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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; | |
52dc7ee6 | 57 | struct listnode *node; |
58 | struct list *chosen; | |
718e3744 | 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)) |
52dc7ee6 | 74 | for (node = listhead ((struct list *) rn->info); node; nextnode (node)) |
718e3744 | 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 | { | |
52dc7ee6 | 124 | struct listnode *node; |
718e3744 | 125 | struct ospf_route *or; |
126 | ||
127 | route_unlock_node (rn); | |
128 | ||
52dc7ee6 | 129 | for (node = listhead ((struct list *) rn->info); node; nextnode (node)) |
718e3744 | 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 | { | |
52dc7ee6 | 141 | struct listnode *node; |
718e3744 | 142 | struct ospf_path *op; |
143 | ||
96735eea | 144 | for (node = listhead (ro->paths); node; nextnode (node)) |
718e3744 | 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 | { |
52dc7ee6 | 153 | struct listnode *ifn; |
718e3744 | 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; | |
718e3744 | 271 | new->u.ext.origin = lsa; |
272 | new->u.ext.tag = ntohl (al->e[0].route_tag); | |
273 | new->u.ext.asbr = asbr_route; | |
274 | ||
275 | assert (new != asbr_route); | |
276 | ||
277 | return new; | |
278 | } | |
279 | ||
280 | #define OSPF_ASE_CALC_INTERVAL 1 | |
281 | ||
282 | int | |
68980084 | 283 | ospf_ase_calculate_route (struct ospf *ospf, struct ospf_lsa * lsa) |
718e3744 | 284 | { |
285 | u_int32_t metric; | |
286 | struct as_external_lsa *al; | |
287 | struct ospf_route *asbr_route; | |
288 | struct prefix_ipv4 asbr, p; | |
289 | struct route_node *rn; | |
290 | struct ospf_route *new, *or; | |
291 | int ret; | |
292 | ||
293 | assert (lsa); | |
294 | al = (struct as_external_lsa *) lsa->data; | |
295 | ||
718e3744 | 296 | if (lsa->data->type == OSPF_AS_NSSA_LSA) |
297 | if (IS_DEBUG_OSPF_NSSA) | |
298 | zlog_info ("ospf_ase_calc(): Processing Type-7"); | |
299 | ||
300 | /* Stay away from any Local Translated Type-7 LSAs */ | |
301 | if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
302 | { | |
303 | if (IS_DEBUG_OSPF_NSSA) | |
304 | zlog_info ("ospf_ase_calc(): Rejecting Local Xlt'd"); | |
305 | return 0; | |
306 | } | |
718e3744 | 307 | |
308 | zlog_info ("Route[External]: Calculate AS-external-LSA to %s/%d", | |
309 | inet_ntoa (al->header.id), ip_masklen (al->mask)); | |
310 | /* (1) If the cost specified by the LSA is LSInfinity, or if the | |
311 | LSA's LS age is equal to MaxAge, then examine the next LSA. */ | |
312 | if ((metric = GET_METRIC (al->e[0].metric)) >= OSPF_LS_INFINITY) | |
313 | { | |
314 | zlog_info ("Route[External]: Metric is OSPF_LS_INFINITY"); | |
315 | return 0; | |
316 | } | |
317 | if (IS_LSA_MAXAGE (lsa)) | |
318 | { | |
319 | zlog_info ("Route[External]: AS-external-LSA is MAXAGE"); | |
320 | return 0; | |
321 | } | |
322 | ||
323 | /* (2) If the LSA was originated by the calculating router itself, | |
324 | examine the next LSA. */ | |
325 | if (IS_LSA_SELF (lsa)) | |
326 | { | |
327 | zlog_info ("Route[External]: AS-external-LSA is self originated"); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | /* (3) Call the destination described by the LSA N. N's address is | |
332 | obtained by masking the LSA's Link State ID with the | |
333 | network/subnet mask contained in the body of the LSA. Look | |
334 | up the routing table entries (potentially one per attached | |
335 | area) for the AS boundary router (ASBR) that originated the | |
336 | LSA. If no entries exist for router ASBR (i.e., ASBR is | |
337 | unreachable), do nothing with this LSA and consider the next | |
338 | in the list. */ | |
