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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 | * | |
896014f4 DL |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
718e3744 | 20 | */ |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "thread.h" | |
25 | #include "memory.h" | |
26 | #include "hash.h" | |
27 | #include "linklist.h" | |
28 | #include "prefix.h" | |
29 | #include "if.h" | |
30 | #include "table.h" | |
31 | #include "vty.h" | |
32 | #include "log.h" | |
33 | ||
34 | #include "ospfd/ospfd.h" | |
35 | #include "ospfd/ospf_interface.h" | |
36 | #include "ospfd/ospf_ism.h" | |
37 | #include "ospfd/ospf_asbr.h" | |
38 | #include "ospfd/ospf_lsa.h" | |
39 | #include "ospfd/ospf_lsdb.h" | |
40 | #include "ospfd/ospf_neighbor.h" | |
41 | #include "ospfd/ospf_nsm.h" | |
42 | #include "ospfd/ospf_spf.h" | |
43 | #include "ospfd/ospf_route.h" | |
44 | #include "ospfd/ospf_ase.h" | |
45 | #include "ospfd/ospf_zebra.h" | |
46 | #include "ospfd/ospf_dump.h" | |
47 | ||
718e3744 | 48 | struct ospf_route * |
68980084 | 49 | ospf_find_asbr_route (struct ospf *ospf, |
50 | struct route_table *rtrs, struct prefix_ipv4 *asbr) | |
718e3744 | 51 | { |
52 | struct route_node *rn; | |
53 | struct ospf_route *or, *best = NULL; | |
52dc7ee6 | 54 | struct listnode *node; |
55 | struct list *chosen; | |
718e3744 | 56 | |
57 | /* Sanity check. */ | |
58 | if (rtrs == NULL) | |
59 | return NULL; | |
60 | ||
61 | rn = route_node_lookup (rtrs, (struct prefix *) asbr); | |
62 | if (! rn) | |
63 | return NULL; | |
64 | ||
65 | route_unlock_node (rn); | |
66 | ||
67 | chosen = list_new (); | |
68 | ||
69 | /* First try to find intra-area non-bb paths. */ | |
68980084 | 70 | if (!CHECK_FLAG (ospf->config, OSPF_RFC1583_COMPATIBLE)) |
1eb8ef25 | 71 | for (ALL_LIST_ELEMENTS_RO ((struct list *) rn->info, node, or)) |
72 | if (or->cost < OSPF_LS_INFINITY) | |
73 | if (!OSPF_IS_AREA_ID_BACKBONE (or->u.std.area_id) && | |
74 | or->path_type == OSPF_PATH_INTRA_AREA) | |
75 | listnode_add (chosen, or); | |
718e3744 | 76 | |
77 | /* If none is found -- look through all. */ | |
78 | if (listcount (chosen) == 0) | |
79 | { | |
80 | list_free (chosen); | |
81 | chosen = rn->info; | |
82 | } | |
83 | ||
84 | /* Now find the route with least cost. */ | |
1eb8ef25 | 85 | for (ALL_LIST_ELEMENTS_RO (chosen, node, or)) |
86 | if (or->cost < OSPF_LS_INFINITY) | |
87 | { | |
88 | if (best == NULL) | |
89 | best = or; | |
90 | else if (best->cost > or->cost) | |
91 | best = or; | |
92 | else if (best->cost == or->cost && | |
93 | IPV4_ADDR_CMP (&best->u.std.area_id, | |
94 | &or->u.std.area_id) < 0) | |
95 | best = or; | |
96 | } | |
718e3744 | 97 | |
98 | if (chosen != rn->info) | |
99 | list_delete (chosen); | |
100 | ||
101 | return best; | |
102 | } | |
103 | ||
104 | struct ospf_route * | |
105 | ospf_find_asbr_route_through_area (struct route_table *rtrs, | |
106 | struct prefix_ipv4 *asbr, | |
107 | struct ospf_area *area) | |
108 | { | |
109 | struct route_node *rn; | |
110 | ||
111 | /* Sanity check. */ | |
112 | if (rtrs == NULL) | |
113 | return NULL; | |
114 | ||
115 | rn = route_node_lookup (rtrs, (struct prefix *) asbr); | |
116 | ||
117 | if (rn) | |
118 | { | |
52dc7ee6 | 119 | struct listnode *node; |
718e3744 | 120 | struct ospf_route *or; |
121 | ||
122 | route_unlock_node (rn); | |
123 | ||
1eb8ef25 | 124 | for (ALL_LIST_ELEMENTS_RO ((struct list *) rn->info, node, or)) |
125 | if (IPV4_ADDR_SAME (&or->u.std.area_id, &area->area_id)) | |
126 | return or; | |
718e3744 | 127 | } |
128 | ||
129 | return NULL; | |
130 | } | |
