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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 | ||
718e3744 | 49 | struct ospf_route * |
68980084 | 50 | ospf_find_asbr_route (struct ospf *ospf, |
51 | struct route_table *rtrs, struct prefix_ipv4 *asbr) | |
718e3744 | 52 | { |
53 | struct route_node *rn; | |
54 | struct ospf_route *or, *best = NULL; | |
52dc7ee6 | 55 | struct listnode *node; |
56 | struct list *chosen; | |
718e3744 | 57 | |
58 | /* Sanity check. */ | |
59 | if (rtrs == NULL) | |
60 | return NULL; | |
61 | ||
62 | rn = route_node_lookup (rtrs, (struct prefix *) asbr); | |
63 | if (! rn) | |
64 | return NULL; | |
65 | ||
66 | route_unlock_node (rn); | |
67 | ||
68 | chosen = list_new (); | |
69 | ||
70 | /* First try to find intra-area non-bb paths. */ | |
68980084 | 71 | if (!CHECK_FLAG (ospf->config, OSPF_RFC1583_COMPATIBLE)) |
1eb8ef25 | 72 | for (ALL_LIST_ELEMENTS_RO ((struct list *) rn->info, node, or)) |
73 | if (or->cost < OSPF_LS_INFINITY) | |
74 | if (!OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id) && | |
75 | or->path_type == OSPF_PATH_INTRA_AREA) | |
76 | listnode_add (chosen, or); | |
718e3744 | 77 | |
78 | /* If none is found -- look through all. */ | |
79 | if (listcount (chosen) == 0) | |
80 | { | |
81 | list_free (chosen); | |
82 | chosen = rn->info; | |
83 | } | |
84 | ||
85 | /* Now find the route with least cost. */ | |
1eb8ef25 | 86 | for (ALL_LIST_ELEMENTS_RO (chosen, node, or)) |
87 | if (or->cost < OSPF_LS_INFINITY) | |
88 | { | |
89 | if (best == NULL) | |
90 | best = or; | |
91 | else if (best->cost > or->cost) | |
92 | best = or; | |
93 | else if (best->cost == or->cost && | |
94 | IPV4_ADDR_CMP (&best->u.std.area_id, | |
95 | &or->u.std.area_id) < 0) | |
96 | best = or; | |
97 | } | |
718e3744 | 98 | |
99 | if (chosen != rn->info) | |
100 | list_delete (chosen); | |
101 | ||
102 | return best; | |
103 | } | |
104 | ||
105 | struct ospf_route * | |
106 | ospf_find_asbr_route_through_area (struct route_table *rtrs, | |
107 | struct prefix_ipv4 *asbr, | |
108 | struct ospf_area *area) | |
109 | { | |
110 | struct route_node *rn; | |
111 | ||
112 | /* Sanity check. */ | |
113 | if (rtrs == NULL) | |
114 | return NULL; | |
115 | ||
116 | rn = route_node_lookup (rtrs, (struct prefix *) asbr); | |
117 | ||
118 | if (rn) | |
119 | { | |
52dc7ee6 | 120 | struct listnode *node; |
718e3744 | 121 | struct ospf_route *or; |
122 | ||
123 | route_unlock_node (rn); | |
124 | ||
1eb8ef25 | 125 | for (ALL_LIST_ELEMENTS_RO ((struct list *) rn->info, node, or)) |
126 | if (IPV4_ADDR_SAME (&or->u.std.area_id, &area->area_id)) | |
127 | return or; | |
718e3744 | 128 | } |
129 | ||
130 | return NULL; | |
131 | } | |
132 | ||
4dadc291 | 133 | static void |
718e3744 | 134 | ospf_ase_complete_direct_routes (struct ospf_route *ro, struct in_addr nexthop) |
135 | { | |
52dc7ee6 | 136 | struct listnode *node; |
718e3744 | 137 | struct ospf_path *op; |
138 | ||
1eb8ef25 | 139 | for (ALL_LIST_ELEMENTS_RO (ro->paths, node, op)) |
140 | if (op->nexthop.s_addr == 0) | |
141 | op->nexthop.s_addr = nexthop.s_addr; | |
718e3744 | 142 | } |
143 | ||
4dadc291 | 144 | static int |
68980084 | 145 | ospf_ase_forward_address_check (struct ospf *ospf, struct in_addr fwd_addr) |
718e3744 | 146 | { |
52dc7ee6 | 147 | struct listnode *ifn; |
718e3744 | 148 | struct ospf_interface *oi; |
149 | ||
1eb8ef25 | 150 | for (ALL_LIST_ELEMENTS_RO (ospf->oiflist, ifn, oi)) |
151 | if (if_is_operative (oi->ifp)) | |
152 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
153 | if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &fwd_addr)) | |