339 | ||
340 | asbr.family = AF_INET; | |
341 | asbr.prefix = al->header.adv_router; | |
342 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
343 | apply_mask_ipv4 (&asbr); | |
344 | ||
68980084 | 345 | asbr_route = ospf_find_asbr_route (ospf, ospf->new_rtrs, &asbr); |
718e3744 | 346 | if (asbr_route == NULL) |
347 | { | |
348 | zlog_info ("Route[External]: Can't find originating ASBR route"); | |
349 | return 0; | |
350 | } | |
351 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) | |
352 | { | |
353 | zlog_info ("Route[External]: Originating router is not an ASBR"); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | /* Else, this LSA describes an AS external path to destination | |
358 | N. Examine the forwarding address specified in the AS- | |
359 | external-LSA. This indicates the IP address to which | |
360 | packets for the destination should be forwarded. */ | |
361 | ||
362 | if (al->e[0].fwd_addr.s_addr == 0) | |
363 | { | |
364 | /* If the forwarding address is set to 0.0.0.0, packets should | |
365 | be sent to the ASBR itself. Among the multiple routing table | |
366 | entries for the ASBR, select the preferred entry as follows. | |
367 | If RFC1583Compatibility is set to "disabled", prune the set | |
368 | of routing table entries for the ASBR as described in | |
369 | Section 16.4.1. In any case, among the remaining routing | |
370 | table entries, select the routing table entry with the least | |
371 | cost; when there are multiple least cost routing table | |
372 | entries the entry whose associated area has the largest OSPF | |
373 | Area ID (when considered as an unsigned 32-bit integer) is | |
374 | chosen. */ | |
375 | ||
376 | /* asbr_route already contains the requested route */ | |
377 | } | |
378 | else | |
379 | { | |
380 | /* If the forwarding address is non-zero, look up the | |
381 | forwarding address in the routing table.[24] The matching | |
382 | routing table entry must specify an intra-area or inter-area | |
383 | path; if no such path exists, do nothing with the LSA and | |
384 | consider the next in the list. */ | |
68980084 | 385 | if (! ospf_ase_forward_address_check (ospf, al->e[0].fwd_addr)) |
718e3744 | 386 | { |
387 | zlog_info ("Route[External]: Forwarding address is our router address"); | |
388 | return 0; | |
389 | } | |
390 | ||
391 | asbr.family = AF_INET; | |
392 | asbr.prefix = al->e[0].fwd_addr; | |
393 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
394 | ||
68980084 | 395 | rn = route_node_match (ospf->new_table, (struct prefix *) &asbr); |
718e3744 | 396 | |
397 | if (rn == NULL || (asbr_route = rn->info) == NULL) | |
398 | { | |
399 | zlog_info ("Route[External]: Can't find route to forwarding address"); | |
400 | if (rn) | |
401 | route_unlock_node (rn); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | route_unlock_node (rn); | |
406 | } | |
407 | ||
408 | /* (4) Let X be the cost specified by the preferred routing table | |
409 | entry for the ASBR/forwarding address, and Y the cost | |
410 | specified in the LSA. X is in terms of the link state | |
411 | metric, and Y is a type 1 or 2 external metric. */ | |
412 | ||
413 | ||
414 | /* (5) Look up the routing table entry for the destination N. If | |
415 | no entry exists for N, install the AS external path to N, | |
416 | with next hop equal to the list of next hops to the | |
417 | forwarding address, and advertising router equal to ASBR. | |
418 | If the external metric type is 1, then the path-type is set | |
419 | to type 1 external and the cost is equal to X+Y. If the | |
420 | external metric type is 2, the path-type is set to type 2 | |
