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                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
 773                  * one originator left in the list and we previously received a
 774                  * delete + roaming change for this originator.
 775                  *
 776                  * We should first delete the old originator before adding the
 777                  * new one.
 778                  */
 779                 if (tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM) {
 780                         batadv_tt_global_del_orig_list(tt_global_entry);
 781                         tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 782                         tt_global_entry->roam_at = 0;
 783                 }
 784         }
 785         /* add the new orig_entry (if needed) or update it */
 786         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
 787
 788         batadv_dbg(BATADV_DBG_TT, bat_priv,
 789                    "Creating new global tt entry: %pM (via %pM)\n",
 790                    tt_global_entry->common.addr, orig_node->orig);
 791
 792 out_remove:
 793         /* remove address from local hash if present */
 794         batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr,
 795                                "global tt received",
 796                                flags & BATADV_TT_CLIENT_ROAM);
 797         ret = 1;
 798 out:
 799         if (tt_global_entry)
 800                 batadv_tt_global_entry_free_ref(tt_global_entry);
 801         return ret;
 802 }
 803
 804 /* print all orig nodes who announce the address for this global entry.
 805  * it is assumed that the caller holds rcu_read_lock();
 806  */
 807 static void
 808 batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry,
 809                              struct seq_file *seq)
 810 {
 811         struct hlist_head *head;
 812         struct hlist_node *node;
 813         struct batadv_tt_orig_list_entry *orig_entry;
 814         struct batadv_tt_common_entry *tt_common_entry;
 815         uint16_t flags;
 816         uint8_t last_ttvn;
 817
 818         tt_common_entry = &tt_global_entry->common;
 819
 820         head = &tt_global_entry->orig_list;
 821
 822         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
 823                 flags = tt_common_entry->flags;
 824                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
 825                 seq_printf(seq, " * %pM  (%3u) via %pM     (%3u)   [%c%c%c]\n",
 826                            tt_global_entry->common.addr, orig_entry->ttvn,
 827                            orig_entry->orig_node->orig, last_ttvn,
 828                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 829                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 830                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
 831         }
 832 }
 833
 834 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
 835 {
 836         struct net_device *net_dev = (struct net_device *)seq->private;
 837         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 838         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
 839         struct batadv_tt_common_entry *tt_common_entry;
 840         struct batadv_tt_global_entry *tt_global;
 841         struct batadv_hard_iface *primary_if;
 842         struct hlist_node *node;
 843         struct hlist_head *head;
 844         uint32_t i;
 845         int ret = 0;
 846
 847         primary_if = batadv_primary_if_get_selected(bat_priv);
 848         if (!primary_if) {
 849                 ret = seq_printf(seq,
 850                                  "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
 851                                  net_dev->name);
 852                 goto out;
 853         }
 854
 855         if (primary_if->if_status != BATADV_IF_ACTIVE) {
 856                 ret = seq_printf(seq,
 857                                  "BATMAN mesh %s disabled - primary interface not active\n",
 858                                  net_dev->name);
 859                 goto out;
 860         }
 861
 862         seq_printf(seq,
 863                    "Globally announced TT entries received via the mesh %s\n",
 864                    net_dev->name);
 865         seq_printf(seq, "       %-13s %s       %-15s %s %s\n",
 866                    "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
 867
 868         for (i = 0; i < hash->size; i++) {
 869                 head = &hash->table[i];
 870
 871                 rcu_read_lock();
 872                 hlist_for_each_entry_rcu(tt_common_entry, node,
 873                                          head, hash_entry) {
 874                         tt_global = container_of(tt_common_entry,
 875                                                  struct batadv_tt_global_entry,
 876                                                  common);
 877                         batadv_tt_global_print_entry(tt_global, seq);
 878                 }
 879                 rcu_read_unlock();
 880         }
 881 out:
 882         if (primary_if)
 883                 batadv_hardif_free_ref(primary_if);
 884         return ret;
 885 }
 886
 887 /* deletes the orig list of a tt_global_entry */
 888 static void
 889 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
 890 {
 891         struct hlist_head *head;
 892         struct hlist_node *node, *safe;
 893         struct batadv_tt_orig_list_entry *orig_entry;
 894
 895         spin_lock_bh(&tt_global_entry->list_lock);
 896         head = &tt_global_entry->orig_list;
 897         hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
 898                 hlist_del_rcu(node);
 899                 batadv_tt_orig_list_entry_free_ref(orig_entry);
 900         }
 901         spin_unlock_bh(&tt_global_entry->list_lock);
 902
 903 }
 904
 905 static void
 906 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
 907                                 struct batadv_tt_global_entry *tt_global_entry,
 908                                 struct batadv_orig_node *orig_node,
 909                                 const char *message)
 910 {
 911         struct hlist_head *head;
 912         struct hlist_node *node, *safe;
 913         struct batadv_tt_orig_list_entry *orig_entry;
 914
 915         spin_lock_bh(&tt_global_entry->list_lock);
 916         head = &tt_global_entry->orig_list;
 917         hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
 918                 if (orig_entry->orig_node == orig_node) {
 919                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 920                                    "Deleting %pM from global tt entry %pM: %s\n",
 921                                    orig_node->orig,
 922                                    tt_global_entry->common.addr, message);
 923                         hlist_del_rcu(node);
 924                         batadv_tt_orig_list_entry_free_ref(orig_entry);
 925                 }
 926         }
 927         spin_unlock_bh(&tt_global_entry->list_lock);
 928 }
 929
 930 static void
 931 batadv_tt_global_del_struct(struct batadv_priv *bat_priv,
 932                             struct batadv_tt_global_entry *tt_global_entry,
 933                             const char *message)
 934 {
 935         batadv_dbg(BATADV_DBG_TT, bat_priv,
 936                    "Deleting global tt entry %pM: %s\n",
 937                    tt_global_entry->common.addr, message);
 938
 939         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 940                            batadv_choose_orig, tt_global_entry->common.addr);
 941         batadv_tt_global_entry_free_ref(tt_global_entry);
 942
 943 }
 944
 945 /* If the client is to be deleted, we check if it is the last origantor entry
 946  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
 947  * timer, otherwise we simply remove the originator scheduled for deletion.
 948  */
 949 static void
 950 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
 951                              struct batadv_tt_global_entry *tt_global_entry,
 952                              struct batadv_orig_node *orig_node,
 953                              const char *message)
 954 {
 955         bool last_entry = true;
 956         struct hlist_head *head;
 957         struct hlist_node *node;
 958         struct batadv_tt_orig_list_entry *orig_entry;
 959
 960         /* no local entry exists, case 1:
 961          * Check if this is the last one or if other entries exist.
 962          */
 963
 964         rcu_read_lock();
 965         head = &tt_global_entry->orig_list;
 966         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
 967                 if (orig_entry->orig_node != orig_node) {
 968                         last_entry = false;
 969                         break;
 970                 }
 971         }
 972         rcu_read_unlock();
 973
 974         if (last_entry) {
 975                 /* its the last one, mark for roaming. */
 976                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
 977                 tt_global_entry->roam_at = jiffies;
 978         } else
 979                 /* there is another entry, we can simply delete this
 980                  * one and can still use the other one.
