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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 | ||
d62a17ae | 48 | struct ospf_route *ospf_find_asbr_route(struct ospf *ospf, |
49 | struct route_table *rtrs, | |
50 | struct prefix_ipv4 *asbr) | |
718e3744 | 51 | { |
d62a17ae | 52 | struct route_node *rn; |
53 | struct ospf_route * or, *best = NULL; | |
54 | struct listnode *node; | |
55 | struct list *chosen; | |
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. */ | |
70 | if (!CHECK_FLAG(ospf->config, OSPF_RFC1583_COMPATIBLE)) | |
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 | && | |
75 | or->path_type == OSPF_PATH_INTRA_AREA) | |
76 | listnode_add(chosen, or); | |
77 | ||
78 | /* If none is found -- look through all. */ | |
79 | if (listcount(chosen) == 0) { | |
acdf5e25 | 80 | list_delete_and_null(&chosen); |
d62a17ae | 81 | chosen = rn->info; |
82 | } | |
718e3744 | 83 | |
d62a17ae | 84 | /* Now find the route with least cost. */ |
85 | for (ALL_LIST_ELEMENTS_RO(chosen, node, or)) | |
86 | if (or->cost < OSPF_LS_INFINITY) { | |
87 | if (best == NULL) | |
88 | best = or ; | |
89 | else if (best->cost > or->cost) | |
90 | best = or ; | |
91 | else if (best->cost == | |
92 | or->cost | |
93 | && IPV4_ADDR_CMP( | |
94 | &best->u.std.area_id, | |
95 | & or->u.std.area_id) | |
96 | < 0) | |
97 | best = or ; | |
98 | } | |
99 | ||
100 | if (chosen != rn->info) | |
affe9e99 | 101 | list_delete_and_null(&chosen); |
d62a17ae | 102 | |
103 | return best; | |
718e3744 | 104 | } |
105 | ||
d62a17ae | 106 | struct ospf_route *ospf_find_asbr_route_through_area(struct route_table *rtrs, |
107 | struct prefix_ipv4 *asbr, | |
108 | struct ospf_area *area) | |
718e3744 | 109 | { |
d62a17ae | 110 | struct route_node *rn; |
718e3744 | 111 | |
d62a17ae | 112 | /* Sanity check. */ |
113 | if (rtrs == NULL) | |
114 | return NULL; | |
718e3744 | 115 | |
d62a17ae | 116 | rn = route_node_lookup(rtrs, (struct prefix *)asbr); |
718e3744 | 117 | |
d62a17ae | 118 | if (rn) { |
119 | struct listnode *node; | |
120 | struct ospf_route * or ; | |
718e3744 | 121 | |
d62a17ae | 122 | route_unlock_node(rn); |
123 | ||
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 ; | |
127 | } | |
718e3744 | 128 | |
d62a17ae | 129 | return NULL; |
718e3744 | 130 | } |
131 | ||
d62a17ae | 132 | static void ospf_ase_complete_direct_routes(struct ospf_route *ro, |
133 | struct in_addr nexthop) | |
718e3744 | 134 | { |
d62a17ae | 135 | struct listnode *node; |
136 | struct ospf_path *op; | |
718e3744 | 137 | |
d62a17ae | 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 | ||
d62a17ae | 143 | static int ospf_ase_forward_address_check(struct ospf *ospf, |
144 | struct in_addr fwd_addr) | |
718e3744 | 145 | { |
d62a17ae | 146 | struct listnode *ifn; |
147 | struct ospf_interface *oi; | |
148 | ||
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, | |
153 | &fwd_addr)) | |
154 | return 0; | |
155 | ||
156 | return 1; | |
718e3744 | 157 | } |
158 | ||
3408afe2 | 159 | #if 0 |
718e3744 | 160 | /* Calculate ASBR route. */ |
4dadc291 | 161 | static struct ospf_route * |
68980084 | 162 | ospf_ase_calculate_asbr_route (struct ospf *ospf, |
163 | struct route_table *rt_network, | |
718e3744 | 164 | struct route_table *rt_router, |
165 | struct as_external_lsa *al) | |
166 | { | |
167 | struct prefix_ipv4 asbr; | |
168 | struct ospf_route *asbr_route; | |
169 | struct route_node *rn; | |
170 | ||
171 | /* Find ASBR route from Router routing table. */ | |
172 | asbr.family = AF_INET; | |
173 | asbr.prefix = al->header.adv_router; | |
174 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
