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Commit | Line | Data |
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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; | |
73 | en->inst_time = now; | |
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; | |
131 | en->inst_time = now; | |
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; | |
163 | en->inst_time = now; | |
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 OZ |
198 | /* Enforce MinLSInterval */ |
199 | if ((en->init_age == 0) && en->inst_time && ((en->inst_time + MINLSINTERVAL) > now)) | |
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; | |
240 | en->inst_time = now; | |
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; | |
384 | en->inst_time = now; | |
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 | { | |
70945cb6 OZ |
407 | if (en->next_lsa_body) |
408 | { | |
409 | mb_free(en->next_lsa_body); | |
410 | en->next_lsa_body = NULL; | |
411 | en->next_lsa_blen = 0; | |
412 | en->next_lsa_opts = 0; | |
413 | } | |
414 | ||
415 | if (en->lsa.age == LSA_MAXAGE) | |
416 | return; | |
417 | ||
6f8bbaa1 OZ |
418 | OSPF_TRACE(D_EVENTS, "Flushing LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x", |
419 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn); | |
420 | ||
70945cb6 | 421 | en->lsa.age = LSA_MAXAGE; |
a7a7372a OZ |
422 | ospf_flood_lsa(p, en, NULL); |
423 | ||
424 | if (en->mode == LSA_M_BASIC) | |
425 | ospf_schedule_rtcalc(p); | |
426 | ||
427 | en->mode = LSA_M_BASIC; | |
70945cb6 OZ |
428 | } |
429 | ||
430 | static void | |
431 | ospf_clear_lsa(struct ospf_proto *p, struct top_hash_entry *en) | |
432 | { | |
433 | /* | |
434 | * Called by ospf_update_lsadb() as part of LSA flushing process. | |
435 | * Flushed LSA was acknowledged by neighbors and we can free its content. | |
6f8bbaa1 | 436 | * The log message is for 'remove' - we hide empty LSAs from users. |
70945cb6 OZ |
437 | */ |
438 | ||
6f8bbaa1 OZ |
439 | OSPF_TRACE(D_EVENTS, "Removing LSA: Type: %04x, Id: %R, Rt: %R, Seq: %08x", |
440 | en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn); | |
441 | ||
70945cb6 OZ |
442 | if (en->lsa.sn == LSA_MAXSEQNO) |
443 | en->lsa.sn = LSA_ZEROSEQNO; | |
444 | ||
445 | mb_free(en->lsa_body); | |
446 | en->lsa_body = NULL; | |
447 | } | |
448 | ||
449 | static void | |
450 | ospf_remove_lsa(struct ospf_proto *p, struct top_hash_entry *en) | |
451 | { | |
452 | /* | |
453 | * Called by ospf_update_lsadb() as part of LSA flushing process. | |
454 | * Both lsa_body and next_lsa_body are NULL. | |
455 | */ | |
456 | ||
457 | s_rem_node(SNODE en); | |
458 | ospf_hash_delete(p->gr, en); | |
459 | } | |
460 | ||
461 | /** | |
462 | * ospf_update_lsadb - update LSA database | |
463 | * @p: OSPF protocol instance | |
464 | * | |
465 | * This function is periodicaly invoked from ospf_disp(). It does some periodic | |
466 | * or postponed processing related to LSA entries. It originates postponed LSAs | |
467 | * scheduled by ospf_originate_lsa(), It continues in flushing processes started | |
468 | * by ospf_flush_lsa(). It also periodically refreshs locally originated LSAs -- | |
469 | * when the current instance is older %LSREFRESHTIME, a new instance is originated. | |
470 | * Finally, it also ages stored LSAs and flushes ones that reached %LSA_MAXAGE. | |
471 | * | |
472 | * The RFC 2328 says that a router should periodically check checksums of all | |
473 | * stored LSAs to detect hardware problems. This is not implemented. | |
474 | */ | |
475 | void | |
476 | ospf_update_lsadb(struct ospf_proto *p) | |
477 | { | |
478 | struct top_hash_entry *en, *nxt; | |
479 | bird_clock_t real_age; | |
480 | ||
481 | WALK_SLIST_DELSAFE(en, nxt, p->lsal) | |
482 | { | |
483 | if (en->next_lsa_body) | |
484 | ospf_originate_next_lsa(p, en); | |
485 | ||
486 | real_age = en->init_age + (now - en->inst_time); | |
487 | ||
488 | if (en->lsa.age == LSA_MAXAGE) | |
489 | { | |
490 | if (en->lsa_body && (p->padj == 0) && (en->ret_count == 0)) | |
491 | ospf_clear_lsa(p, en); | |
492 | ||
493 | if ((en->lsa_body == NULL) && (en->next_lsa_body == NULL) && | |
494 | ((en->lsa.rt != p->router_id) || (real_age >= LSA_MAXAGE))) | |
495 | ospf_remove_lsa(p, en); | |
496 | ||
497 | continue; | |
498 | } | |
499 | ||
500 | if ((en->lsa.rt == p->router_id) && (real_age >= LSREFRESHTIME)) | |
501 | { | |
502 | ospf_refresh_lsa(p, en); | |
503 | continue; | |
504 | } | |
505 | ||
506 | if (real_age >= LSA_MAXAGE) | |
3d15dcdb | 507 | { |
70945cb6 | 508 | ospf_flush_lsa(p, en); |
70945cb6 | 509 | continue; |
3d15dcdb | 510 | } |
70945cb6 OZ |
511 | |
512 | en->lsa.age = real_age; | |
513 | } | |
514 | } | |
515 | ||
516 | ||
74c838a8 | 517 | static u32 |
70945cb6 OZ |
518 | ort_to_lsaid(struct ospf_proto *p, ort *nf) |
519 | { | |
520 | /* | |
521 | * In OSPFv2, We have to map IP prefixes to u32 in such manner that resulting | |
522 | * u32 interpreted as IP address is a member of given prefix. Therefore, /32 | |
fe9f1a6d OZ |
523 | * prefix has to be mapped on itself. All received prefixes have to be mapped |
524 | * on different u32s. | |
70945cb6 OZ |
525 | * |
526 | * We have an assumption that if there is nontrivial (non-/32) network prefix, | |
527 | * then there is not /32 prefix for the first and the last IP address of the | |
528 | * network (these are usually reserved, therefore it is not an important | |
529 | * restriction). The network prefix is mapped to the first or the last IP | |
530 | * address in the manner that disallow collisions - we use the IP address that | |
531 | * cannot be used by the parent prefix. | |
532 | * | |
533 | * For example: | |
534 | * 192.168.0.0/24 maps to 192.168.0.255 | |
535 | * 192.168.1.0/24 maps to 192.168.1.0 | |
536 | * because 192.168.0.0 and 192.168.1.255 might be used by 192.168.0.0/23 . | |
537 | * | |
538 | * Appendig E of RFC 2328 suggests different algorithm, that tries to maximize | |
539 | * both compatibility and subnetting. But as it is not possible to have both | |
540 | * reliably and the suggested algorithm was unnecessary complicated and it | |
541 | * does crazy things like changing LSA ID for a network because different | |
542 | * network appeared, we choose a different way. | |
543 | * | |
544 | * In OSPFv3, it is simpler. There is not a requirement for membership of the | |
74c838a8 OZ |
545 | * result in the input network, so we just allocate a unique ID from ID map |
546 | * and store it in nf->lsa_id for further reference. | |
70945cb6 OZ |
547 | */ |
548 | ||
549 | if (ospf_is_v3(p)) | |
74c838a8 OZ |
550 | { |
551 | if (!nf->lsa_id) | |
552 | nf->lsa_id = idm_alloc(&p->idm); | |
553 | ||
554 | return nf->lsa_id; | |
555 | } | |
70945cb6 | 556 | |
fe9f1a6d OZ |
557 | net_addr_ip4 *net = (void *) nf->fn.addr; |
558 | u32 id = ip4_to_u32(net->prefix); | |
559 | int pxlen = net->pxlen; | |
70945cb6 OZ |
560 | |
561 | if ((pxlen == 0) || (pxlen == 32)) | |
562 | return id; | |
563 | ||
564 | if (id & (1 << (32 - pxlen))) | |
565 | return id; | |
566 | else | |
567 | return id | ~u32_mkmask(pxlen); | |
568 | } | |
569 | ||
570 | ||
571 | static void * | |
a7a7372a | 572 | lsab_alloc(struct ospf_proto *p, uint size) |
70945cb6 | 573 | { |
a7a7372a | 574 | uint offset = p->lsab_used; |
70945cb6 OZ |
575 | p->lsab_used += size; |
576 | if (p->lsab_used > p->lsab_size) | |
577 | { | |
578 | p->lsab_size = MAX(p->lsab_used, 2 * p->lsab_size); | |
579 | p->lsab = p->lsab ? mb_realloc(p->lsab, p->lsab_size): | |
580 | mb_alloc(p->p.pool, p->lsab_size); | |
581 | } | |
582 | return ((byte *) p->lsab) + offset; | |
3d15dcdb OZ |
583 | } |
584 | ||
585 | static inline void * | |