154 | return 0; | |
718e3744 | 155 | |
156 | return 1; | |
157 | } | |
158 | ||
159 | /* Calculate ASBR route. */ | |
4dadc291 | 160 | static struct ospf_route * |
68980084 | 161 | ospf_ase_calculate_asbr_route (struct ospf *ospf, |
162 | struct route_table *rt_network, | |
718e3744 | 163 | struct route_table *rt_router, |
164 | struct as_external_lsa *al) | |
165 | { | |
166 | struct prefix_ipv4 asbr; | |
167 | struct ospf_route *asbr_route; | |
168 | struct route_node *rn; | |
169 | ||
170 | /* Find ASBR route from Router routing table. */ | |
171 | asbr.family = AF_INET; | |
172 | asbr.prefix = al->header.adv_router; | |
173 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
174 | apply_mask_ipv4 (&asbr); | |
175 | ||
68980084 | 176 | asbr_route = ospf_find_asbr_route (ospf, rt_router, &asbr); |
718e3744 | 177 | |
178 | if (asbr_route == NULL) | |
179 | { | |
e40dcce1 | 180 | if (IS_DEBUG_OSPF (lsa, LSA)) |
181 | zlog_debug ("ospf_ase_calculate(): Route to ASBR %s not found", | |
182 | inet_ntoa (asbr.prefix)); | |
718e3744 | 183 | return NULL; |
184 | } | |
185 | ||
186 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) | |
187 | { | |
e40dcce1 | 188 | if (IS_DEBUG_OSPF (lsa, LSA)) |
189 | zlog_debug ("ospf_ase_calculate(): Originating router is not an ASBR"); | |
718e3744 | 190 | return NULL; |
191 | } | |
192 | ||
193 | if (al->e[0].fwd_addr.s_addr != 0) | |
194 | { | |
e40dcce1 | 195 | if (IS_DEBUG_OSPF (lsa, LSA)) |
196 | zlog_debug ("ospf_ase_calculate(): " | |
197 | "Forwarding address is not 0.0.0.0."); | |
718e3744 | 198 | |
68980084 | 199 | if (! ospf_ase_forward_address_check (ospf, al->e[0].fwd_addr)) |
718e3744 | 200 | { |
e40dcce1 | 201 | if (IS_DEBUG_OSPF (lsa, LSA)) |
202 | zlog_debug ("ospf_ase_calculate(): " | |
203 | "Forwarding address is one of our addresses, Ignore."); | |
718e3744 | 204 | return NULL; |
205 | } | |
206 | ||
e40dcce1 | 207 | if (IS_DEBUG_OSPF (lsa, LSA)) |
208 | zlog_debug ("ospf_ase_calculate(): " | |
209 | "Looking up in the Network Routing Table."); | |
718e3744 | 210 | |
211 | /* Looking up the path to the fwd_addr from Network route. */ | |
212 | asbr.family = AF_INET; | |
213 | asbr.prefix = al->e[0].fwd_addr; | |
214 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
215 | ||
216 | rn = route_node_match (rt_network, (struct prefix *) &asbr); | |
217 | ||
218 | if (rn == NULL) | |
219 | { | |
e40dcce1 | 220 | if (IS_DEBUG_OSPF (lsa, LSA)) |
221 | zlog_debug ("ospf_ase_calculate(): " | |
222 | "Couldn't find a route to the forwarding address."); | |
718e3744 | 223 | return NULL; |
224 | } | |
225 | ||
226 | route_unlock_node (rn); | |
227 | ||
228 | if ((asbr_route = rn->info) == NULL) | |
229 | { | |
e40dcce1 | 230 | if (IS_DEBUG_OSPF (lsa, LSA)) |
231 | zlog_debug ("ospf_ase_calculate(): " | |
232 | "Somehow OSPF route to ASBR is lost"); | |
718e3744 | 233 | return NULL; |
234 | } | |
235 | } | |
236 | ||
237 | return asbr_route; | |
238 | } | |
239 | ||
4dadc291 | 240 | static struct ospf_route * |
718e3744 | 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 | { | |
e40dcce1 | 258 | if (IS_DEBUG_OSPF (lsa, LSA)) |
259 | zlog_debug ("Route[External]: type-1 created."); | |
718e3744 | 260 | new->path_type = OSPF_PATH_TYPE1_EXTERNAL; |
261 | new->cost = asbr_route->cost + metric; /* X + Y */ | |
262 | } | |
263 | else | |
264 | { | |
e40dcce1 | 265 | if (IS_DEBUG_OSPF (lsa, LSA)) |
266 | zlog_debug ("Route[External]: type-2 created."); | |
718e3744 | 267 | new->path_type = OSPF_PATH_TYPE2_EXTERNAL; |
268 | new->cost = asbr_route->cost; /* X */ | |
