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718e3744 | 1 | /* OSPF SPF calculation. |
2 | Copyright (C) 1999, 2000 Kunihiro Ishiguro, Toshiaki Takada | |
3 | ||
4 | This file is part of GNU Zebra. | |
5 | ||
6 | GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by the | |
8 | Free Software Foundation; either version 2, or (at your option) any | |
9 | later version. | |
10 | ||
11 | GNU Zebra is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Zebra; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | 02111-1307, USA. */ | |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "thread.h" | |
24 | #include "memory.h" | |
25 | #include "hash.h" | |
26 | #include "linklist.h" | |
27 | #include "prefix.h" | |
28 | #include "if.h" | |
29 | #include "table.h" | |
30 | #include "log.h" | |
31 | #include "sockunion.h" /* for inet_ntop () */ | |
462f20d5 | 32 | #include "pqueue.h" |
718e3744 | 33 | |
34 | #include "ospfd/ospfd.h" | |
35 | #include "ospfd/ospf_interface.h" | |
36 | #include "ospfd/ospf_ism.h" | |
37 | #include "ospfd/ospf_asbr.h" | |
38 | #include "ospfd/ospf_lsa.h" | |
39 | #include "ospfd/ospf_lsdb.h" | |
40 | #include "ospfd/ospf_neighbor.h" | |
41 | #include "ospfd/ospf_nsm.h" | |
42 | #include "ospfd/ospf_spf.h" | |
43 | #include "ospfd/ospf_route.h" | |
44 | #include "ospfd/ospf_ia.h" | |
45 | #include "ospfd/ospf_ase.h" | |
46 | #include "ospfd/ospf_abr.h" | |
47 | #include "ospfd/ospf_dump.h" | |
48 | ||
cf744958 DS |
49 | /* Variables to ensure a SPF scheduled log message is printed only once */ |
50 | ||
51 | static unsigned int spf_reason_flags = 0; | |
52 | ||
d3a9c768 PJ |
53 | static void |
54 | ospf_clear_spf_reason_flags (void) | |
cf744958 DS |
55 | { |
56 | spf_reason_flags = 0; | |
57 | } | |
58 | ||
d3a9c768 PJ |
59 | static void |
60 | ospf_spf_set_reason (ospf_spf_reason_t reason) | |
cf744958 | 61 | { |
d3a9c768 | 62 | spf_reason_flags |= 1 << reason; |
cf744958 DS |
63 | } |
64 | ||
65 | static void | |
66 | ospf_get_spf_reason_str (char *buf) | |
67 | { | |
d3a9c768 PJ |
68 | if (!buf) |
69 | return; | |
70 | ||
71 | buf[0] = '\0'; | |
72 | if (spf_reason_flags) | |
cf744958 | 73 | { |
d3a9c768 PJ |
74 | if (spf_reason_flags & SPF_FLAG_ROUTER_LSA_INSTALL) |
75 | strcat (buf, "R, "); | |
76 | if (spf_reason_flags & SPF_FLAG_NETWORK_LSA_INSTALL) | |
77 | strcat (buf, "N, "); | |
78 | if (spf_reason_flags & SPF_FLAG_SUMMARY_LSA_INSTALL) | |
79 | strcat (buf, "S, "); | |
80 | if (spf_reason_flags & SPF_FLAG_ASBR_SUMMARY_LSA_INSTALL) | |
81 | strcat (buf, "AS, "); | |
82 | if (spf_reason_flags & SPF_FLAG_ABR_STATUS_CHANGE) | |
83 | strcat (buf, "ABR, "); | |
84 | if (spf_reason_flags & SPF_FLAG_ASBR_STATUS_CHANGE) | |
85 | strcat (buf, "ASBR, "); | |
86 | if (spf_reason_flags & SPF_FLAG_MAXAGE) | |
87 | strcat (buf, "M, "); | |
cf744958 DS |
88 | buf[strlen(buf)-2] = '\0'; /* skip the last ", " */ |
89 | } | |
90 | } | |
91 | ||
9c27ef9b PJ |
92 | static void ospf_vertex_free (void *); |
93 | /* List of allocated vertices, to simplify cleanup of SPF. | |
94 | * Not thread-safe obviously. If it ever needs to be, it'd have to be | |
95 | * dynamically allocated at begin of ospf_spf_calculate | |
96 | */ | |
97 | static struct list vertex_list = { .del = ospf_vertex_free }; | |
6b0655a2 | 98 | |
462f20d5 | 99 | /* Heap related functions, for the managment of the candidates, to |
100 | * be used with pqueue. */ | |
101 | static int | |
102 | cmp (void * node1 , void * node2) | |
103 | { | |
104 | struct vertex * v1 = (struct vertex *) node1; | |
105 | struct vertex * v2 = (struct vertex *) node2; | |
106 | if (v1 != NULL && v2 != NULL ) | |
9c27ef9b PJ |
107 | { |
108 | /* network vertices must be chosen before router vertices of same | |
109 | * cost in order to find all shortest paths | |
110 | */ | |
111 | if ( ((v1->distance - v2->distance) == 0) | |
112 | && (v1->type != v2->type)) | |
113 | { | |
114 | switch (v1->type) | |
115 | { | |
116 | case OSPF_VERTEX_NETWORK: | |
117 | return -1; | |
118 | case OSPF_VERTEX_ROUTER: | |
119 | return 1; | |
120 | } | |
121 | } | |
122 | else | |
123 | return (v1->distance - v2->distance); | |
124 | } | |
125 | return 0; | |
462f20d5 | 126 | } |
127 | ||
128 | static void | |
eb3da6df | 129 | update_stat (void *node , int position) |
462f20d5 | 130 | { |
eb3da6df | 131 | struct vertex *v = node; |
132 | ||
462f20d5 | 133 | /* Set the status of the vertex, when its position changes. */ |
134 | *(v->stat) = position; | |
135 | } | |
6b0655a2 | 136 | |
4dadc291 | 137 | static struct vertex_nexthop * |
eb3da6df | 138 | vertex_nexthop_new (void) |
718e3744 | 139 | { |
eb3da6df | 140 | return XCALLOC (MTYPE_OSPF_NEXTHOP, sizeof (struct vertex_nexthop)); |
718e3744 | 141 | } |
142 | ||
4dadc291 | 143 | static void |
718e3744 | 144 | vertex_nexthop_free (struct vertex_nexthop *nh) |
145 | { | |
146 | XFREE (MTYPE_OSPF_NEXTHOP, nh); | |
147 | } | |
148 | ||
eb3da6df | 149 | /* Free the canonical nexthop objects for an area, ie the nexthop objects |
9c27ef9b PJ |
150 | * attached to the first-hop router vertices, and any intervening network |
151 | * vertices. | |
eb3da6df | 152 | */ |
153 | static void | |
154 | ospf_canonical_nexthops_free (struct vertex *root) | |
718e3744 | 155 | { |
eb3da6df | 156 | struct listnode *node, *nnode; |
157 | struct vertex *child; | |
158 | ||
159 | for (ALL_LIST_ELEMENTS (root->children, node, nnode, child)) | |
160 | { | |
161 | struct listnode *n2, *nn2; | |
162 | struct vertex_parent *vp; | |
163 | ||
58e1befe | 164 | /* router vertices through an attached network each |
165 | * have a distinct (canonical / not inherited) nexthop | |
166 | * which must be freed. | |
167 | * | |
168 | * A network vertex can only have router vertices as its | |
169 | * children, so only one level of recursion is possible. | |
170 | */ | |
eb3da6df | 171 | if (child->type == OSPF_VERTEX_NETWORK) |
172 | ospf_canonical_nexthops_free (child); | |
173 | ||
58e1befe | 174 | /* Free child nexthops pointing back to this root vertex */ |
eb3da6df | 175 | for (ALL_LIST_ELEMENTS (child->parents, n2, nn2, vp)) |
9c27ef9b | 176 | if (vp->parent == root && vp->nexthop) |
58e1befe | 177 | vertex_nexthop_free (vp->nexthop); |
eb3da6df | 178 | } |
179 | } | |
6b0655a2 | 180 | |
9c27ef9b PJ |
181 | /* TODO: Parent list should be excised, in favour of maintaining only |
182 | * vertex_nexthop, with refcounts. | |
183 | */ | |
eb3da6df | 184 | static struct vertex_parent * |
185 | vertex_parent_new (struct vertex *v, int backlink, struct vertex_nexthop *hop) | |
186 | { | |
187 | struct vertex_parent *new; | |
188 | ||
189 | new = XMALLOC (MTYPE_OSPF_VERTEX_PARENT, sizeof (struct vertex_parent)); | |
190 | ||
191 | if (new == NULL) | |
192 | return NULL; | |
193 | ||
194 | new->parent = v; | |
195 | new->backlink = backlink; | |
196 | new->nexthop = hop; | |
718e3744 | 197 | return new; |
198 | } | |
0c0f9cd5 | 199 | |
eb3da6df | 200 | static void |
9c27ef9b | 201 | vertex_parent_free (void *p) |
eb3da6df | 202 | { |
203 | XFREE (MTYPE_OSPF_VERTEX_PARENT, p); | |
204 | } | |
6b0655a2 | 205 | |
4dadc291 | 206 | static struct vertex * |
718e3744 | 207 | ospf_vertex_new (struct ospf_lsa *lsa) |
208 | { | |
209 | struct vertex *new; | |
210 | ||
eb3da6df | 211 | new = XCALLOC (MTYPE_OSPF_VERTEX, sizeof (struct vertex)); |
