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 "unicast.h"
  29 #include "soft-interface.h"
  30 #include "bridge_loop_avoidance.h"
  31 #include "network-coding.h"
  32
  33 /* hash class keys */
  34 static struct lock_class_key batadv_orig_hash_lock_class_key;
  35
  36 static void batadv_purge_orig(struct work_struct *work);
  37
  38 /* returns 1 if they are the same originator */
  39 static int batadv_compare_orig(const struct hlist_node *node, const void *data2)
  40 {
  41         const void *data1 = container_of(node, struct batadv_orig_node,
  42                                          hash_entry);
  43
  44         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
  45 }
  46
  47 int batadv_originator_init(struct batadv_priv *bat_priv)
  48 {
  49         if (bat_priv->orig_hash)
  50                 return 0;
  51
  52         bat_priv->orig_hash = batadv_hash_new(1024);
  53
  54         if (!bat_priv->orig_hash)
  55                 goto err;
  56
  57         batadv_hash_set_lock_class(bat_priv->orig_hash,
  58                                    &batadv_orig_hash_lock_class_key);
  59
  60         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
  61         queue_delayed_work(batadv_event_workqueue,
  62                            &bat_priv->orig_work,
  63                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
  64
  65         return 0;
  66
  67 err:
  68         return -ENOMEM;
  69 }
  70
  71 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
  72 {
  73         if (atomic_dec_and_test(&neigh_node->refcount))
  74                 kfree_rcu(neigh_node, rcu);
  75 }
  76
  77 /* increases the refcounter of a found router */
  78 struct batadv_neigh_node *
  79 batadv_orig_node_get_router(struct batadv_orig_node *orig_node)
  80 {
  81         struct batadv_neigh_node *router;
  82
  83         rcu_read_lock();
  84         router = rcu_dereference(orig_node->router);
  85
  86         if (router && !atomic_inc_not_zero(&router->refcount))
  87                 router = NULL;
  88
  89         rcu_read_unlock();
  90         return router;
  91 }
  92
  93 struct batadv_neigh_node *
  94 batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
  95                       const uint8_t *neigh_addr, uint32_t seqno)
  96 {
  97         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
  98         struct batadv_neigh_node *neigh_node;
  99
 100         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 101         if (!neigh_node)
 102                 goto out;
 103
 104         INIT_HLIST_NODE(&neigh_node->list);
 105
 106         memcpy(neigh_node->addr, neigh_addr, ETH_ALEN);
 107         spin_lock_init(&neigh_node->lq_update_lock);
 108
 109         /* extra reference for return */
 110         atomic_set(&neigh_node->refcount, 2);
 111
 112         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 113                    "Creating new neighbor %pM, initial seqno %d\n",
 114                    neigh_addr, seqno);
 115
 116 out:
 117         return neigh_node;
 118 }
 119
 120 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 121 {
 122         struct hlist_node *node_tmp;
 123         struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
 124         struct batadv_orig_node *orig_node;
 125
 126         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 127
 128         spin_lock_bh(&orig_node->neigh_list_lock);
 129
 130         /* for all bonding members ... */
 131         list_for_each_entry_safe(neigh_node, tmp_neigh_node,
 132                                  &orig_node->bond_list, bonding_list) {
 133                 list_del_rcu(&neigh_node->bonding_list);
 134                 batadv_neigh_node_free_ref(neigh_node);
 135         }
 136
 137         /* for all neighbors towards this originator ... */
 138         hlist_for_each_entry_safe(neigh_node, node_tmp,
 139                                   &orig_node->neigh_list, list) {
 140                 hlist_del_rcu(&neigh_node->list);
 141                 batadv_neigh_node_free_ref(neigh_node);
 142         }
 143
 144         spin_unlock_bh(&orig_node->neigh_list_lock);
 145
 146         /* Free nc_nodes */
 147         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 148
 149         batadv_frag_list_free(&orig_node->frag_list);
 150         batadv_tt_global_del_orig(orig_node->bat_priv, orig_node,
 151                                   "originator timed out");
 152
 153         kfree(orig_node->tt_buff);
 154         kfree(orig_node->bcast_own);
 155         kfree(orig_node->bcast_own_sum);
 156         kfree(orig_node);
 157 }
 158
 159 /**
 160  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 161  * schedule an rcu callback for freeing it
 162  * @orig_node: the orig node to free
 163  */
 164 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 165 {
 166         if (atomic_dec_and_test(&orig_node->refcount))
 167                 call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 168 }
