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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
718e3744 | 2 | /* |
3 | * OSPF AS external route calculation. | |
4 | * Copyright (C) 1999, 2000 Alex Zinin, Toshiaki Takada | |
718e3744 | 5 | */ |
6 | ||
7 | #include <zebra.h> | |
8 | ||
24a58196 | 9 | #include "frrevent.h" |
718e3744 | 10 | #include "memory.h" |
11 | #include "hash.h" | |
12 | #include "linklist.h" | |
13 | #include "prefix.h" | |
14 | #include "if.h" | |
15 | #include "table.h" | |
16 | #include "vty.h" | |
17 | #include "log.h" | |
18 | ||
19 | #include "ospfd/ospfd.h" | |
20 | #include "ospfd/ospf_interface.h" | |
21 | #include "ospfd/ospf_ism.h" | |
22 | #include "ospfd/ospf_asbr.h" | |
23 | #include "ospfd/ospf_lsa.h" | |
24 | #include "ospfd/ospf_lsdb.h" | |
25 | #include "ospfd/ospf_neighbor.h" | |
26 | #include "ospfd/ospf_nsm.h" | |
27 | #include "ospfd/ospf_spf.h" | |
28 | #include "ospfd/ospf_route.h" | |
29 | #include "ospfd/ospf_ase.h" | |
30 | #include "ospfd/ospf_zebra.h" | |
31 | #include "ospfd/ospf_dump.h" | |
32 | ||
d62a17ae | 33 | struct ospf_route *ospf_find_asbr_route(struct ospf *ospf, |
34 | struct route_table *rtrs, | |
35 | struct prefix_ipv4 *asbr) | |
718e3744 | 36 | { |
d62a17ae | 37 | struct route_node *rn; |
38 | struct ospf_route * or, *best = NULL; | |
39 | struct listnode *node; | |
40 | struct list *chosen; | |
41 | ||
42 | /* Sanity check. */ | |
43 | if (rtrs == NULL) | |
44 | return NULL; | |
45 | ||
46 | rn = route_node_lookup(rtrs, (struct prefix *)asbr); | |
47 | if (!rn) | |
48 | return NULL; | |
49 | ||
50 | route_unlock_node(rn); | |
51 | ||
52 | chosen = list_new(); | |
53 | ||
54 | /* First try to find intra-area non-bb paths. */ | |
55 | if (!CHECK_FLAG(ospf->config, OSPF_RFC1583_COMPATIBLE)) | |
56 | for (ALL_LIST_ELEMENTS_RO((struct list *)rn->info, node, or)) | |
57 | if (or->cost < OSPF_LS_INFINITY) | |
58 | if (!OSPF_IS_AREA_ID_BACKBONE(or->u.std.area_id) | |
59 | && | |
60 | or->path_type == OSPF_PATH_INTRA_AREA) | |
61 | listnode_add(chosen, or); | |
62 | ||
63 | /* If none is found -- look through all. */ | |
64 | if (listcount(chosen) == 0) { | |
6a154c88 | 65 | list_delete(&chosen); |
d62a17ae | 66 | chosen = rn->info; |
67 | } | |
718e3744 | 68 | |
d62a17ae | 69 | /* Now find the route with least cost. */ |
70 | for (ALL_LIST_ELEMENTS_RO(chosen, node, or)) | |
71 | if (or->cost < OSPF_LS_INFINITY) { | |
72 | if (best == NULL) | |
73 | best = or ; | |
74 | else if (best->cost > or->cost) | |
75 | best = or ; | |
76 | else if (best->cost == | |
77 | or->cost | |
78 | && IPV4_ADDR_CMP( | |
79 | &best->u.std.area_id, | |
80 | & or->u.std.area_id) | |
81 | < 0) | |
82 | best = or ; | |
83 | } | |
84 | ||
85 | if (chosen != rn->info) | |
6a154c88 | 86 | list_delete(&chosen); |
d62a17ae | 87 | |
88 | return best; | |
718e3744 | 89 | } |
90 | ||
d62a17ae | 91 | struct ospf_route *ospf_find_asbr_route_through_area(struct route_table *rtrs, |
92 | struct prefix_ipv4 *asbr, | |
93 | struct ospf_area *area) | |
718e3744 | 94 | { |
d62a17ae | 95 | struct route_node *rn; |
718e3744 | 96 | |
d62a17ae | 97 | /* Sanity check. */ |
98 | if (rtrs == NULL) | |
99 | return NULL; | |
718e3744 | 100 | |
d62a17ae | 101 | rn = route_node_lookup(rtrs, (struct prefix *)asbr); |
718e3744 | 102 | |
d62a17ae | 103 | if (rn) { |
104 | struct listnode *node; | |
105 | struct ospf_route * or ; | |
718e3744 | 106 | |
d62a17ae | 107 | route_unlock_node(rn); |
108 | ||
109 | for (ALL_LIST_ELEMENTS_RO((struct list *)rn->info, node, or)) | |
110 | if (IPV4_ADDR_SAME(& or->u.std.area_id, &area->area_id)) | |
111 | return or ; | |
112 | } | |
718e3744 | 113 | |
d62a17ae | 114 | return NULL; |
718e3744 | 115 | } |
116 | ||