269 | new->u.ext.type2_cost = metric; /* Y */ | |
270 | } | |
271 | ||
272 | new->type = OSPF_DESTINATION_NETWORK; | |
718e3744 | 273 | new->u.ext.origin = lsa; |
274 | new->u.ext.tag = ntohl (al->e[0].route_tag); | |
275 | new->u.ext.asbr = asbr_route; | |
276 | ||
277 | assert (new != asbr_route); | |
278 | ||
279 | return new; | |
280 | } | |
281 | ||
282 | #define OSPF_ASE_CALC_INTERVAL 1 | |
283 | ||
284 | int | |
68980084 | 285 | ospf_ase_calculate_route (struct ospf *ospf, struct ospf_lsa * lsa) |
718e3744 | 286 | { |
287 | u_int32_t metric; | |
288 | struct as_external_lsa *al; | |
289 | struct ospf_route *asbr_route; | |
290 | struct prefix_ipv4 asbr, p; | |
291 | struct route_node *rn; | |
292 | struct ospf_route *new, *or; | |
293 | int ret; | |
294 | ||
295 | assert (lsa); | |
296 | al = (struct as_external_lsa *) lsa->data; | |
297 | ||
718e3744 | 298 | if (lsa->data->type == OSPF_AS_NSSA_LSA) |
299 | if (IS_DEBUG_OSPF_NSSA) | |
e84cc647 | 300 | zlog_debug ("ospf_ase_calc(): Processing Type-7"); |
718e3744 | 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) | |
e84cc647 | 306 | zlog_debug ("ospf_ase_calc(): Rejecting Local Xlt'd"); |
718e3744 | 307 | return 0; |
308 | } | |
718e3744 | 309 | |
e40dcce1 | 310 | if (IS_DEBUG_OSPF (lsa, LSA)) |
311 | zlog_debug ("Route[External]: Calculate AS-external-LSA to %s/%d", | |
312 | inet_ntoa (al->header.id), ip_masklen (al->mask)); | |
718e3744 | 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 | { | |
e40dcce1 | 317 | if (IS_DEBUG_OSPF (lsa, LSA)) |
318 | zlog_debug ("Route[External]: Metric is OSPF_LS_INFINITY"); | |
718e3744 | 319 | return 0; |
320 | } | |
321 | if (IS_LSA_MAXAGE (lsa)) | |
322 | { | |
e40dcce1 | 323 | if (IS_DEBUG_OSPF (lsa, LSA)) |
324 | zlog_debug ("Route[External]: AS-external-LSA is MAXAGE"); | |
718e3744 | 325 | return 0; |
326 | } | |
327 | ||
328 | /* (2) If the LSA was originated by the calculating router itself, | |
329 | examine the next LSA. */ | |
330 | if (IS_LSA_SELF (lsa)) | |
331 | { | |
e40dcce1 | 332 | if (IS_DEBUG_OSPF (lsa, LSA)) |
333 | zlog_debug ("Route[External]: AS-external-LSA is self originated"); | |
718e3744 | 334 | return 0; |
335 | } | |
336 | ||
337 | /* (3) Call the destination described by the LSA N. N's address is | |
338 | obtained by masking the LSA's Link State ID with the | |
339 | network/subnet mask contained in the body of the LSA. Look | |
340 | up the routing table entries (potentially one per attached | |
341 | area) for the AS boundary router (ASBR) that originated the | |
342 | LSA. If no entries exist for router ASBR (i.e., ASBR is | |
343 | unreachable), do nothing with this LSA and consider the next | |
344 | in the list. */ | |
345 | ||
346 | asbr.family = AF_INET; | |
347 | asbr.prefix = al->header.adv_router; | |
348 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
349 | apply_mask_ipv4 (&asbr); | |
350 | ||
68980084 | 351 | asbr_route = ospf_find_asbr_route (ospf, ospf->new_rtrs, &asbr); |
718e3744 | 352 | if (asbr_route == NULL) |
353 | { | |
e40dcce1 | 354 | if (IS_DEBUG_OSPF (lsa, LSA)) |
355 | zlog_debug ("Route[External]: Can't find originating ASBR route"); | |
718e3744 | 356 | return 0; |
357 | } | |
358 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) | |
359 | { | |
e40dcce1 | 360 | if (IS_DEBUG_OSPF (lsa, LSA)) |
361 | zlog_debug ("Route[External]: Originating router is not an ASBR"); | |
718e3744 | 362 | return 0; |
363 | } | |
364 | ||
365 | /* Else, this LSA describes an AS external path to destination | |
366 | N. Examine the forwarding address specified in the AS- | |
