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 static inline void ospf6_lsdb_stats_update(struct ospf6_lsa *lsa,
  96                                            struct ospf6_lsdb *lsdb, int count)
  97 {
  98         uint16_t stat = ntohs(lsa->header->type) & OSPF6_LSTYPE_FCODE_MASK;
  99
 100         if (stat >= OSPF6_LSTYPE_SIZE)
 101                 stat = OSPF6_LSTYPE_UNKNOWN;
 102         lsdb->stats[stat] += count;
 103 }
 104
 105 void ospf6_lsdb_add(struct ospf6_lsa *lsa, struct ospf6_lsdb *lsdb)
 106 {
 107         struct prefix_ipv6 key;
 108         struct route_node *current;
 109         struct ospf6_lsa *old = NULL;
 110
 111         memset(&key, 0, sizeof(key));
 112         ospf6_lsdb_set_key(&key, &lsa->header->type, sizeof(lsa->header->type));
 113         ospf6_lsdb_set_key(&key, &lsa->header->adv_router,
 114                            sizeof(lsa->header->adv_router));
 115         ospf6_lsdb_set_key(&key, &lsa->header->id, sizeof(lsa->header->id));
 116
 117         current = route_node_get(lsdb->table, (struct prefix *)&key);
 118         old = current->info;
 119         current->info = lsa;
 120         lsa->rn = current;
 121         ospf6_lsa_lock(lsa);
 122
 123         if (!old) {
 124                 lsdb->count++;
 125                 ospf6_lsdb_stats_update(lsa, lsdb, 1);
 126
 127                 if (OSPF6_LSA_IS_MAXAGE(lsa)) {
 128                         if (lsdb->hook_remove)
 129                                 (*lsdb->hook_remove)(lsa);
 130                 } else {
 131                         if (lsdb->hook_add)
 132                                 (*lsdb->hook_add)(lsa);
 133                 }
 134         } else {
 135                 if (OSPF6_LSA_IS_CHANGED(old, lsa)) {
 136                         if (OSPF6_LSA_IS_MAXAGE(lsa)) {
 137                                 if (lsdb->hook_remove) {
 138                                         (*lsdb->hook_remove)(old);
 139                                         (*lsdb->hook_remove)(lsa);
 140                                 }
 141                         } else if (OSPF6_LSA_IS_MAXAGE(old)) {
 142                                 if (lsdb->hook_add)
 143                                         (*lsdb->hook_add)(lsa);
 144                         } else {
 145                                 if (lsdb->hook_remove)
 146                                         (*lsdb->hook_remove)(old);
 147                                 if (lsdb->hook_add)
 148                                         (*lsdb->hook_add)(lsa);
 149                         }
 150                 }
 151                 /* to free the lookup lock in node get*/
 152                 route_unlock_node(current);
 153                 ospf6_lsa_unlock(old);
 154         }
 155
 156         ospf6_lsdb_count_assert(lsdb);
 157 }
 158
 159 void ospf6_lsdb_remove(struct ospf6_lsa *lsa, struct ospf6_lsdb *lsdb)
 160 {
 161         struct route_node *node;
 162         struct prefix_ipv6 key;
 163
 164         memset(&key, 0, sizeof(key));
 165         ospf6_lsdb_set_key(&key, &lsa->header->type, sizeof(lsa->header->type));
 166         ospf6_lsdb_set_key(&key, &lsa->header->adv_router,
 167                            sizeof(lsa->header->adv_router));
 168         ospf6_lsdb_set_key(&key, &lsa->header->id, sizeof(lsa->header->id));
 169
 170         node = route_node_lookup(lsdb->table, (struct prefix *)&key);
 171         assert(node && node->info == lsa);
 172
 173         node->info = NULL;
 174         lsdb->count--;
 175         ospf6_lsdb_stats_update(lsa, lsdb, -1);
 176
 177         if (lsdb->hook_remove)
 178                 (*lsdb->hook_remove)(lsa);
 179
 180         route_unlock_node(node); /* to free the lookup lock */
 181         route_unlock_node(node); /* to free the original lock */
 182         ospf6_lsa_unlock(lsa);
 183
 184         ospf6_lsdb_count_assert(lsdb);
 185 }
 186
 187 struct ospf6_lsa *ospf6_lsdb_lookup(uint16_t type, uint32_t id,
 188                                     uint32_t adv_router,
 189                                     struct ospf6_lsdb *lsdb)
 190 {
 191         struct route_node *node;
 192         struct prefix_ipv6 key;
 193
 194         if (lsdb == NULL)
 195                 return NULL;
 196
 197         memset(&key, 0, sizeof(key));
