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_route.h"
  34 #include "ospf6d.h"
  35 #include "bitfield.h"
  36
  37 struct ospf6_lsdb *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                 zlog_warn("Can't malloc lsdb");
  44                 return NULL;
  45         }
  46         memset(lsdb, 0, sizeof(struct ospf6_lsdb));
  47
  48         lsdb->data = data;
  49         lsdb->table = route_table_init();
  50         return lsdb;
  51 }
  52
  53 void ospf6_lsdb_delete(struct ospf6_lsdb *lsdb)
  54 {
  55         if (lsdb != NULL) {
  56                 ospf6_lsdb_remove_all(lsdb);
  57                 route_table_finish(lsdb->table);
  58                 XFREE(MTYPE_OSPF6_LSDB, lsdb);
  59         }
  60 }
  61
  62 static void ospf6_lsdb_set_key(struct prefix_ipv6 *key, const void *value,
  63                                int len)
  64 {
  65         assert(key->prefixlen % 8 == 0);
  66
  67         memcpy((caddr_t)&key->prefix + key->prefixlen / 8, (caddr_t)value, len);
  68         key->family = AF_INET6;
  69         key->prefixlen += len * 8;
  70 }
  71
  72 #ifdef DEBUG
  73 static void _lsdb_count_assert(struct ospf6_lsdb *lsdb)
  74 {
  75         struct ospf6_lsa *debug;
  76         unsigned int num = 0;
  77         for (ALL_LSDB(lsdb, debug))
  78                 num++;
  79
  80         if (num == lsdb->count)
  81                 return;
  82
  83         zlog_debug("PANIC !! lsdb[%p]->count = %d, real = %d", lsdb,
  84                    lsdb->count, num);
  85         for (ALL_LSDB(lsdb, debug))
  86                 zlog_debug("%s lsdb[%p]", debug->name, debug->lsdb);
  87         zlog_debug("DUMP END");
  88
  89         assert(num == lsdb->count);
  90 }
  91 #define ospf6_lsdb_count_assert(t) (_lsdb_count_assert (t))
  92 #else  /*DEBUG*/
  93 #define ospf6_lsdb_count_assert(t) ((void) 0)
  94 #endif /*DEBUG*/
  95
  96 void ospf6_lsdb_add(struct ospf6_lsa *lsa, struct ospf6_lsdb *lsdb)
  97 {
  98         struct prefix_ipv6 key;
  99         struct route_node *current;
 100         struct ospf6_lsa *old = NULL;
 101
 102         memset(&key, 0, sizeof(key));
 103         ospf6_lsdb_set_key(&key, &lsa->header->type, sizeof(lsa->header->type));
 104         ospf6_lsdb_set_key(&key, &lsa->header->adv_router,
 105                            sizeof(lsa->header->adv_router));
 106         ospf6_lsdb_set_key(&key, &lsa->header->id, sizeof(lsa->header->id));
 107
 108         current = route_node_get(lsdb->table, (struct prefix *)&key);
 109         old = current->info;
 110         current->info = lsa;
 111         lsa->rn = current;
 112         ospf6_lsa_lock(lsa);
 113
 114         if (!old) {
 115                 lsdb->count++;
 116
 117                 if (OSPF6_LSA_IS_MAXAGE(lsa)) {
 118                         if (lsdb->hook_remove)
 119                                 (*lsdb->hook_remove)(lsa);
 120                 } else {
 121                         if (lsdb->hook_add)
 122                                 (*lsdb->hook_add)(lsa);
 123                 }
 124         } else {
 125                 if (OSPF6_LSA_IS_CHANGED(old, lsa)) {
 126                         if (OSPF6_LSA_IS_MAXAGE(lsa)) {
 127                                 if (lsdb->hook_remove) {
 128                                         (*lsdb->hook_remove)(old);
 129                                         (*lsdb->hook_remove)(lsa);
 130                                 }
 131                         } else if (OSPF6_LSA_IS_MAXAGE(old)) {
 132                                 if (lsdb->hook_add)
 133                                         (*lsdb->hook_add)(lsa);
 134                         } else {
 135                                 if (lsdb->hook_remove)
