the Master's DD, regardless of | |
1247 | * whether we have more LSAs ourselves to describe. | |
1248 | * | |
1249 | * This function will clear the 'More' bit, if after this DD | |
1250 | * we have no more LSAs to describe to the master.. | |
1251 | */ | |
1252 | ospf_db_desc_send(nbr); | |
1253 | ||
1254 | /* Slave can raise ExchangeDone now, if master is also done */ | |
1255 | if (!IS_SET_DD_M(dd->flags) && !IS_SET_DD_M(nbr->dd_flags)) | |
1256 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_ExchangeDone); | |
1257 | } | |
1258 | ||
1259 | /* Save received neighbor values from DD. */ | |
1260 | ospf_db_desc_save_current(nbr, dd); | |
1261 | ||
1262 | if (!nbr->t_ls_req) | |
1263 | ospf_ls_req_send(nbr); | |
1264 | } | |
1265 | ||
1266 | static int ospf_db_desc_is_dup(struct ospf_db_desc *dd, | |
1267 | struct ospf_neighbor *nbr) | |
1268 | { | |
1269 | /* Is DD duplicated? */ | |
1270 | if (dd->options == nbr->last_recv.options | |
1271 | && dd->flags == nbr->last_recv.flags | |
1272 | && dd->dd_seqnum == htonl(nbr->last_recv.dd_seqnum)) | |
1273 | return 1; | |
1274 | ||
1275 | return 0; | |
718e3744 | 1276 | } |
1277 | ||
1278 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
d62a17ae | 1279 | static void ospf_db_desc(struct ip *iph, struct ospf_header *ospfh, |
1280 | struct stream *s, struct ospf_interface *oi, | |
d7c0a89a | 1281 | uint16_t size) |
d62a17ae | 1282 | { |
1283 | struct ospf_db_desc *dd; | |
1284 | struct ospf_neighbor *nbr; | |
d363df2c | 1285 | |
d62a17ae | 1286 | /* Increment statistics. */ |
1287 | oi->db_desc_in++; | |
718e3744 | 1288 | |
2d34fb80 | 1289 | dd = (struct ospf_db_desc *)stream_pnt(s); |
d62a17ae | 1290 | |
1291 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1292 | if (nbr == NULL) { | |
cf444bcf | 1293 | flog_warn(EC_OSPF_PACKET, "Packet[DD]: Unknown Neighbor %s", |
d62a17ae | 1294 | inet_ntoa(ospfh->router_id)); |
1295 | return; | |
718e3744 | 1296 | } |
d62a17ae | 1297 | |
1298 | /* Check MTU. */ | |
1299 | if ((OSPF_IF_PARAM(oi, mtu_ignore) == 0) | |
1300 | && (ntohs(dd->mtu) > oi->ifp->mtu)) { | |
c9cc11f6 | 1301 | flog_warn( |
cf444bcf | 1302 | EC_OSPF_PACKET, |
d62a17ae | 1303 | "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", |
1304 | inet_ntoa(nbr->router_id), ntohs(dd->mtu), IF_NAME(oi), | |
1305 | oi->ifp->mtu); | |
1306 | return; | |
718e3744 | 1307 | } |
1308 | ||
d62a17ae | 1309 | /* |
1310 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is | |
1311 | * not | |
1312 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1313 | * Until proper solution is developped, this hack should help. | |
1314 | * | |
1315 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1316 | * options, unfortunately its use in DD options is not specified. Hence | |
1317 | * some | |
1318 | * implementations follow E-bit semantics and set it in DD options, and | |
1319 | * some | |
1320 | * treat it as unspecified and hence follow the directive "default for | |
1321 | * options is clear", ie unset. | |
1322 | * | |
1323 | * Reset the flag, as ospfd follows E-bit semantics. | |
1324 | */ | |
1325 | if ((oi->area->external_routing == OSPF_AREA_NSSA) | |
1326 | && (CHECK_FLAG(nbr->options, OSPF_OPTION_NP)) | |
1327 | && (!CHECK_FLAG(dd->options, OSPF_OPTION_NP))) { | |
1328 | if (IS_DEBUG_OSPF_EVENT) | |
1329 | zlog_debug( | |
1330 | "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", | |
1331 | inet_ntoa(nbr->router_id)); | |
1332 | SET_FLAG(dd->options, OSPF_OPTION_NP); | |
718e3744 | 1333 | } |
1334 | ||
d62a17ae | 1335 | #ifdef REJECT_IF_TBIT_ON |
1336 | if (CHECK_FLAG(dd->options, OSPF_OPTION_MT)) { | |
1337 | /* | |
1338 | * In Hello protocol, optional capability must have checked | |
1339 | * to prevent this T-bit enabled router be my neighbor. | |
1340 | */ | |
1c50c1c0 | 1341 | flog_warn(EC_OSPF_PACKET, "Packet[DD]: Neighbor %s: T-bit on?", |
d62a17ae | 1342 | inet_ntoa(nbr->router_id)); |
1343 | return; | |
1344 | } | |
1345 | #endif /* REJECT_IF_TBIT_ON */ | |
1346 | ||
1347 | if (CHECK_FLAG(dd->options, OSPF_OPTION_O) | |
1348 | && !CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) { | |
1349 | /* | |
1350 | * This node is not configured to handle O-bit, for now. | |
1351 | * Clear it to ignore unsupported capability proposed by | |
1352 | * neighbor. | |
1353 | */ | |
1354 | UNSET_FLAG(dd->options, OSPF_OPTION_O); | |
1355 | } | |
1356 | ||
1357 | /* Add event to thread. */ | |
1358 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1359 | ||
e6a22aeb SK |
1360 | if (CHECK_FLAG(oi->ospf->config, OSPF_LOG_ADJACENCY_DETAIL)) |
1361 | zlog_info( | |
1362 | "%s:Packet[DD]: Neighbor %s state is %s, seq_num:0x%x, local:0x%x", | |
1363 | (oi->ospf->name) ? oi->ospf->name : VRF_DEFAULT_NAME, | |
1364 | inet_ntoa(nbr->router_id), | |
1365 | lookup_msg(ospf_nsm_state_msg, nbr->state, NULL), | |
1366 | ntohl(dd->dd_seqnum), nbr->dd_seqnum); | |
1367 | ||
d62a17ae | 1368 | /* Process DD packet by neighbor status. */ |
1369 | switch (nbr->state) { | |
1370 | case NSM_Down: | |
1371 | case NSM_Attempt: | |
1372 | case NSM_TwoWay: | |
96db9cd3 DS |
1373 | if (CHECK_FLAG(oi->ospf->config, OSPF_LOG_ADJACENCY_DETAIL)) |
1374 | zlog_info( | |
1375 | "Packet[DD]: Neighbor %s state is %s, packet discarded.", | |
1376 | inet_ntoa(nbr->router_id), | |
1377 | lookup_msg(ospf_nsm_state_msg, nbr->state, | |
1378 | NULL)); | |
d62a17ae | 1379 | break; |
1380 | case NSM_Init: | |
1381 | OSPF_NSM_EVENT_EXECUTE(nbr, NSM_TwoWayReceived); | |
1382 | /* If the new state is ExStart, the processing of the current | |
1383 | packet should then continue in this new state by falling | |
1384 | through to case ExStart below. */ | |
1385 | if (nbr->state != NSM_ExStart) | |
1386 | break; | |
1387 | /* fallthru */ | |
1388 | case NSM_ExStart: | |
1389 | /* Initial DBD */ | |
1390 | if ((IS_SET_DD_ALL(dd->flags) == OSPF_DD_FLAG_ALL) | |
1391 | && (size == OSPF_DB_DESC_MIN_SIZE)) { | |
1392 | if (IPV4_ADDR_CMP(&nbr->router_id, &oi->ospf->router_id) | |
1393 | > 0) { | |
1394 | /* We're Slave---obey */ | |
05ba78e4 CS |
1395 | if (CHECK_FLAG(oi->ospf->config, |
1396 | OSPF_LOG_ADJACENCY_DETAIL)) | |
996c9314 LB |
1397 | zlog_info( |
1398 | "Packet[DD]: Neighbor %s Negotiation done (Slave).", | |
1399 | inet_ntoa(nbr->router_id)); | |
05ba78e4 | 1400 | |
d62a17ae | 1401 | nbr->dd_seqnum = ntohl(dd->dd_seqnum); |
1402 | ||
1403 | /* Reset I/MS */ | |
1404 | UNSET_FLAG(nbr->dd_flags, | |
1405 | (OSPF_DD_FLAG_MS | OSPF_DD_FLAG_I)); | |
1406 | } else { | |
1407 | /* We're Master, ignore the initial DBD from | |
1408 | * Slave */ | |
05ba78e4 CS |
1409 | if (CHECK_FLAG(oi->ospf->config, |
1410 | OSPF_LOG_ADJACENCY_DETAIL)) | |
1411 | zlog_info( | |
1412 | "Packet[DD]: Neighbor %s: Initial DBD from Slave, " | |
1413 | "ignoring.", | |
1414 | inet_ntoa(nbr->router_id)); | |
d62a17ae | 1415 | break; |
1416 | } | |
1417 | } | |
1418 | /* Ack from the Slave */ | |
1419 | else if (!IS_SET_DD_MS(dd->flags) && !IS_SET_DD_I(dd->flags) | |
1420 | && ntohl(dd->dd_seqnum) == nbr->dd_seqnum | |
1421 | && IPV4_ADDR_CMP(&nbr->router_id, &oi->ospf->router_id) | |
1422 | < 0) { | |
1423 | zlog_info( | |
1424 | "Packet[DD]: Neighbor %s Negotiation done (Master).", | |
1425 | inet_ntoa(nbr->router_id)); | |
1426 | /* Reset I, leaving MS */ | |
1427 | UNSET_FLAG(nbr->dd_flags, OSPF_DD_FLAG_I); | |
1428 | } else { | |
cf444bcf | 1429 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1430 | "Packet[DD]: Neighbor %s Negotiation fails.", |
d62a17ae | 1431 | inet_ntoa(nbr->router_id)); |
1432 | break; | |
1433 | } | |
1434 | ||
1435 | /* This is where the real Options are saved */ | |
1436 | nbr->options = dd->options; | |
1437 | ||
1438 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) { | |
1439 | if (IS_DEBUG_OSPF_EVENT) | |
1440 | zlog_debug( | |
1441 | "Neighbor[%s] is %sOpaque-capable.", | |
1442 | inet_ntoa(nbr->router_id), | |
1443 | CHECK_FLAG(nbr->options, OSPF_OPTION_O) | |
1444 | ? "" | |
1445 | : "NOT "); | |
1446 | ||
1447 | if (!CHECK_FLAG(nbr->options, OSPF_OPTION_O) | |
1448 | && IPV4_ADDR_SAME(&DR(oi), | |
1449 | &nbr->address.u.prefix4)) { | |
c9cc11f6 | 1450 | flog_warn( |
cf444bcf | 1451 | EC_OSPF_PACKET, |
c9cc11f6 | 1452 | "DR-neighbor[%s] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.", |
d62a17ae | 1453 | inet_ntoa(nbr->router_id)); |
1454 | /* This situation is undesirable, but not a real | |
1455 | * error. */ | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | OSPF_NSM_EVENT_EXECUTE(nbr, NSM_NegotiationDone); | |
1460 | ||
1461 | /* continue processing rest of packet. */ | |
1462 | ospf_db_desc_proc(s, oi, nbr, dd, size); | |
1463 | break; | |
1464 | case NSM_Exchange: | |
1465 | if (ospf_db_desc_is_dup(dd, nbr)) { | |
1466 | if (IS_SET_DD_MS(nbr->dd_flags)) | |
1467 | /* Master: discard duplicated DD packet. */ | |
1468 | zlog_info( | |
1469 | "Packet[DD] (Master): Neighbor %s packet duplicated.", | |
1470 | inet_ntoa(nbr->router_id)); | |
1471 | else | |
1472 | /* Slave: cause to retransmit the last Database | |
1473 | Description. */ | |
1474 | { | |
1475 | zlog_info( | |
1476 | "Packet[DD] [Slave]: Neighbor %s packet duplicated.", | |
1477 | inet_ntoa(nbr->router_id)); | |
1478 | ospf_db_desc_resend(nbr); | |
1479 | } | |
1480 | break; | |
1481 | } | |
1482 | ||
1483 | /* Otherwise DD packet should be checked. */ | |
1484 | /* Check Master/Slave bit mismatch */ | |
1485 | if (IS_SET_DD_MS(dd->flags) | |
1486 | != IS_SET_DD_MS(nbr->last_recv.flags)) { | |
cf444bcf | 1487 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1488 | "Packet[DD]: Neighbor %s MS-bit mismatch.", |
d62a17ae | 1489 | inet_ntoa(nbr->router_id)); |
1490 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1491 | if (IS_DEBUG_OSPF_EVENT) | |
1492 | zlog_debug( | |
1493 | "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", | |
1494 | dd->flags, nbr->dd_flags); | |
1495 | break; | |
1496 | } | |
1497 | ||
1498 | /* Check initialize bit is set. */ | |
1499 | if (IS_SET_DD_I(dd->flags)) { | |
1500 | zlog_info("Packet[DD]: Neighbor %s I-bit set.", | |
1501 | inet_ntoa(nbr->router_id)); | |
1502 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1503 | break; | |
1504 | } | |
1505 | ||
1506 | /* Check DD Options. */ | |
1507 | if (dd->options != nbr->options) { | |
cf444bcf | 1508 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1509 | "Packet[DD]: Neighbor %s options mismatch.", |
d62a17ae | 1510 | inet_ntoa(nbr->router_id)); |
1511 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1512 | break; | |
1513 | } | |
718e3744 | 1514 | |
d62a17ae | 1515 | /* Check DD sequence number. */ |
1516 | if ((IS_SET_DD_MS(nbr->dd_flags) | |
1517 | && ntohl(dd->dd_seqnum) != nbr->dd_seqnum) | |
1518 | || (!IS_SET_DD_MS(nbr->dd_flags) | |
1519 | && ntohl(dd->dd_seqnum) != nbr->dd_seqnum + 1)) { | |
c9cc11f6 | 1520 | flog_warn( |
cf444bcf | 1521 | EC_OSPF_PACKET, |
d62a17ae | 1522 | "Packet[DD]: Neighbor %s sequence number mismatch.", |
1523 | inet_ntoa(nbr->router_id)); | |
1524 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1525 | break; | |
1526 | } | |
1527 | ||
1528 | /* Continue processing rest of packet. */ | |
1529 | ospf_db_desc_proc(s, oi, nbr, dd, size); | |
1530 | break; | |
1531 | case NSM_Loading: | |
1532 | case NSM_Full: | |
1533 | if (ospf_db_desc_is_dup(dd, nbr)) { | |
1534 | if (IS_SET_DD_MS(nbr->dd_flags)) { | |
1535 | /* Master should discard duplicate DD packet. */ | |
1536 | zlog_info( | |
1537 | "Packet[DD]: Neighbor %s duplicated, " | |
1538 | "packet discarded.", | |
1539 | inet_ntoa(nbr->router_id)); | |
1540 | break; | |
1541 | } else { | |
1542 | if (monotime_since(&nbr->last_send_ts, NULL) | |
1543 | < nbr->v_inactivity * 1000000LL) { | |
1544 | /* In states Loading and Full the slave | |
1545 | must resend | |
1546 | its last Database Description packet | |
1547 | in response to | |
1548 | duplicate Database Description | |
1549 | packets received | |
1550 | from the master. For this reason the | |
1551 | slave must | |
1552 | wait RouterDeadInterval seconds | |
1553 | before freeing the | |
1554 | last Database Description packet. | |
1555 | Reception of a | |
1556 | Database Description packet from the | |
1557 | master after | |
1558 | this interval will generate a | |
1559 | SeqNumberMismatch | |
1560 | neighbor event. RFC2328 Section 10.8 | |
1561 | */ | |
1562 | ospf_db_desc_resend(nbr); | |
1563 | break; | |
1564 | } | |
1565 | } | |
718e3744 | 1566 | } |
718e3744 | 1567 | |
d62a17ae | 1568 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); |
1569 | break; | |
1570 | default: | |
cf444bcf | 1571 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1572 | "Packet[DD]: Neighbor %s NSM illegal status %u.", |
d62a17ae | 1573 | inet_ntoa(nbr->router_id), nbr->state); |
1574 | break; | |
1575 | } | |
718e3744 | 1576 | } |
1577 | ||
1578 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1579 | ||
1580 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
d62a17ae | 1581 | static void ospf_ls_req(struct ip *iph, struct ospf_header *ospfh, |
1582 | struct stream *s, struct ospf_interface *oi, | |
d7c0a89a | 1583 | uint16_t size) |
d62a17ae | 1584 | { |
1585 | struct ospf_neighbor *nbr; | |
d7c0a89a | 1586 | uint32_t ls_type; |
d62a17ae | 1587 | struct in_addr ls_id; |
1588 | struct in_addr adv_router; | |
1589 | struct ospf_lsa *find; | |
1590 | struct list *ls_upd; | |
1591 | unsigned int length; | |
1592 | ||
1593 | /* Increment statistics. */ | |
1594 | oi->ls_req_in++; | |
1595 | ||
1596 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1597 | if (nbr == NULL) { | |
cf444bcf | 1598 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1599 | "Link State Request: Unknown Neighbor %s.", |
d62a17ae | 1600 | inet_ntoa(ospfh->router_id)); |
1601 | return; | |
718e3744 | 1602 | } |
1603 | ||
d62a17ae | 1604 | /* Add event to thread. */ |
1605 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1606 | ||
1607 | /* Neighbor State should be Exchange or later. */ | |
1608 | if (nbr->state != NSM_Exchange && nbr->state != NSM_Loading | |
1609 | && nbr->state != NSM_Full) { | |
c9cc11f6 | 1610 | flog_warn( |
cf444bcf | 1611 | EC_OSPF_PACKET, |
c9cc11f6 | 1612 | "Link State Request received from %s: Neighbor state is %s, packet discarded.", |
d62a17ae | 1613 | inet_ntoa(ospfh->router_id), |
1614 | lookup_msg(ospf_nsm_state_msg, nbr->state, NULL)); | |
1615 | return; | |
718e3744 | 1616 | } |
1617 | ||
d62a17ae | 1618 | /* Send Link State Update for ALL requested LSAs. */ |
1619 | ls_upd = list_new(); | |
1620 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1621 | ||
1622 | while (size >= OSPF_LSA_KEY_SIZE) { | |
1623 | /* Get one slice of Link State Request. */ | |
1624 | ls_type = stream_getl(s); | |
