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718e3744 | 1 | /* |
2 | * OSPF Link State Advertisement | |
3 | * Copyright (C) 1999, 2000 Toshiaki Takada | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
896014f4 DL |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
718e3744 | 20 | */ |
21 | ||
22 | #include <zebra.h> | |
23 | ||
cbf3e3eb | 24 | #include "monotime.h" |
718e3744 | 25 | #include "linklist.h" |
26 | #include "prefix.h" | |
27 | #include "if.h" | |
28 | #include "table.h" | |
29 | #include "memory.h" | |
30 | #include "stream.h" | |
31 | #include "log.h" | |
32 | #include "thread.h" | |
33 | #include "hash.h" | |
d62a17ae | 34 | #include "sockunion.h" /* for inet_aton() */ |
6a270cd9 | 35 | #include "checksum.h" |
5920b3eb | 36 | #include "network.h" |
718e3744 | 37 | |
38 | #include "ospfd/ospfd.h" | |
39 | #include "ospfd/ospf_interface.h" | |
40 | #include "ospfd/ospf_ism.h" | |
41 | #include "ospfd/ospf_asbr.h" | |
42 | #include "ospfd/ospf_lsa.h" | |
43 | #include "ospfd/ospf_lsdb.h" | |
44 | #include "ospfd/ospf_neighbor.h" | |
45 | #include "ospfd/ospf_nsm.h" | |
46 | #include "ospfd/ospf_flood.h" | |
47 | #include "ospfd/ospf_packet.h" | |
48 | #include "ospfd/ospf_spf.h" | |
49 | #include "ospfd/ospf_dump.h" | |
50 | #include "ospfd/ospf_route.h" | |
51 | #include "ospfd/ospf_ase.h" | |
52 | #include "ospfd/ospf_zebra.h" | |
493472ba | 53 | #include "ospfd/ospf_abr.h" |
542a208f | 54 | #include "ospfd/ospf_errors.h" |
6b0655a2 | 55 | |
d7c0a89a | 56 | uint32_t get_metric(uint8_t *metric) |
718e3744 | 57 | { |
d7c0a89a | 58 | uint32_t m; |
d62a17ae | 59 | m = metric[0]; |
60 | m = (m << 8) + metric[1]; | |
61 | m = (m << 8) + metric[2]; | |
62 | return m; | |
718e3744 | 63 | } |
64 | ||
6b0655a2 | 65 | |
d62a17ae | 66 | struct timeval int2tv(int a) |
b6927875 | 67 | { |
d62a17ae | 68 | struct timeval ret; |
b6927875 | 69 | |
d62a17ae | 70 | ret.tv_sec = a; |
71 | ret.tv_usec = 0; | |
b6927875 | 72 | |
d62a17ae | 73 | return ret; |
b6927875 DS |
74 | } |
75 | ||
d62a17ae | 76 | struct timeval msec2tv(int a) |
718e3744 | 77 | { |
d62a17ae | 78 | struct timeval ret; |
718e3744 | 79 | |
d62a17ae | 80 | ret.tv_sec = a / 1000; |
81 | ret.tv_usec = (a % 1000) * 1000; | |
718e3744 | 82 | |
d62a17ae | 83 | return ret; |
718e3744 | 84 | } |
85 | ||
d62a17ae | 86 | int ospf_lsa_refresh_delay(struct ospf_lsa *lsa) |
718e3744 | 87 | { |
d62a17ae | 88 | struct timeval delta; |
89 | int delay = 0; | |
718e3744 | 90 | |
d62a17ae | 91 | if (monotime_since(&lsa->tv_orig, &delta) |
92 | < OSPF_MIN_LS_INTERVAL * 1000LL) { | |
93 | struct timeval minv = msec2tv(OSPF_MIN_LS_INTERVAL); | |
94 | timersub(&minv, &delta, &minv); | |
cbf3e3eb | 95 | |
d62a17ae | 96 | /* TBD: remove padding to full sec, return timeval instead */ |
97 | delay = minv.tv_sec + !!minv.tv_usec; | |
718e3744 | 98 | |
d62a17ae | 99 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) |
100 | zlog_debug( | |
101 | "LSA[Type%d:%s]: Refresh timer delay %d seconds", | |
102 | lsa->data->type, inet_ntoa(lsa->data->id), | |
103 | delay); | |
718e3744 | 104 | |
d62a17ae | 105 | assert(delay > 0); |
106 | } | |
718e3744 | 107 | |
d62a17ae | 108 | return delay; |
718e3744 | 109 | } |
110 | ||
6b0655a2 | 111 | |
d62a17ae | 112 | int get_age(struct ospf_lsa *lsa) |
718e3744 | 113 | { |
d62a17ae | 114 | struct timeval rel; |
718e3744 | 115 | |
d62a17ae | 116 | monotime_since(&lsa->tv_recv, &rel); |
117 | return ntohs(lsa->data->ls_age) + rel.tv_sec; | |
718e3744 | 118 | } |
119 | ||
6b0655a2 | 120 | |
718e3744 | 121 | /* Fletcher Checksum -- Refer to RFC1008. */ |
718e3744 | 122 | |
d62a17ae | 123 | /* All the offsets are zero-based. The offsets in the RFC1008 are |
6a270cd9 | 124 | one-based. */ |
d7c0a89a | 125 | uint16_t ospf_lsa_checksum(struct lsa_header *lsa) |
718e3744 | 126 | { |
c4efd0f4 | 127 | uint8_t *buffer = &lsa->options; |
d7c0a89a | 128 | int options_offset = buffer - (uint8_t *)&lsa->ls_age; /* should be 2 */ |
718e3744 | 129 | |
d62a17ae | 130 | /* Skip the AGE field */ |
d7c0a89a | 131 | uint16_t len = ntohs(lsa->length) - options_offset; |
718e3744 | 132 | |
d62a17ae | 133 | /* Checksum offset starts from "options" field, not the beginning of the |
134 | lsa_header struct. The offset is 14, rather than 16. */ | |
d7c0a89a | 135 | int checksum_offset = (uint8_t *)&lsa->checksum - buffer; |
718e3744 | 136 | |
d62a17ae | 137 | return fletcher_checksum(buffer, len, checksum_offset); |
718e3744 | 138 | } |
139 | ||
d62a17ae | 140 | int ospf_lsa_checksum_valid(struct lsa_header *lsa) |
d8a4e42b | 141 | { |
c4efd0f4 | 142 | uint8_t *buffer = &lsa->options; |
d7c0a89a | 143 | int options_offset = buffer - (uint8_t *)&lsa->ls_age; /* should be 2 */ |
d8a4e42b | 144 | |
d62a17ae | 145 | /* Skip the AGE field */ |
d7c0a89a | 146 | uint16_t len = ntohs(lsa->length) - options_offset; |
d8a4e42b | 147 | |
d62a17ae | 148 | return (fletcher_checksum(buffer, len, FLETCHER_CHECKSUM_VALIDATE) |
149 | == 0); | |
d8a4e42b JR |
150 | } |
151 | ||
718e3744 | 152 | |
718e3744 | 153 | /* Create OSPF LSA. */ |
4d762f26 | 154 | struct ospf_lsa *ospf_lsa_new(void) |
718e3744 | 155 | { |
d62a17ae | 156 | struct ospf_lsa *new; |
718e3744 | 157 | |
d62a17ae | 158 | new = XCALLOC(MTYPE_OSPF_LSA, sizeof(struct ospf_lsa)); |
718e3744 | 159 | |
d62a17ae | 160 | new->flags = 0; |
161 | new->lock = 1; | |
162 | new->retransmit_counter = 0; | |
163 | monotime(&new->tv_recv); | |
164 | new->tv_orig = new->tv_recv; | |
165 | new->refresh_list = -1; | |
b5a8894d | 166 | new->vrf_id = VRF_DEFAULT; |
d62a17ae | 167 | |
168 | return new; | |
718e3744 | 169 | } |
170 | ||
5b3d4186 DS |
171 | struct ospf_lsa *ospf_lsa_new_and_data(size_t size) |
172 | { | |
173 | struct ospf_lsa *new; | |
174 | ||
175 | new = ospf_lsa_new(); | |
176 | new->data = ospf_lsa_data_new(size); | |
177 | ||
178 | return new; | |
179 | } | |
180 | ||
718e3744 | 181 | /* Duplicate OSPF LSA. */ |
d62a17ae | 182 | struct ospf_lsa *ospf_lsa_dup(struct ospf_lsa *lsa) |
718e3744 | 183 | { |
d62a17ae | 184 | struct ospf_lsa *new; |
718e3744 | 185 | |
d62a17ae | 186 | if (lsa == NULL) |
187 | return NULL; | |
718e3744 | 188 | |
d62a17ae | 189 | new = XCALLOC(MTYPE_OSPF_LSA, sizeof(struct ospf_lsa)); |
718e3744 | 190 | |
d62a17ae | 191 | memcpy(new, lsa, sizeof(struct ospf_lsa)); |
192 | UNSET_FLAG(new->flags, OSPF_LSA_DISCARD); | |
193 | new->lock = 1; | |
194 | new->retransmit_counter = 0; | |
195 | new->data = ospf_lsa_data_dup(lsa->data); | |
718e3744 | 196 | |
d62a17ae | 197 | /* kevinm: Clear the refresh_list, otherwise there are going |
198 | to be problems when we try to remove the LSA from the | |
199 | queue (which it's not a member of.) | |
200 | XXX: Should we add the LSA to the refresh_list queue? */ | |
201 | new->refresh_list = -1; | |
f2c80652 | 202 | |
d62a17ae | 203 | if (IS_DEBUG_OSPF(lsa, LSA)) |
204 | zlog_debug("LSA: duplicated %p (new: %p)", (void *)lsa, | |
205 | (void *)new); | |
f2c80652 | 206 | |
d62a17ae | 207 | return new; |
718e3744 | 208 | } |
209 | ||
210 | /* Free OSPF LSA. */ | |
d62a17ae | 211 | void ospf_lsa_free(struct ospf_lsa *lsa) |
718e3744 | 212 | { |
d62a17ae | 213 | assert(lsa->lock == 0); |
214 | ||
215 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
216 | zlog_debug("LSA: freed %p", (void *)lsa); | |
718e3744 | 217 | |
d62a17ae | 218 | /* Delete LSA data. */ |
219 | if (lsa->data != NULL) | |
220 | ospf_lsa_data_free(lsa->data); | |
718e3744 | 221 | |
d62a17ae | 222 | assert(lsa->refresh_list < 0); |
718e3744 | 223 | |
d62a17ae | 224 | memset(lsa, 0, sizeof(struct ospf_lsa)); |
225 | XFREE(MTYPE_OSPF_LSA, lsa); | |
718e3744 | 226 | } |
227 | ||
228 | /* Lock LSA. */ | |
d62a17ae | 229 | struct ospf_lsa *ospf_lsa_lock(struct ospf_lsa *lsa) |
718e3744 | 230 | { |
d62a17ae | 231 | lsa->lock++; |
232 | return lsa; | |
718e3744 | 233 | } |
234 | ||
235 | /* Unlock LSA. */ | |
d62a17ae | 236 | void ospf_lsa_unlock(struct ospf_lsa **lsa) |
718e3744 | 237 | { |
d62a17ae | 238 | /* This is sanity check. */ |
239 | if (!lsa || !*lsa) | |
240 | return; | |
718e3744 | 241 | |
d62a17ae | 242 | (*lsa)->lock--; |
718e3744 | 243 | |
d62a17ae | 244 | assert((*lsa)->lock >= 0); |
245 | ||
246 | if ((*lsa)->lock == 0) { | |
247 | assert(CHECK_FLAG((*lsa)->flags, OSPF_LSA_DISCARD)); | |
248 | ospf_lsa_free(*lsa); | |
249 | *lsa = NULL; | |
250 | } | |
718e3744 | 251 | } |
252 | ||
253 | /* Check discard flag. */ | |
d62a17ae | 254 | void ospf_lsa_discard(struct ospf_lsa *lsa) |
718e3744 | 255 | { |
d62a17ae | 256 | if (!CHECK_FLAG(lsa->flags, OSPF_LSA_DISCARD)) { |
257 | SET_FLAG(lsa->flags, OSPF_LSA_DISCARD); | |
258 | ospf_lsa_unlock(&lsa); | |
259 | } | |
718e3744 | 260 | } |
261 | ||
262 | /* Create LSA data. */ | |
d62a17ae | 263 | struct lsa_header *ospf_lsa_data_new(size_t size) |
718e3744 | 264 | { |
d62a17ae | 265 | return XCALLOC(MTYPE_OSPF_LSA_DATA, size); |
718e3744 | 266 | } |
267 | ||
268 | /* Duplicate LSA data. */ | |
d62a17ae | 269 | struct lsa_header *ospf_lsa_data_dup(struct lsa_header *lsah) |
718e3744 | 270 | { |
d62a17ae | 271 | struct lsa_header *new; |
718e3744 | 272 | |
d62a17ae | 273 | new = ospf_lsa_data_new(ntohs(lsah->length)); |
274 | memcpy(new, lsah, ntohs(lsah->length)); | |
718e3744 | 275 | |
d62a17ae | 276 | return new; |
718e3744 | 277 | } |
278 | ||
279 | /* Free LSA data. */ | |
d62a17ae | 280 | void ospf_lsa_data_free(struct lsa_header *lsah) |
718e3744 | 281 | { |
d62a17ae | 282 | if (IS_DEBUG_OSPF(lsa, LSA)) |
283 | zlog_debug("LSA[Type%d:%s]: data freed %p", lsah->type, | |
284 | inet_ntoa(lsah->id), (void *)lsah); | |
718e3744 | 285 | |
d62a17ae | 286 | XFREE(MTYPE_OSPF_LSA_DATA, lsah); |
718e3744 | 287 | } |
288 | ||
6b0655a2 | 289 | |
718e3744 | 290 | /* LSA general functions. */ |
291 | ||
d62a17ae | 292 | const char *dump_lsa_key(struct ospf_lsa *lsa) |
718e3744 | 293 | { |
2b64873d | 294 | static char buf[sizeof("Type255,id(255.255.255.255),ar(255.255.255.255)")+1]; |
d62a17ae | 295 | struct lsa_header *lsah; |
718e3744 | 296 | |
d62a17ae | 297 | if (lsa != NULL && (lsah = lsa->data) != NULL) { |
298 | char id[INET_ADDRSTRLEN], ar[INET_ADDRSTRLEN]; | |
a1d6bbb1 RW |
299 | strlcpy(id, inet_ntoa(lsah->id), sizeof(id)); |
300 | strlcpy(ar, inet_ntoa(lsah->adv_router), sizeof(ar)); | |
718e3744 | 301 | |
772270f3 QY |
302 | snprintf(buf, sizeof(buf), "Type%d,id(%s),ar(%s)", lsah->type, |
303 | id, ar); | |
d62a17ae | 304 | } else |
a1d6bbb1 | 305 | strlcpy(buf, "NULL", sizeof(buf)); |
718e3744 | 306 | |
d62a17ae | 307 | return buf; |
718e3744 | 308 | } |
309 | ||
d7c0a89a | 310 | uint32_t lsa_seqnum_increment(struct ospf_lsa *lsa) |
718e3744 | 311 | { |
d7c0a89a | 312 | uint32_t seqnum; |
718e3744 | 313 | |
d62a17ae | 314 | seqnum = ntohl(lsa->data->ls_seqnum) + 1; |
718e3744 | 315 | |
d62a17ae | 316 | return htonl(seqnum); |
718e3744 | 317 | } |
318 | ||
d7c0a89a | 319 | void lsa_header_set(struct stream *s, uint8_t options, uint8_t type, |
d62a17ae | 320 | struct in_addr id, struct in_addr router_id) |
718e3744 | 321 | { |
d62a17ae | 322 | struct lsa_header *lsah; |
718e3744 | 323 | |
d62a17ae | 324 | lsah = (struct lsa_header *)STREAM_DATA(s); |
718e3744 | 325 | |
d62a17ae | 326 | lsah->ls_age = htons(OSPF_LSA_INITIAL_AGE); |
327 | lsah->options = options; | |
328 | lsah->type = type; | |
329 | lsah->id = id; | |
330 | lsah->adv_router = router_id; | |
331 | lsah->ls_seqnum = htonl(OSPF_INITIAL_SEQUENCE_NUMBER); | |
718e3744 | 332 | |
d62a17ae | 333 | stream_forward_endp(s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 334 | } |
6b0655a2 | 335 | |
68980084 | 336 | |
718e3744 | 337 | /* router-LSA related functions. */ |
338 | /* Get router-LSA flags. */ | |
d7c0a89a | 339 | static uint8_t router_lsa_flags(struct ospf_area *area) |
d62a17ae | 340 | { |
d7c0a89a | 341 | uint8_t flags; |
d62a17ae | 342 | |
343 | flags = area->ospf->flags; | |
344 | ||
345 | /* Set virtual link flag. */ | |
346 | if (ospf_full_virtual_nbrs(area)) | |
347 | SET_FLAG(flags, ROUTER_LSA_VIRTUAL); | |
348 | else | |
349 | /* Just sanity check */ | |
350 | UNSET_FLAG(flags, ROUTER_LSA_VIRTUAL); | |
351 | ||
352 | /* Set Shortcut ABR behabiour flag. */ | |
353 | UNSET_FLAG(flags, ROUTER_LSA_SHORTCUT); | |
354 | if (area->ospf->abr_type == OSPF_ABR_SHORTCUT) | |
355 | if (!OSPF_IS_AREA_BACKBONE(area)) | |
356 | if ((area->shortcut_configured == OSPF_SHORTCUT_DEFAULT | |
357 | && area->ospf->backbone == NULL) | |
358 | || area->shortcut_configured | |
359 | == OSPF_SHORTCUT_ENABLE) | |
360 | SET_FLAG(flags, ROUTER_LSA_SHORTCUT); | |
361 | ||
362 | /* ASBR can't exit in stub area. */ | |
363 | if (area->external_routing == OSPF_AREA_STUB) | |
364 | UNSET_FLAG(flags, ROUTER_LSA_EXTERNAL); | |
365 | /* If ASBR set External flag */ | |
366 | else if (IS_OSPF_ASBR(area->ospf)) | |
367 | SET_FLAG(flags, ROUTER_LSA_EXTERNAL); | |
368 | ||
369 | /* Set ABR dependent flags */ | |
370 | if (IS_OSPF_ABR(area->ospf)) { | |
371 | SET_FLAG(flags, ROUTER_LSA_BORDER); | |
372 | /* If Area is NSSA and we are both ABR and unconditional | |
373 | * translator, | |
374 | * set Nt bit to inform other routers. | |
375 | */ | |
376 | if ((area->external_routing == OSPF_AREA_NSSA) | |
377 | && (area->NSSATranslatorRole == OSPF_NSSA_ROLE_ALWAYS)) | |
378 | SET_FLAG(flags, ROUTER_LSA_NT); | |
379 | } | |
380 | return flags; | |
718e3744 | 381 | } |
382 | ||
383 | /* Lookup neighbor other than myself. | |
384 | And check neighbor count, | |
385 | Point-to-Point link must have only 1 neighbor. */ | |
d62a17ae | 386 | struct ospf_neighbor *ospf_nbr_lookup_ptop(struct ospf_interface *oi) |
718e3744 | 387 | { |
d62a17ae | 388 | struct ospf_neighbor *nbr = NULL; |
389 | struct route_node *rn; | |
718e3744 | 390 | |
d62a17ae | 391 | /* Search neighbor, there must be one of two nbrs. */ |
392 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
393 | if ((nbr = rn->info)) | |
394 | if (!IPV4_ADDR_SAME(&nbr->router_id, | |
395 | &oi->ospf->router_id)) | |
396 | if (nbr->state == NSM_Full) { | |
397 | route_unlock_node(rn); | |
398 | break; | |
399 | } | |
718e3744 | 400 | |
d62a17ae | 401 | /* PtoP link must have only 1 neighbor. */ |
402 | if (ospf_nbr_count(oi, 0) > 1) | |
cf444bcf | 403 | flog_warn(EC_OSPF_PTP_NEIGHBOR, |
13ab4921 | 404 | "Point-to-Point link has more than 1 neighobrs."); |
718e3744 | 405 | |
d62a17ae | 406 | return nbr; |
718e3744 | 407 | } |
408 | ||
88d6cf37 | 409 | /* Determine cost of link, taking RFC3137 stub-router support into |
410 | * consideration | |
411 | */ | |
d7c0a89a | 412 | static uint16_t ospf_link_cost(struct ospf_interface *oi) |
88d6cf37 | 413 | { |
d62a17ae | 414 | /* RFC3137 stub router support */ |
415 | if (!CHECK_FLAG(oi->area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED)) | |
416 | return oi->output_cost; | |
417 | else | |
418 | return OSPF_OUTPUT_COST_INFINITE; | |
88d6cf37 | 419 | } |
420 | ||
718e3744 | 421 | /* Set a link information. */ |
db3c830a | 422 | static char link_info_set(struct stream **s, struct in_addr id, |
d7c0a89a QY |
423 | struct in_addr data, uint8_t type, uint8_t tos, |
424 | uint16_t cost) | |
d62a17ae | 425 | { |
426 | /* LSA stream is initially allocated to OSPF_MAX_LSA_SIZE, suits | |
427 | * vast majority of cases. Some rare routers with lots of links need | |
428 | * more. | |
429 | * we try accomodate those here. | |
430 | */ | |
db3c830a | 431 | if (STREAM_WRITEABLE(*s) < OSPF_ROUTER_LSA_LINK_SIZE) { |
d62a17ae | 432 | size_t ret = OSPF_MAX_LSA_SIZE; |
433 | ||
434 | /* Can we enlarge the stream still? */ | |
db3c830a | 435 | if (STREAM_SIZE(*s) == OSPF_MAX_LSA_SIZE) { |
d62a17ae | 436 | /* we futz the size here for simplicity, really we need |
437 | * to account | |
438 | * for just: | |
0d6f7fd6 | 439 | * IP Header - (sizeof(struct ip)) |
d62a17ae | 440 | * OSPF Header - OSPF_HEADER_SIZE |
441 | * LSA Header - OSPF_LSA_HEADER_SIZE | |
442 | * MD5 auth data, if MD5 is configured - | |
443 | * OSPF_AUTH_MD5_SIZE. | |
444 | * | |
445 | * Simpler just to subtract OSPF_MAX_LSA_SIZE though. | |
446 | */ | |
db3c830a | 447 | ret = stream_resize_inplace( |
9d303b37 | 448 | s, OSPF_MAX_PACKET_SIZE - OSPF_MAX_LSA_SIZE); |
d62a17ae | 449 | } |
450 | ||
451 | if (ret == OSPF_MAX_LSA_SIZE) { | |
13ab4921 | 452 | flog_warn( |
cf444bcf | 453 | EC_OSPF_LSA_SIZE, |
d62a17ae | 454 | "%s: Out of space in LSA stream, left %zd, size %zd", |
db3c830a DS |
455 | __func__, STREAM_WRITEABLE(*s), |
456 | STREAM_SIZE(*s)); | |
d62a17ae | 457 | return 0; |
458 | } | |
459 | } | |
460 | ||
461 | /* TOS based routing is not supported. */ | |
db3c830a DS |
462 | stream_put_ipv4(*s, id.s_addr); /* Link ID. */ |
463 | stream_put_ipv4(*s, data.s_addr); /* Link Data. */ | |
464 | stream_putc(*s, type); /* Link Type. */ | |
465 | stream_putc(*s, tos); /* TOS = 0. */ | |
466 | stream_putw(*s, cost); /* Link Cost. */ | |
d62a17ae | 467 | |
468 | return 1; | |
718e3744 | 469 | } |
470 | ||
e4529636 | 471 | /* Describe Point-to-Point link (Section 12.4.1.1). */ |
db3c830a | 472 | static int lsa_link_ptop_set(struct stream **s, struct ospf_interface *oi) |