d62a17ae | 117 | static void ospf_ase_complete_direct_routes(struct ospf_route *ro, |
118 | struct in_addr nexthop) | |
718e3744 | 119 | { |
d62a17ae | 120 | struct listnode *node; |
121 | struct ospf_path *op; | |
718e3744 | 122 | |
d62a17ae | 123 | for (ALL_LIST_ELEMENTS_RO(ro->paths, node, op)) |
3a6290bd | 124 | if (op->nexthop.s_addr == INADDR_ANY) |
d62a17ae | 125 | op->nexthop.s_addr = nexthop.s_addr; |
718e3744 | 126 | } |
127 | ||
d62a17ae | 128 | static int ospf_ase_forward_address_check(struct ospf *ospf, |
129 | struct in_addr fwd_addr) | |
718e3744 | 130 | { |
d62a17ae | 131 | struct listnode *ifn; |
132 | struct ospf_interface *oi; | |
133 | ||
134 | for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, ifn, oi)) | |
135 | if (if_is_operative(oi->ifp)) | |
136 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
137 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, | |
138 | &fwd_addr)) | |
139 | return 0; | |
140 | ||
141 | return 1; | |
718e3744 | 142 | } |
143 | ||
4dadc291 | 144 | static struct ospf_route * |
d62a17ae | 145 | ospf_ase_calculate_new_route(struct ospf_lsa *lsa, |
d7c0a89a | 146 | struct ospf_route *asbr_route, uint32_t metric) |
718e3744 | 147 | { |
d62a17ae | 148 | struct as_external_lsa *al; |
149 | struct ospf_route *new; | |
150 | ||
151 | al = (struct as_external_lsa *)lsa->data; | |
152 | ||
153 | new = ospf_route_new(); | |
154 | ||
155 | /* Set redistributed type -- does make sense? */ | |
156 | /* new->type = type; */ | |
157 | new->id = al->header.id; | |
158 | new->mask = al->mask; | |
159 | ||
160 | if (!IS_EXTERNAL_METRIC(al->e[0].tos)) { | |
161 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
6af89f8f JAG |
162 | zlog_debug( |
163 | "Route[External]: type-1 created, asbr cost:%d metric:%d.", | |
164 | asbr_route->cost, metric); | |
d62a17ae | 165 | new->path_type = OSPF_PATH_TYPE1_EXTERNAL; |
166 | new->cost = asbr_route->cost + metric; /* X + Y */ | |
167 | } else { | |
168 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
169 | zlog_debug("Route[External]: type-2 created."); | |
170 | new->path_type = OSPF_PATH_TYPE2_EXTERNAL; | |
171 | new->cost = asbr_route->cost; /* X */ | |
172 | new->u.ext.type2_cost = metric; /* Y */ | |
173 | } | |
718e3744 | 174 | |
d62a17ae | 175 | new->type = OSPF_DESTINATION_NETWORK; |
176 | new->u.ext.origin = lsa; | |
177 | new->u.ext.tag = ntohl(al->e[0].route_tag); | |
178 | new->u.ext.asbr = asbr_route; | |
718e3744 | 179 | |
d62a17ae | 180 | assert(new != asbr_route); |
718e3744 | 181 | |
d62a17ae | 182 | return new; |
718e3744 | 183 | } |
184 | ||
185 | #define OSPF_ASE_CALC_INTERVAL 1 | |
186 | ||
d62a17ae | 187 | int ospf_ase_calculate_route(struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 188 | { |
d7c0a89a | 189 | uint32_t metric; |
d62a17ae | 190 | struct as_external_lsa *al; |
191 | struct ospf_route *asbr_route; | |
192 | struct prefix_ipv4 asbr, p; | |
193 | struct route_node *rn; | |
194 | struct ospf_route *new, * or ; | |
195 | int ret; | |
196 | ||
197 | assert(lsa); | |
198 | al = (struct as_external_lsa *)lsa->data; | |
199 | ||
200 | if (lsa->data->type == OSPF_AS_NSSA_LSA) | |
201 | if (IS_DEBUG_OSPF_NSSA) | |
70ad0b66 | 202 | zlog_debug("%s: Processing Type-7", __func__); |
d62a17ae | 203 | |
204 | /* Stay away from any Local Translated Type-7 LSAs */ | |
205 | if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) { | |
206 | if (IS_DEBUG_OSPF_NSSA) | |
70ad0b66 | 207 | zlog_debug("%s: Rejecting Local Xlt'd", __func__); |
d62a17ae | 208 | return 0; |
718e3744 | 209 | } |
718e3744 | 210 | |
96065dc3 | 211 | if (IS_DEBUG_OSPF(lsa, LSA)) { |
d62a17ae | 212 | zlog_debug( |
96b663a3 MS |
213 | "Route[External]: Calculate AS-external-LSA to %pI4/%d adv_router %pI4", |