421 | external, the link state component of the route's cost is X, | |
422 | and the type 2 cost is Y. */ | |
423 | new = ospf_ase_calculate_new_route (lsa, asbr_route, metric); | |
424 | ||
425 | /* (6) Compare the AS external path described by the LSA with the | |
426 | existing paths in N's routing table entry, as follows. If | |
427 | the new path is preferred, it replaces the present paths in | |
428 | N's routing table entry. If the new path is of equal | |
429 | preference, it is added to N's routing table entry's list of | |
430 | paths. */ | |
431 | ||
432 | /* Set prefix. */ | |
433 | p.family = AF_INET; | |
434 | p.prefix = al->header.id; | |
435 | p.prefixlen = ip_masklen (al->mask); | |
436 | ||
437 | /* if there is a Intra/Inter area route to the N | |
438 | do not install external route */ | |
68980084 | 439 | if ((rn = route_node_lookup (ospf->new_table, |
718e3744 | 440 | (struct prefix *) &p)) != NULL |
441 | && (rn->info != NULL)) | |
442 | { | |
443 | if (new) | |
444 | ospf_route_free (new); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | /* Find a route to the same dest */ | |
449 | /* If there is no route, create new one. */ | |
68980084 | 450 | if ((rn = route_node_lookup (ospf->new_external_route, |
718e3744 | 451 | (struct prefix *) &p)) == NULL |
452 | || (or = rn->info) == NULL) | |
453 | { | |
454 | zlog_info ("Route[External]: Adding a new route %s/%d", | |
455 | inet_ntoa (p.prefix), p.prefixlen); | |
456 | ||
68980084 | 457 | ospf_route_add (ospf->new_external_route, &p, new, asbr_route); |
718e3744 | 458 | |
459 | if (al->e[0].fwd_addr.s_addr) | |
460 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
461 | return 0; | |
462 | } | |
463 | else | |
464 | { | |
465 | /* (a) Intra-area and inter-area paths are always preferred | |
466 | over AS external paths. | |
467 | ||
468 | (b) Type 1 external paths are always preferred over type 2 | |
469 | external paths. When all paths are type 2 external | |
470 | paths, the paths with the smallest advertised type 2 | |
471 | metric are always preferred. */ | |
68980084 | 472 | ret = ospf_route_cmp (ospf, new, or); |
718e3744 | 473 | |
474 | /* (c) If the new AS external path is still indistinguishable | |
475 | from the current paths in the N's routing table entry, | |
476 | and RFC1583Compatibility is set to "disabled", select | |
477 | the preferred paths based on the intra-AS paths to the | |
478 | ASBR/forwarding addresses, as specified in Section | |
479 | 16.4.1. | |
480 | ||
481 | (d) If the new AS external path is still indistinguishable | |
482 | from the current paths in the N's routing table entry, | |
483 | select the preferred path based on a least cost | |
484 | comparison. Type 1 external paths are compared by | |
485 | looking at the sum of the distance to the forwarding | |
486 | address and the advertised type 1 metric (X+Y). Type 2 | |
487 | external paths advertising equal type 2 metrics are | |
488 | compared by looking at the distance to the forwarding | |
489 | addresses. | |
490 | */ | |
491 | /* New route is better */ | |
492 | if (ret < 0) | |
493 | { | |
494 | zlog_info ("Route[External]: New route is better"); | |
495 | ospf_route_subst (rn, new, asbr_route); | |
496 | if (al->e[0].fwd_addr.s_addr) | |
497 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
498 | or = new; | |
499 | new = NULL; | |
500 | } | |
501 | /* Old route is better */ | |
502 | else if (ret > 0) | |
503 | { | |
504 | zlog_info ("Route[External]: Old route is better"); | |
505 | /* do nothing */ | |
506 | } | |
507 | /* Routes are equal */ | |
508 | else | |
509 | { | |
510 | zlog_info ("Route[External]: Routes are equal"); | |
