net/batman-adv/originator.c

   1 /* Copyright (C) 2009-2013 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #include "main.h"
  21 #include "distributed-arp-table.h"
  22 #include "originator.h"
  23 #include "hash.h"
  24 #include "translation-table.h"
  25 #include "routing.h"
  26 #include "gateway_client.h"
  27 #include "hard-interface.h"
  28 #include "soft-interface.h"
  29 #include "bridge_loop_avoidance.h"
  30 #include "network-coding.h"
  31
  32 /* hash class keys */
  33 static struct lock_class_key batadv_orig_hash_lock_class_key;
  34
  35 static void batadv_purge_orig(struct work_struct *work);
  36
  37 /* returns 1 if they are the same originator */
  38 static int batadv_compare_orig(const struct hlist_node *node, const void *data2)
  39 {
  40         const void *data1 = container_of(node, struct batadv_orig_node,
  41                                          hash_entry);
  42
  43         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
  44 }
  45
  46 int batadv_originator_init(struct batadv_priv *bat_priv)
  47 {
  48         if (bat_priv->orig_hash)
  49                 return 0;
  50
  51         bat_priv->orig_hash = batadv_hash_new(1024);
  52
  53         if (!bat_priv->orig_hash)
  54                 goto err;
  55
  56         batadv_hash_set_lock_class(bat_priv->orig_hash,
  57                                    &batadv_orig_hash_lock_class_key);
  58
  59         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
  60         queue_delayed_work(batadv_event_workqueue,
  61                            &bat_priv->orig_work,
  62                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
  63
  64         return 0;
  65
  66 err:
  67         return -ENOMEM;
  68 }
  69
  70 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
  71 {
  72         if (atomic_dec_and_test(&neigh_node->refcount))
  73                 kfree_rcu(neigh_node, rcu);
  74 }
  75
  76 /* increases the refcounter of a found router */
  77 struct batadv_neigh_node *
  78 batadv_orig_node_get_router(struct batadv_orig_node *orig_node)
  79 {
  80         struct batadv_neigh_node *router;
  81
  82         rcu_read_lock();
  83         router = rcu_dereference(orig_node->router);
  84
  85         if (router && !atomic_inc_not_zero(&router->refcount))
  86                 router = NULL;
  87
  88         rcu_read_unlock();
  89         return router;
  90 }
  91
  92 struct batadv_neigh_node *
  93 batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
  94                       const uint8_t *neigh_addr)
  95 {
  96         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
  97         struct batadv_neigh_node *neigh_node;
  98
  99         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 100         if (!neigh_node)
 101                 goto out;
 102
 103         INIT_HLIST_NODE(&neigh_node->list);
 104
 105         memcpy(neigh_node->addr, neigh_addr, ETH_ALEN);
 106         spin_lock_init(&neigh_node->lq_update_lock);
 107
 108         /* extra reference for return */
 109         atomic_set(&neigh_node->refcount, 2);
 110
 111         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 112                    "Creating new neighbor %pM on interface %s\n", neigh_addr,
 113                    hard_iface->net_dev->name);
 114
 115 out:
 116         return neigh_node;
 117 }
 118
 119 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 120 {
 121         struct hlist_node *node_tmp;
 122         struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
 123         struct batadv_orig_node *orig_node;
 124
 125         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 126
 127         spin_lock_bh(&orig_node->neigh_list_lock);
 128
 129         /* for all bonding members ... */
 130         list_for_each_entry_safe(neigh_node, tmp_neigh_node,
 131                                  &orig_node->bond_list, bonding_list) {
 132                 list_del_rcu(&neigh_node->bonding_list);
 133                 batadv_neigh_node_free_ref(neigh_node);
 134         }
 135
 136         /* for all neighbors towards this originator ... */
 137         hlist_for_each_entry_safe(neigh_node, node_tmp,
 138                                   &orig_node->neigh_list, list) {
 139                 hlist_del_rcu(&neigh_node->list);
 140                 batadv_neigh_node_free_ref(neigh_node);
 141         }
 142
 143         spin_unlock_bh(&orig_node->neigh_list_lock);
 144
 145         /* Free nc_nodes */
 146         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 147
 148         batadv_tt_global_del_orig(orig_node->bat_priv, orig_node,
 149                                   "originator timed out");
 150
 151         kfree(orig_node->tt_buff);
 152         kfree(orig_node->bcast_own);
 153         kfree(orig_node->bcast_own_sum);
 154         kfree(orig_node);
 155 }
 156
 157 /**
 158  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 159  * schedule an rcu callback for freeing it
