net/batman-adv/translation-table.c

   1 /*
   2  * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "translation-table.h"
  24 #include "soft-interface.h"
  25 #include "hard-interface.h"
  26 #include "send.h"
  27 #include "hash.h"
  28 #include "originator.h"
  29 #include "routing.h"
  30 #include "bridge_loop_avoidance.h"
  31
  32 #include <linux/crc16.h>
  33
  34 static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
  35                           struct orig_node *orig_node);
  36 static void tt_purge(struct work_struct *work);
  37 static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry);
  38
  39 /* returns 1 if they are the same mac addr */
  40 static int compare_tt(const struct hlist_node *node, const void *data2)
  41 {
  42         const void *data1 = container_of(node, struct tt_common_entry,
  43                                          hash_entry);
  44
  45         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
  46 }
  47
  48 static void tt_start_timer(struct bat_priv *bat_priv)
  49 {
  50         INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
  51         queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work,
  52                            msecs_to_jiffies(5000));
  53 }
  54
  55 static struct tt_common_entry *tt_hash_find(struct hashtable_t *hash,
  56                                             const void *data)
  57 {
  58         struct hlist_head *head;
  59         struct hlist_node *node;
  60         struct tt_common_entry *tt_common_entry, *tt_common_entry_tmp = NULL;
  61         uint32_t index;
  62
  63         if (!hash)
  64                 return NULL;
  65
  66         index = choose_orig(data, hash->size);
  67         head = &hash->table[index];
  68
  69         rcu_read_lock();
  70         hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) {
  71                 if (!compare_eth(tt_common_entry, data))
  72                         continue;
  73
  74                 if (!atomic_inc_not_zero(&tt_common_entry->refcount))
  75                         continue;
  76
  77                 tt_common_entry_tmp = tt_common_entry;
  78                 break;
  79         }
  80         rcu_read_unlock();
  81
  82         return tt_common_entry_tmp;
  83 }
  84
  85 static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
  86                                                  const void *data)
  87 {
  88         struct tt_common_entry *tt_common_entry;
  89         struct tt_local_entry *tt_local_entry = NULL;
  90
  91         tt_common_entry = tt_hash_find(bat_priv->tt_local_hash, data);
  92         if (tt_common_entry)
  93                 tt_local_entry = container_of(tt_common_entry,
  94                                               struct tt_local_entry, common);
  95         return tt_local_entry;
  96 }
  97
  98 static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
  99                                                    const void *data)
 100 {
 101         struct tt_common_entry *tt_common_entry;
 102         struct tt_global_entry *tt_global_entry = NULL;
 103
 104         tt_common_entry = tt_hash_find(bat_priv->tt_global_hash, data);
 105         if (tt_common_entry)
 106                 tt_global_entry = container_of(tt_common_entry,
 107                                                struct tt_global_entry, common);
 108         return tt_global_entry;
 109
 110 }
 111
 112 static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
 113 {
 114         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
 115                 kfree_rcu(tt_local_entry, common.rcu);
 116 }
 117
 118 static void tt_global_entry_free_rcu(struct rcu_head *rcu)
 119 {
 120         struct tt_common_entry *tt_common_entry;
 121         struct tt_global_entry *tt_global_entry;
 122
 123         tt_common_entry = container_of(rcu, struct tt_common_entry, rcu);
 124         tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
 125                                        common);
 126
 127         kfree(tt_global_entry);
 128 }
 129
 130 static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
 131 {
 132         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 133                 tt_global_del_orig_list(tt_global_entry);
 134                 call_rcu(&tt_global_entry->common.rcu,
 135                          tt_global_entry_free_rcu);
 136         }
 137 }
 138
 139 static void tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 140 {
 141         struct tt_orig_list_entry *orig_entry;
 142
 143         orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu);
 144         atomic_dec(&orig_entry->orig_node->tt_size);
 145         orig_node_free_ref(orig_entry->orig_node);
 146         kfree(orig_entry);
 147 }
 148
 149 static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry)
 150 {
 151         call_rcu(&orig_entry->rcu, tt_orig_list_entry_free_rcu);
 152 }
 153
 154 static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
 155                            uint8_t flags)
 156 {
 157         struct tt_change_node *tt_change_node;
 158
 159         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 160
 161         if (!tt_change_node)
 162                 return;
 163
 164         tt_change_node->change.flags = flags;
 165         memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
 166
 167         spin_lock_bh(&bat_priv->tt_changes_list_lock);
 168         /* track the change in the OGMinterval list */
 169         list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
 170         atomic_inc(&bat_priv->tt_local_changes);
 171         spin_unlock_bh(&bat_priv->tt_changes_list_lock);
 172
 173         atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
 174 }
 175
 176 int tt_len(int changes_num)
 177 {
 178         return changes_num * sizeof(struct tt_change);
 179 }
 180
 181 static int tt_local_init(struct bat_priv *bat_priv)
 182 {
 183         if (bat_priv->tt_local_hash)
 184                 return 0;
 185
 186         bat_priv->tt_local_hash = hash_new(1024);
 187
 188         if (!bat_priv->tt_local_hash)
 189                 return -ENOMEM;
 190
 191         return 0;
 192 }
 193
 194 void tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 195                   int ifindex)
 196 {
 197         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 198         struct tt_local_entry *tt_local_entry = NULL;
 199         struct tt_global_entry *tt_global_entry = NULL;
 200         struct hlist_head *head;
 201         struct hlist_node *node;
 202         struct tt_orig_list_entry *orig_entry;
 203         int hash_added;
 204
 205         tt_local_entry = tt_local_hash_find(bat_priv, addr);
 206
 207         if (tt_local_entry) {
 208                 tt_local_entry->last_seen = jiffies;
 209                 /* possibly unset the TT_CLIENT_PENDING flag */
 210                 tt_local_entry->common.flags &= ~TT_CLIENT_PENDING;
 211                 goto out;
 212         }
 213
 214         tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
 215         if (!tt_local_entry)
 216                 goto out;
 217
 218         bat_dbg(DBG_TT, bat_priv,
 219                 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
 220                 (uint8_t)atomic_read(&bat_priv->ttvn));
 221
 222         memcpy(tt_local_entry->common.addr, addr, ETH_ALEN);
 223         tt_local_entry->common.flags = NO_FLAGS;
 224         if (is_wifi_iface(ifindex))
 225                 tt_local_entry->common.flags |= TT_CLIENT_WIFI;
 226         atomic_set(&tt_local_entry->common.refcount, 2);
 227         tt_local_entry->last_seen = jiffies;
 228
 229         /* the batman interface mac address should never be purged */
 230         if (compare_eth(addr, soft_iface->dev_addr))
 231                 tt_local_entry->common.flags |= TT_CLIENT_NOPURGE;
 232
 233         /* The local entry has to be marked as NEW to avoid to send it in
 234          * a full table response going out before the next ttvn increment
 235          * (consistency check) */
 236         tt_local_entry->common.flags |= TT_CLIENT_NEW;
 237
 238         hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig,
 239                          &tt_local_entry->common,
 240                          &tt_local_entry->common.hash_entry);
 241
 242         if (unlikely(hash_added != 0)) {
 243                 /* remove the reference for the hash */
 244                 tt_local_entry_free_ref(tt_local_entry);
 245                 goto out;
 246         }
 247
 248         tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
 249
 250         /* remove address from global hash if present */
 251         tt_global_entry = tt_global_hash_find(bat_priv, addr);
 252
 253         /* Check whether it is a roaming! */
 254         if (tt_global_entry) {
 255                 /* These node are probably going to update their tt table */
 256                 head = &tt_global_entry->orig_list;
 257                 rcu_read_lock();
 258                 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
 259                         orig_entry->orig_node->tt_poss_change = true;
 260
 261                         send_roam_adv(bat_priv, tt_global_entry->common.addr,
 262                                       orig_entry->orig_node);
 263                 }
 264                 rcu_read_unlock();
 265                 /* The global entry has to be marked as ROAMING and
 266                  * has to be kept for consistency purpose
 267                  */
 268                 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
 269                 tt_global_entry->roam_at = jiffies;
 270         }
 271 out:
 272         if (tt_local_entry)
 273                 tt_local_entry_free_ref(tt_local_entry);
 274         if (tt_global_entry)
 275                 tt_global_entry_free_ref(tt_global_entry);
 276 }
 277
 278 int tt_changes_fill_buffer(struct bat_priv *bat_priv,
 279                            unsigned char *buff, int buff_len)
