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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * OSPF Link State Advertisement | |
4 | * Copyright (C) 1999, 2000 Toshiaki Takada | |
5 | */ | |
6 | ||
7 | #include <zebra.h> | |
8 | ||
9 | #include "monotime.h" | |
10 | #include "linklist.h" | |
11 | #include "prefix.h" | |
12 | #include "if.h" | |
13 | #include "table.h" | |
14 | #include "memory.h" | |
15 | #include "stream.h" | |
16 | #include "log.h" | |
17 | #include "frrevent.h" | |
18 | #include "hash.h" | |
19 | #include "sockunion.h" /* for inet_aton() */ | |
20 | #include "checksum.h" | |
21 | #include "network.h" | |
22 | ||
23 | #include "ospfd/ospfd.h" | |
24 | #include "ospfd/ospf_interface.h" | |
25 | #include "ospfd/ospf_ism.h" | |
26 | #include "ospfd/ospf_asbr.h" | |
27 | #include "ospfd/ospf_lsa.h" | |
28 | #include "ospfd/ospf_lsdb.h" | |
29 | #include "ospfd/ospf_neighbor.h" | |
30 | #include "ospfd/ospf_nsm.h" | |
31 | #include "ospfd/ospf_flood.h" | |
32 | #include "ospfd/ospf_packet.h" | |
33 | #include "ospfd/ospf_spf.h" | |
34 | #include "ospfd/ospf_dump.h" | |
35 | #include "ospfd/ospf_route.h" | |
36 | #include "ospfd/ospf_ase.h" | |
37 | #include "ospfd/ospf_zebra.h" | |
38 | #include "ospfd/ospf_abr.h" | |
39 | #include "ospfd/ospf_errors.h" | |
40 | ||
41 | static struct ospf_lsa *ospf_handle_summarylsa_lsId_chg(struct ospf_area *area, | |
42 | struct prefix_ipv4 *p, | |
43 | uint8_t type, | |
44 | uint32_t metric, | |
45 | struct in_addr old_id); | |
46 | static struct ospf_lsa * | |
47 | ospf_summary_lsa_prepare_and_flood(struct prefix_ipv4 *p, uint32_t metric, | |
48 | struct ospf_area *area, struct in_addr id); | |
49 | static struct ospf_lsa *ospf_summary_lsa_refresh(struct ospf *ospf, | |
50 | struct ospf_lsa *lsa); | |
51 | static struct ospf_lsa * | |
52 | ospf_asbr_summary_lsa_prepare_and_flood(struct prefix_ipv4 *p, uint32_t metric, | |
53 | struct ospf_area *area, | |
54 | struct in_addr id); | |
55 | static struct ospf_lsa *ospf_summary_asbr_lsa_refresh(struct ospf *ospf, | |
56 | struct ospf_lsa *lsa); | |
57 | static struct ospf_lsa *ospf_handle_exnl_lsa_lsId_chg(struct ospf *ospf, | |
58 | struct external_info *ei, | |
59 | struct in_addr id); | |
60 | static struct ospf_lsa * | |
61 | ospf_exnl_lsa_prepare_and_flood(struct ospf *ospf, struct external_info *ei, | |
62 | struct in_addr id); | |
63 | ||
64 | uint32_t get_metric(uint8_t *metric) | |
65 | { | |
66 | uint32_t m; | |
67 | m = metric[0]; | |
68 | m = (m << 8) + metric[1]; | |
69 | m = (m << 8) + metric[2]; | |
70 | return m; | |
71 | } | |
72 | ||
73 | /** @brief The Function checks self generated DoNotAge. | |
74 | * @param lsa pointer. | |
75 | * @return true or false. | |
76 | */ | |
77 | bool ospf_check_dna_lsa(const struct ospf_lsa *lsa) | |
78 | { | |
79 | return ((IS_LSA_SELF(lsa) && CHECK_FLAG(lsa->data->ls_age, DO_NOT_AGE)) | |
80 | ? true | |
81 | : false); | |
82 | } | |
83 | ||
84 | struct timeval int2tv(int a) | |
85 | { | |
86 | struct timeval ret; | |
87 | ||
88 | ret.tv_sec = a; | |
89 | ret.tv_usec = 0; | |
90 | ||
91 | return ret; | |
92 | } | |
93 | ||
94 | struct timeval msec2tv(int a) | |
95 | { | |
96 | struct timeval ret; | |
97 | ||
98 | ret.tv_sec = a / 1000; | |
99 | ret.tv_usec = (a % 1000) * 1000; | |
100 | ||
101 | return ret; | |
102 | } | |
103 | ||
104 | int ospf_lsa_refresh_delay(struct ospf_lsa *lsa) | |
105 | { | |
106 | struct timeval delta; | |
107 | int delay = 0; | |
108 | ||
109 | if (monotime_since(&lsa->tv_orig, &delta) | |
110 | < OSPF_MIN_LS_INTERVAL * 1000LL) { | |
111 | struct timeval minv = msec2tv(OSPF_MIN_LS_INTERVAL); | |
112 | timersub(&minv, &delta, &minv); | |
113 | ||
114 | /* TBD: remove padding to full sec, return timeval instead */ | |
115 | delay = minv.tv_sec + !!minv.tv_usec; | |
116 | ||
117 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
118 | zlog_debug( | |
119 | "LSA[Type%d:%pI4]: Refresh timer delay %d seconds", | |
120 | lsa->data->type, &lsa->data->id, | |
121 | delay); | |
122 | ||
123 | assert(delay > 0); | |
124 | } | |
125 | ||
126 | return delay; | |
127 | } | |
128 | ||
129 | ||
130 | int get_age(struct ospf_lsa *lsa) | |
131 | { | |
132 | struct timeval rel; | |
133 | ||
134 | /* As per rfc4136, the self-originated LSAs in their | |
135 | * own database keep aging, however rfc doesn't tell | |
136 | * till how long the LSA should be aged, as of now | |
137 | * we are capping it for OSPF_LSA_MAXAGE. | |
138 | */ | |
139 | ||
140 | /* If LSA is marked as donotage */ | |
141 | if (CHECK_FLAG(lsa->data->ls_age, DO_NOT_AGE) && !IS_LSA_SELF(lsa)) | |
142 | return ntohs(lsa->data->ls_age); | |
143 | ||
144 | monotime_since(&lsa->tv_recv, &rel); | |
145 | return ntohs(lsa->data->ls_age) + rel.tv_sec; | |
146 | } | |
147 | ||
148 | ||
149 | /* Fletcher Checksum -- Refer to RFC1008. */ | |
150 | ||
151 | /* All the offsets are zero-based. The offsets in the RFC1008 are | |
152 | one-based. */ | |
153 | uint16_t ospf_lsa_checksum(struct lsa_header *lsa) | |
154 | { | |
155 | uint8_t *buffer = &lsa->options; | |
156 | int options_offset = buffer - (uint8_t *)&lsa->ls_age; /* should be 2 */ | |
157 | ||
158 | /* Skip the AGE field */ | |
159 | uint16_t len = ntohs(lsa->length) - options_offset; | |
160 | ||
161 | /* Checksum offset starts from "options" field, not the beginning of the | |
162 | lsa_header struct. The offset is 14, rather than 16. */ | |
163 | int checksum_offset = (uint8_t *)&lsa->checksum - buffer; | |
164 | ||
165 | return fletcher_checksum(buffer, len, checksum_offset); | |
166 | } | |
167 | ||
168 | int ospf_lsa_checksum_valid(struct lsa_header *lsa) | |
169 | { | |
170 | uint8_t *buffer = &lsa->options; | |
171 | int options_offset = buffer - (uint8_t *)&lsa->ls_age; /* should be 2 */ | |
172 | ||
173 | /* Skip the AGE field */ | |
174 | uint16_t len = ntohs(lsa->length) - options_offset; | |
175 | ||
176 | return (fletcher_checksum(buffer, len, FLETCHER_CHECKSUM_VALIDATE) | |
177 | == 0); | |
178 | } | |
179 | ||
180 | ||
181 | /* Create OSPF LSA. */ | |
182 | struct ospf_lsa *ospf_lsa_new(void) | |
183 | { | |
184 | struct ospf_lsa *new; | |
185 | ||
186 | new = XCALLOC(MTYPE_OSPF_LSA, sizeof(struct ospf_lsa)); | |
187 | ||
188 | new->flags = 0; | |
189 | new->lock = 1; | |
190 | new->retransmit_counter = 0; | |
191 | monotime(&new->tv_recv); | |
192 | new->tv_orig = new->tv_recv; | |
193 | new->refresh_list = -1; | |
194 | new->vrf_id = VRF_DEFAULT; | |
195 | new->to_be_acknowledged = 0; | |
196 | new->opaque_zero_len_delete = 0; | |
197 | ||
198 | return new; | |
199 | } | |
200 | ||
201 | struct ospf_lsa *ospf_lsa_new_and_data(size_t size) | |
202 | { | |
203 | struct ospf_lsa *new; | |
204 | ||
205 | new = ospf_lsa_new(); | |
206 | new->data = ospf_lsa_data_new(size); | |
207 | new->size = size; | |
208 | ||
209 | return new; | |
210 | } | |
211 | ||
212 | /* Duplicate OSPF LSA. */ | |
213 | struct ospf_lsa *ospf_lsa_dup(struct ospf_lsa *lsa) | |
214 | { | |
215 | struct ospf_lsa *new; | |
216 | ||
217 | if (lsa == NULL) | |
218 | return NULL; | |
219 | ||
220 | new = XCALLOC(MTYPE_OSPF_LSA, sizeof(struct ospf_lsa)); | |
221 | ||
222 | memcpy(new, lsa, sizeof(struct ospf_lsa)); | |
223 | UNSET_FLAG(new->flags, OSPF_LSA_DISCARD); | |
224 | new->lock = 1; | |
225 | new->retransmit_counter = 0; | |
226 | new->data = ospf_lsa_data_dup(lsa->data); | |
227 | ||
228 | /* kevinm: Clear the refresh_list, otherwise there are going | |
229 | to be problems when we try to remove the LSA from the | |
230 | queue (which it's not a member of.) | |
231 | XXX: Should we add the LSA to the refresh_list queue? */ | |
232 | new->refresh_list = -1; | |
233 | ||
234 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
235 | zlog_debug("LSA: duplicated %p (new: %p)", (void *)lsa, | |
236 | (void *)new); | |
237 | ||
238 | return new; | |
239 | } | |
240 | ||
241 | /* Free OSPF LSA. */ | |
242 | void ospf_lsa_free(struct ospf_lsa *lsa) | |
243 | { | |
244 | assert(lsa->lock == 0); | |
245 | ||
246 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
247 | zlog_debug("LSA: freed %p", (void *)lsa); | |
248 | ||
249 | /* Delete LSA data. */ | |
250 | if (lsa->data != NULL) | |
251 | ospf_lsa_data_free(lsa->data); | |
252 | ||
253 | assert(lsa->refresh_list < 0); | |
254 | ||
255 | memset(lsa, 0, sizeof(struct ospf_lsa)); | |
256 | XFREE(MTYPE_OSPF_LSA, lsa); | |
257 | } | |
258 | ||
259 | /* Lock LSA. */ | |
260 | struct ospf_lsa *ospf_lsa_lock(struct ospf_lsa *lsa) | |
261 | { | |
262 | lsa->lock++; | |
263 | return lsa; | |
264 | } | |
265 | ||
266 | /* Unlock LSA. */ | |
267 | void ospf_lsa_unlock(struct ospf_lsa **lsa) | |
268 | { | |
269 | /* This is sanity check. */ | |
270 | if (!lsa || !*lsa) | |
271 | return; | |
272 | ||
273 | (*lsa)->lock--; | |
274 | ||
275 | assert((*lsa)->lock >= 0); | |
276 | ||
277 | if ((*lsa)->lock == 0) { | |
278 | assert(CHECK_FLAG((*lsa)->flags, OSPF_LSA_DISCARD)); | |
279 | ospf_lsa_free(*lsa); | |
280 | *lsa = NULL; | |
281 | } | |
282 | } | |
283 | ||
284 | /* Check discard flag. */ | |
285 | void ospf_lsa_discard(struct ospf_lsa *lsa) | |
286 | { | |
287 | if (!CHECK_FLAG(lsa->flags, OSPF_LSA_DISCARD)) { | |
288 | SET_FLAG(lsa->flags, OSPF_LSA_DISCARD); | |
289 | ospf_lsa_unlock(&lsa); | |
290 | } | |
291 | } | |
292 | ||
293 | /* Create LSA data. */ | |
294 | struct lsa_header *ospf_lsa_data_new(size_t size) | |
295 | { | |
296 | return XCALLOC(MTYPE_OSPF_LSA_DATA, size); | |
297 | } | |
298 | ||
299 | /* Duplicate LSA data. */ | |
300 | struct lsa_header *ospf_lsa_data_dup(struct lsa_header *lsah) | |
301 | { | |
302 | struct lsa_header *new; | |
303 | ||
304 | new = ospf_lsa_data_new(ntohs(lsah->length)); | |
305 | memcpy(new, lsah, ntohs(lsah->length)); | |
306 | ||
307 | return new; | |
308 | } | |
309 | ||
310 | /* Free LSA data. */ | |
311 | void ospf_lsa_data_free(struct lsa_header *lsah) | |
312 | { | |
313 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
314 | zlog_debug("LSA[Type%d:%pI4]: data freed %p", lsah->type, | |
315 | &lsah->id, (void *)lsah); | |
316 | ||
317 | XFREE(MTYPE_OSPF_LSA_DATA, lsah); | |
318 | } | |
319 | ||
320 | ||
321 | /* LSA general functions. */ | |
322 | ||
323 | const char *dump_lsa_key(struct ospf_lsa *lsa) | |
324 | { | |
325 | static char buf[sizeof("Type255,id(255.255.255.255),ar(255.255.255.255)")+1]; | |
326 | struct lsa_header *lsah; | |
327 | ||
328 | if (lsa != NULL && (lsah = lsa->data) != NULL) { | |
329 | char id[INET_ADDRSTRLEN], ar[INET_ADDRSTRLEN]; | |
330 | inet_ntop(AF_INET, &lsah->id, id, sizeof(id)); | |
331 | inet_ntop(AF_INET, &lsah->adv_router, ar, sizeof(ar)); | |
332 | ||
333 | snprintf(buf, sizeof(buf), "Type%d,id(%s),ar(%s)", lsah->type, | |
334 | id, ar); | |
335 | } else | |
336 | strlcpy(buf, "NULL", sizeof(buf)); | |
337 | ||
338 | return buf; | |
339 | } | |
340 | ||
341 | uint32_t lsa_seqnum_increment(struct ospf_lsa *lsa) | |
342 | { | |
343 | uint32_t seqnum; | |
344 | ||
345 | seqnum = ntohl(lsa->data->ls_seqnum) + 1; | |
346 | ||
347 | return htonl(seqnum); | |
348 | } | |
349 | ||
350 | void lsa_header_set(struct stream *s, uint8_t options, uint8_t type, | |
351 | struct in_addr id, struct in_addr router_id) | |
352 | { | |
353 | struct lsa_header *lsah; | |
354 | ||
355 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
356 | ||
357 | lsah->ls_age = htons(OSPF_LSA_INITIAL_AGE); | |
358 | lsah->options = options; | |
359 | lsah->type = type; | |
360 | lsah->id = id; | |
361 | lsah->adv_router = router_id; | |
362 | lsah->ls_seqnum = htonl(OSPF_INITIAL_SEQUENCE_NUMBER); | |
363 | ||
364 | stream_forward_endp(s, OSPF_LSA_HEADER_SIZE); | |
365 | } | |
366 | ||
367 | ||
368 | /* router-LSA related functions. */ | |
369 | /* Get router-LSA flags. */ | |
370 | uint8_t router_lsa_flags(struct ospf_area *area) | |
371 | { | |
372 | uint8_t flags; | |
373 | ||
374 | flags = area->ospf->flags; | |
375 | ||
376 | /* Set virtual link flag. */ | |
377 | if (ospf_full_virtual_nbrs(area)) | |
378 | SET_FLAG(flags, ROUTER_LSA_VIRTUAL); | |
379 | else | |
380 | /* Just sanity check */ | |
381 | UNSET_FLAG(flags, ROUTER_LSA_VIRTUAL); | |
382 | ||
383 | /* Set Shortcut ABR behabiour flag. */ | |
384 | UNSET_FLAG(flags, ROUTER_LSA_SHORTCUT); | |
385 | if (area->ospf->abr_type == OSPF_ABR_SHORTCUT) | |
386 | if (!OSPF_IS_AREA_BACKBONE(area)) | |
387 | if ((area->shortcut_configured == OSPF_SHORTCUT_DEFAULT | |
388 | && area->ospf->backbone == NULL) | |
389 | || area->shortcut_configured | |
390 | == OSPF_SHORTCUT_ENABLE) | |
391 | SET_FLAG(flags, ROUTER_LSA_SHORTCUT); | |
392 | ||
393 | /* ASBR can't exit in stub area. */ | |
394 | if (area->external_routing == OSPF_AREA_STUB) | |
395 | UNSET_FLAG(flags, ROUTER_LSA_EXTERNAL); | |
396 | /* If ASBR set External flag */ | |
397 | else if (IS_OSPF_ASBR(area->ospf)) | |
398 | SET_FLAG(flags, ROUTER_LSA_EXTERNAL); | |
399 | ||
400 | /* Set ABR dependent flags */ | |
401 | if (IS_OSPF_ABR(area->ospf)) { | |
402 | SET_FLAG(flags, ROUTER_LSA_BORDER); | |
403 | /* If Area is NSSA and we are both ABR and unconditional | |
404 | * translator, | |
405 | * set Nt bit to inform other routers. | |
406 | */ | |
407 | if ((area->external_routing == OSPF_AREA_NSSA) | |
408 | && (area->NSSATranslatorRole == OSPF_NSSA_ROLE_ALWAYS)) | |
409 | SET_FLAG(flags, ROUTER_LSA_NT); | |
410 | } | |
411 | return flags; | |
412 | } | |
413 | ||
414 | /* Lookup neighbor other than myself. | |
415 | And check neighbor count, | |
416 | Point-to-Point link must have only 1 neighbor. */ | |
417 | struct ospf_neighbor *ospf_nbr_lookup_ptop(struct ospf_interface *oi) | |
418 | { | |
419 | struct ospf_neighbor *nbr = NULL; | |
420 | struct route_node *rn; | |
421 | ||
422 | /* Search neighbor, there must be one of two nbrs. */ | |
423 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
424 | if ((nbr = rn->info)) | |
425 | if (!IPV4_ADDR_SAME(&nbr->router_id, | |
426 | &oi->ospf->router_id)) | |
427 | if (nbr->state == NSM_Full) { | |
428 | route_unlock_node(rn); | |
429 | break; | |
430 | } | |
431 | ||
432 | /* PtoP link must have only 1 neighbor. */ | |
433 | if (ospf_nbr_count(oi, 0) > 1) | |
434 | flog_warn( | |
435 | EC_OSPF_PTP_NEIGHBOR, | |
436 | "Point-to-Point link on interface %s has more than 1 neighbor.", | |
437 | oi->ifp->name); | |
438 | ||
439 | return nbr; | |
440 | } | |
441 | ||
442 | /* Determine cost of link, taking RFC3137 stub-router support into | |
443 | * consideration | |
444 | */ | |
445 | static uint16_t ospf_link_cost(struct ospf_interface *oi) | |
446 | { | |
447 | /* RFC3137 stub router support */ | |
448 | if (!CHECK_FLAG(oi->area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED)) | |
449 | return oi->output_cost; | |
450 | else | |
451 | return OSPF_OUTPUT_COST_INFINITE; | |
452 | } | |
453 | ||
454 | /* Set a link information. */ | |
455 | char link_info_set(struct stream **s, struct in_addr id, struct in_addr data, | |
456 | uint8_t type, uint8_t tos, uint16_t cost) | |
457 | { | |
458 | /* LSA stream is initially allocated to OSPF_MAX_LSA_SIZE, suits | |
459 | * vast majority of cases. Some rare routers with lots of links need | |
460 | * more. | |
461 | * we try accommodate those here. | |
462 | */ | |
463 | if (STREAM_WRITEABLE(*s) < OSPF_ROUTER_LSA_LINK_SIZE) { | |
464 | size_t ret = OSPF_MAX_LSA_SIZE; | |
465 | ||
466 | /* Can we enlarge the stream still? */ | |
467 | if (STREAM_SIZE(*s) == OSPF_MAX_LSA_SIZE) { | |
468 | /* we futz the size here for simplicity, really we need | |
469 | * to account | |
470 | * for just: | |
471 | * IP Header - (sizeof(struct ip)) | |
472 | * OSPF Header - OSPF_HEADER_SIZE | |
473 | * LSA Header - OSPF_LSA_HEADER_SIZE | |
474 | * MD5 auth data, if MD5 is configured - | |
475 | * OSPF_AUTH_MD5_SIZE. | |
476 | * | |
477 | * Simpler just to subtract OSPF_MAX_LSA_SIZE though. | |
478 | */ | |
479 | ret = stream_resize_inplace( | |
480 | s, OSPF_MAX_PACKET_SIZE - OSPF_MAX_LSA_SIZE); | |
481 | } | |
482 | ||
483 | if (ret == OSPF_MAX_LSA_SIZE) { | |
484 | flog_warn( | |
485 | EC_OSPF_LSA_SIZE, | |
486 | "%s: Out of space in LSA stream, left %zd, size %zd", | |
487 | __func__, STREAM_WRITEABLE(*s), | |
488 | STREAM_SIZE(*s)); | |
489 | return 0; | |
490 | } | |
491 | } | |
492 | ||
493 | /* TOS based routing is not supported. */ | |
494 | stream_put_ipv4(*s, id.s_addr); /* Link ID. */ | |
495 | stream_put_ipv4(*s, data.s_addr); /* Link Data. */ | |
496 | stream_putc(*s, type); /* Link Type. */ | |
497 | stream_putc(*s, tos); /* TOS = 0. */ | |
498 | stream_putw(*s, cost); /* Link Cost. */ | |
499 | ||
500 | return 1; | |
501 | } | |
502 | ||
503 | /* Describe Point-to-Point link (Section 12.4.1.1). */ | |
504 | ||
505 | /* Note: If the interface is configured as point-to-point dmvpn then the other | |
506 | * end of link is dmvpn hub with point-to-multipoint ospf network type. The | |
507 | * hub then expects this router to populate the stub network and also Link Data | |
508 | * Field set to IP Address and not MIB-II ifIndex | |
509 | */ | |
510 | static int lsa_link_ptop_set(struct stream **s, struct ospf_interface *oi) | |
511 | { | |
512 | int links = 0; | |
513 | struct ospf_neighbor *nbr; | |
514 | struct in_addr id, mask, data; | |
515 | uint16_t cost = ospf_link_cost(oi); | |
516 | ||
517 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
518 | zlog_debug("LSA[Type1]: Set link Point-to-Point"); | |
519 | ||
520 | if ((nbr = ospf_nbr_lookup_ptop(oi))) | |
521 | if (nbr->state == NSM_Full) { | |
522 | if (CHECK_FLAG(oi->connected->flags, | |
523 | ZEBRA_IFA_UNNUMBERED) | |
524 | && !oi->ptp_dmvpn) { | |
525 | /* For unnumbered point-to-point networks, the | |
526 | Link Data field | |
527 | should specify the interface's MIB-II ifIndex | |
528 | value. */ | |
529 | data.s_addr = htonl(oi->ifp->ifindex); | |
530 | links += link_info_set( | |
531 | s, nbr->router_id, data, | |
532 | LSA_LINK_TYPE_POINTOPOINT, 0, cost); | |
533 | } else { | |
534 | links += link_info_set( | |
535 | s, nbr->router_id, | |
536 | oi->address->u.prefix4, | |
537 | LSA_LINK_TYPE_POINTOPOINT, 0, cost); | |
538 | } | |
539 | } | |
540 | ||
541 | /* no need for a stub link for unnumbered interfaces */ | |
542 | if (oi->ptp_dmvpn | |
543 | || !CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED)) { | |