367 | external-LSA. This indicates the IP address to which | |
368 | packets for the destination should be forwarded. */ | |
369 | ||
370 | if (al->e[0].fwd_addr.s_addr == 0) | |
371 | { | |
372 | /* If the forwarding address is set to 0.0.0.0, packets should | |
373 | be sent to the ASBR itself. Among the multiple routing table | |
374 | entries for the ASBR, select the preferred entry as follows. | |
375 | If RFC1583Compatibility is set to "disabled", prune the set | |
376 | of routing table entries for the ASBR as described in | |
377 | Section 16.4.1. In any case, among the remaining routing | |
378 | table entries, select the routing table entry with the least | |
379 | cost; when there are multiple least cost routing table | |
380 | entries the entry whose associated area has the largest OSPF | |
381 | Area ID (when considered as an unsigned 32-bit integer) is | |
382 | chosen. */ | |
383 | ||
384 | /* asbr_route already contains the requested route */ | |
385 | } | |
386 | else | |
387 | { | |
388 | /* If the forwarding address is non-zero, look up the | |
389 | forwarding address in the routing table.[24] The matching | |
390 | routing table entry must specify an intra-area or inter-area | |
391 | path; if no such path exists, do nothing with the LSA and | |
392 | consider the next in the list. */ | |
68980084 | 393 | if (! ospf_ase_forward_address_check (ospf, al->e[0].fwd_addr)) |
718e3744 | 394 | { |
e40dcce1 | 395 | if (IS_DEBUG_OSPF (lsa, LSA)) |
396 | zlog_debug ("Route[External]: Forwarding address is our router " | |
397 | "address"); | |
718e3744 | 398 | return 0; |
399 | } | |
400 | ||
401 | asbr.family = AF_INET; | |
402 | asbr.prefix = al->e[0].fwd_addr; | |
403 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
404 | ||
68980084 | 405 | rn = route_node_match (ospf->new_table, (struct prefix *) &asbr); |
718e3744 | 406 | |
407 | if (rn == NULL || (asbr_route = rn->info) == NULL) | |
408 | { | |
e40dcce1 | 409 | if (IS_DEBUG_OSPF (lsa, LSA)) |
410 | zlog_debug ("Route[External]: Can't find route to forwarding " | |
411 | "address"); | |
718e3744 | 412 | if (rn) |
413 | route_unlock_node (rn); | |
414 | return 0; | |
415 | } | |
416 | ||
417 | route_unlock_node (rn); | |
418 | } | |
419 | ||
420 | /* (4) Let X be the cost specified by the preferred routing table | |
421 | entry for the ASBR/forwarding address, and Y the cost | |
422 | specified in the LSA. X is in terms of the link state | |
423 | metric, and Y is a type 1 or 2 external metric. */ | |
424 | ||
425 | ||
426 | /* (5) Look up the routing table entry for the destination N. If | |
427 | no entry exists for N, install the AS external path to N, | |
428 | with next hop equal to the list of next hops to the | |
429 | forwarding address, and advertising router equal to ASBR. | |
430 | If the external metric type is 1, then the path-type is set | |
431 | to type 1 external and the cost is equal to X+Y. If the | |
432 | external metric type is 2, the path-type is set to type 2 | |
433 | external, the link state component of the route's cost is X, | |
434 | and the type 2 cost is Y. */ | |
435 | new = ospf_ase_calculate_new_route (lsa, asbr_route, metric); | |
436 | ||
437 | /* (6) Compare the AS external path described by the LSA with the | |
438 | existing paths in N's routing table entry, as follows. If | |
439 | the new path is preferred, it replaces the present paths in | |
440 | N's routing table entry. If the new path is of equal | |
441 | preference, it is added to N's routing table entry's list of | |
442 | paths. */ | |
443 | ||
444 | /* Set prefix. */ | |