 981                  */
 982                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
 983                                                 orig_node, message);
 984 }
 985
 986
 987
 988 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
 989                                  struct batadv_orig_node *orig_node,
 990                                  const unsigned char *addr,
 991                                  const char *message, bool roaming)
 992 {
 993         struct batadv_tt_global_entry *tt_global_entry = NULL;
 994         struct batadv_tt_local_entry *local_entry = NULL;
 995
 996         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
 997         if (!tt_global_entry)
 998                 goto out;
 999
1000         if (!roaming) {
1001                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1002                                                 orig_node, message);
1003
1004                 if (hlist_empty(&tt_global_entry->orig_list))
1005                         batadv_tt_global_del_struct(bat_priv, tt_global_entry,
1006                                                     message);
1007
1008                 goto out;
1009         }
1010
1011         /* if we are deleting a global entry due to a roam
1012          * event, there are two possibilities:
1013          * 1) the client roamed from node A to node B => if there
1014          *    is only one originator left for this client, we mark
1015          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1016          *    wait for node B to claim it. In case of timeout
1017          *    the entry is purged.
1018          *
1019          *    If there are other originators left, we directly delete
1020          *    the originator.
1021          * 2) the client roamed to us => we can directly delete
1022          *    the global entry, since it is useless now.
1023          */
1024         local_entry = batadv_tt_local_hash_find(bat_priv,
1025                                                 tt_global_entry->common.addr);
1026         if (local_entry) {
1027                 /* local entry exists, case 2: client roamed to us. */
1028                 batadv_tt_global_del_orig_list(tt_global_entry);
1029                 batadv_tt_global_del_struct(bat_priv, tt_global_entry, message);
1030         } else
1031                 /* no local entry exists, case 1: check for roaming */
1032                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1033                                              orig_node, message);
1034
1035
1036 out:
1037         if (tt_global_entry)
1038                 batadv_tt_global_entry_free_ref(tt_global_entry);
1039         if (local_entry)
1040                 batadv_tt_local_entry_free_ref(local_entry);
1041 }
1042
1043 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1044                                struct batadv_orig_node *orig_node,
1045                                const char *message)
1046 {
1047         struct batadv_tt_global_entry *tt_global;
1048         struct batadv_tt_common_entry *tt_common_entry;
1049         uint32_t i;
1050         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1051         struct hlist_node *node, *safe;
1052         struct hlist_head *head;
1053         spinlock_t *list_lock; /* protects write access to the hash lists */
1054
1055         if (!hash)
1056                 return;
1057
1058         for (i = 0; i < hash->size; i++) {
1059                 head = &hash->table[i];
1060                 list_lock = &hash->list_locks[i];
1061
1062                 spin_lock_bh(list_lock);
1063                 hlist_for_each_entry_safe(tt_common_entry, node, safe,
1064                                           head, hash_entry) {
1065                         tt_global = container_of(tt_common_entry,
1066                                                  struct batadv_tt_global_entry,
1067                                                  common);
1068
1069                         batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1070                                                         orig_node, message);
1071
1072                         if (hlist_empty(&tt_global->orig_list)) {
1073                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1074                                            "Deleting global tt entry %pM: %s\n",
1075                                            tt_global->common.addr, message);
1076                                 hlist_del_rcu(node);
1077                                 batadv_tt_global_entry_free_ref(tt_global);
1078                         }
1079                 }
1080                 spin_unlock_bh(list_lock);
1081         }
1082         orig_node->tt_initialised = false;
1083 }
1084
1085 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1086                                       char **msg)
1087 {
1088         bool purge = false;
1089         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1090         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1091
1092         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1093             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1094                 purge = true;
1095                 *msg = "Roaming timeout\n";
1096         }
1097
1098         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1099             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1100                 purge = true;
1101                 *msg = "Temporary client timeout\n";
1102         }
1103
1104         return purge;
1105 }
1106
1107 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1108 {
1109         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1110         struct hlist_head *head;
1111         struct hlist_node *node, *node_tmp;
1112         spinlock_t *list_lock; /* protects write access to the hash lists */
1113         uint32_t i;
1114         char *msg = NULL;
1115         struct batadv_tt_common_entry *tt_common;
1116         struct batadv_tt_global_entry *tt_global;
1117
1118         for (i = 0; i < hash->size; i++) {
1119                 head = &hash->table[i];
1120                 list_lock = &hash->list_locks[i];
1121
1122                 spin_lock_bh(list_lock);
1123                 hlist_for_each_entry_safe(tt_common, node, node_tmp, head,
1124                                           hash_entry) {
1125                         tt_global = container_of(tt_common,
1126                                                  struct batadv_tt_global_entry,
1127                                                  common);
1128
1129                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1130                                 continue;
1131
1132                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1133                                    "Deleting global tt entry (%pM): %s\n",
1134                                    tt_global->common.addr, msg);
1135
1136                         hlist_del_rcu(node);
1137
1138                         batadv_tt_global_entry_free_ref(tt_global);
1139                 }
1140                 spin_unlock_bh(list_lock);
1141         }
1142 }
1143
1144 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1145 {
1146         struct batadv_hashtable *hash;
1147         spinlock_t *list_lock; /* protects write access to the hash lists */
1148         struct batadv_tt_common_entry *tt_common_entry;
1149         struct batadv_tt_global_entry *tt_global;
1150         struct hlist_node *node, *node_tmp;
1151         struct hlist_head *head;
1152         uint32_t i;
1153
1154         if (!bat_priv->tt.global_hash)
1155                 return;
1156
1157         hash = bat_priv->tt.global_hash;
1158
1159         for (i = 0; i < hash->size; i++) {
1160                 head = &hash->table[i];
1161                 list_lock = &hash->list_locks[i];
1162
1163                 spin_lock_bh(list_lock);
1164                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
1165                                           head, hash_entry) {
1166                         hlist_del_rcu(node);
1167                         tt_global = container_of(tt_common_entry,
1168                                                  struct batadv_tt_global_entry,
1169                                                  common);
1170                         batadv_tt_global_entry_free_ref(tt_global);
1171                 }
1172                 spin_unlock_bh(list_lock);
1173         }
1174
1175         batadv_hash_destroy(hash);
1176
1177         bat_priv->tt.global_hash = NULL;
1178 }
1179
1180 static bool
1181 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1182                        struct batadv_tt_global_entry *tt_global_entry)
1183 {
1184         bool ret = false;
1185
1186         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1187             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1188                 ret = true;
1189
1190         return ret;
