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718e3744 | 1 | /* |
2 | * OSPF Sending and Receiving OSPF Packets. | |
3 | * Copyright (C) 1999, 2000 Toshiaki Takada | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | ||
cbf3e3eb | 25 | #include "monotime.h" |
718e3744 | 26 | #include "thread.h" |
27 | #include "memory.h" | |
28 | #include "linklist.h" | |
29 | #include "prefix.h" | |
30 | #include "if.h" | |
31 | #include "table.h" | |
32 | #include "sockunion.h" | |
33 | #include "stream.h" | |
34 | #include "log.h" | |
2dd8bb4e | 35 | #include "sockopt.h" |
484315fd | 36 | #include "checksum.h" |
c1a03d47 | 37 | #include "md5.h" |
7e2b7603 | 38 | #include "vrf.h" |
718e3744 | 39 | |
40 | #include "ospfd/ospfd.h" | |
41 | #include "ospfd/ospf_network.h" | |
42 | #include "ospfd/ospf_interface.h" | |
43 | #include "ospfd/ospf_ism.h" | |
44 | #include "ospfd/ospf_asbr.h" | |
45 | #include "ospfd/ospf_lsa.h" | |
46 | #include "ospfd/ospf_lsdb.h" | |
47 | #include "ospfd/ospf_neighbor.h" | |
48 | #include "ospfd/ospf_nsm.h" | |
49 | #include "ospfd/ospf_packet.h" | |
50 | #include "ospfd/ospf_spf.h" | |
51 | #include "ospfd/ospf_flood.h" | |
52 | #include "ospfd/ospf_dump.h" | |
53 | ||
166b75c2 DS |
54 | /* |
55 | * OSPF Fragmentation / fragmented writes | |
56 | * | |
57 | * ospfd can support writing fragmented packets, for cases where | |
58 | * kernel will not fragment IP_HDRINCL and/or multicast destined | |
59 | * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However, | |
60 | * SunOS, probably BSD too, clobber the user supplied IP ID and IP | |
61 | * flags fields, hence user-space fragmentation will not work. | |
62 | * Only Linux is known to leave IP header unmolested. | |
63 | * Further, fragmentation really should be done the kernel, which already | |
64 | * supports it, and which avoids nasty IP ID state problems. | |
65 | * | |
66 | * Fragmentation of OSPF packets can be required on networks with router | |
67 | * with many many interfaces active in one area, or on networks with links | |
68 | * with low MTUs. | |
69 | */ | |
70 | #ifdef GNU_LINUX | |
71 | #define WANT_OSPF_WRITE_FRAGMENT | |
72 | #endif | |
73 | ||
718e3744 | 74 | /* Packet Type String. */ |
ac4d0be5 | 75 | const struct message ospf_packet_type_str[] = { |
76 | {OSPF_MSG_HELLO, "Hello"}, | |
77 | {OSPF_MSG_DB_DESC, "Database Description"}, | |
78 | {OSPF_MSG_LS_REQ, "Link State Request"}, | |
79 | {OSPF_MSG_LS_UPD, "Link State Update"}, | |
80 | {OSPF_MSG_LS_ACK, "Link State Acknowledgment"}, | |
81 | {0}}; | |
718e3744 | 82 | |
75c8eabb DO |
83 | /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of |
84 | particular types, offset is the "type" field of a packet. */ | |
ac4d0be5 | 85 | static const u_int16_t ospf_packet_minlen[] = { |
86 | 0, | |
87 | OSPF_HELLO_MIN_SIZE, | |
88 | OSPF_DB_DESC_MIN_SIZE, | |
89 | OSPF_LS_REQ_MIN_SIZE, | |
90 | OSPF_LS_UPD_MIN_SIZE, | |
91 | OSPF_LS_ACK_MIN_SIZE, | |
75c8eabb DO |
92 | }; |
93 | ||
4e31de79 DO |
94 | /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular |
95 | types, offset is the "LSA type" field. */ | |
ac4d0be5 | 96 | static const u_int16_t ospf_lsa_minlen[] = { |
97 | 0, | |
98 | OSPF_ROUTER_LSA_MIN_SIZE, | |
99 | OSPF_NETWORK_LSA_MIN_SIZE, | |
100 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
101 | OSPF_SUMMARY_LSA_MIN_SIZE, | |
102 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
103 | 0, | |
104 | OSPF_AS_EXTERNAL_LSA_MIN_SIZE, | |
105 | 0, | |
106 | 0, | |
107 | 0, | |
108 | 0, | |
4e31de79 DO |
109 | }; |
110 | ||
bd5651f0 | 111 | /* for ospf_check_auth() */ |
ac4d0be5 | 112 | static int ospf_check_sum(struct ospf_header *); |
bd5651f0 | 113 | |
718e3744 | 114 | /* OSPF authentication checking function */ |
ac4d0be5 | 115 | static int ospf_auth_type(struct ospf_interface *oi) |
718e3744 | 116 | { |
ac4d0be5 | 117 | int auth_type; |
718e3744 | 118 | |
ac4d0be5 | 119 | if (OSPF_IF_PARAM(oi, auth_type) == OSPF_AUTH_NOTSET) |
120 | auth_type = oi->area->auth_type; | |
121 | else | |
122 | auth_type = OSPF_IF_PARAM(oi, auth_type); | |
718e3744 | 123 | |
ac4d0be5 | 124 | /* Handle case where MD5 key list is not configured aka Cisco */ |
125 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC | |
126 | && list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) | |
127 | return OSPF_AUTH_NULL; | |
718e3744 | 128 | |
ac4d0be5 | 129 | return auth_type; |
718e3744 | 130 | } |
131 | ||
ac4d0be5 | 132 | struct ospf_packet *ospf_packet_new(size_t size) |
718e3744 | 133 | { |
ac4d0be5 | 134 | struct ospf_packet *new; |
718e3744 | 135 | |
ac4d0be5 | 136 | new = XCALLOC(MTYPE_OSPF_PACKET, sizeof(struct ospf_packet)); |
137 | new->s = stream_new(size); | |
718e3744 | 138 | |
ac4d0be5 | 139 | return new; |
718e3744 | 140 | } |
141 | ||
ac4d0be5 | 142 | void ospf_packet_free(struct ospf_packet *op) |
718e3744 | 143 | { |
ac4d0be5 | 144 | if (op->s) |
145 | stream_free(op->s); | |
718e3744 | 146 | |
ac4d0be5 | 147 | XFREE(MTYPE_OSPF_PACKET, op); |
718e3744 | 148 | |
ac4d0be5 | 149 | op = NULL; |
718e3744 | 150 | } |
151 | ||
ac4d0be5 | 152 | struct ospf_fifo *ospf_fifo_new() |
718e3744 | 153 | { |
ac4d0be5 | 154 | struct ospf_fifo *new; |
718e3744 | 155 | |
ac4d0be5 | 156 | new = XCALLOC(MTYPE_OSPF_FIFO, sizeof(struct ospf_fifo)); |
157 | return new; | |
718e3744 | 158 | } |
159 | ||
160 | /* Add new packet to fifo. */ | |
ac4d0be5 | 161 | void ospf_fifo_push(struct ospf_fifo *fifo, struct ospf_packet *op) |
718e3744 | 162 | { |
ac4d0be5 | 163 | if (fifo->tail) |
164 | fifo->tail->next = op; | |
165 | else | |
166 | fifo->head = op; | |
718e3744 | 167 | |
ac4d0be5 | 168 | fifo->tail = op; |
718e3744 | 169 | |
ac4d0be5 | 170 | fifo->count++; |
718e3744 | 171 | } |
172 | ||
aa276fd7 | 173 | /* Add new packet to head of fifo. */ |
ac4d0be5 | 174 | static void ospf_fifo_push_head(struct ospf_fifo *fifo, struct ospf_packet *op) |
aa276fd7 | 175 | { |
ac4d0be5 | 176 | op->next = fifo->head; |
177 | ||
178 | if (fifo->tail == NULL) | |
179 | fifo->tail = op; | |
180 | ||
181 | fifo->head = op; | |
182 | ||
183 | fifo->count++; | |
aa276fd7 PJ |
184 | } |
185 | ||
718e3744 | 186 | /* Delete first packet from fifo. */ |
ac4d0be5 | 187 | struct ospf_packet *ospf_fifo_pop(struct ospf_fifo *fifo) |
718e3744 | 188 | { |
ac4d0be5 | 189 | struct ospf_packet *op; |
718e3744 | 190 | |
ac4d0be5 | 191 | op = fifo->head; |
718e3744 | 192 | |
ac4d0be5 | 193 | if (op) { |
194 | fifo->head = op->next; | |
718e3744 | 195 | |
ac4d0be5 | 196 | if (fifo->head == NULL) |
197 | fifo->tail = NULL; | |
718e3744 | 198 | |
ac4d0be5 | 199 | fifo->count--; |
200 | } | |
718e3744 | 201 | |
ac4d0be5 | 202 | return op; |
718e3744 | 203 | } |
204 | ||
205 | /* Return first fifo entry. */ | |
ac4d0be5 | 206 | struct ospf_packet *ospf_fifo_head(struct ospf_fifo *fifo) |
718e3744 | 207 | { |
ac4d0be5 | 208 | return fifo->head; |
718e3744 | 209 | } |
210 | ||
211 | /* Flush ospf packet fifo. */ | |
ac4d0be5 | 212 | void ospf_fifo_flush(struct ospf_fifo *fifo) |
718e3744 | 213 | { |
ac4d0be5 | 214 | struct ospf_packet *op; |
215 | struct ospf_packet *next; | |
718e3744 | 216 | |
ac4d0be5 | 217 | for (op = fifo->head; op; op = next) { |
218 | next = op->next; | |
219 | ospf_packet_free(op); | |
220 | } | |
221 | fifo->head = fifo->tail = NULL; | |
222 | fifo->count = 0; | |
718e3744 | 223 | } |
224 | ||
225 | /* Free ospf packet fifo. */ | |
ac4d0be5 | 226 | void ospf_fifo_free(struct ospf_fifo *fifo) |
718e3744 | 227 | { |
ac4d0be5 | 228 | ospf_fifo_flush(fifo); |
718e3744 | 229 | |
ac4d0be5 | 230 | XFREE(MTYPE_OSPF_FIFO, fifo); |
718e3744 | 231 | } |
232 | ||
ac4d0be5 | 233 | void ospf_packet_add(struct ospf_interface *oi, struct ospf_packet *op) |
718e3744 | 234 | { |
ac4d0be5 | 235 | if (!oi->obuf) { |
236 | zlog_err( | |
237 | "ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
238 | "destination %s) called with NULL obuf, ignoring " | |
239 | "(please report this bug)!\n", | |
240 | IF_NAME(oi), oi->state, | |
241 | lookup_msg(ospf_ism_state_msg, oi->state, NULL), | |
242 | lookup_msg(ospf_packet_type_str, | |
243 | stream_getc_from(op->s, 1), NULL), | |
244 | inet_ntoa(op->dst)); | |
245 | return; | |
246 | } | |
c3eab871 | 247 | |
ac4d0be5 | 248 | /* Add packet to end of queue. */ |
249 | ospf_fifo_push(oi->obuf, op); | |
718e3744 | 250 | |
ac4d0be5 | 251 | /* Debug of packet fifo*/ |
252 | /* ospf_fifo_debug (oi->obuf); */ | |
718e3744 | 253 | } |
254 | ||
ac4d0be5 | 255 | static void ospf_packet_add_top(struct ospf_interface *oi, |
256 | struct ospf_packet *op) | |
aa276fd7 | 257 | { |
ac4d0be5 | 258 | if (!oi->obuf) { |
259 | zlog_err( | |
260 | "ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
261 | "destination %s) called with NULL obuf, ignoring " | |
262 | "(please report this bug)!\n", | |
263 | IF_NAME(oi), oi->state, | |
264 | lookup_msg(ospf_ism_state_msg, oi->state, NULL), | |
265 | lookup_msg(ospf_packet_type_str, | |
266 | stream_getc_from(op->s, 1), NULL), | |
267 | inet_ntoa(op->dst)); | |
268 | return; | |
269 | } | |
aa276fd7 | 270 | |
ac4d0be5 | 271 | /* Add packet to head of queue. */ |
272 | ospf_fifo_push_head(oi->obuf, op); | |
aa276fd7 | 273 | |
ac4d0be5 | 274 | /* Debug of packet fifo*/ |
275 | /* ospf_fifo_debug (oi->obuf); */ | |
aa276fd7 PJ |
276 | } |
277 | ||
ac4d0be5 | 278 | void ospf_packet_delete(struct ospf_interface *oi) |
718e3744 | 279 | { |
ac4d0be5 | 280 | struct ospf_packet *op; |
281 | ||
282 | op = ospf_fifo_pop(oi->obuf); | |
718e3744 | 283 | |
ac4d0be5 | 284 | if (op) |
285 | ospf_packet_free(op); | |
718e3744 | 286 | } |
287 | ||
ac4d0be5 | 288 | struct ospf_packet *ospf_packet_dup(struct ospf_packet *op) |
718e3744 | 289 | { |
ac4d0be5 | 290 | struct ospf_packet *new; |
718e3744 | 291 | |
ac4d0be5 | 292 | if (stream_get_endp(op->s) != op->length) |
293 | /* XXX size_t */ | |
294 | zlog_warn( | |
295 | "ospf_packet_dup stream %lu ospf_packet %u size mismatch", | |
296 | (u_long)STREAM_SIZE(op->s), op->length); | |
30961a15 | 297 | |
ac4d0be5 | 298 | /* Reserve space for MD5 authentication that may be added later. */ |
299 | new = ospf_packet_new(stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
300 | stream_copy(new->s, op->s); | |
718e3744 | 301 | |
ac4d0be5 | 302 | new->dst = op->dst; |
303 | new->length = op->length; | |
718e3744 | 304 | |
ac4d0be5 | 305 | return new; |
718e3744 | 306 | } |
307 | ||
86f1fd96 | 308 | /* XXX inline */ |
ac4d0be5 | 309 | static unsigned int ospf_packet_authspace(struct ospf_interface *oi) |
86f1fd96 | 310 | { |
ac4d0be5 | 311 | int auth = 0; |
86f1fd96 | 312 | |
ac4d0be5 | 313 | if (ospf_auth_type(oi) == OSPF_AUTH_CRYPTOGRAPHIC) |
314 | auth = OSPF_AUTH_MD5_SIZE; | |
86f1fd96 | 315 | |
ac4d0be5 | 316 | return auth; |
86f1fd96 | 317 | } |
318 | ||
ac4d0be5 | 319 | static unsigned int ospf_packet_max(struct ospf_interface *oi) |
718e3744 | 320 | { |
ac4d0be5 | 321 | int max; |
718e3744 | 322 | |
ac4d0be5 | 323 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
86f1fd96 | 324 | |
ac4d0be5 | 325 | max -= (OSPF_HEADER_SIZE + sizeof(struct ip)); |
718e3744 | 326 | |
ac4d0be5 | 327 | return max; |
718e3744 | 328 | } |
329 | ||
6b0655a2 | 330 | |
ac4d0be5 | 331 | static int ospf_check_md5_digest(struct ospf_interface *oi, |
332 | struct ospf_header *ospfh) | |
718e3744 | 333 | { |
ac4d0be5 | 334 | MD5_CTX ctx; |
335 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; | |
336 | struct crypt_key *ck; | |
337 | struct ospf_neighbor *nbr; | |
338 | u_int16_t length = ntohs(ospfh->length); | |
339 | ||
340 | /* Get secret key. */ | |
341 | ck = ospf_crypt_key_lookup(OSPF_IF_PARAM(oi, auth_crypt), | |
342 | ospfh->u.crypt.key_id); | |
343 | if (ck == NULL) { | |
344 | zlog_warn("interface %s: ospf_check_md5 no key %d", IF_NAME(oi), | |
345 | ospfh->u.crypt.key_id); | |
346 | return 0; | |
347 | } | |
718e3744 | 348 | |
ac4d0be5 | 349 | /* check crypto seqnum. */ |
350 | nbr = ospf_nbr_lookup_by_routerid(oi->nbrs, &ospfh->router_id); | |
718e3744 | 351 | |
ac4d0be5 | 352 | if (nbr |
353 | && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) { | |
354 | zlog_warn( | |
355 | "interface %s: ospf_check_md5 bad sequence %d (expect %d)", | |
356 | IF_NAME(oi), ntohl(ospfh->u.crypt.crypt_seqnum), | |
357 | ntohl(nbr->crypt_seqnum)); | |
358 | return 0; | |
359 | } | |
718e3744 | 360 | |
ac4d0be5 | 361 | /* Generate a digest for the ospf packet - their digest + our digest. */ |
362 | memset(&ctx, 0, sizeof(ctx)); | |
363 | MD5Init(&ctx); | |
364 | MD5Update(&ctx, ospfh, length); | |
365 | MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); | |
366 | MD5Final(digest, &ctx); | |
367 | ||
368 | /* compare the two */ | |
369 | if (memcmp((caddr_t)ospfh + length, digest, OSPF_AUTH_MD5_SIZE)) { | |
370 | zlog_warn("interface %s: ospf_check_md5 checksum mismatch", | |
371 | IF_NAME(oi)); | |
372 | return 0; | |
373 | } | |
718e3744 | 374 | |
ac4d0be5 | 375 | /* save neighbor's crypt_seqnum */ |
376 | if (nbr) | |
377 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
378 | return 1; | |
718e3744 | 379 | } |
380 | ||
381 | /* This function is called from ospf_write(), it will detect the | |
382 | authentication scheme and if it is MD5, it will change the sequence | |
383 | and update the MD5 digest. */ | |
ac4d0be5 | 384 | static int ospf_make_md5_digest(struct ospf_interface *oi, |
385 | struct ospf_packet *op) | |
386 | { | |
387 | struct ospf_header *ospfh; | |
388 | unsigned char digest[OSPF_AUTH_MD5_SIZE] = {0}; | |
389 | MD5_CTX ctx; | |
390 | void *ibuf; | |
391 | u_int32_t t; | |
392 | struct crypt_key *ck; | |
393 | const u_int8_t *auth_key; | |
394 | ||
395 | ibuf = STREAM_DATA(op->s); | |
396 | ospfh = (struct ospf_header *)ibuf; | |
397 | ||
398 | if (ntohs(ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
399 | return 0; | |
400 | ||
401 | /* We do this here so when we dup a packet, we don't have to | |
402 | waste CPU rewriting other headers. | |
403 | ||
404 | Note that quagga_time /deliberately/ is not used here */ | |
405 | t = (time(NULL) & 0xFFFFFFFF); | |
406 | if (t > oi->crypt_seqnum) | |
407 | oi->crypt_seqnum = t; | |
408 | else | |
409 | oi->crypt_seqnum++; | |
410 | ||
411 | ospfh->u.crypt.crypt_seqnum = htonl(oi->crypt_seqnum); | |
412 | ||
413 | /* Get MD5 Authentication key from auth_key list. */ | |
414 | if (list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) | |
415 | auth_key = (const u_int8_t *)digest; | |
416 | else { | |
417 | ck = listgetdata(listtail(OSPF_IF_PARAM(oi, auth_crypt))); | |
418 | auth_key = ck->auth_key; | |
419 | } | |
718e3744 | 420 | |
ac4d0be5 | 421 | /* Generate a digest for the entire packet + our secret key. */ |
422 | memset(&ctx, 0, sizeof(ctx)); | |
423 | MD5Init(&ctx); | |
424 | MD5Update(&ctx, ibuf, ntohs(ospfh->length)); | |
425 | MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
426 | MD5Final(digest, &ctx); | |
718e3744 | 427 | |
ac4d0be5 | 428 | /* Append md5 digest to the end of the stream. */ |
429 | stream_put(op->s, digest, OSPF_AUTH_MD5_SIZE); | |
718e3744 | 430 | |
ac4d0be5 | 431 | /* We do *NOT* increment the OSPF header length. */ |
432 | op->length = ntohs(ospfh->length) + OSPF_AUTH_MD5_SIZE; | |
30961a15 | 433 | |
ac4d0be5 | 434 | if (stream_get_endp(op->s) != op->length) |
435 | /* XXX size_t */ | |
436 | zlog_warn( | |
437 | "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u", | |
438 | (u_long)stream_get_endp(op->s), op->length); | |
718e3744 | 439 | |
ac4d0be5 | 440 | return OSPF_AUTH_MD5_SIZE; |
718e3744 | 441 | } |
442 | ||
6b0655a2 | 443 | |
ac4d0be5 | 444 | static int ospf_ls_req_timer(struct thread *thread) |
718e3744 | 445 | { |
ac4d0be5 | 446 | struct ospf_neighbor *nbr; |
718e3744 | 447 | |
ac4d0be5 | 448 | nbr = THREAD_ARG(thread); |
449 | nbr->t_ls_req = NULL; | |
718e3744 | 450 | |
ac4d0be5 | 451 | /* Send Link State Request. */ |
452 | if (ospf_ls_request_count(nbr)) | |
453 | ospf_ls_req_send(nbr); | |
718e3744 | 454 | |
ac4d0be5 | 455 | /* Set Link State Request retransmission timer. */ |
456 | OSPF_NSM_TIMER_ON(nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
718e3744 | 457 | |
ac4d0be5 | 458 | return 0; |
718e3744 | 459 | } |
460 | ||
ac4d0be5 | 461 | void ospf_ls_req_event(struct ospf_neighbor *nbr) |
718e3744 | 462 | { |
ac4d0be5 | 463 | if (nbr->t_ls_req) { |
464 | thread_cancel(nbr->t_ls_req); | |
465 | nbr->t_ls_req = NULL; | |
466 | } | |
467 | nbr->t_ls_req = thread_add_event(master, ospf_ls_req_timer, nbr, 0); | |
718e3744 | 468 | } |
469 | ||
470 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
471 | ospf_neighbor.c */ | |
ac4d0be5 | 472 | int ospf_ls_upd_timer(struct thread *thread) |
473 | { | |
474 | struct ospf_neighbor *nbr; | |
475 | ||
476 | nbr = THREAD_ARG(thread); | |
477 | nbr->t_ls_upd = NULL; | |
478 | ||
479 | /* Send Link State Update. */ | |
480 | if (ospf_ls_retransmit_count(nbr) > 0) { | |
481 | struct list *update; | |
482 | struct ospf_lsdb *lsdb; | |
483 | int i; | |
484 | int retransmit_interval; | |
485 | ||
486 | retransmit_interval = | |
487 | OSPF_IF_PARAM(nbr->oi, retransmit_interval); | |
488 | ||
489 | lsdb = &nbr->ls_rxmt; | |
490 | update = list_new(); | |
491 | ||
492 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { | |
493 | struct route_table *table = lsdb->type[i].db; | |
494 | struct route_node *rn; | |
495 | ||
496 | for (rn = route_top(table); rn; rn = route_next(rn)) { | |
497 | struct ospf_lsa *lsa; | |
498 | ||
499 | if ((lsa = rn->info) != NULL) { | |
500 | /* Don't retransmit an LSA if we | |
501 | received it within | |
502 | the last RxmtInterval seconds - this | |
503 | is to allow the | |
504 | neighbour a chance to acknowledge the | |
505 | LSA as it may | |
506 | have ben just received before the | |
507 | retransmit timer | |
508 | fired. This is a small tweak to what | |
509 | is in the RFC, | |
510 | but it will cut out out a lot of | |
511 | retransmit traffic | |
512 | - MAG */ | |
513 | if (monotime_since(&lsa->tv_recv, NULL) | |
514 | >= retransmit_interval * 1000000LL) | |
515 | listnode_add(update, rn->info); | |
516 | } | |
517 | } | |
518 | } | |
718e3744 | 519 | |
ac4d0be5 | 520 | if (listcount(update) > 0) |
521 | ospf_ls_upd_send(nbr, update, OSPF_SEND_PACKET_DIRECT); | |
522 | list_delete(update); | |
718e3744 | 523 | } |
524 | ||
ac4d0be5 | 525 | /* Set LS Update retransmission timer. */ |
526 | OSPF_NSM_TIMER_ON(nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
718e3744 | 527 | |
ac4d0be5 | 528 | return 0; |
718e3744 | 529 | } |
530 | ||
ac4d0be5 | 531 | int ospf_ls_ack_timer(struct thread *thread) |
718e3744 | 532 | { |
ac4d0be5 | 533 | struct ospf_interface *oi; |
718e3744 | 534 | |
ac4d0be5 | 535 | oi = THREAD_ARG(thread); |
536 | oi->t_ls_ack = NULL; | |
718e3744 | 537 | |
ac4d0be5 | 538 | /* Send Link State Acknowledgment. */ |
539 | if (listcount(oi->ls_ack) > 0) | |
540 | ospf_ls_ack_send_delayed(oi); | |
718e3744 | 541 | |
ac4d0be5 | 542 | /* Set LS Ack timer. */ |
543 | OSPF_ISM_TIMER_ON(oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
718e3744 | 544 | |
ac4d0be5 | 545 | return 0; |
