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Commit | Line | Data |
---|---|---|
dfa9a53a | 1 | /* |
70945cb6 | 2 | * BIRD -- OSPF |
742029eb | 3 | * |
70945cb6 OZ |
4 | * (c) 2000--2004 Ondrej Filip <feela@network.cz> |
5 | * (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org> | |
6 | * (c) 2009--2014 CZ.NIC z.s.p.o. | |
742029eb | 7 | * |
70945cb6 | 8 | * Can be freely distributed and used under the terms of the GNU GPL. |
dfa9a53a OF |
9 | */ |
10 | ||
11 | #include "ospf.h" | |
5d3f5552 | 12 | |
742029eb | 13 | static void add_cand(list * l, struct top_hash_entry *en, |
b49e6f5a | 14 | struct top_hash_entry *par, u32 dist, |
e7b4948c | 15 | struct ospf_area *oa, int i); |
70945cb6 | 16 | static void rt_sync(struct ospf_proto *p); |
c3226991 OZ |
17 | |
18 | ||
57c574d8 | 19 | static inline void reset_ri(ort *ort) |
1a61882d | 20 | { |
57c574d8 | 21 | bzero(&ort->n, sizeof(orta)); |
1a61882d | 22 | } |
dfa9a53a | 23 | |
a92847e7 | 24 | void |
1a61882d | 25 | ospf_rt_initort(struct fib_node *fn) |
a92847e7 | 26 | { |
1a61882d | 27 | ort *ri = (ort *) fn; |
57c574d8 OZ |
28 | reset_ri(ri); |
29 | ri->old_rta = NULL; | |
70945cb6 | 30 | ri->fn.flags = 0; |
1a61882d | 31 | } |
a92847e7 | 32 | |
57c574d8 | 33 | static inline int |
145368f5 | 34 | nh_is_vlink(struct mpnh *nhs) |
57c574d8 | 35 | { |
145368f5 OZ |
36 | return !nhs->iface; |
37 | } | |
38 | ||
39 | static inline int | |
40 | unresolved_vlink(ort *ort) | |
41 | { | |
42 | return ort->n.nhs && nh_is_vlink(ort->n.nhs); | |
57c574d8 OZ |
43 | } |
44 | ||
45 | static inline struct mpnh * | |
e348ef01 | 46 | new_nexthop(struct ospf_proto *p, ip_addr gw, struct iface *iface, byte weight) |
57c574d8 | 47 | { |
70945cb6 | 48 | struct mpnh *nh = lp_alloc(p->nhpool, sizeof(struct mpnh)); |
57c574d8 OZ |
49 | nh->gw = gw; |
50 | nh->iface = iface; | |
51 | nh->next = NULL; | |
52 | nh->weight = weight; | |
53 | return nh; | |
54 | } | |
55 | ||
145368f5 | 56 | /* Returns true if there are device nexthops in n */ |
6384c7d7 | 57 | static inline int |
145368f5 | 58 | has_device_nexthops(const struct mpnh *n) |
6384c7d7 | 59 | { |
145368f5 OZ |
60 | for (; n; n = n->next) |
61 | if (ipa_zero(n->gw)) | |
62 | return 1; | |
63 | ||
64 | return 0; | |
6384c7d7 OZ |
65 | } |
66 | ||
145368f5 OZ |
67 | /* Replace device nexthops with nexthops to gw */ |
68 | static struct mpnh * | |
70945cb6 | 69 | fix_device_nexthops(struct ospf_proto *p, const struct mpnh *n, ip_addr gw) |
3b89a232 | 70 | { |
145368f5 OZ |
71 | struct mpnh *root1 = NULL; |
72 | struct mpnh *root2 = NULL; | |
73 | struct mpnh **nn1 = &root1; | |
74 | struct mpnh **nn2 = &root2; | |
3b89a232 | 75 | |
ef3cac66 OZ |
76 | if (!p->ecmp) |
77 | return new_nexthop(p, gw, n->iface, n->weight); | |
78 | ||
145368f5 OZ |
79 | /* This is a bit tricky. We cannot just copy the list and update n->gw, |
80 | because the list should stay sorted, so we create two lists, one with new | |
81 | gateways and one with old ones, and then merge them. */ | |
3b89a232 | 82 | |
145368f5 OZ |
83 | for (; n; n = n->next) |
84 | { | |
70945cb6 | 85 | struct mpnh *nn = new_nexthop(p, ipa_zero(n->gw) ? gw : n->gw, n->iface, n->weight); |
3b89a232 | 86 | |
145368f5 OZ |
87 | if (ipa_zero(n->gw)) |
88 | { | |
89 | *nn1 = nn; | |
90 | nn1 = &(nn->next); | |
91 | } | |
92 | else | |
93 | { | |
94 | *nn2 = nn; | |
95 | nn2 = &(nn->next); | |
96 | } | |
3b16080c | 97 | } |
98ac6176 | 98 | |
d217ba51 | 99 | return mpnh_merge(root1, root2, 1, 1, p->ecmp, p->nhpool); |
145368f5 | 100 | } |
1a61882d | 101 | |
1a61882d | 102 | |
145368f5 OZ |
103 | /* Whether the ASBR or the forward address destination is preferred |
104 | in AS external route selection according to 16.4.1. */ | |
105 | static inline int | |
106 | epath_preferred(const orta *ep) | |
107 | { | |
108 | return (ep->type == RTS_OSPF) && (ep->oa->areaid != 0); | |
109 | } | |
3b89a232 | 110 | |
145368f5 OZ |
111 | /* Whether the ext route has ASBR/next_hop marked as preferred. */ |
112 | static inline int | |
113 | orta_pref(const orta *nf) | |
114 | { | |
115 | return !!(nf->options & ORTA_PREF); | |
3b89a232 OZ |
116 | } |
117 | ||
145368f5 OZ |
118 | /* Classify orta entries according to RFC 3101 2.5 (6e) priorities: |
119 | Type-7 LSA with P-bit, Type-5 LSA, Type-7 LSA without P-bit */ | |
ed317862 | 120 | static int |
145368f5 | 121 | orta_prio(const orta *nf) |
ed317862 OZ |
122 | { |
123 | /* RFC 3103 2.5 (6e) priorities */ | |
124 | u32 opts = nf->options & (ORTA_NSSA | ORTA_PROP); | |
125 | ||
126 | /* A Type-7 LSA with the P-bit set */ | |
127 | if (opts == (ORTA_NSSA | ORTA_PROP)) | |
128 | return 2; | |
129 | ||
130 | /* A Type-5 LSA */ | |
131 | if (opts == 0) | |
132 | return 1; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
145368f5 OZ |
137 | /* Whether the route is better according to RFC 3101 2.5 (6e): |
138 | Prioritize Type-7 LSA with P-bit, then Type-5 LSA, then higher router ID */ | |
139 | static int | |
140 | orta_prefer_lsa(const orta *new, const orta *old) | |
141 | { | |
142 | int pn = orta_prio(new); | |
143 | int po = orta_prio(old); | |
144 | ||
145 | return (pn > po) || ((pn == po) && (new->en->lsa.rt > old->en->lsa.rt)); | |
146 | } | |
147 | ||
148 | /* | |
149 | * Compare an existing routing table entry with a new one. Applicable for | |
150 | * intra-area routes, inter-area routes and router entries. Returns integer | |
151 | * <, = or > than 0 if the new orta is less, equal or more preferred than | |
152 | * the old orta. | |
153 | */ | |
3b89a232 | 154 | static int |
70945cb6 | 155 | orta_compare(const struct ospf_proto *p, const orta *new, const orta *old) |
3b89a232 | 156 | { |
145368f5 OZ |
157 | int r; |
158 | ||
3b89a232 OZ |
159 | if (old->type == RTS_DUMMY) |
160 | return 1; | |
161 | ||
145368f5 OZ |
162 | /* Prefer intra-area to inter-area to externals */ |
163 | r = ((int) old->type) - ((int) new->type); | |
164 | if (r) return r; | |
165 | ||
166 | /* Prefer lowest type 1 metric */ | |
167 | r = ((int) old->metric1) - ((int) new->metric1); | |
168 | if (r) return r; | |
169 | ||
170 | ||
171 | /* Rest is BIRD-specific */ | |
172 | ||
173 | /* Area-wide routes should not mix next-hops from different areas. | |
174 | This generally should not happen unless there is some misconfiguration. */ | |
175 | if (new->oa->areaid != old->oa->areaid) | |
176 | return (new->oa->areaid > old->oa->areaid) ? 1 : -1; | |
177 | ||
178 | /* Prefer routes for configured stubnets (!nhs) to regular routes to dummy | |
179 | vlink nexthops. We intentionally return -1 if both are stubnets or vlinks. */ | |
180 | if (!old->nhs) | |
181 | return -1; | |
182 | if (!new->nhs) | |
3b89a232 | 183 | return 1; |
145368f5 OZ |
184 | if (nh_is_vlink(new->nhs)) |
185 | return -1; | |
186 | if (nh_is_vlink(old->nhs)) | |
187 | return 1; | |
188 | ||
3b89a232 | 189 | |
70945cb6 | 190 | if (p->ecmp) |
3b89a232 OZ |
191 | return 0; |
192 | ||
145368f5 OZ |
193 | /* Prefer routes with higher Router ID, just to be more deterministic */ |
194 | if (new->rid > old->rid) | |
195 | return 1; | |
742029eb | 196 | |
145368f5 OZ |
197 | return -1; |
198 | } | |
3b89a232 | 199 | |
145368f5 OZ |
200 | /* |
201 | * Compare ASBR routing table entry with a new one, used for precompute ASBRs | |
202 | * for AS external route selection (RFC 2328 16.4 (3)), Returns integer < or > | |
203 | * than 0 if the new ASBR is less or more preferred than the old ASBR. | |
204 | */ | |
205 | static int | |
70945cb6 | 206 | orta_compare_asbr(const struct ospf_proto *p, const orta *new, const orta *old) |
145368f5 OZ |
207 | { |
208 | int r; | |
209 | ||
210 | if (old->type == RTS_DUMMY) | |
211 | return 1; | |
98ac6176 | 212 | |
70945cb6 | 213 | if (!p->rfc1583) |
1a61882d | 214 | { |
145368f5 OZ |
215 | r = epath_preferred(new) - epath_preferred(old); |
216 | if (r) return r; | |
1a61882d OF |
217 | } |
218 | ||
145368f5 OZ |
219 | r = ((int) old->metric1) - ((int) new->metric1); |
220 | if (r) return r; | |
221 | ||
222 | /* Larger area ID is preferred */ | |
223 | if (new->oa->areaid > old->oa->areaid) | |
1a61882d OF |
224 | return 1; |
225 | ||
145368f5 OZ |
226 | /* There is just one ASBR of that RID per area, so tie is not possible */ |
227 | return -1; | |
228 | } | |
1a61882d | 229 | |
145368f5 OZ |
230 | /* |
231 | * Compare a routing table entry with a new one, for AS external routes | |
232 | * (RFC 2328 16.4) and NSSA routes (RFC 3103 2.5), Returns integer <, = or > | |
233 | * than 0 if the new orta is less, equal or more preferred than the old orta. | |
234 | */ | |
235 | static int | |
70945cb6 | 236 | orta_compare_ext(const struct ospf_proto *p, const orta *new, const orta *old) |
145368f5 OZ |
237 | { |
238 | int r; | |
ed317862 | 239 | |
145368f5 | 240 | if (old->type == RTS_DUMMY) |
ed317862 OZ |
241 | return 1; |
242 | ||
145368f5 OZ |
243 | /* 16.4 (6a) - prefer routes with lower type */ |
244 | r = ((int) old->type) - ((int) new->type); | |
245 | if (r) return r; | |
246 | ||
247 | /* 16.4 (6b) - prefer routes with lower type 2 metric */ | |
248 | if (new->type == RTS_OSPF_EXT2) | |
249 | { | |
250 | r = ((int) old->metric2) - ((int) new->metric2); | |
251 | if (r) return r; | |
252 | } | |
253 | ||
254 | /* 16.4 (6c) - if not RFC1583, prefer routes with preferred ASBR/next_hop */ | |
