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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 */ | |
3d8617b8 JT |
451 | if (rn = route_node_lookup (ospf->new_table, |
452 | (struct prefix *) &p)) | |
718e3744 | 453 | { |
3d8617b8 JT |
454 | route_unlock_node(rn); |
455 | if (rn->info == NULL) | |
456 | zlog_info ("Route[External]: rn->info NULL"); | |
718e3744 | 457 | if (new) |
458 | ospf_route_free (new); | |
459 | return 0; | |
460 | } | |
718e3744 | 461 | /* Find a route to the same dest */ |
462 | /* If there is no route, create new one. */ | |
3d8617b8 JT |
463 | if (rn = route_node_lookup (ospf->new_external_route, |
464 | (struct prefix *) &p)) | |
465 | route_unlock_node(rn); | |
466 | ||
467 | if (!rn || (or = rn->info) == NULL) | |
718e3744 | 468 | { |
e40dcce1 | 469 | if (IS_DEBUG_OSPF (lsa, LSA)) |
470 | zlog_debug ("Route[External]: Adding a new route %s/%d", | |
471 | inet_ntoa (p.prefix), p.prefixlen); | |
718e3744 | 472 | |
68980084 | 473 | ospf_route_add (ospf->new_external_route, &p, new, asbr_route); |
718e3744 | 474 | |
475 | if (al->e[0].fwd_addr.s_addr) | |
476 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
477 | return 0; | |
478 | } | |
479 | else | |
480 | { | |
481 | /* (a) Intra-area and inter-area paths are always preferred | |
482 | over AS external paths. | |
483 | ||
484 | (b) Type 1 external paths are always preferred over type 2 | |
485 | external paths. When all paths are type 2 external | |
486 | paths, the paths with the smallest advertised type 2 | |
487 | metric are always preferred. */ | |
68980084 | 488 | ret = ospf_route_cmp (ospf, new, or); |
718e3744 | 489 | |
490 | /* (c) If the new AS external path is still indistinguishable | |
491 | from the current paths in the N's routing table entry, | |
492 | and RFC1583Compatibility is set to "disabled", select | |
493 | the preferred paths based on the intra-AS paths to the | |
494 | ASBR/forwarding addresses, as specified in Section | |
495 | 16.4.1. | |
496 | ||
497 | (d) If the new AS external path is still indistinguishable | |
498 | from the current paths in the N's routing table entry, | |
499 | select the preferred path based on a least cost | |
500 | comparison. Type 1 external paths are compared by | |
501 | looking at the sum of the distance to the forwarding | |
502 | address and the advertised type 1 metric (X+Y). Type 2 | |
503 | external paths advertising equal type 2 metrics are | |
504 | compared by looking at the distance to the forwarding | |
505 | addresses. | |
506 | */ | |
507 | /* New route is better */ | |
508 | if (ret < 0) | |
509 | { | |
e40dcce1 | 510 | if (IS_DEBUG_OSPF (lsa, LSA)) |
511 | zlog_debug ("Route[External]: New route is better"); | |
718e3744 | 512 | ospf_route_subst (rn, new, asbr_route); |
513 | if (al->e[0].fwd_addr.s_addr) | |
514 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
515 | or = new; | |
516 | new = NULL; | |
517 | } | |
518 | /* Old route is better */ | |
519 | else if (ret > 0) | |
520 | { | |
e40dcce1 | 521 | if (IS_DEBUG_OSPF (lsa, LSA)) |
522 | zlog_debug ("Route[External]: Old route is better"); | |
718e3744 | 523 | /* do nothing */ |
524 | } | |
525 | /* Routes are equal */ | |
526 | else | |
527 | { | |
e40dcce1 | 528 | if (IS_DEBUG_OSPF (lsa, LSA)) |
529 | zlog_debug ("Route[External]: Routes are equal"); | |
96735eea | 530 | ospf_route_copy_nexthops (or, asbr_route->paths); |
718e3744 | 531 | if (al->e[0].fwd_addr.s_addr) |
532 | ospf_ase_complete_direct_routes (or, al->e[0].fwd_addr); | |
533 | } | |
534 | } | |
535 | /* Make sure setting newly calculated ASBR route.*/ | |