131 | ||
4dadc291 | 132 | static void |
718e3744 | 133 | ospf_ase_complete_direct_routes (struct ospf_route *ro, struct in_addr nexthop) |
134 | { | |
52dc7ee6 | 135 | struct listnode *node; |
718e3744 | 136 | struct ospf_path *op; |
137 | ||
1eb8ef25 | 138 | for (ALL_LIST_ELEMENTS_RO (ro->paths, node, op)) |
139 | if (op->nexthop.s_addr == 0) | |
140 | op->nexthop.s_addr = nexthop.s_addr; | |
718e3744 | 141 | } |
142 | ||
4dadc291 | 143 | static int |
68980084 | 144 | ospf_ase_forward_address_check (struct ospf *ospf, struct in_addr fwd_addr) |
718e3744 | 145 | { |
52dc7ee6 | 146 | struct listnode *ifn; |
718e3744 | 147 | struct ospf_interface *oi; |
148 | ||
1eb8ef25 | 149 | for (ALL_LIST_ELEMENTS_RO (ospf->oiflist, ifn, oi)) |
150 | if (if_is_operative (oi->ifp)) | |
151 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
152 | if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &fwd_addr)) | |
153 | return 0; | |
718e3744 | 154 | |
155 | return 1; | |
156 | } | |
157 | ||
3408afe2 | 158 | #if 0 |
718e3744 | 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 | } | |
3408afe2 | 239 | #endif |
718e3744 | 240 | |
4dadc291 | 241 | static struct ospf_route * |
718e3744 | 242 | ospf_ase_calculate_new_route (struct ospf_lsa *lsa, |
243 | struct ospf_route *asbr_route, u_int32_t metric) | |
244 | { | |
245 | struct as_external_lsa *al; | |
246 | struct ospf_route *new; | |
247 | ||
248 | al = (struct as_external_lsa *) lsa->data; | |
249 | ||
250 | new = ospf_route_new (); | |
251 | ||
252 | /* Set redistributed type -- does make sense? */ | |
253 | /* new->type = type; */ | |
254 | new->id = al->header.id; | |
255 | new->mask = al->mask; | |
256 | ||
257 | if (!IS_EXTERNAL_METRIC (al->e[0].tos)) | |
258 | { | |
e40dcce1 | 259 | if (IS_DEBUG_OSPF (lsa, LSA)) |
260 | zlog_debug ("Route[External]: type-1 created."); | |
718e3744 | 261 | new->path_type = OSPF_PATH_TYPE1_EXTERNAL; |
262 | new->cost = asbr_route->cost + metric; /* X + Y */ | |
263 | } | |
264 | else | |
265 | { | |
e40dcce1 | 266 | if (IS_DEBUG_OSPF (lsa, LSA)) |
267 | zlog_debug ("Route[External]: type-2 created."); | |
718e3744 | 268 | new->path_type = OSPF_PATH_TYPE2_EXTERNAL; |
269 | new->cost = asbr_route->cost; /* X */ | |
270 | new->u.ext.type2_cost = metric; /* Y */ | |
271 | } | |
272 | ||
273 | new->type = OSPF_DESTINATION_NETWORK; | |
718e3744 | 274 | new->u.ext.origin = lsa; |
275 | new->u.ext.tag = ntohl (al->e[0].route_tag); | |
276 | new->u.ext.asbr = asbr_route; | |
277 | ||
278 | assert (new != asbr_route); | |
279 | ||
280 | return new; | |
281 | } | |
282 | ||
283 | #define OSPF_ASE_CALC_INTERVAL 1 | |
284 | ||
285 | int | |
68980084 | 286 | ospf_ase_calculate_route (struct ospf *ospf, struct ospf_lsa * lsa) |
718e3744 | 287 | { |
288 | u_int32_t metric; | |
289 | struct as_external_lsa *al; | |
290 | struct ospf_route *asbr_route; | |
291 | struct prefix_ipv4 asbr, p; | |
292 | struct route_node *rn; | |
293 | struct ospf_route *new, *or; | |
294 | int ret; | |
295 | ||
296 | assert (lsa); | |
297 | al = (struct as_external_lsa *) lsa->data; | |
298 | ||
718e3744 | 299 | if (lsa->data->type == OSPF_AS_NSSA_LSA) |
300 | if (IS_DEBUG_OSPF_NSSA) | |
e84cc647 | 301 | zlog_debug ("ospf_ase_calc(): Processing Type-7"); |
718e3744 | 302 | |
303 | /* Stay away from any Local Translated Type-7 LSAs */ | |
304 | if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
305 | { | |
306 | if (IS_DEBUG_OSPF_NSSA) | |
e84cc647 | 307 | zlog_debug ("ospf_ase_calc(): Rejecting Local Xlt'd"); |
718e3744 | 308 | return 0; |
309 | } | |
718e3744 | 310 | |