a7a7372a | 586 | lsab_allocz(struct ospf_proto *p, uint size) |
3d15dcdb | 587 | { |
70945cb6 | 588 | void *r = lsab_alloc(p, size); |
3d15dcdb OZ |
589 | bzero(r, size); |
590 | return r; | |
591 | } | |
592 | ||
593 | static inline void * | |
70945cb6 | 594 | lsab_flush(struct ospf_proto *p) |
3d15dcdb | 595 | { |
70945cb6 OZ |
596 | void *r = mb_alloc(p->p.pool, p->lsab_used); |
597 | memcpy(r, p->lsab, p->lsab_used); | |
598 | p->lsab_used = 0; | |
3d15dcdb OZ |
599 | return r; |
600 | } | |
601 | ||
70945cb6 OZ |
602 | static inline void |
603 | lsab_reset(struct ospf_proto *p) | |
c3226991 | 604 | { |
70945cb6 | 605 | p->lsab_used = 0; |
c3226991 OZ |
606 | } |
607 | ||
608 | static inline void * | |
a7a7372a | 609 | lsab_offset(struct ospf_proto *p, uint offset) |
c3226991 | 610 | { |
70945cb6 | 611 | return ((byte *) p->lsab) + offset; |
c3226991 OZ |
612 | } |
613 | ||
3e236955 | 614 | static inline void * UNUSED |
70945cb6 | 615 | lsab_end(struct ospf_proto *p) |
52572e94 | 616 | { |
70945cb6 | 617 | return ((byte *) p->lsab) + p->lsab_used; |
52572e94 OZ |
618 | } |
619 | ||
c3226991 | 620 | |
70945cb6 OZ |
621 | /* |
622 | * Router-LSA handling | |
623 | * Type = LSA_T_RT | |
624 | */ | |
625 | ||
38675202 OZ |
626 | static int |
627 | configured_stubnet(struct ospf_area *oa, struct ifa *a) | |
628 | { | |
52a43ae3 | 629 | /* Does not work for IA_PEER addresses, but it is not called on these */ |
38675202 OZ |
630 | struct ospf_stubnet_config *sn; |
631 | WALK_LIST(sn, oa->ac->stubnet_list) | |
70945cb6 OZ |
632 | { |
633 | if (sn->summary) | |
38675202 | 634 | { |
d44e686e | 635 | if (net_in_netX(&a->prefix, &sn->prefix)) |
70945cb6 | 636 | return 1; |
38675202 | 637 | } |
70945cb6 OZ |
638 | else |
639 | { | |
d44e686e | 640 | if (net_equal(&a->prefix, &sn->prefix)) |
70945cb6 OZ |
641 | return 1; |
642 | } | |
643 | } | |
644 | ||
38675202 OZ |
645 | return 0; |
646 | } | |
3d15dcdb | 647 | |
70945cb6 | 648 | static int |
c3226991 OZ |
649 | bcast_net_active(struct ospf_iface *ifa) |
650 | { | |
651 | struct ospf_neighbor *neigh; | |
652 | ||
653 | if (ifa->state == OSPF_IS_WAITING) | |
654 | return 0; | |
655 | ||
656 | WALK_LIST(neigh, ifa->neigh_list) | |
70945cb6 OZ |
657 | { |
658 | if (neigh->state == NEIGHBOR_FULL) | |
c3226991 | 659 | { |
70945cb6 OZ |
660 | if (neigh->rid == ifa->drid) |
661 | return 1; | |
c3226991 | 662 | |
70945cb6 OZ |
663 | if (ifa->state == OSPF_IS_DR) |
664 | return 1; | |
c3226991 | 665 | } |
70945cb6 | 666 | } |
c3226991 OZ |
667 | |
668 | return 0; | |
669 | } | |
670 | ||
70945cb6 OZ |
671 | static inline u32 |
672 | get_rt_options(struct ospf_proto *p, struct ospf_area *oa, int bitv) | |
673 | { | |
674 | u32 opts = 0; | |
c3226991 | 675 | |
70945cb6 OZ |
676 | if (p->areano > 1) |
677 | opts |= OPT_RT_B; | |
c3226991 | 678 | |
70945cb6 OZ |
679 | if ((p->areano > 1) && oa_is_nssa(oa) && oa->ac->translator) |
680 | opts |= OPT_RT_NT; | |
ce17d4c1 | 681 | |
70945cb6 OZ |
682 | if (p->asbr && !oa_is_stub(oa)) |
683 | opts |= OPT_RT_E; | |
c3226991 | 684 | |
70945cb6 OZ |
685 | if (bitv) |
686 | opts |= OPT_RT_V; | |
c3226991 | 687 | |
70945cb6 OZ |
688 | return opts; |
689 | } | |
c3226991 | 690 | |
70945cb6 OZ |
691 | static inline void |
692 | add_rt2_lsa_link(struct ospf_proto *p, u8 type, u32 id, u32 data, u16 metric) | |
693 | { | |
694 | struct ospf_lsa_rt2_link *ln = lsab_alloc(p, sizeof(struct ospf_lsa_rt2_link)); | |
695 | ln->type = type; | |
696 | ln->id = id; | |
697 | ln->data = data; | |
698 | ln->metric = metric; | |
699 | ln->no_tos = 0; | |
700 | } | |
4160a9dd | 701 | |
70945cb6 OZ |
702 | static void |
703 | prepare_rt2_lsa_body(struct ospf_proto *p, struct ospf_area *oa) | |
704 | { | |
705 | struct ospf_iface *ifa; | |
706 | int i = 0, bitv = 0; | |
707 | struct ospf_neighbor *neigh; | |
c3226991 | 708 | |
70945cb6 OZ |
709 | ASSERT(p->lsab_used == 0); |
710 | lsab_allocz(p, sizeof(struct ospf_lsa_rt)); | |
711 | /* ospf_lsa_rt header will be filled later */ | |
b9ed99f7 | 712 | |
70945cb6 | 713 | WALK_LIST(ifa, p->iface_list) |
ce17d4c1 | 714 | { |
353729f5 | 715 | int net_lsa = 0; |
70945cb6 | 716 | u32 link_cost = p->stub_router ? 0xffff : ifa->cost; |
3d15dcdb OZ |
717 | |
718 | if ((ifa->type == OSPF_IT_VLINK) && (ifa->voa == oa) && | |
719 | (!EMPTY_LIST(ifa->neigh_list))) | |
5d3f5552 OF |
720 | { |
721 | neigh = (struct ospf_neighbor *) HEAD(ifa->neigh_list); | |
722 | if ((neigh->state == NEIGHBOR_FULL) && (ifa->cost <= 0xffff)) | |
3d15dcdb | 723 | bitv = 1; |
5d3f5552 | 724 | } |
3b16080c OF |
725 | |
726 | if ((ifa->oa != oa) || (ifa->state == OSPF_IS_DOWN)) | |
b9ed99f7 | 727 | continue; |
3b580a23 | 728 | |
e7b4948c OZ |
729 | ifa->rt_pos_beg = i; |
730 | ||
70945cb6 | 731 | /* RFC 2328 - 12.4.1.1-4 */ |
3d15dcdb | 732 | switch (ifa->type) |
70945cb6 OZ |
733 | { |
734 | case OSPF_IT_PTP: | |
735 | case OSPF_IT_PTMP: | |
736 | WALK_LIST(neigh, ifa->neigh_list) | |
737 | if (neigh->state == NEIGHBOR_FULL) | |
98ac6176 | 738 | { |
70945cb6 OZ |
739 | /* |
740 | * ln->data should be ifa->iface_id in case of no/ptp | |
741 | * address (ifa->addr->flags & IA_PEER) on PTP link (see | |
742 | * RFC 2328 12.4.1.1.), but the iface ID value has no use, | |
743 | * while using IP address even in this case is here for | |
744 | * compatibility with some broken implementations that use | |
745 | * this address as a next-hop. | |
746 | */ | |
747 | add_rt2_lsa_link(p, LSART_PTP, neigh->rid, ipa_to_u32(ifa->addr->ip), link_cost); | |
3d15dcdb | 748 | i++; |
70945cb6 OZ |
749 | } |
750 | break; | |
3d15dcdb | 751 | |
70945cb6 OZ |
752 | case OSPF_IT_BCAST: |
753 | case OSPF_IT_NBMA: | |
754 | if (bcast_net_active(ifa)) | |
755 | { | |
756 | add_rt2_lsa_link(p, LSART_NET, ipa_to_u32(ifa->drip), ipa_to_u32(ifa->addr->ip), link_cost); | |
757 | i++; | |
758 | net_lsa = 1; | |
ce17d4c1 | 759 | } |
70945cb6 OZ |
760 | break; |
761 | ||
762 | case OSPF_IT_VLINK: | |
763 | neigh = (struct ospf_neighbor *) HEAD(ifa->neigh_list); | |
764 | if ((!EMPTY_LIST(ifa->neigh_list)) && (neigh->state == NEIGHBOR_FULL) && (ifa->cost <= 0xffff)) | |
765 | add_rt2_lsa_link(p, LSART_VLNK, neigh->rid, ipa_to_u32(ifa->addr->ip), link_cost), i++; | |
766 | break; | |
767 | ||
768 | default: | |
f8fefde3 | 769 | log(L_BUG "OSPF: Unknown interface type"); |
70945cb6 OZ |
770 | break; |
771 | } | |
3d15dcdb | 772 | |
e7b4948c OZ |
773 | ifa->rt_pos_end = i; |
774 | ||
0aad2b92 OZ |
775 | /* Now we will originate stub area if there is no primary */ |
776 | if (net_lsa || | |
777 | (ifa->type == OSPF_IT_VLINK) || | |
a55a90fa | 778 | ((ifa->addr->flags & IA_PEER) && ! ifa->cf->stub) || |
0aad2b92 OZ |
779 | configured_stubnet(oa, ifa->addr)) |
780 | continue; | |
3d15dcdb | 781 | |
70945cb6 | 782 | /* Host or network stub entry */ |
52a43ae3 OZ |
783 | if ((ifa->addr->flags & IA_HOST) || |
784 | (ifa->state == OSPF_IS_LOOP) || | |
785 | (ifa->type == OSPF_IT_PTMP)) | |
70945cb6 | 786 | add_rt2_lsa_link(p, LSART_STUB, ipa_to_u32(ifa->addr->ip), 0xffffffff, 0); |
742029eb | 787 | else |
d44e686e OZ |
788 | add_rt2_lsa_link(p, LSART_STUB, ip4_to_u32(net4_prefix(&ifa->addr->prefix)), |
789 | u32_mkmask(net4_pxlen(&ifa->addr->prefix)), ifa->cost); | |
0aad2b92 | 790 | i++; |
e7b4948c OZ |
791 | |
792 | ifa->rt_pos_end = i; | |
ce17d4c1 | 793 | } |
3d15dcdb | 794 | |
38675202 | 795 | struct ospf_stubnet_config *sn; |
70945cb6 OZ |
796 | WALK_LIST(sn, oa->ac->stubnet_list) |
797 | if (!sn->hidden) | |
d44e686e OZ |
798 | add_rt2_lsa_link(p, LSART_STUB, ip4_to_u32(net4_prefix(&sn->prefix)), |
799 | u32_mkmask(net4_pxlen(&sn->prefix)), sn->cost), i++; | |
c3226991 | 800 | |
70945cb6 | 801 | struct ospf_lsa_rt *rt = p->lsab; |