1191 }
1192
1193 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1194                                                   const uint8_t *src,
1195                                                   const uint8_t *addr)
1196 {
1197         struct batadv_tt_local_entry *tt_local_entry = NULL;
1198         struct batadv_tt_global_entry *tt_global_entry = NULL;
1199         struct batadv_orig_node *orig_node = NULL;
1200         struct batadv_neigh_node *router = NULL;
1201         struct hlist_head *head;
1202         struct hlist_node *node;
1203         struct batadv_tt_orig_list_entry *orig_entry;
1204         int best_tq;
1205
1206         if (src && atomic_read(&bat_priv->ap_isolation)) {
1207                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src);
1208                 if (!tt_local_entry)
1209                         goto out;
1210         }
1211
1212         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
1213         if (!tt_global_entry)
1214                 goto out;
1215
1216         /* check whether the clients should not communicate due to AP
1217          * isolation
1218          */
1219         if (tt_local_entry &&
1220             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1221                 goto out;
1222
1223         best_tq = 0;
1224
1225         rcu_read_lock();
1226         head = &tt_global_entry->orig_list;
1227         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
1228                 router = batadv_orig_node_get_router(orig_entry->orig_node);
1229                 if (!router)
1230                         continue;
1231
1232                 if (router->tq_avg > best_tq) {
1233                         orig_node = orig_entry->orig_node;
1234                         best_tq = router->tq_avg;
1235                 }
1236                 batadv_neigh_node_free_ref(router);
1237         }
1238         /* found anything? */
1239         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1240                 orig_node = NULL;
1241         rcu_read_unlock();
1242 out:
1243         if (tt_global_entry)
1244                 batadv_tt_global_entry_free_ref(tt_global_entry);
1245         if (tt_local_entry)
1246                 batadv_tt_local_entry_free_ref(tt_local_entry);
1247
1248         return orig_node;
1249 }
1250
1251 /* Calculates the checksum of the local table of a given orig_node */
1252 static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1253                                      struct batadv_orig_node *orig_node)
1254 {
1255         uint16_t total = 0, total_one;
1256         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1257         struct batadv_tt_common_entry *tt_common;
1258         struct batadv_tt_global_entry *tt_global;
1259         struct hlist_node *node;
1260         struct hlist_head *head;
1261         uint32_t i;
1262         int j;
1263
1264         for (i = 0; i < hash->size; i++) {
1265                 head = &hash->table[i];
1266
1267                 rcu_read_lock();
1268                 hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) {
1269                         tt_global = container_of(tt_common,
1270                                                  struct batadv_tt_global_entry,
1271                                                  common);
1272                         /* Roaming clients are in the global table for
1273                          * consistency only. They don't have to be
1274                          * taken into account while computing the
1275                          * global crc
1276                          */
1277                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
1278                                 continue;
1279                         /* Temporary clients have not been announced yet, so
1280                          * they have to be skipped while computing the global
1281                          * crc
1282                          */
1283                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
1284                                 continue;
1285
1286                         /* find out if this global entry is announced by this
1287                          * originator
1288                          */
1289                         if (!batadv_tt_global_entry_has_orig(tt_global,
1290                                                              orig_node))
1291                                 continue;
1292
1293                         total_one = 0;
1294                         for (j = 0; j < ETH_ALEN; j++)
1295                                 total_one = crc16_byte(total_one,
1296                                                        tt_common->addr[j]);
1297                         total ^= total_one;
1298                 }
1299                 rcu_read_unlock();
1300         }
1301
1302         return total;
1303 }
1304
1305 /* Calculates the checksum of the local table */
1306 static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv)
1307 {
1308         uint16_t total = 0, total_one;
1309         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1310         struct batadv_tt_common_entry *tt_common;
1311         struct hlist_node *node;
1312         struct hlist_head *head;
1313         uint32_t i;
1314         int j;
1315
1316         for (i = 0; i < hash->size; i++) {
1317                 head = &hash->table[i];
1318
1319                 rcu_read_lock();
1320                 hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) {
1321                         /* not yet committed clients have not to be taken into
1322                          * account while computing the CRC
1323                          */
1324                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
1325                                 continue;
1326                         total_one = 0;
1327                         for (j = 0; j < ETH_ALEN; j++)
1328                                 total_one = crc16_byte(total_one,
1329                                                        tt_common->addr[j]);
1330                         total ^= total_one;
1331                 }
1332                 rcu_read_unlock();
1333         }
1334
1335         return total;
1336 }
1337
1338 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
1339 {
1340         struct batadv_tt_req_node *node, *safe;
1341
1342         spin_lock_bh(&bat_priv->tt.req_list_lock);
1343
1344         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
1345                 list_del(&node->list);
1346                 kfree(node);
1347         }
1348
1349         spin_unlock_bh(&bat_priv->tt.req_list_lock);
1350 }
1351
1352 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
1353                                        struct batadv_orig_node *orig_node,
1354                                        const unsigned char *tt_buff,
1355                                        uint8_t tt_num_changes)
1356 {
1357         uint16_t tt_buff_len = batadv_tt_len(tt_num_changes);
1358
1359         /* Replace the old buffer only if I received something in the
1360          * last OGM (the OGM could carry no changes)
1361          */
1362         spin_lock_bh(&orig_node->tt_buff_lock);
1363         if (tt_buff_len > 0) {
1364                 kfree(orig_node->tt_buff);
1365                 orig_node->tt_buff_len = 0;
1366                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
1367                 if (orig_node->tt_buff) {
1368                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
1369                         orig_node->tt_buff_len = tt_buff_len;
1370                 }
1371         }
1372         spin_unlock_bh(&orig_node->tt_buff_lock);
1373 }
1374
1375 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
1376 {
1377         struct batadv_tt_req_node *node, *safe;
1378
1379         spin_lock_bh(&bat_priv->tt.req_list_lock);
1380         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
1381                 if (batadv_has_timed_out(node->issued_at,
1382                                          BATADV_TT_REQUEST_TIMEOUT)) {
1383                         list_del(&node->list);
1384                         kfree(node);
1385                 }
1386         }
1387         spin_unlock_bh(&bat_priv->tt.req_list_lock);
1388 }
1389
1390 /* returns the pointer to the new tt_req_node struct if no request
1391  * has already been issued for this orig_node, NULL otherwise
1392  */
1393 static struct batadv_tt_req_node *
1394 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
1395                        struct batadv_orig_node *orig_node)
1396 {
1397         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
1398
1399         spin_lock_bh(&bat_priv->tt.req_list_lock);
1400         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
1401                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
1402                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