d62a17ae | 473 | { |
474 | int links = 0; | |
475 | struct ospf_neighbor *nbr; | |
476 | struct in_addr id, mask, data; | |
d7c0a89a | 477 | uint16_t cost = ospf_link_cost(oi); |
d62a17ae | 478 | |
479 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
480 | zlog_debug("LSA[Type1]: Set link Point-to-Point"); | |
481 | ||
482 | if ((nbr = ospf_nbr_lookup_ptop(oi))) | |
483 | if (nbr->state == NSM_Full) { | |
484 | if (CHECK_FLAG(oi->connected->flags, | |
485 | ZEBRA_IFA_UNNUMBERED)) { | |
486 | /* For unnumbered point-to-point networks, the | |
487 | Link Data field | |
488 | should specify the interface's MIB-II ifIndex | |
489 | value. */ | |
490 | data.s_addr = htonl(oi->ifp->ifindex); | |
491 | links += link_info_set( | |
492 | s, nbr->router_id, data, | |
493 | LSA_LINK_TYPE_POINTOPOINT, 0, cost); | |
494 | } else { | |
495 | links += link_info_set( | |
496 | s, nbr->router_id, | |
497 | oi->address->u.prefix4, | |
498 | LSA_LINK_TYPE_POINTOPOINT, 0, cost); | |
499 | } | |
500 | } | |
501 | ||
502 | /* no need for a stub link for unnumbered interfaces */ | |
503 | if (!CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED)) { | |
504 | /* Regardless of the state of the neighboring router, we must | |
505 | add a Type 3 link (stub network). | |
506 | N.B. Options 1 & 2 share basically the same logic. */ | |
507 | masklen2ip(oi->address->prefixlen, &mask); | |
508 | id.s_addr = CONNECTED_PREFIX(oi->connected)->u.prefix4.s_addr | |
509 | & mask.s_addr; | |
510 | links += link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, | |
511 | oi->output_cost); | |
512 | } | |
513 | ||
514 | return links; | |
718e3744 | 515 | } |
516 | ||
517 | /* Describe Broadcast Link. */ | |
db3c830a | 518 | static int lsa_link_broadcast_set(struct stream **s, struct ospf_interface *oi) |
d62a17ae | 519 | { |
520 | struct ospf_neighbor *dr; | |
521 | struct in_addr id, mask; | |
d7c0a89a | 522 | uint16_t cost = ospf_link_cost(oi); |
d62a17ae | 523 | |
524 | /* Describe Type 3 Link. */ | |
525 | if (oi->state == ISM_Waiting) { | |
526 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
527 | zlog_debug( | |
3efd0893 | 528 | "LSA[Type1]: Interface %s is in state Waiting. Adding stub interface", |
d62a17ae | 529 | oi->ifp->name); |
530 | masklen2ip(oi->address->prefixlen, &mask); | |
531 | id.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
532 | return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, | |
533 | oi->output_cost); | |
534 | } | |
535 | ||
536 | dr = ospf_nbr_lookup_by_addr(oi->nbrs, &DR(oi)); | |
537 | /* Describe Type 2 link. */ | |
9d303b37 DL |
538 | if (dr && (dr->state == NSM_Full |
539 | || IPV4_ADDR_SAME(&oi->address->u.prefix4, &DR(oi))) | |
d62a17ae | 540 | && ospf_nbr_count(oi, NSM_Full) > 0) { |
541 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
542 | zlog_debug( | |
3efd0893 | 543 | "LSA[Type1]: Interface %s has a DR. Adding transit interface", |
d62a17ae | 544 | oi->ifp->name); |
545 | return link_info_set(s, DR(oi), oi->address->u.prefix4, | |
546 | LSA_LINK_TYPE_TRANSIT, 0, cost); | |
547 | } | |
548 | /* Describe type 3 link. */ | |
549 | else { | |
550 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
551 | zlog_debug( | |
3efd0893 | 552 | "LSA[Type1]: Interface %s has no DR. Adding stub interface", |
d62a17ae | 553 | oi->ifp->name); |
554 | masklen2ip(oi->address->prefixlen, &mask); | |
555 | id.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
556 | return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, | |
557 | oi->output_cost); | |
558 | } | |
559 | } | |
560 | ||
db3c830a | 561 | static int lsa_link_loopback_set(struct stream **s, struct ospf_interface *oi) |
d62a17ae | 562 | { |
563 | struct in_addr id, mask; | |
564 | ||
565 | /* Describe Type 3 Link. */ | |
566 | if (oi->state != ISM_Loopback) | |
567 | return 0; | |
568 | ||
569 | mask.s_addr = 0xffffffff; | |
570 | id.s_addr = oi->address->u.prefix4.s_addr; | |
571 | return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, 0); | |
718e3744 | 572 | } |
573 | ||
574 | /* Describe Virtual Link. */ | |
db3c830a DS |
575 | static int lsa_link_virtuallink_set(struct stream **s, |
576 | struct ospf_interface *oi) | |
718e3744 | 577 | { |
d62a17ae | 578 | struct ospf_neighbor *nbr; |
d7c0a89a | 579 | uint16_t cost = ospf_link_cost(oi); |
718e3744 | 580 | |
d62a17ae | 581 | if (oi->state == ISM_PointToPoint) |
582 | if ((nbr = ospf_nbr_lookup_ptop(oi))) | |
583 | if (nbr->state == NSM_Full) { | |
584 | return link_info_set(s, nbr->router_id, | |
585 | oi->address->u.prefix4, | |
586 | LSA_LINK_TYPE_VIRTUALLINK, | |
587 | 0, cost); | |
588 | } | |
718e3744 | 589 | |
d62a17ae | 590 | return 0; |
718e3744 | 591 | } |
592 | ||
593 | #define lsa_link_nbma_set(S,O) lsa_link_broadcast_set (S, O) | |
594 | ||
d62a17ae | 595 | /* this function add for support point-to-multipoint ,see rfc2328 |
7afa08da | 596 | 12.4.1.4.*/ |
597 | /* from "edward rrr" <edward_rrr@hotmail.com> | |
598 | http://marc.theaimsgroup.com/?l=zebra&m=100739222210507&w=2 */ | |
db3c830a | 599 | static int lsa_link_ptomp_set(struct stream **s, struct ospf_interface *oi) |
d62a17ae | 600 | { |
601 | int links = 0; | |
602 | struct route_node *rn; | |
603 | struct ospf_neighbor *nbr = NULL; | |
604 | struct in_addr id, mask; | |
d7c0a89a | 605 | uint16_t cost = ospf_link_cost(oi); |
d62a17ae | 606 | |
607 | mask.s_addr = 0xffffffff; | |
608 | id.s_addr = oi->address->u.prefix4.s_addr; | |
609 | links += link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, 0); | |
610 | ||
611 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
612 | zlog_debug("PointToMultipoint: running ptomultip_set"); | |
613 | ||
614 | /* Search neighbor, */ | |
615 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
616 | if ((nbr = rn->info) != NULL) | |
617 | /* Ignore myself. */ | |
618 | if (!IPV4_ADDR_SAME(&nbr->router_id, | |
619 | &oi->ospf->router_id)) | |
620 | if (nbr->state == NSM_Full) | |
621 | ||
622 | { | |
623 | links += link_info_set( | |
624 | s, nbr->router_id, | |
625 | oi->address->u.prefix4, | |
626 | LSA_LINK_TYPE_POINTOPOINT, 0, | |
627 | cost); | |
628 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
629 | zlog_debug( | |
630 | "PointToMultipoint: set link to %s", | |
631 | inet_ntoa( | |
632 | oi->address->u | |
633 | .prefix4)); | |
634 | } | |
635 | ||
636 | return links; | |
7afa08da | 637 | } |
638 | ||
718e3744 | 639 | /* Set router-LSA link information. */ |
db3c830a | 640 | static int router_lsa_link_set(struct stream **s, struct ospf_area *area) |
d62a17ae | 641 | { |
642 | struct listnode *node; | |
643 | struct ospf_interface *oi; | |
644 | int links = 0; | |
645 | ||
646 | for (ALL_LIST_ELEMENTS_RO(area->oiflist, node, oi)) { | |
647 | struct interface *ifp = oi->ifp; | |
648 | ||
649 | /* Check interface is up, OSPF is enable. */ | |
650 | if (if_is_operative(ifp)) { | |
651 | if (oi->state != ISM_Down) { | |
652 | oi->lsa_pos_beg = links; | |
653 | /* Describe each link. */ | |
654 | switch (oi->type) { | |
655 | case OSPF_IFTYPE_POINTOPOINT: | |
656 | links += lsa_link_ptop_set(s, oi); | |
657 | break; | |
658 | case OSPF_IFTYPE_BROADCAST: | |
659 | links += lsa_link_broadcast_set(s, oi); | |
660 | break; | |
661 | case OSPF_IFTYPE_NBMA: | |
662 | links += lsa_link_nbma_set(s, oi); | |
663 | break; | |
664 | case OSPF_IFTYPE_POINTOMULTIPOINT: | |
665 | links += lsa_link_ptomp_set(s, oi); | |
666 | break; | |
667 | case OSPF_IFTYPE_VIRTUALLINK: | |
668 | links += | |
669 | lsa_link_virtuallink_set(s, oi); | |
670 | break; | |
671 | case OSPF_IFTYPE_LOOPBACK: | |
672 | links += lsa_link_loopback_set(s, oi); | |
673 | } | |
674 | oi->lsa_pos_end = links; | |
675 | } | |
718e3744 | 676 | } |
718e3744 | 677 | } |
718e3744 | 678 | |
d62a17ae | 679 | return links; |
718e3744 | 680 | } |
681 | ||
682 | /* Set router-LSA body. */ | |
db3c830a | 683 | static void ospf_router_lsa_body_set(struct stream **s, struct ospf_area *area) |
d62a17ae | 684 | { |
685 | unsigned long putp; | |
d7c0a89a | 686 | uint16_t cnt; |
d62a17ae | 687 | |
688 | /* Set flags. */ | |
db3c830a | 689 | stream_putc(*s, router_lsa_flags(area)); |
d62a17ae | 690 | |
691 | /* Set Zero fields. */ | |
db3c830a | 692 | stream_putc(*s, 0); |
d62a17ae | 693 | |
694 | /* Keep pointer to # links. */ | |
db3c830a | 695 | putp = stream_get_endp(*s); |
d62a17ae | 696 | |
697 | /* Forward word */ | |
db3c830a | 698 | stream_putw(*s, 0); |
d62a17ae | 699 | |
700 | /* Set all link information. */ | |
701 | cnt = router_lsa_link_set(s, area); | |
702 | ||
703 | /* Set # of links here. */ | |
db3c830a | 704 | stream_putw_at(*s, putp, cnt); |
d62a17ae | 705 | } |
706 | ||
707 | static int ospf_stub_router_timer(struct thread *t) | |
708 | { | |
709 | struct ospf_area *area = THREAD_ARG(t); | |
710 | ||
711 | area->t_stub_router = NULL; | |
712 | ||
713 | SET_FLAG(area->stub_router_state, OSPF_AREA_WAS_START_STUB_ROUTED); | |
714 | ||
715 | /* clear stub route state and generate router-lsa refresh, don't | |
716 | * clobber an administratively set stub-router state though. | |
717 | */ | |
718 | if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_ADMIN_STUB_ROUTED)) | |
719 | return 0; | |
720 | ||
721 | UNSET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED); | |
722 | ||
723 | ospf_router_lsa_update_area(area); | |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
728 | static void ospf_stub_router_check(struct ospf_area *area) | |
729 | { | |
730 | /* area must either be administratively configured to be stub | |
731 | * or startup-time stub-router must be configured and we must in a | |
732 | * pre-stub | |
733 | * state. | |
734 | */ | |
735 | if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_ADMIN_STUB_ROUTED)) { | |
736 | SET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED); | |
737 | return; | |
738 | } | |
739 | ||
740 | /* not admin-stubbed, check whether startup stubbing is configured and | |
741 | * whether it's not been done yet | |
742 | */ | |
743 | if (CHECK_FLAG(area->stub_router_state, | |
744 | OSPF_AREA_WAS_START_STUB_ROUTED)) | |
745 | return; | |
746 | ||
747 | if (area->ospf->stub_router_startup_time | |
748 | == OSPF_STUB_ROUTER_UNCONFIGURED) { | |
749 | /* stub-router is hence done forever for this area, even if | |
750 | * someone | |
751 | * tries configure it (take effect next restart). | |
752 | */ | |
753 | SET_FLAG(area->stub_router_state, | |
754 | OSPF_AREA_WAS_START_STUB_ROUTED); | |
755 | return; | |
756 | } | |
757 | ||
758 | /* startup stub-router configured and not yet done */ | |
759 | SET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED); | |
760 | ||
761 | OSPF_AREA_TIMER_ON(area->t_stub_router, ospf_stub_router_timer, | |
762 | area->ospf->stub_router_startup_time); | |
763 | } | |
764 | ||
718e3744 | 765 | /* Create new router-LSA. */ |
d62a17ae | 766 | static struct ospf_lsa *ospf_router_lsa_new(struct ospf_area *area) |
767 | { | |
768 | struct ospf *ospf = area->ospf; | |
769 | struct stream *s; | |
770 | struct lsa_header *lsah; | |
771 | struct ospf_lsa *new; | |
772 | int length; | |
773 | ||
774 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
775 | zlog_debug("LSA[Type1]: Create router-LSA instance"); | |
776 | ||
777 | /* check whether stub-router is desired, and if this is the first | |
778 | * router LSA. | |
779 | */ | |
780 | ospf_stub_router_check(area); | |
781 | ||
782 | /* Create a stream for LSA. */ | |
783 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
784 | /* Set LSA common header fields. */ | |
785 | lsa_header_set(s, LSA_OPTIONS_GET(area) | LSA_OPTIONS_NSSA_GET(area), | |
786 | OSPF_ROUTER_LSA, ospf->router_id, ospf->router_id); | |
787 | ||
788 | /* Set router-LSA body fields. */ | |
db3c830a | 789 | ospf_router_lsa_body_set(&s, area); |
d62a17ae | 790 | |
791 | /* Set length. */ | |
792 | length = stream_get_endp(s); | |
793 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
794 | lsah->length = htons(length); | |
795 | ||
796 | /* Now, create OSPF LSA instance. */ | |
5b3d4186 | 797 | new = ospf_lsa_new_and_data(length); |
d62a17ae | 798 | |
799 | new->area = area; | |
800 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
b5a8894d | 801 | new->vrf_id = area->ospf->vrf_id; |
d62a17ae | 802 | |
803 | /* Copy LSA data to store, discard stream. */ | |
d62a17ae | 804 | memcpy(new->data, lsah, length); |
805 | stream_free(s); | |
806 | ||
807 | return new; | |
718e3744 | 808 | } |
809 | ||
810 | /* Originate Router-LSA. */ | |
d62a17ae | 811 | static struct ospf_lsa *ospf_router_lsa_originate(struct ospf_area *area) |
718e3744 | 812 | { |
d62a17ae | 813 | struct ospf_lsa *new; |
718e3744 | 814 | |
d62a17ae | 815 | /* Create new router-LSA instance. */ |
816 | if ((new = ospf_router_lsa_new(area)) == NULL) { | |
817 | zlog_err("%s: ospf_router_lsa_new returned NULL", __func__); | |
818 | return NULL; | |
819 | } | |
820 | ||
821 | /* Sanity check. */ | |
975a328e | 822 | if (new->data->adv_router.s_addr == INADDR_ANY) { |
d62a17ae | 823 | if (IS_DEBUG_OSPF_EVENT) |
824 | zlog_debug("LSA[Type1]: AdvRouter is 0, discard"); | |
825 | ospf_lsa_discard(new); | |
826 | return NULL; | |
827 | } | |
718e3744 | 828 | |
d62a17ae | 829 | /* Install LSA to LSDB. */ |
830 | new = ospf_lsa_install(area->ospf, NULL, new); | |
718e3744 | 831 | |
d62a17ae | 832 | /* Update LSA origination count. */ |
833 | area->ospf->lsa_originate_count++; | |
718e3744 | 834 | |
d62a17ae | 835 | /* Flooding new LSA through area. */ |
836 | ospf_flood_through_area(area, NULL, new); | |
718e3744 | 837 | |
d62a17ae | 838 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { |
839 | zlog_debug("LSA[Type%d:%s]: Originate router-LSA %p", | |
840 | new->data->type, inet_ntoa(new->data->id), | |
841 | (void *)new); | |
842 | ospf_lsa_header_dump(new->data); | |
843 | } | |
718e3744 | 844 | |
d62a17ae | 845 | return new; |
718e3744 | 846 | } |
847 | ||
848 | /* Refresh router-LSA. */ | |
d62a17ae | 849 | static struct ospf_lsa *ospf_router_lsa_refresh(struct ospf_lsa *lsa) |
850 | { | |
851 | struct ospf_area *area = lsa->area; | |
852 | struct ospf_lsa *new; | |
853 | ||
854 | /* Sanity check. */ | |
855 | assert(lsa->data); | |
718e3744 | 856 | |
d62a17ae | 857 | /* Delete LSA from neighbor retransmit-list. */ |
858 | ospf_ls_retransmit_delete_nbr_area(area, lsa); | |
718e3744 | 859 | |
d62a17ae | 860 | /* Unregister LSA from refresh-list */ |
861 | ospf_refresher_unregister_lsa(area->ospf, lsa); | |
718e3744 | 862 | |
d62a17ae | 863 | /* Create new router-LSA instance. */ |
864 | if ((new = ospf_router_lsa_new(area)) == NULL) { | |
865 | zlog_err("%s: ospf_router_lsa_new returned NULL", __func__); | |
866 | return NULL; | |
867 | } | |
868 | ||
869 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
718e3744 | 870 | |
d62a17ae | 871 | ospf_lsa_install(area->ospf, NULL, new); |
718e3744 | 872 | |
d62a17ae | 873 | /* Flood LSA through area. */ |
874 | ospf_flood_through_area(area, NULL, new); | |
875 | ||
876 | /* Debug logging. */ | |
877 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
878 | zlog_debug("LSA[Type%d:%s]: router-LSA refresh", | |
879 | new->data->type, inet_ntoa(new->data->id)); | |
880 | ospf_lsa_header_dump(new->data); | |
881 | } | |
718e3744 | 882 | |
d62a17ae | 883 | return NULL; |
718e3744 | 884 | } |
885 | ||
d62a17ae | 886 | int ospf_router_lsa_update_area(struct ospf_area *area) |
718e3744 | 887 | { |
d62a17ae | 888 | if (IS_DEBUG_OSPF_EVENT) |
889 | zlog_debug("[router-LSA]: (router-LSA area update)"); | |
718e3744 | 890 | |
d62a17ae | 891 | /* Now refresh router-LSA. */ |
892 | if (area->router_lsa_self) | |
893 | ospf_lsa_refresh(area->ospf, area->router_lsa_self); | |
894 | /* Newly originate router-LSA. */ | |
895 | else | |
896 | ospf_router_lsa_originate(area); | |
718e3744 | 897 | |
d62a17ae | 898 | return 0; |
718e3744 | 899 | } |
900 | ||
d62a17ae | 901 | int ospf_router_lsa_update(struct ospf *ospf) |
718e3744 | 902 | { |
d62a17ae | 903 | struct listnode *node, *nnode; |
904 | struct ospf_area *area; | |
718e3744 | 905 | |
d62a17ae | 906 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) |
907 | zlog_debug("Timer[router-LSA Update]: (timer expire)"); | |
718e3744 | 908 | |
d62a17ae | 909 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { |
910 | struct ospf_lsa *lsa = area->router_lsa_self; | |
911 | struct router_lsa *rl; | |
912 | const char *area_str; | |
718e3744 | 913 | |
d62a17ae | 914 | /* Keep Area ID string. */ |
915 | area_str = AREA_NAME(area); | |
718e3744 | 916 | |
d62a17ae | 917 | /* If LSA not exist in this Area, originate new. */ |
918 | if (lsa == NULL) { | |
919 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
920 | zlog_debug( | |
921 | "LSA[Type1]: Create router-LSA for Area %s", | |
922 | area_str); | |
718e3744 | 923 | |
d62a17ae | 924 | ospf_router_lsa_originate(area); |
925 | } | |
926 | /* If router-ID is changed, Link ID must change. | |
927 | First flush old LSA, then originate new. */ | |
928 | else if (!IPV4_ADDR_SAME(&lsa->data->id, &ospf->router_id)) { | |