214 | &al->header.id, ip_masklen(al->mask), | |
215 | &al->header.adv_router); | |
96065dc3 CS |
216 | } |
217 | ||
d62a17ae | 218 | /* (1) If the cost specified by the LSA is LSInfinity, or if the |
219 | LSA's LS age is equal to MaxAge, then examine the next LSA. */ | |
220 | if ((metric = GET_METRIC(al->e[0].metric)) >= OSPF_LS_INFINITY) { | |
221 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
222 | zlog_debug( | |
223 | "Route[External]: Metric is OSPF_LS_INFINITY"); | |
224 | return 0; | |
225 | } | |
226 | if (IS_LSA_MAXAGE(lsa)) { | |
227 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
228 | zlog_debug( | |
229 | "Route[External]: AS-external-LSA is MAXAGE"); | |
230 | return 0; | |
718e3744 | 231 | } |
232 | ||
d62a17ae | 233 | /* (2) If the LSA was originated by the calculating router itself, |
234 | examine the next LSA. */ | |
235 | if (IS_LSA_SELF(lsa)) { | |
236 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
237 | zlog_debug( | |
238 | "Route[External]: AS-external-LSA is self originated"); | |
239 | return 0; | |
240 | } | |
718e3744 | 241 | |
d62a17ae | 242 | /* (3) Call the destination described by the LSA N. N's address is |
243 | obtained by masking the LSA's Link State ID with the | |
244 | network/subnet mask contained in the body of the LSA. Look | |
245 | up the routing table entries (potentially one per attached | |
246 | area) for the AS boundary router (ASBR) that originated the | |
247 | LSA. If no entries exist for router ASBR (i.e., ASBR is | |
248 | unreachable), do nothing with this LSA and consider the next | |
249 | in the list. */ | |
250 | ||
251 | asbr.family = AF_INET; | |
252 | asbr.prefix = al->header.adv_router; | |
253 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
254 | apply_mask_ipv4(&asbr); | |
255 | ||
256 | asbr_route = ospf_find_asbr_route(ospf, ospf->new_rtrs, &asbr); | |
257 | if (asbr_route == NULL) { | |
258 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
259 | zlog_debug( | |
260 | "Route[External]: Can't find originating ASBR route"); | |
261 | return 0; | |
262 | } | |
263 | if (!(asbr_route->u.std.flags & ROUTER_LSA_EXTERNAL)) { | |
264 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
265 | zlog_debug( | |
266 | "Route[External]: Originating router is not an ASBR"); | |
267 | return 0; | |
268 | } | |
718e3744 | 269 | |
bf4b7559 | 270 | /* Type-5 shouldn't be calculated if it is originated from NSSA ASBR. |
271 | * As per RFC 3101, expectation is to receive type-7 lsas from | |
272 | * NSSA ASBR. Ignore calculation, if the current LSA is type-5 and | |
273 | * originated ASBR's area is NSSA. | |
274 | */ | |
275 | if ((lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
276 | && (asbr_route->u.std.external_routing != OSPF_AREA_DEFAULT)) { | |
277 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
278 | zlog_debug( | |
279 | "Route[External]: Ignore, If type-5 LSA from NSSA area."); | |
280 | return 0; | |
281 | } | |
282 | ||
d62a17ae | 283 | /* Else, this LSA describes an AS external path to destination |
284 | N. Examine the forwarding address specified in the AS- | |
285 | external-LSA. This indicates the IP address to which | |
286 | packets for the destination should be forwarded. */ | |
287 | ||
975a328e | 288 | if (al->e[0].fwd_addr.s_addr == INADDR_ANY) { |
d62a17ae | 289 | /* If the forwarding address is set to 0.0.0.0, packets should |
290 | be sent to the ASBR itself. Among the multiple routing table | |
291 | entries for the ASBR, select the preferred entry as follows. | |
292 | If RFC1583Compatibility is set to "disabled", prune the set | |
293 | of routing table entries for the ASBR as described in | |