e40dcce1 | 311 | if (IS_DEBUG_OSPF (lsa, LSA)) |
312 | zlog_debug ("Route[External]: Calculate AS-external-LSA to %s/%d", | |
313 | inet_ntoa (al->header.id), ip_masklen (al->mask)); | |
718e3744 | 314 | /* (1) If the cost specified by the LSA is LSInfinity, or if the |
315 | LSA's LS age is equal to MaxAge, then examine the next LSA. */ | |
316 | if ((metric = GET_METRIC (al->e[0].metric)) >= OSPF_LS_INFINITY) | |
317 | { | |
e40dcce1 | 318 | if (IS_DEBUG_OSPF (lsa, LSA)) |
319 | zlog_debug ("Route[External]: Metric is OSPF_LS_INFINITY"); | |
718e3744 | 320 | return 0; |
321 | } | |
322 | if (IS_LSA_MAXAGE (lsa)) | |
323 | { | |
e40dcce1 | 324 | if (IS_DEBUG_OSPF (lsa, LSA)) |
325 | zlog_debug ("Route[External]: AS-external-LSA is MAXAGE"); | |
718e3744 | 326 | return 0; |
327 | } | |
328 | ||
329 | /* (2) If the LSA was originated by the calculating router itself, | |
330 | examine the next LSA. */ | |
331 | if (IS_LSA_SELF (lsa)) | |
332 | { | |
e40dcce1 | 333 | if (IS_DEBUG_OSPF (lsa, LSA)) |
334 | zlog_debug ("Route[External]: AS-external-LSA is self originated"); | |
718e3744 | 335 | return 0; |
336 | } | |
337 | ||
338 | /* (3) Call the destination described by the LSA N. N's address is | |
339 | obtained by masking the LSA's Link State ID with the | |
340 | network/subnet mask contained in the body of the LSA. Look | |
341 | up the routing table entries (potentially one per attached | |
342 | area) for the AS boundary router (ASBR) that originated the | |
343 | LSA. If no entries exist for router ASBR (i.e., ASBR is | |
344 | unreachable), do nothing with this LSA and consider the next | |
345 | in the list. */ | |
346 | ||
347 | asbr.family = AF_INET; | |
348 | asbr.prefix = al->header.adv_router; | |
349 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
350 | apply_mask_ipv4 (&asbr); | |
351 | ||
68980084 | 352 | asbr_route = ospf_find_asbr_route (ospf, ospf->new_rtrs, &asbr); |
718e3744 | 353 | if (asbr_route == NULL) |
354 | { | |
e40dcce1 | 355 | if (IS_DEBUG_OSPF (lsa, LSA)) |
356 | zlog_debug ("Route[External]: Can't find originating ASBR route"); | |
718e3744 | 357 | return 0; |
358 | } | |
359 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) | |
360 | { | |
e40dcce1 | 361 | if (IS_DEBUG_OSPF (lsa, LSA)) |
362 | zlog_debug ("Route[External]: Originating router is not an ASBR"); | |
718e3744 | 363 | return 0; |
364 | } | |
365 | ||
366 | /* Else, this LSA describes an AS external path to destination | |
367 | N. Examine the forwarding address specified in the AS- | |
368 | external-LSA. This indicates the IP address to which | |
369 | packets for the destination should be forwarded. */ | |
370 | ||
371 | if (al->e[0].fwd_addr.s_addr == 0) | |
372 | { | |
373 | /* If the forwarding address is set to 0.0.0.0, packets should | |
374 | be sent to the ASBR itself. Among the multiple routing table | |
375 | entries for the ASBR, select the preferred entry as follows. | |
376 | If RFC1583Compatibility is set to "disabled", prune the set | |
377 | of routing table entries for the ASBR as described in | |
378 | Section 16.4.1. In any case, among the remaining routing | |
379 | table entries, select the routing table entry with the least | |
380 | cost; when there are multiple least cost routing table | |
381 | entries the entry whose associated area has the largest OSPF | |
382 | Area ID (when considered as an unsigned 32-bit integer) is | |
383 | chosen. */ | |
384 | ||
385 | /* asbr_route already contains the requested route */ | |
386 | } | |
387 | else | |
388 | { | |
389 | /* If the forwarding address is non-zero, look up the | |
