]>
Commit | Line | Data |
---|---|---|
6ba36f06 MM |
1 | /* |
2 | * BIRD -- OSPF Topological Database | |
3 | * | |
98ac6176 OF |
4 | * (c) 1999 Martin Mares <mj@ucw.cz> |
5 | * (c) 1999--2004 Ondrej Filip <feela@network.cz> | |
70945cb6 OZ |
6 | * (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org> |
7 | * (c) 2009--2014 CZ.NIC z.s.p.o. | |
6ba36f06 MM |
8 | * |
9 | * Can be freely distributed and used under the terms of the GNU GPL. | |
10 | */ | |
11 | ||
6ba36f06 | 12 | #include "nest/bird.h" |
221135d6 | 13 | #include "lib/string.h" |
6ba36f06 MM |
14 | |
15 | #include "ospf.h" | |
16 | ||
70945cb6 | 17 | |
8d56febe | 18 | #define HASH_DEF_ORDER 6 |
6ba36f06 MM |
19 | #define HASH_HI_MARK *4 |
20 | #define HASH_HI_STEP 2 | |
21 | #define HASH_HI_MAX 16 | |
22 | #define HASH_LO_MARK /5 | |
23 | #define HASH_LO_STEP 2 | |
24 | #define HASH_LO_MIN 8 | |
25 | ||
70945cb6 OZ |
26 | static inline void * lsab_flush(struct ospf_proto *p); |
27 | static inline void lsab_reset(struct ospf_proto *p); | |
b49e6f5a | 28 | |
b49e6f5a | 29 | |
70945cb6 OZ |
30 | /** |
31 | * ospf_install_lsa - install new LSA into database | |
32 | * @p: OSPF protocol instance | |
33 | * @lsa: LSA header | |
742029eb | 34 | * @type: type of LSA |
70945cb6 OZ |
35 | * @domain: domain of LSA |
36 | * @body: pointer to LSA body | |
37 | * | |
38 | * This function ensures installing new LSA received in LS update into LSA | |
39 | * database. Old instance is replaced. Several actions are taken to detect if | |
40 | * new routing table calculation is necessary. This is described in 13.2 of RFC | |
41 | * 2328. This function is for received LSA only, locally originated LSAs are | |
42 | * installed by ospf_originate_lsa(). | |
a7a7372a OZ |
43 | * |
44 | * The LSA body in @body is expected to be mb_allocated by the caller and its | |
45 | * ownership is transferred to the LSA entry structure. | |
70945cb6 OZ |
46 | */ |
47 | struct top_hash_entry * | |
48 | ospf_install_lsa(struct ospf_proto *p, struct ospf_lsa_header *lsa, u32 type, u32 domain, void *body) | |
49 | { | |
70945cb6 OZ |
50 | struct top_hash_entry *en; |
51 | int change = 0; | |
d82fc18d | 52 | |
70945cb6 | 53 | en = ospf_hash_get(p->gr, domain, lsa->id, lsa->rt, type); |
d82fc18d | 54 | |
70945cb6 OZ |
55 | if (!SNODE_VALID(en)) |
56 | s_add_tail(&p->lsal, SNODE en); | |
57 | ||
58 | if ((en->lsa_body == NULL) || /* No old LSA */ | |
59 | (en->lsa.length != lsa->length) || | |
60 | (en->lsa.type_raw != lsa->type_raw) || /* Check for OSPFv2 options */ | |
61 | (en->lsa.age == LSA_MAXAGE) || | |
62 | (lsa->age == LSA_MAXAGE) || | |
63 | memcmp(en->lsa_body, body, lsa->length - sizeof(struct ospf_lsa_header))) | |
64 | change = 1; | |
65 | ||
a7a7372a OZ |
66 | if ((en->lsa.age == LSA_MAXAGE) && (lsa->age == LSA_MAXAGE)) |
67 | change = 0; | |
70945cb6 OZ |
68 | |
69 | mb_free(en->lsa_body); | |
70 | en->lsa_body = body; | |
71 | en->lsa = *lsa; | |
72 | en->init_age = en->lsa.age; | |
b32d557a | 73 | en->inst_time = current_time(); |
70945cb6 | 74 | |
a7a7372a OZ |
75 | /* |
76 | * We do not set en->mode. It is either default LSA_M_BASIC, or in a special | |
77 | * case when en is local but flushed, there is postponed LSA, self-originated | |
78 | * LSA is received and ospf_install_lsa() is called from ospf_advance_lse(), | |
79 | * then we have en->mode from the postponed LSA origination. | |
80 | */ | |
81 | ||
82 | OSPF_TRACE(D_EVENTS, "Installing LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x, Age: %u", | |
83 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn, en->lsa.age); | |
84 | ||
70945cb6 | 85 | if (change) |
a7a7372a | 86 | ospf_schedule_rtcalc(p); |
70945cb6 OZ |
87 | |
88 | return en; | |
89 | } | |
90 | ||
a7a7372a OZ |
91 | /** |
92 | * ospf_advance_lsa - handle received unexpected self-originated LSA | |
93 | * @p: OSPF protocol instance | |
94 | * @en: current LSA entry or NULL | |
95 | * @lsa: new LSA header | |
742029eb | 96 | * @type: type of LSA |
a7a7372a OZ |
97 | * @domain: domain of LSA |
98 | * @body: pointer to LSA body | |
99 | * | |
100 | * This function handles received unexpected self-originated LSA (@lsa, @body) | |
101 | * by either advancing sequence number of the local LSA instance (@en) and | |
102 | * propagating it, or installing the received LSA and immediately flushing it | |
103 | * (if there is no local LSA; i.e., @en is NULL or MaxAge). | |
104 | * | |
105 | * The LSA body in @body is expected to be mb_allocated by the caller and its | |
106 | * ownership is transferred to the LSA entry structure or it is freed. | |
107 | */ | |
70945cb6 OZ |
108 | void |
109 | ospf_advance_lsa(struct ospf_proto *p, struct top_hash_entry *en, struct ospf_lsa_header *lsa, u32 type, u32 domain, void *body) | |
110 | { | |
a7a7372a | 111 | /* RFC 2328 13.4 */ |
70945cb6 OZ |
112 | |
113 | if (en && (en->lsa.age < LSA_MAXAGE)) | |
114 | { | |
115 | if (lsa->sn != LSA_MAXSEQNO) | |
116 | { | |
117 | /* | |
118 | * We simply advance current LSA to have higher seqnum than received LSA. | |
119 | * The received LSA is ignored and the advanced LSA is propagated instead. | |
120 | * | |
121 | * Although this is an origination of distinct LSA instance and therefore | |
122 | * should be limited by MinLSInterval, we do not enforce it here. Fast | |
123 | * reaction is needed and we are already limited by MinLSArrival. | |
124 | */ | |
125 | ||
126 | mb_free(body); | |
127 | ||
128 | en->lsa.sn = lsa->sn + 1; | |
129 | en->lsa.age = 0; | |
130 | en->init_age = 0; | |
b32d557a | 131 | en->inst_time = current_time(); |
77edab64 | 132 | lsa_generate_checksum(&en->lsa, en->lsa_body); |
a7a7372a OZ |
133 | |
134 | OSPF_TRACE(D_EVENTS, "Advancing LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x", | |
135 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn); | |
70945cb6 OZ |
136 | } |
137 | else | |
138 | { | |
742029eb | 139 | /* |
70945cb6 OZ |
140 | * Received LSA has maximal sequence number, so we cannot simply override |
141 | * it. We have to install it to the database, immediately flush it to | |
142 | * implement sequence number wrapping, and schedule our current LSA to be | |
143 | * originated after the received instance is flushed. | |
144 | */ | |
145 | ||
146 | if (en->next_lsa_body == NULL) | |
147 | { | |
148 | /* Schedule current LSA */ | |
149 | en->next_lsa_blen = en->lsa.length - sizeof(struct ospf_lsa_header); | |
150 | en->next_lsa_body = en->lsa_body; | |
151 | en->next_lsa_opts = ospf_is_v2(p) ? lsa_get_options(&en->lsa) : 0; | |
152 | } | |
153 | else | |
154 | { | |
155 | /* There is already scheduled LSA, so we just free current one */ | |
156 | mb_free(en->lsa_body); | |
157 | } | |
158 | ||
159 | en->lsa_body = body; | |
160 | en->lsa = *lsa; | |
161 | en->lsa.age = LSA_MAXAGE; | |
162 | en->init_age = lsa->age; | |
b32d557a | 163 | en->inst_time = current_time(); |
a7a7372a OZ |
164 | |
165 | OSPF_TRACE(D_EVENTS, "Resetting LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x", | |
166 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn); | |
167 | OSPF_TRACE(D_EVENTS, "Postponing LSA: Type: %04x, Id: %R, Rt: %R", | |
168 | en->lsa_type, en->lsa.id, en->lsa.rt); | |
70945cb6 OZ |
169 | } |
170 | } | |
d82fc18d | 171 | else |
70945cb6 OZ |
172 | { |
173 | /* | |
174 | * We do not have received LSA in the database. We have to flush the | |
175 | * received LSA. It has to be installed in the database to secure | |
176 | * retransmissions. Note that the received LSA may already be MaxAge. | |
a7a7372a | 177 | * Also note that en->next_lsa_* may be defined. |
70945cb6 OZ |
178 | */ |
179 | ||
180 | lsa->age = LSA_MAXAGE; | |
181 | en = ospf_install_lsa(p, lsa, type, domain, body); | |
182 | } | |
183 | ||
742029eb | 184 | /* |
70945cb6 OZ |
185 | * We flood the updated LSA. Although in some cases the to-be-flooded LSA is |
186 | * the same as the received LSA, and therefore we should propagate it as | |
742029eb | 187 | * regular received LSA (send the acknowledgement instead of the update to |
70945cb6 OZ |
188 | * the neighbor we received it from), we cheat a bit here. |
189 | */ | |
190 | ||
a7a7372a | 191 | ospf_flood_lsa(p, en, NULL); |
d82fc18d OZ |
192 | } |
193 | ||
d82fc18d | 194 | |
70945cb6 OZ |
195 | static int |
196 | ospf_do_originate_lsa(struct ospf_proto *p, struct top_hash_entry *en, void *lsa_body, u16 lsa_blen, u16 lsa_opts) | |
d82fc18d | 197 | { |
70945cb6 | 198 | /* Enforce MinLSInterval */ |
b32d557a | 199 | if (!en->init_age && en->inst_time && (lsa_inst_age(en) < MINLSINTERVAL)) |
70945cb6 OZ |
200 | return 0; |
201 | ||
202 | /* Handle wrapping sequence number */ | |
203 | if (en->lsa.sn == LSA_MAXSEQNO) | |
204 | { | |
205 | /* Prepare to flush old LSA */ | |
206 | if (en->lsa.age != LSA_MAXAGE) | |
207 | { | |
a7a7372a OZ |
208 | OSPF_TRACE(D_EVENTS, "Resetting LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x", |
209 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn); | |
70945cb6 OZ |
210 | |
211 | en->lsa.age = LSA_MAXAGE; | |
a7a7372a | 212 | ospf_flood_lsa(p, en, NULL); |
70945cb6 OZ |
213 | return 0; |
214 | } | |
215 | ||
216 | /* Already flushing */ | |
217 | if ((p->padj != 0) || (en->ret_count != 0)) | |
218 | return 0; | |
219 | ||
220 | /* Flush done, just clean up seqnum, lsa_body is freed below */ | |
221 | en->lsa.sn = LSA_ZEROSEQNO; | |
222 | } | |
223 | ||
6384c7d7 | 224 | /* |
70945cb6 OZ |
225 | * lsa.type_raw is initialized by ospf_hash_get() to OSPFv3 LSA type. |
226 | * lsa_set_options() implicitly converts it to OSPFv2 LSA type, assuming that | |
227 | * old type is just new type masked by 0xff. That is not universally true, | |
228 | * but it holds for all OSPFv2 types currently supported by BIRD. | |
6384c7d7 | 229 | */ |
70945cb6 OZ |
230 | |
231 | if (ospf_is_v2(p)) | |
232 | lsa_set_options(&en->lsa, lsa_opts); | |
233 | ||
234 | mb_free(en->lsa_body); | |