70945cb6 | 255 | if (!p->rfc1583) |
145368f5 OZ |
256 | { |
257 | r = orta_pref(new) - orta_pref(old); | |
258 | if (r) return r; | |
259 | } | |
260 | ||
261 | /* 16.4 (6d) - prefer routes with lower type 1 metric */ | |
262 | r = ((int) old->metric1) - ((int) new->metric1); | |
263 | if (r) return r; | |
264 | ||
265 | ||
70945cb6 | 266 | if (p->ecmp && p->merge_external) |
ed317862 OZ |
267 | return 0; |
268 | ||
145368f5 OZ |
269 | /* |
270 | * RFC 3101 2.5 (6e) - prioritize Type-7 LSA with P-bit, then Type-5 LSA, then | |
271 | * LSA with higher router ID. Although this should apply just to functionally | |
272 | * equivalent LSAs (i.e. ones with the same non-zero forwarding address), we | |
273 | * use it also to disambiguate otherwise equally preferred nexthops. | |
274 | */ | |
275 | if (orta_prefer_lsa(new, old)) | |
ed317862 | 276 | return 1; |
41b612c3 | 277 | |
145368f5 OZ |
278 | return -1; |
279 | } | |
280 | ||
281 | ||
282 | static inline void | |
283 | ort_replace(ort *o, const orta *new) | |
284 | { | |
285 | memcpy(&o->n, new, sizeof(orta)); | |
286 | } | |
287 | ||
288 | static void | |
70945cb6 | 289 | ort_merge(struct ospf_proto *p, ort *o, const orta *new) |
145368f5 OZ |
290 | { |
291 | orta *old = &o->n; | |
292 | ||
293 | if (old->nhs != new->nhs) | |
294 | { | |
d217ba51 OZ |
295 | old->nhs = mpnh_merge(old->nhs, new->nhs, old->nhs_reuse, new->nhs_reuse, |
296 | p->ecmp, p->nhpool); | |
145368f5 OZ |
297 | old->nhs_reuse = 1; |
298 | } | |
299 | ||
300 | if (old->rid < new->rid) | |
301 | old->rid = new->rid; | |
3b89a232 | 302 | } |
1a61882d | 303 | |
145368f5 | 304 | static void |
70945cb6 | 305 | ort_merge_ext(struct ospf_proto *p, ort *o, const orta *new) |
145368f5 OZ |
306 | { |
307 | orta *old = &o->n; | |
308 | ||
309 | if (old->nhs != new->nhs) | |
310 | { | |
d217ba51 OZ |
311 | old->nhs = mpnh_merge(old->nhs, new->nhs, old->nhs_reuse, new->nhs_reuse, |
312 | p->ecmp, p->nhpool); | |
145368f5 OZ |
313 | old->nhs_reuse = 1; |
314 | } | |
315 | ||
316 | if (old->tag != new->tag) | |
317 | old->tag = 0; | |
318 | ||
319 | /* | |
320 | * Even with multipath, we store only one LSA in orta.en for the purpose of | |
321 | * NSSA/ext translation. Therefore, we apply procedures from RFC 3101 2.5 (6e) | |
322 | * to all chosen LSAs for given network, not just to functionally equivalent | |
323 | * ones (i.e. ones with the same non-zero forwarding address). | |
324 | */ | |
325 | if (orta_prefer_lsa(new, old)) | |
326 | { | |
327 | old->options = new->options; | |
328 | old->rid = new->rid; | |
329 | old->oa = new->oa; | |
330 | old->en = new->en; | |
331 | } | |
332 | } | |
333 | ||
334 | ||
335 | ||
3b89a232 | 336 | static inline void |
70945cb6 | 337 | ri_install_net(struct ospf_proto *p, ip_addr prefix, int pxlen, const orta *new) |
3b89a232 | 338 | { |
70945cb6 OZ |
339 | ort *old = (ort *) fib_get(&p->rtf, &prefix, pxlen); |
340 | int cmp = orta_compare(p, new, &old->n); | |
145368f5 OZ |
341 | |
342 | if (cmp > 0) | |
343 | ort_replace(old, new); | |
344 | else if (cmp == 0) | |
70945cb6 | 345 | ort_merge(p, old, new); |
a92847e7 OF |
346 | } |
347 | ||
3b89a232 | 348 | static inline void |
145368f5 | 349 | ri_install_rt(struct ospf_area *oa, u32 rid, const orta *new) |
aa1e082c | 350 | { |
3b89a232 OZ |
351 | ip_addr addr = ipa_from_rid(rid); |
352 | ort *old = (ort *) fib_get(&oa->rtr, &addr, MAX_PREFIX_LENGTH); | |
145368f5 OZ |
353 | int cmp = orta_compare(oa->po, new, &old->n); |
354 | ||
355 | if (cmp > 0) | |
356 | ort_replace(old, new); | |
357 | else if (cmp == 0) | |
358 | ort_merge(oa->po, old, new); | |
3b89a232 | 359 | } |
1a61882d | 360 | |
3b89a232 | 361 | static inline void |
70945cb6 | 362 | ri_install_asbr(struct ospf_proto *p, ip_addr *addr, const orta *new) |
3b89a232 | 363 | { |
70945cb6 OZ |
364 | ort *old = (ort *) fib_get(&p->backbone->rtr, addr, MAX_PREFIX_LENGTH); |
365 | if (orta_compare_asbr(p, new, &old->n) > 0) | |
145368f5 | 366 | ort_replace(old, new); |
3b89a232 | 367 | } |
98ac6176 | 368 | |
3b89a232 | 369 | static inline void |
70945cb6 | 370 | ri_install_ext(struct ospf_proto *p, ip_addr prefix, int pxlen, const orta *new) |
3b89a232 | 371 | { |
70945cb6 OZ |
372 | ort *old = (ort *) fib_get(&p->rtf, &prefix, pxlen); |
373 | int cmp = orta_compare_ext(p, new, &old->n); | |
145368f5 OZ |
374 | |
375 | if (cmp > 0) | |
376 | ort_replace(old, new); | |
377 | else if (cmp == 0) | |
70945cb6 | 378 | ort_merge_ext(p, old, new); |
aa1e082c OF |
379 | } |
380 | ||
e7b4948c OZ |
381 | static inline struct ospf_iface * |
382 | rt_pos_to_ifa(struct ospf_area *oa, int pos) | |
e60d55be | 383 | { |
e7b4948c | 384 | struct ospf_iface *ifa; |
70945cb6 | 385 | |
e7b4948c | 386 | WALK_LIST(ifa, oa->po->iface_list) |
9008579b | 387 | if (ifa->oa == oa && pos >= ifa->rt_pos_beg && pos < ifa->rt_pos_end) |
e7b4948c | 388 | return ifa; |
70945cb6 | 389 | |
e60d55be OZ |
390 | return NULL; |
391 | } | |
392 | ||
e7b4948c OZ |
393 | static inline struct ospf_iface * |
394 | px_pos_to_ifa(struct ospf_area *oa, int pos) | |
e60d55be | 395 | { |
e7b4948c | 396 | struct ospf_iface *ifa; |
70945cb6 | 397 | |
e7b4948c | 398 | WALK_LIST(ifa, oa->po->iface_list) |
9008579b | 399 | if (ifa->oa == oa && pos >= ifa->px_pos_beg && pos < ifa->px_pos_end) |
e7b4948c | 400 | return ifa; |
70945cb6 | 401 | |
e60d55be OZ |
402 | return NULL; |
403 | } | |
e60d55be | 404 | |
e7b4948c | 405 | |
b49e6f5a | 406 | static void |
e7b4948c | 407 | add_network(struct ospf_area *oa, ip_addr px, int pxlen, int metric, struct top_hash_entry *en, int pos) |
b49e6f5a | 408 | { |
70945cb6 OZ |
409 | struct ospf_proto *p = oa->po; |
410 | ||
3b89a232 OZ |
411 | orta nf = { |
412 | .type = RTS_OSPF, | |
413 | .options = 0, | |
414 | .metric1 = metric, | |
415 | .metric2 = LSINFINITY, | |
416 | .tag = 0, | |
417 | .rid = en->lsa.rt, | |
418 | .oa = oa, | |
57c574d8 | 419 | .nhs = en->nhs |
3b89a232 | 420 | }; |
b49e6f5a | 421 | |
ab164971 OZ |
422 | if (pxlen < 0 || pxlen > MAX_PREFIX_LENGTH) |
423 | { | |
424 | log(L_WARN "%s: Invalid prefix in LSA (Type: %04x, Id: %R, Rt: %R)", | |
70945cb6 | 425 | p->p.name, en->lsa_type, en->lsa.id, en->lsa.rt); |
ab164971 OZ |
426 | return; |
427 | } | |
428 | ||
e60d55be OZ |
429 | if (en == oa->rt) |
430 | { | |
742029eb | 431 | /* |
e60d55be OZ |
432 | * Local stub networks does not have proper iface in en->nhi |
433 | * (because they all have common top_hash_entry en). | |
434 | * We have to find iface responsible for that stub network. | |
e0a62ad0 OZ |
435 | * Configured stubnets does not have any iface. They will |
436 | * be removed in rt_sync(). | |
e60d55be OZ |
437 | */ |
438 | ||
e7b4948c | 439 | struct ospf_iface *ifa; |
70945cb6 OZ |
440 | ifa = ospf_is_v2(p) ? rt_pos_to_ifa(oa, pos) : px_pos_to_ifa(oa, pos); |
441 | nf.nhs = ifa ? new_nexthop(p, IPA_NONE, ifa->iface, ifa->ecmp_weight) : NULL; | |
442 | } | |
443 | ||
444 | ri_install_net(p, px, pxlen, &nf); | |
445 | } | |
446 | ||
e7b4948c | 447 | |
70945cb6 OZ |
448 | |
449 | static inline void | |
450 | spfa_process_rt(struct ospf_proto *p, struct ospf_area *oa, struct top_hash_entry *act) | |
451 | { | |
452 | struct ospf_lsa_rt *rt = act->lsa_body; | |
453 | struct ospf_lsa_rt_walk rtl; | |
454 | struct top_hash_entry *tmp; | |
455 | ip_addr prefix; | |
456 | int pxlen, i; | |
457 | ||
458 | if (rt->options & OPT_RT_V) | |
459 | oa->trcap = 1; | |
460 | ||
461 | /* | |
462 | * In OSPFv3, all routers are added to per-area routing | |
463 | * tables. But we use it just for ASBRs and ABRs. For the | |
464 | * purpose of the last step in SPF - prefix-LSA processing in | |
465 | * spfa_process_prefixes(), we use information stored in LSA db. | |
466 | */ | |
467 | if (((rt->options & OPT_RT_E) || (rt->options & OPT_RT_B)) | |
468 | && (act->lsa.rt != p->router_id)) | |
469 | { | |
470 | orta nf = { | |
471 | .type = RTS_OSPF, | |
472 | .options = rt->options, | |
473 | .metric1 = act->dist, | |
474 | .metric2 = LSINFINITY, | |
475 | .tag = 0, | |
476 | .rid = act->lsa.rt, | |
477 | .oa = oa, | |
478 | .nhs = act->nhs | |
479 | }; | |
480 | ri_install_rt(oa, act->lsa.rt, &nf); | |
e60d55be OZ |
481 | } |
482 | ||
70945cb6 OZ |
483 | /* Errata 2078 to RFC 5340 4.8.1 - skip links from non-routing nodes */ |
484 | if (ospf_is_v3(p) && (act != oa->rt) && !(rt->options & OPT_R)) | |
a7a7372a | 485 | return; |
70945cb6 OZ |
486 | |
487 | /* Now process Rt links */ | |
488 | for (lsa_walk_rt_init(p, act, &rtl), i = 0; lsa_walk_rt(&rtl); i++) | |
489 | { | |
490 | tmp = NULL; | |
491 | ||
492 | switch (rtl.type) | |
493 | { | |
494 | case LSART_STUB: | |
495 | ||
496 | /* Should not happen, LSART_STUB is not defined in OSPFv3 */ | |
497 | if (ospf_is_v3(p)) | |
498 | break; | |
499 | ||
500 | /* | |
501 | * RFC 2328 in 16.1. (2a) says to handle stub networks in an | |
502 | * second phase after the SPF for an area is calculated. We get | |
503 | * the same result by handing them here because add_network() | |
504 | * will keep the best (not the first) found route. | |
505 | */ | |
506 | prefix = ipa_from_u32(rtl.id & rtl.data); | |
507 | pxlen = u32_masklen(rtl.data); | |
508 | add_network(oa, prefix, pxlen, act->dist + rtl.metric, act, i); | |
509 | break; | |
510 | ||