742029eb | 802 | /* Store number of links in lower half of options */ |
70945cb6 | 803 | rt->options = get_rt_options(p, oa, bitv) | (u16) i; |
ce17d4c1 | 804 | } |
c45f48fb | 805 | |
70945cb6 OZ |
806 | static inline void |
807 | add_rt3_lsa_link(struct ospf_proto *p, u8 type, struct ospf_iface *ifa, u32 nif, u32 id) | |
c3226991 | 808 | { |
70945cb6 | 809 | struct ospf_lsa_rt3_link *ln = lsab_alloc(p, sizeof(struct ospf_lsa_rt3_link)); |
c3226991 OZ |
810 | ln->type = type; |
811 | ln->padding = 0; | |
812 | ln->metric = ifa->cost; | |
dd4da6f6 | 813 | ln->lif = ifa->iface_id; |
c3226991 OZ |
814 | ln->nif = nif; |
815 | ln->id = id; | |
816 | } | |
817 | ||
70945cb6 OZ |
818 | static void |
819 | prepare_rt3_lsa_body(struct ospf_proto *p, struct ospf_area *oa) | |
c3226991 | 820 | { |
c3226991 | 821 | struct ospf_iface *ifa; |
70945cb6 | 822 | struct ospf_neighbor *neigh; |
b49e6f5a | 823 | int bitv = 0; |
e7b4948c | 824 | int i = 0; |
4160a9dd | 825 | |
70945cb6 OZ |
826 | ASSERT(p->lsab_used == 0); |
827 | lsab_allocz(p, sizeof(struct ospf_lsa_rt)); | |
828 | /* ospf_lsa_rt header will be filled later */ | |
c3226991 | 829 | |
70945cb6 | 830 | WALK_LIST(ifa, p->iface_list) |
c3226991 OZ |
831 | { |
832 | if ((ifa->type == OSPF_IT_VLINK) && (ifa->voa == oa) && | |
833 | (!EMPTY_LIST(ifa->neigh_list))) | |
834 | { | |
835 | neigh = (struct ospf_neighbor *) HEAD(ifa->neigh_list); | |
836 | if ((neigh->state == NEIGHBOR_FULL) && (ifa->cost <= 0xffff)) | |
837 | bitv = 1; | |
838 | } | |
839 | ||
840 | if ((ifa->oa != oa) || (ifa->state == OSPF_IS_DOWN)) | |
841 | continue; | |
842 | ||
e7b4948c OZ |
843 | ifa->rt_pos_beg = i; |
844 | ||
70945cb6 | 845 | /* RFC 5340 - 4.4.3.2 */ |
c3226991 | 846 | switch (ifa->type) |
70945cb6 OZ |
847 | { |
848 | case OSPF_IT_PTP: | |
849 | case OSPF_IT_PTMP: | |
850 | WALK_LIST(neigh, ifa->neigh_list) | |
851 | if (neigh->state == NEIGHBOR_FULL) | |
852 | add_rt3_lsa_link(p, LSART_PTP, ifa, neigh->iface_id, neigh->rid), i++; | |
853 | break; | |
e7b4948c | 854 | |
70945cb6 OZ |
855 | case OSPF_IT_BCAST: |
856 | case OSPF_IT_NBMA: | |
857 | if (bcast_net_active(ifa)) | |
858 | add_rt3_lsa_link(p, LSART_NET, ifa, ifa->dr_iface_id, ifa->drid), i++; | |
859 | break; | |
c3226991 | 860 | |
70945cb6 OZ |
861 | case OSPF_IT_VLINK: |
862 | neigh = (struct ospf_neighbor *) HEAD(ifa->neigh_list); | |
863 | if ((!EMPTY_LIST(ifa->neigh_list)) && (neigh->state == NEIGHBOR_FULL) && (ifa->cost <= 0xffff)) | |
864 | add_rt3_lsa_link(p, LSART_VLNK, ifa, neigh->iface_id, neigh->rid), i++; | |
865 | break; | |
866 | ||
867 | default: | |
f8fefde3 | 868 | log(L_BUG "OSPF: Unknown interface type"); |
70945cb6 | 869 | break; |
c3226991 OZ |
870 | } |
871 | ||
70945cb6 OZ |
872 | ifa->rt_pos_end = i; |
873 | } | |
c3226991 | 874 | |
70945cb6 OZ |
875 | struct ospf_lsa_rt *rt = p->lsab; |
876 | rt->options = get_rt_options(p, oa, bitv) | (oa->options & LSA_OPTIONS_MASK); | |
877 | } | |
c3226991 | 878 | |
70945cb6 OZ |
879 | static void |
880 | ospf_originate_rt_lsa(struct ospf_proto *p, struct ospf_area *oa) | |
d8852b36 | 881 | { |
70945cb6 OZ |
882 | struct ospf_new_lsa lsa = { |
883 | .type = LSA_T_RT, | |
884 | .dom = oa->areaid, | |
885 | .id = ospf_is_v2(p) ? p->router_id : 0, | |
886 | .opts = oa->options | |
887 | }; | |
d8852b36 | 888 | |
a7a7372a OZ |
889 | OSPF_TRACE(D_EVENTS, "Updating router state for area %R", oa->areaid); |
890 | ||
70945cb6 OZ |
891 | if (ospf_is_v2(p)) |
892 | prepare_rt2_lsa_body(p, oa); | |
893 | else | |
894 | prepare_rt3_lsa_body(p, oa); | |
b9ed99f7 | 895 | |
70945cb6 OZ |
896 | oa->rt = ospf_originate_lsa(p, &lsa); |
897 | } | |
cf31112f | 898 | |
c3226991 | 899 | |
70945cb6 OZ |
900 | /* |
901 | * Net-LSA handling | |
902 | * Type = LSA_T_NET | |
903 | */ | |
b49e6f5a | 904 | |
70945cb6 OZ |
905 | static void |
906 | prepare_net2_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa) | |
b49e6f5a | 907 | { |
70945cb6 OZ |
908 | struct ospf_lsa_net *net; |
909 | struct ospf_neighbor *n; | |
910 | int nodes = ifa->fadj + 1; | |
911 | u16 i = 1; | |
b49e6f5a | 912 | |
70945cb6 OZ |
913 | ASSERT(p->lsab_used == 0); |
914 | net = lsab_alloc(p, sizeof(struct ospf_lsa_net) + 4 * nodes); | |
b49e6f5a | 915 | |
d44e686e | 916 | net->optx = u32_mkmask(ifa->addr->prefix.pxlen); |
70945cb6 | 917 | net->routers[0] = p->router_id; |
b49e6f5a | 918 | |
70945cb6 OZ |
919 | WALK_LIST(n, ifa->neigh_list) |
920 | { | |
921 | if (n->state == NEIGHBOR_FULL) | |
922 | { | |
923 | net->routers[i] = n->rid; | |
924 | i++; | |
925 | } | |
926 | } | |
927 | ASSERT(i == nodes); | |
ab56f6b1 OF |
928 | } |
929 | ||
70945cb6 OZ |
930 | static void |
931 | prepare_net3_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa) | |
0bf2f203 | 932 | { |
d345cda5 | 933 | struct ospf_lsa_net *net; |
c3226991 | 934 | int nodes = ifa->fadj + 1; |
c3226991 | 935 | u32 options = 0; |
70945cb6 OZ |
936 | u16 i = 1; |
937 | ||
938 | ASSERT(p->lsab_used == 0); | |
939 | net = lsab_alloc(p, sizeof(struct ospf_lsa_net) + 4 * nodes); | |
c3226991 | 940 | |
70945cb6 | 941 | net->routers[0] = p->router_id; |
d345cda5 | 942 | |
70945cb6 | 943 | struct ospf_neighbor *n; |
b9ed99f7 | 944 | WALK_LIST(n, ifa->neigh_list) |
0bf2f203 | 945 | { |
b9ed99f7 | 946 | if (n->state == NEIGHBOR_FULL) |
0bf2f203 | 947 | { |
70945cb6 OZ |
948 | /* In OSPFv3, we would like to merge options from Link LSAs of added neighbors */ |
949 | ||
950 | struct top_hash_entry *en = | |
951 | ospf_hash_find(p->gr, ifa->iface_id, n->iface_id, n->rid, LSA_T_LINK); | |
952 | ||
c3226991 OZ |
953 | if (en) |
954 | options |= ((struct ospf_lsa_link *) en->lsa_body)->options; | |
c3226991 OZ |
955 | |
956 | net->routers[i] = n->rid; | |
0bf2f203 OF |
957 | i++; |
958 | } | |
959 | } | |
c3226991 OZ |
960 | ASSERT(i == nodes); |
961 | ||
70945cb6 | 962 | net->optx = options & LSA_OPTIONS_MASK; |
0bf2f203 OF |
963 | } |
964 | ||
70945cb6 OZ |
965 | static void |
966 | ospf_originate_net_lsa(struct ospf_proto *p, struct ospf_iface *ifa) | |
967 | { | |
968 | struct ospf_new_lsa lsa = { | |
969 | .type = LSA_T_NET, | |
970 | .dom = ifa->oa->areaid, | |
971 | .id = ospf_is_v2(p) ? ipa_to_u32(ifa->addr->ip) : ifa->iface_id, | |
972 | .opts = ifa->oa->options, | |
973 | .ifa = ifa | |
974 | }; | |
975 | ||
a7a7372a OZ |
976 | OSPF_TRACE(D_EVENTS, "Updating network state for %s (Id: %R)", ifa->ifname, lsa.id); |
977 | ||
70945cb6 OZ |
978 | if (ospf_is_v2(p)) |
979 | prepare_net2_lsa_body(p, ifa); | |
b49e6f5a | 980 | else |
70945cb6 | 981 | prepare_net3_lsa_body(p, ifa); |
9727681a | 982 | |
70945cb6 | 983 | ifa->net_lsa = ospf_originate_lsa(p, &lsa); |
9727681a OZ |
984 | } |
985 | ||
7ff5803b | 986 | |
70945cb6 OZ |
987 | /* |
988 | * (Net|Rt)-summary-LSA handling | |
989 | * (a.k.a. Inter-Area-(Prefix|Router)-LSA) | |
990 | * Type = LSA_T_SUM_NET, LSA_T_SUM_RT | |
991 | */ | |
0077aab4 | 992 | |
70945cb6 OZ |
993 | static inline void |
994 | prepare_sum2_lsa_body(struct ospf_proto *p, uint pxlen, u32 metric) | |
0077aab4 | 995 | { |
70945cb6 | 996 | struct ospf_lsa_sum2 *sum; |
c3226991 | 997 | |
70945cb6 OZ |
998 | sum = lsab_allocz(p, sizeof(struct ospf_lsa_sum2)); |
999 | sum->netmask = u32_mkmask(pxlen); | |
c3226991 | 1000 | sum->metric = metric; |
c3226991 OZ |
1001 | } |
1002 | ||
70945cb6 OZ |
1003 | static inline void |
1004 | prepare_sum3_net_lsa_body(struct ospf_proto *p, ort *nf, u32 metric) | |
9727681a | 1005 | { |
70945cb6 | 1006 | struct ospf_lsa_sum3_net *sum; |
9727681a | 1007 | |
fe9f1a6d OZ |
1008 | sum = lsab_allocz(p, sizeof(struct ospf_lsa_sum3_net) + |
1009 | IPV6_PREFIX_SPACE(nf->fn.addr->pxlen)); | |
70945cb6 | 1010 | sum->metric = metric; |
fe9f1a6d | 1011 | ospf_put_ipv6_prefix(sum->prefix, nf->fn.addr, 0, 0); |
