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 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 /**
  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->bcast_own);
 246         kfree(orig_node->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 /* this function finds or creates an originator entry for the given
 305  * address if it does not exits
 306  */
 307 struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 308                                               const uint8_t *addr)
 309 {
 310         struct batadv_orig_node *orig_node;
 311         struct batadv_orig_node_vlan *vlan;
 312         int size, i;
 313         int hash_added;
 314         unsigned long reset_time;
 315
 316         orig_node = batadv_orig_hash_find(bat_priv, addr);
 317         if (orig_node)
 318                 return orig_node;
 319
 320         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 321                    "Creating new originator: %pM\n", addr);
 322
 323         orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
 324         if (!orig_node)
 325                 return NULL;
 326
 327         INIT_HLIST_HEAD(&orig_node->neigh_list);
 328         INIT_LIST_HEAD(&orig_node->bond_list);
 329         INIT_LIST_HEAD(&orig_node->vlan_list);
 330         spin_lock_init(&orig_node->ogm_cnt_lock);
 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         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 367
 368         orig_node->bcast_own = kzalloc(size, GFP_ATOMIC);
 369         if (!orig_node->bcast_own)
 370                 goto free_vlan;
 371
 372         size = bat_priv->num_ifaces * sizeof(uint8_t);
 373         orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 374
 375         for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
 376                 INIT_HLIST_HEAD(&orig_node->fragments[i].head);
 377                 spin_lock_init(&orig_node->fragments[i].lock);
 378                 orig_node->fragments[i].size = 0;
 379         }
 380
 381         if (!orig_node->bcast_own_sum)
 382                 goto free_bcast_own;
 383
 384         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 385                                      batadv_choose_orig, orig_node,
 386                                      &orig_node->hash_entry);
 387         if (hash_added != 0)
 388                 goto free_bcast_own_sum;
 389
 390         return orig_node;
 391 free_bcast_own_sum:
 392         kfree(orig_node->bcast_own_sum);
 393 free_bcast_own:
 394         kfree(orig_node->bcast_own);
 395 free_vlan:
 396         batadv_orig_node_vlan_free_ref(vlan);
 397 free_orig_node:
 398         kfree(orig_node);
 399         return NULL;
 400 }
 401
 402 static bool
 403 batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
 404                             struct batadv_orig_node *orig_node,
 405                             struct batadv_neigh_node **best_neigh_node)
 406 {
 407         struct hlist_node *node_tmp;
 408         struct batadv_neigh_node *neigh_node;
 409         bool neigh_purged = false;
 410         unsigned long last_seen;
 411         struct batadv_hard_iface *if_incoming;
 412         uint8_t best_metric = 0;
 413
 414         *best_neigh_node = NULL;
 415
 416         spin_lock_bh(&orig_node->neigh_list_lock);
 417
 418         /* for all neighbors towards this originator ... */
 419         hlist_for_each_entry_safe(neigh_node, node_tmp,
 420                                   &orig_node->neigh_list, list) {
 421                 last_seen = neigh_node->last_seen;
 422                 if_incoming = neigh_node->if_incoming;
 423
 424                 if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
 425                     (if_incoming->if_status == BATADV_IF_INACTIVE) ||
 426                     (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 427                     (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
 428                         if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
 429                             (if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
 430                             (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
 431                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 432                                            "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
 433                                            orig_node->orig, neigh_node->addr,
 434                                            if_incoming->net_dev->name);
 435                         else
 436                                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 437                                            "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
 438                                            orig_node->orig, neigh_node->addr,
 439                                            jiffies_to_msecs(last_seen));
 440
 441                         neigh_purged = true;
 442
 443                         hlist_del_rcu(&neigh_node->list);
 444                         batadv_bonding_candidate_del(orig_node, neigh_node);
 445                         batadv_neigh_node_free_ref(neigh_node);
 446                 } else {
 447                         if ((!*best_neigh_node) ||
 448                             (neigh_node->bat_iv.tq_avg > best_metric)) {
 449                                 *best_neigh_node = neigh_node;
 450                                 best_metric = neigh_node->bat_iv.tq_avg;
 451                         }
 452                 }
 453         }
 454
 455         spin_unlock_bh(&orig_node->neigh_list_lock);
 456         return neigh_purged;
 457 }
 458
 459 static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 460                                    struct batadv_orig_node *orig_node)
 461 {
 462         struct batadv_neigh_node *best_neigh_node;
 463
 464         if (batadv_has_timed_out(orig_node->last_seen,
 465                                  2 * BATADV_PURGE_TIMEOUT)) {