511 | case LSART_NET: | |
512 | tmp = ospf_hash_find_net(p->gr, oa->areaid, rtl.id, rtl.nif); | |
513 | break; | |
514 | ||
515 | case LSART_VLNK: | |
516 | case LSART_PTP: | |
517 | tmp = ospf_hash_find_rt(p->gr, oa->areaid, rtl.id); | |
518 | break; | |
519 | } | |
520 | ||
521 | add_cand(&oa->cand, tmp, act, act->dist + rtl.metric, oa, i); | |
522 | } | |
b49e6f5a OZ |
523 | } |
524 | ||
70945cb6 OZ |
525 | static inline void |
526 | spfa_process_net(struct ospf_proto *p, struct ospf_area *oa, struct top_hash_entry *act) | |
527 | { | |
528 | struct ospf_lsa_net *ln = act->lsa_body; | |
529 | struct top_hash_entry *tmp; | |
530 | ip_addr prefix; | |
531 | int pxlen, i, cnt; | |
532 | ||
533 | if (ospf_is_v2(p)) | |
534 | { | |
535 | prefix = ipa_from_u32(act->lsa.id & ln->optx); | |
536 | pxlen = u32_masklen(ln->optx); | |
537 | add_network(oa, prefix, pxlen, act->dist, act, -1); | |
538 | } | |
539 | ||
540 | cnt = lsa_net_count(&act->lsa); | |
541 | for (i = 0; i < cnt; i++) | |
542 | { | |
543 | tmp = ospf_hash_find_rt(p->gr, oa->areaid, ln->routers[i]); | |
544 | add_cand(&oa->cand, tmp, act, act->dist, oa, -1); | |
545 | } | |
546 | } | |
547 | ||
548 | static inline void | |
549 | spfa_process_prefixes(struct ospf_proto *p, struct ospf_area *oa) | |
b49e6f5a | 550 | { |
b49e6f5a OZ |
551 | struct top_hash_entry *en, *src; |
552 | struct ospf_lsa_prefix *px; | |
553 | ip_addr pxa; | |
554 | int pxlen; | |
555 | u8 pxopts; | |
556 | u16 metric; | |
557 | u32 *buf; | |
558 | int i; | |
559 | ||
70945cb6 | 560 | WALK_SLIST(en, p->lsal) |
b49e6f5a | 561 | { |
70945cb6 | 562 | if (en->lsa_type != LSA_T_PREFIX) |
b49e6f5a OZ |
563 | continue; |
564 | ||
565 | if (en->domain != oa->areaid) | |
566 | continue; | |
567 | ||
568 | if (en->lsa.age == LSA_MAXAGE) | |
569 | continue; | |
570 | ||
571 | px = en->lsa_body; | |
9f0ba7b1 OZ |
572 | |
573 | /* For router prefix-LSA, we would like to find the first router-LSA */ | |
574 | if (px->ref_type == LSA_T_RT) | |
70945cb6 | 575 | src = ospf_hash_find_rt(p->gr, oa->areaid, px->ref_rt); |
9f0ba7b1 | 576 | else |
70945cb6 | 577 | src = ospf_hash_find(p->gr, oa->areaid, px->ref_id, px->ref_rt, px->ref_type); |
b49e6f5a OZ |
578 | |
579 | if (!src) | |
580 | continue; | |
581 | ||
3b89a232 OZ |
582 | /* Reachable in SPF */ |
583 | if (src->color != INSPF) | |
584 | continue; | |
585 | ||
70945cb6 | 586 | if ((src->lsa_type != LSA_T_RT) && (src->lsa_type != LSA_T_NET)) |
b49e6f5a OZ |
587 | continue; |
588 | ||
589 | buf = px->rest; | |
590 | for (i = 0; i < px->pxcount; i++) | |
591 | { | |
b66abe8e | 592 | buf = lsa_get_ipv6_prefix(buf, &pxa, &pxlen, &pxopts, &metric); |
b49e6f5a OZ |
593 | |
594 | if (pxopts & OPT_PX_NU) | |
595 | continue; | |
596 | ||
3b89a232 OZ |
597 | /* Store the first global address to use it later as a vlink endpoint */ |
598 | if ((pxopts & OPT_PX_LA) && ipa_zero(src->lb)) | |
599 | src->lb = pxa; | |
600 | ||
e7b4948c | 601 | add_network(oa, pxa, pxlen, src->dist + metric, src, i); |
b49e6f5a OZ |
602 | } |
603 | } | |
604 | } | |
9f0ba7b1 | 605 | |
3b89a232 | 606 | /* RFC 2328 16.1. calculating shortest paths for an area */ |
1a61882d | 607 | static void |
a02c6c18 | 608 | ospf_rt_spfa(struct ospf_area *oa) |
dfa9a53a | 609 | { |
70945cb6 OZ |
610 | struct ospf_proto *p = oa->po; |
611 | struct top_hash_entry *act; | |
98ac6176 OF |
612 | node *n; |
613 | ||
2e10a170 OF |
614 | if (oa->rt == NULL) |
615 | return; | |
a7a7372a OZ |
616 | if (oa->rt->lsa.age == LSA_MAXAGE) |
617 | return; | |
102e3e0e | 618 | |
3aab39f5 | 619 | OSPF_TRACE(D_EVENTS, "Starting routing table calculation for area %R", oa->areaid); |
1a61882d | 620 | |
c3226991 | 621 | /* 16.1. (1) */ |
dfa9a53a | 622 | init_list(&oa->cand); /* Empty list of candidates */ |
2e10a170 | 623 | oa->trcap = 0; |
dfa9a53a | 624 | |
85195f1a OF |
625 | DBG("LSA db prepared, adding me into candidate list.\n"); |
626 | ||
2e10a170 OF |
627 | oa->rt->dist = 0; |
628 | oa->rt->color = CANDIDATE; | |
85195f1a | 629 | add_head(&oa->cand, &oa->rt->cn); |
3aab39f5 | 630 | DBG("RT LSA: rt: %R, id: %R, type: %u\n", |
70945cb6 | 631 | oa->rt->lsa.rt, oa->rt->lsa.id, oa->rt->lsa_type); |
dfa9a53a | 632 | |
2e10a170 | 633 | while (!EMPTY_LIST(oa->cand)) |
dfa9a53a | 634 | { |
2e10a170 OF |
635 | n = HEAD(oa->cand); |
636 | act = SKIP_BACK(struct top_hash_entry, cn, n); | |
dfa9a53a | 637 | rem_node(n); |
dfa9a53a | 638 | |
3aab39f5 | 639 | DBG("Working on LSA: rt: %R, id: %R, type: %u\n", |
70945cb6 | 640 | act->lsa.rt, act->lsa.id, act->lsa_type); |
85195f1a | 641 | |
2e10a170 | 642 | act->color = INSPF; |
70945cb6 | 643 | switch (act->lsa_type) |
dfa9a53a | 644 | { |
2e10a170 | 645 | case LSA_T_RT: |
70945cb6 | 646 | spfa_process_rt(p, oa, act); |
2e10a170 | 647 | break; |
b49e6f5a | 648 | |
70945cb6 OZ |
649 | case LSA_T_NET: |
650 | spfa_process_net(p, oa, act); | |
2e10a170 | 651 | break; |
70945cb6 OZ |
652 | |
653 | default: | |
654 | log(L_WARN "%s: Unknown LSA type in SPF: %d", p->p.name, act->lsa_type); | |
dfa9a53a | 655 | } |
d345cda5 | 656 | } |
98ac6176 | 657 | |
70945cb6 OZ |
658 | if (ospf_is_v3(p)) |
659 | spfa_process_prefixes(p, oa); | |
98ac6176 OF |
660 | } |
661 | ||
662 | static int | |
9807690b | 663 | link_back(struct ospf_area *oa, struct top_hash_entry *en, struct top_hash_entry *par) |
98ac6176 | 664 | { |
70945cb6 OZ |
665 | struct ospf_proto *p = oa->po; |
666 | struct ospf_lsa_rt_walk rtl; | |
9807690b | 667 | struct top_hash_entry *tmp; |
70945cb6 OZ |
668 | struct ospf_lsa_net *ln; |
669 | u32 i, cnt; | |
98ac6176 | 670 | |
9807690b OZ |
671 | if (!en || !par) return 0; |
672 | ||
39847cda OZ |
673 | /* We should check whether there is a link back from en to par, |
674 | this is used in SPF calc (RFC 2328 16.1. (2b)). According to RFC 2328 | |
675 | note 23, we don't have to find the same link that is used for par | |
676 | to en, any link is enough. This we do for ptp links. For net-rt | |
677 | links, we have to find the same link to compute proper lb/lb_id, | |
678 | which may be later used as the next hop. */ | |
679 | ||
3b89a232 | 680 | /* In OSPFv2, en->lb is set here. In OSPFv3, en->lb is just cleared here, |
c8cafc8e | 681 | it is set in process_prefixes() to any global address in the area */ |
3b89a232 | 682 | |
9807690b | 683 | en->lb = IPA_NONE; |
6e806760 | 684 | en->lb_id = 0; |
70945cb6 OZ |
685 | |
686 | switch (en->lsa_type) | |
98ac6176 | 687 | { |
70945cb6 OZ |
688 | case LSA_T_RT: |
689 | lsa_walk_rt_init(p, en, &rtl); | |
690 | while (lsa_walk_rt(&rtl)) | |
691 | { | |
692 | switch (rtl.type) | |
98ac6176 | 693 | { |
70945cb6 OZ |
694 | case LSART_STUB: |
695 | break; | |
696 | ||
697 | case LSART_NET: | |
698 | tmp = ospf_hash_find_net(p->gr, oa->areaid, rtl.id, rtl.nif); | |
699 | if (tmp == par) | |
98ac6176 | 700 | { |
70945cb6 OZ |
701 | if (ospf_is_v2(p)) |
702 | en->lb = ipa_from_u32(rtl.data); | |
703 | else | |
704 | en->lb_id = rtl.lif; | |
705 | ||
706 | return 1; | |
98ac6176 | 707 | } |
70945cb6 OZ |
708 | break; |
709 | ||
710 | case LSART_VLNK: | |
711 | case LSART_PTP: | |
712 | /* Not necessary the same link, see RFC 2328 [23] */ | |
713 | tmp = ospf_hash_find_rt(p->gr, oa->areaid, rtl.id); | |
9807690b | 714 | if (tmp == par) |
70945cb6 OZ |
715 | return 1; |
716 | break; | |
98ac6176 | 717 | } |
70945cb6 OZ |
718 | } |
719 | break; | |
720 | ||
721 | case LSA_T_NET: | |
722 | ln = en->lsa_body; | |
723 | cnt = lsa_net_count(&en->lsa); | |
724 | for (i = 0; i < cnt; i++) | |
725 | { | |
726 | tmp = ospf_hash_find_rt(p->gr, oa->areaid, ln->routers[i]); | |
727 | if (tmp == par) | |
728 | return 1; | |
729 | } | |
730 | break; | |
731 | ||
732 | default: | |
733 | log(L_WARN "%s: Unknown LSA type in SPF: %d", p->p.name, en->lsa_type); | |
98ac6176 OF |
734 | } |
735 | return 0; | |
736 | } | |
737 | ||
742029eb | 738 | |
3b89a232 | 739 | /* RFC 2328 16.2. calculating inter-area routes */ |
98ac6176 | 740 | static void |
3b89a232 | 741 | ospf_rt_sum(struct ospf_area *oa) |
98ac6176 | 742 | { |
70945cb6 | 743 | struct ospf_proto *p = oa->po; |
98ac6176 | 744 | struct top_hash_entry *en; |
70945cb6 OZ |
745 | ip_addr ip, abrip; |
746 | u32 dst_rid, metric, options; | |
3b89a232 | 747 | ort *abr; |
c3226991 | 748 | int pxlen = -1, type = -1; |
70945cb6 | 749 | u8 pxopts; |
742029eb | 750 | |
98ac6176 | 751 | |
3b89a232 | 752 | OSPF_TRACE(D_EVENTS, "Starting routing table calculation for inter-area (area %R)", oa->areaid); |
98ac6176 | 753 | |
70945cb6 | 754 | WALK_SLIST(en, p->lsal) |
98ac6176 | 755 | { |
70945cb6 | 756 | if ((en->lsa_type != LSA_T_SUM_RT) && (en->lsa_type != LSA_T_SUM_NET)) |
86c84d76 | 757 | continue; |
c3226991 OZ |
758 | |
759 | if (en->domain != oa->areaid) | |
760 | continue; | |
761 | ||
3b89a232 | 762 | /* 16.2. (1a) */ |
98ac6176 OF |
763 | if (en->lsa.age == LSA_MAXAGE) |
764 | continue; | |
c3226991 | 765 | |
3b89a232 | 766 | /* 16.2. (2) */ |
70945cb6 | 767 | if (en->lsa.rt == p->router_id) |
98ac6176 OF |
768 | continue; |
769 | ||
6384c7d7 | 770 | /* 16.2. (3) is handled later in ospf_rt_abr() by resetting such rt entry */ |
3b89a232 | 771 | |
70945cb6 | 772 | if (en->lsa_type == LSA_T_SUM_NET) |
98ac6176 | 773 | { |
70945cb6 | 774 | lsa_parse_sum_net(en, ospf_is_v2(p), &ip, &pxlen, &pxopts, &metric); |
