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718e3744 | 1 | /* |
2 | * OSPF AS external route calculation. | |
3 | * Copyright (C) 1999, 2000 Alex Zinin, Toshiaki Takada | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "thread.h" | |
26 | #include "memory.h" | |
27 | #include "hash.h" | |
28 | #include "linklist.h" | |
29 | #include "prefix.h" | |
30 | #include "if.h" | |
31 | #include "table.h" | |
32 | #include "vty.h" | |
33 | #include "log.h" | |
34 | ||
35 | #include "ospfd/ospfd.h" | |
36 | #include "ospfd/ospf_interface.h" | |
37 | #include "ospfd/ospf_ism.h" | |
38 | #include "ospfd/ospf_asbr.h" | |
39 | #include "ospfd/ospf_lsa.h" | |
40 | #include "ospfd/ospf_lsdb.h" | |
41 | #include "ospfd/ospf_neighbor.h" | |
42 | #include "ospfd/ospf_nsm.h" | |
43 | #include "ospfd/ospf_spf.h" | |
44 | #include "ospfd/ospf_route.h" | |
45 | #include "ospfd/ospf_ase.h" | |
46 | #include "ospfd/ospf_zebra.h" | |
47 | #include "ospfd/ospf_dump.h" | |
48 | ||
49 | #define DEBUG | |
50 | ||
51 | struct ospf_route * | |
68980084 | 52 | ospf_find_asbr_route (struct ospf *ospf, |
53 | struct route_table *rtrs, struct prefix_ipv4 *asbr) | |
718e3744 | 54 | { |
55 | struct route_node *rn; | |
56 | struct ospf_route *or, *best = NULL; | |
57 | listnode node; | |
58 | list chosen; | |
59 | ||
60 | /* Sanity check. */ | |
61 | if (rtrs == NULL) | |
62 | return NULL; | |
63 | ||
64 | rn = route_node_lookup (rtrs, (struct prefix *) asbr); | |
65 | if (! rn) | |
66 | return NULL; | |
67 | ||
68 | route_unlock_node (rn); | |
69 | ||
70 | chosen = list_new (); | |
71 | ||
72 | /* First try to find intra-area non-bb paths. */ | |
68980084 | 73 | if (!CHECK_FLAG (ospf->config, OSPF_RFC1583_COMPATIBLE)) |
718e3744 | 74 | for (node = listhead ((list) rn->info); node; nextnode (node)) |
75 | if ((or = getdata (node)) != NULL) | |
76 | if (or->cost < OSPF_LS_INFINITY) | |
77 | if (!OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id) && | |
78 | or->path_type == OSPF_PATH_INTRA_AREA) | |
79 | listnode_add (chosen, or); | |
80 | ||
81 | /* If none is found -- look through all. */ | |
82 | if (listcount (chosen) == 0) | |
83 | { | |
84 | list_free (chosen); | |
85 | chosen = rn->info; | |
86 | } | |
87 | ||
88 | /* Now find the route with least cost. */ | |
89 | for (node = listhead (chosen); node; nextnode (node)) | |
90 | if ((or = getdata (node)) != NULL) | |
91 | if (or->cost < OSPF_LS_INFINITY) | |
92 | { | |
93 | if (best == NULL) | |
94 | best = or; | |
95 | else if (best->cost > or->cost) | |
96 | best = or; | |
97 | else if (best->cost == or->cost && | |
98 | IPV4_ADDR_CMP (&best->u.std.area_id, | |
99 | &or->u.std.area_id) < 0) | |
100 | best = or; | |
101 | } | |
102 | ||
103 | if (chosen != rn->info) | |
104 | list_delete (chosen); | |
105 | ||
106 | return best; | |
107 | } | |
108 | ||
109 | struct ospf_route * | |
110 | ospf_find_asbr_route_through_area (struct route_table *rtrs, | |
111 | struct prefix_ipv4 *asbr, | |
112 | struct ospf_area *area) | |
113 | { | |
114 | struct route_node *rn; | |
115 | ||
116 | /* Sanity check. */ | |
117 | if (rtrs == NULL) | |
118 | return NULL; | |
119 | ||
120 | rn = route_node_lookup (rtrs, (struct prefix *) asbr); | |
121 | ||
122 | if (rn) | |
123 | { | |
124 | listnode node; | |
125 | struct ospf_route *or; | |
126 | ||
127 | route_unlock_node (rn); | |
128 | ||
129 | for (node = listhead ((list) rn->info); node; nextnode (node)) | |
130 | if ((or = getdata (node)) != NULL) | |
131 | if (IPV4_ADDR_SAME (&or->u.std.area_id, &area->area_id)) | |
132 | return or; | |
133 | } | |
134 | ||
135 | return NULL; | |
136 | } | |
137 | ||