 466                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 467                            "Originator timeout: originator %pM, last_seen %u\n",
 468                            orig_node->orig,
 469                            jiffies_to_msecs(orig_node->last_seen));
 470                 return true;
 471         } else {
 472                 if (batadv_purge_orig_neighbors(bat_priv, orig_node,
 473                                                 &best_neigh_node))
 474                         batadv_update_route(bat_priv, orig_node,
 475                                             best_neigh_node);
 476         }
 477
 478         return false;
 479 }
 480
 481 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 482 {
 483         struct batadv_hashtable *hash = bat_priv->orig_hash;
 484         struct hlist_node *node_tmp;
 485         struct hlist_head *head;
 486         spinlock_t *list_lock; /* spinlock to protect write access */
 487         struct batadv_orig_node *orig_node;
 488         uint32_t i;
 489
 490         if (!hash)
 491                 return;
 492
 493         /* for all origins... */
 494         for (i = 0; i < hash->size; i++) {
 495                 head = &hash->table[i];
 496                 list_lock = &hash->list_locks[i];
 497
 498                 spin_lock_bh(list_lock);
 499                 hlist_for_each_entry_safe(orig_node, node_tmp,
 500                                           head, hash_entry) {
 501                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
 502                                 batadv_gw_node_delete(bat_priv, orig_node);
 503                                 hlist_del_rcu(&orig_node->hash_entry);
 504                                 batadv_orig_node_free_ref(orig_node);
 505                                 continue;
 506                         }
 507
 508                         batadv_frag_purge_orig(orig_node,
 509                                                batadv_frag_check_entry);
 510                 }
 511                 spin_unlock_bh(list_lock);
 512         }
 513
 514         batadv_gw_node_purge(bat_priv);
 515         batadv_gw_election(bat_priv);
 516 }
 517
 518 static void batadv_purge_orig(struct work_struct *work)
 519 {
 520         struct delayed_work *delayed_work;
 521         struct batadv_priv *bat_priv;
 522
 523         delayed_work = container_of(work, struct delayed_work, work);
 524         bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
 525         _batadv_purge_orig(bat_priv);
 526         queue_delayed_work(batadv_event_workqueue,
 527                            &bat_priv->orig_work,
 528                            msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
 529 }
 530
 531 void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
 532 {
 533         _batadv_purge_orig(bat_priv);
 534 }
 535
 536 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
 537 {
 538         struct net_device *net_dev = (struct net_device *)seq->private;
 539         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 540         struct batadv_hashtable *hash = bat_priv->orig_hash;
 541         struct hlist_head *head;
 542         struct batadv_hard_iface *primary_if;
 543         struct batadv_orig_node *orig_node;
 544         struct batadv_neigh_node *neigh_node, *neigh_node_tmp;
 545         int batman_count = 0;
 546         int last_seen_secs;
 547         int last_seen_msecs;
 548         unsigned long last_seen_jiffies;
 549         uint32_t i;
 550
 551         primary_if = batadv_seq_print_text_primary_if_get(seq);
 552         if (!primary_if)
 553                 goto out;
 554
 555         seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n",
 556                    BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 557                    primary_if->net_dev->dev_addr, net_dev->name);
 558         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
 559                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
 560                    "Nexthop", "outgoingIF", "Potential nexthops");
 561
 562         for (i = 0; i < hash->size; i++) {
 563                 head = &hash->table[i];
 564
 565                 rcu_read_lock();
 566                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 567                         neigh_node = batadv_orig_node_get_router(orig_node);
 568                         if (!neigh_node)
 569                                 continue;
 570
 571                         if (neigh_node->bat_iv.tq_avg == 0)
 572                                 goto next;
 573
 574                         last_seen_jiffies = jiffies - orig_node->last_seen;
 575                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 576                         last_seen_secs = last_seen_msecs / 1000;
 577                         last_seen_msecs = last_seen_msecs % 1000;
 578
 579                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
 580                                    orig_node->orig, last_seen_secs,
 581                                    last_seen_msecs, neigh_node->bat_iv.tq_avg,
 582                                    neigh_node->addr,
 583                                    neigh_node->if_incoming->net_dev->name);
 584
 585                         hlist_for_each_entry_rcu(neigh_node_tmp,
 586                                                  &orig_node->neigh_list, list) {
 587                                 seq_printf(seq, " %pM (%3i)",
 588                                            neigh_node_tmp->addr,
 589                                            neigh_node_tmp->bat_iv.tq_avg);
 590                         }
 591
 592                         seq_puts(seq, "\n");
 593                         batman_count++;
 594
 595 next:
 596                         batadv_neigh_node_free_ref(neigh_node);
 597                 }
 598                 rcu_read_unlock();
 599         }
 600
 601         if (batman_count == 0)
 602                 seq_puts(seq, "No batman nodes in range ...\n");
 603
 604 out:
 605         if (primary_if)
 606                 batadv_hardif_free_ref(primary_if);
