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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) { | |
6a154c88 | 80 | list_delete(&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) | |
6a154c88 | 101 | list_delete(&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)) |
3a6290bd | 139 | if (op->nexthop.s_addr == INADDR_ANY) |
d62a17ae | 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)) |
96b663a3 MS |
182 | zlog_debug ("ospf_ase_calculate(): Route to ASBR %pI4 not found", |
183 | &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 | } | |
c258527b | 193 | |
3a6290bd | 194 | if (al->e[0].fwd_addr.s_addr != INADDR_ANY) |
718e3744 | 195 | { |
e40dcce1 | 196 | if (IS_DEBUG_OSPF (lsa, LSA)) |
3efd0893 | 197 | zlog_debug ("ospf_ase_calculate(): 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)) |
3efd0893 | 202 | zlog_debug ("ospf_ase_calculate(): Forwarding address is one of our addresses, Ignore."); |
718e3744 | 203 | return NULL; |
204 | } | |
205 | ||
e40dcce1 | 206 | if (IS_DEBUG_OSPF (lsa, LSA)) |
3efd0893 | 207 | zlog_debug ("ospf_ase_calculate(): Looking up in the Network Routing Table."); |
718e3744 | 208 | |
209 | /* Looking up the path to the fwd_addr from Network route. */ | |
210 | asbr.family = AF_INET; | |
211 | asbr.prefix = al->e[0].fwd_addr; | |
212 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
213 | ||
214 | rn = route_node_match (rt_network, (struct prefix *) &asbr); | |
c258527b | 215 | |
718e3744 | 216 | if (rn == NULL) |
217 | { | |
e40dcce1 | 218 | if (IS_DEBUG_OSPF (lsa, LSA)) |
3efd0893 | 219 | zlog_debug ("ospf_ase_calculate(): Couldn't find a route to the forwarding address."); |
718e3744 | 220 | return NULL; |
221 | } | |
222 | ||
223 | route_unlock_node (rn); | |
224 | ||
225 | if ((asbr_route = rn->info) == NULL) | |
226 | { | |
e40dcce1 | 227 | if (IS_DEBUG_OSPF (lsa, LSA)) |
3efd0893 | 228 | zlog_debug ("ospf_ase_calculate(): Somehow OSPF route to ASBR is lost"); |
718e3744 | 229 | return NULL; |
230 | } | |
231 | } | |
232 | ||
233 | return asbr_route; | |
234 | } | |
3408afe2 | 235 | #endif |
718e3744 | 236 | |
4dadc291 | 237 | static struct ospf_route * |
d62a17ae | 238 | ospf_ase_calculate_new_route(struct ospf_lsa *lsa, |
d7c0a89a | 239 | struct ospf_route *asbr_route, uint32_t metric) |
718e3744 | 240 | { |
d62a17ae | 241 | struct as_external_lsa *al; |
242 | struct ospf_route *new; | |
243 | ||
244 | al = (struct as_external_lsa *)lsa->data; | |
245 | ||
246 | new = ospf_route_new(); | |
247 | ||
248 | /* Set redistributed type -- does make sense? */ | |
249 | /* new->type = type; */ | |
250 | new->id = al->header.id; | |
251 | new->mask = al->mask; | |
252 | ||
253 | if (!IS_EXTERNAL_METRIC(al->e[0].tos)) { | |
254 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
255 | zlog_debug("Route[External]: type-1 created."); | |
256 | new->path_type = OSPF_PATH_TYPE1_EXTERNAL; | |
257 | new->cost = asbr_route->cost + metric; /* X + Y */ | |
258 | } else { | |
259 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
260 | zlog_debug("Route[External]: type-2 created."); | |
261 | new->path_type = OSPF_PATH_TYPE2_EXTERNAL; | |
262 | new->cost = asbr_route->cost; /* X */ | |
263 | new->u.ext.type2_cost = metric; /* Y */ | |
264 | } | |