1403                                           BATADV_TT_REQUEST_TIMEOUT))
1404                         goto unlock;
1405         }
1406
1407         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1408         if (!tt_req_node)
1409                 goto unlock;
1410
1411         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1412         tt_req_node->issued_at = jiffies;
1413
1414         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
1415 unlock:
1416         spin_unlock_bh(&bat_priv->tt.req_list_lock);
1417         return tt_req_node;
1418 }
1419
1420 /* data_ptr is useless here, but has to be kept to respect the prototype */
1421 static int batadv_tt_local_valid_entry(const void *entry_ptr,
1422                                        const void *data_ptr)
1423 {
1424         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
1425
1426         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
1427                 return 0;
1428         return 1;
1429 }
1430
1431 static int batadv_tt_global_valid(const void *entry_ptr,
1432                                   const void *data_ptr)
1433 {
1434         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
1435         const struct batadv_tt_global_entry *tt_global_entry;
1436         const struct batadv_orig_node *orig_node = data_ptr;
1437
1438         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
1439             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
1440                 return 0;
1441
1442         tt_global_entry = container_of(tt_common_entry,
1443                                        struct batadv_tt_global_entry,
1444                                        common);
1445
1446         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
1447 }
1448
1449 static struct sk_buff *
1450 batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1451                               struct batadv_hashtable *hash,
1452                               struct batadv_hard_iface *primary_if,
1453                               int (*valid_cb)(const void *, const void *),
1454                               void *cb_data)
1455 {
1456         struct batadv_tt_common_entry *tt_common_entry;
1457         struct batadv_tt_query_packet *tt_response;
1458         struct batadv_tt_change *tt_change;
1459         struct hlist_node *node;
1460         struct hlist_head *head;
1461         struct sk_buff *skb = NULL;
1462         uint16_t tt_tot, tt_count;
1463         ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet);
1464         uint32_t i;
1465         size_t len;
1466
1467         if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1468                 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1469                 tt_len -= tt_len % sizeof(struct batadv_tt_change);
1470         }
1471         tt_tot = tt_len / sizeof(struct batadv_tt_change);
1472
1473         len = tt_query_size + tt_len;
1474         skb = dev_alloc_skb(len + ETH_HLEN);
1475         if (!skb)
1476                 goto out;
1477
1478         skb_reserve(skb, ETH_HLEN);
1479         tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len);
1480         tt_response->ttvn = ttvn;
1481
1482         tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size);
1483         tt_count = 0;
1484
1485         rcu_read_lock();
1486         for (i = 0; i < hash->size; i++) {
1487                 head = &hash->table[i];
1488
1489                 hlist_for_each_entry_rcu(tt_common_entry, node,
1490                                          head, hash_entry) {
1491                         if (tt_count == tt_tot)
1492                                 break;
1493
1494                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
1495                                 continue;
1496
1497                         memcpy(tt_change->addr, tt_common_entry->addr,
1498                                ETH_ALEN);
1499                         tt_change->flags = BATADV_NO_FLAGS;
1500
1501                         tt_count++;
1502                         tt_change++;
1503                 }
1504         }
1505         rcu_read_unlock();
1506
1507         /* store in the message the number of entries we have successfully
1508          * copied
1509          */
1510         tt_response->tt_data = htons(tt_count);
1511
1512 out:
1513         return skb;
1514 }
1515
1516 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
1517                                   struct batadv_orig_node *dst_orig_node,
1518                                   uint8_t ttvn, uint16_t tt_crc,
1519                                   bool full_table)
1520 {
1521         struct sk_buff *skb = NULL;
1522         struct batadv_tt_query_packet *tt_request;
1523         struct batadv_neigh_node *neigh_node = NULL;
1524         struct batadv_hard_iface *primary_if;
1525         struct batadv_tt_req_node *tt_req_node = NULL;
1526         int ret = 1;
1527         size_t tt_req_len;
1528
1529         primary_if = batadv_primary_if_get_selected(bat_priv);
1530         if (!primary_if)
1531                 goto out;
1532
1533         /* The new tt_req will be issued only if I'm not waiting for a
1534          * reply from the same orig_node yet
1535          */
1536         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
1537         if (!tt_req_node)
1538                 goto out;
1539
1540         skb = dev_alloc_skb(sizeof(*tt_request) + ETH_HLEN);
1541         if (!skb)
1542                 goto out;
1543
1544         skb_reserve(skb, ETH_HLEN);
1545
1546         tt_req_len = sizeof(*tt_request);
1547         tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len);
1548
1549         tt_request->header.packet_type = BATADV_TT_QUERY;
1550         tt_request->header.version = BATADV_COMPAT_VERSION;
1551         memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1552         memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1553         tt_request->header.ttl = BATADV_TTL;
1554         tt_request->ttvn = ttvn;
1555         tt_request->tt_data = htons(tt_crc);
1556         tt_request->flags = BATADV_TT_REQUEST;
1557
1558         if (full_table)
1559                 tt_request->flags |= BATADV_TT_FULL_TABLE;
1560
1561         neigh_node = batadv_orig_node_get_router(dst_orig_node);
1562         if (!neigh_node)
1563                 goto out;
1564
1565         batadv_dbg(BATADV_DBG_TT, bat_priv,
1566                    "Sending TT_REQUEST to %pM via %pM [%c]\n",
1567                    dst_orig_node->orig, neigh_node->addr,
1568                    (full_table ? 'F' : '.'));
1569
1570         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
1571
1572         batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1573         ret = 0;
1574
1575 out:
1576         if (neigh_node)
1577                 batadv_neigh_node_free_ref(neigh_node);
1578         if (primary_if)
1579                 batadv_hardif_free_ref(primary_if);
1580         if (ret)
1581                 kfree_skb(skb);
1582         if (ret && tt_req_node) {
1583                 spin_lock_bh(&bat_priv->tt.req_list_lock);
1584                 list_del(&tt_req_node->list);
1585                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
1586                 kfree(tt_req_node);
1587         }
1588         return ret;
1589 }
1590
1591 static bool
1592 batadv_send_other_tt_response(struct batadv_priv *bat_priv,
1593                               struct batadv_tt_query_packet *tt_request)
1594 {
1595         struct batadv_orig_node *req_dst_orig_node = NULL;
1596         struct batadv_orig_node *res_dst_orig_node = NULL;
1597         struct batadv_neigh_node *neigh_node = NULL;
1598         struct batadv_hard_iface *primary_if = NULL;
1599         uint8_t orig_ttvn, req_ttvn, ttvn;
1600         int ret = false;
1601         unsigned char *tt_buff;
1602         bool full_table;
1603         uint16_t tt_len, tt_tot;
1604         struct sk_buff *skb = NULL;
1605         struct batadv_tt_query_packet *tt_response;
1606         uint8_t *packet_pos;
1607         size_t len;
1608
1609         batadv_dbg(BATADV_DBG_TT, bat_priv,
1610                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1611                    tt_request->src, tt_request->ttvn, tt_request->dst,
1612                    (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1613
1614         /* Let's get the orig node of the REAL destination */
1615         req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst);
1616         if (!req_dst_orig_node)
1617                 goto out;
1618
1619         res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
1620         if (!res_dst_orig_node)
1621                 goto out;
1622
1623         neigh_node = batadv_orig_node_get_router(res_dst_orig_node);
1624         if (!neigh_node)
1625                 goto out;
1626
1627         primary_if = batadv_primary_if_get_selected(bat_priv);
1628         if (!primary_if)
1629                 goto out;
1630
