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1 | /* | |
2 | * OSPF Link State Advertisement | |
3 | * Copyright (C) 1999, 2000 Toshiaki Takada | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "monotime.h" | |
25 | #include "linklist.h" | |
26 | #include "prefix.h" | |
27 | #include "if.h" | |
28 | #include "table.h" | |
29 | #include "memory.h" | |
30 | #include "stream.h" | |
31 | #include "log.h" | |
32 | #include "thread.h" | |
33 | #include "hash.h" | |
34 | #include "sockunion.h" /* for inet_aton() */ | |
35 | #include "checksum.h" | |
36 | #include "network.h" | |
37 | ||
38 | #include "ospfd/ospfd.h" | |
39 | #include "ospfd/ospf_interface.h" | |
40 | #include "ospfd/ospf_ism.h" | |
41 | #include "ospfd/ospf_asbr.h" | |
42 | #include "ospfd/ospf_lsa.h" | |
43 | #include "ospfd/ospf_lsdb.h" | |
44 | #include "ospfd/ospf_neighbor.h" | |
45 | #include "ospfd/ospf_nsm.h" | |
46 | #include "ospfd/ospf_flood.h" | |
47 | #include "ospfd/ospf_packet.h" | |
48 | #include "ospfd/ospf_spf.h" | |
49 | #include "ospfd/ospf_dump.h" | |
50 | #include "ospfd/ospf_route.h" | |
51 | #include "ospfd/ospf_ase.h" | |
52 | #include "ospfd/ospf_zebra.h" | |
53 | #include "ospfd/ospf_abr.h" | |
54 | #include "ospfd/ospf_errors.h" | |
55 | #include "ospfd/ospf_te.h" | |
56 | #include "ospfd/ospf_orr.h" | |
57 | ||
58 | static struct ospf_lsa *ospf_handle_summarylsa_lsId_chg(struct ospf *ospf, | |
59 | struct prefix_ipv4 *p, | |
60 | uint8_t type, | |
61 | uint32_t metric, | |
62 | struct in_addr old_id); | |
63 | static struct ospf_lsa * | |
64 | ospf_summary_lsa_prepare_and_flood(struct prefix_ipv4 *p, uint32_t metric, | |
65 | struct ospf_area *area, struct in_addr id); | |
66 | static struct ospf_lsa *ospf_summary_lsa_refresh(struct ospf *ospf, | |
67 | struct ospf_lsa *lsa); | |
68 | static struct ospf_lsa * | |
69 | ospf_asbr_summary_lsa_prepare_and_flood(struct prefix_ipv4 *p, uint32_t metric, | |
70 | struct ospf_area *area, | |
71 | struct in_addr id); | |
72 | static struct ospf_lsa *ospf_summary_asbr_lsa_refresh(struct ospf *ospf, | |
73 | struct ospf_lsa *lsa); | |
74 | static struct ospf_lsa *ospf_handle_exnl_lsa_lsId_chg(struct ospf *ospf, | |
75 | struct external_info *ei, | |
76 | struct in_addr id); | |
77 | static struct ospf_lsa * | |
78 | ospf_exnl_lsa_prepare_and_flood(struct ospf *ospf, struct external_info *ei, | |
79 | struct in_addr id); | |
80 | ||
81 | uint32_t get_metric(uint8_t *metric) | |
82 | { | |
83 | uint32_t m; | |
84 | m = metric[0]; | |
85 | m = (m << 8) + metric[1]; | |
86 | m = (m << 8) + metric[2]; | |
87 | return m; | |
88 | } | |
89 | ||
90 | ||
91 | struct timeval int2tv(int a) | |
92 | { | |
93 | struct timeval ret; | |
94 | ||
95 | ret.tv_sec = a; | |
96 | ret.tv_usec = 0; | |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
101 | struct timeval msec2tv(int a) | |
102 | { | |
103 | struct timeval ret; | |
104 | ||
105 | ret.tv_sec = a / 1000; | |
106 | ret.tv_usec = (a % 1000) * 1000; | |
107 | ||
108 | return ret; | |
109 | } | |
110 | ||
111 | int ospf_lsa_refresh_delay(struct ospf_lsa *lsa) | |
112 | { | |
113 | struct timeval delta; | |
114 | int delay = 0; | |
115 | ||
116 | if (monotime_since(&lsa->tv_orig, &delta) | |
117 | < OSPF_MIN_LS_INTERVAL * 1000LL) { | |
118 | struct timeval minv = msec2tv(OSPF_MIN_LS_INTERVAL); | |
119 | timersub(&minv, &delta, &minv); | |
120 | ||
121 | /* TBD: remove padding to full sec, return timeval instead */ | |
122 | delay = minv.tv_sec + !!minv.tv_usec; | |
123 | ||
124 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
125 | zlog_debug( | |
126 | "LSA[Type%d:%pI4]: Refresh timer delay %d seconds", | |
127 | lsa->data->type, &lsa->data->id, | |
128 | delay); | |
129 | ||
130 | assert(delay > 0); | |
131 | } | |
132 | ||
133 | return delay; | |
134 | } | |
135 | ||
136 | ||
137 | int get_age(struct ospf_lsa *lsa) | |
138 | { | |
139 | struct timeval rel; | |
140 | ||
141 | monotime_since(&lsa->tv_recv, &rel); | |
142 | return ntohs(lsa->data->ls_age) + rel.tv_sec; | |
143 | } | |
144 | ||
145 | ||
146 | /* Fletcher Checksum -- Refer to RFC1008. */ | |
147 | ||
148 | /* All the offsets are zero-based. The offsets in the RFC1008 are | |
149 | one-based. */ | |
150 | uint16_t ospf_lsa_checksum(struct lsa_header *lsa) | |
151 | { | |
152 | uint8_t *buffer = &lsa->options; | |
153 | int options_offset = buffer - (uint8_t *)&lsa->ls_age; /* should be 2 */ | |
154 | ||
155 | /* Skip the AGE field */ | |
156 | uint16_t len = ntohs(lsa->length) - options_offset; | |
157 | ||
158 | /* Checksum offset starts from "options" field, not the beginning of the | |
159 | lsa_header struct. The offset is 14, rather than 16. */ | |
160 | int checksum_offset = (uint8_t *)&lsa->checksum - buffer; | |
161 | ||
162 | return fletcher_checksum(buffer, len, checksum_offset); | |
163 | } | |
164 | ||
165 | int ospf_lsa_checksum_valid(struct lsa_header *lsa) | |
166 | { | |
167 | uint8_t *buffer = &lsa->options; | |
168 | int options_offset = buffer - (uint8_t *)&lsa->ls_age; /* should be 2 */ | |
169 | ||
170 | /* Skip the AGE field */ | |
171 | uint16_t len = ntohs(lsa->length) - options_offset; | |
172 | ||
173 | return (fletcher_checksum(buffer, len, FLETCHER_CHECKSUM_VALIDATE) | |
174 | == 0); | |
175 | } | |
176 | ||
177 | ||
178 | /* Create OSPF LSA. */ | |
179 | struct ospf_lsa *ospf_lsa_new(void) | |
180 | { | |
181 | struct ospf_lsa *new; | |
182 | ||
183 | new = XCALLOC(MTYPE_OSPF_LSA, sizeof(struct ospf_lsa)); | |
184 | ||
185 | new->flags = 0; | |
186 | new->lock = 1; | |
187 | new->retransmit_counter = 0; | |
188 | monotime(&new->tv_recv); | |
189 | new->tv_orig = new->tv_recv; | |
190 | new->refresh_list = -1; | |
191 | new->vrf_id = VRF_DEFAULT; | |
192 | new->to_be_acknowledged = 0; | |
193 | new->opaque_zero_len_delete = 0; | |
194 | ||
195 | return new; | |
196 | } | |
197 | ||
198 | struct ospf_lsa *ospf_lsa_new_and_data(size_t size) | |
199 | { | |
200 | struct ospf_lsa *new; | |
201 | ||
202 | new = ospf_lsa_new(); | |
203 | new->data = ospf_lsa_data_new(size); | |
204 | new->size = size; | |
205 | ||
206 | return new; | |
207 | } | |
208 | ||
209 | /* Duplicate OSPF LSA. */ | |
210 | struct ospf_lsa *ospf_lsa_dup(struct ospf_lsa *lsa) | |
211 | { | |
212 | struct ospf_lsa *new; | |
213 | ||
214 | if (lsa == NULL) | |
215 | return NULL; | |
216 | ||
217 | new = XCALLOC(MTYPE_OSPF_LSA, sizeof(struct ospf_lsa)); | |
218 | ||
219 | memcpy(new, lsa, sizeof(struct ospf_lsa)); | |
220 | UNSET_FLAG(new->flags, OSPF_LSA_DISCARD); | |
221 | new->lock = 1; | |
222 | new->retransmit_counter = 0; | |
223 | new->data = ospf_lsa_data_dup(lsa->data); | |
224 | ||
225 | /* kevinm: Clear the refresh_list, otherwise there are going | |
226 | to be problems when we try to remove the LSA from the | |
227 | queue (which it's not a member of.) | |
228 | XXX: Should we add the LSA to the refresh_list queue? */ | |
229 | new->refresh_list = -1; | |
230 | ||
231 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
232 | zlog_debug("LSA: duplicated %p (new: %p)", (void *)lsa, | |
233 | (void *)new); | |
234 | ||
235 | return new; | |
236 | } | |
237 | ||
238 | /* Free OSPF LSA. */ | |
239 | void ospf_lsa_free(struct ospf_lsa *lsa) | |
240 | { | |
241 | assert(lsa->lock == 0); | |
242 | ||
243 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
244 | zlog_debug("LSA: freed %p", (void *)lsa); | |
245 | ||
246 | /* Delete LSA data. */ | |
247 | if (lsa->data != NULL) | |
248 | ospf_lsa_data_free(lsa->data); | |
249 | ||
250 | assert(lsa->refresh_list < 0); | |
251 | ||
252 | memset(lsa, 0, sizeof(struct ospf_lsa)); | |
253 | XFREE(MTYPE_OSPF_LSA, lsa); | |
254 | } | |
255 | ||
256 | /* Lock LSA. */ | |
257 | struct ospf_lsa *ospf_lsa_lock(struct ospf_lsa *lsa) | |
258 | { | |
259 | lsa->lock++; | |
260 | return lsa; | |
261 | } | |
262 | ||
263 | /* Unlock LSA. */ | |
264 | void ospf_lsa_unlock(struct ospf_lsa **lsa) | |
265 | { | |
266 | /* This is sanity check. */ | |
267 | if (!lsa || !*lsa) | |
268 | return; | |
269 | ||
270 | (*lsa)->lock--; | |
271 | ||
272 | assert((*lsa)->lock >= 0); | |
273 | ||
274 | if ((*lsa)->lock == 0) { | |
275 | assert(CHECK_FLAG((*lsa)->flags, OSPF_LSA_DISCARD)); | |
276 | ospf_lsa_free(*lsa); | |
277 | *lsa = NULL; | |
278 | } | |
279 | } | |
280 | ||
281 | /* Check discard flag. */ | |
282 | void ospf_lsa_discard(struct ospf_lsa *lsa) | |
283 | { | |
284 | if (!CHECK_FLAG(lsa->flags, OSPF_LSA_DISCARD)) { | |
285 | SET_FLAG(lsa->flags, OSPF_LSA_DISCARD); | |
286 | ospf_lsa_unlock(&lsa); | |
287 | } | |
288 | } | |
289 | ||
290 | /* Create LSA data. */ | |
291 | struct lsa_header *ospf_lsa_data_new(size_t size) | |
292 | { | |
293 | return XCALLOC(MTYPE_OSPF_LSA_DATA, size); | |
294 | } | |
295 | ||
296 | /* Duplicate LSA data. */ | |
297 | struct lsa_header *ospf_lsa_data_dup(struct lsa_header *lsah) | |
298 | { | |
299 | struct lsa_header *new; | |
300 | ||
301 | new = ospf_lsa_data_new(ntohs(lsah->length)); | |
302 | memcpy(new, lsah, ntohs(lsah->length)); | |
303 | ||
304 | return new; | |
305 | } | |
306 | ||
307 | /* Free LSA data. */ | |
308 | void ospf_lsa_data_free(struct lsa_header *lsah) | |
309 | { | |
310 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
311 | zlog_debug("LSA[Type%d:%pI4]: data freed %p", lsah->type, | |
312 | &lsah->id, (void *)lsah); | |
313 | ||
314 | XFREE(MTYPE_OSPF_LSA_DATA, lsah); | |
315 | } | |
316 | ||
317 | ||
318 | /* LSA general functions. */ | |
319 | ||
320 | const char *dump_lsa_key(struct ospf_lsa *lsa) | |
321 | { | |
322 | static char buf[sizeof("Type255,id(255.255.255.255),ar(255.255.255.255)")+1]; | |
323 | struct lsa_header *lsah; | |
324 | ||
325 | if (lsa != NULL && (lsah = lsa->data) != NULL) { | |
326 | char id[INET_ADDRSTRLEN], ar[INET_ADDRSTRLEN]; | |
327 | inet_ntop(AF_INET, &lsah->id, id, sizeof(id)); | |
328 | inet_ntop(AF_INET, &lsah->adv_router, ar, sizeof(ar)); | |
329 | ||
330 | snprintf(buf, sizeof(buf), "Type%d,id(%s),ar(%s)", lsah->type, | |
331 | id, ar); | |
332 | } else | |
333 | strlcpy(buf, "NULL", sizeof(buf)); | |
334 | ||
335 | return buf; | |
336 | } | |
337 | ||
338 | uint32_t lsa_seqnum_increment(struct ospf_lsa *lsa) | |
339 | { | |
340 | uint32_t seqnum; | |
341 | ||
342 | seqnum = ntohl(lsa->data->ls_seqnum) + 1; | |
343 | ||
344 | return htonl(seqnum); | |
345 | } | |
346 | ||
347 | void lsa_header_set(struct stream *s, uint8_t options, uint8_t type, | |
348 | struct in_addr id, struct in_addr router_id) | |
349 | { | |
350 | struct lsa_header *lsah; | |
351 | ||
352 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
353 | ||
354 | lsah->ls_age = htons(OSPF_LSA_INITIAL_AGE); | |
355 | lsah->options = options; | |
356 | lsah->type = type; | |
357 | lsah->id = id; | |
358 | lsah->adv_router = router_id; | |
359 | lsah->ls_seqnum = htonl(OSPF_INITIAL_SEQUENCE_NUMBER); | |
360 | ||
361 | stream_forward_endp(s, OSPF_LSA_HEADER_SIZE); | |
362 | } | |
363 | ||
364 | ||
365 | /* router-LSA related functions. */ | |
366 | /* Get router-LSA flags. */ | |
367 | uint8_t router_lsa_flags(struct ospf_area *area) | |
368 | { | |
369 | uint8_t flags; | |
370 | ||
371 | flags = area->ospf->flags; | |
372 | ||
373 | /* Set virtual link flag. */ | |
374 | if (ospf_full_virtual_nbrs(area)) | |
375 | SET_FLAG(flags, ROUTER_LSA_VIRTUAL); | |
376 | else | |
377 | /* Just sanity check */ | |
378 | UNSET_FLAG(flags, ROUTER_LSA_VIRTUAL); | |
379 | ||
380 | /* Set Shortcut ABR behabiour flag. */ | |
381 | UNSET_FLAG(flags, ROUTER_LSA_SHORTCUT); | |
382 | if (area->ospf->abr_type == OSPF_ABR_SHORTCUT) | |
383 | if (!OSPF_IS_AREA_BACKBONE(area)) | |
384 | if ((area->shortcut_configured == OSPF_SHORTCUT_DEFAULT | |
385 | && area->ospf->backbone == NULL) | |
386 | || area->shortcut_configured | |
387 | == OSPF_SHORTCUT_ENABLE) | |
388 | SET_FLAG(flags, ROUTER_LSA_SHORTCUT); | |
389 | ||
390 | /* ASBR can't exit in stub area. */ | |
391 | if (area->external_routing == OSPF_AREA_STUB) | |
392 | UNSET_FLAG(flags, ROUTER_LSA_EXTERNAL); | |
393 | /* If ASBR set External flag */ | |
394 | else if (IS_OSPF_ASBR(area->ospf)) | |
395 | SET_FLAG(flags, ROUTER_LSA_EXTERNAL); | |
396 | ||
397 | /* Set ABR dependent flags */ | |
398 | if (IS_OSPF_ABR(area->ospf)) { | |
399 | SET_FLAG(flags, ROUTER_LSA_BORDER); | |
400 | /* If Area is NSSA and we are both ABR and unconditional | |
401 | * translator, | |
402 | * set Nt bit to inform other routers. | |
403 | */ | |
404 | if ((area->external_routing == OSPF_AREA_NSSA) | |
405 | && (area->NSSATranslatorRole == OSPF_NSSA_ROLE_ALWAYS)) | |
406 | SET_FLAG(flags, ROUTER_LSA_NT); | |
407 | } | |
408 | return flags; | |
409 | } | |
410 | ||
411 | /* Lookup neighbor other than myself. | |
412 | And check neighbor count, | |
413 | Point-to-Point link must have only 1 neighbor. */ | |
414 | struct ospf_neighbor *ospf_nbr_lookup_ptop(struct ospf_interface *oi) | |
415 | { | |
416 | struct ospf_neighbor *nbr = NULL; | |
417 | struct route_node *rn; | |
418 | ||
419 | /* Search neighbor, there must be one of two nbrs. */ | |
420 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
421 | if ((nbr = rn->info)) | |
422 | if (!IPV4_ADDR_SAME(&nbr->router_id, | |
423 | &oi->ospf->router_id)) | |
424 | if (nbr->state == NSM_Full) { | |
425 | route_unlock_node(rn); | |
426 | break; | |
427 | } | |
428 | ||
429 | /* PtoP link must have only 1 neighbor. */ | |
430 | if (ospf_nbr_count(oi, 0) > 1) | |
431 | flog_warn( | |
432 | EC_OSPF_PTP_NEIGHBOR, | |
433 | "Point-to-Point link on interface %s has more than 1 neighbor.", | |
434 | oi->ifp->name); | |
435 | ||
436 | return nbr; | |
437 | } | |
438 | ||
439 | /* Determine cost of link, taking RFC3137 stub-router support into | |
440 | * consideration | |
441 | */ | |
442 | static uint16_t ospf_link_cost(struct ospf_interface *oi) | |
443 | { | |
444 | /* RFC3137 stub router support */ | |
445 | if (!CHECK_FLAG(oi->area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED)) | |
446 | return oi->output_cost; | |
447 | else | |
448 | return OSPF_OUTPUT_COST_INFINITE; | |
449 | } | |
450 | ||
451 | /* Set a link information. */ | |
452 | char link_info_set(struct stream **s, struct in_addr id, struct in_addr data, | |
453 | uint8_t type, uint8_t tos, uint16_t cost) | |
454 | { | |
455 | /* LSA stream is initially allocated to OSPF_MAX_LSA_SIZE, suits | |
456 | * vast majority of cases. Some rare routers with lots of links need | |
457 | * more. | |
458 | * we try accommodate those here. | |
459 | */ | |
460 | if (STREAM_WRITEABLE(*s) < OSPF_ROUTER_LSA_LINK_SIZE) { | |
461 | size_t ret = OSPF_MAX_LSA_SIZE; | |
462 | ||
463 | /* Can we enlarge the stream still? */ | |
464 | if (STREAM_SIZE(*s) == OSPF_MAX_LSA_SIZE) { | |
465 | /* we futz the size here for simplicity, really we need | |
466 | * to account | |
467 | * for just: | |
468 | * IP Header - (sizeof(struct ip)) | |
469 | * OSPF Header - OSPF_HEADER_SIZE | |
470 | * LSA Header - OSPF_LSA_HEADER_SIZE | |
471 | * MD5 auth data, if MD5 is configured - | |
472 | * OSPF_AUTH_MD5_SIZE. | |
473 | * | |
474 | * Simpler just to subtract OSPF_MAX_LSA_SIZE though. | |
475 | */ | |
476 | ret = stream_resize_inplace( | |
477 | s, OSPF_MAX_PACKET_SIZE - OSPF_MAX_LSA_SIZE); | |
478 | } | |
479 | ||
480 | if (ret == OSPF_MAX_LSA_SIZE) { | |
481 | flog_warn( | |
482 | EC_OSPF_LSA_SIZE, | |
483 | "%s: Out of space in LSA stream, left %zd, size %zd", | |
484 | __func__, STREAM_WRITEABLE(*s), | |
485 | STREAM_SIZE(*s)); | |
486 | return 0; | |
487 | } | |
488 | } | |
489 | ||
490 | /* TOS based routing is not supported. */ | |
491 | stream_put_ipv4(*s, id.s_addr); /* Link ID. */ | |
492 | stream_put_ipv4(*s, data.s_addr); /* Link Data. */ | |
493 | stream_putc(*s, type); /* Link Type. */ | |
494 | stream_putc(*s, tos); /* TOS = 0. */ | |
495 | stream_putw(*s, cost); /* Link Cost. */ | |
496 | ||
497 | return 1; | |
498 | } | |
499 | ||
500 | /* Describe Point-to-Point link (Section 12.4.1.1). */ | |
501 | ||
502 | /* Note: If the interface is configured as point-to-point dmvpn then the other | |
503 | * end of link is dmvpn hub with point-to-multipoint ospf network type. The | |
504 | * hub then expects this router to populate the stub network and also Link Data | |
505 | * Field set to IP Address and not MIB-II ifIndex | |
506 | */ | |
507 | static int lsa_link_ptop_set(struct stream **s, struct ospf_interface *oi) | |
508 | { | |
509 | int links = 0; | |
510 | struct ospf_neighbor *nbr; | |
511 | struct in_addr id, mask, data; | |
512 | uint16_t cost = ospf_link_cost(oi); | |
513 | ||
514 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
515 | zlog_debug("LSA[Type1]: Set link Point-to-Point"); | |
516 | ||
517 | if ((nbr = ospf_nbr_lookup_ptop(oi))) | |
518 | if (nbr->state == NSM_Full) { | |
519 | if (CHECK_FLAG(oi->connected->flags, | |
520 | ZEBRA_IFA_UNNUMBERED) | |
521 | && !oi->ptp_dmvpn) { | |
522 | /* For unnumbered point-to-point networks, the | |
523 | Link Data field | |
524 | should specify the interface's MIB-II ifIndex | |
525 | value. */ | |
526 | data.s_addr = htonl(oi->ifp->ifindex); | |
527 | links += link_info_set( | |
528 | s, nbr->router_id, data, | |
529 | LSA_LINK_TYPE_POINTOPOINT, 0, cost); | |
530 | } else { | |
531 | links += link_info_set( | |
532 | s, nbr->router_id, | |
533 | oi->address->u.prefix4, | |
534 | LSA_LINK_TYPE_POINTOPOINT, 0, cost); | |
535 | } | |
536 | } | |
537 | ||
538 | /* no need for a stub link for unnumbered interfaces */ | |
539 | if (oi->ptp_dmvpn | |
540 | || !CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED)) { | |
541 | /* Regardless of the state of the neighboring router, we must | |
542 | add a Type 3 link (stub network). | |
543 | N.B. Options 1 & 2 share basically the same logic. */ | |
544 | masklen2ip(oi->address->prefixlen, &mask); | |
545 | id.s_addr = CONNECTED_PREFIX(oi->connected)->u.prefix4.s_addr | |
546 | & mask.s_addr; | |
547 | links += link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, | |
548 | oi->output_cost); | |
549 | } | |
550 | ||
551 | return links; | |
552 | } | |
553 | ||
554 | /* Describe Broadcast Link. */ | |
555 | static int lsa_link_broadcast_set(struct stream **s, struct ospf_interface *oi) | |
556 | { | |
557 | struct ospf_neighbor *dr; | |
558 | struct in_addr id, mask; | |