9727681a OZ |
1012 | } |
1013 | ||
70945cb6 OZ |
1014 | static inline void |
1015 | prepare_sum3_rt_lsa_body(struct ospf_proto *p, u32 drid, u32 metric, u32 options) | |
c3226991 | 1016 | { |
70945cb6 | 1017 | struct ospf_lsa_sum3_rt *sum; |
c3226991 | 1018 | |
70945cb6 | 1019 | sum = lsab_allocz(p, sizeof(struct ospf_lsa_sum3_rt)); |
7ff5803b | 1020 | sum->options = options; |
c3226991 OZ |
1021 | sum->metric = metric; |
1022 | sum->drid = drid; | |
7ff5803b OZ |
1023 | } |
1024 | ||
98ac6176 | 1025 | void |
70945cb6 | 1026 | ospf_originate_sum_net_lsa(struct ospf_proto *p, struct ospf_area *oa, ort *nf, int metric) |
98ac6176 | 1027 | { |
70945cb6 OZ |
1028 | struct ospf_new_lsa lsa = { |
1029 | .type = LSA_T_SUM_NET, | |
a7a7372a | 1030 | .mode = LSA_M_RTCALC, |
70945cb6 OZ |
1031 | .dom = oa->areaid, |
1032 | .id = ort_to_lsaid(p, nf), | |
1033 | .opts = oa->options, | |
1034 | .nf = nf | |
1035 | }; | |
7ff5803b | 1036 | |
70945cb6 | 1037 | if (ospf_is_v2(p)) |
fe9f1a6d | 1038 | prepare_sum2_lsa_body(p, nf->fn.addr->pxlen, metric); |
70945cb6 OZ |
1039 | else |
1040 | prepare_sum3_net_lsa_body(p, nf, metric); | |
c3226991 | 1041 | |
a7a7372a | 1042 | ospf_originate_lsa(p, &lsa); |
9727681a | 1043 | } |
c3226991 | 1044 | |
9727681a | 1045 | void |
fe9f1a6d | 1046 | ospf_originate_sum_rt_lsa(struct ospf_proto *p, struct ospf_area *oa, u32 drid, int metric, u32 options) |
9727681a | 1047 | { |
70945cb6 OZ |
1048 | struct ospf_new_lsa lsa = { |
1049 | .type = LSA_T_SUM_RT, | |
a7a7372a | 1050 | .mode = LSA_M_RTCALC, |
70945cb6 | 1051 | .dom = oa->areaid, |
fe9f1a6d | 1052 | .id = drid, /* Router ID of ASBR, irrelevant for OSPFv3 */ |
70945cb6 OZ |
1053 | .opts = oa->options |
1054 | }; | |
98ac6176 | 1055 | |
70945cb6 OZ |
1056 | if (ospf_is_v2(p)) |
1057 | prepare_sum2_lsa_body(p, 0, metric); | |
c3226991 | 1058 | else |
fe9f1a6d | 1059 | prepare_sum3_rt_lsa_body(p, drid, metric, options & LSA_OPTIONS_MASK); |
9727681a | 1060 | |
a7a7372a | 1061 | ospf_originate_lsa(p, &lsa); |
98ac6176 OF |
1062 | } |
1063 | ||
c3226991 | 1064 | |
7ff5803b | 1065 | /* |
70945cb6 OZ |
1066 | * AS-external-LSA and NSSA-LSA handling |
1067 | * Type = LSA_T_EXT, LSA_T_NSSA | |
7ff5803b | 1068 | */ |
c3226991 | 1069 | |
70945cb6 OZ |
1070 | static inline void |
1071 | prepare_ext2_lsa_body(struct ospf_proto *p, uint pxlen, | |
1072 | u32 metric, u32 ebit, ip_addr fwaddr, u32 tag) | |
7ff5803b | 1073 | { |
70945cb6 | 1074 | struct ospf_lsa_ext2 *ext; |
7ff5803b | 1075 | |
70945cb6 OZ |
1076 | ext = lsab_allocz(p, sizeof(struct ospf_lsa_ext2)); |
1077 | ext->metric = metric & LSA_METRIC_MASK; | |
1078 | ext->netmask = u32_mkmask(pxlen); | |
1079 | ext->fwaddr = ipa_to_u32(fwaddr); | |
1080 | ext->tag = tag; | |
7ff5803b | 1081 | |
70945cb6 OZ |
1082 | if (ebit) |
1083 | ext->metric |= LSA_EXT2_EBIT; | |
7ff5803b | 1084 | } |
c3226991 | 1085 | |
70945cb6 OZ |
1086 | static inline void |
1087 | prepare_ext3_lsa_body(struct ospf_proto *p, ort *nf, | |
1088 | u32 metric, u32 ebit, ip_addr fwaddr, u32 tag, int pbit) | |
7ff5803b | 1089 | { |
70945cb6 OZ |
1090 | struct ospf_lsa_ext3 *ext; |
1091 | int bsize = sizeof(struct ospf_lsa_ext3) | |
fe9f1a6d | 1092 | + IPV6_PREFIX_SPACE(nf->fn.addr->pxlen) |
7ff5803b OZ |
1093 | + (ipa_nonzero(fwaddr) ? 16 : 0) |
1094 | + (tag ? 4 : 0); | |
1095 | ||
70945cb6 OZ |
1096 | ext = lsab_allocz(p, bsize); |
1097 | ext->metric = metric & LSA_METRIC_MASK; | |
1098 | u32 *buf = ext->rest; | |
7ff5803b | 1099 | |
fe9f1a6d | 1100 | buf = ospf_put_ipv6_prefix(buf, nf->fn.addr, pbit ? OPT_PX_P : 0, 0); |
7ff5803b | 1101 | |
70945cb6 OZ |
1102 | if (ebit) |
1103 | ext->metric |= LSA_EXT3_EBIT; | |
c3226991 | 1104 | |
7ff5803b OZ |
1105 | if (ipa_nonzero(fwaddr)) |
1106 | { | |
70945cb6 | 1107 | ext->metric |= LSA_EXT3_FBIT; |
fe9f1a6d | 1108 | buf = ospf_put_ipv6_addr(buf, fwaddr); |
7ff5803b | 1109 | } |
c3226991 OZ |
1110 | |
1111 | if (tag) | |
7ff5803b | 1112 | { |
70945cb6 | 1113 | ext->metric |= LSA_EXT3_TBIT; |
7ff5803b OZ |
1114 | *buf++ = tag; |
1115 | } | |
c3226991 OZ |
1116 | } |
1117 | ||
70945cb6 OZ |
1118 | /** |
1119 | * originate_ext_lsa - new route received from nest and filters | |
a7a7372a | 1120 | * @p: OSPF protocol instance |
70945cb6 OZ |
1121 | * @oa: ospf_area for which LSA is originated |
1122 | * @nf: network prefix and mask | |
a7a7372a OZ |
1123 | * @mode: the mode of the LSA (LSA_M_EXPORT or LSA_M_RTCALC) |
1124 | * @metric: the metric of a route | |
1125 | * @ebit: E-bit for route metric (bool) | |
70945cb6 OZ |
1126 | * @fwaddr: the forwarding address |
1127 | * @tag: the route tag | |
a7a7372a | 1128 | * @pbit: P-bit for NSSA LSAs (bool), ignored for external LSAs |
70945cb6 OZ |
1129 | * |
1130 | * If I receive a message that new route is installed, I try to originate an | |
1131 | * external LSA. If @oa is an NSSA area, NSSA-LSA is originated instead. | |
1132 | * @oa should not be a stub area. @src does not specify whether the LSA | |
742029eb | 1133 | * is external or NSSA, but it specifies the source of origination - |
70945cb6 OZ |
1134 | * the export from ospf_rt_notify(), or the NSSA-EXT translation. |
1135 | */ | |
1136 | void | |
a7a7372a | 1137 | ospf_originate_ext_lsa(struct ospf_proto *p, struct ospf_area *oa, ort *nf, u8 mode, |
70945cb6 | 1138 | u32 metric, u32 ebit, ip_addr fwaddr, u32 tag, int pbit) |
7ff5803b | 1139 | { |
70945cb6 OZ |
1140 | struct ospf_new_lsa lsa = { |
1141 | .type = oa ? LSA_T_NSSA : LSA_T_EXT, | |
a7a7372a | 1142 | .mode = mode, /* LSA_M_EXPORT or LSA_M_RTCALC */ |
70945cb6 OZ |
1143 | .dom = oa ? oa->areaid : 0, |
1144 | .id = ort_to_lsaid(p, nf), | |
1145 | .opts = oa ? (pbit ? OPT_P : 0) : OPT_E, | |
1146 | .nf = nf | |
1147 | }; | |
7ff5803b | 1148 | |
70945cb6 | 1149 | if (ospf_is_v2(p)) |
fe9f1a6d | 1150 | prepare_ext2_lsa_body(p, nf->fn.addr->pxlen, metric, ebit, fwaddr, tag); |
70945cb6 OZ |
1151 | else |
1152 | prepare_ext3_lsa_body(p, nf, metric, ebit, fwaddr, tag, oa && pbit); | |
7ff5803b | 1153 | |
a7a7372a | 1154 | ospf_originate_lsa(p, &lsa); |
70945cb6 OZ |
1155 | } |
1156 | ||
6f8bbaa1 OZ |
1157 | static struct top_hash_entry * |
1158 | ospf_hash_find_(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type); | |
1159 | ||
70945cb6 OZ |
1160 | static void |
1161 | ospf_flush_ext_lsa(struct ospf_proto *p, struct ospf_area *oa, ort *nf) | |
1162 | { | |
1163 | struct top_hash_entry *en; | |
d395fe48 | 1164 | |
70945cb6 OZ |
1165 | u32 type = oa ? LSA_T_NSSA : LSA_T_EXT; |
1166 | u32 dom = oa ? oa->areaid : 0; | |
1167 | u32 id = ort_to_lsaid(p, nf); | |
7ff5803b | 1168 | |
6f8bbaa1 | 1169 | en = ospf_hash_find_(p->gr, dom, id, p->router_id, type); |
7ff5803b | 1170 | |
70945cb6 OZ |
1171 | if (!en || (en->nf != nf)) |
1172 | return; | |
7ff5803b | 1173 | |
70945cb6 | 1174 | ospf_flush_lsa(p, en); |
7ff5803b OZ |
1175 | } |
1176 | ||
70945cb6 OZ |
1177 | static inline int |
1178 | use_gw_for_fwaddr(struct ospf_proto *p, ip_addr gw, struct iface *iface) | |
1179 | { | |
1180 | struct ospf_iface *ifa; | |
1181 | ||
1182 | if (ipa_zero(gw) || ipa_is_link_local(gw)) | |
1183 | return 0; | |
7ff5803b | 1184 | |
70945cb6 OZ |
1185 | WALK_LIST(ifa, p->iface_list) |
1186 | if ((ifa->iface == iface) && | |
d44e686e | 1187 | (!ospf_is_v2(p) || ipa_in_netX(gw, &ifa->addr->prefix))) |
70945cb6 OZ |
1188 | return 1; |
1189 | ||
1190 | return 0; | |
1191 | } | |
7ff5803b | 1192 | |
2918e610 | 1193 | static inline ip_addr |
70945cb6 | 1194 | find_surrogate_fwaddr(struct ospf_proto *p, struct ospf_area *oa) |
2918e610 | 1195 | { |
2918e610 OZ |
1196 | struct ospf_iface *ifa; |
1197 | struct ifa *a, *cur_addr = NULL; | |
1198 | int np, cur_np = 0; | |
1199 | ||
