ospf6d/ospf6_lsdb.c

   1 /*
   2  * Copyright (C) 2003 Yasuhiro Ohara
   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
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "memory.h"
  25 #include "log.h"
  26 #include "command.h"
  27 #include "prefix.h"
  28 #include "table.h"
  29 #include "vty.h"
  30
  31 #include "ospf6_proto.h"
  32 #include "ospf6_lsa.h"
  33 #include "ospf6_lsdb.h"
  34 #include "ospf6d.h"
  35
  36 struct ospf6_lsdb *
  37 ospf6_lsdb_create (void *data)
  38 {
  39   struct ospf6_lsdb *lsdb;
  40
  41   lsdb = XCALLOC (MTYPE_OSPF6_LSDB, sizeof (struct ospf6_lsdb));
  42   if (lsdb == NULL)
  43     {
  44       zlog_warn ("Can't malloc lsdb");
  45       return NULL;
  46     }
  47   memset (lsdb, 0, sizeof (struct ospf6_lsdb));
  48
  49   lsdb->data = data;
  50   lsdb->table = route_table_init ();
  51   return lsdb;
  52 }
  53
  54 void
  55 ospf6_lsdb_delete (struct ospf6_lsdb *lsdb)
  56 {
  57   ospf6_lsdb_remove_all (lsdb);
  58   route_table_finish (lsdb->table);
  59   XFREE (MTYPE_OSPF6_LSDB, lsdb);
  60 }
  61
  62 static void
  63 ospf6_lsdb_set_key (struct prefix_ipv6 *key, void *value, int len)
  64 {
  65   assert (key->prefixlen % 8 == 0);
  66
  67   memcpy ((caddr_t) &key->prefix + key->prefixlen / 8,
  68           (caddr_t) value, len);
  69   key->family = AF_INET6;
  70   key->prefixlen += len * 8;
  71 }
  72
  73 #ifndef NDEBUG
  74 static void
  75 _lsdb_count_assert (struct ospf6_lsdb *lsdb)
  76 {
  77   struct ospf6_lsa *debug;
  78   unsigned int num = 0;
  79   for (debug = ospf6_lsdb_head (lsdb); debug;
  80        debug = ospf6_lsdb_next (debug))
  81     num++;
  82
  83   if (num == lsdb->count)
  84     return;
  85
  86   zlog_info ("PANIC !! lsdb[%p]->count = %d, real = %d",
  87              lsdb, lsdb->count, num);
  88   for (debug = ospf6_lsdb_head (lsdb); debug;
  89        debug = ospf6_lsdb_next (debug))
  90     zlog_info ("%p %p %s lsdb[%p]", debug->prev, debug->next, debug->name,
  91                debug->lsdb);
  92   zlog_info ("DUMP END");
  93
  94   assert (num == lsdb->count);
  95 }
  96 #define ospf6_lsdb_count_assert(t) (_lsdb_count_assert (t))
  97 #else /*NDEBUG*/
  98 #define ospf6_lsdb_count_assert(t) ((void) 0)
  99 #endif /*NDEBUG*/
 100
 101 void
 102 ospf6_lsdb_add (struct ospf6_lsa *lsa, struct ospf6_lsdb *lsdb)
 103 {
 104   struct prefix_ipv6 key;
 105   struct route_node *current, *nextnode, *prevnode;
 106   struct ospf6_lsa *next, *prev, *old = NULL;
 107
 108   memset (&key, 0, sizeof (key));
 109   ospf6_lsdb_set_key (&key, &lsa->header->type, sizeof (lsa->header->type));
 110   ospf6_lsdb_set_key (&key, &lsa->header->adv_router,
 111                       sizeof (lsa->header->adv_router));
 112   ospf6_lsdb_set_key (&key, &lsa->header->id, sizeof (lsa->header->id));
 113
 114   current = route_node_get (lsdb->table, (struct prefix *) &key);
 115   old = current->info;
 116   current->info = lsa;
 117   ospf6_lsa_lock (lsa);
 118
 119   if (old)
 120     {
 121       if (old->prev)
 122         old->prev->next = lsa;
 123       if (old->next)
 124         old->next->prev = lsa;
 125       lsa->next = old->next;
 126       lsa->prev = old->prev;
 127     }
 128   else
 129     {
 130       /* next link */
 131       nextnode = current;
 132       route_lock_node (nextnode);
 133       do {
 134         nextnode = route_next (nextnode);
 135       } while (nextnode && nextnode->info == NULL);
 136       if (nextnode == NULL)
 137         lsa->next = NULL;
 138       else
 139         {
 140           next = nextnode->info;