175 | apply_mask_ipv4 (&asbr); | |
176 | ||
68980084 | 177 | asbr_route = ospf_find_asbr_route (ospf, rt_router, &asbr); |
718e3744 | 178 | |
179 | if (asbr_route == NULL) | |
180 | { | |
e40dcce1 | 181 | if (IS_DEBUG_OSPF (lsa, LSA)) |
182 | zlog_debug ("ospf_ase_calculate(): Route to ASBR %s not found", | |
183 | inet_ntoa (asbr.prefix)); | |
718e3744 | 184 | return NULL; |
185 | } | |
186 | ||
187 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) | |
188 | { | |
e40dcce1 | 189 | if (IS_DEBUG_OSPF (lsa, LSA)) |
190 | zlog_debug ("ospf_ase_calculate(): Originating router is not an ASBR"); | |
718e3744 | 191 | return NULL; |
192 | } | |
193 | ||
194 | if (al->e[0].fwd_addr.s_addr != 0) | |
195 | { | |
e40dcce1 | 196 | if (IS_DEBUG_OSPF (lsa, LSA)) |
197 | zlog_debug ("ospf_ase_calculate(): " | |
198 | "Forwarding address is not 0.0.0.0."); | |
718e3744 | 199 | |
68980084 | 200 | if (! ospf_ase_forward_address_check (ospf, al->e[0].fwd_addr)) |
718e3744 | 201 | { |
e40dcce1 | 202 | if (IS_DEBUG_OSPF (lsa, LSA)) |
203 | zlog_debug ("ospf_ase_calculate(): " | |
204 | "Forwarding address is one of our addresses, Ignore."); | |
718e3744 | 205 | return NULL; |
206 | } | |
207 | ||
e40dcce1 | 208 | if (IS_DEBUG_OSPF (lsa, LSA)) |
209 | zlog_debug ("ospf_ase_calculate(): " | |
210 | "Looking up in the Network Routing Table."); | |
718e3744 | 211 | |
212 | /* Looking up the path to the fwd_addr from Network route. */ | |
213 | asbr.family = AF_INET; | |
214 | asbr.prefix = al->e[0].fwd_addr; | |
215 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
216 | ||
217 | rn = route_node_match (rt_network, (struct prefix *) &asbr); | |
218 | ||
219 | if (rn == NULL) | |
220 | { | |
e40dcce1 | 221 | if (IS_DEBUG_OSPF (lsa, LSA)) |
222 | zlog_debug ("ospf_ase_calculate(): " | |
223 | "Couldn't find a route to the forwarding address."); | |
718e3744 | 224 | return NULL; |
225 | } | |
226 | ||
227 | route_unlock_node (rn); | |
228 | ||
229 | if ((asbr_route = rn->info) == NULL) | |
230 | { | |
e40dcce1 | 231 | if (IS_DEBUG_OSPF (lsa, LSA)) |
232 | zlog_debug ("ospf_ase_calculate(): " | |
233 | "Somehow OSPF route to ASBR is lost"); | |
718e3744 | 234 | return NULL; |
235 | } | |
236 | } | |
237 | ||
238 | return asbr_route; | |
239 | } | |
3408afe2 | 240 | #endif |
718e3744 | 241 | |
4dadc291 | 242 | static struct ospf_route * |
d62a17ae | 243 | ospf_ase_calculate_new_route(struct ospf_lsa *lsa, |
d7c0a89a | 244 | struct ospf_route *asbr_route, uint32_t metric) |
718e3744 | 245 | { |
d62a17ae | 246 | struct as_external_lsa *al; |
247 | struct ospf_route *new; | |
248 | ||
249 | al = (struct as_external_lsa *)lsa->data; | |
250 | ||
251 | new = ospf_route_new(); | |
252 | ||
253 | /* Set redistributed type -- does make sense? */ | |
254 | /* new->type = type; */ | |
255 | new->id = al->header.id; | |
256 | new->mask = al->mask; | |
257 | ||
258 | if (!IS_EXTERNAL_METRIC(al->e[0].tos)) { | |
259 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
260 | zlog_debug("Route[External]: type-1 created."); | |
261 | new->path_type = OSPF_PATH_TYPE1_EXTERNAL; | |
262 | new->cost = asbr_route->cost + metric; /* X + Y */ | |
263 | } else { | |
264 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
265 | zlog_debug("Route[External]: type-2 created."); | |
266 | new->path_type = OSPF_PATH_TYPE2_EXTERNAL; | |
267 | new->cost = asbr_route->cost; /* X */ | |
268 | new->u.ext.type2_cost = metric; /* Y */ | |
269 | } | |
718e3744 | 270 | |
d62a17ae | 271 | new->type = OSPF_DESTINATION_NETWORK; |
272 | new->u.ext.origin = lsa; | |
273 | new->u.ext.tag = ntohl(al->e[0].route_tag); | |