70945cb6 OZ |
1200 | /* RFC 3101 2.3 - surrogate forwarding address selection */ |
1201 | ||
1202 | WALK_LIST(ifa, p->iface_list) | |
2918e610 OZ |
1203 | { |
1204 | if ((ifa->oa != oa) || | |
2918e610 OZ |
1205 | (ifa->type == OSPF_IT_VLINK)) |
1206 | continue; | |
1207 | ||
70945cb6 | 1208 | if (ospf_is_v2(p)) |
2918e610 | 1209 | { |
70945cb6 OZ |
1210 | a = ifa->addr; |
1211 | if (a->flags & IA_PEER) | |
2918e610 OZ |
1212 | continue; |
1213 | ||
70945cb6 | 1214 | np = (a->flags & IA_HOST) ? 3 : (ifa->stub ? 2 : 1); |
2918e610 OZ |
1215 | if (np > cur_np) |
1216 | { | |
1217 | cur_addr = a; | |
1218 | cur_np = np; | |
1219 | } | |
1220 | } | |
70945cb6 OZ |
1221 | else /* OSPFv3 */ |
1222 | { | |
1223 | WALK_LIST(a, ifa->iface->addrs) | |
1224 | { | |
d44e686e OZ |
1225 | if ((a->prefix.type != NET_IP6) || |
1226 | (a->flags & IA_SECONDARY) || | |
70945cb6 OZ |
1227 | (a->flags & IA_PEER) || |
1228 | (a->scope <= SCOPE_LINK)) | |
1229 | continue; | |
1230 | ||
1231 | np = (a->flags & IA_HOST) ? 3 : (ifa->stub ? 2 : 1); | |
1232 | if (np > cur_np) | |
1233 | { | |
1234 | cur_addr = a; | |
1235 | cur_np = np; | |
1236 | } | |
1237 | } | |
1238 | } | |
2918e610 OZ |
1239 | } |
1240 | ||
1241 | return cur_addr ? cur_addr->ip : IPA_NONE; | |
1242 | } | |
1243 | ||
e8085aba | 1244 | void |
4bdf1881 | 1245 | ospf_rt_notify(struct proto *P, struct channel *ch UNUSED, net *n, rte *new, rte *old UNUSED, ea_list *ea) |
e8085aba | 1246 | { |
70945cb6 OZ |
1247 | struct ospf_proto *p = (struct ospf_proto *) P; |
1248 | struct ospf_area *oa = NULL; /* non-NULL for NSSA-LSA */ | |
1249 | ort *nf; | |
41b612c3 | 1250 | |
70945cb6 OZ |
1251 | /* |
1252 | * There are several posibilities: | |
1253 | * 1) router in regular area - originate external LSA with global scope | |
1254 | * 2) router in NSSA area - originate area-specific NSSA-LSA | |
1255 | * 3) router in stub area - cannot export routes | |
1256 | * 4) area border router - same as (1), it is attached to backbone | |
1257 | */ | |
b9ed99f7 | 1258 | |
70945cb6 OZ |
1259 | if ((p->areano == 1) && oa_is_nssa(HEAD(p->area_list))) |
1260 | oa = HEAD(p->area_list); | |
273fd2c1 | 1261 | |
70945cb6 | 1262 | if (!new) |
41b612c3 | 1263 | { |
fe9f1a6d | 1264 | nf = fib_find(&p->rtf, n->n.addr); |
2918e610 | 1265 | |
70945cb6 | 1266 | if (!nf || !nf->external_rte) |
2918e610 | 1267 | return; |
41b612c3 | 1268 | |
70945cb6 OZ |
1269 | ospf_flush_ext_lsa(p, oa, nf); |
1270 | nf->external_rte = 0; | |
273fd2c1 | 1271 | |
70945cb6 OZ |
1272 | /* Old external route might blocked some NSSA translation */ |
1273 | if ((p->areano > 1) && rt_is_nssa(nf) && nf->n.oa->translate) | |
a7a7372a | 1274 | ospf_schedule_rtcalc(p); |
7ff5803b | 1275 | |
70945cb6 OZ |
1276 | return; |
1277 | } | |
c3226991 | 1278 | |
70945cb6 | 1279 | ASSERT(p->asbr); |
2918e610 | 1280 | |
70945cb6 OZ |
1281 | /* Get route attributes */ |
1282 | rta *a = new->attrs; | |
1283 | u32 m1 = ea_get_int(ea, EA_OSPF_METRIC1, LSINFINITY); | |
1284 | u32 m2 = ea_get_int(ea, EA_OSPF_METRIC2, 10000); | |
1285 | int ebit = (m1 == LSINFINITY); | |
1286 | u32 metric = ebit ? m2 : m1; | |
1287 | u32 tag = ea_get_int(ea, EA_OSPF_TAG, 0); | |
1288 | ip_addr fwd = IPA_NONE; | |
fdb19982 | 1289 | |
e8085aba | 1290 | |
4e276a89 MM |
1291 | if ((a->dest == RTD_UNICAST) && use_gw_for_fwaddr(p, a->nh.gw, a->nh.iface)) |
1292 | fwd = a->nh.gw; | |
be862406 | 1293 | |
70945cb6 OZ |
1294 | /* NSSA-LSA with P-bit set must have non-zero forwarding address */ |
1295 | if (oa && ipa_zero(fwd)) | |
1296 | { | |
1297 | fwd = find_surrogate_fwaddr(p, oa); | |
c3226991 | 1298 | |
70945cb6 | 1299 | if (ipa_zero(fwd)) |
c3226991 | 1300 | { |
fe9f1a6d OZ |
1301 | log(L_ERR "%s: Cannot find forwarding address for NSSA-LSA %N", |
1302 | p->p.name, n->n.addr); | |
70945cb6 | 1303 | return; |
c3226991 | 1304 | } |
70945cb6 OZ |
1305 | } |
1306 | ||
fe9f1a6d | 1307 | nf = fib_get(&p->rtf, n->n.addr); |
a7a7372a | 1308 | ospf_originate_ext_lsa(p, oa, nf, LSA_M_EXPORT, metric, ebit, fwd, tag, 1); |
70945cb6 | 1309 | nf->external_rte = 1; |
c3226991 OZ |
1310 | } |
1311 | ||
1312 | ||
70945cb6 OZ |
1313 | /* |
1314 | * Link-LSA handling (assume OSPFv3) | |
1315 | * Type = LSA_T_LINK | |
1316 | */ | |
c3226991 | 1317 | |
70945cb6 | 1318 | static inline void |
d44e686e | 1319 | lsab_put_prefix(struct ospf_proto *p, net_addr *net, u32 cost) |
70945cb6 | 1320 | { |
d44e686e OZ |
1321 | void *buf = lsab_alloc(p, IPV6_PREFIX_SPACE(net6_pxlen(net))); |
1322 | u8 flags = (net6_pxlen(net) < IP6_MAX_PREFIX_LENGTH) ? 0 : OPT_PX_LA; | |
1323 | ospf_put_ipv6_prefix(buf, net, flags, cost); | |
70945cb6 OZ |
1324 | } |
1325 | ||
1326 | static void | |
1327 | prepare_link_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa) | |
c3226991 | 1328 | { |
c3226991 OZ |
1329 | struct ospf_lsa_link *ll; |
1330 | int i = 0; | |
c3226991 | 1331 | |
70945cb6 OZ |
1332 | ASSERT(p->lsab_used == 0); |
1333 | ll = lsab_allocz(p, sizeof(struct ospf_lsa_link)); | |
c3226991 | 1334 | ll->options = ifa->oa->options | (ifa->priority << 24); |
88a183c6 | 1335 | ll->lladdr = ipa_to_ip6(ifa->addr->ip); |
c3226991 OZ |
1336 | ll = NULL; /* buffer might be reallocated later */ |
1337 | ||
1338 | struct ifa *a; | |
1339 | WALK_LIST(a, ifa->iface->addrs) | |
70945cb6 | 1340 | { |
d44e686e OZ |
1341 | if ((a->prefix.type != NET_IP6) || |
1342 | (a->flags & IA_SECONDARY) || | |
1343 | (a->scope <= SCOPE_LINK)) | |
70945cb6 | 1344 | continue; |
c3226991 | 1345 | |
d44e686e | 1346 | lsab_put_prefix(p, &a->prefix, 0); |
70945cb6 OZ |
1347 | i++; |
1348 | } | |
c3226991 | 1349 | |
70945cb6 | 1350 | ll = p->lsab; |
c3226991 | 1351 | ll->pxcount = i; |
c3226991 OZ |
1352 | } |
1353 | ||
70945cb6 OZ |
1354 | static void |
1355 | ospf_originate_link_lsa(struct ospf_proto *p, struct ospf_iface *ifa) | |
c3226991 | 1356 | { |
70945cb6 | 1357 | if (ospf_is_v2(p)) |
48e5f32d OZ |
1358 | return; |
1359 | ||
70945cb6 OZ |
1360 | struct ospf_new_lsa lsa = { |
1361 | .type = LSA_T_LINK, | |
1362 | .dom = ifa->iface_id, | |
1363 | .id = ifa->iface_id, | |
1364 | .ifa = ifa | |
1365 | }; | |
c3226991 | 1366 | |
a7a7372a OZ |
1367 | OSPF_TRACE(D_EVENTS, "Updating link state for %s (Id: %R)", ifa->ifname, lsa.id); |
1368 | ||
70945cb6 | 1369 | prepare_link_lsa_body(p, ifa); |
be862406 | 1370 | |
70945cb6 | 1371 | ifa->link_lsa = ospf_originate_lsa(p, &lsa); |
c3226991 OZ |
1372 | } |
1373 | ||
1374 | ||
70945cb6 OZ |
1375 | /* |
1376 | * Prefix-Rt-LSA handling (assume OSPFv3) | |
1377 | * Type = LSA_T_PREFIX, referred type = LSA_T_RT | |
1378 | */ | |
d9e7e1b1 | 1379 | |
70945cb6 OZ |
1380 | static void |
1381 | prepare_prefix_rt_lsa_body(struct ospf_proto *p, struct ospf_area *oa) | |
c3226991 | 1382 | { |
70945cb6 | 1383 | struct ospf_config *cf = (struct ospf_config *) (p->p.cf); |
c3226991 OZ |
1384 | struct ospf_iface *ifa; |
1385 | struct ospf_lsa_prefix *lp; | |
3b89a232 | 1386 | int host_addr = 0; |
c3226991 OZ |
1387 | int net_lsa; |
1388 | int i = 0; | |
c3226991 | 1389 | |
70945cb6 OZ |
1390 | ASSERT(p->lsab_used == 0); |
1391 | lp = lsab_allocz(p, sizeof(struct ospf_lsa_prefix)); | |
c3226991 OZ |
1392 | lp->ref_type = LSA_T_RT; |
1393 | lp->ref_id = 0; | |
70945cb6 | 1394 | lp->ref_rt = p->router_id; |
c3226991 OZ |
1395 | lp = NULL; /* buffer might be reallocated later */ |
1396 | ||
70945cb6 | 1397 | WALK_LIST(ifa, p->iface_list) |
c3226991 | 1398 | { |
e4404cef | 1399 | if ((ifa->oa != oa) || (ifa->type == OSPF_IT_VLINK) || (ifa->state == OSPF_IS_DOWN)) |
c3226991 OZ |
1400 | continue; |
1401 | ||
e7b4948c OZ |
1402 | ifa->px_pos_beg = i; |
1403 | ||
c3226991 OZ |
1404 | if ((ifa->type == OSPF_IT_BCAST) || |
1405 | (ifa->type == OSPF_IT_NBMA)) | |