718e3744 | 212 | |
213 | new->flags = 0; | |
462f20d5 | 214 | new->stat = &(lsa->stat); |
718e3744 | 215 | new->type = lsa->data->type; |
216 | new->id = lsa->data->id; | |
217 | new->lsa = lsa->data; | |
eb3da6df | 218 | new->children = list_new (); |
219 | new->parents = list_new (); | |
9c27ef9b PJ |
220 | new->parents->del = vertex_parent_free; |
221 | ||
222 | listnode_add (&vertex_list, new); | |
eb3da6df | 223 | |
9c27ef9b PJ |
224 | if (IS_DEBUG_OSPF_EVENT) |
225 | zlog_debug ("%s: Created %s vertex %s", __func__, | |
226 | new->type == OSPF_VERTEX_ROUTER ? "Router" : "Network", | |
227 | inet_ntoa (new->lsa->id)); | |
718e3744 | 228 | return new; |
229 | } | |
230 | ||
4dadc291 | 231 | static void |
9c27ef9b | 232 | ospf_vertex_free (void *data) |
718e3744 | 233 | { |
9c27ef9b | 234 | struct vertex *v = data; |
eb3da6df | 235 | |
9c27ef9b PJ |
236 | if (IS_DEBUG_OSPF_EVENT) |
237 | zlog_debug ("%s: Free %s vertex %s", __func__, | |
238 | v->type == OSPF_VERTEX_ROUTER ? "Router" : "Network", | |
239 | inet_ntoa (v->lsa->id)); | |
7461d459 | 240 | |
9c27ef9b PJ |
241 | /* There should be no parents potentially holding references to this vertex |
242 | * Children however may still be there, but presumably referenced by other | |
243 | * vertices | |
eb3da6df | 244 | */ |
9c27ef9b | 245 | //assert (listcount (v->parents) == 0); |
eb3da6df | 246 | |
9c27ef9b PJ |
247 | if (v->children) |
248 | list_delete (v->children); | |
249 | v->children = NULL; | |
250 | ||
251 | if (v->parents) | |
252 | list_delete (v->parents); | |
eb3da6df | 253 | v->parents = NULL; |
254 | ||
255 | v->lsa = NULL; | |
7461d459 | 256 | |
718e3744 | 257 | XFREE (MTYPE_OSPF_VERTEX, v); |
258 | } | |
259 | ||
4dadc291 | 260 | static void |
eb1ce605 | 261 | ospf_vertex_dump(const char *msg, struct vertex *v, |
eb3da6df | 262 | int print_parents, int print_children) |
630e4807 | 263 | { |
264 | if ( ! IS_DEBUG_OSPF_EVENT) | |
265 | return; | |
266 | ||
eb3da6df | 267 | zlog_debug("%s %s vertex %s distance %u flags %u", |
630e4807 | 268 | msg, |
269 | v->type == OSPF_VERTEX_ROUTER ? "Router" : "Network", | |
270 | inet_ntoa(v->lsa->id), | |
271 | v->distance, | |
630e4807 | 272 | (unsigned int)v->flags); |
273 | ||
eb3da6df | 274 | if (print_parents) |
630e4807 | 275 | { |
1eb8ef25 | 276 | struct listnode *node; |
eb3da6df | 277 | struct vertex_parent *vp; |
1eb8ef25 | 278 | |
eb3da6df | 279 | for (ALL_LIST_ELEMENTS_RO (v->parents, node, vp)) |
630e4807 | 280 | { |
281 | char buf1[BUFSIZ]; | |
eb3da6df | 282 | |
283 | if (vp) | |
630e4807 | 284 | { |
eb3da6df | 285 | zlog_debug ("parent %s backlink %d nexthop %s interface %s", |
286 | inet_ntoa(vp->parent->lsa->id), vp->backlink, | |
287 | inet_ntop(AF_INET, &vp->nexthop->router, buf1, BUFSIZ), | |
288 | vp->nexthop->oi ? IF_NAME(vp->nexthop->oi) : "NULL"); | |
630e4807 | 289 | } |
290 | } | |
291 | } | |
292 | ||
293 | if (print_children) | |
294 | { | |
52dc7ee6 | 295 | struct listnode *cnode; |
1eb8ef25 | 296 | struct vertex *cv; |
297 | ||
eb3da6df | 298 | for (ALL_LIST_ELEMENTS_RO (v->children, cnode, cv)) |
1eb8ef25 | 299 | ospf_vertex_dump(" child:", cv, 0, 0); |
630e4807 | 300 | } |
301 | } | |
302 | ||
303 | ||
304 | /* Add a vertex to the list of children in each of its parents. */ | |
4dadc291 | 305 | static void |
718e3744 | 306 | ospf_vertex_add_parent (struct vertex *v) |
307 | { | |
eb3da6df | 308 | struct vertex_parent *vp; |
52dc7ee6 | 309 | struct listnode *node; |
7461d459 | 310 | |
9c27ef9b | 311 | assert (v && v->parents); |
7461d459 | 312 | |
eb3da6df | 313 | for (ALL_LIST_ELEMENTS_RO (v->parents, node, vp)) |
718e3744 | 314 | { |
eb3da6df | 315 | assert (vp->parent && vp->parent->children); |
7461d459 | 316 | |
718e3744 | 317 | /* No need to add two links from the same parent. */ |
eb3da6df | 318 | if (listnode_lookup (vp->parent->children, v) == NULL) |
319 | listnode_add (vp->parent->children, v); | |
718e3744 | 320 | } |
321 | } | |
6b0655a2 | 322 | |
4dadc291 | 323 | static void |
718e3744 | 324 | ospf_spf_init (struct ospf_area *area) |
325 | { | |
326 | struct vertex *v; | |
9c27ef9b | 327 | |
718e3744 | 328 | /* Create root node. */ |
329 | v = ospf_vertex_new (area->router_lsa_self); | |
bd34fb34 | 330 | |
718e3744 | 331 | area->spf = v; |
332 | ||
333 | /* Reset ABR and ASBR router counts. */ | |
334 | area->abr_count = 0; | |
335 | area->asbr_count = 0; | |
336 | } | |
337 | ||
d355bfa7 | 338 | /* return index of link back to V from W, or -1 if no link found */ |
4dadc291 | 339 | static int |
718e3744 | 340 | ospf_lsa_has_link (struct lsa_header *w, struct lsa_header *v) |
341 | { | |
eb1ce605 | 342 | unsigned int i, length; |
718e3744 | 343 | struct router_lsa *rl; |
344 | struct network_lsa *nl; | |
345 | ||
346 | /* In case of W is Network LSA. */ | |
347 | if (w->type == OSPF_NETWORK_LSA) | |
348 | { | |
349 | if (v->type == OSPF_NETWORK_LSA) | |
d355bfa7 | 350 | return -1; |
718e3744 | 351 | |
352 | nl = (struct network_lsa *) w; | |
353 | length = (ntohs (w->length) - OSPF_LSA_HEADER_SIZE - 4) / 4; | |
0c0f9cd5 | 354 | |
718e3744 | 355 | for (i = 0; i < length; i++) |
356 | if (IPV4_ADDR_SAME (&nl->routers[i], &v->id)) | |
d355bfa7 | 357 | return i; |
358 | return -1; | |
718e3744 | 359 | } |
360 | ||
361 | /* In case of W is Router LSA. */ | |
362 | if (w->type == OSPF_ROUTER_LSA) | |
363 | { | |
364 | rl = (struct router_lsa *) w; | |
365 | ||
366 | length = ntohs (w->length); | |
367 | ||
368 | for (i = 0; | |
0c0f9cd5 | 369 | i < ntohs (rl->links) && length >= sizeof (struct router_lsa); |
370 | i++, length -= 12) | |
718e3744 | 371 | { |
372 | switch (rl->link[i].type) | |
373 | { | |
374 | case LSA_LINK_TYPE_POINTOPOINT: | |
375 | case LSA_LINK_TYPE_VIRTUALLINK: | |
376 | /* Router LSA ID. */ | |
377 | if (v->type == OSPF_ROUTER_LSA && | |
378 | IPV4_ADDR_SAME (&rl->link[i].link_id, &v->id)) | |
379 | { | |
d355bfa7 | 380 | return i; |
718e3744 | 381 | } |
382 | break; | |
383 | case LSA_LINK_TYPE_TRANSIT: | |
384 | /* Network LSA ID. */ | |
385 | if (v->type == OSPF_NETWORK_LSA && | |
386 | IPV4_ADDR_SAME (&rl->link[i].link_id, &v->id)) | |
387 | { | |
d355bfa7 | 388 | return i; |
0c0f9cd5 | 389 | } |
718e3744 | 390 | break; |
391 | case LSA_LINK_TYPE_STUB: | |
eb3da6df | 392 | /* Stub can't lead anywhere, carry on */ |
718e3744 | 393 | continue; |
394 | default: | |
395 | break; | |
396 | } | |
397 | } | |
398 | } | |
d355bfa7 | 399 | return -1; |
718e3744 | 400 | } |
401 | ||
630e4807 | 402 | /* Find the next link after prev_link from v to w. If prev_link is |
403 | * NULL, return the first link from v to w. Ignore stub and virtual links; | |
404 | * these link types will never be returned. | |
405 | */ | |
4dadc291 | 406 | static struct router_lsa_link * |
718e3744 | 407 | ospf_get_next_link (struct vertex *v, struct vertex *w, |
0c0f9cd5 | 408 | struct router_lsa_link *prev_link) |
718e3744 | 409 | { |
410 | u_char *p; | |
411 | u_char *lim; | |
bd540377 | 412 | u_char lsa_type = LSA_LINK_TYPE_TRANSIT; |
718e3744 | 413 | struct router_lsa_link *l; |
414 | ||
bd540377 JT |
415 | if (w->type == OSPF_VERTEX_ROUTER) |
416 | lsa_type = LSA_LINK_TYPE_POINTOPOINT; | |
417 | ||
718e3744 | 418 | if (prev_link == NULL) |