 160  * @orig_node: the orig node to free
 161  */
 162 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 163 {
 164         if (atomic_dec_and_test(&orig_node->refcount))
 165                 call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 166 }
 167
 168 /**
 169  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 170  * possibly free it (without rcu callback)
 171  * @orig_node: the orig node to free
 172  */
 173 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 174 {
 175         if (atomic_dec_and_test(&orig_node->refcount))
 176                 batadv_orig_node_free_rcu(&orig_node->rcu);
 177 }
 178
 179 void batadv_originator_free(struct batadv_priv *bat_priv)
 180 {
 181         struct batadv_hashtable *hash = bat_priv->orig_hash;
 182         struct hlist_node *node_tmp;
 183         struct hlist_head *head;
 184         spinlock_t *list_lock; /* spinlock to protect write access */
 185         struct batadv_orig_node *orig_node;
 186         uint32_t i;
 187
 188         if (!hash)
 189                 return;
 190
 191         cancel_delayed_work_sync(&bat_priv->orig_work);
 192
 193         bat_priv->orig_hash = NULL;
 194
 195         for (i = 0; i < hash->size; i++) {
 196                 head = &hash->table[i];
 197                 list_lock = &hash->list_locks[i];
 198
 199                 spin_lock_bh(list_lock);
 200                 hlist_for_each_entry_safe(orig_node, node_tmp,
 201                                           head, hash_entry) {
 202                         hlist_del_rcu(&orig_node->hash_entry);
 203                         batadv_orig_node_free_ref(orig_node);
 204                 }
 205                 spin_unlock_bh(list_lock);
 206         }
 207
 208         batadv_hash_destroy(hash);
 209 }
 210
 211 /* this function finds or creates an originator entry for the given
 212  * address if it does not exits
 213  */
 214 struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 215                                               const uint8_t *addr)
 216 {
 217         struct batadv_orig_node *orig_node;
 218         int size;
 219         int hash_added;
 220         unsigned long reset_time;
 221
 222         orig_node = batadv_orig_hash_find(bat_priv, addr);
 223         if (orig_node)
 224                 return orig_node;
 225
 226         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 227                    "Creating new originator: %pM\n", addr);
 228
 229         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 230         if (!orig_node)
 231                 return NULL;
 232
 233         INIT_HLIST_HEAD(&orig_node->neigh_list);
 234         INIT_LIST_HEAD(&orig_node->bond_list);
 235         spin_lock_init(&orig_node->ogm_cnt_lock);
 236         spin_lock_init(&orig_node->bcast_seqno_lock);
 237         spin_lock_init(&orig_node->neigh_list_lock);
 238         spin_lock_init(&orig_node->tt_buff_lock);
 239
 240         batadv_nc_init_orig(orig_node);
 241
 242         /* extra reference for return */
 243         atomic_set(&orig_node->refcount, 2);
 244
 245         orig_node->tt_initialised = false;
 246         orig_node->bat_priv = bat_priv;
 247         memcpy(orig_node->orig, addr, ETH_ALEN);
 248         batadv_dat_init_orig_node_addr(orig_node);
 249         orig_node->router = NULL;
 250         orig_node->tt_crc = 0;
 251         atomic_set(&orig_node->last_ttvn, 0);
 252         orig_node->tt_buff = NULL;
 253         orig_node->tt_buff_len = 0;
 254         atomic_set(&orig_node->tt_size, 0);
 255         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 256         orig_node->bcast_seqno_reset = reset_time;
 257         orig_node->batman_seqno_reset = reset_time;
 258
 259         atomic_set(&orig_node->bond_candidates, 0);
 260
 261         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 262
 263         orig_node->bcast_own = kzalloc(size, GFP_ATOMIC);
 264         if (!orig_node->bcast_own)
 265                 goto free_orig_node;
 266
 267         size = bat_priv->num_ifaces * sizeof(uint8_t);
 268         orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 269
 270         if (!orig_node->bcast_own_sum)
 271                 goto free_bcast_own;
 272
 273         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 274                                      batadv_choose_orig, orig_node,
 275                                      &orig_node->hash_entry);
 276         if (hash_added != 0)
 277                 goto free_bcast_own_sum;
 278
 279         return orig_node;
 280 free_bcast_own_sum:
 281         kfree(orig_node->bcast_own_sum);
 282 free_bcast_own:
 283         kfree(orig_node->bcast_own);
 284 free_orig_node:
 285         kfree(orig_node);
 286         return NULL;
 287 }
 288
 289 static bool
 290 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 291                             struct batadv_orig_node *orig_node,