 280 {
 281         int count = 0, tot_changes = 0;
 282         struct tt_change_node *entry, *safe;
 283
 284         if (buff_len > 0)
 285                 tot_changes = buff_len / tt_len(1);
 286
 287         spin_lock_bh(&bat_priv->tt_changes_list_lock);
 288         atomic_set(&bat_priv->tt_local_changes, 0);
 289
 290         list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
 291                                  list) {
 292                 if (count < tot_changes) {
 293                         memcpy(buff + tt_len(count),
 294                                &entry->change, sizeof(struct tt_change));
 295                         count++;
 296                 }
 297                 list_del(&entry->list);
 298                 kfree(entry);
 299         }
 300         spin_unlock_bh(&bat_priv->tt_changes_list_lock);
 301
 302         /* Keep the buffer for possible tt_request */
 303         spin_lock_bh(&bat_priv->tt_buff_lock);
 304         kfree(bat_priv->tt_buff);
 305         bat_priv->tt_buff_len = 0;
 306         bat_priv->tt_buff = NULL;
 307         /* We check whether this new OGM has no changes due to size
 308          * problems */
 309         if (buff_len > 0) {
 310                 /**
 311                  * if kmalloc() fails we will reply with the full table
 312                  * instead of providing the diff
 313                  */
 314                 bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
 315                 if (bat_priv->tt_buff) {
 316                         memcpy(bat_priv->tt_buff, buff, buff_len);
 317                         bat_priv->tt_buff_len = buff_len;
 318                 }
 319         }
 320         spin_unlock_bh(&bat_priv->tt_buff_lock);
 321
 322         return count;
 323 }
 324
 325 int tt_local_seq_print_text(struct seq_file *seq, void *offset)
 326 {
 327         struct net_device *net_dev = (struct net_device *)seq->private;
 328         struct bat_priv *bat_priv = netdev_priv(net_dev);
 329         struct hashtable_t *hash = bat_priv->tt_local_hash;
 330         struct tt_common_entry *tt_common_entry;
 331         struct hard_iface *primary_if;
 332         struct hlist_node *node;
 333         struct hlist_head *head;
 334         uint32_t i;
 335         int ret = 0;
 336
 337         primary_if = primary_if_get_selected(bat_priv);
 338         if (!primary_if) {
 339                 ret = seq_printf(seq,
 340                                  "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
 341                                  net_dev->name);
 342                 goto out;
 343         }
 344
 345         if (primary_if->if_status != IF_ACTIVE) {
 346                 ret = seq_printf(seq,
 347                                  "BATMAN mesh %s disabled - primary interface not active\n",
 348                                  net_dev->name);
 349                 goto out;
 350         }
 351
 352         seq_printf(seq,
 353                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 354                    net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
 355
 356         for (i = 0; i < hash->size; i++) {
 357                 head = &hash->table[i];
 358
 359                 rcu_read_lock();
 360                 hlist_for_each_entry_rcu(tt_common_entry, node,
 361                                          head, hash_entry) {
 362                         seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
 363                                    tt_common_entry->addr,
 364                                    (tt_common_entry->flags &
 365                                     TT_CLIENT_ROAM ? 'R' : '.'),
 366                                    (tt_common_entry->flags &
 367                                     TT_CLIENT_NOPURGE ? 'P' : '.'),
 368                                    (tt_common_entry->flags &
 369                                     TT_CLIENT_NEW ? 'N' : '.'),
 370                                    (tt_common_entry->flags &
 371                                     TT_CLIENT_PENDING ? 'X' : '.'),
 372                                    (tt_common_entry->flags &
 373                                     TT_CLIENT_WIFI ? 'W' : '.'));
 374                 }
 375                 rcu_read_unlock();
 376         }
 377 out:
 378         if (primary_if)
 379                 hardif_free_ref(primary_if);
 380         return ret;
 381 }
 382
 383 static void tt_local_set_pending(struct bat_priv *bat_priv,
 384                                  struct tt_local_entry *tt_local_entry,
 385                                  uint16_t flags, const char *message)
 386 {
 387         tt_local_event(bat_priv, tt_local_entry->common.addr,
 388                        tt_local_entry->common.flags | flags);
 389
 390         /* The local client has to be marked as "pending to be removed" but has
 391          * to be kept in the table in order to send it in a full table
 392          * response issued before the net ttvn increment (consistency check) */
 393         tt_local_entry->common.flags |= TT_CLIENT_PENDING;
 394
 395         bat_dbg(DBG_TT, bat_priv,
 396                 "Local tt entry (%pM) pending to be removed: %s\n",
 397                 tt_local_entry->common.addr, message);
 398 }
 399
 400 void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
 401                      const char *message, bool roaming)
 402 {
 403         struct tt_local_entry *tt_local_entry = NULL;
 404
 405         tt_local_entry = tt_local_hash_find(bat_priv, addr);
 406         if (!tt_local_entry)
 407                 goto out;
 408
 409         tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
 410                              (roaming ? TT_CLIENT_ROAM : NO_FLAGS), message);
 411 out:
 412         if (tt_local_entry)
 413                 tt_local_entry_free_ref(tt_local_entry);
 414 }
 415
 416 static void tt_local_purge(struct bat_priv *bat_priv)
 417 {
 418         struct hashtable_t *hash = bat_priv->tt_local_hash;
 419         struct tt_local_entry *tt_local_entry;
 420         struct tt_common_entry *tt_common_entry;
 421         struct hlist_node *node, *node_tmp;
 422         struct hlist_head *head;
 423         spinlock_t *list_lock; /* protects write access to the hash lists */
 424         uint32_t i;
 425
 426         for (i = 0; i < hash->size; i++) {
 427                 head = &hash->table[i];
 428                 list_lock = &hash->list_locks[i];
 429
 430                 spin_lock_bh(list_lock);
 431                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
 432                                           head, hash_entry) {
 433                         tt_local_entry = container_of(tt_common_entry,
 434                                                       struct tt_local_entry,
 435                                                       common);
 436                         if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE)
 437                                 continue;
 438
 439                         /* entry already marked for deletion */
 440                         if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
 441                                 continue;
 442
 443                         if (!has_timed_out(tt_local_entry->last_seen,
 444                                            TT_LOCAL_TIMEOUT))
 445                                 continue;
 446
 447                         tt_local_set_pending(bat_priv, tt_local_entry,
 448                                              TT_CLIENT_DEL, "timed out");
 449                 }
 450                 spin_unlock_bh(list_lock);
 451         }
 452
 453 }
 454
 455 static void tt_local_table_free(struct bat_priv *bat_priv)
 456 {
 457         struct hashtable_t *hash;
 458         spinlock_t *list_lock; /* protects write access to the hash lists */
 459         struct tt_common_entry *tt_common_entry;
 460         struct tt_local_entry *tt_local_entry;
 461         struct hlist_node *node, *node_tmp;
 462         struct hlist_head *head;
 463         uint32_t i;
 464
 465         if (!bat_priv->tt_local_hash)
 466                 return;
 467
 468         hash = bat_priv->tt_local_hash;
 469
 470         for (i = 0; i < hash->size; i++) {
 471                 head = &hash->table[i];
 472                 list_lock = &hash->list_locks[i];
 473
 474                 spin_lock_bh(list_lock);
 475                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
 476                                           head, hash_entry) {
 477                         hlist_del_rcu(node);
 478                         tt_local_entry = container_of(tt_common_entry,
 479                                                       struct tt_local_entry,
 480                                                       common);
 481                         tt_local_entry_free_ref(tt_local_entry);
 482                 }
 483                 spin_unlock_bh(list_lock);
 484         }
 485
 486         hash_destroy(hash);
 487
 488         bat_priv->tt_local_hash = NULL;
 489 }
 490
 491 static int tt_global_init(struct bat_priv *bat_priv)
 492 {
 493         if (bat_priv->tt_global_hash)
 494                 return 0;
 495
 496         bat_priv->tt_global_hash = hash_new(1024);
 497
 498         if (!bat_priv->tt_global_hash)
 499                 return -ENOMEM;
 500
 501         return 0;
 502 }
 503
 504 static void tt_changes_list_free(struct bat_priv *bat_priv)
 505 {
 506         struct tt_change_node *entry, *safe;
 507
 508         spin_lock_bh(&bat_priv->tt_changes_list_lock);
 509
 510         list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
 511                                  list) {
 512                 list_del(&entry->list);
 513                 kfree(entry);
 514         }
 515
 516         atomic_set(&bat_priv->tt_local_changes, 0);
 517         spin_unlock_bh(&bat_priv->tt_changes_list_lock);
 518 }
 519
 520 /* find out if an orig_node is already in the list of a tt_global_entry.
