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ad500b22 K |
1 | /* |
2 | * OSPFv3 Not So Stubby Area implementation. | |
3 | * | |
4 | * Copyright (C) 2021 Kaushik Nath | |
5 | * Copyright (C) 2021 Soman K.S | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU 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; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
20 | */ | |
21 | ||
22 | #include <zebra.h> | |
23 | #include "log.h" | |
24 | #include "prefix.h" | |
25 | #include "table.h" | |
26 | #include "vty.h" | |
27 | #include "linklist.h" | |
28 | #include "command.h" | |
29 | #include "thread.h" | |
30 | #include "plist.h" | |
31 | #include "filter.h" | |
32 | ||
33 | #include "ospf6_proto.h" | |
34 | #include "ospf6_route.h" | |
35 | #include "ospf6_lsa.h" | |
36 | #include "ospf6_route.h" | |
37 | #include "ospf6_lsdb.h" | |
38 | #include "ospf6_message.h" | |
39 | #include "ospf6_zebra.h" | |
40 | ||
41 | #include "ospf6_top.h" | |
42 | #include "ospf6_area.h" | |
43 | #include "ospf6_interface.h" | |
44 | #include "ospf6_neighbor.h" | |
45 | ||
46 | #include "ospf6_flood.h" | |
47 | #include "ospf6_intra.h" | |
48 | #include "ospf6_abr.h" | |
49 | #include "ospf6_asbr.h" | |
50 | #include "ospf6d.h" | |
51 | #include "ospf6_nssa.h" | |
52 | ||
53 | DEFINE_MTYPE_STATIC(OSPF6D, OSPF6_LSA, "OSPF6 LSA"); | |
54 | unsigned char config_debug_ospf6_nssa = 0; | |
55 | /* Determine whether this router is elected translator or not for area */ | |
56 | static int ospf6_abr_nssa_am_elected(struct ospf6_area *oa) | |
57 | { | |
58 | struct ospf6_lsa *lsa; | |
59 | struct ospf6_router_lsa *router_lsa; | |
60 | in_addr_t *best = NULL; | |
61 | uint16_t type; | |
62 | ||
63 | type = htons(OSPF6_LSTYPE_ROUTER); | |
64 | ||
65 | /* Verify all the router LSA to compare the router ID */ | |
66 | for (ALL_LSDB_TYPED(oa->lsdb, type, lsa)) { | |
67 | ||
68 | router_lsa = (struct ospf6_router_lsa | |
69 | *)((caddr_t)lsa->header | |
70 | + sizeof(struct ospf6_lsa_header)); | |
71 | ||
72 | /* ignore non-ABR routers */ | |
73 | if (!CHECK_FLAG(router_lsa->bits, OSPF6_ROUTER_BIT_B)) | |
74 | continue; | |
75 | ||
76 | /* Router has Nt flag - always translate */ | |
77 | if (CHECK_FLAG(router_lsa->bits, OSPF6_ROUTER_BIT_NT)) { | |
78 | if (IS_OSPF6_DEBUG_NSSA) | |
79 | zlog_debug("%s: router %pI4 asserts Nt", | |
80 | __func__, &lsa->header->id); | |
81 | return 1; | |
82 | } | |
83 | ||
84 | if (best == NULL) | |
85 | best = &lsa->header->adv_router; | |
86 | else if (IPV4_ADDR_CMP(best, &lsa->header->adv_router) < 0) | |
87 | best = &lsa->header->adv_router; | |
88 | } | |
89 | ||
90 | if (best == NULL) { | |
91 | if (IS_OSPF6_DEBUG_NSSA) | |
92 | zlog_debug("%s: best electable ABR not found", | |
93 | __func__); | |
94 | return 0; | |
95 | } | |
96 | ||
97 | if (IS_OSPF6_DEBUG_NSSA) | |
98 | zlog_debug("%s: best electable ABR is: %pI4", __func__, best); | |
99 | ||
100 | if (IPV4_ADDR_CMP(best, &oa->ospf6->router_id) <= 0) { | |
101 | if (IS_OSPF6_DEBUG_NSSA) | |
102 | zlog_debug("%s: elected ABR is: %pI4", __func__, best); | |
103 | return 1; | |
104 | } else { | |
105 | if (IS_OSPF6_DEBUG_NSSA) | |
106 | zlog_debug("%s: not elected best %pI4, router ID %pI4", | |
107 | __func__, best, &oa->ospf6->router_id); | |
108 | return 0; | |
109 | } | |
110 | } | |
111 | ||
112 | /* Flush the translated LSA when translation is disabled */ | |
113 | static void ospf6_flush_translated_lsa(struct ospf6_area *area) | |
114 | { | |
115 | uint16_t type; | |
116 | struct ospf6_lsa *type7; | |
117 | struct ospf6_lsa *type5; | |
118 | struct ospf6 *ospf6 = area->ospf6; | |
119 | ||
120 | if (IS_OSPF6_DEBUG_NSSA) | |
121 | zlog_debug("%s: start area %s", __func__, area->name); | |
122 | ||
123 | type = htons(OSPF6_LSTYPE_TYPE_7); | |
124 | for (ALL_LSDB_TYPED_ADVRTR(area->lsdb, type, ospf6->router_id, type7)) { | |
125 | type5 = ospf6_lsdb_lookup(htons(OSPF6_LSTYPE_AS_EXTERNAL), | |
126 | type7->external_lsa_id, | |
127 | ospf6->router_id, ospf6->lsdb); | |
128 | if (type5 && CHECK_FLAG(type5->flag, OSPF6_LSA_LOCAL_XLT)) | |
129 | ospf6_lsa_premature_aging(type5); | |
130 | } | |
131 | if (IS_OSPF6_DEBUG_NSSA) | |
132 | zlog_debug("%s: finish area %s", __func__, area->name); | |
133 | } | |
134 | ||
135 | /* Check NSSA status for all nssa areas*/ | |
136 | void ospf6_abr_nssa_check_status(struct ospf6 *ospf6) | |
137 | { | |
138 | struct ospf6_area *area; | |
139 | struct listnode *lnode, *nnode; | |
140 | ||
141 | for (ALL_LIST_ELEMENTS(ospf6->area_list, lnode, nnode, area)) { | |
edfab98f | 142 | uint8_t old_state = area->NSSATranslatorState; |
ad500b22 K |
143 | |
144 | if (IS_OSPF6_DEBUG_NSSA) | |
145 | zlog_debug("%s: checking area %s flag %x", __func__, | |
146 | area->name, area->flag); | |
147 | ||
148 | if (!IS_AREA_NSSA(area)) | |
149 | continue; | |
150 | ||
151 | if (!CHECK_FLAG(area->ospf6->flag, OSPF6_FLAG_ABR)) { | |
152 | if (IS_OSPF6_DEBUG_NSSA) | |
153 | zlog_debug("%s: not ABR", __func__); | |
154 | area->NSSATranslatorState = | |
155 | OSPF6_NSSA_TRANSLATE_DISABLED; | |
156 | ospf6_flush_translated_lsa(area); | |
157 | } else { | |
158 | /* Router is ABR */ | |
159 | if (area->NSSATranslatorRole == OSPF6_NSSA_ROLE_ALWAYS) | |
160 | area->NSSATranslatorState = | |
161 | OSPF6_NSSA_TRANSLATE_ENABLED; | |
162 | else { | |
163 | /* We are a candidate for Translation */ | |
164 | if (ospf6_abr_nssa_am_elected(area) > 0) { | |
165 | area->NSSATranslatorState = | |
166 | OSPF6_NSSA_TRANSLATE_ENABLED; | |
167 | if (IS_OSPF6_DEBUG_NSSA) | |
168 | zlog_debug( | |
169 | "%s: elected translator", | |
170 | __func__); | |
171 | } else { | |
172 | area->NSSATranslatorState = | |
173 | OSPF6_NSSA_TRANSLATE_DISABLED; | |
174 | ospf6_flush_translated_lsa(area); | |
175 | if (IS_OSPF6_DEBUG_NSSA) | |
176 | zlog_debug("%s: not elected", | |
177 | __func__); | |
178 | } | |
179 | } | |
180 | } | |
edfab98f IR |
181 | |
182 | /* RFC3101, 3.1: | |
183 | * All NSSA border routers must set the E-bit in the Type-1 | |
184 | * router-LSAs of their directly attached non-stub areas, even | |
185 | * when they are not translating. | |
186 | */ | |
187 | if (old_state != area->NSSATranslatorState) { | |
188 | if (old_state == OSPF6_NSSA_TRANSLATE_DISABLED) | |
189 | ospf6_asbr_status_update(ospf6, | |
190 | ++ospf6->redist_count); | |
191 | else | |
192 | ospf6_asbr_status_update(ospf6, | |
193 | --ospf6->redist_count); | |