1631         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1632         req_ttvn = tt_request->ttvn;
1633
1634         /* I don't have the requested data */
1635         if (orig_ttvn != req_ttvn ||
1636             tt_request->tt_data != htons(req_dst_orig_node->tt_crc))
1637                 goto out;
1638
1639         /* If the full table has been explicitly requested */
1640         if (tt_request->flags & BATADV_TT_FULL_TABLE ||
1641             !req_dst_orig_node->tt_buff)
1642                 full_table = true;
1643         else
1644                 full_table = false;
1645
1646         /* In this version, fragmentation is not implemented, then
1647          * I'll send only one packet with as much TT entries as I can
1648          */
1649         if (!full_table) {
1650                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1651                 tt_len = req_dst_orig_node->tt_buff_len;
1652                 tt_tot = tt_len / sizeof(struct batadv_tt_change);
1653
1654                 len = sizeof(*tt_response) + tt_len;
1655                 skb = dev_alloc_skb(len + ETH_HLEN);
1656                 if (!skb)
1657                         goto unlock;
1658
1659                 skb_reserve(skb, ETH_HLEN);
1660                 packet_pos = skb_put(skb, len);
1661                 tt_response = (struct batadv_tt_query_packet *)packet_pos;
1662                 tt_response->ttvn = req_ttvn;
1663                 tt_response->tt_data = htons(tt_tot);
1664
1665                 tt_buff = skb->data + sizeof(*tt_response);
1666                 /* Copy the last orig_node's OGM buffer */
1667                 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1668                        req_dst_orig_node->tt_buff_len);
1669
1670                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1671         } else {
1672                 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size);
1673                 tt_len *= sizeof(struct batadv_tt_change);
1674                 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1675
1676                 skb = batadv_tt_response_fill_table(tt_len, ttvn,
1677                                                     bat_priv->tt.global_hash,
1678                                                     primary_if,
1679                                                     batadv_tt_global_valid,
1680                                                     req_dst_orig_node);
1681                 if (!skb)
1682                         goto out;
1683
1684                 tt_response = (struct batadv_tt_query_packet *)skb->data;
1685         }
1686
1687         tt_response->header.packet_type = BATADV_TT_QUERY;
1688         tt_response->header.version = BATADV_COMPAT_VERSION;
1689         tt_response->header.ttl = BATADV_TTL;
1690         memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1691         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1692         tt_response->flags = BATADV_TT_RESPONSE;
1693
1694         if (full_table)
1695                 tt_response->flags |= BATADV_TT_FULL_TABLE;
1696
1697         batadv_dbg(BATADV_DBG_TT, bat_priv,
1698                    "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1699                    res_dst_orig_node->orig, neigh_node->addr,
1700                    req_dst_orig_node->orig, req_ttvn);
1701
1702         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
1703
1704         batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1705         ret = true;
1706         goto out;
1707
1708 unlock:
1709         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1710
1711 out:
1712         if (res_dst_orig_node)
1713                 batadv_orig_node_free_ref(res_dst_orig_node);
1714         if (req_dst_orig_node)
1715                 batadv_orig_node_free_ref(req_dst_orig_node);
1716         if (neigh_node)
1717                 batadv_neigh_node_free_ref(neigh_node);
1718         if (primary_if)
1719                 batadv_hardif_free_ref(primary_if);
1720         if (!ret)
1721                 kfree_skb(skb);
1722         return ret;
1723
1724 }
1725
1726 static bool
1727 batadv_send_my_tt_response(struct batadv_priv *bat_priv,
1728                            struct batadv_tt_query_packet *tt_request)
1729 {
1730         struct batadv_orig_node *orig_node = NULL;
1731         struct batadv_neigh_node *neigh_node = NULL;
1732         struct batadv_hard_iface *primary_if = NULL;
1733         uint8_t my_ttvn, req_ttvn, ttvn;
1734         int ret = false;
1735         unsigned char *tt_buff;
1736         bool full_table;
1737         uint16_t tt_len, tt_tot;
1738         struct sk_buff *skb = NULL;
1739         struct batadv_tt_query_packet *tt_response;
1740         uint8_t *packet_pos;
1741         size_t len;
1742
1743         batadv_dbg(BATADV_DBG_TT, bat_priv,
1744                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1745                    tt_request->src, tt_request->ttvn,
1746                    (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1747
1748
1749         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
1750         req_ttvn = tt_request->ttvn;
1751
1752         orig_node = batadv_orig_hash_find(bat_priv, tt_request->src);
1753         if (!orig_node)
1754                 goto out;
1755
1756         neigh_node = batadv_orig_node_get_router(orig_node);
1757         if (!neigh_node)
1758                 goto out;
1759
1760         primary_if = batadv_primary_if_get_selected(bat_priv);
1761         if (!primary_if)
1762                 goto out;
1763
1764         /* If the full table has been explicitly requested or the gap
1765          * is too big send the whole local translation table
1766          */
1767         if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
1768             !bat_priv->tt.last_changeset)
1769                 full_table = true;
1770         else
1771                 full_table = false;
1772
1773         /* In this version, fragmentation is not implemented, then
1774          * I'll send only one packet with as much TT entries as I can
1775          */
1776         if (!full_table) {
1777                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
1778                 tt_len = bat_priv->tt.last_changeset_len;
1779                 tt_tot = tt_len / sizeof(struct batadv_tt_change);
1780
1781                 len = sizeof(*tt_response) + tt_len;
1782                 skb = dev_alloc_skb(len + ETH_HLEN);
1783                 if (!skb)
1784                         goto unlock;
1785
1786                 skb_reserve(skb, ETH_HLEN);
1787                 packet_pos = skb_put(skb, len);
1788                 tt_response = (struct batadv_tt_query_packet *)packet_pos;
1789                 tt_response->ttvn = req_ttvn;
1790                 tt_response->tt_data = htons(tt_tot);
1791
1792                 tt_buff = skb->data + sizeof(*tt_response);
1793                 memcpy(tt_buff, bat_priv->tt.last_changeset,
1794                        bat_priv->tt.last_changeset_len);
1795                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1796         } else {
1797                 tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num);
1798                 tt_len *= sizeof(struct batadv_tt_change);
1799                 ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
1800
1801                 skb = batadv_tt_response_fill_table(tt_len, ttvn,
1802                                                     bat_priv->tt.local_hash,
1803                                                     primary_if,
1804                                                     batadv_tt_local_valid_entry,
1805                                                     NULL);
1806                 if (!skb)
1807                         goto out;
1808
1809                 tt_response = (struct batadv_tt_query_packet *)skb->data;
1810         }
1811
1812         tt_response->header.packet_type = BATADV_TT_QUERY;
1813         tt_response->header.version = BATADV_COMPAT_VERSION;
1814         tt_response->header.ttl = BATADV_TTL;
1815         memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1816         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1817         tt_response->flags = BATADV_TT_RESPONSE;
1818
1819         if (full_table)
1820                 tt_response->flags |= BATADV_TT_FULL_TABLE;
1821
1822         batadv_dbg(BATADV_DBG_TT, bat_priv,
1823                    "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1824                    orig_node->orig, neigh_node->addr,
1825                    (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1826
1827         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
1828
1829         batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1830         ret = true;
1831         goto out;
1832
1833 unlock:
1834         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1835 out:
1836         if (orig_node)
1837                 batadv_orig_node_free_ref(orig_node);