274 | new->u.ext.asbr = asbr_route; | |
718e3744 | 275 | |
d62a17ae | 276 | assert(new != asbr_route); |
718e3744 | 277 | |
d62a17ae | 278 | return new; |
718e3744 | 279 | } |
280 | ||
281 | #define OSPF_ASE_CALC_INTERVAL 1 | |
282 | ||
d62a17ae | 283 | int ospf_ase_calculate_route(struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 284 | { |
d7c0a89a | 285 | uint32_t metric; |
d62a17ae | 286 | struct as_external_lsa *al; |
287 | struct ospf_route *asbr_route; | |
288 | struct prefix_ipv4 asbr, p; | |
289 | struct route_node *rn; | |
290 | struct ospf_route *new, * or ; | |
291 | int ret; | |
292 | ||
293 | assert(lsa); | |
294 | al = (struct as_external_lsa *)lsa->data; | |
295 | ||
296 | if (lsa->data->type == OSPF_AS_NSSA_LSA) | |
297 | if (IS_DEBUG_OSPF_NSSA) | |
298 | zlog_debug("ospf_ase_calc(): Processing Type-7"); | |
299 | ||
300 | /* Stay away from any Local Translated Type-7 LSAs */ | |
301 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) { | |
302 | if (IS_DEBUG_OSPF_NSSA) | |
303 | zlog_debug("ospf_ase_calc(): Rejecting Local Xlt'd"); | |
304 | return 0; | |
718e3744 | 305 | } |
718e3744 | 306 | |
d62a17ae | 307 | if (IS_DEBUG_OSPF(lsa, LSA)) |
308 | zlog_debug( | |
309 | "Route[External]: Calculate AS-external-LSA to %s/%d", | |
310 | inet_ntoa(al->header.id), ip_masklen(al->mask)); | |
311 | /* (1) If the cost specified by the LSA is LSInfinity, or if the | |
312 | LSA's LS age is equal to MaxAge, then examine the next LSA. */ | |
313 | if ((metric = GET_METRIC(al->e[0].metric)) >= OSPF_LS_INFINITY) { | |
314 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
315 | zlog_debug( | |
316 | "Route[External]: Metric is OSPF_LS_INFINITY"); | |
317 | return 0; | |
318 | } | |
319 | if (IS_LSA_MAXAGE(lsa)) { | |
320 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
321 | zlog_debug( | |
322 | "Route[External]: AS-external-LSA is MAXAGE"); | |
323 | return 0; | |
718e3744 | 324 | } |
325 | ||
d62a17ae | 326 | /* (2) If the LSA was originated by the calculating router itself, |
327 | examine the next LSA. */ | |
328 | if (IS_LSA_SELF(lsa)) { | |
329 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
330 | zlog_debug( | |
331 | "Route[External]: AS-external-LSA is self originated"); | |
332 | return 0; | |
333 | } | |
718e3744 | 334 | |
d62a17ae | 335 | /* (3) Call the destination described by the LSA N. N's address is |
336 | obtained by masking the LSA's Link State ID with the | |
337 | network/subnet mask contained in the body of the LSA. Look | |
338 | up the routing table entries (potentially one per attached | |
339 | area) for the AS boundary router (ASBR) that originated the | |
340 | LSA. If no entries exist for router ASBR (i.e., ASBR is | |
341 | unreachable), do nothing with this LSA and consider the next | |
342 | in the list. */ | |
343 | ||
344 | asbr.family = AF_INET; | |
345 | asbr.prefix = al->header.adv_router; | |
346 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
347 | apply_mask_ipv4(&asbr); | |
348 | ||
349 | asbr_route = ospf_find_asbr_route(ospf, ospf->new_rtrs, &asbr); | |
350 | if (asbr_route == NULL) { | |
351 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
352 | zlog_debug( | |
353 | "Route[External]: Can't find originating ASBR route"); | |
354 | return 0; | |
355 | } | |
356 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) { | |
357 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
358 | zlog_debug( | |
359 | "Route[External]: Originating router is not an ASBR"); | |
360 | return 0; | |
361 | } | |
718e3744 | 362 | |
d62a17ae | 363 | /* Else, this LSA describes an AS external path to destination |
