net/batman-adv/translation-table.c

   1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
   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 "translation-table.h"
  22 #include "soft-interface.h"
  23 #include "hard-interface.h"
  24 #include "send.h"
  25 #include "hash.h"
  26 #include "originator.h"
  27 #include "routing.h"
  28 #include "bridge_loop_avoidance.h"
  29
  30 #include <linux/crc16.h>
  31
  32 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
  33                                  struct batadv_orig_node *orig_node);
  34 static void batadv_tt_purge(struct work_struct *work);
  35 static void
  36 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  37 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  38                                  struct batadv_orig_node *orig_node,
  39                                  const unsigned char *addr,
  40                                  const char *message, bool roaming);
  41
  42 /* returns 1 if they are the same mac addr */
  43 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  44 {
  45         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  46                                          hash_entry);
  47
  48         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
  49 }
  50
  51 static void batadv_tt_start_timer(struct batadv_priv *bat_priv)
  52 {
  53         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
  54         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
  55                            msecs_to_jiffies(5000));
  56 }
  57
  58 static struct batadv_tt_common_entry *
  59 batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data)
  60 {
  61         struct hlist_head *head;
  62         struct hlist_node *node;
  63         struct batadv_tt_common_entry *tt_common_entry;
  64         struct batadv_tt_common_entry *tt_common_entry_tmp = NULL;
  65         uint32_t index;
  66
  67         if (!hash)
  68                 return NULL;
  69
  70         index = batadv_choose_orig(data, hash->size);
  71         head = &hash->table[index];
  72
  73         rcu_read_lock();
  74         hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) {
  75                 if (!batadv_compare_eth(tt_common_entry, data))
  76                         continue;
  77
  78                 if (!atomic_inc_not_zero(&tt_common_entry->refcount))
  79                         continue;
  80
  81                 tt_common_entry_tmp = tt_common_entry;
  82                 break;
  83         }
  84         rcu_read_unlock();
  85
  86         return tt_common_entry_tmp;
  87 }
  88
  89 static struct batadv_tt_local_entry *
  90 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data)
  91 {
  92         struct batadv_tt_common_entry *tt_common_entry;
  93         struct batadv_tt_local_entry *tt_local_entry = NULL;
  94
  95         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data);
  96         if (tt_common_entry)
  97                 tt_local_entry = container_of(tt_common_entry,
  98                                               struct batadv_tt_local_entry,
  99                                               common);
 100         return tt_local_entry;
 101 }
 102
 103 static struct batadv_tt_global_entry *
 104 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data)
 105 {
 106         struct batadv_tt_common_entry *tt_common_entry;
 107         struct batadv_tt_global_entry *tt_global_entry = NULL;
 108
 109         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data);
 110         if (tt_common_entry)
 111                 tt_global_entry = container_of(tt_common_entry,
 112                                                struct batadv_tt_global_entry,
 113                                                common);
 114         return tt_global_entry;
 115
 116 }
 117
 118 static void
 119 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 120 {
 121         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
 122                 kfree_rcu(tt_local_entry, common.rcu);
 123 }
 124
 125 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
 126 {
 127         struct batadv_tt_common_entry *tt_common_entry;
 128         struct batadv_tt_global_entry *tt_global_entry;
 129
 130         tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu);
 131         tt_global_entry = container_of(tt_common_entry,
 132                                        struct batadv_tt_global_entry, common);
 133
 134         kfree(tt_global_entry);
 135 }
 136
 137 static void
 138 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 139 {
 140         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 141                 batadv_tt_global_del_orig_list(tt_global_entry);
 142                 call_rcu(&tt_global_entry->common.rcu,
 143                          batadv_tt_global_entry_free_rcu);
 144         }
 145 }
 146
 147 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 148 {
 149         struct batadv_tt_orig_list_entry *orig_entry;
 150
 151         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 152         batadv_orig_node_free_ref(orig_entry->orig_node);
 153         kfree(orig_entry);
 154 }
 155
 156 static void
 157 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 158 {
 159         if (!atomic_dec_and_test(&orig_entry->refcount))
 160                 return;
 161         /* to avoid race conditions, immediately decrease the tt counter */
 162         atomic_dec(&orig_entry->orig_node->tt_size);
 163         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 164 }
 165
 166 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 167                                   const uint8_t *addr, uint8_t flags)
 168 {
 169         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 170         bool event_removed = false;
 171         bool del_op_requested, del_op_entry;
 172
 173         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 174
 175         if (!tt_change_node)
 176                 return;
 177
 178         tt_change_node->change.flags = flags;
 179         memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
 180
 181         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 182
 183         /* check for ADD+DEL or DEL+ADD events */
 184         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 185         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 186                                  list) {
 187                 if (!batadv_compare_eth(entry->change.addr, addr))
 188                         continue;
 189
 190                 /* DEL+ADD in the same orig interval have no effect and can be
 191                  * removed to avoid silly behaviour on the receiver side. The
 192                  * other way around (ADD+DEL) can happen in case of roaming of
 193                  * a client still in the NEW state. Roaming of NEW clients is
 194                  * now possible due to automatically recognition of "temporary"
 195                  * clients
 196                  */
 197                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 198                 if (!del_op_requested && del_op_entry)
 199                         goto del;
 200                 if (del_op_requested && !del_op_entry)
 201                         goto del;
 202                 continue;
 203 del:
 204                 list_del(&entry->list);
 205                 kfree(entry);
 206                 kfree(tt_change_node);
 207                 event_removed = true;
 208                 goto unlock;
 209         }
 210
 211         /* track the change in the OGMinterval list */
 212         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 213
 214 unlock:
 215         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 216
 217         if (event_removed)
 218                 atomic_dec(&bat_priv->tt.local_changes);
 219         else
 220                 atomic_inc(&bat_priv->tt.local_changes);
 221 }
 222
 223 int batadv_tt_len(int changes_num)
 224 {
 225         return changes_num * sizeof(struct batadv_tt_change);
 226 }
 227
 228 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 229 {
 230         if (bat_priv->tt.local_hash)
 231                 return 0;
 232
 233         bat_priv->tt.local_hash = batadv_hash_new(1024);
 234
 235         if (!bat_priv->tt.local_hash)
 236                 return -ENOMEM;
 237
 238         return 0;
 239 }
 240
 241 void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 242                          int ifindex)
 243 {
 244         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 245         struct batadv_tt_local_entry *tt_local_entry = NULL;
 246         struct batadv_tt_global_entry *tt_global_entry = NULL;
 247         struct hlist_head *head;
 248         struct hlist_node *node;
 249         struct batadv_tt_orig_list_entry *orig_entry;
 250         int hash_added;
 251
 252         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
 253
 254         if (tt_local_entry) {
 255                 tt_local_entry->last_seen = jiffies;
 256                 /* possibly unset the BATADV_TT_CLIENT_PENDING flag */
 257                 tt_local_entry->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 258                 goto out;
 259         }
 260
 261         tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
 262         if (!tt_local_entry)
 263                 goto out;
 264
 265         batadv_dbg(BATADV_DBG_TT, bat_priv,
 266                    "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
 267                    (uint8_t)atomic_read(&bat_priv->tt.vn));
 268
 269         memcpy(tt_local_entry->common.addr, addr, ETH_ALEN);
 270         tt_local_entry->common.flags = BATADV_NO_FLAGS;
 271         if (batadv_is_wifi_iface(ifindex))
 272                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_WIFI;
 273         atomic_set(&tt_local_entry->common.refcount, 2);
 274         tt_local_entry->last_seen = jiffies;
 275         tt_local_entry->common.added_at = tt_local_entry->last_seen;
 276
 277         /* the batman interface mac address should never be purged */
 278         if (batadv_compare_eth(addr, soft_iface->dev_addr))
 279                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 280
 281         /* The local entry has to be marked as NEW to avoid to send it in
 282          * a full table response going out before the next ttvn increment
 283          * (consistency check)
 284          */
 285         tt_local_entry->common.flags |= BATADV_TT_CLIENT_NEW;
 286
 287         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 288                                      batadv_choose_orig,
 289                                      &tt_local_entry->common,
 290                                      &tt_local_entry->common.hash_entry);
 291
 292         if (unlikely(hash_added != 0)) {
 293                 /* remove the reference for the hash */
 294                 batadv_tt_local_entry_free_ref(tt_local_entry);
 295                 goto out;
 296         }
 297
 298         batadv_tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
 299
 300         /* remove address from global hash if present */
 301         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
 302
 303         /* Check whether it is a roaming! */
 304         if (tt_global_entry) {
 305                 /* These node are probably going to update their tt table */
 306                 head = &tt_global_entry->orig_list;
 307                 rcu_read_lock();
 308                 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
 309                         orig_entry->orig_node->tt_poss_change = true;
 310
 311                         batadv_send_roam_adv(bat_priv,
 312                                              tt_global_entry->common.addr,
 313                                              orig_entry->orig_node);
 314                 }
 315                 rcu_read_unlock();
 316                 /* The global entry has to be marked as ROAMING and
 317                  * has to be kept for consistency purpose
 318                  */
 319                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
 320                 tt_global_entry->roam_at = jiffies;
 321         }
 322 out:
 323         if (tt_local_entry)
 324                 batadv_tt_local_entry_free_ref(tt_local_entry);
 325         if (tt_global_entry)
 326                 batadv_tt_global_entry_free_ref(tt_global_entry);
 327 }
 328
 329 static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff,
 330                                           int *packet_buff_len,
 331                                           int min_packet_len,
 332                                           int new_packet_len)
 333 {
 334         unsigned char *new_buff;
 335
 336         new_buff = kmalloc(new_packet_len, GFP_ATOMIC);
 337
 338         /* keep old buffer if kmalloc should fail */
 339         if (new_buff) {
 340                 memcpy(new_buff, *packet_buff, min_packet_len);
 341                 kfree(*packet_buff);
 342                 *packet_buff = new_buff;
 343                 *packet_buff_len = new_packet_len;
 344         }
 345 }
 346