 292                             struct batadv_neigh_node **best_neigh_node)
 293 {
 294         struct hlist_node *node_tmp;
 295         struct batadv_neigh_node *neigh_node;
 296         bool neigh_purged = false;
 297         unsigned long last_seen;
 298         struct batadv_hard_iface *if_incoming;
 299
 300         *best_neigh_node = NULL;
 301
 302         spin_lock_bh(&orig_node->neigh_list_lock);
 303
 304         /* for all neighbors towards this originator ... */
 305         hlist_for_each_entry_safe(neigh_node, node_tmp,
 306                                   &orig_node->neigh_list, list) {
 307                 last_seen = neigh_node->last_seen;
 308                 if_incoming = neigh_node->if_incoming;
 309
 310                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 311                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 312                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 313                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 314                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 315                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 316                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 317                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 318                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 319                                            orig_node->orig, neigh_node->addr,
 320                                            if_incoming->net_dev->name);
 321                         else
 322                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 323                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 324                                            orig_node->orig, neigh_node->addr,
 325                                            jiffies_to_msecs(last_seen));
 326
 327                         neigh_purged = true;
 328
 329                         hlist_del_rcu(&neigh_node->list);
 330                         batadv_bonding_candidate_del(orig_node, neigh_node);
 331                         batadv_neigh_node_free_ref(neigh_node);
 332                 } else {
 333                         if ((!*best_neigh_node) ||
 334                             (neigh_node->tq_avg > (*best_neigh_node)->tq_avg))
 335                                 *best_neigh_node = neigh_node;
 336                 }
 337         }
 338
 339         spin_unlock_bh(&orig_node->neigh_list_lock);
 340         return neigh_purged;
 341 }
 342
 343 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 344                                    struct batadv_orig_node *orig_node)
 345 {
 346         struct batadv_neigh_node *best_neigh_node;
 347
 348         if (batadv_has_timed_out(orig_node->last_seen,
 349                                  2 * BATADV_PURGE_TIMEOUT)) {
 350                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 351                            "Originator timeout: originator %pM, last_seen %u\n",
 352                            orig_node->orig,
 353                            jiffies_to_msecs(orig_node->last_seen));
 354                 return true;
 355         } else {
 356                 if (batadv_purge_orig_neighbors(bat_priv, orig_node,
 357                                                 &best_neigh_node))
 358                         batadv_update_route(bat_priv, orig_node,
 359                                             best_neigh_node);
 360         }
 361
 362         return false;
 363 }
 364
 365 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 366 {
 367         struct batadv_hashtable *hash = bat_priv->orig_hash;
 368         struct hlist_node *node_tmp;
 369         struct hlist_head *head;
 370         spinlock_t *list_lock; /* spinlock to protect write access */
 371         struct batadv_orig_node *orig_node;
 372         uint32_t i;
 373
 374         if (!hash)
 375                 return;
 376
 377         /* for all origins... */
 378         for (i = 0; i < hash->size; i++) {
 379                 head = &hash->table[i];
 380                 list_lock = &hash->list_locks[i];
 381
 382                 spin_lock_bh(list_lock);
 383                 hlist_for_each_entry_safe(orig_node, node_tmp,
 384                                           head, hash_entry) {
 385                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
 386                                 batadv_gw_node_delete(bat_priv, orig_node);
 387                                 hlist_del_rcu(&orig_node->hash_entry);
 388                                 batadv_orig_node_free_ref(orig_node);
 389                                 continue;
 390                         }
 391                 }
 392                 spin_unlock_bh(list_lock);
 393         }
 394
 395         batadv_gw_node_purge(bat_priv);
 396         batadv_gw_election(bat_priv);
 397 }
 398
 399 static void batadv_purge_orig(struct work_struct *work)