544 | /* Regardless of the state of the neighboring router, we must | |
545 | add a Type 3 link (stub network). | |
546 | N.B. Options 1 & 2 share basically the same logic. */ | |
547 | masklen2ip(oi->address->prefixlen, &mask); | |
548 | id.s_addr = CONNECTED_PREFIX(oi->connected)->u.prefix4.s_addr | |
549 | & mask.s_addr; | |
550 | links += link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, | |
551 | oi->output_cost); | |
552 | } | |
553 | ||
554 | return links; | |
555 | } | |
556 | ||
557 | /* Describe Broadcast Link. */ | |
558 | static int lsa_link_broadcast_set(struct stream **s, struct ospf_interface *oi) | |
559 | { | |
560 | struct ospf_neighbor *dr; | |
561 | struct in_addr id, mask; | |
562 | uint16_t cost = ospf_link_cost(oi); | |
563 | ||
564 | /* Describe Type 3 Link. */ | |
565 | if (oi->state == ISM_Waiting) { | |
566 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
567 | zlog_debug( | |
568 | "LSA[Type1]: Interface %s is in state Waiting. Adding stub interface", | |
569 | oi->ifp->name); | |
570 | masklen2ip(oi->address->prefixlen, &mask); | |
571 | id.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
572 | return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, | |
573 | oi->output_cost); | |
574 | } | |
575 | ||
576 | dr = ospf_nbr_lookup_by_addr(oi->nbrs, &DR(oi)); | |
577 | /* Describe Type 2 link. */ | |
578 | if (dr && (dr->state == NSM_Full | |
579 | || IPV4_ADDR_SAME(&oi->address->u.prefix4, &DR(oi))) | |
580 | && ospf_nbr_count(oi, NSM_Full) > 0) { | |
581 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
582 | zlog_debug( | |
583 | "LSA[Type1]: Interface %s has a DR. Adding transit interface", | |
584 | oi->ifp->name); | |
585 | return link_info_set(s, DR(oi), oi->address->u.prefix4, | |
586 | LSA_LINK_TYPE_TRANSIT, 0, cost); | |
587 | } | |
588 | /* Describe type 3 link. */ | |
589 | else { | |
590 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
591 | zlog_debug( | |
592 | "LSA[Type1]: Interface %s has no DR. Adding stub interface", | |
593 | oi->ifp->name); | |
594 | masklen2ip(oi->address->prefixlen, &mask); | |
595 | id.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
596 | return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, | |
597 | oi->output_cost); | |
598 | } | |
599 | } | |
600 | ||
601 | static int lsa_link_loopback_set(struct stream **s, struct ospf_interface *oi) | |
602 | { | |
603 | struct in_addr id, mask; | |
604 | ||
605 | /* Describe Type 3 Link. */ | |
606 | if (oi->state != ISM_Loopback) | |
607 | return 0; | |
608 | ||
609 | mask.s_addr = 0xffffffff; | |
610 | id.s_addr = oi->address->u.prefix4.s_addr; | |
611 | return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, 0); | |
612 | } | |
613 | ||
614 | /* Describe Virtual Link. */ | |
615 | static int lsa_link_virtuallink_set(struct stream **s, | |
616 | struct ospf_interface *oi) | |
617 | { | |
618 | struct ospf_neighbor *nbr; | |
619 | uint16_t cost = ospf_link_cost(oi); | |
620 | ||
621 | if (oi->state == ISM_PointToPoint) | |
622 | if ((nbr = ospf_nbr_lookup_ptop(oi))) | |
623 | if (nbr->state == NSM_Full) { | |
624 | return link_info_set(s, nbr->router_id, | |
625 | oi->address->u.prefix4, | |
626 | LSA_LINK_TYPE_VIRTUALLINK, | |
627 | 0, cost); | |
628 | } | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | #define lsa_link_nbma_set(S,O) lsa_link_broadcast_set (S, O) | |
634 | ||
635 | /* this function add for support point-to-multipoint ,see rfc2328 | |
636 | 12.4.1.4.*/ | |
637 | /* from "edward rrr" <edward_rrr@hotmail.com> | |
638 | http://marc.theaimsgroup.com/?l=zebra&m=100739222210507&w=2 */ | |
639 | static int lsa_link_ptomp_set(struct stream **s, struct ospf_interface *oi) | |
640 | { | |
641 | int links = 0; | |
642 | struct route_node *rn; | |
643 | struct ospf_neighbor *nbr = NULL; | |
644 | struct in_addr id, mask; | |
645 | uint16_t cost = ospf_link_cost(oi); | |
646 | ||
647 | mask.s_addr = 0xffffffff; | |
648 | id.s_addr = oi->address->u.prefix4.s_addr; | |
649 | links += link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, 0); | |
650 | ||
651 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
652 | zlog_debug("PointToMultipoint: running ptomultip_set"); | |
653 | ||
654 | /* Search neighbor, */ | |
655 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
656 | if ((nbr = rn->info) != NULL) | |
657 | /* Ignore myself. */ | |
658 | if (!IPV4_ADDR_SAME(&nbr->router_id, | |
659 | &oi->ospf->router_id)) | |
660 | if (nbr->state == NSM_Full) | |
661 | ||
662 | { | |
663 | links += link_info_set( | |
664 | s, nbr->router_id, | |
665 | oi->address->u.prefix4, | |
666 | LSA_LINK_TYPE_POINTOPOINT, 0, | |
667 | cost); | |
668 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
669 | zlog_debug( | |
670 | "PointToMultipoint: set link to %pI4", | |
671 | &oi->address->u.prefix4); | |
672 | } | |
673 | ||
674 | return links; | |
675 | } | |
676 | ||
677 | /* Set router-LSA link information. */ | |
678 | static int router_lsa_link_set(struct stream **s, struct ospf_area *area) | |
679 | { | |
680 | struct listnode *node; | |
681 | struct ospf_interface *oi; | |
682 | int links = 0; | |
683 | ||
684 | for (ALL_LIST_ELEMENTS_RO(area->oiflist, node, oi)) { | |
685 | struct interface *ifp = oi->ifp; | |
686 | ||
687 | /* Check interface is up, OSPF is enable. */ | |
688 | if (if_is_operative(ifp)) { | |
689 | if (oi->state != ISM_Down) { | |
690 | oi->lsa_pos_beg = links; | |
691 | /* Describe each link. */ | |
692 | switch (oi->type) { | |
693 | case OSPF_IFTYPE_POINTOPOINT: | |
694 | links += lsa_link_ptop_set(s, oi); | |
695 | break; | |
696 | case OSPF_IFTYPE_BROADCAST: | |
697 | links += lsa_link_broadcast_set(s, oi); | |
698 | break; | |
699 | case OSPF_IFTYPE_NBMA: | |
700 | links += lsa_link_nbma_set(s, oi); | |
701 | break; | |
702 | case OSPF_IFTYPE_POINTOMULTIPOINT: | |
703 | links += lsa_link_ptomp_set(s, oi); | |
704 | break; | |
705 | case OSPF_IFTYPE_VIRTUALLINK: | |
706 | links += | |
707 | lsa_link_virtuallink_set(s, oi); | |
708 | break; | |
709 | case OSPF_IFTYPE_LOOPBACK: | |
710 | links += lsa_link_loopback_set(s, oi); | |
711 | } | |
712 | oi->lsa_pos_end = links; | |
713 | } | |
714 | } | |
715 | } | |
716 | ||
717 | return links; | |
718 | } | |
719 | ||
720 | /* Set router-LSA body. */ | |
721 | void ospf_router_lsa_body_set(struct stream **s, struct ospf_area *area) | |
722 | { | |
723 | unsigned long putp; | |
724 | uint16_t cnt; | |
725 | ||
726 | /* Set flags. */ | |
727 | stream_putc(*s, router_lsa_flags(area)); | |
728 | ||
729 | /* Set Zero fields. */ | |
730 | stream_putc(*s, 0); | |
731 | ||
732 | /* Keep pointer to # links. */ | |
733 | putp = stream_get_endp(*s); | |
734 | ||
735 | /* Forward word */ | |
736 | stream_putw(*s, 0); | |
737 | ||
738 | /* Set all link information. */ | |
739 | cnt = router_lsa_link_set(s, area); | |
740 | ||
741 | /* Set # of links here. */ | |
742 | stream_putw_at(*s, putp, cnt); | |
743 | } | |
744 | ||
745 | static void ospf_stub_router_timer(struct event *t) | |
746 | { | |
747 | struct ospf_area *area = EVENT_ARG(t); | |
748 | ||
749 | area->t_stub_router = NULL; | |
750 | ||
751 | SET_FLAG(area->stub_router_state, OSPF_AREA_WAS_START_STUB_ROUTED); | |
752 | ||
753 | /* clear stub route state and generate router-lsa refresh, don't | |
754 | * clobber an administratively set stub-router state though. | |
755 | */ | |
756 | if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_ADMIN_STUB_ROUTED)) | |
757 | return; | |
758 | ||
759 | UNSET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED); | |
760 | ||
761 | ospf_router_lsa_update_area(area); | |
762 | } | |
763 | ||
764 | static void ospf_stub_router_check(struct ospf_area *area) | |
765 | { | |
766 | /* area must either be administratively configured to be stub | |
767 | * or startup-time stub-router must be configured and we must in a | |
768 | * pre-stub | |
769 | * state. | |
770 | */ | |
771 | if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_ADMIN_STUB_ROUTED)) { | |
772 | SET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED); | |
773 | return; | |
774 | } | |
775 | ||
776 | /* not admin-stubbed, check whether startup stubbing is configured and | |
777 | * whether it's not been done yet | |
778 | */ | |
779 | if (CHECK_FLAG(area->stub_router_state, | |
780 | OSPF_AREA_WAS_START_STUB_ROUTED)) | |
781 | return; | |
782 | ||
783 | if (area->ospf->stub_router_startup_time | |
784 | == OSPF_STUB_ROUTER_UNCONFIGURED) { | |
785 | /* stub-router is hence done forever for this area, even if | |
786 | * someone | |
787 | * tries configure it (take effect next restart). | |
788 | */ | |
789 | SET_FLAG(area->stub_router_state, | |
790 | OSPF_AREA_WAS_START_STUB_ROUTED); | |
791 | return; | |
792 | } | |
793 | ||
794 | /* startup stub-router configured and not yet done */ | |
795 | SET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED); | |
796 | ||
797 | OSPF_AREA_TIMER_ON(area->t_stub_router, ospf_stub_router_timer, | |
798 | area->ospf->stub_router_startup_time); | |
799 | } | |
800 | ||
801 | /* Create new router-LSA. */ | |
802 | static struct ospf_lsa *ospf_router_lsa_new(struct ospf_area *area) | |
803 | { | |
804 | struct ospf *ospf = area->ospf; | |
805 | struct stream *s; | |
806 | struct lsa_header *lsah; | |
807 | struct ospf_lsa *new; | |
808 | int length; | |
809 | ||
810 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
811 | zlog_debug("LSA[Type1]: Create router-LSA instance"); | |
812 | ||
813 | /* check whether stub-router is desired, and if this is the first | |
814 | * router LSA. | |
815 | */ | |
816 | ospf_stub_router_check(area); | |
817 | ||
818 | /* Create a stream for LSA. */ | |
819 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
820 | /* Set LSA common header fields. */ | |
821 | lsa_header_set(s, LSA_OPTIONS_GET(area) | LSA_OPTIONS_NSSA_GET(area), | |
822 | OSPF_ROUTER_LSA, ospf->router_id, ospf->router_id); | |
823 | ||
824 | /* Set router-LSA body fields. */ | |
825 | ospf_router_lsa_body_set(&s, area); | |
826 | ||
827 | /* Set length. */ | |
828 | length = stream_get_endp(s); | |
829 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
830 | lsah->length = htons(length); | |
831 | ||
832 | /* Now, create OSPF LSA instance. */ | |
833 | new = ospf_lsa_new_and_data(length); | |
834 | ||
835 | new->area = area; | |
836 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
837 | new->vrf_id = area->ospf->vrf_id; | |
838 | ||
839 | /* Copy LSA data to store, discard stream. */ | |
840 | memcpy(new->data, lsah, length); | |
841 | stream_free(s); | |
842 | ||
843 | return new; | |
844 | } | |
845 | ||
846 | /* Originate Router-LSA. */ | |
847 | static struct ospf_lsa *ospf_router_lsa_originate(struct ospf_area *area) | |
848 | { | |
849 | struct ospf_lsa *new; | |
850 | ||
851 | if (area->ospf->gr_info.restart_in_progress) { | |
852 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
853 | zlog_debug( | |
854 | "LSA[Type%d]: Graceful Restart in progress, don't originate", | |
855 | OSPF_ROUTER_LSA); | |
856 | return NULL; | |
857 | } | |
858 | ||
859 | /* Create new router-LSA instance. */ | |
860 | if ((new = ospf_router_lsa_new(area)) == NULL) { | |
861 | zlog_err("%s: ospf_router_lsa_new returned NULL", __func__); | |
862 | return NULL; | |
863 | } | |
864 | ||
865 | /* Sanity check. */ | |
866 | if (new->data->adv_router.s_addr == INADDR_ANY) { | |
867 | if (IS_DEBUG_OSPF_EVENT) | |
868 | zlog_debug("LSA[Type1]: AdvRouter is 0, discard"); | |
869 | ospf_lsa_discard(new); | |
870 | return NULL; | |
871 | } | |
872 | ||
873 | /* Install LSA to LSDB. */ | |
874 | new = ospf_lsa_install(area->ospf, NULL, new); | |
875 | ||
876 | /* Update LSA origination count. */ | |
877 | area->ospf->lsa_originate_count++; | |
878 | ||
879 | /* Flooding new LSA through area. */ | |
880 | ospf_flood_through_area(area, NULL, new); | |
881 | ||
882 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
883 | zlog_debug("LSA[Type%d:%pI4]: Originate router-LSA %p", | |
884 | new->data->type, &new->data->id, | |
885 | (void *)new); | |
886 | ospf_lsa_header_dump(new->data); | |
887 | } | |
888 | ||
889 | return new; | |
890 | } | |
891 | ||
892 | /* Refresh router-LSA. */ | |
893 | static struct ospf_lsa *ospf_router_lsa_refresh(struct ospf_lsa *lsa) | |
894 | { | |
895 | struct ospf_area *area = lsa->area; | |
896 | struct ospf_lsa *new; | |
897 | ||
898 | /* Sanity check. */ | |
899 | assert(lsa->data); | |
900 | ||
901 | /* Delete LSA from neighbor retransmit-list. */ | |
902 | ospf_ls_retransmit_delete_nbr_area(area, lsa); | |
903 | ||
904 | /* Unregister LSA from refresh-list */ | |
905 | ospf_refresher_unregister_lsa(area->ospf, lsa); | |
906 | ||
907 | /* Create new router-LSA instance. */ | |
908 | if ((new = ospf_router_lsa_new(area)) == NULL) { | |
909 | zlog_err("%s: ospf_router_lsa_new returned NULL", __func__); | |
910 | return NULL; | |
911 | } | |
912 | ||
913 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
914 | ||
915 | ospf_lsa_install(area->ospf, NULL, new); | |
916 | ||
917 | /* Flood LSA through area. */ | |
918 | ospf_flood_through_area(area, NULL, new); | |
919 | ||
920 | /* Debug logging. */ | |
921 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
922 | zlog_debug("LSA[Type%d:%pI4]: router-LSA refresh", | |
923 | new->data->type, &new->data->id); | |
924 | ospf_lsa_header_dump(new->data); | |
925 | } | |
926 | ||
927 | return NULL; | |
928 | } | |
929 | ||
930 | int ospf_router_lsa_update_area(struct ospf_area *area) | |
931 | { | |
932 | if (IS_DEBUG_OSPF_EVENT) | |
933 | zlog_debug("[router-LSA]: (router-LSA area update)"); | |
934 | ||
935 | /* Now refresh router-LSA. */ | |
936 | if (area->router_lsa_self) | |
937 | ospf_lsa_refresh(area->ospf, area->router_lsa_self); | |
938 | /* Newly originate router-LSA. */ | |
939 | else | |
940 | ospf_router_lsa_originate(area); | |
941 | ||
942 | return 0; | |
943 | } | |
944 | ||
945 | int ospf_router_lsa_update(struct ospf *ospf) | |
946 | { | |
947 | struct listnode *node, *nnode; | |
948 | struct ospf_area *area; | |
949 | ||
950 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
951 | zlog_debug("Timer[router-LSA Update]: (timer expire)"); | |
952 | ||
953 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
954 | struct ospf_lsa *lsa = area->router_lsa_self; | |
955 | struct router_lsa *rl; | |
956 | const char *area_str; | |
957 | ||
958 | /* Keep Area ID string. */ | |
959 | area_str = AREA_NAME(area); | |
960 | ||
961 | /* If LSA not exist in this Area, originate new. */ | |
962 | if (lsa == NULL) { | |
963 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
964 | zlog_debug( | |
965 | "LSA[Type1]: Create router-LSA for Area %s", | |
966 | area_str); | |
967 | ||
968 | ospf_router_lsa_originate(area); | |
969 | } | |
970 | /* If router-ID is changed, Link ID must change. | |
971 | First flush old LSA, then originate new. */ | |
972 | else if (!IPV4_ADDR_SAME(&lsa->data->id, &ospf->router_id)) { | |
973 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
974 | zlog_debug( | |
975 | "LSA[Type%d:%pI4]: Refresh router-LSA for Area %s", | |
976 | lsa->data->type, | |
977 | &lsa->data->id, area_str); | |
978 | ospf_refresher_unregister_lsa(ospf, lsa); | |
979 | ospf_lsa_flush_area(lsa, area); | |
980 | ospf_lsa_unlock(&area->router_lsa_self); | |
981 | area->router_lsa_self = NULL; | |
982 | ||
983 | /* Refresh router-LSA, (not install) and flood through | |
984 | * area. */ | |
985 | ospf_router_lsa_update_area(area); | |
986 | } else { | |
987 | rl = (struct router_lsa *)lsa->data; | |
988 | /* Refresh router-LSA, (not install) and flood through | |
989 | * area. */ | |
990 | if (rl->flags != ospf->flags) | |
991 | ospf_router_lsa_update_area(area); | |
992 | } | |
993 | } | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | ||
999 | /* network-LSA related functions. */ | |
1000 | /* Originate Network-LSA. */ | |
1001 | static void ospf_network_lsa_body_set(struct stream *s, | |
1002 | struct ospf_interface *oi) | |
1003 | { | |
1004 | struct in_addr mask; | |
1005 | struct route_node *rn; | |
1006 | struct ospf_neighbor *nbr; | |
1007 | ||
1008 | masklen2ip(oi->address->prefixlen, &mask); | |
1009 | stream_put_ipv4(s, mask.s_addr); | |
1010 | ||
1011 | /* The network-LSA lists those routers that are fully adjacent to | |
1012 | the Designated Router; each fully adjacent router is identified by | |
1013 | its OSPF Router ID. The Designated Router includes itself in this | |
1014 | list. RFC2328, Section 12.4.2 */ | |
1015 | ||
1016 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
1017 | if ((nbr = rn->info) != NULL) | |
1018 | if (nbr->state == NSM_Full || nbr == oi->nbr_self) | |
1019 | stream_put_ipv4(s, nbr->router_id.s_addr); | |
1020 | } | |
1021 | ||
1022 | static struct ospf_lsa *ospf_network_lsa_new(struct ospf_interface *oi) | |
1023 | { | |
1024 | struct stream *s; | |
1025 | struct ospf_lsa *new; | |
1026 | struct lsa_header *lsah; | |
1027 | struct ospf_if_params *oip; | |
1028 | int length; | |
1029 | ||
1030 | /* If there are no neighbours on this network (the net is stub), | |
1031 | the router does not originate network-LSA (see RFC 12.4.2) */ | |
1032 | if (oi->full_nbrs == 0) | |
1033 | return NULL; | |
1034 | ||
1035 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1036 | zlog_debug("LSA[Type2]: Create network-LSA instance"); | |
1037 | ||
1038 | /* Create new stream for LSA. */ | |
1039 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1040 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
1041 | ||
1042 | lsa_header_set(s, (OPTIONS(oi) | LSA_OPTIONS_GET(oi->area)), | |
1043 | OSPF_NETWORK_LSA, DR(oi), oi->ospf->router_id); | |
1044 | ||
1045 | /* Set network-LSA body fields. */ | |
1046 | ospf_network_lsa_body_set(s, oi); | |
1047 | ||
1048 | /* Set length. */ | |
1049 | length = stream_get_endp(s); | |
1050 | lsah->length = htons(length); | |
1051 | ||
1052 | /* Create OSPF LSA instance. */ | |
1053 | new = ospf_lsa_new_and_data(length); | |
1054 | ||
1055 | new->area = oi->area; | |
1056 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
1057 | new->vrf_id = oi->ospf->vrf_id; | |
1058 | ||
1059 | /* Copy LSA to store. */ | |
1060 | memcpy(new->data, lsah, length); | |
1061 | stream_free(s); | |
1062 | ||