 607         return 0;
 608 }
 609
 610 static int batadv_orig_node_add_if(struct batadv_orig_node *orig_node,
 611                                    int max_if_num)
 612 {
 613         void *data_ptr;
 614         size_t data_size, old_size;
 615
 616         data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS;
 617         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 618         data_ptr = kmalloc(data_size, GFP_ATOMIC);
 619         if (!data_ptr)
 620                 return -ENOMEM;
 621
 622         memcpy(data_ptr, orig_node->bcast_own, old_size);
 623         kfree(orig_node->bcast_own);
 624         orig_node->bcast_own = data_ptr;
 625
 626         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 627         if (!data_ptr)
 628                 return -ENOMEM;
 629
 630         memcpy(data_ptr, orig_node->bcast_own_sum,
 631                (max_if_num - 1) * sizeof(uint8_t));
 632         kfree(orig_node->bcast_own_sum);
 633         orig_node->bcast_own_sum = data_ptr;
 634
 635         return 0;
 636 }
 637
 638 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
 639                             int max_if_num)
 640 {
 641         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 642         struct batadv_hashtable *hash = bat_priv->orig_hash;
 643         struct hlist_head *head;
 644         struct batadv_orig_node *orig_node;
 645         uint32_t i;
 646         int ret;
 647
 648         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 649          * if_num
 650          */
 651         for (i = 0; i < hash->size; i++) {
 652                 head = &hash->table[i];
 653
 654                 rcu_read_lock();
 655                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 656                         spin_lock_bh(&orig_node->ogm_cnt_lock);
 657                         ret = batadv_orig_node_add_if(orig_node, max_if_num);
 658                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 659
 660                         if (ret == -ENOMEM)
 661                                 goto err;
 662                 }
 663                 rcu_read_unlock();
 664         }
 665
 666         return 0;
 667
 668 err:
 669         rcu_read_unlock();
 670         return -ENOMEM;
 671 }
 672
 673 static int batadv_orig_node_del_if(struct batadv_orig_node *orig_node,
 674                                    int max_if_num, int del_if_num)
 675 {
 676         void *data_ptr = NULL;
 677         int chunk_size;
 678
 679         /* last interface was removed */
 680         if (max_if_num == 0)
 681                 goto free_bcast_own;
 682
 683         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 684         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 685         if (!data_ptr)
 686                 return -ENOMEM;
 687
 688         /* copy first part */
 689         memcpy(data_ptr, orig_node->bcast_own, del_if_num * chunk_size);
 690
 691         /* copy second part */
 692         memcpy((char *)data_ptr + del_if_num * chunk_size,
 693                orig_node->bcast_own + ((del_if_num + 1) * chunk_size),
 694                (max_if_num - del_if_num) * chunk_size);
 695
 696 free_bcast_own:
 697         kfree(orig_node->bcast_own);
 698         orig_node->bcast_own = data_ptr;
 699
 700         if (max_if_num == 0)
 701                 goto free_own_sum;
 702
 703         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 704         if (!data_ptr)
 705                 return -ENOMEM;
 706
 707         memcpy(data_ptr, orig_node->bcast_own_sum,
 708                del_if_num * sizeof(uint8_t));
 709
 710         memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
 711                orig_node->bcast_own_sum + ((del_if_num + 1) * sizeof(uint8_t)),
 712                (max_if_num - del_if_num) * sizeof(uint8_t));
 713
 714 free_own_sum:
 715         kfree(orig_node->bcast_own_sum);
 716         orig_node->bcast_own_sum = data_ptr;
 717
 718         return 0;
 719 }
 720
 721 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
 722                             int max_if_num)
 723 {
 724         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 725         struct batadv_hashtable *hash = bat_priv->orig_hash;
 726         struct hlist_head *head;
 727         struct batadv_hard_iface *hard_iface_tmp;
 728         struct batadv_orig_node *orig_node;
 729         uint32_t i;
 730         int ret;
 731
 732         /* resize all orig nodes because orig_node->bcast_own(_sum) depend on
 733          * if_num
 734          */
 735         for (i = 0; i < hash->size; i++) {
 736                 head = &hash->table[i];
 737
 738                 rcu_read_lock();
 739                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 740                         spin_lock_bh(&orig_node->ogm_cnt_lock);
 741                         ret = batadv_orig_node_del_if(orig_node, max_if_num,
 742                                                       hard_iface->if_num);
 743                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 744
 745                         if (ret == -ENOMEM)
 746                                 goto err;
 747                 }
 748                 rcu_read_unlock();
 749         }
 750
 751         /* renumber remaining batman interfaces _inside_ of orig_hash_lock */
 752         rcu_read_lock();
 753         list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
 754                 if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
 755                         continue;
 756
 757                 if (hard_iface == hard_iface_tmp)
 758                         continue;
 759
 760                 if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
 761                         continue;
 762
 763                 if (hard_iface_tmp->if_num > hard_iface->if_num)
 764                         hard_iface_tmp->if_num--;
 765         }
 766         rcu_read_unlock();
 767
 768         hard_iface->if_num = -1;
 769         return 0;
 770
 771 err:
 772         rcu_read_unlock();
 773         return -ENOMEM;
 774 }