 400 {
 401         struct delayed_work *delayed_work;
 402         struct batadv_priv *bat_priv;
 403
 404         delayed_work = container_of(work, struct delayed_work, work);
 405         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
 406         _batadv_purge_orig(bat_priv);
 407         queue_delayed_work(batadv_event_workqueue,
 408                            &bat_priv->orig_work,
 409                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 410 }
 411
 412 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
 413 {
 414         _batadv_purge_orig(bat_priv);
 415 }
 416
 417 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
 418 {
 419         struct net_device *net_dev = (struct net_device *)seq->private;
 420         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 421         struct batadv_hashtable *hash = bat_priv->orig_hash;
 422         struct hlist_head *head;
 423         struct batadv_hard_iface *primary_if;
 424         struct batadv_orig_node *orig_node;
 425         struct batadv_neigh_node *neigh_node, *neigh_node_tmp;
 426         int batman_count = 0;
 427         int last_seen_secs;
 428         int last_seen_msecs;
 429         unsigned long last_seen_jiffies;
 430         uint32_t i;
 431
 432         primary_if = batadv_seq_print_text_primary_if_get(seq);
 433         if (!primary_if)
 434                 goto out;
 435
 436         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n",
 437                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 438                    primary_if->net_dev->dev_addr, net_dev->name);
 439         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
 440                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
 441                    "Nexthop", "outgoingIF", "Potential nexthops");
 442
 443         for (i = 0; i < hash->size; i++) {
 444                 head = &hash->table[i];
 445
 446                 rcu_read_lock();
 447                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 448                         neigh_node = batadv_orig_node_get_router(orig_node);
 449                         if (!neigh_node)
 450                                 continue;
 451
 452                         if (neigh_node->tq_avg == 0)
 453                                 goto next;
 454
 455                         last_seen_jiffies = jiffies - orig_node->last_seen;
 456                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 457                         last_seen_secs = last_seen_msecs / 1000;
 458                         last_seen_msecs = last_seen_msecs % 1000;
 459
 460                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
 461                                    orig_node->orig, last_seen_secs,
 462                                    last_seen_msecs, neigh_node->tq_avg,
 463                                    neigh_node->addr,
 464                                    neigh_node->if_incoming->net_dev->name);
 465
 466                         hlist_for_each_entry_rcu(neigh_node_tmp,
 467                                                  &orig_node->neigh_list, list) {
 468                                 seq_printf(seq, " %pM (%3i)",
 469                                            neigh_node_tmp->addr,
 470                                            neigh_node_tmp->tq_avg);
 471                         }
 472
 473                         seq_puts(seq, "\n");
 474                         batman_count++;
 475
 476 next:
 477                         batadv_neigh_node_free_ref(neigh_node);
 478                 }
 479                 rcu_read_unlock();
 480         }
 481
 482         if (batman_count == 0)
 483                 seq_puts(seq, "No batman nodes in range ...\n");
 484
 485 out:
 486         if (primary_if)
 487                 batadv_hardif_free_ref(primary_if);
 488         return 0;
 489 }
 490
 491 static int batadv_orig_node_add_if(struct batadv_orig_node *orig_node,
 492                                    int max_if_num)
 493 {
 494         void *data_ptr;
 495         size_t data_size, old_size;
 496
 497         data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS;
 498         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 499         data_ptr = kmalloc(data_size, GFP_ATOMIC);
 500         if (!data_ptr)
 501                 return -ENOMEM;
 502
 503         memcpy(data_ptr, orig_node->bcast_own, old_size);
 504         kfree(orig_node->bcast_own);
 505         orig_node->bcast_own = data_ptr;
 506
 507         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 508         if (!data_ptr)
 509                 return -ENOMEM;
 510
 511         memcpy(data_ptr, orig_node->bcast_own_sum,
 512                (max_if_num - 1) * sizeof(uint8_t));
 513         kfree(orig_node->bcast_own_sum);
 514         orig_node->bcast_own_sum = data_ptr;
 515
 516         return 0;
 517 }
 518
 519 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