138 | void | |
139 | ospf_ase_complete_direct_routes (struct ospf_route *ro, struct in_addr nexthop) | |
140 | { | |
141 | listnode node; | |
142 | struct ospf_path *op; | |
143 | ||
144 | for (node = listhead (ro->path); node; nextnode (node)) | |
145 | if ((op = getdata (node)) != NULL) | |
146 | if (op->nexthop.s_addr == 0) | |
147 | op->nexthop.s_addr = nexthop.s_addr; | |
148 | } | |
149 | ||
150 | int | |
68980084 | 151 | ospf_ase_forward_address_check (struct ospf *ospf, struct in_addr fwd_addr) |
718e3744 | 152 | { |
153 | listnode ifn; | |
154 | struct ospf_interface *oi; | |
155 | ||
68980084 | 156 | for (ifn = listhead (ospf->oiflist); ifn; nextnode (ifn)) |
718e3744 | 157 | if ((oi = getdata (ifn)) != NULL) |
2e3b2e47 | 158 | if (if_is_operative (oi->ifp)) |
718e3744 | 159 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) |
160 | if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &fwd_addr)) | |
161 | return 0; | |
162 | ||
163 | return 1; | |
164 | } | |
165 | ||
166 | /* Calculate ASBR route. */ | |
167 | struct ospf_route * | |
68980084 | 168 | ospf_ase_calculate_asbr_route (struct ospf *ospf, |
169 | struct route_table *rt_network, | |
718e3744 | 170 | struct route_table *rt_router, |
171 | struct as_external_lsa *al) | |
172 | { | |
173 | struct prefix_ipv4 asbr; | |
174 | struct ospf_route *asbr_route; | |
175 | struct route_node *rn; | |
176 | ||
177 | /* Find ASBR route from Router routing table. */ | |
178 | asbr.family = AF_INET; | |
179 | asbr.prefix = al->header.adv_router; | |
180 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
181 | apply_mask_ipv4 (&asbr); | |
182 | ||
68980084 | 183 | asbr_route = ospf_find_asbr_route (ospf, rt_router, &asbr); |
718e3744 | 184 | |
185 | if (asbr_route == NULL) | |
186 | { | |
187 | zlog_info ("ospf_ase_calculate(): Route to ASBR %s not found", | |
188 | inet_ntoa (asbr.prefix)); | |
189 | return NULL; | |
190 | } | |
191 | ||
192 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) | |
193 | { | |
194 | zlog_info ("ospf_ase_calculate(): Originating router is not an ASBR"); | |
195 | return NULL; | |
196 | } | |
197 | ||
198 | if (al->e[0].fwd_addr.s_addr != 0) | |
199 | { | |
200 | zlog_info ("ospf_ase_calculate(): " | |
201 | "Forwarding address is not 0.0.0.0."); | |
202 | ||
68980084 | 203 | if (! ospf_ase_forward_address_check (ospf, al->e[0].fwd_addr)) |
718e3744 | 204 | { |
205 | zlog_info ("ospf_ase_calculate(): " | |
206 | "Forwarding address is one of our addresses, Ignore."); | |
207 | return NULL; | |
208 | } | |
209 | ||
210 | zlog_info ("ospf_ase_calculate(): " | |
211 | "Looking up in the Network Routing Table."); | |
212 | ||
213 | /* Looking up the path to the fwd_addr from Network route. */ | |
214 | asbr.family = AF_INET; | |
215 | asbr.prefix = al->e[0].fwd_addr; | |
216 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
217 | ||
218 | rn = route_node_match (rt_network, (struct prefix *) &asbr); | |
219 | ||
220 | if (rn == NULL) | |
221 | { | |
222 | zlog_info ("ospf_ase_calculate(): " | |
223 | "Couldn't find a route to the forwarding address."); | |
224 | return NULL; | |
225 | } | |
226 | ||
227 | route_unlock_node (rn); | |
228 | ||
229 | if ((asbr_route = rn->info) == NULL) | |
230 | { | |
231 | zlog_info ("ospf_ase_calculate(): " | |
232 | "Somehow OSPF route to ASBR is lost"); | |
233 | return NULL; | |
234 | } | |
235 | } | |
236 | ||
237 | return asbr_route; | |
238 | } | |
239 | ||
240 | struct ospf_route * | |
241 | ospf_ase_calculate_new_route (struct ospf_lsa *lsa, | |
242 | struct ospf_route *asbr_route, u_int32_t metric) | |
243 | { | |