 521  * returns 1 if found, 0 otherwise
 522  */
 523 static bool tt_global_entry_has_orig(const struct tt_global_entry *entry,
 524                                      const struct orig_node *orig_node)
 525 {
 526         struct tt_orig_list_entry *tmp_orig_entry;
 527         const struct hlist_head *head;
 528         struct hlist_node *node;
 529         bool found = false;
 530
 531         rcu_read_lock();
 532         head = &entry->orig_list;
 533         hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
 534                 if (tmp_orig_entry->orig_node == orig_node) {
 535                         found = true;
 536                         break;
 537                 }
 538         }
 539         rcu_read_unlock();
 540         return found;
 541 }
 542
 543 static void tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry,
 544                                      struct orig_node *orig_node,
 545                                      int ttvn)
 546 {
 547         struct tt_orig_list_entry *orig_entry;
 548
 549         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
 550         if (!orig_entry)
 551                 return;
 552
 553         INIT_HLIST_NODE(&orig_entry->list);
 554         atomic_inc(&orig_node->refcount);
 555         atomic_inc(&orig_node->tt_size);
 556         orig_entry->orig_node = orig_node;
 557         orig_entry->ttvn = ttvn;
 558
 559         spin_lock_bh(&tt_global_entry->list_lock);
 560         hlist_add_head_rcu(&orig_entry->list,
 561                            &tt_global_entry->orig_list);
 562         spin_unlock_bh(&tt_global_entry->list_lock);
 563 }
 564
 565 /* caller must hold orig_node refcount */
 566 int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
 567                   const unsigned char *tt_addr, uint8_t ttvn, bool roaming,
 568                   bool wifi)
 569 {
 570         struct tt_global_entry *tt_global_entry = NULL;
 571         int ret = 0;
 572         int hash_added;
 573
 574         tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
 575
 576         if (!tt_global_entry) {
 577                 tt_global_entry = kzalloc(sizeof(*tt_global_entry),
 578                                           GFP_ATOMIC);
 579                 if (!tt_global_entry)
 580                         goto out;
 581
 582                 memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN);
 583
 584                 tt_global_entry->common.flags = NO_FLAGS;
 585                 tt_global_entry->roam_at = 0;
 586                 atomic_set(&tt_global_entry->common.refcount, 2);
 587
 588                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
 589                 spin_lock_init(&tt_global_entry->list_lock);
 590
 591                 hash_added = hash_add(bat_priv->tt_global_hash, compare_tt,
 592                                  choose_orig, &tt_global_entry->common,
 593                                  &tt_global_entry->common.hash_entry);
 594
 595                 if (unlikely(hash_added != 0)) {
 596                         /* remove the reference for the hash */
 597                         tt_global_entry_free_ref(tt_global_entry);
 598                         goto out_remove;
 599                 }
 600
 601                 tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn);
 602         } else {
 603                 /* there is already a global entry, use this one. */
 604
 605                 /* If there is the TT_CLIENT_ROAM flag set, there is only one
 606                  * originator left in the list and we previously received a
 607                  * delete + roaming change for this originator.
 608                  *
 609                  * We should first delete the old originator before adding the
 610                  * new one.
 611                  */
 612                 if (tt_global_entry->common.flags & TT_CLIENT_ROAM) {
 613                         tt_global_del_orig_list(tt_global_entry);
 614                         tt_global_entry->common.flags &= ~TT_CLIENT_ROAM;
 615                         tt_global_entry->roam_at = 0;
 616                 }
 617
 618                 if (!tt_global_entry_has_orig(tt_global_entry, orig_node))
 619                         tt_global_add_orig_entry(tt_global_entry, orig_node,
 620                                                  ttvn);
 621         }
 622
 623         if (wifi)
 624                 tt_global_entry->common.flags |= TT_CLIENT_WIFI;
 625
 626         bat_dbg(DBG_TT, bat_priv,
 627                 "Creating new global tt entry: %pM (via %pM)\n",
 628                 tt_global_entry->common.addr, orig_node->orig);
 629
 630 out_remove:
 631         /* remove address from local hash if present */
 632         tt_local_remove(bat_priv, tt_global_entry->common.addr,
 633                         "global tt received", roaming);
 634         ret = 1;
 635 out:
 636         if (tt_global_entry)
 637                 tt_global_entry_free_ref(tt_global_entry);
 638         return ret;
 639 }
 640
 641 /* print all orig nodes who announce the address for this global entry.
 642  * it is assumed that the caller holds rcu_read_lock();
 643  */
 644 static void tt_global_print_entry(struct tt_global_entry *tt_global_entry,
 645                                   struct seq_file *seq)
 646 {
 647         struct hlist_head *head;
 648         struct hlist_node *node;
 649         struct tt_orig_list_entry *orig_entry;
 650         struct tt_common_entry *tt_common_entry;
 651         uint16_t flags;
 652         uint8_t last_ttvn;
 653
 654         tt_common_entry = &tt_global_entry->common;
 655
 656         head = &tt_global_entry->orig_list;
 657
 658         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
 659                 flags = tt_common_entry->flags;
 660                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
 661                 seq_printf(seq, " * %pM  (%3u) via %pM     (%3u)   [%c%c]\n",
 662                            tt_global_entry->common.addr, orig_entry->ttvn,
 663                            orig_entry->orig_node->orig, last_ttvn,
 664                            (flags & TT_CLIENT_ROAM ? 'R' : '.'),
 665                            (flags & TT_CLIENT_WIFI ? 'W' : '.'));
 666         }
 667 }
 668
 669 int tt_global_seq_print_text(struct seq_file *seq, void *offset)
 670 {
 671         struct net_device *net_dev = (struct net_device *)seq->private;
 672         struct bat_priv *bat_priv = netdev_priv(net_dev);
 673         struct hashtable_t *hash = bat_priv->tt_global_hash;
 674         struct tt_common_entry *tt_common_entry;
 675         struct tt_global_entry *tt_global_entry;
 676         struct hard_iface *primary_if;
 677         struct hlist_node *node;
 678         struct hlist_head *head;
 679         uint32_t i;
 680         int ret = 0;
 681
 682         primary_if = primary_if_get_selected(bat_priv);
 683         if (!primary_if) {
 684                 ret = seq_printf(seq,
 685                                  "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
 686                                  net_dev->name);
 687                 goto out;
 688         }
 689
 690         if (primary_if->if_status != IF_ACTIVE) {
 691                 ret = seq_printf(seq,
 692                                  "BATMAN mesh %s disabled - primary interface not active\n",
 693                                  net_dev->name);
 694                 goto out;
 695         }
 696
 697         seq_printf(seq,
 698                    "Globally announced TT entries received via the mesh %s\n",
 699                    net_dev->name);
 700         seq_printf(seq, "       %-13s %s       %-15s %s %s\n",
 701                    "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
 702
 703         for (i = 0; i < hash->size; i++) {
 704                 head = &hash->table[i];
 705
 706                 rcu_read_lock();
 707                 hlist_for_each_entry_rcu(tt_common_entry, node,
 708                                          head, hash_entry) {
 709                         tt_global_entry = container_of(tt_common_entry,
 710                                                        struct tt_global_entry,
 711                                                        common);
 712                         tt_global_print_entry(tt_global_entry, seq);
 713                 }
 714                 rcu_read_unlock();
 715         }
 716 out:
 717         if (primary_if)
 718                 hardif_free_ref(primary_if);
 719         return ret;
 720 }
 721
 722 /* deletes the orig list of a tt_global_entry */
 723 static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry)
 724 {
 725         struct hlist_head *head;
 726         struct hlist_node *node, *safe;
 727         struct tt_orig_list_entry *orig_entry;
 728
 729         spin_lock_bh(&tt_global_entry->list_lock);
 730         head = &tt_global_entry->orig_list;
 731         hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
 732                 hlist_del_rcu(node);
 733                 tt_orig_list_entry_free_ref(orig_entry);
 734         }
 735         spin_unlock_bh(&tt_global_entry->list_lock);
 736
 737 }
 738
 739 static void tt_global_del_orig_entry(struct bat_priv *bat_priv,
 740                                      struct tt_global_entry *tt_global_entry,
 741                                      struct orig_node *orig_node,
 742                                      const char *message)
 743 {
 744         struct hlist_head *head;
 745         struct hlist_node *node, *safe;
 746         struct tt_orig_list_entry *orig_entry;
 747
 748         spin_lock_bh(&tt_global_entry->list_lock);
 749         head = &tt_global_entry->orig_list;
 750         hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
 751                 if (orig_entry->orig_node == orig_node) {
 752                         bat_dbg(DBG_TT, bat_priv,
 753                                 "Deleting %pM from global tt entry %pM: %s\n",
 754                                 orig_node->orig, tt_global_entry->common.addr,
 755                                 message);
 756                         hlist_del_rcu(node);
 757                         tt_orig_list_entry_free_ref(orig_entry);
 758                 }
 759         }
 760         spin_unlock_bh(&tt_global_entry->list_lock);
 761 }
 762
 763 static void tt_global_del_struct(struct bat_priv *bat_priv,
 764                                  struct tt_global_entry *tt_global_entry,
 765                                  const char *message)
 766 {
 767         bat_dbg(DBG_TT, bat_priv,
 768                 "Deleting global tt entry %pM: %s\n",
 769                 tt_global_entry->common.addr, message);
 770
 771         hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig,
 772                     tt_global_entry->common.addr);
 773         tt_global_entry_free_ref(tt_global_entry);
 774
 775 }
 776
 777 /* If the client is to be deleted, we check if it is the last origantor entry
 778  * within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer,
 779  * otherwise we simply remove the originator scheduled for deletion.
 780  */
 781 static void tt_global_del_roaming(struct bat_priv *bat_priv,
 782                                   struct tt_global_entry *tt_global_entry,
 783                                   struct orig_node *orig_node,
 784                                   const char *message)
 785 {
 786         bool last_entry = true;
 787         struct hlist_head *head;
 788         struct hlist_node *node;
 789         struct tt_orig_list_entry *orig_entry;
 790
 791         /* no local entry exists, case 1:
 792          * Check if this is the last one or if other entries exist.
 793          */
 794
 795         rcu_read_lock();
 796         head = &tt_global_entry->orig_list;
 797         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
 798                 if (orig_entry->orig_node != orig_node) {
 799                         last_entry = false;
 800                         break;
 801                 }
 802         }
 803         rcu_read_unlock();
 804
 805         if (last_entry) {
 806                 /* its the last one, mark for roaming. */
 807                 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
 808                 tt_global_entry->roam_at = jiffies;
 809         } else
 810                 /* there is another entry, we can simply delete this
 811                  * one and can still use the other one.