1063 | /* Remember prior network LSA sequence numbers, even if we stop | |
1064 | * originating one for this oi, to try avoid re-originating LSAs with a | |
1065 | * prior sequence number, and thus speed up adjency forming & | |
1066 | * convergence. | |
1067 | */ | |
1068 | if ((oip = ospf_lookup_if_params(oi->ifp, oi->address->u.prefix4))) { | |
1069 | new->data->ls_seqnum = oip->network_lsa_seqnum; | |
1070 | new->data->ls_seqnum = lsa_seqnum_increment(new); | |
1071 | } else { | |
1072 | oip = ospf_get_if_params(oi->ifp, oi->address->u.prefix4); | |
1073 | ospf_if_update_params(oi->ifp, oi->address->u.prefix4); | |
1074 | } | |
1075 | oip->network_lsa_seqnum = new->data->ls_seqnum; | |
1076 | ||
1077 | return new; | |
1078 | } | |
1079 | ||
1080 | /* Originate network-LSA. */ | |
1081 | void ospf_network_lsa_update(struct ospf_interface *oi) | |
1082 | { | |
1083 | struct ospf_lsa *new; | |
1084 | ||
1085 | if (oi->area->ospf->gr_info.restart_in_progress) { | |
1086 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1087 | zlog_debug( | |
1088 | "LSA[Type%d]: Graceful Restart in progress, don't originate", | |
1089 | OSPF_NETWORK_LSA); | |
1090 | return; | |
1091 | } | |
1092 | ||
1093 | if (oi->network_lsa_self != NULL) { | |
1094 | ospf_lsa_refresh(oi->ospf, oi->network_lsa_self); | |
1095 | return; | |
1096 | } | |
1097 | ||
1098 | /* Create new network-LSA instance. */ | |
1099 | new = ospf_network_lsa_new(oi); | |
1100 | if (new == NULL) | |
1101 | return; | |
1102 | ||
1103 | /* Install LSA to LSDB. */ | |
1104 | new = ospf_lsa_install(oi->ospf, oi, new); | |
1105 | ||
1106 | /* Update LSA origination count. */ | |
1107 | oi->ospf->lsa_originate_count++; | |
1108 | ||
1109 | /* Flooding new LSA through area. */ | |
1110 | ospf_flood_through_area(oi->area, NULL, new); | |
1111 | ||
1112 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1113 | zlog_debug("LSA[Type%d:%pI4]: Originate network-LSA %p", | |
1114 | new->data->type, &new->data->id, | |
1115 | (void *)new); | |
1116 | ospf_lsa_header_dump(new->data); | |
1117 | } | |
1118 | ||
1119 | return; | |
1120 | } | |
1121 | ||
1122 | static struct ospf_lsa *ospf_network_lsa_refresh(struct ospf_lsa *lsa) | |
1123 | { | |
1124 | struct ospf_area *area = lsa->area; | |
1125 | struct ospf_lsa *new, *new2; | |
1126 | struct ospf_if_params *oip; | |
1127 | struct ospf_interface *oi; | |
1128 | ||
1129 | assert(lsa->data); | |
1130 | ||
1131 | /* Retrieve the oi for the network LSA */ | |
1132 | oi = ospf_if_lookup_by_local_addr(area->ospf, NULL, lsa->data->id); | |
1133 | if (oi == NULL) { | |
1134 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1135 | zlog_debug( | |
1136 | "LSA[Type%d:%pI4]: network-LSA refresh: no oi found, ick, ignoring.", | |
1137 | lsa->data->type, &lsa->data->id); | |
1138 | ospf_lsa_header_dump(lsa->data); | |
1139 | } | |
1140 | return NULL; | |
1141 | } | |
1142 | ||
1143 | if (oi->state != ISM_DR) | |
1144 | return NULL; | |
1145 | ||
1146 | /* Delete LSA from neighbor retransmit-list. */ | |
1147 | ospf_ls_retransmit_delete_nbr_area(area, lsa); | |
1148 | ||
1149 | /* Unregister LSA from refresh-list */ | |
1150 | ospf_refresher_unregister_lsa(area->ospf, lsa); | |
1151 | ||
1152 | /* Create new network-LSA instance. */ | |
1153 | new = ospf_network_lsa_new(oi); | |
1154 | if (new == NULL) | |
1155 | return NULL; | |
1156 | ||
1157 | oip = ospf_lookup_if_params(oi->ifp, oi->address->u.prefix4); | |
1158 | assert(oip != NULL); | |
1159 | oip->network_lsa_seqnum = new->data->ls_seqnum = | |
1160 | lsa_seqnum_increment(lsa); | |
1161 | ||
1162 | new2 = ospf_lsa_install(area->ospf, oi, new); | |
1163 | ||
1164 | assert(new2 == new); | |
1165 | ||
1166 | /* Flood LSA through aera. */ | |
1167 | ospf_flood_through_area(area, NULL, new); | |
1168 | ||
1169 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1170 | zlog_debug("LSA[Type%d:%pI4]: network-LSA refresh", | |
1171 | new->data->type, &new->data->id); | |
1172 | ospf_lsa_header_dump(new->data); | |
1173 | } | |
1174 | ||
1175 | return new; | |
1176 | } | |
1177 | ||
1178 | static void stream_put_ospf_metric(struct stream *s, uint32_t metric_value) | |
1179 | { | |
1180 | uint32_t metric; | |
1181 | char *mp; | |
1182 | ||
1183 | /* Put 0 metric. TOS metric is not supported. */ | |
1184 | metric = htonl(metric_value); | |
1185 | mp = (char *)&metric; | |
1186 | mp++; | |
1187 | stream_put(s, mp, 3); | |
1188 | } | |
1189 | ||
1190 | /* summary-LSA related functions. */ | |
1191 | static void ospf_summary_lsa_body_set(struct stream *s, struct prefix *p, | |
1192 | uint32_t metric) | |
1193 | { | |
1194 | struct in_addr mask; | |
1195 | ||
1196 | masklen2ip(p->prefixlen, &mask); | |
1197 | ||
1198 | /* Put Network Mask. */ | |
1199 | stream_put_ipv4(s, mask.s_addr); | |
1200 | ||
1201 | /* Set # TOS. */ | |
1202 | stream_putc(s, (uint8_t)0); | |
1203 | ||
1204 | /* Set metric. */ | |
1205 | stream_put_ospf_metric(s, metric); | |
1206 | } | |
1207 | ||
1208 | static struct ospf_lsa *ospf_summary_lsa_new(struct ospf_area *area, | |
1209 | struct prefix *p, uint32_t metric, | |
1210 | struct in_addr id) | |
1211 | { | |
1212 | struct stream *s; | |
1213 | struct ospf_lsa *new; | |
1214 | struct lsa_header *lsah; | |
1215 | int length; | |
1216 | ||
1217 | if (id.s_addr == 0xffffffff) { | |
1218 | /* Maybe Link State ID not available. */ | |
1219 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1220 | zlog_debug( | |
1221 | "LSA[Type%d]: Link ID not available, can't originate", | |
1222 | OSPF_SUMMARY_LSA); | |
1223 | return NULL; | |
1224 | } | |
1225 | ||
1226 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1227 | zlog_debug("LSA[Type3]: Create summary-LSA instance"); | |
1228 | ||
1229 | /* Create new stream for LSA. */ | |
1230 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1231 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
1232 | ||
1233 | lsa_header_set(s, LSA_OPTIONS_GET(area), OSPF_SUMMARY_LSA, id, | |
1234 | area->ospf->router_id); | |
1235 | ||
1236 | /* Set summary-LSA body fields. */ | |
1237 | ospf_summary_lsa_body_set(s, p, metric); | |
1238 | ||
1239 | /* Set length. */ | |
1240 | length = stream_get_endp(s); | |
1241 | lsah->length = htons(length); | |
1242 | ||
1243 | /* Create OSPF LSA instance. */ | |
1244 | new = ospf_lsa_new_and_data(length); | |
1245 | new->area = area; | |
1246 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
1247 | new->vrf_id = area->ospf->vrf_id; | |
1248 | ||
1249 | /* Copy LSA to store. */ | |
1250 | memcpy(new->data, lsah, length); | |
1251 | stream_free(s); | |
1252 | ||
1253 | return new; | |
1254 | } | |
1255 | ||
1256 | /* Originate Summary-LSA. */ | |
1257 | static struct ospf_lsa * | |
1258 | ospf_summary_lsa_prepare_and_flood(struct prefix_ipv4 *p, uint32_t metric, | |
1259 | struct ospf_area *area, struct in_addr id) | |
1260 | { | |
1261 | struct ospf_lsa *new; | |
1262 | ||
1263 | /* Create new summary-LSA instance. */ | |
1264 | if (!(new = ospf_summary_lsa_new(area, (struct prefix *)p, metric, id))) | |
1265 | return NULL; | |
1266 | ||
1267 | /* Instlal LSA to LSDB. */ | |
1268 | new = ospf_lsa_install(area->ospf, NULL, new); | |
1269 | ||
1270 | /* Update LSA origination count. */ | |
1271 | area->ospf->lsa_originate_count++; | |
1272 | ||
1273 | /* Flooding new LSA through area. */ | |
1274 | ospf_flood_through_area(area, NULL, new); | |
1275 | ||
1276 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1277 | zlog_debug("LSA[Type%d:%pI4]: Originate summary-LSA %p", | |
1278 | new->data->type, &new->data->id, | |
1279 | (void *)new); | |
1280 | ospf_lsa_header_dump(new->data); | |
1281 | } | |
1282 | ||
1283 | return new; | |
1284 | } | |
1285 | ||
1286 | static struct ospf_lsa *ospf_handle_summarylsa_lsId_chg(struct ospf_area *area, | |
1287 | struct prefix_ipv4 *p, | |
1288 | uint8_t type, | |
1289 | uint32_t metric, | |
1290 | struct in_addr old_id) | |
1291 | { | |
1292 | struct ospf_lsa *lsa = NULL; | |
1293 | struct ospf_lsa *summary_lsa = NULL; | |
1294 | struct summary_lsa *sl = NULL; | |
1295 | struct ospf_area *old_area = NULL; | |
1296 | struct ospf *ospf = area->ospf; | |
1297 | struct prefix_ipv4 old_prefix; | |
1298 | uint32_t old_metric; | |
1299 | struct in_addr mask; | |
1300 | uint32_t metric_val; | |
1301 | char *metric_buf; | |
1302 | ||
1303 | lsa = ospf_lsdb_lookup_by_id(area->lsdb, type, p->prefix, | |
1304 | ospf->router_id); | |
1305 | ||
1306 | if (!lsa) { | |
1307 | flog_warn(EC_OSPF_LSA_NULL, "(%s): LSA not found", __func__); | |
1308 | return NULL; | |
1309 | } | |
1310 | ||
1311 | sl = (struct summary_lsa *)lsa->data; | |
1312 | ||
1313 | old_area = lsa->area; | |
1314 | old_metric = GET_METRIC(sl->metric); | |
1315 | old_prefix.prefix = sl->header.id; | |
1316 | old_prefix.prefixlen = ip_masklen(sl->mask); | |
1317 | old_prefix.family = AF_INET; | |
1318 | ||
1319 | ||
1320 | /* change the mask */ | |
1321 | masklen2ip(p->prefixlen, &mask); | |
1322 | sl->mask.s_addr = mask.s_addr; | |
1323 | ||
1324 | /* Copy the metric*/ | |
1325 | metric_val = htonl(metric); | |
1326 | metric_buf = (char *)&metric_val; | |
1327 | memcpy(sl->metric, metric_buf, sizeof(metric_val)); | |
1328 | ||
1329 | if (type == OSPF_SUMMARY_LSA) { | |
1330 | /*Refresh the LSA with new LSA*/ | |
1331 | summary_lsa = ospf_summary_lsa_refresh(ospf, lsa); | |
1332 | ||
1333 | ospf_summary_lsa_prepare_and_flood(&old_prefix, old_metric, | |
1334 | old_area, old_id); | |
1335 | } else { | |
1336 | /*Refresh the LSA with new LSA*/ | |
1337 | summary_lsa = ospf_summary_asbr_lsa_refresh(ospf, lsa); | |
1338 | ||
1339 | ospf_asbr_summary_lsa_prepare_and_flood(&old_prefix, old_metric, | |
1340 | old_area, old_id); | |
1341 | } | |
1342 | ||
1343 | return summary_lsa; | |
1344 | } | |
1345 | ||
1346 | /* Originate Summary-LSA. */ | |
1347 | struct ospf_lsa *ospf_summary_lsa_originate(struct prefix_ipv4 *p, | |
1348 | uint32_t metric, | |
1349 | struct ospf_area *area) | |
1350 | { | |
1351 | struct in_addr id; | |
1352 | enum lsid_status status; | |
1353 | struct ospf_lsa *new = NULL; | |
1354 | ||
1355 | status = ospf_lsa_unique_id(area->ospf, area->lsdb, OSPF_SUMMARY_LSA, p, | |
1356 | &id); | |
1357 | ||
1358 | if (status == LSID_CHANGE) { | |
1359 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1360 | zlog_debug("Link ID has to be changed."); | |
1361 | ||
1362 | new = ospf_handle_summarylsa_lsId_chg(area, p, OSPF_SUMMARY_LSA, | |
1363 | metric, id); | |
1364 | return new; | |
1365 | } else if (status == LSID_NOT_AVAILABLE) { | |
1366 | /* Link State ID not available. */ | |
1367 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1368 | zlog_debug( | |
1369 | "LSA[Type5]: Link ID not available, can't originate"); | |
1370 | ||
1371 | return NULL; | |
1372 | } | |
1373 | ||
1374 | new = ospf_summary_lsa_prepare_and_flood(p, metric, area, id); | |
1375 | return new; | |
1376 | } | |
1377 | ||
1378 | static struct ospf_lsa *ospf_summary_lsa_refresh(struct ospf *ospf, | |
1379 | struct ospf_lsa *lsa) | |
1380 | { | |
1381 | struct ospf_lsa *new; | |
1382 | struct summary_lsa *sl; | |
1383 | struct prefix p; | |
1384 | ||
1385 | /* Sanity check. */ | |
1386 | assert(lsa->data); | |
1387 | ||
1388 | sl = (struct summary_lsa *)lsa->data; | |
1389 | p.prefixlen = ip_masklen(sl->mask); | |
1390 | new = ospf_summary_lsa_new(lsa->area, &p, GET_METRIC(sl->metric), | |
1391 | sl->header.id); | |
1392 | ||
1393 | if (!new) | |
1394 | return NULL; | |
1395 | ||
1396 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
1397 | ||
1398 | ospf_lsa_install(ospf, NULL, new); | |
1399 | ||
1400 | /* Flood LSA through AS. */ | |
1401 | ospf_flood_through_area(new->area, NULL, new); | |
1402 | ||
1403 | /* Debug logging. */ | |
1404 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1405 | zlog_debug("LSA[Type%d:%pI4]: summary-LSA refresh", | |
1406 | new->data->type, &new->data->id); | |
1407 | ospf_lsa_header_dump(new->data); | |
1408 | } | |
1409 | ||
1410 | return new; | |
1411 | } | |
1412 | ||
1413 | ||
1414 | /* summary-ASBR-LSA related functions. */ | |
1415 | static void ospf_summary_asbr_lsa_body_set(struct stream *s, struct prefix *p, | |
1416 | uint32_t metric) | |
1417 | { | |
1418 | /* Put Network Mask. */ | |
1419 | stream_put_ipv4(s, (uint32_t)0); | |
1420 | ||
1421 | /* Set # TOS. */ | |
1422 | stream_putc(s, (uint8_t)0); | |
1423 | ||
1424 | /* Set metric. */ | |
1425 | stream_put_ospf_metric(s, metric); | |
1426 | } | |
1427 | ||
1428 | static struct ospf_lsa *ospf_summary_asbr_lsa_new(struct ospf_area *area, | |
1429 | struct prefix *p, | |
1430 | uint32_t metric, | |
1431 | struct in_addr id) | |
1432 | { | |
1433 | struct stream *s; | |
1434 | struct ospf_lsa *new; | |
1435 | struct lsa_header *lsah; | |
1436 | int length; | |
1437 | ||
1438 | if (id.s_addr == 0xffffffff) { | |
1439 | /* Maybe Link State ID not available. */ | |
1440 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1441 | zlog_debug( | |
1442 | "LSA[Type%d]: Link ID not available, can't originate", | |
1443 | OSPF_ASBR_SUMMARY_LSA); | |
1444 | return NULL; | |
1445 | } | |
1446 | ||
1447 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1448 | zlog_debug("LSA[Type3]: Create summary-LSA instance"); | |
1449 | ||
1450 | /* Create new stream for LSA. */ | |
1451 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1452 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
1453 | ||
1454 | lsa_header_set(s, LSA_OPTIONS_GET(area), OSPF_ASBR_SUMMARY_LSA, id, | |
1455 | area->ospf->router_id); | |
1456 | ||
1457 | /* Set summary-LSA body fields. */ | |
1458 | ospf_summary_asbr_lsa_body_set(s, p, metric); | |
1459 | ||
1460 | /* Set length. */ | |
1461 | length = stream_get_endp(s); | |
1462 | lsah->length = htons(length); | |
1463 | ||
1464 | /* Create OSPF LSA instance. */ | |
1465 | new = ospf_lsa_new_and_data(length); | |
1466 | new->area = area; | |
1467 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
1468 | new->vrf_id = area->ospf->vrf_id; | |
1469 | ||
1470 | /* Copy LSA to store. */ | |
1471 | memcpy(new->data, lsah, length); | |
1472 | stream_free(s); | |
1473 | ||
1474 | return new; | |
1475 | } | |
1476 | ||
1477 | /* Originate summary-ASBR-LSA. */ | |
1478 | static struct ospf_lsa * | |
1479 | ospf_asbr_summary_lsa_prepare_and_flood(struct prefix_ipv4 *p, uint32_t metric, | |
1480 | struct ospf_area *area, | |
1481 | struct in_addr id) | |
1482 | { | |
1483 | struct ospf_lsa *new; | |
1484 | ||
1485 | /* Create new summary-LSA instance. */ | |
1486 | new = ospf_summary_asbr_lsa_new(area, (struct prefix *)p, metric, id); | |
1487 | if (!new) | |
1488 | return NULL; | |
1489 | ||
1490 | /* Install LSA to LSDB. */ | |
1491 | new = ospf_lsa_install(area->ospf, NULL, new); | |
1492 | ||
1493 | /* Update LSA origination count. */ | |
1494 | area->ospf->lsa_originate_count++; | |
1495 | ||
1496 | /* Flooding new LSA through area. */ | |
1497 | ospf_flood_through_area(area, NULL, new); | |
1498 | ||
1499 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1500 | zlog_debug("LSA[Type%d:%pI4]: Originate summary-ASBR-LSA %p", | |
1501 | new->data->type, &new->data->id, | |
1502 | (void *)new); | |
1503 | ospf_lsa_header_dump(new->data); | |
1504 | } | |
1505 | ||
1506 | return new; | |
1507 | } | |
1508 | ||
1509 | struct ospf_lsa *ospf_summary_asbr_lsa_originate(struct prefix_ipv4 *p, | |
1510 | uint32_t metric, | |
1511 | struct ospf_area *area) | |
1512 | { | |
1513 | struct ospf_lsa *new; | |
1514 | struct in_addr id; | |
1515 | enum lsid_status status; | |
1516 | ||
1517 | status = ospf_lsa_unique_id(area->ospf, area->lsdb, | |
1518 | OSPF_ASBR_SUMMARY_LSA, p, &id); | |
1519 | ||
1520 | if (status == LSID_CHANGE) { | |
1521 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1522 | zlog_debug("Link ID has to be changed."); | |
1523 | ||
1524 | new = ospf_handle_summarylsa_lsId_chg( | |
1525 | area, p, OSPF_ASBR_SUMMARY_LSA, metric, id); | |
1526 | return new; | |
1527 | } else if (status == LSID_NOT_AVAILABLE) { | |
1528 | /* Link State ID not available. */ | |
1529 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1530 | zlog_debug( | |
1531 | "LSA[Type5]: Link ID not available, can't originate"); | |
1532 | ||
1533 | return NULL; | |
1534 | } | |
1535 | ||
1536 | new = ospf_asbr_summary_lsa_prepare_and_flood(p, metric, area, id); | |
1537 | return new; | |
1538 | } | |
1539 | ||
1540 | static struct ospf_lsa *ospf_summary_asbr_lsa_refresh(struct ospf *ospf, | |
1541 | struct ospf_lsa *lsa) | |
1542 | { | |
1543 | struct ospf_lsa *new; | |
1544 | struct summary_lsa *sl; | |
1545 | struct prefix p; | |
1546 | bool ind_lsa = false; | |
1547 | ||
1548 | /* Sanity check. */ | |
1549 | assert(lsa->data); | |
1550 | ||
1551 | if (lsa->area->fr_info.indication_lsa_self && | |
1552 | (lsa->area->fr_info.indication_lsa_self == lsa)) | |
1553 | ind_lsa = true; | |
1554 | ||
1555 | sl = (struct summary_lsa *)lsa->data; | |
1556 | p.prefixlen = ip_masklen(sl->mask); | |
1557 | new = ospf_summary_asbr_lsa_new(lsa->area, &p, GET_METRIC(sl->metric), | |
1558 | sl->header.id); | |
1559 | if (!new) | |
1560 | return NULL; | |
1561 | ||
1562 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
1563 | ||
1564 | ospf_lsa_install(ospf, NULL, new); | |
1565 | ||
1566 | /* Flood LSA through area. */ | |
1567 | ospf_flood_through_area(new->area, NULL, new); | |
1568 | ||
1569 | if (ind_lsa) | |
1570 | new->area->fr_info.indication_lsa_self = new; | |
1571 | ||
1572 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1573 | zlog_debug("LSA[Type%d:%pI4]: summary-ASBR-LSA refresh", | |
1574 | new->data->type, &new->data->id); | |
1575 | ospf_lsa_header_dump(new->data); | |
1576 | } | |
1577 | ||
1578 | return new; | |
1579 | } | |
1580 | ||
1581 | /* AS-external-LSA related functions. */ | |
1582 | ||
1583 | /* Get nexthop for AS-external-LSAs. Return nexthop if its interface | |
1584 | is connected, else 0*/ | |
1585 | static struct in_addr ospf_external_lsa_nexthop_get(struct ospf *ospf, | |
1586 | struct in_addr nexthop) | |
1587 | { | |
1588 | struct in_addr fwd; | |
1589 | struct prefix nh; | |
1590 | struct listnode *node; | |
1591 | struct ospf_interface *oi; | |
1592 | ||
1593 | fwd.s_addr = 0; | |
1594 | ||
1595 | if (!nexthop.s_addr) | |
1596 | return fwd; | |