244 | struct as_external_lsa *al; | |
245 | struct ospf_route *new; | |
246 | ||
247 | al = (struct as_external_lsa *) lsa->data; | |
248 | ||
249 | new = ospf_route_new (); | |
250 | ||
251 | /* Set redistributed type -- does make sense? */ | |
252 | /* new->type = type; */ | |
253 | new->id = al->header.id; | |
254 | new->mask = al->mask; | |
255 | ||
256 | if (!IS_EXTERNAL_METRIC (al->e[0].tos)) | |
257 | { | |
258 | zlog_info ("Route[External]: type-1 created."); | |
259 | new->path_type = OSPF_PATH_TYPE1_EXTERNAL; | |
260 | new->cost = asbr_route->cost + metric; /* X + Y */ | |
261 | } | |
262 | else | |
263 | { | |
264 | zlog_info ("Route[External]: type-2 created."); | |
265 | new->path_type = OSPF_PATH_TYPE2_EXTERNAL; | |
266 | new->cost = asbr_route->cost; /* X */ | |
267 | new->u.ext.type2_cost = metric; /* Y */ | |
268 | } | |
269 | ||
270 | new->type = OSPF_DESTINATION_NETWORK; | |
271 | new->path = list_new (); | |
272 | new->u.ext.origin = lsa; | |
273 | new->u.ext.tag = ntohl (al->e[0].route_tag); | |
274 | new->u.ext.asbr = asbr_route; | |
275 | ||
276 | assert (new != asbr_route); | |
277 | ||
278 | return new; | |
279 | } | |
280 | ||
281 | #define OSPF_ASE_CALC_INTERVAL 1 | |
282 | ||
283 | int | |
68980084 | 284 | ospf_ase_calculate_route (struct ospf *ospf, struct ospf_lsa * lsa) |
718e3744 | 285 | { |
286 | u_int32_t metric; | |
287 | struct as_external_lsa *al; | |
288 | struct ospf_route *asbr_route; | |
289 | struct prefix_ipv4 asbr, p; | |
290 | struct route_node *rn; | |
291 | struct ospf_route *new, *or; | |
292 | int ret; | |
293 | ||
294 | assert (lsa); | |
295 | al = (struct as_external_lsa *) lsa->data; | |
296 | ||
297 | #ifdef HAVE_NSSA | |
298 | if (lsa->data->type == OSPF_AS_NSSA_LSA) | |
299 | if (IS_DEBUG_OSPF_NSSA) | |
300 | zlog_info ("ospf_ase_calc(): Processing Type-7"); | |
301 | ||
302 | /* Stay away from any Local Translated Type-7 LSAs */ | |
303 | if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
304 | { | |
305 | if (IS_DEBUG_OSPF_NSSA) | |
306 | zlog_info ("ospf_ase_calc(): Rejecting Local Xlt'd"); | |
307 | return 0; | |
308 | } | |
309 | #endif /* HAVE_NSSA */ | |
310 | ||
311 | zlog_info ("Route[External]: Calculate AS-external-LSA to %s/%d", | |
312 | inet_ntoa (al->header.id), ip_masklen (al->mask)); | |
313 | /* (1) If the cost specified by the LSA is LSInfinity, or if the | |
314 | LSA's LS age is equal to MaxAge, then examine the next LSA. */ | |
315 | if ((metric = GET_METRIC (al->e[0].metric)) >= OSPF_LS_INFINITY) | |
316 | { | |
317 | zlog_info ("Route[External]: Metric is OSPF_LS_INFINITY"); | |
318 | return 0; | |
319 | } | |
320 | if (IS_LSA_MAXAGE (lsa)) | |
321 | { | |
322 | zlog_info ("Route[External]: AS-external-LSA is MAXAGE"); | |
323 | return 0; | |
324 | } | |
325 | ||
326 | /* (2) If the LSA was originated by the calculating router itself, | |
327 | examine the next LSA. */ | |
328 | if (IS_LSA_SELF (lsa)) | |
329 | { | |
330 | zlog_info ("Route[External]: AS-external-LSA is self originated"); | |
331 | return 0; | |
332 | } | |
333 | ||
334 | /* (3) Call the destination described by the LSA N. N's address is | |
335 | obtained by masking the LSA's Link State ID with the | |
336 | network/subnet mask contained in the body of the LSA. Look | |
337 | up the routing table entries (potentially one per attached | |
338 | area) for the AS boundary router (ASBR) that originated the | |
339 | LSA. If no entries exist for router ASBR (i.e., ASBR is | |
340 | unreachable), do nothing with this LSA and consider the next | |
341 | in the list. */ | |
342 | ||
343 | asbr.family = AF_INET; | |
344 | asbr.prefix = al->header.adv_router; | |