630e4807 | 419 | p = ((u_char *) v->lsa) + OSPF_LSA_HEADER_SIZE + 4; |
718e3744 | 420 | else |
421 | { | |
0c0f9cd5 | 422 | p = (u_char *) prev_link; |
05b7709d DO |
423 | p += (OSPF_ROUTER_LSA_LINK_SIZE + |
424 | (prev_link->m[0].tos_count * OSPF_ROUTER_LSA_TOS_SIZE)); | |
718e3744 | 425 | } |
0c0f9cd5 | 426 | |
718e3744 | 427 | lim = ((u_char *) v->lsa) + ntohs (v->lsa->length); |
428 | ||
429 | while (p < lim) | |
430 | { | |
431 | l = (struct router_lsa_link *) p; | |
432 | ||
05b7709d | 433 | p += (OSPF_ROUTER_LSA_LINK_SIZE + (l->m[0].tos_count * OSPF_ROUTER_LSA_TOS_SIZE)); |
718e3744 | 434 | |
bd540377 | 435 | if (l->m[0].type != lsa_type) |
0c0f9cd5 | 436 | continue; |
718e3744 | 437 | |
438 | if (IPV4_ADDR_SAME (&l->link_id, &w->id)) | |
0c0f9cd5 | 439 | return l; |
718e3744 | 440 | } |
441 | ||
442 | return NULL; | |
443 | } | |
444 | ||
bc20c1a4 PJ |
445 | static void |
446 | ospf_spf_flush_parents (struct vertex *w) | |
447 | { | |
448 | struct vertex_parent *vp; | |
449 | struct listnode *ln, *nn; | |
450 | ||
451 | /* delete the existing nexthops */ | |
452 | for (ALL_LIST_ELEMENTS (w->parents, ln, nn, vp)) | |
453 | { | |
454 | list_delete_node (w->parents, ln); | |
455 | vertex_parent_free (vp); | |
456 | } | |
457 | } | |
458 | ||
75ee0b8e | 459 | /* |
460 | * Consider supplied next-hop for inclusion to the supplied list of | |
461 | * equal-cost next-hops, adjust list as neccessary. | |
bf9392c6 | 462 | */ |
4dadc291 | 463 | static void |
eb3da6df | 464 | ospf_spf_add_parent (struct vertex *v, struct vertex *w, |
bc20c1a4 | 465 | struct vertex_nexthop *newhop, |
bd34fb34 | 466 | unsigned int distance) |
bf9392c6 | 467 | { |
7b92589c DL |
468 | struct vertex_parent *vp, *wp; |
469 | struct listnode *node; | |
eb3da6df | 470 | |
08d3d5b3 | 471 | /* we must have a newhop, and a distance */ |
bd34fb34 | 472 | assert (v && w && newhop); |
08d3d5b3 | 473 | assert (distance); |
eb3da6df | 474 | |
08d3d5b3 PJ |
475 | /* IFF w has already been assigned a distance, then we shouldn't get here |
476 | * unless callers have determined V(l)->W is shortest / equal-shortest | |
477 | * path (0 is a special case distance (no distance yet assigned)). | |
bc20c1a4 | 478 | */ |
08d3d5b3 PJ |
479 | if (w->distance) |
480 | assert (distance <= w->distance); | |
481 | else | |
482 | w->distance = distance; | |
bc20c1a4 | 483 | |
b75ae99e PJ |
484 | if (IS_DEBUG_OSPF_EVENT) |
485 | { | |
486 | char buf[2][INET_ADDRSTRLEN]; | |
487 | zlog_debug ("%s: Adding %s as parent of %s", | |
488 | __func__, | |
489 | inet_ntop(AF_INET, &v->lsa->id, buf[0], sizeof(buf[0])), | |
490 | inet_ntop(AF_INET, &w->lsa->id, buf[1], sizeof(buf[1]))); | |
491 | } | |
492 | ||
bc20c1a4 | 493 | /* Adding parent for a new, better path: flush existing parents from W. */ |
bd34fb34 | 494 | if (distance < w->distance) |
bc20c1a4 | 495 | { |
b75ae99e PJ |
496 | if (IS_DEBUG_OSPF_EVENT) |
497 | zlog_debug ("%s: distance %d better than %d, flushing existing parents", | |
498 | __func__, distance, w->distance); | |
bc20c1a4 | 499 | ospf_spf_flush_parents (w); |
bd34fb34 | 500 | w->distance = distance; |
bc20c1a4 PJ |
501 | } |
502 | ||
7b92589c DL |
503 | /* new parent is <= existing parents, add it to parent list (if nexthop |
504 | * not on parent list) | |
505 | */ | |
506 | for (ALL_LIST_ELEMENTS_RO(w->parents, node, wp)) | |
507 | { | |
508 | if (memcmp(newhop, wp->nexthop, sizeof(*newhop)) == 0) | |
509 | { | |
510 | if (IS_DEBUG_OSPF_EVENT) | |
511 | zlog_debug ("%s: ... nexthop already on parent list, skipping add", __func__); | |
512 | return; | |
513 | } | |
514 | } | |
515 | ||
eb3da6df | 516 | vp = vertex_parent_new (v, ospf_lsa_has_link (w->lsa, v->lsa), newhop); |
517 | listnode_add (w->parents, vp); | |
0c0f9cd5 | 518 | |
eb3da6df | 519 | return; |
520 | } | |
521 | ||
630e4807 | 522 | /* 16.1.1. Calculate nexthop from root through V (parent) to |
bd34fb34 | 523 | * vertex W (destination), with given distance from root->W. |
eb3da6df | 524 | * |
525 | * The link must be supplied if V is the root vertex. In all other cases | |
526 | * it may be NULL. | |
bd34fb34 PJ |
527 | * |
528 | * Note that this function may fail, hence the state of the destination | |
529 | * vertex, W, should /not/ be modified in a dependent manner until | |
530 | * this function returns. This function will update the W vertex with the | |
531 | * provided distance as appropriate. | |
630e4807 | 532 | */ |
bc20c1a4 | 533 | static unsigned int |
eb3da6df | 534 | ospf_nexthop_calculation (struct ospf_area *area, struct vertex *v, |
bd34fb34 | 535 | struct vertex *w, struct router_lsa_link *l, |
c81ee5c9 | 536 | unsigned int distance, int lsa_pos) |
718e3744 | 537 | { |
1eb8ef25 | 538 | struct listnode *node, *nnode; |
eb3da6df | 539 | struct vertex_nexthop *nh; |
540 | struct vertex_parent *vp; | |
718e3744 | 541 | struct ospf_interface *oi = NULL; |
bc20c1a4 | 542 | unsigned int added = 0; |
c81ee5c9 JT |
543 | char buf1[BUFSIZ]; |
544 | char buf2[BUFSIZ]; | |
0c0f9cd5 | 545 | |
718e3744 | 546 | if (IS_DEBUG_OSPF_EVENT) |
630e4807 | 547 | { |
2a42e285 | 548 | zlog_debug ("ospf_nexthop_calculation(): Start"); |
630e4807 | 549 | ospf_vertex_dump("V (parent):", v, 1, 1); |
550 | ospf_vertex_dump("W (dest) :", w, 1, 1); | |
bd34fb34 | 551 | zlog_debug ("V->W distance: %d", distance); |
630e4807 | 552 | } |
718e3744 | 553 | |
718e3744 | 554 | if (v == area->spf) |
9c27ef9b | 555 | { |
630e4807 | 556 | /* 16.1.1 para 4. In the first case, the parent vertex (V) is the |
557 | root (the calculating router itself). This means that the | |
558 | destination is either a directly connected network or directly | |
559 | connected router. The outgoing interface in this case is simply | |
560 | the OSPF interface connecting to the destination network/router. | |
561 | */ | |
562 | ||
c81ee5c9 JT |
563 | /* we *must* be supplied with the link data */ |
564 | assert (l != NULL); | |
565 | oi = ospf_if_lookup_by_lsa_pos (area, lsa_pos); | |
566 | if (!oi) | |
567 | { | |
568 | zlog_debug("%s: OI not found in LSA: lsa_pos:%d link_id:%s link_data:%s", | |
569 | __func__, lsa_pos, | |
570 | inet_ntop (AF_INET, &l->link_id, buf1, BUFSIZ), | |
571 | inet_ntop (AF_INET, &l->link_data, buf2, BUFSIZ)); | |
572 | return 0; | |
573 | } | |
574 | ||
575 | if (IS_DEBUG_OSPF_EVENT) | |
576 | { | |
577 | zlog_debug("%s: considering link:%s " | |
578 | "type:%d link_id:%s link_data:%s", | |
579 | __func__, oi->ifp->name, l->m[0].type, | |
580 | inet_ntop (AF_INET, &l->link_id, buf1, BUFSIZ), | |
581 | inet_ntop (AF_INET, &l->link_data, buf2, BUFSIZ)); | |
582 | } | |
583 | ||
718e3744 | 584 | if (w->type == OSPF_VERTEX_ROUTER) |
0c0f9cd5 | 585 | { |
eb3da6df | 586 | /* l is a link from v to w |
587 | * l2 will be link from w to v | |
588 | */ | |
589 | struct router_lsa_link *l2 = NULL; | |
eb3da6df | 590 | |
591 | if (l->m[0].type == LSA_LINK_TYPE_POINTOPOINT) | |
592 | { | |
c5e0075f | 593 | struct in_addr nexthop = { .s_addr = 0 }; |
c81ee5c9 | 594 | |
eb3da6df | 595 | /* If the destination is a router which connects to |
596 | the calculating router via a Point-to-MultiPoint | |
597 | network, the destination's next hop IP address(es) | |
598 | can be determined by examining the destination's | |
599 | router-LSA: each link pointing back to the | |