390 | forwarding address in the routing table.[24] The matching | |
391 | routing table entry must specify an intra-area or inter-area | |
392 | path; if no such path exists, do nothing with the LSA and | |
393 | consider the next in the list. */ | |
68980084 | 394 | if (! ospf_ase_forward_address_check (ospf, al->e[0].fwd_addr)) |
718e3744 | 395 | { |
e40dcce1 | 396 | if (IS_DEBUG_OSPF (lsa, LSA)) |
397 | zlog_debug ("Route[External]: Forwarding address is our router " | |
398 | "address"); | |
718e3744 | 399 | return 0; |
400 | } | |
401 | ||
402 | asbr.family = AF_INET; | |
403 | asbr.prefix = al->e[0].fwd_addr; | |
404 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
405 | ||
68980084 | 406 | rn = route_node_match (ospf->new_table, (struct prefix *) &asbr); |
718e3744 | 407 | |
408 | if (rn == NULL || (asbr_route = rn->info) == NULL) | |
409 | { | |
e40dcce1 | 410 | if (IS_DEBUG_OSPF (lsa, LSA)) |
411 | zlog_debug ("Route[External]: Can't find route to forwarding " | |
412 | "address"); | |
718e3744 | 413 | if (rn) |
414 | route_unlock_node (rn); | |
415 | return 0; | |
416 | } | |
417 | ||
418 | route_unlock_node (rn); | |
419 | } | |
420 | ||
421 | /* (4) Let X be the cost specified by the preferred routing table | |
422 | entry for the ASBR/forwarding address, and Y the cost | |
423 | specified in the LSA. X is in terms of the link state | |
424 | metric, and Y is a type 1 or 2 external metric. */ | |
425 | ||
426 | ||
427 | /* (5) Look up the routing table entry for the destination N. If | |
428 | no entry exists for N, install the AS external path to N, | |
429 | with next hop equal to the list of next hops to the | |
430 | forwarding address, and advertising router equal to ASBR. | |
431 | If the external metric type is 1, then the path-type is set | |
432 | to type 1 external and the cost is equal to X+Y. If the | |
433 | external metric type is 2, the path-type is set to type 2 | |
434 | external, the link state component of the route's cost is X, | |
435 | and the type 2 cost is Y. */ | |
436 | new = ospf_ase_calculate_new_route (lsa, asbr_route, metric); | |
437 | ||
438 | /* (6) Compare the AS external path described by the LSA with the | |
439 | existing paths in N's routing table entry, as follows. If | |
440 | the new path is preferred, it replaces the present paths in | |
441 | N's routing table entry. If the new path is of equal | |
442 | preference, it is added to N's routing table entry's list of | |
443 | paths. */ | |
444 | ||
445 | /* Set prefix. */ | |
446 | p.family = AF_INET; | |
447 | p.prefix = al->header.id; | |
448 | p.prefixlen = ip_masklen (al->mask); | |
449 | ||
450 | /* if there is a Intra/Inter area route to the N | |
451 | do not install external route */ | |
e8f22261 PJ |
452 | if ((rn = route_node_lookup (ospf->new_table, |
453 | (struct prefix *) &p))) | |
718e3744 | 454 | { |
3d8617b8 JT |
455 | route_unlock_node(rn); |
456 | if (rn->info == NULL) | |
457 | zlog_info ("Route[External]: rn->info NULL"); | |
718e3744 | 458 | if (new) |
459 | ospf_route_free (new); | |
460 | return 0; | |
461 | } | |
718e3744 | 462 | /* Find a route to the same dest */ |
463 | /* If there is no route, create new one. */ | |
e8f22261 PJ |
464 | if ((rn = route_node_lookup (ospf->new_external_route, |
465 | (struct prefix *) &p))) | |
3d8617b8 JT |
466 | route_unlock_node(rn); |
467 | ||
468 | if (!rn || (or = rn->info) == NULL) | |
718e3744 | 469 | { |
e40dcce1 | 470 | if (IS_DEBUG_OSPF (lsa, LSA)) |
471 | zlog_debug ("Route[External]: Adding a new route %s/%d", | |