 347 static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv,
 348                                           unsigned char **packet_buff,
 349                                           int *packet_buff_len,
 350                                           int min_packet_len)
 351 {
 352         struct batadv_hard_iface *primary_if;
 353         int req_len;
 354
 355         primary_if = batadv_primary_if_get_selected(bat_priv);
 356
 357         req_len = min_packet_len;
 358         req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes));
 359
 360         /* if we have too many changes for one packet don't send any
 361          * and wait for the tt table request which will be fragmented
 362          */
 363         if ((!primary_if) || (req_len > primary_if->soft_iface->mtu))
 364                 req_len = min_packet_len;
 365
 366         batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
 367                                       min_packet_len, req_len);
 368
 369         if (primary_if)
 370                 batadv_hardif_free_ref(primary_if);
 371 }
 372
 373 static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv,
 374                                        unsigned char **packet_buff,
 375                                        int *packet_buff_len,
 376                                        int min_packet_len)
 377 {
 378         struct batadv_tt_change_node *entry, *safe;
 379         int count = 0, tot_changes = 0, new_len;
 380         unsigned char *tt_buff;
 381
 382         batadv_tt_prepare_packet_buff(bat_priv, packet_buff,
 383                                       packet_buff_len, min_packet_len);
 384
 385         new_len = *packet_buff_len - min_packet_len;
 386         tt_buff = *packet_buff + min_packet_len;
 387
 388         if (new_len > 0)
 389                 tot_changes = new_len / batadv_tt_len(1);
 390
 391         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 392         atomic_set(&bat_priv->tt.local_changes, 0);
 393
 394         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 395                                  list) {
 396                 if (count < tot_changes) {
 397                         memcpy(tt_buff + batadv_tt_len(count),
 398                                &entry->change, sizeof(struct batadv_tt_change));
 399                         count++;
 400                 }
 401                 list_del(&entry->list);
 402                 kfree(entry);
 403         }
 404         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 405
 406         /* Keep the buffer for possible tt_request */
 407         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 408         kfree(bat_priv->tt.last_changeset);
 409         bat_priv->tt.last_changeset_len = 0;
 410         bat_priv->tt.last_changeset = NULL;
 411         /* check whether this new OGM has no changes due to size problems */
 412         if (new_len > 0) {
 413                 /* if kmalloc() fails we will reply with the full table
 414                  * instead of providing the diff
 415                  */
 416                 bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC);
 417                 if (bat_priv->tt.last_changeset) {
 418                         memcpy(bat_priv->tt.last_changeset, tt_buff, new_len);
 419                         bat_priv->tt.last_changeset_len = new_len;
 420                 }
 421         }
 422         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 423
 424         return count;
 425 }
 426
 427 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 428 {
 429         struct net_device *net_dev = (struct net_device *)seq->private;
 430         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 431         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 432         struct batadv_tt_common_entry *tt_common_entry;
 433         struct batadv_hard_iface *primary_if;
 434         struct hlist_node *node;
 435         struct hlist_head *head;
 436         uint32_t i;
 437         int ret = 0;
 438
 439         primary_if = batadv_primary_if_get_selected(bat_priv);
 440         if (!primary_if) {
 441                 ret = seq_printf(seq,
 442                                  "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
 443                                  net_dev->name);
 444                 goto out;
 445         }
 446
 447         if (primary_if->if_status != BATADV_IF_ACTIVE) {
 448                 ret = seq_printf(seq,
 449                                  "BATMAN mesh %s disabled - primary interface not active\n",
 450                                  net_dev->name);
 451                 goto out;
 452         }
 453
 454         seq_printf(seq,
 455                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 456                    net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
 457
 458         for (i = 0; i < hash->size; i++) {
 459                 head = &hash->table[i];
 460
 461                 rcu_read_lock();
 462                 hlist_for_each_entry_rcu(tt_common_entry, node,
 463                                          head, hash_entry) {
 464                         seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
 465                                    tt_common_entry->addr,
 466                                    (tt_common_entry->flags &
 467                                     BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 468                                    (tt_common_entry->flags &
 469                                     BATADV_TT_CLIENT_NOPURGE ? 'P' : '.'),
 470                                    (tt_common_entry->flags &
 471                                     BATADV_TT_CLIENT_NEW ? 'N' : '.'),
 472                                    (tt_common_entry->flags &
 473                                     BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
 474                                    (tt_common_entry->flags &
 475                                     BATADV_TT_CLIENT_WIFI ? 'W' : '.'));
 476                 }
 477                 rcu_read_unlock();
 478         }
 479 out:
 480         if (primary_if)
 481                 batadv_hardif_free_ref(primary_if);
 482         return ret;
 483 }
 484
 485 static void
 486 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
 487                             struct batadv_tt_local_entry *tt_local_entry,
 488                             uint16_t flags, const char *message)
 489 {
 490         batadv_tt_local_event(bat_priv, tt_local_entry->common.addr,
 491                               tt_local_entry->common.flags | flags);
 492
 493         /* The local client has to be marked as "pending to be removed" but has
 494          * to be kept in the table in order to send it in a full table
 495          * response issued before the net ttvn increment (consistency check)
 496          */
 497         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
 498
 499         batadv_dbg(BATADV_DBG_TT, bat_priv,
 500                    "Local tt entry (%pM) pending to be removed: %s\n",
 501                    tt_local_entry->common.addr, message);
 502 }
 503
 504 void batadv_tt_local_remove(struct batadv_priv *bat_priv, const uint8_t *addr,
 505                             const char *message, bool roaming)
 506 {
 507         struct batadv_tt_local_entry *tt_local_entry = NULL;
 508         uint16_t flags;
 509
 510         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
 511         if (!tt_local_entry)
 512                 goto out;
 513
 514         flags = BATADV_TT_CLIENT_DEL;
 515         if (roaming)
 516                 flags |= BATADV_TT_CLIENT_ROAM;
 517
 518         batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, message);
 519 out:
 520         if (tt_local_entry)
 521                 batadv_tt_local_entry_free_ref(tt_local_entry);
 522 }
 523
 524 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
 525                                        struct hlist_head *head)
 526 {
 527         struct batadv_tt_local_entry *tt_local_entry;
 528         struct batadv_tt_common_entry *tt_common_entry;
 529         struct hlist_node *node, *node_tmp;
 530
 531         hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head,
 532                                   hash_entry) {
 533                 tt_local_entry = container_of(tt_common_entry,
 534                                               struct batadv_tt_local_entry,
 535                                               common);
 536                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
 537                         continue;
 538
 539                 /* entry already marked for deletion */
 540                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
 541                         continue;
 542
 543                 if (!batadv_has_timed_out(tt_local_entry->last_seen,
 544                                           BATADV_TT_LOCAL_TIMEOUT))
 545                         continue;
 546
 547                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
 548                                             BATADV_TT_CLIENT_DEL, "timed out");
 549         }
 550 }
 551
 552 static void batadv_tt_local_purge(struct batadv_priv *bat_priv)
 553 {
 554         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 555         struct hlist_head *head;
 556         spinlock_t *list_lock; /* protects write access to the hash lists */
 557         uint32_t i;
 558
 559         for (i = 0; i < hash->size; i++) {
 560                 head = &hash->table[i];
 561                 list_lock = &hash->list_locks[i];
 562
 563                 spin_lock_bh(list_lock);
 564                 batadv_tt_local_purge_list(bat_priv, head);
 565                 spin_unlock_bh(list_lock);
 566         }
 567
 568 }
 569
 570 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
 571 {
 572         struct batadv_hashtable *hash;
 573         spinlock_t *list_lock; /* protects write access to the hash lists */
 574         struct batadv_tt_common_entry *tt_common_entry;
 575         struct batadv_tt_local_entry *tt_local;
 576         struct hlist_node *node, *node_tmp;
 577         struct hlist_head *head;
 578         uint32_t i;
 579
 580         if (!bat_priv->tt.local_hash)
 581                 return;
 582
 583         hash = bat_priv->tt.local_hash;
 584
 585         for (i = 0; i < hash->size; i++) {
 586                 head = &hash->table[i];
 587                 list_lock = &hash->list_locks[i];
 588
 589                 spin_lock_bh(list_lock);
 590                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
 591                                           head, hash_entry) {
 592                         hlist_del_rcu(node);
 593                         tt_local = container_of(tt_common_entry,
 594                                                 struct batadv_tt_local_entry,
 595                                                 common);
 596                         batadv_tt_local_entry_free_ref(tt_local);
 597                 }
 598                 spin_unlock_bh(list_lock);
 599         }
 600
 601         batadv_hash_destroy(hash);
 602
 603         bat_priv->tt.local_hash = NULL;
 604 }
 605
 606 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
 607 {
 608         if (bat_priv->tt.global_hash)
 609                 return 0;
 610
 611         bat_priv->tt.global_hash = batadv_hash_new(1024);
 612
 613         if (!bat_priv->tt.global_hash)
 614                 return -ENOMEM;
 615
 616         return 0;
 617 }
 618
 619 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
 620 {
 621         struct batadv_tt_change_node *entry, *safe;
 622
 623         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 624
 625         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 626                                  list) {
 627                 list_del(&entry->list);
 628                 kfree(entry);
 629         }
 630
 631         atomic_set(&bat_priv->tt.local_changes, 0);
 632         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 633 }
 634
 635 /* retrieves the orig_tt_list_entry belonging to orig_node from the
 636  * batadv_tt_global_entry list
 637  *
 638  * returns it with an increased refcounter, NULL if not found
 639  */
 640 static struct batadv_tt_orig_list_entry *
 641 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
 642                                  const struct batadv_orig_node *orig_node)
 643 {
 644         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
 645         const struct hlist_head *head;
 646         struct hlist_node *node;
 647
 648         rcu_read_lock();
 649         head = &entry->orig_list;
 650         hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
 651                 if (tmp_orig_entry->orig_node != orig_node)
 652                         continue;
 653                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
 654                         continue;
 655
 656                 orig_entry = tmp_orig_entry;
 657                 break;
 658         }
 659         rcu_read_unlock();
 660
 661         return orig_entry;
 662 }
 663
 664 /* find out if an orig_node is already in the list of a tt_global_entry.