294 | Section 16.4.1. In any case, among the remaining routing | |
295 | table entries, select the routing table entry with the least | |
296 | cost; when there are multiple least cost routing table | |
297 | entries the entry whose associated area has the largest OSPF | |
298 | Area ID (when considered as an unsigned 32-bit integer) is | |
299 | chosen. */ | |
300 | ||
301 | /* asbr_route already contains the requested route */ | |
302 | } else { | |
303 | /* If the forwarding address is non-zero, look up the | |
304 | forwarding address in the routing table.[24] The matching | |
305 | routing table entry must specify an intra-area or inter-area | |
306 | path; if no such path exists, do nothing with the LSA and | |
307 | consider the next in the list. */ | |
308 | if (!ospf_ase_forward_address_check(ospf, al->e[0].fwd_addr)) { | |
309 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
310 | zlog_debug( | |
3efd0893 | 311 | "Route[External]: Forwarding address is our router address"); |
d62a17ae | 312 | return 0; |
313 | } | |
314 | ||
315 | asbr.family = AF_INET; | |
316 | asbr.prefix = al->e[0].fwd_addr; | |
317 | asbr.prefixlen = IPV4_MAX_BITLEN; | |
318 | ||
319 | rn = route_node_match(ospf->new_table, (struct prefix *)&asbr); | |
320 | ||
321 | if (rn == NULL || (asbr_route = rn->info) == NULL) { | |
322 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
323 | zlog_debug( | |
3efd0893 | 324 | "Route[External]: Can't find route to forwarding address"); |
d62a17ae | 325 | if (rn) |
326 | route_unlock_node(rn); | |
327 | return 0; | |
328 | } | |
329 | ||
330 | route_unlock_node(rn); | |
718e3744 | 331 | } |
d62a17ae | 332 | |
333 | /* (4) Let X be the cost specified by the preferred routing table | |
334 | entry for the ASBR/forwarding address, and Y the cost | |
335 | specified in the LSA. X is in terms of the link state | |
336 | metric, and Y is a type 1 or 2 external metric. */ | |
337 | ||
338 | ||
339 | /* (5) Look up the routing table entry for the destination N. If | |
340 | no entry exists for N, install the AS external path to N, | |
341 | with next hop equal to the list of next hops to the | |
342 | forwarding address, and advertising router equal to ASBR. | |
343 | If the external metric type is 1, then the path-type is set | |
344 | to type 1 external and the cost is equal to X+Y. If the | |
345 | external metric type is 2, the path-type is set to type 2 | |
346 | external, the link state component of the route's cost is X, | |
347 | and the type 2 cost is Y. */ | |
348 | new = ospf_ase_calculate_new_route(lsa, asbr_route, metric); | |
349 | ||
350 | /* (6) Compare the AS external path described by the LSA with the | |
351 | existing paths in N's routing table entry, as follows. If | |
352 | the new path is preferred, it replaces the present paths in | |
353 | N's routing table entry. If the new path is of equal | |
354 | preference, it is added to N's routing table entry's list of | |
355 | paths. */ | |
356 | ||
357 | /* Set prefix. */ | |
358 | p.family = AF_INET; | |
359 | p.prefix = al->header.id; | |
360 | p.prefixlen = ip_masklen(al->mask); | |
361 | ||
362 | /* if there is a Intra/Inter area route to the N | |
363 | do not install external route */ | |
364 | if ((rn = route_node_lookup(ospf->new_table, (struct prefix *)&p))) { | |
365 | route_unlock_node(rn); | |
366 | if (rn->info == NULL) | |
367 | zlog_info("Route[External]: rn->info NULL"); | |
368 | if (new) | |
369 | ospf_route_free(new); | |
370 | return 0; | |
718e3744 | 371 | } |
d62a17ae | 372 | /* Find a route to the same dest */ |
373 | /* If there is no route, create new one. */ | |
374 | if ((rn = route_node_lookup(ospf->new_external_route, | |
375 | (struct prefix *)&p))) | |
376 | route_unlock_node(rn); | |