1625 | ls_id.s_addr = stream_get_ipv4(s); | |
1626 | adv_router.s_addr = stream_get_ipv4(s); | |
1627 | ||
1628 | /* Verify LSA type. */ | |
1629 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) { | |
1630 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
6a154c88 | 1631 | list_delete(&ls_upd); |
d62a17ae | 1632 | return; |
1633 | } | |
718e3744 | 1634 | |
d62a17ae | 1635 | /* Search proper LSA in LSDB. */ |
b5a8894d CS |
1636 | find = ospf_lsa_lookup(oi->ospf, oi->area, ls_type, ls_id, |
1637 | adv_router); | |
d62a17ae | 1638 | if (find == NULL) { |
1639 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
6a154c88 | 1640 | list_delete(&ls_upd); |
d62a17ae | 1641 | return; |
1642 | } | |
718e3744 | 1643 | |
d62a17ae | 1644 | /* Packet overflows MTU size, send immediately. */ |
1645 | if (length + ntohs(find->data->length) > ospf_packet_max(oi)) { | |
1646 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1647 | ospf_ls_upd_send(nbr, ls_upd, | |
046460a1 | 1648 | OSPF_SEND_PACKET_DIRECT, 0); |
d62a17ae | 1649 | else |
1650 | ospf_ls_upd_send(nbr, ls_upd, | |
046460a1 | 1651 | OSPF_SEND_PACKET_INDIRECT, 0); |
d62a17ae | 1652 | |
1653 | /* Only remove list contents. Keep ls_upd. */ | |
1654 | list_delete_all_node(ls_upd); | |
718e3744 | 1655 | |
d62a17ae | 1656 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; |
1657 | } | |
1658 | ||
1659 | /* Append LSA to update list. */ | |
1660 | listnode_add(ls_upd, find); | |
1661 | length += ntohs(find->data->length); | |
718e3744 | 1662 | |
d62a17ae | 1663 | size -= OSPF_LSA_KEY_SIZE; |
1664 | } | |
718e3744 | 1665 | |
d62a17ae | 1666 | /* Send rest of Link State Update. */ |
1667 | if (listcount(ls_upd) > 0) { | |
1668 | if (oi->type == OSPF_IFTYPE_NBMA) | |
996c9314 LB |
1669 | ospf_ls_upd_send(nbr, ls_upd, OSPF_SEND_PACKET_DIRECT, |
1670 | 0); | |
d62a17ae | 1671 | else |
996c9314 LB |
1672 | ospf_ls_upd_send(nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT, |
1673 | 0); | |
718e3744 | 1674 | |
6a154c88 | 1675 | list_delete(&ls_upd); |
d62a17ae | 1676 | } else |
6a154c88 | 1677 | list_delete(&ls_upd); |
718e3744 | 1678 | } |
1679 | ||
1680 | /* Get the list of LSAs from Link State Update packet. | |
1681 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
d62a17ae | 1682 | static struct list *ospf_ls_upd_list_lsa(struct ospf_neighbor *nbr, |
1683 | struct stream *s, | |
1684 | struct ospf_interface *oi, size_t size) | |
1685 | { | |
d7c0a89a QY |
1686 | uint16_t count, sum; |
1687 | uint32_t length; | |
d62a17ae | 1688 | struct lsa_header *lsah; |
1689 | struct ospf_lsa *lsa; | |
1690 | struct list *lsas; | |
1691 | ||
1692 | lsas = list_new(); | |
1693 | ||
1694 | count = stream_getl(s); | |
1695 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1696 | ||
1697 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
1698 | size -= length, stream_forward_getp(s, length), count--) { | |
2d34fb80 | 1699 | lsah = (struct lsa_header *)stream_pnt(s); |
d62a17ae | 1700 | length = ntohs(lsah->length); |
1701 | ||
1702 | if (length > size) { | |
c9cc11f6 | 1703 | flog_warn( |
cf444bcf | 1704 | EC_OSPF_PACKET, |
d62a17ae | 1705 | "Link State Update: LSA length exceeds packet size."); |
1706 | break; | |
1707 | } | |
718e3744 | 1708 | |
d62a17ae | 1709 | /* Validate the LSA's LS checksum. */ |
1710 | sum = lsah->checksum; | |
1711 | if (!ospf_lsa_checksum_valid(lsah)) { | |
1712 | /* (bug #685) more details in a one-line message make it | |
1713 | * possible | |
1714 | * to identify problem source on the one hand and to | |
1715 | * have a better | |
1716 | * chance to compress repeated messages in syslog on the | |
1717 | * other */ | |
c9cc11f6 | 1718 | flog_warn( |
cf444bcf | 1719 | EC_OSPF_PACKET, |
d62a17ae | 1720 | "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s", |
1721 | sum, lsah->checksum, inet_ntoa(lsah->id), | |
1722 | inet_ntoa(nbr->src), inet_ntoa(nbr->router_id), | |
1723 | inet_ntoa(lsah->adv_router)); | |
1724 | continue; | |
1725 | } | |
718e3744 | 1726 | |
d62a17ae | 1727 | /* Examine the LSA's LS type. */ |
1728 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) { | |
cf444bcf | 1729 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1730 | "Link State Update: Unknown LS type %d", |
d62a17ae | 1731 | lsah->type); |
1732 | continue; | |
1733 | } | |
718e3744 | 1734 | |
d62a17ae | 1735 | /* |
1736 | * What if the received LSA's age is greater than MaxAge? | |
1737 | * Treat it as a MaxAge case -- endo. | |
1738 | */ | |
1739 | if (ntohs(lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1740 | lsah->ls_age = htons(OSPF_LSA_MAXAGE); | |
718e3744 | 1741 | |
d62a17ae | 1742 | if (CHECK_FLAG(nbr->options, OSPF_OPTION_O)) { |
1743 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1744 | if ((IS_OPAQUE_LSA(lsah->type) | |
1745 | && !CHECK_FLAG(lsah->options, OSPF_OPTION_O)) | |
1746 | || (!IS_OPAQUE_LSA(lsah->type) | |
1747 | && CHECK_FLAG(lsah->options, OSPF_OPTION_O))) { | |
1748 | /* | |
1749 | * This neighbor must know the exact usage of | |
1750 | * O-bit; | |
1751 | * the bit will be set in Type-9,10,11 LSAs | |
1752 | * only. | |
1753 | */ | |
cf444bcf | 1754 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1755 | "LSA[Type%d:%s]: O-bit abuse?", |
d62a17ae | 1756 | lsah->type, inet_ntoa(lsah->id)); |
1757 | continue; | |
1758 | } | |
1759 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
718e3744 | 1760 | |
d62a17ae | 1761 | /* Do not take in AS External Opaque-LSAs if we are a |
1762 | * stub. */ | |
1763 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1764 | && nbr->oi->area->external_routing | |
1765 | != OSPF_AREA_DEFAULT) { | |
1766 | if (IS_DEBUG_OSPF_EVENT) | |
1767 | zlog_debug( | |
1768 | "LSA[Type%d:%s]: We are a stub, don't take this LSA.", | |
1769 | lsah->type, | |
1770 | inet_ntoa(lsah->id)); | |
1771 | continue; | |
1772 | } | |
1773 | } else if (IS_OPAQUE_LSA(lsah->type)) { | |
cf444bcf | 1774 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1775 | "LSA[Type%d:%s]: Opaque capability mismatch?", |
d62a17ae | 1776 | lsah->type, inet_ntoa(lsah->id)); |
1777 | continue; | |
1778 | } | |
718e3744 | 1779 | |
d62a17ae | 1780 | /* Create OSPF LSA instance. */ |
5b3d4186 | 1781 | lsa = ospf_lsa_new_and_data(length); |
d62a17ae | 1782 | |
b5a8894d | 1783 | lsa->vrf_id = oi->ospf->vrf_id; |
d62a17ae | 1784 | /* We may wish to put some error checking if type NSSA comes in |
1785 | and area not in NSSA mode */ | |
1786 | switch (lsah->type) { | |
1787 | case OSPF_AS_EXTERNAL_LSA: | |
1788 | case OSPF_OPAQUE_AS_LSA: | |
1789 | lsa->area = NULL; | |
1790 | break; | |
1791 | case OSPF_OPAQUE_LINK_LSA: | |
1792 | lsa->oi = oi; /* Remember incoming interface for | |
1793 | flooding control. */ | |
1794 | /* Fallthrough */ | |
1795 | default: | |
1796 | lsa->area = oi->area; | |
1797 | break; | |
1798 | } | |
718e3744 | 1799 | |
d62a17ae | 1800 | memcpy(lsa->data, lsah, length); |
1801 | ||
1802 | if (IS_DEBUG_OSPF_EVENT) | |
1803 | zlog_debug( | |
1804 | "LSA[Type%d:%s]: %p new LSA created with Link State Update", | |
1805 | lsa->data->type, inet_ntoa(lsa->data->id), | |
1806 | (void *)lsa); | |
1807 | listnode_add(lsas, lsa); | |
1808 | } | |
718e3744 | 1809 | |
d62a17ae | 1810 | return lsas; |
718e3744 | 1811 | } |
1812 | ||
1813 | /* Cleanup Update list. */ | |
d62a17ae | 1814 | static void ospf_upd_list_clean(struct list *lsas) |
718e3744 | 1815 | { |
d62a17ae | 1816 | struct listnode *node, *nnode; |
1817 | struct ospf_lsa *lsa; | |
718e3744 | 1818 | |
d62a17ae | 1819 | for (ALL_LIST_ELEMENTS(lsas, node, nnode, lsa)) |
1820 | ospf_lsa_discard(lsa); | |
718e3744 | 1821 | |
6a154c88 | 1822 | list_delete(&lsas); |
718e3744 | 1823 | } |
1824 | ||
1825 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
d62a17ae | 1826 | static void ospf_ls_upd(struct ospf *ospf, struct ip *iph, |
1827 | struct ospf_header *ospfh, struct stream *s, | |
d7c0a89a | 1828 | struct ospf_interface *oi, uint16_t size) |
d62a17ae | 1829 | { |
1830 | struct ospf_neighbor *nbr; | |
1831 | struct list *lsas; | |
1832 | struct listnode *node, *nnode; | |
1833 | struct ospf_lsa *lsa = NULL; | |
1834 | /* unsigned long ls_req_found = 0; */ | |
1835 | ||
1836 | /* Dis-assemble the stream, update each entry, re-encapsulate for | |
1837 | * flooding */ | |
1838 | ||
1839 | /* Increment statistics. */ | |
1840 | oi->ls_upd_in++; | |
1841 | ||
1842 | /* Check neighbor. */ | |
1843 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1844 | if (nbr == NULL) { | |
cf444bcf | 1845 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 1846 | "Link State Update: Unknown Neighbor %s on int: %s", |
d62a17ae | 1847 | inet_ntoa(ospfh->router_id), IF_NAME(oi)); |
1848 | return; | |
718e3744 | 1849 | } |
1850 | ||
d62a17ae | 1851 | /* Add event to thread. */ |
1852 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1853 | ||
1854 | /* Check neighbor state. */ | |
1855 | if (nbr->state < NSM_Exchange) { | |
1856 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
1857 | zlog_debug( | |
1858 | "Link State Update: " | |
1859 | "Neighbor[%s] state %s is less than Exchange", | |
1860 | inet_ntoa(ospfh->router_id), | |
1861 | lookup_msg(ospf_nsm_state_msg, nbr->state, | |
1862 | NULL)); | |
1863 | return; | |
1864 | } | |
718e3744 | 1865 | |
d62a17ae | 1866 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages |
1867 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1868 | * of section 13. | |
1869 | */ | |
1870 | lsas = ospf_ls_upd_list_lsa(nbr, s, oi, size); | |
1871 | ||
35955c14 CS |
1872 | if (lsas == NULL) |
1873 | return; | |
d62a17ae | 1874 | #define DISCARD_LSA(L, N) \ |
1875 | { \ | |
1876 | if (IS_DEBUG_OSPF_EVENT) \ | |
1877 | zlog_debug( \ | |
1878 | "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \ | |
1879 | " Type-%d", \ | |
1880 | N, (void *)lsa, (int)lsa->data->type); \ | |
1881 | ospf_lsa_discard(L); \ | |
1882 | continue; \ | |
718e3744 | 1883 | } |
1884 | ||
d62a17ae | 1885 | /* Process each LSA received in the one packet. |
1886 | * | |
1887 | * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding | |
1888 | * text below are from the steps in RFC 2328, Section 13. | |
1889 | */ | |
1890 | for (ALL_LIST_ELEMENTS(lsas, node, nnode, lsa)) { | |
1891 | struct ospf_lsa *ls_ret, *current; | |
1892 | int ret = 1; | |
1893 | ||
1894 | if (IS_DEBUG_OSPF_NSSA) { | |
1895 | char buf1[INET_ADDRSTRLEN]; | |
1896 | char buf2[INET_ADDRSTRLEN]; | |
1897 | char buf3[INET_ADDRSTRLEN]; | |
1898 | ||
1899 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", | |
1900 | lsa->data->type, | |
1901 | inet_ntop(AF_INET, &ospfh->router_id, buf1, | |
1902 | INET_ADDRSTRLEN), | |
1903 | inet_ntop(AF_INET, &lsa->data->id, buf2, | |
1904 | INET_ADDRSTRLEN), | |
1905 | inet_ntop(AF_INET, &lsa->data->adv_router, | |
1906 | buf3, INET_ADDRSTRLEN)); | |
1907 | } | |
718e3744 | 1908 | |
d62a17ae | 1909 | listnode_delete(lsas, |
1910 | lsa); /* We don't need it in list anymore */ | |
1911 | ||
1912 | /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa() | |
1913 | */ | |
1914 | ||
1915 | /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */ | |
1916 | ||
1917 | /* (3) Do not take in AS External LSAs if we are a stub or NSSA. | |
1918 | */ | |
1919 | ||
1920 | /* Do not take in AS NSSA if this neighbor and we are not NSSA | |
1921 | */ | |
1922 | ||
1923 | /* Do take in Type-7's if we are an NSSA */ | |
1924 | ||
1925 | /* If we are also an ABR, later translate them to a Type-5 | |
1926 | * packet */ | |
1927 | ||
1928 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1929 | translate them to a separate Type-5 packet. */ | |
1930 | ||
1931 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1932 | /* Reject from STUB or NSSA */ | |
1933 | if (nbr->oi->area->external_routing | |
1934 | != OSPF_AREA_DEFAULT) { | |
1935 | if (IS_DEBUG_OSPF_NSSA) | |
1936 | zlog_debug( | |
1937 | "Incoming External LSA Discarded: We are NSSA/STUB Area"); | |
1938 | DISCARD_LSA(lsa, 1); | |
1939 | } | |
1940 | ||
1941 | if (lsa->data->type == OSPF_AS_NSSA_LSA) | |
1942 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) { | |
1943 | if (IS_DEBUG_OSPF_NSSA) | |
1944 | zlog_debug( | |
1945 | "Incoming NSSA LSA Discarded: Not NSSA Area"); | |
1946 | DISCARD_LSA(lsa, 2); | |
1947 | } | |
1948 | ||
1949 | /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */ | |
1950 | if (lsa->data->type == OSPF_ROUTER_LSA) | |
1951 | if (!IPV4_ADDR_SAME(&lsa->data->id, | |
1952 | &lsa->data->adv_router)) { | |
1953 | char buf1[INET_ADDRSTRLEN]; | |
1954 | char buf2[INET_ADDRSTRLEN]; | |
1955 | char buf3[INET_ADDRSTRLEN]; | |
1956 | ||
cf444bcf | 1957 | flog_err(EC_OSPF_ROUTER_LSA_MISMATCH, |
1c50c1c0 QY |
1958 | "Incoming Router-LSA from %s with " |
1959 | "Adv-ID[%s] != LS-ID[%s]", | |
1960 | inet_ntop(AF_INET, &ospfh->router_id, | |
1961 | buf1, INET_ADDRSTRLEN), | |
1962 | inet_ntop(AF_INET, &lsa->data->id, | |
1963 | buf2, INET_ADDRSTRLEN), | |
1964 | inet_ntop(AF_INET, | |
1965 | &lsa->data->adv_router, buf3, | |
1966 | INET_ADDRSTRLEN)); | |
af4c2728 | 1967 | flog_err( |
cf444bcf | 1968 | EC_OSPF_DOMAIN_CORRUPT, |
d62a17ae | 1969 | "OSPF domain compromised by attack or corruption. " |
1970 | "Verify correct operation of -ALL- OSPF routers."); | |
1971 | DISCARD_LSA(lsa, 0); | |
1972 | } | |
1973 | ||
1974 | /* Find the LSA in the current database. */ | |
1975 | ||
1976 | current = ospf_lsa_lookup_by_header(oi->area, lsa->data); | |
1977 | ||
1978 | /* (4) If the LSA's LS age is equal to MaxAge, and there is | |
1979 | currently | |
1980 | no instance of the LSA in the router's link state database, | |
1981 | and none of router's neighbors are in states Exchange or | |
1982 | Loading, | |
1983 | then take the following actions: */ | |
1984 | ||
1985 | if (IS_LSA_MAXAGE(lsa) && !current | |
1986 | && ospf_check_nbr_status(oi->ospf)) { | |
1987 | /* (4a) Response Link State Acknowledgment. */ | |
1988 | ospf_ls_ack_send(nbr, lsa); | |
1989 | ||
1990 | /* (4b) Discard LSA. */ | |
1991 | if (IS_DEBUG_OSPF(lsa, LSA)) { | |
1992 | zlog_debug( | |
1993 | "Link State Update[%s]: LS age is equal to MaxAge.", | |
1994 | dump_lsa_key(lsa)); | |
1995 | } | |
1996 | DISCARD_LSA(lsa, 3); | |
1997 | } | |
1998 | ||
1999 | if (IS_OPAQUE_LSA(lsa->data->type) | |
2000 | && IPV4_ADDR_SAME(&lsa->data->adv_router, | |
2001 | &oi->ospf->router_id)) { | |
2002 | /* | |
2003 | * Even if initial flushing seems to be completed, there | |
2004 | * might | |
2005 | * be a case that self-originated LSA with MaxAge still | |
2006 | * remain | |
2007 | * in the routing domain. | |
2008 | * Just send an LSAck message to cease retransmission. | |
2009 | */ | |
2010 | if (IS_LSA_MAXAGE(lsa)) { | |
c9cc11f6 | 2011 | zlog_info("LSA[%s]: Boomerang effect?", |
