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 along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <zebra.h>
  22
  23 #include "memory.h"
  24 #include "log.h"
  25 #include "command.h"
  26 #include "prefix.h"
  27 #include "table.h"
  28 #include "vty.h"
  29
  30 #include "ospf6_proto.h"
  31 #include "ospf6_lsa.h"
  32 #include "ospf6_lsdb.h"
  33 #include "ospf6_asbr.h"
  34 #include "ospf6_route.h"
  35 #include "ospf6d.h"
  36 #include "bitfield.h"
  37
  38 DEFINE_MTYPE_STATIC(OSPF6D, OSPF6_LSDB, "OSPF6 LSA database");
  39
  40 struct ospf6_lsdb *ospf6_lsdb_create(void *data)
  41 {
  42         struct ospf6_lsdb *lsdb;
  43
  44         lsdb = XCALLOC(MTYPE_OSPF6_LSDB, sizeof(struct ospf6_lsdb));
  45         memset(lsdb, 0, sizeof(struct ospf6_lsdb));
  46
  47         lsdb->data = data;
  48         lsdb->table = route_table_init();
  49         return lsdb;
  50 }
  51
  52 void ospf6_lsdb_delete(struct ospf6_lsdb *lsdb)
  53 {
  54         if (lsdb != NULL) {
  55                 ospf6_lsdb_remove_all(lsdb);
  56                 route_table_finish(lsdb->table);
  57                 XFREE(MTYPE_OSPF6_LSDB, lsdb);
  58         }
  59 }
  60
  61 static void ospf6_lsdb_set_key(struct prefix_ipv6 *key, const void *value,
  62                                int len)
  63 {
  64         assert(key->prefixlen % 8 == 0);
  65
  66         memcpy((caddr_t)&key->prefix + key->prefixlen / 8, (caddr_t)value, len);
  67         key->family = AF_INET6;
  68         key->prefixlen += len * 8;
  69 }
  70
  71 #ifdef DEBUG
  72 static void _lsdb_count_assert(struct ospf6_lsdb *lsdb)
  73 {
  74         struct ospf6_lsa *debug, *debugnext;
  75         unsigned int num = 0;
  76         for (ALL_LSDB(lsdb, debug, debugnext))
  77                 num++;
  78
  79         if (num == lsdb->count)
  80                 return;
  81
  82         zlog_debug("PANIC !! lsdb[%p]->count = %d, real = %d", lsdb,
  83                    lsdb->count, num);
  84         for (ALL_LSDB(lsdb, debug, debugnext))
  85                 zlog_debug("%s lsdb[%p]", debug->name, debug->lsdb);
  86         zlog_debug("DUMP END");
  87
  88         assert(num == lsdb->count);
  89 }
  90 #define ospf6_lsdb_count_assert(t) (_lsdb_count_assert (t))
  91 #else  /*DEBUG*/
  92 #define ospf6_lsdb_count_assert(t) ((void) 0)
  93 #endif /*DEBUG*/
  94
  95 void ospf6_lsdb_add(struct ospf6_lsa *lsa, struct ospf6_lsdb *lsdb)
  96 {
  97         struct prefix_ipv6 key;
  98         struct route_node *current;
  99         struct ospf6_lsa *old = NULL;
 100
 101         memset(&key, 0, sizeof(key));
 102         ospf6_lsdb_set_key(&key, &lsa->header->type, sizeof(lsa->header->type));
 103         ospf6_lsdb_set_key(&key, &lsa->header->adv_router,
 104                            sizeof(lsa->header->adv_router));
 105         ospf6_lsdb_set_key(&key, &lsa->header->id, sizeof(lsa->header->id));
 106
 107         current = route_node_get(lsdb->table, (struct prefix *)&key);
 108         old = current->info;
 109         current->info = lsa;
 110         lsa->rn = current;
 111         ospf6_lsa_lock(lsa);
 112
 113         if (!old) {
 114                 lsdb->count++;
 115
 116                 if (OSPF6_LSA_IS_MAXAGE(lsa)) {
 117                         if (lsdb->hook_remove)
 118                                 (*lsdb->hook_remove)(lsa);
 119                 } else {
 120                         if (lsdb->hook_add)
 121                                 (*lsdb->hook_add)(lsa);
 122                 }
 123         } else {
 124                 if (OSPF6_LSA_IS_CHANGED(old, lsa)) {
 125                         if (OSPF6_LSA_IS_MAXAGE(lsa)) {