 198         ospf6_lsdb_set_key(&key, &type, sizeof(type));
 199         ospf6_lsdb_set_key(&key, &adv_router, sizeof(adv_router));
 200         ospf6_lsdb_set_key(&key, &id, sizeof(id));
 201
 202         node = route_node_lookup(lsdb->table, (struct prefix *)&key);
 203         if (node == NULL || node->info == NULL)
 204                 return NULL;
 205
 206         route_unlock_node(node);
 207         return (struct ospf6_lsa *)node->info;
 208 }
 209
 210 struct ospf6_lsa *ospf6_find_external_lsa(struct ospf6 *ospf6, struct prefix *p)
 211 {
 212         struct ospf6_route *match;
 213         struct ospf6_lsa *lsa;
 214         struct ospf6_external_info *info;
 215
 216         match = ospf6_route_lookup(p, ospf6->external_table);
 217         if (match == NULL) {
 218                 if (IS_OSPF6_DEBUG_ASBR)
 219                         zlog_debug("No such route %pFX to withdraw", p);
 220
 221                 return NULL;
 222         }
 223
 224         info = match->route_option;
 225         assert(info);
 226
 227         lsa = ospf6_lsdb_lookup(htons(OSPF6_LSTYPE_AS_EXTERNAL),
 228                                 htonl(info->id), ospf6->router_id, ospf6->lsdb);
 229         return lsa;
 230 }
 231
 232 struct ospf6_lsa *ospf6_lsdb_lookup_next(uint16_t type, uint32_t id,
 233                                          uint32_t adv_router,
 234                                          struct ospf6_lsdb *lsdb)
 235 {
 236         struct route_node *node;
 237         struct prefix_ipv6 key;
 238
 239         if (lsdb == NULL)
 240                 return NULL;
 241
 242         memset(&key, 0, sizeof(key));
 243         ospf6_lsdb_set_key(&key, &type, sizeof(type));
 244         ospf6_lsdb_set_key(&key, &adv_router, sizeof(adv_router));
 245         ospf6_lsdb_set_key(&key, &id, sizeof(id));
 246
 247         zlog_debug("lsdb_lookup_next: key: %pFX", &key);
 248
 249         node = route_table_get_next(lsdb->table, &key);
 250
 251         /* skip to real existing entry */
 252         while (node && node->info == NULL)
 253                 node = route_next(node);
 254
 255         if (!node)
 256                 return NULL;
 257
 258         route_unlock_node(node);
 259         if (!node->info)
 260                 return NULL;
 261
 262         return (struct ospf6_lsa *)node->info;
 263 }
 264
 265 const struct route_node *ospf6_lsdb_head(struct ospf6_lsdb *lsdb, int argmode,
 266                                          uint16_t type, uint32_t adv_router,
 267                                          struct ospf6_lsa **lsa)
 268 {
 269         struct route_node *node, *end;
 270
 271         *lsa = NULL;
 272
 273         if (argmode > 0) {
 274                 struct prefix_ipv6 key = {.family = AF_INET6, .prefixlen = 0};
 275
 276                 ospf6_lsdb_set_key(&key, &type, sizeof(type));
 277                 if (argmode > 1)
 278                         ospf6_lsdb_set_key(&key, &adv_router,
 279                                            sizeof(adv_router));
 280
 281                 node = route_table_get_next(lsdb->table, &key);
 282                 if (!node || !prefix_match((struct prefix *)&key, &node->p))
 283                         return NULL;
 284
 285                 for (end = node; end && end->parent
 286                                  && end->parent->p.prefixlen >= key.prefixlen;
 287                      end = end->parent)
 288                         ;
 289         } else {
 290                 node = route_top(lsdb->table);
 291                 end = NULL;
 292         }
 293
 294         while (node && !node->info)
 295                 node = route_next_until(node, end);
 296
 297         if (!node)
 298                 return NULL;
 299         if (!node->info) {
 300                 route_unlock_node(node);
 301                 return NULL;
 302         }
 303
 304         *lsa = node->info;
 305         ospf6_lsa_lock(*lsa);
 306
 307         return end;
 308 }
 309
 310 struct ospf6_lsa *ospf6_lsdb_next(const struct route_node *iterend,
 311                                   struct ospf6_lsa *lsa)
 312 {
 313         struct route_node *node = lsa->rn;
 314
 315         ospf6_lsa_unlock(lsa);
 316
 317         do
 318                 node = route_next_until(node, iterend);