718e3744 | 546 | } |
547 | ||
0bfeca3f | 548 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
ac4d0be5 | 549 | static void ospf_write_frags(int fd, struct ospf_packet *op, struct ip *iph, |
550 | struct msghdr *msg, unsigned int maxdatasize, | |
551 | unsigned int mtu, int flags, u_char type) | |
0bfeca3f | 552 | { |
553 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
ac4d0be5 | 554 | u_int16_t offset; |
555 | struct iovec *iovp; | |
556 | int ret; | |
557 | ||
558 | assert(op->length == stream_get_endp(op->s)); | |
559 | assert(msg->msg_iovlen == 2); | |
560 | ||
561 | /* we can but try. | |
562 | * | |
563 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
564 | * well as the IP_MF flag, making this all quite pointless. | |
565 | * | |
566 | * However, for a system on which IP_MF is left alone, and ip_id left | |
567 | * alone or else which sets same ip_id for each fragment this might | |
568 | * work, eg linux. | |
569 | * | |
570 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
571 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
572 | * be raised against the various kernels. | |
573 | */ | |
574 | ||
575 | /* set More Frag */ | |
576 | iph->ip_off |= IP_MF; | |
577 | ||
578 | /* ip frag offset is expressed in units of 8byte words */ | |
579 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
580 | ||
581 | iovp = &msg->msg_iov[1]; | |
582 | ||
583 | while ((stream_get_endp(op->s) - stream_get_getp(op->s)) | |
584 | > maxdatasize) { | |
585 | /* data length of this frag is to next offset value */ | |
586 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; | |
587 | iph->ip_len = iovp->iov_len + sizeof(struct ip); | |
588 | assert(iph->ip_len <= mtu); | |
589 | ||
590 | sockopt_iphdrincl_swab_htosys(iph); | |
591 | ||
592 | ret = sendmsg(fd, msg, flags); | |
593 | ||
594 | sockopt_iphdrincl_swab_systoh(iph); | |
595 | ||
596 | if (ret < 0) | |
597 | zlog_warn( | |
598 | "*** ospf_write_frags: sendmsg failed to %s," | |
599 | " id %d, off %d, len %d, mtu %u failed with %s", | |
600 | inet_ntoa(iph->ip_dst), iph->ip_id, iph->ip_off, | |
601 | iph->ip_len, mtu, safe_strerror(errno)); | |
602 | ||
603 | if (IS_DEBUG_OSPF_PACKET(type - 1, SEND)) { | |
604 | zlog_debug( | |
605 | "ospf_write_frags: sent id %d, off %d, len %d to %s\n", | |
606 | iph->ip_id, iph->ip_off, iph->ip_len, | |
607 | inet_ntoa(iph->ip_dst)); | |
608 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) { | |
609 | zlog_debug( | |
610 | "-----------------IP Header Dump----------------------"); | |
611 | ospf_ip_header_dump(iph); | |
612 | zlog_debug( | |
613 | "-----------------------------------------------------"); | |
614 | } | |
615 | } | |
616 | ||
617 | iph->ip_off += offset; | |
618 | stream_forward_getp(op->s, iovp->iov_len); | |
619 | iovp->iov_base = STREAM_PNT(op->s); | |
620 | } | |
621 | ||
622 | /* setup for final fragment */ | |
623 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp(op->s); | |
624 | iph->ip_len = iovp->iov_len + sizeof(struct ip); | |
625 | iph->ip_off &= (~IP_MF); | |
0bfeca3f | 626 | } |
627 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
628 | ||
ac4d0be5 | 629 | static int ospf_write(struct thread *thread) |
630 | { | |
631 | struct ospf *ospf = THREAD_ARG(thread); | |
632 | struct ospf_interface *oi; | |
633 | struct ospf_interface *last_serviced_oi = NULL; | |
634 | struct ospf_packet *op; | |
635 | struct sockaddr_in sa_dst; | |
636 | struct ip iph; | |
637 | struct msghdr msg; | |
638 | struct iovec iov[2]; | |
639 | u_char type; | |
640 | int ret; | |
641 | int flags = 0; | |
642 | struct listnode *node; | |
0bfeca3f | 643 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
ac4d0be5 | 644 | static u_int16_t ipid = 0; |
645 | u_int16_t maxdatasize; | |
233cc0fb | 646 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
ac4d0be5 | 647 | /* $FRR indent$ */ |
648 | /* clang-format off */ | |
68b7339a | 649 | #define OSPF_WRITE_IPHL_SHIFT 2 |
ac4d0be5 | 650 | int pkt_count = 0; |
651 | ||
652 | ospf->t_write = NULL; | |
718e3744 | 653 | |
ac4d0be5 | 654 | node = listhead(ospf->oi_write_q); |
655 | assert(node); | |
656 | oi = listgetdata(node); | |
657 | assert(oi); | |
0bfeca3f | 658 | |
659 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
ac4d0be5 | 660 | /* seed ipid static with low order bits of time */ |
661 | if (ipid == 0) | |
662 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 663 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
664 | ||
ac4d0be5 | 665 | while ((pkt_count < ospf->write_oi_count) && oi |
666 | && (last_serviced_oi != oi)) { | |
667 | /* If there is only packet in the queue, the oi is removed from | |
668 | write-q, so fix up the last interface that was serviced */ | |
669 | if (last_serviced_oi == NULL) { | |
670 | last_serviced_oi = oi; | |
671 | } | |
672 | pkt_count++; | |
233cc0fb | 673 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
ac4d0be5 | 674 | /* convenience - max OSPF data per packet */ |
675 | maxdatasize = oi->ifp->mtu - sizeof(struct ip); | |
233cc0fb | 676 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
ac4d0be5 | 677 | /* Get one packet from queue. */ |
678 | op = ospf_fifo_head(oi->obuf); | |
679 | assert(op); | |
680 | assert(op->length >= OSPF_HEADER_SIZE); | |
681 | ||
682 | if (op->dst.s_addr == htonl(OSPF_ALLSPFROUTERS) | |
683 | || op->dst.s_addr == htonl(OSPF_ALLDROUTERS)) | |
684 | ospf_if_ipmulticast(ospf, oi->address, | |
685 | oi->ifp->ifindex); | |
686 | ||
687 | /* Rewrite the md5 signature & update the seq */ | |
688 | ospf_make_md5_digest(oi, op); | |
689 | ||
690 | /* Retrieve OSPF packet type. */ | |
691 | stream_set_getp(op->s, 1); | |
692 | type = stream_getc(op->s); | |
693 | ||
694 | /* reset get pointer */ | |
695 | stream_set_getp(op->s, 0); | |
696 | ||
697 | memset(&iph, 0, sizeof(struct ip)); | |
698 | memset(&sa_dst, 0, sizeof(sa_dst)); | |
699 | ||
700 | sa_dst.sin_family = AF_INET; | |
6f0e3f6e | 701 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
ac4d0be5 | 702 | sa_dst.sin_len = sizeof(sa_dst); |
6f0e3f6e | 703 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
ac4d0be5 | 704 | sa_dst.sin_addr = op->dst; |
705 | sa_dst.sin_port = htons(0); | |
706 | ||
707 | /* Set DONTROUTE flag if dst is unicast. */ | |
708 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
709 | if (!IN_MULTICAST(htonl(op->dst.s_addr))) | |
710 | flags = MSG_DONTROUTE; | |
711 | ||
712 | iph.ip_hl = sizeof(struct ip) >> OSPF_WRITE_IPHL_SHIFT; | |
713 | /* it'd be very strange for header to not be 4byte-word aligned | |
714 | * but.. */ | |
715 | if (sizeof(struct ip) | |
716 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT)) | |
717 | iph.ip_hl++; /* we presume sizeof struct ip cant | |
718 | overflow ip_hl.. */ | |
719 | ||
720 | iph.ip_v = IPVERSION; | |
721 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; | |
722 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; | |
68b7339a | 723 | |
0150c9c9 | 724 | #if defined(__DragonFly__) |
ac4d0be5 | 725 | /* |
726 | * DragonFly's raw socket expects ip_len/ip_off in network byte | |
727 | * order. | |
728 | */ | |
729 | iph.ip_len = htons(iph.ip_len); | |
0150c9c9 DB |
730 | #endif |
731 | ||
0bfeca3f | 732 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
ac4d0be5 | 733 | /* XXX-MT: not thread-safe at all.. |
734 | * XXX: this presumes this is only programme sending OSPF | |
735 | * packets | |
736 | * otherwise, no guarantee ipid will be unique | |
737 | */ | |
738 | iph.ip_id = ++ipid; | |
0bfeca3f | 739 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
740 | ||
ac4d0be5 | 741 | iph.ip_off = 0; |
742 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
743 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
744 | else | |
745 | iph.ip_ttl = OSPF_IP_TTL; | |
746 | iph.ip_p = IPPROTO_OSPFIGP; | |
747 | iph.ip_sum = 0; | |
748 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
749 | iph.ip_dst.s_addr = op->dst.s_addr; | |
750 | ||
751 | memset(&msg, 0, sizeof(msg)); | |
752 | msg.msg_name = (caddr_t)&sa_dst; | |
753 | msg.msg_namelen = sizeof(sa_dst); | |
754 | msg.msg_iov = iov; | |
755 | msg.msg_iovlen = 2; | |
756 | iov[0].iov_base = (char *)&iph; | |
757 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; | |
758 | iov[1].iov_base = STREAM_PNT(op->s); | |
759 | iov[1].iov_len = op->length; | |
760 | ||
761 | /* Sadly we can not rely on kernels to fragment packets because of either | |
762 | * IP_HDRINCL and/or multicast destination being set. | |
763 | */ | |
0bfeca3f | 764 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
ac4d0be5 | 765 | if (op->length > maxdatasize) |
766 | ospf_write_frags(ospf->fd, op, &iph, &msg, maxdatasize, | |
767 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 768 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 769 | |
ac4d0be5 | 770 | /* send final fragment (could be first) */ |
771 | sockopt_iphdrincl_swab_htosys(&iph); | |
772 | ret = sendmsg(ospf->fd, &msg, flags); | |
773 | sockopt_iphdrincl_swab_systoh(&iph); | |
774 | if (IS_DEBUG_OSPF_EVENT) | |
775 | zlog_debug( | |
776 | "ospf_write to %s, " | |
777 | "id %d, off %d, len %d, interface %s, mtu %u:", | |
778 | inet_ntoa(iph.ip_dst), iph.ip_id, iph.ip_off, | |
779 | iph.ip_len, oi->ifp->name, oi->ifp->mtu); | |
780 | ||
781 | if (ret < 0) | |
782 | zlog_warn( | |
783 | "*** sendmsg in ospf_write failed to %s, " | |
784 | "id %d, off %d, len %d, interface %s, mtu %u: %s", | |
785 | inet_ntoa(iph.ip_dst), iph.ip_id, iph.ip_off, | |
786 | iph.ip_len, oi->ifp->name, oi->ifp->mtu, | |
787 | safe_strerror(errno)); | |
788 | ||
789 | /* Show debug sending packet. */ | |
790 | if (IS_DEBUG_OSPF_PACKET(type - 1, SEND)) { | |
791 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) { | |
792 | zlog_debug( | |
793 | "-----------------------------------------------------"); | |
794 | ospf_ip_header_dump(&iph); | |
795 | stream_set_getp(op->s, 0); | |
796 | ospf_packet_dump(op->s); | |
797 | } | |
798 | ||
799 | zlog_debug("%s sent to [%s] via [%s].", | |
800 | lookup_msg(ospf_packet_type_str, type, NULL), | |
801 | inet_ntoa(op->dst), IF_NAME(oi)); | |
802 | ||
803 | if (IS_DEBUG_OSPF_PACKET(type - 1, DETAIL)) | |
804 | zlog_debug( | |
805 | "-----------------------------------------------------"); | |
806 | } | |
807 | ||
808 | /* Now delete packet from queue. */ | |
809 | ospf_packet_delete(oi); | |
810 | ||
811 | /* Move this interface to the tail of write_q to | |
812 | serve everyone in a round robin fashion */ | |
813 | list_delete_node(ospf->oi_write_q, node); | |
814 | if (ospf_fifo_head(oi->obuf) == NULL) { | |
815 | oi->on_write_q = 0; | |
816 | last_serviced_oi = NULL; | |
817 | oi = NULL; | |
818 | } else { | |
819 | listnode_add(ospf->oi_write_q, oi); | |
820 | } | |
821 | ||
822 | /* Setup to service from the head of the queue again */ | |
823 | if (!list_isempty(ospf->oi_write_q)) { | |
824 | node = listhead(ospf->oi_write_q); | |
825 | assert(node); | |
826 | oi = listgetdata(node); | |
827 | assert(oi); | |
e8f45e82 DS |
828 | } |
829 | } | |
718e3744 | 830 | |
ac4d0be5 | 831 | /* If packets still remain in queue, call write thread. */ |
832 | if (!list_isempty(ospf->oi_write_q)) | |
833 | ospf->t_write = | |
834 | thread_add_write(master, ospf_write, ospf, ospf->fd); | |
835 | ||
836 | return 0; | |
718e3744 | 837 | } |
838 | ||
839 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
ac4d0be5 | 840 | static void ospf_hello(struct ip *iph, struct ospf_header *ospfh, |
841 | struct stream *s, struct ospf_interface *oi, int size) | |
842 | { | |
843 | struct ospf_hello *hello; | |
844 | struct ospf_neighbor *nbr; | |
845 | int old_state; | |
846 | struct prefix p; | |
847 | ||
848 | /* increment statistics. */ | |
849 | oi->hello_in++; | |
850 | ||
851 | hello = (struct ospf_hello *)STREAM_PNT(s); | |
852 | ||
853 | /* If Hello is myself, silently discard. */ | |
854 | if (IPV4_ADDR_SAME(&ospfh->router_id, &oi->ospf->router_id)) { | |
855 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) { | |
856 | zlog_debug( | |
857 | "ospf_header[%s/%s]: selforiginated, " | |
858 | "dropping.", | |
859 | lookup_msg(ospf_packet_type_str, ospfh->type, | |
860 | NULL), | |
861 | inet_ntoa(iph->ip_src)); | |
862 | } | |
863 | return; | |
864 | } | |
865 | ||
866 | /* get neighbor prefix. */ | |
867 | p.family = AF_INET; | |
868 | p.prefixlen = ip_masklen(hello->network_mask); | |
869 | p.u.prefix4 = iph->ip_src; | |
870 | ||
871 | /* Compare network mask. */ | |
872 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
873 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
874 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
875 | if (oi->address->prefixlen != p.prefixlen) { | |
876 | zlog_warn( | |
877 | "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).", | |
878 | inet_ntoa(ospfh->router_id), IF_NAME(oi), | |
879 | (int)oi->address->prefixlen, (int)p.prefixlen); | |
880 | return; | |
881 | } | |
882 | ||
883 | /* Compare Router Dead Interval. */ | |
884 | if (OSPF_IF_PARAM(oi, v_wait) != ntohl(hello->dead_interval)) { | |
885 | zlog_warn( | |
886 | "Packet %s [Hello:RECV]: RouterDeadInterval mismatch " | |
887 | "(expected %u, but received %u).", | |
888 | inet_ntoa(ospfh->router_id), OSPF_IF_PARAM(oi, v_wait), | |
889 | ntohl(hello->dead_interval)); | |
890 | return; | |
891 | } | |
892 | ||
893 | /* Compare Hello Interval - ignored if fast-hellos are set. */ | |
894 | if (OSPF_IF_PARAM(oi, fast_hello) == 0) { | |
895 | if (OSPF_IF_PARAM(oi, v_hello) | |
896 | != ntohs(hello->hello_interval)) { | |
897 | zlog_warn( | |
898 | "Packet %s [Hello:RECV]: HelloInterval mismatch " | |
899 | "(expected %u, but received %u).", | |
900 | inet_ntoa(ospfh->router_id), | |
901 | OSPF_IF_PARAM(oi, v_hello), | |
902 | ntohs(hello->hello_interval)); | |
903 | return; | |
904 | } | |
905 | } | |
906 | ||
907 | if (IS_DEBUG_OSPF_EVENT) | |
908 | zlog_debug("Packet %s [Hello:RECV]: Options %s", | |
909 | inet_ntoa(ospfh->router_id), | |
910 | ospf_options_dump(hello->options)); | |
911 | ||
912 | /* Compare options. */ | |
718e3744 | 913 | #define REJECT_IF_TBIT_ON 1 /* XXX */ |
914 | #ifdef REJECT_IF_TBIT_ON | |
ac4d0be5 | 915 | if (CHECK_FLAG(hello->options, OSPF_OPTION_MT)) { |
916 | /* | |
917 | * This router does not support non-zero TOS. | |
918 | * Drop this Hello packet not to establish neighbor | |
919 | * relationship. | |
920 | */ | |
921 | zlog_warn("Packet %s [Hello:RECV]: T-bit on, drop it.", | |
922 | inet_ntoa(ospfh->router_id)); | |
923 | return; | |
924 | } | |
718e3744 | 925 | #endif /* REJECT_IF_TBIT_ON */ |
926 | ||
ac4d0be5 | 927 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
928 | && CHECK_FLAG(hello->options, OSPF_OPTION_O)) { | |
929 | /* | |
930 | * This router does know the correct usage of O-bit | |
931 | * the bit should be set in DD packet only. | |
932 | */ | |
933 | zlog_warn("Packet %s [Hello:RECV]: O-bit abuse?", | |
934 | inet_ntoa(ospfh->router_id)); | |
718e3744 | 935 | #ifdef STRICT_OBIT_USAGE_CHECK |
ac4d0be5 | 936 | return; /* Reject this packet. */ |
937 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
938 | UNSET_FLAG(hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
939 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
940 | } | |
718e3744 | 941 | |
ac4d0be5 | 942 | /* new for NSSA is to ensure that NP is on and E is off */ |
943 | ||
944 | if (oi->area->external_routing == OSPF_AREA_NSSA) { | |
945 | if (!(CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_NP) | |
946 | && CHECK_FLAG(hello->options, OSPF_OPTION_NP) | |
947 | && !CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_E) | |
948 | && !CHECK_FLAG(hello->options, OSPF_OPTION_E))) { | |
949 | zlog_warn( | |
950 | "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", | |
951 | inet_ntoa(ospfh->router_id), OPTIONS(oi), | |
952 | hello->options); | |
953 | return; | |
954 | } | |
955 | if (IS_DEBUG_OSPF_NSSA) | |
956 | zlog_debug("NSSA-Hello:RECV:Packet from %s:", | |
957 | inet_ntoa(ospfh->router_id)); | |
958 | } else | |
959 | /* The setting of the E-bit found in the Hello Packet's Options | |
960 | field must match this area's ExternalRoutingCapability A | |
961 | mismatch causes processing to stop and the packet to be | |
962 | dropped. The setting of the rest of the bits in the Hello | |
963 | Packet's Options field should be ignored. */ | |
964 | if (CHECK_FLAG(OPTIONS(oi), OSPF_OPTION_E) | |
965 | != CHECK_FLAG(hello->options, OSPF_OPTION_E)) { | |
966 | zlog_warn( | |
967 | "Packet %s [Hello:RECV]: my options: %x, his options %x", | |
968 | inet_ntoa(ospfh->router_id), OPTIONS(oi), | |
969 | hello->options); | |
970 | return; | |
971 | } | |
718e3744 | 972 | |
ac4d0be5 | 973 | /* get neighbour struct */ |
974 | nbr = ospf_nbr_get(oi, ospfh, iph, &p); | |
975 | ||
976 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
977 | assert(nbr); | |
978 | ||
979 | old_state = nbr->state; | |
980 | ||
981 | /* Add event to thread. */ | |
982 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
983 | ||
984 | /* RFC2328 Section 9.5.1 | |
985 | If the router is not eligible to become Designated Router, | |
986 | (snip) It must also send an Hello Packet in reply to an | |
987 | Hello Packet received from any eligible neighbor (other than | |
988 | the current Designated Router and Backup Designated Router). */ | |
989 | if (oi->type == OSPF_IFTYPE_NBMA) | |
990 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
991 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
992 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
993 | OSPF_NSM_TIMER_ON(nbr->t_hello_reply, | |
994 | ospf_hello_reply_timer, | |
995 | OSPF_HELLO_REPLY_DELAY); | |
996 | ||
997 | /* on NBMA network type, it happens to receive bidirectional Hello | |
998 | packet | |
999 | without advance 1-Way Received event. | |
1000 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
1001 | if (oi->type == OSPF_IFTYPE_NBMA | |
1002 | && (old_state == NSM_Down || old_state == NSM_Attempt)) { | |
1003 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_OneWayReceived); | |
1004 | nbr->priority = hello->priority; | |
1005 | nbr->d_router = hello->d_router; | |
1006 | nbr->bd_router = hello->bd_router; | |
1007 | return; | |
1008 | } | |
1009 | ||
1010 | if (ospf_nbr_bidirectional(&oi->ospf->router_id, hello->neighbors, | |
1011 | size - OSPF_HELLO_MIN_SIZE)) { | |
1012 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_TwoWayReceived); | |
1013 | nbr->options |= hello->options; | |
1014 | } else { | |
1015 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_OneWayReceived); | |
1016 | /* Set neighbor information. */ | |
1017 | nbr->priority = hello->priority; | |
1018 | nbr->d_router = hello->d_router; | |
1019 | nbr->bd_router = hello->bd_router; | |
1020 | return; | |
1021 | } | |
1022 | ||
1023 | /* If neighbor itself declares DR and no BDR exists, | |
1024 | cause event BackupSeen */ | |
1025 | if (IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->d_router)) | |
1026 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