364 | N. Examine the forwarding address specified in the AS- | |
365 | external-LSA. This indicates the IP address to which | |
366 | packets for the destination should be forwarded. */ | |
367 | ||
368 | if (al->e[0].fwd_addr.s_addr == 0) { | |
369 | /* If the forwarding address is set to 0.0.0.0, packets should | |
370 | be sent to the ASBR itself. Among the multiple routing table | |
371 | entries for the ASBR, select the preferred entry as follows. | |
372 | If RFC1583Compatibility is set to "disabled", prune the set | |
373 | of routing table entries for the ASBR as described in | |
374 | Section 16.4.1. In any case, among the remaining routing | |
375 | table entries, select the routing table entry with the least | |
376 | cost; when there are multiple least cost routing table | |
377 | entries the entry whose associated area has the largest OSPF | |
378 | Area ID (when considered as an unsigned 32-bit integer) is | |
379 | chosen. */ | |
380 | ||
381 | /* asbr_route already contains the requested route */ | |
382 | } else { | |
383 | /* If the forwarding address is non-zero, look up the | |
384 | forwarding address in the routing table.[24] The matching | |
385 | routing table entry must specify an intra-area or inter-area | |
386 | path; if no such path exists, do nothing with the LSA and | |
387 | consider the next in the list. */ | |
388 | if (!ospf_ase_forward_address_check(ospf, al->e[0].fwd_addr)) { | |
389 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
390 | zlog_debug( | |
391 | "Route[External]: Forwarding address is our router " | |
392 | "address"); | |
393 | return 0; | |
394 | } | |
395 | ||
396 | asbr.family = AF_INET; | |
397 | asbr.prefix = al->e[0].fwd_addr; | |
398 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
399 | ||
400 | rn = route_node_match(ospf->new_table, (struct prefix *)&asbr); | |
401 | ||
402 | if (rn == NULL || (asbr_route = rn->info) == NULL) { | |
403 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
404 | zlog_debug( | |
405 | "Route[External]: Can't find route to forwarding " | |
406 | "address"); | |
407 | if (rn) | |
408 | route_unlock_node(rn); | |
409 | return 0; | |
410 | } | |
411 | ||
412 | route_unlock_node(rn); | |
718e3744 | 413 | } |
d62a17ae | 414 | |
415 | /* (4) Let X be the cost specified by the preferred routing table | |
416 | entry for the ASBR/forwarding address, and Y the cost | |
417 | specified in the LSA. X is in terms of the link state | |
418 | metric, and Y is a type 1 or 2 external metric. */ | |
419 | ||
420 | ||
421 | /* (5) Look up the routing table entry for the destination N. If | |
422 | no entry exists for N, install the AS external path to N, | |
423 | with next hop equal to the list of next hops to the | |
424 | forwarding address, and advertising router equal to ASBR. | |
425 | If the external metric type is 1, then the path-type is set | |
426 | to type 1 external and the cost is equal to X+Y. If the | |
427 | external metric type is 2, the path-type is set to type 2 | |
428 | external, the link state component of the route's cost is X, | |
429 | and the type 2 cost is Y. */ | |
430 | new = ospf_ase_calculate_new_route(lsa, asbr_route, metric); | |
431 | ||
432 | /* (6) Compare the AS external path described by the LSA with the | |
433 | existing paths in N's routing table entry, as follows. If | |
434 | the new path is preferred, it replaces the present paths in | |
435 | N's routing table entry. If the new path is of equal | |
436 | preference, it is added to N's routing table entry's list of | |
437 | paths. */ | |
438 | ||
439 | /* Set prefix. */ | |