 665  * returns true if found, false otherwise
 666  */
 667 static bool
 668 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
 669                                 const struct batadv_orig_node *orig_node)
 670 {
 671         struct batadv_tt_orig_list_entry *orig_entry;
 672         bool found = false;
 673
 674         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
 675         if (orig_entry) {
 676                 found = true;
 677                 batadv_tt_orig_list_entry_free_ref(orig_entry);
 678         }
 679
 680         return found;
 681 }
 682
 683 static void
 684 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
 685                                 struct batadv_orig_node *orig_node, int ttvn)
 686 {
 687         struct batadv_tt_orig_list_entry *orig_entry;
 688
 689         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
 690         if (orig_entry) {
 691                 /* refresh the ttvn: the current value could be a bogus one that
 692                  * was added during a "temporary client detection"
 693                  */
 694                 orig_entry->ttvn = ttvn;
 695                 goto out;
 696         }
 697
 698         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
 699         if (!orig_entry)
 700                 goto out;
 701
 702         INIT_HLIST_NODE(&orig_entry->list);
 703         atomic_inc(&orig_node->refcount);
 704         atomic_inc(&orig_node->tt_size);
 705         orig_entry->orig_node = orig_node;
 706         orig_entry->ttvn = ttvn;
 707         atomic_set(&orig_entry->refcount, 2);
 708
 709         spin_lock_bh(&tt_global->list_lock);
 710         hlist_add_head_rcu(&orig_entry->list,
 711                            &tt_global->orig_list);
 712         spin_unlock_bh(&tt_global->list_lock);
 713 out:
 714         if (orig_entry)
 715                 batadv_tt_orig_list_entry_free_ref(orig_entry);
 716 }
 717
 718 /* caller must hold orig_node refcount */
 719 int batadv_tt_global_add(struct batadv_priv *bat_priv,
 720                          struct batadv_orig_node *orig_node,
 721                          const unsigned char *tt_addr, uint8_t flags,
 722                          uint8_t ttvn)
 723 {
 724         struct batadv_tt_global_entry *tt_global_entry = NULL;
 725         int ret = 0;
 726         int hash_added;
 727         struct batadv_tt_common_entry *common;
 728
 729         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr);
 730
 731         if (!tt_global_entry) {
 732                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
 733                 if (!tt_global_entry)
 734                         goto out;
 735
 736                 common = &tt_global_entry->common;
 737                 memcpy(common->addr, tt_addr, ETH_ALEN);
 738
 739                 common->flags = flags;
 740                 tt_global_entry->roam_at = 0;
 741                 atomic_set(&common->refcount, 2);
 742                 common->added_at = jiffies;
 743
 744                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
 745                 spin_lock_init(&tt_global_entry->list_lock);
 746
 747                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
 748                                              batadv_compare_tt,
 749                                              batadv_choose_orig, common,
 750                                              &common->hash_entry);
 751
 752                 if (unlikely(hash_added != 0)) {
 753                         /* remove the reference for the hash */
 754                         batadv_tt_global_entry_free_ref(tt_global_entry);
 755                         goto out_remove;
 756                 }
 757         } else {
 758                 /* If there is already a global entry, we can use this one for
 759                  * our processing.
 760                  * But if we are trying to add a temporary client we can exit
 761                  * directly because the temporary information should never
 762                  * override any already known client state (whatever it is)
 763                  */
 764                 if (flags & BATADV_TT_CLIENT_TEMP)
 765                         goto out;
 766
 767                 /* if the client was temporary added before receiving the first
 768                  * OGM announcing it, we have to clear the TEMP flag
 769                  */
 770                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_TEMP;
 771
 772                 /* the change can carry possible "attribute" flags like the
 773                  * TT_CLIENT_WIFI, therefore they have to be copied in the
 774                  * client entry
 775                  */
 776                 tt_global_entry->common.flags |= flags;
 777
 778                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
 779                  * one originator left in the list and we previously received a
 780                  * delete + roaming change for this originator.
 781                  *
 782                  * We should first delete the old originator before adding the
 783                  * new one.
 784                  */
 785                 if (tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM) {
 786                         batadv_tt_global_del_orig_list(tt_global_entry);
 787                         tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 788                         tt_global_entry->roam_at = 0;
 789                 }
 790         }
 791         /* add the new orig_entry (if needed) or update it */
 792         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
 793
 794         batadv_dbg(BATADV_DBG_TT, bat_priv,
 795                    "Creating new global tt entry: %pM (via %pM)\n",
 796                    tt_global_entry->common.addr, orig_node->orig);
 797
 798 out_remove:
 799         /* remove address from local hash if present */
 800         batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr,
 801                                "global tt received",
 802                                flags & BATADV_TT_CLIENT_ROAM);
 803         ret = 1;
 804 out:
 805         if (tt_global_entry)
 806                 batadv_tt_global_entry_free_ref(tt_global_entry);
 807         return ret;
 808 }
 809
 810 /* print all orig nodes who announce the address for this global entry.
 811  * it is assumed that the caller holds rcu_read_lock();
 812  */
 813 static void
 814 batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry,
 815                              struct seq_file *seq)
 816 {
 817         struct hlist_head *head;
 818         struct hlist_node *node;
 819         struct batadv_tt_orig_list_entry *orig_entry;
 820         struct batadv_tt_common_entry *tt_common_entry;
 821         uint16_t flags;
 822         uint8_t last_ttvn;
 823
 824         tt_common_entry = &tt_global_entry->common;
 825
 826         head = &tt_global_entry->orig_list;
 827
 828         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
 829                 flags = tt_common_entry->flags;
 830                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
 831                 seq_printf(seq, " * %pM  (%3u) via %pM     (%3u)   [%c%c%c]\n",
 832                            tt_global_entry->common.addr, orig_entry->ttvn,
 833                            orig_entry->orig_node->orig, last_ttvn,
 834                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 835                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 836                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
 837         }
 838 }
 839
 840 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
 841 {
 842         struct net_device *net_dev = (struct net_device *)seq->private;
 843         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 844         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
 845         struct batadv_tt_common_entry *tt_common_entry;
 846         struct batadv_tt_global_entry *tt_global;
 847         struct batadv_hard_iface *primary_if;
 848         struct hlist_node *node;
 849         struct hlist_head *head;
 850         uint32_t i;
 851         int ret = 0;
 852
 853         primary_if = batadv_primary_if_get_selected(bat_priv);
 854         if (!primary_if) {
 855                 ret = seq_printf(seq,
 856                                  "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
 857                                  net_dev->name);
 858                 goto out;
 859         }
 860
 861         if (primary_if->if_status != BATADV_IF_ACTIVE) {
 862                 ret = seq_printf(seq,
 863                                  "BATMAN mesh %s disabled - primary interface not active\n",
 864                                  net_dev->name);
 865                 goto out;
 866         }
 867
 868         seq_printf(seq,
 869                    "Globally announced TT entries received via the mesh %s\n",
 870                    net_dev->name);
 871         seq_printf(seq, "       %-13s %s       %-15s %s %s\n",
 872                    "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
 873
 874         for (i = 0; i < hash->size; i++) {
 875                 head = &hash->table[i];
 876
 877                 rcu_read_lock();
 878                 hlist_for_each_entry_rcu(tt_common_entry, node,
 879                                          head, hash_entry) {
 880                         tt_global = container_of(tt_common_entry,
 881                                                  struct batadv_tt_global_entry,
 882                                                  common);
 883                         batadv_tt_global_print_entry(tt_global, seq);
 884                 }
 885                 rcu_read_unlock();
 886         }
 887 out:
 888         if (primary_if)
 889                 batadv_hardif_free_ref(primary_if);
 890         return ret;
 891 }
 892
 893 /* deletes the orig list of a tt_global_entry */
 894 static void
 895 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
 896 {
 897         struct hlist_head *head;
 898         struct hlist_node *node, *safe;
 899         struct batadv_tt_orig_list_entry *orig_entry;
 900
 901         spin_lock_bh(&tt_global_entry->list_lock);
 902         head = &tt_global_entry->orig_list;
 903         hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
 904                 hlist_del_rcu(node);
 905                 batadv_tt_orig_list_entry_free_ref(orig_entry);
 906         }
 907         spin_unlock_bh(&tt_global_entry->list_lock);
 908
 909 }
 910
 911 static void
 912 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
 913                                 struct batadv_tt_global_entry *tt_global_entry,
 914                                 struct batadv_orig_node *orig_node,
 915                                 const char *message)
 916 {
 917         struct hlist_head *head;
 918         struct hlist_node *node, *safe;
 919         struct batadv_tt_orig_list_entry *orig_entry;
 920
 921         spin_lock_bh(&tt_global_entry->list_lock);
 922         head = &tt_global_entry->orig_list;
 923         hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
 924                 if (orig_entry->orig_node == orig_node) {
 925                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 926                                    "Deleting %pM from global tt entry %pM: %s\n",
 927                                    orig_node->orig,
 928                                    tt_global_entry->common.addr, message);
 929                         hlist_del_rcu(node);
 930                         batadv_tt_orig_list_entry_free_ref(orig_entry);
 931                 }
 932         }
 933         spin_unlock_bh(&tt_global_entry->list_lock);
 934 }
 935
 936 static void
 937 batadv_tt_global_del_struct(struct batadv_priv *bat_priv,
 938                             struct batadv_tt_global_entry *tt_global_entry,
 939                             const char *message)
 940 {
 941         batadv_dbg(BATADV_DBG_TT, bat_priv,
 942                    "Deleting global tt entry %pM: %s\n",
 943                    tt_global_entry->common.addr, message);
 944
 945         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 946                            batadv_choose_orig, tt_global_entry->common.addr);
 947         batadv_tt_global_entry_free_ref(tt_global_entry);
 948
 949 }
 950
 951 /* If the client is to be deleted, we check if it is the last origantor entry
 952  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
 953  * timer, otherwise we simply remove the originator scheduled for deletion.