559 | uint16_t cost = ospf_link_cost(oi); | |
560 | ||
561 | /* Describe Type 3 Link. */ | |
562 | if (oi->state == ISM_Waiting) { | |
563 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
564 | zlog_debug( | |
565 | "LSA[Type1]: Interface %s is in state Waiting. Adding stub interface", | |
566 | oi->ifp->name); | |
567 | masklen2ip(oi->address->prefixlen, &mask); | |
568 | id.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
569 | return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, | |
570 | oi->output_cost); | |
571 | } | |
572 | ||
573 | dr = ospf_nbr_lookup_by_addr(oi->nbrs, &DR(oi)); | |
574 | /* Describe Type 2 link. */ | |
575 | if (dr && (dr->state == NSM_Full | |
576 | || IPV4_ADDR_SAME(&oi->address->u.prefix4, &DR(oi))) | |
577 | && ospf_nbr_count(oi, NSM_Full) > 0) { | |
578 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
579 | zlog_debug( | |
580 | "LSA[Type1]: Interface %s has a DR. Adding transit interface", | |
581 | oi->ifp->name); | |
582 | return link_info_set(s, DR(oi), oi->address->u.prefix4, | |
583 | LSA_LINK_TYPE_TRANSIT, 0, cost); | |
584 | } | |
585 | /* Describe type 3 link. */ | |
586 | else { | |
587 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
588 | zlog_debug( | |
589 | "LSA[Type1]: Interface %s has no DR. Adding stub interface", | |
590 | oi->ifp->name); | |
591 | masklen2ip(oi->address->prefixlen, &mask); | |
592 | id.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
593 | return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, | |
594 | oi->output_cost); | |
595 | } | |
596 | } | |
597 | ||
598 | static int lsa_link_loopback_set(struct stream **s, struct ospf_interface *oi) | |
599 | { | |
600 | struct in_addr id, mask; | |
601 | ||
602 | /* Describe Type 3 Link. */ | |
603 | if (oi->state != ISM_Loopback) | |
604 | return 0; | |
605 | ||
606 | mask.s_addr = 0xffffffff; | |
607 | id.s_addr = oi->address->u.prefix4.s_addr; | |
608 | return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, 0); | |
609 | } | |
610 | ||
611 | /* Describe Virtual Link. */ | |
612 | static int lsa_link_virtuallink_set(struct stream **s, | |
613 | struct ospf_interface *oi) | |
614 | { | |
615 | struct ospf_neighbor *nbr; | |
616 | uint16_t cost = ospf_link_cost(oi); | |
617 | ||
618 | if (oi->state == ISM_PointToPoint) | |
619 | if ((nbr = ospf_nbr_lookup_ptop(oi))) | |
620 | if (nbr->state == NSM_Full) { | |
621 | return link_info_set(s, nbr->router_id, | |
622 | oi->address->u.prefix4, | |
623 | LSA_LINK_TYPE_VIRTUALLINK, | |
624 | 0, cost); | |
625 | } | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
630 | #define lsa_link_nbma_set(S,O) lsa_link_broadcast_set (S, O) | |
631 | ||
632 | /* this function add for support point-to-multipoint ,see rfc2328 | |
633 | 12.4.1.4.*/ | |
634 | /* from "edward rrr" <edward_rrr@hotmail.com> | |
635 | http://marc.theaimsgroup.com/?l=zebra&m=100739222210507&w=2 */ | |
636 | static int lsa_link_ptomp_set(struct stream **s, struct ospf_interface *oi) | |
637 | { | |
638 | int links = 0; | |
639 | struct route_node *rn; | |
640 | struct ospf_neighbor *nbr = NULL; | |
641 | struct in_addr id, mask; | |
642 | uint16_t cost = ospf_link_cost(oi); | |
643 | ||
644 | mask.s_addr = 0xffffffff; | |
645 | id.s_addr = oi->address->u.prefix4.s_addr; | |
646 | links += link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, 0); | |
647 | ||
648 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
649 | zlog_debug("PointToMultipoint: running ptomultip_set"); | |
650 | ||
651 | /* Search neighbor, */ | |
652 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
653 | if ((nbr = rn->info) != NULL) | |
654 | /* Ignore myself. */ | |
655 | if (!IPV4_ADDR_SAME(&nbr->router_id, | |
656 | &oi->ospf->router_id)) | |
657 | if (nbr->state == NSM_Full) | |
658 | ||
659 | { | |
660 | links += link_info_set( | |
661 | s, nbr->router_id, | |
662 | oi->address->u.prefix4, | |
663 | LSA_LINK_TYPE_POINTOPOINT, 0, | |
664 | cost); | |
665 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
666 | zlog_debug( | |
667 | "PointToMultipoint: set link to %pI4", | |
668 | &oi->address->u.prefix4); | |
669 | } | |
670 | ||
671 | return links; | |
672 | } | |
673 | ||
674 | /* Set router-LSA link information. */ | |
675 | static int router_lsa_link_set(struct stream **s, struct ospf_area *area) | |
676 | { | |
677 | struct listnode *node; | |
678 | struct ospf_interface *oi; | |
679 | int links = 0; | |
680 | ||
681 | for (ALL_LIST_ELEMENTS_RO(area->oiflist, node, oi)) { | |
682 | struct interface *ifp = oi->ifp; | |
683 | ||
684 | /* Check interface is up, OSPF is enable. */ | |
685 | if (if_is_operative(ifp)) { | |
686 | if (oi->state != ISM_Down) { | |
687 | oi->lsa_pos_beg = links; | |
688 | /* Describe each link. */ | |
689 | switch (oi->type) { | |
690 | case OSPF_IFTYPE_POINTOPOINT: | |
691 | links += lsa_link_ptop_set(s, oi); | |
692 | break; | |
693 | case OSPF_IFTYPE_BROADCAST: | |
694 | links += lsa_link_broadcast_set(s, oi); | |
695 | break; | |
696 | case OSPF_IFTYPE_NBMA: | |
697 | links += lsa_link_nbma_set(s, oi); | |
698 | break; | |
699 | case OSPF_IFTYPE_POINTOMULTIPOINT: | |
700 | links += lsa_link_ptomp_set(s, oi); | |
701 | break; | |
702 | case OSPF_IFTYPE_VIRTUALLINK: | |
703 | links += | |
704 | lsa_link_virtuallink_set(s, oi); | |
705 | break; | |
706 | case OSPF_IFTYPE_LOOPBACK: | |
707 | links += lsa_link_loopback_set(s, oi); | |
708 | } | |
709 | oi->lsa_pos_end = links; | |
710 | } | |
711 | } | |
712 | } | |
713 | ||
714 | return links; | |
715 | } | |
716 | ||
717 | /* Set router-LSA body. */ | |
718 | void ospf_router_lsa_body_set(struct stream **s, struct ospf_area *area) | |
719 | { | |
720 | unsigned long putp; | |
721 | uint16_t cnt; | |
722 | ||
723 | /* Set flags. */ | |
724 | stream_putc(*s, router_lsa_flags(area)); | |
725 | ||
726 | /* Set Zero fields. */ | |
727 | stream_putc(*s, 0); | |
728 | ||
729 | /* Keep pointer to # links. */ | |
730 | putp = stream_get_endp(*s); | |
731 | ||
732 | /* Forward word */ | |
733 | stream_putw(*s, 0); | |
734 | ||
735 | /* Set all link information. */ | |
736 | cnt = router_lsa_link_set(s, area); | |
737 | ||
738 | /* Set # of links here. */ | |
739 | stream_putw_at(*s, putp, cnt); | |
740 | } | |
741 | ||
742 | static void ospf_stub_router_timer(struct thread *t) | |
743 | { | |
744 | struct ospf_area *area = THREAD_ARG(t); | |
745 | ||
746 | area->t_stub_router = NULL; | |
747 | ||
748 | SET_FLAG(area->stub_router_state, OSPF_AREA_WAS_START_STUB_ROUTED); | |
749 | ||
750 | /* clear stub route state and generate router-lsa refresh, don't | |
751 | * clobber an administratively set stub-router state though. | |
752 | */ | |
753 | if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_ADMIN_STUB_ROUTED)) | |
754 | return; | |
755 | ||
756 | UNSET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED); | |
757 | ||
758 | ospf_router_lsa_update_area(area); | |
759 | } | |
760 | ||
761 | static void ospf_stub_router_check(struct ospf_area *area) | |
762 | { | |
763 | /* area must either be administratively configured to be stub | |
764 | * or startup-time stub-router must be configured and we must in a | |
765 | * pre-stub | |
766 | * state. | |
767 | */ | |
768 | if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_ADMIN_STUB_ROUTED)) { | |
769 | SET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED); | |
770 | return; | |
771 | } | |
772 | ||
773 | /* not admin-stubbed, check whether startup stubbing is configured and | |
774 | * whether it's not been done yet | |
775 | */ | |
776 | if (CHECK_FLAG(area->stub_router_state, | |
777 | OSPF_AREA_WAS_START_STUB_ROUTED)) | |
778 | return; | |
779 | ||
780 | if (area->ospf->stub_router_startup_time | |
781 | == OSPF_STUB_ROUTER_UNCONFIGURED) { | |
782 | /* stub-router is hence done forever for this area, even if | |
783 | * someone | |
784 | * tries configure it (take effect next restart). | |
785 | */ | |
786 | SET_FLAG(area->stub_router_state, | |
787 | OSPF_AREA_WAS_START_STUB_ROUTED); | |
788 | return; | |
789 | } | |
790 | ||
791 | /* startup stub-router configured and not yet done */ | |
792 | SET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED); | |
793 | ||
794 | OSPF_AREA_TIMER_ON(area->t_stub_router, ospf_stub_router_timer, | |
795 | area->ospf->stub_router_startup_time); | |
796 | } | |
797 | ||
798 | /* Create new router-LSA. */ | |
799 | static struct ospf_lsa *ospf_router_lsa_new(struct ospf_area *area) | |
800 | { | |
801 | struct ospf *ospf = area->ospf; | |
802 | struct stream *s; | |
803 | struct lsa_header *lsah; | |
804 | struct ospf_lsa *new; | |
805 | int length; | |
806 | ||
807 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
808 | zlog_debug("LSA[Type1]: Create router-LSA instance"); | |
809 | ||
810 | /* check whether stub-router is desired, and if this is the first | |
811 | * router LSA. | |
812 | */ | |
813 | ospf_stub_router_check(area); | |
814 | ||
815 | /* Create a stream for LSA. */ | |
816 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
817 | /* Set LSA common header fields. */ | |
818 | lsa_header_set(s, LSA_OPTIONS_GET(area) | LSA_OPTIONS_NSSA_GET(area), | |
819 | OSPF_ROUTER_LSA, ospf->router_id, ospf->router_id); | |
820 | ||
821 | /* Set router-LSA body fields. */ | |
822 | ospf_router_lsa_body_set(&s, area); | |
823 | ||
824 | /* Set length. */ | |
825 | length = stream_get_endp(s); | |
826 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
827 | lsah->length = htons(length); | |
828 | ||
829 | /* Now, create OSPF LSA instance. */ | |
830 | new = ospf_lsa_new_and_data(length); | |
831 | ||
832 | new->area = area; | |
833 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
834 | new->vrf_id = area->ospf->vrf_id; | |
835 | ||
836 | /* Copy LSA data to store, discard stream. */ | |
837 | memcpy(new->data, lsah, length); | |
838 | stream_free(s); | |
839 | ||
840 | return new; | |
841 | } | |
842 | ||
843 | /* Originate Router-LSA. */ | |
844 | static struct ospf_lsa *ospf_router_lsa_originate(struct ospf_area *area) | |
845 | { | |
846 | struct ospf_lsa *new; | |
847 | ||
848 | if (area->ospf->gr_info.restart_in_progress) { | |
849 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
850 | zlog_debug( | |
851 | "LSA[Type%d]: Graceful Restart in progress, don't originate", | |
852 | OSPF_ROUTER_LSA); | |
853 | return NULL; | |
854 | } | |
855 | ||
856 | /* Create new router-LSA instance. */ | |
857 | if ((new = ospf_router_lsa_new(area)) == NULL) { | |
858 | zlog_err("%s: ospf_router_lsa_new returned NULL", __func__); | |
859 | return NULL; | |
860 | } | |
861 | ||
862 | /* Sanity check. */ | |
863 | if (new->data->adv_router.s_addr == INADDR_ANY) { | |
864 | if (IS_DEBUG_OSPF_EVENT) | |
865 | zlog_debug("LSA[Type1]: AdvRouter is 0, discard"); | |
866 | ospf_lsa_discard(new); | |
867 | return NULL; | |
868 | } | |
869 | ||
870 | /* Install LSA to LSDB. */ | |
871 | new = ospf_lsa_install(area->ospf, NULL, new); | |
872 | ||
873 | /* Update LSA origination count. */ | |
874 | area->ospf->lsa_originate_count++; | |
875 | ||
876 | /* Flooding new LSA through area. */ | |
877 | ospf_flood_through_area(area, NULL, new); | |
878 | ||
879 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
880 | zlog_debug("LSA[Type%d:%pI4]: Originate router-LSA %p", | |
881 | new->data->type, &new->data->id, | |
882 | (void *)new); | |
883 | ospf_lsa_header_dump(new->data); | |
884 | } | |
885 | ||
886 | return new; | |
887 | } | |
888 | ||
889 | /* Refresh router-LSA. */ | |
890 | static struct ospf_lsa *ospf_router_lsa_refresh(struct ospf_lsa *lsa) | |
891 | { | |
892 | struct ospf_area *area = lsa->area; | |
893 | struct ospf_lsa *new; | |
894 | ||
895 | /* Sanity check. */ | |
896 | assert(lsa->data); | |
897 | ||
898 | /* Delete LSA from neighbor retransmit-list. */ | |
899 | ospf_ls_retransmit_delete_nbr_area(area, lsa); | |
900 | ||
901 | /* Unregister LSA from refresh-list */ | |
902 | ospf_refresher_unregister_lsa(area->ospf, lsa); | |
903 | ||
904 | /* Create new router-LSA instance. */ | |
905 | if ((new = ospf_router_lsa_new(area)) == NULL) { | |
906 | zlog_err("%s: ospf_router_lsa_new returned NULL", __func__); | |
907 | return NULL; | |
908 | } | |
909 | ||
910 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
911 | ||
912 | ospf_lsa_install(area->ospf, NULL, new); | |
913 | ||
914 | /* Flood LSA through area. */ | |
915 | ospf_flood_through_area(area, NULL, new); | |
916 | ||
917 | /* Debug logging. */ | |
918 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
919 | zlog_debug("LSA[Type%d:%pI4]: router-LSA refresh", | |
920 | new->data->type, &new->data->id); | |
921 | ospf_lsa_header_dump(new->data); | |
922 | } | |
923 | ||
924 | return NULL; | |
925 | } | |
926 | ||
927 | int ospf_router_lsa_update_area(struct ospf_area *area) | |
928 | { | |
929 | if (IS_DEBUG_OSPF_EVENT) | |
930 | zlog_debug("[router-LSA]: (router-LSA area update)"); | |
931 | ||
932 | /* Now refresh router-LSA. */ | |
933 | if (area->router_lsa_self) | |
934 | ospf_lsa_refresh(area->ospf, area->router_lsa_self); | |
935 | /* Newly originate router-LSA. */ | |
936 | else | |
937 | ospf_router_lsa_originate(area); | |
938 | ||
939 | return 0; | |
940 | } | |
941 | ||
942 | int ospf_router_lsa_update(struct ospf *ospf) | |
943 | { | |
944 | struct listnode *node, *nnode; | |
945 | struct ospf_area *area; | |
946 | ||
947 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
948 | zlog_debug("Timer[router-LSA Update]: (timer expire)"); | |
949 | ||
950 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
951 | struct ospf_lsa *lsa = area->router_lsa_self; | |
952 | struct router_lsa *rl; | |
953 | const char *area_str; | |
954 | ||
955 | /* Keep Area ID string. */ | |
956 | area_str = AREA_NAME(area); | |
957 | ||
958 | /* If LSA not exist in this Area, originate new. */ | |
959 | if (lsa == NULL) { | |
960 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
961 | zlog_debug( | |
962 | "LSA[Type1]: Create router-LSA for Area %s", | |
963 | area_str); | |
964 | ||
965 | ospf_router_lsa_originate(area); | |
966 | } | |
967 | /* If router-ID is changed, Link ID must change. | |
968 | First flush old LSA, then originate new. */ | |
969 | else if (!IPV4_ADDR_SAME(&lsa->data->id, &ospf->router_id)) { | |
970 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
971 | zlog_debug( | |
972 | "LSA[Type%d:%pI4]: Refresh router-LSA for Area %s", | |
973 | lsa->data->type, | |
974 | &lsa->data->id, area_str); | |
975 | ospf_refresher_unregister_lsa(ospf, lsa); | |
976 | ospf_lsa_flush_area(lsa, area); | |
977 | ospf_lsa_unlock(&area->router_lsa_self); | |
978 | area->router_lsa_self = NULL; | |
979 | ||
980 | /* Refresh router-LSA, (not install) and flood through | |
981 | * area. */ | |
982 | ospf_router_lsa_update_area(area); | |
983 | } else { | |
984 | rl = (struct router_lsa *)lsa->data; | |
985 | /* Refresh router-LSA, (not install) and flood through | |
986 | * area. */ | |
987 | if (rl->flags != ospf->flags) | |
988 | ospf_router_lsa_update_area(area); | |
989 | } | |
990 | } | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | ||
996 | /* network-LSA related functions. */ | |
997 | /* Originate Network-LSA. */ | |
998 | static void ospf_network_lsa_body_set(struct stream *s, | |
999 | struct ospf_interface *oi) | |
1000 | { | |
1001 | struct in_addr mask; | |
1002 | struct route_node *rn; | |
1003 | struct ospf_neighbor *nbr; | |
1004 | ||
1005 | masklen2ip(oi->address->prefixlen, &mask); | |
1006 | stream_put_ipv4(s, mask.s_addr); | |
1007 | ||
1008 | /* The network-LSA lists those routers that are fully adjacent to | |
1009 | the Designated Router; each fully adjacent router is identified by | |
1010 | its OSPF Router ID. The Designated Router includes itself in this | |
1011 | list. RFC2328, Section 12.4.2 */ | |
1012 | ||
1013 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
1014 | if ((nbr = rn->info) != NULL) | |
1015 | if (nbr->state == NSM_Full || nbr == oi->nbr_self) | |
1016 | stream_put_ipv4(s, nbr->router_id.s_addr); | |
1017 | } | |
1018 | ||
1019 | static struct ospf_lsa *ospf_network_lsa_new(struct ospf_interface *oi) | |
1020 | { | |
1021 | struct stream *s; | |
1022 | struct ospf_lsa *new; | |
1023 | struct lsa_header *lsah; | |
1024 | struct ospf_if_params *oip; | |
1025 | int length; | |
1026 | ||
1027 | /* If there are no neighbours on this network (the net is stub), | |
1028 | the router does not originate network-LSA (see RFC 12.4.2) */ | |
1029 | if (oi->full_nbrs == 0) | |
1030 | return NULL; | |
1031 | ||
1032 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1033 | zlog_debug("LSA[Type2]: Create network-LSA instance"); | |
1034 | ||
1035 | /* Create new stream for LSA. */ | |
1036 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1037 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
1038 | ||
1039 | lsa_header_set(s, (OPTIONS(oi) | LSA_OPTIONS_GET(oi->area)), | |
1040 | OSPF_NETWORK_LSA, DR(oi), oi->ospf->router_id); | |
1041 | ||
1042 | /* Set network-LSA body fields. */ | |
1043 | ospf_network_lsa_body_set(s, oi); | |
1044 | ||
1045 | /* Set length. */ | |
1046 | length = stream_get_endp(s); | |
1047 | lsah->length = htons(length); | |
1048 | ||
1049 | /* Create OSPF LSA instance. */ | |
1050 | new = ospf_lsa_new_and_data(length); | |
1051 | ||
1052 | new->area = oi->area; | |
1053 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
1054 | new->vrf_id = oi->ospf->vrf_id; | |
1055 | ||
1056 | /* Copy LSA to store. */ | |
1057 | memcpy(new->data, lsah, length); | |
1058 | stream_free(s); | |
1059 | ||
1060 | /* Remember prior network LSA sequence numbers, even if we stop | |
1061 | * originating one for this oi, to try avoid re-originating LSAs with a | |
1062 | * prior sequence number, and thus speed up adjency forming & | |
1063 | * convergence. | |
1064 | */ | |
1065 | if ((oip = ospf_lookup_if_params(oi->ifp, oi->address->u.prefix4))) { | |
1066 | new->data->ls_seqnum = oip->network_lsa_seqnum; | |
1067 | new->data->ls_seqnum = lsa_seqnum_increment(new); | |
1068 | } else { | |
1069 | oip = ospf_get_if_params(oi->ifp, oi->address->u.prefix4); | |
1070 | ospf_if_update_params(oi->ifp, oi->address->u.prefix4); | |
1071 | } | |
1072 | oip->network_lsa_seqnum = new->data->ls_seqnum; | |