194 | } | |
ad500b22 | 195 | } |
ad500b22 K |
196 | } |
197 | ||
198 | /* Mark the summary LSA's as unapproved, when ABR status changes.*/ | |
199 | static void ospf6_abr_unapprove_summaries(struct ospf6 *ospf6) | |
200 | { | |
201 | struct listnode *node, *nnode; | |
202 | struct ospf6_area *area; | |
203 | struct ospf6_lsa *lsa; | |
204 | uint16_t type; | |
205 | ||
206 | if (IS_OSPF6_DEBUG_ABR) | |
207 | zlog_debug("%s : Start", __func__); | |
208 | ||
209 | for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, area)) { | |
210 | if (IS_OSPF6_DEBUG_ABR) | |
211 | zlog_debug("%s : considering area %pI4", __func__, | |
212 | &area->area_id); | |
213 | /* Inter area router LSA */ | |
214 | type = htons(OSPF6_LSTYPE_INTER_ROUTER); | |
215 | for (ALL_LSDB_TYPED_ADVRTR(area->lsdb, type, ospf6->router_id, | |
216 | lsa)) { | |
217 | if (IS_OSPF6_DEBUG_ABR) | |
218 | zlog_debug( | |
219 | "%s : approved unset on summary link id %pI4", | |
220 | __func__, &lsa->header->id); | |
221 | SET_FLAG(lsa->flag, OSPF6_LSA_UNAPPROVED); | |
222 | } | |
223 | /* Inter area prefix LSA */ | |
224 | type = htons(OSPF6_LSTYPE_INTER_PREFIX); | |
225 | for (ALL_LSDB_TYPED_ADVRTR(area->lsdb, type, ospf6->router_id, | |
226 | lsa)) { | |
227 | if (IS_OSPF6_DEBUG_ABR) | |
228 | zlog_debug( | |
229 | "%s : approved unset on asbr-summary link id %pI4", | |
230 | __func__, &lsa->header->id); | |
231 | SET_FLAG(lsa->flag, OSPF6_LSA_UNAPPROVED); | |
232 | } | |
233 | } | |
234 | ||
235 | if (IS_OSPF6_DEBUG_ABR) | |
236 | zlog_debug("%s : Stop", __func__); | |
237 | } | |
238 | ||
239 | /* Re-advertise inter-area router LSA's */ | |
240 | void ospf6_asbr_prefix_readvertise(struct ospf6 *ospf6) | |
241 | { | |
242 | struct ospf6_route *brouter; | |
243 | struct listnode *node, *nnode; | |
244 | struct ospf6_area *oa; | |
245 | ||
246 | if (IS_OSPF6_DEBUG_ABR) | |
247 | zlog_debug("Re-examining Inter-Router prefixes"); | |
248 | ||
249 | ||
250 | for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, oa)) { | |
251 | for (brouter = ospf6_route_head(oa->ospf6->brouter_table); | |
252 | brouter; brouter = ospf6_route_next(brouter)) | |
253 | ospf6_abr_originate_summary_to_area(brouter, oa); | |
254 | } | |
255 | ||
256 | if (IS_OSPF6_DEBUG_ABR) | |
257 | zlog_debug("Finished re-examining Inter-Router prefixes"); | |
258 | } | |
259 | ||
260 | /* Advertise prefixes configured using area <area-id> range command */ | |
261 | static void ospf6_abr_announce_aggregates(struct ospf6 *ospf6) | |
262 | { | |
263 | struct ospf6_area *area; | |
264 | struct ospf6_route *range; | |
265 | struct listnode *node, *nnode; | |
266 | ||
267 | if (IS_OSPF6_DEBUG_ABR) | |
268 | zlog_debug("ospf6_abr_announce_aggregates(): Start"); | |
269 | ||
270 | for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, area)) { | |
271 | for (range = ospf6_route_head(area->range_table); range; | |
272 | range = ospf6_route_next(range)) | |
273 | ospf6_abr_range_update(range, ospf6); | |
274 | } | |
275 | ||
276 | for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, area)) { | |
277 | if (IS_OSPF6_DEBUG_ABR) | |
278 | zlog_debug( | |
279 | "ospf_abr_announce_aggregates(): looking at area %pI4", | |
280 | &area->area_id); | |
281 | } | |
282 | ||
283 | if (IS_OSPF6_DEBUG_ABR) | |
284 | zlog_debug("ospf6_abr_announce_aggregates(): Stop"); | |
285 | } | |
286 | ||
287 | /* Flush the summary LSA's which are not approved.*/ | |
288 | void ospf6_abr_remove_unapproved_summaries(struct ospf6 *ospf6) | |
289 | { | |
290 | struct listnode *node, *nnode; | |
291 | struct ospf6_area *area; | |
292 | struct ospf6_lsa *lsa; | |
293 | uint16_t type; | |
294 | ||
295 | if (IS_OSPF6_DEBUG_ABR) | |
296 | zlog_debug("%s : Start", __func__); | |
297 | ||
298 | for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, area)) { | |
299 | if (IS_OSPF6_DEBUG_ABR) | |
300 | zlog_debug("%s : looking at area %pI4", __func__, | |
301 | &area->area_id); | |
302 | ||
303 | /* Inter area router LSA */ | |
304 | type = htons(OSPF6_LSTYPE_INTER_ROUTER); | |
305 | for (ALL_LSDB_TYPED_ADVRTR(area->lsdb, type, ospf6->router_id, | |
306 | lsa)) { | |
307 | if (CHECK_FLAG(lsa->flag, OSPF6_LSA_UNAPPROVED)) { | |
308 | lsa->header->age = htons(OSPF_LSA_MAXAGE); | |
309 | THREAD_OFF(lsa->refresh); | |
310 | thread_execute(master, ospf6_lsa_expire, lsa, | |
311 | 0); | |
312 | } | |
313 | } | |
314 | ||
315 | /* Inter area prefix LSA */ | |
316 | type = htons(OSPF6_LSTYPE_INTER_PREFIX); | |
317 | for (ALL_LSDB_TYPED_ADVRTR(area->lsdb, type, ospf6->router_id, | |
318 | lsa)) { | |
319 | if (CHECK_FLAG(lsa->flag, OSPF6_LSA_UNAPPROVED)) { | |
320 | lsa->header->age = htons(OSPF_LSA_MAXAGE); | |
321 | THREAD_OFF(lsa->refresh); | |
322 | thread_execute(master, ospf6_lsa_expire, lsa, | |
323 | 0); | |
324 | } | |
325 | } | |
326 | } | |
327 | ||
328 | if (IS_OSPF6_DEBUG_ABR) | |
329 | zlog_debug("%s : Stop", __func__); | |
330 | } | |
331 | ||
332 | /* | |
333 | * This is the function taking care about ABR stuff, i.e. | |
334 | * summary-LSA origination and flooding. | |
335 | */ | |
336 | static void ospf6_abr_task(struct ospf6 *ospf6) | |
337 | { | |
338 | if (IS_OSPF6_DEBUG_ABR) | |
339 | zlog_debug("%s : Start", __func__); | |
340 | ||
341 | if (ospf6->route_table == NULL || ospf6->brouter_table == NULL) { | |
342 | if (IS_OSPF6_DEBUG_ABR) | |
343 | zlog_debug("%s : Routing tables are not yet ready", | |
344 | __func__); | |
345 | return; | |
346 | } | |
347 | ||
348 | ospf6_abr_unapprove_summaries(ospf6); | |
349 | ||
350 | if (IS_OSPF6_DEBUG_ABR) | |
351 | zlog_debug("%s : prepare aggregates", __func__); | |
352 | ||
353 | ospf6_abr_range_reset_cost(ospf6); | |
354 | ||
355 | if (IS_OSPF6_ABR(ospf6)) { | |
356 | if (IS_OSPF6_DEBUG_ABR) | |
357 | zlog_debug("%s : process network RT", __func__); | |
358 | ospf6_abr_prefix_resummarize(ospf6); | |
359 | ||
360 | if (IS_OSPF6_DEBUG_ABR) | |
361 | zlog_debug("%s : process router RT", __func__); | |
362 | ospf6_asbr_prefix_readvertise(ospf6); | |
363 | ||
364 | if (IS_OSPF6_DEBUG_ABR) | |
365 | zlog_debug("%s : announce aggregates", __func__); | |
366 | ospf6_abr_announce_aggregates(ospf6); | |
367 | ||
368 | if (IS_OSPF6_DEBUG_ABR) | |
369 | zlog_debug("%s : announce stub defaults", __func__); | |
370 | ospf6_abr_defaults_to_stub(ospf6); | |
371 | } | |
372 | ||
373 | if (IS_OSPF6_DEBUG_ABR) | |
374 | zlog_debug("%s : remove unapproved summaries", __func__); | |