 954  */
 955 static void
 956 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
 957                              struct batadv_tt_global_entry *tt_global_entry,
 958                              struct batadv_orig_node *orig_node,
 959                              const char *message)
 960 {
 961         bool last_entry = true;
 962         struct hlist_head *head;
 963         struct hlist_node *node;
 964         struct batadv_tt_orig_list_entry *orig_entry;
 965
 966         /* no local entry exists, case 1:
 967          * Check if this is the last one or if other entries exist.
 968          */
 969
 970         rcu_read_lock();
 971         head = &tt_global_entry->orig_list;
 972         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
 973                 if (orig_entry->orig_node != orig_node) {
 974                         last_entry = false;
 975                         break;
 976                 }
 977         }
 978         rcu_read_unlock();
 979
 980         if (last_entry) {
 981                 /* its the last one, mark for roaming. */
 982                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
 983                 tt_global_entry->roam_at = jiffies;
 984         } else
 985                 /* there is another entry, we can simply delete this
 986                  * one and can still use the other one.
 987                  */
 988                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
 989                                                 orig_node, message);
 990 }
 991
 992
 993
 994 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
 995                                  struct batadv_orig_node *orig_node,
 996                                  const unsigned char *addr,
 997                                  const char *message, bool roaming)
 998 {
 999         struct batadv_tt_global_entry *tt_global_entry = NULL;
1000         struct batadv_tt_local_entry *local_entry = NULL;
1001
1002         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
1003         if (!tt_global_entry)
1004                 goto out;
1005
1006         if (!roaming) {
1007                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1008                                                 orig_node, message);
1009
1010                 if (hlist_empty(&tt_global_entry->orig_list))
1011                         batadv_tt_global_del_struct(bat_priv, tt_global_entry,
1012                                                     message);
1013
1014                 goto out;
1015         }
1016
1017         /* if we are deleting a global entry due to a roam
1018          * event, there are two possibilities:
1019          * 1) the client roamed from node A to node B => if there
1020          *    is only one originator left for this client, we mark
1021          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1022          *    wait for node B to claim it. In case of timeout
1023          *    the entry is purged.
1024          *
1025          *    If there are other originators left, we directly delete
1026          *    the originator.
1027          * 2) the client roamed to us => we can directly delete
1028          *    the global entry, since it is useless now.
1029          */
1030         local_entry = batadv_tt_local_hash_find(bat_priv,
1031                                                 tt_global_entry->common.addr);
1032         if (local_entry) {
1033                 /* local entry exists, case 2: client roamed to us. */
1034                 batadv_tt_global_del_orig_list(tt_global_entry);
1035                 batadv_tt_global_del_struct(bat_priv, tt_global_entry, message);
1036         } else
1037                 /* no local entry exists, case 1: check for roaming */
1038                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1039                                              orig_node, message);
1040
1041
1042 out:
1043         if (tt_global_entry)
1044                 batadv_tt_global_entry_free_ref(tt_global_entry);
1045         if (local_entry)
1046                 batadv_tt_local_entry_free_ref(local_entry);
1047 }
1048
1049 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1050                                struct batadv_orig_node *orig_node,
1051                                const char *message)
1052 {
1053         struct batadv_tt_global_entry *tt_global;
1054         struct batadv_tt_common_entry *tt_common_entry;
1055         uint32_t i;
1056         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1057         struct hlist_node *node, *safe;
1058         struct hlist_head *head;
1059         spinlock_t *list_lock; /* protects write access to the hash lists */
1060
1061         if (!hash)
1062                 return;
1063
1064         for (i = 0; i < hash->size; i++) {
1065                 head = &hash->table[i];
1066                 list_lock = &hash->list_locks[i];
1067
1068                 spin_lock_bh(list_lock);
1069                 hlist_for_each_entry_safe(tt_common_entry, node, safe,
1070                                           head, hash_entry) {
1071                         tt_global = container_of(tt_common_entry,
1072                                                  struct batadv_tt_global_entry,
1073                                                  common);
1074
1075                         batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1076                                                         orig_node, message);
1077
1078                         if (hlist_empty(&tt_global->orig_list)) {
1079                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1080                                            "Deleting global tt entry %pM: %s\n",
1081                                            tt_global->common.addr, message);
1082                                 hlist_del_rcu(node);
1083                                 batadv_tt_global_entry_free_ref(tt_global);
1084                         }
1085                 }
1086                 spin_unlock_bh(list_lock);
1087         }
1088         orig_node->tt_initialised = false;
1089 }
1090
1091 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1092                                       char **msg)
1093 {
1094         bool purge = false;
1095         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1096         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1097
1098         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1099             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1100                 purge = true;
1101                 *msg = "Roaming timeout\n";
1102         }
1103
1104         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1105             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1106                 purge = true;
1107                 *msg = "Temporary client timeout\n";
1108         }
1109
1110         return purge;
1111 }
1112
1113 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1114 {
1115         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1116         struct hlist_head *head;
1117         struct hlist_node *node, *node_tmp;
1118         spinlock_t *list_lock; /* protects write access to the hash lists */
1119         uint32_t i;
1120         char *msg = NULL;
1121         struct batadv_tt_common_entry *tt_common;
1122         struct batadv_tt_global_entry *tt_global;
1123
1124         for (i = 0; i < hash->size; i++) {
1125                 head = &hash->table[i];
1126                 list_lock = &hash->list_locks[i];
1127
1128                 spin_lock_bh(list_lock);
1129                 hlist_for_each_entry_safe(tt_common, node, node_tmp, head,
1130                                           hash_entry) {
1131                         tt_global = container_of(tt_common,
1132                                                  struct batadv_tt_global_entry,
1133                                                  common);
1134
1135                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1136                                 continue;
1137
1138                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1139                                    "Deleting global tt entry (%pM): %s\n",
1140                                    tt_global->common.addr, msg);
1141
1142                         hlist_del_rcu(node);
1143
1144                         batadv_tt_global_entry_free_ref(tt_global);
1145                 }
1146                 spin_unlock_bh(list_lock);
1147         }
1148 }
1149
1150 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1151 {
1152         struct batadv_hashtable *hash;
1153         spinlock_t *list_lock; /* protects write access to the hash lists */
1154         struct batadv_tt_common_entry *tt_common_entry;
1155         struct batadv_tt_global_entry *tt_global;
1156         struct hlist_node *node, *node_tmp;
1157         struct hlist_head *head;
1158         uint32_t i;
1159
1160         if (!bat_priv->tt.global_hash)
1161                 return;
1162
1163         hash = bat_priv->tt.global_hash;
1164
1165         for (i = 0; i < hash->size; i++) {
1166                 head = &hash->table[i];
1167                 list_lock = &hash->list_locks[i];
1168
1169                 spin_lock_bh(list_lock);
1170                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
1171                                           head, hash_entry) {
1172                         hlist_del_rcu(node);
1173                         tt_global = container_of(tt_common_entry,
1174                                                  struct batadv_tt_global_entry,
1175                                                  common);
1176                         batadv_tt_global_entry_free_ref(tt_global);
1177                 }
1178                 spin_unlock_bh(list_lock);
1179         }
1180
1181         batadv_hash_destroy(hash);
1182
1183         bat_priv->tt.global_hash = NULL;
1184 }
1185
1186 static bool
1187 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1188                        struct batadv_tt_global_entry *tt_global_entry)
1189 {
1190         bool ret = false;
1191
1192         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1193             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1194                 ret = true;
1195
1196         return ret;
1197 }
1198
1199 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1200                                                   const uint8_t *src,
1201                                                   const uint8_t *addr)
1202 {
1203         struct batadv_tt_local_entry *tt_local_entry = NULL;
1204         struct batadv_tt_global_entry *tt_global_entry = NULL;
1205         struct batadv_orig_node *orig_node = NULL;
1206         struct batadv_neigh_node *router = NULL;
1207         struct hlist_head *head;
1208         struct hlist_node *node;
1209         struct batadv_tt_orig_list_entry *orig_entry;
1210         int best_tq;
1211
1212         if (src && atomic_read(&bat_priv->ap_isolation)) {
1213                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src);
1214                 if (!tt_local_entry)
1215                         goto out;
1216         }
1217
1218         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
1219         if (!tt_global_entry)
1220                 goto out;
1221
1222         /* check whether the clients should not communicate due to AP
1223          * isolation
1224          */
1225         if (tt_local_entry &&
1226             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1227                 goto out;
1228
1229         best_tq = 0;
1230
1231         rcu_read_lock();
1232         head = &tt_global_entry->orig_list;
1233         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
1234                 router = batadv_orig_node_get_router(orig_entry->orig_node);
1235                 if (!router)
1236                         continue;
1237
1238                 if (router->tq_avg > best_tq) {
1239                         orig_node = orig_entry->orig_node;
1240                         best_tq = router->tq_avg;
1241                 }
1242                 batadv_neigh_node_free_ref(router);
1243         }
1244         /* found anything? */
1245         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1246                 orig_node = NULL;
1247         rcu_read_unlock();
1248 out:
1249         if (tt_global_entry)
1250                 batadv_tt_global_entry_free_ref(tt_global_entry);
1251         if (tt_local_entry)
1252                 batadv_tt_local_entry_free_ref(tt_local_entry);
1253
1254         return orig_node;
1255 }
1256
1257 /* Calculates the checksum of the local table of a given orig_node */