b49e6f5a | 775 | |
c3226991 OZ |
776 | if (pxopts & OPT_PX_NU) |
777 | continue; | |
c3226991 | 778 | |
ab164971 OZ |
779 | if (pxlen < 0 || pxlen > MAX_PREFIX_LENGTH) |
780 | { | |
781 | log(L_WARN "%s: Invalid prefix in LSA (Type: %04x, Id: %R, Rt: %R)", | |
70945cb6 | 782 | p->p.name, en->lsa_type, en->lsa.id, en->lsa.rt); |
ab164971 OZ |
783 | continue; |
784 | } | |
785 | ||
c3226991 | 786 | options = 0; |
98ac6176 | 787 | type = ORT_NET; |
98ac6176 | 788 | } |
3b89a232 | 789 | else /* LSA_T_SUM_RT */ |
98ac6176 | 790 | { |
70945cb6 | 791 | lsa_parse_sum_rt(en, ospf_is_v2(p), &dst_rid, &metric, &options); |
742029eb | 792 | |
6384c7d7 | 793 | /* We don't want local router in ASBR routing table */ |
70945cb6 | 794 | if (dst_rid == p->router_id) |
6384c7d7 | 795 | continue; |
c3226991 | 796 | |
c3226991 | 797 | options |= ORTA_ASBR; |
98ac6176 | 798 | type = ORT_ROUTER; |
98ac6176 | 799 | } |
c3226991 | 800 | |
3b89a232 OZ |
801 | /* 16.2. (1b) */ |
802 | if (metric == LSINFINITY) | |
803 | continue; | |
99f5fc14 | 804 | |
3b89a232 | 805 | /* 16.2. (4) */ |
70945cb6 | 806 | abrip = ipa_from_rid(en->lsa.rt); |
3b89a232 OZ |
807 | abr = (ort *) fib_find(&oa->rtr, &abrip, MAX_PREFIX_LENGTH); |
808 | if (!abr || !abr->n.type) | |
809 | continue; | |
98ac6176 | 810 | |
3b89a232 OZ |
811 | if (!(abr->n.options & ORTA_ABR)) |
812 | continue; | |
813 | ||
0ea8fb4a OZ |
814 | /* This check is not mentioned in RFC 2328 */ |
815 | if (abr->n.type != RTS_OSPF) | |
816 | continue; | |
817 | ||
3b89a232 OZ |
818 | /* 16.2. (5) */ |
819 | orta nf = { | |
820 | .type = RTS_OSPF_IA, | |
821 | .options = options, | |
822 | .metric1 = abr->n.metric1 + metric, | |
823 | .metric2 = LSINFINITY, | |
824 | .tag = 0, | |
825 | .rid = en->lsa.rt, /* ABR ID */ | |
826 | .oa = oa, | |
57c574d8 | 827 | .nhs = abr->n.nhs |
3b89a232 OZ |
828 | }; |
829 | ||
830 | if (type == ORT_NET) | |
70945cb6 | 831 | ri_install_net(p, ip, pxlen, &nf); |
3b89a232 OZ |
832 | else |
833 | ri_install_rt(oa, dst_rid, &nf); | |
98ac6176 | 834 | } |
fafe44b6 | 835 | } |
3b89a232 OZ |
836 | |
837 | /* RFC 2328 16.3. examining summary-LSAs in transit areas */ | |
98ac6176 | 838 | static void |
3b89a232 | 839 | ospf_rt_sum_tr(struct ospf_area *oa) |
98ac6176 | 840 | { |
70945cb6 OZ |
841 | struct ospf_proto *p = oa->po; |
842 | struct ospf_area *bb = p->backbone; | |
98ac6176 | 843 | struct top_hash_entry *en; |
70945cb6 OZ |
844 | ort *re, *abr; |
845 | ip_addr ip, abrip; | |
846 | u32 dst_rid, metric, options; | |
847 | int pxlen; | |
848 | u8 pxopts; | |
fafe44b6 | 849 | |
3b89a232 | 850 | |
70945cb6 OZ |
851 | if (!bb) |
852 | return; | |
b8f17cf1 | 853 | |
70945cb6 | 854 | WALK_SLIST(en, p->lsal) |
98ac6176 | 855 | { |
70945cb6 | 856 | if ((en->lsa_type != LSA_T_SUM_RT) && (en->lsa_type != LSA_T_SUM_NET)) |
c3226991 OZ |
857 | continue; |
858 | ||
859 | if (en->domain != oa->areaid) | |
86c84d76 | 860 | continue; |
c3226991 | 861 | |
3b89a232 | 862 | /* 16.3 (1a) */ |
98ac6176 OF |
863 | if (en->lsa.age == LSA_MAXAGE) |
864 | continue; | |
c3226991 | 865 | |
3b89a232 | 866 | /* 16.3 (2) */ |
70945cb6 | 867 | if (en->lsa.rt == p->router_id) |
98ac6176 OF |
868 | continue; |
869 | ||
70945cb6 | 870 | if (en->lsa_type == LSA_T_SUM_NET) |
98ac6176 | 871 | { |
70945cb6 | 872 | lsa_parse_sum_net(en, ospf_is_v2(p), &ip, &pxlen, &pxopts, &metric); |
b49e6f5a | 873 | |
c3226991 OZ |
874 | if (pxopts & OPT_PX_NU) |
875 | continue; | |
c3226991 | 876 | |
ab164971 OZ |
877 | if (pxlen < 0 || pxlen > MAX_PREFIX_LENGTH) |
878 | { | |
879 | log(L_WARN "%s: Invalid prefix in LSA (Type: %04x, Id: %R, Rt: %R)", | |
70945cb6 | 880 | p->p.name, en->lsa_type, en->lsa.id, en->lsa.rt); |
ab164971 OZ |
881 | continue; |
882 | } | |
883 | ||
70945cb6 | 884 | re = fib_find(&p->rtf, &ip, pxlen); |
98ac6176 | 885 | } |
70945cb6 | 886 | else // en->lsa_type == LSA_T_SUM_RT |
98ac6176 | 887 | { |
70945cb6 OZ |
888 | lsa_parse_sum_rt(en, ospf_is_v2(p), &dst_rid, &metric, &options); |
889 | ||
890 | ip = ipa_from_rid(dst_rid); | |
6384c7d7 | 891 | re = fib_find(&bb->rtr, &ip, MAX_PREFIX_LENGTH); |
98ac6176 | 892 | } |
98ac6176 | 893 | |
742029eb OZ |
894 | /* 16.3 (1b) */ |
895 | if (metric == LSINFINITY) | |
896 | continue; | |
1a61882d | 897 | |
3b89a232 OZ |
898 | /* 16.3 (3) */ |
899 | if (!re || !re->n.type) | |
900 | continue; | |
86c84d76 | 901 | |
3b89a232 OZ |
902 | if (re->n.oa->areaid != 0) |
903 | continue; | |
1a61882d | 904 | |
3b89a232 OZ |
905 | if ((re->n.type != RTS_OSPF) && (re->n.type != RTS_OSPF_IA)) |
906 | continue; | |
1a61882d | 907 | |
3b89a232 OZ |
908 | /* 16.3. (4) */ |
909 | abrip = ipa_from_rid(en->lsa.rt); | |
910 | abr = fib_find(&oa->rtr, &abrip, MAX_PREFIX_LENGTH); | |
911 | if (!abr || !abr->n.type) | |
912 | continue; | |
1a61882d | 913 | |
3b89a232 | 914 | metric = abr->n.metric1 + metric; /* IAC */ |
98ac6176 | 915 | |
3b89a232 | 916 | /* 16.3. (5) */ |
742029eb | 917 | if ((metric < re->n.metric1) || |
145368f5 | 918 | ((metric == re->n.metric1) && unresolved_vlink(re))) |
98ac6176 | 919 | { |
3b89a232 | 920 | /* We want to replace the next-hop even if the metric is equal |
57c574d8 OZ |
921 | to replace a virtual next-hop through vlink with a real one. |
922 | Proper ECMP would merge nexthops here, but we do not do that. | |
923 | We restrict nexthops to fit one area to simplify check | |
924 | 12.4.3 p4 in decide_sum_lsa() */ | |
925 | ||
3b89a232 | 926 | re->n.metric1 = metric; |
57c574d8 OZ |
927 | re->n.voa = oa; |
928 | re->n.nhs = abr->n.nhs; | |
98ac6176 | 929 | } |
98ac6176 | 930 | } |
3b89a232 | 931 | } |
1a61882d | 932 | |
c8cafc8e | 933 | /* Decide about originating or flushing summary LSAs for condensed area networks */ |
6384c7d7 OZ |
934 | static int |
935 | decide_anet_lsa(struct ospf_area *oa, struct area_net *anet, struct ospf_area *anet_oa) | |
936 | { | |
41b612c3 OZ |
937 | /* 12.4.3.1. - for stub/NSSA areas, originating summary routes is configurable */ |
938 | if (!oa_is_ext(oa) && !oa->ac->summary) | |
6384c7d7 OZ |
939 | return 0; |
940 | ||
941 | if (oa == anet_oa) | |
942 | return 0; | |
943 | ||
944 | /* Do not condense routing info when exporting from backbone to the transit area */ | |
945 | if ((anet_oa == oa->po->backbone) && oa->trcap) | |
946 | return 0; | |
947 | ||
948 | return (anet->active && !anet->hidden); | |
949 | } | |
950 | ||
951 | /* Decide about originating or flushing summary LSAs (12.4.3) */ | |
952 | static int | |
953 | decide_sum_lsa(struct ospf_area *oa, ort *nf, int dest) | |
954 | { | |
41b612c3 OZ |
955 | /* 12.4.3.1. - for stub/NSSA areas, originating summary routes is configurable */ |
956 | if (!oa_is_ext(oa) && !oa->ac->summary) | |
6384c7d7 OZ |
957 | return 0; |
958 | ||
959 | /* Invalid field - no route */ | |
960 | if (!nf->n.type) | |
961 | return 0; | |
962 | ||
963 | /* 12.4.3 p2 */ | |
964 | if (nf->n.type > RTS_OSPF_IA) | |
965 | return 0; | |
966 | ||
967 | /* 12.4.3 p3 */ | |
968 | if ((nf->n.oa->areaid == oa->areaid)) | |
969 | return 0; | |
970 | ||
971 | /* 12.4.3 p4 */ | |
57c574d8 | 972 | if (nf->n.voa && (nf->n.voa->areaid == oa->areaid)) |
6384c7d7 OZ |
973 | return 0; |
974 | ||
975 | /* 12.4.3 p5 */ | |
976 | if (nf->n.metric1 >= LSINFINITY) | |
977 | return 0; | |
978 | ||
979 | /* 12.4.3 p6 - AS boundary router */ | |
980 | if (dest == ORT_ROUTER) | |
981 | { | |
982 | /* We call decide_sum_lsa() on preferred ASBR entries, no need for 16.4. (3) */ | |
983 | /* 12.4.3 p1 */ | |
41b612c3 | 984 | return oa_is_ext(oa) && (nf->n.options & ORTA_ASBR); |
6384c7d7 OZ |
985 | } |
986 | ||
987 | /* 12.4.3 p7 - inter-area route */ | |
988 | if (nf->n.type == RTS_OSPF_IA) | |
989 | { | |
990 | /* Inter-area routes are not repropagated into the backbone */ | |
991 | return (oa != oa->po->backbone); | |
992 | } | |
993 | ||
994 | /* 12.4.3 p8 - intra-area route */ | |
995 | ||
996 | /* Do not condense routing info when exporting from backbone to the transit area */ | |
997 | if ((nf->n.oa == oa->po->backbone) && oa->trcap) | |
998 | return 1; | |
999 | ||
1000 | struct area_net *anet = (struct area_net *) | |
1001 | fib_route(&nf->n.oa->net_fib, nf->fn.prefix, nf->fn.pxlen); | |
1002 | ||
742029eb | 1003 | /* Condensed area network found */ |
6384c7d7 OZ |
1004 | if (anet) |
1005 | return 0; | |
1006 | ||
1007 | return 1; | |
1008 | } | |
1009 | ||
1010 | /* RFC 2328 16.7. p1 - originate or flush summary LSAs */ | |
1011 | static inline void | |
70945cb6 | 1012 | check_sum_net_lsa(struct ospf_proto *p, ort *nf) |
6384c7d7 OZ |
1013 | { |
1014 | struct area_net *anet = NULL; | |
9b061f7e | 1015 | struct ospf_area *anet_oa = NULL; |
6384c7d7 | 1016 | |
a7a7372a | 1017 | if (nf->area_net) |
6384c7d7 OZ |
1018 | { |
1019 | /* It is a default route for stub areas, handled entirely in ospf_rt_abr() */ | |
1020 | if (nf->fn.pxlen == 0) | |
1021 | return; | |
1022 | ||
1023 | /* Find that area network */ | |
70945cb6 | 1024 | WALK_LIST(anet_oa, p->area_list) |
6384c7d7 OZ |
1025 | { |
1026 | anet = (struct area_net *) fib_find(&anet_oa->net_fib, &nf->fn.prefix, nf->fn.pxlen); | |
1027 | if (anet) | |
1028 | break; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | struct ospf_area *oa; | |
70945cb6 | 1033 | WALK_LIST(oa, p->area_list) |
6384c7d7 OZ |
1034 | { |
1035 | if (anet && decide_anet_lsa(oa, anet, anet_oa)) | |