1597 | ||
1598 | /* Check whether nexthop is covered by OSPF network. */ | |
1599 | nh.family = AF_INET; | |
1600 | nh.u.prefix4 = nexthop; | |
1601 | nh.prefixlen = IPV4_MAX_BITLEN; | |
1602 | ||
1603 | /* XXX/SCALE: If there were a lot of oi's on an ifp, then it'd be | |
1604 | * better to make use of the per-ifp table of ois. | |
1605 | */ | |
1606 | for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) | |
1607 | if (if_is_operative(oi->ifp)) | |
1608 | if (oi->address->family == AF_INET) | |
1609 | if (prefix_match(oi->address, &nh)) | |
1610 | return nexthop; | |
1611 | ||
1612 | return fwd; | |
1613 | } | |
1614 | ||
1615 | /* NSSA-external-LSA related functions. */ | |
1616 | ||
1617 | /* Get 1st IP connection for Forward Addr */ | |
1618 | ||
1619 | struct in_addr ospf_get_ip_from_ifp(struct ospf_interface *oi) | |
1620 | { | |
1621 | struct in_addr fwd; | |
1622 | ||
1623 | fwd.s_addr = INADDR_ANY; | |
1624 | ||
1625 | if (if_is_operative(oi->ifp)) | |
1626 | return oi->address->u.prefix4; | |
1627 | ||
1628 | return fwd; | |
1629 | } | |
1630 | ||
1631 | /* Get 1st IP connection for Forward Addr */ | |
1632 | struct in_addr ospf_get_nssa_ip(struct ospf_area *area) | |
1633 | { | |
1634 | struct in_addr fwd; | |
1635 | struct in_addr best_default; | |
1636 | struct listnode *node; | |
1637 | struct ospf_interface *oi; | |
1638 | ||
1639 | fwd.s_addr = 0; | |
1640 | best_default.s_addr = 0; | |
1641 | ||
1642 | for (ALL_LIST_ELEMENTS_RO(area->ospf->oiflist, node, oi)) { | |
1643 | if (if_is_operative(oi->ifp)) | |
1644 | if (oi->area->external_routing == OSPF_AREA_NSSA) | |
1645 | if (oi->address | |
1646 | && oi->address->family == AF_INET) { | |
1647 | if (best_default.s_addr == INADDR_ANY) | |
1648 | best_default = | |
1649 | oi->address->u.prefix4; | |
1650 | if (oi->area == area) | |
1651 | return oi->address->u.prefix4; | |
1652 | } | |
1653 | } | |
1654 | if (best_default.s_addr != INADDR_ANY) | |
1655 | return best_default; | |
1656 | ||
1657 | if (best_default.s_addr != INADDR_ANY) | |
1658 | return best_default; | |
1659 | ||
1660 | return fwd; | |
1661 | } | |
1662 | ||
1663 | int metric_type(struct ospf *ospf, uint8_t src, unsigned short instance) | |
1664 | { | |
1665 | struct ospf_redist *red; | |
1666 | ||
1667 | red = ospf_redist_lookup(ospf, src, instance); | |
1668 | ||
1669 | return ((!red || red->dmetric.type < 0) ? DEFAULT_METRIC_TYPE | |
1670 | : red->dmetric.type); | |
1671 | } | |
1672 | ||
1673 | int metric_value(struct ospf *ospf, uint8_t src, unsigned short instance) | |
1674 | { | |
1675 | struct ospf_redist *red; | |
1676 | ||
1677 | red = ospf_redist_lookup(ospf, src, instance); | |
1678 | if (!red || red->dmetric.value < 0) { | |
1679 | if (src == DEFAULT_ROUTE) { | |
1680 | if (ospf->default_originate == DEFAULT_ORIGINATE_ZEBRA) | |
1681 | return DEFAULT_DEFAULT_ORIGINATE_METRIC; | |
1682 | else | |
1683 | return DEFAULT_DEFAULT_ALWAYS_METRIC; | |
1684 | } else if (ospf->default_metric < 0) | |
1685 | return DEFAULT_DEFAULT_METRIC; | |
1686 | else | |
1687 | return ospf->default_metric; | |
1688 | } | |
1689 | ||
1690 | return red->dmetric.value; | |
1691 | } | |
1692 | ||
1693 | /* Set AS-external-LSA body. */ | |
1694 | static void ospf_external_lsa_body_set(struct stream *s, | |
1695 | struct external_info *ei, | |
1696 | struct ospf *ospf) | |
1697 | { | |
1698 | struct prefix_ipv4 *p = &ei->p; | |
1699 | struct in_addr mask, fwd_addr; | |
1700 | uint32_t mvalue; | |
1701 | int mtype; | |
1702 | int type; | |
1703 | unsigned short instance; | |
1704 | ||
1705 | /* Put Network Mask. */ | |
1706 | masklen2ip(p->prefixlen, &mask); | |
1707 | stream_put_ipv4(s, mask.s_addr); | |
1708 | ||
1709 | /* If prefix is default, specify DEFAULT_ROUTE. */ | |
1710 | type = is_default_prefix4(&ei->p) ? DEFAULT_ROUTE : ei->type; | |
1711 | instance = is_default_prefix4(&ei->p) ? 0 : ei->instance; | |
1712 | ||
1713 | mtype = (ROUTEMAP_METRIC_TYPE(ei) != -1) | |
1714 | ? ROUTEMAP_METRIC_TYPE(ei) | |
1715 | : metric_type(ospf, type, instance); | |
1716 | ||
1717 | mvalue = (ROUTEMAP_METRIC(ei) != -1) | |
1718 | ? ROUTEMAP_METRIC(ei) | |
1719 | : metric_value(ospf, type, instance); | |
1720 | ||
1721 | /* Put type of external metric. */ | |
1722 | stream_putc(s, (mtype == EXTERNAL_METRIC_TYPE_2 ? 0x80 : 0)); | |
1723 | ||
1724 | /* Put 0 metric. TOS metric is not supported. */ | |
1725 | stream_put_ospf_metric(s, mvalue); | |
1726 | ||
1727 | /* Get forwarding address to nexthop if on the Connection List, else 0. | |
1728 | */ | |
1729 | fwd_addr = ospf_external_lsa_nexthop_get(ospf, ei->nexthop); | |
1730 | ||
1731 | /* Put forwarding address. */ | |
1732 | stream_put_ipv4(s, fwd_addr.s_addr); | |
1733 | ||
1734 | /* Put route tag */ | |
1735 | stream_putl(s, ei->tag); | |
1736 | } | |
1737 | ||
1738 | /* Create new external-LSA. */ | |
1739 | static struct ospf_lsa * | |
1740 | ospf_exnl_lsa_prepare_and_flood(struct ospf *ospf, struct external_info *ei, | |
1741 | struct in_addr id) | |
1742 | { | |
1743 | struct stream *s; | |
1744 | struct lsa_header *lsah; | |
1745 | struct ospf_lsa *new; | |
1746 | int length; | |
1747 | ||
1748 | /* Create new stream for LSA. */ | |
1749 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1750 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
1751 | ||
1752 | /* Set LSA common header fields. */ | |
1753 | lsa_header_set(s, OSPF_OPTION_E, OSPF_AS_EXTERNAL_LSA, id, | |
1754 | ospf->router_id); | |
1755 | ||
1756 | /* Set AS-external-LSA body fields. */ | |
1757 | ospf_external_lsa_body_set(s, ei, ospf); | |
1758 | ||
1759 | /* Set length. */ | |
1760 | length = stream_get_endp(s); | |
1761 | lsah->length = htons(length); | |
1762 | ||
1763 | /* Now, create OSPF LSA instance. */ | |
1764 | new = ospf_lsa_new_and_data(length); | |
1765 | new->area = NULL; | |
1766 | SET_FLAG(new->flags, | |
1767 | OSPF_LSA_SELF | OSPF_LSA_APPROVED | OSPF_LSA_SELF_CHECKED); | |
1768 | new->vrf_id = ospf->vrf_id; | |
1769 | ||
1770 | /* Copy LSA data to store, discard stream. */ | |
1771 | memcpy(new->data, lsah, length); | |
1772 | stream_free(s); | |
1773 | ||
1774 | return new; | |
1775 | } | |
1776 | ||
1777 | static struct ospf_lsa *ospf_handle_exnl_lsa_lsId_chg(struct ospf *ospf, | |
1778 | struct external_info *ei, | |
1779 | struct in_addr id) | |
1780 | { | |
1781 | struct ospf_lsa *lsa; | |
1782 | struct as_external_lsa *al; | |
1783 | struct in_addr mask; | |
1784 | struct ospf_lsa *new; | |
1785 | struct external_info ei_summary = {}; | |
1786 | struct external_info *ei_old; | |
1787 | ||
1788 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA, | |
1789 | ei->p.prefix, ospf->router_id); | |
1790 | ||
1791 | if (!lsa) { | |
1792 | flog_warn(EC_OSPF_LSA_NULL, "(%s): LSA not found", __func__); | |
1793 | return NULL; | |
1794 | } | |
1795 | ||
1796 | ei_old = ospf_external_info_check(ospf, lsa); | |
1797 | ||
1798 | al = (struct as_external_lsa *)lsa->data; | |
1799 | ||
1800 | if (!ei_old) { | |
1801 | /* eii_old pointer of LSA is NULL, this | |
1802 | * must be external aggregate route. | |
1803 | */ | |
1804 | ei_summary.p.family = AF_INET; | |
1805 | ei_summary.p.prefix = al->header.id; | |
1806 | ei_summary.p.prefixlen = ip_masklen(al->mask); | |
1807 | ei_summary.tag = (unsigned long)ntohl(al->e[0].route_tag); | |
1808 | ei_old = &ei_summary; | |
1809 | } | |
1810 | ||
1811 | /* change the mask */ | |
1812 | masklen2ip(ei->p.prefixlen, &mask); | |
1813 | al->mask.s_addr = mask.s_addr; | |
1814 | ||
1815 | /*Refresh the LSA with new LSA*/ | |
1816 | ospf_external_lsa_refresh(ospf, lsa, ei, LSA_REFRESH_FORCE, 0); | |
1817 | ||
1818 | /*Originate the old LSA with changed LSID*/ | |
1819 | new = ospf_exnl_lsa_prepare_and_flood(ospf, ei_old, id); | |
1820 | ||
1821 | return new; | |
1822 | } | |
1823 | ||
1824 | static struct ospf_lsa *ospf_external_lsa_new(struct ospf *ospf, | |
1825 | struct external_info *ei, | |
1826 | struct in_addr *old_id) | |
1827 | { | |
1828 | struct ospf_lsa *new; | |
1829 | struct in_addr id; | |
1830 | enum lsid_status status; | |
1831 | ||
1832 | if (ei == NULL) { | |
1833 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1834 | zlog_debug( | |
1835 | "LSA[Type5]: External info is NULL, can't originate"); | |
1836 | return NULL; | |
1837 | } | |
1838 | ||
1839 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1840 | zlog_debug("LSA[Type5]: Originate AS-external-LSA instance"); | |
1841 | ||
1842 | /* If old Link State ID is specified, refresh LSA with same ID. */ | |
1843 | if (old_id) | |
1844 | id = *old_id; | |
1845 | /* Get Link State with unique ID. */ | |
1846 | else { | |
1847 | status = ospf_lsa_unique_id(ospf, ospf->lsdb, | |
1848 | OSPF_AS_EXTERNAL_LSA, &ei->p, &id); | |
1849 | ||
1850 | if (status == LSID_CHANGE) { | |
1851 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1852 | zlog_debug("Link ID has to be changed."); | |
1853 | ||
1854 | new = ospf_handle_exnl_lsa_lsId_chg(ospf, ei, id); | |
1855 | return new; | |
1856 | } else if (status == LSID_NOT_AVAILABLE) { | |
1857 | /* Link State ID not available. */ | |
1858 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1859 | zlog_debug( | |
1860 | "LSA[Type5]: Link ID not available, can't originate"); | |
1861 | return NULL; | |
1862 | } | |
1863 | } | |
1864 | ||
1865 | new = ospf_exnl_lsa_prepare_and_flood(ospf, ei, id); | |
1866 | ||
1867 | return new; | |
1868 | } | |
1869 | ||
1870 | /* As Type-7 */ | |
1871 | static void ospf_install_flood_nssa(struct ospf *ospf, struct ospf_lsa *lsa, | |
1872 | struct external_info *ei) | |
1873 | { | |
1874 | struct ospf_lsa *new; | |
1875 | struct as_external_lsa *extlsa; | |
1876 | struct ospf_area *area; | |
1877 | struct listnode *node, *nnode; | |
1878 | ||
1879 | /* LSA may be a Type-5 originated via translation of a Type-7 LSA | |
1880 | * which originated from an NSSA area. In which case it should not be | |
1881 | * flooded back to NSSA areas. | |
1882 | */ | |
1883 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
1884 | return; | |
1885 | ||
1886 | /* NSSA Originate or Refresh (If anyNSSA) | |
1887 | ||
1888 | LSA is self-originated. And just installed as Type-5. | |
1889 | Additionally, install as Type-7 LSDB for every attached NSSA. | |
1890 | ||
1891 | P-Bit controls which ABR performs translation to outside world; If | |
1892 | we are an ABR....do not set the P-bit, because we send the Type-5, | |
1893 | not as the ABR Translator, but as the ASBR owner within the AS! | |
1894 | ||
1895 | If we are NOT ABR, Flood through NSSA as Type-7 w/P-bit set. The | |
1896 | elected ABR Translator will see the P-bit, Translate, and re-flood. | |
1897 | ||
1898 | Later, ABR_TASK and P-bit will scan Type-7 LSDB and translate to | |
1899 | Type-5's to non-NSSA Areas. (it will also attempt a re-install) */ | |
1900 | ||
1901 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
1902 | /* Don't install Type-7 LSA's into nonNSSA area */ | |
1903 | if (area->external_routing != OSPF_AREA_NSSA) | |
1904 | continue; | |
1905 | ||
1906 | /* make lsa duplicate, lock=1 */ | |
1907 | new = ospf_lsa_dup(lsa); | |
1908 | new->area = area; | |
1909 | new->data->type = OSPF_AS_NSSA_LSA; | |
1910 | ||
1911 | /* set P-bit if not ABR */ | |
1912 | if (!IS_OSPF_ABR(ospf)) { | |
1913 | SET_FLAG(new->data->options, OSPF_OPTION_NP); | |
1914 | ||
1915 | /* set non-zero FWD ADDR | |
1916 | ||
1917 | draft-ietf-ospf-nssa-update-09.txt | |
1918 | ||
1919 | if the network between the NSSA AS boundary router and | |
1920 | the | |
1921 | adjacent AS is advertised into OSPF as an internal OSPF | |
1922 | route, | |
1923 | the forwarding address should be the next op address as | |
1924 | is cu | |
1925 | currently done with type-5 LSAs. If the intervening | |
1926 | network is | |
1927 | not adversited into OSPF as an internal OSPF route and | |
1928 | the | |
1929 | type-7 LSA's P-bit is set a forwarding address should be | |
1930 | selected from one of the router's active OSPF interface | |
1931 | addresses | |
1932 | which belong to the NSSA. If no such addresses exist, | |
1933 | then | |
1934 | no type-7 LSA's with the P-bit set should originate from | |
1935 | this | |
1936 | router. */ | |
1937 | ||
1938 | /* kevinm: not updating lsa anymore, just new */ | |
1939 | extlsa = (struct as_external_lsa *)(new->data); | |
1940 | ||
1941 | if (extlsa->e[0].fwd_addr.s_addr == INADDR_ANY) | |
1942 | extlsa->e[0].fwd_addr = ospf_get_nssa_ip( | |
1943 | area); /* this NSSA area in ifp */ | |
1944 | ||
1945 | if (extlsa->e[0].fwd_addr.s_addr == INADDR_ANY) { | |
1946 | if (IS_DEBUG_OSPF_NSSA) | |
1947 | zlog_debug( | |
1948 | "LSA[Type-7]: Could not build FWD-ADDR"); | |
1949 | ospf_lsa_discard(new); | |
1950 | return; | |
1951 | } | |
1952 | } | |
1953 | ||
1954 | /* install also as Type-7 */ | |
1955 | ospf_lsa_install(ospf, NULL, | |
1956 | new); /* Remove Old, Lock New = 2 */ | |
1957 | ||
1958 | /* will send each copy, lock=2+n */ | |
1959 | ospf_flood_through_as( | |
1960 | ospf, NULL, new); /* all attached NSSA's, no AS/STUBs */ | |
1961 | } | |
1962 | } | |
1963 | ||
1964 | static struct ospf_lsa *ospf_lsa_translated_nssa_new(struct ospf *ospf, | |
1965 | struct ospf_lsa *type7) | |
1966 | { | |
1967 | ||
1968 | struct ospf_lsa *new; | |
1969 | struct as_external_lsa *ext, *extnew; | |
1970 | struct external_info ei; | |
1971 | ||
1972 | ext = (struct as_external_lsa *)(type7->data); | |
1973 | ||
1974 | /* need external_info struct, fill in bare minimum */ | |
1975 | ei.p.family = AF_INET; | |
1976 | ei.p.prefix = type7->data->id; | |
1977 | ei.p.prefixlen = ip_masklen(ext->mask); | |
1978 | ei.type = ZEBRA_ROUTE_OSPF; | |
1979 | ei.nexthop = ext->header.adv_router; | |
1980 | ei.route_map_set.metric = -1; | |
1981 | ei.route_map_set.metric_type = -1; | |
1982 | ei.tag = 0; | |
1983 | ei.instance = 0; | |
1984 | ||
1985 | if ((new = ospf_external_lsa_new(ospf, &ei, &type7->data->id)) | |
1986 | == NULL) { | |
1987 | if (IS_DEBUG_OSPF_NSSA) | |
1988 | zlog_debug( | |
1989 | "%s: Could not originate Translated Type-5 for %pI4", | |
1990 | __func__, &ei.p.prefix); | |
1991 | return NULL; | |
1992 | } | |
1993 | ||
1994 | extnew = (struct as_external_lsa *)(new->data); | |
1995 | ||
1996 | /* copy over Type-7 data to new */ | |
1997 | extnew->e[0].tos = ext->e[0].tos; | |
1998 | extnew->e[0].route_tag = ext->e[0].route_tag; | |
1999 | if (type7->area->suppress_fa) { | |
2000 | extnew->e[0].fwd_addr.s_addr = 0; | |
2001 | if (IS_DEBUG_OSPF_NSSA) | |
2002 | zlog_debug("%s: Suppress forwarding address for %pI4", | |
2003 | __func__, &ei.p.prefix); | |
2004 | } else | |
2005 | extnew->e[0].fwd_addr.s_addr = ext->e[0].fwd_addr.s_addr; | |
2006 | new->data->ls_seqnum = type7->data->ls_seqnum; | |
2007 | ||
2008 | /* add translated flag, checksum and lock new lsa */ | |
2009 | SET_FLAG(new->flags, OSPF_LSA_LOCAL_XLT); /* Translated from 7 */ | |
2010 | new = ospf_lsa_lock(new); | |
2011 | ||
2012 | return new; | |
2013 | } | |
2014 | ||
2015 | /* Originate Translated Type-5 for supplied Type-7 NSSA LSA */ | |
2016 | struct ospf_lsa *ospf_translated_nssa_originate(struct ospf *ospf, | |
2017 | struct ospf_lsa *type7, | |
2018 | struct ospf_lsa *type5) | |
2019 | { | |
2020 | struct ospf_lsa *new; | |
2021 | struct as_external_lsa *extnew; | |
2022 | ||
2023 | if (ospf->gr_info.restart_in_progress) { | |
2024 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2025 | zlog_debug( | |
2026 | "LSA[Translated Type5]: Graceful Restart in progress, don't originate"); | |
2027 | return NULL; | |
2028 | } | |
2029 | ||
2030 | /* we cant use ospf_external_lsa_originate() as we need to set | |
2031 | * the OSPF_LSA_LOCAL_XLT flag, must originate by hand | |
2032 | */ | |
2033 | ||
2034 | if ((new = ospf_lsa_translated_nssa_new(ospf, type7)) == NULL) { | |
2035 | if (IS_DEBUG_OSPF_NSSA) | |
2036 | zlog_debug( | |
2037 | "%s: Could not translate Type-7, Id %pI4, to Type-5", | |
2038 | __func__, &type7->data->id); | |
2039 | return NULL; | |
2040 | } | |
2041 | ||
2042 | extnew = (struct as_external_lsa *)new->data; | |
2043 | ||
2044 | /* Update LSA sequence number from translated Type-5 LSA */ | |
2045 | if (type5) | |
2046 | new->data->ls_seqnum = lsa_seqnum_increment(type5); | |
2047 | ||
2048 | if ((new = ospf_lsa_install(ospf, NULL, new)) == NULL) { | |
2049 | flog_warn(EC_OSPF_LSA_INSTALL_FAILURE, | |
2050 | "%s: Could not install LSA id %pI4", __func__, | |
2051 | &type7->data->id); | |
2052 | return NULL; | |
2053 | } | |
2054 | ||
2055 | if (IS_DEBUG_OSPF_NSSA) { | |
2056 | zlog_debug("%s: translated Type 7, installed", __func__); | |
2057 | ospf_lsa_header_dump(new->data); | |
2058 | zlog_debug(" Network mask: %d", ip_masklen(extnew->mask)); | |
2059 | zlog_debug(" Forward addr: %pI4", | |
2060 | &extnew->e[0].fwd_addr); | |
2061 | } | |
2062 | ||
2063 | ospf->lsa_originate_count++; | |
2064 | ospf_flood_through_as(ospf, NULL, new); | |
2065 | ||
2066 | return new; | |
2067 | } | |
2068 | ||
2069 | /* Refresh Translated from NSSA AS-external-LSA. */ | |
2070 | struct ospf_lsa *ospf_translated_nssa_refresh(struct ospf *ospf, | |
2071 | struct ospf_lsa *type7, | |
2072 | struct ospf_lsa *type5) | |
2073 | { | |
2074 | struct ospf_lsa *new = NULL; | |
2075 | struct as_external_lsa *extold = NULL; | |
2076 | uint32_t ls_seqnum = 0; | |
2077 | ||
2078 | /* Sanity checks. */ | |
2079 | assert(type7 || type5); | |
2080 | if (!(type7 || type5)) | |
2081 | return NULL; | |
2082 | if (type7) | |
2083 | assert(type7->data); | |
2084 | if (type5) | |
2085 | assert(type5->data); | |
2086 | assert(ospf->anyNSSA); | |
2087 | ||
2088 | /* get required data according to what has been given */ | |
2089 | if (type7 && type5 == NULL) { | |
2090 | /* find the translated Type-5 for this Type-7 */ | |
2091 | struct as_external_lsa *ext = | |
2092 | (struct as_external_lsa *)(type7->data); | |
2093 | struct prefix_ipv4 p = { | |
2094 | .prefix = type7->data->id, | |
2095 | .prefixlen = ip_masklen(ext->mask), | |
2096 | .family = AF_INET, | |
2097 | }; | |
2098 | ||
2099 | type5 = ospf_external_info_find_lsa(ospf, &p); | |
2100 | } else if (type5 && type7 == NULL) { | |
2101 | /* find the type-7 from which supplied type-5 was translated, | |
2102 | * ie find first type-7 with same LSA Id. | |
2103 | */ | |