440 | p.family = AF_INET; | |
441 | p.prefix = al->header.id; | |
442 | p.prefixlen = ip_masklen(al->mask); | |
443 | ||
444 | /* if there is a Intra/Inter area route to the N | |
445 | do not install external route */ | |
446 | if ((rn = route_node_lookup(ospf->new_table, (struct prefix *)&p))) { | |
447 | route_unlock_node(rn); | |
448 | if (rn->info == NULL) | |
449 | zlog_info("Route[External]: rn->info NULL"); | |
450 | if (new) | |
451 | ospf_route_free(new); | |
452 | return 0; | |
718e3744 | 453 | } |
d62a17ae | 454 | /* Find a route to the same dest */ |
455 | /* If there is no route, create new one. */ | |
456 | if ((rn = route_node_lookup(ospf->new_external_route, | |
457 | (struct prefix *)&p))) | |
458 | route_unlock_node(rn); | |
459 | ||
460 | if (!rn || (or = rn->info) == NULL) { | |
461 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
462 | zlog_debug("Route[External]: Adding a new route %s/%d", | |
463 | inet_ntoa(p.prefix), p.prefixlen); | |
464 | ||
465 | ospf_route_add(ospf->new_external_route, &p, new, asbr_route); | |
466 | ||
467 | if (al->e[0].fwd_addr.s_addr) | |
468 | ospf_ase_complete_direct_routes(new, al->e[0].fwd_addr); | |
469 | return 0; | |
470 | } else { | |
471 | /* (a) Intra-area and inter-area paths are always preferred | |
472 | over AS external paths. | |
473 | ||
474 | (b) Type 1 external paths are always preferred over type 2 | |
475 | external paths. When all paths are type 2 external | |
476 | paths, the paths with the smallest advertised type 2 | |
477 | metric are always preferred. */ | |
478 | ret = ospf_route_cmp(ospf, new, or); | |
479 | ||
480 | /* (c) If the new AS external path is still | |
481 | indistinguishable | |
482 | from the current paths in the N's routing table | |
483 | entry, | |
484 | and RFC1583Compatibility is set to "disabled", select | |
485 | the preferred paths based on the intra-AS paths to | |
486 | the | |
487 | ASBR/forwarding addresses, as specified in Section | |
488 | 16.4.1. | |
489 | ||
490 | (d) If the new AS external path is still | |
491 | indistinguishable | |
492 | from the current paths in the N's routing table | |
493 | entry, | |
494 | select the preferred path based on a least cost | |
495 | comparison. Type 1 external paths are compared by | |
496 | looking at the sum of the distance to the forwarding | |
497 | address and the advertised type 1 metric (X+Y). Type | |
498 | 2 | |
499 | external paths advertising equal type 2 metrics are | |
500 | compared by looking at the distance to the forwarding | |
501 | addresses. | |
502 | */ | |
503 | /* New route is better */ | |
504 | if (ret < 0) { | |
505 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
506 | zlog_debug( | |
507 | "Route[External]: New route is better"); | |
508 | ospf_route_subst(rn, new, asbr_route); | |
509 | if (al->e[0].fwd_addr.s_addr) | |
510 | ospf_ase_complete_direct_routes( | |
511 | new, al->e[0].fwd_addr); | |
512 | or = new; | |
513 | new = NULL; | |
514 | } | |
515 | /* Old route is better */ | |
516 | else if (ret > 0) { | |
517 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
518 | zlog_debug( | |
519 | "Route[External]: Old route is better"); | |
520 | /* do nothing */ | |
521 | } | |
522 | /* Routes are equal */ | |
523 | else { | |
524 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
525 | zlog_debug("Route[External]: Routes are equal"); | |
526 | ospf_route_copy_nexthops(or, asbr_route->paths); | |
527 | if (al->e[0].fwd_addr.s_addr) | |
528 | ospf_ase_complete_direct_routes( | |
529 | or, al->e[0].fwd_addr); | |
530 | } | |
718e3744 | 531 | } |