718e3744 | 265 | |
d62a17ae | 266 | new->type = OSPF_DESTINATION_NETWORK; |
267 | new->u.ext.origin = lsa; | |
268 | new->u.ext.tag = ntohl(al->e[0].route_tag); | |
269 | new->u.ext.asbr = asbr_route; | |
718e3744 | 270 | |
d62a17ae | 271 | assert(new != asbr_route); |
718e3744 | 272 | |
d62a17ae | 273 | return new; |
718e3744 | 274 | } |
275 | ||
276 | #define OSPF_ASE_CALC_INTERVAL 1 | |
277 | ||
d62a17ae | 278 | int ospf_ase_calculate_route(struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 279 | { |
d7c0a89a | 280 | uint32_t metric; |
d62a17ae | 281 | struct as_external_lsa *al; |
282 | struct ospf_route *asbr_route; | |
283 | struct prefix_ipv4 asbr, p; | |
284 | struct route_node *rn; | |
285 | struct ospf_route *new, * or ; | |
286 | int ret; | |
287 | ||
288 | assert(lsa); | |
289 | al = (struct as_external_lsa *)lsa->data; | |
290 | ||
291 | if (lsa->data->type == OSPF_AS_NSSA_LSA) | |
292 | if (IS_DEBUG_OSPF_NSSA) | |
293 | zlog_debug("ospf_ase_calc(): Processing Type-7"); | |
294 | ||
295 | /* Stay away from any Local Translated Type-7 LSAs */ | |
296 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) { | |
297 | if (IS_DEBUG_OSPF_NSSA) | |
298 | zlog_debug("ospf_ase_calc(): Rejecting Local Xlt'd"); | |
299 | return 0; | |
718e3744 | 300 | } |
718e3744 | 301 | |
96065dc3 | 302 | if (IS_DEBUG_OSPF(lsa, LSA)) { |
d62a17ae | 303 | zlog_debug( |
96b663a3 MS |
304 | "Route[External]: Calculate AS-external-LSA to %pI4/%d adv_router %pI4", |
305 | &al->header.id, ip_masklen(al->mask), | |
306 | &al->header.adv_router); | |
96065dc3 CS |
307 | } |
308 | ||
d62a17ae | 309 | /* (1) If the cost specified by the LSA is LSInfinity, or if the |
310 | LSA's LS age is equal to MaxAge, then examine the next LSA. */ | |
311 | if ((metric = GET_METRIC(al->e[0].metric)) >= OSPF_LS_INFINITY) { | |
312 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
313 | zlog_debug( | |
314 | "Route[External]: Metric is OSPF_LS_INFINITY"); | |
315 | return 0; | |
316 | } | |
317 | if (IS_LSA_MAXAGE(lsa)) { | |
318 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
319 | zlog_debug( | |
320 | "Route[External]: AS-external-LSA is MAXAGE"); | |
321 | return 0; | |
718e3744 | 322 | } |
323 | ||
d62a17ae | 324 | /* (2) If the LSA was originated by the calculating router itself, |
325 | examine the next LSA. */ | |
326 | if (IS_LSA_SELF(lsa)) { | |
327 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
328 | zlog_debug( | |
329 | "Route[External]: AS-external-LSA is self originated"); | |
330 | return 0; | |
331 | } | |
718e3744 | 332 | |
d62a17ae | 333 | /* (3) Call the destination described by the LSA N. N's address is |
334 | obtained by masking the LSA's Link State ID with the | |
335 | network/subnet mask contained in the body of the LSA. Look | |
336 | up the routing table entries (potentially one per attached | |
337 | area) for the AS boundary router (ASBR) that originated the | |
338 | LSA. If no entries exist for router ASBR (i.e., ASBR is | |
339 | unreachable), do nothing with this LSA and consider the next | |
340 | in the list. */ | |
341 | ||
342 | asbr.family = AF_INET; | |
343 | asbr.prefix = al->header.adv_router; | |
344 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
345 | apply_mask_ipv4(&asbr); | |