 141           lsa->next = next;
 142           next->prev = lsa;
 143           route_unlock_node (nextnode);
 144         }
 145
 146       /* prev link */
 147       prevnode = current;
 148       route_lock_node (prevnode);
 149       do {
 150         prevnode = route_prev (prevnode);
 151       } while (prevnode && prevnode->info == NULL);
 152       if (prevnode == NULL)
 153         lsa->prev = NULL;
 154       else
 155         {
 156           prev = prevnode->info;
 157           lsa->prev = prev;
 158           prev->next = lsa;
 159           route_unlock_node (prevnode);
 160         }
 161
 162       lsdb->count++;
 163     }
 164
 165   if (old)
 166     {
 167       if (OSPF6_LSA_IS_CHANGED (old, lsa))
 168         {
 169           if (OSPF6_LSA_IS_MAXAGE (lsa))
 170             {
 171               if (lsdb->hook_remove)
 172                 {
 173                   (*lsdb->hook_remove) (old);
 174                   (*lsdb->hook_remove) (lsa);
 175                 }
 176             }
 177           else if (OSPF6_LSA_IS_MAXAGE (old))
 178             {
 179               if (lsdb->hook_add)
 180                 (*lsdb->hook_add) (lsa);
 181             }
 182           else
 183             {
 184               if (lsdb->hook_remove)
 185                 (*lsdb->hook_remove) (old);
 186               if (lsdb->hook_add)
 187                 (*lsdb->hook_add) (lsa);
 188             }
 189         }
 190     }
 191   else if (OSPF6_LSA_IS_MAXAGE (lsa))
 192     {
 193       if (lsdb->hook_remove)
 194         (*lsdb->hook_remove) (lsa);
 195     }
 196   else
 197     {
 198       if (lsdb->hook_add)
 199         (*lsdb->hook_add) (lsa);
 200     }
 201
 202   if (old)
 203     ospf6_lsa_unlock (old);
 204
 205   ospf6_lsdb_count_assert (lsdb);
 206 }
 207
 208 void
 209 ospf6_lsdb_remove (struct ospf6_lsa *lsa, struct ospf6_lsdb *lsdb)
 210 {
 211   struct route_node *node;
 212   struct prefix_ipv6 key;
 213
 214   memset (&key, 0, sizeof (key));
 215   ospf6_lsdb_set_key (&key, &lsa->header->type, sizeof (lsa->header->type));
 216   ospf6_lsdb_set_key (&key, &lsa->header->adv_router,
 217                       sizeof (lsa->header->adv_router));
 218   ospf6_lsdb_set_key (&key, &lsa->header->id, sizeof (lsa->header->id));
 219
 220   node = route_node_lookup (lsdb->table, (struct prefix *) &key);
 221   assert (node && node->info == lsa);
 222
 223   if (lsa->prev)
 224     lsa->prev->next = lsa->next;
 225   if (lsa->next)
 226     lsa->next->prev = lsa->prev;
 227
 228   node->info = NULL;
 229   lsdb->count--;
 230
 231   if (lsdb->hook_remove)
 232     (*lsdb->hook_remove) (lsa);
 233
 234   ospf6_lsa_unlock (lsa);
 235   route_unlock_node (node);
 236
 237   ospf6_lsdb_count_assert (lsdb);
 238 }
 239
 240 struct ospf6_lsa *
 241 ospf6_lsdb_lookup (u_int16_t type, u_int32_t id, u_int32_t adv_router,
 242                    struct ospf6_lsdb *lsdb)
 243 {
 244   struct route_node *node;
 245   struct prefix_ipv6 key;
 246
 247   if (lsdb == NULL)
 248     return NULL;
 249
 250   memset (&key, 0, sizeof (key));
 251   ospf6_lsdb_set_key (&key, &type, sizeof (type));
 252   ospf6_lsdb_set_key (&key, &adv_router, sizeof (adv_router));
 253   ospf6_lsdb_set_key (&key, &id, sizeof (id));
 254
 255   node = route_node_lookup (lsdb->table, (struct prefix *) &key);
 256   if (node == NULL || node->info == NULL)
 257     return NULL;
 258   return (struct ospf6_lsa *) node->info;
 259 }
 260
 261 /* Iteration function */
 262 struct ospf6_lsa *
 263 ospf6_lsdb_head (struct ospf6_lsdb *lsdb)
 264 {