929 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
930 | zlog_debug( | |
931 | "LSA[Type%d:%s]: Refresh router-LSA for Area %s", | |
932 | lsa->data->type, | |
933 | inet_ntoa(lsa->data->id), area_str); | |
934 | ospf_refresher_unregister_lsa(ospf, lsa); | |
935 | ospf_lsa_flush_area(lsa, area); | |
936 | ospf_lsa_unlock(&area->router_lsa_self); | |
937 | area->router_lsa_self = NULL; | |
938 | ||
939 | /* Refresh router-LSA, (not install) and flood through | |
940 | * area. */ | |
941 | ospf_router_lsa_update_area(area); | |
942 | } else { | |
943 | rl = (struct router_lsa *)lsa->data; | |
944 | /* Refresh router-LSA, (not install) and flood through | |
945 | * area. */ | |
946 | if (rl->flags != ospf->flags) | |
947 | ospf_router_lsa_update_area(area); | |
948 | } | |
718e3744 | 949 | } |
718e3744 | 950 | |
d62a17ae | 951 | return 0; |
718e3744 | 952 | } |
953 | ||
6b0655a2 | 954 | |
718e3744 | 955 | /* network-LSA related functions. */ |
956 | /* Originate Network-LSA. */ | |
d62a17ae | 957 | static void ospf_network_lsa_body_set(struct stream *s, |
958 | struct ospf_interface *oi) | |
718e3744 | 959 | { |
d62a17ae | 960 | struct in_addr mask; |
961 | struct route_node *rn; | |
962 | struct ospf_neighbor *nbr; | |
718e3744 | 963 | |
d62a17ae | 964 | masklen2ip(oi->address->prefixlen, &mask); |
965 | stream_put_ipv4(s, mask.s_addr); | |
718e3744 | 966 | |
d62a17ae | 967 | /* The network-LSA lists those routers that are fully adjacent to |
968 | the Designated Router; each fully adjacent router is identified by | |
969 | its OSPF Router ID. The Designated Router includes itself in this | |
970 | list. RFC2328, Section 12.4.2 */ | |
718e3744 | 971 | |
d62a17ae | 972 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) |
973 | if ((nbr = rn->info) != NULL) | |
974 | if (nbr->state == NSM_Full || nbr == oi->nbr_self) | |
975 | stream_put_ipv4(s, nbr->router_id.s_addr); | |
718e3744 | 976 | } |
977 | ||
d62a17ae | 978 | static struct ospf_lsa *ospf_network_lsa_new(struct ospf_interface *oi) |
979 | { | |
980 | struct stream *s; | |
981 | struct ospf_lsa *new; | |
982 | struct lsa_header *lsah; | |
983 | struct ospf_if_params *oip; | |
984 | int length; | |
985 | ||
986 | /* If there are no neighbours on this network (the net is stub), | |
987 | the router does not originate network-LSA (see RFC 12.4.2) */ | |
988 | if (oi->full_nbrs == 0) | |
989 | return NULL; | |
990 | ||
991 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
992 | zlog_debug("LSA[Type2]: Create network-LSA instance"); | |
993 | ||
994 | /* Create new stream for LSA. */ | |
995 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
996 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
997 | ||
998 | lsa_header_set(s, (OPTIONS(oi) | LSA_OPTIONS_GET(oi->area)), | |
999 | OSPF_NETWORK_LSA, DR(oi), oi->ospf->router_id); | |
1000 | ||
1001 | /* Set network-LSA body fields. */ | |
1002 | ospf_network_lsa_body_set(s, oi); | |
1003 | ||
1004 | /* Set length. */ | |
1005 | length = stream_get_endp(s); | |
1006 | lsah->length = htons(length); | |
1007 | ||
1008 | /* Create OSPF LSA instance. */ | |
5b3d4186 | 1009 | new = ospf_lsa_new_and_data(length); |
d62a17ae | 1010 | |
1011 | new->area = oi->area; | |
1012 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
b5a8894d | 1013 | new->vrf_id = oi->ospf->vrf_id; |
d62a17ae | 1014 | |
1015 | /* Copy LSA to store. */ | |
d62a17ae | 1016 | memcpy(new->data, lsah, length); |
1017 | stream_free(s); | |
1018 | ||
1019 | /* Remember prior network LSA sequence numbers, even if we stop | |
1020 | * originating one for this oi, to try avoid re-originating LSAs with a | |
1021 | * prior sequence number, and thus speed up adjency forming & | |
1022 | * convergence. | |
1023 | */ | |
1024 | if ((oip = ospf_lookup_if_params(oi->ifp, oi->address->u.prefix4))) { | |
1025 | new->data->ls_seqnum = oip->network_lsa_seqnum; | |
1026 | new->data->ls_seqnum = lsa_seqnum_increment(new); | |
1027 | } else { | |
1028 | oip = ospf_get_if_params(oi->ifp, oi->address->u.prefix4); | |
1029 | ospf_if_update_params(oi->ifp, oi->address->u.prefix4); | |
1030 | } | |
1031 | oip->network_lsa_seqnum = new->data->ls_seqnum; | |
1032 | ||
1033 | return new; | |
718e3744 | 1034 | } |
1035 | ||
1036 | /* Originate network-LSA. */ | |
d62a17ae | 1037 | void ospf_network_lsa_update(struct ospf_interface *oi) |
718e3744 | 1038 | { |
d62a17ae | 1039 | struct ospf_lsa *new; |
718e3744 | 1040 | |
d62a17ae | 1041 | if (oi->network_lsa_self != NULL) { |
1042 | ospf_lsa_refresh(oi->ospf, oi->network_lsa_self); | |
1043 | return; | |
1044 | } | |
1045 | ||
1046 | /* Create new network-LSA instance. */ | |
1047 | new = ospf_network_lsa_new(oi); | |
1048 | if (new == NULL) | |
1049 | return; | |
718e3744 | 1050 | |
d62a17ae | 1051 | /* Install LSA to LSDB. */ |
1052 | new = ospf_lsa_install(oi->ospf, oi, new); | |
718e3744 | 1053 | |
d62a17ae | 1054 | /* Update LSA origination count. */ |
1055 | oi->ospf->lsa_originate_count++; | |
718e3744 | 1056 | |
d62a17ae | 1057 | /* Flooding new LSA through area. */ |
1058 | ospf_flood_through_area(oi->area, NULL, new); | |
1059 | ||
1060 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1061 | zlog_debug("LSA[Type%d:%s]: Originate network-LSA %p", | |
1062 | new->data->type, inet_ntoa(new->data->id), | |
1063 | (void *)new); | |
1064 | ospf_lsa_header_dump(new->data); | |
1065 | } | |
718e3744 | 1066 | |
d62a17ae | 1067 | return; |
718e3744 | 1068 | } |
1069 | ||
d62a17ae | 1070 | static struct ospf_lsa *ospf_network_lsa_refresh(struct ospf_lsa *lsa) |
1071 | { | |
1072 | struct ospf_area *area = lsa->area; | |
1073 | struct ospf_lsa *new, *new2; | |
1074 | struct ospf_if_params *oip; | |
1075 | struct ospf_interface *oi; | |
1076 | ||
1077 | assert(lsa->data); | |
1078 | ||
1079 | /* Retrieve the oi for the network LSA */ | |
1080 | oi = ospf_if_lookup_by_local_addr(area->ospf, NULL, lsa->data->id); | |
1081 | if (oi == NULL) { | |
1082 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1083 | zlog_debug( | |
3efd0893 | 1084 | "LSA[Type%d:%s]: network-LSA refresh: no oi found, ick, ignoring.", |
d62a17ae | 1085 | lsa->data->type, inet_ntoa(lsa->data->id)); |
1086 | ospf_lsa_header_dump(lsa->data); | |
1087 | } | |
1088 | return NULL; | |
1089 | } | |
1090 | /* Delete LSA from neighbor retransmit-list. */ | |
1091 | ospf_ls_retransmit_delete_nbr_area(area, lsa); | |
1092 | ||
1093 | /* Unregister LSA from refresh-list */ | |
1094 | ospf_refresher_unregister_lsa(area->ospf, lsa); | |
1095 | ||
1096 | /* Create new network-LSA instance. */ | |
1097 | new = ospf_network_lsa_new(oi); | |
1098 | if (new == NULL) | |
1099 | return NULL; | |
1100 | ||
1101 | oip = ospf_lookup_if_params(oi->ifp, oi->address->u.prefix4); | |
1102 | assert(oip != NULL); | |
1103 | oip->network_lsa_seqnum = new->data->ls_seqnum = | |
1104 | lsa_seqnum_increment(lsa); | |
1105 | ||
1106 | new2 = ospf_lsa_install(area->ospf, oi, new); | |
1107 | ||
1108 | assert(new2 == new); | |
1109 | ||
1110 | /* Flood LSA through aera. */ | |
1111 | ospf_flood_through_area(area, NULL, new); | |
1112 | ||
1113 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1114 | zlog_debug("LSA[Type%d:%s]: network-LSA refresh", | |
1115 | new->data->type, inet_ntoa(new->data->id)); | |
1116 | ospf_lsa_header_dump(new->data); | |
1117 | } | |
1118 | ||
1119 | return new; | |
1120 | } | |
1121 | ||
d7c0a89a | 1122 | static void stream_put_ospf_metric(struct stream *s, uint32_t metric_value) |
d62a17ae | 1123 | { |
d7c0a89a | 1124 | uint32_t metric; |
d62a17ae | 1125 | char *mp; |
1126 | ||
1127 | /* Put 0 metric. TOS metric is not supported. */ | |
1128 | metric = htonl(metric_value); | |
1129 | mp = (char *)&metric; | |
1130 | mp++; | |
1131 | stream_put(s, mp, 3); | |
718e3744 | 1132 | } |
1133 | ||
1134 | /* summary-LSA related functions. */ | |
d62a17ae | 1135 | static void ospf_summary_lsa_body_set(struct stream *s, struct prefix *p, |
d7c0a89a | 1136 | uint32_t metric) |
718e3744 | 1137 | { |
d62a17ae | 1138 | struct in_addr mask; |
718e3744 | 1139 | |
d62a17ae | 1140 | masklen2ip(p->prefixlen, &mask); |
718e3744 | 1141 | |
d62a17ae | 1142 | /* Put Network Mask. */ |
1143 | stream_put_ipv4(s, mask.s_addr); | |
718e3744 | 1144 | |
d62a17ae | 1145 | /* Set # TOS. */ |
d7c0a89a | 1146 | stream_putc(s, (uint8_t)0); |
718e3744 | 1147 | |
d62a17ae | 1148 | /* Set metric. */ |
1149 | stream_put_ospf_metric(s, metric); | |
718e3744 | 1150 | } |
1151 | ||
d62a17ae | 1152 | static struct ospf_lsa *ospf_summary_lsa_new(struct ospf_area *area, |
d7c0a89a | 1153 | struct prefix *p, uint32_t metric, |
d62a17ae | 1154 | struct in_addr id) |
718e3744 | 1155 | { |
d62a17ae | 1156 | struct stream *s; |
1157 | struct ospf_lsa *new; | |
1158 | struct lsa_header *lsah; | |
1159 | int length; | |
718e3744 | 1160 | |
d62a17ae | 1161 | if (id.s_addr == 0xffffffff) { |
1162 | /* Maybe Link State ID not available. */ | |
1163 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1164 | zlog_debug( | |
1165 | "LSA[Type%d]: Link ID not available, can't originate", | |
1166 | OSPF_SUMMARY_LSA); | |
1167 | return NULL; | |
1168 | } | |
c24d602e | 1169 | |
d62a17ae | 1170 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) |
1171 | zlog_debug("LSA[Type3]: Create summary-LSA instance"); | |
718e3744 | 1172 | |
d62a17ae | 1173 | /* Create new stream for LSA. */ |
1174 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1175 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
718e3744 | 1176 | |
d62a17ae | 1177 | lsa_header_set(s, LSA_OPTIONS_GET(area), OSPF_SUMMARY_LSA, id, |
1178 | area->ospf->router_id); | |
718e3744 | 1179 | |
d62a17ae | 1180 | /* Set summary-LSA body fields. */ |
1181 | ospf_summary_lsa_body_set(s, p, metric); | |
718e3744 | 1182 | |
d62a17ae | 1183 | /* Set length. */ |
1184 | length = stream_get_endp(s); | |
1185 | lsah->length = htons(length); | |
718e3744 | 1186 | |
d62a17ae | 1187 | /* Create OSPF LSA instance. */ |
5b3d4186 | 1188 | new = ospf_lsa_new_and_data(length); |
d62a17ae | 1189 | new->area = area; |
1190 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
b5a8894d | 1191 | new->vrf_id = area->ospf->vrf_id; |
718e3744 | 1192 | |
d62a17ae | 1193 | /* Copy LSA to store. */ |
d62a17ae | 1194 | memcpy(new->data, lsah, length); |
1195 | stream_free(s); | |
718e3744 | 1196 | |
d62a17ae | 1197 | return new; |
718e3744 | 1198 | } |
1199 | ||
1200 | /* Originate Summary-LSA. */ | |
d62a17ae | 1201 | struct ospf_lsa *ospf_summary_lsa_originate(struct prefix_ipv4 *p, |
d7c0a89a | 1202 | uint32_t metric, |
d62a17ae | 1203 | struct ospf_area *area) |
1204 | { | |
1205 | struct ospf_lsa *new; | |
1206 | struct in_addr id; | |
1207 | ||
1208 | id = ospf_lsa_unique_id(area->ospf, area->lsdb, OSPF_SUMMARY_LSA, p); | |
1209 | ||
1210 | if (id.s_addr == 0xffffffff) { | |
1211 | /* Maybe Link State ID not available. */ | |
1212 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1213 | zlog_debug( | |
1214 | "LSA[Type%d]: Link ID not available, can't originate", | |
1215 | OSPF_SUMMARY_LSA); | |
1216 | return NULL; | |
1217 | } | |
1218 | ||
1219 | /* Create new summary-LSA instance. */ | |
1220 | if (!(new = ospf_summary_lsa_new(area, (struct prefix *)p, metric, id))) | |
1221 | return NULL; | |
1222 | ||
1223 | /* Instlal LSA to LSDB. */ | |
1224 | new = ospf_lsa_install(area->ospf, NULL, new); | |
1225 | ||
1226 | /* Update LSA origination count. */ | |
1227 | area->ospf->lsa_originate_count++; | |
1228 | ||
1229 | /* Flooding new LSA through area. */ | |
1230 | ospf_flood_through_area(area, NULL, new); | |
1231 | ||
1232 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1233 | zlog_debug("LSA[Type%d:%s]: Originate summary-LSA %p", | |
1234 | new->data->type, inet_ntoa(new->data->id), | |
1235 | (void *)new); | |
1236 | ospf_lsa_header_dump(new->data); | |
1237 | } | |
1238 | ||
1239 | return new; | |
1240 | } | |
1241 | ||
1242 | static struct ospf_lsa *ospf_summary_lsa_refresh(struct ospf *ospf, | |
1243 | struct ospf_lsa *lsa) | |
1244 | { | |
1245 | struct ospf_lsa *new; | |
1246 | struct summary_lsa *sl; | |
1247 | struct prefix p; | |
1248 | ||
1249 | /* Sanity check. */ | |
1250 | assert(lsa->data); | |
1251 | ||
1252 | sl = (struct summary_lsa *)lsa->data; | |
1253 | p.prefixlen = ip_masklen(sl->mask); | |
1254 | new = ospf_summary_lsa_new(lsa->area, &p, GET_METRIC(sl->metric), | |
1255 | sl->header.id); | |
1256 | ||
1257 | if (!new) | |
1258 | return NULL; | |
1259 | ||
1260 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
1261 | ||
1262 | ospf_lsa_install(ospf, NULL, new); | |
1263 | ||
1264 | /* Flood LSA through AS. */ | |
1265 | ospf_flood_through_area(new->area, NULL, new); | |
1266 | ||
1267 | /* Debug logging. */ | |
1268 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1269 | zlog_debug("LSA[Type%d:%s]: summary-LSA refresh", | |
1270 | new->data->type, inet_ntoa(new->data->id)); | |
1271 | ospf_lsa_header_dump(new->data); | |
1272 | } | |
1273 | ||
1274 | return new; | |
718e3744 | 1275 | } |
1276 | ||
6b0655a2 | 1277 | |
718e3744 | 1278 | /* summary-ASBR-LSA related functions. */ |
d62a17ae | 1279 | static void ospf_summary_asbr_lsa_body_set(struct stream *s, struct prefix *p, |
d7c0a89a | 1280 | uint32_t metric) |
718e3744 | 1281 | { |
d62a17ae | 1282 | /* Put Network Mask. */ |
d7c0a89a | 1283 | stream_put_ipv4(s, (uint32_t)0); |
718e3744 | 1284 | |
d62a17ae | 1285 | /* Set # TOS. */ |
d7c0a89a | 1286 | stream_putc(s, (uint8_t)0); |
718e3744 | 1287 | |
d62a17ae | 1288 | /* Set metric. */ |
1289 | stream_put_ospf_metric(s, metric); | |
718e3744 | 1290 | } |
1291 | ||
d62a17ae | 1292 | static struct ospf_lsa *ospf_summary_asbr_lsa_new(struct ospf_area *area, |
1293 | struct prefix *p, | |
d7c0a89a | 1294 | uint32_t metric, |
d62a17ae | 1295 | struct in_addr id) |
718e3744 | 1296 | { |
d62a17ae | 1297 | struct stream *s; |
1298 | struct ospf_lsa *new; | |
1299 | struct lsa_header *lsah; | |
1300 | int length; | |
718e3744 | 1301 | |
d62a17ae | 1302 | if (id.s_addr == 0xffffffff) { |
1303 | /* Maybe Link State ID not available. */ | |
1304 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1305 | zlog_debug( | |
1306 | "LSA[Type%d]: Link ID not available, can't originate", | |
1307 | OSPF_ASBR_SUMMARY_LSA); | |
1308 | return NULL; | |
1309 | } | |
c24d602e | 1310 | |
d62a17ae | 1311 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) |
1312 | zlog_debug("LSA[Type3]: Create summary-LSA instance"); | |
718e3744 | 1313 | |
d62a17ae | 1314 | /* Create new stream for LSA. */ |
1315 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1316 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
718e3744 | 1317 | |
d62a17ae | 1318 | lsa_header_set(s, LSA_OPTIONS_GET(area), OSPF_ASBR_SUMMARY_LSA, id, |
1319 | area->ospf->router_id); | |
718e3744 | 1320 | |
d62a17ae | 1321 | /* Set summary-LSA body fields. */ |
1322 | ospf_summary_asbr_lsa_body_set(s, p, metric); | |
718e3744 | 1323 | |
d62a17ae | 1324 | /* Set length. */ |
1325 | length = stream_get_endp(s); | |
1326 | lsah->length = htons(length); | |
718e3744 | 1327 | |
d62a17ae | 1328 | /* Create OSPF LSA instance. */ |
5b3d4186 | 1329 | new = ospf_lsa_new_and_data(length); |
d62a17ae | 1330 | new->area = area; |
1331 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
b5a8894d | 1332 | new->vrf_id = area->ospf->vrf_id; |
718e3744 | 1333 | |
d62a17ae | 1334 | /* Copy LSA to store. */ |
d62a17ae | 1335 | memcpy(new->data, lsah, length); |
1336 | stream_free(s); | |
718e3744 | 1337 | |
d62a17ae | 1338 | return new; |
718e3744 | 1339 | } |
1340 | ||
1341 | /* Originate summary-ASBR-LSA. */ | |
d62a17ae | 1342 | struct ospf_lsa *ospf_summary_asbr_lsa_originate(struct prefix_ipv4 *p, |
d7c0a89a | 1343 | uint32_t metric, |
d62a17ae | 1344 | struct ospf_area *area) |
1345 | { | |
1346 | struct ospf_lsa *new; | |
1347 | struct in_addr id; | |
1348 | ||
1349 | id = ospf_lsa_unique_id(area->ospf, area->lsdb, OSPF_ASBR_SUMMARY_LSA, | |
1350 | p); | |
1351 | ||
1352 | if (id.s_addr == 0xffffffff) { | |
1353 | /* Maybe Link State ID not available. */ | |
1354 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1355 | zlog_debug( | |
1356 | "LSA[Type%d]: Link ID not available, can't originate", | |
1357 | OSPF_ASBR_SUMMARY_LSA); | |
1358 | return NULL; | |
1359 | } | |
1360 | ||
1361 | /* Create new summary-LSA instance. */ | |
1362 | new = ospf_summary_asbr_lsa_new(area, (struct prefix *)p, metric, id); | |
1363 | if (!new) | |
1364 | return NULL; | |
1365 | ||
1366 | /* Install LSA to LSDB. */ | |
1367 | new = ospf_lsa_install(area->ospf, NULL, new); | |
718e3744 | 1368 | |
d62a17ae | 1369 | /* Update LSA origination count. */ |
1370 | area->ospf->lsa_originate_count++; | |
718e3744 | 1371 | |
d62a17ae | 1372 | /* Flooding new LSA through area. */ |
1373 | ospf_flood_through_area(area, NULL, new); | |
718e3744 | 1374 | |
d62a17ae | 1375 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { |
1376 | zlog_debug("LSA[Type%d:%s]: Originate summary-ASBR-LSA %p", | |
1377 | new->data->type, inet_ntoa(new->data->id), | |