1027 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_BackupSeen); | |
1028 | ||
1029 | /* neighbor itself declares BDR. */ | |
1030 | if (oi->state == ISM_Waiting | |
1031 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->bd_router)) | |
1032 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_BackupSeen); | |
1033 | ||
1034 | /* had not previously. */ | |
1035 | if ((IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->d_router) | |
1036 | && IPV4_ADDR_CMP(&nbr->address.u.prefix4, &nbr->d_router)) | |
1037 | || (IPV4_ADDR_CMP(&nbr->address.u.prefix4, &hello->d_router) | |
1038 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &nbr->d_router))) | |
1039 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1040 | ||
1041 | /* had not previously. */ | |
1042 | if ((IPV4_ADDR_SAME(&nbr->address.u.prefix4, &hello->bd_router) | |
1043 | && IPV4_ADDR_CMP(&nbr->address.u.prefix4, &nbr->bd_router)) | |
1044 | || (IPV4_ADDR_CMP(&nbr->address.u.prefix4, &hello->bd_router) | |
1045 | && IPV4_ADDR_SAME(&nbr->address.u.prefix4, &nbr->bd_router))) | |
1046 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1047 | ||
1048 | /* Neighbor priority check. */ | |
1049 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
1050 | OSPF_ISM_EVENT_SCHEDULE(oi, ISM_NeighborChange); | |
1051 | ||
1052 | /* Set neighbor information. */ | |
1053 | nbr->priority = hello->priority; | |
1054 | nbr->d_router = hello->d_router; | |
1055 | nbr->bd_router = hello->bd_router; | |
718e3744 | 1056 | } |
1057 | ||
1058 | /* Save DD flags/options/Seqnum received. */ | |
ac4d0be5 | 1059 | static void ospf_db_desc_save_current(struct ospf_neighbor *nbr, |
1060 | struct ospf_db_desc *dd) | |
718e3744 | 1061 | { |
ac4d0be5 | 1062 | nbr->last_recv.flags = dd->flags; |
1063 | nbr->last_recv.options = dd->options; | |
1064 | nbr->last_recv.dd_seqnum = ntohl(dd->dd_seqnum); | |
718e3744 | 1065 | } |
1066 | ||
1067 | /* Process rest of DD packet. */ | |
ac4d0be5 | 1068 | static void ospf_db_desc_proc(struct stream *s, struct ospf_interface *oi, |
1069 | struct ospf_neighbor *nbr, | |
1070 | struct ospf_db_desc *dd, u_int16_t size) | |
1071 | { | |
1072 | struct ospf_lsa *new, *find; | |
1073 | struct lsa_header *lsah; | |
1074 | ||
1075 | stream_forward_getp(s, OSPF_DB_DESC_MIN_SIZE); | |
1076 | for (size -= OSPF_DB_DESC_MIN_SIZE; size >= OSPF_LSA_HEADER_SIZE; | |
1077 | size -= OSPF_LSA_HEADER_SIZE) { | |
1078 | lsah = (struct lsa_header *)STREAM_PNT(s); | |
1079 | stream_forward_getp(s, OSPF_LSA_HEADER_SIZE); | |
1080 | ||
1081 | /* Unknown LS type. */ | |
1082 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) { | |
1083 | zlog_warn("Packet [DD:RECV]: Unknown LS type %d.", | |
1084 | lsah->type); | |
1085 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1086 | return; | |
1087 | } | |
1088 | ||
1089 | if (IS_OPAQUE_LSA(lsah->type) | |
1090 | && !CHECK_FLAG(nbr->options, OSPF_OPTION_O)) { | |
1091 | zlog_warn("LSA[Type%d:%s]: Opaque capability mismatch?", | |
1092 | lsah->type, inet_ntoa(lsah->id)); | |
1093 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1094 | return; | |
1095 | } | |
1096 | ||
1097 | switch (lsah->type) { | |
1098 | case OSPF_AS_EXTERNAL_LSA: | |
1099 | case OSPF_OPAQUE_AS_LSA: | |
1100 | /* Check for stub area. Reject if AS-External from stub | |
1101 | but | |
1102 | allow if from NSSA. */ | |
1103 | if (oi->area->external_routing == OSPF_AREA_STUB) { | |
1104 | zlog_warn( | |
1105 | "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", | |
1106 | lsah->type, inet_ntoa(lsah->id), | |
1107 | (oi->area->external_routing | |
1108 | == OSPF_AREA_STUB) | |
1109 | ? "STUB" | |
1110 | : "NSSA"); | |
1111 | OSPF_NSM_EVENT_SCHEDULE(nbr, | |
1112 | NSM_SeqNumberMismatch); | |
1113 | return; | |
1114 | } | |
1115 | break; | |
1116 | default: | |
1117 | break; | |
1118 | } | |
1119 | ||
1120 | /* Create LS-request object. */ | |
1121 | new = ospf_ls_request_new(lsah); | |
1122 | ||
1123 | /* Lookup received LSA, then add LS request list. */ | |
1124 | find = ospf_lsa_lookup_by_header(oi->area, lsah); | |
1125 | ||
1126 | /* ospf_lsa_more_recent is fine with NULL pointers */ | |
1127 | switch (ospf_lsa_more_recent(find, new)) { | |
1128 | case -1: | |
1129 | /* Neighbour has a more recent LSA, we must request it | |
1130 | */ | |
1131 | ospf_ls_request_add(nbr, new); | |
1132 | case 0: | |
1133 | /* If we have a copy of this LSA, it's either less | |
1134 | * recent | |
1135 | * and we're requesting it from neighbour (the case | |
1136 | * above), or | |
1137 | * it's as recent and we both have same copy (this | |
1138 | * case). | |
1139 | * | |
1140 | * In neither of these two cases is there any point in | |
1141 | * describing our copy of the LSA to the neighbour in a | |
1142 | * DB-Summary packet, if we're still intending to do so. | |
1143 | * | |
1144 | * See: draft-ogier-ospf-dbex-opt-00.txt, describing the | |
1145 | * backward compatible optimisation to OSPF DB Exchange | |
1146 | * / | |
1147 | * DB Description process implemented here. | |
1148 | */ | |
1149 | if (find) | |
1150 | ospf_lsdb_delete(&nbr->db_sum, find); | |
1151 | ospf_lsa_discard(new); | |
1152 | break; | |
1153 | default: | |
1154 | /* We have the more recent copy, nothing specific to do: | |
1155 | * - no need to request neighbours stale copy | |
1156 | * - must leave DB summary list copy alone | |
1157 | */ | |
1158 | if (IS_DEBUG_OSPF_EVENT) | |
1159 | zlog_debug( | |
1160 | "Packet [DD:RECV]: LSA received Type %d, " | |
1161 | "ID %s is not recent.", | |
1162 | lsah->type, inet_ntoa(lsah->id)); | |
1163 | ospf_lsa_discard(new); | |
1164 | } | |
1165 | } | |
1166 | ||
1167 | /* Master */ | |
1168 | if (IS_SET_DD_MS(nbr->dd_flags)) { | |
1169 | nbr->dd_seqnum++; | |
1170 | ||
1171 | /* Both sides have no More, then we're done with Exchange */ | |
1172 | if (!IS_SET_DD_M(dd->flags) && !IS_SET_DD_M(nbr->dd_flags)) | |
1173 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_ExchangeDone); | |
1174 | else | |
1175 | ospf_db_desc_send(nbr); | |
1176 | } | |
1177 | /* Slave */ | |
1178 | else { | |
1179 | nbr->dd_seqnum = ntohl(dd->dd_seqnum); | |
1180 | ||
1181 | /* Send DD packet in reply. | |
1182 | * | |
1183 | * Must be done to acknowledge the Master's DD, regardless of | |
1184 | * whether we have more LSAs ourselves to describe. | |
1185 | * | |
1186 | * This function will clear the 'More' bit, if after this DD | |
1187 | * we have no more LSAs to describe to the master.. | |
1188 | */ | |
1189 | ospf_db_desc_send(nbr); | |
1190 | ||
1191 | /* Slave can raise ExchangeDone now, if master is also done */ | |
1192 | if (!IS_SET_DD_M(dd->flags) && !IS_SET_DD_M(nbr->dd_flags)) | |
1193 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_ExchangeDone); | |
1194 | } | |
1195 | ||
1196 | /* Save received neighbor values from DD. */ | |
1197 | ospf_db_desc_save_current(nbr, dd); | |
1198 | ||
1199 | if (!nbr->t_ls_req) | |
1200 | ospf_ls_req_send(nbr); | |
1201 | } | |
1202 | ||
1203 | static int ospf_db_desc_is_dup(struct ospf_db_desc *dd, | |
1204 | struct ospf_neighbor *nbr) | |
1205 | { | |
1206 | /* Is DD duplicated? */ | |
1207 | if (dd->options == nbr->last_recv.options | |
1208 | && dd->flags == nbr->last_recv.flags | |
1209 | && dd->dd_seqnum == htonl(nbr->last_recv.dd_seqnum)) | |
1210 | return 1; | |
1211 | ||
1212 | return 0; | |
718e3744 | 1213 | } |
1214 | ||
1215 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
ac4d0be5 | 1216 | static void ospf_db_desc(struct ip *iph, struct ospf_header *ospfh, |
1217 | struct stream *s, struct ospf_interface *oi, | |
1218 | u_int16_t size) | |
1219 | { | |
1220 | struct ospf_db_desc *dd; | |
1221 | struct ospf_neighbor *nbr; | |
d363df2c | 1222 | |
ac4d0be5 | 1223 | /* Increment statistics. */ |
1224 | oi->db_desc_in++; | |
718e3744 | 1225 | |
ac4d0be5 | 1226 | dd = (struct ospf_db_desc *)STREAM_PNT(s); |
1227 | ||
1228 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1229 | if (nbr == NULL) { | |
1230 | zlog_warn("Packet[DD]: Unknown Neighbor %s", | |
1231 | inet_ntoa(ospfh->router_id)); | |
1232 | return; | |
718e3744 | 1233 | } |
ac4d0be5 | 1234 | |
1235 | /* Check MTU. */ | |
1236 | if ((OSPF_IF_PARAM(oi, mtu_ignore) == 0) | |
1237 | && (ntohs(dd->mtu) > oi->ifp->mtu)) { | |
1238 | zlog_warn( | |
1239 | "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", | |
1240 | inet_ntoa(nbr->router_id), ntohs(dd->mtu), IF_NAME(oi), | |
1241 | oi->ifp->mtu); | |
1242 | return; | |
718e3744 | 1243 | } |
1244 | ||
ac4d0be5 | 1245 | /* |
1246 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is | |
1247 | * not | |
1248 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1249 | * Until proper solution is developped, this hack should help. | |
1250 | * | |
1251 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1252 | * options, unfortunately its use in DD options is not specified. Hence | |
1253 | * some | |
1254 | * implementations follow E-bit semantics and set it in DD options, and | |
1255 | * some | |
1256 | * treat it as unspecified and hence follow the directive "default for | |
1257 | * options is clear", ie unset. | |
1258 | * | |
1259 | * Reset the flag, as ospfd follows E-bit semantics. | |
1260 | */ | |
1261 | if ((oi->area->external_routing == OSPF_AREA_NSSA) | |
1262 | && (CHECK_FLAG(nbr->options, OSPF_OPTION_NP)) | |
1263 | && (!CHECK_FLAG(dd->options, OSPF_OPTION_NP))) { | |
1264 | if (IS_DEBUG_OSPF_EVENT) | |
1265 | zlog_debug( | |
1266 | "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", | |
1267 | inet_ntoa(nbr->router_id)); | |
1268 | SET_FLAG(dd->options, OSPF_OPTION_NP); | |
718e3744 | 1269 | } |
1270 | ||
ac4d0be5 | 1271 | #ifdef REJECT_IF_TBIT_ON |
1272 | if (CHECK_FLAG(dd->options, OSPF_OPTION_MT)) { | |
1273 | /* | |
1274 | * In Hello protocol, optional capability must have checked | |
1275 | * to prevent this T-bit enabled router be my neighbor. | |
1276 | */ | |
1277 | zlog_warn("Packet[DD]: Neighbor %s: T-bit on?", | |
1278 | inet_ntoa(nbr->router_id)); | |
1279 | return; | |
1280 | } | |
1281 | #endif /* REJECT_IF_TBIT_ON */ | |
1282 | ||
1283 | if (CHECK_FLAG(dd->options, OSPF_OPTION_O) | |
1284 | && !CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) { | |
1285 | /* | |
1286 | * This node is not configured to handle O-bit, for now. | |
1287 | * Clear it to ignore unsupported capability proposed by | |
1288 | * neighbor. | |
1289 | */ | |
1290 | UNSET_FLAG(dd->options, OSPF_OPTION_O); | |
1291 | } | |
1292 | ||
1293 | /* Add event to thread. */ | |
1294 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1295 | ||
1296 | /* Process DD packet by neighbor status. */ | |
1297 | switch (nbr->state) { | |
1298 | case NSM_Down: | |
1299 | case NSM_Attempt: | |
1300 | case NSM_TwoWay: | |
1301 | zlog_warn( | |
1302 | "Packet[DD]: Neighbor %s state is %s, packet discarded.", | |
1303 | inet_ntoa(nbr->router_id), | |
1304 | lookup_msg(ospf_nsm_state_msg, nbr->state, NULL)); | |
1305 | break; | |
1306 | case NSM_Init: | |
1307 | OSPF_NSM_EVENT_EXECUTE(nbr, NSM_TwoWayReceived); | |
1308 | /* If the new state is ExStart, the processing of the current | |
1309 | packet should then continue in this new state by falling | |
1310 | through to case ExStart below. */ | |
1311 | if (nbr->state != NSM_ExStart) | |
1312 | break; | |
1313 | case NSM_ExStart: | |
1314 | /* Initial DBD */ | |
1315 | if ((IS_SET_DD_ALL(dd->flags) == OSPF_DD_FLAG_ALL) | |
1316 | && (size == OSPF_DB_DESC_MIN_SIZE)) { | |
1317 | if (IPV4_ADDR_CMP(&nbr->router_id, &oi->ospf->router_id) | |
1318 | > 0) { | |
1319 | /* We're Slave---obey */ | |
1320 | zlog_info( | |
1321 | "Packet[DD]: Neighbor %s Negotiation done (Slave).", | |
1322 | inet_ntoa(nbr->router_id)); | |
1323 | nbr->dd_seqnum = ntohl(dd->dd_seqnum); | |
1324 | ||
1325 | /* Reset I/MS */ | |
1326 | UNSET_FLAG(nbr->dd_flags, | |
1327 | (OSPF_DD_FLAG_MS | OSPF_DD_FLAG_I)); | |
1328 | } else { | |
1329 | /* We're Master, ignore the initial DBD from | |
1330 | * Slave */ | |
1331 | zlog_info( | |
1332 | "Packet[DD]: Neighbor %s: Initial DBD from Slave, " | |
1333 | "ignoring.", | |
1334 | inet_ntoa(nbr->router_id)); | |
1335 | break; | |
1336 | } | |
1337 | } | |
1338 | /* Ack from the Slave */ | |
1339 | else if (!IS_SET_DD_MS(dd->flags) && !IS_SET_DD_I(dd->flags) | |
1340 | && ntohl(dd->dd_seqnum) == nbr->dd_seqnum | |
1341 | && IPV4_ADDR_CMP(&nbr->router_id, &oi->ospf->router_id) | |
1342 | < 0) { | |
1343 | zlog_info( | |
1344 | "Packet[DD]: Neighbor %s Negotiation done (Master).", | |
1345 | inet_ntoa(nbr->router_id)); | |
1346 | /* Reset I, leaving MS */ | |
1347 | UNSET_FLAG(nbr->dd_flags, OSPF_DD_FLAG_I); | |
1348 | } else { | |
1349 | zlog_warn("Packet[DD]: Neighbor %s Negotiation fails.", | |
1350 | inet_ntoa(nbr->router_id)); | |
1351 | break; | |
1352 | } | |
1353 | ||
1354 | /* This is where the real Options are saved */ | |
1355 | nbr->options = dd->options; | |
1356 | ||
1357 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) { | |
1358 | if (IS_DEBUG_OSPF_EVENT) | |
1359 | zlog_debug( | |
1360 | "Neighbor[%s] is %sOpaque-capable.", | |
1361 | inet_ntoa(nbr->router_id), | |
1362 | CHECK_FLAG(nbr->options, OSPF_OPTION_O) | |
1363 | ? "" | |
1364 | : "NOT "); | |
1365 | ||
1366 | if (!CHECK_FLAG(nbr->options, OSPF_OPTION_O) | |
1367 | && IPV4_ADDR_SAME(&DR(oi), | |
1368 | &nbr->address.u.prefix4)) { | |
1369 | zlog_warn( | |
1370 | "DR-neighbor[%s] is NOT opaque-capable; " | |
1371 | "Opaque-LSAs cannot be reliably advertised " | |
1372 | "in this network.", | |
1373 | inet_ntoa(nbr->router_id)); | |
1374 | /* This situation is undesirable, but not a real | |
1375 | * error. */ | |
1376 | } | |
1377 | } | |
1378 | ||
1379 | OSPF_NSM_EVENT_EXECUTE(nbr, NSM_NegotiationDone); | |
1380 | ||
1381 | /* continue processing rest of packet. */ | |
1382 | ospf_db_desc_proc(s, oi, nbr, dd, size); | |
1383 | break; | |
1384 | case NSM_Exchange: | |
1385 | if (ospf_db_desc_is_dup(dd, nbr)) { | |
1386 | if (IS_SET_DD_MS(nbr->dd_flags)) | |
1387 | /* Master: discard duplicated DD packet. */ | |
1388 | zlog_info( | |
1389 | "Packet[DD] (Master): Neighbor %s packet duplicated.", | |
1390 | inet_ntoa(nbr->router_id)); | |
1391 | else | |
1392 | /* Slave: cause to retransmit the last Database | |
1393 | Description. */ | |
1394 | { | |
1395 | zlog_info( | |
1396 | "Packet[DD] [Slave]: Neighbor %s packet duplicated.", | |
1397 | inet_ntoa(nbr->router_id)); | |
1398 | ospf_db_desc_resend(nbr); | |
1399 | } | |
1400 | break; | |
1401 | } | |
1402 | ||
1403 | /* Otherwise DD packet should be checked. */ | |
1404 | /* Check Master/Slave bit mismatch */ | |
1405 | if (IS_SET_DD_MS(dd->flags) | |
1406 | != IS_SET_DD_MS(nbr->last_recv.flags)) { | |
1407 | zlog_warn("Packet[DD]: Neighbor %s MS-bit mismatch.", | |
1408 | inet_ntoa(nbr->router_id)); | |
1409 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1410 | if (IS_DEBUG_OSPF_EVENT) | |
1411 | zlog_debug( | |
1412 | "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", | |
1413 | dd->flags, nbr->dd_flags); | |
1414 | break; | |
1415 | } | |
1416 | ||
1417 | /* Check initialize bit is set. */ | |
1418 | if (IS_SET_DD_I(dd->flags)) { | |
1419 | zlog_info("Packet[DD]: Neighbor %s I-bit set.", | |
1420 | inet_ntoa(nbr->router_id)); | |
1421 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1422 | break; | |
1423 | } | |
1424 | ||
1425 | /* Check DD Options. */ | |
1426 | if (dd->options != nbr->options) { | |
718e3744 | 1427 | #ifdef ORIGINAL_CODING |
ac4d0be5 | 1428 | /* Save the new options for debugging */ |
1429 | nbr->options = dd->options; | |
718e3744 | 1430 | #endif /* ORIGINAL_CODING */ |
ac4d0be5 | 1431 | zlog_warn("Packet[DD]: Neighbor %s options mismatch.", |
1432 | inet_ntoa(nbr->router_id)); | |
1433 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1434 | break; | |
1435 | } | |
718e3744 | 1436 | |
ac4d0be5 | 1437 | /* Check DD sequence number. */ |
1438 | if ((IS_SET_DD_MS(nbr->dd_flags) | |
1439 | && ntohl(dd->dd_seqnum) != nbr->dd_seqnum) | |
1440 | || (!IS_SET_DD_MS(nbr->dd_flags) | |
1441 | && ntohl(dd->dd_seqnum) != nbr->dd_seqnum + 1)) { | |
1442 | zlog_warn( | |
1443 | "Packet[DD]: Neighbor %s sequence number mismatch.", | |
1444 | inet_ntoa(nbr->router_id)); | |
1445 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1446 | break; | |
718e3744 | 1447 | } |
718e3744 | 1448 | |
ac4d0be5 | 1449 | /* Continue processing rest of packet. */ |
1450 | ospf_db_desc_proc(s, oi, nbr, dd, size); | |
1451 | break; | |
1452 | case NSM_Loading: | |
1453 | case NSM_Full: | |
1454 | if (ospf_db_desc_is_dup(dd, nbr)) { | |
1455 | if (IS_SET_DD_MS(nbr->dd_flags)) { | |
1456 | /* Master should discard duplicate DD packet. */ | |
1457 | zlog_info( | |
1458 | "Packet[DD]: Neighbor %s duplicated, " | |
1459 | "packet discarded.", | |
1460 | inet_ntoa(nbr->router_id)); | |
1461 | break; | |
1462 | } else { | |
1463 | if (monotime_since(&nbr->last_send_ts, NULL) | |
1464 | < nbr->v_inactivity * 1000000LL) { | |
1465 | /* In states Loading and Full the slave | |
1466 | must resend | |
1467 | its last Database Description packet | |
1468 | in response to | |
1469 | duplicate Database Description | |
1470 | packets received | |
1471 | from the master. For this reason the | |
1472 | slave must | |
1473 | wait RouterDeadInterval seconds | |
1474 | before freeing the | |
1475 | last Database Description packet. | |
1476 | Reception of a | |
1477 | Database Description packet from the | |
1478 | master after | |
1479 | this interval will generate a | |
1480 | SeqNumberMismatch | |
1481 | neighbor event. RFC2328 Section 10.8 | |
1482 | */ | |
1483 | ospf_db_desc_resend(nbr); | |
1484 | break; | |
1485 | } | |
1486 | } | |
1487 | } | |
1488 | ||
1489 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch); | |
1490 | break; | |
1491 | default: | |
1492 | zlog_warn("Packet[DD]: Neighbor %s NSM illegal status %u.", | |
1493 | inet_ntoa(nbr->router_id), nbr->state); | |
1494 | break; | |
1495 | } | |
718e3744 | 1496 | } |
1497 | ||
1498 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1499 | ||
1500 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
ac4d0be5 | 1501 | static void ospf_ls_req(struct ip *iph, struct ospf_header *ospfh, |
1502 | struct stream *s, struct ospf_interface *oi, | |
1503 | u_int16_t size) | |
1504 | { | |
1505 | struct ospf_neighbor *nbr; | |
1506 | u_int32_t ls_type; | |
1507 | struct in_addr ls_id; | |
1508 | struct in_addr adv_router; | |
1509 | struct ospf_lsa *find; | |
1510 | struct list *ls_upd; | |
1511 | unsigned int length; | |
1512 | ||
1513 | /* Increment statistics. */ | |
1514 | oi->ls_req_in++; | |
1515 | ||
1516 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1517 | if (nbr == NULL) { | |
1518 | zlog_warn("Link State Request: Unknown Neighbor %s.", | |
1519 | inet_ntoa(ospfh->router_id)); | |
1520 | return; | |
718e3744 | 1521 | } |
1522 | ||
ac4d0be5 | 1523 | /* Add event to thread. */ |
1524 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1525 | ||
1526 | /* Neighbor State should be Exchange or later. */ | |