1073 | ||
1074 | return new; | |
1075 | } | |
1076 | ||
1077 | /* Originate network-LSA. */ | |
1078 | void ospf_network_lsa_update(struct ospf_interface *oi) | |
1079 | { | |
1080 | struct ospf_lsa *new; | |
1081 | ||
1082 | if (oi->area->ospf->gr_info.restart_in_progress) { | |
1083 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1084 | zlog_debug( | |
1085 | "LSA[Type%d]: Graceful Restart in progress, don't originate", | |
1086 | OSPF_NETWORK_LSA); | |
1087 | return; | |
1088 | } | |
1089 | ||
1090 | if (oi->network_lsa_self != NULL) { | |
1091 | ospf_lsa_refresh(oi->ospf, oi->network_lsa_self); | |
1092 | return; | |
1093 | } | |
1094 | ||
1095 | /* Create new network-LSA instance. */ | |
1096 | new = ospf_network_lsa_new(oi); | |
1097 | if (new == NULL) | |
1098 | return; | |
1099 | ||
1100 | /* Install LSA to LSDB. */ | |
1101 | new = ospf_lsa_install(oi->ospf, oi, new); | |
1102 | ||
1103 | /* Update LSA origination count. */ | |
1104 | oi->ospf->lsa_originate_count++; | |
1105 | ||
1106 | /* Flooding new LSA through area. */ | |
1107 | ospf_flood_through_area(oi->area, NULL, new); | |
1108 | ||
1109 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1110 | zlog_debug("LSA[Type%d:%pI4]: Originate network-LSA %p", | |
1111 | new->data->type, &new->data->id, | |
1112 | (void *)new); | |
1113 | ospf_lsa_header_dump(new->data); | |
1114 | } | |
1115 | ||
1116 | return; | |
1117 | } | |
1118 | ||
1119 | static struct ospf_lsa *ospf_network_lsa_refresh(struct ospf_lsa *lsa) | |
1120 | { | |
1121 | struct ospf_area *area = lsa->area; | |
1122 | struct ospf_lsa *new, *new2; | |
1123 | struct ospf_if_params *oip; | |
1124 | struct ospf_interface *oi; | |
1125 | ||
1126 | assert(lsa->data); | |
1127 | ||
1128 | /* Retrieve the oi for the network LSA */ | |
1129 | oi = ospf_if_lookup_by_local_addr(area->ospf, NULL, lsa->data->id); | |
1130 | if (oi == NULL) { | |
1131 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1132 | zlog_debug( | |
1133 | "LSA[Type%d:%pI4]: network-LSA refresh: no oi found, ick, ignoring.", | |
1134 | lsa->data->type, &lsa->data->id); | |
1135 | ospf_lsa_header_dump(lsa->data); | |
1136 | } | |
1137 | return NULL; | |
1138 | } | |
1139 | /* Delete LSA from neighbor retransmit-list. */ | |
1140 | ospf_ls_retransmit_delete_nbr_area(area, lsa); | |
1141 | ||
1142 | /* Unregister LSA from refresh-list */ | |
1143 | ospf_refresher_unregister_lsa(area->ospf, lsa); | |
1144 | ||
1145 | /* Create new network-LSA instance. */ | |
1146 | new = ospf_network_lsa_new(oi); | |
1147 | if (new == NULL) | |
1148 | return NULL; | |
1149 | ||
1150 | oip = ospf_lookup_if_params(oi->ifp, oi->address->u.prefix4); | |
1151 | assert(oip != NULL); | |
1152 | oip->network_lsa_seqnum = new->data->ls_seqnum = | |
1153 | lsa_seqnum_increment(lsa); | |
1154 | ||
1155 | new2 = ospf_lsa_install(area->ospf, oi, new); | |
1156 | ||
1157 | assert(new2 == new); | |
1158 | ||
1159 | /* Flood LSA through aera. */ | |
1160 | ospf_flood_through_area(area, NULL, new); | |
1161 | ||
1162 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1163 | zlog_debug("LSA[Type%d:%pI4]: network-LSA refresh", | |
1164 | new->data->type, &new->data->id); | |
1165 | ospf_lsa_header_dump(new->data); | |
1166 | } | |
1167 | ||
1168 | return new; | |
1169 | } | |
1170 | ||
1171 | static void stream_put_ospf_metric(struct stream *s, uint32_t metric_value) | |
1172 | { | |
1173 | uint32_t metric; | |
1174 | char *mp; | |
1175 | ||
1176 | /* Put 0 metric. TOS metric is not supported. */ | |
1177 | metric = htonl(metric_value); | |
1178 | mp = (char *)&metric; | |
1179 | mp++; | |
1180 | stream_put(s, mp, 3); | |
1181 | } | |
1182 | ||
1183 | /* summary-LSA related functions. */ | |
1184 | static void ospf_summary_lsa_body_set(struct stream *s, struct prefix *p, | |
1185 | uint32_t metric) | |
1186 | { | |
1187 | struct in_addr mask; | |
1188 | ||
1189 | masklen2ip(p->prefixlen, &mask); | |
1190 | ||
1191 | /* Put Network Mask. */ | |
1192 | stream_put_ipv4(s, mask.s_addr); | |
1193 | ||
1194 | /* Set # TOS. */ | |
1195 | stream_putc(s, (uint8_t)0); | |
1196 | ||
1197 | /* Set metric. */ | |
1198 | stream_put_ospf_metric(s, metric); | |
1199 | } | |
1200 | ||
1201 | static struct ospf_lsa *ospf_summary_lsa_new(struct ospf_area *area, | |
1202 | struct prefix *p, uint32_t metric, | |
1203 | struct in_addr id) | |
1204 | { | |
1205 | struct stream *s; | |
1206 | struct ospf_lsa *new; | |
1207 | struct lsa_header *lsah; | |
1208 | int length; | |
1209 | ||
1210 | if (id.s_addr == 0xffffffff) { | |
1211 | /* Maybe Link State ID not available. */ | |
1212 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1213 | zlog_debug( | |
1214 | "LSA[Type%d]: Link ID not available, can't originate", | |
1215 | OSPF_SUMMARY_LSA); | |
1216 | return NULL; | |
1217 | } | |
1218 | ||
1219 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1220 | zlog_debug("LSA[Type3]: Create summary-LSA instance"); | |
1221 | ||
1222 | /* Create new stream for LSA. */ | |
1223 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1224 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
1225 | ||
1226 | lsa_header_set(s, LSA_OPTIONS_GET(area), OSPF_SUMMARY_LSA, id, | |
1227 | area->ospf->router_id); | |
1228 | ||
1229 | /* Set summary-LSA body fields. */ | |
1230 | ospf_summary_lsa_body_set(s, p, metric); | |
1231 | ||
1232 | /* Set length. */ | |
1233 | length = stream_get_endp(s); | |
1234 | lsah->length = htons(length); | |
1235 | ||
1236 | /* Create OSPF LSA instance. */ | |
1237 | new = ospf_lsa_new_and_data(length); | |
1238 | new->area = area; | |
1239 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
1240 | new->vrf_id = area->ospf->vrf_id; | |
1241 | ||
1242 | /* Copy LSA to store. */ | |
1243 | memcpy(new->data, lsah, length); | |
1244 | stream_free(s); | |
1245 | ||
1246 | return new; | |
1247 | } | |
1248 | ||
1249 | /* Originate Summary-LSA. */ | |
1250 | static struct ospf_lsa * | |
1251 | ospf_summary_lsa_prepare_and_flood(struct prefix_ipv4 *p, uint32_t metric, | |
1252 | struct ospf_area *area, struct in_addr id) | |
1253 | { | |
1254 | struct ospf_lsa *new; | |
1255 | ||
1256 | /* Create new summary-LSA instance. */ | |
1257 | if (!(new = ospf_summary_lsa_new(area, (struct prefix *)p, metric, id))) | |
1258 | return NULL; | |
1259 | ||
1260 | /* Instlal LSA to LSDB. */ | |
1261 | new = ospf_lsa_install(area->ospf, NULL, new); | |
1262 | ||
1263 | /* Update LSA origination count. */ | |
1264 | area->ospf->lsa_originate_count++; | |
1265 | ||
1266 | /* Flooding new LSA through area. */ | |
1267 | ospf_flood_through_area(area, NULL, new); | |
1268 | ||
1269 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1270 | zlog_debug("LSA[Type%d:%pI4]: Originate summary-LSA %p", | |
1271 | new->data->type, &new->data->id, | |
1272 | (void *)new); | |
1273 | ospf_lsa_header_dump(new->data); | |
1274 | } | |
1275 | ||
1276 | return new; | |
1277 | } | |
1278 | ||
1279 | static struct ospf_lsa *ospf_handle_summarylsa_lsId_chg(struct ospf *ospf, | |
1280 | struct prefix_ipv4 *p, | |
1281 | uint8_t type, | |
1282 | uint32_t metric, | |
1283 | struct in_addr old_id) | |
1284 | { | |
1285 | struct ospf_lsa *lsa = NULL; | |
1286 | struct ospf_lsa *new = NULL; | |
1287 | struct summary_lsa *sl = NULL; | |
1288 | struct ospf_area *old_area = NULL; | |
1289 | struct prefix_ipv4 old_prefix; | |
1290 | uint32_t old_metric; | |
1291 | struct in_addr mask; | |
1292 | uint32_t metric_val; | |
1293 | char *metric_buf; | |
1294 | ||
1295 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, type, p->prefix, | |
1296 | ospf->router_id); | |
1297 | ||
1298 | if (!lsa) { | |
1299 | flog_warn(EC_OSPF_LSA_NULL, "(%s): LSA not found", __func__); | |
1300 | return NULL; | |
1301 | } | |
1302 | ||
1303 | sl = (struct summary_lsa *)lsa->data; | |
1304 | ||
1305 | old_area = lsa->area; | |
1306 | old_metric = GET_METRIC(sl->metric); | |
1307 | old_prefix.prefix = sl->header.id; | |
1308 | old_prefix.prefixlen = ip_masklen(sl->mask); | |
1309 | old_prefix.family = AF_INET; | |
1310 | ||
1311 | ||
1312 | /* change the mask */ | |
1313 | masklen2ip(p->prefixlen, &mask); | |
1314 | sl->mask.s_addr = mask.s_addr; | |
1315 | ||
1316 | /* Copy the metric*/ | |
1317 | metric_val = htonl(metric); | |
1318 | metric_buf = (char *)&metric_val; | |
1319 | memcpy(sl->metric, metric_buf, sizeof(metric_val)); | |
1320 | ||
1321 | if (type == OSPF_SUMMARY_LSA) { | |
1322 | /*Refresh the LSA with new LSA*/ | |
1323 | ospf_summary_lsa_refresh(ospf, lsa); | |
1324 | ||
1325 | new = ospf_summary_lsa_prepare_and_flood( | |
1326 | &old_prefix, old_metric, old_area, old_id); | |
1327 | } else { | |
1328 | /*Refresh the LSA with new LSA*/ | |
1329 | ospf_summary_asbr_lsa_refresh(ospf, lsa); | |
1330 | ||
1331 | new = ospf_asbr_summary_lsa_prepare_and_flood( | |
1332 | &old_prefix, old_metric, old_area, old_id); | |
1333 | } | |
1334 | ||
1335 | return new; | |
1336 | } | |
1337 | ||
1338 | /* Originate Summary-LSA. */ | |
1339 | struct ospf_lsa *ospf_summary_lsa_originate(struct prefix_ipv4 *p, | |
1340 | uint32_t metric, | |
1341 | struct ospf_area *area) | |
1342 | { | |
1343 | struct in_addr id; | |
1344 | enum lsid_status status; | |
1345 | struct ospf_lsa *new = NULL; | |
1346 | ||
1347 | status = ospf_lsa_unique_id(area->ospf, area->lsdb, OSPF_SUMMARY_LSA, p, | |
1348 | &id); | |
1349 | ||
1350 | if (status == LSID_CHANGE) { | |
1351 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1352 | zlog_debug("Link ID has to be changed."); | |
1353 | ||
1354 | new = ospf_handle_summarylsa_lsId_chg( | |
1355 | area->ospf, p, OSPF_SUMMARY_LSA, metric, id); | |
1356 | return new; | |
1357 | } else if (status == LSID_NOT_AVAILABLE) { | |
1358 | /* Link State ID not available. */ | |
1359 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1360 | zlog_debug( | |
1361 | "LSA[Type5]: Link ID not available, can't originate"); | |
1362 | ||
1363 | return NULL; | |
1364 | } | |
1365 | ||
1366 | new = ospf_summary_lsa_prepare_and_flood(p, metric, area, id); | |
1367 | return new; | |
1368 | } | |
1369 | ||
1370 | static struct ospf_lsa *ospf_summary_lsa_refresh(struct ospf *ospf, | |
1371 | struct ospf_lsa *lsa) | |
1372 | { | |
1373 | struct ospf_lsa *new; | |
1374 | struct summary_lsa *sl; | |
1375 | struct prefix p; | |
1376 | ||
1377 | /* Sanity check. */ | |
1378 | assert(lsa->data); | |
1379 | ||
1380 | sl = (struct summary_lsa *)lsa->data; | |
1381 | p.prefixlen = ip_masklen(sl->mask); | |
1382 | new = ospf_summary_lsa_new(lsa->area, &p, GET_METRIC(sl->metric), | |
1383 | sl->header.id); | |
1384 | ||
1385 | if (!new) | |
1386 | return NULL; | |
1387 | ||
1388 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
1389 | ||
1390 | ospf_lsa_install(ospf, NULL, new); | |
1391 | ||
1392 | /* Flood LSA through AS. */ | |
1393 | ospf_flood_through_area(new->area, NULL, new); | |
1394 | ||
1395 | /* Debug logging. */ | |
1396 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1397 | zlog_debug("LSA[Type%d:%pI4]: summary-LSA refresh", | |
1398 | new->data->type, &new->data->id); | |
1399 | ospf_lsa_header_dump(new->data); | |
1400 | } | |
1401 | ||
1402 | return new; | |
1403 | } | |
1404 | ||
1405 | ||
1406 | /* summary-ASBR-LSA related functions. */ | |
1407 | static void ospf_summary_asbr_lsa_body_set(struct stream *s, struct prefix *p, | |
1408 | uint32_t metric) | |
1409 | { | |
1410 | /* Put Network Mask. */ | |
1411 | stream_put_ipv4(s, (uint32_t)0); | |
1412 | ||
1413 | /* Set # TOS. */ | |
1414 | stream_putc(s, (uint8_t)0); | |
1415 | ||
1416 | /* Set metric. */ | |
1417 | stream_put_ospf_metric(s, metric); | |
1418 | } | |
1419 | ||
1420 | static struct ospf_lsa *ospf_summary_asbr_lsa_new(struct ospf_area *area, | |
1421 | struct prefix *p, | |
1422 | uint32_t metric, | |
1423 | struct in_addr id) | |
1424 | { | |
1425 | struct stream *s; | |
1426 | struct ospf_lsa *new; | |
1427 | struct lsa_header *lsah; | |
1428 | int length; | |
1429 | ||
1430 | if (id.s_addr == 0xffffffff) { | |
1431 | /* Maybe Link State ID not available. */ | |
1432 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1433 | zlog_debug( | |
1434 | "LSA[Type%d]: Link ID not available, can't originate", | |
1435 | OSPF_ASBR_SUMMARY_LSA); | |
1436 | return NULL; | |
1437 | } | |
1438 | ||
1439 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1440 | zlog_debug("LSA[Type3]: Create summary-LSA instance"); | |
1441 | ||
1442 | /* Create new stream for LSA. */ | |
1443 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1444 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
1445 | ||
1446 | lsa_header_set(s, LSA_OPTIONS_GET(area), OSPF_ASBR_SUMMARY_LSA, id, | |
1447 | area->ospf->router_id); | |
1448 | ||
1449 | /* Set summary-LSA body fields. */ | |
1450 | ospf_summary_asbr_lsa_body_set(s, p, metric); | |
1451 | ||
1452 | /* Set length. */ | |
1453 | length = stream_get_endp(s); | |
1454 | lsah->length = htons(length); | |
1455 | ||
1456 | /* Create OSPF LSA instance. */ | |
1457 | new = ospf_lsa_new_and_data(length); | |
1458 | new->area = area; | |
1459 | SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED); | |
1460 | new->vrf_id = area->ospf->vrf_id; | |
1461 | ||
1462 | /* Copy LSA to store. */ | |
1463 | memcpy(new->data, lsah, length); | |
1464 | stream_free(s); | |
1465 | ||
1466 | return new; | |
1467 | } | |
1468 | ||
1469 | /* Originate summary-ASBR-LSA. */ | |
1470 | static struct ospf_lsa * | |
1471 | ospf_asbr_summary_lsa_prepare_and_flood(struct prefix_ipv4 *p, uint32_t metric, | |
1472 | struct ospf_area *area, | |
1473 | struct in_addr id) | |
1474 | { | |
1475 | struct ospf_lsa *new; | |
1476 | ||
1477 | /* Create new summary-LSA instance. */ | |
1478 | new = ospf_summary_asbr_lsa_new(area, (struct prefix *)p, metric, id); | |
1479 | if (!new) | |
1480 | return NULL; | |
1481 | ||
1482 | /* Install LSA to LSDB. */ | |
1483 | new = ospf_lsa_install(area->ospf, NULL, new); | |
1484 | ||
1485 | /* Update LSA origination count. */ | |
1486 | area->ospf->lsa_originate_count++; | |
1487 | ||
1488 | /* Flooding new LSA through area. */ | |
1489 | ospf_flood_through_area(area, NULL, new); | |
1490 | ||
1491 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1492 | zlog_debug("LSA[Type%d:%pI4]: Originate summary-ASBR-LSA %p", | |
1493 | new->data->type, &new->data->id, | |
1494 | (void *)new); | |
1495 | ospf_lsa_header_dump(new->data); | |
1496 | } | |
1497 | ||
1498 | return new; | |
1499 | } | |
1500 | ||
1501 | struct ospf_lsa *ospf_summary_asbr_lsa_originate(struct prefix_ipv4 *p, | |
1502 | uint32_t metric, | |
1503 | struct ospf_area *area) | |
1504 | { | |
1505 | struct ospf_lsa *new; | |
1506 | struct in_addr id; | |
1507 | enum lsid_status status; | |
1508 | ||
1509 | status = ospf_lsa_unique_id(area->ospf, area->lsdb, | |
1510 | OSPF_ASBR_SUMMARY_LSA, p, &id); | |
1511 | ||
1512 | if (status == LSID_CHANGE) { | |
1513 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1514 | zlog_debug("Link ID has to be changed."); | |
1515 | ||
1516 | new = ospf_handle_summarylsa_lsId_chg( | |
1517 | area->ospf, p, OSPF_ASBR_SUMMARY_LSA, metric, id); | |
1518 | return new; | |
1519 | } else if (status == LSID_NOT_AVAILABLE) { | |
1520 | /* Link State ID not available. */ | |
1521 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1522 | zlog_debug( | |
1523 | "LSA[Type5]: Link ID not available, can't originate"); | |
1524 | ||
1525 | return NULL; | |
1526 | } | |
1527 | ||
1528 | new = ospf_asbr_summary_lsa_prepare_and_flood(p, metric, area, id); | |
1529 | return new; | |
1530 | } | |
1531 | ||
1532 | static struct ospf_lsa *ospf_summary_asbr_lsa_refresh(struct ospf *ospf, | |
1533 | struct ospf_lsa *lsa) | |
1534 | { | |
1535 | struct ospf_lsa *new; | |
1536 | struct summary_lsa *sl; | |
1537 | struct prefix p; | |
1538 | ||
1539 | /* Sanity check. */ | |
1540 | assert(lsa->data); | |
1541 | ||
1542 | sl = (struct summary_lsa *)lsa->data; | |
1543 | p.prefixlen = ip_masklen(sl->mask); | |
1544 | new = ospf_summary_asbr_lsa_new(lsa->area, &p, GET_METRIC(sl->metric), | |
1545 | sl->header.id); | |
1546 | if (!new) | |
1547 | return NULL; | |
1548 | ||
1549 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
1550 | ||
1551 | ospf_lsa_install(ospf, NULL, new); | |
1552 | ||
1553 | /* Flood LSA through area. */ | |
1554 | ospf_flood_through_area(new->area, NULL, new); | |
1555 | ||
1556 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
1557 | zlog_debug("LSA[Type%d:%pI4]: summary-ASBR-LSA refresh", | |
1558 | new->data->type, &new->data->id); | |
1559 | ospf_lsa_header_dump(new->data); | |
1560 | } | |
1561 | ||
1562 | return new; | |
1563 | } | |
1564 | ||
1565 | /* AS-external-LSA related functions. */ | |
1566 | ||
1567 | /* Get nexthop for AS-external-LSAs. Return nexthop if its interface | |
1568 | is connected, else 0*/ | |
1569 | static struct in_addr ospf_external_lsa_nexthop_get(struct ospf *ospf, | |
1570 | struct in_addr nexthop) | |
1571 | { | |
1572 | struct in_addr fwd; | |
1573 | struct prefix nh; | |
1574 | struct listnode *node; | |
1575 | struct ospf_interface *oi; | |
1576 | ||
1577 | fwd.s_addr = 0; | |
1578 | ||
1579 | if (!nexthop.s_addr) | |
1580 | return fwd; | |
1581 | ||
1582 | /* Check whether nexthop is covered by OSPF network. */ | |
1583 | nh.family = AF_INET; | |
1584 | nh.u.prefix4 = nexthop; | |
1585 | nh.prefixlen = IPV4_MAX_BITLEN; | |
1586 | ||
1587 | /* XXX/SCALE: If there were a lot of oi's on an ifp, then it'd be | |
1588 | * better to make use of the per-ifp table of ois. | |
1589 | */ | |
1590 | for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) | |
1591 | if (if_is_operative(oi->ifp)) | |
1592 | if (oi->address->family == AF_INET) | |
1593 | if (prefix_match(oi->address, &nh)) | |
1594 | return nexthop; | |
1595 | ||
1596 | return fwd; | |
1597 | } | |
1598 | ||
1599 | /* NSSA-external-LSA related functions. */ | |
1600 | ||
1601 | /* Get 1st IP connection for Forward Addr */ | |
1602 | ||
1603 | struct in_addr ospf_get_ip_from_ifp(struct ospf_interface *oi) | |
1604 | { | |
1605 | struct in_addr fwd; | |
1606 | ||
1607 | fwd.s_addr = INADDR_ANY; | |
1608 | ||
1609 | if (if_is_operative(oi->ifp)) | |
1610 | return oi->address->u.prefix4; | |
1611 | ||
1612 | return fwd; | |