445 | p.family = AF_INET; | |
446 | p.prefix = al->header.id; | |
447 | p.prefixlen = ip_masklen (al->mask); | |
448 | ||
449 | /* if there is a Intra/Inter area route to the N | |
450 | do not install external route */ | |
68980084 | 451 | if ((rn = route_node_lookup (ospf->new_table, |
718e3744 | 452 | (struct prefix *) &p)) != NULL |
453 | && (rn->info != NULL)) | |
454 | { | |
455 | if (new) | |
456 | ospf_route_free (new); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | /* Find a route to the same dest */ | |
461 | /* If there is no route, create new one. */ | |
68980084 | 462 | if ((rn = route_node_lookup (ospf->new_external_route, |
718e3744 | 463 | (struct prefix *) &p)) == NULL |
464 | || (or = rn->info) == NULL) | |
465 | { | |
e40dcce1 | 466 | if (IS_DEBUG_OSPF (lsa, LSA)) |
467 | zlog_debug ("Route[External]: Adding a new route %s/%d", | |
468 | inet_ntoa (p.prefix), p.prefixlen); | |
718e3744 | 469 | |
68980084 | 470 | ospf_route_add (ospf->new_external_route, &p, new, asbr_route); |
718e3744 | 471 | |
472 | if (al->e[0].fwd_addr.s_addr) | |
473 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
474 | return 0; | |
475 | } | |
476 | else | |
477 | { | |
478 | /* (a) Intra-area and inter-area paths are always preferred | |
479 | over AS external paths. | |
480 | ||
481 | (b) Type 1 external paths are always preferred over type 2 | |
482 | external paths. When all paths are type 2 external | |
483 | paths, the paths with the smallest advertised type 2 | |
484 | metric are always preferred. */ | |
68980084 | 485 | ret = ospf_route_cmp (ospf, new, or); |
718e3744 | 486 | |
487 | /* (c) If the new AS external path is still indistinguishable | |
488 | from the current paths in the N's routing table entry, | |
489 | and RFC1583Compatibility is set to "disabled", select | |
490 | the preferred paths based on the intra-AS paths to the | |
491 | ASBR/forwarding addresses, as specified in Section | |
492 | 16.4.1. | |
493 | ||
494 | (d) If the new AS external path is still indistinguishable | |
495 | from the current paths in the N's routing table entry, | |
496 | select the preferred path based on a least cost | |
497 | comparison. Type 1 external paths are compared by | |
498 | looking at the sum of the distance to the forwarding | |
499 | address and the advertised type 1 metric (X+Y). Type 2 | |
500 | external paths advertising equal type 2 metrics are | |
501 | compared by looking at the distance to the forwarding | |
502 | addresses. | |
503 | */ | |
504 | /* New route is better */ | |
505 | if (ret < 0) | |
506 | { | |
e40dcce1 | 507 | if (IS_DEBUG_OSPF (lsa, LSA)) |
508 | zlog_debug ("Route[External]: New route is better"); | |
718e3744 | 509 | ospf_route_subst (rn, new, asbr_route); |
510 | if (al->e[0].fwd_addr.s_addr) | |
511 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
512 | or = new; | |
513 | new = NULL; | |
514 | } | |
515 | /* Old route is better */ | |
516 | else if (ret > 0) | |
517 | { | |
e40dcce1 | 518 | if (IS_DEBUG_OSPF (lsa, LSA)) |
519 | zlog_debug ("Route[External]: Old route is better"); | |
718e3744 | 520 | /* do nothing */ |
521 | } | |
522 | /* Routes are equal */ | |
523 | else | |
524 | { | |
e40dcce1 | 525 | if (IS_DEBUG_OSPF (lsa, LSA)) |
526 | zlog_debug ("Route[External]: Routes are equal"); | |
96735eea | 527 | ospf_route_copy_nexthops (or, asbr_route->paths); |
718e3744 | 528 | if (al->e[0].fwd_addr.s_addr) |
529 | ospf_ase_complete_direct_routes (or, al->e[0].fwd_addr); | |
530 | } | |
531 | } | |
532 | /* Make sure setting newly calculated ASBR route.*/ | |
533 | or->u.ext.asbr = asbr_route; | |