 126                                 if (lsdb->hook_remove) {
 127                                         (*lsdb->hook_remove)(old);
 128                                         (*lsdb->hook_remove)(lsa);
 129                                 }
 130                         } else if (OSPF6_LSA_IS_MAXAGE(old)) {
 131                                 if (lsdb->hook_add)
 132                                         (*lsdb->hook_add)(lsa);
 133                         } else {
 134                                 if (lsdb->hook_remove)
 135                                         (*lsdb->hook_remove)(old);
 136                                 if (lsdb->hook_add)
 137                                         (*lsdb->hook_add)(lsa);
 138                         }
 139                 }
 140                 /* to free the lookup lock in node get*/
 141                 route_unlock_node(current);
 142                 ospf6_lsa_unlock(old);
 143         }
 144
 145         ospf6_lsdb_count_assert(lsdb);
 146 }
 147
 148 void ospf6_lsdb_remove(struct ospf6_lsa *lsa, struct ospf6_lsdb *lsdb)
 149 {
 150         struct route_node *node;
 151         struct prefix_ipv6 key;
 152
 153         memset(&key, 0, sizeof(key));
 154         ospf6_lsdb_set_key(&key, &lsa->header->type, sizeof(lsa->header->type));
 155         ospf6_lsdb_set_key(&key, &lsa->header->adv_router,
 156                            sizeof(lsa->header->adv_router));
 157         ospf6_lsdb_set_key(&key, &lsa->header->id, sizeof(lsa->header->id));
 158
 159         node = route_node_lookup(lsdb->table, (struct prefix *)&key);
 160         assert(node && node->info == lsa);
 161
 162         node->info = NULL;
 163         lsdb->count--;
 164
 165         if (lsdb->hook_remove)
 166                 (*lsdb->hook_remove)(lsa);
 167
 168         route_unlock_node(node); /* to free the lookup lock */
 169         route_unlock_node(node); /* to free the original lock */
 170         ospf6_lsa_unlock(lsa);
 171
 172         ospf6_lsdb_count_assert(lsdb);
 173 }
 174
 175 struct ospf6_lsa *ospf6_lsdb_lookup(uint16_t type, uint32_t id,
 176                                     uint32_t adv_router,
 177                                     struct ospf6_lsdb *lsdb)
 178 {
 179         struct route_node *node;
 180         struct prefix_ipv6 key;
 181
 182         if (lsdb == NULL)
 183                 return NULL;
 184
 185         memset(&key, 0, sizeof(key));
 186         ospf6_lsdb_set_key(&key, &type, sizeof(type));
 187         ospf6_lsdb_set_key(&key, &adv_router, sizeof(adv_router));
 188         ospf6_lsdb_set_key(&key, &id, sizeof(id));
 189
 190         node = route_node_lookup(lsdb->table, (struct prefix *)&key);
 191         if (node == NULL || node->info == NULL)
 192                 return NULL;
 193
 194         route_unlock_node(node);
 195         return (struct ospf6_lsa *)node->info;
 196 }
 197
 198 struct ospf6_lsa *ospf6_find_external_lsa(struct ospf6 *ospf6, struct prefix *p)
 199 {
 200         struct ospf6_route *match;
 201         struct ospf6_lsa *lsa;
 202         struct ospf6_external_info *info;
 203
 204         match = ospf6_route_lookup(p, ospf6->external_table);
 205         if (match == NULL) {
 206                 if (IS_OSPF6_DEBUG_ASBR)
 207                         zlog_debug("No such route %pFX to withdraw", p);
 208
 209                 return NULL;
 210         }
 211
 212         info = match->route_option;
 213         assert(info);
 214
 215         lsa = ospf6_lsdb_lookup(htons(OSPF6_LSTYPE_AS_EXTERNAL),
 216                                 htonl(info->id), ospf6->router_id, ospf6->lsdb);
 217         return lsa;
 218 }
 219