 136                                         (*lsdb->hook_remove)(old);
 137                                 if (lsdb->hook_add)
 138                                         (*lsdb->hook_add)(lsa);
 139                         }
 140                 }
 141                 /* to free the lookup lock in node get*/
 142                 route_unlock_node(current);
 143                 ospf6_lsa_unlock(old);
 144         }
 145
 146         ospf6_lsdb_count_assert(lsdb);
 147 }
 148
 149 void ospf6_lsdb_remove(struct ospf6_lsa *lsa, struct ospf6_lsdb *lsdb)
 150 {
 151         struct route_node *node;
 152         struct prefix_ipv6 key;
 153
 154         memset(&key, 0, sizeof(key));
 155         ospf6_lsdb_set_key(&key, &lsa->header->type, sizeof(lsa->header->type));
 156         ospf6_lsdb_set_key(&key, &lsa->header->adv_router,
 157                            sizeof(lsa->header->adv_router));
 158         ospf6_lsdb_set_key(&key, &lsa->header->id, sizeof(lsa->header->id));
 159
 160         node = route_node_lookup(lsdb->table, (struct prefix *)&key);
 161         assert(node && node->info == lsa);
 162
 163         node->info = NULL;
 164         lsdb->count--;
 165
 166         if (lsdb->hook_remove)
 167                 (*lsdb->hook_remove)(lsa);
 168
 169         route_unlock_node(node); /* to free the lookup lock */
 170         route_unlock_node(node); /* to free the original lock */
 171         ospf6_lsa_unlock(lsa);
 172
 173         ospf6_lsdb_count_assert(lsdb);
 174 }
 175
 176 struct ospf6_lsa *ospf6_lsdb_lookup(uint16_t type, uint32_t id,
 177                                     uint32_t adv_router,
 178                                     struct ospf6_lsdb *lsdb)
 179 {
 180         struct route_node *node;
 181         struct prefix_ipv6 key;
 182
 183         if (lsdb == NULL)
 184                 return NULL;
 185
 186         memset(&key, 0, sizeof(key));
 187         ospf6_lsdb_set_key(&key, &type, sizeof(type));
 188         ospf6_lsdb_set_key(&key, &adv_router, sizeof(adv_router));
 189         ospf6_lsdb_set_key(&key, &id, sizeof(id));
 190
 191         node = route_node_lookup(lsdb->table, (struct prefix *)&key);
 192         if (node == NULL || node->info == NULL)
 193                 return NULL;
 194
 195         route_unlock_node(node);
 196         return (struct ospf6_lsa *)node->info;
 197 }
 198
 199 struct ospf6_lsa *ospf6_lsdb_lookup_next(uint16_t type, uint32_t id,
 200                                          uint32_t adv_router,
 201                                          struct ospf6_lsdb *lsdb)
 202 {
 203         struct route_node *node;
 204         struct prefix_ipv6 key;
 205
 206         if (lsdb == NULL)
 207                 return NULL;
 208
 209         memset(&key, 0, sizeof(key));
 210         ospf6_lsdb_set_key(&key, &type, sizeof(type));
 211         ospf6_lsdb_set_key(&key, &adv_router, sizeof(adv_router));
 212         ospf6_lsdb_set_key(&key, &id, sizeof(id));
 213
 214         {
 215                 char buf[PREFIX2STR_BUFFER];
 216                 prefix2str(&key, buf, sizeof(buf));
 217                 zlog_debug("lsdb_lookup_next: key: %s", buf);
 218         }
 219
 220         node = route_table_get_next(lsdb->table, &key);
 221
 222         /* skip to real existing entry */
 223         while (node && node->info == NULL)
 224                 node = route_next(node);
 225
 226         if (!node)
 227                 return NULL;
 228
 229         route_unlock_node(node);
 230         if (!node->info)
 231                 return NULL;
 232
 233         return (struct ospf6_lsa *)node->info;
 234 }
 235
 236 const struct route_node *ospf6_lsdb_head(struct ospf6_lsdb *lsdb, int argmode,
 237                                          uint16_t type, uint32_t adv_router,