1406 | net_lsa = bcast_net_active(ifa); | |
1407 | else | |
1408 | net_lsa = 0; | |
1409 | ||
1410 | struct ifa *a; | |
1411 | WALK_LIST(a, ifa->iface->addrs) | |
70945cb6 | 1412 | { |
d44e686e OZ |
1413 | if ((a->prefix.type != NET_IP6) || |
1414 | (a->flags & IA_SECONDARY) || | |
70945cb6 OZ |
1415 | (a->flags & IA_PEER) || |
1416 | (a->scope <= SCOPE_LINK)) | |
1417 | continue; | |
3b89a232 | 1418 | |
d44e686e | 1419 | if (((a->prefix.pxlen < IP6_MAX_PREFIX_LENGTH) && net_lsa) || |
70945cb6 OZ |
1420 | configured_stubnet(oa, a)) |
1421 | continue; | |
c3226991 | 1422 | |
70945cb6 OZ |
1423 | if ((a->flags & IA_HOST) || |
1424 | (ifa->state == OSPF_IS_LOOP) || | |
1425 | (ifa->type == OSPF_IT_PTMP)) | |
1426 | { | |
d44e686e OZ |
1427 | net_addr_ip6 net = NET_ADDR_IP6(a->ip, IP6_MAX_PREFIX_LENGTH); |
1428 | lsab_put_prefix(p, (net_addr *) &net, 0); | |
70945cb6 | 1429 | host_addr = 1; |
c3226991 | 1430 | } |
70945cb6 | 1431 | else |
d44e686e | 1432 | lsab_put_prefix(p, &a->prefix, ifa->cost); |
70945cb6 OZ |
1433 | i++; |
1434 | } | |
e7b4948c OZ |
1435 | |
1436 | ifa->px_pos_end = i; | |
c3226991 OZ |
1437 | } |
1438 | ||
c3226991 | 1439 | struct ospf_stubnet_config *sn; |
70945cb6 OZ |
1440 | WALK_LIST(sn, oa->ac->stubnet_list) |
1441 | if (!sn->hidden) | |
1442 | { | |
d44e686e OZ |
1443 | lsab_put_prefix(p, &sn->prefix, sn->cost); |
1444 | if (sn->prefix.pxlen == IP6_MAX_PREFIX_LENGTH) | |
70945cb6 OZ |
1445 | host_addr = 1; |
1446 | i++; | |
1447 | } | |
e4404cef OZ |
1448 | |
1449 | /* If there are some configured vlinks, find some global address | |
1450 | (even from another area), which will be used as a vlink endpoint. */ | |
1451 | if (!EMPTY_LIST(cf->vlink_list) && !host_addr) | |
1452 | { | |
70945cb6 | 1453 | WALK_LIST(ifa, p->iface_list) |
e4404cef OZ |
1454 | { |
1455 | if ((ifa->type == OSPF_IT_VLINK) || (ifa->state == OSPF_IS_DOWN)) | |
1456 | continue; | |
1457 | ||
1458 | struct ifa *a; | |
1459 | WALK_LIST(a, ifa->iface->addrs) | |
1460 | { | |
d44e686e OZ |
1461 | if ((a->prefix.type != NET_IP6) || |
1462 | (a->flags & IA_SECONDARY) || | |
1463 | (a->scope <= SCOPE_LINK)) | |
e4404cef OZ |
1464 | continue; |
1465 | ||
1466 | /* Found some IP */ | |
d44e686e OZ |
1467 | net_addr_ip6 net = NET_ADDR_IP6(a->ip, IP6_MAX_PREFIX_LENGTH); |
1468 | lsab_put_prefix(p, (net_addr *) &net, 0); | |
c3226991 | 1469 | i++; |
e4404cef | 1470 | goto done; |
c3226991 | 1471 | } |
e4404cef OZ |
1472 | } |
1473 | } | |
c3226991 | 1474 | |
e4404cef | 1475 | done: |
70945cb6 | 1476 | lp = p->lsab; |
c3226991 | 1477 | lp->pxcount = i; |
c3226991 OZ |
1478 | } |
1479 | ||
70945cb6 OZ |
1480 | static void |
1481 | ospf_originate_prefix_rt_lsa(struct ospf_proto *p, struct ospf_area *oa) | |
c3226991 | 1482 | { |
70945cb6 OZ |
1483 | if (ospf_is_v2(p)) |
1484 | return; | |
c3226991 | 1485 | |
70945cb6 OZ |
1486 | struct ospf_new_lsa lsa = { |
1487 | .type = LSA_T_PREFIX, | |
1488 | .dom = oa->areaid, | |
1489 | .id = 0 | |
1490 | }; | |
be862406 | 1491 | |
70945cb6 | 1492 | prepare_prefix_rt_lsa_body(p, oa); |
c3226991 | 1493 | |
70945cb6 | 1494 | ospf_originate_lsa(p, &lsa); |
c3226991 OZ |
1495 | } |
1496 | ||
1497 | ||
70945cb6 OZ |
1498 | /* |
1499 | * Prefix-Net-LSA handling (assume OSPFv3) | |
1500 | * Type = LSA_T_PREFIX, referred type = LSA_T_NET | |
1501 | */ | |
1502 | ||
c3226991 OZ |
1503 | static inline int |
1504 | prefix_space(u32 *buf) | |
1505 | { | |
1506 | int pxl = *buf >> 24; | |
1507 | return IPV6_PREFIX_SPACE(pxl); | |
1508 | } | |
1509 | ||
1510 | static inline int | |
1511 | prefix_same(u32 *b1, u32 *b2) | |
1512 | { | |
1513 | int pxl1 = *b1 >> 24; | |
1514 | int pxl2 = *b2 >> 24; | |
1515 | int pxs, i; | |
742029eb | 1516 | |
c3226991 OZ |
1517 | if (pxl1 != pxl2) |
1518 | return 0; | |
1519 | ||
1520 | pxs = IPV6_PREFIX_WORDS(pxl1); | |
1521 | for (i = 1; i < pxs; i++) | |
1522 | if (b1[i] != b2[i]) | |
1523 | return 0; | |
1524 | ||
1525 | return 1; | |
1526 | } | |
1527 | ||
1528 | static inline u32 * | |
1529 | prefix_advance(u32 *buf) | |
1530 | { | |
be862406 OZ |
1531 | int pxl = *buf >> 24; |
1532 | return buf + IPV6_PREFIX_WORDS(pxl); | |
c3226991 OZ |
1533 | } |
1534 | ||
2918e610 | 1535 | /* FIXME eliminate items with LA bit set? see 4.4.3.9 */ |
c3226991 | 1536 | static void |
70945cb6 | 1537 | add_prefix(struct ospf_proto *p, u32 *px, int offset, int *pxc) |
c3226991 | 1538 | { |
70945cb6 | 1539 | u32 *pxl = lsab_offset(p, offset); |
c3226991 | 1540 | int i; |
e4404cef OZ |
1541 | for (i = 0; i < *pxc; pxl = prefix_advance(pxl), i++) |
1542 | if (prefix_same(px, pxl)) | |
c3226991 | 1543 | { |
e4404cef OZ |
1544 | /* Options should be logically OR'ed together */ |
1545 | *pxl |= (*px & 0x00FF0000); | |
1546 | return; | |
c3226991 OZ |
1547 | } |
1548 | ||
70945cb6 | 1549 | ASSERT(pxl == lsab_end(p)); |
c3226991 OZ |
1550 | |
1551 | int pxspace = prefix_space(px); | |
70945cb6 | 1552 | pxl = lsab_alloc(p, pxspace); |
c3226991 | 1553 | memcpy(pxl, px, pxspace); |
e4404cef | 1554 | *pxl &= 0xFFFF0000; /* Set metric to zero */ |
c3226991 OZ |
1555 | (*pxc)++; |
1556 | } | |
1557 | ||
be862406 | 1558 | static void |
70945cb6 | 1559 | add_link_lsa(struct ospf_proto *p, struct ospf_lsa_link *ll, int offset, int *pxc) |
be862406 | 1560 | { |
be862406 | 1561 | u32 *pxb = ll->rest; |
3e236955 | 1562 | uint j; |
be862406 | 1563 | |
e4404cef OZ |
1564 | for (j = 0; j < ll->pxcount; pxb = prefix_advance(pxb), j++) |
1565 | { | |
1566 | u8 pxlen = (pxb[0] >> 24); | |
1567 | u8 pxopts = (pxb[0] >> 16); | |
1568 | ||
1569 | /* Skip NU or LA prefixes */ | |
1570 | if (pxopts & (OPT_PX_NU | OPT_PX_LA)) | |
1571 | continue; | |
1572 | ||
1573 | /* Skip link-local prefixes */ | |
1574 | if ((pxlen >= 10) && ((pxb[1] & 0xffc00000) == 0xfe800000)) | |
1575 | continue; | |
1576 | ||
70945cb6 | 1577 | add_prefix(p, pxb, offset, pxc); |
e4404cef | 1578 | } |
be862406 OZ |
1579 | } |
1580 | ||
70945cb6 OZ |
1581 | static void |
1582 | prepare_prefix_net_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa) | |
c3226991 | 1583 | { |
c3226991 | 1584 | struct ospf_lsa_prefix *lp; |
c3226991 OZ |
1585 | struct ospf_neighbor *n; |
1586 | struct top_hash_entry *en; | |
be862406 | 1587 | int pxc, offset; |
c3226991 | 1588 | |
70945cb6 OZ |
1589 | ASSERT(p->lsab_used == 0); |
1590 | lp = lsab_allocz(p, sizeof(struct ospf_lsa_prefix)); | |
c3226991 OZ |
1591 | lp->ref_type = LSA_T_NET; |
1592 | lp->ref_id = ifa->net_lsa->lsa.id; | |
70945cb6 | 1593 | lp->ref_rt = p->router_id; |
c3226991 OZ |
1594 | lp = NULL; /* buffer might be reallocated later */ |
1595 | ||
be862406 | 1596 | pxc = 0; |
70945cb6 | 1597 | offset = p->lsab_used; |
c3226991 | 1598 | |
be862406 | 1599 | /* Find all Link LSAs associated with the link and merge their prefixes */ |
70945cb6 OZ |
1600 | if (en = ifa->link_lsa) |
1601 | add_link_lsa(p, en->next_lsa_body ?: en->lsa_body, offset, &pxc); | |
be862406 | 1602 | |
c3226991 OZ |
1603 | WALK_LIST(n, ifa->neigh_list) |
1604 | if ((n->state == NEIGHBOR_FULL) && | |
742029eb | 1605 | (en = ospf_hash_find(p->gr, ifa->iface_id, n->iface_id, n->rid, LSA_T_LINK))) |
70945cb6 | 1606 | add_link_lsa(p, en->lsa_body, offset, &pxc); |
c3226991 | 1607 | |
70945cb6 | 1608 | lp = p->lsab; |
be862406 | 1609 | lp->pxcount = pxc; |
c3226991 OZ |
1610 | } |
1611 | ||
70945cb6 OZ |
1612 | static void |
1613 | ospf_originate_prefix_net_lsa(struct ospf_proto *p, struct ospf_iface *ifa) | |
c3226991 | 1614 | { |
70945cb6 OZ |
1615 | if (ospf_is_v2(p)) |
1616 | return; | |
c3226991 | 1617 | |
70945cb6 OZ |
1618 | struct ospf_new_lsa lsa = { |
1619 | .type = LSA_T_PREFIX, | |
1620 | .dom = ifa->oa->areaid, | |
1621 | .id = ifa->iface_id, | |
1622 | .ifa = ifa | |