 220 struct ospf6_lsa *ospf6_lsdb_lookup_next(uint16_t type, uint32_t id,
 221                                          uint32_t adv_router,
 222                                          struct ospf6_lsdb *lsdb)
 223 {
 224         struct route_node *node;
 225         struct prefix_ipv6 key;
 226
 227         if (lsdb == NULL)
 228                 return NULL;
 229
 230         memset(&key, 0, sizeof(key));
 231         ospf6_lsdb_set_key(&key, &type, sizeof(type));
 232         ospf6_lsdb_set_key(&key, &adv_router, sizeof(adv_router));
 233         ospf6_lsdb_set_key(&key, &id, sizeof(id));
 234
 235         zlog_debug("lsdb_lookup_next: key: %pFX", &key);
 236
 237         node = route_table_get_next(lsdb->table, &key);
 238
 239         /* skip to real existing entry */
 240         while (node && node->info == NULL)
 241                 node = route_next(node);
 242
 243         if (!node)
 244                 return NULL;
 245
 246         route_unlock_node(node);
 247         if (!node->info)
 248                 return NULL;
 249
 250         return (struct ospf6_lsa *)node->info;
 251 }
 252
 253 const struct route_node *ospf6_lsdb_head(struct ospf6_lsdb *lsdb, int argmode,
 254                                          uint16_t type, uint32_t adv_router,
 255                                          struct ospf6_lsa **lsa)
 256 {
 257         struct route_node *node, *end;
 258
 259         *lsa = NULL;
 260
 261         if (argmode > 0) {
 262                 struct prefix_ipv6 key = {.family = AF_INET6, .prefixlen = 0};
 263
 264                 ospf6_lsdb_set_key(&key, &type, sizeof(type));
 265                 if (argmode > 1)
 266                         ospf6_lsdb_set_key(&key, &adv_router,
 267                                            sizeof(adv_router));
 268
 269                 node = route_table_get_next(lsdb->table, &key);
 270                 if (!node || !prefix_match((struct prefix *)&key, &node->p))
 271                         return NULL;
 272
 273                 for (end = node; end && end->parent
 274                                  && end->parent->p.prefixlen >= key.prefixlen;
 275                      end = end->parent)
 276                         ;
 277         } else {
 278                 node = route_top(lsdb->table);
 279                 end = NULL;
 280         }
 281
 282         while (node && !node->info)
 283                 node = route_next_until(node, end);
 284
 285         if (!node)
 286                 return NULL;
 287         if (!node->info) {
 288                 route_unlock_node(node);
 289                 return NULL;
 290         }
 291
 292         *lsa = node->info;
 293         ospf6_lsa_lock(*lsa);
 294
 295         return end;
 296 }
 297
 298 struct ospf6_lsa *ospf6_lsdb_next(const struct route_node *iterend,
 299                                   struct ospf6_lsa *lsa)
 300 {
 301         struct route_node *node = lsa->rn;
 302
 303         ospf6_lsa_unlock(lsa);
 304
 305         do
 306                 node = route_next_until(node, iterend);
 307         while (node && !node->info);
 308
 309         if (node && node->info) {
 310                 struct ospf6_lsa *next = node->info;
 311                 ospf6_lsa_lock(next);
 312                 return next;
 313         }
 314
 315         if (node)
 316                 route_unlock_node(node);
 317         return NULL;
 318 }
 319
 320 void ospf6_lsdb_remove_all(struct ospf6_lsdb *lsdb)
 321 {
 322         struct ospf6_lsa *lsa, *lsanext;
 323
 324         if (lsdb == NULL)
 325                 return;
 326
 327         for (ALL_LSDB(lsdb, lsa, lsanext))
 328                 ospf6_lsdb_remove(lsa, lsdb);
 329 }
 330