536 | or->u.ext.asbr = asbr_route; | |
537 | if (new) | |
538 | ospf_route_free (new); | |
539 | ||
540 | lsa->route = or; | |
541 | return 0; | |
542 | } | |
543 | ||
4dadc291 | 544 | static int |
718e3744 | 545 | ospf_ase_route_match_same (struct route_table *rt, struct prefix *prefix, |
546 | struct ospf_route *newor) | |
547 | { | |
548 | struct route_node *rn; | |
549 | struct ospf_route *or; | |
550 | struct ospf_path *op; | |
551 | struct ospf_path *newop; | |
52dc7ee6 | 552 | struct listnode *n1; |
553 | struct listnode *n2; | |
718e3744 | 554 | |
555 | if (! rt || ! prefix) | |
556 | return 0; | |
557 | ||
558 | rn = route_node_lookup (rt, prefix); | |
559 | if (! rn) | |
560 | return 0; | |
561 | ||
562 | route_unlock_node (rn); | |
563 | ||
564 | or = rn->info; | |
565 | if (or->path_type != newor->path_type) | |
566 | return 0; | |
567 | ||
568 | switch (or->path_type) | |
569 | { | |
570 | case OSPF_PATH_TYPE1_EXTERNAL: | |
571 | if (or->cost != newor->cost) | |
572 | return 0; | |
573 | break; | |
574 | case OSPF_PATH_TYPE2_EXTERNAL: | |
575 | if ((or->cost != newor->cost) || | |
576 | (or->u.ext.type2_cost != newor->u.ext.type2_cost)) | |
577 | return 0; | |
578 | break; | |
579 | default: | |
580 | assert (0); | |
581 | return 0; | |
582 | } | |
583 | ||
96735eea | 584 | if (or->paths->count != newor->paths->count) |
718e3744 | 585 | return 0; |
586 | ||
587 | /* Check each path. */ | |
96735eea | 588 | for (n1 = listhead (or->paths), n2 = listhead (newor->paths); |
1eb8ef25 | 589 | n1 && n2; n1 = listnextnode (n1), n2 = listnextnode (n2)) |
718e3744 | 590 | { |
1eb8ef25 | 591 | op = listgetdata (n1); |
592 | newop = listgetdata (n2); | |
718e3744 | 593 | |
594 | if (! IPV4_ADDR_SAME (&op->nexthop, &newop->nexthop)) | |
595 | return 0; | |
596 | } | |
597 | return 1; | |
598 | } | |
599 | ||
4dadc291 | 600 | static int |
718e3744 | 601 | ospf_ase_compare_tables (struct route_table *new_external_route, |
602 | struct route_table *old_external_route) | |
603 | { | |
604 | struct route_node *rn, *new_rn; | |
605 | struct ospf_route *or; | |
606 | ||
607 | /* Remove deleted routes */ | |
608 | for (rn = route_top (old_external_route); rn; rn = route_next (rn)) | |
609 | if ((or = rn->info)) | |
610 | { | |
611 | if (! (new_rn = route_node_lookup (new_external_route, &rn->p))) | |
612 | ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or); | |
613 | else | |
614 | route_unlock_node (new_rn); | |
615 | } | |
616 | ||
617 | ||
618 | /* Install new routes */ | |
619 | for (rn = route_top (new_external_route); rn; rn = route_next (rn)) | |
620 | if ((or = rn->info) != NULL) | |
621 | if (! ospf_ase_route_match_same (old_external_route, &rn->p, or)) | |
622 | ospf_zebra_add ((struct prefix_ipv4 *) &rn->p, or); | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
4dadc291 | 627 | static int |
718e3744 | 628 | ospf_ase_calculate_timer (struct thread *t) |
629 | { | |
630 | struct ospf *ospf; | |
68980084 | 631 | struct ospf_lsa *lsa; |
632 | struct route_node *rn; | |
52dc7ee6 | 633 | struct listnode *node; |
68980084 | 634 | struct ospf_area *area; |
718e3744 | 635 | |
636 | ospf = THREAD_ARG (t); | |
637 | ospf->t_ase_calc = NULL; | |
638 | ||
639 | if (ospf->ase_calc) | |
640 | { | |
641 | ospf->ase_calc = 0; | |
642 | ||
643 | /* Calculate external route for each AS-external-LSA */ | |
68980084 | 644 | LSDB_LOOP (EXTERNAL_LSDB (ospf), rn, lsa) |
645 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 646 | |
718e3744 | 647 | /* This version simple adds to the table all NSSA areas */ |
68980084 | 648 | if (ospf->anyNSSA) |