70945cb6 | 1036 | ospf_originate_sum_net_lsa(p, oa, nf, anet->metric); |
6384c7d7 | 1037 | else if (decide_sum_lsa(oa, nf, ORT_NET)) |
70945cb6 | 1038 | ospf_originate_sum_net_lsa(p, oa, nf, nf->n.metric1); |
6384c7d7 OZ |
1039 | } |
1040 | } | |
1041 | ||
1042 | static inline void | |
70945cb6 | 1043 | check_sum_rt_lsa(struct ospf_proto *p, ort *nf) |
6384c7d7 OZ |
1044 | { |
1045 | struct ospf_area *oa; | |
70945cb6 | 1046 | WALK_LIST(oa, p->area_list) |
6384c7d7 | 1047 | if (decide_sum_lsa(oa, nf, ORT_ROUTER)) |
70945cb6 | 1048 | ospf_originate_sum_rt_lsa(p, oa, nf, nf->n.metric1, nf->n.options); |
6384c7d7 OZ |
1049 | } |
1050 | ||
ed317862 | 1051 | static inline int |
3e236955 | 1052 | decide_nssa_lsa(struct ospf_proto *p UNUSED4 UNUSED6, ort *nf, struct ospf_lsa_ext_local *rt) |
ed317862 OZ |
1053 | { |
1054 | struct ospf_area *oa = nf->n.oa; | |
1055 | struct top_hash_entry *en = nf->n.en; | |
ed317862 OZ |
1056 | |
1057 | if (!rt_is_nssa(nf) || !oa->translate) | |
1058 | return 0; | |
1059 | ||
742029eb | 1060 | /* Condensed area network found */ |
ed317862 OZ |
1061 | if (fib_route(&oa->enet_fib, nf->fn.prefix, nf->fn.pxlen)) |
1062 | return 0; | |
1063 | ||
70945cb6 | 1064 | if (!en || (en->lsa_type != LSA_T_NSSA)) |
ed317862 OZ |
1065 | return 0; |
1066 | ||
1067 | /* We do not store needed data in struct orta, we have to parse the LSA */ | |
70945cb6 | 1068 | lsa_parse_ext(en, ospf_is_v2(p), rt); |
742029eb | 1069 | |
70945cb6 | 1070 | if (rt->pxopts & OPT_PX_NU) |
ed317862 OZ |
1071 | return 0; |
1072 | ||
70945cb6 | 1073 | if (!rt->propagate || ipa_zero(rt->fwaddr)) |
ed317862 OZ |
1074 | return 0; |
1075 | ||
ed317862 OZ |
1076 | return 1; |
1077 | } | |
1078 | ||
1079 | /* RFC 3103 3.2 - translating Type-7 LSAs into Type-5 LSAs */ | |
1080 | static inline void | |
70945cb6 | 1081 | check_nssa_lsa(struct ospf_proto *p, ort *nf) |
ed317862 | 1082 | { |
ed317862 OZ |
1083 | struct area_net *anet = NULL; |
1084 | struct ospf_area *oa = NULL; | |
70945cb6 | 1085 | struct ospf_lsa_ext_local rt; |
ed317862 OZ |
1086 | |
1087 | /* Do not translate LSA if there is already the external LSA from route export */ | |
70945cb6 | 1088 | if (nf->external_rte) |
ed317862 OZ |
1089 | return; |
1090 | ||
a7a7372a | 1091 | if (nf->area_net) |
ed317862 OZ |
1092 | { |
1093 | /* Find that area network */ | |
70945cb6 | 1094 | WALK_LIST(oa, p->area_list) |
ed317862 | 1095 | { |
70945cb6 | 1096 | anet = (struct area_net *) fib_find(&oa->enet_fib, &nf->fn.prefix, nf->fn.pxlen); |
ed317862 OZ |
1097 | if (anet) |
1098 | break; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | /* RFC 3103 3.2 (3) - originate the aggregated address range */ | |
1103 | if (anet && anet->active && !anet->hidden && oa->translate) | |
a7a7372a | 1104 | ospf_originate_ext_lsa(p, NULL, nf, LSA_M_RTCALC, anet->metric, |
70945cb6 | 1105 | (anet->metric & LSA_EXT3_EBIT), IPA_NONE, anet->tag, 0); |
ed317862 OZ |
1106 | |
1107 | /* RFC 3103 3.2 (2) - originate the same network */ | |
70945cb6 | 1108 | else if (decide_nssa_lsa(p, nf, &rt)) |
a7a7372a | 1109 | ospf_originate_ext_lsa(p, NULL, nf, LSA_M_RTCALC, rt.metric, rt.ebit, rt.fwaddr, rt.tag, 0); |
ed317862 | 1110 | } |
6384c7d7 OZ |
1111 | |
1112 | /* RFC 2328 16.7. p2 - find new/lost vlink endpoints */ | |
3b89a232 | 1113 | static void |
70945cb6 | 1114 | ospf_check_vlinks(struct ospf_proto *p) |
3b89a232 | 1115 | { |
48e5f32d | 1116 | struct ospf_iface *ifa; |
70945cb6 | 1117 | WALK_LIST(ifa, p->iface_list) |
6384c7d7 | 1118 | { |
48e5f32d | 1119 | if (ifa->type == OSPF_IT_VLINK) |
6384c7d7 OZ |
1120 | { |
1121 | struct top_hash_entry *tmp; | |
70945cb6 | 1122 | tmp = ospf_hash_find_rt(p->gr, ifa->voa->areaid, ifa->vid); |
6384c7d7 | 1123 | |
57c574d8 | 1124 | if (tmp && (tmp->color == INSPF) && ipa_nonzero(tmp->lb) && tmp->nhs) |
6384c7d7 | 1125 | { |
70945cb6 | 1126 | struct ospf_iface *nhi = ospf_iface_find(p, tmp->nhs->iface); |
57c574d8 | 1127 | |
742029eb | 1128 | if ((ifa->state != OSPF_IS_PTP) |
48e5f32d OZ |
1129 | || (ifa->vifa != nhi) |
1130 | || !ipa_equal(ifa->vip, tmp->lb)) | |
742029eb | 1131 | { |
f8fefde3 | 1132 | OSPF_TRACE(D_EVENTS, "Vlink peer %R found", ifa->vid); |
742029eb | 1133 | ospf_iface_sm(ifa, ISM_DOWN); |
48e5f32d OZ |
1134 | ifa->vifa = nhi; |
1135 | ifa->addr = nhi->addr; | |
1136 | ifa->cost = tmp->dist; | |
742029eb OZ |
1137 | ifa->vip = tmp->lb; |
1138 | ospf_iface_sm(ifa, ISM_UP); | |
1139 | } | |
48e5f32d | 1140 | else if ((ifa->state == OSPF_IS_PTP) && (ifa->cost != tmp->dist)) |
6384c7d7 | 1141 | { |
48e5f32d | 1142 | ifa->cost = tmp->dist; |
70945cb6 OZ |
1143 | |
1144 | /* RFC 2328 12.4 Event 8 - vlink state change */ | |
1145 | ospf_notify_rt_lsa(ifa->oa); | |
6384c7d7 OZ |
1146 | } |
1147 | } | |
1148 | else | |
1149 | { | |
742029eb OZ |
1150 | if (ifa->state > OSPF_IS_DOWN) |
1151 | { | |
1152 | OSPF_TRACE(D_EVENTS, "Vlink peer %R lost", ifa->vid); | |
48e5f32d | 1153 | ospf_iface_sm(ifa, ISM_DOWN); |
742029eb | 1154 | } |
6384c7d7 OZ |
1155 | } |
1156 | } | |
1157 | } | |
1158 | } | |
1159 | ||
4160a9dd | 1160 | |
6384c7d7 OZ |
1161 | /* Miscellaneous route processing that needs to be done by ABRs */ |
1162 | static void | |
70945cb6 | 1163 | ospf_rt_abr1(struct ospf_proto *p) |
6384c7d7 OZ |
1164 | { |
1165 | struct area_net *anet; | |
ed317862 | 1166 | ort *nf, *default_nf; |
6384c7d7 | 1167 | |
145368f5 | 1168 | /* RFC 2328 G.3 - incomplete resolution of virtual next hops - routers */ |
70945cb6 | 1169 | FIB_WALK(&p->backbone->rtr, nftmp) |
145368f5 OZ |
1170 | { |
1171 | nf = (ort *) nftmp; | |
1172 | ||
1173 | if (nf->n.type && unresolved_vlink(nf)) | |
1174 | reset_ri(nf); | |
1175 | } | |
1176 | FIB_WALK_END; | |
1177 | ||
1178 | ||
70945cb6 | 1179 | FIB_WALK(&p->rtf, nftmp) |
98ac6176 | 1180 | { |
6384c7d7 OZ |
1181 | nf = (ort *) nftmp; |
1182 | ||
1183 | ||
145368f5 OZ |
1184 | /* RFC 2328 G.3 - incomplete resolution of virtual next hops - networks */ |
1185 | if (nf->n.type && unresolved_vlink(nf)) | |
57c574d8 | 1186 | reset_ri(nf); |
6384c7d7 OZ |
1187 | |
1188 | ||
1189 | /* Compute condensed area networks */ | |
1190 | if (nf->n.type == RTS_OSPF) | |
1191 | { | |
1192 | anet = (struct area_net *) fib_route(&nf->n.oa->net_fib, nf->fn.prefix, nf->fn.pxlen); | |
1193 | if (anet) | |
1194 | { | |
1195 | if (!anet->active) | |
1196 | { | |
1197 | anet->active = 1; | |
1198 | ||
1199 | /* Get a RT entry and mark it to know that it is an area network */ | |
70945cb6 | 1200 | ort *nfi = (ort *) fib_get(&p->rtf, &anet->fn.prefix, anet->fn.pxlen); |
a7a7372a | 1201 | nfi->area_net = 1; |
6384c7d7 OZ |
1202 | |
1203 | /* 16.2. (3) */ | |
1204 | if (nfi->n.type == RTS_OSPF_IA) | |
57c574d8 | 1205 | reset_ri(nfi); |
6384c7d7 OZ |
1206 | } |
1207 | ||
1208 | if (anet->metric < nf->n.metric1) | |
1209 | anet->metric = nf->n.metric1; | |
1210 | } | |
1211 | } | |
1212 | } | |
1213 | FIB_WALK_END; | |
1214 | ||
1215 | ip_addr addr = IPA_NONE; | |
70945cb6 | 1216 | default_nf = (ort *) fib_get(&p->rtf, &addr, 0); |
a7a7372a | 1217 | default_nf->area_net = 1; |
6384c7d7 OZ |
1218 | |
1219 | struct ospf_area *oa; | |
70945cb6 | 1220 | WALK_LIST(oa, p->area_list) |
6384c7d7 OZ |
1221 | { |
1222 | ||
41b612c3 OZ |
1223 | /* 12.4.3.1. - originate or flush default route for stub/NSSA areas */ |
1224 | if (oa_is_stub(oa) || (oa_is_nssa(oa) && !oa->ac->summary)) | |
70945cb6 | 1225 | ospf_originate_sum_net_lsa(p, oa, default_nf, oa->ac->default_cost); |
6384c7d7 | 1226 | |
2918e610 OZ |
1227 | /* |
1228 | * Originate type-7 default route for NSSA areas | |
1229 | * | |
1230 | * Because type-7 default LSAs are originated by ABRs, they do not | |
1231 | * collide with other type-7 LSAs (as ABRs generate type-5 LSAs | |
1232 | * for both external route export or external-NSSA translation), | |
1233 | * so we use 0 for the src arg. | |
1234 | */ | |
1235 | ||
1236 | if (oa_is_nssa(oa) && oa->ac->default_nssa) | |
a7a7372a | 1237 | ospf_originate_ext_lsa(p, oa, default_nf, LSA_M_RTCALC, oa->ac->default_cost, |
70945cb6 | 1238 | (oa->ac->default_cost & LSA_EXT3_EBIT), IPA_NONE, 0, 0); |
6384c7d7 OZ |
1239 | |
1240 | /* RFC 2328 16.4. (3) - precompute preferred ASBR entries */ | |
41b612c3 | 1241 | if (oa_is_ext(oa)) |
6384c7d7 | 1242 | { |
41b612c3 OZ |
1243 | FIB_WALK(&oa->rtr, nftmp) |
1244 | { | |
1245 | nf = (ort *) nftmp; | |
1246 | if (nf->n.options & ORTA_ASBR) | |
70945cb6 | 1247 | ri_install_asbr(p, &nf->fn.prefix, &nf->n); |
41b612c3 OZ |
1248 | } |
1249 | FIB_WALK_END; | |
6384c7d7 | 1250 | } |
6384c7d7 OZ |
1251 | } |
1252 | ||
1253 | ||
ed317862 | 1254 | /* Originate or flush ASBR summary LSAs */ |
70945cb6 | 1255 | FIB_WALK(&p->backbone->rtr, nftmp) |
ed317862 | 1256 | { |
70945cb6 | 1257 | check_sum_rt_lsa(p, (ort *) nftmp); |
ed317862 OZ |
1258 | } |
1259 | FIB_WALK_END; | |
1260 | ||
1261 | ||
1262 | /* RFC 2328 16.7. p2 - find new/lost vlink endpoints */ | |
70945cb6 | 1263 | ospf_check_vlinks(p); |
ed317862 OZ |
1264 | } |
1265 | ||
1266 | ||
1267 | static void | |
1268 | translator_timer_hook(timer *timer) | |
1269 | { | |
1270 | struct ospf_area *oa = timer->data; | |
742029eb | 1271 | |
ed317862 OZ |
1272 | if (oa->translate != TRANS_WAIT) |
1273 | return; | |
1274 | ||
1275 | oa->translate = TRANS_OFF; | |