 812                  */
 813                 tt_global_del_orig_entry(bat_priv, tt_global_entry,
 814                                          orig_node, message);
 815 }
 816
 817
 818
 819 static void tt_global_del(struct bat_priv *bat_priv,
 820                           struct orig_node *orig_node,
 821                           const unsigned char *addr,
 822                           const char *message, bool roaming)
 823 {
 824         struct tt_global_entry *tt_global_entry = NULL;
 825         struct tt_local_entry *tt_local_entry = NULL;
 826
 827         tt_global_entry = tt_global_hash_find(bat_priv, addr);
 828         if (!tt_global_entry)
 829                 goto out;
 830
 831         if (!roaming) {
 832                 tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node,
 833                                          message);
 834
 835                 if (hlist_empty(&tt_global_entry->orig_list))
 836                         tt_global_del_struct(bat_priv, tt_global_entry,
 837                                              message);
 838
 839                 goto out;
 840         }
 841
 842         /* if we are deleting a global entry due to a roam
 843          * event, there are two possibilities:
 844          * 1) the client roamed from node A to node B => if there
 845          *    is only one originator left for this client, we mark
 846          *    it with TT_CLIENT_ROAM, we start a timer and we
 847          *    wait for node B to claim it. In case of timeout
 848          *    the entry is purged.
 849          *
 850          *    If there are other originators left, we directly delete
 851          *    the originator.
 852          * 2) the client roamed to us => we can directly delete
 853          *    the global entry, since it is useless now. */
 854
 855         tt_local_entry = tt_local_hash_find(bat_priv,
 856                                             tt_global_entry->common.addr);
 857         if (tt_local_entry) {
 858                 /* local entry exists, case 2: client roamed to us. */
 859                 tt_global_del_orig_list(tt_global_entry);
 860                 tt_global_del_struct(bat_priv, tt_global_entry, message);
 861         } else
 862                 /* no local entry exists, case 1: check for roaming */
 863                 tt_global_del_roaming(bat_priv, tt_global_entry, orig_node,
 864                                       message);
 865
 866
 867 out:
 868         if (tt_global_entry)
 869                 tt_global_entry_free_ref(tt_global_entry);
 870         if (tt_local_entry)
 871                 tt_local_entry_free_ref(tt_local_entry);
 872 }
 873
 874 void tt_global_del_orig(struct bat_priv *bat_priv,
 875                         struct orig_node *orig_node, const char *message)
 876 {
 877         struct tt_global_entry *tt_global_entry;
 878         struct tt_common_entry *tt_common_entry;
 879         uint32_t i;
 880         struct hashtable_t *hash = bat_priv->tt_global_hash;
 881         struct hlist_node *node, *safe;
 882         struct hlist_head *head;
 883         spinlock_t *list_lock; /* protects write access to the hash lists */
 884
 885         if (!hash)
 886                 return;
 887
 888         for (i = 0; i < hash->size; i++) {
 889                 head = &hash->table[i];
 890                 list_lock = &hash->list_locks[i];
 891
 892                 spin_lock_bh(list_lock);
 893                 hlist_for_each_entry_safe(tt_common_entry, node, safe,
 894                                           head, hash_entry) {
 895                         tt_global_entry = container_of(tt_common_entry,
 896                                                        struct tt_global_entry,
 897                                                        common);
 898
 899                         tt_global_del_orig_entry(bat_priv, tt_global_entry,
 900                                                  orig_node, message);
 901
 902                         if (hlist_empty(&tt_global_entry->orig_list)) {
 903                                 bat_dbg(DBG_TT, bat_priv,
 904                                         "Deleting global tt entry %pM: %s\n",
 905                                         tt_global_entry->common.addr,
 906                                         message);
 907                                 hlist_del_rcu(node);
 908                                 tt_global_entry_free_ref(tt_global_entry);
 909                         }
 910                 }
 911                 spin_unlock_bh(list_lock);
 912         }
 913         atomic_set(&orig_node->tt_size, 0);
 914         orig_node->tt_initialised = false;
 915 }
 916
 917 static void tt_global_roam_purge(struct bat_priv *bat_priv)
 918 {
 919         struct hashtable_t *hash = bat_priv->tt_global_hash;
 920         struct tt_common_entry *tt_common_entry;
 921         struct tt_global_entry *tt_global_entry;
 922         struct hlist_node *node, *node_tmp;
 923         struct hlist_head *head;
 924         spinlock_t *list_lock; /* protects write access to the hash lists */
 925         uint32_t i;
 926
 927         for (i = 0; i < hash->size; i++) {
 928                 head = &hash->table[i];
 929                 list_lock = &hash->list_locks[i];
 930
 931                 spin_lock_bh(list_lock);
 932                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
 933                                           head, hash_entry) {
 934                         tt_global_entry = container_of(tt_common_entry,
 935                                                        struct tt_global_entry,
 936                                                        common);
 937                         if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM))
 938                                 continue;
 939                         if (!has_timed_out(tt_global_entry->roam_at,
 940                                            TT_CLIENT_ROAM_TIMEOUT))
 941                                 continue;
 942
 943                         bat_dbg(DBG_TT, bat_priv,
 944                                 "Deleting global tt entry (%pM): Roaming timeout\n",
 945                                 tt_global_entry->common.addr);
 946
 947                         hlist_del_rcu(node);
 948                         tt_global_entry_free_ref(tt_global_entry);
 949                 }
 950                 spin_unlock_bh(list_lock);
 951         }
 952
 953 }
 954
 955 static void tt_global_table_free(struct bat_priv *bat_priv)
 956 {
 957         struct hashtable_t *hash;
 958         spinlock_t *list_lock; /* protects write access to the hash lists */
 959         struct tt_common_entry *tt_common_entry;
 960         struct tt_global_entry *tt_global_entry;
 961         struct hlist_node *node, *node_tmp;
 962         struct hlist_head *head;
 963         uint32_t i;
 964
 965         if (!bat_priv->tt_global_hash)
 966                 return;
 967
 968         hash = bat_priv->tt_global_hash;
 969
 970         for (i = 0; i < hash->size; i++) {
 971                 head = &hash->table[i];
 972                 list_lock = &hash->list_locks[i];
 973
 974                 spin_lock_bh(list_lock);
 975                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
 976                                           head, hash_entry) {
 977                         hlist_del_rcu(node);
 978                         tt_global_entry = container_of(tt_common_entry,
 979                                                        struct tt_global_entry,
 980                                                        common);
 981                         tt_global_entry_free_ref(tt_global_entry);
 982                 }
 983                 spin_unlock_bh(list_lock);
 984         }
 985
 986         hash_destroy(hash);
 987
 988         bat_priv->tt_global_hash = NULL;
 989 }
 990
 991 static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
 992                             struct tt_global_entry *tt_global_entry)
 993 {
 994         bool ret = false;
 995
 996         if (tt_local_entry->common.flags & TT_CLIENT_WIFI &&
 997             tt_global_entry->common.flags & TT_CLIENT_WIFI)
 998                 ret = true;
 999
1000         return ret;
1001 }
1002
1003 struct orig_node *transtable_search(struct bat_priv *bat_priv,
1004                                     const uint8_t *src, const uint8_t *addr)
1005 {
1006         struct tt_local_entry *tt_local_entry = NULL;
1007         struct tt_global_entry *tt_global_entry = NULL;
1008         struct orig_node *orig_node = NULL;
1009         struct neigh_node *router = NULL;
1010         struct hlist_head *head;
1011         struct hlist_node *node;
1012         struct tt_orig_list_entry *orig_entry;
1013         int best_tq;
1014
1015         if (src && atomic_read(&bat_priv->ap_isolation)) {
1016                 tt_local_entry = tt_local_hash_find(bat_priv, src);
1017                 if (!tt_local_entry)
1018                         goto out;
1019         }
1020
1021         tt_global_entry = tt_global_hash_find(bat_priv, addr);
1022         if (!tt_global_entry)
1023                 goto out;
1024
1025         /* check whether the clients should not communicate due to AP
1026          * isolation */
1027         if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
1028                 goto out;
1029
1030         best_tq = 0;
1031
1032         rcu_read_lock();
1033         head = &tt_global_entry->orig_list;
1034         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
1035                 router = orig_node_get_router(orig_entry->orig_node);
1036                 if (!router)
1037                         continue;
1038
1039                 if (router->tq_avg > best_tq) {
1040                         orig_node = orig_entry->orig_node;
1041                         best_tq = router->tq_avg;
1042                 }
1043                 neigh_node_free_ref(router);
1044         }
1045         /* found anything? */
1046         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1047                 orig_node = NULL;
1048         rcu_read_unlock();
1049 out:
1050         if (tt_global_entry)
1051                 tt_global_entry_free_ref(tt_global_entry);
1052         if (tt_local_entry)
1053                 tt_local_entry_free_ref(tt_local_entry);
1054
1055         return orig_node;
1056 }
1057