1527 | if (nbr->state != NSM_Exchange && nbr->state != NSM_Loading | |
1528 | && nbr->state != NSM_Full) { | |
1529 | zlog_warn( | |
1530 | "Link State Request received from %s: " | |
1531 | "Neighbor state is %s, packet discarded.", | |
1532 | inet_ntoa(ospfh->router_id), | |
1533 | lookup_msg(ospf_nsm_state_msg, nbr->state, NULL)); | |
1534 | return; | |
718e3744 | 1535 | } |
1536 | ||
ac4d0be5 | 1537 | /* Send Link State Update for ALL requested LSAs. */ |
1538 | ls_upd = list_new(); | |
1539 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1540 | ||
1541 | while (size >= OSPF_LSA_KEY_SIZE) { | |
1542 | /* Get one slice of Link State Request. */ | |
1543 | ls_type = stream_getl(s); | |
1544 | ls_id.s_addr = stream_get_ipv4(s); | |
1545 | adv_router.s_addr = stream_get_ipv4(s); | |
1546 | ||
1547 | /* Verify LSA type. */ | |
1548 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) { | |
1549 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
1550 | list_delete(ls_upd); | |
1551 | return; | |
1552 | } | |
718e3744 | 1553 | |
ac4d0be5 | 1554 | /* Search proper LSA in LSDB. */ |
1555 | find = ospf_lsa_lookup(oi->area, ls_type, ls_id, adv_router); | |
1556 | if (find == NULL) { | |
1557 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
1558 | list_delete(ls_upd); | |
1559 | return; | |
1560 | } | |
718e3744 | 1561 | |
ac4d0be5 | 1562 | /* Packet overflows MTU size, send immediately. */ |
1563 | if (length + ntohs(find->data->length) > ospf_packet_max(oi)) { | |
1564 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1565 | ospf_ls_upd_send(nbr, ls_upd, | |
1566 | OSPF_SEND_PACKET_DIRECT); | |
1567 | else | |
1568 | ospf_ls_upd_send(nbr, ls_upd, | |
1569 | OSPF_SEND_PACKET_INDIRECT); | |
1570 | ||
1571 | /* Only remove list contents. Keep ls_upd. */ | |
1572 | list_delete_all_node(ls_upd); | |
1573 | ||
1574 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1575 | } | |
718e3744 | 1576 | |
ac4d0be5 | 1577 | /* Append LSA to update list. */ |
1578 | listnode_add(ls_upd, find); | |
1579 | length += ntohs(find->data->length); | |
718e3744 | 1580 | |
ac4d0be5 | 1581 | size -= OSPF_LSA_KEY_SIZE; |
1582 | } | |
718e3744 | 1583 | |
ac4d0be5 | 1584 | /* Send rest of Link State Update. */ |
1585 | if (listcount(ls_upd) > 0) { | |
1586 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1587 | ospf_ls_upd_send(nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1588 | else | |
1589 | ospf_ls_upd_send(nbr, ls_upd, | |
1590 | OSPF_SEND_PACKET_INDIRECT); | |
718e3744 | 1591 | |
ac4d0be5 | 1592 | list_delete(ls_upd); |
1593 | } else | |
1594 | list_free(ls_upd); | |
718e3744 | 1595 | } |
1596 | ||
1597 | /* Get the list of LSAs from Link State Update packet. | |
1598 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
ac4d0be5 | 1599 | static struct list *ospf_ls_upd_list_lsa(struct ospf_neighbor *nbr, |
1600 | struct stream *s, | |
1601 | struct ospf_interface *oi, size_t size) | |
1602 | { | |
1603 | u_int16_t count, sum; | |
1604 | u_int32_t length; | |
1605 | struct lsa_header *lsah; | |
1606 | struct ospf_lsa *lsa; | |
1607 | struct list *lsas; | |
1608 | ||
1609 | lsas = list_new(); | |
1610 | ||
1611 | count = stream_getl(s); | |
1612 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1613 | ||
1614 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
1615 | size -= length, stream_forward_getp(s, length), count--) { | |
1616 | lsah = (struct lsa_header *)STREAM_PNT(s); | |
1617 | length = ntohs(lsah->length); | |
1618 | ||
1619 | if (length > size) { | |
1620 | zlog_warn( | |
1621 | "Link State Update: LSA length exceeds packet size."); | |
1622 | break; | |
1623 | } | |
718e3744 | 1624 | |
ac4d0be5 | 1625 | /* Validate the LSA's LS checksum. */ |
1626 | sum = lsah->checksum; | |
1627 | if (!ospf_lsa_checksum_valid(lsah)) { | |
1628 | /* (bug #685) more details in a one-line message make it | |
1629 | * possible | |
1630 | * to identify problem source on the one hand and to | |
1631 | * have a better | |
1632 | * chance to compress repeated messages in syslog on the | |
1633 | * other */ | |
1634 | zlog_warn( | |
1635 | "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s", | |
1636 | sum, lsah->checksum, inet_ntoa(lsah->id), | |
1637 | inet_ntoa(nbr->src), inet_ntoa(nbr->router_id), | |
1638 | inet_ntoa(lsah->adv_router)); | |
1639 | continue; | |
1640 | } | |
718e3744 | 1641 | |
ac4d0be5 | 1642 | /* Examine the LSA's LS type. */ |
1643 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) { | |
1644 | zlog_warn("Link State Update: Unknown LS type %d", | |
1645 | lsah->type); | |
1646 | continue; | |
1647 | } | |
718e3744 | 1648 | |
ac4d0be5 | 1649 | /* |
1650 | * What if the received LSA's age is greater than MaxAge? | |
1651 | * Treat it as a MaxAge case -- endo. | |
1652 | */ | |
1653 | if (ntohs(lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1654 | lsah->ls_age = htons(OSPF_LSA_MAXAGE); | |
718e3744 | 1655 | |
ac4d0be5 | 1656 | if (CHECK_FLAG(nbr->options, OSPF_OPTION_O)) { |
1657 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1658 | if ((IS_OPAQUE_LSA(lsah->type) | |
1659 | && !CHECK_FLAG(lsah->options, OSPF_OPTION_O)) | |
1660 | || (!IS_OPAQUE_LSA(lsah->type) | |
1661 | && CHECK_FLAG(lsah->options, OSPF_OPTION_O))) { | |
1662 | /* | |
1663 | * This neighbor must know the exact usage of | |
1664 | * O-bit; | |
1665 | * the bit will be set in Type-9,10,11 LSAs | |
1666 | * only. | |
1667 | */ | |
1668 | zlog_warn("LSA[Type%d:%s]: O-bit abuse?", | |
1669 | lsah->type, inet_ntoa(lsah->id)); | |
1670 | continue; | |
1671 | } | |
1672 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
718e3744 | 1673 | |
ac4d0be5 | 1674 | /* Do not take in AS External Opaque-LSAs if we are a |
1675 | * stub. */ | |
1676 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1677 | && nbr->oi->area->external_routing | |
1678 | != OSPF_AREA_DEFAULT) { | |
1679 | if (IS_DEBUG_OSPF_EVENT) | |
1680 | zlog_debug( | |
1681 | "LSA[Type%d:%s]: We are a stub, don't take this LSA.", | |
1682 | lsah->type, | |
1683 | inet_ntoa(lsah->id)); | |
1684 | continue; | |
1685 | } | |
1686 | } else if (IS_OPAQUE_LSA(lsah->type)) { | |
1687 | zlog_warn("LSA[Type%d:%s]: Opaque capability mismatch?", | |
1688 | lsah->type, inet_ntoa(lsah->id)); | |
1689 | continue; | |
1690 | } | |
718e3744 | 1691 | |
ac4d0be5 | 1692 | /* Create OSPF LSA instance. */ |
1693 | lsa = ospf_lsa_new(); | |
1694 | ||
1695 | /* We may wish to put some error checking if type NSSA comes in | |
1696 | and area not in NSSA mode */ | |
1697 | switch (lsah->type) { | |
1698 | case OSPF_AS_EXTERNAL_LSA: | |
1699 | case OSPF_OPAQUE_AS_LSA: | |
1700 | lsa->area = NULL; | |
1701 | break; | |
1702 | case OSPF_OPAQUE_LINK_LSA: | |
1703 | lsa->oi = oi; /* Remember incoming interface for | |
1704 | flooding control. */ | |
1705 | /* Fallthrough */ | |
1706 | default: | |
1707 | lsa->area = oi->area; | |
1708 | break; | |
1709 | } | |
718e3744 | 1710 | |
ac4d0be5 | 1711 | lsa->data = ospf_lsa_data_new(length); |
1712 | memcpy(lsa->data, lsah, length); | |
1713 | ||
1714 | if (IS_DEBUG_OSPF_EVENT) | |
1715 | zlog_debug( | |
1716 | "LSA[Type%d:%s]: %p new LSA created with Link State Update", | |
1717 | lsa->data->type, inet_ntoa(lsa->data->id), | |
1718 | (void *)lsa); | |
1719 | listnode_add(lsas, lsa); | |
1720 | } | |
718e3744 | 1721 | |
ac4d0be5 | 1722 | return lsas; |
718e3744 | 1723 | } |
1724 | ||
1725 | /* Cleanup Update list. */ | |
ac4d0be5 | 1726 | static void ospf_upd_list_clean(struct list *lsas) |
718e3744 | 1727 | { |
ac4d0be5 | 1728 | struct listnode *node, *nnode; |
1729 | struct ospf_lsa *lsa; | |
718e3744 | 1730 | |
ac4d0be5 | 1731 | for (ALL_LIST_ELEMENTS(lsas, node, nnode, lsa)) |
1732 | ospf_lsa_discard(lsa); | |
718e3744 | 1733 | |
ac4d0be5 | 1734 | list_delete(lsas); |
718e3744 | 1735 | } |
1736 | ||
1737 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
ac4d0be5 | 1738 | static void ospf_ls_upd(struct ospf *ospf, struct ip *iph, |
1739 | struct ospf_header *ospfh, struct stream *s, | |
1740 | struct ospf_interface *oi, u_int16_t size) | |
1741 | { | |
1742 | struct ospf_neighbor *nbr; | |
1743 | struct list *lsas; | |
1744 | struct listnode *node, *nnode; | |
1745 | struct ospf_lsa *lsa = NULL; | |
1746 | /* unsigned long ls_req_found = 0; */ | |
1747 | ||
1748 | /* Dis-assemble the stream, update each entry, re-encapsulate for | |
1749 | * flooding */ | |
1750 | ||
1751 | /* Increment statistics. */ | |
1752 | oi->ls_upd_in++; | |
1753 | ||
1754 | /* Check neighbor. */ | |
1755 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
1756 | if (nbr == NULL) { | |
1757 | zlog_warn("Link State Update: Unknown Neighbor %s on int: %s", | |
1758 | inet_ntoa(ospfh->router_id), IF_NAME(oi)); | |
1759 | return; | |
718e3744 | 1760 | } |
1761 | ||
ac4d0be5 | 1762 | /* Add event to thread. */ |
1763 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
1764 | ||
1765 | /* Check neighbor state. */ | |
1766 | if (nbr->state < NSM_Exchange) { | |
1767 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
1768 | zlog_debug( | |
1769 | "Link State Update: " | |
1770 | "Neighbor[%s] state %s is less than Exchange", | |
1771 | inet_ntoa(ospfh->router_id), | |
1772 | lookup_msg(ospf_nsm_state_msg, nbr->state, | |
1773 | NULL)); | |
1774 | return; | |
1775 | } | |
718e3744 | 1776 | |
ac4d0be5 | 1777 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages |
1778 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1779 | * of section 13. | |
1780 | */ | |
1781 | lsas = ospf_ls_upd_list_lsa(nbr, s, oi, size); | |
1782 | ||
1783 | #define DISCARD_LSA(L, N) \ | |
1784 | { \ | |
1785 | if (IS_DEBUG_OSPF_EVENT) \ | |
1786 | zlog_debug( \ | |
1787 | "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \ | |
1788 | " Type-%d", \ | |
1789 | N, (void *)lsa, (int)lsa->data->type); \ | |
1790 | ospf_lsa_discard(L); \ | |
1791 | continue; \ | |
718e3744 | 1792 | } |
1793 | ||
ac4d0be5 | 1794 | /* Process each LSA received in the one packet. |
1795 | * | |
1796 | * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding | |
1797 | * text below are from the steps in RFC 2328, Section 13. | |
1798 | */ | |
1799 | for (ALL_LIST_ELEMENTS(lsas, node, nnode, lsa)) { | |
1800 | struct ospf_lsa *ls_ret, *current; | |
1801 | int ret = 1; | |
1802 | ||
1803 | if (IS_DEBUG_OSPF_NSSA) { | |
1804 | char buf1[INET_ADDRSTRLEN]; | |
1805 | char buf2[INET_ADDRSTRLEN]; | |
1806 | char buf3[INET_ADDRSTRLEN]; | |
1807 | ||
1808 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", | |
1809 | lsa->data->type, | |
1810 | inet_ntop(AF_INET, &ospfh->router_id, buf1, | |
1811 | INET_ADDRSTRLEN), | |
1812 | inet_ntop(AF_INET, &lsa->data->id, buf2, | |
1813 | INET_ADDRSTRLEN), | |
1814 | inet_ntop(AF_INET, &lsa->data->adv_router, | |
1815 | buf3, INET_ADDRSTRLEN)); | |
1816 | } | |
718e3744 | 1817 | |
ac4d0be5 | 1818 | listnode_delete(lsas, |
1819 | lsa); /* We don't need it in list anymore */ | |
1820 | ||
1821 | /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa() | |
1822 | */ | |
1823 | ||
1824 | /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */ | |
1825 | ||
1826 | /* (3) Do not take in AS External LSAs if we are a stub or NSSA. | |
1827 | */ | |
1828 | ||
1829 | /* Do not take in AS NSSA if this neighbor and we are not NSSA | |
1830 | */ | |
1831 | ||
1832 | /* Do take in Type-7's if we are an NSSA */ | |
1833 | ||
1834 | /* If we are also an ABR, later translate them to a Type-5 | |
1835 | * packet */ | |
1836 | ||
1837 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1838 | translate them to a separate Type-5 packet. */ | |
1839 | ||
1840 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1841 | /* Reject from STUB or NSSA */ | |
1842 | if (nbr->oi->area->external_routing | |
1843 | != OSPF_AREA_DEFAULT) { | |
1844 | if (IS_DEBUG_OSPF_NSSA) | |
1845 | zlog_debug( | |
1846 | "Incoming External LSA Discarded: We are NSSA/STUB Area"); | |
1847 | DISCARD_LSA(lsa, 1); | |
1848 | } | |
1849 | ||
1850 | if (lsa->data->type == OSPF_AS_NSSA_LSA) | |
1851 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) { | |
1852 | if (IS_DEBUG_OSPF_NSSA) | |
1853 | zlog_debug( | |
1854 | "Incoming NSSA LSA Discarded: Not NSSA Area"); | |
1855 | DISCARD_LSA(lsa, 2); | |
1856 | } | |
1857 | ||
1858 | /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */ | |
1859 | if (lsa->data->type == OSPF_ROUTER_LSA) | |
1860 | if (!IPV4_ADDR_SAME(&lsa->data->id, | |
1861 | &lsa->data->adv_router)) { | |
1862 | char buf1[INET_ADDRSTRLEN]; | |
1863 | char buf2[INET_ADDRSTRLEN]; | |
1864 | char buf3[INET_ADDRSTRLEN]; | |
1865 | ||
1866 | zlog_err( | |
1867 | "Incoming Router-LSA from %s with " | |
1868 | "Adv-ID[%s] != LS-ID[%s]", | |
1869 | inet_ntop(AF_INET, &ospfh->router_id, | |
1870 | buf1, INET_ADDRSTRLEN), | |
1871 | inet_ntop(AF_INET, &lsa->data->id, buf2, | |
1872 | INET_ADDRSTRLEN), | |
1873 | inet_ntop(AF_INET, | |
1874 | &lsa->data->adv_router, buf3, | |
1875 | INET_ADDRSTRLEN)); | |
1876 | zlog_err( | |
1877 | "OSPF domain compromised by attack or corruption. " | |
1878 | "Verify correct operation of -ALL- OSPF routers."); | |
1879 | DISCARD_LSA(lsa, 0); | |
1880 | } | |
1881 | ||
1882 | /* Find the LSA in the current database. */ | |
1883 | ||
1884 | current = ospf_lsa_lookup_by_header(oi->area, lsa->data); | |
1885 | ||
1886 | /* (4) If the LSA's LS age is equal to MaxAge, and there is | |
1887 | currently | |
1888 | no instance of the LSA in the router's link state database, | |
1889 | and none of router's neighbors are in states Exchange or | |
1890 | Loading, | |
1891 | then take the following actions: */ | |
1892 | ||
1893 | if (IS_LSA_MAXAGE(lsa) && !current | |
1894 | && ospf_check_nbr_status(oi->ospf)) { | |
1895 | /* (4a) Response Link State Acknowledgment. */ | |
1896 | ospf_ls_ack_send(nbr, lsa); | |
1897 | ||
1898 | /* (4b) Discard LSA. */ | |
1899 | if (IS_DEBUG_OSPF(lsa, LSA)) { | |
1900 | zlog_debug( | |
1901 | "Link State Update[%s]: LS age is equal to MaxAge.", | |
1902 | dump_lsa_key(lsa)); | |
1903 | } | |
1904 | DISCARD_LSA(lsa, 3); | |
1905 | } | |
1906 | ||
1907 | if (IS_OPAQUE_LSA(lsa->data->type) | |
1908 | && IPV4_ADDR_SAME(&lsa->data->adv_router, | |
1909 | &oi->ospf->router_id)) { | |
1910 | /* | |
1911 | * Even if initial flushing seems to be completed, there | |
1912 | * might | |
1913 | * be a case that self-originated LSA with MaxAge still | |
1914 | * remain | |
1915 | * in the routing domain. | |
1916 | * Just send an LSAck message to cease retransmission. | |
1917 | */ | |
1918 | if (IS_LSA_MAXAGE(lsa)) { | |
1919 | zlog_warn("LSA[%s]: Boomerang effect?", | |
1920 | dump_lsa_key(lsa)); | |
1921 | ospf_ls_ack_send(nbr, lsa); | |
1922 | ospf_lsa_discard(lsa); | |
1923 | ||
1924 | if (current != NULL && !IS_LSA_MAXAGE(current)) | |
1925 | ospf_opaque_lsa_refresh_schedule( | |
1926 | current); | |
1927 | continue; | |
1928 | } | |
1929 | ||
1930 | /* | |
1931 | * If an instance of self-originated Opaque-LSA is not | |
1932 | * found | |
1933 | * in the LSDB, there are some possible cases here. | |
1934 | * | |
1935 | * 1) This node lost opaque-capability after restart. | |
1936 | * 2) Else, a part of opaque-type is no more supported. | |
1937 | * 3) Else, a part of opaque-id is no more supported. | |
1938 | * | |
1939 | * Anyway, it is still this node's responsibility to | |
1940 | * flush it. | |
1941 | * Otherwise, the LSA instance remains in the routing | |
1942 | * domain | |
1943 | * until its age reaches to MaxAge. | |
1944 | */ | |
1945 | /* XXX: We should deal with this for *ALL* LSAs, not | |
1946 | * just opaque */ | |
1947 | if (current == NULL) { | |
1948 | if (IS_DEBUG_OSPF_EVENT) | |
1949 | zlog_debug( | |
1950 | "LSA[%s]: Previously originated Opaque-LSA," | |
1951 | "not found in the LSDB.", | |
1952 | dump_lsa_key(lsa)); | |
1953 | ||
1954 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
1955 | ||
1956 | ospf_opaque_self_originated_lsa_received(nbr, | |
1957 | lsa); | |
1958 | ospf_ls_ack_send(nbr, lsa); | |
1959 | ||
1960 | continue; | |
1961 | } | |
1962 | } | |
1963 | ||
1964 | /* It might be happen that received LSA is self-originated | |
1965 | * network LSA, but | |
1966 | * router ID is changed. So, we should check if LSA is a | |
1967 | * network-LSA whose | |
1968 | * Link State ID is one of the router's own IP interface | |
1969 | * addresses but whose | |
1970 | * Advertising Router is not equal to the router's own Router ID | |
1971 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be | |
1972 | * flushed. | |
1973 | */ | |
1974 | ||
1975 | if (lsa->data->type == OSPF_NETWORK_LSA) { | |
1976 | struct listnode *oinode, *oinnode; | |
1977 | struct ospf_interface *out_if; | |
1978 | int Flag = 0; | |
1979 | ||
1980 | for (ALL_LIST_ELEMENTS(oi->ospf->oiflist, oinode, | |
1981 | oinnode, out_if)) { | |
1982 | if (out_if == NULL) | |
1983 | break; | |
1984 | ||
1985 | if ((IPV4_ADDR_SAME(&out_if->address->u.prefix4, | |
1986 | &lsa->data->id)) | |
1987 | && (!(IPV4_ADDR_SAME( | |
1988 | &oi->ospf->router_id, | |
1989 | &lsa->data->adv_router)))) { | |
1990 | if (out_if->network_lsa_self) { | |
1991 | ospf_lsa_flush_area( | |
1992 | lsa, out_if->area); | |
1993 | if (IS_DEBUG_OSPF_EVENT) | |
1994 | zlog_debug( | |
1995 | "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", | |
1996 | (void *)lsa, | |
1997 | (int)lsa->data | |
1998 | ->type); | |
1999 | ospf_lsa_discard(lsa); | |
2000 | Flag = 1; | |
2001 | } | |
2002 | break; | |
2003 | } | |
2004 | } | |
2005 | if (Flag) | |
2006 | continue; | |
2007 | } | |
2008 | ||
2009 | /* (5) Find the instance of this LSA that is currently contained | |
2010 | in the router's link state database. If there is no | |
2011 | database copy, or the received LSA is more recent than | |
2012 | the database copy the following steps must be performed. | |
2013 | (The sub steps from RFC 2328 section 13 step (5) will be | |
2014 | performed in | |
2015 | ospf_flood() ) */ | |
2016 | ||
2017 | if (current == NULL | |
2018 | || (ret = ospf_lsa_more_recent(current, lsa)) < 0) { | |
2019 | /* Actual flooding procedure. */ | |
2020 | if (ospf_flood(oi->ospf, nbr, current, lsa) | |
2021 | < 0) /* Trap NSSA later. */ | |
2022 | DISCARD_LSA(lsa, 4); | |
2023 | continue; | |
2024 | } | |
2025 | ||
2026 | /* (6) Else, If there is an instance of the LSA on the sending | |
2027 | neighbor's Link state request list, an error has occurred in | |
2028 | the Database Exchange process. In this case, restart the | |
2029 | Database Exchange process by generating the neighbor event | |
2030 | BadLSReq for the sending neighbor and stop processing the | |
2031 | Link State Update packet. */ | |
2032 | ||
2033 | if (ospf_ls_request_lookup(nbr, lsa)) { | |
2034 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_BadLSReq); | |
2035 | zlog_warn( | |
2036 | "LSA[%s] instance exists on Link state request list", | |
2037 | dump_lsa_key(lsa)); | |
2038 | ||
2039 | /* Clean list of LSAs. */ | |
2040 | ospf_upd_list_clean(lsas); | |
2041 | /* this lsa is not on lsas list already. */ | |
2042 | ospf_lsa_discard(lsa); | |
2043 | return; | |