346 | ||
347 | asbr_route = ospf_find_asbr_route(ospf, ospf->new_rtrs, &asbr); | |
348 | if (asbr_route == NULL) { | |
349 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
350 | zlog_debug( | |
351 | "Route[External]: Can't find originating ASBR route"); | |
352 | return 0; | |
353 | } | |
354 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) { | |
355 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
356 | zlog_debug( | |
357 | "Route[External]: Originating router is not an ASBR"); | |
358 | return 0; | |
359 | } | |
718e3744 | 360 | |
d62a17ae | 361 | /* Else, this LSA describes an AS external path to destination |
362 | N. Examine the forwarding address specified in the AS- | |
363 | external-LSA. This indicates the IP address to which | |
364 | packets for the destination should be forwarded. */ | |
365 | ||
975a328e | 366 | if (al->e[0].fwd_addr.s_addr == INADDR_ANY) { |
d62a17ae | 367 | /* If the forwarding address is set to 0.0.0.0, packets should |
368 | be sent to the ASBR itself. Among the multiple routing table | |
369 | entries for the ASBR, select the preferred entry as follows. | |
370 | If RFC1583Compatibility is set to "disabled", prune the set | |
371 | of routing table entries for the ASBR as described in | |
372 | Section 16.4.1. In any case, among the remaining routing | |
373 | table entries, select the routing table entry with the least | |
374 | cost; when there are multiple least cost routing table | |
375 | entries the entry whose associated area has the largest OSPF | |
376 | Area ID (when considered as an unsigned 32-bit integer) is | |
377 | chosen. */ | |
378 | ||
379 | /* asbr_route already contains the requested route */ | |
380 | } else { | |
381 | /* If the forwarding address is non-zero, look up the | |
382 | forwarding address in the routing table.[24] The matching | |
383 | routing table entry must specify an intra-area or inter-area | |
384 | path; if no such path exists, do nothing with the LSA and | |
385 | consider the next in the list. */ | |
386 | if (!ospf_ase_forward_address_check(ospf, al->e[0].fwd_addr)) { | |
387 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
388 | zlog_debug( | |
3efd0893 | 389 | "Route[External]: Forwarding address is our router address"); |
d62a17ae | 390 | return 0; |
391 | } | |
392 | ||
393 | asbr.family = AF_INET; | |
394 | asbr.prefix = al->e[0].fwd_addr; | |
395 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
396 | ||
397 | rn = route_node_match(ospf->new_table, (struct prefix *)&asbr); | |
398 | ||
399 | if (rn == NULL || (asbr_route = rn->info) == NULL) { | |
400 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
401 | zlog_debug( | |
3efd0893 | 402 | "Route[External]: Can't find route to forwarding address"); |
d62a17ae | 403 | if (rn) |
404 | route_unlock_node(rn); | |
405 | return 0; | |
406 | } | |
407 | ||
408 | route_unlock_node(rn); | |
718e3744 | 409 | } |
d62a17ae | 410 | |
411 | /* (4) Let X be the cost specified by the preferred routing table | |
412 | entry for the ASBR/forwarding address, and Y the cost | |
413 | specified in the LSA. X is in terms of the link state | |
414 | metric, and Y is a type 1 or 2 external metric. */ | |
415 | ||
416 | ||
417 | /* (5) Look up the routing table entry for the destination N. If | |