d62a17ae | 2012 | dump_lsa_key(lsa)); |
2013 | ospf_ls_ack_send(nbr, lsa); | |
2014 | ospf_lsa_discard(lsa); | |
2015 | ||
2016 | if (current != NULL && !IS_LSA_MAXAGE(current)) | |
2017 | ospf_opaque_lsa_refresh_schedule( | |
2018 | current); | |
2019 | continue; | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * If an instance of self-originated Opaque-LSA is not | |
2024 | * found | |
2025 | * in the LSDB, there are some possible cases here. | |
2026 | * | |
2027 | * 1) This node lost opaque-capability after restart. | |
2028 | * 2) Else, a part of opaque-type is no more supported. | |
2029 | * 3) Else, a part of opaque-id is no more supported. | |
2030 | * | |
2031 | * Anyway, it is still this node's responsibility to | |
2032 | * flush it. | |
2033 | * Otherwise, the LSA instance remains in the routing | |
2034 | * domain | |
2035 | * until its age reaches to MaxAge. | |
2036 | */ | |
2037 | /* XXX: We should deal with this for *ALL* LSAs, not | |
2038 | * just opaque */ | |
2039 | if (current == NULL) { | |
2040 | if (IS_DEBUG_OSPF_EVENT) | |
2041 | zlog_debug( | |
2042 | "LSA[%s]: Previously originated Opaque-LSA," | |
2043 | "not found in the LSDB.", | |
2044 | dump_lsa_key(lsa)); | |
2045 | ||
2046 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
2047 | ||
2048 | ospf_opaque_self_originated_lsa_received(nbr, | |
2049 | lsa); | |
2050 | ospf_ls_ack_send(nbr, lsa); | |
2051 | ||
2052 | continue; | |
2053 | } | |
2054 | } | |
2055 | ||
2056 | /* It might be happen that received LSA is self-originated | |
2057 | * network LSA, but | |
2058 | * router ID is changed. So, we should check if LSA is a | |
2059 | * network-LSA whose | |
2060 | * Link State ID is one of the router's own IP interface | |
2061 | * addresses but whose | |
2062 | * Advertising Router is not equal to the router's own Router ID | |
2063 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be | |
2064 | * flushed. | |
2065 | */ | |
2066 | ||
2067 | if (lsa->data->type == OSPF_NETWORK_LSA) { | |
2068 | struct listnode *oinode, *oinnode; | |
2069 | struct ospf_interface *out_if; | |
2070 | int Flag = 0; | |
2071 | ||
2072 | for (ALL_LIST_ELEMENTS(oi->ospf->oiflist, oinode, | |
2073 | oinnode, out_if)) { | |
2074 | if (out_if == NULL) | |
2075 | break; | |
2076 | ||
2077 | if ((IPV4_ADDR_SAME(&out_if->address->u.prefix4, | |
2078 | &lsa->data->id)) | |
2079 | && (!(IPV4_ADDR_SAME( | |
2080 | &oi->ospf->router_id, | |
2081 | &lsa->data->adv_router)))) { | |
2082 | if (out_if->network_lsa_self) { | |
2083 | ospf_lsa_flush_area( | |
2084 | lsa, out_if->area); | |
2085 | if (IS_DEBUG_OSPF_EVENT) | |
2086 | zlog_debug( | |
2087 | "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", | |
2088 | (void *)lsa, | |
2089 | (int)lsa->data | |
2090 | ->type); | |
2091 | ospf_lsa_discard(lsa); | |
2092 | Flag = 1; | |
2093 | } | |
2094 | break; | |
2095 | } | |
2096 | } | |
2097 | if (Flag) | |
2098 | continue; | |
2099 | } | |
2100 | ||
2101 | /* (5) Find the instance of this LSA that is currently contained | |
2102 | in the router's link state database. If there is no | |
2103 | database copy, or the received LSA is more recent than | |
2104 | the database copy the following steps must be performed. | |
2105 | (The sub steps from RFC 2328 section 13 step (5) will be | |
2106 | performed in | |
2107 | ospf_flood() ) */ | |
2108 | ||
2109 | if (current == NULL | |
2110 | || (ret = ospf_lsa_more_recent(current, lsa)) < 0) { | |
76c1efd7 CS |
2111 | /* CVE-2017-3224 */ |
2112 | if (current && (lsa->data->ls_seqnum == | |
2113 | htonl(OSPF_MAX_SEQUENCE_NUMBER) | |
2114 | && !IS_LSA_MAXAGE(lsa))) { | |
2115 | zlog_debug( | |
2116 | "Link State Update[%s]: has Max Seq but not MaxAge. Dropping it", | |
2117 | dump_lsa_key(lsa)); | |
2118 | ||
2119 | DISCARD_LSA(lsa, 4); | |
76c1efd7 CS |
2120 | } |
2121 | ||
d62a17ae | 2122 | /* Actual flooding procedure. */ |
2123 | if (ospf_flood(oi->ospf, nbr, current, lsa) | |
2124 | < 0) /* Trap NSSA later. */ | |
76c1efd7 | 2125 | DISCARD_LSA(lsa, 5); |
d62a17ae | 2126 | continue; |
2127 | } | |
2128 | ||
2129 | /* (6) Else, If there is an instance of the LSA on the sending | |
2130 | neighbor's Link state request list, an error has occurred in | |
2131 | the Database Exchange process. In this case, restart the | |
2132 | Database Exchange process by generating the neighbor event | |
2133 | BadLSReq for the sending neighbor and stop processing the | |
2134 | Link State Update packet. */ | |
2135 | ||
2136 | if (ospf_ls_request_lookup(nbr, lsa)) { | |
2137 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
c9cc11f6 | 2138 | flog_warn( |
cf444bcf | 2139 | EC_OSPF_PACKET, |
d62a17ae | 2140 | "LSA[%s] instance exists on Link state request list", |
2141 | dump_lsa_key(lsa)); | |
2142 | ||
2143 | /* Clean list of LSAs. */ | |
2144 | ospf_upd_list_clean(lsas); | |
2145 | /* this lsa is not on lsas list already. */ | |
2146 | ospf_lsa_discard(lsa); | |
2147 | return; | |
2148 | } | |
2149 | ||
2150 | /* If the received LSA is the same instance as the database copy | |
2151 | (i.e., neither one is more recent) the following two steps | |
2152 | should be performed: */ | |
2153 | ||
2154 | if (ret == 0) { | |
2155 | /* If the LSA is listed in the Link state retransmission | |
2156 | list | |
2157 | for the receiving adjacency, the router itself is | |
2158 | expecting | |
2159 | an acknowledgment for this LSA. The router should | |
2160 | treat the | |
2161 | received LSA as an acknowledgment by removing the LSA | |
2162 | from | |
2163 | the Link state retransmission list. This is termed | |
2164 | an | |
2165 | "implied acknowledgment". */ | |
2166 | ||
2167 | ls_ret = ospf_ls_retransmit_lookup(nbr, lsa); | |
2168 | ||
2169 | if (ls_ret != NULL) { | |
2170 | ospf_ls_retransmit_delete(nbr, ls_ret); | |
2171 | ||
2172 | /* Delayed acknowledgment sent if advertisement | |
2173 | received | |
2174 | from Designated Router, otherwise do nothing. | |
2175 | */ | |
2176 | if (oi->state == ISM_Backup) | |
2177 | if (NBR_IS_DR(nbr)) | |
2178 | listnode_add( | |
2179 | oi->ls_ack, | |
2180 | ospf_lsa_lock(lsa)); | |
2181 | ||
76c1efd7 | 2182 | DISCARD_LSA(lsa, 6); |
d62a17ae | 2183 | } else |
2184 | /* Acknowledge the receipt of the LSA by sending a | |
2185 | Link State Acknowledgment packet back out the | |
2186 | receiving | |
2187 | interface. */ | |
2188 | { | |
2189 | ospf_ls_ack_send(nbr, lsa); | |
76c1efd7 | 2190 | DISCARD_LSA(lsa, 7); |
d62a17ae | 2191 | } |
2192 | } | |
2193 | ||
2194 | /* The database copy is more recent. If the database copy | |
2195 | has LS age equal to MaxAge and LS sequence number equal to | |
2196 | MaxSequenceNumber, simply discard the received LSA without | |
2197 | acknowledging it. (In this case, the LSA's LS sequence number | |
2198 | is | |
2199 | wrapping, and the MaxSequenceNumber LSA must be completely | |
2200 | flushed before any new LSA instance can be introduced). */ | |
2201 | ||
2202 | else if (ret > 0) /* Database copy is more recent */ | |
2203 | { | |
2204 | if (IS_LSA_MAXAGE(current) | |
2205 | && current->data->ls_seqnum | |
2206 | == htonl(OSPF_MAX_SEQUENCE_NUMBER)) { | |
76c1efd7 | 2207 | DISCARD_LSA(lsa, 8); |
d62a17ae | 2208 | } |
2209 | /* Otherwise, as long as the database copy has not been | |
2210 | sent in a | |
2211 | Link State Update within the last MinLSArrival | |
2212 | seconds, send the | |
2213 | database copy back to the sending neighbor, | |
2214 | encapsulated within | |
2215 | a Link State Update Packet. The Link State Update | |
2216 | Packet should | |
2217 | be sent directly to the neighbor. In so doing, do not | |
2218 | put the | |
2219 | database copy of the LSA on the neighbor's link state | |
2220 | retransmission list, and do not acknowledge the | |
2221 | received (less | |
2222 | recent) LSA instance. */ | |
2223 | else { | |
2224 | if (monotime_since(¤t->tv_orig, NULL) | |
2225 | >= ospf->min_ls_arrival * 1000LL) | |
2226 | /* Trap NSSA type later.*/ | |
2227 | ospf_ls_upd_send_lsa( | |
2228 | nbr, current, | |
2229 | OSPF_SEND_PACKET_DIRECT); | |
76c1efd7 | 2230 | DISCARD_LSA(lsa, 9); |
d62a17ae | 2231 | } |
2232 | } | |
2233 | } | |
2cd754de PJ |
2234 | #undef DISCARD_LSA |
2235 | ||
d62a17ae | 2236 | assert(listcount(lsas) == 0); |
6a154c88 | 2237 | list_delete(&lsas); |
718e3744 | 2238 | } |
2239 | ||
2240 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
d62a17ae | 2241 | static void ospf_ls_ack(struct ip *iph, struct ospf_header *ospfh, |
2242 | struct stream *s, struct ospf_interface *oi, | |
d7c0a89a | 2243 | uint16_t size) |
d62a17ae | 2244 | { |
2245 | struct ospf_neighbor *nbr; | |
2246 | ||
2247 | /* increment statistics. */ | |
2248 | oi->ls_ack_in++; | |
2249 | ||
2250 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
2251 | if (nbr == NULL) { | |
cf444bcf | 2252 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 2253 | "Link State Acknowledgment: Unknown Neighbor %s.", |
d62a17ae | 2254 | inet_ntoa(ospfh->router_id)); |
2255 | return; | |
2256 | } | |
2257 | ||
2258 | /* Add event to thread. */ | |
2259 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
2260 | ||
2261 | if (nbr->state < NSM_Exchange) { | |
2262 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
2263 | zlog_debug( | |
2264 | "Link State Acknowledgment: " | |
2265 | "Neighbor[%s] state %s is less than Exchange", | |
2266 | inet_ntoa(ospfh->router_id), | |
2267 | lookup_msg(ospf_nsm_state_msg, nbr->state, | |
2268 | NULL)); | |
2269 | return; | |
2270 | } | |
2271 | ||
2272 | while (size >= OSPF_LSA_HEADER_SIZE) { | |
2273 | struct ospf_lsa *lsa, *lsr; | |
2274 | ||
2275 | lsa = ospf_lsa_new(); | |
2d34fb80 | 2276 | lsa->data = (struct lsa_header *)stream_pnt(s); |
b5a8894d | 2277 | lsa->vrf_id = oi->ospf->vrf_id; |
d62a17ae | 2278 | |
2d34fb80 | 2279 | /* lsah = (struct lsa_header *) stream_pnt (s); */ |
d62a17ae | 2280 | size -= OSPF_LSA_HEADER_SIZE; |
2281 | stream_forward_getp(s, OSPF_LSA_HEADER_SIZE); | |
2282 | ||
2283 | if (lsa->data->type < OSPF_MIN_LSA | |
2284 | || lsa->data->type >= OSPF_MAX_LSA) { | |
2285 | lsa->data = NULL; | |
2286 | ospf_lsa_discard(lsa); | |
2287 | continue; | |
2288 | } | |
2289 | ||
2290 | lsr = ospf_ls_retransmit_lookup(nbr, lsa); | |
2291 | ||
2292 | if (lsr != NULL && ospf_lsa_more_recent(lsr, lsa) == 0) | |
2293 | ospf_ls_retransmit_delete(nbr, lsr); | |
2294 | ||
2295 | lsa->data = NULL; | |
2296 | ospf_lsa_discard(lsa); | |
2297 | } | |
2298 | ||
2299 | return; | |
2300 | } | |
2301 | ||
b5a8894d CS |
2302 | static struct stream *ospf_recv_packet(struct ospf *ospf, int fd, |
2303 | struct interface **ifp, | |
d62a17ae | 2304 | struct stream *ibuf) |
2305 | { | |
2306 | int ret; | |
2307 | struct ip *iph; | |
d7c0a89a | 2308 | uint16_t ip_len; |
d62a17ae | 2309 | ifindex_t ifindex = 0; |
2310 | struct iovec iov; | |
2311 | /* Header and data both require alignment. */ | |
2312 | char buff[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; | |
2313 | struct msghdr msgh; | |
2314 | ||
2315 | memset(&msgh, 0, sizeof(struct msghdr)); | |
2316 | msgh.msg_iov = &iov; | |
2317 | msgh.msg_iovlen = 1; | |
2318 | msgh.msg_control = (caddr_t)buff; | |
2319 | msgh.msg_controllen = sizeof(buff); | |
2320 | ||
2321 | ret = stream_recvmsg(ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE + 1); | |
2322 | if (ret < 0) { | |
cf444bcf | 2323 | flog_warn(EC_OSPF_PACKET, "stream_recvmsg failed: %s", |
c9cc11f6 | 2324 | safe_strerror(errno)); |
d62a17ae | 2325 | return NULL; |
2326 | } | |
2327 | if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */ | |
718e3744 | 2328 | { |
c9cc11f6 | 2329 | flog_warn( |
cf444bcf | 2330 | EC_OSPF_PACKET, |
d62a17ae | 2331 | "ospf_recv_packet: discarding runt packet of length %d " |
2332 | "(ip header size is %u)", | |
d7c0a89a | 2333 | ret, (unsigned int)sizeof(iph)); |
d62a17ae | 2334 | return NULL; |
2335 | } | |
2336 | ||
2337 | /* Note that there should not be alignment problems with this assignment | |
2338 | because this is at the beginning of the stream data buffer. */ | |
2339 | iph = (struct ip *)STREAM_DATA(ibuf); | |
2340 | sockopt_iphdrincl_swab_systoh(iph); | |
2341 | ||
2342 | ip_len = iph->ip_len; | |
2343 | ||
de5ccb96 | 2344 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000) |
d62a17ae | 2345 | /* |
2346 | * Kernel network code touches incoming IP header parameters, | |
2347 | * before protocol specific processing. | |
2348 | * | |
2349 | * 1) Convert byteorder to host representation. | |
2350 | * --> ip_len, ip_id, ip_off | |
2351 | * | |
2352 | * 2) Adjust ip_len to strip IP header size! | |
2353 | * --> If user process receives entire IP packet via RAW | |
2354 | * socket, it must consider adding IP header size to | |
2355 | * the "ip_len" field of "ip" structure. | |
2356 | * | |
2357 | * For more details, see <netinet/ip_input.c>. | |
2358 | */ | |
2359 | ip_len = ip_len + (iph->ip_hl << 2); | |
718e3744 | 2360 | #endif |
d62a17ae | 2361 | |
0150c9c9 | 2362 | #if defined(__DragonFly__) |
d62a17ae | 2363 | /* |
2364 | * in DragonFly's raw socket, ip_len/ip_off are read | |
2365 | * in network byte order. | |
2366 | * As OpenBSD < 200311 adjust ip_len to strip IP header size! | |
2367 | */ | |
2368 | ip_len = ntohs(iph->ip_len) + (iph->ip_hl << 2); | |
0150c9c9 DB |
2369 | #endif |
2370 | ||
d62a17ae | 2371 | ifindex = getsockopt_ifindex(AF_INET, &msgh); |
2372 | ||
b5a8894d | 2373 | *ifp = if_lookup_by_index(ifindex, ospf->vrf_id); |
d62a17ae | 2374 | |
2375 | if (ret != ip_len) { | |
c9cc11f6 | 2376 | flog_warn( |
cf444bcf | 2377 | EC_OSPF_PACKET, |
d62a17ae | 2378 | "ospf_recv_packet read length mismatch: ip_len is %d, " |
2379 | "but recvmsg returned %d", | |
2380 | ip_len, ret); | |
2381 | return NULL; | |
2382 | } | |
718e3744 | 2383 | |
868a0861 DS |
2384 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) |
2385 | zlog_debug("%s: fd %d(%s) on interface %d(%s)", | |
2386 | __PRETTY_FUNCTION__, fd, ospf_get_name(ospf), | |
2387 | ifindex, *ifp ? (*ifp)->name : "Unknown"); | |
d62a17ae | 2388 | return ibuf; |
718e3744 | 2389 | } |
2390 | ||
4dadc291 | 2391 | static struct ospf_interface * |
d62a17ae | 2392 | ospf_associate_packet_vl(struct ospf *ospf, struct interface *ifp, |
2393 | struct ip *iph, struct ospf_header *ospfh) | |
2394 | { | |
2395 | struct ospf_interface *rcv_oi; | |
2396 | struct ospf_vl_data *vl_data; | |
2397 | struct ospf_area *vl_area; | |
2398 | struct listnode *node; | |
2399 | ||
2400 | if (IN_MULTICAST(ntohl(iph->ip_dst.s_addr)) | |
2401 | || !OSPF_IS_AREA_BACKBONE(ospfh)) | |
2402 | return NULL; | |
2403 | ||
2404 | /* look for local OSPF interface matching the destination | |
2405 | * to determine Area ID. We presume therefore the destination address | |