1058 /* Calculates the checksum of the local table of a given orig_node */
1059 static uint16_t tt_global_crc(struct bat_priv *bat_priv,
1060                               struct orig_node *orig_node)
1061 {
1062         uint16_t total = 0, total_one;
1063         struct hashtable_t *hash = bat_priv->tt_global_hash;
1064         struct tt_common_entry *tt_common_entry;
1065         struct tt_global_entry *tt_global_entry;
1066         struct hlist_node *node;
1067         struct hlist_head *head;
1068         uint32_t i;
1069         int j;
1070
1071         for (i = 0; i < hash->size; i++) {
1072                 head = &hash->table[i];
1073
1074                 rcu_read_lock();
1075                 hlist_for_each_entry_rcu(tt_common_entry, node,
1076                                          head, hash_entry) {
1077                         tt_global_entry = container_of(tt_common_entry,
1078                                                        struct tt_global_entry,
1079                                                        common);
1080                         /* Roaming clients are in the global table for
1081                          * consistency only. They don't have to be
1082                          * taken into account while computing the
1083                          * global crc
1084                          */
1085                         if (tt_global_entry->common.flags & TT_CLIENT_ROAM)
1086                                 continue;
1087
1088                         /* find out if this global entry is announced by this
1089                          * originator
1090                          */
1091                         if (!tt_global_entry_has_orig(tt_global_entry,
1092                                                       orig_node))
1093                                 continue;
1094
1095                         total_one = 0;
1096                         for (j = 0; j < ETH_ALEN; j++)
1097                                 total_one = crc16_byte(total_one,
1098                                         tt_global_entry->common.addr[j]);
1099                         total ^= total_one;
1100                 }
1101                 rcu_read_unlock();
1102         }
1103
1104         return total;
1105 }
1106
1107 /* Calculates the checksum of the local table */
1108 uint16_t tt_local_crc(struct bat_priv *bat_priv)
1109 {
1110         uint16_t total = 0, total_one;
1111         struct hashtable_t *hash = bat_priv->tt_local_hash;
1112         struct tt_common_entry *tt_common_entry;
1113         struct hlist_node *node;
1114         struct hlist_head *head;
1115         uint32_t i;
1116         int j;
1117
1118         for (i = 0; i < hash->size; i++) {
1119                 head = &hash->table[i];
1120
1121                 rcu_read_lock();
1122                 hlist_for_each_entry_rcu(tt_common_entry, node,
1123                                          head, hash_entry) {
1124                         /* not yet committed clients have not to be taken into
1125                          * account while computing the CRC */
1126                         if (tt_common_entry->flags & TT_CLIENT_NEW)
1127                                 continue;
1128                         total_one = 0;
1129                         for (j = 0; j < ETH_ALEN; j++)
1130                                 total_one = crc16_byte(total_one,
1131                                                    tt_common_entry->addr[j]);
1132                         total ^= total_one;
1133                 }
1134                 rcu_read_unlock();
1135         }
1136
1137         return total;
1138 }
1139
1140 static void tt_req_list_free(struct bat_priv *bat_priv)
1141 {
1142         struct tt_req_node *node, *safe;
1143
1144         spin_lock_bh(&bat_priv->tt_req_list_lock);
1145
1146         list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1147                 list_del(&node->list);
1148                 kfree(node);
1149         }
1150
1151         spin_unlock_bh(&bat_priv->tt_req_list_lock);
1152 }
1153
1154 static void tt_save_orig_buffer(struct bat_priv *bat_priv,
1155                                 struct orig_node *orig_node,
1156                                 const unsigned char *tt_buff,
1157                                 uint8_t tt_num_changes)
1158 {
1159         uint16_t tt_buff_len = tt_len(tt_num_changes);
1160
1161         /* Replace the old buffer only if I received something in the
1162          * last OGM (the OGM could carry no changes) */
1163         spin_lock_bh(&orig_node->tt_buff_lock);
1164         if (tt_buff_len > 0) {
1165                 kfree(orig_node->tt_buff);
1166                 orig_node->tt_buff_len = 0;
1167                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
1168                 if (orig_node->tt_buff) {
1169                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
1170                         orig_node->tt_buff_len = tt_buff_len;
1171                 }
1172         }
1173         spin_unlock_bh(&orig_node->tt_buff_lock);
1174 }
1175
1176 static void tt_req_purge(struct bat_priv *bat_priv)
1177 {
1178         struct tt_req_node *node, *safe;
1179
1180         spin_lock_bh(&bat_priv->tt_req_list_lock);
1181         list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1182                 if (has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) {
1183                         list_del(&node->list);
1184                         kfree(node);
1185                 }
1186         }
1187         spin_unlock_bh(&bat_priv->tt_req_list_lock);
1188 }
1189
1190 /* returns the pointer to the new tt_req_node struct if no request
1191  * has already been issued for this orig_node, NULL otherwise */
1192 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
1193                                           struct orig_node *orig_node)
1194 {
1195         struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
1196
1197         spin_lock_bh(&bat_priv->tt_req_list_lock);
1198         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
1199                 if (compare_eth(tt_req_node_tmp, orig_node) &&
1200                     !has_timed_out(tt_req_node_tmp->issued_at,
1201                                    TT_REQUEST_TIMEOUT))
1202                         goto unlock;
1203         }
1204
1205         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1206         if (!tt_req_node)
1207                 goto unlock;
1208
1209         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1210         tt_req_node->issued_at = jiffies;
1211
1212         list_add(&tt_req_node->list, &bat_priv->tt_req_list);
1213 unlock:
1214         spin_unlock_bh(&bat_priv->tt_req_list_lock);
1215         return tt_req_node;
1216 }
1217
1218 /* data_ptr is useless here, but has to be kept to respect the prototype */
1219 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
1220 {
1221         const struct tt_common_entry *tt_common_entry = entry_ptr;
1222
1223         if (tt_common_entry->flags & TT_CLIENT_NEW)
1224                 return 0;
1225         return 1;
1226 }
1227
1228 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
1229 {
1230         const struct tt_common_entry *tt_common_entry = entry_ptr;
1231         const struct tt_global_entry *tt_global_entry;
1232         const struct orig_node *orig_node = data_ptr;
1233
1234         if (tt_common_entry->flags & TT_CLIENT_ROAM)
1235                 return 0;
1236
1237         tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
1238                                        common);
1239
1240         return tt_global_entry_has_orig(tt_global_entry, orig_node);
1241 }
1242
1243 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1244                                               struct hashtable_t *hash,
1245                                               struct hard_iface *primary_if,
1246                                               int (*valid_cb)(const void *,
1247                                                               const void *),
1248                                               void *cb_data)
1249 {
1250         struct tt_common_entry *tt_common_entry;
1251         struct tt_query_packet *tt_response;
1252         struct tt_change *tt_change;
1253         struct hlist_node *node;
1254         struct hlist_head *head;
1255         struct sk_buff *skb = NULL;
1256         uint16_t tt_tot, tt_count;
1257         ssize_t tt_query_size = sizeof(struct tt_query_packet);
1258         uint32_t i;
1259
1260         if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1261                 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1262                 tt_len -= tt_len % sizeof(struct tt_change);
1263         }
1264         tt_tot = tt_len / sizeof(struct tt_change);
1265
1266         skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1267         if (!skb)
1268                 goto out;
1269
1270         skb_reserve(skb, ETH_HLEN);
1271         tt_response = (struct tt_query_packet *)skb_put(skb,
1272                                                      tt_query_size + tt_len);
1273         tt_response->ttvn = ttvn;
1274
1275         tt_change = (struct tt_change *)(skb->data + tt_query_size);
1276         tt_count = 0;
1277
1278         rcu_read_lock();
1279         for (i = 0; i < hash->size; i++) {
1280                 head = &hash->table[i];
1281
1282                 hlist_for_each_entry_rcu(tt_common_entry, node,
1283                                          head, hash_entry) {
1284                         if (tt_count == tt_tot)
1285                                 break;
1286
1287                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
1288                                 continue;
1289
1290                         memcpy(tt_change->addr, tt_common_entry->addr,
1291                                ETH_ALEN);
1292                         tt_change->flags = NO_FLAGS;
1293
1294                         tt_count++;
1295                         tt_change++;
1296                 }
1297         }
1298         rcu_read_unlock();
1299
1300         /* store in the message the number of entries we have successfully
1301          * copied */
1302         tt_response->tt_data = htons(tt_count);
1303
1304 out:
1305         return skb;
1306 }
1307
1308 static int send_tt_request(struct bat_priv *bat_priv,
1309                            struct orig_node *dst_orig_node,