2104 | struct listnode *ln, *lnn; | |
2105 | struct route_node *rn; | |
2106 | struct ospf_lsa *lsa; | |
2107 | struct ospf_area *area; | |
2108 | ||
2109 | for (ALL_LIST_ELEMENTS(ospf->areas, ln, lnn, area)) { | |
2110 | if (area->external_routing != OSPF_AREA_NSSA && !type7) | |
2111 | continue; | |
2112 | ||
2113 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) { | |
2114 | if (lsa->data->id.s_addr | |
2115 | == type5->data->id.s_addr) { | |
2116 | type7 = lsa; | |
2117 | break; | |
2118 | } | |
2119 | } | |
2120 | } | |
2121 | } | |
2122 | ||
2123 | /* do we have type7? */ | |
2124 | if (!type7) { | |
2125 | if (IS_DEBUG_OSPF_NSSA) | |
2126 | zlog_debug("%s: no Type-7 found for Type-5 LSA Id %pI4", | |
2127 | __func__, &type5->data->id); | |
2128 | return NULL; | |
2129 | } | |
2130 | ||
2131 | /* do we have valid translated type5? */ | |
2132 | if (type5 == NULL || !CHECK_FLAG(type5->flags, OSPF_LSA_LOCAL_XLT)) { | |
2133 | if (IS_DEBUG_OSPF_NSSA) | |
2134 | zlog_debug( | |
2135 | "%s: No translated Type-5 found for Type-7 with Id %pI4", | |
2136 | __func__, &type7->data->id); | |
2137 | return NULL; | |
2138 | } | |
2139 | ||
2140 | extold = (struct as_external_lsa *)type5->data; | |
2141 | if (type7->area->suppress_fa == 1) { | |
2142 | if (extold->e[0].fwd_addr.s_addr == 0) | |
2143 | ls_seqnum = ntohl(type5->data->ls_seqnum); | |
2144 | } | |
2145 | ||
2146 | /* Delete LSA from neighbor retransmit-list. */ | |
2147 | ospf_ls_retransmit_delete_nbr_as(ospf, type5); | |
2148 | ||
2149 | /* create new translated LSA */ | |
2150 | if ((new = ospf_lsa_translated_nssa_new(ospf, type7)) == NULL) { | |
2151 | if (IS_DEBUG_OSPF_NSSA) | |
2152 | zlog_debug( | |
2153 | "%s: Could not translate Type-7 for %pI4 to Type-5", | |
2154 | __func__, &type7->data->id); | |
2155 | return NULL; | |
2156 | } | |
2157 | ||
2158 | if (type7->area->suppress_fa == 1) { | |
2159 | if (extold->e[0].fwd_addr.s_addr == 0) | |
2160 | new->data->ls_seqnum = htonl(ls_seqnum + 1); | |
2161 | } | |
2162 | ||
2163 | if (!(new = ospf_lsa_install(ospf, NULL, new))) { | |
2164 | flog_warn(EC_OSPF_LSA_INSTALL_FAILURE, | |
2165 | "%s: Could not install translated LSA, Id %pI4", | |
2166 | __func__, &type7->data->id); | |
2167 | return NULL; | |
2168 | } | |
2169 | ||
2170 | /* Flood LSA through area. */ | |
2171 | ospf_flood_through_as(ospf, NULL, new); | |
2172 | ||
2173 | return new; | |
2174 | } | |
2175 | ||
2176 | /* Originate an AS-external-LSA, install and flood. */ | |
2177 | struct ospf_lsa *ospf_external_lsa_originate(struct ospf *ospf, | |
2178 | struct external_info *ei) | |
2179 | { | |
2180 | struct ospf_lsa *new; | |
2181 | ||
2182 | if (ospf->gr_info.restart_in_progress) { | |
2183 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2184 | zlog_debug( | |
2185 | "LSA[Type5]: Graceful Restart in progress, don't originate"); | |
2186 | return NULL; | |
2187 | } | |
2188 | ||
2189 | /* Added for NSSA project.... | |
2190 | ||
2191 | External LSAs are originated in ASBRs as usual, but for NSSA | |
2192 | systems. | |
2193 | there is the global Type-5 LSDB and a Type-7 LSDB installed for | |
2194 | every area. The Type-7's are flooded to every IR and every ABR; We | |
2195 | install the Type-5 LSDB so that the normal "refresh" code operates | |
2196 | as usual, and flag them as not used during ASE calculations. The | |
2197 | Type-7 LSDB is used for calculations. Each Type-7 has a Forwarding | |
2198 | Address of non-zero. | |
2199 | ||
2200 | If an ABR is the elected NSSA translator, following SPF and during | |
2201 | the ABR task it will translate all the scanned Type-7's, with P-bit | |
2202 | ON and not-self generated, and translate to Type-5's throughout the | |
2203 | non-NSSA/STUB AS. | |
2204 | ||
2205 | A difference in operation depends whether this ASBR is an ABR | |
2206 | or not. If not an ABR, the P-bit is ON, to indicate that any | |
2207 | elected NSSA-ABR can perform its translation. | |
2208 | ||
2209 | If an ABR, the P-bit is OFF; No ABR will perform translation and | |
2210 | this ASBR will flood the Type-5 LSA as usual. | |
2211 | ||
2212 | For the case where this ASBR is not an ABR, the ASE calculations | |
2213 | are based on the Type-5 LSDB; The Type-7 LSDB exists just to | |
2214 | demonstrate to the user that there are LSA's that belong to any | |
2215 | attached NSSA. | |
2216 | ||
2217 | Finally, it just so happens that when the ABR is translating every | |
2218 | Type-7 into Type-5, it installs it into the Type-5 LSDB as an | |
2219 | approved Type-5 (translated from Type-7); at the end of translation | |
2220 | if any Translated Type-5's remain unapproved, then they must be | |
2221 | flushed from the AS. | |
2222 | ||
2223 | */ | |
2224 | ||
2225 | if (ospf->router_id.s_addr == INADDR_ANY) { | |
2226 | if (ei && IS_DEBUG_OSPF_EVENT) | |
2227 | zlog_debug( | |
2228 | "LSA[Type5:%pI4]: deferring AS-external-LSA origination, router ID is zero", | |
2229 | &ei->p.prefix); | |
2230 | return NULL; | |
2231 | } | |
2232 | ||
2233 | /* Create new AS-external-LSA instance. */ | |
2234 | if ((new = ospf_external_lsa_new(ospf, ei, NULL)) == NULL) { | |
2235 | if (ei && IS_DEBUG_OSPF_EVENT) | |
2236 | zlog_debug( | |
2237 | "LSA[Type5:%pI4]: Could not originate AS-external-LSA", | |
2238 | &ei->p.prefix); | |
2239 | return NULL; | |
2240 | } | |
2241 | ||
2242 | /* Install newly created LSA into Type-5 LSDB, lock = 1. */ | |
2243 | ospf_lsa_install(ospf, NULL, new); | |
2244 | ||
2245 | /* Update LSA origination count. */ | |
2246 | ospf->lsa_originate_count++; | |
2247 | ||
2248 | /* Flooding new LSA. only to AS (non-NSSA/STUB) */ | |
2249 | ospf_flood_through_as(ospf, NULL, new); | |
2250 | ||
2251 | /* If there is any attached NSSA, do special handling */ | |
2252 | if (ospf->anyNSSA && | |
2253 | /* stay away from translated LSAs! */ | |
2254 | !(CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT))) | |
2255 | ospf_install_flood_nssa( | |
2256 | ospf, new, ei); /* Install/Flood Type-7 to all NSSAs */ | |
2257 | ||
2258 | /* Debug logging. */ | |
2259 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
2260 | zlog_debug("LSA[Type%d:%pI4]: Originate AS-external-LSA %p", | |
2261 | new->data->type, &new->data->id, | |
2262 | (void *)new); | |
2263 | ospf_lsa_header_dump(new->data); | |
2264 | } | |
2265 | ||
2266 | return new; | |
2267 | } | |
2268 | ||
2269 | static struct external_info *ospf_default_external_info(struct ospf *ospf) | |
2270 | { | |
2271 | int type; | |
2272 | struct prefix_ipv4 p; | |
2273 | struct external_info *default_ei; | |
2274 | int ret = 0; | |
2275 | ||
2276 | p.family = AF_INET; | |
2277 | p.prefix.s_addr = 0; | |
2278 | p.prefixlen = 0; | |
2279 | ||
2280 | default_ei = ospf_external_info_lookup(ospf, DEFAULT_ROUTE, 0, &p); | |
2281 | if (!default_ei) | |
2282 | return NULL; | |
2283 | ||
2284 | /* First, lookup redistributed default route. */ | |
2285 | for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) { | |
2286 | struct list *ext_list; | |
2287 | ||
2288 | if (type == ZEBRA_ROUTE_OSPF) | |
2289 | continue; | |
2290 | ||
2291 | ext_list = ospf->external[type]; | |
2292 | if (!ext_list) | |
2293 | continue; | |
2294 | ||
2295 | ret = ospf_external_default_routemap_apply_walk(ospf, ext_list, | |
2296 | default_ei); | |
2297 | if (ret) | |
2298 | return default_ei; | |
2299 | } | |
2300 | ||
2301 | return NULL; | |
2302 | } | |
2303 | ||
2304 | void ospf_external_lsa_rid_change(struct ospf *ospf) | |
2305 | { | |
2306 | struct external_info *ei; | |
2307 | struct ospf_external_aggr_rt *aggr; | |
2308 | struct ospf_lsa *lsa = NULL; | |
2309 | int force; | |
2310 | int type; | |
2311 | ||
2312 | for (type = 0; type < ZEBRA_ROUTE_MAX; type++) { | |
2313 | struct route_node *rn; | |
2314 | struct route_table *rt; | |
2315 | struct list *ext_list; | |
2316 | struct listnode *node; | |
2317 | struct ospf_external *ext; | |
2318 | ||
2319 | ext_list = ospf->external[type]; | |
2320 | if (!ext_list) | |
2321 | continue; | |
2322 | ||
2323 | for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) { | |
2324 | /* Originate As-external-LSA from all type of | |
2325 | * distribute source. | |
2326 | */ | |
2327 | rt = ext->external_info; | |
2328 | if (!rt) | |
2329 | continue; | |
2330 | ||
2331 | for (rn = route_top(rt); rn; rn = route_next(rn)) { | |
2332 | ei = rn->info; | |
2333 | ||
2334 | if (!ei) | |
2335 | continue; | |
2336 | ||
2337 | if (is_default_prefix4(&ei->p)) | |
2338 | continue; | |
2339 | ||
2340 | lsa = ospf_external_info_find_lsa(ospf, &ei->p); | |
2341 | ||
2342 | aggr = ospf_external_aggr_match(ospf, &ei->p); | |
2343 | if (aggr) { | |
2344 | ||
2345 | if (!ospf_redistribute_check(ospf, ei, | |
2346 | NULL)) | |
2347 | continue; | |
2348 | ||
2349 | if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR)) | |
2350 | zlog_debug( | |
2351 | "Originate Summary LSA after reset/router-ID change"); | |
2352 | ||
2353 | /* Here the LSA is originated as new */ | |
2354 | ospf_originate_summary_lsa(ospf, aggr, | |
2355 | ei); | |
2356 | } else if (lsa) { | |
2357 | /* LSA needs to be refreshed even if | |
2358 | * there is no change in the route | |
2359 | * params if the LSA is in maxage. | |
2360 | */ | |
2361 | if (IS_LSA_MAXAGE(lsa)) | |
2362 | force = LSA_REFRESH_FORCE; | |
2363 | else | |
2364 | force = LSA_REFRESH_IF_CHANGED; | |
2365 | ||
2366 | ospf_external_lsa_refresh(ospf, lsa, | |
2367 | ei, force, 0); | |
2368 | } else { | |
2369 | if (!ospf_redistribute_check(ospf, ei, | |
2370 | NULL)) | |
2371 | continue; | |
2372 | ||
2373 | if (!ospf_external_lsa_originate(ospf, | |
2374 | ei)) | |
2375 | flog_warn( | |
2376 | EC_OSPF_LSA_INSTALL_FAILURE, | |
2377 | "LSA: AS-external-LSA was not originated."); | |
2378 | } | |
2379 | } | |
2380 | } | |
2381 | } | |
2382 | ||
2383 | ei = ospf_default_external_info(ospf); | |
2384 | if (ei && !ospf_external_lsa_originate(ospf, ei)) { | |
2385 | flog_warn(EC_OSPF_LSA_INSTALL_FAILURE, | |
2386 | "LSA: AS-external-LSA for default route was not originated."); | |
2387 | } | |
2388 | } | |
2389 | ||
2390 | /* Flush any NSSA LSAs for given prefix */ | |
2391 | void ospf_nssa_lsa_flush(struct ospf *ospf, struct prefix_ipv4 *p) | |
2392 | { | |
2393 | struct listnode *node, *nnode; | |
2394 | struct ospf_lsa *lsa = NULL; | |
2395 | struct ospf_area *area; | |
2396 | ||
2397 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
2398 | if (area->external_routing == OSPF_AREA_NSSA) { | |
2399 | lsa = ospf_lsa_lookup(ospf, area, OSPF_AS_NSSA_LSA, | |
2400 | p->prefix, ospf->router_id); | |
2401 | if (!lsa) { | |
2402 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2403 | zlog_debug( | |
2404 | "LSA: There is no such AS-NSSA-LSA %pFX in LSDB", | |
2405 | p); | |
2406 | continue; | |
2407 | } | |
2408 | ospf_ls_retransmit_delete_nbr_area(area, lsa); | |
2409 | if (!IS_LSA_MAXAGE(lsa)) { | |
2410 | ospf_refresher_unregister_lsa(ospf, lsa); | |
2411 | ospf_lsa_flush_area(lsa, area); | |
2412 | } | |
2413 | } | |
2414 | } | |
2415 | } | |
2416 | ||
2417 | /* Flush an AS-external-LSA from LSDB and routing domain. */ | |
2418 | void ospf_external_lsa_flush(struct ospf *ospf, uint8_t type, | |
2419 | struct prefix_ipv4 *p, | |
2420 | ifindex_t ifindex /*, struct in_addr nexthop */) | |
2421 | { | |
2422 | struct ospf_lsa *lsa; | |
2423 | ||
2424 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2425 | zlog_debug("LSA: Flushing AS-external-LSA %pFX", p); | |
2426 | ||
2427 | /* First lookup LSA from LSDB. */ | |
2428 | if (!(lsa = ospf_external_info_find_lsa(ospf, p))) { | |
2429 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2430 | zlog_debug( | |
2431 | "LSA: There is no such AS-external-LSA %pFX in LSDB", | |
2432 | p); | |
2433 | return; | |
2434 | } | |
2435 | ||
2436 | /* If LSA is selforiginated, not a translated LSA, and there is | |
2437 | * NSSA area, flush Type-7 LSA's at first. | |
2438 | */ | |
2439 | if (IS_LSA_SELF(lsa) && (ospf->anyNSSA) | |
2440 | && !(CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT))) | |
2441 | ospf_nssa_lsa_flush(ospf, p); | |
2442 | ||
2443 | if (!IS_LSA_MAXAGE(lsa)) { | |
2444 | /* Sweep LSA from Link State Retransmit List. */ | |
2445 | ospf_ls_retransmit_delete_nbr_as(ospf, lsa); | |
2446 | ||
2447 | /* Unregister LSA from Refresh queue. */ | |
2448 | ospf_refresher_unregister_lsa(ospf, lsa); | |
2449 | ||
2450 | /* Flush AS-external-LSA through AS. */ | |
2451 | ospf_lsa_flush_as(ospf, lsa); | |
2452 | } | |
2453 | ||
2454 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2455 | zlog_debug("%s: stop", __func__); | |
2456 | } | |
2457 | ||
2458 | void ospf_external_lsa_refresh_default(struct ospf *ospf) | |
2459 | { | |
2460 | struct prefix_ipv4 p; | |
2461 | struct external_info *ei; | |
2462 | struct ospf_lsa *lsa; | |
2463 | ||
2464 | p.family = AF_INET; | |
2465 | p.prefixlen = 0; | |
2466 | p.prefix.s_addr = INADDR_ANY; | |
2467 | ||
2468 | ei = ospf_default_external_info(ospf); | |
2469 | lsa = ospf_external_info_find_lsa(ospf, &p); | |
2470 | ||
2471 | if (ei && lsa) { | |
2472 | if (IS_DEBUG_OSPF_EVENT) | |
2473 | zlog_debug("LSA[Type5:0.0.0.0]: Refresh AS-external-LSA %p", | |
2474 | (void *)lsa); | |
2475 | ospf_external_lsa_refresh(ospf, lsa, ei, LSA_REFRESH_FORCE, | |
2476 | false); | |
2477 | } else if (ei && !lsa) { | |
2478 | if (IS_DEBUG_OSPF_EVENT) | |
2479 | zlog_debug( | |
2480 | "LSA[Type5:0.0.0.0]: Originate AS-external-LSA"); | |
2481 | ospf_external_lsa_originate(ospf, ei); | |
2482 | } else if (lsa) { | |
2483 | if (IS_DEBUG_OSPF_EVENT) | |
2484 | zlog_debug("LSA[Type5:0.0.0.0]: Flush AS-external-LSA"); | |
2485 | ospf_external_lsa_flush(ospf, DEFAULT_ROUTE, &p, 0); | |
2486 | } | |
2487 | } | |
2488 | ||
2489 | void ospf_external_lsa_refresh_type(struct ospf *ospf, uint8_t type, | |
2490 | unsigned short instance, int force) | |
2491 | { | |
2492 | struct route_node *rn; | |
2493 | struct external_info *ei; | |
2494 | struct ospf_external *ext; | |
2495 | ||
2496 | if (type == DEFAULT_ROUTE) | |
2497 | return; | |
2498 | ||
2499 | ext = ospf_external_lookup(ospf, type, instance); | |
2500 | ||
2501 | if (ext && EXTERNAL_INFO(ext)) { | |
2502 | /* Refresh each redistributed AS-external-LSAs. */ | |
2503 | for (rn = route_top(EXTERNAL_INFO(ext)); rn; | |
2504 | rn = route_next(rn)) { | |
2505 | ei = rn->info; | |
2506 | if (ei) { | |
2507 | if (!is_default_prefix4(&ei->p)) { | |
2508 | struct ospf_lsa *lsa; | |
2509 | struct ospf_external_aggr_rt *aggr; | |
2510 | ||
2511 | aggr = ospf_external_aggr_match(ospf, | |
2512 | &ei->p); | |
2513 | lsa = ospf_external_info_find_lsa( | |
2514 | ospf, &ei->p); | |
2515 | if (aggr) { | |
2516 | /* Check the AS-external-LSA | |
2517 | * should be originated. | |
2518 | */ | |
2519 | if (!ospf_redistribute_check( | |
2520 | ospf, ei, NULL)) { | |
2521 | ||
2522 | ospf_unlink_ei_from_aggr( | |
2523 | ospf, aggr, ei); | |
2524 | continue; | |
2525 | } | |
2526 | ||
2527 | if (IS_DEBUG_OSPF( | |
2528 | lsa, | |
2529 | EXTNL_LSA_AGGR)) | |
2530 | zlog_debug( | |
2531 | "%s: Send Aggreate LSA (%pFX)", | |
2532 | __func__, | |
2533 | &aggr->p); | |
2534 | ||
2535 | ospf_originate_summary_lsa( | |
2536 | ospf, aggr, ei); | |
2537 | ||
2538 | } else if (lsa) { | |
2539 | ||
2540 | if (IS_LSA_MAXAGE(lsa)) | |
2541 | force = LSA_REFRESH_FORCE; | |
2542 | ||
2543 | ospf_external_lsa_refresh( | |
2544 | ospf, lsa, ei, force, | |
2545 | false); | |
2546 | } else { | |
2547 | if (!ospf_redistribute_check( | |
2548 | ospf, ei, NULL)) | |
2549 | continue; | |
2550 | ospf_external_lsa_originate( | |
2551 | ospf, ei); | |
2552 | } | |
2553 | } | |
2554 | } | |
2555 | } | |
2556 | } | |
2557 | } | |
2558 | ||
2559 | /* Refresh AS-external-LSA. */ | |
2560 | struct ospf_lsa *ospf_external_lsa_refresh(struct ospf *ospf, | |
2561 | struct ospf_lsa *lsa, | |
2562 | struct external_info *ei, int force, | |
2563 | bool is_aggr) | |
2564 | { | |
2565 | struct ospf_lsa *new; | |
2566 | int changed = 0; | |
2567 | ||
2568 | /* Check the AS-external-LSA should be originated. */ | |
2569 | if (!is_aggr) | |
2570 | if (!ospf_redistribute_check(ospf, ei, &changed)) { | |
2571 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2572 | zlog_debug( | |
2573 | "LSA[Type%d:%pI4] Could not be refreshed, redist check fail", | |
2574 | lsa->data->type, | |
2575 | &lsa->data->id); | |
2576 | ||
2577 | ospf_external_lsa_flush(ospf, ei->type, &ei->p, | |
2578 | ei->ifindex /*, ei->nexthop */); | |
2579 | return NULL; | |
2580 | } | |
2581 | ||
2582 | if (!changed && !force) { | |
2583 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2584 | zlog_debug( | |
2585 | "LSA[Type%d:%pI4]: Not refreshed, not changed/forced", | |
2586 | lsa->data->type, &lsa->data->id); | |
2587 | return NULL; | |
2588 | } | |
2589 | ||
2590 | /* Delete LSA from neighbor retransmit-list. */ | |
2591 | ospf_ls_retransmit_delete_nbr_as(ospf, lsa); | |
2592 | ||
2593 | /* Unregister AS-external-LSA from refresh-list. */ | |
2594 | ospf_refresher_unregister_lsa(ospf, lsa); | |
2595 | ||
2596 | new = ospf_external_lsa_new(ospf, ei, &lsa->data->id); | |
2597 | ||
2598 | if (new == NULL) { | |
2599 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2600 | zlog_debug("LSA[Type%d:%pI4]: Could not be refreshed", | |
2601 | lsa->data->type, &lsa->data->id); | |
2602 | return NULL; | |
2603 | } | |
2604 | ||
2605 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
2606 | ||
2607 | ospf_lsa_install(ospf, NULL, new); /* As type-5. */ | |
2608 | ||
2609 | /* Flood LSA through AS. */ | |
2610 | ospf_flood_through_as(ospf, NULL, new); | |
2611 | ||
2612 | /* If any attached NSSA, install as Type-7, flood to all NSSA Areas */ | |
2613 | if (ospf->anyNSSA && !(CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT))) | |
2614 | ospf_install_flood_nssa(ospf, new, | |
2615 | ei); /* Install/Flood per new rules */ | |
2616 | ||
2617 | /* Register self-originated LSA to refresh queue. | |
2618 | * Translated LSAs should not be registered, but refreshed upon | |
2619 | * refresh of the Type-7 | |
2620 | */ | |
2621 | if (!CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT)) | |
2622 | ospf_refresher_register_lsa(ospf, new); | |
2623 | ||
2624 | /* Debug logging. */ | |
2625 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