2406 | * is unique, or at least (for "unnumbered" links), not used in other | |
2407 | * areas | |
2408 | */ | |
2409 | if ((rcv_oi = ospf_if_lookup_by_local_addr(ospf, NULL, iph->ip_dst)) | |
2410 | == NULL) | |
2411 | return NULL; | |
2412 | ||
2413 | for (ALL_LIST_ELEMENTS_RO(ospf->vlinks, node, vl_data)) { | |
2414 | vl_area = | |
2415 | ospf_area_lookup_by_area_id(ospf, vl_data->vl_area_id); | |
2416 | if (!vl_area) | |
2417 | continue; | |
2418 | ||
2419 | if (OSPF_AREA_SAME(&vl_area, &rcv_oi->area) | |
2420 | && IPV4_ADDR_SAME(&vl_data->vl_peer, &ospfh->router_id)) { | |
2421 | if (IS_DEBUG_OSPF_EVENT) | |
2422 | zlog_debug("associating packet with %s", | |
2423 | IF_NAME(vl_data->vl_oi)); | |
2424 | if (!CHECK_FLAG(vl_data->vl_oi->ifp->flags, IFF_UP)) { | |
2425 | if (IS_DEBUG_OSPF_EVENT) | |
2426 | zlog_debug( | |
2427 | "This VL is not up yet, sorry"); | |
2428 | return NULL; | |
2429 | } | |
2430 | ||
2431 | return vl_data->vl_oi; | |
2432 | } | |
718e3744 | 2433 | } |
718e3744 | 2434 | |
d62a17ae | 2435 | if (IS_DEBUG_OSPF_EVENT) |
2436 | zlog_debug("couldn't find any VL to associate the packet with"); | |
2437 | ||
2438 | return NULL; | |
718e3744 | 2439 | } |
2440 | ||
d62a17ae | 2441 | static int ospf_check_area_id(struct ospf_interface *oi, |
2442 | struct ospf_header *ospfh) | |
718e3744 | 2443 | { |
d62a17ae | 2444 | /* Check match the Area ID of the receiving interface. */ |
2445 | if (OSPF_AREA_SAME(&oi->area, &ospfh)) | |
2446 | return 1; | |
718e3744 | 2447 | |
d62a17ae | 2448 | return 0; |
718e3744 | 2449 | } |
2450 | ||
2451 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2452 | To prevent it, compare src IP address and i/f address with masking | |
2453 | i/f network mask. */ | |
d62a17ae | 2454 | static int ospf_check_network_mask(struct ospf_interface *oi, |
2455 | struct in_addr ip_src) | |
718e3744 | 2456 | { |
d62a17ae | 2457 | struct in_addr mask, me, him; |
718e3744 | 2458 | |
d62a17ae | 2459 | if (oi->type == OSPF_IFTYPE_POINTOPOINT |
2460 | || oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2461 | return 1; | |
718e3744 | 2462 | |
d62a17ae | 2463 | masklen2ip(oi->address->prefixlen, &mask); |
718e3744 | 2464 | |
d62a17ae | 2465 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; |
2466 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
718e3744 | 2467 | |
d62a17ae | 2468 | if (IPV4_ADDR_SAME(&me, &him)) |
2469 | return 1; | |
718e3744 | 2470 | |
d62a17ae | 2471 | return 0; |
718e3744 | 2472 | } |
2473 | ||
bd5651f0 DO |
2474 | /* Return 1, if the packet is properly authenticated and checksummed, |
2475 | 0 otherwise. In particular, check that AuType header field is valid and | |
2476 | matches the locally configured AuType, and that D.5 requirements are met. */ | |
d62a17ae | 2477 | static int ospf_check_auth(struct ospf_interface *oi, struct ospf_header *ospfh) |
2478 | { | |
2479 | struct crypt_key *ck; | |
d7c0a89a QY |
2480 | uint16_t iface_auth_type; |
2481 | uint16_t pkt_auth_type = ntohs(ospfh->auth_type); | |
d62a17ae | 2482 | |
2483 | switch (pkt_auth_type) { | |
2484 | case OSPF_AUTH_NULL: /* RFC2328 D.5.1 */ | |
2485 | if (OSPF_AUTH_NULL != (iface_auth_type = ospf_auth_type(oi))) { | |
2486 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2487 | flog_warn( |
cf444bcf | 2488 | EC_OSPF_PACKET, |
d62a17ae | 2489 | "interface %s: auth-type mismatch, local %s, rcvd Null", |
2490 | IF_NAME(oi), | |
2491 | lookup_msg(ospf_auth_type_str, | |
2492 | iface_auth_type, NULL)); | |
2493 | return 0; | |
2494 | } | |
2495 | if (!ospf_check_sum(ospfh)) { | |
2496 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2497 | flog_warn( |
cf444bcf | 2498 | EC_OSPF_PACKET, |
d62a17ae | 2499 | "interface %s: Null auth OK, but checksum error, Router-ID %s", |
2500 | IF_NAME(oi), | |
2501 | inet_ntoa(ospfh->router_id)); | |
2502 | return 0; | |
2503 | } | |
2504 | return 1; | |
2505 | case OSPF_AUTH_SIMPLE: /* RFC2328 D.5.2 */ | |
2506 | if (OSPF_AUTH_SIMPLE | |
2507 | != (iface_auth_type = ospf_auth_type(oi))) { | |
2508 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2509 | flog_warn( |
cf444bcf | 2510 | EC_OSPF_PACKET, |
d62a17ae | 2511 | "interface %s: auth-type mismatch, local %s, rcvd Simple", |
2512 | IF_NAME(oi), | |
2513 | lookup_msg(ospf_auth_type_str, | |
2514 | iface_auth_type, NULL)); | |
2515 | return 0; | |
2516 | } | |
2517 | if (memcmp(OSPF_IF_PARAM(oi, auth_simple), ospfh->u.auth_data, | |
2518 | OSPF_AUTH_SIMPLE_SIZE)) { | |
2519 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
cf444bcf | 2520 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 2521 | "interface %s: Simple auth failed", |
d62a17ae | 2522 | IF_NAME(oi)); |
2523 | return 0; | |
2524 | } | |
2525 | if (!ospf_check_sum(ospfh)) { | |
2526 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2527 | flog_warn( |
cf444bcf | 2528 | EC_OSPF_PACKET, |
d62a17ae | 2529 | "interface %s: Simple auth OK, checksum error, Router-ID %s", |
2530 | IF_NAME(oi), | |
2531 | inet_ntoa(ospfh->router_id)); | |
2532 | return 0; | |
2533 | } | |
2534 | return 1; | |
2535 | case OSPF_AUTH_CRYPTOGRAPHIC: /* RFC2328 D.5.3 */ | |
2536 | if (OSPF_AUTH_CRYPTOGRAPHIC | |
2537 | != (iface_auth_type = ospf_auth_type(oi))) { | |
2538 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2539 | flog_warn( |
cf444bcf | 2540 | EC_OSPF_PACKET, |
d62a17ae | 2541 | "interface %s: auth-type mismatch, local %s, rcvd Cryptographic", |
2542 | IF_NAME(oi), | |
2543 | lookup_msg(ospf_auth_type_str, | |
2544 | iface_auth_type, NULL)); | |
2545 | return 0; | |
2546 | } | |
2547 | if (ospfh->checksum) { | |
2548 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2549 | flog_warn( |
cf444bcf | 2550 | EC_OSPF_PACKET, |
d62a17ae | 2551 | "interface %s: OSPF header checksum is not 0", |
2552 | IF_NAME(oi)); | |
2553 | return 0; | |
2554 | } | |
2555 | /* only MD5 crypto method can pass ospf_packet_examin() */ | |
996c9314 LB |
2556 | if (NULL == (ck = listgetdata( |
2557 | listtail(OSPF_IF_PARAM(oi, auth_crypt)))) | |
2558 | || ospfh->u.crypt.key_id != ck->key_id || | |
2559 | /* Condition above uses the last key ID on the list, | |
2560 | which is | |
2561 | different from what ospf_crypt_key_lookup() does. A | |
2562 | bug? */ | |
2563 | !ospf_check_md5_digest(oi, ospfh)) { | |
d62a17ae | 2564 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) |
cf444bcf | 2565 | flog_warn(EC_OSPF_MD5, |
c9cc11f6 | 2566 | "interface %s: MD5 auth failed", |
d62a17ae | 2567 | IF_NAME(oi)); |
2568 | return 0; | |
2569 | } | |
2570 | return 1; | |
2571 | default: | |
2572 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
c9cc11f6 | 2573 | flog_warn( |
cf444bcf | 2574 | EC_OSPF_PACKET, |
d62a17ae | 2575 | "interface %s: invalid packet auth-type (%02x)", |
2576 | IF_NAME(oi), pkt_auth_type); | |
2577 | return 0; | |
2578 | } | |
2579 | } | |
2580 | ||
2581 | static int ospf_check_sum(struct ospf_header *ospfh) | |
2582 | { | |
d7c0a89a QY |
2583 | uint32_t ret; |
2584 | uint16_t sum; | |
d62a17ae | 2585 | |
2586 | /* clear auth_data for checksum. */ | |
2587 | memset(ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2588 | ||
2589 | /* keep checksum and clear. */ | |
2590 | sum = ospfh->checksum; | |
d7c0a89a | 2591 | memset(&ospfh->checksum, 0, sizeof(uint16_t)); |
d62a17ae | 2592 | |
2593 | /* calculate checksum. */ | |
2594 | ret = in_cksum(ospfh, ntohs(ospfh->length)); | |
2595 | ||
2596 | if (ret != sum) { | |
2597 | zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2598 | ret, sum); | |
2599 | return 0; | |
2600 | } | |
2601 | ||
2602 | return 1; | |
718e3744 | 2603 | } |
2604 | ||
4e31de79 DO |
2605 | /* Verify, that given link/TOS records are properly sized/aligned and match |
2606 | Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */ | |
d62a17ae | 2607 | static unsigned ospf_router_lsa_links_examin(struct router_lsa_link *link, |
d7c0a89a QY |
2608 | uint16_t linkbytes, |
2609 | const uint16_t num_links) | |
d62a17ae | 2610 | { |
2611 | unsigned counted_links = 0, thislinklen; | |
2612 | ||
2613 | while (linkbytes) { | |
2614 | thislinklen = | |
2615 | OSPF_ROUTER_LSA_LINK_SIZE + 4 * link->m[0].tos_count; | |
2616 | if (thislinklen > linkbytes) { | |
2617 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2618 | zlog_debug("%s: length error in link block #%u", | |
2619 | __func__, counted_links); | |
2620 | return MSG_NG; | |
2621 | } | |
2622 | link = (struct router_lsa_link *)((caddr_t)link + thislinklen); | |
2623 | linkbytes -= thislinklen; | |
2624 | counted_links++; | |
2625 | } | |
2626 | if (counted_links != num_links) { | |
2627 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2628 | zlog_debug("%s: %u link blocks declared, %u present", | |
2629 | __func__, num_links, counted_links); | |
2630 | return MSG_NG; | |
2631 | } | |
2632 | return MSG_OK; | |
4e31de79 DO |
2633 | } |
2634 | ||
2635 | /* Verify, that the given LSA is properly sized/aligned (including type-specific | |
2636 | minimum length constraint). */ | |
d7c0a89a QY |
2637 | static unsigned ospf_lsa_examin(struct lsa_header *lsah, const uint16_t lsalen, |
2638 | const uint8_t headeronly) | |
d62a17ae | 2639 | { |
2640 | unsigned ret; | |
2641 | struct router_lsa *rlsa; | |
2642 | if (lsah->type < OSPF_MAX_LSA && ospf_lsa_minlen[lsah->type] | |
2643 | && lsalen < OSPF_LSA_HEADER_SIZE + ospf_lsa_minlen[lsah->type]) { | |
2644 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2645 | zlog_debug("%s: undersized (%u B) %s", __func__, lsalen, | |
2646 | lookup_msg(ospf_lsa_type_msg, lsah->type, | |
2647 | NULL)); | |
2648 | return MSG_NG; | |
2649 | } | |
2650 | switch (lsah->type) { | |
2651 | case OSPF_ROUTER_LSA: | |
2652 | /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1 | |
2653 | * (12+)-byte link blocks */ | |
2654 | if (headeronly) { | |
2655 | ret = (lsalen - OSPF_LSA_HEADER_SIZE | |
2656 | - OSPF_ROUTER_LSA_MIN_SIZE) | |
2657 | % 4 | |
2658 | ? MSG_NG | |
2659 | : MSG_OK; | |
2660 | break; | |
2661 | } | |
2662 | rlsa = (struct router_lsa *)lsah; | |
2663 | ret = ospf_router_lsa_links_examin( | |
2664 | (struct router_lsa_link *)rlsa->link, | |
2665 | lsalen - OSPF_LSA_HEADER_SIZE - 4, /* skip: basic | |
2666 | header, "flags", | |
2667 | 0, "# links" */ | |
2668 | ntohs(rlsa->links) /* 16 bits */ | |
9d303b37 | 2669 | ); |
d62a17ae | 2670 | break; |
2671 | case OSPF_AS_EXTERNAL_LSA: | |
2672 | /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long | |
2673 | * blocks */ | |
2674 | case OSPF_AS_NSSA_LSA: | |
2675 | /* RFC3101 C, idem */ | |
2676 | ret = (lsalen - OSPF_LSA_HEADER_SIZE | |
2677 | - OSPF_AS_EXTERNAL_LSA_MIN_SIZE) | |
2678 | % 12 | |
2679 | ? MSG_NG | |
2680 | : MSG_OK; | |
2681 | break; | |
2682 | /* Following LSA types are considered OK length-wise as soon as their | |
2683 | * minimum | |
2684 | * length constraint is met and length of the whole LSA is a multiple of | |
2685 | * 4 | |
2686 | * (basic LSA header size is already a multiple of 4). */ | |
2687 | case OSPF_NETWORK_LSA: | |
2688 | /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */ | |
2689 | case OSPF_SUMMARY_LSA: | |
2690 | case OSPF_ASBR_SUMMARY_LSA: | |
2691 | /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS | |
2692 | * blocks */ | |
2693 | case OSPF_OPAQUE_LINK_LSA: | |
2694 | case OSPF_OPAQUE_AREA_LSA: | |
2695 | case OSPF_OPAQUE_AS_LSA: | |
2696 | /* RFC5250 A.2, "some number of octets (of application-specific | |
2697 | * data) padded to 32-bit alignment." This is considered | |
2698 | * equivalent | |
2699 | * to 4-byte alignment of all other LSA types, see | |
2700 | * OSPF-ALIGNMENT.txt | |
2701 | * file for the detailed analysis of this passage. */ | |
2702 | ret = lsalen % 4 ? MSG_NG : MSG_OK; | |
2703 | break; | |
2704 | default: | |
2705 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2706 | zlog_debug("%s: unsupported LSA type 0x%02x", __func__, | |
2707 | lsah->type); | |
2708 | return MSG_NG; | |
2709 | } | |
2710 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2711 | zlog_debug("%s: alignment error in %s", __func__, | |
2712 | lookup_msg(ospf_lsa_type_msg, lsah->type, NULL)); | |
2713 | return ret; | |
4e31de79 DO |
2714 | } |
2715 | ||
2716 | /* Verify if the provided input buffer is a valid sequence of LSAs. This | |
2717 | includes verification of LSA blocks length/alignment and dispatching | |
2718 | of deeper-level checks. */ | |
2719 | static unsigned | |
d62a17ae | 2720 | ospf_lsaseq_examin(struct lsa_header *lsah, /* start of buffered data */ |
d7c0a89a | 2721 | size_t length, const uint8_t headeronly, |
d62a17ae | 2722 | /* When declared_num_lsas is not 0, compare it to the real |
2723 | number of LSAs | |
2724 | and treat the difference as an error. */ | |
d7c0a89a | 2725 | const uint32_t declared_num_lsas) |
d62a17ae | 2726 | { |
d7c0a89a | 2727 | uint32_t counted_lsas = 0; |
d62a17ae | 2728 | |
2729 | while (length) { | |
d7c0a89a | 2730 | uint16_t lsalen; |
d62a17ae | 2731 | if (length < OSPF_LSA_HEADER_SIZE) { |
2732 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2733 | zlog_debug( | |
2734 | "%s: undersized (%zu B) trailing (#%u) LSA header", | |
2735 | __func__, length, counted_lsas); | |
2736 | return MSG_NG; | |
2737 | } | |
2738 | /* save on ntohs() calls here and in the LSA validator */ | |
2739 | lsalen = ntohs(lsah->length); | |
2740 | if (lsalen < OSPF_LSA_HEADER_SIZE) { | |
2741 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2742 | zlog_debug( | |
2743 | "%s: malformed LSA header #%u, declared length is %u B", | |
2744 | __func__, counted_lsas, lsalen); | |
2745 | return MSG_NG; | |
2746 | } | |
2747 | if (headeronly) { | |
2748 | /* less checks here and in ospf_lsa_examin() */ | |
2749 | if (MSG_OK != ospf_lsa_examin(lsah, lsalen, 1)) { | |
2750 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2751 | zlog_debug( | |
2752 | "%s: malformed header-only LSA #%u", | |
2753 | __func__, counted_lsas); | |
2754 | return MSG_NG; | |
2755 | } | |
2756 | lsah = (struct lsa_header *)((caddr_t)lsah | |
2757 | + OSPF_LSA_HEADER_SIZE); | |
2758 | length -= OSPF_LSA_HEADER_SIZE; | |
2759 | } else { | |
2760 | /* make sure the input buffer is deep enough before | |
2761 | * further checks */ | |
2762 | if (lsalen > length) { | |
2763 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2764 | zlog_debug( | |
2765 | "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B", | |
2766 | __func__, counted_lsas, lsalen, | |
2767 | length); | |
2768 | return MSG_NG; | |
2769 | } | |
2770 | if (MSG_OK != ospf_lsa_examin(lsah, lsalen, 0)) { | |
2771 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2772 | zlog_debug("%s: malformed LSA #%u", | |
2773 | __func__, counted_lsas); | |
2774 | return MSG_NG; | |
2775 | } | |
2776 | lsah = (struct lsa_header *)((caddr_t)lsah + lsalen); | |