600 | calculating router and having a Link Data field | |
601 | belonging to the Point-to-MultiPoint network | |
602 | provides an IP address of the next hop router. | |
603 | ||
604 | At this point l is a link from V to W, and V is the | |
c81ee5c9 JT |
605 | root ("us"). If it is a point-to-multipoint interface, |
606 | then look through the links in the opposite direction (W to V). | |
607 | If any of them have an address that lands within the | |
eb3da6df | 608 | subnet declared by the PtMP link, then that link |
c81ee5c9 | 609 | is a constituent of the PtMP link, and its address is |
eb3da6df | 610 | a nexthop address for V. |
611 | */ | |
c81ee5c9 JT |
612 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) |
613 | { | |
f2b53dac CF |
614 | /* Having nexthop = 0 is tempting, but NOT acceptable. |
615 | It breaks AS-External routes with a forwarding address, | |
616 | since ospf_ase_complete_direct_routes() will mistakenly | |
617 | assume we've reached the last hop and should place the | |
618 | forwarding address as nexthop. | |
619 | Also, users may configure multi-access links in p2p mode, | |
620 | so we need the IP to ARP the nexthop. | |
621 | */ | |
622 | struct ospf_neighbor *nbr_w; | |
623 | ||
624 | nbr_w = ospf_nbr_lookup_by_routerid (oi->nbrs, &l->link_id); | |
625 | if (nbr_w != NULL) | |
626 | { | |
627 | added = 1; | |
628 | nexthop = nbr_w->src; | |
629 | } | |
c81ee5c9 JT |
630 | } |
631 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) | |
632 | { | |
633 | struct prefix_ipv4 la; | |
634 | ||
635 | la.family = AF_INET; | |
636 | la.prefixlen = oi->address->prefixlen; | |
637 | ||
638 | /* V links to W on PtMP interface | |
639 | - find the interface address on W */ | |
640 | while ((l2 = ospf_get_next_link (w, v, l2))) | |
641 | { | |
642 | la.prefix = l2->link_data; | |
643 | ||
644 | if (prefix_cmp ((struct prefix *) &la, | |
645 | oi->address) != 0) | |
646 | continue; | |
647 | /* link_data is on our PtMP network */ | |
648 | added = 1; | |
649 | nexthop = l2->link_data; | |
650 | break; | |
651 | } | |
652 | } | |
653 | ||
654 | if (added) | |
eb3da6df | 655 | { |
656 | /* found all necessary info to build nexthop */ | |
657 | nh = vertex_nexthop_new (); | |
658 | nh->oi = oi; | |
c81ee5c9 | 659 | nh->router = nexthop; |
bd34fb34 | 660 | ospf_spf_add_parent (v, w, nh, distance); |
bc20c1a4 | 661 | return 1; |
eb3da6df | 662 | } |
663 | else | |
c81ee5c9 JT |
664 | zlog_info("%s: could not determine nexthop for link %s", |
665 | __func__, oi->ifp->name); | |
9c27ef9b PJ |
666 | } /* end point-to-point link from V to W */ |
667 | else if (l->m[0].type == LSA_LINK_TYPE_VIRTUALLINK) | |
668 | { | |
669 | struct ospf_vl_data *vl_data; | |
670 | ||
671 | /* VLink implementation limitations: | |
672 | * a) vl_data can only reference one nexthop, so no ECMP | |
673 | * to backbone through VLinks. Though transit-area | |
674 | * summaries may be considered, and those can be ECMP. | |
675 | * b) We can only use /one/ VLink, even if multiple ones | |
676 | * exist this router through multiple transit-areas. | |
677 | */ | |
678 | vl_data = ospf_vl_lookup (area->ospf, NULL, l->link_id); | |
679 | ||
680 | if (vl_data | |
681 | && CHECK_FLAG (vl_data->flags, OSPF_VL_FLAG_APPROVED)) | |
eb3da6df | 682 | { |
9c27ef9b PJ |
683 | nh = vertex_nexthop_new (); |
684 | nh->oi = vl_data->nexthop.oi; | |
685 | nh->router = vl_data->nexthop.router; | |
bd34fb34 | 686 | ospf_spf_add_parent (v, w, nh, distance); |
bc20c1a4 | 687 | return 1; |
eb3da6df | 688 | } |
9c27ef9b | 689 | else |
bc20c1a4 PJ |
690 | zlog_info("ospf_nexthop_calculation(): " |
691 | "vl_data for VL link not found"); | |
9c27ef9b | 692 | } /* end virtual-link from V to W */ |
bc20c1a4 | 693 | return 0; |
630e4807 | 694 | } /* end W is a Router vertex */ |
718e3744 | 695 | else |
0c0f9cd5 | 696 | { |
eb3da6df | 697 | assert(w->type == OSPF_VERTEX_NETWORK); |
c81ee5c9 JT |
698 | |
699 | nh = vertex_nexthop_new (); | |
700 | nh->oi = oi; | |
701 | nh->router.s_addr = 0; /* Nexthop not required */ | |
702 | ospf_spf_add_parent (v, w, nh, distance); | |
703 | return 1; | |
0c0f9cd5 | 704 | } |
630e4807 | 705 | } /* end V is the root */ |
630e4807 | 706 | /* Check if W's parent is a network connected to root. */ |
718e3744 | 707 | else if (v->type == OSPF_VERTEX_NETWORK) |
708 | { | |
630e4807 | 709 | /* See if any of V's parents are the root. */ |
eb3da6df | 710 | for (ALL_LIST_ELEMENTS (v->parents, node, nnode, vp)) |
718e3744 | 711 | { |
eb3da6df | 712 | if (vp->parent == area->spf) /* connects to root? */ |
630e4807 | 713 | { |
714 | /* 16.1.1 para 5. ...the parent vertex is a network that | |
715 | * directly connects the calculating router to the destination | |
716 | * router. The list of next hops is then determined by | |
717 | * examining the destination's router-LSA... | |
718 | */ | |
719 | ||
720 | assert(w->type == OSPF_VERTEX_ROUTER); | |
0c0f9cd5 | 721 | while ((l = ospf_get_next_link (w, v, l))) |
722 | { | |
630e4807 | 723 | /* ...For each link in the router-LSA that points back to the |
724 | * parent network, the link's Link Data field provides the IP | |
725 | * address of a next hop router. The outgoing interface to | |
726 | * use can then be derived from the next hop IP address (or | |
727 | * it can be inherited from the parent network). | |
728 | */ | |
eb3da6df | 729 | nh = vertex_nexthop_new (); |
730 | nh->oi = vp->nexthop->oi; | |
731 | nh->router = l->link_data; | |
bc20c1a4 | 732 | added = 1; |
bd34fb34 | 733 | ospf_spf_add_parent (v, w, nh, distance); |
0c0f9cd5 | 734 | } |
945ea293 PJ |
735 | /* Note lack of return is deliberate. See next comment. */ |
736 | } | |
718e3744 | 737 | } |
945ea293 PJ |
738 | /* NB: This code is non-trivial. |
739 | * | |
740 | * E.g. it is not enough to know that V connects to the root. It is | |
741 | * also important that the while above, looping through all links from | |
742 | * W->V found at least one link, so that we know there is | |
743 | * bi-directional connectivity between V and W (which need not be the | |
744 | * case, e.g. when OSPF has not yet converged fully). Otherwise, if | |
745 | * we /always/ return here, without having checked that root->V->-W | |
746 | * actually resulted in a valid nexthop being created, then we we will | |
747 | * prevent SPF from finding/using higher cost paths. | |
748 | * | |
749 | * It is important, if root->V->W has not been added, that we continue | |
750 | * through to the intervening-router nexthop code below. So as to | |
751 | * ensure other paths to V may be used. This avoids unnecessary | |
752 | * blackholes while OSPF is convergening. | |
753 | * | |
754 | * I.e. we may have arrived at this function, examining V -> W, via | |
755 | * workable paths other than root -> V, and it's important to avoid | |
756 | * getting "confused" by non-working root->V->W path - it's important | |
757 | * to *not* lose the working non-root paths, just because of a | |
758 | * non-viable root->V->W. | |
759 | * | |
760 | * See also bug #330 (required reading!), and: | |
761 | * | |
762 | * http://blogs.oracle.com/paulj/entry/the_difference_a_line_makes | |
763 | */ | |
764 | if (added) | |
765 | return added; | |
718e3744 | 766 | } |
767 | ||
630e4807 | 768 | /* 16.1.1 para 4. If there is at least one intervening router in the |