1378 | (void *)new); | |
1379 | ospf_lsa_header_dump(new->data); | |
1380 | } | |
1381 | ||
1382 | return new; | |
1383 | } | |
1384 | ||
1385 | static struct ospf_lsa *ospf_summary_asbr_lsa_refresh(struct ospf *ospf, | |
1386 | struct ospf_lsa *lsa) | |
1387 | { | |
1388 | struct ospf_lsa *new; | |
1389 | struct summary_lsa *sl; | |
1390 | struct prefix p; | |
1391 | ||
1392 | /* Sanity check. */ | |
1393 | assert(lsa->data); | |
1394 | ||
1395 | sl = (struct summary_lsa *)lsa->data; | |
1396 | p.prefixlen = ip_masklen(sl->mask); | |
1397 | new = ospf_summary_asbr_lsa_new(lsa->area, &p, GET_METRIC(sl->metric), | |
1398 | sl->header.id); | |
1399 | if (!new) | |
1400 | return NULL; | |
1401 | ||
1402 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
1403 | ||
1404 | ospf_lsa_install(ospf, NULL, new); | |
1405 | ||
1406 | /* Flood LSA through area. */ | |
1407 | ospf_flood_through_area(new->area, NULL, new); | |
1408 | ||
1409 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1410 | zlog_debug("LSA[Type%d:%s]: summary-ASBR-LSA refresh", | |
1411 | new->data->type, inet_ntoa(new->data->id)); | |
1412 | ospf_lsa_header_dump(new->data); | |
1413 | } | |
1414 | ||
1415 | return new; | |
718e3744 | 1416 | } |
1417 | ||
1418 | /* AS-external-LSA related functions. */ | |
1419 | ||
1420 | /* Get nexthop for AS-external-LSAs. Return nexthop if its interface | |
1421 | is connected, else 0*/ | |
d62a17ae | 1422 | static struct in_addr ospf_external_lsa_nexthop_get(struct ospf *ospf, |
1423 | struct in_addr nexthop) | |
718e3744 | 1424 | { |
d62a17ae | 1425 | struct in_addr fwd; |
1426 | struct prefix nh; | |
1427 | struct listnode *node; | |
1428 | struct ospf_interface *oi; | |
1429 | ||
1430 | fwd.s_addr = 0; | |
718e3744 | 1431 | |
d62a17ae | 1432 | if (!nexthop.s_addr) |
1433 | return fwd; | |
718e3744 | 1434 | |
d62a17ae | 1435 | /* Check whether nexthop is covered by OSPF network. */ |
1436 | nh.family = AF_INET; | |
1437 | nh.u.prefix4 = nexthop; | |
1438 | nh.prefixlen = IPV4_MAX_BITLEN; | |
718e3744 | 1439 | |
d62a17ae | 1440 | /* XXX/SCALE: If there were a lot of oi's on an ifp, then it'd be |
1441 | * better to make use of the per-ifp table of ois. | |
1442 | */ | |
1443 | for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) | |
1444 | if (if_is_operative(oi->ifp)) | |
1445 | if (oi->address->family == AF_INET) | |
1446 | if (prefix_match(oi->address, &nh)) | |
1447 | return nexthop; | |
718e3744 | 1448 | |
d62a17ae | 1449 | return fwd; |
718e3744 | 1450 | } |
1451 | ||
718e3744 | 1452 | /* NSSA-external-LSA related functions. */ |
1453 | ||
1454 | /* Get 1st IP connection for Forward Addr */ | |
4dadc291 | 1455 | |
d62a17ae | 1456 | struct in_addr ospf_get_ip_from_ifp(struct ospf_interface *oi) |
718e3744 | 1457 | { |
d62a17ae | 1458 | struct in_addr fwd; |
718e3744 | 1459 | |
975a328e | 1460 | fwd.s_addr = INADDR_ANY; |
718e3744 | 1461 | |
d62a17ae | 1462 | if (if_is_operative(oi->ifp)) |
1463 | return oi->address->u.prefix4; | |
1464 | ||
1465 | return fwd; | |
718e3744 | 1466 | } |
1467 | ||
1468 | /* Get 1st IP connection for Forward Addr */ | |
d62a17ae | 1469 | struct in_addr ospf_get_nssa_ip(struct ospf_area *area) |
1470 | { | |
1471 | struct in_addr fwd; | |
1472 | struct in_addr best_default; | |
1473 | struct listnode *node; | |
1474 | struct ospf_interface *oi; | |
1475 | ||
1476 | fwd.s_addr = 0; | |
1477 | best_default.s_addr = 0; | |
1478 | ||
1479 | for (ALL_LIST_ELEMENTS_RO(area->ospf->oiflist, node, oi)) { | |
1480 | if (if_is_operative(oi->ifp)) | |
1481 | if (oi->area->external_routing == OSPF_AREA_NSSA) | |
1482 | if (oi->address | |
1483 | && oi->address->family == AF_INET) { | |
1484 | if (best_default.s_addr == 0) | |
1485 | best_default = | |
1486 | oi->address->u.prefix4; | |
1487 | if (oi->area == area) | |
1488 | return oi->address->u.prefix4; | |
1489 | } | |
1490 | } | |
1491 | if (best_default.s_addr != 0) | |
1492 | return best_default; | |
718e3744 | 1493 | |
d62a17ae | 1494 | if (best_default.s_addr != 0) |
1495 | return best_default; | |
68980084 | 1496 | |
d62a17ae | 1497 | return fwd; |
718e3744 | 1498 | } |
beebba75 | 1499 | |
d7c0a89a | 1500 | int metric_type(struct ospf *ospf, uint8_t src, unsigned short instance) |
718e3744 | 1501 | { |
d62a17ae | 1502 | struct ospf_redist *red; |
7c8ff89e | 1503 | |
d62a17ae | 1504 | red = ospf_redist_lookup(ospf, src, instance); |
7c8ff89e | 1505 | |
d62a17ae | 1506 | return ((!red || red->dmetric.type < 0) ? DEFAULT_METRIC_TYPE |
1507 | : red->dmetric.type); | |
718e3744 | 1508 | } |
1509 | ||
d7c0a89a | 1510 | int metric_value(struct ospf *ospf, uint8_t src, unsigned short instance) |
718e3744 | 1511 | { |
d62a17ae | 1512 | struct ospf_redist *red; |
7c8ff89e | 1513 | |
d62a17ae | 1514 | red = ospf_redist_lookup(ospf, src, instance); |
1515 | if (!red || red->dmetric.value < 0) { | |
1516 | if (src == DEFAULT_ROUTE) { | |
1517 | if (ospf->default_originate == DEFAULT_ORIGINATE_ZEBRA) | |
1518 | return DEFAULT_DEFAULT_ORIGINATE_METRIC; | |
1519 | else | |
1520 | return DEFAULT_DEFAULT_ALWAYS_METRIC; | |
1521 | } else if (ospf->default_metric < 0) | |
1522 | return DEFAULT_DEFAULT_METRIC; | |
1523 | else | |
1524 | return ospf->default_metric; | |
718e3744 | 1525 | } |
718e3744 | 1526 | |
d62a17ae | 1527 | return red->dmetric.value; |
718e3744 | 1528 | } |
1529 | ||
1530 | /* Set AS-external-LSA body. */ | |
d62a17ae | 1531 | static void ospf_external_lsa_body_set(struct stream *s, |
1532 | struct external_info *ei, | |
1533 | struct ospf *ospf) | |
1534 | { | |
1535 | struct prefix_ipv4 *p = &ei->p; | |
1536 | struct in_addr mask, fwd_addr; | |
d7c0a89a | 1537 | uint32_t mvalue; |
d62a17ae | 1538 | int mtype; |
1539 | int type; | |
d7c0a89a | 1540 | unsigned short instance; |
d62a17ae | 1541 | |
1542 | /* Put Network Mask. */ | |
1543 | masklen2ip(p->prefixlen, &mask); | |
1544 | stream_put_ipv4(s, mask.s_addr); | |
1545 | ||
1546 | /* If prefix is default, specify DEFAULT_ROUTE. */ | |
1547 | type = is_prefix_default(&ei->p) ? DEFAULT_ROUTE : ei->type; | |
1548 | instance = is_prefix_default(&ei->p) ? 0 : ei->instance; | |
1549 | ||
1550 | mtype = (ROUTEMAP_METRIC_TYPE(ei) != -1) | |
1551 | ? ROUTEMAP_METRIC_TYPE(ei) | |
1552 | : metric_type(ospf, type, instance); | |
1553 | ||
1554 | mvalue = (ROUTEMAP_METRIC(ei) != -1) | |
1555 | ? ROUTEMAP_METRIC(ei) | |
1556 | : metric_value(ospf, type, instance); | |
1557 | ||
1558 | /* Put type of external metric. */ | |
1559 | stream_putc(s, (mtype == EXTERNAL_METRIC_TYPE_2 ? 0x80 : 0)); | |
1560 | ||
1561 | /* Put 0 metric. TOS metric is not supported. */ | |
1562 | stream_put_ospf_metric(s, mvalue); | |
1563 | ||
1564 | /* Get forwarding address to nexthop if on the Connection List, else 0. | |
1565 | */ | |
1566 | fwd_addr = ospf_external_lsa_nexthop_get(ospf, ei->nexthop); | |
1567 | ||
1568 | /* Put forwarding address. */ | |
1569 | stream_put_ipv4(s, fwd_addr.s_addr); | |
1570 | ||
1571 | /* Put route tag */ | |
1572 | stream_putl(s, ei->tag); | |
718e3744 | 1573 | } |
1574 | ||
1575 | /* Create new external-LSA. */ | |
d62a17ae | 1576 | static struct ospf_lsa *ospf_external_lsa_new(struct ospf *ospf, |
1577 | struct external_info *ei, | |
1578 | struct in_addr *old_id) | |
1579 | { | |
1580 | struct stream *s; | |
1581 | struct lsa_header *lsah; | |
1582 | struct ospf_lsa *new; | |
1583 | struct in_addr id; | |
1584 | int length; | |
1585 | ||
1586 | if (ei == NULL) { | |
1587 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1588 | zlog_debug( | |
1589 | "LSA[Type5]: External info is NULL, can't originate"); | |
1590 | return NULL; | |
1591 | } | |
1592 | ||
1593 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1594 | zlog_debug("LSA[Type5]: Originate AS-external-LSA instance"); | |
1595 | ||
1596 | /* If old Link State ID is specified, refresh LSA with same ID. */ | |
1597 | if (old_id) | |
1598 | id = *old_id; | |
1599 | /* Get Link State with unique ID. */ | |
1600 | else { | |
1601 | id = ospf_lsa_unique_id(ospf, ospf->lsdb, OSPF_AS_EXTERNAL_LSA, | |
1602 | &ei->p); | |
1603 | if (id.s_addr == 0xffffffff) { | |
1604 | /* Maybe Link State ID not available. */ | |
1605 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1606 | zlog_debug( | |
1607 | "LSA[Type5]: Link ID not available, can't originate"); | |
1608 | return NULL; | |
1609 | } | |
1610 | } | |
1611 | ||
1612 | /* Create new stream for LSA. */ | |
1613 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1614 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
1615 | ||
1616 | /* Set LSA common header fields. */ | |
1617 | lsa_header_set(s, OSPF_OPTION_E, OSPF_AS_EXTERNAL_LSA, id, | |
1618 | ospf->router_id); | |
1619 | ||
1620 | /* Set AS-external-LSA body fields. */ | |
1621 | ospf_external_lsa_body_set(s, ei, ospf); | |
1622 | ||
1623 | /* Set length. */ | |
1624 | length = stream_get_endp(s); | |
1625 | lsah->length = htons(length); | |
1626 | ||
1627 | /* Now, create OSPF LSA instance. */ | |
5b3d4186 | 1628 | new = ospf_lsa_new_and_data(length); |
d62a17ae | 1629 | new->area = NULL; |
1630 | SET_FLAG(new->flags, | |
1631 | OSPF_LSA_SELF | OSPF_LSA_APPROVED | OSPF_LSA_SELF_CHECKED); | |
b5a8894d | 1632 | new->vrf_id = ospf->vrf_id; |
d62a17ae | 1633 | |
1634 | /* Copy LSA data to store, discard stream. */ | |
d62a17ae | 1635 | memcpy(new->data, lsah, length); |
1636 | stream_free(s); | |
1637 | ||
1638 | return new; | |
718e3744 | 1639 | } |
1640 | ||
718e3744 | 1641 | /* As Type-7 */ |
d62a17ae | 1642 | static void ospf_install_flood_nssa(struct ospf *ospf, struct ospf_lsa *lsa, |
1643 | struct external_info *ei) | |
1644 | { | |
1645 | struct ospf_lsa *new; | |
1646 | struct as_external_lsa *extlsa; | |
1647 | struct ospf_area *area; | |
1648 | struct listnode *node, *nnode; | |
1649 | ||
1650 | /* LSA may be a Type-5 originated via translation of a Type-7 LSA | |
1651 | * which originated from an NSSA area. In which case it should not be | |
1652 | * flooded back to NSSA areas. | |
1653 | */ | |
1654 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
1655 | return; | |
1656 | ||
1657 | /* NSSA Originate or Refresh (If anyNSSA) | |
1658 | ||
1659 | LSA is self-originated. And just installed as Type-5. | |
1660 | Additionally, install as Type-7 LSDB for every attached NSSA. | |
1661 | ||
1662 | P-Bit controls which ABR performs translation to outside world; If | |
1663 | we are an ABR....do not set the P-bit, because we send the Type-5, | |
1664 | not as the ABR Translator, but as the ASBR owner within the AS! | |
1665 | ||
1666 | If we are NOT ABR, Flood through NSSA as Type-7 w/P-bit set. The | |
1667 | elected ABR Translator will see the P-bit, Translate, and re-flood. | |
1668 | ||
1669 | Later, ABR_TASK and P-bit will scan Type-7 LSDB and translate to | |
1670 | Type-5's to non-NSSA Areas. (it will also attempt a re-install) */ | |
1671 | ||
1672 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
1673 | /* Don't install Type-7 LSA's into nonNSSA area */ | |
1674 | if (area->external_routing != OSPF_AREA_NSSA) | |
1675 | continue; | |
1676 | ||
1677 | /* make lsa duplicate, lock=1 */ | |
1678 | new = ospf_lsa_dup(lsa); | |
1679 | new->area = area; | |
1680 | new->data->type = OSPF_AS_NSSA_LSA; | |
1681 | ||
1682 | /* set P-bit if not ABR */ | |
1683 | if (!IS_OSPF_ABR(ospf)) { | |
1684 | SET_FLAG(new->data->options, OSPF_OPTION_NP); | |
1685 | ||
1686 | /* set non-zero FWD ADDR | |
1687 | ||
1688 | draft-ietf-ospf-nssa-update-09.txt | |
1689 | ||
1690 | if the network between the NSSA AS boundary router and | |
1691 | the | |
1692 | adjacent AS is advertised into OSPF as an internal OSPF | |
1693 | route, | |
1694 | the forwarding address should be the next op address as | |
1695 | is cu | |
1696 | currently done with type-5 LSAs. If the intervening | |
1697 | network is | |
1698 | not adversited into OSPF as an internal OSPF route and | |
1699 | the | |
1700 | type-7 LSA's P-bit is set a forwarding address should be | |
87bd50e8 | 1701 | selected from one of the router's active OSPF interface |
d62a17ae | 1702 | addresses |
1703 | which belong to the NSSA. If no such addresses exist, | |
1704 | then | |
1705 | no type-7 LSA's with the P-bit set should originate from | |
1706 | this | |
1707 | router. */ | |
1708 | ||
1709 | /* kevinm: not updating lsa anymore, just new */ | |
1710 | extlsa = (struct as_external_lsa *)(new->data); | |
1711 | ||
1712 | if (extlsa->e[0].fwd_addr.s_addr == 0) | |
1713 | extlsa->e[0].fwd_addr = ospf_get_nssa_ip( | |
1714 | area); /* this NSSA area in ifp */ | |
1715 | ||
1716 | if (extlsa->e[0].fwd_addr.s_addr == 0) { | |
1717 | if (IS_DEBUG_OSPF_NSSA) | |
1718 | zlog_debug( | |
1719 | "LSA[Type-7]: Could not build FWD-ADDR"); | |
1720 | ospf_lsa_discard(new); | |
1721 | return; | |
1722 | } | |
1723 | } | |
1724 | ||
1725 | /* install also as Type-7 */ | |
1726 | ospf_lsa_install(ospf, NULL, | |
1727 | new); /* Remove Old, Lock New = 2 */ | |
1728 | ||
1729 | /* will send each copy, lock=2+n */ | |
1730 | ospf_flood_through_as( | |
1731 | ospf, NULL, new); /* all attached NSSA's, no AS/STUBs */ | |
1732 | } | |
d4a53d58 | 1733 | } |
1734 | ||
d62a17ae | 1735 | static struct ospf_lsa *ospf_lsa_translated_nssa_new(struct ospf *ospf, |
1736 | struct ospf_lsa *type7) | |
1737 | { | |
1738 | ||
1739 | struct ospf_lsa *new; | |
1740 | struct as_external_lsa *ext, *extnew; | |
1741 | struct external_info ei; | |
1742 | ||
1743 | ext = (struct as_external_lsa *)(type7->data); | |
1744 | ||
1745 | /* need external_info struct, fill in bare minimum */ | |
1746 | ei.p.family = AF_INET; | |
1747 | ei.p.prefix = type7->data->id; | |
1748 | ei.p.prefixlen = ip_masklen(ext->mask); | |
1749 | ei.type = ZEBRA_ROUTE_OSPF; | |
1750 | ei.nexthop = ext->header.adv_router; | |
1751 | ei.route_map_set.metric = -1; | |
1752 | ei.route_map_set.metric_type = -1; | |
1753 | ei.tag = 0; | |
12a81f8e | 1754 | ei.instance = 0; |
d62a17ae | 1755 | |
1756 | if ((new = ospf_external_lsa_new(ospf, &ei, &type7->data->id)) | |
1757 | == NULL) { | |
1758 | if (IS_DEBUG_OSPF_NSSA) | |
1759 | zlog_debug( | |
3efd0893 | 1760 | "ospf_nssa_translate_originate(): Could not originate Translated Type-5 for %s", |
d62a17ae | 1761 | inet_ntoa(ei.p.prefix)); |
1762 | return NULL; | |
1763 | } | |
1764 | ||
1765 | extnew = (struct as_external_lsa *)(new->data); | |
1766 | ||
1767 | /* copy over Type-7 data to new */ | |
1768 | extnew->e[0].tos = ext->e[0].tos; | |
1769 | extnew->e[0].route_tag = ext->e[0].route_tag; | |
1770 | extnew->e[0].fwd_addr.s_addr = ext->e[0].fwd_addr.s_addr; | |
1771 | new->data->ls_seqnum = type7->data->ls_seqnum; | |
1772 | ||
1773 | /* add translated flag, checksum and lock new lsa */ | |
1774 | SET_FLAG(new->flags, OSPF_LSA_LOCAL_XLT); /* Translated from 7 */ | |
1775 | new = ospf_lsa_lock(new); | |
1776 | ||
1777 | return new; | |
d4a53d58 | 1778 | } |
1779 | ||
d4a53d58 | 1780 | /* Originate Translated Type-5 for supplied Type-7 NSSA LSA */ |
d62a17ae | 1781 | struct ospf_lsa *ospf_translated_nssa_originate(struct ospf *ospf, |
1782 | struct ospf_lsa *type7) | |
1783 | { | |
1784 | struct ospf_lsa *new; | |
1785 | struct as_external_lsa *extnew; | |
1786 | ||
1787 | /* we cant use ospf_external_lsa_originate() as we need to set | |
1788 | * the OSPF_LSA_LOCAL_XLT flag, must originate by hand | |
1789 | */ | |
1790 | ||
1791 | if ((new = ospf_lsa_translated_nssa_new(ospf, type7)) == NULL) { | |
1792 | if (IS_DEBUG_OSPF_NSSA) | |
1793 | zlog_debug( | |
3efd0893 | 1794 | "ospf_translated_nssa_originate(): Could not translate Type-7, Id %s, to Type-5", |
d62a17ae | 1795 | inet_ntoa(type7->data->id)); |
1796 | return NULL; | |
1797 | } | |
1798 | ||
919714bd | 1799 | extnew = (struct as_external_lsa *)new->data; |
1800 | ||
1801 | if ((new = ospf_lsa_install(ospf, NULL, new)) == NULL) { | |
1802 | flog_warn( | |
1803 | EC_OSPF_LSA_INSTALL_FAILURE, | |
1804 | "ospf_lsa_translated_nssa_originate(): Could not install LSA id %s", | |
1805 | inet_ntoa(type7->data->id)); | |
1806 | return NULL; | |
1807 | } | |
d62a17ae | 1808 | |
1809 | if (IS_DEBUG_OSPF_NSSA) { | |
1810 | zlog_debug( | |
3efd0893 | 1811 | "ospf_translated_nssa_originate(): translated Type 7, installed:"); |
d62a17ae | 1812 | ospf_lsa_header_dump(new->data); |
1813 | zlog_debug(" Network mask: %d", ip_masklen(extnew->mask)); | |
1814 | zlog_debug(" Forward addr: %s", | |
1815 | inet_ntoa(extnew->e[0].fwd_addr)); | |
1816 | } | |
1817 | ||
d62a17ae | 1818 | ospf->lsa_originate_count++; |
1819 | ospf_flood_through_as(ospf, NULL, new); | |
1820 | ||
1821 | return new; | |
d4a53d58 | 1822 | } |
1823 | ||
1824 | /* Refresh Translated from NSSA AS-external-LSA. */ | |
d62a17ae | 1825 | struct ospf_lsa *ospf_translated_nssa_refresh(struct ospf *ospf, |
1826 | struct ospf_lsa *type7, | |
1827 | struct ospf_lsa *type5) | |
1828 | { | |
1829 | struct ospf_lsa *new = NULL; | |
1830 | ||
1831 | /* Sanity checks. */ | |
1832 | assert(type7 || type5); | |
1833 | if (!(type7 || type5)) | |
1834 | return NULL; | |
1835 | if (type7) | |
1836 | assert(type7->data); | |
