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 #include "fragmentation.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 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 /**
  48  * batadv_orig_node_vlan_get - get an orig_node_vlan object
  49  * @orig_node: the originator serving the VLAN
  50  * @vid: the VLAN identifier
  51  *
  52  * Returns the vlan object identified by vid and belonging to orig_node or NULL
  53  * if it does not exist.
  54  */
  55 struct batadv_orig_node_vlan *
  56 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
  57                           unsigned short vid)
  58 {
  59         struct batadv_orig_node_vlan *vlan = NULL, *tmp;
  60
  61         rcu_read_lock();
  62         list_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
  63                 if (tmp->vid != vid)
  64                         continue;
  65
  66                 if (!atomic_inc_not_zero(&tmp->refcount))
  67                         continue;
  68
  69                 vlan = tmp;
  70
  71                 break;
  72         }
  73         rcu_read_unlock();
  74
  75         return vlan;
  76 }
  77
  78 /**
  79  * batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan
  80  *  object
  81  * @orig_node: the originator serving the VLAN
  82  * @vid: the VLAN identifier
  83  *
  84  * Returns NULL in case of failure or the vlan object identified by vid and
  85  * belonging to orig_node otherwise. The object is created and added to the list
  86  * if it does not exist.
  87  *
  88  * The object is returned with refcounter increased by 1.
  89  */
  90 struct batadv_orig_node_vlan *
  91 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
  92                           unsigned short vid)
  93 {
  94         struct batadv_orig_node_vlan *vlan;
  95
  96         spin_lock_bh(&orig_node->vlan_list_lock);
  97
  98         /* first look if an object for this vid already exists */
  99         vlan = batadv_orig_node_vlan_get(orig_node, vid);
 100         if (vlan)
 101                 goto out;
 102
 103         vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
 104         if (!vlan)
 105                 goto out;
 106
 107         atomic_set(&vlan->refcount, 2);
 108         vlan->vid = vid;
 109
 110         list_add_rcu(&vlan->list, &orig_node->vlan_list);
 111
 112 out:
 113         spin_unlock_bh(&orig_node->vlan_list_lock);
 114
 115         return vlan;
 116 }
 117
 118 /**
 119  * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
 120  *  the originator-vlan object
 121  * @orig_vlan: the originator-vlan object to release
 122  */
 123 void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
 124 {
 125         if (atomic_dec_and_test(&orig_vlan->refcount))
 126                 kfree_rcu(orig_vlan, rcu);
 127 }
 128
 129 int batadv_originator_init(struct batadv_priv *bat_priv)
 130 {
 131         if (bat_priv->orig_hash)
 132                 return 0;
 133
 134         bat_priv->orig_hash = batadv_hash_new(1024);
 135
 136         if (!bat_priv->orig_hash)
 137                 goto err;
 138
 139         batadv_hash_set_lock_class(bat_priv->orig_hash,
 140                                    &batadv_orig_hash_lock_class_key);
 141
 142         INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
 143         queue_delayed_work(batadv_event_workqueue,
 144                            &bat_priv->orig_work,
 145                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 146
 147         return 0;
 148
 149 err:
 150         return -ENOMEM;
 151 }
 152
 153 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
 154 {
 155         if (atomic_dec_and_test(&neigh_node->refcount))
 156                 kfree_rcu(neigh_node, rcu);
 157 }
 158
 159 /* increases the refcounter of a found router */
 160 struct batadv_neigh_node *
 161 batadv_orig_node_get_router(struct batadv_orig_node *orig_node)
 162 {
 163         struct batadv_neigh_node *router;
 164
 165         rcu_read_lock();
 166         router = rcu_dereference(orig_node->router);
 167
 168         if (router && !atomic_inc_not_zero(&router->refcount))
 169                 router = NULL;
 170
 171         rcu_read_unlock();
 172         return router;
 173 }
 174
 175 /**
 176  * batadv_neigh_node_new - create and init a new neigh_node object
 177  * @hard_iface: the interface where the neighbour is connected to
 178  * @neigh_addr: the mac address of the neighbour interface
 179  * @orig_node: originator object representing the neighbour
 180  *
 181  * Allocates a new neigh_node object and initialises all the generic fields.
 182  * Returns the new object or NULL on failure.