375 | ospf6_abr_remove_unapproved_summaries(ospf6); | |
376 | ||
377 | if (IS_OSPF6_DEBUG_ABR) | |
378 | zlog_debug("%s : Stop", __func__); | |
379 | } | |
380 | ||
381 | /* For NSSA Translations | |
382 | * Mark the translated LSA's as unapproved. */ | |
383 | static void ospf6_abr_unapprove_translates(struct ospf6 *ospf6) | |
384 | { | |
385 | struct ospf6_lsa *lsa; | |
386 | uint16_t type; | |
387 | struct ospf6_area *oa; | |
388 | struct listnode *node; | |
389 | ||
390 | if (IS_OSPF6_DEBUG_NSSA) | |
391 | zlog_debug("ospf6_abr_unapprove_translates(): Start"); | |
392 | ||
393 | type = htons(OSPF6_LSTYPE_AS_EXTERNAL); | |
394 | for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, oa)) { | |
395 | for (ALL_LSDB_TYPED(oa->lsdb, type, lsa)) { | |
396 | if (CHECK_FLAG(lsa->flag, OSPF6_LSA_LOCAL_XLT)) { | |
397 | SET_FLAG(lsa->flag, OSPF6_LSA_UNAPPROVED); | |
398 | if (IS_OSPF6_DEBUG_NSSA) | |
399 | zlog_debug( | |
400 | "%s : approved unset on link id %pI4", | |
401 | __func__, &lsa->header->id); | |
402 | } | |
403 | } | |
404 | } | |
405 | ||
406 | if (IS_OSPF6_DEBUG_NSSA) | |
407 | zlog_debug("ospf6_abr_unapprove_translates(): Stop"); | |
408 | } | |
409 | ||
410 | /* Generate the translated external lsa from NSSA lsa */ | |
411 | static struct ospf6_lsa *ospf6_lsa_translated_nssa_new(struct ospf6_area *area, | |
412 | struct ospf6_lsa *type7) | |
413 | { | |
414 | char *buffer; | |
415 | struct ospf6_lsa *lsa; | |
416 | struct ospf6_as_external_lsa *ext, *extnew; | |
417 | struct ospf6_lsa_header *lsa_header; | |
418 | caddr_t old_ptr, new_ptr; | |
419 | struct ospf6_as_external_lsa *nssa; | |
420 | struct prefix prefix; | |
421 | struct ospf6_route *match; | |
422 | struct ospf6 *ospf6 = area->ospf6; | |
423 | ptrdiff_t tag_offset = 0; | |
424 | route_tag_t network_order; | |
425 | ||
426 | if (IS_OSPF6_DEBUG_NSSA) | |
427 | zlog_debug("%s : Start", __func__); | |
428 | ||
429 | if (area->NSSATranslatorState == OSPF6_NSSA_TRANSLATE_DISABLED) { | |
430 | if (IS_OSPF6_DEBUG_NSSA) | |
431 | zlog_debug("%s: Translation disabled for area %s", | |
432 | __func__, area->name); | |
433 | return NULL; | |
434 | } | |
435 | ||
436 | buffer = XCALLOC(MTYPE_OSPF6_LSA, OSPF6_MAX_LSASIZE); | |
437 | lsa_header = (struct ospf6_lsa_header *)buffer; | |
438 | extnew = (struct ospf6_as_external_lsa | |
439 | *)((caddr_t)lsa_header | |
440 | + sizeof(struct ospf6_lsa_header)); | |
441 | ext = (struct ospf6_as_external_lsa | |
442 | *)((caddr_t)(type7->header) | |
443 | + sizeof(struct ospf6_lsa_header)); | |
444 | old_ptr = | |
445 | (caddr_t)((caddr_t)ext + sizeof(struct ospf6_as_external_lsa)); | |
446 | new_ptr = (caddr_t)((caddr_t)extnew | |
447 | + sizeof(struct ospf6_as_external_lsa)); | |
448 | ||
449 | memcpy(extnew, ext, sizeof(struct ospf6_as_external_lsa)); | |
450 | ||
451 | /* find the translated Type-5 for this Type-7 */ | |
452 | nssa = (struct ospf6_as_external_lsa *)OSPF6_LSA_HEADER_END( | |
453 | type7->header); | |
454 | ||
455 | prefix.family = AF_INET6; | |
456 | prefix.prefixlen = nssa->prefix.prefix_length; | |
457 | ospf6_prefix_in6_addr(&prefix.u.prefix6, nssa, &nssa->prefix); | |
458 | ||
459 | /* Find the LSA from the external route */ | |
460 | match = ospf6_route_lookup(&prefix, area->route_table); | |
461 | if (match == NULL) { | |
462 | if (IS_OSPF6_DEBUG_NSSA) | |
463 | zlog_debug("%s : no matching route %pFX", __func__, | |
464 | &prefix); | |
465 | return NULL; | |
466 | } | |
467 | ||
468 | /* set Prefix */ | |
469 | memcpy(new_ptr, old_ptr, OSPF6_PREFIX_SPACE(ext->prefix.prefix_length)); | |
470 | ospf6_prefix_apply_mask(&extnew->prefix); | |
471 | new_ptr += OSPF6_PREFIX_SPACE(extnew->prefix.prefix_length); | |
472 | ||
473 | tag_offset = | |
474 | sizeof(*ext) + OSPF6_PREFIX_SPACE(ext->prefix.prefix_length); | |
475 | ||
476 | /* Forwarding address */ | |
477 | if (CHECK_FLAG(ext->bits_metric, OSPF6_ASBR_BIT_F)) { | |
478 | memcpy(new_ptr, (caddr_t)ext + tag_offset, | |
479 | sizeof(struct in6_addr)); | |
480 | new_ptr += sizeof(struct in6_addr); | |
481 | tag_offset += sizeof(struct in6_addr); | |
482 | } | |
483 | /* External Route Tag */ | |
484 | if (CHECK_FLAG(ext->bits_metric, OSPF6_ASBR_BIT_T)) { | |
485 | memcpy(&network_order, (caddr_t)ext + tag_offset, | |
486 | sizeof(network_order)); | |
487 | network_order = htonl(network_order); | |
488 | memcpy(new_ptr, &network_order, sizeof(network_order)); | |
489 | new_ptr += sizeof(network_order); | |
490 | } | |
491 | ||
492 | /* Fill LSA Header */ | |
493 | lsa_header->age = 0; | |
494 | lsa_header->type = htons(OSPF6_LSTYPE_AS_EXTERNAL); | |
495 | lsa_header->id = htonl(ospf6->external_id); | |
496 | ospf6->external_id++; | |
497 | lsa_header->adv_router = ospf6->router_id; | |
498 | lsa_header->seqnum = | |
499 | ospf6_new_ls_seqnum(lsa_header->type, lsa_header->id, | |
500 | lsa_header->adv_router, ospf6->lsdb); | |
501 | lsa_header->length = htons((caddr_t)new_ptr - (caddr_t)lsa_header); | |
502 | type7->external_lsa_id = lsa_header->id; | |
503 | ||
504 | /* LSA checksum */ | |
505 | ospf6_lsa_checksum(lsa_header); | |
506 | ||
507 | /* create LSA */ | |
508 | lsa = ospf6_lsa_create(lsa_header); | |
509 | ||
510 | SET_FLAG(lsa->flag, OSPF6_LSA_LOCAL_XLT); | |
511 | UNSET_FLAG(lsa->flag, OSPF6_LSA_UNAPPROVED); | |
512 | ||
513 | /* Originate */ | |
514 | ospf6_lsa_originate_process(lsa, ospf6); | |
515 | ||
516 | if (IS_OSPF6_DEBUG_NSSA) | |
517 | zlog_debug("%s: Originated type5 LSA id %pI4", __func__, | |
518 | &lsa_header->id); | |
519 | return lsa; | |
520 | } | |
521 | ||
522 | /* Delete LSA from retransmission list */ | |
523 | static void ospf6_ls_retransmit_delete_nbr_as(struct ospf6 *ospf6, | |
524 | struct ospf6_lsa *lsa) | |
525 | { | |
526 | struct listnode *node, *nnode; | |
527 | struct ospf6_area *area; | |
528 | ||
529 | if (IS_OSPF6_DEBUG_NSSA) | |
530 | zlog_debug("%s : start lsa %s", __func__, lsa->name); | |
531 | ||
532 | /*The function ospf6_flood_clear_area removes LSA from | |
533 | * retransmit list. | |
534 | */ | |
535 | for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, area)) | |
536 | ospf6_flood_clear_area(lsa, area); | |
537 | ||
538 | if (IS_OSPF6_DEBUG_NSSA) | |
539 | zlog_debug("%s : finish lsa %s", __func__, lsa->name); | |
540 | } | |
541 | ||
542 | /* Refresh translated AS-external-LSA. */ | |
543 | struct ospf6_lsa *ospf6_translated_nssa_refresh(struct ospf6_area *area, | |