a7a7372a | 1276 | ospf_schedule_rtcalc(oa->po); |
ed317862 OZ |
1277 | } |
1278 | ||
1279 | static void | |
70945cb6 | 1280 | ospf_rt_abr2(struct ospf_proto *p) |
ed317862 OZ |
1281 | { |
1282 | struct ospf_area *oa; | |
1283 | struct top_hash_entry *en; | |
1284 | ort *nf, *nf2; | |
1285 | ||
1286 | ||
4160a9dd | 1287 | /* RFC 3103 3.1 - type-7 translator election */ |
70945cb6 OZ |
1288 | struct ospf_area *bb = p->backbone; |
1289 | WALK_LIST(oa, p->area_list) | |
4160a9dd OZ |
1290 | if (oa_is_nssa(oa)) |
1291 | { | |
1292 | int translate = 1; | |
1293 | ||
1294 | if (oa->ac->translator) | |
1295 | goto decided; | |
1296 | ||
1297 | FIB_WALK(&oa->rtr, nftmp) | |
1298 | { | |
1299 | nf = (ort *) nftmp; | |
1300 | if (!nf->n.type || !(nf->n.options & ORTA_ABR)) | |
1301 | continue; | |
1302 | ||
1303 | nf2 = fib_find(&bb->rtr, &nf->fn.prefix, MAX_PREFIX_LENGTH); | |
1304 | if (!nf2 || !nf2->n.type || !(nf2->n.options & ORTA_ABR)) | |
1305 | continue; | |
1306 | ||
70945cb6 | 1307 | en = ospf_hash_find_rt(p->gr, oa->areaid, nf->n.rid); |
4160a9dd OZ |
1308 | if (!en || (en->color != INSPF)) |
1309 | continue; | |
1310 | ||
1311 | struct ospf_lsa_rt *rt = en->lsa_body; | |
1312 | /* There is better candidate - Nt-bit or higher Router ID */ | |
70945cb6 | 1313 | if ((rt->options & OPT_RT_NT) || (p->router_id < nf->n.rid)) |
4160a9dd OZ |
1314 | { |
1315 | translate = 0; | |
1316 | goto decided; | |
4160a9dd OZ |
1317 | } |
1318 | } | |
1319 | FIB_WALK_END; | |
1320 | ||
1321 | decided: | |
1322 | if (translate && (oa->translate != TRANS_ON)) | |
1323 | { | |
1324 | if (oa->translate == TRANS_WAIT) | |
1325 | tm_stop(oa->translator_timer); | |
1326 | ||
1327 | oa->translate = TRANS_ON; | |
1328 | } | |
1329 | ||
1330 | if (!translate && (oa->translate == TRANS_ON)) | |
1331 | { | |
1332 | if (oa->translator_timer == NULL) | |
70945cb6 | 1333 | oa->translator_timer = tm_new_set(p->p.pool, translator_timer_hook, oa, 0, 0); |
4160a9dd OZ |
1334 | |
1335 | /* Schedule the end of translation */ | |
1336 | tm_start(oa->translator_timer, oa->ac->transint); | |
1337 | oa->translate = TRANS_WAIT; | |
1338 | } | |
1339 | } | |
1340 | ||
1341 | ||
ed317862 | 1342 | /* Compute condensed external networks */ |
70945cb6 | 1343 | FIB_WALK(&p->rtf, nftmp) |
6384c7d7 | 1344 | { |
ed317862 | 1345 | nf = (ort *) nftmp; |
2918e610 | 1346 | if (rt_is_nssa(nf) && (nf->n.options & ORTA_PROP)) |
ed317862 OZ |
1347 | { |
1348 | struct area_net *anet = (struct area_net *) | |
1349 | fib_route(&nf->n.oa->enet_fib, nf->fn.prefix, nf->fn.pxlen); | |
1350 | ||
1351 | if (anet) | |
1352 | { | |
1353 | if (!anet->active) | |
1354 | { | |
1355 | anet->active = 1; | |
1356 | ||
1357 | /* Get a RT entry and mark it to know that it is an area network */ | |
70945cb6 | 1358 | nf2 = (ort *) fib_get(&p->rtf, &anet->fn.prefix, anet->fn.pxlen); |
a7a7372a | 1359 | nf2->area_net = 1; |
ed317862 OZ |
1360 | } |
1361 | ||
1362 | u32 metric = (nf->n.type == RTS_OSPF_EXT1) ? | |
70945cb6 | 1363 | nf->n.metric1 : ((nf->n.metric2 + 1) | LSA_EXT3_EBIT); |
ed317862 OZ |
1364 | |
1365 | if (anet->metric < metric) | |
1366 | anet->metric = metric; | |
1367 | } | |
1368 | } | |
1a61882d | 1369 | } |
3b89a232 | 1370 | FIB_WALK_END; |
6384c7d7 OZ |
1371 | |
1372 | ||
70945cb6 | 1373 | FIB_WALK(&p->rtf, nftmp) |
ed317862 OZ |
1374 | { |
1375 | nf = (ort *) nftmp; | |
1376 | ||
70945cb6 OZ |
1377 | check_sum_net_lsa(p, nf); |
1378 | check_nssa_lsa(p, nf); | |
ed317862 OZ |
1379 | } |
1380 | FIB_WALK_END; | |
b8f17cf1 OF |
1381 | } |
1382 | ||
ed317862 | 1383 | |
54818e9b OZ |
1384 | /* Like fib_route(), but ignores dummy rt entries */ |
1385 | static void * | |
1386 | ospf_fib_route(struct fib *f, ip_addr a, int len) | |
1387 | { | |
1388 | ip_addr a0; | |
1389 | ort *nf; | |
1390 | ||
1391 | while (len >= 0) | |
1392 | { | |
1393 | a0 = ipa_and(a, ipa_mkmask(len)); | |
1394 | nf = fib_find(f, &a0, len); | |
1395 | if (nf && nf->n.type) | |
1396 | return nf; | |
1397 | len--; | |
1398 | } | |
1399 | return NULL; | |
1400 | } | |
6384c7d7 OZ |
1401 | |
1402 | /* RFC 2328 16.4. calculating external routes */ | |
b8f17cf1 | 1403 | static void |
70945cb6 | 1404 | ospf_ext_spf(struct ospf_proto *p) |
fafe44b6 | 1405 | { |
70945cb6 OZ |
1406 | struct top_hash_entry *en; |
1407 | struct ospf_lsa_ext_local rt; | |
3b89a232 | 1408 | ort *nf1, *nf2; |
145368f5 | 1409 | orta nfa = {}; |
70945cb6 OZ |
1410 | ip_addr rtid; |
1411 | u32 br_metric; | |
98ac6176 | 1412 | struct ospf_area *atmp; |
aa1e082c | 1413 | |
1a61882d | 1414 | OSPF_TRACE(D_EVENTS, "Starting routing table calculation for ext routes"); |
aa1e082c | 1415 | |
70945cb6 | 1416 | WALK_SLIST(en, p->lsal) |
aa1e082c | 1417 | { |
c3226991 | 1418 | /* 16.4. (1) */ |
70945cb6 | 1419 | if ((en->lsa_type != LSA_T_EXT) && (en->lsa_type != LSA_T_NSSA)) |
2e10a170 | 1420 | continue; |
3b89a232 | 1421 | |
2e10a170 OF |
1422 | if (en->lsa.age == LSA_MAXAGE) |
1423 | continue; | |
c3226991 OZ |
1424 | |
1425 | /* 16.4. (2) */ | |
70945cb6 | 1426 | if (en->lsa.rt == p->router_id) |
2e10a170 | 1427 | continue; |
aa1e082c | 1428 | |
f9c799a0 | 1429 | DBG("%s: Working on LSA. ID: %R, RT: %R, Type: %u\n", |
70945cb6 | 1430 | p->p.name, en->lsa.id, en->lsa.rt, en->lsa_type); |
273fd2c1 | 1431 | |
70945cb6 | 1432 | lsa_parse_ext(en, ospf_is_v2(p), &rt); |
c3226991 | 1433 | |
70945cb6 | 1434 | if (rt.metric == LSINFINITY) |
2e10a170 | 1435 | continue; |
c3226991 | 1436 | |
70945cb6 | 1437 | if (rt.pxopts & OPT_PX_NU) |
c3226991 OZ |
1438 | continue; |
1439 | ||
70945cb6 | 1440 | if (rt.pxlen < 0 || rt.pxlen > MAX_PREFIX_LENGTH) |
508c36ab | 1441 | { |
ab164971 | 1442 | log(L_WARN "%s: Invalid prefix in LSA (Type: %04x, Id: %R, Rt: %R)", |
70945cb6 | 1443 | p->p.name, en->lsa_type, en->lsa.id, en->lsa.rt); |
4ee21789 | 1444 | continue; |
508c36ab | 1445 | } |
aa1e082c | 1446 | |
41b612c3 | 1447 | |
c3226991 | 1448 | /* 16.4. (3) */ |
41b612c3 | 1449 | /* If there are more areas, we already precomputed preferred ASBR |
ed317862 | 1450 | entries in ospf_rt_abr1() and stored them in the backbone |
41b612c3 | 1451 | table. For NSSA, we examine the area to which the LSA is assigned */ |
70945cb6 OZ |
1452 | if (en->lsa_type == LSA_T_EXT) |
1453 | atmp = ospf_main_area(p); | |
41b612c3 | 1454 | else /* NSSA */ |
70945cb6 | 1455 | atmp = ospf_find_area(p, en->domain); |
41b612c3 OZ |
1456 | |
1457 | if (!atmp) | |
1458 | continue; /* Should not happen */ | |
1459 | ||
c3226991 | 1460 | rtid = ipa_from_rid(en->lsa.rt); |
6384c7d7 | 1461 | nf1 = fib_find(&atmp->rtr, &rtid, MAX_PREFIX_LENGTH); |
3b89a232 | 1462 | |
6384c7d7 | 1463 | if (!nf1 || !nf1->n.type) |
1a61882d | 1464 | continue; /* No AS boundary router found */ |
aa1e082c | 1465 | |
c3226991 | 1466 | if (!(nf1->n.options & ORTA_ASBR)) |
1a61882d | 1467 | continue; /* It is not ASBR */ |
508c36ab | 1468 | |
41b612c3 OZ |
1469 | /* 16.4. (3) NSSA - special rule for default routes */ |
1470 | /* ABR should use default only if P-bit is set and summaries are active */ | |
70945cb6 OZ |
1471 | if ((en->lsa_type == LSA_T_NSSA) && ipa_zero(rt.ip) && (rt.pxlen == 0) && |
1472 | (p->areano > 1) && !(rt.propagate && atmp->ac->summary)) | |
41b612c3 OZ |
1473 | continue; |
1474 | ||
70945cb6 | 1475 | if (!rt.fbit) |
aa1e082c | 1476 | { |
3b89a232 | 1477 | nf2 = nf1; |
145368f5 | 1478 | nfa.nhs = nf1->n.nhs; |
c3226991 | 1479 | br_metric = nf1->n.metric1; |
508c36ab | 1480 | } |
1a61882d | 1481 | else |
c3226991 | 1482 | { |
70945cb6 | 1483 | nf2 = ospf_fib_route(&p->rtf, rt.fwaddr, MAX_PREFIX_LENGTH); |
54818e9b | 1484 | if (!nf2) |
2e10a170 | 1485 | continue; |
98ac6176 | 1486 | |
70945cb6 | 1487 | if (en->lsa_type == LSA_T_EXT) |
41b612c3 OZ |
1488 | { |
1489 | /* For ext routes, we accept intra-area or inter-area routes */ | |
1490 | if ((nf2->n.type != RTS_OSPF) && (nf2->n.type != RTS_OSPF_IA)) | |
1491 | continue; | |
1492 | } | |
1493 | else /* NSSA */ | |
1494 | { | |
1495 | /* For NSSA routes, we accept just intra-area in the same area */ | |
1496 | if ((nf2->n.type != RTS_OSPF) || (nf2->n.oa != atmp)) | |
1497 | continue; | |
1498 | } | |
98ac6176 | 1499 | |
e0a62ad0 | 1500 | /* Next-hop is a part of a configured stubnet */ |
57c574d8 | 1501 | if (!nf2->n.nhs) |
e0a62ad0 OZ |
1502 | continue; |
1503 | ||
145368f5 | 1504 | nfa.nhs = nf2->n.nhs; |
c3226991 | 1505 | br_metric = nf2->n.metric1; |
145368f5 OZ |
1506 | |
1507 | /* Replace device nexthops with nexthops to forwarding address from LSA */ | |
1508 | if (has_device_nexthops(nfa.nhs)) | |
1509 | { | |
70945cb6 | 1510 | nfa.nhs = fix_device_nexthops(p, nfa.nhs, rt.fwaddr); |
145368f5 OZ |
1511 | nfa.nhs_reuse = 1; |
1512 | } | |
aa1e082c | 1513 | } |
508c36ab | 1514 | |
70945cb6 | 1515 | if (rt.ebit) |
c3226991 OZ |
1516 | { |
1517 | nfa.type = RTS_OSPF_EXT2; | |
1518 | nfa.metric1 = br_metric; | |
70945cb6 | 1519 | nfa.metric2 = rt.metric; |
c3226991 OZ |
1520 | } |
1521 | else | |
1522 | { | |
1523 | nfa.type = RTS_OSPF_EXT1; | |
70945cb6 | 1524 | nfa.metric1 = br_metric + rt.metric; |
c3226991 OZ |
1525 | nfa.metric2 = LSINFINITY; |
1526 | } | |
1527 | ||
0ea8fb4a OZ |
1528 | /* Mark the LSA as reachable */ |
1529 | en->color = INSPF; | |
1530 | ||
3b89a232 OZ |
1531 | /* Whether the route is preferred in route selection according to 16.4.1 */ |