377 | ||
378 | if (!rn || (or = rn->info) == NULL) { | |
379 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
96b663a3 MS |
380 | zlog_debug("Route[External]: Adding a new route %pFX with paths %u", |
381 | &p, listcount(asbr_route->paths)); | |
d62a17ae | 382 | |
383 | ospf_route_add(ospf->new_external_route, &p, new, asbr_route); | |
384 | ||
975a328e | 385 | if (al->e[0].fwd_addr.s_addr != INADDR_ANY) |
d62a17ae | 386 | ospf_ase_complete_direct_routes(new, al->e[0].fwd_addr); |
387 | return 0; | |
388 | } else { | |
389 | /* (a) Intra-area and inter-area paths are always preferred | |
390 | over AS external paths. | |
391 | ||
392 | (b) Type 1 external paths are always preferred over type 2 | |
393 | external paths. When all paths are type 2 external | |
394 | paths, the paths with the smallest advertised type 2 | |
395 | metric are always preferred. */ | |
396 | ret = ospf_route_cmp(ospf, new, or); | |
397 | ||
398 | /* (c) If the new AS external path is still | |
399 | indistinguishable | |
400 | from the current paths in the N's routing table | |
401 | entry, | |
402 | and RFC1583Compatibility is set to "disabled", select | |
403 | the preferred paths based on the intra-AS paths to | |
404 | the | |
405 | ASBR/forwarding addresses, as specified in Section | |
406 | 16.4.1. | |
407 | ||
408 | (d) If the new AS external path is still | |
409 | indistinguishable | |
410 | from the current paths in the N's routing table | |
411 | entry, | |
412 | select the preferred path based on a least cost | |
413 | comparison. Type 1 external paths are compared by | |
414 | looking at the sum of the distance to the forwarding | |
415 | address and the advertised type 1 metric (X+Y). Type | |
416 | 2 | |
417 | external paths advertising equal type 2 metrics are | |
418 | compared by looking at the distance to the forwarding | |
419 | addresses. | |
420 | */ | |
421 | /* New route is better */ | |
422 | if (ret < 0) { | |
423 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
424 | zlog_debug( | |
425 | "Route[External]: New route is better"); | |
426 | ospf_route_subst(rn, new, asbr_route); | |
975a328e | 427 | if (al->e[0].fwd_addr.s_addr != INADDR_ANY) |
d62a17ae | 428 | ospf_ase_complete_direct_routes( |
429 | new, al->e[0].fwd_addr); | |
430 | or = new; | |
431 | new = NULL; | |
432 | } | |
433 | /* Old route is better */ | |
434 | else if (ret > 0) { | |
435 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
436 | zlog_debug( | |
437 | "Route[External]: Old route is better"); | |
438 | /* do nothing */ | |
439 | } | |
440 | /* Routes are equal */ | |
441 | else { | |
442 | if (IS_DEBUG_OSPF(lsa, LSA)) | |
443 | zlog_debug("Route[External]: Routes are equal"); | |
444 | ospf_route_copy_nexthops(or, asbr_route->paths); | |
975a328e | 445 | if (al->e[0].fwd_addr.s_addr != INADDR_ANY) |
d62a17ae | 446 | ospf_ase_complete_direct_routes( |
447 | or, al->e[0].fwd_addr); | |
448 | } | |
718e3744 | 449 | } |
d62a17ae | 450 | /* Make sure setting newly calculated ASBR route.*/ |
451 | or->u.ext.asbr = asbr_route; | |
452 | if (new) | |
453 | ospf_route_free(new); | |
718e3744 | 454 | |
d62a17ae | 455 | lsa->route = or ; |
456 | return 0; | |
718e3744 | 457 | } |
458 | ||
d62a17ae | 459 | static int ospf_ase_route_match_same(struct route_table *rt, |
460 | struct prefix *prefix, | |
461 | struct ospf_route *newor) | |
718e3744 | 462 | { |
d62a17ae | 463 | struct route_node *rn; |
2ffc213b | 464 | struct ospf_route *or; |
d62a17ae | 465 | struct ospf_path *op; |
466 | struct ospf_path *newop; | |
467 | struct listnode *n1; | |
468 | struct listnode *n2; | |
469 | ||
470 | if (!rt || !prefix) | |
471 | return 0; | |
472 | ||
473 | rn = route_node_lookup(rt, prefix); | |