544 | struct ospf6_lsa *type7, | |
545 | struct ospf6_lsa *type5) | |
546 | { | |
547 | struct ospf6_lsa *new = NULL; | |
548 | struct ospf6_as_external_lsa *ext_lsa; | |
549 | struct prefix prefix; | |
550 | struct ospf6 *ospf6 = area->ospf6; | |
551 | ||
552 | if (IS_OSPF6_DEBUG_NSSA) | |
553 | zlog_debug("%s : start area %s", __func__, area->name); | |
554 | ||
555 | /* Sanity checks. */ | |
556 | assert(type7); | |
557 | ||
558 | /* Find the AS external LSA */ | |
559 | if (type5 == NULL) { | |
560 | if (IS_OSPF6_DEBUG_NSSA) | |
561 | zlog_debug( | |
562 | "%s: No translated Type-5 found for Type-7 with Id %pI4", | |
563 | __func__, &type7->header->id); | |
564 | ||
565 | /* find the translated Type-5 for this Type-7 */ | |
566 | ext_lsa = (struct ospf6_as_external_lsa *)OSPF6_LSA_HEADER_END( | |
567 | type7->header); | |
568 | ||
569 | prefix.family = AF_INET6; | |
570 | prefix.prefixlen = ext_lsa->prefix.prefix_length; | |
571 | ospf6_prefix_in6_addr(&prefix.u.prefix6, ext_lsa, | |
572 | &ext_lsa->prefix); | |
573 | ||
574 | /* Find the AS external LSA from Type-7 LSA */ | |
575 | if (IS_OSPF6_DEBUG_NSSA) | |
576 | zlog_debug("%s: try to find external LSA id %d", | |
577 | __func__, type7->external_lsa_id); | |
578 | type5 = ospf6_lsdb_lookup(htons(OSPF6_LSTYPE_AS_EXTERNAL), | |
579 | type7->external_lsa_id, | |
580 | ospf6->router_id, ospf6->lsdb); | |
581 | } | |
582 | ||
583 | if (type5) { | |
584 | if (CHECK_FLAG(type5->flag, OSPF6_LSA_LOCAL_XLT)) { | |
585 | /* Delete LSA from neighbor retransmit-list. */ | |
586 | ospf6_ls_retransmit_delete_nbr_as(ospf6, type5); | |
587 | ||
588 | /* Flush the LSA */ | |
589 | ospf6_lsa_premature_aging(type5); | |
590 | } else { | |
591 | if (IS_OSPF6_DEBUG_NSSA) | |
592 | zlog_debug("%s: Invalid translated LSA %s", | |
593 | __func__, type5->name); | |
594 | return NULL; | |
595 | } | |
596 | } | |
597 | ||
598 | /* create new translated LSA */ | |
599 | if (ospf6_lsa_age_current(type7) != OSPF_LSA_MAXAGE) { | |
600 | if ((new = ospf6_lsa_translated_nssa_new(area, type7)) | |
601 | == NULL) { | |
602 | if (IS_OSPF6_DEBUG_NSSA) | |
603 | zlog_debug( | |
604 | "%s: Could not translate Type-7 for %pI4", | |
605 | __func__, &type7->header->id); | |
606 | return NULL; | |
607 | } | |
608 | } | |
609 | ||
610 | if (IS_OSPF6_DEBUG_NSSA) | |
611 | zlog_debug("%s: finish", __func__); | |
612 | ||
613 | return new; | |
614 | } | |
615 | ||
616 | /* Originate Translated Type-5 for supplied Type-7 NSSA LSA */ | |
617 | struct ospf6_lsa *ospf6_translated_nssa_originate(struct ospf6_area *oa, | |
618 | struct ospf6_lsa *type7) | |
619 | { | |
620 | struct ospf6_lsa *new; | |
621 | ||
622 | if (ntohs(type7->header->type) != OSPF6_LSTYPE_TYPE_7) | |
623 | return NULL; | |
624 | ||
625 | if ((new = ospf6_lsa_translated_nssa_new(oa, type7)) == NULL) { | |
626 | if (IS_OSPF6_DEBUG_NSSA) | |
627 | zlog_debug( | |
628 | "%s : Could not translate Type-7, Id %pI4, to Type-5", | |
629 | __func__, &type7->header->id); | |
630 | return NULL; | |
631 | } | |
632 | ||
633 | return new; | |
634 | } | |
635 | ||
636 | int ospf6_abr_translate_nssa(struct ospf6_area *area, struct ospf6_lsa *lsa) | |
637 | { | |
638 | /* Incoming Type-7 or later aggregated Type-7 | |
639 | * | |
640 | * LSA is skipped if P-bit is off. | |
641 | * LSA is aggregated if within range. | |
642 | * | |
643 | * The Type-7 is translated, Installed/Approved as a Type-5 into | |
644 | * global LSDB, then Flooded through AS | |
645 | * | |
646 | * Later, any Unapproved Translated Type-5's are flushed/discarded | |
647 | */ | |
648 | ||
649 | struct ospf6_lsa *old = NULL, *new = NULL; | |
650 | struct ospf6_as_external_lsa *nssa_lsa; | |
651 | struct prefix prefix; | |
652 | struct ospf6_route *match; | |
653 | struct ospf6 *ospf6; | |
654 | ||
655 | ospf6 = area->ospf6; | |
656 | nssa_lsa = (struct ospf6_as_external_lsa *)OSPF6_LSA_HEADER_END( | |
657 | lsa->header); | |
658 | ||
659 | if (!CHECK_FLAG(nssa_lsa->prefix.prefix_options, | |
660 | OSPF6_PREFIX_OPTION_P)) { | |
661 | if (IS_OSPF6_DEBUG_NSSA) | |
662 | zlog_debug( | |
663 | "%s : LSA Id %pI4, P-bit off, NO Translation", | |
664 | __func__, &lsa->header->id); | |
665 | return 1; | |
666 | } | |
667 | ||
668 | if (IS_OSPF6_DEBUG_NSSA) | |
669 | zlog_debug( | |
670 | "%s : LSA Id %pI4 external ID %pI4, Translating type 7 to 5", | |
671 | __func__, &lsa->header->id, &lsa->external_lsa_id); | |
672 | ||
673 | prefix.family = AF_INET6; | |
674 | prefix.prefixlen = nssa_lsa->prefix.prefix_length; | |
675 | ospf6_prefix_in6_addr(&prefix.u.prefix6, nssa_lsa, &nssa_lsa->prefix); | |
676 | ||
677 | if (!CHECK_FLAG(nssa_lsa->bits_metric, OSPF6_ASBR_BIT_F)) { | |
678 | if (IS_OSPF6_DEBUG_NSSA) | |
679 | zlog_debug( | |
680 | "%s : LSA Id %pI4, Forward address is 0, NO Translation", | |
681 | __func__, &lsa->header->id); | |
682 | return 1; | |
683 | } | |
684 | ||
685 | /* Find the existing AS-External LSA for this prefix */ | |
686 | match = ospf6_route_lookup(&prefix, ospf6->external_table); | |
687 | if (match) { | |
688 | old = ospf6_lsdb_lookup(OSPF6_LSTYPE_AS_EXTERNAL, | |
689 | match->path.origin.id, ospf6->router_id, | |
690 | ospf6->lsdb); | |
691 | } | |
692 | ||
693 | /* Check Type 5 LSA using the matching external ID */ | |
694 | if (old == NULL) { | |
695 | old = ospf6_lsdb_lookup(htons(OSPF6_LSTYPE_AS_EXTERNAL), | |
696 | lsa->external_lsa_id, ospf6->router_id, | |
697 | ospf6->lsdb); | |
698 | } | |
699 | ||
700 | if (old) { | |
701 | /* Do not continue if type 5 LSA not approved */ | |
702 | if (CHECK_FLAG(old->flag, OSPF6_LSA_UNAPPROVED)) { | |
703 | if (IS_OSPF6_DEBUG_NSSA) | |
704 | zlog_debug( | |
705 | "%s : LSA Id %pI4 type 5 is not approved", | |
706 | __func__, &old->header->id); | |
707 | return 1; | |
708 | } | |
709 | ||
710 | if (IS_OSPF6_DEBUG_NSSA) | |
711 | zlog_debug( | |
712 | "%s : found old translated LSA Id %pI4, refreshing", | |
713 | __func__, &old->header->id); | |
714 | ||
715 | /* refresh */ | |
716 | new = ospf6_translated_nssa_refresh(area, lsa, old); | |
717 | if (!new) { | |
718 | if (IS_OSPF6_DEBUG_NSSA) | |
719 | zlog_debug( | |
720 | "%s : could not refresh translated LSA Id %pI4", | |
721 | __func__, &old->header->id); | |
722 | } | |
723 | } else { | |
724 | /* no existing external route for this LSA Id | |
725 | * originate translated LSA | |
726 | */ | |
727 | ||