1258 static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1259                                      struct batadv_orig_node *orig_node)
1260 {
1261         uint16_t total = 0, total_one;
1262         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1263         struct batadv_tt_common_entry *tt_common;
1264         struct batadv_tt_global_entry *tt_global;
1265         struct hlist_node *node;
1266         struct hlist_head *head;
1267         uint32_t i;
1268         int j;
1269
1270         for (i = 0; i < hash->size; i++) {
1271                 head = &hash->table[i];
1272
1273                 rcu_read_lock();
1274                 hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) {
1275                         tt_global = container_of(tt_common,
1276                                                  struct batadv_tt_global_entry,
1277                                                  common);
1278                         /* Roaming clients are in the global table for
1279                          * consistency only. They don't have to be
1280                          * taken into account while computing the
1281                          * global crc
1282                          */
1283                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
1284                                 continue;
1285                         /* Temporary clients have not been announced yet, so
1286                          * they have to be skipped while computing the global
1287                          * crc
1288                          */
1289                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
1290                                 continue;
1291
1292                         /* find out if this global entry is announced by this
1293                          * originator
1294                          */
1295                         if (!batadv_tt_global_entry_has_orig(tt_global,
1296                                                              orig_node))
1297                                 continue;
1298
1299                         total_one = 0;
1300                         for (j = 0; j < ETH_ALEN; j++)
1301                                 total_one = crc16_byte(total_one,
1302                                                        tt_common->addr[j]);
1303                         total ^= total_one;
1304                 }
1305                 rcu_read_unlock();
1306         }
1307
1308         return total;
1309 }
1310
1311 /* Calculates the checksum of the local table */
1312 static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv)
1313 {
1314         uint16_t total = 0, total_one;
1315         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1316         struct batadv_tt_common_entry *tt_common;
1317         struct hlist_node *node;
1318         struct hlist_head *head;
1319         uint32_t i;
1320         int j;
1321
1322         for (i = 0; i < hash->size; i++) {
1323                 head = &hash->table[i];
1324
1325                 rcu_read_lock();
1326                 hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) {
1327                         /* not yet committed clients have not to be taken into
1328                          * account while computing the CRC
1329                          */
1330                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
1331                                 continue;
1332                         total_one = 0;
1333                         for (j = 0; j < ETH_ALEN; j++)
1334                                 total_one = crc16_byte(total_one,
1335                                                        tt_common->addr[j]);
1336                         total ^= total_one;
1337                 }
1338                 rcu_read_unlock();
1339         }
1340
1341         return total;
1342 }
1343
1344 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
1345 {
1346         struct batadv_tt_req_node *node, *safe;
1347
1348         spin_lock_bh(&bat_priv->tt.req_list_lock);
1349
1350         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
1351                 list_del(&node->list);
1352                 kfree(node);
1353         }
1354
1355         spin_unlock_bh(&bat_priv->tt.req_list_lock);
1356 }
1357
1358 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
1359                                        struct batadv_orig_node *orig_node,
1360                                        const unsigned char *tt_buff,
1361                                        uint8_t tt_num_changes)
1362 {
1363         uint16_t tt_buff_len = batadv_tt_len(tt_num_changes);
1364
1365         /* Replace the old buffer only if I received something in the
1366          * last OGM (the OGM could carry no changes)
1367          */
1368         spin_lock_bh(&orig_node->tt_buff_lock);
1369         if (tt_buff_len > 0) {
1370                 kfree(orig_node->tt_buff);
1371                 orig_node->tt_buff_len = 0;
1372                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
1373                 if (orig_node->tt_buff) {
1374                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
1375                         orig_node->tt_buff_len = tt_buff_len;
1376                 }
1377         }
1378         spin_unlock_bh(&orig_node->tt_buff_lock);
1379 }
1380
1381 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
1382 {
1383         struct batadv_tt_req_node *node, *safe;
1384
1385         spin_lock_bh(&bat_priv->tt.req_list_lock);
1386         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
1387                 if (batadv_has_timed_out(node->issued_at,
1388                                          BATADV_TT_REQUEST_TIMEOUT)) {
1389                         list_del(&node->list);
1390                         kfree(node);
1391                 }
1392         }
1393         spin_unlock_bh(&bat_priv->tt.req_list_lock);
1394 }
1395
1396 /* returns the pointer to the new tt_req_node struct if no request
1397  * has already been issued for this orig_node, NULL otherwise
1398  */
1399 static struct batadv_tt_req_node *
1400 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
1401                        struct batadv_orig_node *orig_node)
1402 {
1403         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
1404
1405         spin_lock_bh(&bat_priv->tt.req_list_lock);
1406         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
1407                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
1408                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
1409                                           BATADV_TT_REQUEST_TIMEOUT))
1410                         goto unlock;
1411         }
1412
1413         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1414         if (!tt_req_node)
1415                 goto unlock;
1416
1417         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1418         tt_req_node->issued_at = jiffies;
1419
1420         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
1421 unlock:
1422         spin_unlock_bh(&bat_priv->tt.req_list_lock);
1423         return tt_req_node;
1424 }
1425
1426 /* data_ptr is useless here, but has to be kept to respect the prototype */
1427 static int batadv_tt_local_valid_entry(const void *entry_ptr,
1428                                        const void *data_ptr)
1429 {
1430         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
1431
1432         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
1433                 return 0;
1434         return 1;
1435 }
1436
1437 static int batadv_tt_global_valid(const void *entry_ptr,
1438                                   const void *data_ptr)
1439 {
1440         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
1441         const struct batadv_tt_global_entry *tt_global_entry;
1442         const struct batadv_orig_node *orig_node = data_ptr;
1443
1444         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
1445             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
1446                 return 0;
1447
1448         tt_global_entry = container_of(tt_common_entry,
1449                                        struct batadv_tt_global_entry,
1450                                        common);
1451
1452         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
1453 }
1454
1455 static struct sk_buff *
1456 batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1457                               struct batadv_hashtable *hash,
1458                               struct batadv_hard_iface *primary_if,
1459                               int (*valid_cb)(const void *, const void *),
1460                               void *cb_data)
1461 {
1462         struct batadv_tt_common_entry *tt_common_entry;
1463         struct batadv_tt_query_packet *tt_response;
1464         struct batadv_tt_change *tt_change;
1465         struct hlist_node *node;
1466         struct hlist_head *head;
1467         struct sk_buff *skb = NULL;
1468         uint16_t tt_tot, tt_count;
1469         ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet);
1470         uint32_t i;
1471         size_t len;
1472
1473         if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1474                 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1475                 tt_len -= tt_len % sizeof(struct batadv_tt_change);
1476         }
1477         tt_tot = tt_len / sizeof(struct batadv_tt_change);
1478
1479         len = tt_query_size + tt_len;
1480         skb = dev_alloc_skb(len + ETH_HLEN);
1481         if (!skb)
1482                 goto out;
1483
1484         skb_reserve(skb, ETH_HLEN);
1485         tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len);
1486         tt_response->ttvn = ttvn;
1487
1488         tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size);
1489         tt_count = 0;
1490
1491         rcu_read_lock();
1492         for (i = 0; i < hash->size; i++) {
1493                 head = &hash->table[i];
1494
1495                 hlist_for_each_entry_rcu(tt_common_entry, node,
1496                                          head, hash_entry) {
1497                         if (tt_count == tt_tot)
1498                                 break;
1499
1500                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
1501                                 continue;
1502
1503                         memcpy(tt_change->addr, tt_common_entry->addr,
1504                                ETH_ALEN);
1505                         tt_change->flags = tt_common_entry->flags;
1506
1507                         tt_count++;
1508                         tt_change++;
1509                 }
1510         }
1511         rcu_read_unlock();
1512
1513         /* store in the message the number of entries we have successfully
1514          * copied
1515          */
1516         tt_response->tt_data = htons(tt_count);
1517
1518 out:
1519         return skb;
1520 }
1521
1522 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
1523                                   struct batadv_orig_node *dst_orig_node,
1524                                   uint8_t ttvn, uint16_t tt_crc,
1525                                   bool full_table)
1526 {
1527         struct sk_buff *skb = NULL;
1528         struct batadv_tt_query_packet *tt_request;
1529         struct batadv_neigh_node *neigh_node = NULL;
1530         struct batadv_hard_iface *primary_if;
1531         struct batadv_tt_req_node *tt_req_node = NULL;
1532         int ret = 1;
1533         size_t tt_req_len;
1534
1535         primary_if = batadv_primary_if_get_selected(bat_priv);
1536         if (!primary_if)
1537                 goto out;
1538
1539         /* The new tt_req will be issued only if I'm not waiting for a
1540          * reply from the same orig_node yet
1541          */
1542         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
1543         if (!tt_req_node)
1544                 goto out;
1545
1546         skb = dev_alloc_skb(sizeof(*tt_request) + ETH_HLEN);
1547         if (!skb)
1548                 goto out;
1549
1550         skb_reserve(skb, ETH_HLEN);
1551
1552         tt_req_len = sizeof(*tt_request);
1553         tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len);
1554
1555         tt_request->header.packet_type = BATADV_TT_QUERY;
1556         tt_request->header.version = BATADV_COMPAT_VERSION;
1557         memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1558         memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1559         tt_request->header.ttl = BATADV_TTL;
1560         tt_request->ttvn = ttvn;
1561         tt_request->tt_data = htons(tt_crc);
1562         tt_request->flags = BATADV_TT_REQUEST;
1563
1564         if (full_table)