d62a17ae | 532 | /* Make sure setting newly calculated ASBR route.*/ |
533 | or->u.ext.asbr = asbr_route; | |
534 | if (new) | |
535 | ospf_route_free(new); | |
718e3744 | 536 | |
d62a17ae | 537 | lsa->route = or ; |
538 | return 0; | |
718e3744 | 539 | } |
540 | ||
d62a17ae | 541 | static int ospf_ase_route_match_same(struct route_table *rt, |
542 | struct prefix *prefix, | |
543 | struct ospf_route *newor) | |
718e3744 | 544 | { |
d62a17ae | 545 | struct route_node *rn; |
546 | struct ospf_route * or ; | |
547 | struct ospf_path *op; | |
548 | struct ospf_path *newop; | |
549 | struct listnode *n1; | |
550 | struct listnode *n2; | |
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 | case OSPF_PATH_TYPE1_EXTERNAL: | |
567 | if (or->cost != newor->cost) | |
568 | return 0; | |
569 | break; | |
570 | case OSPF_PATH_TYPE2_EXTERNAL: | |
571 | if ((or->cost != newor->cost) | |
572 | || (or->u.ext.type2_cost != newor->u.ext.type2_cost)) | |
573 | return 0; | |
574 | break; | |
575 | default: | |
576 | assert(0); | |
577 | return 0; | |
578 | } | |
579 | ||
580 | if (or->paths->count != newor->paths->count) | |
581 | return 0; | |
582 | ||
583 | /* Check each path. */ | |
584 | for (n1 = listhead(or->paths), n2 = listhead(newor->paths); n1 && n2; | |
585 | n1 = listnextnode(n1), n2 = listnextnode(n2)) { | |
586 | op = listgetdata(n1); | |
587 | newop = listgetdata(n2); | |
588 | ||
589 | if (!IPV4_ADDR_SAME(&op->nexthop, &newop->nexthop)) | |
590 | return 0; | |
591 | if (op->ifindex != newop->ifindex) | |
592 | return 0; | |
593 | } | |
594 | ||
595 | if (or->u.ext.tag != newor->u.ext.tag) | |
596 | return 0; | |
597 | ||
598 | return 1; | |
718e3744 | 599 | } |
600 | ||
b5a8894d CS |
601 | static int ospf_ase_compare_tables(struct ospf *ospf, |
602 | struct route_table *new_external_route, | |
d62a17ae | 603 | struct route_table *old_external_route) |
718e3744 | 604 | { |
d62a17ae | 605 | struct route_node *rn, *new_rn; |
606 | struct ospf_route * or ; | |
607 | ||
608 | /* Remove deleted routes */ | |
609 | for (rn = route_top(old_external_route); rn; rn = route_next(rn)) | |
610 | if ((or = rn->info)) { | |
611 | if (!(new_rn = route_node_lookup(new_external_route, | |
612 | &rn->p))) | |
996c9314 LB |
613 | ospf_zebra_delete( |
614 | ospf, (struct prefix_ipv4 *)&rn->p, or); | |
d62a17ae | 615 | else |
616 | route_unlock_node(new_rn); | |
617 | } | |
618 | ||
619 | ||
620 | /* Install new routes */ | |
621 | for (rn = route_top(new_external_route); rn; rn = route_next(rn)) | |
622 | if ((or = rn->info) != NULL) | |
623 | if (!ospf_ase_route_match_same(old_external_route, | |
624 | &rn->p, or)) | |
996c9314 LB |
625 | ospf_zebra_add( |
626 | ospf, (struct prefix_ipv4 *)&rn->p, or); | |
d62a17ae | 627 | |
628 | return 0; | |
718e3744 | 629 | } |
630 | ||
d62a17ae | 631 | static int ospf_ase_calculate_timer(struct thread *t) |
718e3744 | 632 | { |
d62a17ae | 633 | struct ospf *ospf; |
634 | struct ospf_lsa *lsa; | |
635 | struct route_node *rn; | |
636 | struct listnode *node; | |
637 | struct ospf_area *area; | |
638 | struct timeval start_time, stop_time; | |
639 | ||
640 | ospf = THREAD_ARG(t); | |
641 | ospf->t_ase_calc = NULL; | |
642 | ||
643 | if (ospf->ase_calc) { | |
644 | ospf->ase_calc = 0; | |
645 | ||
646 | monotime(&start_time); | |
647 | ||
648 | /* Calculate external route for each AS-external-LSA */ | |
996c9314 | 649 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) |
044506e7 | 650 | ospf_ase_calculate_route(ospf, lsa); |
d62a17ae | 651 | |
652 | /* This version simple adds to the table all NSSA areas */ | |
653 | if (ospf->anyNSSA) | |