2777 | length -= lsalen; | |
2778 | } | |
2779 | counted_lsas++; | |
2780 | } | |
2781 | ||
2782 | if (declared_num_lsas && counted_lsas != declared_num_lsas) { | |
2783 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2784 | zlog_debug( | |
2785 | "%s: #LSAs declared (%u) does not match actual (%u)", | |
2786 | __func__, declared_num_lsas, counted_lsas); | |
2787 | return MSG_NG; | |
2788 | } | |
2789 | return MSG_OK; | |
4e31de79 DO |
2790 | } |
2791 | ||
75c8eabb | 2792 | /* Verify a complete OSPF packet for proper sizing/alignment. */ |
d62a17ae | 2793 | static unsigned ospf_packet_examin(struct ospf_header *oh, |
2794 | const unsigned bytesonwire) | |
2795 | { | |
d7c0a89a | 2796 | uint16_t bytesdeclared, bytesauth; |
d62a17ae | 2797 | unsigned ret; |
2798 | struct ospf_ls_update *lsupd; | |
2799 | ||
2800 | /* Length, 1st approximation. */ | |
2801 | if (bytesonwire < OSPF_HEADER_SIZE) { | |
2802 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2803 | zlog_debug("%s: undersized (%u B) packet", __func__, | |
2804 | bytesonwire); | |
2805 | return MSG_NG; | |
2806 | } | |
2807 | /* Now it is safe to access header fields. Performing length check, | |
2808 | * allow | |
2809 | * for possible extra bytes of crypto auth/padding, which are not | |
2810 | * counted | |
2811 | * in the OSPF header "length" field. */ | |
2812 | if (oh->version != OSPF_VERSION) { | |
2813 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2814 | zlog_debug("%s: invalid (%u) protocol version", | |
2815 | __func__, oh->version); | |
2816 | return MSG_NG; | |
2817 | } | |
2818 | bytesdeclared = ntohs(oh->length); | |
2819 | if (ntohs(oh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2820 | bytesauth = 0; | |
2821 | else { | |
2822 | if (oh->u.crypt.auth_data_len != OSPF_AUTH_MD5_SIZE) { | |
2823 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2824 | zlog_debug( | |
2825 | "%s: unsupported crypto auth length (%u B)", | |
2826 | __func__, oh->u.crypt.auth_data_len); | |
2827 | return MSG_NG; | |
2828 | } | |
2829 | bytesauth = OSPF_AUTH_MD5_SIZE; | |
2830 | } | |
2831 | if (bytesdeclared + bytesauth > bytesonwire) { | |
2832 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2833 | zlog_debug( | |
2834 | "%s: packet length error (%u real, %u+%u declared)", | |
2835 | __func__, bytesonwire, bytesdeclared, | |
2836 | bytesauth); | |
2837 | return MSG_NG; | |
2838 | } | |
2839 | /* Length, 2nd approximation. The type-specific constraint is checked | |
2840 | against declared length, not amount of bytes on wire. */ | |
2841 | if (oh->type >= OSPF_MSG_HELLO && oh->type <= OSPF_MSG_LS_ACK | |
2842 | && bytesdeclared | |
2843 | < OSPF_HEADER_SIZE + ospf_packet_minlen[oh->type]) { | |
2844 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2845 | zlog_debug("%s: undersized (%u B) %s packet", __func__, | |
2846 | bytesdeclared, | |
2847 | lookup_msg(ospf_packet_type_str, oh->type, | |
2848 | NULL)); | |
2849 | return MSG_NG; | |
2850 | } | |
2851 | switch (oh->type) { | |
2852 | case OSPF_MSG_HELLO: | |
2853 | /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes | |
2854 | followed | |
2855 | by N>=0 router-IDs. */ | |
2856 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_HELLO_MIN_SIZE) | |
2857 | % 4 | |
2858 | ? MSG_NG | |
2859 | : MSG_OK; | |
2860 | break; | |
2861 | case OSPF_MSG_DB_DESC: | |
2862 | /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes | |
2863 | followed | |
2864 | by N>=0 header-only LSAs. */ | |
2865 | ret = ospf_lsaseq_examin( | |
2866 | (struct lsa_header *)((caddr_t)oh + OSPF_HEADER_SIZE | |
2867 | + OSPF_DB_DESC_MIN_SIZE), | |
2868 | bytesdeclared - OSPF_HEADER_SIZE | |
2869 | - OSPF_DB_DESC_MIN_SIZE, | |
2870 | 1, /* header-only LSAs */ | |
2871 | 0); | |
2872 | break; | |
2873 | case OSPF_MSG_LS_REQ: | |
2874 | /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes | |
2875 | * request blocks. */ | |
2876 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_REQ_MIN_SIZE) | |
2877 | % OSPF_LSA_KEY_SIZE | |
2878 | ? MSG_NG | |
2879 | : MSG_OK; | |
2880 | break; | |
2881 | case OSPF_MSG_LS_UPD: | |
2882 | /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes | |
2883 | followed | |
2884 | by N>=0 full LSAs (with N declared beforehand). */ | |
2885 | lsupd = (struct ospf_ls_update *)((caddr_t)oh | |
2886 | + OSPF_HEADER_SIZE); | |
2887 | ret = ospf_lsaseq_examin( | |
2888 | (struct lsa_header *)((caddr_t)lsupd | |
2889 | + OSPF_LS_UPD_MIN_SIZE), | |
2890 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_UPD_MIN_SIZE, | |
2891 | 0, /* full LSAs */ | |
2892 | ntohl(lsupd->num_lsas) /* 32 bits */ | |
9d303b37 | 2893 | ); |
d62a17ae | 2894 | break; |
2895 | case OSPF_MSG_LS_ACK: | |
2896 | /* RFC2328 A.3.6, packet header followed by N>=0 header-only | |
2897 | * LSAs. */ | |
2898 | ret = ospf_lsaseq_examin( | |
2899 | (struct lsa_header *)((caddr_t)oh + OSPF_HEADER_SIZE | |
2900 | + OSPF_LS_ACK_MIN_SIZE), | |
2901 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_ACK_MIN_SIZE, | |
2902 | 1, /* header-only LSAs */ | |
2903 | 0); | |
2904 | break; | |
2905 | default: | |
2906 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2907 | zlog_debug("%s: invalid packet type 0x%02x", __func__, | |
2908 | oh->type); | |
2909 | return MSG_NG; | |
2910 | } | |
2911 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2912 | zlog_debug("%s: malformed %s packet", __func__, | |
2913 | lookup_msg(ospf_packet_type_str, oh->type, NULL)); | |
2914 | return ret; | |
75c8eabb DO |
2915 | } |
2916 | ||
718e3744 | 2917 | /* OSPF Header verification. */ |
d62a17ae | 2918 | static int ospf_verify_header(struct stream *ibuf, struct ospf_interface *oi, |
2919 | struct ip *iph, struct ospf_header *ospfh) | |
2920 | { | |
2921 | /* Check Area ID. */ | |
2922 | if (!ospf_check_area_id(oi, ospfh)) { | |
cf444bcf | 2923 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 2924 | "interface %s: ospf_read invalid Area ID %s.", |
d62a17ae | 2925 | IF_NAME(oi), inet_ntoa(ospfh->area_id)); |
2926 | return -1; | |
2927 | } | |
718e3744 | 2928 | |
d62a17ae | 2929 | /* Check network mask, Silently discarded. */ |
2930 | if (!ospf_check_network_mask(oi, iph->ip_src)) { | |
c9cc11f6 | 2931 | flog_warn( |
cf444bcf | 2932 | EC_OSPF_PACKET, |
d62a17ae | 2933 | "interface %s: ospf_read network address is not same [%s]", |
2934 | IF_NAME(oi), inet_ntoa(iph->ip_src)); | |
2935 | return -1; | |
2936 | } | |
718e3744 | 2937 | |
d62a17ae | 2938 | /* Check authentication. The function handles logging actions, where |
2939 | * required. */ | |
2940 | if (!ospf_check_auth(oi, ospfh)) | |
2941 | return -1; | |
718e3744 | 2942 | |
d62a17ae | 2943 | return 0; |
718e3744 | 2944 | } |
2945 | ||
2946 | /* Starting point of packet process function. */ | |
d62a17ae | 2947 | int ospf_read(struct thread *thread) |
2948 | { | |
2949 | int ret; | |
2950 | struct stream *ibuf; | |
2951 | struct ospf *ospf; | |
2952 | struct ospf_interface *oi; | |
2953 | struct ip *iph; | |
2954 | struct ospf_header *ospfh; | |
d7c0a89a | 2955 | uint16_t length; |
b5a8894d | 2956 | struct interface *ifp = NULL; |
d62a17ae | 2957 | struct connected *c; |
2958 | ||
2959 | /* first of all get interface pointer. */ | |
2960 | ospf = THREAD_ARG(thread); | |
2961 | ||
2962 | /* prepare for next packet. */ | |
2963 | ospf->t_read = NULL; | |
2964 | thread_add_read(master, ospf_read, ospf, ospf->fd, &ospf->t_read); | |
2965 | ||
2966 | stream_reset(ospf->ibuf); | |
b5a8894d CS |
2967 | ibuf = ospf_recv_packet(ospf, ospf->fd, &ifp, ospf->ibuf); |
2968 | if (ibuf == NULL) | |
d62a17ae | 2969 | return -1; |
2970 | /* This raw packet is known to be at least as big as its IP header. */ | |
2971 | ||
2972 | /* Note that there should not be alignment problems with this assignment | |
2973 | because this is at the beginning of the stream data buffer. */ | |
2974 | iph = (struct ip *)STREAM_DATA(ibuf); | |
2975 | /* Note that sockopt_iphdrincl_swab_systoh was called in | |
2976 | * ospf_recv_packet. */ | |
2977 | ||
2978 | if (ifp == NULL) { | |
2979 | /* Handle cases where the platform does not support retrieving | |
2980 | the ifindex, | |
2981 | and also platforms (such as Solaris 8) that claim to support | |
2982 | ifindex | |
2983 | retrieval but do not. */ | |
2984 | c = if_lookup_address((void *)&iph->ip_src, AF_INET, | |
b5a8894d | 2985 | ospf->vrf_id); |
d62a17ae | 2986 | if (c) |
2987 | ifp = c->ifp; | |
868a0861 DS |
2988 | if (ifp == NULL) { |
2989 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2990 | zlog_debug( | |
2991 | "%s: Unable to determine incoming interface from: %s(%s)", | |
2992 | __PRETTY_FUNCTION__, | |
2993 | inet_ntoa(iph->ip_src), | |
2994 | ospf_get_name(ospf)); | |
d62a17ae | 2995 | return 0; |
868a0861 | 2996 | } |
d62a17ae | 2997 | } |
2998 | ||
2999 | /* IP Header dump. */ | |
3000 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
3001 | ospf_ip_header_dump(iph); | |
3002 | ||
3003 | /* Self-originated packet should be discarded silently. */ | |
3004 | if (ospf_if_lookup_by_local_addr(ospf, NULL, iph->ip_src)) { | |
3005 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) { | |
3006 | zlog_debug( | |
3007 | "ospf_read[%s]: Dropping self-originated packet", | |
3008 | inet_ntoa(iph->ip_src)); | |
3009 | } | |
3010 | return 0; | |
3011 | } | |
3012 | ||
3013 | /* Advance from IP header to OSPF header (iph->ip_hl has been verified | |
3014 | by ospf_recv_packet() to be correct). */ | |
3015 | stream_forward_getp(ibuf, iph->ip_hl * 4); | |
3016 | ||
2d34fb80 | 3017 | ospfh = (struct ospf_header *)stream_pnt(ibuf); |
d62a17ae | 3018 | if (MSG_OK |
9d303b37 DL |
3019 | != ospf_packet_examin( |
3020 | ospfh, stream_get_endp(ibuf) - stream_get_getp(ibuf))) | |
d62a17ae | 3021 | return -1; |
3022 | /* Now it is safe to access all fields of OSPF packet header. */ | |
3023 | ||
3024 | /* associate packet with ospf interface */ | |
3025 | oi = ospf_if_lookup_recv_if(ospf, iph->ip_src, ifp); | |
3026 | ||
3027 | /* ospf_verify_header() relies on a valid "oi" and thus can be called | |
3028 | only | |
3029 | after the passive/backbone/other checks below are passed. These | |
3030 | checks | |
3031 | in turn access the fields of unverified "ospfh" structure for their | |
3032 | own | |
3033 | purposes and must remain very accurate in doing this. */ | |
3034 | ||
3035 | /* If incoming interface is passive one, ignore it. */ | |
3036 | if (oi && OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) { | |
3037 | char buf[3][INET_ADDRSTRLEN]; | |
3038 | ||
3039 | if (IS_DEBUG_OSPF_EVENT) | |
3040 | zlog_debug( | |
3041 | "ignoring packet from router %s sent to %s, " | |
3042 | "received on a passive interface, %s", | |
3043 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], | |
3044 | sizeof(buf[0])), | |
3045 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], | |
3046 | sizeof(buf[1])), | |
3047 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
3048 | buf[2], sizeof(buf[2]))); | |
3049 | ||
3050 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) { | |
3051 | /* Try to fix multicast membership. | |
3052 | * Some OS:es may have problems in this area, | |
3053 | * make sure it is removed. | |
3054 | */ | |
3055 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
3056 | ospf_if_set_multicast(oi); | |
3057 | } | |
3058 | return 0; | |
3059 | } | |
3060 | ||
3061 | ||
3062 | /* if no local ospf_interface, | |
3063 | * or header area is backbone but ospf_interface is not | |
3064 | * check for VLINK interface | |
3065 | */ | |
9d303b37 DL |
3066 | if ((oi == NULL) || (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) |
3067 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id))) { | |
d62a17ae | 3068 | if ((oi = ospf_associate_packet_vl(ospf, ifp, iph, ospfh)) |
3069 | == NULL) { | |
3070 | if (!ospf->instance && IS_DEBUG_OSPF_EVENT) | |
3071 | zlog_debug( | |
3072 | "Packet from [%s] received on link %s" | |
3073 | " but no ospf_interface", | |
3074 | inet_ntoa(iph->ip_src), ifp->name); | |
3075 | return 0; | |
3076 | } | |
3077 | } | |
3078 | ||
3079 | /* else it must be a local ospf interface, check it was received on | |
3080 | * correct link | |
3081 | */ | |
3082 | else if (oi->ifp != ifp) { | |
3083 | if (IS_DEBUG_OSPF_EVENT) | |
cf444bcf | 3084 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 3085 | "Packet from [%s] received on wrong link %s", |
d62a17ae | 3086 | inet_ntoa(iph->ip_src), ifp->name); |
3087 | return 0; | |
3088 | } else if (oi->state == ISM_Down) { | |
3089 | char buf[2][INET_ADDRSTRLEN]; | |
c9cc11f6 | 3090 | flog_warn( |
cf444bcf | 3091 | EC_OSPF_PACKET, |
d62a17ae | 3092 | "Ignoring packet from %s to %s received on interface that is " |
3093 | "down [%s]; interface flags are %s", | |
3094 | inet_ntop(AF_INET, &iph->ip_src, buf[0], | |
3095 | sizeof(buf[0])), | |
3096 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], | |
3097 | sizeof(buf[1])), | |
3098 | ifp->name, if_flag_dump(ifp->flags)); | |
3099 | /* Fix multicast memberships? */ | |
3100 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
3101 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
3102 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) | |
3103 | OI_MEMBER_JOINED(oi, MEMBER_DROUTERS); | |
3104 | if (oi->multicast_memberships) | |
3105 | ospf_if_set_multicast(oi); | |
3106 | return 0; | |
3107 | } | |
3108 | ||
3109 | /* | |
3110 | * If the received packet is destined for AllDRouters, the packet | |
3111 | * should be accepted only if the received ospf interface state is | |
3112 | * either DR or Backup -- endo. | |
3113 | */ | |
3114 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS) | |
3115 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) { | |
c9cc11f6 | 3116 | flog_warn( |
cf444bcf | 3117 | EC_OSPF_PACKET, |
d62a17ae | 3118 | "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", |
3119 | inet_ntoa(iph->ip_src), IF_NAME(oi), | |
3120 | lookup_msg(ospf_ism_state_msg, oi->state, NULL)); | |
3121 | /* Try to fix multicast membership. */ | |
3122 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
3123 | ospf_if_set_multicast(oi); | |
3124 | return 0; | |
3125 | } | |
3126 | ||
3127 | /* Verify more OSPF header fields. */ | |
3128 | ret = ospf_verify_header(ibuf, oi, iph, ospfh); | |
3129 | if (ret < 0) { | |
3130 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
3131 | zlog_debug( | |
3132 | "ospf_read[%s]: Header check failed, " | |
3133 | "dropping.", | |
3134 | inet_ntoa(iph->ip_src)); | |
3135 | return ret; | |
3136 | } | |
3137 | ||
3138 | /* Show debug receiving packet. */ | |
3139 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) { | |
3140 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, DETAIL)) { | |
3141 | zlog_debug( | |