1565                 tt_request->flags |= BATADV_TT_FULL_TABLE;
1566
1567         neigh_node = batadv_orig_node_get_router(dst_orig_node);
1568         if (!neigh_node)
1569                 goto out;
1570
1571         batadv_dbg(BATADV_DBG_TT, bat_priv,
1572                    "Sending TT_REQUEST to %pM via %pM [%c]\n",
1573                    dst_orig_node->orig, neigh_node->addr,
1574                    (full_table ? 'F' : '.'));
1575
1576         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
1577
1578         batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1579         ret = 0;
1580
1581 out:
1582         if (neigh_node)
1583                 batadv_neigh_node_free_ref(neigh_node);
1584         if (primary_if)
1585                 batadv_hardif_free_ref(primary_if);
1586         if (ret)
1587                 kfree_skb(skb);
1588         if (ret && tt_req_node) {
1589                 spin_lock_bh(&bat_priv->tt.req_list_lock);
1590                 list_del(&tt_req_node->list);
1591                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
1592                 kfree(tt_req_node);
1593         }
1594         return ret;
1595 }
1596
1597 static bool
1598 batadv_send_other_tt_response(struct batadv_priv *bat_priv,
1599                               struct batadv_tt_query_packet *tt_request)
1600 {
1601         struct batadv_orig_node *req_dst_orig_node = NULL;
1602         struct batadv_orig_node *res_dst_orig_node = NULL;
1603         struct batadv_neigh_node *neigh_node = NULL;
1604         struct batadv_hard_iface *primary_if = NULL;
1605         uint8_t orig_ttvn, req_ttvn, ttvn;
1606         int ret = false;
1607         unsigned char *tt_buff;
1608         bool full_table;
1609         uint16_t tt_len, tt_tot;
1610         struct sk_buff *skb = NULL;
1611         struct batadv_tt_query_packet *tt_response;
1612         uint8_t *packet_pos;
1613         size_t len;
1614
1615         batadv_dbg(BATADV_DBG_TT, bat_priv,
1616                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1617                    tt_request->src, tt_request->ttvn, tt_request->dst,
1618                    (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1619
1620         /* Let's get the orig node of the REAL destination */
1621         req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst);
1622         if (!req_dst_orig_node)
1623                 goto out;
1624
1625         res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
1626         if (!res_dst_orig_node)
1627                 goto out;
1628
1629         neigh_node = batadv_orig_node_get_router(res_dst_orig_node);
1630         if (!neigh_node)
1631                 goto out;
1632
1633         primary_if = batadv_primary_if_get_selected(bat_priv);
1634         if (!primary_if)
1635                 goto out;
1636
1637         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1638         req_ttvn = tt_request->ttvn;
1639
1640         /* I don't have the requested data */
1641         if (orig_ttvn != req_ttvn ||
1642             tt_request->tt_data != htons(req_dst_orig_node->tt_crc))
1643                 goto out;
1644
1645         /* If the full table has been explicitly requested */
1646         if (tt_request->flags & BATADV_TT_FULL_TABLE ||
1647             !req_dst_orig_node->tt_buff)
1648                 full_table = true;
1649         else
1650                 full_table = false;
1651
1652         /* In this version, fragmentation is not implemented, then
1653          * I'll send only one packet with as much TT entries as I can
1654          */
1655         if (!full_table) {
1656                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1657                 tt_len = req_dst_orig_node->tt_buff_len;
1658                 tt_tot = tt_len / sizeof(struct batadv_tt_change);
1659
1660                 len = sizeof(*tt_response) + tt_len;
1661                 skb = dev_alloc_skb(len + ETH_HLEN);
1662                 if (!skb)
1663                         goto unlock;
1664
1665                 skb_reserve(skb, ETH_HLEN);
1666                 packet_pos = skb_put(skb, len);
1667                 tt_response = (struct batadv_tt_query_packet *)packet_pos;
1668                 tt_response->ttvn = req_ttvn;
1669                 tt_response->tt_data = htons(tt_tot);
1670
1671                 tt_buff = skb->data + sizeof(*tt_response);
1672                 /* Copy the last orig_node's OGM buffer */
1673                 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1674                        req_dst_orig_node->tt_buff_len);
1675
1676                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1677         } else {
1678                 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size);
1679                 tt_len *= sizeof(struct batadv_tt_change);
1680                 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1681
1682                 skb = batadv_tt_response_fill_table(tt_len, ttvn,
1683                                                     bat_priv->tt.global_hash,
1684                                                     primary_if,
1685                                                     batadv_tt_global_valid,
1686                                                     req_dst_orig_node);
1687                 if (!skb)
1688                         goto out;
1689
1690                 tt_response = (struct batadv_tt_query_packet *)skb->data;
1691         }
1692
1693         tt_response->header.packet_type = BATADV_TT_QUERY;
1694         tt_response->header.version = BATADV_COMPAT_VERSION;
1695         tt_response->header.ttl = BATADV_TTL;
1696         memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1697         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1698         tt_response->flags = BATADV_TT_RESPONSE;
1699
1700         if (full_table)
1701                 tt_response->flags |= BATADV_TT_FULL_TABLE;
1702
1703         batadv_dbg(BATADV_DBG_TT, bat_priv,
1704                    "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1705                    res_dst_orig_node->orig, neigh_node->addr,
1706                    req_dst_orig_node->orig, req_ttvn);
1707
1708         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
1709
1710         batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1711         ret = true;
1712         goto out;
1713
1714 unlock:
1715         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1716
1717 out:
1718         if (res_dst_orig_node)
1719                 batadv_orig_node_free_ref(res_dst_orig_node);
1720         if (req_dst_orig_node)
1721                 batadv_orig_node_free_ref(req_dst_orig_node);
1722         if (neigh_node)
1723                 batadv_neigh_node_free_ref(neigh_node);
1724         if (primary_if)
1725                 batadv_hardif_free_ref(primary_if);
1726         if (!ret)
1727                 kfree_skb(skb);
1728         return ret;
1729
1730 }
1731
1732 static bool
1733 batadv_send_my_tt_response(struct batadv_priv *bat_priv,
1734                            struct batadv_tt_query_packet *tt_request)
1735 {
1736         struct batadv_orig_node *orig_node = NULL;
1737         struct batadv_neigh_node *neigh_node = NULL;
1738         struct batadv_hard_iface *primary_if = NULL;
1739         uint8_t my_ttvn, req_ttvn, ttvn;
1740         int ret = false;
1741         unsigned char *tt_buff;
1742         bool full_table;
1743         uint16_t tt_len, tt_tot;
1744         struct sk_buff *skb = NULL;
1745         struct batadv_tt_query_packet *tt_response;
1746         uint8_t *packet_pos;
1747         size_t len;
1748
1749         batadv_dbg(BATADV_DBG_TT, bat_priv,
1750                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1751                    tt_request->src, tt_request->ttvn,
1752                    (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1753
1754
1755         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
1756         req_ttvn = tt_request->ttvn;
1757
1758         orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
1759         if (!orig_node)
1760                 goto out;
1761
1762         neigh_node = batadv_orig_node_get_router(orig_node);
1763         if (!neigh_node)
1764                 goto out;
1765
1766         primary_if = batadv_primary_if_get_selected(bat_priv);
1767         if (!primary_if)
1768                 goto out;
1769
1770         /* If the full table has been explicitly requested or the gap
1771          * is too big send the whole local translation table
1772          */
1773         if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
1774             !bat_priv->tt.last_changeset)
1775                 full_table = true;
1776         else
1777                 full_table = false;
1778
1779         /* In this version, fragmentation is not implemented, then
1780          * I'll send only one packet with as much TT entries as I can
1781          */
1782         if (!full_table) {
1783                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
1784                 tt_len = bat_priv->tt.last_changeset_len;
1785                 tt_tot = tt_len / sizeof(struct batadv_tt_change);
1786
1787                 len = sizeof(*tt_response) + tt_len;
1788                 skb = dev_alloc_skb(len + ETH_HLEN);
1789                 if (!skb)
1790                         goto unlock;
1791
1792                 skb_reserve(skb, ETH_HLEN);
1793                 packet_pos = skb_put(skb, len);
1794                 tt_response = (struct batadv_tt_query_packet *)packet_pos;
1795                 tt_response->ttvn = req_ttvn;
1796                 tt_response->tt_data = htons(tt_tot);
1797
1798                 tt_buff = skb->data + sizeof(*tt_response);
1799                 memcpy(tt_buff, bat_priv->tt.last_changeset,
1800                        bat_priv->tt.last_changeset_len);
1801                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1802         } else {
1803                 tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num);
1804                 tt_len *= sizeof(struct batadv_tt_change);
1805                 ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
1806
1807                 skb = batadv_tt_response_fill_table(tt_len, ttvn,
1808                                                     bat_priv->tt.local_hash,
1809                                                     primary_if,
1810                                                     batadv_tt_local_valid_entry,
1811                                                     NULL);
1812                 if (!skb)
1813                         goto out;
1814
1815                 tt_response = (struct batadv_tt_query_packet *)skb->data;
1816         }
1817
1818         tt_response->header.packet_type = BATADV_TT_QUERY;
1819         tt_response->header.version = BATADV_COMPAT_VERSION;
1820         tt_response->header.ttl = BATADV_TTL;
1821         memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1822         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1823         tt_response->flags = BATADV_TT_RESPONSE;
1824
1825         if (full_table)
1826                 tt_response->flags |= BATADV_TT_FULL_TABLE;
1827
1828         batadv_dbg(BATADV_DBG_TT, bat_priv,
1829                    "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1830                    orig_node->orig, neigh_node->addr,
1831                    (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1832
1833         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
1834
1835         batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1836         ret = true;
1837         goto out;
1838
1839 unlock:
1840         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1841 out:
1842         if (orig_node)
1843                 batadv_orig_node_free_ref(orig_node);
1844         if (neigh_node)
1845                 batadv_neigh_node_free_ref(neigh_node);
1846         if (primary_if)
1847                 batadv_hardif_free_ref(primary_if);
1848         if (!ret)
1849                 kfree_skb(skb);
1850         /* This packet was for me, so it doesn't need to be re-routed */
1851         return true;
1852 }
1853
1854 bool batadv_send_tt_response(struct batadv_priv *bat_priv,
1855                              struct batadv_tt_query_packet *tt_request)
1856 {
1857         if (batadv_is_my_mac(tt_request->dst)) {
1858                 /* don't answer backbone gws! */
1859                 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src))
1860                         return true;
1861
1862                 return batadv_send_my_tt_response(bat_priv, tt_request);
1863         } else {
1864                 return batadv_send_other_tt_response(bat_priv, tt_request);
1865         }
1866 }