769 | * current shortest path between the destination and the root, the | |
770 | * destination simply inherits the set of next hops from the | |
771 | * parent. | |
772 | */ | |
b75ae99e PJ |
773 | if (IS_DEBUG_OSPF_EVENT) |
774 | zlog_debug ("%s: Intervening routers, adding parent(s)", __func__); | |
775 | ||
eb3da6df | 776 | for (ALL_LIST_ELEMENTS (v->parents, node, nnode, vp)) |
bc20c1a4 PJ |
777 | { |
778 | added = 1; | |
bd34fb34 | 779 | ospf_spf_add_parent (v, w, vp->nexthop, distance); |
bc20c1a4 | 780 | } |
9c27ef9b | 781 | |
bc20c1a4 | 782 | return added; |
718e3744 | 783 | } |
784 | ||
630e4807 | 785 | /* RFC2328 Section 16.1 (2). |
786 | * v is on the SPF tree. Examine the links in v's LSA. Update the list | |
787 | * of candidates with any vertices not already on the list. If a lower-cost | |
788 | * path is found to a vertex already on the candidate list, store the new cost. | |
789 | */ | |
4dadc291 | 790 | static void |
718e3744 | 791 | ospf_spf_next (struct vertex *v, struct ospf_area *area, |
462f20d5 | 792 | struct pqueue * candidate) |
718e3744 | 793 | { |
794 | struct ospf_lsa *w_lsa = NULL; | |
718e3744 | 795 | u_char *p; |
796 | u_char *lim; | |
797 | struct router_lsa_link *l = NULL; | |
798 | struct in_addr *r; | |
c81ee5c9 | 799 | int type = 0, lsa_pos=-1, lsa_pos_next=0; |
718e3744 | 800 | |
801 | /* If this is a router-LSA, and bit V of the router-LSA (see Section | |
802 | A.4.2:RFC2328) is set, set Area A's TransitCapability to TRUE. */ | |
803 | if (v->type == OSPF_VERTEX_ROUTER) | |
804 | { | |
805 | if (IS_ROUTER_LSA_VIRTUAL ((struct router_lsa *) v->lsa)) | |
806 | area->transit = OSPF_TRANSIT_TRUE; | |
807 | } | |
b75ae99e PJ |
808 | |
809 | if (IS_DEBUG_OSPF_EVENT) | |
810 | zlog_debug ("%s: Next vertex of %s vertex %s", | |
811 | __func__, | |
812 | v->type == OSPF_VERTEX_ROUTER ? "Router" : "Network", | |
813 | inet_ntoa(v->lsa->id)); | |
814 | ||
718e3744 | 815 | p = ((u_char *) v->lsa) + OSPF_LSA_HEADER_SIZE + 4; |
0c0f9cd5 | 816 | lim = ((u_char *) v->lsa) + ntohs (v->lsa->length); |
817 | ||
718e3744 | 818 | while (p < lim) |
819 | { | |
eb3da6df | 820 | struct vertex *w; |
821 | unsigned int distance; | |
d355bfa7 | 822 | |
718e3744 | 823 | /* In case of V is Router-LSA. */ |
824 | if (v->lsa->type == OSPF_ROUTER_LSA) | |
825 | { | |
826 | l = (struct router_lsa_link *) p; | |
827 | ||
c81ee5c9 JT |
828 | lsa_pos = lsa_pos_next; /* LSA link position */ |
829 | lsa_pos_next++; | |
05b7709d DO |
830 | p += (OSPF_ROUTER_LSA_LINK_SIZE + |
831 | (l->m[0].tos_count * OSPF_ROUTER_LSA_TOS_SIZE)); | |
718e3744 | 832 | |
833 | /* (a) If this is a link to a stub network, examine the next | |
834 | link in V's LSA. Links to stub networks will be | |
835 | considered in the second stage of the shortest path | |
836 | calculation. */ | |
837 | if ((type = l->m[0].type) == LSA_LINK_TYPE_STUB) | |
838 | continue; | |
08d3d5b3 | 839 | |
718e3744 | 840 | /* (b) Otherwise, W is a transit vertex (router or transit |
841 | network). Look up the vertex W's LSA (router-LSA or | |
842 | network-LSA) in Area A's link state database. */ | |
843 | switch (type) | |
844 | { | |
845 | case LSA_LINK_TYPE_POINTOPOINT: | |
846 | case LSA_LINK_TYPE_VIRTUALLINK: | |
847 | if (type == LSA_LINK_TYPE_VIRTUALLINK) | |
0c0f9cd5 | 848 | { |
849 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 850 | zlog_debug ("looking up LSA through VL: %s", |
0c0f9cd5 | 851 | inet_ntoa (l->link_id)); |
852 | } | |
718e3744 | 853 | |
854 | w_lsa = ospf_lsa_lookup (area, OSPF_ROUTER_LSA, l->link_id, | |
855 | l->link_id); | |
856 | if (w_lsa) | |
0c0f9cd5 | 857 | { |
858 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 859 | zlog_debug ("found Router LSA %s", inet_ntoa (l->link_id)); |
0c0f9cd5 | 860 | } |
718e3744 | 861 | break; |
862 | case LSA_LINK_TYPE_TRANSIT: | |
0c0f9cd5 | 863 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 864 | zlog_debug ("Looking up Network LSA, ID: %s", |
0c0f9cd5 | 865 | inet_ntoa (l->link_id)); |
718e3744 | 866 | w_lsa = ospf_lsa_lookup_by_id (area, OSPF_NETWORK_LSA, |
0c0f9cd5 | 867 | l->link_id); |
718e3744 | 868 | if (w_lsa) |
0c0f9cd5 | 869 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 870 | zlog_debug ("found the LSA"); |
718e3744 | 871 | break; |
872 | default: | |
0c0f9cd5 | 873 | zlog_warn ("Invalid LSA link type %d", type); |
718e3744 | 874 | continue; |
875 | } | |
876 | } | |
877 | else | |
878 | { | |
879 | /* In case of V is Network-LSA. */ | |
0c0f9cd5 | 880 | r = (struct in_addr *) p; |
718e3744 | 881 | p += sizeof (struct in_addr); |
882 | ||
883 | /* Lookup the vertex W's LSA. */ | |
884 | w_lsa = ospf_lsa_lookup_by_id (area, OSPF_ROUTER_LSA, *r); | |
b75ae99e PJ |
885 | if (w_lsa) |
886 | { | |
887 | if (IS_DEBUG_OSPF_EVENT) | |
888 | zlog_debug ("found Router LSA %s", inet_ntoa (w_lsa->data->id)); | |
889 | } | |
718e3744 | 890 | } |
891 | ||
892 | /* (b cont.) If the LSA does not exist, or its LS age is equal | |
893 | to MaxAge, or it does not have a link back to vertex V, | |
894 | examine the next link in V's LSA.[23] */ | |
895 | if (w_lsa == NULL) | |
b75ae99e PJ |
896 | { |
897 | if (IS_DEBUG_OSPF_EVENT) | |
898 | zlog_debug ("No LSA found"); | |
899 | continue; | |
900 | } | |
718e3744 | 901 | |
902 | if (IS_LSA_MAXAGE (w_lsa)) | |
b75ae99e PJ |
903 | { |
904 | if (IS_DEBUG_OSPF_EVENT) | |
905 | zlog_debug ("LSA is MaxAge"); | |
906 | continue; | |
907 | } | |
718e3744 | 908 | |
eb3da6df | 909 | if (ospf_lsa_has_link (w_lsa->data, v->lsa) < 0 ) |
718e3744 | 910 | { |
0c0f9cd5 | 911 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 912 | zlog_debug ("The LSA doesn't have a link back"); |
718e3744 | 913 | continue; |
914 | } | |
915 | ||
916 | /* (c) If vertex W is already on the shortest-path tree, examine | |
917 | the next link in the LSA. */ | |
462f20d5 | 918 | if (w_lsa->stat == LSA_SPF_IN_SPFTREE) |
919 | { | |
920 | if (IS_DEBUG_OSPF_EVENT) | |
921 | zlog_debug ("The LSA is already in SPF"); | |
922 | continue; | |
923 | } | |
718e3744 | 924 | |
925 | /* (d) Calculate the link state cost D of the resulting path | |
926 | from the root to vertex W. D is equal to the sum of the link | |
927 | state cost of the (already calculated) shortest path to | |
928 | vertex V and the advertised cost of the link between vertices | |
929 | V and W. If D is: */ | |
930 | ||
718e3744 | 931 | /* calculate link cost D. */ |
932 | if (v->lsa->type == OSPF_ROUTER_LSA) | |
eb3da6df | 933 | distance = v->distance + ntohs (l->m[0].metric); |
630e4807 | 934 | else /* v is not a Router-LSA */ |
eb3da6df | 935 | distance = v->distance; |
718e3744 | 936 | |
937 | /* Is there already vertex W in candidate list? */ | |
462f20d5 | 938 | if (w_lsa->stat == LSA_SPF_NOT_EXPLORED) |
939 | { | |
eb3da6df | 940 | /* prepare vertex W. */ |
941 | w = ospf_vertex_new (w_lsa); | |
942 | ||
462f20d5 | 943 | /* Calculate nexthop to W. */ |
c81ee5c9 | 944 | if (ospf_nexthop_calculation (area, v, w, l, distance, lsa_pos)) |
bc20c1a4 | 945 | pqueue_enqueue (w, candidate); |
b75ae99e PJ |
946 | else if (IS_DEBUG_OSPF_EVENT) |
947 | zlog_debug ("Nexthop Calc failed"); | |
462f20d5 | 948 | } |
949 | else if (w_lsa->stat >= 0) | |
950 | { | |
951 | /* Get the vertex from candidates. */ | |