1837 | if (type5) | |
1838 | assert(type5->data); | |
1839 | assert(ospf->anyNSSA); | |
1840 | ||
1841 | /* get required data according to what has been given */ | |
1842 | if (type7 && type5 == NULL) { | |
1843 | /* find the translated Type-5 for this Type-7 */ | |
1844 | struct as_external_lsa *ext = | |
1845 | (struct as_external_lsa *)(type7->data); | |
1846 | struct prefix_ipv4 p = { | |
1847 | .prefix = type7->data->id, | |
1848 | .prefixlen = ip_masklen(ext->mask), | |
1849 | .family = AF_INET, | |
1850 | }; | |
1851 | ||
1852 | type5 = ospf_external_info_find_lsa(ospf, &p); | |
1853 | } else if (type5 && type7 == NULL) { | |
1854 | /* find the type-7 from which supplied type-5 was translated, | |
1855 | * ie find first type-7 with same LSA Id. | |
1856 | */ | |
1857 | struct listnode *ln, *lnn; | |
1858 | struct route_node *rn; | |
1859 | struct ospf_lsa *lsa; | |
1860 | struct ospf_area *area; | |
1861 | ||
1862 | for (ALL_LIST_ELEMENTS(ospf->areas, ln, lnn, area)) { | |
1863 | if (area->external_routing != OSPF_AREA_NSSA && !type7) | |
1864 | continue; | |
1865 | ||
044506e7 | 1866 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) { |
d62a17ae | 1867 | if (lsa->data->id.s_addr |
1868 | == type5->data->id.s_addr) { | |
1869 | type7 = lsa; | |
1870 | break; | |
1871 | } | |
1872 | } | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | /* do we have type7? */ | |
1877 | if (!type7) { | |
1878 | if (IS_DEBUG_OSPF_NSSA) | |
1879 | zlog_debug( | |
3efd0893 | 1880 | "ospf_translated_nssa_refresh(): no Type-7 found for Type-5 LSA Id %s", |
a3904dd3 | 1881 | inet_ntoa(type5->data->id)); |
d62a17ae | 1882 | return NULL; |
1883 | } | |
1884 | ||
1885 | /* do we have valid translated type5? */ | |
1886 | if (type5 == NULL || !CHECK_FLAG(type5->flags, OSPF_LSA_LOCAL_XLT)) { | |
1887 | if (IS_DEBUG_OSPF_NSSA) | |
1888 | zlog_debug( | |
3efd0893 | 1889 | "ospf_translated_nssa_refresh(): No translated Type-5 found for Type-7 with Id %s", |
74d638d5 | 1890 | inet_ntoa(type7->data->id)); |
d62a17ae | 1891 | return NULL; |
1892 | } | |
1893 | ||
1894 | /* Delete LSA from neighbor retransmit-list. */ | |
1895 | ospf_ls_retransmit_delete_nbr_as(ospf, type5); | |
1896 | ||
1897 | /* create new translated LSA */ | |
1898 | if ((new = ospf_lsa_translated_nssa_new(ospf, type7)) == NULL) { | |
1899 | if (IS_DEBUG_OSPF_NSSA) | |
1900 | zlog_debug( | |
3efd0893 | 1901 | "ospf_translated_nssa_refresh(): Could not translate Type-7 for %s to Type-5", |
74d638d5 | 1902 | inet_ntoa(type7->data->id)); |
d62a17ae | 1903 | return NULL; |
1904 | } | |
1905 | ||
1906 | if (!(new = ospf_lsa_install(ospf, NULL, new))) { | |
542a208f | 1907 | flog_warn( |
cf444bcf | 1908 | EC_OSPF_LSA_INSTALL_FAILURE, |
542a208f DS |
1909 | "ospf_translated_nssa_refresh(): Could not install translated LSA, Id %s", |
1910 | inet_ntoa(type7->data->id)); | |
d62a17ae | 1911 | return NULL; |
1912 | } | |
1913 | ||
1914 | /* Flood LSA through area. */ | |
1915 | ospf_flood_through_as(ospf, NULL, new); | |
1916 | ||
1917 | return new; | |
1918 | } | |
1919 | ||
1920 | int is_prefix_default(struct prefix_ipv4 *p) | |
1921 | { | |
1922 | struct prefix_ipv4 q; | |
1923 | ||
1924 | q.family = AF_INET; | |
975a328e | 1925 | q.prefix.s_addr = INADDR_ANY; |
d62a17ae | 1926 | q.prefixlen = 0; |
1927 | ||
1928 | return prefix_same((struct prefix *)p, (struct prefix *)&q); | |
718e3744 | 1929 | } |
1930 | ||
1931 | /* Originate an AS-external-LSA, install and flood. */ | |
d62a17ae | 1932 | struct ospf_lsa *ospf_external_lsa_originate(struct ospf *ospf, |
1933 | struct external_info *ei) | |
1934 | { | |
1935 | struct ospf_lsa *new; | |
1936 | ||
1937 | /* Added for NSSA project.... | |
1938 | ||
1939 | External LSAs are originated in ASBRs as usual, but for NSSA | |
1940 | systems. | |
1941 | there is the global Type-5 LSDB and a Type-7 LSDB installed for | |
1942 | every area. The Type-7's are flooded to every IR and every ABR; We | |
1943 | install the Type-5 LSDB so that the normal "refresh" code operates | |
1944 | as usual, and flag them as not used during ASE calculations. The | |
1945 | Type-7 LSDB is used for calculations. Each Type-7 has a Forwarding | |
1946 | Address of non-zero. | |
1947 | ||
1948 | If an ABR is the elected NSSA translator, following SPF and during | |
1949 | the ABR task it will translate all the scanned Type-7's, with P-bit | |
1950 | ON and not-self generated, and translate to Type-5's throughout the | |
1951 | non-NSSA/STUB AS. | |
1952 | ||
1953 | A difference in operation depends whether this ASBR is an ABR | |
1954 | or not. If not an ABR, the P-bit is ON, to indicate that any | |
1955 | elected NSSA-ABR can perform its translation. | |
1956 | ||
1957 | If an ABR, the P-bit is OFF; No ABR will perform translation and | |
1958 | this ASBR will flood the Type-5 LSA as usual. | |
1959 | ||
1960 | For the case where this ASBR is not an ABR, the ASE calculations | |
1961 | are based on the Type-5 LSDB; The Type-7 LSDB exists just to | |
1962 | demonstrate to the user that there are LSA's that belong to any | |
1963 | attached NSSA. | |
1964 | ||
1965 | Finally, it just so happens that when the ABR is translating every | |
1966 | Type-7 into Type-5, it installs it into the Type-5 LSDB as an | |
1967 | approved Type-5 (translated from Type-7); at the end of translation | |
1968 | if any Translated Type-5's remain unapproved, then they must be | |
1969 | flushed from the AS. | |
1970 | ||
1971 | */ | |
1972 | ||
975a328e | 1973 | if (ospf->router_id.s_addr == INADDR_ANY) { |
f1cf5af6 | 1974 | if (IS_DEBUG_OSPF_EVENT) |
975a328e DA |
1975 | zlog_debug( |
1976 | "LSA[Type5:%pI4]: deferring AS-external-LSA origination, router ID is zero", | |
1977 | &ei->p.prefix); | |
f1cf5af6 DL |
1978 | return NULL; |
1979 | } | |
1980 | ||
d62a17ae | 1981 | /* Check the AS-external-LSA should be originated. */ |
1982 | if (!ospf_redistribute_check(ospf, ei, NULL)) | |
1983 | return NULL; | |
1984 | ||
1985 | /* Create new AS-external-LSA instance. */ | |
1986 | if ((new = ospf_external_lsa_new(ospf, ei, NULL)) == NULL) { | |
1987 | if (IS_DEBUG_OSPF_EVENT) | |
1988 | zlog_debug( | |
1989 | "LSA[Type5:%s]: Could not originate AS-external-LSA", | |
1990 | inet_ntoa(ei->p.prefix)); | |
1991 | return NULL; | |
1992 | } | |
1993 | ||
1994 | /* Install newly created LSA into Type-5 LSDB, lock = 1. */ | |
1995 | ospf_lsa_install(ospf, NULL, new); | |
1996 | ||
1997 | /* Update LSA origination count. */ | |
1998 | ospf->lsa_originate_count++; | |
1999 | ||
2000 | /* Flooding new LSA. only to AS (non-NSSA/STUB) */ | |
2001 | ospf_flood_through_as(ospf, NULL, new); | |
2002 | ||
2003 | /* If there is any attached NSSA, do special handling */ | |
2004 | if (ospf->anyNSSA && | |
2005 | /* stay away from translated LSAs! */ | |
2006 | !(CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT))) | |
2007 | ospf_install_flood_nssa( | |
2008 | ospf, new, ei); /* Install/Flood Type-7 to all NSSAs */ | |
2009 | ||
2010 | /* Debug logging. */ | |
2011 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
2012 | zlog_debug("LSA[Type%d:%s]: Originate AS-external-LSA %p", | |
2013 | new->data->type, inet_ntoa(new->data->id), | |
2014 | (void *)new); | |
2015 | ospf_lsa_header_dump(new->data); | |
2016 | } | |
2017 | ||
2018 | return new; | |
718e3744 | 2019 | } |
2020 | ||
d62a17ae | 2021 | static struct external_info *ospf_default_external_info(struct ospf *ospf) |
2022 | { | |
2023 | int type; | |
d62a17ae | 2024 | struct prefix_ipv4 p; |
1febb13d S |
2025 | struct external_info *default_ei; |
2026 | int ret = 0; | |
d62a17ae | 2027 | |
2028 | p.family = AF_INET; | |
2029 | p.prefix.s_addr = 0; | |
2030 | p.prefixlen = 0; | |
2031 | ||
1febb13d S |
2032 | default_ei = ospf_external_info_lookup(ospf, DEFAULT_ROUTE, |
2033 | ospf->instance, &p); | |
2034 | if (!default_ei) | |
2035 | return NULL; | |
2036 | ||
d62a17ae | 2037 | /* First, lookup redistributed default route. */ |
2038 | for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) { | |
2039 | struct list *ext_list; | |
d62a17ae | 2040 | |
2041 | if (type == ZEBRA_ROUTE_OSPF) | |
2042 | continue; | |
2043 | ||
de1ac5fd | 2044 | ext_list = ospf->external[type]; |
d62a17ae | 2045 | if (!ext_list) |
2046 | continue; | |
2047 | ||
1febb13d S |
2048 | ret = ospf_external_default_routemap_apply_walk(ospf, ext_list, |
2049 | default_ei); | |
2050 | if (ret) | |
2051 | return default_ei; | |
d62a17ae | 2052 | } |
2053 | ||
2054 | return NULL; | |
2055 | } | |
2056 | ||
fa3c7c7e | 2057 | void ospf_external_lsa_rid_change(struct ospf *ospf) |
d62a17ae | 2058 | { |
d62a17ae | 2059 | struct external_info *ei; |
fa3c7c7e | 2060 | int type; |
d62a17ae | 2061 | |
fa3c7c7e DL |
2062 | for (type = 0; type < ZEBRA_ROUTE_MAX; type++) { |
2063 | struct route_node *rn; | |
2064 | struct route_table *rt; | |
2065 | struct list *ext_list; | |
2066 | struct listnode *node; | |
2067 | struct ospf_external *ext; | |
d62a17ae | 2068 | |
fa3c7c7e DL |
2069 | ext_list = ospf->external[type]; |
2070 | if (!ext_list) | |
2071 | continue; | |
d62a17ae | 2072 | |
fa3c7c7e DL |
2073 | for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) { |
2074 | /* Originate As-external-LSA from all type of | |
2075 | * distribute source. | |
2076 | */ | |
2077 | rt = ext->external_info; | |
2078 | if (!rt) | |
2079 | continue; | |
d62a17ae | 2080 | |
fa3c7c7e DL |
2081 | for (rn = route_top(rt); rn; rn = route_next(rn)) { |
2082 | ei = rn->info; | |
d62a17ae | 2083 | |
fa3c7c7e DL |
2084 | if (!ei) |
2085 | continue; | |
2086 | ||
2087 | if (is_prefix_default( | |
2088 | (struct prefix_ipv4 *)&ei->p)) | |
2089 | continue; | |
2090 | ||
2091 | if (!ospf_external_lsa_originate(ospf, ei)) | |
2092 | flog_warn(EC_OSPF_LSA_INSTALL_FAILURE, | |
2093 | "LSA: AS-external-LSA was not originated."); | |
2094 | } | |
2095 | } | |
2096 | } | |
2097 | ||
2098 | ei = ospf_default_external_info(ospf); | |
2099 | if (ei && !ospf_external_lsa_originate(ospf, ei)) { | |
2100 | flog_warn(EC_OSPF_LSA_INSTALL_FAILURE, | |
2101 | "LSA: AS-external-LSA for default route was not originated."); | |
2102 | } | |
718e3744 | 2103 | } |
2104 | ||
645878f1 | 2105 | /* Flush any NSSA LSAs for given prefix */ |
d62a17ae | 2106 | void ospf_nssa_lsa_flush(struct ospf *ospf, struct prefix_ipv4 *p) |
2107 | { | |
2108 | struct listnode *node, *nnode; | |
b5a8894d | 2109 | struct ospf_lsa *lsa = NULL; |
d62a17ae | 2110 | struct ospf_area *area; |
2111 | ||
2112 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
2113 | if (area->external_routing == OSPF_AREA_NSSA) { | |
996c9314 LB |
2114 | lsa = ospf_lsa_lookup(ospf, area, OSPF_AS_NSSA_LSA, |
2115 | p->prefix, ospf->router_id); | |
b5a8894d | 2116 | if (!lsa) { |
d62a17ae | 2117 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) |
2118 | zlog_debug( | |
2119 | "LSA: There is no such AS-NSSA-LSA %s/%d in LSDB", | |
2120 | inet_ntoa(p->prefix), | |
2121 | p->prefixlen); | |
2122 | continue; | |
2123 | } | |
2124 | ospf_ls_retransmit_delete_nbr_area(area, lsa); | |
2125 | if (!IS_LSA_MAXAGE(lsa)) { | |
2126 | ospf_refresher_unregister_lsa(ospf, lsa); | |
2127 | ospf_lsa_flush_area(lsa, area); | |
2128 | } | |
2129 | } | |
2130 | } | |
645878f1 | 2131 | } |
645878f1 | 2132 | |
718e3744 | 2133 | /* Flush an AS-external-LSA from LSDB and routing domain. */ |
d7c0a89a | 2134 | void ospf_external_lsa_flush(struct ospf *ospf, uint8_t type, |
d62a17ae | 2135 | struct prefix_ipv4 *p, |
2136 | ifindex_t ifindex /*, struct in_addr nexthop */) | |
2137 | { | |
2138 | struct ospf_lsa *lsa; | |
2139 | ||
2140 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2141 | zlog_debug("LSA: Flushing AS-external-LSA %s/%d", | |
2142 | inet_ntoa(p->prefix), p->prefixlen); | |
2143 | ||
2144 | /* First lookup LSA from LSDB. */ | |
2145 | if (!(lsa = ospf_external_info_find_lsa(ospf, p))) { | |
2146 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2147 | zlog_debug( | |
2148 | "LSA: There is no such AS-external-LSA %s/%d in LSDB", | |
2149 | inet_ntoa(p->prefix), p->prefixlen); | |
2150 | return; | |
2151 | } | |
2152 | ||
2153 | /* If LSA is selforiginated, not a translated LSA, and there is | |
2154 | * NSSA area, flush Type-7 LSA's at first. | |
2155 | */ | |
2156 | if (IS_LSA_SELF(lsa) && (ospf->anyNSSA) | |
2157 | && !(CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT))) | |
2158 | ospf_nssa_lsa_flush(ospf, p); | |
2159 | ||
2160 | /* Sweep LSA from Link State Retransmit List. */ | |
2161 | ospf_ls_retransmit_delete_nbr_as(ospf, lsa); | |
2162 | ||
2163 | /* There must be no self-originated LSA in rtrs_external. */ | |
718e3744 | 2164 | #if 0 |
2165 | /* Remove External route from Zebra. */ | |
2166 | ospf_zebra_delete ((struct prefix_ipv4 *) p, &nexthop); | |
2167 | #endif | |
2168 | ||
d62a17ae | 2169 | if (!IS_LSA_MAXAGE(lsa)) { |
2170 | /* Unregister LSA from Refresh queue. */ | |
2171 | ospf_refresher_unregister_lsa(ospf, lsa); | |
2172 | ||
2173 | /* Flush AS-external-LSA through AS. */ | |
2174 | ospf_lsa_flush_as(ospf, lsa); | |
2175 | } | |
2176 | ||
2177 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2178 | zlog_debug("ospf_external_lsa_flush(): stop"); | |
2179 | } | |
2180 | ||
2181 | void ospf_external_lsa_refresh_default(struct ospf *ospf) | |
2182 | { | |
2183 | struct prefix_ipv4 p; | |
2184 | struct external_info *ei; | |
2185 | struct ospf_lsa *lsa; | |
2186 | ||
2187 | p.family = AF_INET; | |
2188 | p.prefixlen = 0; | |
975a328e | 2189 | p.prefix.s_addr = INADDR_ANY; |
d62a17ae | 2190 | |
2191 | ei = ospf_default_external_info(ospf); | |
2192 | lsa = ospf_external_info_find_lsa(ospf, &p); | |
2193 | ||
d5eac1e0 DL |
2194 | if (ei && lsa) { |
2195 | if (IS_DEBUG_OSPF_EVENT) | |
2196 | zlog_debug("LSA[Type5:0.0.0.0]: Refresh AS-external-LSA %p", | |
2197 | (void *)lsa); | |
2198 | ospf_external_lsa_refresh(ospf, lsa, ei, LSA_REFRESH_FORCE); | |
2199 | } else if (ei && !lsa) { | |
2200 | if (IS_DEBUG_OSPF_EVENT) | |
2201 | zlog_debug( | |
2202 | "LSA[Type5:0.0.0.0]: Originate AS-external-LSA"); | |
2203 | ospf_external_lsa_originate(ospf, ei); | |
2204 | } else if (lsa) { | |
2205 | if (IS_DEBUG_OSPF_EVENT) | |
2206 | zlog_debug("LSA[Type5:0.0.0.0]: Flush AS-external-LSA"); | |
2207 | ospf_external_lsa_flush(ospf, DEFAULT_ROUTE, &p, 0); | |
d62a17ae | 2208 | } |
2209 | } | |
2210 | ||
d7c0a89a QY |
2211 | void ospf_external_lsa_refresh_type(struct ospf *ospf, uint8_t type, |
2212 | unsigned short instance, int force) | |
d62a17ae | 2213 | { |
2214 | struct route_node *rn; | |
2215 | struct external_info *ei; | |
2216 | struct ospf_external *ext; | |
2217 | ||
de1ac5fd CS |
2218 | if (type == DEFAULT_ROUTE) |
2219 | return; | |
2220 | ||
2221 | ext = ospf_external_lookup(ospf, type, instance); | |
2222 | ||
2223 | if (ext && EXTERNAL_INFO(ext)) { | |
2224 | /* Refresh each redistributed AS-external-LSAs. */ | |
2225 | for (rn = route_top(EXTERNAL_INFO(ext)); rn; | |
2226 | rn = route_next(rn)) { | |
2227 | ei = rn->info; | |
2228 | if (ei) { | |
2229 | if (!is_prefix_default(&ei->p)) { | |
2230 | struct ospf_lsa *lsa; | |
2231 | ||
996c9314 LB |
2232 | lsa = ospf_external_info_find_lsa( |
2233 | ospf, &ei->p); | |
de1ac5fd | 2234 | if (lsa) |
996c9314 LB |
2235 | ospf_external_lsa_refresh( |
2236 | ospf, lsa, ei, force); | |
de1ac5fd | 2237 | else |
996c9314 LB |
2238 | ospf_external_lsa_originate( |
2239 | ospf, ei); | |
de1ac5fd CS |
2240 | } |
2241 | } | |
2242 | } | |
2243 | } | |
718e3744 | 2244 | } |
2245 | ||
2246 | /* Refresh AS-external-LSA. */ | |
d62a17ae | 2247 | struct ospf_lsa *ospf_external_lsa_refresh(struct ospf *ospf, |
2248 | struct ospf_lsa *lsa, | |
2249 | struct external_info *ei, int force) | |
2250 | { | |
2251 | struct ospf_lsa *new; | |
2252 | int changed; | |
2253 | ||
2254 | /* Check the AS-external-LSA should be originated. */ | |
2255 | if (!ospf_redistribute_check(ospf, ei, &changed)) { | |
2256 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2257 | zlog_debug( | |
3efd0893 | 2258 | "LSA[Type%d:%s]: Could not be refreshed, redist check fail", |
d62a17ae | 2259 | lsa->data->type, inet_ntoa(lsa->data->id)); |
2260 | ospf_external_lsa_flush(ospf, ei->type, &ei->p, | |
2261 | ei->ifindex /*, ei->nexthop */); | |
2262 | return NULL; | |
2263 | } | |
2264 | ||
2265 | if (!changed && !force) { | |
2266 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2267 | zlog_debug( | |
2268 | "LSA[Type%d:%s]: Not refreshed, not changed/forced", | |
2269 | lsa->data->type, inet_ntoa(lsa->data->id)); | |
2270 | return NULL; | |
2271 | } | |
2272 | ||
2273 | /* Delete LSA from neighbor retransmit-list. */ | |
2274 | ospf_ls_retransmit_delete_nbr_as(ospf, lsa); | |
2275 | ||
2276 | /* Unregister AS-external-LSA from refresh-list. */ | |
2277 | ospf_refresher_unregister_lsa(ospf, lsa); | |
2278 | ||
2279 | new = ospf_external_lsa_new(ospf, ei, &lsa->data->id); | |
2280 | ||
2281 | if (new == NULL) { | |
2282 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2283 | zlog_debug("LSA[Type%d:%s]: Could not be refreshed", | |
2284 | lsa->data->type, inet_ntoa(lsa->data->id)); | |