345 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
346 | apply_mask_ipv4 (&asbr); | |
347 | ||
68980084 | 348 | asbr_route = ospf_find_asbr_route (ospf, ospf->new_rtrs, &asbr); |
718e3744 | 349 | if (asbr_route == NULL) |
350 | { | |
351 | zlog_info ("Route[External]: Can't find originating ASBR route"); | |
352 | return 0; | |
353 | } | |
354 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) | |
355 | { | |
356 | zlog_info ("Route[External]: Originating router is not an ASBR"); | |
357 | return 0; | |
358 | } | |
359 | ||
360 | /* Else, this LSA describes an AS external path to destination | |
361 | N. Examine the forwarding address specified in the AS- | |
362 | external-LSA. This indicates the IP address to which | |
363 | packets for the destination should be forwarded. */ | |
364 | ||
365 | if (al->e[0].fwd_addr.s_addr == 0) | |
366 | { | |
367 | /* If the forwarding address is set to 0.0.0.0, packets should | |
368 | be sent to the ASBR itself. Among the multiple routing table | |
369 | entries for the ASBR, select the preferred entry as follows. | |
370 | If RFC1583Compatibility is set to "disabled", prune the set | |
371 | of routing table entries for the ASBR as described in | |
372 | Section 16.4.1. In any case, among the remaining routing | |
373 | table entries, select the routing table entry with the least | |
374 | cost; when there are multiple least cost routing table | |
375 | entries the entry whose associated area has the largest OSPF | |
376 | Area ID (when considered as an unsigned 32-bit integer) is | |
377 | chosen. */ | |
378 | ||
379 | /* asbr_route already contains the requested route */ | |
380 | } | |
381 | else | |
382 | { | |
383 | /* If the forwarding address is non-zero, look up the | |
384 | forwarding address in the routing table.[24] The matching | |
385 | routing table entry must specify an intra-area or inter-area | |
386 | path; if no such path exists, do nothing with the LSA and | |
387 | consider the next in the list. */ | |
68980084 | 388 | if (! ospf_ase_forward_address_check (ospf, al->e[0].fwd_addr)) |
718e3744 | 389 | { |
390 | zlog_info ("Route[External]: Forwarding address is our router address"); | |
391 | return 0; | |
392 | } | |
393 | ||
394 | asbr.family = AF_INET; | |
395 | asbr.prefix = al->e[0].fwd_addr; | |
396 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
397 | ||
68980084 | 398 | rn = route_node_match (ospf->new_table, (struct prefix *) &asbr); |
718e3744 | 399 | |
400 | if (rn == NULL || (asbr_route = rn->info) == NULL) | |
401 | { | |
402 | zlog_info ("Route[External]: Can't find route to forwarding address"); | |
403 | if (rn) | |
404 | route_unlock_node (rn); | |
405 | return 0; | |
406 | } | |
407 | ||
408 | route_unlock_node (rn); | |
409 | } | |
410 | ||
411 | /* (4) Let X be the cost specified by the preferred routing table | |
412 | entry for the ASBR/forwarding address, and Y the cost | |
413 | specified in the LSA. X is in terms of the link state | |
414 | metric, and Y is a type 1 or 2 external metric. */ | |
415 | ||
416 | ||
417 | /* (5) Look up the routing table entry for the destination N. If | |
418 | no entry exists for N, install the AS external path to N, | |
419 | with next hop equal to the list of next hops to the | |
420 | forwarding address, and advertising router equal to ASBR. | |
421 | If the external metric type is 1, then the path-type is set | |
422 | to type 1 external and the cost is equal to X+Y. If the | |
423 | external metric type is 2, the path-type is set to type 2 | |
424 | external, the link state component of the route's cost is X, | |