eb3da6df | 952 | w = candidate->array[w_lsa->stat]; |
718e3744 | 953 | |
462f20d5 | 954 | /* if D is greater than. */ |
eb3da6df | 955 | if (w->distance < distance) |
718e3744 | 956 | { |
718e3744 | 957 | continue; |
958 | } | |
462f20d5 | 959 | /* equal to. */ |
eb3da6df | 960 | else if (w->distance == distance) |
718e3744 | 961 | { |
eb3da6df | 962 | /* Found an equal-cost path to W. |
963 | * Calculate nexthop of to W from V. */ | |
c81ee5c9 | 964 | ospf_nexthop_calculation (area, v, w, l, distance, lsa_pos); |
718e3744 | 965 | } |
462f20d5 | 966 | /* less than. */ |
967 | else | |
718e3744 | 968 | { |
bc20c1a4 PJ |
969 | /* Found a lower-cost path to W. |
970 | * nexthop_calculation is conditional, if it finds | |
971 | * valid nexthop it will call spf_add_parents, which | |
972 | * will flush the old parents | |
973 | */ | |
c81ee5c9 | 974 | if (ospf_nexthop_calculation (area, v, w, l, distance, lsa_pos)) |
7591d8b8 PJ |
975 | /* Decrease the key of the node in the heap. |
976 | * trickle-sort it up towards root, just in case this | |
977 | * node should now be the new root due the cost change. | |
e95537f0 | 978 | * (next pqueu_{de,en}queue will fully re-heap the queue). |
7591d8b8 PJ |
979 | */ |
980 | trickle_up (w_lsa->stat, candidate); | |
718e3744 | 981 | } |
630e4807 | 982 | } /* end W is already on the candidate list */ |
983 | } /* end loop over the links in V's LSA */ | |
718e3744 | 984 | } |
985 | ||
4dadc291 | 986 | static void |
718e3744 | 987 | ospf_spf_dump (struct vertex *v, int i) |
988 | { | |
52dc7ee6 | 989 | struct listnode *cnode; |
990 | struct listnode *nnode; | |
eb3da6df | 991 | struct vertex_parent *parent; |
718e3744 | 992 | |
993 | if (v->type == OSPF_VERTEX_ROUTER) | |
994 | { | |
995 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 996 | zlog_debug ("SPF Result: %d [R] %s", i, inet_ntoa (v->lsa->id)); |
718e3744 | 997 | } |
998 | else | |
999 | { | |
1000 | struct network_lsa *lsa = (struct network_lsa *) v->lsa; | |
1001 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1002 | zlog_debug ("SPF Result: %d [N] %s/%d", i, inet_ntoa (v->lsa->id), |
0c0f9cd5 | 1003 | ip_masklen (lsa->mask)); |
630e4807 | 1004 | } |
718e3744 | 1005 | |
1eb8ef25 | 1006 | if (IS_DEBUG_OSPF_EVENT) |
eb3da6df | 1007 | for (ALL_LIST_ELEMENTS_RO (v->parents, nnode, parent)) |
1008 | { | |
1009 | zlog_debug (" nexthop %p %s %s", | |
6c4f4e6e | 1010 | (void *)parent->nexthop, |
eb3da6df | 1011 | inet_ntoa (parent->nexthop->router), |
1012 | parent->nexthop->oi ? IF_NAME(parent->nexthop->oi) | |
1013 | : "NULL"); | |
1014 | } | |
718e3744 | 1015 | |
1016 | i++; | |
1017 | ||
eb3da6df | 1018 | for (ALL_LIST_ELEMENTS_RO (v->children, cnode, v)) |
1eb8ef25 | 1019 | ospf_spf_dump (v, i); |
718e3744 | 1020 | } |
1021 | ||
1022 | /* Second stage of SPF calculation. */ | |
4dadc291 | 1023 | static void |
0c0f9cd5 | 1024 | ospf_spf_process_stubs (struct ospf_area *area, struct vertex *v, |
b3bc68e5 PJ |
1025 | struct route_table *rt, |
1026 | int parent_is_root) | |
718e3744 | 1027 | { |
1eb8ef25 | 1028 | struct listnode *cnode, *cnnode; |
718e3744 | 1029 | struct vertex *child; |
1030 | ||
1031 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1032 | zlog_debug ("ospf_process_stub():processing stubs for area %s", |
0c0f9cd5 | 1033 | inet_ntoa (area->area_id)); |
718e3744 | 1034 | if (v->type == OSPF_VERTEX_ROUTER) |
1035 | { | |
1036 | u_char *p; | |
1037 | u_char *lim; | |
1038 | struct router_lsa_link *l; | |
1039 | struct router_lsa *rlsa; | |
57c639f0 | 1040 | int lsa_pos = 0; |
718e3744 | 1041 | |
0c0f9cd5 | 1042 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 1043 | zlog_debug ("ospf_process_stubs():processing router LSA, id: %s", |
0c0f9cd5 | 1044 | inet_ntoa (v->lsa->id)); |
718e3744 | 1045 | rlsa = (struct router_lsa *) v->lsa; |
1046 | ||
1047 | ||
0c0f9cd5 | 1048 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 1049 | zlog_debug ("ospf_process_stubs(): we have %d links to process", |
0c0f9cd5 | 1050 | ntohs (rlsa->links)); |
630e4807 | 1051 | p = ((u_char *) v->lsa) + OSPF_LSA_HEADER_SIZE + 4; |
718e3744 | 1052 | lim = ((u_char *) v->lsa) + ntohs (v->lsa->length); |
1053 | ||
1054 | while (p < lim) | |
1055 | { | |
1056 | l = (struct router_lsa_link *) p; | |
1057 | ||
05b7709d DO |
1058 | p += (OSPF_ROUTER_LSA_LINK_SIZE + |
1059 | (l->m[0].tos_count * OSPF_ROUTER_LSA_TOS_SIZE)); | |
718e3744 | 1060 | |
1061 | if (l->m[0].type == LSA_LINK_TYPE_STUB) | |
57c639f0 JT |
1062 | ospf_intra_add_stub (rt, l, v, area, parent_is_root, lsa_pos); |
1063 | lsa_pos++; | |
718e3744 | 1064 | } |
1065 | } | |
1066 | ||
630e4807 | 1067 | ospf_vertex_dump("ospf_process_stubs(): after examining links: ", v, 1, 1); |
718e3744 | 1068 | |
eb3da6df | 1069 | for (ALL_LIST_ELEMENTS (v->children, cnode, cnnode, child)) |
718e3744 | 1070 | { |
718e3744 | 1071 | if (CHECK_FLAG (child->flags, OSPF_VERTEX_PROCESSED)) |
0c0f9cd5 | 1072 | continue; |
b3bc68e5 PJ |
1073 | |
1074 | /* the first level of routers connected to the root | |
1075 | * should have 'parent_is_root' set, including those | |
1076 | * connected via a network vertex. | |
1077 | */ | |
1078 | if (area->spf == v) | |
1079 | parent_is_root = 1; | |
1080 | else if (v->type == OSPF_VERTEX_ROUTER) | |
1081 | parent_is_root = 0; | |
1082 | ||
1083 | ospf_spf_process_stubs (area, child, rt, parent_is_root); | |
718e3744 | 1084 | |
1085 | SET_FLAG (child->flags, OSPF_VERTEX_PROCESSED); | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | void | |
1090 | ospf_rtrs_free (struct route_table *rtrs) | |
1091 | { | |
1092 | struct route_node *rn; | |
52dc7ee6 | 1093 | struct list *or_list; |
1eb8ef25 | 1094 | struct ospf_route *or; |
1095 | struct listnode *node, *nnode; | |
718e3744 | 1096 | |
1097 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1098 | zlog_debug ("Route: Router Routing Table free"); |
718e3744 | 1099 | |
1100 | for (rn = route_top (rtrs); rn; rn = route_next (rn)) | |
1101 | if ((or_list = rn->info) != NULL) | |
1102 | { | |
1eb8ef25 | 1103 | for (ALL_LIST_ELEMENTS (or_list, node, nnode, or)) |
1104 | ospf_route_free (or); | |
718e3744 | 1105 | |
0c0f9cd5 | 1106 | list_delete (or_list); |
718e3744 | 1107 | |
0c0f9cd5 | 1108 | /* Unlock the node. */ |
1109 | rn->info = NULL; | |
1110 | route_unlock_node (rn); | |
718e3744 | 1111 | } |
1112 | route_table_finish (rtrs); | |
1113 | } | |
1114 | ||
075e12f5 | 1115 | #if 0 |
4dadc291 | 1116 | static void |
718e3744 | 1117 | ospf_rtrs_print (struct route_table *rtrs) |
1118 | { | |
1119 | struct route_node *rn; | |
52dc7ee6 | 1120 | struct list *or_list; |
1121 | struct listnode *ln; | |
1122 | struct listnode *pnode; | |
718e3744 | 1123 | struct ospf_route *or; |
1124 | struct ospf_path *path; | |
1125 | char buf1[BUFSIZ]; | |
1126 | char buf2[BUFSIZ]; | |
1127 | ||
1128 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1129 | zlog_debug ("ospf_rtrs_print() start"); |
718e3744 | 1130 | |
1131 | for (rn = route_top (rtrs); rn; rn = route_next (rn)) | |
1132 | if ((or_list = rn->info) != NULL) | |
1eb8ef25 | 1133 | for (ALL_LIST_ELEMENTS_RO (or_list, ln, or)) |
718e3744 | 1134 | { |
718e3744 | 1135 | switch (or->path_type) |
1136 | { | |
1137 | case OSPF_PATH_INTRA_AREA: | |
0c0f9cd5 | 1138 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 1139 | zlog_debug ("%s [%d] area: %s", |