418 | no entry exists for N, install the AS external path to N, | |
419 | with next hop equal to the list of next hops to the | |
420 | forwarding address, and advertising router equal to ASBR. | |
421 | If the external metric type is 1, then the path-type is set | |
422 | to type 1 external and the cost is equal to X+Y. If the | |
423 | external metric type is 2, the path-type is set to type 2 | |
424 | external, the link state component of the route's cost is X, | |
425 | and the type 2 cost is Y. */ | |
426 | new = ospf_ase_calculate_new_route(lsa, asbr_route, metric); | |
427 | ||
428 | /* (6) Compare the AS external path described by the LSA with the | |
429 | existing paths in N's routing table entry, as follows. If | |
430 | the new path is preferred, it replaces the present paths in | |
431 | N's routing table entry. If the new path is of equal | |
432 | preference, it is added to N's routing table entry's list of | |
433 | paths. */ | |
434 | ||
435 | /* Set prefix. */ | |
436 | p.family = AF_INET; | |
437 | p.prefix = al->header.id; | |
438 | p.prefixlen = ip_masklen(al->mask); | |
439 | ||
440 | /* if there is a Intra/Inter area route to the N | |
441 | do not install external route */ | |
442 | if ((rn = route_node_lookup(ospf->new_table, (struct prefix *)&p))) { | |
443 | route_unlock_node(rn); | |
444 | if (rn->info == NULL) | |
445 | zlog_info("Route[External]: rn->info NULL"); | |
446 | if (new) | |
447 | ospf_route_free(new); | |
448 | return 0; | |
718e3744 | 449 | } |
d62a17ae | 450 | /* Find a route to the same dest */ |
451 | /* If there is no route, create new one. */ | |
452 | if ((rn = route_node_lookup(ospf->new_external_route, | |
453 | (struct prefix *)&p))) | |
454 | route_unlock_node(rn); | |
455 | ||
456 | if (!rn || (or = rn->info) == NULL) { | |
457 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
96b663a3 MS |
458 | zlog_debug("Route[External]: Adding a new route %pFX with paths %u", |
459 | &p, listcount(asbr_route->paths)); | |
d62a17ae | 460 | |
461 | ospf_route_add(ospf->new_external_route, &p, new, asbr_route); | |
462 | ||
975a328e | 463 | if (al->e[0].fwd_addr.s_addr != INADDR_ANY) |
d62a17ae | 464 | ospf_ase_complete_direct_routes(new, al->e[0].fwd_addr); |
465 | return 0; | |
466 | } else { | |
467 | /* (a) Intra-area and inter-area paths are always preferred | |
468 | over AS external paths. | |
469 | ||
470 | (b) Type 1 external paths are always preferred over type 2 | |
471 | external paths. When all paths are type 2 external | |
472 | paths, the paths with the smallest advertised type 2 | |
473 | metric are always preferred. */ | |
474 | ret = ospf_route_cmp(ospf, new, or); | |
475 | ||
476 | /* (c) If the new AS external path is still | |
477 | indistinguishable | |
478 | from the current paths in the N's routing table | |
479 | entry, | |
480 | and RFC1583Compatibility is set to "disabled", select | |
481 | the preferred paths based on the intra-AS paths to | |
482 | the | |
483 | ASBR/forwarding addresses, as specified in Section | |
484 | 16.4.1. | |
485 | ||
486 | (d) If the new AS external path is still | |
487 | indistinguishable | |
488 | from the current paths in the N's routing table | |
489 | entry, | |