 169
 170 /**
 171  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 172  * possibly free it (without rcu callback)
 173  * @orig_node: the orig node to free
 174  */
 175 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 176 {
 177         if (atomic_dec_and_test(&orig_node->refcount))
 178                 batadv_orig_node_free_rcu(&orig_node->rcu);
 179 }
 180
 181 void batadv_originator_free(struct batadv_priv *bat_priv)
 182 {
 183         struct batadv_hashtable *hash = bat_priv->orig_hash;
 184         struct hlist_node *node_tmp;
 185         struct hlist_head *head;
 186         spinlock_t *list_lock; /* spinlock to protect write access */
 187         struct batadv_orig_node *orig_node;
 188         uint32_t i;
 189
 190         if (!hash)
 191                 return;
 192
 193         cancel_delayed_work_sync(&bat_priv->orig_work);
 194
 195         bat_priv->orig_hash = NULL;
 196
 197         for (i = 0; i < hash->size; i++) {
 198                 head = &hash->table[i];
 199                 list_lock = &hash->list_locks[i];
 200
 201                 spin_lock_bh(list_lock);
 202                 hlist_for_each_entry_safe(orig_node, node_tmp,
 203                                           head, hash_entry) {
 204                         hlist_del_rcu(&orig_node->hash_entry);
 205                         batadv_orig_node_free_ref(orig_node);
 206                 }
 207                 spin_unlock_bh(list_lock);
 208         }
 209
 210         batadv_hash_destroy(hash);
 211 }
 212
 213 /* this function finds or creates an originator entry for the given
 214  * address if it does not exits
 215  */
 216 struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 217                                               const uint8_t *addr)
 218 {
 219         struct batadv_orig_node *orig_node;
 220         int size;
 221         int hash_added;
 222         unsigned long reset_time;
 223
 224         orig_node = batadv_orig_hash_find(bat_priv, addr);
 225         if (orig_node)
 226                 return orig_node;
 227
 228         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 229                    "Creating new originator: %pM\n", addr);
 230
 231         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 232         if (!orig_node)
 233                 return NULL;
 234
 235         INIT_HLIST_HEAD(&orig_node->neigh_list);
 236         INIT_LIST_HEAD(&orig_node->bond_list);
 237         spin_lock_init(&orig_node->ogm_cnt_lock);
 238         spin_lock_init(&orig_node->bcast_seqno_lock);
 239         spin_lock_init(&orig_node->neigh_list_lock);
 240         spin_lock_init(&orig_node->tt_buff_lock);
 241
 242         batadv_nc_init_orig(orig_node);
 243
 244         /* extra reference for return */
 245         atomic_set(&orig_node->refcount, 2);
 246
 247         orig_node->tt_initialised = false;
 248         orig_node->bat_priv = bat_priv;
 249         memcpy(orig_node->orig, addr, ETH_ALEN);
 250         batadv_dat_init_orig_node_addr(orig_node);
 251         orig_node->router = NULL;
 252         orig_node->tt_crc = 0;
 253         atomic_set(&orig_node->last_ttvn, 0);
 254         orig_node->tt_buff = NULL;
 255         orig_node->tt_buff_len = 0;
 256         atomic_set(&orig_node->tt_size, 0);
 257         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 258         orig_node->bcast_seqno_reset = reset_time;
 259         orig_node->batman_seqno_reset = reset_time;
 260
 261         atomic_set(&orig_node->bond_candidates, 0);
 262
 263         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 264
 265         orig_node->bcast_own = kzalloc(size, GFP_ATOMIC);
 266         if (!orig_node->bcast_own)
 267                 goto free_orig_node;
 268
 269         size = bat_priv->num_ifaces * sizeof(uint8_t);
 270         orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 271
 272         INIT_LIST_HEAD(&orig_node->frag_list);
 273         orig_node->last_frag_packet = 0;
 274
 275         if (!orig_node->bcast_own_sum)
 276                 goto free_bcast_own;
 277
 278         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 279                                      batadv_choose_orig, orig_node,
 280                                      &orig_node->hash_entry);
 281         if (hash_added != 0)
 282                 goto free_bcast_own_sum;
 283
 284         return orig_node;
 285 free_bcast_own_sum:
 286         kfree(orig_node->bcast_own_sum);
 287 free_bcast_own:
 288         kfree(orig_node->bcast_own);
 289 free_orig_node:
 290         kfree(orig_node);
 291         return NULL;
 292 }
 293
 294 static bool
 295 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 296                             struct batadv_orig_node *orig_node,
 297                             struct batadv_neigh_node **best_neigh_node)
 298 {
 299         struct hlist_node *node_tmp;
 300         struct batadv_neigh_node *neigh_node;
 301         bool neigh_purged = false;
 302         unsigned long last_seen;