 183  */
 184 struct batadv_neigh_node *
 185 batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
 186                       const uint8_t *neigh_addr,
 187                       struct batadv_orig_node *orig_node)
 188 {
 189         struct batadv_neigh_node *neigh_node;
 190
 191         neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
 192         if (!neigh_node)
 193                 goto out;
 194
 195         INIT_HLIST_NODE(&neigh_node->list);
 196
 197         memcpy(neigh_node->addr, neigh_addr, ETH_ALEN);
 198         neigh_node->if_incoming = hard_iface;
 199         neigh_node->orig_node = orig_node;
 200
 201         INIT_LIST_HEAD(&neigh_node->bonding_list);
 202
 203         /* extra reference for return */
 204         atomic_set(&neigh_node->refcount, 2);
 205
 206 out:
 207         return neigh_node;
 208 }
 209
 210 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 211 {
 212         struct hlist_node *node_tmp;
 213         struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
 214         struct batadv_orig_node *orig_node;
 215
 216         orig_node = container_of(rcu, struct batadv_orig_node, rcu);
 217
 218         spin_lock_bh(&orig_node->neigh_list_lock);
 219
 220         /* for all bonding members ... */
 221         list_for_each_entry_safe(neigh_node, tmp_neigh_node,
 222                                  &orig_node->bond_list, bonding_list) {
 223                 list_del_rcu(&neigh_node->bonding_list);
 224                 batadv_neigh_node_free_ref(neigh_node);
 225         }
 226
 227         /* for all neighbors towards this originator ... */
 228         hlist_for_each_entry_safe(neigh_node, node_tmp,
 229                                   &orig_node->neigh_list, list) {
 230                 hlist_del_rcu(&neigh_node->list);
 231                 batadv_neigh_node_free_ref(neigh_node);
 232         }
 233
 234         spin_unlock_bh(&orig_node->neigh_list_lock);
 235
 236         /* Free nc_nodes */
 237         batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 238
 239         batadv_frag_purge_orig(orig_node, NULL);
 240
 241         batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, -1,
 242                                   "originator timed out");
 243
 244         kfree(orig_node->tt_buff);
 245         kfree(orig_node->bat_iv.bcast_own);
 246         kfree(orig_node->bat_iv.bcast_own_sum);
 247         kfree(orig_node);
 248 }
 249
 250 /**
 251  * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
 252  * schedule an rcu callback for freeing it
 253  * @orig_node: the orig node to free
 254  */
 255 void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 256 {
 257         if (atomic_dec_and_test(&orig_node->refcount))
 258                 call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
 259 }
 260
 261 /**
 262  * batadv_orig_node_free_ref_now - decrement the orig node refcounter and
 263  * possibly free it (without rcu callback)
 264  * @orig_node: the orig node to free
 265  */
 266 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
 267 {
 268         if (atomic_dec_and_test(&orig_node->refcount))
 269                 batadv_orig_node_free_rcu(&orig_node->rcu);
 270 }
 271
 272 void batadv_originator_free(struct batadv_priv *bat_priv)
 273 {
 274         struct batadv_hashtable *hash = bat_priv->orig_hash;
 275         struct hlist_node *node_tmp;
 276         struct hlist_head *head;
 277         spinlock_t *list_lock; /* spinlock to protect write access */
 278         struct batadv_orig_node *orig_node;
 279         uint32_t i;
 280
 281         if (!hash)
 282                 return;
 283
 284         cancel_delayed_work_sync(&bat_priv->orig_work);
 285
 286         bat_priv->orig_hash = NULL;
 287
 288         for (i = 0; i < hash->size; i++) {
 289                 head = &hash->table[i];
 290                 list_lock = &hash->list_locks[i];
 291
 292                 spin_lock_bh(list_lock);
 293                 hlist_for_each_entry_safe(orig_node, node_tmp,
 294                                           head, hash_entry) {
 295                         hlist_del_rcu(&orig_node->hash_entry);
 296                         batadv_orig_node_free_ref(orig_node);
 297                 }
 298                 spin_unlock_bh(list_lock);
 299         }
 300
 301         batadv_hash_destroy(hash);
 302 }
 303
 304 /**
 305  * batadv_orig_node_new - creates a new orig_node
 306  * @bat_priv: the bat priv with all the soft interface information
 307  * @addr: the mac address of the originator
 308  *
 309  * Creates a new originator object and initialise all the generic fields.