235 | en->lsa_body = lsa_body; | |
236 | en->lsa.length = sizeof(struct ospf_lsa_header) + lsa_blen; | |
237 | en->lsa.sn++; | |
238 | en->lsa.age = 0; | |
239 | en->init_age = 0; | |
b32d557a | 240 | en->inst_time = current_time(); |
77edab64 | 241 | lsa_generate_checksum(&en->lsa, en->lsa_body); |
70945cb6 | 242 | |
a7a7372a OZ |
243 | OSPF_TRACE(D_EVENTS, "Originating LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x", |
244 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn); | |
245 | ||
246 | ospf_flood_lsa(p, en, NULL); | |
247 | ||
248 | if (en->mode == LSA_M_BASIC) | |
249 | ospf_schedule_rtcalc(p); | |
70945cb6 OZ |
250 | |
251 | return 1; | |
d82fc18d OZ |
252 | } |
253 | ||
70945cb6 OZ |
254 | /** |
255 | * ospf_originate_lsa - originate new LSA | |
256 | * @p: OSPF protocol instance | |
257 | * @lsa: New LSA specification | |
258 | * | |
259 | * This function prepares a new LSA, installs it into the LSA database and | |
260 | * floods it. If the new LSA cannot be originated now (because the old instance | |
261 | * was originated within MinLSInterval, or because the LSA seqnum is currently | |
262 | * wrapping), the origination is instead scheduled for later. If the new LSA is | |
263 | * equivalent to the current LSA, the origination is skipped. In all cases, the | |
264 | * corresponding LSA entry is returned. The new LSA is based on the LSA | |
265 | * specification (@lsa) and the LSA body from lsab buffer of @p, which is | |
266 | * emptied after the call. The opposite of this function is ospf_flush_lsa(). | |
267 | */ | |
268 | struct top_hash_entry * | |
269 | ospf_originate_lsa(struct ospf_proto *p, struct ospf_new_lsa *lsa) | |
270 | { | |
271 | struct top_hash_entry *en; | |
272 | void *lsa_body = p->lsab; | |
273 | u16 lsa_blen = p->lsab_used; | |
274 | u16 lsa_length = sizeof(struct ospf_lsa_header) + lsa_blen; | |
b49e6f5a | 275 | |
70945cb6 | 276 | en = ospf_hash_get(p->gr, lsa->dom, lsa->id, p->router_id, lsa->type); |
b49e6f5a | 277 | |
70945cb6 OZ |
278 | if (!SNODE_VALID(en)) |
279 | s_add_tail(&p->lsal, SNODE en); | |
280 | ||
39a6b19d | 281 | if (!en->nf || !en->lsa_body) |
70945cb6 OZ |
282 | en->nf = lsa->nf; |
283 | ||
284 | if (en->nf != lsa->nf) | |
285 | { | |
fe9f1a6d OZ |
286 | log(L_ERR "%s: LSA ID collision for %N", |
287 | p->p.name, lsa->nf->fn.addr); | |
a7a7372a OZ |
288 | |
289 | en = NULL; | |
70945cb6 OZ |
290 | goto drop; |
291 | } | |
292 | ||
a7a7372a OZ |
293 | if (en->mode != lsa->mode) |
294 | en->mode = lsa->mode; | |
70945cb6 OZ |
295 | |
296 | if (en->next_lsa_body) | |
297 | { | |
298 | /* Ignore the new LSA if it is the same as the scheduled one */ | |
a7a7372a OZ |
299 | if ((lsa_blen == en->next_lsa_blen) && |
300 | !memcmp(lsa_body, en->next_lsa_body, lsa_blen) && | |
301 | (!ospf_is_v2(p) || (lsa->opts == en->next_lsa_opts))) | |
70945cb6 OZ |
302 | goto drop; |
303 | ||
304 | /* Free scheduled LSA */ | |
305 | mb_free(en->next_lsa_body); | |
306 | en->next_lsa_body = NULL; | |
307 | en->next_lsa_blen = 0; | |
308 | en->next_lsa_opts = 0; | |
309 | } | |
310 | ||
311 | /* Ignore the the new LSA if is the same as the current one */ | |
a7a7372a OZ |
312 | if ((en->lsa.age < LSA_MAXAGE) && |
313 | (lsa_length == en->lsa.length) && | |
314 | !memcmp(lsa_body, en->lsa_body, lsa_blen) && | |
315 | (!ospf_is_v2(p) || (lsa->opts == lsa_get_options(&en->lsa)))) | |
70945cb6 OZ |
316 | goto drop; |
317 | ||
318 | lsa_body = lsab_flush(p); | |
319 | ||
320 | if (! ospf_do_originate_lsa(p, en, lsa_body, lsa_blen, lsa->opts)) | |
321 | { | |
a7a7372a OZ |
322 | OSPF_TRACE(D_EVENTS, "Postponing LSA: Type: %04x, Id: %R, Rt: %R", |
323 | en->lsa_type, en->lsa.id, en->lsa.rt); | |
324 | ||
70945cb6 OZ |
325 | en->next_lsa_body = lsa_body; |
326 | en->next_lsa_blen = lsa_blen; | |
327 | en->next_lsa_opts = lsa->opts; | |
328 | } | |
329 | ||
330 | return en; | |
331 | ||
332 | drop: | |
333 | lsab_reset(p); | |
334 | return en; | |
335 | } | |
336 | ||
337 | static void | |
338 | ospf_originate_next_lsa(struct ospf_proto *p, struct top_hash_entry *en) | |
3d15dcdb | 339 | { |
70945cb6 OZ |
340 | /* Called by ospf_update_lsadb() to handle scheduled origination */ |
341 | ||
342 | if (! ospf_do_originate_lsa(p, en, en->next_lsa_body, en->next_lsa_blen, en->next_lsa_opts)) | |
343 | return; | |
742029eb | 344 | |
70945cb6 OZ |
345 | en->next_lsa_body = NULL; |
346 | en->next_lsa_blen = 0; | |
347 | en->next_lsa_opts = 0; | |
70945cb6 OZ |
348 | } |
349 | ||
350 | static void | |
351 | ospf_refresh_lsa(struct ospf_proto *p, struct top_hash_entry *en) | |
352 | { | |
353 | /* | |
354 | * Called by ospf_update_lsadb() for periodic LSA refresh. | |
355 | * | |
356 | * We know that lsa.age < LSA_MAXAGE and lsa.rt is our router ID. We can also | |
357 | * assume that there is no scheduled LSA, because inst_time is deep in past, | |
358 | * therefore ospf_originate_next_lsa() called before would either succeed or | |
359 | * switched lsa.age to LSA_MAXAGE. | |
360 | */ | |
361 | ||
a7a7372a OZ |
362 | OSPF_TRACE(D_EVENTS, "Refreshing LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x", |
363 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn); | |
70945cb6 OZ |
364 | |
365 | ASSERT(en->next_lsa_body == NULL); | |
366 | ||
367 | /* Handle wrapping sequence number */ | |
368 | if (en->lsa.sn == LSA_MAXSEQNO) | |
369 | { | |
370 | /* Copy LSA body as next LSA to get automatic origination after flush is finished */ | |
371 | en->next_lsa_blen = en->lsa.length - sizeof(struct ospf_lsa_header); | |
372 | en->next_lsa_body = mb_alloc(p->p.pool, en->next_lsa_blen); | |
373 | memcpy(en->next_lsa_body, en->lsa_body, en->next_lsa_blen); | |
374 | en->next_lsa_opts = ospf_is_v2(p) ? lsa_get_options(&en->lsa) : 0; | |
375 | ||
376 | en->lsa.age = LSA_MAXAGE; | |
a7a7372a | 377 | ospf_flood_lsa(p, en, NULL); |
70945cb6 OZ |
378 | return; |
379 | } | |
380 | ||
381 | en->lsa.sn++; | |
382 | en->lsa.age = 0; | |
383 | en->init_age = 0; | |
b32d557a | 384 | en->inst_time = current_time(); |
77edab64 | 385 | lsa_generate_checksum(&en->lsa, en->lsa_body); |
a7a7372a | 386 | ospf_flood_lsa(p, en, NULL); |
70945cb6 OZ |
387 | } |
388 | ||
389 | /** | |
390 | * ospf_flush_lsa - flush LSA from OSPF domain | |
391 | * @p: OSPF protocol instance | |
392 | * @en: LSA entry to flush | |
393 | * | |
394 | * This function flushes @en from the OSPF domain by setting its age to | |
395 | * %LSA_MAXAGE and flooding it. That also triggers subsequent events in LSA | |
396 | * lifecycle leading to removal of the LSA from the LSA database (e.g. the LSA | |
397 | * content is freed when flushing is acknowledged by neighbors). The function | |
398 | * does nothing if the LSA is already being flushed. LSA entries are not | |
399 | * immediately removed when being flushed, the caller may assume that @en still | |
400 | * exists after the call. The function is the opposite of ospf_originate_lsa() | |
401 | * and is supposed to do the right thing even in cases of postponed | |
a7a7372a | 402 | * origination. |
70945cb6 OZ |
403 | */ |
404 | void | |
405 | ospf_flush_lsa(struct ospf_proto *p, struct top_hash_entry *en) | |
406 | { | |
cea2e25f OZ |
407 | en->nf = NULL; |
408 | ||
70945cb6 OZ |
409 | if (en->next_lsa_body) |
410 | { | |
411 | mb_free(en->next_lsa_body); | |
412 | en->next_lsa_body = NULL; | |
413 | en->next_lsa_blen = 0; | |
414 | en->next_lsa_opts = 0; | |
415 | } | |
416 | ||
417 | if (en->lsa.age == LSA_MAXAGE) | |
418 | return; | |
419 | ||
6f8bbaa1 OZ |
420 | OSPF_TRACE(D_EVENTS, "Flushing LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x", |
421 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn); | |
422 | ||
70945cb6 | 423 | en->lsa.age = LSA_MAXAGE; |
a7a7372a OZ |
424 | ospf_flood_lsa(p, en, NULL); |
425 | ||
426 | if (en->mode == LSA_M_BASIC) | |
427 | ospf_schedule_rtcalc(p); | |
428 | ||
429 | en->mode = LSA_M_BASIC; | |
70945cb6 OZ |
430 | } |
431 | ||
432 | static void | |
433 | ospf_clear_lsa(struct ospf_proto *p, struct top_hash_entry *en) | |
434 | { | |
435 | /* | |
436 | * Called by ospf_update_lsadb() as part of LSA flushing process. | |
437 | * Flushed LSA was acknowledged by neighbors and we can free its content. | |
6f8bbaa1 | 438 | * The log message is for 'remove' - we hide empty LSAs from users. |
70945cb6 OZ |
439 | */ |
440 | ||
6f8bbaa1 OZ |
441 | OSPF_TRACE(D_EVENTS, "Removing LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x", |
442 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn); | |
443 | ||
70945cb6 OZ |
444 | if (en->lsa.sn == LSA_MAXSEQNO) |
445 | en->lsa.sn = LSA_ZEROSEQNO; | |
446 | ||
447 | mb_free(en->lsa_body); | |
448 | en->lsa_body = NULL; | |
449 | } | |
450 | ||
451 | static void | |
452 | ospf_remove_lsa(struct ospf_proto *p, struct top_hash_entry *en) | |
453 | { | |
454 | /* | |
455 | * Called by ospf_update_lsadb() as part of LSA flushing process. | |
456 | * Both lsa_body and next_lsa_body are NULL. | |
457 | */ | |
458 | ||
459 | s_rem_node(SNODE en); | |
460 | ospf_hash_delete(p->gr, en); | |
461 | } | |
462 | ||
463 | /** | |
464 | * ospf_update_lsadb - update LSA database | |
465 | * @p: OSPF protocol instance | |
466 | * | |
467 | * This function is periodicaly invoked from ospf_disp(). It does some periodic | |
468 | * or postponed processing related to LSA entries. It originates postponed LSAs | |
469 | * scheduled by ospf_originate_lsa(), It continues in flushing processes started | |
470 | * by ospf_flush_lsa(). It also periodically refreshs locally originated LSAs -- | |
471 | * when the current instance is older %LSREFRESHTIME, a new instance is originated. | |
472 | * Finally, it also ages stored LSAs and flushes ones that reached %LSA_MAXAGE. | |
473 | * | |
474 | * The RFC 2328 says that a router should periodically check checksums of all | |
475 | * stored LSAs to detect hardware problems. This is not implemented. | |