2285 | return NULL; | |
2286 | } | |
2287 | ||
2288 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
2289 | ||
2290 | ospf_lsa_install(ospf, NULL, new); /* As type-5. */ | |
2291 | ||
2292 | /* Flood LSA through AS. */ | |
2293 | ospf_flood_through_as(ospf, NULL, new); | |
2294 | ||
2295 | /* If any attached NSSA, install as Type-7, flood to all NSSA Areas */ | |
2296 | if (ospf->anyNSSA && !(CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT))) | |
2297 | ospf_install_flood_nssa(ospf, new, | |
2298 | ei); /* Install/Flood per new rules */ | |
2299 | ||
2300 | /* Register self-originated LSA to refresh queue. | |
2301 | * Translated LSAs should not be registered, but refreshed upon | |
2302 | * refresh of the Type-7 | |
2303 | */ | |
2304 | if (!CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT)) | |
2305 | ospf_refresher_register_lsa(ospf, new); | |
2306 | ||
2307 | /* Debug logging. */ | |
2308 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
2309 | zlog_debug("LSA[Type%d:%s]: AS-external-LSA refresh", | |
2310 | new->data->type, inet_ntoa(new->data->id)); | |
2311 | ospf_lsa_header_dump(new->data); | |
2312 | } | |
2313 | ||
2314 | return new; | |
718e3744 | 2315 | } |
2316 | ||
6b0655a2 | 2317 | |
718e3744 | 2318 | /* LSA installation functions. */ |
2319 | ||
2320 | /* Install router-LSA to an area. */ | |
4dadc291 | 2321 | static struct ospf_lsa * |
d62a17ae | 2322 | ospf_router_lsa_install(struct ospf *ospf, struct ospf_lsa *new, int rt_recalc) |
718e3744 | 2323 | { |
d62a17ae | 2324 | struct ospf_area *area = new->area; |
718e3744 | 2325 | |
d62a17ae | 2326 | /* RFC 2328 Section 13.2 Router-LSAs and network-LSAs |
2327 | The entire routing table must be recalculated, starting with | |
2328 | the shortest path calculations for each area (not just the | |
2329 | area whose link-state database has changed). | |
2330 | */ | |
718e3744 | 2331 | |
d62a17ae | 2332 | if (IS_LSA_SELF(new)) { |
5996e0df | 2333 | |
d62a17ae | 2334 | /* Only install LSA if it is originated/refreshed by us. |
2335 | * If LSA was received by flooding, the RECEIVED flag is set so | |
2336 | * do | |
2337 | * not link the LSA */ | |
2338 | if (CHECK_FLAG(new->flags, OSPF_LSA_RECEIVED)) | |
2339 | return new; /* ignore stale LSA */ | |
5996e0df | 2340 | |
d62a17ae | 2341 | /* Set self-originated router-LSA. */ |
2342 | ospf_lsa_unlock(&area->router_lsa_self); | |
2343 | area->router_lsa_self = ospf_lsa_lock(new); | |
718e3744 | 2344 | |
d62a17ae | 2345 | ospf_refresher_register_lsa(ospf, new); |
2346 | } | |
2347 | if (rt_recalc) | |
2348 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_ROUTER_LSA_INSTALL); | |
2349 | return new; | |
718e3744 | 2350 | } |
2351 | ||
d62a17ae | 2352 | #define OSPF_INTERFACE_TIMER_ON(T, F, V) \ |
2353 | if (!(T)) \ | |
2354 | (T) = thread_add_timer(master, (F), oi, (V)) | |
718e3744 | 2355 | |
2356 | /* Install network-LSA to an area. */ | |
d62a17ae | 2357 | static struct ospf_lsa *ospf_network_lsa_install(struct ospf *ospf, |
2358 | struct ospf_interface *oi, | |
2359 | struct ospf_lsa *new, | |
2360 | int rt_recalc) | |
2361 | { | |
2362 | ||
2363 | /* RFC 2328 Section 13.2 Router-LSAs and network-LSAs | |
2364 | The entire routing table must be recalculated, starting with | |
2365 | the shortest path calculations for each area (not just the | |
2366 | area whose link-state database has changed). | |
2367 | */ | |
2368 | if (IS_LSA_SELF(new)) { | |
2369 | /* We supposed that when LSA is originated by us, we pass the | |
2370 | int | |
2371 | for which it was originated. If LSA was received by flooding, | |
2372 | the RECEIVED flag is set, so we do not link the LSA to the | |
2373 | int. */ | |
2374 | if (CHECK_FLAG(new->flags, OSPF_LSA_RECEIVED)) | |
2375 | return new; /* ignore stale LSA */ | |
2376 | ||
2377 | ospf_lsa_unlock(&oi->network_lsa_self); | |
2378 | oi->network_lsa_self = ospf_lsa_lock(new); | |
2379 | ospf_refresher_register_lsa(ospf, new); | |
2380 | } | |
2381 | if (rt_recalc) | |
2382 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_NETWORK_LSA_INSTALL); | |
2383 | ||
2384 | return new; | |
718e3744 | 2385 | } |
2386 | ||
2387 | /* Install summary-LSA to an area. */ | |
4dadc291 | 2388 | static struct ospf_lsa * |
d62a17ae | 2389 | ospf_summary_lsa_install(struct ospf *ospf, struct ospf_lsa *new, int rt_recalc) |
2390 | { | |
2391 | if (rt_recalc && !IS_LSA_SELF(new)) { | |
2392 | /* RFC 2328 Section 13.2 Summary-LSAs | |
2393 | The best route to the destination described by the summary- | |
2394 | LSA must be recalculated (see Section 16.5). If this | |
2395 | destination is an AS boundary router, it may also be | |
2396 | necessary to re-examine all the AS-external-LSAs. | |
2397 | */ | |
718e3744 | 2398 | |
2399 | #if 0 | |
2400 | /* This doesn't exist yet... */ | |
2401 | ospf_summary_incremental_update(new); */ | |
996c9314 | 2402 | #else /* #if 0 */ |
d62a17ae | 2403 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_SUMMARY_LSA_INSTALL); |
718e3744 | 2404 | #endif /* #if 0 */ |
d62a17ae | 2405 | } |
718e3744 | 2406 | |
d62a17ae | 2407 | if (IS_LSA_SELF(new)) |
2408 | ospf_refresher_register_lsa(ospf, new); | |
718e3744 | 2409 | |
d62a17ae | 2410 | return new; |
718e3744 | 2411 | } |
2412 | ||
2413 | /* Install ASBR-summary-LSA to an area. */ | |
d62a17ae | 2414 | static struct ospf_lsa *ospf_summary_asbr_lsa_install(struct ospf *ospf, |
2415 | struct ospf_lsa *new, | |
2416 | int rt_recalc) | |
2417 | { | |
2418 | if (rt_recalc && !IS_LSA_SELF(new)) { | |
2419 | /* RFC 2328 Section 13.2 Summary-LSAs | |
2420 | The best route to the destination described by the summary- | |
2421 | LSA must be recalculated (see Section 16.5). If this | |
2422 | destination is an AS boundary router, it may also be | |
2423 | necessary to re-examine all the AS-external-LSAs. | |
2424 | */ | |
718e3744 | 2425 | #if 0 |
2426 | /* These don't exist yet... */ | |
2427 | ospf_summary_incremental_update(new); | |
c258527b | 2428 | /* Isn't this done by the above call? |
718e3744 | 2429 | - RFC 2328 Section 16.5 implies it should be */ |
2430 | /* ospf_ase_calculate_schedule(); */ | |
2431 | #else /* #if 0 */ | |
d62a17ae | 2432 | ospf_spf_calculate_schedule(ospf, |
2433 | SPF_FLAG_ASBR_SUMMARY_LSA_INSTALL); | |
718e3744 | 2434 | #endif /* #if 0 */ |
d62a17ae | 2435 | } |
718e3744 | 2436 | |
d62a17ae | 2437 | /* register LSA to refresh-list. */ |
2438 | if (IS_LSA_SELF(new)) | |
2439 | ospf_refresher_register_lsa(ospf, new); | |
718e3744 | 2440 | |
d62a17ae | 2441 | return new; |
718e3744 | 2442 | } |
2443 | ||
2444 | /* Install AS-external-LSA. */ | |
d62a17ae | 2445 | static struct ospf_lsa *ospf_external_lsa_install(struct ospf *ospf, |
2446 | struct ospf_lsa *new, | |
2447 | int rt_recalc) | |
2448 | { | |
2449 | ospf_ase_register_external_lsa(new, ospf); | |
2450 | /* If LSA is not self-originated, calculate an external route. */ | |
2451 | if (rt_recalc) { | |
2452 | /* RFC 2328 Section 13.2 AS-external-LSAs | |
2453 | The best route to the destination described by the AS- | |
2454 | external-LSA must be recalculated (see Section 16.6). | |
2455 | */ | |
2456 | ||
2457 | if (!IS_LSA_SELF(new)) | |
2458 | ospf_ase_incremental_update(ospf, new); | |
2459 | } | |
2460 | ||
2461 | if (new->data->type == OSPF_AS_NSSA_LSA) { | |
2462 | /* There is no point to register selforiginate Type-7 LSA for | |
2463 | * refreshing. We rely on refreshing Type-5 LSA's | |
2464 | */ | |
2465 | if (IS_LSA_SELF(new)) | |
2466 | return new; | |
2467 | else { | |
2468 | /* Try refresh type-5 translated LSA for this LSA, if | |
2469 | * one exists. | |
2470 | * New translations will be taken care of by the | |
2471 | * abr_task. | |
2472 | */ | |
2473 | ospf_translated_nssa_refresh(ospf, new, NULL); | |
493472ba | 2474 | ospf_schedule_abr_task(ospf); |
d62a17ae | 2475 | } |
2476 | } | |
2477 | ||
2478 | /* Register self-originated LSA to refresh queue. | |
2479 | * Leave Translated LSAs alone if NSSA is enabled | |
2480 | */ | |
2481 | if (IS_LSA_SELF(new) && !CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT)) | |
2482 | ospf_refresher_register_lsa(ospf, new); | |
2483 | ||
2484 | return new; | |
2485 | } | |
2486 | ||
2487 | void ospf_discard_from_db(struct ospf *ospf, struct ospf_lsdb *lsdb, | |
2488 | struct ospf_lsa *lsa) | |
2489 | { | |
2490 | struct ospf_lsa *old; | |
2491 | ||
266469eb | 2492 | if (!lsdb) |
d62a17ae | 2493 | return; |
d62a17ae | 2494 | |
2495 | old = ospf_lsdb_lookup(lsdb, lsa); | |
2496 | ||
2497 | if (!old) | |
2498 | return; | |
2499 | ||
2500 | if (old->refresh_list >= 0) | |
2501 | ospf_refresher_unregister_lsa(ospf, old); | |
2502 | ||
2503 | switch (old->data->type) { | |
2504 | case OSPF_AS_EXTERNAL_LSA: | |
2505 | ospf_ase_unregister_external_lsa(old, ospf); | |
2506 | ospf_ls_retransmit_delete_nbr_as(ospf, old); | |
2507 | break; | |
2508 | case OSPF_OPAQUE_AS_LSA: | |
2509 | ospf_ls_retransmit_delete_nbr_as(ospf, old); | |
2510 | break; | |
2511 | case OSPF_AS_NSSA_LSA: | |
2512 | ospf_ls_retransmit_delete_nbr_area(old->area, old); | |
2513 | ospf_ase_unregister_external_lsa(old, ospf); | |
2514 | break; | |
2515 | default: | |
2516 | ospf_ls_retransmit_delete_nbr_area(old->area, old); | |
2517 | break; | |
2518 | } | |
2519 | ||
2520 | ospf_lsa_maxage_delete(ospf, old); | |
2521 | ospf_lsa_discard(old); | |
2522 | } | |
2523 | ||
2524 | struct ospf_lsa *ospf_lsa_install(struct ospf *ospf, struct ospf_interface *oi, | |
2525 | struct ospf_lsa *lsa) | |
2526 | { | |
2527 | struct ospf_lsa *new = NULL; | |
2528 | struct ospf_lsa *old = NULL; | |
2529 | struct ospf_lsdb *lsdb = NULL; | |
2530 | int rt_recalc; | |
2531 | ||
2532 | /* Set LSDB. */ | |
2533 | switch (lsa->data->type) { | |
2534 | /* kevinm */ | |
2535 | case OSPF_AS_NSSA_LSA: | |
2536 | if (lsa->area) | |
2537 | lsdb = lsa->area->lsdb; | |
2538 | else | |
2539 | lsdb = ospf->lsdb; | |
2540 | break; | |
2541 | case OSPF_AS_EXTERNAL_LSA: | |
2542 | case OSPF_OPAQUE_AS_LSA: | |
2543 | lsdb = ospf->lsdb; | |
2544 | break; | |
2545 | default: | |
a37befa7 | 2546 | if (lsa->area) |
2547 | lsdb = lsa->area->lsdb; | |
d62a17ae | 2548 | break; |
2549 | } | |
2550 | ||
2551 | assert(lsdb); | |
2552 | ||
2553 | /* RFC 2328 13.2. Installing LSAs in the database | |
2554 | ||
2555 | Installing a new LSA in the database, either as the result of | |
2556 | flooding or a newly self-originated LSA, may cause the OSPF | |
2557 | routing table structure to be recalculated. The contents of the | |
2558 | new LSA should be compared to the old instance, if present. If | |
2559 | there is no difference, there is no need to recalculate the | |
2560 | routing table. When comparing an LSA to its previous instance, | |
2561 | the following are all considered to be differences in contents: | |
2562 | ||
2563 | o The LSA's Options field has changed. | |
2564 | ||
2565 | o One of the LSA instances has LS age set to MaxAge, and | |
2566 | the other does not. | |
2567 | ||
2568 | o The length field in the LSA header has changed. | |
2569 | ||
2570 | o The body of the LSA (i.e., anything outside the 20-byte | |
2571 | LSA header) has changed. Note that this excludes changes | |
2572 | in LS Sequence Number and LS Checksum. | |
2573 | ||
2574 | */ | |
2575 | /* Look up old LSA and determine if any SPF calculation or incremental | |
2576 | update is needed */ | |
2577 | old = ospf_lsdb_lookup(lsdb, lsa); | |
2578 | ||
2579 | /* Do comparision and record if recalc needed. */ | |
2580 | rt_recalc = 0; | |
2581 | if (old == NULL || ospf_lsa_different(old, lsa)) | |
2582 | rt_recalc = 1; | |
2583 | ||
2584 | /* | |
2585 | Sequence number check (Section 14.1 of rfc 2328) | |
2586 | "Premature aging is used when it is time for a self-originated | |
2587 | LSA's sequence number field to wrap. At this point, the current | |
2588 | LSA instance (having LS sequence number MaxSequenceNumber) must | |
2589 | be prematurely aged and flushed from the routing domain before a | |
2590 | new instance with sequence number equal to InitialSequenceNumber | |
2591 | can be originated. " | |
2592 | */ | |
2593 | ||
2594 | if (ntohl(lsa->data->ls_seqnum) - 1 == OSPF_MAX_SEQUENCE_NUMBER) { | |
2595 | if (ospf_lsa_is_self_originated(ospf, lsa)) { | |
2596 | lsa->data->ls_seqnum = htonl(OSPF_MAX_SEQUENCE_NUMBER); | |
2597 | ||
2598 | if (!IS_LSA_MAXAGE(lsa)) | |
2599 | lsa->flags |= OSPF_LSA_PREMATURE_AGE; | |
2600 | lsa->data->ls_age = htons(OSPF_LSA_MAXAGE); | |
2601 | ||
2602 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) { | |
2603 | zlog_debug( | |
3efd0893 | 2604 | "ospf_lsa_install() Premature Aging lsa 0x%p, seqnum 0x%x", |
d62a17ae | 2605 | (void *)lsa, |
2606 | ntohl(lsa->data->ls_seqnum)); | |
2607 | ospf_lsa_header_dump(lsa->data); | |
2608 | } | |
2609 | } else { | |
2610 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
2611 | zlog_debug( | |
3efd0893 | 2612 | "ospf_lsa_install() got an lsa with seq 0x80000000 that was not self originated. Ignoring\n"); |
d62a17ae | 2613 | ospf_lsa_header_dump(lsa->data); |
2614 | } | |
2615 | return old; | |
2616 | } | |
2617 | } | |
2618 | ||
2619 | /* discard old LSA from LSDB */ | |
2620 | if (old != NULL) | |
2621 | ospf_discard_from_db(ospf, lsdb, lsa); | |
2622 | ||
2623 | /* Calculate Checksum if self-originated?. */ | |
2624 | if (IS_LSA_SELF(lsa)) | |
2625 | ospf_lsa_checksum(lsa->data); | |
2626 | ||
2627 | /* Insert LSA to LSDB. */ | |
2628 | ospf_lsdb_add(lsdb, lsa); | |
2629 | lsa->lsdb = lsdb; | |
2630 | ||
2631 | /* Do LSA specific installation process. */ | |
2632 | switch (lsa->data->type) { | |
2633 | case OSPF_ROUTER_LSA: | |
2634 | new = ospf_router_lsa_install(ospf, lsa, rt_recalc); | |
2635 | break; | |
2636 | case OSPF_NETWORK_LSA: | |
2637 | assert(oi); | |
2638 | new = ospf_network_lsa_install(ospf, oi, lsa, rt_recalc); | |
2639 | break; | |
2640 | case OSPF_SUMMARY_LSA: | |
2641 | new = ospf_summary_lsa_install(ospf, lsa, rt_recalc); | |
2642 | break; | |
2643 | case OSPF_ASBR_SUMMARY_LSA: | |
2644 | new = ospf_summary_asbr_lsa_install(ospf, lsa, rt_recalc); | |
2645 | break; | |
2646 | case OSPF_AS_EXTERNAL_LSA: | |
2647 | new = ospf_external_lsa_install(ospf, lsa, rt_recalc); | |
2648 | break; | |
2649 | case OSPF_OPAQUE_LINK_LSA: | |
2650 | if (IS_LSA_SELF(lsa)) | |
2651 | lsa->oi = oi; /* Specify outgoing ospf-interface for | |
2652 | this LSA. */ | |
2653 | else { | |
2654 | /* Incoming "oi" for this LSA has set at LSUpd | |
2655 | * reception. */ | |
2656 | } | |
2657 | /* Fallthrough */ | |
2658 | case OSPF_OPAQUE_AREA_LSA: | |
2659 | case OSPF_OPAQUE_AS_LSA: | |
2660 | new = ospf_opaque_lsa_install(lsa, rt_recalc); | |
2661 | break; | |
2662 | case OSPF_AS_NSSA_LSA: | |
2663 | new = ospf_external_lsa_install(ospf, lsa, rt_recalc); | |
2664 | default: /* type-6,8,9....nothing special */ | |
2665 | break; | |
2666 | } | |
2667 | ||
2668 | if (new == NULL) | |
2669 | return new; /* Installation failed, cannot proceed further -- | |
2670 | endo. */ | |
2671 | ||
2672 | /* Debug logs. */ | |
2673 | if (IS_DEBUG_OSPF(lsa, LSA_INSTALL)) { | |
2674 | char area_str[INET_ADDRSTRLEN]; | |
2675 | ||
2676 | switch (lsa->data->type) { | |
2677 | case OSPF_AS_EXTERNAL_LSA: | |
2678 | case OSPF_OPAQUE_AS_LSA: | |
2679 | case OSPF_AS_NSSA_LSA: | |
2680 | zlog_debug("LSA[%s]: Install %s", dump_lsa_key(new), | |
2681 | lookup_msg(ospf_lsa_type_msg, | |
2682 | new->data->type, NULL)); | |
2683 | break; | |
2684 | default: | |
a1d6bbb1 RW |
2685 | strlcpy(area_str, inet_ntoa(new->area->area_id), |
2686 | sizeof(area_str)); | |
d62a17ae | 2687 | zlog_debug("LSA[%s]: Install %s to Area %s", |
2688 | dump_lsa_key(new), | |
2689 | lookup_msg(ospf_lsa_type_msg, | |
2690 | new->data->type, NULL), | |
2691 | area_str); | |
2692 | break; | |
2693 | } | |
2694 | } | |
2695 | ||
2696 | /* | |
2697 | If received LSA' ls_age is MaxAge, or lsa is being prematurely aged | |
2698 | (it's getting flushed out of the area), set LSA on MaxAge LSA list. | |
2699 | */ | |
2700 | if (IS_LSA_MAXAGE(new)) { | |
2701 | if (IS_DEBUG_OSPF(lsa, LSA_INSTALL)) | |
2702 | zlog_debug("LSA[Type%d:%s]: Install LSA 0x%p, MaxAge", | |
2703 | new->data->type, inet_ntoa(new->data->id), | |
2704 | (void *)lsa); | |
2705 | ospf_lsa_maxage(ospf, lsa); | |
2706 | } | |
2707 | ||
2708 | return new; | |
2709 | } | |
2710 | ||
2711 | ||
2712 | int ospf_check_nbr_status(struct ospf *ospf) | |
2713 | { | |
2714 | struct listnode *node, *nnode; | |
2715 | struct ospf_interface *oi; | |
2716 | ||
2717 | for (ALL_LIST_ELEMENTS(ospf->oiflist, node, nnode, oi)) { | |
2718 | struct route_node *rn; | |
2719 | struct ospf_neighbor *nbr; | |
2720 | ||
2721 | if (ospf_if_is_enable(oi)) | |
2722 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
2723 | if ((nbr = rn->info) != NULL) | |
2724 | if (nbr->state == NSM_Exchange | |
2725 | || nbr->state == NSM_Loading) { | |
2726 | route_unlock_node(rn); | |
2727 | return 0; | |
2728 | } | |
2729 | } | |
2730 | ||
2731 | return 1; | |
2732 | } | |
2733 | ||
2734 | ||