 331 void ospf6_lsdb_lsa_unlock(struct ospf6_lsa *lsa)
 332 {
 333         if (lsa != NULL) {
 334                 if (lsa->rn != NULL)
 335                         route_unlock_node(lsa->rn);
 336                 ospf6_lsa_unlock(lsa);
 337         }
 338 }
 339
 340 int ospf6_lsdb_maxage_remover(struct ospf6_lsdb *lsdb)
 341 {
 342         int reschedule = 0;
 343         struct ospf6_lsa *lsa, *lsanext;
 344
 345         for (ALL_LSDB(lsdb, lsa, lsanext)) {
 346                 if (!OSPF6_LSA_IS_MAXAGE(lsa)) {
 347                         if (IS_OSPF6_DEBUG_LSA_TYPE(lsa->header->type))
 348                                 zlog_debug("Not MaxAge %s", lsa->name);
 349                         continue;
 350                 }
 351
 352                 if (lsa->retrans_count != 0) {
 353                         if (IS_OSPF6_DEBUG_LSA_TYPE(lsa->header->type))
 354                                 zlog_debug("Remove MaxAge %s retrans_count %d",
 355                                            lsa->name, lsa->retrans_count);
 356
 357                         reschedule = 1;
 358                         continue;
 359                 }
 360                 if (IS_OSPF6_DEBUG_LSA_TYPE(lsa->header->type))
 361                         zlog_debug("Remove MaxAge %s", lsa->name);
 362
 363                 if (CHECK_FLAG(lsa->flag, OSPF6_LSA_SEQWRAPPED)) {
 364                         UNSET_FLAG(lsa->flag, OSPF6_LSA_SEQWRAPPED);
 365                         /*
 366                          * lsa->header->age = 0;
 367                          */
 368                         lsa->header->seqnum =
 369                                 htonl(OSPF_MAX_SEQUENCE_NUMBER + 1);
 370                         ospf6_lsa_checksum(lsa->header);
 371
 372                         THREAD_OFF(lsa->refresh);
 373                         thread_execute(master, ospf6_lsa_refresh, lsa, 0);
 374                 } else {
 375                         zlog_debug("calling ospf6_lsdb_remove %s", lsa->name);
 376                         ospf6_lsdb_remove(lsa, lsdb);
 377                 }
 378         }
 379
 380         return (reschedule);
 381 }
 382
 383 uint32_t ospf6_new_ls_id(uint16_t type, uint32_t adv_router,
 384                          struct ospf6_lsdb *lsdb)
 385 {
 386         struct ospf6_lsa *lsa;
 387         uint32_t id = 1, tmp_id;
 388
 389         /* This routine is curently invoked only for Inter-Prefix LSAs for
 390          * non-summarized routes (no area/range).
 391          */
 392         for (ALL_LSDB_TYPED_ADVRTR(lsdb, type, adv_router, lsa)) {
 393                 tmp_id = ntohl(lsa->header->id);
 394                 if (tmp_id < id)
 395                         continue;
 396
 397                 if (tmp_id > id) {
 398                         ospf6_lsdb_lsa_unlock(lsa);
 399                         break;
 400                 }
 401                 id++;
 402         }
 403
 404         return ((uint32_t)htonl(id));
 405 }
 406
 407 /* Decide new LS sequence number to originate.
 408    note return value is network byte order */
 409 uint32_t ospf6_new_ls_seqnum(uint16_t type, uint32_t id, uint32_t adv_router,
 410                              struct ospf6_lsdb *lsdb)
 411 {
 412         struct ospf6_lsa *lsa;
 413         signed long seqnum = 0;
 414
 415         /* if current database copy not found, return InitialSequenceNumber */
 416         lsa = ospf6_lsdb_lookup(type, id, adv_router, lsdb);
 417         if (lsa == NULL)
 418                 seqnum = OSPF_INITIAL_SEQUENCE_NUMBER;
 419         else
 420                 seqnum = (signed long)ntohl(lsa->header->seqnum) + 1;
 421
 422         return ((uint32_t)htonl(seqnum));
 423 }