 310  * The new object is not added to the originator list.
 311  * Returns the newly created object or NULL on failure.
 312  */
 313 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 314                                               const uint8_t *addr)
 315 {
 316         struct batadv_orig_node *orig_node;
 317         struct batadv_orig_node_vlan *vlan;
 318         unsigned long reset_time;
 319         int i;
 320
 321         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 322                    "Creating new originator: %pM\n", addr);
 323
 324         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 325         if (!orig_node)
 326                 return NULL;
 327
 328         INIT_HLIST_HEAD(&orig_node->neigh_list);
 329         INIT_LIST_HEAD(&orig_node->bond_list);
 330         INIT_LIST_HEAD(&orig_node->vlan_list);
 331         spin_lock_init(&orig_node->bcast_seqno_lock);
 332         spin_lock_init(&orig_node->neigh_list_lock);
 333         spin_lock_init(&orig_node->tt_buff_lock);
 334         spin_lock_init(&orig_node->tt_lock);
 335         spin_lock_init(&orig_node->vlan_list_lock);
 336
 337         batadv_nc_init_orig(orig_node);
 338
 339         /* extra reference for return */
 340         atomic_set(&orig_node->refcount, 2);
 341
 342         orig_node->tt_initialised = false;
 343         orig_node->bat_priv = bat_priv;
 344         memcpy(orig_node->orig, addr, ETH_ALEN);
 345         batadv_dat_init_orig_node_addr(orig_node);
 346         orig_node->router = NULL;
 347         atomic_set(&orig_node->last_ttvn, 0);
 348         orig_node->tt_buff = NULL;
 349         orig_node->tt_buff_len = 0;
 350         reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 351         orig_node->bcast_seqno_reset = reset_time;
 352         orig_node->batman_seqno_reset = reset_time;
 353
 354         atomic_set(&orig_node->bond_candidates, 0);
 355
 356         /* create a vlan object for the "untagged" LAN */
 357         vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
 358         if (!vlan)
 359                 goto free_orig_node;
 360         /* batadv_orig_node_vlan_new() increases the refcounter.
 361          * Immediately release vlan since it is not needed anymore in this
 362          * context
 363          */
 364         batadv_orig_node_vlan_free_ref(vlan);
 365
 366         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 367                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 368                 spin_lock_init(&orig_node->fragments[i].lock);
 369                 orig_node->fragments[i].size = 0;
 370         }
 371
 372         return orig_node;
 373 free_orig_node:
 374         kfree(orig_node);
 375         return NULL;
 376 }
 377
 378 static bool
 379 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 380                             struct batadv_orig_node *orig_node,
 381                             struct batadv_neigh_node **best_neigh)
 382 {
 383         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
 384         struct hlist_node *node_tmp;
 385         struct batadv_neigh_node *neigh_node;
 386         bool neigh_purged = false;
 387         unsigned long last_seen;
 388         struct batadv_hard_iface *if_incoming;
 389
 390         *best_neigh = NULL;
 391
 392         spin_lock_bh(&orig_node->neigh_list_lock);
 393
 394         /* for all neighbors towards this originator ... */
 395         hlist_for_each_entry_safe(neigh_node, node_tmp,
 396                                   &orig_node->neigh_list, list) {
 397                 last_seen = neigh_node->last_seen;
 398                 if_incoming = neigh_node->if_incoming;
 399
 400                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 401                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 402                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 403                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 404                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 405                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 406                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 407                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 408                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 409                                            orig_node->orig, neigh_node->addr,
 410                                            if_incoming->net_dev->name);
 411                         else
 412                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 413                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 414                                            orig_node->orig, neigh_node->addr,
 415                                            jiffies_to_msecs(last_seen));
 416
 417                         neigh_purged = true;
 418
 419                         hlist_del_rcu(&neigh_node->list);
 420                         batadv_bonding_candidate_del(orig_node, neigh_node);
 421                         batadv_neigh_node_free_ref(neigh_node);
 422                 } else {
 423                         /* store the best_neighbour if this is the first
 424                          * iteration or if a better neighbor has been found
 425                          */