490 | select the preferred path based on a least cost | |
491 | comparison. Type 1 external paths are compared by | |
492 | looking at the sum of the distance to the forwarding | |
493 | address and the advertised type 1 metric (X+Y). Type | |
494 | 2 | |
495 | external paths advertising equal type 2 metrics are | |
496 | compared by looking at the distance to the forwarding | |
497 | addresses. | |
498 | */ | |
499 | /* New route is better */ | |
500 | if (ret < 0) { | |
501 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
502 | zlog_debug( | |
503 | "Route[External]: New route is better"); | |
504 | ospf_route_subst(rn, new, asbr_route); | |
975a328e | 505 | if (al->e[0].fwd_addr.s_addr != INADDR_ANY) |
d62a17ae | 506 | ospf_ase_complete_direct_routes( |
507 | new, al->e[0].fwd_addr); | |
508 | or = new; | |
509 | new = NULL; | |
510 | } | |
511 | /* Old route is better */ | |
512 | else if (ret > 0) { | |
513 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
514 | zlog_debug( | |
515 | "Route[External]: Old route is better"); | |
516 | /* do nothing */ | |
517 | } | |
518 | /* Routes are equal */ | |
519 | else { | |
520 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
521 | zlog_debug("Route[External]: Routes are equal"); | |
522 | ospf_route_copy_nexthops(or, asbr_route->paths); | |
975a328e | 523 | if (al->e[0].fwd_addr.s_addr != INADDR_ANY) |
d62a17ae | 524 | ospf_ase_complete_direct_routes( |
525 | or, al->e[0].fwd_addr); | |
526 | } | |
718e3744 | 527 | } |
d62a17ae | 528 | /* Make sure setting newly calculated ASBR route.*/ |
529 | or->u.ext.asbr = asbr_route; | |
530 | if (new) | |
531 | ospf_route_free(new); | |
718e3744 | 532 | |
d62a17ae | 533 | lsa->route = or ; |
534 | return 0; | |
718e3744 | 535 | } |
536 | ||
d62a17ae | 537 | static int ospf_ase_route_match_same(struct route_table *rt, |
538 | struct prefix *prefix, | |
539 | struct ospf_route *newor) | |
718e3744 | 540 | { |
d62a17ae | 541 | struct route_node *rn; |
2ffc213b | 542 | struct ospf_route *or; |
d62a17ae | 543 | struct ospf_path *op; |
544 | struct ospf_path *newop; | |
545 | struct listnode *n1; | |
546 | struct listnode *n2; | |
547 | ||
548 | if (!rt || !prefix) | |
549 | return 0; | |
550 | ||
551 | rn = route_node_lookup(rt, prefix); | |
552 | if (!rn) | |
553 | return 0; | |
554 | ||
555 | route_unlock_node(rn); | |
556 | ||
557 | or = rn->info; | |
2ffc213b A |
558 | |
559 | assert(or); | |
560 | ||
d62a17ae | 561 | if (or->path_type != newor->path_type) |
562 | return 0; | |
563 | ||
564 | switch (or->path_type) { | |
565 | case OSPF_PATH_TYPE1_EXTERNAL: | |
566 | if (or->cost != newor->cost) | |
567 | return 0; | |
568 | break; | |
569 | case OSPF_PATH_TYPE2_EXTERNAL: | |
570 | if ((or->cost != newor->cost) | |
571 | || (or->u.ext.type2_cost != newor->u.ext.type2_cost)) | |
572 | return 0; | |
573 | break; | |
574 | default: | |
575 | assert(0); | |
576 | return 0; | |
577 | } | |
578 | ||
2ffc213b A |
579 | assert(or->paths); |
580 | ||
d62a17ae | 581 | if (or->paths->count != newor->paths->count) |
582 | return 0; | |
583 | ||
584 | /* Check each path. */ | |
585 | for (n1 = listhead(or->paths), n2 = listhead(newor->paths); n1 && n2; | |
39050c7e | 586 | n1 = listnextnode_unchecked(n1), n2 = listnextnode_unchecked(n2)) { |