425 | and the type 2 cost is Y. */ | |
426 | new = ospf_ase_calculate_new_route (lsa, asbr_route, metric); | |
427 | ||
428 | /* (6) Compare the AS external path described by the LSA with the | |
429 | existing paths in N's routing table entry, as follows. If | |
430 | the new path is preferred, it replaces the present paths in | |
431 | N's routing table entry. If the new path is of equal | |
432 | preference, it is added to N's routing table entry's list of | |
433 | paths. */ | |
434 | ||
435 | /* Set prefix. */ | |
436 | p.family = AF_INET; | |
437 | p.prefix = al->header.id; | |
438 | p.prefixlen = ip_masklen (al->mask); | |
439 | ||
440 | /* if there is a Intra/Inter area route to the N | |
441 | do not install external route */ | |
68980084 | 442 | if ((rn = route_node_lookup (ospf->new_table, |
718e3744 | 443 | (struct prefix *) &p)) != NULL |
444 | && (rn->info != NULL)) | |
445 | { | |
446 | if (new) | |
447 | ospf_route_free (new); | |
448 | return 0; | |
449 | } | |
450 | ||
451 | /* Find a route to the same dest */ | |
452 | /* If there is no route, create new one. */ | |
68980084 | 453 | if ((rn = route_node_lookup (ospf->new_external_route, |
718e3744 | 454 | (struct prefix *) &p)) == NULL |
455 | || (or = rn->info) == NULL) | |
456 | { | |
457 | zlog_info ("Route[External]: Adding a new route %s/%d", | |
458 | inet_ntoa (p.prefix), p.prefixlen); | |
459 | ||
68980084 | 460 | ospf_route_add (ospf->new_external_route, &p, new, asbr_route); |
718e3744 | 461 | |
462 | if (al->e[0].fwd_addr.s_addr) | |
463 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
464 | return 0; | |
465 | } | |
466 | else | |
467 | { | |
468 | /* (a) Intra-area and inter-area paths are always preferred | |
469 | over AS external paths. | |
470 | ||
471 | (b) Type 1 external paths are always preferred over type 2 | |
472 | external paths. When all paths are type 2 external | |
473 | paths, the paths with the smallest advertised type 2 | |
474 | metric are always preferred. */ | |
68980084 | 475 | ret = ospf_route_cmp (ospf, new, or); |
718e3744 | 476 | |
477 | /* (c) If the new AS external path is still indistinguishable | |
478 | from the current paths in the N's routing table entry, | |
479 | and RFC1583Compatibility is set to "disabled", select | |
480 | the preferred paths based on the intra-AS paths to the | |
481 | ASBR/forwarding addresses, as specified in Section | |
482 | 16.4.1. | |
483 | ||
484 | (d) If the new AS external path is still indistinguishable | |
485 | from the current paths in the N's routing table entry, | |
486 | select the preferred path based on a least cost | |
487 | comparison. Type 1 external paths are compared by | |
488 | looking at the sum of the distance to the forwarding | |
489 | address and the advertised type 1 metric (X+Y). Type 2 | |
490 | external paths advertising equal type 2 metrics are | |
491 | compared by looking at the distance to the forwarding | |
492 | addresses. | |
493 | */ | |
494 | /* New route is better */ | |
495 | if (ret < 0) | |
496 | { | |
497 | zlog_info ("Route[External]: New route is better"); | |
498 | ospf_route_subst (rn, new, asbr_route); | |
499 | if (al->e[0].fwd_addr.s_addr) | |
500 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
501 | or = new; | |
502 | new = NULL; | |
503 | } | |
504 | /* Old route is better */ | |
505 | else if (ret > 0) | |
506 | { | |
507 | zlog_info ("Route[External]: Old route is better"); | |
508 | /* do nothing */ | |
509 | } | |
510 | /* Routes are equal */ | |
511 | else | |
512 | { | |
513 | zlog_info ("Route[External]: Routes are equal"); | |