1532 | nfa.options = epath_preferred(&nf2->n) ? ORTA_PREF : 0; | |
70945cb6 | 1533 | if (en->lsa_type == LSA_T_NSSA) |
2918e610 | 1534 | { |
ed317862 | 1535 | nfa.options |= ORTA_NSSA; |
70945cb6 | 1536 | if (rt.propagate) |
2918e610 OZ |
1537 | nfa.options |= ORTA_PROP; |
1538 | } | |
3b89a232 | 1539 | |
70945cb6 | 1540 | nfa.tag = rt.tag; |
c27b2449 | 1541 | nfa.rid = en->lsa.rt; |
ed317862 | 1542 | nfa.oa = atmp; /* undefined in RFC 2328 */ |
ed317862 | 1543 | nfa.en = en; /* store LSA for later (NSSA processing) */ |
3b89a232 | 1544 | |
70945cb6 | 1545 | ri_install_ext(p, rt.ip, rt.pxlen, &nfa); |
3b89a232 OZ |
1546 | } |
1547 | } | |
1548 | ||
57c574d8 | 1549 | /* Cleanup of routing tables and data */ |
6384c7d7 | 1550 | void |
70945cb6 | 1551 | ospf_rt_reset(struct ospf_proto *p) |
3b89a232 | 1552 | { |
6384c7d7 OZ |
1553 | struct ospf_area *oa; |
1554 | struct top_hash_entry *en; | |
1555 | struct area_net *anet; | |
1556 | ort *ri; | |
3b89a232 | 1557 | |
6384c7d7 | 1558 | /* Reset old routing table */ |
70945cb6 | 1559 | FIB_WALK(&p->rtf, nftmp) |
3b89a232 | 1560 | { |
6384c7d7 | 1561 | ri = (ort *) nftmp; |
a7a7372a | 1562 | ri->area_net = 0; |
57c574d8 | 1563 | reset_ri(ri); |
6384c7d7 OZ |
1564 | } |
1565 | FIB_WALK_END; | |
1566 | ||
1567 | /* Reset SPF data in LSA db */ | |
70945cb6 | 1568 | WALK_SLIST(en, p->lsal) |
6384c7d7 OZ |
1569 | { |
1570 | en->color = OUTSPF; | |
1571 | en->dist = LSINFINITY; | |
57c574d8 | 1572 | en->nhs = NULL; |
6384c7d7 | 1573 | en->lb = IPA_NONE; |
70945cb6 | 1574 | |
a7a7372a OZ |
1575 | if (en->mode == LSA_M_RTCALC) |
1576 | en->mode = LSA_M_STALE; | |
6384c7d7 OZ |
1577 | } |
1578 | ||
70945cb6 | 1579 | WALK_LIST(oa, p->area_list) |
6384c7d7 OZ |
1580 | { |
1581 | /* Reset ASBR routing tables */ | |
1582 | FIB_WALK(&oa->rtr, nftmp) | |
3b89a232 | 1583 | { |
6384c7d7 | 1584 | ri = (ort *) nftmp; |
57c574d8 | 1585 | reset_ri(ri); |
6384c7d7 OZ |
1586 | } |
1587 | FIB_WALK_END; | |
3b89a232 | 1588 | |
6384c7d7 | 1589 | /* Reset condensed area networks */ |
70945cb6 | 1590 | if (p->areano > 1) |
6384c7d7 OZ |
1591 | { |
1592 | FIB_WALK(&oa->net_fib, nftmp) | |
3b89a232 | 1593 | { |
6384c7d7 OZ |
1594 | anet = (struct area_net *) nftmp; |
1595 | anet->active = 0; | |
1596 | anet->metric = 0; | |
3b89a232 | 1597 | } |
6384c7d7 | 1598 | FIB_WALK_END; |
ed317862 OZ |
1599 | |
1600 | FIB_WALK(&oa->enet_fib, nftmp) | |
1601 | { | |
1602 | anet = (struct area_net *) nftmp; | |
1603 | anet->active = 0; | |
1604 | anet->metric = 0; | |
1605 | } | |
1606 | FIB_WALK_END; | |
3b89a232 OZ |
1607 | } |
1608 | } | |
1609 | } | |
6384c7d7 | 1610 | |
3b89a232 OZ |
1611 | /** |
1612 | * ospf_rt_spf - calculate internal routes | |
a7a7372a | 1613 | * @p: OSPF protocol instance |
3b89a232 OZ |
1614 | * |
1615 | * Calculation of internal paths in an area is described in 16.1 of RFC 2328. | |
1616 | * It's based on Dijkstra's shortest path tree algorithms. | |
1617 | * This function is invoked from ospf_disp(). | |
1618 | */ | |
1619 | void | |
70945cb6 | 1620 | ospf_rt_spf(struct ospf_proto *p) |
3b89a232 | 1621 | { |
3b89a232 | 1622 | struct ospf_area *oa; |
3b89a232 | 1623 | |
70945cb6 | 1624 | if (p->areano == 0) |
6384c7d7 | 1625 | return; |
3b89a232 | 1626 | |
3b89a232 OZ |
1627 | OSPF_TRACE(D_EVENTS, "Starting routing table calculation"); |
1628 | ||
6384c7d7 | 1629 | /* 16. (1) */ |
70945cb6 | 1630 | ospf_rt_reset(p); |
3b89a232 | 1631 | |
6384c7d7 | 1632 | /* 16. (2) */ |
70945cb6 | 1633 | WALK_LIST(oa, p->area_list) |
3b89a232 | 1634 | ospf_rt_spfa(oa); |
3b89a232 OZ |
1635 | |
1636 | /* 16. (3) */ | |
70945cb6 | 1637 | ospf_rt_sum(ospf_main_area(p)); |
3b89a232 OZ |
1638 | |
1639 | /* 16. (4) */ | |
70945cb6 | 1640 | WALK_LIST(oa, p->area_list) |
3b89a232 OZ |
1641 | if (oa->trcap && (oa->areaid != 0)) |
1642 | ospf_rt_sum_tr(oa); | |
1643 | ||
70945cb6 OZ |
1644 | if (p->areano > 1) |
1645 | ospf_rt_abr1(p); | |
3b89a232 OZ |
1646 | |
1647 | /* 16. (5) */ | |
70945cb6 | 1648 | ospf_ext_spf(p); |
3b89a232 | 1649 | |
70945cb6 OZ |
1650 | if (p->areano > 1) |
1651 | ospf_rt_abr2(p); | |
ed317862 | 1652 | |
70945cb6 OZ |
1653 | rt_sync(p); |
1654 | lp_flush(p->nhpool); | |
742029eb | 1655 | |
70945cb6 | 1656 | p->calcrt = 0; |
dfa9a53a OF |
1657 | } |
1658 | ||
57c574d8 | 1659 | |
57c574d8 OZ |
1660 | static inline int |
1661 | inherit_nexthops(struct mpnh *pn) | |
1662 | { | |
1663 | /* Proper nexthops (with defined GW) or dummy vlink nexthops (without iface) */ | |
1664 | return pn && (ipa_nonzero(pn->gw) || !pn->iface); | |
1665 | } | |
1666 | ||
1667 | static struct mpnh * | |
1668 | calc_next_hop(struct ospf_area *oa, struct top_hash_entry *en, | |
e7b4948c | 1669 | struct top_hash_entry *par, int pos) |
57c574d8 | 1670 | { |
70945cb6 | 1671 | struct ospf_proto *p = oa->po; |
57c574d8 OZ |
1672 | struct mpnh *pn = par->nhs; |
1673 | struct ospf_iface *ifa; | |
1674 | u32 rid = en->lsa.rt; | |
1675 | ||
1676 | /* 16.1.1. The next hop calculation */ | |
1677 | DBG(" Next hop calculating for id: %R rt: %R type: %u\n", | |
70945cb6 | 1678 | en->lsa.id, en->lsa.rt, en->lsa_type); |
57c574d8 OZ |
1679 | |
1680 | /* Usually, we inherit parent nexthops */ | |
1681 | if (inherit_nexthops(pn)) | |
1682 | return pn; | |
1683 | ||
742029eb | 1684 | /* |
57c574d8 OZ |
1685 | * There are three cases: |
1686 | * 1) en is a local network (and par is root) | |
1687 | * 2) en is a ptp or ptmp neighbor (and par is root) | |
1688 | * 3) en is a bcast or nbma neighbor (and par is local network) | |
1689 | */ | |
1690 | ||
1691 | /* The first case - local network */ | |
70945cb6 | 1692 | if ((en->lsa_type == LSA_T_NET) && (par == oa->rt)) |
57c574d8 | 1693 | { |
e7b4948c OZ |
1694 | ifa = rt_pos_to_ifa(oa, pos); |
1695 | if (!ifa) | |
1696 | return NULL; | |
57c574d8 | 1697 | |
70945cb6 | 1698 | return new_nexthop(p, IPA_NONE, ifa->iface, ifa->ecmp_weight); |
57c574d8 OZ |
1699 | } |
1700 | ||
1701 | /* The second case - ptp or ptmp neighbor */ | |
70945cb6 | 1702 | if ((en->lsa_type == LSA_T_RT) && (par == oa->rt)) |
57c574d8 | 1703 | { |
e7b4948c OZ |
1704 | ifa = rt_pos_to_ifa(oa, pos); |
1705 | if (!ifa) | |
1706 | return NULL; | |
1707 | ||
1708 | if (ifa->type == OSPF_IT_VLINK) | |
70945cb6 | 1709 | return new_nexthop(p, IPA_NONE, NULL, 0); |
57c574d8 | 1710 | |
e7b4948c OZ |
1711 | struct ospf_neighbor *m = find_neigh(ifa, rid); |
1712 | if (!m || (m->state != NEIGHBOR_FULL)) | |
1713 | return NULL; | |
1714 | ||
70945cb6 | 1715 | return new_nexthop(p, m->ip, ifa->iface, ifa->ecmp_weight); |
57c574d8 OZ |
1716 | } |
1717 | ||
1718 | /* The third case - bcast or nbma neighbor */ | |
70945cb6 | 1719 | if ((en->lsa_type == LSA_T_RT) && (par->lsa_type == LSA_T_NET)) |
57c574d8 OZ |
1720 | { |
1721 | /* par->nhi should be defined from parent's calc_next_hop() */ | |
1722 | if (!pn) | |
1723 | goto bad; | |
1724 | ||
70945cb6 OZ |
1725 | if (ospf_is_v2(p)) |
1726 | { | |
1727 | /* | |
1728 | * In this case, next-hop is the same as link-back, which is | |
1729 | * already computed in link_back(). | |
1730 | */ | |
1731 | if (ipa_zero(en->lb)) | |
1732 | goto bad; | |
57c574d8 | 1733 | |
70945cb6 OZ |
1734 | return new_nexthop(p, en->lb, pn->iface, pn->weight); |
1735 | } | |
1736 | else /* OSPFv3 */ | |
1737 | { | |
1738 | /* | |
1739 | * Next-hop is taken from lladdr field of Link-LSA, en->lb_id | |
1740 | * is computed in link_back(). | |
1741 | */ | |
1742 | struct top_hash_entry *lhe; | |
1743 | lhe = ospf_hash_find(p->gr, pn->iface->index, en->lb_id, rid, LSA_T_LINK); | |
57c574d8 | 1744 | |
70945cb6 OZ |
1745 | if (!lhe) |
1746 | return NULL; | |
57c574d8 | 1747 | |
70945cb6 | 1748 | struct ospf_lsa_link *llsa = lhe->lsa_body; |
742029eb | 1749 | |
88a183c6 | 1750 | if (ip6_zero(llsa->lladdr)) |
70945cb6 | 1751 | return NULL; |
57c574d8 | 1752 | |
88a183c6 | 1753 | return new_nexthop(p, ipa_from_ip6(llsa->lladdr), pn->iface, pn->weight); |
70945cb6 | 1754 | } |
57c574d8 OZ |
1755 | } |
1756 | ||
1757 | bad: | |
1758 | /* Probably bug or some race condition, we log it */ | |
f8fefde3 | 1759 | log(L_ERR "%s: Unexpected case in next hop calculation", p->p.name); |
57c574d8 OZ |
1760 | return NULL; |
1761 | } | |
1762 | ||
57c574d8 | 1763 | |
baa5dd6c | 1764 | /* Add LSA into list of candidates in Dijkstra's algorithm */ |
b8f17cf1 | 1765 | static void |
2e10a170 | 1766 | add_cand(list * l, struct top_hash_entry *en, struct top_hash_entry *par, |
e7b4948c | 1767 | u32 dist, struct ospf_area *oa, int pos) |
dfa9a53a | 1768 | { |
70945cb6 | 1769 | struct ospf_proto *p = oa->po; |
2e10a170 OF |
1770 | node *prev, *n; |
1771 | int added = 0; | |
e80e9d0d | 1772 | struct top_hash_entry *act; |
dfa9a53a | 1773 | |
b49e6f5a | 1774 | /* 16.1. (2b) */ |
2e10a170 OF |
1775 | if (en == NULL) |
1776 | return; | |
1777 | if (en->lsa.age == LSA_MAXAGE) | |
1778 | return; | |
98ac6176 | 1779 | |
70945cb6 OZ |
1780 | if (ospf_is_v3(p) && (en->lsa_type == LSA_T_RT)) |
1781 | { | |
1782 | /* In OSPFv3, check V6 flag */ | |
1783 | struct ospf_lsa_rt *rt = en->lsa_body; | |
1784 | if (!(rt->options & OPT_V6)) | |
1785 | return; | |
1786 | } | |
b49e6f5a | 1787 | |
c3226991 | 1788 | /* 16.1. (2c) */ |
2e10a170 OF |
1789 | if (en->color == INSPF) |
1790 | return; | |
dfa9a53a | 1791 | |