472 | inet_ntoa (p.prefix), p.prefixlen); | |
718e3744 | 473 | |
68980084 | 474 | ospf_route_add (ospf->new_external_route, &p, new, asbr_route); |
718e3744 | 475 | |
476 | if (al->e[0].fwd_addr.s_addr) | |
477 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
478 | return 0; | |
479 | } | |
480 | else | |
481 | { | |
482 | /* (a) Intra-area and inter-area paths are always preferred | |
483 | over AS external paths. | |
484 | ||
485 | (b) Type 1 external paths are always preferred over type 2 | |
486 | external paths. When all paths are type 2 external | |
487 | paths, the paths with the smallest advertised type 2 | |
488 | metric are always preferred. */ | |
68980084 | 489 | ret = ospf_route_cmp (ospf, new, or); |
718e3744 | 490 | |
491 | /* (c) If the new AS external path is still indistinguishable | |
492 | from the current paths in the N's routing table entry, | |
493 | and RFC1583Compatibility is set to "disabled", select | |
494 | the preferred paths based on the intra-AS paths to the | |
495 | ASBR/forwarding addresses, as specified in Section | |
496 | 16.4.1. | |
497 | ||
498 | (d) If the new AS external path is still indistinguishable | |
499 | from the current paths in the N's routing table entry, | |
500 | select the preferred path based on a least cost | |
501 | comparison. Type 1 external paths are compared by | |
502 | looking at the sum of the distance to the forwarding | |
503 | address and the advertised type 1 metric (X+Y). Type 2 | |
504 | external paths advertising equal type 2 metrics are | |
505 | compared by looking at the distance to the forwarding | |
506 | addresses. | |
507 | */ | |
508 | /* New route is better */ | |
509 | if (ret < 0) | |
510 | { | |
e40dcce1 | 511 | if (IS_DEBUG_OSPF (lsa, LSA)) |
512 | zlog_debug ("Route[External]: New route is better"); | |
718e3744 | 513 | ospf_route_subst (rn, new, asbr_route); |
514 | if (al->e[0].fwd_addr.s_addr) | |
515 | ospf_ase_complete_direct_routes (new, al->e[0].fwd_addr); | |
516 | or = new; | |
517 | new = NULL; | |
518 | } | |
519 | /* Old route is better */ | |
520 | else if (ret > 0) | |
521 | { | |
e40dcce1 | 522 | if (IS_DEBUG_OSPF (lsa, LSA)) |
523 | zlog_debug ("Route[External]: Old route is better"); | |
718e3744 | 524 | /* do nothing */ |
525 | } | |
526 | /* Routes are equal */ | |
527 | else | |
528 | { | |
e40dcce1 | 529 | if (IS_DEBUG_OSPF (lsa, LSA)) |
530 | zlog_debug ("Route[External]: Routes are equal"); | |
96735eea | 531 | ospf_route_copy_nexthops (or, asbr_route->paths); |
718e3744 | 532 | if (al->e[0].fwd_addr.s_addr) |
533 | ospf_ase_complete_direct_routes (or, al->e[0].fwd_addr); | |
534 | } | |
535 | } | |
536 | /* Make sure setting newly calculated ASBR route.*/ | |
537 | or->u.ext.asbr = asbr_route; | |
538 | if (new) | |
539 | ospf_route_free (new); | |
540 | ||
541 | lsa->route = or; | |
542 | return 0; | |
543 | } | |
544 | ||
4dadc291 | 545 | static int |
718e3744 | 546 | ospf_ase_route_match_same (struct route_table *rt, struct prefix *prefix, |
547 | struct ospf_route *newor) | |
548 | { | |
549 | struct route_node *rn; | |
550 | struct ospf_route *or; | |
551 | struct ospf_path *op; | |
552 | struct ospf_path *newop; | |
52dc7ee6 | 553 | struct listnode *n1; |
554 | struct listnode *n2; | |
718e3744 | 555 | |
556 | if (! rt || ! prefix) | |
557 | return 0; | |
558 | ||
559 | rn = route_node_lookup (rt, prefix); | |
560 | if (! rn) | |
561 | return 0; | |
562 | ||
563 | route_unlock_node (rn); | |
564 | ||
565 | or = rn->info; | |
566 | if (or->path_type != newor->path_type) | |
567 | return 0; | |
568 | ||