1613 | } | |
1614 | ||
1615 | /* Get 1st IP connection for Forward Addr */ | |
1616 | struct in_addr ospf_get_nssa_ip(struct ospf_area *area) | |
1617 | { | |
1618 | struct in_addr fwd; | |
1619 | struct in_addr best_default; | |
1620 | struct listnode *node; | |
1621 | struct ospf_interface *oi; | |
1622 | ||
1623 | fwd.s_addr = 0; | |
1624 | best_default.s_addr = 0; | |
1625 | ||
1626 | for (ALL_LIST_ELEMENTS_RO(area->ospf->oiflist, node, oi)) { | |
1627 | if (if_is_operative(oi->ifp)) | |
1628 | if (oi->area->external_routing == OSPF_AREA_NSSA) | |
1629 | if (oi->address | |
1630 | && oi->address->family == AF_INET) { | |
1631 | if (best_default.s_addr == INADDR_ANY) | |
1632 | best_default = | |
1633 | oi->address->u.prefix4; | |
1634 | if (oi->area == area) | |
1635 | return oi->address->u.prefix4; | |
1636 | } | |
1637 | } | |
1638 | if (best_default.s_addr != INADDR_ANY) | |
1639 | return best_default; | |
1640 | ||
1641 | if (best_default.s_addr != INADDR_ANY) | |
1642 | return best_default; | |
1643 | ||
1644 | return fwd; | |
1645 | } | |
1646 | ||
1647 | int metric_type(struct ospf *ospf, uint8_t src, unsigned short instance) | |
1648 | { | |
1649 | struct ospf_redist *red; | |
1650 | ||
1651 | red = ospf_redist_lookup(ospf, src, instance); | |
1652 | ||
1653 | return ((!red || red->dmetric.type < 0) ? DEFAULT_METRIC_TYPE | |
1654 | : red->dmetric.type); | |
1655 | } | |
1656 | ||
1657 | int metric_value(struct ospf *ospf, uint8_t src, unsigned short instance) | |
1658 | { | |
1659 | struct ospf_redist *red; | |
1660 | ||
1661 | red = ospf_redist_lookup(ospf, src, instance); | |
1662 | if (!red || red->dmetric.value < 0) { | |
1663 | if (src == DEFAULT_ROUTE) { | |
1664 | if (ospf->default_originate == DEFAULT_ORIGINATE_ZEBRA) | |
1665 | return DEFAULT_DEFAULT_ORIGINATE_METRIC; | |
1666 | else | |
1667 | return DEFAULT_DEFAULT_ALWAYS_METRIC; | |
1668 | } else if (ospf->default_metric < 0) | |
1669 | return DEFAULT_DEFAULT_METRIC; | |
1670 | else | |
1671 | return ospf->default_metric; | |
1672 | } | |
1673 | ||
1674 | return red->dmetric.value; | |
1675 | } | |
1676 | ||
1677 | /* Set AS-external-LSA body. */ | |
1678 | static void ospf_external_lsa_body_set(struct stream *s, | |
1679 | struct external_info *ei, | |
1680 | struct ospf *ospf) | |
1681 | { | |
1682 | struct prefix_ipv4 *p = &ei->p; | |
1683 | struct in_addr mask, fwd_addr; | |
1684 | uint32_t mvalue; | |
1685 | int mtype; | |
1686 | int type; | |
1687 | unsigned short instance; | |
1688 | ||
1689 | /* Put Network Mask. */ | |
1690 | masklen2ip(p->prefixlen, &mask); | |
1691 | stream_put_ipv4(s, mask.s_addr); | |
1692 | ||
1693 | /* If prefix is default, specify DEFAULT_ROUTE. */ | |
1694 | type = is_default_prefix4(&ei->p) ? DEFAULT_ROUTE : ei->type; | |
1695 | instance = is_default_prefix4(&ei->p) ? 0 : ei->instance; | |
1696 | ||
1697 | mtype = (ROUTEMAP_METRIC_TYPE(ei) != -1) | |
1698 | ? ROUTEMAP_METRIC_TYPE(ei) | |
1699 | : metric_type(ospf, type, instance); | |
1700 | ||
1701 | mvalue = (ROUTEMAP_METRIC(ei) != -1) | |
1702 | ? ROUTEMAP_METRIC(ei) | |
1703 | : metric_value(ospf, type, instance); | |
1704 | ||
1705 | /* Put type of external metric. */ | |
1706 | stream_putc(s, (mtype == EXTERNAL_METRIC_TYPE_2 ? 0x80 : 0)); | |
1707 | ||
1708 | /* Put 0 metric. TOS metric is not supported. */ | |
1709 | stream_put_ospf_metric(s, mvalue); | |
1710 | ||
1711 | /* Get forwarding address to nexthop if on the Connection List, else 0. | |
1712 | */ | |
1713 | fwd_addr = ospf_external_lsa_nexthop_get(ospf, ei->nexthop); | |
1714 | ||
1715 | /* Put forwarding address. */ | |
1716 | stream_put_ipv4(s, fwd_addr.s_addr); | |
1717 | ||
1718 | /* Put route tag */ | |
1719 | stream_putl(s, ei->tag); | |
1720 | } | |
1721 | ||
1722 | /* Create new external-LSA. */ | |
1723 | static struct ospf_lsa * | |
1724 | ospf_exnl_lsa_prepare_and_flood(struct ospf *ospf, struct external_info *ei, | |
1725 | struct in_addr id) | |
1726 | { | |
1727 | struct stream *s; | |
1728 | struct lsa_header *lsah; | |
1729 | struct ospf_lsa *new; | |
1730 | int length; | |
1731 | ||
1732 | /* Create new stream for LSA. */ | |
1733 | s = stream_new(OSPF_MAX_LSA_SIZE); | |
1734 | lsah = (struct lsa_header *)STREAM_DATA(s); | |
1735 | ||
1736 | /* Set LSA common header fields. */ | |
1737 | lsa_header_set(s, OSPF_OPTION_E, OSPF_AS_EXTERNAL_LSA, id, | |
1738 | ospf->router_id); | |
1739 | ||
1740 | /* Set AS-external-LSA body fields. */ | |
1741 | ospf_external_lsa_body_set(s, ei, ospf); | |
1742 | ||
1743 | /* Set length. */ | |
1744 | length = stream_get_endp(s); | |
1745 | lsah->length = htons(length); | |
1746 | ||
1747 | /* Now, create OSPF LSA instance. */ | |
1748 | new = ospf_lsa_new_and_data(length); | |
1749 | new->area = NULL; | |
1750 | SET_FLAG(new->flags, | |
1751 | OSPF_LSA_SELF | OSPF_LSA_APPROVED | OSPF_LSA_SELF_CHECKED); | |
1752 | new->vrf_id = ospf->vrf_id; | |
1753 | ||
1754 | /* Copy LSA data to store, discard stream. */ | |
1755 | memcpy(new->data, lsah, length); | |
1756 | stream_free(s); | |
1757 | ||
1758 | return new; | |
1759 | } | |
1760 | ||
1761 | static struct ospf_lsa *ospf_handle_exnl_lsa_lsId_chg(struct ospf *ospf, | |
1762 | struct external_info *ei, | |
1763 | struct in_addr id) | |
1764 | { | |
1765 | struct ospf_lsa *lsa; | |
1766 | struct as_external_lsa *al; | |
1767 | struct in_addr mask; | |
1768 | struct ospf_lsa *new; | |
1769 | struct external_info ei_summary = {}; | |
1770 | struct external_info *ei_old; | |
1771 | ||
1772 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA, | |
1773 | ei->p.prefix, ospf->router_id); | |
1774 | ||
1775 | if (!lsa) { | |
1776 | flog_warn(EC_OSPF_LSA_NULL, "(%s): LSA not found", __func__); | |
1777 | return NULL; | |
1778 | } | |
1779 | ||
1780 | ei_old = ospf_external_info_check(ospf, lsa); | |
1781 | ||
1782 | al = (struct as_external_lsa *)lsa->data; | |
1783 | ||
1784 | if (!ei_old) { | |
1785 | /* eii_old pointer of LSA is NULL, this | |
1786 | * must be external aggregate route. | |
1787 | */ | |
1788 | ei_summary.p.family = AF_INET; | |
1789 | ei_summary.p.prefix = al->header.id; | |
1790 | ei_summary.p.prefixlen = ip_masklen(al->mask); | |
1791 | ei_summary.tag = (unsigned long)ntohl(al->e[0].route_tag); | |
1792 | ei_old = &ei_summary; | |
1793 | } | |
1794 | ||
1795 | /* change the mask */ | |
1796 | masklen2ip(ei->p.prefixlen, &mask); | |
1797 | al->mask.s_addr = mask.s_addr; | |
1798 | ||
1799 | /*Refresh the LSA with new LSA*/ | |
1800 | ospf_external_lsa_refresh(ospf, lsa, ei, LSA_REFRESH_FORCE, 0); | |
1801 | ||
1802 | /*Originate the old LSA with changed LSID*/ | |
1803 | new = ospf_exnl_lsa_prepare_and_flood(ospf, ei_old, id); | |
1804 | ||
1805 | return new; | |
1806 | } | |
1807 | ||
1808 | static struct ospf_lsa *ospf_external_lsa_new(struct ospf *ospf, | |
1809 | struct external_info *ei, | |
1810 | struct in_addr *old_id) | |
1811 | { | |
1812 | struct ospf_lsa *new; | |
1813 | struct in_addr id; | |
1814 | enum lsid_status status; | |
1815 | ||
1816 | if (ei == NULL) { | |
1817 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1818 | zlog_debug( | |
1819 | "LSA[Type5]: External info is NULL, can't originate"); | |
1820 | return NULL; | |
1821 | } | |
1822 | ||
1823 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1824 | zlog_debug("LSA[Type5]: Originate AS-external-LSA instance"); | |
1825 | ||
1826 | /* If old Link State ID is specified, refresh LSA with same ID. */ | |
1827 | if (old_id) | |
1828 | id = *old_id; | |
1829 | /* Get Link State with unique ID. */ | |
1830 | else { | |
1831 | status = ospf_lsa_unique_id(ospf, ospf->lsdb, | |
1832 | OSPF_AS_EXTERNAL_LSA, &ei->p, &id); | |
1833 | ||
1834 | if (status == LSID_CHANGE) { | |
1835 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1836 | zlog_debug("Link ID has to be changed."); | |
1837 | ||
1838 | new = ospf_handle_exnl_lsa_lsId_chg(ospf, ei, id); | |
1839 | return new; | |
1840 | } else if (status == LSID_NOT_AVAILABLE) { | |
1841 | /* Link State ID not available. */ | |
1842 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
1843 | zlog_debug( | |
1844 | "LSA[Type5]: Link ID not available, can't originate"); | |
1845 | return NULL; | |
1846 | } | |
1847 | } | |
1848 | ||
1849 | new = ospf_exnl_lsa_prepare_and_flood(ospf, ei, id); | |
1850 | ||
1851 | return new; | |
1852 | } | |
1853 | ||
1854 | /* As Type-7 */ | |
1855 | static void ospf_install_flood_nssa(struct ospf *ospf, struct ospf_lsa *lsa, | |
1856 | struct external_info *ei) | |
1857 | { | |
1858 | struct ospf_lsa *new; | |
1859 | struct as_external_lsa *extlsa; | |
1860 | struct ospf_area *area; | |
1861 | struct listnode *node, *nnode; | |
1862 | ||
1863 | /* LSA may be a Type-5 originated via translation of a Type-7 LSA | |
1864 | * which originated from an NSSA area. In which case it should not be | |
1865 | * flooded back to NSSA areas. | |
1866 | */ | |
1867 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
1868 | return; | |
1869 | ||
1870 | /* NSSA Originate or Refresh (If anyNSSA) | |
1871 | ||
1872 | LSA is self-originated. And just installed as Type-5. | |
1873 | Additionally, install as Type-7 LSDB for every attached NSSA. | |
1874 | ||
1875 | P-Bit controls which ABR performs translation to outside world; If | |
1876 | we are an ABR....do not set the P-bit, because we send the Type-5, | |
1877 | not as the ABR Translator, but as the ASBR owner within the AS! | |
1878 | ||
1879 | If we are NOT ABR, Flood through NSSA as Type-7 w/P-bit set. The | |
1880 | elected ABR Translator will see the P-bit, Translate, and re-flood. | |
1881 | ||
1882 | Later, ABR_TASK and P-bit will scan Type-7 LSDB and translate to | |
1883 | Type-5's to non-NSSA Areas. (it will also attempt a re-install) */ | |
1884 | ||
1885 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
1886 | /* Don't install Type-7 LSA's into nonNSSA area */ | |
1887 | if (area->external_routing != OSPF_AREA_NSSA) | |
1888 | continue; | |
1889 | ||
1890 | /* make lsa duplicate, lock=1 */ | |
1891 | new = ospf_lsa_dup(lsa); | |
1892 | new->area = area; | |
1893 | new->data->type = OSPF_AS_NSSA_LSA; | |
1894 | ||
1895 | /* set P-bit if not ABR */ | |
1896 | if (!IS_OSPF_ABR(ospf)) { | |
1897 | SET_FLAG(new->data->options, OSPF_OPTION_NP); | |
1898 | ||
1899 | /* set non-zero FWD ADDR | |
1900 | ||
1901 | draft-ietf-ospf-nssa-update-09.txt | |
1902 | ||
1903 | if the network between the NSSA AS boundary router and | |
1904 | the | |
1905 | adjacent AS is advertised into OSPF as an internal OSPF | |
1906 | route, | |
1907 | the forwarding address should be the next op address as | |
1908 | is cu | |
1909 | currently done with type-5 LSAs. If the intervening | |
1910 | network is | |
1911 | not adversited into OSPF as an internal OSPF route and | |
1912 | the | |
1913 | type-7 LSA's P-bit is set a forwarding address should be | |
1914 | selected from one of the router's active OSPF interface | |
1915 | addresses | |
1916 | which belong to the NSSA. If no such addresses exist, | |
1917 | then | |
1918 | no type-7 LSA's with the P-bit set should originate from | |
1919 | this | |
1920 | router. */ | |
1921 | ||
1922 | /* kevinm: not updating lsa anymore, just new */ | |
1923 | extlsa = (struct as_external_lsa *)(new->data); | |
1924 | ||
1925 | if (extlsa->e[0].fwd_addr.s_addr == INADDR_ANY) | |
1926 | extlsa->e[0].fwd_addr = ospf_get_nssa_ip( | |
1927 | area); /* this NSSA area in ifp */ | |
1928 | ||
1929 | if (extlsa->e[0].fwd_addr.s_addr == INADDR_ANY) { | |
1930 | if (IS_DEBUG_OSPF_NSSA) | |
1931 | zlog_debug( | |
1932 | "LSA[Type-7]: Could not build FWD-ADDR"); | |
1933 | ospf_lsa_discard(new); | |
1934 | return; | |
1935 | } | |
1936 | } | |
1937 | ||
1938 | /* install also as Type-7 */ | |
1939 | ospf_lsa_install(ospf, NULL, | |
1940 | new); /* Remove Old, Lock New = 2 */ | |
1941 | ||
1942 | /* will send each copy, lock=2+n */ | |
1943 | ospf_flood_through_as( | |
1944 | ospf, NULL, new); /* all attached NSSA's, no AS/STUBs */ | |
1945 | } | |
1946 | } | |
1947 | ||
1948 | static struct ospf_lsa *ospf_lsa_translated_nssa_new(struct ospf *ospf, | |
1949 | struct ospf_lsa *type7) | |
1950 | { | |
1951 | ||
1952 | struct ospf_lsa *new; | |
1953 | struct as_external_lsa *ext, *extnew; | |
1954 | struct external_info ei; | |
1955 | ||
1956 | ext = (struct as_external_lsa *)(type7->data); | |
1957 | ||
1958 | /* need external_info struct, fill in bare minimum */ | |
1959 | ei.p.family = AF_INET; | |
1960 | ei.p.prefix = type7->data->id; | |
1961 | ei.p.prefixlen = ip_masklen(ext->mask); | |
1962 | ei.type = ZEBRA_ROUTE_OSPF; | |
1963 | ei.nexthop = ext->header.adv_router; | |
1964 | ei.route_map_set.metric = -1; | |
1965 | ei.route_map_set.metric_type = -1; | |
1966 | ei.tag = 0; | |
1967 | ei.instance = 0; | |
1968 | ||
1969 | if ((new = ospf_external_lsa_new(ospf, &ei, &type7->data->id)) | |
1970 | == NULL) { | |
1971 | if (IS_DEBUG_OSPF_NSSA) | |
1972 | zlog_debug( | |
1973 | "%s: Could not originate Translated Type-5 for %pI4", | |
1974 | __func__, &ei.p.prefix); | |
1975 | return NULL; | |
1976 | } | |
1977 | ||
1978 | extnew = (struct as_external_lsa *)(new->data); | |
1979 | ||
1980 | /* copy over Type-7 data to new */ | |
1981 | extnew->e[0].tos = ext->e[0].tos; | |
1982 | extnew->e[0].route_tag = ext->e[0].route_tag; | |
1983 | if (type7->area->suppress_fa) { | |
1984 | extnew->e[0].fwd_addr.s_addr = 0; | |
1985 | if (IS_DEBUG_OSPF_NSSA) | |
1986 | zlog_debug("%s: Suppress forwarding address for %pI4", | |
1987 | __func__, &ei.p.prefix); | |
1988 | } else | |
1989 | extnew->e[0].fwd_addr.s_addr = ext->e[0].fwd_addr.s_addr; | |
1990 | new->data->ls_seqnum = type7->data->ls_seqnum; | |
1991 | ||
1992 | /* add translated flag, checksum and lock new lsa */ | |
1993 | SET_FLAG(new->flags, OSPF_LSA_LOCAL_XLT); /* Translated from 7 */ | |
1994 | new = ospf_lsa_lock(new); | |
1995 | ||
1996 | return new; | |
1997 | } | |
1998 | ||
1999 | /* Originate Translated Type-5 for supplied Type-7 NSSA LSA */ | |
2000 | struct ospf_lsa *ospf_translated_nssa_originate(struct ospf *ospf, | |
2001 | struct ospf_lsa *type7, | |
2002 | struct ospf_lsa *type5) | |
2003 | { | |
2004 | struct ospf_lsa *new; | |
2005 | struct as_external_lsa *extnew; | |
2006 | ||
2007 | if (ospf->gr_info.restart_in_progress) { | |
2008 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2009 | zlog_debug( | |
2010 | "LSA[Translated Type5]: Graceful Restart in progress, don't originate"); | |
2011 | return NULL; | |
2012 | } | |
2013 | ||
2014 | /* we cant use ospf_external_lsa_originate() as we need to set | |
2015 | * the OSPF_LSA_LOCAL_XLT flag, must originate by hand | |
2016 | */ | |
2017 | ||
2018 | if ((new = ospf_lsa_translated_nssa_new(ospf, type7)) == NULL) { | |
2019 | if (IS_DEBUG_OSPF_NSSA) | |
2020 | zlog_debug( | |
2021 | "%s: Could not translate Type-7, Id %pI4, to Type-5", | |
2022 | __func__, &type7->data->id); | |
2023 | return NULL; | |
2024 | } | |
2025 | ||
2026 | extnew = (struct as_external_lsa *)new->data; | |
2027 | ||
2028 | /* Update LSA sequence number from translated Type-5 LSA */ | |
2029 | if (type5) | |
2030 | new->data->ls_seqnum = lsa_seqnum_increment(type5); | |
2031 | ||
2032 | if ((new = ospf_lsa_install(ospf, NULL, new)) == NULL) { | |
2033 | flog_warn(EC_OSPF_LSA_INSTALL_FAILURE, | |
2034 | "%s: Could not install LSA id %pI4", __func__, | |
2035 | &type7->data->id); | |
2036 | return NULL; | |
2037 | } | |
2038 | ||
2039 | if (IS_DEBUG_OSPF_NSSA) { | |
2040 | zlog_debug("%s: translated Type 7, installed", __func__); | |
2041 | ospf_lsa_header_dump(new->data); | |
2042 | zlog_debug(" Network mask: %d", ip_masklen(extnew->mask)); | |
2043 | zlog_debug(" Forward addr: %pI4", | |
2044 | &extnew->e[0].fwd_addr); | |
2045 | } | |
2046 | ||
2047 | ospf->lsa_originate_count++; | |
2048 | ospf_flood_through_as(ospf, NULL, new); | |
2049 | ||
2050 | return new; | |
2051 | } | |
2052 | ||
2053 | /* Refresh Translated from NSSA AS-external-LSA. */ | |
2054 | struct ospf_lsa *ospf_translated_nssa_refresh(struct ospf *ospf, | |
2055 | struct ospf_lsa *type7, | |
2056 | struct ospf_lsa *type5) | |
2057 | { | |
2058 | struct ospf_lsa *new = NULL; | |
2059 | struct as_external_lsa *extold = NULL; | |
2060 | uint32_t ls_seqnum = 0; | |
2061 | ||
2062 | /* Sanity checks. */ | |
2063 | assert(type7 || type5); | |
2064 | if (!(type7 || type5)) | |
2065 | return NULL; | |
2066 | if (type7) | |
2067 | assert(type7->data); | |
2068 | if (type5) | |
2069 | assert(type5->data); | |
2070 | assert(ospf->anyNSSA); | |
2071 | ||
2072 | /* get required data according to what has been given */ | |
2073 | if (type7 && type5 == NULL) { | |
2074 | /* find the translated Type-5 for this Type-7 */ | |
2075 | struct as_external_lsa *ext = | |
2076 | (struct as_external_lsa *)(type7->data); | |
2077 | struct prefix_ipv4 p = { | |
2078 | .prefix = type7->data->id, | |
2079 | .prefixlen = ip_masklen(ext->mask), | |
2080 | .family = AF_INET, | |
2081 | }; | |
2082 | ||
2083 | type5 = ospf_external_info_find_lsa(ospf, &p); | |
2084 | } else if (type5 && type7 == NULL) { | |
2085 | /* find the type-7 from which supplied type-5 was translated, | |
2086 | * ie find first type-7 with same LSA Id. | |
2087 | */ | |
2088 | struct listnode *ln, *lnn; | |
2089 | struct route_node *rn; | |
2090 | struct ospf_lsa *lsa; | |
2091 | struct ospf_area *area; | |
2092 | ||
2093 | for (ALL_LIST_ELEMENTS(ospf->areas, ln, lnn, area)) { | |
2094 | if (area->external_routing != OSPF_AREA_NSSA && !type7) | |
2095 | continue; | |
2096 | ||
2097 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) { | |
2098 | if (lsa->data->id.s_addr | |
2099 | == type5->data->id.s_addr) { | |
2100 | type7 = lsa; | |
2101 | break; | |
2102 | } | |
2103 | } | |
2104 | } | |
2105 | } | |
2106 | ||
2107 | /* do we have type7? */ | |
2108 | if (!type7) { | |
2109 | if (IS_DEBUG_OSPF_NSSA) | |
2110 | zlog_debug("%s: no Type-7 found for Type-5 LSA Id %pI4", | |
2111 | __func__, &type5->data->id); | |
2112 | return NULL; | |
2113 | } | |
2114 | ||
2115 | /* do we have valid translated type5? */ | |
2116 | if (type5 == NULL || !CHECK_FLAG(type5->flags, OSPF_LSA_LOCAL_XLT)) { | |
2117 | if (IS_DEBUG_OSPF_NSSA) | |
2118 | zlog_debug( | |