1eb8ef25 | 649 | for (ALL_LIST_ELEMENTS_RO (ospf->areas, node, area)) |
718e3744 | 650 | { |
718e3744 | 651 | if (IS_DEBUG_OSPF_NSSA) |
e84cc647 | 652 | zlog_debug ("ospf_ase_calculate_timer(): looking at area %s", |
718e3744 | 653 | inet_ntoa (area->area_id)); |
654 | ||
655 | if (area->external_routing == OSPF_AREA_NSSA) | |
68980084 | 656 | LSDB_LOOP (NSSA_LSDB (area), rn, lsa) |
657 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 658 | } |
f2c80652 | 659 | /* kevinm: And add the NSSA routes in ospf_top */ |
f6386eeb | 660 | LSDB_LOOP (NSSA_LSDB (ospf),rn,lsa) |
661 | ospf_ase_calculate_route(ospf,lsa); | |
f2c80652 | 662 | |
718e3744 | 663 | /* Compare old and new external routing table and install the |
664 | difference info zebra/kernel */ | |
68980084 | 665 | ospf_ase_compare_tables (ospf->new_external_route, |
666 | ospf->old_external_route); | |
718e3744 | 667 | |
668 | /* Delete old external routing table */ | |
68980084 | 669 | ospf_route_table_free (ospf->old_external_route); |
670 | ospf->old_external_route = ospf->new_external_route; | |
671 | ospf->new_external_route = route_table_init (); | |
718e3744 | 672 | } |
673 | return 0; | |
674 | } | |
675 | ||
676 | void | |
68980084 | 677 | ospf_ase_calculate_schedule (struct ospf *ospf) |
718e3744 | 678 | { |
68980084 | 679 | if (ospf == NULL) |
718e3744 | 680 | return; |
681 | ||
68980084 | 682 | ospf->ase_calc = 1; |
718e3744 | 683 | } |
684 | ||
685 | void | |
68980084 | 686 | ospf_ase_calculate_timer_add (struct ospf *ospf) |
718e3744 | 687 | { |
68980084 | 688 | if (ospf == NULL) |
718e3744 | 689 | return; |
690 | ||
68980084 | 691 | if (! ospf->t_ase_calc) |
692 | ospf->t_ase_calc = thread_add_timer (master, ospf_ase_calculate_timer, | |
693 | ospf, OSPF_ASE_CALC_INTERVAL); | |
718e3744 | 694 | } |
695 | ||
696 | void | |
697 | ospf_ase_register_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
698 | { | |
699 | struct route_node *rn; | |
700 | struct prefix_ipv4 p; | |
52dc7ee6 | 701 | struct list *lst; |
718e3744 | 702 | struct as_external_lsa *al; |
703 | ||
704 | al = (struct as_external_lsa *) lsa->data; | |
705 | p.family = AF_INET; | |
706 | p.prefix = lsa->data->id; | |
707 | p.prefixlen = ip_masklen (al->mask); | |
708 | apply_mask_ipv4 (&p); | |
709 | ||
710 | rn = route_node_get (top->external_lsas, (struct prefix *) &p); | |
711 | if ((lst = rn->info) == NULL) | |
712 | rn->info = lst = list_new(); | |
713 | ||
714 | /* We assume that if LSA is deleted from DB | |
715 | is is also deleted from this RT */ | |
716 | ||
1fe6ed38 | 717 | listnode_add (lst, ospf_lsa_lock (lsa)); /* external_lsas lst */ |
718e3744 | 718 | } |
719 | ||
720 | void | |
721 | ospf_ase_unregister_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
722 | { | |
723 | struct route_node *rn; | |
724 | struct prefix_ipv4 p; | |
52dc7ee6 | 725 | struct list *lst; |
718e3744 | 726 | struct as_external_lsa *al; |
727 | ||
728 | al = (struct as_external_lsa *) lsa->data; | |
729 | p.family = AF_INET; | |
730 | p.prefix = lsa->data->id; | |
731 | p.prefixlen = ip_masklen (al->mask); | |
732 | apply_mask_ipv4 (&p); | |
733 | ||
734 | rn = route_node_get (top->external_lsas, (struct prefix *) &p); | |
735 | lst = rn->info; | |
718e3744 | 736 | |
718e3744 | 737 | /* XXX lst can be NULL */ |
738 | if (lst) { | |
739 | listnode_delete (lst, lsa); | |
1fe6ed38 | 740 | ospf_lsa_unlock (&lsa); /* external_lsas list */ |
718e3744 | 741 | } |
718e3744 | 742 | } |
743 | ||
744 | void | |
745 | ospf_ase_external_lsas_finish (struct route_table *rt) | |
746 | { | |
747 | struct route_node *rn; | |
748 | struct ospf_lsa *lsa; | |