728 | if (ospf6_translated_nssa_originate(area, lsa) == NULL) { | |
729 | if (IS_OSPF6_DEBUG_NSSA) | |
730 | zlog_debug( | |
731 | "%s : Could not translate Type-7 for %pI4 to Type-5", | |
732 | __func__, &lsa->header->id); | |
733 | return 1; | |
734 | } | |
735 | } | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
740 | static void ospf6_abr_process_nssa_translates(struct ospf6 *ospf6) | |
741 | { | |
742 | /* Scan through all NSSA_LSDB records for all areas; | |
743 | * If P-bit is on, translate all Type-7's to 5's and aggregate or\ | |
744 | * flood install as approved in Type-5 LSDB with XLATE Flag on | |
745 | * later, do same for all aggregates... At end, DISCARD all | |
746 | * remaining UNAPPROVED Type-5's (Aggregate is for future ) */ | |
747 | ||
748 | struct listnode *node; | |
749 | struct ospf6_area *oa; | |
750 | struct ospf6_lsa *lsa; | |
751 | int type; | |
752 | ||
753 | if (IS_OSPF6_DEBUG_NSSA) | |
754 | zlog_debug("%s : Start", __func__); | |
755 | ||
756 | for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, oa)) { | |
757 | ||
758 | /* skip if not translator */ | |
759 | if (oa->NSSATranslatorState == OSPF6_NSSA_TRANSLATE_DISABLED) { | |
760 | zlog_debug("%s area %pI4 NSSATranslatorState %d", | |
761 | __func__, &oa->area_id, | |
762 | oa->NSSATranslatorState); | |
763 | continue; | |
764 | } | |
765 | ||
766 | /* skip if not Nssa Area */ | |
767 | if (!IS_AREA_NSSA(oa)) { | |
768 | zlog_debug("%s area %pI4 Flag %x", __func__, | |
769 | &oa->area_id, oa->flag); | |
770 | continue; | |
771 | } | |
772 | ||
773 | if (IS_OSPF6_DEBUG_NSSA) | |
774 | zlog_debug("%s : looking at area %pI4", __func__, | |
775 | &oa->area_id); | |
776 | ||
777 | type = htons(OSPF6_LSTYPE_TYPE_7); | |
778 | for (ALL_LSDB_TYPED(oa->lsdb, type, lsa)) { | |
779 | zlog_debug("%s : lsa %s , id %pI4 , adv router %pI4", | |
780 | lsa->name, __func__, &lsa->header->id, | |
781 | &lsa->header->adv_router); | |
782 | ospf6_abr_translate_nssa(oa, lsa); | |
783 | } | |
784 | } | |
785 | ||
786 | if (IS_OSPF6_DEBUG_NSSA) | |
787 | zlog_debug("%s : Stop", __func__); | |
788 | } | |
789 | ||
790 | /* Generate translated type-5 LSA from the configured area ranges*/ | |
791 | static void ospf6_abr_translate_nssa_range(struct ospf6 *ospf6) | |
792 | { | |
793 | struct listnode *node, *nnode; | |
794 | struct ospf6_area *oa; | |
795 | struct ospf6_route *range; | |
796 | struct ospf6_lsa *lsa; | |
797 | ||
798 | for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, oa)) { | |
799 | for (range = ospf6_route_head(oa->range_table); range; | |
800 | range = ospf6_route_next(range)) { | |
801 | if (IS_OSPF6_DEBUG_NSSA) | |
802 | zlog_debug( | |
803 | "Translating range %pFX of area %pI4", | |
804 | &range->prefix, &oa->area_id); | |
805 | if (CHECK_FLAG(range->flag, | |
806 | OSPF6_ROUTE_DO_NOT_ADVERTISE)) | |
807 | continue; | |
808 | ||
809 | /* Find the NSSA LSA from the route */ | |
810 | /* Generate and flood external LSA */ | |
811 | lsa = ospf6_lsdb_lookup(OSPF6_LSTYPE_TYPE_7, | |
812 | range->path.origin.id, | |
813 | ospf6->router_id, oa->lsdb); | |
814 | if (lsa) | |
815 | ospf6_abr_translate_nssa(oa, lsa); | |
816 | } | |
817 | } | |
818 | } | |
819 | ||
820 | static void ospf6_abr_send_nssa_aggregates(struct ospf6 *ospf6) | |
821 | { | |
822 | struct listnode *node; | |
823 | struct ospf6_area *area; | |
824 | ||
825 | if (IS_OSPF6_DEBUG_NSSA) | |
826 | zlog_debug("%s : Start", __func__); | |
827 | ||
828 | for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, area)) { | |
829 | if (area->NSSATranslatorState == OSPF6_NSSA_TRANSLATE_DISABLED) | |
830 | continue; | |
831 | ||
832 | if (IS_OSPF6_DEBUG_NSSA) | |
833 | zlog_debug("%s : looking at area %pI4", __func__, | |
834 | &area->area_id); | |
835 | ||
836 | ospf6_abr_translate_nssa_range(ospf6); | |
837 | } | |
838 | ||
839 | if (IS_OSPF6_DEBUG_NSSA) | |
840 | zlog_debug("%s : Stop", __func__); | |
841 | } | |
842 | ||
843 | /*Flood max age LSA's for the unapproved LSA's */ | |
844 | static int ospf6_abr_remove_unapproved_translates_apply(struct ospf6_lsa *lsa) | |
845 | { | |
846 | if (CHECK_FLAG(lsa->flag, OSPF6_LSA_LOCAL_XLT) | |
847 | && CHECK_FLAG(lsa->flag, OSPF6_LSA_UNAPPROVED)) { | |
848 | zlog_debug("%s : removing unapproved translates, lsa : %s", | |
849 | __func__, lsa->name); | |
850 | ||
851 | /* FLUSH THROUGHOUT AS */ | |
852 | ospf6_lsa_premature_aging(lsa); | |
853 | } | |
854 | return 0; | |
855 | } | |
856 | ||
857 | static void ospf6_abr_remove_unapproved_translates(struct ospf6 *ospf6) | |
858 | { | |
859 | struct ospf6_lsa *lsa; | |
860 | uint16_t type; | |
861 | ||
862 | /* All AREA PROCESS should have APPROVED necessary LSAs */ | |
863 | /* Remove any left over and not APPROVED */ | |
864 | if (IS_OSPF6_DEBUG_NSSA) | |
865 | zlog_debug("ospf6_abr_remove_unapproved_translates(): Start"); | |
866 | ||
867 | type = htons(OSPF6_LSTYPE_AS_EXTERNAL); | |
868 | for (ALL_LSDB_TYPED(ospf6->lsdb, type, lsa)) | |
869 | ospf6_abr_remove_unapproved_translates_apply(lsa); | |
870 | ||
871 | if (IS_OSPF6_DEBUG_NSSA) | |
872 | zlog_debug("ospf_abr_remove_unapproved_translates(): Stop"); | |
873 | } | |
874 | ||
875 | static void ospf6_abr_nssa_task(struct ospf6 *ospf6) | |
876 | { | |
877 | /* called only if any_nssa */ | |
878 | struct ospf6_route *range; | |
879 | struct ospf6_area *area; | |
880 | struct listnode *node, *nnode; | |
881 | ||
882 | if (IS_OSPF6_DEBUG_NSSA) | |
883 | zlog_debug("Check for NSSA-ABR Tasks():"); | |
884 | ||
885 | if (!IS_OSPF6_ABR(ospf6)) { | |
886 | if (IS_OSPF6_DEBUG_NSSA) | |
887 | zlog_debug("%s Not ABR", __func__); | |
888 | return; | |
889 | } | |
890 | ||
891 | if (!ospf6->anyNSSA) { | |
892 | if (IS_OSPF6_DEBUG_NSSA) | |
893 | zlog_debug("%s Not NSSA", __func__); | |
894 | return; | |
895 | } | |
896 | ||
897 | /* Each area must confirm TranslatorRole */ | |
898 | if (IS_OSPF6_DEBUG_NSSA) | |
899 | zlog_debug("ospf6_abr_nssa_task(): Start"); | |
900 | ||
901 | /* For all Global Entries flagged "local-translate", unset APPROVED */ | |
902 | if (IS_OSPF6_DEBUG_NSSA) | |
903 | zlog_debug("ospf6_abr_nssa_task(): unapprove translates"); | |
904 | ||
905 | ospf6_abr_unapprove_translates(ospf6); | |
906 | ||
907 | /* RESET all Ranges in every Area, same as summaries */ | |
908 | if (IS_OSPF6_DEBUG_NSSA) | |
909 | zlog_debug("ospf6_abr_nssa_task(): NSSA initialize aggregates"); | |
910 | ospf6_abr_range_reset_cost(ospf6); | |