2044 | } | |
2045 | ||
2046 | /* If the received LSA is the same instance as the database copy | |
2047 | (i.e., neither one is more recent) the following two steps | |
2048 | should be performed: */ | |
2049 | ||
2050 | if (ret == 0) { | |
2051 | /* If the LSA is listed in the Link state retransmission | |
2052 | list | |
2053 | for the receiving adjacency, the router itself is | |
2054 | expecting | |
2055 | an acknowledgment for this LSA. The router should | |
2056 | treat the | |
2057 | received LSA as an acknowledgment by removing the LSA | |
2058 | from | |
2059 | the Link state retransmission list. This is termed | |
2060 | an | |
2061 | "implied acknowledgment". */ | |
2062 | ||
2063 | ls_ret = ospf_ls_retransmit_lookup(nbr, lsa); | |
2064 | ||
2065 | if (ls_ret != NULL) { | |
2066 | ospf_ls_retransmit_delete(nbr, ls_ret); | |
2067 | ||
2068 | /* Delayed acknowledgment sent if advertisement | |
2069 | received | |
2070 | from Designated Router, otherwise do nothing. | |
2071 | */ | |
2072 | if (oi->state == ISM_Backup) | |
2073 | if (NBR_IS_DR(nbr)) | |
2074 | listnode_add( | |
2075 | oi->ls_ack, | |
2076 | ospf_lsa_lock(lsa)); | |
2077 | ||
2078 | DISCARD_LSA(lsa, 5); | |
2079 | } else | |
2080 | /* Acknowledge the receipt of the LSA by sending a | |
2081 | Link State Acknowledgment packet back out the | |
2082 | receiving | |
2083 | interface. */ | |
2084 | { | |
2085 | ospf_ls_ack_send(nbr, lsa); | |
2086 | DISCARD_LSA(lsa, 6); | |
2087 | } | |
2088 | } | |
2089 | ||
2090 | /* The database copy is more recent. If the database copy | |
2091 | has LS age equal to MaxAge and LS sequence number equal to | |
2092 | MaxSequenceNumber, simply discard the received LSA without | |
2093 | acknowledging it. (In this case, the LSA's LS sequence number | |
2094 | is | |
2095 | wrapping, and the MaxSequenceNumber LSA must be completely | |
2096 | flushed before any new LSA instance can be introduced). */ | |
2097 | ||
2098 | else if (ret > 0) /* Database copy is more recent */ | |
2099 | { | |
2100 | if (IS_LSA_MAXAGE(current) | |
2101 | && current->data->ls_seqnum | |
2102 | == htonl(OSPF_MAX_SEQUENCE_NUMBER)) { | |
2103 | DISCARD_LSA(lsa, 7); | |
2104 | } | |
2105 | /* Otherwise, as long as the database copy has not been | |
2106 | sent in a | |
2107 | Link State Update within the last MinLSArrival | |
2108 | seconds, send the | |
2109 | database copy back to the sending neighbor, | |
2110 | encapsulated within | |
2111 | a Link State Update Packet. The Link State Update | |
2112 | Packet should | |
2113 | be sent directly to the neighbor. In so doing, do not | |
2114 | put the | |
2115 | database copy of the LSA on the neighbor's link state | |
2116 | retransmission list, and do not acknowledge the | |
2117 | received (less | |
2118 | recent) LSA instance. */ | |
2119 | else { | |
2120 | if (monotime_since(¤t->tv_orig, NULL) | |
2121 | >= ospf->min_ls_arrival * 1000LL) | |
2122 | /* Trap NSSA type later.*/ | |
2123 | ospf_ls_upd_send_lsa( | |
2124 | nbr, current, | |
2125 | OSPF_SEND_PACKET_DIRECT); | |
2126 | DISCARD_LSA(lsa, 8); | |
2127 | } | |
2128 | } | |
2129 | } | |
2cd754de PJ |
2130 | #undef DISCARD_LSA |
2131 | ||
ac4d0be5 | 2132 | assert(listcount(lsas) == 0); |
2133 | list_delete(lsas); | |
718e3744 | 2134 | } |
2135 | ||
2136 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
ac4d0be5 | 2137 | static void ospf_ls_ack(struct ip *iph, struct ospf_header *ospfh, |
2138 | struct stream *s, struct ospf_interface *oi, | |
2139 | u_int16_t size) | |
2140 | { | |
2141 | struct ospf_neighbor *nbr; | |
2142 | ||
2143 | /* increment statistics. */ | |
2144 | oi->ls_ack_in++; | |
2145 | ||
2146 | nbr = ospf_nbr_lookup(oi, iph, ospfh); | |
2147 | if (nbr == NULL) { | |
2148 | zlog_warn("Link State Acknowledgment: Unknown Neighbor %s.", | |
2149 | inet_ntoa(ospfh->router_id)); | |
2150 | return; | |
2151 | } | |
2152 | ||
2153 | /* Add event to thread. */ | |
2154 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_PacketReceived); | |
2155 | ||
2156 | if (nbr->state < NSM_Exchange) { | |
2157 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
2158 | zlog_debug( | |
2159 | "Link State Acknowledgment: " | |
2160 | "Neighbor[%s] state %s is less than Exchange", | |
2161 | inet_ntoa(ospfh->router_id), | |
2162 | lookup_msg(ospf_nsm_state_msg, nbr->state, | |
2163 | NULL)); | |
2164 | return; | |
2165 | } | |
2166 | ||
2167 | while (size >= OSPF_LSA_HEADER_SIZE) { | |
2168 | struct ospf_lsa *lsa, *lsr; | |
2169 | ||
2170 | lsa = ospf_lsa_new(); | |
2171 | lsa->data = (struct lsa_header *)STREAM_PNT(s); | |
2172 | ||
2173 | /* lsah = (struct lsa_header *) STREAM_PNT (s); */ | |
2174 | size -= OSPF_LSA_HEADER_SIZE; | |
2175 | stream_forward_getp(s, OSPF_LSA_HEADER_SIZE); | |
2176 | ||
2177 | if (lsa->data->type < OSPF_MIN_LSA | |
2178 | || lsa->data->type >= OSPF_MAX_LSA) { | |
2179 | lsa->data = NULL; | |
2180 | ospf_lsa_discard(lsa); | |
2181 | continue; | |
2182 | } | |
2183 | ||
2184 | lsr = ospf_ls_retransmit_lookup(nbr, lsa); | |
2185 | ||
2186 | if (lsr != NULL && ospf_lsa_more_recent(lsr, lsa) == 0) | |
2187 | ospf_ls_retransmit_delete(nbr, lsr); | |
2188 | ||
2189 | lsa->data = NULL; | |
2190 | ospf_lsa_discard(lsa); | |
2191 | } | |
2192 | ||
2193 | return; | |
2194 | } | |
2195 | ||
2196 | static struct stream *ospf_recv_packet(int fd, struct interface **ifp, | |
2197 | struct stream *ibuf) | |
2198 | { | |
2199 | int ret; | |
2200 | struct ip *iph; | |
2201 | u_int16_t ip_len; | |
2202 | ifindex_t ifindex = 0; | |
2203 | struct iovec iov; | |
2204 | /* Header and data both require alignment. */ | |
2205 | char buff[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; | |
2206 | struct msghdr msgh; | |
2207 | ||
2208 | memset(&msgh, 0, sizeof(struct msghdr)); | |
2209 | msgh.msg_iov = &iov; | |
2210 | msgh.msg_iovlen = 1; | |
2211 | msgh.msg_control = (caddr_t)buff; | |
2212 | msgh.msg_controllen = sizeof(buff); | |
2213 | ||
2214 | ret = stream_recvmsg(ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE + 1); | |
2215 | if (ret < 0) { | |
2216 | zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno)); | |
2217 | return NULL; | |
2218 | } | |
2219 | if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */ | |
718e3744 | 2220 | { |
ac4d0be5 | 2221 | zlog_warn( |
2222 | "ospf_recv_packet: discarding runt packet of length %d " | |
2223 | "(ip header size is %u)", | |
2224 | ret, (u_int)sizeof(iph)); | |
2225 | return NULL; | |
2226 | } | |
2227 | ||
2228 | /* Note that there should not be alignment problems with this assignment | |
2229 | because this is at the beginning of the stream data buffer. */ | |
2230 | iph = (struct ip *)STREAM_DATA(ibuf); | |
2231 | sockopt_iphdrincl_swab_systoh(iph); | |
2232 | ||
2233 | ip_len = iph->ip_len; | |
2234 | ||
de5ccb96 | 2235 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000) |
ac4d0be5 | 2236 | /* |
2237 | * Kernel network code touches incoming IP header parameters, | |
2238 | * before protocol specific processing. | |
2239 | * | |
2240 | * 1) Convert byteorder to host representation. | |
2241 | * --> ip_len, ip_id, ip_off | |
2242 | * | |
2243 | * 2) Adjust ip_len to strip IP header size! | |
2244 | * --> If user process receives entire IP packet via RAW | |
2245 | * socket, it must consider adding IP header size to | |
2246 | * the "ip_len" field of "ip" structure. | |
2247 | * | |
2248 | * For more details, see <netinet/ip_input.c>. | |
2249 | */ | |
2250 | ip_len = ip_len + (iph->ip_hl << 2); | |
718e3744 | 2251 | #endif |
ac4d0be5 | 2252 | |
0150c9c9 | 2253 | #if defined(__DragonFly__) |
ac4d0be5 | 2254 | /* |
2255 | * in DragonFly's raw socket, ip_len/ip_off are read | |
2256 | * in network byte order. | |
2257 | * As OpenBSD < 200311 adjust ip_len to strip IP header size! | |
2258 | */ | |
2259 | ip_len = ntohs(iph->ip_len) + (iph->ip_hl << 2); | |
0150c9c9 DB |
2260 | #endif |
2261 | ||
ac4d0be5 | 2262 | ifindex = getsockopt_ifindex(AF_INET, &msgh); |
2263 | ||
2264 | *ifp = if_lookup_by_index(ifindex, VRF_DEFAULT); | |
718e3744 | 2265 | |
ac4d0be5 | 2266 | if (ret != ip_len) { |
2267 | zlog_warn( | |
2268 | "ospf_recv_packet read length mismatch: ip_len is %d, " | |
2269 | "but recvmsg returned %d", | |
2270 | ip_len, ret); | |
2271 | return NULL; | |
2272 | } | |
2273 | ||
2274 | return ibuf; | |
718e3744 | 2275 | } |
2276 | ||
4dadc291 | 2277 | static struct ospf_interface * |
ac4d0be5 | 2278 | ospf_associate_packet_vl(struct ospf *ospf, struct interface *ifp, |
2279 | struct ip *iph, struct ospf_header *ospfh) | |
2280 | { | |
2281 | struct ospf_interface *rcv_oi; | |
2282 | struct ospf_vl_data *vl_data; | |
2283 | struct ospf_area *vl_area; | |
2284 | struct listnode *node; | |
2285 | ||
2286 | if (IN_MULTICAST(ntohl(iph->ip_dst.s_addr)) | |
2287 | || !OSPF_IS_AREA_BACKBONE(ospfh)) | |
2288 | return NULL; | |
2289 | ||
2290 | /* look for local OSPF interface matching the destination | |
2291 | * to determine Area ID. We presume therefore the destination address | |
2292 | * is unique, or at least (for "unnumbered" links), not used in other | |
2293 | * areas | |
2294 | */ | |
2295 | if ((rcv_oi = ospf_if_lookup_by_local_addr(ospf, NULL, iph->ip_dst)) | |
2296 | == NULL) | |
2297 | return NULL; | |
2298 | ||
2299 | for (ALL_LIST_ELEMENTS_RO(ospf->vlinks, node, vl_data)) { | |
2300 | vl_area = | |
2301 | ospf_area_lookup_by_area_id(ospf, vl_data->vl_area_id); | |
2302 | if (!vl_area) | |
2303 | continue; | |
2304 | ||
2305 | if (OSPF_AREA_SAME(&vl_area, &rcv_oi->area) | |
2306 | && IPV4_ADDR_SAME(&vl_data->vl_peer, &ospfh->router_id)) { | |
2307 | if (IS_DEBUG_OSPF_EVENT) | |
2308 | zlog_debug("associating packet with %s", | |
2309 | IF_NAME(vl_data->vl_oi)); | |
2310 | if (!CHECK_FLAG(vl_data->vl_oi->ifp->flags, IFF_UP)) { | |
2311 | if (IS_DEBUG_OSPF_EVENT) | |
2312 | zlog_debug( | |
2313 | "This VL is not up yet, sorry"); | |
2314 | return NULL; | |
2315 | } | |
2316 | ||
2317 | return vl_data->vl_oi; | |
2318 | } | |
718e3744 | 2319 | } |
718e3744 | 2320 | |
ac4d0be5 | 2321 | if (IS_DEBUG_OSPF_EVENT) |
2322 | zlog_debug("couldn't find any VL to associate the packet with"); | |
2323 | ||
2324 | return NULL; | |
718e3744 | 2325 | } |
2326 | ||
ac4d0be5 | 2327 | static int ospf_check_area_id(struct ospf_interface *oi, |
2328 | struct ospf_header *ospfh) | |
718e3744 | 2329 | { |
ac4d0be5 | 2330 | /* Check match the Area ID of the receiving interface. */ |
2331 | if (OSPF_AREA_SAME(&oi->area, &ospfh)) | |
2332 | return 1; | |
718e3744 | 2333 | |
ac4d0be5 | 2334 | return 0; |
718e3744 | 2335 | } |
2336 | ||
2337 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2338 | To prevent it, compare src IP address and i/f address with masking | |
2339 | i/f network mask. */ | |
ac4d0be5 | 2340 | static int ospf_check_network_mask(struct ospf_interface *oi, |
2341 | struct in_addr ip_src) | |
718e3744 | 2342 | { |
ac4d0be5 | 2343 | struct in_addr mask, me, him; |
718e3744 | 2344 | |
ac4d0be5 | 2345 | if (oi->type == OSPF_IFTYPE_POINTOPOINT |
2346 | || oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2347 | return 1; | |
718e3744 | 2348 | |
ac4d0be5 | 2349 | masklen2ip(oi->address->prefixlen, &mask); |
718e3744 | 2350 | |
ac4d0be5 | 2351 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; |
2352 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
718e3744 | 2353 | |
ac4d0be5 | 2354 | if (IPV4_ADDR_SAME(&me, &him)) |
2355 | return 1; | |
718e3744 | 2356 | |
ac4d0be5 | 2357 | return 0; |
718e3744 | 2358 | } |
2359 | ||
bd5651f0 DO |
2360 | /* Return 1, if the packet is properly authenticated and checksummed, |
2361 | 0 otherwise. In particular, check that AuType header field is valid and | |
2362 | matches the locally configured AuType, and that D.5 requirements are met. */ | |
ac4d0be5 | 2363 | static int ospf_check_auth(struct ospf_interface *oi, struct ospf_header *ospfh) |
2364 | { | |
2365 | struct crypt_key *ck; | |
2366 | u_int16_t iface_auth_type; | |
2367 | u_int16_t pkt_auth_type = ntohs(ospfh->auth_type); | |
2368 | ||
2369 | switch (pkt_auth_type) { | |
2370 | case OSPF_AUTH_NULL: /* RFC2328 D.5.1 */ | |
2371 | if (OSPF_AUTH_NULL != (iface_auth_type = ospf_auth_type(oi))) { | |
2372 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2373 | zlog_warn( | |
2374 | "interface %s: auth-type mismatch, local %s, rcvd Null", | |
2375 | IF_NAME(oi), | |
2376 | lookup_msg(ospf_auth_type_str, | |
2377 | iface_auth_type, NULL)); | |
2378 | return 0; | |
2379 | } | |
2380 | if (!ospf_check_sum(ospfh)) { | |
2381 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2382 | zlog_warn( | |
2383 | "interface %s: Null auth OK, but checksum error, Router-ID %s", | |
2384 | IF_NAME(oi), | |
2385 | inet_ntoa(ospfh->router_id)); | |
2386 | return 0; | |
2387 | } | |
2388 | return 1; | |
2389 | case OSPF_AUTH_SIMPLE: /* RFC2328 D.5.2 */ | |
2390 | if (OSPF_AUTH_SIMPLE | |
2391 | != (iface_auth_type = ospf_auth_type(oi))) { | |
2392 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2393 | zlog_warn( | |
2394 | "interface %s: auth-type mismatch, local %s, rcvd Simple", | |
2395 | IF_NAME(oi), | |
2396 | lookup_msg(ospf_auth_type_str, | |
2397 | iface_auth_type, NULL)); | |
2398 | return 0; | |
2399 | } | |
2400 | if (memcmp(OSPF_IF_PARAM(oi, auth_simple), ospfh->u.auth_data, | |
2401 | OSPF_AUTH_SIMPLE_SIZE)) { | |
2402 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2403 | zlog_warn("interface %s: Simple auth failed", | |
2404 | IF_NAME(oi)); | |
2405 | return 0; | |
2406 | } | |
2407 | if (!ospf_check_sum(ospfh)) { | |
2408 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2409 | zlog_warn( | |
2410 | "interface %s: Simple auth OK, checksum error, Router-ID %s", | |
2411 | IF_NAME(oi), | |
2412 | inet_ntoa(ospfh->router_id)); | |
2413 | return 0; | |
2414 | } | |
2415 | return 1; | |
2416 | case OSPF_AUTH_CRYPTOGRAPHIC: /* RFC2328 D.5.3 */ | |
2417 | if (OSPF_AUTH_CRYPTOGRAPHIC | |
2418 | != (iface_auth_type = ospf_auth_type(oi))) { | |
2419 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2420 | zlog_warn( | |
2421 | "interface %s: auth-type mismatch, local %s, rcvd Cryptographic", | |
2422 | IF_NAME(oi), | |
2423 | lookup_msg(ospf_auth_type_str, | |
2424 | iface_auth_type, NULL)); | |
2425 | return 0; | |
2426 | } | |
2427 | if (ospfh->checksum) { | |
2428 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2429 | zlog_warn( | |
2430 | "interface %s: OSPF header checksum is not 0", | |
2431 | IF_NAME(oi)); | |
2432 | return 0; | |
2433 | } | |
2434 | /* only MD5 crypto method can pass ospf_packet_examin() */ | |
2435 | if ( | |
2436 | NULL == (ck = listgetdata(listtail( | |
2437 | OSPF_IF_PARAM(oi, auth_crypt)))) | |
2438 | || ospfh->u.crypt.key_id != ck->key_id || | |
2439 | /* Condition above uses the last key ID on the list, | |
2440 | which is | |
2441 | different from what ospf_crypt_key_lookup() does. A | |
2442 | bug? */ | |
2443 | !ospf_check_md5_digest(oi, ospfh)) { | |
2444 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2445 | zlog_warn("interface %s: MD5 auth failed", | |
2446 | IF_NAME(oi)); | |
2447 | return 0; | |
2448 | } | |
2449 | return 1; | |
2450 | default: | |
2451 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) | |
2452 | zlog_warn( | |
2453 | "interface %s: invalid packet auth-type (%02x)", | |
2454 | IF_NAME(oi), pkt_auth_type); | |
2455 | return 0; | |
2456 | } | |
2457 | } | |
2458 | ||
2459 | static int ospf_check_sum(struct ospf_header *ospfh) | |
2460 | { | |
2461 | u_int32_t ret; | |
2462 | u_int16_t sum; | |
2463 | ||
2464 | /* clear auth_data for checksum. */ | |
2465 | memset(ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2466 | ||
2467 | /* keep checksum and clear. */ | |
2468 | sum = ospfh->checksum; | |
2469 | memset(&ospfh->checksum, 0, sizeof(u_int16_t)); | |
2470 | ||
2471 | /* calculate checksum. */ | |
2472 | ret = in_cksum(ospfh, ntohs(ospfh->length)); | |
2473 | ||
2474 | if (ret != sum) { | |
2475 | zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2476 | ret, sum); | |
2477 | return 0; | |
2478 | } | |
2479 | ||
2480 | return 1; | |
718e3744 | 2481 | } |
2482 | ||
4e31de79 DO |
2483 | /* Verify, that given link/TOS records are properly sized/aligned and match |
2484 | Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */ | |
ac4d0be5 | 2485 | static unsigned ospf_router_lsa_links_examin(struct router_lsa_link *link, |
2486 | u_int16_t linkbytes, | |
2487 | const u_int16_t num_links) | |
2488 | { | |
2489 | unsigned counted_links = 0, thislinklen; | |
2490 | ||
2491 | while (linkbytes) { | |
2492 | thislinklen = | |
2493 | OSPF_ROUTER_LSA_LINK_SIZE + 4 * link->m[0].tos_count; | |
2494 | if (thislinklen > linkbytes) { | |
2495 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2496 | zlog_debug("%s: length error in link block #%u", | |
2497 | __func__, counted_links); | |
2498 | return MSG_NG; | |
2499 | } | |
2500 | link = (struct router_lsa_link *)((caddr_t)link + thislinklen); | |
2501 | linkbytes -= thislinklen; | |
2502 | counted_links++; | |
2503 | } | |
2504 | if (counted_links != num_links) { | |
2505 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2506 | zlog_debug("%s: %u link blocks declared, %u present", | |
2507 | __func__, num_links, counted_links); | |
2508 | return MSG_NG; | |
2509 | } | |
2510 | return MSG_OK; | |
4e31de79 DO |
2511 | } |
2512 | ||
2513 | /* Verify, that the given LSA is properly sized/aligned (including type-specific | |
2514 | minimum length constraint). */ | |
ac4d0be5 | 2515 | static unsigned ospf_lsa_examin(struct lsa_header *lsah, const u_int16_t lsalen, |
2516 | const u_char headeronly) | |
2517 | { | |
2518 | unsigned ret; | |
2519 | struct router_lsa *rlsa; | |
2520 | if (lsah->type < OSPF_MAX_LSA && ospf_lsa_minlen[lsah->type] | |
2521 | && lsalen < OSPF_LSA_HEADER_SIZE + ospf_lsa_minlen[lsah->type]) { | |
2522 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2523 | zlog_debug("%s: undersized (%u B) %s", __func__, lsalen, | |
2524 | lookup_msg(ospf_lsa_type_msg, lsah->type, | |
2525 | NULL)); | |
2526 | return MSG_NG; | |
2527 | } | |
2528 | switch (lsah->type) { | |
2529 | case OSPF_ROUTER_LSA: | |
2530 | /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1 | |
2531 | * (12+)-byte link blocks */ | |
2532 | if (headeronly) { | |
2533 | ret = (lsalen - OSPF_LSA_HEADER_SIZE | |
2534 | - OSPF_ROUTER_LSA_MIN_SIZE) | |
2535 | % 4 | |
2536 | ? MSG_NG | |
2537 | : MSG_OK; | |
2538 | break; | |
2539 | } | |
2540 | rlsa = (struct router_lsa *)lsah; | |
2541 | ret = ospf_router_lsa_links_examin( | |
2542 | (struct router_lsa_link *)rlsa->link, | |
2543 | lsalen - OSPF_LSA_HEADER_SIZE - 4, /* skip: basic | |
2544 | header, "flags", | |
2545 | 0, "# links" */ | |
2546 | ntohs(rlsa->links) /* 16 bits */ | |
2547 | ); | |
2548 | break; | |
2549 | case OSPF_AS_EXTERNAL_LSA: | |
2550 | /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long | |
2551 | * blocks */ | |
2552 | case OSPF_AS_NSSA_LSA: | |
2553 | /* RFC3101 C, idem */ | |
2554 | ret = (lsalen - OSPF_LSA_HEADER_SIZE | |
2555 | - OSPF_AS_EXTERNAL_LSA_MIN_SIZE) | |