2119 | "%s: No translated Type-5 found for Type-7 with Id %pI4", | |
2120 | __func__, &type7->data->id); | |
2121 | return NULL; | |
2122 | } | |
2123 | ||
2124 | extold = (struct as_external_lsa *)type5->data; | |
2125 | if (type7->area->suppress_fa == 1) { | |
2126 | if (extold->e[0].fwd_addr.s_addr == 0) | |
2127 | ls_seqnum = ntohl(type5->data->ls_seqnum); | |
2128 | } | |
2129 | ||
2130 | /* Delete LSA from neighbor retransmit-list. */ | |
2131 | ospf_ls_retransmit_delete_nbr_as(ospf, type5); | |
2132 | ||
2133 | /* create new translated LSA */ | |
2134 | if ((new = ospf_lsa_translated_nssa_new(ospf, type7)) == NULL) { | |
2135 | if (IS_DEBUG_OSPF_NSSA) | |
2136 | zlog_debug( | |
2137 | "%s: Could not translate Type-7 for %pI4 to Type-5", | |
2138 | __func__, &type7->data->id); | |
2139 | return NULL; | |
2140 | } | |
2141 | ||
2142 | if (type7->area->suppress_fa == 1) { | |
2143 | if (extold->e[0].fwd_addr.s_addr == 0) | |
2144 | new->data->ls_seqnum = htonl(ls_seqnum + 1); | |
2145 | } | |
2146 | ||
2147 | if (!(new = ospf_lsa_install(ospf, NULL, new))) { | |
2148 | flog_warn(EC_OSPF_LSA_INSTALL_FAILURE, | |
2149 | "%s: Could not install translated LSA, Id %pI4", | |
2150 | __func__, &type7->data->id); | |
2151 | return NULL; | |
2152 | } | |
2153 | ||
2154 | /* Flood LSA through area. */ | |
2155 | ospf_flood_through_as(ospf, NULL, new); | |
2156 | ||
2157 | return new; | |
2158 | } | |
2159 | ||
2160 | /* Originate an AS-external-LSA, install and flood. */ | |
2161 | struct ospf_lsa *ospf_external_lsa_originate(struct ospf *ospf, | |
2162 | struct external_info *ei) | |
2163 | { | |
2164 | struct ospf_lsa *new; | |
2165 | ||
2166 | if (ospf->gr_info.restart_in_progress) { | |
2167 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2168 | zlog_debug( | |
2169 | "LSA[Type5]: Graceful Restart in progress, don't originate"); | |
2170 | return NULL; | |
2171 | } | |
2172 | ||
2173 | /* Added for NSSA project.... | |
2174 | ||
2175 | External LSAs are originated in ASBRs as usual, but for NSSA | |
2176 | systems. | |
2177 | there is the global Type-5 LSDB and a Type-7 LSDB installed for | |
2178 | every area. The Type-7's are flooded to every IR and every ABR; We | |
2179 | install the Type-5 LSDB so that the normal "refresh" code operates | |
2180 | as usual, and flag them as not used during ASE calculations. The | |
2181 | Type-7 LSDB is used for calculations. Each Type-7 has a Forwarding | |
2182 | Address of non-zero. | |
2183 | ||
2184 | If an ABR is the elected NSSA translator, following SPF and during | |
2185 | the ABR task it will translate all the scanned Type-7's, with P-bit | |
2186 | ON and not-self generated, and translate to Type-5's throughout the | |
2187 | non-NSSA/STUB AS. | |
2188 | ||
2189 | A difference in operation depends whether this ASBR is an ABR | |
2190 | or not. If not an ABR, the P-bit is ON, to indicate that any | |
2191 | elected NSSA-ABR can perform its translation. | |
2192 | ||
2193 | If an ABR, the P-bit is OFF; No ABR will perform translation and | |
2194 | this ASBR will flood the Type-5 LSA as usual. | |
2195 | ||
2196 | For the case where this ASBR is not an ABR, the ASE calculations | |
2197 | are based on the Type-5 LSDB; The Type-7 LSDB exists just to | |
2198 | demonstrate to the user that there are LSA's that belong to any | |
2199 | attached NSSA. | |
2200 | ||
2201 | Finally, it just so happens that when the ABR is translating every | |
2202 | Type-7 into Type-5, it installs it into the Type-5 LSDB as an | |
2203 | approved Type-5 (translated from Type-7); at the end of translation | |
2204 | if any Translated Type-5's remain unapproved, then they must be | |
2205 | flushed from the AS. | |
2206 | ||
2207 | */ | |
2208 | ||
2209 | if (ospf->router_id.s_addr == INADDR_ANY) { | |
2210 | if (ei && IS_DEBUG_OSPF_EVENT) | |
2211 | zlog_debug( | |
2212 | "LSA[Type5:%pI4]: deferring AS-external-LSA origination, router ID is zero", | |
2213 | &ei->p.prefix); | |
2214 | return NULL; | |
2215 | } | |
2216 | ||
2217 | /* Create new AS-external-LSA instance. */ | |
2218 | if ((new = ospf_external_lsa_new(ospf, ei, NULL)) == NULL) { | |
2219 | if (ei && IS_DEBUG_OSPF_EVENT) | |
2220 | zlog_debug( | |
2221 | "LSA[Type5:%pI4]: Could not originate AS-external-LSA", | |
2222 | &ei->p.prefix); | |
2223 | return NULL; | |
2224 | } | |
2225 | ||
2226 | /* Install newly created LSA into Type-5 LSDB, lock = 1. */ | |
2227 | ospf_lsa_install(ospf, NULL, new); | |
2228 | ||
2229 | /* Update LSA origination count. */ | |
2230 | ospf->lsa_originate_count++; | |
2231 | ||
2232 | /* Flooding new LSA. only to AS (non-NSSA/STUB) */ | |
2233 | ospf_flood_through_as(ospf, NULL, new); | |
2234 | ||
2235 | /* If there is any attached NSSA, do special handling */ | |
2236 | if (ospf->anyNSSA && | |
2237 | /* stay away from translated LSAs! */ | |
2238 | !(CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT))) | |
2239 | ospf_install_flood_nssa( | |
2240 | ospf, new, ei); /* Install/Flood Type-7 to all NSSAs */ | |
2241 | ||
2242 | /* Debug logging. */ | |
2243 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
2244 | zlog_debug("LSA[Type%d:%pI4]: Originate AS-external-LSA %p", | |
2245 | new->data->type, &new->data->id, | |
2246 | (void *)new); | |
2247 | ospf_lsa_header_dump(new->data); | |
2248 | } | |
2249 | ||
2250 | return new; | |
2251 | } | |
2252 | ||
2253 | static struct external_info *ospf_default_external_info(struct ospf *ospf) | |
2254 | { | |
2255 | int type; | |
2256 | struct prefix_ipv4 p; | |
2257 | struct external_info *default_ei; | |
2258 | int ret = 0; | |
2259 | ||
2260 | p.family = AF_INET; | |
2261 | p.prefix.s_addr = 0; | |
2262 | p.prefixlen = 0; | |
2263 | ||
2264 | default_ei = ospf_external_info_lookup(ospf, DEFAULT_ROUTE, 0, &p); | |
2265 | if (!default_ei) | |
2266 | return NULL; | |
2267 | ||
2268 | /* First, lookup redistributed default route. */ | |
2269 | for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) { | |
2270 | struct list *ext_list; | |
2271 | ||
2272 | if (type == ZEBRA_ROUTE_OSPF) | |
2273 | continue; | |
2274 | ||
2275 | ext_list = ospf->external[type]; | |
2276 | if (!ext_list) | |
2277 | continue; | |
2278 | ||
2279 | ret = ospf_external_default_routemap_apply_walk(ospf, ext_list, | |
2280 | default_ei); | |
2281 | if (ret) | |
2282 | return default_ei; | |
2283 | } | |
2284 | ||
2285 | return NULL; | |
2286 | } | |
2287 | ||
2288 | void ospf_external_lsa_rid_change(struct ospf *ospf) | |
2289 | { | |
2290 | struct external_info *ei; | |
2291 | struct ospf_external_aggr_rt *aggr; | |
2292 | struct ospf_lsa *lsa = NULL; | |
2293 | int force; | |
2294 | int type; | |
2295 | ||
2296 | for (type = 0; type < ZEBRA_ROUTE_MAX; type++) { | |
2297 | struct route_node *rn; | |
2298 | struct route_table *rt; | |
2299 | struct list *ext_list; | |
2300 | struct listnode *node; | |
2301 | struct ospf_external *ext; | |
2302 | ||
2303 | ext_list = ospf->external[type]; | |
2304 | if (!ext_list) | |
2305 | continue; | |
2306 | ||
2307 | for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) { | |
2308 | /* Originate As-external-LSA from all type of | |
2309 | * distribute source. | |
2310 | */ | |
2311 | rt = ext->external_info; | |
2312 | if (!rt) | |
2313 | continue; | |
2314 | ||
2315 | for (rn = route_top(rt); rn; rn = route_next(rn)) { | |
2316 | ei = rn->info; | |
2317 | ||
2318 | if (!ei) | |
2319 | continue; | |
2320 | ||
2321 | if (is_default_prefix4(&ei->p)) | |
2322 | continue; | |
2323 | ||
2324 | lsa = ospf_external_info_find_lsa(ospf, &ei->p); | |
2325 | ||
2326 | aggr = ospf_external_aggr_match(ospf, &ei->p); | |
2327 | if (aggr) { | |
2328 | ||
2329 | if (!ospf_redistribute_check(ospf, ei, | |
2330 | NULL)) | |
2331 | continue; | |
2332 | ||
2333 | if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR)) | |
2334 | zlog_debug( | |
2335 | "Originate Summary LSA after reset/router-ID change"); | |
2336 | ||
2337 | /* Here the LSA is originated as new */ | |
2338 | ospf_originate_summary_lsa(ospf, aggr, | |
2339 | ei); | |
2340 | } else if (lsa) { | |
2341 | /* LSA needs to be refreshed even if | |
2342 | * there is no change in the route | |
2343 | * params if the LSA is in maxage. | |
2344 | */ | |
2345 | if (IS_LSA_MAXAGE(lsa)) | |
2346 | force = LSA_REFRESH_FORCE; | |
2347 | else | |
2348 | force = LSA_REFRESH_IF_CHANGED; | |
2349 | ||
2350 | ospf_external_lsa_refresh(ospf, lsa, | |
2351 | ei, force, 0); | |
2352 | } else { | |
2353 | if (!ospf_redistribute_check(ospf, ei, | |
2354 | NULL)) | |
2355 | continue; | |
2356 | ||
2357 | if (!ospf_external_lsa_originate(ospf, | |
2358 | ei)) | |
2359 | flog_warn( | |
2360 | EC_OSPF_LSA_INSTALL_FAILURE, | |
2361 | "LSA: AS-external-LSA was not originated."); | |
2362 | } | |
2363 | } | |
2364 | } | |
2365 | } | |
2366 | ||
2367 | ei = ospf_default_external_info(ospf); | |
2368 | if (ei && !ospf_external_lsa_originate(ospf, ei)) { | |
2369 | flog_warn(EC_OSPF_LSA_INSTALL_FAILURE, | |
2370 | "LSA: AS-external-LSA for default route was not originated."); | |
2371 | } | |
2372 | } | |
2373 | ||
2374 | /* Flush any NSSA LSAs for given prefix */ | |
2375 | void ospf_nssa_lsa_flush(struct ospf *ospf, struct prefix_ipv4 *p) | |
2376 | { | |
2377 | struct listnode *node, *nnode; | |
2378 | struct ospf_lsa *lsa = NULL; | |
2379 | struct ospf_area *area; | |
2380 | ||
2381 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
2382 | if (area->external_routing == OSPF_AREA_NSSA) { | |
2383 | lsa = ospf_lsa_lookup(ospf, area, OSPF_AS_NSSA_LSA, | |
2384 | p->prefix, ospf->router_id); | |
2385 | if (!lsa) { | |
2386 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2387 | zlog_debug( | |
2388 | "LSA: There is no such AS-NSSA-LSA %pFX in LSDB", | |
2389 | p); | |
2390 | continue; | |
2391 | } | |
2392 | ospf_ls_retransmit_delete_nbr_area(area, lsa); | |
2393 | if (!IS_LSA_MAXAGE(lsa)) { | |
2394 | ospf_refresher_unregister_lsa(ospf, lsa); | |
2395 | ospf_lsa_flush_area(lsa, area); | |
2396 | } | |
2397 | } | |
2398 | } | |
2399 | } | |
2400 | ||
2401 | /* Flush an AS-external-LSA from LSDB and routing domain. */ | |
2402 | void ospf_external_lsa_flush(struct ospf *ospf, uint8_t type, | |
2403 | struct prefix_ipv4 *p, | |
2404 | ifindex_t ifindex /*, struct in_addr nexthop */) | |
2405 | { | |
2406 | struct ospf_lsa *lsa; | |
2407 | ||
2408 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2409 | zlog_debug("LSA: Flushing AS-external-LSA %pFX", p); | |
2410 | ||
2411 | /* First lookup LSA from LSDB. */ | |
2412 | if (!(lsa = ospf_external_info_find_lsa(ospf, p))) { | |
2413 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2414 | zlog_debug( | |
2415 | "LSA: There is no such AS-external-LSA %pFX in LSDB", | |
2416 | p); | |
2417 | return; | |
2418 | } | |
2419 | ||
2420 | /* If LSA is selforiginated, not a translated LSA, and there is | |
2421 | * NSSA area, flush Type-7 LSA's at first. | |
2422 | */ | |
2423 | if (IS_LSA_SELF(lsa) && (ospf->anyNSSA) | |
2424 | && !(CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT))) | |
2425 | ospf_nssa_lsa_flush(ospf, p); | |
2426 | ||
2427 | if (!IS_LSA_MAXAGE(lsa)) { | |
2428 | /* Sweep LSA from Link State Retransmit List. */ | |
2429 | ospf_ls_retransmit_delete_nbr_as(ospf, lsa); | |
2430 | ||
2431 | /* Unregister LSA from Refresh queue. */ | |
2432 | ospf_refresher_unregister_lsa(ospf, lsa); | |
2433 | ||
2434 | /* Flush AS-external-LSA through AS. */ | |
2435 | ospf_lsa_flush_as(ospf, lsa); | |
2436 | } | |
2437 | ||
2438 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
2439 | zlog_debug("%s: stop", __func__); | |
2440 | } | |
2441 | ||
2442 | void ospf_external_lsa_refresh_default(struct ospf *ospf) | |
2443 | { | |
2444 | struct prefix_ipv4 p; | |
2445 | struct external_info *ei; | |
2446 | struct ospf_lsa *lsa; | |
2447 | ||
2448 | p.family = AF_INET; | |
2449 | p.prefixlen = 0; | |
2450 | p.prefix.s_addr = INADDR_ANY; | |
2451 | ||
2452 | ei = ospf_default_external_info(ospf); | |
2453 | lsa = ospf_external_info_find_lsa(ospf, &p); | |
2454 | ||
2455 | if (ei && lsa) { | |
2456 | if (IS_DEBUG_OSPF_EVENT) | |
2457 | zlog_debug("LSA[Type5:0.0.0.0]: Refresh AS-external-LSA %p", | |
2458 | (void *)lsa); | |
2459 | ospf_external_lsa_refresh(ospf, lsa, ei, LSA_REFRESH_FORCE, | |
2460 | false); | |
2461 | } else if (ei && !lsa) { | |
2462 | if (IS_DEBUG_OSPF_EVENT) | |
2463 | zlog_debug( | |
2464 | "LSA[Type5:0.0.0.0]: Originate AS-external-LSA"); | |
2465 | ospf_external_lsa_originate(ospf, ei); | |
2466 | } else if (lsa) { | |
2467 | if (IS_DEBUG_OSPF_EVENT) | |
2468 | zlog_debug("LSA[Type5:0.0.0.0]: Flush AS-external-LSA"); | |
2469 | ospf_external_lsa_flush(ospf, DEFAULT_ROUTE, &p, 0); | |
2470 | } | |
2471 | } | |
2472 | ||
2473 | void ospf_external_lsa_refresh_type(struct ospf *ospf, uint8_t type, | |
2474 | unsigned short instance, int force) | |
2475 | { | |
2476 | struct route_node *rn; | |
2477 | struct external_info *ei; | |
2478 | struct ospf_external *ext; | |
2479 | ||
2480 | if (type == DEFAULT_ROUTE) | |
2481 | return; | |
2482 | ||
2483 | ext = ospf_external_lookup(ospf, type, instance); | |
2484 | ||
2485 | if (ext && EXTERNAL_INFO(ext)) { | |
2486 | /* Refresh each redistributed AS-external-LSAs. */ | |
2487 | for (rn = route_top(EXTERNAL_INFO(ext)); rn; | |
2488 | rn = route_next(rn)) { | |
2489 | ei = rn->info; | |
2490 | if (ei) { | |
2491 | if (!is_default_prefix4(&ei->p)) { | |
2492 | struct ospf_lsa *lsa; | |
2493 | struct ospf_external_aggr_rt *aggr; | |
2494 | ||
2495 | aggr = ospf_external_aggr_match(ospf, | |
2496 | &ei->p); | |
2497 | lsa = ospf_external_info_find_lsa( | |
2498 | ospf, &ei->p); | |
2499 | if (aggr) { | |
2500 | /* Check the AS-external-LSA | |
2501 | * should be originated. | |
2502 | */ | |
2503 | if (!ospf_redistribute_check( | |
2504 | ospf, ei, NULL)) { | |
2505 | ||
2506 | ospf_unlink_ei_from_aggr( | |
2507 | ospf, aggr, ei); | |
2508 | continue; | |
2509 | } | |
2510 | ||
2511 | if (IS_DEBUG_OSPF( | |
2512 | lsa, | |
2513 | EXTNL_LSA_AGGR)) | |
2514 | zlog_debug( | |
2515 | "%s: Send Aggreate LSA (%pFX)", | |
2516 | __func__, | |
2517 | &aggr->p); | |
2518 | ||
2519 | ospf_originate_summary_lsa( | |
2520 | ospf, aggr, ei); | |
2521 | ||
2522 | } else if (lsa) { | |
2523 | ||
2524 | if (IS_LSA_MAXAGE(lsa)) | |
2525 | force = LSA_REFRESH_FORCE; | |
2526 | ||
2527 | ospf_external_lsa_refresh( | |
2528 | ospf, lsa, ei, force, | |
2529 | false); | |
2530 | } else { | |
2531 | if (!ospf_redistribute_check( | |
2532 | ospf, ei, NULL)) | |
2533 | continue; | |
2534 | ospf_external_lsa_originate( | |
2535 | ospf, ei); | |
2536 | } | |
2537 | } | |
2538 | } | |
2539 | } | |
2540 | } | |
2541 | } | |
2542 | ||
2543 | /* Refresh AS-external-LSA. */ | |
2544 | struct ospf_lsa *ospf_external_lsa_refresh(struct ospf *ospf, | |
2545 | struct ospf_lsa *lsa, | |
2546 | struct external_info *ei, int force, | |
2547 | bool is_aggr) | |
2548 | { | |
2549 | struct ospf_lsa *new; | |
2550 | int changed = 0; | |
2551 | ||
2552 | /* Check the AS-external-LSA should be originated. */ | |
2553 | if (!is_aggr) | |
2554 | if (!ospf_redistribute_check(ospf, ei, &changed)) { | |
2555 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2556 | zlog_debug( | |
2557 | "LSA[Type%d:%pI4] Could not be refreshed, redist check fail", | |
2558 | lsa->data->type, | |
2559 | &lsa->data->id); | |
2560 | ||
2561 | ospf_external_lsa_flush(ospf, ei->type, &ei->p, | |
2562 | ei->ifindex /*, ei->nexthop */); | |
2563 | return NULL; | |
2564 | } | |
2565 | ||
2566 | if (!changed && !force) { | |
2567 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2568 | zlog_debug( | |
2569 | "LSA[Type%d:%pI4]: Not refreshed, not changed/forced", | |
2570 | lsa->data->type, &lsa->data->id); | |
2571 | return NULL; | |
2572 | } | |
2573 | ||
2574 | /* Delete LSA from neighbor retransmit-list. */ | |
2575 | ospf_ls_retransmit_delete_nbr_as(ospf, lsa); | |
2576 | ||
2577 | /* Unregister AS-external-LSA from refresh-list. */ | |
2578 | ospf_refresher_unregister_lsa(ospf, lsa); | |
2579 | ||
2580 | new = ospf_external_lsa_new(ospf, ei, &lsa->data->id); | |
2581 | ||
2582 | if (new == NULL) { | |
2583 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
2584 | zlog_debug("LSA[Type%d:%pI4]: Could not be refreshed", | |
2585 | lsa->data->type, &lsa->data->id); | |
2586 | return NULL; | |
2587 | } | |
2588 | ||
2589 | new->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
2590 | ||
2591 | ospf_lsa_install(ospf, NULL, new); /* As type-5. */ | |
2592 | ||
2593 | /* Flood LSA through AS. */ | |
2594 | ospf_flood_through_as(ospf, NULL, new); | |
2595 | ||
2596 | /* If any attached NSSA, install as Type-7, flood to all NSSA Areas */ | |
2597 | if (ospf->anyNSSA && !(CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT))) | |
2598 | ospf_install_flood_nssa(ospf, new, | |
2599 | ei); /* Install/Flood per new rules */ | |
2600 | ||
2601 | /* Register self-originated LSA to refresh queue. | |
2602 | * Translated LSAs should not be registered, but refreshed upon | |
2603 | * refresh of the Type-7 | |
2604 | */ | |
2605 | if (!CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT)) | |
2606 | ospf_refresher_register_lsa(ospf, new); | |
2607 | ||
2608 | /* Debug logging. */ | |
2609 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
2610 | zlog_debug("LSA[Type%d:%pI4]: AS-external-LSA refresh", | |
2611 | new->data->type, &new->data->id); | |
2612 | ospf_lsa_header_dump(new->data); | |
2613 | } | |
2614 | ||
2615 | return new; | |
2616 | } | |
2617 | ||
2618 | ||
2619 | /* LSA installation functions. */ | |
2620 | ||
2621 | /* Install router-LSA to an area. */ | |
2622 | static struct ospf_lsa * | |
2623 | ospf_router_lsa_install(struct ospf *ospf, struct ospf_lsa *new, int rt_recalc) | |
2624 | { | |
2625 | struct ospf_area *area = new->area; | |
2626 | ||
2627 | /* RFC 2328 Section 13.2 Router-LSAs and network-LSAs | |
2628 | The entire routing table must be recalculated, starting with | |
2629 | the shortest path calculations for each area (not just the | |
2630 | area whose link-state database has changed). | |
2631 | */ | |
2632 | ||
2633 | if (IS_LSA_SELF(new)) { | |
2634 | ||
2635 | /* Only install LSA if it is originated/refreshed by us. | |
2636 | * If LSA was received by flooding, the RECEIVED flag is set so | |