1310                            uint8_t ttvn, uint16_t tt_crc, bool full_table)
1311 {
1312         struct sk_buff *skb = NULL;
1313         struct tt_query_packet *tt_request;
1314         struct neigh_node *neigh_node = NULL;
1315         struct hard_iface *primary_if;
1316         struct tt_req_node *tt_req_node = NULL;
1317         int ret = 1;
1318
1319         primary_if = primary_if_get_selected(bat_priv);
1320         if (!primary_if)
1321                 goto out;
1322
1323         /* The new tt_req will be issued only if I'm not waiting for a
1324          * reply from the same orig_node yet */
1325         tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1326         if (!tt_req_node)
1327                 goto out;
1328
1329         skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1330         if (!skb)
1331                 goto out;
1332
1333         skb_reserve(skb, ETH_HLEN);
1334
1335         tt_request = (struct tt_query_packet *)skb_put(skb,
1336                                 sizeof(struct tt_query_packet));
1337
1338         tt_request->header.packet_type = BAT_TT_QUERY;
1339         tt_request->header.version = COMPAT_VERSION;
1340         memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1341         memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1342         tt_request->header.ttl = TTL;
1343         tt_request->ttvn = ttvn;
1344         tt_request->tt_data = htons(tt_crc);
1345         tt_request->flags = TT_REQUEST;
1346
1347         if (full_table)
1348                 tt_request->flags |= TT_FULL_TABLE;
1349
1350         neigh_node = orig_node_get_router(dst_orig_node);
1351         if (!neigh_node)
1352                 goto out;
1353
1354         bat_dbg(DBG_TT, bat_priv,
1355                 "Sending TT_REQUEST to %pM via %pM [%c]\n",
1356                 dst_orig_node->orig, neigh_node->addr,
1357                 (full_table ? 'F' : '.'));
1358
1359         batadv_inc_counter(bat_priv, BAT_CNT_TT_REQUEST_TX);
1360
1361         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1362         ret = 0;
1363
1364 out:
1365         if (neigh_node)
1366                 neigh_node_free_ref(neigh_node);
1367         if (primary_if)
1368                 hardif_free_ref(primary_if);
1369         if (ret)
1370                 kfree_skb(skb);
1371         if (ret && tt_req_node) {
1372                 spin_lock_bh(&bat_priv->tt_req_list_lock);
1373                 list_del(&tt_req_node->list);
1374                 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1375                 kfree(tt_req_node);
1376         }
1377         return ret;
1378 }
1379
1380 static bool send_other_tt_response(struct bat_priv *bat_priv,
1381                                    struct tt_query_packet *tt_request)
1382 {
1383         struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1384         struct neigh_node *neigh_node = NULL;
1385         struct hard_iface *primary_if = NULL;
1386         uint8_t orig_ttvn, req_ttvn, ttvn;
1387         int ret = false;
1388         unsigned char *tt_buff;
1389         bool full_table;
1390         uint16_t tt_len, tt_tot;
1391         struct sk_buff *skb = NULL;
1392         struct tt_query_packet *tt_response;
1393
1394         bat_dbg(DBG_TT, bat_priv,
1395                 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1396                 tt_request->src, tt_request->ttvn, tt_request->dst,
1397                 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1398
1399         /* Let's get the orig node of the REAL destination */
1400         req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst);
1401         if (!req_dst_orig_node)
1402                 goto out;
1403
1404         res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src);
1405         if (!res_dst_orig_node)
1406                 goto out;
1407
1408         neigh_node = orig_node_get_router(res_dst_orig_node);
1409         if (!neigh_node)
1410                 goto out;
1411
1412         primary_if = primary_if_get_selected(bat_priv);
1413         if (!primary_if)
1414                 goto out;
1415
1416         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1417         req_ttvn = tt_request->ttvn;
1418
1419         /* I don't have the requested data */
1420         if (orig_ttvn != req_ttvn ||
1421             tt_request->tt_data != req_dst_orig_node->tt_crc)
1422                 goto out;
1423
1424         /* If the full table has been explicitly requested */
1425         if (tt_request->flags & TT_FULL_TABLE ||
1426             !req_dst_orig_node->tt_buff)
1427                 full_table = true;
1428         else
1429                 full_table = false;
1430
1431         /* In this version, fragmentation is not implemented, then
1432          * I'll send only one packet with as much TT entries as I can */
1433         if (!full_table) {
1434                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1435                 tt_len = req_dst_orig_node->tt_buff_len;
1436                 tt_tot = tt_len / sizeof(struct tt_change);
1437
1438                 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1439                                     tt_len + ETH_HLEN);
1440                 if (!skb)
1441                         goto unlock;
1442
1443                 skb_reserve(skb, ETH_HLEN);
1444                 tt_response = (struct tt_query_packet *)skb_put(skb,
1445                                 sizeof(struct tt_query_packet) + tt_len);
1446                 tt_response->ttvn = req_ttvn;
1447                 tt_response->tt_data = htons(tt_tot);
1448
1449                 tt_buff = skb->data + sizeof(struct tt_query_packet);
1450                 /* Copy the last orig_node's OGM buffer */
1451                 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1452                        req_dst_orig_node->tt_buff_len);
1453
1454                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1455         } else {
1456                 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1457                                                 sizeof(struct tt_change);
1458                 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1459
1460                 skb = tt_response_fill_table(tt_len, ttvn,
1461                                              bat_priv->tt_global_hash,
1462                                              primary_if, tt_global_valid_entry,
1463                                              req_dst_orig_node);
1464                 if (!skb)
1465                         goto out;
1466
1467                 tt_response = (struct tt_query_packet *)skb->data;
1468         }
1469
1470         tt_response->header.packet_type = BAT_TT_QUERY;
1471         tt_response->header.version = COMPAT_VERSION;
1472         tt_response->header.ttl = TTL;
1473         memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1474         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1475         tt_response->flags = TT_RESPONSE;
1476
1477         if (full_table)
1478                 tt_response->flags |= TT_FULL_TABLE;
1479
1480         bat_dbg(DBG_TT, bat_priv,
1481                 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1482                 res_dst_orig_node->orig, neigh_node->addr,
1483                 req_dst_orig_node->orig, req_ttvn);
1484
1485         batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX);
1486
1487         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1488         ret = true;
1489         goto out;
1490
1491 unlock:
1492         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1493
1494 out:
1495         if (res_dst_orig_node)
1496                 orig_node_free_ref(res_dst_orig_node);
1497         if (req_dst_orig_node)
1498                 orig_node_free_ref(req_dst_orig_node);
1499         if (neigh_node)
1500                 neigh_node_free_ref(neigh_node);
1501         if (primary_if)
1502                 hardif_free_ref(primary_if);
1503         if (!ret)
1504                 kfree_skb(skb);
1505         return ret;
1506
1507 }
1508 static bool send_my_tt_response(struct bat_priv *bat_priv,
1509                                 struct tt_query_packet *tt_request)
1510 {
1511         struct orig_node *orig_node = NULL;
1512         struct neigh_node *neigh_node = NULL;
1513         struct hard_iface *primary_if = NULL;
1514         uint8_t my_ttvn, req_ttvn, ttvn;
1515         int ret = false;
1516         unsigned char *tt_buff;
1517         bool full_table;
1518         uint16_t tt_len, tt_tot;
1519         struct sk_buff *skb = NULL;
1520         struct tt_query_packet *tt_response;
1521
1522         bat_dbg(DBG_TT, bat_priv,
1523                 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1524                 tt_request->src, tt_request->ttvn,
1525                 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1526
1527
1528         my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1529         req_ttvn = tt_request->ttvn;
1530
1531         orig_node = orig_hash_find(bat_priv, tt_request->src);
1532         if (!orig_node)
1533                 goto out;
1534
1535         neigh_node = orig_node_get_router(orig_node);
1536         if (!neigh_node)
1537                 goto out;
1538
1539         primary_if = primary_if_get_selected(bat_priv);
1540         if (!primary_if)
1541                 goto out;
1542
1543         /* If the full table has been explicitly requested or the gap
1544          * is too big send the whole local translation table */
1545         if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1546             !bat_priv->tt_buff)
1547                 full_table = true;
1548         else
1549                 full_table = false;
1550
1551         /* In this version, fragmentation is not implemented, then
1552          * I'll send only one packet with as much TT entries as I can */
1553         if (!full_table) {
1554                 spin_lock_bh(&bat_priv->tt_buff_lock);
1555                 tt_len = bat_priv->tt_buff_len;
1556                 tt_tot = tt_len / sizeof(struct tt_change);
1557
1558                 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1559                                     tt_len + ETH_HLEN);
1560                 if (!skb)
1561                         goto unlock;
1562
1563                 skb_reserve(skb, ETH_HLEN);
1564                 tt_response = (struct tt_query_packet *)skb_put(skb,