2735 | static int ospf_maxage_lsa_remover(struct thread *thread) | |
2736 | { | |
2737 | struct ospf *ospf = THREAD_ARG(thread); | |
2738 | struct ospf_lsa *lsa; | |
2739 | struct route_node *rn; | |
2740 | int reschedule = 0; | |
2741 | ||
2742 | ospf->t_maxage = NULL; | |
2743 | ||
2744 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2745 | zlog_debug("LSA[MaxAge]: remover Start"); | |
2746 | ||
2747 | reschedule = !ospf_check_nbr_status(ospf); | |
2748 | ||
2749 | if (!reschedule) | |
2750 | for (rn = route_top(ospf->maxage_lsa); rn; | |
2751 | rn = route_next(rn)) { | |
2752 | if ((lsa = rn->info) == NULL) { | |
2753 | continue; | |
2754 | } | |
2755 | ||
2756 | /* There is at least one neighbor from which we still | |
2757 | * await an ack | |
2758 | * for that LSA, so we are not allowed to remove it from | |
2759 | * our lsdb yet | |
2760 | * as per RFC 2328 section 14 para 4 a) */ | |
2761 | if (lsa->retransmit_counter > 0) { | |
2762 | reschedule = 1; | |
2763 | continue; | |
2764 | } | |
2765 | ||
2766 | /* TODO: maybe convert this function to a work-queue */ | |
2767 | if (thread_should_yield(thread)) { | |
2768 | OSPF_TIMER_ON(ospf->t_maxage, | |
2769 | ospf_maxage_lsa_remover, 0); | |
2770 | route_unlock_node( | |
2771 | rn); /* route_top/route_next */ | |
2772 | return 0; | |
2773 | } | |
2774 | ||
2775 | /* Remove LSA from the LSDB */ | |
2776 | if (IS_LSA_SELF(lsa)) | |
2777 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2778 | zlog_debug( | |
2779 | "LSA[Type%d:%s]: LSA 0x%lx is self-originated: ", | |
2780 | lsa->data->type, | |
2781 | inet_ntoa(lsa->data->id), | |
d7c0a89a | 2782 | (unsigned long)lsa); |
d62a17ae | 2783 | |
2784 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2785 | zlog_debug( | |
2786 | "LSA[Type%d:%s]: MaxAge LSA removed from list", | |
2787 | lsa->data->type, | |
2788 | inet_ntoa(lsa->data->id)); | |
2789 | ||
2790 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_PREMATURE_AGE)) { | |
2791 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2792 | zlog_debug( | |
63efca0e | 2793 | "originating new lsa for lsa 0x%p", |
d62a17ae | 2794 | (void *)lsa); |
2795 | ospf_lsa_refresh(ospf, lsa); | |
2796 | } | |
2797 | ||
2798 | /* Remove from lsdb. */ | |
2799 | if (lsa->lsdb) { | |
2800 | ospf_discard_from_db(ospf, lsa->lsdb, lsa); | |
2801 | ospf_lsdb_delete(lsa->lsdb, lsa); | |
13ab4921 DS |
2802 | } else { |
2803 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2804 | zlog_debug( | |
2805 | "%s: LSA[Type%d:%s]: No associated LSDB!", | |
2806 | __func__, lsa->data->type, | |
2807 | inet_ntoa(lsa->data->id)); | |
2808 | } | |
d62a17ae | 2809 | } |
2810 | ||
2811 | /* A MaxAge LSA must be removed immediately from the router's link | |
2812 | state database as soon as both a) it is no longer contained on any | |
2813 | neighbor Link state retransmission lists and b) none of the | |
2814 | router's | |
2815 | neighbors are in states Exchange or Loading. */ | |
2816 | if (reschedule) | |
2817 | OSPF_TIMER_ON(ospf->t_maxage, ospf_maxage_lsa_remover, | |
2818 | ospf->maxage_delay); | |
2819 | ||
2820 | return 0; | |
2821 | } | |
2822 | ||
2823 | void ospf_lsa_maxage_delete(struct ospf *ospf, struct ospf_lsa *lsa) | |
2824 | { | |
2825 | struct route_node *rn; | |
dcc3ef87 | 2826 | struct prefix lsa_prefix; |
d62a17ae | 2827 | |
dcc3ef87 | 2828 | memset(&lsa_prefix, 0, sizeof(struct prefix)); |
d62a17ae | 2829 | lsa_prefix.family = 0; |
dcc3ef87 CS |
2830 | lsa_prefix.prefixlen = sizeof(lsa_prefix.u.ptr) * CHAR_BIT; |
2831 | lsa_prefix.u.ptr = (uintptr_t)lsa; | |
d62a17ae | 2832 | |
c4efd0f4 | 2833 | if ((rn = route_node_lookup(ospf->maxage_lsa, &lsa_prefix))) { |
d62a17ae | 2834 | if (rn->info == lsa) { |
2835 | UNSET_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE); | |
2836 | ospf_lsa_unlock(&lsa); /* maxage_lsa */ | |
2837 | rn->info = NULL; | |
2838 | route_unlock_node( | |
2839 | rn); /* unlock node because lsa is deleted */ | |
2840 | } | |
2841 | route_unlock_node(rn); /* route_node_lookup */ | |
dcc3ef87 CS |
2842 | } else { |
2843 | if (IS_DEBUG_OSPF_EVENT) | |
2844 | zlog_debug("%s: lsa %s is not found in maxage db.", | |
15569c58 | 2845 | __func__, dump_lsa_key(lsa)); |
d62a17ae | 2846 | } |
718e3744 | 2847 | } |
2848 | ||
02d942c9 PJ |
2849 | /* Add LSA onto the MaxAge list, and schedule for removal. |
2850 | * This does *not* lead to the LSA being flooded, that must be taken | |
2851 | * care of elsewhere, see, e.g., ospf_lsa_flush* (which are callers of this | |
2852 | * function). | |
2853 | */ | |
d62a17ae | 2854 | void ospf_lsa_maxage(struct ospf *ospf, struct ospf_lsa *lsa) |
2855 | { | |
dcc3ef87 | 2856 | struct prefix lsa_prefix; |
d62a17ae | 2857 | struct route_node *rn; |
2858 | ||
2859 | /* When we saw a MaxAge LSA flooded to us, we put it on the list | |
2860 | and schedule the MaxAge LSA remover. */ | |
2861 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE)) { | |
2862 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2863 | zlog_debug( | |
2864 | "LSA[Type%d:%s]: %p already exists on MaxAge LSA list", | |
2865 | lsa->data->type, inet_ntoa(lsa->data->id), | |
2866 | (void *)lsa); | |
2867 | return; | |
2868 | } | |
2869 | ||
dcc3ef87 | 2870 | memset(&lsa_prefix, 0, sizeof(struct prefix)); |
d62a17ae | 2871 | lsa_prefix.family = 0; |
dcc3ef87 CS |
2872 | lsa_prefix.prefixlen = sizeof(lsa_prefix.u.ptr) * CHAR_BIT; |
2873 | lsa_prefix.u.ptr = (uintptr_t)lsa; | |
d62a17ae | 2874 | |
c4efd0f4 | 2875 | rn = route_node_get(ospf->maxage_lsa, &lsa_prefix); |
0ce1ca80 DS |
2876 | if (rn->info != NULL) { |
2877 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2878 | zlog_debug( | |
2879 | "LSA[%s]: found LSA (%p) in table for LSA %p %d", | |
2880 | dump_lsa_key(lsa), rn->info, | |
2881 | (void *)lsa, lsa_prefix.prefixlen); | |
2882 | route_unlock_node(rn); | |
d62a17ae | 2883 | } else { |
0ce1ca80 DS |
2884 | rn->info = ospf_lsa_lock(lsa); |
2885 | SET_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE); | |
d62a17ae | 2886 | } |
2887 | ||
2888 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2889 | zlog_debug("LSA[%s]: MaxAge LSA remover scheduled.", | |
2890 | dump_lsa_key(lsa)); | |
2891 | ||
2892 | OSPF_TIMER_ON(ospf->t_maxage, ospf_maxage_lsa_remover, | |
2893 | ospf->maxage_delay); | |
2894 | } | |
2895 | ||
2896 | static int ospf_lsa_maxage_walker_remover(struct ospf *ospf, | |
2897 | struct ospf_lsa *lsa) | |
2898 | { | |
2899 | /* Stay away from any Local Translated Type-7 LSAs */ | |
2900 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
2901 | return 0; | |
2902 | ||
2903 | if (IS_LSA_MAXAGE(lsa)) | |
2904 | /* Self-originated LSAs should NOT time-out instead, | |
2905 | they're flushed and submitted to the max_age list explicitly. | |
2906 | */ | |
2907 | if (!ospf_lsa_is_self_originated(ospf, lsa)) { | |
2908 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2909 | zlog_debug("LSA[%s]: is MaxAge", | |
2910 | dump_lsa_key(lsa)); | |
2911 | ||
2912 | switch (lsa->data->type) { | |
2913 | case OSPF_OPAQUE_LINK_LSA: | |
2914 | case OSPF_OPAQUE_AREA_LSA: | |
2915 | case OSPF_OPAQUE_AS_LSA: | |
2916 | /* | |
2917 | * As a general rule, whenever network topology | |
2918 | * has changed | |
2919 | * (due to an LSA removal in this case), routing | |
2920 | * recalculation | |
2921 | * should be triggered. However, this is not | |
2922 | * true for opaque | |
2923 | * LSAs. Even if an opaque LSA instance is going | |
2924 | * to be removed | |
2925 | * from the routing domain, it does not mean a | |
2926 | * change in network | |
2927 | * topology, and thus, routing recalculation is | |
2928 | * not needed here. | |
2929 | */ | |
2930 | break; | |
2931 | case OSPF_AS_EXTERNAL_LSA: | |
2932 | case OSPF_AS_NSSA_LSA: | |
2933 | ospf_ase_incremental_update(ospf, lsa); | |
2934 | break; | |
2935 | default: | |
2936 | ospf_spf_calculate_schedule(ospf, | |
2937 | SPF_FLAG_MAXAGE); | |
2938 | break; | |
2939 | } | |
2940 | ospf_lsa_maxage(ospf, lsa); | |
2941 | } | |
2942 | ||
2943 | if (IS_LSA_MAXAGE(lsa) && !ospf_lsa_is_self_originated(ospf, lsa)) | |
2944 | if (LS_AGE(lsa) > OSPF_LSA_MAXAGE + 30) | |
2945 | printf("Eek! Shouldn't happen!\n"); | |
2946 | ||
2947 | return 0; | |
718e3744 | 2948 | } |
2949 | ||
2950 | /* Periodical check of MaxAge LSA. */ | |
d62a17ae | 2951 | int ospf_lsa_maxage_walker(struct thread *thread) |
2952 | { | |
2953 | struct ospf *ospf = THREAD_ARG(thread); | |
2954 | struct route_node *rn; | |
2955 | struct ospf_lsa *lsa; | |
2956 | struct ospf_area *area; | |
2957 | struct listnode *node, *nnode; | |
2958 | ||
2959 | ospf->t_maxage_walker = NULL; | |
2960 | ||
2961 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
996c9314 | 2962 | LSDB_LOOP (ROUTER_LSDB(area), rn, lsa) |
044506e7 | 2963 | ospf_lsa_maxage_walker_remover(ospf, lsa); |
996c9314 | 2964 | LSDB_LOOP (NETWORK_LSDB(area), rn, lsa) |
044506e7 | 2965 | ospf_lsa_maxage_walker_remover(ospf, lsa); |
996c9314 | 2966 | LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa) |
044506e7 | 2967 | ospf_lsa_maxage_walker_remover(ospf, lsa); |
996c9314 | 2968 | LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa) |
044506e7 | 2969 | ospf_lsa_maxage_walker_remover(ospf, lsa); |
996c9314 | 2970 | LSDB_LOOP (OPAQUE_AREA_LSDB(area), rn, lsa) |
044506e7 | 2971 | ospf_lsa_maxage_walker_remover(ospf, lsa); |
996c9314 | 2972 | LSDB_LOOP (OPAQUE_LINK_LSDB(area), rn, lsa) |
044506e7 | 2973 | ospf_lsa_maxage_walker_remover(ospf, lsa); |
996c9314 | 2974 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) |
044506e7 | 2975 | ospf_lsa_maxage_walker_remover(ospf, lsa); |
d62a17ae | 2976 | } |
2977 | ||
2978 | /* for AS-external-LSAs. */ | |
2979 | if (ospf->lsdb) { | |
996c9314 | 2980 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) |
044506e7 | 2981 | ospf_lsa_maxage_walker_remover(ospf, lsa); |
996c9314 | 2982 | LSDB_LOOP (OPAQUE_AS_LSDB(ospf), rn, lsa) |
044506e7 | 2983 | ospf_lsa_maxage_walker_remover(ospf, lsa); |
d62a17ae | 2984 | } |
2985 | ||
2986 | OSPF_TIMER_ON(ospf->t_maxage_walker, ospf_lsa_maxage_walker, | |
2987 | OSPF_LSA_MAXAGE_CHECK_INTERVAL); | |
2988 | return 0; | |
2989 | } | |
2990 | ||
d7c0a89a | 2991 | struct ospf_lsa *ospf_lsa_lookup_by_prefix(struct ospf_lsdb *lsdb, uint8_t type, |
d62a17ae | 2992 | struct prefix_ipv4 *p, |
2993 | struct in_addr router_id) | |
2994 | { | |
2995 | struct ospf_lsa *lsa; | |
2996 | struct in_addr mask, id; | |
2997 | struct lsa_header_mask { | |
2998 | struct lsa_header header; | |
2999 | struct in_addr mask; | |
3000 | } * hmask; | |
3001 | ||
3002 | lsa = ospf_lsdb_lookup_by_id(lsdb, type, p->prefix, router_id); | |
3003 | if (lsa == NULL) | |
3004 | return NULL; | |
3005 | ||
3006 | masklen2ip(p->prefixlen, &mask); | |
3007 | ||
3008 | hmask = (struct lsa_header_mask *)lsa->data; | |
3009 | ||
3010 | if (mask.s_addr != hmask->mask.s_addr) { | |
3011 | id.s_addr = p->prefix.s_addr | (~mask.s_addr); | |
3012 | lsa = ospf_lsdb_lookup_by_id(lsdb, type, id, router_id); | |
3013 | if (!lsa) | |
3014 | return NULL; | |
3015 | } | |
3016 | ||
3017 | return lsa; | |
3018 | } | |
3019 | ||
b5a8894d | 3020 | struct ospf_lsa *ospf_lsa_lookup(struct ospf *ospf, struct ospf_area *area, |
d7c0a89a | 3021 | uint32_t type, struct in_addr id, |
b5a8894d | 3022 | struct in_addr adv_router) |
d62a17ae | 3023 | { |
b5a8894d CS |
3024 | if (!ospf) |
3025 | return NULL; | |
d62a17ae | 3026 | |
3027 | switch (type) { | |
3028 | case OSPF_ROUTER_LSA: | |
3029 | case OSPF_NETWORK_LSA: | |
3030 | case OSPF_SUMMARY_LSA: | |
3031 | case OSPF_ASBR_SUMMARY_LSA: | |
3032 | case OSPF_AS_NSSA_LSA: | |
3033 | case OSPF_OPAQUE_LINK_LSA: | |
3034 | case OSPF_OPAQUE_AREA_LSA: | |
3035 | return ospf_lsdb_lookup_by_id(area->lsdb, type, id, adv_router); | |
3036 | case OSPF_AS_EXTERNAL_LSA: | |
3037 | case OSPF_OPAQUE_AS_LSA: | |
3038 | return ospf_lsdb_lookup_by_id(ospf->lsdb, type, id, adv_router); | |
3039 | default: | |
3040 | break; | |
3041 | } | |
3042 | ||
3043 | return NULL; | |
3044 | } | |
3045 | ||
d7c0a89a | 3046 | struct ospf_lsa *ospf_lsa_lookup_by_id(struct ospf_area *area, uint32_t type, |
d62a17ae | 3047 | struct in_addr id) |
3048 | { | |
3049 | struct ospf_lsa *lsa; | |
3050 | struct route_node *rn; | |
3051 | ||
3052 | switch (type) { | |
3053 | case OSPF_ROUTER_LSA: | |
3054 | return ospf_lsdb_lookup_by_id(area->lsdb, type, id, id); | |
3055 | case OSPF_NETWORK_LSA: | |
3056 | for (rn = route_top(NETWORK_LSDB(area)); rn; | |
3057 | rn = route_next(rn)) | |
3058 | if ((lsa = rn->info)) | |
3059 | if (IPV4_ADDR_SAME(&lsa->data->id, &id)) { | |
3060 | route_unlock_node(rn); | |
3061 | return lsa; | |
3062 | } | |
3063 | break; | |
3064 | case OSPF_SUMMARY_LSA: | |
3065 | case OSPF_ASBR_SUMMARY_LSA: | |
3066 | /* Currently not used. */ | |
3067 | assert(1); | |
3068 | return ospf_lsdb_lookup_by_id(area->lsdb, type, id, id); | |
3069 | case OSPF_AS_EXTERNAL_LSA: | |
3070 | case OSPF_AS_NSSA_LSA: | |
3071 | case OSPF_OPAQUE_LINK_LSA: | |
3072 | case OSPF_OPAQUE_AREA_LSA: | |
3073 | case OSPF_OPAQUE_AS_LSA: | |
3074 | /* Currently not used. */ | |
3075 | break; | |
3076 | default: | |
3077 | break; | |
3078 | } | |
3079 | ||
3080 | return NULL; | |
3081 | } | |
3082 | ||
3083 | struct ospf_lsa *ospf_lsa_lookup_by_header(struct ospf_area *area, | |
3084 | struct lsa_header *lsah) | |
3085 | { | |
3086 | struct ospf_lsa *match; | |
3087 | ||
3088 | /* | |
3089 | * Strictly speaking, the LSA-ID field for Opaque-LSAs (type-9/10/11) | |
3090 | * is redefined to have two subfields; opaque-type and opaque-id. | |
3091 | * However, it is harmless to treat the two sub fields together, as if | |
3092 | * they two were forming a unique LSA-ID. | |
3093 | */ | |
3094 | ||
b5a8894d CS |
3095 | match = ospf_lsa_lookup(area->ospf, area, lsah->type, lsah->id, |
3096 | lsah->adv_router); | |
d62a17ae | 3097 | |
3098 | if (match == NULL) | |
3099 | if (IS_DEBUG_OSPF(lsa, LSA) == OSPF_DEBUG_LSA) | |
3100 | zlog_debug("LSA[Type%d:%s]: Lookup by header, NO MATCH", | |
3101 | lsah->type, inet_ntoa(lsah->id)); | |
3102 | ||
3103 | return match; | |
718e3744 | 3104 | } |
3105 | ||
3106 | /* return +n, l1 is more recent. | |
3107 | return -n, l2 is more recent. | |
3108 | return 0, l1 and l2 is identical. */ | |
d62a17ae | 3109 | int ospf_lsa_more_recent(struct ospf_lsa *l1, struct ospf_lsa *l2) |
3110 | { | |
3111 | int r; | |
3112 | int x, y; | |
3113 | ||
3114 | if (l1 == NULL && l2 == NULL) | |
3115 | return 0; | |
3116 | if (l1 == NULL) | |
3117 | return -1; | |
3118 | if (l2 == NULL) | |
3119 | return 1; | |
3120 | ||
3121 | /* compare LS sequence number. */ | |
3122 | x = (int)ntohl(l1->data->ls_seqnum); | |
3123 | y = (int)ntohl(l2->data->ls_seqnum); | |
3124 | if (x > y) | |
3125 | return 1; | |
3126 | if (x < y) | |
3127 | return -1; | |
3128 | ||
3129 | /* compare LS checksum. */ | |
3130 | r = ntohs(l1->data->checksum) - ntohs(l2->data->checksum); | |
3131 | if (r) | |
3132 | return r; | |
3133 | ||
3134 | /* compare LS age. */ | |
3135 | if (IS_LSA_MAXAGE(l1) && !IS_LSA_MAXAGE(l2)) | |
3136 | return 1; | |
3137 | else if (!IS_LSA_MAXAGE(l1) && IS_LSA_MAXAGE(l2)) | |
3138 | return -1; | |
3139 | ||
3140 | /* compare LS age with MaxAgeDiff. */ | |
3141 | if (LS_AGE(l1) - LS_AGE(l2) > OSPF_LSA_MAXAGE_DIFF) | |
3142 | return -1; | |
3143 | else if (LS_AGE(l2) - LS_AGE(l1) > OSPF_LSA_MAXAGE_DIFF) | |
3144 | return 1; | |
3145 | ||
3146 | /* LSAs are identical. */ | |
3147 | return 0; | |
718e3744 | 3148 | } |
3149 | ||
3150 | /* If two LSAs are different, return 1, otherwise return 0. */ | |
d62a17ae | 3151 | int ospf_lsa_different(struct ospf_lsa *l1, struct ospf_lsa *l2) |
718e3744 | 3152 | { |
d62a17ae | 3153 | char *p1, *p2; |
3154 | assert(l1); | |
3155 | assert(l2); | |
3156 | assert(l1->data); | |
3157 | assert(l2->data); | |
718e3744 | 3158 | |
d62a17ae | 3159 | if (l1->data->options != l2->data->options) |
3160 | return 1; | |
718e3744 | 3161 | |
d62a17ae | 3162 | if (IS_LSA_MAXAGE(l1) && !IS_LSA_MAXAGE(l2)) |
3163 | return 1; | |
718e3744 | 3164 | |
d62a17ae | 3165 | if (IS_LSA_MAXAGE(l2) && !IS_LSA_MAXAGE(l1)) |
3166 | return 1; | |
718e3744 | 3167 | |
d62a17ae | 3168 | if (l1->data->length != l2->data->length) |
3169 | return 1; | |
718e3744 | 3170 | |
d62a17ae | 3171 | if (l1->data->length == 0) |
3172 | return 1; | |
718e3744 | 3173 | |
d62a17ae | 3174 | if (CHECK_FLAG((l1->flags ^ l2->flags), OSPF_LSA_RECEIVED)) |
3175 | return 1; /* May be a stale LSA in the LSBD */ | |
5996e0df | 3176 | |
d62a17ae | 3177 | assert(ntohs(l1->data->length) > OSPF_LSA_HEADER_SIZE); |
718e3744 | 3178 | |
d62a17ae | 3179 | p1 = (char *)l1->data; |
3180 | p2 = (char *)l2->data; | |
718e3744 | 3181 | |
d62a17ae | 3182 | if (memcmp(p1 + OSPF_LSA_HEADER_SIZE, p2 + OSPF_LSA_HEADER_SIZE, |
3183 | ntohs(l1->data->length) - OSPF_LSA_HEADER_SIZE) | |
3184 | != 0) | |
3185 | return 1; | |
718e3744 | 3186 | |
d62a17ae | 3187 | return 0; |
718e3744 | 3188 | } |
3189 | ||
d62a17ae | 3190 | int ospf_lsa_flush_schedule(struct ospf *ospf, struct ospf_lsa *lsa) |
3191 | { | |
3192 | if (lsa == NULL || !IS_LSA_SELF(lsa)) | |