3142 | "-----------------------------------------------------"); | |
3143 | ospf_packet_dump(ibuf); | |
3144 | } | |
3145 | ||
3146 | zlog_debug("%s received from [%s] via [%s]", | |
3147 | lookup_msg(ospf_packet_type_str, ospfh->type, NULL), | |
3148 | inet_ntoa(ospfh->router_id), IF_NAME(oi)); | |
3149 | zlog_debug(" src [%s],", inet_ntoa(iph->ip_src)); | |
3150 | zlog_debug(" dst [%s]", inet_ntoa(iph->ip_dst)); | |
3151 | ||
3152 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, DETAIL)) | |
3153 | zlog_debug( | |
3154 | "-----------------------------------------------------"); | |
3155 | } | |
3156 | ||
3157 | stream_forward_getp(ibuf, OSPF_HEADER_SIZE); | |
3158 | ||
3159 | /* Adjust size to message length. */ | |
3160 | length = ntohs(ospfh->length) - OSPF_HEADER_SIZE; | |
3161 | ||
3162 | /* Read rest of the packet and call each sort of packet routine. */ | |
3163 | switch (ospfh->type) { | |
3164 | case OSPF_MSG_HELLO: | |
3165 | ospf_hello(iph, ospfh, ibuf, oi, length); | |
3166 | break; | |
3167 | case OSPF_MSG_DB_DESC: | |
3168 | ospf_db_desc(iph, ospfh, ibuf, oi, length); | |
3169 | break; | |
3170 | case OSPF_MSG_LS_REQ: | |
3171 | ospf_ls_req(iph, ospfh, ibuf, oi, length); | |
3172 | break; | |
3173 | case OSPF_MSG_LS_UPD: | |
3174 | ospf_ls_upd(ospf, iph, ospfh, ibuf, oi, length); | |
3175 | break; | |
3176 | case OSPF_MSG_LS_ACK: | |
3177 | ospf_ls_ack(iph, ospfh, ibuf, oi, length); | |
3178 | break; | |
3179 | default: | |
cf444bcf | 3180 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 3181 | "interface %s: OSPF packet header type %d is illegal", |
d62a17ae | 3182 | IF_NAME(oi), ospfh->type); |
3183 | break; | |
3184 | } | |
3185 | ||
b10ce841 | 3186 | return 0; |
718e3744 | 3187 | } |
3188 | ||
3189 | /* Make OSPF header. */ | |
d62a17ae | 3190 | static void ospf_make_header(int type, struct ospf_interface *oi, |
3191 | struct stream *s) | |
718e3744 | 3192 | { |
d62a17ae | 3193 | struct ospf_header *ospfh; |
718e3744 | 3194 | |
d62a17ae | 3195 | ospfh = (struct ospf_header *)STREAM_DATA(s); |
718e3744 | 3196 | |
d7c0a89a QY |
3197 | ospfh->version = (uint8_t)OSPF_VERSION; |
3198 | ospfh->type = (uint8_t)type; | |
718e3744 | 3199 | |
d62a17ae | 3200 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 3201 | |
d62a17ae | 3202 | ospfh->checksum = 0; |
3203 | ospfh->area_id = oi->area->area_id; | |
3204 | ospfh->auth_type = htons(ospf_auth_type(oi)); | |
718e3744 | 3205 | |
d62a17ae | 3206 | memset(ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); |
718e3744 | 3207 | |
d62a17ae | 3208 | stream_forward_endp(s, OSPF_HEADER_SIZE); |
718e3744 | 3209 | } |
3210 | ||
3211 | /* Make Authentication Data. */ | |
d62a17ae | 3212 | static int ospf_make_auth(struct ospf_interface *oi, struct ospf_header *ospfh) |
3213 | { | |
3214 | struct crypt_key *ck; | |
3215 | ||
3216 | switch (ospf_auth_type(oi)) { | |
3217 | case OSPF_AUTH_NULL: | |
3218 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); | |
3219 | */ | |
3220 | break; | |
3221 | case OSPF_AUTH_SIMPLE: | |
3222 | memcpy(ospfh->u.auth_data, OSPF_IF_PARAM(oi, auth_simple), | |
3223 | OSPF_AUTH_SIMPLE_SIZE); | |
3224 | break; | |
3225 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
3226 | /* If key is not set, then set 0. */ | |
3227 | if (list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) { | |
3228 | ospfh->u.crypt.zero = 0; | |
3229 | ospfh->u.crypt.key_id = 0; | |
3230 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3231 | } else { | |
3232 | ck = listgetdata( | |
3233 | listtail(OSPF_IF_PARAM(oi, auth_crypt))); | |
3234 | ospfh->u.crypt.zero = 0; | |
3235 | ospfh->u.crypt.key_id = ck->key_id; | |
3236 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3237 | } | |
3238 | /* note: the seq is done in ospf_make_md5_digest() */ | |
3239 | break; | |
3240 | default: | |
3241 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); | |
3242 | */ | |
3243 | break; | |
718e3744 | 3244 | } |
718e3744 | 3245 | |
d62a17ae | 3246 | return 0; |
718e3744 | 3247 | } |
3248 | ||
3249 | /* Fill rest of OSPF header. */ | |
d62a17ae | 3250 | static void ospf_fill_header(struct ospf_interface *oi, struct stream *s, |
d7c0a89a | 3251 | uint16_t length) |
d62a17ae | 3252 | { |
3253 | struct ospf_header *ospfh; | |
3254 | ||
3255 | ospfh = (struct ospf_header *)STREAM_DATA(s); | |
3256 | ||
3257 | /* Fill length. */ | |
3258 | ospfh->length = htons(length); | |
3259 | ||
3260 | /* Calculate checksum. */ | |
3261 | if (ntohs(ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
3262 | ospfh->checksum = in_cksum(ospfh, length); | |
3263 | else | |
3264 | ospfh->checksum = 0; | |
3265 | ||
3266 | /* Add Authentication Data. */ | |
3267 | ospf_make_auth(oi, ospfh); | |
3268 | } | |
3269 | ||
3270 | static int ospf_make_hello(struct ospf_interface *oi, struct stream *s) | |
3271 | { | |
3272 | struct ospf_neighbor *nbr; | |
3273 | struct route_node *rn; | |
d7c0a89a | 3274 | uint16_t length = OSPF_HELLO_MIN_SIZE; |
d62a17ae | 3275 | struct in_addr mask; |
3276 | unsigned long p; | |
3277 | int flag = 0; | |
3278 | ||
3279 | /* Set netmask of interface. */ | |
3280 | if (!(CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED) | |
3281 | && oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3282 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
3283 | masklen2ip(oi->address->prefixlen, &mask); | |
3284 | else | |
3285 | memset((char *)&mask, 0, sizeof(struct in_addr)); | |
3286 | stream_put_ipv4(s, mask.s_addr); | |
3287 | ||
3288 | /* Set Hello Interval. */ | |
3289 | if (OSPF_IF_PARAM(oi, fast_hello) == 0) | |
3290 | stream_putw(s, OSPF_IF_PARAM(oi, v_hello)); | |
3291 | else | |
3292 | stream_putw(s, 0); /* hello-interval of 0 for fast-hellos */ | |
3293 | ||
3294 | if (IS_DEBUG_OSPF_EVENT) | |
3295 | zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi), | |
3296 | IF_NAME(oi)); | |
3297 | ||
3298 | /* Set Options. */ | |
3299 | stream_putc(s, OPTIONS(oi)); | |
3300 | ||
3301 | /* Set Router Priority. */ | |
3302 | stream_putc(s, PRIORITY(oi)); | |
3303 | ||
3304 | /* Set Router Dead Interval. */ | |
3305 | stream_putl(s, OSPF_IF_PARAM(oi, v_wait)); | |
3306 | ||
3307 | /* Set Designated Router. */ | |
3308 | stream_put_ipv4(s, DR(oi).s_addr); | |
3309 | ||
3310 | p = stream_get_endp(s); | |
3311 | ||
3312 | /* Set Backup Designated Router. */ | |
3313 | stream_put_ipv4(s, BDR(oi).s_addr); | |
3314 | ||
3315 | /* Add neighbor seen. */ | |
3316 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3317 | if ((nbr = rn->info)) | |
3318 | if (nbr->router_id.s_addr | |
3319 | != 0) /* Ignore 0.0.0.0 node. */ | |
3320 | if (nbr->state | |
3321 | != NSM_Attempt) /* Ignore Down neighbor. */ | |
3322 | if (nbr->state | |
3323 | != NSM_Down) /* This is myself for | |
3324 | DR election. */ | |
3325 | if (!IPV4_ADDR_SAME( | |
3326 | &nbr->router_id, | |
3327 | &oi->ospf->router_id)) { | |
3328 | /* Check neighbor is | |
3329 | * sane? */ | |
3330 | if (nbr->d_router.s_addr | |
3331 | != 0 | |
3332 | && IPV4_ADDR_SAME( | |
3333 | &nbr->d_router, | |
3334 | &oi->address | |
3335 | ->u | |
3336 | .prefix4) | |
3337 | && IPV4_ADDR_SAME( | |
3338 | &nbr->bd_router, | |
3339 | &oi->address | |
3340 | ->u | |
3341 | .prefix4)) | |
3342 | flag = 1; | |
3343 | ||
9b18d58e NS |
3344 | /* Hello packet overflows interface MTU. */ |
3345 | if (length + sizeof(uint32_t) | |
3346 | > ospf_packet_max(oi)) { | |
3347 | flog_err( | |
3348 | EC_OSPF_LARGE_HELLO, | |
c531be7c | 3349 | "Oversized Hello packet! Larger than MTU. Not sending it out"); |
9b18d58e NS |
3350 | return 0; |
3351 | } | |
3352 | ||
d62a17ae | 3353 | stream_put_ipv4( |
3354 | s, | |
3355 | nbr->router_id | |
3356 | .s_addr); | |
3357 | length += 4; | |
3358 | } | |
3359 | ||
3360 | /* Let neighbor generate BackupSeen. */ | |
3361 | if (flag == 1) | |
3362 | stream_putl_at(s, p, 0); /* ipv4 address, normally */ | |
3363 | ||
3364 | return length; | |
3365 | } | |
3366 | ||
3367 | static int ospf_make_db_desc(struct ospf_interface *oi, | |
3368 | struct ospf_neighbor *nbr, struct stream *s) | |
3369 | { | |
3370 | struct ospf_lsa *lsa; | |
d7c0a89a QY |
3371 | uint16_t length = OSPF_DB_DESC_MIN_SIZE; |
3372 | uint8_t options; | |
d62a17ae | 3373 | unsigned long pp; |
3374 | int i; | |
3375 | struct ospf_lsdb *lsdb; | |
3376 | ||
3377 | /* Set Interface MTU. */ | |
3378 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3379 | stream_putw(s, 0); | |
3380 | else | |
3381 | stream_putw(s, oi->ifp->mtu); | |
3382 | ||
3383 | /* Set Options. */ | |
3384 | options = OPTIONS(oi); | |
3385 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) | |
3386 | SET_FLAG(options, OSPF_OPTION_O); | |
3387 | stream_putc(s, options); | |
3388 | ||
3389 | /* DD flags */ | |
3390 | pp = stream_get_endp(s); | |
3391 | stream_putc(s, nbr->dd_flags); | |
3392 | ||
3393 | /* Set DD Sequence Number. */ | |
3394 | stream_putl(s, nbr->dd_seqnum); | |
3395 | ||
3396 | /* shortcut unneeded walk of (empty) summary LSDBs */ | |
3397 | if (ospf_db_summary_isempty(nbr)) | |
3398 | goto empty; | |
3399 | ||
3400 | /* Describe LSA Header from Database Summary List. */ | |
3401 | lsdb = &nbr->db_sum; | |
3402 | ||
3403 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { | |
3404 | struct route_table *table = lsdb->type[i].db; | |
3405 | struct route_node *rn; | |
3406 | ||
3407 | for (rn = route_top(table); rn; rn = route_next(rn)) | |
3408 | if ((lsa = rn->info) != NULL) { | |
3409 | if (IS_OPAQUE_LSA(lsa->data->type) | |
3410 | && (!CHECK_FLAG(options, OSPF_OPTION_O))) { | |
3411 | /* Suppress advertising | |
0437e105 | 3412 | * opaque-information. */ |
d62a17ae | 3413 | /* Remove LSA from DB summary list. */ |
3414 | ospf_lsdb_delete(lsdb, lsa); | |
3415 | continue; | |
3416 | } | |
3417 | ||
3418 | if (!CHECK_FLAG(lsa->flags, OSPF_LSA_DISCARD)) { | |
3419 | struct lsa_header *lsah; | |
d7c0a89a | 3420 | uint16_t ls_age; |
d62a17ae | 3421 | |
3422 | /* DD packet overflows interface MTU. */ | |
3423 | if (length + OSPF_LSA_HEADER_SIZE | |
3424 | > ospf_packet_max(oi)) | |
3425 | break; | |
3426 | ||
3427 | /* Keep pointer to LS age. */ | |
3428 | lsah = (struct lsa_header | |
3429 | *)(STREAM_DATA(s) | |
3430 | + stream_get_endp( | |
3431 | s)); | |
3432 | ||
3433 | /* Proceed stream pointer. */ | |
3434 | stream_put(s, lsa->data, | |
3435 | OSPF_LSA_HEADER_SIZE); | |
3436 | length += OSPF_LSA_HEADER_SIZE; | |
3437 | ||
3438 | /* Set LS age. */ | |
3439 | ls_age = LS_AGE(lsa); | |
3440 | lsah->ls_age = htons(ls_age); | |
3441 | } | |
3442 | ||
3443 | /* Remove LSA from DB summary list. */ | |
3444 | ospf_lsdb_delete(lsdb, lsa); | |
3445 | } | |
3446 | } | |
718e3744 | 3447 | |
d62a17ae | 3448 | /* Update 'More' bit */ |
3449 | if (ospf_db_summary_isempty(nbr)) { | |
3450 | empty: | |
3451 | if (nbr->state >= NSM_Exchange) { | |
3452 | UNSET_FLAG(nbr->dd_flags, OSPF_DD_FLAG_M); | |
3453 | /* Rewrite DD flags */ | |
3454 | stream_putc_at(s, pp, nbr->dd_flags); | |
3455 | } else { | |
3456 | assert(IS_SET_DD_M(nbr->dd_flags)); | |
3457 | } | |
3458 | } | |
3459 | return length; | |
3460 | } | |
86f1fd96 | 3461 | |
d7c0a89a | 3462 | static int ospf_make_ls_req_func(struct stream *s, uint16_t *length, |
d62a17ae | 3463 | unsigned long delta, struct ospf_neighbor *nbr, |
3464 | struct ospf_lsa *lsa) | |
3465 | { | |
3466 | struct ospf_interface *oi; | |
718e3744 | 3467 | |
d62a17ae | 3468 | oi = nbr->oi; |
718e3744 | 3469 | |
9570f737 S |
3470 | /* LS Request packet overflows interface MTU |
3471 | * delta is just number of bytes required for 1 LS Req | |
3472 | * ospf_packet_max will return the number of bytes can | |
3473 | * be accomodated without ospf header. So length+delta | |
3474 | * can be compared to ospf_packet_max | |
3475 | * to check if it can fit another lsreq in the same packet. | |
3476 | */ | |
3477 | ||
d62a17ae | 3478 | if (*length + delta > ospf_packet_max(oi)) |
3479 | return 0; | |
1eb8ef25 | 3480 | |
d62a17ae | 3481 | stream_putl(s, lsa->data->type); |
3482 | stream_put_ipv4(s, lsa->data->id.s_addr); | |
3483 | stream_put_ipv4(s, lsa->data->adv_router.s_addr); | |
718e3744 | 3484 | |
d62a17ae | 3485 | ospf_lsa_unlock(&nbr->ls_req_last); |
3486 | nbr->ls_req_last = ospf_lsa_lock(lsa); | |
59ea14c6 | 3487 | |
d62a17ae | 3488 | *length += 12; |
3489 | return 1; | |
3490 | } | |
718e3744 | 3491 | |
d62a17ae | 3492 | static int ospf_make_ls_req(struct ospf_neighbor *nbr, struct stream *s) |
3493 | { | |
3494 | struct ospf_lsa *lsa; | |
d7c0a89a | 3495 | uint16_t length = OSPF_LS_REQ_MIN_SIZE; |
9570f737 | 3496 | unsigned long delta = 12; |
d62a17ae | 3497 | struct route_table *table; |
3498 | struct route_node *rn; | |
3499 | int i; | |
3500 | struct ospf_lsdb *lsdb; | |
718e3744 | 3501 | |
d62a17ae | 3502 | lsdb = &nbr->ls_req; |
718e3744 | 3503 | |
d62a17ae | 3504 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { |
3505 | table = lsdb->type[i].db; | |
3506 | for (rn = route_top(table); rn; rn = route_next(rn)) | |
3507 | if ((lsa = (rn->info)) != NULL) | |
3508 | if (ospf_make_ls_req_func(s, &length, delta, | |
3509 | nbr, lsa) | |
3510 | == 0) { | |
3511 | route_unlock_node(rn); | |
3512 | break; | |
3513 | } | |
3514 | } | |
3515 | return length; | |
3516 | } | |
718e3744 | 3517 | |
d62a17ae | 3518 | static int ls_age_increment(struct ospf_lsa *lsa, int delay) |
3519 | { | |
3520 | int age; | |
718e3744 | 3521 | |
d62a17ae | 3522 | age = IS_LSA_MAXAGE(lsa) ? OSPF_LSA_MAXAGE : LS_AGE(lsa) + delay; |
718e3744 | 3523 | |
d62a17ae | 3524 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); |
718e3744 | 3525 | } |
3526 | ||
d62a17ae | 3527 | static int ospf_make_ls_upd(struct ospf_interface *oi, struct list *update, |
3528 | struct stream *s) | |
718e3744 | 3529 | { |
d62a17ae | 3530 | struct ospf_lsa *lsa; |
3531 | struct listnode *node; | |
d7c0a89a | 3532 | uint16_t length = 0; |
d62a17ae | 3533 | unsigned int size_noauth; |
3534 | unsigned long delta = stream_get_endp(s); | |
3535 | unsigned long pp; | |
3536 | int count = 0; | |
3537 | ||
3538 | if (IS_DEBUG_OSPF_EVENT) | |
3539 | zlog_debug("ospf_make_ls_upd: Start"); | |
3540 | ||
3541 | pp = stream_get_endp(s); | |
3542 | stream_forward_endp(s, OSPF_LS_UPD_MIN_SIZE); | |
3543 | length += OSPF_LS_UPD_MIN_SIZE; | |
3544 | ||
3545 | /* Calculate amount of packet usable for data. */ | |
3546 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
3547 | ||
3548 | while ((node = listhead(update)) != NULL) { | |
3549 | struct lsa_header *lsah; | |
d7c0a89a | 3550 | uint16_t ls_age; |
d62a17ae | 3551 | |
3552 | if (IS_DEBUG_OSPF_EVENT) | |
3553 | zlog_debug("ospf_make_ls_upd: List Iteration %d", | |
3554 | count); | |
3555 | ||
3556 | lsa = listgetdata(node); | |
3557 | ||
3558 | assert(lsa->data); | |