96735eea | 511 | ospf_route_copy_nexthops (or, asbr_route->paths); |
718e3744 | 512 | if (al->e[0].fwd_addr.s_addr) |
513 | ospf_ase_complete_direct_routes (or, al->e[0].fwd_addr); | |
514 | } | |
515 | } | |
516 | /* Make sure setting newly calculated ASBR route.*/ | |
517 | or->u.ext.asbr = asbr_route; | |
518 | if (new) | |
519 | ospf_route_free (new); | |
520 | ||
521 | lsa->route = or; | |
522 | return 0; | |
523 | } | |
524 | ||
525 | int | |
526 | ospf_ase_route_match_same (struct route_table *rt, struct prefix *prefix, | |
527 | struct ospf_route *newor) | |
528 | { | |
529 | struct route_node *rn; | |
530 | struct ospf_route *or; | |
531 | struct ospf_path *op; | |
532 | struct ospf_path *newop; | |
52dc7ee6 | 533 | struct listnode *n1; |
534 | struct listnode *n2; | |
718e3744 | 535 | |
536 | if (! rt || ! prefix) | |
537 | return 0; | |
538 | ||
539 | rn = route_node_lookup (rt, prefix); | |
540 | if (! rn) | |
541 | return 0; | |
542 | ||
543 | route_unlock_node (rn); | |
544 | ||
545 | or = rn->info; | |
546 | if (or->path_type != newor->path_type) | |
547 | return 0; | |
548 | ||
549 | switch (or->path_type) | |
550 | { | |
551 | case OSPF_PATH_TYPE1_EXTERNAL: | |
552 | if (or->cost != newor->cost) | |
553 | return 0; | |
554 | break; | |
555 | case OSPF_PATH_TYPE2_EXTERNAL: | |
556 | if ((or->cost != newor->cost) || | |
557 | (or->u.ext.type2_cost != newor->u.ext.type2_cost)) | |
558 | return 0; | |
559 | break; | |
560 | default: | |
561 | assert (0); | |
562 | return 0; | |
563 | } | |
564 | ||
96735eea | 565 | if (or->paths->count != newor->paths->count) |
718e3744 | 566 | return 0; |
567 | ||
568 | /* Check each path. */ | |
96735eea | 569 | for (n1 = listhead (or->paths), n2 = listhead (newor->paths); |
718e3744 | 570 | n1 && n2; nextnode (n1), nextnode (n2)) |
571 | { | |
572 | op = getdata (n1); | |
573 | newop = getdata (n2); | |
574 | ||
575 | if (! IPV4_ADDR_SAME (&op->nexthop, &newop->nexthop)) | |
576 | return 0; | |
577 | } | |
578 | return 1; | |
579 | } | |
580 | ||
581 | int | |
582 | ospf_ase_compare_tables (struct route_table *new_external_route, | |
583 | struct route_table *old_external_route) | |
584 | { | |
585 | struct route_node *rn, *new_rn; | |
586 | struct ospf_route *or; | |
587 | ||
588 | /* Remove deleted routes */ | |
589 | for (rn = route_top (old_external_route); rn; rn = route_next (rn)) | |
590 | if ((or = rn->info)) | |
591 | { | |
592 | if (! (new_rn = route_node_lookup (new_external_route, &rn->p))) | |
593 | ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or); | |
594 | else | |
595 | route_unlock_node (new_rn); | |
596 | } | |
597 | ||
598 | ||
599 | /* Install new routes */ | |
600 | for (rn = route_top (new_external_route); rn; rn = route_next (rn)) | |
601 | if ((or = rn->info) != NULL) | |
602 | if (! ospf_ase_route_match_same (old_external_route, &rn->p, or)) | |
603 | ospf_zebra_add ((struct prefix_ipv4 *) &rn->p, or); | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
608 | int | |
609 | ospf_ase_calculate_timer (struct thread *t) | |
610 | { | |
611 | struct ospf *ospf; | |
68980084 | 612 | struct ospf_lsa *lsa; |
613 | struct route_node *rn; | |
52dc7ee6 | 614 | struct listnode *node; |
68980084 | 615 | struct ospf_area *area; |
718e3744 | 616 | |
617 | ospf = THREAD_ARG (t); | |
618 | ospf->t_ase_calc = NULL; | |
619 | ||
620 | if (ospf->ase_calc) | |
621 | { | |
622 | ospf->ase_calc = 0; | |
623 | ||
624 | /* Calculate external route for each AS-external-LSA */ | |
68980084 | 625 | LSDB_LOOP (EXTERNAL_LSDB (ospf), rn, lsa) |
626 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 627 | |
718e3744 | 628 | /* This version simple adds to the table all NSSA areas */ |