534 | if (new) | |
535 | ospf_route_free (new); | |
536 | ||
537 | lsa->route = or; | |
538 | return 0; | |
539 | } | |
540 | ||
4dadc291 | 541 | static int |
718e3744 | 542 | ospf_ase_route_match_same (struct route_table *rt, struct prefix *prefix, |
543 | struct ospf_route *newor) | |
544 | { | |
545 | struct route_node *rn; | |
546 | struct ospf_route *or; | |
547 | struct ospf_path *op; | |
548 | struct ospf_path *newop; | |
52dc7ee6 | 549 | struct listnode *n1; |
550 | struct listnode *n2; | |
718e3744 | 551 | |
552 | if (! rt || ! prefix) | |
553 | return 0; | |
554 | ||
555 | rn = route_node_lookup (rt, prefix); | |
556 | if (! rn) | |
557 | return 0; | |
558 | ||
559 | route_unlock_node (rn); | |
560 | ||
561 | or = rn->info; | |
562 | if (or->path_type != newor->path_type) | |
563 | return 0; | |
564 | ||
565 | switch (or->path_type) | |
566 | { | |
567 | case OSPF_PATH_TYPE1_EXTERNAL: | |
568 | if (or->cost != newor->cost) | |
569 | return 0; | |
570 | break; | |
571 | case OSPF_PATH_TYPE2_EXTERNAL: | |
572 | if ((or->cost != newor->cost) || | |
573 | (or->u.ext.type2_cost != newor->u.ext.type2_cost)) | |
574 | return 0; | |
575 | break; | |
576 | default: | |
577 | assert (0); | |
578 | return 0; | |
579 | } | |
580 | ||
96735eea | 581 | if (or->paths->count != newor->paths->count) |
718e3744 | 582 | return 0; |
583 | ||
584 | /* Check each path. */ | |
96735eea | 585 | for (n1 = listhead (or->paths), n2 = listhead (newor->paths); |
1eb8ef25 | 586 | n1 && n2; n1 = listnextnode (n1), n2 = listnextnode (n2)) |
718e3744 | 587 | { |
1eb8ef25 | 588 | op = listgetdata (n1); |
589 | newop = listgetdata (n2); | |
718e3744 | 590 | |
591 | if (! IPV4_ADDR_SAME (&op->nexthop, &newop->nexthop)) | |
592 | return 0; | |
593 | } | |
594 | return 1; | |
595 | } | |
596 | ||
4dadc291 | 597 | static int |
718e3744 | 598 | ospf_ase_compare_tables (struct route_table *new_external_route, |
599 | struct route_table *old_external_route) | |
600 | { | |
601 | struct route_node *rn, *new_rn; | |
602 | struct ospf_route *or; | |
603 | ||
604 | /* Remove deleted routes */ | |
605 | for (rn = route_top (old_external_route); rn; rn = route_next (rn)) | |
606 | if ((or = rn->info)) | |
607 | { | |
608 | if (! (new_rn = route_node_lookup (new_external_route, &rn->p))) | |
609 | ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or); | |
610 | else | |
611 | route_unlock_node (new_rn); | |
612 | } | |
613 | ||
614 | ||
615 | /* Install new routes */ | |
616 | for (rn = route_top (new_external_route); rn; rn = route_next (rn)) | |
617 | if ((or = rn->info) != NULL) | |
618 | if (! ospf_ase_route_match_same (old_external_route, &rn->p, or)) | |
619 | ospf_zebra_add ((struct prefix_ipv4 *) &rn->p, or); | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
4dadc291 | 624 | static int |
718e3744 | 625 | ospf_ase_calculate_timer (struct thread *t) |
626 | { | |
627 | struct ospf *ospf; | |
68980084 | 628 | struct ospf_lsa *lsa; |
629 | struct route_node *rn; | |
52dc7ee6 | 630 | struct listnode *node; |
68980084 | 631 | struct ospf_area *area; |
718e3744 | 632 | |
633 | ospf = THREAD_ARG (t); | |
634 | ospf->t_ase_calc = NULL; | |
635 | ||
636 | if (ospf->ase_calc) | |
637 | { | |
638 | ospf->ase_calc = 0; | |
639 | ||
640 | /* Calculate external route for each AS-external-LSA */ | |
68980084 | 641 | LSDB_LOOP (EXTERNAL_LSDB (ospf), rn, lsa) |
642 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 643 | |
718e3744 | 644 | /* This version simple adds to the table all NSSA areas */ |
68980084 | 645 | if (ospf->anyNSSA) |