476 | */ | |
477 | void | |
478 | ospf_update_lsadb(struct ospf_proto *p) | |
479 | { | |
480 | struct top_hash_entry *en, *nxt; | |
b32d557a OZ |
481 | btime now_ = current_time(); |
482 | int real_age; | |
70945cb6 OZ |
483 | |
484 | WALK_SLIST_DELSAFE(en, nxt, p->lsal) | |
485 | { | |
486 | if (en->next_lsa_body) | |
487 | ospf_originate_next_lsa(p, en); | |
488 | ||
b32d557a | 489 | real_age = en->init_age + (now_ - en->inst_time) TO_S; |
70945cb6 OZ |
490 | |
491 | if (en->lsa.age == LSA_MAXAGE) | |
492 | { | |
493 | if (en->lsa_body && (p->padj == 0) && (en->ret_count == 0)) | |
494 | ospf_clear_lsa(p, en); | |
495 | ||
496 | if ((en->lsa_body == NULL) && (en->next_lsa_body == NULL) && | |
497 | ((en->lsa.rt != p->router_id) || (real_age >= LSA_MAXAGE))) | |
498 | ospf_remove_lsa(p, en); | |
499 | ||
500 | continue; | |
501 | } | |
502 | ||
503 | if ((en->lsa.rt == p->router_id) && (real_age >= LSREFRESHTIME)) | |
504 | { | |
505 | ospf_refresh_lsa(p, en); | |
506 | continue; | |
507 | } | |
508 | ||
509 | if (real_age >= LSA_MAXAGE) | |
3d15dcdb | 510 | { |
70945cb6 | 511 | ospf_flush_lsa(p, en); |
70945cb6 | 512 | continue; |
3d15dcdb | 513 | } |
70945cb6 OZ |
514 | |
515 | en->lsa.age = real_age; | |
516 | } | |
517 | } | |
518 | ||
519 | ||
74c838a8 | 520 | static u32 |
70945cb6 OZ |
521 | ort_to_lsaid(struct ospf_proto *p, ort *nf) |
522 | { | |
523 | /* | |
524 | * In OSPFv2, We have to map IP prefixes to u32 in such manner that resulting | |
525 | * u32 interpreted as IP address is a member of given prefix. Therefore, /32 | |
fe9f1a6d OZ |
526 | * prefix has to be mapped on itself. All received prefixes have to be mapped |
527 | * on different u32s. | |
70945cb6 OZ |
528 | * |
529 | * We have an assumption that if there is nontrivial (non-/32) network prefix, | |
530 | * then there is not /32 prefix for the first and the last IP address of the | |
531 | * network (these are usually reserved, therefore it is not an important | |
532 | * restriction). The network prefix is mapped to the first or the last IP | |
533 | * address in the manner that disallow collisions - we use the IP address that | |
534 | * cannot be used by the parent prefix. | |
535 | * | |
536 | * For example: | |
537 | * 192.168.0.0/24 maps to 192.168.0.255 | |
538 | * 192.168.1.0/24 maps to 192.168.1.0 | |
539 | * because 192.168.0.0 and 192.168.1.255 might be used by 192.168.0.0/23 . | |
540 | * | |
541 | * Appendig E of RFC 2328 suggests different algorithm, that tries to maximize | |
542 | * both compatibility and subnetting. But as it is not possible to have both | |
543 | * reliably and the suggested algorithm was unnecessary complicated and it | |
544 | * does crazy things like changing LSA ID for a network because different | |
545 | * network appeared, we choose a different way. | |
546 | * | |
547 | * In OSPFv3, it is simpler. There is not a requirement for membership of the | |
74c838a8 OZ |
548 | * result in the input network, so we just allocate a unique ID from ID map |
549 | * and store it in nf->lsa_id for further reference. | |
70945cb6 OZ |
550 | */ |
551 | ||
552 | if (ospf_is_v3(p)) | |
74c838a8 OZ |
553 | { |
554 | if (!nf->lsa_id) | |
555 | nf->lsa_id = idm_alloc(&p->idm); | |
556 | ||
557 | return nf->lsa_id; | |
558 | } | |
70945cb6 | 559 | |
fe9f1a6d OZ |
560 | net_addr_ip4 *net = (void *) nf->fn.addr; |
561 | u32 id = ip4_to_u32(net->prefix); | |
562 | int pxlen = net->pxlen; | |
70945cb6 OZ |
563 | |
564 | if ((pxlen == 0) || (pxlen == 32)) | |
565 | return id; | |
566 | ||
567 | if (id & (1 << (32 - pxlen))) | |
568 | return id; | |
569 | else | |
570 | return id | ~u32_mkmask(pxlen); | |
571 | } | |
572 | ||
573 | ||
574 | static void * | |
a7a7372a | 575 | lsab_alloc(struct ospf_proto *p, uint size) |
70945cb6 | 576 | { |
a7a7372a | 577 | uint offset = p->lsab_used; |
70945cb6 OZ |
578 | p->lsab_used += size; |
579 | if (p->lsab_used > p->lsab_size) | |
580 | { | |
581 | p->lsab_size = MAX(p->lsab_used, 2 * p->lsab_size); | |
582 | p->lsab = p->lsab ? mb_realloc(p->lsab, p->lsab_size): | |
583 | mb_alloc(p->p.pool, p->lsab_size); | |
584 | } | |
585 | return ((byte *) p->lsab) + offset; | |
3d15dcdb OZ |
586 | } |
587 | ||
588 | static inline void * | |
a7a7372a | 589 | lsab_allocz(struct ospf_proto *p, uint size) |
3d15dcdb | 590 | { |
70945cb6 | 591 | void *r = lsab_alloc(p, size); |
3d15dcdb OZ |
592 | bzero(r, size); |
593 | return r; | |
594 | } | |
595 | ||
596 | static inline void * | |
70945cb6 | 597 | lsab_flush(struct ospf_proto *p) |
3d15dcdb | 598 | { |
70945cb6 OZ |
599 | void *r = mb_alloc(p->p.pool, p->lsab_used); |
600 | memcpy(r, p->lsab, p->lsab_used); | |
601 | p->lsab_used = 0; | |
3d15dcdb OZ |
602 | return r; |
603 | } | |
604 | ||
70945cb6 OZ |
605 | static inline void |
606 | lsab_reset(struct ospf_proto *p) | |
c3226991 | 607 | { |
70945cb6 | 608 | p->lsab_used = 0; |
c3226991 OZ |
609 | } |
610 | ||
611 | static inline void * | |
a7a7372a | 612 | lsab_offset(struct ospf_proto *p, uint offset) |
c3226991 | 613 | { |
70945cb6 | 614 | return ((byte *) p->lsab) + offset; |
c3226991 OZ |
615 | } |
616 | ||
3e236955 | 617 | static inline void * UNUSED |
70945cb6 | 618 | lsab_end(struct ospf_proto *p) |
52572e94 | 619 | { |
70945cb6 | 620 | return ((byte *) p->lsab) + p->lsab_used; |
52572e94 OZ |
621 | } |
622 | ||
c3226991 | 623 | |
70945cb6 OZ |
624 | /* |
625 | * Router-LSA handling | |
626 | * Type = LSA_T_RT | |
627 | */ | |
628 | ||
38675202 OZ |
629 | static int |
630 | configured_stubnet(struct ospf_area *oa, struct ifa *a) | |
631 | { | |
52a43ae3 | 632 | /* Does not work for IA_PEER addresses, but it is not called on these */ |
38675202 OZ |
633 | struct ospf_stubnet_config *sn; |
634 | WALK_LIST(sn, oa->ac->stubnet_list) | |
70945cb6 OZ |
635 | { |
636 | if (sn->summary) | |
38675202 | 637 | { |
d44e686e | 638 | if (net_in_netX(&a->prefix, &sn->prefix)) |
70945cb6 | 639 | return 1; |
38675202 | 640 | } |
70945cb6 OZ |
641 | else |
642 | { | |
d44e686e | 643 | if (net_equal(&a->prefix, &sn->prefix)) |
70945cb6 OZ |
644 | return 1; |
645 | } | |
646 | } | |
647 | ||
38675202 OZ |
648 | return 0; |
649 | } | |
3d15dcdb | 650 | |
70945cb6 | 651 | static int |
c3226991 OZ |
652 | bcast_net_active(struct ospf_iface *ifa) |
653 | { | |
654 | struct ospf_neighbor *neigh; | |
655 | ||
656 | if (ifa->state == OSPF_IS_WAITING) | |
657 | return 0; | |
658 | ||
659 | WALK_LIST(neigh, ifa->neigh_list) | |
70945cb6 OZ |
660 | { |
661 | if (neigh->state == NEIGHBOR_FULL) | |
c3226991 | 662 | { |
70945cb6 OZ |
663 | if (neigh->rid == ifa->drid) |
664 | return 1; | |
c3226991 | 665 | |
70945cb6 OZ |
666 | if (ifa->state == OSPF_IS_DR) |
667 | return 1; | |
c3226991 | 668 | } |
70945cb6 | 669 | } |
c3226991 OZ |
670 | |
671 | return 0; | |
672 | } | |
673 | ||
70945cb6 OZ |
674 | static inline u32 |
675 | get_rt_options(struct ospf_proto *p, struct ospf_area *oa, int bitv) | |
676 | { | |
677 | u32 opts = 0; | |
c3226991 | 678 | |
70945cb6 OZ |
679 | if (p->areano > 1) |
680 | opts |= OPT_RT_B; | |
c3226991 | 681 | |
70945cb6 OZ |
682 | if ((p->areano > 1) && oa_is_nssa(oa) && oa->ac->translator) |
683 | opts |= OPT_RT_NT; | |
ce17d4c1 | 684 | |
70945cb6 OZ |
685 | if (p->asbr && !oa_is_stub(oa)) |
686 | opts |= OPT_RT_E; | |
c3226991 | 687 | |
70945cb6 OZ |
688 | if (bitv) |
689 | opts |= OPT_RT_V; | |
c3226991 | 690 | |
70945cb6 OZ |
691 | return opts; |
692 | } | |
c3226991 | 693 | |
70945cb6 OZ |
694 | static inline void |
695 | add_rt2_lsa_link(struct ospf_proto *p, u8 type, u32 id, u32 data, u16 metric) | |
696 | { | |
697 | struct ospf_lsa_rt2_link *ln = lsab_alloc(p, sizeof(struct ospf_lsa_rt2_link)); | |
698 | ln->type = type; | |
699 | ln->id = id; | |
700 | ln->data = data; | |
701 | ln->metric = metric; | |
702 | ln->no_tos = 0; | |
703 | } | |
4160a9dd | 704 | |
70945cb6 OZ |
705 | static void |
706 | prepare_rt2_lsa_body(struct ospf_proto *p, struct ospf_area *oa) | |
707 | { | |
708 | struct ospf_iface *ifa; | |
709 | int i = 0, bitv = 0; | |
710 | struct ospf_neighbor *neigh; | |
c3226991 | 711 | |
70945cb6 OZ |
712 | ASSERT(p->lsab_used == 0); |
713 | lsab_allocz(p, sizeof(struct ospf_lsa_rt)); | |
714 | /* ospf_lsa_rt header will be filled later */ | |
b9ed99f7 | 715 | |
70945cb6 | 716 | WALK_LIST(ifa, p->iface_list) |
ce17d4c1 | 717 | { |
353729f5 | 718 | int net_lsa = 0; |
70945cb6 | 719 | u32 link_cost = p->stub_router ? 0xffff : ifa->cost; |
3d15dcdb OZ |
720 | |
721 | if ((ifa->type == OSPF_IT_VLINK) && (ifa->voa == oa) && | |
722 | (!EMPTY_LIST(ifa->neigh_list))) | |
5d3f5552 OF |
723 | { |
724 | neigh = (struct ospf_neighbor *) HEAD(ifa->neigh_list); | |
725 | if ((neigh->state == NEIGHBOR_FULL) && (ifa->cost <= 0xffff)) | |
3d15dcdb | 726 | bitv = 1; |
5d3f5552 | 727 | } |
3b16080c OF |
728 | |
729 | if ((ifa->oa != oa) || (ifa->state == OSPF_IS_DOWN)) | |
b9ed99f7 | 730 | continue; |
3b580a23 | 731 | |
e7b4948c OZ |
732 | ifa->rt_pos_beg = i; |
733 | ||
70945cb6 | 734 | /* RFC 2328 - 12.4.1.1-4 */ |
3d15dcdb | 735 | switch (ifa->type) |
70945cb6 OZ |
736 | { |
737 | case OSPF_IT_PTP: | |
738 | case OSPF_IT_PTMP: | |
739 | WALK_LIST(neigh, ifa->neigh_list) | |
740 | if (neigh->state == NEIGHBOR_FULL) | |
98ac6176 | 741 | { |
70945cb6 OZ |
742 | /* |
743 | * ln->data should be ifa->iface_id in case of no/ptp | |
744 | * address (ifa->addr->flags & IA_PEER) on PTP link (see | |
745 | * RFC 2328 12.4.1.1.), but the iface ID value has no use, | |
746 | * while using IP address even in this case is here for | |
747 | * compatibility with some broken implementations that use | |
748 | * this address as a next-hop. | |
749 | */ | |
750 | add_rt2_lsa_link(p, LSART_PTP, neigh->rid, ipa_to_u32(ifa->addr->ip), link_cost); | |
3d15dcdb | 751 | i++; |
70945cb6 OZ |
752 | } |
753 | break; | |
3d15dcdb | 754 | |
70945cb6 OZ |
755 | case OSPF_IT_BCAST: |