 426                         if (!*best_neigh ||
 427                             bao->bat_neigh_cmp(neigh_node, *best_neigh) > 0)
 428                                 *best_neigh = neigh_node;
 429                 }
 430         }
 431
 432         spin_unlock_bh(&orig_node->neigh_list_lock);
 433         return neigh_purged;
 434 }
 435
 436 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 437                                    struct batadv_orig_node *orig_node)
 438 {
 439         struct batadv_neigh_node *best_neigh_node;
 440
 441         if (batadv_has_timed_out(orig_node->last_seen,
 442                                  2 * BATADV_PURGE_TIMEOUT)) {
 443                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 444                            "Originator timeout: originator %pM, last_seen %u\n",
 445                            orig_node->orig,
 446                            jiffies_to_msecs(orig_node->last_seen));
 447                 return true;
 448         } else {
 449                 if (batadv_purge_orig_neighbors(bat_priv, orig_node,
 450                                                 &best_neigh_node))
 451                         batadv_update_route(bat_priv, orig_node,
 452                                             best_neigh_node);
 453         }
 454
 455         return false;
 456 }
 457
 458 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 459 {
 460         struct batadv_hashtable *hash = bat_priv->orig_hash;
 461         struct hlist_node *node_tmp;
 462         struct hlist_head *head;
 463         spinlock_t *list_lock; /* spinlock to protect write access */
 464         struct batadv_orig_node *orig_node;
 465         uint32_t i;
 466
 467         if (!hash)
 468                 return;
 469
 470         /* for all origins... */
 471         for (i = 0; i < hash->size; i++) {
 472                 head = &hash->table[i];
 473                 list_lock = &hash->list_locks[i];
 474
 475                 spin_lock_bh(list_lock);
 476                 hlist_for_each_entry_safe(orig_node, node_tmp,
 477                                           head, hash_entry) {
 478                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
 479                                 batadv_gw_node_delete(bat_priv, orig_node);
 480                                 hlist_del_rcu(&orig_node->hash_entry);
 481                                 batadv_orig_node_free_ref(orig_node);
 482                                 continue;
 483                         }
 484
 485                         batadv_frag_purge_orig(orig_node,
 486                                                batadv_frag_check_entry);
 487                 }
 488                 spin_unlock_bh(list_lock);
 489         }
 490
 491         batadv_gw_node_purge(bat_priv);
 492         batadv_gw_election(bat_priv);
 493 }
 494
 495 static void batadv_purge_orig(struct work_struct *work)
 496 {
 497         struct delayed_work *delayed_work;
 498         struct batadv_priv *bat_priv;
 499
 500         delayed_work = container_of(work, struct delayed_work, work);
 501         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
 502         _batadv_purge_orig(bat_priv);
 503         queue_delayed_work(batadv_event_workqueue,
 504                            &bat_priv->orig_work,
 505                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 506 }
 507
 508 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
 509 {
 510         _batadv_purge_orig(bat_priv);
 511 }
 512
 513 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
 514 {
 515         struct net_device *net_dev = (struct net_device *)seq->private;
 516         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 517         struct batadv_hard_iface *primary_if;
 518
 519         primary_if = batadv_seq_print_text_primary_if_get(seq);
 520         if (!primary_if)
 521                 return 0;
 522
 523         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
 524                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 525                    primary_if->net_dev->dev_addr, net_dev->name,
 526                    bat_priv->bat_algo_ops->name);
 527
 528         batadv_hardif_free_ref(primary_if);
 529
 530         if (!bat_priv->bat_algo_ops->bat_orig_print) {
 531                 seq_puts(seq,
 532                          "No printing function for this routing protocol\n");
 533                 return 0;
 534         }
 535
 536         bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq);
 537
 538         return 0;
 539 }
 540
 541 static int batadv_orig_node_add_if(struct batadv_orig_node *orig_node,
 542                                    int max_if_num)
 543 {
 544         void *data_ptr;
 545         size_t data_size, old_size;
 546
 547         data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS;
 548         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 549         data_ptr = kmalloc(data_size, GFP_ATOMIC);
 550         if (!data_ptr)
 551                 return -ENOMEM;
 552
 553         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
 554         kfree(orig_node->bat_iv.bcast_own);
 555         orig_node->bat_iv.bcast_own = data_ptr;
 556
 557         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 558         if (!data_ptr)
 559                 return -ENOMEM;
 560