2626 | zlog_debug("LSA[Type%d:%pI4]: AS-external-LSA refresh", | |
2627 | new->data->type, &new->data->id); | |
2628 | ospf_lsa_header_dump(new->data); | |
2629 | } | |
2630 | ||
2631 | return new; | |
2632 | } | |
2633 | ||
2634 | ||
2635 | /* LSA installation functions. */ | |
2636 | ||
2637 | /* Install router-LSA to an area. */ | |
2638 | static struct ospf_lsa * | |
2639 | ospf_router_lsa_install(struct ospf *ospf, struct ospf_lsa *new, int rt_recalc) | |
2640 | { | |
2641 | struct ospf_area *area = new->area; | |
2642 | ||
2643 | /* RFC 2328 Section 13.2 Router-LSAs and network-LSAs | |
2644 | The entire routing table must be recalculated, starting with | |
2645 | the shortest path calculations for each area (not just the | |
2646 | area whose link-state database has changed). | |
2647 | */ | |
2648 | ||
2649 | if (IS_LSA_SELF(new)) { | |
2650 | ||
2651 | /* Only install LSA if it is originated/refreshed by us. | |
2652 | * If LSA was received by flooding, the RECEIVED flag is set so | |
2653 | * do | |
2654 | * not link the LSA */ | |
2655 | if (CHECK_FLAG(new->flags, OSPF_LSA_RECEIVED)) | |
2656 | return new; /* ignore stale LSA */ | |
2657 | ||
2658 | /* Set self-originated router-LSA. */ | |
2659 | ospf_lsa_unlock(&area->router_lsa_self); | |
2660 | area->router_lsa_self = ospf_lsa_lock(new); | |
2661 | ||
2662 | ospf_refresher_register_lsa(ospf, new); | |
2663 | } | |
2664 | if (rt_recalc) | |
2665 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_ROUTER_LSA_INSTALL); | |
2666 | return new; | |
2667 | } | |
2668 | ||
2669 | /* Install network-LSA to an area. */ | |
2670 | static struct ospf_lsa *ospf_network_lsa_install(struct ospf *ospf, | |
2671 | struct ospf_interface *oi, | |
2672 | struct ospf_lsa *new, | |
2673 | int rt_recalc) | |
2674 | { | |
2675 | ||
2676 | /* RFC 2328 Section 13.2 Router-LSAs and network-LSAs | |
2677 | The entire routing table must be recalculated, starting with | |
2678 | the shortest path calculations for each area (not just the | |
2679 | area whose link-state database has changed). | |
2680 | */ | |
2681 | if (IS_LSA_SELF(new)) { | |
2682 | /* We supposed that when LSA is originated by us, we pass the | |
2683 | int | |
2684 | for which it was originated. If LSA was received by flooding, | |
2685 | the RECEIVED flag is set, so we do not link the LSA to the | |
2686 | int. */ | |
2687 | if (CHECK_FLAG(new->flags, OSPF_LSA_RECEIVED)) | |
2688 | return new; /* ignore stale LSA */ | |
2689 | ||
2690 | ospf_lsa_unlock(&oi->network_lsa_self); | |
2691 | oi->network_lsa_self = ospf_lsa_lock(new); | |
2692 | ospf_refresher_register_lsa(ospf, new); | |
2693 | } | |
2694 | if (rt_recalc) | |
2695 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_NETWORK_LSA_INSTALL); | |
2696 | ||
2697 | return new; | |
2698 | } | |
2699 | ||
2700 | /* Install summary-LSA to an area. */ | |
2701 | static struct ospf_lsa * | |
2702 | ospf_summary_lsa_install(struct ospf *ospf, struct ospf_lsa *new, int rt_recalc) | |
2703 | { | |
2704 | if (rt_recalc && !IS_LSA_SELF(new)) { | |
2705 | /* RFC 2328 Section 13.2 Summary-LSAs | |
2706 | The best route to the destination described by the summary- | |
2707 | LSA must be recalculated (see Section 16.5). If this | |
2708 | destination is an AS boundary router, it may also be | |
2709 | necessary to re-examine all the AS-external-LSAs. | |
2710 | */ | |
2711 | ||
2712 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_SUMMARY_LSA_INSTALL); | |
2713 | } | |
2714 | ||
2715 | if (IS_LSA_SELF(new)) | |
2716 | ospf_refresher_register_lsa(ospf, new); | |
2717 | ||
2718 | return new; | |
2719 | } | |
2720 | ||
2721 | /* Install ASBR-summary-LSA to an area. */ | |
2722 | static struct ospf_lsa *ospf_summary_asbr_lsa_install(struct ospf *ospf, | |
2723 | struct ospf_lsa *new, | |
2724 | int rt_recalc) | |
2725 | { | |
2726 | if (rt_recalc && !IS_LSA_SELF(new)) { | |
2727 | /* RFC 2328 Section 13.2 Summary-LSAs | |
2728 | The best route to the destination described by the summary- | |
2729 | LSA must be recalculated (see Section 16.5). If this | |
2730 | destination is an AS boundary router, it may also be | |
2731 | necessary to re-examine all the AS-external-LSAs. | |
2732 | */ | |
2733 | ospf_spf_calculate_schedule(ospf, | |
2734 | SPF_FLAG_ASBR_SUMMARY_LSA_INSTALL); | |
2735 | } | |
2736 | ||
2737 | /* register LSA to refresh-list. */ | |
2738 | if (IS_LSA_SELF(new)) | |
2739 | ospf_refresher_register_lsa(ospf, new); | |
2740 | ||
2741 | return new; | |
2742 | } | |
2743 | ||
2744 | /* Install AS-external-LSA. */ | |
2745 | static struct ospf_lsa *ospf_external_lsa_install(struct ospf *ospf, | |
2746 | struct ospf_lsa *new, | |
2747 | int rt_recalc) | |
2748 | { | |
2749 | ospf_ase_register_external_lsa(new, ospf); | |
2750 | /* If LSA is not self-originated, calculate an external route. */ | |
2751 | if (rt_recalc) { | |
2752 | /* RFC 2328 Section 13.2 AS-external-LSAs | |
2753 | The best route to the destination described by the AS- | |
2754 | external-LSA must be recalculated (see Section 16.6). | |
2755 | */ | |
2756 | ||
2757 | if (!IS_LSA_SELF(new)) | |
2758 | ospf_ase_incremental_update(ospf, new); | |
2759 | } | |
2760 | ||
2761 | if (new->data->type == OSPF_AS_NSSA_LSA) { | |
2762 | /* There is no point to register selforiginate Type-7 LSA for | |
2763 | * refreshing. We rely on refreshing Type-5 LSA's | |
2764 | */ | |
2765 | if (IS_LSA_SELF(new)) | |
2766 | return new; | |
2767 | else { | |
2768 | /* Try refresh type-5 translated LSA for this LSA, if | |
2769 | * one exists. | |
2770 | * New translations will be taken care of by the | |
2771 | * abr_task. | |
2772 | */ | |
2773 | ospf_translated_nssa_refresh(ospf, new, NULL); | |
2774 | ospf_schedule_abr_task(ospf); | |
2775 | } | |
2776 | } | |
2777 | ||
2778 | /* Register self-originated LSA to refresh queue. | |
2779 | * Leave Translated LSAs alone if NSSA is enabled | |
2780 | */ | |
2781 | if (IS_LSA_SELF(new) && !CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT)) | |
2782 | ospf_refresher_register_lsa(ospf, new); | |
2783 | ||
2784 | return new; | |
2785 | } | |
2786 | ||
2787 | void ospf_discard_from_db(struct ospf *ospf, struct ospf_lsdb *lsdb, | |
2788 | struct ospf_lsa *lsa) | |
2789 | { | |
2790 | struct ospf_lsa *old; | |
2791 | ||
2792 | if (!lsdb) | |
2793 | return; | |
2794 | ||
2795 | old = ospf_lsdb_lookup(lsdb, lsa); | |
2796 | ||
2797 | if (!old) | |
2798 | return; | |
2799 | ||
2800 | if (old->refresh_list >= 0) | |
2801 | ospf_refresher_unregister_lsa(ospf, old); | |
2802 | ||
2803 | switch (old->data->type) { | |
2804 | case OSPF_AS_EXTERNAL_LSA: | |
2805 | ospf_ase_unregister_external_lsa(old, ospf); | |
2806 | ospf_ls_retransmit_delete_nbr_as(ospf, old); | |
2807 | break; | |
2808 | case OSPF_OPAQUE_AS_LSA: | |
2809 | ospf_ls_retransmit_delete_nbr_as(ospf, old); | |
2810 | break; | |
2811 | case OSPF_AS_NSSA_LSA: | |
2812 | ospf_ls_retransmit_delete_nbr_area(old->area, old); | |
2813 | ospf_ase_unregister_external_lsa(old, ospf); | |
2814 | break; | |
2815 | default: | |
2816 | ospf_ls_retransmit_delete_nbr_area(old->area, old); | |
2817 | break; | |
2818 | } | |
2819 | ||
2820 | ospf_lsa_maxage_delete(ospf, old); | |
2821 | ospf_lsa_discard(old); | |
2822 | } | |
2823 | ||
2824 | struct ospf_lsa *ospf_lsa_install(struct ospf *ospf, struct ospf_interface *oi, | |
2825 | struct ospf_lsa *lsa) | |
2826 | { | |
2827 | struct ospf_lsa *new = NULL; | |
2828 | struct ospf_lsa *old = NULL; | |
2829 | struct ospf_lsdb *lsdb = NULL; | |
2830 | int rt_recalc; | |
2831 | ||
2832 | /* Set LSDB. */ | |
2833 | switch (lsa->data->type) { | |
2834 | /* kevinm */ | |
2835 | case OSPF_AS_NSSA_LSA: | |
2836 | if (lsa->area) | |
2837 | lsdb = lsa->area->lsdb; | |
2838 | else | |
2839 | lsdb = ospf->lsdb; | |
2840 | break; | |
2841 | case OSPF_AS_EXTERNAL_LSA: | |
2842 | case OSPF_OPAQUE_AS_LSA: | |
2843 | lsdb = ospf->lsdb; | |
2844 | break; | |
2845 | default: | |
2846 | if (lsa->area) | |
2847 | lsdb = lsa->area->lsdb; | |
2848 | break; | |
2849 | } | |
2850 | ||
2851 | assert(lsdb); | |
2852 | ||
2853 | /* RFC 2328 13.2. Installing LSAs in the database | |
2854 | ||
2855 | Installing a new LSA in the database, either as the result of | |
2856 | flooding or a newly self-originated LSA, may cause the OSPF | |
2857 | routing table structure to be recalculated. The contents of the | |
2858 | new LSA should be compared to the old instance, if present. If | |
2859 | there is no difference, there is no need to recalculate the | |
2860 | routing table. When comparing an LSA to its previous instance, | |
2861 | the following are all considered to be differences in contents: | |
2862 | ||
2863 | o The LSA's Options field has changed. | |
2864 | ||
2865 | o One of the LSA instances has LS age set to MaxAge, and | |
2866 | the other does not. | |
2867 | ||
2868 | o The length field in the LSA header has changed. | |
2869 | ||
2870 | o The body of the LSA (i.e., anything outside the 20-byte | |
2871 | LSA header) has changed. Note that this excludes changes | |
2872 | in LS Sequence Number and LS Checksum. | |
2873 | ||
2874 | */ | |
2875 | /* Look up old LSA and determine if any SPF calculation or incremental | |
2876 | update is needed */ | |
2877 | old = ospf_lsdb_lookup(lsdb, lsa); | |
2878 | ||
2879 | /* Do comparison and record if recalc needed. */ | |
2880 | rt_recalc = 0; | |
2881 | if (old == NULL || ospf_lsa_different(old, lsa, false)) { | |
2882 | /* Ref rfc3623 section 3.2.3 | |
2883 | * Installing new lsa or change in the existing LSA | |
2884 | * or flushing existing LSA leads to topo change | |
2885 | * and trigger SPF caculation. | |
2886 | * So, router should be aborted from HELPER role | |
2887 | * if it is detected as TOPO change. | |
2888 | */ | |
2889 | if (ospf->active_restarter_cnt && | |
2890 | CHECK_LSA_TYPE_1_TO_5_OR_7(lsa->data->type)) { | |
2891 | if (old == NULL || ospf_lsa_different(old, lsa, true)) | |
2892 | ospf_helper_handle_topo_chg(ospf, lsa); | |
2893 | } | |
2894 | ||
2895 | rt_recalc = 1; | |
2896 | } | |
2897 | ||
2898 | /* | |
2899 | Sequence number check (Section 14.1 of rfc 2328) | |
2900 | "Premature aging is used when it is time for a self-originated | |
2901 | LSA's sequence number field to wrap. At this point, the current | |
2902 | LSA instance (having LS sequence number MaxSequenceNumber) must | |
2903 | be prematurely aged and flushed from the routing domain before a | |
2904 | new instance with sequence number equal to InitialSequenceNumber | |
2905 | can be originated. " | |
2906 | */ | |
2907 | ||
2908 | if (ntohl(lsa->data->ls_seqnum) - 1 == OSPF_MAX_SEQUENCE_NUMBER) { | |
2909 | if (ospf_lsa_is_self_originated(ospf, lsa)) { | |
2910 | lsa->data->ls_seqnum = htonl(OSPF_MAX_SEQUENCE_NUMBER); | |
2911 | ||
2912 | if (!IS_LSA_MAXAGE(lsa)) | |
2913 | lsa->flags |= OSPF_LSA_PREMATURE_AGE; | |
2914 | lsa->data->ls_age = htons(OSPF_LSA_MAXAGE); | |
2915 | ||
2916 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) { | |
2917 | zlog_debug( | |
2918 | "%s() Premature Aging lsa %p, seqnum 0x%x", | |
2919 | __func__, lsa, | |
2920 | ntohl(lsa->data->ls_seqnum)); | |
2921 | ospf_lsa_header_dump(lsa->data); | |
2922 | } | |
2923 | } else { | |
2924 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
2925 | zlog_debug( | |
2926 | "%s() got an lsa with seq 0x80000000 that was not self originated. Ignoring", | |
2927 | __func__); | |
2928 | ospf_lsa_header_dump(lsa->data); | |
2929 | } | |
2930 | return old; | |
2931 | } | |
2932 | } | |
2933 | ||
2934 | /* discard old LSA from LSDB */ | |
2935 | if (old != NULL) | |
2936 | ospf_discard_from_db(ospf, lsdb, lsa); | |
2937 | ||
2938 | /* Calculate Checksum if self-originated?. */ | |
2939 | if (IS_LSA_SELF(lsa)) | |
2940 | ospf_lsa_checksum(lsa->data); | |
2941 | ||
2942 | /* Insert LSA to LSDB. */ | |
2943 | ospf_lsdb_add(lsdb, lsa); | |
2944 | lsa->lsdb = lsdb; | |
2945 | ||
2946 | /* Do LSA specific installation process. */ | |
2947 | switch (lsa->data->type) { | |
2948 | case OSPF_ROUTER_LSA: | |
2949 | new = ospf_router_lsa_install(ospf, lsa, rt_recalc); | |
2950 | break; | |
2951 | case OSPF_NETWORK_LSA: | |
2952 | assert(oi); | |
2953 | new = ospf_network_lsa_install(ospf, oi, lsa, rt_recalc); | |
2954 | break; | |
2955 | case OSPF_SUMMARY_LSA: | |
2956 | new = ospf_summary_lsa_install(ospf, lsa, rt_recalc); | |
2957 | break; | |
2958 | case OSPF_ASBR_SUMMARY_LSA: | |
2959 | new = ospf_summary_asbr_lsa_install(ospf, lsa, rt_recalc); | |
2960 | break; | |
2961 | case OSPF_AS_EXTERNAL_LSA: | |
2962 | new = ospf_external_lsa_install(ospf, lsa, rt_recalc); | |
2963 | break; | |
2964 | case OSPF_OPAQUE_LINK_LSA: | |
2965 | if (IS_LSA_SELF(lsa)) | |
2966 | lsa->oi = oi; /* Specify outgoing ospf-interface for | |
2967 | this LSA. */ | |
2968 | else { | |
2969 | /* Incoming "oi" for this LSA has set at LSUpd | |
2970 | * reception. */ | |
2971 | } | |
2972 | /* Fallthrough */ | |
2973 | case OSPF_OPAQUE_AREA_LSA: | |
2974 | case OSPF_OPAQUE_AS_LSA: | |
2975 | new = ospf_opaque_lsa_install(lsa, rt_recalc); | |
2976 | break; | |
2977 | case OSPF_AS_NSSA_LSA: | |
2978 | new = ospf_external_lsa_install(ospf, lsa, rt_recalc); | |
2979 | default: /* type-6,8,9....nothing special */ | |
2980 | break; | |
2981 | } | |
2982 | ||
2983 | if (new == NULL) | |
2984 | return new; /* Installation failed, cannot proceed further -- | |
2985 | endo. */ | |
2986 | ||
2987 | /* Debug logs. */ | |
2988 | if (IS_DEBUG_OSPF(lsa, LSA_INSTALL)) { | |
2989 | switch (lsa->data->type) { | |
2990 | case OSPF_AS_EXTERNAL_LSA: | |
2991 | case OSPF_OPAQUE_AS_LSA: | |
2992 | case OSPF_AS_NSSA_LSA: | |
2993 | zlog_debug("LSA[%s]: Install %s", dump_lsa_key(new), | |
2994 | lookup_msg(ospf_lsa_type_msg, | |
2995 | new->data->type, NULL)); | |
2996 | break; | |
2997 | default: | |
2998 | zlog_debug("LSA[%s]: Install %s to Area %pI4", | |
2999 | dump_lsa_key(new), | |
3000 | lookup_msg(ospf_lsa_type_msg, | |
3001 | new->data->type, NULL), | |
3002 | &new->area->area_id); | |
3003 | break; | |
3004 | } | |
3005 | } | |
3006 | ||
3007 | /* | |
3008 | If received LSA' ls_age is MaxAge, or lsa is being prematurely aged | |
3009 | (it's getting flushed out of the area), set LSA on MaxAge LSA list. | |
3010 | */ | |
3011 | if (IS_LSA_MAXAGE(new)) { | |
3012 | if (IS_DEBUG_OSPF(lsa, LSA_INSTALL)) | |
3013 | zlog_debug("LSA[%s]: Install LSA %p, MaxAge", | |
3014 | dump_lsa_key(new), lsa); | |
3015 | ospf_lsa_maxage(ospf, lsa); | |
3016 | } | |
3017 | ||
3018 | return new; | |
3019 | } | |
3020 | ||
3021 | ||
3022 | int ospf_check_nbr_status(struct ospf *ospf) | |
3023 | { | |
3024 | struct listnode *node, *nnode; | |
3025 | struct ospf_interface *oi; | |
3026 | ||
3027 | for (ALL_LIST_ELEMENTS(ospf->oiflist, node, nnode, oi)) { | |
3028 | struct route_node *rn; | |
3029 | struct ospf_neighbor *nbr; | |
3030 | ||
3031 | if (ospf_if_is_enable(oi)) | |
3032 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3033 | if ((nbr = rn->info) != NULL) | |
3034 | if (nbr->state == NSM_Exchange | |
3035 | || nbr->state == NSM_Loading) { | |
3036 | route_unlock_node(rn); | |
3037 | return 0; | |
3038 | } | |
3039 | } | |
3040 | ||
3041 | return 1; | |
3042 | } | |
3043 | ||
3044 | ||
3045 | void ospf_maxage_lsa_remover(struct event *thread) | |
3046 | { | |
3047 | struct ospf *ospf = EVENT_ARG(thread); | |
3048 | struct ospf_lsa *lsa, *old; | |
3049 | struct route_node *rn; | |
3050 | int reschedule = 0; | |
3051 | ||
3052 | ospf->t_maxage = NULL; | |
3053 | ||
3054 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3055 | zlog_debug("LSA[MaxAge]: remover Start"); | |
3056 | ||
3057 | reschedule = !ospf_check_nbr_status(ospf); | |
3058 | ||
3059 | if (!reschedule) | |
3060 | for (rn = route_top(ospf->maxage_lsa); rn; | |
3061 | rn = route_next(rn)) { | |
3062 | if ((lsa = rn->info) == NULL) { | |
3063 | continue; | |
3064 | } | |
3065 | ||
3066 | /* There is at least one neighbor from which we still | |
3067 | * await an ack | |
3068 | * for that LSA, so we are not allowed to remove it from | |
3069 | * our lsdb yet | |
3070 | * as per RFC 2328 section 14 para 4 a) */ | |
3071 | if (lsa->retransmit_counter > 0) { | |
3072 | reschedule = 1; | |
3073 | continue; | |
3074 | } | |
3075 | ||
3076 | /* TODO: maybe convert this function to a work-queue */ | |
3077 | if (event_should_yield(thread)) { | |
3078 | OSPF_TIMER_ON(ospf->t_maxage, | |
3079 | ospf_maxage_lsa_remover, 0); | |
3080 | route_unlock_node( | |
3081 | rn); /* route_top/route_next */ | |
3082 | return; | |
3083 | } | |
3084 | ||
3085 | /* Remove LSA from the LSDB */ | |
3086 | if (IS_LSA_SELF(lsa)) | |
3087 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3088 | zlog_debug( | |
3089 | "LSA[Type%d:%pI4]: LSA 0x%lx is self-originated: ", | |
3090 | lsa->data->type, | |
3091 | &lsa->data->id, | |
3092 | (unsigned long)lsa); | |
3093 | ||
3094 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3095 | zlog_debug( | |
3096 | "LSA[%s]: MaxAge LSA removed from list", | |
3097 | dump_lsa_key(lsa)); | |
3098 | ||
3099 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_PREMATURE_AGE)) { | |
3100 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3101 | zlog_debug( | |
3102 | "originating new lsa for lsa %p", | |
3103 | lsa); | |
3104 | ospf_lsa_refresh(ospf, lsa); | |
3105 | } | |
3106 | ||
3107 | /* Remove from lsdb. */ | |
3108 | if (lsa->lsdb) { | |
3109 | old = ospf_lsdb_lookup(lsa->lsdb, lsa); | |
3110 | /* The max age LSA here must be the same | |
3111 | * as the LSA in LSDB | |
3112 | */ | |
3113 | if (old != lsa) { | |
3114 | flog_err(EC_OSPF_LSA_MISSING, | |
3115 | "%s: LSA[%s]: LSA not in LSDB", | |
3116 | __func__, dump_lsa_key(lsa)); | |
3117 | ||
3118 | continue; | |
3119 | } | |
3120 | ospf_discard_from_db(ospf, lsa->lsdb, lsa); | |
3121 | ospf_lsdb_delete(lsa->lsdb, lsa); | |
3122 | } else { | |
3123 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3124 | zlog_debug( | |
3125 | "%s: LSA[%s]: No associated LSDB!", | |
3126 | __func__, dump_lsa_key(lsa)); | |
3127 | } | |
3128 | } | |
3129 | ||
3130 | /* A MaxAge LSA must be removed immediately from the router's link | |
3131 | state database as soon as both a) it is no longer contained on any | |
3132 | neighbor Link state retransmission lists and b) none of the | |
3133 | router's | |