756 | case OSPF_IT_NBMA: | |
757 | if (bcast_net_active(ifa)) | |
758 | { | |
759 | add_rt2_lsa_link(p, LSART_NET, ipa_to_u32(ifa->drip), ipa_to_u32(ifa->addr->ip), link_cost); | |
760 | i++; | |
761 | net_lsa = 1; | |
ce17d4c1 | 762 | } |
70945cb6 OZ |
763 | break; |
764 | ||
765 | case OSPF_IT_VLINK: | |
766 | neigh = (struct ospf_neighbor *) HEAD(ifa->neigh_list); | |
767 | if ((!EMPTY_LIST(ifa->neigh_list)) && (neigh->state == NEIGHBOR_FULL) && (ifa->cost <= 0xffff)) | |
768 | add_rt2_lsa_link(p, LSART_VLNK, neigh->rid, ipa_to_u32(ifa->addr->ip), link_cost), i++; | |
769 | break; | |
770 | ||
771 | default: | |
f8fefde3 | 772 | log(L_BUG "OSPF: Unknown interface type"); |
70945cb6 OZ |
773 | break; |
774 | } | |
3d15dcdb | 775 | |
e7b4948c OZ |
776 | ifa->rt_pos_end = i; |
777 | ||
0aad2b92 OZ |
778 | /* Now we will originate stub area if there is no primary */ |
779 | if (net_lsa || | |
780 | (ifa->type == OSPF_IT_VLINK) || | |
a55a90fa | 781 | ((ifa->addr->flags & IA_PEER) && ! ifa->cf->stub) || |
0aad2b92 OZ |
782 | configured_stubnet(oa, ifa->addr)) |
783 | continue; | |
3d15dcdb | 784 | |
70945cb6 | 785 | /* Host or network stub entry */ |
52a43ae3 OZ |
786 | if ((ifa->addr->flags & IA_HOST) || |
787 | (ifa->state == OSPF_IS_LOOP) || | |
788 | (ifa->type == OSPF_IT_PTMP)) | |
70945cb6 | 789 | add_rt2_lsa_link(p, LSART_STUB, ipa_to_u32(ifa->addr->ip), 0xffffffff, 0); |
742029eb | 790 | else |
d44e686e OZ |
791 | add_rt2_lsa_link(p, LSART_STUB, ip4_to_u32(net4_prefix(&ifa->addr->prefix)), |
792 | u32_mkmask(net4_pxlen(&ifa->addr->prefix)), ifa->cost); | |
0aad2b92 | 793 | i++; |
e7b4948c OZ |
794 | |
795 | ifa->rt_pos_end = i; | |
ce17d4c1 | 796 | } |
3d15dcdb | 797 | |
38675202 | 798 | struct ospf_stubnet_config *sn; |
70945cb6 OZ |
799 | WALK_LIST(sn, oa->ac->stubnet_list) |
800 | if (!sn->hidden) | |
d44e686e OZ |
801 | add_rt2_lsa_link(p, LSART_STUB, ip4_to_u32(net4_prefix(&sn->prefix)), |
802 | u32_mkmask(net4_pxlen(&sn->prefix)), sn->cost), i++; | |
c3226991 | 803 | |
70945cb6 | 804 | struct ospf_lsa_rt *rt = p->lsab; |
742029eb | 805 | /* Store number of links in lower half of options */ |
70945cb6 | 806 | rt->options = get_rt_options(p, oa, bitv) | (u16) i; |
ce17d4c1 | 807 | } |
c45f48fb | 808 | |
70945cb6 OZ |
809 | static inline void |
810 | add_rt3_lsa_link(struct ospf_proto *p, u8 type, struct ospf_iface *ifa, u32 nif, u32 id) | |
c3226991 | 811 | { |
70945cb6 | 812 | struct ospf_lsa_rt3_link *ln = lsab_alloc(p, sizeof(struct ospf_lsa_rt3_link)); |
c3226991 OZ |
813 | ln->type = type; |
814 | ln->padding = 0; | |
815 | ln->metric = ifa->cost; | |
dd4da6f6 | 816 | ln->lif = ifa->iface_id; |
c3226991 OZ |
817 | ln->nif = nif; |
818 | ln->id = id; | |
819 | } | |
820 | ||
70945cb6 OZ |
821 | static void |
822 | prepare_rt3_lsa_body(struct ospf_proto *p, struct ospf_area *oa) | |
c3226991 | 823 | { |
c3226991 | 824 | struct ospf_iface *ifa; |
70945cb6 | 825 | struct ospf_neighbor *neigh; |
b49e6f5a | 826 | int bitv = 0; |
e7b4948c | 827 | int i = 0; |
4160a9dd | 828 | |
70945cb6 OZ |
829 | ASSERT(p->lsab_used == 0); |
830 | lsab_allocz(p, sizeof(struct ospf_lsa_rt)); | |
831 | /* ospf_lsa_rt header will be filled later */ | |
c3226991 | 832 | |
70945cb6 | 833 | WALK_LIST(ifa, p->iface_list) |
c3226991 OZ |
834 | { |
835 | if ((ifa->type == OSPF_IT_VLINK) && (ifa->voa == oa) && | |
836 | (!EMPTY_LIST(ifa->neigh_list))) | |
837 | { | |
838 | neigh = (struct ospf_neighbor *) HEAD(ifa->neigh_list); | |
839 | if ((neigh->state == NEIGHBOR_FULL) && (ifa->cost <= 0xffff)) | |
840 | bitv = 1; | |
841 | } | |
842 | ||
843 | if ((ifa->oa != oa) || (ifa->state == OSPF_IS_DOWN)) | |
844 | continue; | |
845 | ||
e7b4948c OZ |
846 | ifa->rt_pos_beg = i; |
847 | ||
70945cb6 | 848 | /* RFC 5340 - 4.4.3.2 */ |
c3226991 | 849 | switch (ifa->type) |
70945cb6 OZ |
850 | { |
851 | case OSPF_IT_PTP: | |
852 | case OSPF_IT_PTMP: | |
853 | WALK_LIST(neigh, ifa->neigh_list) | |
854 | if (neigh->state == NEIGHBOR_FULL) | |
855 | add_rt3_lsa_link(p, LSART_PTP, ifa, neigh->iface_id, neigh->rid), i++; | |
856 | break; | |
e7b4948c | 857 | |
70945cb6 OZ |
858 | case OSPF_IT_BCAST: |
859 | case OSPF_IT_NBMA: | |
860 | if (bcast_net_active(ifa)) | |
861 | add_rt3_lsa_link(p, LSART_NET, ifa, ifa->dr_iface_id, ifa->drid), i++; | |
862 | break; | |
c3226991 | 863 | |
70945cb6 OZ |
864 | case OSPF_IT_VLINK: |
865 | neigh = (struct ospf_neighbor *) HEAD(ifa->neigh_list); | |
866 | if ((!EMPTY_LIST(ifa->neigh_list)) && (neigh->state == NEIGHBOR_FULL) && (ifa->cost <= 0xffff)) | |
867 | add_rt3_lsa_link(p, LSART_VLNK, ifa, neigh->iface_id, neigh->rid), i++; | |
868 | break; | |
869 | ||
870 | default: | |
f8fefde3 | 871 | log(L_BUG "OSPF: Unknown interface type"); |
70945cb6 | 872 | break; |
c3226991 OZ |
873 | } |
874 | ||
70945cb6 OZ |
875 | ifa->rt_pos_end = i; |
876 | } | |
c3226991 | 877 | |
70945cb6 OZ |
878 | struct ospf_lsa_rt *rt = p->lsab; |
879 | rt->options = get_rt_options(p, oa, bitv) | (oa->options & LSA_OPTIONS_MASK); | |
880 | } | |
c3226991 | 881 | |
70945cb6 OZ |
882 | static void |
883 | ospf_originate_rt_lsa(struct ospf_proto *p, struct ospf_area *oa) | |
d8852b36 | 884 | { |
70945cb6 OZ |
885 | struct ospf_new_lsa lsa = { |
886 | .type = LSA_T_RT, | |
887 | .dom = oa->areaid, | |
888 | .id = ospf_is_v2(p) ? p->router_id : 0, | |
889 | .opts = oa->options | |
890 | }; | |
d8852b36 | 891 | |
a7a7372a OZ |
892 | OSPF_TRACE(D_EVENTS, "Updating router state for area %R", oa->areaid); |
893 | ||
70945cb6 OZ |
894 | if (ospf_is_v2(p)) |
895 | prepare_rt2_lsa_body(p, oa); | |
896 | else | |
897 | prepare_rt3_lsa_body(p, oa); | |
b9ed99f7 | 898 | |
70945cb6 OZ |
899 | oa->rt = ospf_originate_lsa(p, &lsa); |
900 | } | |
cf31112f | 901 | |
c3226991 | 902 | |
70945cb6 OZ |
903 | /* |
904 | * Net-LSA handling | |
905 | * Type = LSA_T_NET | |
906 | */ | |
b49e6f5a | 907 | |
70945cb6 OZ |
908 | static void |
909 | prepare_net2_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa) | |
b49e6f5a | 910 | { |
70945cb6 OZ |
911 | struct ospf_lsa_net *net; |
912 | struct ospf_neighbor *n; | |
913 | int nodes = ifa->fadj + 1; | |
914 | u16 i = 1; | |
b49e6f5a | 915 | |
70945cb6 OZ |
916 | ASSERT(p->lsab_used == 0); |
917 | net = lsab_alloc(p, sizeof(struct ospf_lsa_net) + 4 * nodes); | |
b49e6f5a | 918 | |
d44e686e | 919 | net->optx = u32_mkmask(ifa->addr->prefix.pxlen); |
70945cb6 | 920 | net->routers[0] = p->router_id; |
b49e6f5a | 921 | |
70945cb6 OZ |
922 | WALK_LIST(n, ifa->neigh_list) |
923 | { | |
924 | if (n->state == NEIGHBOR_FULL) | |
925 | { | |
926 | net->routers[i] = n->rid; | |
927 | i++; | |
928 | } | |
929 | } | |
930 | ASSERT(i == nodes); | |
ab56f6b1 OF |
931 | } |
932 | ||
70945cb6 OZ |
933 | static void |
934 | prepare_net3_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa) | |
0bf2f203 | 935 | { |
d345cda5 | 936 | struct ospf_lsa_net *net; |
c3226991 | 937 | int nodes = ifa->fadj + 1; |
c3226991 | 938 | u32 options = 0; |
70945cb6 OZ |
939 | u16 i = 1; |
940 | ||
941 | ASSERT(p->lsab_used == 0); | |
942 | net = lsab_alloc(p, sizeof(struct ospf_lsa_net) + 4 * nodes); | |
c3226991 | 943 | |
70945cb6 | 944 | net->routers[0] = p->router_id; |
d345cda5 | 945 | |
70945cb6 | 946 | struct ospf_neighbor *n; |
b9ed99f7 | 947 | WALK_LIST(n, ifa->neigh_list) |
0bf2f203 | 948 | { |
b9ed99f7 | 949 | if (n->state == NEIGHBOR_FULL) |
0bf2f203 | 950 | { |
70945cb6 OZ |
951 | /* In OSPFv3, we would like to merge options from Link LSAs of added neighbors */ |
952 | ||
953 | struct top_hash_entry *en = | |
954 | ospf_hash_find(p->gr, ifa->iface_id, n->iface_id, n->rid, LSA_T_LINK); | |
955 | ||
c3226991 OZ |
956 | if (en) |
957 | options |= ((struct ospf_lsa_link *) en->lsa_body)->options; | |
c3226991 OZ |
958 | |
959 | net->routers[i] = n->rid; | |
0bf2f203 OF |
960 | i++; |
961 | } | |
962 | } | |
c3226991 OZ |
963 | ASSERT(i == nodes); |
964 | ||
70945cb6 | 965 | net->optx = options & LSA_OPTIONS_MASK; |
0bf2f203 OF |
966 | } |
967 | ||
70945cb6 OZ |
968 | static void |
969 | ospf_originate_net_lsa(struct ospf_proto *p, struct ospf_iface *ifa) | |
970 | { | |
971 | struct ospf_new_lsa lsa = { | |
972 | .type = LSA_T_NET, | |
973 | .dom = ifa->oa->areaid, | |
974 | .id = ospf_is_v2(p) ? ipa_to_u32(ifa->addr->ip) : ifa->iface_id, | |
975 | .opts = ifa->oa->options, | |
976 | .ifa = ifa | |
977 | }; | |
978 | ||
a7a7372a OZ |
979 | OSPF_TRACE(D_EVENTS, "Updating network state for %s (Id: %R)", ifa->ifname, lsa.id); |
980 | ||
70945cb6 OZ |
981 | if (ospf_is_v2(p)) |
982 | prepare_net2_lsa_body(p, ifa); | |
b49e6f5a | 983 | else |
70945cb6 | 984 | prepare_net3_lsa_body(p, ifa); |
9727681a | 985 | |
70945cb6 | 986 | ifa->net_lsa = ospf_originate_lsa(p, &lsa); |
9727681a OZ |
987 | } |
988 | ||
7ff5803b | 989 | |
70945cb6 OZ |
990 | /* |
991 | * (Net|Rt)-summary-LSA handling | |
992 | * (a.k.a. Inter-Area-(Prefix|Router)-LSA) | |
993 | * Type = LSA_T_SUM_NET, LSA_T_SUM_RT | |
994 | */ | |
0077aab4 | 995 | |
70945cb6 OZ |
996 | static inline void |
997 | prepare_sum2_lsa_body(struct ospf_proto *p, uint pxlen, u32 metric) | |
0077aab4 | 998 | { |
70945cb6 | 999 | struct ospf_lsa_sum2 *sum; |
c3226991 | 1000 | |
70945cb6 OZ |
1001 | sum = lsab_allocz(p, sizeof(struct ospf_lsa_sum2)); |
1002 | sum->netmask = u32_mkmask(pxlen); | |
c3226991 | 1003 | sum->metric = metric; |
c3226991 OZ |
1004 | } |
1005 | ||
70945cb6 OZ |
1006 | static inline void |
1007 | prepare_sum3_net_lsa_body(struct ospf_proto *p, ort *nf, u32 metric) | |
9727681a | 1008 | { |
70945cb6 | 1009 | struct ospf_lsa_sum3_net *sum; |
9727681a | 1010 | |
fe9f1a6d OZ |
1011 | sum = lsab_allocz(p, sizeof(struct ospf_lsa_sum3_net) + |
1012 | IPV6_PREFIX_SPACE(nf->fn.addr->pxlen)); | |
70945cb6 | 1013 | sum->metric = metric; |
d3f4f92b | 1014 | ospf3_put_prefix(sum->prefix, nf->fn.addr, 0, 0); |
9727681a OZ |
1015 | } |
1016 | ||
70945cb6 OZ |
1017 | static inline void |