654 | for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) { | |
655 | if (IS_DEBUG_OSPF_NSSA) | |
656 | zlog_debug( | |
657 | "ospf_ase_calculate_timer(): looking at area %s", | |
658 | inet_ntoa(area->area_id)); | |
659 | ||
660 | if (area->external_routing == OSPF_AREA_NSSA) | |
996c9314 | 661 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) |
044506e7 DS |
662 | ospf_ase_calculate_route(ospf, |
663 | lsa); | |
d62a17ae | 664 | } |
665 | /* kevinm: And add the NSSA routes in ospf_top */ | |
996c9314 | 666 | LSDB_LOOP (NSSA_LSDB(ospf), rn, lsa) |
044506e7 | 667 | ospf_ase_calculate_route(ospf, lsa); |
d62a17ae | 668 | |
669 | /* Compare old and new external routing table and install the | |
670 | difference info zebra/kernel */ | |
b5a8894d | 671 | ospf_ase_compare_tables(ospf, ospf->new_external_route, |
d62a17ae | 672 | ospf->old_external_route); |
673 | ||
674 | /* Delete old external routing table */ | |
675 | ospf_route_table_free(ospf->old_external_route); | |
676 | ospf->old_external_route = ospf->new_external_route; | |
677 | ospf->new_external_route = route_table_init(); | |
678 | ||
679 | monotime(&stop_time); | |
680 | ||
05ba78e4 | 681 | if (IS_DEBUG_OSPF_EVENT) |
996c9314 LB |
682 | zlog_info( |
683 | "SPF Processing Time(usecs): External Routes: %lld\n", | |
684 | (stop_time.tv_sec - start_time.tv_sec) | |
685 | * 1000000LL | |
686 | + (stop_time.tv_usec | |
687 | - start_time.tv_usec)); | |
d62a17ae | 688 | } |
689 | return 0; | |
718e3744 | 690 | } |
691 | ||
d62a17ae | 692 | void ospf_ase_calculate_schedule(struct ospf *ospf) |
718e3744 | 693 | { |
d62a17ae | 694 | if (ospf == NULL) |
695 | return; | |
718e3744 | 696 | |
d62a17ae | 697 | ospf->ase_calc = 1; |
718e3744 | 698 | } |
699 | ||
d62a17ae | 700 | void ospf_ase_calculate_timer_add(struct ospf *ospf) |
718e3744 | 701 | { |
d62a17ae | 702 | if (ospf == NULL) |
703 | return; | |
718e3744 | 704 | |
d62a17ae | 705 | thread_add_timer(master, ospf_ase_calculate_timer, ospf, |
706 | OSPF_ASE_CALC_INTERVAL, &ospf->t_ase_calc); | |
718e3744 | 707 | } |
708 | ||
d62a17ae | 709 | void ospf_ase_register_external_lsa(struct ospf_lsa *lsa, struct ospf *top) |
718e3744 | 710 | { |
d62a17ae | 711 | struct route_node *rn; |
712 | struct prefix_ipv4 p; | |
713 | struct list *lst; | |
714 | struct as_external_lsa *al; | |
715 | ||
716 | al = (struct as_external_lsa *)lsa->data; | |
717 | p.family = AF_INET; | |
718 | p.prefix = lsa->data->id; | |
719 | p.prefixlen = ip_masklen(al->mask); | |
720 | apply_mask_ipv4(&p); | |
721 | ||
722 | rn = route_node_get(top->external_lsas, (struct prefix *)&p); | |
723 | if ((lst = rn->info) == NULL) | |
724 | rn->info = lst = list_new(); | |
725 | else | |
726 | route_unlock_node(rn); | |
727 | ||
728 | /* We assume that if LSA is deleted from DB | |
729 | is is also deleted from this RT */ | |
730 | listnode_add(lst, ospf_lsa_lock(lsa)); /* external_lsas lst */ | |
718e3744 | 731 | } |
732 | ||
d62a17ae | 733 | void ospf_ase_unregister_external_lsa(struct ospf_lsa *lsa, struct ospf *top) |
718e3744 | 734 | { |
d62a17ae | 735 | struct route_node *rn; |
736 | struct prefix_ipv4 p; | |
737 | struct list *lst; | |
738 | struct as_external_lsa *al; | |
739 | ||
740 | al = (struct as_external_lsa *)lsa->data; | |
741 | p.family = AF_INET; | |
742 | p.prefix = lsa->data->id; | |
743 | p.prefixlen = ip_masklen(al->mask); | |
744 | apply_mask_ipv4(&p); | |
745 | ||
746 | rn = route_node_lookup(top->external_lsas, (struct prefix *)&p); | |
747 | ||
748 | if (rn) { | |
749 | lst = rn->info; | |
750 | listnode_delete(lst, lsa); | |
751 | ospf_lsa_unlock(&lsa); /* external_lsas list */ | |