2556 | % 12 | |
2557 | ? MSG_NG | |
2558 | : MSG_OK; | |
2559 | break; | |
2560 | /* Following LSA types are considered OK length-wise as soon as their | |
2561 | * minimum | |
2562 | * length constraint is met and length of the whole LSA is a multiple of | |
2563 | * 4 | |
2564 | * (basic LSA header size is already a multiple of 4). */ | |
2565 | case OSPF_NETWORK_LSA: | |
2566 | /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */ | |
2567 | case OSPF_SUMMARY_LSA: | |
2568 | case OSPF_ASBR_SUMMARY_LSA: | |
2569 | /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS | |
2570 | * blocks */ | |
2571 | case OSPF_OPAQUE_LINK_LSA: | |
2572 | case OSPF_OPAQUE_AREA_LSA: | |
2573 | case OSPF_OPAQUE_AS_LSA: | |
2574 | /* RFC5250 A.2, "some number of octets (of application-specific | |
2575 | * data) padded to 32-bit alignment." This is considered | |
2576 | * equivalent | |
2577 | * to 4-byte alignment of all other LSA types, see | |
2578 | * OSPF-ALIGNMENT.txt | |
2579 | * file for the detailed analysis of this passage. */ | |
2580 | ret = lsalen % 4 ? MSG_NG : MSG_OK; | |
2581 | break; | |
2582 | default: | |
2583 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2584 | zlog_debug("%s: unsupported LSA type 0x%02x", __func__, | |
2585 | lsah->type); | |
2586 | return MSG_NG; | |
2587 | } | |
2588 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2589 | zlog_debug("%s: alignment error in %s", __func__, | |
2590 | lookup_msg(ospf_lsa_type_msg, lsah->type, NULL)); | |
2591 | return ret; | |
4e31de79 DO |
2592 | } |
2593 | ||
2594 | /* Verify if the provided input buffer is a valid sequence of LSAs. This | |
2595 | includes verification of LSA blocks length/alignment and dispatching | |
2596 | of deeper-level checks. */ | |
2597 | static unsigned | |
ac4d0be5 | 2598 | ospf_lsaseq_examin(struct lsa_header *lsah, /* start of buffered data */ |
2599 | size_t length, const u_char headeronly, | |
2600 | /* When declared_num_lsas is not 0, compare it to the real | |
2601 | number of LSAs | |
2602 | and treat the difference as an error. */ | |
2603 | const u_int32_t declared_num_lsas) | |
2604 | { | |
2605 | u_int32_t counted_lsas = 0; | |
2606 | ||
2607 | while (length) { | |
2608 | u_int16_t lsalen; | |
2609 | if (length < OSPF_LSA_HEADER_SIZE) { | |
2610 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2611 | zlog_debug( | |
2612 | "%s: undersized (%zu B) trailing (#%u) LSA header", | |
2613 | __func__, length, counted_lsas); | |
2614 | return MSG_NG; | |
2615 | } | |
2616 | /* save on ntohs() calls here and in the LSA validator */ | |
2617 | lsalen = ntohs(lsah->length); | |
2618 | if (lsalen < OSPF_LSA_HEADER_SIZE) { | |
2619 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2620 | zlog_debug( | |
2621 | "%s: malformed LSA header #%u, declared length is %u B", | |
2622 | __func__, counted_lsas, lsalen); | |
2623 | return MSG_NG; | |
2624 | } | |
2625 | if (headeronly) { | |
2626 | /* less checks here and in ospf_lsa_examin() */ | |
2627 | if (MSG_OK != ospf_lsa_examin(lsah, lsalen, 1)) { | |
2628 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2629 | zlog_debug( | |
2630 | "%s: malformed header-only LSA #%u", | |
2631 | __func__, counted_lsas); | |
2632 | return MSG_NG; | |
2633 | } | |
2634 | lsah = (struct lsa_header *)((caddr_t)lsah | |
2635 | + OSPF_LSA_HEADER_SIZE); | |
2636 | length -= OSPF_LSA_HEADER_SIZE; | |
2637 | } else { | |
2638 | /* make sure the input buffer is deep enough before | |
2639 | * further checks */ | |
2640 | if (lsalen > length) { | |
2641 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2642 | zlog_debug( | |
2643 | "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B", | |
2644 | __func__, counted_lsas, lsalen, | |
2645 | length); | |
2646 | return MSG_NG; | |
2647 | } | |
2648 | if (MSG_OK != ospf_lsa_examin(lsah, lsalen, 0)) { | |
2649 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2650 | zlog_debug("%s: malformed LSA #%u", | |
2651 | __func__, counted_lsas); | |
2652 | return MSG_NG; | |
2653 | } | |
2654 | lsah = (struct lsa_header *)((caddr_t)lsah + lsalen); | |
2655 | length -= lsalen; | |
2656 | } | |
2657 | counted_lsas++; | |
2658 | } | |
2659 | ||
2660 | if (declared_num_lsas && counted_lsas != declared_num_lsas) { | |
2661 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2662 | zlog_debug( | |
2663 | "%s: #LSAs declared (%u) does not match actual (%u)", | |
2664 | __func__, declared_num_lsas, counted_lsas); | |
2665 | return MSG_NG; | |
2666 | } | |
2667 | return MSG_OK; | |
4e31de79 DO |
2668 | } |
2669 | ||
75c8eabb | 2670 | /* Verify a complete OSPF packet for proper sizing/alignment. */ |
ac4d0be5 | 2671 | static unsigned ospf_packet_examin(struct ospf_header *oh, |
2672 | const unsigned bytesonwire) | |
2673 | { | |
2674 | u_int16_t bytesdeclared, bytesauth; | |
2675 | unsigned ret; | |
2676 | struct ospf_ls_update *lsupd; | |
2677 | ||
2678 | /* Length, 1st approximation. */ | |
2679 | if (bytesonwire < OSPF_HEADER_SIZE) { | |
2680 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2681 | zlog_debug("%s: undersized (%u B) packet", __func__, | |
2682 | bytesonwire); | |
2683 | return MSG_NG; | |
2684 | } | |
2685 | /* Now it is safe to access header fields. Performing length check, | |
2686 | * allow | |
2687 | * for possible extra bytes of crypto auth/padding, which are not | |
2688 | * counted | |
2689 | * in the OSPF header "length" field. */ | |
2690 | if (oh->version != OSPF_VERSION) { | |
2691 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2692 | zlog_debug("%s: invalid (%u) protocol version", | |
2693 | __func__, oh->version); | |
2694 | return MSG_NG; | |
2695 | } | |
2696 | bytesdeclared = ntohs(oh->length); | |
2697 | if (ntohs(oh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2698 | bytesauth = 0; | |
2699 | else { | |
2700 | if (oh->u.crypt.auth_data_len != OSPF_AUTH_MD5_SIZE) { | |
2701 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2702 | zlog_debug( | |
2703 | "%s: unsupported crypto auth length (%u B)", | |
2704 | __func__, oh->u.crypt.auth_data_len); | |
2705 | return MSG_NG; | |
2706 | } | |
2707 | bytesauth = OSPF_AUTH_MD5_SIZE; | |
2708 | } | |
2709 | if (bytesdeclared + bytesauth > bytesonwire) { | |
2710 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2711 | zlog_debug( | |
2712 | "%s: packet length error (%u real, %u+%u declared)", | |
2713 | __func__, bytesonwire, bytesdeclared, | |
2714 | bytesauth); | |
2715 | return MSG_NG; | |
2716 | } | |
2717 | /* Length, 2nd approximation. The type-specific constraint is checked | |
2718 | against declared length, not amount of bytes on wire. */ | |
2719 | if (oh->type >= OSPF_MSG_HELLO && oh->type <= OSPF_MSG_LS_ACK | |
2720 | && bytesdeclared | |
2721 | < OSPF_HEADER_SIZE + ospf_packet_minlen[oh->type]) { | |
2722 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2723 | zlog_debug("%s: undersized (%u B) %s packet", __func__, | |
2724 | bytesdeclared, | |
2725 | lookup_msg(ospf_packet_type_str, oh->type, | |
2726 | NULL)); | |
2727 | return MSG_NG; | |
2728 | } | |
2729 | switch (oh->type) { | |
2730 | case OSPF_MSG_HELLO: | |
2731 | /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes | |
2732 | followed | |
2733 | by N>=0 router-IDs. */ | |
2734 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_HELLO_MIN_SIZE) | |
2735 | % 4 | |
2736 | ? MSG_NG | |
2737 | : MSG_OK; | |
2738 | break; | |
2739 | case OSPF_MSG_DB_DESC: | |
2740 | /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes | |
2741 | followed | |
2742 | by N>=0 header-only LSAs. */ | |
2743 | ret = ospf_lsaseq_examin( | |
2744 | (struct lsa_header *)((caddr_t)oh + OSPF_HEADER_SIZE | |
2745 | + OSPF_DB_DESC_MIN_SIZE), | |
2746 | bytesdeclared - OSPF_HEADER_SIZE | |
2747 | - OSPF_DB_DESC_MIN_SIZE, | |
2748 | 1, /* header-only LSAs */ | |
2749 | 0); | |
2750 | break; | |
2751 | case OSPF_MSG_LS_REQ: | |
2752 | /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes | |
2753 | * request blocks. */ | |
2754 | ret = (bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_REQ_MIN_SIZE) | |
2755 | % OSPF_LSA_KEY_SIZE | |
2756 | ? MSG_NG | |
2757 | : MSG_OK; | |
2758 | break; | |
2759 | case OSPF_MSG_LS_UPD: | |
2760 | /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes | |
2761 | followed | |
2762 | by N>=0 full LSAs (with N declared beforehand). */ | |
2763 | lsupd = (struct ospf_ls_update *)((caddr_t)oh | |
2764 | + OSPF_HEADER_SIZE); | |
2765 | ret = ospf_lsaseq_examin( | |
2766 | (struct lsa_header *)((caddr_t)lsupd | |
2767 | + OSPF_LS_UPD_MIN_SIZE), | |
2768 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_UPD_MIN_SIZE, | |
2769 | 0, /* full LSAs */ | |
2770 | ntohl(lsupd->num_lsas) /* 32 bits */ | |
2771 | ); | |
2772 | break; | |
2773 | case OSPF_MSG_LS_ACK: | |
2774 | /* RFC2328 A.3.6, packet header followed by N>=0 header-only | |
2775 | * LSAs. */ | |
2776 | ret = ospf_lsaseq_examin( | |
2777 | (struct lsa_header *)((caddr_t)oh + OSPF_HEADER_SIZE | |
2778 | + OSPF_LS_ACK_MIN_SIZE), | |
2779 | bytesdeclared - OSPF_HEADER_SIZE - OSPF_LS_ACK_MIN_SIZE, | |
2780 | 1, /* header-only LSAs */ | |
2781 | 0); | |
2782 | break; | |
2783 | default: | |
2784 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2785 | zlog_debug("%s: invalid packet type 0x%02x", __func__, | |
2786 | oh->type); | |
2787 | return MSG_NG; | |
2788 | } | |
2789 | if (ret != MSG_OK && IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2790 | zlog_debug("%s: malformed %s packet", __func__, | |
2791 | lookup_msg(ospf_packet_type_str, oh->type, NULL)); | |
2792 | return ret; | |
75c8eabb DO |
2793 | } |
2794 | ||
718e3744 | 2795 | /* OSPF Header verification. */ |
ac4d0be5 | 2796 | static int ospf_verify_header(struct stream *ibuf, struct ospf_interface *oi, |
2797 | struct ip *iph, struct ospf_header *ospfh) | |
2798 | { | |
2799 | /* Check Area ID. */ | |
2800 | if (!ospf_check_area_id(oi, ospfh)) { | |
2801 | zlog_warn("interface %s: ospf_read invalid Area ID %s.", | |
2802 | IF_NAME(oi), inet_ntoa(ospfh->area_id)); | |
2803 | return -1; | |
2804 | } | |
718e3744 | 2805 | |
ac4d0be5 | 2806 | /* Check network mask, Silently discarded. */ |
2807 | if (!ospf_check_network_mask(oi, iph->ip_src)) { | |
2808 | zlog_warn( | |
2809 | "interface %s: ospf_read network address is not same [%s]", | |
2810 | IF_NAME(oi), inet_ntoa(iph->ip_src)); | |
2811 | return -1; | |
2812 | } | |
718e3744 | 2813 | |
ac4d0be5 | 2814 | /* Check authentication. The function handles logging actions, where |
2815 | * required. */ | |
2816 | if (!ospf_check_auth(oi, ospfh)) | |
2817 | return -1; | |
718e3744 | 2818 | |
ac4d0be5 | 2819 | return 0; |
718e3744 | 2820 | } |
2821 | ||
2822 | /* Starting point of packet process function. */ | |
ac4d0be5 | 2823 | int ospf_read(struct thread *thread) |
2824 | { | |
2825 | int ret; | |
2826 | struct stream *ibuf; | |
2827 | struct ospf *ospf; | |
2828 | struct ospf_interface *oi; | |
2829 | struct ip *iph; | |
2830 | struct ospf_header *ospfh; | |
2831 | u_int16_t length; | |
2832 | struct interface *ifp; | |
2833 | struct connected *c; | |
2834 | ||
2835 | /* first of all get interface pointer. */ | |
2836 | ospf = THREAD_ARG(thread); | |
2837 | ||
2838 | /* prepare for next packet. */ | |
2839 | ospf->t_read = thread_add_read(master, ospf_read, ospf, ospf->fd); | |
2840 | ||
2841 | stream_reset(ospf->ibuf); | |
2842 | if (!(ibuf = ospf_recv_packet(ospf->fd, &ifp, ospf->ibuf))) | |
2843 | return -1; | |
2844 | /* This raw packet is known to be at least as big as its IP header. */ | |
2845 | ||
2846 | /* Note that there should not be alignment problems with this assignment | |
2847 | because this is at the beginning of the stream data buffer. */ | |
2848 | iph = (struct ip *)STREAM_DATA(ibuf); | |
2849 | /* Note that sockopt_iphdrincl_swab_systoh was called in | |
2850 | * ospf_recv_packet. */ | |
2851 | ||
2852 | if (ifp == NULL) { | |
2853 | /* Handle cases where the platform does not support retrieving | |
2854 | the ifindex, | |
2855 | and also platforms (such as Solaris 8) that claim to support | |
2856 | ifindex | |
2857 | retrieval but do not. */ | |
2858 | c = if_lookup_address((void *)&iph->ip_src, AF_INET, | |
2859 | VRF_DEFAULT); | |
2860 | if (c) | |
2861 | ifp = c->ifp; | |
2862 | if (ifp == NULL) | |
2863 | return 0; | |
2864 | } | |
2865 | ||
2866 | /* IP Header dump. */ | |
2867 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2868 | ospf_ip_header_dump(iph); | |
2869 | ||
2870 | /* Self-originated packet should be discarded silently. */ | |
2871 | if (ospf_if_lookup_by_local_addr(ospf, NULL, iph->ip_src)) { | |
2872 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) { | |
2873 | zlog_debug( | |
2874 | "ospf_read[%s]: Dropping self-originated packet", | |
2875 | inet_ntoa(iph->ip_src)); | |
2876 | } | |
2877 | return 0; | |
2878 | } | |
2879 | ||
2880 | /* Advance from IP header to OSPF header (iph->ip_hl has been verified | |
2881 | by ospf_recv_packet() to be correct). */ | |
2882 | stream_forward_getp(ibuf, iph->ip_hl * 4); | |
2883 | ||
2884 | ospfh = (struct ospf_header *)STREAM_PNT(ibuf); | |
2885 | if (MSG_OK | |
2886 | != ospf_packet_examin( | |
2887 | ospfh, stream_get_endp(ibuf) - stream_get_getp(ibuf))) | |
2888 | return -1; | |
2889 | /* Now it is safe to access all fields of OSPF packet header. */ | |
2890 | ||
2891 | /* associate packet with ospf interface */ | |
2892 | oi = ospf_if_lookup_recv_if(ospf, iph->ip_src, ifp); | |
2893 | ||
2894 | /* ospf_verify_header() relies on a valid "oi" and thus can be called | |
2895 | only | |
2896 | after the passive/backbone/other checks below are passed. These | |
2897 | checks | |
2898 | in turn access the fields of unverified "ospfh" structure for their | |
2899 | own | |
2900 | purposes and must remain very accurate in doing this. */ | |
2901 | ||
2902 | /* If incoming interface is passive one, ignore it. */ | |
2903 | if (oi && OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) { | |
2904 | char buf[3][INET_ADDRSTRLEN]; | |
2905 | ||
2906 | if (IS_DEBUG_OSPF_EVENT) | |
2907 | zlog_debug( | |
2908 | "ignoring packet from router %s sent to %s, " | |
2909 | "received on a passive interface, %s", | |
2910 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], | |
2911 | sizeof(buf[0])), | |
2912 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], | |
2913 | sizeof(buf[1])), | |
2914 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
2915 | buf[2], sizeof(buf[2]))); | |
2916 | ||
2917 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) { | |
2918 | /* Try to fix multicast membership. | |
2919 | * Some OS:es may have problems in this area, | |
2920 | * make sure it is removed. | |
2921 | */ | |
2922 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
2923 | ospf_if_set_multicast(oi); | |
2924 | } | |
2925 | return 0; | |
2926 | } | |
2927 | ||
2928 | ||
2929 | /* if no local ospf_interface, | |
2930 | * or header area is backbone but ospf_interface is not | |
2931 | * check for VLINK interface | |
2932 | */ | |
2933 | if ((oi == NULL) || (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) | |
2934 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id))) { | |
2935 | if ((oi = ospf_associate_packet_vl(ospf, ifp, iph, ospfh)) | |
2936 | == NULL) { | |
2937 | if (!ospf->instance && IS_DEBUG_OSPF_EVENT) | |
2938 | zlog_debug( | |
2939 | "Packet from [%s] received on link %s" | |
2940 | " but no ospf_interface", | |
2941 | inet_ntoa(iph->ip_src), ifp->name); | |
2942 | return 0; | |
2943 | } | |
2944 | } | |
2945 | ||
2946 | /* else it must be a local ospf interface, check it was received on | |
2947 | * correct link | |
2948 | */ | |
2949 | else if (oi->ifp != ifp) { | |
2950 | if (IS_DEBUG_OSPF_EVENT) | |
2951 | zlog_warn("Packet from [%s] received on wrong link %s", | |
2952 | inet_ntoa(iph->ip_src), ifp->name); | |
2953 | return 0; | |
2954 | } else if (oi->state == ISM_Down) { | |
2955 | char buf[2][INET_ADDRSTRLEN]; | |
2956 | zlog_warn( | |
2957 | "Ignoring packet from %s to %s received on interface that is " | |
2958 | "down [%s]; interface flags are %s", | |
2959 | inet_ntop(AF_INET, &iph->ip_src, buf[0], | |
2960 | sizeof(buf[0])), | |
2961 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], | |
2962 | sizeof(buf[1])), | |
2963 | ifp->name, if_flag_dump(ifp->flags)); | |
2964 | /* Fix multicast memberships? */ | |
2965 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
2966 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); | |
2967 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) | |
2968 | OI_MEMBER_JOINED(oi, MEMBER_DROUTERS); | |
2969 | if (oi->multicast_memberships) | |
2970 | ospf_if_set_multicast(oi); | |
2971 | return 0; | |
2972 | } | |
2973 | ||
2974 | /* | |
2975 | * If the received packet is destined for AllDRouters, the packet | |
2976 | * should be accepted only if the received ospf interface state is | |
2977 | * either DR or Backup -- endo. | |
2978 | */ | |
2979 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS) | |
2980 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) { | |
2981 | zlog_warn( | |
2982 | "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", | |
2983 | inet_ntoa(iph->ip_src), IF_NAME(oi), | |
2984 | lookup_msg(ospf_ism_state_msg, oi->state, NULL)); | |
2985 | /* Try to fix multicast membership. */ | |
2986 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
2987 | ospf_if_set_multicast(oi); | |
2988 | return 0; | |
2989 | } | |
2990 | ||
2991 | /* Verify more OSPF header fields. */ | |
2992 | ret = ospf_verify_header(ibuf, oi, iph, ospfh); | |
2993 | if (ret < 0) { | |
2994 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) | |
2995 | zlog_debug( | |
2996 | "ospf_read[%s]: Header check failed, " | |
2997 | "dropping.", | |
2998 | inet_ntoa(iph->ip_src)); | |
2999 | return ret; | |
3000 | } | |
3001 | ||
3002 | /* Show debug receiving packet. */ | |
3003 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, RECV)) { | |
3004 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, DETAIL)) { | |
3005 | zlog_debug( | |
3006 | "-----------------------------------------------------"); | |
3007 | ospf_packet_dump(ibuf); | |
3008 | } | |
3009 | ||
3010 | zlog_debug("%s received from [%s] via [%s]", | |
3011 | lookup_msg(ospf_packet_type_str, ospfh->type, NULL), | |
3012 | inet_ntoa(ospfh->router_id), IF_NAME(oi)); | |
3013 | zlog_debug(" src [%s],", inet_ntoa(iph->ip_src)); | |
3014 | zlog_debug(" dst [%s]", inet_ntoa(iph->ip_dst)); | |
3015 | ||
3016 | if (IS_DEBUG_OSPF_PACKET(ospfh->type - 1, DETAIL)) | |
3017 | zlog_debug( | |
3018 | "-----------------------------------------------------"); | |
3019 | } | |
3020 | ||
3021 | stream_forward_getp(ibuf, OSPF_HEADER_SIZE); | |
3022 | ||
3023 | /* Adjust size to message length. */ | |
3024 | length = ntohs(ospfh->length) - OSPF_HEADER_SIZE; | |
3025 | ||
3026 | /* Read rest of the packet and call each sort of packet routine. */ | |
3027 | switch (ospfh->type) { | |
3028 | case OSPF_MSG_HELLO: | |
3029 | ospf_hello(iph, ospfh, ibuf, oi, length); | |
3030 | break; | |