3193 | return 0; | |
3194 | ||
3195 | if (IS_DEBUG_OSPF_EVENT) | |
3196 | zlog_debug( | |
3197 | "LSA[Type%d:%s]: Schedule self-originated LSA to FLUSH", | |
3198 | lsa->data->type, inet_ntoa(lsa->data->id)); | |
3199 | ||
3200 | /* Force given lsa's age to MaxAge. */ | |
3201 | lsa->data->ls_age = htons(OSPF_LSA_MAXAGE); | |
3202 | ||
3203 | switch (lsa->data->type) { | |
3204 | /* Opaque wants to be notified of flushes */ | |
3205 | case OSPF_OPAQUE_LINK_LSA: | |
3206 | case OSPF_OPAQUE_AREA_LSA: | |
3207 | case OSPF_OPAQUE_AS_LSA: | |
3208 | ospf_opaque_lsa_refresh(lsa); | |
3209 | break; | |
3210 | default: | |
3211 | ospf_refresher_unregister_lsa(ospf, lsa); | |
3212 | ospf_lsa_flush(ospf, lsa); | |
3213 | break; | |
3214 | } | |
3215 | ||
3216 | return 0; | |
3217 | } | |
3218 | ||
3219 | void ospf_flush_self_originated_lsas_now(struct ospf *ospf) | |
3220 | { | |
3221 | struct listnode *node, *nnode; | |
3222 | struct listnode *node2, *nnode2; | |
3223 | struct ospf_area *area; | |
3224 | struct ospf_interface *oi; | |
3225 | struct ospf_lsa *lsa; | |
3226 | struct route_node *rn; | |
3227 | int need_to_flush_ase = 0; | |
3228 | ||
046460a1 CS |
3229 | ospf->inst_shutdown = 1; |
3230 | ||
d62a17ae | 3231 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { |
3232 | if ((lsa = area->router_lsa_self) != NULL) { | |
3233 | if (IS_DEBUG_OSPF_EVENT) | |
3234 | zlog_debug( | |
3235 | "LSA[Type%d:%s]: Schedule self-originated LSA to FLUSH", | |
3236 | lsa->data->type, | |
3237 | inet_ntoa(lsa->data->id)); | |
3238 | ||
3239 | ospf_refresher_unregister_lsa(ospf, lsa); | |
3240 | ospf_lsa_flush_area(lsa, area); | |
3241 | ospf_lsa_unlock(&area->router_lsa_self); | |
3242 | area->router_lsa_self = NULL; | |
3243 | } | |
3244 | ||
3245 | for (ALL_LIST_ELEMENTS(area->oiflist, node2, nnode2, oi)) { | |
3246 | if ((lsa = oi->network_lsa_self) != NULL | |
3247 | && oi->state == ISM_DR && oi->full_nbrs > 0) { | |
3248 | if (IS_DEBUG_OSPF_EVENT) | |
3249 | zlog_debug( | |
3250 | "LSA[Type%d:%s]: Schedule self-originated LSA to FLUSH", | |
3251 | lsa->data->type, | |
3252 | inet_ntoa(lsa->data->id)); | |
3253 | ||
3254 | ospf_refresher_unregister_lsa( | |
3255 | ospf, oi->network_lsa_self); | |
3256 | ospf_lsa_flush_area(oi->network_lsa_self, area); | |
3257 | ospf_lsa_unlock(&oi->network_lsa_self); | |
3258 | oi->network_lsa_self = NULL; | |
3259 | } | |
3260 | ||
3261 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK | |
3262 | && area->external_routing == OSPF_AREA_DEFAULT) | |
3263 | need_to_flush_ase = 1; | |
3264 | } | |
3265 | ||
996c9314 | 3266 | LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa) |
044506e7 | 3267 | ospf_lsa_flush_schedule(ospf, lsa); |
996c9314 | 3268 | LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa) |
044506e7 | 3269 | ospf_lsa_flush_schedule(ospf, lsa); |
996c9314 | 3270 | LSDB_LOOP (OPAQUE_LINK_LSDB(area), rn, lsa) |
044506e7 | 3271 | ospf_lsa_flush_schedule(ospf, lsa); |
996c9314 | 3272 | LSDB_LOOP (OPAQUE_AREA_LSDB(area), rn, lsa) |
044506e7 | 3273 | ospf_lsa_flush_schedule(ospf, lsa); |
d62a17ae | 3274 | } |
3275 | ||
3276 | if (need_to_flush_ase) { | |
996c9314 | 3277 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) |
044506e7 | 3278 | ospf_lsa_flush_schedule(ospf, lsa); |
996c9314 | 3279 | LSDB_LOOP (OPAQUE_AS_LSDB(ospf), rn, lsa) |
044506e7 | 3280 | ospf_lsa_flush_schedule(ospf, lsa); |
d62a17ae | 3281 | } |
3282 | ||
3283 | /* | |
3284 | * Make sure that the MaxAge LSA remover is executed immediately, | |
3285 | * without conflicting to other threads. | |
3286 | */ | |
3287 | if (ospf->t_maxage != NULL) { | |
3288 | OSPF_TIMER_OFF(ospf->t_maxage); | |
3289 | thread_execute(master, ospf_maxage_lsa_remover, ospf, 0); | |
3290 | } | |
3291 | ||
3292 | return; | |
718e3744 | 3293 | } |
718e3744 | 3294 | |
3295 | /* If there is self-originated LSA, then return 1, otherwise return 0. */ | |
3296 | /* An interface-independent version of ospf_lsa_is_self_originated */ | |
d62a17ae | 3297 | int ospf_lsa_is_self_originated(struct ospf *ospf, struct ospf_lsa *lsa) |
3298 | { | |
3299 | struct listnode *node; | |
3300 | struct ospf_interface *oi; | |
3301 | ||
3302 | /* This LSA is already checked. */ | |
3303 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_SELF_CHECKED)) | |
3304 | return IS_LSA_SELF(lsa); | |
3305 | ||
3306 | /* Make sure LSA is self-checked. */ | |
3307 | SET_FLAG(lsa->flags, OSPF_LSA_SELF_CHECKED); | |
3308 | ||
3309 | /* AdvRouter and Router ID is the same. */ | |
3310 | if (IPV4_ADDR_SAME(&lsa->data->adv_router, &ospf->router_id)) | |
3311 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
3312 | ||
3313 | /* LSA is router-LSA. */ | |
3314 | else if (lsa->data->type == OSPF_ROUTER_LSA | |
3315 | && IPV4_ADDR_SAME(&lsa->data->id, &ospf->router_id)) | |
3316 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
3317 | ||
3318 | /* LSA is network-LSA. Compare Link ID with all interfaces. */ | |
3319 | else if (lsa->data->type == OSPF_NETWORK_LSA) | |
3320 | for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) { | |
3321 | /* Ignore virtual link. */ | |
3322 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
3323 | if (oi->address->family == AF_INET) | |
3324 | if (IPV4_ADDR_SAME( | |
3325 | &lsa->data->id, | |
3326 | &oi->address->u.prefix4)) { | |
3327 | /* to make it easier later */ | |
3328 | SET_FLAG(lsa->flags, | |
3329 | OSPF_LSA_SELF); | |
3330 | return IS_LSA_SELF(lsa); | |
3331 | } | |
3332 | } | |
3333 | ||
3334 | return IS_LSA_SELF(lsa); | |
718e3744 | 3335 | } |
3336 | ||
3337 | /* Get unique Link State ID. */ | |
d62a17ae | 3338 | struct in_addr ospf_lsa_unique_id(struct ospf *ospf, struct ospf_lsdb *lsdb, |
d7c0a89a | 3339 | uint8_t type, struct prefix_ipv4 *p) |
d62a17ae | 3340 | { |
3341 | struct ospf_lsa *lsa; | |
3342 | struct in_addr mask, id; | |
3343 | ||
3344 | id = p->prefix; | |
3345 | ||
3346 | /* Check existence of LSA instance. */ | |
3347 | lsa = ospf_lsdb_lookup_by_id(lsdb, type, id, ospf->router_id); | |
3348 | if (lsa) { | |
3349 | struct as_external_lsa *al = | |
3350 | (struct as_external_lsa *)lsa->data; | |
3351 | if (ip_masklen(al->mask) == p->prefixlen) { | |
3352 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
3353 | zlog_debug( | |
3efd0893 | 3354 | "ospf_lsa_unique_id(): Can't get Link State ID for %s/%d", |
d62a17ae | 3355 | inet_ntoa(p->prefix), p->prefixlen); |
3356 | /* id.s_addr = 0; */ | |
3357 | id.s_addr = 0xffffffff; | |
3358 | return id; | |
3359 | } | |
3360 | /* Masklen differs, then apply wildcard mask to Link State ID. | |
9d303b37 | 3361 | */ |
d62a17ae | 3362 | else { |
3363 | masklen2ip(p->prefixlen, &mask); | |
3364 | ||
3365 | id.s_addr = p->prefix.s_addr | (~mask.s_addr); | |
3366 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, type, id, | |
3367 | ospf->router_id); | |
3368 | if (lsa) { | |
3369 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
3370 | zlog_debug( | |
3efd0893 | 3371 | "ospf_lsa_unique_id(): Can't get Link State ID for %s/%d", |
d62a17ae | 3372 | inet_ntoa(p->prefix), |
3373 | p->prefixlen); | |
3374 | /* id.s_addr = 0; */ | |
3375 | id.s_addr = 0xffffffff; | |
3376 | return id; | |
3377 | } | |
3378 | } | |
3379 | } | |
3380 | ||
3381 | return id; | |
718e3744 | 3382 | } |
3383 | ||
6b0655a2 | 3384 | |
70461d79 PJ |
3385 | #define LSA_ACTION_FLOOD_AREA 1 |
3386 | #define LSA_ACTION_FLUSH_AREA 2 | |
718e3744 | 3387 | |
d62a17ae | 3388 | struct lsa_action { |
d7c0a89a | 3389 | uint8_t action; |
d62a17ae | 3390 | struct ospf_area *area; |
3391 | struct ospf_lsa *lsa; | |
718e3744 | 3392 | }; |
3393 | ||
d62a17ae | 3394 | static int ospf_lsa_action(struct thread *t) |
718e3744 | 3395 | { |
d62a17ae | 3396 | struct lsa_action *data; |
718e3744 | 3397 | |
d62a17ae | 3398 | data = THREAD_ARG(t); |
718e3744 | 3399 | |
d62a17ae | 3400 | if (IS_DEBUG_OSPF(lsa, LSA) == OSPF_DEBUG_LSA) |
3401 | zlog_debug("LSA[Action]: Performing scheduled LSA action: %d", | |
3402 | data->action); | |
718e3744 | 3403 | |
d62a17ae | 3404 | switch (data->action) { |
3405 | case LSA_ACTION_FLOOD_AREA: | |
3406 | ospf_flood_through_area(data->area, NULL, data->lsa); | |
3407 | break; | |
3408 | case LSA_ACTION_FLUSH_AREA: | |
3409 | ospf_lsa_flush_area(data->lsa, data->area); | |
3410 | break; | |
3411 | } | |
718e3744 | 3412 | |
d62a17ae | 3413 | ospf_lsa_unlock(&data->lsa); /* Message */ |
3414 | XFREE(MTYPE_OSPF_MESSAGE, data); | |
3415 | return 0; | |
718e3744 | 3416 | } |
3417 | ||
d62a17ae | 3418 | void ospf_schedule_lsa_flood_area(struct ospf_area *area, struct ospf_lsa *lsa) |
718e3744 | 3419 | { |
d62a17ae | 3420 | struct lsa_action *data; |
718e3744 | 3421 | |
d62a17ae | 3422 | data = XCALLOC(MTYPE_OSPF_MESSAGE, sizeof(struct lsa_action)); |
3423 | data->action = LSA_ACTION_FLOOD_AREA; | |
3424 | data->area = area; | |
3425 | data->lsa = ospf_lsa_lock(lsa); /* Message / Flood area */ | |
718e3744 | 3426 | |
d62a17ae | 3427 | thread_add_event(master, ospf_lsa_action, data, 0, NULL); |
718e3744 | 3428 | } |
3429 | ||
d62a17ae | 3430 | void ospf_schedule_lsa_flush_area(struct ospf_area *area, struct ospf_lsa *lsa) |
718e3744 | 3431 | { |
d62a17ae | 3432 | struct lsa_action *data; |
718e3744 | 3433 | |
d62a17ae | 3434 | data = XCALLOC(MTYPE_OSPF_MESSAGE, sizeof(struct lsa_action)); |
3435 | data->action = LSA_ACTION_FLUSH_AREA; | |
3436 | data->area = area; | |
3437 | data->lsa = ospf_lsa_lock(lsa); /* Message / Flush area */ | |
718e3744 | 3438 | |
d62a17ae | 3439 | thread_add_event(master, ospf_lsa_action, data, 0, NULL); |
718e3744 | 3440 | } |
3441 | ||
6b0655a2 | 3442 | |
718e3744 | 3443 | /* LSA Refreshment functions. */ |
d62a17ae | 3444 | struct ospf_lsa *ospf_lsa_refresh(struct ospf *ospf, struct ospf_lsa *lsa) |
3445 | { | |
3446 | struct external_info *ei; | |
3447 | struct ospf_lsa *new = NULL; | |
3448 | assert(CHECK_FLAG(lsa->flags, OSPF_LSA_SELF)); | |
3449 | assert(IS_LSA_SELF(lsa)); | |
3450 | assert(lsa->lock > 0); | |
3451 | ||
3452 | switch (lsa->data->type) { | |
3453 | /* Router and Network LSAs are processed differently. */ | |
3454 | case OSPF_ROUTER_LSA: | |
3455 | new = ospf_router_lsa_refresh(lsa); | |
3456 | break; | |
3457 | case OSPF_NETWORK_LSA: | |
3458 | new = ospf_network_lsa_refresh(lsa); | |
3459 | break; | |
3460 | case OSPF_SUMMARY_LSA: | |
3461 | new = ospf_summary_lsa_refresh(ospf, lsa); | |
3462 | break; | |
3463 | case OSPF_ASBR_SUMMARY_LSA: | |
3464 | new = ospf_summary_asbr_lsa_refresh(ospf, lsa); | |
3465 | break; | |
3466 | case OSPF_AS_EXTERNAL_LSA: | |
3467 | /* Translated from NSSA Type-5s are refreshed when | |
3468 | * from refresh of Type-7 - do not refresh these directly. | |
3469 | */ | |
3470 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
3471 | break; | |
b5a8894d | 3472 | ei = ospf_external_info_check(ospf, lsa); |
d62a17ae | 3473 | if (ei) |
3474 | new = ospf_external_lsa_refresh(ospf, lsa, ei, | |
3475 | LSA_REFRESH_FORCE); | |
3476 | else | |
3477 | ospf_lsa_flush_as(ospf, lsa); | |
3478 | break; | |
3479 | case OSPF_OPAQUE_LINK_LSA: | |
3480 | case OSPF_OPAQUE_AREA_LSA: | |
3481 | case OSPF_OPAQUE_AS_LSA: | |
3482 | new = ospf_opaque_lsa_refresh(lsa); | |
3483 | break; | |
3484 | default: | |
3485 | break; | |
3486 | } | |
3487 | return new; | |
718e3744 | 3488 | } |
3489 | ||
d62a17ae | 3490 | void ospf_refresher_register_lsa(struct ospf *ospf, struct ospf_lsa *lsa) |
3491 | { | |
d7c0a89a | 3492 | uint16_t index, current_index; |
d62a17ae | 3493 | |
3494 | assert(lsa->lock > 0); | |
3495 | assert(IS_LSA_SELF(lsa)); | |
3496 | ||
3497 | if (lsa->refresh_list < 0) { | |
3498 | int delay; | |
3499 | int min_delay = | |
3500 | OSPF_LS_REFRESH_TIME - (2 * OSPF_LS_REFRESH_JITTER); | |
3501 | int max_delay = OSPF_LS_REFRESH_TIME - OSPF_LS_REFRESH_JITTER; | |
3502 | ||
3503 | /* We want to refresh the LSA within OSPF_LS_REFRESH_TIME which | |
3504 | * is | |
3505 | * 1800s. Use jitter so that we send the LSA sometime between | |
3506 | * 1680s | |
3507 | * and 1740s. | |
3508 | */ | |
5920b3eb RZ |
3509 | delay = (frr_weak_random() % (max_delay - min_delay)) |
3510 | + min_delay; | |
d62a17ae | 3511 | |
3512 | current_index = ospf->lsa_refresh_queue.index | |
3513 | + (monotime(NULL) - ospf->lsa_refresher_started) | |
3514 | / OSPF_LSA_REFRESHER_GRANULARITY; | |
3515 | ||
3516 | index = (current_index + delay / OSPF_LSA_REFRESHER_GRANULARITY) | |
3517 | % (OSPF_LSA_REFRESHER_SLOTS); | |
3518 | ||
3519 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
3520 | zlog_debug( | |
3521 | "LSA[Refresh:Type%d:%s]: age %d, added to index %d", | |
3522 | lsa->data->type, inet_ntoa(lsa->data->id), | |
3523 | LS_AGE(lsa), index); | |
3524 | ||
3525 | if (!ospf->lsa_refresh_queue.qs[index]) | |
3526 | ospf->lsa_refresh_queue.qs[index] = list_new(); | |
3527 | ||
3528 | listnode_add(ospf->lsa_refresh_queue.qs[index], | |
3529 | ospf_lsa_lock(lsa)); /* lsa_refresh_queue */ | |
3530 | lsa->refresh_list = index; | |
3531 | ||
3532 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
3533 | zlog_debug( | |
3efd0893 | 3534 | "LSA[Refresh:Type%d:%s]: ospf_refresher_register_lsa(): setting refresh_list on lsa %p (slod %d)", |
d62a17ae | 3535 | lsa->data->type, inet_ntoa(lsa->data->id), |
3536 | (void *)lsa, index); | |
3537 | } | |
3538 | } | |
3539 | ||
3540 | void ospf_refresher_unregister_lsa(struct ospf *ospf, struct ospf_lsa *lsa) | |
3541 | { | |
3542 | assert(lsa->lock > 0); | |
3543 | assert(IS_LSA_SELF(lsa)); | |
3544 | if (lsa->refresh_list >= 0) { | |
3545 | struct list *refresh_list = | |
3546 | ospf->lsa_refresh_queue.qs[lsa->refresh_list]; | |
3547 | listnode_delete(refresh_list, lsa); | |
3548 | if (!listcount(refresh_list)) { | |
6a154c88 | 3549 | list_delete(&refresh_list); |
d62a17ae | 3550 | ospf->lsa_refresh_queue.qs[lsa->refresh_list] = NULL; |
3551 | } | |
d62a17ae | 3552 | lsa->refresh_list = -1; |
a61b32f0 | 3553 | ospf_lsa_unlock(&lsa); /* lsa_refresh_queue */ |
d62a17ae | 3554 | } |
3555 | } | |
3556 | ||
3557 | int ospf_lsa_refresh_walker(struct thread *t) | |
3558 | { | |
3559 | struct list *refresh_list; | |
3560 | struct listnode *node, *nnode; | |
3561 | struct ospf *ospf = THREAD_ARG(t); | |
3562 | struct ospf_lsa *lsa; | |
3563 | int i; | |
3564 | struct list *lsa_to_refresh = list_new(); | |
3565 | ||
3566 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
3567 | zlog_debug("LSA[Refresh]: ospf_lsa_refresh_walker(): start"); | |
3568 | ||
3569 | ||
3570 | i = ospf->lsa_refresh_queue.index; | |
3571 | ||
3572 | /* Note: if clock has jumped backwards, then time change could be | |
3573 | negative, | |
3574 | so we are careful to cast the expression to unsigned before taking | |
3575 | modulus. */ | |
3576 | ospf->lsa_refresh_queue.index = | |
3577 | ((unsigned long)(ospf->lsa_refresh_queue.index | |
3578 | + (monotime(NULL) | |
3579 | - ospf->lsa_refresher_started) | |
3580 | / OSPF_LSA_REFRESHER_GRANULARITY)) | |
3581 | % OSPF_LSA_REFRESHER_SLOTS; | |
3582 | ||
3583 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
3584 | zlog_debug( | |
3585 | "LSA[Refresh]: ospf_lsa_refresh_walker(): next index %d", | |
3586 | ospf->lsa_refresh_queue.index); | |
3587 | ||
3588 | for (; i != ospf->lsa_refresh_queue.index; | |
3589 | i = (i + 1) % OSPF_LSA_REFRESHER_SLOTS) { | |
3590 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
3591 | zlog_debug( | |
3efd0893 | 3592 | "LSA[Refresh]: ospf_lsa_refresh_walker(): refresh index %d", |
d62a17ae | 3593 | i); |
3594 | ||
3595 | refresh_list = ospf->lsa_refresh_queue.qs[i]; | |
3596 | ||
3597 | assert(i >= 0); | |
3598 | ||
3599 | ospf->lsa_refresh_queue.qs[i] = NULL; | |
3600 | ||
3601 | if (refresh_list) { | |
3602 | for (ALL_LIST_ELEMENTS(refresh_list, node, nnode, | |
3603 | lsa)) { | |
3604 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
3605 | zlog_debug( | |
3efd0893 | 3606 | "LSA[Refresh:Type%d:%s]: ospf_lsa_refresh_walker(): refresh lsa %p (slot %d)", |
d62a17ae | 3607 | lsa->data->type, |
3608 | inet_ntoa(lsa->data->id), | |
3609 | (void *)lsa, i); | |
3610 | ||
3611 | assert(lsa->lock > 0); | |
3612 | list_delete_node(refresh_list, node); | |
3613 | lsa->refresh_list = -1; | |
3614 | listnode_add(lsa_to_refresh, lsa); | |
3615 | } | |
6a154c88 | 3616 | list_delete(&refresh_list); |
d62a17ae | 3617 | } |
3618 | } | |
3619 | ||
3620 | ospf->t_lsa_refresher = NULL; | |
3621 | thread_add_timer(master, ospf_lsa_refresh_walker, ospf, | |
3622 | ospf->lsa_refresh_interval, &ospf->t_lsa_refresher); | |
3623 | ospf->lsa_refresher_started = monotime(NULL); | |
3624 | ||
3625 | for (ALL_LIST_ELEMENTS(lsa_to_refresh, node, nnode, lsa)) { | |
3626 | ospf_lsa_refresh(ospf, lsa); | |
3627 | assert(lsa->lock > 0); | |
3628 | ospf_lsa_unlock( | |
3629 | &lsa); /* lsa_refresh_queue & temp for lsa_to_refresh*/ | |
3630 | } | |
3631 | ||
6a154c88 | 3632 | list_delete(&lsa_to_refresh); |
d62a17ae | 3633 | |
3634 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
3635 | zlog_debug("LSA[Refresh]: ospf_lsa_refresh_walker(): end"); | |
3636 | ||
3637 | return 0; | |
3638 | } |