68980084 | 629 | if (ospf->anyNSSA) |
630 | for (node = listhead (ospf->areas); node; nextnode (node)) | |
718e3744 | 631 | { |
632 | area = getdata (node); | |
633 | if (IS_DEBUG_OSPF_NSSA) | |
634 | zlog_info ("ospf_ase_calculate_timer(): looking at area %s", | |
635 | inet_ntoa (area->area_id)); | |
636 | ||
637 | if (area->external_routing == OSPF_AREA_NSSA) | |
68980084 | 638 | LSDB_LOOP (NSSA_LSDB (area), rn, lsa) |
639 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 640 | } |
f2c80652 | 641 | /* kevinm: And add the NSSA routes in ospf_top */ |
f6386eeb | 642 | LSDB_LOOP (NSSA_LSDB (ospf),rn,lsa) |
643 | ospf_ase_calculate_route(ospf,lsa); | |
f2c80652 | 644 | |
718e3744 | 645 | /* Compare old and new external routing table and install the |
646 | difference info zebra/kernel */ | |
68980084 | 647 | ospf_ase_compare_tables (ospf->new_external_route, |
648 | ospf->old_external_route); | |
718e3744 | 649 | |
650 | /* Delete old external routing table */ | |
68980084 | 651 | ospf_route_table_free (ospf->old_external_route); |
652 | ospf->old_external_route = ospf->new_external_route; | |
653 | ospf->new_external_route = route_table_init (); | |
718e3744 | 654 | } |
655 | return 0; | |
656 | } | |
657 | ||
658 | void | |
68980084 | 659 | ospf_ase_calculate_schedule (struct ospf *ospf) |
718e3744 | 660 | { |
68980084 | 661 | if (ospf == NULL) |
718e3744 | 662 | return; |
663 | ||
68980084 | 664 | ospf->ase_calc = 1; |
718e3744 | 665 | } |
666 | ||
667 | void | |
68980084 | 668 | ospf_ase_calculate_timer_add (struct ospf *ospf) |
718e3744 | 669 | { |
68980084 | 670 | if (ospf == NULL) |
718e3744 | 671 | return; |
672 | ||
68980084 | 673 | if (! ospf->t_ase_calc) |
674 | ospf->t_ase_calc = thread_add_timer (master, ospf_ase_calculate_timer, | |
675 | ospf, OSPF_ASE_CALC_INTERVAL); | |
718e3744 | 676 | } |
677 | ||
678 | void | |
679 | ospf_ase_register_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
680 | { | |
681 | struct route_node *rn; | |
682 | struct prefix_ipv4 p; | |
52dc7ee6 | 683 | struct list *lst; |
718e3744 | 684 | struct as_external_lsa *al; |
685 | ||
686 | al = (struct as_external_lsa *) lsa->data; | |
687 | p.family = AF_INET; | |
688 | p.prefix = lsa->data->id; | |
689 | p.prefixlen = ip_masklen (al->mask); | |
690 | apply_mask_ipv4 (&p); | |
691 | ||
692 | rn = route_node_get (top->external_lsas, (struct prefix *) &p); | |
693 | if ((lst = rn->info) == NULL) | |
694 | rn->info = lst = list_new(); | |
695 | ||
696 | /* We assume that if LSA is deleted from DB | |
697 | is is also deleted from this RT */ | |
698 | ||
699 | listnode_add (lst, ospf_lsa_lock (lsa)); | |
700 | } | |
701 | ||
702 | void | |
703 | ospf_ase_unregister_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
704 | { | |
705 | struct route_node *rn; | |
706 | struct prefix_ipv4 p; | |
52dc7ee6 | 707 | struct list *lst; |
718e3744 | 708 | struct as_external_lsa *al; |
709 | ||
710 | al = (struct as_external_lsa *) lsa->data; | |
711 | p.family = AF_INET; | |
712 | p.prefix = lsa->data->id; | |
713 | p.prefixlen = ip_masklen (al->mask); | |
714 | apply_mask_ipv4 (&p); | |
715 | ||
716 | rn = route_node_get (top->external_lsas, (struct prefix *) &p); | |
717 | lst = rn->info; | |
718 | #ifdef ORIGINAL_CODING | |
719 | assert (lst); | |
720 | ||
721 | listnode_delete (lst, lsa); | |
722 | ospf_lsa_unlock (lsa); | |
723 | #else /* ORIGINAL_CODING */ | |
724 | /* XXX lst can be NULL */ | |
725 | if (lst) { | |
726 | listnode_delete (lst, lsa); | |
727 | ospf_lsa_unlock (lsa); | |
728 | } | |
729 | #endif /* ORIGINAL_CODING */ | |
730 | } | |
731 | ||
732 | void | |
733 | ospf_ase_external_lsas_finish (struct route_table *rt) | |