1018 | prepare_sum3_rt_lsa_body(struct ospf_proto *p, u32 drid, u32 metric, u32 options) | |
c3226991 | 1019 | { |
70945cb6 | 1020 | struct ospf_lsa_sum3_rt *sum; |
c3226991 | 1021 | |
70945cb6 | 1022 | sum = lsab_allocz(p, sizeof(struct ospf_lsa_sum3_rt)); |
7ff5803b | 1023 | sum->options = options; |
c3226991 OZ |
1024 | sum->metric = metric; |
1025 | sum->drid = drid; | |
7ff5803b OZ |
1026 | } |
1027 | ||
98ac6176 | 1028 | void |
70945cb6 | 1029 | ospf_originate_sum_net_lsa(struct ospf_proto *p, struct ospf_area *oa, ort *nf, int metric) |
98ac6176 | 1030 | { |
70945cb6 OZ |
1031 | struct ospf_new_lsa lsa = { |
1032 | .type = LSA_T_SUM_NET, | |
a7a7372a | 1033 | .mode = LSA_M_RTCALC, |
70945cb6 OZ |
1034 | .dom = oa->areaid, |
1035 | .id = ort_to_lsaid(p, nf), | |
1036 | .opts = oa->options, | |
1037 | .nf = nf | |
1038 | }; | |
7ff5803b | 1039 | |
70945cb6 | 1040 | if (ospf_is_v2(p)) |
fe9f1a6d | 1041 | prepare_sum2_lsa_body(p, nf->fn.addr->pxlen, metric); |
70945cb6 OZ |
1042 | else |
1043 | prepare_sum3_net_lsa_body(p, nf, metric); | |
c3226991 | 1044 | |
a7a7372a | 1045 | ospf_originate_lsa(p, &lsa); |
9727681a | 1046 | } |
c3226991 | 1047 | |
9727681a | 1048 | void |
fe9f1a6d | 1049 | ospf_originate_sum_rt_lsa(struct ospf_proto *p, struct ospf_area *oa, u32 drid, int metric, u32 options) |
9727681a | 1050 | { |
70945cb6 OZ |
1051 | struct ospf_new_lsa lsa = { |
1052 | .type = LSA_T_SUM_RT, | |
a7a7372a | 1053 | .mode = LSA_M_RTCALC, |
70945cb6 | 1054 | .dom = oa->areaid, |
fe9f1a6d | 1055 | .id = drid, /* Router ID of ASBR, irrelevant for OSPFv3 */ |
70945cb6 OZ |
1056 | .opts = oa->options |
1057 | }; | |
98ac6176 | 1058 | |
70945cb6 OZ |
1059 | if (ospf_is_v2(p)) |
1060 | prepare_sum2_lsa_body(p, 0, metric); | |
c3226991 | 1061 | else |
fe9f1a6d | 1062 | prepare_sum3_rt_lsa_body(p, drid, metric, options & LSA_OPTIONS_MASK); |
9727681a | 1063 | |
a7a7372a | 1064 | ospf_originate_lsa(p, &lsa); |
98ac6176 OF |
1065 | } |
1066 | ||
c3226991 | 1067 | |
7ff5803b | 1068 | /* |
70945cb6 OZ |
1069 | * AS-external-LSA and NSSA-LSA handling |
1070 | * Type = LSA_T_EXT, LSA_T_NSSA | |
7ff5803b | 1071 | */ |
c3226991 | 1072 | |
70945cb6 OZ |
1073 | static inline void |
1074 | prepare_ext2_lsa_body(struct ospf_proto *p, uint pxlen, | |
1075 | u32 metric, u32 ebit, ip_addr fwaddr, u32 tag) | |
7ff5803b | 1076 | { |
70945cb6 | 1077 | struct ospf_lsa_ext2 *ext; |
7ff5803b | 1078 | |
70945cb6 OZ |
1079 | ext = lsab_allocz(p, sizeof(struct ospf_lsa_ext2)); |
1080 | ext->metric = metric & LSA_METRIC_MASK; | |
1081 | ext->netmask = u32_mkmask(pxlen); | |
1082 | ext->fwaddr = ipa_to_u32(fwaddr); | |
1083 | ext->tag = tag; | |
7ff5803b | 1084 | |
70945cb6 OZ |
1085 | if (ebit) |
1086 | ext->metric |= LSA_EXT2_EBIT; | |
7ff5803b | 1087 | } |
c3226991 | 1088 | |
70945cb6 OZ |
1089 | static inline void |
1090 | prepare_ext3_lsa_body(struct ospf_proto *p, ort *nf, | |
1091 | u32 metric, u32 ebit, ip_addr fwaddr, u32 tag, int pbit) | |
7ff5803b | 1092 | { |
70945cb6 OZ |
1093 | struct ospf_lsa_ext3 *ext; |
1094 | int bsize = sizeof(struct ospf_lsa_ext3) | |
fe9f1a6d | 1095 | + IPV6_PREFIX_SPACE(nf->fn.addr->pxlen) |
7ff5803b OZ |
1096 | + (ipa_nonzero(fwaddr) ? 16 : 0) |
1097 | + (tag ? 4 : 0); | |
1098 | ||
70945cb6 OZ |
1099 | ext = lsab_allocz(p, bsize); |
1100 | ext->metric = metric & LSA_METRIC_MASK; | |
1101 | u32 *buf = ext->rest; | |
7ff5803b | 1102 | |
d3f4f92b | 1103 | buf = ospf3_put_prefix(buf, nf->fn.addr, pbit ? OPT_PX_P : 0, 0); |
7ff5803b | 1104 | |
70945cb6 OZ |
1105 | if (ebit) |
1106 | ext->metric |= LSA_EXT3_EBIT; | |
c3226991 | 1107 | |
7ff5803b OZ |
1108 | if (ipa_nonzero(fwaddr)) |
1109 | { | |
70945cb6 | 1110 | ext->metric |= LSA_EXT3_FBIT; |
d3f4f92b | 1111 | buf = ospf3_put_addr(buf, fwaddr); |
7ff5803b | 1112 | } |
c3226991 OZ |
1113 | |
1114 | if (tag) | |
7ff5803b | 1115 | { |
70945cb6 | 1116 | ext->metric |= LSA_EXT3_TBIT; |
7ff5803b OZ |
1117 | *buf++ = tag; |
1118 | } | |
c3226991 OZ |
1119 | } |
1120 | ||
70945cb6 OZ |
1121 | /** |
1122 | * originate_ext_lsa - new route received from nest and filters | |
a7a7372a | 1123 | * @p: OSPF protocol instance |
70945cb6 OZ |
1124 | * @oa: ospf_area for which LSA is originated |
1125 | * @nf: network prefix and mask | |
a7a7372a OZ |
1126 | * @mode: the mode of the LSA (LSA_M_EXPORT or LSA_M_RTCALC) |
1127 | * @metric: the metric of a route | |
1128 | * @ebit: E-bit for route metric (bool) | |
70945cb6 OZ |
1129 | * @fwaddr: the forwarding address |
1130 | * @tag: the route tag | |
a7a7372a | 1131 | * @pbit: P-bit for NSSA LSAs (bool), ignored for external LSAs |
70945cb6 OZ |
1132 | * |
1133 | * If I receive a message that new route is installed, I try to originate an | |
1134 | * external LSA. If @oa is an NSSA area, NSSA-LSA is originated instead. | |
1135 | * @oa should not be a stub area. @src does not specify whether the LSA | |
742029eb | 1136 | * is external or NSSA, but it specifies the source of origination - |
70945cb6 OZ |
1137 | * the export from ospf_rt_notify(), or the NSSA-EXT translation. |
1138 | */ | |
1139 | void | |
a7a7372a | 1140 | ospf_originate_ext_lsa(struct ospf_proto *p, struct ospf_area *oa, ort *nf, u8 mode, |
70945cb6 | 1141 | u32 metric, u32 ebit, ip_addr fwaddr, u32 tag, int pbit) |
7ff5803b | 1142 | { |
70945cb6 OZ |
1143 | struct ospf_new_lsa lsa = { |
1144 | .type = oa ? LSA_T_NSSA : LSA_T_EXT, | |
a7a7372a | 1145 | .mode = mode, /* LSA_M_EXPORT or LSA_M_RTCALC */ |
70945cb6 OZ |
1146 | .dom = oa ? oa->areaid : 0, |
1147 | .id = ort_to_lsaid(p, nf), | |
1148 | .opts = oa ? (pbit ? OPT_P : 0) : OPT_E, | |
1149 | .nf = nf | |
1150 | }; | |
7ff5803b | 1151 | |
70945cb6 | 1152 | if (ospf_is_v2(p)) |
fe9f1a6d | 1153 | prepare_ext2_lsa_body(p, nf->fn.addr->pxlen, metric, ebit, fwaddr, tag); |
70945cb6 OZ |
1154 | else |
1155 | prepare_ext3_lsa_body(p, nf, metric, ebit, fwaddr, tag, oa && pbit); | |
7ff5803b | 1156 | |
a7a7372a | 1157 | ospf_originate_lsa(p, &lsa); |
70945cb6 OZ |
1158 | } |
1159 | ||
6f8bbaa1 OZ |
1160 | static struct top_hash_entry * |
1161 | ospf_hash_find_(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type); | |
1162 | ||
70945cb6 OZ |
1163 | static void |
1164 | ospf_flush_ext_lsa(struct ospf_proto *p, struct ospf_area *oa, ort *nf) | |
1165 | { | |
1166 | struct top_hash_entry *en; | |
d395fe48 | 1167 | |
70945cb6 OZ |
1168 | u32 type = oa ? LSA_T_NSSA : LSA_T_EXT; |
1169 | u32 dom = oa ? oa->areaid : 0; | |
1170 | u32 id = ort_to_lsaid(p, nf); | |
7ff5803b | 1171 | |
6f8bbaa1 | 1172 | en = ospf_hash_find_(p->gr, dom, id, p->router_id, type); |
7ff5803b | 1173 | |
70945cb6 OZ |
1174 | if (!en || (en->nf != nf)) |
1175 | return; | |
7ff5803b | 1176 | |
70945cb6 | 1177 | ospf_flush_lsa(p, en); |
7ff5803b OZ |
1178 | } |
1179 | ||
70945cb6 OZ |
1180 | static inline int |
1181 | use_gw_for_fwaddr(struct ospf_proto *p, ip_addr gw, struct iface *iface) | |
1182 | { | |
1183 | struct ospf_iface *ifa; | |
1184 | ||
1185 | if (ipa_zero(gw) || ipa_is_link_local(gw)) | |
1186 | return 0; | |
7ff5803b | 1187 | |
70945cb6 OZ |
1188 | WALK_LIST(ifa, p->iface_list) |
1189 | if ((ifa->iface == iface) && | |
d44e686e | 1190 | (!ospf_is_v2(p) || ipa_in_netX(gw, &ifa->addr->prefix))) |
70945cb6 OZ |
1191 | return 1; |
1192 | ||
1193 | return 0; | |
1194 | } | |
7ff5803b | 1195 | |
2918e610 | 1196 | static inline ip_addr |
70945cb6 | 1197 | find_surrogate_fwaddr(struct ospf_proto *p, struct ospf_area *oa) |
2918e610 | 1198 | { |
2918e610 OZ |
1199 | struct ospf_iface *ifa; |
1200 | struct ifa *a, *cur_addr = NULL; | |
1201 | int np, cur_np = 0; | |
1202 | ||
70945cb6 OZ |
1203 | /* RFC 3101 2.3 - surrogate forwarding address selection */ |
1204 | ||
1205 | WALK_LIST(ifa, p->iface_list) | |
2918e610 OZ |
1206 | { |
1207 | if ((ifa->oa != oa) || | |
2918e610 OZ |
1208 | (ifa->type == OSPF_IT_VLINK)) |
1209 | continue; | |
1210 | ||
70945cb6 | 1211 | if (ospf_is_v2(p)) |
2918e610 | 1212 | { |
70945cb6 OZ |
1213 | a = ifa->addr; |
1214 | if (a->flags & IA_PEER) | |
2918e610 OZ |
1215 | continue; |
1216 | ||
70945cb6 | 1217 | np = (a->flags & IA_HOST) ? 3 : (ifa->stub ? 2 : 1); |
2918e610 OZ |
1218 | if (np > cur_np) |
1219 | { | |
1220 | cur_addr = a; | |
1221 | cur_np = np; | |
1222 | } | |
1223 | } | |
70945cb6 OZ |
1224 | else /* OSPFv3 */ |
1225 | { | |
1226 | WALK_LIST(a, ifa->iface->addrs) | |
1227 | { | |
d3f4f92b | 1228 | if ((a->prefix.type != ospf_get_af(p)) || |
d44e686e | 1229 | (a->flags & IA_SECONDARY) || |
70945cb6 OZ |
1230 | (a->flags & IA_PEER) || |
1231 | (a->scope <= SCOPE_LINK)) | |
1232 | continue; | |
1233 | ||
1234 | np = (a->flags & IA_HOST) ? 3 : (ifa->stub ? 2 : 1); | |
1235 | if (np > cur_np) | |
1236 | { | |
1237 | cur_addr = a; | |
1238 | cur_np = np; | |
1239 | } | |
1240 | } | |
1241 | } | |
2918e610 OZ |
1242 | } |
1243 | ||
1244 | return cur_addr ? cur_addr->ip : IPA_NONE; | |
1245 | } | |
1246 | ||
e8085aba | 1247 | void |
13c0be19 | 1248 | ospf_rt_notify(struct proto *P, struct channel *ch UNUSED, net *n, rte *new, rte *old UNUSED) |
e8085aba | 1249 | { |
70945cb6 OZ |
1250 | struct ospf_proto *p = (struct ospf_proto *) P; |
1251 | struct ospf_area *oa = NULL; /* non-NULL for NSSA-LSA */ | |
1252 | ort *nf; | |
41b612c3 | 1253 | |
70945cb6 OZ |
1254 | /* |
1255 | * There are several posibilities: | |
1256 | * 1) router in regular area - originate external LSA with global scope | |
1257 | * 2) router in NSSA area - originate area-specific NSSA-LSA | |
1258 | * 3) router in stub area - cannot export routes | |
1259 | * 4) area border router - same as (1), it is attached to backbone | |
1260 | */ | |
b9ed99f7 | 1261 | |
70945cb6 OZ |
1262 | if ((p->areano == 1) && oa_is_nssa(HEAD(p->area_list))) |
1263 | oa = HEAD(p->area_list); | |
273fd2c1 | 1264 | |
70945cb6 | 1265 | if (!new) |
41b612c3 | 1266 | { |
fe9f1a6d | 1267 | nf = fib_find(&p->rtf, n->n.addr); |
2918e610 | 1268 | |
70945cb6 | 1269 | if (!nf || !nf->external_rte) |