 238                                          struct ospf6_lsa **lsa)
 239 {
 240         struct route_node *node, *end;
 241
 242         *lsa = NULL;
 243
 244         if (argmode > 0) {
 245                 struct prefix_ipv6 key = {.family = AF_INET6, .prefixlen = 0};
 246
 247                 ospf6_lsdb_set_key(&key, &type, sizeof(type));
 248                 if (argmode > 1)
 249                         ospf6_lsdb_set_key(&key, &adv_router,
 250                                            sizeof(adv_router));
 251
 252                 node = route_table_get_next(lsdb->table, &key);
 253                 if (!node || !prefix_match((struct prefix *)&key, &node->p))
 254                         return NULL;
 255
 256                 for (end = node; end && end->parent
 257                                  && end->parent->p.prefixlen >= key.prefixlen;
 258                      end = end->parent)
 259                         ;
 260         } else {
 261                 node = route_top(lsdb->table);
 262                 end = NULL;
 263         }
 264
 265         while (node && !node->info)
 266                 node = route_next_until(node, end);
 267
 268         if (!node)
 269                 return NULL;
 270         if (!node->info) {
 271                 route_unlock_node(node);
 272                 return NULL;
 273         }
 274
 275         *lsa = node->info;
 276         ospf6_lsa_lock(*lsa);
 277
 278         return end;
 279 }
 280
 281 struct ospf6_lsa *ospf6_lsdb_next(const struct route_node *iterend,
 282                                   struct ospf6_lsa *lsa)
 283 {
 284         struct route_node *node = lsa->rn;
 285
 286         ospf6_lsa_unlock(lsa);
 287
 288         do
 289                 node = route_next_until(node, iterend);
 290         while (node && !node->info);
 291
 292         if (node && node->info) {
 293                 struct ospf6_lsa *next = node->info;
 294                 ospf6_lsa_lock(next);
 295                 return next;
 296         }
 297
 298         if (node)
 299                 route_unlock_node(node);
 300         return NULL;
 301 }
 302
 303 void ospf6_lsdb_remove_all(struct ospf6_lsdb *lsdb)
 304 {
 305         struct ospf6_lsa *lsa;
 306
 307         if (lsdb == NULL)
 308                 return;
 309
 310         for (ALL_LSDB(lsdb, lsa))
 311                 ospf6_lsdb_remove(lsa, lsdb);
 312 }
 313
 314 void ospf6_lsdb_lsa_unlock(struct ospf6_lsa *lsa)
 315 {
 316         if (lsa != NULL) {
 317                 if (lsa->rn != NULL)
 318                         route_unlock_node(lsa->rn);
 319                 ospf6_lsa_unlock(lsa);
 320         }
 321 }
 322
 323 int ospf6_lsdb_maxage_remover(struct ospf6_lsdb *lsdb)
 324 {
 325         int reschedule = 0;
 326         struct ospf6_lsa *lsa;
 327
 328         for (ALL_LSDB(lsdb, lsa)) {
 329                 if (!OSPF6_LSA_IS_MAXAGE(lsa))
 330                         continue;
 331                 if (lsa->retrans_count != 0) {
 332                         reschedule = 1;
 333                         continue;
 334                 }
 335                 if (IS_OSPF6_DEBUG_LSA_TYPE(lsa->header->type))
 336                         zlog_debug("Remove MaxAge %s", lsa->name);
 337
 338                 if (CHECK_FLAG(lsa->flag, OSPF6_LSA_SEQWRAPPED)) {
 339                         UNSET_FLAG(lsa->flag, OSPF6_LSA_SEQWRAPPED);
 340                         /*
 341                          * lsa->header->age = 0;
 342                          */
 343                         lsa->header->seqnum =
 344                                 htonl(OSPF_MAX_SEQUENCE_NUMBER + 1);
 345                         ospf6_lsa_checksum(lsa->header);
 346
 347                         THREAD_OFF(lsa->refresh);
 348                         thread_execute(master, ospf6_lsa_refresh, lsa, 0);