474 | if (!rn) | |
475 | return 0; | |
476 | ||
477 | route_unlock_node(rn); | |
478 | ||
479 | or = rn->info; | |
2ffc213b A |
480 | |
481 | assert(or); | |
482 | ||
d62a17ae | 483 | if (or->path_type != newor->path_type) |
484 | return 0; | |
485 | ||
486 | switch (or->path_type) { | |
487 | case OSPF_PATH_TYPE1_EXTERNAL: | |
488 | if (or->cost != newor->cost) | |
489 | return 0; | |
490 | break; | |
491 | case OSPF_PATH_TYPE2_EXTERNAL: | |
492 | if ((or->cost != newor->cost) | |
493 | || (or->u.ext.type2_cost != newor->u.ext.type2_cost)) | |
494 | return 0; | |
495 | break; | |
496 | default: | |
497 | assert(0); | |
498 | return 0; | |
499 | } | |
500 | ||
2ffc213b A |
501 | assert(or->paths); |
502 | ||
d62a17ae | 503 | if (or->paths->count != newor->paths->count) |
504 | return 0; | |
505 | ||
506 | /* Check each path. */ | |
507 | for (n1 = listhead(or->paths), n2 = listhead(newor->paths); n1 && n2; | |
39050c7e | 508 | n1 = listnextnode_unchecked(n1), n2 = listnextnode_unchecked(n2)) { |
d62a17ae | 509 | op = listgetdata(n1); |
510 | newop = listgetdata(n2); | |
511 | ||
512 | if (!IPV4_ADDR_SAME(&op->nexthop, &newop->nexthop)) | |
513 | return 0; | |
514 | if (op->ifindex != newop->ifindex) | |
515 | return 0; | |
516 | } | |
517 | ||
518 | if (or->u.ext.tag != newor->u.ext.tag) | |
519 | return 0; | |
520 | ||
521 | return 1; | |
718e3744 | 522 | } |
523 | ||
b5a8894d CS |
524 | static int ospf_ase_compare_tables(struct ospf *ospf, |
525 | struct route_table *new_external_route, | |
d62a17ae | 526 | struct route_table *old_external_route) |
718e3744 | 527 | { |
d62a17ae | 528 | struct route_node *rn, *new_rn; |
529 | struct ospf_route * or ; | |
530 | ||
531 | /* Remove deleted routes */ | |
532 | for (rn = route_top(old_external_route); rn; rn = route_next(rn)) | |
533 | if ((or = rn->info)) { | |
534 | if (!(new_rn = route_node_lookup(new_external_route, | |
535 | &rn->p))) | |
996c9314 LB |
536 | ospf_zebra_delete( |
537 | ospf, (struct prefix_ipv4 *)&rn->p, or); | |
d62a17ae | 538 | else |
539 | route_unlock_node(new_rn); | |
540 | } | |
541 | ||
542 | ||
543 | /* Install new routes */ | |
544 | for (rn = route_top(new_external_route); rn; rn = route_next(rn)) | |
545 | if ((or = rn->info) != NULL) | |
546 | if (!ospf_ase_route_match_same(old_external_route, | |
547 | &rn->p, or)) | |
996c9314 LB |
548 | ospf_zebra_add( |
549 | ospf, (struct prefix_ipv4 *)&rn->p, or); | |
d62a17ae | 550 | |
551 | return 0; | |
718e3744 | 552 | } |
553 | ||
e6685141 | 554 | static void ospf_ase_calculate_timer(struct event *t) |
718e3744 | 555 | { |
d62a17ae | 556 | struct ospf *ospf; |
557 | struct ospf_lsa *lsa; | |
558 | struct route_node *rn; | |
559 | struct listnode *node; | |
560 | struct ospf_area *area; | |
561 | struct timeval start_time, stop_time; | |
562 | ||
e16d030c | 563 | ospf = EVENT_ARG(t); |
d62a17ae | 564 | ospf->t_ase_calc = NULL; |
565 | ||
566 | if (ospf->ase_calc) { | |
567 | ospf->ase_calc = 0; | |
568 | ||
569 | monotime(&start_time); | |
570 | ||
571 | /* Calculate external route for each AS-external-LSA */ | |
996c9314 | 572 | LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa) |
044506e7 | 573 | ospf_ase_calculate_route(ospf, lsa); |
d62a17ae | 574 | |
575 | /* This version simple adds to the table all NSSA areas */ | |
576 | if (ospf->anyNSSA) | |
577 | for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) { | |
578 | if (IS_DEBUG_OSPF_NSSA) | |
70ad0b66 | 579 | zlog_debug("%s: looking at area %pI4", |
580 | __func__, &area->area_id); | |
d62a17ae | 581 | |
582 | if (area->external_routing == OSPF_AREA_NSSA) | |
996c9314 | 583 | LSDB_LOOP (NSSA_LSDB(area), rn, lsa) |
044506e7 DS |
584 | ospf_ase_calculate_route(ospf, |