569 | switch (or->path_type) | |
570 | { | |
571 | case OSPF_PATH_TYPE1_EXTERNAL: | |
572 | if (or->cost != newor->cost) | |
573 | return 0; | |
574 | break; | |
575 | case OSPF_PATH_TYPE2_EXTERNAL: | |
576 | if ((or->cost != newor->cost) || | |
577 | (or->u.ext.type2_cost != newor->u.ext.type2_cost)) | |
578 | return 0; | |
579 | break; | |
580 | default: | |
581 | assert (0); | |
582 | return 0; | |
583 | } | |
584 | ||
96735eea | 585 | if (or->paths->count != newor->paths->count) |
718e3744 | 586 | return 0; |
587 | ||
588 | /* Check each path. */ | |
96735eea | 589 | for (n1 = listhead (or->paths), n2 = listhead (newor->paths); |
1eb8ef25 | 590 | n1 && n2; n1 = listnextnode (n1), n2 = listnextnode (n2)) |
718e3744 | 591 | { |
1eb8ef25 | 592 | op = listgetdata (n1); |
593 | newop = listgetdata (n2); | |
718e3744 | 594 | |
595 | if (! IPV4_ADDR_SAME (&op->nexthop, &newop->nexthop)) | |
596 | return 0; | |
a8ba847f | 597 | if (op->ifindex != newop->ifindex) |
77a1c4e0 | 598 | return 0; |
718e3744 | 599 | } |
e7331dea CF |
600 | |
601 | if (or->u.ext.tag != newor->u.ext.tag) | |
602 | return 0; | |
603 | ||
718e3744 | 604 | return 1; |
605 | } | |
606 | ||
4dadc291 | 607 | static int |
718e3744 | 608 | ospf_ase_compare_tables (struct route_table *new_external_route, |
609 | struct route_table *old_external_route) | |
610 | { | |
611 | struct route_node *rn, *new_rn; | |
612 | struct ospf_route *or; | |
613 | ||
614 | /* Remove deleted routes */ | |
615 | for (rn = route_top (old_external_route); rn; rn = route_next (rn)) | |
616 | if ((or = rn->info)) | |
617 | { | |
618 | if (! (new_rn = route_node_lookup (new_external_route, &rn->p))) | |
619 | ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or); | |
620 | else | |
621 | route_unlock_node (new_rn); | |
622 | } | |
623 | ||
624 | ||
625 | /* Install new routes */ | |
626 | for (rn = route_top (new_external_route); rn; rn = route_next (rn)) | |
627 | if ((or = rn->info) != NULL) | |
628 | if (! ospf_ase_route_match_same (old_external_route, &rn->p, or)) | |
629 | ospf_zebra_add ((struct prefix_ipv4 *) &rn->p, or); | |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
4dadc291 | 634 | static int |
718e3744 | 635 | ospf_ase_calculate_timer (struct thread *t) |
636 | { | |
637 | struct ospf *ospf; | |
68980084 | 638 | struct ospf_lsa *lsa; |
639 | struct route_node *rn; | |
52dc7ee6 | 640 | struct listnode *node; |
68980084 | 641 | struct ospf_area *area; |
cf744958 | 642 | struct timeval start_time, stop_time; |
718e3744 | 643 | |
644 | ospf = THREAD_ARG (t); | |
645 | ospf->t_ase_calc = NULL; | |
646 | ||
647 | if (ospf->ase_calc) | |
648 | { | |
649 | ospf->ase_calc = 0; | |
650 | ||
cf672a86 | 651 | monotime(&start_time); |
cf744958 | 652 | |
718e3744 | 653 | /* Calculate external route for each AS-external-LSA */ |
68980084 | 654 | LSDB_LOOP (EXTERNAL_LSDB (ospf), rn, lsa) |
655 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 656 | |
718e3744 | 657 | /* This version simple adds to the table all NSSA areas */ |
68980084 | 658 | if (ospf->anyNSSA) |
1eb8ef25 | 659 | for (ALL_LIST_ELEMENTS_RO (ospf->areas, node, area)) |
718e3744 | 660 | { |
718e3744 | 661 | if (IS_DEBUG_OSPF_NSSA) |
e84cc647 | 662 | zlog_debug ("ospf_ase_calculate_timer(): looking at area %s", |
718e3744 | 663 | inet_ntoa (area->area_id)); |
664 | ||
665 | if (area->external_routing == OSPF_AREA_NSSA) | |
68980084 | 666 | LSDB_LOOP (NSSA_LSDB (area), rn, lsa) |
667 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 668 | } |
f2c80652 | 669 | /* kevinm: And add the NSSA routes in ospf_top */ |