 349                 } else {
 350                         ospf6_lsdb_remove(lsa, lsdb);
 351                 }
 352         }
 353
 354         return (reschedule);
 355 }
 356
 357 void ospf6_lsdb_show(struct vty *vty, enum ospf_lsdb_show_level level,
 358                      uint16_t *type, uint32_t *id, uint32_t *adv_router,
 359                      struct ospf6_lsdb *lsdb)
 360 {
 361         struct ospf6_lsa *lsa;
 362         const struct route_node *end = NULL;
 363         void (*showfunc)(struct vty *, struct ospf6_lsa *) = NULL;
 364
 365         switch (level) {
 366         case OSPF6_LSDB_SHOW_LEVEL_DETAIL:
 367                 showfunc = ospf6_lsa_show;
 368                 break;
 369         case OSPF6_LSDB_SHOW_LEVEL_INTERNAL:
 370                 showfunc = ospf6_lsa_show_internal;
 371                 break;
 372         case OSPF6_LSDB_SHOW_LEVEL_DUMP:
 373                 showfunc = ospf6_lsa_show_dump;
 374                 break;
 375         case OSPF6_LSDB_SHOW_LEVEL_NORMAL:
 376         default:
 377                 showfunc = ospf6_lsa_show_summary;
 378         }
 379
 380         if (type && id && adv_router) {
 381                 lsa = ospf6_lsdb_lookup(*type, *id, *adv_router, lsdb);
 382                 if (lsa) {
 383                         if (level == OSPF6_LSDB_SHOW_LEVEL_NORMAL)
 384                                 ospf6_lsa_show(vty, lsa);
 385                         else
 386                                 (*showfunc)(vty, lsa);
 387                 }
 388                 return;
 389         }
 390
 391         if (level == OSPF6_LSDB_SHOW_LEVEL_NORMAL)
 392                 ospf6_lsa_show_summary_header(vty);
 393
 394         end = ospf6_lsdb_head(lsdb, !!type + !!(type && adv_router),
 395                               type ? *type : 0, adv_router ? *adv_router : 0,
 396                               &lsa);
 397         while (lsa) {
 398                 if ((!adv_router || lsa->header->adv_router == *adv_router)
 399                     && (!id || lsa->header->id == *id))
 400                         (*showfunc)(vty, lsa);
 401
 402                 lsa = ospf6_lsdb_next(end, lsa);
 403         }
 404 }
 405
 406 uint32_t ospf6_new_ls_id(uint16_t type, uint32_t adv_router,
 407                          struct ospf6_lsdb *lsdb)
 408 {
 409         struct ospf6_lsa *lsa;
 410         uint32_t id = 1, tmp_id;
 411
 412         /* This routine is curently invoked only for Inter-Prefix LSAs for
 413          * non-summarized routes (no area/range).
 414          */
 415         for (ALL_LSDB_TYPED_ADVRTR(lsdb, type, adv_router, lsa)) {
 416                 tmp_id = ntohl(lsa->header->id);
 417                 if (tmp_id < id)
 418                         continue;
 419
 420                 if (tmp_id > id) {
 421                         ospf6_lsdb_lsa_unlock(lsa);
 422                         break;
 423                 }
 424                 id++;
 425         }
 426
 427         return ((uint32_t)htonl(id));
 428 }
 429
 430 /* Decide new LS sequence number to originate.
 431    note return value is network byte order */
 432 uint32_t ospf6_new_ls_seqnum(uint16_t type, uint32_t id, uint32_t adv_router,
 433                              struct ospf6_lsdb *lsdb)
 434 {
 435         struct ospf6_lsa *lsa;
 436         signed long seqnum = 0;
 437
 438         /* if current database copy not found, return InitialSequenceNumber */
 439         lsa = ospf6_lsdb_lookup(type, id, adv_router, lsdb);
 440         if (lsa == NULL)
 441                 seqnum = OSPF_INITIAL_SEQUENCE_NUMBER;
 442         else
 443                 seqnum = (signed long)ntohl(lsa->header->seqnum) + 1;
 444
 445         return ((uint32_t)htonl(seqnum));
 446 }