585 | lsa); | |
d62a17ae | 586 | } |
587 | /* kevinm: And add the NSSA routes in ospf_top */ | |
996c9314 | 588 | LSDB_LOOP (NSSA_LSDB(ospf), rn, lsa) |
044506e7 | 589 | ospf_ase_calculate_route(ospf, lsa); |
d62a17ae | 590 | |
591 | /* Compare old and new external routing table and install the | |
592 | difference info zebra/kernel */ | |
b5a8894d | 593 | ospf_ase_compare_tables(ospf, ospf->new_external_route, |
d62a17ae | 594 | ospf->old_external_route); |
595 | ||
596 | /* Delete old external routing table */ | |
597 | ospf_route_table_free(ospf->old_external_route); | |
598 | ospf->old_external_route = ospf->new_external_route; | |
599 | ospf->new_external_route = route_table_init(); | |
600 | ||
601 | monotime(&stop_time); | |
602 | ||
05ba78e4 | 603 | if (IS_DEBUG_OSPF_EVENT) |
996c9314 | 604 | zlog_info( |
63efca0e | 605 | "SPF Processing Time(usecs): External Routes: %lld", |
996c9314 LB |
606 | (stop_time.tv_sec - start_time.tv_sec) |
607 | * 1000000LL | |
608 | + (stop_time.tv_usec | |
609 | - start_time.tv_usec)); | |
d62a17ae | 610 | } |
10514170 RW |
611 | |
612 | /* | |
613 | * Uninstall remnant routes that were installed before the restart, but | |
614 | * that are no longer valid. | |
615 | */ | |
616 | if (ospf->gr_info.finishing_restart) { | |
617 | ospf_zebra_gr_disable(ospf); | |
ab749e7e | 618 | ospf_zebra_gr_enable(ospf, ospf->gr_info.grace_period); |
10514170 RW |
619 | ospf->gr_info.finishing_restart = false; |
620 | } | |
718e3744 | 621 | } |
622 | ||
d62a17ae | 623 | void ospf_ase_calculate_schedule(struct ospf *ospf) |
718e3744 | 624 | { |
d62a17ae | 625 | if (ospf == NULL) |
626 | return; | |
718e3744 | 627 | |
d62a17ae | 628 | ospf->ase_calc = 1; |
718e3744 | 629 | } |
630 | ||
d62a17ae | 631 | void ospf_ase_calculate_timer_add(struct ospf *ospf) |
718e3744 | 632 | { |
d62a17ae | 633 | if (ospf == NULL) |
634 | return; | |
718e3744 | 635 | |
907a2395 DS |
636 | event_add_timer(master, ospf_ase_calculate_timer, ospf, |
637 | OSPF_ASE_CALC_INTERVAL, &ospf->t_ase_calc); | |
718e3744 | 638 | } |
639 | ||
d62a17ae | 640 | void ospf_ase_register_external_lsa(struct ospf_lsa *lsa, struct ospf *top) |
718e3744 | 641 | { |
d62a17ae | 642 | struct route_node *rn; |
643 | struct prefix_ipv4 p; | |
644 | struct list *lst; | |
645 | struct as_external_lsa *al; | |
646 | ||
647 | al = (struct as_external_lsa *)lsa->data; | |
648 | p.family = AF_INET; | |
649 | p.prefix = lsa->data->id; | |
650 | p.prefixlen = ip_masklen(al->mask); | |
651 | apply_mask_ipv4(&p); | |
652 | ||
653 | rn = route_node_get(top->external_lsas, (struct prefix *)&p); | |
654 | if ((lst = rn->info) == NULL) | |
655 | rn->info = lst = list_new(); | |
656 | else | |
657 | route_unlock_node(rn); | |
658 | ||
659 | /* We assume that if LSA is deleted from DB | |
660 | is is also deleted from this RT */ | |
661 | listnode_add(lst, ospf_lsa_lock(lsa)); /* external_lsas lst */ | |
718e3744 | 662 | } |
663 | ||
d62a17ae | 664 | void ospf_ase_unregister_external_lsa(struct ospf_lsa *lsa, struct ospf *top) |
718e3744 | 665 | { |
d62a17ae | 666 | struct route_node *rn; |
667 | struct prefix_ipv4 p; | |
668 | struct list *lst; | |
669 | struct as_external_lsa *al; | |
670 | ||
671 | al = (struct as_external_lsa *)lsa->data; | |
672 | p.family = AF_INET; | |
673 | p.prefix = lsa->data->id; | |
674 | p.prefixlen = ip_masklen(al->mask); | |
675 | apply_mask_ipv4(&p); | |
676 | ||
677 | rn = route_node_lookup(top->external_lsas, (struct prefix *)&p); | |
678 | ||
679 | if (rn) { | |
680 | lst = rn->info; | |
87627de6 MR |
681 | struct listnode *node = listnode_lookup(lst, lsa); |
682 | /* Unlock lsa only if node is present in the list */ | |
683 | if (node) { | |
684 | listnode_delete(lst, lsa); | |