f6386eeb | 670 | LSDB_LOOP (NSSA_LSDB (ospf),rn,lsa) |
671 | ospf_ase_calculate_route(ospf,lsa); | |
f2c80652 | 672 | |
718e3744 | 673 | /* Compare old and new external routing table and install the |
674 | difference info zebra/kernel */ | |
68980084 | 675 | ospf_ase_compare_tables (ospf->new_external_route, |
676 | ospf->old_external_route); | |
718e3744 | 677 | |
678 | /* Delete old external routing table */ | |
68980084 | 679 | ospf_route_table_free (ospf->old_external_route); |
680 | ospf->old_external_route = ospf->new_external_route; | |
681 | ospf->new_external_route = route_table_init (); | |
cf744958 | 682 | |
cf672a86 | 683 | monotime(&stop_time); |
cf744958 | 684 | |
8f2c16aa DL |
685 | zlog_info ("SPF Processing Time(usecs): External Routes: %lld\n", |
686 | (stop_time.tv_sec - start_time.tv_sec)*1000000LL+ | |
cf744958 | 687 | (stop_time.tv_usec - start_time.tv_usec)); |
718e3744 | 688 | } |
689 | return 0; | |
690 | } | |
691 | ||
692 | void | |
68980084 | 693 | ospf_ase_calculate_schedule (struct ospf *ospf) |
718e3744 | 694 | { |
68980084 | 695 | if (ospf == NULL) |
718e3744 | 696 | return; |
697 | ||
68980084 | 698 | ospf->ase_calc = 1; |
718e3744 | 699 | } |
700 | ||
701 | void | |
68980084 | 702 | ospf_ase_calculate_timer_add (struct ospf *ospf) |
718e3744 | 703 | { |
68980084 | 704 | if (ospf == NULL) |
718e3744 | 705 | return; |
706 | ||
ffa2c898 QY |
707 | thread_add_timer(master, ospf_ase_calculate_timer, ospf, |
708 | OSPF_ASE_CALC_INTERVAL, &ospf->t_ase_calc); | |
718e3744 | 709 | } |
710 | ||
711 | void | |
712 | ospf_ase_register_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
713 | { | |
714 | struct route_node *rn; | |
715 | struct prefix_ipv4 p; | |
52dc7ee6 | 716 | struct list *lst; |
718e3744 | 717 | struct as_external_lsa *al; |
718 | ||
719 | al = (struct as_external_lsa *) lsa->data; | |
720 | p.family = AF_INET; | |
721 | p.prefix = lsa->data->id; | |
722 | p.prefixlen = ip_masklen (al->mask); | |
723 | apply_mask_ipv4 (&p); | |
724 | ||
725 | rn = route_node_get (top->external_lsas, (struct prefix *) &p); | |
726 | if ((lst = rn->info) == NULL) | |
727 | rn->info = lst = list_new(); | |
d8d939a6 JT |
728 | else |
729 | route_unlock_node (rn); | |
718e3744 | 730 | |
731 | /* We assume that if LSA is deleted from DB | |
732 | is is also deleted from this RT */ | |
1fe6ed38 | 733 | listnode_add (lst, ospf_lsa_lock (lsa)); /* external_lsas lst */ |
718e3744 | 734 | } |
735 | ||
736 | void | |
737 | ospf_ase_unregister_external_lsa (struct ospf_lsa *lsa, struct ospf *top) | |
738 | { | |
739 | struct route_node *rn; | |
740 | struct prefix_ipv4 p; | |
52dc7ee6 | 741 | struct list *lst; |
718e3744 | 742 | struct as_external_lsa *al; |
743 | ||
744 | al = (struct as_external_lsa *) lsa->data; | |
745 | p.family = AF_INET; | |
746 | p.prefix = lsa->data->id; | |
747 | p.prefixlen = ip_masklen (al->mask); | |
748 | apply_mask_ipv4 (&p); | |
749 | ||
d8d939a6 | 750 | rn = route_node_lookup (top->external_lsas, (struct prefix *) &p); |
718e3744 | 751 | |
d8d939a6 JT |
752 | if (rn) { |
753 | lst = rn->info; | |
718e3744 | 754 | listnode_delete (lst, lsa); |
1fe6ed38 | 755 | ospf_lsa_unlock (&lsa); /* external_lsas list */ |
d8d939a6 | 756 | route_unlock_node (rn); |
718e3744 | 757 | } |
718e3744 | 758 | } |
759 | ||
760 | void | |
761 | ospf_ase_external_lsas_finish (struct route_table *rt) | |
762 | { | |
763 | struct route_node *rn; | |
764 | struct ospf_lsa *lsa; | |
52dc7ee6 | 765 | struct list *lst; |
1eb8ef25 | 766 | struct listnode *node, *nnode; |
718e3744 | 767 | |