1838         if (neigh_node)
1839                 batadv_neigh_node_free_ref(neigh_node);
1840         if (primary_if)
1841                 batadv_hardif_free_ref(primary_if);
1842         if (!ret)
1843                 kfree_skb(skb);
1844         /* This packet was for me, so it doesn't need to be re-routed */
1845         return true;
1846 }
1847
1848 bool batadv_send_tt_response(struct batadv_priv *bat_priv,
1849                              struct batadv_tt_query_packet *tt_request)
1850 {
1851         if (batadv_is_my_mac(tt_request->dst)) {
1852                 /* don't answer backbone gws! */
1853                 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src))
1854                         return true;
1855
1856                 return batadv_send_my_tt_response(bat_priv, tt_request);
1857         } else {
1858                 return batadv_send_other_tt_response(bat_priv, tt_request);
1859         }
1860 }
1861
1862 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
1863                                       struct batadv_orig_node *orig_node,
1864                                       struct batadv_tt_change *tt_change,
1865                                       uint16_t tt_num_changes, uint8_t ttvn)
1866 {
1867         int i;
1868         int roams;
1869
1870         for (i = 0; i < tt_num_changes; i++) {
1871                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
1872                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
1873                         batadv_tt_global_del(bat_priv, orig_node,
1874                                              (tt_change + i)->addr,
1875                                              "tt removed by changes",
1876                                              roams);
1877                 } else {
1878                         if (!batadv_tt_global_add(bat_priv, orig_node,
1879                                                   (tt_change + i)->addr,
1880                                                   (tt_change + i)->flags, ttvn))
1881                                 /* In case of problem while storing a
1882                                  * global_entry, we stop the updating
1883                                  * procedure without committing the
1884                                  * ttvn change. This will avoid to send
1885                                  * corrupted data on tt_request
1886                                  */
1887                                 return;
1888                 }
1889         }
1890         orig_node->tt_initialised = true;
1891 }
1892
1893 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
1894                                   struct batadv_tt_query_packet *tt_response)
1895 {
1896         struct batadv_orig_node *orig_node = NULL;
1897
1898         orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
1899         if (!orig_node)
1900                 goto out;
1901
1902         /* Purge the old table first.. */
1903         batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table");
1904
1905         _batadv_tt_update_changes(bat_priv, orig_node,
1906                                   (struct batadv_tt_change *)(tt_response + 1),
1907                                   ntohs(tt_response->tt_data),
1908                                   tt_response->ttvn);
1909
1910         spin_lock_bh(&orig_node->tt_buff_lock);
1911         kfree(orig_node->tt_buff);
1912         orig_node->tt_buff_len = 0;
1913         orig_node->tt_buff = NULL;
1914         spin_unlock_bh(&orig_node->tt_buff_lock);
1915
1916         atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1917
1918 out:
1919         if (orig_node)
1920                 batadv_orig_node_free_ref(orig_node);
1921 }
1922
1923 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
1924                                      struct batadv_orig_node *orig_node,
1925                                      uint16_t tt_num_changes, uint8_t ttvn,
1926                                      struct batadv_tt_change *tt_change)
1927 {
1928         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
1929                                   tt_num_changes, ttvn);
1930
1931         batadv_tt_save_orig_buffer(bat_priv, orig_node,
1932                                    (unsigned char *)tt_change, tt_num_changes);
1933         atomic_set(&orig_node->last_ttvn, ttvn);
1934 }
1935
1936 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr)
1937 {
1938         struct batadv_tt_local_entry *tt_local_entry = NULL;
1939         bool ret = false;
1940
1941         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
1942         if (!tt_local_entry)
1943                 goto out;
1944         /* Check if the client has been logically deleted (but is kept for
1945          * consistency purpose)
1946          */
1947         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1948                 goto out;
1949         ret = true;
1950 out:
1951         if (tt_local_entry)
1952                 batadv_tt_local_entry_free_ref(tt_local_entry);
1953         return ret;
1954 }
1955
1956 void batadv_handle_tt_response(struct batadv_priv *bat_priv,
1957                                struct batadv_tt_query_packet *tt_response)
1958 {
1959         struct batadv_tt_req_node *node, *safe;
1960         struct batadv_orig_node *orig_node = NULL;
1961         struct batadv_tt_change *tt_change;
1962
1963         batadv_dbg(BATADV_DBG_TT, bat_priv,
1964                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
1965                    tt_response->src, tt_response->ttvn,
1966                    ntohs(tt_response->tt_data),
1967                    (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
1968
1969         /* we should have never asked a backbone gw */
1970         if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src))
1971                 goto out;
1972
1973         orig_node = batadv_orig_hash_find(bat_priv, tt_response->src);
1974         if (!orig_node)
1975                 goto out;
1976
1977         if (tt_response->flags & BATADV_TT_FULL_TABLE) {
1978                 batadv_tt_fill_gtable(bat_priv, tt_response);
1979         } else {
1980                 tt_change = (struct batadv_tt_change *)(tt_response + 1);
1981                 batadv_tt_update_changes(bat_priv, orig_node,
1982                                          ntohs(tt_response->tt_data),
1983                                          tt_response->ttvn, tt_change);
1984         }
1985
1986         /* Delete the tt_req_node from pending tt_requests list */
1987         spin_lock_bh(&bat_priv->tt.req_list_lock);
1988         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
1989                 if (!batadv_compare_eth(node->addr, tt_response->src))
1990                         continue;
1991                 list_del(&node->list);
1992                 kfree(node);
1993         }
1994         spin_unlock_bh(&bat_priv->tt.req_list_lock);
1995
1996         /* Recalculate the CRC for this orig_node and store it */
1997         orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
1998         /* Roaming phase is over: tables are in sync again. I can
1999          * unset the flag
2000          */
2001         orig_node->tt_poss_change = false;
2002 out:
2003         if (orig_node)
2004                 batadv_orig_node_free_ref(orig_node);
2005 }
2006
2007 int batadv_tt_init(struct batadv_priv *bat_priv)
2008 {
2009         int ret;
2010
2011         ret = batadv_tt_local_init(bat_priv);
2012         if (ret < 0)
2013                 return ret;
2014
2015         ret = batadv_tt_global_init(bat_priv);
2016         if (ret < 0)
2017                 return ret;
2018
2019         batadv_tt_start_timer(bat_priv);
2020
2021         return 1;
2022 }
2023
2024 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2025 {
2026         struct batadv_tt_roam_node *node, *safe;
2027
2028         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2029
2030         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2031                 list_del(&node->list);
2032                 kfree(node);
2033         }
2034
2035         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2036 }
2037
2038 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2039 {
2040         struct batadv_tt_roam_node *node, *safe;
2041
2042         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2043         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2044                 if (!batadv_has_timed_out(node->first_time,
2045                                           BATADV_ROAMING_MAX_TIME))
2046                         continue;
2047
2048                 list_del(&node->list);
2049                 kfree(node);
2050         }
2051         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2052 }
2053
2054 /* This function checks whether the client already reached the
2055  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2056  * will not be sent.