3031 | case OSPF_MSG_DB_DESC: | |
3032 | ospf_db_desc(iph, ospfh, ibuf, oi, length); | |
3033 | break; | |
3034 | case OSPF_MSG_LS_REQ: | |
3035 | ospf_ls_req(iph, ospfh, ibuf, oi, length); | |
3036 | break; | |
3037 | case OSPF_MSG_LS_UPD: | |
3038 | ospf_ls_upd(ospf, iph, ospfh, ibuf, oi, length); | |
3039 | break; | |
3040 | case OSPF_MSG_LS_ACK: | |
3041 | ospf_ls_ack(iph, ospfh, ibuf, oi, length); | |
3042 | break; | |
3043 | default: | |
3044 | zlog_warn("interface %s: OSPF packet header type %d is illegal", | |
3045 | IF_NAME(oi), ospfh->type); | |
3046 | break; | |
3047 | } | |
3048 | ||
b10ce841 | 3049 | return 0; |
718e3744 | 3050 | } |
3051 | ||
3052 | /* Make OSPF header. */ | |
ac4d0be5 | 3053 | static void ospf_make_header(int type, struct ospf_interface *oi, |
3054 | struct stream *s) | |
718e3744 | 3055 | { |
ac4d0be5 | 3056 | struct ospf_header *ospfh; |
718e3744 | 3057 | |
ac4d0be5 | 3058 | ospfh = (struct ospf_header *)STREAM_DATA(s); |
718e3744 | 3059 | |
ac4d0be5 | 3060 | ospfh->version = (u_char)OSPF_VERSION; |
3061 | ospfh->type = (u_char)type; | |
718e3744 | 3062 | |
ac4d0be5 | 3063 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 3064 | |
ac4d0be5 | 3065 | ospfh->checksum = 0; |
3066 | ospfh->area_id = oi->area->area_id; | |
3067 | ospfh->auth_type = htons(ospf_auth_type(oi)); | |
718e3744 | 3068 | |
ac4d0be5 | 3069 | memset(ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); |
718e3744 | 3070 | |
ac4d0be5 | 3071 | stream_forward_endp(s, OSPF_HEADER_SIZE); |
718e3744 | 3072 | } |
3073 | ||
3074 | /* Make Authentication Data. */ | |
ac4d0be5 | 3075 | static int ospf_make_auth(struct ospf_interface *oi, struct ospf_header *ospfh) |
3076 | { | |
3077 | struct crypt_key *ck; | |
3078 | ||
3079 | switch (ospf_auth_type(oi)) { | |
3080 | case OSPF_AUTH_NULL: | |
3081 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); | |
3082 | */ | |
3083 | break; | |
3084 | case OSPF_AUTH_SIMPLE: | |
3085 | memcpy(ospfh->u.auth_data, OSPF_IF_PARAM(oi, auth_simple), | |
3086 | OSPF_AUTH_SIMPLE_SIZE); | |
3087 | break; | |
3088 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
3089 | /* If key is not set, then set 0. */ | |
3090 | if (list_isempty(OSPF_IF_PARAM(oi, auth_crypt))) { | |
3091 | ospfh->u.crypt.zero = 0; | |
3092 | ospfh->u.crypt.key_id = 0; | |
3093 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3094 | } else { | |
3095 | ck = listgetdata( | |
3096 | listtail(OSPF_IF_PARAM(oi, auth_crypt))); | |
3097 | ospfh->u.crypt.zero = 0; | |
3098 | ospfh->u.crypt.key_id = ck->key_id; | |
3099 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
3100 | } | |
3101 | /* note: the seq is done in ospf_make_md5_digest() */ | |
3102 | break; | |
3103 | default: | |
3104 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); | |
3105 | */ | |
3106 | break; | |
718e3744 | 3107 | } |
718e3744 | 3108 | |
ac4d0be5 | 3109 | return 0; |
718e3744 | 3110 | } |
3111 | ||
3112 | /* Fill rest of OSPF header. */ | |
ac4d0be5 | 3113 | static void ospf_fill_header(struct ospf_interface *oi, struct stream *s, |
3114 | u_int16_t length) | |
3115 | { | |
3116 | struct ospf_header *ospfh; | |
3117 | ||
3118 | ospfh = (struct ospf_header *)STREAM_DATA(s); | |
3119 | ||
3120 | /* Fill length. */ | |
3121 | ospfh->length = htons(length); | |
3122 | ||
3123 | /* Calculate checksum. */ | |
3124 | if (ntohs(ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
3125 | ospfh->checksum = in_cksum(ospfh, length); | |
3126 | else | |
3127 | ospfh->checksum = 0; | |
3128 | ||
3129 | /* Add Authentication Data. */ | |
3130 | ospf_make_auth(oi, ospfh); | |
3131 | } | |
3132 | ||
3133 | static int ospf_make_hello(struct ospf_interface *oi, struct stream *s) | |
3134 | { | |
3135 | struct ospf_neighbor *nbr; | |
3136 | struct route_node *rn; | |
3137 | u_int16_t length = OSPF_HELLO_MIN_SIZE; | |
3138 | struct in_addr mask; | |
3139 | unsigned long p; | |
3140 | int flag = 0; | |
3141 | ||
3142 | /* Set netmask of interface. */ | |
3143 | if (!(CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED) | |
3144 | && oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3145 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
3146 | masklen2ip(oi->address->prefixlen, &mask); | |
3147 | else | |
3148 | memset((char *)&mask, 0, sizeof(struct in_addr)); | |
3149 | stream_put_ipv4(s, mask.s_addr); | |
3150 | ||
3151 | /* Set Hello Interval. */ | |
3152 | if (OSPF_IF_PARAM(oi, fast_hello) == 0) | |
3153 | stream_putw(s, OSPF_IF_PARAM(oi, v_hello)); | |
3154 | else | |
3155 | stream_putw(s, 0); /* hello-interval of 0 for fast-hellos */ | |
3156 | ||
3157 | if (IS_DEBUG_OSPF_EVENT) | |
3158 | zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi), | |
3159 | IF_NAME(oi)); | |
3160 | ||
3161 | /* Set Options. */ | |
3162 | stream_putc(s, OPTIONS(oi)); | |
3163 | ||
3164 | /* Set Router Priority. */ | |
3165 | stream_putc(s, PRIORITY(oi)); | |
3166 | ||
3167 | /* Set Router Dead Interval. */ | |
3168 | stream_putl(s, OSPF_IF_PARAM(oi, v_wait)); | |
3169 | ||
3170 | /* Set Designated Router. */ | |
3171 | stream_put_ipv4(s, DR(oi).s_addr); | |
3172 | ||
3173 | p = stream_get_endp(s); | |
3174 | ||
3175 | /* Set Backup Designated Router. */ | |
3176 | stream_put_ipv4(s, BDR(oi).s_addr); | |
3177 | ||
3178 | /* Add neighbor seen. */ | |
3179 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3180 | if ((nbr = rn->info)) | |
3181 | if (nbr->router_id.s_addr | |
3182 | != 0) /* Ignore 0.0.0.0 node. */ | |
3183 | if (nbr->state | |
3184 | != NSM_Attempt) /* Ignore Down neighbor. */ | |
3185 | if (nbr->state | |
3186 | != NSM_Down) /* This is myself for | |
3187 | DR election. */ | |
3188 | if (!IPV4_ADDR_SAME( | |
3189 | &nbr->router_id, | |
3190 | &oi->ospf->router_id)) { | |
3191 | /* Check neighbor is | |
3192 | * sane? */ | |
3193 | if (nbr->d_router.s_addr | |
3194 | != 0 | |
3195 | && IPV4_ADDR_SAME( | |
3196 | &nbr->d_router, | |
3197 | &oi->address | |
3198 | ->u | |
3199 | .prefix4) | |
3200 | && IPV4_ADDR_SAME( | |
3201 | &nbr->bd_router, | |
3202 | &oi->address | |
3203 | ->u | |
3204 | .prefix4)) | |
3205 | flag = 1; | |
3206 | ||
3207 | stream_put_ipv4( | |
3208 | s, | |
3209 | nbr->router_id | |
3210 | .s_addr); | |
3211 | length += 4; | |
3212 | } | |
3213 | ||
3214 | /* Let neighbor generate BackupSeen. */ | |
3215 | if (flag == 1) | |
3216 | stream_putl_at(s, p, 0); /* ipv4 address, normally */ | |
3217 | ||
3218 | return length; | |
3219 | } | |
3220 | ||
3221 | static int ospf_make_db_desc(struct ospf_interface *oi, | |
3222 | struct ospf_neighbor *nbr, struct stream *s) | |
3223 | { | |
3224 | struct ospf_lsa *lsa; | |
3225 | u_int16_t length = OSPF_DB_DESC_MIN_SIZE; | |
3226 | u_char options; | |
3227 | unsigned long pp; | |
3228 | int i; | |
3229 | struct ospf_lsdb *lsdb; | |
3230 | ||
3231 | /* Set Interface MTU. */ | |
3232 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3233 | stream_putw(s, 0); | |
3234 | else | |
3235 | stream_putw(s, oi->ifp->mtu); | |
3236 | ||
3237 | /* Set Options. */ | |
3238 | options = OPTIONS(oi); | |
3239 | if (CHECK_FLAG(oi->ospf->config, OSPF_OPAQUE_CAPABLE)) | |
3240 | SET_FLAG(options, OSPF_OPTION_O); | |
3241 | stream_putc(s, options); | |
3242 | ||
3243 | /* DD flags */ | |
3244 | pp = stream_get_endp(s); | |
3245 | stream_putc(s, nbr->dd_flags); | |
3246 | ||
3247 | /* Set DD Sequence Number. */ | |
3248 | stream_putl(s, nbr->dd_seqnum); | |
3249 | ||
3250 | /* shortcut unneeded walk of (empty) summary LSDBs */ | |
3251 | if (ospf_db_summary_isempty(nbr)) | |
3252 | goto empty; | |
3253 | ||
3254 | /* Describe LSA Header from Database Summary List. */ | |
3255 | lsdb = &nbr->db_sum; | |
3256 | ||
3257 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { | |
3258 | struct route_table *table = lsdb->type[i].db; | |
3259 | struct route_node *rn; | |
3260 | ||
3261 | for (rn = route_top(table); rn; rn = route_next(rn)) | |
3262 | if ((lsa = rn->info) != NULL) { | |
3263 | if (IS_OPAQUE_LSA(lsa->data->type) | |
3264 | && (!CHECK_FLAG(options, OSPF_OPTION_O))) { | |
3265 | /* Suppress advertising | |
3266 | * opaque-informations. */ | |
3267 | /* Remove LSA from DB summary list. */ | |
3268 | ospf_lsdb_delete(lsdb, lsa); | |
3269 | continue; | |
3270 | } | |
3271 | ||
3272 | if (!CHECK_FLAG(lsa->flags, OSPF_LSA_DISCARD)) { | |
3273 | struct lsa_header *lsah; | |
3274 | u_int16_t ls_age; | |
3275 | ||
3276 | /* DD packet overflows interface MTU. */ | |
3277 | if (length + OSPF_LSA_HEADER_SIZE | |
3278 | > ospf_packet_max(oi)) | |
3279 | break; | |
3280 | ||
3281 | /* Keep pointer to LS age. */ | |
3282 | lsah = (struct lsa_header | |
3283 | *)(STREAM_DATA(s) | |
3284 | + stream_get_endp( | |
3285 | s)); | |
3286 | ||
3287 | /* Proceed stream pointer. */ | |
3288 | stream_put(s, lsa->data, | |
3289 | OSPF_LSA_HEADER_SIZE); | |
3290 | length += OSPF_LSA_HEADER_SIZE; | |
3291 | ||
3292 | /* Set LS age. */ | |
3293 | ls_age = LS_AGE(lsa); | |
3294 | lsah->ls_age = htons(ls_age); | |
3295 | } | |
3296 | ||
3297 | /* Remove LSA from DB summary list. */ | |
3298 | ospf_lsdb_delete(lsdb, lsa); | |
3299 | } | |
3300 | } | |
718e3744 | 3301 | |
ac4d0be5 | 3302 | /* Update 'More' bit */ |
3303 | if (ospf_db_summary_isempty(nbr)) { | |
3304 | empty: | |
3305 | if (nbr->state >= NSM_Exchange) { | |
3306 | UNSET_FLAG(nbr->dd_flags, OSPF_DD_FLAG_M); | |
3307 | /* Rewrite DD flags */ | |
3308 | stream_putc_at(s, pp, nbr->dd_flags); | |
3309 | } else { | |
3310 | assert(IS_SET_DD_M(nbr->dd_flags)); | |
3311 | } | |
3312 | } | |
3313 | return length; | |
3314 | } | |
86f1fd96 | 3315 | |
ac4d0be5 | 3316 | static int ospf_make_ls_req_func(struct stream *s, u_int16_t *length, |
3317 | unsigned long delta, struct ospf_neighbor *nbr, | |
3318 | struct ospf_lsa *lsa) | |
3319 | { | |
3320 | struct ospf_interface *oi; | |
718e3744 | 3321 | |
ac4d0be5 | 3322 | oi = nbr->oi; |
718e3744 | 3323 | |
ac4d0be5 | 3324 | /* LS Request packet overflows interface MTU. */ |
3325 | if (*length + delta > ospf_packet_max(oi)) | |
3326 | return 0; | |
1eb8ef25 | 3327 | |
ac4d0be5 | 3328 | stream_putl(s, lsa->data->type); |
3329 | stream_put_ipv4(s, lsa->data->id.s_addr); | |
3330 | stream_put_ipv4(s, lsa->data->adv_router.s_addr); | |
718e3744 | 3331 | |
ac4d0be5 | 3332 | ospf_lsa_unlock(&nbr->ls_req_last); |
3333 | nbr->ls_req_last = ospf_lsa_lock(lsa); | |
59ea14c6 | 3334 | |
ac4d0be5 | 3335 | *length += 12; |
3336 | return 1; | |
3337 | } | |
718e3744 | 3338 | |
ac4d0be5 | 3339 | static int ospf_make_ls_req(struct ospf_neighbor *nbr, struct stream *s) |
3340 | { | |
3341 | struct ospf_lsa *lsa; | |
3342 | u_int16_t length = OSPF_LS_REQ_MIN_SIZE; | |
3343 | unsigned long delta = stream_get_endp(s) + 12; | |
3344 | struct route_table *table; | |
3345 | struct route_node *rn; | |
3346 | int i; | |
3347 | struct ospf_lsdb *lsdb; | |
718e3744 | 3348 | |
ac4d0be5 | 3349 | lsdb = &nbr->ls_req; |
718e3744 | 3350 | |
ac4d0be5 | 3351 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) { |
3352 | table = lsdb->type[i].db; | |
3353 | for (rn = route_top(table); rn; rn = route_next(rn)) | |
3354 | if ((lsa = (rn->info)) != NULL) | |
3355 | if (ospf_make_ls_req_func(s, &length, delta, | |
3356 | nbr, lsa) | |
3357 | == 0) { | |
3358 | route_unlock_node(rn); | |
3359 | break; | |
3360 | } | |
3361 | } | |
3362 | return length; | |
3363 | } | |
718e3744 | 3364 | |
ac4d0be5 | 3365 | static int ls_age_increment(struct ospf_lsa *lsa, int delay) |
3366 | { | |
3367 | int age; | |
718e3744 | 3368 | |
ac4d0be5 | 3369 | age = IS_LSA_MAXAGE(lsa) ? OSPF_LSA_MAXAGE : LS_AGE(lsa) + delay; |
718e3744 | 3370 | |
ac4d0be5 | 3371 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); |
718e3744 | 3372 | } |
3373 | ||
ac4d0be5 | 3374 | static int ospf_make_ls_upd(struct ospf_interface *oi, struct list *update, |
3375 | struct stream *s) | |
718e3744 | 3376 | { |
ac4d0be5 | 3377 | struct ospf_lsa *lsa; |
3378 | struct listnode *node; | |
3379 | u_int16_t length = 0; | |
3380 | unsigned int size_noauth; | |
3381 | unsigned long delta = stream_get_endp(s); | |
3382 | unsigned long pp; | |
3383 | int count = 0; | |
3384 | ||
3385 | if (IS_DEBUG_OSPF_EVENT) | |
3386 | zlog_debug("ospf_make_ls_upd: Start"); | |
3387 | ||
3388 | pp = stream_get_endp(s); | |
3389 | stream_forward_endp(s, OSPF_LS_UPD_MIN_SIZE); | |
3390 | length += OSPF_LS_UPD_MIN_SIZE; | |
3391 | ||
3392 | /* Calculate amount of packet usable for data. */ | |
3393 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
3394 | ||
3395 | while ((node = listhead(update)) != NULL) { | |
3396 | struct lsa_header *lsah; | |
3397 | u_int16_t ls_age; | |
3398 | ||
3399 | if (IS_DEBUG_OSPF_EVENT) | |
3400 | zlog_debug("ospf_make_ls_upd: List Iteration %d", | |
3401 | count); | |
3402 | ||
3403 | lsa = listgetdata(node); | |
3404 | ||
3405 | assert(lsa->data); | |
3406 | ||
3407 | /* Will it fit? */ | |
3408 | if (length + delta + ntohs(lsa->data->length) > size_noauth) | |
3409 | break; | |
3410 | ||
3411 | /* Keep pointer to LS age. */ | |
3412 | lsah = (struct lsa_header *)(STREAM_DATA(s) | |
3413 | + stream_get_endp(s)); | |
3414 | ||
3415 | /* Put LSA to Link State Request. */ | |
3416 | stream_put(s, lsa->data, ntohs(lsa->data->length)); | |
718e3744 | 3417 | |
ac4d0be5 | 3418 | /* Set LS age. */ |
3419 | /* each hop must increment an lsa_age by transmit_delay | |
3420 | of OSPF interface */ | |
3421 | ls_age = ls_age_increment(lsa, | |
3422 | OSPF_IF_PARAM(oi, transmit_delay)); | |
3423 | lsah->ls_age = htons(ls_age); | |
3424 | ||
3425 | length += ntohs(lsa->data->length); | |
3426 | count++; | |
3427 | ||
3428 | list_delete_node(update, node); | |
3429 | ospf_lsa_unlock(&lsa); /* oi->ls_upd_queue */ | |
3430 | } | |
3431 | ||
3432 | /* Now set #LSAs. */ | |
3433 | stream_putl_at(s, pp, count); | |
3434 | ||
3435 | if (IS_DEBUG_OSPF_EVENT) | |
3436 | zlog_debug("ospf_make_ls_upd: Stop"); | |
3437 | return length; | |
718e3744 | 3438 | } |
3439 | ||
ac4d0be5 | 3440 | static int ospf_make_ls_ack(struct ospf_interface *oi, struct list *ack, |
3441 | struct stream *s) | |
718e3744 | 3442 | { |
ac4d0be5 | 3443 | struct listnode *node, *nnode; |
3444 | u_int16_t length = OSPF_LS_ACK_MIN_SIZE; | |
3445 | unsigned long delta = stream_get_endp(s) + 24; | |
3446 | struct ospf_lsa *lsa; | |
718e3744 | 3447 | |
ac4d0be5 | 3448 | for (ALL_LIST_ELEMENTS(ack, node, nnode, lsa)) { |
3449 | assert(lsa); | |
718e3744 | 3450 | |
ac4d0be5 | 3451 | if (length + delta > ospf_packet_max(oi)) |
3452 | break; | |
718e3744 | 3453 | |
ac4d0be5 | 3454 | stream_put(s, lsa->data, OSPF_LSA_HEADER_SIZE); |
3455 | length += OSPF_LSA_HEADER_SIZE; | |
3456 | ||
3457 | listnode_delete(ack, lsa); | |
3458 | ospf_lsa_unlock(&lsa); /* oi->ls_ack_direct.ls_ack */ | |
3459 | } | |
3460 | ||
3461 | return length; | |
3462 | } | |
3463 | ||
3464 | static void ospf_hello_send_sub(struct ospf_interface *oi, in_addr_t addr) | |
3465 | { | |
3466 | struct ospf_packet *op; | |
3467 | u_int16_t length = OSPF_HEADER_SIZE; | |
718e3744 | 3468 | |
ac4d0be5 | 3469 | op = ospf_packet_new(oi->ifp->mtu); |
718e3744 | 3470 | |
ac4d0be5 | 3471 | /* Prepare OSPF common header. */ |
3472 | ospf_make_header(OSPF_MSG_HELLO, oi, op->s); | |
718e3744 | 3473 | |
ac4d0be5 | 3474 | /* Prepare OSPF Hello body. */ |
3475 | length += ospf_make_hello(oi, op->s); | |
718e3744 | 3476 | |
ac4d0be5 | 3477 | /* Fill OSPF header. */ |
3478 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3479 | |
ac4d0be5 | 3480 | /* Set packet length. */ |
3481 | op->length = length; | |
3482 | ||
3483 | op->dst.s_addr = addr; | |
3484 | ||
3485 | /* Add packet to the top of the interface output queue, so that they | |
3486 | * can't get delayed by things like long queues of LS Update packets | |
3487 | */ | |
3488 | ospf_packet_add_top(oi, op); | |
3489 | ||
3490 | /* Hook thread to write packet. */ | |
3491 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3492 | } |
3493 | ||
ac4d0be5 | 3494 | static void ospf_poll_send(struct ospf_nbr_nbma *nbr_nbma) |
718e3744 | 3495 | { |
ac4d0be5 | 3496 | struct ospf_interface *oi; |
718e3744 | 3497 | |
ac4d0be5 | 3498 | oi = nbr_nbma->oi; |
3499 | assert(oi); | |
718e3744 | 3500 | |
ac4d0be5 | 3501 | /* If this is passive interface, do not send OSPF Hello. */ |
3502 | if (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) | |
3503 | return; | |
718e3744 | 3504 | |
ac4d0be5 | 3505 | if (oi->type != OSPF_IFTYPE_NBMA) |
3506 | return; | |
718e3744 | 3507 | |
ac4d0be5 | 3508 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) |
3509 | return; | |
718e3744 | 3510 | |
ac4d0be5 | 3511 | if (PRIORITY(oi) == 0) |
3512 | return; | |
718e3744 | 3513 | |
ac4d0be5 | 3514 | if (nbr_nbma->priority == 0 && oi->state != ISM_DR |
3515 | && oi->state != ISM_Backup) | |
3516 | return; | |
718e3744 | 3517 | |
ac4d0be5 | 3518 | ospf_hello_send_sub(oi, nbr_nbma->addr.s_addr); |
718e3744 | 3519 | } |
3520 | ||
ac4d0be5 | 3521 | int ospf_poll_timer(struct thread *thread) |
718e3744 | 3522 | { |
ac4d0be5 | 3523 | struct ospf_nbr_nbma *nbr_nbma; |
718e3744 | 3524 | |
ac4d0be5 | 3525 | nbr_nbma = THREAD_ARG(thread); |
3526 | nbr_nbma->t_poll = NULL; | |
718e3744 | 3527 | |
ac4d0be5 | 3528 | if (IS_DEBUG_OSPF(nsm, NSM_TIMERS)) |
3529 | zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)", | |
3530 | IF_NAME(nbr_nbma->oi), inet_ntoa(nbr_nbma->addr)); | |
718e3744 | 3531 | |
ac4d0be5 | 3532 | ospf_poll_send(nbr_nbma); |
718e3744 | 3533 | |
ac4d0be5 | 3534 | if (nbr_nbma->v_poll > 0) |
3535 | OSPF_POLL_TIMER_ON(nbr_nbma->t_poll, ospf_poll_timer, | |
3536 | nbr_nbma->v_poll); | |
718e3744 | 3537 | |
ac4d0be5 | 3538 | return 0; |
718e3744 | 3539 | } |
3540 | ||
3541 | ||
ac4d0be5 | 3542 | int ospf_hello_reply_timer(struct thread *thread) |
718e3744 | 3543 | { |
ac4d0be5 | 3544 | struct ospf_neighbor *nbr; |
718e3744 | 3545 | |
ac4d0be5 | 3546 | nbr = THREAD_ARG(thread); |
3547 | nbr->t_hello_reply = NULL; | |
718e3744 | 3548 | |
ac4d0be5 | 3549 | assert(nbr->oi); |
718e3744 | 3550 | |
ac4d0be5 | 3551 | if (IS_DEBUG_OSPF(nsm, NSM_TIMERS)) |
3552 | zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)", | |
3553 | IF_NAME(nbr->oi), inet_ntoa(nbr->router_id)); | |
718e3744 | 3554 | |
ac4d0be5 | 3555 | ospf_hello_send_sub(nbr->oi, nbr->address.u.prefix4.s_addr); |
718e3744 | 3556 | |
ac4d0be5 | 3557 | return 0; |
718e3744 | 3558 | } |
3559 | ||
3560 | /* Send OSPF Hello. */ | |
ac4d0be5 | 3561 | void ospf_hello_send(struct ospf_interface *oi) |
3562 | { | |
3563 | /* If this is passive interface, do not send OSPF Hello. */ | |
3564 | if (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_PASSIVE) | |
3565 | return; | |
3566 | ||
3567 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
3568 | struct ospf_neighbor *nbr; | |
3569 | struct route_node *rn; | |
3570 | ||
3571 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3572 | if ((nbr = rn->info)) | |
3573 | if (nbr != oi->nbr_self) | |
3574 | if (nbr->state != NSM_Down) { | |
3575 | /* RFC 2328 Section 9.5.1 | |
3576 | If the router is not | |
3577 | eligible to become Designated | |
3578 | Router, | |