752 | route_unlock_node(rn); | |
753 | } | |
718e3744 | 754 | } |
755 | ||
d62a17ae | 756 | void ospf_ase_external_lsas_finish(struct route_table *rt) |
718e3744 | 757 | { |
d62a17ae | 758 | struct route_node *rn; |
759 | struct ospf_lsa *lsa; | |
760 | struct list *lst; | |
761 | struct listnode *node, *nnode; | |
762 | ||
763 | for (rn = route_top(rt); rn; rn = route_next(rn)) | |
764 | if ((lst = rn->info) != NULL) { | |
765 | for (ALL_LIST_ELEMENTS(lst, node, nnode, lsa)) | |
766 | ospf_lsa_unlock(&lsa); /* external_lsas lst */ | |
affe9e99 | 767 | list_delete_and_null(&lst); |
d62a17ae | 768 | } |
769 | ||
770 | route_table_finish(rt); | |
718e3744 | 771 | } |
772 | ||
d62a17ae | 773 | void ospf_ase_incremental_update(struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 774 | { |
d62a17ae | 775 | struct list *lsas; |
776 | struct listnode *node; | |
777 | struct route_node *rn, *rn2; | |
778 | struct prefix_ipv4 p; | |
779 | struct route_table *tmp_old; | |
780 | struct as_external_lsa *al; | |
781 | ||
782 | al = (struct as_external_lsa *)lsa->data; | |
783 | p.family = AF_INET; | |
784 | p.prefix = lsa->data->id; | |
785 | p.prefixlen = ip_masklen(al->mask); | |
786 | apply_mask_ipv4(&p); | |
787 | ||
788 | /* if new_table is NULL, there was no spf calculation, thus | |
789 | incremental update is unneeded */ | |
790 | if (!ospf->new_table) | |
791 | return; | |
792 | ||
793 | /* If there is already an intra-area or inter-area route | |
794 | to the destination, no recalculation is necessary | |
795 | (internal routes take precedence). */ | |
796 | ||
797 | rn = route_node_lookup(ospf->new_table, (struct prefix *)&p); | |
798 | if (rn) { | |
799 | route_unlock_node(rn); | |
800 | if (rn->info) | |
801 | return; | |
802 | } | |
718e3744 | 803 | |
d62a17ae | 804 | rn = route_node_lookup(ospf->external_lsas, (struct prefix *)&p); |
805 | assert(rn); | |
806 | assert(rn->info); | |
807 | lsas = rn->info; | |
808 | route_unlock_node(rn); | |
809 | ||
810 | for (ALL_LIST_ELEMENTS_RO(lsas, node, lsa)) | |
811 | ospf_ase_calculate_route(ospf, lsa); | |
812 | ||
813 | /* prepare temporary old routing table for compare */ | |
814 | tmp_old = route_table_init(); | |
815 | rn = route_node_lookup(ospf->old_external_route, (struct prefix *)&p); | |
816 | if (rn && rn->info) { | |
817 | rn2 = route_node_get(tmp_old, (struct prefix *)&p); | |
818 | rn2->info = rn->info; | |
819 | route_unlock_node(rn); | |
820 | } | |
718e3744 | 821 | |
d62a17ae | 822 | /* install changes to zebra */ |
b5a8894d | 823 | ospf_ase_compare_tables(ospf, ospf->new_external_route, tmp_old); |
d62a17ae | 824 | |
825 | /* update ospf->old_external_route table */ | |
826 | if (rn && rn->info) | |
827 | ospf_route_free((struct ospf_route *)rn->info); | |
828 | ||
829 | rn2 = route_node_lookup(ospf->new_external_route, (struct prefix *)&p); | |
830 | /* if new route exists, install it to ospf->old_external_route */ | |
831 | if (rn2 && rn2->info) { | |
832 | if (!rn) | |
833 | rn = route_node_get(ospf->old_external_route, | |
834 | (struct prefix *)&p); | |
835 | rn->info = rn2->info; | |
836 | } else { | |
837 | /* remove route node from ospf->old_external_route */ | |
838 | if (rn) { | |
839 | rn->info = NULL; | |
840 | route_unlock_node(rn); | |
841 | } | |
718e3744 | 842 | } |
718e3744 | 843 | |
d62a17ae | 844 | if (rn2) { |
845 | /* rn2->info is stored in route node of ospf->old_external_route | |
846 | */ | |
847 | rn2->info = NULL; | |
848 | route_unlock_node(rn2); | |
849 | route_unlock_node(rn2); | |
850 | } | |
718e3744 | 851 | |
d62a17ae | 852 | route_table_finish(tmp_old); |
718e3744 | 853 | } |