2637 | * do | |
2638 | * not link the LSA */ | |
2639 | if (CHECK_FLAG(new->flags, OSPF_LSA_RECEIVED)) | |
2640 | return new; /* ignore stale LSA */ | |
2641 | ||
2642 | /* Set self-originated router-LSA. */ | |
2643 | ospf_lsa_unlock(&area->router_lsa_self); | |
2644 | area->router_lsa_self = ospf_lsa_lock(new); | |
2645 | ||
2646 | ospf_refresher_register_lsa(ospf, new); | |
2647 | } | |
2648 | /* For BGP ORR SPF should be calculated from specified root(s) */ | |
2649 | else if (ospf->orr_spf_request) { | |
2650 | ospf_lsa_unlock(&area->router_lsa_rcvd); | |
2651 | area->router_lsa_rcvd = ospf_lsa_lock(new); | |
2652 | ospf_orr_root_update_rcvd_lsa(area->router_lsa_rcvd); | |
2653 | } | |
2654 | ||
2655 | if (rt_recalc) | |
2656 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_ROUTER_LSA_INSTALL); | |
2657 | return new; | |
2658 | } | |
2659 | ||
2660 | /* Install network-LSA to an area. */ | |
2661 | static struct ospf_lsa *ospf_network_lsa_install(struct ospf *ospf, | |
2662 | struct ospf_interface *oi, | |
2663 | struct ospf_lsa *new, | |
2664 | int rt_recalc) | |
2665 | { | |
2666 | /* RFC 2328 Section 13.2 Router-LSAs and network-LSAs | |
2667 | The entire routing table must be recalculated, starting with | |
2668 | the shortest path calculations for each area (not just the | |
2669 | area whose link-state database has changed). | |
2670 | */ | |
2671 | if (IS_LSA_SELF(new)) { | |
2672 | /* We supposed that when LSA is originated by us, we pass the | |
2673 | int | |
2674 | for which it was originated. If LSA was received by flooding, | |
2675 | the RECEIVED flag is set, so we do not link the LSA to the | |
2676 | int. */ | |
2677 | if (CHECK_FLAG(new->flags, OSPF_LSA_RECEIVED)) | |
2678 | return new; /* ignore stale LSA */ | |
2679 | ||
2680 | ospf_lsa_unlock(&oi->network_lsa_self); | |
2681 | oi->network_lsa_self = ospf_lsa_lock(new); | |
2682 | ospf_refresher_register_lsa(ospf, new); | |
2683 | } | |
2684 | if (rt_recalc) | |
2685 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_NETWORK_LSA_INSTALL); | |
2686 | ||
2687 | return new; | |
2688 | } | |
2689 | ||
2690 | /* Install summary-LSA to an area. */ | |
2691 | static struct ospf_lsa * | |
2692 | ospf_summary_lsa_install(struct ospf *ospf, struct ospf_lsa *new, int rt_recalc) | |
2693 | { | |
2694 | if (rt_recalc && !IS_LSA_SELF(new)) { | |
2695 | /* RFC 2328 Section 13.2 Summary-LSAs | |
2696 | The best route to the destination described by the summary- | |
2697 | LSA must be recalculated (see Section 16.5). If this | |
2698 | destination is an AS boundary router, it may also be | |
2699 | necessary to re-examine all the AS-external-LSAs. | |
2700 | */ | |
2701 | ||
2702 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_SUMMARY_LSA_INSTALL); | |
2703 | } | |
2704 | ||
2705 | if (IS_LSA_SELF(new)) | |
2706 | ospf_refresher_register_lsa(ospf, new); | |
2707 | ||
2708 | return new; | |
2709 | } | |
2710 | ||
2711 | /* Install ASBR-summary-LSA to an area. */ | |
2712 | static struct ospf_lsa *ospf_summary_asbr_lsa_install(struct ospf *ospf, | |
2713 | struct ospf_lsa *new, | |
2714 | int rt_recalc) | |
2715 | { | |
2716 | if (rt_recalc && !IS_LSA_SELF(new)) { | |
2717 | /* RFC 2328 Section 13.2 Summary-LSAs | |
2718 | The best route to the destination described by the summary- | |
2719 | LSA must be recalculated (see Section 16.5). If this | |
2720 | destination is an AS boundary router, it may also be | |
2721 | necessary to re-examine all the AS-external-LSAs. | |
2722 | */ | |
2723 | ospf_spf_calculate_schedule(ospf, | |
2724 | SPF_FLAG_ASBR_SUMMARY_LSA_INSTALL); | |
2725 | } | |
2726 | ||
2727 | /* register LSA to refresh-list. */ | |
2728 | if (IS_LSA_SELF(new)) | |
2729 | ospf_refresher_register_lsa(ospf, new); | |
2730 | ||
2731 | return new; | |
2732 | } | |
2733 | ||
2734 | /* Install AS-external-LSA. */ | |
2735 | static struct ospf_lsa *ospf_external_lsa_install(struct ospf *ospf, | |
2736 | struct ospf_lsa *new, | |
2737 | int rt_recalc) | |
2738 | { | |
2739 | ospf_ase_register_external_lsa(new, ospf); | |
2740 | /* If LSA is not self-originated, calculate an external route. */ | |
2741 | if (rt_recalc) { | |
2742 | /* RFC 2328 Section 13.2 AS-external-LSAs | |
2743 | The best route to the destination described by the AS- | |
2744 | external-LSA must be recalculated (see Section 16.6). | |
2745 | */ | |
2746 | ||
2747 | if (!IS_LSA_SELF(new)) | |
2748 | ospf_ase_incremental_update(ospf, new); | |
2749 | } | |
2750 | ||
2751 | if (new->data->type == OSPF_AS_NSSA_LSA) { | |
2752 | /* There is no point to register selforiginate Type-7 LSA for | |
2753 | * refreshing. We rely on refreshing Type-5 LSA's | |
2754 | */ | |
2755 | if (IS_LSA_SELF(new)) | |
2756 | return new; | |
2757 | else { | |
2758 | /* Try refresh type-5 translated LSA for this LSA, if | |
2759 | * one exists. | |
2760 | * New translations will be taken care of by the | |
2761 | * abr_task. | |
2762 | */ | |
2763 | ospf_translated_nssa_refresh(ospf, new, NULL); | |
2764 | ospf_schedule_abr_task(ospf); | |
2765 | } | |
2766 | } | |
2767 | ||
2768 | /* Register self-originated LSA to refresh queue. | |
2769 | * Leave Translated LSAs alone if NSSA is enabled | |
2770 | */ | |
2771 | if (IS_LSA_SELF(new) && !CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT)) | |
2772 | ospf_refresher_register_lsa(ospf, new); | |
2773 | ||
2774 | return new; | |
2775 | } | |
2776 | ||
2777 | void ospf_discard_from_db(struct ospf *ospf, struct ospf_lsdb *lsdb, | |
2778 | struct ospf_lsa *lsa) | |
2779 | { | |
2780 | struct ospf_lsa *old; | |
2781 | ||
2782 | if (!lsdb) | |
2783 | return; | |
2784 | ||
2785 | old = ospf_lsdb_lookup(lsdb, lsa); | |
2786 | ||
2787 | if (!old) | |
2788 | return; | |
2789 | ||
2790 | if (old->refresh_list >= 0) | |
2791 | ospf_refresher_unregister_lsa(ospf, old); | |
2792 | ||
2793 | switch (old->data->type) { | |
2794 | case OSPF_AS_EXTERNAL_LSA: | |
2795 | ospf_ase_unregister_external_lsa(old, ospf); | |
2796 | ospf_ls_retransmit_delete_nbr_as(ospf, old); | |
2797 | break; | |
2798 | case OSPF_OPAQUE_AS_LSA: | |
2799 | ospf_ls_retransmit_delete_nbr_as(ospf, old); | |
2800 | break; | |
2801 | case OSPF_AS_NSSA_LSA: | |
2802 | ospf_ls_retransmit_delete_nbr_area(old->area, old); | |
2803 | ospf_ase_unregister_external_lsa(old, ospf); | |
2804 | break; | |
2805 | default: | |
2806 | ospf_ls_retransmit_delete_nbr_area(old->area, old); | |
2807 | break; | |
2808 | } | |
2809 | ||
2810 | ospf_lsa_maxage_delete(ospf, old); | |
2811 | ospf_lsa_discard(old); | |
2812 | } | |
2813 | ||
2814 | struct ospf_lsa *ospf_lsa_install(struct ospf *ospf, struct ospf_interface *oi, | |
2815 | struct ospf_lsa *lsa) | |
2816 | { | |
2817 | struct ospf_lsa *new = NULL; | |
2818 | struct ospf_lsa *old = NULL; | |
2819 | struct ospf_lsdb *lsdb = NULL; | |
2820 | int rt_recalc; | |
2821 | ||
2822 | /* Set LSDB. */ | |
2823 | switch (lsa->data->type) { | |
2824 | /* kevinm */ | |
2825 | case OSPF_AS_NSSA_LSA: | |
2826 | if (lsa->area) | |
2827 | lsdb = lsa->area->lsdb; | |
2828 | else | |
2829 | lsdb = ospf->lsdb; | |
2830 | break; | |
2831 | case OSPF_AS_EXTERNAL_LSA: | |
2832 | case OSPF_OPAQUE_AS_LSA: | |
2833 | lsdb = ospf->lsdb; | |
2834 | break; | |
2835 | default: | |
2836 | if (lsa->area) | |
2837 | lsdb = lsa->area->lsdb; | |
2838 | break; | |
2839 | } | |
2840 | ||
2841 | assert(lsdb); | |
2842 | ||
2843 | /* RFC 2328 13.2. Installing LSAs in the database | |
2844 | ||
2845 | Installing a new LSA in the database, either as the result of | |
2846 | flooding or a newly self-originated LSA, may cause the OSPF | |
2847 | routing table structure to be recalculated. The contents of the | |
2848 | new LSA should be compared to the old instance, if present. If | |
2849 | there is no difference, there is no need to recalculate the | |
2850 | routing table. When comparing an LSA to its previous instance, | |
2851 | the following are all considered to be differences in contents: | |
2852 | ||
2853 | o The LSA's Options field has changed. | |
2854 | ||
2855 | o One of the LSA instances has LS age set to MaxAge, and | |
2856 | the other does not. | |
2857 | ||
2858 | o The length field in the LSA header has changed. | |
2859 | ||
2860 | o The body of the LSA (i.e., anything outside the 20-byte | |
2861 | LSA header) has changed. Note that this excludes changes | |
2862 | in LS Sequence Number and LS Checksum. | |
2863 | ||
2864 | */ | |
2865 | /* Look up old LSA and determine if any SPF calculation or incremental | |
2866 | update is needed */ | |
2867 | old = ospf_lsdb_lookup(lsdb, lsa); | |
2868 | ||
2869 | /* Do comparison and record if recalc needed. */ | |
2870 | rt_recalc = 0; | |
2871 | if (old == NULL || ospf_lsa_different(old, lsa, false)) { | |
2872 | /* Ref rfc3623 section 3.2.3 | |
2873 | * Installing new lsa or change in the existing LSA | |
2874 | * or flushing existing LSA leads to topo change | |
2875 | * and trigger SPF caculation. | |
2876 | * So, router should be aborted from HELPER role | |
2877 | * if it is detected as TOPO change. | |
2878 | */ | |
2879 | if (ospf->active_restarter_cnt && | |
2880 | CHECK_LSA_TYPE_1_TO_5_OR_7(lsa->data->type)) { | |
2881 | if (old == NULL || ospf_lsa_different(old, lsa, true)) | |
2882 | ospf_helper_handle_topo_chg(ospf, lsa); | |
2883 | } | |
2884 | ||
2885 | rt_recalc = 1; | |
2886 | } | |
2887 | ||
2888 | /* | |
2889 | Sequence number check (Section 14.1 of rfc 2328) | |
2890 | "Premature aging is used when it is time for a self-originated | |
2891 | LSA's sequence number field to wrap. At this point, the current | |
2892 | LSA instance (having LS sequence number MaxSequenceNumber) must | |
2893 | be prematurely aged and flushed from the routing domain before a | |
2894 | new instance with sequence number equal to InitialSequenceNumber | |
2895 | can be originated. " | |
2896 | */ | |
2897 | ||
2898 | if (ntohl(lsa->data->ls_seqnum) - 1 == OSPF_MAX_SEQUENCE_NUMBER) { | |
2899 | if (ospf_lsa_is_self_originated(ospf, lsa)) { | |
2900 | lsa->data->ls_seqnum = htonl(OSPF_MAX_SEQUENCE_NUMBER); | |
2901 | ||
2902 | if (!IS_LSA_MAXAGE(lsa)) | |
2903 | lsa->flags |= OSPF_LSA_PREMATURE_AGE; | |
2904 | lsa->data->ls_age = htons(OSPF_LSA_MAXAGE); | |
2905 | ||
2906 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) { | |
2907 | zlog_debug( | |
2908 | "%s() Premature Aging lsa %p, seqnum 0x%x", | |
2909 | __func__, lsa, | |
2910 | ntohl(lsa->data->ls_seqnum)); | |
2911 | ospf_lsa_header_dump(lsa->data); | |
2912 | } | |
2913 | } else { | |
2914 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
2915 | zlog_debug( | |
2916 | "%s() got an lsa with seq 0x80000000 that was not self originated. Ignoring", | |
2917 | __func__); | |
2918 | ospf_lsa_header_dump(lsa->data); | |
2919 | } | |
2920 | return old; | |
2921 | } | |
2922 | } | |
2923 | ||
2924 | /* discard old LSA from LSDB */ | |
2925 | if (old != NULL) | |
2926 | ospf_discard_from_db(ospf, lsdb, lsa); | |
2927 | ||
2928 | /* Calculate Checksum if self-originated?. */ | |
2929 | if (IS_LSA_SELF(lsa)) | |
2930 | ospf_lsa_checksum(lsa->data); | |
2931 | ||
2932 | /* Insert LSA to LSDB. */ | |
2933 | ospf_lsdb_add(lsdb, lsa); | |
2934 | lsa->lsdb = lsdb; | |
2935 | ||
2936 | /* Do LSA specific installation process. */ | |
2937 | switch (lsa->data->type) { | |
2938 | case OSPF_ROUTER_LSA: | |
2939 | new = ospf_router_lsa_install(ospf, lsa, rt_recalc); | |
2940 | break; | |
2941 | case OSPF_NETWORK_LSA: | |
2942 | assert(oi); | |
2943 | new = ospf_network_lsa_install(ospf, oi, lsa, rt_recalc); | |
2944 | break; | |
2945 | case OSPF_SUMMARY_LSA: | |
2946 | new = ospf_summary_lsa_install(ospf, lsa, rt_recalc); | |
2947 | break; | |
2948 | case OSPF_ASBR_SUMMARY_LSA: | |
2949 | new = ospf_summary_asbr_lsa_install(ospf, lsa, rt_recalc); | |
2950 | break; | |
2951 | case OSPF_AS_EXTERNAL_LSA: | |
2952 | new = ospf_external_lsa_install(ospf, lsa, rt_recalc); | |
2953 | break; | |
2954 | case OSPF_OPAQUE_LINK_LSA: | |
2955 | if (IS_LSA_SELF(lsa)) | |
2956 | lsa->oi = oi; /* Specify outgoing ospf-interface for | |
2957 | this LSA. */ | |
2958 | else { | |
2959 | /* Incoming "oi" for this LSA has set at LSUpd | |
2960 | * reception. */ | |
2961 | } | |
2962 | /* Fallthrough */ | |
2963 | case OSPF_OPAQUE_AREA_LSA: | |
2964 | case OSPF_OPAQUE_AS_LSA: | |
2965 | new = ospf_opaque_lsa_install(lsa, rt_recalc); | |
2966 | break; | |
2967 | case OSPF_AS_NSSA_LSA: | |
2968 | new = ospf_external_lsa_install(ospf, lsa, rt_recalc); | |
2969 | default: /* type-6,8,9....nothing special */ | |
2970 | break; | |
2971 | } | |
2972 | ||
2973 | if (new == NULL) | |
2974 | return new; /* Installation failed, cannot proceed further -- | |
2975 | endo. */ | |
2976 | ||
2977 | /* Debug logs. */ | |
2978 | if (IS_DEBUG_OSPF(lsa, LSA_INSTALL)) { | |
2979 | switch (lsa->data->type) { | |
2980 | case OSPF_AS_EXTERNAL_LSA: | |
2981 | case OSPF_OPAQUE_AS_LSA: | |
2982 | case OSPF_AS_NSSA_LSA: | |
2983 | zlog_debug("LSA[%s]: Install %s", dump_lsa_key(new), | |
2984 | lookup_msg(ospf_lsa_type_msg, | |
2985 | new->data->type, NULL)); | |
2986 | break; | |
2987 | default: | |
2988 | zlog_debug("LSA[%s]: Install %s to Area %pI4", | |
2989 | dump_lsa_key(new), | |
2990 | lookup_msg(ospf_lsa_type_msg, | |
2991 | new->data->type, NULL), | |
2992 | &new->area->area_id); | |
2993 | break; | |
2994 | } | |
2995 | } | |
2996 | ||
2997 | /* | |
2998 | If received LSA' ls_age is MaxAge, or lsa is being prematurely aged | |
2999 | (it's getting flushed out of the area), set LSA on MaxAge LSA list. | |
3000 | */ | |
3001 | if (IS_LSA_MAXAGE(new)) { | |
3002 | if (IS_DEBUG_OSPF(lsa, LSA_INSTALL)) | |
3003 | zlog_debug("LSA[%s]: Install LSA %p, MaxAge", | |
3004 | dump_lsa_key(new), lsa); | |
3005 | ospf_lsa_maxage(ospf, lsa); | |
3006 | } | |
3007 | ||
3008 | return new; | |
3009 | } | |
3010 | ||
3011 | ||
3012 | int ospf_check_nbr_status(struct ospf *ospf) | |
3013 | { | |
3014 | struct listnode *node, *nnode; | |
3015 | struct ospf_interface *oi; | |
3016 | ||
3017 | for (ALL_LIST_ELEMENTS(ospf->oiflist, node, nnode, oi)) { | |
3018 | struct route_node *rn; | |
3019 | struct ospf_neighbor *nbr; | |
3020 | ||
3021 | if (ospf_if_is_enable(oi)) | |
3022 | for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) | |
3023 | if ((nbr = rn->info) != NULL) | |
3024 | if (nbr->state == NSM_Exchange | |
3025 | || nbr->state == NSM_Loading) { | |
3026 | route_unlock_node(rn); | |
3027 | return 0; | |
3028 | } | |
3029 | } | |
3030 | ||
3031 | return 1; | |
3032 | } | |
3033 | ||
3034 | ||
3035 | void ospf_maxage_lsa_remover(struct thread *thread) | |
3036 | { | |
3037 | struct ospf *ospf = THREAD_ARG(thread); | |
3038 | struct ospf_lsa *lsa, *old; | |
3039 | struct route_node *rn; | |
3040 | int reschedule = 0; | |
3041 | ||
3042 | ospf->t_maxage = NULL; | |
3043 | ||
3044 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3045 | zlog_debug("LSA[MaxAge]: remover Start"); | |
3046 | ||
3047 | reschedule = !ospf_check_nbr_status(ospf); | |
3048 | ||
3049 | if (!reschedule) | |
3050 | for (rn = route_top(ospf->maxage_lsa); rn; | |
3051 | rn = route_next(rn)) { | |
3052 | if ((lsa = rn->info) == NULL) { | |
3053 | continue; | |
3054 | } | |
3055 | ||
3056 | /* There is at least one neighbor from which we still | |
3057 | * await an ack | |
3058 | * for that LSA, so we are not allowed to remove it from | |
3059 | * our lsdb yet | |
3060 | * as per RFC 2328 section 14 para 4 a) */ | |
3061 | if (lsa->retransmit_counter > 0) { | |
3062 | reschedule = 1; | |
3063 | continue; | |
3064 | } | |
3065 | ||
3066 | /* TODO: maybe convert this function to a work-queue */ | |
3067 | if (thread_should_yield(thread)) { | |
3068 | OSPF_TIMER_ON(ospf->t_maxage, | |
3069 | ospf_maxage_lsa_remover, 0); | |
3070 | route_unlock_node( | |
3071 | rn); /* route_top/route_next */ | |
3072 | return; | |
3073 | } | |
3074 | ||
3075 | /* Remove LSA from the LSDB */ | |
3076 | if (IS_LSA_SELF(lsa)) | |
3077 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3078 | zlog_debug( | |
3079 | "LSA[Type%d:%pI4]: LSA 0x%lx is self-originated: ", | |
3080 | lsa->data->type, | |
3081 | &lsa->data->id, | |
3082 | (unsigned long)lsa); | |
3083 | ||
3084 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3085 | zlog_debug( | |
3086 | "LSA[%s]: MaxAge LSA removed from list", | |
3087 | dump_lsa_key(lsa)); | |
3088 | ||
3089 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_PREMATURE_AGE)) { | |
3090 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3091 | zlog_debug( | |
3092 | "originating new lsa for lsa %p", | |
3093 | lsa); | |
3094 | ospf_lsa_refresh(ospf, lsa); | |
3095 | } | |
3096 | ||
3097 | /* Remove from lsdb. */ | |
3098 | if (lsa->lsdb) { | |
3099 | old = ospf_lsdb_lookup(lsa->lsdb, lsa); | |
3100 | /* The max age LSA here must be the same | |
3101 | * as the LSA in LSDB | |
3102 | */ | |
3103 | if (old != lsa) { | |
3104 | flog_err(EC_OSPF_LSA_MISSING, | |
3105 | "%s: LSA[%s]: LSA not in LSDB", | |
3106 | __func__, dump_lsa_key(lsa)); | |
3107 | ||
3108 | continue; | |
3109 | } | |
3110 | ospf_discard_from_db(ospf, lsa->lsdb, lsa); | |
3111 | ospf_lsdb_delete(lsa->lsdb, lsa); | |
3112 | } else { | |
3113 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3114 | zlog_debug( | |
3115 | "%s: LSA[%s]: No associated LSDB!", | |
3116 | __func__, dump_lsa_key(lsa)); | |
3117 | } | |
3118 | } | |
3119 | ||
3120 | /* A MaxAge LSA must be removed immediately from the router's link | |
3121 | state database as soon as both a) it is no longer contained on any | |
3122 | neighbor Link state retransmission lists and b) none of the | |
3123 | router's | |
3124 | neighbors are in states Exchange or Loading. */ | |
3125 | if (reschedule) | |
3126 | OSPF_TIMER_ON(ospf->t_maxage, ospf_maxage_lsa_remover, | |
3127 | ospf->maxage_delay); | |
3128 | } | |
3129 | ||
3130 | /* This function checks whether an LSA with initial sequence number should be | |
3131 | * originated after a wrap in sequence number | |
3132 | */ | |
3133 | void ospf_check_and_gen_init_seq_lsa(struct ospf_interface *oi, | |
3134 | struct ospf_lsa *recv_lsa) | |
3135 | { | |
3136 | struct ospf_lsa *lsa = NULL; | |
3137 | struct ospf *ospf = oi->ospf; | |
3138 | ||
3139 | lsa = ospf_lsa_lookup_by_header(oi->area, recv_lsa->data); | |