685 | ospf_lsa_unlock(&lsa); /* external_lsas list */ | |
686 | } | |
f91ce319 | 687 | |
d62a17ae | 688 | route_unlock_node(rn); |
689 | } | |
718e3744 | 690 | } |
691 | ||
d62a17ae | 692 | void ospf_ase_external_lsas_finish(struct route_table *rt) |
718e3744 | 693 | { |
d62a17ae | 694 | struct route_node *rn; |
695 | struct ospf_lsa *lsa; | |
696 | struct list *lst; | |
697 | struct listnode *node, *nnode; | |
698 | ||
699 | for (rn = route_top(rt); rn; rn = route_next(rn)) | |
700 | if ((lst = rn->info) != NULL) { | |
701 | for (ALL_LIST_ELEMENTS(lst, node, nnode, lsa)) | |
702 | ospf_lsa_unlock(&lsa); /* external_lsas lst */ | |
6a154c88 | 703 | list_delete(&lst); |
d62a17ae | 704 | } |
705 | ||
706 | route_table_finish(rt); | |
718e3744 | 707 | } |
708 | ||
d62a17ae | 709 | void ospf_ase_incremental_update(struct ospf *ospf, struct ospf_lsa *lsa) |
718e3744 | 710 | { |
d62a17ae | 711 | struct list *lsas; |
712 | struct listnode *node; | |
713 | struct route_node *rn, *rn2; | |
714 | struct prefix_ipv4 p; | |
715 | struct route_table *tmp_old; | |
716 | struct as_external_lsa *al; | |
717 | ||
718 | al = (struct as_external_lsa *)lsa->data; | |
719 | p.family = AF_INET; | |
720 | p.prefix = lsa->data->id; | |
721 | p.prefixlen = ip_masklen(al->mask); | |
722 | apply_mask_ipv4(&p); | |
723 | ||
724 | /* if new_table is NULL, there was no spf calculation, thus | |
725 | incremental update is unneeded */ | |
726 | if (!ospf->new_table) | |
727 | return; | |
728 | ||
729 | /* If there is already an intra-area or inter-area route | |
730 | to the destination, no recalculation is necessary | |
731 | (internal routes take precedence). */ | |
732 | ||
733 | rn = route_node_lookup(ospf->new_table, (struct prefix *)&p); | |
734 | if (rn) { | |
735 | route_unlock_node(rn); | |
736 | if (rn->info) | |
737 | return; | |
738 | } | |
718e3744 | 739 | |
d62a17ae | 740 | rn = route_node_lookup(ospf->external_lsas, (struct prefix *)&p); |
741 | assert(rn); | |
742 | assert(rn->info); | |
743 | lsas = rn->info; | |
744 | route_unlock_node(rn); | |
745 | ||
746 | for (ALL_LIST_ELEMENTS_RO(lsas, node, lsa)) | |
747 | ospf_ase_calculate_route(ospf, lsa); | |
748 | ||
749 | /* prepare temporary old routing table for compare */ | |
750 | tmp_old = route_table_init(); | |
751 | rn = route_node_lookup(ospf->old_external_route, (struct prefix *)&p); | |
752 | if (rn && rn->info) { | |
753 | rn2 = route_node_get(tmp_old, (struct prefix *)&p); | |
754 | rn2->info = rn->info; | |
755 | route_unlock_node(rn); | |
756 | } | |
718e3744 | 757 | |
d62a17ae | 758 | /* install changes to zebra */ |
b5a8894d | 759 | ospf_ase_compare_tables(ospf, ospf->new_external_route, tmp_old); |
d62a17ae | 760 | |
761 | /* update ospf->old_external_route table */ | |
762 | if (rn && rn->info) | |
763 | ospf_route_free((struct ospf_route *)rn->info); | |
764 | ||
765 | rn2 = route_node_lookup(ospf->new_external_route, (struct prefix *)&p); | |
766 | /* if new route exists, install it to ospf->old_external_route */ | |
767 | if (rn2 && rn2->info) { | |
768 | if (!rn) | |
769 | rn = route_node_get(ospf->old_external_route, | |
770 | (struct prefix *)&p); | |
771 | rn->info = rn2->info; | |
772 | } else { | |
773 | /* remove route node from ospf->old_external_route */ | |
774 | if (rn) { | |
775 | rn->info = NULL; | |
776 | route_unlock_node(rn); | |
777 | } | |
718e3744 | 778 | } |
718e3744 | 779 | |
d62a17ae | 780 | if (rn2) { |
781 | /* rn2->info is stored in route node of ospf->old_external_route | |
782 | */ | |
783 | rn2->info = NULL; | |
784 | route_unlock_node(rn2); | |
785 | route_unlock_node(rn2); | |
786 | } | |
718e3744 | 787 | |
d62a17ae | 788 | route_table_finish(tmp_old); |
718e3744 | 789 | } |