 520                             int max_if_num)
 521 {
 522         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 523         struct batadv_hashtable *hash = bat_priv->orig_hash;
 524         struct hlist_head *head;
 525         struct batadv_orig_node *orig_node;
 526         uint32_t i;
 527         int ret;
 528
 529         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 530          * if_num
 531          */
 532         for (i = 0; i < hash->size; i++) {
 533                 head = &hash->table[i];
 534
 535                 rcu_read_lock();
 536                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 537                         spin_lock_bh(&orig_node->ogm_cnt_lock);
 538                         ret = batadv_orig_node_add_if(orig_node, max_if_num);
 539                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 540
 541                         if (ret == -ENOMEM)
 542                                 goto err;
 543                 }
 544                 rcu_read_unlock();
 545         }
 546
 547         return 0;
 548
 549 err:
 550         rcu_read_unlock();
 551         return -ENOMEM;
 552 }
 553
 554 static int batadv_orig_node_del_if(struct batadv_orig_node *orig_node,
 555                                    int max_if_num, int del_if_num)
 556 {
 557         void *data_ptr = NULL;
 558         int chunk_size;
 559
 560         /* last interface was removed */
 561         if (max_if_num == 0)
 562                 goto free_bcast_own;
 563
 564         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 565         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 566         if (!data_ptr)
 567                 return -ENOMEM;
 568
 569         /* copy first part */
 570         memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
 571
 572         /* copy second part */
 573         memcpy((char *)data_ptr + del_if_num * chunk_size,
 574                orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
 575                (max_if_num - del_if_num) * chunk_size);
 576
 577 free_bcast_own:
 578         kfree(orig_node->bcast_own);
 579         orig_node->bcast_own = data_ptr;
 580
 581         if (max_if_num == 0)
 582                 goto free_own_sum;
 583
 584         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 585         if (!data_ptr)
 586                 return -ENOMEM;
 587
 588         memcpy(data_ptr, orig_node->bcast_own_sum,
 589                del_if_num * sizeof(uint8_t));
 590
 591         memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
 592                orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
 593                (max_if_num - del_if_num) * sizeof(uint8_t));
 594
 595 free_own_sum:
 596         kfree(orig_node->bcast_own_sum);
 597         orig_node->bcast_own_sum = data_ptr;
 598
 599         return 0;
 600 }
 601
 602 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
 603                             int max_if_num)
 604 {
 605         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 606         struct batadv_hashtable *hash = bat_priv->orig_hash;
 607         struct hlist_head *head;
 608         struct batadv_hard_iface *hard_iface_tmp;
 609         struct batadv_orig_node *orig_node;
 610         uint32_t i;
 611         int ret;
 612
 613         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 614          * if_num
 615          */
 616         for (i = 0; i < hash->size; i++) {
 617                 head = &hash->table[i];
 618
 619                 rcu_read_lock();
 620                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 621                         spin_lock_bh(&orig_node->ogm_cnt_lock);
 622                         ret = batadv_orig_node_del_if(orig_node, max_if_num,
 623                                                       hard_iface->if_num);
 624                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 625
 626                         if (ret == -ENOMEM)
 627                                 goto err;
 628                 }
 629                 rcu_read_unlock();
 630         }
 631
 632         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
 633         rcu_read_lock();
 634         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
 635                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
 636                         continue;
 637
 638                 if (hard_iface == hard_iface_tmp)
 639                         continue;
 640
 641                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
 642                         continue;
 643
 644                 if (hard_iface_tmp->if_num > hard_iface->if_num)
 645                         hard_iface_tmp->if_num--;
 646         }
 647         rcu_read_unlock();
 648
 649         hard_iface->if_num = -1;
 650         return 0;
 651
 652 err:
 653         rcu_read_unlock();
 654         return -ENOMEM;
 655 }