2918e610 | 1270 | return; |
41b612c3 | 1271 | |
70945cb6 OZ |
1272 | ospf_flush_ext_lsa(p, oa, nf); |
1273 | nf->external_rte = 0; | |
273fd2c1 | 1274 | |
70945cb6 OZ |
1275 | /* Old external route might blocked some NSSA translation */ |
1276 | if ((p->areano > 1) && rt_is_nssa(nf) && nf->n.oa->translate) | |
a7a7372a | 1277 | ospf_schedule_rtcalc(p); |
7ff5803b | 1278 | |
70945cb6 OZ |
1279 | return; |
1280 | } | |
c3226991 | 1281 | |
70945cb6 | 1282 | ASSERT(p->asbr); |
2918e610 | 1283 | |
70945cb6 OZ |
1284 | /* Get route attributes */ |
1285 | rta *a = new->attrs; | |
8bd718b3 OZ |
1286 | eattr *m1a = ea_find(a->eattrs, EA_OSPF_METRIC1); |
1287 | eattr *m2a = ea_find(a->eattrs, EA_OSPF_METRIC2); | |
feae132e OZ |
1288 | uint m1 = m1a ? m1a->u.data : 0; |
1289 | uint m2 = m2a ? m2a->u.data : 10000; | |
fdb19982 | 1290 | |
feae132e OZ |
1291 | if (m1 > LSINFINITY) |
1292 | { | |
1293 | log(L_WARN "%s: Invalid ospf_metric1 value %u for route %N", | |
1294 | p->p.name, m1, n->n.addr); | |
1295 | m1 = LSINFINITY; | |
1296 | } | |
e8085aba | 1297 | |
feae132e OZ |
1298 | if (m2 > LSINFINITY) |
1299 | { | |
1300 | log(L_WARN "%s: Invalid ospf_metric2 value %u for route %N", | |
1301 | p->p.name, m2, n->n.addr); | |
1302 | m2 = LSINFINITY; | |
1303 | } | |
1304 | ||
1305 | /* Ensure monotonicity of metric if both m1 and m2 are used */ | |
1306 | if ((m1 > 0) && (m2 < LSINFINITY)) | |
1307 | m2++; | |
1308 | ||
1309 | uint ebit = m2a || !m1a; | |
1310 | uint metric = ebit ? m2 : m1; | |
8bd718b3 | 1311 | uint tag = ea_get_int(a->eattrs, EA_OSPF_TAG, 0); |
feae132e OZ |
1312 | |
1313 | ip_addr fwd = IPA_NONE; | |
4e276a89 JMM |
1314 | if ((a->dest == RTD_UNICAST) && use_gw_for_fwaddr(p, a->nh.gw, a->nh.iface)) |
1315 | fwd = a->nh.gw; | |
be862406 | 1316 | |
70945cb6 OZ |
1317 | /* NSSA-LSA with P-bit set must have non-zero forwarding address */ |
1318 | if (oa && ipa_zero(fwd)) | |
1319 | { | |
1320 | fwd = find_surrogate_fwaddr(p, oa); | |
c3226991 | 1321 | |
70945cb6 | 1322 | if (ipa_zero(fwd)) |
c3226991 | 1323 | { |
fe9f1a6d OZ |
1324 | log(L_ERR "%s: Cannot find forwarding address for NSSA-LSA %N", |
1325 | p->p.name, n->n.addr); | |
70945cb6 | 1326 | return; |
c3226991 | 1327 | } |
70945cb6 OZ |
1328 | } |
1329 | ||
fe9f1a6d | 1330 | nf = fib_get(&p->rtf, n->n.addr); |
a7a7372a | 1331 | ospf_originate_ext_lsa(p, oa, nf, LSA_M_EXPORT, metric, ebit, fwd, tag, 1); |
70945cb6 | 1332 | nf->external_rte = 1; |
c3226991 OZ |
1333 | } |
1334 | ||
1335 | ||
70945cb6 OZ |
1336 | /* |
1337 | * Link-LSA handling (assume OSPFv3) | |
1338 | * Type = LSA_T_LINK | |
1339 | */ | |
c3226991 | 1340 | |
70945cb6 | 1341 | static inline void |
d3f4f92b | 1342 | lsab_put_prefix(struct ospf_proto *p, net_addr *n, u32 cost) |
70945cb6 | 1343 | { |
d3f4f92b OZ |
1344 | void *buf = lsab_alloc(p, IPV6_PREFIX_SPACE(net_pxlen(n))); |
1345 | uint max = (n->type == NET_IP4) ? IP4_MAX_PREFIX_LENGTH : IP6_MAX_PREFIX_LENGTH; | |
1346 | u8 flags = (net_pxlen(n) < max) ? 0 : OPT_PX_LA; | |
1347 | ospf3_put_prefix(buf, n, flags, cost); | |
70945cb6 OZ |
1348 | } |
1349 | ||
1350 | static void | |
1351 | prepare_link_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa) | |
c3226991 | 1352 | { |
d3f4f92b | 1353 | ip_addr nh = ospf_is_ip4(p) ? IPA_NONE : ifa->addr->ip; |
c3226991 | 1354 | int i = 0; |
c3226991 | 1355 | |
d3f4f92b | 1356 | /* Preallocating space for header */ |
70945cb6 | 1357 | ASSERT(p->lsab_used == 0); |
d3f4f92b | 1358 | lsab_allocz(p, sizeof(struct ospf_lsa_link)); |
c3226991 OZ |
1359 | |
1360 | struct ifa *a; | |
1361 | WALK_LIST(a, ifa->iface->addrs) | |
70945cb6 | 1362 | { |
d3f4f92b | 1363 | if ((a->prefix.type != ospf_get_af(p)) || |
d44e686e OZ |
1364 | (a->flags & IA_SECONDARY) || |
1365 | (a->scope <= SCOPE_LINK)) | |
70945cb6 | 1366 | continue; |
c3226991 | 1367 | |
d3f4f92b OZ |
1368 | if (ospf_is_ip4(p) && ipa_zero(nh)) |
1369 | nh = a->ip; | |
1370 | ||
d44e686e | 1371 | lsab_put_prefix(p, &a->prefix, 0); |
70945cb6 OZ |
1372 | i++; |
1373 | } | |
c3226991 | 1374 | |
d3f4f92b OZ |
1375 | /* Filling the preallocated header */ |
1376 | struct ospf_lsa_link *ll = p->lsab; | |
1377 | ll->options = ifa->oa->options | (ifa->priority << 24); | |
1378 | ll->lladdr = ospf_is_ip4(p) ? ospf3_4to6(ipa_to_ip4(nh)) : ipa_to_ip6(nh); | |
c3226991 | 1379 | ll->pxcount = i; |
d3f4f92b OZ |
1380 | |
1381 | if (ipa_zero(nh)) | |
1382 | log(L_ERR "%s: Cannot find next hop address for %s", p->p.name, ifa->ifname); | |
c3226991 OZ |
1383 | } |
1384 | ||
70945cb6 OZ |
1385 | static void |
1386 | ospf_originate_link_lsa(struct ospf_proto *p, struct ospf_iface *ifa) | |
c3226991 | 1387 | { |
70945cb6 | 1388 | if (ospf_is_v2(p)) |
48e5f32d OZ |
1389 | return; |
1390 | ||
70945cb6 OZ |
1391 | struct ospf_new_lsa lsa = { |
1392 | .type = LSA_T_LINK, | |
1393 | .dom = ifa->iface_id, | |
1394 | .id = ifa->iface_id, | |
1395 | .ifa = ifa | |
1396 | }; | |
c3226991 | 1397 | |
a7a7372a OZ |
1398 | OSPF_TRACE(D_EVENTS, "Updating link state for %s (Id: %R)", ifa->ifname, lsa.id); |
1399 | ||
70945cb6 | 1400 | prepare_link_lsa_body(p, ifa); |
be862406 | 1401 | |
70945cb6 | 1402 | ifa->link_lsa = ospf_originate_lsa(p, &lsa); |
c3226991 OZ |
1403 | } |
1404 | ||
1405 | ||
70945cb6 OZ |
1406 | /* |
1407 | * Prefix-Rt-LSA handling (assume OSPFv3) | |
1408 | * Type = LSA_T_PREFIX, referred type = LSA_T_RT | |
1409 | */ | |
d9e7e1b1 | 1410 | |
70945cb6 OZ |
1411 | static void |
1412 | prepare_prefix_rt_lsa_body(struct ospf_proto *p, struct ospf_area *oa) | |
c3226991 | 1413 | { |
70945cb6 | 1414 | struct ospf_config *cf = (struct ospf_config *) (p->p.cf); |
c3226991 OZ |
1415 | struct ospf_iface *ifa; |
1416 | struct ospf_lsa_prefix *lp; | |
3b89a232 | 1417 | int host_addr = 0; |
c3226991 OZ |
1418 | int net_lsa; |
1419 | int i = 0; | |
c3226991 | 1420 | |
70945cb6 OZ |
1421 | ASSERT(p->lsab_used == 0); |
1422 | lp = lsab_allocz(p, sizeof(struct ospf_lsa_prefix)); | |
c3226991 OZ |
1423 | lp->ref_type = LSA_T_RT; |
1424 | lp->ref_id = 0; | |
70945cb6 | 1425 | lp->ref_rt = p->router_id; |
c3226991 OZ |
1426 | lp = NULL; /* buffer might be reallocated later */ |
1427 | ||
70945cb6 | 1428 | WALK_LIST(ifa, p->iface_list) |
c3226991 | 1429 | { |
e4404cef | 1430 | if ((ifa->oa != oa) || (ifa->type == OSPF_IT_VLINK) || (ifa->state == OSPF_IS_DOWN)) |
c3226991 OZ |
1431 | continue; |
1432 | ||
e7b4948c OZ |
1433 | ifa->px_pos_beg = i; |
1434 | ||
c3226991 OZ |
1435 | if ((ifa->type == OSPF_IT_BCAST) || |
1436 | (ifa->type == OSPF_IT_NBMA)) | |
1437 | net_lsa = bcast_net_active(ifa); | |
1438 | else | |
1439 | net_lsa = 0; | |
1440 | ||
1441 | struct ifa *a; | |
1442 | WALK_LIST(a, ifa->iface->addrs) | |
70945cb6 | 1443 | { |
d3f4f92b | 1444 | if ((a->prefix.type != ospf_get_af(p)) || |
d44e686e | 1445 | (a->flags & IA_SECONDARY) || |
70945cb6 OZ |
1446 | (a->flags & IA_PEER) || |
1447 | (a->scope <= SCOPE_LINK)) | |
1448 | continue; | |
3b89a232 | 1449 | |
d44e686e | 1450 | if (((a->prefix.pxlen < IP6_MAX_PREFIX_LENGTH) && net_lsa) || |
70945cb6 OZ |
1451 | configured_stubnet(oa, a)) |
1452 | continue; | |
c3226991 | 1453 | |
70945cb6 OZ |
1454 | if ((a->flags & IA_HOST) || |
1455 | (ifa->state == OSPF_IS_LOOP) || | |
1456 | (ifa->type == OSPF_IT_PTMP)) | |
1457 | { | |
d44e686e OZ |
1458 | net_addr_ip6 net = NET_ADDR_IP6(a->ip, IP6_MAX_PREFIX_LENGTH); |
1459 | lsab_put_prefix(p, (net_addr *) &net, 0); | |
70945cb6 | 1460 | host_addr = 1; |
c3226991 | 1461 | } |
70945cb6 | 1462 | else |
d44e686e | 1463 | lsab_put_prefix(p, &a->prefix, ifa->cost); |
70945cb6 OZ |
1464 | i++; |
1465 | } | |
e7b4948c OZ |
1466 | |
1467 | ifa->px_pos_end = i; | |
c3226991 OZ |
1468 | } |
1469 | ||
c3226991 | 1470 | struct ospf_stubnet_config *sn; |
70945cb6 OZ |
1471 | WALK_LIST(sn, oa->ac->stubnet_list) |
1472 | if (!sn->hidden) | |
1473 | { | |
d44e686e OZ |
1474 | lsab_put_prefix(p, &sn->prefix, sn->cost); |
1475 | if (sn->prefix.pxlen == IP6_MAX_PREFIX_LENGTH) | |
70945cb6 OZ |
1476 | host_addr = 1; |
1477 | i++; | |
1478 | } | |
e4404cef OZ |
1479 | |
1480 | /* If there are some configured vlinks, find some global address | |
1481 | (even from another area), which will be used as a vlink endpoint. */ | |
d3f4f92b | 1482 | if (!EMPTY_LIST(cf->vlink_list) && !host_addr && ospf_is_ip6(p)) |
e4404cef | 1483 | { |
70945cb6 | 1484 | WALK_LIST(ifa, p->iface_list) |
e4404cef OZ |
1485 | { |
1486 | if ((ifa->type == OSPF_IT_VLINK) || (ifa->state == OSPF_IS_DOWN)) | |
1487 | continue; | |
1488 | ||
1489 | struct ifa *a; | |
1490 | WALK_LIST(a, ifa->iface->addrs) | |
1491 | { | |
d44e686e OZ |
1492 | if ((a->prefix.type != NET_IP6) || |
1493 | (a->flags & IA_SECONDARY) || | |
1494 | (a->scope <= SCOPE_LINK)) | |
e4404cef OZ |
1495 | continue; |
1496 | ||
1497 | /* Found some IP */ | |
d44e686e OZ |
1498 | net_addr_ip6 net = NET_ADDR_IP6(a->ip, IP6_MAX_PREFIX_LENGTH); |
1499 | lsab_put_prefix(p, (net_addr *) &net, 0); | |
c3226991 | 1500 | i++; |
e4404cef | 1501 | goto done; |
c3226991 | 1502 | } |
e4404cef OZ |
1503 | } |
1504 | } | |
c3226991 | 1505 | |
e4404cef | 1506 | done: |
70945cb6 | 1507 | lp = p->lsab; |
c3226991 | 1508 | lp->pxcount = i; |
c3226991 OZ |
1509 | } |
1510 | ||
70945cb6 OZ |
1511 | static void |
1512 | ospf_originate_prefix_rt_lsa(struct ospf_proto *p, struct ospf_area *oa) | |
c3226991 | 1513 | { |
70945cb6 OZ |
1514 | if (ospf_is_v2(p)) |
1515 | return; | |
c3226991 | 1516 | |
70945cb6 OZ |
1517 | struct ospf_new_lsa lsa = { |
1518 | .type = LSA_T_PREFIX, | |
1519 | .dom = oa->areaid, | |
1520 | .id = 0 | |
1521 | }; | |
be862406 | 1522 | |
70945cb6 | 1523 | prepare_prefix_rt_lsa_body(p, oa); |
c3226991 | 1524 | |
70945cb6 | 1525 | ospf_originate_lsa(p, &lsa); |
c3226991 OZ |
1526 | } |
1527 | ||
1528 | ||
70945cb6 OZ |
1529 | /* |
1530 | * Prefix-Net-LSA handling (assume OSPFv3) | |
1531 | * Type = LSA_T_PREFIX, referred type = LSA_T_NET | |
1532 | */ | |
1533 | ||