734 | { | |
735 | struct route_node *rn; | |
736 | struct ospf_lsa *lsa; | |
52dc7ee6 | 737 | struct list *lst; |
738 | struct listnode *node; | |
718e3744 | 739 | |
740 | for (rn = route_top (rt); rn; rn = route_next (rn)) | |
741 | if ((lst = rn->info) != NULL) | |
742 | { | |
743 | for (node = listhead (lst); node; node = nextnode (node)) | |
744 | if ((lsa = getdata (node)) != NULL) | |
745 | ospf_lsa_unlock (lsa); | |
746 | list_delete (lst); | |
747 | } | |
748 | ||
749 | route_table_finish (rt); | |
750 | } | |
751 | ||
752 | void | |
68980084 | 753 | ospf_ase_incremental_update (struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 754 | { |
52dc7ee6 | 755 | struct list *lsas; |
756 | struct listnode *node; | |
718e3744 | 757 | struct route_node *rn, *rn2; |
758 | struct prefix_ipv4 p; | |
759 | struct route_table *tmp_old; | |
760 | struct as_external_lsa *al; | |
761 | ||
762 | al = (struct as_external_lsa *) lsa->data; | |
763 | p.family = AF_INET; | |
764 | p.prefix = lsa->data->id; | |
765 | p.prefixlen = ip_masklen (al->mask); | |
766 | apply_mask_ipv4 (&p); | |
767 | ||
768 | /* if new_table is NULL, there was no spf calculation, thus | |
769 | incremental update is unneeded */ | |
68980084 | 770 | if (!ospf->new_table) |
718e3744 | 771 | return; |
772 | ||
773 | /* If there is already an intra-area or inter-area route | |
774 | to the destination, no recalculation is necessary | |
775 | (internal routes take precedence). */ | |
776 | ||
68980084 | 777 | rn = route_node_lookup (ospf->new_table, (struct prefix *) &p); |
718e3744 | 778 | if (rn && rn->info) |
779 | { | |
780 | route_unlock_node (rn); | |
781 | return; | |
782 | } | |
783 | ||
68980084 | 784 | rn = route_node_lookup (ospf->external_lsas, (struct prefix *) &p); |
718e3744 | 785 | assert (rn && rn->info); |
786 | lsas = rn->info; | |
787 | ||
788 | for (node = listhead (lsas); node; nextnode (node)) | |
789 | if ((lsa = getdata (node)) != NULL) | |
68980084 | 790 | ospf_ase_calculate_route (ospf, lsa); |
718e3744 | 791 | |
792 | /* prepare temporary old routing table for compare */ | |
793 | tmp_old = route_table_init (); | |
68980084 | 794 | rn = route_node_lookup (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 795 | if (rn && rn->info) |
796 | { | |
797 | rn2 = route_node_get (tmp_old, (struct prefix *) &p); | |
798 | rn2->info = rn->info; | |
799 | } | |
800 | ||
801 | /* install changes to zebra */ | |
68980084 | 802 | ospf_ase_compare_tables (ospf->new_external_route, tmp_old); |
718e3744 | 803 | |
68980084 | 804 | /* update ospf->old_external_route table */ |
718e3744 | 805 | if (rn && rn->info) |
806 | ospf_route_free ((struct ospf_route *) rn->info); | |
807 | ||
68980084 | 808 | rn2 = route_node_lookup (ospf->new_external_route, (struct prefix *) &p); |
809 | /* if new route exists, install it to ospf->old_external_route */ | |
718e3744 | 810 | if (rn2 && rn2->info) |
811 | { | |
812 | if (!rn) | |
68980084 | 813 | rn = route_node_get (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 814 | rn->info = rn2->info; |
815 | } | |
816 | else | |
817 | { | |
68980084 | 818 | /* remove route node from ospf->old_external_route */ |
718e3744 | 819 | if (rn) |
820 | { | |
821 | rn->info = NULL; | |
822 | route_unlock_node (rn); | |
823 | route_unlock_node (rn); | |
824 | } | |
825 | } | |
826 | ||
827 | if (rn2) | |
828 | { | |
68980084 | 829 | /* rn2->info is stored in route node of ospf->old_external_route */ |
718e3744 | 830 | rn2->info = NULL; |
831 | route_unlock_node (rn2); | |
832 | route_unlock_node (rn2); | |
833 | } | |
834 | ||
835 | route_table_finish (tmp_old); | |
836 | } |