1867
1868 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
1869                                       struct batadv_orig_node *orig_node,
1870                                       struct batadv_tt_change *tt_change,
1871                                       uint16_t tt_num_changes, uint8_t ttvn)
1872 {
1873         int i;
1874         int roams;
1875
1876         for (i = 0; i < tt_num_changes; i++) {
1877                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
1878                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
1879                         batadv_tt_global_del(bat_priv, orig_node,
1880                                              (tt_change + i)->addr,
1881                                              "tt removed by changes",
1882                                              roams);
1883                 } else {
1884                         if (!batadv_tt_global_add(bat_priv, orig_node,
1885                                                   (tt_change + i)->addr,
1886                                                   (tt_change + i)->flags, ttvn))
1887                                 /* In case of problem while storing a
1888                                  * global_entry, we stop the updating
1889                                  * procedure without committing the
1890                                  * ttvn change. This will avoid to send
1891                                  * corrupted data on tt_request
1892                                  */
1893                                 return;
1894                 }
1895         }
1896         orig_node->tt_initialised = true;
1897 }
1898
1899 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
1900                                   struct batadv_tt_query_packet *tt_response)
1901 {
1902         struct batadv_orig_node *orig_node = NULL;
1903
1904         orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
1905         if (!orig_node)
1906                 goto out;
1907
1908         /* Purge the old table first.. */
1909         batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table");
1910
1911         _batadv_tt_update_changes(bat_priv, orig_node,
1912                                   (struct batadv_tt_change *)(tt_response + 1),
1913                                   ntohs(tt_response->tt_data),
1914                                   tt_response->ttvn);
1915
1916         spin_lock_bh(&orig_node->tt_buff_lock);
1917         kfree(orig_node->tt_buff);
1918         orig_node->tt_buff_len = 0;
1919         orig_node->tt_buff = NULL;
1920         spin_unlock_bh(&orig_node->tt_buff_lock);
1921
1922         atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1923
1924 out:
1925         if (orig_node)
1926                 batadv_orig_node_free_ref(orig_node);
1927 }
1928
1929 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
1930                                      struct batadv_orig_node *orig_node,
1931                                      uint16_t tt_num_changes, uint8_t ttvn,
1932                                      struct batadv_tt_change *tt_change)
1933 {
1934         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
1935                                   tt_num_changes, ttvn);
1936
1937         batadv_tt_save_orig_buffer(bat_priv, orig_node,
1938                                    (unsigned char *)tt_change, tt_num_changes);
1939         atomic_set(&orig_node->last_ttvn, ttvn);
1940 }
1941
1942 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr)
1943 {
1944         struct batadv_tt_local_entry *tt_local_entry = NULL;
1945         bool ret = false;
1946
1947         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
1948         if (!tt_local_entry)
1949                 goto out;
1950         /* Check if the client has been logically deleted (but is kept for
1951          * consistency purpose)
1952          */
1953         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1954                 goto out;
1955         ret = true;
1956 out:
1957         if (tt_local_entry)
1958                 batadv_tt_local_entry_free_ref(tt_local_entry);
1959         return ret;
1960 }
1961
1962 void batadv_handle_tt_response(struct batadv_priv *bat_priv,
1963                                struct batadv_tt_query_packet *tt_response)
1964 {
1965         struct batadv_tt_req_node *node, *safe;
1966         struct batadv_orig_node *orig_node = NULL;
1967         struct batadv_tt_change *tt_change;
1968
1969         batadv_dbg(BATADV_DBG_TT, bat_priv,
1970                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
1971                    tt_response->src, tt_response->ttvn,
1972                    ntohs(tt_response->tt_data),
1973                    (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1974
1975         /* we should have never asked a backbone gw */
1976         if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src))
1977                 goto out;
1978
1979         orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
1980         if (!orig_node)
1981                 goto out;
1982
1983         if (tt_response->flags & BATADV_TT_FULL_TABLE) {
1984                 batadv_tt_fill_gtable(bat_priv, tt_response);
1985         } else {
1986                 tt_change = (struct batadv_tt_change *)(tt_response + 1);
1987                 batadv_tt_update_changes(bat_priv, orig_node,
1988                                          ntohs(tt_response->tt_data),
1989                                          tt_response->ttvn, tt_change);
1990         }
1991
1992         /* Delete the tt_req_node from pending tt_requests list */
1993         spin_lock_bh(&bat_priv->tt.req_list_lock);
1994         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
1995                 if (!batadv_compare_eth(node->addr, tt_response->src))
1996                         continue;
1997                 list_del(&node->list);
1998                 kfree(node);
1999         }
2000         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2001
2002         /* Recalculate the CRC for this orig_node and store it */
2003         orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
2004         /* Roaming phase is over: tables are in sync again. I can
2005          * unset the flag
2006          */
2007         orig_node->tt_poss_change = false;
2008 out:
2009         if (orig_node)
2010                 batadv_orig_node_free_ref(orig_node);
2011 }
2012
2013 int batadv_tt_init(struct batadv_priv *bat_priv)
2014 {
2015         int ret;
2016
2017         ret = batadv_tt_local_init(bat_priv);
2018         if (ret < 0)
2019                 return ret;
2020
2021         ret = batadv_tt_global_init(bat_priv);
2022         if (ret < 0)
2023                 return ret;
2024
2025         batadv_tt_start_timer(bat_priv);
2026
2027         return 1;
2028 }
2029
2030 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2031 {
2032         struct batadv_tt_roam_node *node, *safe;
2033
2034         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2035
2036         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2037                 list_del(&node->list);
2038                 kfree(node);
2039         }
2040
2041         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2042 }
2043
2044 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2045 {
2046         struct batadv_tt_roam_node *node, *safe;
2047
2048         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2049         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2050                 if (!batadv_has_timed_out(node->first_time,
2051                                           BATADV_ROAMING_MAX_TIME))
2052                         continue;
2053
2054                 list_del(&node->list);
2055                 kfree(node);
2056         }
2057         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2058 }
2059
2060 /* This function checks whether the client already reached the
2061  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2062  * will not be sent.
2063  *
2064  * returns true if the ROAMING_ADV can be sent, false otherwise
2065  */
2066 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2067                                        uint8_t *client)
2068 {
2069         struct batadv_tt_roam_node *tt_roam_node;
2070         bool ret = false;
2071
2072         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2073         /* The new tt_req will be issued only if I'm not waiting for a
2074          * reply from the same orig_node yet
2075          */
2076         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2077                 if (!batadv_compare_eth(tt_roam_node->addr, client))
2078                         continue;
2079
2080                 if (batadv_has_timed_out(tt_roam_node->first_time,
2081                                          BATADV_ROAMING_MAX_TIME))
2082                         continue;
2083
2084                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2085                         /* Sorry, you roamed too many times! */
2086                         goto unlock;
2087                 ret = true;
2088                 break;
2089         }
2090
2091         if (!ret) {
2092                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2093                 if (!tt_roam_node)
2094                         goto unlock;
2095
2096                 tt_roam_node->first_time = jiffies;
2097                 atomic_set(&tt_roam_node->counter,
2098                            BATADV_ROAMING_MAX_COUNT - 1);
2099                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2100
2101                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2102                 ret = true;
2103         }
2104
2105 unlock:
2106         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2107         return ret;
2108 }
2109
2110 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2111                                  struct batadv_orig_node *orig_node)
2112 {
2113         struct batadv_neigh_node *neigh_node = NULL;
2114         struct sk_buff *skb = NULL;
2115         struct batadv_roam_adv_packet *roam_adv_packet;
2116         int ret = 1;
2117         struct batadv_hard_iface *primary_if;
2118         size_t len = sizeof(*roam_adv_packet);
2119
2120         /* before going on we have to check whether the client has
2121          * already roamed to us too many times
2122          */
2123         if (!batadv_tt_check_roam_count(bat_priv, client))
2124                 goto out;
2125
2126         skb = dev_alloc_skb(sizeof(*roam_adv_packet) + ETH_HLEN);
2127         if (!skb)
2128                 goto out;
2129
2130         skb_reserve(skb, ETH_HLEN);
2131
2132         roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len);
2133
2134         roam_adv_packet->header.packet_type = BATADV_ROAM_ADV;
2135         roam_adv_packet->header.version = BATADV_COMPAT_VERSION;
2136         roam_adv_packet->header.ttl = BATADV_TTL;
2137         roam_adv_packet->reserved = 0;
2138         primary_if = batadv_primary_if_get_selected(bat_priv);
2139         if (!primary_if)
2140                 goto out;
2141         memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
2142         batadv_hardif_free_ref(primary_if);
2143         memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
2144         memcpy(roam_adv_packet->client, client, ETH_ALEN);
2145
2146         neigh_node = batadv_orig_node_get_router(orig_node);
2147         if (!neigh_node)
2148                 goto out;
2149
2150         batadv_dbg(BATADV_DBG_TT, bat_priv,
2151                    "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
2152                    orig_node->orig, client, neigh_node->addr);
2153
2154         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2155
2156         batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
2157         ret = 0;
2158
2159 out:
2160         if (neigh_node)
2161                 batadv_neigh_node_free_ref(neigh_node);
2162         if (ret)
2163                 kfree_skb(skb);
2164         return;
2165 }
2166
2167 static void batadv_tt_purge(struct work_struct *work)
2168 {
2169         struct delayed_work *delayed_work;
2170         struct batadv_priv_tt *priv_tt;
2171         struct batadv_priv *bat_priv;
2172
2173         delayed_work = container_of(work, struct delayed_work, work);
2174         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2175         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
2176
2177         batadv_tt_local_purge(bat_priv);
2178         batadv_tt_global_purge(bat_priv);
2179         batadv_tt_req_purge(bat_priv);
2180         batadv_tt_roam_purge(bat_priv);
2181
2182         batadv_tt_start_timer(bat_priv);