6384c7d7 | 1792 | /* 16.1. (2d), also checks that dist < LSINFINITY */ |
57c574d8 | 1793 | if (dist > en->dist) |
2e10a170 | 1794 | return; |
98ac6176 | 1795 | |
9807690b | 1796 | /* We should check whether there is a reverse link from en to par, */ |
98ac6176 OF |
1797 | if (!link_back(oa, en, par)) |
1798 | return; | |
1799 | ||
e7b4948c | 1800 | struct mpnh *nhs = calc_next_hop(oa, en, par, pos); |
57c574d8 | 1801 | if (!nhs) |
b76aeb82 | 1802 | { |
f8fefde3 OZ |
1803 | log(L_WARN "%s: Cannot find next hop for LSA (Type: %04x, Id: %R, Rt: %R)", |
1804 | p->p.name, en->lsa_type, en->lsa.id, en->lsa.rt); | |
b76aeb82 OZ |
1805 | return; |
1806 | } | |
1807 | ||
d217ba51 | 1808 | /* If en->dist > 0, we know that en->color == CANDIDATE and en->nhs is defined. */ |
145368f5 | 1809 | if ((dist == en->dist) && !nh_is_vlink(en->nhs)) |
57c574d8 OZ |
1810 | { |
1811 | /* | |
145368f5 OZ |
1812 | * For multipath, we should merge nexthops. We merge regular nexthops only. |
1813 | * Dummy vlink nexthops are less preferred and handled as a special case. | |
1814 | * | |
1815 | * During merging, new nexthops (nhs) can be reused if they are not | |
1816 | * inherited from the parent (i.e. they are allocated in calc_next_hop()). | |
1817 | * Current nexthops (en->nhs) can be reused if they weren't inherited in | |
1818 | * previous steps (that is stored in nhs_reuse, i.e. created by merging or | |
1819 | * allocated in calc_next_hop()). | |
1820 | * | |
1821 | * Generally, a node first inherits shared nexthops from its parent and | |
d217ba51 OZ |
1822 | * later possibly gets reusable (private) copy during merging. This is more |
1823 | * or less same for both top_hash_entry nodes and orta nodes. | |
1824 | * | |
1825 | * Note that when a child inherits a private nexthop from its parent, it | |
1826 | * should make the nexthop shared for both parent and child, while we only | |
1827 | * update nhs_reuse for the child node. This makes nhs_reuse field for the | |
1828 | * parent technically incorrect, but it is not a problem as parent's nhs | |
1829 | * will not be modified (and nhs_reuse examined) afterwards. | |
57c574d8 | 1830 | */ |
57c574d8 OZ |
1831 | |
1832 | /* Keep old ones */ | |
70945cb6 | 1833 | if (!p->ecmp || nh_is_vlink(nhs) || (nhs == en->nhs)) |
57c574d8 OZ |
1834 | return; |
1835 | ||
1836 | /* Merge old and new */ | |
145368f5 | 1837 | int new_reuse = (par->nhs != nhs); |
d217ba51 | 1838 | en->nhs = mpnh_merge(en->nhs, nhs, en->nhs_reuse, new_reuse, p->ecmp, p->nhpool); |
145368f5 OZ |
1839 | en->nhs_reuse = 1; |
1840 | return; | |
57c574d8 OZ |
1841 | } |
1842 | ||
3aab39f5 | 1843 | DBG(" Adding candidate: rt: %R, id: %R, type: %u\n", |
70945cb6 | 1844 | en->lsa.rt, en->lsa.id, en->lsa_type); |
2e10a170 | 1845 | |
1a61882d OF |
1846 | if (en->color == CANDIDATE) |
1847 | { /* We found a shorter path */ | |
e80e9d0d | 1848 | rem_node(&en->cn); |
dfa9a53a | 1849 | } |
57c574d8 | 1850 | en->nhs = nhs; |
2e10a170 OF |
1851 | en->dist = dist; |
1852 | en->color = CANDIDATE; | |
57c574d8 | 1853 | en->nhs_reuse = (par->nhs != nhs); |
dfa9a53a | 1854 | |
2e10a170 | 1855 | prev = NULL; |
dfa9a53a | 1856 | |
2e10a170 | 1857 | if (EMPTY_LIST(*l)) |
e80e9d0d | 1858 | { |
2e10a170 | 1859 | add_head(l, &en->cn); |
85195f1a OF |
1860 | } |
1861 | else | |
1862 | { | |
2e10a170 | 1863 | WALK_LIST(n, *l) |
dfa9a53a | 1864 | { |
2e10a170 OF |
1865 | act = SKIP_BACK(struct top_hash_entry, cn, n); |
1866 | if ((act->dist > dist) || | |
70945cb6 | 1867 | ((act->dist == dist) && (act->lsa_type == LSA_T_RT))) |
85195f1a | 1868 | { |
2e10a170 OF |
1869 | if (prev == NULL) |
1870 | add_head(l, &en->cn); | |
1871 | else | |
1872 | insert_node(&en->cn, prev); | |
1873 | added = 1; | |
1874 | break; | |
85195f1a | 1875 | } |
2e10a170 | 1876 | prev = n; |
85195f1a OF |
1877 | } |
1878 | ||
2e10a170 | 1879 | if (!added) |
85195f1a | 1880 | { |
2e10a170 | 1881 | add_tail(l, &en->cn); |
dfa9a53a OF |
1882 | } |
1883 | } | |
1884 | } | |
468f2347 | 1885 | |
b49e6f5a | 1886 | static inline int |
57c574d8 | 1887 | ort_changed(ort *nf, rta *nr) |
b49e6f5a | 1888 | { |
57c574d8 OZ |
1889 | rta *or = nf->old_rta; |
1890 | return !or || | |
1891 | (nf->n.metric1 != nf->old_metric1) || (nf->n.metric2 != nf->old_metric2) || | |
1892 | (nf->n.tag != nf->old_tag) || (nf->n.rid != nf->old_rid) || | |
1893 | (nr->source != or->source) || (nr->dest != or->dest) || | |
1894 | (nr->iface != or->iface) || !ipa_equal(nr->gw, or->gw) || | |
1895 | !mpnh_same(nr->nexthops, or->nexthops); | |
a92847e7 | 1896 | } |
1a61882d OF |
1897 | |
1898 | static void | |
70945cb6 | 1899 | rt_sync(struct ospf_proto *p) |
1a61882d | 1900 | { |
70945cb6 | 1901 | struct top_hash_entry *en; |
1a61882d | 1902 | struct fib_iterator fit; |
70945cb6 | 1903 | struct fib *fib = &p->rtf; |
1a61882d | 1904 | ort *nf; |
6384c7d7 | 1905 | struct ospf_area *oa; |
98ac6176 | 1906 | |
f7574707 | 1907 | /* This is used for forced reload of routes */ |
70945cb6 | 1908 | int reload = (p->calcrt == 2); |
f7574707 | 1909 | |
98ac6176 | 1910 | OSPF_TRACE(D_EVENTS, "Starting routing table synchronisation"); |
1a61882d OF |
1911 | |
1912 | DBG("Now syncing my rt table with nest's\n"); | |
1913 | FIB_ITERATE_INIT(&fit, fib); | |
98ac6176 | 1914 | again1: |
1a61882d OF |
1915 | FIB_ITERATE_START(fib, &fit, nftmp) |
1916 | { | |
1917 | nf = (ort *) nftmp; | |
3b89a232 | 1918 | |
57c574d8 OZ |
1919 | /* Sanity check of next-hop addresses, failure should not happen */ |
1920 | if (nf->n.type) | |
6384c7d7 | 1921 | { |
57c574d8 OZ |
1922 | struct mpnh *nh; |
1923 | for (nh = nf->n.nhs; nh; nh = nh->next) | |
1924 | if (ipa_nonzero(nh->gw)) | |
1925 | { | |
70945cb6 | 1926 | neighbor *ng = neigh_find2(&p->p, &nh->gw, nh->iface, 0); |
57c574d8 OZ |
1927 | if (!ng || (ng->scope == SCOPE_HOST)) |
1928 | { reset_ri(nf); break; } | |
1929 | } | |
6384c7d7 | 1930 | } |
27a1e3ac | 1931 | |
e0a62ad0 | 1932 | /* Remove configured stubnets */ |
57c574d8 OZ |
1933 | if (!nf->n.nhs) |
1934 | reset_ri(nf); | |
e0a62ad0 | 1935 | |
57c574d8 | 1936 | if (nf->n.type) /* Add the route */ |
6384c7d7 | 1937 | { |
57c574d8 | 1938 | rta a0 = { |
70945cb6 | 1939 | .src = p->p.main_source, |
57c574d8 OZ |
1940 | .source = nf->n.type, |
1941 | .scope = SCOPE_UNIVERSE, | |
094d2bdb | 1942 | .cast = RTC_UNICAST |
57c574d8 OZ |
1943 | }; |
1944 | ||
1945 | if (nf->n.nhs->next) | |
98ac6176 | 1946 | { |
57c574d8 OZ |
1947 | a0.dest = RTD_MULTIPATH; |
1948 | a0.nexthops = nf->n.nhs; | |
1949 | } | |
1950 | else if (ipa_nonzero(nf->n.nhs->gw)) | |
1951 | { | |
1952 | a0.dest = RTD_ROUTER; | |
1953 | a0.iface = nf->n.nhs->iface; | |
1954 | a0.gw = nf->n.nhs->gw; | |
1955 | } | |
1956 | else | |
1957 | { | |
1958 | a0.dest = RTD_DEVICE; | |
1959 | a0.iface = nf->n.nhs->iface; | |
1960 | } | |
6384c7d7 | 1961 | |
57c574d8 OZ |
1962 | if (reload || ort_changed(nf, &a0)) |
1963 | { | |
70945cb6 | 1964 | net *ne = net_get(p->p.table, nf->fn.prefix, nf->fn.pxlen); |
57c574d8 OZ |
1965 | rta *a = rta_lookup(&a0); |
1966 | rte *e = rte_get_temp(a); | |
1967 | ||
1968 | rta_free(nf->old_rta); | |
1969 | nf->old_rta = rta_clone(a); | |
1970 | e->u.ospf.metric1 = nf->old_metric1 = nf->n.metric1; | |
1971 | e->u.ospf.metric2 = nf->old_metric2 = nf->n.metric2; | |
1972 | e->u.ospf.tag = nf->old_tag = nf->n.tag; | |
1973 | e->u.ospf.router_id = nf->old_rid = nf->n.rid; | |
6384c7d7 OZ |
1974 | e->pflags = 0; |
1975 | e->net = ne; | |
70945cb6 | 1976 | e->pref = p->p.preference; |
57c574d8 | 1977 | |
6384c7d7 OZ |
1978 | DBG("Mod rte type %d - %I/%d via %I on iface %s, met %d\n", |
1979 | a0.source, nf->fn.prefix, nf->fn.pxlen, a0.gw, a0.iface ? a0.iface->name : "(none)", nf->n.metric1); | |
70945cb6 | 1980 | rte_update(&p->p, ne, e); |
98ac6176 | 1981 | } |
57c574d8 OZ |
1982 | } |
1983 | else if (nf->old_rta) | |
1984 | { | |
1985 | /* Remove the route */ | |
1986 | rta_free(nf->old_rta); | |
1987 | nf->old_rta = NULL; | |
1988 | ||
70945cb6 OZ |
1989 | net *ne = net_get(p->p.table, nf->fn.prefix, nf->fn.pxlen); |
1990 | rte_update(&p->p, ne, NULL); | |
6384c7d7 OZ |
1991 | } |
1992 | ||
a7a7372a OZ |
1993 | /* Remove unused rt entry, some special entries are persistent */ |
1994 | if (!nf->n.type && !nf->external_rte && !nf->area_net) | |
6384c7d7 | 1995 | { |
3b89a232 OZ |
1996 | FIB_ITERATE_PUT(&fit, nftmp); |
1997 | fib_delete(fib, nftmp); | |
1998 | goto again1; | |
1a61882d OF |
1999 | } |
2000 | } | |
2001 | FIB_ITERATE_END(nftmp); | |
98ac6176 | 2002 | |
3b89a232 | 2003 | |
70945cb6 | 2004 | WALK_LIST(oa, p->area_list) |
98ac6176 | 2005 | { |
6384c7d7 | 2006 | /* Cleanup ASBR hash tables */ |
98ac6176 OF |
2007 | FIB_ITERATE_INIT(&fit, &oa->rtr); |
2008 | again2: | |
2009 | FIB_ITERATE_START(&oa->rtr, &fit, nftmp) | |
2010 | { | |
2011 | nf = (ort *) nftmp; | |
98ac6176 | 2012 | |
6384c7d7 | 2013 | if (!nf->n.type) |
3b16080c | 2014 | { |
6384c7d7 OZ |
2015 | FIB_ITERATE_PUT(&fit, nftmp); |
2016 | fib_delete(&oa->rtr, nftmp); | |
2017 | goto again2; | |
3b16080c | 2018 | } |
98ac6176 | 2019 | } |
6384c7d7 | 2020 | FIB_ITERATE_END(nftmp); |
98ac6176 | 2021 | } |
70945cb6 OZ |
2022 | |
2023 | /* Cleanup stale LSAs */ | |
2024 | WALK_SLIST(en, p->lsal) | |
a7a7372a | 2025 | if (en->mode == LSA_M_STALE) |
70945cb6 | 2026 | ospf_flush_lsa(p, en); |
1a61882d | 2027 | } |