1623 | }; | |
be862406 | 1624 | |
70945cb6 | 1625 | prepare_prefix_net_lsa_body(p, ifa); |
c3226991 | 1626 | |
70945cb6 | 1627 | ifa->pxn_lsa = ospf_originate_lsa(p, &lsa); |
c3226991 OZ |
1628 | } |
1629 | ||
a7a7372a OZ |
1630 | static inline int breaks_minlsinterval(struct top_hash_entry *en) |
1631 | { return en && (en->lsa.age < LSA_MAXAGE) && ((en->inst_time + MINLSINTERVAL) > now); } | |
70945cb6 | 1632 | |
061ab802 | 1633 | void |
70945cb6 | 1634 | ospf_update_topology(struct ospf_proto *p) |
061ab802 | 1635 | { |
70945cb6 OZ |
1636 | struct ospf_area *oa; |
1637 | struct ospf_iface *ifa; | |
061ab802 | 1638 | |
70945cb6 OZ |
1639 | WALK_LIST(oa, p->area_list) |
1640 | { | |
1641 | if (oa->update_rt_lsa) | |
1642 | { | |
a7a7372a OZ |
1643 | /* |
1644 | * Generally, MinLSInterval is enforced in ospf_do_originate_lsa(), but | |
1645 | * origination of (prefix) router LSA is a special case. We do not want to | |
1646 | * prepare a new router LSA body and then postpone it in en->next_lsa_body | |
1647 | * for later origination, because there are side effects (updates of | |
1648 | * rt_pos_* and px_pos_* in ospf_iface structures) during that, which may | |
1649 | * confuse routing table calculation if executed after LSA body | |
1650 | * preparation but before final LSA origination (as rtcalc would use | |
1651 | * current rt_pos_* indexes but the old router LSA body). | |
1652 | * | |
1653 | * Here, we ensure that MinLSInterval is observed and we do not even try | |
1654 | * to originate these LSAs if it is not. Therefore, origination, when | |
1655 | * requested, will succeed unless there is also a seqnum wrapping, which | |
1656 | * is not a problem because in that case rtcalc is blocked by MaxAge. | |
1657 | */ | |
1658 | ||
1659 | if (breaks_minlsinterval(oa->rt) || breaks_minlsinterval(oa->pxr_lsa)) | |
1660 | continue; | |
1661 | ||
70945cb6 OZ |
1662 | ospf_originate_rt_lsa(p, oa); |
1663 | ospf_originate_prefix_rt_lsa(p, oa); | |
1664 | oa->update_rt_lsa = 0; | |
1665 | } | |
1666 | } | |
061ab802 | 1667 | |
70945cb6 OZ |
1668 | WALK_LIST(ifa, p->iface_list) |
1669 | { | |
1670 | if (ifa->type == OSPF_IT_VLINK) | |
1671 | continue; | |
be862406 | 1672 | |
70945cb6 OZ |
1673 | if (ifa->update_link_lsa) |
1674 | { | |
1675 | if ((ifa->state > OSPF_IS_LOOP) && !ifa->link_lsa_suppression) | |
1676 | ospf_originate_link_lsa(p, ifa); | |
1677 | else | |
1678 | ospf_flush2_lsa(p, &ifa->link_lsa); | |
061ab802 | 1679 | |
70945cb6 OZ |
1680 | ifa->update_link_lsa = 0; |
1681 | } | |
061ab802 | 1682 | |
70945cb6 OZ |
1683 | if (ifa->update_net_lsa) |
1684 | { | |
1685 | if ((ifa->state == OSPF_IS_DR) && (ifa->fadj > 0)) | |
1686 | { | |
1687 | ospf_originate_net_lsa(p, ifa); | |
1688 | ospf_originate_prefix_net_lsa(p, ifa); | |
1689 | } | |
1690 | else | |
1691 | { | |
1692 | ospf_flush2_lsa(p, &ifa->net_lsa); | |
1693 | ospf_flush2_lsa(p, &ifa->pxn_lsa); | |
1694 | } | |
1695 | ||
1696 | ifa->update_net_lsa = 0; | |
1697 | } | |
1698 | } | |
70945cb6 | 1699 | } |
e8085aba | 1700 | |
b49e6f5a | 1701 | |
6ba36f06 MM |
1702 | static void |
1703 | ospf_top_ht_alloc(struct top_graph *f) | |
1704 | { | |
1705 | f->hash_size = 1 << f->hash_order; | |
1706 | f->hash_mask = f->hash_size - 1; | |
1707 | if (f->hash_order > HASH_HI_MAX - HASH_HI_STEP) | |
1708 | f->hash_entries_max = ~0; | |
1709 | else | |
1710 | f->hash_entries_max = f->hash_size HASH_HI_MARK; | |
1711 | if (f->hash_order < HASH_LO_MIN + HASH_LO_STEP) | |
1712 | f->hash_entries_min = 0; | |
1713 | else | |
1714 | f->hash_entries_min = f->hash_size HASH_LO_MARK; | |
1715 | DBG("Allocating OSPF hash of order %d: %d hash_entries, %d low, %d high\n", | |
1716 | f->hash_order, f->hash_size, f->hash_entries_min, f->hash_entries_max); | |
b9ed99f7 OF |
1717 | f->hash_table = |
1718 | mb_alloc(f->pool, f->hash_size * sizeof(struct top_hash_entry *)); | |
6ba36f06 MM |
1719 | bzero(f->hash_table, f->hash_size * sizeof(struct top_hash_entry *)); |
1720 | } | |
1721 | ||
1722 | static inline void | |
1723 | ospf_top_ht_free(struct top_hash_entry **h) | |
1724 | { | |
1725 | mb_free(h); | |
1726 | } | |
1727 | ||
1728 | static inline u32 | |
1729 | ospf_top_hash_u32(u32 a) | |
1730 | { | |
1731 | /* Shamelessly stolen from IP address hashing in ipv4.h */ | |
1732 | a ^= a >> 16; | |
1733 | a ^= a << 10; | |
1734 | return a; | |
1735 | } | |
1736 | ||
a7a7372a | 1737 | static uint |
c3226991 OZ |
1738 | ospf_top_hash(struct top_graph *f, u32 domain, u32 lsaid, u32 rtrid, u32 type) |
1739 | { | |
be862406 | 1740 | /* In OSPFv2, we don't know Router ID when looking for network LSAs. |
9f0ba7b1 OZ |
1741 | In OSPFv3, we don't know LSA ID when looking for router LSAs. |
1742 | In both cases, there is (usually) just one (or small number) | |
1743 | appropriate LSA, so we just clear unknown part of key. */ | |
c3226991 | 1744 | |
70945cb6 OZ |
1745 | return (((f->ospf2 && (type == LSA_T_NET)) ? 0 : ospf_top_hash_u32(rtrid)) + |
1746 | ((!f->ospf2 && (type == LSA_T_RT)) ? 0 : ospf_top_hash_u32(lsaid)) + | |
9f0ba7b1 | 1747 | type + domain) & f->hash_mask; |
c3226991 OZ |
1748 | |
1749 | /* | |
b9ed99f7 | 1750 | return (ospf_top_hash_u32(lsaid) + ospf_top_hash_u32(rtrid) + |
86c84d76 | 1751 | type + areaid) & f->hash_mask; |
c3226991 | 1752 | */ |
6ba36f06 MM |
1753 | } |
1754 | ||
7ab3ff6a OF |
1755 | /** |
1756 | * ospf_top_new - allocated new topology database | |
70945cb6 | 1757 | * @p: OSPF protocol instance |
a7a7372a | 1758 | * @pool: pool for allocation |
7ab3ff6a | 1759 | * |
a7a7372a OZ |
1760 | * This dynamically hashed structure is used for keeping LSAs. Mainly it is used |
1761 | * for the LSA database of the OSPF protocol, but also for LSA retransmission | |
1762 | * and request lists of OSPF neighbors. | |
7ab3ff6a | 1763 | */ |
6ba36f06 | 1764 | struct top_graph * |
a7a7372a | 1765 | ospf_top_new(struct ospf_proto *p, pool *pool) |
6ba36f06 MM |
1766 | { |
1767 | struct top_graph *f; | |
1768 | ||
035f6acb OF |
1769 | f = mb_allocz(pool, sizeof(struct top_graph)); |
1770 | f->pool = pool; | |
6ba36f06 MM |
1771 | f->hash_slab = sl_new(f->pool, sizeof(struct top_hash_entry)); |
1772 | f->hash_order = HASH_DEF_ORDER; | |
1773 | ospf_top_ht_alloc(f); | |
1774 | f->hash_entries = 0; | |
1775 | f->hash_entries_min = 0; | |
a7a7372a | 1776 | f->ospf2 = ospf_is_v2(p); |
6ba36f06 MM |
1777 | return f; |
1778 | } | |
1779 | ||
1780 | void | |
1781 | ospf_top_free(struct top_graph *f) | |
1782 | { | |
1783 | rfree(f->hash_slab); | |
1784 | ospf_top_ht_free(f->hash_table); | |
1785 | mb_free(f); | |
1786 | } | |
1787 | ||
1788 | static void | |
1789 | ospf_top_rehash(struct top_graph *f, int step) | |
1790 | { | |
6ba36f06 | 1791 | struct top_hash_entry **n, **oldt, **newt, *e, *x; |
a7a7372a | 1792 | uint oldn, oldh; |
6ba36f06 MM |
1793 | |
1794 | oldn = f->hash_size; | |
1795 | oldt = f->hash_table; | |
b49e6f5a | 1796 | DBG("re-hashing topology hash from order %d to %d\n", f->hash_order, |
b9ed99f7 | 1797 | f->hash_order + step); |
6ba36f06 MM |
1798 | f->hash_order += step; |
1799 | ospf_top_ht_alloc(f); | |
1800 | newt = f->hash_table; | |
1801 | ||
b9ed99f7 OF |
1802 | for (oldh = 0; oldh < oldn; oldh++) |
1803 | { | |
1804 | e = oldt[oldh]; | |
1805 | while (e) | |
6ba36f06 | 1806 | { |
b9ed99f7 | 1807 | x = e->next; |
70945cb6 | 1808 | n = newt + ospf_top_hash(f, e->domain, e->lsa.id, e->lsa.rt, e->lsa_type); |
b9ed99f7 OF |
1809 | e->next = *n; |
1810 | *n = e; | |
1811 | e = x; | |
6ba36f06 | 1812 | } |
b9ed99f7 | 1813 | } |
6ba36f06 MM |
1814 | ospf_top_ht_free(oldt); |
1815 | } | |
1816 | ||
6f8bbaa1 OZ |
1817 | static struct top_hash_entry * |
1818 | ospf_hash_find_(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type) | |