2183 }
2184
2185 void batadv_tt_free(struct batadv_priv *bat_priv)
2186 {
2187         cancel_delayed_work_sync(&bat_priv->tt.work);
2188
2189         batadv_tt_local_table_free(bat_priv);
2190         batadv_tt_global_table_free(bat_priv);
2191         batadv_tt_req_list_free(bat_priv);
2192         batadv_tt_changes_list_free(bat_priv);
2193         batadv_tt_roam_list_free(bat_priv);
2194
2195         kfree(bat_priv->tt.last_changeset);
2196 }
2197
2198 /* This function will enable or disable the specified flags for all the entries
2199  * in the given hash table and returns the number of modified entries
2200  */
2201 static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash,
2202                                     uint16_t flags, bool enable)
2203 {
2204         uint32_t i;
2205         uint16_t changed_num = 0;
2206         struct hlist_head *head;
2207         struct hlist_node *node;
2208         struct batadv_tt_common_entry *tt_common_entry;
2209
2210         if (!hash)
2211                 goto out;
2212
2213         for (i = 0; i < hash->size; i++) {
2214                 head = &hash->table[i];
2215
2216                 rcu_read_lock();
2217                 hlist_for_each_entry_rcu(tt_common_entry, node,
2218                                          head, hash_entry) {
2219                         if (enable) {
2220                                 if ((tt_common_entry->flags & flags) == flags)
2221                                         continue;
2222                                 tt_common_entry->flags |= flags;
2223                         } else {
2224                                 if (!(tt_common_entry->flags & flags))
2225                                         continue;
2226                                 tt_common_entry->flags &= ~flags;
2227                         }
2228                         changed_num++;
2229                 }
2230                 rcu_read_unlock();
2231         }
2232 out:
2233         return changed_num;
2234 }
2235
2236 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
2237 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
2238 {
2239         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2240         struct batadv_tt_common_entry *tt_common;
2241         struct batadv_tt_local_entry *tt_local;
2242         struct hlist_node *node, *node_tmp;
2243         struct hlist_head *head;
2244         spinlock_t *list_lock; /* protects write access to the hash lists */
2245         uint32_t i;
2246
2247         if (!hash)
2248                 return;
2249
2250         for (i = 0; i < hash->size; i++) {
2251                 head = &hash->table[i];
2252                 list_lock = &hash->list_locks[i];
2253
2254                 spin_lock_bh(list_lock);
2255                 hlist_for_each_entry_safe(tt_common, node, node_tmp, head,
2256                                           hash_entry) {
2257                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
2258                                 continue;
2259
2260                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2261                                    "Deleting local tt entry (%pM): pending\n",
2262                                    tt_common->addr);
2263
2264                         atomic_dec(&bat_priv->tt.local_entry_num);
2265                         hlist_del_rcu(node);
2266                         tt_local = container_of(tt_common,
2267                                                 struct batadv_tt_local_entry,
2268                                                 common);
2269                         batadv_tt_local_entry_free_ref(tt_local);
2270                 }
2271                 spin_unlock_bh(list_lock);
2272         }
2273
2274 }
2275
2276 static int batadv_tt_commit_changes(struct batadv_priv *bat_priv,
2277                                     unsigned char **packet_buff,
2278                                     int *packet_buff_len, int packet_min_len)
2279 {
2280         uint16_t changed_num = 0;
2281
2282         if (atomic_read(&bat_priv->tt.local_changes) < 1)
2283                 return -ENOENT;
2284
2285         changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash,
2286                                           BATADV_TT_CLIENT_NEW, false);
2287
2288         /* all reset entries have to be counted as local entries */
2289         atomic_add(changed_num, &bat_priv->tt.local_entry_num);
2290         batadv_tt_local_purge_pending_clients(bat_priv);
2291         bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv);
2292
2293         /* Increment the TTVN only once per OGM interval */
2294         atomic_inc(&bat_priv->tt.vn);
2295         batadv_dbg(BATADV_DBG_TT, bat_priv,
2296                    "Local changes committed, updating to ttvn %u\n",
2297                    (uint8_t)atomic_read(&bat_priv->tt.vn));
2298         bat_priv->tt.poss_change = false;
2299
2300         /* reset the sending counter */
2301         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
2302
2303         return batadv_tt_changes_fill_buff(bat_priv, packet_buff,
2304                                            packet_buff_len, packet_min_len);
2305 }
2306
2307 /* when calling this function (hard_iface == primary_if) has to be true */
2308 int batadv_tt_append_diff(struct batadv_priv *bat_priv,
2309                           unsigned char **packet_buff, int *packet_buff_len,
2310                           int packet_min_len)
2311 {
2312         int tt_num_changes;
2313
2314         /* if at least one change happened */
2315         tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff,
2316                                                   packet_buff_len,
2317                                                   packet_min_len);
2318
2319         /* if the changes have been sent often enough */
2320         if ((tt_num_changes < 0) &&
2321             (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))) {
2322                 batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
2323                                               packet_min_len, packet_min_len);
2324                 tt_num_changes = 0;
2325         }
2326
2327         return tt_num_changes;
2328 }
2329
2330 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
2331                            uint8_t *dst)
2332 {
2333         struct batadv_tt_local_entry *tt_local_entry = NULL;
2334         struct batadv_tt_global_entry *tt_global_entry = NULL;
2335         bool ret = false;
2336
2337         if (!atomic_read(&bat_priv->ap_isolation))
2338                 goto out;
2339
2340         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst);
2341         if (!tt_local_entry)
2342                 goto out;
2343
2344         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src);
2345         if (!tt_global_entry)
2346                 goto out;
2347
2348         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2349                 goto out;
2350
2351         ret = true;
2352
2353 out:
2354         if (tt_global_entry)
2355                 batadv_tt_global_entry_free_ref(tt_global_entry);
2356         if (tt_local_entry)
2357                 batadv_tt_local_entry_free_ref(tt_local_entry);
2358         return ret;
2359 }
2360
2361 void batadv_tt_update_orig(struct batadv_priv *bat_priv,
2362                            struct batadv_orig_node *orig_node,
2363                            const unsigned char *tt_buff, uint8_t tt_num_changes,
2364                            uint8_t ttvn, uint16_t tt_crc)
2365 {
2366         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
2367         bool full_table = true;
2368         struct batadv_tt_change *tt_change;
2369
2370         /* don't care about a backbone gateways updates. */
2371         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
2372                 return;
2373
2374         /* orig table not initialised AND first diff is in the OGM OR the ttvn
2375          * increased by one -> we can apply the attached changes
2376          */
2377         if ((!orig_node->tt_initialised && ttvn == 1) ||
2378             ttvn - orig_ttvn == 1) {
2379                 /* the OGM could not contain the changes due to their size or
2380                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
2381                  * times.
2382                  * In this case send a tt request
2383                  */
2384                 if (!tt_num_changes) {
2385                         full_table = false;
2386                         goto request_table;
2387                 }
2388
2389                 tt_change = (struct batadv_tt_change *)tt_buff;
2390                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
2391                                          ttvn, tt_change);
2392
2393                 /* Even if we received the precomputed crc with the OGM, we
2394                  * prefer to recompute it to spot any possible inconsistency
2395                  * in the global table
2396                  */
2397                 orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
2398
2399                 /* The ttvn alone is not enough to guarantee consistency
2400                  * because a single value could represent different states
2401                  * (due to the wrap around). Thus a node has to check whether
2402                  * the resulting table (after applying the changes) is still
2403                  * consistent or not. E.g. a node could disconnect while its
2404                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2405                  * checking the CRC value is mandatory to detect the
2406                  * inconsistency
2407                  */
2408                 if (orig_node->tt_crc != tt_crc)
2409                         goto request_table;
2410
2411                 /* Roaming phase is over: tables are in sync again. I can
2412                  * unset the flag
2413                  */
2414                 orig_node->tt_poss_change = false;
2415         } else {
2416                 /* if we missed more than one change or our tables are not
2417                  * in sync anymore -> request fresh tt data
2418                  */
2419                 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
2420                     orig_node->tt_crc != tt_crc) {
2421 request_table:
2422                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2423                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2424                                    orig_node->orig, ttvn, orig_ttvn, tt_crc,
2425                                    orig_node->tt_crc, tt_num_changes);
2426                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
2427                                                tt_crc, full_table);
2428                         return;
2429                 }
2430         }
2431 }
2432
2433 /* returns true whether we know that the client has moved from its old
2434  * originator to another one. This entry is kept is still kept for consistency
2435  * purposes
2436  */
2437 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
2438                                         uint8_t *addr)
2439 {
2440         struct batadv_tt_global_entry *tt_global_entry;
2441         bool ret = false;
2442
2443         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
2444         if (!tt_global_entry)
2445                 goto out;
2446
2447         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
2448         batadv_tt_global_entry_free_ref(tt_global_entry);
2449 out:
2450         return ret;
2451 }
2452
2453 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
2454                                           struct batadv_orig_node *orig_node,
2455                                           const unsigned char *addr)
2456 {
2457         bool ret = false;
2458
2459         /* if the originator is a backbone node (meaning it belongs to the same
2460          * LAN of this node) the temporary client must not be added because to
2461          * reach such destination the node must use the LAN instead of the mesh
2462          */
2463         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
2464                 goto out;
2465
2466         if (!batadv_tt_global_add(bat_priv, orig_node, addr,
2467                                   BATADV_TT_CLIENT_TEMP,
2468                                   atomic_read(&orig_node->last_ttvn)))
2469                 goto out;
2470
2471         batadv_dbg(BATADV_DBG_TT, bat_priv,
2472                    "Added temporary global client (addr: %pM orig: %pM)\n",
2473                    addr, orig_node->orig);
2474         ret = true;
2475 out:
2476         return ret;
2477 }