c3226991 OZ |
1534 | static inline int |
1535 | prefix_space(u32 *buf) | |
1536 | { | |
1537 | int pxl = *buf >> 24; | |
1538 | return IPV6_PREFIX_SPACE(pxl); | |
1539 | } | |
1540 | ||
1541 | static inline int | |
1542 | prefix_same(u32 *b1, u32 *b2) | |
1543 | { | |
1544 | int pxl1 = *b1 >> 24; | |
1545 | int pxl2 = *b2 >> 24; | |
1546 | int pxs, i; | |
742029eb | 1547 | |
c3226991 OZ |
1548 | if (pxl1 != pxl2) |
1549 | return 0; | |
1550 | ||
1551 | pxs = IPV6_PREFIX_WORDS(pxl1); | |
1552 | for (i = 1; i < pxs; i++) | |
1553 | if (b1[i] != b2[i]) | |
1554 | return 0; | |
1555 | ||
1556 | return 1; | |
1557 | } | |
1558 | ||
1559 | static inline u32 * | |
1560 | prefix_advance(u32 *buf) | |
1561 | { | |
be862406 OZ |
1562 | int pxl = *buf >> 24; |
1563 | return buf + IPV6_PREFIX_WORDS(pxl); | |
c3226991 OZ |
1564 | } |
1565 | ||
2918e610 | 1566 | /* FIXME eliminate items with LA bit set? see 4.4.3.9 */ |
c3226991 | 1567 | static void |
70945cb6 | 1568 | add_prefix(struct ospf_proto *p, u32 *px, int offset, int *pxc) |
c3226991 | 1569 | { |
70945cb6 | 1570 | u32 *pxl = lsab_offset(p, offset); |
c3226991 | 1571 | int i; |
e4404cef OZ |
1572 | for (i = 0; i < *pxc; pxl = prefix_advance(pxl), i++) |
1573 | if (prefix_same(px, pxl)) | |
c3226991 | 1574 | { |
e4404cef OZ |
1575 | /* Options should be logically OR'ed together */ |
1576 | *pxl |= (*px & 0x00FF0000); | |
1577 | return; | |
c3226991 OZ |
1578 | } |
1579 | ||
70945cb6 | 1580 | ASSERT(pxl == lsab_end(p)); |
c3226991 OZ |
1581 | |
1582 | int pxspace = prefix_space(px); | |
70945cb6 | 1583 | pxl = lsab_alloc(p, pxspace); |
c3226991 | 1584 | memcpy(pxl, px, pxspace); |
e4404cef | 1585 | *pxl &= 0xFFFF0000; /* Set metric to zero */ |
c3226991 OZ |
1586 | (*pxc)++; |
1587 | } | |
1588 | ||
be862406 | 1589 | static void |
70945cb6 | 1590 | add_link_lsa(struct ospf_proto *p, struct ospf_lsa_link *ll, int offset, int *pxc) |
be862406 | 1591 | { |
be862406 | 1592 | u32 *pxb = ll->rest; |
3e236955 | 1593 | uint j; |
be862406 | 1594 | |
e4404cef OZ |
1595 | for (j = 0; j < ll->pxcount; pxb = prefix_advance(pxb), j++) |
1596 | { | |
1597 | u8 pxlen = (pxb[0] >> 24); | |
1598 | u8 pxopts = (pxb[0] >> 16); | |
1599 | ||
1600 | /* Skip NU or LA prefixes */ | |
1601 | if (pxopts & (OPT_PX_NU | OPT_PX_LA)) | |
1602 | continue; | |
1603 | ||
1604 | /* Skip link-local prefixes */ | |
d3f4f92b | 1605 | if (ospf_is_ip6(p) && (pxlen >= 10) && ((pxb[1] & 0xffc00000) == 0xfe800000)) |
e4404cef OZ |
1606 | continue; |
1607 | ||
70945cb6 | 1608 | add_prefix(p, pxb, offset, pxc); |
e4404cef | 1609 | } |
be862406 OZ |
1610 | } |
1611 | ||
70945cb6 OZ |
1612 | static void |
1613 | prepare_prefix_net_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa) | |
c3226991 | 1614 | { |
c3226991 | 1615 | struct ospf_lsa_prefix *lp; |
c3226991 OZ |
1616 | struct ospf_neighbor *n; |
1617 | struct top_hash_entry *en; | |
be862406 | 1618 | int pxc, offset; |
c3226991 | 1619 | |
70945cb6 OZ |
1620 | ASSERT(p->lsab_used == 0); |
1621 | lp = lsab_allocz(p, sizeof(struct ospf_lsa_prefix)); | |
c3226991 OZ |
1622 | lp->ref_type = LSA_T_NET; |
1623 | lp->ref_id = ifa->net_lsa->lsa.id; | |
70945cb6 | 1624 | lp->ref_rt = p->router_id; |
c3226991 OZ |
1625 | lp = NULL; /* buffer might be reallocated later */ |
1626 | ||
be862406 | 1627 | pxc = 0; |
70945cb6 | 1628 | offset = p->lsab_used; |
c3226991 | 1629 | |
be862406 | 1630 | /* Find all Link LSAs associated with the link and merge their prefixes */ |
70945cb6 OZ |
1631 | if (en = ifa->link_lsa) |
1632 | add_link_lsa(p, en->next_lsa_body ?: en->lsa_body, offset, &pxc); | |
be862406 | 1633 | |
c3226991 OZ |
1634 | WALK_LIST(n, ifa->neigh_list) |
1635 | if ((n->state == NEIGHBOR_FULL) && | |
742029eb | 1636 | (en = ospf_hash_find(p->gr, ifa->iface_id, n->iface_id, n->rid, LSA_T_LINK))) |
70945cb6 | 1637 | add_link_lsa(p, en->lsa_body, offset, &pxc); |
c3226991 | 1638 | |
70945cb6 | 1639 | lp = p->lsab; |
be862406 | 1640 | lp->pxcount = pxc; |
c3226991 OZ |
1641 | } |
1642 | ||
70945cb6 OZ |
1643 | static void |
1644 | ospf_originate_prefix_net_lsa(struct ospf_proto *p, struct ospf_iface *ifa) | |
c3226991 | 1645 | { |
70945cb6 OZ |
1646 | if (ospf_is_v2(p)) |
1647 | return; | |
c3226991 | 1648 | |
70945cb6 OZ |
1649 | struct ospf_new_lsa lsa = { |
1650 | .type = LSA_T_PREFIX, | |
1651 | .dom = ifa->oa->areaid, | |
1652 | .id = ifa->iface_id, | |
1653 | .ifa = ifa | |
1654 | }; | |
be862406 | 1655 | |
70945cb6 | 1656 | prepare_prefix_net_lsa_body(p, ifa); |
c3226991 | 1657 | |
70945cb6 | 1658 | ifa->pxn_lsa = ospf_originate_lsa(p, &lsa); |
c3226991 OZ |
1659 | } |
1660 | ||
a7a7372a | 1661 | static inline int breaks_minlsinterval(struct top_hash_entry *en) |
b32d557a | 1662 | { return en && (en->lsa.age < LSA_MAXAGE) && (lsa_inst_age(en) < MINLSINTERVAL); } |
70945cb6 | 1663 | |
061ab802 | 1664 | void |
70945cb6 | 1665 | ospf_update_topology(struct ospf_proto *p) |
061ab802 | 1666 | { |
70945cb6 OZ |
1667 | struct ospf_area *oa; |
1668 | struct ospf_iface *ifa; | |
061ab802 | 1669 | |
70945cb6 OZ |
1670 | WALK_LIST(oa, p->area_list) |
1671 | { | |
1672 | if (oa->update_rt_lsa) | |
1673 | { | |
a7a7372a OZ |
1674 | /* |
1675 | * Generally, MinLSInterval is enforced in ospf_do_originate_lsa(), but | |
1676 | * origination of (prefix) router LSA is a special case. We do not want to | |
1677 | * prepare a new router LSA body and then postpone it in en->next_lsa_body | |
1678 | * for later origination, because there are side effects (updates of | |
1679 | * rt_pos_* and px_pos_* in ospf_iface structures) during that, which may | |
1680 | * confuse routing table calculation if executed after LSA body | |
1681 | * preparation but before final LSA origination (as rtcalc would use | |
1682 | * current rt_pos_* indexes but the old router LSA body). | |
1683 | * | |
1684 | * Here, we ensure that MinLSInterval is observed and we do not even try | |
1685 | * to originate these LSAs if it is not. Therefore, origination, when | |
1686 | * requested, will succeed unless there is also a seqnum wrapping, which | |
1687 | * is not a problem because in that case rtcalc is blocked by MaxAge. | |
1688 | */ | |
1689 | ||
1690 | if (breaks_minlsinterval(oa->rt) || breaks_minlsinterval(oa->pxr_lsa)) | |
1691 | continue; | |
1692 | ||
70945cb6 OZ |
1693 | ospf_originate_rt_lsa(p, oa); |
1694 | ospf_originate_prefix_rt_lsa(p, oa); | |
1695 | oa->update_rt_lsa = 0; | |
1696 | } | |
1697 | } | |
061ab802 | 1698 | |
70945cb6 OZ |
1699 | WALK_LIST(ifa, p->iface_list) |
1700 | { | |
1701 | if (ifa->type == OSPF_IT_VLINK) | |
1702 | continue; | |
be862406 | 1703 | |
70945cb6 OZ |
1704 | if (ifa->update_link_lsa) |
1705 | { | |
1706 | if ((ifa->state > OSPF_IS_LOOP) && !ifa->link_lsa_suppression) | |
1707 | ospf_originate_link_lsa(p, ifa); | |
1708 | else | |
1709 | ospf_flush2_lsa(p, &ifa->link_lsa); | |
061ab802 | 1710 | |
70945cb6 OZ |
1711 | ifa->update_link_lsa = 0; |
1712 | } | |
061ab802 | 1713 | |
70945cb6 OZ |
1714 | if (ifa->update_net_lsa) |
1715 | { | |
1716 | if ((ifa->state == OSPF_IS_DR) && (ifa->fadj > 0)) | |
1717 | { | |
1718 | ospf_originate_net_lsa(p, ifa); | |
1719 | ospf_originate_prefix_net_lsa(p, ifa); | |
1720 | } | |
1721 | else | |
1722 | { | |
1723 | ospf_flush2_lsa(p, &ifa->net_lsa); | |
1724 | ospf_flush2_lsa(p, &ifa->pxn_lsa); | |
1725 | } | |
1726 | ||
1727 | ifa->update_net_lsa = 0; | |
1728 | } | |
1729 | } | |
70945cb6 | 1730 | } |
e8085aba | 1731 | |
b49e6f5a | 1732 | |
6ba36f06 MM |
1733 | static void |
1734 | ospf_top_ht_alloc(struct top_graph *f) | |
1735 | { | |
1736 | f->hash_size = 1 << f->hash_order; | |
1737 | f->hash_mask = f->hash_size - 1; | |
1738 | if (f->hash_order > HASH_HI_MAX - HASH_HI_STEP) | |
1739 | f->hash_entries_max = ~0; | |
1740 | else | |
1741 | f->hash_entries_max = f->hash_size HASH_HI_MARK; | |
1742 | if (f->hash_order < HASH_LO_MIN + HASH_LO_STEP) | |
1743 | f->hash_entries_min = 0; | |
1744 | else | |
1745 | f->hash_entries_min = f->hash_size HASH_LO_MARK; | |
1746 | DBG("Allocating OSPF hash of order %d: %d hash_entries, %d low, %d high\n", | |
1747 | f->hash_order, f->hash_size, f->hash_entries_min, f->hash_entries_max); | |
b9ed99f7 OF |
1748 | f->hash_table = |
1749 | mb_alloc(f->pool, f->hash_size * sizeof(struct top_hash_entry *)); | |
6ba36f06 MM |
1750 | bzero(f->hash_table, f->hash_size * sizeof(struct top_hash_entry *)); |
1751 | } | |
1752 | ||
1753 | static inline void | |
1754 | ospf_top_ht_free(struct top_hash_entry **h) | |
1755 | { | |
1756 | mb_free(h); | |
1757 | } | |
1758 | ||
1759 | static inline u32 | |
1760 | ospf_top_hash_u32(u32 a) | |
1761 | { | |
1762 | /* Shamelessly stolen from IP address hashing in ipv4.h */ | |
1763 | a ^= a >> 16; | |
1764 | a ^= a << 10; | |
1765 | return a; | |
1766 | } | |
1767 | ||
a7a7372a | 1768 | static uint |
c3226991 OZ |
1769 | ospf_top_hash(struct top_graph *f, u32 domain, u32 lsaid, u32 rtrid, u32 type) |
1770 | { | |
be862406 | 1771 | /* In OSPFv2, we don't know Router ID when looking for network LSAs. |
9f0ba7b1 OZ |
1772 | In OSPFv3, we don't know LSA ID when looking for router LSAs. |
1773 | In both cases, there is (usually) just one (or small number) | |
1774 | appropriate LSA, so we just clear unknown part of key. */ | |
c3226991 | 1775 | |
70945cb6 OZ |
1776 | return (((f->ospf2 && (type == LSA_T_NET)) ? 0 : ospf_top_hash_u32(rtrid)) + |
1777 | ((!f->ospf2 && (type == LSA_T_RT)) ? 0 : ospf_top_hash_u32(lsaid)) + | |
9f0ba7b1 | 1778 | type + domain) & f->hash_mask; |
c3226991 OZ |
1779 | |
1780 | /* | |
b9ed99f7 | 1781 | return (ospf_top_hash_u32(lsaid) + ospf_top_hash_u32(rtrid) + |
86c84d76 | 1782 | type + areaid) & f->hash_mask; |
c3226991 | 1783 | */ |
6ba36f06 MM |
1784 | } |
1785 | ||
7ab3ff6a OF |
1786 | /** |
1787 | * ospf_top_new - allocated new topology database | |
70945cb6 | 1788 | * @p: OSPF protocol instance |
a7a7372a | 1789 | * @pool: pool for allocation |