3134 | neighbors are in states Exchange or Loading. */ | |
3135 | if (reschedule) | |
3136 | OSPF_TIMER_ON(ospf->t_maxage, ospf_maxage_lsa_remover, | |
3137 | ospf->maxage_delay); | |
3138 | } | |
3139 | ||
3140 | /* This function checks whether an LSA with initial sequence number should be | |
3141 | * originated after a wrap in sequence number | |
3142 | */ | |
3143 | void ospf_check_and_gen_init_seq_lsa(struct ospf_interface *oi, | |
3144 | struct ospf_lsa *recv_lsa) | |
3145 | { | |
3146 | struct ospf_lsa *lsa = NULL; | |
3147 | struct ospf *ospf = oi->ospf; | |
3148 | ||
3149 | lsa = ospf_lsa_lookup_by_header(oi->area, recv_lsa->data); | |
3150 | ||
3151 | if ((lsa == NULL) || (!CHECK_FLAG(lsa->flags, OSPF_LSA_PREMATURE_AGE)) | |
3152 | || (lsa->retransmit_counter != 0)) { | |
3153 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
3154 | zlog_debug( | |
3155 | "Do not generate LSA with initial seqence number."); | |
3156 | return; | |
3157 | } | |
3158 | ||
3159 | ospf_lsa_maxage_delete(ospf, lsa); | |
3160 | ||
3161 | lsa->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
3162 | ||
3163 | ospf_lsa_refresh(ospf, lsa); | |
3164 | } | |
3165 | ||
3166 | void ospf_lsa_maxage_delete(struct ospf *ospf, struct ospf_lsa *lsa) | |
3167 | { | |
3168 | struct route_node *rn; | |
3169 | struct prefix lsa_prefix; | |
3170 | ||
3171 | memset(&lsa_prefix, 0, sizeof(lsa_prefix)); | |
3172 | lsa_prefix.family = AF_UNSPEC; | |
3173 | lsa_prefix.prefixlen = sizeof(lsa_prefix.u.ptr) * CHAR_BIT; | |
3174 | lsa_prefix.u.ptr = (uintptr_t)lsa; | |
3175 | ||
3176 | if ((rn = route_node_lookup(ospf->maxage_lsa, &lsa_prefix))) { | |
3177 | if (rn->info == lsa) { | |
3178 | UNSET_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE); | |
3179 | ospf_lsa_unlock(&lsa); /* maxage_lsa */ | |
3180 | rn->info = NULL; | |
3181 | route_unlock_node( | |
3182 | rn); /* unlock node because lsa is deleted */ | |
3183 | } | |
3184 | route_unlock_node(rn); /* route_node_lookup */ | |
3185 | } else { | |
3186 | if (IS_DEBUG_OSPF_EVENT) | |
3187 | zlog_debug("%s: lsa %s is not found in maxage db.", | |
3188 | __func__, dump_lsa_key(lsa)); | |
3189 | } | |
3190 | } | |
3191 | ||
3192 | /* Add LSA onto the MaxAge list, and schedule for removal. | |
3193 | * This does *not* lead to the LSA being flooded, that must be taken | |
3194 | * care of elsewhere, see, e.g., ospf_lsa_flush* (which are callers of this | |
3195 | * function). | |
3196 | */ | |
3197 | void ospf_lsa_maxage(struct ospf *ospf, struct ospf_lsa *lsa) | |
3198 | { | |
3199 | struct prefix lsa_prefix; | |
3200 | struct route_node *rn; | |
3201 | ||
3202 | /* When we saw a MaxAge LSA flooded to us, we put it on the list | |
3203 | and schedule the MaxAge LSA remover. */ | |
3204 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE)) { | |
3205 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3206 | zlog_debug( | |
3207 | "LSA[%s]: %p already exists on MaxAge LSA list", | |
3208 | dump_lsa_key(lsa), lsa); | |
3209 | return; | |
3210 | } | |
3211 | ||
3212 | memset(&lsa_prefix, 0, sizeof(lsa_prefix)); | |
3213 | lsa_prefix.family = AF_UNSPEC; | |
3214 | lsa_prefix.prefixlen = sizeof(lsa_prefix.u.ptr) * CHAR_BIT; | |
3215 | lsa_prefix.u.ptr = (uintptr_t)lsa; | |
3216 | ||
3217 | rn = route_node_get(ospf->maxage_lsa, &lsa_prefix); | |
3218 | if (rn->info != NULL) { | |
3219 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3220 | zlog_debug( | |
3221 | "LSA[%s]: found LSA (%p) in table for LSA %p %d", | |
3222 | dump_lsa_key(lsa), rn->info, | |
3223 | (void *)lsa, lsa_prefix.prefixlen); | |
3224 | route_unlock_node(rn); | |
3225 | } else { | |
3226 | rn->info = ospf_lsa_lock(lsa); | |
3227 | SET_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE); | |
3228 | } | |
3229 | ||
3230 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3231 | zlog_debug("LSA[%s]: MaxAge LSA remover scheduled.", | |
3232 | dump_lsa_key(lsa)); | |
3233 | ||
3234 | OSPF_TIMER_ON(ospf->t_maxage, ospf_maxage_lsa_remover, | |
3235 | ospf->maxage_delay); | |
3236 | } | |
3237 | ||
3238 | static int ospf_lsa_maxage_walker_remover(struct ospf *ospf, | |
3239 | struct ospf_lsa *lsa) | |
3240 | { | |
3241 | /* Stay away from any Local Translated Type-7 LSAs */ | |
3242 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
3243 | return 0; | |
3244 | ||
3245 | if (IS_LSA_MAXAGE(lsa)) | |
3246 | /* Self-originated LSAs should NOT time-out instead, | |
3247 | they're flushed and submitted to the max_age list explicitly. | |
3248 | */ | |
3249 | if (!ospf_lsa_is_self_originated(ospf, lsa)) { | |
3250 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3251 | zlog_debug("LSA[%s]: is MaxAge", | |
3252 | dump_lsa_key(lsa)); | |
3253 | ||
3254 | switch (lsa->data->type) { | |
3255 | case OSPF_OPAQUE_LINK_LSA: | |
3256 | case OSPF_OPAQUE_AREA_LSA: | |
3257 | case OSPF_OPAQUE_AS_LSA: | |
3258 | /* | |
3259 | * As a general rule, whenever network topology | |
3260 | * has changed | |
3261 | * (due to an LSA removal in this case), routing | |
3262 | * recalculation | |
3263 | * should be triggered. However, this is not | |
3264 | * true for opaque | |
3265 | * LSAs. Even if an opaque LSA instance is going | |
3266 | * to be removed | |
3267 | * from the routing domain, it does not mean a | |
3268 | * change in network | |
3269 | * topology, and thus, routing recalculation is | |
3270 | * not needed here. | |
3271 | */ | |
3272 | break; | |
3273 | case OSPF_AS_EXTERNAL_LSA: | |
3274 | case OSPF_AS_NSSA_LSA: | |
3275 | ospf_ase_incremental_update(ospf, lsa); | |
3276 | break; | |
3277 | default: | |
3278 | ospf_spf_calculate_schedule(ospf, | |
3279 | SPF_FLAG_MAXAGE); | |
3280 | break; | |
3281 | } | |
3282 | ospf_lsa_maxage(ospf, lsa); | |
3283 | } | |
3284 | ||
3285 | if (IS_LSA_MAXAGE(lsa) && !ospf_lsa_is_self_originated(ospf, lsa)) | |
3286 | if (LS_AGE(lsa) > OSPF_LSA_MAXAGE + 30) | |
3287 | printf("Eek! Shouldn't happen!\n"); | |
3288 | ||
3289 | return 0; | |
3290 | } | |
3291 | ||
3292 | /* Periodical check of MaxAge LSA. */ | |
3293 | void ospf_lsa_maxage_walker(struct event *thread) | |
3294 | { | |
3295 | struct ospf *ospf = EVENT_ARG(thread); | |
3296 | struct route_node *rn; | |
3297 | struct ospf_lsa *lsa; | |
3298 | struct ospf_area *area; | |
3299 | struct listnode *node, *nnode; | |
3300 | ||
3301 | ospf->t_maxage_walker = NULL; | |
3302 | ||
3303 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
3304 | LSDB_LOOP (ROUTER_LSDB(area), rn, lsa) | |
3305 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3306 | LSDB_LOOP (NETWORK_LSDB(area), rn, lsa) | |
3307 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3308 | LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa) | |
3309 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3310 | LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa) | |
3311 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3312 | LSDB_LOOP (OPAQUE_AREA_LSDB(area), rn, lsa) | |
3313 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3314 | LSDB_LOOP (OPAQUE_LINK_LSDB(area), rn, lsa) | |
3315 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3316 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) | |
3317 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3318 | } | |
3319 | ||
3320 | /* for AS-external-LSAs. */ | |
3321 | if (ospf->lsdb) { | |
3322 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) | |
3323 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3324 | LSDB_LOOP (OPAQUE_AS_LSDB(ospf), rn, lsa) | |
3325 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3326 | } | |
3327 | ||
3328 | OSPF_TIMER_ON(ospf->t_maxage_walker, ospf_lsa_maxage_walker, | |
3329 | OSPF_LSA_MAXAGE_CHECK_INTERVAL); | |
3330 | } | |
3331 | ||
3332 | struct ospf_lsa *ospf_lsa_lookup_by_prefix(struct ospf_lsdb *lsdb, uint8_t type, | |
3333 | struct prefix_ipv4 *p, | |
3334 | struct in_addr router_id) | |
3335 | { | |
3336 | struct ospf_lsa *lsa; | |
3337 | struct in_addr mask, id; | |
3338 | struct lsa_header_mask { | |
3339 | struct lsa_header header; | |
3340 | struct in_addr mask; | |
3341 | } * hmask; | |
3342 | ||
3343 | lsa = ospf_lsdb_lookup_by_id(lsdb, type, p->prefix, router_id); | |
3344 | if (lsa == NULL) | |
3345 | return NULL; | |
3346 | ||
3347 | masklen2ip(p->prefixlen, &mask); | |
3348 | ||
3349 | hmask = (struct lsa_header_mask *)lsa->data; | |
3350 | ||
3351 | if (mask.s_addr != hmask->mask.s_addr) { | |
3352 | id.s_addr = p->prefix.s_addr | (~mask.s_addr); | |
3353 | lsa = ospf_lsdb_lookup_by_id(lsdb, type, id, router_id); | |
3354 | if (!lsa) | |
3355 | return NULL; | |
3356 | } | |
3357 | ||
3358 | return lsa; | |
3359 | } | |
3360 | ||
3361 | struct ospf_lsa *ospf_lsa_lookup(struct ospf *ospf, struct ospf_area *area, | |
3362 | uint32_t type, struct in_addr id, | |
3363 | struct in_addr adv_router) | |
3364 | { | |
3365 | if (!ospf) | |
3366 | return NULL; | |
3367 | ||
3368 | switch (type) { | |
3369 | case OSPF_ROUTER_LSA: | |
3370 | case OSPF_NETWORK_LSA: | |
3371 | case OSPF_SUMMARY_LSA: | |
3372 | case OSPF_ASBR_SUMMARY_LSA: | |
3373 | case OSPF_AS_NSSA_LSA: | |
3374 | case OSPF_OPAQUE_LINK_LSA: | |
3375 | case OSPF_OPAQUE_AREA_LSA: | |
3376 | return ospf_lsdb_lookup_by_id(area->lsdb, type, id, adv_router); | |
3377 | case OSPF_AS_EXTERNAL_LSA: | |
3378 | case OSPF_OPAQUE_AS_LSA: | |
3379 | return ospf_lsdb_lookup_by_id(ospf->lsdb, type, id, adv_router); | |
3380 | default: | |
3381 | break; | |
3382 | } | |
3383 | ||
3384 | return NULL; | |
3385 | } | |
3386 | ||
3387 | struct ospf_lsa *ospf_lsa_lookup_by_id(struct ospf_area *area, uint32_t type, | |
3388 | struct in_addr id) | |
3389 | { | |
3390 | struct ospf_lsa *lsa; | |
3391 | struct route_node *rn; | |
3392 | ||
3393 | switch (type) { | |
3394 | case OSPF_ROUTER_LSA: | |
3395 | return ospf_lsdb_lookup_by_id(area->lsdb, type, id, id); | |
3396 | case OSPF_NETWORK_LSA: | |
3397 | for (rn = route_top(NETWORK_LSDB(area)); rn; | |
3398 | rn = route_next(rn)) | |
3399 | if ((lsa = rn->info)) | |
3400 | if (IPV4_ADDR_SAME(&lsa->data->id, &id)) { | |
3401 | route_unlock_node(rn); | |
3402 | return lsa; | |
3403 | } | |
3404 | break; | |
3405 | case OSPF_SUMMARY_LSA: | |
3406 | case OSPF_ASBR_SUMMARY_LSA: | |
3407 | /* Currently not used. */ | |
3408 | assert(1); | |
3409 | return ospf_lsdb_lookup_by_id(area->lsdb, type, id, id); | |
3410 | case OSPF_AS_EXTERNAL_LSA: | |
3411 | case OSPF_AS_NSSA_LSA: | |
3412 | case OSPF_OPAQUE_LINK_LSA: | |
3413 | case OSPF_OPAQUE_AREA_LSA: | |
3414 | case OSPF_OPAQUE_AS_LSA: | |
3415 | /* Currently not used. */ | |
3416 | break; | |
3417 | default: | |
3418 | break; | |
3419 | } | |
3420 | ||
3421 | return NULL; | |
3422 | } | |
3423 | ||
3424 | struct ospf_lsa *ospf_lsa_lookup_by_header(struct ospf_area *area, | |
3425 | struct lsa_header *lsah) | |
3426 | { | |
3427 | struct ospf_lsa *match; | |
3428 | ||
3429 | /* | |
3430 | * Strictly speaking, the LSA-ID field for Opaque-LSAs (type-9/10/11) | |
3431 | * is redefined to have two subfields; opaque-type and opaque-id. | |
3432 | * However, it is harmless to treat the two sub fields together, as if | |
3433 | * they two were forming a unique LSA-ID. | |
3434 | */ | |
3435 | ||
3436 | match = ospf_lsa_lookup(area->ospf, area, lsah->type, lsah->id, | |
3437 | lsah->adv_router); | |
3438 | ||
3439 | if (match == NULL) | |
3440 | if (IS_DEBUG_OSPF(lsa, LSA) == OSPF_DEBUG_LSA) | |
3441 | zlog_debug("LSA[Type%d:%pI4]: Lookup by header, NO MATCH", | |
3442 | lsah->type, &lsah->id); | |
3443 | ||
3444 | return match; | |
3445 | } | |
3446 | ||
3447 | /* return +n, l1 is more recent. | |
3448 | return -n, l2 is more recent. | |
3449 | return 0, l1 and l2 is identical. */ | |
3450 | int ospf_lsa_more_recent(struct ospf_lsa *l1, struct ospf_lsa *l2) | |
3451 | { | |
3452 | int r; | |
3453 | int x, y; | |
3454 | ||
3455 | if (l1 == NULL && l2 == NULL) | |
3456 | return 0; | |
3457 | if (l1 == NULL) | |
3458 | return -1; | |
3459 | if (l2 == NULL) | |
3460 | return 1; | |
3461 | ||
3462 | /* compare LS sequence number. */ | |
3463 | x = (int)ntohl(l1->data->ls_seqnum); | |
3464 | y = (int)ntohl(l2->data->ls_seqnum); | |
3465 | if (x > y) | |
3466 | return 1; | |
3467 | if (x < y) | |
3468 | return -1; | |
3469 | ||
3470 | /* compare LS checksum. */ | |
3471 | r = ntohs(l1->data->checksum) - ntohs(l2->data->checksum); | |
3472 | if (r) | |
3473 | return r; | |
3474 | ||
3475 | /* compare LS age. */ | |
3476 | if (IS_LSA_MAXAGE(l1) && !IS_LSA_MAXAGE(l2)) | |
3477 | return 1; | |
3478 | else if (!IS_LSA_MAXAGE(l1) && IS_LSA_MAXAGE(l2)) | |
3479 | return -1; | |
3480 | ||
3481 | /* compare LS age with MaxAgeDiff. */ | |
3482 | if (LS_AGE(l1) - LS_AGE(l2) > OSPF_LSA_MAXAGE_DIFF) | |
3483 | return -1; | |
3484 | else if (LS_AGE(l2) - LS_AGE(l1) > OSPF_LSA_MAXAGE_DIFF) | |
3485 | return 1; | |
3486 | ||
3487 | /* LSAs are identical. */ | |
3488 | return 0; | |
3489 | } | |
3490 | ||
3491 | /* | |
3492 | * Check if two LSAs are different. | |
3493 | * | |
3494 | * l1 | |
3495 | * The first LSA to compare. | |
3496 | * | |
3497 | * l2 | |
3498 | * The second LSA to compare. | |
3499 | * | |
3500 | * ignore_rcvd_flag | |
3501 | * When set to true, ignore whether the LSAs were received from the network | |
3502 | * or not. This parameter should be set to true when checking for topology | |
3503 | * changes as part of the Graceful Restart helper neighbor procedures. | |
3504 | * | |
3505 | * Returns: | |
3506 | * true if the LSAs are different, false otherwise. | |
3507 | */ | |
3508 | int ospf_lsa_different(struct ospf_lsa *l1, struct ospf_lsa *l2, | |
3509 | bool ignore_rcvd_flag) | |
3510 | { | |
3511 | char *p1, *p2; | |
3512 | assert(l1); | |
3513 | assert(l2); | |
3514 | assert(l1->data); | |
3515 | assert(l2->data); | |
3516 | ||
3517 | if (l1->data->options != l2->data->options) | |
3518 | return 1; | |
3519 | ||
3520 | if (IS_LSA_MAXAGE(l1) && !IS_LSA_MAXAGE(l2)) | |
3521 | return 1; | |
3522 | ||
3523 | if (IS_LSA_MAXAGE(l2) && !IS_LSA_MAXAGE(l1)) | |
3524 | return 1; | |
3525 | ||
3526 | if (l1->size != l2->size) | |
3527 | return 1; | |
3528 | ||
3529 | if (l1->size == 0) | |
3530 | return 1; | |
3531 | ||
3532 | if (!ignore_rcvd_flag | |
3533 | && CHECK_FLAG((l1->flags ^ l2->flags), OSPF_LSA_RECEIVED)) | |
3534 | return 1; /* May be a stale LSA in the LSBD */ | |
3535 | ||
3536 | if (l1->size == OSPF_LSA_HEADER_SIZE) | |
3537 | return 0; /* nothing to compare */ | |
3538 | ||
3539 | p1 = (char *)l1->data; | |
3540 | p2 = (char *)l2->data; | |
3541 | ||
3542 | if (memcmp(p1 + OSPF_LSA_HEADER_SIZE, p2 + OSPF_LSA_HEADER_SIZE, | |
3543 | l1->size - OSPF_LSA_HEADER_SIZE) | |
3544 | != 0) | |
3545 | return 1; | |
3546 | ||
3547 | return 0; | |
3548 | } | |
3549 | ||
3550 | int ospf_lsa_flush_schedule(struct ospf *ospf, struct ospf_lsa *lsa) | |
3551 | { | |
3552 | if (lsa == NULL || !IS_LSA_SELF(lsa)) | |
3553 | return 0; | |
3554 | ||
3555 | if (IS_DEBUG_OSPF_EVENT) | |
3556 | zlog_debug( | |
3557 | "LSA[Type%d:%pI4]: Schedule self-originated LSA to FLUSH", | |
3558 | lsa->data->type, &lsa->data->id); | |
3559 | ||
3560 | /* Force given lsa's age to MaxAge. */ | |
3561 | lsa->data->ls_age = htons(OSPF_LSA_MAXAGE); | |
3562 | ||
3563 | switch (lsa->data->type) { | |
3564 | /* Opaque wants to be notified of flushes */ | |
3565 | case OSPF_OPAQUE_LINK_LSA: | |
3566 | case OSPF_OPAQUE_AREA_LSA: | |
3567 | case OSPF_OPAQUE_AS_LSA: | |
3568 | ospf_opaque_lsa_refresh(lsa); | |
3569 | break; | |
3570 | default: | |
3571 | ospf_refresher_unregister_lsa(ospf, lsa); | |
3572 | ospf_lsa_flush(ospf, lsa); | |
3573 | break; | |
3574 | } | |
3575 | ||
3576 | return 0; | |
3577 | } | |
3578 | ||
3579 | void ospf_flush_self_originated_lsas_now(struct ospf *ospf) | |
3580 | { | |
3581 | struct listnode *node, *nnode; | |
3582 | struct listnode *node2, *nnode2; | |
3583 | struct ospf_area *area; | |
3584 | struct ospf_interface *oi; | |
3585 | struct ospf_lsa *lsa; | |
3586 | struct route_node *rn; | |
3587 | struct ospf_if_params *oip; | |
3588 | int need_to_flush_ase = 0; | |
3589 | ||
3590 | ospf->inst_shutdown = 1; | |
3591 | ||
3592 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
3593 | if ((lsa = area->router_lsa_self) != NULL) { | |
3594 | if (IS_DEBUG_OSPF_EVENT) | |
3595 | zlog_debug( | |
3596 | "LSA[Type%d:%pI4]: Schedule self-originated LSA to FLUSH", | |
3597 | lsa->data->type, | |
3598 | &lsa->data->id); | |
3599 | ||
3600 | ospf_refresher_unregister_lsa(ospf, lsa); | |
3601 | ospf_lsa_flush_area(lsa, area); | |
3602 | ospf_lsa_unlock(&area->router_lsa_self); | |
3603 | area->router_lsa_self = NULL; | |
3604 | } | |
3605 | ||
3606 | for (ALL_LIST_ELEMENTS(area->oiflist, node2, nnode2, oi)) { | |
3607 | if ((lsa = oi->network_lsa_self) != NULL | |
3608 | && oi->state == ISM_DR && oi->full_nbrs > 0) { | |
3609 | if (IS_DEBUG_OSPF_EVENT) | |
3610 | zlog_debug( | |
3611 | "LSA[Type%d:%pI4]: Schedule self-originated LSA to FLUSH", | |
3612 | lsa->data->type, | |
3613 | &lsa->data->id); | |
3614 | ||
3615 | ospf_refresher_unregister_lsa( | |
3616 | ospf, oi->network_lsa_self); | |
3617 | ospf_lsa_flush_area(oi->network_lsa_self, area); | |
3618 | ospf_lsa_unlock(&oi->network_lsa_self); | |
3619 | oi->network_lsa_self = NULL; | |
3620 | ||
3621 | oip = ospf_lookup_if_params( | |
3622 | oi->ifp, oi->address->u.prefix4); | |
3623 | if (oip) | |
3624 | oip->network_lsa_seqnum = htonl( | |
3625 | OSPF_INVALID_SEQUENCE_NUMBER); | |
3626 | } | |
3627 | ||
3628 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK | |
3629 | && area->external_routing == OSPF_AREA_DEFAULT) | |
3630 | need_to_flush_ase = 1; | |
3631 | } | |
3632 | ||
3633 | LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa) | |
3634 | ospf_lsa_flush_schedule(ospf, lsa); | |
3635 | LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa) | |
3636 | ospf_lsa_flush_schedule(ospf, lsa); | |
3637 | LSDB_LOOP (OPAQUE_LINK_LSDB(area), rn, lsa) | |
3638 | ospf_lsa_flush_schedule(ospf, lsa); | |
3639 | LSDB_LOOP (OPAQUE_AREA_LSDB(area), rn, lsa) | |
3640 | ospf_lsa_flush_schedule(ospf, lsa); | |
3641 | } | |
3642 | ||
3643 | if (need_to_flush_ase) { | |
3644 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) | |
3645 | ospf_lsa_flush_schedule(ospf, lsa); | |
3646 | LSDB_LOOP (OPAQUE_AS_LSDB(ospf), rn, lsa) | |