 303         struct batadv_hard_iface *if_incoming;
 304
 305         *best_neigh_node = NULL;
 306
 307         spin_lock_bh(&orig_node->neigh_list_lock);
 308
 309         /* for all neighbors towards this originator ... */
 310         hlist_for_each_entry_safe(neigh_node, node_tmp,
 311                                   &orig_node->neigh_list, list) {
 312                 last_seen = neigh_node->last_seen;
 313                 if_incoming = neigh_node->if_incoming;
 314
 315                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 316                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 317                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 318                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 319                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 320                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 321                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 322                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 323                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 324                                            orig_node->orig, neigh_node->addr,
 325                                            if_incoming->net_dev->name);
 326                         else
 327                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 328                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 329                                            orig_node->orig, neigh_node->addr,
 330                                            jiffies_to_msecs(last_seen));
 331
 332                         neigh_purged = true;
 333
 334                         hlist_del_rcu(&neigh_node->list);
 335                         batadv_bonding_candidate_del(orig_node, neigh_node);
 336                         batadv_neigh_node_free_ref(neigh_node);
 337                 } else {
 338                         if ((!*best_neigh_node) ||
 339                             (neigh_node->tq_avg > (*best_neigh_node)->tq_avg))
 340                                 *best_neigh_node = neigh_node;
 341                 }
 342         }
 343
 344         spin_unlock_bh(&orig_node->neigh_list_lock);
 345         return neigh_purged;
 346 }
 347
 348 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 349                                    struct batadv_orig_node *orig_node)
 350 {
 351         struct batadv_neigh_node *best_neigh_node;
 352
 353         if (batadv_has_timed_out(orig_node->last_seen,
 354                                  2 * BATADV_PURGE_TIMEOUT)) {
 355                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 356                            "Originator timeout: originator %pM, last_seen %u\n",
 357                            orig_node->orig,
 358                            jiffies_to_msecs(orig_node->last_seen));
 359                 return true;
 360         } else {
 361                 if (batadv_purge_orig_neighbors(bat_priv, orig_node,
 362                                                 &best_neigh_node))
 363                         batadv_update_route(bat_priv, orig_node,
 364                                             best_neigh_node);
 365         }
 366
 367         return false;
 368 }
 369
 370 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 371 {
 372         struct batadv_hashtable *hash = bat_priv->orig_hash;
 373         struct hlist_node *node_tmp;
 374         struct hlist_head *head;
 375         spinlock_t *list_lock; /* spinlock to protect write access */
 376         struct batadv_orig_node *orig_node;
 377         uint32_t i;
 378
 379         if (!hash)
 380                 return;
 381
 382         /* for all origins... */
 383         for (i = 0; i < hash->size; i++) {
 384                 head = &hash->table[i];
 385                 list_lock = &hash->list_locks[i];
 386
 387                 spin_lock_bh(list_lock);
 388                 hlist_for_each_entry_safe(orig_node, node_tmp,
 389                                           head, hash_entry) {
 390                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
 391                                 if (orig_node->gw_flags)
 392                                         batadv_gw_node_delete(bat_priv,
 393                                                               orig_node);
 394                                 hlist_del_rcu(&orig_node->hash_entry);
 395                                 batadv_orig_node_free_ref(orig_node);
 396                                 continue;
 397                         }
 398
 399                         if (batadv_has_timed_out(orig_node->last_frag_packet,
 400                                                  BATADV_FRAG_TIMEOUT))
 401                                 batadv_frag_list_free(&orig_node->frag_list);
 402                 }
 403                 spin_unlock_bh(list_lock);
 404         }
 405
 406         batadv_gw_node_purge(bat_priv);