768 | for (rn = route_top (rt); rn; rn = route_next (rn)) | |
769 | if ((lst = rn->info) != NULL) | |
770 | { | |
1eb8ef25 | 771 | for (ALL_LIST_ELEMENTS (lst, node, nnode, lsa)) |
1fe6ed38 | 772 | ospf_lsa_unlock (&lsa); /* external_lsas lst */ |
718e3744 | 773 | list_delete (lst); |
774 | } | |
1eb8ef25 | 775 | |
718e3744 | 776 | route_table_finish (rt); |
777 | } | |
778 | ||
779 | void | |
68980084 | 780 | ospf_ase_incremental_update (struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 781 | { |
52dc7ee6 | 782 | struct list *lsas; |
783 | struct listnode *node; | |
718e3744 | 784 | struct route_node *rn, *rn2; |
785 | struct prefix_ipv4 p; | |
786 | struct route_table *tmp_old; | |
787 | struct as_external_lsa *al; | |
788 | ||
789 | al = (struct as_external_lsa *) lsa->data; | |
790 | p.family = AF_INET; | |
791 | p.prefix = lsa->data->id; | |
792 | p.prefixlen = ip_masklen (al->mask); | |
793 | apply_mask_ipv4 (&p); | |
794 | ||
795 | /* if new_table is NULL, there was no spf calculation, thus | |
796 | incremental update is unneeded */ | |
68980084 | 797 | if (!ospf->new_table) |
718e3744 | 798 | return; |
799 | ||
800 | /* If there is already an intra-area or inter-area route | |
801 | to the destination, no recalculation is necessary | |
802 | (internal routes take precedence). */ | |
803 | ||
68980084 | 804 | rn = route_node_lookup (ospf->new_table, (struct prefix *) &p); |
3d8617b8 | 805 | if (rn) |
718e3744 | 806 | { |
807 | route_unlock_node (rn); | |
3d8617b8 JT |
808 | if (rn->info) |
809 | return; | |
718e3744 | 810 | } |
811 | ||
68980084 | 812 | rn = route_node_lookup (ospf->external_lsas, (struct prefix *) &p); |
e8f22261 PJ |
813 | assert (rn); |
814 | assert (rn->info); | |
718e3744 | 815 | lsas = rn->info; |
3d8617b8 JT |
816 | route_unlock_node (rn); |
817 | ||
1eb8ef25 | 818 | for (ALL_LIST_ELEMENTS_RO (lsas, node, lsa)) |
819 | ospf_ase_calculate_route (ospf, lsa); | |
718e3744 | 820 | |
821 | /* prepare temporary old routing table for compare */ | |
822 | tmp_old = route_table_init (); | |
68980084 | 823 | rn = route_node_lookup (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 824 | if (rn && rn->info) |
825 | { | |
826 | rn2 = route_node_get (tmp_old, (struct prefix *) &p); | |
827 | rn2->info = rn->info; | |
58a1e062 | 828 | route_unlock_node (rn); |
718e3744 | 829 | } |
830 | ||
831 | /* install changes to zebra */ | |
68980084 | 832 | ospf_ase_compare_tables (ospf->new_external_route, tmp_old); |
718e3744 | 833 | |
68980084 | 834 | /* update ospf->old_external_route table */ |
718e3744 | 835 | if (rn && rn->info) |
836 | ospf_route_free ((struct ospf_route *) rn->info); | |
837 | ||
68980084 | 838 | rn2 = route_node_lookup (ospf->new_external_route, (struct prefix *) &p); |
839 | /* if new route exists, install it to ospf->old_external_route */ | |
718e3744 | 840 | if (rn2 && rn2->info) |
841 | { | |
842 | if (!rn) | |
68980084 | 843 | rn = route_node_get (ospf->old_external_route, (struct prefix *) &p); |
718e3744 | 844 | rn->info = rn2->info; |
845 | } | |
846 | else | |
847 | { | |
68980084 | 848 | /* remove route node from ospf->old_external_route */ |
718e3744 | 849 | if (rn) |
850 | { | |
851 | rn->info = NULL; | |
852 | route_unlock_node (rn); | |
718e3744 | 853 | } |
854 | } | |
855 | ||
856 | if (rn2) | |
857 | { | |
68980084 | 858 | /* rn2->info is stored in route node of ospf->old_external_route */ |
718e3744 | 859 | rn2->info = NULL; |
860 | route_unlock_node (rn2); | |
861 | route_unlock_node (rn2); | |
862 | } | |
863 | ||
864 | route_table_finish (tmp_old); | |
865 | } |