911 | ||
912 | /* For all NSSAs, Type-7s, translate to 5's, INSTALL/FLOOD, or | |
913 | * Aggregate as Type-7 | |
914 | * Install or Approve in Type-5 Global LSDB | |
915 | */ | |
916 | if (IS_OSPF6_DEBUG_NSSA) | |
917 | zlog_debug("ospf6_abr_nssa_task(): process translates"); | |
918 | ospf6_abr_process_nssa_translates(ospf6); | |
919 | ||
920 | /* Translate/Send any "ranged" aggregates, and also 5-Install and | |
921 | * Approve | |
922 | * Scan Type-7's for aggregates, translate to Type-5's, | |
923 | * Install/Flood/Approve | |
924 | */ | |
925 | if (IS_OSPF6_DEBUG_NSSA) | |
926 | zlog_debug("ospf6_abr_nssa_task(): send NSSA aggregates"); | |
927 | ospf6_abr_send_nssa_aggregates(ospf6); /*TURNED OFF FOR NOW */ | |
928 | ||
929 | /* Flush any unapproved previous translates from Global Data Base */ | |
930 | if (IS_OSPF6_DEBUG_NSSA) | |
931 | zlog_debug( | |
932 | "ospf6_abr_nssa_task(): remove unapproved translates"); | |
933 | ospf6_abr_remove_unapproved_translates(ospf6); | |
934 | ||
935 | for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, area)) { | |
936 | for (range = ospf6_route_head(area->range_table); range; | |
937 | range = ospf6_route_next(range)) { | |
938 | if (CHECK_FLAG(range->flag, | |
939 | OSPF6_ROUTE_DO_NOT_ADVERTISE)) | |
940 | ospf6_zebra_delete_discard(range, ospf6); | |
941 | else | |
942 | ospf6_zebra_add_discard(range, ospf6); | |
943 | } | |
944 | } | |
945 | ||
946 | if (IS_OSPF6_DEBUG_NSSA) | |
947 | zlog_debug("ospf6_abr_nssa_task(): Stop"); | |
948 | } | |
949 | ||
950 | int ospf6_redistribute_check(struct ospf6 *ospf6, struct ospf6_route *route, | |
951 | int type) | |
952 | { | |
953 | route_map_result_t ret; | |
954 | struct prefix *prefix; | |
955 | struct ospf6_redist *red; | |
956 | ||
957 | if (!ospf6_zebra_is_redistribute(type, ospf6->vrf_id)) | |
958 | return 0; | |
959 | ||
960 | prefix = &route->prefix; | |
961 | ||
962 | red = ospf6_redist_lookup(ospf6, type, 0); | |
963 | if (!red) | |
964 | return 0; | |
965 | ||
966 | /* Change to new redist structure */ | |
967 | if (ROUTEMAP_NAME(red)) { | |
968 | if (ROUTEMAP(red) == NULL) | |
969 | ospf6_asbr_routemap_update(NULL); | |
970 | if (ROUTEMAP(red) == NULL) { | |
971 | zlog_warn( | |
972 | "route-map \"%s\" not found, suppress redistributing", | |
973 | ROUTEMAP_NAME(red)); | |
974 | return 0; | |
975 | } | |
976 | } | |
977 | ||
978 | /* Change to new redist structure */ | |
979 | if (ROUTEMAP(red)) { | |
980 | ret = route_map_apply(ROUTEMAP(red), prefix, route); | |
981 | if (ret == RMAP_DENYMATCH) { | |
982 | if (IS_OSPF6_DEBUG_ASBR) | |
983 | zlog_debug("Denied by route-map \"%s\"", | |
984 | ROUTEMAP_NAME(red)); | |
985 | return 0; | |
986 | } | |
987 | } | |
988 | ||
989 | return 1; | |
990 | } | |
991 | ||
992 | static void ospf6_external_lsa_refresh_type(struct ospf6 *ospf6, uint8_t type, | |
993 | unsigned short instance, int force) | |
994 | { | |
995 | struct ospf6_route *route; | |
996 | struct ospf6_external_info *info; | |
997 | struct ospf6_lsa *lsa; | |
998 | ||
999 | if (type == ZEBRA_ROUTE_MAX) | |
1000 | return; | |
1001 | ||
1002 | for (route = ospf6_route_head(ospf6->external_table); route; | |
1003 | route = ospf6_route_next(route)) { | |
1004 | info = route->route_option; | |
1005 | ||
1006 | /* Find the external LSA in the database */ | |
1007 | if (!is_default_prefix(&route->prefix)) { | |
1008 | lsa = ospf6_lsdb_lookup(htons(OSPF6_LSTYPE_AS_EXTERNAL), | |
1009 | htonl(info->id), | |
1010 | ospf6->router_id, ospf6->lsdb); | |
1011 | ||
1012 | if (lsa) { | |
1013 | THREAD_OFF(lsa->refresh); | |
1014 | ||
1015 | /* LSA is maxage, immediate refresh */ | |
1016 | if (OSPF6_LSA_IS_MAXAGE(lsa)) | |
1017 | ospf6_flood(NULL, lsa); | |
1018 | else | |
1019 | thread_add_timer(master, | |
1020 | ospf6_lsa_refresh, lsa, | |
1021 | OSPF_LS_REFRESH_TIME, | |
1022 | &lsa->refresh); | |
1023 | } else { | |
1024 | /* LSA not found in the database | |
1025 | * Verify and originate external LSA | |
1026 | */ | |
1027 | if (ospf6_redistribute_check(ospf6, route, | |
1028 | type)) | |
1029 | ospf6_as_external_lsa_originate(route, | |
1030 | ospf6); | |
1031 | } | |
1032 | } | |
1033 | } | |
1034 | } | |
1035 | ||
1036 | /* Refresh default route */ | |
1037 | static void ospf6_external_lsa_refresh_default(struct ospf6 *ospf6) | |
1038 | { | |
1039 | struct ospf6_route *route; | |
1040 | struct ospf6_external_info *info; | |
1041 | struct ospf6_lsa *lsa; | |
1042 | ||
1043 | for (route = ospf6_route_head(ospf6->external_table); route; | |
1044 | route = ospf6_route_next(route)) { | |
1045 | if (is_default_prefix(&route->prefix)) { | |
1046 | info = route->route_option; | |
1047 | lsa = ospf6_lsdb_lookup(htons(OSPF6_LSTYPE_AS_EXTERNAL), | |
1048 | htonl(info->id), | |
1049 | ospf6->router_id, ospf6->lsdb); | |
1050 | ||
1051 | if (lsa) { | |
1052 | if (IS_OSPF6_DEBUG_NSSA) | |
1053 | zlog_debug( | |
1054 | "LSA[Type5:0.0.0.0]: Refresh AS-external-LSA %p", | |
1055 | (void *)lsa); | |
1056 | if (OSPF6_LSA_IS_MAXAGE(lsa)) | |
1057 | ospf6_flood(NULL, lsa); | |
1058 | else | |
1059 | thread_add_timer(master, | |
1060 | ospf6_lsa_refresh, lsa, | |
1061 | OSPF_LS_REFRESH_TIME, | |
1062 | &lsa->refresh); | |
1063 | } else if (!lsa) { | |
1064 | if (IS_OSPF6_DEBUG_NSSA) | |
1065 | zlog_debug( | |
1066 | "LSA[Type5:0.0.0.0]: Originate AS-external-LSA"); | |
1067 | ospf6_as_external_lsa_originate(route, ospf6); | |
1068 | } | |
1069 | } | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | /* If there's redistribution configured, we need to refresh external | |
1074 | * LSAs in order to install Type-7 and flood to all NSSA Areas | |
1075 | */ | |
1076 | void ospf6_asbr_nssa_redist_task(struct ospf6 *ospf6) | |
1077 | { | |
1078 | int type; | |
1079 | struct ospf6_redist *red; | |
1080 | ||
1081 | for (type = 0; type < ZEBRA_ROUTE_MAX; type++) { | |
1082 | red = ospf6_redist_lookup(ospf6, type, 0); | |
1083 | if (!red) | |
1084 | return; | |
1085 | ||
1086 | ospf6_external_lsa_refresh_type(ospf6, type, red->instance, | |
1087 | LSA_REFRESH_IF_CHANGED); | |
1088 | } | |
1089 | ospf6_external_lsa_refresh_default(ospf6); | |
1090 | } | |
1091 | ||
1092 | /* This function performs ABR related processing */ | |
1093 | static int ospf6_abr_task_timer(struct thread *thread) | |
1094 | { | |
1095 | struct ospf6 *ospf6 = THREAD_ARG(thread); | |
1096 | ||
1097 | ospf6->t_abr_task = NULL; | |
1098 | ||