3140 | ||
3141 | if ((lsa == NULL) || (!CHECK_FLAG(lsa->flags, OSPF_LSA_PREMATURE_AGE)) | |
3142 | || (lsa->retransmit_counter != 0)) { | |
3143 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
3144 | zlog_debug( | |
3145 | "Do not generate LSA with initial seqence number."); | |
3146 | return; | |
3147 | } | |
3148 | ||
3149 | ospf_lsa_maxage_delete(ospf, lsa); | |
3150 | ||
3151 | lsa->data->ls_seqnum = lsa_seqnum_increment(lsa); | |
3152 | ||
3153 | ospf_lsa_refresh(ospf, lsa); | |
3154 | } | |
3155 | ||
3156 | void ospf_lsa_maxage_delete(struct ospf *ospf, struct ospf_lsa *lsa) | |
3157 | { | |
3158 | struct route_node *rn; | |
3159 | struct prefix lsa_prefix; | |
3160 | ||
3161 | memset(&lsa_prefix, 0, sizeof(lsa_prefix)); | |
3162 | lsa_prefix.family = AF_UNSPEC; | |
3163 | lsa_prefix.prefixlen = sizeof(lsa_prefix.u.ptr) * CHAR_BIT; | |
3164 | lsa_prefix.u.ptr = (uintptr_t)lsa; | |
3165 | ||
3166 | if ((rn = route_node_lookup(ospf->maxage_lsa, &lsa_prefix))) { | |
3167 | if (rn->info == lsa) { | |
3168 | UNSET_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE); | |
3169 | ospf_lsa_unlock(&lsa); /* maxage_lsa */ | |
3170 | rn->info = NULL; | |
3171 | route_unlock_node( | |
3172 | rn); /* unlock node because lsa is deleted */ | |
3173 | } | |
3174 | route_unlock_node(rn); /* route_node_lookup */ | |
3175 | } else { | |
3176 | if (IS_DEBUG_OSPF_EVENT) | |
3177 | zlog_debug("%s: lsa %s is not found in maxage db.", | |
3178 | __func__, dump_lsa_key(lsa)); | |
3179 | } | |
3180 | } | |
3181 | ||
3182 | /* Add LSA onto the MaxAge list, and schedule for removal. | |
3183 | * This does *not* lead to the LSA being flooded, that must be taken | |
3184 | * care of elsewhere, see, e.g., ospf_lsa_flush* (which are callers of this | |
3185 | * function). | |
3186 | */ | |
3187 | void ospf_lsa_maxage(struct ospf *ospf, struct ospf_lsa *lsa) | |
3188 | { | |
3189 | struct prefix lsa_prefix; | |
3190 | struct route_node *rn; | |
3191 | ||
3192 | /* When we saw a MaxAge LSA flooded to us, we put it on the list | |
3193 | and schedule the MaxAge LSA remover. */ | |
3194 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE)) { | |
3195 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3196 | zlog_debug( | |
3197 | "LSA[%s]: %p already exists on MaxAge LSA list", | |
3198 | dump_lsa_key(lsa), lsa); | |
3199 | return; | |
3200 | } | |
3201 | ||
3202 | memset(&lsa_prefix, 0, sizeof(lsa_prefix)); | |
3203 | lsa_prefix.family = AF_UNSPEC; | |
3204 | lsa_prefix.prefixlen = sizeof(lsa_prefix.u.ptr) * CHAR_BIT; | |
3205 | lsa_prefix.u.ptr = (uintptr_t)lsa; | |
3206 | ||
3207 | rn = route_node_get(ospf->maxage_lsa, &lsa_prefix); | |
3208 | if (rn->info != NULL) { | |
3209 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3210 | zlog_debug( | |
3211 | "LSA[%s]: found LSA (%p) in table for LSA %p %d", | |
3212 | dump_lsa_key(lsa), rn->info, | |
3213 | (void *)lsa, lsa_prefix.prefixlen); | |
3214 | route_unlock_node(rn); | |
3215 | } else { | |
3216 | rn->info = ospf_lsa_lock(lsa); | |
3217 | SET_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE); | |
3218 | } | |
3219 | ||
3220 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3221 | zlog_debug("LSA[%s]: MaxAge LSA remover scheduled.", | |
3222 | dump_lsa_key(lsa)); | |
3223 | ||
3224 | OSPF_TIMER_ON(ospf->t_maxage, ospf_maxage_lsa_remover, | |
3225 | ospf->maxage_delay); | |
3226 | } | |
3227 | ||
3228 | static int ospf_lsa_maxage_walker_remover(struct ospf *ospf, | |
3229 | struct ospf_lsa *lsa) | |
3230 | { | |
3231 | /* Stay away from any Local Translated Type-7 LSAs */ | |
3232 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
3233 | return 0; | |
3234 | ||
3235 | if (IS_LSA_MAXAGE(lsa)) | |
3236 | /* Self-originated LSAs should NOT time-out instead, | |
3237 | they're flushed and submitted to the max_age list explicitly. | |
3238 | */ | |
3239 | if (!ospf_lsa_is_self_originated(ospf, lsa)) { | |
3240 | if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) | |
3241 | zlog_debug("LSA[%s]: is MaxAge", | |
3242 | dump_lsa_key(lsa)); | |
3243 | ||
3244 | switch (lsa->data->type) { | |
3245 | case OSPF_OPAQUE_LINK_LSA: | |
3246 | case OSPF_OPAQUE_AREA_LSA: | |
3247 | case OSPF_OPAQUE_AS_LSA: | |
3248 | /* | |
3249 | * As a general rule, whenever network topology | |
3250 | * has changed | |
3251 | * (due to an LSA removal in this case), routing | |
3252 | * recalculation | |
3253 | * should be triggered. However, this is not | |
3254 | * true for opaque | |
3255 | * LSAs. Even if an opaque LSA instance is going | |
3256 | * to be removed | |
3257 | * from the routing domain, it does not mean a | |
3258 | * change in network | |
3259 | * topology, and thus, routing recalculation is | |
3260 | * not needed here. | |
3261 | */ | |
3262 | break; | |
3263 | case OSPF_AS_EXTERNAL_LSA: | |
3264 | case OSPF_AS_NSSA_LSA: | |
3265 | ospf_ase_incremental_update(ospf, lsa); | |
3266 | break; | |
3267 | default: | |
3268 | ospf_spf_calculate_schedule(ospf, | |
3269 | SPF_FLAG_MAXAGE); | |
3270 | break; | |
3271 | } | |
3272 | ospf_lsa_maxage(ospf, lsa); | |
3273 | } | |
3274 | ||
3275 | if (IS_LSA_MAXAGE(lsa) && !ospf_lsa_is_self_originated(ospf, lsa)) | |
3276 | if (LS_AGE(lsa) > OSPF_LSA_MAXAGE + 30) | |
3277 | printf("Eek! Shouldn't happen!\n"); | |
3278 | ||
3279 | return 0; | |
3280 | } | |
3281 | ||
3282 | /* Periodical check of MaxAge LSA. */ | |
3283 | void ospf_lsa_maxage_walker(struct thread *thread) | |
3284 | { | |
3285 | struct ospf *ospf = THREAD_ARG(thread); | |
3286 | struct route_node *rn; | |
3287 | struct ospf_lsa *lsa; | |
3288 | struct ospf_area *area; | |
3289 | struct listnode *node, *nnode; | |
3290 | ||
3291 | ospf->t_maxage_walker = NULL; | |
3292 | ||
3293 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
3294 | LSDB_LOOP (ROUTER_LSDB(area), rn, lsa) | |
3295 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3296 | LSDB_LOOP (NETWORK_LSDB(area), rn, lsa) | |
3297 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3298 | LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa) | |
3299 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3300 | LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa) | |
3301 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3302 | LSDB_LOOP (OPAQUE_AREA_LSDB(area), rn, lsa) | |
3303 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3304 | LSDB_LOOP (OPAQUE_LINK_LSDB(area), rn, lsa) | |
3305 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3306 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) | |
3307 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3308 | } | |
3309 | ||
3310 | /* for AS-external-LSAs. */ | |
3311 | if (ospf->lsdb) { | |
3312 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) | |
3313 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3314 | LSDB_LOOP (OPAQUE_AS_LSDB(ospf), rn, lsa) | |
3315 | ospf_lsa_maxage_walker_remover(ospf, lsa); | |
3316 | } | |
3317 | ||
3318 | OSPF_TIMER_ON(ospf->t_maxage_walker, ospf_lsa_maxage_walker, | |
3319 | OSPF_LSA_MAXAGE_CHECK_INTERVAL); | |
3320 | } | |
3321 | ||
3322 | struct ospf_lsa *ospf_lsa_lookup_by_prefix(struct ospf_lsdb *lsdb, uint8_t type, | |
3323 | struct prefix_ipv4 *p, | |
3324 | struct in_addr router_id) | |
3325 | { | |
3326 | struct ospf_lsa *lsa; | |
3327 | struct in_addr mask, id; | |
3328 | struct lsa_header_mask { | |
3329 | struct lsa_header header; | |
3330 | struct in_addr mask; | |
3331 | } * hmask; | |
3332 | ||
3333 | lsa = ospf_lsdb_lookup_by_id(lsdb, type, p->prefix, router_id); | |
3334 | if (lsa == NULL) | |
3335 | return NULL; | |
3336 | ||
3337 | masklen2ip(p->prefixlen, &mask); | |
3338 | ||
3339 | hmask = (struct lsa_header_mask *)lsa->data; | |
3340 | ||
3341 | if (mask.s_addr != hmask->mask.s_addr) { | |
3342 | id.s_addr = p->prefix.s_addr | (~mask.s_addr); | |
3343 | lsa = ospf_lsdb_lookup_by_id(lsdb, type, id, router_id); | |
3344 | if (!lsa) | |
3345 | return NULL; | |
3346 | } | |
3347 | ||
3348 | return lsa; | |
3349 | } | |
3350 | ||
3351 | struct ospf_lsa *ospf_lsa_lookup(struct ospf *ospf, struct ospf_area *area, | |
3352 | uint32_t type, struct in_addr id, | |
3353 | struct in_addr adv_router) | |
3354 | { | |
3355 | if (!ospf) | |
3356 | return NULL; | |
3357 | ||
3358 | switch (type) { | |
3359 | case OSPF_ROUTER_LSA: | |
3360 | case OSPF_NETWORK_LSA: | |
3361 | case OSPF_SUMMARY_LSA: | |
3362 | case OSPF_ASBR_SUMMARY_LSA: | |
3363 | case OSPF_AS_NSSA_LSA: | |
3364 | case OSPF_OPAQUE_LINK_LSA: | |
3365 | case OSPF_OPAQUE_AREA_LSA: | |
3366 | return ospf_lsdb_lookup_by_id(area->lsdb, type, id, adv_router); | |
3367 | case OSPF_AS_EXTERNAL_LSA: | |
3368 | case OSPF_OPAQUE_AS_LSA: | |
3369 | return ospf_lsdb_lookup_by_id(ospf->lsdb, type, id, adv_router); | |
3370 | default: | |
3371 | break; | |
3372 | } | |
3373 | ||
3374 | return NULL; | |
3375 | } | |
3376 | ||
3377 | struct ospf_lsa *ospf_lsa_lookup_by_id(struct ospf_area *area, uint32_t type, | |
3378 | struct in_addr id) | |
3379 | { | |
3380 | struct ospf_lsa *lsa; | |
3381 | struct route_node *rn; | |
3382 | ||
3383 | switch (type) { | |
3384 | case OSPF_ROUTER_LSA: | |
3385 | return ospf_lsdb_lookup_by_id(area->lsdb, type, id, id); | |
3386 | case OSPF_NETWORK_LSA: | |
3387 | for (rn = route_top(NETWORK_LSDB(area)); rn; | |
3388 | rn = route_next(rn)) | |
3389 | if ((lsa = rn->info)) | |
3390 | if (IPV4_ADDR_SAME(&lsa->data->id, &id)) { | |
3391 | route_unlock_node(rn); | |
3392 | return lsa; | |
3393 | } | |
3394 | break; | |
3395 | case OSPF_SUMMARY_LSA: | |
3396 | case OSPF_ASBR_SUMMARY_LSA: | |
3397 | /* Currently not used. */ | |
3398 | assert(1); | |
3399 | return ospf_lsdb_lookup_by_id(area->lsdb, type, id, id); | |
3400 | case OSPF_AS_EXTERNAL_LSA: | |
3401 | case OSPF_AS_NSSA_LSA: | |
3402 | case OSPF_OPAQUE_LINK_LSA: | |
3403 | case OSPF_OPAQUE_AREA_LSA: | |
3404 | case OSPF_OPAQUE_AS_LSA: | |
3405 | /* Currently not used. */ | |
3406 | break; | |
3407 | default: | |
3408 | break; | |
3409 | } | |
3410 | ||
3411 | return NULL; | |
3412 | } | |
3413 | ||
3414 | struct ospf_lsa *ospf_lsa_lookup_by_adv_rid(struct ospf_area *area, | |
3415 | uint32_t type, struct in_addr id) | |
3416 | { | |
3417 | struct ospf_lsa *lsa = NULL; | |
3418 | struct route_node *rn = NULL; | |
3419 | ||
3420 | switch (type) { | |
3421 | case OSPF_ROUTER_LSA: | |
3422 | for (rn = route_top(ROUTER_LSDB(area)); rn; | |
3423 | rn = route_next(rn)) { | |
3424 | lsa = rn->info; | |
3425 | if (lsa) { | |
3426 | if (IPV4_ADDR_SAME(&lsa->data->adv_router, | |
3427 | &id)) { | |
3428 | route_unlock_node(rn); | |
3429 | return lsa; | |
3430 | } | |
3431 | } | |
3432 | } | |
3433 | break; | |
3434 | case OSPF_NETWORK_LSA: | |
3435 | case OSPF_SUMMARY_LSA: | |
3436 | case OSPF_ASBR_SUMMARY_LSA: | |
3437 | case OSPF_AS_EXTERNAL_LSA: | |
3438 | case OSPF_AS_NSSA_LSA: | |
3439 | case OSPF_OPAQUE_LINK_LSA: | |
3440 | case OSPF_OPAQUE_AREA_LSA: | |
3441 | case OSPF_OPAQUE_AS_LSA: | |
3442 | /* Currently not used. */ | |
3443 | break; | |
3444 | default: | |
3445 | break; | |
3446 | } | |
3447 | ||
3448 | return NULL; | |
3449 | } | |
3450 | ||
3451 | struct ospf_lsa *ospf_lsa_lookup_by_mpls_te_rid(struct ospf_area *area, | |
3452 | uint32_t type, | |
3453 | struct in_addr id) | |
3454 | { | |
3455 | struct ospf_lsa *lsa = NULL; | |
3456 | struct route_node *rn = NULL; | |
3457 | struct lsa_header *lsah = NULL; | |
3458 | uint32_t lsid; | |
3459 | uint8_t opaque_type; | |
3460 | struct tlv_header *tlvh = NULL; | |
3461 | struct te_tlv_router_addr *router_addr = NULL; | |
3462 | ||
3463 | if (type != OSPF_OPAQUE_AREA_LSA) | |
3464 | return NULL; | |
3465 | ||
3466 | for (rn = route_top(OPAQUE_AREA_LSDB(area)); rn; rn = route_next(rn)) { | |
3467 | lsa = rn->info; | |
3468 | if (lsa) { | |
3469 | lsah = lsa->data; | |
3470 | lsid = ntohl(lsah->id.s_addr); | |
3471 | opaque_type = GET_OPAQUE_TYPE(lsid); | |
3472 | if (opaque_type != OPAQUE_TYPE_TRAFFIC_ENGINEERING_LSA) | |
3473 | continue; | |
3474 | ||
3475 | tlvh = TLV_HDR_TOP(lsah); | |
3476 | if (!tlvh || | |
3477 | (ntohs(tlvh->type) != TE_TLV_ROUTER_ADDR) || | |
3478 | (ntohs(tlvh->length) != TE_LINK_SUBTLV_DEF_SIZE)) | |
3479 | continue; | |
3480 | router_addr = (struct te_tlv_router_addr *)tlvh; | |
3481 | if (IPV4_ADDR_SAME(&router_addr->value, &id)) { | |
3482 | route_unlock_node(rn); | |
3483 | return lsa; | |
3484 | } | |
3485 | } | |
3486 | } | |
3487 | return NULL; | |
3488 | } | |
3489 | ||
3490 | struct ospf_lsa *ospf_lsa_lookup_by_header(struct ospf_area *area, | |
3491 | struct lsa_header *lsah) | |
3492 | { | |
3493 | struct ospf_lsa *match; | |
3494 | ||
3495 | /* | |
3496 | * Strictly speaking, the LSA-ID field for Opaque-LSAs (type-9/10/11) | |
3497 | * is redefined to have two subfields; opaque-type and opaque-id. | |
3498 | * However, it is harmless to treat the two sub fields together, as if | |
3499 | * they two were forming a unique LSA-ID. | |
3500 | */ | |
3501 | ||
3502 | match = ospf_lsa_lookup(area->ospf, area, lsah->type, lsah->id, | |
3503 | lsah->adv_router); | |
3504 | ||
3505 | if (match == NULL) | |
3506 | if (IS_DEBUG_OSPF(lsa, LSA) == OSPF_DEBUG_LSA) | |
3507 | zlog_debug("LSA[Type%d:%pI4]: Lookup by header, NO MATCH", | |
3508 | lsah->type, &lsah->id); | |
3509 | ||
3510 | return match; | |
3511 | } | |
3512 | ||
3513 | /* return +n, l1 is more recent. | |
3514 | return -n, l2 is more recent. | |
3515 | return 0, l1 and l2 is identical. */ | |
3516 | int ospf_lsa_more_recent(struct ospf_lsa *l1, struct ospf_lsa *l2) | |
3517 | { | |
3518 | int r; | |
3519 | int x, y; | |
3520 | ||
3521 | if (l1 == NULL && l2 == NULL) | |
3522 | return 0; | |
3523 | if (l1 == NULL) | |
3524 | return -1; | |
3525 | if (l2 == NULL) | |
3526 | return 1; | |
3527 | ||
3528 | /* compare LS sequence number. */ | |
3529 | x = (int)ntohl(l1->data->ls_seqnum); | |
3530 | y = (int)ntohl(l2->data->ls_seqnum); | |
3531 | if (x > y) | |
3532 | return 1; | |
3533 | if (x < y) | |
3534 | return -1; | |
3535 | ||
3536 | /* compare LS checksum. */ | |
3537 | r = ntohs(l1->data->checksum) - ntohs(l2->data->checksum); | |
3538 | if (r) | |
3539 | return r; | |
3540 | ||
3541 | /* compare LS age. */ | |
3542 | if (IS_LSA_MAXAGE(l1) && !IS_LSA_MAXAGE(l2)) | |
3543 | return 1; | |
3544 | else if (!IS_LSA_MAXAGE(l1) && IS_LSA_MAXAGE(l2)) | |
3545 | return -1; | |
3546 | ||
3547 | /* compare LS age with MaxAgeDiff. */ | |
3548 | if (LS_AGE(l1) - LS_AGE(l2) > OSPF_LSA_MAXAGE_DIFF) | |
3549 | return -1; | |
3550 | else if (LS_AGE(l2) - LS_AGE(l1) > OSPF_LSA_MAXAGE_DIFF) | |
3551 | return 1; | |
3552 | ||
3553 | /* LSAs are identical. */ | |
3554 | return 0; | |
3555 | } | |
3556 | ||
3557 | /* | |
3558 | * Check if two LSAs are different. | |
3559 | * | |
3560 | * l1 | |
3561 | * The first LSA to compare. | |
3562 | * | |
3563 | * l2 | |
3564 | * The second LSA to compare. | |
3565 | * | |
3566 | * ignore_rcvd_flag | |
3567 | * When set to true, ignore whether the LSAs were received from the network | |
3568 | * or not. This parameter should be set to true when checking for topology | |
3569 | * changes as part of the Graceful Restart helper neighbor procedures. | |
3570 | * | |
3571 | * Returns: | |
3572 | * true if the LSAs are different, false otherwise. | |
3573 | */ | |
3574 | int ospf_lsa_different(struct ospf_lsa *l1, struct ospf_lsa *l2, | |
3575 | bool ignore_rcvd_flag) | |
3576 | { | |
3577 | char *p1, *p2; | |
3578 | assert(l1); | |
3579 | assert(l2); | |
3580 | assert(l1->data); | |
3581 | assert(l2->data); | |
3582 | ||
3583 | if (l1->data->options != l2->data->options) | |
3584 | return 1; | |
3585 | ||
3586 | if (IS_LSA_MAXAGE(l1) && !IS_LSA_MAXAGE(l2)) | |
3587 | return 1; | |
3588 | ||
3589 | if (IS_LSA_MAXAGE(l2) && !IS_LSA_MAXAGE(l1)) | |
3590 | return 1; | |
3591 | ||
3592 | if (l1->size != l2->size) | |
3593 | return 1; | |
3594 | ||
3595 | if (l1->size == 0) | |
3596 | return 1; | |
3597 | ||
3598 | if (!ignore_rcvd_flag | |
3599 | && CHECK_FLAG((l1->flags ^ l2->flags), OSPF_LSA_RECEIVED)) | |
3600 | return 1; /* May be a stale LSA in the LSBD */ | |
3601 | ||
3602 | if (l1->size == OSPF_LSA_HEADER_SIZE) | |
3603 | return 0; /* nothing to compare */ | |
3604 | ||
3605 | p1 = (char *)l1->data; | |
3606 | p2 = (char *)l2->data; | |
3607 | ||
3608 | if (memcmp(p1 + OSPF_LSA_HEADER_SIZE, p2 + OSPF_LSA_HEADER_SIZE, | |
3609 | l1->size - OSPF_LSA_HEADER_SIZE) | |
3610 | != 0) | |
3611 | return 1; | |
3612 | ||
3613 | return 0; | |
3614 | } | |
3615 | ||
3616 | int ospf_lsa_flush_schedule(struct ospf *ospf, struct ospf_lsa *lsa) | |
3617 | { | |
3618 | if (lsa == NULL || !IS_LSA_SELF(lsa)) | |
3619 | return 0; | |
3620 | ||
3621 | if (IS_DEBUG_OSPF_EVENT) | |
3622 | zlog_debug( | |
3623 | "LSA[Type%d:%pI4]: Schedule self-originated LSA to FLUSH", | |
3624 | lsa->data->type, &lsa->data->id); | |
3625 | ||
3626 | /* Force given lsa's age to MaxAge. */ | |
3627 | lsa->data->ls_age = htons(OSPF_LSA_MAXAGE); | |
3628 | ||
3629 | switch (lsa->data->type) { | |
3630 | /* Opaque wants to be notified of flushes */ | |
3631 | case OSPF_OPAQUE_LINK_LSA: | |
3632 | case OSPF_OPAQUE_AREA_LSA: | |
3633 | case OSPF_OPAQUE_AS_LSA: | |
3634 | ospf_opaque_lsa_refresh(lsa); | |
3635 | break; | |
3636 | default: | |
3637 | ospf_refresher_unregister_lsa(ospf, lsa); | |
3638 | ospf_lsa_flush(ospf, lsa); | |
3639 | break; | |
3640 | } | |
3641 | ||
3642 | return 0; | |
3643 | } | |
3644 | ||
3645 | void ospf_flush_self_originated_lsas_now(struct ospf *ospf) | |
3646 | { | |
3647 | struct listnode *node, *nnode; | |
3648 | struct listnode *node2, *nnode2; | |
3649 | struct ospf_area *area; | |
3650 | struct ospf_interface *oi; | |
3651 | struct ospf_lsa *lsa; | |
3652 | struct route_node *rn; | |
3653 | struct ospf_if_params *oip; | |
3654 | int need_to_flush_ase = 0; | |
3655 | ||
3656 | ospf->inst_shutdown = 1; | |
3657 | ||
3658 | for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) { | |
3659 | if ((lsa = area->router_lsa_self) != NULL) { | |
3660 | if (IS_DEBUG_OSPF_EVENT) | |
3661 | zlog_debug( | |
3662 | "LSA[Type%d:%pI4]: Schedule self-originated LSA to FLUSH", | |
3663 | lsa->data->type, | |
3664 | &lsa->data->id); | |
3665 | ||
3666 | ospf_refresher_unregister_lsa(ospf, lsa); | |