6ba36f06 | 1819 | { |
86c84d76 | 1820 | struct top_hash_entry *e; |
c3226991 | 1821 | e = f->hash_table[ospf_top_hash(f, domain, lsa, rtr, type)]; |
86c84d76 | 1822 | |
70945cb6 OZ |
1823 | while (e && (e->lsa.id != lsa || e->lsa.rt != rtr || |
1824 | e->lsa_type != type || e->domain != domain)) | |
9f0ba7b1 OZ |
1825 | e = e->next; |
1826 | ||
6f8bbaa1 OZ |
1827 | return e; |
1828 | } | |
1829 | ||
1830 | struct top_hash_entry * | |
1831 | ospf_hash_find(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type) | |
1832 | { | |
1833 | struct top_hash_entry *e = ospf_hash_find_(f, domain, lsa, rtr, type); | |
1834 | ||
70945cb6 | 1835 | /* Hide hash entry with empty lsa_body */ |
a7a7372a | 1836 | return (e && e->lsa_body) ? e : NULL; |
9f0ba7b1 | 1837 | } |
86c84d76 | 1838 | |
70945cb6 OZ |
1839 | /* In OSPFv2, lsa.id is the same as lsa.rt for router LSA. In OSPFv3, we don't know |
1840 | lsa.id when looking for router LSAs. We return matching LSA with smallest lsa.id. */ | |
9f0ba7b1 OZ |
1841 | struct top_hash_entry * |
1842 | ospf_hash_find_rt(struct top_graph *f, u32 domain, u32 rtr) | |
1843 | { | |
1844 | struct top_hash_entry *rv = NULL; | |
1845 | struct top_hash_entry *e; | |
70945cb6 OZ |
1846 | /* We can put rtr for lsa.id to hash fn, it is ignored in OSPFv3 */ |
1847 | e = f->hash_table[ospf_top_hash(f, domain, rtr, rtr, LSA_T_RT)]; | |
1848 | ||
9f0ba7b1 | 1849 | while (e) |
70945cb6 OZ |
1850 | { |
1851 | if (e->lsa.rt == rtr && e->lsa_type == LSA_T_RT && e->domain == domain && e->lsa_body) | |
9f0ba7b1 | 1852 | { |
70945cb6 OZ |
1853 | if (f->ospf2 && (e->lsa.id == rtr)) |
1854 | return e; | |
1855 | if (!f->ospf2 && (!rv || e->lsa.id < rv->lsa.id)) | |
1856 | rv = e; | |
9f0ba7b1 | 1857 | } |
70945cb6 OZ |
1858 | e = e->next; |
1859 | } | |
9f0ba7b1 OZ |
1860 | |
1861 | return rv; | |
1862 | } | |
1863 | ||
a7a7372a OZ |
1864 | /* |
1865 | * ospf_hash_find_rt3_first() and ospf_hash_find_rt3_next() are used exclusively | |
1866 | * for lsa_walk_rt_init(), lsa_walk_rt(), therefore they skip MaxAge entries. | |
1867 | */ | |
9f0ba7b1 | 1868 | static inline struct top_hash_entry * |
70945cb6 | 1869 | find_matching_rt3(struct top_hash_entry *e, u32 domain, u32 rtr) |
9f0ba7b1 | 1870 | { |
70945cb6 | 1871 | while (e && (e->lsa.rt != rtr || e->lsa_type != LSA_T_RT || |
a7a7372a | 1872 | e->domain != domain || e->lsa.age == LSA_MAXAGE)) |
9f0ba7b1 | 1873 | e = e->next; |
6ba36f06 MM |
1874 | return e; |
1875 | } | |
1876 | ||
9f0ba7b1 | 1877 | struct top_hash_entry * |
70945cb6 | 1878 | ospf_hash_find_rt3_first(struct top_graph *f, u32 domain, u32 rtr) |
9f0ba7b1 OZ |
1879 | { |
1880 | struct top_hash_entry *e; | |
1881 | e = f->hash_table[ospf_top_hash(f, domain, 0, rtr, LSA_T_RT)]; | |
70945cb6 | 1882 | return find_matching_rt3(e, domain, rtr); |
9f0ba7b1 OZ |
1883 | } |
1884 | ||
1885 | struct top_hash_entry * | |
70945cb6 | 1886 | ospf_hash_find_rt3_next(struct top_hash_entry *e) |
9f0ba7b1 | 1887 | { |
70945cb6 | 1888 | return find_matching_rt3(e->next, e->domain, e->lsa.rt); |
9f0ba7b1 OZ |
1889 | } |
1890 | ||
70945cb6 OZ |
1891 | /* In OSPFv2, we don't know Router ID when looking for network LSAs. |
1892 | There should be just one, so we find any match. */ | |
1893 | struct top_hash_entry * | |
1894 | ospf_hash_find_net2(struct top_graph *f, u32 domain, u32 id) | |
1895 | { | |
1896 | struct top_hash_entry *e; | |
1897 | e = f->hash_table[ospf_top_hash(f, domain, id, 0, LSA_T_NET)]; | |
1898 | ||
1899 | while (e && (e->lsa.id != id || e->lsa_type != LSA_T_NET || | |
1900 | e->domain != domain || e->lsa_body == NULL)) | |
1901 | e = e->next; | |
1902 | ||
1903 | return e; | |
1904 | } | |
9f0ba7b1 OZ |
1905 | |
1906 | ||
6ba36f06 | 1907 | struct top_hash_entry * |
b49e6f5a | 1908 | ospf_hash_get(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type) |
6ba36f06 | 1909 | { |
86c84d76 OF |
1910 | struct top_hash_entry **ee; |
1911 | struct top_hash_entry *e; | |
86c84d76 | 1912 | |
c3226991 | 1913 | ee = f->hash_table + ospf_top_hash(f, domain, lsa, rtr, type); |
86c84d76 OF |
1914 | e = *ee; |
1915 | ||
742029eb | 1916 | while (e && (e->lsa.id != lsa || e->lsa.rt != rtr || |
70945cb6 | 1917 | e->lsa_type != type || e->domain != domain)) |
c3226991 | 1918 | e = e->next; |
6ba36f06 | 1919 | |
6ba36f06 MM |
1920 | if (e) |
1921 | return e; | |
933bfdde | 1922 | |
6ba36f06 | 1923 | e = sl_alloc(f->hash_slab); |
70945cb6 OZ |
1924 | bzero(e, sizeof(struct top_hash_entry)); |
1925 | ||
933bfdde OF |
1926 | e->color = OUTSPF; |
1927 | e->dist = LSINFINITY; | |
70945cb6 | 1928 | e->lsa.type_raw = type; |
ce17d4c1 OF |
1929 | e->lsa.id = lsa; |
1930 | e->lsa.rt = rtr; | |
70945cb6 OZ |
1931 | e->lsa.sn = LSA_ZEROSEQNO; |
1932 | e->lsa_type = type; | |
c3226991 | 1933 | e->domain = domain; |
933bfdde | 1934 | e->next = *ee; |
b9ed99f7 | 1935 | *ee = e; |
6ba36f06 MM |
1936 | if (f->hash_entries++ > f->hash_entries_max) |
1937 | ospf_top_rehash(f, HASH_HI_STEP); | |
1938 | return e; | |
1939 | } | |
1940 | ||
1941 | void | |
1942 | ospf_hash_delete(struct top_graph *f, struct top_hash_entry *e) | |
1943 | { | |
742029eb | 1944 | struct top_hash_entry **ee = f->hash_table + |
70945cb6 | 1945 | ospf_top_hash(f, e->domain, e->lsa.id, e->lsa.rt, e->lsa_type); |
6ba36f06 MM |
1946 | |
1947 | while (*ee) | |
b9ed99f7 OF |
1948 | { |
1949 | if (*ee == e) | |
6ba36f06 | 1950 | { |
b9ed99f7 OF |
1951 | *ee = e->next; |
1952 | sl_free(f->hash_slab, e); | |
1953 | if (f->hash_entries-- < f->hash_entries_min) | |
1954 | ospf_top_rehash(f, -HASH_LO_STEP); | |
1955 | return; | |
6ba36f06 | 1956 | } |
b9ed99f7 OF |
1957 | ee = &((*ee)->next); |
1958 | } | |
6ba36f06 MM |
1959 | bug("ospf_hash_delete() called for invalid node"); |
1960 | } | |
1961 | ||
e81b440f | 1962 | /* |
226cb2bc OF |
1963 | static void |
1964 | ospf_dump_lsa(struct top_hash_entry *he, struct proto *p) | |
1965 | { | |
e81b440f | 1966 | |
226cb2bc OF |
1967 | struct ospf_lsa_rt *rt = NULL; |
1968 | struct ospf_lsa_rt_link *rr = NULL; | |
1969 | struct ospf_lsa_net *ln = NULL; | |
1970 | u32 *rts = NULL; | |
1971 | u32 i, max; | |
1972 | ||
3aab39f5 OZ |
1973 | OSPF_TRACE(D_EVENTS, "- %1x %-1R %-1R %4u 0x%08x 0x%04x %-1R", |
1974 | he->lsa.type, he->lsa.id, he->lsa.rt, he->lsa.age, he->lsa.sn, | |
c3226991 | 1975 | he->lsa.checksum, he->domain); |
226cb2bc | 1976 | |
b49e6f5a | 1977 | |
226cb2bc OF |
1978 | switch (he->lsa.type) |
1979 | { | |
1980 | case LSA_T_RT: | |
1981 | rt = he->lsa_body; | |
1982 | rr = (struct ospf_lsa_rt_link *) (rt + 1); | |
1983 | ||
c3226991 | 1984 | for (i = 0; i < lsa_rt_items(&he->lsa); i++) |
742029eb | 1985 | OSPF_TRACE(D_EVENTS, " - %1x %-1R %-1R %5u", |
3aab39f5 | 1986 | rr[i].type, rr[i].id, rr[i].data, rr[i].metric); |
226cb2bc OF |
1987 | break; |
1988 | ||
1989 | case LSA_T_NET: | |
1990 | ln = he->lsa_body; | |
1991 | rts = (u32 *) (ln + 1); | |
226cb2bc | 1992 | |
c3226991 | 1993 | for (i = 0; i < lsa_net_items(&he->lsa); i++) |
742029eb | 1994 | OSPF_TRACE(D_EVENTS, " - %-1R", rts[i]); |
226cb2bc OF |
1995 | break; |
1996 | ||
1997 | default: | |
1998 | break; | |
1999 | } | |
2000 | } | |
2001 | ||
6ba36f06 | 2002 | void |
992705f6 | 2003 | ospf_top_dump(struct top_graph *f, struct proto *p) |
6ba36f06 | 2004 | { |
a7a7372a | 2005 | uint i; |
992705f6 | 2006 | OSPF_TRACE(D_EVENTS, "Hash entries: %d", f->hash_entries); |
6ba36f06 | 2007 | |
b9ed99f7 OF |
2008 | for (i = 0; i < f->hash_size; i++) |
2009 | { | |
226cb2bc OF |
2010 | struct top_hash_entry *e; |
2011 | for (e = f->hash_table[i]; e != NULL; e = e->next) | |
2012 | ospf_dump_lsa(e, p); | |
b9ed99f7 | 2013 | } |
6ba36f06 | 2014 | } |
e81b440f | 2015 | */ |