3559 | ||
9570f737 S |
3560 | /* Will it fit? Minimum it has to fit atleast one */ |
3561 | if ((length + delta + ntohs(lsa->data->length) > size_noauth) && | |
3562 | (count > 0)) | |
d62a17ae | 3563 | break; |
3564 | ||
3565 | /* Keep pointer to LS age. */ | |
3566 | lsah = (struct lsa_header *)(STREAM_DATA(s) | |
3567 | + stream_get_endp(s)); | |
3568 | ||
3569 | /* Put LSA to Link State Request. */ | |
3570 | stream_put(s, lsa->data, ntohs(lsa->data->length)); | |
718e3744 | 3571 | |
d62a17ae | 3572 | /* Set LS age. */ |
3573 | /* each hop must increment an lsa_age by transmit_delay | |
3574 | of OSPF interface */ | |
3575 | ls_age = ls_age_increment(lsa, | |
3576 | OSPF_IF_PARAM(oi, transmit_delay)); | |
3577 | lsah->ls_age = htons(ls_age); | |
3578 | ||
3579 | length += ntohs(lsa->data->length); | |
3580 | count++; | |
3581 | ||
3582 | list_delete_node(update, node); | |
3583 | ospf_lsa_unlock(&lsa); /* oi->ls_upd_queue */ | |
3584 | } | |
3585 | ||
3586 | /* Now set #LSAs. */ | |
3587 | stream_putl_at(s, pp, count); | |
3588 | ||
3589 | if (IS_DEBUG_OSPF_EVENT) | |
3590 | zlog_debug("ospf_make_ls_upd: Stop"); | |
3591 | return length; | |
718e3744 | 3592 | } |
3593 | ||
d62a17ae | 3594 | static int ospf_make_ls_ack(struct ospf_interface *oi, struct list *ack, |
3595 | struct stream *s) | |
718e3744 | 3596 | { |
d62a17ae | 3597 | struct listnode *node, *nnode; |
d7c0a89a | 3598 | uint16_t length = OSPF_LS_ACK_MIN_SIZE; |
9570f737 | 3599 | unsigned long delta = OSPF_LSA_HEADER_SIZE; |
d62a17ae | 3600 | struct ospf_lsa *lsa; |
718e3744 | 3601 | |
d62a17ae | 3602 | for (ALL_LIST_ELEMENTS(ack, node, nnode, lsa)) { |
3603 | assert(lsa); | |
718e3744 | 3604 | |
9570f737 S |
3605 | /* LS Ack packet overflows interface MTU |
3606 | * delta is just number of bytes required for | |
3607 | * 1 LS Ack(1 LS Hdr) ospf_packet_max will return | |
3608 | * the number of bytes can be accomodated without | |
3609 | * ospf header. So length+delta can be compared | |
3610 | * against ospf_packet_max to check if it can fit | |
3611 | * another ls header in the same packet. | |
3612 | */ | |
3613 | if ((length + delta) > ospf_packet_max(oi)) | |
d62a17ae | 3614 | break; |
718e3744 | 3615 | |
d62a17ae | 3616 | stream_put(s, lsa->data, OSPF_LSA_HEADER_SIZE); |
3617 | length += OSPF_LSA_HEADER_SIZE; | |
3618 | ||
3619 | listnode_delete(ack, lsa); | |
3620 | ospf_lsa_unlock(&lsa); /* oi->ls_ack_direct.ls_ack */ | |
3621 | } | |
3622 | ||
3623 | return length; | |
3624 | } | |
3625 | ||
3626 | static void ospf_hello_send_sub(struct ospf_interface *oi, in_addr_t addr) | |
3627 | { | |
3628 | struct ospf_packet *op; | |
d7c0a89a | 3629 | uint16_t length = OSPF_HEADER_SIZE; |
718e3744 | 3630 | |
d62a17ae | 3631 | op = ospf_packet_new(oi->ifp->mtu); |
718e3744 | 3632 | |
d62a17ae | 3633 | /* Prepare OSPF common header. */ |
3634 | ospf_make_header(OSPF_MSG_HELLO, oi, op->s); | |
718e3744 | 3635 | |
d62a17ae | 3636 | /* Prepare OSPF Hello body. */ |
3637 | length += ospf_make_hello(oi, op->s); | |
9b18d58e NS |
3638 | if (length == OSPF_HEADER_SIZE) { |
3639 | /* Hello overshooting MTU */ | |
3640 | ospf_packet_free(op); | |
3641 | return; | |
3642 | } | |
718e3744 | 3643 | |
d62a17ae | 3644 | /* Fill OSPF header. */ |
3645 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3646 | |
d62a17ae | 3647 | /* Set packet length. */ |
3648 | op->length = length; | |
3649 | ||
3650 | op->dst.s_addr = addr; | |
3651 | ||
b5a8894d CS |
3652 | if (IS_DEBUG_OSPF_EVENT) { |
3653 | if (oi->ospf->vrf_id) | |
996c9314 LB |
3654 | zlog_debug( |
3655 | "%s: Hello Tx interface %s ospf vrf %s id %u", | |
3656 | __PRETTY_FUNCTION__, oi->ifp->name, | |
3657 | ospf_vrf_id_to_name(oi->ospf->vrf_id), | |
3658 | oi->ospf->vrf_id); | |
b5a8894d | 3659 | } |
d62a17ae | 3660 | /* Add packet to the top of the interface output queue, so that they |
3661 | * can't get delayed by things like long queues of LS Update packets | |
3662 | */ | |
3663 | ospf_packet_add_top(oi, op); | |
3664 | ||
3665 | /* Hook thread to write packet. */ | |
3666 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3667 | } |
3668 | ||
d62a17ae | 3669 | static void ospf_poll_send(struct ospf_nbr_nbma *nbr_nbma) |
718e3744 | 3670 | { |
d62a17ae | 3671 | struct ospf_interface *oi; |
718e3744 | 3672 | |
d62a17ae | 3673 | oi = nbr_nbma->oi; |
3674 | assert(oi); | |
718e3744 | 3675 | |
d62a17ae | 3676 | /* If this is passive interface, do not send OSPF Hello. */ |
3677 | if (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) | |
3678 | return; | |
718e3744 | 3679 | |
d62a17ae | 3680 | if (oi->type != OSPF_IFTYPE_NBMA) |
3681 | return; | |
718e3744 | 3682 | |
d62a17ae | 3683 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) |
3684 | return; | |
718e3744 | 3685 | |
d62a17ae | 3686 | if (PRIORITY(oi) == 0) |
3687 | return; | |
718e3744 | 3688 | |
d62a17ae | 3689 | if (nbr_nbma->priority == 0 && oi->state != ISM_DR |
3690 | && oi->state != ISM_Backup) | |
3691 | return; | |
718e3744 | 3692 | |
d62a17ae | 3693 | ospf_hello_send_sub(oi, nbr_nbma->addr.s_addr); |
718e3744 | 3694 | } |
3695 | ||
d62a17ae | 3696 | int ospf_poll_timer(struct thread *thread) |
718e3744 | 3697 | { |
d62a17ae | 3698 | struct ospf_nbr_nbma *nbr_nbma; |
718e3744 | 3699 | |
d62a17ae | 3700 | nbr_nbma = THREAD_ARG(thread); |
3701 | nbr_nbma->t_poll = NULL; | |
718e3744 | 3702 | |
d62a17ae | 3703 | if (IS_DEBUG_OSPF(nsm, NSM_TIMERS)) |
3704 | zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)", | |
3705 | IF_NAME(nbr_nbma->oi), inet_ntoa(nbr_nbma->addr)); | |
718e3744 | 3706 | |
d62a17ae | 3707 | ospf_poll_send(nbr_nbma); |
718e3744 | 3708 | |
d62a17ae | 3709 | if (nbr_nbma->v_poll > 0) |
3710 | OSPF_POLL_TIMER_ON(nbr_nbma->t_poll, ospf_poll_timer, | |
3711 | nbr_nbma->v_poll); | |
718e3744 | 3712 | |
d62a17ae | 3713 | return 0; |
718e3744 | 3714 | } |
3715 | ||
3716 | ||
d62a17ae | 3717 | int ospf_hello_reply_timer(struct thread *thread) |
718e3744 | 3718 | { |
d62a17ae | 3719 | struct ospf_neighbor *nbr; |
718e3744 | 3720 | |
d62a17ae | 3721 | nbr = THREAD_ARG(thread); |
3722 | nbr->t_hello_reply = NULL; | |
718e3744 | 3723 | |
d62a17ae | 3724 | assert(nbr->oi); |
718e3744 | 3725 | |
d62a17ae | 3726 | if (IS_DEBUG_OSPF(nsm, NSM_TIMERS)) |
3727 | zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)", | |
3728 | IF_NAME(nbr->oi), inet_ntoa(nbr->router_id)); | |
718e3744 | 3729 | |
d62a17ae | 3730 | ospf_hello_send_sub(nbr->oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3731 | |
d62a17ae | 3732 | return 0; |
718e3744 | 3733 | } |
3734 | ||
3735 | /* Send OSPF Hello. */ | |
d62a17ae | 3736 | void ospf_hello_send(struct ospf_interface *oi) |
3737 | { | |
3738 | /* If this is passive interface, do not send OSPF Hello. */ | |
3739 | if (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) | |
3740 | return; | |
3741 | ||
3742 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
3743 | struct ospf_neighbor *nbr; | |
3744 | struct route_node *rn; | |
3745 | ||
3746 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3747 | if ((nbr = rn->info)) | |
3748 | if (nbr != oi->nbr_self) | |
3749 | if (nbr->state != NSM_Down) { | |
3750 | /* RFC 2328 Section 9.5.1 | |
3751 | If the router is not | |
3752 | eligible to become Designated | |
3753 | Router, | |
3754 | it must periodically send | |
3755 | Hello Packets to both the | |
3756 | Designated Router and the | |
3757 | Backup Designated Router (if | |
3758 | they | |
3759 | exist). */ | |
3760 | if (PRIORITY(oi) == 0 | |
3761 | && IPV4_ADDR_CMP( | |
3762 | &DR(oi), | |
3763 | &nbr->address.u | |
3764 | .prefix4) | |
3765 | && IPV4_ADDR_CMP( | |
3766 | &BDR(oi), | |
3767 | &nbr->address.u | |
3768 | .prefix4)) | |
3769 | continue; | |
3770 | ||
3771 | /* If the router is eligible to | |
3772 | become Designated Router, it | |
3773 | must periodically send Hello | |
3774 | Packets to all neighbors that | |
3775 | are also eligible. In | |
3776 | addition, if the router is | |
3777 | itself the | |
3778 | Designated Router or Backup | |
3779 | Designated Router, it must | |
3780 | also | |
3781 | send periodic Hello Packets | |
3782 | to all other neighbors. */ | |
3783 | ||
3784 | if (nbr->priority == 0 | |
3785 | && oi->state == ISM_DROther) | |
3786 | continue; | |
3787 | /* if oi->state == Waiting, send | |
3788 | * hello to all neighbors */ | |
3789 | ospf_hello_send_sub( | |
3790 | oi, | |
3791 | nbr->address.u.prefix4 | |
3792 | .s_addr); | |
3793 | } | |
3794 | } else { | |
3795 | /* Decide destination address. */ | |
3796 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3797 | ospf_hello_send_sub(oi, oi->vl_data->peer_addr.s_addr); | |
3798 | else | |
3799 | ospf_hello_send_sub(oi, htonl(OSPF_ALLSPFROUTERS)); | |
3800 | } | |
718e3744 | 3801 | } |
3802 | ||
3803 | /* Send OSPF Database Description. */ | |
d62a17ae | 3804 | void ospf_db_desc_send(struct ospf_neighbor *nbr) |
718e3744 | 3805 | { |
d62a17ae | 3806 | struct ospf_interface *oi; |
3807 | struct ospf_packet *op; | |
d7c0a89a | 3808 | uint16_t length = OSPF_HEADER_SIZE; |
718e3744 | 3809 | |
d62a17ae | 3810 | oi = nbr->oi; |
3811 | op = ospf_packet_new(oi->ifp->mtu); | |
718e3744 | 3812 | |
d62a17ae | 3813 | /* Prepare OSPF common header. */ |
3814 | ospf_make_header(OSPF_MSG_DB_DESC, oi, op->s); | |
718e3744 | 3815 | |
d62a17ae | 3816 | /* Prepare OSPF Database Description body. */ |
3817 | length += ospf_make_db_desc(oi, nbr, op->s); | |
718e3744 | 3818 | |
d62a17ae | 3819 | /* Fill OSPF header. */ |
3820 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3821 | |
d62a17ae | 3822 | /* Set packet length. */ |
3823 | op->length = length; | |
718e3744 | 3824 | |
d62a17ae | 3825 | /* Decide destination address. */ |
3826 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3827 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3828 | else | |
3829 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3830 | |
d62a17ae | 3831 | /* Add packet to the interface output queue. */ |
3832 | ospf_packet_add(oi, op); | |
718e3744 | 3833 | |
d62a17ae | 3834 | /* Hook thread to write packet. */ |
3835 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3836 | |
d62a17ae | 3837 | /* Remove old DD packet, then copy new one and keep in neighbor |
3838 | * structure. */ | |
3839 | if (nbr->last_send) | |
3840 | ospf_packet_free(nbr->last_send); | |
3841 | nbr->last_send = ospf_packet_dup(op); | |
3842 | monotime(&nbr->last_send_ts); | |
e6a22aeb SK |
3843 | if (CHECK_FLAG(oi->ospf->config, OSPF_LOG_ADJACENCY_DETAIL)) |
3844 | zlog_info( | |
3845 | "%s:Packet[DD]: %s DB Desc send with seqnum:%x , flags:%x", | |
3846 | (oi->ospf->name) ? oi->ospf->name : VRF_DEFAULT_NAME, | |
3847 | inet_ntoa(nbr->router_id), nbr->dd_seqnum, | |
3848 | nbr->dd_flags); | |
718e3744 | 3849 | } |
3850 | ||
3851 | /* Re-send Database Description. */ | |
d62a17ae | 3852 | void ospf_db_desc_resend(struct ospf_neighbor *nbr) |
718e3744 | 3853 | { |
d62a17ae | 3854 | struct ospf_interface *oi; |
718e3744 | 3855 | |
d62a17ae | 3856 | oi = nbr->oi; |
718e3744 | 3857 | |
d62a17ae | 3858 | /* Add packet to the interface output queue. */ |
3859 | ospf_packet_add(oi, ospf_packet_dup(nbr->last_send)); | |
718e3744 | 3860 | |
d62a17ae | 3861 | /* Hook thread to write packet. */ |
3862 | OSPF_ISM_WRITE_ON(oi->ospf); | |
e6a22aeb SK |
3863 | if (CHECK_FLAG(oi->ospf->config, OSPF_LOG_ADJACENCY_DETAIL)) |
3864 | zlog_info( | |
3865 | "%s:Packet[DD]: %s DB Desc resend with seqnum:%x , flags:%x", | |
3866 | (oi->ospf->name) ? oi->ospf->name : VRF_DEFAULT_NAME, | |
3867 | inet_ntoa(nbr->router_id), nbr->dd_seqnum, | |
3868 | nbr->dd_flags); | |
718e3744 | 3869 | } |
3870 | ||
3871 | /* Send Link State Request. */ | |
d62a17ae | 3872 | void ospf_ls_req_send(struct ospf_neighbor *nbr) |
718e3744 | 3873 | { |
d62a17ae | 3874 | struct ospf_interface *oi; |
3875 | struct ospf_packet *op; | |
d7c0a89a | 3876 | uint16_t length = OSPF_HEADER_SIZE; |
718e3744 | 3877 | |
d62a17ae | 3878 | oi = nbr->oi; |
3879 | op = ospf_packet_new(oi->ifp->mtu); | |
718e3744 | 3880 | |
d62a17ae | 3881 | /* Prepare OSPF common header. */ |
3882 | ospf_make_header(OSPF_MSG_LS_REQ, oi, op->s); | |
718e3744 | 3883 | |
d62a17ae | 3884 | /* Prepare OSPF Link State Request body. */ |
3885 | length += ospf_make_ls_req(nbr, op->s); | |
3886 | if (length == OSPF_HEADER_SIZE) { | |
3887 | ospf_packet_free(op); | |
3888 | return; | |
3889 | } | |
718e3744 | 3890 | |
d62a17ae | 3891 | /* Fill OSPF header. */ |
3892 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3893 | |
d62a17ae | 3894 | /* Set packet length. */ |
3895 | op->length = length; | |
718e3744 | 3896 | |
d62a17ae | 3897 | /* Decide destination address. */ |
3898 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3899 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3900 | else | |
3901 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3902 | |
d62a17ae | 3903 | /* Add packet to the interface output queue. */ |
3904 | ospf_packet_add(oi, op); | |
718e3744 | 3905 | |
d62a17ae | 3906 | /* Hook thread to write packet. */ |
3907 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3908 | |
d62a17ae | 3909 | /* Add Link State Request Retransmission Timer. */ |
3910 | OSPF_NSM_TIMER_ON(nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
718e3744 | 3911 | } |
3912 | ||
3913 | /* Send Link State Update with an LSA. */ | |
d62a17ae | 3914 | void ospf_ls_upd_send_lsa(struct ospf_neighbor *nbr, struct ospf_lsa *lsa, |
3915 | int flag) | |
718e3744 | 3916 | { |
d62a17ae | 3917 | struct list *update; |
718e3744 | 3918 | |
d62a17ae | 3919 | update = list_new(); |
718e3744 | 3920 | |
d62a17ae | 3921 | listnode_add(update, lsa); |
046460a1 CS |
3922 | |
3923 | /*ospf instance is going down, send self originated | |
3924 | * MAXAGE LSA update to neighbors to remove from LSDB */ | |
3925 | if (nbr->oi->ospf->inst_shutdown && IS_LSA_MAXAGE(lsa)) | |
3926 | ospf_ls_upd_send(nbr, update, flag, 1); | |
3927 | else | |
3928 | ospf_ls_upd_send(nbr, update, flag, 0); | |
718e3744 | 3929 | |
6a154c88 | 3930 | list_delete(&update); |
718e3744 | 3931 | } |
3932 | ||
68b7339a | 3933 | /* Determine size for packet. Must be at least big enough to accomodate next |
3934 | * LSA on list, which may be bigger than MTU size. | |
3935 | * | |
3936 | * Return pointer to new ospf_packet | |
3937 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3938 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3939 | */ | |
d62a17ae | 3940 | static struct ospf_packet *ospf_ls_upd_packet_new(struct list *update, |
3941 | struct ospf_interface *oi) | |
3942 | { | |
3943 | struct ospf_lsa *lsa; | |
3944 | struct listnode *ln; | |
3945 | size_t size; | |
3946 | static char warned = 0; | |
3947 | ||