3667 | ospf_lsa_flush_area(lsa, area); | |
3668 | ospf_lsa_unlock(&area->router_lsa_self); | |
3669 | area->router_lsa_self = NULL; | |
3670 | } | |
3671 | ||
3672 | for (ALL_LIST_ELEMENTS(area->oiflist, node2, nnode2, oi)) { | |
3673 | if ((lsa = oi->network_lsa_self) != NULL | |
3674 | && oi->state == ISM_DR && oi->full_nbrs > 0) { | |
3675 | if (IS_DEBUG_OSPF_EVENT) | |
3676 | zlog_debug( | |
3677 | "LSA[Type%d:%pI4]: Schedule self-originated LSA to FLUSH", | |
3678 | lsa->data->type, | |
3679 | &lsa->data->id); | |
3680 | ||
3681 | ospf_refresher_unregister_lsa( | |
3682 | ospf, oi->network_lsa_self); | |
3683 | ospf_lsa_flush_area(oi->network_lsa_self, area); | |
3684 | ospf_lsa_unlock(&oi->network_lsa_self); | |
3685 | oi->network_lsa_self = NULL; | |
3686 | ||
3687 | oip = ospf_lookup_if_params( | |
3688 | oi->ifp, oi->address->u.prefix4); | |
3689 | if (oip) | |
3690 | oip->network_lsa_seqnum = htonl( | |
3691 | OSPF_INVALID_SEQUENCE_NUMBER); | |
3692 | } | |
3693 | ||
3694 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK | |
3695 | && area->external_routing == OSPF_AREA_DEFAULT) | |
3696 | need_to_flush_ase = 1; | |
3697 | } | |
3698 | ||
3699 | LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa) | |
3700 | ospf_lsa_flush_schedule(ospf, lsa); | |
3701 | LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa) | |
3702 | ospf_lsa_flush_schedule(ospf, lsa); | |
3703 | LSDB_LOOP (OPAQUE_LINK_LSDB(area), rn, lsa) | |
3704 | ospf_lsa_flush_schedule(ospf, lsa); | |
3705 | LSDB_LOOP (OPAQUE_AREA_LSDB(area), rn, lsa) | |
3706 | ospf_lsa_flush_schedule(ospf, lsa); | |
3707 | } | |
3708 | ||
3709 | if (need_to_flush_ase) { | |
3710 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) | |
3711 | ospf_lsa_flush_schedule(ospf, lsa); | |
3712 | LSDB_LOOP (OPAQUE_AS_LSDB(ospf), rn, lsa) | |
3713 | ospf_lsa_flush_schedule(ospf, lsa); | |
3714 | } | |
3715 | ||
3716 | /* | |
3717 | * Make sure that the MaxAge LSA remover is executed immediately, | |
3718 | * without conflicting to other threads. | |
3719 | */ | |
3720 | if (ospf->t_maxage != NULL) { | |
3721 | THREAD_OFF(ospf->t_maxage); | |
3722 | thread_execute(master, ospf_maxage_lsa_remover, ospf, 0); | |
3723 | } | |
3724 | ||
3725 | return; | |
3726 | } | |
3727 | ||
3728 | /* If there is self-originated LSA, then return 1, otherwise return 0. */ | |
3729 | /* An interface-independent version of ospf_lsa_is_self_originated */ | |
3730 | int ospf_lsa_is_self_originated(struct ospf *ospf, struct ospf_lsa *lsa) | |
3731 | { | |
3732 | struct listnode *node; | |
3733 | struct ospf_interface *oi; | |
3734 | ||
3735 | /* This LSA is already checked. */ | |
3736 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_SELF_CHECKED)) | |
3737 | return IS_LSA_SELF(lsa); | |
3738 | ||
3739 | /* Make sure LSA is self-checked. */ | |
3740 | SET_FLAG(lsa->flags, OSPF_LSA_SELF_CHECKED); | |
3741 | ||
3742 | /* AdvRouter and Router ID is the same. */ | |
3743 | if (IPV4_ADDR_SAME(&lsa->data->adv_router, &ospf->router_id)) | |
3744 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
3745 | ||
3746 | /* LSA is router-LSA. */ | |
3747 | else if (lsa->data->type == OSPF_ROUTER_LSA | |
3748 | && IPV4_ADDR_SAME(&lsa->data->id, &ospf->router_id)) | |
3749 | SET_FLAG(lsa->flags, OSPF_LSA_SELF); | |
3750 | ||
3751 | /* LSA is network-LSA. Compare Link ID with all interfaces. */ | |
3752 | else if (lsa->data->type == OSPF_NETWORK_LSA) | |
3753 | for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) { | |
3754 | /* Ignore virtual link. */ | |
3755 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
3756 | if (oi->address->family == AF_INET) | |
3757 | if (IPV4_ADDR_SAME( | |
3758 | &lsa->data->id, | |
3759 | &oi->address->u.prefix4)) { | |
3760 | /* to make it easier later */ | |
3761 | SET_FLAG(lsa->flags, | |
3762 | OSPF_LSA_SELF); | |
3763 | return IS_LSA_SELF(lsa); | |
3764 | } | |
3765 | } | |
3766 | ||
3767 | return IS_LSA_SELF(lsa); | |
3768 | } | |
3769 | ||
3770 | /* Get unique Link State ID. */ | |
3771 | enum lsid_status ospf_lsa_unique_id(struct ospf *ospf, struct ospf_lsdb *lsdb, | |
3772 | uint8_t type, struct prefix_ipv4 *p, | |
3773 | struct in_addr *id) | |
3774 | { | |
3775 | struct ospf_lsa *lsa; | |
3776 | struct in_addr mask; | |
3777 | ||
3778 | *id = p->prefix; | |
3779 | ||
3780 | /* Check existence of LSA instance. */ | |
3781 | lsa = ospf_lsdb_lookup_by_id(lsdb, type, *id, ospf->router_id); | |
3782 | if (lsa) { | |
3783 | struct as_external_lsa *al = | |
3784 | (struct as_external_lsa *)lsa->data; | |
3785 | /* Ref rfc2328,Appendex E.1 | |
3786 | * If router already originated the external lsa with lsid | |
3787 | * as the current prefix, and the masklens are same then | |
3788 | * terminate the LSID algorithem. | |
3789 | */ | |
3790 | if (ip_masklen(al->mask) == p->prefixlen) { | |
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 = 0; */ | |
3796 | id->s_addr = 0xffffffff; | |
3797 | return LSID_NOT_AVAILABLE; | |
3798 | } else if (ip_masklen(al->mask) < p->prefixlen) { | |
3799 | /* Ref rfc2328,Appendex E.2 | |
3800 | * the current prefix masklen is greater than the | |
3801 | * existing LSA, then generate the Link state ID, | |
3802 | * by setting all host bits in prefix addressa and | |
3803 | * originate. | |
3804 | * | |
3805 | * Eg: 1st Route : 10.0.0.0/16 - LSID:10.0.0.0 | |
3806 | * 2nd Route : 10.0.0.0/24 - LSID:10.0.0.255 | |
3807 | */ | |
3808 | masklen2ip(p->prefixlen, &mask); | |
3809 | ||
3810 | id->s_addr = p->prefix.s_addr | (~mask.s_addr); | |
3811 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, type, *id, | |
3812 | ospf->router_id); | |
3813 | if (lsa) { | |
3814 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
3815 | zlog_debug( | |
3816 | "%s: Can't get Link State ID for %pFX", | |
3817 | __func__, p); | |
3818 | id->s_addr = 0xffffffff; | |
3819 | return LSID_NOT_AVAILABLE; | |
3820 | } | |
3821 | } else { | |
3822 | /* Ref rfc2328,Appendex E.3 | |
3823 | * the current prefix masklen is lesser than the | |
3824 | * existing LSA,then the originated LSA has to be | |
3825 | * refreshed by modifying masklen, cost and tag. | |
3826 | * Originate the old route info with new LSID by | |
3827 | * setting the host bits in prefix address. | |
3828 | * | |
3829 | * Eg: 1st Route : 10.0.0.0/24 - LSID:10.0.0.0 | |
3830 | * 2nd Route : 10.0.0.0/16 - ? | |
3831 | * Since 2nd route mask len is less than firstone | |
3832 | * LSID has to be changed. | |
3833 | * 1st route LSID:10.0.0.255 | |
3834 | * 2nd route LSID:10.0.0.0 | |
3835 | */ | |
3836 | id->s_addr = lsa->data->id.s_addr | (~al->mask.s_addr); | |
3837 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, type, *id, | |
3838 | ospf->router_id); | |
3839 | if (lsa && (ip_masklen(al->mask) != IPV4_MAX_BITLEN)) { | |
3840 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) | |
3841 | zlog_debug( | |
3842 | "%s: Can't get Link State ID for %pFX", | |
3843 | __func__, p); | |
3844 | id->s_addr = 0xffffffff; | |
3845 | return LSID_NOT_AVAILABLE; | |
3846 | } | |
3847 | return LSID_CHANGE; | |
3848 | } | |
3849 | } | |
3850 | ||
3851 | return LSID_AVAILABLE; | |
3852 | } | |
3853 | ||
3854 | ||
3855 | #define LSA_ACTION_FLOOD_AREA 1 | |
3856 | #define LSA_ACTION_FLUSH_AREA 2 | |
3857 | ||
3858 | struct lsa_action { | |
3859 | uint8_t action; | |
3860 | struct ospf_area *area; | |
3861 | struct ospf_lsa *lsa; | |
3862 | }; | |
3863 | ||
3864 | static void ospf_lsa_action(struct thread *t) | |
3865 | { | |
3866 | struct lsa_action *data; | |
3867 | ||
3868 | data = THREAD_ARG(t); | |
3869 | ||
3870 | if (IS_DEBUG_OSPF(lsa, LSA) == OSPF_DEBUG_LSA) | |
3871 | zlog_debug("LSA[Action]: Performing scheduled LSA action: %d", | |
3872 | data->action); | |
3873 | ||
3874 | switch (data->action) { | |
3875 | case LSA_ACTION_FLOOD_AREA: | |
3876 | ospf_flood_through_area(data->area, NULL, data->lsa); | |
3877 | break; | |
3878 | case LSA_ACTION_FLUSH_AREA: | |
3879 | ospf_lsa_flush_area(data->lsa, data->area); | |
3880 | break; | |
3881 | } | |
3882 | ||
3883 | ospf_lsa_unlock(&data->lsa); /* Message */ | |
3884 | XFREE(MTYPE_OSPF_MESSAGE, data); | |
3885 | } | |
3886 | ||
3887 | void ospf_schedule_lsa_flood_area(struct ospf_area *area, struct ospf_lsa *lsa) | |
3888 | { | |
3889 | struct lsa_action *data; | |
3890 | ||
3891 | data = XCALLOC(MTYPE_OSPF_MESSAGE, sizeof(struct lsa_action)); | |
3892 | data->action = LSA_ACTION_FLOOD_AREA; | |
3893 | data->area = area; | |
3894 | data->lsa = ospf_lsa_lock(lsa); /* Message / Flood area */ | |
3895 | ||
3896 | thread_add_event(master, ospf_lsa_action, data, 0, NULL); | |
3897 | } | |
3898 | ||
3899 | void ospf_schedule_lsa_flush_area(struct ospf_area *area, struct ospf_lsa *lsa) | |
3900 | { | |
3901 | struct lsa_action *data; | |
3902 | ||
3903 | data = XCALLOC(MTYPE_OSPF_MESSAGE, sizeof(struct lsa_action)); | |
3904 | data->action = LSA_ACTION_FLUSH_AREA; | |
3905 | data->area = area; | |
3906 | data->lsa = ospf_lsa_lock(lsa); /* Message / Flush area */ | |
3907 | ||
3908 | thread_add_event(master, ospf_lsa_action, data, 0, NULL); | |
3909 | } | |
3910 | ||
3911 | ||
3912 | /* LSA Refreshment functions. */ | |
3913 | struct ospf_lsa *ospf_lsa_refresh(struct ospf *ospf, struct ospf_lsa *lsa) | |
3914 | { | |
3915 | struct external_info *ei; | |
3916 | struct ospf_external_aggr_rt *aggr; | |
3917 | struct ospf_lsa *new = NULL; | |
3918 | struct as_external_lsa *al; | |
3919 | struct prefix_ipv4 p; | |
3920 | ||
3921 | if (!CHECK_FLAG(lsa->flags, OSPF_LSA_SELF) && !IS_LSA_SELF(lsa) && | |
3922 | !IS_LSA_ORR(lsa)) | |
3923 | return NULL; | |
3924 | assert(lsa->lock > 0); | |
3925 | ||
3926 | switch (lsa->data->type) { | |
3927 | /* Router and Network LSAs are processed differently. */ | |
3928 | case OSPF_ROUTER_LSA: | |
3929 | new = ospf_router_lsa_refresh(lsa); | |
3930 | break; | |
3931 | case OSPF_NETWORK_LSA: | |
3932 | new = ospf_network_lsa_refresh(lsa); | |
3933 | break; | |
3934 | case OSPF_SUMMARY_LSA: | |
3935 | new = ospf_summary_lsa_refresh(ospf, lsa); | |
3936 | break; | |
3937 | case OSPF_ASBR_SUMMARY_LSA: | |
3938 | new = ospf_summary_asbr_lsa_refresh(ospf, lsa); | |
3939 | break; | |
3940 | case OSPF_AS_EXTERNAL_LSA: | |
3941 | /* Translated from NSSA Type-5s are refreshed when | |
3942 | * from refresh of Type-7 - do not refresh these directly. | |
3943 | */ | |
3944 | ||
3945 | al = (struct as_external_lsa *)lsa->data; | |
3946 | p.family = AF_INET; | |
3947 | p.prefixlen = ip_masklen(al->mask); | |
3948 | p.prefix = lsa->data->id; | |
3949 | ||
3950 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
3951 | break; | |
3952 | ei = ospf_external_info_check(ospf, lsa); | |
3953 | if (ei) | |
3954 | new = ospf_external_lsa_refresh( | |
3955 | ospf, lsa, ei, LSA_REFRESH_FORCE, false); | |
3956 | else { | |
3957 | aggr = (struct ospf_external_aggr_rt *) | |
3958 | ospf_extrenal_aggregator_lookup(ospf, &p); | |
3959 | if (aggr) { | |
3960 | struct external_info ei_aggr; | |
3961 | ||
3962 | memset(&ei_aggr, 0, sizeof(ei_aggr)); | |
3963 | ei_aggr.p = aggr->p; | |
3964 | ei_aggr.tag = aggr->tag; | |
3965 | ei_aggr.instance = ospf->instance; | |
3966 | ei_aggr.route_map_set.metric = -1; | |
3967 | ei_aggr.route_map_set.metric_type = -1; | |
3968 | ||
3969 | ospf_external_lsa_refresh(ospf, lsa, &ei_aggr, | |
3970 | LSA_REFRESH_FORCE, true); | |
3971 | SET_FLAG(aggr->flags, | |
3972 | OSPF_EXTERNAL_AGGRT_ORIGINATED); | |
3973 | } else | |
3974 | ospf_lsa_flush_as(ospf, lsa); | |
3975 | } | |
3976 | break; | |
3977 | case OSPF_OPAQUE_LINK_LSA: | |
3978 | case OSPF_OPAQUE_AREA_LSA: | |
3979 | case OSPF_OPAQUE_AS_LSA: | |
3980 | new = ospf_opaque_lsa_refresh(lsa); | |
3981 | break; | |
3982 | default: | |
3983 | break; | |
3984 | } | |
3985 | return new; | |
3986 | } | |
3987 | ||
3988 | void ospf_refresher_register_lsa(struct ospf *ospf, struct ospf_lsa *lsa) | |
3989 | { | |
3990 | uint16_t index, current_index; | |
3991 | ||
3992 | assert(lsa->lock > 0); | |
3993 | if (!IS_LSA_SELF(lsa) && !IS_LSA_ORR(lsa)) | |
3994 | return; | |
3995 | ||
3996 | if (lsa->refresh_list < 0) { | |
3997 | int delay; | |
3998 | int min_delay = | |
3999 | ospf->lsa_refresh_timer - (2 * OSPF_LS_REFRESH_JITTER); | |
4000 | int max_delay = | |
4001 | ospf->lsa_refresh_timer - OSPF_LS_REFRESH_JITTER; | |
4002 | ||
4003 | /* We want to refresh the LSA within OSPF_LS_REFRESH_TIME which | |
4004 | * is | |
4005 | * 1800s. Use jitter so that we send the LSA sometime between | |
4006 | * 1680s | |
4007 | * and 1740s. | |
4008 | */ | |
4009 | delay = (frr_weak_random() % (max_delay - min_delay)) | |
4010 | + min_delay; | |
4011 | ||
4012 | current_index = ospf->lsa_refresh_queue.index | |
4013 | + (monotime(NULL) - ospf->lsa_refresher_started) | |
4014 | / OSPF_LSA_REFRESHER_GRANULARITY; | |
4015 | ||
4016 | index = (current_index + delay / OSPF_LSA_REFRESHER_GRANULARITY) | |
4017 | % (OSPF_LSA_REFRESHER_SLOTS); | |
4018 | ||
4019 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4020 | zlog_debug( | |
4021 | "LSA[Refresh:Type%d:%pI4]: age %d, added to index %d", | |
4022 | lsa->data->type, &lsa->data->id, | |
4023 | LS_AGE(lsa), index); | |
4024 | ||
4025 | if (!ospf->lsa_refresh_queue.qs[index]) | |
4026 | ospf->lsa_refresh_queue.qs[index] = list_new(); | |
4027 | ||
4028 | listnode_add(ospf->lsa_refresh_queue.qs[index], | |
4029 | ospf_lsa_lock(lsa)); /* lsa_refresh_queue */ | |
4030 | lsa->refresh_list = index; | |
4031 | ||
4032 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4033 | zlog_debug( | |
4034 | "LSA[Refresh:Type%d:%pI4]: %s: setting refresh_list on lsa %p (slot %d)", | |
4035 | lsa->data->type, &lsa->data->id, __func__, | |
4036 | (void *)lsa, index); | |
4037 | } | |
4038 | } | |
4039 | ||
4040 | void ospf_refresher_unregister_lsa(struct ospf *ospf, struct ospf_lsa *lsa) | |
4041 | { | |
4042 | assert(lsa->lock > 0); | |
4043 | if (!IS_LSA_SELF(lsa) || !IS_LSA_ORR(lsa)) | |
4044 | return; | |
4045 | if (lsa->refresh_list >= 0) { | |
4046 | struct list *refresh_list = | |
4047 | ospf->lsa_refresh_queue.qs[lsa->refresh_list]; | |
4048 | listnode_delete(refresh_list, lsa); | |
4049 | if (!listcount(refresh_list)) { | |
4050 | list_delete(&refresh_list); | |
4051 | ospf->lsa_refresh_queue.qs[lsa->refresh_list] = NULL; | |
4052 | } | |
4053 | lsa->refresh_list = -1; | |
4054 | ospf_lsa_unlock(&lsa); /* lsa_refresh_queue */ | |
4055 | } | |
4056 | } | |
4057 | ||
4058 | void ospf_lsa_refresh_walker(struct thread *t) | |
4059 | { | |
4060 | struct list *refresh_list; | |
4061 | struct listnode *node, *nnode; | |
4062 | struct ospf *ospf = THREAD_ARG(t); | |
4063 | struct ospf_lsa *lsa; | |
4064 | int i; | |
4065 | struct list *lsa_to_refresh = list_new(); | |
4066 | ||
4067 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4068 | zlog_debug("LSA[Refresh]: %s: start", __func__); | |
4069 | ||
4070 | ||
4071 | i = ospf->lsa_refresh_queue.index; | |
4072 | ||
4073 | /* Note: if clock has jumped backwards, then time change could be | |
4074 | negative, | |
4075 | so we are careful to cast the expression to unsigned before taking | |
4076 | modulus. */ | |
4077 | ospf->lsa_refresh_queue.index = | |
4078 | ((unsigned long)(ospf->lsa_refresh_queue.index | |
4079 | + (monotime(NULL) | |
4080 | - ospf->lsa_refresher_started) | |
4081 | / OSPF_LSA_REFRESHER_GRANULARITY)) | |
4082 | % OSPF_LSA_REFRESHER_SLOTS; | |
4083 | ||
4084 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4085 | zlog_debug("LSA[Refresh]: %s: next index %d", __func__, | |
4086 | ospf->lsa_refresh_queue.index); | |
4087 | ||
4088 | for (; i != ospf->lsa_refresh_queue.index; | |
4089 | i = (i + 1) % OSPF_LSA_REFRESHER_SLOTS) { | |
4090 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4091 | zlog_debug("LSA[Refresh]: %s: refresh index %d", | |
4092 | __func__, i); | |
4093 | ||
4094 | refresh_list = ospf->lsa_refresh_queue.qs[i]; | |
4095 | ||
4096 | assert(i >= 0); | |
4097 | ||
4098 | ospf->lsa_refresh_queue.qs[i] = NULL; | |
4099 | ||
4100 | if (refresh_list) { | |
4101 | for (ALL_LIST_ELEMENTS(refresh_list, node, nnode, | |
4102 | lsa)) { | |
4103 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4104 | zlog_debug( | |
4105 | "LSA[Refresh:Type%d:%pI4]: %s: refresh lsa %p (slot %d)", | |
4106 | lsa->data->type, &lsa->data->id, | |
4107 | __func__, (void *)lsa, i); | |
4108 | ||
4109 | assert(lsa->lock > 0); | |
4110 | list_delete_node(refresh_list, node); | |
4111 | lsa->refresh_list = -1; | |
4112 | listnode_add(lsa_to_refresh, lsa); | |
4113 | } | |
4114 | list_delete(&refresh_list); | |
4115 | } | |
4116 | } | |
4117 | ||
4118 | ospf->t_lsa_refresher = NULL; | |
4119 | thread_add_timer(master, ospf_lsa_refresh_walker, ospf, | |
4120 | ospf->lsa_refresh_interval, &ospf->t_lsa_refresher); | |
4121 | ospf->lsa_refresher_started = monotime(NULL); | |
4122 | ||
4123 | for (ALL_LIST_ELEMENTS(lsa_to_refresh, node, nnode, lsa)) { | |
4124 | ospf_lsa_refresh(ospf, lsa); | |
4125 | assert(lsa->lock > 0); | |
4126 | ospf_lsa_unlock( | |
4127 | &lsa); /* lsa_refresh_queue & temp for lsa_to_refresh*/ | |
4128 | } | |
4129 | ||
4130 | list_delete(&lsa_to_refresh); | |
4131 | ||
4132 | if (IS_DEBUG_OSPF(lsa, LSA_REFRESH)) | |
4133 | zlog_debug("LSA[Refresh]: %s: end", __func__); | |
4134 | } | |
4135 | ||
4136 | /* Flush the LSAs for the specific area */ | |
4137 | void ospf_flush_lsa_from_area(struct ospf *ospf, struct in_addr area_id, | |
4138 | int type) | |
4139 | { | |
4140 | struct ospf_area *area; | |
4141 | struct route_node *rn; | |
4142 | struct ospf_lsa *lsa; | |
4143 | ||
4144 | area = ospf_area_get(ospf, area_id); | |
4145 | ||
4146 | switch (type) { | |
4147 | case OSPF_AS_EXTERNAL_LSA: | |
4148 | if ((area->external_routing == OSPF_AREA_NSSA) || | |
4149 | (area->external_routing == OSPF_AREA_STUB)) { | |
4150 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) | |
4151 | if (IS_LSA_SELF(lsa) && | |
4152 | !(CHECK_FLAG(lsa->flags, | |
4153 | OSPF_LSA_LOCAL_XLT))) | |
4154 | ospf_lsa_flush_area(lsa, area); | |
4155 | } | |
4156 | break; | |
4157 | case OSPF_AS_NSSA_LSA: | |
4158 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) | |
4159 | if (IS_LSA_SELF(lsa)) | |
4160 | ospf_lsa_flush_area(lsa, area); | |
4161 | break; | |
4162 | default: | |
4163 | break; | |
4164 | } | |
4165 | } |