514 | ospf_route_copy_nexthops (or, asbr_route->path); | |
515 | if (al->e[0].fwd_addr.s_addr) | |
516 | ospf_ase_complete_direct_routes (or, al->e[0].fwd_addr); | |
517 | } | |
518 | } | |
519 | /* Make sure setting newly calculated ASBR route.*/ | |
520 | or->u.ext.asbr = asbr_route; | |
521 | if (new) | |
522 | ospf_route_free (new); | |
523 | ||
524 | lsa->route = or; | |
525 | return 0; | |
526 | } | |
527 | ||
528 | int | |
529 | ospf_ase_route_match_same (struct route_table *rt, struct prefix *prefix, | |
530 | struct ospf_route *newor) | |
531 | { | |
532 | struct route_node *rn; | |
533 | struct ospf_route *or; | |
534 | struct ospf_path *op; | |
535 | struct ospf_path *newop; | |
536 | listnode n1; | |
537 | listnode n2; | |
538 | ||
539 | if (! rt || ! prefix) | |
540 | return 0; | |
541 | ||
542 | rn = route_node_lookup (rt, prefix); | |
543 | if (! rn) | |
544 | return 0; | |
545 | ||
546 | route_unlock_node (rn); | |
547 | ||
548 | or = rn->info; | |
549 | if (or->path_type != newor->path_type) | |
550 | return 0; | |
551 | ||
552 | switch (or->path_type) | |
553 | { | |
554 | case OSPF_PATH_TYPE1_EXTERNAL: | |
555 | if (or->cost != newor->cost) | |
556 | return 0; | |
557 | break; | |
558 | case OSPF_PATH_TYPE2_EXTERNAL: | |
559 | if ((or->cost != newor->cost) || | |
560 | (or->u.ext.type2_cost != newor->u.ext.type2_cost)) | |
561 | return 0; | |
562 | break; | |
563 | default: | |
564 | assert (0); | |
565 | return 0; | |
566 | } | |
567 | ||
568 | if (or->path->count != newor->path->count) | |
569 | return 0; | |
570 | ||
571 | /* Check each path. */ | |
572 | for (n1 = listhead (or->path), n2 = listhead (newor->path); | |
573 | n1 && n2; nextnode (n1), nextnode (n2)) | |
574 | { | |
575 | op = getdata (n1); | |
576 | newop = getdata (n2); | |
577 | ||
578 | if (! IPV4_ADDR_SAME (&op->nexthop, &newop->nexthop)) | |
579 | return 0; | |
580 | } | |
581 | return 1; | |
582 | } | |
583 | ||
584 | int | |
585 | ospf_ase_compare_tables (struct route_table *new_external_route, | |
586 | struct route_table *old_external_route) | |
587 | { | |
588 | struct route_node *rn, *new_rn; | |
589 | struct ospf_route *or; | |
590 | ||
591 | /* Remove deleted routes */ | |
592 | for (rn = route_top (old_external_route); rn; rn = route_next (rn)) | |
593 | if ((or = rn->info)) | |
594 | { | |
595 | if (! (new_rn = route_node_lookup (new_external_route, &rn->p))) | |
596 | ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or); | |
597 | else | |
598 | route_unlock_node (new_rn); | |
599 | } | |
600 | ||
601 | ||
602 | /* Install new routes */ | |
603 | for (rn = route_top (new_external_route); rn; rn = route_next (rn)) | |
604 | if ((or = rn->info) != NULL) | |
605 | if (! ospf_ase_route_match_same (old_external_route, &rn->p, or)) | |
606 | ospf_zebra_add ((struct prefix_ipv4 *) &rn->p, or); | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | int | |
612 | ospf_ase_calculate_timer (struct thread *t) | |
613 | { | |
614 | struct ospf *ospf; | |
68980084 | 615 | struct ospf_lsa *lsa; |
616 | struct route_node *rn; | |
718e3744 | 617 | #ifdef HAVE_NSSA |
68980084 | 618 | listnode node; |
619 | struct ospf_area *area; | |
718e3744 | 620 | #endif /* HAVE_NSSA */ |
621 | ||
622 | ospf = THREAD_ARG (t); | |
623 | ospf->t_ase_calc = NULL; | |
624 | ||
625 | if (ospf->ase_calc) | |
626 | { | |
627 | ospf->ase_calc = 0; | |
628 | ||
629 | /* Calculate external route for each AS-external-LSA */ | |
68980084 | 630 | LSDB_LOOP (EXTERNAL_LSDB (ospf), rn, lsa) |
631 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 632 | |
633 | #ifdef HAVE_NSSA | |
634 | /* This version simple adds to the table all NSSA areas */ | |