 407         batadv_gw_election(bat_priv);
 408 }
 409
 410 static void batadv_purge_orig(struct work_struct *work)
 411 {
 412         struct delayed_work *delayed_work;
 413         struct batadv_priv *bat_priv;
 414
 415         delayed_work = container_of(work, struct delayed_work, work);
 416         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
 417         _batadv_purge_orig(bat_priv);
 418         queue_delayed_work(batadv_event_workqueue,
 419                            &bat_priv->orig_work,
 420                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 421 }
 422
 423 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
 424 {
 425         _batadv_purge_orig(bat_priv);
 426 }
 427
 428 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
 429 {
 430         struct net_device *net_dev = (struct net_device *)seq->private;
 431         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 432         struct batadv_hashtable *hash = bat_priv->orig_hash;
 433         struct hlist_head *head;
 434         struct batadv_hard_iface *primary_if;
 435         struct batadv_orig_node *orig_node;
 436         struct batadv_neigh_node *neigh_node, *neigh_node_tmp;
 437         int batman_count = 0;
 438         int last_seen_secs;
 439         int last_seen_msecs;
 440         unsigned long last_seen_jiffies;
 441         uint32_t i;
 442
 443         primary_if = batadv_seq_print_text_primary_if_get(seq);
 444         if (!primary_if)
 445                 goto out;
 446
 447         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n",
 448                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 449                    primary_if->net_dev->dev_addr, net_dev->name);
 450         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
 451                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
 452                    "Nexthop", "outgoingIF", "Potential nexthops");
 453
 454         for (i = 0; i < hash->size; i++) {
 455                 head = &hash->table[i];
 456
 457                 rcu_read_lock();
 458                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 459                         neigh_node = batadv_orig_node_get_router(orig_node);
 460                         if (!neigh_node)
 461                                 continue;
 462
 463                         if (neigh_node->tq_avg == 0)
 464                                 goto next;
 465
 466                         last_seen_jiffies = jiffies - orig_node->last_seen;
 467                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 468                         last_seen_secs = last_seen_msecs / 1000;
 469                         last_seen_msecs = last_seen_msecs % 1000;
 470
 471                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
 472                                    orig_node->orig, last_seen_secs,
 473                                    last_seen_msecs, neigh_node->tq_avg,
 474                                    neigh_node->addr,
 475                                    neigh_node->if_incoming->net_dev->name);
 476
 477                         hlist_for_each_entry_rcu(neigh_node_tmp,
 478                                                  &orig_node->neigh_list, list) {
 479                                 seq_printf(seq, " %pM (%3i)",
 480                                            neigh_node_tmp->addr,
 481                                            neigh_node_tmp->tq_avg);
 482                         }
 483
 484                         seq_puts(seq, "\n");
 485                         batman_count++;
 486
 487 next:
 488                         batadv_neigh_node_free_ref(neigh_node);
 489                 }
 490                 rcu_read_unlock();
 491         }
 492
 493         if (batman_count == 0)
 494                 seq_puts(seq, "No batman nodes in range ...\n");
 495
 496 out:
 497         if (primary_if)
 498                 batadv_hardif_free_ref(primary_if);
 499         return 0;
 500 }
 501
 502 static int batadv_orig_node_add_if(struct batadv_orig_node *orig_node,
 503                                    int max_if_num)
 504 {
 505         void *data_ptr;
 506         size_t data_size, old_size;
 507
 508         data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS;
 509         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 510         data_ptr = kmalloc(data_size, GFP_ATOMIC);
 511         if (!data_ptr)
 512                 return -ENOMEM;
 513
 514         memcpy(data_ptr, orig_node->bcast_own, old_size);
 515         kfree(orig_node->bcast_own);
 516         orig_node->bcast_own = data_ptr;
 517
 518         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 519         if (!data_ptr)
 520                 return -ENOMEM;
 521
 522         memcpy(data_ptr, orig_node->bcast_own_sum,
 523                (max_if_num - 1) * sizeof(uint8_t));
 524         kfree(orig_node->bcast_own_sum);
 525         orig_node->bcast_own_sum = data_ptr;
 526
 527         return 0;