3647 | ospf_lsa_flush_schedule(ospf, lsa); | |
3648 | } | |
3649 | ||
3650 | /* | |
3651 | * Make sure that the MaxAge LSA remover is executed immediately, | |
3652 | * without conflicting to other threads. | |
3653 | */ | |
3654 | if (ospf->t_maxage != NULL) { | |
3655 | EVENT_OFF(ospf->t_maxage); | |
3656 | event_execute(master, ospf_maxage_lsa_remover, ospf, 0); | |
3657 | } | |
3658 | ||
3659 | return; | |
3660 | } | |
3661 | ||
3662 | /** @brief Function to refresh all the self originated | |
3663 | * LSAs for area, when FR state change happens. | |
3664 | * @param area pointer. | |
3665 | * @return Void. | |
3666 | */ | |
3667 | void ospf_refresh_area_self_lsas(struct ospf_area *area) | |
3668 | { | |
3669 | struct listnode *node2; | |
3670 | struct listnode *nnode2; | |
3671 | struct ospf_interface *oi; | |
3672 | struct route_node *rn; | |
3673 | struct ospf_lsa *lsa; | |
3674 | ||
3675 | if (!area) | |
3676 | return; | |
3677 | ||
3678 | if (area->router_lsa_self) | |
3679 | ospf_lsa_refresh(area->ospf, area->router_lsa_self); | |
3680 | ||
3681 | for (ALL_LIST_ELEMENTS(area->oiflist, node2, nnode2, oi)) | |
3682 | if (oi->network_lsa_self) | |
3683 | ospf_lsa_refresh(oi->ospf, oi->network_lsa_self); | |
3684 | ||
3685 | LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa) | |
3686 | if (IS_LSA_SELF(lsa)) | |
3687 | ospf_lsa_refresh(area->ospf, lsa); | |
3688 | LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa) | |
3689 | if (IS_LSA_SELF(lsa)) | |
3690 | ospf_lsa_refresh(area->ospf, lsa); | |
3691 | LSDB_LOOP (OPAQUE_LINK_LSDB(area), rn, lsa) | |
3692 | if (IS_LSA_SELF(lsa)) | |
3693 | ospf_lsa_refresh(area->ospf, lsa); | |
3694 | LSDB_LOOP (OPAQUE_AREA_LSDB(area), rn, lsa) | |
3695 | if (IS_LSA_SELF(lsa)) | |
3696 | ospf_lsa_refresh(area->ospf, lsa); | |
3697 | LSDB_LOOP (EXTERNAL_LSDB(area->ospf), rn, lsa) | |
3698 | if (IS_LSA_SELF(lsa)) | |
3699 | ospf_lsa_refresh(area->ospf, lsa); | |
3700 | LSDB_LOOP (OPAQUE_AS_LSDB(area->ospf), rn, lsa) | |
3701 | if (IS_LSA_SELF(lsa)) | |
3702 | ospf_lsa_refresh(area->ospf, lsa); | |
3703 | } | |
3704 | ||
3705 | /* If there is self-originated LSA, then return 1, otherwise return 0. */ | |
3706 | /* An interface-independent version of ospf_lsa_is_self_originated */ | |
3707 | int ospf_lsa_is_self_originated(struct ospf *ospf, struct ospf_lsa *lsa) | |
3708 | { | |
3709 | struct listnode *node; | |
3710 | struct ospf_interface *oi; | |
3711 | ||
3712 | /* This LSA is already checked. */ | |
3713 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_SELF_CHECKED)) | |
3714 | return IS_LSA_SELF(lsa); | |
3715 | ||
3716 | /* Make sure LSA is self-checked. */ | |
3717 | SET_FLAG(lsa->flags, OSPF_LSA_SELF_CHECKED); | |
3718 | ||
3719 | /* AdvRouter and Router ID is the same. */ | |
3720 | if (IPV4_ADDR_SAME(&lsa->data->adv_router, &ospf->router_id)) | |
3721 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
3722 | ||
3723 | /* LSA is router-LSA. */ | |
3724 | else if (lsa->data->type == OSPF_ROUTER_LSA | |
3725 | && IPV4_ADDR_SAME(&lsa->data->id, &ospf->router_id)) | |
3726 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
3727 | ||
3728 | /* LSA is network-LSA. Compare Link ID with all interfaces. */ | |
3729 | else if (lsa->data->type == OSPF_NETWORK_LSA) | |
3730 | for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) { | |
3731 | /* Ignore virtual link. */ | |
3732 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
3733 | if (oi->address->family == AF_INET) | |
3734 | if (IPV4_ADDR_SAME( | |
3735 | &lsa->data->id, | |
3736 | &oi->address->u.prefix4)) { | |
3737 | /* to make it easier later */ | |
3738 | SET_FLAG(lsa->flags, | |
3739 | OSPF_LSA_SELF); | |
3740 | return IS_LSA_SELF(lsa); | |
3741 | } | |
3742 | } | |
3743 | ||
3744 | return IS_LSA_SELF(lsa); | |
3745 | } | |
3746 | ||
3747 | /* Get unique Link State ID. */ | |
3748 | enum lsid_status ospf_lsa_unique_id(struct ospf *ospf, struct ospf_lsdb *lsdb, | |
3749 | uint8_t type, struct prefix_ipv4 *p, | |
3750 | struct in_addr *id) | |
3751 | { | |
3752 | struct ospf_lsa *lsa; | |
3753 | struct in_addr mask; | |
3754 | ||
3755 | *id = p->prefix; | |
3756 | ||
3757 | /* Check existence of LSA instance. */ | |
3758 | lsa = ospf_lsdb_lookup_by_id(lsdb, type, *id, ospf->router_id); | |
3759 | if (lsa) { | |
3760 | struct as_external_lsa *al = | |
3761 | (struct as_external_lsa *)lsa->data; | |
3762 | /* Ref rfc2328,Appendex E.1 | |
3763 | * If router already originated the external lsa with lsid | |
3764 | * as the current prefix, and the masklens are same then | |
3765 | * terminate the LSID algorithem. | |
3766 | */ | |
3767 | if (ip_masklen(al->mask) == p->prefixlen) { | |
3768 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
3769 | zlog_debug( | |
3770 | "%s: Can't get Link State ID for %pFX", | |
3771 | __func__, p); | |
3772 | /* id.s_addr = 0; */ | |
3773 | id->s_addr = 0xffffffff; | |
3774 | return LSID_NOT_AVAILABLE; | |
3775 | } else if (ip_masklen(al->mask) < p->prefixlen) { | |
3776 | /* Ref rfc2328,Appendex E.2 | |
3777 | * the current prefix masklen is greater than the | |
3778 | * existing LSA, then generate the Link state ID, | |
3779 | * by setting all host bits in prefix addressa and | |
3780 | * originate. | |
3781 | * | |
3782 | * Eg: 1st Route : 10.0.0.0/16 - LSID:10.0.0.0 | |
3783 | * 2nd Route : 10.0.0.0/24 - LSID:10.0.0.255 | |
3784 | */ | |
3785 | masklen2ip(p->prefixlen, &mask); | |
3786 | ||
3787 | id->s_addr = p->prefix.s_addr | (~mask.s_addr); | |
3788 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, type, *id, | |
3789 | ospf->router_id); | |
3790 | if (lsa) { | |
3791 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
3792 | zlog_debug( | |
3793 | "%s: Can't get Link State ID for %pFX", | |
3794 | __func__, p); | |
3795 | id->s_addr = 0xffffffff; | |
3796 | return LSID_NOT_AVAILABLE; | |
3797 | } | |
3798 | } else { | |
3799 | /* Ref rfc2328,Appendex E.3 | |
3800 | * the current prefix masklen is lesser than the | |
3801 | * existing LSA,then the originated LSA has to be | |
3802 | * refreshed by modifying masklen, cost and tag. | |
3803 | * Originate the old route info with new LSID by | |
3804 | * setting the host bits in prefix address. | |
3805 | * | |
3806 | * Eg: 1st Route : 10.0.0.0/24 - LSID:10.0.0.0 | |
3807 | * 2nd Route : 10.0.0.0/16 - ? | |
3808 | * Since 2nd route mask len is less than firstone | |
3809 | * LSID has to be changed. | |
3810 | * 1st route LSID:10.0.0.255 | |
3811 | * 2nd route LSID:10.0.0.0 | |
3812 | */ | |
3813 | id->s_addr = lsa->data->id.s_addr | (~al->mask.s_addr); | |
3814 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, type, *id, | |
3815 | ospf->router_id); | |
3816 | if (lsa && (ip_masklen(al->mask) != IPV4_MAX_BITLEN)) { | |
3817 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
3818 | zlog_debug( | |
3819 | "%s: Can't get Link State ID for %pFX", | |
3820 | __func__, p); | |
3821 | id->s_addr = 0xffffffff; | |
3822 | return LSID_NOT_AVAILABLE; | |
3823 | } | |
3824 | return LSID_CHANGE; | |
3825 | } | |
3826 | } | |
3827 | ||
3828 | return LSID_AVAILABLE; | |
3829 | } | |
3830 | ||
3831 | ||
3832 | #define LSA_ACTION_FLOOD_AREA 1 | |
3833 | #define LSA_ACTION_FLUSH_AREA 2 | |
3834 | ||
3835 | struct lsa_action { | |
3836 | uint8_t action; | |
3837 | struct ospf_area *area; | |
3838 | struct ospf_lsa *lsa; | |
3839 | }; | |
3840 | ||
3841 | static void ospf_lsa_action(struct event *t) | |
3842 | { | |
3843 | struct lsa_action *data; | |
3844 | ||
3845 | data = EVENT_ARG(t); | |
3846 | ||
3847 | if (IS_DEBUG_OSPF(lsa, LSA) == OSPF_DEBUG_LSA) | |
3848 | zlog_debug("LSA[Action]: Performing scheduled LSA action: %d", | |
3849 | data->action); | |
3850 | ||
3851 | switch (data->action) { | |
3852 | case LSA_ACTION_FLOOD_AREA: | |
3853 | ospf_flood_through_area(data->area, NULL, data->lsa); | |
3854 | break; | |
3855 | case LSA_ACTION_FLUSH_AREA: | |
3856 | ospf_lsa_flush_area(data->lsa, data->area); | |
3857 | break; | |
3858 | } | |
3859 | ||
3860 | ospf_lsa_unlock(&data->lsa); /* Message */ | |
3861 | XFREE(MTYPE_OSPF_MESSAGE, data); | |
3862 | } | |
3863 | ||
3864 | void ospf_schedule_lsa_flood_area(struct ospf_area *area, struct ospf_lsa *lsa) | |
3865 | { | |
3866 | struct lsa_action *data; | |
3867 | ||
3868 | data = XCALLOC(MTYPE_OSPF_MESSAGE, sizeof(struct lsa_action)); | |
3869 | data->action = LSA_ACTION_FLOOD_AREA; | |
3870 | data->area = area; | |
3871 | data->lsa = ospf_lsa_lock(lsa); /* Message / Flood area */ | |
3872 | ||
3873 | event_add_event(master, ospf_lsa_action, data, 0, NULL); | |
3874 | } | |
3875 | ||
3876 | void ospf_schedule_lsa_flush_area(struct ospf_area *area, struct ospf_lsa *lsa) | |
3877 | { | |
3878 | struct lsa_action *data; | |
3879 | ||
3880 | data = XCALLOC(MTYPE_OSPF_MESSAGE, sizeof(struct lsa_action)); | |
3881 | data->action = LSA_ACTION_FLUSH_AREA; | |
3882 | data->area = area; | |
3883 | data->lsa = ospf_lsa_lock(lsa); /* Message / Flush area */ | |
3884 | ||
3885 | event_add_event(master, ospf_lsa_action, data, 0, NULL); | |
3886 | } | |
3887 | ||
3888 | ||
3889 | /* LSA Refreshment functions. */ | |
3890 | struct ospf_lsa *ospf_lsa_refresh(struct ospf *ospf, struct ospf_lsa *lsa) | |
3891 | { | |
3892 | struct external_info *ei; | |
3893 | struct ospf_external_aggr_rt *aggr; | |
3894 | struct ospf_lsa *new = NULL; | |
3895 | struct as_external_lsa *al; | |
3896 | struct prefix_ipv4 p; | |
3897 | ||
3898 | assert(CHECK_FLAG(lsa->flags, OSPF_LSA_SELF)); | |
3899 | assert(IS_LSA_SELF(lsa)); | |
3900 | assert(lsa->lock > 0); | |
3901 | ||
3902 | switch (lsa->data->type) { | |
3903 | /* Router and Network LSAs are processed differently. */ | |
3904 | case OSPF_ROUTER_LSA: | |
3905 | new = ospf_router_lsa_refresh(lsa); | |
3906 | break; | |
3907 | case OSPF_NETWORK_LSA: | |
3908 | new = ospf_network_lsa_refresh(lsa); | |
3909 | break; | |
3910 | case OSPF_SUMMARY_LSA: | |
3911 | new = ospf_summary_lsa_refresh(ospf, lsa); | |
3912 | break; | |
3913 | case OSPF_ASBR_SUMMARY_LSA: | |
3914 | new = ospf_summary_asbr_lsa_refresh(ospf, lsa); | |
3915 | break; | |
3916 | case OSPF_AS_EXTERNAL_LSA: | |
3917 | /* Translated from NSSA Type-5s are refreshed when | |
3918 | * from refresh of Type-7 - do not refresh these directly. | |
3919 | */ | |
3920 | ||
3921 | al = (struct as_external_lsa *)lsa->data; | |
3922 | p.family = AF_INET; | |
3923 | p.prefixlen = ip_masklen(al->mask); | |
3924 | p.prefix = lsa->data->id; | |
3925 | ||
3926 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
3927 | break; | |
3928 | ei = ospf_external_info_check(ospf, lsa); | |
3929 | if (ei) | |
3930 | new = ospf_external_lsa_refresh( | |
3931 | ospf, lsa, ei, LSA_REFRESH_FORCE, false); | |
3932 | else { | |
3933 | aggr = (struct ospf_external_aggr_rt *) | |
3934 | ospf_extrenal_aggregator_lookup(ospf, &p); | |
3935 | if (aggr) { | |
3936 | struct external_info ei_aggr; | |
3937 | ||
3938 | memset(&ei_aggr, 0, sizeof(ei_aggr)); | |
3939 | ei_aggr.p = aggr->p; | |
3940 | ei_aggr.tag = aggr->tag; | |
3941 | ei_aggr.instance = ospf->instance; | |
3942 | ei_aggr.route_map_set.metric = -1; | |
3943 | ei_aggr.route_map_set.metric_type = -1; | |
3944 | ||
3945 | ospf_external_lsa_refresh(ospf, lsa, &ei_aggr, | |
3946 | LSA_REFRESH_FORCE, true); | |
3947 | SET_FLAG(aggr->flags, | |
3948 | OSPF_EXTERNAL_AGGRT_ORIGINATED); | |
3949 | } else | |
3950 | ospf_lsa_flush_as(ospf, lsa); | |
3951 | } | |
3952 | break; | |
3953 | case OSPF_OPAQUE_LINK_LSA: | |
3954 | case OSPF_OPAQUE_AREA_LSA: | |
3955 | case OSPF_OPAQUE_AS_LSA: | |
3956 | new = ospf_opaque_lsa_refresh(lsa); | |
3957 | break; | |
3958 | default: | |
3959 | break; | |
3960 | } | |
3961 | return new; | |
3962 | } | |
3963 | ||
3964 | void ospf_refresher_register_lsa(struct ospf *ospf, struct ospf_lsa *lsa) | |
3965 | { | |
3966 | uint16_t index, current_index; | |
3967 | ||
3968 | assert(lsa->lock > 0); | |
3969 | assert(IS_LSA_SELF(lsa)); | |
3970 | ||
3971 | if (lsa->refresh_list < 0) { | |
3972 | int delay; | |
3973 | int min_delay = | |
3974 | ospf->lsa_refresh_timer - (2 * OSPF_LS_REFRESH_JITTER); | |
3975 | int max_delay = | |
3976 | ospf->lsa_refresh_timer - OSPF_LS_REFRESH_JITTER; | |
3977 | ||
3978 | /* We want to refresh the LSA within OSPF_LS_REFRESH_TIME which | |
3979 | * is | |
3980 | * 1800s. Use jitter so that we send the LSA sometime between | |
3981 | * 1680s | |
3982 | * and 1740s. | |
3983 | */ | |
3984 | delay = (frr_weak_random() % (max_delay - min_delay)) | |
3985 | + min_delay; | |
3986 | ||
3987 | current_index = ospf->lsa_refresh_queue.index | |
3988 | + (monotime(NULL) - ospf->lsa_refresher_started) | |
3989 | / OSPF_LSA_REFRESHER_GRANULARITY; | |
3990 | ||
3991 | index = (current_index + delay / OSPF_LSA_REFRESHER_GRANULARITY) | |
3992 | % (OSPF_LSA_REFRESHER_SLOTS); | |
3993 | ||
3994 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
3995 | zlog_debug( | |
3996 | "LSA[Refresh:Type%d:%pI4]: age %d, added to index %d", | |
3997 | lsa->data->type, &lsa->data->id, | |
3998 | LS_AGE(lsa), index); | |
3999 | ||
4000 | if (!ospf->lsa_refresh_queue.qs[index]) | |
4001 | ospf->lsa_refresh_queue.qs[index] = list_new(); | |
4002 | ||
4003 | listnode_add(ospf->lsa_refresh_queue.qs[index], | |
4004 | ospf_lsa_lock(lsa)); /* lsa_refresh_queue */ | |
4005 | lsa->refresh_list = index; | |
4006 | ||
4007 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4008 | zlog_debug( | |
4009 | "LSA[Refresh:Type%d:%pI4]: %s: setting refresh_list on lsa %p (slot %d)", | |
4010 | lsa->data->type, &lsa->data->id, __func__, | |
4011 | (void *)lsa, index); | |
4012 | } | |
4013 | } | |
4014 | ||
4015 | void ospf_refresher_unregister_lsa(struct ospf *ospf, struct ospf_lsa *lsa) | |
4016 | { | |
4017 | assert(lsa->lock > 0); | |
4018 | assert(IS_LSA_SELF(lsa)); | |
4019 | if (lsa->refresh_list >= 0) { | |
4020 | struct list *refresh_list = | |
4021 | ospf->lsa_refresh_queue.qs[lsa->refresh_list]; | |
4022 | listnode_delete(refresh_list, lsa); | |
4023 | if (!listcount(refresh_list)) { | |
4024 | list_delete(&refresh_list); | |
4025 | ospf->lsa_refresh_queue.qs[lsa->refresh_list] = NULL; | |
4026 | } | |
4027 | lsa->refresh_list = -1; | |
4028 | ospf_lsa_unlock(&lsa); /* lsa_refresh_queue */ | |
4029 | } | |
4030 | } | |
4031 | ||
4032 | void ospf_lsa_refresh_walker(struct event *t) | |
4033 | { | |
4034 | struct list *refresh_list; | |
4035 | struct listnode *node, *nnode; | |
4036 | struct ospf *ospf = EVENT_ARG(t); | |
4037 | struct ospf_lsa *lsa; | |
4038 | int i; | |
4039 | struct list *lsa_to_refresh = list_new(); | |
4040 | bool dna_lsa; | |
4041 | ||
4042 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4043 | zlog_debug("LSA[Refresh]: %s: start", __func__); | |
4044 | ||
4045 | ||
4046 | i = ospf->lsa_refresh_queue.index; | |
4047 | ||
4048 | /* Note: if clock has jumped backwards, then time change could be | |
4049 | negative, | |
4050 | so we are careful to cast the expression to unsigned before taking | |
4051 | modulus. */ | |
4052 | ospf->lsa_refresh_queue.index = | |
4053 | ((unsigned long)(ospf->lsa_refresh_queue.index | |
4054 | + (monotime(NULL) | |
4055 | - ospf->lsa_refresher_started) | |
4056 | / OSPF_LSA_REFRESHER_GRANULARITY)) | |
4057 | % OSPF_LSA_REFRESHER_SLOTS; | |
4058 | ||
4059 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4060 | zlog_debug("LSA[Refresh]: %s: next index %d", __func__, | |
4061 | ospf->lsa_refresh_queue.index); | |
4062 | ||
4063 | for (; i != ospf->lsa_refresh_queue.index; | |
4064 | i = (i + 1) % OSPF_LSA_REFRESHER_SLOTS) { | |
4065 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4066 | zlog_debug("LSA[Refresh]: %s: refresh index %d", | |
4067 | __func__, i); | |
4068 | ||
4069 | refresh_list = ospf->lsa_refresh_queue.qs[i]; | |
4070 | ||
4071 | assert(i >= 0); | |
4072 | ||
4073 | ospf->lsa_refresh_queue.qs[i] = NULL; | |
4074 | ||
4075 | if (refresh_list) { | |
4076 | for (ALL_LIST_ELEMENTS(refresh_list, node, nnode, | |
4077 | lsa)) { | |
4078 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4079 | zlog_debug( | |
4080 | "LSA[Refresh:Type%d:%pI4]: %s: refresh lsa %p (slot %d)", | |
4081 | lsa->data->type, &lsa->data->id, | |
4082 | __func__, (void *)lsa, i); | |
4083 | ||
4084 | assert(lsa->lock > 0); | |
4085 | list_delete_node(refresh_list, node); | |
4086 | lsa->refresh_list = -1; | |
4087 | listnode_add(lsa_to_refresh, lsa); | |
4088 | } | |
4089 | list_delete(&refresh_list); | |
4090 | } | |
4091 | } | |
4092 | ||
4093 | ospf->t_lsa_refresher = NULL; | |
4094 | event_add_timer(master, ospf_lsa_refresh_walker, ospf, | |
4095 | ospf->lsa_refresh_interval, &ospf->t_lsa_refresher); | |
4096 | ospf->lsa_refresher_started = monotime(NULL); | |
4097 | ||
4098 | for (ALL_LIST_ELEMENTS(lsa_to_refresh, node, nnode, lsa)) { | |
4099 | dna_lsa = ospf_check_dna_lsa(lsa); | |
4100 | if (!dna_lsa) { /* refresh only non-DNA LSAs */ | |
4101 | ospf_lsa_refresh(ospf, lsa); | |
4102 | } | |
4103 | assert(lsa->lock > 0); | |
4104 | ospf_lsa_unlock(&lsa); /* lsa_refresh_queue & temp for | |
4105 | * lsa_to_refresh. | |
4106 | */ | |
4107 | } | |
4108 | ||
4109 | list_delete(&lsa_to_refresh); | |
4110 | ||
4111 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4112 | zlog_debug("LSA[Refresh]: %s: end", __func__); | |
4113 | } | |
4114 | ||
4115 | /* Flush the LSAs for the specific area */ | |
4116 | void ospf_flush_lsa_from_area(struct ospf *ospf, struct in_addr area_id, | |
4117 | int type) | |
4118 | { | |
4119 | struct ospf_area *area; | |
4120 | struct route_node *rn; | |
4121 | struct ospf_lsa *lsa; | |
4122 | ||
4123 | area = ospf_area_get(ospf, area_id); | |
4124 | ||
4125 | switch (type) { | |
4126 | case OSPF_AS_EXTERNAL_LSA: | |
4127 | if ((area->external_routing == OSPF_AREA_NSSA) || | |
4128 | (area->external_routing == OSPF_AREA_STUB)) { | |
4129 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) | |
4130 | if (IS_LSA_SELF(lsa) && | |
4131 | !(CHECK_FLAG(lsa->flags, | |
4132 | OSPF_LSA_LOCAL_XLT))) | |
4133 | ospf_lsa_flush_area(lsa, area); | |
4134 | } | |
4135 | break; | |
4136 | case OSPF_AS_NSSA_LSA: | |
4137 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) | |
4138 | if (IS_LSA_SELF(lsa)) | |
4139 | ospf_lsa_flush_area(lsa, area); | |
4140 | break; | |
4141 | default: | |
4142 | break; | |
4143 | } | |
4144 | } |