3579 | it must periodically send | |
3580 | Hello Packets to both the | |
3581 | Designated Router and the | |
3582 | Backup Designated Router (if | |
3583 | they | |
3584 | exist). */ | |
3585 | if (PRIORITY(oi) == 0 | |
3586 | && IPV4_ADDR_CMP( | |
3587 | &DR(oi), | |
3588 | &nbr->address.u | |
3589 | .prefix4) | |
3590 | && IPV4_ADDR_CMP( | |
3591 | &BDR(oi), | |
3592 | &nbr->address.u | |
3593 | .prefix4)) | |
3594 | continue; | |
3595 | ||
3596 | /* If the router is eligible to | |
3597 | become Designated Router, it | |
3598 | must periodically send Hello | |
3599 | Packets to all neighbors that | |
3600 | are also eligible. In | |
3601 | addition, if the router is | |
3602 | itself the | |
3603 | Designated Router or Backup | |
3604 | Designated Router, it must | |
3605 | also | |
3606 | send periodic Hello Packets | |
3607 | to all other neighbors. */ | |
3608 | ||
3609 | if (nbr->priority == 0 | |
3610 | && oi->state == ISM_DROther) | |
3611 | continue; | |
3612 | /* if oi->state == Waiting, send | |
3613 | * hello to all neighbors */ | |
3614 | ospf_hello_send_sub( | |
3615 | oi, | |
3616 | nbr->address.u.prefix4 | |
3617 | .s_addr); | |
3618 | } | |
3619 | } else { | |
3620 | /* Decide destination address. */ | |
3621 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3622 | ospf_hello_send_sub(oi, oi->vl_data->peer_addr.s_addr); | |
3623 | else | |
3624 | ospf_hello_send_sub(oi, htonl(OSPF_ALLSPFROUTERS)); | |
3625 | } | |
718e3744 | 3626 | } |
3627 | ||
3628 | /* Send OSPF Database Description. */ | |
ac4d0be5 | 3629 | void ospf_db_desc_send(struct ospf_neighbor *nbr) |
718e3744 | 3630 | { |
ac4d0be5 | 3631 | struct ospf_interface *oi; |
3632 | struct ospf_packet *op; | |
3633 | u_int16_t length = OSPF_HEADER_SIZE; | |
718e3744 | 3634 | |
ac4d0be5 | 3635 | oi = nbr->oi; |
3636 | op = ospf_packet_new(oi->ifp->mtu); | |
718e3744 | 3637 | |
ac4d0be5 | 3638 | /* Prepare OSPF common header. */ |
3639 | ospf_make_header(OSPF_MSG_DB_DESC, oi, op->s); | |
718e3744 | 3640 | |
ac4d0be5 | 3641 | /* Prepare OSPF Database Description body. */ |
3642 | length += ospf_make_db_desc(oi, nbr, op->s); | |
718e3744 | 3643 | |
ac4d0be5 | 3644 | /* Fill OSPF header. */ |
3645 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3646 | |
ac4d0be5 | 3647 | /* Set packet length. */ |
3648 | op->length = length; | |
718e3744 | 3649 | |
ac4d0be5 | 3650 | /* Decide destination address. */ |
3651 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3652 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3653 | else | |
3654 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3655 | |
ac4d0be5 | 3656 | /* Add packet to the interface output queue. */ |
3657 | ospf_packet_add(oi, op); | |
718e3744 | 3658 | |
ac4d0be5 | 3659 | /* Hook thread to write packet. */ |
3660 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3661 | |
ac4d0be5 | 3662 | /* Remove old DD packet, then copy new one and keep in neighbor |
3663 | * structure. */ | |
3664 | if (nbr->last_send) | |
3665 | ospf_packet_free(nbr->last_send); | |
3666 | nbr->last_send = ospf_packet_dup(op); | |
3667 | monotime(&nbr->last_send_ts); | |
718e3744 | 3668 | } |
3669 | ||
3670 | /* Re-send Database Description. */ | |
ac4d0be5 | 3671 | void ospf_db_desc_resend(struct ospf_neighbor *nbr) |
718e3744 | 3672 | { |
ac4d0be5 | 3673 | struct ospf_interface *oi; |
718e3744 | 3674 | |
ac4d0be5 | 3675 | oi = nbr->oi; |
718e3744 | 3676 | |
ac4d0be5 | 3677 | /* Add packet to the interface output queue. */ |
3678 | ospf_packet_add(oi, ospf_packet_dup(nbr->last_send)); | |
718e3744 | 3679 | |
ac4d0be5 | 3680 | /* Hook thread to write packet. */ |
3681 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3682 | } |
3683 | ||
3684 | /* Send Link State Request. */ | |
ac4d0be5 | 3685 | void ospf_ls_req_send(struct ospf_neighbor *nbr) |
718e3744 | 3686 | { |
ac4d0be5 | 3687 | struct ospf_interface *oi; |
3688 | struct ospf_packet *op; | |
3689 | u_int16_t length = OSPF_HEADER_SIZE; | |
718e3744 | 3690 | |
ac4d0be5 | 3691 | oi = nbr->oi; |
3692 | op = ospf_packet_new(oi->ifp->mtu); | |
718e3744 | 3693 | |
ac4d0be5 | 3694 | /* Prepare OSPF common header. */ |
3695 | ospf_make_header(OSPF_MSG_LS_REQ, oi, op->s); | |
718e3744 | 3696 | |
ac4d0be5 | 3697 | /* Prepare OSPF Link State Request body. */ |
3698 | length += ospf_make_ls_req(nbr, op->s); | |
3699 | if (length == OSPF_HEADER_SIZE) { | |
3700 | ospf_packet_free(op); | |
3701 | return; | |
3702 | } | |
718e3744 | 3703 | |
ac4d0be5 | 3704 | /* Fill OSPF header. */ |
3705 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3706 | |
ac4d0be5 | 3707 | /* Set packet length. */ |
3708 | op->length = length; | |
718e3744 | 3709 | |
ac4d0be5 | 3710 | /* Decide destination address. */ |
3711 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3712 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3713 | else | |
3714 | op->dst = nbr->address.u.prefix4; | |
718e3744 | 3715 | |
ac4d0be5 | 3716 | /* Add packet to the interface output queue. */ |
3717 | ospf_packet_add(oi, op); | |
718e3744 | 3718 | |
ac4d0be5 | 3719 | /* Hook thread to write packet. */ |
3720 | OSPF_ISM_WRITE_ON(oi->ospf); | |
718e3744 | 3721 | |
ac4d0be5 | 3722 | /* Add Link State Request Retransmission Timer. */ |
3723 | OSPF_NSM_TIMER_ON(nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
718e3744 | 3724 | } |
3725 | ||
3726 | /* Send Link State Update with an LSA. */ | |
ac4d0be5 | 3727 | void ospf_ls_upd_send_lsa(struct ospf_neighbor *nbr, struct ospf_lsa *lsa, |
3728 | int flag) | |
718e3744 | 3729 | { |
ac4d0be5 | 3730 | struct list *update; |
718e3744 | 3731 | |
ac4d0be5 | 3732 | update = list_new(); |
718e3744 | 3733 | |
ac4d0be5 | 3734 | listnode_add(update, lsa); |
3735 | ospf_ls_upd_send(nbr, update, flag); | |
718e3744 | 3736 | |
ac4d0be5 | 3737 | list_delete(update); |
718e3744 | 3738 | } |
3739 | ||
68b7339a | 3740 | /* Determine size for packet. Must be at least big enough to accomodate next |
3741 | * LSA on list, which may be bigger than MTU size. | |
3742 | * | |
3743 | * Return pointer to new ospf_packet | |
3744 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3745 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3746 | */ | |
ac4d0be5 | 3747 | static struct ospf_packet *ospf_ls_upd_packet_new(struct list *update, |
3748 | struct ospf_interface *oi) | |
3749 | { | |
3750 | struct ospf_lsa *lsa; | |
3751 | struct listnode *ln; | |
3752 | size_t size; | |
3753 | static char warned = 0; | |
3754 | ||
3755 | lsa = listgetdata((ln = listhead(update))); | |
3756 | assert(lsa->data); | |
3757 | ||
3758 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs(lsa->data->length)) | |
3759 | > ospf_packet_max(oi)) { | |
3760 | if (!warned) { | |
3761 | zlog_warn( | |
3762 | "ospf_ls_upd_packet_new: oversized LSA encountered!" | |
3763 | "will need to fragment. Not optimal. Try divide up" | |
3764 | " your network with areas. Use 'debug ospf packet send'" | |
3765 | " to see details, or look at 'show ip ospf database ..'"); | |
3766 | warned = 1; | |
3767 | } | |
3768 | ||
3769 | if (IS_DEBUG_OSPF_PACKET(0, SEND)) | |
3770 | zlog_debug( | |
3771 | "ospf_ls_upd_packet_new: oversized LSA id:%s," | |
3772 | " %d bytes originated by %s, will be fragmented!", | |
3773 | inet_ntoa(lsa->data->id), | |
3774 | ntohs(lsa->data->length), | |
3775 | inet_ntoa(lsa->data->adv_router)); | |
3776 | ||
3777 | /* | |
3778 | * Allocate just enough to fit this LSA only, to avoid including | |
3779 | * other | |
3780 | * LSAs in fragmented LSA Updates. | |
3781 | */ | |
3782 | size = ntohs(lsa->data->length) | |
3783 | + (oi->ifp->mtu - ospf_packet_max(oi)) | |
3784 | + OSPF_LS_UPD_MIN_SIZE; | |
3785 | } else | |
3786 | size = oi->ifp->mtu; | |
3787 | ||
3788 | if (size > OSPF_MAX_PACKET_SIZE) { | |
3789 | zlog_warn( | |
3790 | "ospf_ls_upd_packet_new: oversized LSA id:%s too big," | |
3791 | " %d bytes, packet size %ld, dropping it completely." | |
3792 | " OSPF routing is broken!", | |
3793 | inet_ntoa(lsa->data->id), ntohs(lsa->data->length), | |
3794 | (long int)size); | |
3795 | list_delete_node(update, ln); | |
3796 | return NULL; | |
3797 | } | |
718e3744 | 3798 | |
ac4d0be5 | 3799 | /* IP header is built up separately by ospf_write(). This means, that we |
3800 | * must | |
3801 | * reduce the "affordable" size just calculated by length of an IP | |
3802 | * header. | |
3803 | * This makes sure, that even if we manage to fill the payload with LSA | |
3804 | * data | |
3805 | * completely, the final packet (our data plus IP header) still fits | |
3806 | * into | |
3807 | * outgoing interface MTU. This correction isn't really meaningful for | |
3808 | * an | |
3809 | * oversized LSA, but for consistency the correction is done for both | |
3810 | * cases. | |
3811 | * | |
3812 | * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size | |
3813 | */ | |
3814 | return ospf_packet_new(size - sizeof(struct ip)); | |
718e3744 | 3815 | } |
3816 | ||
ac4d0be5 | 3817 | static void ospf_ls_upd_queue_send(struct ospf_interface *oi, |
3818 | struct list *update, struct in_addr addr) | |
718e3744 | 3819 | { |
ac4d0be5 | 3820 | struct ospf_packet *op; |
3821 | u_int16_t length = OSPF_HEADER_SIZE; | |
3822 | ||
3823 | if (IS_DEBUG_OSPF_EVENT) | |
3824 | zlog_debug("listcount = %d, [%s]dst %s", listcount(update), | |
3825 | IF_NAME(oi), inet_ntoa(addr)); | |
3826 | ||
3827 | op = ospf_ls_upd_packet_new(update, oi); | |
718e3744 | 3828 | |
ac4d0be5 | 3829 | /* Prepare OSPF common header. */ |
3830 | ospf_make_header(OSPF_MSG_LS_UPD, oi, op->s); | |
718e3744 | 3831 | |
ac4d0be5 | 3832 | /* Prepare OSPF Link State Update body. |
3833 | * Includes Type-7 translation. | |
3834 | */ | |
3835 | length += ospf_make_ls_upd(oi, update, op->s); | |
3836 | ||
3837 | /* Fill OSPF header. */ | |
3838 | ospf_fill_header(oi, op->s, length); | |
3839 | ||
3840 | /* Set packet length. */ | |
3841 | op->length = length; | |
3842 | ||
3843 | /* Decide destination address. */ | |
3844 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3845 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3846 | else | |
3847 | op->dst.s_addr = addr.s_addr; | |
3848 | ||
3849 | /* Add packet to the interface output queue. */ | |
3850 | ospf_packet_add(oi, op); | |
3851 | ||
3852 | /* Hook thread to write packet. */ | |
3853 | OSPF_ISM_WRITE_ON(oi->ospf); | |
3854 | } | |
3855 | ||
3856 | static int ospf_ls_upd_send_queue_event(struct thread *thread) | |
3857 | { | |
3858 | struct ospf_interface *oi = THREAD_ARG(thread); | |
3859 | struct route_node *rn; | |
3860 | struct route_node *rnext; | |
3861 | struct list *update; | |
3862 | char again = 0; | |
3863 | ||
3864 | oi->t_ls_upd_event = NULL; | |
3865 | ||
3866 | if (IS_DEBUG_OSPF_EVENT) | |
3867 | zlog_debug("ospf_ls_upd_send_queue start"); | |
3868 | ||
3869 | for (rn = route_top(oi->ls_upd_queue); rn; rn = rnext) { | |
3870 | rnext = route_next(rn); | |
3871 | ||
3872 | if (rn->info == NULL) | |
3873 | continue; | |
3874 | ||
3875 | update = (struct list *)rn->info; | |
3876 | ||
3877 | ospf_ls_upd_queue_send(oi, update, rn->p.u.prefix4); | |
3878 | ||
3879 | /* list might not be empty. */ | |
3880 | if (listcount(update) == 0) { | |
3881 | list_delete(rn->info); | |
3882 | rn->info = NULL; | |
3883 | route_unlock_node(rn); | |
3884 | } else | |
3885 | again = 1; | |
3886 | } | |
3887 | ||
3888 | if (again != 0) { | |
3889 | if (IS_DEBUG_OSPF_EVENT) | |
3890 | zlog_debug( | |
3891 | "ospf_ls_upd_send_queue: update lists not cleared," | |
3892 | " %d nodes to try again, raising new event", | |
3893 | again); | |
3894 | oi->t_ls_upd_event = thread_add_event( | |
3895 | master, ospf_ls_upd_send_queue_event, oi, 0); | |
3896 | } | |
3897 | ||
3898 | if (IS_DEBUG_OSPF_EVENT) | |
3899 | zlog_debug("ospf_ls_upd_send_queue stop"); | |
3900 | ||
3901 | return 0; | |
3902 | } | |
3903 | ||
3904 | void ospf_ls_upd_send(struct ospf_neighbor *nbr, struct list *update, int flag) | |
3905 | { | |
3906 | struct ospf_interface *oi; | |
3907 | struct ospf_lsa *lsa; | |
3908 | struct prefix_ipv4 p; | |
3909 | struct route_node *rn; | |
3910 | struct listnode *node; | |
3911 | ||
3912 | oi = nbr->oi; | |
3913 | ||
3914 | p.family = AF_INET; | |
3915 | p.prefixlen = IPV4_MAX_BITLEN; | |
3916 | ||
3917 | /* Decide destination address. */ | |
3918 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3919 | p.prefix = oi->vl_data->peer_addr; | |
3920 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3921 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3922 | else if (flag == OSPF_SEND_PACKET_DIRECT) | |
3923 | p.prefix = nbr->address.u.prefix4; | |
3924 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3925 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3926 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) | |
3927 | p.prefix.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3928 | else | |
3929 | p.prefix.s_addr = htonl(OSPF_ALLDROUTERS); | |
3930 | ||
3931 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
3932 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
3933 | zlog_warn( | |
3934 | "* LS-Update is directly sent on NBMA network."); | |
3935 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix.s_addr)) | |
3936 | zlog_warn("* LS-Update is sent to myself."); | |
3937 | } | |
3938 | ||
3939 | rn = route_node_get(oi->ls_upd_queue, (struct prefix *)&p); | |
3940 | ||
3941 | if (rn->info == NULL) | |
3942 | rn->info = list_new(); | |
3943 | else | |
3944 | route_unlock_node(rn); | |
3945 | ||
3946 | for (ALL_LIST_ELEMENTS_RO(update, node, lsa)) | |
3947 | listnode_add(rn->info, | |
3948 | ospf_lsa_lock(lsa)); /* oi->ls_upd_queue */ | |
3949 | ||
3950 | if (oi->t_ls_upd_event == NULL) | |
3951 | oi->t_ls_upd_event = thread_add_event( | |
3952 | master, ospf_ls_upd_send_queue_event, oi, 0); | |
718e3744 | 3953 | } |
3954 | ||
ac4d0be5 | 3955 | static void ospf_ls_ack_send_list(struct ospf_interface *oi, struct list *ack, |
3956 | struct in_addr dst) | |
718e3744 | 3957 | { |
ac4d0be5 | 3958 | struct ospf_packet *op; |
3959 | u_int16_t length = OSPF_HEADER_SIZE; | |
3960 | ||
3961 | op = ospf_packet_new(oi->ifp->mtu); | |
3962 | ||
3963 | /* Prepare OSPF common header. */ | |
3964 | ospf_make_header(OSPF_MSG_LS_ACK, oi, op->s); | |
3965 | ||
3966 | /* Prepare OSPF Link State Acknowledgment body. */ | |
3967 | length += ospf_make_ls_ack(oi, ack, op->s); | |
3968 | ||
3969 | /* Fill OSPF header. */ | |
3970 | ospf_fill_header(oi, op->s, length); | |
718e3744 | 3971 | |
ac4d0be5 | 3972 | /* Set packet length. */ |
3973 | op->length = length; | |
3974 | ||
3975 | /* Decide destination address. */ | |
3976 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3977 | op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
3978 | else | |
3979 | op->dst.s_addr = dst.s_addr; | |
3980 | ||
3981 | /* Add packet to the interface output queue. */ | |
3982 | ospf_packet_add(oi, op); | |
3983 | ||
3984 | /* Hook thread to write packet. */ | |
3985 | OSPF_ISM_WRITE_ON(oi->ospf); | |
3986 | } | |
3987 | ||
3988 | static int ospf_ls_ack_send_event(struct thread *thread) | |
3989 | { | |
3990 | struct ospf_interface *oi = THREAD_ARG(thread); | |
3991 | ||
3992 | oi->t_ls_ack_direct = NULL; | |
3993 | ||
3994 | while (listcount(oi->ls_ack_direct.ls_ack)) | |
3995 | ospf_ls_ack_send_list(oi, oi->ls_ack_direct.ls_ack, | |
3996 | oi->ls_ack_direct.dst); | |
3997 | ||
3998 | return 0; | |
3999 | } | |
4000 | ||
4001 | void ospf_ls_ack_send(struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
4002 | { | |
4003 | struct ospf_interface *oi = nbr->oi; | |
4004 | ||
4005 | if (listcount(oi->ls_ack_direct.ls_ack) == 0) | |
4006 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
4007 | ||
4008 | listnode_add(oi->ls_ack_direct.ls_ack, ospf_lsa_lock(lsa)); | |
4009 | ||
4010 | if (oi->t_ls_ack_direct == NULL) | |
4011 | oi->t_ls_ack_direct = | |
4012 | thread_add_event(master, ospf_ls_ack_send_event, oi, 0); | |
718e3744 | 4013 | } |
4014 | ||
4015 | /* Send Link State Acknowledgment delayed. */ | |
ac4d0be5 | 4016 | void ospf_ls_ack_send_delayed(struct ospf_interface *oi) |
4017 | { | |
4018 | struct in_addr dst; | |
4019 | ||
4020 | /* Decide destination address. */ | |
4021 | /* RFC2328 Section 13.5 On non-broadcast | |
4022 | networks, delayed Link State Acknowledgment packets must be | |
4023 | unicast separately over each adjacency (i.e., neighbor whose | |
4024 | state is >= Exchange). */ | |
4025 | if (oi->type == OSPF_IFTYPE_NBMA) { | |
4026 | struct ospf_neighbor *nbr; | |
4027 | struct route_node *rn; | |
4028 | ||
4029 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
4030 | if ((nbr = rn->info) != NULL) | |
4031 | if (nbr != oi->nbr_self | |
4032 | && nbr->state >= NSM_Exchange) | |
4033 | while (listcount(oi->ls_ack)) | |
4034 | ospf_ls_ack_send_list( | |
4035 | oi, oi->ls_ack, | |
4036 | nbr->address.u.prefix4); | |
4037 | return; | |
4038 | } | |
4039 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
4040 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
4041 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
4042 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4043 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
4044 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4045 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) | |
4046 | dst.s_addr = htonl(OSPF_ALLSPFROUTERS); | |
4047 | else | |
4048 | dst.s_addr = htonl(OSPF_ALLDROUTERS); | |
4049 | ||
4050 | while (listcount(oi->ls_ack)) | |
4051 | ospf_ls_ack_send_list(oi, oi->ls_ack, dst); | |
718e3744 | 4052 | } |
8b6912c2 DS |
4053 | |
4054 | /* | |
4055 | * On pt-to-pt links, all OSPF control packets are sent to the multicast | |
4056 | * address. As a result, the kernel does not need to learn the interface | |
4057 | * MAC of the OSPF neighbor. However, in our world, this will delay | |
4058 | * convergence. Take the case when due to a link flap, all routes now | |
4059 | * want to use an interface which was deemed to be costlier prior to this | |
4060 | * event. For routes that will be installed, the missing MAC will have | |
4061 | * punt-to-CPU set on them. This may overload the CPU control path that | |
4062 | * can be avoided if the MAC was known apriori. | |
4063 | */ | |
4064 | #define OSPF_PING_NBR_STR_MAX (8 + 40 + 20) | |
ac4d0be5 | 4065 | void ospf_proactively_arp(struct ospf_neighbor *nbr) |
4066 | { | |
4067 | char ping_nbr[OSPF_PING_NBR_STR_MAX]; | |
4068 | char *str_ptr; | |
4069 | int ret; | |
4070 | ||
4071 | if (!nbr || !nbr->oi || !nbr->oi->ifp) | |
4072 | return; | |
4073 | ||
4074 | str_ptr = strcpy(ping_nbr, "ping -c 1 -I "); | |
4075 | str_ptr = strcat(str_ptr, nbr->oi->ifp->name); | |
4076 | str_ptr = strcat(str_ptr, " "); | |
4077 | str_ptr = strcat(str_ptr, inet_ntoa(nbr->address.u.prefix4)); | |
4078 | str_ptr = strcat(str_ptr, " > /dev/null 2>&1 &"); | |
4079 | ret = system(ping_nbr); | |
4080 | if (IS_DEBUG_OSPF_EVENT) | |
4081 | zlog_debug("Executed %s %s", ping_nbr, | |
4082 | ((ret == 0) ? "successfully" : "but failed")); | |
8b6912c2 | 4083 | } |