68980084 | 635 | if (ospf->anyNSSA) |
636 | for (node = listhead (ospf->areas); node; nextnode (node)) | |
718e3744 | 637 | { |
638 | area = getdata (node); | |
639 | if (IS_DEBUG_OSPF_NSSA) | |
640 | zlog_info ("ospf_ase_calculate_timer(): looking at area %s", | |
641 | inet_ntoa (area->area_id)); | |
642 | ||
643 | if (area->external_routing == OSPF_AREA_NSSA) | |
68980084 | 644 | LSDB_LOOP (NSSA_LSDB (area), rn, lsa) |
645 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 646 | } |
f2c80652 | 647 | /* kevinm: And add the NSSA routes in ospf_top */ |
f6386eeb | 648 | LSDB_LOOP (NSSA_LSDB (ospf),rn,lsa) |
649 | ospf_ase_calculate_route(ospf,lsa); | |
f2c80652 | 650 | |
718e3744 | 651 | #endif /* HAVE_NSSA */ |
652 | ||
653 | /* Compare old and new external routing table and install the | |
654 | difference info zebra/kernel */ | |
68980084 | 655 | ospf_ase_compare_tables (ospf->new_external_route, |
656 | ospf->old_external_route); | |
718e3744 | 657 | |
658 | /* Delete old external routing table */ | |
68980084 | 659 | ospf_route_table_free (ospf->old_external_route); |
660 | ospf->old_external_route = ospf->new_external_route; | |
661 | ospf->new_external_route = route_table_init (); | |
718e3744 | 662 | } |
663 | return 0; | |
664 | } | |
665 | ||
666 | void | |
68980084 | 667 | ospf_ase_calculate_schedule (struct ospf *ospf) |
718e3744 | 668 | { |
68980084 | 669 | if (ospf == NULL) |
718e3744 | 670 | return; |
671 | ||
68980084 | 672 | ospf->ase_calc = 1; |
718e3744 | 673 | } |
674 | ||
675 | void | |
68980084 | 676 | ospf_ase_calculate_timer_add (struct ospf *ospf) |
718e3744 | 677 | { |
68980084 | 678 | if (ospf == NULL) |
718e3744 | 679 | return; |
680 | ||
68980084 | 681 | if (! ospf->t_ase_calc) |
682 | ospf->t_ase_calc = thread_add_timer (master, ospf_ase_calculate_timer, | |
683 | ospf, OSPF_ASE_CALC_INTERVAL); | |
718e3744 | 684 | } |
685 | ||
686 | void | |
687 | ospf_ase_register_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
688 | { | |
689 | struct route_node *rn; | |
690 | struct prefix_ipv4 p; | |
691 | list lst; | |
692 | struct as_external_lsa *al; | |
693 | ||
694 | al = (struct as_external_lsa *) lsa->data; | |
695 | p.family = AF_INET; | |
696 | p.prefix = lsa->data->id; | |
697 | p.prefixlen = ip_masklen (al->mask); | |
698 | apply_mask_ipv4 (&p); | |
699 | ||
700 | rn = route_node_get (top->external_lsas, (struct prefix *) &p); | |
701 | if ((lst = rn->info) == NULL) | |
702 | rn->info = lst = list_new(); | |
703 | ||
704 | /* We assume that if LSA is deleted from DB | |
705 | is is also deleted from this RT */ | |
706 | ||
707 | listnode_add (lst, ospf_lsa_lock (lsa)); | |
708 | } | |
709 | ||
710 | void | |
711 | ospf_ase_unregister_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
712 | { | |
713 | struct route_node *rn; | |
714 | struct prefix_ipv4 p; | |
715 | list lst; | |
716 | struct as_external_lsa *al; | |
717 | ||
718 | al = (struct as_external_lsa *) lsa->data; | |
719 | p.family = AF_INET; | |
720 | p.prefix = lsa->data->id; | |
721 | p.prefixlen = ip_masklen (al->mask); | |
722 | apply_mask_ipv4 (&p); | |
723 | ||
724 | rn = route_node_get (top->external_lsas, (struct prefix *) &p); | |
725 | lst = rn->info; | |
726 | #ifdef ORIGINAL_CODING | |
727 | assert (lst); | |
728 | ||
729 | listnode_delete (lst, lsa); | |
730 | ospf_lsa_unlock (lsa); | |
731 | #else /* ORIGINAL_CODING */ | |
732 | /* XXX lst can be NULL */ | |
733 | if (lst) { | |
734 | listnode_delete (lst, lsa); | |
735 | ospf_lsa_unlock (lsa); | |
736 | } | |
737 | #endif /* ORIGINAL_CODING */ | |
738 | } | |
739 | ||
740 | void | |