 561         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 562                (max_if_num - 1) * sizeof(uint8_t));
 563         kfree(orig_node->bat_iv.bcast_own_sum);
 564         orig_node->bat_iv.bcast_own_sum = data_ptr;
 565
 566         return 0;
 567 }
 568
 569 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
 570                             int max_if_num)
 571 {
 572         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 573         struct batadv_hashtable *hash = bat_priv->orig_hash;
 574         struct hlist_head *head;
 575         struct batadv_orig_node *orig_node;
 576         uint32_t i;
 577         int ret;
 578
 579         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 580          * if_num
 581          */
 582         for (i = 0; i < hash->size; i++) {
 583                 head = &hash->table[i];
 584
 585                 rcu_read_lock();
 586                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 587                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 588                         ret = batadv_orig_node_add_if(orig_node, max_if_num);
 589                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 590
 591                         if (ret == -ENOMEM)
 592                                 goto err;
 593                 }
 594                 rcu_read_unlock();
 595         }
 596
 597         return 0;
 598
 599 err:
 600         rcu_read_unlock();
 601         return -ENOMEM;
 602 }
 603
 604 static int batadv_orig_node_del_if(struct batadv_orig_node *orig_node,
 605                                    int max_if_num, int del_if_num)
 606 {
 607         int chunk_size, if_offset;
 608         void *data_ptr = NULL;
 609
 610         /* last interface was removed */
 611         if (max_if_num == 0)
 612                 goto free_bcast_own;
 613
 614         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 615         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 616         if (!data_ptr)
 617                 return -ENOMEM;
 618
 619         /* copy first part */
 620         memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 621
 622         /* copy second part */
 623         memcpy((char *)data_ptr + del_if_num * chunk_size,
 624                orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size),
 625                (max_if_num - del_if_num) * chunk_size);
 626
 627 free_bcast_own:
 628         kfree(orig_node->bat_iv.bcast_own);
 629         orig_node->bat_iv.bcast_own = data_ptr;
 630
 631         if (max_if_num == 0)
 632                 goto free_own_sum;
 633
 634         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 635         if (!data_ptr)
 636                 return -ENOMEM;
 637
 638         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 639                del_if_num * sizeof(uint8_t));
 640
 641         if_offset = (del_if_num + 1) * sizeof(uint8_t);
 642         memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
 643                orig_node->bat_iv.bcast_own_sum + if_offset,
 644                (max_if_num - del_if_num) * sizeof(uint8_t));
 645
 646 free_own_sum:
 647         kfree(orig_node->bat_iv.bcast_own_sum);
 648         orig_node->bat_iv.bcast_own_sum = data_ptr;
 649
 650         return 0;
 651 }
 652
 653 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
 654                             int max_if_num)
 655 {
 656         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 657         struct batadv_hashtable *hash = bat_priv->orig_hash;
 658         struct hlist_head *head;
 659         struct batadv_hard_iface *hard_iface_tmp;
 660         struct batadv_orig_node *orig_node;
 661         uint32_t i;
 662         int ret;
 663
 664         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 665          * if_num
 666          */
 667         for (i = 0; i < hash->size; i++) {
 668                 head = &hash->table[i];
 669
 670                 rcu_read_lock();
 671                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 672                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 673                         ret = batadv_orig_node_del_if(orig_node, max_if_num,
 674                                                       hard_iface->if_num);
 675                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 676
 677                         if (ret == -ENOMEM)
 678                                 goto err;
 679                 }
 680                 rcu_read_unlock();
 681         }
 682
 683         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
 684         rcu_read_lock();
 685         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
 686                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
 687                         continue;
 688
 689                 if (hard_iface == hard_iface_tmp)
 690                         continue;
 691
 692                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
 693                         continue;
 694
 695                 if (hard_iface_tmp->if_num > hard_iface->if_num)
 696                         hard_iface_tmp->if_num--;
 697         }
 698         rcu_read_unlock();
 699
 700         hard_iface->if_num = -1;
 701         return 0;
 702
 703 err:
 704         rcu_read_unlock();
 705         return -ENOMEM;
 706 }