0c0f9cd5 | 1140 | inet_ntop (AF_INET, &or->id, buf1, BUFSIZ), |
1141 | or->cost, inet_ntop (AF_INET, &or->u.std.area_id, | |
1142 | buf2, BUFSIZ)); | |
718e3744 | 1143 | break; |
1144 | case OSPF_PATH_INTER_AREA: | |
0c0f9cd5 | 1145 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 1146 | zlog_debug ("%s IA [%d] area: %s", |
0c0f9cd5 | 1147 | inet_ntop (AF_INET, &or->id, buf1, BUFSIZ), |
1148 | or->cost, inet_ntop (AF_INET, &or->u.std.area_id, | |
1149 | buf2, BUFSIZ)); | |
718e3744 | 1150 | break; |
1151 | default: | |
1152 | break; | |
1153 | } | |
1154 | ||
1eb8ef25 | 1155 | for (ALL_LIST_ELEMENTS_RO (or->paths, pnode, path)) |
718e3744 | 1156 | { |
718e3744 | 1157 | if (path->nexthop.s_addr == 0) |
0c0f9cd5 | 1158 | { |
1159 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1160 | zlog_debug (" directly attached to %s\r\n", |
a8ba847f | 1161 | ifindex2ifname (path->ifindex)); |
0c0f9cd5 | 1162 | } |
1163 | else | |
1164 | { | |
1165 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1166 | zlog_debug (" via %s, %s\r\n", |
a8ba847f JT |
1167 | inet_ntoa (path->nexthop), |
1168 | ifindex2ifname (path->ifindex)); | |
0c0f9cd5 | 1169 | } |
718e3744 | 1170 | } |
1171 | } | |
1172 | ||
2a42e285 | 1173 | zlog_debug ("ospf_rtrs_print() end"); |
718e3744 | 1174 | } |
075e12f5 | 1175 | #endif |
718e3744 | 1176 | |
1177 | /* Calculating the shortest-path tree for an area. */ | |
4dadc291 | 1178 | static void |
0c0f9cd5 | 1179 | ospf_spf_calculate (struct ospf_area *area, struct route_table *new_table, |
718e3744 | 1180 | struct route_table *new_rtrs) |
1181 | { | |
462f20d5 | 1182 | struct pqueue *candidate; |
718e3744 | 1183 | struct vertex *v; |
eb3da6df | 1184 | |
718e3744 | 1185 | if (IS_DEBUG_OSPF_EVENT) |
1186 | { | |
2a42e285 | 1187 | zlog_debug ("ospf_spf_calculate: Start"); |
1188 | zlog_debug ("ospf_spf_calculate: running Dijkstra for area %s", | |
0c0f9cd5 | 1189 | inet_ntoa (area->area_id)); |
718e3744 | 1190 | } |
1191 | ||
1192 | /* Check router-lsa-self. If self-router-lsa is not yet allocated, | |
1193 | return this area's calculation. */ | |
0c0f9cd5 | 1194 | if (!area->router_lsa_self) |
718e3744 | 1195 | { |
1196 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1197 | zlog_debug ("ospf_spf_calculate: " |
0c0f9cd5 | 1198 | "Skip area %s's calculation due to empty router_lsa_self", |
1199 | inet_ntoa (area->area_id)); | |
718e3744 | 1200 | return; |
1201 | } | |
1202 | ||
1203 | /* RFC2328 16.1. (1). */ | |
0c0f9cd5 | 1204 | /* Initialize the algorithm's data structures. */ |
462f20d5 | 1205 | |
1206 | /* This function scans all the LSA database and set the stat field to | |
1207 | * LSA_SPF_NOT_EXPLORED. */ | |
1208 | ospf_lsdb_clean_stat (area->lsdb); | |
1209 | /* Create a new heap for the candidates. */ | |
1210 | candidate = pqueue_create(); | |
1211 | candidate->cmp = cmp; | |
1212 | candidate->update = update_stat; | |
718e3744 | 1213 | |
1214 | /* Initialize the shortest-path tree to only the root (which is the | |
1215 | router doing the calculation). */ | |
1216 | ospf_spf_init (area); | |
1217 | v = area->spf; | |
462f20d5 | 1218 | /* Set LSA position to LSA_SPF_IN_SPFTREE. This vertex is the root of the |
1219 | * spanning tree. */ | |
1220 | *(v->stat) = LSA_SPF_IN_SPFTREE; | |
718e3744 | 1221 | |
1222 | /* Set Area A's TransitCapability to FALSE. */ | |
1223 | area->transit = OSPF_TRANSIT_FALSE; | |
1224 | area->shortcut_capability = 1; | |
eb3da6df | 1225 | |
718e3744 | 1226 | for (;;) |
1227 | { | |
1228 | /* RFC2328 16.1. (2). */ | |
462f20d5 | 1229 | ospf_spf_next (v, area, candidate); |
718e3744 | 1230 | |
1231 | /* RFC2328 16.1. (3). */ | |
1232 | /* If at this step the candidate list is empty, the shortest- | |
1233 | path tree (of transit vertices) has been completely built and | |
1234 | this stage of the procedure terminates. */ | |
462f20d5 | 1235 | if (candidate->size == 0) |
718e3744 | 1236 | break; |
1237 | ||
1238 | /* Otherwise, choose the vertex belonging to the candidate list | |
1239 | that is closest to the root, and add it to the shortest-path | |
1240 | tree (removing it from the candidate list in the | |
0c0f9cd5 | 1241 | process). */ |
462f20d5 | 1242 | /* Extract from the candidates the node with the lower key. */ |
1243 | v = (struct vertex *) pqueue_dequeue (candidate); | |
1244 | /* Update stat field in vertex. */ | |
1245 | *(v->stat) = LSA_SPF_IN_SPFTREE; | |
eb3da6df | 1246 | |
718e3744 | 1247 | ospf_vertex_add_parent (v); |
1248 | ||
718e3744 | 1249 | /* RFC2328 16.1. (4). */ |
1250 | if (v->type == OSPF_VERTEX_ROUTER) | |
1251 | ospf_intra_add_router (new_rtrs, v, area); | |
0c0f9cd5 | 1252 | else |
718e3744 | 1253 | ospf_intra_add_transit (new_table, v, area); |
1254 | ||
1255 | /* RFC2328 16.1. (5). */ | |
1256 | /* Iterate the algorithm by returning to Step 2. */ | |
630e4807 | 1257 | |
1258 | } /* end loop until no more candidate vertices */ | |
718e3744 | 1259 | |
1260 | if (IS_DEBUG_OSPF_EVENT) | |
1261 | { | |
1262 | ospf_spf_dump (area->spf, 0); | |
1263 | ospf_route_table_dump (new_table); | |
1264 | } | |
1265 | ||
1266 | /* Second stage of SPF calculation procedure's */ | |
b3bc68e5 | 1267 | ospf_spf_process_stubs (area, area->spf, new_table, 0); |
718e3744 | 1268 | |
eb3da6df | 1269 | /* Free candidate queue. */ |
462f20d5 | 1270 | pqueue_delete (candidate); |
cf744958 | 1271 | |
eb3da6df | 1272 | ospf_vertex_dump (__func__, area->spf, 0, 1); |
1273 | /* Free nexthop information, canonical versions of which are attached | |
1274 | * the first level of router vertices attached to the root vertex, see | |
1275 | * ospf_nexthop_calculation. | |
1276 | */ | |
1277 | ospf_canonical_nexthops_free (area->spf); | |
cf744958 | 1278 | |
718e3744 | 1279 | /* Increment SPF Calculation Counter. */ |
1280 | area->spf_calculation++; | |
1281 | ||
2518efd1 | 1282 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &area->ospf->ts_spf); |
cf744958 | 1283 | area->ts_spf = area->ospf->ts_spf; |
718e3744 | 1284 | |
1285 | if (IS_DEBUG_OSPF_EVENT) | |
9c27ef9b PJ |
1286 | zlog_debug ("ospf_spf_calculate: Stop. %ld vertices", |
1287 | mtype_stats_alloc(MTYPE_OSPF_VERTEX)); | |
cf744958 DS |
1288 | |
1289 | /* Free SPF vertices, but not the list. List has ospf_vertex_free | |
1290 | * as deconstructor. | |
1291 | */ | |
1292 | list_delete_all_node (&vertex_list); | |
718e3744 | 1293 | } |
6b0655a2 | 1294 | |
718e3744 | 1295 | /* Timer for SPF calculation. */ |
4dadc291 | 1296 | static int |
68980084 | 1297 | ospf_spf_calculate_timer (struct thread *thread) |
718e3744 | 1298 | { |
68980084 | 1299 | struct ospf *ospf = THREAD_ARG (thread); |
718e3744 | 1300 | struct route_table *new_table, *new_rtrs; |
1eb8ef25 | 1301 | struct ospf_area *area; |
1302 | struct listnode *node, *nnode; | |
cf744958 DS |
1303 | struct timeval start_time, stop_time, spf_start_time; |
1304 | int areas_processed = 0; | |
1305 | unsigned long ia_time, prune_time, rt_time; | |
1306 | unsigned long abr_time, total_spf_time, spf_time; | |
1307 | char rbuf[32]; /* reason_buf */ | |
d3a9c768 | 1308 | |
718e3744 | 1309 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 1310 | zlog_debug ("SPF: Timer (SPF calculation expire)"); |
0c0f9cd5 | 1311 | |
718e3744 | 1312 | ospf->t_spf_calc = NULL; |