d62a17ae | 587 | op = listgetdata(n1); |
588 | newop = listgetdata(n2); | |
589 | ||
590 | if (!IPV4_ADDR_SAME(&op->nexthop, &newop->nexthop)) | |
591 | return 0; | |
592 | if (op->ifindex != newop->ifindex) | |
593 | return 0; | |
594 | } | |
595 | ||
596 | if (or->u.ext.tag != newor->u.ext.tag) | |
597 | return 0; | |
598 | ||
599 | return 1; | |
718e3744 | 600 | } |
601 | ||
b5a8894d CS |
602 | static int ospf_ase_compare_tables(struct ospf *ospf, |
603 | struct route_table *new_external_route, | |
d62a17ae | 604 | struct route_table *old_external_route) |
718e3744 | 605 | { |
d62a17ae | 606 | struct route_node *rn, *new_rn; |
607 | struct ospf_route * or ; | |
608 | ||
609 | /* Remove deleted routes */ | |
610 | for (rn = route_top(old_external_route); rn; rn = route_next(rn)) | |
611 | if ((or = rn->info)) { | |
612 | if (!(new_rn = route_node_lookup(new_external_route, | |
613 | &rn->p))) | |
996c9314 LB |
614 | ospf_zebra_delete( |
615 | ospf, (struct prefix_ipv4 *)&rn->p, or); | |
d62a17ae | 616 | else |
617 | route_unlock_node(new_rn); | |
618 | } | |
619 | ||
620 | ||
621 | /* Install new routes */ | |
622 | for (rn = route_top(new_external_route); rn; rn = route_next(rn)) | |
623 | if ((or = rn->info) != NULL) | |
624 | if (!ospf_ase_route_match_same(old_external_route, | |
625 | &rn->p, or)) | |
996c9314 LB |
626 | ospf_zebra_add( |
627 | ospf, (struct prefix_ipv4 *)&rn->p, or); | |
d62a17ae | 628 | |
629 | return 0; | |
718e3744 | 630 | } |
631 | ||
d62a17ae | 632 | static int ospf_ase_calculate_timer(struct thread *t) |
718e3744 | 633 | { |
d62a17ae | 634 | struct ospf *ospf; |
635 | struct ospf_lsa *lsa; | |
636 | struct route_node *rn; | |
637 | struct listnode *node; | |
638 | struct ospf_area *area; | |
639 | struct timeval start_time, stop_time; | |
640 | ||
641 | ospf = THREAD_ARG(t); | |
642 | ospf->t_ase_calc = NULL; | |
643 | ||
644 | if (ospf->ase_calc) { | |
645 | ospf->ase_calc = 0; | |
646 | ||
647 | monotime(&start_time); | |
648 | ||
649 | /* Calculate external route for each AS-external-LSA */ | |
996c9314 | 650 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) |
044506e7 | 651 | ospf_ase_calculate_route(ospf, lsa); |
d62a17ae | 652 | |
653 | /* This version simple adds to the table all NSSA areas */ | |
654 | if (ospf->anyNSSA) | |
655 | for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) { | |
656 | if (IS_DEBUG_OSPF_NSSA) | |
657 | zlog_debug( | |
96b663a3 MS |
658 | "ospf_ase_calculate_timer(): looking at area %pI4", |
659 | &area->area_id); | |
d62a17ae | 660 | |
661 | if (area->external_routing == OSPF_AREA_NSSA) | |
996c9314 | 662 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) |
044506e7 DS |
663 | ospf_ase_calculate_route(ospf, |
664 | lsa); | |
d62a17ae | 665 | } |
666 | /* kevinm: And add the NSSA routes in ospf_top */ | |
996c9314 | 667 | LSDB_LOOP (NSSA_LSDB(ospf), rn, lsa) |
044506e7 | 668 | ospf_ase_calculate_route(ospf, lsa); |
d62a17ae | 669 | |
670 | /* Compare old and new external routing table and install the | |
671 | difference info zebra/kernel */ | |
b5a8894d | 672 | ospf_ase_compare_tables(ospf, ospf->new_external_route, |
d62a17ae | 673 | ospf->old_external_route); |
674 | ||
675 | /* Delete old external routing table */ | |