 319         while (node && !node->info);
 320
 321         if (node && node->info) {
 322                 struct ospf6_lsa *next = node->info;
 323                 ospf6_lsa_lock(next);
 324                 return next;
 325         }
 326
 327         if (node)
 328                 route_unlock_node(node);
 329         return NULL;
 330 }
 331
 332 void ospf6_lsdb_remove_all(struct ospf6_lsdb *lsdb)
 333 {
 334         struct ospf6_lsa *lsa, *lsanext;
 335
 336         if (lsdb == NULL)
 337                 return;
 338
 339         for (ALL_LSDB(lsdb, lsa, lsanext))
 340                 ospf6_lsdb_remove(lsa, lsdb);
 341 }
 342
 343 void ospf6_lsdb_lsa_unlock(struct ospf6_lsa *lsa)
 344 {
 345         if (lsa != NULL) {
 346                 if (lsa->rn != NULL)
 347                         route_unlock_node(lsa->rn);
 348                 ospf6_lsa_unlock(lsa);
 349         }
 350 }
 351
 352 int ospf6_lsdb_maxage_remover(struct ospf6_lsdb *lsdb)
 353 {
 354         int reschedule = 0;
 355         struct ospf6_lsa *lsa, *lsanext;
 356
 357         for (ALL_LSDB(lsdb, lsa, lsanext)) {
 358                 if (!OSPF6_LSA_IS_MAXAGE(lsa)) {
 359                         if (IS_OSPF6_DEBUG_LSA_TYPE(lsa->header->type))
 360                                 zlog_debug("Not MaxAge %s", lsa->name);
 361                         continue;
 362                 }
 363
 364                 if (lsa->retrans_count != 0) {
 365                         if (IS_OSPF6_DEBUG_LSA_TYPE(lsa->header->type))
 366                                 zlog_debug("Remove MaxAge %s retrans_count %d",
 367                                            lsa->name, lsa->retrans_count);
 368
 369                         reschedule = 1;
 370                         continue;
 371                 }
 372                 if (IS_OSPF6_DEBUG_LSA_TYPE(lsa->header->type))
 373                         zlog_debug("Remove MaxAge %s", lsa->name);
 374
 375                 if (CHECK_FLAG(lsa->flag, OSPF6_LSA_SEQWRAPPED)) {
 376                         UNSET_FLAG(lsa->flag, OSPF6_LSA_SEQWRAPPED);
 377                         /*
 378                          * lsa->header->age = 0;
 379                          */
 380                         lsa->header->seqnum =
 381                                 htonl(OSPF_MAX_SEQUENCE_NUMBER + 1);
 382                         ospf6_lsa_checksum(lsa->header);
 383
 384                         THREAD_OFF(lsa->refresh);
 385                         thread_execute(master, ospf6_lsa_refresh, lsa, 0);
 386                 } else {
 387                         zlog_debug("calling ospf6_lsdb_remove %s", lsa->name);
 388                         ospf6_lsdb_remove(lsa, lsdb);
 389                 }
 390         }
 391
 392         return (reschedule);
 393 }
 394
 395 uint32_t ospf6_new_ls_id(uint16_t type, uint32_t adv_router,
 396                          struct ospf6_lsdb *lsdb)
 397 {
 398         struct ospf6_lsa *lsa;
 399         uint32_t id = 1, tmp_id;
 400
 401         /* This routine is curently invoked only for Inter-Prefix LSAs for
 402          * non-summarized routes (no area/range).
 403          */
 404         for (ALL_LSDB_TYPED_ADVRTR(lsdb, type, adv_router, lsa)) {
 405                 tmp_id = ntohl(lsa->header->id);
 406                 if (tmp_id < id)
 407                         continue;
 408
 409                 if (tmp_id > id) {
 410                         ospf6_lsdb_lsa_unlock(lsa);
 411                         break;
 412                 }
 413                 id++;
 414         }
 415
 416         return ((uint32_t)htonl(id));
 417 }
 418
 419 /* Decide new LS sequence number to originate.
 420    note return value is network byte order */
 421 uint32_t ospf6_new_ls_seqnum(uint16_t type, uint32_t id, uint32_t adv_router,
 422                              struct ospf6_lsdb *lsdb)
 423 {
 424         struct ospf6_lsa *lsa;
 425         signed long seqnum = 0;
 426
 427         /* if current database copy not found, return InitialSequenceNumber */
 428         lsa = ospf6_lsdb_lookup(type, id, adv_router, lsdb);
 429         if (lsa == NULL)
 430                 seqnum = OSPF_INITIAL_SEQUENCE_NUMBER;
 431         else
 432                 seqnum = (signed long)ntohl(lsa->header->seqnum) + 1;
 433
 434         return ((uint32_t)htonl(seqnum));
 435 }