7ab3ff6a | 1790 | * |
a7a7372a OZ |
1791 | * This dynamically hashed structure is used for keeping LSAs. Mainly it is used |
1792 | * for the LSA database of the OSPF protocol, but also for LSA retransmission | |
1793 | * and request lists of OSPF neighbors. | |
7ab3ff6a | 1794 | */ |
6ba36f06 | 1795 | struct top_graph * |
a7a7372a | 1796 | ospf_top_new(struct ospf_proto *p, pool *pool) |
6ba36f06 MM |
1797 | { |
1798 | struct top_graph *f; | |
1799 | ||
035f6acb OF |
1800 | f = mb_allocz(pool, sizeof(struct top_graph)); |
1801 | f->pool = pool; | |
6ba36f06 MM |
1802 | f->hash_slab = sl_new(f->pool, sizeof(struct top_hash_entry)); |
1803 | f->hash_order = HASH_DEF_ORDER; | |
1804 | ospf_top_ht_alloc(f); | |
1805 | f->hash_entries = 0; | |
1806 | f->hash_entries_min = 0; | |
a7a7372a | 1807 | f->ospf2 = ospf_is_v2(p); |
6ba36f06 MM |
1808 | return f; |
1809 | } | |
1810 | ||
1811 | void | |
1812 | ospf_top_free(struct top_graph *f) | |
1813 | { | |
1814 | rfree(f->hash_slab); | |
1815 | ospf_top_ht_free(f->hash_table); | |
1816 | mb_free(f); | |
1817 | } | |
1818 | ||
1819 | static void | |
1820 | ospf_top_rehash(struct top_graph *f, int step) | |
1821 | { | |
6ba36f06 | 1822 | struct top_hash_entry **n, **oldt, **newt, *e, *x; |
a7a7372a | 1823 | uint oldn, oldh; |
6ba36f06 MM |
1824 | |
1825 | oldn = f->hash_size; | |
1826 | oldt = f->hash_table; | |
b49e6f5a | 1827 | DBG("re-hashing topology hash from order %d to %d\n", f->hash_order, |
b9ed99f7 | 1828 | f->hash_order + step); |
6ba36f06 MM |
1829 | f->hash_order += step; |
1830 | ospf_top_ht_alloc(f); | |
1831 | newt = f->hash_table; | |
1832 | ||
b9ed99f7 OF |
1833 | for (oldh = 0; oldh < oldn; oldh++) |
1834 | { | |
1835 | e = oldt[oldh]; | |
1836 | while (e) | |
6ba36f06 | 1837 | { |
b9ed99f7 | 1838 | x = e->next; |
70945cb6 | 1839 | n = newt + ospf_top_hash(f, e->domain, e->lsa.id, e->lsa.rt, e->lsa_type); |
b9ed99f7 OF |
1840 | e->next = *n; |
1841 | *n = e; | |
1842 | e = x; | |
6ba36f06 | 1843 | } |
b9ed99f7 | 1844 | } |
6ba36f06 MM |
1845 | ospf_top_ht_free(oldt); |
1846 | } | |
1847 | ||
6f8bbaa1 OZ |
1848 | static struct top_hash_entry * |
1849 | ospf_hash_find_(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type) | |
6ba36f06 | 1850 | { |
86c84d76 | 1851 | struct top_hash_entry *e; |
c3226991 | 1852 | e = f->hash_table[ospf_top_hash(f, domain, lsa, rtr, type)]; |
86c84d76 | 1853 | |
70945cb6 OZ |
1854 | while (e && (e->lsa.id != lsa || e->lsa.rt != rtr || |
1855 | e->lsa_type != type || e->domain != domain)) | |
9f0ba7b1 OZ |
1856 | e = e->next; |
1857 | ||
6f8bbaa1 OZ |
1858 | return e; |
1859 | } | |
1860 | ||
1861 | struct top_hash_entry * | |
1862 | ospf_hash_find(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type) | |
1863 | { | |
1864 | struct top_hash_entry *e = ospf_hash_find_(f, domain, lsa, rtr, type); | |
1865 | ||
70945cb6 | 1866 | /* Hide hash entry with empty lsa_body */ |
a7a7372a | 1867 | return (e && e->lsa_body) ? e : NULL; |
9f0ba7b1 | 1868 | } |
86c84d76 | 1869 | |
70945cb6 OZ |
1870 | /* In OSPFv2, lsa.id is the same as lsa.rt for router LSA. In OSPFv3, we don't know |
1871 | lsa.id when looking for router LSAs. We return matching LSA with smallest lsa.id. */ | |
9f0ba7b1 OZ |
1872 | struct top_hash_entry * |
1873 | ospf_hash_find_rt(struct top_graph *f, u32 domain, u32 rtr) | |
1874 | { | |
1875 | struct top_hash_entry *rv = NULL; | |
1876 | struct top_hash_entry *e; | |
70945cb6 OZ |
1877 | /* We can put rtr for lsa.id to hash fn, it is ignored in OSPFv3 */ |
1878 | e = f->hash_table[ospf_top_hash(f, domain, rtr, rtr, LSA_T_RT)]; | |
1879 | ||
9f0ba7b1 | 1880 | while (e) |
70945cb6 OZ |
1881 | { |
1882 | if (e->lsa.rt == rtr && e->lsa_type == LSA_T_RT && e->domain == domain && e->lsa_body) | |
9f0ba7b1 | 1883 | { |
70945cb6 OZ |
1884 | if (f->ospf2 && (e->lsa.id == rtr)) |
1885 | return e; | |
1886 | if (!f->ospf2 && (!rv || e->lsa.id < rv->lsa.id)) | |
1887 | rv = e; | |
9f0ba7b1 | 1888 | } |
70945cb6 OZ |
1889 | e = e->next; |
1890 | } | |
9f0ba7b1 OZ |
1891 | |
1892 | return rv; | |
1893 | } | |
1894 | ||
a7a7372a OZ |
1895 | /* |
1896 | * ospf_hash_find_rt3_first() and ospf_hash_find_rt3_next() are used exclusively | |
1897 | * for lsa_walk_rt_init(), lsa_walk_rt(), therefore they skip MaxAge entries. | |
1898 | */ | |
9f0ba7b1 | 1899 | static inline struct top_hash_entry * |
70945cb6 | 1900 | find_matching_rt3(struct top_hash_entry *e, u32 domain, u32 rtr) |
9f0ba7b1 | 1901 | { |
70945cb6 | 1902 | while (e && (e->lsa.rt != rtr || e->lsa_type != LSA_T_RT || |
a7a7372a | 1903 | e->domain != domain || e->lsa.age == LSA_MAXAGE)) |
9f0ba7b1 | 1904 | e = e->next; |
6ba36f06 MM |
1905 | return e; |
1906 | } | |
1907 | ||
9f0ba7b1 | 1908 | struct top_hash_entry * |
70945cb6 | 1909 | ospf_hash_find_rt3_first(struct top_graph *f, u32 domain, u32 rtr) |
9f0ba7b1 OZ |
1910 | { |
1911 | struct top_hash_entry *e; | |
1912 | e = f->hash_table[ospf_top_hash(f, domain, 0, rtr, LSA_T_RT)]; | |
70945cb6 | 1913 | return find_matching_rt3(e, domain, rtr); |
9f0ba7b1 OZ |
1914 | } |
1915 | ||
1916 | struct top_hash_entry * | |
70945cb6 | 1917 | ospf_hash_find_rt3_next(struct top_hash_entry *e) |
9f0ba7b1 | 1918 | { |
70945cb6 | 1919 | return find_matching_rt3(e->next, e->domain, e->lsa.rt); |
9f0ba7b1 OZ |
1920 | } |
1921 | ||
70945cb6 OZ |
1922 | /* In OSPFv2, we don't know Router ID when looking for network LSAs. |
1923 | There should be just one, so we find any match. */ | |
1924 | struct top_hash_entry * | |
1925 | ospf_hash_find_net2(struct top_graph *f, u32 domain, u32 id) | |
1926 | { | |
1927 | struct top_hash_entry *e; | |
1928 | e = f->hash_table[ospf_top_hash(f, domain, id, 0, LSA_T_NET)]; | |
1929 | ||
1930 | while (e && (e->lsa.id != id || e->lsa_type != LSA_T_NET || | |
1931 | e->domain != domain || e->lsa_body == NULL)) | |
1932 | e = e->next; | |
1933 | ||
1934 | return e; | |
1935 | } | |
9f0ba7b1 OZ |
1936 | |
1937 | ||
6ba36f06 | 1938 | struct top_hash_entry * |
b49e6f5a | 1939 | ospf_hash_get(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type) |
6ba36f06 | 1940 | { |
86c84d76 OF |
1941 | struct top_hash_entry **ee; |
1942 | struct top_hash_entry *e; | |
86c84d76 | 1943 | |
c3226991 | 1944 | ee = f->hash_table + ospf_top_hash(f, domain, lsa, rtr, type); |
86c84d76 OF |
1945 | e = *ee; |
1946 | ||
742029eb | 1947 | while (e && (e->lsa.id != lsa || e->lsa.rt != rtr || |
70945cb6 | 1948 | e->lsa_type != type || e->domain != domain)) |
c3226991 | 1949 | e = e->next; |
6ba36f06 | 1950 | |
6ba36f06 MM |
1951 | if (e) |
1952 | return e; | |
933bfdde | 1953 | |
6ba36f06 | 1954 | e = sl_alloc(f->hash_slab); |
70945cb6 OZ |
1955 | bzero(e, sizeof(struct top_hash_entry)); |
1956 | ||
933bfdde OF |
1957 | e->color = OUTSPF; |
1958 | e->dist = LSINFINITY; | |
70945cb6 | 1959 | e->lsa.type_raw = type; |
ce17d4c1 OF |
1960 | e->lsa.id = lsa; |
1961 | e->lsa.rt = rtr; | |
70945cb6 OZ |
1962 | e->lsa.sn = LSA_ZEROSEQNO; |
1963 | e->lsa_type = type; | |
c3226991 | 1964 | e->domain = domain; |
933bfdde | 1965 | e->next = *ee; |
b9ed99f7 | 1966 | *ee = e; |
6ba36f06 MM |
1967 | if (f->hash_entries++ > f->hash_entries_max) |
1968 | ospf_top_rehash(f, HASH_HI_STEP); | |
1969 | return e; | |
1970 | } | |
1971 | ||
1972 | void | |
1973 | ospf_hash_delete(struct top_graph *f, struct top_hash_entry *e) | |
1974 | { | |
742029eb | 1975 | struct top_hash_entry **ee = f->hash_table + |
70945cb6 | 1976 | ospf_top_hash(f, e->domain, e->lsa.id, e->lsa.rt, e->lsa_type); |
6ba36f06 MM |
1977 | |
1978 | while (*ee) | |
b9ed99f7 OF |
1979 | { |
1980 | if (*ee == e) | |
6ba36f06 | 1981 | { |
b9ed99f7 OF |
1982 | *ee = e->next; |
1983 | sl_free(f->hash_slab, e); | |
1984 | if (f->hash_entries-- < f->hash_entries_min) | |
1985 | ospf_top_rehash(f, -HASH_LO_STEP); | |
1986 | return; | |
6ba36f06 | 1987 | } |
b9ed99f7 OF |
1988 | ee = &((*ee)->next); |
1989 | } | |
6ba36f06 MM |
1990 | bug("ospf_hash_delete() called for invalid node"); |
1991 | } | |
1992 | ||
e81b440f | 1993 | /* |
226cb2bc OF |
1994 | static void |
1995 | ospf_dump_lsa(struct top_hash_entry *he, struct proto *p) | |
1996 | { | |
e81b440f | 1997 | |
226cb2bc OF |
1998 | struct ospf_lsa_rt *rt = NULL; |
1999 | struct ospf_lsa_rt_link *rr = NULL; | |
2000 | struct ospf_lsa_net *ln = NULL; | |
2001 | u32 *rts = NULL; | |
2002 | u32 i, max; | |
2003 | ||
3aab39f5 OZ |
2004 | OSPF_TRACE(D_EVENTS, "- %1x %-1R %-1R %4u 0x%08x 0x%04x %-1R", |
2005 | he->lsa.type, he->lsa.id, he->lsa.rt, he->lsa.age, he->lsa.sn, | |
c3226991 | 2006 | he->lsa.checksum, he->domain); |
226cb2bc | 2007 | |
b49e6f5a | 2008 | |
226cb2bc OF |
2009 | switch (he->lsa.type) |
2010 | { | |
2011 | case LSA_T_RT: | |
2012 | rt = he->lsa_body; | |
2013 | rr = (struct ospf_lsa_rt_link *) (rt + 1); | |
2014 | ||
c3226991 | 2015 | for (i = 0; i < lsa_rt_items(&he->lsa); i++) |
742029eb | 2016 | OSPF_TRACE(D_EVENTS, " - %1x %-1R %-1R %5u", |
3aab39f5 | 2017 | rr[i].type, rr[i].id, rr[i].data, rr[i].metric); |
226cb2bc OF |
2018 | break; |
2019 | ||
2020 | case LSA_T_NET: | |
2021 | ln = he->lsa_body; | |
2022 | rts = (u32 *) (ln + 1); | |
226cb2bc | 2023 | |
c3226991 | 2024 | for (i = 0; i < lsa_net_items(&he->lsa); i++) |
742029eb | 2025 | OSPF_TRACE(D_EVENTS, " - %-1R", rts[i]); |
226cb2bc OF |
2026 | break; |
2027 | ||
2028 | default: | |
2029 | break; | |
2030 | } | |
2031 | } | |
2032 | ||
6ba36f06 | 2033 | void |
992705f6 | 2034 | ospf_top_dump(struct top_graph *f, struct proto *p) |
6ba36f06 | 2035 | { |
a7a7372a | 2036 | uint i; |
992705f6 | 2037 | OSPF_TRACE(D_EVENTS, "Hash entries: %d", f->hash_entries); |
6ba36f06 | 2038 | |
b9ed99f7 OF |
2039 | for (i = 0; i < f->hash_size; i++) |
2040 | { | |
226cb2bc OF |
2041 | struct top_hash_entry *e; |
2042 | for (e = f->hash_table[i]; e != NULL; e = e->next) | |
2043 | ospf_dump_lsa(e, p); | |
b9ed99f7 | 2044 | } |
6ba36f06 | 2045 | } |
e81b440f | 2046 | */ |