3948 | lsa = listgetdata((ln = listhead(update))); | |
3949 | assert(lsa->data); | |
3950 | ||
3951 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs(lsa->data->length)) | |
3952 | > ospf_packet_max(oi)) { | |
3953 | if (!warned) { | |
c9cc11f6 | 3954 | flog_warn( |
cf444bcf | 3955 | EC_OSPF_LARGE_LSA, |
d62a17ae | 3956 | "ospf_ls_upd_packet_new: oversized LSA encountered!" |
3957 | "will need to fragment. Not optimal. Try divide up" | |
3958 | " your network with areas. Use 'debug ospf packet send'" | |
3959 | " to see details, or look at 'show ip ospf database ..'"); | |
3960 | warned = 1; | |
3961 | } | |
3962 | ||
3963 | if (IS_DEBUG_OSPF_PACKET(0, SEND)) | |
3964 | zlog_debug( | |
3965 | "ospf_ls_upd_packet_new: oversized LSA id:%s," | |
3966 | " %d bytes originated by %s, will be fragmented!", | |
3967 | inet_ntoa(lsa->data->id), | |
3968 | ntohs(lsa->data->length), | |
3969 | inet_ntoa(lsa->data->adv_router)); | |
3970 | ||
3971 | /* | |
3972 | * Allocate just enough to fit this LSA only, to avoid including | |
3973 | * other | |
3974 | * LSAs in fragmented LSA Updates. | |
3975 | */ | |
3976 | size = ntohs(lsa->data->length) | |
3977 | + (oi->ifp->mtu - ospf_packet_max(oi)) | |
3978 | + OSPF_LS_UPD_MIN_SIZE; | |
3979 | } else | |
3980 | size = oi->ifp->mtu; | |
3981 | ||
3982 | if (size > OSPF_MAX_PACKET_SIZE) { | |
cf444bcf | 3983 | flog_warn(EC_OSPF_LARGE_LSA, |
c9cc11f6 DS |
3984 | "ospf_ls_upd_packet_new: oversized LSA id:%s too big," |
3985 | " %d bytes, packet size %ld, dropping it completely." | |
3986 | " OSPF routing is broken!", | |
3987 | inet_ntoa(lsa->data->id), ntohs(lsa->data->length), | |
3988 | (long int)size); | |
d62a17ae | 3989 | list_delete_node(update, ln); |
3990 | return NULL; | |
3991 | } | |
718e3744 | 3992 | |
d62a17ae | 3993 | /* IP header is built up separately by ospf_write(). This means, that we |
3994 | * must | |
3995 | * reduce the "affordable" size just calculated by length of an IP | |
3996 | * header. | |
3997 | * This makes sure, that even if we manage to fill the payload with LSA | |
3998 | * data | |
3999 | * completely, the final packet (our data plus IP header) still fits | |
4000 | * into | |
4001 | * outgoing interface MTU. This correction isn't really meaningful for | |
4002 | * an | |
4003 | * oversized LSA, but for consistency the correction is done for both | |
4004 | * cases. | |
4005 | * | |
4006 | * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size | |
4007 | */ | |
4008 | return ospf_packet_new(size - sizeof(struct ip)); | |
718e3744 | 4009 | } |
4010 | ||
d62a17ae | 4011 | static void ospf_ls_upd_queue_send(struct ospf_interface *oi, |
046460a1 CS |
4012 | struct list *update, struct in_addr addr, |
4013 | int send_lsupd_now) | |
718e3744 | 4014 | { |
d62a17ae | 4015 | struct ospf_packet *op; |
d7c0a89a | 4016 | uint16_t length = OSPF_HEADER_SIZE; |
d62a17ae | 4017 | |
4018 | if (IS_DEBUG_OSPF_EVENT) | |
4019 | zlog_debug("listcount = %d, [%s]dst %s", listcount(update), | |
4020 | IF_NAME(oi), inet_ntoa(addr)); | |
4021 | ||
19274fe8 OD |
4022 | /* Check that we have really something to process */ |
4023 | if (listcount(update) == 0) | |
4024 | return; | |
4025 | ||
d62a17ae | 4026 | op = ospf_ls_upd_packet_new(update, oi); |
718e3744 | 4027 | |
d62a17ae | 4028 | /* Prepare OSPF common header. */ |
4029 | ospf_make_header(OSPF_MSG_LS_UPD, oi, op->s); | |
718e3744 | 4030 | |
d62a17ae | 4031 | /* Prepare OSPF Link State Update body. |
4032 | * Includes Type-7 translation. | |
4033 | */ | |
4034 | length += ospf_make_ls_upd(oi, update, op->s); | |
4035 | ||
4036 | /* Fill OSPF header. */ | |
4037 | ospf_fill_header(oi, op->s, length); | |
4038 | ||
4039 | /* Set packet length. */ | |
4040 | op->length = length; | |
4041 | ||
4042 | /* Decide destination address. */ | |
4043 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4044 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4045 | else | |
4046 | op->dst.s_addr = addr.s_addr; | |
4047 | ||
4048 | /* Add packet to the interface output queue. */ | |
4049 | ospf_packet_add(oi, op); | |
046460a1 CS |
4050 | /* Call ospf_write() right away to send ospf packets to neighbors */ |
4051 | if (send_lsupd_now) { | |
4052 | struct thread os_packet_thd; | |
4053 | ||
4054 | os_packet_thd.arg = (void *)oi->ospf; | |
4055 | if (oi->on_write_q == 0) { | |
4056 | listnode_add(oi->ospf->oi_write_q, oi); | |
4057 | oi->on_write_q = 1; | |
4058 | } | |
4059 | ospf_write(&os_packet_thd); | |
4173cc8e DS |
4060 | /* |
4061 | * We are fake calling ospf_write with a fake | |
4062 | * thread. Imagine that we have oi_a already | |
4063 | * enqueued and we have turned on the write | |
4064 | * thread(t_write). | |
4065 | * Now this function calls this for oi_b | |
4066 | * so the on_write_q has oi_a and oi_b on | |
4067 | * it, ospf_write runs and clears the packets | |
4068 | * for both oi_a and oi_b. Removing them from | |
4069 | * the on_write_q. After this thread of execution | |
4070 | * finishes we will execute the t_write thread | |
4071 | * with nothing in the on_write_q causing an | |
4072 | * assert. So just make sure that the t_write | |
4073 | * is actually turned off. | |
4074 | */ | |
4075 | if (list_isempty(oi->ospf->oi_write_q)) | |
4076 | OSPF_TIMER_OFF(oi->ospf->t_write); | |
046460a1 CS |
4077 | } else { |
4078 | /* Hook thread to write packet. */ | |
4079 | OSPF_ISM_WRITE_ON(oi->ospf); | |
4080 | } | |
d62a17ae | 4081 | } |
4082 | ||
4083 | static int ospf_ls_upd_send_queue_event(struct thread *thread) | |
4084 | { | |
4085 | struct ospf_interface *oi = THREAD_ARG(thread); | |
4086 | struct route_node *rn; | |
4087 | struct route_node *rnext; | |
4088 | struct list *update; | |
4089 | char again = 0; | |
4090 | ||
4091 | oi->t_ls_upd_event = NULL; | |
4092 | ||
4093 | if (IS_DEBUG_OSPF_EVENT) | |
4094 | zlog_debug("ospf_ls_upd_send_queue start"); | |
4095 | ||
4096 | for (rn = route_top(oi->ls_upd_queue); rn; rn = rnext) { | |
4097 | rnext = route_next(rn); | |
4098 | ||
4099 | if (rn->info == NULL) | |
4100 | continue; | |
4101 | ||
4102 | update = (struct list *)rn->info; | |
4103 | ||
046460a1 | 4104 | ospf_ls_upd_queue_send(oi, update, rn->p.u.prefix4, 0); |
d62a17ae | 4105 | |
4106 | /* list might not be empty. */ | |
4107 | if (listcount(update) == 0) { | |
6a154c88 | 4108 | list_delete((struct list **)&rn->info); |
d62a17ae | 4109 | route_unlock_node(rn); |
4110 | } else | |
4111 | again = 1; | |
4112 | } | |
4113 | ||
4114 | if (again != 0) { | |
4115 | if (IS_DEBUG_OSPF_EVENT) | |
4116 | zlog_debug( | |
4117 | "ospf_ls_upd_send_queue: update lists not cleared," | |
4118 | " %d nodes to try again, raising new event", | |
4119 | again); | |
4120 | oi->t_ls_upd_event = NULL; | |
4121 | thread_add_event(master, ospf_ls_upd_send_queue_event, oi, 0, | |
4122 | &oi->t_ls_upd_event); | |
4123 | } | |
4124 | ||
4125 | if (IS_DEBUG_OSPF_EVENT) | |
4126 | zlog_debug("ospf_ls_upd_send_queue stop"); | |
4127 | ||
4128 | return 0; | |
4129 | } | |
4130 | ||
046460a1 CS |
4131 | void ospf_ls_upd_send(struct ospf_neighbor *nbr, struct list *update, int flag, |
4132 | int send_lsupd_now) | |
d62a17ae | 4133 | { |
4134 | struct ospf_interface *oi; | |
4135 | struct ospf_lsa *lsa; | |
4136 | struct prefix_ipv4 p; | |
4137 | struct route_node *rn; | |
4138 | struct listnode *node; | |
4139 | ||
4140 | oi = nbr->oi; | |
4141 | ||
4142 | p.family = AF_INET; | |
4143 | p.prefixlen = IPV4_MAX_BITLEN; | |
4144 | ||
4145 | /* Decide destination address. */ | |
4146 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
4147 | p.prefix = oi->vl_data->peer_addr; | |
4148 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4149 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4150 | else if (flag == OSPF_SEND_PACKET_DIRECT) | |
4151 | p.prefix = nbr->address.u.prefix4; | |
4152 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
4153 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4154 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) | |
4155 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4156 | else | |
4157 | p.prefix.s_addr = htonl(OSPF_ALLDROUTERS); | |
4158 | ||
4159 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
4160 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
c9cc11f6 | 4161 | flog_warn( |
cf444bcf | 4162 | EC_OSPF_PACKET, |
d62a17ae | 4163 | "* LS-Update is directly sent on NBMA network."); |
19aad877 | 4164 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix)) |
cf444bcf | 4165 | flog_warn(EC_OSPF_PACKET, |
c9cc11f6 | 4166 | "* LS-Update is sent to myself."); |
d62a17ae | 4167 | } |
4168 | ||
4169 | rn = route_node_get(oi->ls_upd_queue, (struct prefix *)&p); | |
4170 | ||
4171 | if (rn->info == NULL) | |
4172 | rn->info = list_new(); | |
4173 | else | |
4174 | route_unlock_node(rn); | |
4175 | ||
4176 | for (ALL_LIST_ELEMENTS_RO(update, node, lsa)) | |
4177 | listnode_add(rn->info, | |
4178 | ospf_lsa_lock(lsa)); /* oi->ls_upd_queue */ | |
046460a1 CS |
4179 | if (send_lsupd_now) { |
4180 | struct list *send_update_list; | |
f7813c7c | 4181 | struct route_node *rnext; |
d62a17ae | 4182 | |
046460a1 CS |
4183 | for (rn = route_top(oi->ls_upd_queue); rn; rn = rnext) { |
4184 | rnext = route_next(rn); | |
4185 | ||
4186 | if (rn->info == NULL) | |
4187 | continue; | |
4188 | ||
4189 | send_update_list = (struct list *)rn->info; | |
4190 | ||
4191 | ospf_ls_upd_queue_send(oi, send_update_list, | |
4192 | rn->p.u.prefix4, 1); | |
046460a1 CS |
4193 | } |
4194 | } else | |
4195 | thread_add_event(master, ospf_ls_upd_send_queue_event, oi, 0, | |
996c9314 | 4196 | &oi->t_ls_upd_event); |
718e3744 | 4197 | } |
4198 | ||
d62a17ae | 4199 | static void ospf_ls_ack_send_list(struct ospf_interface *oi, struct list *ack, |
4200 | struct in_addr dst) | |
718e3744 | 4201 | { |
d62a17ae | 4202 | struct ospf_packet *op; |
d7c0a89a | 4203 | uint16_t length = OSPF_HEADER_SIZE; |
d62a17ae | 4204 | |
4205 | op = ospf_packet_new(oi->ifp->mtu); | |
4206 | ||
4207 | /* Prepare OSPF common header. */ | |
4208 | ospf_make_header(OSPF_MSG_LS_ACK, oi, op->s); | |
4209 | ||
4210 | /* Prepare OSPF Link State Acknowledgment body. */ | |
4211 | length += ospf_make_ls_ack(oi, ack, op->s); | |
4212 | ||
4213 | /* Fill OSPF header. */ | |
4214 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 4215 | |
d62a17ae | 4216 | /* Set packet length. */ |
4217 | op->length = length; | |
4218 | ||
4219 | /* Decide destination address. */ | |
4220 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4221 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4222 | else | |
4223 | op->dst.s_addr = dst.s_addr; | |
4224 | ||
4225 | /* Add packet to the interface output queue. */ | |
4226 | ospf_packet_add(oi, op); | |
4227 | ||
4228 | /* Hook thread to write packet. */ | |
4229 | OSPF_ISM_WRITE_ON(oi->ospf); | |
4230 | } | |
4231 | ||
4232 | static int ospf_ls_ack_send_event(struct thread *thread) | |
4233 | { | |
4234 | struct ospf_interface *oi = THREAD_ARG(thread); | |
4235 | ||
4236 | oi->t_ls_ack_direct = NULL; | |
4237 | ||
4238 | while (listcount(oi->ls_ack_direct.ls_ack)) | |
4239 | ospf_ls_ack_send_list(oi, oi->ls_ack_direct.ls_ack, | |
4240 | oi->ls_ack_direct.dst); | |
4241 | ||
4242 | return 0; | |
4243 | } | |
4244 | ||
4245 | void ospf_ls_ack_send(struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
4246 | { | |
4247 | struct ospf_interface *oi = nbr->oi; | |
4248 | ||
4249 | if (listcount(oi->ls_ack_direct.ls_ack) == 0) | |
4250 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
4251 | ||
4252 | listnode_add(oi->ls_ack_direct.ls_ack, ospf_lsa_lock(lsa)); | |
4253 | ||
4254 | thread_add_event(master, ospf_ls_ack_send_event, oi, 0, | |
4255 | &oi->t_ls_ack_direct); | |
718e3744 | 4256 | } |
4257 | ||
4258 | /* Send Link State Acknowledgment delayed. */ | |
d62a17ae | 4259 | void ospf_ls_ack_send_delayed(struct ospf_interface *oi) |
4260 | { | |
4261 | struct in_addr dst; | |
4262 | ||
4263 | /* Decide destination address. */ | |
4264 | /* RFC2328 Section 13.5 On non-broadcast | |
4265 | networks, delayed Link State Acknowledgment packets must be | |
4266 | unicast separately over each adjacency (i.e., neighbor whose | |
4267 | state is >= Exchange). */ | |
4268 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
4269 | struct ospf_neighbor *nbr; | |
4270 | struct route_node *rn; | |
4271 | ||
4272 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
4273 | if ((nbr = rn->info) != NULL) | |
4274 | if (nbr != oi->nbr_self | |
4275 | && nbr->state >= NSM_Exchange) | |
4276 | while (listcount(oi->ls_ack)) | |
4277 | ospf_ls_ack_send_list( | |
4278 | oi, oi->ls_ack, | |
4279 | nbr->address.u.prefix4); | |
4280 | return; | |
4281 | } | |
4282 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
4283 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
4284 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
4285 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4286 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4287 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4288 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) | |
4289 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4290 | else | |
4291 | dst.s_addr = htonl(OSPF_ALLDROUTERS); | |
4292 | ||
4293 | while (listcount(oi->ls_ack)) | |
4294 | ospf_ls_ack_send_list(oi, oi->ls_ack, dst); | |
718e3744 | 4295 | } |
8b6912c2 DS |
4296 | |
4297 | /* | |
4298 | * On pt-to-pt links, all OSPF control packets are sent to the multicast | |
4299 | * address. As a result, the kernel does not need to learn the interface | |
4300 | * MAC of the OSPF neighbor. However, in our world, this will delay | |
4301 | * convergence. Take the case when due to a link flap, all routes now | |
4302 | * want to use an interface which was deemed to be costlier prior to this | |
4303 | * event. For routes that will be installed, the missing MAC will have | |
4304 | * punt-to-CPU set on them. This may overload the CPU control path that | |
4305 | * can be avoided if the MAC was known apriori. | |
4306 | */ | |
89a48046 | 4307 | #define OSPF_PING_NBR_STR_MAX (BUFSIZ) |
d62a17ae | 4308 | void ospf_proactively_arp(struct ospf_neighbor *nbr) |
4309 | { | |
4310 | char ping_nbr[OSPF_PING_NBR_STR_MAX]; | |
d62a17ae | 4311 | int ret; |
4312 | ||
4313 | if (!nbr || !nbr->oi || !nbr->oi->ifp) | |
4314 | return; | |
4315 | ||
89a48046 | 4316 | snprintf(ping_nbr, sizeof(ping_nbr), |
996c9314 LB |
4317 | "ping -c 1 -I %s %s > /dev/null 2>&1 &", nbr->oi->ifp->name, |
4318 | inet_ntoa(nbr->address.u.prefix4)); | |
89a48046 | 4319 | |
d62a17ae | 4320 | ret = system(ping_nbr); |
4321 | if (IS_DEBUG_OSPF_EVENT) | |
4322 | zlog_debug("Executed %s %s", ping_nbr, | |
4323 | ((ret == 0) ? "successfully" : "but failed")); | |
8b6912c2 | 4324 | } |