676 | ospf_route_table_free(ospf->old_external_route); | |
677 | ospf->old_external_route = ospf->new_external_route; | |
678 | ospf->new_external_route = route_table_init(); | |
679 | ||
680 | monotime(&stop_time); | |
681 | ||
05ba78e4 | 682 | if (IS_DEBUG_OSPF_EVENT) |
996c9314 | 683 | zlog_info( |
63efca0e | 684 | "SPF Processing Time(usecs): External Routes: %lld", |
996c9314 LB |
685 | (stop_time.tv_sec - start_time.tv_sec) |
686 | * 1000000LL | |
687 | + (stop_time.tv_usec | |
688 | - start_time.tv_usec)); | |
d62a17ae | 689 | } |
690 | return 0; | |
718e3744 | 691 | } |
692 | ||
d62a17ae | 693 | void ospf_ase_calculate_schedule(struct ospf *ospf) |
718e3744 | 694 | { |
d62a17ae | 695 | if (ospf == NULL) |
696 | return; | |
718e3744 | 697 | |
d62a17ae | 698 | ospf->ase_calc = 1; |
718e3744 | 699 | } |
700 | ||
d62a17ae | 701 | void ospf_ase_calculate_timer_add(struct ospf *ospf) |
718e3744 | 702 | { |
d62a17ae | 703 | if (ospf == NULL) |
704 | return; | |
718e3744 | 705 | |
d62a17ae | 706 | thread_add_timer(master, ospf_ase_calculate_timer, ospf, |
707 | OSPF_ASE_CALC_INTERVAL, &ospf->t_ase_calc); | |
718e3744 | 708 | } |
709 | ||
d62a17ae | 710 | void ospf_ase_register_external_lsa(struct ospf_lsa *lsa, struct ospf *top) |
718e3744 | 711 | { |
d62a17ae | 712 | struct route_node *rn; |
713 | struct prefix_ipv4 p; | |
714 | struct list *lst; | |
715 | struct as_external_lsa *al; | |
716 | ||
717 | al = (struct as_external_lsa *)lsa->data; | |
718 | p.family = AF_INET; | |
719 | p.prefix = lsa->data->id; | |
720 | p.prefixlen = ip_masklen(al->mask); | |
721 | apply_mask_ipv4(&p); | |
722 | ||
723 | rn = route_node_get(top->external_lsas, (struct prefix *)&p); | |
724 | if ((lst = rn->info) == NULL) | |
725 | rn->info = lst = list_new(); | |
726 | else | |
727 | route_unlock_node(rn); | |
728 | ||
729 | /* We assume that if LSA is deleted from DB | |
730 | is is also deleted from this RT */ | |
731 | listnode_add(lst, ospf_lsa_lock(lsa)); /* external_lsas lst */ | |
718e3744 | 732 | } |
733 | ||
d62a17ae | 734 | void ospf_ase_unregister_external_lsa(struct ospf_lsa *lsa, struct ospf *top) |
718e3744 | 735 | { |
d62a17ae | 736 | struct route_node *rn; |
737 | struct prefix_ipv4 p; | |
738 | struct list *lst; | |
739 | struct as_external_lsa *al; | |
740 | ||
741 | al = (struct as_external_lsa *)lsa->data; | |
742 | p.family = AF_INET; | |
743 | p.prefix = lsa->data->id; | |
744 | p.prefixlen = ip_masklen(al->mask); | |
745 | apply_mask_ipv4(&p); | |
746 | ||
747 | rn = route_node_lookup(top->external_lsas, (struct prefix *)&p); | |
748 | ||
749 | if (rn) { | |
750 | lst = rn->info; | |
87627de6 MR |
751 | struct listnode *node = listnode_lookup(lst, lsa); |
752 | /* Unlock lsa only if node is present in the list */ | |
753 | if (node) { | |
754 | listnode_delete(lst, lsa); | |
755 | ospf_lsa_unlock(&lsa); /* external_lsas list */ | |
756 | } | |
f91ce319 | 757 | |
d62a17ae | 758 | route_unlock_node(rn); |
759 | } | |
718e3744 | 760 | } |
761 | ||
d62a17ae | 762 | void ospf_ase_external_lsas_finish(struct route_table *rt) |
718e3744 | 763 | { |
d62a17ae | 764 | struct route_node *rn; |
765 | struct ospf_lsa *lsa; | |
766 | struct list *lst; | |
767 | struct listnode *node, *nnode; | |
768 | ||
769 | for (rn = route_top(rt); rn; rn = route_next(rn)) | |