 265   struct route_node *node;
 266
 267   node = route_top (lsdb->table);
 268   if (node == NULL)
 269     return NULL;
 270
 271   /* skip to the existing lsdb entry */
 272   while (node && node->info == NULL)
 273     node = route_next (node);
 274   if (node == NULL)
 275     return NULL;
 276
 277   route_unlock_node (node);
 278   if (node->info)
 279     ospf6_lsa_lock ((struct ospf6_lsa *) node->info);
 280   return (struct ospf6_lsa *) node->info;
 281 }
 282
 283 struct ospf6_lsa *
 284 ospf6_lsdb_next (struct ospf6_lsa *lsa)
 285 {
 286   struct ospf6_lsa *next = lsa->next;
 287
 288   ospf6_lsa_unlock (lsa);
 289   if (next)
 290     ospf6_lsa_lock (next);
 291
 292   return next;
 293 }
 294
 295 /* Macro version of check_bit (). */
 296 #define CHECK_BIT(X,P) ((((u_char *)(X))[(P) / 8]) >> (7 - ((P) % 8)) & 1)
 297
 298 struct ospf6_lsa *
 299 ospf6_lsdb_type_router_head (u_int16_t type, u_int32_t adv_router,
 300                              struct ospf6_lsdb *lsdb)
 301 {
 302   struct route_node *node;
 303   struct prefix_ipv6 key;
 304   struct ospf6_lsa *lsa;
 305
 306   memset (&key, 0, sizeof (key));
 307   ospf6_lsdb_set_key (&key, &type, sizeof (type));
 308   ospf6_lsdb_set_key (&key, &adv_router, sizeof (adv_router));
 309
 310   node = lsdb->table->top;
 311
 312   /* Walk down tree. */
 313   while (node && node->p.prefixlen <= key.prefixlen &&
 314          prefix_match (&node->p, (struct prefix *) &key))
 315     node = node->link[CHECK_BIT(&key.prefix, node->p.prefixlen)];
 316
 317   if (node)
 318     route_lock_node (node);
 319   while (node && node->info == NULL)
 320     node = route_next (node);
 321
 322   if (node == NULL)
 323     return NULL;
 324   else
 325     route_unlock_node (node);
 326
 327   if (! prefix_match ((struct prefix *) &key, &node->p))
 328     return NULL;
 329
 330   lsa = node->info;
 331   ospf6_lsa_lock (lsa);
 332
 333   return lsa;
 334 }
 335
 336 struct ospf6_lsa *
 337 ospf6_lsdb_type_router_next (u_int16_t type, u_int32_t adv_router,
 338                              struct ospf6_lsa *lsa)
 339 {
 340   struct ospf6_lsa *next = lsa->next;
 341
 342   if (next)
 343     {
 344       if (next->header->type != type ||
 345           next->header->adv_router != adv_router)
 346         next = NULL;
 347     }
 348
 349   if (next)
 350     ospf6_lsa_lock (next);
 351   ospf6_lsa_unlock (lsa);
 352   return next;
 353 }
 354
 355 struct ospf6_lsa *
 356 ospf6_lsdb_type_head (u_int16_t type, struct ospf6_lsdb *lsdb)
 357 {
 358   struct route_node *node;
 359   struct prefix_ipv6 key;
 360   struct ospf6_lsa *lsa;
 361
 362   memset (&key, 0, sizeof (key));
 363   ospf6_lsdb_set_key (&key, &type, sizeof (type));
 364
 365   /* Walk down tree. */
 366   node = lsdb->table->top;
 367   while (node && node->p.prefixlen <= key.prefixlen &&
 368          prefix_match (&node->p, (struct prefix *) &key))
 369     node = node->link[CHECK_BIT(&key.prefix, node->p.prefixlen)];
 370
 371   if (node)
 372     route_lock_node (node);
 373   while (node && node->info == NULL)
 374     node = route_next (node);
 375
 376   if (node == NULL)
 377     return NULL;
 378   else
 379     route_unlock_node (node);
 380
 381   if (! prefix_match ((struct prefix *) &key, &node->p))
 382     return NULL;
 383
 384   lsa = node->info;
 385   ospf6_lsa_lock (lsa);
 386
 387   return lsa;
 388 }
 389
 390 struct ospf6_lsa *
 391 ospf6_lsdb_type_next (u_int16_t type, struct ospf6_lsa *lsa)
 392 {
 393   struct ospf6_lsa *next = lsa->next;
 394
 395   if (next)
 396     {