1313 | ||
cf744958 | 1314 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &spf_start_time); |
718e3744 | 1315 | /* Allocate new table tree. */ |
1316 | new_table = route_table_init (); | |
0c0f9cd5 | 1317 | new_rtrs = route_table_init (); |
718e3744 | 1318 | |
68980084 | 1319 | ospf_vl_unapprove (ospf); |
718e3744 | 1320 | |
1321 | /* Calculate SPF for each area. */ | |
1eb8ef25 | 1322 | for (ALL_LIST_ELEMENTS (ospf->areas, node, nnode, area)) |
9c27ef9b PJ |
1323 | { |
1324 | /* Do backbone last, so as to first discover intra-area paths | |
1325 | * for any back-bone virtual-links | |
1326 | */ | |
1327 | if (ospf->backbone && ospf->backbone == area) | |
1328 | continue; | |
cf744958 | 1329 | |
9c27ef9b | 1330 | ospf_spf_calculate (area, new_table, new_rtrs); |
cf744958 | 1331 | areas_processed++; |
9c27ef9b | 1332 | } |
cf744958 | 1333 | |
9c27ef9b PJ |
1334 | /* SPF for backbone, if required */ |
1335 | if (ospf->backbone) | |
cf744958 DS |
1336 | { |
1337 | ospf_spf_calculate (ospf->backbone, new_table, new_rtrs); | |
1338 | areas_processed++; | |
1339 | } | |
1340 | ||
1341 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &stop_time); | |
1342 | spf_time = timeval_elapsed (stop_time, spf_start_time); | |
1343 | ||
68980084 | 1344 | ospf_vl_shut_unapproved (ospf); |
718e3744 | 1345 | |
cf744958 DS |
1346 | start_time = stop_time; /* saving a call */ |
1347 | ||
68980084 | 1348 | ospf_ia_routing (ospf, new_table, new_rtrs); |
718e3744 | 1349 | |
cf744958 DS |
1350 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &stop_time); |
1351 | ia_time = timeval_elapsed (stop_time, start_time); | |
1352 | ||
1353 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &start_time); | |
718e3744 | 1354 | ospf_prune_unreachable_networks (new_table); |
1355 | ospf_prune_unreachable_routers (new_rtrs); | |
1356 | ||
cf744958 DS |
1357 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &stop_time); |
1358 | prune_time = timeval_elapsed (stop_time, start_time); | |
718e3744 | 1359 | /* AS-external-LSA calculation should not be performed here. */ |
1360 | ||
1361 | /* If new Router Route is installed, | |
1362 | then schedule re-calculate External routes. */ | |
1363 | if (1) | |
68980084 | 1364 | ospf_ase_calculate_schedule (ospf); |
718e3744 | 1365 | |
68980084 | 1366 | ospf_ase_calculate_timer_add (ospf); |
718e3744 | 1367 | |
cf744958 DS |
1368 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &start_time); |
1369 | ||
718e3744 | 1370 | /* Update routing table. */ |
68980084 | 1371 | ospf_route_install (ospf, new_table); |
718e3744 | 1372 | |
cf744958 DS |
1373 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &stop_time); |
1374 | rt_time = timeval_elapsed (stop_time, start_time); | |
718e3744 | 1375 | /* Update ABR/ASBR routing table */ |
68980084 | 1376 | if (ospf->old_rtrs) |
718e3744 | 1377 | { |
1378 | /* old_rtrs's node holds linked list of ospf_route. --kunihiro. */ | |
68980084 | 1379 | /* ospf_route_delete (ospf->old_rtrs); */ |
1380 | ospf_rtrs_free (ospf->old_rtrs); | |
718e3744 | 1381 | } |
1382 | ||
68980084 | 1383 | ospf->old_rtrs = ospf->new_rtrs; |
1384 | ospf->new_rtrs = new_rtrs; | |
718e3744 | 1385 | |
cf744958 | 1386 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &start_time); |
0c0f9cd5 | 1387 | if (IS_OSPF_ABR (ospf)) |
68980084 | 1388 | ospf_abr_task (ospf); |
718e3744 | 1389 | |
cf744958 DS |
1390 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &stop_time); |
1391 | abr_time = timeval_elapsed (stop_time, start_time); | |
1392 | ||
1393 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &stop_time); | |
1394 | total_spf_time = timeval_elapsed (stop_time, spf_start_time); | |
1395 | ospf->ts_spf_duration.tv_sec = total_spf_time/1000000; | |
1396 | ospf->ts_spf_duration.tv_usec = total_spf_time % 1000000; | |
1397 | ||
1398 | ospf_get_spf_reason_str (rbuf); | |
1399 | ||
d3a9c768 PJ |
1400 | if (IS_DEBUG_OSPF_EVENT) |
1401 | { | |
1402 | zlog_info ("SPF Processing Time(usecs): %ld", total_spf_time); | |
1403 | zlog_info ("\t SPF Time: %ld", spf_time); | |
1404 | zlog_info ("\t InterArea: %ld", ia_time); | |
1405 | zlog_info ("\t Prune: %ld", prune_time); | |
1406 | zlog_info ("\tRouteInstall: %ld", rt_time); | |
1407 | if (IS_OSPF_ABR (ospf)) | |
1408 | zlog_info ("\t ABR: %ld (%d areas)", | |
1409 | abr_time, areas_processed); | |
1410 | zlog_info ("Reason(s) for SPF: %s", rbuf); | |
1411 | } | |
cf744958 DS |
1412 | |
1413 | ospf_clear_spf_reason_flags (); | |
718e3744 | 1414 | |
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | /* Add schedule for SPF calculation. To avoid frequenst SPF calc, we | |
1419 | set timer for SPF calc. */ | |
1420 | void | |
d3a9c768 | 1421 | ospf_spf_calculate_schedule (struct ospf *ospf, ospf_spf_reason_t reason) |
718e3744 | 1422 | { |
d24f6e2a | 1423 | unsigned long delay, elapsed, ht; |
1424 | struct timeval result; | |
718e3744 | 1425 | |
1426 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1427 | zlog_debug ("SPF: calculation timer scheduled"); |
718e3744 | 1428 | |
1429 | /* OSPF instance does not exist. */ | |
68980084 | 1430 | if (ospf == NULL) |
718e3744 | 1431 | return; |
d24f6e2a | 1432 | |
d3a9c768 PJ |
1433 | ospf_spf_set_reason (reason); |
1434 | ||
718e3744 | 1435 | /* SPF calculation timer is already scheduled. */ |
68980084 | 1436 | if (ospf->t_spf_calc) |
718e3744 | 1437 | { |
1438 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1439 | zlog_debug ("SPF: calculation timer is already scheduled: %p", |
6c4f4e6e | 1440 | (void *)ospf->t_spf_calc); |
718e3744 | 1441 | return; |
1442 | } | |
d24f6e2a | 1443 | |
1444 | /* XXX Monotic timers: we only care about relative time here. */ | |
2518efd1 | 1445 | result = tv_sub (recent_relative_time (), ospf->ts_spf); |
d24f6e2a | 1446 | |
1447 | elapsed = (result.tv_sec * 1000) + (result.tv_usec / 1000); | |
1448 | ht = ospf->spf_holdtime * ospf->spf_hold_multiplier; | |
1449 | ||
1450 | if (ht > ospf->spf_max_holdtime) | |
1451 | ht = ospf->spf_max_holdtime; | |
1452 | ||
718e3744 | 1453 | /* Get SPF calculation delay time. */ |
d24f6e2a | 1454 | if (elapsed < ht) |
718e3744 | 1455 | { |
d24f6e2a | 1456 | /* Got an event within the hold time of last SPF. We need to |
1457 | * increase the hold_multiplier, if it's not already at/past | |
1458 | * maximum value, and wasn't already increased.. | |
1459 | */ | |
1460 | if (ht < ospf->spf_max_holdtime) | |
1461 | ospf->spf_hold_multiplier++; | |
1462 | ||
1463 | /* always honour the SPF initial delay */ | |
1464 | if ( (ht - elapsed) < ospf->spf_delay) | |
0c0f9cd5 | 1465 | delay = ospf->spf_delay; |
718e3744 | 1466 | else |
d24f6e2a | 1467 | delay = ht - elapsed; |
718e3744 | 1468 | } |
1469 | else | |
d24f6e2a | 1470 | { |
1471 | /* Event is past required hold-time of last SPF */ | |
1472 | delay = ospf->spf_delay; | |
1473 | ospf->spf_hold_multiplier = 1; | |
1474 | } | |
1475 | ||
718e3744 | 1476 | if (IS_DEBUG_OSPF_EVENT) |
d24f6e2a | 1477 | zlog_debug ("SPF: calculation timer delay = %ld", delay); |
1478 | ||
cf744958 DS |
1479 | zlog_info ("SPF: Scheduled in %ld msec", delay); |
1480 | ||
68980084 | 1481 | ospf->t_spf_calc = |
d24f6e2a | 1482 | thread_add_timer_msec (master, ospf_spf_calculate_timer, ospf, delay); |
718e3744 | 1483 | } |