1099 | if (IS_OSPF6_DEBUG_ABR) | |
1100 | zlog_debug("Running ABR task on timer"); | |
1101 | ||
95b3f03d | 1102 | (void)ospf6_check_and_set_router_abr(ospf6); |
ad500b22 K |
1103 | ospf6_abr_nssa_check_status(ospf6); |
1104 | ospf6_abr_task(ospf6); | |
1105 | /* if nssa-abr, then scan Type-7 LSDB */ | |
1106 | ospf6_abr_nssa_task(ospf6); | |
1107 | ospf6_asbr_nssa_redist_task(ospf6); | |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | void ospf6_schedule_abr_task(struct ospf6 *ospf6) | |
1113 | { | |
1114 | if (ospf6->t_abr_task) { | |
1115 | if (IS_OSPF6_DEBUG_ABR) | |
1116 | zlog_debug("ABR task already scheduled"); | |
1117 | return; | |
1118 | } | |
1119 | ||
1120 | if (IS_OSPF6_DEBUG_ABR) | |
1121 | zlog_debug("Scheduling ABR task"); | |
1122 | ||
1123 | thread_add_timer(master, ospf6_abr_task_timer, ospf6, | |
1124 | OSPF6_ABR_TASK_DELAY, &ospf6->t_abr_task); | |
1125 | } | |
1126 | ||
1127 | /* Flush the NSSA LSAs from the area */ | |
1128 | static void ospf6_nssa_flush_area(struct ospf6_area *area) | |
1129 | { | |
1130 | uint16_t type; | |
1131 | struct ospf6_lsa *lsa = NULL, *type5 = NULL; | |
1132 | struct ospf6 *ospf6 = area->ospf6; | |
ad500b22 K |
1133 | |
1134 | if (IS_OSPF6_DEBUG_NSSA) | |
1135 | zlog_debug("%s: area %s", __func__, area->name); | |
1136 | ||
1137 | /* Flush the NSSA LSA */ | |
1138 | type = htons(OSPF6_LSTYPE_TYPE_7); | |
ccfffce4 | 1139 | for (ALL_LSDB_TYPED_ADVRTR(area->lsdb, type, ospf6->router_id, lsa)) { |
ad500b22 K |
1140 | lsa->header->age = htons(OSPF_LSA_MAXAGE); |
1141 | SET_FLAG(lsa->flag, OSPF6_LSA_FLUSH); | |
1142 | ospf6_flood(NULL, lsa); | |
ccfffce4 | 1143 | |
ad500b22 | 1144 | /* Flush the translated LSA */ |
95b3f03d | 1145 | if (ospf6_check_and_set_router_abr(ospf6)) { |
ad500b22 K |
1146 | type = htons(OSPF6_LSTYPE_AS_EXTERNAL); |
1147 | type5 = ospf6_lsdb_lookup( | |
1148 | htons(type), lsa->external_lsa_id, | |
1149 | ospf6->router_id, ospf6->lsdb); | |
1150 | if (type5 | |
1151 | && CHECK_FLAG(type5->flag, OSPF6_LSA_LOCAL_XLT)) { | |
1152 | type5->header->age = htons(OSPF_LSA_MAXAGE); | |
1153 | SET_FLAG(type5->flag, OSPF6_LSA_FLUSH); | |
1154 | ospf6_flood(NULL, type5); | |
1155 | } | |
1156 | } | |
ad500b22 K |
1157 | } |
1158 | } | |
1159 | ||
c3a70f65 | 1160 | static void ospf6_check_and_originate_type7_lsa(struct ospf6_area *area) |
ad500b22 K |
1161 | { |
1162 | struct ospf6_route *route; | |
c3a70f65 | 1163 | struct route_node *rn = NULL; |
c3a70f65 MR |
1164 | struct ospf6_external_aggr_rt *aggr; |
1165 | ||
1166 | /* Loop through the external_table to find the LSAs originated | |
1167 | * without aggregation and originate type-7 LSAs for them. | |
1168 | */ | |
1169 | for (route = ospf6_route_head( | |
1170 | area->ospf6->external_table); | |
1171 | route; route = ospf6_route_next(route)) { | |
210429c7 RW |
1172 | struct ospf6_external_info *info = route->route_option; |
1173 | ||
c3a70f65 | 1174 | /* This means the Type-5 LSA was originated for this route */ |
210429c7 | 1175 | if (route->path.origin.id != 0 && info->type != DEFAULT_ROUTE) |
c3a70f65 | 1176 | ospf6_nssa_lsa_originate(route, area); |
c3a70f65 | 1177 | } |
ad500b22 | 1178 | |
c3a70f65 MR |
1179 | /* Loop through the aggregation table to originate type-7 LSAs |
1180 | * for the aggregated type-5 LSAs | |
1181 | */ | |
1182 | for (rn = route_top(area->ospf6->rt_aggr_tbl); rn; | |
1183 | rn = route_next(rn)) { | |
1184 | if (!rn->info) | |
1185 | continue; | |
ad500b22 | 1186 | |
c3a70f65 MR |
1187 | aggr = rn->info; |
1188 | ||
1189 | if (CHECK_FLAG(aggr->aggrflags, | |
1190 | OSPF6_EXTERNAL_AGGRT_ORIGINATED)) { | |
c405b00f MR |
1191 | if (IS_OSPF6_DEBUG_NSSA) |
1192 | zlog_debug( | |
1193 | "Originating Type-7 LSAs for area %s", | |
1194 | area->name); | |
1195 | ||
1196 | ospf6_nssa_lsa_originate(aggr->route, area); | |
c3a70f65 MR |
1197 | } |
1198 | } | |
1199 | ||
1200 | } | |
1201 | ||
0c293b92 | 1202 | void ospf6_area_nssa_update(struct ospf6_area *area) |
c3a70f65 | 1203 | { |
ad500b22 | 1204 | if (IS_AREA_NSSA(area)) { |
d36a6a19 | 1205 | OSPF6_OPT_CLEAR(area->options, OSPF6_OPT_E); |
ad500b22 K |
1206 | area->ospf6->anyNSSA++; |
1207 | OSPF6_OPT_SET(area->options, OSPF6_OPT_N); | |
1208 | area->NSSATranslatorRole = OSPF6_NSSA_ROLE_CANDIDATE; | |
1209 | } else if (IS_AREA_ENABLED(area)) { | |
1210 | if (IS_OSPF6_DEBUG_ORIGINATE(ROUTER)) | |
1211 | zlog_debug("Normal area for if %s", area->name); | |
1212 | OSPF6_OPT_CLEAR(area->options, OSPF6_OPT_N); | |
d36a6a19 | 1213 | OSPF6_OPT_SET(area->options, OSPF6_OPT_E); |
ad500b22 K |
1214 | area->ospf6->anyNSSA--; |
1215 | area->NSSATranslatorState = OSPF6_NSSA_TRANSLATE_DISABLED; | |
1216 | } | |
1217 | ||
1218 | /* Refresh router LSA */ | |
1219 | if (IS_AREA_NSSA(area)) { | |
1220 | OSPF6_ROUTER_LSA_SCHEDULE(area); | |
1221 | ||
dd551b9d RW |
1222 | /* Flush external LSAs. */ |
1223 | ospf6_asbr_remove_externals_from_area(area); | |
1224 | ||
ad500b22 | 1225 | /* Check if router is ABR */ |
95b3f03d | 1226 | if (ospf6_check_and_set_router_abr(area->ospf6)) { |
ad500b22 K |
1227 | if (IS_OSPF6_DEBUG_NSSA) |
1228 | zlog_debug("Router is ABR area %s", area->name); | |
1229 | ospf6_schedule_abr_task(area->ospf6); | |
1230 | } else { | |
1231 | /* Router is not ABR */ | |
1232 | if (IS_OSPF6_DEBUG_NSSA) | |
1233 | zlog_debug("NSSA area %s", area->name); | |
1234 | ||
1235 | /* Originate NSSA LSA */ | |
c3a70f65 | 1236 | ospf6_check_and_originate_type7_lsa(area); |
ad500b22 K |
1237 | } |
1238 | } else { | |
1239 | /* Disable NSSA */ | |
1240 | if (IS_OSPF6_DEBUG_NSSA) | |
1241 | zlog_debug("Normal area %s", area->name); | |
1242 | ospf6_nssa_flush_area(area); | |
ad500b22 K |
1243 | } |
1244 | } | |
1245 | ||
1246 | int ospf6_area_nssa_set(struct ospf6 *ospf6, struct ospf6_area *area) | |
1247 | { | |
1248 | ||
1249 | if (!IS_AREA_NSSA(area)) { | |
0c293b92 RW |
1250 | /* Disable stub first. */ |
1251 | ospf6_area_stub_unset(ospf6, area); | |
1252 | ||
ad500b22 K |
1253 | SET_FLAG(area->flag, OSPF6_AREA_NSSA); |
1254 | if (IS_OSPF6_DEBUG_NSSA) | |
1255 | zlog_debug("area %s nssa set", area->name); | |
1256 | ospf6_area_nssa_update(area); | |
1257 | } | |
1258 | ||
1259 | return 1; | |
1260 | } | |
1261 | ||
1262 | int ospf6_area_nssa_unset(struct ospf6 *ospf6, struct ospf6_area *area) | |
1263 | { | |
1264 | if (IS_AREA_NSSA(area)) { | |
1265 | UNSET_FLAG(area->flag, OSPF6_AREA_NSSA); | |