52dc7ee6 | 749 | struct list *lst; |
1eb8ef25 | 750 | struct listnode *node, *nnode; |
718e3744 | 751 | |
752 | for (rn = route_top (rt); rn; rn = route_next (rn)) | |
753 | if ((lst = rn->info) != NULL) | |
754 | { | |
1eb8ef25 | 755 | for (ALL_LIST_ELEMENTS (lst, node, nnode, lsa)) |
1fe6ed38 | 756 | ospf_lsa_unlock (&lsa); /* external_lsas lst */ |
718e3744 | 757 | list_delete (lst); |
758 | } | |
1eb8ef25 | 759 | |
718e3744 | 760 | route_table_finish (rt); |
761 | } | |
762 | ||
763 | void | |
68980084 | 764 | ospf_ase_incremental_update (struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 765 | { |
52dc7ee6 | 766 | struct list *lsas; |
767 | struct listnode *node; | |
718e3744 | 768 | struct route_node *rn, *rn2; |
769 | struct prefix_ipv4 p; | |
770 | struct route_table *tmp_old; | |
771 | struct as_external_lsa *al; | |
772 | ||
773 | al = (struct as_external_lsa *) lsa->data; | |
774 | p.family = AF_INET; | |
775 | p.prefix = lsa->data->id; | |
776 | p.prefixlen = ip_masklen (al->mask); | |
777 | apply_mask_ipv4 (&p); | |
778 | ||
779 | /* if new_table is NULL, there was no spf calculation, thus | |
780 | incremental update is unneeded */ | |
68980084 | 781 | if (!ospf->new_table) |
718e3744 | 782 | return; |
783 | ||
784 | /* If there is already an intra-area or inter-area route | |
785 | to the destination, no recalculation is necessary | |
786 | (internal routes take precedence). */ | |
787 | ||
68980084 | 788 | rn = route_node_lookup (ospf->new_table, (struct prefix *) &p); |
3d8617b8 | 789 | if (rn) |
718e3744 | 790 | { |
791 | route_unlock_node (rn); | |
3d8617b8 JT |
792 | if (rn->info) |
793 | return; | |
718e3744 | 794 | } |
795 | ||
68980084 | 796 | rn = route_node_lookup (ospf->external_lsas, (struct prefix *) &p); |
718e3744 | 797 | assert (rn && rn->info); |
798 | lsas = rn->info; | |
3d8617b8 JT |
799 | route_unlock_node (rn); |
800 | ||
1eb8ef25 | 801 | for (ALL_LIST_ELEMENTS_RO (lsas, node, lsa)) |
802 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 803 | |
804 | /* prepare temporary old routing table for compare */ | |
805 | tmp_old = route_table_init (); | |
68980084 | 806 | rn = route_node_lookup (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 807 | if (rn && rn->info) |
808 | { | |
809 | rn2 = route_node_get (tmp_old, (struct prefix *) &p); | |
810 | rn2->info = rn->info; | |
811 | } | |
812 | ||
813 | /* install changes to zebra */ | |
68980084 | 814 | ospf_ase_compare_tables (ospf->new_external_route, tmp_old); |
718e3744 | 815 | |
68980084 | 816 | /* update ospf->old_external_route table */ |
718e3744 | 817 | if (rn && rn->info) |
818 | ospf_route_free ((struct ospf_route *) rn->info); | |
819 | ||
68980084 | 820 | rn2 = route_node_lookup (ospf->new_external_route, (struct prefix *) &p); |
821 | /* if new route exists, install it to ospf->old_external_route */ | |
718e3744 | 822 | if (rn2 && rn2->info) |
823 | { | |
824 | if (!rn) | |
68980084 | 825 | rn = route_node_get (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 826 | rn->info = rn2->info; |
827 | } | |
828 | else | |
829 | { | |
68980084 | 830 | /* remove route node from ospf->old_external_route */ |
718e3744 | 831 | if (rn) |
832 | { | |
833 | rn->info = NULL; | |
834 | route_unlock_node (rn); | |
835 | route_unlock_node (rn); | |
836 | } | |
837 | } | |
838 | ||
839 | if (rn2) | |
840 | { | |
68980084 | 841 | /* rn2->info is stored in route node of ospf->old_external_route */ |
718e3744 | 842 | rn2->info = NULL; |
843 | route_unlock_node (rn2); | |
844 | route_unlock_node (rn2); | |
845 | } | |
846 | ||
847 | route_table_finish (tmp_old); | |
848 | } |