1565                                 sizeof(struct tt_query_packet) + tt_len);
1566                 tt_response->ttvn = req_ttvn;
1567                 tt_response->tt_data = htons(tt_tot);
1568
1569                 tt_buff = skb->data + sizeof(struct tt_query_packet);
1570                 memcpy(tt_buff, bat_priv->tt_buff,
1571                        bat_priv->tt_buff_len);
1572                 spin_unlock_bh(&bat_priv->tt_buff_lock);
1573         } else {
1574                 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1575                                                 sizeof(struct tt_change);
1576                 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1577
1578                 skb = tt_response_fill_table(tt_len, ttvn,
1579                                              bat_priv->tt_local_hash,
1580                                              primary_if, tt_local_valid_entry,
1581                                              NULL);
1582                 if (!skb)
1583                         goto out;
1584
1585                 tt_response = (struct tt_query_packet *)skb->data;
1586         }
1587
1588         tt_response->header.packet_type = BAT_TT_QUERY;
1589         tt_response->header.version = COMPAT_VERSION;
1590         tt_response->header.ttl = TTL;
1591         memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1592         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1593         tt_response->flags = TT_RESPONSE;
1594
1595         if (full_table)
1596                 tt_response->flags |= TT_FULL_TABLE;
1597
1598         bat_dbg(DBG_TT, bat_priv,
1599                 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1600                 orig_node->orig, neigh_node->addr,
1601                 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1602
1603         batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX);
1604
1605         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1606         ret = true;
1607         goto out;
1608
1609 unlock:
1610         spin_unlock_bh(&bat_priv->tt_buff_lock);
1611 out:
1612         if (orig_node)
1613                 orig_node_free_ref(orig_node);
1614         if (neigh_node)
1615                 neigh_node_free_ref(neigh_node);
1616         if (primary_if)
1617                 hardif_free_ref(primary_if);
1618         if (!ret)
1619                 kfree_skb(skb);
1620         /* This packet was for me, so it doesn't need to be re-routed */
1621         return true;
1622 }
1623
1624 bool send_tt_response(struct bat_priv *bat_priv,
1625                       struct tt_query_packet *tt_request)
1626 {
1627         if (is_my_mac(tt_request->dst)) {
1628                 /* don't answer backbone gws! */
1629                 if (bla_is_backbone_gw_orig(bat_priv, tt_request->src))
1630                         return true;
1631
1632                 return send_my_tt_response(bat_priv, tt_request);
1633         } else {
1634                 return send_other_tt_response(bat_priv, tt_request);
1635         }
1636 }
1637
1638 static void _tt_update_changes(struct bat_priv *bat_priv,
1639                                struct orig_node *orig_node,
1640                                struct tt_change *tt_change,
1641                                uint16_t tt_num_changes, uint8_t ttvn)
1642 {
1643         int i;
1644
1645         for (i = 0; i < tt_num_changes; i++) {
1646                 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1647                         tt_global_del(bat_priv, orig_node,
1648                                       (tt_change + i)->addr,
1649                                       "tt removed by changes",
1650                                       (tt_change + i)->flags & TT_CLIENT_ROAM);
1651                 else
1652                         if (!tt_global_add(bat_priv, orig_node,
1653                                            (tt_change + i)->addr, ttvn, false,
1654                                            (tt_change + i)->flags &
1655                                                         TT_CLIENT_WIFI))
1656                                 /* In case of problem while storing a
1657                                  * global_entry, we stop the updating
1658                                  * procedure without committing the
1659                                  * ttvn change. This will avoid to send
1660                                  * corrupted data on tt_request
1661                                  */
1662                                 return;
1663         }
1664         orig_node->tt_initialised = true;
1665 }
1666
1667 static void tt_fill_gtable(struct bat_priv *bat_priv,
1668                            struct tt_query_packet *tt_response)
1669 {
1670         struct orig_node *orig_node = NULL;
1671
1672         orig_node = orig_hash_find(bat_priv, tt_response->src);
1673         if (!orig_node)
1674                 goto out;
1675
1676         /* Purge the old table first.. */
1677         tt_global_del_orig(bat_priv, orig_node, "Received full table");
1678
1679         _tt_update_changes(bat_priv, orig_node,
1680                            (struct tt_change *)(tt_response + 1),
1681                            tt_response->tt_data, tt_response->ttvn);
1682
1683         spin_lock_bh(&orig_node->tt_buff_lock);
1684         kfree(orig_node->tt_buff);
1685         orig_node->tt_buff_len = 0;
1686         orig_node->tt_buff = NULL;
1687         spin_unlock_bh(&orig_node->tt_buff_lock);
1688
1689         atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1690
1691 out:
1692         if (orig_node)
1693                 orig_node_free_ref(orig_node);
1694 }
1695
1696 static void tt_update_changes(struct bat_priv *bat_priv,
1697                               struct orig_node *orig_node,
1698                               uint16_t tt_num_changes, uint8_t ttvn,
1699                               struct tt_change *tt_change)
1700 {
1701         _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1702                            ttvn);
1703
1704         tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1705                             tt_num_changes);
1706         atomic_set(&orig_node->last_ttvn, ttvn);
1707 }
1708
1709 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1710 {
1711         struct tt_local_entry *tt_local_entry = NULL;
1712         bool ret = false;
1713
1714         tt_local_entry = tt_local_hash_find(bat_priv, addr);
1715         if (!tt_local_entry)
1716                 goto out;
1717         /* Check if the client has been logically deleted (but is kept for
1718          * consistency purpose) */
1719         if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
1720                 goto out;
1721         ret = true;
1722 out:
1723         if (tt_local_entry)
1724                 tt_local_entry_free_ref(tt_local_entry);
1725         return ret;
1726 }
1727
1728 void handle_tt_response(struct bat_priv *bat_priv,
1729                         struct tt_query_packet *tt_response)
1730 {
1731         struct tt_req_node *node, *safe;
1732         struct orig_node *orig_node = NULL;
1733
1734         bat_dbg(DBG_TT, bat_priv,
1735                 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
1736                 tt_response->src, tt_response->ttvn, tt_response->tt_data,
1737                 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1738
1739         /* we should have never asked a backbone gw */
1740         if (bla_is_backbone_gw_orig(bat_priv, tt_response->src))
1741                 goto out;
1742
1743         orig_node = orig_hash_find(bat_priv, tt_response->src);
1744         if (!orig_node)
1745                 goto out;
1746
1747         if (tt_response->flags & TT_FULL_TABLE)
1748                 tt_fill_gtable(bat_priv, tt_response);
1749         else
1750                 tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
1751                                   tt_response->ttvn,
1752                                   (struct tt_change *)(tt_response + 1));
1753
1754         /* Delete the tt_req_node from pending tt_requests list */
1755         spin_lock_bh(&bat_priv->tt_req_list_lock);
1756         list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1757                 if (!compare_eth(node->addr, tt_response->src))
1758                         continue;
1759                 list_del(&node->list);
1760                 kfree(node);
1761         }
1762         spin_unlock_bh(&bat_priv->tt_req_list_lock);
1763
1764         /* Recalculate the CRC for this orig_node and store it */
1765         orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1766         /* Roaming phase is over: tables are in sync again. I can
1767          * unset the flag */
1768         orig_node->tt_poss_change = false;
1769 out:
1770         if (orig_node)
1771                 orig_node_free_ref(orig_node);
1772 }
1773
1774 int tt_init(struct bat_priv *bat_priv)
1775 {
1776         int ret;
1777
1778         ret = tt_local_init(bat_priv);
1779         if (ret < 0)
1780                 return ret;
1781
1782         ret = tt_global_init(bat_priv);
1783         if (ret < 0)
1784                 return ret;
1785
1786         tt_start_timer(bat_priv);
1787
1788         return 1;
1789 }
1790
1791 static void tt_roam_list_free(struct bat_priv *bat_priv)
1792 {
1793         struct tt_roam_node *node, *safe;
1794
1795         spin_lock_bh(&bat_priv->tt_roam_list_lock);
1796
1797         list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1798                 list_del(&node->list);
1799                 kfree(node);
1800         }
1801
1802         spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1803 }
1804
1805 static void tt_roam_purge(struct bat_priv *bat_priv)
1806 {
1807         struct tt_roam_node *node, *safe;
1808
1809         spin_lock_bh(&bat_priv->tt_roam_list_lock);
1810         list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1811                 if (!has_timed_out(node->first_time, ROAMING_MAX_TIME))
1812                         continue;
1813
1814                 list_del(&node->list);
1815                 kfree(node);
1816         }
1817         spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1818 }
1819
1820 /* This function checks whether the client already reached the
1821  * maximum number of possible roaming phases. In this case the ROAMING_ADV
1822  * will not be sent.