 528 }
 529
 530 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
 531                             int max_if_num)
 532 {
 533         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 534         struct batadv_hashtable *hash = bat_priv->orig_hash;
 535         struct hlist_head *head;
 536         struct batadv_orig_node *orig_node;
 537         uint32_t i;
 538         int ret;
 539
 540         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 541          * if_num
 542          */
 543         for (i = 0; i < hash->size; i++) {
 544                 head = &hash->table[i];
 545
 546                 rcu_read_lock();
 547                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 548                         spin_lock_bh(&orig_node->ogm_cnt_lock);
 549                         ret = batadv_orig_node_add_if(orig_node, max_if_num);
 550                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 551
 552                         if (ret == -ENOMEM)
 553                                 goto err;
 554                 }
 555                 rcu_read_unlock();
 556         }
 557
 558         return 0;
 559
 560 err:
 561         rcu_read_unlock();
 562         return -ENOMEM;
 563 }
 564
 565 static int batadv_orig_node_del_if(struct batadv_orig_node *orig_node,
 566                                    int max_if_num, int del_if_num)
 567 {
 568         void *data_ptr = NULL;
 569         int chunk_size;
 570
 571         /* last interface was removed */
 572         if (max_if_num == 0)
 573                 goto free_bcast_own;
 574
 575         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 576         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 577         if (!data_ptr)
 578                 return -ENOMEM;
 579
 580         /* copy first part */
 581         memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
 582
 583         /* copy second part */
 584         memcpy((char *)data_ptr + del_if_num * chunk_size,
 585                orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
 586                (max_if_num - del_if_num) * chunk_size);
 587
 588 free_bcast_own:
 589         kfree(orig_node->bcast_own);
 590         orig_node->bcast_own = data_ptr;
 591
 592         if (max_if_num == 0)
 593                 goto free_own_sum;
 594
 595         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 596         if (!data_ptr)
 597                 return -ENOMEM;
 598
 599         memcpy(data_ptr, orig_node->bcast_own_sum,
 600                del_if_num * sizeof(uint8_t));
 601
 602         memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
 603                orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
 604                (max_if_num - del_if_num) * sizeof(uint8_t));
 605
 606 free_own_sum:
 607         kfree(orig_node->bcast_own_sum);
 608         orig_node->bcast_own_sum = data_ptr;
 609
 610         return 0;
 611 }
 612
 613 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
 614                             int max_if_num)
 615 {
 616         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 617         struct batadv_hashtable *hash = bat_priv->orig_hash;
 618         struct hlist_head *head;
 619         struct batadv_hard_iface *hard_iface_tmp;
 620         struct batadv_orig_node *orig_node;
 621         uint32_t i;
 622         int ret;
 623
 624         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 625          * if_num
 626          */
 627         for (i = 0; i < hash->size; i++) {
 628                 head = &hash->table[i];
 629
 630                 rcu_read_lock();
 631                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 632                         spin_lock_bh(&orig_node->ogm_cnt_lock);
 633                         ret = batadv_orig_node_del_if(orig_node, max_if_num,
 634                                                       hard_iface->if_num);
 635                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 636
 637                         if (ret == -ENOMEM)
 638                                 goto err;
 639                 }
 640                 rcu_read_unlock();
 641         }
 642
 643         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
 644         rcu_read_lock();
 645         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
 646                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
 647                         continue;
 648
 649                 if (hard_iface == hard_iface_tmp)
 650                         continue;
 651
 652                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
 653                         continue;
 654
 655                 if (hard_iface_tmp->if_num > hard_iface->if_num)
 656                         hard_iface_tmp->if_num--;
 657         }
 658         rcu_read_unlock();
 659
 660         hard_iface->if_num = -1;
 661         return 0;
 662
 663 err:
 664         rcu_read_unlock();
 665         return -ENOMEM;
 666 }