2057  *
2058  * returns true if the ROAMING_ADV can be sent, false otherwise
2059  */
2060 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2061                                        uint8_t *client)
2062 {
2063         struct batadv_tt_roam_node *tt_roam_node;
2064         bool ret = false;
2065
2066         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2067         /* The new tt_req will be issued only if I'm not waiting for a
2068          * reply from the same orig_node yet
2069          */
2070         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2071                 if (!batadv_compare_eth(tt_roam_node->addr, client))
2072                         continue;
2073
2074                 if (batadv_has_timed_out(tt_roam_node->first_time,
2075                                          BATADV_ROAMING_MAX_TIME))
2076                         continue;
2077
2078                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2079                         /* Sorry, you roamed too many times! */
2080                         goto unlock;
2081                 ret = true;
2082                 break;
2083         }
2084
2085         if (!ret) {
2086                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2087                 if (!tt_roam_node)
2088                         goto unlock;
2089
2090                 tt_roam_node->first_time = jiffies;
2091                 atomic_set(&tt_roam_node->counter,
2092                            BATADV_ROAMING_MAX_COUNT - 1);
2093                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2094
2095                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2096                 ret = true;
2097         }
2098
2099 unlock:
2100         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2101         return ret;
2102 }
2103
2104 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2105                                  struct batadv_orig_node *orig_node)
2106 {
2107         struct batadv_neigh_node *neigh_node = NULL;
2108         struct sk_buff *skb = NULL;
2109         struct batadv_roam_adv_packet *roam_adv_packet;
2110         int ret = 1;
2111         struct batadv_hard_iface *primary_if;
2112         size_t len = sizeof(*roam_adv_packet);
2113
2114         /* before going on we have to check whether the client has
2115          * already roamed to us too many times
2116          */
2117         if (!batadv_tt_check_roam_count(bat_priv, client))
2118                 goto out;
2119
2120         skb = dev_alloc_skb(sizeof(*roam_adv_packet) + ETH_HLEN);
2121         if (!skb)
2122                 goto out;
2123
2124         skb_reserve(skb, ETH_HLEN);
2125
2126         roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len);
2127
2128         roam_adv_packet->header.packet_type = BATADV_ROAM_ADV;
2129         roam_adv_packet->header.version = BATADV_COMPAT_VERSION;
2130         roam_adv_packet->header.ttl = BATADV_TTL;
2131         roam_adv_packet->reserved = 0;
2132         primary_if = batadv_primary_if_get_selected(bat_priv);
2133         if (!primary_if)
2134                 goto out;
2135         memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
2136         batadv_hardif_free_ref(primary_if);
2137         memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
2138         memcpy(roam_adv_packet->client, client, ETH_ALEN);
2139
2140         neigh_node = batadv_orig_node_get_router(orig_node);
2141         if (!neigh_node)
2142                 goto out;
2143
2144         batadv_dbg(BATADV_DBG_TT, bat_priv,
2145                    "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
2146                    orig_node->orig, client, neigh_node->addr);
2147
2148         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2149
2150         batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
2151         ret = 0;
2152
2153 out:
2154         if (neigh_node)
2155                 batadv_neigh_node_free_ref(neigh_node);
2156         if (ret)
2157                 kfree_skb(skb);
2158         return;
2159 }
2160
2161 static void batadv_tt_purge(struct work_struct *work)
2162 {
2163         struct delayed_work *delayed_work;
2164         struct batadv_priv_tt *priv_tt;
2165         struct batadv_priv *bat_priv;
2166
2167         delayed_work = container_of(work, struct delayed_work, work);
2168         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2169         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
2170
2171         batadv_tt_local_purge(bat_priv);
2172         batadv_tt_global_purge(bat_priv);
2173         batadv_tt_req_purge(bat_priv);
2174         batadv_tt_roam_purge(bat_priv);
2175
2176         batadv_tt_start_timer(bat_priv);
2177 }
2178
2179 void batadv_tt_free(struct batadv_priv *bat_priv)
2180 {
2181         cancel_delayed_work_sync(&bat_priv->tt.work);
2182
2183         batadv_tt_local_table_free(bat_priv);
2184         batadv_tt_global_table_free(bat_priv);
2185         batadv_tt_req_list_free(bat_priv);
2186         batadv_tt_changes_list_free(bat_priv);
2187         batadv_tt_roam_list_free(bat_priv);
2188
2189         kfree(bat_priv->tt.last_changeset);
2190 }
2191
2192 /* This function will enable or disable the specified flags for all the entries
2193  * in the given hash table and returns the number of modified entries
2194  */
2195 static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash,
2196                                     uint16_t flags, bool enable)
2197 {
2198         uint32_t i;
2199         uint16_t changed_num = 0;
2200         struct hlist_head *head;
2201         struct hlist_node *node;
2202         struct batadv_tt_common_entry *tt_common_entry;
2203
2204         if (!hash)
2205                 goto out;
2206
2207         for (i = 0; i < hash->size; i++) {
2208                 head = &hash->table[i];
2209
2210                 rcu_read_lock();
2211                 hlist_for_each_entry_rcu(tt_common_entry, node,
2212                                          head, hash_entry) {
2213                         if (enable) {
2214                                 if ((tt_common_entry->flags & flags) == flags)
2215                                         continue;
2216                                 tt_common_entry->flags |= flags;
2217                         } else {
2218                                 if (!(tt_common_entry->flags & flags))
2219                                         continue;
2220                                 tt_common_entry->flags &= ~flags;
2221                         }
2222                         changed_num++;
2223                 }
2224                 rcu_read_unlock();
2225         }
2226 out:
2227         return changed_num;
2228 }
2229
2230 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
2231 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
2232 {
2233         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2234         struct batadv_tt_common_entry *tt_common;
2235         struct batadv_tt_local_entry *tt_local;
2236         struct hlist_node *node, *node_tmp;
2237         struct hlist_head *head;
2238         spinlock_t *list_lock; /* protects write access to the hash lists */
2239         uint32_t i;
2240
2241         if (!hash)
2242                 return;
2243
2244         for (i = 0; i < hash->size; i++) {
2245                 head = &hash->table[i];
2246                 list_lock = &hash->list_locks[i];
2247
2248                 spin_lock_bh(list_lock);
2249                 hlist_for_each_entry_safe(tt_common, node, node_tmp, head,
2250                                           hash_entry) {
2251                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
2252                                 continue;
2253
2254                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2255                                    "Deleting local tt entry (%pM): pending\n",
2256                                    tt_common->addr);
2257
2258                         atomic_dec(&bat_priv->tt.local_entry_num);
2259                         hlist_del_rcu(node);
2260                         tt_local = container_of(tt_common,
2261                                                 struct batadv_tt_local_entry,
2262                                                 common);
2263                         batadv_tt_local_entry_free_ref(tt_local);
2264                 }
2265                 spin_unlock_bh(list_lock);
2266         }
2267
2268 }
2269
2270 static int batadv_tt_commit_changes(struct batadv_priv *bat_priv,