1266 | if (IS_OSPF6_DEBUG_NSSA) | |
1267 | zlog_debug("area %s nssa reset", area->name); | |
1268 | ospf6_area_nssa_update(area); | |
1269 | } | |
1270 | ||
1271 | return 1; | |
1272 | } | |
1273 | ||
1274 | /* Find the NSSA forwarding address */ | |
1275 | static struct in6_addr *ospf6_get_nssa_fwd_addr(struct ospf6_area *oa) | |
1276 | { | |
1277 | struct listnode *node, *nnode; | |
1278 | struct ospf6_interface *oi; | |
1279 | ||
1280 | for (ALL_LIST_ELEMENTS(oa->if_list, node, nnode, oi)) { | |
1281 | if (if_is_operative(oi->interface)) | |
1282 | if (oi->area && IS_AREA_NSSA(oi->area)) | |
1283 | return ospf6_interface_get_global_address( | |
1284 | oi->interface); | |
1285 | } | |
1286 | return NULL; | |
1287 | } | |
1288 | ||
1289 | void ospf6_nssa_lsa_originate(struct ospf6_route *route, | |
1290 | struct ospf6_area *area) | |
1291 | { | |
1292 | char buffer[OSPF6_MAX_LSASIZE]; | |
1293 | struct ospf6_lsa_header *lsa_header; | |
1294 | struct ospf6_lsa *lsa; | |
1295 | struct ospf6_external_info *info = route->route_option; | |
1296 | struct in6_addr *fwd_addr; | |
1297 | ||
1298 | struct ospf6_as_external_lsa *as_external_lsa; | |
ad500b22 K |
1299 | caddr_t p; |
1300 | ||
96cad171 MR |
1301 | if (IS_OSPF6_DEBUG_ASBR || IS_OSPF6_DEBUG_ORIGINATE(AS_EXTERNAL)) |
1302 | zlog_debug("Originate NSSA-LSA for %pFX", &route->prefix); | |
ad500b22 K |
1303 | |
1304 | /* prepare buffer */ | |
1305 | memset(buffer, 0, sizeof(buffer)); | |
1306 | lsa_header = (struct ospf6_lsa_header *)buffer; | |
1307 | as_external_lsa = (struct ospf6_as_external_lsa | |
1308 | *)((caddr_t)lsa_header | |
1309 | + sizeof(struct ospf6_lsa_header)); | |
1310 | p = (caddr_t)((caddr_t)as_external_lsa | |
1311 | + sizeof(struct ospf6_as_external_lsa)); | |
1312 | ||
1313 | /* Fill AS-External-LSA */ | |
1314 | /* Metric type */ | |
242a9767 | 1315 | if (route->path.metric_type == 2) |
ad500b22 K |
1316 | SET_FLAG(as_external_lsa->bits_metric, OSPF6_ASBR_BIT_E); |
1317 | else | |
1318 | UNSET_FLAG(as_external_lsa->bits_metric, OSPF6_ASBR_BIT_E); | |
1319 | ||
1320 | /* external route tag */ | |
1321 | if (info->tag) | |
1322 | SET_FLAG(as_external_lsa->bits_metric, OSPF6_ASBR_BIT_T); | |
1323 | else | |
1324 | UNSET_FLAG(as_external_lsa->bits_metric, OSPF6_ASBR_BIT_T); | |
1325 | ||
1326 | /* Set metric */ | |
1327 | OSPF6_ASBR_METRIC_SET(as_external_lsa, route->path.cost); | |
1328 | ||
1329 | /* prefixlen */ | |
1330 | as_external_lsa->prefix.prefix_length = route->prefix.prefixlen; | |
1331 | ||
1332 | /* PrefixOptions */ | |
4699ad72 | 1333 | as_external_lsa->prefix.prefix_options = route->prefix_options; |
ad500b22 K |
1334 | |
1335 | /* Set the P bit */ | |
1336 | as_external_lsa->prefix.prefix_options |= OSPF6_PREFIX_OPTION_P; | |
1337 | ||
1338 | /* don't use refer LS-type */ | |
1339 | as_external_lsa->prefix.prefix_refer_lstype = htons(0); | |
1340 | ||
1341 | /* set Prefix */ | |
1342 | memcpy(p, &route->prefix.u.prefix6, | |
1343 | OSPF6_PREFIX_SPACE(route->prefix.prefixlen)); | |
1344 | ospf6_prefix_apply_mask(&as_external_lsa->prefix); | |
1345 | p += OSPF6_PREFIX_SPACE(route->prefix.prefixlen); | |
1346 | ||
1347 | /* Forwarding address */ | |
1348 | fwd_addr = ospf6_get_nssa_fwd_addr(area); | |
1349 | if (fwd_addr) { | |
1350 | memcpy(p, fwd_addr, sizeof(struct in6_addr)); | |
1351 | p += sizeof(struct in6_addr); | |
1352 | SET_FLAG(as_external_lsa->bits_metric, OSPF6_ASBR_BIT_F); | |
1353 | } else | |
1354 | UNSET_FLAG(as_external_lsa->bits_metric, OSPF6_ASBR_BIT_F); | |
1355 | ||
1356 | /* External Route Tag */ | |
1357 | if (CHECK_FLAG(as_external_lsa->bits_metric, OSPF6_ASBR_BIT_T)) { | |
1358 | route_tag_t network_order = htonl(info->tag); | |
1359 | ||
1360 | memcpy(p, &network_order, sizeof(network_order)); | |
1361 | p += sizeof(network_order); | |
1362 | } | |
1363 | ||
1364 | /* Fill LSA Header */ | |
1365 | lsa_header->age = 0; | |
1366 | lsa_header->type = htons(OSPF6_LSTYPE_TYPE_7); | |
1367 | lsa_header->id = route->path.origin.id; | |
1368 | lsa_header->adv_router = area->ospf6->router_id; | |
1369 | lsa_header->seqnum = | |
1370 | ospf6_new_ls_seqnum(lsa_header->type, lsa_header->id, | |
96cad171 | 1371 | lsa_header->adv_router, area->lsdb); |
ad500b22 K |
1372 | lsa_header->length = htons((caddr_t)p - (caddr_t)lsa_header); |
1373 | ||
1374 | /* LSA checksum */ | |
1375 | ospf6_lsa_checksum(lsa_header); | |
1376 | /* create LSA */ | |
1377 | lsa = ospf6_lsa_create(lsa_header); | |
1378 | ||
1379 | /* Originate */ | |
1380 | ospf6_lsa_originate_area(lsa, area); | |
1381 | } | |
1382 | ||
1383 | void ospf6_abr_check_translate_nssa(struct ospf6_area *area, | |
1384 | struct ospf6_lsa *lsa) | |
1385 | { | |
1386 | struct ospf6_lsa *type5 = NULL; | |
1387 | struct ospf6 *ospf6 = area->ospf6; | |
1388 | ||
1389 | if (IS_OSPF6_DEBUG_NSSA) | |
1390 | zlog_debug("%s : start", __func__); | |
1391 | ||
1392 | type5 = ospf6_lsdb_lookup(htons(OSPF6_LSTYPE_AS_EXTERNAL), | |
1393 | lsa->external_lsa_id, ospf6->router_id, | |
1394 | ospf6->lsdb); | |
1395 | ||
95b3f03d | 1396 | if (ospf6_check_and_set_router_abr(ospf6) && (type5 == NULL)) { |
ad500b22 K |
1397 | if (IS_OSPF6_DEBUG_NSSA) |
1398 | zlog_debug("%s : Originating type5 LSA", __func__); | |
1399 | ospf6_lsa_translated_nssa_new(area, lsa); | |
1400 | } | |
1401 | } | |
1402 | ||
1403 | DEFUN(debug_ospf6_nssa, debug_ospf6_nssa_cmd, | |
1404 | "debug ospf6 nssa", | |
1405 | DEBUG_STR | |
1406 | OSPF6_STR | |
1407 | "Debug OSPFv3 NSSA function\n") | |
1408 | { | |
1409 | OSPF6_DEBUG_NSSA_ON(); | |
1410 | return CMD_SUCCESS; | |
1411 | } | |
1412 | ||
1413 | DEFUN(no_debug_ospf6_nssa, no_debug_ospf6_nssa_cmd, | |
1414 | "no debug ospf6 nssa", | |
1415 | NO_STR | |
1416 | DEBUG_STR | |
1417 | OSPF6_STR | |
1418 | "Debug OSPFv3 NSSA function\n") | |
1419 | { | |
1420 | OSPF6_DEBUG_NSSA_OFF(); | |
1421 | return CMD_SUCCESS; | |
1422 | } | |
1423 | ||
1424 | void config_write_ospf6_debug_nssa(struct vty *vty) | |
1425 | { | |
1426 | if (IS_OSPF6_DEBUG_NSSA) | |
1427 | vty_out(vty, "debug ospf6 nssa\n"); | |
1428 | } | |
1429 | ||
1430 | void install_element_ospf6_debug_nssa(void) | |
1431 | { | |
1432 | install_element(ENABLE_NODE, &debug_ospf6_nssa_cmd); | |
1433 | install_element(ENABLE_NODE, &no_debug_ospf6_nssa_cmd); | |
1434 | install_element(CONFIG_NODE, &debug_ospf6_nssa_cmd); | |
1435 | install_element(CONFIG_NODE, &no_debug_ospf6_nssa_cmd); | |
1436 | } |