1823  *
1824  * returns true if the ROAMING_ADV can be sent, false otherwise */
1825 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1826                                 uint8_t *client)
1827 {
1828         struct tt_roam_node *tt_roam_node;
1829         bool ret = false;
1830
1831         spin_lock_bh(&bat_priv->tt_roam_list_lock);
1832         /* The new tt_req will be issued only if I'm not waiting for a
1833          * reply from the same orig_node yet */
1834         list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1835                 if (!compare_eth(tt_roam_node->addr, client))
1836                         continue;
1837
1838                 if (has_timed_out(tt_roam_node->first_time, ROAMING_MAX_TIME))
1839                         continue;
1840
1841                 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1842                         /* Sorry, you roamed too many times! */
1843                         goto unlock;
1844                 ret = true;
1845                 break;
1846         }
1847
1848         if (!ret) {
1849                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1850                 if (!tt_roam_node)
1851                         goto unlock;
1852
1853                 tt_roam_node->first_time = jiffies;
1854                 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1855                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1856
1857                 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1858                 ret = true;
1859         }
1860
1861 unlock:
1862         spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1863         return ret;
1864 }
1865
1866 static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1867                           struct orig_node *orig_node)
1868 {
1869         struct neigh_node *neigh_node = NULL;
1870         struct sk_buff *skb = NULL;
1871         struct roam_adv_packet *roam_adv_packet;
1872         int ret = 1;
1873         struct hard_iface *primary_if;
1874
1875         /* before going on we have to check whether the client has
1876          * already roamed to us too many times */
1877         if (!tt_check_roam_count(bat_priv, client))
1878                 goto out;
1879
1880         skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1881         if (!skb)
1882                 goto out;
1883
1884         skb_reserve(skb, ETH_HLEN);
1885
1886         roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1887                                         sizeof(struct roam_adv_packet));
1888
1889         roam_adv_packet->header.packet_type = BAT_ROAM_ADV;
1890         roam_adv_packet->header.version = COMPAT_VERSION;
1891         roam_adv_packet->header.ttl = TTL;
1892         primary_if = primary_if_get_selected(bat_priv);
1893         if (!primary_if)
1894                 goto out;
1895         memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1896         hardif_free_ref(primary_if);
1897         memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1898         memcpy(roam_adv_packet->client, client, ETH_ALEN);
1899
1900         neigh_node = orig_node_get_router(orig_node);
1901         if (!neigh_node)
1902                 goto out;
1903
1904         bat_dbg(DBG_TT, bat_priv,
1905                 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1906                 orig_node->orig, client, neigh_node->addr);
1907
1908         batadv_inc_counter(bat_priv, BAT_CNT_TT_ROAM_ADV_TX);
1909
1910         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1911         ret = 0;
1912
1913 out:
1914         if (neigh_node)
1915                 neigh_node_free_ref(neigh_node);
1916         if (ret)
1917                 kfree_skb(skb);
1918         return;
1919 }
1920
1921 static void tt_purge(struct work_struct *work)
1922 {
1923         struct delayed_work *delayed_work =
1924                 container_of(work, struct delayed_work, work);
1925         struct bat_priv *bat_priv =
1926                 container_of(delayed_work, struct bat_priv, tt_work);
1927
1928         tt_local_purge(bat_priv);
1929         tt_global_roam_purge(bat_priv);
1930         tt_req_purge(bat_priv);
1931         tt_roam_purge(bat_priv);
1932
1933         tt_start_timer(bat_priv);
1934 }
1935
1936 void tt_free(struct bat_priv *bat_priv)
1937 {
1938         cancel_delayed_work_sync(&bat_priv->tt_work);
1939
1940         tt_local_table_free(bat_priv);
1941         tt_global_table_free(bat_priv);
1942         tt_req_list_free(bat_priv);
1943         tt_changes_list_free(bat_priv);
1944         tt_roam_list_free(bat_priv);
1945
1946         kfree(bat_priv->tt_buff);
1947 }
1948
1949 /* This function will enable or disable the specified flags for all the entries
1950  * in the given hash table and returns the number of modified entries */
1951 static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags,
1952                              bool enable)
1953 {
1954         uint32_t i;
1955         uint16_t changed_num = 0;
1956         struct hlist_head *head;
1957         struct hlist_node *node;
1958         struct tt_common_entry *tt_common_entry;
1959
1960         if (!hash)
1961                 goto out;
1962
1963         for (i = 0; i < hash->size; i++) {
1964                 head = &hash->table[i];
1965
1966                 rcu_read_lock();
1967                 hlist_for_each_entry_rcu(tt_common_entry, node,
1968                                          head, hash_entry) {
1969                         if (enable) {
1970                                 if ((tt_common_entry->flags & flags) == flags)
1971                                         continue;
1972                                 tt_common_entry->flags |= flags;
1973                         } else {
1974                                 if (!(tt_common_entry->flags & flags))
1975                                         continue;
1976                                 tt_common_entry->flags &= ~flags;
1977                         }
1978                         changed_num++;
1979                 }
1980                 rcu_read_unlock();
1981         }
1982 out:
1983         return changed_num;
1984 }
1985
1986 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1987 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1988 {
1989         struct hashtable_t *hash = bat_priv->tt_local_hash;
1990         struct tt_common_entry *tt_common_entry;
1991         struct tt_local_entry *tt_local_entry;
1992         struct hlist_node *node, *node_tmp;
1993         struct hlist_head *head;
1994         spinlock_t *list_lock; /* protects write access to the hash lists */
1995         uint32_t i;
1996
1997         if (!hash)
1998                 return;
1999
2000         for (i = 0; i < hash->size; i++) {
2001                 head = &hash->table[i];
2002                 list_lock = &hash->list_locks[i];
2003
2004                 spin_lock_bh(list_lock);
2005                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
2006                                           head, hash_entry) {
2007                         if (!(tt_common_entry->flags & TT_CLIENT_PENDING))
2008                                 continue;
2009
2010                         bat_dbg(DBG_TT, bat_priv,
2011                                 "Deleting local tt entry (%pM): pending\n",
2012                                 tt_common_entry->addr);
2013
2014                         atomic_dec(&bat_priv->num_local_tt);
2015                         hlist_del_rcu(node);
2016                         tt_local_entry = container_of(tt_common_entry,
2017                                                       struct tt_local_entry,
2018                                                       common);
2019                         tt_local_entry_free_ref(tt_local_entry);
2020                 }
2021                 spin_unlock_bh(list_lock);
2022         }
2023
2024 }
2025
2026 void tt_commit_changes(struct bat_priv *bat_priv)
2027 {
2028         uint16_t changed_num = tt_set_flags(bat_priv->tt_local_hash,
2029                                             TT_CLIENT_NEW, false);
2030         /* all the reset entries have now to be effectively counted as local
2031          * entries */
2032         atomic_add(changed_num, &bat_priv->num_local_tt);
2033         tt_local_purge_pending_clients(bat_priv);
2034
2035         /* Increment the TTVN only once per OGM interval */
2036         atomic_inc(&bat_priv->ttvn);
2037         bat_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n",
2038                 (uint8_t)atomic_read(&bat_priv->ttvn));
2039         bat_priv->tt_poss_change = false;
2040 }
2041
2042 bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst)
2043 {
2044         struct tt_local_entry *tt_local_entry = NULL;
2045         struct tt_global_entry *tt_global_entry = NULL;
2046         bool ret = true;
2047
2048         if (!atomic_read(&bat_priv->ap_isolation))
2049                 return false;
2050
2051         tt_local_entry = tt_local_hash_find(bat_priv, dst);
2052         if (!tt_local_entry)
2053                 goto out;
2054
2055         tt_global_entry = tt_global_hash_find(bat_priv, src);
2056         if (!tt_global_entry)
2057                 goto out;
2058
2059         if (_is_ap_isolated(tt_local_entry, tt_global_entry))
2060                 goto out;
2061
2062         ret = false;
2063
2064 out:
2065         if (tt_global_entry)
2066                 tt_global_entry_free_ref(tt_global_entry);
2067         if (tt_local_entry)
2068                 tt_local_entry_free_ref(tt_local_entry);
2069         return ret;
2070 }
2071
2072 void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
2073                     const unsigned char *tt_buff, uint8_t tt_num_changes,
2074                     uint8_t ttvn, uint16_t tt_crc)
2075 {
2076         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
2077         bool full_table = true;
2078
2079         /* don't care about a backbone gateways updates. */
2080         if (bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
2081                 return;
2082
2083         /* orig table not initialised AND first diff is in the OGM OR the ttvn
2084          * increased by one -> we can apply the attached changes */
2085         if ((!orig_node->tt_initialised && ttvn == 1) ||
2086             ttvn - orig_ttvn == 1) {
2087                 /* the OGM could not contain the changes due to their size or
2088                  * because they have already been sent TT_OGM_APPEND_MAX times.
2089                  * In this case send a tt request */
2090                 if (!tt_num_changes) {
2091                         full_table = false;
2092                         goto request_table;
2093                 }
2094
2095                 tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn,
2096                                   (struct tt_change *)tt_buff);
2097
2098                 /* Even if we received the precomputed crc with the OGM, we
2099                  * prefer to recompute it to spot any possible inconsistency
2100                  * in the global table */
2101                 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
2102
2103                 /* The ttvn alone is not enough to guarantee consistency
2104                  * because a single value could represent different states
2105                  * (due to the wrap around). Thus a node has to check whether
2106                  * the resulting table (after applying the changes) is still
2107                  * consistent or not. E.g. a node could disconnect while its
2108                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2109                  * checking the CRC value is mandatory to detect the
2110                  * inconsistency */
2111                 if (orig_node->tt_crc != tt_crc)
2112                         goto request_table;
2113
2114                 /* Roaming phase is over: tables are in sync again. I can
2115                  * unset the flag */
2116                 orig_node->tt_poss_change = false;
2117         } else {
2118                 /* if we missed more than one change or our tables are not
2119                  * in sync anymore -> request fresh tt data */
2120
2121                 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
2122                     orig_node->tt_crc != tt_crc) {
2123 request_table:
2124                         bat_dbg(DBG_TT, bat_priv,
2125                                 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2126                                 orig_node->orig, ttvn, orig_ttvn, tt_crc,
2127                                 orig_node->tt_crc, tt_num_changes);
2128                         send_tt_request(bat_priv, orig_node, ttvn, tt_crc,
2129                                         full_table);
2130                         return;
2131                 }
2132         }
2133 }
2134
2135 /* returns true whether we know that the client has moved from its old
2136  * originator to another one. This entry is kept is still kept for consistency
2137  * purposes
2138  */
2139 bool tt_global_client_is_roaming(struct bat_priv *bat_priv, uint8_t *addr)
2140 {
2141         struct tt_global_entry *tt_global_entry;
2142         bool ret = false;
2143
2144         tt_global_entry = tt_global_hash_find(bat_priv, addr);
2145         if (!tt_global_entry)
2146                 goto out;
2147
2148         ret = tt_global_entry->common.flags & TT_CLIENT_ROAM;
2149         tt_global_entry_free_ref(tt_global_entry);
2150 out:
2151         return ret;
2152 }