770 | if ((lst = rn->info) != NULL) { | |
771 | for (ALL_LIST_ELEMENTS(lst, node, nnode, lsa)) | |
772 | ospf_lsa_unlock(&lsa); /* external_lsas lst */ | |
6a154c88 | 773 | list_delete(&lst); |
d62a17ae | 774 | } |
775 | ||
776 | route_table_finish(rt); | |
718e3744 | 777 | } |
778 | ||
d62a17ae | 779 | void ospf_ase_incremental_update(struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 780 | { |
d62a17ae | 781 | struct list *lsas; |
782 | struct listnode *node; | |
783 | struct route_node *rn, *rn2; | |
784 | struct prefix_ipv4 p; | |
785 | struct route_table *tmp_old; | |
786 | struct as_external_lsa *al; | |
787 | ||
788 | al = (struct as_external_lsa *)lsa->data; | |
789 | p.family = AF_INET; | |
790 | p.prefix = lsa->data->id; | |
791 | p.prefixlen = ip_masklen(al->mask); | |
792 | apply_mask_ipv4(&p); | |
793 | ||
794 | /* if new_table is NULL, there was no spf calculation, thus | |
795 | incremental update is unneeded */ | |
796 | if (!ospf->new_table) | |
797 | return; | |
798 | ||
799 | /* If there is already an intra-area or inter-area route | |
800 | to the destination, no recalculation is necessary | |
801 | (internal routes take precedence). */ | |
802 | ||
803 | rn = route_node_lookup(ospf->new_table, (struct prefix *)&p); | |
804 | if (rn) { | |
805 | route_unlock_node(rn); | |
806 | if (rn->info) | |
807 | return; | |
808 | } | |
718e3744 | 809 | |
d62a17ae | 810 | rn = route_node_lookup(ospf->external_lsas, (struct prefix *)&p); |
811 | assert(rn); | |
812 | assert(rn->info); | |
813 | lsas = rn->info; | |
814 | route_unlock_node(rn); | |
815 | ||
816 | for (ALL_LIST_ELEMENTS_RO(lsas, node, lsa)) | |
817 | ospf_ase_calculate_route(ospf, lsa); | |
818 | ||
819 | /* prepare temporary old routing table for compare */ | |
820 | tmp_old = route_table_init(); | |
821 | rn = route_node_lookup(ospf->old_external_route, (struct prefix *)&p); | |
822 | if (rn && rn->info) { | |
823 | rn2 = route_node_get(tmp_old, (struct prefix *)&p); | |
824 | rn2->info = rn->info; | |
825 | route_unlock_node(rn); | |
826 | } | |
718e3744 | 827 | |
d62a17ae | 828 | /* install changes to zebra */ |
b5a8894d | 829 | ospf_ase_compare_tables(ospf, ospf->new_external_route, tmp_old); |
d62a17ae | 830 | |
831 | /* update ospf->old_external_route table */ | |
832 | if (rn && rn->info) | |
833 | ospf_route_free((struct ospf_route *)rn->info); | |
834 | ||
835 | rn2 = route_node_lookup(ospf->new_external_route, (struct prefix *)&p); | |
836 | /* if new route exists, install it to ospf->old_external_route */ | |
837 | if (rn2 && rn2->info) { | |
838 | if (!rn) | |
839 | rn = route_node_get(ospf->old_external_route, | |
840 | (struct prefix *)&p); | |
841 | rn->info = rn2->info; | |
842 | } else { | |
843 | /* remove route node from ospf->old_external_route */ | |
844 | if (rn) { | |
845 | rn->info = NULL; | |
846 | route_unlock_node(rn); | |
847 | } | |
718e3744 | 848 | } |
718e3744 | 849 | |
d62a17ae | 850 | if (rn2) { |
851 | /* rn2->info is stored in route node of ospf->old_external_route | |
852 | */ | |
853 | rn2->info = NULL; | |
854 | route_unlock_node(rn2); | |
855 | route_unlock_node(rn2); | |
856 | } | |
718e3744 | 857 | |
d62a17ae | 858 | route_table_finish(tmp_old); |
718e3744 | 859 | } |