1eb8ef25 | 646 | for (ALL_LIST_ELEMENTS_RO (ospf->areas, node, area)) |
718e3744 | 647 | { |
718e3744 | 648 | if (IS_DEBUG_OSPF_NSSA) |
e84cc647 | 649 | zlog_debug ("ospf_ase_calculate_timer(): looking at area %s", |
718e3744 | 650 | inet_ntoa (area->area_id)); |
651 | ||
652 | if (area->external_routing == OSPF_AREA_NSSA) | |
68980084 | 653 | LSDB_LOOP (NSSA_LSDB (area), rn, lsa) |
654 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 655 | } |
f2c80652 | 656 | /* kevinm: And add the NSSA routes in ospf_top */ |
f6386eeb | 657 | LSDB_LOOP (NSSA_LSDB (ospf),rn,lsa) |
658 | ospf_ase_calculate_route(ospf,lsa); | |
f2c80652 | 659 | |
718e3744 | 660 | /* Compare old and new external routing table and install the |
661 | difference info zebra/kernel */ | |
68980084 | 662 | ospf_ase_compare_tables (ospf->new_external_route, |
663 | ospf->old_external_route); | |
718e3744 | 664 | |
665 | /* Delete old external routing table */ | |
68980084 | 666 | ospf_route_table_free (ospf->old_external_route); |
667 | ospf->old_external_route = ospf->new_external_route; | |
668 | ospf->new_external_route = route_table_init (); | |
718e3744 | 669 | } |
670 | return 0; | |
671 | } | |
672 | ||
673 | void | |
68980084 | 674 | ospf_ase_calculate_schedule (struct ospf *ospf) |
718e3744 | 675 | { |
68980084 | 676 | if (ospf == NULL) |
718e3744 | 677 | return; |
678 | ||
68980084 | 679 | ospf->ase_calc = 1; |
718e3744 | 680 | } |
681 | ||
682 | void | |
68980084 | 683 | ospf_ase_calculate_timer_add (struct ospf *ospf) |
718e3744 | 684 | { |
68980084 | 685 | if (ospf == NULL) |
718e3744 | 686 | return; |
687 | ||
68980084 | 688 | if (! ospf->t_ase_calc) |
689 | ospf->t_ase_calc = thread_add_timer (master, ospf_ase_calculate_timer, | |
690 | ospf, OSPF_ASE_CALC_INTERVAL); | |
718e3744 | 691 | } |
692 | ||
693 | void | |
694 | ospf_ase_register_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
695 | { | |
696 | struct route_node *rn; | |
697 | struct prefix_ipv4 p; | |
52dc7ee6 | 698 | struct list *lst; |
718e3744 | 699 | struct as_external_lsa *al; |
700 | ||
701 | al = (struct as_external_lsa *) lsa->data; | |
702 | p.family = AF_INET; | |
703 | p.prefix = lsa->data->id; | |
704 | p.prefixlen = ip_masklen (al->mask); | |
705 | apply_mask_ipv4 (&p); | |
706 | ||
707 | rn = route_node_get (top->external_lsas, (struct prefix *) &p); | |
708 | if ((lst = rn->info) == NULL) | |
709 | rn->info = lst = list_new(); | |
710 | ||
711 | /* We assume that if LSA is deleted from DB | |
712 | is is also deleted from this RT */ | |
713 | ||
714 | listnode_add (lst, ospf_lsa_lock (lsa)); | |
715 | } | |
716 | ||
717 | void | |
718 | ospf_ase_unregister_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
719 | { | |
720 | struct route_node *rn; | |
721 | struct prefix_ipv4 p; | |
52dc7ee6 | 722 | struct list *lst; |
718e3744 | 723 | struct as_external_lsa *al; |
724 | ||
725 | al = (struct as_external_lsa *) lsa->data; | |
726 | p.family = AF_INET; | |
727 | p.prefix = lsa->data->id; | |
728 | p.prefixlen = ip_masklen (al->mask); | |
729 | apply_mask_ipv4 (&p); | |
730 | ||
731 | rn = route_node_get (top->external_lsas, (struct prefix *) &p); | |
732 | lst = rn->info; | |
733 | #ifdef ORIGINAL_CODING | |
734 | assert (lst); | |
735 | ||
736 | listnode_delete (lst, lsa); | |
737 | ospf_lsa_unlock (lsa); | |
738 | #else /* ORIGINAL_CODING */ | |
739 | /* XXX lst can be NULL */ | |
740 | if (lst) { | |
741 | listnode_delete (lst, lsa); | |
742 | ospf_lsa_unlock (lsa); | |
743 | } | |
744 | #endif /* ORIGINAL_CODING */ | |
745 | } | |
746 | ||
747 | void | |
748 | ospf_ase_external_lsas_finish (struct route_table *rt) | |