2271                                     unsigned char **packet_buff,
2272                                     int *packet_buff_len, int packet_min_len)
2273 {
2274         uint16_t changed_num = 0;
2275
2276         if (atomic_read(&bat_priv->tt.local_changes) < 1)
2277                 return -ENOENT;
2278
2279         changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash,
2280                                           BATADV_TT_CLIENT_NEW, false);
2281
2282         /* all reset entries have to be counted as local entries */
2283         atomic_add(changed_num, &bat_priv->tt.local_entry_num);
2284         batadv_tt_local_purge_pending_clients(bat_priv);
2285         bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv);
2286
2287         /* Increment the TTVN only once per OGM interval */
2288         atomic_inc(&bat_priv->tt.vn);
2289         batadv_dbg(BATADV_DBG_TT, bat_priv,
2290                    "Local changes committed, updating to ttvn %u\n",
2291                    (uint8_t)atomic_read(&bat_priv->tt.vn));
2292         bat_priv->tt.poss_change = false;
2293
2294         /* reset the sending counter */
2295         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
2296
2297         return batadv_tt_changes_fill_buff(bat_priv, packet_buff,
2298                                            packet_buff_len, packet_min_len);
2299 }
2300
2301 /* when calling this function (hard_iface == primary_if) has to be true */
2302 int batadv_tt_append_diff(struct batadv_priv *bat_priv,
2303                           unsigned char **packet_buff, int *packet_buff_len,
2304                           int packet_min_len)
2305 {
2306         int tt_num_changes;
2307
2308         /* if at least one change happened */
2309         tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff,
2310                                                   packet_buff_len,
2311                                                   packet_min_len);
2312
2313         /* if the changes have been sent often enough */
2314         if ((tt_num_changes < 0) &&
2315             (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))) {
2316                 batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
2317                                               packet_min_len, packet_min_len);
2318                 tt_num_changes = 0;
2319         }
2320
2321         return tt_num_changes;
2322 }
2323
2324 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
2325                            uint8_t *dst)
2326 {
2327         struct batadv_tt_local_entry *tt_local_entry = NULL;
2328         struct batadv_tt_global_entry *tt_global_entry = NULL;
2329         bool ret = false;
2330
2331         if (!atomic_read(&bat_priv->ap_isolation))
2332                 goto out;
2333
2334         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst);
2335         if (!tt_local_entry)
2336                 goto out;
2337
2338         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src);
2339         if (!tt_global_entry)
2340                 goto out;
2341
2342         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2343                 goto out;
2344
2345         ret = true;
2346
2347 out:
2348         if (tt_global_entry)
2349                 batadv_tt_global_entry_free_ref(tt_global_entry);
2350         if (tt_local_entry)
2351                 batadv_tt_local_entry_free_ref(tt_local_entry);
2352         return ret;
2353 }
2354
2355 void batadv_tt_update_orig(struct batadv_priv *bat_priv,
2356                            struct batadv_orig_node *orig_node,
2357                            const unsigned char *tt_buff, uint8_t tt_num_changes,
2358                            uint8_t ttvn, uint16_t tt_crc)
2359 {
2360         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
2361         bool full_table = true;
2362         struct batadv_tt_change *tt_change;
2363
2364         /* don't care about a backbone gateways updates. */
2365         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
2366                 return;
2367
2368         /* orig table not initialised AND first diff is in the OGM OR the ttvn
2369          * increased by one -> we can apply the attached changes
2370          */
2371         if ((!orig_node->tt_initialised && ttvn == 1) ||
2372             ttvn - orig_ttvn == 1) {
2373                 /* the OGM could not contain the changes due to their size or
2374                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
2375                  * times.
2376                  * In this case send a tt request
2377                  */
2378                 if (!tt_num_changes) {
2379                         full_table = false;
2380                         goto request_table;
2381                 }
2382
2383                 tt_change = (struct batadv_tt_change *)tt_buff;
2384                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
2385                                          ttvn, tt_change);
2386
2387                 /* Even if we received the precomputed crc with the OGM, we
2388                  * prefer to recompute it to spot any possible inconsistency
2389                  * in the global table
2390                  */
2391                 orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
2392
2393                 /* The ttvn alone is not enough to guarantee consistency
2394                  * because a single value could represent different states
2395                  * (due to the wrap around). Thus a node has to check whether
2396                  * the resulting table (after applying the changes) is still
2397                  * consistent or not. E.g. a node could disconnect while its
2398                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2399                  * checking the CRC value is mandatory to detect the
2400                  * inconsistency
2401                  */
2402                 if (orig_node->tt_crc != tt_crc)
2403                         goto request_table;
2404
2405                 /* Roaming phase is over: tables are in sync again. I can
2406                  * unset the flag
2407                  */
2408                 orig_node->tt_poss_change = false;
2409         } else {
2410                 /* if we missed more than one change or our tables are not
2411                  * in sync anymore -> request fresh tt data
2412                  */
2413                 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
2414                     orig_node->tt_crc != tt_crc) {
2415 request_table:
2416                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2417                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2418                                    orig_node->orig, ttvn, orig_ttvn, tt_crc,
2419                                    orig_node->tt_crc, tt_num_changes);
2420                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
2421                                                tt_crc, full_table);
2422                         return;
2423                 }
2424         }
2425 }
2426
2427 /* returns true whether we know that the client has moved from its old
2428  * originator to another one. This entry is kept is still kept for consistency
2429  * purposes
2430  */
2431 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
2432                                         uint8_t *addr)
2433 {
2434         struct batadv_tt_global_entry *tt_global_entry;
2435         bool ret = false;
2436
2437         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
2438         if (!tt_global_entry)
2439                 goto out;
2440
2441         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
2442         batadv_tt_global_entry_free_ref(tt_global_entry);
2443 out:
2444         return ret;
2445 }
2446
2447 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
2448                                           struct batadv_orig_node *orig_node,
2449                                           const unsigned char *addr)
2450 {
2451         bool ret = false;
2452
2453         if (!batadv_tt_global_add(bat_priv, orig_node, addr,
2454                                   BATADV_TT_CLIENT_TEMP,
2455                                   atomic_read(&orig_node->last_ttvn)))
2456                 goto out;
2457
2458         batadv_dbg(BATADV_DBG_TT, bat_priv,
2459                    "Added temporary global client (addr: %pM orig: %pM)\n",
2460                    addr, orig_node->orig);
2461         ret = true;
2462 out:
2463         return ret;
2464 }