741 | ospf_ase_external_lsas_finish (struct route_table *rt) | |
742 | { | |
743 | struct route_node *rn; | |
744 | struct ospf_lsa *lsa; | |
745 | list lst; | |
746 | listnode node; | |
747 | ||
748 | for (rn = route_top (rt); rn; rn = route_next (rn)) | |
749 | if ((lst = rn->info) != NULL) | |
750 | { | |
751 | for (node = listhead (lst); node; node = nextnode (node)) | |
752 | if ((lsa = getdata (node)) != NULL) | |
753 | ospf_lsa_unlock (lsa); | |
754 | list_delete (lst); | |
755 | } | |
756 | ||
757 | route_table_finish (rt); | |
758 | } | |
759 | ||
760 | void | |
68980084 | 761 | ospf_ase_incremental_update (struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 762 | { |
763 | list lsas; | |
764 | listnode node; | |
765 | struct route_node *rn, *rn2; | |
766 | struct prefix_ipv4 p; | |
767 | struct route_table *tmp_old; | |
768 | struct as_external_lsa *al; | |
769 | ||
770 | al = (struct as_external_lsa *) lsa->data; | |
771 | p.family = AF_INET; | |
772 | p.prefix = lsa->data->id; | |
773 | p.prefixlen = ip_masklen (al->mask); | |
774 | apply_mask_ipv4 (&p); | |
775 | ||
776 | /* if new_table is NULL, there was no spf calculation, thus | |
777 | incremental update is unneeded */ | |
68980084 | 778 | if (!ospf->new_table) |
718e3744 | 779 | return; |
780 | ||
781 | /* If there is already an intra-area or inter-area route | |
782 | to the destination, no recalculation is necessary | |
783 | (internal routes take precedence). */ | |
784 | ||
68980084 | 785 | rn = route_node_lookup (ospf->new_table, (struct prefix *) &p); |
718e3744 | 786 | if (rn && rn->info) |
787 | { | |
788 | route_unlock_node (rn); | |
789 | return; | |
790 | } | |
791 | ||
68980084 | 792 | rn = route_node_lookup (ospf->external_lsas, (struct prefix *) &p); |
718e3744 | 793 | assert (rn && rn->info); |
794 | lsas = rn->info; | |
795 | ||
796 | for (node = listhead (lsas); node; nextnode (node)) | |
797 | if ((lsa = getdata (node)) != NULL) | |
68980084 | 798 | ospf_ase_calculate_route (ospf, lsa); |
718e3744 | 799 | |
800 | /* prepare temporary old routing table for compare */ | |
801 | tmp_old = route_table_init (); | |
68980084 | 802 | rn = route_node_lookup (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 803 | if (rn && rn->info) |
804 | { | |
805 | rn2 = route_node_get (tmp_old, (struct prefix *) &p); | |
806 | rn2->info = rn->info; | |
807 | } | |
808 | ||
809 | /* install changes to zebra */ | |
68980084 | 810 | ospf_ase_compare_tables (ospf->new_external_route, tmp_old); |
718e3744 | 811 | |
68980084 | 812 | /* update ospf->old_external_route table */ |
718e3744 | 813 | if (rn && rn->info) |
814 | ospf_route_free ((struct ospf_route *) rn->info); | |
815 | ||
68980084 | 816 | rn2 = route_node_lookup (ospf->new_external_route, (struct prefix *) &p); |
817 | /* if new route exists, install it to ospf->old_external_route */ | |
718e3744 | 818 | if (rn2 && rn2->info) |
819 | { | |
820 | if (!rn) | |
68980084 | 821 | rn = route_node_get (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 822 | rn->info = rn2->info; |
823 | } | |
824 | else | |
825 | { | |
68980084 | 826 | /* remove route node from ospf->old_external_route */ |
718e3744 | 827 | if (rn) |
828 | { | |
829 | rn->info = NULL; | |
830 | route_unlock_node (rn); | |
831 | route_unlock_node (rn); | |
832 | } | |
833 | } | |
834 | ||
835 | if (rn2) | |
836 | { | |
68980084 | 837 | /* rn2->info is stored in route node of ospf->old_external_route */ |
718e3744 | 838 | rn2->info = NULL; |
839 | route_unlock_node (rn2); | |
840 | route_unlock_node (rn2); | |
841 | } | |
842 | ||
843 | route_table_finish (tmp_old); | |
844 | } |