 397       if (next->header->type != type)
 398         next = NULL;
 399     }
 400
 401   if (next)
 402     ospf6_lsa_lock (next);
 403   ospf6_lsa_unlock (lsa);
 404   return next;
 405 }
 406
 407 void
 408 ospf6_lsdb_remove_all (struct ospf6_lsdb *lsdb)
 409 {
 410   struct ospf6_lsa *lsa;
 411   for (lsa = ospf6_lsdb_head (lsdb); lsa; lsa = ospf6_lsdb_next (lsa))
 412     ospf6_lsdb_remove (lsa, lsdb);
 413 }
 414
 415 void
 416 ospf6_lsdb_show (struct vty *vty, int level,
 417                  u_int16_t *type, u_int32_t *id, u_int32_t *adv_router,
 418                  struct ospf6_lsdb *lsdb)
 419 {
 420   struct ospf6_lsa *lsa;
 421   void (*showfunc) (struct vty *, struct ospf6_lsa *) = NULL;
 422
 423   if (level == OSPF6_LSDB_SHOW_LEVEL_NORMAL)
 424     showfunc = ospf6_lsa_show_summary;
 425   else if (level == OSPF6_LSDB_SHOW_LEVEL_DETAIL)
 426     showfunc = ospf6_lsa_show;
 427   else if (level == OSPF6_LSDB_SHOW_LEVEL_INTERNAL)
 428     showfunc = ospf6_lsa_show_internal;
 429   else if (level == OSPF6_LSDB_SHOW_LEVEL_DUMP)
 430     showfunc = ospf6_lsa_show_dump;
 431
 432   if (type && id && adv_router)
 433     {
 434       lsa = ospf6_lsdb_lookup (*type, *id, *adv_router, lsdb);
 435       if (lsa)
 436         {
 437           if (level == OSPF6_LSDB_SHOW_LEVEL_NORMAL)
 438             ospf6_lsa_show (vty, lsa);
 439           else
 440             (*showfunc) (vty, lsa);
 441         }
 442       return;
 443     }
 444
 445   if (level == OSPF6_LSDB_SHOW_LEVEL_NORMAL)
 446     ospf6_lsa_show_summary_header (vty);
 447
 448   if (type && adv_router)
 449     lsa = ospf6_lsdb_type_router_head (*type, *adv_router, lsdb);
 450   else if (type)
 451     lsa = ospf6_lsdb_type_head (*type, lsdb);
 452   else
 453     lsa = ospf6_lsdb_head (lsdb);
 454   while (lsa)
 455     {
 456       if ((! adv_router || lsa->header->adv_router == *adv_router) &&
 457           (! id || lsa->header->id == *id))
 458         (*showfunc) (vty, lsa);
 459
 460       if (type && adv_router)
 461         lsa = ospf6_lsdb_type_router_next (*type, *adv_router, lsa);
 462       else if (type)
 463         lsa = ospf6_lsdb_type_next (*type, lsa);
 464       else
 465         lsa = ospf6_lsdb_next (lsa);
 466     }
 467 }
 468
 469 /* Decide new Link State ID to originate.
 470    note return value is network byte order */
 471 u_int32_t
 472 ospf6_new_ls_id (u_int16_t type, u_int32_t adv_router,
 473                  struct ospf6_lsdb *lsdb)
 474 {
 475   struct ospf6_lsa *lsa;
 476   u_int32_t id = 1;
 477
 478   for (lsa = ospf6_lsdb_type_router_head (type, adv_router, lsdb); lsa;
 479        lsa = ospf6_lsdb_type_router_next (type, adv_router, lsa))
 480     {
 481       if (ntohl (lsa->header->id) < id)
 482         continue;
 483       if (ntohl (lsa->header->id) > id)
 484         break;
 485       id++;
 486     }
 487
 488   return ((u_int32_t) htonl (id));
 489 }
 490
 491 /* Decide new LS sequence number to originate.
 492    note return value is network byte order */
 493 u_int32_t
 494 ospf6_new_ls_seqnum (u_int16_t type, u_int32_t id, u_int32_t adv_router,
 495                      struct ospf6_lsdb *lsdb)
 496 {
 497   struct ospf6_lsa *lsa;
 498   signed long seqnum = 0;
 499
 500   /* if current database copy not found, return InitialSequenceNumber */
 501   lsa = ospf6_lsdb_lookup (type, id, adv_router, lsdb);
 502   if (lsa == NULL)
 503     seqnum = INITIAL_SEQUENCE_NUMBER;
 504   else
 505     seqnum = (signed long) ntohl (lsa->header->seqnum) + 1;
 506
 507   return ((u_int32_t) htonl (seqnum));
 508 }
 509
 510