749 | { | |
750 | struct route_node *rn; | |
751 | struct ospf_lsa *lsa; | |
52dc7ee6 | 752 | struct list *lst; |
1eb8ef25 | 753 | struct listnode *node, *nnode; |
718e3744 | 754 | |
755 | for (rn = route_top (rt); rn; rn = route_next (rn)) | |
756 | if ((lst = rn->info) != NULL) | |
757 | { | |
1eb8ef25 | 758 | for (ALL_LIST_ELEMENTS (lst, node, nnode, lsa)) |
759 | ospf_lsa_unlock (lsa); | |
718e3744 | 760 | list_delete (lst); |
761 | } | |
1eb8ef25 | 762 | |
718e3744 | 763 | route_table_finish (rt); |
764 | } | |
765 | ||
766 | void | |
68980084 | 767 | ospf_ase_incremental_update (struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 768 | { |
52dc7ee6 | 769 | struct list *lsas; |
770 | struct listnode *node; | |
718e3744 | 771 | struct route_node *rn, *rn2; |
772 | struct prefix_ipv4 p; | |
773 | struct route_table *tmp_old; | |
774 | struct as_external_lsa *al; | |
775 | ||
776 | al = (struct as_external_lsa *) lsa->data; | |
777 | p.family = AF_INET; | |
778 | p.prefix = lsa->data->id; | |
779 | p.prefixlen = ip_masklen (al->mask); | |
780 | apply_mask_ipv4 (&p); | |
781 | ||
782 | /* if new_table is NULL, there was no spf calculation, thus | |
783 | incremental update is unneeded */ | |
68980084 | 784 | if (!ospf->new_table) |
718e3744 | 785 | return; |
786 | ||
787 | /* If there is already an intra-area or inter-area route | |
788 | to the destination, no recalculation is necessary | |
789 | (internal routes take precedence). */ | |
790 | ||
68980084 | 791 | rn = route_node_lookup (ospf->new_table, (struct prefix *) &p); |
718e3744 | 792 | if (rn && rn->info) |
793 | { | |
794 | route_unlock_node (rn); | |
795 | return; | |
796 | } | |
797 | ||
68980084 | 798 | rn = route_node_lookup (ospf->external_lsas, (struct prefix *) &p); |
718e3744 | 799 | assert (rn && rn->info); |
800 | lsas = rn->info; | |
801 | ||
1eb8ef25 | 802 | for (ALL_LIST_ELEMENTS_RO (lsas, node, lsa)) |
803 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 804 | |
805 | /* prepare temporary old routing table for compare */ | |
806 | tmp_old = route_table_init (); | |
68980084 | 807 | rn = route_node_lookup (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 808 | if (rn && rn->info) |
809 | { | |
810 | rn2 = route_node_get (tmp_old, (struct prefix *) &p); | |
811 | rn2->info = rn->info; | |
812 | } | |
813 | ||
814 | /* install changes to zebra */ | |
68980084 | 815 | ospf_ase_compare_tables (ospf->new_external_route, tmp_old); |
718e3744 | 816 | |
68980084 | 817 | /* update ospf->old_external_route table */ |
718e3744 | 818 | if (rn && rn->info) |
819 | ospf_route_free ((struct ospf_route *) rn->info); | |
820 | ||
68980084 | 821 | rn2 = route_node_lookup (ospf->new_external_route, (struct prefix *) &p); |
822 | /* if new route exists, install it to ospf->old_external_route */ | |
718e3744 | 823 | if (rn2 && rn2->info) |
824 | { | |
825 | if (!rn) | |
68980084 | 826 | rn = route_node_get (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 827 | rn->info = rn2->info; |
828 | } | |
829 | else | |
830 | { | |
68980084 | 831 | /* remove route node from ospf->old_external_route */ |
718e3744 | 832 | if (rn) |
833 | { | |
834 | rn->info = NULL; | |
835 | route_unlock_node (rn); | |
836 | route_unlock_node (rn); | |
837 | } | |
838 | } | |
839 | ||
840 | if (rn2) | |
841 | { | |
68980084 | 842 | /* rn2->info is stored in route node of ospf->old_external_route */ |
718e3744 | 843 | rn2->info = NULL; |
844 | route_unlock_node (rn2); | |
845 | route_unlock_node (rn2); | |
846 | } | |
847 | ||
848 | route_table_finish (tmp_old); | |
849 | } |